CN102779628B - transformer - Google Patents

Abstract

The invention relates to a transformer, which comprises a winding frame, an iron core group and a first sleeve. The bobbin comprises a body and a through channel penetrating through the body. The iron core group comprises a first iron core and a second iron core. The first end of the first iron core and the second end of the second iron core are arranged at the position close to the side edge of the winding frame. The first sleeve is arranged in a first gap between the first end and the second end, so that the first end and the second end penetrate through the first sleeve. And the first end is aligned with the second end.

Description

transformer

technical field

The present invention relates to a transformer.

Background technique

With the advancement of technology, there are various types of home appliances. However, the voltage and power required to drive each type of appliance are different. Therefore, various transformers are required to provide different voltages and power. At present, there are two types of transformer products commonly used in the industry. One is a high-frequency transformer, which is generally a switching power supply power conversion transformer. The other is a low-frequency transformer, which is a general silicon steel sheet transformer.

A known transformer includes a bobbin and a core set. The winding frame of the transformer can be used for overlapping winding of the primary winding coil and the secondary winding coil. The iron core group is partly installed on the winding frame, so that the iron core group and the primary winding and secondary winding wound on the winding frame can generate electromagnetic coupling induction, so as to achieve the purpose of voltage conversion.

However, for the known transformer, the manufacturing process of the winding frame may result in a relatively large matching gap during subsequent assembly due to mold opening errors. This phenomenon is not conducive to factory production control, and it is easy to cause assembly skew and other situations, which is not conducive to mass production. In addition, the winding frame must be manually glued and fixed (for example, using AB glue) during assembly, which further reduces the assembly speed. In addition, due to factors such as the mold opening error of the winding frame and the inconsistent assembly of factory workers, in addition to causing the appearance of the core group to be skewed after assembly, the width between the core groups often cannot be adjusted. Consistent, resulting in the dispersion of the inductance data variation of the transformer.

Contents of the invention

In order to solve the problems of the known technology, an object of the present invention is to provide a transformer, which is mainly by inserting a sleeve between the iron core group and the insulating cover and/or between the iron core group and the winding frame, In turn, the problems of mold errors and manual assembly differences can be reduced. The sleeve can not only solve the problem that the assembly skew of the iron core group affects the electrical characteristics, the thickness of the partition in the sleeve can also control the distance between the iron core groups, thereby achieving a fixed inductance value and improving the stability of the electrical characteristics degree of efficacy. In addition, the transformer of the present invention also adds the design of the engaging structure between the winding frame and the insulating cover, thereby eliminating the manual dispensing process in the past, and greatly improving the speed and convenience of factory production and assembly.

According to an embodiment of the present invention, a transformer includes a winding frame, an iron core set and a first sleeve. The bobbin includes a body and a through channel passing through the body. The iron core group is passed through the passage and surrounds the side of the winding frame. The iron core group includes a first iron core and a second iron core. The first iron core includes a first end. The first end is disposed adjacent to the side of the winding frame. The second iron core includes a second end. The second end is disposed adjacent to the side of the winding frame. There is a first gap between the first end and the second end. The first sleeve is disposed in the first gap, so that the first end and the second end pass through the first sleeve, and the first end is aligned with the second end.

According to another embodiment of the present invention, a transformer includes a winding frame, an iron core group, and an insulating cover. The bobbin frame includes a body, a passage through the body and a winding portion surrounding the body. The iron core group is passed through the passage and surrounds the side of the winding frame. The iron core group includes a first iron core and a second iron core. The first iron core includes a first end. The first end is disposed adjacent to the side of the winding frame. The second iron core includes a second end. The second end is disposed adjacent to the side of the winding frame. Wherein, the first end is aligned with the second end, and there is a first gap between the first end and the second end. The insulating cover is arranged between the winding part and the iron core group. The insulation cover further includes a retaining wall, and the retaining wall is located in the first gap.

In the transformer of the present invention, the problems of mold errors and manual assembly differences can be reduced mainly by placing the sleeve between the iron core set and the insulating cover and/or between the iron core set and the winding frame. The sleeve can not only solve the problem that the assembly skew of the iron core group affects the electrical characteristics, the thickness of the partition in the sleeve can also control the distance between the iron core groups, thereby achieving a fixed inductance value and improving the stability of the electrical characteristics degree of efficacy. Furthermore, in order to meet the requirements of different electrical characteristics, it is only necessary to simply modify the thickness of the partition in the sleeve or change the position of the partition in the sleeve, without having to open large and complex molds such as the winding frame and the isolation cover. Greatly reduce the cost of mold opening. In addition, the transformer of the present invention also adds the design of the engaging structure between the winding frame and the insulating cover, thereby eliminating the manual dispensing process in the past, and greatly improving the speed and convenience of factory production and assembly.

Description of drawings

FIG. 1A is a three-dimensional assembly diagram illustrating a transformer according to a first embodiment of the present invention;

FIG. 1B is an exploded perspective view illustrating the transformer in FIG. 1A;

Fig. 2 is a cross-sectional view showing the first iron core, the second iron core, the first sleeve and the second sleeve along line 2-2' in Fig. 1A;

3 is a cross-sectional view illustrating a first iron core, a second iron core, a first sleeve and a second sleeve according to a second embodiment of the present invention;

FIG. 4 is a perspective cross-sectional view illustrating a transformer according to a third embodiment of the present invention.

[Description of main component symbols]

Detailed ways

A number of embodiments of the present invention will be disclosed below with the accompanying drawings. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the sake of simplifying the drawings, some known and commonly used structures and components will be shown in a simple and schematic way in the drawings.

A technical solution of the present invention is a transformer. More specifically, it can reduce the problems of mold errors and manual assembly differences mainly by sheathing the sleeve between the iron core set and the insulating cover and/or between the iron core set and the bobbin. The sleeve can not only solve the problem that the assembly skew of the iron core group affects the electrical characteristics, the thickness of the partition in the sleeve can also control the distance between the iron core groups, thereby achieving a fixed inductance value and improving the stability of the electrical characteristics degree of efficacy. In addition, the transformer of the present invention also adds the design of the engaging structure between the winding frame and the insulating cover, thereby eliminating the manual dispensing process in the past, and greatly improving the speed and convenience of factory production and assembly.

Please refer to FIG. 1A , FIG. 1B and FIG. 2 . FIG. 1A is a three-dimensional assembled view of a transformer 3 according to a first embodiment of the present invention. FIG. 1B is an exploded perspective view illustrating the transformer 3 in FIG. 1A . FIG. 2 is a cross-sectional view of the first iron core 320, the second iron core 322, the first sleeve 34, and the second sleeve 36 along the line 2-2' in FIG. 1A.

As shown in FIG. 1A and FIG. 1B , the transformer 3 of the present invention may be a DC transformer used in a microwave oven, but it is not limited thereto. In other words, the transformer 3 of the present invention can be applied to any electronic product that requires voltage transformation. As long as the assembly efficiency is low due to mold errors and manual assembly differences during the assembly process, the concept of the present invention can be applied to improve the assembly of the transformer 3 speed and convenience.

As shown in FIG. 1A and FIG. 1B , the transformer 3 of this embodiment mainly includes a winding frame 30 , an iron core set 32 , a first sleeve 34 , a second sleeve 36 and an insulating cover 38 . The structural configuration of each component included in the transformer 3 of this embodiment will be described in detail below.

As shown in FIG. 1A and FIG. 1B , in the transformer 3 of this embodiment, the winding frame 30 may include a main body 300 a , a through channel 300 b passing through the main body 300 a and a winding portion 302 . The wire winding portion 302 of the bobbin frame 30 can be used for overlapping the primary winding 302 a and the secondary winding 302 b. The winding part 302 of the winding frame 30 is surrounded by the main body 300 a of the winding frame 30 . The insulating cover 38 is disposed between the winding portion 302 and the first sleeve 34 . The iron core set 32 of the transformer 3 can partially pass through the through channel 300 b of the winding frame 30 and partially surround the side of the winding frame 30 . In this way, the core set 32 and the primary winding 302 a and the secondary winding 302 b wound on the winding part 302 can generate electromagnetic coupling induction, so as to achieve the purpose of voltage conversion.

Furthermore, in the transformer 3 of this embodiment, the iron core set 32 may further include a first iron core 320 and a second iron core 322 . The first iron core 320 may include a first end 320a and a third end 320b. The first end 320 a of the first iron core 320 is disposed adjacent to a side of the winding frame 30 . The third end 320b of the first iron core 320 is passed through the through channel 300b of the bobbin 30 . The second core 322 may include a second end 322a and a fourth end 322b. The second end 322 a of the second iron core 322 is disposed adjacent to a side of the winding frame 30 . The fourth end 322b of the second iron core 322 is passed through the passage 300b of the bobbin 30 . Wherein, there is a first gap 321a between the first end 320a of the first iron core 320 and the second end 322a of the second iron core 322 (please refer to FIG. 2 ). The first sleeve 34 is disposed in the first gap 321a. In other words, the first end 320 a and the second end 322 a pass through the first sleeve 34 , or the first sleeve 34 is sleeved between the first end 320 a of the first iron core 320 and the second end of the second iron core 322 . Between the ends 322a, it is used to align the first end 320a of the first iron core 320 with the second end 322a of the second iron core 322, thereby preventing the first end 320a of the first iron core 320 from contacting the second iron core 322 The second end 322a of the second end 322a is skewed and affects the sensory value.

As shown in FIG. 2, and please refer to FIG. 1A and FIG. 1B at the same time, in the transformer 3 of this embodiment, there is a third end 320b of the first iron core 320 and a fourth end 322b of the second iron core 322. Two gaps 321b. The second sleeve 36 is disposed in the second gap 321b. In other words, the third end 320b and the fourth end 322b pass through the second sleeve 36 , or the second sleeve 36 is sleeved between the third end 320b of the first iron core 320 and the fourth end of the second iron core 322 . Between the ends 322b, in order to align the third end 320b of the first iron core 320 with the fourth end 322b of the second iron core 322, thereby preventing the third end 320b of the first iron core 320 from contacting the second iron core 322 The inclination of the fourth end 322b affects the sensory value.

As shown in FIG. 2 , in the transformer 3 of this embodiment, the first sleeve 34 may further include a separator 340 . The partition 340 of the first sleeve 34 can separate the first accommodating groove 342 and the second accommodating groove 344 in the first sleeve 34 . Thereby, the first end 320 a of the first iron core 320 can pass through the first accommodating groove 342 of the first sleeve 34 and abut against the separator 340 . Likewise, the second end 322a of the second iron core 322 can pass through the second receiving groove 344 of the first sleeve 34 and abut against the partition 340 .

Further, in order to make the first end 320a of the first iron core 320 more accurately aligned with the second end 322a of the second iron core 322, the structural shape of the first accommodating groove 342 of the first sleeve 34 can be exactly It matches with the first end 320 a of the first iron core 320 , and the structural shape of the second accommodating groove 344 of the first sleeve 34 can exactly match with the second end 322 a of the second iron core 322 . Furthermore, since the first end 320a of the first iron core 320 abuts against the partition 340 of the first sleeve 34, and the second end 322a of the second iron core 322 also abuts against the partition 340 of the first sleeve 34 , so the distance between the first end 320a of the first iron core 320 and the second end 322a of the second iron core 322 can be controlled by the thickness of the partition 340 of the first sleeve 34 . In other words, in order to make the iron core group 32 achieve the purpose of matching different electrical characteristics, the thickness of the partition plate 340 in the first sleeve 34 can be changed when the first sleeve 34 is manufactured, so that the thickness of the first iron core 320 The distance between the first end 320a and the second end 322a of the second iron core 322 is adjusted to a desired distance. It can be seen that the first sleeve 34 can solve the problem that the first end 320a of the first iron core 320 and the second end 322a of the second iron core 322 are skewed and offset to affect the electrical characteristics, the first sleeve 34 The thickness of the separator 340 can also control the distance between the first end 320a of the first iron core 320 and the second end 322a of the second iron core 322, thereby achieving the effect of fixing the inductance value and improving the stability of electrical characteristics . Moreover, in order to meet the requirements of different electrical characteristics, the position of the partition plate 340 in the first sleeve 34 can also be simply modified, without additionally opening large and complicated molds such as the winding frame 30 and the insulating cover 38, so the present invention The mold opening cost of the transformer 3 will not increase.

Also shown in FIG. 2 , in the transformer 3 of this embodiment, the second sleeve 36 may further include a separator 360 . The partition 360 of the second sleeve 36 can separate the second sleeve 36 into a third accommodating groove 362 and a fourth accommodating groove 364 . Thereby, the third end 320b of the first iron core 320 can pass through the third accommodating groove 362 of the second sleeve 36 and abut against the partition 360 . Likewise, the fourth end 322 b of the second iron core 322 can pass through the fourth receiving groove 364 of the second sleeve 36 and abut against the partition 360 .

Further, in order to make the third end 320b of the first iron core 320 more accurately aligned with the fourth end 322b of the second iron core 322, the structural shape of the third accommodating groove 362 of the second sleeve 36 can be exactly It matches with the third end 320b of the first iron core 320 , and the structural shape of the fourth accommodating groove 364 of the second sleeve 36 can exactly match with the fourth end 322b of the second iron core 322 . Furthermore, since the third end 320b of the first iron core 320 abuts against the partition 360 of the second sleeve 36 , and the fourth end 322b of the second iron core 322 also abuts against the partition 360 of the second sleeve 36 , so the distance between the third end 320b of the first iron core 320 and the fourth end 322b of the second iron core 322 can be controlled by the thickness of the partition 360 of the second sleeve 36 . In other words, in order to make the iron core group 32 achieve the purpose of matching different electrical characteristics, it is also possible to make the first iron core The distance between the third end 320b of the 320 and the fourth end 322b of the second iron core 322 is adjusted to a desired distance. Similarly, the second sleeve 36 can solve the problem that the third end 320b of the first iron core 320 and the fourth end 322b of the second iron core 322 are skewed and offset to affect the electrical characteristics. The thickness of the separator 360 can also control the distance between the third end 320b of the first iron core 320 and the fourth end 322b of the second iron core 322, thereby achieving the effect of fixing the inductance value and improving the stability of electrical characteristics. Moreover, in order to meet the requirements of different electrical characteristics, the position of the partition plate 360 in the second sleeve 36 can also be simply modified.

Please refer to Figure 3. FIG. 3 is a cross-sectional view illustrating the first iron core 520 , the second iron core 522 , the first sleeve 34 and the second sleeve 36 according to the second embodiment of the present invention.

As shown in FIG. 3 , in the transformer 3 of the second embodiment, the first iron core 520 may include a first end 520 a and a third end 520 b. The second core 522 may include a second end 522a and a fourth end 522b. The first sleeve 34 is sleeved between the first end 520 a of the first iron core 520 and the second end 522 a of the second iron core 522 . Thereby, the first end 520 a of the first iron core 520 can pass through the first accommodating groove 342 of the first sleeve 34 and abut against the separator 340 . Likewise, the second end 522 a of the second iron core 522 can pass through the second receiving groove 344 of the first sleeve 34 and abut against the partition 340 . In addition, the second sleeve 36 is sleeved between the third end 520 b of the first iron core 520 and the fourth end 522 b of the second iron core 522 . Thereby, the third end 520 b of the first iron core 520 can pass through the third accommodating groove 362 of the second sleeve 36 and abut against the separator 360 . Likewise, the fourth end 522 b of the second iron core 522 can pass through the fourth receiving groove 364 of the second sleeve 36 and abut against the partition 360 .

It should be noted here that the difference between the first iron core 520 and the second iron core 522 in this embodiment and the first iron core 320 and the second iron core 322 in FIG. The iron core 520 and the second iron core 522 have different lengths. In practical applications, in order to match different electrical requirements, the first iron core 520 and the second iron core 522 with different lengths can be used, thereby changing the positions of the first gap 521a and the second gap 521b. At this time, complex molds such as the bobbin 30 , the first sleeve 34 and the second sleeve 36 can continue to be used without additional mold opening, thereby reducing the cost of mold development.

As shown in FIG. 1A and FIG. 1B, in the transformer 3 of this embodiment, the first sleeve 34 may further include a guide concave wall 346 for the first end 320a of the first iron core 320 and the second iron core 320. When the second end 322a of the core 322 is sheathed in the first sleeve 34 , it guides the first end 320a of the first iron core 320 and the second end 322a of the second iron core 322 . In contrast, the first end 320a of the first iron core 320 may include a guide groove 320c corresponding to the guide concave wall 346 of the first sleeve 34, and the second end 322a of the second iron core 322 may include a corresponding guide groove 320c. The guide groove 322c of the guide concave wall 346 of the first sleeve 34 . Through the guide concave wall 346 of the first sleeve 34 slidably engaging with the guide groove 320c of the first iron core 320, the first end 320a of the first iron core 320 can be sleeved on the first sleeve. The period in the barrel 34 is guided by the guide concave wall 346 of the first sleeve 34 . Similarly, the second end 322a of the second iron core 322 can be sheathed on the guide groove 322c of the second iron core 322 through the slidingly engaging the guide concave wall 346 of the first sleeve 34 . The period in the first sleeve 34 is guided by the guide concave wall 346 of the first sleeve 34 .

Also shown in FIG. 1A and FIG. 1B , in the transformer 3 of this embodiment, the second sleeve 36 may further include a guide concave wall 366 for the third end 320b of the first iron core 320 and the third end 320b of the first core 320. When the fourth end 322b of the second iron core 322 is sheathed in the second sleeve 36 , it guides the third end 320b of the first iron core 320 and the fourth end 322b of the second iron core 322 . In contrast, the third end 320b of the first iron core 320 may include a guiding groove 320d corresponding to the guiding concave wall 366 of the second sleeve 36, and the second end 322a of the second iron core 322 may include a corresponding guiding groove 320d. The guide groove 322d of the guide concave wall 366 of the second sleeve 36 . Through the guide concave wall 366 of the second sleeve 36 slidably engaging with the guide groove 320d of the first iron core 320, the third end 320b of the first iron core 320 can be sleeved on the first sleeve. The period in the barrel 34 is guided by the guide concave wall 366 of the first sleeve 34 . Similarly, the fourth end 322b of the second iron core 322 can be sleeved on the second iron core 322 through the slidingly engaging the guiding concave wall 366 of the second sleeve 36 with the guiding groove 322d of the second iron core 322. The period in the first sleeve 34 is guided by the guide concave wall 366 of the first sleeve 34 .

In addition, in the transformer 3 of this embodiment, in order to prevent the second sleeve 36 from freely entering the through passage 300b of the bobbin 30 when the second sleeve 36 is inserted into the through passage 300b of the bobbin 30 It is not conducive to the sheathing of the third end 320b of the first iron core 320 and the fourth end 322b of the second iron core 322. The main body 300a of the bobbin 30 may further include guide grooves corresponding to the through channel 300b. Rib 300c of wall 366 . Therefore, the second sleeve 36 can be sleeved on the bobbin 30 of the bobbin 30 through the structural shape fit of the protruding strip 300c of the bobbin 30 to slidably engage with the guide concave wall 366 of the second sleeve 36 . The period passing through the channel 300b is guided by the protruding strip 300c of the bobbin 30 .

In one embodiment, the transformer 3 of the present invention can also omit the above-mentioned second sleeve 36 . As long as the structural shape of the through channel 300b of the winding frame 30 can exactly match the third end 320b of the first iron core 320 and the fourth end 322b of the second iron core 322 respectively, and the structure of the protrusion 300c of the winding frame 30 The shape fits are enough to slidably engage with the third end 320b of the first iron core 320 and the fourth end 322b of the second iron core 322 respectively.

As shown in FIG. 1A and FIG. 1B , in the transformer 3 of this embodiment, in order to omit the manual dispensing process that was necessary to fix the winding frame 30 and the insulating cover 38 in the past to improve the efficiency of factory production and assembly, For speed and convenience, the winding frame 30 may further include a first engaging structure 304 . The first engaging structure 304 is disposed on the main body 300a of the bobbin 30, and is interposed between the two ends of the through channel 300b and the winding part 302, and is used for connecting the insulating cover 38 with the two ends of the through channel 300b. The insulating covers 38 are engaged with each other. Correspondingly, the insulating cover 38 may further include a second engaging structure 380 . The second engaging structure 380 of the insulating cover 38 can be used to engage with the first engaging structure 304 of the bobbin 30 through the second engaging structure 380 when the insulating cover 38 is connected to both ends of the through passage 300b. And be mutually fixed with bobbin frame 30. Of course, the structural shapes of the first engaging structure 304 of the bobbin 30 and the second engaging structure 380 of the insulating cover 38 can also be replaced (for example, the first engaging structure 304 is a groove and the second engaging structure 380 is a protruding tenon; or the first engaging structure 304 is a protruding tenon and the second engaging structure 380 is a groove), as long as the first engaging structure 304 of the bobbin 30 and the insulating cover 38 can be achieved The purpose of firmly engaging the second engaging structure 380 with each other is sufficient. In addition, the number of the first engaging structure 304 of the bobbin 30 and the number of the second engaging structure 380 of the insulating cover 38 are corresponding, and can be elastically changed according to requirements.

Please refer to Figure 4. FIG. 4 is a perspective cross-sectional view illustrating a transformer 5 according to a third embodiment of the present invention.

As shown in Figure 4, in the transformer 5 of this embodiment, if the second sleeve 36 for the third end 320b of the first iron core 320 and the fourth end 322b of the second iron core 322 is omitted, then To keep a predetermined gap (that is, the second gap 321b) between the third end 320b of the first iron core 320 and the fourth end 322b of the second iron core 322 and align with each other, the winding frame can also be 50 further includes a baffle 506 in the through channel 500b. Thereby, the third end 320b of the first iron core 320 and the fourth end 322b of the second iron core 322 respectively pass through the two ends of the through passage 500b into the through passage 500b and abut against the baffle plate 506 . Similarly, if the first sleeve 34 for the first end 320a of the first iron core 320 and the second end 322a of the second iron core 322 is omitted, if the first end of the first iron core 320 is to A predetermined gap (ie, the first gap 321 a ) remains between the 320 a and the second end 322 a of the second iron core 322 and are aligned with each other, so that the insulating cover 58 further includes a retaining wall 582 . The insulating cover 58 is disposed between the winding portion 502 and the first iron core 320 and the second iron core 322 . Thereby, the first end 320 a of the first iron core 320 and the second end 322 a of the second iron core 322 can abut against the retaining wall 582 respectively.

From the above detailed description of the specific embodiments of the present invention, it can be clearly seen that the transformer of the present invention is mainly formed by placing the sleeve between the iron core group and the insulating cover and/or the iron core group and the winding wire. Between the racks, the problems of mold errors and manual assembly differences can be reduced. The sleeve can not only solve the problem that the assembly skew of the iron core group affects the electrical characteristics, the thickness of the partition in the sleeve can also control the distance between the iron core groups, thereby achieving a fixed inductance value and improving the stability of the electrical characteristics degree of efficacy. Furthermore, in order to meet the requirements of different electrical characteristics, it is only necessary to simply modify the thickness of the partition in the sleeve or change the position of the partition in the sleeve, without having to open large and complex molds such as the winding frame and the isolation cover. Greatly reduce the cost of mold opening. In addition, the transformer of the present invention also adds the design of the engaging structure between the winding frame and the insulating cover, thereby eliminating the manual dispensing process in the past, and greatly improving the speed and convenience of factory production and assembly.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Any skilled person can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall prevail as defined by the appended claims.

Claims (9)

1. A transformer, characterized in that, comprising: A winding frame, comprising a body and a through channel passing through the body; An iron core set is passed through the passage and surrounds the side of the bobbin frame, the iron core set includes: a first core comprising a first end disposed adjacent to a side of the bobbin, the first core further comprising a third end; and a second core including a second end disposed adjacent to a side of the bobbin, wherein the first end is aligned with the second end, and the first end is aligned with the second end There is a first gap between the ends, and the second core further includes a fourth end; A first sleeve is disposed in the first gap, and the first end and the second end pass through the first sleeve; and A second sleeve is passed through the through channel, the second sleeve further includes a guide concave wall, the third end and the fourth end respectively include the guide corresponding to the second sleeve A guiding groove of the concave wall. 2. The transformer according to claim 1, characterized in that, the first sleeve further comprises a partition, so that a first accommodating groove and a second accommodating groove are separated in the first sleeve, The first end is passed through the first accommodating groove and abuts against the partition, and the second end is passed through the second accommodating groove and abuts against the partition. 3. The transformer according to claim 1, wherein the first sleeve further comprises a guide concave wall, and the first end and the second end respectively comprise the guide corresponding to the first sleeve. A guide groove for guiding the concave wall. 4. The transformer according to claim 1, characterized in that, the transformer further comprises an insulating cover, wherein the winding frame further comprises a winding portion, and the winding portion surrounds the body of the winding frame , the insulating cover is disposed between the winding portion and the first sleeve. 5. The transformer according to claim 4, wherein the winding frame further comprises at least one first engaging structure disposed on the body of the winding frame, and the insulating cover further comprises at least one second engaging structure structure, the insulation cover is mutually fixed with the winding frame through the mutual engagement of the second engaging structure and the first engaging structure. 6. The transformer according to claim 1, wherein the third end and the fourth end are passed through the second sleeve in the through channel, and the third end is aligned with the fourth end , and there is a second gap between the third end and the fourth end. 7. The transformer according to claim 6, characterized in that, the second sleeve further comprises a partition, so that a third accommodating groove and a fourth accommodating groove are separated in the second sleeve, The third end passes through the third accommodating groove and abuts against the partition, and the fourth end passes through the fourth accommodating groove and abuts against the partition. 8 . The transformer according to claim 6 , wherein the body further comprises a protrusion corresponding to the guiding concave wall in the through passage. 9. The transformer according to claim 1, wherein the bobbin further comprises a baffle in the passage, the first core further comprises a third end, the second core further comprises a The fourth end, the third end and the fourth end respectively pass through the two ends of the through channel into the through channel and abut against the baffle plate, the third end is aligned with the fourth end, and the first There is a second gap between the third end and the fourth end.