Combined mutual inductor

Abstract

The utility model relates to a combined type mutual inductor, the combined type mutual inductor comprises a shell, an insulating cover, a first coil, a second coil, a conductor and an insulating part, the shell comprises a first shell and a second shell stacked above the first shell, and the first shell is provided with two first jacks and two second jacks. The insulating cover is arranged in the first shell. The first coil is arranged in the insulating cover. The second coil is arranged in the second shell. The conductor is of a U-shaped bending structure and comprises a first conductor and a second conductor, two pins of the first conductor are inserted into the first jack and are respectively arranged on the inner side and the outer side of the first coil, and two pins of the second conductor are inserted into the second jack and are respectively arranged on the inner side and the outer side of the first coil and the second coil; and the transition sections of the first conductor and the second conductor are arranged in the second shell. The insulating part is arranged in the second shell, a first insulating part of the insulating part is arranged between the first conductor and the second coil, and a second insulating part of the insulating part is arranged between the second conductor and the second coil.

Description

Technical Field

[0001] The present disclosure relates to the technical field of mutual inductors, and in particular to a combined mutual inductor. Background Art

[0002] A transformer is a device that can convert voltage or current in proportion. It can convert high input voltage into low voltage in proportion, or convert high current into low current in proportion and output it, thus realizing the measurement of high voltage or high current. When measuring high current, it is also necessary to detect whether there is leakage current. Therefore, there are transformers on the market that integrate current transformers and leakage current transformers.

[0003] A Chinese utility model patent with publication number CN211788602U discloses a multifunctional transformer, which superimposes and fixes a current transformer and a leakage current transformer together, thereby saving space while implementing its own functions, thereby optimizing the product.

[0004] However, the first U-shaped conductor is fixed to the current transformer housing by plugging, and the part between the two bends of the first U-shaped conductor is exposed outside the current transformer housing, which is prone to leakage, making the safety of the multifunctional combined transformer poor, and the part exposed outside the current transformer housing is easily disturbed by the external magnetic field, affecting the electromagnetic induction process inside the current transformer, thereby affecting the measurement accuracy. On the other hand, after the transformer wire package is inserted into the transformer housing, the transformer wire package needs to be insulated and sealed by pouring epoxy resin. The epoxy resin bonds the transformer wire package and the transformer housing to form a whole. Once the transformer housing or one of the transformer wire packages that are combined with each other is damaged, the whole needs to be replaced, which increases the maintenance cost. Utility Model Content

[0005] The purpose of the present disclosure is to provide a combined mutual inductor to solve the above technical problems.

[0006] In order to solve the above technical problems, the present disclosure adopts the following technical solutions.

[0007] The present invention provides a combined mutual inductor, which comprises: a housing, comprising a first housing and a second housing stacked on the first housing, the bottom of the first housing being open, and the first housing being provided with two first plug holes and two second plug holes; an insulating cover being arranged in the first housing; a first coil being arranged in the insulating cover; a second coil being arranged in the second housing; a conductor having a U-shaped bending structure, so that the conductor has two pins and a transition section connecting the two pins, the conductor comprising a first conductor and a second conductor, one of the pins of the first conductor being inserted in one of the first plug holes and arranged on the inner side of the first coil, and the other pin of the first conductor being inserted in Another of the first jacks is arranged on the outside of the first coil, one of the pins of the second conductor is inserted into one of the second jacks and is arranged on the inside of the first coil and the second coil, another of the pins of the first conductor is inserted into another of the second jacks and is arranged on the outside of the first coil and the second coil, and the transition section of the first conductor and the transition section of the second conductor are both arranged in the second shell; an insulating member is arranged in the second shell, the insulating member includes a first insulating portion and a second insulating portion connected to each other, the first insulating portion is arranged between the first conductor and the second coil, and the second insulating portion is arranged between the second conductor and the second coil.

[0008] In some embodiments of the present application, the second insulating portion has a U-shaped bending structure, so that the second insulating portion has two first insulating strips and a second insulating strip connecting the two first insulating strips; the two first insulating strips are respectively arranged between the two pins of the second conductor and the second coil; the second insulating strip is arranged between the transition section of the second conductor and the second coil; the first insulating strip is perpendicular to the first insulating portion, and the second insulating strip is parallel to the first insulating portion.

[0009] In some embodiments of the present application, the insulating member also includes a third insulating portion; the third insulating portion is erected on the first insulating portion, and one of the first insulating strips is connected to the third insulating portion; the third insulating portion extends from an end of the first insulating portion close to the first insulating strip to an end of the first insulating portion away from the first insulating strip.

[0010] In some embodiments of the present application, the width of the first insulating portion gradually increases from an end close to the first insulating strip to an end away from the first insulating strip; and the transition section of the first conductor is provided at an end of the first insulating portion away from the first insulating strip.

[0011] In some embodiments of the present application, the second shell includes a second outer shell, a second inner shell and a second connecting piece connecting the second outer shell and the second inner shell; the second outer shell and the second inner shell are both annular, and the second outer shell is arranged outside the second inner shell; the inner wall of the second outer shell, the outer wall of the second inner shell and the inner wall of the second connecting piece are combined to form a second accommodating groove; the second coil and the insulating member are both arranged in the second accommodating groove.

[0012] In some embodiments of the present application, a first positioning groove is recessed on the inner wall of the second outer shell; a second positioning groove is recessed on the outer wall of the second inner shell; a third positioning groove is recessed on the inner wall of the second connecting piece; the two pins of the second conductor are respectively arranged in the first positioning groove and the second positioning groove, and the transition section of the second conductor is arranged in the third positioning groove.

[0013] In some embodiments of the present application, the first housing includes

[0014] A first outer shell, a first inner shell and a first connecting piece connecting the first outer shell and the first inner shell; the first outer shell and the first inner shell are both annular, and the first outer shell is arranged outside the first inner shell; the inner wall of the first outer shell, the outer wall of the first inner shell and the inner wall of the first connecting piece are combined to form a first accommodating groove; the first coil and the insulating cover are both arranged in the first accommodating groove; the two first jacks are respectively located outside the first outer shell and inside the first inner shell, and the two second jacks are respectively located outside the first outer shell and inside the first inner shell; a first jack groove is provided on the outer wall of the first connecting piece, and the first jack groove is connected to the two first jacks.

[0015] Some embodiments of the present application further include a pin group, which includes a first pin group and a second pin group; the first pin group is disposed on the first shell and connected to the first coil; the second pin group is disposed on the second shell and connected to the second coil.

[0016] In some embodiments of the present application, the first pin group includes a first pin holder and two first pins; the second pin group includes a second pin holder and two second pins; the first shell is provided with a first pin slot; the second shell is provided with a second pin slot; the first pin holder is installed in the first pin slot, and the two first pins are connected to the first coil; the second pin holder is installed in the second pin slot, and the two second pins are connected to the second coil.

[0017] In some embodiments of the present application, the first pin groups are provided in multiple groups; the first pin slots are provided in multiple groups at intervals; and the multiple groups of the first pin groups are respectively installed in the multiple first pin slots.

[0018] It can be seen from the above technical solutions that the embodiments of the present disclosure have at least the following advantages and positive effects:

[0019] In the combined mutual inductor of the disclosed embodiment, the installation steps of the combined mutual inductor are as follows: install the insulating cover with the first coil inside into the first shell, and then insert the two pins of the first conductor into the two first jacks, at which time the transition section of the first conductor is located at the top of the first shell and exposed outside the first shell; combine the insulating part and the second coil and place them on the top of the first shell, ensure that the first insulating part and the transition section of the first conductor are opposite, and then insert the two pins of the second conductor into the two second jacks, cooperate with the insulating part, and ensure that the second insulating part can form an effective barrier between the second conductor and the second coil, and finally superimpose the second shell on the first shell. Since the transition sections of the first conductor and the second conductor are both located in the second shell, the leakage phenomenon caused by the exposure of the transition section of the conductor can be effectively avoided, the safety of the mutual inductor is improved, and the interference of the external magnetic field can be reduced, and the measurement accuracy is improved. On the other hand, the insulating cover is used to shield the electromagnetic interference of the external environment on the first coil, the first insulating part of the insulating member is used to isolate the second conductor and the second coil, and avoid the direct flow of current between the second conductor and the second coil, thereby reducing potential electrical hazards, and the second insulating part is used to isolate the first conductor and the second coil to avoid signal crosstalk between adjacent modules. Through the provision of the insulating cover and the insulating member, on the basis of ensuring the insulation performance of the combined mutual inductor, since the shell and the coil do not need to be bonded into a whole, when one of the shell or the coil is damaged, it can be replaced separately, reducing the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various objects, features and advantages of the present disclosure will become more apparent by considering the following detailed description of preferred embodiments of the present disclosure in conjunction with the accompanying drawings. The accompanying drawings are merely exemplary illustrations of the present disclosure and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts.

[0021] in:

[0022] Figure 1 It is a structural schematic diagram of a combined mutual inductor according to an embodiment of the present disclosure.

[0023] Figure 2 yes Figure 1 Decomposition structure diagram of .

[0024] Figure 3 yes Figure 1 A cross-sectional view of a position.

[0025] Figure 4 yes Figure 1 A cross-sectional view of another position of .

[0026] Figure 5 yes Figure 1 Schematic diagram of the structure of the second shell.

[0027] Figure 6 yes Figure 1 Schematic diagram of the first shell structure.

[0028] Figure 7 yes Figure 7 Schematic diagram of the structure from another perspective.

[0029] Figure 8 yes Figure 2 Schematic diagram of the structure of the insulating part.

[0030] Fig. 9 yes Figure 1 Schematic diagram of the structure of the first pin group.

[0031] Fig.10 yes Figure 2 Schematic diagram of the structure of the second conductor.

[0032] The accompanying drawings are marked as follows: 1. first shell; 11. first outer shell; 12. first inner shell; 13. first connecting piece; 131. first jack; 132. second jack; 133. first jack slot; 14. first pin slot; 2. second shell; 21. second outer shell; 211. first positioning slot; 22. second inner shell; 221. second positioning slot; 23. second connecting piece; 231. third positioning slot; 24. second pin slot; 3. insulating cover; 4. second coil; 5. first conductor; 6. second conductor; 7. insulating member; 71. first insulating portion; 711. first insulating strip; 712. second insulating strip; 72. second insulating portion; 73. third insulating portion; 8. first pin group; 81. first pin seat; 82. first pin; 9. second pin group. DETAILED DESCRIPTION

[0033] Although the present disclosure can be easily embodied in different forms of embodiments, only some of the specific embodiments are shown in the drawings and will be described in detail in this specification. It should be understood that this description should be regarded as an exemplary description of the principles of the present disclosure and is not intended to limit the present disclosure to that described herein.

[0034] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present disclosure, rather than implying that each embodiment of the present disclosure must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0035] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the present disclosure are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indications of these directions also change accordingly.

[0036] It should be noted that the coils involved in the following embodiments all include an annular iron core and a winding wound around the annular iron core, wherein the number of turns of the winding is greater than 2.

[0037] See also Figures 1 to 10 The combined mutual inductor comprises a housing, an insulating cover 3, a first coil (the first coil is not shown in the drawings), a second coil 4, a conductor and an insulating member 7. The housing comprises a first housing 1 and a second housing 2 stacked on the first housing 1. The bottom of the first housing 1 is open, and the first housing 1 is provided with two first jacks 131 and two second jacks 132. The insulating cover 3 is arranged in the first housing 1. The first coil is arranged in the insulating cover 3. The second coil 4 is arranged in the second housing 2. The conductor is in a U-shaped bending structure, so that the conductor has two pins and a transition section connecting the two pins. The conductor includes a first conductor 5 and a second conductor 6. One pin of the first conductor 5 is inserted into a first plug hole 131 and is arranged on the inner side of the first coil. The other pin of the first conductor 5 is inserted into another first plug hole 131 and is arranged on the outer side of the first coil. One pin of the second conductor 6 is inserted into a second plug hole 132 and is arranged on the inner side of the first coil and the second coil 4. The other pin of the first conductor 5 is inserted into another second plug hole 132 and is arranged on the outer side of the first coil and the second coil 4. The transition section of the first conductor 5 and the transition section of the second conductor 6 are both arranged in the second housing 2. The insulating member 7 is arranged in the second housing 2. The insulating member 7 includes a first insulating portion 71 and a second insulating portion 72 connected to each other. The first insulating portion 71 is arranged between the first conductor 5 and the second coil 4, and the second insulating portion 72 is arranged between the second conductor 6 and the second coil 4.

[0038] In the combined mutual inductor of the disclosed embodiment, the working principle is as follows: according to the principle of electromagnetic induction, when alternating current is passed through the first conductor 5 and the second conductor 6, induced current signals will be generated on the first coil and the second coil 4. First, the current to be detected is passed through one pin of the second conductor 6, and the current flowing out of the other pin of the second conductor 6 is connected to the first conductor 5, and the current flows in the first conductor 5 and the second conductor 6 in opposite directions. By detecting the current signal flowing out of the second coil 4, the measurement of the current to be detected can be achieved. By detecting whether there is a current signal flowing out of the first coil, it can be determined whether the current to be detected generates leakage current, so that the combined mutual inductor can be used to complete the detection of large current and leakage current. The combined mutual inductor can also perform DC leakage detection through the alternating signal generated by the external circuit, which will not be further elaborated here.

[0039] The installation steps of the combined mutual inductor are as follows: install the insulating cover 3 with the first coil inside into the first shell 1, and then insert the two pins of the first conductor 5 into the two first jacks 131, at which time the transition section of the first conductor 5 is located at the top of the first shell 1 and exposed outside the first shell 1; combine the insulating member 7 and the second coil 4 and place them on the top of the first shell 1, ensuring that the first insulating portion 71 is opposite to the transition section of the first conductor 5, and then insert the two pins of the second conductor 6 into the two second jacks 132, cooperate with the insulating member 7, and ensure that the second insulating portion 72 can form an effective barrier between the second conductor 6 and the second coil 4, and finally superimpose the second shell 2 on the first shell 1. Since the transition sections of the first conductor 5 and the second conductor 6 are both located in the second shell 2, the leakage phenomenon caused by the exposure of the transition section of the conductor can be effectively avoided, the safety of the mutual inductor is improved, and the interference of the external magnetic field can be reduced, and the measurement accuracy is improved. On the other hand, the insulating cover 3 is used to shield the electromagnetic interference of the external environment on the first coil, the first insulating part 71 of the insulating member 7 is used to isolate the second conductor 6 and the second coil 4, to avoid the direct flow of current between the second conductor 6 and the second coil 4, thereby reducing potential electrical hazards, and the second insulating part 72 is used to isolate the first conductor 5 and the second coil 4, to avoid signal crosstalk between adjacent modules. Through the arrangement of the insulating cover 3 and the insulating member 7, on the basis of ensuring the insulation performance of the combined mutual inductor, since the shell and the coil do not need to be bonded into a whole, when one of the shell or the coil is damaged, it can be replaced separately, reducing the maintenance cost.

[0040] In this embodiment, the first conductor 5 and the second conductor 6 have the same structure, the second pin group 9 and the first pin group 8 have the same structure, and the first coil and the second coil 4 have the same structure.

[0041] The second insulating portion 72 is in a U-shaped bending structure, so that the second insulating portion 72 has two first insulating strips 711 and a second insulating strip 712 connecting the two first insulating strips 711. The two first insulating strips 711 are respectively arranged between the two pins of the second conductor 6 and the second coil 4. The second insulating strip 712 is arranged between the transition section of the second conductor 6 and the second coil 4. The first insulating strip 711 is perpendicular to the first insulating portion 71, and the second insulating strip 712 is parallel to the first insulating portion 71. The second insulating portion 72 is adapted to the shape of the second conductor 6, and can effectively isolate the second conductor 6 and the second coil 4. The first insulating portion 71 and the second insulating portion 72 are enclosed to form a non-closed frame structure, so that the overall structure of the insulating member 7 is more stable.

[0042] The insulating member 7 also includes a third insulating portion 73. The third insulating portion 73 stands upright on the first insulating portion 71, and one of the first insulating strips 711 is connected to the third insulating portion 73. The third insulating portion 73 extends from an end of the first insulating portion 71 close to the first insulating strip 711 to an end of the first insulating portion 71 away from the first insulating strip 711. The first insulating portion 71 and the second insulating portion 72 are connected through the third insulating portion 73. On the one hand, the third insulating portion 73 increases the connection portion of the first insulating portion 71 and the second insulating portion 72, making the connection between the first insulating portion 71 and the second insulating portion 72 more stable. On the other hand, the first insulating portion 71 can achieve shielding between the second shell 2 and the second coil 4, thereby enhancing the effect of shielding interference from the external environment.

[0043] The width of the first insulating portion 71 gradually increases from the end close to the first insulating strip 711 to the end away from the first insulating strip 711. The transition section of the first conductor 5 is arranged at the end of the first insulating portion 71 away from the first insulating strip 711. The wide portion of the first insulating portion 71 is used to shield the transition section of the first conductor 5. The gradually changing width can provide a clearance opening for the installation of the second coil 4, facilitate the installation of the second coil 4 and the insulating member 7 together, and can reduce unnecessary material loss.

[0044] See also Figure 6 The second housing 2 includes a second outer shell 21, a second inner shell 22 and a second connecting piece 23 connecting the second outer shell 21 and the second inner shell 22. The second outer shell 21 and the second inner shell 22 are both annular, and the second outer shell 21 is arranged outside the second inner shell 22. The inner wall of the second outer shell 21, the outer wall of the second inner shell 22 and the inner wall of the second connecting piece 23 are enclosed to form a second receiving groove. The second coil 4 and the insulating member 7 are both arranged in the second receiving groove. The annular second receiving groove is adapted to the shape of the second coil 4, which is convenient for the correct installation of the second coil 4, and the outer wall of the first outer shell 11, the inner wall of the second inner shell 22 and the outer wall of the second connecting piece 23 can effectively shield the second coil 4, thereby improving the anti-external interference performance of the combined mutual inductor.

[0045] See also Figure 6 A first positioning groove 211 is recessed on the inner wall of the second outer shell 21. A second positioning groove 221 is recessed on the outer wall of the second inner shell 22. A third positioning groove 231 is recessed on the inner wall of the second connecting piece 23. The two pins of the second conductor 6 are respectively disposed in the first positioning groove 211 and the second positioning groove 221, and the transition section of the second conductor 6 is disposed in the third positioning groove 231. The first positioning groove 211, the second positioning groove 221 and the third positioning groove 231 realize the positioning of the second conductor 6 in the second shell 2, making the overall structure more stable.

[0046] See also Figure 6 and Figure 7 The first shell 1 includes a first outer shell 11, a first inner shell 12 and a first connecting piece 13 connecting the first outer shell 11 and the first inner shell 12. The first outer shell 11 and the first inner shell 12 are both annular, and the first outer shell 11 is arranged outside the first inner shell 12. The inner wall of the first outer shell 11, the outer wall of the first inner shell 12 and the inner wall of the first connecting piece 13 are surrounded to form a first receiving groove. The first coil and the insulating cover 3 are both arranged in the first receiving groove. The two first jacks 131 are respectively located outside the first outer shell 11 and inside the first inner shell 12, and the two second jacks 132 are respectively located outside the first outer shell 11 and inside the first inner shell 12. A first jack groove 133 is provided on the outer wall of the first connecting piece 13, and the first jack groove 133 is connected to the two first jacks 131. The annular first receiving groove is adapted to the shape of the first coil, so as to facilitate the correct installation of the first coil. The first insertion slot 133 is used to accommodate the transition section of the first conductor 5 , which can ensure that the first conductor 5 is stably inserted into the first housing 1 , thereby enhancing the stability of the overall structure.

[0047] See also Figures 1 to 9 , and also includes a pin group, which includes a first pin group 8 and a second pin group 9. The first pin group 8 is provided on the first housing 1 and connected to the first coil. The second pin group 9 is provided on the second housing 2 and connected to the second coil 4. The pin group is used to connect the coil to transmit the induced current generated by electromagnetic induction, so as to facilitate the connection to the circuit for measurement.

[0048] See also Figures 1 to 9 The first pin group 8 includes a first pin seat 81 and two first pins 82. The second pin group 9 includes a second pin seat and two second pins. A first pin slot 14 is provided on the first shell 1. A second pin slot 24 is provided on the second shell 2. The first pin seat 81 is installed in the first pin slot 14, and the two first pins 82 are connected to the first coil. The second pin seat is installed in the second pin slot 24, and the two second pins are connected to the second coil 4. Through the cooperation of the pin slot and the pin seat, the installation of the pin group is more stable, which can prevent the pins from loosening or falling off.

[0049] See also Figures 1 to 9 , there are multiple groups of first pin groups 8. Multiple first pin slots 14 are provided at intervals. Multiple groups of first pin groups 8 are respectively installed in multiple first pin slots 14. Multiple groups of first pin groups 8 are connected to different positions respectively, which can realize comprehensive detection of leakage current. Multiple groups of first pin groups 8 are respectively installed in multiple first pin slots 14 with intervals, which is convenient for individual replacement of the first pin groups 8, and no additional design is required for the shell or the first pin seat 81, saving costs. In other embodiments, multiple groups of first pins 82 are connected together through a first pin seat 81, and it is necessary to set a first pin slot 14 with the same length or shape as the first pin seat 81 on the shell, so that the overall size of the first shell 1 is too large, or, the first pin seat 81 needs to be made into a length and shape that is compatible with the shape of the shell, and different first pin seats 81 need to be cast using molds according to the number of first pins 82, which is costly.

[0050] Although the present disclosure has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present disclosure can be embodied in a variety of forms without departing from the spirit or substance of the disclosure, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A combined mutual inductor, characterized in that: include: The housing comprises a first housing and a second housing stacked on the first housing, the bottom of the first housing is open, and the first housing is provided with two first jacks and two second jacks; An insulating cover, disposed in the first shell; A first coil is disposed in an insulating cover; A second coil is disposed in the second shell; The conductor has a U-shaped bending structure, so that the conductor has two pins and a transition section connecting the two pins, the conductor includes a first conductor and a second conductor, one pin of the first conductor is inserted into a first jack and arranged on the inner side of the first coil, the other pin of the first conductor is inserted into another first jack and arranged on the outer side of the first coil, one pin of the second conductor is inserted into a second jack and arranged on the inner side of the first coil and the second coil, the other pin of the first conductor is inserted into another second jack and arranged on the outer side of the first coil and the second coil, and the transition section of the first conductor and the transition section of the second conductor are both arranged in the second housing; An insulating member is disposed in the second shell, and includes a first insulating portion and a second insulating portion connected to each other, wherein the first insulating portion is disposed between the first conductor and the second coil, and the second insulating portion is disposed between the second conductor and the second coil.

2. The combined mutual inductor according to claim 1, characterized in that: The second insulating portion is in a U-shaped bending structure, so that the second insulating portion has two first insulating strips and a second insulating strip connecting the two first insulating strips; The two first insulating strips are respectively arranged between the two pins of the second conductor and the second coil; The second insulating strip is disposed between the transition section of the second conductor and the second coil; The first insulating strip is perpendicular to the first insulating portion, and the second insulating strip is parallel to the first insulating portion.

3. The combined mutual inductor according to claim 2, characterized in that: The insulating member further includes a third insulating portion; The third insulating portion is erected on the first insulating portion, and one of the first insulating strips is connected to the third insulating portion; The third insulating portion extends from an end of the first insulating portion close to the first insulating strip to an end of the first insulating portion away from the first insulating strip.

4. The combined mutual inductor according to claim 2, characterized in that: The width of the first insulating portion gradually increases from an end close to the first insulating strip to an end away from the first insulating strip; The transition section of the first conductor is arranged at an end of the first insulating portion away from the first insulating strip.

5. The combined mutual inductor according to claim 1, characterized in that: The second shell includes a second outer shell, a second inner shell and a second connecting piece connecting the second outer shell and the second inner shell; The second outer shell and the second inner shell are both annular, and the second outer shell is arranged outside the second inner shell; The inner wall of the second outer shell, the outer wall of the second inner shell and the inner wall of the second connecting piece are combined to form a second accommodating groove; The second coil and the insulating member are both arranged in the second containing groove.

6. The combined mutual inductor according to claim 5, characterized in that: A first positioning groove is concavely formed on the inner wall of the second shell; A second positioning groove is concavely formed on the outer wall of the second inner shell; A third positioning groove is concavely formed on the inner wall of the second connecting piece; The two pins of the second conductor are respectively arranged in the first positioning groove and the second positioning groove, and the transition section of the second conductor is arranged in the third positioning groove.

7. The combined mutual inductor according to claim 1, characterized in that: The first shell includes a first outer shell, a first inner shell and a first connecting piece connecting the first outer shell and the first inner shell; The first outer shell and the first inner shell are both annular, and the first outer shell is arranged outside the first inner shell; The inner wall of the first outer shell, the outer wall of the first inner shell and the inner wall of the first connecting piece are combined to form a first receiving groove; The first coil and the insulating cover are both arranged in the first containing groove; The two first plug holes are respectively located outside the first outer shell and inside the first inner shell, and the two second plug holes are respectively located outside the first outer shell and inside the first inner shell; A first plugging slot is provided on the outer wall of the first connecting piece, and the first plugging slot is connected to the two first plugging holes.

8. The combined mutual inductor according to claim 1, characterized in that: Also included is a pin group, the pin group includes a first pin group and a second pin group; The first pin group is arranged on the first housing and connected to the first coil; The second pin set is arranged on the second shell and connected to the second coil.

9. The combined mutual inductor according to claim 8, characterized in that: The first pin group includes a first pin seat and two first pins; The second pin group includes a second pin seat and two second pins; The first housing is provided with a first pin slot; The second housing is provided with a second pin slot; The first pin seat is installed in the first pin slot, and the two first pins are connected to the first coil; The second pin seat is installed in the second pin slot, and the two second pins are connected to the second coil.

10. The combined mutual inductor according to claim 9, characterized in that: The first pin group is provided with a plurality of groups; The first pin slots are provided with a plurality of slots at intervals; A plurality of the first plug pin groups are respectively installed in a plurality of the first plug pin slots.

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