Combined mutual inductor integrating electricity metering and electric leakage protection

Abstract

The utility model relates to the technical field of mutual inductors, in particular to a combined mutual inductor integrating electricity metering and electric leakage protection. Comprising a first mutual inductor body and a second mutual inductor body which are detachably arranged in a stacked mode, an embedding groove is formed in the side face of the first mutual inductor body, an embedding block is arranged on the side face of the second mutual inductor body, the first mutual inductor body and the second mutual inductor body rotate around the same rotating shaft in the opposite direction, and the embedding block is controllably embedded into the embedding groove or disengaged from the embedding groove; the first U-shaped rod and the second U-shaped rod are arranged in parallel, a single arm of the first U-shaped rod penetrates through the inner ring of the first mutual inductor, the end of the first U-shaped rod extends out of the first mutual inductor, a single arm of the second U-shaped rod penetrates through the inner ring of the first mutual inductor and the inner ring of the second mutual inductor, and the end of the second U-shaped rod extends out of the first mutual inductor. According to the utility model, the two mutual inductors are integrally designed, so that the occupied space of the product is reduced, and the miniaturization development is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, and particularly relates to a combined transformer integrating power metering and leakage protection. Background Art

[0002] Nowadays, people's attention to the safety and reliability of electricity use is increasing day by day. Especially with the popularization of electric vehicles, the safety and reliability of the charging process have attracted the attention of the whole society. Therefore, the state has introduced a new standard of "Safety Requirements and Test Specifications for Electric Vehicle Power Supply Equipment", which puts forward higher requirements for the safety and reliability of electric vehicle power supply and charging equipment.

[0003] Transformers are widely used in various electrical equipment and facilities, mainly for power metering, leakage detection and leakage protection. With the rapid development of the electric vehicle industry, it also brings new opportunities and challenges to the development of transformers. At present, the transformers for power metering and leakage protection are two kinds of transformer products. The metering transformers and leakage protection transformers on the market are used separately, and the assembly of multiple transformers will lead to a large area and space occupied on the circuit board, which is not conducive to the miniaturization of devices. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a combined transformer integrating power metering and leakage protection to solve the above technical problems;

[0005] The technical problems solved by the utility model can be realized by the following technical solutions:

[0006] A combined transformer integrating power metering and leakage protection includes

[0007] The first transformer and the second transformer which are detachably stacked. An embedding groove is arranged on the side surface of the first transformer, and an embedding block is arranged on the side surface of the second transformer. Based on the first transformer and the second transformer rotating in opposite directions along the same rotation axis, the embedding block can be controllably embedded into or disengaged from the embedding groove;

[0008] The first U-shaped bar and the second U-shaped bar which are arranged in parallel. One arm of the first U-shaped bar penetrates through the inner ring of the first transformer and the end extends out of the first transformer, and one arm of the second U-shaped bar penetrates through the inner rings of the first transformer and the second transformer and the end extends out of the first transformer.

[0009] Preferably, the first transformer includes

[0010] The first housing, a first middle column is arranged in the first housing, and a first pin slot is arranged on the side surface of the first housing;

[0011] The first winding coil is disposed within the first housing and sleeved on the first central column;

[0012] The first insulating colloid is filled within the first housing and covers the periphery of the first winding coil.

[0013] Preferably, the first winding coil includes a first toroidal core and a first coil wound around the first toroidal core. A first pin is connected to the end of the first coil, and the first pin is inserted into the first pin slot.

[0014] Preferably, two vertically penetrating assembly holes are respectively and parallelly provided on the outer edge of the first housing and on the first central column. The first U-shaped bar and the second U-shaped bar are both inserted through the assembly holes and their ends extend out from the assembly holes; the bottom of the first housing extends outward to form an annular groove, the interior of the annular groove is communicated with the assembly holes, the depth of the annular groove is adapted to the first U-shaped bar, and the bottom end of the first U-shaped bar is received within the annular groove.

[0015] Preferably, the embedding groove is provided on the first housing.

[0016] Preferably, the second mutual inductor includes,

[0017] A second housing, a second central column is provided within the second housing, and a second pin slot is provided on the side surface of the second housing;

[0018] A second winding coil is disposed within the second housing and sleeved on the second central column;

[0019] A second insulating colloid is filled within the second housing and covers the periphery of the second winding coil.

[0020] Preferably, the second central column is eccentrically disposed within the second housing; through holes are respectively provided on the outer edge of the second housing and on the second central column, the second U-shaped bar is inserted through the through holes, an insulating cover is further provided at the bottom of the second housing, and the bottom end of the second U-shaped bar is received within the insulating cover; the through holes are communicated with the assembly holes on the same side, and the second U-shaped bar passes through the through holes and then penetrates into the assembly holes.

[0021] Preferably, the second winding coil includes a second toroidal core and a second coil wound around the second toroidal core. A second pin is connected to the end of the second coil, the second pin is inserted into the second pin slot, and the second pin is the secondary side port of the second mutual inductor and together with the second U-shaped bar constitutes the detection port of the second mutual inductor.

[0022] Preferably, an embedding block is formed by extending the second housing outward near the second pin slot, and the second housing can be embedded into the embedding slot in the circumferential direction through the embedding block.

[0023] Preferably, a plurality of slot holes are provided on the outer sides of the first mutual inductor and the second mutual inductor, and insulating partition plates are inserted into the slot holes.

[0024] The beneficial effects of the present utility model are as follows: Due to the adoption of the above technical solutions, the present utility model integrates two mutual inductors, reduces the occupied space of the product, and is conducive to miniaturization development; the adjacent mutual inductors are connected by rotary embedding, and the pins will not be damaged during installation or disassembly, and the assembly is simple and convenient and the overall structure is more stable and reliable. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the overall structure of the combined mutual inductor in the embodiment of the present utility model;

[0026] Figure 2 It is an exploded view of the structure of the combined mutual inductor in the embodiment of the present utility model;

[0027] Figure 3 It is a schematic diagram of the structure of the first mutual inductor in the embodiment of the present utility model;

[0028] Figure 4 It is a schematic diagram of the structure of the first housing in the embodiment of the present utility model;

[0029] Figure 5 It is a schematic diagram of the structure of the bottom of the first housing in the embodiment of the present utility model;

[0030] Figure 6 It is a schematic diagram of the structure of the second mutual inductor in the embodiment of the present utility model;

[0031] Figure 7 It is a schematic diagram of the structure of the second housing in the embodiment of the present utility model.

[0032] In the drawings: 1. First mutual inductor; 11. First U-shaped bar; 12. First housing; 121. First middle column; 122. First pin slot; 123. Assembly hole; 124. Annular groove; 13. First winding coil; 131. First annular magnetic core; 132. First coil; 133. First pin; 14. First insulating colloid; 15. Slot hole; 16. Insulating partition plate; 17. Embedding slot; 2. Second mutual inductor; 21. Second U-shaped bar; 22. Second housing; 221. Second middle column; 222. Second pin slot; 223. Through hole; 23. Second winding coil; 231. Second annular magnetic core; 232. Second coil; 233. Second pin; 24. Second insulating colloid; 25. Embedding block; 26. Insulating cover. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0035] Next, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments, but it is not limited to the present invention.

[0036] A combined transformer integrating power metering and leakage protection, as Figures 1 to 6 shown, includes,[[]]

[0037] The first transformer 1 and the second transformer 2 are detachably stacked. An embedding groove 17 is provided on the side of the first transformer 1, and an embedding block 25 is provided on the side of the second transformer 2. Based on the first transformer 1 and the second transformer 2 rotating in opposite directions along the same rotation axis, the embedding block 25 can be controllably embedded in or disengaged from the embedding groove 17;

[0038] The first U-shaped bar 11 and the second U-shaped bar 21 are arranged in parallel. One arm of the first U-shaped bar 11 penetrates through the inner ring of the first transformer 1 and the end extends out of the first transformer 1. One arm of the second U-shaped bar 21 penetrates through the inner ring of the first transformer 1 and the inner ring of the second transformer 2 and the end extends out of the first transformer 1.

[0039] Specifically, the first transformer 1 and the second transformer 2 of the present invention are disassembled or connected by rotating relative to each other, and the first transformer 1 and the second transformer 2 are stacked up and down. The first U-shaped bar 11 passes through the first transformer 1 from bottom to top and serves as the primary side port of the first transformer 1 (i.e., the leakage current). The second U-shaped bar 21 passes through the second transformer 2 and the first transformer 1 from bottom to top and serves as the primary side port of the first transformer 1 and the second transformer 2 (i.e., for both power metering and leakage protection).

[0040] The first transformer 1 and the second transformer 2 are connected by a rotation-fitting method. First, the first U-shaped bar 11 is inserted into the first transformer 1, then the first transformer 1 and the second transformer 2 are rotationally connected, and finally the second U-shaped bar 21 is inserted into the second transformer 2 and the first transformer 1 to complete the assembly of the combined transformer.

[0041] The utility model integrates the first mutual inductor 1 and the second mutual inductor 2. Compared with the existing mutual inductors that need to be installed in different areas of the main board respectively, the occupied space of the product is greatly reduced, which is beneficial to miniaturization development. The adjacent first mutual inductor 1 and second mutual inductor 2 are connected by rotary embedding. When installing or disassembling, the pins will not be damaged. The assembly is simple and convenient, and the overall structure is more stable and reliable.

[0042] In a preferred embodiment, the first mutual inductor 1 includes

[0043] a first housing 12, a first middle column 121 is arranged inside the first housing 12, and a first pin slot 122 is arranged on the side surface of the first housing 12;

[0044] a first winding coil 13, which is arranged inside the first housing 12 and sleeved on the first middle column 121;

[0045] a first insulating colloid 14, which is filled inside the first housing 12 and covers the periphery of the first winding coil 13.

[0046] In a preferred embodiment, the first winding coil 13 includes a first annular magnetic core 131 and a first coil 132 wound around the first annular magnetic core 131. A first pin 133 is connected to the end of the first coil 132, and the first pin 133 is inserted into the first pin slot 122.

[0047] Specifically, first pins 133 are welded to both ends of the first coil 132, and the first pins 133 are inserted into the first pin slots 122. In the utility model, the first mutual inductor 1 is a leakage mutual inductor for detecting the leakage current in the main circuit. Both ends of the first coil 132 are welded to a first pin 133, that is, the first mutual inductor 1 has a total of 2 first pins 133. Correspondingly, 2 first pin slots 122 for placing the first pins 133 are arranged on the side wall of the first housing 12. The first pins 133 are the secondary side ports of the first mutual inductor 1 and jointly form the detection port of the first mutual inductor 1 with the first U-shaped bar 11.

[0048] The first winding coil 13 is sleeved on the first middle column 121 inside the first housing 12. The first pins 133 are inserted into the corresponding first pin slots 122. Then, the first insulating colloid 14 is potted inside the first housing 12. After the first insulating colloid 14 is completely cured, the first U-shaped bar 11 is inserted, and finally the first mutual inductor 1 is obtained.

[0049] In a preferred embodiment, two vertically penetrating assembly holes 123 are respectively provided in parallel on the outer edge of the first shell 12 and the first center column 121, the first U-shaped rod 11 and the second U-shaped rod 21 are both inserted into the assembly holes 123 and their ends both extend out of the assembly holes 123; the bottom of the first shell 12 extends outward to form an annular groove 124, the interior of the annular groove 124 is connected to the assembly hole 123, the depth of the annular groove 124 is adapted to the first U-shaped rod 11, and the bottom end of the first U-shaped rod 11 is accommodated in the annular groove 124.

[0050] Specifically, two assembly holes 123 are provided on the side wall of the first shell 12 and the first center column 121. The assembly holes 123 located on the same side of the first shell 12 and the first center column 121 constitute a group, totaling two groups, which are used to assemble the first U-shaped rod 11 and the second U-shaped rod 21 respectively; the bottom of the first shell 12 also extends outward to form an annular groove 124, and the depth of the annular groove 124 is adapted to the first U-shaped rod 11, so that the bottom end of the first U-shaped rod 11 can be completely accommodated in the annular groove 124.

[0051] In a preferred embodiment, the second mutual inductor 2 includes:

[0052] A second housing 22 , wherein a second center column 221 is disposed in the second housing 22 , and a second pin groove 222 is disposed on a side surface of the second housing 22 ;

[0053] The second winding coil 23 is disposed in the second housing 22 and sleeved on the second center column 221;

[0054] The second insulating colloid 24 is filled in the second housing 22 and covers the circumference of the second winding coil 23 .

[0055] In a preferred embodiment, the second center column 221 is eccentrically arranged in the second shell 22; a through hole 223 is respectively provided on the outer edge of the second shell 22 and the second center column 221, and the second U-shaped rod 21 is inserted into the through hole 223. An insulating cover 26 is also provided at the bottom of the second shell 22, and the bottom end of the second U-shaped rod 21 is accommodated in the insulating cover 26; the through hole 223 is connected to the assembly hole 123 on the same side of the first shell 12 and the first center column 121, and the second U-shaped rod 21 passes through the through hole 223 and then enters the assembly hole 123.

[0056] Specifically, a through hole 223 is respectively provided on the second shell 22 and the second center column 221. The two through holes 223 are connected to one group of assembly holes 123 on the first shell 12. The second U-shaped rod 21 can pass through the through hole 223 and the assembly hole 123 from bottom to top in sequence, and finally pass out from the other side of the assembly hole 123.

[0057] Further specifically, the second central column 221 is eccentrically arranged within the second housing 22. The second winding coil 23 is sleeved around the periphery of the second central column 221. From the perspective of the superposition of the two transformers up and down, the axes of the first winding coil 13 and the second winding coil 23 are spaced apart by a certain distance, so that there is enough space in the integrated transformer to simultaneously arrange the first U-shaped bar 11 and the second U-shaped bar 21. An insulating cover 26 is also provided at the bottom of the second housing 22. After the second U-shaped bar 21 passes through the through hole 223 from bottom to top, its bottom will be exposed outside. After setting the insulating cover 26, it can have better insulation performance. The insulating cover 26 and the bottom of the second housing 22 can be connected by conventional methods such as sleeving and buckling, as long as it is ensured that the insulating cover is not easily detached, which will not be elaborated here.

[0058] In a preferred embodiment, the second winding coil 23 includes a second toroidal core 231 and a second coil 232 wound around the second toroidal core 231. A second pin 233 is connected to the end of the second coil 232. The second pin 233 is inserted into the second pin slot 222. The second pin 233 is the secondary side port of the second transformer 2 and together with the second U-shaped bar 21 constitutes the detection port of the second transformer 2.

[0059] Specifically, the second transformer 2 is a current transformer for measuring the current value flowing through the main circuit. A group of second coils 232 are wound around the second toroidal core 231. A second pin 233 is welded to each of the two ends of the second coil 232. That is, the second transformer 2 has a total of 2 first pins 133. Correspondingly, 2 second pin slots 222 for placing the second pins 233 are provided on the side wall of the second housing 22. The second pin 233 is the secondary side port of the second transformer 2 and together with the second U-shaped bar 21 constitutes the detection port of the second transformer 2. The second winding coil 23 is sleeved on the second central column 221 within the second housing 22, and the second pins 233 are inserted into the corresponding second pin slots 222. Then, the second insulating colloid 24 is potted within the second housing 22. After the second insulating colloid 24 is completely cured, the second transformer 2 and the first transformer 1 are assembled, and the second U-shaped bar 21 is inserted into the second transformer 2 and the first transformer 1 in sequence from the bottom of the second transformer 2, and finally the combined transformer is obtained.

[0060] In a preferred embodiment, an embedding groove 17 is provided on the first housing 12. An embedding block 25 extends outward near the second pin slot 222 of the second housing 22. The second housing 22 can be circumferentially embedded into the embedding groove 17 of the first housing 12 through the embedding block 25.

[0061] Specifically, an embedding groove 17 is provided on the side surface of the first housing 12. The embedding groove 17 can be arranged at any position on the side surface of the first housing 12 according to actual needs. In the embodiment, it is preferably arranged on one side of the first pin groove 122. The side of the embedding groove 17 away from the first pin groove 122 is an open mechanism, and its width allows the second pin 233 to pass through without obstruction. A further embedding block 25 is provided on the second housing 22. The embedding block 25 is arranged at one end of the second pin groove 222 away from the embedding groove 17. The embedding block 25 protrudes upward from the surface of the second housing 22. The size of the end of the embedding block 25 close to the embedding groove 17 is not greater than the width of the embedding groove 17, and the size of the bottom end of the embedding block 25 away from the embedding groove 17 exceeds the width of the embedding groove 17. As a limiting structure, the total length of the second pin groove 222 and the embedding block 25 is adapted to the depth of the embedding groove 17, that is, when the second pin 233 is turned into the embedding groove 17 and the embedding block 25 is embedded in the embedding groove 17, the through hole 223 of the second transformer 2 coincides and communicates with a set of assembly holes 123 of the first transformer 1 exactly. The rotation-embedded connection is adopted, which will not cause damage to the pins during installation or disassembly, and the assembly is simple and convenient, and the overall structure is more stable and reliable.

[0062] In a preferred embodiment, a plurality of slot grooves 15 are provided on the outer sides of the first transformer 1 and the second transformer 2, and insulating partitions 16 are inserted into the slot grooves 15.

[0063] Specifically, at least a part of the first U-shaped rod 11, the second U-shaped rod 21, the first pin 133 and the second pin 233 is located outside the first insulating colloid 14; a plurality of slot grooves 15 are further provided between the parts of the first U-shaped rod 11, the second U-shaped rod 21, the first pin 133 and the second pin 233 located outside the first insulating colloid 14, and insulating partitions 16 are inserted into the slot grooves 15.

[0064] In the present utility model, insulating partitions 16 are provided between the first pin 133, the second pin 233, the first U-shaped rod 11 and the second U-shaped rod 21. Since the transformers are relatively small in size, the distance between the U-shaped rods (including the first U-shaped rod 11 and the second U-shaped rod 21) and the pins (including the first pin 133 and the second pin 233) is very close, and adverse phenomena such as electric arcs are likely to occur. The provision of the insulating partitions 16 can effectively avoid this situation.

[0065] The above are only the preferred embodiments of the present utility model, and do not limit the implementation manners and protection scope of the present utility model accordingly. For those skilled in the art, it should be able to realize that all the equivalent replacements and obvious changes made by using the description and illustrations of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A combined transformer with integrated electricity metering and leakage protection, characterized in that: include, A first mutual inductor (1) and a second mutual inductor (2) are detachably stacked, wherein the side of the first mutual inductor (1) is provided with an embedding groove (17), and the side of the second mutual inductor (2) is provided with an embedding block (25), and based on the first mutual inductor (1) and the second mutual inductor (2) rotating in opposite directions along the same rotation axis, the embedding block (25) can be controllably embedded in the embedding groove (17) or separated from the embedding groove (17); A first U-shaped rod (11) and a second U-shaped rod (21) are arranged in parallel, wherein a single arm of the first U-shaped rod (11) passes through the inner ring of the first mutual inductor (1) and an end portion thereof extends outside the first mutual inductor (1), and a single arm of the second U-shaped rod (21) passes through the inner ring of the first mutual inductor (1) and the inner ring of the second mutual inductor (2) and an end portion thereof extends outside the first mutual inductor (1).

2. The combined mutual inductor according to claim 1, characterized in that: The first mutual inductor (1) comprises: A first shell (12), wherein a first center column (121) is provided inside the first shell (12), and a first pin groove (122) is provided on a side surface of the first shell (12); A first winding coil (13) is disposed in the first housing (12) and sleeved on the first center column (121); A first insulating colloid (14) is filled in the first shell (12) and covers the circumference of the first winding coil (13).

3. The combined mutual inductor according to claim 2, characterized in that: The first winding coil (13) comprises a first annular magnetic core (131) and a first coil (132) wound on the first annular magnetic core (131); a first pin (133) is connected to an end of the first coil (132); and the first pin (133) is inserted into the first pin slot (122).

4. The combined mutual inductor according to claim 2, characterized in that: Two vertically penetrating assembly holes (123) are respectively arranged in parallel on the outer edge of the first shell (12) and the first center column (121); the first U-shaped rod (11) and the second U-shaped rod (21) are both inserted into the assembly holes (123) and their ends are both extended from the assembly holes (123); the bottom of the first shell (12) extends outward to form an annular groove (124); the interior of the annular groove (124) is connected to the assembly hole (123); the depth of the annular groove (124) is adapted to the first U-shaped rod (11); and the bottom end of the first U-shaped rod (11) is accommodated in the annular groove (124).

5. The combined mutual inductor according to claim 2, characterized in that: The embedding groove (17) is arranged on the first shell (12).

6. The combined mutual inductor according to claim 4, characterized in that: The second mutual inductor (2) comprises: A second shell (22), wherein a second center column (221) is provided inside the second shell (22), and a second pin groove (222) is provided on a side surface of the second shell (22); A second winding coil (23) is disposed in the second housing (22) and sleeved on the second center column (221); The second insulating colloid (24) is filled in the second shell (22) and covers the circumference of the second winding coil (23).

7. The combined mutual inductor according to claim 6, characterized in that: The second center column (221) is eccentrically arranged in the second shell (22); through holes (223) are respectively arranged on the outer edge of the second shell (22) and the second center column (221); the second U-shaped rod (21) is inserted into the through hole (223); an insulating cover (26) is also arranged at the bottom of the second shell (22); the bottom end of the second U-shaped rod (21) is accommodated in the insulating cover (26); the through hole (223) is connected to the assembly hole (123) on the same side; the second U-shaped rod (21) passes through the through hole (223) and then enters the assembly hole (123).

8. The combined mutual inductor according to claim 6, characterized in that: The second winding coil (23) comprises a second annular magnetic core (231) and a second coil (232) wound on the second annular magnetic core (231); a second pin (233) is connected to an end of the second coil (232); and the second pin (233) is inserted into a second pin slot (222).

9. The combined mutual inductor according to claim 6, characterized in that: The second shell (22) extends outward near the second pin groove (222) to form the embedding block (25), and the second shell (22) can be embedded in the embedding groove (17) along the circumferential direction through the embedding block (25).

10. The combined mutual inductor according to claim 1, characterized in that: A plurality of slots (15) are provided on the outer sides of the first mutual inductor (1) and the second mutual inductor (2), and insulating partitions (16) are inserted into the slots (15).

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