Overheat protection structure for alternating current contactor coil

Abstract

The utility model relates to the technical field of contactor coils, in particular to an alternating current contactor coil overheating protection structure which comprises a sleeve, an alternating current contactor coil is installed in the sleeve, the top end of the alternating current contactor coil is connected with a PTC resistor in series, the PTC resistor is connected with a copper pin, and the copper pin is connected with the sleeve. The outer surface of the alternating current contactor coil is wrapped with an insulating tape, the PTC resistor is located between the insulating tape and the alternating current contactor coil, and a first heat conduction silicone grease layer is bonded between the insulating tape and the sleeve. The beneficial effects of the utility model are that the AC contactor coil and the PTC resistor are rapidly and well cooled, so that the current in the AC contactor coil can be rapidly and smoothly conducted; the abutting rings can abut against the two ends of the alternating current contactor coil, so that the alternating current contactor coil and the PTC resistor can be stably installed in the sleeve and are not prone to loosening and disengaging from the sleeve.

Description

Technical Field

[0001] The utility model relates to the technical field of contactor coils, in particular to an overheat protection structure of an AC contactor coil. Background Art

[0002] AC contactors are commonly used switching devices in the refrigeration and heat pump industries to control three-phase fixed-frequency compressors. In actual applications, there are many cases where AC contactor coils heat up and burn out, or plastic parts deform, causing contactor failure. There has been no good solution to this problem in the industry.

[0003] There are several situations that cause the AC contactor coil to heat up: first, the moving mechanism is stuck by foreign objects, and it cannot be attracted after power is turned on, and the coil will heat up rapidly until it burns or deforms; second, the AC contactor voltage is too low, and the attraction is unstable, causing the coil to heat up quickly and burn out; third, the voltage is too high or other abnormal conditions cause heating and burning. It can be seen that the problem of AC contactor coil heating is theoretically unavoidable, and it can only be solved by protecting it after heating.

[0004] Therefore, we need to design an AC contactor coil overheat protection structure to protect the safety of the AC contactor coil.

[0005] For example, the prior art Chinese patent publication number "CN209001576U" provides an AC contactor coil overheating protection structure, comprising a coil cavity (100) and an AC contactor coil (200) wound on the coil cavity, wherein a PTC resistor (300) is connected in series to the AC contactor coil, and an insulating tape (400) is wrapped around the AC contactor coil on the coil cavity, and the PTC resistor is located between the insulating tape and the AC contactor coil.

[0006] The device has the characteristics of being not easy to burn out, having good reliability and low protection cost when heated.

[0007] In the existing AC contactor coil overheat protection structure, the PTC resistor is installed inside the sleeve. After it generates heat, the heat dissipation and cooling speed on its surface is slow, and the heat dissipation speed on the surface of the AC contactor coil is also slow. There is a lack of a fast and good heat dissipation and cooling structure, and the current in the AC contactor coil cannot be quickly and smoothly. Moreover, after the AC contactor coil is installed in the sleeve, the installation and connection are relatively simple and prone to looseness, causing the AC contactor coil to detach from the sleeve, and no structure is set at both ends to abut and stably install the AC contactor coil. Utility Model Content

[0008] The purpose of the utility model is to solve the shortcomings in the prior art that the PTC resistor is installed inside the sleeve, and after it is heated, the heat dissipation and cooling speed of its surface is slow, and the heat loss speed of the surface of the AC contactor coil is also slow, lacking a fast and good heat dissipation and cooling structure, and the current in the AC contactor coil cannot be quickly and smoothly, and an AC contactor coil overheat protection structure is proposed.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] An AC contactor coil overheating protection structure is designed, comprising a sleeve, an AC contactor coil is installed inside the sleeve, a PTC resistor is connected in series to the top of the AC contactor coil, a copper pin is connected to the PTC resistor, an outer surface of the AC contactor coil is wrapped with an insulating tape, the PTC resistor is located between the insulating tape and the AC contactor coil, a first thermal conductive silicone grease layer is bonded between the insulating tape and the sleeve, a second thermal conductive silicone grease layer is bonded to the top of the PTC resistor, a thermal conductive silicone plate is bonded to the top of the second thermal conductive silicone grease layer, a first connecting hole is opened at the top of the thermal conductive silicone plate, a plug-in hole is opened at the top of the sleeve, a thermal conductive silicone column is slid through the inside of the plug-in hole, the bottom end of the thermal conductive silicone column is inserted into the first connecting hole, and a heat dissipation fin is fixed to the surface of the sleeve.

[0011] Furthermore, baffles are fixed at both ends of the sleeve, mounting holes are opened at the four corners of the surface of the baffle, a second connecting hole is opened on the surface of the baffle, a cover plate is installed on the outer ends of the baffle and the sleeve, a third connecting hole is opened on the surface of the cover plate, bolts are inserted between the third connecting hole and the second connecting hole, an abutment ring is bonded to the inner side of the cover plate, a second through hole is arranged in the middle of the abutment ring, and a first through hole is opened in the middle of the cover plate.

[0012] Furthermore, the sleeve is a cylindrical structure, the PTC resistor is connected in series to the AC contactor coil through the copper pin, the copper pin is an L-shaped structure, and the outer side of the first thermal grease layer is in contact with the inner surface of the sleeve.

[0013] Furthermore, the thermally conductive silicone plate is arranged on the inner side of the insulating tape, and the first connecting holes are threaded hole structures and are evenly distributed on the surface of the thermally conductive silicone plate.

[0014] Furthermore, the plug hole passes through the sleeve and is aligned with the first connecting hole in the upper and lower parts. The thermally conductive silicone column is a cylindrical structure, and its bottom end is detachably threadedly connected to the thermally conductive silicone plate through the first connecting hole.

[0015] Furthermore, the top of the thermally conductive silicone column protrudes from the top of the sleeve, the thermally conductive silicone column passes through the first thermally conductive silicone grease layer and the insulating tape, and the heat dissipation fins are evenly distributed on the outer surface of the sleeve.

[0016] Furthermore, the baffle is a rectangular plate structure, the second connecting hole is a threaded hole structure and is aligned with the third connecting hole, the cover plate is a circular plate structure, and the cover plate is detachably fastened to the cover plate by the bolts.

[0017] Furthermore, the first through hole and the second through hole are both circular hole structures, and the diameters are no larger than the inner diameter of the sleeve. The abutment ring is made of insulating rubber material and is tightly inserted into the two ends of the sleeve and abuts against the two ends of the AC contactor coil.

[0018] The utility model provides an AC contactor coil overheat protection structure, which has the following beneficial effects:

[0019] 1. The utility model arranges a first thermal grease layer between the insulating tape and the sleeve, arranges a second thermal grease layer and a thermal silicone plate at the top of the PTC resistor, and the thermal silicone column passing through the top of the sleeve is detachably connected to the thermal silicone plate. At the same time, heat dissipation fins are evenly distributed on the outside of the sleeve. In this way, during the use of the AC contactor coil and the PTC resistor, the first thermal grease layer and the heat dissipation fins are used to accelerate the heat dissipation and cooling speed of the AC contactor coil, and the second thermal grease layer, the thermal silicone plate and the thermal silicone column are used to accelerate the heat dissipation and cooling speed of the PTC resistor, so that the AC contactor coil and the PTC resistor are quickly and well cooled and dissipated, which facilitates the rapid and smooth flow of current in the AC contactor coil.

[0020] 2. The utility model has a cover plate detachably arranged on the outer side of the baffle by bolts, and an abutment ring is bonded on the inner side of the cover plate. In this way, during the disassembly and installation process of the AC contactor coil, the cover plate and the abutment ring can be removed, and the abutment ring can abut on both ends of the AC contactor coil, so that the AC contactor coil and the PTC resistor can be stably installed inside the sleeve, and are not prone to loosening or detaching from the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 For this utility model Figure 1 A cross-sectional view of

[0023] Figure 3 For this utility model Figure 2 A magnified image of point A;

[0024] Figure 4For this utility model Figure 2 The enlarged view of point B;

[0025] Figure 5 For this utility model Figure 2 Schematic diagram of the cross-sectional structure;

[0026] Figure 6 For this utility model Figure 5 Enlarged view of point C;

[0027] Figure 7 For this utility model Figure 6 Enlarged view of point D.

[0028] In the figure: 1. sleeve; 2. insulating tape; 3. heat dissipation fin; 4. AC contactor coil; 5. second connecting hole; 6. bolt; 7. mounting hole; 8. baffle; 9. cover plate; 10. abutment ring; 11. first through hole; 12. second through hole; 13. first thermal grease layer; 14. copper pin; 15. PTC resistor; 16. second thermal grease layer; 17. first connecting hole; 18. plug-in hole; 19. thermally conductive silicone column; 20. thermally conductive silicone plate; 21. third connecting hole. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] Example 1

[0031] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7, an AC contactor coil overheat protection structure shown in the figure includes a sleeve 1, an AC contactor coil 4 is installed inside the sleeve 1, a PTC resistor 15 is connected in series at the top of the AC contactor coil 4, a copper pin 14 is connected to the PTC resistor 15, an insulating tape 2 is wrapped around the outer surface of the AC contactor coil 4, the PTC resistor 15 is located between the insulating tape 2 and the AC contactor coil 4, a first thermal conductive silicone grease layer 13 is bonded between the insulating tape 2 and the sleeve 1, a second thermal conductive silicone grease layer 16 is bonded to the top of the PTC resistor 15, a thermal conductive silicone plate 20 is bonded to the top of the second thermal conductive silicone grease layer 16, a first connecting hole 17 is opened at the top of the thermal conductive silicone plate 20, a plug hole 18 is opened at the top of the sleeve 1, a thermal conductive silicone column 19 is slid through the inside of the plug hole 18, the bottom end of the thermal conductive silicone column 19 is inserted into the first connecting hole 17, and a heat dissipation fin 3 is fixed to the surface of the sleeve 1.

[0032] During the use of the AC contactor coil 4 and the PTC resistor 15, the first thermal grease layer 13 and the heat sink fins 3 are used to accelerate the heat dissipation and cooling of the AC contactor coil 4, and the second thermal grease layer 16, the thermal silicone plate 20 and the thermal silicone column 19 are used to accelerate the heat dissipation and cooling of the PTC resistor 15, so that the AC contactor coil 4 and the PTC resistor 15 are quickly and well cooled and radiated, which facilitates the rapid and smooth flow of current in the AC contactor coil 4.

[0033] The sleeve 1 is a cylindrical structure. The PTC resistor 15 is connected in series to the AC contactor coil 4 via the copper pin 14 . The copper pin 14 is an L-shaped structure. The outer side of the first thermal grease layer 13 contacts the inner surface of the sleeve 1 .

[0034] The thermally conductive silicone plate 20 is disposed on the inner side of the insulating tape 2 . The first connecting holes 17 are threaded hole structures and are evenly distributed on the surface of the thermally conductive silicone plate 20 .

[0035] The plug hole 18 passes through the sleeve 1 and is aligned with the first connecting hole 17 in vertical direction. The thermally conductive silicone column 19 is a cylindrical structure, and its bottom end is detachably threadedly connected to the thermally conductive silicone plate 20 through the first connecting hole 17 .

[0036] The top of the thermally conductive silicone column 19 protrudes from the top of the sleeve 1 , the thermally conductive silicone column 19 passes through the first thermally conductive silicone grease layer 13 and the insulating tape 2 , and the heat dissipation fins 3 are evenly distributed on the outer surface of the sleeve 1 .

[0037] Example 2

[0038] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , an AC contactor coil overheat protection structure shown in the figure includes a sleeve 1, an AC contactor coil 4 is installed inside the sleeve 1, a PTC resistor 15 is connected in series at the top of the AC contactor coil 4, a copper pin 14 is connected to the PTC resistor 15, an insulating tape 2 is wrapped around the outer surface of the AC contactor coil 4, the PTC resistor 15 is located between the insulating tape 2 and the AC contactor coil 4, a first thermal conductive silicone grease layer 13 is bonded between the insulating tape 2 and the sleeve 1, a second thermal conductive silicone grease layer 16 is bonded to the top of the PTC resistor 15, a thermal conductive silicone plate 20 is bonded to the top of the second thermal conductive silicone grease layer 16, a first connecting hole 17 is opened at the top of the thermal conductive silicone plate 20, a plug hole 18 is opened at the top of the sleeve 1, a thermal conductive silicone column 19 is slid through the inside of the plug hole 18, the bottom end of the thermal conductive silicone column 19 is inserted into the first connecting hole 17, and a heat dissipation fin 3 is fixed to the surface of the sleeve 1.

[0039] During the use of the AC contactor coil 4 and the PTC resistor 15, the first thermal grease layer 13 and the heat sink fins 3 are used to accelerate the heat dissipation and cooling of the AC contactor coil 4, and the second thermal grease layer 16, the thermal silicone plate 20 and the thermal silicone column 19 are used to accelerate the heat dissipation and cooling of the PTC resistor 15, so that the AC contactor coil 4 and the PTC resistor 15 are quickly and well cooled and radiated, which facilitates the rapid and smooth flow of current in the AC contactor coil 4.

[0040] Baffles 8 are fixed to both ends of the sleeve 1, mounting holes 7 are opened at the four corners of the surface of the baffle 8, a second connecting hole 5 is opened on the surface of the baffle 8, a cover plate 9 is installed on the outer ends of the baffle 8 and the sleeve 1, a third connecting hole 21 is opened on the surface of the cover plate 9, a bolt 6 is inserted between the third connecting hole 21 and the second connecting hole 5, an abutment ring 10 is bonded to the inner side of the cover plate 9, a second through hole 12 is provided in the middle of the abutment ring 10, and a first through hole 11 is opened in the middle of the cover plate 9.

[0041] During the disassembly and installation process of the AC contactor coil 4, the cover plate 9 and the abutment ring 10 can be removed, and the abutment ring 10 can abut against the two ends of the AC contactor coil 4, so that the AC contactor coil 4 and the PTC resistor 15 can be stably installed inside the sleeve 1, and are not prone to loosening and detaching from the sleeve 1.

[0042] The baffle plate 8 is a rectangular plate structure, the second connection hole 5 is a threaded hole structure and is aligned with the third connection hole 21 , the cover plate 9 is a circular plate structure, and the cover plate 9 is detachably fastened to the cover plate 9 by the bolts 6 .

[0043] The first through hole 11 and the second through hole 12 are both circular hole structures, and the diameters are no larger than the inner diameter of the sleeve 1 . The abutment ring 10 is made of insulating rubber material and is tightly inserted into both ends of the sleeve 1 and abuts against both ends of the AC contactor coil 4 .

[0044] Working method: By setting a first thermal grease layer 13 between the insulating tape 2 and the sleeve 1, setting a second thermal grease layer 16 and a thermal silicone plate 20 at the top of the PTC resistor 15, and the thermal silicone column 19 passing through the top of the sleeve 1 is detachably connected to the thermal silicone plate 20, and at the same time, the heat dissipation fins 3 are evenly distributed on the outside of the sleeve 1. In this way, during the use of the AC contactor coil 4 and the PTC resistor 15, the first thermal grease layer 13 and the heat dissipation fins 3 are used to accelerate the heat dissipation and cooling speed of the AC contactor coil 4, and the second thermal grease layer 16, the thermal silicone plate 20 and the thermal silicone column 19 are used to accelerate the heat dissipation and cooling speed of the PTC resistor 15, so that the AC contactor coil 4 and the PTC resistor 15 are quickly and well cooled and dissipated, which facilitates the rapid and smooth flow of current in the AC contactor coil 4.

[0045] A cover plate 9 is detachably provided on the outer side of the baffle plate 8 by means of bolts 6, and an abutment ring 10 is bonded on the inner side of the cover plate 9. Thus, during the disassembly and installation process of the AC contactor coil 4, the cover plate 9 and the abutment ring 10 can be removed, and the abutment ring 10 can abut against both ends of the AC contactor coil 4, so that the AC contactor coil 4 and the PTC resistor 15 can be stably installed inside the sleeve 1, and are not prone to loosening or detachment from the sleeve 1.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An AC contactor coil overheat protection structure, comprising a sleeve (1), characterized in that: An AC contactor coil (4) is installed inside the sleeve (1), a PTC resistor (15) is connected in series to the top of the AC contactor coil (4), a copper pin (14) is connected to the PTC resistor (15), an outer surface of the AC contactor coil (4) is wrapped with an insulating tape (2), the PTC resistor (15) is located between the insulating tape (2) and the AC contactor coil (4), a first thermal conductive silicone grease layer (13) is bonded between the insulating tape (2) and the sleeve (1), and the PTC resistor (15) is connected to the outer surface of the AC contactor coil (4). A second thermal grease layer (16) is bonded to the top of the TC resistor (15), a thermally conductive silicone plate (20) is bonded to the top of the second thermally conductive silicone grease layer (16), a first connecting hole (17) is opened at the top of the thermally conductive silicone plate (20), a plug hole (18) is opened at the top of the sleeve (1), a thermally conductive silicone column (19) slides through the inside of the plug hole (18), and the bottom end of the thermally conductive silicone column (19) is inserted into the first connecting hole (17), and a heat dissipation fin (3) is fixed to the surface of the sleeve (1).

2. The AC contactor coil overheat protection structure according to claim 1, characterized in that: Baffles (8) are fixed at both ends of the sleeve (1), mounting holes (7) are provided at four corners of the surface of the baffle (8), a second connecting hole (5) is provided on the surface of the baffle (8), a cover plate (9) is installed on the outer ends of the baffle (8) and the sleeve (1), a third connecting hole (21) is provided on the surface of the cover plate (9), a bolt (6) is inserted between the third connecting hole (21) and the second connecting hole (5), an abutment ring (10) is bonded to the inner side of the cover plate (9), a second through hole (12) is provided in the middle of the abutment ring (10), and a first through hole (11) is provided in the middle of the cover plate (9).

3. The AC contactor coil overheat protection structure according to claim 1, characterized in that: The sleeve (1) is of a cylindrical structure, the PTC resistor (15) is connected in series to the AC contactor coil (4) via the copper pin (14), the copper pin (14) is of an L-shaped structure, and the outer side of the first thermal conductive silicone grease layer (13) is in contact with the inner surface of the sleeve (1).

4. The AC contactor coil overheat protection structure according to claim 1, characterized in that: The thermally conductive silicone plate (20) is arranged on the inner side of the insulating tape (2); the first connection holes (17) are threaded hole structures and are evenly distributed on the surface of the thermally conductive silicone plate (20).

5. The AC contactor coil overheat protection structure according to claim 1, characterized in that: The plug hole (18) passes through the sleeve (1) and is aligned with the first connecting hole (17) in vertical alignment; the thermally conductive silicone column (19) is a cylindrical structure, and its bottom end is detachably threadedly connected to the thermally conductive silicone plate (20) through the first connecting hole (17).

6. The AC contactor coil overheat protection structure according to claim 1, characterized in that: The top end of the thermally conductive silicone column (19) protrudes from the top end of the sleeve (1), the thermally conductive silicone column (19) passes through the first thermally conductive silicone grease layer (13) and the insulating tape (2), and the heat dissipation fins (3) are evenly distributed on the outer surface of the sleeve (1).

7. The AC contactor coil overheat protection structure according to claim 2, characterized in that: The baffle plate (8) is a rectangular plate structure, the second connection hole (5) is a threaded hole structure and is aligned with the third connection hole (21), the cover plate (9) is a circular plate structure, and the cover plate (9) is detachably fastened to the cover plate (9) via the bolts (6).

8. The AC contactor coil overheat protection structure according to claim 2, characterized in that: The first through hole (11) and the second through hole (12) are both circular hole structures, and their diameters are no greater than the inner diameter of the sleeve (1). The abutment ring (10) is made of insulating rubber material and is tightly inserted into the two ends of the sleeve (1) and abuts against the two ends of the AC contactor coil (4).

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