Epoxy sealed direct current contactor

Abstract

The utility model discloses an epoxy sealed DC contactor, which comprises an electromagnetic driving mechanism, a main contact structure and an auxiliary switch structure, the electromagnetic driving mechanism is provided with a push rod and a driving unit capable of driving the push rod to move up and down, and the main contact structure is provided with a static contact and a movable contact piece located below the static contact and connected with the push rod; the auxiliary switch structure is provided with a microswitch located below the movable contact piece and an ejector rod which is connected with the push rod and located above the microswitch, and when the push rod drives the movable contact piece to be attracted and communicated with the static contact, the ejector rod can synchronously move along with the push rod so as to be separated from a swing rod of the microswitch and enable a normally-closed contact of the microswitch to be in a closed state; when the push rod drives the movable contact piece to be disconnected from the static contact, the ejector rod can abut against the swing rod of the microswitch, and the normally-closed contact of the microswitch is in a disconnected state. The epoxy sealed direct-current contactor has the characteristics of simple and reasonable structure, easiness in processing and manufacturing, high synchronism and reliability during working and the like, and meets the market requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to an epoxy-sealed DC contactor which utilizes a normally closed contact of a micro switch to convert a feedback signal. Background Art

[0002] An epoxy-sealed DC contactor is an electrical component that controls the on / off switching of a DC circuit. It primarily controls the circuit by disconnecting or connecting the current. Compared to conventional AC contactors, it offers higher withstand voltage, interrupting capacity, and better electrical performance. Currently, epoxy-sealed DC contactors are widely used in industries such as power systems, rail transit, new energy, and energy storage.

[0003] In epoxy-sealed DC contactor structures currently available on the market, the contact signal from a microswitch is typically converted into a feedback signal for the DC contactor, providing real-time feedback on the operating status of the DC contactor's main contact structure. However, because the microswitch is typically located above the DC contactor's moving contact for triggering, this places high demands on the structural design precision of the contactor product. Otherwise, when the static contact and moving contact of the contactor adhere, the microswitch may not be fully triggered due to insufficient travel, resulting in distorted feedback signals from the microswitch.

[0004] In view of this, the present utility model is proposed. Summary of the Invention

[0005] In order to overcome the above-mentioned defects, the utility model provides an epoxy-sealed DC contactor, which is not only simple and reasonable in structure, easy to process and manufacture, and has low production cost; but also has very high synchronization and reliability during operation, which well meets market demand.

[0006] The technical solution adopted by the utility model to solve its technical problems is: an epoxy-sealed DC contactor, including an electromagnetic drive mechanism, a main contact structure and an auxiliary switch structure, the electromagnetic drive mechanism is provided with a push rod arranged vertically and a drive unit capable of driving the push rod to move up and down, the main contact structure is provided with a static contact and a dynamic contact piece located below the static contact and connected to the push rod; the auxiliary switch structure is provided with a microswitch located below the dynamic contact piece and a push rod connected to the push rod and located above the microswitch, when the push rod drives the dynamic contact piece to be attracted and connected with the static contact, the push rod can move synchronously with the push rod to disengage from the rocker arm of the microswitch, and make the normally closed contact of the microswitch in a closed state; and when the push rod drives the dynamic contact piece to be disconnected from the static contact, the push rod can press against the rocker arm of the microswitch, and make the normally closed contact of the microswitch in an open state.

[0007] As a further improvement of the present invention, the DC contactor further comprises an arc extinguishing hood, and the micro switch is fixedly built into the arc extinguishing hood;

[0008] The electromagnetic drive mechanism is further provided with an insulating seat fixedly sleeved on the upper portion of the push rod, and the push rod is fixedly connected to the insulating seat.

[0009] As a further improvement of the present invention, the DC contactor further includes a guide plate fixedly connected to the lower side of the arc extinguishing hood, and the micro switch is selectively fixedly connected to the inner wall of the arc extinguishing hood or the guide plate.

[0010] As a further improvement of the present invention, the arc extinguishing cover is provided with an arc extinguishing cover body and an arc extinguishing wall body fixedly connected to the lower side of the arc extinguishing cover body, the arc extinguishing cover body is penetrated by a mounting hole for installing the static contact, and the micro switch is fixedly provided on the inner side of the arc extinguishing wall body.

[0011] As a further improvement of the present invention, the guide plate is provided with a plate body fixedly connected to the lower side of the arc extinguishing cover and a receiving block integrally provided on the upper side of the plate body, the plate body is penetrated by a through hole A for the push rod to pass through, and the micro switch is fixedly provided on the receiving block.

[0012] As a further improvement of the present invention, the insulating seat, the ejector rod and the push rod are fixedly connected into one body through an injection molding process.

[0013] As a further improvement of the present invention, the auxiliary switch structure is further provided with a lead-out terminal, and the lead-out terminal is electrically connected to the normally closed contact of the micro switch.

[0014] As a further improvement of the present invention, the auxiliary switch structure is further provided with a control circuit board, and the micro switch and the lead terminal are respectively welded to the control circuit board and electrically connected.

[0015] As a further improvement of the present invention, the arc extinguishing cover is provided with a through hole B for the lead terminal to pass through;

[0016] The control circuit board is also fixedly arranged on the receiving block.

[0017] As a further improvement of the present invention, the upper portion of the push rod is extended into the arc extinguishing cover, and the top end of the push rod is located above the micro switch;

[0018] The movable contact piece is sleeved on the top end of the push rod, and a contact spring capable of providing elastic supporting force to the movable contact piece is further provided between the movable contact piece and the insulating seat.

[0019] The beneficial effects of the present utility model are as follows: compared with the prior art, ① the present utility model improves the structure of the contactor product and sets the micro switch below the moving contact piece, which can effectively avoid the undesirable phenomenon that the micro switch is not fully triggered due to insufficient stroke, thereby ensuring that the on-off operation of the auxiliary switch structure is completely synchronized with the on-off operation of the main contact structure, that is, it greatly improves the accuracy and reliability of the feedback signal of the auxiliary switch structure, thereby greatly improving the synchronization and reliability of the contactor product during operation. In addition, the installation layout design of the auxiliary switch structure of the present utility model also greatly reduces the design accuracy requirements for the contactor product structure, which is beneficial to the processing and manufacturing of the contactor product. ② The contactor product provided by the present utility model has a simple and reasonable structure, is easy to process and manufacture, and has a low production cost. In short, the present utility model has greatly promoted the production and development of epoxy-sealed DC contactor products by making the above-mentioned structural improvements to the contactor product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic cross-sectional view of the epoxy-sealed DC contactor according to Example 1 of the present utility model;

[0021] Figure 2 for Figure 1 A partially enlarged schematic diagram of the cross-sectional structure of the epoxy-sealed DC contactor shown;

[0022] Figure 3 This is a schematic diagram of the assembly structure when the auxiliary switch structure, the electromagnetic drive mechanism part and the guide plate of Example 1 of the present utility model are assembled together;

[0023] Figure 4 for Figure 3 A schematic cross-sectional view of the assembly structure shown;

[0024] Figure 5 for Figure 3 A schematic diagram of a partial structure of the auxiliary switch structure shown;

[0025] Figure 6 for Figure 3 A schematic structural diagram of the guide plate shown;

[0026] Figure 7 This is a schematic diagram of the assembly structure when the static contact and the arc extinguishing cover described in Example 1 of the utility model are assembled together.

[0027] The following description is made with reference to the accompanying drawings:

[0028] 10. Push rod; 11. Insulation seat; 12. Gasket; 13. Coil winding; 130. Stop convex edge; 14. Magnetic bushing; 15. Moving iron core; 16. Reset spring; 20. Static contact; 21. Moving contact piece; 30. Micro switch; 300. Rocker arm; 31. Push rod; 32. Lead-out terminal; 33. Control circuit board; 4. Arc extinguishing cover; 40. Arc extinguishing cover body; 41. Arc extinguishing wall body; 42. Perforation B; 5. Guide plate; 50. Plate body; 51. Receiving block; 52. Perforation A; 6. Contact spring; 7. End cover. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] Example 1:

[0031] Please see the attached Figure 1 To the attached Figure 7 As shown, this embodiment 1 provides an epoxy-sealed DC contactor, which includes an electromagnetic drive mechanism, a main contact structure and an auxiliary switch structure. The electromagnetic drive mechanism is provided with a push rod 10 arranged vertically and a drive unit capable of driving the push rod 10 to move up and down. The main contact structure is provided with a static contact 20 and a dynamic contact piece 21 located below the static contact 20 and connected to the push rod 10 at the same time, and the dynamic contact piece 21 can be connected or disconnected with the static contact 20 under the drive of the push rod 10; the auxiliary switch structure is provided with a micro switch 30 located below the dynamic contact piece 21 and a top rod 31 connected to the push rod 10 and located above the micro switch 30 at the same time. When the push rod 10 drives the dynamic contact piece 21 to be connected with the static contact 20, The push rod 31 can move synchronously with the push rod 10 to disengage from the rocker rod 300 of the micro switch 30 (that is, the rocker rod 300 is in a freely released state), thereby making the normally closed contact of the micro switch 30 in a closed state, that is: the micro switch 30 feeds back a closing signal, which is synchronized with the working state of the main contact structure at that time; and when the push rod 10 drives the movable contact piece 21 to be disconnected from the static contact 20, the push rod 31 can move synchronously with the push rod 10 to press against the rocker rod 300 of the micro switch 30 (that is, the rocker rod 300 is in a compressed state), thereby making the normally closed contact of the micro switch 30 in a disconnected state, that is: the micro switch 30 feeds back a disconnection signal, which is synchronized with the working state of the main contact structure at that time.

[0032] As can be seen from the above, compared to the prior art, this embodiment 1, by locating the microswitch 30 below the movable contact piece 21, can effectively avoid the undesirable phenomenon of the microswitch 30 not being fully triggered due to insufficient travel. This effectively ensures that the on-off operation of the auxiliary switch structure is completely synchronized with the on-off operation of the main contact structure. This greatly improves the accuracy and reliability of the feedback signal of the auxiliary switch structure, thereby greatly improving the synchronization and reliability of the contactor product during operation. In addition, the installation layout design of the auxiliary switch structure in this embodiment 1 also greatly reduces the design accuracy requirements of the contactor product structure, thereby facilitating the processing and manufacturing of the contactor product.

[0033] The specific structure of the epoxy-sealed DC contactor described in Example 1 is described in detail below.

[0034] First, regarding the auxiliary switch structure.

[0035] In this embodiment 1, the specific installation layout of the auxiliary switch structure is preferably designed as follows: Figure 1 To the attached Figure 4 As shown, the DC contactor also includes an arc extinguishing cover 4 made of ceramic or insulating plastic material and a guide plate 5 made of insulating plastic material and fixedly connected to the lower side of the arc extinguishing cover 4 (the guide plate 5 and the arc extinguishing cover 4 together form an arc extinguishing chamber / or called an arc extinguishing space), the micro switch 30 is fixedly connected to the upper side of the guide plate 5, and at the same time, the micro switch 30 is also built into / extended in the arc extinguishing cover 4; after the upper part of the push rod 10 passes through the guide plate 5, it is movably inserted / extended in the arc extinguishing cover 4, and the top end of the push rod 10 must be higher than the micro switch 30 (that is, the top end of the push rod 10 is located above the micro switch 30) to achieve the position of the moving contact piece 21 above the micro switch 30 (based on the conventional design of the contactor product, the moving contact piece 21 is sleeved on the top end of the push rod 10); in addition, an insulating seat 11 is fixedly sleeved on the upper part of the push rod 10, and the top rod 31 is fixedly connected to the insulating seat 11.

[0036] Furthermore, the specific implementation structure of this embodiment 1 to fix the micro switch 30 to the upper side of the guide plate 5 is as follows: Figure 3 and 4As shown, the guide plate 5 includes a plate body 50 fixedly connected to the lower side of the arc extinguishing cover 4 (via snap connection, riveting, adhesive bonding, or welding) and a receiving block 51 integrally provided on the upper side of the plate body 50. The micro switch 30 is fixedly mounted on the receiving block 51 by welding or locating pin connection. Note: Regarding the "locating pin connection method," specifically, a locating pin is provided on the receiving block 51, and the micro switch 30 is hooked on the locating pin through a locating hole provided therein.

[0037] In addition, based on the above structure of the guide plate 5 , a through hole A52 is further provided on the plate body 50 for the push rod 10 to pass through.

[0038] Furthermore, in this embodiment 1, the insulating seat 11 is fixedly mounted on the upper portion of the push rod 10, and the push rod 31 is fixedly connected to the insulating seat 11. The insulating seat 11, the push rod 31, and the push rod 10 are fixedly connected to form a whole through an injection molding process. It is understood that the insulating seat 11 and the push rod 31 are both made of insulating plastic material.

[0039] Furthermore, based on the installation method of the movable contact piece 21, this embodiment 1 also includes a gasket 12 fixedly mounted on the top end of the push rod 10 to stop and limit the movable contact piece 21, and a contact spring 6 is provided between the movable contact piece 21 and the insulating seat 11 to provide elastic support force to the movable contact piece 21. The gasket 12 and contact spring 6 are both conventional technical means in the field of contactor technology and will not be described in detail here.

[0040] Furthermore, in this embodiment 1, the auxiliary switch structure is further provided with a lead terminal 32 and a control circuit board 33. Please continue to refer to the attached Figure 3 and 4 As shown, the control circuit board 33 is fixedly mounted on the receiving block 51 by welding, and the contacts (i.e., pins) of the microswitch 30 and the lead terminals 32 are respectively welded and electrically connected to the control circuit board 33, thereby electrically connecting the lead terminals 32 to the normally closed contacts of the microswitch 30. It is understood that an external signal detection device can be connected to the lead terminals 32 to detect the operating state (closed or open state) of the normally closed contacts of the microswitch 30.

[0041] In addition, in order to meet the installation requirements of the lead-out terminal 32, this embodiment 1 also provides a through hole B42 for the lead-out terminal 32 to pass through on the arc extinguishing cover 4 (specifically, the arc extinguishing cover 40 described below). Figure 7Furthermore, in this embodiment 1, a transfer terminal (not shown) is provided on the end cover 7, and the lead terminal 32 passes through the through hole B42 and is welded and fixedly connected to the transfer terminal, and the transfer terminal is used to directly connect to an external signal detection device.

[0042] Next, regarding other structures.

[0043] In this embodiment 1, the specific implementation structure adopted by the arc extinguishing cover 4 is: please continue to refer to Figure 7, the arc extinguishing cover 4 is provided with an arc extinguishing cover body 40 and an arc extinguishing wall body 41 fixedly connected to the lower side of the arc extinguishing cover body 40, and the arc extinguishing cover body 40 is penetrated by the through hole B42 and the mounting hole for installing the static contact 20.

[0044] The specific implementation structure adopted by the driving unit is: please continue to refer to Figures 1 and 2, the driving unit is provided with a coil winding 13, a magnetic sleeve 14 positioned and built into the space surrounded by the coil winding 13, a moving iron core 15 inserted into the magnetic sleeve 14 and slidingly engaged with the magnetic sleeve 14 in the up and down directions, and a reset spring 16, the coil winding 13 is located below the guide plate 5, the moving iron core 15 is fixedly connected to the lower end of the push rod 10, the reset spring 16 is sleeved on the outside of the lower part of the push rod 10, and the two ends of the reset spring 16 are also elastically abutted against the guide plate 5 and the moving iron core 15 respectively.

[0045] Furthermore, in this embodiment 1, a stop flange 130 is integrally formed on the inner wall of the frame of the coil winding 13 to limit / restrict the displacement of the moving iron core 15 and the magnetic sleeve 14 .

[0046] Example 2:

[0047] This embodiment 2 also provides an epoxy-sealed DC contactor, and compared with embodiment 1, the difference of the epoxy-sealed DC contactor in this embodiment 2 is that: ① In this embodiment 2, the micro switch 30 is fixedly connected to the inner wall of the arc extinguishing cover 4, which is different from embodiment 1.

[0048] Specifically, the structure of the arc extinguishing cover 4 used in this embodiment 2 is the same as that of the embodiment 1, both of which are: Figure 7 As shown, the arc-extinguishing cover 4 is provided with an arc-extinguishing cover 40 and an arc-extinguishing wall 41 fixedly connected to the underside of the arc-extinguishing cover 40. Based on this, in this second embodiment, the microswitch 30 is fixedly mounted on the inner side of the arc-extinguishing wall 41 and located below the movable contact piece 21. It is understood that the arc-extinguishing cover 40 described in this second embodiment is also provided with the through-hole B42 and the mounting hole.

[0049] Note: In addition to the above-mentioned differences, the specific implementation structure and mutual connection method of the electromagnetic drive mechanism, main contact structure, arc extinguishing cover 4, and guide plate 5 in the epoxy-sealed DC contactor described in this embodiment 2, the connection method between the top rod 31 and the push rod 10, the connection method between the micro switch 30, the lead terminal 32 and the control circuit board 33, etc. are all the same as those in Example 1; therefore, they will not be repeated here.

[0050] Finally, the suffixes "A", "B", etc. (such as perforation A, perforation B, etc.) of the component names in the specification of this utility model patent are only for the convenience of description and are not used to limit the scope of implementation of this utility model patent.

[0051] In summary, the epoxy-sealed DC contactor of the present invention has the characteristics of simple and reasonable structure, easy processing and manufacturing, low manufacturing cost, high synchronization and reliability during operation, etc., which well meets market demand.

[0052] In the above description, many specific details are set forth in order to fully understand the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person skilled in the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. An epoxy-sealed DC contactor, comprising an electromagnetic drive mechanism, a main contact structure, and an auxiliary switch structure, wherein the electromagnetic drive mechanism comprises a push rod (10) arranged vertically and a drive unit capable of driving the push rod (10) to move up and down, and the main contact structure comprises a stationary contact (20) and a movable contact piece (21) located below the stationary contact (20) and connected to the push rod (10); characterized in that: The auxiliary switch structure is provided with a micro switch (30) located below the movable contact piece (21) and a push rod (31) connected to the push rod (10) and located above the micro switch (30). When the push rod (10) drives the movable contact piece (21) and the static contact (20) to be attracted and connected, the push rod (31) can move synchronously with the push rod (10) to separate from the rocker (300) of the micro switch (30), and make the normally closed contact of the micro switch (30) in a closed state; and when the push rod (10) drives the movable contact piece (21) and the static contact (20) to be disconnected, the push rod (31) can press against the rocker (300) of the micro switch (30), and make the normally closed contact of the micro switch (30) in an open state.

2. The epoxy sealed DC contactor according to claim 1, characterized in that: The DC contactor further comprises an arc extinguishing hood (4), wherein the micro switch (30) is fixedly built into the arc extinguishing hood (4); The electromagnetic drive mechanism is further provided with an insulating seat (11) fixedly sleeved on the upper part of the push rod (10), and the push rod (31) is fixedly connected to the insulating seat (11).

3. The epoxy sealed DC contactor according to claim 2, characterized in that: The DC contactor further comprises a guide plate (5) fixedly connected to the lower side of the arc extinguishing cover (4), and the micro switch (30) is selectively fixedly connected to the inner wall of the arc extinguishing cover (4) or the guide plate (5).

4. The epoxy sealed DC contactor according to claim 3, characterized in that: The arc extinguishing cover (4) is provided with an arc extinguishing cover body (40) and an arc extinguishing wall body (41) fixedly connected to the lower side of the arc extinguishing cover body (40); a mounting hole for mounting the static contact (20) is provided through the arc extinguishing cover body (40); and the micro switch (30) is fixedly provided on the inner side of the arc extinguishing wall body (41).

5. The epoxy sealed DC contactor according to claim 3, characterized in that: The guide plate (5) is provided with a plate body (50) fixedly connected to the lower side of the arc extinguishing cover (4) and a receiving block (51) integrally provided on the upper side of the plate body (50); a through hole A (52) for the push rod (10) to move through is provided on the plate body (50); and the micro switch (30) is fixedly provided on the receiving block (51).

6. The epoxy sealed DC contactor according to claim 2, characterized in that: The insulating seat (11), the push rod (31) and the push rod (10) are fixedly connected into one body through an injection molding process.

7. The epoxy sealed DC contactor according to claim 5, characterized in that: The auxiliary switch structure is further provided with a lead-out terminal (32), and the lead-out terminal (32) is electrically connected to the normally closed contact of the micro switch (30).

8. The epoxy sealed DC contactor according to claim 7, characterized in that: The auxiliary switch structure is further provided with a control circuit board (33), and the micro switch (30) and the lead terminal (32) are respectively welded to the control circuit board (33) and electrically connected.

9. The epoxy sealed DC contactor according to claim 8, characterized in that: The arc extinguishing cover (4) is provided with a through hole B (42) for the lead terminal (32) to pass through; The control circuit board (33) is also fixedly arranged on the receiving block (51).

10. The epoxy sealed DC contactor according to claim 2, characterized in that: The upper portion of the push rod (10) is extended into the arc extinguishing cover (4), and the top end of the push rod (10) is located above the micro switch (30); The movable contact piece (21) is sleeved on the top end of the push rod (10), and a contact spring (6) capable of providing elastic supporting force to the movable contact piece (21) is also provided between the movable contact piece (21) and the insulating seat (11).

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