A high voltage DC contactor

Abstract

The present invention provides a high-voltage direct current contactor, comprising a moving contact assembly and a static contact, wherein the moving contact assembly comprises a transmission rod, a fixed bracket and a moving contact, wherein a slide groove for the moving contact to slide up and down and to limit the position is arranged on the upper part of the fixed bracket, the bottom of the fixed bracket and the upper part of the transmission rod are electrically insulated and fixedly connected together, a symmetrically arranged limiting part is arranged on the upper part of the fixed bracket to limit the position of the moving contact, and a spring is arranged between the bottom of the fixed bracket and the moving contact. The present invention limits the position of the moving contact through a symmetrical structure, ensures that the moving contact and the static contact are in stable contact, and has a small contact rebound, which is beneficial to improving the ability of the product's electrical life and mechanical life, and improves the performance of the contactor product.

Description

Technical Field

[0001] The invention belongs to the field of contactors, and in particular relates to a contactor for controlling a high-voltage direct current load. Background Art

[0002] A contactor is an electronic control device that has an input circuit and an output circuit. It is usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. It plays the role of automatic cutoff, safety protection, and circuit conversion in the circuit.

[0003] The patent with authorization announcement number CN201282083Y discloses a high-voltage DC contactor, which is also a high-voltage DC relay, and more specifically a vacuum relay, including a moving contact assembly, a static contact assembly, a driving mechanism containing an iron core (equivalent to an armature), a ceramic cavity, and an external magnetic circuit part; the driving mechanism includes a driving rod and an iron core (equivalent to an armature) that can move the driving rod under the action of the external magnetic circuit part; the moving contact assembly, the static contact, and the driving mechanism are completely sealed in a vacuum cavity formed by the ceramic cavity and are located in corresponding positions, the moving contact assembly and the iron core (equivalent to the armature) are respectively connected to the two ends of the driving rod (equivalent to the transmission rod), and a ceramic insulator is slidably connected at the junction of the moving contact assembly and the driving rod to achieve good electrical insulation between the moving contact assembly and the driving rod (equivalent to the transmission rod) and the iron core (equivalent to the armature). This structure utilizes the good vacuum performance and electrical insulation performance of ceramic insulator parts to ensure that the moving contact and the static contact maintain good electrical insulation from the magnetic circuit system composed of the relay's magnetic yoke iron plate, iron core (equivalent to the armature) and other parts in any state of conduction or disconnection, thereby ensuring the relay's arc-breaking ability when switching DC high voltage loads.

[0004] like Figure 1 As shown, in the prior art, the first moving contact 1 of the contactor is often fixed on the transmission rod 3, and the transmission rod 3 drives the first moving contact 1 to move through electromagnetic attraction and spring restoring force to achieve the attraction and disconnection of the first moving contact 1 and the static contact. The first moving contact 1 is often fixed to the transmission rod 3 by an E-type retaining spring 2. Although it is easy to operate, there is a gap in the structure of the E-type retaining spring 2, that is, it is a single-arm fixing method. In this way, the parallelism of the first moving contact 1 after assembly is poor. When the moving contact is disconnected, the reverse force of the spring will be completely concentrated on the E-type retaining spring 2. The E-type retaining spring 2 is unevenly stressed, which causes the contact to deform after repeated attraction and disconnection, and then causes the relative position of the first moving contact 1 of the product to change, that is, looseness or rotation occurs. At this time, it is difficult to ensure that the two ends of the first moving contact 1 are in contact with the corresponding static contacts at the same time, resulting in a large contact rebound, which reduces the electrical life and mechanical life of the first moving contact 1; there is even a situation where the E-type retaining spring 2 falls off, and the first moving contact 1 falls off, causing the contactor to fail. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a high-voltage DC contactor, wherein the contactor is provided with a fixed bracket, and a slide groove is provided on the upper part of the bracket for the moving contact to slide up and down and play a limiting role. The lower part of the bracket is fixedly connected to the upper part of the transmission rod in an electrically insulated manner. The upper part of the bracket limits the position of the moving contact by setting a limiting part (which can be a double-arm structure, that is, a symmetrically arranged structure), thereby ensuring that the moving contact and the static contact are in stable contact and the contact bounces back little, which is beneficial to improving the ability of the product's electrical life and mechanical life, and improving the performance of the contactor product.

[0006] The present invention is achieved through the following technical solutions:

[0007] A high-voltage DC contactor comprises a moving contact assembly and a static contact. The moving contact assembly comprises a transmission rod, a fixed bracket and a moving contact. A slide groove is arranged on the upper part of the fixed bracket for the moving contact to slide up and down and to limit the position. The bottom of the fixed bracket is electrically insulated from the upper part of the transmission rod and is fixedly connected together. A symmetrically arranged limiting part is arranged on the upper part of the fixed bracket to limit the position of the moving contact. A spring is arranged between the bottom of the fixed bracket and the moving contact.

[0008] Furthermore, the fixed bracket includes two symmetrically arranged side walls and a bottom, the bottom is a bottom plate, the two side walls are relatively connected to the two sides of the bottom plate, the upper part of each side wall is provided with a snap hole, which is the slide groove, and the upper edge of the two snap holes is the symmetrically arranged limit part, the bottom plate is fixedly connected to the upper end of the transmission rod, and bosses are provided on both sides of the moving contact, and the bosses are installed in the snap holes. Compared with the prior art, the moving contact is fixed with two arms, that is, a symmetrical structure, which increases the parallelism of the moving contact after assembly, and ensures that the electrical contact between the two ends of the moving contact and the static contact of the contactor product is reliable and stable when the contactor product is attracted, thereby ensuring smooth movement of the product and no abnormality in action, and the moving contact and the static contact are in stable contact, and the contact rebound is small, which is conducive to improving the ability of the product to have a long life and a long mechanical life, and improves the performance of the contactor product using the moving contact assembly.

[0009] Furthermore, the moving contact is provided with a truncated cone, and the spring is a first spring arranged between the moving contact and the base plate, the upper end of the first spring is fitted with the moving contact, and the upper end of the first spring is sleeved on the outer ring of the truncated cone to limit the shaking of the first spring and improve the stability of the moving contact, the lower end of the first spring is fitted with the base plate, and the lower end of the first spring is sleeved on the outer end of the upper end of the transmission rod, when the contactor is powered off, under the action of the elastic force of the first spring, the moving contact is ensured to be in stable pre-pressure contact with the upper edge of the buckle hole of the fixed bracket, thereby ensuring the stability of the pressure contact between the moving contact and the static contact when the contactor is powered on.

[0010] Furthermore, in order to solve the insulation problem between the fixed bracket and the transmission rod, a solution is as follows: the moving contact assembly is also provided with an insulating plate and an insulating ring, a through hole is opened in the center of the insulating plate, the insulating ring structure is a circular ring, the transmission rod is a cylinder, and an outwardly protruding limiting cone is arranged near the end surface of the upper part of the transmission rod, the upper end of the transmission rod is sleeved with an insulating plate and an insulating ring, the insulating plate is fitted with the upper end surface of the limiting cone, the inner ring of the insulating plate is provided with a ring table, a hole is opened in the center of the bottom plate, the hole covers the outer ring of the ring table, the insulating ring is fitted with the upper end surface of the ring table, the insulating plate and the insulating ring isolate the transmission rod from the bottom plate, and ensure the insulation and voltage resistance performance between the transmission rod and the bottom plate, the lower end of the first spring is sleeved on the outside of the insulating ring, on the one hand, the shaking of the first spring is limited, and the stability of the moving contact is improved, on the other hand, the insulating ring isolates the first spring from the transmission rod, and ensures the insulation and voltage resistance performance between the first spring and the transmission rod, and realizes the high-voltage load capacity of the product. The height of the ring platform is equal to the thickness of the base plate, which ensures good isolation between the base plate and the transmission rod, thereby ensuring insulation and voltage resistance between the transmission rod and the base plate. Another solution is: the height of the ring platform is set to be greater than the thickness of the base plate, and a step hole is provided at the lower end of the insulating ring. The step hole covers the outer ring of the ring platform, and an extended creepage path is formed between the transmission rod and the base plate, which increases the creepage path distance, further improves the voltage resistance performance, and improves the high-voltage load capacity of the contactor product. Another solution is: a convex ring is provided at the lower end of the insulating ring, and the inner ring of the convex ring covers the outer ring of the ring platform, and the hole covers the outer ring of the convex ring. An extended creepage path is formed between the transmission rod and the base plate, which increases the creepage path distance, further improves the voltage resistance performance, and improves the high-voltage load capacity of the contactor product.

[0011] Furthermore, the outer diameter of the insulating ring is larger than the outer diameter of the ring stage, thereby ensuring that the bottom plate is clamped between the insulating plate and the insulating ring.

[0012] Furthermore, a countersunk hole is provided at the upper end of the insulating ring, and a welding ring is provided in the countersunk hole. The welding ring is welded and fixed to the upper end of the transmission rod, so that the insulating plate and the insulating ring are fixed to the upper end of the transmission rod, and the base plate clamped between the insulating plate and the insulating ring is fixed to the upper end of the transmission rod, and then the moving contact is fixed to the upper end of the transmission rod, so that the moving contact moves with the transmission rod.

[0013] Furthermore, the upper portion of the side wall where the buckle hole is located is bent outwards to facilitate inserting the bosses on both sides of the moving contact into the buckle hole.

[0014] Furthermore, the contactor also includes an iron core and a second spring. A through hole is opened in the center of the iron core. An annular groove matching the limiting cone is arranged at the upper end of the through hole of the iron core. The transmission rod is inserted into and passes through the through hole of the iron core. The lower end of the transmission rod is fixedly connected to the armature. The second spring is arranged between the armature and the iron core. A static contact is arranged above the moving contact.

[0015] The beneficial effects of the present invention are:

[0016] Compared with the prior art, the position of the moving contact is limited by a symmetrical structure, which ensures that the bridge contact of the product is reliable and stable when it is attracted, thereby ensuring smooth movement of the product and no abnormality in action. In addition, the moving contact and the static contact are in stable contact, and the contact rebound is small, which is beneficial to improving the ability of the product's electrical life and mechanical life, and improving the performance of the contactor product. A spring is arranged between the moving contact and the bottom of the fixed bracket. Under the action of the spring elastic force, the moving contact and the fixed bracket are in stable contact, thereby ensuring the stability of the contact contact. An insulating plate and an insulating ring are arranged to isolate the transmission rod from the bottom plate, ensuring the insulation and voltage resistance performance between the transmission rod and the bottom plate, and realizing the high-voltage load capacity of the contactor product. An extended creepage path is arranged to increase the creepage path distance between the transmission rod and the bottom plate, further improving the voltage resistance performance, thereby improving the high-voltage load capacity of the contactor product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a contactor moving contact assembly in the prior art;

[0018] Figure 2 This is a schematic diagram of the structure of the moving contact assembly in the first embodiment of the present invention;

[0019] Figure 3 is a cross-sectional view of a moving contact assembly in Embodiment 1 of the present invention;

[0020] Figure 4 for Figure 3 The enlarged view of point Ⅰ in the middle;

[0021] Figure 5 This is a schematic diagram of the structure of the fixing bracket in the first embodiment of the present invention;

[0022] Figure 6 Schematic diagram of the structure of the moving contact in the first embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of the insulating plate in the first embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of the insulating ring in the first embodiment of the present invention;

[0025] Fig. 9 is a cross-sectional view of a moving contact assembly in Embodiment 2 of the present invention;

[0026] Fig.10 It is a schematic diagram of the structure of the insulating ring in the second embodiment of the present invention;

[0027] Fig.11 is a cross-sectional view of the moving contact assembly in the third embodiment of the present invention;

[0028] Fig.12 This is a schematic diagram of the structure of the insulating ring in the third embodiment of the present invention;

[0029] Fig.13 Schematic diagram of the structure of the contactor in the fourth embodiment of the present invention.

[0030] In the figure: 1-first moving contact, 2-E-type retaining spring, 3-transmission rod, 4-fixed bracket, 5-moving contact, 6-first spring, 7-insulating plate, 8-insulating ring, 9-welding ring, 10-iron core, 11-second spring, 12-armature,

[0031] 301-limited round table,

[0032] 401-side wall, 402-bottom plate, 403-clip hole, 404-hole,

[0033] 501- boss, 502- round table,

[0034] 701-Ring Taiwan,

[0035] 801-counterbore, 802-step hole, 803-convex ring. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are further described below in conjunction with the accompanying drawings, but the scope of protection claimed is not limited to the embodiments described above.

[0037] Embodiment 1

[0038] like Figures 2 to 8 As shown, a moving contact assembly includes a transmission rod 3, a fixed bracket 4 and a moving contact 5. The fixed bracket 4 includes two side walls 401 and a bottom plate 402. The two side walls 401 are relatively connected to the two sides of the bottom plate 402. The upper part of the side wall 401 is provided with a buckle hole 403. The bottom plate 402 is fixedly connected to the upper end of the transmission rod 3. Bosses 501 are provided on both sides of the moving contact 5, and the bosses 501 are inserted into the buckle holes 403. The moving contact 5 is fixed by two arms, that is, the position is limited in a symmetrical manner on both sides, which increases the parallelism of the moving contact 5 after assembly, ensures that the bridge contact of the product is reliable and stable when it is attracted, and further ensures that the product moves smoothly and the action is normal. In addition, the moving contact 5 is in stable contact with the static contact, and the contact rebound is small, which is conducive to improving the ability of the product's electrical life and mechanical life, and improves the product performance.

[0039] The moving contact 5 is provided with a truncated cone 502, and a first spring 6 is provided between the moving contact 5 and the bottom plate 402. The upper end of the first spring 6 is in contact with the moving contact 5, and the upper end of the first spring 6 is sleeved on the outer ring of the truncated cone 502 to limit the shaking of the first spring 6 and improve the stability of the moving contact 5. The lower end of the first spring 6 is in contact with the bottom plate 402, and the lower end of the first spring 6 is sleeved on the outer end of the upper end of the transmission rod 3. Under the action of the spring elastic force, the moving contact 5 is ensured to be in stable contact with the fixed bracket 4, thereby ensuring the stability of the contact.

[0040] The assembly also includes an insulating plate 7 and an insulating ring 8. A through hole is provided at the center of the insulating plate 7. The insulating ring 8 is a circular ring. The transmission rod 3 is a cylinder. A limiting truncated platform 301 protruding outward is provided at the upper part of the transmission rod 3 near the end surface. The upper end of the transmission rod 3 is sleeved with the insulating plate 7 and the insulating ring 8. The insulating plate 7 is fitted with the upper end surface of the limiting truncated platform 301. The inner circle of the insulating plate 7 is provided with a ring platform 701. A hole 404 is provided at the center of the bottom plate 402. The hole 404 covers the outer circle of the ring platform 701. The edge ring 8 is fitted with the upper end surface of the ring platform 701, and the insulating plate 7 and the insulating ring 8 isolate the transmission rod 3 from the bottom plate 402 to ensure the insulation and voltage resistance between the transmission rod 3 and the bottom plate 402. The lower end of the first spring 6 is sleeved on the outside of the insulating ring 8. On the one hand, it limits the shaking of the first spring 6 and improves the stability of the moving contact. On the other hand, the insulating ring 8 isolates the first spring 6 from the transmission rod 3 to ensure the insulation and voltage resistance between the first spring 6 and the transmission rod 3, thereby realizing the high-voltage load capacity of the product.

[0041] The height of the ring platform 701 is equal to the thickness of the bottom plate 402 , which ensures good isolation between the bottom plate 402 and the transmission rod 3 , thereby ensuring insulation and voltage resistance between the transmission rod 3 and the bottom plate 402 .

[0042] The outer diameter of the insulating ring 8 is larger than the outer diameter of the ring stage 701 , ensuring that the bottom plate 402 is sandwiched between the insulating plate 7 and the insulating ring 8 .

[0043] The upper end of the insulating ring 8 is provided with a countersunk hole 801, in which a welding ring 9 is provided. The welding ring 9 is welded and fixed to the upper end of the transmission rod 3, so that the insulating plate 7 and the insulating ring 8 are fixed to the upper end of the transmission rod 3, and the bottom plate 402 clamped between the insulating plate 7 and the insulating ring 8 is fixed to the upper end of the transmission rod 3, and then the moving contact 5 is fixed to the upper end of the transmission rod 3, so that the moving contact 5 moves with the transmission rod 3.

[0044] The upper portion of the side wall 401 where the buckle hole 403 is located is bent outwards, so as to facilitate the insertion of the bosses 501 on both sides of the moving contact 5 into the buckle hole 403 .

[0045] Embodiment 2

[0046] like Fig. 9 , Fig.10 As shown, based on the structure of the first embodiment, the structure of the insulating ring 8 is changed as follows:

[0047] A step hole 802 is provided at the lower end of the insulating ring 8, and the step hole 802 covers the outer ring of the ring platform 701. The height of the ring platform 701 is greater than the thickness of the bottom plate 402. An extended creepage path is formed between the transmission rod 3 and the bottom plate 402, which increases the creepage path distance, further improves the voltage resistance performance, and improves the high-voltage load capacity of the product.

[0048] Embodiment 3

[0049] like Fig.11 , Fig.12 As shown, based on the structure of the first embodiment, the structure of the insulating ring 8 is changed as follows:

[0050] A convex ring 803 is provided at the lower end of the insulating ring 8, the inner ring of the convex ring 803 is sleeved on the outer ring of the ring platform 701, and the hole 404 is sleeved on the outer ring of the convex ring 803, forming an extended creepage path between the transmission rod 3 and the bottom plate 402, increasing the creepage path distance, further improving the voltage resistance performance, and improving the high-voltage load capacity of the product.

[0051] Embodiment 4

[0052] like Fig.13 As shown, the present invention also provides a contactor including any one of the moving contact assembly described in embodiments 1 to 3, further including an iron core 10, a second spring 11 and an armature 12, a through hole is opened in the center of the iron core 10, an annular groove matching the limiting truncated cone 301 is arranged at the upper end of the through hole of the iron core 10, a transmission rod 3 is inserted into and passes through the through hole of the iron core 10, a lower end of the transmission rod 3 is fixedly connected to the armature 12, a second spring 11 is arranged between the armature 12 and the iron core 10, a static contact is arranged above the moving contact 5, and the product coil is not added When the contactor coil is powered, under the elastic force of the second spring, the limiting cone 301 fits against the bottom of the annular groove of the iron core 10, the moving contact 5 does not contact the static contact, and is in a disconnected state; when the contactor coil is powered, under the magnetic force of the coil, the armature 12 moves toward the iron core 10, driving the moving contact 5 to move upward, and making the moving contact 5 contact the static contact, completing the attraction process; when the contactor coil is de-energized, the magnetic force of the coil disappears, and under the elastic force of the second spring 11, the moving contact 5 is disconnected from the static contact, and returns to the disconnected state.

[0053] The present invention provides a moving contact assembly, which fixes the moving contact through a double-arm structure, ensuring that the bridge contact of the product is reliable and stable when it is attracted, thereby ensuring smooth movement of the product and no abnormality in action, and the moving contact is in stable contact with the static contact, and the contact rebound is small, which is beneficial to improving the electrical life and mechanical life of the product and improving the product performance. A spring is arranged between the moving contact and the fixed bracket, and under the action of the spring elastic force, the moving contact is ensured to be in stable contact with the fixed bracket, thereby ensuring the stability of the contact contact. An insulating plate and an insulating ring are arranged to isolate the transmission rod from the bottom plate, thereby ensuring the insulation and voltage resistance performance between the transmission rod and the bottom plate, and realizing the high-voltage load capacity of the product. An extended creepage path is arranged to increase the creepage path distance between the transmission rod and the bottom plate, further improving the voltage resistance performance, thereby improving the high-voltage load capacity of the product.

Claims

1. A high voltage DC contactor, comprising a moving contact assembly and a stationary contact, characterized in that: The moving contact assembly includes a transmission rod, a fixed bracket and a moving contact. The upper part of the fixed bracket is provided with a slide groove for the moving contact to slide up and down and to limit the position. The bottom of the fixed bracket and the upper part of the transmission rod are electrically insulated and fixedly connected together. The upper part of the fixed bracket is provided with symmetrically arranged limit parts to limit the position of the moving contact. A spring is provided between the bottom of the fixed bracket and the moving contact. The fixing bracket includes two symmetrically arranged side walls and a bottom, the bottom is a bottom plate, the two side walls are relatively connected to the two sides of the bottom plate, the upper part of each side wall is provided with a buckle hole, which is the slide groove, and the upper edge of the two buckle holes is the symmetrically arranged limiting part, the bottom plate is fixedly connected to the upper end of the transmission rod, and bosses are provided on both sides of the moving contact, and the bosses are installed in the buckle holes. The moving contact is provided with a truncated cone, the spring is a first spring provided between the moving contact and the bottom plate, the upper end of the first spring is fitted with the moving contact, the upper end of the first spring is sleeved on the outer ring of the truncated cone, the lower end of the first spring is fitted with the bottom plate, and the lower end of the first spring is sleeved outside the upper end of the transmission rod. The moving contact assembly is also provided with an insulating plate and an insulating ring, a through hole is opened in the center of the insulating plate, the insulating ring structure is a circular ring, the transmission rod is a cylinder, an outwardly protruding limiting cone is arranged near the end face of the upper part of the transmission rod, the upper end of the transmission rod is sleeved with an insulating plate and an insulating ring, the insulating plate is fitted with the upper end face of the limiting cone, the inner ring of the insulating plate is provided with a ring platform, a hole is opened in the center of the bottom plate, the hole covers the outer ring of the ring platform, the insulating ring is fitted with the upper end face of the ring platform, and the insulating plate and the insulating ring separate the transmission rod from the bottom plate.

2. The contactor according to claim 1, characterized in that: The height of the ring platform is equal to the thickness of the bottom plate.

3. The contactor according to claim 1, characterized in that: The height of the ring platform is set to be greater than the thickness of the bottom plate, and a step hole is set at the lower end of the insulating ring, and the step hole covers the outer ring of the ring platform.

4. The contactor according to claim 1, characterized in that: A convex ring is arranged at the lower end of the insulating ring, the inner ring of the convex ring is sleeved around the outer ring of the ring platform, and the hole is sleeved around the outer ring of the convex ring.

5. The contactor according to any one of claims 1, 3 and 4, characterized in that: The outer diameter of the insulating ring is larger than the outer diameter of the ring stage.

6. The contactor according to claim 5, characterized in that: The upper end of the insulating ring is provided with a countersunk hole, in which a welding ring is provided, and the welding ring is fixed to the upper end of the transmission rod by welding.

7. The contactor according to claim 6, characterized in that: The upper part of the side wall where the buckle hole is located is bent outwards.

8. The contactor according to claim 6, characterized in that: The contactor also includes an iron core, a second spring and an armature. A through hole is opened in the center of the iron core. An annular groove matching the limiting cone is arranged at the upper end of the through hole of the iron core. The transmission rod is inserted into and passes through the through hole of the iron core. The armature is fixedly connected to the lower end of the transmission rod. The second spring is arranged between the armature and the iron core. The static contact is arranged above the moving contact.

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