Pushing assembly of direct current contactor

Abstract

The utility model discloses a pushing assembly of a direct current contactor, which is used for pushing a moving contact in the direct current contactor to move, and comprises a push rod, an insulating base, a contact spring and a rectangular frame-shaped support, the insulating base is formed by injection molding of plastic materials and integrally wraps the bottom of the support and the upper end of the push rod, and the contact spring is arranged on the insulating base. A spring positioning groove is formed in the top of the insulating base, one end of the contact spring is located in the spring positioning groove, the movable contact piece is arranged in the support in a penetrating mode and is upwards attached to the inner top wall of the support under the elastic force effect of the contact spring, a through hole is formed in the top of the support, and the through hole and the spring positioning groove are distributed in an up-down opposite mode. The size of the through hole is larger than that of the spring positioning groove, and the contact spring can penetrate through the through hole to be arranged in the spring positioning groove. According to the utility model, the complexity of the injection mold for molding the insulating base can be reduced, the injection mold is convenient to demold, the contact spring is convenient to assemble, and the product assembly efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to contactor technical field, especially a kind of pusher assembly of direct current contactor. BACKGROUND

[0002] Direct current contactor has wide application in electrical control field, and its performance and reliability directly affect the operation of entire electrical system, and pusher assembly is one of the key structures of direct current contactor, responsible for realizing the operation of closing and opening of direct current contactor. The pusher assembly of direct current contactor generally includes push rod, insulating base, bracket and spring, the push rod is connected to the electromagnetic mechanism of direct current contactor, for transmitting power;The insulating base is connected to the push rod and bracket, for isolating high and low voltage;Bracket is used to support and limit moving contact;The elastic force of spring can ensure that moving contact and static contact maintain sufficient and stable contact pressure, to ensure the stability and reliability of direct current contactor.

[0003] At present, there are some significant problems in the design and manufacturing process of the existing pusher assembly of direct current contactor. Since the insulating base in the pusher assembly is generally integrally formed between the push rod and the bracket by injection molding process, and a positioning groove for positioning the spring needs to be formed on the insulating base at the same time, the existing pusher assembly structure needs to be matched with a sliding block for side core pulling during demolding, which leads to complex design of injection mold, and difficult demolding, and the spring of the existing pusher assembly can only be assembled from one side of the bracket after being compressed with the help of tools, so the spring assembly is also very difficult. Therefore, it is necessary to improve the existing technology to overcome the defects in the prior art. UTILITY MODEL CONTENTS

[0004] The problem to be solved by the utility model is to provide a pusher assembly of direct current contactor to overcome the defects of complex design of injection mold, difficult demolding and difficult assembly of product caused by the structure of the existing pusher assembly of direct current contactor.

[0005] The utility model employs the technical scheme that in order to solve the technical problem, a pusher assembly of direct current contactor is used to push the moving contact in the direct current contactor to move, which comprises: push rod, insulating base, contact spring and bracket in the shape of rectangular frame, the insulating base is integrally covered on the bottom of the bracket and the upper end of the push rod by injection molding of plastic material, and the top of the insulating base is provided with spring positioning groove, one end of the contact spring is located in the spring positioning groove, the moving contact is arranged in the bracket and adheres to the inner top wall of the bracket under the elastic force of the contact spring, the top of the bracket is provided with through hole, the through hole and the spring positioning groove are distributed opposite to each other, and the size of the through hole is larger than that of the spring positioning groove, and the contact spring can pass through the through hole and be placed in the spring positioning groove.

[0006] As a further improvement of this utility model, the bracket is provided with an upper stop plate, a lower embedded cover plate, and side connecting plates connected to both sides of the upper stop plate and the lower embedded cover plate. The through hole is located in the middle of the upper stop plate, and the lower embedded cover plate is covered in the insulating base.

[0007] As a further improvement of this utility model, the lower embedded cover plate is provided with a bearing portion exposed from the spring positioning groove, and one end of the contact spring elastically abuts against the bearing portion.

[0008] As a further improvement of this utility model, the upper end of the push rod is in the shape of an "I", and the upper end of the push rod is inserted into the central hole of the lower embedded cover plate without contacting each other. The insulating base is provided with a protrusion that wraps around the upper end of the push rod, and the protrusion is located in the spring positioning groove.

[0009] As a further improvement of this utility model, the bracket is integrally stamped from a metal plate, wherein the lower embedded cover plate is spliced ​​from the two bent ends of the metal plate.

[0010] As a further improvement of this utility model, the driving assembly of the DC contactor also includes a lower armature, which is installed at the bottom of the moving contact piece.

[0011] As a further improvement of this utility model, the lower armature is U-shaped, and the two opposite side plates of the lower armature are attached to the two corresponding vertical surfaces of the moving contact piece. The side connecting plate is provided with a clearance window for the side plates of the lower armature to pass through.

[0012] As a further improvement of this utility model, the bottom of the lower armature is provided with a limiting groove, and the other end of the contact spring is located in the limiting groove.

[0013] As a further improvement of this utility model, the bracket has a channel running through its left and right sides, the movable contact piece is transversely inserted into the channel, and both ends of the movable contact piece extend outward from the bracket.

[0014] As a further improvement of this utility model, the through hole is circular, rectangular or polygonal.

[0015] The utility model discloses a push assembly of direct current contactor, through setting up through -hole on the top of support, and the size of through -hole is greater than the size of spring positioning groove, in this way, in the injection mold for forming insulating base, through setting up an insert for forming spring positioning groove on the front mould or rear mould, after injection molding, the insert directly withdraws from the through -hole of support, makes the injection mold stripping very convenient, also greatly reduced the complexity of injection mold, reduced the cost and time of mould development, and the contact spring can be from top to bottom through the through -hole and place in spring positioning groove, also facilitated the assembly of contact spring, improve product assembly efficiency, reduce assembly time and manpower cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the sectional view of push assembly of direct current contactor of the utility model;

[0017] Figure 2 It is the sectional view of push assembly of direct current contactor of the utility model;

[0018] Figure 3 It is the exploded view of push assembly of direct current contactor of the utility model;

[0019] Figure 4 It is the stereogram of insulating base and support in the utility model;

[0020] Figure 5 It is the stereogram of support in the utility model.

[0021] The following description is made in conjunction with the accompanying drawings:

[0022] 1, moving contact piece;2, push rod;3, insulating base;301, spring positioning groove;

[0023] 302, convex hull;4, contact spring;5, support;501, upper stop plate;5011, through -hole;502, lower buried cover plate;5021, bearing part;5022, center hole;503, side connecting plate;5031, avoid position window;6, lower armature;601, limit groove. DETAILED DESCRIPTION

[0024] The following description is made in conjunction with the accompanying drawings:

[0025] The utility model provides a kind of push assembly of direct current contactor, the push assembly is used to when the electromagnetic mechanism of direct current contactor is powered or powered off, push moving contact piece 1 in direct current contactor moves, to make moving contact piece 1 and the static contact of direct current contactor close or break, realize the on-off control of direct current contactor access loop.

[0026] Refer to Figures 1 to 5The pushing assembly of the DC contactor comprises a pushing rod 2, an insulating base 3, a contact spring 4 and a bracket 5 in the shape of a rectangular frame.

[0027] The pushing rod 2, the contact spring 4 and the bracket 5 are all made of metal, and the insulating base 3 is made of plastic.

[0028] Specifically, during the injection molding process, the pushing rod 2 and the bracket 5 are first embedded into the injection mold, then the mold is closed and molten plastic is injected into the mold cavity, the plastic covers the bottom of the bracket 5 and the upper end of the pushing rod 2, and after cooling and forming, the pushing rod 2, the insulating base 3 and the bracket 5 are integrated.

[0029] In addition, the insulating base 3 is further formed with a spring positioning groove 301 at the top thereof, the contact spring 4 is arranged in the bracket 5, and the lower end of the contact spring 4 is located in the spring positioning groove 301.

[0030] As shown in Figs. Figure 1 and Figure 2 , the movable contact 1 is arranged in the bracket 5 and is upwardly attached to the inner top wall of the bracket 5 under the elastic force of the contact spring 4. The top of the bracket 5 is provided with a through hole 5011, the through hole 5011 and the spring positioning groove 301 are arranged in an upper and lower relationship, and the size of the through hole 5011 is greater than that of the spring positioning groove 301, so that the contact spring 4 can pass through the through hole 5011 and be arranged in the spring positioning groove 301.

[0031] The through hole 5011 is provided at the top of the bracket 5, and the size of the through hole 5011 is greater than that of the spring positioning groove 301, so that in the injection mold used for forming the insulating base 3, a insert for forming the spring positioning groove 301 is arranged on the front mold or the rear mold, after injection molding, the insert directly exits from the through hole 5011 of the bracket 5, which makes the demolding of the injection mold very convenient, greatly reduces the complexity of the injection mold, reduces the cost and time of mold development, and at the same time, the contact spring 4 can pass through the through hole 5011 from top to bottom and be arranged in the spring positioning groove 301, which facilitates the assembly of the contact spring 4, improves the product assembly efficiency, and reduces the assembly time and labor cost.

[0032] It can be understood that the shape of the through hole 5011 is not limited in the utility model, as long as the size thereof is greater than that of the spring positioning groove 301, that is, the projection of the spring positioning groove 301 in the vertical direction can completely fall into the through hole 5011 upwardly.

[0033] See Figure 4 and Figure 5 The bracket 5 is provided with an upper stop plate 501, a lower embedded cover plate 502, and a side connecting plate 503 connecting the upper stop plate 501 and the lower embedded cover plate 502. The upper stop plate 501 and the lower embedded cover plate 502 are arranged vertically opposite each other. A through hole 5011 is located in the middle of the upper stop plate 501, and the lower embedded cover plate 502 is enclosed in the insulating base 3. Side connecting plates 503 are connected to both the front and rear sides of the upper stop plate 501 and the lower embedded cover plate 502, thus forming a channel running through the left and right sides inside the bracket 5. The moving contact piece 1 is transversely inserted into the channel, and both ends of the moving contact piece 1 extend outward from the bracket 5 to facilitate connection with the two stationary contacts of the DC contactor.

[0034] See Figure 2 and Figure 4 The lower cover plate 502 is provided with a support portion 5021 exposed from the spring positioning groove 301, and the lower end of the contact spring 4 elastically abuts against the support portion 5021. This utility model uses a metal support portion 5021 to support the contact spring 4, which is not easy to wear and will not produce foreign objects, thus avoiding foreign objects falling into the contact position of the DC contactor and causing non-conductivity.

[0035] See Figure 2 , Figure 3 and Figure 5 The upper end of the push rod 2 is in the shape of an "I". The upper end of the push rod 2 passes through the center hole 5022 of the lower embedded cover plate 502. The push rod 2 and the bracket 5 do not contact each other. The insulating base 3 is provided with a protrusion 302 that wraps around the upper end of the push rod 2 to strengthen the high and low voltage insulation between the bracket 5 and the push rod 2. At the same time, the protrusion 302 is located in the spring positioning groove 301, and the lower end of the contact spring 4 is sleeved on the outside of the protrusion 302, which can also play a certain limiting role for the contact spring 4.

[0036] like Figure 5 As shown, the bracket 5 in this utility model is integrally stamped from a metal plate, and the lower embedded cover plate 502 is formed by splicing two bent ends of the metal plate. In addition, the lower embedded cover plate 502 is provided with multiple reinforcing holes. During injection molding, molten plastic fills the reinforcing holes to increase the strength of the connection between the insulating base 3 and the bracket 5.

[0037] See Figure 1The utility model discloses a push assembly of direct current contactor still includes lower armature 6, and lower armature 6 is U-shaped, and is clamped in the bottom of movable contact piece 1 upwards, and the two opposite side plates of lower armature 6 are respectively attached on the two corresponding vertical surfaces of movable contact piece 1, wherein, the side connecting plate 503 of support 5 is equipped with the position window 5031 that the side plate of lower armature 6 passes through. The two opposite side plates of lower armature 6 also stretch out the top surface of movable contact piece 1 upwards, for with the upper armature in direct current contactor cooperation uses. When the current flows through movable contact piece 1, under the magnetic field generated around movable contact piece 1, lower armature 6 and upper armature generate mutual suction, to provide the upward compensation force for movable contact piece 1, improve the short-circuit resistance of direct current contactor.

[0038] As Figure 2 The bottom of lower armature 6 is equipped with limiting groove 601, and the upper end of contact spring 4 is elastically abutted in limiting groove 601, and then contact spring 4 can always exert the upward elastic force on movable contact piece 1 through lower armature 6.

[0039] Of course, in certain embodiments of the utility model, the push assembly of direct current contactor can also not contain lower armature 6, and the upper end of contact spring 4 can directly elastically abut on the bottom of movable contact piece 1.

[0040] It can be seen that the push assembly of direct current contactor of the utility model is provided with through hole 5011 on the top of support 5, and the size of through hole 5011 is greater than the size of spring positioning groove 301, so in the injection mold for forming insulating base 3, by setting a insert for forming spring positioning groove 301 on the front mold or rear mold, after injection molding, the insert directly exits from the through hole 5011 of support 5, so that the injection mold stripping is very convenient, and the complexity of injection mold is greatly reduced, the cost and time of mold development are reduced, and at the same time, the contact spring 4 can pass through the through hole 5011 from top to bottom and be placed in the spring positioning groove 301, which facilitates the assembly of the contact spring 4, improves the product assembly efficiency, and reduces the assembly time and labor cost.

[0041] In the above description, many specific details are set forth in order to fully understand the utility model. However, the above description is only the preferred embodiment of the utility model, and the utility model can be implemented in many other ways different from the description, so the utility model is not limited by the above disclosed specific implementation. Meanwhile, any person skilled in the art can make many possible changes and modifications to the utility model technical scheme disclosed above or modify equivalent embodiments with equivalent changes without departing from the scope of the utility model technical scheme. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the utility model, all still belong to the protection scope of the utility model technical scheme.

Claims

1. A push assembly of a DC contactor for pushing a moving contact (1) to move in the DC contactor, comprising: The device comprises a push rod (2), an insulating base (3), a contact spring (4), and a rectangular frame-shaped bracket (5). The insulating base (3) is injection molded from plastic and integrally covers the bottom of the bracket (5) and the top of the push rod (2). The top of the insulating base (3) is provided with a spring positioning groove (301). One end of the contact spring (4) is located in the spring positioning groove (301). The movable contact piece (1) passes through the bracket (5) and abuts against the inner top wall of the bracket (5) under the elastic force of the contact spring (4). The device is characterized in that: the top of the bracket (5) is provided with a through hole (5011). The through hole (5011) and the spring positioning groove (301) are distributed vertically opposite to each other. The size of the through hole (5011) is larger than the size of the spring positioning groove (301). The contact spring (4) can pass through the through hole (5011) and be placed in the spring positioning groove (301).

2. The push assembly of a DC contactor of claim 1, wherein: The bracket (5) is provided with an upper stop plate (501), a lower embedded cover plate (502) and a side connecting plate (503) connecting the upper stop plate (501) and the lower embedded cover plate (502) on both sides. The through hole (5011) is located in the middle of the upper stop plate (501), and the lower embedded cover plate (502) is covered in the insulating base (3).

3. The push assembly of a DC contactor of claim 2, wherein: The lower cover plate (502) is provided with a bearing portion (5021) exposed from the spring positioning groove (301), and one end of the contact spring (4) elastically abuts against the bearing portion (5021).

4. The push assembly of a DC contactor of claim 2, wherein: The upper end of the push rod (2) is in the shape of an "I". The upper end of the push rod (2) is inserted into the center hole (5022) of the lower embedded cover plate (502) and does not contact each other. The insulating base (3) is provided with a protrusion (302) that wraps around the upper end of the push rod (2). The protrusion (302) is located in the spring positioning groove (301).

5. The push assembly of a DC contactor of claim 2, wherein: The bracket (5) is integrally stamped from a metal plate, wherein the lower embedded cover plate (502) is spliced ​​from the two bent ends of the metal plate.

6. The push assembly of a DC contactor of claim 2, wherein: It also includes a lower armature (6), which is mounted on the bottom of the movable contact piece (1).

7. The push assembly of a DC contactor of claim 6, wherein: The lower armature (6) is U-shaped, and the two opposite side plates of the lower armature (6) are attached to the two corresponding vertical surfaces of the moving contact plate (1). The side connecting plate (503) is provided with a clearance window (5031) for the side plates of the lower armature (6) to pass through.

8. The push assembly of a DC contactor of claim 6, wherein: The bottom of the lower armature (6) is provided with a limiting groove (601), and the other end of the contact spring (4) is located in the limiting groove (601).

9. The push assembly of a DC contactor of claim 1, wherein: The bracket (5) has a channel running through its left and right sides. The movable contact piece (1) is inserted transversely into the channel, and both ends of the movable contact piece (1) extend outward from the bracket (5).

10. The push assembly of a DC contactor of claim 1, wherein: The through hole (5011) is circular, rectangular, or polygonal.

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