Direct current relay provided with auxiliary contact points

Abstract

Disclosed in the present utility model is a direct current relay provided with auxiliary contact points, comprising: stationary contacts, a movable contact piece, auxiliary stationary contact points, an auxiliary movable contact piece, and a push rod assembly; the push rod assembly is used for driving the movable contact piece to be connected to or disconnected from the stationary contacts, and also driving the auxiliary movable contact piece to be connected to or disconnected from the auxiliary stationary contact points; the push rod assembly comprises an insulating base; the auxiliary movable contact piece is fixedly provided at the bottom of the insulating base; the auxiliary movable contact piece is provided with lever extension portions located at the bottom of the insulating base, and auxiliary contact terminals extending outward from the insulating base and arranged opposite to the auxiliary stationary contact points; and the lever extension portions and the auxiliary contact terminals are integrally connected to form auxiliary movable contact arms. In the present utility model, when the internal space of the relay is fixed, the lever length of the auxiliary movable contact piece can be prolonged as much as possible, thereby effectively solving the risk that, in practical use, the auxiliary contact points may not be electrically connected upon closure due to yielding or even break of material caused by a short lever of the auxiliary movable contact piece, ensuring normal operation of the relay.

Description

DC relay with auxiliary contact TECHNICAL FIELD

[0001] The utility model relates to relay technology field especially relates to a DC relay with auxiliary contact. BACKGROUND

[0002] With the rapid development of new energy industry, the market demand for function integration and diversification of high-voltage DC relays is becoming higher and higher. While the main circuit is in the normal open state and the conduction state, the auxiliary circuit needs to monitor the state of the main circuit or needs an additional auxiliary circuit switch to perform separate opening and closing operations, so as to realize the opening and conduction of the auxiliary circuit. Under this condition, the DC relay with auxiliary contact emerges as the times require, which uses the auxiliary contact as an auxiliary logic switch of the circuit control system to determine the working state of the relay, and can also monitor the sticking failure of the main circuit contact.

[0003] For example, a high-voltage DC relay with auxiliary contact disclosed in Chinese patent application No. CN117577486A, published on February 20, 2024, has a connecting piece on the push assembly, which moves to contact the first auxiliary contact lead-out end and the second auxiliary contact lead-out end, realizing the electrical conduction of the first auxiliary contact lead-out end and the second auxiliary contact lead-out end. The connecting piece is a copper sheet, and the push assembly is at least partially made of plastic. The copper sheet is integrally embedded in the plastic by injection molding. Although this auxiliary contact structure can monitor the working state of the main contact, the design of this structure still has some defects. Part of the connecting piece is injection molded in the push assembly, and the other part protrudes upward from the push assembly to contact the auxiliary contact lead-out end. This structure causes the connecting piece to have a short force arm. During the operation of the relay, the connecting piece needs to bear a large torque, which can easily cause the material to yield or even break. If this happens, even if the auxiliary contact is closed, it cannot be effectively turned on, which affects the normal operation of the relay. Therefore, under the condition of limited space in the DC relay, how to provide an auxiliary contact structure with a longer force arm has become a technical problem that needs to be solved by those skilled in the art. TECHNICAL PROBLEM

[0004] The problem to be solved by the utility model is to provide a DC relay with auxiliary contact to overcome the defects of short force arm of the auxiliary contact of the existing DC relay, which can easily cause the material to yield or even break. TECHNICAL SOLUTION

[0005] The utility model discloses a direct current relay with auxiliary contact, which comprises a static contact, a movable contact, an auxiliary static contact, an auxiliary movable contact and a push rod group, wherein the push rod group is used to drive the movable contact to connect or disconnect the static contact, and simultaneously drive the auxiliary movable contact to connect or disconnect the auxiliary static contact; the push rod group comprises an insulating base, the auxiliary movable contact is fixedly arranged at the bottom of the insulating base, the auxiliary movable contact is provided with an arm extension part at the bottom of the insulating base and an auxiliary contact leg extending outward from the insulating base and oppositely distributed with the auxiliary static contact, and the arm extension part and the auxiliary contact leg are integrally connected to form an auxiliary movable contact arm.

[0006] As a further improvement of the utility model, one end of the arm extension part away from the auxiliary contact leg is fixedly connected with the insulating base, thereby forming a fixed point, the auxiliary contact leg is provided with a contact point for abutting against the auxiliary static contact, and the length of the arm of the auxiliary movable contact arm is the vertical distance from the contact point to the fixed point.

[0007] As a further improvement of the utility model, the auxiliary movable contact is made of an elastic conductive metal material, when the movable contact is connected with the static contact, the auxiliary static contact abuts against the auxiliary contact leg, and the auxiliary movable contact arm is elastically deformed.

[0008] As a further improvement of the utility model, the auxiliary contact leg is provided with two, and the two auxiliary contact legs symmetrically extend outward from opposite sides of the insulating base.

[0009] As a further improvement of the utility model, the bottom of the insulating base is provided with a supporting boss, the middle part of the auxiliary movable contact is provided with a hole for sleeving on the supporting boss, and two "human" shaped and symmetrically distributed arm extension parts are formed, the two arm extension parts are one-to-one connected with the two auxiliary contact legs, and each arm extension part is provided with a fixed point on two ends away from the auxiliary contact leg.

[0010] As a further improvement of the utility model, the auxiliary contact leg is provided with two, and the two auxiliary contact legs extend outward side by side from the same side of the insulating base.

[0011] As a further improvement of the utility model, the insulating base is integrally injection molded by a plastic material, and the insulating base and the arm extension part are fixedly connected at the position of the fixed point by any one of riveting, bonding, screw locking and injection molding.

[0012] As a further improvement of the utility model, the insulating base is integrally injection molded by plastic material, and a hot melting column is integrally formed at the bottom of the insulating base, one end of the force arm extension is provided with a socket, the hot melting column is inserted into the socket and fixed by hot melting riveting process, so as to form the fixed point.

[0013] As a further improvement of the utility model, one end of the auxiliary contact is provided with horizontally distributed tongue, the other end of the auxiliary contact is downwardly bent relative to the tongue and connected to the force arm extension, so that the height of the tongue is higher than the force arm extension. Advantageous effects

[0014] The utility model discloses a direct current relay with auxiliary contact, the auxiliary moving contact piece is fixed at the bottom of the insulating base, and the auxiliary moving contact piece is provided with the force arm extension at the bottom of the insulating base and the auxiliary contact foot that stretches out the insulating base and is opposite to the auxiliary static contact, the force arm extension and the auxiliary contact foot are integrally connected to form the auxiliary moving contact arm, under the condition that the relay internal space is certain, the bottom space of the insulating base can be reasonably utilized by this structure, the force arm length of the auxiliary moving contact piece is as long as possible, the risk that the auxiliary contact is not conducted after closing due to the short force arm of the auxiliary moving contact piece in the actual use is effectively solved, and the normal work of the relay is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a perspective view of the direct current relay with auxiliary contact of the utility model embodiment one;

[0016] Fig. 2 is a sectional view of the direct current relay with auxiliary contact of the utility model embodiment one;

[0017] Fig. 3 is the right view of the moving contact piece, auxiliary static contact, auxiliary moving contact piece and push rod group in the utility model embodiment one;

[0018] Fig. 4 is the perspective view of the moving contact piece, auxiliary moving contact piece and push rod group in the utility model embodiment one;

[0019] Fig. 5 is the exploded view of the auxiliary moving contact piece and insulating base in the utility model embodiment one;

[0020] Fig. 6 is the perspective view of the auxiliary moving contact piece in the utility model embodiment one;

[0021] Fig. 7 is a perspective view of the direct current relay with auxiliary contact of the utility model embodiment two;

[0022] Fig. 8 is the bottom view of the auxiliary moving contact piece and insulating base in the utility model embodiment two. Best mode of the present application

[0023] The preferred embodiments of the utility model are explained in detail below with reference to the drawings. Embodiment One

[0024] Referring to Figs. 1 and 2, the utility model provides a DC relay with auxiliary contact, comprising: auxiliary static contact 3, auxiliary moving contact 4 and static contact 1, moving contact 2, push rod group, ceramic cover 7, magnetic pole piece 8 and electromagnetic drive mechanism 9 which are all conventional technology.

[0025] Among them, ceramic cover 7 is fixed on the top of magnetic pole piece 8 through a connecting ring, static contact 1 generally has a pair of two, two static contacts 1 are fixed side by side on the top of ceramic cover 7, and the lower end of two static contacts 1 is all extended to the inside of ceramic cover 7, and the upper end is all protruded upwards out of ceramic cover 7, for connecting into load loop. Push rod group is contained in ceramic cover 7, moving contact 2 is installed on push rod group, and the both ends of moving contact 2 are just below two static contacts 1. Electromagnetic drive mechanism 9 is arranged at the bottom of magnetic pole piece 8 and is connected with push rod group, electromagnetic drive mechanism 9 is used for driving push rod group to move up and down along the axial direction, and then moving contact 2 is driven by push rod group to connect or disconnect two static contacts 1.

[0026] In the embodiment, auxiliary static contact 3 is also fixed on ceramic cover 7, auxiliary moving contact 4 is fixed on push rod group, and push rod group drives moving contact 2 to connect or disconnect two static contacts 1, and also can drive auxiliary moving contact 4 to connect or disconnect auxiliary static contact 3, to monitor the working state of relay.

[0027] Referring to Figs. 3 to 5, push rod group comprises insulating base 5, auxiliary moving contact 4 is fixedly arranged at the bottom of insulating base 5, auxiliary moving contact 4 is provided with force arm extension part 41 at the bottom of insulating base 5 and auxiliary contact leg 42 which is extended out of insulating base 5 and is distributed opposite to auxiliary static contact 3, force arm extension part 41 is integrally connected with auxiliary contact leg 42 and forms auxiliary moving contact arm 43 together. In this way, the force arm of auxiliary moving contact 4 not only includes the part outside insulating base 5, but also includes force arm extension part 41 at the bottom of insulating base 5, under the condition that the internal space of relay is certain, the bottom space of insulating base 5 can be reasonably utilized through the structure, the length of force arm of auxiliary moving contact 4 is as long as possible, and the risk that auxiliary moving contact 4 is broken due to short force arm in actual use process is effectively solved, so that the relay can work normally.

[0028] The auxiliary moving contact 4 is made of an elastic conductive metal material, when the electromagnetic driving mechanism 9 drives the push rod set to move upwards to push the moving contact 2 to be connected with the static contact 1, at this time, the push rod set also drives the auxiliary moving contact 4 to move upwards, so that the auxiliary static contact 3 abuts against the auxiliary contact foot 42. Because the moving stroke of the push rod set driving the auxiliary moving contact 4 is greater than the distance between the auxiliary moving contact 4 and the auxiliary static contact 3 in the disconnected state, under the abutment of the auxiliary static contact 3, the auxiliary moving contact arm 43 is elastically deformed to a certain extent, so that the reliability of the contact between the auxiliary static contact 3 and the auxiliary moving contact 4 is ensured. At the same time, because the force arm of the auxiliary moving contact arm 43 is long, it can bear a large torque, and is not easy to cause material yield or fracture risk.

[0029] As shown in FIG. 4, the force arm extension 41 is fixedly connected with the insulating base 5 at one end away from the auxiliary contact foot 42, so as to form a fixed point; the auxiliary contact foot 42 has a contact point for abutting against the auxiliary static contact 3, and the length of the force arm of the auxiliary moving contact arm 43 is the vertical distance from the contact point to the fixed point. It can be understood that the aforementioned “vertical distance” does not refer to the straight line distance between the contact point and the fixed point, but the distance along the X axis with reference to FIG. 3.

[0030] In the embodiment, the auxiliary static contact 3 is provided with two auxiliary static contacts 3, which are distributed on both sides of the push rod set and are fixed in the vertical direction on the top wall of the ceramic cover 7. Correspondingly, the auxiliary contact foot 42 is also provided with two auxiliary contact feet 42, which symmetrically extend outward from the opposite sides of the insulating base 5.

[0031] Of course, in other embodiments of the utility model, the two auxiliary static contacts 3 can also be fixed in the horizontal direction on the opposite side walls of the ceramic cover 7, and the connection or disconnection with the two auxiliary contact feet 42 can also be achieved.

[0032] Referring to FIGS. 2 and 5, the bottom of the insulating base 5 is provided with a supporting boss 51, which is used for supporting on the magnetic pole piece 8 when the relay is in the power-off state.

[0033] Referring to FIGS. 4 to 6, the middle part of the auxiliary moving contact 4 is a ring-shaped hole for sleeving on the supporting boss 51, and the ring-shaped middle part of the auxiliary moving contact 4 can be regarded as being integrally connected by two force arm extensions 41 which are in a “herringbone” shape and symmetrically distributed, the two auxiliary contact feet 42 are connected to the two force arm extensions 41 one by one, and each force arm extension 41 has a fixed point on each end away from the auxiliary contact foot 42, and the length of the force arm of the auxiliary moving contact arm 43 is the vertical distance between the connecting line between the contact point and the two fixed points.

[0034] In the utility model, the insulating base 5 is integrally injection molded by plastic material, and four hot melt columns 52 are integrally formed on the bottom of the insulating base 5 corresponding to the fixed point positions, the two ends of the force arm extension 41 away from the auxiliary contact leg 42 are provided with the insertion holes 411 corresponding to the fixed point positions, the hot melt columns 52 are inserted into the insertion holes 411 one by one and are fixed through the hot melt riveting process, so that the fixed points are formed.

[0035] Of course, in other embodiments of the utility model, the insulating base 5 and the force arm extension 41 can also be directly fixed and connected through any one of riveting, bonding, screw locking and injection molding at the fixed point positions.

[0036] Referring to Figs. 3 and 6, one end of the auxiliary contact leg 42 is provided with horizontally distributed tongue pieces 421, the other end of the auxiliary contact leg 42 is bent downward relative to the tongue pieces 421 and is connected to the force arm extension 41, so that the height of the tongue pieces 421 is higher than that of the force arm extension 41.

[0037] In the embodiment, the push rod group further comprises a contact support 10, a push rod 11 and a contact spring 12, the contact support 10 is frame-shaped, the bottom of the contact support 10 and the upper end of the push rod 11 are integrally injection molded in the insulating base 5 and are insulated from each other, and the lower end of the push rod 11 extends vertically downward after passing through the magnetic pole piece 8. The moving contact piece 2 is transversely arranged in the contact support 10, the contact spring 12 is arranged between the insulating base 5 and the moving contact piece 2, the contact spring 12 applies an upward elastic force to the moving contact piece 2, so that the moving contact piece 2 is attached to the top wall of the contact support 10.

[0038] In the embodiment, the electromagnetic driving mechanism 9 comprises a moving iron core, a static iron core, a U-shaped yoke and a coil winding, wherein the U-shaped yoke and the coil winding are not shown in the drawings. The static iron core is fixed to the bottom of the magnetic pole piece 8, the moving iron core is arranged below the static iron core in a spaced-apart manner and is fixedly connected to the lower end of the push rod 11. The bottom of the magnetic pole piece 8 is further fixed with a sleeve, the static iron core and the moving iron core are accommodated in the sleeve, and a counter-force spring is arranged between the static iron core and the moving iron core, and the coil winding is sleeved on the outside of the sleeve.

[0039] When the coil winding is energized, the magnetized moving iron core is attracted by the static iron core and moves upward, and is finally attracted to the bottom of the static iron core. In this process, the moving iron core pushes the moving contact piece 2 upward through the push rod group, so that the moving contact piece 2 is in contact with the two static contacts 1 and is conductive; at the same time, the push rod group drives the auxiliary moving contact piece 4 to move upward, so that the auxiliary moving contact piece 4 is in contact with the two auxiliary static contact points 3. When the coil winding is de-energized, the magnetic attraction between the moving iron core and the static iron core disappears, and the moving iron core moves downward under the joint action of the contact spring 12 and the counter-force spring and resets, and carries the moving contact piece 2 and the two static contacts 1 to be disconnected, and also carries the auxiliary moving contact piece 4 and the two auxiliary static contact points 3 to be disconnected. Embodiment two

[0040] Referring to FIG. 7 and FIG. 8, the difference between the embodiment and the embodiment one is that two auxiliary static contacts 3 are distributed on one side of the push rod group, and are fixed on the top wall of the ceramic cover 7 in the vertical direction. Correspondingly, two auxiliary contact legs 42 extend outward from the same side of the insulating base 5 side by side, and are correspondingly arranged directly below the two auxiliary static contacts 3.

[0041] As shown in FIG. 8, the auxiliary moving contact 4 is provided with a force arm extension 41, and the two auxiliary contact legs 42 are integrally connected to the force arm extension 41.

[0042] The embodiment adopts the structure design, which can also make the force arm of the auxiliary moving contact 4 not only limited to the part outside the insulating base 5, but also include the force arm extension 41 at the bottom of the insulating base 5. Under the condition of a certain internal space of the relay, the bottom space of the insulating base 5 can be reasonably utilized through the structure, and the length of the force arm of the auxiliary moving contact 4 is as long as possible, so that the risk of not conducting after the auxiliary contact is closed due to the short force arm of the auxiliary moving contact 4, which leads to material yield or even fracture, is effectively solved, and the normal work of the relay is ensured.

[0043] In the above description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the above description is only a preferred embodiment of the present application, and the present application can be implemented in many other ways different from the description. Therefore, the present application 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 technical solution of the present application, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of the present application. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical solution of the present application, still belongs to the protection scope of the technical solution of the present application. Embodiment of the application

[0044] Enter the embodiment description paragraph of the application here. Industrial applicability

[0045] Enter the industrial applicability description paragraph here. Free content of sequence listing

[0046] Enter the free content description paragraph of the sequence listing here.

Claims

1. A DC relay with auxiliary contacts, comprising a stationary contact (1), a movable contact (2), an auxiliary stationary contact (3), an auxiliary movable contact (4) and a push rod group for actuating the movable contact (2) to make or break the stationary contact (1) and simultaneously actuating the auxiliary movable contact (4) to make or break the auxiliary stationary contact (3), characterized in that: The push rod assembly includes an insulating base (5), and the auxiliary movable contact piece (4) is fixedly disposed at the bottom of the insulating base (5). The auxiliary movable contact piece (4) is provided with a lever arm extension (41) at the bottom of the insulating base (5) and an auxiliary contact foot (42) extending outward from the insulating base (5) and distributed opposite to the auxiliary stationary contact point (3). The lever arm extension (41) and the auxiliary contact foot (42) are integrally connected to form an auxiliary movable contact arm (43).

2. The DC relay with auxiliary contact according to claim 1, characterized in that: The end of the lever arm extension (41) away from the auxiliary contact foot (42) is fixedly connected to the insulating base (5) to form a fixed point. The auxiliary contact foot (42) has a contact point for abutting against the auxiliary stationary contact point (3). The lever arm length of the auxiliary moving contact arm (43) is the vertical distance from the contact point to the fixed point.

3. The DC relay with auxiliary contact according to claim 1, characterized in that: The auxiliary moving contact (4) is made of an elastic conductive metal material. When the moving contact (2) is connected to the stationary contact (1), the auxiliary stationary contact (3) abuts against the auxiliary contact foot (42), causing the auxiliary moving contact arm (43) to undergo a certain elastic deformation.

4. The DC relay with auxiliary contact according to claim 2, characterized in that: Two auxiliary contacts (42) are provided, and the two auxiliary contacts (42) extend outward symmetrically from opposite sides of the insulating base (5).

5. The DC relay with auxiliary contact according to claim 4, characterized in that: The bottom of the insulating base (5) is provided with a support boss (51). The auxiliary moving contact piece (4) has an opening in the middle to fit onto the support boss (51) and form two lever arm extensions (41) that are symmetrically distributed in a "V" shape. The two lever arm extensions (41) are connected to the two auxiliary contact feet (42) one by one, and each lever arm extension (41) has a fixing point on both ends away from the auxiliary contact feet (42).

6. The DC relay with auxiliary contact according to claim 1, characterized in that: Two auxiliary contacts (42) are provided, and the two auxiliary contacts (42) extend outward side by side from the same side of the insulating base (5).

7. The DC relay with auxiliary contact according to claim 2, characterized in that: The insulating base (5) is integrally injection molded from plastic material, and the insulating base (5) and the lever arm extension (41) are directly fixedly connected at the fixed point by any one of riveting, bonding, screw fastening and injection molding.

8. The DC relay with auxiliary contact according to claim 2, characterized in that: The insulating base (5) is integrally injection molded from plastic material, and the bottom of the insulating base (5) is also integrally formed with a hot melt column (52). One end of the lever arm extension (41) is provided with a socket (411). The hot melt column (52) is inserted into the socket (411) and fixed by hot melt riveting process to form the fixing point.

9. The DC relay with auxiliary contact according to claim 1, characterized in that: One end of the auxiliary contact (42) is provided with a horizontally distributed tongue (421), and the other end of the auxiliary contact (42) is bent downward relative to the tongue (421) and connected to the lever arm extension (41), so that the height of the tongue (421) is higher than that of the lever arm extension (41).

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