Direct current relay with auxiliary contact

Abstract

The utility model discloses a direct current relay with an auxiliary contact, which comprises a static contact, a moving contact piece, an auxiliary static contact, an auxiliary moving contact piece and a push rod group, the push rod group is used for driving the moving contact piece to be connected or disconnected with the static contact and simultaneously driving the auxiliary moving contact piece to be connected or disconnected with the auxiliary static contact, and the push rod group comprises an insulating base. The auxiliary movable contact piece is fixedly arranged at the bottom of the insulating base, the auxiliary movable contact piece is provided with a force arm extension part located at the bottom of the insulating base and an auxiliary contact pin which extends out of the insulating base and is distributed opposite to the auxiliary static contact, and the force arm extension part and the auxiliary contact pin are integrally connected to form an auxiliary movable contact arm. According to the utility model, under the condition that the internal space of the relay is fixed, the length of the force arm of the auxiliary movable contact piece can be prolonged as much as possible, thereby effectively solving the risk that the auxiliary movable contact piece is not conducted after being closed due to material yield and even fracture caused by short force arm of the auxiliary movable contact piece in the actual use process, and ensuring the normal work of the relay.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a DC relay with auxiliary contacts. Background Art

[0002] With the rapid development of the new energy industry, the market demand for the functional integration and diversification of high-voltage DC relays is getting higher and higher. When the main circuit is in the normal disconnected state and the conductive state, the auxiliary circuit is also required to monitor the state of the main circuit or the additional auxiliary circuit switch is required to perform separate disconnection and closing operations to achieve the disconnection and conduction of the auxiliary circuit. In this case, DC relays with auxiliary contacts came into being. The auxiliary contacts are used as auxiliary logic switches of the circuit control system to judge the working state of the relay, and can also monitor the adhesion failure of the main circuit contacts.

[0003] For example, a Chinese invention patent application with application publication number CN117577486A and application publication date 2024.02.20 discloses a high-voltage DC relay with auxiliary contacts, wherein a connector is provided on the push assembly, and the connector follows the push assembly to move against the first auxiliary contact lead-out terminal and the second auxiliary contact lead-out terminal, so as to realize electrical conduction between the first auxiliary contact lead-out terminal and the second auxiliary contact lead-out terminal, wherein the connector is a copper sheet, and the push assembly is at least partially plastic, and the copper sheet and the plastic are integrally inserted and injection molded. Although the existing auxiliary contact structure can monitor the working state of the main contact, the design of this structure still has certain defects. A part of the connector is injection molded in the push assembly, and the other part extends upward from the push assembly to achieve contact with the auxiliary contact lead-out terminal. This structure will cause the force arm of the connector to be shorter. During the operation of the relay, the connector needs to bear a large torque, which easily causes the material to yield or even break. Once this happens, even if the auxiliary contact is closed, effective conduction cannot be achieved, thereby affecting the normal operation of the relay. Therefore, when the internal space of the DC relay is limited, how to provide a method for increasing the lever arm of the auxiliary contact structure becomes a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a DC relay with auxiliary contacts to overcome the defects of the existing DC relays that the auxiliary contacts have short force arms and are prone to material yield or even fracture.

[0005] The technical solution adopted by the present utility model to solve its technical problems is: a DC relay with auxiliary contacts, including: a static contact, a moving contact piece, an auxiliary static contact, an auxiliary moving contact piece and a push rod group. The push rod group is used to drive the moving contact piece to connect or disconnect from the static contact, and at the same time drive the auxiliary moving contact piece to connect or disconnect from the auxiliary static contact. The push rod group includes an insulating base. The auxiliary moving contact piece is fixedly arranged at the bottom of the insulating base. The auxiliary moving contact piece is provided with a force arm extension part at the bottom of the insulating base and an auxiliary contact foot that extends out of the insulating base and is distributed opposite to the auxiliary static contact. The force arm extension part and the auxiliary contact foot are integrally connected to form an auxiliary moving contact arm.

[0006] As a further improvement of the present utility model, one end of the force arm extension part away from the auxiliary contact foot is fixedly connected to the insulating base, thereby forming a fixed point. The auxiliary contact foot has a contact point for abutting against the auxiliary static contact. The force arm length of the auxiliary moving contact arm is the vertical distance from the contact point to the fixed point.

[0007] As a further improvement of the present utility model, the auxiliary moving contact piece is made of an elastic conductive metal material. When the moving contact piece is connected to the static contact, the auxiliary static contact abuts against the auxiliary contact foot, causing a certain elastic deformation of the auxiliary moving contact arm.

[0008] As a further improvement of the present utility model, two auxiliary contact feet are provided, and the two auxiliary contact feet symmetrically extend outwards from opposite sides of the insulating base.

[0009] As a further improvement of the present utility model, a support boss is provided at the bottom of the insulating base. The middle of the auxiliary moving contact piece is provided with a hole to be sleeved on the support boss, and two force arm extension parts in a "person" shape and symmetrically distributed are formed. The two force arm extension parts are respectively connected to the two auxiliary contact feet, and each of the two ends of each force arm extension part away from the auxiliary contact foot has a fixed point.

[0010] As a further improvement of the present utility model, two auxiliary contact feet are provided, and the two auxiliary contact feet extend outwards side by side from the same side of the insulating base.

[0011] As a further improvement of the present utility model, the insulating base is integrally injection-molded from a plastic material, and the insulating base and the force arm extension part are fixedly connected directly 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 present utility model, the insulating base is integrally injection-molded from a plastic material, and a hot melt post is integrally formed at the bottom of the insulating base. One end of the force arm extension is provided with a jack, and the hot melt post is inserted into the jack and fixed by a hot melt riveting process to form the fixed point.

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

[0014] The beneficial effects of the present utility model are as follows: The present utility model provides a DC relay with auxiliary contacts. By fixedly arranging the auxiliary moving contact piece at the bottom of the insulating base, and the auxiliary moving contact piece is provided with a force arm extension at the bottom of the insulating base and an auxiliary contact leg that extends out of the insulating base and is distributed opposite to the auxiliary static contact. The force arm extension and the auxiliary contact leg are integrally connected to form an auxiliary moving contact arm. When the internal space of the relay is certain, this structure can reasonably utilize the bottom space of the insulating base, and extend the force arm length of the auxiliary moving contact piece as much as possible, effectively solving the risk that the auxiliary moving contact piece has a short force arm during actual use, resulting in material yield or even fracture, and thus causing non-conduction after the auxiliary contact is closed, ensuring the normal operation of the relay. Description of the Drawings

[0015] Figure 1 Is a perspective view of the first embodiment of the DC relay with auxiliary contacts of the present utility model;

[0016] Figure 2 Is a cross-sectional view of the first embodiment of the DC relay with auxiliary contacts of the present utility model;

[0017] Figure 3 Is a right view of the moving contact piece, auxiliary static contact, auxiliary moving contact piece and push rod group in the first embodiment of the present utility model;

[0018] Figure 4 Is a perspective view of the moving contact piece, auxiliary moving contact piece and push rod group in the first embodiment of the present utility model;

[0019] Figure 5 Is an exploded view of the auxiliary moving contact piece and the insulating base in the first embodiment of the present utility model;

[0020] Figure 6 Is a perspective view of the auxiliary moving contact piece in the first embodiment of the present utility model;

[0021] Figure 7 Is a perspective view of the second embodiment of the DC relay with auxiliary contacts of the present utility model;

[0022] Figure 8 This is the bottom view of the auxiliary moving contact piece and the insulating base in the second embodiment of the present utility model.

[0023] The following explanations are made in conjunction with the accompanying drawings:

[0024] 1. Stationary contact; 2. Moving contact piece; 3. Auxiliary stationary contact point; 4. Auxiliary moving contact piece;

[0025] 41. Lever arm extension part; 411. Jack; 42. Auxiliary contact leg; 421. Tongue piece; 43. Auxiliary moving contact arm; 5. Insulating base; 51. Support boss; 52. Hot melt column; 7. Ceramic cover; 8. Magnetic pole piece; 9. Electromagnetic drive mechanism; 10. Contact support; 11. Push rod; 12. Contact spring. Specific embodiments

[0026] The following is a detailed description of the preferred embodiments of the present utility model in conjunction with the accompanying drawings.

[0027] Embodiment 1

[0028] Refer to Figure 1 and Figure 2 The present utility model provides a DC relay with auxiliary contact points, including: an auxiliary stationary contact point 3, an auxiliary moving contact piece 4, and a stationary contact 1, a moving contact piece 2, a push rod group, a ceramic cover 7, a magnetic pole piece 8, and an electromagnetic drive mechanism 9, all of which are conventional technologies in the art.

[0029] Among them, the ceramic cover 7 is fixed on the top of the magnetic pole piece 8 through a connecting ring. Generally, there are a pair of stationary contacts 1, that is, two. The two stationary contacts 1 are fixed side by side on the top of the ceramic cover 7. The lower ends of the two stationary contacts 1 extend into the interior of the ceramic cover 7, and their upper ends protrude upward from the ceramic cover 7 for connecting to the load circuit. The push rod group is received in the ceramic cover 7. The moving contact piece 2 is installed on the push rod group, and both ends of the moving contact piece 2 are located directly below the two stationary contacts 1. The electromagnetic drive mechanism 9 is arranged at the bottom of the magnetic pole piece 8 and is connected to the push rod group. The electromagnetic drive mechanism 9 is used to drive the push rod group to move up and down axially, and then drive the moving contact piece 2 to connect or disconnect from the two stationary contacts 1 through the push rod group.

[0030] In this embodiment, the auxiliary stationary contact point 3 is also fixed on the ceramic cover 7, and the auxiliary moving contact piece 4 is fixed on the push rod group. When the push rod group drives the moving contact piece 2 to connect or disconnect from the two stationary contacts 1, it can also drive the auxiliary moving contact piece 4 to connect or disconnect from the auxiliary stationary contact point 3 to monitor the working state of the relay.

[0031] Refer to Figures 3 to 5, the push rod group includes an insulating base 5, an auxiliary moving contact 4 is fixedly arranged at the bottom of the insulating base 5. The auxiliary moving contact 4 is provided with a force arm extension part 41 at the bottom of the insulating base 5 and an auxiliary contact foot 42 that extends out of the insulating base 5 and is vertically opposite to the auxiliary static contact 3. The force arm extension part 41 and the auxiliary contact foot 42 are integrally connected to jointly form an auxiliary moving contact arm 43. In this way, the force arm of the auxiliary moving contact 4 is not only limited to the part outside the insulating base 5, but also includes the part at the bottom of the insulating base 5, that is, the force arm extension part 41. When the internal space of the relay is certain, through this structure, the bottom space of the insulating base 5 can be reasonably utilized, and the force arm length of the auxiliary moving contact 4 can be extended as much as possible, effectively solving the risk that the auxiliary moving contact 4 may cause the material to yield or even break due to the short force arm during actual use, resulting in non-conduction after the auxiliary contact is closed, and ensuring the normal operation of the relay.

[0032] Among them, the auxiliary moving contact 4 is made of an elastic conductive metal material as a whole. When the electromagnetic driving mechanism 9 drives the push rod group to move upward to push the moving contact 2 into contact with the static contact 1, at this time, the push rod group will also drive the auxiliary moving contact 4 to move upward, so that the auxiliary static contact 3 abuts against the auxiliary contact foot 42. Since the moving stroke of the push rod group 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 off state, therefore, under the abutment of the auxiliary static contact 3, the auxiliary moving contact arm 43 will undergo a certain elastic deformation to ensure the reliability of the contact between the auxiliary static contact 3 and the auxiliary moving contact 4. At the same time, since the force arm of the auxiliary moving contact arm 43 is relatively long, it can withstand a large torque and is not prone to the risk of material yield or fracture.

[0033] As Figure 4 shown, one end of the force arm extension part 41 far from the auxiliary contact foot 42 is fixedly connected to the insulating base 5, thus forming a fixed point; the auxiliary contact foot 42 has a contact point for abutting against the auxiliary static contact 3, and the force arm length 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 is the distance along the X axis with Figure 3 as a reference.

[0034] In this embodiment, two auxiliary static contacts 3 are provided, and the two auxiliary static contacts 3 are distributed on both sides of the push rod group and are both fixedly arranged on the top wall of the ceramic cover 7 in the vertical direction. Correspondingly, two auxiliary contact feet 42 are also provided, and the two auxiliary contact feet 42 symmetrically extend out from the opposite sides of the insulating base 5.

[0035] Of course, in other embodiments of the present invention, the two auxiliary static contacts 3 can also be fixedly arranged on the opposite side walls of the ceramic cover 7 in the horizontal direction, and the connection or disconnection with the two auxiliary contact feet 42 can also be realized.

[0036] Refer to Figure 2 and Figure 5 At the bottom of the insulating base 5, there is a supporting boss 51, and the supporting boss 51 is used to support on the magnetic pole piece 8 when the relay is powered off.

[0037] Refer to Figures 4 to 6 In the middle of the auxiliary moving contact piece 4, an opening is formed in a ring shape to be sleeved on the supporting boss 51. The middle part of the auxiliary moving contact piece 4 in a ring shape can be regarded as being integrally connected by two force arm extension parts 41 which are in a "herringbone" shape and symmetrically distributed. Two auxiliary contact feet 42 are respectively connected to the two force arm extension parts 41, and fixed points are provided on both ends of each force arm extension part 41 away from the auxiliary contact foot 42. The force arm length of the auxiliary moving contact arm 43 is the vertical distance from the contact point to the connection line between the two fixed points.

[0038] In the present utility model, the insulating base 5 is integrally injection molded from a plastic material, and four hot melt posts 52 are also integrally formed at the bottom of the insulating base 5 corresponding to the positions of the fixed points. Jacks 411 are provided at the positions corresponding to the fixed points on both ends of the force arm extension part 41 away from the auxiliary contact foot 42. The hot melt posts 52 are respectively inserted into the jacks 411 and fixed by a hot melt riveting process, thereby forming the fixed points.

[0039] Of course, in other embodiments of the present utility model, the insulating base 5 and the force arm extension part 41 can also be fixedly connected directly through any one of riveting, bonding, screw locking and injection molding at the position of the fixed point.

[0040] Refer to Figure 3 and Figure 6 At one end of the auxiliary contact foot 42, a horizontally distributed tongue piece 421 is provided. The other end of the auxiliary contact foot 42 is bent downward relative to the tongue piece 421 and connected to the force arm extension part 41, so that the height of the tongue piece 421 is higher than that of the force arm extension part 41.

[0041] In this embodiment, the push rod group further includes a contact support 10, a push rod 11 and a contact spring 12. The contact support 10 is in a frame shape. 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. The lower end of the push rod 11 passes through the magnetic pole piece 8 and extends vertically downward. The moving contact piece 2 passes through the contact support 10 horizontally. 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 abuts against the top wall of the contact support 10.

[0042] In this embodiment, the electromagnetic driving mechanism 9 includes a moving iron core, a static iron core, a U-shaped yoke iron, a coil winding, etc., where the U-shaped yoke iron and the coil winding are not shown in the figure. The static iron core is fixed to the bottom of the pole piece 8, and the moving iron core is arranged at a relative interval below the static iron core and fixedly connected to the lower end of the push rod 11. A sleeve is also fixed to the bottom of the pole piece 8. Both the static iron core and the moving iron core are received in the sleeve, and a reaction spring is installed between them. The coil winding is sleeved on the outside of the sleeve.

[0043] When the coil winding is energized, the magnetized moving iron core is attracted by the static iron core and moves upward, and finally attracts and adheres to the bottom of the static iron core. During 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 comes into contact and conducts with the two static contact pieces 1; at the same time, the push rod group drives the auxiliary moving contact piece 4 upward, so that the auxiliary moving contact piece 4 is connected to the two auxiliary static contact points 3. When the coil winding is de-energized, the magnetic attraction force between the moving iron core and the static iron core disappears. Under the combined action of the contact spring 12 and the reaction spring, the moving iron core moves downward to reset, and drives the moving contact piece 2 to break off from the two static contact pieces 1, and also drives the auxiliary moving contact piece 4 to break off from the two auxiliary static contact points 3.

[0044] Embodiment Two

[0045] Refer to Figure 7 and Figure 8 In this embodiment, the difference from Embodiment One is that the two auxiliary static contact points 3 are distributed on one side of the push rod group and are both fixedly mounted on the top wall of the ceramic cover 7 in the vertical direction. Correspondingly, the two auxiliary contact feet 42 extend outward side by side from the same side of the insulating base 5 and are respectively located directly below the two auxiliary static contact points 3.

[0046] As Figure 8 shown, the auxiliary moving contact piece 4 is provided with a force arm extension part 41, and the two auxiliary contact feet 42 are integrally connected to the force arm extension part 41.

[0047] With this structural design in this embodiment, it is also possible to make the force arm of the auxiliary moving contact piece 4 not only limited to the part outside the insulating base 5, but also include the part at the bottom of the insulating base 5, that is, the force arm extension part 41. When the internal space of the relay is certain, this structure can reasonably utilize the bottom space of the insulating base 5, extend the force arm length of the auxiliary moving contact piece 4 as much as possible, and effectively solve the risk that the auxiliary moving contact piece 4 has a short force arm during actual use, resulting in material yield or even fracture, which causes the auxiliary contact not to conduct after closing, and ensures the normal operation of the relay.

[0048] In the above description, many specific details are set forth in order to fully understand the present utility model. However, the above description is only a preferred embodiment of the present utility model, and the present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present utility model, or modify it into an equivalent embodiment with equivalent changes. All those that do not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A DC relay with auxiliary contacts, comprising a static contact (1), a moving contact piece (2), an auxiliary static contact (3), an auxiliary moving contact piece (4) and a push rod group. The push rod group is used to drive the moving contact piece (2) to connect or disconnect from the static contact (1), and at the same time drive the auxiliary moving contact piece (4) to connect or disconnect from the auxiliary static contact (3), characterized in that: The push rod group includes an insulating base (5). The auxiliary moving contact piece (4) is fixedly arranged at the bottom of the insulating base (5). The auxiliary moving contact piece (4) is provided with a force arm extension part (41) at the bottom of the insulating base (5) and an auxiliary contact foot (42) that extends out of the insulating base (5) and is distributed opposite to the auxiliary static contact point (3). The force arm extension part (41) and the auxiliary contact foot (42) are integrally connected to form an auxiliary moving contact arm (43).

2. The DC relay with auxiliary contacts according to claim 1, characterized in that: One end of the force arm extension part (41) away from the auxiliary contact foot (42) is fixedly connected to the insulating base (5), thereby forming a fixed point. The auxiliary contact foot (42) has a contact point for abutting against the auxiliary static contact point (3). The force 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 contacts according to claim 1, characterized in that: The auxiliary moving contact piece (4) is made of an elastic conductive metal material. When the moving contact piece (2) is connected to the static contact head (1), the auxiliary static contact point (3) abuts against the auxiliary contact foot (42), causing a certain elastic deformation of the auxiliary moving contact arm (43).

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

5. The DC relay with auxiliary contacts according to claim 4, characterized in that: A support boss (51) is provided at the bottom of the insulating base (5). The middle of the auxiliary moving contact piece (4) is perforated to be sleeved on the support boss (51), and two force arm extension parts (41) in a "person" shape and symmetrically distributed are formed. The two force arm extension parts (41) are respectively connected to the two auxiliary contact feet (42), and each of the two ends of each force arm extension part (41) away from the auxiliary contact foot (42) has a fixed point.

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

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

8. The DC relay with auxiliary contacts according to claim 2, characterized in that: The insulating base (5) is integrally injection-molded from a plastic material, and a hot melt post (52) is also integrally formed at the bottom of the insulating base (5). One end of the force arm extension part (41) is provided with a jack (411). The hot melt post (52) is inserted into the jack (411) and fixed by a hot melt riveting process, thereby forming the fixed point.

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

Images