A movable contact bridge holding structure

Abstract

The application discloses a dynamic contact bridge holding structure, which comprises a holding frame, a fixing piece, a dynamic contact piece and an elastic piece, wherein the holding frame comprises a first contact part and two first deformation parts which are integrally connected to two opposite sides of the first contact part and enclose a mounting port, and the inner sides of the two first deformation parts form abutting surfaces respectively; the two ends of the fixing piece are connected with the two first deformation parts respectively and close one side of the mounting port away from the first contact part; the dynamic contact piece and the elastic piece are arranged in the mounting port, the elastic piece is connected with the dynamic contact piece to provide elastic force to abut the dynamic contact piece against the fixing piece, and the dynamic contact piece is limited by the fixing piece to prevent the dynamic contact piece from being taken out of the mounting port. In the application, since the two ends of the fixing piece are connected with the two first deformation parts respectively, the holding frame cannot shake, and thus the positioning of the dynamic contact bridge is not affected.

Description

Technical Field

[0001] This invention relates to the field of DC relay technology, and more specifically to a moving contact bridge holding structure. Background Technology

[0002] DC relays are widely used as control switches. Their principle is to use an electromagnetic device on the low-voltage side to control the current flow on the high-voltage side. This is achieved by the electromagnetic device on the low-voltage side driving the moving contact bridge and the stationary contact to connect and disconnect, thus controlling the current flow on the high-voltage side. The holding structure of the moving contact bridge is a key aspect of a DC relay. This structure requires precise limiting and fixing of the moving contact bridge, demanding high assembly accuracy. Ideally, the structure should be designed to be simplified to improve the reliability of assembly and manufacturing.

[0003] Currently known related structures generally require the moving contact bridge to be integrated with the drive rod of the electromagnetic device, so that the electromagnetic device can drive the moving contact bridge to achieve the function of closing and opening the switch. Chinese Patent 201510971669.X discloses a retaining structure for a moving contact bridge, which uses an inverted "U"-shaped basket tensioned to a fixed plate by the elastic force of a main spring. The fixed plate and the drive rod are connected by a plastic material to hold the moving contact bridge together. However, this structure requires the spring and moving contact bridge to be installed before the inverted "U"-shaped basket is installed. During this process, the self-limiting of the moving contact bridge is very limited, requiring external limiting by relevant assembly equipment. The fit between the inverted "U"-shaped basket and the fixed plate is achieved through holes in the inverted "U"-shaped basket. The two sides of the fixed plate need to extend into the holes in the inverted "U"-shaped basket, and this fit is a clearance fit. This clearance can cause the connection between the fixed plate and the inverted "U"-shaped basket to be loose, resulting in slight shaking, which affects the limiting of the moving contact bridge and reduces the stability of the mechanism.

[0004] Therefore, there is an urgent need for a moving contact bridge retaining mechanism that will not affect the moving contact bridge limit. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a moving contact bridge retaining structure to solve the problem that the connection structure of the fixed plate and the inverted "U"-shaped basket in the prior art affects the limiting of the moving contact bridge.

[0006] To achieve the above-mentioned technical objectives, the technical solution of the present invention is as follows: A movable contact bridge retaining structure includes a retainer, a fixing member, a movable contact, and an elastic member, wherein: the retainer includes a first abutting part and a first deforming part, two first deforming parts are integrally connected to two opposite sides of the first abutting part and enclose to form an installation opening, the inner sides of the two first deforming parts respectively form abutting surfaces, and the first deforming parts have a latch; the two ends of the fixing member are respectively connected to the two first deforming parts and close the side of the installation opening away from the first abutting part to prevent the movable contact from falling out of the installation opening, the fixing member includes a buckle, the buckle includes a holding part and a fastening part, two fastening parts are integrally connected to two opposite sides of the holding part, the fastening part forms a latch, and the latch engages with the latch; the movable contact and the elastic member are disposed in the installation opening, the elastic member is connected to the movable contact to provide elastic force to abut the movable contact against the fixing member, the movable contact is limited by the fixing member to prevent the movable contact from falling out of the installation opening.

[0007] Preferably, the movable contact includes a movable contact bridge, which is disposed in the mounting opening and is driven by the elastic member to abut against the fixed member.

[0008] Preferably, the fastener includes a top plate, with positioning openings respectively on the two first deformed parts, and two positioning bosses formed on the two opposite sides of the top plate, the positioning bosses cooperating and connecting with the positioning openings.

[0009] Preferably, the moving contact further includes a yoke, which is disposed in the mounting opening. The yoke includes a second abutment portion and a magnetically conductive portion. The two magnetically conductive portions are integrally connected to both ends of the second abutment portion. The second abutment portion is disposed between the elastic member and the moving contact bridge. The two magnetically conductive portions are disposed on opposite sides of the moving contact bridge, and the two sides of the magnetically conductive portion are opposite to the side of the moving contact bridge and the abutment surface, respectively. The end face of the magnetically conductive portion is opposite to the top plate.

[0010] Preferably, the moving contact bridge retaining structure further includes a fixing seat, which is fixedly connected to the contact portion, and one end of the fixing seat abuts against the elastic element.

[0011] Preferably, the elastic element is a spring.

[0012] Preferably, the moving contact bridge retaining structure further includes a drive rod, which is fixedly connected to the fixed base.

[0013] Compared with the prior art, the beneficial effects of the present invention include: during assembly, it is only necessary to place the elastic element and the moving contact element into the mounting port of the cage in sequence, apply a certain pressure to the moving contact element so that the position of the moving contact element is lower than the first deformation part on both sides, and finally install and fix the fixing element. Since the installation structure of the cage is opposite to the structure in the prior art, the fixing element is at the limiting end of the moving contact bridge, which effectively avoids the cage from shaking and ensures the limiting of the moving contact bridge. Attached Figure Description

[0014] Figure 1a This is an exploded view of Embodiment 1 of the moving contact bridge retaining structure provided by the present invention;

[0015] Figure 1b This is a perspective view of Embodiment 1 of the moving contact bridge retaining structure provided by the present invention;

[0016] Figure 1c This is a cross-sectional view of Embodiment 1 of the moving contact bridge retaining structure provided by the present invention;

[0017] Figure 2 This is a perspective view of Embodiment 2 of the moving contact bridge retaining structure provided by the present invention;

[0018] Figure 3 This is a perspective view of Embodiment 3 of the moving contact bridge retaining structure provided by the present invention;

[0019] Reference numerals: 1-retainer, 2-fixed part, 3-moving contact, 4-elastic part, 5-fixed seat, 6-drive rod, 11-first contact part, 12-first deformation part, 13-mounting port, 21-top plate, 22-buckle, 31-moving contact bridge, 32-yoke, 121-stopping surface, 122-positioning port, 123-jaw, 211-positioning boss, 221-holding part, 222-fastening part, 321-second contact part, 322-magnetic part, 2221-jaw foot. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Example 1:

[0022] Please see Figure 1a and Figure 1b This embodiment provides a moving contact bridge retaining structure, which includes a retainer 1, a fixing member 2, a moving contact 3, and an elastic member 4. The moving contact 3 is used to connect the stationary contact of the relay, the fixing member 2 is used to prevent the moving contact 3 from dislodging from the retainer 1, and the elastic member 4 provides elastic force to the moving contact 3.

[0023] The retainer 1 includes a first abutting portion 11 and a first deforming portion 12. The two first deforming portions 12 are integrally connected to the two opposite sides of the first abutting portion 11 and together form a mounting opening 13. The inner sides of the two first deforming portions 12 respectively form a stop surface 121. In this embodiment, the cross-section of the retainer 1 is "U". It should be understood that the cross-sectional shape of the retainer 1 is not limited, as long as it is ensured that the moving contact bridge 31 can move stably within the mounting opening 13.

[0024] The two ends of the fastener 2 are respectively connected to the two first deformable parts 12, and the mounting opening 13 is closed on the side away from the first contact part 11. In this embodiment, the fastener 2 and the retainer 1 together form a rectangular mounting opening 13 with open ends.

[0025] The moving contact 3 and the elastic element 4 are disposed within the mounting opening 13. The elastic element 4 is connected to the moving contact 3 to provide elastic force to press the moving contact 3 against the fixing element 2. The moving contact 3 is limited by the fixing element 2 to prevent it from falling out of the mounting opening 13. Specifically, the moving contact 3 includes a moving contact bridge 31, which is disposed within the mounting opening 13 and is driven by the elastic element 4 to press against the fixing element 2. The two ends of the moving contact bridge 31 are respectively disposed on both sides of the mounting opening 13 to press against and connect the two contacts of the relay.

[0026] In a preferred embodiment, the moving contact bridge retaining structure further includes a fixing seat 5, which is fixedly connected to the contact portion, and one end of the fixing seat 5 abuts against the elastic member 4. The retainer 1 is generally made of metal, while the fixing seat 5 is generally made of plastic. It can be formed by plastic injection molding in an injection mold containing the retainer 1. Therefore, the fixing seat 5 and the retainer 1 are generally integrated.

[0027] In a preferred embodiment, the elastic element 4 is a spring, and one end of the elastic element 4 abuts against the movable contact bridge 31 or the yoke 32, while the other end abuts against the fixed seat 5. In order to prevent the elastic element 4 from coming off from both sides of the mounting port 13, the fixed seat 5 generally has a limiting structure at the point where it abuts against the elastic element 4, which is generally a boss or groove that matches the cross section of the elastic element 4. Similarly, there is a similar structure at the yoke 32 or the movable contact bridge 31 that abuts against the elastic element 4, which can effectively position the elastic element 4, prevent the elastic element 4 from coming off from both sides, and improve the stability of the entire mechanism.

[0028] In a preferred embodiment, the moving contact bridge retaining structure further includes a drive rod 6, which is fixedly connected to the fixed base 5. The function of the drive rod 6 is to connect to the iron core of the relay magnetic circuit. When the control circuit is turned on, the magnetic circuit generates a magnetic field to drive the iron core to move, which in turn drives the drive rod 6 to drive the entire retainer 1. The drive rod 6 is generally made of a metal material with a certain strength. In this embodiment, the connection method between the drive rod 6 and the fixed base 5 is the same as the connection method between the retainer 1 and the fixed base 5, that is, the retainer 1 and the drive rod 6 are placed in the same injection mold for injection molding, thereby connecting the retainer 1 and the drive rod 6 with the fixed base 5.

[0029] In a preferred embodiment, the fastener 2 includes a top plate 21, with two first deformable portions 12 each having a positioning opening 122. Two positioning bosses 211 are formed on opposite sides of the top plate 21, and the positioning bosses 211 are engaged with the positioning openings 122. The side of the positioning opening 122 away from the first contact portion 11 is open, so the top plate 21 is not fixed to the fastening portion 222. The top plate 21 will come out of the mounting opening 13 under the elastic force of the elastic member 4, so it is necessary to fix the two in other ways.

[0030] Specifically, the first deformable part 12 has a slot 123, and the fastener 2 includes a buckle 22. The buckle 22 includes a supporting part 221 and a fastening part 222. The two fastening parts 222 are integrally connected to the two opposite sides of the supporting part 221. The fastening part 222 forms a locking foot 2221, which engages with the slot 123. At the same time, the supporting part 221 abuts against the first deformable part 12 to position the buckle 22. The supporting part 221 is connected to the top plate 21 or the moving contact. 3. The abutment prevents the top plate 21 or the movable contact 3 from coming off the mounting port 13. In this embodiment, the abutment part 221 abuts against the top plate 21. In addition, in order to make the top plate 21 and the positioning port 122 tightly connected, the abutment part 221 can be pressed against the top plate 21 with a certain pressure. Therefore, the abutment part 221 can adopt a "V" shaped structure design. When the buckle 22 is installed, the abutment part 221 will deform and generate a certain elastic force on the top plate 21.

[0031] In a preferred embodiment, the movable contact 3 further includes a yoke 32, which is disposed within the mounting opening 13. The yoke 32 includes a second abutment portion 321 and a magnetically conductive portion 322. The two magnetically conductive portions 322 are integrally connected to both ends of the second abutment portion 321. The second abutment portion 321 is disposed between the elastic member 4 and the movable contact bridge 31. Under the action of the elastic member 4, the second abutment portion 321 abuts against the movable contact bridge 31. Alternatively, the second abutment portion 321 can also be connected to the movable contact bridge 31 by welding or other structures. The two magnetically conductive portions 322 are respectively disposed on two opposite sides of the movable contact bridge 31, and the two sides of the magnetically conductive portions 322 are respectively opposite to the side of the movable contact bridge 31 and the stop surface 121. The end face of the magnetically conductive portion 322 is opposite to the top plate 21. Therefore, the yoke 32 and the top plate 21 surround the four sides of the moving contact bridge 31. When the moving contact bridge 31 abuts against and conducts through the stationary contact, the gap between the end face of the magnetic part 322 and the top plate 21 increases. If a short circuit occurs in the system circuit at this time, a repulsive force is generated at the contact point between the stationary contact and the moving contact bridge 31, which will drive the moving contact bridge 31 to separate from the stationary contact. At this time, the short-circuit current through the moving contact bridge 31 is very large, and the magnetic field strength in the vicinity increases sharply. The yoke 32 and the top plate 21 surrounding the moving contact bridge 31 will generate an attractive force, thereby suppressing the separation of the moving contact bridge 31 from the stationary contact and improving the relay's short-circuit resistance. Generally speaking, both the top plate 21 and the yoke 32 need to have good magnetic permeability, so they are generally made of materials with good magnetic permeability such as pure iron.

[0032] Please see Figure 1a and Figure 1c The working principle of the moving contact bridge retaining structure provided in this embodiment will be briefly explained below. Under normal use, the control circuit is turned on, and the coil generates magnetic force to drive the drive rod 6 to move, thereby moving the retainer 1 toward the stationary contact. The moving contact bridge 31 abuts against the two stationary contacts and makes the two stationary contacts conductive. If there is a short circuit in the system circuit, when a short circuit current passes through the moving contact bridge 31, the generated magnetic lines of force flow through the top plate 21 and the yoke 32. Due to the closure of the magnetic lines of force, an attractive force is generated between them. The yoke 32 and the moving contact bridge 31 are relatively fixed and fixed on the retainer 1. Therefore, the generated attraction force will counteract the electric repulsion between the moving contact bridge 31 and the stationary contact, thereby improving the short circuit withstand capability.

[0033] Example 2:

[0034] Please see Figure 2 Example 2 is basically the same as Example 1, and will not be repeated here. The difference is that there is no yoke 32 structure in this example, so its short-circuit resistance is poor, but its manufacturing cost will also be reduced. Therefore, this structure is more suitable for circuits with low requirements for short-circuit resistance.

[0035] Example 3:

[0036] Please see Figure 3 The implementation of Embodiment 3 is basically the same as that of Embodiment 2, and will not be repeated here. The difference is that there is no top plate 21 structure in this embodiment. The moving contact bridge 31 is limited by the supporting part 221 to prevent the moving contact bridge 31 from coming out of the mounting port 13, which further reduces manufacturing costs, simplifies the production process, and improves production efficiency.

[0037] In summary, the movable contact bridge retaining structure provided by this invention only requires the elastic element and the movable contact element to be placed sequentially into the mounting opening of the retainer during assembly. A certain pressure is applied to the movable contact element to make its position lower than the first deformation parts on both sides. Finally, the fixing element is installed. The assembly process does not rely on high-precision assembly equipment. Since the two ends of the fixing element are respectively connected to the two first deformation parts, the retainer will not wobble, thus not affecting the positioning of the movable contact bridge. Its installation structure is the opposite of the structure in the prior art. The fixing element is at the limiting end of the movable contact bridge, effectively preventing the retainer from wobbling and ensuring the limiting of the movable contact bridge. In addition, since the distance between the fixing element and the first contact part is constant, the elastic force of the elastic element is also constant, and no adjustment is required during assembly. The dimensions of each structure only need to be determined at the beginning of the design, which greatly improves the consistency of the assembly of the retaining structure and reduces assembly errors.

[0038] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A moving contact bridge retaining structure, characterized in that, It includes a cage, a fastener, a moving contact, and an elastic element, among which: The retainer includes a first contact portion and a first deformation portion. The two first deformation portions are integrally connected to the two opposite sides of the first contact portion and enclose each other to form an installation opening. The inner sides of the two first deformation portions respectively form a stop surface. The first deformation portion has a snap-fit ​​opening. The two ends of the fixing member are respectively connected to the two first deformation parts, and the side of the mounting opening away from the first abutment part is closed to prevent the moving contact from coming out of the mounting opening. The fixing member includes a buckle, the buckle includes a supporting part and a fastening part. The supporting part has a V-shaped structure and abuts against the first deformation part to position the buckle. The two fastening parts are integrally connected to the two opposite sides of the supporting part. The fastening part forms a locking foot, and the locking foot engages with the locking opening. The movable contact and the elastic member are disposed in the mounting port. The elastic member is connected to the movable contact to provide elastic force to abut the movable contact against the fixing member. The movable contact is limited by the fixing member to prevent the movable contact from coming out of the mounting port. The movable contact includes a movable contact bridge, which is disposed in the mounting opening and is driven by the elastic member to abut against the fixing member; The fastener includes a top plate, with positioning openings on the two first deformed portions. The side of the positioning opening away from the first contact portion is an open structure. Two positioning bosses are formed on two opposite sides of the top plate, and the positioning bosses are connected to the positioning openings. The abutting portion abuts against the top plate.

2. The moving contact bridge retaining structure according to claim 1, characterized in that, The movable contact also includes a yoke, which is disposed in the mounting opening. The yoke includes a second abutment portion and a magnetically conductive portion. The two magnetically conductive portions are integrally connected to both ends of the second abutment portion. The second abutment portion is disposed between the elastic member and the movable contact bridge. The two magnetically conductive portions are disposed on opposite sides of the movable contact bridge, and the two sides of the magnetically conductive portion are respectively opposite to the side of the movable contact bridge and the abutment surface. The end face of the magnetically conductive portion is opposite to the top plate.

3. The moving contact bridge retaining structure according to claim 1, characterized in that, The moving contact bridge retaining structure also includes a fixing seat, which is fixedly connected to the abutting part, and one end of the fixing seat abuts against the elastic element.

4. The moving contact bridge retaining structure according to claim 1, characterized in that, The elastic element is a spring.

5. The moving contact bridge retaining structure according to claim 3, characterized in that, The moving contact bridge retaining structure also includes a drive rod, which is fixedly connected to the fixed base.

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