Bridge type contact structure and relay

Abstract

The utility model discloses a bridge type contact structure and a relay, comprising a contact support, a moving contact bridge arranged on the contact support, and a static contact assembly arranged corresponding to the moving contact bridge, the static contact assembly comprises two static contacts; the first yoke is located between the two static contacts, and the second yoke is connected with the moving contact bridge and / or the contact support through a plug-in structure; and when the movable contact and the static contact are closed, the two ends of the first yoke are respectively contacted with or in clearance fit with the two ends of the second yoke. According to the utility model, the movable contact and the static contact are prevented from being bonded due to electric arc generated by repulsion of the contacts. The second yoke is connected with the moving contact bridge and / or the contact support through a plug-in structure, so that the installation mode of the second yoke is simple and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a bridge contact structure and a relay. Background Art

[0002] The bridge contact structure of the prior art is usually composed of contact supports, static contacts, moving contact bridges, etc. In the closed state, the moving contact on the moving contact bridge contacts the static contacts on the static contacts on both sides to form a conductive path. The contact spring provides sufficient contact pressure to ensure reliable contact between the moving and static contacts. When a fault current such as a short-circuit current appears in the conductive circuit, there is a Holm force (repulsion) between the contacts. When the repulsion exceeds the contact spring force, the moving and static contacts will separate, generating an arc and burning the contacts. After the contacts are separated, the Holm force disappears, and the moving contact re-contacts the static contact under the action of the contact spring. Due to the high temperature of the arc, the contact surface softens or melts. The reclosed moving and static contacts are prone to wire adhesion, resulting in failure of the switch action. Continuous repulsion and arcing may even cause the switch to explode, leading to more serious consequences.

[0003] The contact support is usually driven by a push rod connected to the moving iron of the magnetic circuit. To solve the above problem, the existing technology usually adopts the method of enlarging the coil of the magnetic circuit to improve the holding force of the moving iron core, but enlarging the coil will increase the size of the relay. Utility Model Content

[0004] The utility model aims at solving the technical problems in the prior art and provides a bridge contact structure and a relay, which can prevent the contacts from being repelled by the Holm force without enlarging the coil.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a bridge-type contact structure, including a contact support, a moving contact bridge installed on the contact support, and a static contact assembly arranged corresponding to the moving contact bridge, the static contact assembly including two static contacts, the two static contacts are respectively provided with static contacts, and the two ends of the moving contact bridge are respectively provided with moving contacts arranged opposite to the static contacts on the two static contacts; it also includes a first yoke and a second yoke, the first yoke is located between the two static contacts, and the second yoke is connected to the moving contact bridge and / or the contact support through a plug-in structure; when the moving contact and the static contact are closed, the two ends of the first yoke are respectively in contact with the two ends of the second yoke or are in a clearance fit.

[0006] Furthermore, the contact support is provided with an installation groove, which is through-shaped in the length direction of the moving contact bridge, and the middle part of the moving contact bridge and the second yoke are respectively located in the installation groove, and the plug-in structure includes sockets respectively provided at the two ends of the contact support corresponding to the second yoke, and the sockets are connected to the installation groove, and the two ends of the second yoke are respectively inserted into the corresponding sockets.

[0007] Furthermore, the middle portion of the moving contact bridge is provided with limiting grooves on both sides in the width direction thereof, and the groove walls on both sides of the mounting groove in the width direction of the moving contact bridge are respectively inserted into the limiting grooves on both sides of the moving contact bridge.

[0008] Furthermore, the middle part of the second yoke is located on the side of the moving contact bridge facing away from the static contact, and the two ends of the second yoke are respectively located on both sides of the moving contact bridge in the width direction and facing the first yoke; a contact spring is provided between the middle part of the second yoke and the groove wall on the side of the mounting groove away from the moving contact bridge, and the middle part of the second yoke is provided with a first limiting protrusion which is socketed with one end of the contact spring, and the groove wall on the side of the mounting groove away from the static contact is provided with a second limiting protrusion which is socketed with the other end of the contact spring.

[0009] Furthermore, the contact support includes a first bracket and a second bracket distributed along the thickness direction of the moving contact bridge, and the first bracket and the second bracket are connected to form the installation groove.

[0010] Furthermore, the plug-in structure includes a positioning groove and a positioning protrusion that are plugged into each other, one of the positioning groove and the positioning protrusion is arranged in the middle position of the moving contact bridge, and the other of the positioning groove and the positioning protrusion is arranged in the middle of the second yoke.

[0011] Furthermore, the moving contact bridge, the static contact assembly, the first yoke and the second yoke are respectively provided in plurality, and the plurality of moving contact bridges are arranged at intervals along the length direction of the contact support, the plurality of static contact assemblies and the plurality of the second yokes respectively correspond one-to-one to the plurality of moving contact bridges, and the plurality of the first yokes respectively correspond one-to-one to the plurality of the second yokes.

[0012] Furthermore, the first yoke and / or the second yoke is U-shaped; the two static contacts respectively include a contact body and a contact lead-out piece, the contact body is provided with the static contact point, and the contact lead-out pieces of the two static contacts are respectively provided at the relative inner ends or the relative outer ends of the contact bodies of the two static contacts, and extend in a direction away from the contact support.

[0013] The present invention further provides a relay, comprising a base and the bridge contact structure as described above in the present invention, wherein the bridge contact structure is located in the base, the static contact is inserted into the base, and the first yoke is installed on the base; the relay also comprises a magnetic circuit portion, the magnetic circuit portion is provided with a push rod, and the push rod cooperates with the contact support to push the contact support to move, so that the moving contact and the static contact are closed or opened.

[0014] Furthermore, the first yoke is inserted into the base, and the first yoke is U-shaped, with both ends of the first yoke inserted into the base from bottom to top, and a receiving groove is provided at the bottom end of the base corresponding to the middle of the first yoke.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Because the present invention also includes the second yoke and the first yoke, when a fault current occurs in the circuit, the current flowing through the moving contact bridge magnetizes the second yoke and the first yoke, generating a mutually attractive magnetic force that offsets the Holm force generated between the contacts, thereby preventing the contacts from repelling and arcing, which could cause the moving and static contacts to stick together. Furthermore, the second yoke of the present invention is connected to the moving contact bridge and / or the contact support using a plug-in structure, making installation of the second yoke simple and convenient, eliminating the need for complex processes such as riveting.

[0017] 2. The second yoke is further limited by a contact spring, which can improve the stability of the cooperation between the second yoke, the moving contact bridge and the contact support, and use the contact spring to achieve contact overtravel and dynamic closing pressure.

[0018] 3. The contact support includes a first bracket and a second bracket distributed along the thickness direction of the moving contact bridge. The first bracket and the second bracket are connected and enclosed to form the installation groove, which makes the installation of the moving contact bridge and the second yoke more convenient and also makes the height of the contact support unnecessary to be made relatively large.

[0019] 4. The first yoke is inserted into the base, making the installation of the first yoke simple and convenient.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the bridge contact structure and relay of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an exploded schematic diagram of the bridge contact structure of the present invention (including the base);

[0022] Figure 2 This is an exploded schematic diagram of a single set of bridge contact structures of the present utility model;

[0023] Figure 3 This is a structural schematic diagram of a single-group bridge contact structure of the utility model in a contact closed state;

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the dynamic component of the utility model;

[0025] Figure 5 It is a top view of the dynamic component of the utility model;

[0026] Figure 6 yes Figure 5 AA section view;

[0027] Figure 7 yes Figure 5 BB cross-sectional view;

[0028] Figure 8 This is an exploded schematic diagram of another single-group bridge contact structure of the present invention;

[0029] Figure 9 It is an exploded schematic diagram of the base and the first yoke of the utility model;

[0030] Figure 10 This is a top view of the base and the bridge contact structure of the utility model in the assembled state (excluding the first bracket);

[0031] Figure 11 yes Figure 10 CC cross-sectional view;

[0032] Figure 12 It is a cross-sectional view of the relay of the present utility model;

[0033] In the figure, 1. moving contact bridge; 11. moving contact; 12. limiting groove; 13. positioning protrusion; 2. static contact; 21. static contact; 22. contact lead-out piece; 3. second yoke; 31. first limiting protrusion; 4. first yoke; 5. contact support; 51. first bracket; 52. second bracket; 53. mounting groove; 54. second limiting protrusion; 55. socket; 6. contact spring; 7. base; 71. accommodating groove; 8. magnetic circuit part; 81. moving iron core; 82. push rod; 9. housing; 10. middle cover. DETAILED DESCRIPTION

[0034] In the present invention, the terms "first", "second", etc. are only used to distinguish similar objects, rather than to describe a specific order or precedence, and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship.

[0035] See Figures 1-8As shown, the present invention provides a bridge-type contact structure comprising a contact support 5, a movable contact bridge 1 mounted on the contact support 5, and a stationary contact assembly corresponding to the movable contact bridge 1. The stationary contact assembly comprises two stationary contacts 2, each of which is provided with a stationary contact point 21. The movable contact bridge 1 is provided at each end with a movable contact 11 positioned opposite the stationary contacts 21 on the two stationary contacts 2. The movable contact 11 can be provided separately from the movable contact bridge 1 and electrically connected together by riveting or other means, or can be integrally formed. Similarly, the stationary contact 21 can be provided separately from the stationary contact 2 and electrically connected together by riveting or other means, or can be integrally formed.

[0036] The present utility model also includes a first yoke 4 and a second yoke 3. The first yoke 4 is located between the two static contacts 2. The second yoke 3 is connected to the moving contact bridge 1 and / or the contact support 5 through a plug-in structure. The middle part of the second yoke 3 is located on the side of the moving contact bridge 1 facing away from the static contact 2. The two ends of the second yoke 3 are respectively located on both sides of the moving contact bridge 1 in the width direction and face the first yoke 4. A first yoke 4 is arranged between the two static contacts 2. The two ends of the first yoke 4 are respectively opposite to the two ends of the second yoke 3, and when the moving contact 11 and the static contact 21 are closed, the two ends of the first yoke 4 are respectively in contact with or in a gap fit with the two ends of the second yoke 3. Specifically, in this embodiment, when the moving contact 11 and the static contact 21 are closed, the two ends of the first yoke 4 are respectively in a gap fit with the two ends of the second yoke 3, such as Figure 3 As shown, when the movable contact 11 and / or the stationary contact 21 wears, the clearance between the two ends of the second yoke 3 and the two ends of the first yoke 4 can provide space, so that the movable contact bridge 1 can continue to move in the contact closing direction under the action of the contact spring 6 described below, thereby compensating for contact wear and ensuring that the movable contact 11 and the stationary contact 21 can still be effectively closed.

[0037] In this embodiment, the contact support 5 is provided with a mounting slot 53 that extends through the length of the movable contact bridge 1. The middle portion of the movable contact bridge 1 and the second yoke 3 are respectively located within the mounting slot 53. The plug-in structure includes sockets 55 provided at the ends of the contact support 5 corresponding to the second yoke 3. The sockets 55 communicate with the mounting slot 53, and the ends of the second yoke 3 are respectively inserted into the corresponding sockets 55. In this embodiment, the middle portion of the movable contact bridge 1 is provided with limiting slots 12 on both sides of its width. The side walls of the mounting slot 53 on the width of the movable contact bridge 1 are respectively inserted into the limiting slots 12 on both sides of the movable contact bridge 1. This prevents the movable contact bridge 1 from shifting along its length.

[0038] In other embodiments, the plug-in structure includes a positioning groove and a positioning protrusion that are plugged into each other, one of the positioning groove and the positioning protrusion is provided in the middle of the moving contact bridge 1, and the other of the positioning groove and the positioning protrusion is provided in the middle of the second yoke 3. Specifically, Figure 8 As shown, a positioning groove (not shown) is provided in the middle of the second yoke 3 on the side facing the movable contact bridge 1, and a positioning protrusion 13 is provided in the middle of the movable contact bridge 1 on the side facing the second yoke 3. In this way, the second yoke 3 can be used to limit the movable contact bridge 1 to prevent the movable contact bridge 1 from shifting in its longitudinal direction, thereby eliminating the need for the limiting groove 12 on the movable contact bridge 1.

[0039] In this embodiment, a contact spring 6 is disposed between the middle portion of the second yoke 3 and the side of the mounting slot 53 facing away from the movable contact bridge 1. Specifically, a first position-limiting protrusion 32 is provided in the middle portion of the second yoke 3, which sleeves and engages with one end of the contact spring 6. A second position-limiting protrusion 54 is provided in the side of the mounting slot 53 facing away from the stationary contact 2, which sleeves and engages with the other end of the contact spring 6. This allows the contact spring 6 to be retained between the first position-limiting protrusion 32 and the second position-limiting protrusion 54.

[0040] like Figure 1 As shown, the contact support 5 includes a first bracket 51 and a second bracket 52 distributed along the thickness of the moving contact bridge 1. The first bracket 51 and the second bracket 52 are connected and enclose a mounting groove 53. The second stopper 54 is provided on the first bracket 51, and the socket 55 is provided on the second bracket 52. The contact support 5 is assembled from the first bracket 51 and the second bracket 52, which facilitates the installation of the moving contact bridge 1, the second yoke 3, and the contact spring 6. During installation, the moving contact bridge 1 is first placed on the second bracket 52, and then the second yoke 3 is placed on the moving contact bridge 1, with the two ends of the second yoke 3 inserted into the corresponding two sockets 55 on the second bracket 52. Then, one end of the contact spring 6 is inserted into the first stopper 32 of the second yoke 3. Finally, the first bracket 51 is connected to the second bracket 52. The connection method between the two can be one or more of screw connection, snap connection, ultrasonic connection, etc. After installation, the other end of the contact spring 6 is inserted into the second stopper 54.

[0041] In this embodiment, the movable contact bridge 1, the stationary contact assembly, the second yoke 3, and the first yoke 4 are each provided in plurality. The plurality of movable contact bridges 1 are arranged at intervals along the length direction of the contact support 5. The plurality of stationary contact assemblies and the plurality of second yokes 3 correspond one-to-one with the plurality of movable contact bridges 1, and the plurality of first yokes 4 correspond one-to-one with the plurality of second yokes 3. Therefore, the present invention constitutes a multi-group bridge contact structure.

[0042] In this embodiment, the second yoke 3 and the first yoke 4 are each U-shaped, but the shapes of the first yoke 4 and the second yoke 3 are not limited to the U. The two stationary contacts 2 each include a contact body and a contact lead 22. The contact body is provided with a stationary contact point 21. The contact lead 22 of the two stationary contacts 2 is respectively provided at the opposite outer ends or the opposite inner ends of the contact body of the two stationary contacts 2 and extends away from the contact support 5.

[0043] The present invention provides a bridge-type contact structure. When a fault current (such as a short-circuit current) occurs in the circuit, the current flowing through the movable contact bridge 1 magnetizes the second yoke 3 and the first yoke 4, generating a mutually attractive magnetic force. This offsets the Holm force generated between the contacts, thereby preventing the contacts from repelling and generating an arc that could cause the movable contact 11 to adhere to the stationary contact 21. Furthermore, the second yoke 3 of the present invention is connected to the contact support 5 and / or the movable contact bridge 1 using a plug-in structure and is tightened against the movable contact bridge 1 by a contact spring 6. This makes installation of the second yoke 3 simple, convenient, and reliable, eliminating the need for complex processes such as riveting.

[0044] See Figures 1-12 As shown, a relay of the present invention includes a base 7 and a magnetic circuit portion 8 provided above the base 7, and also includes a bridge contact structure of the present invention as described above, the bridge contact structure is located in the base 7, and the static contact 2 is inserted into the base 7, and the first yoke 4 is installed on the base 7; the magnetic circuit portion 8 has a moving iron core 81, and the moving iron core 81 is coaxially connected to a push rod 82, one end of the push rod 82 cooperates with the contact support 5 of the moving component to drive the contact support 5 to move, so that the moving contact 11 and the static contact 21 are closed or opened.

[0045] In this embodiment, both ends of the first yoke 4 are inserted into the base 7 from bottom to top, and a receiving groove 71 is provided at the bottom end of the base 7 corresponding to the middle portion of the first yoke 4. This makes the installation of the first yoke 4 simpler and more convenient, and to prevent the first yoke 4 from falling off, the first yoke 4 can be further bonded to the base 7 with glue.

[0046] In this embodiment, the utility model also includes an outer shell 9 and a middle cover 10. The middle cover 10 is connected to the base 7 and encloses a contact cavity. The outer shell 9 and the middle cover 10 are connected to form a magnetic circuit cavity. The above-mentioned bridge contact structure is arranged in the contact cavity, the magnetic circuit part 8 is arranged in the magnetic circuit cavity, and the coil lead-out piece of the magnetic circuit part 8 is led out from the bottom end of the base 7.

[0047] For the construction and working principle of the bridge contact structure and relay, please refer to the previous description, which will not be repeated here.

[0048] The bridge contact structure and relay of the present invention, the parts not involved (such as the specific structure and working principle of the magnetic circuit part 8, etc.) are the same as those in the prior art or can be implemented by using the prior art.

[0049] The above embodiments are only used to further illustrate a bridge contact structure and relay of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A bridge contact structure comprising a contact support, a movable contact bridge mounted on the contact support, and a stationary contact assembly corresponding to the movable contact bridge, wherein the stationary contact assembly includes two stationary contacts, each of which is provided with a stationary contact point, and each end of the movable contact bridge is provided with a movable contact arranged opposite to the stationary contacts on the two stationary contacts; characterized in that: It also includes a first yoke and a second yoke, the first yoke is located between the two static contacts, and the second yoke is connected to the moving contact bridge and / or the contact support through a plug-in structure; when the moving contact and the static contact are closed, the two ends of the first yoke are respectively in contact with the two ends of the second yoke or are in a clearance fit.

2. The bridge contact structure according to claim 1, characterized in that: The contact support is provided with a mounting groove, which is through-shaped in the length direction of the moving contact bridge. The middle part of the moving contact bridge and the second yoke are respectively located in the mounting groove. The plug-in structure includes sockets respectively provided at the two ends of the contact support corresponding to the second yoke. The sockets are connected to the mounting groove, and the two ends of the second yoke are respectively inserted into the corresponding sockets.

3. The bridge contact structure according to claim 2, characterized in that: The middle part of the movable contact bridge is provided with limiting grooves on both sides in the width direction thereof, and the groove walls on both sides of the mounting groove in the width direction of the movable contact bridge are respectively inserted into the limiting grooves on both sides of the movable contact bridge.

4. The bridge contact structure according to claim 2, wherein: The middle part of the second yoke is located on the side of the moving contact bridge facing away from the static contact, and the two ends of the second yoke are respectively located on both sides of the moving contact bridge in the width direction and facing the first yoke; a contact spring is arranged between the middle part of the second yoke and the groove wall on the side of the installation groove away from the moving contact bridge, and the middle part of the second yoke is provided with a first limiting protrusion which is sleeved and matched with one end of the contact spring, and the groove wall on the side of the installation groove away from the static contact is provided with a second limiting protrusion which is sleeved and matched with the other end of the contact spring.

5. The bridge contact structure according to claim 2, characterized in that: The contact support includes a first bracket and a second bracket distributed along the thickness direction of the moving contact bridge. The first bracket and the second bracket are connected and enclose the installation groove.

6. The bridge contact structure according to any one of claims 1 to 5, characterized in that: The plug-in structure includes a positioning groove and a positioning protrusion that are plugged into each other, one of the positioning groove and the positioning protrusion is arranged in the middle position of the moving contact bridge, and the other one is arranged in the middle of the second yoke.

7. The bridge contact structure according to claim 1, characterized in that: The moving contact bridge, the static contact assembly, the first yoke and the second yoke are respectively provided in plurality, and the plurality of moving contact bridges are arranged at intervals along the length direction of the contact support, the plurality of static contact assemblies and the plurality of second yokes respectively correspond one-to-one to the plurality of moving contact bridges, and the plurality of first yokes respectively correspond one-to-one to the plurality of second yokes.

8. The bridge contact structure according to claim 1, characterized in that: The first yoke and / or the second yoke are U-shaped; the two static contacts respectively include a contact body and a contact lead-out piece, the contact body is provided with the static contact point, and the contact lead-out pieces of the two static contacts are respectively provided at the relative inner ends or the relative outer ends of the contact bodies of the two static contacts, and extend in the direction away from the contact support.

9. A relay comprising a base, characterized in that: It also includes a bridge contact structure as described in any one of claims 1 to 8, wherein the bridge contact structure is located in the base, and the static contact is inserted into the base, and the first yoke is installed on the base; it also includes a magnetic circuit part, and the magnetic circuit part is provided with a push rod, which cooperates with the contact support to push the contact support to move, so that the moving contact and the static contact are closed or disconnected.

10. The relay according to claim 9, characterized in that: The first yoke is inserted into the base and is U-shaped. Both ends of the first yoke are inserted into the base from bottom to top. A receiving groove is provided at the bottom end of the base corresponding to the middle of the first yoke.

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