Contact structure and electromagnetic relay

Abstract

The utility model discloses a contact structure and an electromagnetic relay, the contact structure comprises 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 comprises two static contacts, the two static contacts respectively comprise a contact main body and a contact leading-out sheet, each contact main body is provided with a static contact point, and the contact leading-out sheet is provided with a contact leading-out sheet. Two ends of the movable contact bridge are respectively provided with a movable contact; the contact leading-out sheets of the two static contacts are respectively arranged at the opposite outer ends of the contact main bodies of the two static contacts and extend in the direction far away from the moving contact bridge; each contact main body is connected with a flash barrier, and the flash barriers carry out arc blocking on the contact leading-out sheets and the parts, between the static contacts and the contact leading-out sheets, of the contact main bodies. According to the utility model, the distance between the contact leading-out sheets of the two static contacts reaches the farthest distance, thereby facilitating heat radiation and greatly reducing the heat effect between the contacts; and when the contact is broken and an electric arc is generated, the electric arc does not ablate the contact leading-out sheet and the part of the contact main body outside the static contact.

Description

Technical Field

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

[0002] The existing bridge contact structure typically includes a contact support, a movable contact bridge mounted on the contact support, and a stationary contact assembly corresponding to the movable contact bridge. The stationary contact assembly includes two stationary contacts, which are distributed along the length of the movable contact bridge and on one side of the thickness of the movable contact bridge. Each of the two stationary contacts has a stationary contact point, and each end of the movable contact bridge has a movable contact point positioned opposite the stationary contact points on the two stationary contacts. The contact lead blades of the two stationary contacts are usually arranged relatively close together, but the operation of the static contacts generates heat, and the close proximity of the contact lead blades of the two stationary contacts is not conducive to heat dissipation. If the contact lead-out pieces of the two static contacts are set farther apart, although the heat dissipation space is increased, when a fault current such as a short-circuit current occurs in the conductive circuit, a Holm force (repulsion) exists between the contacts. When the repulsion exceeds the contact spring force, the moving and static contacts will separate, generating an arc. The arc is usually led to the outside of the contacts, burning the part of the static contact outside the static contact and the contact lead-out piece, causing the relevant parts of the static contact to soften or melt, thus posing a safety hazard. Utility Model Content

[0003] The utility model aims at solving the technical problems existing in the prior art and provides a contact structure and an electromagnetic relay, which, through structural improvement, not only facilitates heat dissipation of the static contact, but also solves the problem of arc erosion of the static contact.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a 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 arranged in parallel on the same side of the moving contact bridge, the two static contacts respectively including a contact body and a contact lead-out piece, each contact body is respectively provided with a static contact point, 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; the contact lead-out pieces of the two static contacts are respectively arranged at the opposite outer ends of the contact bodies of the two static contacts, and extend in the direction away from the moving contact bridge; each contact body is respectively connected to an arc isolation plate, which performs arc isolation on the contact lead-out piece and the portion of the contact body between the static contact point and the contact lead-out piece.

[0005] Furthermore, the arc isolation plate is made of magnetic conductive material.

[0006] Furthermore, the arc-isolating plate is provided with a first arc-strike angle at one end away from the static contact, which extends obliquely in the direction away from the moving contact bridge; and the moving contact bridge is provided with a second arc-strike angle at both ends in its length direction, which extends obliquely in the direction away from the static contact.

[0007] Furthermore, the first arc-starting angle is provided with an elongated hole, and the elongated hole is arranged along the extending direction of the first arc-starting angle.

[0008] Furthermore, the arc isolation plate is riveted on the contact body, and the arc isolation plate is located on the side of the contact body facing the moving contact bridge, and an arc-shaped notch adapted to the outer side of the static contact is provided at one end of the arc isolation plate facing the static contact.

[0009] Furthermore, an arc blowing structure is provided at both ends of the moving contact bridge, and the arc blowing structure includes two first magnetic conductive plates, which are respectively located on both sides of the width direction of the moving contact bridge and are arranged opposite to each other, and one or more of the moving contact, static contact and the contact gap between the moving contact and the static contact are located between the two first magnetic conductive plates.

[0010] Furthermore, the arc blowing structure also includes a second magnetic conductive plate, which is located on the outside of the moving contact bridge in the length direction and supports the two first magnetic conductive plates, so that the arc blowing structure forms a U-shaped cover.

[0011] Furthermore, the second magnetic conductive plate is provided with an exhaust notch, and the exhaust notch is located at an end of the second magnetic conductive plate away from the static contact.

[0012] Furthermore, the two first magnetic conductive plates are respectively replaced by permanent magnets, and the oppositely arranged permanent magnets have opposite magnetic poles.

[0013] Furthermore, a contact spring is provided between the moving contact bridge and the contact support, and the contact spring is located on the side of the moving contact bridge facing away from the static contact; the moving contact bridge and the static contact assembly are respectively provided in plurality, and the plurality of moving contact bridges are arranged along the length direction of the contact support, and the width direction of each moving contact bridge is consistent with the length direction of the contact support, and the static contact assembly corresponds one to one to the moving contact bridge.

[0014] The present invention further provides an electromagnetic relay, comprising the contact structure described above in the present invention.

[0015] Furthermore, it also includes a base, the contact support is movably arranged in the base, and a reset spring is arranged between the two, and the contact lead-out piece of the static contact is inserted into the base; it also includes a magnetic circuit part, the magnetic circuit part has a moving iron core, and the moving iron core is coaxially connected to a push rod, one end of 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 disconnected.

[0016] Furthermore, an arc blowing structure is provided at both ends of the moving contact bridge, and the arc blowing structure includes two first magnetic conductive plates, which are respectively located on both sides of the width direction of the moving contact bridge and are arranged opposite to each other, and the two first magnetic conductive plates are respectively inserted into the base; one or more of the moving contact, static contact and the contact gap between the moving contact and the static contact are located between the two first magnetic conductive plates.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention locates the contact leads of the two static contacts at the opposite outer ends of the contact bodies of the two static contacts, maximizing the distance between the lead leads. This significantly increases the heat dissipation space between the two, facilitating heat dissipation and significantly reducing the thermal effects between the contacts. Furthermore, the present invention connects arc-isolating plates to each contact body, which are used to arc-block the contact lead leads and the contact body between the static contact and the lead lead leads. This prevents the arc from burning the contact lead leads and the contact body outside the static contact when the moving contact and the static contact are disconnected and an arc is generated. This effectively protects the static contacts and ensures the long-term normal operation of the product.

[0019] 2. The arc isolation plate of the present invention is made of magnetic conductive material, which enables the arc isolation plate to have an arc striking function, helping the arc to move quickly outward and stretch, reducing the arc root staying at the contact, thereby greatly reducing the possibility of contact erosion.

[0020] 3. The present invention further provides a first arc-starting angle on the arc-isolating plate and a second arc-starting angle on the moving contact bridge, which helps to further extend the arc length, increase the arc voltage, and reduce the arcing time. In particular, the elongated hole in the first arc-starting angle can easily cause electric field distortion and breakdown, thereby attracting the arc root to move along the elongated hole away from the contact area, thereby further facilitating arc extinguishing.

[0021] 4. The present invention further provides an arc-blowing structure at each end of the moving contact bridge. The arc-blowing structure includes two first magnetic conductive plates, which are located on opposite sides of the moving contact bridge in the width direction. One or more of the moving contact, the static contact, and the contact gap between the moving and static contacts are located between the two first magnetic conductive plates. This allows the present invention to utilize the magnetic field generated by the magnetization of the two first magnetic conductive plates to assist the arc in rapid outward movement, thereby further reducing the possibility of contact erosion. In particular, the present invention uses the two first magnetic conductive plates as the main magnetic blowing body, making the contact structure of the present invention applicable to both direct current and alternating current applications, without the need to adjust the magnetic pole direction of the magnetic field due to changes in the flow direction of the contact current.

[0022] 5. The arc blowing mechanism further includes a second magnetic plate. This plate isolates the arc from the plastic components outside the plate, preventing damage to the plastic components. It also extinguishes the arc quickly upon contact with the cooler second magnetic plate. Specifically, an exhaust notch on the second magnetic plate facilitates the discharge of high-temperature arc gases within the U-shaped cover, accelerating arc extinguishing.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the contact structure and electromagnetic relay of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an exploded schematic diagram of the contact structure of the present invention (partially not shown);

[0025] Figure 2 yes Figure 1 Side view of

[0026] Figure 3 This is an exploded schematic diagram of the electromagnetic relay of the present utility model;

[0027] Figure 4 It is a structural schematic diagram of the base and contact structure of the utility model in a disassembled state;

[0028] Figure 5 It is a top view of the base and contact structure of the utility model in the assembled state;

[0029] Figure 6 This is a front view of the electromagnetic relay of the present utility model;

[0030] Figure 7 yes Figure 6 EE cross-sectional view;

[0031] Figure 8 yes Figure 6 FF cross-sectional view;

[0032] Figure 9 It is a cross-sectional view of the electromagnetic relay of the present utility model;

[0033] In the figure, 1. contact support; 2. moving contact bridge; 21. moving contact; 22. second arc-striking angle; 3. static contact; 31. contact body; 32. contact lead-out piece; 33. static contact; 4. arc-isolating plate; 41. first arc-striking angle; 411. long strip hole; 42. arc-shaped notch; 5. arc-blowing structure; 51. first magnetic conductive plate; 52. second magnetic conductive plate; 521. exhaust notch; 6. contact spring; 7. base; 8. reset spring; 9. magnetic circuit part; 91. moving iron core; 92. push rod; 10. outer shell; 20 middle cover. DETAILED DESCRIPTION

[0034] In this utility model, the terms "first," "second," etc. are used only to distinguish similar objects, not to describe a specific order or precedence, and should not be understood to indicate or imply relative importance. In addition, in the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0035] See Figure 1-Figure 2 As shown, a contact structure of the present invention includes a contact support 1, a movable contact bridge 2 mounted on the contact support 1, and a static contact assembly corresponding to the movable contact bridge 2. The static contact assembly includes two static contacts 3 arranged in parallel on the same side of the movable contact bridge 2 in the thickness direction. The two static contacts 3 each include a contact body 31 and a contact lead piece 32. Each contact body 31 is provided with a static contact point 33. Both ends of the movable contact bridge 2 are provided with movable contacts 21 arranged opposite to the static contacts 33 on the two static contacts 3. The contact lead pieces 32 of the two static contacts 3 are respectively provided at the opposite outer ends of the contact bodies 31 of the two static contacts 3 and extend in a direction away from the movable contact bridge 2. Each contact body 31 is respectively connected to an arc-isolating plate 4 that is resistant to high temperature and ablation. The arc-isolating plate 4 blocks the arc on the contact lead-out piece 32 and the contact body 31 between the static contact 33 and the contact lead-out piece 32, thereby preventing the arc from burning to the contact lead-out piece 32 and the contact body 31 outside the static contact 33 when the moving contact 21 and the static contact 33 are disconnected.

[0036] In this embodiment, the arc-isolating plate 4 is made of a magnetically conductive material, allowing it to also function as an arc-starting device. This helps the arc quickly move outward and lengthen along the arc-isolating plate 4, reducing the arc root's retention at the contact points, thereby significantly reducing the likelihood of contact erosion. Specifically, the arc-isolating plate 4 is made of low-carbon steel. In other embodiments, the arc-isolating plate is made of ceramic or other high-temperature and erosion-resistant materials.

[0037] As a preferred embodiment, the arc-isolating plate 4 has a first arc-strike angle 41 at one end away from the static contact 33, extending obliquely away from the moving contact bridge 2. The moving contact bridge 2 has second arc-strike angles 22 at each end along its length, extending obliquely away from the static contact 3. This helps further lengthen the arc, increase the arc voltage, and reduce arcing time. Specifically, the first arc-strike angle 41 is provided with an elongated hole 411, which is arranged along the direction of the first arc-strike angle 41. This hole 411 can easily cause electric field distortion and breakdown, thereby attracting the arc root to move along the elongated hole 411 away from the contact area, further facilitating arc extinguishing.

[0038] The arc-isolating plate 4 is riveted to the contact body 31 and is located on the side of the contact body 31 facing the movable contact bridge 2. An arc-shaped notch 42 is provided on the end of the arc-isolating plate 4 facing the static contact 33, which fits within the outer surface of the static contact 33. The connection between the arc-isolating plate 4 and the contact body 31 is not limited to riveting; welding or other fixing methods may also be used.

[0039] In this embodiment, an arc blowing structure 5 is provided at both ends of the moving contact bridge 2, and the arc blowing structure 5 includes two first magnetic conductive plates 51. The two first magnetic conductive plates 51 are respectively located on both sides of the width direction of the moving contact bridge 2 and are arranged opposite to each other. One or more of the moving contact 21, the static contact 33, and the contact gap between the moving contact 21 and the static contact 33 are located between the two first magnetic conductive plates 51. Specifically, in this embodiment, the moving contact 21, the static contact 33, and the contact gap between the moving contact 21 and the static contact 33 are all located between the two first magnetic conductive plates 51. Figure 7 In other embodiments, the two first magnetic conductive plates 51 are respectively replaced by permanent magnets, and the oppositely disposed permanent magnets have opposite magnetic poles.

[0040] The arc-blowing structure 5 also includes a second magnetic conductive plate 52, located longitudinally outside the moving contact bridge 2 and supporting the two first magnetic conductive plates 51, forming a U-shaped cover. Both the first magnetic conductive plates 51 and the second magnetic conductive plate 52 are made of low-carbon steel and are integrally formed.

[0041] As a preferred embodiment, the second magnetic conductive plate 52 is provided with an exhaust notch 521, which is located at the end of the second magnetic conductive plate 52 away from the static contact 3. In this way, the exhaust notch 521 can be used to discharge the high-temperature gas of the arc in the U-shaped cover, thereby accelerating the extinction of the arc.

[0042] In this embodiment, a contact spring 6 is provided between the moving contact bridge 2 and the contact support 1. The contact spring 6 is located on the side of the moving contact bridge 2 facing away from the static contact 3 to provide contact overtravel and contact closing pressure. The moving contact bridge 2 and the static contact assembly are provided in multiple numbers. The multiple moving contact bridges 2 are arranged along the length direction of the contact support 1, and the width direction of each moving contact bridge 2 is consistent with the length direction of the contact support 1. The static contact assembly corresponds to the moving contact bridge 2 one by one. Figure 3 、 Figure 4 Specifically, in this embodiment, the number of the first moving contact bridge 2 and the number of the static contact assemblies are four, respectively, which is applicable to the three-phase four-wire TNC power system and the three-phase five-wire TNS power system.

[0043] The present invention provides a contact structure that maximizes the distance between the contact leads 32 of the two stationary contacts 3, significantly increasing the heat dissipation space between them, thereby facilitating heat dissipation and significantly reducing the thermal effect between the contacts. Furthermore, the present invention connects an arc-isolating plate 4 to each contact body 31. The arc-isolating plate 4 is used to arc-block the contact leads 32 and the portion of the contact body 31 between the stationary contact 33 and the contact leads 32. This ensures that when an arc is generated between the movable contact 21 and the stationary contact 33, the arc drawn outward will not burn into the contact leads 32 and the portion of the contact body 31 outside the stationary contact 33, thereby effectively protecting the stationary contacts 3 and ensuring the long-term normal operation of the product.

[0044] The present invention further incorporates arc-blowing structures 5 at each end of the moving contact bridge 2. This allows the present invention to utilize the magnetic field generated by the magnetized two first magnetic conductive plates 51 of the arc-blowing structure 5 to assist the arc in rapidly moving outward, thereby further reducing the possibility of contact erosion. In particular, the present invention utilizes the two first magnetic conductive plates 51 as the main magnetic blower, making the present contact structure universally applicable to both direct current and alternating current applications, eliminating the need to adjust the magnetic pole direction of the magnetic field due to changes in the contact current flow direction.

[0045] See Figures 1-9 As shown, an electromagnetic relay of the present invention includes the contact structure of the present invention as described above.

[0046] The present invention further includes a base 7, within which the contact support 1 is movably mounted, with a reset spring 8 disposed therebetween to reset the contact support 1 toward the contact opening direction. The contact lead-out piece 32 and each first magnetic conductive plate 51 of the stationary contact 3 are respectively inserted into the base 7. The present invention further includes a magnetic circuit portion 9, which includes a movable iron core 91 coaxially connected to a push rod 92. One end of the push rod 92 engages with the contact support 1 to push the contact support 1, thereby closing or opening the movable contact 21 and the stationary contact 33.

[0047] The present invention further includes a housing 10 and a middle cover 20. The middle cover 20 is connected to the base 7 and covers the contact structure. The housing 10 and the middle cover 20 are connected to form a magnetic circuit cavity. The magnetic circuit portion 9 is disposed in the magnetic circuit cavity, and the coil lead pins of the magnetic circuit portion 9 are led out from the bottom end of the base 7. Specifically, in this embodiment, the housing 10 and the middle cover 20 are connected to form a magnetic circuit cavity, and the housing 10 and the middle cover 20 are snap-connected. Similarly, the middle cover 20 and the base 7 are also snap-connected. However, the connection method between the housing 10 and the middle cover 20, and between the middle cover 20 and the base 7 is not limited to this.

[0048] For details about the structure of the contact and the arc extinguishing principle, please refer to the previous description, which will not be repeated here.

[0049] The contact structure and electromagnetic relay of the present invention, the parts not involved (such as the detailed structure of the magnetic circuit part and its working principle, etc.) are the same as those in the prior art or can be implemented by using the prior art.

[0050] The above embodiments are only used to further illustrate a contact structure and an electromagnetic 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 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, the stationary contact assembly comprising two stationary contacts arranged in parallel on the same side of the movable contact bridge, the two stationary contacts each comprising a contact body and a contact lead, each contact body being provided with a stationary contact point, and movable contacts disposed opposite the stationary contacts on the two stationary contacts at each end of the movable contact bridge; characterized in that: The contact lead-out pieces of the two static contacts are respectively arranged at the opposite outer ends of the contact bodies of the two static contacts and extend in the direction away from the moving contact bridge; each contact body is respectively connected to an arc isolation plate, which isolates the arc for the contact lead-out piece and the part of the contact body between the static contact point and the contact lead-out piece.

2. The contact structure according to claim 1, wherein: The arc isolation plate is made of magnetic conductive material.

3. The contact structure according to claim 2, wherein: The arc-isolating plate has an end away from the static contact with a first arc-strike angle extending obliquely away from the moving contact bridge; the moving contact bridge has two ends in its length direction with second arc-strike angles extending obliquely away from the static contact.

4. The contact structure according to claim 3, characterized in that: The first arc striking angle is provided with an elongated hole, and the elongated hole is arranged along the extending direction of the first arc striking angle.

5. The contact structure according to claim 1, wherein: The arc isolation plate is riveted on the contact body and is located on a side of the contact body facing the moving contact bridge. An end of the arc isolation plate facing the static contact is provided with an arc-shaped notch adapted to the outer side of the static contact.

6. The contact structure according to any one of claims 1 to 5, characterized in that: An arc blowing structure is provided at both ends of the moving contact bridge, and the arc blowing structure includes two first magnetic conductive plates, which are respectively located on both sides of the width direction of the moving contact bridge and arranged opposite to each other, and one or more of the moving contact, static contact and the contact gap between the moving contact and the static contact are located between the two first magnetic conductive plates.

7. The contact structure according to claim 6, characterized in that: The arc blowing structure further includes a second magnetic conductive plate, which is located outside the moving contact bridge in the length direction and supports the two first magnetic conductive plates, so that the arc blowing structure forms a U-shaped cover.

8. The contact structure according to claim 7, characterized in that: The second magnetic conductive plate is provided with an exhaust notch, and the exhaust notch is located at an end of the second magnetic conductive plate away from the static contact.

9. The contact structure according to claim 6, characterized in that: The two first magnetic conductive plates are respectively replaced by permanent magnets, and the oppositely arranged permanent magnets have opposite magnetic poles.

10. The contact structure according to claim 1, wherein: A contact spring is provided between the moving contact bridge and the contact support, and the contact spring is located on the side of the moving contact bridge facing away from the static contact; the moving contact bridge and the static contact assembly are respectively provided in plurality, and the plurality of moving contact bridges are arranged along the length direction of the contact support, and the width direction of each moving contact bridge is consistent with the length direction of the contact support, and the static contact assembly corresponds to the moving contact bridge one by one.

11. An electromagnetic relay, characterized in that: The method comprises the contact structure according to any one of claims 1 to 10.

12. The electromagnetic relay according to claim 11, characterized in that: It also includes a base, the contact support is movably arranged in the base, and a reset spring is arranged between the two, and the contact lead-out piece of the static contact is inserted into the base; it also includes a magnetic circuit part, the magnetic circuit part has a moving iron core, and the moving iron core is coaxially connected to a push rod, one end of 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 disconnected.

13. The electromagnetic relay according to claim 12, wherein: An arc blowing structure is provided at both ends of the moving contact bridge, and the arc blowing structure includes two first magnetic conductive plates, which are respectively located on both sides of the width direction of the moving contact bridge and arranged opposite to each other, and the two first magnetic conductive plates are respectively inserted into the base; one or more of the moving contact, static contact and the contact gap between the moving contact and the static contact are located between the two first magnetic conductive plates.

Images