Relay with arc extinguishing function

Abstract

The utility model discloses a relay with an arc extinguishing function, which comprises a shell, a contact assembly and an arc extinguishing magnetic assembly, the contact assembly and the arc extinguishing magnetic assembly are both arranged in the shell, the contact assembly comprises a static contact piece and a movable contact piece, the static contact piece is provided with at least two static contacts, the two static contacts are arranged along the X direction, and the movable contact piece is provided with a movable contact. A movable contact is arranged at a position, corresponding to each static contact, on the movable contact piece; the arc extinguishing magnetic assembly is located on one side of the static contact in the Y direction and comprises a first magnet and a second magnet, the first magnet and the second magnet are arranged in the X direction and correspond to different static contacts respectively, and the first magnet and the second magnet are opposite in magnetism in the Y direction. According to the relay provided by the utility model, the two magnets with opposite magnetism are arranged on the same side of the contact, so that two magnetic fields with different magnetic pole directions are generated on a single side, electric arcs can be blown towards two sides far away from each other when a large current is broken, and the electric arc of the contact on one side is prevented from being broken down to the contact on the other side to cause contact damage.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a relay with arc extinguishing function. Background Technology

[0002] In some relays, such as magnetic latching relays, a multi-contact structure is typically used to meet the requirements of high-current applications. For example, Chinese patent CN202121321738.X discloses a contact structure for a magnetic latching DC relay. The moving spring has two moving contacts, and the stationary spring has two stationary contacts. A magnet is placed on each of the two opposite sides of the moving spring; the magnets attract each other. Specifically, the arrangement is as follows: one magnet, one moving contact, another moving contact, and another magnet are arranged in a straight line. This multi-contact configuration meets the requirements of high-current and high-voltage applications. Furthermore, the two magnets positioned on the front and rear sides of the two moving contacts address the issues of insufficient high-current withstand capability and weak arc-extinguishing performance.

[0003] However, it has the following problems: when using two magnets to extinguish the arc, an electric arc is generated when the current is interrupted due to the influence of the direction of the magnetic field. Under certain high current and voltage conditions (such as lightning current or large short circuit current), the electric arc on one side of the contact will electrically burn to the other side of the contact. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides a relay with arc extinguishing function. By setting two magnets with opposite magnetic properties on the same side of the contacts, two magnetic fields with different magnetic pole directions are generated on one side. This can cause the arc to blow away from each other when breaking a large current, thus avoiding the arc of one side of the contacts from breaking through to the other side of the contacts and causing contact damage.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] A relay with arc extinguishing function includes:

[0007] case;

[0008] A contact assembly is disposed in the housing. The contact assembly includes a stationary contact and a moving contact. The stationary contact has at least two stationary contacts arranged along the X direction. The moving contact has a moving contact corresponding to each stationary contact.

[0009] An arc-extinguishing magnetic component is disposed in the housing. Along the Y direction, the arc-extinguishing magnetic component is located on one side of the stationary contact. The arc-extinguishing magnetic component includes a first magnet and a second magnet. The first magnet and the second magnet are arranged along the X direction and are respectively arranged corresponding to different stationary contacts. The magnetism of the first magnet and the second magnet is opposite along the Y direction.

[0010] Furthermore, the housing is provided with a first mounting slot and a second mounting slot. The first mounting slot is used to insert the arc-extinguishing magnetic component, and the second mounting slot is used to insert the stationary contact component. When the arc-extinguishing magnetic component is first inserted into the first mounting slot and the stationary contact component is subsequently inserted into the second mounting slot, the stationary contact component restricts and fixes the arc-extinguishing magnetic component in the first mounting slot.

[0011] Furthermore, a magnetic slot is provided on the static contact, and the arc-extinguishing magnetic component is embedded in the magnetic slot. One of the first magnet and the second magnet is provided with a notch, and the magnetic slot and the notch are matched to prevent fooling.

[0012] Furthermore, the arc-extinguishing magnetic component is inserted into the first mounting slot along the X direction, and the stationary contact is inserted into the second mounting slot along the X direction.

[0013] Furthermore, the first mounting slot and the second mounting slot are partially connected, and the first mounting slot and the second mounting slot are arranged along the Y direction and partially offset in the Z direction.

[0014] Furthermore, the stationary contact includes a stationary contact piece and a stationary end foot, which are integrally connected. The stationary contact point and the magnetic slot are both located on the stationary contact piece.

[0015] Furthermore, the first magnet and the second magnet are connected as a single unit.

[0016] Furthermore, the contact assembly also includes a push rod, and the moving contact includes a moving contact piece, a moving end foot, and a moving spring. The moving contact piece and the moving end foot are integrally connected. One end of the moving spring is fixed to the moving contact piece, and the other end of the moving spring is connected to the push rod. Two moving contacts are provided on the moving spring arranged along the X direction.

[0017] Furthermore, there are two moving springs arranged along the Y direction. One end of one moving spring is fixed to one end of the moving contact piece, and the other end of the other moving spring is fixed to the other end of the moving contact piece. The other ends of the two moving springs are arranged relatively close to each other and are simultaneously connected to the push rod. There are four stationary contacts, which are paired up to correspond to two moving contacts on different moving springs. There are two sets of arc-extinguishing magnetic components arranged along the Y direction. Each set of arc-extinguishing magnetic components corresponds to two stationary contacts arranged in a group, and the four stationary contacts along the Y direction are located between the two sets of arc-extinguishing magnetic components. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the relay according to an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the contact assembly and arc extinguishing assembly according to an embodiment of the present invention;

[0020] Figure 3This is a schematic diagram of the moving contact and push rod according to an embodiment of the present invention;

[0021] Figure 4 This is a three-dimensional structural diagram of the static contact and arc-extinguishing assembly according to an embodiment of the present utility model;

[0022] Figure 5 This is a bottom-view schematic diagram of the stationary contact and arc-extinguishing assembly according to an embodiment of the present invention.

[0023] Figure 6 This is a partially enlarged schematic diagram of the static contact component and arc-extinguishing assembly mounted on the housing according to an embodiment of the present invention;

[0024] Figure 7 This is a partially enlarged schematic diagram of the two mounting grooves of the housing in an embodiment of this utility model.

[0025] The meanings of the reference numerals in the attached figures are as follows:

[0026] 1. Housing; 11. First mounting slot; 12. Second mounting slot; 2. Contact assembly; 21. Stationary contact; 211. Stationary contact; 212. Stationary contact piece; 213. Stationary end foot; 214. Magnet slot; 22. Moving contact; 221. Moving contact; 222. Moving contact piece; 223. Moving end foot; 224. Moving spring; 23. Push rod; 3. Arc extinguishing magnetic assembly; 31. First magnet; 32. Second magnet; 33. Notch; 4. Magnetic circuit part; 5. Cover. Detailed Implementation

[0027] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0028] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0030] See Figures 1 to 7This utility model discloses a relay with arc extinguishing function, which solves the problem that in the existing multi-contact arc extinguishing structure, the arc on one side of the contact is prone to electrical erosion to the other side of the contact.

[0031] The relay includes a housing 1, a contact assembly 2, an arc-extinguishing magnetic assembly 3, a magnetic circuit part 4, and a cover 5. The contact assembly 2, the arc-extinguishing magnetic assembly 3, and the magnetic circuit part 4 are all disposed in the housing 1, and the cover 5 is connected to the housing 1 to achieve sealing.

[0032] The contact assembly 2 and the arc-extinguishing magnetic assembly 3 form a contact arc-extinguishing structure, and the housing 1 is used to support the contact arc-extinguishing structure. The contact assembly 2 includes a stationary contact 21 and a moving contact 22. The stationary contact 21 is provided with at least two stationary contacts 211, which are arranged along the X direction. The moving contact 22 is provided with a moving contact 221 corresponding to each stationary contact 211. The arc-extinguishing magnetic assembly 3 is located on one side of the stationary contact 211 along the Y direction. The arc-extinguishing magnetic assembly 3 includes a first magnet 31 and a second magnet 32. The first magnet 31 and the second magnet 32 ​​are arranged along the X direction and are respectively arranged corresponding to different stationary contacts 211. The magnetism of the first magnet 31 and the second magnet 32 ​​is opposite along the Y direction.

[0033] In the above scheme, the first magnet 31 and the second magnet 32 ​​are positioned on the same side of the stationary contact 211, with the first magnet 31 corresponding to the first stationary contact 211 and the second magnet 32 ​​corresponding to the second stationary contact 211. Furthermore, the magnetism of the first magnet 31 and the second magnet 32 ​​is opposite along the Y-direction; that is, the direction of the magnetic field generated by the first magnet 31 is different from the direction of the magnetic field generated by the second magnet 32. Thus, during arc extinguishing, the arc blowing direction at different contact points is different, both blowing towards the relatively outer sides of the two contact points. Specifically… Figure 5 When the directions shown are for reference, the X direction is the up-down direction and the Y direction is the left-right direction. Under the action of the opposite magnetic fields generated by the first magnet 31 and the second magnet 32, the arc blowing direction at the upper contact point is upward (meaning the arc blows upward, not vertically upward; it can be an upward, arc-shaped, or vertically upward trend that is getting further and further away from the lower contact point), and the arc blowing direction at the lower contact point is downward (meaning the arc blows downward, not vertically downward; it can be an downward, arc-shaped, or vertically downward trend that is getting further and further away from the upper contact point), thereby preventing the arc from one contact point from burning onto the other contact point.

[0034] It should be noted that since the moving contact 221 and the stationary contact 211 are in corresponding positions and can conduct electricity, when the position of the moving contact 221 is taken as a reference, the arc-extinguishing magnetic component 3 along the Y direction can also be considered to be located on one side of the moving contact 221. The first magnet 31 and the second magnet 32 ​​can also be considered to be arranged corresponding to different stationary contacts 211 respectively. Regardless of whether the arc is emitted from the moving contact 221 or the stationary contact 211, the two opposite magnetic fields generated by the first magnet 31 and the second magnet 32 ​​can both play the role of blowing the arc outward.

[0035] Therefore, in this invention, by setting two magnets with opposite magnetic properties on the same side of the two contacts, two magnetic fields with different magnetic pole directions are generated on one side. This allows the arc to blow away from each other when breaking a large current, preventing the arc of one contact from breaking through to the other contact. The arc running space is larger, and it will not cause the arc to damage the contacts. The arc extinguishing effect is good, which helps to increase the service life of the relay.

[0036] In this embodiment, the relay is preferably a magnetic latching relay. For ease of understanding, as a specific example, the contact assembly 2 further includes a push rod 23. The moving contact 22 includes a moving contact piece 222, a moving end 223, and a moving spring 224. The moving contact piece 222 and the moving end 223 are integrally connected. One end of the moving spring 224 is fixed to the moving contact piece 222, and the other end of the moving spring 224 is connected to the push rod 23. Two moving contacts 221 arranged along the X direction are provided on the moving spring 224. The magnetic circuit part 4 includes an armature. The system comprises a winding frame, an iron core, a coil, and yokes. The winding frame is housed within a housing 1, the iron core passes through the winding frame, the coil is wound around the circumferential outer side of the iron core, and two yokes are connected to the two ends of the iron core. An armature assembly is rotatably mounted within the housing 1 about the X-axis, and is located between the two yokes. The armature assembly includes a magnetic armature plate, a permanent magnet, and a plastic component. The magnetic armature plate and the permanent magnet are mounted on the plastic component, which is rotatably mounted. A connecting block protrudes from the plastic component and is used to connect with a push rod 23. When a forward or reverse excitation current is applied to the coil, the armature assembly rotates about the X-axis, driving the push rod 23 to move in the Z-axis direction via the connecting block. The push rod 23 drives a moving spring 224, causing the moving contact 221 to connect or disconnect from the stationary contact 211.

[0037] Of course, other structures can be used for the magnetic circuit part 4, such as a sliding armature assembly that drives the push rod 23 to move. The inventive point of this utility model does not lie in the structure of the magnetic circuit part 4, and therefore the magnetic circuit part 4 is not limited here.

[0038] It is understood that the relay in this solution can also be other types of relays, as long as the contact arc extinguishing structure of this utility model is adopted.

[0039] Preferably, the first magnet 31 and the second magnet 32 ​​can be connected as a whole by means of pasting or welding with a plastic intermediate component, thereby forming a single irregularly shaped magnet. This is beneficial for production and installation and avoids the situation of incorrect magnetic field direction.

[0040] Of course, in other examples, the connection between the first magnet 31 and the second magnet 32 ​​can be varied, or the first magnet 31 and the second magnet 32 ​​can be installed on the housing 1 respectively, without limitation here.

[0041] See Figures 2 to 5 In this embodiment, preferably, two movable springs 224 are provided, arranged along the Y direction. One end of one movable spring 224 is fixed to one end of the movable connecting piece 222, and one end of the other movable spring 224 is fixed to the other end of the movable connecting piece 222. The other ends of the two movable springs 224 are arranged relatively close to each other and are simultaneously connected to the push rod 23. Figure 3 When referring to the indicated direction, the push rod 23 is positioned at the middle of the movable contact piece 222. The left end of the left movable spring 224 is fixed to the left end of the movable contact piece 222, and the right end of the right movable spring 224 is fixed to the right end of the movable contact piece 222. The right end of the left movable spring 224 and the left end of the right movable spring 224 are respectively connected to two opposite slots on the push rod 23. In other words, the two movable springs 224 are located on opposite sides of the push rod 23.

[0042] Four stationary contacts 211 are provided, and the four stationary contacts 211 are paired up to correspond to two moving contacts 221 on different moving springs 224. Two sets of arc-extinguishing magnetic components 3 are provided, and the two sets of arc-extinguishing magnetic components 3 are arranged along the Y direction. Each set of arc-extinguishing magnetic components 3 corresponds to two stationary contacts 211, and the four stationary contacts 211 are located between the two sets of arc-extinguishing magnetic components 3 along the Y direction. The four contacts can realize the flow of larger current, and the structure is simple. The large distance between the different arc-extinguishing magnetic components 3 facilitates the arrangement.

[0043] Specifically, the four stationary contact points 211 on the XY plane are arranged in a rectangular pattern. Figure 2When referring to the direction and position of the push rod 23, the two stationary contacts 211 on the left side of the push rod 23 form a group, corresponding to the two moving contacts 221 on the left moving spring 224. The two stationary contacts 211 on the right side of the push rod 23 form a group, corresponding to the two moving contacts 221 on the right moving spring 224. Since the two moving springs 224 can be separated by the push rod 23, and the distance between the moving contacts 221 on different moving springs 224 is relatively far, the possibility of arcing between different moving contacts 221 or between different stationary contacts 211 is between the two moving contacts 221 on the same side or between the two stationary contacts 211 on the same side.

[0044] See Figure 6 and Figure 7 To facilitate the installation of the arc-extinguishing magnetic component 3, in this embodiment, the housing 1 is provided with a first mounting groove 11 and a second mounting groove 12. The first mounting groove 11 is used to insert the arc-extinguishing magnetic component 3, and the second mounting groove 12 is used to insert the stationary contact 21. When the arc-extinguishing magnetic component 3 is first inserted into the first mounting groove 11 and the stationary contact 21 is subsequently inserted into the second mounting groove 12, the stationary contact 21 restricts and fixes the arc-extinguishing magnetic component 3 in the first mounting groove 11, thereby fixing the arc-extinguishing magnetic component 3 to prevent it from loosening. The overall structure is simple and easy to assemble.

[0045] Combined Figure 4 The stationary contact 21 is provided with a magnet slot 214, and the arc-extinguishing magnetic component 3 is embedded in the magnet slot 214. One of the first magnet 31 and the second magnet 32 ​​is provided with a notch 33, and the magnet slot 214 and the notch 33 are matched to prevent fooling. Specifically, the arc-extinguishing magnetic component 3 is inserted into the first mounting slot 11 along the X direction, and the stationary contact 21 is inserted into the second mounting slot 12 along the X direction. More specifically, the stationary contact 21 includes a stationary contact piece 212 and a stationary end foot 213, which are integrally connected. The stationary contact 211 and the magnet slot 214 are both provided on the stationary contact piece 212.

[0046] Since the arc-extinguishing magnetic component 3 mentioned above is provided in two sets, there are two magnetic slots 214 respectively located on opposite sides of the stationary contact piece 212. Correspondingly, there are also two first mounting slots 11 and two second mounting slots 12. During assembly, the two sides of the stationary contact piece 212 are respectively inserted into the two second mounting slots 12, thereby fixing the two sets of arc-extinguishing magnetic components 3 in the two first mounting slots 11.

[0047] The notch 33 is positioned on the magnet that is located on the outer side. In this embodiment, the first magnet 31 is positioned on the outer side, so the notch 33 is positioned on the first magnet 31. In this solution, the magnet slot 214 fits into the notch 33, which can prevent incorrect installation and also improve the positioning and limiting effect of the arc-extinguishing magnetic component 3.

[0048] See Figure 7 Preferably, the first mounting groove 11 and the second mounting groove 12 are partially connected, and the first mounting groove 11 and the second mounting groove 12 are arranged along the Y direction and partially offset in the Z direction. In this way, the arc-extinguishing magnetic component 3 can be better positioned and restricted, and the arc-extinguishing magnetic component 3 will not move into the second mounting groove 12. This allows the clamping arm that forms the magnet slot 214 on the stationary contact 21 to be made shorter, saving costs and making it less prone to breakage.

[0049] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A relay with arc extinguishing function, characterized in that, include: case; A contact assembly is disposed in the housing. The contact assembly includes a stationary contact and a moving contact. The stationary contact has at least two stationary contacts arranged along the X direction. The moving contact has a moving contact corresponding to each of the stationary contacts. An arc-extinguishing magnetic assembly is disposed on the housing. Along the Y direction, the arc-extinguishing magnetic assembly is located on one side of the stationary contact. The arc-extinguishing magnetic assembly includes a first magnet and a second magnet. The first magnet and the second magnet are arranged along the X direction and are respectively arranged corresponding to different stationary contacts. The first magnet and the second magnet have opposite magnetisms along the Y direction.

2. The relay with arc-extinguishing function according to claim 1, characterized in that, The housing is provided with a first mounting slot and a second mounting slot. The first mounting slot is used to insert the arc-extinguishing magnetic component, and the second mounting slot is used to insert the static contact. When the arc-extinguishing magnetic component is first inserted into the first mounting slot and the static contact is subsequently inserted into the second mounting slot, the static contact restricts and fixes the arc-extinguishing magnetic component in the first mounting slot.

3. The relay with arc-extinguishing function according to claim 2, characterized in that, The static contact is provided with a magnetic slot, the arc-extinguishing magnetic component is embedded in the magnetic slot, and one of the first magnet and the second magnet is provided with a notch. The magnetic slot and the notch fit together to prevent fooling.

4. The relay with arc-extinguishing function according to claim 3, characterized in that, The arc-extinguishing magnetic component is inserted into the first mounting slot along the X direction, and the static contact is inserted into the second mounting slot along the X direction.

5. The relay with arc-extinguishing function according to claim 4, characterized in that, The first mounting slot and the second mounting slot are partially connected, and the first mounting slot and the second mounting slot are arranged along the Y direction and partially offset in the Z direction.

6. The relay with arc-extinguishing function according to claim 3, characterized in that, The stationary contact includes a stationary contact piece and a stationary end foot, which are integrally connected. The stationary contact point and the magnet slot are both disposed on the stationary contact piece.

7. The relay with arc-extinguishing function according to claim 1, characterized in that, The first magnet and the second magnet are connected as a single unit.

8. The relay with arc-extinguishing function according to any one of claims 1 to 7, characterized in that, The contact assembly further includes a push rod, and the moving contact includes a moving contact piece, a moving end foot, and a moving spring. The moving contact piece and the moving end foot are integrally connected. One end of the moving spring is fixed to the moving contact piece, and the other end of the moving spring is connected to the push rod. Two moving contacts are arranged along the X direction on the moving spring.

9. The relay with arc-extinguishing function according to claim 8, characterized in that, Two movable springs are provided, arranged along the Y direction. One end of one movable spring is fixed to one end of the movable contact piece, and one end of the other movable spring is fixed to the other end of the movable contact piece. The other ends of the two movable springs are arranged close to each other and connected to the push rod. Four stationary contacts are provided, and the four stationary contacts are paired up to correspond to two movable contacts on different movable springs. Two sets of arc-extinguishing magnetic components are provided, arranged along the Y direction. Each set of arc-extinguishing magnetic components corresponds to two stationary contacts arranged in pairs, and the four stationary contacts along the Y direction are located between the two sets of arc-extinguishing magnetic components.

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