Quick-response direct-current relay

Abstract

The utility model discloses a quick-response direct-current relay, which comprises a magnetic circuit assembly, a moving contact mechanism and a static contact, and is characterized in that the magnetic circuit assembly is used for generating a magnetic field to drive the moving contact mechanism to move; the moving contact mechanism is used for abutting against and conducting the two static contacts. The two static contacts are used for being electrically connected with an external load; the magnetic circuit assembly comprises a movable iron core and an isolation cover, an isolation cavity is formed in the isolation cover, the movable iron core is arranged in the isolation cavity, and a communication path is formed in the isolation cavity to communicate spaces on the two sides of the moving direction of the movable iron core. In the utility model, in order to provide guidance for the movable iron core and prevent the movable iron core from deflecting, the distance between the side wall of the movable iron core and the inner side wall of the isolation cover is generally very small and is only 0.05 mm, and the spaces on the two sides of the movable iron core can be communicated through the communication path, so that the gas in the spaces on the two end surfaces in the movement process can quickly circulate and the gas pressure balance is ensured as soon as possible; and the movement of the movable iron core is not hindered, so that quick response is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a fast-response DC relay. Background Art

[0002] In current DC relays, the moving contact bridge generally needs to be kept integral with the driving 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 device. This function is achieved by driving the driving rod with the moving iron core.

[0003] In the current structure, the moving iron core is generally sealed in an isolation cover, and the fitting gap between the moving iron core and the inner wall of the isolation cover is often small. However, the moving iron core moves at a fast speed, which causes the gas in the isolation cover to not have time to be discharged through the gap between the moving iron core and the inner wall of the isolation cover during the movement of the moving iron core, thereby causing the gas to be compressed. At the same time, the compressed gas will cause the moving iron core to move poorly, which will cause the DC relay to have a long response time.

[0004] Therefore, a fast-response DC relay is urgently needed. Utility Model Content

[0005] The purpose of the utility model is to overcome the above technical deficiencies and provide a fast-response DC relay for solving the problem of unsmooth movement of the moving iron core in the prior art.

[0006] In order to achieve the above-mentioned technical objectives, the technical solution of the utility model is as follows: a fast-response DC relay, which includes a magnetic circuit component, a moving contact mechanism and a static contact, wherein: the magnetic circuit component is used to generate a magnetic field to drive the moving contact mechanism to move; the moving contact mechanism is used to resist and conduct two static contacts; the two static contacts are used to be electrically connected to an external load; the magnetic circuit component includes a moving iron core and an isolation cover, an isolation cavity is formed in the isolation cover, the moving iron core is arranged in the isolation cavity, and a connecting path is formed in the isolation cavity to connect the space on both sides of the moving direction of the moving iron core.

[0007] Preferably, a first connecting groove is provided on the outer side wall of the moving iron core, and two ends of the first connecting groove are respectively connected to the spaces on both sides of the moving direction of the moving iron core.

[0008] Preferably, a second connecting groove is provided on the inner side wall of the moving iron core, and two ends of the second connecting groove are respectively connected to the spaces on both sides of the moving direction of the moving iron core.

[0009] Preferably, the inner wall of the isolation cover is recessed outward to form a third connecting groove, and two ends of the third connecting groove are respectively connected to the spaces on both sides of the moving direction of the moving iron core.

[0010] Preferably, the moving contact mechanism includes a moving contact bridge, a driving shaft, a retaining frame, a first elastic member and a second elastic member, the retaining frame has a "mouth"-shaped retaining opening, the first elastic member and the moving contact bridge are arranged in the retaining opening, and the moving contact bridge is located on the side of the retaining opening close to the static contact, the first elastic member is in contact with the moving contact bridge, the side of the retaining frame away from the moving contact bridge is connected to the driving shaft, the side of the driving shaft away from the retaining frame is fixedly connected to the moving iron core, and the second elastic member is used to provide an elastic force for the driving shaft to move away from the static contact.

[0011] Preferably, the magnetic circuit assembly also includes a yoke plate, a coil unit and a magnetic conductive cylinder. The yoke plate forms a coil installation cavity with a conducting hole on one side. The coil unit is arranged in the coil installation cavity, and both end surfaces are respectively abutted against the inner side of the yoke plate. The coil unit has an installation cavity. The magnetic conductive cylinder is arranged in the installation cavity, and one end is connected to the side of the yoke plate away from the conducting hole, and the other end forms a gap with the side of the conducting hole of the yoke plate. The isolation cover is arranged in the installation cavity, and one side of the isolation cover is open, and the opening is connected to the conducting hole.

[0012] Preferably, the magnetic circuit assembly also includes a connecting tube, and one end is fixedly connected to the moving iron core. The connecting tube is sleeved on the drive shaft and arranged between the conducting hole side of the yoke iron plate and the moving iron core. The two ends of the second elastic member are respectively abutted against the connecting tube and the moving iron core.

[0013] Preferably, the fast-response DC relay also includes an arc-extinguishing hood, which is open on one side and fixedly connected to the conductive hole side of the yoke iron plate. The arc-extinguishing hood and the isolation hood are respectively arranged on both sides of the conductive hole. The static contact is arranged on the side of the arc-extinguishing hood away from the yoke iron plate, and the static contact passes through the arc-extinguishing hood and is fixedly connected to the arc-extinguishing hood.

[0014] Preferably, the fast-response DC relay also includes a shell, which includes a first shell and a second shell, the first shell and the second shell are snap-connected and enclosed in the yoke iron plate and the outside of the arc-extinguishing cover, the inner end face of the first shell abuts against the arc-extinguishing cover, and the inner end face of the second shell abuts against the yoke iron plate.

[0015] Preferably, the fast-response DC relay also includes an arc extinguishing assembly, which includes an arc extinguishing magnet and a fixing buckle. The arc extinguishing magnet is arranged on the outside of the arc extinguishing cover, and the two side surfaces of the fixing buckle are arranged between the arc extinguishing magnet and the first outer shell, and the two end surfaces of the fixing buckle are respectively abutted against the inner end surface of the first outer shell and the yoke iron plate.

[0016] Compared with the prior art, the beneficial effects of the utility model include: in order to provide guidance for the moving iron core and prevent the moving iron core from swinging, the distance between the side wall of the moving iron core and the inner wall of the isolation cover is generally very small, only 0.05mm, and through the connecting path, the space on both sides of the moving iron core can be connected, so that the gas in the space on both end surfaces during its movement can be quickly circulated to ensure the gas pressure balance as soon as possible, without causing obstruction to the movement of the moving iron core, thereby achieving rapid response. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an exploded view of a fast-response DC relay embodiment 1 provided by the utility model;

[0018] Figure 2 It is a stereogram of Embodiment 1 of the fast-response DC relay provided by the utility model;

[0019] Figure 3 It is a cutaway perspective view of a part of the structure of Embodiment 1 of a fast-response DC relay provided by the utility model;

[0020] Figure 4 It is a half-section view of a moving contact mechanism and a part of a magnetic circuit component of a fast-response DC relay embodiment 1 provided by the utility model;

[0021] Figure 5 It is a three-dimensional diagram of the moving iron core of the fast-response DC relay embodiment 1 provided by the utility model;

[0022] Figure 6 It is a three-dimensional diagram of the moving iron core of the fast-response DC relay embodiment 2 provided by the utility model;

[0023] Figure 7 It is a three-dimensional diagram of the moving iron core of the fast-response DC relay embodiment 3 provided by the utility model;

[0024] Figure markings: 1-magnetic circuit assembly, 2-moving contact mechanism, 3-static contact, 4-arc extinguishing cover, 5-housing, 6-arc extinguishing assembly, 11-moving iron core, 12-isolating cover, 13-yoke iron plate, 14-coil unit, 15-magnetic cylinder, 16-connecting cylinder, 21-moving contact bridge, 22-driving shaft, 23-retaining frame, 24-first elastic member, 25-second elastic member, 51-first outer shell, 52-second outer shell, 61-arc extinguishing magnet, 62-fixing buckle, 111-first connecting groove, 112-second connecting groove, 121-isolating cavity, 122-third connecting groove, 231-holding mouth. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] Embodiment 1:

[0027] See also Figure 1 and Figure 2This embodiment provides a fast-response DC relay, which includes a magnetic circuit component 1, a moving contact mechanism 2, a static contact 3, an arc extinguishing cover 4, a housing 5 and an arc extinguishing component 6, wherein:

[0028] See also Figure 3 and Figure 4 The magnetic circuit assembly 1 is used to generate a magnetic field to drive the moving contact mechanism 2 to move. Specifically, the magnetic circuit assembly 1 includes a moving iron core 11, an isolation cover 12, a yoke iron plate 13, a coil unit 14, a magnetic conductive cylinder 15 and a connecting cylinder 16. An isolation cavity 121 is formed in the isolation cover 12. The moving iron core 11 is disposed in the isolation cavity 121. A connecting path is formed in the isolation cavity 121. Please refer to Figure 5 , a first connecting groove 111 is provided on the outer wall of the moving iron core 11, and the two ends of the first connecting groove 111 are respectively connected to the space on both sides of the moving direction of the moving iron core 11. In this embodiment, the connecting path is formed by the first connecting groove 111, and the first connecting groove 111 is provided on the outer wall of the moving iron core 11, and the two ends of the first connecting groove 111 are respectively connected to the space on both sides of the moving direction of the moving iron core 11. The yoke iron plate 13 forms a coil installation cavity, and a conductive hole is provided on one side. The coil unit 14 is arranged in the coil installation cavity, and the two end surfaces are respectively abutted against the inner side of the yoke iron plate 13. The coil unit 14 has an installation cavity, and the magnetic conductive cylinder 15 is arranged in the installation cavity, and one end is abutted against the side of the yoke iron plate 13 away from the conductive hole, and the other end forms a gap with the conductive hole side of the yoke iron plate 13. The isolation cover 12 is arranged in the installation cavity, and one side of the isolation cover 12 is open, and the open side is connected to the conductive hole. The driving shaft 22 passes through the conducting hole and one end is fixedly connected to the moving iron core 11. The connecting tube 16 is sleeved on the driving shaft 22 and is arranged between the conducting hole side of the yoke iron plate 13 and the moving iron core 11. The two ends of the second elastic member 25 are respectively in contact with the connecting tube 16 and the moving iron core 11.

[0029] The moving contact mechanism 2 is used to abut and conduct the two stationary contacts 3. Specifically, the moving contact mechanism 2 includes a moving contact bridge 21, a drive shaft 22, a retaining frame 23, a first elastic member 24 and a second elastic member 25. The retaining frame 23 has a "mouth"-shaped retaining opening 231. The first elastic member 24 and the moving contact bridge 21 are arranged in the retaining opening 231, and the moving contact bridge 21 is located in the retaining opening 231 on the side close to the stationary contact 3. The first elastic member 24 abuts against the moving contact bridge 21. The side of the retaining frame 23 away from the moving contact bridge 21 is connected to the drive shaft 22. The side of the drive shaft 22 away from the retaining frame 23 is fixedly connected to the moving iron core 11. The second elastic member 25 is used to provide an elastic force for the drive shaft 22 to move away from the stationary contact 3. Generally speaking, the first elastic member 24 and the second elastic member 25 are both springs, so the second elastic member 25 is sleeved on the drive shaft 22.

[0030] The arc extinguishing hood 4 is open on one side, and the open side is fixedly connected to the conducting hole side of the yoke iron plate 13, and the arc extinguishing hood 4 and the isolating hood 12 are respectively arranged on both sides of the conducting hole. The interior of the arc extinguishing hood 4 is closed by one side of the yoke iron plate 13 and the isolating hood 12 to form a sealed cavity, which is vacuum or filled with arc extinguishing gas to extinguish the arc faster. The static contact 3 is arranged on the side of the arc extinguishing hood 4 away from the yoke iron plate 13, and the static contact 3 passes through the arc extinguishing hood 4 and is fixedly connected to the arc extinguishing hood 4. The two static contacts 3 are used to be electrically connected to an external load.

[0031] The shell 5 includes a first shell 51 and a second shell 52. The first shell 51 and the second shell 52 are snap-connected and enclose the yoke iron plate 13 and the outside of the arc-extinguishing cover 4. The inner end surface of the first shell 51 abuts against the arc-extinguishing cover 4, and the inner end surface of the second shell 52 abuts against the yoke iron plate 13.

[0032] The arc extinguishing assembly 6 includes an arc extinguishing magnet 61 and a fixing buckle 62. The arc extinguishing magnet 61 is a permanent magnet. The magnetic field generated can lengthen the arc and extinguish the arc faster. The arc extinguishing magnet 61 is arranged on the outside of the arc extinguishing cover 4. The two side surfaces of the fixing buckle 62 are arranged between the arc extinguishing magnet 61 and the first shell 51. The two end surfaces of the fixing buckle 62 are respectively abutted against the inner end surface of the first shell 51 and the yoke iron plate 13.

[0033] Embodiment 2:

[0034] See also Figure 6 The implementation method of Example 2 is basically the same as that of Example 1, and will not be described in detail here. The difference is that:

[0035] The moving iron core 11 does not have the first connecting groove 111 structure, and its connecting path is the second connecting groove 112. The second connecting groove 112 is opened on the inner wall of the moving iron core 11, and the two ends of the second connecting groove 112 are respectively connected to the space on both sides of the moving direction of the moving iron core 11.

[0036] Embodiment 3:

[0037] See also Figure 7 The implementation method of Example 3 is basically the same as that of Example 1, and will not be repeated here. The difference is that:

[0038] The moving iron core 11 does not have the first connecting groove 111 structure, and its connecting path is the third connecting groove 122. The inner wall of the isolation cover 12 is recessed outward to form the third connecting groove 122. The two ends of the second connecting groove 112 are respectively connected to the space on both sides of the moving direction of the moving iron core 11.

[0039] The following is a brief description of the working principle of a fast-response DC relay provided by the utility model: in order to provide guidance for the moving iron core and prevent the moving iron core from swinging, the distance between the side wall of the moving iron core and the inner wall of the isolation cover is generally very small, only 0.05mm, and through this connecting path, the space on both sides of the moving iron core can be connected, so that the gas in the space on both end surfaces during its movement can be quickly circulated to ensure the gas pressure balance as soon as possible, without causing any obstruction to the movement of the moving iron core, thereby achieving a fast response.

[0040] The above specific implementation methods of the utility model do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A fast-response DC relay, characterized in that: It includes a magnetic circuit component, a moving contact mechanism, and a static contact, where: The magnetic circuit component is used to generate a magnetic field to drive the movement of the moving contact mechanism; The moving contact mechanism is used to abut and conduct the two static contacts; The two static contacts are used for electrical connection with an external load; The magnetic circuit component includes a moving iron core and an isolation cover. An isolation cavity is formed inside the isolation cover. The moving iron core is arranged in the isolation cavity. A communication path is formed in the isolation cavity to communicate the spaces on both sides of the moving direction of the moving iron core.

2. A fast-response DC relay according to claim 1, characterized in that: A first connection groove is formed on the outer side wall of the moving iron core. Both ends of the first connection groove communicate with the spaces on both sides of the moving direction of the moving iron core respectively.

3. A fast-response DC relay according to claim 1, characterized in that: A second connection groove is formed on the inner side wall of the moving iron core. Both ends of the second connection groove communicate with the spaces on both sides of the moving direction of the moving iron core respectively.

4. A fast-response DC relay according to claim 1, characterized in that: The inner wall of the isolation cover is recessed outward to form a third connection groove. Both ends of the third connection groove communicate with the spaces on both sides of the moving direction of the moving iron core respectively.

5. A fast-response DC relay according to claim 1, characterized in that: The moving contact mechanism includes a moving contact bridge, a driving shaft, a cage, a first elastic member, and a second elastic member. The cage has a "mouth"-shaped holding opening. The first elastic member and the moving contact bridge are arranged in the holding opening, and the moving contact bridge is located on the side of the holding opening close to the static contact. The first elastic member abuts against the moving contact bridge. The side of the cage away from the moving contact bridge is connected to the driving shaft. The side of the driving shaft away from the cage is fixedly connected to the moving iron core. The second elastic member is used to provide an elastic force for the driving shaft to move away from the static contact.

6. A fast-response DC relay according to claim 5, characterized in that: The magnetic circuit component further includes a yoke iron plate, a coil unit, and a magnetic conduction cylinder. The yoke iron plate forms a coil installation cavity, and a guide through hole is opened on one side. The coil unit is arranged in the coil installation cavity, and both end faces are respectively abutted against the inner side of the yoke iron plate. The coil unit is provided with an installation cavity. The magnetic conduction cylinder is arranged in the installation cavity, and one end is connected to the side of the yoke iron plate away from the guide through hole, and a gap is formed between the other end and the side of the yoke iron plate with the guide through hole. The isolation cover is arranged in the installation cavity. One side of the isolation cover is open, and the opening communicates with the guide through hole.

7. A fast-response DC relay according to claim 6, characterized in that: The magnetic circuit component further includes a connecting cylinder, and one end is fixedly connected to the moving iron core. The connecting cylinder is sleeved on the driving shaft and is arranged between the side of the yoke iron plate with the guide through hole and the moving iron core. Both ends of the second elastic member are respectively abutted against the connecting cylinder and the moving iron core.

8. A fast-response DC relay according to claim 6, characterized in that: The fast-response DC relay further includes an arc extinguishing cover. The arc extinguishing cover is open on one side, and the open side is fixedly connected to the side of the yoke iron plate with the guide through hole. The arc extinguishing cover and the isolation cover are respectively arranged on both sides of the guide through hole. The static contact is arranged on the side of the arc extinguishing cover away from the yoke iron plate, and the static contact penetrates through the arc extinguishing cover and is fixedly connected to the arc extinguishing cover.

9. A fast-response DC relay according to claim 8, characterized in that: The fast-response DC relay further includes a housing. The housing includes a first outer shell and a second outer shell. The first outer shell and the second outer shell are snap-connected and surround the outside of the yoke iron plate and the arc extinguishing cover. The inner end face of the first outer shell abuts against the arc extinguishing cover, and the inner end face of the second outer shell abuts against the yoke iron plate.

10. A fast-response DC relay according to claim 9, characterized in that: The fast-response DC relay also includes an arc extinguishing component, which includes an arc extinguishing magnet and a fixing buckle. The arc extinguishing magnet is arranged on the outside of the arc extinguishing cover, and the two side surfaces of the fixing buckle are arranged between the arc extinguishing magnet and the first shell. The two end surfaces of the fixing buckle are respectively abutted against the inner end surface of the first shell and the yoke iron plate.

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