High-voltage direct-current relay capable of monitoring state of main contact

Abstract

The utility model discloses a high-voltage direct current relay capable of monitoring the state of a main contact, which comprises a shell, a magnetic circuit assembly, a moving contact mechanism, static contacts and an induction piece, and is characterized in that the moving contact mechanism is arranged in a mounting cavity and is used for connecting and conducting the two static contacts, and the moving contact mechanism is provided with a contact end and an induction end which are oppositely arranged; the contact end and the sensing end are relatively fixed, and when the magnetic circuit assembly is electrified, the movable contact mechanism is driven to move, and the two static contacts are connected and conducted at the contact end; the induction part is fixedly arranged in the mounting cavity, is close to the induction end and is used for indicating the position of the movable contact mechanism, when the induction end is located within the induction limit position, the induction part indicates a first state, and when the induction end is located outside the induction limit position, the induction part indicates a second state. According to the utility model, the induction piece is used for sensing that the position of the induction end is within or out of an induction limit range to monitor the state of the main contact, and the induction end is positioned on one side of the movable contact mechanism far away from the static contact, thereby avoiding the magnetic field influence of the magnetic circuit assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a high-voltage direct current relay capable of monitoring the state of a main contact. Background Art

[0002] At present, the DC relays used in charging piles and energy storage equipment have main contacts including static contacts and moving contact bridges, which are often connected to high-current circuits. In actual working processes, the breaking current is often relatively large, which will cause greater damage to the moving contact bridge and static contacts, and may even cause the main contacts to stick together, thereby causing the DC relay to fail. Therefore, the function of detecting the status of the main contacts is very necessary.

[0003] There are two common practices. The first is to add an auxiliary contact structure inside the arc extinguishing chamber. This type of structure will occupy the limited space inside the arc extinguishing chamber. At the same time, the auxiliary contact is easily contaminated by impurities inside the arc extinguishing chamber, and its reliability is difficult to guarantee. The second is to use a magnetic sensitive switch such as a reed switch, which can be installed in the external area of ​​the relay to confirm the position of the main contact by detecting the position of the moving iron core. The reed switch of this structure is generally located at the bottom of the moving iron core near the electromagnetic coil area. It will be interfered by the magnetic field of the electromagnetic coil itself and cannot determine the position of the moving iron core, thereby failing to correctly confirm the state of the main contact. Utility Model Content

[0004] The utility model aims to overcome the above technical deficiencies and provide a high-voltage DC relay capable of monitoring the state of main contacts, so as to solve the problem in the prior art that the DC relay senses the position of the moving iron core through a magnetic sensitive switch and is easily disturbed by the electromagnetic coil.

[0005] In order to achieve the above technical objectives, the technical solution of the utility model is as follows: a high-voltage DC relay capable of monitoring the state of a main contact, comprising a shell, a magnetic circuit assembly, a moving contact mechanism, a static contact and a sensing member, wherein: a mounting cavity is formed in the shell; one side of two static contacts is fixed in the mounting cavity; the magnetic circuit assembly is arranged in the mounting cavity and is used to drive the moving contact mechanism; the moving contact mechanism is arranged in the mounting cavity and is used to connect and conduct the two static contacts, the moving contact mechanism has two oppositely arranged contact ends and a sensing end, when the magnetic circuit assembly is energized, the moving contact mechanism is driven to move, and the two static contacts are connected and conducted at the contact end, the sensing end is located on the side of the moving contact mechanism away from the static contact; the sensing member is fixedly arranged in the mounting cavity and close to the sensing end, and is used to indicate the position of the moving contact mechanism, the sensing member has a sensing limit position, when the sensing end is located within the sensing limit position, the sensing member indicates a first state, when the sensing end is located outside the sensing limit position, the sensing member indicates a second state.

[0006] Preferably, the moving contact mechanism includes a moving contact bridge, a drive shaft, a retaining frame, a moving iron core, 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 drive shaft, the side of the drive 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 drive shaft to move away from the static contact.

[0007] Preferably, the dynamic contact mechanism also includes a permanent magnet, a carrier and a third elastic member. The carrier is arranged at one end of the moving iron core away from the driving shaft. The permanent magnet is fixedly connected to the carrier. The third elastic member contacts the carrier and presses it against one side of the moving iron core, thereby causing the carrier to move with the moving iron core.

[0008] Preferably, the sensing element is a reed switch.

[0009] Preferably, the magnetic circuit assembly includes a partition, a coil, a magnetic cylinder, and a connecting frame. The connecting frame is in a "U" shape and is connected to the partition at both ends. The two ends of the coil are respectively in contact with the partition and the connecting frame. A driving cavity is formed in the coil. The magnetic cylinder is arranged in the driving cavity. One end of the magnetic cylinder is connected to the connecting frame, and the other end forms a gap with the partition. Preferably, the magnetic circuit assembly also includes an isolation cover. The isolation cover is open on one side, and the open side is fixedly connected to the partition. The moving iron core, the permanent magnet, the carrier and the third elastic member are all arranged in the isolation cover. The two ends of the third elastic member are respectively in contact with the carrier and the isolation cover away from the open side.

[0010] Preferably, the magnetic circuit assembly also includes a connecting tube, which is arranged in the isolation cover and one end is connected to the partition, the connecting tube has a driving hole, the driving shaft is arranged in the driving hole, and the two ends of the second elastic member are respectively abutted against the connecting tube and the moving iron core.

[0011] Preferably, the high-voltage DC relay capable of monitoring the status of the main contacts also includes an arc extinguishing hood, which is open on one side and is closed by a partition on the side close to the static contact. A closed arc extinguishing cavity is formed in the arc extinguishing hood, the moving contact bridge is arranged in the arc extinguishing cavity, and the static contact passes through the inside and outside of the arc extinguishing hood and is fixedly connected to the arc extinguishing hood.

[0012] Preferably, the high-voltage DC relay capable of monitoring the status of the main contacts further comprises an arc extinguishing magnet and a fixing buckle, wherein the fixing buckle is in a "C" shape, and the two fixing buckles are arranged around the outside of the arc extinguishing cover, and the two arc extinguishing magnets are arranged on the outside of the arc extinguishing cover and are respectively fixed by the two fixing buckles.

[0013] Preferably, the shell includes a first shell and a second shell, which are snap-connected and enclose a mounting cavity, the two ends of the fixing buckle respectively abut against the inner end surface of the first shell and the arc-extinguishing cover, the side of the connecting frame away from the partition abuts against the inner end surface of the second shell, and the induction component is arranged between the second shell and the connecting frame.

[0014] Compared with the prior art, the beneficial effects of the utility model include: using an induction component to sense whether the position of the induction end is within or outside the induction limit range to monitor the state of the main contact, and the induction end is located on the side of the magnetic circuit component away from the static contact to avoid the influence of the magnetic field of the magnetic circuit component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an exploded view of a high voltage DC relay capable of monitoring the state of main contacts provided by the utility model;

[0016] Figure 2 It is a three-dimensional diagram of a high-voltage DC relay capable of monitoring the state of main contacts provided by the utility model;

[0017] Figure 3 It is a top view of a high voltage DC relay capable of monitoring the state of main contacts provided by the utility model;

[0018] Figure 4 The utility model provides a high-voltage DC relay capable of monitoring the state of the main contacts. Figure 3 A three-dimensional view cut at center A;

[0019] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0020] Figure 6 A three-dimensional diagram of a moving contact mechanism of a high-voltage DC relay capable of monitoring the state of a main contact provided by the utility model;

[0021] Figure 7 An exploded view of a moving contact mechanism of a high voltage DC relay capable of monitoring the state of a main contact provided by the utility model;

[0022] Figure markings: 1-shell, 2-magnetic circuit assembly, 3-moving contact mechanism, 4-static contact, 5-induction member, 6-arc extinguishing cover, 7-arc extinguishing magnet, 8-fixing buckle, 11-installation cavity, 12-first shell, 13-second shell, 21-partition, 22-coil, 23-magnetic cylinder, 24-connecting frame, 25-isolating cover, 26-connecting cylinder, 3a-contact end, 3b-induction end, 31-moving contact bridge, 32-driving shaft, 33-retaining frame, 34-moving iron core, 35-first elastic member, 36-second elastic member, 37-permanent magnet, 38-carrier, 39-third elastic member, 61-arc extinguishing cavity, 221-driving cavity, 261-driving hole, 331-retaining mouth. DETAILED DESCRIPTION

[0023] 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.

[0024] See also Figure 1 and Figure 2 This embodiment provides a high-voltage DC relay capable of monitoring the state of a main contact, which includes a housing 1, a magnetic circuit assembly 2, a moving contact mechanism 3, a stationary contact 4, and an induction member 5, wherein:

[0025] An installation cavity 11 is formed in the housing 1. Specifically, the housing 1 includes a first shell 12 and a second shell 13, and the first shell 12 and the second shell 13 are snap-connected and enclosed to form the installation cavity 11.

[0026] One side of the two stationary contacts 4 is fixed in the mounting cavity 11 , and the other side extends out of the housing 1 . The stationary contacts 4 are used to connect the system circuit.

[0027] See also Figure 3 and Figure 4 , the magnetic circuit assembly 2 is arranged in the installation cavity 11, and is used to drive the dynamic contact mechanism 3. Specifically, the magnetic circuit assembly 2 includes a partition 21, a coil 22, a magnetic tube 23, and a connecting frame 24. The connecting frame 24 is in a "U" shape, and its two ends are connected to the partition 21. The two ends of the coil 22 are respectively in contact with the partition 21 and the connecting frame 24. A driving cavity 221 is formed in the coil 22. The magnetic tube 23 is arranged in the driving cavity 221, and one end of the magnetic tube 23 is connected to the connecting frame 24, and the other end forms a gap with the partition 21. The moving iron core 34 is arranged in the gap. When the coil 22 is energized, a magnetic field is generated, which drives the moving iron core 34 to move in the direction of the closed gap.

[0028] See also Figure 1 , Figure 6 as well as Figure 7The moving contact mechanism 3 is arranged in the installation cavity 11 and is used to connect and conduct the two static contacts 4. The moving contact mechanism 3 has two oppositely arranged contact ends 3a and induction ends 3b. When the magnetic circuit assembly 2 is energized, the moving contact mechanism 3 is driven to move and connect and conduct the two static contacts 4 at the contact ends 3a. Specifically, the moving contact mechanism 3 includes a moving contact bridge 31, a drive shaft 32, a retaining frame 33, a moving iron core 34, a first elastic member 35 and a second elastic member 36. The retaining frame 33 has a "mouth"-shaped retaining opening 331. The first elastic member 35 and the moving contact bridge 31 are arranged in the retaining opening 331, and the moving contact bridge 31 is located on the side of the retaining opening 331 close to the static contact 4. The first elastic member 35 contacts the moving contact bridge 31. The side of the retaining frame 33 away from the moving contact bridge 31 is connected to the drive shaft 32. The side of the drive shaft 32 away from the retaining frame 33 is fixedly connected to the moving iron core 34. The second elastic member 36 is used to provide an elastic force for the drive shaft 32 to move away from the static contact 4. When the coil 22 is energized, a magnetic field is generated to drive the moving iron core 34 to move, and at the same time, the driving shaft 32 and the retaining frame 33 are driven to move toward the static contact 4. When the moving contact bridge 31 contacts the two static contacts 4, the static contact 4 is turned on, but the driving shaft 32 will move a certain distance. At this time, the first elastic member 35 is compressed, and a certain pressure is applied to the moving contact bridge 31 to ensure that the moving contact bridge 31 and the static contact 4 are firmly connected. When the coil 22 loses power, the moving iron core 34 and the driving shaft 32 are reset under the action of the second elastic member 36, driving the retaining frame 33 to move in a direction away from the static contact 4, so that the moving contact bridge 31 and the static contact 4 are separated.

[0029] As a preferred embodiment, the high-voltage DC relay capable of monitoring the state of the main contact further comprises an arc extinguishing hood 6, which is open on one side and is closed by a side of the partition 21 close to the static contact 4, and a closed arc extinguishing cavity 61 is formed in the arc extinguishing hood 6, the moving contact bridge 31 is arranged in the arc extinguishing cavity 61, and the static contact 4 passes through the inside and outside of the arc extinguishing hood 6 and is fixedly connected to the arc extinguishing hood 6. The arc extinguishing cavity 61 is generally filled with arc extinguishing gas such as nitrogen to promote arc extinguishing and reduce the damage of the arc to the static contact 4.

[0030] Furthermore, the high-voltage DC relay capable of monitoring the state of the main contact further comprises an arc extinguishing magnet 7 and a fixing buckle 8, the fixing buckle 8 is in a "C" shape, and the two fixing buckles 8 are arranged around the outside of the arc extinguishing cover 6, and the two arc extinguishing magnets 7 are arranged outside the arc extinguishing cover 6 and are respectively fixed by the two fixing buckles 8. The two ends of the fixing buckle 8 are respectively in contact with the inner end surface of the first housing 12 and the arc extinguishing cover 6, the side of the connecting frame 24 away from the partition 21 is in contact with the inner end surface of the second housing 13, and the induction member 5 is arranged between the second housing 13 and the connecting frame 24. The arc is elongated by the arc extinguishing magnet 7, so that the arc is extinguished faster.

[0031] The sensing element 5 is fixedly arranged in the mounting cavity 11 and close to the sensing end 3b, and is used to indicate the position of the dynamic contact mechanism 3. The sensing element 5 has a sensing limit position. When the sensing end 3b is located within the sensing limit position, the sensing element 5 indicates a first state. When the sensing end 3b is located outside the sensing limit position, the sensing element 5 indicates a second state. The sensing element 5 may be a proximity switch, etc., which senses the position of the moving iron core 34 or the drive shaft 32 through the proximity switch to determine the state of the main contact. Preferably, the sensing element 5 in this embodiment is a reed switch, and the moving contact mechanism 3 also includes a permanent magnet 37, a carrier 38 and a third elastic member 39. The carrier 38 is arranged at one end of the moving iron core 34 away from the drive shaft 32. The permanent magnet 37 is fixedly connected to the carrier 38. The third elastic member 39 is connected to the carrier 38 and enables the carrier 38 to move with the moving iron core 34. Due to the action of the third elastic member 39, the carrier 38 and the permanent magnet 37 always move with the moving iron core 34. When the drive shaft 32 and the moving iron core 34 start to move toward the static contact 4, the carrier 38 and the permanent magnet 37 move toward the static contact 4. The permanent magnet 37 moves with the movement, so the permanent magnet 37 moves away from the reed switch. When the permanent magnet 37 moves beyond the inductive limit position of the reed switch, the state of the reed switch changes. When the drive shaft 32 and the moving iron core 34 move away from the static contact 4, the carrier 38 and the permanent magnet 37 move with the movement, and the permanent magnet 37 moves close to the reed switch. When the permanent magnet 37 moves within the inductive limit position of the reed switch, the state of the reed switch changes. In this embodiment, the inductive limit position can be adjusted according to the position of the reed switch, the magnetic field strength of the permanent magnet 37, the inductive sensitivity of the reed switch, etc. The first state and the second state are indicated by the output signal of the reed switch, and the output of the reed switch as an open or closed signal in the first state and the second state can be selected according to the requirements of the control circuit.

[0032] See also Figure 5 As a preferred embodiment, the magnetic circuit assembly 2 further comprises an isolation cover 25, which is open on one side and fixedly connected to the partition 21. The moving iron core 34, the permanent magnet 37, the carrier 38 and the third elastic member 39 are all arranged in the isolation cover 25, and the two ends of the third elastic member 39 are respectively in contact with the carrier 38 and the isolation cover 25 away from the opening. The first elastic member 35, the second elastic member 36 and the third elastic member 39 of the assembly of this embodiment are all springs, which are convenient for installation.

[0033] On the one hand, the isolation cover 25 can close the opening of the partition 21, thereby closing the arc extinguishing cavity 61 to ensure that the arc extinguishing cavity 61 is airtight, and on the other hand, it also restricts the carrier 38 and the moving iron core 34 therein.

[0034] Furthermore, the magnetic circuit assembly 2 also includes a connecting tube 26, which is arranged in the isolation cover 25 and one end is connected to the partition 21. The connecting tube 26 opens a driving hole 261, and the driving shaft 32 is arranged in the driving hole 261. The two ends of the second elastic member 36 are respectively abutted against the connecting tube 26 and the moving iron core 34.

[0035] The driving hole 261 can well limit the driving shaft 32 to ensure that the driving shaft 32 moves smoothly. The second elastic member 36 serves as a power source for resetting the moving iron core 34, and its elastic force is stronger than the third elastic member 39 that serves as a support base 38 to follow the movement of the moving iron core 34.

[0036] The working principle of a high-voltage DC relay capable of monitoring the state of the main contacts provided by the utility model is briefly described below: the third elastic member 39 causes the carrier 38 and the permanent magnet 37 to move with the moving contact mechanism 3, and the permanent magnet 37 is sensed by the sensing member 5. When the moving contact mechanism 3 moves and the permanent magnet 37 moves from the inductive limit position to the inductive limit position, the sensing member 5 switches from the first state to the second state, and vice versa, it switches from the second state to the first state. By adjusting the inductive limit position, the position of the moving contact bridge 31 can be indicated. If the inductive limit position is the position of the permanent magnet 37 when the coil 22 is powered off, then the sensing member 5 can be used to determine whether the moving iron core 34 or the moving contact bridge 31 starts to start or resets to the original position. If the inductive limit position is the position of the permanent magnet 37 when the moving contact bridge 31 is attracted to the static contact 4, then the sensing member 5 can be used to determine whether the moving contact bridge 31 or the moving iron core 34 starts to reset or whether the moving contact bridge 31 is normally attracted to the static contact 4, thereby achieving the purpose of monitoring the state of the main contacts. In addition, the second elastic member 36 and the third elastic member 39 are respectively applied on both sides of the moving iron core 34, so that the moving iron core 34 is not easy to deflect, and the wear caused by deflection is reduced. In the structure where the permanent magnet 37 is directly fixed to the moving contact mechanism 3, in order to prevent the moving iron core 34 or the permanent magnet 37 from hitting the bottom, there is usually a certain gap between the moving iron core 34 or the permanent magnet 37 and the bottom of the isolation cover 25. In the present utility model, due to the buffering effect of the third elastic member 39, the gap between the permanent magnet 37 and the bottom of the isolation cover 25 can be appropriately reduced, and the permanent magnet 37 can be closer to the induction member 5, which is convenient for controlling and adjusting the induction member 5.

[0037] To summarize, the utility model provides a high-voltage DC relay capable of monitoring the state of the main contacts. The induction element is used to sense whether the position of the induction end is within or outside the induction limit range to monitor the state of the main contacts. The induction end is located on the side of the magnetic circuit component away from the static contact to avoid the influence of the magnetic field of the magnetic circuit component.

[0038] 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 high voltage DC relay capable of monitoring the state of a main contact, characterized in that: It includes a housing, a magnetic circuit assembly, a moving contact mechanism, a stationary contact, and an inductor, where: An installation cavity is formed inside the housing; One side of the two stationary contacts is fixed inside the installation cavity; The magnetic circuit assembly is arranged inside the installation cavity and is used to drive the moving contact mechanism; The moving contact mechanism is arranged inside the installation cavity and is used to connect and conduct the two stationary contacts. The moving contact mechanism has two relatively arranged contact ends and an induction end. When the magnetic circuit assembly is powered on, it drives the moving contact mechanism to move, and connects and conducts the two stationary contacts at the contact ends. The induction end is located on the side of the moving contact mechanism away from the stationary contacts; The inductor is fixedly arranged inside the installation cavity and close to the induction end, and is used to indicate the position of the moving contact mechanism. The inductor has an induction limit position. When the induction end is within the induction limit position, the inductor indicates the first state. When the induction end is outside the induction limit position, the inductor indicates the second state.

2. A high voltage DC relay capable of monitoring the state of main contacts according to claim 1, characterized in that: The moving contact mechanism includes a moving contact bridge, a drive shaft, a retainer, a moving iron core, a first elastic member, and a second elastic member. The retainer has a "mouth"-shaped retaining opening. The first elastic member and the moving contact bridge are arranged inside the retaining opening, and the moving contact bridge is located on the side of the retaining opening close to the stationary contact. The first elastic member abuts against the moving contact bridge. The side of the retainer away from the moving contact bridge is connected to the drive shaft. The side of the drive shaft away from the retainer is fixedly connected to the moving iron core. The second elastic member is used to provide an elastic force for the drive shaft to move away from the stationary contact.

3. A high voltage DC relay capable of monitoring the state of main contacts according to claim 2, characterized in that: The moving contact mechanism further includes a permanent magnet, a carrier seat, and a third elastic member. The carrier seat is arranged at one end of the moving iron core away from the drive shaft. The permanent magnet is fixedly connected to the carrier seat. The third elastic member abuts against the carrier seat and presses it against one side of the moving iron core, so that the carrier seat moves with the moving iron core.

4. A high voltage DC relay capable of monitoring the state of main contacts according to claim 3, characterized in that: The inductor is a reed switch.

5. A high voltage DC relay capable of monitoring the state of main contacts according to claim 3, characterized in that , The magnetic circuit assembly includes a partition plate, a coil, a magnetic conduction cylinder, and a connecting frame. The connecting frame is in a "U" shape and its two ends are connected to the partition plate. The two ends of the coil are respectively in contact with the partition plate and the connecting frame. A drive cavity is formed inside the coil. The magnetic conduction cylinder is arranged inside the drive cavity, and one end of the magnetic conduction cylinder is connected to the connecting frame, and a gap is formed between the other end and the partition plate.

6. A high voltage DC relay capable of monitoring the state of main contacts according to claim 5, characterized in that: The magnetic circuit assembly further includes an isolation cover. The isolation cover has a single-side opening, and the opening side is fixedly connected to the partition plate. The moving iron core, the permanent magnet, the carrier seat, and the third elastic member are all arranged inside the isolation cover. The two ends of the third elastic member are respectively in contact with the carrier seat and the side of the isolation cover away from the opening.

7. A high voltage DC relay capable of monitoring the state of main contacts according to claim 6, characterized in that: The magnetic circuit assembly further includes a connecting cylinder. The connecting cylinder is arranged inside the isolation cover and one end is connected to the partition plate. The connecting cylinder is provided with a drive hole. The drive shaft is arranged inside the drive hole. The two ends of the second elastic member are respectively in contact with the connecting cylinder and the moving iron core.

8. A high voltage DC relay capable of monitoring the state of main contacts according to claim 5, characterized in that: The high-voltage DC relay capable of monitoring the state of the main contacts further comprises an arc extinguishing hood, which is open on one side and is closed by the side of the partition close to the static contact, a closed arc extinguishing cavity is formed in the arc extinguishing hood, the moving contact bridge is arranged in the arc extinguishing cavity, and the static contact passes through the inside and outside of the arc extinguishing hood and is fixedly connected to the arc extinguishing hood.

9. A high voltage DC relay capable of monitoring the state of main contacts according to claim 8, characterized in that: The high-voltage DC relay capable of monitoring the state of the main contacts also includes an arc-extinguishing magnet and a fixing buckle, wherein the fixing buckle is in a "C" shape, and the two fixing buckles are arranged around the outside of the arc-extinguishing cover, and the two arc-extinguishing magnets are arranged on the outside of the arc-extinguishing cover and are respectively fixed by the two fixing buckles.

10. A high voltage DC relay capable of monitoring the state of main contacts according to claim 9, characterized in that: The shell includes a first shell and a second shell, the first shell and the second shell are snap-connected and enclose the installation cavity, the two ends of the fixing buckle are respectively abutted against the inner end surface of the first shell and the arc-extinguishing cover, the side of the connecting frame away from the partition is abutted against the inner end surface of the second shell, and the induction component is arranged between the second shell and the connecting frame.

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