High-voltage contact protection relay for mining frequency converters

Abstract

This invention provides a high-voltage contact protection relay for mining frequency converters, relating to the field of relay structure technology. It includes a fixed electrode, a movable electrode, and an electromagnet core. An elastic support structure is provided between the fixed and movable electrodes, and they are separated under the action of the elastic support structure. The electromagnet core is used to push the movable electrode to apply a thrust, causing the movable electrode to overcome the elastic force of the elastic support structure and slide into contact with the fixed electrode. The invention is characterized by: a first mounting hole being formed on the end face of the movable electrode facing the fixed electrode; a first contact and a support spring being disposed within the first mounting hole; and the bottom end of the support spring abutting against the upper end of the first contact. This invention, by changing the arc formation position, can effectively prevent the formation of an arc at the contact surface between the fixed and movable electrodes, thus protecting the contact between the fixed and movable electrodes, reducing poor contact caused by ablation, and improving the stability and reliability of the relay.

Description

Technical Field

[0001] This invention relates to the field of relay structure technology, and in particular to a high-voltage contact protection relay for mining frequency converters. Background Technology

[0002] Mining frequency converters, also known as explosion-proof frequency converters, are mainly used for soft start and soft stop control of high-load equipment in places with explosion hazards such as underground coal mines, open-pit mines, coal preparation plants, chemical plants, and pulverizing plants. They have rated voltage levels of 660 to 1140V and rated power of 5.5 to 630kW.

[0003] Relays, as an important electrical control device in electrical systems, are indispensable in this dynamic environment monitoring system.

[0004] In existing relays, the operation of the system is controlled by using an electromagnetic coil. The armature contacts different electrodes to achieve circuit control of the system. In order to achieve the reset action of the armature, it is often arranged in a lever structure. When the two electrodes are connected, an electric arc is generated. This causes the contact surface of the two electrodes to be burned by the electric arc during high-frequency switching. It is also very easy to cause poor contact, resulting in poor stability and reliability. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a high-voltage contact protection relay for mining frequency converters, which can effectively prevent the formation of electric arcs at the contact surfaces of fixed and moving electrodes, thereby protecting the contact between the fixed and moving electrodes, reducing poor contact caused by ablation, and improving its stability and reliability.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A high-voltage contact protection relay for a mining frequency converter includes a fixed electrode, a movable electrode, and an electromagnet core.

[0008] An elastic support structure is provided between the fixed electrode and the movable electrode, and the two electrodes are separated under the action of the elastic support structure. The electromagnet core is used to push the movable electrode to apply a thrust, so that the movable electrode overcomes the elastic force of the elastic support structure and slides to contact the fixed electrode.

[0009] The electromagnet core has a third mounting hole that runs through the length direction. The third mounting hole serves as the mounting space for the fixed electrode and the movable electrode, as well as as a sliding support structure for the movable electrode. The fixed electrode is fixedly installed at the lower end of the third mounting hole, and the movable electrode is slidably fitted at the upper end of the third mounting hole. Both the fixed electrode and the movable electrode are covered with an insulating sleeve.

[0010] The active electrode has a first mounting hole on the end face facing the fixed electrode. A first contact and a support spring are provided in the first mounting hole. The bottom end of the support spring abuts against the upper end of the first contact. When the support spring is in a free state, the first contact protrudes out of the first mounting hole and can retract into the first mounting hole against the elastic force of the support spring when compressed.

[0011] The fixed electrode has a second mounting hole on its end face facing the movable electrode. A second contact is provided in the second mounting hole, and the end of the second contact protrudes out of the second mounting hole.

[0012] Furthermore, slag collection grooves are provided at the edges of the openings of the first and second mounting holes; the slag collection grooves are used to accommodate the deformation of the first and second contacts under the action of electric arc ablation, as well as the residue formed by the first and second contacts during the ablation process.

[0013] Furthermore, the two end faces of the fixed electrode and the movable electrode that are opposite each other are two parallel planes.

[0014] Furthermore, the first mounting hole is a through hole extending along the length of the movable electrode, the first contact is located at the lower end inside the first mounting hole, and a terminal block is located at the upper end inside the first mounting hole. The two ends of the support spring abut against the ends of the first contact and the terminal block, respectively. A vent hole extending along the length and communicating with the first mounting hole is opened at the center of the terminal block.

[0015] Furthermore, the active electrode includes a magnetic adsorption block, which is used to magnetically engage with the electromagnet core. When the electromagnet core is energized, it generates a magnetic force that drags the magnetic adsorption block to move.

[0016] Furthermore, the inner wall of the third mounting hole is provided with several limiting grooves extending along the length direction, and the outer wall of the insulating sleeve is provided with limiting strips that cooperate with the several limiting grooves.

[0017] Furthermore, a protective shell is provided outside the electromagnet core; a first cover plate is provided on the top of the protective shell, and a second cover plate is provided on the bottom of the protective shell; the movable electrode passes through the first cover plate and slides in cooperation with the first cover plate.

[0018] Furthermore, the electromagnet core has several first through holes extending along its length, the first cover plate has several second through holes corresponding to the first through holes, and the second cover plate has several third through holes corresponding to the first through holes. A first limiting tube inserted into the first through hole is provided at the bottom of the second through hole, and a second limiting tube inserted into the first through hole is provided at the top of the third through hole. The two ends of the first through hole are connected to the outside through the first limiting tube and the second limiting tube, respectively.

[0019] Furthermore, a ring tube is provided on the top of the first cover plate, the upper end of the first limiting tube extends upward and is inserted into the ring tube and communicates with the inside of the ring tube, and a pipe joint is connected to the upper end of the ring tube, and the pipe joint communicates with the inside of the ring tube.

[0020] The beneficial effects of adopting the above technical solution are as follows: The high-voltage contact protection relay for mining frequency converters provided by the present invention, through the first contact and the second contact, ensures that the moving electrode contacts the fixed electrode first during the process of contacting the fixed electrode under the drive of the electromagnet core, and then separates the moving electrode from the fixed electrode during the separation process under the action of the support spring. This ensures that the arcing position of the positive and negative poles of the high-voltage power supply is located on the first contact and the second contact, that is, the ablation position is located on the first contact and the second contact. By changing the arc formation position and making the formation position far away from the end faces of the fixed electrode and the moving electrode, which are current conduction structures, it can effectively prevent the formation of an arc on the contact surface of the fixed electrode and the moving electrode, thereby protecting the contact between the fixed electrode and the moving electrode, reducing poor contact caused by ablation, and improving its stability and reliability. Attached Figure Description

[0021] Figure 1 The high-voltage contact protection relay for mining frequency converters provided in this embodiment of the invention is a three-dimensional relay. Figure 1 ;

[0022] Figure 2 The high-voltage contact protection relay for mining frequency converters provided in this embodiment of the invention is a three-dimensional relay. Figure 2 ;

[0023] Figure 3 This is a front view of a high-voltage contact protection relay for a mining frequency converter provided in an embodiment of the present invention;

[0024] Figure 4 for Figure 3 Sectional view of AA;

[0025] Figure 5 for Figure 4 Enlarged view of B in the middle;

[0026] Figure 6 A schematic diagram of the mating structure of the fixed electrode and the movable electrode provided in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of an electromagnet core provided in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the cooperation structure between the protective shell, the first cover plate, and the second cover plate provided in an embodiment of the present invention.

[0029] In the diagram: 1. Fixed electrode; 2. Movable electrode; 3. Electromagnetic core; 4. Elastic support structure; 5. First mounting hole; 6. First contact; 7. Support spring; 8. Second mounting hole; 9. Second contact; 10. Slag collection trough; 11. Terminal block; 12. Air guide hole; 13. Third mounting hole; 14. Insulating sleeve; 15. Magnetic adsorption block; 16. Limiting groove; 17. Limiting strip; 18. Protective shell; 19. First cover plate; 20. Second cover plate; 21. First through hole; 22. Second through hole; 23. Third through hole; 24. First limiting tube; 25. Second limiting tube; 26. Ring pipe; 27. Pipe joint. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0031] like Figures 1 to 8 As shown, a high-voltage contact protection relay for a mining frequency converter includes a fixed electrode 1, a movable electrode 2, and an electromagnet core 3. An elastic support structure 4 is provided between the fixed electrode 1 and the movable electrode 2, and the electrodes are separated under the action of the elastic support structure 4. The electromagnet core 3 is used to push the movable electrode 2 to apply a thrust, causing the movable electrode 2 to overcome the elastic force of the elastic support structure 4 and slide into contact with the fixed electrode 1. Figure 4 , Figure 5 and Figure 6 As shown, the movable electrode 2 has a first mounting hole 5 on its end face facing the fixed electrode 1. A first contact 6 and a support spring 7 are disposed in the first mounting hole 5. The bottom end of the support spring 7 abuts against the upper end of the first contact 6. When the support spring 7 is in a free state, the first contact 6 protrudes out of the first mounting hole 5 and can retract into the first mounting hole 5 against the elastic force of the support spring 7 when compressed. The fixed electrode 1 has a second mounting hole 8 on its end face facing the movable electrode 2. A second contact 9 is disposed in the second mounting hole 8.

[0032] Fixed electrode 1 and movable electrode 2 are used as the positive and negative terminals for connection to a high-voltage power supply, respectively. Electromagnetic core 3 is used for connection to a low-voltage control power supply. The low-voltage power supply can generate magnetic force in electromagnetic core 3 to drive movable electrode 2 to move, making movable electrode 2 conductive with fixed electrode 1, so that the high-voltage power supply can be connected to start the equipment. First contact 6 is slidably fitted in first mounting hole 5 and protrudes out of first mounting hole 5 under the action of support spring 7, that is, protrudes from the end face of movable electrode 2 facing fixed electrode 1. Second contact 9 is disposed in second mounting hole 8 and is disposed opposite to first contact 6. When movable electrode 2 contacts fixed electrode 1 under the action of electromagnetic core 3, first contact 6 and second contact 9 will contact first, and first contact 6 will be squeezed and pushed into first mounting hole 5 while maintaining contact with second contact 9. When the electromagnet core 3 is de-energized, the movable electrode 2 and the fixed electrode 1 will separate under the push of the elastic support structure 4. During the separation process, the end faces of the fixed electrode 1 and the movable electrode 2 will separate first, and the first contact 6 will extend out of the first mounting hole 5 under the action of the support spring 7 while maintaining contact with the second contact 9, and then separate from the second contact 9.

[0033] Therefore, the first contact 6 and the second contact 9 will first contact the movable electrode 2 when it contacts the fixed electrode 1 under the drive of the electromagnet core 3, and then separate the movable electrode 2 from the fixed electrode 1 under the action of the support spring 7. This will cause the arcing positions of the positive and negative poles of the high voltage power supply to be located on the first contact 6 and the second contact 9, that is, the ablation positions will be located on the first contact 6 and the second contact 9. By changing the arc formation position and making the formation position far away from the end faces of the fixed electrode 1 and the movable electrode 2, which are current conduction structures, it is possible to effectively prevent the formation of an arc on the contact surface of the fixed electrode 1 and the movable electrode 2, so as to protect the contact between the fixed electrode 1 and the movable electrode 2, reduce the poor contact caused by ablation, and improve its stability and reliability.

[0034] The fixed electrode 1 and the movable electrode 2 can be made of materials with good conductivity, such as copper or silver, and the first contact 6 and the second contact 9 can be made of metals with high melting points, such as tungsten, so as to reduce the damage caused by arc erosion.

[0035] In this embodiment, the end of the second contact 9 protrudes beyond the second mounting hole 8. That is, the initial contact point and the final separation point of the first contact 6 and the second contact 9 are both located between the end faces of the fixed electrode 1 and the movable electrode 2, so that the position where the electric arc is formed is far away from the end faces of the fixed electrode 1 and the movable electrode 2, thereby further improving the protection effect on the contact surface of the fixed electrode 1 and the movable electrode 2.

[0036] In this embodiment, slag collection grooves 10 are provided at the edges of the openings of both the first mounting hole 5 and the second mounting hole 8, such as... Figure 5As shown. The slag collection tank 10 is used to accommodate the deformation of the first contact 6 and the second contact 9 under the action of electric arc ablation, and to serve as a space for accommodating the residue formed by the first contact 6 and the second contact 9 during the ablation process. The deformation of the first contact 6 and the second contact 9 due to electric arc ablation and the falling residue affect the contact between the fixed electrode 1 and the movable electrode 2.

[0037] In this embodiment, the end faces of the fixed electrode 1 and the movable electrode 2 facing each other are two parallel planes to increase the contact area when they come into contact and reduce the resistance of the contact surface. In specific implementation, the two end faces can also be a convex surface and a concave surface that are parallel to each other.

[0038] In this embodiment, the first mounting hole 5 is a through hole extending along the length of the movable electrode 2. The first contact 6 is located in the lower end of the first mounting hole 5, and a terminal 11 is located in the upper end of the first mounting hole 5. The two ends of the support spring 7 abut against the ends of the first contact 6 and the terminal 11, respectively. A vent hole 12 extending along the length and communicating with the first mounting hole 5 is opened in the center of the terminal 11. The terminal 11 serves as a sealing structure for the first mounting hole 5 and a connection structure for the external circuit. Its center is connected to the first mounting hole 5 through the vent hole 12, preventing air in the first mounting hole 5 from obstructing the movement of the first contact 6.

[0039] In this embodiment, the electromagnet core 3 has a third mounting hole 13 extending along its length, such as... Figure 7 As shown, the fixed electrode 1 is fixedly fitted inside the lower end of the third mounting hole 13, and the movable electrode 2 is slidably fitted inside the upper end of the third mounting hole 13. Both the fixed electrode 1 and the movable electrode 2 are covered with an insulating sleeve 14.

[0040] The active electrode 2 includes a magnetic adsorption block 15, which is used to magnetically engage with the electromagnet core 3. When the electromagnet core 3 is energized, it generates a magnetic force that drags the magnetic adsorption block 15 to move.

[0041] The third mounting hole 13 serves as the mounting space for the fixed electrode 1 and the movable electrode 2, and also as a sliding support structure for the movable electrode 2. Both the fixed electrode 1 and the movable electrode 2 are covered with insulating sleeves 14 to prevent short circuits caused by conduction with the electromagnet core 3. The insulating sleeves 14 are made of high-temperature resistant hard plastic. The magnetic adsorption block 15 serves as an adsorption structure that cooperates with the electromagnet core 3. It can be located inside or outside the third mounting hole 13, and is used to push the movable electrode 2 along the third through hole 23 under the magnetic force of the electromagnet core 3.

[0042] In this embodiment, the inner wall of the third mounting hole 13 is provided with a plurality of limiting grooves 16 extending along the length direction, and the outer wall of the insulating sleeve 14 is provided with limiting strips 17 that cooperate with the limiting grooves 16. Through the cooperation of the limiting grooves 16 and the limiting strips 17, a radial rotation limiting structure can be formed for the insulating sleeve 14 in the third mounting hole 13, preventing it from rotating during sliding and thus improving the stability of the overall structure.

[0043] In this embodiment, a protective shell 18 is provided outside the electromagnet core 3. A first cover plate 19 is provided on the top of the protective shell 18, and a second cover plate 20 is provided on the bottom of the protective shell 18. Figure 1 , Figure 2 and Figure 3 , Figure 8 As shown, the movable electrode 2 passes through the first cover plate 19 and slides in cooperation with the first cover plate 19. The protective shell 18 serves as a protective structure for the electromagnet core 3. Its top and bottom are respectively clamped onto the electromagnet core 3 by the first cover plate 19 and the second cover plate 20 to fix the electromagnet core 3. The second cover plate 20 serves as a mounting and fixing structure for the fixed electrode 1, so that the fixed electrode 1 is fixed in the third mounting hole 13.

[0044] In this embodiment, the electromagnet core 3 has several first through holes 21 extending along its length, the first cover plate 19 has several second through holes 22 corresponding to the first through holes 21, the second cover plate 20 has several third through holes 23 corresponding to the first through holes 21, the bottom of the second through hole 22 is provided with a first limiting tube 24 inserted into the first through hole 21, and the top of the third through hole 23 is provided with a second limiting tube 25 inserted into the first through hole 21. The two ends of the first through hole 21 are connected to the outside through the first limiting tube 24 and the second limiting tube 25, respectively.

[0045] The first cover plate 19 and the second cover plate 20 are respectively inserted into the two ends of the first through hole 21 through the first limiting tube 24 and the second limiting tube 25 to improve the connection structure strength between the first cover plate 19 and the second cover plate 20 and the electromagnet core 3. The two ends of the first through hole 21 are connected to the outside through the first limiting tube 24 and the second limiting tube 25, which will serve as a flow channel for heat exchange medium such as air, which is conducive to dissipating the heat generated during operation and avoiding damage caused by internal heat accumulation.

[0046] In this embodiment, a ring tube 26 is provided on the top of the first cover plate 19, and the upper end of the first limiting tube 24 extends upward and is inserted into the ring tube 26 and communicates with the inside of the ring tube 26. A pipe joint 27 is connected to the ring tube 26 and communicates with the inside of the ring tube 26.

[0047] The ring pipe 26 is connected to the first limiting pipe 24 and the first through hole 21, and is also connected to the pipe joint 27. The pipe joint 27 can be used to connect compressed air as an air source to introduce air into the first through hole 21 so that the heat generated by the electromagnet core 3 during operation or during the arc erosion process can be discharged outward through the air as a heat exchange medium.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.

Claims

1. A high-voltage contact protection relay for a mining frequency converter, characterized in that: The high-voltage contact protection relay includes a fixed electrode (1), a movable electrode (2), and an electromagnet core (3); An elastic support structure (4) is provided between the fixed electrode (1) and the movable electrode (2), and the two electrodes are separated under the action of the elastic support structure (4). The electromagnet core (3) is used to push the movable electrode (2) to apply a thrust, so that the movable electrode (2) overcomes the elastic force of the elastic support structure (4) and slides to contact the fixed electrode (1). The electromagnet core (3) has a third mounting hole (13) extending through the length direction. The third mounting hole (13) serves as the mounting space for the fixed electrode (1) and the movable electrode (2), as well as a sliding support structure for the movable electrode (2). The fixed electrode (1) is fixedly installed at the lower end of the third mounting hole (13), and the movable electrode (2) is slidably fitted at the upper end of the third mounting hole (13). Both the fixed electrode (1) and the movable electrode (2) are covered with an insulating sleeve (14). The active electrode (2) has a first mounting hole (5) on the end face facing the fixed electrode (1). A first contact (6) and a support spring (7) are provided in the first mounting hole (5). The bottom end of the support spring (7) abuts against the upper end of the first contact (6). When the support spring (7) is in a free state, the first contact (6) protrudes out of the first mounting hole (5) and can retract into the first mounting hole (5) when squeezed, overcoming the elastic force of the support spring (7). The fixed electrode (1) has a second mounting hole (8) on the end face facing the movable electrode (2). A second contact (9) is provided in the second mounting hole (8), and the end of the second contact (9) protrudes out of the second mounting hole (8).

2. The high-voltage contact protection relay for mining frequency converters according to claim 1, characterized in that: The first mounting hole (5) and the second mounting hole (8) are provided with slag collection grooves (10) at their opening edges; the slag collection grooves (10) are used to accommodate the deformation of the first contact (6) and the second contact (9) under the action of electric arc ablation, as well as the residue formed by the first contact (6) and the second contact (9) during the ablation process.

3. The high-voltage contact protection relay for mining frequency converters according to claim 1, characterized in that: The two end faces of the fixed electrode (1) and the movable electrode (2) are two parallel planes.

4. The high-voltage contact protection relay for mining frequency converters according to claim 1, characterized in that: The first mounting hole (5) is a through hole that extends along the length of the movable electrode (2). The first contact (6) is located at the lower end inside the first mounting hole (5). A terminal post (11) is located at the upper end inside the first mounting hole (5). The two ends of the support spring (7) abut against the ends of the first contact (6) and the terminal post (11) respectively. A vent hole (12) that extends along the length and communicates with the first mounting hole (5) is opened in the center of the terminal post (11).

5. The high-voltage contact protection relay for mining frequency converters according to any one of claims 1 to 4, characterized in that: The active electrode (2) includes a magnetic adsorption block (15), which is used to magnetically engage with the electromagnet core (3). When the electromagnet core (3) is energized, it generates a magnetic force to drag the magnetic adsorption block (15) to move.

6. The high-voltage contact protection relay for mining frequency converters according to claim 5, characterized in that: The inner wall of the third mounting hole (13) is provided with several limiting grooves (16) extending along the length direction, and the outer wall of the insulating sleeve (14) is provided with limiting strips (17) that cooperate with the several limiting grooves (16).

7. The high-voltage contact protection relay for mining frequency converters according to claim 6, characterized in that: The electromagnet core (3) is provided with a protective shell (18); a first cover plate (19) is provided on the top of the protective shell (18), and a second cover plate (20) is provided on the bottom of the protective shell (18); the movable electrode (2) passes through the first cover plate (19) and slides with the first cover plate (19).

8. The high-voltage contact protection relay for mining frequency converters according to claim 7, characterized in that: The electromagnet core (3) has several first through holes (21) extending along its length. The first cover plate (19) has several second through holes (22) corresponding to the first through holes (21). The second cover plate (20) has several third through holes (23) corresponding to the first through holes (21). The bottom of the second through hole (22) is provided with a first limiting tube (24) inserted into the first through hole (21). The top of the third through hole (23) is provided with a second limiting tube (25) inserted into the first through hole (21). The two ends of the first through hole (21) are connected to the outside through the first limiting tube (24) and the second limiting tube (25) respectively.

9. The high-voltage contact protection relay for mining frequency converters according to claim 8, characterized in that: The top of the first cover plate (19) is provided with a ring pipe (26), the upper end of the first limiting pipe (24) extends upward and is inserted into the ring pipe (26), and communicates with the inside of the ring pipe (26). The upper end of the ring pipe (26) is connected to a pipe joint (27), and the pipe joint (27) communicates with the inside of the ring pipe (26).

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