High-voltage pre-charging relay

Abstract

The invention discloses a high-voltage pre-charging relay, which belongs to the technical field of relays and comprises a relay body, the relay body comprises a shell and a base, a mounting frame, an electromagnet, a spring, an armature, a static contact and a movable contact are arranged in a cavity formed by the shell and the base, and an arc extinguishing mechanism is arranged between the static contact and the movable contact. The arc extinguishing mechanism comprises a plurality of sleeves and grid pieces, a connecting rod is movably connected between every two adjacent sleeves, and a blowing mechanism is arranged below the arc extinguishing mechanism. According to the invention, when the static contact and the movable contact in the relay are separated, the electric arc is captured by the grid pieces with smaller spacing distance, and then the distance between the grid pieces is increased; the arc is stretched more sufficiently among the grid plates, the length of the arc is increased, the temperature of the arc is effectively reduced, heat generated by the arc can be dispersed on a larger area due to larger gaps, cooling of the arc is accelerated, the risk of arc reignition caused by local overheating is avoided, and the service life is prolonged.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of relays, and in particular to a high-voltage pre-charging relay. Background Art

[0002] A relay is an electrical control device that uses signals from low-voltage, low-current circuits to control the on and off of high-voltage, high-current circuits. The basic function of a relay is to act as an electromagnetic switch, using the magnetic field generated by an electromagnetic coil to drive the mechanical switch to connect or disconnect the circuit. The high-voltage pre-charging relay controls the opening and closing of the pre-charging circuit, while the pre-charging resistor limits the current, ensuring the stability and safe operation of the high-voltage system.

[0003] The pre-charging relay mainly includes an electromagnetic coil, an armature, contacts, a pre-charging resistor, a main contactor, a filter capacitor, an insulating casing and connecting wires. In the relay, when the moving contact and the static contact are separated, if there is still current flowing in the circuit, the sudden interruption of the current will generate a high voltage between the contacts, thereby causing the gas medium (usually air) to break down and form an arc. The arc will generate high temperature, corrode the contact material, reduce the service life of the relay, and may also cause a fire or damage surrounding equipment. The current methods for arc extinguishing mainly include magnetic blowing arc extinguishing, grid arc extinguishing, arc extinguishing chamber, increasing the contact separation distance and using special materials.

[0004] If grids are used for arc extinguishing, an arc extinguishing grid is required. The grids are composed of a series of thin metal sheets (grids) arranged at intervals. When the arc is captured by the grids, it is stretched along the gaps between the grids, increasing the length of the arc. This stretching effect helps to cool the arc, reduce its energy, and make it easier to extinguish. When the arc passes through the arc extinguishing grid, a voltage drop is generated on each grid, which helps to disperse the heat and energy of the arc and reduce the intensity of the arc. When using an arc extinguishing grid, the smaller the gaps between the grids, the smaller the gaps between the grids. According to the Lorentz force principle, the interaction between the magnetic field and the current will generate electromagnetic force. When the gaps in the arc extinguishing grid are smaller, the arc is more easily attracted to these gaps under the action of the electromagnetic force and is captured by the arc extinguishing grid. However, if the gaps are too small, it may limit the dissipation of heat and cause local overheating of the arc extinguishing grid. , the cooling and heat dissipation capacity of the arc extinguishing grid will decrease, which will increase the risk of arc reignition. The larger the gap between the grids, the more difficult it is for the arc extinguishing grid to capture the arc. However, the increase in the gap helps the arc to be more fully stretched between the grids, increasing the length of the arc, which can effectively reduce the temperature of the arc and reduce the energy of the arc, which is beneficial to arc extinguishing. The larger gap allows the heat generated by the arc to be dispersed over a larger area, which helps to transfer the heat to the surrounding environment faster and accelerate the cooling of the arc. At present, the distance between the arc extinguishing grids cannot be well controlled. When choosing, either the distance between the grids is close, which improves the ability to capture the arc and reduces the effect of heat dissipation and arc extinguishing, or the distance between the grids is far, which improves the effect of heat dissipation and arc extinguishing and reduces the ability to capture the arc. Summary of the invention

[0005] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the present invention mainly provides a high-voltage pre-charging relay to solve the technical problem that the arc extinguishing grid in the current relay proposed in the above background technology cannot be well controlled in terms of the distance between the grids. Either the distance between the grids is too close to improve the ability to capture arcs, or the distance between the grids is too far to improve the effect of heat dissipation and arc extinguishing, and it is impossible to have both high arc capture ability and heat dissipation effect.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: A high-voltage pre-charging relay comprises a relay body, wherein the relay body comprises a shell and a base, and a mounting frame is arranged in a cavity formed by the shell and the base, and an electromagnet, a spring, an armature, a static contact and a moving contact are arranged on the mounting frame, and an upper edge of the armature and the mounting frame are hinged, and the armature drives the moving contact to separate from the static contact, and an arc extinguishing mechanism is arranged between the static contact and the moving contact, and the arc extinguishing mechanism comprises a plurality of sleeves arranged linearly at equal intervals, each of the sleeves is provided with a grid sheet, and a connecting rod is movably connected between each adjacent two sleeves, and a blower mechanism is arranged below the arc extinguishing mechanism, and the blower mechanism is located on the base.

[0007] Furthermore, a driving frame and a positioning frame are respectively provided on the two sleeves located at the end portions, and the positioning frames are mounted on the inner wall of the outer shell by screws.

[0008] Furthermore, the blowing mechanism includes a first plug and a second plug, an outer tube and an inner liner are arranged between the first plug and the second plug, the inner liner is located inside the outer tube, and a gap is left between the inner liner and the outer tube, and a plurality of nozzles are linearly arranged at equal intervals on the outer tube, and the nozzles are facing between adjacent grid plates.

[0009] Furthermore, a connection port is provided at one end of the liner.

[0010] Furthermore, the inner cavity of the liner is movably connected to a piston rod, and one end of the piston rod passes through the second plug and is connected to the lower end of the drive frame.

[0011] Furthermore, a pressing plate is provided on the piston rod, a return spring is provided on one side of the pressing plate, and the return spring is sleeved on the piston rod.

[0012] Furthermore, a pneumatic protection mechanism is provided on one side of the outer wall of the shell, and the pneumatic protection mechanism includes a side frame, and a sealing box, a first air pump and a second air pump are provided on the side frame, a first connecting pipe is provided between the sealing box and the first air pump, an air guide pipe is provided at the output end of the first air pump, and the air guide pipe is connected to the first plug, a second connecting pipe is provided between the second air pump and the sealing box, and an exhaust pipe is provided at the input end of the second air pump, and the exhaust pipe is connected to the interface on the shell.

[0013] Furthermore, both the first connecting pipe and the second connecting pipe are provided with solenoid valves.

[0014] Furthermore, a bending frame is provided on the upper side of the shell.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes that when the static contact and the moving contact in the relay are separated, the electromagnetic force generated by the interaction between the magnetic field and the current according to the Lorentz force principle is used to first capture the arc with the help of the grids with a smaller spacing, thereby improving the efficiency and comprehensiveness of capturing the arc. Then, the distance between the grids is increased, so that the arc is more fully stretched between the grids, thereby increasing the length of the arc, thereby effectively reducing the temperature of the arc and the energy of the arc. Moreover, the larger gap allows the heat generated by the arc to be dispersed over a larger area, which helps to transfer the heat to the surrounding environment faster and accelerate the cooling of the arc. At the same time, the moving distance of the arc between the grids is increased, so that the arc heat and erosion borne by each grid are relatively reduced, thereby extending the service life of the arc extinguishing grid, and avoiding the current situation that the arc cannot be effectively stretched and cooled due to the unreasonable design of the arc extinguishing grid, such as the grid spacing is too large or too small, resulting in local overheating and the reignition of the arc. The present invention realizes that under the premise that the electromagnet does not provide traction force, when the armature drives the moving contact to separate from the static contact, one end of the sleeve can be pulled under the action of external air pressure, so that the distance between the grid plates is increased, and after the air pressure ends, the grid plates are driven to reset under the action of the reset spring, so that the moving and static contacts can be reused each time they are disconnected, and the distance between the grid plates can be quickly switched without replacement. The gaps between the grid plates are blown by the mutual cooperation between the connecting port and the nozzle. Since the appropriate increase in the gap can improve the flow of the arc extinguishing medium (insulating gas), the arc extinguishing efficiency is further improved, the limit value that can withstand the rated voltage is increased, and the service life is improved. The present invention realizes the injection of insulating gas into the lining by arranging the side frame, the sealing box, the first air pump, the air guide pipe and the first connecting pipe. The insulating gas can provide a driving force for the separation between the grid plates, and also achieves the purpose of reducing the temperature between the grid plates. In addition, the mutual cooperation between the second air pump, the exhaust pipe, the solenoid valve and the second connecting pipe can recycle the insulating gas in the cavity formed by the outer shell and the base, which is convenient for next use and saves costs. The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall plan view of the present invention; Figure 2 It is a front plan view of the relay body of the present invention; Figure 3 It is a schematic plan view of the internal structure of the relay body of the present invention; Figure 4 It is a schematic diagram of the back side of the relay body of the present invention; Figure 5 It is a plan view schematic diagram of the arc extinguishing mechanism and the blower of the present invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of area A.

[0017] In the figure: 1. relay body; 11. housing; 12. base; 13. mounting frame; 14. electromagnet; 15. spring; 16. armature; 17. static contact; 18. moving contact; 2. pneumatic protection mechanism; 21. side frame; 22. sealing box; 23. first air pump; 231. air guide tube; 24. second air pump; 241. exhaust pipe; 25. first connecting pipe; 26. solenoid valve; 27. second connecting pipe; 3. bending frame; 4. arc extinguishing mechanism; 41. sleeve; 42. grid; 43. connecting rod; 44. driving frame; 45. positioning frame; 5. blowing mechanism; 51. first plug; 52. second plug; 53. outer tube; 54. lining; 541. connecting port; 55. piston rod; 551. pressing piece; 56. nozzle; 57. reset spring. DETAILED DESCRIPTION

[0018] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] Example 1, please refer to the attached Figure 1-6As shown, a high-voltage pre-charging relay includes a relay body 1, wherein the relay body 1 includes a shell 11 and a base 12, and a mounting frame 13 is arranged in a cavity formed by the shell 11 and the base 12, and an electromagnet 14, a spring 15, an armature 16, a static contact 17 and a moving contact 18 are arranged on the mounting frame 13, and the upper edge of the armature 16 and the mounting frame 13 are hinged, and the armature 16 drives the moving contact 18 to separate from the static contact 17, and an arc extinguishing mechanism 4 is arranged between the static contact 17 and the moving contact 18, and the arc extinguishing mechanism 4 includes a plurality of sleeves 41 arranged linearly at equal intervals, each of the sleeves 41 is provided with a grid 42, and a connecting rod 43 is movably connected between each adjacent two sleeves 41, and a blower mechanism 5 is arranged below the arc extinguishing mechanism 4, and the blower mechanism 5 is located on the base 12.

[0022] The above structure realizes that when the static contact 17 and the moving contact 18 in the relay are separated, the arc is first captured by the grid pieces 42 with a smaller spacing, and then the distance between the grid pieces 42 is increased, so that the arc is more fully stretched between the grid pieces 42, the length of the arc is increased, the temperature of the arc is effectively reduced, and the energy of the arc is reduced. The larger gap allows the heat generated by the arc to be dispersed over a larger area, which helps to transfer the heat to the surrounding environment more quickly and accelerate the cooling of the arc. At the same time, the moving distance of the arc between the grid pieces 42 is increased, and the arc heat and erosion to which each grid piece 42 is subjected is relatively reduced, thereby extending the service life of the arc extinguishing grid and avoiding the risk of arc reignition due to local overheating. The appropriate increase in the gap can improve the flow of the arc extinguishing medium (insulating gas), further improving the arc extinguishing efficiency, increasing the limit value that can withstand the rated voltage, and improving the service life.

[0023] The specific operation is as follows: under the premise that the electromagnet 14 does not provide traction, the spring 15 is restored and reset, and the moving contact 18 is pulled apart from the static contact 17 through the armature 16. At this time, the voltage gradient between the contacts becomes very high, causing the generation of an arc. At the same time, the first air pump 23 and the solenoid valve 26 on the first connecting pipe 25 are opened, and the insulating gas enters the liner 54 through the air guide pipe 231, pushing the piston rod 55, and the reset spring 57 is compressed. Then, the piston rod 55 drives one end of the sleeve 41 to move through the drive frame 44, and with the cooperation of the connecting rod 43, the distance between the grid sheet 42 is increased. As the piston rod 55 moves, the connection port 541 is exposed, and then the gas is ejected from the nozzle 56 through the gap between the liner 54 and the outer tube 53 to purge and cool the grid plates 42. After the end, the reset spring 57 is restored to its original position and drives the grid plates 42 to move back through the drive frame 44 (the grid plates 42 do not need to be evenly spaced, as long as the overall distance between them is smaller), and then the solenoid valve 26 on the first connecting pipe 25 is closed, and the solenoid valve 26 and the second air pump 24 on the second connecting pipe 27 are opened, and then the gas in the housing 11 is pumped into the sealing box 22.

[0024] Example 2, please refer to the attached Figure 1 , 2 As shown in Figure 4, a pneumatic protection mechanism 2 is provided on one side of the outer wall of the housing 11, and the pneumatic protection mechanism 2 includes a side frame 21, and a sealing box 22, a first air pump 23 and a second air pump 24 are provided on the side frame 21. There is insulating gas in the sealing box 22, and a first connecting pipe 25 is provided between the sealing box 22 and the first air pump 23. An air guide pipe 231 is provided at the output end of the first air pump 23, and the air guide pipe 231 is connected to the first plug 51. A second connecting pipe 27 is provided between the second air pump 24 and the sealing box 22, and the output end of the second air pump 24 is connected to the first plug 51. An exhaust pipe 241 is provided at the inlet end, and the exhaust pipe 241 is connected to the interface on the outer shell 11. The injection and extraction of insulating gas are realized through the first air pump 23, the second air pump 24, the first connecting pipe 25, the second connecting pipe 27, the air guide pipe 231 and the exhaust pipe 241. The first connecting pipe 25 and the second connecting pipe 27 are both provided with an electromagnetic valve 26. The on-off control of the first connecting pipe 25 and the second connecting pipe 27 is realized through the electromagnetic valve 26. A bending frame 3 is provided on the upper side of the outer shell 11. The installation of the outer shell 11 is realized through the bending frame 3.

[0025] Example 3, please refer to the attached Figure 5 and 6As shown, the two sleeves 41 at the end are respectively provided with a driving frame 44 and a positioning frame 45, and the positioning frame 45 is installed on the inner wall of the shell 11 by screws. The sleeve 41 at one end is positioned by the positioning frame 45. The blower mechanism 5 includes a first plug 51 and a second plug 52. An outer tube 53 and an inner liner 54 are arranged between the first plug 51 and the second plug 52. The inner liner 54 is located in the outer tube 53, and a gap is left between the inner liner 54 and the outer tube 53. A plurality of nozzles 56 are linearly arranged at equal intervals on the outer tube 53, and the nozzles 56 face between adjacent grid sheets 42. Through the mutual cooperation between the inner liner 54, the outer tube 53 and the nozzles 56, the blower mechanism 5 is realized. In order to blow air between the grid plates 42, a connecting port 541 is provided at one end of the liner 54, through which the liner 54 and the outer tube 53 are connected, and the inner cavity of the liner 54 is movably connected with a piston rod 55, and one end of the piston rod 55 passes through the second plug 52 and is connected to the lower end of the drive frame 44, and the traction of the sleeve 41 is achieved through the mutual cooperation between the piston rod 55 and the drive frame 44, and a pressing plate 551 is provided on the piston rod 55, and a return spring 57 is provided on one side of the pressing plate 551, and the return spring 57 is sleeved on the piston rod 55, and through the return spring 57 and the pressing plate 551, the piston rod 55 is reset when the first air pump 23 stops running.

[0026] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A high-voltage pre-charging relay, comprising a relay body (1), the relay body (1) comprising a housing (11) and a base (12), a mounting frame (13) being arranged in a cavity formed by the housing (11) and the base (12), the mounting frame (13) being provided with an electromagnet (14), a spring (15), an armature (16), a static contact (17) and a moving contact (18), the upper edge of the armature (16) and the mounting frame (13) being hinged, the armature (16) driving the moving contact (18) to separate from the static contact (17), characterized in that An arc extinguishing mechanism (4) is provided between the static contact (17) and the movable contact (18), the arc extinguishing mechanism (4) comprising a plurality of sleeves (41) linearly arranged at equal intervals, each sleeve (41) being provided with a grid sheet (42), and a connecting rod (43) being movably connected between each two adjacent sleeves (41), and a blower mechanism (5) being provided below the arc extinguishing mechanism (4), the blower mechanism (5) being located on the base (12).

2. A high voltage pre-charging relay according to claim 1, characterized in that: A driving frame (44) and a positioning frame (45) are respectively provided on the two sleeves (41) located at the end portions, and the positioning frame (45) is mounted on the inner wall of the housing (11) by means of screws.

3. A high voltage pre-charging relay according to claim 1, characterized in that: The air blowing mechanism (5) comprises a first plug (51) and a second plug (52); an outer tube (53) and an inner liner (54) are arranged between the first plug (51) and the second plug (52); the inner liner (54) is located inside the outer tube (53), and a gap is left between the inner liner (54) and the outer tube (53); a plurality of nozzles (56) are linearly arranged at equal intervals on the outer tube (53), and the nozzles (56) face between adjacent grid sheets (42).

4. A high voltage pre-charging relay according to claim 3, characterized in that: A connection port (541) is provided at one end of the liner (54).

5. A high voltage pre-charging relay according to claim 4, characterized in that: The inner cavity of the liner (54) is movably connected to a piston rod (55), and one end of the piston rod (55) passes through the second plug (52) and is connected to the lower end of the drive frame (44).

6. A high voltage pre-charging relay according to claim 5, characterized in that: A pressing plate (551) is provided on the piston rod (55), a return spring (57) is provided on one side of the pressing plate (551), and the return spring (57) is sleeved on the piston rod (55).

7. A high voltage pre-charging relay according to claim 2, characterized in that: A pneumatic protection mechanism (2) is provided on one side of an outer wall of the housing (11), the pneumatic protection mechanism (2) comprising a side frame (21), a sealing box (22), a first air pump (23) and a second air pump (24) being provided on the side frame (21), a first connecting pipe (25) being provided between the sealing box (22) and the first air pump (23), an air guide pipe (231) being provided at the output end of the first air pump (23), and the air guide pipe (231) being connected to a first plug (51), a second connecting pipe (27) being provided between the second air pump (24) and the sealing box (22), an exhaust pipe (241) being provided at the input end of the second air pump (24), and the exhaust pipe (241) being connected to an interface on the housing (11).

8. A high voltage pre-charging relay according to claim 7, characterized in that: The first connecting pipe (25) and the second connecting pipe (27) are both provided with a solenoid valve (26).

9. A high voltage pre-charging relay according to claim 7, characterized in that: A bending frame (3) is provided on the upper side of the housing (11).

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