Hydraulic high-voltage contactor capable of being applied to strong magnetic environment

Abstract

The utility model discloses a hydraulic high-voltage contactor capable of being applied to a strong magnetic environment, which belongs to the technical field of high-voltage contactors and comprises a shell. Two high-voltage contact heads are mounted at the top end of the shell, and a contact bridge is movably mounted in the shell; a piston located in the piston cavity is installed below the contact bridge. A hydraulic transmission part is hermetically mounted at the bottom of the piston cavity through a butt joint port; a sealing ring is mounted on the piston; a sealing area is formed in the piston cavity between the piston and the butt joint opening, the piston can be controlled to move back and forth in the piston cavity towards the positions where the high-pressure contact heads are located by injecting liquid into or pumping liquid out of the sealing area through the hydraulic transmission component, and finally the contact bridge and the two high-pressure contact heads are controlled to be closed or disconnected at the same time. The hydraulic high-voltage contactor is controlled to be switched on and switched off in a hydraulic mode, the whole control process is not influenced by a strong magnetic environment, potential safety hazards such as control failure caused by strong magnetism do not exist, and the hydraulic high-voltage contactor has better stability and reliability when being applied.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage contactor technology, specifically a hydraulic high-voltage contactor that can be applied in strong magnetic environments. Background Technology

[0002] With the development of science and technology and the advancement of the national new energy vehicle industry development plan, the popularity of new energy vehicles is getting higher and higher. The high-voltage contactor in the high-voltage main circuit of new energy vehicles is the most critical component related to the upper and lower high voltage.

[0003] Currently, the high-voltage contactors used in new energy vehicles both domestically and internationally are electromagnetically driven high-voltage contactors, such as... Figures 1-2 As shown, the electromagnetically driven high-voltage contactor includes a housing 1, with two high-voltage contact heads 2 fixed on the top of the housing 1. A contact bridge 3 connected to a piston 4 is installed inside the housing 1. The piston 4 is a moving magnetic core made of magnetic material. The piston 4 can move within the piston chamber 5 inside the housing 1, and a low-voltage coil 6 is arranged around the piston 4. When the low-voltage coil 6 is energized, it magnetizes the piston 4 and generates an attractive force. The piston 4 attracts the iron block above it, thereby closing the high-voltage contactor.

[0004] However, when the electromagnetic high-voltage contactor is in a strong magnetic environment, it will magnetize the piston 4 and the iron block above it at the same time, making them two magnets with opposite polarities at their close ends. This will cause the high-voltage contactor to be uncontrollable when it is closed, which poses a significant safety hazard. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a hydraulic high-voltage contactor that can be applied in a strong magnetic environment. The hydraulic high-voltage contactor uses hydraulic means to control its closing and opening. The entire control process is not affected by the strong magnetic environment and there are no safety hazards such as control failure caused by strong magnetism. It has better stability and reliability when applied.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A hydraulically operated high-voltage contactor applicable in strong magnetic environments includes a housing;

[0008] Two high-voltage contact heads are fixedly installed at the top of the housing, and a contact bridge that can simultaneously close or open the two high-voltage contact heads is movably installed inside the housing.

[0009] A non-magnetic piston is concentrically mounted below the contact bridge, and the piston is located in the piston chamber inside the housing.

[0010] The bottom of the piston chamber is provided with a connection interface, and a hydraulic transmission component is sealed and installed inside the connection interface; a sealing ring that is sealed and fitted to the side wall of the piston chamber is installed on the piston body.

[0011] A sealing area is formed in the piston chamber between the piston and the counter-connection, and the liquid injection or extraction by the liquid transmission component into the sealing area can control the piston to move back and forth in the piston chamber to the positions of the high-voltage contact heads, so as to finally control the simultaneous closing or opening of the contact bridge and the two high-voltage contact heads.

[0012] By the above scheme, the liquid-operated high-voltage contactor controls its closing and opening in a liquid-operated manner, and the whole control process is not affected by the strong magnetic environment, and there is no safety hazard such as control failure caused by strong magnetic field, and the application has better stability and reliability.

[0013] As a preferred embodiment of the liquid-operated high-voltage contactor applicable in a strong magnetic environment, the liquid injected by the liquid transmission component into the sealing area formed in the piston chamber is cooling liquid.

[0014] By the above scheme, in order to further reduce the temperature inside and around the piston chamber, the cooling liquid such as ethylene glycol is used as a propellant to drive the piston, which can reduce the temperature inside and around the piston chamber.

[0015] As a preferred embodiment of the liquid-operated high-voltage contactor applicable in a strong magnetic environment, the liquid injected by the liquid transmission component into the sealing area formed in the piston chamber is lubricating liquid.

[0016] By the above scheme, in order to further lubricate the piston and reduce the wear and corrosion of the piston, the lubricating oil is used as a propellant to drive the piston, which not only lubricates the inner wall of the piston chamber, but also reduces the wear and corrosion of the piston.

[0017] As a preferred embodiment of the liquid-operated high-voltage contactor applicable in a strong magnetic environment, the contact bridge and the piston are concentrically connected through a connecting rod, and the lower half of the connecting rod is sleeved with a return spring for pushing the piston to move to the position of the counter-connection.

[0018] By the above scheme, in order to realize the automatic reset of the piston, when the liquid-operated assembly extracts liquid, the piston is pushed by the elastic force of the return spring to move to the position of the counter-connection, at this time the contact bridge and the two high-voltage contact heads are simultaneously opened, that is, the high-voltage contactor is automatically opened.

[0019] As a preferred embodiment of the liquid-operated high-voltage contactor applicable in a strong magnetic environment, the upper half of the connecting rod is concentrically connected with buckle one and buckle two, and the connecting rod is sleeved with a buffer spring between the buckle one and the buckle two.

[0020] The buckle one is above the buckle two, and the contact bridge is fixed on the buckle one, and the buffer spring pushes the buckle one to move to the position of the high-voltage contact head.

[0021] The above scheme is adopted, in order to slow down the impact force when the contact bridge contacts with the two high-voltage contact heads, a buffer spring is installed between the buckle one and the buckle two, and the buffer spring is compressed at the moment when the contact bridge contacts with the two high-voltage contact heads, that is, the impact force generated at the moment when the contact bridge contacts with the two high-voltage contact heads is converted into the elastic potential energy of the buffer spring, thereby prolonging the service life of the contact bridge.

[0022] A liquid-driven high-voltage contactor applicable in a strong magnetic environment comprises a shell;

[0023] Two high-voltage contact heads are fixedly installed at the top of the shell, and a contact bridge capable of simultaneously closing or disconnecting the two high-voltage contact heads is movably installed in the shell;

[0024] A piston made of non-magnetic material is concentrically installed below the contact bridge, and the piston is located in a piston chamber in the shell;

[0025] A counter port is formed in the bottom of the piston chamber, and a hydraulic transmission component is sealingly installed in the counter port;

[0026] A corrugated liquid capsule is placed in the piston chamber between the piston and the counter port, and the lower part of the corrugated liquid capsule is sealingly connected to the counter port;

[0027] A sealed area is formed in the corrugated liquid capsule, and the piston can be controlled to move back and forth in the piston chamber towards the high-voltage contact heads by injecting or pumping liquid into the sealed area through the hydraulic transmission component, so as to finally control the contact bridge to simultaneously close or disconnect the two high-voltage contact heads.

[0028] The above scheme is adopted, and the liquid-driven high-voltage contactor controls its closing and disconnecting in a liquid-driven manner, so that the entire control process is not affected by the strong magnetic environment, and there is no safety hazard such as control failure caused by strong magnetic field, and the application has better stability and reliability.

[0029] As a preferred embodiment of the liquid-driven high-voltage contactor applicable in a strong magnetic environment, the liquid injected into the sealed area of the corrugated liquid capsule by the hydraulic transmission component is a cooling liquid.

[0030] The above scheme is adopted, in order to further reduce the temperature in and around the corrugated liquid capsule, a cooling liquid such as ethylene glycol is used as a propellant to drive the corrugated liquid capsule to expand, thereby driving the piston, so as to reduce the temperature in and around the corrugated liquid capsule.

[0031] As a preferred embodiment of the liquid-driven high-voltage contactor applicable in a strong magnetic environment, the contact bridge and the piston are concentrically connected through a connecting rod, and the lower half of the connecting rod is sleeved with a return spring for driving the piston to move towards the counter port.

[0032] Adopting the above scheme, in order to realize the automatic reset of the piston, when the liquid driven assembly draws liquid, the piston is pushed to the place where the butt joint is located under the elastic action of the reset spring, at this time the contact bridge is disconnected with the two high-voltage contact heads at the same time, that is, the high-voltage contactor is automatically disconnected.

[0033] As a preferred embodiment of the liquid driven high-voltage contactor applicable in a strong magnetic environment, the upper half of the connecting rod is concentrically butted with buckle one and buckle two, wherein the connecting rod is sleeved with a buffer spring between the buckle one and the buckle two;

[0034] The buckle one is above the buckle two, and the contact bridge is fixed on the buckle one, wherein the buffer spring pushes the buckle one to move to the place where the high-voltage contact head is located.

[0035] Adopting the above scheme, in order to reduce the impact force when the contact bridge contacts the two high-voltage contact heads, a buffer spring is installed between the buckle one and the buckle two, and the buffer spring is compressed at the moment when the contact bridge contacts the two high-voltage contact heads, that is, the impact force generated at the moment when the contact bridge contacts the two high-voltage contact heads is converted into the elastic potential energy of the buffer spring, thereby prolonging the service life of the contact bridge.

[0036] After adopting the above technical scheme, the liquid driven high-voltage contactor has the following beneficial effects:

[0037] 1. The liquid driven high-voltage contactor adopts a liquid driven mode to control its closing and opening, and the whole control process is not affected by a strong magnetic environment, and there is no safety hazard such as control failure caused by a strong magnetic field, and the application has better stability and reliability;

[0038] 2. In order to further reduce the temperature inside and around the piston chamber, a cooling liquid such as ethylene glycol is used as a propellant to drive the piston, which can reduce the temperature inside and around the piston chamber.

[0039] 3. In order to further lubricate the piston and reduce the wear and corrosion of the piston, a lubricating oil is used as a propellant to drive the piston, which can not only lubricate the inner wall of the piston chamber, but also reduce the wear and corrosion of the piston;

[0040] 4. In order to realize the automatic reset of the piston, when the liquid driven assembly draws liquid, the piston is pushed to the place where the butt joint is located under the elastic action of the reset spring, at this time the contact bridge is disconnected with the two high-voltage contact heads at the same time, that is, the high-voltage contactor is automatically disconnected;

[0041] 5. In order to reduce the impact force when the contact bridge contacts the two high-voltage contact heads, a buffer spring is installed between the buckle one and the buckle two, and the buffer spring is compressed at the moment when the contact bridge contacts the two high-voltage contact heads, that is, the impact force generated at the moment when the contact bridge contacts the two high-voltage contact heads is converted into the elastic potential energy of the buffer spring, thereby prolonging the service life of the contact bridge. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0043] Figure 1 FIG. 1 is a perspective view of an electromagnetic drive type high-voltage contactor in the background art;

[0044] Figure 2 FIG. 2 is a perspective view of the internal structure of the electromagnetic drive type high-voltage contactor in the background art; Figure 1

[0045] Figure 3 FIG. 3 is a perspective view of the present application in Embodiment 1 and Embodiment 2;

[0046] Figure 4 FIG. 4 is a perspective view of the internal structure of the present application in Embodiment 1 and Embodiment 2; Figure 3

[0047] Figure 5 FIG. 5 is a perspective view of the internal structure of the present application in Embodiment 3.

[0048] Markings in the figure: 1 - housing; 2 - high-voltage contact head; 3 - contact bridge; 4 - piston; 5 - piston chamber; 6 - low-voltage coil; 7 - mating port; 8 - hydraulic transmission component; 9 - sealing ring; 10 - corrugated liquid capsule; 11 - connecting rod; 12 - return spring; 13 - buckle one; 14 - buckle two; 15 - buffer spring. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0050] Embodiment 1, as Figures 3-4 ​​As shown, a hydraulically operated high-voltage contactor applicable in strong magnetic environments includes a housing 1. Two high-voltage contact heads 2 are fixedly installed at the top of the housing 1. A contact bridge 3, capable of simultaneously closing or opening the two high-voltage contact heads 2, is movably installed inside the housing 1. Both the high-voltage contact heads 2 and the contact bridge 3 are conductors. A piston 4 made of non-magnetic material (such as copper) is concentrically installed below the contact bridge 3. The piston 4 is located in a piston chamber 5 inside the housing 1. A connection interface 7 is provided at the bottom of the piston chamber 5. A hydraulic transmission component 8, such as a water pump, is installed in the connection interface 7 through a threaded seal. A sealing ring 9, which seals against the side wall of the piston chamber 5, is installed on the piston 4. A sealed area is formed in the piston chamber 5 between the piston 4 and the connection interface 7. By injecting or pumping liquid into this sealed area through the hydraulic transmission component 8, the piston 4 can be controlled to move back and forth in the piston chamber 5 towards the location of the high-voltage contact heads 2, ultimately controlling the contact bridge 3 to simultaneously close or open with the two high-voltage contact heads 2. This hydraulic high-voltage contactor uses hydraulic control to open and close, and the entire control process is not affected by strong magnetic environment. There are no safety hazards such as control failure due to strong magnetic field. It has better stability and reliability in application.

[0051] The liquid injected into the sealed area formed within the piston chamber 5 by the hydraulic transmission component 8 is a coolant, such as ethylene glycol. In order to further reduce the temperature inside and around the piston chamber 5, a coolant such as ethylene glycol is used as a propellant to drive the piston, which can reduce the temperature inside and around the piston chamber 5.

[0052] like Figure 4 As shown, the contact bridge 3 and the piston 4 are concentrically connected by the thread of the connecting rod 11. The lower half of the connecting rod 11 is fitted with a return spring 12 that pushes the piston 4 toward the location of the coupling. In order to achieve automatic reset of the piston 4, when the hydraulic assembly pumps liquid, the piston 4 is pushed toward the location of the coupling by the elastic action of the return spring 12. At this time, the contact bridge 3 and the two high-voltage contact heads 2 are simultaneously disconnected, that is, the high-voltage contactor is automatically disconnected.

[0053] like Figure 4As shown, the upper half of the connecting rod 11 is concentrically clamped with buckle one 13 and buckle two 14, wherein the connecting rod 11 is sleeved with a buffer spring 15 between buckle one 13 and buckle two 14, wherein buckle one 13 and buckle two 14 are both insulators; buckle one 13 is above buckle two 14, and the contact bridge 3 is fixed on buckle one 13, wherein the buffer spring 15 pushes buckle one 13 to move towards the place where the high-voltage contact head 2 is located. In order to reduce the impact force when the contact bridge 3 contacts the two high-voltage contact heads 2, a buffer spring 15 is installed between buckle one 13 and buckle two 14, and the contact bridge 3 will compress the buffer spring 15 at the moment of contacting the two high-voltage contact heads 2, that is, the impact force generated at the moment of contacting the contact bridge 3 with the two high-voltage contact heads 2 is converted into the elastic potential energy of the buffer spring 15, thereby prolonging the service life of the contact bridge 3.

[0054] The working principle of the embodiment is as follows:

[0055] The hydraulic high-voltage contactor is applied to new energy vehicles, and the liquid force transmission component 8 connected and controlled by the car machine controls its closing and opening in a hydraulic manner. The entire control process is not affected by the strong magnetic environment, and there is no safety hazard such as control failure caused by strong magnetism. When applied, it has better stability and reliability. When applied, the liquid force transmission component 8 is connected with the liquid storage tank on one side, and when the liquid force transmission component 8 injects or extracts liquid into the sealed area, it can control the piston 4 to move back and forth in the piston chamber 5 towards the place where the high-voltage contact head 2 is located, and finally control the contact bridge 3 to close or open with the two high-voltage contact heads 2 at the same time.

[0056] Embodiment two, as shown, Figures 3-4 The difference between this embodiment and embodiment one is only that, based on embodiment one, the liquid injected into the sealed area formed by the liquid force transmission component into the piston chamber is replaced by lubricating liquid such as lubricating oil. In order to further lubricate the piston 4 and reduce the wear and corrosion of the piston 4, it uses lubricating oil as a propellant to drive the piston 4, which not only lubricates the inner wall of the piston chamber 5, but also reduces the wear and corrosion of the piston 4.

[0057] Embodiment three, as shown, Figure 5As shown, a hydraulically operated high-voltage contactor applicable in strong magnetic environments includes a housing 1. Two high-voltage contact heads 2 are fixedly installed at the top of the housing 1. A contact bridge 3, capable of simultaneously closing or opening the two high-voltage contact heads 2, is movably installed inside the housing 1. Both the high-voltage contact heads 2 and the contact bridge 3 are conductors. A piston 4, made of a non-magnetic material (such as copper), is concentrically installed below the contact bridge 3. The piston 4 is located in a piston chamber 5 inside the housing 1. A connection port 7 is provided at the bottom of the piston chamber 5. A hydraulic transmission component 8, such as an integrated injection and extraction pump, is installed in the connection port 7 through a threaded seal. A corrugated liquid bladder 16 is placed in the piston chamber 5 between the piston 4 and the connection port 7. The lower part of the corrugated liquid bladder 16 is sealed to the connection port. The interior of the corrugated liquid bladder 16 forms a sealed area. By injecting or extracting liquid into this sealed area through the hydraulic transmission component 8, the piston 4 can be controlled to move back and forth in the piston chamber 5 towards the location of the high-voltage contact heads 2, ultimately controlling the contact bridge 3 to simultaneously close or open with the two high-voltage contact heads 2. This hydraulic high-voltage contactor uses hydraulic control to open and close, and the entire control process is not affected by strong magnetic environment. There are no safety hazards such as control failure due to strong magnetic field. It has better stability and reliability in application.

[0058] The liquid injected into the sealed area formed within the corrugated liquid bladder 16 by the hydraulic transmission component 8 is coolant. In order to further reduce the temperature inside and around the corrugated liquid bladder 16, a coolant such as ethylene glycol is used as a propellant to drive the corrugated liquid bladder 16 to expand, thereby driving the piston 4 and reducing the temperature inside and around the corrugated liquid bladder 16.

[0059] like Figure 5 As shown, the contact bridge 3 and the piston 4 are concentrically connected by the thread of the connecting rod 11. The lower half of the connecting rod 11 is fitted with a return spring 12 that pushes the piston 4 toward the location of the coupling. In order to achieve automatic reset of the piston 4, when the hydraulic assembly pumps liquid, the piston 4 is pushed toward the location of the coupling by the elastic action of the return spring 12. At this time, the contact bridge 3 and the two high-voltage contact heads 2 are simultaneously disconnected, that is, the high-voltage contactor is automatically disconnected.

[0060] like Figure 5As shown, the upper half of the connecting rod 11 is concentrically clamped with buckle one 13 and buckle two 14, wherein the connecting rod 11 is sleeved with a buffer spring 15 between the buckle one 13 and the buckle two 14, wherein the buckle one 13 and the buckle two 14 are both insulators; the buckle one 13 is above the buckle two 14, and the contact bridge 3 is fixed on the buckle one 13, wherein the buffer spring 15 pushes the buckle one 13 to move towards the place where the high-voltage contact head 2 is located. In order to reduce the impact force when the contact bridge 3 contacts with the two high-voltage contact heads 2, the buffer spring 15 is installed between the buckle one 13 and the buckle two 14, and the contact bridge 3 contacts with the two high-voltage contact heads 2 at the moment, which will compress the buffer spring 15, that is, the impact force generated at the moment when the contact bridge 3 contacts with the two high-voltage contact heads 2 is converted into the elastic potential energy of the buffer spring 15, thereby prolonging the service life of the contact bridge 3.

[0061] The working principle of the embodiment is as follows:

[0062] The hydraulic high-voltage contactor is applied to a new energy vehicle, and the liquid force transmission component 8 connected and controlled by the vehicle machine controls its closing and opening in a hydraulic manner, the whole control process is not affected by a strong magnetic environment, and there is no safety hazard such as control failure caused by strong magnetism, and the application has better stability and reliability. In application, the liquid force transmission component 8 is connected with a liquid storage tank, and when the liquid force transmission component 8 injects or extracts liquid into the corrugated liquid bag 16, it can control the piston 4 to move back and forth in the piston chamber 5 towards the place where the high-voltage contact head 2 is located, and finally control the contact bridge 3 to close or open with the two high-voltage contact heads 2 at the same time.

[0063] The above is only a preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A liquid-driven high-voltage contactor applicable in a strong magnetic environment, comprising a shell (1); Two high-voltage contact heads (2) are fixedly installed at the top end of the shell (1), and a contact bridge (3) capable of simultaneously closing or disconnecting the two high-voltage contact heads (2) is movably installed inside the shell (1); characterized in that A non-magnetic material piston (4) is concentrically installed below the contact bridge (3), and the piston (4) is located in a piston chamber (5) inside the shell (1); A docking port (7) is formed at the bottom of the piston chamber (5), and a hydraulic transmission component (8) is sealingly installed in the docking port (7); a sealing ring (9) is limitingly installed on the piston (4) and sealingly abuts against the sidewall of the piston chamber (5); A sealed area is formed in the piston chamber (5) between the piston (4) and the docking port (7), and by injecting or pumping liquid into the sealed area through the hydraulic transmission component (8), the piston (4) can be controlled to move back and forth in the piston chamber (5) towards the high-voltage contact heads (2), so as to finally control the contact bridge (3) to simultaneously close or disconnect the two high-voltage contact heads (2).

2. The hydraulic high-voltage contactor applicable in a strong magnetic environment according to claim 1, characterized in that: The liquid injected into the sealed area in the piston chamber (5) by the hydraulic transmission component (8) is cooling liquid.

3. The hydraulic high-voltage contactor applicable in a strong magnetic environment according to claim 2, characterized in that: The liquid injected into the sealed area in the piston chamber (5) by the hydraulic transmission component (8) is lubricating liquid.

4. The hydraulic high-voltage contactor applicable in a strong magnetic environment according to claim 3, characterized in that: The contact bridge (3) and the piston (4) are concentrically docked through a connecting rod (11), and the lower half of the connecting rod (11) is sleeved with a return spring (12) for pushing the piston (4) to move towards the docking port.

5. The hydraulic high-voltage contactor applicable in a strong magnetic environment according to claim 4, characterized in that: The upper half of the connecting rod (11) is concentrically docked with a buckle one (13) and a buckle two (14), and the connecting rod (11) is sleeved with a buffer spring (15) between the buckle one (13) and the buckle two (14); The buckle one (13) is located above the buckle two (14), and the contact bridge (3) is fixed on the buckle one (13), wherein the buffer spring (15) pushes the buckle one (13) to move towards the high-voltage contact heads (2).

6. A liquid-driven high-voltage contactor applicable in a strong magnetic environment, comprising a shell (1); Two high-voltage contact heads (2) are fixedly installed at the top end of the shell (1), and a contact bridge (3) capable of simultaneously closing or disconnecting the two high-voltage contact heads (2) is movably installed inside the shell (1); characterized in that A non-magnetic material piston (4) is concentrically installed below the contact bridge (3), and the piston (4) is located in a piston chamber (5) inside the shell (1); A docking port (7) is formed at the bottom of the piston chamber (5), and a hydraulic transmission component (8) is sealingly installed in the docking port (7); A corrugated liquid bag (10) is placed in the piston chamber (5) between the piston (4) and the docking port (7), and the lower part of the corrugated liquid bag (10) is sealingly docked with the docking port; The inside of the corrugated liquid bag (10) forms a sealed area, and the injection or extraction of liquid into the sealed area through the hydraulic transmission component (8) can control the piston (4) to move back and forth in the piston chamber (5) to the place where the high-pressure contact head (2) is located, and finally control the contact bridge (3) to close or open the two high-pressure contact heads (2) at the same time.

7. The hydraulic high voltage contactor applicable in strong magnetic environment according to claim 6, characterized in that: The liquid injected into the sealed area of the corrugated liquid bag (10) by the hydraulic transmission component (8) is cooling liquid.

8. The hydraulic high-voltage contactor applicable in a strong magnetic environment according to claim 7, characterized in that: The contact bridge (3) and the piston (4) are concentrically connected through the connecting rod (11), and the lower half of the connecting rod (11) is sleeved with a reset spring (12) for pushing the piston (4) to move to the place where the connecting head is located.

9. The hydraulic high voltage contactor applicable in a strong magnetic environment according to claim 8, characterized in that: The upper half of the connecting rod (11) is concentrically connected with buckle one (13) and buckle two (14), and the connecting rod (11) is sleeved with a buffer spring (15) between buckle one (13) and buckle two (14). The buckle one (13) is located above the buckle two (14), and the contact bridge (3) is fixed on the buckle one (13), and the buffer spring (15) pushes the buckle one (13) to move to the place where the high-pressure contact head (2) is located.

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