Structure capable of generating self-thrust force, circuit breaker, isolation switch, load switch and grounding switch

Abstract

The invention belongs to the field of power transmission and distribution, and discloses a structure capable of generating self-thrust, a circuit breaker, an isolating switch, a load switch and a grounding switch, the self-thrust structure comprises a shell, a first air inflation chamber and an air cylinder barrel are arranged in the shell, a piston is installed in the first air inflation chamber and movably connected with the air cylinder barrel, the piston is provided with a nozzle, and a pull rod is movably installed in the center of the air cylinder barrel. And the pull rod is fixedly connected with the piston, the direction of pulling the pull rod is used as an opening direction, and the direction of pushing the pull rod is used as a closing direction. The boosting air chamber is arranged, so that air generated by electric arcs is fully utilized to push the partition plate B to move, the pull rod is driven to move, finally the piston is pushed to move, the pressure difference between the compression air chamber and the first inflation chamber is counteracted, the requirement for operating work of an external operating mechanism is lowered, and meanwhile the problem that when large current is cut off, the pressure difference is too large can be solved. Therefore, the problem of stagnation and even rebound caused by insufficient operation work can be solved, and the success of on-off can be ensured.

Description

Technical Field

[0001] The invention belongs to the field of power transmission and distribution, and in particular relates to a structure capable of generating self-thrusting force, a circuit breaker, a disconnecting switch, a load switch and a grounding switch. Background Art

[0002] Gas circuit breakers are the main switching devices in the field of power transmission and distribution, responsible for carrying current and cutting off fault current.

[0003] Gas circuit breaker is one of the important types of high-voltage circuit breakers. The main types are compressed gas circuit breakers and self-energized circuit breakers. The compressed gas circuit breaker has the advantages of large breaking capacity and simple working principle. When the self-energized circuit breaker breaks large current, the heat of the arc itself is used to heat the pressure of the gas inside the expansion chamber, thereby reaching the gas pressure required for arc extinguishing. When breaking small current, the compressed gas function is directly used to establish high voltage, thereby extinguishing the arc.

[0004] However, conventional compressed air circuit breakers have large compressed air resistance and must be equipped with an operating mechanism with large operating power. In particular, when breaking large currents, the movement may stagnate or even rebound due to insufficient operating power. Although self-energized circuit breakers have relatively small operating power, their design principles are complex and their maximum breaking capacity is difficult to increase. Therefore, they cannot replace compressed air circuit breakers. Summary of the invention

[0005] In view of the problem of high pneumatic resistance of existing compressed air circuit breakers, the present invention provides a structure, a circuit breaker, a disconnector, a load switch and a grounding switch that can generate self-thrust force. Specifically, a booster air chamber is designed, and the gas generated by the electric arc can be introduced into the booster air chamber to assist the movement of the thrust piston, thereby effectively reducing the operating power requirement of the circuit breaker.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A structure capable of generating self-thrusting force comprises a shell, a first air-filled chamber is provided in the shell, a cylinder is installed in the first air-filled chamber, a piston is movably connected to the cylinder, the piston has a nozzle, a pull rod is movably installed in the center of the cylinder and fixedly connected to the piston, and the direction of pulling the pull rod is used as the opening direction, and the direction of pushing the pull rod is used as the closing direction, a static arc contact is installed on the shell through a static arc contact seat and is located on the central axis of the nozzle, a moving arc contact, one end of which is fixedly connected to the pull rod and corresponds to the static arc contact, a partition A is fixedly installed in the cylinder and is in sliding electrical contact with the pull rod, and a compression chamber is formed by the pull rod, the cylinder, the piston and the partition A; and also comprises,

[0008] The partition B is fixedly mounted on the pull rod and is slidably connected with the cylinder barrel.

[0009] The booster air chamber is formed by the pull rod, the cylinder barrel, the partition A and the partition B, and is located near the compression air chamber.

[0010] The channel is provided in the pull rod and the moving arc contact and is open along one end of the moving arc contact. When the static arc contact is separated from the moving arc contact, the channel is connected with the booster air chamber, the compression air chamber and the nozzle.

[0011] When the short-circuit current is interrupted, the movement of the pull rod pulling the piston causes the compressed air chamber to generate high-pressure gas and flow to the nozzle to blow out the arc; the first inflation chamber is filled with a predetermined gas, and the first inflation chamber has a first inflation pressure. The gas high pressure in the compressed air chamber is greater than the first inflation pressure, and the gas generated by the arc enters the booster air chamber through the channel, thereby increasing the gas pressure in the booster air chamber. The air pressure in the booster air chamber pushes the partition B to move in the direction of the opening switch, thereby finally causing the pull rod to pull the piston to move in the direction of the opening switch until the opening switch operation is completed.

[0012] Preferably, a pressure relief hole is provided on the cylinder barrel, and the pressure relief hole is respectively connected to the booster air chamber and the first inflation chamber, so as to allow the high-pressure gas in the booster air chamber to flow out through the pressure relief hole, thereby reducing the piston thrust and achieving deceleration when the piston moves in the direction of opening the gate.

[0013] Furthermore, the cylinder barrel has a second air-filled chamber located near the booster air chamber. When the partition B moves on the cylinder barrel in the 0-front 2 / 3 stroke in the direction of the gate opening, the pressure relief hole is blocked from the booster air chamber and the first air-filled chamber by the partition B, and is connected to the first air-filled chamber and the second air-filled chamber.

[0014] When the partition B is in the last 1 / 3 of the stroke on the cylinder barrel in the direction of opening the gate, the pressure relief hole is connected with the booster air chamber and the first inflation chamber, and is blocked from the first inflation chamber and the second inflation chamber by the partition B.

[0015] Preferably, the second inflation chamber is separated from the booster air chamber by a partition B.

[0016] Preferably, the cylinder barrel is sleeved on the piston via a sliding guide.

[0017] Preferably, the piston is sleeved on the cylinder barrel via a sliding guide.

[0018] Preferably, when the short-circuit current is interrupted, the high pressure generated by the gas in the compressed gas chamber is 0.1-10 MPa and the temperature is 300-2000K, the gas temperature in the channel is 300K-20000K, the pressure is 1-20 MPa, and the pressure in the first and second inflatable chambers is 0.1-5 MPa and the temperature is 300-500K;

[0019] The inflatable gas in the first inflatable chamber, the second inflatable chamber, the compressed air chamber and the booster air chamber is SF 6 , CO 2 、N 2 CF 4 、C4-FN、C5-FK、CF 3 One or more of I.

[0020] Preferably, the partition A is connected to the pull rod via a sliding electrical contact to achieve electrical connection.

[0021] Preferably, pressure valves are provided on both the partition A and the partition B, wherein one pressure valve connects or blocks the booster air chamber and the compression air chamber, and the other pressure valve connects or blocks the booster air chamber and the second inflation chamber.

[0022] Preferably, a one-way valve is arranged on the piston, the one-way valve is communicated with the compressed air chamber and the inflation chamber respectively, and the air flow direction is from the inflation chamber to the compressed air chamber.

[0023] Preferably, the operating work done by the self-propulsion structure is mainly as follows:

[0024] (1) When the travel from closing to opening, the tension of the pull rod is calculated as follows:

[0025] F 拉 =(P 1 -P 2 )·A;

[0026] Among them: F 拉 P is the pulling force of the pull rod when the piston moves toward the opening gate. 1 is the gas pressure in the compressed air chamber, P 2 is the gas pressure in the booster chamber, A is the axial area of ​​the cylinder barrel or piston;

[0027] When the travel from opening to closing, the thrust calculation formula of the pull rod is as follows:

[0028] F 推 =(P 2 -P 1 )·A

[0029] Among them: F 推 P is the thrust of the pull rod when the piston moves toward closing. 1 is the gas pressure in the compressed air chamber, P 2 is the gas pressure in the booster chamber, A is the axial area of ​​the cylinder barrel or piston;

[0030] Therefore, when the pull rod is pulled, that is, from closing to opening, the calculation formula of the operating work is as follows:

[0031] W拉 =F 拉 ·S;

[0032] Among them, W 拉 is the operating work when pulling the pull rod, F 拉 is the pulling force when pulling the rod, S is the stroke of the piston;

[0033] (2) When the pull rod is pushed, that is, from opening to closing, the calculation formula for the operating work is as follows:

[0034] W 推 =F 推 ·S;

[0035] Among them, W 推 F is the operating work when pushing the pull rod, 推 is the thrust when pushing the pull rod, and S is the stroke of the piston.

[0036] A circuit breaker comprises an operating mechanism and the self-thrusting structure described above,

[0037] The operating mechanism is connected to the other end of the pull rod, and during the gate opening process, the self-thrusting structure moves in the gate opening direction under the traction of the operating mechanism;

[0038] During the closing process, the self-propulsion structure moves in the closing direction under the traction of the above-mentioned operating mechanism.

[0039] Preferably, during the closing process, the self-propulsion structure is pulled by the operating mechanism, and the compressed air chamber opens the one-way valve due to the negative pressure to obtain gas replenishment.

[0040] A disconnector comprises an operating mechanism and the self-propulsion structure described above,

[0041] The operating mechanism is connected to the other end of the pull rod, and during the gate opening process, the self-thrusting structure moves in the gate opening direction under the traction of the operating mechanism;

[0042] During the closing process, the self-propulsion structure moves in the closing direction under the traction of the above-mentioned operating mechanism.

[0043] Preferably, during the closing process, the self-propulsion structure is pulled by the operating mechanism, and the compressed air chamber opens the one-way valve due to the negative pressure to obtain gas replenishment.

[0044] A load switch comprises an operating mechanism and the self-propulsion structure described above,

[0045] The operating mechanism is connected to the other end of the pull rod, and during the gate opening process, the self-thrusting structure moves in the gate opening direction under the traction of the operating mechanism;

[0046] During the closing process, the self-propulsion structure moves in the closing direction under the traction of the above-mentioned operating mechanism.

[0047] Preferably, during the closing process, the self-propulsion structure is pulled by the operating mechanism, and the compressed air chamber opens the one-way valve due to the negative pressure to obtain gas replenishment.

[0048] A grounding switch comprises an operating mechanism and the self-propulsion structure described above,

[0049] The operating mechanism is connected to the other end of the pull rod, and during the gate opening process, the self-thrusting structure moves in the gate opening direction under the traction of the operating mechanism;

[0050] During the closing process, the self-propulsion structure moves in the closing direction under the traction of the above-mentioned operating mechanism.

[0051] Preferably, during the closing process, the self-propulsion structure is pulled by the operating mechanism, and the compressed air chamber opens the one-way valve due to the negative pressure to obtain gas replenishment.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] 1. The self-propulsion structure of the present invention comprises a housing having a first air-filled chamber in the housing, a cylinder barrel installed in the first air-filled chamber, a piston movably connected to the cylinder barrel, the piston having a nozzle, a pull rod movably installed in the center of the cylinder barrel and fixedly connected to the piston, and the direction of pulling the pull rod is used as the opening direction, and the direction of pushing the pull rod is used as the closing direction, a static arc contact is installed on the housing through a static arc contact seat and is located on the central axis of the nozzle, and a moving arc contact, one end of which is fixed to the pull rod The cylinder barrel is connected and corresponds to the static arc contact. The partition A is fixedly installed in the cylinder barrel and is in sliding electrical contact with the pull rod. The compression air chamber is surrounded by the pull rod, the cylinder barrel, the piston, and the partition A; it also includes a partition B, which is fixedly installed on the pull rod and is slidably connected to the cylinder barrel. The booster air chamber is surrounded by the pull rod, the cylinder barrel, the partition A and the partition B, and is located near the compression air chamber. The channel is opened in the pull rod and the moving arc contact, and is open along one end of the moving arc contact. When the static arc contact is separated from the moving arc contact When the short-circuit current is interrupted, the movement of the piston pulled by the pull rod causes the compressed air chamber to generate high-pressure gas and flow to the nozzle to blow out the arc; the first inflation chamber is filled with a predetermined gas, and the first inflation chamber has a first inflation pressure. The gas high pressure in the compressed air chamber is greater than the first inflation pressure, and the gas generated by the arc enters the booster air chamber through the channel, so that the gas pressure in the booster air chamber increases, and the gas pressure in the booster air chamber pushes the partition B to move in the direction of the opening switch, thereby finally causing the pull rod to pull the piston to move in the direction of the opening switch until the opening switch operation is completed; the booster air chamber is provided in the present invention, the purpose of which is to make full use of the gas generated by the arc to push the partition B to move, thereby driving the pull rod to move, and finally pushing the piston to move, so as to offset the pressure difference between the compressed air chamber and the first inflation chamber, thereby reducing the demand for the operating work of the external operating mechanism, and at the same time, it can eliminate the problem of stagnation or even rebound caused by insufficient operating work when breaking a large current, thereby ensuring the success of the breaking.

[0054] 2. Because the self-propulsion structure in the present invention also includes a pull rod, which is arranged in the axial direction and one end of which is connected to the moving arc contact, the booster air chamber is surrounded by the pull rod, the cylinder barrel, the partition A and the partition B, and the compression air chamber is surrounded by the pull rod, the cylinder barrel, the piston, the partition A and the moving arc contact. Therefore, compared with the self-energy circuit breaker in the prior art, the self-propulsion structure has a simple structure, a simple design principle and is easy to operate.

[0055] 3. Because a pressure valve is arranged between the two partitions in the present invention, one pressure valve connects or blocks the booster air chamber and the compression air chamber, and the other pressure valve connects or blocks the booster air chamber and the second inflation chamber, thereby adjusting the internal pressure of the compression air chamber and the booster air chamber.

[0056] 4. Because the cylinder barrel in the present invention is provided with a pressure relief hole, the pressure relief hole is respectively connected with the booster air chamber and the first inflation chamber, specifically: there is a second inflation chamber in the cylinder barrel, which is located near the booster air chamber. When the partition B moves on the cylinder barrel in the 0-front 2 / 3 stroke in the direction of the opening gate, the pressure relief hole is blocked by the partition B from the booster air chamber and the first inflation chamber, and is connected with the first inflation chamber and the second inflation chamber; when the partition B is in the last 1 / 3 stroke in the direction of the opening gate on the cylinder barrel, the pressure relief hole is connected with the booster air chamber and the first inflation chamber, and is blocked by the partition B from the first inflation chamber and the second inflation chamber; the purpose is to allow the high-pressure gas in the booster air chamber to flow out through the pressure relief hole, thereby reducing the piston thrust and achieving deceleration when the piston moves in the direction of the opening gate.

[0057] 5. Because a one-way valve is provided on the piston in the present invention, the one-way valve is respectively connected to the compressed air chamber and the first inflation chamber, and the inflation direction is from the first inflation chamber to the compressed air chamber. The purpose is that due to the negative pressure in the compressed air chamber, the one-way valve can be opened to obtain gas replenishment.

[0058] 6. The self-propulsion structure of the present invention meets the following requirements:

[0059] When the travel from closing to opening, the tension of the pull rod is calculated as follows:

[0060] F 拉 =(P 1 -P 2 )·A;

[0061] Among them: F 拉 P is the pulling force of the pull rod when the piston moves toward the opening gate. 1 is the gas pressure in the compressed air chamber, P 2 is the gas pressure in the booster chamber, A is the axial area of ​​the cylinder barrel or piston;

[0062] When the travel from opening to closing, the thrust calculation formula of the pull rod is as follows:

[0063] F 推 =(P 2 -P 1 )·A

[0064] Among them: F 推 P is the thrust of the pull rod when the piston moves toward closing. 1 is the gas pressure in the compressed air chamber, P 2 is the gas pressure in the booster chamber, A is the axial area of ​​the cylinder barrel or piston;

[0065] Therefore, when the pull rod is pulled, that is, from closing to opening, the calculation formula of the operating work is as follows:

[0066] W 拉 =F拉 ·S;

[0067] Among them, W 拉 is the operating work when pulling the pull rod, F 拉 is the pulling force when pulling the rod, S is the stroke of the piston;

[0068] When the pull rod is pushed, that is, from opening to closing, the calculation formula of the operating work is as follows:

[0069] W 推 =F 推 ·S;

[0070] Among them, W 推 F is the operating work when pushing the pull rod, 推 is the thrust when pushing the pull rod, and S is the stroke of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 This is a schematic diagram of the state of the embodiment 1 of the present invention when the moving arc contact and the static contact are closed;

[0072] Figure 2 This is a schematic diagram of the state of the embodiment 1 of the present invention when the moving arc contact and the static contact are open;

[0073] Figure 3 This is a schematic diagram of the state of the embodiment 2 of the present invention when the moving arc contact and the static contact are closed;

[0074] Figure 4 This is a schematic diagram of the state of the embodiment 2 of the present invention when the moving arc contact and the static contact are open;

[0075] Figure 5 It is a structural schematic diagram of the sliding guide member in the present invention;

[0076] Figure 6 It is a schematic diagram of the gas pressure of each gas chamber and the force of the pull rod or piston when the switch is closed or opened in the present invention;

[0077] In the figure: cylinder barrel 1, piston 2, nozzle 3, moving arc contact 4, static contact 5, compression air chamber 6, booster air chamber 7, channel 8, pull rod 9, partition A10, pressure valve 11, pressure relief hole 12, one-way valve 13, sliding guide 14, air guide cone 15, first inflation air chamber 16, connecting plate 17, second inflation air chamber 18, partition B19, sliding electrical contact 20, static arc contact seat 21, shell 22, insulating isolation 23. DETAILED DESCRIPTION

[0078] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is specifically described in the following embodiments in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0079] Example 1

[0080] like Figure 1-2 As shown, a structure capable of generating self-propulsion comprises:

[0081] The housing 22 has a first air-filled chamber 16 therein.

[0082] The cylinder barrel 1 is installed in the first inflation chamber 16.

[0083] The piston 2 is movably mounted on the cylinder barrel 1. Specifically, the cylinder barrel 1 is slidably mounted on the piston 2 through a sliding guide 14. The piston 2 has a nozzle 3, which opens along the closing direction.

[0084] The pull rod 9 is movably mounted at the center of the cylinder 1 and fixedly connected to the piston 2. Specifically, the pull rod 9 is connected to the piston 2 via a connecting plate 17, and the direction of pulling the pull rod 9 is used as the opening direction, and the direction of pushing the pull rod 9 is used as the closing direction.

[0085] The static arc contact 5 is mounted on the housing 22 through the static arc contact seat 21. Specifically, the static arc contact seat 21 is mounted on the housing 22, and the static arc contact 5 is mounted on the static arc contact 21; and an insulating isolation member 23 is provided between the static arc contact seat 21 and the housing 22. The static arc contact 5 is located on the central axis of the nozzle 3.

[0086] The moving arc contact 4 has one end fixedly connected to the pull rod 9 and corresponds to the stationary arc contact 5.

[0087] The compressed air chamber 6 is formed by the pull rod 9, the cylinder barrel 1, the piston 2, the partition A10 and the moving arc contact 4, and an opening is provided on the connecting plate 17 to connect the compressed air chamber 6 with the nozzle 3. The partition A10 and the pull rod 9 are connected by a sliding electrical contact 20 (specifically, the sliding electrical contact 20 is a sliding contact finger (such as Figure 5 The contact finger of the watch strap is slidably connected and electrically contacted;

[0088] The booster chamber 7 is formed by the pull rod 9, the cylinder barrel 4, the partition A10 and the partition B19; and is located near the compression chamber 6. The partition B19 is slidably connected to the cylinder barrel 1 through a sliding guide 14;

[0089] The channel 8 is provided in the pull rod 9 and the moving arc contact 4 and is open along one end of the moving arc contact 4. When the static arc contact 5 is separated from the moving arc contact 4, i.e. when the switch is opened, Figure 2As shown, at this time, the channel 8 is connected with the booster air chamber 7, the compression air chamber 6 and the nozzle 3. (It should be noted that, as shown in FIG. Figure 1 As shown, when the circuit breaker is closed, the static arc contact 5 blocks the open part of the moving arc contact 4); specifically, the pull rod 9 is also provided with a pressure relief hole 12, and the pressure relief hole 12 on the pull rod 9 is connected with the channel 8 and the compressed air chamber 7 (in this embodiment, the pull rod 9 and the moving arc contact 4 and the static arc contact 5 are all in the same horizontal plane);

[0090] When the short-circuit current is interrupted, the pull rod 9 pulls the piston 2 to generate high-pressure gas with a temperature of 300-2000K and a pressure of 0.1-10Mpa in the gas in the compressed air chamber 6, which flows to the nozzle 3 to blow out the arc. The first inflation chamber 16 is filled with a predetermined gas, and the first inflation chamber 16 has a first inflation pressure. The high pressure of the gas in the compressed air chamber 6 is greater than the first inflation pressure, and the gas with a temperature of 300K-20000K and a pressure of 1MPa-20MPa generated by the arc enters the booster air chamber 7 through the channel 8, increasing the gas pressure in the booster air chamber 7. The gas pressure in the booster air chamber 7 pushes the partition B19 to move in the direction of the opening gate, thereby finally causing the pull rod 9 to pull the piston 2 to move in the direction of the opening gate until the opening gate operation is completed;

[0091] A second air-filling chamber 18 is also provided inside the cylinder barrel 1. The second air-filling chamber 18 is located near the booster air chamber 7. The two are separated by a partition B19. The gas pressure of the second air-filling chamber 18 is the same as the pressure of the first air-filling chamber 16, but both are less than the pressure of the compression air chamber.

[0092] The pressure valve 11 is arranged on both the partition A10 and the partition B19. The pressure valve 11 on the partition A10 connects or blocks the booster air chamber 7 and the compression air chamber 6, so as to adjust the internal pressure of the compression air chamber 6 and the booster air chamber 7. The pressure valve 11 on the partition B19 connects or blocks the booster air chamber 7 and the second inflation chamber 18, so as to adjust the pressure in the booster air chamber 7 and the second inflation chamber 18.

[0093] A pressure relief hole 12 is provided on the cylinder barrel 1, and the pressure relief hole 12 is respectively connected with the booster chamber 7 and the first inflation chamber 16, so as to allow the high-pressure gas in the booster chamber 7 to flow out through the pressure relief hole 12, thereby reducing the thrust of the piston 2 and achieving deceleration when the piston 2 moves in the direction of the opening of the gate. Specifically, when the partition plate B19 moves in the 0-front 2 / 3 stroke in the direction of the opening of the gate on the cylinder barrel 1, the pressure relief hole 12 is blocked from the booster chamber 7 and the first inflation chamber 16 by the partition plate B19, and is connected with the first inflation chamber 16 and the second inflation chamber 18;

[0094] When the partition plate B19 is in the last 1 / 3 stroke on the cylinder barrel 1 in the direction of the gate opening, the pressure relief hole 12 is connected with the booster air chamber 7 and the first air-filling chamber 16, and is blocked from the first air-filling chamber 16 and the second air-filling chamber 18 by the partition plate B19;

[0095] A one-way valve 13 is provided on the piston 2 , and the one-way valve 13 is respectively connected to the compressed air chamber 6 and the first inflation chamber 16 , and the inflation direction is from the first inflation chamber 16 to the compressed air chamber 6 .

[0096] It should also be noted that a main contact (not shown in the figure) is also arranged in the first inflation chamber 16 , and the piston 2 is located between the main contact and the cylinder barrel 1 .

[0097] The operating work done by this self-thrusting structure is mainly as follows:

[0098] (1) When the travel from closing to opening, the tension of the pull rod is calculated as follows:

[0099] F 拉 =(P 1 -P 2 )·A;

[0100] Among them: F 拉 P is the pulling force of the pull rod when the piston moves toward the opening gate. 1 is the gas pressure in the compressed air chamber, P 2 is the gas pressure in the booster chamber, A is the axial area of ​​the cylinder barrel or piston;

[0101] Therefore, when the pull rod is pulled, that is, from closing to opening, the calculation formula of the operating work is as follows:

[0102] W 拉 =F 拉 ·S;

[0103] Among them, W 拉 is the operating work when pulling the pull rod, F 拉 is the pulling force when pulling the rod, S is the stroke of the piston;

[0104] (2) When the travel from opening to closing, the thrust calculation formula of the pull rod is as follows:

[0105] F 推 =(P 2 -P 1 )·A

[0106] Among them: F 推 P is the thrust of the pull rod when the piston moves toward closing. 1 is the gas pressure in the compressed air chamber, P 2 is the gas pressure in the booster chamber, A is the axial area of ​​the cylinder barrel or piston;

[0107] When the pull rod is pushed, that is, from opening to closing, the calculation formula of the operating work is as follows:

[0108] W 推 =F 推 ·S;

[0109] Among them, W 推 is the operating work when pushing the pull rod, F 推 is the thrust when pushing the pull rod, and S is the stroke of the piston.

[0110] It should be noted that

[0111] (1) In this embodiment, the pressure on each air chamber, the pulling force when the piston moves in the direction of opening the gate, and the forces on the pull rod (referred to as the force-bearing member A) and the piston 2 (referred to as the force-bearing member B) are respectively as follows: Figure 6 As shown:

[0112] F 拉 =F A +F B ;

[0113] F A =(P 3 -P 2 )·A;

[0114] F B =(P 1 -P 3 )·A;

[0115] to this end,

[0116] F 拉 =(P 1 -P 2 )·A.

[0117] Among them: F 拉 is the pulling force of the pull rod when the piston moves toward the opening gate, A is the axial area of ​​the cylinder or piston, and F A is the tension of the rod, F B is the pulling force of the piston, P 3 is the gas pressure of the first or second air-filled chamber, P 2 is the gas pressure in the booster chamber, P 1 is the gas pressure in the compression chamber;

[0118] (2) In this embodiment, the pressure of each air chamber, the thrust of the piston when it moves in the closing direction, and the forces on the pull rod (referred to as the force-bearing member A) and the piston 2 (referred to as the force-bearing member B) are respectively as follows: Figure 6 As shown:

[0119] F 推 =F A+F B ;

[0120] F A =(P 2 -P 3 )·A;

[0121] F B =(P 3 -P 1 )·A;

[0122] to this end,

[0123] F 推 =(P 2 -P 1 )·A.

[0124] Among them, F 推 is the pulling force of the pull rod when the piston moves toward the opening gate, A is the axial area of ​​the cylinder or piston, and F A is the tension of the rod, F B is the pulling force of the piston, P 3 is the gas pressure of the first or second air-filled chamber, P 2 is the gas pressure in the booster chamber, P 1 is the gas pressure in the compression chamber;

[0125] It should be noted here that an arc will be generated between the moving arc contact 4 and the static arc contact 5 just before closing the circuit breaker, but this stage is very short (generally 0-5ms). Therefore, the gas pressure generated by the closing arc is very small, and the impact on the closing pneumatic resistance can be ignored.

[0126] Example 2

[0127] This embodiment is basically the same as the embodiment 1, except that the cylinder barrel 1 in this embodiment is sleeved on the piston 2 via a sliding guide 14 (such as Figure 3-4 shown).

[0128] Example 3

[0129] A circuit breaker comprises an operating mechanism and the self-thrusting structure in Embodiment 1 or Embodiment 2,

[0130] The operating mechanism is connected to the other end of the pull rod 9. During the opening process, the self-thrusting structure moves in the opening direction under the traction of the operating mechanism.

[0131] During the closing process, the self-thrusting structure moves in the closing direction under the traction of the above-mentioned operating mechanism;

[0132] In addition, during the closing process, the self-thrusting structure is pulled by the above-mentioned operating mechanism, and the compressed air chamber 6 opens the one-way valve 13 due to the negative pressure to obtain gas replenishment.

[0133] Example 4

[0134] A disconnector comprises an operating mechanism and the self-propulsion structure of embodiment 1 or embodiment 2,

[0135] The operating mechanism is connected to the other end of the pull rod 9. During the opening process, the self-thrusting structure moves in the opening direction under the traction of the operating mechanism.

[0136] During the closing process, the self-thrusting structure moves in the closing direction under the traction of the above-mentioned operating mechanism;

[0137] In addition, during the closing process, the self-thrusting structure is pulled by the above-mentioned operating mechanism, and the compressed air chamber 6 opens the one-way valve 13 due to the negative pressure to obtain gas replenishment.

[0138] Example 5

[0139] A load switch, comprising an operating mechanism and the self-propulsion structure of embodiment 1 or embodiment 2,

[0140] The operating mechanism is connected to the other end of the pull rod 9. During the opening process, the self-thrusting structure moves in the opening direction under the traction of the operating mechanism.

[0141] During the closing process, the self-thrusting structure moves in the closing direction under the traction of the above-mentioned operating mechanism;

[0142] In addition, during the closing process, the self-thrusting structure is pulled by the above-mentioned operating mechanism, and the compressed air chamber 6 opens the one-way valve 13 due to the negative pressure to obtain gas replenishment.

[0143] Example 6

[0144] A grounding switch comprises an operating mechanism and the self-propulsion structure of embodiment 1 or embodiment 2,

[0145] The operating mechanism is connected to the other end of the pull rod 9. During the opening process, the self-thrusting structure moves in the opening direction under the traction of the operating mechanism.

[0146] During the closing process, the self-thrusting structure moves in the closing direction under the traction of the above-mentioned operating mechanism;

[0147] In addition, during the closing process, the self-thrusting structure is pulled by the above-mentioned operating mechanism, and the compressed air chamber 6 opens the one-way valve 13 due to the negative pressure to obtain gas replenishment.

[0148] The above-mentioned implementation modes are preferred cases of the present invention and are not used to limit the protection scope of the present invention. Various deformations or modifications that can be made by ordinary technicians in this field without creative work within the scope of the attached claims are still within the protection scope of this patent.

Claims

1. A structure capable of generating self-propulsion, comprising: A shell, wherein there is a first air-filled chamber in the shell, a cylinder barrel, which is installed in the first air-filled chamber, a piston, which is movably connected to the cylinder barrel, and the piston has a nozzle, a pull rod, which is movably installed in the center of the cylinder barrel and fixedly connected to the piston, and the direction of pulling the pull rod is used as the opening direction, and the direction of pushing the pull rod is used as the closing direction, a static arc contact, which is installed on the shell through a static arc contact seat and is located on the central axis of the nozzle, a moving arc contact, one end of which is fixedly connected to the pull rod and corresponds to the static arc contact, a partition A, which is fixedly installed in the cylinder barrel and is in sliding electrical contact with the pull rod, and a compression air chamber, which is surrounded by the pull rod, the cylinder barrel, the piston, and the partition A; characterized in that: Also includes, The partition B is fixedly mounted on the pull rod and is slidably connected with the cylinder barrel. The booster air chamber is formed by the pull rod, the cylinder barrel, the partition A and the partition B, and is located near the compression air chamber. The channel is provided in the pull rod and the moving arc contact and is open along one end of the moving arc contact. When the static arc contact is separated from the moving arc contact, the channel is connected with the booster air chamber, the compression air chamber and the nozzle. When the short-circuit current is interrupted, the movement of the pull rod pulling the piston causes the compressed air chamber to generate high-pressure gas and flow to the nozzle to blow out the arc; the first inflation chamber is filled with a predetermined gas, and the first inflation chamber has a first inflation pressure. The gas high pressure in the compressed air chamber is greater than the first inflation pressure, and the gas generated by the arc enters the booster air chamber through the channel, thereby increasing the gas pressure in the booster air chamber. The air pressure in the booster air chamber pushes the partition B to move in the direction of the opening gate, thereby finally causing the pull rod to pull the piston to move in the direction of the opening gate until the opening gate operation is completed.

2. A self-propulsion structure according to claim 1, characterized in that: The cylinder barrel is provided with a pressure relief hole, which is respectively connected to the booster air chamber and the first inflation chamber, and is used for the high-pressure gas in the booster air chamber to flow out through the pressure relief hole, thereby reducing the piston thrust and achieving deceleration when the piston moves in the direction of opening the gate.

3. A self-propulsion structure according to claim 2, characterized in that: The cylinder barrel has a second air-filled chamber located near the booster chamber. When the partition B moves on the cylinder barrel in the 0-front 2 / 3 stroke in the direction of the gate opening, the pressure relief hole is blocked from the booster chamber and the first air-filled chamber by the partition B, and is connected to the first air-filled chamber and the second air-filled chamber. When the partition B is in the last 1 / 3 of the stroke on the cylinder barrel in the direction of opening the gate, the pressure relief hole is connected with the booster air chamber and the first inflation chamber, and is blocked from the first inflation chamber and the second inflation chamber by the partition B.

4. The structure capable of generating self-propulsion according to claim 1, characterized in that: The cylinder barrel is sleeved on the piston through a sliding guide.

5. The self-propulsion generating structure according to claim 1, characterized in that: The piston is sleeved on the cylinder barrel through a sliding guide.

6. The self-propulsion generating structure according to claim 3, characterized in that: When the short-circuit current is interrupted, the high pressure generated by the gas in the compressed air chamber is 0.1-10MPa and the temperature is 300-2000K, the gas temperature in the channel is 300K-20000K, the pressure is 1-20MPa, and the pressure in the first and second air-filled chambers is 0.1-5MPa and the temperature is 300-500K; The inflatable gas in the first inflatable chamber, the second inflatable chamber, the compressed gas chamber and the booster gas chamber is one or more of SF6, CO2, N2, CF4, C4-FN, C5-FK, and CF3I.

7. A circuit breaker, characterized in that: It comprises an operating mechanism and a self-propulsion structure according to any one of claims 1 to 6, The operating mechanism is connected to the other end of the pull rod, and during the gate opening process, the self-thrusting structure moves in the gate opening direction under the traction of the operating mechanism; During the closing process, the self-propulsion structure moves in the closing direction under the traction of the above-mentioned operating mechanism.

8. An isolating switch, characterized in that: It comprises an operating mechanism and a self-propulsion structure according to any one of claims 1 to 6, The operating mechanism is connected to the other end of the pull rod, and during the gate opening process, the self-thrusting structure moves in the gate opening direction under the traction of the operating mechanism; During the closing process, the self-propulsion structure moves in the closing direction under the traction of the above-mentioned operating mechanism.

9. A load switch, characterized in that: It comprises an operating mechanism and a self-propulsion structure according to any one of claims 1 to 6, The operating mechanism is connected to the other end of the pull rod, and during the gate opening process, the self-thrusting structure moves in the gate opening direction under the traction of the operating mechanism; During the closing process, the self-propulsion structure moves in the closing direction under the traction of the above-mentioned operating mechanism.

10. A grounding switch, characterized in that: It comprises an operating mechanism and a self-propulsion structure according to any one of claims 1 to 6, The operating mechanism is connected to the other end of the pull rod, and during the gate opening process, the self-thrusting structure moves in the gate opening direction under the traction of the operating mechanism; During the closing process, the self-propulsion structure moves in the closing direction under the traction of the above-mentioned operating mechanism.

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