Arc extinguish chamber supporting seat, arc extinguish chamber and circuit breaker

Abstract

The invention belongs to the field of electric switches, and particularly relates to an arc extinguish chamber supporting seat, an arc extinguish chamber and a circuit breaker. In order to solve the technical problem that a large amount of plasma enters an air compression chamber during closing to affect the arc extinguishing capability during next opening, the invention provides an arc extinguishing chamber supporting seat which comprises a base body, a cavity is formed in the base body, and a separation structure used for separating the cavity of the base body into an air supply cavity and an exhaust cavity is arranged on the base body. The air supply cavity is used for communicating with the air compression chamber through the air supply valve to supply air to the air compression chamber, and the exhaust cavity is used for communicating with a wall hole of the hollow pull rod to receive plasma generated after the sulfur hexafluoride gas is ionized. The invention further provides an arc extinguish chamber and a circuit breaker using the arc extinguish chamber supporting seat. By separating the gas passage of the sulfur hexafluoride gas entering the gas compression chamber from the gas passage of the plasma discharged from the wall hole of the hollow pull rod, the purity of the gas entering the gas compression chamber is improved, and the arc extinguishing capability of the arc extinguishing chamber during next opening is improved.

Description

Technical Field

[0001] This invention belongs to the field of electrical switches, and in particular relates to an arc-extinguishing chamber support base, an arc-extinguishing chamber, and a circuit breaker. Background Technology

[0002] Circuit breakers include an arc-extinguishing chamber, which typically comprises a support base, a thermal expansion chamber, and a compression chamber. Specifically, when the hollow pull rod of the circuit breaker only drives the cylinder of the thermal expansion chamber, the support base is fixedly connected to the compression cylinder of the arc-extinguishing chamber, as shown in the double-acting self-energized thermal expansion type high-voltage sulfur hexafluoride circuit breaker disclosed in Chinese invention patent CN101599389B; when the hollow pull rod of the circuit breaker simultaneously drives the cylinder of the thermal expansion chamber and the cylinder of the compression chamber, the support base is fixedly connected to the piston of the compression chamber, as shown in the thermal expansion self-energized sulfur hexafluoride circuit breaker arc-extinguishing chamber disclosed in Chinese utility model patent CN2546996Y.

[0003] Among them, the double-acting self-powered thermal expansion type high-voltage sulfur hexafluoride circuit breaker disclosed in Chinese invention patent with authorization announcement number CN101599389B has an arc-extinguishing chamber with a compressed air chamber and a pressure relief valve for releasing gas into the cavity of the support seat when the gas pressure in the compressed air chamber is high; the support seat includes a base with an inner cavity, and a terminal seat is provided on the outer peripheral surface of the base. The upper end of the base is fixedly connected to the compressed air cylinder of the arc-extinguishing chamber, and the lower end of the base is fixedly connected to the insulating support; the pull rod of the circuit breaker used to connect with the moving end assembly is a hollow pull rod, and the hollow pull rod is provided with a wall hole that is always connected to the inner cavity of the base. The base is also provided with a through hole that connects the inner cavity of the base and the inner cavity of the circuit breaker housing, so as to exchange the gas in the inner cavity of the base and the gas in the inner cavity of the circuit breaker housing.

[0004] The structure of the air replenishing valve is not specifically described in the circuit breaker described above. However, based on common knowledge in the field, the circuit breaker should include an air replenishing valve that replenishes air to the compressed air chamber when the circuit is closed. The specific structure of the air replenishing valve can be referred to a self-powered arc-extinguishing chamber disclosed in Chinese invention patent CN109767950B. The self-powered arc-extinguishing chamber includes an expansion chamber and a compressed air chamber. The compressed air chamber is provided with an air replenishing channel, and the air replenishing channel is provided with an air replenishing valve for opening when the arc-extinguishing chamber is closed to replenish air to the compressed air chamber.

[0005] When using the aforementioned self-powered arc-extinguishing chamber and circuit breaker, the compressed air chamber is compressed during arc-extinguishing chamber opening. Releasing the gas from the compressed air chamber via the pressure relief valve effectively reduces the operating work required by the operating mechanism during opening. Conversely, the volume of the compressed air chamber increases during arc-extinguishing chamber closing, and replenishing the compressed air chamber via the air replenishment valve effectively reduces the operating work required by the operating mechanism during closing. However, during opening operations, the plasma generated by the electrolysis of sulfur hexafluoride is discharged into the inner cavity of the support base through the hollow tie rod of the circuit breaker and the wall holes on the hollow tie rod. This results in a large amount of plasma from the inner cavity of the support base being drawn into the compressed air chamber through the air replenishment valve during closing operations. This leads to lower purity and poorer insulation performance of the sulfur hexafluoride gas in the compressed air chamber, affecting the arc-extinguishing capability during the next opening operation. Summary of the Invention

[0006] The purpose of this invention is to provide an arc-extinguishing chamber support base to solve the technical problem that, when using the existing technology for opening the arc-extinguishing chamber, the plasma generated after the electrolysis of sulfur hexafluoride is discharged into the inner cavity of the support base through the hollow tie rod and wall holes. Therefore, when closing the circuit, a large amount of plasma in the inner cavity of the support base is drawn into the compression chamber through the gas replenishment valve, resulting in low purity and poor insulation performance of the sulfur hexafluoride gas in the compression chamber, which affects the arc-extinguishing capability during the next opening.

[0007] Another objective of this invention is to provide an arc-extinguishing chamber to solve the same technical problems mentioned above.

[0008] Another objective of this invention is to provide a circuit breaker to solve the same technical problems mentioned above.

[0009] To achieve the above objectives, the technical solution for the arc-extinguishing chamber support provided by this invention is as follows:

[0010] An arc-extinguishing chamber support includes a base for fixed connection with a compressor cylinder or compressor piston of the arc-extinguishing chamber. The base has a cavity inside and a partition structure on the base for dividing the cavity into a gas supply cavity and an exhaust cavity. The gas supply cavity is used to supply gas to the compressor chamber by communicating with the compressor chamber through a gas supply valve. The exhaust cavity is used to communicate with the wall hole of the hollow tie rod to receive the plasma generated after the sulfur hexafluoride gas is ionized. The base also has a gas supply hole for communicating the gas supply cavity and the inner cavity of the circuit breaker housing, and an exhaust hole for communicating the exhaust cavity and the inner cavity of the circuit breaker housing.

[0011] Furthermore, the partition structure includes a partition plate with a clearance hole for avoiding the hollow tie rod. The clearance hole has a guide part for sliding and sealingly engaging with the hollow tie rod, so that after the hollow tie rod is installed on the guide part, an air supply chamber and an exhaust chamber are formed on opposite sides of the partition plate, respectively.

[0012] Furthermore, the end of the partition plate facing the air replenishment cavity is provided with a guide cylinder that slides and cooperates with the hollow tie rod. The outer wall surface of the guide cylinder, the inner wall surface of the partition plate and the base form the air replenishment cavity.

[0013] Furthermore, the length of the guide tube satisfies the following: in the initial stage of opening the circuit breaker, the wall hole on the hollow tie rod is always located inside the guide tube; only at the end of the opening process can the wall hole on the hollow tie rod emerge from the guide tube and communicate with the exhaust chamber.

[0014] Furthermore, the inner wall of the guide cylinder is provided with a guide ring that slides and seals with the hollow tie rod, and the guide ring and the guide cylinder together constitute the guide part.

[0015] Furthermore, an end plate is provided on the base at the end of the air supply chamber away from the exhaust chamber, and the aforementioned air supply valve and pressure relief valve for supplying the compressed air chamber to the air supply chamber are installed on the end plate.

[0016] Furthermore, a guide seat for sliding cooperation with the hollow tie rod is fixedly connected to the end of the base at the end of the exhaust chamber away from the air supply chamber.

[0017] Furthermore, a shielding cover is fixedly connected to the end of the exhaust chamber away from the air replenishment chamber on the base. This shielding cover is used to shield the connecting bolts of the hollow pull rod and the operating rod when the arc-extinguishing chamber is opened. The shielding cover and the guide seat are installed on the base by the same set of bolts.

[0018] The beneficial effects of the arc-extinguishing chamber support base of the present invention are as follows: The present invention is an improved invention. The base allows for fixed connection between the arc-extinguishing chamber support base and the compressor cylinder or compressor piston. By utilizing a partition structure to divide the chamber of the base into a replenishing chamber and an exhaust chamber, the replenishing chamber can replenish the compressor chamber with gas, while the exhaust chamber can contain the plasma generated during arc extinguishing. This ensures that the sulfur hexafluoride gas entering the compressor chamber is fresh gas from the replenishing chamber, thereby improving the purity of the sulfur hexafluoride gas in the compressor chamber and enhancing the arc-extinguishing capability during the next circuit breaker trip. When the arc-extinguishing chamber support base of this technical solution is applied to a circuit breaker, the gas inside the circuit breaker housing can enter the replenishing chamber through the replenishing port, thus replenishing the replenishing chamber with gas. The exhaust port allows the gas in the exhaust chamber to be discharged into the circuit breaker housing, thereby discharging the plasma from the exhaust chamber and preventing excessive pressure in the exhaust chamber from causing gas backflow, thus avoiding affecting the arc-extinguishing capability during the next circuit breaker trip.

[0019] To achieve the above objectives, the technical solution for the arc-extinguishing chamber provided by this invention is as follows:

[0020] An arc-extinguishing chamber includes a cylinder and an arc-extinguishing chamber support. The arc-extinguishing chamber support includes a base for fixed connection with a compressor cylinder or compressor piston of the arc-extinguishing chamber. The base has a cavity inside and a partition structure on the base for dividing the cavity into a replenishing cavity and an exhaust cavity. The replenishing cavity is used to replenish the compressor by communicating with the compressor through a replenishing valve. The exhaust cavity is used to communicate with the wall hole of a hollow tie rod to receive plasma generated after the sulfur hexafluoride gas is ionized. The base also has a replenishing hole for communicating the replenishing cavity and the inner cavity of the circuit breaker housing, and an exhaust hole for communicating the exhaust cavity and the inner cavity of the circuit breaker housing.

[0021] Furthermore, the partition structure includes a partition plate with a clearance hole for avoiding the hollow tie rod. The clearance hole has a guide part for sliding and sealingly engaging with the hollow tie rod, so that after the hollow tie rod is installed on the guide part, an air supply chamber and an exhaust chamber are formed on opposite sides of the partition plate, respectively.

[0022] Furthermore, the end of the partition plate facing the air replenishment cavity is provided with a guide cylinder that slides and cooperates with the hollow tie rod. The outer wall surface of the guide cylinder, the inner wall surface of the partition plate and the base form the air replenishment cavity.

[0023] Furthermore, the length of the guide tube satisfies the following: in the initial stage of opening the circuit breaker, the wall hole on the hollow tie rod is always located inside the guide tube; only at the end of the opening process can the wall hole on the hollow tie rod emerge from the guide tube and communicate with the exhaust chamber.

[0024] Furthermore, the inner wall of the guide cylinder is provided with a guide ring that slides and seals with the hollow tie rod, and the guide ring and the guide cylinder together constitute the guide part.

[0025] Furthermore, an end plate is provided on the base at the end of the air supply chamber away from the exhaust chamber, and the aforementioned air supply valve and pressure relief valve for supplying the compressed air chamber to the air supply chamber are installed on the end plate.

[0026] Furthermore, a guide seat for sliding cooperation with the hollow tie rod is fixedly connected to the end of the base at the end of the exhaust chamber away from the air supply chamber.

[0027] Furthermore, a shielding cover is fixedly connected to the end of the exhaust chamber away from the air replenishment chamber on the base. This shielding cover is used to shield the connecting bolts of the hollow pull rod and the operating rod when the arc-extinguishing chamber is opened. The shielding cover and the guide seat are installed on the base by the same set of bolts.

[0028] The beneficial effects of the arc-extinguishing chamber of this invention are as follows: This invention is an improved invention. The base allows for the fixed connection between the arc-extinguishing chamber support and the compressor cylinder or compressor piston. By utilizing a partition structure to divide the chamber of the base into a replenishing chamber and an exhaust chamber, the replenishing chamber can replenish the compressor chamber with gas, while the exhaust chamber can contain the plasma generated during arc extinguishing. This ensures that the sulfur hexafluoride gas entering the compressor chamber is fresh gas from the replenishing chamber, thereby improving the purity of the sulfur hexafluoride gas in the compressor chamber and enhancing the arc-extinguishing capability during the next circuit breaker trip. When the arc-extinguishing chamber of this technical solution is applied to a circuit breaker, the gas inside the circuit breaker housing can enter the replenishing chamber through the replenishing port, thus replenishing the replenishing chamber. The exhaust port allows the gas in the exhaust chamber to be discharged into the circuit breaker housing, thereby discharging the plasma from the exhaust chamber and preventing excessive pressure in the exhaust chamber from causing gas backflow, thus avoiding affecting the arc-extinguishing capability during the next circuit breaker trip.

[0029] To achieve the above objectives, the technical solution for the circuit breaker provided by this invention is as follows:

[0030] A circuit breaker includes a housing, within which a cylinder and an arc-extinguishing chamber support are disposed. The arc-extinguishing chamber support includes a base for fixed connection with a compressor cylinder or compressor piston of the arc-extinguishing chamber. The base has a cavity inside, and the base has a partition structure for dividing the cavity into a replenishing chamber and an exhaust chamber. The replenishing chamber is used to replenish the compressor chamber by communicating with the compressor chamber through a replenishing valve. The exhaust chamber is used to communicate with a wall hole of a hollow tie rod to receive plasma generated after the sulfur hexafluoride gas is ionized. The base also has a replenishing hole for communicating the replenishing chamber and the housing cavity of the circuit breaker, and an exhaust hole for communicating the exhaust chamber and the housing cavity of the circuit breaker.

[0031] Furthermore, the partition structure includes a partition plate with a clearance hole for avoiding the hollow tie rod. The clearance hole has a guide part for sliding and sealingly engaging with the hollow tie rod, so that after the hollow tie rod is installed on the guide part, an air supply chamber and an exhaust chamber are formed on opposite sides of the partition plate, respectively.

[0032] Furthermore, the end of the partition plate facing the air replenishment cavity is provided with a guide cylinder that slides and cooperates with the hollow tie rod. The outer wall surface of the guide cylinder, the inner wall surface of the partition plate and the base form the air replenishment cavity.

[0033] Furthermore, the length of the guide tube satisfies the following: in the initial stage of opening the circuit breaker, the wall hole on the hollow tie rod is always located inside the guide tube; only at the end of the opening process can the wall hole on the hollow tie rod emerge from the guide tube and communicate with the exhaust chamber.

[0034] Furthermore, the inner wall of the guide cylinder is provided with a guide ring that slides and seals with the hollow tie rod, and the guide ring and the guide cylinder together constitute the guide part.

[0035] Furthermore, an end plate is provided on the base at the end of the air supply chamber away from the exhaust chamber, and the aforementioned air supply valve and pressure relief valve for supplying the compressed air chamber to the air supply chamber are installed on the end plate.

[0036] Furthermore, a guide seat for sliding cooperation with the hollow tie rod is fixedly connected to the end of the base at the end of the exhaust chamber away from the air supply chamber.

[0037] Furthermore, a shielding cover is fixedly connected to the end of the exhaust chamber away from the air replenishment chamber on the base. This shielding cover is used to shield the connecting bolts of the hollow pull rod and the operating rod when the arc-extinguishing chamber is opened. The shielding cover and the guide seat are installed on the base by the same set of bolts.

[0038] The beneficial effects of the circuit breaker of the present invention are as follows: The present invention is an improved invention. The base allows for the fixed connection between the arc-extinguishing chamber support and the air cylinder or air chamber piston; the partition structure divides the chamber of the base into a replenishing chamber and an exhaust chamber, allowing the replenishing chamber to supply air to the air chamber, and the exhaust chamber to contain the plasma generated during arc extinguishing, ensuring that the sulfur hexafluoride gas entering the air chamber is fresh gas from the replenishing chamber, thereby improving the purity of the sulfur hexafluoride gas in the air chamber and enhancing the arc-extinguishing capability of the arc-extinguishing chamber during the next trip; the replenishing port allows gas from inside the circuit breaker housing to enter the replenishing chamber, thus supplying air to the replenishing chamber, and the exhaust port allows gas from the exhaust chamber to be discharged into the circuit breaker housing, thereby discharging the plasma from the exhaust chamber, preventing excessive pressure in the exhaust chamber from causing gas backflow, and avoiding affecting the arc-extinguishing capability during the next trip of the arc-extinguishing chamber. Attached Figure Description

[0039] Figure 1 This is a perspective view of an embodiment of the arc-extinguishing chamber support base of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of the arc-extinguishing chamber support base of the present invention after it is connected with other structures and the arc-extinguishing chamber is closed;

[0041] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0042] Figure 4 for Figure 2 Sectional view along the BB direction;

[0043] Figure 5 This is a schematic diagram of the structure of the arc-extinguishing chamber support base of the present invention after it is connected with other structures and the arc-extinguishing chamber is opened.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Base; 2. Guide cylinder; 21. Guide ring; 3. Air inlet hole; 4. Exhaust hole; 5. Outlet socket; 6. Countersunk hole; 7. Air inlet valve; 8. Guide seat; 81. Shielding cover; 9. Divider plate; 101. Compressed air chamber; 102. Hollow tie rod; 103. Wall hole; 104. Current transformer; 105. Insulating support; 106. Operating rod; 107. Connecting bolt. Detailed Implementation

[0046] To address the problems mentioned in the background art, the main inventive concept of this invention is as follows: by setting separate gas supply chambers and exhaust chambers, the gas passage for sulfur hexafluoride gas entering the compressor chamber and the gas passage for plasma discharged from the wall hole of the hollow pull rod are separated, ensuring that the gas entering the compressor chamber is fresh sulfur hexafluoride gas from the gas supply chamber, thereby improving the purity of sulfur hexafluoride gas in the compressor chamber and enhancing the arc extinguishing capability of the arc extinguishing chamber during the next circuit breaker trip.

[0047] The present invention will be further described in detail below with reference to the embodiments.

[0048] Specific embodiments of the arc-extinguishing chamber support provided by the present invention:

[0049] like Figure 1-5 As shown in the figure, in one specific embodiment, the arc-extinguishing chamber support includes a base 1 for fixed connection with a compressor cylinder or compressor piston. The base 1 has a cavity inside. The base 1 is provided with a partition structure for dividing the cavity of the base 1 into a gas supply cavity and an exhaust cavity. The gas supply cavity is used to supply gas to the compressor 101 by communicating with the compressor 101 through a gas supply valve 7. The exhaust cavity is used to communicate with the wall hole 103 of the hollow tie rod 102 to receive the plasma generated after the sulfur hexafluoride gas is ionized. The base 1 is also provided with a gas supply hole 3 for communicating with the gas supply cavity and the inner cavity of the circuit breaker housing. The base 1 is also provided with an exhaust hole 4 for communicating with the exhaust cavity and the inner cavity of the circuit breaker housing.

[0050] Specifically, when the hollow tie rod 102 of the circuit breaker only drives the cylinder of the thermal expansion chamber to move, the base 1 is fixedly connected to the air cylinder of the arc-extinguishing chamber; when the hollow tie rod 102 of the circuit breaker drives both the cylinder of the thermal expansion chamber and the cylinder of the air cylinder to move, the base 1 is fixedly connected to the piston of the air chamber.

[0051] Specifically, the air replenishment chamber is provided with an air replenishment valve 7 for connecting the air replenishment chamber and the pressure chamber 101, so that the gas in the air replenishment chamber can enter the pressure chamber 101 when the circuit is closed; of course, in other specific embodiments, when the pressure chamber 101 has an air replenishment valve 7, the air replenishment chamber is used to accommodate the air replenishment valve 7 of the pressure chamber 101 so that the air replenishment channel of the pressure chamber 101 is connected to the air replenishment chamber.

[0052] Specifically, after applying the above-mentioned arc-extinguishing chamber support to the circuit breaker, one end of the arc-extinguishing chamber support is fixedly connected to the air cylinder or the air chamber piston, and the other end is fixedly connected to the insulating support 105. The end of the insulating support 105 away from the arc-extinguishing chamber support is fixedly connected to the operating mechanism, thereby ensuring that the operating mechanism is at a low potential. The air supply chamber is connected to the inner cavity of the circuit breaker housing through the air supply hole 3, and the exhaust chamber is connected to the inner cavity of the circuit breaker housing through the exhaust hole 4.

[0053] The base 1 allows for the fixed connection between the arc-extinguishing chamber support and the compressor cylinder or compressor piston. The base 1 is divided into a replenishing chamber and an exhaust chamber using a partition structure. The replenishing chamber replenishes the compressor chamber 101 with gas, while the exhaust chamber contains the plasma generated during arc extinguishing. This ensures that the sulfur hexafluoride gas entering the compressor chamber 101 is fresh gas from the replenishing chamber, thereby increasing the purity of the sulfur hexafluoride gas in the compressor chamber 101 and improving the arc-extinguishing capability during the next circuit breaker trip. When the arc-extinguishing chamber support in this technical solution is applied to a circuit breaker, the replenishing port 3 allows gas from inside the circuit breaker housing to enter the replenishing chamber, replenishing the gas supply. The exhaust port 4 allows the gas in the exhaust chamber to be discharged into the circuit breaker housing, thus venting the plasma from the exhaust chamber and preventing excessive pressure in the exhaust chamber from causing gas backflow, which would affect the arc-extinguishing capability during the next circuit breaker trip.

[0054] like Figure 2 As shown, to simplify the structure, in one specific embodiment, the partition structure includes a partition plate 9. The partition plate 9 has a clearance hole for accommodating the hollow tie rod 102. A guide portion is provided at the clearance hole for guiding and sliding sealing with the hollow tie rod 102, so that after the hollow tie rod 102 is installed on the guide portion, an air-injection chamber and an air-exhaust chamber are formed on opposite sides of the partition plate 9, respectively. The partition structure not only serves to separate the chambers but also guides the hollow tie rod 102 through the guide portion, resulting in a simple structure.

[0055] Specifically, such as Figure 2 As shown, to further simplify the structure, a guide cylinder 2 is provided at the end of the partition plate 9 facing the air replenishment cavity, which slides and guides the hollow tie rod 102. The air replenishment cavity is formed between the outer wall surface of the guide cylinder 2, the partition plate 9, and the inner wall surface of the base 1. At this time, the inner wall surface of the guide cylinder 2 is used to guide the hollow tie rod 102, and the outer wall surface of the guide cylinder 2 is used to form the air replenishment cavity. The guide cylinder 2 plays two roles at the same time, which simplifies the structure and makes it easier to set up the air replenishment cavity.

[0056] However, in other specific embodiments, a partition cylinder may be additionally provided on the partition plate 9, and the outer wall surface of the partition cylinder, the partition plate 9 and the inner wall surface of the base 1 form an air supply cavity, with the guide cylinder 2 disposed within the space enclosed by the inner wall surface of the partition cylinder; or, the guide cylinder 2 may be disposed within the exhaust cavity; or, two connecting beams may be separately provided on the inner wall surface of the base 1, with the guide cylinder 2 not in contact with the partition plate 9, and the guide cylinder 2 fixed to the inner wall surface of the base 1 by the connecting beams, and the partition plate 9 is provided with the aforementioned partition cylinder. In this case, the partition cylinder and the partition plate 9 constitute a partition structure, and the partition structure does not include the guide portion.

[0057] like Figure 2 As shown, in order to better guide the hollow tie rod 102, in one specific embodiment, a guide ring 21 is provided on the inner wall surface of the guide cylinder 2 to slide and seal with the hollow tie rod 102. The guide ring 21 and the guide cylinder 2 together constitute the guide part, which can better guide the hollow tie rod 102. However, in other specific embodiments, the guide ring 21 may not be provided, and the guide cylinder 2 may directly slide and seal with the hollow tie rod 102; or, the guide cylinder 2 may not be provided, and the guide ring 21 may be directly provided at the clearance hole of the partition plate 9 to slide and seal with the hollow tie rod 102.

[0058] like Figure 2 and Figure 5 As shown, in order to reduce the operating work required by the operating mechanism during opening, in one specific implementation, the length of the guide cylinder 2 satisfies the following: during the closing stage and the initial stage of opening, the wall hole 103 on the hollow tie rod 102 is always located inside the guide cylinder 2; only at the end of the opening stage can the wall hole 103 on the hollow tie rod 102 pass through the guide cylinder 2 and communicate with the exhaust chamber. Figure 2 As shown, in the closed state, the wall hole 103 of the hollow pull rod 102 is located inside the guide cylinder 2. Due to the guide cylinder 2 and the hollow pull rod 102 slidingly engaging, the gap between the guide cylinder 2 and the hollow pull rod 102 is very small. During the opening process, the operating rod 106 of the operating mechanism drives the hollow pull rod 102 to move. The high-pressure gas generated during arc extinguishing enters the hollow pull rod 102 from the nozzle of the arc extinguishing chamber. Because the gap between the guide cylinder 2 and the hollow pull rod 102 is very small, in the initial stage of opening, the high-pressure gas cannot quickly flow out from the gap between the guide cylinder 2 and the hollow pull rod 102. Therefore, the high-pressure gas pushes the hollow lever towards the direction of the operating rod 106, thereby reducing the operating work required by the operating mechanism. Figure 5As shown, at the end of the tripping period and after the tripping is completed, the wall hole 103 of the hollow tie rod 102 extends out of the guide cylinder 2 and communicates with the exhaust chamber, thereby allowing the plasma generated after the electrolysis of sulfur hexafluoride gas to pass from the nozzle through the hollow tie rod 102 into the exhaust chamber. However, in other specific embodiments, the wall hole 103 of the hollow tie rod 102 can be kept inside the exhaust chamber.

[0059] like Figure 2 As shown, to further reduce the operating work required by the operating mechanism when opening the circuit breaker, in one specific embodiment, an end plate is provided on the base 1 at the end of the air supply chamber away from the exhaust chamber (i.e., an end plate is provided on the side of the air supply chamber away from the exhaust chamber, and the end plate is set on the base 1; in this case, the end plate, the outer wall of the guide cylinder 2, the partition plate 9, and the inner wall of the base 1 together form the air supply chamber). The end plate is equipped with the aforementioned air supply valve 7 and a pressure relief valve (not shown in the figure) for releasing pressure from the compressed air chamber 101 into the air supply chamber. This allows the gas in the compressed air chamber 101 to enter the air supply chamber through the pressure relief valve after the air pressure in the compressed air chamber 101 reaches a set value, thereby reducing the operating work required by the operating mechanism when opening the circuit breaker. However, in other specific embodiments, when the compressed air chamber 101 already has a pressure relief valve, the air supply chamber is also used to accommodate the pressure relief valve of the compressed air chamber 101 so that the pressure relief channel of the compressed air chamber 101 is connected to the air supply chamber, thereby reducing the operating work required by the operating mechanism when opening the circuit breaker.

[0060] It should be noted that although the sulfur hexafluoride gas in the compressor chamber 101 will enter the gas replenishment chamber through the pressure relief valve when the circuit is opened, the sulfur hexafluoride gas in the compressor chamber 101 is not electrolyzed, so it will not affect the purity of the sulfur hexafluoride gas in the gas replenishment chamber, and therefore will not affect the purity of the sulfur hexafluoride gas replenished into the compressor chamber 101 when the circuit is closed.

[0061] In other specific embodiments, a gas guide pipe can be provided at the pressure relief valve, with one end of the gas guide pipe connected to the pressure relief valve and the other end extending into the exhaust chamber, so that the gas discharged from the pressure relief valve can directly enter the exhaust chamber.

[0062] like Figure 2As shown, since the end of the hollow tie rod 102 connected to the operating rod 106 extends out of the guide cylinder 2 to form a cantilever, the movement trajectory of the hollow tie rod 102 may deviate when the length of the part of the hollow tie rod 102 extending out of the guide cylinder 2 is relatively long. In order to better guide the hollow tie rod 102, as a specific embodiment, a guide seat 8 for guiding and sliding cooperation with the hollow tie rod 102 is fixedly connected to the end of the exhaust chamber away from the air supply chamber on the base 1 (that is, the guide seat 8 is set on the base 1, and the guide seat 8 is located on the side of the exhaust chamber away from the air supply chamber). The guide seat 8 can guide the end of the hollow tie rod 102 connected to the operating rod 106. The hollow tie rod 102 can be guided from multiple points through the guide seat 8, the guide cylinder 2, and the guide ring 21, thereby ensuring that the movement trajectory of the hollow tie rod 102 does not deviate. However, in other specific embodiments, the guide seat 8 may not be provided, and the hollow tie rod 102 may be guided only by the guide cylinder 2 and the guide ring 21. The movement trajectory of the hollow tie rod 102 may be deviated by guiding the operating lever 106 of the operating mechanism.

[0063] like Figure 2 and Figure 4 As shown, since the connecting bolt 107 of the hollow pull rod 102 and the operating rod 106 is located inside the insulating support 105 when the circuit is opened, in order to optimize the electric field, in one specific embodiment, a shield 81 is fixedly connected to the end of the base 1 away from the exhaust chamber and the gas replenishment chamber to shield the connecting bolt 107 of the hollow pull rod 102 and the operating rod 106 when the arc-extinguishing chamber is opened (that is, the shield 81 is set on the base 1 and the shield 81 is located on the side of the exhaust chamber away from the gas replenishment chamber), thereby optimizing the electric field at the connecting bolt 107 when the circuit is opened and preventing the insulating support 105 from being broken down. Specifically, the shield 81 and the guide seat 8 are installed on the base 1 by the same set of bolts, which is simple in structure. However, in other specific embodiments, the shield 81 and the guide seat 8 can also be installed on the base by two sets of bolts respectively.

[0064] However, in other specific embodiments, the shield 81 may be omitted, and the length of the base 1 and guide seat 8 along the axial direction of the hollow tie rod 102 may be increased, so that the connecting bolt 107 is also located within the guide seat 8 when the circuit breaker is opened; or, when the guide seat 8 is not provided, the connecting bolt 107 is also located within the base 1 when the circuit breaker is opened. By providing the shield 81, the length of the base 1 along the axial direction of the hollow tie rod 102 can be shortened, thereby providing conditions for the miniaturization of the circuit breaker.

[0065] like Figure 2 As shown, to facilitate the miniaturization of the circuit breaker, a terminal block 5 is also provided on the outer peripheral surface of the base 1. Specifically, as... Figure 2As shown, the outlet bracket 5 is used for conductive connection with the current transformer 104, thereby enabling the base 1 to simultaneously support both the arc-extinguishing chamber and the current transformer 104. However, in other specific embodiments, the outlet bracket 5 can also be used for conductive connection with other electrical components within the circuit breaker; alternatively, the outlet bracket 5 may not be provided on the base 1. When the arc-extinguishing chamber support is applied to the circuit breaker, the end of the base 1 away from the arc-extinguishing chamber is fixedly connected to the conductive cylinder, and the outer circumferential surface of the conductive cylinder is provided with the outlet bracket 5 for conductive connection with the current transformer 104. The end of the conductive cylinder away from the base 1 is fixedly connected to the insulating support 105. By setting the outlet bracket 5 on the outer circumferential surface of the base 1, the need for an additional conductive cylinder is eliminated. This facilitates the miniaturization of the circuit breaker after applying the aforementioned arc-extinguishing chamber support to it.

[0066] like Figure 2 As shown, in order to optimize the electric field at the connection between the base 1 and the arc-extinguishing chamber and the insulating support 105, one end of the base 1 is provided with a countersunk hole 6 for accommodating the bolt head of the bolt connecting the compressor cylinder and the base 1, or one end of the base 1 is provided with a countersunk hole 6 for accommodating the bolt head of the bolt connecting the compressor cylinder piston and the base 1; at the same time, the other end of the base 1 is provided with a countersunk hole 6 for accommodating the bolt head of the bolt connecting the base 1 and the insulating support 105, thereby optimizing the electric field at the bolt connection between the base 1 and the compressor cylinder or the compressor cylinder piston and the bolt connection between the base 1 and the insulating support 105. After applying the arc-extinguishing chamber support to the circuit breaker, the withstand voltage rating of the circuit breaker can be effectively improved. However, in other specific embodiments, the countersunk hole 6 may not be provided. Instead, a shielding cover for shielding the electric field of the bolt may be provided at the connection between the base 1 and the compressor cylinder or compressor piston and at the connection between the base 1 and the insulating support 105. Alternatively, the countersunk hole 6 may be provided at one end of the base 1 and the shielding cover described above may be provided at the other end.

[0067] It should be noted that, in order to facilitate the miniaturization of the circuit breaker, as a specific implementation method, firstly, the arc-extinguishing chamber support itself is a conductor, capable of conducting electricity; secondly, the arc-extinguishing chamber support is fixedly connected to the air cylinder or air cylinder piston, and the arc-extinguishing chamber support is fixedly connected to the current transformer 104 and the insulating support 105, capable of providing connection and support; thirdly, the guide cylinder 2, guide ring 21, and guide seat 8 are provided, which can effectively guide the hollow tie rod 102; fourthly, through countersunk head... The shielding cover 81 on the hole 6 and guide seat 8 can shield the bolts; fifthly, the gas supply chamber and exhaust chamber are separated by the partition plate 9 and guide cylinder 2, which can separate the new and old gases. The new gas refers to high-purity sulfur hexafluoride gas, and the old gas refers to the plasma generated after the sulfur hexafluoride is electrolyzed; sixthly, the gas supply chamber, gas supply valve 7 and gas supply hole 3 can supply gas to the pressure chamber 101; seventhly, the exhaust chamber and exhaust hole 4 can exhaust the plasma. Therefore, the arc-extinguishing chamber support has multiple functions and does not require additional structures to achieve the above functions. When the arc-extinguishing chamber support is applied to the circuit breaker, the size of the circuit breaker can be effectively reduced.

[0068] Specific embodiments of the arc-extinguishing chamber provided by the present invention:

[0069] The arc-extinguishing chamber includes a cylinder and an arc-extinguishing chamber support. The specific structure of the arc-extinguishing chamber support is the same as that in the specific embodiment of the arc-extinguishing chamber support of the present invention, and will not be described again here.

[0070] Specific embodiments of the circuit breaker provided by this invention:

[0071] The circuit breaker includes a housing, inside which a cylinder and an arc-extinguishing chamber support are provided. The specific structure of the arc-extinguishing chamber support is the same as that in the specific embodiment of the arc-extinguishing chamber support of the present invention, and will not be described again here. The air supply chamber of the arc-extinguishing chamber support is connected to the inner cavity of the housing through an air supply hole, and the exhaust chamber of the arc-extinguishing chamber support is connected to the inner cavity of the housing through an exhaust hole, thereby realizing the air supply and exhaust functions of the arc-extinguishing chamber support.

[0072] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An arc-extinguishing chamber support base, comprising a base for fixed connection with a compressor cylinder or compressor piston of the arc-extinguishing chamber, the base having an internal cavity, characterized in that, The substrate has a partition structure for dividing the substrate chamber into a gas supply chamber and a gas exhaust chamber. The gas supply chamber is used to supply gas to the gas chamber by communicating with the gas compression chamber through a gas supply valve. The gas exhaust chamber is used to communicate with the wall hole of the hollow tie rod to receive the plasma generated after the sulfur hexafluoride gas is ionized. The substrate also has a gas supply hole for communicating with the gas supply chamber and the inner cavity of the circuit breaker housing, and a gas exhaust hole for communicating with the gas exhaust chamber and the inner cavity of the circuit breaker housing.

2. The arc-extinguishing chamber support as described in claim 1, characterized in that, The partition structure includes a partition plate with a clearance hole for avoiding the hollow tie rod. The clearance hole has a guide part for sliding and sealing with the hollow tie rod, so that after the hollow tie rod is installed on the guide part, the opposite sides of the partition plate form an air supply chamber and an exhaust chamber respectively.

3. The arc-extinguishing chamber support as described in claim 2, characterized in that, The end of the partition plate facing the air replenishment chamber is provided with a guide cylinder that slides and cooperates with the hollow tie rod. The outer wall of the guide cylinder, the partition plate and the inner wall of the base form the air replenishment chamber.

4. The arc-extinguishing chamber support as described in claim 3, characterized in that, The length of the guide tube satisfies the following condition: during the initial stage of circuit breaking, the hole on the hollow tie rod is always located inside the guide tube; only at the end of the circuit breaking can the hole on the hollow tie rod emerge from the guide tube and communicate with the exhaust chamber.

5. The arc-extinguishing chamber support as described in claim 3 or 4, characterized in that, The inner wall of the guide cylinder is provided with a guide ring that slides and seals with the hollow tie rod. The guide ring and the guide cylinder together constitute the guide part.

6. The arc-extinguishing chamber support as described in any one of claims 1-4, characterized in that, An end plate is provided on the base at the end of the air supply chamber away from the exhaust chamber. The end plate is equipped with the aforementioned air supply valve and the pressure relief valve that supplies pressure relief from the compressed air chamber to the air supply chamber.

7. The arc-extinguishing chamber support as described in any one of claims 1-4, characterized in that, A guide seat for sliding cooperation with the hollow tie rod is fixedly connected to the end of the base away from the exhaust chamber and the air supply chamber.

8. The arc-extinguishing chamber support as described in claim 7, characterized in that, A shielding cover is fixedly connected to the end of the exhaust chamber away from the air replenishment chamber on the base. This shielding cover is used to shield the connecting bolts of the hollow pull rod and the operating rod when the arc extinguishing chamber is opened. The shielding cover and the guide seat are installed on the base by the same set of bolts.

9. An arc-extinguishing chamber, comprising a cylinder and an arc-extinguishing chamber support, characterized in that, The arc-extinguishing chamber support is the arc-extinguishing chamber support as described in any one of claims 1-8.

10. A circuit breaker, comprising a housing, wherein a cylinder and an arc-extinguishing chamber support are disposed within the housing, characterized in that, The arc-extinguishing chamber support is the arc-extinguishing chamber support as described in any one of claims 1-8, the air supply chamber is connected to the inner cavity of the shell through the air supply hole, and the exhaust chamber is connected to the inner cavity of the shell through the exhaust hole.

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