load switch

Abstract

The application provides a load switch, comprising: a shell having a containing cavity and an air inlet for communicating with the containing cavity; a moving contact and a stationary contact, both arranged in the containing cavity; a piston movably arranged in the containing cavity and separating the containing cavity into a first gas chamber and a second gas chamber independent of each other, the piston being connected with the moving contact, the air inlet being communicated with the first gas chamber, and the moving contact and the stationary contact both being located in the second gas chamber; wherein, an arc extinguishing channel is further arranged on the shell, and the piston has a closed state and an open state; when the piston is in the closed state, the air inlet is connected with high-pressure gas, and the arc extinguishing channel is cut off from the containing cavity; when the piston is in the open state, the air inlet is closed, and the insulation gas in the first gas chamber enters the second gas chamber through the arc extinguishing channel. Through the technical scheme provided by the application, the technical problem that the air pressure in the insulation cabinet is high in order to effectively arc the load switch in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of load switch, in particular to a load switch. BACKGROUND

[0002] At present, the load switch is a switch electrical apparatus between the disconnecting switch and the circuit breaker, which contains a device with certain arc extinguishing effect, and can realize the breaking of rated current and overload current. If there is arc extinguishing defect during the breaking of the gas blowing arc extinguishing load switch, the phenomenon of unextinguished arc will occur. This phenomenon not only does not realize the circuit breaking, but also causes the melting and burning of the contact surface of the load switch due to the high temperature characteristics of the arc. In view of this phenomenon, the existing technical solutions mostly increase the gas concentration in the insulation cabinet for effective arc extinguishing.

[0003] However, due to the mechanical performance of the load switch itself, increasing the gas concentration in the insulation cabinet will cause the increase of the gas pressure in the cabinet, and the continuous increase of the gas pressure will cause the deformation of the cabinet body of the gas insulation cabinet, which is not conducive to ensuring the stability of the insulation cabinet and is also not conducive to the stability of other structures in the insulation cabinet. SUMMARY

[0004] The main purpose of the present application is to provide a load switch to solve the technical problem that the gas pressure in the insulation cabinet is large in order to effectively extinguish the arc of the load switch in the prior art.

[0005] In order to achieve the above purpose, the present application provides a load switch, comprising: a shell, the shell has a containing cavity and an air inlet for communicating with the containing cavity; a moving contact and a stationary contact, both of which are arranged in the containing cavity, and the moving contact is arranged opposite to the stationary contact; a piston, which is movably arranged in the containing cavity and separates the containing cavity into a first gas chamber and a second gas chamber which are independent of each other, the piston is connected with the moving contact, the air inlet is communicated with the first gas chamber, and the moving contact and the stationary contact are both located in the second gas chamber; wherein, the shell is further provided with an arc extinguishing channel, two communication ends of the arc extinguishing channel are respectively used for communicating with the first gas chamber and the second gas chamber, and the piston has a closing state and an opening state; when the piston is in the closing state, the air inlet is filled with high-pressure gas, and the arc extinguishing channel is disconnected with the containing cavity, so that the piston drives the moving contact to move towards the stationary contact; when the piston is in the opening state, the air inlet is closed, and the piston drives the moving contact to move away from the stationary contact, so that the insulating gas in the first gas chamber enters the second gas chamber through the arc extinguishing channel.

[0006] Further, the arc extinguishing channel is located on the side of the containing cavity away from the air inlet.

[0007] Further, the load switch further comprises: a first connecting rod connected with the piston, the first connecting rod is located at the end of the piston away from the moving contact, and the first connecting rod is arranged on the shell.

[0008] Further, the load switch further comprises a second connecting rod connected with the piston, the second connecting rod being located between the moving contact and the piston, and the piston being connected with the moving contact through the second connecting rod.

[0009] Further, the load switch further comprises an air outlet arranged on the shell, the air outlet being arranged at intervals with the air inlet.

[0010] Further, the air outlet is communicated with the second air chamber.

[0011] Further, the load switch further comprises a pressure stabilizing air valve arranged at the air outlet.

[0012] Further, the load switch further comprises an air inlet one-way valve arranged at the air inlet, and / or an arc blowing one-way valve arranged at a communication end of the arc extinguishing channel connected with the second air chamber, and / or an air outlet one-way valve arranged at a communication end of the arc extinguishing channel connected with the first air chamber.

[0013] Further, the load switch further comprises an insulation cabinet having an insulation air chamber, the shell being arranged in the insulation air chamber, and insulation gas in the insulation air chamber entering the first air chamber through the air inlet.

[0014] Further, a first sealing member is arranged at the air inlet, and / or the air outlet one-way valve is arranged at the communication end of the arc extinguishing channel connected with the first air chamber, and / or the arc blowing one-way valve is arranged at the communication end of the arc extinguishing channel connected with the second air chamber.

[0015] By separately arranging the shell to form the containing cavity, and placing the moving contact and the static contact in the containing cavity, the arc extinguishing gas concentration can be effectively improved by separately increasing the gas concentration of the local insulation gas in the shell, and the arc extinguishing capability is effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the application, and together with the specification explain the application, and do not limit the application. In the drawings:

[0017] Figure 1 Fig. 1 shows a partial structure schematic diagram of a load switch provided according to an embodiment of the present application;

[0018] Figure 2 Fig. 2 shows a structure schematic diagram of a shell provided according to an embodiment of the present application.

[0019] In the above drawings, the following reference signs are used:

[0020] 10. Outer shell; 11. Air inlet; 12. First air chamber; 13. Second air chamber; 14. Arc extinguishing channel; 15. Air outlet; 20. Moving contact; 30. Stationary contact; 41. Piston; 42. First connecting rod; 43. Second connecting rod; 50. Pressure regulating valve; 60. Inlet check valve; 70. Outlet check valve; 80. Arc blowing check valve. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a load switch, which includes a housing 10, a moving contact 20, a stationary contact 30, and a piston 41. The housing 10 has a receiving cavity and an air inlet 11 for communicating with the receiving cavity. The moving contact 20 and the stationary contact 30 are both disposed within the receiving cavity, with the moving contact 20 and the stationary contact 30 arranged opposite to each other. The piston 41 is movably disposed within the receiving cavity and divides the receiving cavity into a first air chamber 12 and a second air chamber 13, which are mutually independent. The piston 41 is connected to the moving contact 20, the air inlet 11 communicates with the first air chamber 12, and the moving contact 20 and the stationary contact 30 are both located within the second air chamber 13. The housing 10 also has an arc-extinguishing channel 14, the two connecting ends of which are respectively used to communicate with the first air chamber 12 and the second air chamber 13. The piston 41 has a closed state and an open state. When piston 41 is in the closed state, high-pressure gas is introduced into the air inlet 11, and the arc-extinguishing channel 14 is isolated from the receiving cavity, so that piston 41 drives the moving contact 20 to move closer to the stationary contact 30; when piston 41 is in the open state, air inlet 11 is closed, and piston 41 drives the moving contact 20 to move away from the stationary contact 30, so that the insulating gas in the first gas chamber 12 enters the second gas chamber 13 through the arc-extinguishing channel 14. It should be noted that when piston 41 is in the closed state, piston 41 drives the moving contact 20 to move closer to the stationary contact 30; when piston 41 is in the open state, piston 41 drives the moving contact 20 to move away from the stationary contact 30.

[0023] With the structure, when the piston 41 is in the closing state, the piston 41 drives the moving contact 20 to move towards the static contact 30, the air inlet 11 is in the air inlet state, the insulation gas enters the first gas chamber 12 through the air inlet 11, the arc extinguishing channel 14 is separated from the containing cavity, so as to ensure that the pressure in the first gas chamber 12 increases, thereby ensuring that the piston 41 can smoothly drive the moving contact 20 to perform the closing operation. When the piston 41 is in the opening state, the piston 41 drives the moving contact 20 to move away from the static contact 30, the air inlet 11 is in the closed state, the arc extinguishing channel 14 is communicated with the containing cavity, so that the high-pressure insulation gas in the first gas chamber 12 is blown into the second gas chamber 13 through the arc extinguishing channel 14 to perform arc extinguishing when the moving contact 20 and the static contact 30 are opened. In the embodiment, the containing cavity is formed by separately arranging the shell 10, and the moving contact 20 and the static contact 30 are arranged in the containing cavity. Only the gas concentration of the insulation gas in the shell 10 needs to be increased, and the arc extinguishing gas concentration can be effectively increased, thereby effectively ensuring the arc extinguishing capacity.

[0024] In the embodiment, the arc extinguishing channel 14 is located on the side of the containing cavity away from the air inlet 11. With the structure layout, the communication of the arc extinguishing channel 14 is performed during the opening operation, and the communication of the air inlet 11 is performed during the closing operation. Through the separate structure layout, the mutual interference of the two can be avoided, so as to better ensure the smooth closing and opening.

[0025] Specifically, the load switch in the embodiment further includes a first connecting rod 42, the first connecting rod 42 is connected with the piston 41, the first connecting rod 42 is located at one end of the piston 41 away from the moving contact 20, and the first connecting rod 42 is arranged in the shell 10. With the structure, the first connecting rod 42 can be conveniently operated, so as to realize the closing state or the opening state by changing the movement direction of the first connecting rod 42, thereby facilitating the operation, control and adjustment of the piston 41.

[0026] In the embodiment, the load switch further includes a second connecting rod 43, the second connecting rod 43 is connected with the piston 41, the second connecting rod 43 is located between the moving contact 20 and the piston 41, and the piston 41 is connected with the moving contact 20 through the second connecting rod 43. With the structure, the moving contact 20 and the piston 41 can be conveniently connected, and the situation that the size of the piston 41 is set to be too large to reduce the gas chamber area in the containing cavity is avoided, thereby effectively ensuring that the second gas chamber 13 has sufficient gas containing space to ensure sufficient insulation gas.

[0027] Specifically, the load switch in the embodiment further comprises an air outlet 15, which is arranged on the shell 10 and is spaced apart from the air inlet 11. With such a structure, when the gas entering the air inlet 11 is too high, even higher than the bearing capacity of the shell 10, the exhaust operation through the air outlet 15 can effectively reduce the pressure in the shell 10, thereby ensuring the structural strength of the shell 10 and the operation stability of the load switch.

[0028] In the embodiment, the air outlet 15 is in communication with the second gas chamber 13. With such a structure, when the opening operation is performed, the piston 41 is in the open state, and the high-pressure insulation gas in the first gas chamber 12 enters the second gas chamber 13. In order to avoid the case that the second gas chamber 13 is subjected to excessive pressure, thereby avoiding the case that the second gas chamber 13 causes damage to the shell 10 due to excessive pressure, so as to effectively ensure the smooth opening operation.

[0029] Specifically, the load switch in the embodiment further comprises a pressure stabilizing valve 50, which is arranged at the air outlet 15. With such a structure, the pressure stabilizing valve 50 can effectively ensure the stability of the pressure in the second gas chamber 13. When the pressure in the second gas chamber 13 exceeds the preset pressure value of the pressure stabilizing valve 50, the pressure stabilizing valve 50 will open to release part of the insulation gas, so as to effectively ensure that the pressure in the second gas chamber 13 can be smoothly within the range that the shell 10 can withstand.

[0030] Specifically, the load switch further comprises an air inlet one-way valve 60, which is arranged at the air inlet 11; and / or, the load switch further comprises an arc blowing one-way valve 80, which is arranged at the communication end where the arc extinguishing channel 14 is connected with the second gas chamber 13; and / or, the load switch further comprises an air outlet one-way valve 70, which is arranged at the communication end where the arc extinguishing channel 14 is connected with the first gas chamber 12.

[0031] Preferably, the load switch in the embodiment further comprises an air inlet one-way valve 60, an arc blowing one-way valve 80 and an air outlet one-way valve 70, the air inlet one-way valve 60 is arranged at the air inlet 11, the arc blowing one-way valve 80 is arranged at the communication end where the arc extinguishing channel 14 is connected with the second air chamber 13, and the air outlet one-way valve 70 is arranged at the communication end where the arc extinguishing channel 14 is connected with the first air chamber 12. With such structural arrangement, only one-way air inlet operation through the air inlet 11 can be controlled through the air inlet one-way valve 60, only one-way arc blowing operation through the communication end where the arc extinguishing channel 14 is connected with the second air chamber 13 can be controlled through the arc blowing one-way valve 80, and only one-way air outlet operation through the communication end where the arc extinguishing channel 14 is connected with the first air chamber 12 can be controlled through the air outlet one-way valve 70. In this way, one-way communication operation of the air inlet 11, the communication end where the arc extinguishing channel 14 is connected with the first air chamber 12 and the communication end where the arc extinguishing channel 14 is connected with the second air chamber 13 can be ensured, and the closing and opening of the switch is facilitated.

[0032] In the embodiment, the load switch further comprises an insulation cabinet, the insulation cabinet has an insulation air chamber, the housing 10 is arranged in the insulation air chamber, and the insulation gas in the insulation air chamber enters the first air chamber 12 through the air inlet 11. With such structural arrangement, the insulation gas in the insulation cabinet can be smoothly introduced into the first air chamber 12 during the closing operation, so that the arc extinguishing by the high-pressure insulation gas during the opening of the switch is facilitated, and the amount and pressure of the insulation gas in the insulation cabinet do not need to be increased, and the deformation of the insulation rail due to the large pressure is avoided.

[0033] Specifically, the first sealing member is arranged at the air inlet 11, and / or the second sealing member is arranged at the communication end where the arc extinguishing channel 14 is connected with the first air chamber 12, and / or the third sealing member is arranged at the communication end where the arc extinguishing channel 14 is connected with the second air chamber 13.

[0034] Preferably, the first sealing member is arranged at the air inlet 11, the second sealing member is arranged at the communication end where the arc extinguishing channel 14 is connected with the first air chamber 12, and the third sealing member is arranged at the communication end where the arc extinguishing channel 14 is connected with the second air chamber 13. With such structural arrangement, the sealing property of the air inlet 11 can be facilitated by the first sealing member, the sealing property of the communication end where the arc extinguishing channel 14 is connected with the first air chamber 12 can be facilitated by the second sealing member, and the sealing property of the communication end where the arc extinguishing channel 14 is connected with the second air chamber 13 can be facilitated by the third sealing member. The first sealing member, the second sealing member and the third sealing member in the embodiment can all be in the structure of a sealing ring, and the sealing rings are arranged at the corresponding connection ports of the first sealing member, the second sealing member and the third sealing member, respectively.

[0035] In the embodiment, the load switch further comprises a fourth sealing member arranged at the air outlet 15 to ensure the sealing performance at the air outlet 15. Preferably, the fourth sealing member is a liquid level sealing ring structure, and the sealing ring is arranged at the air outlet 15.

[0036] In the embodiment, the shell 10 is a separation device of the accommodating cavity and the gas chamber of the gas insulated switchgear, and the shell 10 is a sealed structure. The structure can directly increase the arc extinguishing gas concentration in the manner of increasing the internal gas pressure of the load switch without increasing the gas concentration in the gas insulated switchgear, thereby improving the arc extinguishing capability.

[0037] In the operation of the load switch, the internal gas chamber (the internal gas chamber is the accommodating cavity) of the shell 10 is always under a higher pressure than the gas chamber of the gas insulated switchgear, that is, there is a pressure difference between the two gas chambers, but the pressure force formed by the pressure difference will not damage the structure of each part in the accommodating cavity of the load switch.

[0038] In the embodiment, the pressure stabilizing valve 50 is installed at the upper part of the shell 10, and a sealing ring mounting groove is arranged at the connecting part of the pressure stabilizing valve 50 and the sealed shell 10, and the sealing connection between the pressure stabilizing valve 50 and the sealed shell 10 is realized by an O-shaped sealing ring. The pressure stabilizing valve 50 is usually in a normally closed state, and when the internal temperature of the sealed shell 10 rises or the closing operation is performed and the internal pressure of the sealed shell 10 rises to a set value, the pressure stabilizing valve 50 is automatically opened to realize the automatic pressure relief of the sealed pressure maintaining type load switch.

[0039] Specifically, the air inlet one-way valve 60 in the embodiment is installed at the lower part of the shell 10, and a sealing mounting groove is arranged at the connecting part of the air inlet one-way valve 60 and the sealed shell 10, and the sealing connection between the air inlet one-way valve 60 and the sealed shell 10 is realized by an O-shaped sealing ring. During the closing process, the piston 41 moves upward, the pressure of the lower part of the sealed shell 10 decreases, the pressure of the upper part of the sealed shell 10 increases, the air inlet one-way valve 60 is opened, and the arc extinguishing gas is sucked into the gas chamber of the gas insulated switchgear through the one-way property of the air valve, thereby increasing the gas concentration in the sealed shell 10, realizing the automatic pressure increase of the sealed pressure maintaining type load switch, and improving the arc extinguishing capability.

[0040] Specifically, the air outlet one-way valve 70 in the embodiment is installed at the lower part of the shell 10, located at the opposite side of the air inlet one-way valve 60 and inside the airflow channel. A sealing mounting groove is arranged at the connecting part of the air outlet one-way valve 70 and the airflow channel, and the sealing connection between the air outlet one-way valve 70 and the airflow channel is realized by an O-shaped sealing ring.

[0041] In the embodiment, the arc blowing one-way valve 80 is installed at the upper part of the shell 10, located at the same side as the air inlet one-way valve 60 and inside the airflow channel. A sealing mounting groove is arranged at the connecting part of the arc blowing one-way valve 80 and the airflow channel, and the sealing connection between the arc blowing one-way valve 80 and the airflow channel is realized by an O-shaped sealing ring.

[0042] In the embodiment, the shell 10 is integrally formed, the blow arc one-way valve 80 and the outlet gas one-way valve 70 are connected through the arc extinguishing channel 14, during the opening process, the piston 41 moves downward, the gas pressure in the lower part of the sealed shell 10 increases, the gas pressure in the upper part decreases, the inlet gas one-way valve 60 is in the closed state, the outlet gas one-way valve 70 and the blow arc one-way valve 80 are opened, and the arc extinguishing of the blow arc one-way valve 80 is realized through the pressure difference.

[0043] Specifically, the first connecting rod 42, the piston 41 and the second connecting rod 43 are integrally formed, are integrally installed in the shell 10, and divide the shell 10 into two gas chambers, so that the pressure difference during the opening and closing process is realized.

[0044] In the traditional scheme for increasing the arc extinguishing capacity of the load switch by increasing the gas concentration, the gas insulation cabinet is generally used to increase the gas pressure in the cabinet to increase the concentration of the arc extinguishing gas. The method of increasing the gas pressure in the gas insulation cabinet has high requirements for the strength of the cabinet, generally needs to additionally design reinforcing ribs in the gas chamber of the gas insulation cabinet to improve the overall strength of the cabinet, so as to achieve the purpose that the gas chamber of the gas insulation cabinet can withstand a higher concentration of arc extinguishing gas. However, due to the increase of the reinforcing ribs, considering the design concept, structure arrangement and the like of the gas insulation cabinet, sometimes the overall structure in the gas chamber of the gas insulation cabinet will be changed.

[0045] In the embodiment, the load switch utilizes the interaction of gas pressure. When the gas pressure in the gas chamber of the gas insulation cabinet is the same as the gas pressure in the shell 10, the sealed shell 10 will not be stressed due to the mutual offset of the gas pressure. In the embodiment, the load switch adopts a sealed pressure maintaining type. On the basis of ensuring the structural strength of the load switch, the concentration of the arc extinguishing gas in the sealed shell 10 can be further increased without changing the gas pressure in the cabinet of the gas insulation cabinet. The load switch is provided with a pressure stabilizing gas valve 50 at the top, which can adjust the gas pressure in the shell 10. When closing, the inlet gas one-way valve 60 is opened, the insulation gas is sucked into the cabinet, so as to increase the gas pressure in the shell 10, and more effective arc extinguishing is realized. If the gas pressure in the shell 10 is too large, the pressure stabilizing gas valve 50 is automatically opened to remove the excess gas pressure in the shell 10 to ensure the structural stability of the shell 10.

[0046] In the embodiment, by sealing the direct-acting load switch, adding the one-way gas valve and the pressure stabilizing gas valve 50, the purpose of increasing the concentration of the arc extinguishing gas of the gas blow type load switch without changing the gas pressure in the cabinet of the gas insulation cabinet is achieved. Through the design of the shell 10 of the load switch, the installation position of the one-way gas valve and the installation position of the pressure regulating valve, the arc extinguishing capacity can be smoothly improved without increasing the insulation gas in the insulation cabinet.

[0047] Specifically, the load switch in this embodiment can achieve pressure holding and release of insulating gas, and has the ability to effectively extinguish arcs. Utilizing the interaction of gas pressures, when the gas pressure inside the gas-insulated cabinet is the same as the gas pressure inside the sealed housing 10 of the pressure-holding load switch, the sealed housing 10 will not be subjected to stress due to the mutual cancellation of gas pressures. While ensuring the structural strength of the pressure-holding load switch is within acceptable limits, the concentration of arc-extinguishing gas inside the housing 10 can be further increased without changing the gas pressure inside the gas-insulated cabinet.

[0048] The outer casing 10 separates the gas insulation cabinet chamber from the load switch chamber. By utilizing the pressure difference between the two chambers, the gas pressure of the sealed pressure-maintaining load switch chamber can be increased directly without increasing the gas pressure inside the gas insulation cabinet, thereby increasing the concentration of insulating gas in the load switch chamber and improving the arc extinguishing capability.

[0049] Specifically, the pressure-stabilizing valve 50 can depressurize the sealed air chamber inside the load switch. When the air pressure inside the sealed pressure-maintaining load switch rises to the set value of the pressure-stabilizing valve 50 due to factors such as opening and closing or temperature rise, the pressure-stabilizing valve 50 automatically opens to complete the depressurization action of the load switch air chamber. After depressurization is completed, the pressure-stabilizing valve 50 automatically closes. This pressure-stabilizing valve 50 can automatically maintain the air pressure in the load switch air chamber within the range allowed by the structural strength of the load switch.

[0050] Specifically, the air inlet check valve 60 automatically opens when the load switch is closed, drawing insulating gas into the gas-insulated cabinet chamber to increase the concentration of arc-extinguishing gas in the load switch chamber. When closing is complete, this air inlet check valve 60 automatically closes.

[0051] Specifically, the exhaust check valve 70 and the arc blowing check valve 80 have the same valve direction and are connected through an airflow channel. When the load switch is tripped, the exhaust check valve 70 and the arc blowing check valve 80 open to extinguish the arc in the arc blowing check valve 80. When the tripping action is completed, the exhaust check valve 70 and the arc blowing check valve 80 automatically close.

[0052] As can be seen from the above description, the above embodiments of the present invention achieve the following technical effects: without increasing the gas concentration inside the gas-insulated cabinet, the arc-extinguishing gas concentration is increased by directly increasing the gas pressure inside the load switch, thereby improving the arc-extinguishing capability.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] The foregoing description, for purposes of clarity, describes the present application in terms of its components, processes and operations. Such descriptions and representations are the means used by those skilled in the art of describing the structural and functional necessities of and changes to the present application, but are not meant to limit the present application to a particular embodiment. Also, the terms "first", "second", "third", etc., as used in this specification, are used as identifiers to help distinguish between similar items, and are not meant to denote a particular order or sequence. Unless otherwise specifically stated, the relative arrangements of parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the application. Also, it is to be understood that the drawings are not necessarily to scale and that, unless otherwise specifically indicated, the various dimensions and other values are merely illustrative and not restrictive. The techniques, methods, and devices known to those of ordinary skill in the art can not be discussed in detail, but should be considered as if they were discussed herein, to the extent that they are relevant to the description of the present application. In all examples shown and discussed herein, any specific value should be interpreted as merely an example, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It is to be noted that like reference numerals and letters refer to like items in the drawings, and, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0055] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by orientation words such as "front, back, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0056] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices as described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0057] In addition, it should be noted that the use of the words "first", "second", and the like to define parts of components is merely for the convenience of distinguishing the corresponding parts of components, and the words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0058] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A load break switch characterized by, The load switch comprises: a shell (10) having a containing cavity and an air inlet (11) for communicating with the containing cavity; a moving contact (20) and a stationary contact (30) both arranged in the containing cavity, the moving contact (20) being arranged opposite to the stationary contact (30); a piston (41) movably arranged in the containing cavity and separating the containing cavity into a first gas chamber (12) and a second gas chamber (13) independent of each other, the piston (41) being connected with the moving contact (20), the air inlet (11) communicating with the first gas chamber (12), and the moving contact (20) and the stationary contact (30) both being located in the second gas chamber (13); wherein the shell (10) is further provided with an arc extinguishing channel (14), two communicating ends of the arc extinguishing channel (14) being respectively used for communicating with the first gas chamber (12) and the second gas chamber (13), and the piston (41) having a closed state and an open state; when the piston (41) is in the closed state, the air inlet (11) is supplied with high-pressure gas, the arc extinguishing channel (14) is cut off from the containing cavity, so that the piston (41) drives the moving contact (20) to move towards the stationary contact (30); when the piston (41) is in the open state, the air inlet (11) is closed, the piston (41) drives the moving contact (20) to move away from the stationary contact (30), so that the insulation gas in the first gas chamber (12) enters the second gas chamber (13) through the arc extinguishing channel (14); the arc extinguishing channel (14) is located on the side of the containing cavity away from the air inlet (11); the load switch further comprises an air outlet (15) arranged on the shell (10), the air outlet (15) being arranged apart from the air inlet (11); the air outlet (15) communicates with the second gas chamber (13); the load switch further comprises a pressure stabilizing gas valve (50) arranged at the air outlet (15), an air inlet one-way valve (60) arranged at the air inlet (11), and / or an arc blowing one-way valve (80) arranged at the communicating end of the arc extinguishing channel (14) connected with the second gas chamber (13).

2. The load break switch according to claim 1, characterized in that The load switch further comprises: a first connecting rod (42) connected with the piston (41), the first connecting rod (42) being located at the end of the piston (41) away from the moving contact (20), and the first connecting rod (42) being arranged through the shell (10).

3. The load break switch of claim 1, wherein, The load switch further comprises: a second connecting rod (43) connected with the piston (41), the second connecting rod (43) being located between the moving contact (20) and the piston (41), and the piston (41) being connected with the moving contact (20) through the second connecting rod (43).

4. The load break switch of claim 1, wherein, The load switch further comprises: An insulation cabinet has an insulation air chamber, the shell (10) is arranged in the insulation air chamber, and insulation gas in the insulation air chamber enters the first air chamber (12) through the air inlet (11).

5. The load break switch according to claim 1, characterized in that a first sealing member is arranged at the air inlet (11); and / or a second sealing member is arranged at the communication end of the arc extinguishing channel (14) connected with the first air chamber (12); and / or a third sealing member is arranged at the communication end of the arc extinguishing channel (14) connected with the second air chamber (13).

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