阅读说明：本技术 高压开关用活塞单向阀结构、快速接地开关及gis (Piston one-way valve structure for high-voltage switch, quick grounding switch and GIS ) 是由 樊子健 贺晶晶 王志刚 苏戈 张垒 龚咪咪 赵艳涛 马志强 秦政敏 刘分 张路阳 于 2020-06-05 设计创作，主要内容包括：本发明涉及高压开关用活塞单向阀结构、快速接地开关及GIS。GIS包括快速接地开关,快速接地开关包括活塞,活塞上设有单向阀结构,单向阀结构包括活塞主体；活塞主体上设有导向孔,所述导向孔的前端形成进气口；阀球,沿前后方向导向设置在所述导向孔内,所述阀球具有与其导向行程的两末端分别对应的关闭位置和打开位置,阀球处于关闭位置时封堵住所述进气口以关闭单向阀；连通通道,具有前通道口和后通道口,后通道口与所述活塞主体的后侧空间连通,用于形成出气口,前通道口与所述导向孔连通,阀球处于打开位置时,所述前通道口与进气口连通。整个单向阀结构简单,依靠阀球的前后活动实现单向阀的打开或者关闭,使用可靠性好。(The invention relates to a piston one-way valve structure for a high-voltage switch, a quick grounding switch and a GIS. The GIS comprises a quick grounding switch, the quick grounding switch comprises a piston, a one-way valve structure is arranged on the piston, and the one-way valve structure comprises a piston main body; the piston main body is provided with a guide hole, and the front end of the guide hole forms an air inlet; the valve ball is arranged in the guide hole in a guiding manner along the front-back direction, the valve ball is provided with a closing position and an opening position which respectively correspond to the two tail ends of the guide stroke of the valve ball, and when the valve ball is at the closing position, the valve ball blocks the air inlet so as to close the one-way valve; and the communicating channel is provided with a front channel port and a rear channel port, the rear channel port is communicated with the rear space of the piston main body and is used for forming an air outlet, the front channel port is communicated with the guide hole, and when the valve ball is in an opening position, the front channel port is communicated with the air inlet. The whole one-way valve is simple in structure, the one-way valve is opened or closed by means of forward and backward movement of the valve ball, and the use reliability is good.)

1. Piston check valve structure for high-pressure switch, its characterized in that includes:

the piston main body is provided with a front side and a rear side which respectively correspond to the closing direction and the opening direction of a moving contact of the high-voltage switch;

the piston main body is provided with a guide hole, the front end of the guide hole forms an air inlet, and the air inlet is used for allowing air in the front space of the piston main body to enter the one-way valve;

the valve ball is arranged in the guide hole in a guiding manner along the front-back direction, the valve ball is provided with a closing position and an opening position which respectively correspond to the two tail ends of the guide stroke of the valve ball, the closing position is positioned at the front end of the guide hole, the opening position is positioned at the rear end of the guide hole, and the valve ball blocks the air inlet to close the one-way valve when in the closing position;

and the communicating channel is provided with a front channel port and a rear channel port, the rear channel port is communicated with the rear space of the piston main body and is used for forming an air outlet, the front channel port is communicated with the guide hole, and when the valve ball is in an opening position, the front channel port is communicated with the air inlet.

2. The structure of claim 1, wherein the piston body comprises a front piston body and a rear piston body, the pilot hole has a front hole section and a rear hole section, the front hole section is disposed on the front piston body, the rear hole section is disposed on the rear piston body, the front hole section is disposed in a front-rear through manner, and a front end of the front hole section is used for forming an air inlet.

3. The structure of claim 2, wherein the front end of the front hole section is provided with a front protrusion protruding toward the inner side of the front hole section to form a front limit structure, and the valve ball is in a closed position when the top of the valve ball presses against the front limit structure.

4. The structure of the piston check valve for the high pressure switch according to claim 2, wherein the rear hole section penetrates the rear piston body rearward, a rear end of the rear hole section is provided with a rear side protrusion of one circle, and the rear side protrusion protrudes toward an inner side of the rear hole section;

the rear protruding part forms a rear limiting structure, the rear limiting structure is used for limiting the backward movement of the valve ball, and when the valve ball is pressed against the rear limiting structure, the valve ball is in an open position.

5. The structure of the piston check valve for the high pressure switch according to any one of claims 2 to 4, wherein a smooth transition structure is formed between the front side surface and the outer peripheral surface of the rear piston body, and the diameter of the rear end surface of the front piston body is not larger than that of the front end surface of the rear piston body.

6. The piston check valve structure for a high pressure switch according to any one of claims 1 to 4, wherein a part of the ball is exposed to the outside of the intake port when the ball is in the closed position.

7. The piston check valve structure for a high-pressure switch according to any one of claims 1 to 4, wherein the valve ball is a hollow ball.

8. The piston check valve structure for the high-pressure switch according to any one of claims 1 to 4, wherein two communication passages are uniformly distributed in a circumferential direction of the guide hole.

9. A fast grounding switch comprising:

the moving contact is used for realizing switching on and switching off with the corresponding static contact;

a cylinder in which a piston is fitted in a sliding seal;

the piston is synchronously moved with the moving contact and is used for being matched with the cylinder to generate arc extinguishing airflow during brake opening;

the piston is provided with a one-way valve structure, and the one-way valve structure is used for communicating the spaces on two sides of the piston when the switch is switched on;

it is characterized in that the preparation method is characterized in that,

the one-way valve structure is a piston one-way valve structure for a high-pressure switch as claimed in any one of claims 1 to 8.

A GIS, comprising:

a fast grounding switch;

it is characterized in that the preparation method is characterized in that,

the fast grounding switch is the fast grounding switch of claim 9.

Technical Field

The invention relates to a piston one-way valve structure for a high-voltage switch, a quick grounding switch and a GIS.

Background

The quick grounding switch is used for isolating the grounding switch on the line outlet side, has the capacity of closing short-circuit current and opening and closing induced current, and is an important protection device. When the quick grounding switch is switched off and the induced current with larger voltage is generated, the moving contact is easy to generate electric arc, the moving contact and the static contact seat are ablated, and the switching-off time is prolonged. At present, according to the arc extinguishing principle, two modes of blowing arc extinguishing and sucking arc extinguishing exist. In the blowing arc-extinguishing mode, the moving contact structure can compress the gas in the cylinder during the opening action, and blow out the fresh SF flowing at high speed to the fracture at the moment of separating the moving contact and the fixed contact₆The gas displaces the high temperature, turbid gas formed by the arc combustion, and insulation is rapidly established between the fractures after the arc zero crossing.

The mode of air suction type arc extinguishing is as the earthing switch of an air suction type arc extinguishing that chinese patent publication number CN105448591B discloses, its moving contact device includes the cylinder, be equipped with the piston in the cylinder, be formed with the chamber of breathing in below the piston, the piston is connected with the moving contact, the moving contact is the tubular structure, the lower extreme of moving contact is open structure, set up the gas pocket with breathing in the chamber intercommunication on the lateral wall of moving contact, be equipped with the check valve structure on the piston, when separating brake, the check valve closes, the piston goes upward makes the space grow in the chamber of breathing in, form the negative pressure, outside air current gets into the chamber of breathing in along the lumen of moving contact under the promotion of pressure differential, and form the air current at the end opening part of moving contact, take away electric arc heat and metal particle, and make outside clean SF₆The gas is filled to the opening at the tail end of the moving contact to realize arc extinction, when the switch is switched on, the one-way valve is opened, the gas in the gas suction cavity can be upwards discharged, and the normal descending of the piston cannot be influenced.

The existing one-way valve is a one-way valve structure used in an arc extinguishing chamber of a circuit breaker, as disclosed in Chinese patent with application publication No. CN110838421A, a valve plate and a spring of the one-way valve are installed on a bolt, the valve plate is arranged in a sliding way relative to the bolt, the valve plate can seal an air hole under the jacking action of the spring, and the air hole is opened when the pressure is enough, so that the function of one-way conduction is realized. However, the check valve is complex in structure, assembly difficulty is increased, and after the check valve is operated for a long time, bolts are prone to being loosened by vibration and fatigue is prone to being caused by springs, so that the check valve is prone to failure, and use reliability of the check valve is affected.

Disclosure of Invention

The invention aims to provide a piston one-way valve structure for a high-voltage switch, which aims to solve the problems of complex structure and low reliability of the existing one-way valve; the invention also aims to provide a quick grounding switch to solve the problem of low use reliability of the quick grounding switch in the prior art due to the complex structure of the one-way valve; the invention also aims to provide the GIS so as to solve the problem that the GIS in the prior art is low in use reliability due to the complex structure of the one-way valve.

The piston one-way valve structure for the high-voltage switch adopts the following technical scheme:

piston check valve structure for high-pressure switch includes:

the piston main body is provided with a front side and a rear side which respectively correspond to the closing direction and the opening direction of a moving contact of the high-voltage switch;

the piston main body is provided with a guide hole, the front end of the guide hole forms an air inlet, and the air inlet is used for allowing air in the front space of the piston main body to enter the one-way valve;

the valve ball is arranged in the guide hole in a guiding manner along the front-back direction, the valve ball is provided with a closing position and an opening position which respectively correspond to the two tail ends of the guide stroke of the valve ball, the closing position is positioned at the front end of the guide hole, the opening position is positioned at the rear end of the guide hole, and the valve ball blocks the air inlet to close the one-way valve when in the closing position;

and the communicating channel is provided with a front channel port and a rear channel port, the rear channel port is communicated with the rear space of the piston main body and is used for forming an air outlet, the front channel port is communicated with the guide hole, and when the valve ball is in an opening position, the front channel port is communicated with the air inlet.

Has the advantages that: the piston body is provided with a guide hole, the valve ball is arranged in the guide hole in a guiding manner, when the valve ball moves backwards to the rear end of the guide hole, the valve ball enters an opening position, the air inlet is communicated with the communicating channel, the check valve is opened, and the air in the front space of the piston body can enter the rear space of the piston body from the air outlet in the piston body; when the valve ball moves forward to the front end of guiding hole, the valve ball gets into closed position, the air inlet is plugged up in order to close the check valve, whole check valve simple structure, rely on the front and back activity of valve ball to realize opening or closing of check valve, use good reliability, and because the valve ball direction sets up in the guiding hole, the valve ball motion is stable, the effect that pressure can be better is on the valve ball, more be favorable to improving the reliability, and be equipped with the intercommunication passageway alone, be favorable to improving the through-flow area, guarantee the through-flow effect.

Furthermore, the piston main body comprises a front piston body and a rear piston body, the guide hole is provided with a front hole section and a rear hole section, the front hole section is arranged on the front piston body, the rear hole section is arranged on the rear piston body, the front hole section is arranged in a penetrating manner from front to back, and the front end of the front hole section is used for forming an air inlet.

Has the advantages that: the piston main body is formed by a front piston body and a rear piston body, and the valve ball is convenient to install.

Furthermore, the front end of the front hole section is provided with a circle of front protruding part, the front protruding part protrudes towards the inner side of the front hole section to form a front limiting structure, and when the valve ball is pressed against the front limiting structure, the valve ball is in a closed position.

Has the advantages that: the front limiting structure can be directly processed on the front piston body, the structure is simple, and the processing is convenient.

Furthermore, the rear hole section penetrates through the rear piston body backwards, a circle of rear protruding part is arranged at the rear end of the rear hole section, and the rear protruding part protrudes towards the inner side of the rear hole section;

the rear protruding part forms a rear limiting structure, the rear limiting structure is used for limiting the backward movement of the valve ball, and when the valve ball is pressed against the rear limiting structure, the valve ball is in an open position.

Has the advantages that: when guaranteeing valve ball activity space, can reduce the thickness of back piston body, simple structure can directly process out back limit structure on the piston body of back moreover, prevents that the valve ball from droing, and processing is convenient moreover.

Furthermore, a smooth transition structure is formed between the front side face and the outer peripheral face of the rear piston body, and the diameter of the rear end face of the front piston body is not larger than that of the front end face of the rear piston body.

Has the advantages that: the piston main body is conveniently installed in the corresponding cylinder, and when the piston main body reciprocates in the cylinder, friction with the cylinder wall of the cylinder can be reduced.

Further, when the valve ball is in the closed position, a portion of the valve ball is exposed to the outside of the air inlet.

Has the advantages that: the requirement of the one-way through-flow function of the one-way valve is met, and the size of the piston main body is reduced.

Further, the valve ball is a hollow ball.

Has the advantages that: the weight of the valve ball is reduced, so that the valve ball can be stressed to move upwards more easily, and the one-way valve can be opened smoothly.

Furthermore, the communication channel is evenly distributed with two in the circumferential direction of the guide hole.

Has the advantages that: the flow area is increased, and the use requirement of large flow is met.

The quick grounding switch adopts the following technical scheme:

a fast grounding switch comprising:

the moving contact is used for realizing switching on and switching off with the corresponding static contact;

a cylinder in which a piston is fitted in a sliding seal;

the piston is synchronously moved with the moving contact and is used for being matched with the cylinder to generate arc extinguishing airflow during brake opening;

the piston is provided with a one-way valve structure, and the one-way valve structure is used for communicating the spaces on two sides of the piston when the switch is switched on;

a one-way valve structure comprising:

the piston main body is provided with a front side and a rear side which respectively correspond to the closing direction and the opening direction of a moving contact of the high-voltage switch;

the piston main body is provided with a guide hole, the front end of the guide hole forms an air inlet, and the air inlet is used for allowing air in the front space of the piston main body to enter the one-way valve;

the valve ball is arranged in the guide hole in a guiding manner along the front-back direction, the valve ball is provided with a closing position and an opening position which respectively correspond to the two tail ends of the guide stroke of the valve ball, the closing position is positioned at the front end of the guide hole, the opening position is positioned at the rear end of the guide hole, and the valve ball blocks the air inlet to close the one-way valve when in the closing position;

and the communicating channel is provided with a front channel port and a rear channel port, the rear channel port is communicated with the rear space of the piston main body and is used for forming an air outlet, the front channel port is communicated with the guide hole, and when the valve ball is in an opening position, the front channel port is communicated with the air inlet.

Has the advantages that: the piston synchronously moving with the moving contact is arranged in the cylinder, so that pressure change is generated under the action of a gas piston of the cylinder, arc extinguishing airflow is formed through the hollow moving contact, a one-way valve structure is arranged on the piston, gas on two sides of the piston is conducted during closing, closing operation is facilitated, a guide hole is formed in the piston main body, a valve ball is guided and arranged in the guide hole, when the valve ball moves backwards to the rear end of the guide hole, the valve ball enters an opening position, an air inlet is communicated with a communication channel, the one-way valve is opened, and gas in the front side space of the piston main body can enter the rear side space of the piston main body from an air outlet in the piston main body; when the valve ball moves forward to the front end of guiding hole, the valve ball gets into closed position, the air inlet is plugged up in order to close the check valve, whole check valve simple structure, rely on the front and back activity of valve ball to realize opening or closing of check valve, use good reliability, and because the valve ball direction sets up in the guiding hole, the valve ball motion is stable, the effect that pressure can be better is on the valve ball, more be favorable to improving the reliability, and be equipped with the intercommunication passageway alone, be favorable to improving the through-flow area, guarantee the through-flow effect.

Furthermore, the piston main body comprises a front piston body and a rear piston body, the guide hole is provided with a front hole section and a rear hole section, the front hole section is arranged on the front piston body, the rear hole section is arranged on the rear piston body, the front hole section is arranged in a penetrating manner from front to back, and the front end of the front hole section is used for forming an air inlet.

Has the advantages that: the piston main body is formed by a front piston body and a rear piston body, and the valve ball is convenient to install.

Furthermore, the front end of the front hole section is provided with a circle of front protruding part, the front protruding part protrudes towards the inner side of the front hole section to form a front limiting structure, and when the valve ball is pressed against the front limiting structure, the valve ball is in a closed position.

Has the advantages that: the front limiting structure can be directly processed on the front piston body, the structure is simple, and the processing is convenient.

Furthermore, the rear hole section penetrates through the rear piston body backwards, a circle of rear protruding part is arranged at the rear end of the rear hole section, and the rear protruding part protrudes towards the inner side of the rear hole section;

the rear protruding part forms a rear limiting structure, the rear limiting structure is used for limiting the backward movement of the valve ball, and when the valve ball is pressed against the rear limiting structure, the valve ball is in an open position.

Has the advantages that: when guaranteeing valve ball activity space, can reduce the thickness of back piston body, simple structure can directly process out back limit structure on the piston body of back moreover, prevents that the valve ball from droing, and processing is convenient moreover.

Furthermore, a smooth transition structure is formed between the front side face and the outer peripheral face of the rear piston body, and the diameter of the rear end face of the front piston body is not larger than that of the front end face of the rear piston body.

Has the advantages that: the piston main body is conveniently installed in the corresponding cylinder, and when the piston main body reciprocates in the cylinder, friction with the cylinder wall of the cylinder can be reduced.

Further, when the valve ball is in the closed position, a portion of the valve ball is exposed to the outside of the air inlet.

Has the advantages that: the requirement of the one-way through-flow function of the one-way valve is met, and the size of the piston main body is reduced.

Further, the valve ball is a hollow ball.

Has the advantages that: the weight of the valve ball is reduced, so that the valve ball can be stressed to move upwards more easily, and the one-way valve can be opened smoothly.

Furthermore, the communication channel is evenly distributed with two in the circumferential direction of the guide hole.

Has the advantages that: the flow area is increased, and the use requirement of large flow is met.

The GIS adopts the following technical scheme:

a GIS comprising:

a fast grounding switch;

the quick grounding switch comprises:

the moving contact is used for realizing switching on and switching off with the corresponding static contact;

a cylinder in which a piston is fitted in a sliding seal;

the piston is synchronously moved with the moving contact and is used for being matched with the cylinder to generate arc extinguishing airflow during brake opening;

the piston is provided with a one-way valve structure, and the one-way valve structure is used for communicating the spaces on two sides of the piston when the switch is switched on;

a one-way valve structure comprising:

the piston main body is provided with a front side and a rear side which respectively correspond to the closing direction and the opening direction of a moving contact of the high-voltage switch;

the piston main body is provided with a guide hole, the front end of the guide hole forms an air inlet, and the air inlet is used for allowing air in the front space of the piston main body to enter the one-way valve;

the valve ball is arranged in the guide hole in a guiding manner along the front-back direction, the valve ball is provided with a closing position and an opening position which respectively correspond to the two tail ends of the guide stroke of the valve ball, the closing position is positioned at the front end of the guide hole, the opening position is positioned at the rear end of the guide hole, and the valve ball blocks the air inlet to close the one-way valve when in the closing position;

and the communicating channel is provided with a front channel port and a rear channel port, the rear channel port is communicated with the rear space of the piston main body and is used for forming an air outlet, the front channel port is communicated with the guide hole, and when the valve ball is in an opening position, the front channel port is communicated with the air inlet.

Has the advantages that: a piston which moves synchronously with the moving contact is arranged in a cylinder of the quick grounding switch, so that pressure change is generated under the action of a gas piston of the cylinder, arc extinguishing airflow is formed through the hollow moving contact, and a one-way valve is arranged on the piston, so that gas on two sides of the piston is conducted during closing, and closing operation is facilitated; the piston body is provided with a guide hole, the valve ball is arranged in the guide hole in a guiding manner, when the valve ball moves backwards to the rear end of the guide hole, the valve ball enters an opening position, the air inlet is communicated with the communicating channel, the check valve is opened, and the air in the front space of the piston body can enter the rear space of the piston body from the air outlet in the piston body; when the valve ball moves forward to the front end of guiding hole, the valve ball gets into closed position, the air inlet is plugged up in order to close the check valve, whole check valve simple structure, rely on the front and back activity of valve ball to realize opening or closing of check valve, use good reliability, and because the valve ball direction sets up in the guiding hole, the valve ball motion is stable, the effect that pressure can be better is on the valve ball, more be favorable to improving the reliability, and be equipped with the intercommunication passageway alone, be favorable to improving the through-flow area, guarantee the through-flow effect.

Furthermore, the piston main body comprises a front piston body and a rear piston body, the guide hole is provided with a front hole section and a rear hole section, the front hole section is arranged on the front piston body, the rear hole section is arranged on the rear piston body, the front hole section is arranged in a penetrating manner from front to back, and the front end of the front hole section is used for forming an air inlet.

Has the advantages that: the piston main body is formed by a front piston body and a rear piston body, and the valve ball is convenient to install.

Furthermore, the front end of the front hole section is provided with a circle of front protruding part, the front protruding part protrudes towards the inner side of the front hole section to form a front limiting structure, and when the valve ball is pressed against the front limiting structure, the valve ball is in a closed position.

Has the advantages that: the front limiting structure can be directly processed on the front piston body, the structure is simple, and the processing is convenient.

Furthermore, the rear hole section penetrates through the rear piston body backwards, a circle of rear protruding part is arranged at the rear end of the rear hole section, and the rear protruding part protrudes towards the inner side of the rear hole section;

the rear protruding part forms a rear limiting structure, the rear limiting structure is used for limiting the backward movement of the valve ball, and when the valve ball is pressed against the rear limiting structure, the valve ball is in an open position.

Has the advantages that: when guaranteeing valve ball activity space, can reduce the thickness of back piston body, simple structure can directly process out back limit structure on the piston body of back moreover, prevents that the valve ball from droing, and processing is convenient moreover.

Furthermore, a smooth transition structure is formed between the front side face and the outer peripheral face of the rear piston body, and the diameter of the rear end face of the front piston body is not larger than that of the front end face of the rear piston body.

Has the advantages that: the piston main body is conveniently installed in the corresponding cylinder, and when the piston main body reciprocates in the cylinder, friction with the cylinder wall of the cylinder can be reduced.

Further, when the valve ball is in the closed position, a portion of the valve ball is exposed to the outside of the air inlet.

Has the advantages that: the requirement of the one-way through-flow function of the one-way valve is met, and the size of the piston main body is reduced.

Further, the valve ball is a hollow ball.

Has the advantages that: the weight of the valve ball is reduced, so that the valve ball can be stressed to move upwards more easily, and the one-way valve can be opened smoothly.

Furthermore, the communication channel is evenly distributed with two in the circumferential direction of the guide hole.

Has the advantages that: the flow area is increased, and the use requirement of large flow is met.

Drawings

Fig. 1 is a schematic structural diagram of a closing state of a fast grounding switch in the present invention;

FIG. 2 is a schematic view of the valve ball in the closed position;

FIG. 3 is a schematic perspective cross-sectional view of the piston of FIG. 1;

FIG. 4 is a top view of the piston of FIG. 1;

FIG. 5 is a schematic structural diagram of the rapid grounding switch of the present invention in the open state;

FIG. 6 is a schematic diagram of the closing process of the fast grounding switch in the present invention;

FIG. 7 is a schematic view of the valve ball in the open position;

fig. 8 is a schematic diagram of the opening process of the fast grounding switch in the present invention.

The names of the components corresponding to the corresponding reference numerals in the drawings are:

the structure comprises a movable contact 1, a fixed contact 2, an operating mechanism driving rod 3, a switch shell 4, a shielding conductor 5, a cylinder 6, a piston 7, an air hole 21, a rear piston body 71, a front piston body 72, a guide hole 73, a communication channel 74, an air inlet 75, an air outlet 76, a rear limiting structure 77, a front limiting structure 78 and a valve ball 8.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, which may be present in the embodiments of the present invention, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the recitation of "comprising an … …" may occur without the exclusion of additional like elements present in the process, method, article, or apparatus that comprises the element.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

The present invention will be described in further detail with reference to examples.

Embodiment 1 of the fast grounding switch in the present invention:

as shown in fig. 1, the fast grounding switch includes a cylinder 6, arc extinguishing gas is filled in the cylinder 6, the cylinder 6 is fixedly connected to a switch housing 4, an inner cavity of the cylinder 6 is communicated with a cavity in the switch housing 4, a moving contact 1 is arranged in the cylinder 6, a fixed contact 2 is arranged in the switch housing 4, the moving contact 1 is fixedly connected to an operating mechanism transmission rod 3, and the operating mechanism transmission rod 3 is used for driving the moving contact 1 and the fixed contact 2 to be connected or separated, so as to realize the switching-on and switching-off actions of the fast grounding switch.

And a shielding conductor 5 is also arranged at the communication part of the inner cavity of the cylinder 6 and the inner cavity of the switch shell 4, and the shielding conductor 5 is used for shielding the contact part of the movable contact 1 between the cylinder 6 and the switch shell 4.

To describe the present embodiment more clearly, the up-down direction in fig. 1 is taken as the front-back direction of the fast grounding switch, the closing direction of the moving contact 1 of the fast grounding switch is forward, and the opening direction is backward.

The rear end of the moving contact 1 is fixedly connected with an operating mechanism transmission rod 3, the operating mechanism transmission rod 3 drives the moving contact 1 to move back and forth, move backwards to be far away from the static contact 2, and move forwards to be close to the static contact 2, so that the action of opening and closing is realized.

The moving contact 1 is fixedly connected with a piston 7, the piston 7 is provided with an assembly hole, the piston 7 is sleeved on the moving contact 1 through the assembly hole, the moving contact 1 can drive the piston 7 to move back and forth, and the piston 7 is in sliding sealing fit with the inner wall of the cylinder 6. The moving contact 1 is of a hollow structure and is provided with an opening facing the front, the rear part of the moving contact 1 is provided with an air hole 21, the air hole 21 is positioned behind the piston 7, and the air hole 21 is used for communicating the space at the rear part of the piston 7 with a cavity in the moving contact 1.

As shown in fig. 1, 2, 3 and 4, the piston 7 includes a piston body having a front side and a rear side corresponding to a closing direction and an opening direction, respectively, the piston body includes a rear piston body 71 and a front piston body 72, the rear piston body 71 and the front piston body 72 are welded together, the rear piston body 71 and the front piston body 72 are both formed in a ring shape, and a central hole thereof is used for forming an assembly hole of the piston 7. The front end face and the outer peripheral face of the rear piston body 71 are in smooth transition, and the diameter of the rear end face of the front piston body 72 is not larger than that of the front end face of the rear piston body, so that the friction between the piston 7 and the inner wall of the cylinder 6 can be reduced when the piston reciprocates in the cylinder 6.

Be equipped with the check valve structure on the piston 7, the check valve structure includes valve ball 8, back piston body 71 and preceding piston body 72, and the equipartition is equipped with four holes along circumference on the back piston body 71 to form the back hole section, and the equipartition is equipped with four holes along circumference on the preceding piston body 72 to form the preceding hole section, and the back hole section corresponds around with the preceding hole section one by one, in order to form guiding hole 73.

The valve ball 8 is a hollow ball, and is arranged in the guide hole 73 in a front-back guiding mode. The guiding hole 73 is arranged to run through from front to back, a circle of protruding part is arranged at the rear end of the guiding hole 73 and used for forming a rear limiting structure 77, and a circle of protruding part is also arranged at the front hole of the guiding hole 73 and used for forming a front limiting structure 78. The rear limiting structure 77 and the front limiting structure 78 are used for limiting the forward and backward movement of the valve ball 8, preventing the valve ball 8 from falling out of the guide hole 73, and when the valve ball 8 moves forward to the front limiting structure 78, the front end hole of the guide hole 73 can be blocked, and the valve ball 8 enters the closing position of the moving stroke of the valve ball 8, so that the one-way valve is closed.

When the valve ball 8 moves forward to the front stopper 78, a part of the valve ball 8 is exposed forward out of the guide hole 73, which contributes to reducing the thickness dimension of the front piston body 72. When the valve ball 8 moves rearward onto the rear stopper 77, a portion of the valve ball 8 is exposed rearward out of the guide hole 73, which is advantageous in reducing the thickness dimension of the rear piston body 71. The reduction in the thickness of the rear piston body 71 and the thickness of the front piston body 72 reduces the weight of the piston 7, thereby reducing the closing operation.

Two sides of the radial direction of the guide hole 73 are respectively provided with two communicating channels 74, each communicating channel 74 is of an L-shaped hole structure and comprises a front extending section, a rear extending section, an extending section and an arc transition section, the extending sections are perpendicular to the front and rear directions and are formed in the rear piston body 71, each communicating channel 74 is provided with a front channel opening and a rear channel opening, the rear channel openings and rear orifices of the guide hole 73 are arranged at intervals, the rear channel openings are communicated with the space at the rear part of the rear piston body 71 and used for forming an air outlet 76, and the front channel openings are communicated with the guide hole 73. As shown in fig. 7, when the valve ball 8 moves backward onto the rear stopper structure 77 so that the front end orifice of the guide hole 73 communicates with the front passage port of the communication passage 74, the valve ball 8 enters the open position of its movable stroke to open the check valve, and the gas in the front space of the check valve can enter the rear space of the check valve through the check valve.

When the fast grounding switch works, as shown in fig. 5 and fig. 2, when the fast grounding switch is in a switching-off state, the moving contact 1 is separated from the static contact 2, the gas pressure in the spaces at the front side and the rear side of the piston 7 is balanced, the valve ball 8 falls on the front limit structure 78 due to the self-weight, and at this time, the valve ball 8 is in a closed position.

When the quick grounding switch is switched on, as shown in fig. 6 and 7, the moving contact 1 moves forward to drive the piston 7 to move forward, the piston 7 compresses gas in the front space of the piston 7, the air pressure in the front part of the piston 7 gradually rises, when the pressure is high enough, the valve ball 8 moves backward to separate from the closed position to enter the open position, so that the front end orifice of the guide hole 73 is communicated with the front channel opening of the communication channel 74, the front end orifice of the guide hole 73 forms an air inlet 75, the air inlet 75 is communicated with the air outlet 76, so that the spaces on the front side and the rear side of the piston 7 are communicated, the compressed gas in the front space of the piston 7 can enter the rear space of the piston 7 through the one-way valve, thereby equalizing the pressure and reducing the switching-on operation function of the operating mechanism.

The moving contact 1 is connected with the static contact 2 to complete the switching-on process, the air pressure of the spaces at the front side and the rear side of the piston 7 tends to be balanced, the valve ball 8 moves forwards, and the quick grounding switch enters the switching-on state shown in figure 1.

When the rapid grounding switch is in a brake-off process, as shown in fig. 8 and 2, the movable contact 1 moves backwards to drive the piston 7 to move backwards, the piston 7 compresses gas in a space at the rear of the piston 7, the gas pressure at the rear of the piston 7 is increased, the valve ball 8 is pressed against the front limiting mechanism 78 under the action of the gas pressure at the rear, the valve ball 8 is in a closed position to block a lower end orifice of the guide hole 73, so that the space at the front of the piston 7 is separated from the space at the rear of the piston 7, the gas at the rear of the piston 7 enters a cavity in the movable contact 2 through the gas hole 21 under the action of pressure difference, and is ejected from an opening at the front end of the movable contact 2, and gas flow is formed between fractures at the separation position of the movable contact 1 and the fixed contact 2 to take away arc heat and metal particles, so that clean arc-extinguishing gas in the cylinder 6 is filled into the fracture area to realize blowing arc-extinguishing.

After the opening, the air pressure in the front and rear side spaces of the piston 7 tends to be balanced, and the quick grounding switch returns to the opening state shown in fig. 5.

The used check valve of quick earthing switch in this embodiment simple structure relies on the back and forth activity of valve ball 8 to realize opening or closing of check valve, and the use good reliability, and because the direction setting of valve ball 8 is in the guiding hole, the pressure that piston main part front portion or rear portion can be better is used on the valve ball, and valve ball 8 motion is stable, more is favorable to improving the reliability, is equipped with intercommunication passageway 74 moreover alone, is favorable to improving the through-flow area, guarantees the through-flow effect.

Embodiment 2 of the fast grounding switch in the present invention:

the difference between this embodiment and embodiment 1 is that the piston in embodiment 1 includes a rear piston body and a front piston body, and is used to form a piston main body of the check valve, a circle of protrusion is provided at a rear end orifice of a rear hole section of the rear piston body, and is used to form a rear limit mechanism, and a circle of protrusion is also provided at a front end orifice of a front hole section of the front piston body, and is used to form a front limit mechanism, so as to limit the valve ball guided and movably disposed in the guide hole.

Embodiment 3 of the fast grounding switch in the present invention:

the present embodiment is different from embodiment 1 in that the communication passage in embodiment 1 is an integral L-shaped hole, which is entirely disposed in the rear piston body, whereas in the present embodiment, a vertical communication hole is provided in the rear piston body adjacent to the rear hole section, and a communication groove is provided in the front piston body, a notch of the communication groove faces rearward and one side of the communication groove communicates with the front hole section of the guide hole, and the communication groove is used to form a communication passage with the communication hole.

Embodiment 4 of the fast grounding switch in the present invention:

the present embodiment is different from embodiment 1 in that the communication passage in embodiment 1 is an L-shaped hole structure, whereas in the present embodiment, the communication passage is an inclined hole structure.

Embodiment 5 of the fast grounding switch in the present invention:

the present embodiment is different from embodiment 1 in that the communication passage in embodiment 1 is provided at two places, whereas in the present embodiment, in the case where the through-flow requirement is satisfied, the communication passage is provided at one place. In other embodiments, more than three communication channels may be provided.

Embodiment 6 of the fast grounding switch in the present invention:

the difference between this embodiment and embodiment 1 is that the front limiting structure in embodiment 1 is formed by a ring of protruding part at the front end of the guide hole, and in this embodiment, the front end of the guide hole has a section of reduced diameter hole, and the reduced diameter hole is used for forming the front limiting structure. In other embodiments, a reducing structure may be disposed at the front end of the guide hole, and the rear side surface of the reducing structure is a spherical structure matched with the spherical surface of the valve ball.

Embodiment 7 of the fast grounding switch in the present invention:

the difference between this embodiment and embodiment 1 is that the front piston body and the rear piston body in embodiment 1 are welded, but in this embodiment, the front piston body and the rear piston body are connected by screws, and in other embodiments, they can also be connected by rivets.

The invention relates to an embodiment of a piston one-way valve structure for a high-voltage switch, which comprises the following steps:

the embodiment of the piston check valve structure for the high-voltage switch is the same as the check valve structure described in any one of embodiments 1 to 7 of the above-described quick grounding switch, and will not be described in detail here.

It should be noted that the check valve structure in this embodiment is used on a piston in a cylinder of a fast grounding switch, and in other embodiments, the check valve structure may be used on other switches, such as an arc extinguishing chamber of a circuit breaker.

The embodiment of the GIS of the invention:

the GIS includes a fast grounding switch, and the fast grounding switch in this embodiment has the same structure as the fast grounding switch described in any one of embodiments 1 to 7 of the fast grounding switch described above, and will not be described in detail here.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.