CN114628189A - Pneumatic arc extinguish chamber and circuit breaker - Google Patents

Abstract

The invention belongs to the field of high-voltage switchgear, and in particular relates to a compressed gas type arc extinguishing chamber and a circuit breaker. The circuit breaker includes an operating mechanism and an arc extinguishing chamber. The arc extinguishing chamber includes a pressure cylinder and a piston arranged at the rear of the pressure cylinder. There is a compressing chamber inside, and the compressing chamber is movably provided with a partition plate along the front and rear directions. The air flow channel is provided with a seal located on the front side of the partition plate, the seal can close and open the air flow channel, and can be pushed to the closed position when the first part is compressed, and pushed to the open position when the second part is compressed, The partition plate is pushed by the elastic member, and at least one of the inner wall of the first part and the partition plate is provided with a spacer holding structure facing the other, so that by arranging the partition plate and the corresponding control structure in the compressed air, it is possible to increase the extinguishing effect. While improving the arc extinguishing capability of the arc chamber, it avoids excessive influence on the external dimensions of the arc extinguishing chamber.

Description

A compressed gas arc extinguishing chamber and circuit breaker

technical field

The invention belongs to the field of high-voltage switchgear, and in particular relates to a compressed gas type arc extinguishing chamber and a circuit breaker.

Background technique

The circuit breaker is the key equipment used for the control and protection of the power system. Its core working element is the arc extinguishing chamber. When a short-circuit current occurs in the line, the arc extinguishing chamber needs to act quickly to isolate the faulty part from the power grid. In the process of breaking the short-circuit current, an arc will appear at the fracture of the arc-extinguishing chamber, and the short-circuit current needs to be extinguished to successfully cut off the short-circuit current.

For ultra-high-voltage circuit breakers of 550kV and above, the short-circuit current is relatively large, and the recovery voltage after arc extinguishing is relatively high. For such circuits, the arc-extinguishing chamber generally adopts a compressed gas-type arc-extinguishing chamber, such as the authorization announcement number CN207302930U, The authorization announcement date is May 01, 2018 Chinese utility model patent discloses an arc extinguishing chamber for a circuit breaker load switch. The arc extinguishing chamber includes a static arc contact, a static main contact, a nozzle, a moving main contact, a dynamic Arc contact, piston, cylinder and pulling tube (also called piston rod and operating rod), wherein the cylinder, piston and pulling tube cooperate to form a compression chamber, and the cylinder and pulling tube can slide relative to the piston to change the volume of the compression chamber. When the brake is opened, the pulling tube with the moving arc contact, the moving main contact and the cylinder moves away from the static arc contact and the static main contact relative to the piston, and the pressure chamber is compressed, so that the gas in the pressure chamber forms high pressure and high speed. The airflow is blown to the arc between the moving arc contact and the static arc contact, and the arc is blown out to achieve breaking. During the actual opening, there will be short arcs, long arcs and intermediate arcs in between according to the arcing time. Moreover, the entire arcing interval is 9ms. Specifically, the shortest arcing time of the circuit breaker is defined as tarcmin. In the 50Hz system, the long arcing time tarcmax=tarcmin+9, the circuit breaker must have the arcing interval of tarcmin～tarcmax. Breaking capacity, it can be seen that the shortest arcing time directly determines the long arcing time. The shorter the arcing time, the faster the short-circuit fault is removed, the more timely the fault feeder can be isolated from the normal line, and the reliable guarantee The stability and reliability of the power grid system, and at the same time, the shorter the arcing time, the smaller the amount of contact ablation, the more conducive to improving the electrical life of the circuit breaker.

In order to shorten the shortest arcing time, the Chinese invention patent with the authorization announcement number of CN106328430B and the authorization announcement date of August 7, 2018 discloses an arc extinguishing chamber with a series pressure chamber, which is intended to improve the ability of the circuit breaker to break short-circuit current. , On the basis of the first compressing chamber, an additional second compressing chamber is set in series with the first compressing chamber, and the flow rate of the airflow blown out from the first compressing chamber is increased by the assistance of the second compressing chamber, so as to realize Improved breaking capability. However, since the outer diameter of the external pressure cylinder enclosing the second compressing chamber is larger than that of the internal pressure cylinder enclosing the first compressing chamber, and the second compressing chamber extends backward relative to the first compressing chamber, the arc extinguishing chamber has a larger diameter than that of the first compressing chamber. There is an increase in size both upwards and in the axial direction.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a compressed gas type arc extinguishing chamber to solve the technical problem of increasing the overall size of the arc extinguishing chamber when improving the arc extinguishing capacity and arc extinguishing speed of the arc extinguishing chamber in the prior art; Another object is to provide a circuit breaker using the above-mentioned compressive arc extinguishing chamber.

In order to achieve the above-mentioned purpose, the technical scheme of the compressed gas arc extinguishing chamber provided by the present invention is:

A pressurized arc extinguishing chamber, comprising a pressurizing cylinder and a piston arranged at the rear of the pressurizing cylinder, a pressurizing chamber is arranged in the pressurizing cylinder, and a partition plate is movably arranged in the pressurizing chamber along the front-rear direction, and the dividing plate is The baffle divides the compressing chamber into a first part on the front side and a second part on the rear side, and is provided with an air flow channel connecting the first part and the second part, and an on-off control assembly is arranged at the air flow channel, and the air flow channel is The breaking control assembly includes a sealing member arranged on the front side of the partition plate, the sealing member has an open position for opening the air flow passage and a closed position for closing the air flow passage. During the opening process of the arc extinguishing chamber, the sealing member is sealed When the first part is compressed, it can be driven to move to the closed position by air pressure, and when the second part is compressed, the corresponding air flow channel is opened, and the partition plate is configured with an elastic member that provides a forward thrust to it, so At least one of the inner wall of the first part and the partition plate is provided with a spacer-holding structure facing the other, for leaving the seal between the inner wall of the first part opposite the partition plate and the partition plate to be closed by the seal. Space for bit-to-open switching.

The beneficial effect is: when the gate is opened, the partition plate is kept in position under the thrust of the elastic member, and the first part of the compressing chamber on the front side is compressed, so that the air pressure in the first part of the compressing chamber is increased, and the increased air pressure pushes the The seal closes the airflow passage and separates the first part from the second part so that the gas in the first part does not flow into the second part when compressed, so that the air pressure in the first part rises at a more rapid rate. Generate higher-speed airflow, improve the arc extinguishing chamber's ability to blow out the arc, and shorten the shortest arc time. When the inner wall of the first part is in contact with the partition plate through the spacer holding structure, the partition plate can be pushed back against the thrust of the elastic member through the spacer holding structure, compressing the second part of the air chamber, and the air pressure in the second part is increased Then push the seal to the open position, and the high-pressure and high-speed airflow in the second part is blown to the arcing position through the airflow channel to realize the blowing out of the long arc. Such an arc extinguishing chamber can reduce the shortest arcing time, thereby shortening the The long arcing time enables the corresponding circuit breaker to achieve faster breaking, and in order to achieve the above effects, the components formed by the partition plate and the seal are arranged inside the compressing chamber, compared to adding a series of plenums outside the compressing chamber , such a structure will not cause too much influence on the size of the arc extinguishing chamber.

As a further improvement, the sealing element is a translational sealing element that can translate in the front-rear direction.

The beneficial effect is that: the sealing member adopts a translation type, so that the sealing member only needs to move and change the position during the working process. Compared with realizing the opening and closing of the airflow channel through deformation, the translation makes the sealing member more durable, thereby ensuring that the sealing member is more durable. The arc chute is more durable.

As a further improvement, the sealing element is guided fit with the inner wall of the first part and/or the partition plate.

The beneficial effects are: the sealing element has a definite movement track, which can ensure that the sealing element can accurately and reliably block the airflow passage, thereby ensuring that the arc-extinguishing chamber has reliable working performance.

As a further improvement, the front side of the partition plate is provided with a guide column, the sealing member and the partition plate are guided and matched by the guide column, and the interval maintaining structure is formed by the guide column.

The beneficial effects are: the guide column is used to guide the movement of the seal, and at the same time, as an interval maintaining structure, one part plays two roles, and no additional special interval maintaining structure is required, so that the arc-extinguishing chamber has the simplest possible structure.

As a further improvement, the front end of the guide column is provided with a stop portion, which is used to prevent the seal from separating from the partition plate.

The beneficial effect is that the stopper is directly integrated on the guide column to ensure that the seal will not be separated from the working area, and there is no need to provide additional stopper for the seal, thereby ensuring that the structure of the arc extinguishing chamber is as simple as possible.

As a further improvement, the guide column includes a thread segment at the rear end that is threadedly matched with the dividing plate, a guide segment at the front end of the thread segment, and a stop segment at the front end of the guide segment that forms the stop portion. The diameter is larger than the diameter of the guide segment, and the diameter of the guide segment is larger than the diameter of the thread segment.

The beneficial effect is that the guide column is arranged in a stepped shaft structure and has an installation structure, a guide structure and a stop part at the same time, so that the guide column has more functions and is also convenient for production.

As a further improvement, the elastic member is a support spring, and the support spring is installed between the partition plate and the piston.

The beneficial effects are: the piston in the arc-extinguishing chamber is a fixed part, and the use of the piston can provide reliable support for the support spring, and there is no need to additionally provide a structure for supporting the support spring on other structures, thereby improving the design and production efficiency of the arc-extinguishing chamber. Convenience.

As a further improvement, the support spring is a coil spring, and the piston is provided with a positioning groove into which the end of the coil spring is inserted.

The beneficial effect is that the space occupied by the coil spring in the second part is smaller, and the excessive influence on the volume of the compressed air chamber due to the provision of the elastic piece is avoided. The coil spring is stably in the working position, avoiding the displacement of the coil spring during the working process and causing the thrust deflection provided to the partition plate to cause the partition plate to be stuck during the movement process, so as to ensure the reliable working performance of the arc-extinguishing chamber.

As a further improvement, the air flow channel is formed by a group of holes provided on the partition plate.

The beneficial effect is that: the air flow channel is composed of a hole group, which is more convenient to arrange the sealing element than a single large-diameter air hole.

To achieve the above purpose, the technical scheme of the circuit breaker provided by the present invention is:

A circuit breaker includes an operating mechanism and an arc-extinguishing chamber drivingly connected with the operating mechanism, the arc-extinguishing chamber includes a pressure cylinder and a piston arranged at the rear of the pressure cylinder, and a pressure chamber is arranged in the pressure cylinder, so the The plenum is provided with a partition plate movably in the front-rear direction, the partition plate divides the plenum into a first part on the front side and a second part on the rear side, and is provided with a connecting plate connecting the first part and the second part. an air flow channel, an on-off control assembly is arranged at the air flow channel, and the on-off control assembly includes a sealing member arranged on the front side of the partition plate, and the sealing member has an opening position for opening the air flow channel and closing the air flow channel. When the first part is compressed, the seal can be driven to move to the closed position by air pressure, and when the second part is compressed, the corresponding airflow channel is opened, so The partition plate is configured with an elastic member that provides a forward thrust therefor, and at least one of the inner wall of the first part and the partition plate is provided with a spaced-holding structure facing the other for the purpose of connecting the first part to the partition plate. A space for the sealing member to switch from the closed position to the open position is reserved between the opposite inner walls of the plates and the partition plate.

The beneficial effect is: when the gate is opened, the partition plate is kept in position under the thrust of the elastic member, and the first part of the compressing chamber on the front side is compressed, so that the air pressure in the first part of the compressing chamber is increased, and the increased air pressure pushes the The seal closes the airflow passage and separates the first part from the second part so that the gas in the first part does not flow into the second part when compressed, so that the air pressure in the first part rises at a more rapid rate. Generate higher-speed airflow, improve the arc extinguishing chamber's ability to blow out the arc, and shorten the shortest arc time. When the inner wall of the first part is in contact with the partition plate through the spacer holding structure, the partition plate can be pushed back against the thrust of the elastic member through the spacer holding structure, compressing the second part of the air chamber, and the air pressure in the second part is increased Then push the seal to the open position, and the high-pressure and high-speed airflow in the second part is blown to the arcing position through the airflow channel to realize the blowing out of the long arc. Such an arc extinguishing chamber can reduce the shortest arcing time, thereby shortening the The long arcing time enables the corresponding circuit breaker to achieve faster breaking, and in order to achieve the above effects, the components formed by the partition plate and the seal are arranged inside the compressing chamber, compared to adding a series of plenums outside the compressing chamber , such a structure will not cause too much influence on the size of the arc extinguishing chamber.

As a further improvement, the sealing element is a translational sealing element that can translate in the front-rear direction.

The beneficial effect is that: the sealing member adopts a translation type, so that the sealing member only needs to move and change the position during the working process. Compared with realizing the opening and closing of the airflow channel through deformation, the translation makes the sealing member more durable, thereby ensuring that the sealing member is more durable. The arc chute is more durable.

As a further improvement, the sealing element is guided fit with the inner wall of the first part and/or the partition plate.

The beneficial effects are: the sealing element has a definite movement track, which can ensure that the sealing element can accurately and reliably block the airflow passage, thereby ensuring that the arc-extinguishing chamber has reliable working performance.

As a further improvement, the front side of the partition plate is provided with a guide column, the sealing member and the partition plate are guided and matched by the guide column, and the interval maintaining structure is formed by the guide column.

The beneficial effects are: the guide column is used to guide the movement of the seal, and at the same time, as an interval maintaining structure, one part plays two roles, and no additional special interval maintaining structure is required, so that the arc-extinguishing chamber has the simplest possible structure.

As a further improvement, the front end of the guide column is provided with a stop portion, which is used to prevent the seal from separating from the partition plate.

The beneficial effect is that the stopper is directly integrated on the guide column to ensure that the seal will not be separated from the working area, and there is no need to provide additional stopper for the seal, thereby ensuring that the structure of the arc extinguishing chamber is as simple as possible.

As a further improvement, the guide column includes a thread segment at the rear end that is threadedly matched with the dividing plate, a guide segment at the front end of the thread segment, and a stop segment at the front end of the guide segment that forms the stop portion. The diameter is larger than the diameter of the guide segment, and the diameter of the guide segment is larger than the diameter of the thread segment.

The beneficial effect is that the guide column is arranged in a stepped shaft structure and has an installation structure, a guide structure and a stop part at the same time, so that the guide column has more functions and is also convenient for production.

As a further improvement, the elastic member is a support spring, and the support spring is installed between the partition plate and the piston.

The beneficial effects are: the piston in the arc-extinguishing chamber is a fixed part, and the use of the piston can provide reliable support for the support spring, and there is no need to additionally provide a structure for supporting the support spring on other structures, thereby improving the design and production efficiency of the arc-extinguishing chamber. Convenience.

As a further improvement, the support spring is a coil spring, and the piston is provided with a positioning groove into which the end of the coil spring is inserted.

The beneficial effect is that the space occupied by the coil spring in the second part is smaller, and the excessive influence on the volume of the compressed air chamber due to the provision of the elastic piece is avoided. The coil spring is stably in the working position, avoiding the displacement of the coil spring during the working process and causing the thrust deflection provided to the partition plate to cause the partition plate to be stuck during the movement process, so as to ensure the reliable working performance of the arc-extinguishing chamber.

As a further improvement, the air flow channel is formed by a group of holes provided on the partition plate.

The beneficial effect is that: the air flow channel is composed of a hole group, which is more convenient to arrange the sealing element than a single large-diameter air hole.

Description of drawings

1 is a schematic structural diagram of the arc-extinguishing chamber of Embodiment 1 of the circuit breaker in the present invention when it is in a closed state;

Fig. 2 is a partial enlarged view at A in Fig. 1;

3 is a schematic diagram of the state of the arc-extinguishing chamber of Embodiment 1 of the circuit breaker in the present invention when it is in the initial stage of opening;

4 is a schematic diagram of the state of the arc extinguishing chamber of Embodiment 1 of the circuit breaker in the present invention when it is in a short arcing position;

5 is a schematic diagram of the state of the arc extinguishing chamber of Embodiment 1 of the circuit breaker in the present invention when it is in a long arc position;

Fig. 6 is a partial enlarged view at B in Fig. 5;

Tag Description:

1. Static main contact; 2. Static arc contact; 3. Piston rod; 4. Pressure cylinder; 5. Moving main contact; 6. Dynamic arc contact; 7. Piston; 8. Connecting body; 9. Fixed Connection structure; 10, air outlet; 11, spout; 12, partition plate; 13, first part; 14, second part; 15, air guide hole; 16, valve plate; 17, guide column; 18, coil spring; 19 , stomata.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

It should be noted that relational terms such as "first" and "second" that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no actual relationship or order between entities or operations. Furthermore, terms such as "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or apparatus that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent in such a process, method, article or apparatus. Without further limitation, an element defined by the phrase "includes a..." etc. does not exclude a process, method, that includes the element.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the term "provided" that may appear should be understood in a broad sense. It is arranged separately from the body and connected to the body, and the connection can be detachable or non-detachable. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

The present invention will be further described in detail below in conjunction with the embodiments.

The specific embodiment 1 of the circuit breaker provided by the present invention:

The circuit breaker provided in this embodiment includes an operating mechanism, and an arc-extinguishing chamber that is drive-connected to the operating mechanism and is driven by the operating mechanism to open and close. During operation, the circuit breaker and conduction are realized through the switch of the arc-extinguishing chamber. pass control. Specifically, the partial structure of the arc extinguishing chamber is shown in Figure 1, including a static end on the front side and a moving end on the rear side. The static end specifically includes a static main contact 1 and a static arc contact 2, and the moving end includes a piston rod 3. , Pressure cylinder 4, moving main contact 5, moving arc contact 6. The pressure cylinder 4 is provided with an annular sleeve piston rod 3, and is connected by a connecting body 8 to form an annular space between the two, a piston 7 is arranged on the rear side of the annular space, and the piston 7 is in sealing fit with the piston rod 3. The outer peripheral surface of the piston 7 is in sliding sealing fit with the inner wall surface of the pressure cylinder 4 , and the pressure cylinder 4 , the piston rod 3 , the connecting body 8 and the piston 7 form a pressure chamber.

The piston 7 is fixed on the corresponding structure through the fixed connection structure 9, so that the whole composed of the piston rod 3, the pressure cylinder 4, the moving contact 5, the moving arc contact 6 and the connecting body 8 can be far away from the static end and the connecting body 8 relative to the piston 7. The movement towards the static end realizes the compression and expansion of the compressed air chamber. In order to ensure that the gas in the compressed air chamber can be compressed to form a high-speed airflow that blows toward the arc, an air outlet 10 is also opened on the connecting body 8 . In order to guide the flow direction of the airflow, the moving end is also provided with a nozzle 11 . Specifically, the piston rod 3 is connected with the operating mechanism, and the operating mechanism drives the integral movement of the piston rod 3 , the pressure cylinder 4 , the moving contact 5 , the moving arc contact 6 and the connecting body 8 .

In order to increase the short arc blowing pressure of the arc extinguishing chamber, the arc extinguishing chamber further includes a partition plate 12 arranged in the compressing chamber. As shown in FIG. Sealing and sliding fit, at the same time, the outer peripheral surface of the partition plate 12 and the inner wall surface of the pressure cylinder 4 slide and guide fit, the partition plate 12 divides the pressure chamber into two parts, the front side is the first part 13, and the rear side is the second part 14. In order to communicate the first part 13 and the second part 14 , the partition plate 12 is also provided with a hole group formed by a plurality of air guide holes 15 , and the hole group acts as an air flow channel to conduct the first part 13 and the second part 14 . A valve plate 16 is arranged corresponding to the hole group, and the valve plate 16 is used as a sealing member to control the opening and closing of the air passage.

Specifically, the valve plate 16 is installed on the front side of the partition plate 12 through a guide column 17, and the guide column 17 is a stepped shaft structure whose diameter gradually decreases from front to back. The adjacent threaded section is the guide section, and the foremost section is the stop section. Correspondingly, the valve plate 16 is provided with a guide hole, which guides and cooperates with the guide section of the guide column. When installing, pass the rear end of the guide column 17 through the valve. The guide hole of the plate 16 is screwed on the partition plate 12, the valve plate 16 can move back and forth in cooperation with the guide section of the guide column 17, and the valve plate is prevented from coming out of the installation position through the stop cooperation between the stop section and the valve plate 16. When When the valve sheet 16 is in a position where it is in contact with the partition plate 12, the valve sheet 16 closes the corresponding air guide hole 15, and this position is the closed position of the seal. The corresponding air guide holes 15 are opened, and this position is the open position of the seal.

The arc-extinguishing chamber also includes an elastic member that provides a forward thrust for the partition plate 12. In this embodiment, the elastic member is a coil spring 18 arranged between the partition plate 12 and the piston 7, in order to position the coil spring 18 , the front side of the piston is provided with a positioning groove for the rear end of the coil spring 18 to be inserted into. When the compressing chamber is not compressed, the partition plate is limited to the short arc position by the elastic member, that is, the arc can be extinguished after the first part is compressed. As for the elastic member, in other embodiments, it can also be a disc spring, and of course it can also be a rubber member, a gas spring, or the like.

When working, as shown in Figure 1, the arc extinguishing chamber is in the closed state. When there is a short circuit in the line and other situations that need to be disconnected, the operating mechanism moves with the piston rod 3, the pressure cylinder 4, and the moving contact. The whole composed of the head 5, the moving arc contact 6 and the connecting body 8 moves backward, the first part 13 of the compression chamber is compressed, causing the gas pressure in the first part to rise, and the high pressure presses the valve plate 16 in the closed position, as shown in the figure 3 shown. With the continued movement of the piston rod 3, the gas in the first part 13 is unable to enter the second part 14, which causes the air pressure in the first part to rise rapidly, forming a high-speed airflow with a higher flow rate, and blowing through the air outlet 10 towards the The arc position, as shown in Figure 4, increases the blowing pressure of the short arc in the arc extinguishing chamber. Through this setting, the compression space of the compression chamber for short arc extinguishing can be reduced to 1/5 or even smaller than the original, making the compression chamber The pressure at the corresponding position can be increased to more than twice that of the traditional circuit breaker, greatly improving the arc blowing capacity, reducing the shortest arcing time, realizing efficient and fast arc extinguishing, shortening the shortest arcing time, and advancing the breaking interval of the circuit breaker.

After the connecting body 8 is in contact with the front end surface of the guide column 17, a space is left between the inner wall of the first part 13 and the partition plate 12 through the guide column, as shown in FIG. 5 and FIG. 12 is pushed back to compress the second part 14 of the plenum chamber, the air pressure in the second part 14 increases, based on the existence of the space between the inner wall of the first part 13 and the partition plate 12, the high pressure in the second part 14 The gas pushes the valve plate 16 forward to the open position through the air guide hole 15 , so that the high-pressure gas in the second part 14 can be blown to the arcing position through the air outlet 10 to realize the blowout of the long arc. Based on the shortening of the shortest arcing time, the long arcing time is also shortened. The piston rod 3 is also provided with an air hole 19, which can supply air to the air pressure chamber when closing.

The main difference between the specific embodiment 2 of the circuit breaker provided by the present invention and the embodiment 1 is that in the embodiment 1, the piston rod, the pressure cylinder, the moving main contact, and the moving arc contact are integrated. In this embodiment, the parts of the piston rod, the pressure cylinder, the moving main contact, and the moving arc contact are in an assembly relationship. Based on this, the pressure cylinder can be set to be relatively fixed to the piston, and the moving main contact is connected to the piston rod. And it is in sliding fit with the inner wall of the pressure cylinder. Based on the structure of the arc extinguishing chamber, an elastic member that provides thrust for the partition plate can also be arranged between the partition plate and the pressure cylinder.

The main difference between the specific embodiment 3 of the circuit breaker provided by the present invention and the embodiment 1 is that in the embodiment 1, the sealing member is arranged in the compressing chamber to move in the front-rear direction, and the sealing member can be opened and closed by moving. Bit position transformation. In this embodiment, the sealing member is an elastic member, such as a leather cup disposed at the mouth of the air flow channel, and the opening and closing of the air flow channel is realized through the deformation of the leather cup, that is, the deformation of the leather cup itself is used to open and close the air flow channel. Switch between closed positions.

The main difference between the specific embodiment 4 of the circuit breaker provided by the present invention and the embodiment 1 is that in the embodiment 1, the valve plate is installed on the partition plate in a guiding and movable manner. In this embodiment, the valve plate is guided and matched with the inner wall of the first part to realize the guiding and moving installation of the valve plate in the first part.

The main difference between the specific embodiment 5 of the circuit breaker provided by the present invention and the embodiment 1 is that in the embodiment 1, the spacer maintaining structure for maintaining the space between the partition plate and the inner wall of the first part is arranged in the part on the clapboard. In this embodiment, the spacing maintaining structure is a protrusion disposed on the connecting body 8 and protruding toward the partition plate. Of course, in other embodiments, the spacer maintaining structure may also be arranged on the inner wall of the piston rod or the pressing cylinder.

The main difference between the specific embodiment 6 of the circuit breaker provided by the present invention and the embodiment 1 is that in the embodiment 1, the guide column also has a blocking section to prevent the valve plate from leaving the working position. In this embodiment, a section of the guide column located on the front side of the partition plate is a guide section, and a soft connection is provided between the valve plate and the partition plate to prevent and restrain the valve plate from coming off.

The main difference between the specific embodiment 7 of the circuit breaker provided by the present invention and the embodiment 1 is that in the embodiment 1, the guide column is threadedly connected to the partition plate. In this embodiment, the guide post is press-fitted on the divider plate by interference fit between the guide post and the guide post fitting hole on the divider plate.

The main difference between the specific embodiment 8 of the circuit breaker provided by the present invention and the embodiment 1 is that in the embodiment 1, the air flow channel is formed by the group of holes on the partition plate. In this embodiment, a C-shaped long groove is opened on the partition plate as an air flow channel.

The embodiment of the compressed gas arc extinguishing chamber in the present invention:

The embodiment of the compressed gas arc extinguishing chamber is the arc extinguishing chamber described in any one of Embodiments 1 to 8 of the above circuit breaker, which will not be described in detail here.

Finally, it should be noted that the above descriptions are only 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 Modifications are made to the technical solutions described in the foregoing embodiments without creative labor, or equivalent replacements are made to some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a pneumatics formula explosion chamber, includes puffer cylinder (4) and locates piston (7) at puffer cylinder (4) rear portion, be equipped with the puffer chamber in the puffer cylinder (4), its characterized in that, movably division board (12) are equipped with along the fore-and-aft direction in the puffer chamber, division board (12) divide the puffer chamber into the first part (13) of front side and the second part (14) of rear side and be equipped with the intercommunication the air current passageway of first part (13) and second part (14), air current passageway department is equipped with the on-off control subassembly, the on-off control subassembly is including the sealing member of locating division board (12) front side, the sealing member has the open position of opening air current passageway and seals the closed position of air current passageway, in the explosion chamber separating brake in-process, the sealing member can be moved to closed position by pneumatic drive when first part (13) is compressed, when the second part (14) is compressed, the corresponding airflow channel is opened, the partition plate (12) is provided with an elastic piece for providing forward pushing force for the partition plate, at least one of the inner wall of the first part (13) and the partition plate (12) is provided with a spacing retaining structure facing the other, and a space for switching the sealing piece from a closed position to an open position is reserved between the inner wall of the first part (13) opposite to the partition plate (12) and the partition plate (12).

2. The puffer arc chute of claim 1, wherein the seal is a translating seal translatable in a fore-aft direction.

3. Pneumatic arc extinguish chamber according to claim 2, wherein said seal is in guiding engagement with the inner wall of the first part (13) and/or the partition plate (12).

4. The puffer arc extinguishing chamber according to claim 3, characterized in that the front side of the separation plate (12) is provided with guide posts (17), the seal and the separation plate (12) being in guiding engagement by means of the guide posts (17), the spacing and holding structure being constituted by the guide posts (17).

5. The puffer arc chamber according to claim 4, characterized in that the front end of the guide post (17) is provided with a stop for preventing the seal from coming off the separation plate (12).

6. The puffer arc-extinguishing chamber according to claim 5, wherein the guide post (17) comprises a threaded section at the rear end that is in threaded engagement with the separation plate (12), a guide section at the front end of the threaded section, and a stop section at the front end of the guide section that forms the stop, the diameter of the stop section being greater than the diameter of the guide section, the diameter of the guide section being greater than the diameter of the threaded section.

7. Pneumatic arc extinguish chamber according to any one of claims 1 to 6, wherein the elastic member is a supporting spring which is mounted between the partition plate (12) and the piston (7).

8. Pneumatic arc extinguish chamber according to claim 7, wherein said supporting spring is a coil spring (18), and said piston (7) is provided with a positioning slot for inserting the end of said coil spring (18).

9. The puffer arc-chute according to any of claims 1 to 6, characterized in that the gas flow channel is constituted by a set of holes provided in the separation plate (12).

10. A circuit breaker comprising an operating mechanism and an arc-extinguishing chamber in driving connection with the operating mechanism, wherein the arc-extinguishing chamber is a puffer arc-extinguishing chamber according to any one of claims 1 to 9.

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