An arc extinguishing chamber exhaust system and an exhaust method thereof, and an arc extinguishing chamber including the same

Abstract

The present invention belongs to the technical field of arc extinguishing chamber, and relates to an arc extinguishing chamber exhaust system, including a baffle, a shielding cover, a shielding cylinder, and a guide cylinder. Both ends of the guide cylinder are open structures, the shielding cylinder covers the outside of the guide cylinder, the baffle is fixed to the end of the shielding cylinder, and the shielding cover covers the outside of the shielding cylinder and the baffle; the shielding cylinder and the guide cylinder are fixed to the static side flange of the arc extinguishing chamber; one side of the fixed end of the shielding cylinder is prefabricated with a plurality of through holes; the end of the shielding cylinder is prefabricated with a plurality of vents; the shielding cover is horn-shaped, and the end of the shielding cover is an open structure. The exhaust method thereof is also disclosed. Through the design of the guide cylinder, the shielding cylinder, the shielding cover and the baffle, the path of the airflow is gradually increased, the airflow velocity is reduced, and the damage to the shielding cover caused by the high airflow velocity is avoided. At the same time, due to the extension of the airflow path, the metal wear material has been attached to certain components during the outflow of the airflow, and will not flow out of the shielding cover with the airflow, thereby avoiding discharge to the shell and improving the insulation performance of the product.

Description

Technical Field

[0001] The present invention belongs to the technical field of arc extinguishing chambers, and in particular relates to an arc extinguishing chamber exhaust system and an exhaust method thereof, and an arc extinguishing chamber comprising the same. Background Art

[0002] With the development of social economy, the scale of power grid is constantly expanding. Many power grids have experienced the problem of short-circuit current exceeding the standard or about to exceed the standard, which has become the main contradiction restricting the development and safe operation of power grid. At present, the circuit breaker products with a rated short-circuit current of 63kA on the market will be difficult to meet the development needs of power grid, so circuit breaker products with a larger rated short-circuit current are needed. After the development in recent years, the double-action double-chamber arc extinguishing chamber structure can effectively solve the problem of insufficient small current breaking capacity of the self-energy arc extinguishing chamber.

[0003] Figure 1 It is a common double-action double-chamber arc extinguishing chamber structure. The baffle on the pull rod 1 separates the air chamber into two parts, namely the thermal expansion chamber 18 and the compressed air chamber 19. The dynamic side part drives the double-action structure 8 through the driving rod 7, which can make the static side part move; the static side end is equipped with a shield, which is mainly used to shield the internal electric field, and there is a small hole behind it for airflow. When the arc extinguishing chamber is opened, the dynamic side part moves downward with the pull rod 1, and the driving rod 7 drives the double-action structure 8 to make the static side part move upward. At this time, the hot air flow flows from the compressed air chamber 19 and the thermal expansion chamber 19 through the nozzle to the static side, and finally flows out from the small hole at the end of the static side shield.

[0004] When breaking a larger rated short-circuit current, the existing structure has the following main disadvantages:

[0005] 1. When breaking a large capacity current, the gas energy is relatively large. If it does not flow out in time through the small holes at the end of the shield, the internal gas pressure of the shield will increase, causing deformation or damage to the shield.

[0006] 2. Since the air flow channel of this structure is single and small, the gas cannot dissipate heat in time when breaking large-capacity current, which will cause the arc extinguishing chamber temperature to be high and affect the breaking performance of the product.

[0007] 3. The airflow flows directly from the small shielding hole on the static side to the external space, which will cause the gas flow rate here to be very high. And when metal wear materials are mixed into the gas, it may discharge to the shell from here, affecting the insulation performance of the product. Summary of the invention

[0008] The purpose of the present invention is to provide an arc extinguishing chamber exhaust system and an exhaust method thereof, and an arc extinguishing chamber containing the same, which solves the problems that the existing exhaust structure easily causes deformation of the shielding cover, the gas cannot dissipate heat in time to affect the breaking performance, and the gas may be mixed with metal wear products to affect the insulation performance.

[0009] The present invention is achieved through the following technical solutions:

[0010] The invention discloses an arc extinguishing chamber exhaust system, comprising a baffle, a shielding cover, a shielding cylinder, and a guide cylinder, both ends of the guide cylinder are open structures, the shielding cylinder is covered on the outside of the guide cylinder, the baffle is fixed to the end of the shielding cylinder, and the shielding cover is covered on the outside of the shielding cylinder and the baffle;

[0011] A static side flange is provided on the static side of the arc extinguishing chamber, and the shielding tube and the guide tube are fixed on the static side flange;

[0012] A plurality of through holes are prefabricated on one side of the fixed end of the shielding tube; a plurality of vent holes are prefabricated on the end of the shielding tube;

[0013] The shielding cover is in a trumpet shape, and the end of the shielding cover is an open structure.

[0014] Furthermore, the arc extinguishing chamber exhaust system also includes a guide plate, which is arranged on the gas outlet side of the shielding cover and the baffle.

[0015] Further, the baffle is provided with a plurality of air outlet holes;

[0016] The middle part of the guide plate is thinner, the edge part is thicker, and there is an arc transition from thick to thin.

[0017] Furthermore, the height of the guide tube is 40% to 70% of the height of the shielding tube.

[0018] Furthermore, the bottom of the guide tube is provided with a flange, and a mounting hole a is provided on the flange.

[0019] Furthermore, the shielding tube is a double-layer structure, including an inner tube and an outer tube, the fixed end of the inner tube is folded outward, and the outer tube is integrally connected to the inner tube through the folded portion;

[0020] The inner tube is higher than the outer tube, the inner tube is closed at one end, and the outer tube is open at the other end, and the air flows out from the open end;

[0021] The through hole is arranged on the circumference of the inner cylinder close to the static side flange, and the vent hole is arranged on the end surface of the inner cylinder.

[0022] Furthermore, the center position of the through hole is within 1 / 4 of the length of the inner tube; the total cross-sectional area of ​​the through hole is 70% to 90% of the cross-sectional area of ​​the inner tube;

[0023] The total cross-sectional area of ​​the vent holes is 10% to 30% of the cross-sectional area of ​​the inner tube;

[0024] The height of the outer cylinder is more than 1 / 4 of the height of the inner cylinder, and a mounting hole b is opened on the surface of the outer cylinder for mounting the shielding cover.

[0025] Furthermore, the shielding cover comprises a first straight tube section, a horn section and a second straight tube section connected in sequence, the first straight tube section is arranged close to the side of the static side flange; the horn section is horn-shaped, and the diameter of the connection end with the first straight tube section is smaller than the connection end with the second straight tube section;

[0026] At the end of the second straight tube section, there is an arc surface that bends inwards;

[0027] A mounting hole d is provided on the first straight tube section for fixed connection with the shielding tube or with the static side flange.

[0028] The present invention also discloses an exhaust method of the arc extinguishing chamber exhaust system, comprising the following process:

[0029] When the arc extinguishing chamber is opened, the interrupted airflow flows into the static side; the airflow first passes through the guide tube and is directed upward, and the airflow increases the airflow path in the guide tube and reduces the airflow speed;

[0030] When the airflow flows upward through the guide tube to the end of the shielding tube, part of the airflow flows to the outside through the vent hole at the end of the shielding tube, reducing the internal gas pressure and preventing the parts from being deformed due to excessive internal gas pressure; the remaining majority of the airflow will flow back in the opposite direction, flowing through the space between the shielding tube and the guide tube, and flowing out from the through hole below the shielding tube. At this time, the airflow further increases the airflow path in the shielding tube, reducing the airflow speed;

[0031] The airflow out of the through hole at the bottom of the shield tube will flow back upward along the shield cover. At this time, the airflow path is further increased and the gas flow rate is further reduced.

[0032] When the airflow flows in the shielding cover, the cross-sectional area of ​​the shielding cover increases toward the end, the gas pressure decreases, and the gas flow rate decreases again.

[0033] When the airflow flows to the end of the shielding cover, the baffle installed behind the shielding tube will block the airflow once, further reducing the gas flow rate.

[0034] The invention also discloses an arc extinguishing chamber comprising the arc extinguishing chamber exhaust system.

[0035] Compared with the prior art, the present invention has the following beneficial technical effects:

[0036] The invention discloses an arc extinguishing chamber exhaust system, wherein a guide tube, a shielding tube, a shielding cover and a baffle are designed on the static side flange to form a reciprocating airflow channel, so that the airflow path is increased and the pressure is reduced. The shielding tube is covered on the outside of the guide tube, the baffle is fixed on the end of the shielding tube, and the shielding cover is covered on the outside of the shielding tube and the baffle; the guide tube and the shielding tube can increase the airflow path, increase the friction between the airflows in large-capacity breaking, and accelerate the energy loss; the shielding cover is trumpet-shaped, which can increase the airflow passing cross-section, reduce the airflow velocity in large-capacity breaking, and reduce the airflow energy; the baffle can increase the blocking of the gas, reduce the gas flow velocity in large-capacity breaking, and prevent the high-temperature gas from directly discharging to the shell. Through the design of the guide tube, the shielding tube, the shielding cover and the baffle, the airflow path is gradually increased, the airflow velocity is reduced, and the damage to the shielding cover caused by the high airflow velocity is avoided. At the same time, due to the extension of the airflow path, the metal wear material has been attached to certain components during the outflow of the airflow, and will not flow out of the shielding cover with the airflow, thereby avoiding discharge to the shell and improving the insulation performance of the product.

[0037] Furthermore, a guide plate is designed. When the airflow flows out of the shielding cover, it will flow directly to the guide plate, and the airflow will be guided to other places of the arc extinguishing chamber tank through the rebound of the guide plate. In this process, the flow rate of the airflow will be further reduced.

[0038] Furthermore, through research and design, it was found that when the height of the guide tube is 40% to 70% of the height of the shielding tube, the guide effect of the guide tube is optimal.

[0039] Furthermore, the shielding tube has a double-layer structure, the inner tube is longer and closed at the end; the outer tube is shorter and not closed at the end, and the cross-sections of the inner and outer tubes remain unchanged.

[0040] Furthermore, the inner layer of the shielding tube is provided with a plurality of relatively large circular holes along the circumferential direction near the flange end, and the center position of the large circular holes is approximately within 1 / 4 of the length of the inner layer; the total cross-sectional area of ​​the large circular holes should be 70% to 90% of the cross-sectional area of ​​the inner layer of the shielding tube, which can ensure that most of the gas flows out from this channel;

[0041] There are several small holes on the end surface of the inner layer of the shielding tube. The total cross-sectional area of ​​the small holes should be 10% to 30% of the cross-sectional area of ​​the inner layer of the shielding tube, so that a small part of the gas can flow out from there.

[0042] The shielding tube has two air flow channels, which can allow most of the gas to enter the longer channel to further reduce the gas energy; a small part of the gas is directly discharged to the end of the large tank to avoid the pressure increase caused by the untimely discharge of the gas in the shielding tube and the deformation of parts;

[0043] The height of the outer layer of the shielding tube is about 1 / 4 of the height of the inner layer of the shielding tube, which can block the larger through holes in the inner layer and change the direction of airflow;

[0044] A baffle is installed at the end of the inner layer of the shielding tube, and a vent hole is opened on it, which can block the airflow to a certain extent and reduce its flow rate.

[0045] Furthermore, the shielding cover is designed in three sections, with a smaller opening on the side close to the static side flange and a larger opening on the side away from the static side flange, so that the cross-sectional area of ​​the shielding cover increases toward the end, so the gas pressure decreases when the air flows out, and the gas flow rate decreases again;

[0046] At the end of the second straight tube section, there is an inward curved arc surface, which will block and converge the airflow again to prevent the airflow from blowing directly around the large tank.

[0047] The present invention also discloses an exhaust method of the exhaust system, wherein the airflow is all directed upward through the guide tube, and the airflow increases the airflow path in the guide tube, thereby reducing the airflow speed; when the airflow flows upward through the guide tube to the end of the shielding tube, a small part of the airflow flows to the outside through the hole at the end of the shielding tube, thereby reducing the internal gas pressure and preventing the parts from being deformed due to excessive internal gas pressure; the remaining majority of the airflow will flow back in the opposite direction, flow through the space between the shielding tube and the guide tube, and flow out from the hole below the shielding tube, at which point the airflow further increases the airflow path in the shielding tube, thereby reducing the airflow speed; the airflow flowing out from the large hole below the shielding tube will flow back upward along the shielding cover, at which point the airflow path is further increased, and the gas flow rate is further reduced; at the same time, since the cross-sectional area of ​​the shielding cover increases toward the end, the gas pressure will decrease, and the gas flow rate will decrease again; when the airflow flows to the end of the shielding cover, the baffle installed behind the shielding tube will block the airflow once, thereby further reducing the gas flow rate. Gradually reduce the air flow velocity and extend the air flow path to avoid damage to the shielding cover caused by high air flow velocity. At the same time, due to the extension of the air flow path, metal wear products have been attached to certain components during the outflow of airflow and will not flow out of the shielding cover with the airflow, thereby avoiding discharge to the outer shell and improving the insulation performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a common double-action double-chamber arc-extinguishing chamber structure;

[0049] Figure 2 An example structure of applying the exhaust system of the present invention to an arc extinguishing chamber structure;

[0050] Figure 3 It is a schematic diagram of the exhaust system structure of an arc extinguishing chamber of the present invention;

[0051] Figure 4 It is a structural schematic diagram of the guide tube;

[0052] Figure 5a It is a schematic diagram of the three-dimensional structure of the shielding tube;

[0053] Figure 5b for Figure 5a A cross-sectional schematic diagram of

[0054] Figure 6a is a schematic diagram of the three-dimensional structure of the shielding cover;

[0055] Figure 6b for Figure 6a A cross-sectional schematic diagram of

[0056] Figure 7 is a schematic diagram of the baffle structure;

[0057] Figure 8 It is a schematic diagram of the guide plate structure; Figure a is a top view of the guide plate, and Figure b is a front view of the guide plate.

[0058] Among them, 1. pull rod; 2. cylinder; 3. moving main contact; 4. moving arc contact; 5. small nozzle; 6. large nozzle; 7. driving rod; 8. double-acting structure; 9. baffle; 10. guide plate; 11. shielding cover; 12. shielding cylinder; 13. guide cylinder; 14. static side flange; 15. static main contact; 16. static arc contact; 17. tank; 18. thermal expansion chamber; 19. compressed air chamber;

[0059] 131, flange; 132, mounting hole a;

[0060] 121, inner tube; 122, outer tube; 123, through hole; 124, mounting hole b; 125, vent hole; 126, mounting hole c;

[0061] 111, first straight tube section; 112, horn section; 113, second straight tube section; 114, arc surface; 115, mounting hole d;

[0062] 91, mounting hole e; 92, small air outlet; 93, medium air outlet; 94, large air outlet;

[0063] 101. Mounting hole f. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is further described in detail 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 and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, not all embodiments.

[0065] The components described and shown in the drawings and embodiments of the present invention may be arranged and designed in various configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0066] It should be noted that the terms "comprises", "includes" or any other variations are intended to cover non-exclusive inclusion, so that a process, element, method, article or equipment that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to the process, element, method, article or equipment.

[0067] like Figure 3 As shown, the present invention discloses an arc extinguishing chamber exhaust system, including a baffle 9, a shielding cover 11, a shielding tube 12, and a guide tube 13. The shielding tube 12 and the guide tube 13 are fixed on the static side flange 14 of the arc extinguishing chamber, and both ends of the guide tube 13 are open structures. The shielding tube 12 covers the outside of the guide tube 13, the baffle 9 is fixed to the end of the shielding tube 12, and the shielding cover 11 covers the outside of the shielding tube 12 and the baffle 9.

[0068] Preferably, Figure 2 As shown, the arc extinguishing chamber exhaust system is further designed with a guide plate 10, and the guide plate 10 is fixed on the inner wall of the tank body 17 of the arc extinguishing chamber.

[0069] like Figure 4 As shown, the guide tube 13 is an open structure with a constant cross-sectional area and an inner diameter not less than the inner diameter of the static main contact 15, and is installed on the static side flange 14. There are no openings or grooves on the tube surface, which are used to guide the interrupted airflow to its end. In order to enhance the guiding effect of the guide tube 13, it is designed that the height of the guide tube 13 should be 40% to 70% of the height of the shielding tube 12.

[0070] The inner diameter of the guide tube 13 is designed to be not less than the inner diameter of the static main contact 15, so as to facilitate the smooth passage of airflow at the nozzle without obstruction.

[0071] The bottom of the guide tube 13 is provided with a flange 131 , and a mounting hole a132 is formed on the flange 131 .

[0072] like Figure 5a and Figure 5b As shown, the shielding cylinder 12 is a double-layer structure, including an inner cylinder 121 and an outer cylinder 122. The fixed end of the inner cylinder 121 is folded outward, and the outer cylinder 122 is integrally connected to the inner cylinder 121 at the folded portion.

[0073] The inner cylinder 121 is relatively long and closed at the end; the outer cylinder 122 is relatively short and open at the end, through which the air flows out; the inner and outer cylinders are concentrically arranged and installed on the static side flange 14. The installation center lines of the shield cylinder 12 and the guide cylinder 13 are the same axis.

[0074] The inner cylinder 121 is provided with a plurality of relatively large through holes 123 along the circumferential direction near the static side flange 14, and the center position of the through holes 123 is approximately within 1 / 4 of the length of the inner cylinder; the total cross-sectional area of ​​the through holes 123 should be 70% to 90% of the cross-sectional area of ​​the inner cylinder 121. The end surface of the inner cylinder 121 is provided with a plurality of relatively small vent holes 125, and the total cross-sectional area of ​​the vent holes 125 should be 10% to 30% of the cross-sectional area of ​​the inner cylinder 121.

[0075] The height of the outer cylinder 122 is approximately more than 1 / 4 of the height of the inner cylinder 121, and a mounting hole b124 is opened on the cylinder surface for installing the shielding cover 11; the end surface of the inner cylinder 121 is also opened with a mounting hole c126 for installing the baffle 9.

[0076] like Figure 6a and Figure 6b As shown, the shielding cover 11 includes a first straight tube section 111, a horn section 112, and a second straight tube section 113 connected in sequence. The first straight tube section 111 is close to the stationary side flange 14, and the first straight tube section 111 is connected to the outer tube 122 of the shielding tube 12; the horn section 112 is in a horn shape, with a smaller opening on the side close to the stationary side flange 14 and a larger opening on the side away from the stationary side flange 14. The first straight tube section 111 has a mounting hole d115 for mounting it on the shielding tube 12, and the end of the second straight tube section 113 has an inwardly curved arc surface 114.

[0077] like Figure 7 As shown, the baffle 9 is a circular thin plate, which is installed on the shielding tube 12. The circular diameter of the baffle 9 is smaller than the diameter of the large end of the shielding cover 11, and larger than the diameter of the small end of the shielding cover 11. The baffle 9 is provided with a plurality of air outlets of different sizes, namely a small air outlet 92, a medium air outlet 93, and a large air outlet 94, wherein the medium air outlet 93 and the large air outlet 94 are used to directly discharge the gas in the inner tube 121 of the shielding tube 12, and the total area should be about half of the area of ​​the baffle 9.

[0078] The baffle plate 9 is also provided with a mounting hole e 91 which is screwed to the mounting hole c126 for mounting it on the shielding tube 12 .

[0079] like Figure 8 and Figure 2 As shown, the guide plate 10 is made of insulating material and is installed on the cover plate of the tank body 17. Figure 8 As shown in Figures a and b, the guide plate 10 is a circular thin plate with different thicknesses, thinner in the middle and thicker at the edge, and a circular arc transition from thick to thin. The guide plate 10 is provided with a mounting hole f101.

[0080] exist Figure 3 In the embodiment, when the arc extinguishing chamber is opened, the interrupted airflow flows from the nozzle to the static side. First, the airflow is all directed upward through the guide tube 13, and the airflow increases the airflow path in the guide tube 13, reducing the airflow speed. Secondly, when the airflow flows upward through the guide tube 13 to the end of the shielding tube 12, a small part of the airflow flows to the outside through the small hole at the end of the shielding tube 12, which can reduce the internal gas pressure and prevent the parts from being deformed due to excessive internal gas pressure; the remaining majority of the airflow will flow back through the space between the shielding tube 12 and the guide tube 13, and flow out from the large hole below the shielding tube 12. At this time, the airflow further increases the airflow path in the shielding tube 12 and reduces the airflow speed. The airflow flowing out of the large hole below the shielding tube 12 will flow back upward along the shielding cover 11. At this time, the airflow path is further increased and the gas flow rate is further reduced. At the same time, since the cross-sectional area of ​​the shielding cover 11 increases toward the end, the gas pressure will decrease and the gas flow rate will decrease again. When the airflow flows to the end of the shielding cover 11, the baffle 9 installed behind the shielding tube 12 will block the airflow once, so that the gas flow rate is further reduced.

[0081] Preferably, when the airflow flows out of the shielding cover 11, it will flow directly to the guide plate 10 at the end of the tank body 17, and the airflow will be guided to other places of the tank body 17 through the rebound of the guide plate 10 and the arc of the edge. In this process, the flow rate of the airflow will be reduced to a minimum.

[0082] exist Figure 3 The exhaust system can retain the metal wear materials carried in the airflow, preventing the airflow from blowing the metal wear materials directly to the shell, causing discharge to the shell. The shielding cover 11 and the arc bend on it also play the role of shielding the static side electric field, which can improve the insulation performance of the product.

[0083] The features and performances of the present invention are further described in detail below in conjunction with application examples.

[0084] Will Figure 3 The exhaust system shown is used in Figure 1 In the arc extinguishing chamber structure, we can obtain Figure 2 The structure shown.

[0085] exist Figure 2 In the embodiment, the arc extinguishing chamber and its exhaust system are fixedly installed inside the tank 17. The pull rod 1, cylinder 2, moving main contact 3, moving arc contact 4, small nozzle 5, large nozzle 6, drive rod 7, double moving structure 8, static side flange 14, static main contact 15, static arc contact 16 are the main parts of the arc extinguishing chamber; the baffle 9, guide plate 10, shielding cover 11, shielding tube 12, guide tube 13 are the components of the exhaust system.

[0086] When the arc extinguishing chamber interrupts a large rated short-circuit current, a large amount of high-temperature and high-pressure gas will be generated inside the arc extinguishing chamber. The exhaust system is needed to discharge the high-energy gas from the arc extinguishing chamber in time to meet the normal breaking function of the product.

[0087] exist Figure 3 In the case of arc extinguishing chamber opening, the interrupted airflow flows from the nozzle to the static side. First, the airflow is all directed upward through the guide tube 13, and the airflow increases the airflow path in the guide tube 13, reducing the airflow speed. Secondly, when the airflow flows upward through the guide tube 13 to the end of the shielding tube 12, a small part of the airflow flows to the outside through the small hole at the end of the shielding tube 12, which can reduce the internal gas pressure and prevent the parts from being deformed due to excessive internal gas pressure; the remaining majority of the airflow will flow back through the space between the shielding tube 12 and the guide tube 13, and flow out from the large hole below the shielding tube 12. At this time, the airflow further increases the airflow path in the shielding tube and reduces the airflow speed. The airflow flowing out of the large hole below the shielding tube 12 will flow back upward along the shielding cover 11. At this time, the airflow path is further increased and the gas flow rate is further reduced. At the same time, since the cross-sectional area of ​​the shielding cover 11 increases toward the end, the gas pressure will decrease and the gas flow rate will decrease again. When the airflow reaches the end of the shielding cover 11, the baffle 9 installed behind the shielding tube 12 will block the airflow once, further reducing the gas flow rate. When the airflow flows out of the shielding cover 11, it will directly flow to the guide plate 10 at the end of the large tank, and the airflow will be guided to other places in the large tank through the rebound of the guide plate 10 and the arc of the edge. In this process, the flow rate of the airflow will be reduced to the minimum.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An arc extinguishing chamber exhaust system, characterized in that: It comprises a baffle (9), a shielding cover (11), a shielding cylinder (12), and a guide cylinder (13), wherein both ends of the guide cylinder (13) are open structures, the shielding cylinder (12) covers the outside of the guide cylinder (13), the baffle (9) is fixed to the end of the shielding cylinder (12), and the shielding cover (11) covers the outside of the shielding cylinder (12) and the baffle (9); A static side flange (14) is provided on the static side of the arc extinguishing chamber, and the shielding tube (12) and the guide tube (13) are fixed on the static side flange (14); A plurality of through holes (123) are prefabricated on one side of the fixed end of the shielding tube (12); a plurality of vent holes (125) are prefabricated on the end of the shielding tube (12); The shielding cover (11) is trumpet-shaped, and the end of the shielding cover (11) is an open structure; The arc extinguishing chamber exhaust system further comprises a guide plate (10), wherein the guide plate (10) is arranged on the gas outlet side of the shielding cover (11) and the baffle plate (9); The shielding cylinder (12) is a double-layer structure, comprising an inner cylinder (121) and an outer cylinder (122); the fixed end of the inner cylinder (121) is folded outward, and the outer cylinder (122) is integrally connected to the inner cylinder (121) at the folded portion; The inner cylinder (121) is higher than the outer cylinder (122), the end of the inner cylinder (121) is closed, and the end of the outer cylinder (122) is open, and air flows out from the open end; The through hole (123) is formed on the circumference of the inner cylinder (121) close to the static side flange (14), and the vent hole (125) is formed on the end surface of the inner cylinder (121); The baffle plate (9) is provided with a plurality of air outlet holes, namely a small air outlet hole (92), a medium air outlet hole (93), and a large air outlet hole (94). The medium air outlet hole (93) and the large air outlet hole (94) are used to discharge the gas in the inner cylinder (121) of the shield cylinder (12). The guide plate (10) is thinner in the middle part and thicker in the edge part, and there is an arc transition from thick to thin.

2. An arc extinguishing chamber exhaust system according to claim 1, characterized in that: The height of the guide tube (13) is 40%-70% of the height of the shielding tube (12).

3. The arc extinguishing chamber exhaust system according to claim 1, characterized in that: The bottom of the guide tube (13) is provided with a flange (131), and a mounting hole a (132) is formed on the flange (131).

4. The arc extinguishing chamber exhaust system according to claim 1, characterized in that: The center position of the through hole (123) is within 1 / 4 of the length of the inner cylinder (121); the total cross-sectional area of ​​the through hole (123) is 70%-90% of the cross-sectional area of ​​the inner cylinder (121); The total cross-sectional area of ​​the vent holes (125) is 10% to 30% of the cross-sectional area of ​​the inner cylinder (121); The height of the outer cylinder (122) is more than 1 / 4 of the height of the inner cylinder (121), and a mounting hole b (124) is provided on the surface of the outer cylinder (122) for mounting the shielding cover (11).

5. The arc extinguishing chamber exhaust system according to claim 1, characterized in that: The shielding cover (11) comprises a first straight tube section (111), a horn section (112), and a second straight tube section (113) which are connected in sequence; the first straight tube section (111) is arranged close to a side of the stationary side flange (14); the horn section (112) is horn-shaped, and the diameter of the end connected to the first straight tube section (111) is smaller than the diameter of the end connected to the second straight tube section (113); An inwardly curved arc surface (114) is provided at the end of the second straight tube section (113); A mounting hole d (115) is provided on the first straight tube section (111) for fixedly connecting with the shielding tube (12) or with the static side flange (14).

6. The exhaust method of the arc extinguishing chamber exhaust system according to any one of claims 1 to 5, characterized in that: The process includes: When the arc extinguishing chamber is opened, the interrupted airflow flows into the static side; the airflow first passes through the guide tube (13) and is all directed upwards, and the airflow increases the airflow path in the guide tube (13), thereby reducing the airflow speed; When the airflow flows upward through the guide tube (13) to the end of the shielding tube (12), a portion of the airflow flows to the outside through the vent hole (125) at the end of the shielding tube (12), thereby reducing the internal gas pressure and preventing deformation of parts due to excessive internal gas pressure; the remaining airflow will flow back through the space between the shielding tube (12) and the guide tube (13), and flow out from the through hole (123) below the shielding tube (12), at which point the airflow further increases the airflow path in the shielding tube (12), thereby reducing the airflow speed; The airflow flowing out from the through hole (123) below the shielding tube (12) will flow back upward along the shielding cover (11), at which point the airflow path will be further increased and the gas flow rate will be further reduced; When the airflow flows in the shielding cover (11), the cross-sectional area of ​​the shielding cover (11) increases toward the end, the gas pressure decreases, and the gas flow rate decreases again; When the airflow reaches the end of the shielding cover (11), the baffle (9) installed behind the shielding cylinder (12) blocks the airflow once, thereby further reducing the gas flow rate.

7. An arc extinguishing chamber comprising the arc extinguishing chamber exhaust system according to any one of claims 1 to 5.

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