A shielding cover structure of arc extinguishing chamber of circuit breaker with easy heat dissipation

Abstract

The present invention discloses a shielding cover structure of an arc extinguishing chamber of a circuit breaker that is easy to dissipate heat, which belongs to the technical field of high-voltage switchgear and comprises a static contact end and a shielding cover structure. The shielding cover structure comprises a connecting end, a shielding cover and a heat exchange and cooling structure. The connecting end is assembled at the rear end of the static contact end, the shielding cover is assembled in the connecting end, and the heat exchange and cooling structure is assembled between the connecting end and the shielding cover. The present invention designs the shielding cover structure of the arc extinguishing chamber of the circuit breaker, diverts the high-temperature airflow through a conical protrusion, and then makes the high-temperature airflow flow in a spiral shape between the guide tube and the shielding cover under the action of the heat exchange and cooling structure, lengthens the distance that the high-temperature airflow flows in the shielding cover, and fully exchanges heat with the medium in the heat exchange and cooling structure to perform efficient cooling, so that the temperature of the airflow finally flowing out of the shielding cover structure is greatly reduced, thereby avoiding damage to the pipe wall of the circuit breaker.

Description

Technical Field

[0001] The invention belongs to the technical field of high-voltage switchgear, and in particular provides a shielding cover structure of an arc extinguishing chamber of a circuit breaker which is easy to dissipate heat. Background Art

[0002] In a circuit breaker, the process of contact connection and disconnection of current is often accompanied by the generation and extinction of an arc. The arc surface temperature can reach over 3000-4000℃, and the arc core temperature can reach over 10000℃. The medium molecules and atoms at high temperature produce strong thermal motion, which in turn generates high-temperature airflow. At present, the shielding cover of the circuit breaker arc extinguishing chamber generally adopts a flat-plate design, with vents at the bottom. The high-temperature airflow will pass through the vents and blow directly to the wall of the circuit breaker. Since the high-temperature airflow stays inside the shielding cover for a short time and cannot be fully cooled, the high-temperature airflow may damage the tank of the circuit breaker, thereby shortening the service life of the circuit breaker, and in severe cases, it may also affect the normal operation of the circuit breaker. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a circuit breaker arc extinguishing chamber shielding cover structure which is easy to dissipate heat.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a shield cover structure of an arc extinguishing chamber of a circuit breaker that is easy to dissipate heat, comprising a static contact end and a shield cover structure, wherein the shield cover structure comprises a connecting end, a shield cover and a heat exchange and cooling structure, wherein the connecting end is assembled at the rear end of the static contact end, the shield cover is assembled in the connecting end, and the heat exchange and cooling structure is assembled between the connecting end and the shield cover;

[0005] The connecting end includes a guide tube and an outer guide cover, and the outer guide cover is fixedly mounted on the outer surface of the guide tube, a conical protrusion is arranged at the bottom of the inner cavity of the shielding cover, and air guide ports are evenly arranged at the open end of the shielding cover;

[0006] The heat exchange and cooling structure includes an annular tube and a spiral tube. There are two spiral tubes in total. The rotation direction and spacing of the two spiral tubes are the same. The axes of the rear end ports of the two spiral tubes are 180°. One end of the two spiral tubes is connected to the annular tube, and the other ends of the two spiral tubes are fixedly installed with connecting tubes. The annular tube and the spiral tube are located between the guide tube and the shielding cover, and the connecting tube passes through the shielding cover toward the outside. The spiral tube divides the space between the guide tube and the shielding cover into a spiral channel.

[0007] Furthermore, the static contact end includes a static contact seat, a static arc contact and a contact finger, and the front end of the guide tube is inserted into the rear end of the static contact seat, a static main contact seat is fixedly installed on the front side of the inner surface of the static contact seat, a support plate is fixedly installed on the rear side of the inner surface of the static contact seat, and the static arc contact is installed on the support plate, a contact finger frame is installed at the front end of the static main contact seat, and the contact finger is installed on the contact finger frame, and a guide cover is installed on the inner side of the static main contact seat.

[0008] Furthermore, a thread is provided at the rear end of the inner surface of the static contact seat, and an auxiliary air guide cover is screwed to the rear side of the inner surface of the static contact seat, and a fixing column is fixedly installed on the rear end surface of the auxiliary air guide cover.

[0009] Furthermore, the diameter of the guide tube is larger than the diameters of the guide cover and the auxiliary guide cover.

[0010] Furthermore, a shielding cover mounting block is fixedly mounted on the inner surface of the outer guide cover, the inner surface of the shielding cover mounting block and the outer surface of the open end of the shielding cover are provided with matching threads, and the shielding cover is screwed into the shielding cover mounting block.

[0011] Furthermore, the outer surface of the shielding cover is provided with small holes in a spiral shape, and the small holes are connected to the spiral channel.

[0012] Furthermore, an air outlet corresponding to the air guide port is provided on the outer surface of the annular tube, and a guide hole is provided on the outer surface of the spiral tube. The guide hole is inclined relative to the spiral tube, and the angle between the axis of the guide hole and the center line of the spiral tube is an acute angle.

[0013] Furthermore, a heat-conducting structure is installed at the rear end of the shielding cover, a heat dissipation structure is installed at the rear end of the heat-conducting structure, a threaded groove is provided on the rear end surface of the shielding cover, a conical groove corresponding to the conical protrusion is provided in the threaded groove, and the heat-conducting structure is installed in the conical groove.

[0014] Furthermore, the heat-conducting structure includes a threaded block, a bracket plate, a heat-conducting rod and a positioning block, the threaded block is screwed into the threaded groove, a circular hole is provided on the front surface of the threaded block, and the bracket plate is inserted into the circular hole, a heat-conducting rod is evenly fixedly installed on the front surface of the bracket plate, a heat-conducting slot corresponding to the heat-conducting rod is evenly provided on the outer surface of the conical protrusion, the positioning block is rotatably assembled on the rear end of the threaded block, and the front end of the positioning block is fixedly connected to the rear end of the bracket plate, and an insert block is evenly fixedly installed on the rear surface of the threaded block.

[0015] Furthermore, the heat dissipation structure includes a mounting block, a heat conductive block and a heat dissipation rod, the front surface of the mounting block is provided with a slot matching the plug-in block, a through hole is provided in the middle of the front surface of the mounting block, and the heat conductive block is fixedly installed in the through hole, and the heat dissipation rod is evenly and fixedly installed on the rear surface of the heat conductive block.

[0016] The beneficial effects of using the present invention are:

[0017] The present invention designs a shielding cover structure of the arc extinguishing chamber of the circuit breaker, diverts the high-temperature airflow through a conical protrusion, and then makes the high-temperature airflow flow in a spiral shape between the guide tube and the shielding cover under the action of the heat exchange and cooling structure, thereby lengthening the flow distance of the high-temperature airflow in the shielding cover, and fully exchanging heat with the medium in the heat exchange and cooling structure to perform efficient cooling, so that the temperature of the airflow finally flowing out of the shielding cover structure is greatly reduced, thereby avoiding damage to the pipe wall of the circuit breaker.

[0018] The present invention designs a heat exchange and cooling structure, and opens an air outlet on its surface, so that the heat exchange gas eventually flows to the outer guide cover and flows out. Driven by this part of the airflow, it will drive the gas flow in the static contact end and the shielding cover structure to improve the heat dissipation efficiency. At the same time, the wind force generated will also blow the arc, which is beneficial to accelerate the extinction of the arc, can take away the heat generated by the arc, reduce the arc temperature, and blow away the charged particles in the arc, thereby weakening the conductivity of the arc.

[0019] The present invention designs a guide hole on the heat exchange and cooling structure, so that part of the low-temperature gas in the spiral tube can flow out and mix with the high-temperature airflow, thereby promoting the cooling of the high-temperature airflow. At the same time, the angle design of the guide hole enables this part of the low-temperature gas to assist in driving the flow of the high-temperature airflow, thereby further improving the cooling efficiency.

[0020] The present invention can also provide a heat conduction structure and a heat dissipation structure at the rear end of the shielding cover, so that solid heat conduction can be performed while gas heat exchange is performed on the high-temperature airflow, thereby further improving the efficiency of heat exchange and cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is one of the three-dimensional schematic diagrams of the first embodiment of the present invention.

[0022] Figure 2 This is the second stereoscopic schematic diagram of the first embodiment of the present invention.

[0023] Figure 3 This is a front cross-sectional view of the first embodiment of the present invention.

[0024] Figure 4 It is a top cross-sectional view of the first embodiment of the present invention.

[0025] Figure 5 It is a three-dimensional schematic diagram of the connection end of the first embodiment of the present invention.

[0026] Figure 6 It is a three-dimensional schematic diagram of the shielding cover according to the first embodiment of the present invention.

[0027] Figure 7This is one of the three-dimensional schematic diagrams of the heat exchange and cooling structure of the first embodiment of the present invention.

[0028] Figure 8 This is the second three-dimensional schematic diagram of the heat exchange and cooling structure of the first embodiment of the present invention.

[0029] Fig. 9 It is a three-dimensional schematic diagram of the second embodiment of the present invention.

[0030] Fig.10 This is an exploded view of the second embodiment of the present invention.

[0031] Fig.11 It is a front cross-sectional view of the second embodiment of the present invention.

[0032] Fig.12 This is one of the three-dimensional schematic diagrams of the shielding cover according to the second embodiment of the present invention.

[0033] Fig.13 This is a second three-dimensional schematic diagram of the shielding cover according to the second embodiment of the present invention.

[0034] Fig.14 It is a three-dimensional schematic diagram of the heat conduction structure of the second embodiment of the present invention.

[0035] Fig.15 It is a three-dimensional schematic diagram of the heat dissipation structure of the second embodiment of the present invention.

[0036] Fig.16 It is a three-dimensional schematic diagram of the heat exchange and cooling structure of the third embodiment of the present invention.

[0037] The reference numerals include: 1, static contact end, 11, static contact seat, 12, static arc contact, 13, contact finger, 14, static main contact seat, 15, support plate, 16, contact finger frame, 17, guide cover, 18, auxiliary guide cover, 181, fixing column, 2, shielding cover structure, 21, connecting end, 211, guide tube, 212, outer guide cover, 213, shielding cover mounting block, 22, shielding cover, 221, conical protrusion, 2211, thermal conductive slot, 2 22. small hole, 223. air guide port, 23. heat exchange and cooling structure, 231. annular tube, 2311. air outlet, 232. spiral tube, 2321. guide hole, 233. connecting tube, 24. heat conduction structure, 241. threaded block, 242. bracket plate, 243. heat conduction rod, 244. positioning block, 245. plug-in block, 25. heat dissipation structure, 251. mounting block, 252. heat conduction block, 253. heat dissipation rod, 254. slot. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1

[0040] Reference Figures 1 to 8 A shielding cover structure of an arc extinguishing chamber of a circuit breaker that is easy to dissipate heat includes a static contact end 1 and a shielding cover structure 2. The shielding cover structure 2 includes a connecting end 21, a shielding cover 22 and a heat exchange and cooling structure 23. The connecting end is assembled at the rear end of the static contact end 1, the shielding cover 22 is assembled in the connecting end 21, and the heat exchange and cooling structure 23 is assembled between the connecting end 21 and the shielding cover 22.

[0041] The static contact end 1 is a structure at one end of a static contact in a circuit breaker, and a shielding cover structure 2 is arranged at the rear end thereof for guiding and dissipating high-temperature airflow.

[0042] The shielding cover structure 2 is connected to the static contact end 1 through the connecting end 21, the heat exchange and cooling structure 23 is installed in the shielding cover 22, and the shielding cover 22 is installed in the connecting end 21 for guiding the high-temperature airflow and heat dissipation.

[0043] The connecting end 21 includes a guide tube 211 and an outer guide cover 212 , and the outer guide cover 212 is fixedly mounted on the outer surface of the guide tube 211 . A conical protrusion 221 is provided at the bottom of the inner cavity of the shielding cover 22 , and air guide ports 223 are evenly provided at the open end of the shielding cover 22 .

[0044] The conical protrusion 221 plays a role in diverting and guiding the high-temperature airflow, so that the high-temperature airflow flows more smoothly between the guide tube 211 and the shielding cover 22 .

[0045] The air guide port 223 can guide the airflow between the guide tube 211 and the shielding cover 22 into the outer guide cover 212, and then the airflow flows into the surrounding gas environment.

[0046] like Figure 7 and Figure 8As shown, the heat exchange and cooling structure 23 includes an annular tube 231 and a spiral tube 232. There are two spiral tubes 232. The rotation direction and spacing of the two spiral tubes 232 are the same. The axes of the rear end ports of the two spiral tubes 232 are 180°. One end of the two spiral tubes 232 is connected to the annular tube 231, and the other ends of the two spiral tubes 232 are fixedly installed with a connecting tube 233. The annular tube 231 and the spiral tube 232 are located between the guide tube 211 and the shielding cover 22, and the connecting tube 233 passes through the shielding cover 22 toward the outside. The spiral tube 232 divides the space between the guide tube 211 and the shielding cover 22 into a spiral channel.

[0047] Gas circulates in the heat exchange and cooling structure 23, and can exchange heat with the high-temperature airflow through the tube wall of the annular tube 231 and the tube wall of the spiral tube 232 to cool the high-temperature airflow. The two connecting tubes 233 are both connected to the air inlet pipe. The air inlet end of the air inlet pipe can be set at a position inside the circuit breaker opposite to the position of the shielding cover structure 2. When the current is connected and disconnected, the air pump at the air inlet end of the air inlet pipe runs to form a circulating airflow in the circuit breaker. On the one hand, it can promote the high-temperature airflow to flow to the shielding cover structure 2 for cooling, and the cooled airflow will not flow directly to the tube wall of the circuit breaker. On the other hand, it can blow the arc, which is beneficial to accelerate the extinction of the arc, take away the heat generated by the arc, reduce the arc temperature, and blow away the charged particles in the arc, weaken the conductivity of the arc, and avoid the damage of the arc to the circuit breaker. In addition, the air inlet end of the air inlet pipe is set inside the circuit breaker, and no external gas is introduced, which can effectively avoid corrosion or pollution of the equipment by external gas.

[0048] Half of the difference in diameter between the guide tube 211 and the shielding cover 22 is the same as the diameter of the spiral tube 232 , and the positions of the two spiral tubes 232 are arranged so that the volumes of the two sets of spiral channels are the same, which can evenly and effectively guide the high-temperature airflow.

[0049] Specifically, if Figures 1 to 4 As shown, the static contact end 1 includes a static contact seat 11, a static arc contact 12 and a contact finger 13, and the front end of the guide tube 211 is inserted into the rear end of the static contact seat 11, a static main contact seat 14 is fixedly installed on the front side of the inner surface of the static contact seat 11, a support plate 15 is fixedly installed on the rear side of the inner surface of the static contact seat 11, and the static arc contact 12 is installed on the support plate 15, a contact finger frame 16 is installed at the front end of the static main contact seat 14, and the contact finger 13 is installed on the contact finger frame 16, and a guide cover 17 is installed on the inner side of the static main contact seat 14.

[0050] Specifically, if Figure 3 and Figure 4 As shown, the rear end of the inner surface of the static contact seat 11 is provided with a thread, and the rear side of the inner surface of the static contact seat 11 is screwed with an auxiliary air guide cover 18, and the rear end surface of the auxiliary air guide cover 18 is fixedly installed with a fixing column 181.

[0051] The auxiliary air deflector 18 can be rotatably installed and removed via the fixing column 181 .

[0052] Specifically, if Figure 3 and Figure 4 As shown, the diameter of the guide tube 211 is greater than the diameters of the guide cover 17 and the auxiliary guide cover 18 .

[0053] When the high-temperature airflow flows from the static contact end 1 to the shielding cover structure 2, it will flow from the small-volume air guide cover 17 and the auxiliary air guide cover 18 to the large-volume air guide tube 211, which helps to promote the heat dissipation of the high-temperature airflow.

[0054] Specifically, if Figure 3 and Figure 4 As shown, a shielding cover mounting block 213 is fixedly mounted on the inner surface of the outer guide cover 212 , the inner surface of the shielding cover mounting block 213 and the outer surface of the open end of the shielding cover 22 are provided with matching threads, and the shielding cover 22 is screwed into the shielding cover mounting block 213 .

[0055] A total of four shielding cover mounting blocks 213 are arranged in the outer guide cover 212 , so as to realize a firm mounting of the shielding cover 22 .

[0056] Specifically, if Figure 6 As shown, a small hole 222 is formed on the outer surface of the shielding cover 22 in a spiral shape, and the small hole 222 is connected to the spiral channel.

[0057] The small holes 222 are designed to allow part of the high-temperature airflow to flow out when it flows in the spiral channel. On the one hand, this part of the gas can exchange heat with the external gas to achieve cooling. On the other hand, it can reduce the pressure in the spiral channel and ensure that the high-temperature airflow flows smoothly in the spiral channel.

[0058] Specifically, if Figure 7 and Figure 8 As shown, the outer surface of the annular tube 231 is provided with an air outlet 2311 corresponding to the air guide port 223, and the outer surface of the spiral tube 232 is provided with a guide hole 2321, which is inclined relative to the spiral tube 232, and the angle between the axis of the guide hole 2321 and the center line of the spiral tube 232 is an acute angle.

[0059] Connecting pipe mounting holes are symmetrically arranged on the shielding cover 22, and the connecting pipe 233 is installed through the connecting pipe mounting holes to complete the installation of the heat exchange and cooling structure 23 in the shielding cover 22. This can ensure that the air outlet 2311 on the annular tube 231 corresponds to the air guide port 223, thereby ensuring that the gas in the heat exchange and cooling structure 23 can flow out smoothly along the air guide port 223.

[0060] A guide hole 2321 is provided on the spiral tube 232, so that part of the gas in the spiral tube 232 can flow out and contact with the high-temperature airflow for heat exchange, so that the spiral tube 232 can exchange heat through the tube wall, and can also use this part of the gas to exchange heat and cool the high-temperature airflow, thereby improving the efficiency of heat exchange and cooling; at the same time, the direction of the guide hole 2321 is set, so that this part of the gas can assist in driving the high-temperature airflow to flow along the spiral channel. In addition, since this part of the gas flows into the spiral channel, the small hole 222 is provided on the shielding cover 22 to ensure that the pressure in the spiral channel remains unchanged, thereby ensuring the smooth circulation and cooling of the high-temperature airflow.

[0061] Embodiment 2

[0062] Specifically, if Figures 9 to 15 As shown, on the basis of the first embodiment, a heat-conducting structure 24 is installed at the rear end of the shielding cover 22, a heat-dissipating structure 25 is installed at the rear end of the heat-conducting structure 24, a threaded groove is provided on the rear end surface of the shielding cover 22, and a conical groove corresponding to the conical protrusion 221 is provided in the threaded groove, and the heat-conducting structure 24 is installed in the conical groove.

[0063] Specifically, if Fig.14 As shown, the heat-conducting structure 24 includes a threaded block 241, a bracket plate 242, a heat-conducting rod 243 and a positioning block 244. The threaded block 241 is screwed into the thread groove. A circular hole is provided on the front surface of the threaded block 241, and the bracket plate 242 is inserted into the circular hole. The heat-conducting rod 243 is evenly fixedly installed on the front surface of the bracket plate 242. The outer surface of the conical protrusion 221 is evenly provided with heat-conducting slots 2211 corresponding to the heat-conducting rod 243. The positioning block 244 is rotatably assembled on the rear end of the threaded block 241, and the front end of the positioning block 244 is fixedly connected to the rear end of the bracket plate 242. The rear surface of the threaded block 241 is evenly fixedly installed with an insert block 245.

[0064] The heat conducting rod 243 is inserted into the heat conducting slot 2211. When the high temperature airflow is diverted by the conical protrusion 221, part of the heat will be transferred to the heat conducting rod 243, and then the heat will be dissipated through the bracket plate 242, the positioning block 244 and the heat dissipation structure 25, thereby playing an auxiliary heat dissipation role for the high temperature airflow.

[0065] A cylindrical structure is provided at the rear end of the bracket plate 242 and is inserted into the circular hole. A threaded hole is provided at the rear end of the cylindrical structure. A threaded column is provided at the front end of the positioning block 244, which is screwed into the threaded hole to complete the connection between the positioning block 244 and the bracket plate 242. At the same time, the bracket plate 242, the heat conducting rod 243 and the positioning block 244 can rotate relative to the threaded block 241 to ensure that when the threaded block 241 is screwed into the threaded groove, the heat conducting rod 243 can be smoothly inserted into the heat conducting slot 2211.

[0066] Specifically, if Fig.15As shown, the heat dissipation structure 25 includes a mounting block 251, a heat conductive block 252 and a heat dissipation rod 253. A slot 254 matching the plug-in block 245 is provided on the front surface of the mounting block 251. A through hole is provided in the middle of the front surface of the mounting block 251, and the heat conductive block 252 is fixedly installed in the through hole. The heat dissipation rod 253 is evenly and fixedly installed on the rear surface of the heat conductive block 252.

[0067] The cooperation between the insert block 245 and the slot 254 realizes the connection between the heat dissipation structure 25 and the heat conduction structure 24 .

[0068] The heat is in the heat dissipation structure 25 , passes through the heat conducting block 252 , and then dissipated from the heat dissipation rod 253 .

[0069] Embodiment 3

[0070] like Fig.16 As shown, the difference from the first and second embodiments is that the medium in the heat exchange and cooling structure 23 is liquid, generally water.

[0071] Therefore, no air outlet 2311 is set on the surface of the annular tube 231 in the heat exchange and cooling structure 23, and no guide hole 2321 is set on the surface of the spiral tube 232. The connecting tube 233 is connected to the external water pipe. One connecting tube 233 is connected to the water inlet pipe, and the other connecting tube 233 is connected to the water outlet pipe. The water flows from one connecting tube 233 to a group of spiral tubes 232, and then flows to another group of spiral tubes 232 after reaching the annular tube 231, and finally flows out from the other connecting tube 233. The external water pipe is connected to an external circulating water tank to realize the recycling of water resources and cool down the high-temperature airflow.

[0072] Heat exchange between the liquid and the high-temperature airflow is carried out through the tube walls of the annular tube 231 and the spiral tube 232 .

[0073] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present invention. As long as these changes do not deviate from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A circuit breaker arc extinguishing chamber shielding cover structure that is easy to dissipate heat, characterized in that: It includes a static contact end and a shielding cover structure, wherein the shielding cover structure includes a connecting end, a shielding cover and a heat exchange and cooling structure, wherein the connecting end is assembled at the rear end of the static contact end, the shielding cover is assembled in the connecting end, and the heat exchange and cooling structure is assembled between the connecting end and the shielding cover; The connecting end includes a guide tube and an outer guide cover, and the outer guide cover is fixedly mounted on the outer surface of the guide tube, a conical protrusion is arranged at the bottom of the inner cavity of the shielding cover, and air guide ports are evenly arranged at the open end of the shielding cover; The heat exchange and cooling structure comprises an annular tube and a spiral tube, wherein there are two spiral tubes in total, the rotation direction and spacing of the two spiral tubes are the same, the axes of the rear end ports of the two spiral tubes are 180°, one end of the two spiral tubes is connected to the annular tube, and the other ends of the two spiral tubes are fixedly installed with connecting tubes, the annular tube and the spiral tube are located between the guide tube and the shielding cover, and the connecting tube passes through the shielding cover toward the outside, half of the difference in diameter between the guide tube and the shielding cover is the same as the diameter of the spiral tube, and the spiral tube divides the space between the guide tube and the shielding cover into a spiral channel; The outer surface of the shielding cover is provided with small holes in a spiral shape, and the small holes are connected to the spiral channel; The outer surface of the annular tube is provided with an air outlet corresponding to the air guide port, and the outer surface of the spiral tube is provided with a guide hole, which is inclined relative to the spiral tube, and the angle between the axis of the guide hole and the center line of the spiral tube is an acute angle.

2. The shield cover structure of the arc extinguishing chamber of a circuit breaker with easy heat dissipation according to claim 1, characterized in that: The static contact end includes a static contact seat, a static arc contact and a contact finger, and the front end of the guide tube is plugged into the rear end of the static contact seat, a static main contact seat is fixedly installed on the front side of the inner surface of the static contact seat, a support plate is fixedly installed on the rear side of the inner surface of the static contact seat, and the static arc contact is installed on the support plate, a contact finger frame is installed at the front end of the static main contact seat, and the contact finger is installed on the contact finger frame, and a guide cover is installed on the inner side of the static main contact seat.

3. The shield cover structure of the arc extinguishing chamber of a circuit breaker with easy heat dissipation according to claim 2, characterized in that: The rear end of the inner surface of the static contact seat is provided with a thread, and the rear side of the inner surface of the static contact seat is threadedly connected with an auxiliary flow guide cover, and the rear end surface of the auxiliary flow guide cover is fixedly installed with a fixing column.

4. The shield cover structure of the arc extinguishing chamber of a circuit breaker with easy heat dissipation according to claim 3, characterized in that: The diameter of the guide tube is greater than the diameters of the guide cover and the auxiliary guide cover.

5. A shielding cover structure of an arc extinguishing chamber of a circuit breaker with easy heat dissipation according to claim 4, characterized in that: A shielding cover mounting block is fixedly mounted on the inner surface of the outer guide cover, the inner surface of the shielding cover mounting block and the outer surface of the opening end of the shielding cover are provided with matching threads, and the shielding cover is screwed into the shielding cover mounting block.

6. A shielding cover structure of an arc extinguishing chamber of a circuit breaker with easy heat dissipation according to claim 5, characterized in that: A heat-conducting structure is installed at the rear end of the shielding cover, and a heat dissipation structure is installed at the rear end of the heat-conducting structure. A threaded groove is provided on the rear end surface of the shielding cover, and a conical groove corresponding to the conical protrusion is provided in the threaded groove, and the heat-conducting structure is installed in the conical groove.

7. A shielding cover structure of a circuit breaker arc extinguishing chamber with easy heat dissipation according to claim 6, characterized in that: The heat-conducting structure includes a threaded block, a bracket plate, a heat-conducting rod and a positioning block, the threaded block is screwed into the threaded groove, a round hole is provided on the front surface of the threaded block, and the bracket plate is inserted into the round hole, a heat-conducting rod is evenly fixedly installed on the front surface of the bracket plate, and a heat-conducting slot corresponding to the heat-conducting rod is evenly provided on the outer surface of the conical protrusion, the positioning block is rotatably assembled on the rear end of the threaded block, and the front end of the positioning block is fixedly connected to the rear end of the bracket plate, and an insert block is evenly fixedly installed on the rear surface of the threaded block.

8. The shield cover structure of the arc extinguishing chamber of a circuit breaker with easy heat dissipation according to claim 7, characterized in that: The heat dissipation structure includes a mounting block, a heat conductive block and a heat dissipation rod. A slot matching the plug-in block is provided on the front surface of the mounting block, a through hole is provided in the middle of the front surface of the mounting block, and the heat conductive block is fixedly installed in the through hole. The heat dissipation rod is evenly and fixedly installed on the rear surface of the heat conductive block.

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