Tank-type circuit breaker heat dissipation structure

Abstract

The utility model belongs to the field of high-voltage circuit breakers, and discloses a tank-type circuit breaker heat dissipation structure, which can greatly improve the heat dissipation efficiency of a floor tank-type circuit breaker, so that the temperature in the floor tank-type circuit breaker can be quickly reduced to a safe temperature range from high temperature, thereby not only avoiding the influence of high-temperature gas on the breaking performance of the circuit breaker, but also ensuring the safety of the circuit breaker. The ground tank type circuit breaker comprises a first heat dissipation end shell, a second heat dissipation end shell and a third heat dissipation end shell which are arranged at the end part of a tank shell, are sequentially nested in the opening and closing direction and are gradually far away from an arc extinguishing nozzle; a roundabout first heat dissipation channel and an open first heat dissipation ring opening are formed in the nested part of the second heat dissipation end shell and the third heat dissipation end shell; and a second heat dissipation channel and an open second heat dissipation ring opening are formed at the nested part of the first heat dissipation end shell and the second heat dissipation end shell.

Description

Technical Field

[0001] The utility model belongs to the field of high - voltage circuit breakers, and particularly relates to a heat dissipation structure for a tank - type circuit breaker. Background Technique

[0002] The floor - mounted tank - type circuit breaker is a kind of high - voltage circuit breaker. Its characteristic is that the arc - extinguishing chamber is located in a grounded metal box, and the internal SF6 gas is used as the internal insulation and arc - extinguishing medium. Compared with the traditional pillar - type circuit breaker, the shell of the floor - mounted tank - type circuit breaker is made of metal materials such as steel, which makes it more firm and reliable, suitable for use in some special and harsh environments. Moreover, its center of gravity is low and its seismic performance is good. In addition, compared with the pillar - type circuit breaker, the on - site installation of the floor - mounted tank - type circuit breaker is relatively simple and does not require dealing with busbar docking.

[0003] At present, the floor - mounted tank - type circuit breakers all extinguish arcs by the way of mechanical compression work to protect the power grid. This kind of switch is a puffer - type circuit breaker. In practical applications, these traditional solutions have some disadvantages, mainly that a large amount of energy needs to be provided during operation.

[0004] However, the deficiency of the above - mentioned implementation is that a large amount of energy causes the gas temperature in the floor - mounted tank - type circuit breaker to rise rapidly in a short period. And the existing heat dissipation structure is only the heat dissipation through - holes arranged at the ends of the floor - mounted tank - type circuit breaker, resulting in a relatively high temperature inside the floor - mounted tank - type circuit breaker. The high - temperature gas not only affects the insulation performance of the circuit breaker opening, but also easily causes thermal damage to the internal structural components, shortening the service life of the components of the floor - mounted tank - type circuit breaker. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a heat dissipation structure for a tank - type circuit breaker, which can greatly improve the heat dissipation efficiency of the floor - mounted tank - type circuit breaker, enable the temperature inside the floor - mounted tank - type circuit breaker to quickly drop from a high temperature to a safe temperature range. Thus, it not only avoids the influence of high - temperature gas on the opening performance of the circuit breaker, but also avoids the influence of high temperature on the internal structural components, and significantly extends the service life of the components of the floor - mounted tank - type circuit breaker.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A heat dissipation structure for a tank-type circuit breaker. The floor-mounted tank-type circuit breaker has a tank shell, an arc extinguishing chamber and a static arc contact both arranged inside the tank shell. The arc extinguishing chamber is formed with an arc extinguishing nozzle corresponding linearly to the static arc contact along the opening and closing direction, and the arc extinguishing chamber is movable along the opening and closing direction. A shielding cover is provided outside the static arc contact. It is characterized in that it includes: a first heat dissipation end shell, a second heat dissipation end shell and a third heat dissipation end shell, which are arranged at the end of the tank shell and nested in sequence along the opening and closing direction and gradually away from the arc extinguishing nozzle. The nested part of the second heat dissipation end shell and the third heat dissipation end shell forms a tortuous first heat dissipation channel and an open first heat dissipation ring opening; the nested part of the first heat dissipation end shell and the second heat dissipation end shell forms a second heat dissipation channel and an open second heat dissipation ring opening.

[0008] Preferably, there is a connection cavity between the second heat dissipation end shell and the third heat dissipation end shell, and there is no physical contact between the edge contours of the first heat dissipation end shell and the second heat dissipation end shell in the nested part.

[0009] Furthermore, the floor-mounted tank-type circuit breaker further includes an insulating cylinder and a shielding cylinder. The insulating cylinder covers the outer periphery of the arc extinguishing chamber. The shielding cylinder is end-connected to the insulating cylinder and extends towards the third heat dissipation end shell. The first heat dissipation end shell is fixed on the tank shell. The inner wall of the first heat dissipation end shell has a connecting plate portion extending inwards, and the connecting plate portion is fixed on the outer peripheral surface of the insulating cylinder. The inner wall of the second heat dissipation end shell is detachably provided with a connecting ring frame. An assembly flange protruding towards the outside is formed on the outer periphery of the shielding cylinder, and the assembly flange and the connecting ring frame are detachably matched, so that there is no physical contact between the edge contours of the first heat dissipation end shell and the second heat dissipation end shell in the nested part.

[0010] Even further, taking the end of the third heat dissipation end shell far from the arc extinguishing chamber as the end of the shell, the end of the shielding cylinder is detachably matched with the inner wall of the end of the shell, so that there is no physical contact between the edge contours of the second heat dissipation end shell and the third heat dissipation end shell in the nested part, and through-flow holes communicating with the inside of the third heat dissipation end shell are provided on the circumferential surface of the shielding cylinder.

[0011] Even further, the present invention further includes a drainage cone, which is conical and is attached to the inner wall of the end of the shell at the bottom, and the cone tip faces the arc extinguishing nozzle along the opening and closing direction.

[0012] Even further, a detachable arc-shaped heat dissipation plate is also provided around the outer peripheral surface of the third heat dissipation end shell, and a plurality of heat dissipation through holes are formed on the arc-shaped heat dissipation plate.

[0013] Even further, the end of the shell has a shielding assembly through hole, and the shielding cylinder is arranged on the end of the shell through a flange structure at the end by threaded connection through the shielding assembly through hole.

[0014] Further, the connecting plate portion divides the first heat dissipation end housing along the closing and opening direction to form an end housing connection cavity facing the tank housing and an open end housing connection cavity facing the third heat dissipation end housing. The end housing connection cavity and the second heat dissipation end housing form a second heat dissipation channel. A plurality of end housing heat dissipation through holes are formed on the outer peripheral surface of the first heat dissipation end housing corresponding to the end housing connection cavity. The connecting plate portion is formed with through holes on the plate. The through holes on the plate, the end housing connection cavity and the end housing heat dissipation through holes form a third heat dissipation channel.

[0015] Further, a contact fixing frame portion is also formed on the inner wall of the shielding cylinder, and the static arc contact is inserted and arranged on the contact fixing frame portion.

[0016] Further, a torque transmission shaft rod coupled to the torque of an external operating mechanism is also passed through the third heat dissipation end housing. A driving crank arm that can rotate by leverage is passed through the torque transmission shaft rod. Two operating connecting rods are respectively hinged at both ends of the driving crank arm. The two operating connecting rods are respectively connected to the contact fixing frame portion and the entity of the arc extinguishing nozzle. Thus, when the driving crank arm rotates by leverage, the arc extinguishing chamber moves along the closing and opening direction.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. Since the heat dissipation structure of the tank-type circuit breaker of the present utility model includes a first heat dissipation end housing, a second heat dissipation end housing and a third heat dissipation end housing, which are arranged at the end of the tank housing and nested in sequence along the closing and opening direction and gradually away from the arc extinguishing nozzle. The nested part of the second heat dissipation end housing and the third heat dissipation end housing forms a circuitous first heat dissipation channel and an open first heat dissipation ring opening; the nested part of the first heat dissipation end housing and the second heat dissipation end housing forms a second heat dissipation channel and an open second heat dissipation ring opening. Therefore, the present utility model can greatly improve the heat dissipation efficiency of the floor-mounted tank-type circuit breaker through the first heat dissipation channel and the first heat dissipation ring opening, the second heat dissipation channel and the second heat dissipation ring opening, so that the temperature inside the floor-mounted tank-type circuit breaker can quickly drop from a high temperature to a safe temperature range. Thus, not only the influence of high-temperature gas on the breaking performance of the circuit breaker is avoided, but also the internal structural components are not affected by high temperature, and the service life of the components of the floor-mounted tank-type circuit breaker is significantly extended.

[0019] 2. Since there is no physical contact between the edge contours of the nested parts of the second heat dissipation end housing and the third heat dissipation end housing connection cavity, and the first heat dissipation end housing and the second heat dissipation end housing, the first heat dissipation channel and the second heat dissipation channel of the present utility model are formed by the overall intervals between the second heat dissipation end housing and the third heat dissipation end housing, and the overall intervals between the first heat dissipation end housing and the second heat dissipation end housing. Thus, heat dissipation channels are formed in the circumferential direction of the nested part, having a heat dissipation effect, thereby further enhancing the heat dissipation efficiency of the floor-mounted tank-type circuit breaker.

[0020] 3. Since the present utility model further includes a conical drainage cone, the bottom of which is fitted to the inner wall at the end of the housing, and the cone tip faces the arc extinguishing nozzle along the closing and opening direction, when the circuit breaker is opened, the high-temperature gas generated by the arc extinguishing nozzle is accelerated when passing through the conical surface of the drainage cone, thus further enhancing the heat dissipation efficiency of the dead tank type circuit breaker.

[0021] 4. Since a detachable arc-shaped heat dissipation plate is further arranged around the outer peripheral surface of the third heat dissipation end shell of the present utility model, a plurality of heat dissipation through holes are formed on the arc-shaped heat dissipation plate, the inner wall at the end of the housing has an annular assembly ring groove, and the shielding cylinder is erected on the assembly ring groove through a stepped structure at the end and is detachably matched with the side wall of the assembly ring groove, therefore, by removing the arc-shaped heat dissipation plate, the present utility model can conveniently assemble the shielding cylinder into the interior of the assembly ring groove.

[0022] 5. Since the connecting plate part of the present utility model divides the first heat dissipation end shell along the closing and opening direction to form an end shell connection cavity facing the tank shell and an open end shell connection cavity facing the third heat dissipation end shell, the end shell connection cavity and the second heat dissipation end shell form a second heat dissipation channel, a plurality of end shell heat dissipation through holes are formed on the outer peripheral surface of the first heat dissipation end shell corresponding to the end shell connection cavity, the connecting plate part is formed with through holes on the plate, and the through holes on the plate, the end shell connection cavity and the end shell heat dissipation through holes form a third heat dissipation channel, therefore, the present utility model further provides a third heat dissipation channel, further enhancing the heat dissipation efficiency of the dead tank type circuit breaker.

[0023] 6. Since a torque transmission shaft rod coupled with the torque of an external operating mechanism is further arranged in the third heat dissipation end shell of the present utility model, a driving crank arm capable of lever rotation is arranged on the torque transmission shaft rod, two operating connecting rods are respectively hinged at both ends of the driving crank arm, and the two operating connecting rods are respectively connected with the contact fixing frame part and the entity of the arc extinguishing nozzle, so that when the driving crank arm rotates in a lever manner, the arc extinguishing chamber moves along the closing and opening direction, therefore, through the optimized setting of the compactness of the structure, the present utility model significantly improves the breaking capacity of the circuit breaker, reduces the mechanical wear of the breaking clutch contact entity, prolongs the service life of the opening degree of the circuit breaker, and since the torque transmission shaft rod, the driving crank arm and the operating connecting rods are all detachable structures, the relevant maintenance work is extremely facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the heat dissipation structure of the tank type circuit breaker according to the embodiment of the present utility model;

[0025] Figure 2 Schematic diagram of the cooperation of the second heat dissipation end shell, the third heat dissipation end shell, the connecting ring frame and the shielding cylinder according to the embodiment of the present utility model;

[0026] Figure 3A schematic plan view of the parts related to the second heat dissipation end shell and the third heat dissipation end shell of the embodiment of the present utility model.

[0027] In the figure: 100, the heat dissipation structure of the pot-type circuit breaker; G, the pot shell; G1, the arc extinguishing chamber; G11, the arc extinguishing nozzle; G2, the static arc contact; G3, the insulating cylinder; G31, the assembly flange; G4, the shielding cylinder; G41, the current-carrying through hole; G42, the assembly flange; G43, the contact fixing frame part; D, the closing and opening direction; 10, the first heat dissipation end shell; 10a, the second heat dissipation channel; 10b, the second heat dissipation ring opening; 10c, the end shell connection cavity; 10d, the end shell nesting cavity; 10e, the end shell heat dissipation through hole; 11, the connecting plate part; 20, the second heat dissipation end shell; 20a, the first heat dissipation channel; 20b, the first heat dissipation ring opening; 21, the connecting ring frame; 30, the third heat dissipation end shell; 30a, the end of the shell; 30b, the shielding assembly through hole; 31, the arc-shaped heat dissipation plate; 31a, the heat dissipation through hole; 40, the drainage cone; 50, the operating unit; 51, the torque transmission shaft rod; 52, the driving crank arm; 53, the operating connecting rod. Specific embodiments

[0028] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the following embodiments will specifically describe the heat dissipation structure of the pot-type circuit breaker of the present utility model in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present utility model, but does not constitute a limitation to the present utility model.

[0029] As Figures 1 to 3 shown, the floor-standing pot-type circuit breaker in this embodiment includes a pot shell G, and an arc extinguishing chamber G1, a static arc contact G2, an insulating cylinder G3, and a shielding cylinder G4 all arranged inside the pot shell G.

[0030] An arc extinguishing nozzle G11 corresponding to the static arc contact G2 in a straight line along the closing and opening direction D is fixedly arranged in the arc extinguishing chamber G1, and the arc extinguishing chamber G1 can move integrally along the closing and opening direction D. The insulating cylinder G3 covers the outer periphery of the arc extinguishing chamber G1, the shielding cover G4 covers the outer periphery of the static arc contact, the shielding cylinder is terminated with the insulating cylinder G3, and the shielding cylinder G4 extends along the closing and opening direction D towards the third heat dissipation end shell. A contact fixing frame part G43 is also formed on the inner wall of the shielding cylinder G4, and the static arc contact G2 is inserted and arranged on the contact fixing frame part G43. Specifically, the contact fixing frame part G43 extends to the opposite sides of the shielding cylinder G4, the static arc contact G2 is inserted at the center of the shielding cylinder G4, and the inside of the shielding cylinder G4 is separated into two hollow structures by the contact fixing frame part G43.

[0031] Specifically, a moving finger (not shown in the drawings) corresponding to the static arc contact G2 along the opening and closing direction D is fixedly provided inside the arc extinguishing chamber G1. When the arc extinguishing chamber G1 moves, the static arc contact G2 moves relative to the arc extinguishing nozzle G11, inserts into the arc extinguishing nozzle G11 and cooperates with the moving finger, or separates from the moving finger and moves away from the arc extinguishing nozzle G11, thereby realizing the opening and closing of the circuit breaker.

[0032] The heat dissipation structure 100 of the pot-type circuit breaker includes a first heat dissipation end shell 10, a second heat dissipation end shell 20, a third heat dissipation end shell 30, a drainage cone 40, and an operating unit 50.

[0033] The first heat dissipation end shell 10, the second heat dissipation end shell 20, and the third heat dissipation end shell 30 are arranged at the end of the pot shell G and are nested in sequence along the opening and closing direction D and gradually move away from the arc extinguishing nozzle G11. The shielding cylinder G4 is closer to the third heat dissipation end shell 30 than the insulating cylinder. Both the drainage cone 40 and the operating unit 50 are located inside the third heat dissipation end shell 30, and the operating unit 50 is used to introduce the torque of the external rotating operating mechanism into the pot shell G.

[0034] The first heat dissipation end shell 10 is fixedly provided on the pot shell G. The inner wall of the first heat dissipation end shell 10 has a connecting plate portion 11 extending inward. The connecting plate portion 11 is fixedly provided on the outer peripheral surface of the insulating cylinder G3. Specifically, the connecting plate portion 11 has a middle through hole for passing through the insulating cylinder G3, and the insulating cylinder G3 is fixed to the connecting plate portion 11 through a flange.

[0035] The connecting plate portion 11 divides the first heat dissipation end shell 10 along the opening and closing direction D to form an end shell connection cavity 10c facing the pot shell G and an open end shell connection cavity 10d facing the third heat dissipation end shell 30. The end shell connection cavity 10c and the second heat dissipation end shell 20 form a second heat dissipation channel 10a. Thus, the second heat dissipation channel 10a formed in the nested part of the first heat dissipation end shell 10 and the second heat dissipation end shell 20 is tortuous and forms an open second heat dissipation ring opening 10b.

[0036] A connecting ring frame 21 is detachably provided on the inner wall of the second heat dissipation end shell 20. An assembly flange G42 protruding outward is formed on the outer periphery of the shielding cylinder G4. The assembly flange G42 and the connecting ring frame 21 are detachably matched, so that the edge contours of the first heat dissipation end shell 10 and the second heat dissipation end shell 20 have no physical contact in the nested part.

[0037] A plurality of end shell heat dissipation through holes 10e are formed on the outer peripheral surface of the first heat dissipation end shell 10 corresponding to the end shell connection cavity 11c. The connecting plate portion 11 forms a through hole on the plate (not shown in the drawings). The through hole on the plate, the end shell connection cavity 11c, and the end shell heat dissipation through hole 11e form a third heat dissipation channel (not shown in the drawings).

[0038] The end of the third heat dissipation end shell 30 away from the arc extinguishing chamber G1 is taken as the shell end 30a, and the end of the shielding cylinder G4 is detachably fitted with the inner wall of the shell end 30a, so that the edge contours of the second heat dissipation end shell 20 and the third heat dissipation end shell 30 have no physical contact at the nested part, that is, the first heat dissipation channel 20a formed at the nested part of the second heat dissipation end shell 20 and the third heat dissipation end shell 30 is tortuous, and an open first heat dissipation ring opening 20b is formed. Specifically, the shell end 30a has a shielding assembly through hole 30b, and the shielding cylinder G4 is arranged on the shell end 30a through threaded connection via the shielding assembly through hole 30b through a flange structure (not shown in the drawing) at the end.

[0039] And on the circumferential surface of the part of the shielding cylinder G4 located inside the third heat dissipation end shell 30, there are through-flow holes G41 communicating with the inside of the third heat dissipation end shell 30. Specifically, when the circuit breaker opens, the hot air flow generated at the arc extinguishing nozzle G11 flows into the third heat dissipation end shell 30 through the insulating cylinder G3, the shielding cylinder G4 and the through-flow holes G41, and at the same time, it mainly dissipates heat through three paths: the first heat dissipation channel 20a and the first heat dissipation ring opening 20b, the second heat dissipation channel 10a and the second heat dissipation ring opening 10b, and the third heat dissipation channel and the end shell heat dissipation through hole 10e.

[0040] A detachable arc-shaped heat dissipation plate 31 is also arranged around the outer circumferential surface of the third heat dissipation end shell 30, and a plurality of heat dissipation through holes 31a are formed on the arc-shaped heat dissipation plate 31, so as to form secondary heat dissipation for the hot air flow inside the third heat dissipation end shell 30.

[0041] The drainage cone 40 is conical, the bottom is fitted on the inner wall of the shell end 30a, and the cone tip faces the arc extinguishing nozzle G11 along the opening and closing direction D. When the hot air flow inside the third heat dissipation end shell 30 flows through the drainage cone 40, the profile of the drainage cone 40 accelerates the hot air flow.

[0042] The operating unit 50 includes a torque transmission shaft rod 51, a driving crank arm 52 and two operating connecting rods 53.

[0043] The torque transmission shaft rod 51 is arranged inside the third heat dissipation end shell 30 and is torque-coupled with an external operating mechanism (not shown in the drawing). The driving crank arm 52 is arranged on the torque transmission shaft rod 51, and the driving crank arm 52 can rotate as a shaft lever around the torque transmission shaft rod 51. The two operating connecting rods 53 are respectively hinged at both ends of the driving crank arm 52, and the two operating connecting rods 53 are arranged towards the arc extinguishing chamber G1. The two operating connecting rods 53 are respectively connected to the contact fixing frame part G43 and the arc extinguishing nozzle G11 in a solid manner. Thus, when the driving crank arm 52 rotates as a lever, the arc extinguishing chamber G1 moves along the opening and closing direction D. In this embodiment, the operating connecting rod 53 is a bent rod to avoid interference with related components during operation.

[0044] The above embodiments are preferred cases of the present utility model and are not used to limit the protection scope of the present utility model. Various deformations or modifications that can be made by those of ordinary skill in the art without creative labor within the scope of the appended claims still fall within the protection scope of this patent.

Claims

1. A heat dissipation structure of a tank type circuit breaker, wherein the floor-standing tank type circuit breaker comprises a tank shell, and an arc extinguishing chamber and a static arc contact both arranged in the tank shell, wherein the arc extinguishing chamber is formed with an arc extinguishing nozzle corresponding to the static arc contact in a straight line along a switching direction, and the arc extinguishing chamber is movable along the switching direction, and an outer cover of the static arc contact is provided with a shielding cover, wherein: include: The first heat dissipation end shell, the second heat dissipation end shell and the third heat dissipation end shell are arranged at the end of the tank shell and are nested in sequence along the opening and closing direction and gradually away from the arc extinguishing nozzle. The nested parts of the second heat dissipation end shell and the third heat dissipation end shell form a circuitous first heat dissipation channel and an open first heat dissipation ring; the nested parts of the first heat dissipation end shell and the second heat dissipation end shell form a second heat dissipation channel and an open second heat dissipation ring.

2. The heat dissipation structure of a tank type circuit breaker according to claim 1, characterized in that: in, The second heat dissipation end shell and the third heat dissipation end shell are connected to the cavity, and the edge contours of the first heat dissipation end shell and the second heat dissipation end shell have no physical contact in the nesting part.

3. The heat dissipation structure of a tank type circuit breaker according to claim 2, characterized in that: in, The floor-standing tank circuit breaker further comprises an insulating cylinder and a shielding cylinder, wherein the insulating cylinder cover is arranged on the outer periphery of the arc extinguishing chamber, the shielding cylinder is terminated with the insulating cylinder and the shielding cylinder extends toward the third heat dissipation end shell, The first heat dissipation end shell is fixedly mounted on the tank shell, and the inner wall of the first heat dissipation end shell has a connecting plate portion extending inwardly, and the connecting plate portion is fixedly mounted on the outer peripheral surface of the insulating cylinder. The inner wall of the second heat dissipation end shell is detachably provided with a connecting ring frame, and the outer periphery of the shielding tube is formed with an assembly flange protruding toward the outside, and the assembly flange and the connecting ring frame are detachably matched, so that the edge contours of the first heat dissipation end shell and the second heat dissipation end shell have no physical contact in the nesting part.

4. The heat dissipation structure of the tank type circuit breaker according to claim 3, characterized in that: in, The end of the third heat dissipation end shell away from the arc extinguishing chamber is used as the shell end, and the end of the shielding tube is detachably matched with the inner wall of the shell end, so that the edge contours of the second heat dissipation end shell and the third heat dissipation end shell have no physical contact in the nested part, and the circumferential surface of the shielding tube has a flow hole connected to the interior of the third heat dissipation end shell.

5. The heat dissipation structure of tank type circuit breaker according to claim 4, characterized in that: Also includes: The drainage cone is in a cone shape, with its bottom being fitted on the inner wall of the end of the shell, and its tip facing the arc extinguishing nozzle along the opening and closing direction.

6. The heat dissipation structure of a tank type circuit breaker according to claim 4, characterized in that: in, The outer peripheral surface of the third heat dissipation end shell is also surrounded by a detachable arc-shaped heat dissipation plate, and a plurality of heat dissipation through holes are formed on the arc-shaped heat dissipation plate.

7. The heat dissipation structure of a tank type circuit breaker according to claim 6, characterized in that: in, The end of the shell has a shielding assembly through hole, and the shielding cylinder is arranged on the end of the shell through a flange structure at the end and through the shielding assembly through hole by threaded connection.

8. The heat dissipation structure of a tank type circuit breaker according to claim 3, characterized in that: in, The connecting plate portion separates the first heat dissipation end shell along the opening and closing direction to form an end shell connection cavity facing the tank shell and an end shell connection cavity facing the third heat dissipation end shell and open. The end shell connection cavity and the second heat dissipation end shell form the second heat dissipation channel. A plurality of end shell heat dissipation through holes are formed on the outer peripheral surface of the first heat dissipation end shell corresponding to the end shell connection cavity, and a plate through hole is formed on the connecting plate portion. The plate through holes, the end shell connection cavity and the end shell heat dissipation through holes form a third heat dissipation channel.

9. The heat dissipation structure of a tank type circuit breaker according to claim 3, characterized in that: in, The inner wall of the shielding cylinder also forms a contact fixing frame portion, and the static arc contact is inserted and arranged on the contact fixing frame portion.

10. The heat dissipation structure of a tank type circuit breaker according to claim 9, characterized in that: in, A torque transmission shaft rod coupled with the torque of the external operating mechanism is also passed through the third heat dissipation end shell, and a driving crank arm that can be rotated by a lever is passed through the torque transmission shaft rod, and two operating connecting rods are respectively hingedly connected to the two ends of the driving crank arm, and the two operating connecting rods are respectively connected to the contact fixing frame and the entity of the arc extinguishing nozzle, so that when the driving crank arm lever rotates, the arc extinguishing chamber moves along the opening and closing direction.

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