CN212114510U - High-flux switch equipment cooling structure - Google Patents
High-flux switch equipment cooling structure Download PDFInfo
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- CN212114510U CN212114510U CN202021234170.3U CN202021234170U CN212114510U CN 212114510 U CN212114510 U CN 212114510U CN 202021234170 U CN202021234170 U CN 202021234170U CN 212114510 U CN212114510 U CN 212114510U
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Abstract
The utility model discloses a high current switchgear cooling structure, a central through-flow part for cooling in high current switchgear's the box, the box inner seal has the fluid to realize the insulation between box and the central through-flow part, high current switchgear cooling structure is including the honeycomb duct that admits air that communicates in proper order, heat dissipation honeycomb duct and return air honeycomb duct, the air inlet setting of honeycomb duct that admits air is in the top of box, the gas outlet setting of return air honeycomb duct is in the bottom of box, one section body of honeycomb duct that admits air is provided with parallelly connected bifurcation honeycomb duct, be provided with the pump body in the bifurcation honeycomb duct, be provided with the valve on this section body, be provided with the fin on the heat dissipation honeycomb duct. The passive cooling and the pump circulation active cooling based on the thermosiphon effect are integrated. The passive cooling mode heat dissipation system has no power consumption, and the pump only plays a role of forced circulation in the active cooling mode, so the whole power consumption of the heat dissipation system is low. The heat dissipation mode is easy to implement and the implementation cost is low.
Description
Technical Field
The utility model relates to a high-pass flow switchgear cools off technical field, especially relates to a high-pass flow switchgear cooling structure.
Background
Compared with the switchgear of a power transmission link, the generator outlet switchgear of a large power plant has the characteristics of low rated voltage and high rated current (for a generator set with more than 250MW, the rated current of the generator outlet switchgear generally exceeds 10000A). Therefore, heat dissipation issues of high-current switching devices need to be considered. In addition, when the switchgear loses the self-contained fan or the pipeline bus is forced to cool, the switchgear itself must have the capability of carrying a certain current, and the stronger the capability is, the better the capability is.
With the gradual advance of economic structure adjustment and electric energy substitution in China, the demand on electric energy is continuously increased, and the capacity of a single generator set tends to be expanded. Generators are the most important equipment of power plants and are expensive. Generator outlet switchgear is a critical device ensuring rapid removal of generator outlet faults, and generator set outlet switchgear has gained increasing use in large nuclear, hydroelectric and coal power plants.
The switch equipment for the generator usually adopts a three-phase box-divided closed structure, namely three-phase boxes are mutually separated and grounded, and each box is internally provided with a conductor for passing current. The cooling has three modes, the first is natural cooling, the second is self-cooling, and the third is IPB (isolated phase bus) forced air cooling.
The natural cooling method is that the surface of the circulating part is provided with a radiating fin, heat is transferred to the closed air by increasing the contact area of the circulating part and the closed air, then the heat is transferred to the box body of the switch device by the air, and finally the box body releases the heat to the surrounding air.
The self-cooling mode is that a fan is added on the switchgear (generally the top) to force the air in the box body to flow, so as to form the direct air blowing effect on the through-flow component and enhance the heat exchange between the through-flow component and the closed air and between the closed air and the box body. The IPB forced air cooling mode utilizes forced circulation of air in a closed bus communicated with the switch equipment to carry out air cooling.
Self cooling and IPB forced air cooling belong to active cooling, an external power supply is required to drive cooling equipment such as a fan, and the electric energy loss in long-term operation cannot be ignored. And when the active cooling is lost, the switch equipment at the outlet of the generator must meet the requirement that the temperature rise does not exceed the standard at a certain output reduction rate. The natural cooling belongs to passive cooling, and does not need additional electric energy. But passive cooling generally has poorer heat dissipation properties than active cooling. Therefore, the cooling capacity and the current-carrying capacity of the switching equipment for the generator are enhanced on the premise of saving electric energy, and the method has important significance for development of the switching equipment for the generator.
Therefore, how to provide a cooling structure for a high-current switch device to realize an integrated active heat dissipation and passive heat dissipation manner, and to make the overall power consumption of the heat dissipation system low, the heat dissipation manner easy, and the implementation cost low is a technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a high-current switch device cooling structure to realize integrated active heat dissipation and passive heat dissipation, and make the overall power consumption of the heat dissipation system low, the heat dissipation easy, the implementation cost low.
In order to achieve the above object, the utility model provides a following technical scheme:
a cooling structure of a high-flux switchgear is used for cooling a central flux component in a box body of the high-flux switchgear,
the box body is internally sealed with fluid to realize the insulation between the box body and the central through-flow component,
the high-through-flow switchgear cooling structure comprises an air inlet guide pipe, a heat dissipation guide pipe and an air return guide pipe which are sequentially communicated, wherein an air inlet of the air inlet guide pipe is arranged above the box body, an air outlet of the air return guide pipe is arranged at the bottom of the box body,
a branch flow guide pipe connected in parallel is arranged on one section of the air inlet flow guide pipe, a pump body is arranged in the branch flow guide pipe, a valve is arranged on one section of the pipe body,
and the heat dissipation guide pipe is provided with a heat dissipation fin.
Preferably, the air inlet of the air inlet guide pipe is arranged at the top or above the side of the box body.
Preferably, the air inlet of the air inlet guide pipe is arranged right above the central through-flow member.
Preferably, the air inlet guide pipe, the heat radiation guide pipe and the air return guide pipe are all provided in plurality.
Preferably, the central through-flow member is disposed at the center of the box body, the air inlet guide pipe is disposed right above the central through-flow member,
wherein one side of one to a plurality of the heat dissipation draft tubes, which faces the central through-flow component, extends to be communicated with one to a plurality of the air return draft tubes,
and the other one or more heat dissipation guide pipes extend towards the other side of the central through-flow component and are communicated with the other one or more air return guide pipes.
Preferably, the air return guide pipe is arranged on the side wall of the box body.
Preferably, a temperature sensor is further arranged inside the box body, a data acquisition and processing unit is arranged outside the box body,
the valve is an electric control valve,
the data acquisition and processing unit is in signal connection with the temperature sensor, the electric control valve and the pump body.
Preferably, a direct blowing fan is coupled to the heat sink.
Preferably, the pump body has a plurality of airflow circulation positions.
The utility model provides a cooling structure of high-flux switch equipment, which is used for cooling a central through-flow component in a box body of the high-flux switch equipment,
the box body is internally sealed with fluid to realize the insulation between the box body and the central through-flow component,
the high-through-flow switchgear cooling structure comprises an air inlet guide pipe, a heat dissipation guide pipe and an air return guide pipe which are sequentially communicated, wherein an air inlet of the air inlet guide pipe is arranged above the box body, an air outlet of the air return guide pipe is arranged at the bottom of the box body,
a branch flow guide pipe connected in parallel is arranged on one section of the air inlet flow guide pipe, a pump body is arranged in the branch flow guide pipe, a valve is arranged on one section of the pipe body,
and the heat dissipation guide pipe is provided with a heat dissipation fin.
The utility model provides a high flux switchgear cooling structure, under the passive cooling mode, the valve is opened, and the pump body does not start. The temperature gradient in the fluid forms a density gradient, the fluid heated by the switch device, namely the central through-flow component moves towards the top of the box body including the air inlet under the action of density difference pushing and gravity, then the hot fluid in the switch device is led out in an accelerating mode by utilizing the air inlet guide pipe, the fluid is cooled by the radiating fins on the radiating heat conducting pipe, the heat of the hot fluid is exchanged to the surrounding air, the cooled fluid flows back to the bottom of the switch device through the air return guide pipe under the action of gravity, and then flows to the top of the box body near the through-flow component, so that a complete natural convection process is formed.
In the active cooling mode, the valve is closed, the pump body is started, and the fluid passes through the branched flow guide pipe. The cooling system is forced convection working condition.
The utility model provides a high-pass flow switchgear cooling structure has integrateed passive cooling and pump circulation initiative cooling two kinds of modes based on the thermosiphon effect. The device is simple in structure and does not need a fine and complex structure; the hot fluid is micro-positive pressure air, and is not required to be strictly sealed with other working media; the heat dissipation system can perform dynamic self-adaptation according to the through-current requirements of currents with different magnitudes; the hot fluid is led out of the box body, and the heat dissipation mainly depends on external radiating fins, so that the heat dissipation efficiency is high; the passive cooling mode heat dissipation system has no power consumption, and the pump only plays a role of forced circulation in the active cooling mode, so the whole power consumption of the heat dissipation system is low. Generally, the heat dissipation mode is easy to implement, and the implementation cost is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cooling structure of a high-flux switchgear according to an embodiment of the present invention;
fig. 2 is a schematic side view of a cooling structure of a high-flux switchgear according to an embodiment of the present invention.
In the above FIGS. 1-2:
the device comprises a single phase 1, a box body 2, a central through-flow component 3, a fluid 4, an air inlet guide pipe 5, a branching guide pipe 6, a heat dissipation guide pipe 7, a radiating fin 8, an air return guide pipe 9, a temperature sensor 10, an electric control valve 11, a pump body 12, a pump power supply 13, a data acquisition and processing unit 14, an air inlet 15 and an air outlet 16.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Interpretation of terms:
switching device for generator: including generator circuit breakers, disconnectors, earthing switches, starting switches, etc. Generally, a switchgear assembly consisting of generator circuit breaker/disconnector/earthing switch is used at the generator outlet. The equipment needs to carry the rated current in the power generation state. The rated voltage of the switch equipment for the generator is below 38kV, and the rated current is thousands to tens of thousands of amperes. The switch device for the generator consists of a central through-flow component and a box body surrounding the through-flow component, and dry air which is not communicated with outside air is sealed in the box body and is used as an insulating medium between the through-flow component and the box body.
Temperature rise: i.e. the extent to which the switchgear temperature rises compared to the surrounding air. According to the temperature rise regulation of GB/T11022-20114.5.2, the maximum temperature rise of the switch equipment cannot exceed 75K. The larger the throughput of the same equipment, the higher the temperature rise, thus limiting the throughput.
Referring to fig. 1 to 2, fig. 1 is a schematic structural diagram of a cooling structure of a high-flux switchgear according to an embodiment of the present invention; fig. 2 is a schematic side view of a cooling structure of a high-flux switchgear according to an embodiment of the present invention.
The utility model provides a cooling structure of high-flux switch equipment, which is used for cooling a central through-flow component 3 in a box body 2 of the high-flux switch equipment,
the box body 2 is internally sealed with fluid 4 to realize the insulation between the box body 2 and the central through-flow component 3,
the high-through-flow switchgear cooling structure comprises an air inlet guide pipe 5, a heat dissipation guide pipe 7 and an air return guide pipe 9 which are sequentially communicated, wherein an air inlet 15 of the air inlet guide pipe 5 is arranged above the box body 2, an air outlet 16 of the air return guide pipe 9 is arranged at the bottom of the box body 2,
a branch flow guide pipe 6 connected in parallel is arranged on one section of the air inlet flow guide pipe 5, a pump body 12 is arranged in the branch flow guide pipe 6, a valve is arranged on one section of the pipe body of the air inlet flow guide pipe 5 connected in parallel with the branch flow guide pipe 6,
the heat dissipation flow guide pipe 7 is provided with a heat dissipation fin 8.
The utility model provides a high flux switchgear cooling structure, under the passive cooling mode, the valve is opened, and pump body 12 does not start. The temperature gradient in the fluid 4 forms a density gradient, the fluid 4 heated by the switch device, namely the central through-flow component 3 moves towards the top of the box body 2 including the air inlet 15 under the action of density difference pushing and gravity, the hot fluid in the switch device is accelerated and led out by the air inlet guide pipe 5, the fluid 4 is cooled by the radiating fins 8 on the radiating heat conduction pipe 7, the heat of the hot fluid is exchanged into the surrounding air, the cooled fluid 4 flows back to the bottom of the switch device through the air return guide pipe 9 under the action of gravity, and then flows to the top of the box body 2 through the vicinity of the central through-flow component 3, so that a complete natural convection process is formed.
In the active cooling mode, the valve is closed, the pump body 12 is actuated, and the fluid 4 passes through the branched flow guide 6. The cooling system is forced convection working condition.
The utility model provides a high-pass flow switchgear cooling structure has integrateed passive cooling and pump circulation initiative cooling two kinds of modes based on the thermosiphon effect. The thermal cycling motion is known as the thermosiphon effect. The device is simple in structure and does not need a fine and complex structure; the hot fluid is micro-positive pressure air, and is not required to be strictly sealed with other working media; the heat dissipation system can perform dynamic self-adaptation according to the through-current requirements of currents with different magnitudes; the hot fluid is led out of the box body 2, and the heat dissipation mainly depends on the external radiating fins 8, so that the heat dissipation efficiency is high; the passive cooling mode heat dissipation system has no power consumption, and the pump only plays a role of forced circulation in the active cooling mode, so the whole power consumption of the heat dissipation system is low. Generally, the heat dissipation mode is easy to implement, and the implementation cost is low.
The utility model provides a high-pass flow switchgear cooling structure, 1, derive box 2 with the hot-fluid, the heat dissipation mainly relies on outside fin 8. 2. The passive cooling mode utilizes the thermosiphon effect to realize the power-free operation of the heat dissipation system in the passive cooling mode. 3. Active heat dissipation and passive heat dissipation modes are integrated, and the dynamic self-adaption circuit is dynamically adaptive to through-current requirements of currents with different magnitudes.
Specifically, the air inlet 15 of the air inlet guide pipe 5 is arranged on the top or side of the box body 2. Generally, the inlet 15 of the inlet flow duct 5 is arranged directly above the central flow-through member 3. A central through-flow member 3 is provided in the centre of the housing 2. The cooling effect is better.
Specifically, the air inlet guide pipe 5, the heat dissipation guide pipe 7 and the air return guide pipe 9 are all provided in plurality. The central through-flow component 3 is arranged in the center of the box body 2, the air inlet guide pipe 5 is arranged right above the central through-flow component 3, one side of one to a plurality of heat dissipation guide pipes 7, which faces the central through-flow component 3, extends to be communicated with one to a plurality of air return guide pipes 9, and the other side of one to a plurality of heat dissipation guide pipes 7, which faces the central through-flow component 3, extends to be communicated with the other to a plurality of air return guide pipes 9. The air return guide pipe 9 is arranged on the side wall of the box body 2.
As shown in fig. 2, which is a schematic diagram of one side, taking the example of arranging three heat dissipation draft tubes 7 on one side, there is an air inlet draft tube 5 between two adjacent heat dissipation draft tubes 7, each heat dissipation draft tube 7 is communicated with an air return draft tube 9, and the three air return draft tubes 9 are arranged at equal intervals along the length direction of the central through-flow component 3.
Specifically, the inside of the box body 2 is further provided with a temperature sensor 10, the outside of the box body 2 is provided with a data acquisition and processing unit 14, the valve is an electric control valve 11, and the data acquisition and processing unit 14 is in signal connection with the temperature sensor 10, the electric control valve 11 and the pump body 12.
Specifically, the heat sink 8 is fitted with a direct blowing fan. The pump body 12 has a plurality of airflow throughput gears.
The utility model provides a high-pass flow switchgear cooling structure is a cooling structure who is applicable to high-pass flow switchgear, has integrateed passive cooling and initiative cooling dual mode, can strengthen the heat-sinking capability of switchgear for the generator to can carry out dynamic adjustment to the heat dissipation according to the current-carrying level.
The utility model provides a high flux switchgear cooling structure, as shown in figure 1 and figure 2.
The switchgear is of three-phase, similarly structured, single-phase 1 comprising a tank 2 and a central through-flow member 3, and the insulation of the two is achieved by a fluid 4 enclosed in the tank 2. The box body 2 is provided with at least one air inlet 15 and at least one air outlet 16 which are butted with a cooling system, the air inlet 15 is positioned at the top or the side upper part of the box body 2, and the air outlet 16 is positioned at the bottom of the box body 2.
The cooling system is composed of an air inlet guide pipe 5, a branching guide pipe 6, a heat dissipation guide pipe 7, a radiating fin 8, an air return guide pipe 9, a temperature sensor 10, an electric control valve 11, a pump body 12, a pump power supply 13 and a data acquisition and processing unit 14.
The temperature sensor 10 is installed inside the tank 2 and is used for collecting temperature data of the fluid 4 in the tank 2.
The intake air guide pipe 5 is provided with an electric control valve 11 for opening and closing the intake air guide pipe 5.
The bifurcation honeycomb duct 6 is connected with the air inlet honeycomb duct 5 in parallel and is provided with a pump body 12, which plays a role of forced convection circulation.
A pump power supply 13 is controlled by the data acquisition and processing unit 14 to supply power to the pump body 12.
The cooling system is divided into two operation modes of passive cooling and active cooling.
In the passive cooling mode, the electric control valve 11 is opened, and the pump body 12 is not started. The density gradient changes due to the temperature gradient in the fluid 4, the fluid 4 heated by the switchgear moves towards the top of the box body 2 including the air inlet 15 under the action of thermosiphon, the hot fluid in the switchgear is accelerated to be led out by using the air inlet guide pipe 5, the fluid 4 is cooled by the cooling fins 8 on the heat dissipation heat conduction pipes 7, the direct blowing fans can be installed on the cooling fins 8, the heat of the hot fluid is exchanged into the surrounding air, the cooled fluid 4 flows back to the bottom of the switchgear through the air return guide pipe 9 under the action of gravity, and then flows to the top of the box body 2 through the vicinity of the central through-flow component 3, so that a complete natural convection process is formed.
In the active cooling mode, the electric control valve 11 is closed, and the pump body 12 is started. The cooling system is forced convection working condition.
The data processing and execution unit 14 receives the measurement data of the fluid temperature sensor 10, switches the cooling system from the passive mode to the active mode after the temperature reaches the set threshold value 1, and controls the rotation speed of the pump body 12 to increase or decrease the fluid convection in the switching device, that is, the air flow caused by the pump body 12 has different gears. The cooling system is switched from the active mode to the passive mode after the temperature is below the set threshold 2. Threshold 1 is greater than threshold 2.
Example (b):
1. in a certain output state of a certain high-current switch device of the generator, the current on the central current component 3 is 10000A, and the temperature measured by the temperature sensor 10 is 355K. The data processing and execution unit 14 controls the electric control valve 11 to be in an open state, the pump body 12 is not started, and the cooling system is in a passive mode. The data processing and executing unit 14 stores an upper temperature threshold 380K and a lower temperature threshold 360K. Under the control of the data processing and execution unit 14, the pump body 14 has 10, 20, 40, 80, 100L/min and other gears.
2. In the state of the enhanced output of the generator, the current on the central through-flow component 3 is 15000A, and the temperature measured by the temperature sensor 10 is 395K.
3. When the measured temperature exceeds the temperature threshold value 380K, the data processing and executing unit 14 sends a closing instruction to the electric control valve 11 and opens the pump body 12, and the cooling system is switched into an active mode. The initial airflow throughput caused by the pump body 12 is 40L/min.
4. After 1min, the temperature measured by the temperature sensor 10 was 383K.
5. The measured temperature still exceeds the temperature threshold value 380K, the data processing and executing unit 14 controls the rotating speed of the pump body 12 to be increased, and the air flow circulation caused by the pump body 12 is 80L/min.
6. After 1min, the temperature measured by the temperature sensor 10 was 370K.
7. The measured temperature is lower than a temperature threshold value 1 and higher than a temperature threshold value 2, the threshold value 1 is 380K, the threshold value 2 is 360K, and the data processing and executing unit 14 controls the rotating speed of the pump body 12 to be unchanged.
8. The generator output is reduced, the current on the central through-flow component 3 is 8000A, and the temperature measured by the temperature sensor 10 is 340K.
9. When the measured temperature is lower than the temperature threshold 2, the data processing and execution unit 14 sends an opening instruction to the electric control valve 11 and closes the pump body 12, and the cooling system is switched into a passive mode.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A high-flux switchgear cooling structure for cooling a central through-flow member in a cabinet of a high-flux switchgear,
the box body is internally sealed with fluid to realize the insulation between the box body and the central through-flow component,
the high-through-flow switchgear cooling structure comprises an air inlet guide pipe, a heat dissipation guide pipe and an air return guide pipe which are sequentially communicated, wherein an air inlet of the air inlet guide pipe is arranged above the box body, an air outlet of the air return guide pipe is arranged at the bottom of the box body,
a branch flow guide pipe connected in parallel is arranged on one section of the air inlet flow guide pipe, a pump body is arranged in the branch flow guide pipe, a valve is arranged on one section of the pipe body,
and the heat dissipation guide pipe is provided with a heat dissipation fin.
2. The high-flux switchgear cooling structure of claim 1, wherein the air inlet of the air inlet guide pipe is disposed above the top or side of the cabinet.
3. The high-flux switchgear cooling structure according to claim 2, wherein the air inlet of the air inlet duct is disposed directly above the central through-flow member.
4. The high-flux switchgear cooling structure of claim 1, wherein the air intake duct, the heat dissipation duct, and the air return duct are all plural.
5. The high-flux switchgear cooling structure according to claim 4, wherein the central through-flow member is disposed at the center of the case, the intake duct is disposed directly above the central through-flow member,
wherein one side of one to a plurality of the heat dissipation draft tubes, which faces the central through-flow component, extends to be communicated with one to a plurality of the air return draft tubes,
and the other one or more heat dissipation guide pipes extend towards the other side of the central through-flow component and are communicated with the other one or more air return guide pipes.
6. The high flux switchgear cooling structure of claim 1, wherein the return air guide is disposed on a sidewall of the cabinet.
7. High flux switchgear cooling structure according to claim 1, characterized in that a temperature sensor is further provided inside the cabinet, a data acquisition and processing unit is provided outside the cabinet,
the valve is an electric control valve,
the data acquisition and processing unit is in signal connection with the temperature sensor, the electric control valve and the pump body.
8. The high-flux switchgear cooling structure of claim 1, wherein the heat sink is fitted with a blow-through fan.
9. The high-flux switchgear cooling arrangement according to claim 1, wherein the pump body has a plurality of airflow flux positions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021234170.3U CN212114510U (en) | 2020-06-29 | 2020-06-29 | High-flux switch equipment cooling structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021234170.3U CN212114510U (en) | 2020-06-29 | 2020-06-29 | High-flux switch equipment cooling structure |
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| CN212114510U true CN212114510U (en) | 2020-12-08 |
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