A self-circulating evaporative cooling device with a bottom-mounted condenser

Abstract

The present invention discloses a self-circulating evaporative cooling device with a bottom-mounted condenser. The evaporable liquid medium in the first evaporator is heated and evaporated to generate a gas-liquid mixed medium which enters the upper part and the heat-conducting pipe. The evaporable liquid medium in the second evaporator is heated and evaporated to generate a gas-liquid mixed medium which enters the upper closed space. The generated gas pressure growth rate is greater than the gas pressure growth rate in the first evaporator and the heat-conducting pipe. The second check valve is opened to allow the gas-liquid mixed medium to enter the first evaporator. At the same time, the evaporable liquid medium in the lower part of the second evaporator is also ejected and flows into the first evaporator. At this time, the gas pressure in the condenser is released and is lower than the gas pressure in the first evaporator and the heat-conducting pipe connected thereto. The first check valve is opened, and the gas-liquid mixed medium in the heat-conducting pipe enters the condenser, is cooled by absorbing heat, and then changes into the evaporable liquid medium, thereby forming a one-way evaporative cooling cycle.

Description

Technical field

[0001] The invention relates to a heat dissipation device, in particular to a heat dissipation device for electric power equipment. Background Art

[0002] At present, the heat dissipation devices in some large-scale power equipment such as hydro-turbine generators and steam-turbine generators use the phase change heat transfer principle placed on the condenser. However, since the evaporative cooling medium floats when evaporating, self-circulation heat dissipation is difficult, and only fans or pumps can be used for forced heat exchange. The devices are large in size and difficult to layout, and cannot be promoted and used on most medium and small-sized power equipment.

[0003] In addition, when the condensation resources are lower than the heat source, it is difficult for power equipment to achieve self-circulating condensation heat exchange, and the condensation resources cannot be effectively utilized. For example, the bottom condensation resources of oil-immersed transformers, and the heat dissipation of power equipment at the seaside cannot utilize the huge condensation resources of the ocean. Summary of the Invention

[0004] In order to overcome the problems in the prior art that the top-mounted condenser cannot achieve self-circulating heat dissipation, is large in size, difficult to layout, cannot be promoted for use on most medium and small power equipment, and condensation resources cannot be effectively utilized, the present invention provides a method that utilizes the evaporation pressure under closed conditions as the self-circulating power after the condenser is placed downward, uses high insulation materials for the heat pipe to effectively prevent phase change and liquefaction in the heat conduction process, and achieves unidirectional circulation of the evaporated gas and liquid through the unidirectionality of the check valve, thereby realizing self-circulating evaporative cooling of the bottom-mounted condenser, and achieving flexible arrangement of the heat dissipation scheme of the power equipment and effective utilization of condensation resources.

[0005] The technical solution adopted by the present invention to solve its technical problem is actually: a self-circulating evaporative cooling device with a lower condenser, including a first evaporator, a heat conduction pipe, a first check valve, a condenser, a second evaporator, and a second check valve, which are connected in sequence to form a closed evaporative cooling system, a safety valve is installed at the upper end of the first evaporator, the first evaporator and the second evaporator are placed in a heat source, the first evaporator, the second evaporator and the condenser connected thereto are all filled with an appropriate amount of evaporable liquid medium, the condenser is placed at the lower end of the heat source and is connected to the lower port of the second evaporator, the lower side of the second evaporator is connected to the first evaporator through the second check valve, the evaporable liquid medium in the first evaporator is heated and evaporated to produce a gas-liquid mixed medium that enters the upper part and the heat conduction pipe, and the evaporable liquid medium in the second evaporator The liquid medium is heated and evaporated to produce a gas-liquid mixture medium which enters the upper closed space. The generated air pressure increase rate is greater than the air pressure increase rate in the first evaporator and the heat conduction pipe connected thereto. The second check valve opens to allow the gas-liquid mixture medium to enter the first evaporator. At the same time, the evaporable liquid medium in the lower part of the second evaporator is also ejected and flows into the first evaporator, and the evaporable liquid medium is replenished. At this time, the air pressure in the condenser is released, which is lower than the air pressure in the first evaporator and the heat conduction pipe connected thereto, causing the first check valve to open. The gas-liquid mixture medium in the heat conduction pipe enters the condenser, is cooled by absorbing heat, and then changes into an evaporable liquid medium, forming a one-way evaporative cooling cycle. The first evaporator, the second evaporator, and the condenser are made of high thermal conductivity materials, and the heat conduction pipe is made of high heat resistance materials.

[0006] In the above-mentioned condenser-bottomed self-circulating evaporative cooling device, the evaporable cooling medium contained in the first evaporator, the second evaporator and the condenser includes various types of fluorocarbon compounds.

[0007] The beneficial effects of the present invention are: a self-circulating heat dissipation device is provided for power equipment by adopting a self-circulating evaporative cooling method with a bottom-mounted condenser, which overcomes the defect that a top-mounted condenser cannot dissipate heat by self-circulation, and expands the scope of application. Its principle can be used in the heat dissipation device of power equipment at the seaside, and can also be made into a heat dissipation module and installed in the heating device of the power equipment, or placed inside the transformer oil tank, to achieve maximum improvement in heat transfer, heat conduction and heat dissipation efficiency, and is easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention will be further described below with reference to the accompanying drawings and examples.

[0009] Attachment Figure 1 Schematic diagram of the present invention

[0010] Attachment Figure 1 1. First evaporator, 2. Heat pipe, 3. First check valve, 4. Condenser, 5. Second evaporator, 6. Second check valve, 7. Safety valve, 8. Evaporable liquid medium, 9. Gas-liquid mixture medium, 10. Heat source. DETAILED DESCRIPTION

[0011] [Example 1]

[0012] The condenser-down self-circulating evaporative cooling device comprises a first evaporator 1, a heat pipe 2, a first non-return valve 3, a condenser 4, a second evaporator 5, a second non-return valve 6, and a safety valve 7, which are sequentially connected to form a closed evaporative cooling system. The safety valve 7 is installed on the top of the first evaporator 1, the upper port of the second evaporator is closed, the lower port is connected to the condenser 4, and the lower side is connected to the first evaporator 1 through the second non-return valve 6. The first evaporator 1 and the second evaporator 5 are placed in a heat source 10, and the condenser 4 is placed at the lower end of the heat source 10. The first evaporator 1, the second evaporator 5 and the condenser 4 connected thereto are all filled with an appropriate amount of evaporable liquid medium 8. The evaporable liquid medium 8 in the first evaporator 1 and the second evaporator 5 is heated and evaporated, and a gas-liquid mixture medium 9 is generated after the phase change, and enters the upper part of the first evaporator 1 and the heat pipe 2 connected thereto and the upper space inside the second evaporator 5 respectively. At this time, the upper part of the second evaporator 5 is closed due to the closed air. The gap is small, and the pressure increase rate of the gas-liquid mixture medium 9 during phase change is greater than the pressure increase rate in the first evaporator 1 and the heat pipe 2 connected thereto, causing the second check valve 6 to open, and the gas-liquid mixture medium 9 enters the first evaporator 1. At the same time, the evaporable liquid medium 8 in the lower part of the second evaporator 5 is also ejected and flows into the first evaporator 1, replenishing the evaporable liquid medium 8. At this time, the pressure in the condenser 4 is released and becomes lower than the pressure in the first evaporator 1 and the heat pipe 2 connected thereto, causing the first check valve 3 to open, and the gas-liquid mixture medium 9 in the first evaporator 1 and the heat pipe 2 enters the condenser 4, where it absorbs heat and cools before phase changing to the evaporable liquid medium 8, forming a one-way evaporative cooling cycle. The first evaporator 1, the second evaporator 5, and the condenser 4 are made of high thermal conductivity materials, and the heat pipe 2 is made of high thermal resistance materials.

[0013] [Example 2]

[0014] Taking the oil-immersed transformer as an example, the transformer body is placed in the middle layer of oil, and the oil temperature only circulates between the middle and upper layers. If a self-circulating evaporative cooling device with a bottom condenser is placed between the middle and bottom layers of the oil-immersed transformer, since the condenser is placed at the bottom, the evaporated gas-liquid mixture medium is introduced into the condenser at the bottom layer. The condenser is at the bottom layer of the transformer oil, which means that the oil temperature generated by the transformer heat is introduced into the bottom layer of the transformer oil, thereby promoting the convective heat transfer of the transformer oil and improving the heat dissipation efficiency. That is, the overload capacity is improved without changing the existing structure of the transformer and the maintenance-free requirements are met.

Claims

1. A condenser-down self-circulating evaporative cooling device, comprising a first evaporator (1), a heat conducting pipe (2), a first non-return valve (3), a condenser (4), a second evaporator (5), and a second non-return valve (6), which are sequentially connected to form a closed evaporative cooling system, a safety valve (7) is installed at the upper end of the first evaporator (1), the first evaporator (1) and the second evaporator (5) are placed in a heat source (10), and the first evaporator (1), the second evaporator (5) and the condenser (4) connected thereto are all filled with an appropriate amount of evaporable liquid medium (8), characterized in that: The condenser (4) is placed at the lower end of the heat source (10) and is connected to the lower end of the second evaporator (5). The lower side of the second evaporator is connected to the first evaporator (1) through the second check valve (6). At the same time, the evaporable liquid medium (8) in the first evaporator (1) is heated and evaporated to produce a gas-liquid mixed medium (9) which enters the upper part and the heat conduction pipe (2). The evaporable liquid medium (8) in the second evaporator (5) is heated and evaporated to produce a gas-liquid mixed medium (9) which enters the upper closed space. The generated gas pressure increase rate is greater than the gas pressure increase rate in the first evaporator (1) and the heat conduction pipe (2). The second check valve (6) is opened to allow the gas-liquid mixed medium (9) to enter the first evaporator ( 1), and at the same time, the evaporable liquid medium (8) in the lower part of the second evaporator (5) is also ejected and flows into the first evaporator (1), and the evaporable liquid medium (8) is replenished. At this time, the air pressure in the condenser (4) is released and is lower than the air pressure in the first evaporator (1) and the heat conducting pipe (2) connected thereto, so that the first check valve (3) is opened, and the gas-liquid mixture medium (9) in the heat conducting pipe (2) enters the condenser (4) and is absorbed and cooled, and then changes into the evaporable liquid medium (8), forming a one-way evaporative cooling cycle. The first evaporator (1), the second evaporator (5), and the condenser (4) are made of high thermal conductivity materials, and the heat conducting pipe (2) is made of high heat resistance materials.

2. The condenser-down self-circulating evaporative cooling device according to claim 1 is characterized in that: The vaporizable liquid medium (8) contained in the first evaporator (1), the second evaporator (5) and the condenser (4) contains various types of fluorocarbon compounds.

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