CN212573361U

CN212573361U - Gravity liquid supply backflow type phase change heat transfer system with cold source

Info

Publication number: CN212573361U
Application number: CN202021332653.7U
Authority: CN
Inventors: 孙继东; 何慧丽
Original assignee: Beijing Zhongre Information Technology Co ltd
Current assignee: Beijing Zhongre Information Technology Co ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2021-02-19
Anticipated expiration: 2030-07-09

Abstract

A gravity liquid supply reflux type phase change heat transfer system with a cold source comprises a condenser, a flash tank, a plurality of groups of evaporators, throttling valves A, circulating pumps, a compressor, a throttling valve B, a gas collecting pipe and a liquid supply pipe, wherein the throttling valves A, the circulating pumps, the compressor, the throttling valves B, the gas collecting pipe and the liquid supply pipe are in one-to-one correspondence with the evaporators; the liquid refrigerant outlet of the flash tank is communicated with a liquid supply pipe; a refrigerant inlet of each evaporator is communicated with outlets of the throttling valves A which correspond to the evaporators one by one through pipelines, and inlets of the throttling valves A are communicated with the liquid supply pipe through pipelines; the refrigerant outlet of each evaporator is communicated with the gas collecting pipe; a refrigerant inlet of the circulating pump is communicated with the gas collecting pipe, and a refrigerant outlet of the circulating pump is communicated with the liquid supply pipe; the refrigerant inlet end of the compressor is respectively communicated with the gas collecting pipe and the outlet of the gaseous refrigerant of the flash tank; a refrigerant outlet end of the compressor is communicated with a refrigerant inlet of the condenser; and the throttle valve B is arranged between the condenser and the flash tank.

Description

Gravity liquid supply backflow type phase change heat transfer system with cold source

Technical Field

The application relates to the technical field of data center refrigeration, in particular to a gravity liquid supply backflow type phase change heat transfer system with a cold source.

Background

Along with the development of a data center, the heat is larger, the existing machine room air conditioning system adopts a heat management mode for controlling the overall temperature of a machine room, the heat exchange temperature difference is relatively small, and the heat exchange efficiency is low.

The heat dissipation methods adopted in the existing information machine room mainly include the following methods:

one is the accurate air supply of precision air conditioner, and the server rack has directly been introduced to the cold wind that this mode computer lab indoor adoption wind channel will precision air conditioner, and main advantage has realized that cold wind directly introduces the server rack, makes under the rack server air inlet is in more ideal low temperature state, and the shortcoming is that the fan need choose for use the big pressure head fan that can overcome the wind channel resistance, and consequently the fan consumption is great, has brought the precision air conditioner consumption great thereupon.

The other is a row-to-row air conditioner, which directly sends cold air of an air conditioning system to a cabinet needing cooling through a specific air duct, increases the cold air sending temperature difference, and can properly improve the air supply temperature of air conditioning cooling so as to improve the overall performance of the air conditioning system. The main disadvantage of this method is that the blower of the air conditioning system is required to provide a large pressure head, which increases the transport energy consumption of the air supply, and in addition, the air distribution in the air duct is also not easily adjustable.

Thirdly, the back plate air conditioner arranges the evaporator of the air conditioning system at the air outlet of the cabinet, thus effectively reducing the cold energy dissipation of the air conditioning system and supplying cold as required; however, introducing water into the machine room presents a safety hazard.

In addition to the three heat removal modes, the gravity-driven heat pipe heat removal product is more and more widely applied in the field of machine room heat removal due to the advantages of high efficiency, energy conservation, safety, reliability and the like. However, when the gravity heat pipe is used, the high-power heat dissipation cannot be safely and stably achieved, so that the refrigeration cooling system which can utilize an outdoor natural cold source, can improve the overall performance and reliability of a unit and can ensure the normal and stable operation of a data center or communication machine room equipment all the year round is designed, and the problem to be solved in the field is urgently solved.

Disclosure of Invention

An object of the utility model is to overcome the problem that above-mentioned prior art exists, and provide a gravity from taking the cold source supplies liquid backward flow formula phase change heat transfer system, can utilize nature cold source and mechanical refrigeration's combination to realize the high-power heat transfer of unit completely, and realize the accurate confession liquid of every evaporimeter through the choke valve, the gas collecting pipe that has opened the bringing again after shutting down in having solved high-power phase change heat transfer system through the design of circulating pump is full of liquid refrigerant, unable normal operating's problem.

In order to achieve the above purpose, the technical scheme of the utility model is that:

a gravity liquid supply reflux type phase change heat transfer system with a cold source comprises a condenser, a flash tank, a plurality of groups of evaporators, throttling valves A, circulating pumps, a compressor, a throttling valve B, a gas collecting pipe and a liquid supply pipe, wherein the throttling valves A, the circulating pumps, the compressor, the throttling valves B, the gas collecting pipe and the liquid supply pipe are in one-to-one correspondence with the evaporators; the liquid refrigerant outlet of the flash tank is communicated with a liquid supply pipe; a refrigerant inlet of each evaporator is communicated with outlets of the throttling valves A which correspond to the evaporators one by one through pipelines, and inlets of the throttling valves A are communicated with the liquid supply pipe through pipelines; the refrigerant outlet of each evaporator is communicated with the gas collecting pipe through a pipeline; a refrigerant inlet of the circulating pump is communicated with the gas collecting pipe through a pipeline, and a refrigerant outlet of the circulating pump is communicated with the liquid supply pipe through a pipeline; the refrigerant inlet end of the compressor is communicated with the gas collecting pipe, and the refrigerant inlet end of the compressor is also communicated with the outlet of the gaseous refrigerant of the flash tank; a refrigerant outlet end of the compressor is communicated with a refrigerant inlet of the condenser; one end of the throttle valve B is communicated with a refrigerant outlet of the condenser, and the other end of the throttle valve B is communicated with an inlet of the flash tank.

Further, still include first check valve, first check valve is connected between circulating pump and the feed pipe.

Further, a second one-way valve is included and is mounted between the outlet of the gaseous refrigerant of the flash tank and the compressor.

Furthermore, the position of the flash tank is higher than that of the evaporators, so that the refrigerant in the flash tank flows back to the evaporators through the liquid supply pipe by gravity.

Further, the circulating pump is a fluorine pump or a two-phase flow pump.

Compared with the prior art, the utility model has the advantages of it is following:

the utility model discloses a gravity liquid supply backward flow formula phase transition heat transfer system from taking cold source adopts one to drag many through the design of flash tank and choke valve A, and the high-power heat dissipation of single gravity heat pipe can be realized to the refrigerant in the system pipeline relying on gravity drive completely, and every evaporimeter can all accurately supply liquid, is in best operating condition; in addition, the whole system works more stably due to the design of the circulating pump, and the problem that the system cannot transfer heat due to phase change because the gas collecting pipe is filled with liquid refrigerant when the system is stopped suddenly and restarted is solved; the whole system is safe and reliable; the system backup selection is flexible, and the method is suitable for data rooms with different redundancy backup requirements.

Drawings

Fig. 1 is a schematic structural diagram of the gravity liquid supply reflux phase change heat transfer system with a cold source of the present invention.

In the figure: 1. a condenser; 2. a flash tank; 3. an evaporator; 4. A throttle valve A; 5. a circulation pump; 61. a first check valve; 62. a second one-way valve; 7. a liquid supply tube; 8. A gas collecting pipe; 9. a compressor; 10. and a throttle valve B.

Detailed Description

The present invention is further illustrated by the following examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that modifications and equivalents can be made to the technical solutions described in the foregoing examples or to some of the technical features thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Referring to fig. 1, the gravity liquid supply reflux phase change heat transfer system with a cold source of the present invention includes a condenser 1, a flash tank 2, a plurality of evaporators 3, a throttle valve a4 corresponding to the evaporators one by one, a circulating pump 5, a compressor 9, a throttle valve B10, a liquid supply pipe 7 and a gas collecting pipe 8;

the liquid refrigerant outlet of the flash tank 2 is communicated with a liquid supply pipe 7; the refrigerant liquid supply port of each evaporator 3 is communicated with the outlet of the throttling valve A4 corresponding to the evaporator one by one through a pipeline, and the inlet of the throttling valve A4 is communicated with the liquid supply pipe 7 through a pipeline; the refrigerant outlet port of each evaporator 3 is communicated with the gas collecting pipe 8 through a pipeline; a refrigerant inlet of the circulating pump 5 is communicated with the gas collecting pipe 8 through a pipeline, and a refrigerant outlet of the circulating pump 5 is communicated with the liquid supply pipe 7 through a pipeline; the refrigerant inlet end of the compressor 9 is communicated with the gas collecting pipe 7, and the refrigerant inlet end of the compressor 9 is also communicated with the gaseous refrigerant outlet of the flash tank 2; a refrigerant outlet end of the compressor 8 is communicated with a refrigerant inlet of the condenser 1; one end of the throttle valve B10 is communicated with the refrigerant outlet of the condenser 1, and the other end of the throttle valve 10B is communicated with the inlet of the flash tank 2.

Further, a first check valve 61 is included, and the first check valve 61 is connected between the circulation pump 5 and the liquid supply pipe 7.

Further, a second check valve 62 is included, the second check valve 62 being installed between the outlet of the gaseous refrigerant of the flash tank 2 and the compressor 9.

The position of the flash tank 2 is higher than that of the evaporators 3, so that the refrigerant in the flash tank 2 flows back to the evaporators 3 through the liquid supply pipe 7 under the action of gravity.

The throttle valve a4 is an electronic throttle valve, and it detects the temperature of the corresponding evaporator 3 to accurately supply liquid, so that the evaporator 3 is in the optimum working state.

The circulating pump 5 is a fluorine pump or a two-phase flow pump, a large amount of liquid refrigerant exists in a liquid collecting pipe 8 of the whole system, and when the whole system cannot work normally, the circulating pump 5 is started to pump the liquid refrigerant or the gas-liquid mixed refrigerant stored in the gas collecting pipe 8 back to the flash tank 2.

The working principle and the working process of the gravity liquid supply reflux type phase change heat transfer system with the cold source are as follows:

when the system works normally for heat exchange, the circulating pump 5 is closed, the liquid supply pipe 7 is vertically arranged below the flash tank 2 and is communicated with the lower part of the flash tank 2, cold refrigerant flows into each evaporator 3 from the flash tank 2 through the liquid supply pipe 7 and the throttle valve A4 under the action of gravity, and the throttle valve A4 adjusts the amount of the refrigerant in the evaporator 3 by detecting the temperature of the corresponding evaporator 3, so that the evaporator 3 is in an optimal working state; the evaporator 3 exchanges heat with indoor high-temperature environment, refrigerant in the evaporator 3 is gasified, then gaseous refrigerant enters the compressor 9 through the gas collecting pipe 8, meanwhile, gaseous refrigerant in the flash tank 2 also enters the compressor 9 through the second one-way valve 62, high-temperature high-pressure refrigerant discharged from the compressor 9 enters the condenser 1 to exchange heat with the external environment, the gaseous refrigerant after heat release is condensed into liquid refrigerant or a gas-liquid mixed state, and the refrigerant cooled in the condenser 1 enters the flash tank 2 through the throttle valve B10 to be subjected to gas-liquid separation; then, the gaseous refrigerant in the flash tank 2 enters the compressor 9 through the second check valve 62, and the liquid refrigerant in the flash tank 2 flows into each evaporator 3 through the liquid supply pipe 7 and each throttle valve a4 under the action of gravity, so that the reciprocating circulation is realized, the heat exchange is completed, and the heat dissipation of the heat source is realized.

When the gravity liquid supply reflux type phase change heat transfer system with the cold source runs or is just started, a large amount of liquid refrigerant exists in the liquid collecting pipe 8, when the whole system cannot work normally, the circulating pump 5 is started, the liquid refrigerant or the gas-liquid mixed refrigerant stored in the gas collecting pipe 8 is pumped back to the flash tank 2 until the liquid refrigerant in the gas collecting pipe 8 is pumped out, the circulating pump 5 stops working, and at the moment, the gravity liquid supply reflux type phase change heat transfer system with the cold source recovers a normal heat exchange mode.

The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. The utility model provides a gravity supplies liquid backward flow formula phase transition heat transfer system from taking cold source which characterized in that: the system comprises a condenser, a flash tank, a circulating pump, a compressor, a throttle valve B, a gas collecting pipe, a liquid supply pipe, a plurality of groups of evaporators and throttle valves A which are in one-to-one correspondence with the evaporators; the liquid refrigerant outlet of the flash tank is communicated with a liquid supply pipe; a refrigerant inlet of each evaporator is communicated with outlets of the throttling valves A which are in one-to-one correspondence with the evaporators through pipelines, and inlets of the throttling valves A which are in one-to-one correspondence with the evaporators are respectively communicated with the liquid supply pipe through pipelines; the refrigerant outlet of each evaporator is communicated with the gas collecting pipe through a pipeline; a refrigerant inlet of the circulating pump is communicated with the gas collecting pipe through a pipeline, and a refrigerant outlet of the circulating pump is communicated with the liquid supply pipe through a pipeline; the refrigerant inlet end of the compressor is communicated with the gas collecting pipe, and the refrigerant inlet end of the compressor is also communicated with the outlet of the gaseous refrigerant of the flash tank; a refrigerant outlet end of the compressor is communicated with a refrigerant inlet of the condenser; one end of the throttle valve B is communicated with a refrigerant outlet of the condenser, and the other end of the throttle valve B is communicated with an inlet of the flash tank.

2. The gravity liquid supply reflux type phase change heat transfer system with the cold source as claimed in claim 1, wherein: further comprises a first one-way valve connected between the circulating pump and the liquid supply pipe.

3. The gravity liquid supply reflux type phase change heat transfer system with the cold source as claimed in claim 1, wherein: further included is a second one-way valve mounted between the outlet of the flash tank for gaseous refrigerant and the compressor.

4. The gravity liquid supply reflux type phase change heat transfer system with the cold source as claimed in claim 1, wherein: the position of the flash tank is higher than that of the evaporators, so that the refrigeration working medium in the flash tank flows back to each evaporator through the liquid supply pipe by means of gravity.

5. The gravity liquid supply reflux type phase change heat transfer system with the cold source as claimed in claim 1, wherein: the circulating pump is a fluorine pump or a two-phase flow pump.