CN116123745A - Refrigerating system with low-pressure circulation barrel - Google Patents

Abstract

The invention discloses a refrigerating system with a low-pressure circulation barrel, which comprises the low-pressure circulation barrel, a compressor, oil, a condenser and an electronic expansion valve, wherein a first air return port of the low-pressure circulation barrel is communicated with an air suction port pipeline of the compressor, an air exhaust port of the compressor is communicated with an air inlet pipeline of the oil, a first air outlet of the oil is communicated with the air inlet pipeline of the condenser, a liquid outlet of the condenser is communicated with a liquid inlet pipeline of the electronic expansion valve, and the electronic expansion valve is communicated with the first liquid inlet pipeline of the low-pressure circulation barrel; the invention has two modes of mechanical circulation refrigeration and natural circulation refrigeration, meets the requirements for refrigeration conditions under the temperature environment of different seasons under the control of a control system, improves the efficiency of the refrigeration cycle of a machine room in the industries of a data center and the like, utilizes natural cold sources to the greatest extent, and obviously improves the energy-saving effect.

Description

A refrigeration system with a low-pressure circulation barrel

technical field

The invention relates to the technical field of refrigeration, in particular to a refrigeration system with a low-pressure circulation bucket.

Background technique

In an environment where constant temperature and humidity are required to be heated all year round, a precision air-conditioning refrigeration system is required to achieve this. When the precision air-conditioning unit is running, part of the lubricating oil will be discharged from the compressor together with the refrigerant and enter the system. Only when the lubricating oil discharged into the system passes through The separation measures can return to the compressor to maintain the balance of lubricating oil in the compressor, so as to ensure that the compressor is not short of oil, thereby avoiding damage to the compressor. If the oil level drops and the compressor is short of oil, the compressor will be damaged due to insufficient lubrication.

Contents of the invention

Aiming at the technical problems mentioned in the background art, the present invention provides a refrigeration system with a low-pressure circulation bucket.

The present invention adopts the following technical scheme: a refrigeration system with a low-pressure circulation barrel, including a low-pressure circulation barrel, a compressor, an oil separator, a condenser, and an electronic expansion valve, wherein the first air return port of the low-pressure circulation barrel is connected to the The air inlet pipeline of the compressor is connected, the exhaust port of the compressor is connected with the air inlet pipeline of the oil component, and the first gas outlet of the oil component is connected with the air inlet pipeline of the condenser, The liquid outlet of the condenser communicates with the liquid inlet pipeline of the electronic expansion valve, and the electronic expansion valve communicates with the first liquid inlet pipeline of the low-pressure circulation barrel to form a refrigeration cycle; it also includes a first An electric valve and a second electric valve, the first electric valve is connected in parallel with the compressor and the oil separator, the air inlet of the first electric valve is in communication with the first air return port of the low-pressure circulation barrel, so The air outlet of the first electric valve is connected with the air inlet pipeline of the condenser; the second electric valve is connected in parallel with the electronic expansion valve, and the liquid inlet of the second electric valve is connected with the condenser The liquid outlet pipeline of the second electric valve is connected with the first liquid inlet pipeline of the low-pressure circulation barrel; the oil return port of the oil component is connected with the first An oil return pipeline, the first oil return pipeline is connected with an oil return electromagnetic valve, which is used to return the lubricating oil separated from the oil to the compressor; the low pressure circulation barrel is provided with a high oil return point, The middle oil return point and the low oil return point, the high oil return point is connected to the first oil return branch, and the first oil return branch is connected with a high oil return cut-off valve and a high oil return solenoid valve; The middle oil return point is connected to the second oil return branch, and the middle oil return stop valve and the middle oil return solenoid valve are connected to the second oil return branch; the low oil return point is connected to the third oil return branch. A low oil return cut-off valve and a low oil return electromagnetic valve are connected to the third oil return branch; the first oil return branch, the second oil return branch and the second oil return branch are connected in parallel Collected in the second oil return pipeline, the second oil return pipeline is connected with the first oil return stop valve, the second oil return pipeline is connected with the first liquid inlet pipeline of the plate changer, and the first oil return line of the plate changer A gas outlet is connected with the gas return pipeline of the compressor; the second liquid inlet and the second liquid outlet of the plate changer are connected with the liquid outlet pipeline of the condenser.

Further, the low-pressure circulation barrel is also connected with multiple sets of evaporative heat exchange circulation systems, each set of evaporative heat exchange circulation systems includes a fluorine pump and an end evaporator, and the liquid inlet of the fluorine pump is connected to the bottom of the low-pressure circulation barrel. The end liquid outlet pipeline is connected, the liquid outlet of the fluorine pump is connected with the liquid inlet pipeline of the end evaporator, and the liquid outlet of the end evaporator is connected with the second liquid inlet pipe of the low-pressure circulation barrel. The road connects.

Further, the liquid outlet pipeline of each fluorine pump is connected with a third oil return pipeline, and the third oil return pipeline is connected with a second oil return cut-off valve, and the end of the third oil return pipeline is connected to the first oil return pipeline. The secondary oil return pipeline is connected.

Further, a liquid level gauge is arranged in the low-pressure circulation barrel to detect the change of the liquid level in the barrel.

Further, a spoiler is added to the liquid outlet of the low-pressure circulation barrel.

Further, there are multiple terminal evaporators connected in parallel with each other.

Further, there are one or more compressors, and one or more of scroll compressors, screw compressors or centrifugal compressors can be selected as the compressors.

Compared with the prior art, the present invention has the advantages that: the refrigeration system with low-pressure circulation barrel designed by the present invention has two operation modes of mechanical circulation refrigeration and natural circulation refrigeration, and operates under the control of the control system, which meets the needs of different seasons. The demand for cooling conditions in the temperature environment improves the efficiency of the refrigeration cycle of the computer room in the data center and other industries, and maximizes the use of natural cold sources, which significantly improves the energy saving effect. At the same time, this design innovatively designs the oil return system of the low-pressure circulation barrel, which not only ensures efficient oil return in the oil-rich layer, but also vaporizes the liquid refrigerant in the lubricating oil through plate replacement, which can effectively protect the compressor and prolong its service life. .

Description of drawings

Fig. 1 is the overall structure schematic diagram of the embodiment of the refrigerating system that has low-pressure circulating barrel of the present invention;

Fig. 2 is the working principle diagram when the present invention operates in the mechanical cycle refrigeration state;

Fig. 3 is the working principle diagram when the present invention operates in the natural circulation refrigeration state;

Among them: 1-low pressure circulation barrel, 2-compressor, 3-oil separator, 4-condenser, 5-electronic expansion valve, 6-first electric valve, 7-second electric valve, 8-first oil return pipeline, 9-oil return solenoid valve, 10-high oil return stop valve, 11-high oil return solenoid valve, 12-middle oil return stop valve, 13-middle oil return solenoid valve, 14-low oil return stop valve, 15-low oil return solenoid valve, 16-first oil return stop valve, 17-plate replacement, 18-fluorine pump, 19-end evaporator, 20-second oil return stop valve, 21-liquid level gauge, 22- The second oil return line, 23 the third oil return line.

Detailed ways

Hereinafter, in order to facilitate those skilled in the art to understand the technical solution of the present invention, further description will now be made with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention.

In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

Please refer to Fig. 1 , which is a schematic diagram of the overall structure of an embodiment of a refrigeration system with a low-pressure circulation barrel of the present invention, including a low-pressure circulation barrel 1, a compressor 2, an oil fraction 3, a condenser 4 and an electronic expansion valve 5, wherein the low-pressure circulation The first air return port of barrel 1 is connected with the air inlet pipeline of compressor 2, and the exhaust port of compressor 2 is connected with the air inlet pipeline of oil component 3. There can be one or more compressors 2, and the compressor 2 One or more of scroll compressor, screw compressor or centrifugal compressor can be selected. The first oil return pipeline 8 is connected between the oil return port of the oil component 3 and the compressor 2 , and the oil return solenoid valve 9 is connected on the first oil return pipeline for returning the lubricating oil separated from the oil component to the compressor 2 . In this embodiment, oil is added to the exhaust port of the compressor 2, and more than 95% of lubricating oil can be separated and returned to the compressor 2. The first gas outlet of the oil component 3 is communicated with the air inlet pipeline of the condenser 4, and the liquid outlet of the condenser 4 is communicated with the liquid inlet pipeline of the electronic expansion valve 5. Cold, water-cooled, evaporative-cooled. The electronic expansion valve 5 communicates with the first liquid inlet pipeline of the low-pressure circulation barrel 1 to form a refrigeration cycle;

This embodiment also includes a first electric valve 6 and a second electric valve 7. The first electric valve 6 is connected in parallel with the compressor 2 and the oil separator 3. The gas port pipeline is connected, the gas outlet of the first electric valve 6 is connected with the air inlet pipeline of the condenser 4; the second electric valve 7 is connected with the electronic expansion valve 5 in parallel, and the liquid inlet of the second electric valve 7 is connected with the condenser 4 The liquid outlet pipeline of the second electric valve 7 is connected with the first liquid inlet pipeline of the low-pressure circulation barrel 1;

In this embodiment, when the mechanical refrigeration mode is running, when the temperature in the environment is high, the compressor 2 is running, and the compressor 2 sucks the low-temperature and low-pressure gaseous refrigerant from the low-pressure circulation barrel into the compressor 2, and compresses it into a high-temperature and high-pressure gaseous state Refrigerant enters the oil component 3 to separate the lubricating oil, the lubricating oil enters the compressor 2 through the suction pipe of the compressor 2, the separated refrigerant transfers heat to the environment through the condenser 4, and the condensed liquid refrigerant passes through the electronic expansion valve 5 To lower the pressure and lower the temperature, send the low-temperature and low-pressure liquid refrigerant into the low-pressure circulation barrel 1 to form a reciprocating cold cycle.

When this embodiment is running in natural cooling mode, when the temperature in the environment is low, the compressor 2 stops working, and the gaseous refrigerant passes through the first electric valve 6 from the low-pressure circulation barrel 1, and transfers heat to the environment through the condenser 4, The condensed liquid refrigerant passes through the second electric valve 7, and the liquid refrigerant is sent into the low-pressure circulation barrel 1 to form a reciprocating cold cycle.

In this embodiment, a high oil return point, a middle oil return point and a low oil return point are also arranged in the low-pressure circulation barrel 1, and the high oil return point is connected to the first oil return branch, and the first oil return branch The road is connected with a high oil return cut-off valve 10 and a high oil return solenoid valve 11, the middle oil return point is connected with the second oil return branch, and the second oil return branch is connected with a middle oil return stop valve 12 and a middle oil return branch. Solenoid valve 13, the low oil return point is connected to the third oil return branch, the third oil return branch is connected with the low oil return cut-off valve 14 and the low oil return solenoid valve 15, the first oil return branch, the second oil return branch The branch circuit and the second oil return branch circuit are connected in parallel with each other and are collected in the second oil return pipeline 22. The first oil return stop valve 16 is connected to the second oil return pipeline 22. The second oil return pipeline 22 is connected to the first A liquid inlet pipeline connection, the first gas outlet of the plate changer 17 is connected to the gas return pipeline of the compressor 2; the second liquid inlet and the second liquid outlet of the plate changer 17 are connected to the liquid outlet of the condenser 4 Pipe connection.

In this embodiment, three oil return points are added to the low-pressure circulation barrel, and oil can be returned in the oil-rich layer of the liquid surface at different liquid levels, reducing the efficiency of the system as much as possible. At the same time, in the process of oil return, in order to avoid lubricating oil And the liquid refrigerant directly returns to the compressor 2 to cause the liquid hammer phenomenon. The plate changer 17 is added in the system, and the high-temperature refrigerant from the condenser 4 is used to vaporize the liquid refrigerant in the oil return mixture to protect the compressor 2.

The low-pressure circulation barrel 1 is also connected with multiple groups of evaporation heat exchange circulation systems, which can realize mutual backup and redundancy in the system, and improve the safety of the system. Each group of evaporative heat exchange circulation system includes a fluorine pump 18 and a terminal evaporator 19, the liquid inlet of the fluorine pump 18 is connected with the bottom liquid outlet of the low-pressure circulation barrel 1, and the liquid outlet of the fluorine pump 18 is connected with the terminal evaporator The liquid inlet pipeline of 19 is connected, and the liquid outlet of terminal evaporator 19 is connected with the second liquid inlet pipeline of low-pressure circulation barrel 1, thus forms a new type of barrel pump between low-pressure circulation barrel 1 and fluorine pump 19. combined cycle mode.

In this embodiment, the evaporative heat exchange cycle system is used to transfer the low-temperature and low-pressure liquid refrigerant to each terminal evaporator in a multi-connected form through the fluorine pump 18, and the terminal evaporator 19 is a back plate, top-mounted heat exchange Terminal, return air cooler, inter-column heat exchanger, wind mast, unit machine or chip cold plate type. During specific implementation, there are multiple terminal evaporators 19 and they are connected in parallel with each other. The terminal evaporator 19 absorbs the heat in the room, and the liquid refrigerant is vaporized, or partially vaporized, and then returns to the low-pressure circulation barrel 1. The refrigerant delivered by the fluorine pump 18 can be a single cycle or a multiple cycle. The installation conditions of the system are convenient, the evaporator is lower than the unit, the fluorine pump can be eliminated in this system, and only gravity is used for liquid supply.

In addition, in this embodiment, the outlet pipeline of each fluorine pump 18 is connected with a third oil return pipeline 23, and the third oil return pipeline 23 is connected with a second oil return stop valve 20, and the third oil return pipeline The end of 23 communicates with the second oil return pipeline 22.

A liquid level gauge 21 is installed in the low-pressure circulation barrel 1, which is used to detect the change of the liquid level in the barrel in real time, and to control the opening and closing of the solenoid valves at the oil return points at different heights, so as to achieve precise oil return.

A spoiler is added to the liquid outlet of the low-pressure circulation barrel 1, which is not shown in the figure. The spoiler can prevent the fluorine pump from forming a vortex on the liquid surface when the fluorine pump absorbs liquid, and bringing in the gaseous refrigerant, which will cause the fluorine pump to cavitate, cause abnormal noise and vibration of the fluorine pump, and cause the fluorine pump to fail and the system to fail.

To sum up, the refrigeration system with low-pressure circulation barrel designed by the present invention has two operation modes of mechanical circulation refrigeration and natural circulation refrigeration, and operates under the control of the control system, which meets the requirements of refrigeration conditions in different seasons of temperature environments. The demand has improved the efficiency of the refrigeration cycle of the computer room in the data center and other industries, and the maximum use of natural cold sources has greatly improved the energy saving effect. At the same time, this design innovatively designs the oil return system of the low-pressure circulation barrel, which not only ensures efficient oil return in the oil-rich layer, but also vaporizes the liquid refrigerant in the lubricating oil through plate replacement, which can effectively protect the compressor and prolong its service life. .

This invention is applicable to multiple scenarios such as data centers, IDC computer rooms, and energy storage. Its main purpose is twofold. One is how to effectively protect the compressor with the lubricating oil added in the refrigeration system. This invention is based on the oil return of the compressor and proposes Add separation oil return during the compressor exhaust process, add oil return devices with different liquid levels in the low-pressure circulation barrel, and add oil return devices in the multi-terminal evaporator system to ensure the safe operation of the compressor; the second is to use the barrel pump The circulation principle miniaturizes each circulation system and realizes mutual backup between multiple groups of evaporators to increase system redundancy and improve safety. The system of the present invention consists of a compression refrigeration cycle system and a plurality of evaporation heat exchange cycle systems. The low-pressure cycle tank 1 is a bridge between the two systems. In this part, both the heat transfer function and the liquid storage function are realized.

The above embodiments are only descriptions of the preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various modifications and changes to the technical solutions of the present invention. Improvements should all fall within the scope of protection determined by the claims of the present invention.

Claims (7)

1. A refrigeration system with a low-pressure circulation barrel, characterized in that it comprises a low-pressure circulation barrel (1), a compressor (2), an oil fraction (3), a condenser (4) and an electronic expansion valve (5), wherein , the first air return port of the low-pressure circulation barrel (1) is in communication with the suction port of the compressor (2), and the exhaust port of the compressor (2) is connected with the air inlet of the oil component (3) The pipeline is connected, the first gas outlet of the oil component (3) is connected with the air inlet pipeline of the condenser (4), and the liquid outlet of the condenser (4) is connected with the electronic expansion valve (5 ) is communicated with the liquid inlet pipeline, and the electronic expansion valve (5) is communicated with the first liquid inlet pipeline of the low-pressure circulation barrel (1) to form a refrigeration cycle; It also includes a first electric valve (6) and a second electric valve (7), the first electric valve (6) is connected in parallel with the compressor (2) and the oil separator (3), and the first electric valve ( 6) the air inlet is connected with the first air return pipe of the low-pressure circulation barrel (1), and the air outlet of the first electric valve (6) is connected with the air inlet pipe of the condenser (4) communication; the second electric valve (7) is connected in parallel with the electronic expansion valve (5), and the liquid inlet of the second electric valve (7) is connected with the liquid outlet pipeline of the condenser (4) , the liquid outlet of the second electric valve (7) is in communication with the first liquid inlet pipeline of the low-pressure circulation barrel (1); A first oil return line (8) is connected between the oil return port of the oil component (3) and the compressor (2), and an oil return solenoid valve (9) is connected to the first oil return line for transferring the oil component The lubricating oil separated in is returned in the described compressor (2); The low-pressure circulation barrel (1) is provided with a high oil return point, a middle oil return point and a low oil return point, the high oil return point is connected to the first oil return branch, and the first oil return A high oil return cut-off valve (10) and a high oil return solenoid valve (11) are connected to the branch; the middle oil return point is connected to the second oil return branch, and the second oil return branch is connected to the middle oil return branch. Oil cut-off valve (12) and middle oil return solenoid valve (13); the low oil return point is connected to the third oil return branch, and the third oil return branch is connected with a low oil return stop valve (14) and the low oil return solenoid valve (15); the first oil return branch, the second oil return branch and the second oil return branch are connected in parallel with each other and are collected in the second oil return line (22), and the second A first oil return cut-off valve (16) is connected to the oil return line (22), the second oil return line (22) is connected to the first liquid inlet line of the plate changer (17), and the plate changer ( The first gas outlet of 17) is connected with the suction port pipeline of the compressor (2); the second liquid inlet and the second liquid outlet of the plate changer (17) are connected with the condenser (4) The liquid outlet pipeline is connected. 2. The refrigerating system with a low-pressure circulation bucket according to claim 1, characterized in that, the low-pressure circulation bucket (1) is also connected with multiple sets of evaporative heat exchange cycle systems, and each group of the evaporative heat exchange cycle systems Comprising a fluorine pump (18) and a terminal evaporator (19), the liquid inlet of the fluorine pump (18) is in communication with the bottom liquid outlet of the low-pressure circulation barrel (1), and the fluorine pump (18) The liquid outlet is communicated with the liquid inlet pipeline of the terminal evaporator (19), and the liquid outlet of the terminal evaporator (19) is communicated with the second liquid inlet pipeline of the low-pressure circulation barrel (1). 3. The refrigerating system with the low-pressure circulation bucket according to claim 2, characterized in that, the liquid outlet pipeline of each said fluorine pump (18) is connected with a third oil return pipeline (23), said A second oil return cut-off valve (20) is connected to the third oil return pipeline (23), and the end of the third oil return pipeline (23) communicates with the second oil return pipeline (22). 4. The refrigerating system with a low-pressure circulation bucket according to claim 3, characterized in that a liquid level gauge (21) is arranged in the low-pressure circulation bucket (1) for detecting changes in the liquid level in the bucket. 5. The refrigeration system with a low-pressure circulation barrel according to claim 4, characterized in that a spoiler is added to the liquid outlet of the low-pressure circulation barrel (1). 6. The refrigerating system with a low-pressure circulating bucket according to claim 5, characterized in that there are multiple terminal evaporators (19) connected in parallel with each other. 7. The refrigerating system with a low-pressure circulating drum according to claim 6, characterized in that, there are one or more compressors (2), and the compressor (2) can be selected from scroll compressors, screw compressors One or more of compressors or centrifugal compressors.

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