A large height difference and pressure difference liquid supply refrigeration system

Abstract

This utility model provides a large differential pressure liquid supply refrigeration system, relating to the field of refrigeration system technology. It includes a compressor, the compressor's exhaust port connected to the condenser's inlet, the condenser's liquid outlet connected to the high-pressure liquid receiver's inlet, the high-pressure liquid receiver's liquid outlet connected to the gas-liquid separator's inlet, the gas-liquid separator's liquid outlet connected to the expansion valve's inlet, and the expansion valve's liquid outlet connected to the evaporator's inlet. A gas collecting device is installed at the highest point of the vertical pipe connecting the gas-liquid separator and the expansion valve. The system adds a regenerative gas-liquid separator, increasing the subcooling of the liquid supply line; this subcooling of the high-pressure liquid lowers the temperature of the liquid refrigerant before throttling, reduces flash gas, and improves the refrigeration effect. Simultaneously, increasing the superheat of the refrigerant gas returning from the evaporator ensures that the refrigerant entering the compressor is entirely gaseous, preventing liquid refrigerant from entering the compressor and causing liquid slugging damage.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration system technology, and in particular to a large height difference and pressure difference liquid supply refrigeration system. Background Technology

[0002] In refrigeration systems, the choice of refrigerant supply method directly affects the system's efficiency, stability, and applicability. Currently, projects commonly feature refrigeration rooms on the ground floor or underground, while the terminal evaporators are located at higher elevations, with a height difference exceeding 20 meters between the refrigeration room and the evaporators. The refrigerant supply methods include differential pressure direct expansion refrigerant supply, which supplies refrigerant directly to the evaporator via an expansion valve, allowing the refrigerant to completely vaporize in the evaporator; and circulating pump refrigerant supply (forced refrigerant supply), which forces the refrigerant from a low-pressure circulating tank to the evaporator via a pump, with excess liquid returning to the circulating tank. Differential pressure direct expansion refrigerant supply has significant advantages in terms of simple structure and low cost.

[0003] However, in high-pressure differential refrigerant supply systems, due to the high density of Freon liquid, the static pressure of the liquid column increases significantly with height. As the liquid pipe height increases, the static pressure may cause some liquid refrigerant to flash into gas before reaching the expansion valve due to pressure reduction (especially at higher ambient temperatures). This two-phase flow reduces the flow control accuracy of the expansion valve, affecting the system's refrigeration efficiency and failing to meet the high-pressure differential refrigerant supply requirements of actual projects. This invention aims to solve the high-pressure differential refrigerant supply problem in high-pressure differential direct expansion systems. Utility Model Content

[0004] This invention provides a liquid supply refrigeration system with a large height difference and pressure difference, ensuring that the liquid supply pipeline contains only liquid refrigerant before entering the throttling device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A high-pressure differential liquid supply refrigeration system includes a compressor, the compressor's exhaust port being connected to the condenser's inlet, the condenser's liquid outlet being connected to the high-pressure liquid receiver's inlet, the high-pressure liquid receiver's liquid outlet being connected to the gas-liquid separator's inlet, the gas-liquid separator's liquid outlet being connected to the expansion valve's inlet, and the expansion valve's liquid outlet being connected to the evaporator's inlet. A gas collecting device is installed at the highest point of the vertical pipe connecting the gas-liquid separator and the expansion valve.

[0006] Furthermore, the inlet of the gas-liquid separator is connected to the outlet of the evaporator.

[0007] Furthermore, the air inlet of the compressor is connected to the air outlet of the gas-liquid separator.

[0008] Furthermore, multiple evaporators and expansion valves are provided, and the liquid inlet of the expansion valve is connected to the main pipeline through multiple secondary pipelines. The main pipeline is connected to the liquid outlet of the gas-liquid separator.

[0009] Furthermore, the gas collection device is installed at the highest point of the main pipeline.

[0010] Furthermore, the gas-liquid separator is a regenerative gas-liquid separator.

[0011] The beneficial effects of this utility model are as follows: The system incorporates a regenerative gas-liquid separator to increase the subcooling of the liquid supply line, thereby subcooling the high-pressure liquid. This lowers the temperature of the liquid refrigerant before throttling, reduces flash gas emissions, and increases cooling capacity. Simultaneously, increasing the superheat of the refrigerant gas returning from the evaporator ensures that all refrigerant entering the compressor is gaseous, preventing liquid refrigerant from entering the compressor and causing liquid slugging damage.

[0012] The refrigerant is fed through a gas-collecting device at the highest point of the liquid supply pipeline after passing through the regenerative gas separator, and is placed in a low-temperature environment to ensure that only liquid refrigerant remains in the liquid supply pipeline before entering the throttling device. Attached Figure Description

[0013] To more clearly illustrate the embodiments of this utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the system structure of this utility model.

[0015] Explanation of icon numbers: 1. Compressor; 2. Condenser; 3. High-pressure liquid receiver; 4. Gas-liquid separator; 5. Expansion valve; 6. Gas collection device; 7. Evaporator; 8. Main pipeline; 9. Subsequent pipeline. Detailed Implementation

[0016] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] This utility model provides a technical solution: a liquid supply refrigeration system with a large height difference and pressure difference, such as... Figure 1 As shown, it includes a compressor 1, a condenser 2, a high-pressure liquid receiver 3, a regenerative gas-liquid separator 4, an expansion valve 5, a gas collection device 6, and an evaporator 7.

[0020] The air inlet of compressor 1 is connected to the air outlet of the regenerative gas-liquid separator, and the air outlet of compressor 1 is connected to the condenser. The air inlet of condenser 2 is connected to the exhaust port of compressor 1, and the liquid outlet of condenser 2 is connected to the liquid inlet of high-pressure liquid receiver 3. The inlet of the high-pressure liquid receiver 3 is connected to the outlet of the condenser 2, and the outlet of the high-pressure liquid receiver 3 is connected to the inlet of the regenerative gas-liquid separator 4. The inlet of the regenerative gas-liquid separator 4 is connected to the outlet of the high-pressure liquid receiver 3, the outlet of the regenerative gas-liquid separator 4 is connected to the inlet of the expansion valve 5, the inlet of the regenerative gas-liquid separator 4 is connected to the outlet of the evaporator 7, and the outlet of the regenerative gas-liquid separator 4 is connected to the inlet of the compressor 1. The inlet of expansion valve 5 is connected to the outlet of regenerative gas-liquid separator 4, and the outlet of expansion valve 5 is connected to the inlet of evaporator 7. The gas collection device 6 is installed at the highest point of the riser of the liquid supply pipeline between the liquid outlet of the regenerative gas-liquid separator 4 and the inlet of the expansion valve 5. The inlet of evaporator 7 is connected to the outlet of expansion valve 5, and the outlet of evaporator 7 is connected to the inlet of regenerative gas-liquid separator 4.

[0021] Working principle: Low-temperature, low-pressure Freon gas is drawn into and compressed by compressor 1, becoming high-temperature, high-pressure gas. This high-temperature, high-pressure gas enters condenser 2, where it condenses into high-pressure liquid refrigerant through heat release. The high-pressure liquid refrigerant then enters high-pressure receiver 3. During changes in refrigeration load (such as start-up, shutdown, or fluctuations in operating conditions), a continuous supply of liquid refrigerant is provided to prevent insufficient or interrupted liquid supply from expansion valve 5. The high-temperature, high-pressure liquid passes through gas-liquid separator 4, where it exchanges heat with the return gas from evaporator 7, reducing the supply liquid temperature to 10-15K subcooling. After cooling, the refrigerant liquid, supplied at a large elevation difference, experiences flash gas due to the static pressure caused by the elevation difference, which condenses into refrigerant liquid in gas collection device 6. Gas collection device 6 can be installed separately at the highest point of the system's liquid supply riser, or an additional riser length can be added to replace the gas collection device. The gas collection device must be placed in a low-temperature environment and is not insulated. The static pressure generated by the large elevation difference in the liquid supply pipeline causes some of the liquid refrigerant to flash and condense into liquid refrigerant, which is then supplied to the terminal expansion valve 5. The cooled liquid refrigerant passes through the expansion valve 5 for throttling and pressure reduction, becoming a low-temperature, low-pressure gas-liquid two-phase mixture. The gas-liquid two-phase mixture directly enters the evaporator 7, absorbs heat, and evaporates completely into gas. The gas passes through the gas-liquid separator 4 to exchange heat with the liquid refrigerant, causing the return gas to be heated and then returning to the compressor 1 to complete the refrigeration cycle.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A large differential pressure differential supply liquid refrigeration system, characterized by, The system includes a compressor (1), the exhaust port of which is connected to the air inlet of a condenser (2), the liquid outlet of which is connected to the liquid inlet of a high-pressure liquid receiver (3), the liquid outlet of which is connected to the liquid inlet of a gas-liquid separator (4), the liquid outlet of which is connected to the liquid inlet of an expansion valve (5), and the liquid outlet of which is connected to the liquid inlet of an evaporator (7). A gas collecting device (6) is provided at the highest point of the vertical pipe connecting the gas-liquid separator (4) and the expansion valve (5).

2. The large differential pressure differential expansion refrigeration system of claim 1, wherein, The inlet of the gas-liquid separator (4) is connected to the outlet of the evaporator (7).

3. The large differential pressure differential expansion refrigeration system of claim 1, wherein, The air inlet of the compressor (1) is connected to the air outlet of the gas-liquid separator (4).

4. The large differential pressure differential expansion refrigeration system of claim 1, wherein, Multiple evaporators (7) and multiple expansion valves (5) are provided. The liquid inlet of the expansion valve (5) is connected to the main pipe (8) through multiple secondary pipes (9). The main pipe (8) is connected to the liquid outlet of the gas-liquid separator (4).

5. The large differential pressure differential expansion refrigeration system of claim 1, wherein, The gas collection device (6) is installed at the highest point of the main pipeline (8).

6. The large differential pressure differential expansion refrigeration system of claim 1, wherein, The gas-liquid separator (4) is a regenerative gas-liquid separator (4).

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