Gas-liquid separation integrator with heat regeneration function

Abstract

The invention discloses a gas-liquid separation integrator with a heat regeneration function. The gas-liquid separation integrator is composed of a closed container, the interior of the closed container is divided into a separation chamber and a backheating chamber which are independent from each other through a partition plate, a round hole is formed in the upper portion of the partition plate, and refrigerant gas in the separation chamber flows to the backheating chamber through the round hole after being subjected to gas-liquid separation; a packing cup containing packing is arranged on the upper portion in the separation chamber, a refrigerant low-pressure air inlet pipe penetrates through the top wall of the separation chamber to enter the packing, a heat return pipe is arranged in the heat return chamber, the top of the heat return pipe penetrates through the top of the heat return chamber to enter, the tail of the heat return pipe penetrates out of the bottom face of the heat return chamber, and the heat return pipe is formed by twisting two or three round pipes into a fried dough twist shape. The separation chamber and the regenerative chamber are separated, so that the structure and the manufacturing process of the regenerative separator are simplified, the assembly precision of parts can be improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of refrigeration and air conditioning, and more specifically to a gas-liquid separation integrator with a heat recovery function. Background Art

[0002] The gas-liquid separator in the refrigeration and air-conditioning system has two functions. One is to adjust and store the excess liquid refrigerant in the system when the environmental conditions change and the refrigerant flow rate changes. The other is to separate the droplets in the evaporated refrigerant to protect the compressor. The regenerator (also called intermediate heat exchanger, internal heat exchanger, economizer) exchanges heat between the high-pressure cooled refrigerant and the low-pressure evaporated refrigerant. Related research shows that due to the system characteristics of refrigeration and air-conditioning equipment and the special properties of certain refrigerants, the use of a regenerator in the circulation system can improve the operating efficiency of the system. At the same time, since the refrigerant on the low-pressure side is further heated, the droplets mixed in the compressor intake air can be improved, reducing the damage to the compressor caused by liquid hammer.

[0003] The gas-liquid separator and regenerator in traditional refrigeration and air-conditioning equipment are two independent components. The gas-liquid separator often uses a U-tube or a J-tube. The regenerator generally uses a shell-and-tube heat exchanger (or coaxial tube). For new energy vehicles, the air-conditioning system involves the hot and cold temperature management of the passenger compartment, battery, motor and electronic control system, which is called a thermal management system. Its development characteristics are different from those of traditional refrigeration and air-conditioning systems, and it needs to highlight compactness, economy, lightness and high efficiency. Therefore, modular development of components has become a trend, such as the integration of gas-liquid separators and regenerators, which has become the main development form.

[0004] In automobile air conditioners using traditional refrigerants (such as R134a and R1234yf), high-pressure liquid storage tanks are generally used to store and regulate refrigerants, and thermal expansion valves are used to control the refrigerant state at the evaporator outlet to protect the compressor. For heat pump air conditioning systems or automobile thermal management systems using CO2 refrigerants, since CO2 is a transcritical fluid during the high-pressure heat release process, it is neither a liquid nor a gas, so it is impossible to set up a high-pressure liquid storage tank. In addition, the operating conditions of the automobile air conditioning system are complex and changeable, and the changes in the refrigerant circulation flow can be adjusted through a storage-type gas-liquid separator. In addition, the CO2 heat pump system uses an electronic expansion valve to throttle and control the flow, so a regenerator is required to improve system efficiency and protect the compressor.

[0005] Figure 1 As a typical representative of the gas-liquid separator with heat recovery, references [1]-[8] all describe patents related to the gas-liquid separator with heat recovery. Figure 2The schematic diagram of the refrigeration system cycle is shown in the figure: compressor 11, gas cooler 12, gas-liquid separator with heat recovery 13, evaporator 14; the low-pressure refrigerant at the outlet of the evaporator enters from LP IN, passes through the channel and enters the bulk liquid cup. After gas-liquid separation in the bulk liquid cup, the liquid flows out from the bottom of the bulk liquid cup and accumulates at the bottom of the bulk liquid cup. The gas flows out from the middle outlet on the upper part of the bulk liquid cup, passes through the spiral tube arranged between the bulk liquid cup and the inner cylinder, exchanges heat with the high-pressure liquid inside the spiral tube, and further absorbs heat before flowing out from LPOUT and entering the compressor. The high-pressure liquid flows out of the gas cooler and enters the spiral tube from HPOUT / IN of the gas-liquid separator with heat recovery. After further cooling with the low-pressure gas, it flows out from HPIN / OUT and enters the throttle valve. The heat exchange between the high-pressure liquid in the spiral tube and the low-pressure gas after gas-liquid separation is called heat recovery. The patent of reference [7] is a refrigeration and air-conditioning system specifically for CO2 refrigerant.

[0006] References [9]-

[14] mainly describe several patents after the modification of the spiral tube structure and form. Figure 1 The invention comprises: an upper joint 21, an outer cylinder 22, a spiral tube 23, a spiral tube 24, a gas filter 25, a lower joint 26, a bulk liquid cup 27, an intake manifold 28, a desiccant 19, and an intake pipe 20. Figure 1 The spiral tube in the is a round tube, which is wound around the bulk cup, and Figure 3 It is a structure that replaces the regenerator spiral tube, which is also wound on the bulk cup. Among them, the regenerator structure uses various forms of microchannel flat tubes plus fins, such as microchannel flat round tubes plus external fins; microchannel flat square tubes plus internal fins; different spacing between flat tubes in the same channel, etc. The purpose is to improve the heat exchange effect of the regenerator.

[0007] References:

[0008] [1]Stephan.Accumulator for Combined Component with Internal HeatExchanger Especially for Refrigerant Loops with R744 as Working Fluid[P].US2009 / 0044563A1.2009-2-19.

[0009] [2]Roman Heckt.Refrigerant Accumulator for Motor Vehicle AirConditioning Units[P].US2009 / 0044563A1.2009-2-19.

[0010] [3] Yiri et al. Accumulator optionally combined with an internal heat exchanger in a shared housing [P]. CN112513545A.2021-3-16.

[0011] [4] Stefan et al. Device for storing refrigerant in a refrigerant circulation loop and method for operating the device [P]. CN110857825A.2020-3-3.

[0012] [5] Yili Zapulet. Cyclone for separating gas-liquid mixture and refrigerant accumulator including the cyclone [P]. CN109425157A.2019-3-5.

[0013] [6] Luo Weixin, Wang Chuanhua, et al. Gas-liquid separator and heat exchange equipment [P]. CN209197226U, 2019-08-02. [7] Cheng Xianyao, Chen Guangtai, Pang Xuebo, et al. Integrated heat recovery gas-liquid separator and refrigeration system for carbon dioxide refrigerant air conditioning [P]. CN210425379U, 2020-04-28.

[0014] [8] Wang Jiangtao, Feng Ye, Chen Yang, et al. A new type of heat recovery gas-liquid separator for refrigeration system [P]. CN218764104U, 2023-03-28.

[0015] [9] Dong Junqi, Li Li, Wang Mei. Gas-liquid separator and thermal management system [P]. CN112432400A, 2021-03-02.

[0016]

[10] Li Li, Dong Junqi, Wang Mei. Gas-liquid separator[P]. CN112432401A, 2021-03-02.

[0017]

[11] Dong Junqi, Li Li, Wang Mei. Gas-liquid separator and thermal management system [P]. CN112432402A, 2021-03-02.

[0018]

[12] Dong Junqi, Dong Haifeng. Gas-liquid separation device[P]. CN112432403A, 2021-03-02.

[0019]

[13] Dong Junqi, Wang Mei, Li Li, et al. Gas-liquid separator and thermal management system [P]. CN112444013A, 2021-03-05.

[0020]

[14] Dong Haifeng, Li Li, Dong Junqi, et al. Gas-liquid separator and thermal management system [P]. CN112460864A, 2021-03-09.

[0021] The above prior art has the following disadvantages:

[0022] Figure 1Disadvantages of medium cyclone heat recovery separator:

[0023] The problem of assembly accuracy between the spiral tube and the bulk liquid cup increases the manufacturing cost.

[0024] The spiral tube pipeline for the flow of refrigerant liquid is a single-pass coil, the pipeline flow loss is large, and the pipe diameter size belongs to the conventional pipe diameter, so the heat exchange effect is poor.

[0025] Large pressure drop and heat exchange difference may lead to insufficient heat exchange and liquid hammer.

[0026] Figure 3 Disadvantages of medium flat tube heat recovery separator:

[0027] The manufacturing process of microchannel flat tubes with internal and external fins is complex, with low precision and high cost.

[0028] After the microchannel flat tube is bent, the tube wall on one side becomes thinner, the high pressure resistance is weakened, the safety is reduced, and the deformed flat tube is prone to refrigerant leakage, which is difficult to detect.

[0029] The gas refrigerant side that exchanges heat with the liquid refrigerant has a narrow flow area and a large pressure drop.

[0030] Excessively increasing the heat recovery capacity, especially after adding inner ribs to the microchannel flat tube, will cause a large pressure loss on the liquid refrigerant side, reduce the heat exchange effect, and increase the manufacturing cost of the components.

[0031] Uneven liquid distribution in microchannel flat tubes can easily lead to uneven refrigerant flow distribution, affecting the stability of the refrigerant flow. Summary of the invention

[0032] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a gas-liquid separation integrator with a heat recovery function.

[0033] The present invention discloses a gas-liquid separation integrator with a heat recovery function, which is realized by the following technical scheme: the gas-liquid separation integrator is composed of a closed container, in which a partition is used to separate a separation chamber and a heat recovery chamber which are independent of each other; the separation chamber is used for gas-liquid separation, and the heat recovery chamber is used for heat recovery; a circular hole is provided on the upper part of the partition, and the refrigerant gas in the separation chamber flows to the heat recovery chamber from the circular hole after gas-liquid separation; a stuffing cup with a stuffing is provided on the upper part of the separation chamber, a low-pressure refrigerant inlet pipe passes through the top wall of the separation chamber into the stuffing, and the vaporized refrigerant enters the heat recovery chamber through the circular hole on the partition; a heat recovery pipe is provided in the heat recovery chamber, the top of the heat recovery pipe enters through the top of the heat recovery chamber, and the tail of the heat recovery pipe passes through the bottom of the heat recovery chamber and exits; the heat recovery pipe is formed by two / three circular pipes twisted into a twist shape.

[0034] The filler is an XH7 molecular sieve desiccant.

[0035] The heat recovery pipe includes 2-pass, 4-pass, etc., with no limit on the number of passes.

[0036] The refrigerant low-pressure inlet pipe is in a tangential direction.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] Figure 4 The heat recovery separator in the invention separates the separation chamber and the heat recovery chamber, which simplifies the structure and manufacturing process of the heat recovery separator, improves the assembly accuracy of the components, and reduces the manufacturing cost.

[0039] In the same heat exchange space, two / three-pass twisted heat exchange tubes are used. The tube diameter is smaller than that of single-pass heat exchange tubes and larger than that of microchannel heat exchange tubes. After optimizing the tube diameter, the pipeline flow loss on the liquid refrigerant side can be reduced and the refrigerant flow rate on the liquid side can be increased. The twisted pipeline can increase the flow disturbance on the refrigerant side while improving the heat exchange efficiency and avoiding liquid hammer.

[0040] The two-pass / three-pass small-diameter heat exchange circular tube has enhanced high-pressure resistance compared to the single-pass circular tube, and can reduce the risk of leakage compared to the microchannel tube, thus improving the safety factor of system operation.

[0041] Compared with indoor space Figure 1 Large, thus reducing the pressure drop in the gas refrigerant side flow area.

[0042] 5. Compared with microchannel tubes, two / three-pass heat exchange circular tubes reduce the unstable refrigerant flow and poor heat exchange effect caused by uneven liquid separation on the refrigerant liquid side. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a gas-liquid separator with heat recovery;

[0044] Figure 2 It is a schematic diagram of the refrigeration system cycle;

[0045] Figure 3 It is a flat tube type heat recovery separator;

[0046] Figure 4 It is a structural schematic diagram of the present invention;

[0047] Figure 5 It is a schematic diagram of the structure of the replacement scheme of the present invention. DETAILED DESCRIPTION

[0048] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0049] The present invention provides a gas-liquid separation integrated device with heat recovery function, such as Figure 4 As shown, the gas-liquid separation manifold is composed of a closed container, in which a partition 1 is used to separate a separation chamber and a reheat chamber which are independent of each other. The separation chamber is used for gas-liquid separation, and the reheat chamber is used for reheating. A circular hole 2 is arranged on the upper part of the partition, and the refrigerant gas in the separation chamber flows to the reheat chamber through the circular hole after gas-liquid separation; a packing cup 3 with a packing is arranged on the upper part of the separation chamber, and a low-pressure refrigerant inlet pipe 4 passes through the top wall of the separation chamber and enters the packing. The vaporized refrigerant enters the reheat chamber through the circular hole on the partition, and a reheat pipe 5 is arranged in the reheat chamber. The top of the reheat pipe enters through the top of the reheat chamber, and the tail of the reheat pipe passes through the bottom of the reheat chamber and exits. The reheat pipe is twisted into a twist shape by two / three circular pipes. The packing generally uses XH7 molecular sieve desiccant.

[0050] Combination Figure 4 The working principle is briefly described as follows:

[0051] Figure 4 It is divided into two chambers, the separation chamber and the reheat chamber, i.e. the large chamber and the small chamber. The large chamber is for gas-liquid separation, and the small chamber is for reheat. The two chambers are independent of each other and separated by a partition in the middle. There is a round hole on the upper layer of the partition. The large chamber is mainly composed of packing and packing cups that play a separation role. The refrigerant gas in the large chamber enters from the inlet and passes through the packing for gas-liquid separation. The liquid settles to the bottom due to gravity, and the gas flows to the small chamber from the round hole. The small chamber is composed of reheat pipes. The gas flowing from the large chamber passes through the reheat pipes and exchanges heat with the high-temperature and high-pressure liquid in the pipes, thereby increasing the temperature and reaching a certain degree of superheat. The reheat pipe is made of two / three round pipes twisted into a twist shape and placed in the middle of the small chamber. The filler generally uses XH7 molecular sieve desiccant.

[0052] Figure 5 Yes Figure 4A U-shaped tube 6 is arranged in the large chamber to utilize centrifugal force separation instead of packing separation. An oil hole 7 is opened at the bottom of the U-shaped tube. The separated gas refrigerant enters the U-shaped tube inlet. The U-shaped tube outlet is connected to the circular hole of the partition. The gas refrigerant and the atomized oil enter the small chamber through the outlet and the circular hole, and enter the compressor after heat exchange with the heat recovery heat exchange tube. In this way, the beneficial effect of "the small-diameter heat exchange circular tube of the two / three-pass process has enhanced its high-pressure resistance compared with the single-pass circular tube, can reduce the risk of leakage compared with the microchannel tube, and improves the safety factor of the system operation" can be achieved.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A gas-liquid separation integrated device with heat recovery function, characterized in that: The gas-liquid separation integrator is composed of a closed container, in which a separation chamber and a reheat chamber are separated by a partition and are independent of each other. The separation chamber is used for gas-liquid separation, and the reheat chamber is used for reheating. A circular hole is arranged on the upper part of the partition, and the refrigerant gas in the separation chamber flows to the reheat chamber through the circular hole after gas-liquid separation; a filling cup with a filler is arranged on the upper part of the separation chamber, and the refrigerant low-pressure air inlet pipe passes through the top wall of the separation chamber and enters the filler, and the vaporized refrigerant enters the reheat chamber through the circular hole on the partition, and a reheat pipe is arranged in the reheat chamber, and the top of the heat pipe enters through the top of the reheat chamber, and the tail of the heat pipe passes through the bottom of the reheat chamber and exits, and the heat pipe is formed by two / three circular pipes twisted into a twist shape.

2. The gas-liquid separation integrated device with heat recovery function according to claim 1 is characterized in that: The filler is an XH7 molecular sieve desiccant.

3. The gas-liquid separation integrated device with heat recovery function according to claim 1 is characterized in that: The refrigerant low-pressure inlet pipe is in a tangential direction.

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