Parallel unit adopting low-pressure flash evaporation liquid storage device

Abstract

The utility model discloses a parallel unit adopting a low-pressure flash evaporation liquid storage device, and belongs to the technical field related to compression refrigeration. The system comprises an oil cooler, an oil separator connected with the oil cooler, a first compressor, a second compressor, a first gas-liquid separator connected with the first compressor, a second gas-liquid separator connected with the second compressor, a low-pressure flash evaporation liquid storage device, and a condenser simultaneously connected with the oil cooler and the low-pressure flash evaporation liquid storage device, an air outlet pipe of the low-pressure flash evaporation liquid storage device is connected with the first compressor and the second compressor at the same time, a liquid outlet pipe of the low-pressure flash evaporation liquid storage device is connected with the liquid supply device, a liquid inlet pipe of the low-pressure flash evaporation liquid storage device is connected with the condenser, the low-pressure flash evaporation liquid storage device is creatively adopted in the refrigerating system, and the dual purposes of liquid storage and liquid supercooling can be achieved; an economizer and corresponding pipelines are completely omitted, and gas in low-pressure liquid storage can be directly supplemented into the compressor to reduce the exhaust temperature of the compressor.

Description

Technical Field

[0001] The utility model relates to the technical field related to compression refrigeration, and in particular to a parallel unit adopting a low-pressure flash evaporation liquid storage device. Background Art

[0002] In the compression refrigeration cycle system, the compressor inhales low-temperature and low-pressure refrigerant vapor from the evaporator, which is adiabatically compressed by the compressor to become high-temperature and high-pressure superheated steam, and then pressed into the condenser for constant pressure cooling, releasing heat to the cooling medium, and then cooled to supercooled liquid refrigerant. The liquid refrigerant is adiabatically throttled by the expansion valve (or capillary tube) to become a low-pressure liquid refrigerant, which evaporates in the evaporator and absorbs heat from the air-conditioning circulating water (air), thereby cooling the air-conditioning circulating water (air) to achieve the purpose of refrigeration, and the outflowing low-pressure refrigerant is sucked into the compressor, and the cycle works in this way.

[0003] In order to stabilize the system, reduce the exhaust temperature of the compressor, improve the compression ratio, and avoid the problem that the compressor ratio is too large and cannot work normally under low temperature conditions, some auxiliary machines will be added to cooperate with the operation of the system. For example, the use of the economizer makes the single-stage compressor become a quasi-two-stage compressor, which increases the subcooling of the refrigerant and improves the cooling capacity of the evaporator.

[0004] The economizer is a heat exchanger that absorbs heat through the throttling of the refrigerant itself and evaporation, thereby supercooling another part of the refrigerant. In the refrigeration system, the liquid condensed by the condenser is divided into two paths. One path absorbs part of the heat and evaporates into gas and returns to the compressor. The other path of refrigerant is supercooled and enters the evaporator to evaporate, and then returns to the compressor.

[0005] When multiple compressors need to be used in parallel in the system, the number of economizers required will increase accordingly. Each economizer needs to be equipped with solenoid valves, thermal expansion valves, filters and other components. With the increase of control components and valves, the potential failure points of the overall equipment increase, the reliability of the equipment decreases, and regular inspection and maintenance are required. When multiple economizers are used in equipment, the total cost of economizers and piping components accounts for a large proportion, and they occupy a certain amount of installation space and piping on the unit, making the unit larger in size.

[0006] If the above-mentioned economizer can be eliminated from the unit through technological innovation, while at the same time achieving the purpose of liquid subcooling and compressor air replenishment, it will be of great significance from the perspective of economy and reliability. Utility Model Content

[0007] The utility model provides a parallel unit adopting a low-pressure flash evaporation liquid storage device, aiming to solve the above technical defects.

[0008] The specific technical solutions provided by the utility model are as follows:

[0009] The utility model provides a parallel unit using a low-pressure flash liquid reservoir, comprising an oil cooler, an oil separator connected to the oil cooler, a first compressor and a second compressor, a first gas-liquid separator connected to the first compressor, a second gas-liquid separator connected to the second compressor, a low-pressure flash liquid reservoir connected to both the first compressor and the second compressor, and a condenser connected to both the oil cooler and the low-pressure flash liquid reservoir, wherein an air outlet pipe of the low-pressure flash liquid reservoir is connected to both the first compressor and the second compressor, a liquid outlet pipe of the low-pressure flash liquid reservoir is connected to a liquid supply device, and a liquid inlet pipe of the low-pressure flash liquid reservoir is connected to the condenser.

[0010] Optionally, the low-pressure flash liquid storage device includes a shell, an air outlet pipe, a liquid outlet pipe and a liquid inlet pipe fixed on the shell, and a gas phase rectifying orifice plate and a liquid phase rectifying orifice plate located inside the shell, wherein the air outlet pipe, the liquid outlet pipe and the liquid inlet pipe are all connected to the inner cavity of the shell.

[0011] Optionally, the lower end of the liquid inlet pipe is located in an accommodating space formed by the gas phase rectifying orifice plate and the shell.

[0012] Optionally, both the first compressor and the second compressor are connected to the oil separator and the oil cooler, and the oil separator is connected to the condenser.

[0013] The utility model has the following beneficial technical effects:

[0014] The embodiment of the utility model provides a parallel unit using a low-pressure flash liquid reservoir, including an oil cooler, an oil separator connected to the oil cooler, a first compressor and a second compressor, a first gas-liquid separator connected to the first compressor, a second gas-liquid separator connected to the second compressor, a low-pressure flash liquid reservoir connected to both the first compressor and the second compressor, and a condenser connected to both the oil cooler and the low-pressure flash liquid reservoir, wherein an air outlet pipe of the low-pressure flash liquid reservoir is connected to both the first compressor and the second compressor, a liquid outlet pipe of the low-pressure flash liquid reservoir is connected to a liquid supply device, and a liquid inlet pipe of the low-pressure flash liquid reservoir is connected to the condenser. The low-pressure flash liquid reservoir is pioneered in the refrigeration system, and the dual purposes of liquid storage and liquid supercooling can be met, while the economizer and corresponding pipelines are completely eliminated, and the gas in the low-pressure liquid storage can be directly added to the compressor to cool down the compressor exhaust temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the structure of a parallel unit using a low-pressure flash liquid storage device according to an embodiment of the utility model;

[0017] Figure 2 The present invention is a schematic structural diagram of a low-pressure flash liquid storage device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] The following will be combined Figure 1 and Figure 2 A parallel unit using a low-pressure flash liquid storage device according to an embodiment of the utility model is described in detail.

[0020] refer to Figure 1 As shown, a parallel unit using a low-pressure flash liquid reservoir provided by an embodiment of the utility model includes an oil cooler 1, an oil separator 2 connected to the oil cooler 1, a first compressor 3 and a second compressor 4, a first gas-liquid separator 5 connected to the first compressor 3, a second gas-liquid separator 6 connected to the second compressor 4, a low-pressure flash liquid reservoir 7 connected to the first compressor 3 and the second compressor 4 at the same time, and a condenser 8 connected to the oil cooler 1 and the low-pressure flash liquid reservoir 7 at the same time, wherein an air outlet pipe 71 of the low-pressure flash liquid reservoir 7 is connected to the first compressor 3 and the second compressor 4 at the same time, a liquid outlet pipe 72 of the low-pressure flash liquid reservoir 7 is connected to a liquid supply device 9, and a liquid inlet pipe 73 of the low-pressure flash liquid reservoir 7 is connected to the condenser 8.

[0021] refer to Figure 1 and Figure 2As shown, the embodiment of the present invention improves the structure of the low-pressure flash evaporation liquid storage device 7, wherein the low-pressure flash evaporation liquid storage device 7 after structural improvement includes a shell 74, an air outlet pipe 71 fixed on the shell 74, a liquid outlet pipe 72 and a liquid inlet pipe 73, and a gas phase rectifying orifice plate 75 and a liquid phase rectifying orifice plate 76 located inside the shell 74, wherein the air outlet pipe 71, the liquid outlet pipe 72 and the liquid inlet pipe 73 are all connected to the inner cavity of the shell 74. The lower end of the liquid inlet pipe 73 is located in the accommodating space 77 formed by the gas phase rectifying orifice plate 75 and the shell 74. The first compressor 3 and the second compressor 4 are both connected to the oil separator 2 and the oil cooler 1, and the oil separator 2 is connected to the condenser 8.

[0022] refer to Figure 1 As shown, the return gas enters the first compressor 3 and the second compressor 4 respectively after passing through the first gas-liquid separator 5 and the second gas-liquid separator 6, enters the oil separator 2 after being compressed, enters the condenser 8 after being processed by the oil separator 2, enters the interior of the low-pressure flash liquid storage 7 after absorbing or releasing heat in the condenser 8, and then realizes the refrigeration cycle after being processed by the compressor. The innovative use of the low-pressure flash liquid storage in the refrigeration system can completely eliminate the economizer and corresponding pipelines in the prior art by meeting the dual purposes of liquid storage and liquid supercooling.

[0023] The embodiment of the utility model provides a parallel unit using a low-pressure flash liquid reservoir, including an oil cooler, an oil separator connected to the oil cooler, a first compressor and a second compressor, a first gas-liquid separator connected to the first compressor, a second gas-liquid separator connected to the second compressor, a low-pressure flash liquid reservoir connected to both the first compressor and the second compressor, and a condenser connected to both the oil cooler and the low-pressure flash liquid reservoir, wherein the gas outlet pipe of the low-pressure flash liquid reservoir is connected to both the first compressor and the second compressor, the liquid outlet pipe of the low-pressure flash liquid reservoir is connected to a liquid supply device, and the liquid inlet pipe of the low-pressure flash liquid reservoir is connected to the condenser. The low-pressure flash liquid reservoir is pioneeringly used in a refrigeration system, which can completely eliminate the economizer and corresponding pipelines by meeting the dual purposes of liquid storage and liquid supercooling, and the gas in the low-pressure liquid storage can be directly added to the compressor to cool down the compressor exhaust temperature, thereby reducing the installation of pipelines, valves, and electronic components related to the economizer in the system, thereby reducing the corresponding failure points and improving the working reliability of the system.

[0024] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A parallel unit using a low-pressure flash liquid storage device, characterized in that: The parallel unit includes an oil cooler, an oil separator connected to the oil cooler, a first compressor and a second compressor, a first gas-liquid separator connected to the first compressor, a second gas-liquid separator connected to the second compressor, a low-pressure flash liquid reservoir connected to both the first compressor and the second compressor, and a condenser connected to both the oil cooler and the low-pressure flash liquid reservoir, wherein an air outlet pipe of the low-pressure flash liquid reservoir is connected to both the first compressor and the second compressor, a liquid outlet pipe of the low-pressure flash liquid reservoir is connected to a liquid supply device, and a liquid inlet pipe of the low-pressure flash liquid reservoir is connected to the condenser.

2. The parallel unit according to claim 1, characterized in that: The low-pressure flash liquid storage device comprises a shell, an air outlet pipe, a liquid outlet pipe and a liquid inlet pipe fixed on the shell, and a gas phase rectifying orifice plate and a liquid phase rectifying orifice plate located inside the shell, wherein the air outlet pipe, the liquid outlet pipe and the liquid inlet pipe are all connected to the inner cavity of the shell.

3. The parallel unit according to claim 2, characterized in that: The lower end of the liquid inlet pipe is located in the accommodating space formed by the gas phase rectifying orifice plate and the shell.

4. The parallel unit according to claim 2, characterized in that: The first compressor and the second compressor are both connected to the oil separator and the oil cooler, and the oil separator is connected to the condenser.

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