Flash evaporator for a heat pump air conditioning system

Abstract

The application discloses a flash evaporator of a heat pump air conditioning system, which comprises a flash evaporator body, a gas supplement pipe and an upper inlet and outlet liquid pipe arranged at the top of the flash evaporator body, a liquid supplement pipe and a lower inlet and outlet liquid pipe arranged at the bottom of the flash evaporator body, a baffle arranged at the middle of the flash evaporator body, a through hole arranged on the baffle, and the upper inlet and outlet liquid pipe extending downwards from the top of the flash evaporator body to below the baffle. The gas supplement pipe is used for supplementing gas into the compression chamber of the compressor, and the liquid supplement pipe is used for supplementing liquid into the compressor to reduce the temperature, so that the exhaust temperature of the compressor can be prevented from being too high.

Description

Technical Field

[0001] This invention relates to a flash evaporator for a heat pump air conditioning system. Background Technology

[0002] The working principle of a flash evaporator is to use gas-liquid separation. The gas in the upper part of the flash evaporator enters the medium-pressure chamber of the compressor directly through an electronic expansion valve or a solenoid valve, thereby increasing the mass flow rate of the compressor and improving the heating capacity at low temperatures.

[0003] For heat pump air conditioning systems using enthalpy-increasing compressors with gas injection, if R32 refrigerant is used, since the discharge temperature of R32 refrigerant is more than 10°C higher than that of R410a, when it is necessary to activate the enthalpy-increasing compressor to increase heating capacity, it will cause the compressor discharge temperature to over-temperature protection, or the compressor frequency can only be reduced, sacrificing performance. Summary of the Invention

[0004] To address the above problems, the present invention provides a flash evaporator for a heat pump air conditioning system, which effectively solves the problems pointed out in the background art.

[0005] The technical solution adopted in this invention is:

[0006] A flash evaporator for a heat pump air conditioning system includes a flash evaporator body. The top of the flash evaporator body is provided with a gas supply pipe and an upper liquid inlet / outlet pipe, and the bottom is provided with a liquid supply pipe and a lower liquid inlet / outlet pipe. A baffle is provided in the middle of the flash evaporator body, and a through hole is provided on the baffle. The upper liquid inlet / outlet pipe extends downward from the top of the flash evaporator body to below the baffle.

[0007] Preferably, the baffle has multiple through holes, and the through holes are evenly distributed on the baffle.

[0008] Multiple evenly distributed through holes allow gaseous refrigerant to enter the area above the baffle in a uniform and rapid manner.

[0009] Preferably, the distance between the bottom end of the upper inlet / outlet pipe and the inner wall of the bottom of the flash evaporator body is 10 mm.

[0010] Preferably, the gas supply pipe, liquid supply pipe, and lower inlet / outlet liquid pipe all extend 10 mm into the flash evaporator body.

[0011] Preferably, the gas supply pipe, upper liquid inlet / outlet pipe, liquid supply pipe, lower liquid inlet / outlet pipe, and baffle are all fixed to the flash evaporator body by welding.

[0012] This invention supplies gas to the compressor's intermediate pressure chamber via a gas supply pipe, and simultaneously supplies liquid to the compressor via a liquid supply pipe to cool it down, thus preventing the compressor's exhaust temperature from exceeding the over-temperature protection limit.

[0013] This invention prevents the liquid level at the bottom of the flash evaporator from rising to the position of the gas supply pipe by setting a baffle inside the flash evaporator body, with the edge of the baffle welded to the inside of the flash evaporator body. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of the outdoor unit connected to the present invention. Detailed Implementation

[0016] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0017] 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 this application. 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.

[0018] Furthermore, in the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0023] like Figure 1 As shown, a flash evaporator for a heat pump air conditioning system includes a flash evaporator body 1. The top of the flash evaporator body 1 is provided with a gas supply pipe 2 and an upper liquid inlet / outlet pipe 3, and the bottom is provided with a liquid supply pipe 4 and a lower liquid inlet / outlet pipe 5. The gas supply pipe 2, the upper liquid inlet / outlet pipe 3, the liquid supply pipe 4, the lower liquid inlet / outlet pipe 5, and a baffle 6 are all fixed to the flash evaporator body 1 by welding. The distance between the bottom end of the upper liquid inlet / outlet pipe 3 and the inner wall of the bottom of the flash evaporator body 1 is 10mm. The gas supply pipe 2, the liquid supply pipe 4, and the lower liquid inlet / outlet pipe 5 all extend into the flash evaporator body 1 by 10mm. A baffle 6 is provided in the middle of the flash evaporator body 1. The baffle 6 has through holes. The upper liquid inlet / outlet pipe 3 extends downward from the top of the flash evaporator body 1 to below the baffle 6. The baffle 6 has multiple through holes, and the through holes are evenly distributed on the baffle 6.

[0024] In cooling mode:

[0025] The liquid or gas-liquid two-phase refrigerant condensed in the outdoor heat exchanger enters the flash evaporator body 1 through the upper inlet / outlet pipe 3. Due to the difference in specific gravity between gas and liquid, the gas enters the upper part of the flash evaporator body 1 through the through hole on the baffle 6. The gas in the upper part of the flash evaporator body 1 is sent to the medium-pressure chamber of the compressor through the gas replenishment pipe 2 for gas replenishment. The liquid is stored at the bottom of the flash evaporator body 1. Some of the liquid is sent to the liquid replenishment port of the compressor through the liquid replenishment pipe 4 for liquid replenishment and cooling of the compressor. Most of the liquid at the bottom enters the indoor unit for cooling through the lower inlet / outlet pipe 5.

[0026] In heating mode:

[0027] The liquid or gas-liquid two-phase refrigerant condensed in the indoor unit enters the flash evaporator body 1 through the lower inlet / outlet pipe 5. Due to the difference in specific gravity between gas and liquid, the gas enters the upper part of the flash evaporator body 1 through the through hole on the baffle 6. The gas in the upper part of the flash evaporator body 1 is sent to the medium-pressure chamber of the compressor through the gas replenishment pipe 2 for gas replenishment. The liquid is stored at the bottom of the flash evaporator body 1. Some of the liquid is sent to the compressor's liquid replenishment port through the liquid replenishment pipe 4 for replenishing the compressor and cooling it. Most of the liquid at the bottom enters the outdoor heat exchanger through the upper inlet / outlet pipe 3 to absorb heat and then returns to the compressor.

[0028] This invention solves the problem of excessively high compressor discharge temperature while using R32 refrigerant and activating gas injection enthalpy enhancement, without affecting the system's gas injection usage. This not only improves heating performance but also enhances compressor reliability.

[0029] Figure 2 The diagram shows the structure of the outdoor unit of this invention. The gas supply pipe 2 is connected to the medium pressure port of the compressor and is equipped with a solenoid valve or an electronic expansion valve. The liquid supply pipe 4 is connected to the liquid supply port of the compressor and is equipped with an electronic expansion valve. The flow rate from the liquid supply pipe 4 to the compressor can be adjusted by controlling the opening degree of the electronic expansion valve.

[0030] Finally, it should be noted that the above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this invention should be considered within the scope of protection of this invention.

Claims

1. A flash evaporator for a heat pump air conditioning system, characterized in that, The system includes a flash evaporator body (1), with a gas supply pipe (2) and an upper liquid inlet / outlet pipe (3) at the top and a liquid supply pipe (4) and a lower liquid inlet / outlet pipe (5) at the bottom. A baffle (6) is provided in the middle of the flash evaporator body (1), and a through hole is provided on the baffle (6). The upper liquid inlet / outlet pipe (3) extends downward from the top of the flash evaporator body (1) to below the baffle (6). The gas supply pipe (2) is used to supply gas to the intermediate pressure chamber of the compressor, and the liquid supply pipe (4) is used to supply liquid to the compressor for cooling. The two work together to prevent the exhaust temperature from exceeding the limit when the R32 refrigerant system starts gas supply to increase enthalpy.

2. The flash evaporator of a heat pump air conditioning system according to claim 1, characterized in that, The baffle (6) has multiple through holes, and the through holes are evenly distributed on the baffle (6).

3. The flash evaporator of a heat pump air conditioning system according to claim 1, characterized in that, The distance between the bottom end of the upper inlet / outlet pipe (3) and the bottom inner wall of the flash evaporator body (1) is 10 mm.

4. The flash evaporator of a heat pump air conditioning system according to claim 1, characterized in that, The gas supply pipe (2), liquid supply pipe (4) and lower inlet / outlet liquid pipe (5) all extend 10 mm into the flash evaporator body (1).

5. The flash evaporator of a heat pump air conditioning system according to claim 1, characterized in that, The gas supply pipe (2), upper liquid inlet / outlet pipe (3), liquid supply pipe (4), lower liquid inlet / outlet pipe (5) and baffle (6) are all fixed to the flash evaporator body (1) by welding.

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