A high-temperature and low-temperature heat pump air conditioning system

Abstract

A high- and low-temperature heat pump air conditioning system includes a heat-increasing compressor, a four-way valve, a compound heat exchanger, a fan, an economizer, a water-side heat exchanger, a gas-liquid separator, a gas-liquid heat exchanger, a first throttle valve, a second throttle valve, a third throttle valve, and an electric shut-off valve. The compound heat exchanger includes a main heat exchanger and an auxiliary heat exchanger, which are arranged in a front-to-rear manner. The fan draws air from the main heat exchanger, with air flowing from back to front. The main circulation loop is composed of the exhaust port of the heat-increasing compressor, the four-way valve, the main heat exchanger, the first throttle valve, the main circuit of the economizer, the water-side heat exchanger, the four-way valve, the gas-liquid separator, and the intake port of the heat-increasing compressor. In the heating mode, the heat-increasing branch circuit and the heating circuit enable ultra-low temperature and safe operation. In the cooling mode, the circuit that lowers the temperature of the main heat exchanger enables ultra-high temperature and safe operation.

Description

Technical Field

[0001] The invention relates to a heat pump air-conditioning system. Background Art

[0002] The current existing technology, Chinese patent 202210673341.X, a super-low temperature heat pump system, includes a compressor, a first four-way valve, a second four-way valve, a first heat exchanger, a second heat exchanger, a three-way valve, a one-way valve, an economizer, a main electronic expansion valve, an auxiliary electronic expansion valve, a water-side heat exchanger, and a gas-liquid separator. The conversion between the cooling state, the heating state when the ambient temperature is greater than or equal to 20 degrees, and the heating state when the ambient temperature is less than 20 degrees is controlled by the second four-way valve and the main and auxiliary electronic expansion valves. The first four-way valve and the second four-way valve are provided and are respectively connected to the exhaust port of the compressor. When the ambient temperature is below -20 degrees, the second heat exchanger acts as a condenser, raising the ambient temperature and heating the first heat exchanger to achieve super-low temperature operation. The problem is that at low temperatures, the gas-liquid separator has the problem of liquid accumulation. Summary of the Invention

[0003] The object of the present invention is to provide a high-temperature and low-temperature heat pump air-conditioning system, which has the characteristics of no liquid accumulation in the gas-liquid separator and high-efficiency operation at high and low temperatures.

[0004] The present invention is implemented as follows: a high-temperature and low-temperature heat pump air-conditioning system, which is special in that it includes an enthalpy-increasing compressor, a four-way valve, a compound heat exchanger, a fan, an economizer, a water-side heat exchanger, a gas-liquid separator, a gas-liquid heat exchanger, a first throttle valve, a second throttle valve, a third throttle valve and an electric stop valve,

[0005] The composite heat exchanger includes a main heat exchanger and an auxiliary heat exchanger. The main heat exchanger and the auxiliary heat exchanger are arranged in front and back. The fan draws air on the main heat exchanger side, and the air flows from back to front.

[0006] The gas-liquid heat exchanger is arranged in the gas-liquid separator;

[0007] The exhaust port of the enthalpy increasing compressor, the four-way valve, the main heat exchanger, the first throttle valve, the main circuit of the economizer, the water side heat exchanger, the four-way valve, the gas-liquid separator and the air intake of the enthalpy increasing compressor constitute the main circulation loop.

[0008] In the heating state, the pipeline between the water-side heat exchanger and the economizer, the auxiliary heat exchanger, the gas-liquid heat exchanger, the third throttle valve, and the pipeline between the first throttle valve and the main heat exchanger constitute the heating circuit in the heating state. The pipeline between the economizer and the first throttle valve, the second throttle valve, the auxiliary line of the economizer and the air supply port of the enthalpy increase compression are connected to form the enthalpy increase branch; operate at minus 30 degrees;

[0009] In the cooling state, the pipeline between the economizer and the water-side heat exchanger, the auxiliary heat exchanger, the electric stop valve, and the pipeline between the water-side heat exchanger and the enthalpy-increasing compressor form a cooling circuit to reduce the temperature of the main heat exchanger, operating at 50 degrees above zero.

[0010] The high-temperature and low-temperature heat pump air-conditioning system is special in that the electric stop valve is a solenoid valve.

[0011] The high-temperature and low-temperature heat pump air-conditioning system is special in that it also includes a water receiving tray, a water wheel and a motor.

[0012] The compound heat exchanger is arranged in the water receiving tray, the water wheel is opposite to the compound heat exchanger, the motor drives the water wheel to rotate, and the water wheel sprays water onto the compound heat exchanger.

[0013] The high-temperature and low-temperature heat pump air-conditioning system is special in that the main heat exchanger is a fin-type heat exchanger.

[0014] The high-temperature and low-temperature heat pump air-conditioning system is special in that: in the heating state,

[0015] The exhaust port of the enthalpy increasing compressor, the D end of the four-way valve, the C end of the four-way valve, the water-side heat exchanger, the main circuit of the economizer, the first throttle valve, the main heat exchanger, the E end of the four-way valve, the S end of the four-way valve, the gas-liquid separator and the air intake of the enthalpy increasing compressor constitute a heating circuit;

[0016] In the refrigeration state, the exhaust port of the enthalpy increasing compressor, the D end of the four-way valve, the E end of the four-way valve, the main heat exchanger, the first throttle valve, the main circuit of the economizer, the water side heat exchanger, the C end of the four-way valve, the S end of the four-way valve, the gas-liquid separator and the suction port of the enthalpy increasing compressor constitute a refrigeration circuit.

[0017] The present invention provides a high-temperature and low-temperature heat pump air-conditioning system. In the heating state, the enthalpy increase branch and the heating circuit are set to achieve ultra-low temperature and safe operation; the cooling circuit is set to reduce the temperature of the main heat exchanger to achieve ultra-high temperature and safe operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an operation diagram of the heating state of the present invention.

[0019] Figure 2 This is the operating diagram of the heating state of the present invention DETAILED DESCRIPTION

[0020] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0022] like Figure 1 As shown, a high-temperature and low-temperature heat pump air-conditioning system includes an enthalpy-increasing compressor 1, a four-way valve 2, a compound heat exchanger 3, a fan 31, an economizer 4, a water-side heat exchanger 5, a gas-liquid separator 6, a gas-liquid heat exchanger 7, a first throttle valve 81, a second throttle valve 82, a third throttle valve 83 and an electric stop valve 9.

[0023] The composite heat exchanger 3 includes a main heat exchanger and an auxiliary heat exchanger, which are arranged in front and back. The fan 31 draws air on the main heat exchanger side, and the air flows from back to front.

[0024] The gas-liquid heat exchanger 7 is arranged in the gas-liquid separator 6;

[0025] The exhaust port 1A of the enthalpy increasing compressor 1, the four-way valve 2, the main heat exchanger, the first throttle valve 81, the main circuit of the economizer 4, the water side heat exchanger 5, the four-way valve 2, the gas-liquid separator 6 and the suction port 1B of the enthalpy increasing compressor 1 constitute the main circulation loop.

[0026] In the heating state, the pipeline between the water-side heat exchanger 5 and the economizer 4, the auxiliary heat exchanger, the gas-liquid heat exchanger 7, the third throttle valve 83, and the pipeline between the first throttle valve 81 and the main heat exchanger constitute the heating circuit in the heating state. The pipeline between the economizer 4 and the first throttle valve 81, the second throttle valve 82, the auxiliary circuit of the economizer 4, and the enthalpy-increasing compression air supply port 1C are connected to form the enthalpy-increasing branch. Operation at -30 degrees Celsius;

[0027] In the cooling state, the pipeline between the economizer 4 and the water-side heat exchanger 5, the auxiliary heat exchanger, the electric stop valve 9, and the pipeline between the water-side heat exchanger 5 and the enthalpy-increasing compressor 1 constitute a cooling circuit to reduce the temperature of the main heat exchanger, operating at 50 degrees above zero.

[0028] The electric stop valve 9 is a solenoid valve.

[0029] Further improvement of the present invention: further comprising a water receiving tray 101, a water wheel 102 and a motor,

[0030] The compound heat exchanger 3 is arranged in the water receiving tray 101 and is located above the water surface. The water wheel 102 is opposite to the compound heat exchanger 3. The motor drives the water wheel 102 to rotate, and the water wheel 102 sprays water onto the compound heat exchanger 3; it operates in the cooling state.

[0031] The main heat exchanger is a finned heat exchanger.

[0032] like Figure 1 As shown, the heating state,

[0033] After being compressed by the enthalpy-increasing compressor 1, the refrigerant is converted into a high-temperature and high-pressure gaseous refrigerant. The medium-temperature and medium-pressure refrigerant flows out from the exhaust port 1A of the enthalpy-increasing compressor 1, the D end of the four-way valve 2, the C end of the four-way valve 2, the water-side heat exchanger 5, the main path of the economizer 4, and is converted into a low-temperature and low-pressure refrigerant through the first throttle valve 81. The main heat exchanger, the E end of the four-way valve 2, the S end of the four-way valve 2, the gas-liquid separator 6, and the air intake port 1B of the enthalpy-increasing compressor 1 form a heating circuit.

[0034] The refrigerant flowing out of the main circuit of the economizer 4 is converted into low-temperature and low-pressure refrigerant by the second throttle valve 82 and enters the secondary circuit of the economizer. It then exchanges heat with the refrigerant in the main circuit of the economizer, thereby evaporating and forming a gaseous refrigerant that enters the air supply port 1C of the heat-increasing compressor 1, thereby increasing the compression capacity of the compressor, thereby obtaining a larger amount of hot refrigerant circulation and heating the water temperature more quickly.

[0035] At the same time, the medium-temperature, medium-pressure refrigerant flowing out of the water-side heat exchanger 5 enters the auxiliary heat exchanger, the gas-liquid heat exchanger 7 in the gas-liquid separator, and the third throttle valve 83 before entering the main heat exchanger. After passing through the main heat exchanger, the medium-temperature, medium-pressure refrigerant enters the gas-liquid separator 6. The gas-liquid heat exchanger 7 reheats the liquid refrigerant deposited in the gas-liquid separator 7, allowing the deposited liquid refrigerant to evaporate and circulate, thereby increasing the heating capacity. The medium-temperature, medium-pressure refrigerant entering the auxiliary heat exchanger heats the airflow temperature under the action of the fan, exchanging heat with the main heat exchanger, thereby raising the temperature of the main heat exchanger and preventing the refrigerant from being fully evaporated and deposited under low ambient temperatures, which could cause system fluorine deficiency, reduced capacity, and the compressor to be unable to return oil, resulting in burnout.

[0036] like Figure 2 As shown, in the refrigeration state, the refrigerant is compressed by the compressor to obtain a high-temperature and high-pressure gaseous refrigerant, which passes through the exhaust port 1A of the enthalpy increasing compressor, the D end of the four-way valve 2, the E end of the four-way valve 2, the main heat exchanger, the low-temperature and low-pressure refrigerant after throttling by the first throttle valve 81, the main circuit of the economizer 4, the water side heat exchanger 5, the C end of the four-way valve 2, the S end of the four-way valve 2, the gas-liquid separator 6 and the intake port 1B of the enthalpy increasing compressor 1 to form a refrigeration circuit.

[0037] At the same time, the low-temperature and low-pressure refrigerant flows out of the main circuit of economizer 4 and enters the auxiliary heat exchanger. The air flow is sucked and cooled by the fan and then passes through the main-side heat exchanger, thereby accelerating the cooling and lowering the condensation temperature. After the refrigeration circuit is throttled, the refrigerant temperature is lower, and the temperature difference between the heat exchange and heat transfer with the water-side heat exchanger is increased, thereby improving the cooling efficiency; after coming out of the auxiliary heat exchanger, the low-temperature and low-pressure refrigerant passes through the switch solenoid valve back to the main heat exchanger and enters the C port of the four-way valve, comes out from the S port to the vapor-liquid separator, and returns to the compressor suction port, forming a cycle.

[0038] When cooling, this system stores water in the water tank of the water receiving tray, adds a water pumping motor for spraying, assists the high-temperature heat exchanger for cooling, reduces the condensing temperature, increases the cooling capacity, and expands the use of the unit's cooling to higher ambient temperature conditions.

[0039] This system greatly improves the cooling capacity and energy efficiency, and can be used stably at higher ambient temperatures.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A high-temperature and low-temperature heat pump air conditioning system, characterized in that: It includes enthalpy increasing compressor, four-way valve, compound heat exchanger, fan, economizer, water side heat exchanger, gas-liquid separator, gas-liquid heat exchanger, first throttle valve, second throttle valve, third throttle valve and electric stop valve. The composite heat exchanger includes a main heat exchanger and an auxiliary heat exchanger. The main heat exchanger and the auxiliary heat exchanger are arranged in front and back. The fan draws air on the main heat exchanger side, and the air flows from back to front. The gas-liquid heat exchanger is arranged in the gas-liquid separator; The exhaust port of the enthalpy increasing compressor, the four-way valve, the main heat exchanger, the first throttle valve, the main circuit of the economizer, the water side heat exchanger, the four-way valve, the gas-liquid separator and the air intake of the enthalpy increasing compressor constitute the main circulation loop. In the heating state, the pipeline between the water-side heat exchanger and the economizer, the auxiliary heat exchanger, the gas-liquid heat exchanger, the third throttle valve, and the pipeline between the first throttle valve and the main heat exchanger constitute the heating circuit of the heating state. The pipeline between the economizer and the first throttle valve, the second throttle valve, the auxiliary line of the economizer and the air supply port of the enthalpy increase compression are connected to form the enthalpy increase branch. In the cooling state, the pipeline between the economizer and the water-side heat exchanger, the auxiliary heat exchanger, the electric stop valve, and the pipeline between the water-side heat exchanger and the enthalpy-increasing compressor constitute a cooling circuit to reduce the temperature of the main heat exchanger.

2. A high-temperature and low-temperature heat pump air conditioning system according to claim 1, characterized in that: The electric stop valve is a solenoid valve.

3. A high-temperature and low-temperature heat pump air conditioning system according to claim 1, characterized in that: It also includes a water tray, a water wheel and a motor. The compound heat exchanger is arranged in the water receiving tray, the water wheel is opposite to the compound heat exchanger, the motor drives the water wheel to rotate, and the water wheel sprays water onto the compound heat exchanger.

4. A high-temperature and low-temperature heat pump air conditioning system according to claim 1, characterized in that: The main heat exchanger is a finned heat exchanger.

5. The high-temperature and low-temperature heat pump air conditioning system according to claim 1, characterized in that: The heating state, The exhaust port of the enthalpy increasing compressor, the D end of the four-way valve, the C end of the four-way valve, the water-side heat exchanger, the main circuit of the economizer, the first throttle valve, the main heat exchanger, the E end of the four-way valve, the S end of the four-way valve, the gas-liquid separator and the air intake of the enthalpy increasing compressor constitute a heating circuit; In the refrigeration state, the exhaust port of the enthalpy increasing compressor, the D end of the four-way valve, the E end of the four-way valve, the main heat exchanger, the first throttle valve, the main circuit of the economizer, the water side heat exchanger, the C end of the four-way valve, the S end of the four-way valve, the gas-liquid separator and the suction port of the enthalpy increasing compressor constitute a refrigeration circuit.

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