Heat pump drying and dehumidifying system with double electronic expansion valves

Abstract

A heat pump drying and dehumidifying system with double electronic expansion valves comprises a compressor, a four-way valve, a heating condenser, a first electronic expansion valve, an external heat exchanger, a liquid storage tank, a second electronic expansion valve, a dehumidifying evaporator and a gas-liquid separator, a D port of the four-way valve is connected with the output end of the compressor, and a C port of the four-way valve is connected with the input end of the heating condenser; a port S of the four-way valve is connected with the input end of the gas-liquid separator, and a port E of the four-way valve is connected with one end of the external heat exchanger. According to the heat pump system, two electromagnetic valves are replaced by the two electronic expansion valves, the heat pump system has the heating function, the dehumidification function and the cooling function, the pipeline is optimized, the cost is reduced, and the refrigerant stock of the pipeline is small.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a double electronic expansion valve heat pump drying and dehumidification system. Background Art

[0002] The heat pump drying and dehumidification system has heating and dehumidification functions, such as a heat pump drying and dehumidification machine with Chinese patent publication number CN202792733U, including an evaporator, a compressor, a heating condenser and an electronic expansion valve, the evaporator includes an external evaporator and a dehumidification evaporator, a four-way valve is connected to the outside of the compressor, the passage of the four-way valve is respectively connected to the heating condenser, the gas-liquid separator, the parallel external evaporator and the dehumidification evaporator, one end of the electronic expansion valve is connected to the heating condenser, the other end of the electronic expansion valve is connected to the parallel external evaporator and the dehumidification evaporator, the outer side of the external evaporator and the dehumidification evaporator are provided with solenoid valves, a one-way valve is provided between the dehumidification evaporator and the four-way valve, and a pressure relief solenoid valve is connected in parallel to the electronic expansion valve. This kind of heat pump system requires two solenoid valves for switching, which is more expensive, and there is a large amount of refrigerant in the system. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a double electronic expansion valve heat pump drying and dehumidification system, which can reduce the cost and the stock of refrigerant.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a dual electronic expansion valve heat pump drying and dehumidification system, including a compressor, a four-way valve, a heating condenser, a first electronic expansion valve, an external heat exchanger, a liquid storage tank, a second electronic expansion valve, a dehumidification evaporator and a gas-liquid separator, wherein the D port of the four-way valve is connected to the output end of the compressor, the C port of the four-way valve is connected to the input end of the heating condenser, the S port of the four-way valve is connected to the input end of the gas-liquid separator, and the E port of the four-way valve is connected to one end of the external heat exchanger;

[0005] When the temperature is increased, the medium output from the compressor output end passes through the four-way valve, the temperature-increasing condenser, the first non-return valve, the first expansion valve, the external heat exchanger, the four-way valve, the gas-liquid separator and the compressor input end in sequence;

[0006] When dehumidifying, the medium output from the compressor output end passes through the four-way valve, the temperature-raising condenser, the first non-return valve, the liquid storage tank, the second electronic expansion valve, the dehumidification evaporator, the gas-liquid separator and the compressor input end in sequence;

[0007] When cooling, the medium output from the compressor output end passes through the four-way valve, the external heat exchanger, the second one-way valve, the liquid storage tank, the second electronic expansion valve, the dehumidification evaporator, the gas-liquid separator and the compressor input end in sequence.

[0008] Compared with the prior art, the utility model has the following beneficial effects:

[0009] The utility model utilizes two electronic expansion valves to replace two electromagnetic valves, the heat pump system has heating function, dehumidification function and cooling function, the pipeline is optimized, the cost is reduced, and the amount of pipeline refrigerant is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the pipeline diagram of the utility model. DETAILED DESCRIPTION

[0011] The utility model will be further described below in conjunction with the accompanying drawings.

[0012] like Figure 1 As shown, a dual electronic expansion valve heat pump drying and dehumidification system includes a compressor, a four-way valve, a heating condenser, a first electronic expansion valve, an external heat exchanger, a liquid storage tank, a second electronic expansion valve, a dehumidification evaporator and a gas-liquid separator. The D port of the four-way valve is connected to the output end of the compressor, the C port of the four-way valve is connected to the input end of the heating condenser, the S port of the four-way valve is connected to the input end of the gas-liquid separator, and the E port of the four-way valve is connected to one end of the external heat exchanger.

[0013] When the temperature rises, the medium output from the compressor output end passes through the four-way valve, the heating condenser, the first non-return valve, the first expansion valve, the external heat exchanger, the four-way valve, the gas-liquid separator and the compressor input end in sequence; the external heat exchanger of this cycle is equivalent to the external evaporator, and the heating condenser plays the function of heating and heating.

[0014] When dehumidifying, the medium output from the compressor output end passes through the four-way valve, the heating condenser, the first one-way valve, the liquid storage tank, the second electronic expansion valve, the dehumidification evaporator, the gas-liquid separator and the compressor input end in sequence.

[0015] When cooling, the medium output from the compressor output end passes through the four-way valve, external heat exchanger, second one-way valve, liquid storage tank, second electronic expansion valve, dehumidification evaporator, gas-liquid separator and compressor input end in sequence; the external heat exchanger of this cycle is equivalent to an external condenser, and the system can reduce the heat of the refrigerant and thus cool down.

Claims

1. A dual electronic expansion valve heat pump drying and dehumidification system, characterized in that: It includes a compressor, a four-way valve, a heating condenser, a first electronic expansion valve, an external heat exchanger, a liquid storage tank, a second electronic expansion valve, a dehumidification evaporator and a gas-liquid separator, wherein the D port of the four-way valve is connected to the output end of the compressor, the C port of the four-way valve is connected to the input end of the heating condenser, the S port of the four-way valve is connected to the input end of the gas-liquid separator, and the E port of the four-way valve is connected to one end of the external heat exchanger; When the temperature is increased, the medium output from the compressor output end passes through the four-way valve, the temperature-increasing condenser, the first non-return valve, the first expansion valve, the external heat exchanger, the four-way valve, the gas-liquid separator and the compressor input end in sequence; When dehumidifying, the medium output from the compressor output end passes through the four-way valve, the temperature-raising condenser, the first non-return valve, the liquid storage tank, the second electronic expansion valve, the dehumidification evaporator, the gas-liquid separator and the compressor input end in sequence; When cooling, the medium output from the compressor output end passes through the four-way valve, the external heat exchanger, the second one-way valve, the liquid storage tank, the second electronic expansion valve, the dehumidification evaporator, the gas-liquid separator and the compressor input end in sequence.

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