Air water source heat pump type drying unit

Abstract

The air water source heat pump type drying unit comprises a compressor, an inner fin type condenser, a liquid storage device, an expansion valve, an inner fin type evaporator, an outer fin type evaporator, an outer tube shell type evaporator and a gas-liquid separator. An exhaust pipe of the compressor is sequentially connected with the inner finned condenser, the liquid storage device and the expansion valve, the expansion valve is connected with the first electromagnetic valve and the second electromagnetic valve, and the first electromagnetic valve is sequentially connected with the inner finned evaporator, the gas-liquid separator and an air suction pipe of the compressor. The second electromagnetic valve is connected with a third electromagnetic valve and a fourth electromagnetic valve, the third electromagnetic valve is sequentially connected with the outer finned evaporator, the gas-liquid separator and an air suction pipe of the compressor, and the fourth electromagnetic valve is sequentially connected with the outer shell-and-tube evaporator, the gas-liquid separator and the air suction pipe of the compressor; a water inlet and a water outlet of the outer shell-and-tube evaporator are connected with an underground water well; and fans are mounted on the inner finned condenser, the inner finned evaporator and the outer finned evaporator.

Description

Technical Field

[0001] The utility model belongs to the technical field of drying equipment, and relates to a water-source heat pump drying unit. Background Art

[0002] When the existing dryers for drying products such as medicinal materials, crops, and seafood increase the temperature, the external circulation of the heat exchange method is air heat exchange or electric heating. When the outdoor temperature is lower than 0 °C, the evaporator will start to frost, and the defrosting process affects the drying temperature; the electric heating method also has the disadvantages of high energy consumption and fast loss. Content of the Utility Model

[0003] To solve the above technical problems, the purpose of the utility model is to provide a water-source heat pump drying unit, which increases groundwater heat exchange and can be used in any season of the year. Utilizing water-source heat pump technology, the solar energy and geothermal energy absorbed by the shallow groundwater source on the earth's surface are extracted and applied.

[0004] The utility model provides a water-source heat pump drying unit, including: a compressor, an internal finned condenser, a liquid receiver, a filter, an expansion valve, an internal finned evaporator, an external finned evaporator, an external shell-and-tube evaporator, and a gas-liquid separator; the exhaust pipe of the compressor is sequentially connected to the internal finned condenser, the liquid receiver, the filter, and the expansion valve, the expansion valve is respectively connected to a first solenoid valve and a second solenoid valve, the first solenoid valve is sequentially connected to the internal finned evaporator, the gas-liquid separator, and the suction pipe of the compressor; the second solenoid valve is respectively connected to a third solenoid valve and a fourth solenoid valve, the third solenoid valve is sequentially connected to the external finned evaporator, the gas-liquid separator, and the suction pipe of the compressor, the fourth solenoid valve is sequentially connected to the external shell-and-tube evaporator, the gas-liquid separator, and the suction pipe of the compressor; the water inlet pipe of the external shell-and-tube evaporator is connected to a groundwater extraction well through a pipeline, and the water outlet pipe of the external shell-and-tube evaporator is connected to a groundwater return well through a pipeline; fans are installed on the internal finned condenser, the internal finned evaporator, and the external finned evaporator.

[0005] Further, pressure switches and temperature sensors are provided on the exhaust pipe and the suction pipe of the compressor.

[0006] Further, a water flow switch and a temperature sensor are also provided on the water outlet pipe of the external shell-and-tube evaporator.

[0007] Further, the drying unit further includes a controller, and the temperature sensor, the pressure switch, and the water flow switch are all connected to the controller; when the pressure value in the pipeline exceeds the pressure setting threshold, the controller controls the drying unit to stop; when the water inflow is lower than the water volume setting threshold, the controller controls the drying unit to stop.

[0008] Further, the drying unit includes two drying modes: air-source drying and water-source heat pump drying;

[0009] In the air source drying mode, the second solenoid valve and the third solenoid valve are opened, and the first solenoid valve and the fourth solenoid valve are closed; the compressor, the internal finned condenser, the liquid receiver, the filter, the expansion valve, the second solenoid valve, the third solenoid valve, the external finned evaporator and the gas-liquid separator connected in sequence form an air source drying circuit; in the water source heat pump drying mode, the second solenoid valve and the fourth solenoid valve are opened, and the first solenoid valve and the third solenoid valve are closed; the compressor, the internal finned condenser, the liquid receiver, the filter, the expansion valve, the second solenoid valve, the fourth solenoid valve, the external shell-and-tube evaporator and the gas-liquid separator connected in sequence form a water source heat pump drying circuit.

[0010] Furthermore, the drying unit further includes a dehumidification mode. When the temperature in the drying chamber reaches the set value, the first solenoid valve is opened while the second solenoid valve, the third solenoid valve and the fourth solenoid valve are closed, and the dehumidification mode is entered; the compressor, the internal finned condenser, the liquid receiver, the filter, the expansion valve, the first solenoid valve, the internal finned evaporator and the gas-liquid separator connected in sequence form a dehumidification circuit; a water receiving tray is arranged below the fins of the internal finned evaporator, and the bottom of the water receiving tray is connected to a condensate pipe.

[0011] A water-air source heat pump drying unit of the present utility model is provided with an external finned evaporator, an external shell-and-tube evaporator and a gas-liquid separator, and can control the on-off states of 4 solenoid valves according to the outdoor temperature, so as to realize the switching between two drying modes of air source drying and water source heat pump drying. When the temperature in the drying chamber reaches the set value, the first solenoid valve can also be opened while other solenoid valves are closed to achieve the purpose of dehumidification and moisture removal. Description of the Drawings

[0012] Figure 1 is a schematic diagram of a water-air source heat pump drying unit of the present utility model;

[0013] 1 - Compressor, 2 - Internal finned condenser, 3 - Liquid receiver, 4 - Filter, 5 - Expansion valve, 6 - Internal finned evaporator, 7 - External finned evaporator, 8 - External shell-and-tube evaporator, 9 - Gas-liquid separator, 10 - First solenoid valve, 11 - Second solenoid valve, 12 - Third solenoid valve, 13 - Fourth solenoid valve, 14 - Pressure switch, 15 - Temperature sensor, 16 - Water flow switch, 17 - Underground water extraction well, 18 - Underground water injection well, 19 - Water receiving tray, 20 - Condensate pipe. Detailed Embodiments

[0014] As Figure 1As shown in the figure, a kind of wind and water source heat pump drying unit of the utility model comprises: a compressor 1, an internal fin condenser 2, a liquid receiver 3, a filter 4, an expansion valve 5, an internal fin evaporator 6, an external fin evaporator 7, an external shell-and-tube evaporator 8 and a gas-liquid separator 9. The exhaust pipe of the compressor 1 is sequentially connected to the internal fin condenser 2, the liquid receiver 3, the filter 4 and the expansion valve 5. The expansion valve 5 is respectively connected to a first solenoid valve 10 and a second solenoid valve 11. The first solenoid valve 10 is sequentially connected to the internal fin evaporator 6, the gas-liquid separator 9 and the suction pipe of the compressor. The second solenoid valve 11 is respectively connected to a third solenoid valve 12 and a fourth solenoid valve 13. The third solenoid valve 12 is sequentially connected to the external fin evaporator 7, the gas-liquid separator 9 and the suction pipe of the compressor. The fourth solenoid valve 13 is sequentially connected to the external shell-and-tube evaporator 8, the gas-liquid separator 9 and the suction pipe of the compressor. The water inlet pipe of the external shell-and-tube evaporator 8 is connected to an underground water extraction well 17 through a pipeline, and the water outlet pipe of the external shell-and-tube evaporator is connected to an underground water injection well 18 through a pipeline. A water extraction pump is arranged in the underground water extraction well 17. Fans are installed on the internal fin condenser 2, the internal fin evaporator 6 and the external fin evaporator 7.

[0015] A pressure switch 14 and a temperature sensor 15 are arranged on the exhaust pipe and the suction pipe of the compressor 1. A water flow switch 16 and a temperature sensor 15 are also arranged on the water outlet pipe of the external shell-and-tube evaporator 8.

[0016] The drying unit also comprises a controller. The temperature sensor 15, the pressure switch 14 and the water flow switch 16 are all connected to the controller. When the pressure value in the pipeline exceeds the pressure setting threshold, the controller controls the drying unit to stop; when the water inflow is lower than the water volume setting threshold, the controller controls the drying unit to stop. The controller is also used to control the opening and closing of the first solenoid valve 10, the second solenoid valve 11, the third solenoid valve 12 and the second solenoid valve 13.

[0017] The wind and water source heat pump drying unit of the utility model comprises two drying modes: wind source drying and water source heat pump drying.

[0018] In the air source drying mode, the second solenoid valve 11 and the third solenoid valve 12 are opened, and the first solenoid valve 10 and the fourth solenoid valve 13 are closed. The compressor 1, the internal finned condenser 2, the liquid receiver 3, the filter 4, the expansion valve 5, the second solenoid valve 11, the third solenoid valve 12, the external finned evaporator 7 and the gas-liquid separator 9 connected in sequence form an air source drying circuit. At this time, the low-temperature and low-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the work of the compressor 1 and discharged from the exhaust pipe of the compressor. The high-temperature and high-pressure gaseous refrigerant enters the internal finned condenser 2 to cool and release heat to form a liquid refrigerant. The released heat is discharged into the drying chamber under the heat dissipation of the fan installed on the internal finned condenser 2 to achieve the temperature increase process. The liquid refrigerant flows through the filter 4 to filter impurities and moisture. The high-pressure liquid refrigerant passing through the expansion valve 5 passes through a narrow channel, the pressure decreases, and the temperature also decreases accordingly, becoming a low-temperature and medium-pressure liquid or a gas-liquid two-phase mixture. The refrigerant mixture enters the external finned evaporator 7 through the second solenoid valve 11 and the third solenoid valve 12 to absorb heat and evaporate and gasify completely into a medium-temperature and low-pressure gaseous refrigerant. Under the action of the fan installed on the external finned evaporator 7, the cold quantity is discharged into the outdoor air. After the medium-temperature and low-pressure gaseous refrigerant that has absorbed heat is separated by gas-liquid separation, the gaseous refrigerant is sucked in by the compressor 1 and then discharged to realize the circulation of the refrigerant in the pipeline.

[0019] In the water source heat pump drying mode, the second solenoid valve 11 and the fourth solenoid valve 13 are opened, and the first solenoid valve 10 and the third solenoid valve 12 are closed. The compressor 1, the internal finned condenser 2, the liquid receiver 3, the filter 4, the expansion valve 5, the second solenoid valve 11, the fourth solenoid valve 13, the external shell-and-tube evaporator 8 and the gas-liquid separator 9 connected in sequence form a water source heat pump drying circuit.

[0020] In the water source heat pump drying mode, the temperature increase process of the drying chamber is the same as that in the air source drying mode. The liquid refrigerant flows through the filter 4 to filter impurities and moisture. The high-pressure liquid refrigerant passing through the expansion valve 5 passes through a narrow channel, the pressure decreases, and the temperature also decreases accordingly, becoming a low-temperature and medium-pressure liquid or a gas-liquid two-phase mixture. The refrigerant mixture enters the external shell-and-tube evaporator 8 through the second solenoid valve 11 and the fourth solenoid valve 13 to exchange heat with the groundwater. The cold quantity is carried out by the groundwater and becomes a medium-temperature and low-pressure gaseous refrigerant. After the medium-temperature and low-pressure gaseous refrigerant that has absorbed heat is separated by gas-liquid separation, the gaseous refrigerant is sucked in by the compressor 1 and then discharged to realize the circulation of the refrigerant in the pipeline.

[0021] The drying unit further includes a dehumidification mode. When the temperature in the drying chamber reaches the set value, the first solenoid valve 10 is opened while the second solenoid valve 11, the third solenoid valve 12, and the fourth solenoid valve 13 are closed, and the dehumidification mode is entered. The compressor 1, the internal fin condenser 2, the liquid receiver 3, the filter 4, the expansion valve 5, the first solenoid valve 10, the internal fin evaporator 6, and the gas-liquid separator 9 that are connected in sequence form a dehumidification circuit. A water receiving tray 19 is arranged below the fins of the internal fin evaporator 6, and the bottom of the water receiving tray is connected to a condensate pipe 20. The air heated by the internal fin condenser 2 and the air cooled by the internal fin evaporator 6 generate condensation on the fins of the internal fin evaporator 6 and are discharged through the condensate pipe 20, thereby heating and dehumidifying the air.

[0022] When the outdoor temperature of the drying chamber is higher than 5 °C, the air source drying mode is adopted; when the outdoor temperature of the drying chamber is lower than 5 °C, the water source heat pump drying mode is adopted; when the temperature in the drying chamber reaches the set value, the first solenoid valve is opened, and the second solenoid valve, the third solenoid valve, and the fourth solenoid valve are closed to achieve the purpose of dehumidifying and discharging moisture.

[0023] The above are only the preferred embodiments of the present invention and are not intended to limit the idea of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wind and water source heat pump drying unit, characterized in that: include: A compressor, an inner fin condenser, a liquid reservoir, a filter, an expansion valve, an inner fin evaporator, an outer fin evaporator, an outer tube shell evaporator and a gas-liquid separator; the exhaust pipe of the compressor is connected to the inner fin condenser, the liquid reservoir, the filter and the expansion valve in sequence, the expansion valve is connected to the first solenoid valve and the second solenoid valve respectively, the first solenoid valve is connected to the inner fin evaporator, the gas-liquid separator and the suction pipe of the compressor in sequence; the second solenoid valve is connected to the third solenoid valve and the fourth solenoid valve respectively, the third solenoid valve is connected to the outer fin evaporator, the gas-liquid separator and the suction pipe of the compressor in sequence, the fourth solenoid valve is connected to the outer tube shell evaporator, the gas-liquid separator and the suction pipe of the compressor in sequence; the water inlet pipe of the outer tube shell evaporator is connected to the underground water well through a pipeline, and the water outlet pipe of the outer tube shell evaporator is connected to the underground water return well through a pipeline; fans are installed on the inner fin condenser, the inner fin evaporator and the outer fin evaporator.

2. The wind and water source heat pump drying unit according to claim 1, characterized in that: The exhaust pipe and the intake pipe of the compressor are provided with a pressure switch and a temperature sensor.

3. The wind and water source heat pump drying unit according to claim 2, characterized in that: A water flow switch and a temperature sensor are also provided on the water outlet pipe of the outer shell and tube evaporator.

4. The wind and water source heat pump drying unit according to claim 3, characterized in that: The drying unit also includes a controller, and the temperature sensor, pressure switch and water flow switch are all connected to the controller; when the pressure value in the pipeline exceeds the pressure setting threshold, the controller controls the drying unit to shut down; when the water intake is lower than the water volume setting threshold, the controller controls the drying unit to shut down.

5. The wind and water source heat pump drying unit according to claim 1, characterized in that: The drying unit includes two drying modes: air source drying and water source heat pump drying; In the air source drying mode, the second solenoid valve and the third solenoid valve are opened, and the first solenoid valve and the fourth solenoid valve are closed; the compressor, the inner finned condenser, the liquid storage, the filter, the expansion valve, the second solenoid valve, the third solenoid valve, the outer finned evaporator and the gas-liquid separator connected in sequence constitute an air source drying circuit; In the water source heat pump drying mode, the second solenoid valve and the fourth solenoid valve are opened, and the first solenoid valve and the third solenoid valve are closed; the compressor, internal finned condenser, liquid storage tank, filter, expansion valve, second solenoid valve, fourth solenoid valve, outer shell and tube evaporator and gas-liquid separator connected in sequence constitute a water source heat pump drying circuit.

6. The wind and water source heat pump drying unit according to claim 1, characterized in that: The drying unit also includes a dehumidification mode. When the temperature in the drying chamber reaches a set value, the first solenoid valve is opened and the second, third and fourth solenoid valves are closed to enter the dehumidification mode. The compressor, internal finned condenser, liquid storage, filter, expansion valve, first solenoid valve, internal finned evaporator and gas-liquid separator connected in sequence constitute a dehumidification circuit. A water receiving tray is arranged under the fins of the internal finned evaporator, and the bottom of the water receiving tray is connected to a condensed water pipe.

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