Device capable of effectively increasing return air temperature

Abstract

The utility model relates to the technical field of direct expansion machine systems, and discloses a device capable of effectively improving return air temperature, which comprises a plate heat exchanger, a connecting pipe A and a connecting pipe B are arranged on the primary side of the plate heat exchanger, and a connecting pipe C and a connecting pipe D are arranged on the secondary side of the plate heat exchanger. A gas-liquid separator, a compressor and an oil separator are arranged between the connecting pipes, a return gas temperature control mechanism is arranged in each connecting pipe, heat exchange can be conducted on high-temperature gaseous Freon on the exhaust side and low-temperature gaseous Freon on the return gas side through the plate heat exchanger, the return gas temperature is increased, the temperature of exhaust entering the condenser is reduced, and the heat exchange efficiency is improved. The heat exchange effect of the system is improved, gas-state Freon subjected to heat exchange of the plate heat exchanger is subjected to gas-liquid separation in the gas separator and then enters the compressor, the liquid impact phenomenon of the compressor does not need to be worried about, compared with an existing direct expansion machine system, the return gas temperature can be effectively increased, a series of defects caused by the too low return gas temperature are avoided, and the energy consumption is reduced. Meanwhile, the refrigerating effect of the system is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of direct expansion machine systems, in particular to a device which can effectively increase the return air temperature. Background Art

[0002] The direct expansion air-conditioning system adopts the principle of direct expansion technology. Through the direct conversion between "refrigerant-air", it reduces the process of installing complex equipment such as cooling towers and water pumps in traditional air-conditioning water systems. The indoor and outdoor units only need to be connected by copper pipes to meet the cooling needs.

[0003] When the outlet air temperature of the direct expansion machine system is low, the return air temperature of the system will be relatively low. The lower return air temperature will reduce the refrigeration efficiency, and in severe cases it may even cause liquid hammer in the compressor and damage the compressor. Utility Model Content

[0004] The utility model aims to provide a device which can effectively increase the return air temperature, thereby solving the problem that when the air outlet temperature of the direct expansion machine system is low, the system return air temperature will be relatively low, and the low return air temperature will reduce the refrigeration efficiency, and in severe cases even cause liquid hammer in the compressor, thereby damaging the compressor.

[0005] An embodiment of the present application provides a device that can effectively increase the return air temperature, including a plate heat exchanger, wherein the primary side of the plate heat exchanger is equipped with connecting pipes B and A, a gas-liquid separator, a compressor, and an oil separator are arranged on the connecting pipe of the connecting pipe B, and a return air temperature control mechanism is arranged inside the connecting pipe, and connecting pipes C and D are installed on the secondary side of the plate heat exchanger.

[0006] Optionally, a plurality of groups of shunt pipes are installed at the lower end of the connecting pipe D, and solenoid valves are installed inside the plurality of groups of shunt pipes.

[0007] By adopting the above technical solution, the high-temperature gaseous Freon on the exhaust side and the low-temperature gaseous Freon on the return side can be heat exchanged through the plate heat exchanger, the return air temperature can be increased, the exhaust temperature entering the condenser can be reduced, and the heat exchange effect of the system can be improved. The gaseous Freon heat exchanged by the plate heat exchanger is separated into gas and liquid in the gas separator and then enters the compressor. There is no need to worry about liquid hammer in the compressor. Compared with the existing direct expansion machine system, the return air temperature can be effectively increased to avoid a series of disadvantages caused by too low return air temperature. At the same time, it does not affect the refrigeration effect of the system, and is safe and reliable.

[0008] By adopting the above technical solution, the opening quantity or opening degree of the valve is adjusted by the solenoid valve to achieve stable control of the gas temperature, ensuring stable, safe and effective operation of the entire system.

[0009] Optionally, the return air temperature control mechanism includes a first needle valve and a low-pressure switch, the first needle valve and the low-pressure switch are installed on the connecting pipe, and the first needle valve and the low-pressure switch are located between the plate heat exchanger and the gas-liquid separator.

[0010] By adopting the above technical solution, the low-pressure switch can serve as a low-pressure warning for the system, preventing the system from being unable to work normally due to being in a low-pressure state for a long time, and the first needle valve is convenient for on-site charging or discharging of refrigerant and on-site debugging and maintenance.

[0011] Optionally, a temperature sensor is installed on the connecting pipe between the gas-liquid separator and the compressor.

[0012] By adopting the above technical solution, the temperature of the connecting pipe between the gas-liquid separator and the compressor can be detected by the temperature sensor.

[0013] Optionally, an exhaust temperature sensor, a second needle valve, an H pressure sensor T7A and a high-pressure switch are installed inside the connecting pipe between the oil separator and the plate heat exchanger.

[0014] By adopting the above technical solution, the gas temperature inside the connecting pipe can be further regulated by the exhaust temperature sensor, the second needle valve, the H pressure sensor T7A and the high-pressure switch.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0016] The technical solution of the present application can perform heat exchange between high-temperature gaseous Freon on the exhaust side and low-temperature gaseous Freon on the return side through a plate heat exchanger, thereby increasing the return air temperature, reducing the exhaust temperature entering the condenser, and improving the heat exchange effect of the system. The gaseous Freon heat-exchanged by the plate heat exchanger is separated into gas and liquid in the gas separator and then enters the compressor. There is no need to worry about liquid hammer in the compressor. Compared with the existing direct expansion machine system, the return air temperature can be effectively increased to avoid a series of disadvantages caused by too low a return air temperature, while not affecting the refrigeration effect of the system, and is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0018] Figure 1 It is a front view schematic diagram of a device for effectively increasing the return air temperature according to the utility model.

[0019] In the figure: 1. Plate heat exchanger; 2. Pipe A; 3. Pipe B; 4. Pipe C; 5. Pipe D; 6. Diverter; 7. Solenoid valve; 8. First needle valve; 9. Low-pressure switch; 10. Gas-liquid separator; 11. Temperature sensor; 12. Compressor; 13. Oil separator; 14. Exhaust temperature sensor; 15. Second needle valve; 16. H pressure sensor T7A; 17. High-pressure switch. DETAILED DESCRIPTION

[0020] See also Figure 1 The utility model provides a technical solution: a device that can effectively increase the return air temperature, including a plate heat exchanger 1, a pipe B3 and a pipe A2 are installed on the primary side of the plate heat exchanger 1, and pipes C4 and D5 are installed on the secondary side. A connecting pipe is connected between the pipe B3 and the pipe C4, and a gas-liquid separator 10, a compressor 12, and an oil separator 13 are arranged between the connecting pipes, and a return air temperature control mechanism is arranged on the connecting pipeline, and the return air temperature control mechanism includes a first needle valve 8 and a low-pressure switch 9, the first needle valve 8 and the low-pressure switch 9 are installed on the connecting pipe, and the first needle valve 8 and the low-pressure switch 9 are located between the plate heat exchanger 1 and the gas-liquid separator 10.

[0021] In the technical solution of the utility model, the plate heat exchanger 1 can be used to perform heat exchange on the high-temperature gaseous Freon on the exhaust side and the low-temperature gaseous Freon on the return side, thereby increasing the return air temperature and reducing the exhaust temperature entering the condenser, thereby improving the heat exchange effect of the system. The gaseous Freon heat-exchanged by the plate heat exchanger 1 is separated into gas and liquid in the gas separator and then enters the compressor 12. There is no need to worry about liquid hammer in the compressor 12. Compared with the existing direct expansion machine system, the return air temperature can be effectively increased to avoid a series of disadvantages caused by too low a return air temperature, while not affecting the refrigeration effect of the system, and is safe and reliable.

[0022] In addition, the low-pressure switch 9 can serve as a low-pressure warning for the system to prevent the system from being unable to work normally due to being in a low-pressure state for a long time, and the first needle valve 8 is convenient for on-site charging or discharging of refrigerant and on-site debugging and maintenance.

[0023] In the technical solution of the utility model, if Figure 1 As shown, a temperature sensor 11 is installed on the connecting pipe between the gas-liquid separator 10 and the compressor 12. The temperature sensor 11 can detect the temperature of the connecting pipe between the gas-liquid separator 10 and the compressor 12. An exhaust temperature sensor 14, a second needle valve 15, an H pressure sensor T7A16 and a high-pressure switch 17 are installed inside the connecting pipe between the oil separator 13 and the plate heat exchanger 1. The exhaust temperature sensor 14, the second needle valve 15, the H pressure sensor T7A16 and the high-pressure switch 17 can further regulate the gas temperature inside the connecting pipe.

[0024] In the technical solution of the utility model, if Figure 1 As shown, a multi-group manifold 6 is installed at the lower end of the pipe D5 of the plate heat exchanger 1, and an electromagnetic valve 7 is installed on the pipe of the multi-group manifold 6. The setting of the manifold 6 can divert the airflow inside the pipe D5, and the electromagnetic valve 7 adjusts the opening quantity or opening degree of the valve to achieve stable control of the gas temperature, thereby ensuring stable, safe and effective operation of the entire system.

[0025] When in use, firstly, pipe A2, pipe B3, pipe C4 and pipe D5 can be connected through plate heat exchanger 1, pipe A2 is the low-temperature side of return air, pipe B3 is the high-temperature side of return air, pipe C4 is the high-temperature exhaust side, pipe D5 is the low-temperature exhaust side, the return air pipe and the exhaust pipe are heat exchanged through plate heat exchanger 1, the low-temperature gaseous Freon on the return air side is increased in temperature through heat exchange, and the high-temperature gaseous Freon on the exhaust side is reduced in temperature through heat exchange, a temperature sensor 11 is installed between the gas separator and the compressor 12, and the temperature here is monitored to determine whether to turn on the device for increasing the return air temperature, and an electromagnetic valve 7 is installed on the exhaust pipe after heat exchange cooling, and the opening number or opening degree of the electromagnetic valve 7 is controlled to achieve stable control of the temperature sensor 11, thereby ensuring stable, safe and effective operation of the entire system.

Claims

1. A device that can effectively increase the return air temperature, characterized in that: The invention comprises a plate heat exchanger (1), wherein a pipe B (3) and a pipe A (2) are installed on the primary side of the plate heat exchanger (1), and a pipe C (4) and a pipe D (5) are installed on the secondary side of the plate heat exchanger (1); a gas-liquid separator (10), a compressor (12) and an oil separator (13) are installed between the pipe B (3) and the pipe C (4) of the plate heat exchanger (1); a plurality of groups of shunt pipes (6) are installed on the pipeline of the pipe D (5); and a solenoid valve (7) is installed on the pipeline of the plurality of groups of shunt pipes (6); and the return air temperature control mechanism comprises a first needle valve (8) and a low-pressure switch (9); the first needle valve (8) and the low-pressure switch (9) are installed on the connecting pipe, and the first needle valve (8) and the low-pressure switch (9) are located between the plate heat exchanger (1) and the gas-liquid separator (10).

2. A device for effectively increasing the return air temperature according to claim 1, characterized in that: A temperature sensor (11) is installed on the connecting pipeline between the gas-liquid separator (10) and the compressor (12).

3. A device for effectively increasing the return air temperature according to claim 2, characterized in that: An exhaust temperature sensor (14), a second needle valve (15), an H pressure sensor T7A (16) and a high pressure switch (17) are installed on the connecting pipeline between the oil separator (13) and the plate heat exchanger (1).

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