Low-temperature refrigeration dehumidification system

Abstract

The utility model discloses a low-temperature refrigeration dehumidification system which comprises a heating water tank, a shell and tube type condenser, an electric heater, a finned evaporator, a finned condenser, a refrigeration compressor and an air feeder, the water inlet end of the heating water tank is communicated and connected with a water inlet pipe, and the water outlet end of the heating water tank is communicated and connected with a refrigerant inlet of the shell and tube type condenser. The output end of the shell and tube condenser is communicated with the input end of the finned evaporator, the output end of the finned evaporator is communicated with the input end of the refrigeration compressor, the finned evaporator is located at a lower air opening of the environment where the finned evaporator is located, and the output end of the refrigeration compressor is communicated with the input end of the finned condenser. The output end of the refrigeration compressor is communicated and connected with the input end of the finned condenser, the output end of the refrigeration compressor is communicated and connected with the input end of the finned condenser and located at the rear end of the finned evaporator, and the rear end of the finned condenser is provided with an air feeder. The air conditioner can adapt to the low-temperature environment, is high in dehumidification capacity, improves the dehumidification capacity and can operate at the low temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of dehumidification devices, in particular to a low-temperature refrigeration dehumidification system. Background Art

[0002] In many scenarios, refrigerated dehumidifiers are needed to cool and dehumidify, thereby outputting dry air. For example, in an underground factory, the space environment is humid and low in temperature, and the water source used is often groundwater, which has a low temperature. In this environment, if a dehumidifier composed of a traditional evaporator and condenser is used, its cooling and dehumidification effect is not ideal. This is mainly because traditional refrigerated dehumidifiers of this type will produce frost when running at such low temperatures, which will lead to low working efficiency of the dehumidifier and condensation low pressure alarms. Therefore, this type of traditional refrigerated dehumidifier cannot adapt to low-temperature and humid environments such as underground factories or traditional corridors, and the dehumidification effect is not ideal, and frost problems are prone to occur. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a low-temperature refrigeration and dehumidification system, which can solve the problems described in the background technology.

[0004] The technical solution for achieving the purpose of the utility model is: a low-temperature refrigeration and dehumidification system, including a heating water tank, a shell and tube condenser, an electric heater, a finned evaporator, a finned condenser, a refrigeration compressor and a blower, the water inlet end of the heating water tank is connected to the water inlet pipe, the water outlet end of the heating water tank is connected to the refrigerant inlet of the shell and tube condenser, the output end of the shell and tube condenser is connected to the input end of the finned evaporator,

[0005] The output end of the finned evaporator is connected to the input end of the refrigeration compressor, and the finned evaporator is located at the downwind outlet of the environment.

[0006] The output end of the refrigeration compressor is connected to the input end of the finned condenser, and the output end of the refrigeration compressor is connected to the input end of the finned condenser.

[0007] The input end of the finned condenser is connected to the rear end of the finned evaporator. The rear end of the finned condenser is provided with a blower. The air inlet of the blower faces the finned condenser, and the air outlet faces the end away from the finned condenser.

[0008] Furthermore, it also includes a proportional-integral three-way water valve, a first end of the proportional-integral three-way water valve is connected to the refrigerant inlet of the shell and tube condenser, a second end of the proportional-integral three-way water valve is connected to the refrigerant outlet of the shell and tube condenser, and a third end of the proportional-integral three-way water valve is connected to the water outlet pipe.

[0009] Furthermore, a temperature sensor and a third pressure sensor are installed on the water outlet pipe connected to the proportional-integral three-way water valve.

[0010] Furthermore, a drying filter and a throttling expansion valve are installed on the communication path between the output end of the shell and tube condenser and the input end of the fin evaporator. A one-way valve is also installed on the communication path. The one-way valve is located on one side of the communication path close to the output end of the shell and tube condenser.

[0011] Furthermore, it also includes a filter, and the filter and the electric heater are arranged in sequence along the direction from the upwind port to the fin-type evaporator, and the filter and the electric heater are located between the upwind port and the fin-type evaporator.

[0012] Furthermore, the output end of the finned evaporator is connected to the input end of the refrigeration compressor through a first pipeline.

[0013] Furthermore, a first pressure sensor is installed on the first pipeline, and the first pressure sensor is located on a side of the pipeline close to the refrigeration compressor.

[0014] Furthermore, the first pipeline is also connected to the output end of the refrigeration compressor through a bypass pipeline, and a hot gas bypass valve is also installed on the bypass pipeline.

[0015] Furthermore, the output end of the finned condenser is connected to the input end of the shell and tube condenser through a second pipe, and a solenoid valve is installed on the second pipe. The solenoid valve is located on a side of the second pipe close to the shell and tube condenser.

[0016] Furthermore, the second pipe is also connected to an end of the communication path close to the shell and tube condenser.

[0017] The beneficial effects of the utility model are as follows: compared with the traditional refrigeration dehumidifier, the utility model can ensure that the water inlet temperature of the shell and tube heat exchanger is above a certain water temperature by installing a heating water tank in front of the shell and tube condenser. When the water inlet temperature is low, the heating in the electric water tank is started, so that it can adapt to the low-temperature water source used in the environment. Among them, the proportional integral three-way valve is installed at the inlet and outlet of the shell and tube condenser. By detecting the cooling inlet and outlet water temperature data, the proportional integral three-way valve controls and adjusts the water flow rate of the water inlet entering the shell and tube condenser, and the excess water is bypassed to the condensation outlet pipeline to ensure the minimum water flow rate and ensure that the condensation pressure is within the operating range, so as to adjust the water temperature and water flow rate of the shell and tube condenser. By installing an electric heater in front of the finned evaporator, it is ensured that the air temperature entering the finned evaporator is high, which can effectively improve the dehumidification capacity of the evaporator, improve the air inlet conditions, and increase the dehumidification capacity. By installing a hot gas bypass valve in the bypass pipeline, the low-temperature operation of the system can be guaranteed (the lowest temperature can be as low as 15°C). BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the principle of the utility model;

[0019] Figure 2 It is a schematic diagram of the structural connection of the utility model;

[0020] In the figure,

[0021] 1-first pipeline, 2-second pipeline, 3-first pressure sensor, 4-second pressure sensor, 5-temperature sensor, 6-third pressure sensor, 7-proportional integral three-way water valve, 8-solenoid valve, 9-check valve, 10-drying filter, 11-throttling expansion valve, 12-blower, 13-finned condenser, 14-refrigeration compressor, 15-finned evaporator, 16-electric heater, 17-filter, 18-shell and tube condenser, 19-heating water tank,

[0022] The arrows in the figure indicate the flow direction. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific implementation plans:

[0024] like Figure 1-Figure 2 As shown, a low-temperature refrigeration and dehumidification system includes a heating water tank 19, a proportional integral three-way water valve 7, a shell and tube condenser 18, an electric heater 16, a finned evaporator 15, a finned condenser 13, a refrigeration compressor 14 and a blower 12. The water inlet end of the heating water tank 19 is connected to a water inlet pipe (not shown in the figure), and the water inlet pipe is used to connect to an external water source so that low-temperature water can be introduced, and the temperature of the low-temperature water is ≥15°. The water outlet end of the heating water tank 19 and the first end of the proportional integral three-way water valve 7 are both connected to the refrigerant inlet of the shell and tube condenser 18, the second end of the proportional integral three-way water valve 7 is connected to the refrigerant outlet of the shell and tube condenser 18, and the third end of the proportional integral three-way water valve 7 is connected to the water outlet pipe, which is used to drain water to the outside. The output end of the shell and tube condenser 18 is connected to the input end of the finned evaporator 15, and the shell and tube condenser 18 can be connected to the finned evaporator 15 through a pipeline.

[0025] In an optional embodiment, a filter dryer 10 and a throttling expansion valve 11 are further installed on the communication path between the output end of the shell and tube condenser 18 and the input end of the finned evaporator 15. The filter dryer 10 is used to filter impurities and absorb moisture, and the throttling expansion valve 11 is used for throttling. A one-way valve 9 is also installed on the communication path, and the one-way valve 9 is located on one side of the communication path close to the output end of the shell and tube condenser 18.

[0026] The input end of the filter drier 10 is provided with a coarse metal mesh, and the outlet end is provided with a fine metal mesh, so that larger particles of impurities can be effectively filtered out, and a desiccant with excellent moisture absorption properties is placed between the two metal meshes to absorb moisture in the refrigerant output from the output end of the shell and tube condenser 18, so as to ensure that the communication path is unobstructed and the refrigerant can be used normally in the subsequent finned evaporator 15. The communication path can be a capillary tube or other types of pipelines.

[0027] The throttling expansion valve 11 plays a throttling role by adjusting the flow rate, which can convert the high-temperature and high-pressure liquid refrigerant into a low-temperature and low-pressure mist refrigerant, creating conditions for the evaporation of the refrigerant. It can also automatically adjust the refrigerant flow entering the evaporator according to the heat signal obtained by the temperature sensor 5 to adapt to the change of the refrigeration load. At the same time, it can also maintain the superheat. By adjusting the flow rate, it can keep the evaporator within a certain superheat range to prevent abnormal overheating.

[0028] In an optional embodiment, a temperature sensor 5 and a third pressure sensor 6 are also installed on the water outlet pipe connected to the proportional integral three-way water valve 7 to measure the temperature and water pressure of the water flow in the water outlet pipe, so as to use these parameters of temperature and water pressure to control the operation of the proportional integral three-way water valve 7, and the operation includes controlling the opening and closing degree of the third end of the proportional integral three-way water valve 7, including fully open, fully closed and partially open states between fully open and fully closed.

[0029] The output end of the finned evaporator 15 is connected to the input end of the refrigeration compressor 14 through the first pipe 1, and the first pipe 1 is a low-pressure pipe (i.e., a pipe that does not need to withstand high pressure). The finned evaporator 15 is located at the downwind of the environment so that the wind blows toward and passes through the finned evaporator 15. Since the environment is a low-temperature and humid environment, the flowing wind carries a large amount of moisture. The finned evaporator 15 is used to absorb the heat carried by the passing wind, that is, it plays a role of heat absorption and gasification to vaporize the moisture in the passing wind.

[0030] In an optional embodiment, a filter 17 and an electric heater 16 are sequentially arranged along the direction from the upper air port to the fin-type evaporator 15, and the filter 17 and the electric heater 16 are located between the upper air port and the fin-type evaporator 15. The filter 17 is used to filter out impurities (such as dust) carried in the flowing wind, and the electric heater 16 is used to heat the flowing wind, so that the air (i.e., the flowing wind) is heated and then transported to the electric heater 16, so as to ensure that the temperature of the air entering the fin-type evaporator 15 is high, which can effectively improve the dehumidification capacity of the evaporator.

[0031] In an optional embodiment, a first pressure sensor 3 is further installed on the first pipeline 1, and the first pressure sensor 3 is located on a side of the pipeline close to the refrigeration compressor 14. The first pressure sensor 3 can measure the pressure in the first pipeline 1 entering the refrigeration compressor 14.

[0032] The output end of the refrigeration compressor 14 is connected to the input end of the finned condenser 13 , and the output end of the refrigeration compressor 14 is connected to the input end of the finned condenser 13 through a pipeline A (not shown in the figure), and a second pressure sensor 4 is also installed on the first pipeline 1 .

[0033] In an optional embodiment, the first pipeline 1 is also connected to the output end of the refrigeration compressor 14 through a bypass pipeline, and a hot gas bypass valve is also installed on the bypass pipeline. The hot gas bypass valve is a mechanical device that uses the balance principle of refrigerant pressure and elastic force to control the valve inlet / outlet pressure. In the refrigeration system, the hot gas bypass valve can bypass the high-temperature gaseous refrigerant at the high-pressure end to the low-pressure end of the system to ensure that the system always operates at a given minimum return air pressure. The hot gas bypass valve can ensure the low-temperature operation of the refrigeration compressor 14, thereby ensuring that the entire low-temperature refrigeration and dehumidification system can operate at a given minimum return air pressure.

[0034] The input end of the finned condenser 13 is connected and communicated with the rear end (e.g., directly behind) of the finned evaporator 15. The wind passing through the finned evaporator 15 flows and passes through the finned condenser 13. The rear end of the finned condenser 13 is provided with a blower 12. The air inlet of the blower 12 faces the finned condenser 13, and the air outlet faces the end away from the finned condenser 13. The blower 12 is used to discharge the air processed by the finned condenser 13. The output end of the finned condenser 13 is connected and communicated with the input end of the shell and tube condenser 18 through the second pipeline 2. The second pipeline 2 is equipped with a solenoid valve 8, and the solenoid valve 8 is located on the side of the second pipeline 2 close to the shell and tube condenser 18.

[0035] The finned condenser 13 cools and liquefies the air passing through and releases heat to the outside. Figure 1 In the figure, position A is the upwind port, and the air at position A (i.e., the flowing wind) passes through the filter 17 and the electric heater 16 in sequence, and the electric heater 16 preheats the air and does not change the humidity of the air (i.e., the humidity remains unchanged), and then the air enters the finned evaporator 15, and the finned evaporator 15 absorbs heat and cools the air and reduces the humidity, and the air processed by the finned evaporator 15 flows into the finned condenser 13 and is processed, and the finned condenser 13 heats the air and keeps the humidity unchanged, thereby forming dry air, and the dry air can be transported to the rear (e.g., the equipment room) after passing through the blower 12.

[0036] In an optional embodiment, the second pipe 2 is also connected to one end of the communication path close to the shell and tube condenser 18, so that the medium in the second pipe 2 can return to the fin evaporator 15 again through the communication path.

[0037] The second pipeline 2 is a pipeline capable of withstanding a relatively high pressure, at least a pipeline capable of withstanding a greater pressure than the first pipeline 1 .

[0038] Compared with the traditional refrigeration dehumidifier, the utility model can ensure that the water inlet temperature of the shell and tube heat exchanger is above a certain water temperature by installing a heating water tank 19 in front of the shell and tube condenser 18. When the water inlet temperature is low, the heating in the electric water tank is started, so that it can adapt to the low-temperature water source used in the environment. Among them, the proportional integral three-way valve 7 is installed at the inlet and outlet of the shell and tube condenser 18. By detecting the cooling inlet and outlet water temperature data, the proportional integral three-way valve 7 controls and adjusts the water flow of the water entering the shell and tube condenser 18, and the excess water is bypassed to the condensation outlet pipeline to ensure the minimum water flow and ensure that the condensation pressure is within the operating range, so as to adjust the water temperature and water flow of the shell and tube condenser. By installing an electric heater 16 in front of the finned evaporator 15, it is ensured that the air temperature entering the finned evaporator 15 is high, which can effectively improve the dehumidification capacity of the evaporator, improve the air inlet conditions, and increase the dehumidification capacity. By installing a hot gas bypass valve in the bypass pipeline, the low-temperature operation of the system can be guaranteed (the lowest temperature can be as low as 15°C).

[0039] The embodiment disclosed in this specification is only an example of the unilateral features of the utility model, and the protection scope of the utility model is not limited to this embodiment. Any other functionally equivalent embodiments fall within the protection scope of the utility model. For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the utility model.

Claims

1. A low-temperature refrigeration and dehumidification system, characterized in that: It includes a heating water tank, a shell and tube condenser, an electric heater, a finned evaporator, a finned condenser, a refrigeration compressor and a blower. The water inlet end of the heating water tank is connected to the water inlet pipe, the water outlet end of the heating water tank is connected to the refrigerant inlet of the shell and tube condenser, and the output end of the shell and tube condenser is connected to the input end of the finned evaporator. The output end of the finned evaporator is connected to the input end of the refrigeration compressor, and the finned evaporator is located at the downwind outlet of the environment. The output end of the refrigeration compressor is connected to the input end of the finned condenser, and the output end of the refrigeration compressor is connected to the input end of the finned condenser. The input end of the finned condenser is connected to the rear end of the finned evaporator. The rear end of the finned condenser is provided with a blower. The air inlet of the blower faces the finned condenser, and the air outlet faces the end away from the finned condenser.

2. The low-temperature refrigeration and dehumidification system according to claim 1, characterized in that: It also includes a proportional-integral three-way water valve, a first end of the proportional-integral three-way water valve is connected to the refrigerant inlet of the shell and tube condenser, a second end of the proportional-integral three-way water valve is connected to the refrigerant outlet of the shell and tube condenser, and a third end of the proportional-integral three-way water valve is connected to the water outlet pipe.

3. The low-temperature refrigeration and dehumidification system according to claim 2, characterized in that: A temperature sensor and a third pressure sensor are also installed on the water outlet pipe connected to the proportional integral three-way water valve.

4. The low-temperature refrigeration and dehumidification system according to claim 1, characterized in that: A drying filter and a throttling expansion valve are also installed on the communication path between the output end of the shell and tube condenser and the input end of the finned evaporator. A one-way valve is also installed on the communication path. The one-way valve is located on one side of the communication path close to the output end of the shell and tube condenser.

5. The low-temperature refrigeration and dehumidification system according to claim 4, characterized in that: It also includes a filter. The filter and the electric heater are arranged in sequence from the upper air port to the fin-type evaporator. The filter and the electric heater are located between the upper air port and the fin-type evaporator.

6. The low-temperature refrigeration and dehumidification system according to claim 5, characterized in that: The output end of the finned evaporator is connected to the input end of the refrigeration compressor through a first pipeline.

7. The low-temperature refrigeration and dehumidification system according to claim 6, characterized in that: A first pressure sensor is also installed on the first pipeline, and the first pressure sensor is located on a side of the pipeline close to the refrigeration compressor.

8. The low-temperature refrigeration and dehumidification system according to claim 7, characterized in that: The first pipeline is also connected to the output end of the refrigeration compressor through a bypass pipeline, and a hot gas bypass valve is also installed on the bypass pipeline.

9. The low-temperature refrigeration and dehumidification system according to claim 8, characterized in that: The output end of the finned condenser is connected to the input end of the shell and tube condenser through a second pipe. A solenoid valve is installed on the second pipe. The solenoid valve is located on a side of the second pipe close to the shell and tube condenser.

10. The low-temperature refrigeration and dehumidification system according to claim 9, characterized in that: The second pipe is also connected to one end of the communication path close to the shell and tube condenser.

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