CN111970911A - Constant temperature dehumidification refrigerating plant - Google Patents

Abstract

The invention discloses a constant temperature dehumidification refrigeration device, comprising a compressor, a condenser, a reversing valve, a one-way valve, an expansion valve, a second one-way valve, a third one-way valve, an evaporator, a heat exchanger, a temperature sensor, Outdoor unit fan, indoor unit fan, the output end of the compressor is connected to the input end of the condenser, and its input end is connected to the output end of the evaporator and the port S of the reversing valve, and the outside of the condenser The outdoor unit fan is provided, and its output end is connected to the port D of the reversing valve, the input end of the one-way valve 1 is connected to the port C of the reversing valve, and the output end is connected to the expansion valve. The input end and the three output ends of the one-way valve are connected. The equipment is simplified, the number of expansion valves is reduced, and the technical effect of simple and low-cost constant temperature dehumidification can be achieved on the basis of conventional refrigeration and dehumidification functions.

Description

A constant temperature dehumidification refrigeration device

technical field

The invention relates to the field of constant temperature dehumidification and refrigeration devices, in particular to a constant temperature dehumidification and refrigeration device.

Background technique

The air conditioning system is used in various occasions. The following describes the air conditioning system used in the computer room, data center and other occasions.

With the rapid development of big data, computer room air conditioners have also entered an era of rapid development and response. There are a wide variety of electronic devices in the computer room. To improve the stability and reliability of the use of these devices, it is necessary to strictly control the temperature and humidity parameters of the environment within the specified range. The early computer room air conditioners used comfort air conditioners, which often caused unstable operation of equipment room equipment due to improper ambient temperature, and problems such as static electricity and condensation. The computer room precision air conditioner is a special air conditioner designed for the current computer room. Its temperature and humidity control accuracy and reliability are much higher than that of ordinary air conditioners.

The temperature adjustment of the traditional precision air conditioning system mainly relies on the compressor refrigeration system to remove the heat load in the machine room, and auxiliary electric heating for temperature control. Humidity adjustment is mainly adjusted through two parts. When the humidity is higher than the target humidity, by adjusting the refrigeration system, when the air flows through the surface of the evaporator, the temperature is lower than the dew point temperature of the air, and the water vapor in the air will liquefy, thereby reducing the air When the humidity is lower than the target humidity, the humidifier will be turned on for humidification to ensure that the humidity is within the target humidity range.

The speed of the traditional precision air conditioner compressor is adjusted according to the temperature of the indoor unit or the load calculated by the temperature as the target value. The output is also larger; on the contrary, when the temperature is lower, the compressor speed is lower. At this time, the circulating amount of refrigerant in the system is also smaller, and the cooling output is smaller. In the whole air conditioning system, because the compressor has a minimum frequency limit, the cooling capacity output cannot be 0, which is generally about 20% to 30% of the maximum cooling capacity of the compressor. Therefore, the precision air conditioner has a minimum cooling capacity. When the heat load of the precision air conditioner is lower than the minimum cooling capacity, the compressor will stop. Generally, the air conditioning system will set a minimum operation time and shutdown time to protect the compressor from frequent start and stop and damage. , the temperature of the computer room will rise during the shutdown time, and the temperature of the computer room will drop during the startup time, and the temperature will fluctuate violently. At this time, if the equipment room needs to be dehumidified, because the compressor runs for a short time and the dehumidification capacity is very limited, the humidity of the equipment room cannot be controlled at this time. In this regard, traditional precision air conditioner manufacturers generally use electric heating for thermal compensation. After using electric heating, the compressor running time can be increased and the dehumidification capacity can be increased. However, the added several kilowatts of motor heat will not heat the air uniformly, and additional air conditioning equipment will be required. Electric capacity, increasing electric heating is not the most economical form.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a constant temperature dehumidification and refrigeration device.

According to the technical solutions provided in the embodiments of the present application, a constant temperature dehumidification refrigeration device includes a compressor, a condenser, a reversing valve, a check valve, an expansion valve, a second check valve, a third check valve, an evaporator, a Heater, temperature sensor, outdoor unit fan, evaporator, indoor unit fan, the output end of the compressor is connected to the input end of the condenser, and its input end is connected to the output end of the evaporator, the condenser The outdoor unit fan is provided outside the device, and its output end is connected to the port D of the reversing valve, the input end of the one-way valve 1 is connected to the port C of the reversing valve, and the output end is connected to the The input end of the expansion valve and the third output end of the one-way valve are connected, the input end of the expansion valve is provided with the temperature sensor, and the output end of the expansion valve is connected to the input end of the evaporator and the second one-way valve, The output end of the evaporator is connected to the input end of the compressor and the port S of the reversing valve, one end of the heat exchanger is connected to the output end of the second one-way valve, and the other end is connected to the Port E of the reversing valve, an evaporator and a heat exchanger are arranged inside the evaporator, and an indoor unit fan is arranged on the outer surface of the evaporator.

In the present invention, the reversing valve includes a port D, a port C, a port S, and a port E, the port D and the port C are connected during cooling, the port S and the port E are connected, and the port D and the port E are connected during switching, Port C and port S are turned on.

In the present invention, the number of the expansion valve is only one, and its model is one of an electronic expansion valve and a thermal expansion valve.

In the present invention, the evaporator and the heat exchanger are one of a series structure and a parallel structure on the air path side. When connected in series, the indoor air first passes through the evaporator and then passes through the heat exchanger. When connected in parallel, the indoor air passes through the evaporator respectively. and the heat exchanger.

During cooling, the speed of the outdoor fan is controlled according to the value of the temperature sensor; the gas-liquid ratio of the refrigerant at the output end of the condenser is changed according to the speed.

When the system uses a variable frequency compressor for cooling, the speed of the compressor is controlled according to the temperature of the output air of the heat exchanger; when the system uses a fixed-frequency compressor for cooling, the speed of the outdoor fan is controlled according to the temperature of the output air of the heat exchanger; according to the compressor The suction pressure assists in controlling the compressor speed and limits the compressor frequency operating range when the suction pressure is too low or too high.

During refrigeration, the evaporator and heat exchanger are connected in parallel on the refrigerant side, and the evaporator and heat exchanger are connected in series on the refrigerant side during low-load operation or dehumidification operation; The reversing of the three-way valve and the reversing valve achieves the parallel and series conversion of the heat exchanger and the evaporator. Compared with the previous two cases, it is a series structure, which reduces the system resistance.

Compared with the prior art that uses two expansion valves, the use of a single expansion valve reduces the number of expansion valves on the one hand, and on the other hand, the expansion valve and the heat exchanger adopt a series structure, which not only reduces the resistance loss of the heat exchanger, but also reduces the number of expansion valves. During the mode switching process, the impact on the expansion valve is avoided, and the use of the expansion valve is no longer limited to the electronic expansion valve, and other expansion valve components such as thermal expansion valve can be used.

To sum up, the beneficial effects of the present application: simplify equipment, reduce the number of expansion valves, and achieve the technical effect of simple and low-cost constant temperature dehumidification on the basis of conventional refrigeration and dehumidification functions.

Description of drawings

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

FIG. 1 is a schematic structural diagram of the present invention.

Labels in the figure: compressor-1, condenser-2, reversing valve-3, one-way valve-4, expansion valve-5, one-way valve two-6, one-way valve three-7, evaporator-8 , heat exchanger -9, temperature sensor -10, outdoor unit fan -11, indoor unit fan -13.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the related invention, but not to limit the invention. In addition, it should be noted that, for the convenience of description, only the parts related to the invention are shown in the drawings.

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figure 1, a constant temperature dehumidification refrigeration device includes a compressor 1, a condenser 2, a reversing valve 3, a check valve 1 4, an expansion valve 5, a check valve 2 6, a check valve 3 7, an evaporation valve 8, heat exchanger 9, temperature sensor 10, outdoor unit fan 11, indoor unit fan 13, the output end of the compressor 1 is connected to the input end of the condenser 2, and its input end is connected to the evaporator The output end of the condenser 8, the outdoor unit fan 11 is provided outside the condenser 2, and its output end is connected to the port D of the reversing valve 3, and the input end of the one-way valve 4 is connected to the The port C of the reversing valve 3 is connected, and the output end is connected to the input end of the expansion valve 5 and the output end of the one-way valve 37. The input end of the expansion valve 5 is provided with the temperature sensor 10, and its output The end is connected to the input end of the evaporator 8 and the one-way valve 2 6, the output end of the evaporator 8 is connected to the input end of the compressor 1 and the port S of the reversing valve 3, so One end of the heat exchanger 9 is connected to the output end of the one-way valve 2 6, and the other end is connected to the port E of the reversing valve 3. An indoor unit fan 13 is provided on the outer surface of the heat exchanger 9.

The reversing valve 3 includes port D, port C, port S, and port E. During cooling, port D and port C are connected, and port S and E are connected. When switching, port D and port E are connected. Port S is turned on. The number of the expansion valve 5 is only one, and its model is one of an electronic expansion valve and a thermal expansion valve. The evaporator 8 and the heat exchanger 9 are one of a series structure and a parallel structure. When the constant temperature dehumidification refrigeration device is refrigerating, the port D of the reversing valve 3 is connected to the port C, and the port S of the reversing valve 3 is connected to the port E, so that the liquid output from the condenser 2 is refrigerated. The agent enters through the port D of the reversing valve 3, flows to the single-phase valve 4 through the port C, and then is throttled and depressurized by the expansion valve 5 and divided into two paths, one is delivered to the evaporator 8, and the other is passed through the one-way valve. 6 is sent to the heat exchanger 9, the refrigerant evaporates in the evaporator 8 and the heat exchanger 9 and exchanges heat with the indoor unit air to cool the indoor air.

When the constant temperature dehumidification refrigeration device is in constant temperature dehumidification operation, the port D of the reversing valve 3 is connected to the port E, and the port S of the reversing valve 3 is connected to the port C, so that the liquid output of the condenser 2 is connected. Or the gas-liquid two-phase refrigerant enters through the port D of the reversing valve 3, and is transported to the heat exchanger 9 through the port E, and is output from the heat exchanger 9 to the one-way valve 7 after the heat exchanger 9 is cooled or condensed At the input end, the check valve 6 is closed due to the pressure difference, the output end of the check valve 7 is connected to the input end of the expansion valve 5, the check valve 4 is closed due to the pressure difference, and the refrigerant is throttled and depressurized by the expansion valve 5 and then enters the evaporation. Evaporates in the evaporator 8 and exchanges heat with the air of the indoor unit. The indoor air is first cooled and dehumidified by the evaporator 8, and then heated by the heat exchanger 9.

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principles and other solutions. At the same time, the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, and should also include the above-mentioned technical features or their equivalents without departing from the concept of the invention. Other technical solutions formed by any combination. For example, a technical solution is formed by replacing the above-mentioned features with the technical features disclosed in this application (but not limited to) with similar functions.

Claims (4)

1. The utility model provides a constant temperature dehumidification refrigerating plant, includes compressor (1), condenser (2), switching-over valve (3), check valve (4), expansion valve (5), check valve two (6), check valve three (7), evaporimeter (8), heat exchanger (9), temperature sensor (10), off-premises station fan (11), indoor set fan (13), characterized by: the output end of the compressor (1) is connected with the input end of the condenser (2), the input end of the compressor is connected with the output end of the evaporator (8) and the port S of the reversing valve (3), the outdoor unit fan (11) is arranged outside the condenser (2), the output end of the condenser is connected with the port D of the reversing valve (3), the input end of the one-way valve I (4) is connected with the port C of the reversing valve (3), the output end of the one-way valve I is connected with the input end of the expansion valve (5) and the output end of the one-way valve III (7), the input end of the expansion valve (5) is provided with the temperature sensor (10), the output end of the expansion valve I is connected with the input ends of the evaporator (8) and the one-way valve II (6), the output end of the evaporator (8) is connected with the input end of the compressor (1) and the port S of, one end of the heat exchanger (9) is connected with the output end of the check valve II (6), the other end of the heat exchanger is connected with the port E of the reversing valve (3), and an indoor unit fan (13) is arranged on the outer surface of the heat exchanger (9).

2. A thermostatic dehumidifying and refrigerating device as claimed in claim 1, wherein: the reversing valve (3) comprises a port D, a port C, a port S and a port E, the port D is communicated with the port C in normal, the port S is communicated with the port E, the port D is communicated with the port E in switching, and the port C is communicated with the port S.

3. A thermostatic dehumidifying and refrigerating device as claimed in claim 1, wherein: the number of the expansion valve (5) is only one, and the type of the expansion valve is one of an electronic expansion valve and a thermal expansion valve.

4. A thermostatic dehumidifying and refrigerating device as claimed in claim 1, wherein: the evaporator (8) and the heat exchanger (9) are in one of a series structure and a parallel structure on the wind path side.

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