阅读说明：本技术 宽温高精度冷液制冷系统 (Wide-temperature high-precision cold liquid refrigerating system ) 是由 柴恒炜 刘益萍 黄卫 于 2021-10-21 设计创作，主要内容包括：本发明公开了一种宽温高精度冷液制冷系统,包括压缩机、冷凝器、冷凝压力调节器、NRD阀、储液器、过滤器、膨胀阀、板式换热器、电子膨胀阀、气液分离器、高低压控制器、温度控制器、轴流风机、压缩机曲柄加热带、储液器加热带、高压表、低压表、针阀、压力传感器、针阀。其中NRD阀通过管路连接在冷凝器与冷凝压力调节器之间。电子膨胀阀通过管路连接在冷凝器与膨胀阀之间。压缩机出口分一路进入高压压力表。气液分离器进口分一路进入低压压力表。过滤器出口分一路进入第一针阀,板式换热器出口分一路进入第二针阀。压缩机曲柄加热带缠绕在压缩机上。储液器加热带缠绕在储液器上。本发明能够实现对供液温度的精确控制和宽温制冷工作。(The invention discloses a wide-temperature high-precision cold liquid refrigerating system which comprises a compressor, a condenser, a condensation pressure regulator, an NRD valve, a liquid storage device, a filter, an expansion valve, a plate type heat exchanger, an electronic expansion valve, a gas-liquid separator, a high-low pressure controller, a temperature controller, an axial flow fan, a compressor crank heating belt, a liquid storage device heating belt, a high pressure meter, a low pressure meter, a needle valve, a pressure sensor and a needle valve. Wherein the NRD valve is connected between the condenser and the condensing pressure regulator by a pipeline. The electronic expansion valve is connected between the condenser and the expansion valve through a pipeline. The outlet of the compressor enters a high-pressure gauge in one path. The inlet of the gas-liquid separator is divided into one path to enter a low-pressure gauge. The outlet of the filter enters a first needle valve in one way, and the outlet of the plate heat exchanger enters a second needle valve in one way. The compressor crank heating belt is wound on the compressor. The reservoir heating tape is wound on the reservoir. The invention can realize the precise control of the liquid supply temperature and the wide-temperature refrigeration work.)

1. The wide-temperature high-precision cold liquid refrigeration system comprises a compressor (1), a condenser (2), a liquid storage device (5), a filter (6), an expansion valve (7), a plate type heat exchanger (8) and a gas-liquid separator (10), wherein the outlet end of the compressor (1) is connected with the inlet end of the condenser (2) through a pipeline, the condenser (2) is provided with an axial flow fan (13), the outlet end of the condenser (2) is connected with the inlet end of the liquid storage device (5) through a pipeline, the outlet end of the liquid storage device (5) is connected with the inlet end of the filter (6) through a pipeline, the outlet end of the filter (6) is connected with the inlet end of the expansion valve (7) through a pipeline, the outlet end of the expansion valve (7) is connected with the inlet end of the plate type heat exchanger (8) through a pipeline, the outlet end of the plate type heat exchanger (8) is connected with the inlet end of the compressor (1) through a pipeline, and a refrigerant circulation loop is formed, the method is characterized in that: a condensing pressure regulator (3) is communicated and connected with a pipeline between the outlet end of the condenser (2) and the inlet end of the liquid reservoir (5); a bypass pipeline led out from the inlet end of the condenser (2) is connected with the inlet end of an electronic expansion valve (9), and the outlet end of the electronic expansion valve (9) is connected with a bypass at the inlet end of the plate heat exchanger (8) through a pipeline; a bypass pipeline is led out from the inlet end of the condenser (2) and connected with the inlet end of an NRD valve (4), and the outlet end of the NRD valve (4) is connected with a pipeline between the condensing pressure regulator (3) and the liquid reservoir (5) through a pipeline bypass; and a pressure sensor (19) is connected and installed between the outlet end of the filter (6) and the inlet end of the expansion valve (7) through a pipeline bypass, and the rotating speed of the axial flow fan (13) is controlled based on the measured data feedback of the pressure sensor (19).

2. The wide temperature high precision cold liquid refrigeration system according to claim 1, characterized in that: the compressor is characterized in that a compressor crank heating belt (14) is wound on the compressor (1), a liquid storage device heating belt (15) is wound on the liquid storage device (5), the compressor is characterized by further comprising a temperature controller (12), a temperature sensing probe of the temperature controller (12) is in contact with the liquid storage device (5), and the temperature controller (12) is respectively in control connection with the compressor crank heating belt (14) and the liquid storage device heating belt (15).

3. The wide temperature high precision cold liquid refrigeration system according to claim 1, characterized in that: the compressor (1) outlet end is connected with a high-pressure gauge (16) through a bypass, the gas-liquid separator (17) inlet end is connected with a low-pressure gauge (17) through a bypass, and a high-low pressure controller (11) is connected between the compressor (1) outlet end and the gas-liquid separator (17) inlet end through a pipeline.

4. The wide temperature high precision cold liquid refrigeration system according to claim 1, characterized in that: a first needle valve (18) is connected and installed between the outlet end of the filter (6) and the inlet end of the expansion valve (7) through a pipeline bypass, and a pressure sensor (19) is integrally installed on the first needle valve (18).

5. The wide temperature high precision cold liquid refrigeration system according to claim 1, characterized in that: and a second needle valve (20) is further connected to the outlet end of the plate heat exchanger (8) in a bypass manner.

6. The wide temperature high precision cold liquid refrigeration system according to claim 1, characterized in that: the axial flow fan (13) is a stepless speed regulation axial flow fan.

Technical Field

The invention relates to the field of cold liquid refrigeration systems, in particular to a wide-temperature high-precision cold liquid refrigeration system.

Background

The liquid cooling refrigeration system matched with the special industry is required to normally work at the ambient temperature (-45-55 ℃), the precision of the liquid supply temperature of the refrigeration device by the load is required to be +/-0.3 ℃, and the load has the change of the start-stop state. Because the liquid supply unit of the liquid cooling refrigeration system matched with the existing special industry needs to refrigerate under the condition of very low environmental temperature, most of the liquid supply units adopt air cooling condensate water to realize the refrigeration under the condition of low temperature, the refrigeration needs to be partially connected with an air cooling radiator in parallel at a condenser, and the mode has the defects of difficulty in accurate temperature control, small refrigeration working temperature range, large required radiator, large air quantity of a fan, more pipeline joints, weight increase, high refrigeration cost, system service life reduction, reliability reduction and the like for the system with large heat dissipation capacity; in addition, the split type liquid cooling unit is more complex to manufacture by adopting air condensation water and has lower reliability.

Disclosure of Invention

The invention aims to provide a wide-temperature high-precision liquid cooling refrigeration system, which solves the problems that the liquid cooling refrigeration system matched with the special industry in the prior art is difficult to realize wide-range high-low temperature refrigeration, accurate temperature control and poor reliability.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the wide-temperature high-precision cold liquid refrigeration system comprises a compressor (1), a condenser (2), a liquid storage device (5), a filter (6), an expansion valve (7), a plate type heat exchanger (8) and a gas-liquid separator (10), wherein the outlet end of the compressor (1) is connected with the inlet end of the condenser (2) through a pipeline, the condenser (2) is provided with an axial flow fan (13), the outlet end of the condenser (2) is connected with the inlet end of the liquid storage device (5) through a pipeline, the outlet end of the liquid storage device (5) is connected with the inlet end of the filter (6) through a pipeline, the outlet end of the filter (6) is connected with the inlet end of the expansion valve (7) through a pipeline, the outlet end of the expansion valve (7) is connected with the inlet end of the plate type heat exchanger (8) through a pipeline, the outlet end of the plate type heat exchanger (8) is connected with the inlet end of the compressor (1) through a pipeline, and a refrigerant circulation loop is formed, a condensing pressure regulator (3) is communicated and connected with a pipeline between the outlet end of the condenser (2) and the inlet end of the liquid reservoir (5); a bypass pipeline led out from the inlet end of the condenser (2) is connected with the inlet end of an electronic expansion valve (9), and the outlet end of the electronic expansion valve (9) is connected with a bypass at the inlet end of the plate heat exchanger (8) through a pipeline; a bypass pipeline is led out from the inlet end of the condenser (2) and connected with the inlet end of an NRD valve (4), and the outlet end of the NRD valve (4) is connected with a pipeline between the condensing pressure regulator (3) and the liquid reservoir (5) through a pipeline bypass; and a pressure sensor (19) is connected and installed between the outlet end of the filter (6) and the inlet end of the expansion valve (7) through a pipeline bypass, and the rotating speed of the axial flow fan (13) is controlled based on the measured data feedback of the pressure sensor (19).

Further, the winding has compressor crank heating area (14) on compressor (1), the winding has reservoir heating area (15) on reservoir (5), still includes temperature controller (12), the temperature sensing probe and the contact of reservoir (5) of temperature controller (12), temperature controller (12) respectively with compressor crank heating area (14), reservoir heating area (15) control connection.

Further, the outlet end of the compressor (1) is connected with a high-pressure gauge (16) in a bypass mode, the inlet end of the gas-liquid separator (17) is connected with a low-pressure gauge (17) in a bypass mode, and a high-low pressure controller (11) is connected between the outlet end of the compressor (1) and the inlet end of the gas-liquid separator (17) through a pipeline.

Furthermore, a first needle valve (18) is connected and installed between the outlet end of the filter (6) and the inlet end of the expansion valve (7) in a bypass mode, and the pressure sensor (19) is integrally installed on the first needle valve (18).

Furthermore, a second needle valve (20) is connected to the outlet end of the plate heat exchanger (8) in a bypass mode.

Further, the axial flow fan (13) is a stepless speed regulation axial flow fan.

The electronic expansion valve (9) is arranged between the inlet of the condenser (2) and the outlet of the expansion valve (7) and is used as a regulating device of the bypass flux of hot gas, the difference value and the variation trend of the actual liquid supply temperature and the set temperature are used as judgment bases, and the liquid supply temperature is accurately controlled by adopting an intelligent control means.

The invention is additionally provided with a condensing pressure regulator (3) at the outlet of a condenser (2), one path of the outlet of the condensing pressure regulator (3) enters a liquid storage device, and the other path of the outlet is communicated to pipelines in a compressor and the condenser through an NRD valve (4), thereby realizing low-temperature refrigeration.

The invention is characterized in that a high-pressure gauge (16) is additionally arranged on one path of an outlet of a compressor (1) through a pipeline, a low-pressure gauge (17) is additionally arranged on one path of an inlet of a gas-liquid separator (10) through a pipeline, and a high-pressure and low-pressure controller (11) is additionally arranged between the outlet of the compressor (1) and the inlet of the gas-liquid separator (10). The refrigeration system is protected by controlling the high pressure and the low pressure of the refrigeration system.

According to the invention, the outlet of the filter (6) is divided into two paths to enter the first needle valve (18) through a pipeline, and the pressure sensor (19) is fixed on the first needle valve (18), so that the pressure sensor (19) is convenient to maintain and repair. An outlet of the plate heat exchanger (8) is divided into two paths to enter the second needle valve (20) through a pipeline, so that the system can be conveniently filled with refrigerant.

The axial flow fan (13) is a stepless speed regulating fan, and the change of the condensing pressure is convenient to adjust.

According to the invention, the compressor crank heating belt (14) is additionally arranged on the compressor (1), the liquid storage device heating belt (15) is additionally arranged on the liquid storage device (5), and the temperature sensing head of the temperature controller (12) is wrapped on the liquid storage device (5), so that the working reliability of the compressor (1) is improved during low-temperature refrigeration.

Compared with the prior art, the invention has the advantages that:

1) can realize the accurate control of the temperature of the liquid supply

2) The wide-temperature refrigeration work can be realized.

3) Simple structure, convenient to use, easy maintenance fills and annotates the refrigerant convenience, and the reliability is high.

Drawings

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

Fig. 2 is a graph of the feedback control of the pressure sensor of the present invention.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

As shown in fig. 1, the wide-temperature high-precision refrigeration system of the present invention includes a compressor 1, a condenser 2, a condensing pressure regulator 3, an NRD valve 4, a liquid reservoir 5, a filter 6, an expansion valve 7, a plate heat exchanger 8, an electronic expansion valve 9, a gas-liquid separator 10, a high-low pressure controller 11, a temperature controller 12, an axial flow fan 13, a compressor crank heating belt 14, a liquid reservoir heating belt 15, a high pressure gauge 16, a low pressure gauge 17, a needle valve 18, a pressure sensor 19, and a needle valve 20.

The compressor 1, the condenser 2, the condensing pressure regulator 3, the liquid storage device 5, the filter 6, the expansion valve 7, the plate heat exchanger 8 and the gas-liquid separator 10 are sequentially connected through pipelines to form a refrigerant circulation loop. The condenser 2 is provided with an axial flow fan 13, the outlet end of the condenser 2 is connected with the inlet end of a condensation pressure regulator 3 through a pipeline, the outlet end of the condensation pressure regulator 3 is connected with the inlet end of a liquid storage device 5 through a pipeline, the outlet end of the liquid storage device 5 is connected with the inlet end of a filter 6 through a pipeline, the outlet end of the filter 6 is connected with the inlet end of an expansion valve 7 through a pipeline, the outlet end of the expansion valve 7 is connected with the inlet end of a plate heat exchanger 8 through a pipeline, and the outlet end of the plate heat exchanger 8 is connected with the inlet end of the compressor 1 through a pipeline.

The NRD valve 4 is connected between the inlet end of the condenser 2 and the outlet end of the condensing pressure regulator 3 through a pipe. The electronic expansion valve 9 is connected between the inlet end of the condenser 2 and the outlet end of the expansion valve 7 through a pipeline. The outlet end of the compressor 1 is branched into a high pressure gauge 16 through a pipeline. The inlet end of the gas-liquid separator 10 is divided into two paths and enters a low-pressure gauge 17 through a pipeline. The filter 6 outlet branches through a line into a first needle valve 18. The outlet of the plate heat exchanger 8 branches into a second needle valve 20 through a pipeline. The pressure sensor 19 is connected integrally to the first needle valve 18. The high-low pressure controller 11 is connected with the outlet end of the compressor 1 and the inlet end of the gas-liquid separator 10 through pipelines. A compressor crank heating belt 14 is wound around the compressor 1. Reservoir heating tape 15 is wound around reservoir 5. The temperature controller 12 is wrapped on the liquid storage device 5, and the temperature controller 12 is respectively connected with the compressor crank heating belt 14 and the liquid storage device heating belt 15 in a control mode. The axial fan 13 disposed in the condenser 2 discharges the heat load of the condenser 2 to the outside space.

The working process of the refrigeration system is as follows: compressor 1 → condenser 2 → condensing pressure regulator 3 → accumulator 5 → filter 6 → expansion valve 7 → plate heat exchanger 8 → gas-liquid separator 10 → compressor 1. The high-temperature refrigerant exchanges heat with air circulating in the condenser 2 through the condenser 2, and is then discharged into the surrounding atmosphere through the axial flow fan 13 to cool the refrigerant, and the low-temperature refrigerant exchanges heat through the plate heat exchanger 8 to cool the coolant.

In the invention, the working modes are as follows:

1) during refrigeration, except for completing the working process of the refrigeration system, an electronic expansion valve 9 is arranged between an exhaust pipeline of a compressor 1 and a pipeline entering a plate heat exchanger 8 and used as a regulating device of hot gas bypass quantity, the hot gas bypass is that part of high-temperature and high-pressure gas exhausted by the compressor 1 is directly sent to an inlet of the plate heat exchanger 8 without being condensed by a condenser 2 and is mixed with a low-temperature and low-pressure refrigerant (which is equivalent to providing a heat load except an actual load for the plate heat exchanger 8) throttled by an expansion valve 7 for improving evaporation temperature and return gas temperature and regulating in real time to stabilize liquid supply temperature. Taking the difference value between the actual liquid supply temperature and the set temperature and the variation trend thereof as judgment basis, when the liquid supply temperature is detected to be higher than the set temperature, the electronic expansion valve 9 is completely closed, and at the moment, no bypass quantity is completely used for refrigeration; when the liquid supply temperature is lower than the set temperature, the electronic expansion valve 9 is opened to enable a part of high-temperature and high-pressure gas to enter the plate heat exchanger 8, so that the internal temperature of the plate heat exchanger 8 is increased, and the liquid supply temperature is further increased; and taking the difference between the liquid supply temperature and the set temperature and the change trend of the difference as judgment basis, adjusting the opening degree of the bypass electronic expansion valve 9 in real time, further adjusting the bypass quantity in real time, and finally realizing the accurate control of the liquid supply temperature.

2) When the refrigeration system is used for low-temperature refrigeration, except for finishing the working flow of the refrigeration system, the compressor 1 enters the NRD valve 4 in one way, a refrigerant coming out of the NRD valve 4 and a refrigerant coming out of the condensation pressure regulator 3 are mixed and then enter the liquid storage device 5, the opening amount of the condensation pressure regulator 3 is controlled by the external environment temperature, when the environment temperature is lower, more refrigerants enter the NRD valve 4, the high-low pressure difference of the refrigeration system is maintained, and the refrigeration is realized. When the ambient temperature is low, the speed of the axial flow fan 13 needs to be regulated, and the condensing pressure is fed back by the pressure sensor 19 to control the rotating speed of the axial flow fan 13, for example, the control curve can be as shown in fig. 2, when the condensing pressure is greater than 16bar, the axial flow fan 13 is operated at the highest speed; when the condensing pressure is less than 10bar, the axial flow fan 13 does not rotate; when the condensing pressure is less than 10bar to 16bar, the rotating speed of the axial flow fan 13 rises according to a curve of a pressing graph, the condensing pressure of the refrigerating system is maintained, ultralow-temperature refrigeration is realized, and other control curves can be set according to an actual control target.

3) During low-temperature refrigeration, except finishing the working process of the low-temperature refrigeration 2), the compressor crank heating belt 14 is wound on the compressor 1, the liquid storage device heating belt 15 is wound on the liquid storage device 5, and the work of the compressor crank heating belt 14 and the liquid storage device heating belt 15 is controlled through the temperature controller 12. The compressor crank heating belt 14 and the accumulator heating belt 15 do not operate when the refrigerant temperature is high. When the refrigerant temperature is low, the compressor crank heating belt 14 and the accumulator heating belt 15 operate. Thereby preventing damage to the compressor when the refrigerant is low.

4) During high-low pressure control, except finishing the work flow of the refrigerating system 1), in addition, a high-low pressure controller 11 is connected to an outlet of the compressor 1 and an inlet of the gas-liquid separator 10 through pipelines, and when a high-pressure gauge 16 displays high pressure or a low-pressure gauge 17 displays low pressure, the high-low pressure controller 11 controls the work of the compressor 1 and the axial flow fan 13 in the refrigerating system.

5) The needle valve is installed, except for finishing the work flow of the refrigerating system 1), the outlet of the filter 6 is divided into a plurality of paths to enter the first needle valve 18 through a pipeline, the pressure sensor 19 is fixed on the first needle valve 18, the installation of the first needle valve 18 is beneficial to the maintenance of the pressure sensor 19, and the outlet of the plate heat exchanger 8 is divided into a plurality of paths to enter the second needle valve 20 through a pipeline. The installation of the second needle valve 20 facilitates system priming.

The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.