阅读说明：本技术 宽温高精度制冷装置 (Wide-temperature high-precision refrigerating device ) 是由 刘益萍 谢润之 霍亚东 许奎奎 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种宽温高精度制冷装置,包括压缩机、配置有轴流风机的冷凝器、冷凝压力调节器、NRD阀、储液器、过滤器、膨胀阀、板式换热器、电磁阀、毛细管、气液分离器、电子膨胀阀,其中压缩机、冷凝器、冷凝压力调节器、储液器、过滤器、膨胀阀、板式换热器、气液分离器构成制冷循环回路；NRD阀连通冷凝压力调节器、储液器之间管路和压缩机、冷凝器之间管路；电磁阀一端连通至过滤器、膨胀阀之间管路,另一端通过毛细管与气液分离连接；电子膨胀阀连通膨胀阀、板式换热器之间管路和压缩机、冷凝器之间管路。本发明可实现对供液温度的精确控制及宽温制冷工作。(The invention discloses a wide-temperature high-precision refrigerating device which comprises a compressor, a condenser provided with an axial flow fan, a condensation pressure regulator, an NRD valve, a liquid storage device, a filter, an expansion valve, a plate type heat exchanger, an electromagnetic valve, a capillary tube, a gas-liquid separator and an electronic expansion valve, wherein the compressor, the condenser, the condensation pressure regulator, the liquid storage device, the filter, the expansion valve, the plate type heat exchanger and the gas-liquid separator form a refrigerating circulation loop; the NRD valve is communicated with a pipeline between the condensing pressure regulator and the liquid storage device and a pipeline between the compressor and the condenser; one end of the electromagnetic valve is communicated to a pipeline between the filter and the expansion valve, and the other end of the electromagnetic valve is connected with gas-liquid separation through a capillary tube; the electronic expansion valve is communicated with the expansion valve and the pipeline between the plate heat exchangers and the pipeline between the compressor and the condenser. The invention can realize the precise control of the liquid supply temperature and the wide-temperature refrigeration work.)

1. Wide temperature high accuracy refrigerating plant which characterized in that: the condenser comprises a compressor, a condenser provided with an axial flow fan, a condensation pressure regulator, an NRD valve, a liquid storage device, a filter, an expansion valve, a plate heat exchanger, an electromagnetic valve, a capillary tube, a gas-liquid separator and an electronic expansion valve, wherein the refrigerant outlet end of the compressor is connected with the inlet end of the condenser through a pipeline, the outlet end of the condenser is connected with the inlet end of the condensation pressure regulator through a pipeline, the outlet end of the condensation pressure regulator is communicated with the inside of the liquid storage device through a pipeline, the inlet end of the filter is communicated with the inside of the liquid storage device through a pipeline, the outlet end of the filter is connected with one end of the expansion valve through a pipeline, the other end of the expansion valve is connected with the refrigerant inlet end of the plate heat exchanger through a, thereby forming a refrigeration cycle circuit, and discharging the heat load of the condenser to the external space by an axial flow fan configured for the condenser;

one end of the NRD valve is communicated to a pipeline between the condensing pressure regulator and the liquid storage device through a pipeline bypass, and the other end of the NRD valve is communicated to a pipeline between the compressor and the condenser through a pipeline bypass;

one end of the electromagnetic valve is communicated to a pipeline between the filter and the expansion valve through a pipeline bypass, the other end of the electromagnetic valve is connected with one end of the capillary tube through a pipeline, and the other end of the capillary tube is connected with the inlet end of the gas-liquid separator through a pipeline;

one end of the electronic expansion valve is communicated to a pipeline between the expansion valve and the plate heat exchanger through a pipeline bypass, and the other end of the electronic expansion valve is communicated to a pipeline between the compressor and the condenser through a pipeline bypass.

2. The wide temperature high precision refrigeration unit of claim 1, wherein: and a low-pressure protector is communicated and installed between the gas-liquid separator and the compressor through a pipeline.

3. The wide temperature high precision refrigeration unit of claim 1, wherein: the electronic expansion valve is controlled by PID.

4. The wide temperature high precision refrigeration unit of claim 1, wherein: the condenser cools the refrigerant by adopting air forced convection.

5. The wide temperature high precision refrigeration unit of claim 1, wherein: and after heat exchange is carried out through the plate heat exchanger, cooling the cooling liquid.

Technical Field

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

Background

The refrigeration device 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 start-stop states.

The refrigeration device matched with the special industry needs refrigeration under the condition of low environmental temperature, most of the existing liquid supply units are realized by air-cooled condensate water under the condition of low temperature, and the refrigeration needs to be realized by connecting an air-cooled radiator in parallel with a condenser part; in addition, the split type liquid cooling unit is more complex to manufacture by adopting air condensation water and has lower reliability.

Under the condition of high environmental temperature, the high temperature of a compressor can be protected during refrigeration operation or hot gas bypass, and the refrigeration work is abnormal.

The invention aims to provide a wide-temperature high-precision refrigerating device to solve the problems of poor high-low temperature refrigerating effect and inaccurate temperature control of the refrigerating device in the prior art.

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

wide temperature high accuracy refrigerating plant which characterized in that: the condenser comprises a compressor, a condenser provided with an axial flow fan, a condensation pressure regulator, an NRD valve, a liquid storage device, a filter, an expansion valve, a plate heat exchanger, an electromagnetic valve, a capillary tube, a gas-liquid separator and an electronic expansion valve, wherein the refrigerant outlet end of the compressor is connected with the inlet end of the condenser through a pipeline, the outlet end of the condenser is connected with the inlet end of the condensation pressure regulator through a pipeline, the outlet end of the condensation pressure regulator is communicated with the inside of the liquid storage device through a pipeline, the inlet end of the filter is communicated with the inside of the liquid storage device through a pipeline, the outlet end of the filter is connected with one end of the expansion valve through a pipeline, the other end of the expansion valve is connected with the refrigerant inlet end of the plate heat exchanger through a, thereby forming a refrigeration cycle circuit, and discharging the heat load of the condenser to the external space by an axial flow fan configured for the condenser;

one end of the NRD valve is communicated to a pipeline between the condensing pressure regulator and the liquid storage device through a pipeline bypass, and the other end of the NRD valve is communicated to a pipeline between the compressor and the condenser through a pipeline bypass;

one end of the electromagnetic valve is communicated to a pipeline between the filter and the expansion valve through a pipeline bypass, the other end of the electromagnetic valve is connected with one end of the capillary tube through a pipeline, and the other end of the capillary tube is connected with the inlet end of the gas-liquid separator through a pipeline;

one end of the electronic expansion valve is communicated to a pipeline between the expansion valve and the plate heat exchanger through a pipeline bypass, and the other end of the electronic expansion valve is communicated to a pipeline between the compressor and the condenser through a pipeline bypass.

The wide-temperature high-precision refrigerating device is characterized in that: and a low-pressure protector is communicated and installed between the gas-liquid separator and the compressor through a pipeline.

The wide-temperature high-precision refrigerating device is characterized in that: the electronic expansion valve is controlled by PID.

The wide-temperature high-precision refrigerating device is characterized in that: the condenser cools the refrigerant by adopting air forced convection.

The wide-temperature high-precision refrigerating device is characterized in that: and after heat exchange is carried out through the plate heat exchanger, cooling the cooling liquid.

The invention sets up the electronic expansion valve between compressor and plate heat exchanger, as the regulating device of the by-pass flux of hot gas, regard difference and its trend of change of the actual feed liquid temperature and presuming the temperature as the judgement basis, adopt the intellectual PID control means to realize the accurate control to the feed liquid temperature;

the invention installs the condensing pressure regulator at the outlet of the condenser, one path of the outlet of the condensing pressure regulator enters the liquid storage device, the other path of the outlet is communicated to the pipeline between the compressor and the condenser through the NRD valve, thus realizing low-temperature refrigeration;

the invention divides a branch at the outlet of the filter to control the air to enter the air suction loop of the compressor through the electromagnetic valve and the capillary tube joint, thereby ensuring the high temperature protection which can occur when the compressor runs at high temperature or hot gas bypasses.

The invention has the beneficial effects that:

1) realize the accurate control of the liquid supply temperature

2) And the wide-temperature refrigeration work is realized.

3) Simple structure, convenient to use, easy maintenance, the reliability is high.

Drawings

FIG. 1 is a schematic diagram of the system 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 refrigerating device comprises a compressor 1, a condenser 2 provided with an axial flow fan 14, a condensation pressure regulator 3, an NRD valve 4, a reservoir 5, a filter 6, an expansion valve 7, a plate heat exchanger 8, an electromagnetic valve 9, a capillary tube 10, a gas-liquid separator 11 and an electronic expansion valve 13, wherein a refrigerant outlet end of the compressor 1 is connected with an inlet end of the condenser 2 through a pipeline, an outlet end of the condenser 2 is connected with an inlet end of the condensation pressure regulator 3 through a pipeline, an outlet end of the condensation pressure regulator 3 is communicated with the interior of the reservoir 5 through a pipeline, an inlet end of the filter 6 is communicated with the interior of the reservoir 5 through a pipeline, an outlet end of the filter 6 is connected with one end of the expansion valve 7 through a pipeline, the other end of the expansion valve 7 is connected with a refrigerant inlet, the gas phase outlet end of the gas-liquid separator 11 is connected with the refrigerator inlet end of the compressor 1 through a pipeline, thereby forming a refrigeration cycle loop, and the heat load of the condenser is discharged to the external space by an axial flow fan 14 configured on the condenser 2;

one end of the NRD valve 4 is communicated to a pipeline between the condensing pressure regulator 3 and the liquid storage device 5 through a pipeline bypass, and the other end of the NRD valve 4 is communicated to a pipeline between the compressor 1 and the condenser 2 through a pipeline bypass;

one end of the electromagnetic valve 9 is communicated to a pipeline between the filter 6 and the expansion valve 7 through a pipeline bypass, the other end of the electromagnetic valve 9 is connected with one end of the capillary tube 10 through a pipeline, and the other end of the capillary tube 10 is connected with the inlet end of the gas-liquid separator 11 through a pipeline;

one end of the electronic expansion valve 13 is communicated to a pipeline between the expansion valve 7 and the plate heat exchanger 8 through a pipeline bypass, and the other end of the electronic expansion valve 13 is communicated to a pipeline between the compressor 1 and the condenser 2 through a pipeline bypass.

In the invention, a low-pressure protector is communicated and installed between the gas-liquid separator 11 and the compressor 1 through a pipeline.

In the present invention, the electronic expansion valve 13 is controlled by PID.

In the invention, the condenser 2 adopts air forced convection to cool the refrigerant.

The invention cools the cooling liquid after heat exchange is carried out by the plate heat exchanger 8.

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 11 → compressor 1. The high-temperature refrigerant exchanges heat with air flowing through the condenser 2, and is then discharged to the surrounding atmosphere through the axial flow fan 14, thereby cooling the refrigerant, and the low-temperature refrigerant exchanges heat through the plate heat exchanger 8, thereby cooling 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 13 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 13 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 13 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 value between the liquid supply temperature and the set temperature and the change trend of the difference value as judgment basis, and adjusting the opening degree of the bypass electronic expansion valve 13 in real time, so as to adjust the bypass quantity in real time and finally realize the accurate control of the liquid supply temperature.

2) When the low-temperature refrigeration is carried out, besides the completion of the working process of the refrigeration system, the condensation pressure regulator 3 enters the NRD valve 4 in one way, the refrigerant coming out of the NRD valve 4 is mixed with the refrigerant coming out of the compressor 1 and then enters the condenser 2, 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;

3) during high-temperature refrigeration, besides the completion of the working process of the refrigeration system, in addition, a branch of the outlet of the filter 6 passes through the electromagnetic valve 9 and the capillary tube 10 in sequence to be subjected to throttling control and enters the gas-liquid separator 11, and the refrigerant discharged from the capillary tube 10 and the refrigerant discharged from the plate heat exchanger 8 are mixed in the gas-liquid separator 11 and then enter the compressor 1 for compression, so that high-temperature protection of the compressor 1 during high-temperature operation or hot gas bypass is ensured.

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.