CN216048458U - Optimized self-cascade refrigeration system - Google Patents
Optimized self-cascade refrigeration system Download PDFInfo
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- CN216048458U CN216048458U CN202121542171.9U CN202121542171U CN216048458U CN 216048458 U CN216048458 U CN 216048458U CN 202121542171 U CN202121542171 U CN 202121542171U CN 216048458 U CN216048458 U CN 216048458U
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Abstract
The utility model discloses an optimized self-cascade refrigeration system, which belongs to the technical field of self-cascade refrigeration and comprises a compressor, a condenser, a gas-liquid separator, a filter, a high-temperature throttling device, a heat exchanger, a low-temperature throttling device and an evaporator which are sequentially connected; the high-temperature throttling device consists of an electromagnetic valve and a capillary tube, and a thermal expansion valve or an electronic expansion valve can also be directly adopted; the high-temperature stage throttling device is also connected with a temperature controller; the temperature controller respectively collects temperature signals at the tail end of the high-temperature throttling device and the inlet of the heat exchanger, compares the temperature signals and controls the high-temperature throttling device to be opened and closed. The utility model adopts the high-temperature throttling device with the switching function to optimize the refrigerating system, improves the temperature-pulling depth of the whole self-cascade refrigerating system, reduces the power of a press and improves the energy efficiency of the whole system.
Description
Technical Field
The utility model belongs to the technical field of self-cascade refrigeration, and particularly relates to an optimized self-cascade refrigeration system.
Background
In a conventional self-cascade refrigeration cycle, there are mainly four major components: the compressor, the evaporator, the condenser and the throttling device are used for cooling and controlling the temperature of the heat preservation box body. The mixed refrigerant is compressed by a compressor, discharged to a condenser for cooling, then enters a gas-liquid separator, the liquid refrigerant cooled by the condenser sinks in the gas-liquid separator, enters a heat exchanger after being throttled by a high-temperature-stage capillary tube, and rises to enter the other side of the heat exchanger. After the gaseous refrigerant exchanges heat with the liquid refrigerant, the gaseous refrigerant enters the storage box through the low-temperature capillary tube to cool the storage box. In the circulation process, the high-temperature refrigerant has reduced effect at the later stage of the circulation, and the improvement space exists.
In the existing auto-cascade refrigeration system, high-temperature refrigerant is used for throttling at the early stage and then refrigerating the temperature in the refrigerator, low-temperature refrigerant at the outlet of an evaporator and high-temperature refrigeration and mixed refrigerant after throttling are used for refrigerating the low-temperature refrigerant at the later stage, and the temperature is higher after the high-temperature refrigerant is throttled, so that the temperature-pulling depth of the machine can be influenced at the later stage of the operation of the machine.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides an optimized self-cascade refrigeration system, which realizes the content of a high-temperature refrigerant in the system circulation by controlling the on-off of a high-temperature throttling device, thereby influencing the integral temperature-pulling depth.
The technical scheme of the utility model is as follows:
an optimized self-cascade refrigeration system comprises a compressor, a condenser, a gas-liquid separator, a filter, a heat exchanger, a low-temperature throttling device and an evaporator, wherein a high-temperature throttling device capable of controlling opening and closing is connected between the filter and the heat exchanger.
Preferably, the filter, the high-temperature-stage throttling device and the heat exchanger are sequentially connected through copper pipes.
Preferably, the high-temperature stage throttling device consists of a solenoid valve and a capillary tube.
Preferably, the high-temperature stage throttling device is a thermostatic expansion valve.
Preferably, the high-temperature stage throttling device is an electronic expansion valve.
Preferably, the high-temperature stage throttling device is further connected with a temperature controller, a first temperature detection point is arranged at the tail end of the high-temperature stage throttling device, and a second temperature detection point is arranged at an inlet of the capillary tube entering the heat exchanger.
The utility model has the following beneficial technical effects:
the high-temperature-level throttling device with the switching function is adopted for optimization, and the temperature controller is used for detecting the temperature in real time to control the switching of the high-temperature-level throttling device, so that the temperature-pulling depth of the whole self-cascade refrigeration system is improved, the power of a press is reduced, and the energy efficiency of the whole system is improved.
Drawings
FIG. 1 is a schematic diagram of an optimized self-cascade refrigeration system;
wherein, 1-compressor; 2-a condenser; 3-a gas-liquid separator; 4-a filter; 5-a high-temperature stage throttling device; 6-a first temperature detection point; 7-a second temperature detection point; 8-a heat exchanger; 9-a low temperature throttling device; 10-evaporator.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, an optimized self-cascade refrigeration system comprises a compressor 1, a condenser 2, a gas-liquid separator 3, a filter 4, a high-temperature stage throttling device 5, a heat exchanger 8, a low-temperature throttling device 9 and an evaporator 10 which are connected in sequence. Wherein, the low-temperature throttling device 9 adopts capillary connection; the other parts are all connected by copper pipes. The high-temperature throttling device 5 can be composed of an electromagnetic valve and a capillary tube, or can be directly connected by a copper tube when a thermostatic expansion valve or an electronic expansion valve is directly adopted, and the capillary tube is not needed to be used.
In addition, the high-temperature stage throttling device 5 is also connected with a temperature controller. The temperature controller respectively collects the temperature at the tail end of the high-temperature stage throttling device and the temperature at the inlet of the capillary tube into the heat exchanger, the temperature and the temperature respectively correspond to the positions of a first temperature detection point 6 and a second temperature detection point 7 in the figure 1, and the second temperature detection point 7 is positioned at a point slightly above the first temperature detection point 6. The temperature controller compares the acquired temperature signals in real time and controls the opening and closing of the high-temperature throttling device 5. When the temperature at the tail end of the high-temperature stage throttling device is higher than the temperature at the inlet of the heat exchanger, the temperature controller controls the high-temperature stage throttling device 5 to be closed; instead, the high-temperature stage throttle 5 is controlled to open.
The system adopts a throttling device with a switching function, and the main optimization part adopts a high-temperature throttling device with a controllable switch to replace the traditional throttling device, so that the scheme that the traditional high-temperature refrigerant is fixedly throttled through a capillary tube can be changed. At the initial stage of starting the system, the throttling device is completely opened, and the temperature in the box is cooled by the cold energy of the high-temperature refrigerant; when the temperature controller detects that the temperature of the first temperature detection point 6 is higher than the temperature of the second temperature detection point 7, a closing signal is sent to the high-temperature-level throttling device, the throttling device is gradually closed, the temperature of the high-temperature refrigerant passing through the throttling device is reduced, meanwhile, the occupation ratio of the high-temperature refrigerant in the heat exchanger is reduced, the heat exchange between the high-temperature refrigerant in the heat exchanger and the mixed refrigerant at the outlet of the evaporator is reduced, and the heat exchange efficiency is improved; when the throttling device is in a closed state, the circulation amount of the high-temperature refrigerant in the system is close to zero, the high-temperature-level refrigerant gradually does not participate in the refrigeration cycle any more, and at the moment, the whole self-cascade refrigeration system can be regarded as regenerative refrigeration, so that the temperature-drawing depth of the system is improved, the power of a press is reduced, the COP (coefficient of performance) of the machine is increased, and the energy efficiency of the whole system is improved.
In the novel self-cascade refrigeration cycle, the high-temperature-level refrigerant is optimally used in the system cycle through the switch of the high-temperature-level throttling device, the low-temperature-level refrigerant is less in liquefaction amount in the early stage of the operation of the machine, and at the moment, the whole box body is cooled through the high-temperature-level refrigerant, so that the cooling speed of the machine set is increased. When the temperature in the refrigerator reaches a certain temperature, the effect of the high-temperature-level refrigerant in the system cycle is gradually reduced, the refrigerating capacity of the low-temperature-level refrigerant can be absorbed in the heat exchanger, the high-temperature-level refrigerant has a side effect on the refrigerating cycle, and at the moment, the content of the high-temperature-level refrigerant in the system cycle is reduced by closing the high-temperature-level throttling device, so that the heat loss of the low-temperature-level refrigerant in the system cycle is reduced, the temperature-pulling depth of the system is improved, and the refrigerating efficiency of the system is improved.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (6)
1. An optimized self-cascade refrigeration system comprises a compressor, a condenser, a gas-liquid separator, a filter, a heat exchanger, a low-temperature throttling device and an evaporator, and is characterized in that the high-temperature throttling device capable of controlling opening and closing is connected between the filter and the heat exchanger.
2. The optimized self-cascade refrigeration system of claim 1, wherein the filter, the high temperature stage throttling device, and the heat exchanger are connected in sequence by copper tubes.
3. The optimized self-cascade refrigeration system of claim 1, wherein the high temperature stage throttling device consists of a solenoid valve and a capillary tube.
4. The optimized self-cascade refrigeration system of claim 1, wherein the high-temperature stage throttling device is comprised of a thermostatic expansion valve.
5. The optimized self-cascade refrigeration system of claim 1, wherein the high-temperature stage throttling device is comprised of an electronic expansion valve.
6. The optimized self-cascade refrigeration system of claim 1, wherein the high-temperature stage throttling device is further connected with a temperature controller, a first temperature detection point is arranged at the tail end of the high-temperature stage throttling device, and a second temperature detection point is arranged at the inlet of the capillary tube into the heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121542171.9U CN216048458U (en) | 2021-07-08 | 2021-07-08 | Optimized self-cascade refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121542171.9U CN216048458U (en) | 2021-07-08 | 2021-07-08 | Optimized self-cascade refrigeration system |
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| Publication Number | Publication Date |
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| CN216048458U true CN216048458U (en) | 2022-03-15 |
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| CN202121542171.9U Active CN216048458U (en) | 2021-07-08 | 2021-07-08 | Optimized self-cascade refrigeration system |
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2021
- 2021-07-08 CN CN202121542171.9U patent/CN216048458U/en active Active
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