Refrigerating system capable of automatically adjusting evaporator according to refrigerating capacity requirement

Abstract

The refrigerating system capable of automatically adjusting the evaporator according to the refrigerating capacity requirement comprises a compressor, a discharge pipe and a condenser, the compressor is communicated with an air inlet of the condenser through the discharge pipe, and an adjusting assembly is installed outside the condenser. The adjusting assembly comprises a communicating pipe, a first two-way electromagnetic valve, a drying filter, a first evaporator, a second two-way electromagnetic valve, an air return pipe and a second evaporator. And one end of the communicating pipe is communicated with a liquid inlet of the liquid storage device. The refrigerant distribution of the system and the heat exchange area of the evaporator are adjusted according to actual refrigeration requirements, so that the refrigeration effect of the refrigeration system is optimal, redundant refrigerants are cut off, the load of the compressor is reduced when the refrigerant demand quantity of the system is small, meanwhile, the phenomena that the superheat degree of the evaporator is too low, the frosting amount is large, and additional defrosting energy consumption is increased are avoided, and the energy consumption is reduced. According to the refrigerating capacity demand, when the refrigerating capacity demand is small, the heat exchange area of the evaporator can be adjusted, the system resistance is reduced, and the system efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a refrigeration system, specifically a refrigeration system that automatically adjusts the evaporator according to the cooling capacity demand, and belongs to the field of refrigeration system technology. Background Technology

[0002] Currently, in the commercial refrigeration equipment market, horizontal service cabinets that can freely switch between refrigeration and freezing are highly favored due to their flexibility and versatility. However, these types of equipment often suffer from a common problem in their design and use: they tend to share the same evaporator and refrigerant system to achieve the switching between refrigeration and freezing functions. While this design simplifies the equipment structure to some extent, it also raises a series of issues that cannot be ignored.

[0003] For horizontal service cabinets, the refrigerant requirement differs significantly between refrigeration and freezing modes. In refrigeration mode, due to the need to maintain a lower temperature, the equipment requires a relatively larger amount of refrigerant to ensure sufficient cooling capacity. In freezing mode, because the required temperature is relatively higher, the equipment requires a relatively smaller amount of refrigerant. However, because existing designs share the evaporator and refrigerant system, excessive refrigerant often remains in the system when the equipment switches from refrigeration to freezing mode.

[0004] Excessive refrigerant will result in insufficient superheat of the evaporator, meaning a smaller difference between the evaporator surface temperature and the refrigerant saturation temperature. In this case, the compressor is prone to drawing in liquid refrigerant during the suction process, which is called liquid return. Liquid return not only reduces the compressor's refrigeration efficiency but also damages the compressor's internal components, such as dilution of lubricating oil and cylinder wear, thus seriously affecting the compressor's service life.

[0005] Moreover, excessive refrigerant can lead to excessive frost buildup on the evaporator. For open air curtain cabinets, excessive frost buildup on the evaporator will obstruct airflow and reduce the cooling effect. At the same time, the frost layer will also increase the thermal resistance of the evaporator, causing the refrigeration system to consume more energy to maintain the same cooling capacity. In addition, during the defrosting process, the defrosting time will be correspondingly longer due to the thicker frost layer, which increases energy consumption.

[0006] Therefore, a refrigeration system that automatically adjusts the evaporator according to the cooling capacity demand is proposed. Utility Model Content

[0007] In view of this, the present invention provides a refrigeration system that automatically adjusts the evaporator according to the cooling capacity requirement, so as to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial option.

[0008] The technical solution of this utility model embodiment is implemented as follows: a refrigeration system that automatically adjusts the evaporator according to the cooling capacity demand includes a compressor, a discharge pipe and a condenser, wherein the compressor is connected to the air inlet of the condenser through the discharge pipe, and an adjustment component is installed on the outside of the condenser;

[0009] The regulating assembly includes a connecting pipe, a first bidirectional solenoid valve, a drying filter, an inlet pipe, a ball valve, a liquid reservoir, a first evaporator, a second bidirectional solenoid valve, a return pipe, and a second evaporator.

[0010] One end of the connecting pipe is connected to the inlet of the liquid storage tank, and the two ends of the inlet pipe are connected to the outlet of the liquid storage tank and the inlet of the first evaporator, respectively. One end of the return gas pipe is connected to the outlet of the first evaporator. The first bidirectional solenoid valve is installed on the connecting pipe. The drying filter and the ball valve are installed in series on the inlet pipe. The second bidirectional solenoid valve is installed on the return gas pipe. The outlet of the second evaporator is connected to the return gas pipe through a pipeline.

[0011] More preferably, the other end of the connecting pipe is connected to the outlet of the condenser, the first outlet of the first bidirectional solenoid valve is connected to the connecting pipe, and the second outlet of the first bidirectional solenoid valve is connected to the inlet pipe.

[0012] More preferably, the second outlet of the first bidirectional solenoid valve is located between the dryer filter and the ball valve.

[0013] More preferably, the first outlet of the second bidirectional solenoid valve is connected to the return gas pipe, and the second outlet of the second bidirectional solenoid valve is connected to the inlet of the second evaporator through a pipe.

[0014] More preferably, the other end of the return gas pipe is connected to a gas-liquid separator, and the outlet of the gas-liquid separator is connected to the inlet of the compressor through a pipe.

[0015] More preferably, a first needle valve, a temperature sensor, a second needle valve, and a low-pressure protection switch are installed in series on the return air pipe.

[0016] More preferably, a high-pressure protection switch is installed on the discharge pipe.

[0017] More preferably, the inlet pipe is equipped with a sight glass and an expansion valve.

[0018] The present invention has the following advantages due to the adoption of the above technical solution:

[0019] This invention adjusts the refrigerant distribution and evaporator heat exchange area according to actual refrigeration needs, so that the refrigeration system can achieve the best refrigeration effect. When the system refrigerant demand is low, excess refrigerant is cut off, reducing the compressor load. At the same time, it avoids excessively low evaporator overheating and excessive frost, thus avoiding additional defrosting energy consumption. According to the refrigeration capacity demand, when the refrigeration capacity demand is low, the evaporator heat exchange area can be adjusted to reduce system resistance and improve system efficiency.

[0020] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural diagram of the refrigeration system of this utility model that automatically adjusts the evaporator according to the cooling capacity requirement;

[0023] Figure 2 This is a structural diagram of the adjustment component of this utility model;

[0024] Figure 3 This is a schematic diagram of the installation position of the first bidirectional solenoid valve of this utility model;

[0025] Figure 4 This is a schematic diagram showing the installation position of the second bidirectional solenoid valve of this utility model.

[0026] Reference numerals: 101, regulating component; 11, compressor; 12, discharge pipe; 13, condenser; 14, connecting pipe; 15, first two-way solenoid valve; 16, dryer filter; 17, liquid inlet pipe; 18, ball valve; 19, gas-liquid separator; 20, liquid receiver; 31, first evaporator; 32, second two-way solenoid valve; 33, return gas pipe; 34, first needle valve; 35, second evaporator; 36, expansion valve; 41, temperature sensor; 42, second needle valve; 43, high-pressure protection switch; 44, low-pressure protection switch; 45, sight glass. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0028] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0029] like Figures 1-4 As shown, this utility model embodiment provides a refrigeration system that automatically adjusts the evaporator according to the cooling capacity demand, including a compressor 11, a discharge pipe 12 and a condenser 13. The compressor 11 is connected to the air inlet of the condenser 13 through the discharge pipe 12. The compressor 11 is a variable frequency compressor. An adjustment component 101 is installed on the outside of the condenser 13.

[0030] The regulating assembly 101 includes a connecting pipe 14, a first bidirectional solenoid valve 15, a drying filter 16, an inlet pipe 17, a ball valve 18, a liquid reservoir 20, a first evaporator 31, a second bidirectional solenoid valve 32, a return gas pipe 33, and a second evaporator 35.

[0031] One end of the connecting pipe 14 is connected to the inlet of the liquid reservoir 20, and the other end of the connecting pipe 14 is connected to the outlet of the condenser 13, thereby connecting the condenser 13 and the liquid reservoir 20.

[0032] The two ends of the liquid inlet pipe 17 are connected to the liquid outlet of the liquid receiver 20 and the inlet of the first evaporator 31, respectively, and one end of the return pipe 33 is connected to the outlet of the first evaporator 31, so that the refrigerant can flow from the liquid inlet pipe 17 into the first evaporator 31.

[0033] The first bidirectional solenoid valve 15 is installed on the connecting pipe 14. The first outlet of the first bidirectional solenoid valve 15 is connected to the connecting pipe 14, and the second outlet of the first bidirectional solenoid valve 15 is connected to the liquid inlet pipe 17. The second outlet of the first bidirectional solenoid valve 15 is located between the dryer filter 16 and the ball valve 18. The flow path of the refrigerant can be adjusted by the first bidirectional solenoid valve 15. When the system cooling demand is low, the first bidirectional solenoid valve 15 closes the first outlet and opens the second outlet. At the same time, the ball valve 18 is closed. At this time, the liquid refrigerant goes directly to the dryer filter 16 through the second outlet of the first bidirectional solenoid valve 15, and then to the first evaporator 31 through the expansion valve 36. Since the refrigerant in the liquid receiver 20 is sealed in the liquid receiver 20, too much refrigerant can be avoided from entering the system, thereby improving the system cooling efficiency.

[0034] The dryer filter 16 and the ball valve 18 are connected in series on the liquid inlet pipe 17. The second bidirectional solenoid valve 32 is installed on the return gas pipe 33. The outlet of the second evaporator 35 is connected to the return gas pipe 33 through a pipe. The first outlet of the second bidirectional solenoid valve 32 is connected to the return gas pipe 33, and the second outlet of the second bidirectional solenoid valve 32 is connected to the inlet of the second evaporator 35 through a pipe. The refrigerant flowing into the second evaporator 35 can be controlled by the second bidirectional solenoid valve 32. When the freezer needs to freeze and the cooling capacity demand is large, the second bidirectional solenoid valve 32 opens to the second outlet and closes the first outlet. The refrigerant flows into the second evaporator 35 after passing through the first evaporator 31. The refrigerant changes from liquid to gas in the second evaporator 35 to exchange heat, thus meeting the demand for cooling capacity.

[0035] In one embodiment, the other end of the return pipe 33 is connected to a gas-liquid separator 19. The outlet of the gas-liquid separator 19 is connected to the inlet of the compressor 11 through a pipe. The gas-liquid separator 19 can separate the gas and liquid refrigerant, preventing the liquid refrigerant from entering the compressor 11 and causing damage to the compressor 11.

[0036] In one embodiment, a first needle valve 34, a temperature sensor 41, a second needle valve 42, and a low-pressure protection switch 44 are connected in series on the return gas pipe 33, a high-pressure protection switch 43 is installed on the discharge pipe 12, and a sight glass 45 and an expansion valve 36 are installed on the liquid inlet pipe 17.

[0037] When this utility model is working: the gaseous refrigerant is discharged from the compressor 11 to the condenser 13, and exchanges heat with the environment through the condenser 13, changing from a gaseous state to a liquid state. The liquid refrigerant passes through the liquid receiver 20 and the dryer filter 16 to the expansion valve 36. After the pressure is reduced by the expansion valve 36, it reaches the evaporator, and the refrigerant changes from a liquid state to a gaseous state. The evaporator absorbs heat, thereby reducing the temperature inside the display case.

[0038] When the system's cooling demand is low, the first two-way solenoid valve 15 closes the first outlet and opens the second outlet. At the same time, the ball valve 18 closes. The liquid refrigerant from the condenser 13 goes directly to the dryer filter 16 through the second outlet of the first two-way solenoid valve 15, and then to the evaporator through the expansion valve 36 for heat exchange to meet the cooling demand. At this time, the refrigerant in the receiver 20 is sealed in the receiver 20 to prevent excessive refrigerant from entering the system, thereby improving the system's cooling efficiency and preventing the evaporator from overheating and excessive frost on the evaporator, which would affect the system's energy consumption.

[0039] When the freezer needs to freeze, the cooling capacity is large and the evaporator temperature is low. The compressor 11 operates in the high speed range. At this time, both the first evaporator 31 and the second evaporator 35 need to cool at the same time to meet the cooling demand. The second two-way solenoid valve 32 opens to the second outlet and closes the first outlet. The refrigerant flows through the first evaporator 31 and then into the second evaporator 35. The refrigerant changes from liquid to gas in the second evaporator 35 to exchange heat. After passing through the gas-liquid separator 19, it finally flows into the compressor 11.

[0040] When the display case needs to be refrigerated, the cooling demand is small and the evaporation temperature is relatively high. The compressor 11 operates in the low speed range. At this time, only one evaporator is working to meet the cooling demand. At this time, the second two-way solenoid valve 32 closes the second outlet connected to the second evaporator 35 and switches to the first outlet. The refrigerant passes through the first evaporator 31 and then directly returns to the compressor 11 through the return pipe 33 and the gas-liquid separator 19.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A refrigeration system that automatically adjusts the evaporator according to cooling capacity demand, comprising a compressor (11), a discharge pipe (12), and a condenser (13), characterized in that: The compressor (11) is connected to the air inlet of the condenser (13) through the discharge pipe (12), and an adjustment component (101) is installed on the outside of the condenser (13); The regulating assembly (101) includes a connecting pipe (14), a first bidirectional solenoid valve (15), a drying filter (16), an inlet pipe (17), a ball valve (18), a liquid reservoir (20), a first evaporator (31), a second bidirectional solenoid valve (32), a return gas pipe (33), and a second evaporator (35). One end of the connecting pipe (14) is connected to the inlet of the liquid reservoir (20), and the two ends of the inlet pipe (17) are connected to the outlet of the liquid reservoir (20) and the inlet of the first evaporator (31), respectively. One end of the return gas pipe (33) is connected to the outlet of the first evaporator (31). The first bidirectional solenoid valve (15) is installed on the connecting pipe (14). The dryer filter (16) and the ball valve (18) are connected in series on the inlet pipe (17). The second bidirectional solenoid valve (32) is installed on the return gas pipe (33). The outlet of the second evaporator (35) is connected to the return gas pipe (33) through a pipe.

2. The refrigeration system that automatically adjusts the evaporator according to cooling capacity demand as described in claim 1, characterized in that: The other end of the connecting pipe (14) is connected to the outlet of the condenser (13), the first outlet of the first bidirectional solenoid valve (15) is connected to the connecting pipe (14), and the second outlet of the first bidirectional solenoid valve (15) is connected to the liquid inlet pipe (17).

3. A refrigeration system that automatically adjusts the evaporator according to cooling capacity demand as described in claim 2, characterized in that: The second outlet of the first bidirectional solenoid valve (15) is located between the dryer filter (16) and the ball valve (18).

4. A refrigeration system that automatically adjusts the evaporator according to cooling capacity demand as described in claim 1, characterized in that: The first outlet of the second bidirectional solenoid valve (32) is connected to the return gas pipe (33), and the second outlet of the second bidirectional solenoid valve (32) is connected to the inlet of the second evaporator (35) through a pipe.

5. A refrigeration system that automatically adjusts the evaporator according to cooling capacity demand as described in claim 4, characterized in that: The other end of the return gas pipe (33) is connected to a gas-liquid separator (19), and the outlet of the gas-liquid separator (19) is connected to the inlet of the compressor (11) through a pipe.

6. A refrigeration system that automatically adjusts the evaporator according to cooling capacity demand as described in claim 5, characterized in that: The return pipe (33) is equipped with a first needle valve (34), a temperature sensor (41), a second needle valve (42), and a low-pressure protection switch (44) connected in series.

7. A refrigeration system that automatically adjusts the evaporator according to cooling capacity demand as described in claim 1, characterized in that: A high-voltage protection switch (43) is installed on the discharge pipe (12).

8. A refrigeration system that automatically adjusts the evaporator according to cooling capacity demand as described in claim 1, characterized in that: The inlet pipe (17) is equipped with a sight glass (45) and an expansion valve (36).

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