Refrigerating system for adjusting pressure of refrigerating pipeline
By using sensors to detect compressor current and controlling solenoid valves to adjust the flow area in the pipeline, the vicious cycle problem caused by evaporator frosting in traditional refrigeration systems is solved, protecting the compressor and ensuring the normal operation and efficiency of the refrigeration system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO CIMC SPECIAL REEFER
- Filing Date
- 2025-05-16
- Publication Date
- 2026-05-12
AI Technical Summary
In the initial stage of low-temperature startup, traditional refrigeration systems suffer from insufficient heat exchange capacity of the condenser, leading to frost formation on the evaporator surface. This frost formation creates a vicious cycle, resulting in incomplete refrigerant evaporation, the compressor drawing in liquid refrigerant, damage to the compressor, and even causing the refrigeration system to alarm or stop operating, thus reducing its cooling capacity.
By introducing a sensor into the refrigeration system to detect the compressor current, the control device controls the second solenoid valve to open the bypass pipeline, adjust the pipeline flow area, ensure the compressor starts with differential pressure, and protect the compressor to operate normally.
Effectively establish a starting pressure differential to prevent compressor damage, ensure normal operation of the refrigeration system, avoid vicious cycles, and improve refrigeration efficiency.
Smart Images
Figure CN224230365U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to container refrigeration system technical field generally, more specifically, it relates to a kind of refrigeration system of adjusting refrigeration pipeline pressure. BACKGROUND
[0002] In the initial process of low-temperature start-up, under the condition that the heat load is large and the condenser heat exchange capacity is insufficient, the traditional refrigeration scheme is prone to low suction pressure, and it is difficult to establish a start-up pressure difference when the compressor is running, which can cause frosting on the surface of the evaporator, and the frosting can form a vicious cycle, making the frosting worse, and at the same time, the refrigerant is not fully evaporated, causing the compressor to suck in liquid refrigerant, which can damage the compressor, and even cause the refrigeration system to alarm or stop running, resulting in a decrease in refrigeration capacity and failure to achieve the expected cooling effect.
[0003] Therefore, it is necessary to provide a refrigeration system for adjusting refrigeration pipeline pressure to at least partially solve the above problems. SUMMARY
[0004] A series of simplified concepts are introduced in the summary section, which will be described in further detail in the detailed description section. The summary section of the utility model does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.
[0005] To at least partially solve the above problems, the utility model provides a refrigeration system for adjusting refrigeration pipeline pressure, which comprises an evaporator, a compressor, a condenser and an electronic expansion valve connected in sequence to form a closed loop circuit;
[0006] A first pipeline, one end of the first pipeline is connected to the evaporator, and the other end of the first pipeline is connected to the condenser;
[0007] A first solenoid valve is provided in the first pipeline, and the first solenoid valve is connected in series with the electronic expansion valve;
[0008] A bypass pipeline is connected in parallel to the first solenoid valve, and the inner diameter of the bypass pipeline is smaller than the inner diameter of the first pipeline;
[0009] A second solenoid valve is provided in the bypass pipeline;
[0010] A sensor is used to detect the current of the compressor; and
[0011] A control device is electrically connected to the sensor, and is configured to control the second electromagnetic valve to open for a first preset time when the current detected by the sensor is less than a first preset current value.
[0012] Optionally, after the second electromagnetic valve is operated for the first preset time, the second electromagnetic valve is closed and the first electromagnetic valve is opened.
[0013] Optionally, the refrigeration system further comprises a second pipeline, one end of the second pipeline being connected to an outlet of the evaporator, and the other end of the second pipeline being connected to an inlet of the compressor.
[0014] The refrigeration system further comprises a gas-liquid separator, which is arranged in the second pipeline.
[0015] Optionally, the refrigeration system further comprises a third pipeline, one end of the third pipeline being connected to an outlet of the compressor, and the other end of the third pipeline being connected to an inlet of the condenser.
[0016] The refrigeration system further comprises an oil-liquid separator, which is arranged in the third pipeline.
[0017] Optionally, the refrigeration system further comprises a liquid accumulator, which is arranged in the first pipeline.
[0018] Optionally, the refrigeration system further comprises a filter, which is arranged in the first pipeline and is arranged in series with the liquid accumulator.
[0019] Optionally, the filter is arranged in series with the first electromagnetic valve.
[0020] Optionally, the first preset current value ranges from and including 36A to and including 38A; and
[0021] The first preset time ranges from and including 110s to and including 120s.
[0022] Compared with the prior art, the refrigeration system for adjusting the pressure of a refrigeration pipeline has the following advantages
[0023] Advantages:
[0024] The compressor in the refrigeration system detects the current of the compressor through the sensor at the moment of starting, and the control device will control the second electromagnetic valve to open for the first preset time when judging that the current detected by the sensor is less than the first preset current value. BRIEF DESCRIPTION OF DRAWINGS
[0025] The following drawings for the embodiments of the present application are used herein as a part of the present application for understanding the present application.
[0026] Figure 1 The schematic diagram of the whole pipe connection structure of the refrigeration system for adjusting the refrigeration pipe pressure according to the preferred embodiment of the present application.
[0027] Reference signs:
[0028] 10: evaporator; 20: compressor; 30: condenser; 40: electronic expansion valve; 50: first pipe; 51: first electromagnetic valve; 60: bypass pipe; 61: second electromagnetic valve; 70: second pipe; 71: gas-liquid separator; 72: oil-liquid separator; 80: liquid accumulator; 90: filter; 91: third pipe. DETAILED DESCRIPTION
[0029] In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the embodiments of the present application can be implemented without one or more of these details. In other examples, some technical features known in the art are not described in order not to obscure the embodiments of the present application.
[0030] In order to thoroughly understand the embodiments of the present application, detailed structures will be proposed in the following description. Obviously, the implementation of the embodiments of the present application is not limited to the special details familiar to those skilled in the art.
[0031] The present application provides a refrigeration system for adjusting the refrigeration pipe pressure.
[0032] As Figure 1As shown, the refrigeration system for adjusting refrigeration pipeline pressure according to the utility model, including evaporator 10, compressor 20, condenser 30, electronic expansion valve 40, first pipeline 50, first solenoid valve 51, bypass pipeline 60, second solenoid valve 61, sensor (not shown in the drawing) and control device (not shown in the drawing).
[0033] In an embodiment of the utility model, the evaporator 10, compressor 20, condenser 30 and electronic expansion valve 40 in the refrigeration system of the utility model are sequentially communicated and form a closed loop circuit.
[0034] One end of first pipeline 50 is connected to evaporator 10, and the other end of first pipeline 50 is connected to condenser 30.
[0035] First solenoid valve 51 is arranged in first pipeline 50, and first solenoid valve 51 is arranged in series with electronic expansion valve 40.
[0036] Bypass pipeline 60 is connected in parallel to first solenoid valve 51, and the inner diameter of bypass pipeline 60 is less than the inner diameter of first pipeline 50.
[0037] Second solenoid valve 61 is arranged in bypass pipeline 60.
[0038] Sensor is used for detecting the current of compressor 20.
[0039] Control device is electrically connected to sensor, and control device is configured to control second solenoid valve 61 to open for a first preset time when the current detected by sensor is less than a first preset current value.The current of compressor 20 is detected by sensor at the moment of starting of compressor 20 in the refrigeration system of the utility model, and control device will control second solenoid valve 61 to open for a first preset time when it is judged that the current detected by sensor is less than a first preset current value.Because the inner diameter of first pipeline 50 is greater than the inner diameter of bypass pipeline 60, when second solenoid valve 61 is opened, the flow area of pipeline in the refrigeration system can be effectively reduced, so that the effect of more easily establishing starting pressure difference is achieved, the normal operation of compressor 20 is ensured, and the purpose of protecting compressor 20 is achieved.
[0040] As Figure 1As shown, in some preferred embodiments of this utility model, after the second solenoid valve 61 has been running for a first preset time, the second solenoid valve 61 is closed and the first solenoid valve 51 is opened. During the operation of the refrigeration system, by controlling the opening and closing of the second solenoid valve 61 on the bypass line 60 and the first solenoid valve 51 on the first line 50, the refrigerant flow rate can be controlled, making it easier for the compressor 20 to form a pressure difference during startup and facilitating the startup of the compressor 20. During the refrigeration process, when excessive line current is detected and the compressor 20 is overloaded, the refrigerant flow rate can be adjusted by controlling the opening and closing of the first solenoid valve 51 and the second solenoid valve 61, thereby preventing the compressor 20 from operating under overload for a long time, avoiding damage to the compressor 20, and achieving the purpose of protecting the compressor 20.
[0041] like Figure 1 As shown, in some preferred embodiments of the present invention, the refrigeration system further includes a second pipe 70, one end of which is connected to the outlet of the evaporator 10, and the other end of which is connected to the inlet of the compressor 20.
[0042] The refrigeration system also includes a gas-liquid separator 71, which is installed in the second pipeline 70. It should be noted that in the refrigeration system, the gas-liquid separator 71 prevents damage to the compressor 20 from the return of liquid refrigerant during startup, operation, or defrosting by separating and storing the liquid refrigerant in the pipeline. Specifically, the gas-liquid separator 71 protects the compressor 20 by separating the liquid, reducing the dilution of the oil in the crankcase of the compressor 20.
[0043] It should be noted that, for the sake of saving space, the working principle of the gas-liquid separator 71 will not be described in detail here.
[0044] like Figure 1 As shown, in some preferred embodiments of the present invention, the refrigeration system further includes a third pipe 91, one end of which is connected to the outlet of the compressor 20, and the other end of which is connected to the inlet of the condenser 30.
[0045] The refrigeration system also includes an oil separator 72, which is located in the third pipeline 91. The main function of the oil separator 72 is to separate the lubricating oil from the high-pressure steam discharged by the compressor 20 during the refrigeration process, so as to ensure that the refrigeration system can operate safely and efficiently.
[0046] It should be noted that, for the sake of saving space, the working principle of the oil separator 72 will not be described in detail here.
[0047] like Figure 1As shown, in some preferred embodiments of this utility model, the refrigeration system further includes a liquid receiver 80, which is disposed in the first pipeline 50. The liquid receiver 80 plays several important roles in the refrigeration system, mainly including gas-liquid separation, refrigerant buffering, balancing and stabilizing the refrigerant flow rate in the refrigeration system, storing and regulating the refrigerant dosage, preventing high-pressure gas from entering the low-pressure liquid section, and accommodating refrigerant during maintenance.
[0048] It should be noted that, for the sake of saving space, the working principle of the liquid reservoir 80 will not be elaborated here.
[0049] like Figure 1 As shown, in some preferred embodiments of this utility model, the refrigeration system further includes a filter 90, which is disposed in the first pipeline 50 and connected in series with the liquid receiver 80. The filter 90 in the refrigeration system mainly functions to filter impurities and absorb moisture. Specifically, the filter 90 can filter out various impurities in the refrigeration system, such as metal shavings, oxides, dust, etc., preventing these impurities from entering the compressor 20 and causing severe wear or even jamming inside the compressor 20; at the same time, the filter 90 can also absorb residual moisture in the refrigeration system, preventing ice blockage and corrosion, and extending the service life of the refrigeration system.
[0050] It should be noted that, for the sake of space, the working principle of filter 90 will not be elaborated here.
[0051] like Figure 1 As shown, in some preferred embodiments of this utility model, the filter 90 is connected in series with the first solenoid valve 51.
[0052] like Figure 1 As shown, in some preferred embodiments of this utility model, the range of the first preset current value is greater than or equal to 36A and less than or equal to 38A, and the range of the first preset time is greater than or equal to 110s and less than or equal to 120s. Specifically, when the sensor detects that the current in the compressor 20 is less than the first preset current value, the control device will control the second solenoid valve 61 to open for the first preset time, and the first solenoid valve 51 to close.
[0053] It should be noted that by opening the second solenoid valve 61 and running it for a first preset time, it can be ensured that the compressor 20 can obtain a stable starting pressure difference during the startup process, thereby ensuring the stable operation of the compressor 20.
[0054] It should be noted that the control device can be preferably a controller, and the structure and principle of the controller and the sensor are all conventional structures and principles in the art, that is, the utility model only selects the general controller and sensor, and does not improve the internal structure of the controller and the sensor, and for the sake of saving space, the specific working principle of the controller and the sensor will not be repeated here.
[0055] In summary, the compressor 20 in the refrigeration system of the utility model detects the current of the compressor 20 through a sensor at the moment of starting, and when the control device judges that the current detected by the sensor is less than the first preset current value, the control device will control the second electromagnetic valve 61 to open for the first preset time. Since the inner diameter of the first pipeline 50 is greater than the inner diameter of the bypass pipeline 60, when the second electromagnetic valve 61 is opened, the flow area of the pipeline in the refrigeration system can be effectively reduced, thereby more easily establishing the starting pressure difference, ensuring the normal operation of the compressor 20 subsequently, and achieving the purpose of protecting the compressor 20.
[0056] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0057] The utility model has been described through the above embodiment, but it should be understood that the above embodiment is only for the purpose of example and illustration, and is not intended to limit the utility model within the scope of the described embodiments. Those skilled in the art can understand that more kinds of variations and modifications can be made according to the teaching of the utility model, and these variations and modifications all fall within the scope of the utility model claimed.
Claims
1. A refrigeration system for regulating the pressure of refrigeration pipelines, characterized in that, The refrigeration system for regulating the pressure of the refrigeration pipeline includes an evaporator, a compressor, a condenser, and an electronic expansion valve connected in sequence to form a closed loop. A first pipeline, one end of which is connected to the evaporator and the other end of which is connected to the condenser; The first solenoid valve is located in the first pipeline and is connected in series with the electronic expansion valve. A bypass line is connected in parallel to the first solenoid valve, and the inner diameter of the bypass line is smaller than the inner diameter of the first line. A second solenoid valve is disposed in the bypass pipeline; A sensor for detecting the current of the compressor; as well as A control device electrically connected to the sensor is configured to control the second solenoid valve to open for a first preset time when the current detected by the sensor is less than a first preset current value.
2. The refrigeration system for regulating the pressure of the refrigeration pipeline according to claim 1, characterized in that, After the second solenoid valve has been in operation for the first preset time, the second solenoid valve is closed and the first solenoid valve is opened.
3. The refrigeration system for regulating the pressure of the refrigeration pipeline according to claim 1, characterized in that, The refrigeration system further includes a second pipeline, one end of which is connected to the outlet of the evaporator, and the other end of which is connected to the inlet of the compressor; The refrigeration system also includes a gas-liquid separator, which is disposed in the second pipeline.
4. The refrigeration system for regulating the pressure of the refrigeration pipeline according to claim 1, characterized in that, The refrigeration system also includes a third pipeline, one end of which is connected to the outlet of the compressor, and the other end of which is connected to the inlet of the condenser; The refrigeration system also includes an oil separator, which is located in the third pipeline.
5. The refrigeration system for regulating the pressure of the refrigeration pipeline according to claim 1, characterized in that, The refrigeration system also includes a liquid receiver, which is disposed in the first pipeline.
6. The refrigeration system for regulating the pressure of the refrigeration pipeline according to claim 5, characterized in that, The refrigeration system also includes a filter, which is disposed in the first pipeline and connected in series with the liquid receiver.
7. The refrigeration system for regulating the pressure of the refrigeration pipeline according to claim 6, characterized in that, The filter is connected in series with the first solenoid valve.
8. The refrigeration system for regulating the pressure of the refrigeration pipeline according to claim 1, characterized in that, The first preset current value is in the range of greater than or equal to 36A and less than or equal to 38A; and The first preset time ranges from greater than or equal to 110s to less than or equal to 120s.