Cold chain device and control method of cold chain device

Abstract

The application belongs to the technical field of refrigeration, and particularly relates to a cold chain equipment and a control method of the cold chain equipment. The cold chain equipment comprises a compressor, a condenser, an evaporator, a first temperature sensor, a second temperature sensor, a first pipeline, a second pipeline and a control module. The first temperature sensor is used for detecting the exhaust temperature of the compressor. The second temperature sensor is used for detecting the back gas temperature of the compressor. The condenser and the evaporator are arranged on the first pipeline. The inlet of the second pipeline is communicated with the outlet of the condenser, the outlet of the second pipeline is communicated with the inlet of the evaporator, and a liquid injection electromagnetic valve is arranged on the second pipeline. The control module is electrically connected with the liquid injection electromagnetic valve, the first temperature sensor and the second temperature sensor, and is used for controlling the opening of the liquid injection electromagnetic valve according to the exhaust temperature and the back gas temperature. The cold chain equipment in the application improves the judgment accuracy, reduces the misjudgment and reduces the power consumption of the cold chain equipment caused by misjudgment.

Description

Technical Field

[0001] This invention belongs to the field of refrigeration technology, specifically relating to a cold chain device and a control method for the cold chain device. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Currently, cold chain equipment used in cold chain transportation has a temperature sensor installed at the compressor's exhaust port. When the compressor's exhaust temperature is too high, the liquid injection solenoid valve is activated to cool the compressor. However, the activation of the liquid injection solenoid valve is determined solely by the temperature sensor at the exhaust port, which can easily lead to misjudgments and increase the power consumption of the cold chain equipment. Summary of the Invention

[0004] The purpose of this invention is to at least solve the problem in the prior art where the activation of the liquid injection solenoid valve is determined solely by the temperature sensor at the exhaust port, which is prone to misjudgment. This objective is achieved through the following technical solution: A first aspect of the present invention provides a cold chain device, comprising a compressor, a condenser, and an evaporator, the cold chain device further comprising: A first temperature sensor is used to detect the exhaust temperature of the compressor; A second temperature sensor is used to detect the return gas temperature of the compressor; The first pipeline, wherein the condenser and the evaporator are disposed on the first pipeline; A second pipeline, the inlet of which is connected to the outlet of the condenser, and the outlet of which is connected to the inlet of the evaporator, is equipped with a liquid injection solenoid valve; and The control module is electrically connected to the injection solenoid valve, the first temperature sensor, and the second temperature sensor. The control module is used to control the opening of the injection solenoid valve according to the exhaust temperature and the return gas temperature.

[0005] The cold chain equipment in this embodiment of the invention, by setting a first temperature sensor for detecting the exhaust temperature of the compressor and a second temperature sensor for detecting the return gas temperature of the compressor, and electrically connecting the first temperature sensor, the second temperature sensor and the liquid injection solenoid valve to the control module, can control the liquid injection solenoid valve according to the exhaust temperature and the return gas temperature of the compressor. The opening of the liquid injection solenoid valve cools the compressor, which improves the accuracy of judgment, reduces the occurrence of misjudgment, and reduces the increase in power consumption of the cold chain equipment due to misjudgment.

[0006] In addition, the cold chain equipment according to the present invention may also have the following additional technical features: In some embodiments of the present invention, the cold chain equipment further includes a third temperature sensor for detecting the temperature of the outdoor environment; The third temperature sensor is electrically connected to the control module.

[0007] In some embodiments of the present invention, at least one throttling element is further provided on the second pipeline.

[0008] A second aspect of the present invention provides a control method for cold chain equipment, the control method being implemented using the cold chain equipment mentioned in the above embodiments, the control method comprising: Obtain the compressor's discharge temperature and return gas temperature; Based on the fact that the exhaust temperature is greater than or equal to the first preset exhaust temperature and the return temperature is less than the first preset return temperature, a first duration for which the exhaust temperature is greater than or equal to the first preset exhaust temperature is obtained. Based on the first duration being greater than or equal to the first preset duration, the liquid spraying solenoid valve is controlled to open; Wherein, the first exhaust preset temperature is greater than the first return preset temperature.

[0009] In addition, the control method for cold chain equipment according to the present invention may also have the following additional technical features: In some embodiments of the present invention, the control method further includes: Based on the exhaust temperature being greater than or equal to the first preset exhaust temperature and the return gas temperature being greater than or equal to the first preset return gas temperature, the liquid injection solenoid valve is controlled to open directly.

[0010] In some embodiments of the present invention, the control method further includes: Obtain the outdoor ambient temperature; The step of controlling the liquid spraying solenoid valve to open based on the first duration being greater than or equal to the first preset duration includes: controlling the liquid spraying solenoid valve to open based on the outdoor ambient temperature being greater than or equal to the first ambient preset value and the return air temperature being less than the first return air preset temperature, and based on the first duration being greater than or equal to the first preset duration.

[0011] In some embodiments of the present invention, after acquiring the outdoor ambient temperature, the control method further includes: The liquid spraying solenoid valve is controlled to open based on the outdoor ambient temperature being less than a first ambient preset value and the return air temperature being less than a first return air preset temperature, and based on the first duration being greater than or equal to a second preset duration. The second preset duration is less than the first preset duration.

[0012] In some embodiments of the present invention, the control method further includes: The liquid injection solenoid valve is controlled to close if the return gas temperature is lower than the second return gas preset temperature. The second return gas preset temperature is lower than the first return gas preset temperature.

[0013] In some embodiments of the present invention, the preset temperature of the first exhaust gas is 105 to 130 degrees Celsius; And / or, the preset temperature of the first return gas is 13 to 18 degrees Celsius; And / or, the first preset duration is 8 to 15 seconds.

[0014] In some embodiments of the present invention, the preset temperature of the first exhaust gas is 115 to 120 degrees Celsius; And / or, the preset temperature of the first return gas is 14-16 degrees Celsius; And / or, the first preset duration is 9-12 seconds.

[0015] In some embodiments of the present invention, the second preset duration is 4 to 7 seconds. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the structure of a cold chain equipment according to an embodiment of the present invention is shown. Figure 2 for Figure 1 The diagram shows the flow direction of fluids in the cold chain equipment. Figure 3 for Figure 1 A flowchart illustrating the control method for the cold chain equipment shown. Figure 4 for Figure 1 The flowchart of the control method for the cold chain equipment shown is shown. Figure 5 for Figure 1 The flowchart shows the specific control method for the cold chain equipment.

[0017] The attached figures are labeled as follows: 100 refers to cold chain equipment; 10 is the compressor; 11 is the first pipeline; 12 is the second pipeline; 20 is the condenser; 21 is the condenser fan; 30 is an oil separator; 40 is the evaporator; 41 is the evaporator fan; 50 is a liquid storage tank; 61 is the first protection switch; 62 is the second protection switch; 63 is the sight glass; 70 is a drying container; 80 is the liquid injection solenoid valve; 90 represents a gas-liquid separator; 101 is the first temperature sensor; 102 is the second temperature sensor; 103 is the third temperature sensor; 104 is the fourth temperature sensor; 105 is the fifth temperature sensor; 106 is the regenerator; 107 is the capillary tube; 108 is the first throttling element; 109 is the second throttling element. Detailed Implementation

[0018] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0019] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0020] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0021] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0022] like Figures 1 to 5 As shown, according to a first aspect of an embodiment of the present invention, a cold chain device 100 is provided, such as... Figure 1 and Figure 2 As shown, where, Figure 1 A schematic diagram of the structure of a cold chain equipment 100 according to an embodiment of the present invention is shown. Figure 2 for Figure 1 The diagram shows the fluid flow structure of the cold chain equipment 100. The cold chain equipment 100 includes a compressor 10, a condenser 20, and an evaporator 40, which are connected in a ring shape via pipes. The cold chain equipment 100 also includes a first temperature sensor 101, a second temperature sensor 102, a liquid injection solenoid valve 80, a first pipe 11, a second pipe 12, and a control module (not shown). The first temperature sensor 101 is used to detect the exhaust temperature of the compressor 10; the first temperature sensor 101 is located at the exhaust port of the compressor 10 and can accurately detect the exhaust temperature of the compressor 10. The second temperature sensor 102 is used to detect the return gas temperature of the compressor 10. The second temperature sensor 102 is installed on the return gas pipeline of the compressor 10. The condenser 20 and the evaporator 40 are installed on the first pipeline 11. The inlet of the second pipeline 12 is connected to the outlet of the condenser 20, and the outlet of the second pipeline 12 is connected to the inlet of the evaporator 40. A liquid injection solenoid valve 80 is installed on the second pipeline 12. The control module is electrically connected to the liquid injection solenoid valve 80, the first temperature sensor 101, and the second temperature sensor 102. The control module is used to control the opening of the liquid injection solenoid valve 80 according to the exhaust temperature and the return gas temperature.

[0023] In this embodiment of the invention, the cold chain equipment 100 is equipped with a first temperature sensor 101 for detecting the exhaust temperature of the compressor 10 and a second temperature sensor 102 for detecting the return gas temperature of the compressor 10. The first temperature sensor 101, the second temperature sensor 102, and the liquid injection solenoid valve 80 are all electrically connected to the control module. The liquid injection solenoid valve 80 can be controlled according to the exhaust temperature and return gas temperature of the compressor 10. The opening of the liquid injection solenoid valve 80 cools the compressor 10, which improves the accuracy of judgment, reduces the occurrence of misjudgment, and reduces the increase in power consumption of the cold chain equipment 100 due to misjudgment.

[0024] The invention adds a second pipe 12, which can split the refrigerant flow. Compared with refrigerant with only one pipe, the temperature of the refrigerant can be reduced, thereby cooling the compressor.

[0025] It should be noted that the control module here can be the main control board of the cold chain equipment 100, used to control the opening or closing of the liquid spray solenoid valve 80 and other operations.

[0026] Optionally, in the cold chain equipment 100, in addition to the exhaust temperature and return gas temperature of the compressor 10 mentioned above, the temperature of the outdoor environment is also a parameter that we need to consider. Therefore, the cold chain equipment 100 also includes a third temperature sensor 103, which is used to detect the temperature of the outdoor environment; the third temperature sensor 103 is electrically connected to the control module.

[0027] When controlling the start of the liquid injection solenoid valve 80, not only the exhaust temperature and return gas temperature are considered, but also the outdoor ambient temperature. The factors considered in the opening of the liquid injection solenoid valve 80 of the cold chain equipment 100 are more comprehensive, which can enable the cold chain equipment 100 to achieve better cooling effect and reduce the energy consumption of the cold chain equipment 100 to a certain extent.

[0028] Optionally, the cold chain equipment 100 also includes an oil separator 30, which is disposed on the pipeline between the exhaust port of the compressor 10 and the inlet of the condenser 20, for separating oil and gas in the exhaust of the compressor 10.

[0029] Optionally, the cold chain equipment 100 further includes a liquid storage tank 50, a dryer 70, and a sight glass 63. The liquid storage tank 50, the dryer 70, and the sight glass 63 are sequentially arranged on the first pipeline 11 connecting the condenser 20 and the evaporator 40, and are arranged sequentially between the condenser 20 and the evaporator 40 along the refrigerant flow direction. A first throttling element 108 and a regenerator 106 are also provided on the first pipeline 11, and the refrigerant flow rate in the first pipeline is adjusted by the first throttling element 108.

[0030] It should be noted that the liquid storage tank 50 is equipped with a first protection switch 61 to protect the compressor 10. The first protection switch 61 is a high-pressure switch. When the pressure in the pipeline is too high, the first protection switch 61 will disconnect to avoid damaging the compressor 10.

[0031] At least one throttling element is also provided on the second pipeline 12. This throttling element can be at least one of the second throttling element 109 and the capillary tube 107. The capillary tube 107 can also be replaced by an electronic expansion valve. The second throttling element 109 and the capillary tube 107, along with the liquid injection solenoid valve 80, are all located on the second pipeline 12. One end of the second pipeline 12 is directly connected to the liquid storage tank 50, and the other end is directly connected to the evaporator 40. The outlet of the evaporator 40 is connected to the compressor 10 via a pipeline. A regenerator 106, a second protection switch 62, and a gas-liquid separator 90 are sequentially installed on the pipeline connecting the evaporator 40 and the compressor 10. The second protection switch 62 is a low-pressure protection switch. When the pressure in the pipeline is too low, the second protection switch 62 will disconnect to prevent damage to the compressor 10.

[0032] like Figure 1 As shown, the second throttling element 109 can be installed in the pipeline between the capillary tube 107 and the evaporator 40, or it can be installed in the pipeline between the liquid injection solenoid valve 80 and the capillary tube 107. That is, the second throttling element 109 is installed upstream of the capillary tube 107. With this arrangement, the return gas temperature of the compressor 10 can be reduced more effectively.

[0033] In addition, the cold chain equipment 100 also includes a fourth temperature sensor 104 and a fifth temperature sensor 105. The fourth temperature sensor 104 is used to detect the temperature near the evaporator 40, and the fifth temperature sensor 105 is used to detect the temperature near the condenser 20. Both the fourth temperature sensor 104 and the fifth temperature sensor 105 are electrically connected to the control module, and the evaporation temperature and condensation temperature can be controlled by the control module.

[0034] In addition, the cold chain equipment 100 here also includes a condenser fan 21 and an evaporator fan 41. The condenser fan 21 is located near the condenser 20 to accelerate heat exchange between the condenser 20 and the environment. The evaporator fan 41 is located near the evaporator 40 to accelerate heat exchange between the evaporator 40 and the environment. The environment in which the evaporator 40 is located is a freezing environment, such as the freezer compartment of the cold chain equipment 100.

[0035] It should be noted that the cold chain equipment 100 mentioned here includes cold chain trucks, cold chain containers, and cold storage facilities. It can be refrigeration equipment, such as refrigerated trucks and refrigerated cabinets, or refrigerated equipment, such as refrigerated trucks and refrigerated cabinets, or transportation equipment that has both refrigeration and refrigeration functions.

[0036] The refrigerant circulation process of the cold chain equipment 100 here can be referenced. Figure 2 The gas flows in the direction indicated by the arrow, that is, the gas discharged from the compressor 10 passes through the oil separator 30, condenser 20, liquid receiver 50, dryer 70, sight glass 63, regenerator 106, first throttling element 108, evaporator 40, regenerator 106, gas-liquid separator 90 in sequence before flowing back to the compressor 10.

[0037] The cold chain equipment 100 of the present invention adds a second pipeline 12 where the liquid injection solenoid valve 80 is located. When the liquid injection solenoid valve 80 is opened, part of the refrigerant will flow back to the compressor 10 after passing through the liquid injection solenoid valve 80, capillary tube 107, second throttling element 109, evaporator 40, regenerator 106, and gas-liquid separator 90 to cool the compressor 10.

[0038] It should be noted that the outlet of the second throttling element 109 can also be directly connected to the outlet of the evaporator 40. That is, when the liquid injection solenoid valve 80 is opened, part of the refrigerant will flow back to the compressor 10 after passing through the liquid injection solenoid valve 80, capillary tube 107, second throttling element 109, regenerator 106, and gas-liquid separator 90 to cool the compressor 10. At this time, the refrigerant does not need to pass through the evaporator 40. When the refrigerant passes through the regenerator 106, it can exchange heat with the surrounding environment and cool down, thus better cooling the compressor 10.

[0039] The regenerator 106 here has six ports: two ports are connected to the first pipe 11, two ports are connected to the second pipe 12, and the other two ports are connected to one end of the evaporator 40 and one end of the gas-liquid separator 90, respectively.

[0040] A second aspect of this invention provides a control method for a cold chain equipment 100, which is implemented using the cold chain equipment 100 mentioned in the above embodiments, such as... Figure 3 As shown, where, Figure 3 for Figure 1 A flowchart illustrating the control method for the cold chain equipment 100 shown. The control method includes: S31. Obtain the discharge temperature and return gas temperature of compressor 10; S32. Based on the exhaust temperature being greater than or equal to the first preset exhaust temperature and the return gas temperature being less than the first preset return gas temperature, obtain the first duration during which the exhaust temperature is greater than or equal to the first preset exhaust temperature. S33. Based on the first duration being greater than or equal to the first preset duration, control the liquid spraying solenoid valve 80 to open; The preset temperature of the first exhaust gas is greater than the preset temperature of the first return gas.

[0041] In S31, the discharge temperature of the compressor 10 is obtained by a first temperature sensor 101 installed at the discharge port of the compressor 10, and the return gas temperature of the compressor 10 is obtained by a second temperature sensor 102 installed on the return gas pipeline of the compressor 10.

[0042] In S32, there are two conditions: one is that the exhaust temperature is greater than or equal to the first preset exhaust temperature, and the other is that the return gas temperature is less than the first preset return gas temperature. When both conditions are met, the first duration for which the exhaust temperature is greater than or equal to the first preset exhaust temperature is obtained.

[0043] The first duration here is the duration during which the exhaust temperature is greater than or equal to the first preset exhaust temperature.

[0044] In S33, when the first duration is greater than or equal to the first preset duration, the liquid injection solenoid valve 80 is opened. This prevents the exhaust temperature of the compressor 10 from suddenly rising and then rapidly dropping. By setting the first duration for the exhaust temperature to be greater than or equal to the first preset exhaust temperature, this situation can be excluded, making the opening control of the liquid injection solenoid valve 80 more accurate and avoiding frequent opening of the liquid injection solenoid valve 80. The second return gas preset temperature is less than the first return gas preset temperature.

[0045] For a specific model of cold chain equipment 100, the first exhaust gas preset temperature can be set to 105 to 130 degrees Celsius. Of course, this first exhaust gas preset temperature can be adjusted according to different models of cold chain equipment 100; for example, it can be set to 120 to 140 degrees Celsius. The first return gas preset temperature is 13 to 18 degrees Celsius. Of course, this first return gas preset temperature can also be adjusted according to different models of cold chain equipment 100, such as setting it to 14 to 16 degrees Celsius. The first preset duration is 8 to 15 seconds. Of course, it can also be adjusted according to different models of cold chain equipment 100, such as adjusting the first preset duration to 8 to 12 seconds. Optionally, the first exhaust gas preset temperature can be 115 to 120 degrees Celsius; the first return gas preset temperature can be 14 to 16 degrees Celsius; and the first preset duration can be 9 to 12 seconds. This setting method can narrow the range of these set values, making the control process more precise.

[0046] More specifically, the first exhaust preset temperature can be set to 115 degrees Celsius; the first return gas preset temperature can be set to 15 degrees Celsius; and the first preset duration can be set to 10 seconds. In this case, S32 is correspondingly changed to obtain a first duration where the exhaust temperature is greater than or equal to the first exhaust preset temperature of 115 degrees Celsius, and the return gas temperature is less than the first return gas preset temperature of 15 degrees Celsius. S32 is then correspondingly changed to control the liquid injection solenoid valve 80 to open based on the first duration being greater than or equal to the first preset duration of 10 seconds.

[0047] Optionally, the control method further includes controlling the liquid injection solenoid valve 80 to open directly based on the exhaust temperature being greater than or equal to the first exhaust preset temperature and the return gas temperature being greater than or equal to the first return gas preset temperature.

[0048] The return gas temperature here is greater than or equal to the first return gas preset temperature, so the compressor 10 needs to be cooled down immediately. The compressor 10 is cooled down by opening the liquid injection solenoid valve 80. The first exhaust preset temperature and the first return gas preset temperature can be controlled as mentioned in the previous embodiment.

[0049] The outdoor temperature was not considered in this embodiment. However, the outdoor temperature needs to be considered when controlling the liquid injection solenoid valve 80. The outdoor temperature will be used as a parameter to control the liquid injection solenoid valve 80, and the corresponding control method will be described below.

[0050] Optionally, the control method further includes acquiring the temperature of the outdoor environment; controlling the liquid injection solenoid valve to open according to the first duration being greater than or equal to the first preset duration includes controlling the liquid injection solenoid valve 80 to open according to the outdoor environment temperature being greater than or equal to the first preset environmental value and the return air temperature being less than the first preset return air temperature, and according to the first duration being greater than or equal to the first preset duration.

[0051] The outdoor ambient temperature here is a parameter obtained through the third temperature sensor 103.

[0052] Optionally, after obtaining the outdoor ambient temperature, the control method further includes controlling the liquid injection solenoid valve 80 to open based on the outdoor ambient temperature being less than a first ambient preset value and the return air temperature being less than a first return air preset temperature, and based on a first duration being greater than or equal to a second preset duration; wherein the second preset duration is less than the first preset duration.

[0053] It should be noted that the first environmental preset value here is a range value, which can be 33 to 38 degrees Celsius, such as 35 degrees Celsius.

[0054] This method of controlling the liquid injection solenoid valve 80 takes into account three temperature parameters: the outdoor ambient temperature, the exhaust temperature of the compressor 10, and the return gas temperature of the compressor 10. This method can make the opening of the liquid injection solenoid valve 80 more accurate, reduce the occurrence of misjudgments, and reduce the increase in power consumption of the cold chain equipment 100 due to misjudgments.

[0055] Optionally, the control method further includes closing the liquid injection solenoid valve 80 based on the return gas temperature being lower than the second preset return gas temperature. The second preset return gas temperature is lower than the first preset return gas temperature. Optionally, the second preset duration is 4 to 7 seconds. For example, the second preset duration can be selected as 5 seconds or 6 seconds. Of course, the second preset duration can also be changed according to different models of cold chain equipment 100, for example, changing the second preset duration to 5 to 7 seconds.

[0056] It should be noted that after the liquid injection solenoid valve 80 is opened, the refrigerant returns to the return gas line of the compressor 10 in sequence from the liquid injection solenoid valve 80, capillary tube 107, second throttling element 109, evaporator 40, regenerator 106 and gas-liquid separator 90, thereby achieving the purpose of reducing the exhaust temperature of the compressor 10.

[0057] The refrigerant passing through the regenerator 106 is in a gaseous state and will undergo heat exchange, which will lower the temperature of the gaseous refrigerant and thus cool down the compressor 10, reducing the discharge temperature of the compressor 10.

[0058] When the return gas temperature is lower than the second preset return gas temperature, the liquid injection solenoid valve 80 is closed, allowing the compressor 10 to operate at normal temperature. It should be noted that the return gas temperature and the second preset return gas temperature are used to determine whether the liquid injection solenoid valve 80 needs to be closed. Alternatively, the exhaust temperature and the second preset exhaust temperature can also be used; the results will be the same. The second preset exhaust temperature can be set as needed, such as to 110 degrees Celsius or other temperatures.

[0059] Optionally, before closing the liquid injection solenoid valve 80 based on the return gas temperature being lower than the second preset return gas temperature, the control method for the cold chain equipment 100 further includes keeping the liquid injection solenoid valve 80 in the open state for a third duration. By keeping the liquid injection solenoid valve 80 in the open state, the compressor 10 is cooled, preventing the exhaust temperature of the compressor 10 from becoming too high. The second preset return gas temperature can be a range value, such as -3 to -8 degrees Celsius, or a specific value, such as -5 degrees Celsius.

[0060] like Figure 4 As shown, the entire control method of the cold chain equipment 100 includes the following three steps.

[0061] S41, control the opening of the liquid spray solenoid valve 80; S42. Keep the injection solenoid valve 80 in the open state for a third duration; S43. If the return gas temperature is lower than the second return gas preset temperature, control the liquid injection solenoid valve 80 to close.

[0062] It should be noted that the start time of the third duration is when the liquid injection solenoid valve 80 is activated, and the end time of the third duration is when the return gas temperature is lower than the second return gas preset temperature. The second return gas preset temperature can be a range value, such as -3 to -8 degrees Celsius, or a specific value, such as -5 degrees Celsius.

[0063] To better describe the control method of the cold chain equipment 100, the following will be combined with... Figure 5 This invention introduces a control method for the cold chain equipment 100. The control method for the cold chain equipment 100 specifically includes: S51, Obtain the exhaust temperature of compressor 10.

[0064] S52, Obtain the return gas temperature of compressor 10.

[0065] S53, Obtain the outdoor ambient temperature.

[0066] S54. Determine whether the exhaust temperature is greater than or equal to the first preset exhaust temperature of 115°C; if yes, proceed to S56; if no, continue to obtain the exhaust temperature of compressor 10.

[0067] S55, control the opening of the liquid spray solenoid valve 80.

[0068] S56. Determine whether the return gas temperature is greater than or equal to the first return gas preset temperature of 15℃; if yes, proceed to S55; if no, proceed to S57.

[0069] In other words, when the conditions in S54 and S56 are met simultaneously, the process proceeds to S55, which controls the opening of the liquid injection solenoid valve 80.

[0070] S57. Obtain the first duration for which the exhaust temperature is greater than or equal to the first preset exhaust temperature. S58. Determine whether the first duration is greater than or equal to the first preset duration of 10 seconds. If so, proceed to S59.

[0071] S59, control the opening of the liquid spray solenoid valve 80.

[0072] S60. Determine whether the outdoor ambient temperature is greater than or equal to the first ambient preset value of 35℃. If not, proceed to S61.

[0073] S61. Obtain a first duration during which the exhaust temperature is greater than or equal to the first preset exhaust temperature.

[0074] S62. Determine whether the first duration is greater than or equal to the second preset duration of 5 seconds; if so, proceed to S63.

[0075] S63, control the opening of the liquid spray solenoid valve 80.

[0076] In the above steps, S55, S59, and S63 actually constitute one process. For ease of description, three sequence numbers are used to refer to the opening of the injection solenoid valve 80. After the injection solenoid valve 80 is opened, the process can then proceed as follows: Figure 4 The control method shown in the figure controls the closing time of the liquid injection solenoid valve 80.

[0077] The control method of the cold chain equipment 100 in this invention will be described below using a specific application scenario. For example, if the ambient temperature detected by the third temperature sensor is 38 degrees Celsius, which is greater than the first preset ambient temperature of 35 degrees Celsius; the exhaust temperature detected by the first temperature sensor is 125 degrees Celsius, which is greater than the first preset exhaust temperature of 115 degrees Celsius; and the return gas temperature detected by the second temperature sensor is 18 degrees Celsius, which is greater than the first preset return gas temperature of 15 degrees Celsius, then the liquid injection solenoid valve 80 will be directly opened.

[0078] For example, if the ambient temperature detected by the third temperature sensor is 34 degrees Celsius, which is less than the first preset ambient temperature of 35 degrees Celsius; if the exhaust temperature detected by the first temperature sensor is 125 degrees Celsius, which is greater than the first preset exhaust temperature of 115 degrees Celsius; and if the return gas temperature detected by the second temperature sensor is 13 degrees Celsius, which is less than the first preset return gas temperature of 15 degrees Celsius, then the first duration for which the exhaust temperature is greater than or equal to the first preset exhaust temperature of 115 degrees Celsius is obtained, and based on the first duration being greater than or equal to the second preset duration of 5 seconds, the liquid injection solenoid valve 80 is controlled to open.

[0079] Additionally, it should be noted that the sequence numbers involved in S31, S32 and S33, S41, S42 and S43, and S51 to S63 are merely for ease of description and do not represent the order of selection of these processes.

[0080] The control method for the cold chain equipment 100 in this invention allows three temperature parameters to be incorporated into the control process of the liquid injection solenoid valve 80, thereby improving the cooling effect of the cold chain equipment 100 and reducing its energy consumption. Existing technologies only consider the compressor's exhaust temperature, which is prone to misjudgment and results in higher energy consumption for the cold chain equipment 100. The control method for the cold chain equipment 100 in this invention reduces the probability of misjudgment, leading to better cooling performance.

[0081] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A cold chain equipment, comprising a compressor, a condenser, and an evaporator, characterized in that, The cold chain equipment also includes: A first temperature sensor is used to detect the exhaust temperature of the compressor; A second temperature sensor is used to detect the return gas temperature of the compressor. The first pipeline, wherein the condenser and the evaporator are disposed on the first pipeline; A second pipeline, the inlet of which is connected to the outlet of the condenser, and the outlet of which is connected to the inlet of the evaporator, is equipped with a liquid injection solenoid valve; and The control module is electrically connected to the injection solenoid valve, the first temperature sensor, and the second temperature sensor. The control module is used to control the opening of the injection solenoid valve according to the exhaust temperature and the return gas temperature. A regenerator and a gas-liquid separator are sequentially installed on the pipeline connecting the evaporator and the compressor. The regenerator has six ports, two of which are connected to the first pipeline, two of which are connected to the second pipeline, and the other two ports are connected to the outlet end of the evaporator and one end of the gas-liquid separator, respectively.

2. The cold chain equipment according to claim 1, characterized in that, The cold chain equipment also includes a third temperature sensor, which is used to detect the temperature of the outdoor environment. The third temperature sensor is electrically connected to the control module.

3. The cold chain equipment according to claim 1, characterized in that, The second pipeline is also equipped with at least one throttling device.

4. A control method for a cold chain equipment, said control method being implemented using a cold chain equipment as described in any one of claims 1 to 3, characterized in that, The control method includes: Obtain the compressor's discharge temperature and return gas temperature; Based on the fact that the exhaust temperature is greater than or equal to the first preset exhaust temperature and the return temperature is less than the first preset return temperature, a first duration for which the exhaust temperature is greater than or equal to the first preset exhaust temperature is obtained. Based on the first duration being greater than or equal to the first preset duration, the liquid spraying solenoid valve is controlled to open; Wherein, the first exhaust preset temperature is greater than the first return preset temperature.

5. The control method for cold chain equipment according to claim 4, characterized in that, The control method further includes: Based on the exhaust temperature being greater than or equal to the first preset exhaust temperature and the return gas temperature being greater than or equal to the first preset return gas temperature, the liquid injection solenoid valve is controlled to open directly.

6. The control method for cold chain equipment according to claim 4, characterized in that, The control method further includes: Obtain the outdoor ambient temperature; The step of controlling the liquid spraying solenoid valve to open based on the first duration being greater than or equal to the first preset duration includes: controlling the liquid spraying solenoid valve to open based on the outdoor ambient temperature being greater than or equal to the first ambient preset value and the return air temperature being less than the first return air preset temperature, and based on the first duration being greater than or equal to the first preset duration.

7. The control method for cold chain equipment according to claim 6, characterized in that, After acquiring the outdoor ambient temperature, the control method further includes: The liquid spraying solenoid valve is controlled to open based on the outdoor ambient temperature being less than a first ambient preset value and the return air temperature being less than a first return air preset temperature, and based on the first duration being greater than or equal to a second preset duration. The second preset duration is less than the first preset duration.

8. The control method for cold chain equipment according to claim 4, characterized in that, The control method further includes: The liquid injection solenoid valve is controlled to close if the return gas temperature is lower than the second return gas preset temperature. The second return gas preset temperature is lower than the first return gas preset temperature.

9. The control method for cold chain equipment according to claim 4, characterized in that, The preset temperature of the first exhaust gas is 105 to 130 degrees Celsius; And / or, the preset temperature of the first return gas is 13 to 18 degrees Celsius; And / or, the first preset duration is 8 to 15 seconds.

10. The control method for cold chain equipment according to claim 4, characterized in that, The first exhaust temperature is preset to be 115 to 120 degrees Celsius; And / or, the preset temperature of the first return gas is 14-16 degrees Celsius; And / or, the first preset duration is 9-12 seconds.

11. The control method for cold chain equipment according to claim 7, characterized in that, The second preset duration is 4 to 7 seconds.

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