Refrigerating system of tank container and control method of refrigerating system

Abstract

The invention relates to a refrigerating system of a tank container and a control method of the refrigerating system. The refrigeration system of the tank container comprises a refrigeration unit, a heat exchange unit, a cooling unit, a detection unit and a control unit. The refrigeration unit comprises a compressor, a condenser, an evaporator and a circulation pipeline communicating the compressor, the condenser and the evaporator, and the circulation pipeline is filled with refrigerants. The heat exchange unit comprises a heat exchange pipeline, the heat exchange pipeline is filled with a secondary refrigerant, and the secondary refrigerant is used for bringing heat of the tank into the evaporator. The cooling unit comprises a cooling pipeline and a cooling device, and the cooling device is used for cooling the secondary refrigerant in the cooling pipeline. The detection unit is used for detecting the temperature of the secondary refrigerant. The control unit comprises a controller and a control valve. The controller is used for controlling the control valve to be communicated with the cooling pipeline or the heat exchange pipeline according to temperature detection signals of the detection unit. According to the refrigerating system, the influence of too high refrigerant temperature on the system can be reduced, and the working temperature range of the refrigerating system is widened.

Description

Technical Field

[0001] The present invention relates to the technical field of tank containers, and in particular to a refrigeration system of a tank container and a control method thereof. Background Art

[0002] Tank containers are mainly used for long-distance transportation of goods such as battery electrolytes, fresh food, and chemicals. These goods need to be within a certain temperature range during transportation. The current technology used to control the temperature of tank containers is mainly to equip them with a refrigeration system.

[0003] When the existing tank container refrigeration system is in operation, the refrigeration system often fails to work properly due to the refrigerant temperature being too high. For example, when the refrigerant temperature is too high, the refrigerant will evaporate in the evaporator to produce more gas, and more gas will cause the subsequent compressor to compress the gaseous refrigerant with higher intensity. If this continues for a long time, it will cause the compressor to be thermally protected, causing the refrigeration system to fail to work properly, and even causing damage to the components in the refrigeration system. Therefore, a tank container refrigeration system with more stable operation is urgently needed. Summary of the invention

[0004] One purpose of the present invention is to solve the deficiencies in the prior art and provide a refrigeration system for a tank container. To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A refrigeration system for a tank container, comprising:

[0006] A refrigeration unit, which includes a compressor, a condenser and an evaporator, and a circulation pipeline connecting the compressor, the condenser and the evaporator, the circulation pipeline is filled with a refrigerant, the refrigerant releases heat in the condenser and absorbs heat in the evaporator;

[0007] The heat exchange unit includes a heat exchange pipeline, which is connected to the refrigeration pipeline on the tank and connected to the evaporator. The heat exchange pipeline is filled with a coolant, which is used to bring the heat of the tank into the evaporator;

[0008] The cooling unit includes a cooling pipeline and a cooling device. The cooling pipeline is connected to the evaporator. The cooling device is used to cool the refrigerant in the cooling pipeline. The refrigerant enters the evaporator after being cooled by the cooling device.

[0009] A detection unit, which is arranged on the heat exchange pipeline and is used to detect the temperature of the coolant;

[0010] The control unit includes a controller and a control valve. The controller is electrically connected to the detection unit and the control valve. The control valve is used to control the coolant to enter the cooling pipeline or the heat exchange pipeline. The controller is used to control the control valve to connect the cooling pipeline or the heat exchange pipeline according to the temperature detection signal of the detection unit.

[0011] In one embodiment, the control valve is a three-way valve, one of the interfaces of the three-way valve is connected to the refrigerant outlet of the evaporator, and the other two interfaces of the three-way valve are respectively connected to the cooling pipeline and the heat exchange pipeline, so that the refrigerant output by the evaporator can selectively enter the cooling pipeline for cooling or enter the heat exchange pipeline to refrigerate the tank box.

[0012] In one embodiment, the detection unit includes a temperature sensor, and the temperature sensor is arranged on a pipeline on a side of a refrigerant outlet of the evaporator;

[0013] The controller is electrically connected to the temperature sensor, and is used to control the control valve to connect the cooling pipeline or the heat exchange pipeline according to the temperature detection signal of the temperature sensor.

[0014] In one embodiment, the cooling device comprises a cooling box, part of the cooling pipeline is arranged in the cooling box, a cooling medium is stored in the cooling box, and the cooling medium is used to cool the coolant in the cooling pipeline; and / or

[0015] The cooling device includes a cooling fan, which is arranged corresponding to the cooling pipeline and is used to air-cool the coolant in the cooling pipeline.

[0016] In one of the embodiments, the refrigeration system further includes a pressure relief device, which is disposed on the cooling pipeline and / or the heat exchange pipeline, and is used to balance the internal and external pressure difference of the cooling pipeline and / or the heat exchange pipeline.

[0017] In one of the embodiments, the refrigeration system further includes a driving pump, which is disposed on a pipeline on a side of a refrigerant inlet of the evaporator, and is used to drive the flow of the refrigerant.

[0018] In one embodiment, the refrigeration system further includes a regulating valve and a pressure detection device, the regulating valve is arranged on the circulation pipeline and is used to connect the compressor and the evaporator, and the pressure detection device is used to detect the pressure of the circulation pipeline;

[0019] The regulating valve is electrically connected to the pressure detection device, and the regulating valve is used to open or close according to a pressure detection signal from the pressure detection device.

[0020] In one of the embodiments, the refrigeration unit further comprises a condensing fan, and the condensing fan is arranged corresponding to the condenser;

[0021] The controller is electrically connected to the pressure detection device and the condensing fan, and the controller is used to control the start or stop of the condensing fan according to the pressure detection signal of the pressure detection device.

[0022] Another object of the present invention is to provide a method for controlling a refrigeration system of a tank container as described in any one of the above, comprising:

[0023] Collect the temperature of the refrigerant output by the evaporator;

[0024] Compare the temperature of the coolant with the preset temperature to determine whether the temperature of the coolant is within the preset temperature;

[0025] If the temperature of the coolant is greater than the preset temperature, the control valve is controlled to connect the cooling pipeline so that the coolant is cooled in the cooling unit;

[0026] If the temperature of the coolant is less than or equal to the preset temperature, the control valve is controlled to connect the heat exchange pipeline, so that the coolant and the refrigerant exchange heat in the evaporator to cool the medium in the tank.

[0027] Another object of the present invention is to provide a control method for a refrigeration system of a tank container as described in the above items, comprising:

[0028] Collect pressure data of circulation pipeline;

[0029] The pressure of the circulation pipeline is compared with the preset pressure. If the pressure of the circulation pipeline is lower than the preset pressure, the control regulating valve is opened.

[0030] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0031] In the present invention, the refrigeration system of the tank container includes a refrigeration unit, a heat exchange unit, a cooling unit, a detection unit and a control unit. When the temperature of the refrigerant in the refrigeration unit is too high, the secondary coolant can be cooled by the cooling unit, and the heat exchange between the cooled secondary coolant and the refrigerant can effectively reduce the temperature of the refrigerant. Therefore, the refrigeration system of the tank container of the present application can effectively reduce the impact of the excessive refrigerant temperature on the system, avoid the increase in the load of the refrigeration system due to the excessive temperature of the refrigerant, and thus ensure the normal operation of the refrigeration system.

[0032] Furthermore, the cooling unit can effectively reduce the temperature of the refrigerant, and the detection unit and the control unit can monitor and adjust the temperature of the refrigerant in real time, thereby effectively preventing the refrigerant from evaporating excessively in the evaporator due to the high temperature of the refrigerant, and preventing the refrigeration system from not being able to operate normally due to excessive compression working pressure of the compressor. Therefore, the refrigeration system of the tank container of the present application has a wider operating temperature range and better stability, safety and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of a refrigeration system of a tank container according to an embodiment of the present invention.

[0034] Figure 2 It is a schematic diagram of the control principle of the refrigeration system of the tank container according to an embodiment of the present invention.

[0035] Figure 3 It is a flow chart of a method for controlling a refrigeration system of a tank container according to an embodiment of the present invention.

[0036] Figure 4 yes Figure 3 Schematic diagram of the working principle of the control method shown.

[0037] Figure 5 It is a flow chart of a method for controlling a refrigeration system of a tank container according to another embodiment of the present invention.

[0038] The following are the descriptions of the reference numerals:

[0039] 10-refrigeration unit; 11-compressor; 12-condenser; 13-evaporator; 14-circulation pipeline; 15-regulating valve; 16-pressure detection device; 17-condensing fan;

[0040] 20-heat exchange unit; 21-heat exchange pipeline; 22-driving pump;

[0041] 30-cooling unit; 31-cooling pipeline; 32-cooling device;

[0042] 40-detection unit; 41-temperature sensor;

[0043] 50-control unit; 51-controller; 52-control valve. DETAILED DESCRIPTION

[0044] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0045] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] See also Figure 1 and Figure 2 As shown, the refrigeration system of the tank container in the embodiment of the present invention includes a refrigeration unit 10, a heat exchange unit 20, a cooling unit 30, a detection unit 40 and a control unit 50. The refrigeration unit 10 includes a compressor 11, a condenser 12 and an evaporator 13, and a circulation pipeline 14 connecting the compressor 11, the condenser 12 and the evaporator 13. The circulation pipeline 14 is filled with a refrigerant, and the refrigerant releases heat in the condenser 12 and absorbs heat in the evaporator 13. For example, the refrigerant can be Freon.

[0048] It should be noted that the refrigeration unit 10 may also include common components of a refrigeration system, such as an expansion valve, a dryer, and a liquid storage tank for storing refrigerant, and the present application does not make any specific limitation on this.

[0049] The heat exchange unit 20 includes a heat exchange pipeline 21, which is connected to the refrigeration pipe on the tank and connected to the evaporator 13. The heat exchange pipeline 21 is filled with a coolant, which is used to bring the heat of the tank into the evaporator 13. For example, the coolant can be ethylene glycol, or the coolant can also be a liquid such as water.

[0050] When the refrigeration system is operating normally, the refrigerant in the refrigeration unit 10 exchanges heat with the external environment, and then exchanges heat with the coolant in the heat exchange unit 20, transferring heat or cold to the coolant. The coolant exchanges heat with the medium contained in the tank container to cool the medium in the tank container, so that the tank container can adapt to a wider range of transportation temperature requirements.

[0051] However, when the secondary coolant and the refrigerant exchange heat, if the secondary coolant temperature is too high, the refrigerant will absorb more heat, making the refrigerant temperature too high, which will indirectly cause the refrigerant to evaporate in the evaporator 13 to produce more gas. More gas will cause the subsequent compressor 11 to compress the gaseous refrigerant and perform a higher intensity compression work. If this continues for a long time, the compressor 11 will be thermally protected, making the refrigeration system unable to work normally.

[0052] Therefore, in the present application, the cooling unit 30 is provided to cool the secondary coolant to avoid the adverse effect of excessive refrigerant temperature on the compressor 11. For example, Figure 1 As shown, the cooling unit 30 includes a cooling pipeline 31 and a cooling device 32. The cooling pipeline 31 is connected to the evaporator 13. The cooling device 32 is used to cool the coolant in the cooling pipeline 31. The coolant enters the evaporator 13 after being cooled by the cooling device 32.

[0053] In this embodiment, by setting up a cooling unit 30 to cool the refrigerant, it is possible to effectively prevent the refrigerant temperature from being too high due to the refrigerant temperature being too high, thereby preventing the refrigerant from over-evaporating in the evaporator 13 due to the high temperature, and preventing the compressor 11 from being unable to operate the refrigeration system normally due to excessive compression working pressure.

[0054] See also Figure 1 In one embodiment, the cooling device 32 includes a cooling box, and part of the cooling pipeline 31 is arranged in the cooling box. The cooling box stores a cooling medium, and the cooling medium is used to cool the coolant in the cooling pipeline 31. The cooling medium can be water or ethylene glycol or other cooling liquids.

[0055] In this embodiment, when the coolant in the cooling pipeline 31 passes through the cooling box, the coolant can be cooled by the cooling medium to achieve temperature reduction, thereby preventing the refrigerant from being too high and ensuring the normal operation of the refrigeration system.

[0056] In other embodiments, the cooling device 32 may include a cooling fan, which is arranged corresponding to the cooling pipeline 31. The cooling fan is used to air-cool the coolant in the cooling pipeline 31. In this embodiment, the cooling fan can quickly take away the heat of the coolant in the cooling pipeline 31, thereby effectively reducing the temperature of the coolant.

[0057] In other embodiments, the cooling device 32 may include a cooling box and a cooling fan, and the cooling fan is arranged corresponding to the cooling box. Therefore, by cooling the coolant in the cooling pipeline 31 simultaneously with the cooling box and the cooling fan, the cooling speed of the coolant can be accelerated, and the cooling efficiency of the coolant can be improved.

[0058] It can be understood that in other embodiments, the cooling device 32 can also be a cooling structure such as a cooler, depending on the specific situation.

[0059] In one embodiment, the refrigeration system further includes a pressure relief device, which can be disposed on the cooling pipeline 31 and can be used to balance the internal and external pressure difference of the cooling pipeline 31 .

[0060] The pressure relief device may also be provided on the heat exchange pipeline 21, and is used to balance the internal and external pressure difference of the heat exchange pipeline 21. The pressure relief device may be a vent valve or a pressure relief valve, and the like.

[0061] By setting up a pressure relief device, the interior of the cooling pipeline 31 and / or the heat exchange pipeline 21 can be connected to the outside as needed to balance the pressure difference between the inside and outside of the pipeline, so as to solve the problem that the refrigerant temperature is too high or too low, resulting in a certain degree of change in the pipeline pressure in the system, and the hidden dangers caused by the pipeline pressure change to the safe operation of the overall system.

[0062] like Figure 1 and Figure 2 As shown, in the present application, the detection unit 40 is mainly used to detect the temperature of the brine output by the evaporator 13. The control unit 50 is used to cool the brine according to the temperature detection signal of the detection unit 40.

[0063] Specifically, the detection unit 4 can be arranged on the heat exchange pipeline 21, which can detect the temperature of the coolant output by the evaporator 13. For example, the detection unit 40 includes a temperature sensor 41, and the temperature sensor 41 can be arranged on the pipeline on the coolant outlet side of the evaporator 13. When the temperature sensor 41 detects that the coolant temperature is high, it indicates that the coolant needs to be cooled. Among them, the temperature sensor 41 can be a contact temperature sensor. Alternatively, the temperature sensor 41 can also be a non-contact temperature sensor.

[0064] like Figure 2 As shown, the control unit 50 includes a controller 51 and a control valve 52. The controller 51 may be a PLC controller. The control valve 52 may be disposed between the evaporator 13 and the cooling pipeline 31 and the heat exchange pipeline 21, and is used to control the coolant to enter the cooling pipeline 31 or the heat exchange pipeline 21.

[0065] For example, the control valve 52 may be a three-way valve. One of the interfaces of the three-way valve is connected to the refrigerant outlet of the evaporator 13, and the other two interfaces of the three-way valve are respectively connected to the cooling pipeline 31 and the heat exchange pipeline 21, so that the refrigerant output by the evaporator 13 can selectively enter the cooling pipeline 31 for cooling or enter the heat exchange pipeline 21 for refrigerating the tank box.

[0066] The controller 51 is electrically connected to the temperature sensor 41 and the three-way valve. The controller 51 can control the three-way valve to connect the cooling pipeline 31 or the heat exchange pipeline 21 according to the temperature detection signal of the temperature sensor 41. Figure 1 As shown, the interfaces of the three-way valve can be interface 52a, interface 52b and interface 52c. Interface 52a is connected to the refrigerant outlet of the evaporator 13 and is always open. Interface 52b is connected to the cooling pipeline 31, and interface 52c is connected to the heat exchange pipeline 21.

[0067] When the temperature sensor 41 detects that the coolant temperature is too high, the controller 51 can control the three-way valve interface 52c to close and the interface 52b to open, so that the coolant can enter the cooling pipeline 31 for cooling. After the coolant has been cooled for several cycles, when the temperature sensor 41 detects that the coolant temperature has reached the set appropriate temperature, the controller 51 can control the three-way valve interface 52c to open and the interface 52b to close, so that the coolant can normally enter the heat exchange pipeline 21 to exchange heat with the refrigerant in the evaporator 13, thereby realizing the refrigeration of the tank box.

[0068] The refrigeration system of the embodiment of the present application cools the refrigerant by providing a cooling unit 30, and uses a detection unit 40 and a control unit 50 to monitor and adjust the refrigerant temperature in real time, so that the refrigerant can selectively enter the cooling pipeline 31 for cooling or enter the heat exchange pipeline 21 to cool the tank box, thereby effectively preventing the refrigerant from being over-evaporated in the evaporator 13 due to the refrigerant temperature being too high, and preventing the refrigeration system from being unable to operate normally due to excessive compression working pressure of the compressor 11; and effectively reducing the impact of the high refrigerant temperature on the system, avoiding the increase in system load due to the high refrigerant temperature, and ensuring the normal operation of the system.

[0069] like Figure 1 As shown, in one embodiment, the refrigeration system may further include a driving pump 22, which may be connected to the pipeline on the coolant inlet side of the evaporator 13. The driving pump 22 is used to drive the flow of the coolant, so that the coolant in the cooling pipeline 31 or the heat exchange pipeline 21 continuously enters the evaporator 13 to circulate, thereby ensuring the circulating cooling of the coolant or the continuous cooling of the tank by the coolant.

[0070] It should be noted that when the refrigerant temperature in the refrigeration system is too low, the pressure in the refrigeration system pipeline will decrease, resulting in a decrease in the evaporation temperature of the refrigerant in the evaporator 13. The refrigerant absorbs insufficient heat, which will affect the refrigeration effect of the coolant on the tank box.

[0071] Therefore, see Figure 1 As shown, in one embodiment of the present application, the refrigeration system further includes a regulating valve 15 and a pressure detection device 16. The regulating valve 15 is arranged on the circulation pipeline 14 and is used to connect the compressor 11 and the evaporator 13. The pressure detection device 16 is used to detect the pressure of the circulation pipeline 14. The regulating valve 15 is electrically connected to the pressure detection device 16 and is used to open or close according to the pressure detection signal of the pressure detection device 16.

[0072] For example, when the pressure detection device 16 detects that the pressure in the circulation pipeline 14 is too low, it can control the regulating valve 15 to open, so that the refrigerant at the outlet of the compressor 11 can directly enter the evaporator 13, so that the refrigerant does not pass through the condenser 12. In this way, the amount of refrigerant entering the condenser 12 can be reduced by the pressure detection device 16 and the regulating valve 15 to prevent the refrigerant temperature from further decreasing, thereby effectively preventing the pressure in the circulation pipeline 14 from further decreasing, which is conducive to ensuring the overall refrigeration effect.

[0073] When the refrigerant temperature is too high and the pressure in the circulation pipeline 14 is too high, the pressure detection device 16 can control the regulating valve 15 to close, so that the refrigerant can flow into the condenser 12 normally for condensation and heat release.

[0074] In other embodiments, the pressure in the circulation pipeline 14 may be detected by a pressure sensor disposed on the circulation pipeline 14. The controller 51 may be electrically connected to both the pressure sensor and the regulating valve 15. When the pressure sensor detects that the pressure in the circulation pipeline 14 is too low, the controller 51 controls the regulating valve 15 to open.

[0075] See also Figure 1 In one embodiment, the refrigeration unit 10 further includes a condensing fan 17, and the condensing fan 17 is arranged corresponding to the condenser 12. There may be multiple condensing fans 17. Each condensing fan 17 can take away the heat released by the condenser 12, thereby improving the heat dissipation effect of the refrigerant in the condenser 12 and improving the condensation effect.

[0076] For example, the controller 51 is electrically connected to the pressure detection device 16 and the condensing fan 17, and the controller 51 is used to control the start or stop of the condensing fan 17 according to the pressure detection signal of the pressure detection device 16. When the refrigerant temperature is too low, the pressure in the circulation pipeline 14 will be too low, and the pressure detection device 16 will send the detected pressure signal to the controller 51. The controller 51 can determine that the pressure in the circulation pipeline 14 is too low, and it can control all or part of the condensing fans 17 to stop rotating, so as to avoid further reduction of the refrigerant temperature and further reduction of the pressure in the circulation pipeline 14.

[0077] When the refrigerant temperature is too high, the pressure in the circulation pipeline 14 will be too high. At this time, the pressure detection device 16 can control the regulating valve 15 to close. At the same time, the pressure detection device 16 sends the detected pressure signal to the controller 51, and the controller 51 can determine that the pressure in the circulation pipeline 14 is too high, and can control all condensing fans 17 to start, so as to increase the condensation and heat dissipation effect of the condenser 12, thereby avoiding excessive pressure in the circulation pipeline 14.

[0078] The refrigeration system of the embodiment of the present application can accurately control the flow rate of the refrigerant according to the pressure change in the circulation pipeline 14 by providing a regulating valve 15 and a pressure detection device 16, so as to avoid too low pipeline pressure caused by too low refrigerant temperature, thereby ensuring that the refrigerant absorbs heat normally in the evaporator 13 and ensuring the cooling effect of the coolant on the tank box.

[0079] In the present application, by adding a cooling unit 30 capable of cooling the refrigerant, and by intelligently controlling the refrigerant temperature through the detection unit 40 and the control unit 50, the problem of the refrigerant temperature being too high in the refrigeration system can be effectively avoided. In addition, the flow of the refrigerant entering the condenser 12 can be adjusted by the pressure detection device 16 and the regulating valve 15, which effectively avoids the problem of the refrigerant temperature being too low in the refrigeration system. Therefore, the present application effectively broadens the refrigeration temperature range of the refrigeration system, so that when the refrigerant temperature is too high or too low, the refrigeration system can adaptively prevent the refrigerant from being further too high or too low, thereby ensuring the normal operation of the refrigeration system and guaranteeing the refrigeration effect of the refrigeration system.

[0080] See also Figure 3 and Figure 4 One embodiment of the present invention further provides a method for controlling a refrigeration system of a tank container, comprising:

[0081] S10, collecting the temperature of the brine outputted by the evaporator 13. For example, the temperature of the brine may be collected by a temperature sensor 41 disposed on a pipeline at a side of the brine outlet of the evaporator 13.

[0082] S20, comparing the temperature of the coolant with the preset temperature to determine whether the temperature of the coolant is within the preset temperature. For example, the controller 51 may obtain a temperature detection signal of the temperature sensor 41 and compare and determine the temperature with the preset temperature.

[0083] S30, if the temperature of the coolant is greater than the preset temperature, the control valve 52 is controlled to connect the cooling pipeline 31, so that the coolant is cooled in the cooling unit 30. For example, Figure 1 As shown, the control valve 52 may be a three-way valve. When the controller 51 determines that the temperature of the coolant is greater than the preset temperature, it may control the interface 52c of the three-way valve to close and the interface 52b to open, so that the coolant can enter the cooling pipeline 31 for circulating cooling.

[0084] S40, if the temperature of the coolant is less than or equal to the preset temperature, the control valve 52 is controlled to connect the heat exchange pipeline 21, so that the coolant and the refrigerant exchange heat in the evaporator 13 to cool the medium in the tank. Figure 1As shown, when the controller 51 determines that the temperature of the coolant is less than or equal to the preset temperature, it can control the interface 52c of the three-way valve to open and the interface 52b to close, so that the coolant can normally enter the heat exchange pipeline 21 to exchange heat with the refrigerant in the evaporator 13, thereby realizing refrigeration of the tank box.

[0085] It should be noted that, in the present application, the preset temperature is not an absolute value, but a temperature threshold. That is, when the temperature of the coolant is higher than a certain temperature threshold, the control valve 52 can be controlled to connect the cooling pipeline 31.

[0086] See also Figure 5 One embodiment of the present invention further provides a method for controlling a refrigeration system of a tank container, comprising:

[0087] S100 , collecting pressure data of the circulation pipeline 14 . For example, the pressure data of the circulation pipeline 14 may be collected by the pressure detection device 16 .

[0088] S200, compare the pressure of the circulation pipeline 14 with the preset pressure, and if the pressure of the circulation pipeline 14 is lower than the preset pressure, control the regulating valve 15 to open. For example, when the pressure detection device 16 detects that the pressure in the circulation pipeline 14 is too low, for example, lower than the preset pressure, it can directly control the regulating valve 15 to open. In this way, the refrigerant at the outlet of the compressor 11 can directly enter the evaporator 13, so that the refrigerant does not pass through the condenser 12, avoids the refrigerant temperature from further decreasing, effectively prevents the pressure in the circulation pipeline 14 from further decreasing, and is conducive to ensuring the overall refrigeration effect.

[0089] It can be understood that when the pressure detection device 16 detects that the pressure in the circulation pipeline 14 is too high, for example, higher than the preset pressure, it can directly control the regulating valve 15 to close. Thus, the refrigerant at the outlet of the compressor 11 can flow normally into the condenser 12 for condensation and heat release, and the pressure in the circulation pipeline 14 is prevented from further increasing.

[0090] It should be noted that in the present application, the preset pressure is not an absolute value, but a pressure range. That is, when the pressure in the circulation pipeline 14 is lower than a certain pressure range, the regulating valve 15 can be controlled to open. The refrigeration system and control method of the tank container of the embodiment of the present application, by adding a cooling unit capable of cooling the refrigerant, and by intelligently controlling the refrigerant temperature through the detection unit and the control unit, can effectively prevent the refrigerant from being overly evaporated in the evaporator due to the high refrigerant temperature, and avoid the refrigeration system from being unable to operate normally due to excessive compression working pressure of the compressor.

[0091] The refrigeration system of the tank container and the control method thereof of the embodiment of the present application cools the refrigerant through the cooling unit, and the cooled refrigerant exchanges heat with the refrigerant to effectively reduce the refrigerant temperature. This can reduce the impact of the high refrigerant temperature on the refrigeration system, prevent the refrigeration system load from being increased due to the high refrigerant temperature, and ensure the normal operation of the refrigeration system.

[0092] The refrigeration system of the tank container and the control method thereof of the embodiment of the present application can adjust the flow rate of the refrigerant entering the condenser through the pressure detection device and the regulating valve, thereby preventing the refrigerant temperature from further decreasing, thereby effectively preventing the pressure in the circulation pipeline from further decreasing, ensuring that the refrigerant can absorb heat normally in the evaporator, and ensuring the refrigeration effect of the coolant on the tank container.

[0093] The refrigeration system of the tank container of the embodiment of the present application and the control method thereof, through a two-way temperature protection mechanism, not only protects the refrigeration system from the influence of excessively high refrigerant temperature, but also prevents the reduction of refrigeration efficiency caused by excessively low refrigerant temperature. This effectively broadens the operating temperature range of the refrigeration system, so that when the refrigerant temperature is too high or too low, the refrigeration system can adaptively prevent the refrigerant from further being too high or too low, thereby effectively protecting the refrigeration system from the influence of refrigerant temperature fluctuations, and improving the overall refrigeration effect and system safety of the refrigeration system.

[0094] The above embodiments are merely exemplary descriptions of the structures. The structures in the embodiments are not fixed combination structures. In the absence of structural conflicts, the structures in multiple embodiments can be used in any combination.

[0095] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A refrigeration system for a tank container, characterized in that: include: A refrigeration unit, comprising a compressor, a condenser and an evaporator, and a circulation pipeline connecting the compressor, the condenser and the evaporator, wherein the circulation pipeline is filled with a refrigerant, the refrigerant releases heat in the condenser and absorbs heat in the evaporator; A heat exchange unit, comprising a heat exchange pipeline, the heat exchange pipeline is connected to a refrigeration pipe on the tank and is connected to the evaporator, the heat exchange pipeline is filled with a coolant, and the coolant is used to bring the heat of the tank into the evaporator; A cooling unit, comprising a cooling pipeline and a cooling device, wherein the cooling pipeline is connected to the evaporator, and the cooling device is used to cool the coolant in the cooling pipeline, and the coolant enters the evaporator after being cooled by the cooling device; A detection unit, which is arranged on the heat exchange pipeline, and is used to detect the temperature of the coolant; A control unit includes a controller and a control valve, wherein the controller is electrically connected to the detection unit and the control valve, the control valve is used to control the coolant to enter the cooling pipeline or the heat exchange pipeline, and the controller is used to control the control valve to connect the cooling pipeline or the heat exchange pipeline according to the temperature detection signal of the detection unit.

2. The refrigeration system for a tank container according to claim 1, characterized in that: The control valve is a three-way valve, one of the interfaces of the three-way valve is connected to the refrigerant outlet of the evaporator, and the other two interfaces of the three-way valve are respectively connected to the cooling pipeline and the heat exchange pipeline, so that the refrigerant output by the evaporator can selectively enter the cooling pipeline for cooling or enter the heat exchange pipeline to refrigerate the tank box.

3. The refrigeration system for a tank container according to claim 1, characterized in that: The detection unit includes a temperature sensor, and the temperature sensor is arranged on a pipeline on one side of the refrigerant outlet of the evaporator; The controller is electrically connected to the temperature sensor, and is used to control the control valve to connect the cooling pipeline or the heat exchange pipeline according to a temperature detection signal from the temperature sensor.

4. The refrigeration system for a tank container according to claim 1, characterized in that: The cooling device comprises a cooling box, part of the cooling pipeline is arranged in the cooling box, a cooling medium is stored in the cooling box, and the cooling medium is used to cool the coolant in the cooling pipeline; and / or The cooling device includes a cooling fan, which is arranged corresponding to the cooling pipeline and is used to air-cool the coolant in the cooling pipeline.

5. The refrigeration system for a tank container according to claim 1, characterized in that: It also includes a pressure relief device, which is arranged on the cooling pipeline and / or the heat exchange pipeline, and is used to balance the internal and external pressure difference of the cooling pipeline and / or the heat exchange pipeline.

6. The refrigeration system for a tank container according to claim 1, characterized in that: It also includes a driving pump, which is arranged on a pipeline on one side of the refrigerant inlet of the evaporator, and is used to drive the flow of the refrigerant.

7. The refrigeration system for a tank container according to any one of claims 1 to 6, characterized in that: It also includes a regulating valve and a pressure detection device, wherein the regulating valve is arranged on the circulation pipeline and is used to connect the compressor and the evaporator, and the pressure detection device is used to detect the pressure of the circulation pipeline; The regulating valve is electrically connected to the pressure detection device, and the regulating valve is used to open or close according to a pressure detection signal from the pressure detection device.

8. The refrigeration system for a tank container according to claim 7, characterized in that: The refrigeration unit further comprises a condensing fan, and the condensing fan is arranged corresponding to the condenser; The controller is electrically connected to the pressure detection device and the condensing fan, and the controller is used to control the start or stop of the condensing fan according to the pressure detection signal of the pressure detection device.

9. A method for controlling a refrigeration system of a tank container according to any one of claims 1 to 8, characterized in that: include: Collecting the temperature of the coolant output by the evaporator; Compare the temperature of the coolant with the preset temperature to determine whether the temperature of the coolant is within the preset temperature; If the temperature of the coolant is greater than a preset temperature, the control valve is controlled to connect the cooling pipeline so that the coolant is cooled in the cooling unit; If the temperature of the coolant is less than or equal to the preset temperature, the control valve is controlled to connect the heat exchange pipeline, so that the coolant and the refrigerant exchange heat in the evaporator to cool the medium in the tank.

10. A method for controlling a refrigeration system of a tank container according to any one of claims 7 to 8, characterized in that: include: Collecting pressure data of the circulation pipeline; The pressure of the circulation pipeline is compared with the preset pressure. If the pressure of the circulation pipeline is lower than the preset pressure, the regulating valve is controlled to open.

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