Heat exchange system, control method and device thereof, electric appliance and computer device

Abstract

The application provides a heat exchange system and a control method, device, electrical equipment and computer equipment thereof, wherein the control method of the heat exchange system comprises the following steps: entering a defrosting mode in response to a defrosting instruction; in the defrosting mode, adjusting the frequency of a compressor according to the indoor environment temperature, so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor environment temperature; adjusting the opening degree of an expansion valve according to the indoor environment temperature, so that the refrigerant passing through the expansion valve meets the defrosting demand; and exiting the defrosting mode after the first condition is met. The control method of the heat exchange system provided by the application cancels the electric heating element, thereby reducing the power consumption in the defrosting process, and since the evaporator still operates in the refrigeration mode in the defrosting process, the temperature rise of the evaporator can be effectively controlled, the temperature difference between the evaporator and the original refrigeration temperature is reduced, the refrigeration effect is improved, for the refrigerator, the influence on the temperature of the compartment can be reduced, and the preservation effect on the food is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange systems, in particular to a control method of a heat exchange system, a control device of a heat exchange system, a heat exchange system, an electrical appliance, a computer device and a readable storage medium. BACKGROUND

[0002] In the related art, the defrosting of the traditional air-cooled variable frequency frost-free refrigerator uses electric heating or reverse circulation method to remove the frost on the evaporator. These defrosting methods not only have high power and high energy consumption, but also have a large temperature difference in the freezing compartment during the defrosting process, which has a great impact on the low temperature of the compartment, and the temperature can be increased by 20℃, which has a great influence on food preservation. Experiments show that the preservation period will be shortened by about 18% under the impact of a temperature difference of 20℃. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the prior art that the defrosting by electric heating or reverse circulation leads to poor temperature control.

[0004] To this end, a first aspect of the present application provides a control method of a heat exchange system.

[0005] A second aspect of the present application provides a control device of a heat exchange system.

[0006] A third aspect of the present application provides a heat exchange system.

[0007] A fourth aspect of the present application provides an electrical appliance.

[0008] A fifth aspect of the present application provides a computer device.

[0009] A sixth aspect of the present application provides a readable storage medium.

[0010] Therefore, according to the first aspect of the present application, a control method of a heat exchange system is provided, comprising: entering a defrosting mode in response to a defrosting instruction; in the defrosting mode, adjusting the frequency of the compressor according to the indoor environment temperature, so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor environment temperature; adjusting the opening degree of the expansion valve according to the indoor environment temperature, so that the refrigerant passing through the expansion valve meets the defrosting demand; and exiting the defrosting mode after the first condition is met.

[0011] The heat exchange system control method proposed in this invention enters a defrost mode when defrosting is required. In defrost mode, the compressor frequency is adjusted according to the indoor ambient temperature so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor ambient temperature. Consequently, the refrigerant and the indoor ambient temperature are the same in the condenser. Therefore, the refrigerant enters the subcooling pipe from the condenser without heat exchange. At the same time, the opening of the expansion valve on the subcooling pipe is adjusted according to the indoor ambient temperature to control the temperature of the refrigerant entering the evaporator, ensuring it meets the defrosting requirements. After the refrigerant passes through the expansion valve, its temperature decreases. Since the temperature of the refrigerant before passing through the expansion valve is the indoor ambient temperature, the temperature of the refrigerant entering the evaporator can be lower than the indoor ambient temperature. By adjusting the expansion valve, the refrigerant meets the defrosting requirements, thereby achieving defrosting of the evaporator and its inlet pipe. Furthermore, when the refrigerant flows out of the evaporator and into the return pipe, the temperature of the evaporator is lower than the indoor ambient temperature, allowing it to absorb heat from the indoor environment or the subcooling pipe before entering the compressor for circulation. After meeting the first condition, the defrost mode is exited.

[0012] The above methods do not require refrigerant to circulate in reverse and eliminate the electric heating element, thereby reducing the power consumption of the defrosting process. Furthermore, since the evaporator still operates in cooling mode during defrosting, the temperature rise of the evaporator can be effectively controlled, reducing the temperature difference between the evaporator and the original cooling temperature, and improving the cooling effect. For refrigerators, this can reduce the impact on the compartment temperature and improve the preservation effect of food.

[0013] In addition, the control method for the heat exchange system in the above-described technical solution provided by the present invention may also have the following additional technical features:

[0014] Based on the above technical solution, the further step of adjusting the compressor frequency according to the indoor ambient temperature so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor ambient temperature specifically includes: obtaining the indoor ambient temperature, calculating the target pressure of the refrigerant when the saturation temperature of the refrigerant is equal to the indoor ambient temperature; and adjusting the compressor frequency so that the pressure of the refrigerant discharged by the compressor is equal to the target pressure.

[0015] In this technical solution, the step of adjusting the compressor frequency according to the indoor ambient temperature so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor ambient temperature specifically includes: obtaining the indoor ambient temperature, calculating the target pressure that the refrigerant should be at under the indoor ambient temperature based on the characteristics of the refrigerant, and adjusting the compressor frequency so that the pressure of the refrigerant discharged by the compressor is equal to the target pressure.

[0016] Specifically, the saturation temperature of refrigerant is different under different pressures. Therefore, based on this characteristic, the temperature of the refrigerant discharged by the compressor can be equal to the indoor ambient temperature.

[0017] On the basis of any of the preceding technical solutions, further, the step of adjusting the frequency of the compressor so that the pressure of the refrigerant discharged by the compressor is equal to the target pressure specifically comprises: obtaining the current pressure of the refrigerant discharged by the compressor; and adjusting the frequency of the compressor according to the size relationship between the current pressure and the target pressure, so that the current pressure is equal to the target pressure.

[0018] In this technical solution, the step of adjusting the frequency of the compressor so that the pressure of the refrigerant discharged by the compressor is equal to the target pressure specifically comprises: obtaining the current pressure of the refrigerant discharged by the compressor; and adjusting the frequency of the compressor according to the size relationship between the current pressure and the target pressure, so that the current pressure is equal to the target pressure, and further adjusting the frequency of the compressor in a feedback manner, which can improve the accuracy of refrigerant pressure adjustment, and this adjustment manner can form dynamic adjustment, thereby improving the reliability of defrosting operation.

[0019] On the basis of any of the preceding technical solutions, further, the step of adjusting the opening degree of the expansion valve so that the refrigerant passing through the expansion valve meets the defrosting requirement according to the indoor environment temperature specifically comprises: calculating a target temperature according to the indoor environment temperature and a preset temperature difference, the target temperature being lower than the indoor environment temperature; and adjusting the opening degree of the expansion valve so that the temperature of the refrigerant passing through the expansion valve is equal to the target temperature.

[0020] In this technical solution, the step of adjusting the opening degree of the expansion valve so that the refrigerant passing through the expansion valve meets the defrosting requirement according to the indoor environment temperature specifically comprises: calculating a target temperature according to the indoor environment temperature and a preset temperature difference, the target temperature being lower than the indoor environment temperature; and adjusting the opening degree of the expansion valve so that the temperature of the refrigerant passing through the expansion valve is equal to the target temperature, so that the refrigerant at the target temperature enters the evaporator to defrost, and the preset temperature difference can ensure that the temperature of the refrigerant for defrosting meets the defrosting requirement, thereby ensuring the defrosting effect.

[0021] On the basis of any of the preceding technical solutions, further, the step of adjusting the opening degree of the expansion valve so that the temperature of the refrigerant passing through the expansion valve is equal to the target temperature specifically comprises: obtaining the current temperature of the refrigerant passing through the expansion valve; and adjusting the opening degree of the expansion valve according to the size relationship between the current temperature and the target temperature, so that the current temperature is equal to the target temperature.

[0022] In the technical solution, the step of adjusting the opening of the expansion valve to make the temperature of the refrigerant passing through the expansion valve equal to the target temperature specifically comprises: obtaining the current temperature of the refrigerant passing through the expansion valve, comparing the size relationship between the current temperature and the target temperature, and adjusting the opening of the expansion valve according to the size relationship between the current temperature and the target temperature, so that the current temperature and the target temperature are equal, and the opening of the expansion valve is adjusted in a feedback manner, which can improve the accuracy of the temperature adjustment of the refrigerant, and the adjustment manner can form dynamic adjustment, thereby improving the reliability of the defrosting operation.

[0023] On the basis of any of the above technical solutions, further, the preset temperature difference is greater than 0℃ and less than or equal to 5℃.

[0024] In the technical solution, the preset temperature difference is greater than 0℃ and less than or equal to 10℃, so that the temperature of the refrigerant entering the evaporator is slightly lower than the indoor environment temperature, thereby improving the defrosting effect, and reducing the temperature difference of the refrigerant, which helps to reduce the power consumption of the compressor.

[0025] On the basis of any of the above technical solutions, further, after the first condition is met, the step of exiting the defrosting mode specifically comprises: after the running time of the heat exchange system in the defrosting mode reaches a preset time, the defrosting mode is exited.

[0026] In the technical solution, after the first condition is met, the step of exiting the defrosting mode specifically comprises: after the running time of the heat exchange system in the defrosting mode reaches a preset time, the defrosting mode is exited, and the heat exchange system returns to the original working mode, thereby reducing the influence of long-time defrosting mode operation on the temperature.

[0027] On the basis of any of the above technical solutions, further, after the first condition is met, the step of exiting the defrosting mode specifically comprises: in the case that the temperature of the inlet pipe of the evaporator reaches a preset temperature, the defrosting mode is exited.

[0028] In the technical solution, after the first condition is met, the step of exiting the defrosting mode specifically comprises: in the case that the temperature of the inlet pipe of the evaporator reaches a preset temperature, the defrosting mode is exited. This improves the temperature adjustment effect of the heat exchange system.

[0029] On the basis of any of the above technical solutions, further, the preset temperature is greater than 0℃ and less than or equal to 10℃.

[0030] In the technical solution, after the inlet pipe of the evaporator is frosted, its temperature is usually below zero, so that when the temperature reaches above 0℃, defrosting can be realized, and if the preset temperature is too high, it will affect the heat exchange effect, therefore, setting the range of 0℃ to 10℃ can ensure the defrosting effect while reducing the influence on the heat exchange effect.

[0031] According to a second aspect of the present application, the present application provides a control device of a heat exchange system, comprising: a response module, configured to enter a defrosting mode in response to a defrosting instruction; a first adjusting module, configured to adjust a frequency of a compressor in the defrosting mode according to an indoor environment temperature, so that a saturation temperature of refrigerant discharged by the compressor is equal to the indoor environment temperature; a second adjusting module, configured to adjust an opening degree of an expansion valve according to the indoor environment temperature, so that the refrigerant passing through the expansion valve meets a defrosting requirement; and a first exiting module, configured to exit the defrosting mode after a first condition is met.

[0032] The control device of the heat exchange system provided by the present application enters the defrosting mode when defrosting is needed, adjusts the frequency of the compressor according to the indoor environment temperature in the defrosting mode, so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor environment temperature, and thus the refrigerant and the indoor environment temperature are the same in the condenser, the refrigerant enters the supercooling pipe without heat exchange in the condenser, and the opening degree of the expansion valve on the supercooling pipe is adjusted according to the indoor environment temperature, so that the temperature of the refrigerant entering the evaporator meets the defrosting requirement, the temperature of the refrigerant after passing through the expansion valve is reduced, and the temperature of the refrigerant before passing through the expansion valve is the indoor environment temperature, so that the temperature of the refrigerant entering the evaporator can be lower than the indoor environment temperature, the refrigerant meets the defrosting requirement by adjusting the expansion valve, defrosting of the evaporator and the inlet pipe of the evaporator is realized, the temperature of the evaporator is lower than the indoor environment temperature when the refrigerant flows out of the evaporator and enters the return pipe, so that the evaporator can absorb heat from the indoor environment or the supercooling pipe, and then enters the compressor to circulate, and the defrosting mode is exited after the first condition is met.

[0033] The above method does not need to make the refrigerant circulate reversely, and cancels the electric heating element, so that the power consumption of the defrosting process is reduced, and the temperature rise of the evaporator can be effectively controlled because the evaporator still operates in the refrigeration mode during the defrosting process, the temperature difference between the evaporator and the original refrigeration temperature is reduced, and the refrigeration effect is improved, the influence on the temperature of the compartment of the refrigerator is reduced, and the preservation effect of food is improved.

[0034] On the basis of the above technical solution, further, the first adjusting module comprises: a first calculating module, configured to obtain the indoor environment temperature, calculate the target pressure of the refrigerant when the saturation temperature of the refrigerant is equal to the indoor environment temperature; and a third adjusting module, configured to adjust the frequency of the compressor, so that the pressure of the refrigerant discharged by the compressor is equal to the target pressure.

[0035] In the technical solution, the first adjusting module comprises the first calculating module and the third adjusting module, specifically, the indoor environment temperature is obtained, the target pressure of the refrigerant when the saturation temperature of the refrigerant is equal to the indoor environment temperature is calculated according to the characteristics of the refrigerant, and the frequency of the compressor is adjusted, so that the pressure of the refrigerant discharged by the compressor is equal to the target pressure.

[0036] Specifically, the saturation temperature of the refrigerant at different pressures is different, and therefore, based on this characteristic, the temperature of the refrigerant discharged by the compressor can be equal to the indoor environment temperature.

[0037] On the basis of any of the above technical solutions, further, the third adjusting module comprises: a first obtaining module, configured to obtain the current pressure of the refrigerant discharged by the compressor; and a fourth adjusting module, configured to adjust the frequency of the compressor according to the size relationship between the current pressure and the target pressure, so that the current pressure is equal to the target pressure.

[0038] In this technical solution, the third adjusting module comprises the first obtaining module and the fourth adjusting module, specifically, the current pressure of the refrigerant discharged by the compressor is obtained, and the frequency of the compressor is adjusted according to the size relationship between the current pressure and the target pressure, so that the current pressure is equal to the target pressure, and the frequency of the compressor is adjusted in a feedback manner, which can improve the accuracy of the refrigerant pressure adjustment, and this adjustment manner can form dynamic adjustment, improving the reliability of defrosting operation.

[0039] On the basis of any of the above technical solutions, further, the second adjusting module comprises: a second calculating module, configured to calculate a target temperature according to the indoor environment temperature and a preset temperature difference, the target temperature being lower than the indoor environment temperature; and a fifth adjusting module, configured to adjust the opening degree of the expansion valve, so that the temperature of the refrigerant passing through the expansion valve is equal to the target temperature.

[0040] In this technical solution, the second adjusting module comprises the second calculating module and the fifth adjusting module, specifically, the target temperature is calculated according to the indoor environment temperature and a preset temperature difference, and the temperature of the refrigerant meeting the defrosting requirement is calculated according to the preset temperature difference, specifically, the target temperature can be obtained by subtracting the preset temperature difference from the indoor environment temperature, and the opening degree of the expansion valve is adjusted based on the target temperature, so that the temperature of the refrigerant passing through the expansion valve is equal to the target temperature, and the refrigerant at the target temperature enters the evaporator for defrosting, and the preset temperature difference can ensure that the temperature of the refrigerant for defrosting meets the defrosting requirement, ensuring the defrosting effect.

[0041] On the basis of any of the above technical solutions, further, the fifth adjusting module comprises: a second obtaining module, configured to obtain the current temperature of the refrigerant passing through the expansion valve; and a sixth adjusting module, configured to adjust the opening degree of the expansion valve according to the size relationship between the current temperature and the target temperature, so that the current temperature is equal to the target temperature.

[0042] In the technical solution, the fifth adjusting module comprises a second obtaining module and a sixth adjusting module, specifically, the current temperature of the refrigerant passing through the expansion valve is obtained, the size relationship between the current temperature and the target temperature is compared, and the opening degree of the expansion valve is adjusted according to the size relationship between the current temperature and the target temperature, so that the current temperature is equal to the target temperature, and then the opening degree of the expansion valve is adjusted by using the feedback mode, which can improve the accuracy of the temperature adjustment of the refrigerant, and the adjusting mode can form dynamic adjustment, thereby improving the reliability of the defrosting operation.

[0043] On the basis of any of the above technical solutions, further, the preset temperature difference is greater than 0 DEG C and less than or equal to 5 DEG C.

[0044] In the technical solution, the preset temperature difference is greater than 0 DEG C and less than or equal to 10 DEG C, so that the temperature of the refrigerant entering the evaporator is slightly lower than the indoor environment temperature, thereby improving the defrosting effect, and reducing the temperature difference of the refrigerant, which helps to reduce the power consumption of the compressor.

[0045] On the basis of any of the above technical solutions, further, the first exiting module comprises a second exiting module for exiting the defrosting mode when the running time of the heat exchange system in the defrosting mode reaches a preset time.

[0046] In the technical solution, the first exiting module comprises a second exiting module, specifically, the defrosting mode is exited when the running time of the heat exchange system in the defrosting mode reaches a preset time, and the heat exchange system returns to the original working mode, thereby reducing the influence of long-time defrosting mode operation on temperature.

[0047] On the basis of any of the above technical solutions, further, the first exiting module comprises a third exiting module for exiting the defrosting mode when the temperature of the inlet pipe of the evaporator reaches a preset temperature.

[0048] In the technical solution, the first exiting module comprises a third exiting module when the first condition is met, specifically, the defrosting mode is exited when the temperature of the inlet pipe of the evaporator reaches a preset temperature, which means that the defrosting has been completed. Therefore, the temperature adjusting effect of the heat exchange system is improved.

[0049] On the basis of any of the above technical solutions, further, the preset temperature is greater than 0 DEG C and less than or equal to 10 DEG C.

[0050] In the technical solution, when the inlet pipe of the evaporator is frosted, its temperature is usually below zero, and when the temperature reaches above 0 DEG C, defrosting can be realized. If the preset temperature is too high, the heat exchange effect will be affected. Therefore, by setting the range of 0 DEG C to 10 DEG C, the defrosting effect can be ensured while reducing the influence on the heat exchange effect.

[0051] According to a third aspect of the present application, the present application provides a heat exchange system, comprising: a compressor, an exhaust pipe, a condenser, a supercooling pipe, an expansion valve arranged on the supercooling pipe, an evaporator and a return pipe connected to form a heat exchange loop; a pressure sensor arranged on the exhaust pipe and used for detecting the pressure of refrigerant output by the compressor; a first temperature sensor arranged on the supercooling pipe and used for detecting the temperature of refrigerant passing through the expansion valve; and a controller electrically connected with the compressor, the expansion valve, the pressure sensor and the first temperature sensor and used for executing the control method of the heat exchange system according to any one of the above technical solutions.

[0052] The heat exchange system according to the present application has all the beneficial effects of the control method of the heat exchange system according to any one of the above technical solutions, which will not be repeated here.

[0053] Further, part of the supercooling pipe and part of the return pipe are welded and connected.

[0054] In this technical solution, part of the supercooling pipe and part of the return pipe are welded and connected, so that heat exchange can be performed between the two, thereby improving the heat exchange efficiency, and in the defrosting mode, the refrigerant in the return pipe can also exchange heat with the refrigerant in the supercooling pipe, thereby improving the defrosting effect and further reducing the power consumption.

[0055] According to a fourth aspect of the present application, the present application provides an electrical appliance, comprising: the control device of the heat exchange system according to any one of the above technical solutions; or the heat exchange system according to any one of the above technical solutions.

[0056] The electrical appliance according to the present application has all the beneficial effects of the control device of the heat exchange system according to any one of the above technical solutions; or the heat exchange system according to any one of the above technical solutions, which will not be repeated here.

[0057] According to a fifth aspect of the present application, the present application provides a computer device, comprising: a memory for storing a computer program; and a processor for executing the computer program to realize the steps of the control method of the heat exchange system according to any one of the above technical solutions.

[0058] The computer device according to the present application comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the steps of the control method of the heat exchange system according to any one of the above technical solutions, so that the computer device has all the beneficial effects of the control method of the heat exchange system according to any one of the above technical solutions, which will not be repeated here.

[0059] According to a sixth aspect of the present application, the present application provides a readable storage medium, wherein the readable storage medium stores a program or instructions, and the program or instructions are executed by a processor to implement the steps of the control method of the heat exchange system according to any one of the above technical solutions.

[0060] The readable storage medium according to the present application stores the program or instructions, and the program or instructions are executed by the processor to implement the steps of the control method of the heat exchange system according to any one of the above technical solutions, so that all the beneficial effects of the control method of the heat exchange system according to any one of the above technical solutions are achieved, which will not be repeated here.

[0061] Additional aspects and advantages of the present application will become apparent from the following description with reference to specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0062] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0063] Figure 1 Fig. 1 shows a structural schematic diagram of a heat exchange system according to an embodiment of the present application;

[0064] Figure 2 Fig. 2 shows a structural block diagram of electrical connection of components in a heat exchange system according to an embodiment of the present application;

[0065] Figure 3 Fig. 3 shows a flowchart of a control method of a heat exchange system according to an embodiment of the present application;

[0066] Figure 4 Fig. 4 shows a flowchart of a control method of a heat exchange system according to an embodiment of the present application;

[0067] Figure 5 Fig. 5 shows a flowchart of a control method of a heat exchange system according to an embodiment of the present application;

[0068] Figure 6 Fig. 6 shows a flowchart of a control method of a heat exchange system according to an embodiment of the present application;

[0069] Figure 7 Fig. 7 shows a structural block diagram of a control device of a heat exchange system according to an embodiment of the present application.

[0070] In the drawings, Figure 1 and Figure 2 The correspondence between the reference signs and the component names in the drawings is as follows:

[0071] 100 heat exchange system, 110 compressor, 120 exhaust pipe, 130 condenser, 140 subcooling pipe, 150 expansion valve, 160 evaporator, 170 gas return pipe, 180 pressure sensor, 190 first temperature sensor, 200 controller. DETAILED DESCRIPTION

[0072] In order to enable persons skilled in the art to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0073] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, however, the present application can also be implemented in other manners different from those described herein, and therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0074] The control method of a heat exchange system, the control device of a heat exchange system, the heat exchange system, the electrical appliance, the computer device and the readable storage medium according to some embodiments of the present application will be described below with reference to the accompanying drawings. Figures 1 to 7

[0075] Embodiment 1

[0076] Figure 3 One of the flowcharts of the control method of a heat exchange system provided by an embodiment of the present application is shown.

[0077] As shown in Figure 3 , the flowchart of the control method of a heat exchange system provided by an embodiment of the present application is as follows:

[0078] Step 302: When the heat exchange system is running, the controller controls the heat exchange system to enter a defrosting mode in response to a defrosting instruction;

[0079] Step 304: According to the indoor environment temperature detected by the second temperature sensor, the controller controls the compressor to adjust the operating frequency to adjust the saturation temperature of the refrigerant discharged by the compressor, so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor environment temperature;

[0080] Step 306: According to the indoor environment temperature, the controller controls the expansion valve to adjust the opening degree to change the temperature of the refrigerant passing through the expansion valve, so that the refrigerant passing through the expansion valve meets the defrosting requirement;

[0081] Step 308: After the controller detects that the running of the defrosting mode meets the first condition, the controller controls the heat exchange system to exit the defrosting mode.

[0082] In this embodiment, the control method of a heat exchange system is applied to a heat exchange system, specifically, as Figure 1 and​Figure 2 As shown, the heat exchange system includes: a compressor, a discharge pipe, a condenser, a subcooling pipe, an expansion valve, an evaporator, a return pipe, a pressure sensor, and a first temperature sensor. The pressure sensor is installed on the discharge pipe, thereby enabling it to detect the pressure of the refrigerant discharged by the compressor. The expansion valve is installed on the subcooling pipe, and the first temperature sensor is installed on the subcooling pipe, located between the expansion valve and the evaporator, thereby enabling it to detect the temperature of the refrigerant after it has expanded through the expansion valve.

[0083] Furthermore, the compressor, exhaust pipe, condenser, subcooling pipe, expansion valve, evaporator, and return pipe can form a heat exchange flow path in which the refrigerant can exchange heat.

[0084] In addition, the heat exchange system also includes a second temperature sensor, which is electrically connected to the controller to detect the indoor ambient temperature.

[0085] Specifically, when the heat exchange system is running, if a defrosting condition is triggered and a defrosting command is issued or received from the user, the controller responds to the defrosting command and controls the heat exchange system to operate in defrosting mode.

[0086] In defrost mode, the controller adjusts the compressor frequency based on the detection results of the second temperature sensor, so that the temperature of the refrigerant discharged by the compressor is equal to the indoor ambient temperature. Specifically, the compressor can compress the low-temperature, low-pressure superheated gaseous refrigerant into a high-temperature, high-pressure superheated gaseous refrigerant, and the saturation temperature of the high-temperature, high-pressure superheated gaseous refrigerant is the same as the indoor ambient temperature.

[0087] Afterwards, the high-temperature and high-pressure superheated gaseous refrigerant enters the condenser. At this time, the temperature of the high-temperature and high-pressure superheated gaseous refrigerant is the same as the indoor ambient temperature. Therefore, there is no phase change in the refrigerant and no heat exchange occurs.

[0088] Afterwards, the refrigerant flows out of the condenser in a saturated gaseous state and enters the subcooling pipe. The controller adjusts the opening of the expansion valve according to the indoor ambient temperature, thereby adjusting the temperature of the refrigerant to a suitable defrosting temperature. Then, the gaseous saturated refrigerant enters the evaporator and condenses and releases heat in the evaporator, thus achieving the defrosting effect.

[0089] Afterwards, the saturated subcooled liquid refrigerant flows out of the evaporator, enters the return pipe, and absorbs heat from the indoor environment and the subcooling pipe, evaporating into superheated gaseous refrigerant.

[0090] Then, the superheated gaseous refrigerant enters the compressor and is compressed to repeat the above process, thereby achieving a continuous defrosting effect.

[0091] After the heat exchange system is running in defrost mode and the first condition is met, the defrost mode of the control heat exchange system is exited.

[0092] The defrosting method above does not need to reverse the circulation of the refrigerant, and cancels the electric heating element, thereby reducing the power consumption of the defrosting process, and since the evaporator is still in the refrigeration mode during the defrosting process, the temperature rise of the evaporator can be effectively controlled, the temperature difference between the evaporator and the original refrigeration temperature is reduced, and the refrigeration effect is improved. For a refrigerator, the influence on the temperature of the compartment can be reduced, and the preservation effect of the food can be improved.

[0093] It should be noted that since errors cannot be avoided, the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor environment temperature, which can be understood as the saturation temperature of the refrigerant discharged by the compressor being close to the indoor environment temperature. Specifically, the error value can be ±1℃ or the like.

[0094] Embodiment 2:

[0095] Figure 4 Fig. 2 shows a flowchart of a control method of a heat exchange system according to an embodiment of the present application.

[0096] As shown in Figure 4 , the flowchart of the control method of the heat exchange system according to an embodiment of the present application is as follows:

[0097] Step 402: When the heat exchange system is running, the controller controls the heat exchange system to enter the defrosting mode in response to a defrosting instruction;

[0098] Step 404: The controller obtains the detection result of the second temperature sensor on the indoor environment temperature, and calculates the target pressure of the refrigerant when the saturation temperature of the refrigerant is equal to the indoor environment temperature;

[0099] Step 406: The controller adjusts the frequency of the compressor according to the target pressure, so that the pressure of the refrigerant discharged by the compressor is equal to the target pressure;

[0100] Step 408: According to the indoor environment temperature, the opening degree of the expansion valve is controlled to change the temperature of the refrigerant passing through the expansion valve, so that the refrigerant passing through the expansion valve meets the defrosting demand;

[0101] Step 410: After the controller detects that the running of the defrosting mode meets the first condition, the heat exchange system exits the defrosting mode.

[0102] In this embodiment, the control method of the heat exchange system is applied to the heat exchange system, specifically, as shown in Figure 1 and Figure 2As shown, the heat exchange system comprises a compressor, an exhaust pipe, a condenser, a supercooling pipe, an expansion valve, an evaporator, a return pipe, a pressure sensor and a first temperature sensor, wherein the pressure sensor is arranged on the exhaust pipe, so that the pressure sensor can detect the refrigerant pressure discharged by the compressor; the expansion valve is arranged on the supercooling pipe; and the first temperature sensor is arranged on the supercooling pipe and located between the expansion valve and the evaporator, so that the first temperature sensor can detect the temperature of the refrigerant after expansion by the expansion valve.

[0103] Further, the compressor, the exhaust pipe, the condenser, the supercooling pipe, the expansion valve, the evaporator and the return pipe can form a heat exchange flow path, in which the refrigerant can flow for heat exchange.

[0104] Further, the heat exchange system further comprises a second temperature sensor electrically connected with the controller, for detecting the indoor ambient temperature.

[0105] Specifically, when the heat exchange system is running, such as when a defrosting condition is triggered, a defrosting instruction is issued, or a defrosting instruction from a user is received, the controller controls the heat exchange system to run in a defrosting mode in response to the defrosting instruction.

[0106] In the defrosting mode, the controller acquires the detection result of the second temperature sensor, and calculates a target pressure corresponding to the refrigerant when the saturation temperature of the refrigerant is equal to the indoor ambient temperature according to the detection result and the saturation temperature of the refrigerant, and then adjusts the frequency of the compressor according to the target pressure, so that the refrigerant pressure discharged by the compressor is equal to the target pressure, thereby making the temperature of the refrigerant discharged by the compressor equal to the indoor ambient temperature, specifically, the compressor can compress the low-temperature and low-pressure superheated gaseous refrigerant into high-temperature and high-pressure superheated gaseous refrigerant, and the saturation temperature of the high-temperature and high-pressure superheated gaseous refrigerant is the same as the indoor ambient temperature.

[0107] Then, the high-temperature and high-pressure superheated gaseous refrigerant enters the condenser, at this time, the temperature of the high-temperature and high-pressure superheated gaseous refrigerant is the same as the indoor ambient temperature, so that the refrigerant does not change phase and does not exchange heat.

[0108] Then, the refrigerant flows out of the condenser in a saturated gaseous state, enters the supercooling pipe, and the controller adjusts the opening degree of the expansion valve according to the indoor ambient temperature, thereby adjusting the temperature of the refrigerant to a temperature suitable for defrosting, and then the gaseous saturated refrigerant releases heat in the evaporator after entering the evaporator, thereby achieving the defrosting effect.

[0109] Then, the saturated supercooled liquid refrigerant flows out of the evaporator, enters the return pipe, and absorbs heat from the indoor environment and the supercooling pipe, and evaporates into superheated gaseous refrigerant.

[0110] Then, the superheated gaseous refrigerant enters the compressor for compression to repeat the above process, thereby achieving a continuous defrosting effect.

[0111] And the heat exchange system to defrost mode to meet the first condition, exit control heat exchange system defrost mode.

[0112] The defrosting method above does not need to make the refrigerant reverse circulation, and cancels the electric heating element, thereby reducing the power consumption of the defrosting process, and since the evaporator is still in refrigeration mode during the defrosting process, the temperature rise of the evaporator can be effectively controlled, reducing the temperature difference between the evaporator and the original refrigeration temperature, improving the refrigeration effect. For the refrigerator, it can reduce the influence on the temperature of the compartment and improve the preservation effect of the food.

[0113] Specifically, the saturation temperature and pressure of the refrigerant correspond to the refrigerant characteristics. The following Table 1 and Table 2 illustrate the comparison between the saturation temperature and pressure of the refrigerant using isobutane R600a refrigerant as an example.

[0114] Table 1

[0115]

[0116] Table 2

[0117]

[0118] As shown in Table 1 above, the comparison data of the partial temperature saturation temperature and absolute pressure of isobutane R600a refrigerant at minus 1 degree Celsius to minus 50 degrees Celsius is shown.

[0119] As shown in Table 2 above, the comparison data of the partial saturation temperature and absolute pressure of isobutane R600a refrigerant at 0 degrees Celsius to 90 degrees Celsius is shown.

[0120] Wherein, the absolute pressure (MPa) -0.1 MPa (atmospheric pressure) = gauge pressure (MPa).

[0121] When using different refrigerants, only the corresponding saturation temperature and pressure comparison relationship needs to be adopted.

[0122] It should be noted that since errors cannot be avoided, the pressure of the refrigerant discharged by the compressor is equal to the target pressure, which can be understood as the pressure of the refrigerant discharged by the compressor is close to the target pressure. Specifically, the error value can be ±0.01 MPa, etc.

[0123] Example 3:

[0124] Figure 5 A flowchart of a control method of a heat exchange system provided by an embodiment of the present application is shown.

[0125] As Figure 5 shown, the flowchart of the control method of the heat exchange system provided by an embodiment of the present application is as follows:

[0126] Step 502: In response to the defrosting instruction, the controller controls the heat exchange system to enter the defrosting mode when the heat exchange system is running.

[0127] Step 504: According to the indoor environment temperature detected by the second temperature sensor, the controller controls the compressor to adjust the operating frequency to adjust the saturation temperature of the refrigerant discharged by the compressor, so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor environment temperature.

[0128] Step 506: The controller calculates the difference between the indoor environment temperature and the preset temperature difference, and determines the difference as the target temperature, wherein the target temperature is lower than the indoor environment temperature.

[0129] Step 508: The controller controls the expansion valve to adjust the opening degree, so that the temperature of the refrigerant passing through the expansion valve is equal to the target temperature.

[0130] Step 510: After the controller detects that the operation of the defrosting mode has met the first condition, the controller controls the heat exchange system to exit the defrosting mode.

[0131] In this embodiment, the control method of the heat exchange system is applied to the heat exchange system, specifically, as shown in Figure 1 and Figure 2 The heat exchange system comprises a compressor, an exhaust pipe, a condenser, a supercooling pipe, an expansion valve, an evaporator, a return pipe, a pressure sensor and a first temperature sensor, wherein the pressure sensor is arranged on the exhaust pipe, so that the pressure sensor can detect the pressure of the refrigerant discharged by the compressor, the expansion valve is arranged on the supercooling pipe, and the first temperature sensor is arranged on the supercooling pipe and located between the expansion valve and the evaporator, so that the first temperature sensor can detect the temperature of the refrigerant expanded by the expansion valve.

[0132] Moreover, the compressor, the exhaust pipe, the condenser, the supercooling pipe, the expansion valve, the evaporator and the return pipe can form a heat exchange flow path, and the refrigerant can flow in the heat exchange flow path.

[0133] Moreover, the heat exchange system further comprises a second temperature sensor, which is electrically connected with the controller and used to detect the indoor environment temperature.

[0134] Specifically, when the heat exchange system is running, such as triggering the defrosting condition, issuing the defrosting instruction, or receiving the defrosting instruction issued by the user, the controller controls the heat exchange system to run in the defrosting mode in response to the defrosting instruction.

[0135] In the defrosting mode, the controller adjusts the frequency of the compressor according to the detection result of the second temperature sensor, so that the temperature of the refrigerant discharged by the compressor is equal to the indoor environment temperature, specifically, the compressor can compress the low-temperature and low-pressure superheated gaseous refrigerant into high-temperature and high-pressure superheated gaseous refrigerant, and the saturation temperature of the high-temperature and high-pressure superheated gaseous refrigerant is the same as the indoor environment temperature.

[0136] After that, the high-temperature and high-pressure superheated gaseous refrigerant enters the condenser, at this time, the temperature of the high-temperature and high-pressure superheated gaseous refrigerant is the same as the indoor environment temperature, so that the refrigerant does not change phase and does not exchange heat.

[0137] After that, the refrigerant flows out of the condenser in a saturated gaseous state and enters the subcooling pipe, the controller subtracts the indoor environment temperature from the preset temperature difference to obtain a target temperature, wherein the preset temperature difference is positive, and controls the opening degree of the expansion valve, so that the temperature of the refrigerant after expansion through the expansion valve is equal to the target temperature, and gaseous saturated refrigerant is formed. After entering the evaporator, the gaseous saturated refrigerant condenses and releases heat in the evaporator, thereby achieving the defrosting effect.

[0138] After that, the saturated subcooled liquid refrigerant flows out of the evaporator and enters the gas return pipe, and absorbs heat from the indoor environment and the subcooling pipe, and evaporates into superheated gaseous refrigerant.

[0139] After that, the superheated gaseous refrigerant enters the compressor for compression to repeat the above process, thereby achieving a continuous defrosting effect.

[0140] And after the heat exchange system operates in the defrosting mode to meet the first condition, the control of the heat exchange system in the defrosting mode is exited.

[0141] The above defrosting method does not need to circulate the refrigerant in reverse, and cancels the electric heating element, thereby reducing the power consumption of the defrosting process. Since the evaporator still operates in the refrigeration mode during the defrosting process, the temperature rise of the evaporator can be effectively controlled, the temperature difference between the evaporator and the original refrigeration temperature is reduced, and the refrigeration effect is improved. For a refrigerator, the influence on the temperature of the compartment can be reduced, and the preservation effect of food can be improved.

[0142] It should be noted that since errors cannot be avoided, the temperature of the refrigerant passing through the expansion valve and the target temperature are equal, which can be understood as the temperature of the refrigerant passing through the expansion valve and the target temperature being similar. Specifically, the error value can be ±1℃, etc.

[0143] Embodiment 4:

[0144] Figure 6 Fig. 4 shows a flowchart of a control method of a heat exchange system according to an embodiment of the present application.

[0145] As Figure 6As shown, the flowchart of the control method of the heat exchange system provided by one embodiment of the present application is specifically as follows:

[0146] Step 602: When the heat exchange system is running, the controller controls the heat exchange system to enter the defrosting mode in response to the defrosting instruction.

[0147] Step 604: The controller acquires the detection result of the indoor environment temperature by the second temperature sensor, and calculates the target pressure of the refrigerant when the saturation temperature of the refrigerant is equal to the indoor environment temperature.

[0148] Step 606: The controller adjusts the frequency of the compressor according to the target pressure, so that the pressure of the refrigerant discharged by the compressor is equal to the target pressure.

[0149] Step 608: The controller calculates the difference between the indoor environment temperature and the preset temperature difference, and determines the difference as the target temperature, wherein the target temperature is lower than the indoor environment temperature.

[0150] Step 610: The controller controls the expansion valve to adjust the opening degree, so that the temperature of the refrigerant passing through the expansion valve is equal to the target temperature.

[0151] Step 612: After the controller detects that the running of the defrosting mode has met the first condition, the heat exchange system exits the defrosting mode.

[0152] In this embodiment, the control method of the heat exchange system is applied to the heat exchange system, specifically, as shown in Figure 1 and Figure 2 the heat exchange system comprises a compressor, an exhaust pipe, a condenser, a supercooling pipe, an expansion valve, an evaporator, a return pipe, a pressure sensor and a first temperature sensor, wherein the pressure sensor is arranged on the exhaust pipe, so that the pressure sensor can detect the pressure of the refrigerant discharged by the compressor, the expansion valve is arranged on the supercooling pipe, and the first temperature sensor is arranged on the supercooling pipe and located between the expansion valve and the evaporator, so that the first temperature sensor can detect the temperature of the refrigerant expanded by the expansion valve.

[0153] Moreover, the compressor, the exhaust pipe, the condenser, the supercooling pipe, the expansion valve, the evaporator and the return pipe can form a heat exchange flow path, and the refrigerant can flow in the heat exchange flow path for heat exchange.

[0154] Moreover, the heat exchange system further comprises a second temperature sensor, which is electrically connected with the controller and used for detecting the indoor environment temperature.

[0155] Specifically, when the heat exchange system is running, such as triggering the defrosting condition, issuing the defrosting instruction, or receiving the defrosting instruction issued by the user, the controller controls the heat exchange system to run in the defrosting mode in response to the defrosting instruction.

[0156] In the defrosting mode, the controller adjusts the frequency of the compressor according to the detection result of the second temperature sensor, so that the temperature of the refrigerant discharged by the compressor is equal to the indoor environment temperature, specifically, the compressor can compress the low-temperature and low-pressure superheated gaseous refrigerant into high-temperature and high-pressure superheated gaseous refrigerant, and the saturation temperature of the high-temperature and high-pressure superheated gaseous refrigerant is the same as the indoor environment temperature.

[0157] After that, the high-temperature and high-pressure superheated gaseous refrigerant enters the condenser, at this time, the temperature of the high-temperature and high-pressure superheated gaseous refrigerant is the same as the indoor environment temperature, so the refrigerant does not change phase and does not exchange heat.

[0158] After that, the refrigerant flows out of the condenser in a saturated gaseous state and enters the subcooling pipe, the controller subtracts the indoor environment temperature from the preset temperature difference to obtain a target temperature, wherein the preset temperature difference is positive, and controls the opening degree of the expansion valve so that the temperature of the refrigerant after expansion through the expansion valve is equal to the target temperature, and forms gaseous saturated refrigerant. The gaseous saturated refrigerant releases heat after entering the evaporator, thereby achieving the defrosting effect.

[0159] After that, the saturated subcooled liquid refrigerant flows out of the evaporator and enters the gas return pipe, and absorbs heat from the indoor environment and the subcooling pipe, and evaporates into superheated gaseous refrigerant.

[0160] After that, the superheated gaseous refrigerant enters the compressor for compression to repeat the above process, thereby achieving a continuous defrosting effect.

[0161] And after the heat exchange system runs in the defrosting mode to meet the first condition, the control of the heat exchange system defrosting mode is exited.

[0162] The above defrosting method does not need to circulate the refrigerant in reverse, and cancels the electric heating element, thereby reducing the power consumption of the defrosting process. Since the evaporator is still in refrigeration mode during the defrosting process, the temperature rise of the evaporator can be effectively controlled, the temperature difference between the evaporator and the original refrigeration temperature is reduced, and the refrigeration effect is improved. For a refrigerator, the influence on the temperature of the compartment can be reduced, and the preservation effect of food can be improved.

[0163] Example 5:

[0164] Further based on the embodiment 2 or the embodiment 4, the step that the controller adjusts the frequency of the compressor to make the pressure of the refrigerant discharged by the compressor equal to the target pressure specifically comprises: the controller acquires the current pressure of the refrigerant discharged by the compressor detected by the pressure sensor, and compares the current pressure with the target pressure; in the case that the current pressure is less than the target pressure, the controller controls the frequency of the compressor to increase, increases the compression efficiency, and increases the pressure of the refrigerant discharged by the compressor; in the case that the current pressure is greater than the target pressure, the controller controls the frequency of the compressor to decrease, decreases the compression efficiency, and decreases the pressure of the refrigerant discharged by the compressor; and in the case that the current pressure is equal to the target pressure, the controller controls the frequency of the compressor to maintain the current frequency, so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor environment temperature.

[0165] Embodiment 6

[0166] Further based on any one of the embodiment 3 to the embodiment 5, the step that the controller controls the expansion valve to adjust the opening degree to make the temperature of the refrigerant passing through the expansion valve equal to the target temperature specifically comprises: the controller acquires the current temperature of the refrigerant expanded by the expansion valve detected by the first temperature sensor, and compares the current temperature with the target temperature; in the case that the current temperature is greater than the target temperature, the controller controls the expansion valve to decrease the opening degree; in the case that the current temperature is less than the target temperature, the controller controls the expansion valve to increase the opening degree; and in the case that the current temperature is equal to the target temperature, the controller controls the expansion valve to maintain the current opening degree, so that the temperature of the refrigerant expanded by the expansion valve is different from the indoor environment temperature by a preset temperature difference.

[0167] Embodiment 7

[0168] Further based on the embodiment 6, the preset temperature difference is greater than 0℃ and less than or equal to 10℃.

[0169] In this embodiment, the preset temperature difference is greater than 0℃ and less than or equal to 10℃, so that the temperature of the refrigerant entering the evaporator is slightly lower than the indoor environment temperature, thereby improving the defrosting effect, and reducing the temperature difference of the refrigerant, which is helpful to reduce the power consumption of the compressor.

[0170] Specifically, the preset temperature difference can be 1℃, 2℃, 3℃, 4℃, 5℃, 6℃, 7℃, 8℃, 9℃ or 10℃, etc.

[0171] Embodiment 8

[0172] In any one of Embodiments 1 to 7, further, after the controller detects that the operation of the defrosting mode has met the first condition, the step of controlling the heat exchange system to exit the defrosting mode specifically comprises: when the controller controls the heat exchange system to start in the defrosting mode, timing, and when the operation time of the defrosting mode is greater than or equal to the preset time length, controlling the heat exchange system to exit the defrosting mode, so that the heat exchange system returns to the initial operating state.

[0173] Embodiment 9:

[0174] In any one of Embodiments 1 to 8, further, after the controller detects that the operation of the defrosting mode has met the first condition, the step of controlling the heat exchange system to exit the defrosting mode specifically comprises: when the controller controls the heat exchange system to start in the defrosting mode, obtaining the temperature of the inlet pipe of the evaporator, and when the temperature of the inlet pipe is greater than or equal to the preset temperature, controlling the heat exchange system to exit the defrosting mode, so that the heat exchange system returns to the initial operating state.

[0175] And, when the controller controls the heat exchange system to start in the defrosting mode, timing, and when the operation time of the defrosting mode is greater than or equal to the preset time length, controlling the heat exchange system to exit the defrosting mode, so that the heat exchange system returns to the initial operating state.

[0176] And, when the controller controls the heat exchange system to start in the defrosting mode, obtaining the temperature of the inlet pipe of the evaporator, and when the temperature of the inlet pipe is greater than or equal to the preset temperature, controlling the heat exchange system to exit the defrosting mode, so that the heat exchange system returns to the initial operating state. The two control modes can be executed simultaneously, and the defrosting mode can be exited when one of them is met.

[0177] Embodiment 10:

[0178] In Embodiment 9, further, the preset temperature is greater than 0℃ and less than or equal to 10℃.

[0179] In this embodiment, after the inlet pipe of the evaporator is frosted, its temperature is usually below zero, and then when the temperature reaches above 0℃, defrosting can be realized. If the preset temperature is too high, it will affect the heat exchange effect. Therefore, setting the range of 0℃ to 10℃ can ensure the defrosting effect while reducing the impact on the heat exchange effect.

[0180] Specifically, the preset temperature can be 1℃, 2℃, 3℃, 4℃, 5℃, 6℃, 7℃, 8℃, 9℃ or 10℃, etc.

[0181] Embodiment 11:

[0182] As Figure 7As shown, the application provides a control device 700 of a heat exchange system, comprising: a response module 702, configured to control the heat exchange system to enter a defrosting mode in response to a defrosting instruction when the heat exchange system is running; a first adjustment module 704, configured to control the compressor to adjust the operating frequency according to the indoor environment temperature detected by the second temperature sensor, so as to adjust the saturation temperature of the refrigerant discharged by the compressor, and make the saturation temperature of the refrigerant discharged by the compressor equal to the indoor environment temperature; a second adjustment module 706, configured to control the expansion valve to adjust the opening degree according to the indoor environment temperature, so as to change the temperature of the refrigerant passing through the expansion valve, and make the refrigerant passing through the expansion valve meet the defrosting demand; and a first exit module 708, configured to control the heat exchange system to exit the defrosting mode after detecting that the running of the defrosting mode has met a first condition.

[0183] Embodiment 12

[0184] Further based on the embodiment 11, the first adjustment module comprises: a first calculation module, configured to obtain the detection result of the indoor environment temperature by the second temperature sensor, and calculate the target pressure of the refrigerant when the saturation temperature of the refrigerant is equal to the indoor environment temperature; and a third adjustment module, configured to adjust the frequency of the compressor according to the target pressure, so as to make the pressure of the refrigerant discharged by the compressor equal to the target pressure.

[0185] Embodiment 13

[0186] Further based on the embodiment 11 or the embodiment 12, the second adjustment module comprises: a second calculation module, configured to calculate the difference between the indoor environment temperature and a preset temperature difference, and determine the difference as a target temperature, wherein the target temperature is lower than the indoor environment temperature; and a fifth adjustment module, configured to control the expansion valve to adjust the opening degree, so as to make the temperature of the refrigerant passing through the expansion valve equal to the target temperature.

[0187] Embodiment 14

[0188] Further based on any one of the embodiments 11 to 13, the third adjustment module comprises: a first acquisition module, configured to obtain the current pressure of the refrigerant discharged by the compressor detected by the pressure sensor, and then compare the current pressure with the target pressure; and a fifth adjustment module, configured to, in the case that the current pressure is less than the target pressure, control the frequency of the compressor to be increased, so as to increase the compression efficiency and increase the pressure of the refrigerant discharged by the compressor, in the case that the current pressure is greater than the target pressure, control the frequency of the compressor to be decreased, so as to decrease the compression efficiency and decrease the pressure of the refrigerant discharged by the compressor, and in the case that the current pressure is equal to the target pressure, control the frequency of the compressor to be maintained at the current frequency.

[0189] Embodiment 15

[0190] Further based on any one of Embodiment 11 to Embodiment 14, further, the fifth adjusting module comprises: a second obtaining module, configured to obtain a current temperature of the refrigerant expanded by the expansion valve detected by the first temperature sensor, and compare the current temperature with the target temperature; a sixth adjusting module, configured to, in a case that the current temperature is greater than the target temperature, control the controller to control the expansion valve to decrease the opening degree, in a case that the current temperature is less than the target temperature, control the controller to control the expansion valve to increase the opening degree, and in a case that the current temperature is equal to the target temperature, control the controller to control the expansion valve to maintain the current opening degree, so that the temperature of the refrigerant expanded by the expansion valve and the indoor environment temperature differ by a preset temperature difference.

[0191] Embodiment 16

[0192] Further based on Embodiment 15, further, the preset temperature difference is greater than 0℃ and less than or equal to 5℃.

[0193] Embodiment 17

[0194] Further based on any one of Embodiment 11 to Embodiment 16, further, the first exiting module comprises: a second exiting module, configured to, when the heat exchange system starts in the defrosting mode, time, and when the running time of the defrosting mode is greater than or equal to a preset time, control the heat exchange system to exit the defrosting mode, so that the heat exchange system returns to the initial running state.

[0195] Embodiment 18

[0196] Further based on any one of Embodiment 11 to Embodiment 17, further, the first exiting module comprises a third exiting module, and the third exiting module is configured to, when the controller controls the heat exchange system to start in the defrosting mode, obtain the temperature of the inlet pipe of the evaporator, and when the temperature of the inlet pipe is greater than or equal to a preset temperature, control the heat exchange system to exit the defrosting mode, so that the heat exchange system returns to the initial running state.

[0197] Embodiment 19

[0198] Further based on Embodiment 18, further, the preset temperature is greater than 0℃ and less than or equal to 10℃.

[0199] Embodiment 20

[0200] As Figure 1 and Figure 2As shown, the present application provides a heat exchange system 100, which comprises a compressor 110, an exhaust pipe 120, a condenser 130, a supercooling pipe 140, an expansion valve 150, an evaporator 160, a return pipe 170, a pressure sensor 180 and a first temperature sensor 190, wherein the pressure sensor 180 is arranged on the exhaust pipe 120, so that the pressure sensor 180 can detect the refrigerant pressure discharged by the compressor 110, the expansion valve 150 is arranged on the supercooling pipe 140, and the first temperature sensor 190 is arranged on the supercooling pipe 140 and located between the expansion valve 150 and the evaporator 160, so that the first temperature sensor 190 can detect the temperature of the refrigerant expanded by the expansion valve 150.

[0201] In addition, the compressor 110, the exhaust pipe 120, the condenser 130, the supercooling pipe 140, the expansion valve 150, the evaporator 160 and the return pipe 170 can form a heat exchange flow path, and the refrigerant can flow in the heat exchange flow path.

[0202] In addition, the heat exchange system 100 further comprises a second temperature sensor, which is electrically connected with the controller 200 and used for detecting the indoor environment temperature.

[0203] The controller 200 is used for executing the control method of the heat exchange system provided in any one of the above embodiments, so that the heat exchange system 100 has all the beneficial effects of the control method of the heat exchange system provided in any one of the above embodiments, which will not be repeated here.

[0204] Embodiment 21

[0205] On the basis of embodiment 20, further, the part of the supercooling pipe 140 and the part of the return pipe 170 are welded.

[0206] In this embodiment, the part of the supercooling pipe 140 and the part of the return pipe 170 are welded, so that they can exchange heat, improve the heat exchange efficiency, and in the defrosting mode, the refrigerant in the return pipe 170 can also exchange heat with the refrigerant in the supercooling pipe 140, thereby improving the defrosting effect and further reducing the power consumption.

[0207] Specifically, the length of the welded part of the supercooling pipe 140 and the return pipe 170 is between 2 meters and 3 meters, and can be about 2.5 meters.

[0208] Embodiment 22

[0209] The present application provides an electric appliance, which comprises the control device of the heat exchange system provided in any one of the above embodiments or the heat exchange system 100 provided in any one of the above embodiments.

[0210] The electric appliance provided by the present application has all the advantages of the control device of the heat exchange system provided by any of the above embodiments, and the heat exchange system 100 provided by any of the above embodiments, which will not be repeated here.

[0211] Specifically, the electric appliance is a refrigerator or an air conditioner.

[0212] Embodiment 23

[0213] The present application provides a computer device, comprising a memory for storing a computer program, and a processor for executing the computer program to realize the steps of the control method of the heat exchange system provided by any of the above embodiments.

[0214] The computer device provided by the present application comprises a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the steps of the control method of the heat exchange system provided by any of the above embodiments, thus having all the advantages of the control method of the heat exchange system provided by any of the above embodiments, which will not be repeated here.

[0215] Embodiment 24

[0216] The present application provides a readable storage medium, which stores a program or instructions, and the program or instructions are executed by a processor to realize the steps of the control method of the heat exchange system provided by any of the above embodiments.

[0217] The readable storage medium provided by the present application stores a program or instructions, and the program or instructions are executed by a processor to realize the steps of the control method of the heat exchange system provided by any of the above embodiments, thus having all the advantages of the control method of the heat exchange system provided by any of the above embodiments, which will not be repeated here.

[0218] In the present application, the terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integral connection; "connecting" can be direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0219] In the description of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the referred components or units must have a particular direction, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0220] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0221] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for a heat exchange system, characterized in that, include: In response to the defrost command, it enters defrost mode; In the defrosting mode, the compressor frequency is adjusted according to the indoor ambient temperature so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor ambient temperature. Adjust the opening of the expansion valve according to the indoor ambient temperature so that the refrigerant passing through the expansion valve meets the defrosting requirements. After the first condition is met, the defrosting mode is exited; The step of adjusting the opening of the expansion valve according to the indoor ambient temperature to ensure that the refrigerant passing through the expansion valve meets the defrosting requirements specifically includes: The target temperature is calculated based on the indoor ambient temperature and the preset temperature difference, and the target temperature is lower than the indoor ambient temperature. Adjust the opening of the expansion valve so that the temperature of the refrigerant passing through the expansion valve is equal to the target temperature; The step of exiting the defrost mode after the first condition is met specifically includes: After the defrosting mode has been running for a preset duration, the defrosting mode will exit.

2. The control method for the heat exchange system according to claim 1, characterized in that, The step of adjusting the compressor frequency according to the indoor ambient temperature so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor ambient temperature specifically includes: Obtain the indoor ambient temperature, calculate the target pressure of the refrigerant when the refrigerant's saturation temperature is the indoor ambient temperature; Adjust the frequency of the compressor so that the pressure of the refrigerant discharged by the compressor is equal to the target pressure.

3. The control method for the heat exchange system according to claim 2, characterized in that, The step of adjusting the frequency of the compressor so that the pressure of the refrigerant discharged by the compressor is equal to the target pressure specifically includes: Obtain the current pressure of the refrigerant discharged by the compressor; The frequency of the compressor is adjusted according to the relationship between the current pressure and the target pressure, so that the current pressure equals the target pressure.

4. The control method for the heat exchange system according to claim 1, characterized in that, The step of adjusting the opening of the expansion valve to make the temperature of the refrigerant passing through the expansion valve equal to the target temperature specifically includes: Obtain the current temperature of the refrigerant passing through the expansion valve; Based on the relationship between the current temperature and the target temperature, the opening of the expansion valve is adjusted so that the current temperature equals the target temperature.

5. The control method for the heat exchange system according to claim 1, characterized in that, The preset temperature difference is greater than 0℃ and less than or equal to 10℃.

6. The control method for the heat exchange system according to any one of claims 1 to 3, characterized in that, The step of exiting the defrost mode after the first condition is met specifically includes: Once the inlet pipe temperature of the evaporator reaches the preset temperature, the defrosting mode is exited.

7. The control method for the heat exchange system according to claim 6, characterized in that, The preset temperature is greater than 0℃ and less than or equal to 10℃.

8. A control device for a heat exchange system, characterized in that, include: The response module is used to respond to the defrost command and enter the defrost mode; The first adjustment module is used to adjust the frequency of the compressor according to the indoor ambient temperature in the defrosting mode, so that the saturation temperature of the refrigerant discharged by the compressor is equal to the indoor ambient temperature. The second adjustment module is used to adjust the opening of the expansion valve according to the indoor ambient temperature so that the refrigerant passing through the expansion valve meets the defrosting requirements. The first exit module is used to exit the defrost mode after the first condition is met; The second adjustment module includes: The second calculation module is used to calculate the target temperature based on the indoor ambient temperature and the preset temperature difference, wherein the target temperature is lower than the indoor ambient temperature; The fifth adjustment module is used to adjust the opening of the expansion valve so that the temperature of the refrigerant passing through the expansion valve is equal to the target temperature. The first exit module includes a second exit module, used to exit the defrost mode after the defrost mode has been running for a preset duration.

9. A heat exchange system, characterized in that, include: The compressor, exhaust pipe, condenser, subcooling pipe, expansion valve installed on the subcooling pipe, evaporator and return pipe are connected to form a heat exchange circuit; A pressure sensor, located in the exhaust pipe, is used to detect the pressure of the refrigerant output by the compressor; A first temperature sensor is located on the subcooling pipe and is used to detect the temperature of the refrigerant passing through the expansion valve; The controller is electrically connected to the compressor, the expansion valve, the pressure sensor, and the first temperature sensor, and is used to execute the control method of the heat exchange system as described in any one of claims 1 to 7.

10. The heat exchange system according to claim 9, characterized in that, The subcooling pipe and the return gas pipe are welded together.

11. An electrical appliance, characterized in that, include: The control device for the heat exchange system as described in claim 8; or The heat exchange system as described in claim 9 or 10.

12. The electrical equipment according to claim 11, characterized in that, The electrical appliances include refrigerators and air conditioners.

13. A computer device, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the steps of the control method for the heat exchange system as described in any one of claims 1 to 7.

14. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the control method for the heat exchange system as described in any one of claims 1 to 7.

Images