Heat pump system, chassis deicing method and device and medium

Abstract

The invention relates to a heat pump system, a chassis deicing method and device and a medium. The heat pump system comprises a compressor, an indoor heat exchanger, N + 1 outdoor heat exchangers and an economizer, the N outdoor heat exchangers are connected in parallel and then connected with the N + 1 outdoor heat exchanger through a second electronic expansion valve, and the N + 1 outdoor heat exchanger is connected with the indoor heat exchanger through a first electronic expansion valve. The economizer is located between the (N + 1) th outdoor heat exchanger and the compressor, and an auxiliary valve is arranged at the inlet position of the economizer. The method is applied to the heat pump system, and when the environment temperature is smaller than the first preset temperature and the heat pump system is switched from the defrosting mode to the heating mode, the suction temperature and the suction port pressure of the compressor are obtained, and the outlet temperature and the inlet temperature of the economizer are obtained; and the first electronic expansion valve is controlled to be opened to the maximum opening degree within the preset duration, the opening degree of the second electronic expansion valve is adjusted according to the air suction temperature and the air suction port pressure, and the opening degree of the auxiliary valve is adjusted according to the outlet temperature and the inlet temperature.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat pumps, and particularly relates to a heat pump system, a bottom disc deicing method, a device and a medium. BACKGROUND

[0002] Under the situation that energy supply is becoming tight and environmental protection requirements are continuously increasing, people are constantly seeking new energy which is both energy-saving and environmentally friendly, and the heat pump is one of the new energy. The heat pump system can realize the function of transporting low-temperature heat energy to high-temperature heat energy, and is widely used in actual engineering and production and life.

[0003] In the process of heat pump system operation in a low-temperature environment, frost formation often occurs in the outdoor heat exchanger, and once the frost formation meets the defrosting condition, the outdoor heat exchanger is usually switched to the defrosting mode for defrosting.

[0004] However, the defrosting water generated by the unit defrosting will drip to the bottom disc at the bottom of the outdoor heat exchanger for containing liquid, and if the defrosting water is accumulated on the bottom disc, the defrosting water in the bottom disc will freeze after the defrosting ends and the heating mode is switched, damaging the unit fan and other parts, and even damaging the whole machine. SUMMARY

[0005] In order to solve the above problems in the prior art, that is, to avoid the defrosting water in the bottom disc from freezing after switching from the defrosting mode to the heating mode, the application provides a heat pump system, a bottom disc deicing method, a device and a medium.

[0006] In a first aspect, the application provides a heat pump system, which comprises a compressor, an indoor heat exchanger, N+1 outdoor heat exchangers and an economizer, wherein,

[0007] The N+1 outdoor heat exchangers are arranged in a vertical direction, N outdoor heat exchangers are connected to the N+1 outdoor heat exchanger through a second electronic expansion valve in parallel, the N+1 outdoor heat exchanger is connected to the indoor heat exchanger through a first electronic expansion valve, and N is a positive integer;

[0008] The economizer is located between the N+1 outdoor heat exchanger and the compressor, and an auxiliary valve is arranged at the inlet position of the economizer.

[0009] In a possible implementation manner, a bottom disc for containing water is arranged below the N+1 outdoor heat exchanger, and part of the outlet pipeline of the N+1 outdoor heat exchanger is arranged in the bottom disc.

[0010] In a possible implementation manner, the heat pump system further comprises a four-way valve, and the compressor is connected to the indoor heat exchanger and the N+1 outdoor heat exchangers through the four-way valve;

[0011] The N+1 outdoor heat exchangers are arranged equidistantly in a vertical direction.

[0012] In a possible implementation, the heat pump system further comprises a drive board configured to drive the compressor to operate, and the drive board is located between the N+1 outdoor heat exchanger and the first electronic expansion valve.

[0013] In a second aspect, the application provides a method for deicing a chassis, applied to the heat pump system as described above, and the method comprises:

[0014] obtaining an ambient temperature and an operating mode of the heat pump system;

[0015] when the ambient temperature is less than a first preset temperature, and the heat pump system switches from a defrosting mode to a heating mode, obtaining a suction temperature and a suction port pressure of the compressor, and obtaining an outlet temperature and an inlet temperature of the economizer;

[0016] controlling the first electronic expansion valve to open to a maximum opening degree within a preset time length, adjusting an opening degree of the second electronic expansion valve according to the suction temperature and the suction port pressure, and adjusting an opening degree of the auxiliary valve according to the outlet temperature and the inlet temperature.

[0017] In a possible implementation, after the preset time length, the method further comprises:

[0018] obtaining a new suction temperature and a new suction port pressure, and obtaining a new outlet temperature and a new inlet temperature;

[0019] adjusting the opening degree of the first electronic expansion valve according to the new suction temperature and the new suction port pressure, controlling the second electronic expansion valve to open to the maximum opening degree, and adjusting the opening degree of the auxiliary valve according to the new outlet temperature and the new inlet temperature.

[0020] In a possible implementation, the method further comprises:

[0021] when the ambient temperature is less than the first preset temperature, and the heat pump system operates in the defrosting mode, obtaining a discharge temperature of the compressor and a target discharge temperature;

[0022] adjusting the opening degree of the first electronic expansion valve according to the discharge temperature and the target discharge temperature, controlling the second electronic expansion valve to open to the maximum opening degree, and controlling the auxiliary valve to be in a closed state.

[0023] In a possible implementation, the adjusting the opening degree of the first electronic expansion valve according to the discharge temperature and the target discharge temperature comprises:

[0024] obtaining an exhaust temperature difference value based on the exhaust temperature and the target exhaust temperature;

[0025] controlling the first electronic expansion valve to increase by a first step number when the exhaust temperature difference value is greater than or equal to the first preset difference value, wherein the first step number is determined according to the exhaust temperature difference value;

[0026] controlling the first electronic expansion valve to decrease by the first step number when the exhaust temperature difference value is less than or equal to the second preset difference value;

[0027] controlling the first electronic expansion valve to maintain a current opening degree when the exhaust temperature difference value is greater than the second preset difference value and less than the first preset difference value.

[0028] In a possible implementation, the method further includes:

[0029] obtaining an inlet temperature and an inlet pressure of the compressor, an outlet temperature and an inlet temperature of the economizer when the ambient temperature is less than the first preset temperature and the heat pump system operates in the heating mode;

[0030] adjusting an opening degree of the first electronic expansion valve according to the inlet temperature and the inlet pressure, controlling the second electronic expansion valve to open to a maximum opening degree, and adjusting an opening degree of the auxiliary valve according to the outlet temperature and the inlet temperature to improve a heating capacity of the heat pump system.

[0031] In a possible implementation, the method further includes:

[0032] obtaining an inlet temperature and an inlet pressure of the compressor when the ambient temperature is greater than or equal to the first preset temperature and the heat pump system operates in the heating mode;

[0033] adjusting an opening degree of the first electronic expansion valve according to the inlet temperature and the inlet pressure, controlling the second electronic expansion valve to open to a maximum opening degree, and controlling the auxiliary valve to be in a closed state.

[0034] In a possible implementation, the method further includes:

[0035] obtaining an inlet temperature and an inlet pressure of the compressor when the ambient temperature is less than or equal to a second preset temperature and the heat pump system operates in a cooling mode, wherein the second preset temperature is greater than the first preset temperature;

[0036] adjusting an opening degree of the first electronic expansion valve according to the inlet temperature and the inlet pressure, controlling the second electronic expansion valve to open to a maximum opening degree, and controlling the auxiliary valve to be in a closed state.

[0037] In a possible implementation, the method further includes:

[0038] When the ambient temperature is greater than the second preset temperature and the heat pump system operates in the cooling mode, the suction temperature and the suction port pressure of the compressor are obtained, and the outlet temperature and the inlet temperature of the economizer are obtained;

[0039] According to the suction temperature and the suction port pressure, the opening degree of the first electronic expansion valve is adjusted, and the second electronic expansion valve is controlled to open to the maximum opening degree; and according to the outlet temperature and the inlet temperature, the opening degree of the auxiliary valve is adjusted.

[0040] In a possible implementation, the adjusting the opening degree of the first electronic expansion valve / second electronic expansion valve according to the suction temperature and the suction port pressure includes:

[0041] The suction port pressure is converted into a refrigerant saturation temperature, and a current suction superheat degree is calculated according to the suction temperature and the refrigerant saturation temperature;

[0042] A target suction superheat degree of the compressor is obtained, and a suction superheat degree difference value is determined according to the current suction superheat degree and the target suction superheat degree;

[0043] The opening degree of the first electronic expansion valve / second electronic expansion valve is adjusted according to the suction superheat degree difference value.

[0044] In a possible implementation, the adjusting the opening degree of the first electronic expansion valve / second electronic expansion valve according to the suction superheat degree difference value includes:

[0045] When the suction superheat degree difference value is greater than or equal to a first preset difference value, the first electronic expansion valve / second electronic expansion valve is controlled to increase by a second step number, where the second step number is determined according to the suction superheat degree difference value;

[0046] When the suction superheat degree difference value is less than or equal to a second preset difference value, the first electronic expansion valve / second electronic expansion valve is controlled to decrease by the second step number, where the second preset difference value is less than the first preset difference value;

[0047] When the suction superheat degree difference value is greater than the second preset difference value and less than the first preset difference value, the first electronic expansion valve / second electronic expansion valve is controlled to maintain the current opening degree.

[0048] In a possible implementation, the adjusting the opening degree of the auxiliary valve according to the outlet temperature / inlet temperature and the new outlet temperature / new inlet temperature includes:

[0049] determine a current charge gas superheat based on the outlet temperature / new outlet temperature and the inlet temperature / new inlet temperature;

[0050] obtain a target charge gas superheat of the economizer, and determine a charge gas superheat difference based on the current charge gas superheat and the target charge gas superheat;

[0051] when the charge gas superheat difference is greater than or equal to the first preset difference, control the auxiliary valve to increase by a third step number, wherein the third step number is determined according to the charge gas superheat difference;

[0052] when the charge gas superheat difference is less than or equal to the second preset difference, control the auxiliary valve to close by a third step number;

[0053] when the charge gas superheat difference is greater than the second preset difference and less than the first preset difference, control the auxiliary valve to maintain a current opening degree.

[0054] In a third aspect, the present application provides a chassis deicing device, applied to the heat pump system as described above, and the device comprises:

[0055] an obtaining module, configured to obtain an ambient temperature and an operating mode of the heat pump system;

[0056] a first processing module, configured to, when the ambient temperature is less than a first preset temperature and the heat pump system switches from a defrosting mode to a heating mode, obtain a suction temperature and a suction port pressure of the compressor, and obtain an outlet temperature and an inlet temperature of the economizer;

[0057] a second processing module, configured to, within a preset time length, control the first electronic expansion valve to open to a maximum opening degree, adjust an opening degree of the second electronic expansion valve according to the suction temperature and the suction port pressure, and adjust an opening degree of the auxiliary valve according to the outlet temperature and the inlet temperature.

[0058] In a fourth aspect, the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the chassis deicing method as described above.

[0059] The heat pump system provided in the application comprises a compressor, an indoor heat exchanger, N+1 outdoor heat exchangers and an economizer, wherein the N+1 outdoor heat exchangers are arranged at intervals along the vertical direction, N outdoor heat exchangers are connected to the N+1 outdoor heat exchanger through a second electronic expansion valve after being connected in parallel, the N+1 outdoor heat exchanger is connected to the indoor heat exchanger through a first electronic expansion valve, and N is a positive integer; the economizer is located between the N+1 outdoor heat exchanger and the compressor, and an auxiliary valve is arranged at the inlet position of the economizer; the chassis deicing method, device and medium provided in the application acquire an ambient temperature and an operating mode of the heat pump system; when the ambient temperature is less than a first preset temperature and the heat pump system is switched from a defrosting mode to a heating mode, the suction temperature and suction port pressure of the compressor are acquired, the outlet temperature and inlet temperature of the economizer are acquired; the first electronic expansion valve is controlled to be opened to the maximum opening degree within a preset time length, the opening degree of the second electronic expansion valve is adjusted according to the suction temperature and the suction port pressure, and the opening degree of the auxiliary valve is adjusted according to the outlet temperature and the inlet temperature.

[0060] The heat pump system provided in the application comprises a compressor, an indoor heat exchanger, N+1 outdoor heat exchangers and an economizer, wherein the N+1 outdoor heat exchangers are arranged at intervals along the vertical direction, N outdoor heat exchangers are connected to the N+1 outdoor heat exchanger through a second electronic expansion valve after being connected in parallel, the N+1 outdoor heat exchanger is connected to the indoor heat exchanger through a first electronic expansion valve, and N is a positive integer; the economizer is located between the N+1 outdoor heat exchanger and the compressor, and an auxiliary valve is arranged at the inlet position of the economizer; the chassis deicing method, device and medium provided in the application acquire an ambient temperature and an operating mode of the heat pump system; when the ambient temperature is less than a first preset temperature and the heat pump system is switched from a defrosting mode to a heating mode, the suction temperature and suction port pressure of the compressor are acquired, the outlet temperature and inlet temperature of the economizer are acquired; the first electronic expansion valve is controlled to be opened to the maximum opening degree within a preset time length, the opening degree of the second electronic expansion valve is adjusted according to the suction temperature and the suction port pressure, and the opening degree of the auxiliary valve is adjusted according to the outlet temperature and the inlet temperature. BRIEF DESCRIPTION OF DRAWINGS

[0061] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and serve to explain the principles of the application.

[0062] Figure 1 A structural schematic diagram of a heat pump system provided for an embodiment of the application;

[0063] Figure 2 A flow of a chassis deicing method provided for an embodiment of the application Figure One ;

[0064] Figure 3 A sensor arrangement schematic diagram of a heat pump system provided for an embodiment of the application;

[0065] Figure 4 A flow of a chassis deicing method provided for an embodiment of the application Figure Two ;

[0066] Figure 5A flow of a chassis deicing method provided for an embodiment of the present application Figure Three ;

[0067] Figure 6 A flow of a chassis deicing method provided for an embodiment of the present application Figure Four ;

[0068] Figure 7 A structural schematic diagram of a chassis deicing device provided for an embodiment of the present application.

[0069] The specific embodiments of the present application have been shown through the above drawings, and will be described in more detail hereinafter. These drawings and the written description are not intended to restrict the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0071] The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0072] In the embodiments of the present application, the words "exemplary" or "for example" are used to mean example, illustration, or description. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design solutions. Rather, the use of "exemplary" or "for example" is intended to present relevant concepts in a concrete manner.

[0073] With the development of heat pump technology and the improvement of people's quality of life, people use heat pump systems more and more frequently. Not only can heat pump systems be used for heating, but also can heat water using the heat generated by heat pump systems. During the heating operation of the heat pump system, the outdoor heat exchanger will usually frost due to the low temperature environment. When the frost is serious, the system usually controls the four-way valve to reverse, so as to switch to the defrosting mode, and defrost the outdoor heat exchanger by using high-temperature refrigerant.

[0074] However, during the defrosting process, the frost layer on the outdoor heat exchanger melts into water and flows along the fins to the bottom plate below the outdoor heat exchanger. If the water accumulates on the bottom plate, after the defrosting is completed and the four-way valve continues to run in the heating mode, the bottom plate will freeze, affecting the heat exchange effect of the outdoor heat exchanger, and even causing damage to the outdoor heat exchanger.

[0075] The existing technical solution mainly arranges an electric heating belt in the bottom plate to melt the remaining ice on the bottom plate, but due to the limitation of heating power, the effect of the heating belt is limited, and the ice problem on the bottom plate cannot be effectively solved in extremely cold areas. In addition, the electric heating belt has safety hazards, and is soaked in water for a long time, which has problems such as aging.

[0076] Therefore, the present application provides a heat pump system and a method for defrosting the bottom plate of the heat pump system. Based on the existing technology, the traditional single outdoor heat exchanger is changed into N+1 outdoor heat exchangers. Among them, N outdoor heat exchangers are connected to the N+1 outdoor heat exchanger through the second electronic expansion valve in parallel, the N+1 outdoor heat exchanger is connected to the indoor heat exchanger through the first electronic expansion valve, and the N+1 outdoor heat exchanger is located between the first electronic expansion valve and the second electronic expansion valve. In this way, one of the two electronic expansion valves is selected as a throttle valve, and the other is selected as a full-open valve, so that the switching of the N+1 outdoor heat exchanger between cold and hot states can be realized, and then after the defrosting of the heat pump system is completed and switched to the heating mode, the defrosting water in the bottom plate is heated by the high-temperature state of the N+1 outdoor heat exchanger to avoid freezing of the defrosting water due to low temperature environment.

[0077] The heat pump system provided by the embodiment of the present application will be described below. Figure 1 The heat pump system provided by the embodiment of the present application will be described below.

[0078] Figure 1 A structural schematic diagram of a heat pump system provided by the embodiment of the present application is shown in the figure. Figure 1 As shown in the figure, the heat pump system 10 includes a compressor 101, an indoor heat exchanger 102, N+1 outdoor heat exchangers 103, and an economizer 104. Among them, the N+1 outdoor heat exchangers are arranged in a vertical direction, N outdoor heat exchangers 103 are connected to the N+1 outdoor heat exchanger 103 through the second electronic expansion valve 106 in parallel, the N+1 outdoor heat exchanger 103 is connected to the indoor heat exchanger 102 through the first electronic expansion valve 105, N is a positive integer, the economizer 104 is located between the N+1 outdoor heat exchanger 103 and the compressor 101, and the auxiliary valve 107 is arranged at the inlet position of the economizer 104.

[0079] It is known in the art that the outdoor heat exchanger 103 is usually a finned tube heat exchanger with a large internal volume. The heat exchanger uses U-shaped copper tubes inserted in aluminum fins. A copper tube distributor divides the outdoor heat exchanger into multiple parallel paths to reduce resistance and maximize the working efficiency of the outdoor heat exchanger. In this embodiment, the parallel connection of the N outdoor heat exchangers 103 can be achieved in this way.

[0080] To better illustrate the position structure of the outdoor heat exchanger 103, in this embodiment, five outdoor heat exchangers 103 are taken as an example. As shown in Figure 1 , the five outdoor heat exchangers 103 are arranged from top to bottom, respectively 1031, 1032, 1033, 1034 and 1035.

[0081] Optionally, a bottom tray 108 for containing water is arranged below the N+1 outdoor heat exchanger 1035. Part of the outlet pipe of the N+1 outdoor heat exchanger 1035 is arranged in the bottom tray 108, so that the defrosting water generated by the N+1 outdoor heat exchanger 1035 can drip into the bottom tray 108, avoiding pollution of other devices and the ground. In the specific implementation process, as shown in Figure 1 , in order to avoid the outlet pipe of the N+1 outdoor heat exchanger 1035 winding in the bottom tray 108, the part of the outlet pipe U-shaped arranged in the bottom tray 108.

[0082] Optionally, the heat pump system 10 further comprises a four-way valve 109. The compressor 101 is connected to the indoor heat exchanger 102 and the N+1 outdoor heat exchangers 103 through the four-way valve 109. The N+1 outdoor heat exchangers 103 are arranged at equal intervals along the vertical direction.

[0083] Optionally, the heat pump system 10 further comprises a drive board 110. The drive board 110 is used to drive the compressor 101 to operate. The drive board 110 is located between the N+1 outdoor heat exchanger 1035 and the first electronic expansion valve 105.

[0084] The working principle of the heat pump system provided by the embodiment of the present application is as follows:

[0085] 1. When the heat pump system 10 operates in heating mode, the compressor 101 compresses the refrigerant into high-temperature and high-pressure saturated gas. The gaseous refrigerant flows into the indoor heat exchanger 102 for condensation. Then, after throttling through the first electronic expansion valve 105, it first reaches the N+1 outdoor heat exchanger 1035 for evaporation. Then, after flowing through the fully open second electronic expansion valve 106, it enters the N parallel-connected outdoor heat exchangers (1031, 1032, 1033 and 1034) for further evaporation. Finally, it returns to the compressor 101, and the cycle continues. In this process, the second electronic expansion valve 106 is fully open, and the first electronic expansion valve 105 acts as a throttle valve, so that the heat exchange area is increased based on the traditional single outdoor heat exchanger, improving the heat exchange efficiency.

[0086] 2. In addition, when the ambient temperature is too low and the heating capacity needs to be increased, the auxiliary valve 107 can be opened to allow the part of the refrigerant throttled by the first electronic expansion valve 105 to flow into the economizer 104 for heat exchange, thereby increasing the discharge capacity of the compressor 101.

[0087] 3. After the heat pump system 10 runs in the heating mode for a long time, water vapor in the outdoor environment will adhere to the surface of the N+1 outdoor heat exchangers 103, and then condense into frost or ice layer. Thus, a certain thickness of ice and frost layer will be formed on the outer surface of the outdoor heat exchanger 103, which will block the heat exchange between the refrigerant in the outdoor heat exchanger 103 and the outdoor environment, limit the heat exchange efficiency of the outdoor heat exchanger 103, and further affect the heating performance of the heat pump system 10. At this time, the outdoor heat exchanger 103 can be operated by running the defrosting mode to heat the ice and frost layer on the outer surface of the outdoor heat exchanger 103 to melt, so as to achieve the purpose of defrosting.

[0088] The refrigerant flow direction in the refrigerant circulation loop when the heat pump system 10 runs in the defrosting mode is the same as that when the heat pump system runs in the cooling mode, that is, the high-temperature refrigerant discharged from the compressor 101 first flows to the N outdoor heat exchangers (1031, 1032, 1033, and 1034) for temperature rise and defrosting, then enters the N+1 outdoor heat exchanger 1035 through the fully opened second electronic expansion valve 106 for temperature rise and defrosting again, and then flows into the indoor heat exchanger 102 for heat exchange after being throttled by the first electronic expansion valve 105, and finally returns to the compressor 101 for compression operation.

[0089] In this process, the high-temperature refrigerant first flows into the N+1 outdoor heat exchangers 103, and transfers its heat to the outdoor heat exchangers 103. Thus, the ice and frost layer on the outer surface of the outdoor heat exchanger 103 absorbs heat and melts into defrosting water in liquid state, which can drip from the outdoor heat exchanger 103 to the bottom plate 108 below the N+1 outdoor heat exchanger 1035 under the action of gravity, and then be discharged to the outdoor environment through the discharge pipeline. In this process, the first electronic expansion valve 105 still functions as a throttling valve to ensure that the frost layer on all outdoor heat exchangers 103 is removed.

[0090] 4. Under the influence of the outdoor environment, the temperature of the bottom plate 108 is also low, so the defrosting water may condense into ice on the bottom plate 108, or water vapor in the outdoor environment may also adhere to the surface of the bottom plate 108 and condense into ice and frost layer. Therefore, in order to eliminate the ice and frost layer condensed on the bottom plate 108, the second electronic expansion valve 106 can be controlled as a throttling valve to control the first electronic expansion valve 105 to be fully opened within a certain period of time after the defrosting is completed and the heating mode is switched.

[0091] At this time, the compressor 101 also compresses the refrigerant into a high-temperature and high-pressure saturated gas, the gaseous refrigerant flows into the indoor heat exchanger 102 to be condensed, and then reaches the N+1 outdoor heat exchanger 1035 through the fully opened first electronic expansion valve 105. At this time, the N+1 outdoor heat exchanger 1035 is still in a high-temperature state, and the heat exchanger pipes in the bottom plate 108 can heat the frost layer. Then, the refrigerant is throttled through the second electronic expansion valve 106 and enters the N parallel-connected outdoor heat exchangers (1031, 1032, 1033, and 1034) to evaporate, and finally returns to the compressor 101, so as to circulate repeatedly. In this process, the second electronic expansion valve 106 acts as a throttle valve, so that the N+1 outdoor heat exchanger 1035 and the heat exchanger pipes in the bottom plate 108 are in a high-pressure and hot state, and the bottom plate 108 is defrosted.

[0092] After a period of time, the heat pump system 10 can return to the normal heating mode, that is, the first electronic expansion valve 105 acts as a throttle valve, and the second electronic expansion valve 106 is fully opened.

[0093] 5、As mentioned above, the refrigerant circulation loop of the heat pump system 10 in the cooling mode is basically the same as that in the defrosting mode, so this embodiment will not be described again. It is worth noting that in the cooling mode, the first electronic expansion valve 105 must act as a throttle valve, and the second electronic expansion valve 106 must be fully opened; otherwise, if the second electronic expansion valve 106 throttles and the first electronic expansion valve 105 is fully opened, the refrigerant throttled through the second electronic expansion valve 106 will first exchange heat with the N+1 outdoor heat exchanger 1035 and the outdoor high ambient temperature, greatly reducing the cooling capacity of the heat pump system 10. After the second electronic expansion valve 106 is fully opened, all the outdoor heat exchangers 103 are in a high-temperature and high-pressure state, and the heat exchange efficiency is the highest.

[0094] Secondly, since the driving board 110 is located between the N+1 outdoor heat exchanger 1035 and the first electronic expansion valve 105, the refrigerant after heat exchange through the outdoor heat exchanger 103 can reduce the temperature of the driving board 110, so as to ensure the normal work of the driving board 110. Compared with the air cooling method of the prior art, the refrigerant cooling scheme provided in the embodiment has better cooling effect. The use of the refrigerant state before throttling to cool the driving board 110 can avoid the condensation caused by the too low temperature of the driving board 110, which leads to the failure of the driving board.

[0095] 6、In addition, if the outdoor ambient temperature is too high, the refrigeration enthalpy can be increased by opening the auxiliary valve 107. Specifically, the second electronic expansion valve 106 is fully opened, and the pressure before the auxiliary valve 107 is high. By controlling the opening degree of the auxiliary valve 107, the pressure after the auxiliary valve 107 can be controlled between high pressure and low pressure, and the pressure after the auxiliary valve 107 is higher than the pressure at the low pressure position of the compressor 101, so that the air supplement can be realized. Otherwise, if the second electronic expansion valve 106 is throttled and the first electronic expansion valve 105 is fully opened, the pressure before the auxiliary valve 107 is also low, and the pressure difference between the suction port of the compressor 101 and the pressure before the auxiliary valve 107 cannot be formed, so that the air supplement cannot be realized.

[0096] Through the cooperation of the above-mentioned devices, through the state switching of the two electronic expansion valves, not only the heat exchange area can be increased, but also the defrosting water in the chassis after defrosting can be prevented from freezing.

[0097] The technical solutions of the present application and how the technical solutions of the present application solve the above-mentioned technical problems will be described in detail below with specific examples. The following specific examples can be implemented independently or in combination. For the same or similar concepts or processes, some examples may not be described again.

[0098] Figure 2 A chassis deicing method provided by the embodiment of the present application Figure One As shown in Figure 2 , the method is applied to the heat pump system provided by the above-mentioned embodiment, and the method comprises the following steps.

[0099] S201, acquiring the ambient temperature and the operating mode of the heat pump system.

[0100] In the above-mentioned solution, the ambient temperature usually determines the operating mode of the heat pump system at the moment. When the ambient temperature is low, the heat pump system usually operates in the heating mode. When the ambient temperature is high, the heat pump system usually operates in the cooling mode. When the heat pump system meets other conditions, it also operates in the defrosting mode.

[0101] S202, when the ambient temperature is less than the first preset temperature and the heat pump system switches from the defrosting mode to the heating mode, acquiring the suction temperature and the suction port pressure of the compressor, and acquiring the outlet temperature and the inlet temperature of the economizer.

[0102] In this step, in a low-temperature environment, the heat pump system usually operates in the heating mode. If the heat pump system has just finished operating in the defrosting mode at the moment, the defrosting water generated in the defrosting process will be collected in the chassis and then discharged from the system. In the specific implementation process, the first preset temperature can be 0℃ or 5℃.

[0103] When the heat pump system switches to heating mode, the outdoor heat exchanger functions as an evaporator in the refrigerant circulation. All outdoor heat exchangers are in a low-temperature, low-pressure zone. If the defrost water in the chassis is not drained in time, it will freeze due to the low chassis temperature. At this point, the operating parameters of the compressor and economizer can be used to control the opening and closing of the two electronic expansion valves, keeping the (N+1) outdoor heat exchanger at a high temperature to melt the ice in the chassis.

[0104] In a specific implementation process, the above operating parameters of the compressor and the economizer can be obtained through sensors, for example, Figure 3 As shown, a temperature sensor Ts and a pressure sensor P are provided at the suction port of the compressor 301 for obtaining the suction temperature and the suction port pressure, respectively; a temperature sensor Ti and a temperature sensor To are provided at the inlet and outlet of the economizer 304 for detecting the inlet temperature and the outlet temperature, respectively.

[0105] S203, controlling the first electronic expansion valve to open to the maximum opening within a preset time, and adjusting the opening of the second electronic expansion valve according to the intake temperature and the intake port pressure, and adjusting the opening of the auxiliary valve according to the outlet temperature and the inlet temperature.

[0106] In the above solution, for a period of time after defrosting, the first electronic expansion valve is fully opened, and the second electronic expansion valve is used as a throttling valve. This maintains the (N+1)th outdoor heat exchanger at a high temperature, pre-throttling. This high temperature heats the defrost water and ice in the chassis, increasing the subcooling of the refrigerant before the second electronic expansion valve. The preset duration can be 10 minutes or 15 minutes.

[0107] Secondly, since the outdoor ambient temperature is low, heat exchange can be performed through the economizer to improve the heating capacity of the system. Specifically, the opening of the auxiliary valve can be adjusted according to the inlet and outlet temperatures of the economizer.

[0108] In an embodiment of the present application, within a period of time after defrosting is completed, the first electronic expansion valve is controlled to be fully open, and the second electronic expansion valve is used as a throttle valve, so that the outdoor heat exchanger located above the chassis is in a high-temperature state before throttling, and then the high temperature is used to heat the defrost water in the chassis to prevent the defrost water from freezing in a low-temperature environment.

[0109] The following combination Figure 4 The specific embodiments illustrate the implementation process of controlling the opening and closing of two electronic expansion valves and an auxiliary valve according to the ambient temperature and the operating mode of the heat pump system in the chassis deicing method of the present application.

[0110] Figure 4 A process of a chassis deicing method provided in an embodiment of the present application Figure Two .like Figure 4 As shown, the method includes:

[0111] S401, acquire an ambient temperature and an operation mode of the heat pump system.

[0112] Synchronization step S201.

[0113] S402, when the ambient temperature is greater than or equal to a first preset temperature and the heat pump system operates in a heating mode, acquire a suction temperature of the compressor and a suction port pressure;

[0114] S403, according to the suction temperature and the suction port pressure, adjust an opening degree of the first electronic expansion valve, control the second electronic expansion valve to open to a maximum opening degree, and control the auxiliary valve to be in a closed state.

[0115] In the above scheme, if the ambient temperature exceeds the preset threshold and the system operates in the heating mode, it indicates that the current ambient temperature is not too low, and there is no need to improve the system heating capacity by the economizer, at this time the auxiliary valve is closed; secondly, the first electronic expansion valve as a throttling valve and the second electronic expansion valve fully open can make the N+1 outdoor heat exchangers all be in a low-pressure evaporation heat absorption state, increase the heat exchange area, and the opening degree of the first electronic expansion valve can be controlled according to the operating parameters of the suction port of the compressor.

[0116] S404, when the ambient temperature is less than the first preset temperature and the heat pump system operates in the heating mode, acquire the suction temperature of the compressor and the suction port pressure, acquire an outlet temperature and an inlet temperature of the economizer;

[0117] S405, according to the suction temperature and the suction port pressure, adjust the opening degree of the first electronic expansion valve, control the second electronic expansion valve to open to the maximum opening degree, and according to the outlet temperature and the inlet temperature, adjust the opening degree of the auxiliary valve to improve the heating capacity of the heat pump system.

[0118] In this step, if the ambient temperature is lower than the preset threshold and the system operates in the heating mode, it indicates that the current ambient temperature is too low, in order to improve the system heating capacity, the auxiliary valve can be opened on the basis of the conventional heating scheme of the system, so that part of the refrigerant flows back to the compressor through the economizer, and the compressor discharge volume is increased.

[0119] S406, when the ambient temperature is less than the first preset temperature and the heat pump system operates in a defrosting mode, acquire a discharge temperature of the compressor and a target discharge temperature;

[0120] S407, according to the discharge temperature and the target discharge temperature, adjust the opening degree of the first electronic expansion valve, control the second electronic expansion valve to open to the maximum opening degree, and control the auxiliary valve to be in the closed state.

[0121] In the above solution, if the ambient temperature falls below the preset threshold and the system is in the defrost process, the second electronic expansion valve is fully opened, and the first electronic expansion valve acts as a throttling valve. This maintains high temperature and high pressure in all outdoor heat exchangers, ensuring that all N+1 outdoor heat exchangers are defrosted. During this process, the economizer is not required, so the auxiliary valve is closed.

[0122] In order to prevent the compressor exhaust temperature from being too low during the defrost process, resulting in liquid backflow and damage to the compressor, the opening of the first electronic expansion valve can be controlled according to the exhaust temperature of the compressor. Specifically, the exhaust temperature difference is obtained based on the exhaust temperature and the target exhaust temperature; when the exhaust temperature difference is greater than or equal to the first preset difference, the first electronic expansion valve is controlled to increase the first step, wherein the first step is determined according to the exhaust temperature difference; when the exhaust temperature difference is less than or equal to the second preset difference, the first electronic expansion valve is controlled to close the first step; when the exhaust temperature difference is greater than the second preset difference and less than the first preset difference, the first electronic expansion valve is controlled to maintain the current opening.

[0123] In a specific implementation process, the above operating parameters of the compressor can be obtained by sensors, for example, Figure 3 As shown, a temperature sensor Td is provided at the exhaust port of the compressor 301 for obtaining the exhaust temperature; secondly, the first preset difference can be 2 or 5; the second preset difference can be -2 or -5; the first step number can be 2-5 times the exhaust temperature difference.

[0124] S408. When the ambient temperature is lower than the first preset temperature and the heat pump system switches from the defrosting mode to the heating mode, obtaining the suction temperature and suction port pressure of the compressor, and obtaining the outlet temperature and inlet temperature of the economizer;

[0125] S409: Control the first electronic expansion valve to open to the maximum opening within a preset time, and adjust the opening of the second electronic expansion valve according to the intake temperature and the intake port pressure, and adjust the opening of the auxiliary valve according to the outlet temperature and the inlet temperature.

[0126] Same as above steps S202-S203.

[0127] S410, after a preset time, obtaining a new intake temperature and a new intake port pressure, and obtaining a new outlet temperature and a new inlet temperature;

[0128] S411. According to the new intake temperature and the new intake port pressure, adjust the opening of the first electronic expansion valve, control the second electronic expansion valve to open to the maximum opening, and adjust the opening of the auxiliary valve according to the new outlet temperature and the new inlet temperature.

[0129] In this step, after a period of time, the system returns to the normal heating mode to heat, and since the ambient temperature is lower than the preset threshold, the opening degree of the first electronic expansion valve and the auxiliary valve needs to be adjusted according to the operating parameters of the compressor and the economizer respectively, and the second electronic expansion valve is fully opened to make the outdoor heat exchanger be in the low-pressure zone entirely, thereby increasing the heat absorption of the outdoor heat exchanger.

[0130] S412, when the ambient temperature is less than or equal to the second preset temperature and the heat pump system operates in the cooling mode, the suction temperature and the suction port pressure of the compressor are obtained, wherein the second preset temperature is greater than the first preset temperature.

[0131] S413, according to the suction temperature and the suction port pressure, the opening degree of the first electronic expansion valve is adjusted, the second electronic expansion valve is controlled to be opened to the maximum opening degree, and the auxiliary valve is controlled to be in the closed state.

[0132] In the above scheme, if the ambient temperature is lower than the second preset threshold and the system operates in the cooling mode, it indicates that the current ambient temperature is not too high, and at this time, the auxiliary valve does not need to be opened to increase the cooling capacity of the system, and the auxiliary valve is closed; secondly, the first electronic expansion valve is used as a throttling valve, and the second electronic expansion valve is fully opened, so that the N+1 outdoor heat exchangers are all in the high-pressure condensing state, the heat exchange area of the condenser is increased, and the opening degree of the first electronic expansion valve can be controlled according to the operating parameters of the suction port of the compressor. In the specific implementation process, the second preset temperature can be 30℃ or 35℃.

[0133] It is worth noting that when the system operates in the cooling mode, since the driving board is located between the first electronic expansion valve and the N+1 outdoor heat exchanger, the refrigerant flowing through the driving board before throttling can cool the driving board, thereby ensuring the normal operation of the driving board.

[0134] S414, when the ambient temperature is greater than the second preset temperature and the heat pump system operates in the cooling mode, the suction temperature and the suction port pressure of the compressor are obtained, and the outlet temperature and the inlet temperature of the economizer are obtained.

[0135] S415, according to the suction temperature and the suction port pressure, the opening degree of the first electronic expansion valve is adjusted, the second electronic expansion valve is controlled to be opened to the maximum opening degree, and according to the outlet temperature and the inlet temperature, the opening degree of the auxiliary valve is adjusted.

[0136] In this step, if the ambient temperature is higher than the second preset threshold and the system operates in the cooling mode, it indicates that the current ambient temperature is too high, and at this time, the auxiliary valve can be opened on the basis of the normal cooling scheme of the system to realize the cooling enthalpy increase, and the opening degree of the auxiliary valve can be controlled according to the operating parameters of the economizer.

[0137] In an embodiment of the present application, an electronic expansion valve is added to the existing heat pump system, so that the two electronic expansion valves in the system can switch the operating state according to the ambient temperature and the operating mode of the heat pump system, that is, one of them is fully open and the other acts as a throttle valve, thereby realizing the switching control of the hot and cold states of the N+1th outdoor heat exchanger.

[0138] The following combination Figure 5 The specific embodiments illustrate the implementation process of adjusting the opening of the first electronic expansion valve / the second electronic expansion valve according to the intake temperature and the intake port pressure in the chassis deicing method of the present application.

[0139] Figure 5 The process of a chassis deicing method provided in the embodiment of the present application Figure Three .like Figure 5 As shown, the method includes:

[0140] S501. Convert the suction port pressure to the refrigerant saturation temperature, and calculate the current suction superheat based on the suction temperature and the refrigerant saturation temperature.

[0141] In the above scheme, the refrigerant used in the heat pump system is fixed, so the detected compressor suction port pressure can be converted into the refrigerant saturation temperature, and then the difference between the suction temperature and the refrigerant saturation temperature is calculated to obtain the compressor suction superheat.

[0142] S502: Obtain a target suction superheat of the compressor, and determine a suction superheat difference based on the current suction superheat and the target suction superheat.

[0143] In this step, after the intake air superheat is calculated, the difference between the intake air superheat and the target intake air superheat can be further calculated, and the opening of the throttle valve can be controlled based on this difference.

[0144] S503: When the intake superheat difference is greater than or equal to a first preset difference, control the first electronic expansion valve / the second electronic expansion valve to increase a second step number, wherein the second step number is determined according to the intake superheat difference.

[0145] In the above scheme, if the intake superheat difference exceeds the first preset difference, the number of steps for controlling the throttle valve is increased based on the current number of steps. The increased number of steps can be obtained according to the intake superheat difference. For example, consistent with the previous embodiment, the second number of steps can be 2-5 times the intake superheat difference.

[0146] S504: When the intake superheat difference is greater than the second preset difference and less than the first preset difference, control the first electronic expansion valve / the second electronic expansion valve to maintain the current opening, wherein the second preset difference is less than the first preset difference.

[0147] In this step, if the intake air superheat difference is between the second preset difference and the first preset difference, the number of steps for controlling the throttle valve remains unchanged based on the current number of steps.

[0148] S505: When the intake superheat difference is less than or equal to a second preset difference, control the first electronic expansion valve / the second electronic expansion valve to close by a second step.

[0149] In the above scheme, if the intake superheat difference does not exceed the second preset difference, the number of steps for controlling the throttle valve is reduced based on the current number of steps. The number of steps to be reduced can also be obtained based on the intake superheat difference.

[0150] In an embodiment of the present application, the current suction superheat of the compressor is obtained by converting the compressor suction port pressure into the refrigerant saturation temperature which can be compared with the suction temperature, and then the difference between the current suction superheat and the system target superheat is determined. Subsequently, the opening of the throttle valve can be adjusted according to the size of the above difference.

[0151] The following combination Figure 6 The specific embodiments illustrate the implementation process of adjusting the opening of the auxiliary valve according to the outlet temperature / new outlet temperature and the inlet temperature / new inlet temperature in the chassis deicing method of the present application.

[0152] Figure 6 The process of a chassis deicing method provided in the embodiment of the present application Figure Three .like Figure 6 As shown, the method includes:

[0153] S601. Determine the current supplementary air superheat based on the outlet temperature / new outlet temperature and the inlet temperature / new inlet temperature.

[0154] In the above scheme, the role of the economizer in the heat pump system is to supply air to the compressor and increase the compressor exhaust volume. Therefore, by calculating the temperature difference between the economizer outlet temperature and the inlet temperature, the current economizer air supply situation can be known. This temperature difference is the supply air superheat.

[0155] S602: Obtain the target supply air superheat of the economizer, and determine the supply air superheat difference based on the current supply air superheat and the target supply air superheat.

[0156] In this step, the target supply air superheat of the economizer is relatively certain during use. The difference between the supply air superheat and the target supply air superheat can be calculated, and the opening of the auxiliary valve is controlled according to this difference to adjust the heat exchange capacity of the economizer.

[0157] S603: When the difference in superheat of the supplementary air is greater than or equal to the first preset difference, the auxiliary valve is controlled to increase the third step number, wherein the third step number is determined according to the difference in superheat of the supplementary air.

[0158] In the above scheme, if the supplementary gas superheat difference exceeds the first preset difference, the step number of the auxiliary valve is increased based on the current step number, and the increased step number can be obtained according to the supplementary gas superheat difference. For example, the third step number can be 2-5 times the supplementary gas superheat difference, which is consistent with the previous embodiment.

[0159] S604, when the supplementary gas superheat difference is greater than the second preset difference and less than the first preset difference, the auxiliary valve is controlled to maintain the current opening degree.

[0160] In this step, if the supplementary gas superheat difference is between the second preset difference and the first preset difference, the step number of the auxiliary valve is maintained based on the current step number.

[0161] S605, when the supplementary gas superheat difference is less than or equal to the second preset difference, the auxiliary valve is controlled to close by a third step number.

[0162] In the above scheme, if the supplementary gas superheat difference does not exceed the second preset difference, the step number of the auxiliary valve is decreased based on the current step number, and the decreased step number can also be obtained according to the suction gas superheat difference.

[0163] In the embodiment of the present application, by calculating the difference between the inlet and outlet temperatures of the economizer, the current supplementary gas superheat of the compressor can be obtained, and then the difference between the current supplementary gas superheat and the system target superheat can be determined, and then the opening degree of the auxiliary valve can be adjusted according to the size of the above difference.

[0164] In the above method embodiment, in the control scheme of the electronic expansion valve and the auxiliary valve as a throttle valve, the preset threshold values corresponding to the suction gas superheat difference, the exhaust gas temperature difference and the supplementary gas superheat difference can be consistent or inconsistent. In order to make the data intuitive and clear, in the present application, the preset threshold values corresponding to the above three parameters are all first preset difference and second preset difference.

[0165] In combination with the above embodiments, the chassis deicing method provided in the embodiment of the present application changes the traditional single outdoor heat exchanger into N+1 outdoor heat exchangers, wherein N outdoor heat exchangers are connected to the N+1 outdoor heat exchanger through the second electronic expansion valve in parallel, and the N+1 outdoor heat exchanger is connected to the indoor heat exchanger through the first electronic expansion valve, so that the N+1 outdoor heat exchanger is located between the first electronic expansion valve and the second electronic expansion valve. In this way, one of the two electronic expansion valves is selected as a throttle valve, and the other is selected as a fully open valve, so that the switching of the N+1 outdoor heat exchanger between cold and hot states can be realized, and then after the defrosting of the heat pump system is completed and the heating mode is switched, the high temperature state of the N+1 outdoor heat exchanger is used to heat the defrosting water in the chassis, so as to avoid the defrosting water from freezing due to low temperature environment.

[0166] Figure 7 A structural schematic diagram of a chassis deicing device provided by an embodiment of the present application is shown in Figure 7 The chassis deicing device is applied to the heat pump system provided by the above embodiment, and can include various functional modules for implementing the chassis deicing method described above. Any functional module can be implemented by software or hardware.

[0167] For example, the chassis deicing device can include an acquisition module 701, a first processing module 702, and a second processing module 703.

[0168] The acquisition module 701 is configured to acquire an ambient temperature and an operating mode of the heat pump system.

[0169] The first processing module 702 is configured to acquire a suction temperature and a suction port pressure of a compressor, and an outlet temperature and an inlet temperature of an economizer when the ambient temperature is less than a first preset temperature and the heat pump system switches from a defrosting mode to a heating mode.

[0170] The second processing module 703 is configured to control the first electronic expansion valve to open to a maximum opening degree within a preset time length, adjust an opening degree of the second electronic expansion valve according to the suction temperature and the suction port pressure, and adjust an opening degree of the auxiliary valve according to the outlet temperature and the inlet temperature.

[0171] The chassis deicing device is configured to implement the technical solutions provided by the chassis deicing method embodiments described above, and has similar implementation principles and technical effects to the method embodiments described above, which will not be described here.

[0172] The present application also provides a computer-readable storage medium having computer-executable instructions stored therein, and when a processor executes the computer-executable instructions, the chassis deicing method described above is implemented.

[0173] The computer-readable storage medium described above can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0174] An example readable storage medium is coupled to the processor such that the processor can read information from the readable storage medium and can write information to the readable storage medium. Of course, the readable storage medium can also be a part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0175] The division of the units is only a logical function division, and in actual implementation, another division manner can be used, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or components shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0176] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, can be located in one place or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0177] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0178] If the functions are realized in the form of software function units and sold or used as independent products, the functions can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the part of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program code storage media.

[0179] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The foregoing program can be stored in a computer readable storage medium. The program executes to perform the steps of the above-mentioned method embodiments; and the foregoing storage medium includes various storage media that can store program codes, such as ROM, RAM, magnetic disk or optical disk.

[0180] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments, and the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat pump system, characterized by, The heat pump system comprises a compressor, an indoor heat exchanger, N+1 outdoor heat exchangers and an economizer, wherein, The N+1 outdoor heat exchangers are arranged at intervals along a vertical direction, N outdoor heat exchangers are connected to the N+1 outdoor heat exchanger through a second electronic expansion valve in parallel, the N+1 outdoor heat exchanger is connected to the indoor heat exchanger through a first electronic expansion valve, and N is a positive integer; The economizer is located between the N+1 outdoor heat exchanger and the compressor, and an auxiliary valve is arranged at an inlet position of the economizer.

2. The heat pump system of claim 1, wherein, A bottom disc for containing water is arranged below the N+1 outdoor heat exchanger, and part of an outlet pipeline of the N+1 outdoor heat exchanger is arranged in the bottom disc.

3. The heat pump system of claim 2, wherein, The heat pump system further comprises a four-way valve, and the compressor is connected to the indoor heat exchanger and the N+1 outdoor heat exchangers through the four-way valve. The N+1 outdoor heat exchangers are arranged at equal intervals along a vertical direction.

4. The heat pump system of claim 3, wherein, The heat pump system further comprises a driving board for driving the compressor to operate, and the driving board is located between the N+1 outdoor heat exchanger and the first electronic expansion valve.

5. A method of de-icing a surface, characterized in that, The method is applied to the heat pump system of any one of claims 1-4, and the method comprises: obtaining an ambient temperature and an operating mode of the heat pump system; when the ambient temperature is less than a first preset temperature and the heat pump system switches from a defrosting mode to a heating mode, obtaining a suction temperature and a suction port pressure of the compressor, and obtaining an outlet temperature and an inlet temperature of the economizer; controlling the first electronic expansion valve to open to a maximum opening degree within a preset time length, adjusting an opening degree of the second electronic expansion valve according to the suction temperature and the suction port pressure, and adjusting an opening degree of the auxiliary valve according to the outlet temperature and the inlet temperature.

6. The method of claim 5, wherein, After the preset time length, the method further comprises: obtaining a new suction temperature and a new suction port pressure, and obtaining a new outlet temperature and a new inlet temperature; adjusting the opening degree of the first electronic expansion valve according to the new suction temperature and the new suction port pressure, controlling the second electronic expansion valve to open to a maximum opening degree, and adjusting the opening degree of the auxiliary valve according to the new outlet temperature and the new inlet temperature.

7. The method of claim 5, wherein, The method further comprises: when the ambient temperature is less than the first preset temperature and the heat pump system operates in the defrosting mode, obtaining a discharge temperature of the compressor and a target discharge temperature; adjusting the opening degree of the first electronic expansion valve according to the discharge temperature and the target discharge temperature, controlling the second electronic expansion valve to open to a maximum opening degree, and controlling the auxiliary valve to be in a closed state.

8. The method of claim 7, wherein, The adjusting of the opening degree of the first electronic expansion valve according to the discharge temperature and the target discharge temperature comprises: obtaining a discharge temperature difference value based on the discharge temperature and the target discharge temperature; when the discharge temperature difference value is greater than or equal to a first preset difference value, controlling the first electronic expansion valve to increase by a first step number, wherein the first step number is determined according to the discharge temperature difference value; when the discharge temperature difference value is less than or equal to a second preset difference value, controlling the first electronic expansion valve to decrease by the first step number. When the exhaust temperature difference is greater than the second preset difference and less than a first preset difference, the first electronic expansion valve is controlled to maintain a current opening degree.

9. The method of claim 5, wherein, The method further comprises: When the ambient temperature is less than the first preset temperature and the heat pump system is operating in a heating mode, an intake temperature and an intake port pressure of the compressor are obtained, and an outlet temperature and an inlet temperature of the economizer are obtained; According to the intake temperature and the intake port pressure, the opening degree of the first electronic expansion valve is adjusted, the second electronic expansion valve is controlled to open to a maximum opening degree, and according to the outlet temperature and the inlet temperature, the opening degree of the auxiliary valve is adjusted to improve the heating capacity of the heat pump system.

10. The method of claim 5, wherein, The method further comprises: When the ambient temperature is greater than or equal to the first preset temperature and the heat pump system is operating in a heating mode, an intake temperature and an intake port pressure of the compressor are obtained; According to the intake temperature and the intake port pressure, the opening degree of the first electronic expansion valve is adjusted, the second electronic expansion valve is controlled to open to a maximum opening degree, and the auxiliary valve is controlled to be in a closed state.

11. The method of claim 5, wherein, The method further comprises: When the ambient temperature is less than or equal to a second preset temperature and the heat pump system is operating in a cooling mode, an intake temperature and an intake port pressure of the compressor are obtained, wherein the second preset temperature is greater than the first preset temperature; According to the intake temperature and the intake port pressure, the opening degree of the first electronic expansion valve is adjusted, the second electronic expansion valve is controlled to open to a maximum opening degree, and the auxiliary valve is controlled to be in a closed state.

12. The method of claim 5, wherein, The method further comprises: When the ambient temperature is greater than the second preset temperature and the heat pump system is operating in a cooling mode, an intake temperature and an intake port pressure of the compressor are obtained, and an outlet temperature and an inlet temperature of the economizer are obtained; According to the intake temperature and the intake port pressure, the opening degree of the first electronic expansion valve is adjusted, the second electronic expansion valve is controlled to open to a maximum opening degree, and according to the outlet temperature and the inlet temperature, the opening degree of the auxiliary valve is adjusted.

13. The method according to any one of claims 5-12, characterized in that, The adjusting of the opening degree of the first / second electronic expansion valve according to the intake temperature and the intake port pressure comprises: The intake port pressure is converted into a refrigerant saturation temperature, and a current intake superheat degree is calculated according to the intake temperature and the refrigerant saturation temperature; A target intake superheat degree of the compressor is obtained, and an intake superheat degree difference is determined according to the current intake superheat degree and the target intake superheat degree; The opening degree of the first / second electronic expansion valve is adjusted according to the intake superheat degree difference.

14. The method of claim 13, wherein, The adjusting of the opening degree of the first / second electronic expansion valve according to the intake superheat degree difference comprises: When the intake superheat degree difference is greater than or equal to a first preset difference, the first / second electronic expansion valve is controlled to increase by a second number of steps, wherein the second number of steps is determined according to the intake superheat degree difference; when the suction superheat difference value is less than or equal to a second preset difference value, controlling the first electronic expansion valve / second electronic expansion valve to close by a second step number, wherein the second preset difference value is less than the first preset difference value; when the suction superheat difference value is greater than the second preset difference value and less than the first preset difference value, controlling the first electronic expansion valve / second electronic expansion valve to keep a current opening degree.

15. The method of claim 5, 6, 9, or 12, wherein, The adjusting the opening degree of the auxiliary valve according to the outlet temperature / new outlet temperature and the inlet temperature / new inlet temperature comprises: determining a current supercharging superheat based on the outlet temperature / new outlet temperature and the inlet temperature / new inlet temperature; obtaining a target supercharging superheat of the economizer, and determining a supercharging superheat difference value according to the current supercharging superheat and the target supercharging superheat; when the supercharging superheat difference value is greater than or equal to a first preset difference value, controlling the auxiliary valve to increase by a third step number, wherein the third step number is determined according to the supercharging superheat difference value; when the supercharging superheat difference value is less than or equal to a second preset difference value, controlling the auxiliary valve to close by a third step number; when the supercharging superheat difference value is greater than the second preset difference value and less than the first preset difference value, controlling the auxiliary valve to keep a current opening degree.

16. A de-icing device for a wind turbine blade, the device comprising: The device is applied to the heat pump system according to any one of claims 1-4, and the device comprises: an obtaining module, configured to obtain an ambient temperature and an operation mode of the heat pump system; a first processing module, configured to, when the ambient temperature is less than a first preset temperature and the heat pump system is switched from a defrosting mode to a heating mode, obtain a suction temperature and a suction port pressure of the compressor, and obtain an outlet temperature and an inlet temperature of the economizer; a second processing module, configured to, within a preset time length, control the first electronic expansion valve to open to a maximum opening degree, adjust an opening degree of the second electronic expansion valve according to the suction temperature and the suction port pressure, and adjust an opening degree of the auxiliary valve according to the outlet temperature and the inlet temperature.

17. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by a processor, implements the steps of the chassis deicing method according to any one of claims 5-15.

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