Air conditioning system and control method thereof

Abstract

The embodiment of the invention provides an air conditioning system and a control method thereof, relates to the technical field of air conditioners, and is used for cleaning a plate heat exchanger when the filth blockage problem of the plate heat exchanger occurs. The air conditioning system includes: a compressor; a plate heat exchanger; a circulating water pump; a three-way valve; the first stop valve is arranged between the three-way valve and the plate heat exchanger; the second stop valve is arranged between the circulating water pump and the plate heat exchanger; the controller is configured to obtain operation parameters of the air conditioning system; wherein the operation parameters comprise the use duration of the air conditioning system and the exhaust pressure of a compressor; and under the condition that the operation parameters meet the first self-cleaning condition, the second end and the third end of the three-way valve are controlled to be opened, the first end of the three-way valve is closed, the first stop valve is opened, and the second stop valve is closed, so that the water flow direction between the circulating water pump and the plate heat exchanger is switched from the first flow direction to the second flow direction.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an air conditioning system and a control method thereof. Background Art

[0002] Plate heat exchangers are high-efficiency heat exchangers made of a group of stacked metal plates with a certain corrugated shape. Plate heat exchangers are widely used in different types of air-conditioning systems due to their high heat exchange efficiency, low heat loss, compact and lightweight structure, small footprint, wide application and long service life.

[0003] However, the thickness of the metal plate of the plate heat exchanger is very thin. When the heat exchange medium contains large particles or fiber materials, it is very easy to cause the metal plate to become dirty and blocked, which not only affects the heat exchange efficiency, but also affects the reliability of the whole machine. Therefore, the plate heat exchanger needs to be cleaned in time.

[0004] At present, the method of cleaning plate heat exchangers is usually to disassemble the plate heat exchanger and clean the metal plates one by one. This method is time-consuming and labor-intensive, and frequent assembly and disassembly is prone to leakage. Therefore, how to clean the plate heat exchanger when the plate heat exchanger is dirty and blocked has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present application provides an air conditioning system and a control method thereof, which are used to clean a plate heat exchanger when the plate heat exchanger is dirty or clogged.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions.

[0007] In a first aspect, an embodiment of the present application provides an air-conditioning system, which includes: a compressor; a plate heat exchanger; a circulating water pump, which is arranged on the water inlet pipe of the plate heat exchanger and is used to input water into the plate heat exchanger for heat exchange; a three-way valve, which is connected to the plate heat exchanger and is used to control the water flow direction between the circulating water pump and the plate heat exchanger; the water flow direction includes a first flow direction in the working mode of the air-conditioning system and a second flow direction in the self-cleaning mode; a first stop valve, which is arranged between the three-way valve and the plate heat exchanger; a second stop valve, which is arranged between the circulating water pump and the plate heat exchanger; a controller, which is configured to: obtain operating parameters of the air-conditioning system; wherein the operating parameters include the usage time of the air-conditioning system and the exhaust pressure of the compressor; when the operating parameters meet the first self-cleaning condition, control the second end and the third end of the three-way valve to open, the first end of the three-way valve to close, the first stop valve to open, and the second stop valve to close, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first flow direction to the second flow direction.

[0008] The technical solution provided by the embodiment of the present application brings at least the following beneficial effects: the air-conditioning system provided by the present application can determine whether the self-cleaning condition is met according to the operating parameters of the air-conditioning system. And when the operating parameters of the air-conditioning system meet the self-cleaning condition, the second end and the third end of the three-way valve are controlled to be opened, the first end of the three-way valve is closed, the first stop valve is opened, and the second stop valve is closed, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first flow direction to the second flow direction, thereby realizing reverse flushing of the plate heat exchanger to clean the dirty and blocked substances (such as dust, scale, etc.) in the plate heat exchanger. And compared with forward flushing of the plate heat exchanger, reverse flushing of the plate heat exchanger can better clean the dirty and blocked substances inside the plate heat exchanger, thereby improving the cleaning efficiency of the plate heat exchanger, and then improving the heat exchange efficiency of the plate heat exchanger.

[0009] In some embodiments, the first self-cleaning condition includes: the usage time of the air conditioning system is greater than or equal to the preset usage time, and the absolute value of the difference between the exhaust pressure of the compressor and the historical exhaust pressure is greater than or equal to the preset threshold.

[0010] In some embodiments, the air conditioning system also includes: a flow meter, arranged on the water outlet pipe of the plate heat exchanger, for detecting the water outlet of the plate heat exchanger; a controller, further configured to: detect the water outlet of the plate heat exchanger through the flow meter; when the water outlet of the plate heat exchanger meets the second self-cleaning condition, control the second end and the third end of the three-way valve to open, the first end of the three-way valve to close, the first stop valve to open, and the second stop valve to close, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first direction to the second direction.

[0011] In some embodiments, the second self-cleaning condition includes: the water output of the plate heat exchanger is less than or equal to a preset cleaning water volume, and the water output of the plate heat exchanger is greater than or equal to a preset shutdown water volume.

[0012] In some embodiments, the historical exhaust pressure is any one of the exhaust pressures of multiple compressors at multiple times within a preset usage time of the air conditioning system.

[0013] In a second aspect, an embodiment of the present application provides a control method for an air-conditioning system, which is applied to the air-conditioning system, and the method includes: obtaining operating parameters of the air-conditioning system; wherein the operating parameters include the usage time of the air-conditioning system and the exhaust pressure of the compressor; when the operating parameters meet the first self-cleaning condition, controlling the second end and the third end of the three-way valve to open, the first end of the three-way valve to close, the first stop valve to open, and the second stop valve to close, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first flow direction to the second flow direction.

[0014] In some embodiments, the first self-cleaning condition includes: the usage time of the air conditioning system is greater than or equal to the preset usage time, and the absolute value of the difference between the exhaust pressure of the compressor and the historical exhaust pressure is greater than or equal to the preset threshold.

[0015] In some embodiments, the method also includes: detecting the water output of the plate heat exchanger through a flow meter; when the water output of the plate heat exchanger meets the second self-cleaning condition, controlling the second end and the third end of the three-way valve to open, the first end of the three-way valve to close, the first stop valve to open, and the second stop valve to close, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first direction to the second direction.

[0016] In some embodiments, the second self-cleaning condition includes: the water output of the plate heat exchanger is less than or equal to a preset cleaning water volume, and the water output of the plate heat exchanger is greater than or equal to a preset shutdown water volume.

[0017] In some embodiments, the historical exhaust pressure is any one of the exhaust pressures of multiple compressors at multiple times within a preset usage time of the air conditioning system.

[0018] In a third aspect, an embodiment of the present application provides a controller comprising: one or more processors; one or more memories; wherein the one or more memories are used to store computer program codes, the computer program codes include computer instructions, and when the one or more processors execute the computer instructions, the controller executes any one of the air-conditioning system control methods provided in the second aspect.

[0019] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which includes computer instructions. When the computer instructions are executed on a computer, the computer executes any one of the air-conditioning system control methods provided in the second aspect.

[0020] In a fifth aspect, an embodiment of the present invention provides a computer program product, which can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can implement any air-conditioning system control method provided in the second aspect.

[0021] It should be noted that the above computer instructions may be stored in whole or in part on a computer-readable storage medium, wherein the computer-readable storage medium may be packaged together with the processor of the controller, or may be packaged separately from the processor of the controller, which is not limited in this application.

[0022] The beneficial effects described in the second to fifth aspects of the present application can be referred to the beneficial effect analysis of the first aspect and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0024] Figure 1 A schematic diagram of the composition of an air conditioning system provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the structure of an air conditioning system provided in an embodiment of the present application;

[0026] Figure 3 A connection diagram of a four-way valve provided in an embodiment of the present application;

[0027] Figure 4 A connection diagram of another four-way valve provided in an embodiment of the present application;

[0028] Figure 5 A connection diagram of a three-way valve provided in an embodiment of the present application;

[0029] Figure 6 A connection diagram of another three-way valve provided in an embodiment of the present application;

[0030] Figure 7 A schematic diagram of the structure of another air conditioning system provided in an embodiment of the present application;

[0031] Figure 8 A schematic diagram of the hardware structure of an air conditioning system provided in an embodiment of the present application;

[0032] Fig. 9 A flow chart of a control method for an air conditioning system provided in an embodiment of the present application;

[0033] Fig.10 A schematic diagram of water flow direction in a working mode of an air conditioning system provided in an embodiment of the present application;

[0034] Fig.11 A schematic diagram of water flow in a self-cleaning mode of an air conditioning system provided in an embodiment of the present application;

[0035] Fig.12 A flow chart of another method for controlling an air conditioning system provided in an embodiment of the present application;

[0036] Fig.13 A flow chart of another method for controlling an air conditioning system provided in an embodiment of the present application;

[0037] Fig.14 Another schematic diagram of water flow direction in the working mode of the air conditioning system provided by an embodiment of the present application;

[0038] Fig.15 Another schematic diagram of water flow in the self-cleaning mode of an air conditioning system provided in an embodiment of the present application;

[0039] Fig.16 A flowchart of another method for controlling an air-conditioning system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, when describing a pipeline, the "connected" and "connection" used in this application have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0044] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0045] At present, when the plate heat exchanger is dirty and blocked, a fan can be used for self-cleaning. The disadvantage is that large particles cannot be completely cleaned and the cleaning efficiency is low.

[0046] Based on this, an embodiment of the present application provides a control method for an air-conditioning system, which can determine whether the self-cleaning condition is met according to the operating parameters of the air-conditioning system. And when the operating parameters of the air-conditioning system meet the self-cleaning condition, the second end and the third end of the three-way valve are controlled to open, the first end of the three-way valve is closed, the first stop valve is opened, and the second stop valve is closed, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first flow direction to the second flow direction, thereby realizing reverse flushing of the plate heat exchanger. Compared with forward flushing of the plate heat exchanger, reverse flushing of the plate heat exchanger can better clean the dirty and blocked materials inside the plate heat exchanger, thereby improving the cleaning efficiency of the plate heat exchanger, and then improving the heat exchange efficiency of the plate heat exchanger.

[0047] The air conditioning system in the embodiment of the present application performs a refrigeration cycle of the air conditioning system by using a compressor, a condenser, an electronic expansion valve, an evaporator and a four-way valve as a refrigerant circulation loop. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0048] The compressor compresses the refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0049] The electronic expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the electronic expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioning system can adjust the temperature of the indoor space.

[0050] The outdoor unit of the air conditioning system refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioning system includes an indoor heat exchanger, and the expansion valve may be provided in the indoor unit or the outdoor unit.

[0051] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioning system functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioning system functions as a cooler in a cooling mode.

[0052] Figure 1 FIG. 1 is a schematic diagram of the composition of an air conditioning system provided by the present application according to an exemplary embodiment. Figure 1As shown, the air conditioning system 10 includes an indoor unit 11, an outdoor unit 12, a remote controller 13 and a controller 14 ( Figure 1 not shown).

[0053] The indoor unit 11 is an indoor hanging unit as an example, and the indoor hanging unit is usually installed on an indoor wall, etc. For another example, an indoor cabinet unit is also a form of indoor unit of the indoor unit.

[0054] The outdoor unit 12 is usually installed outdoors and can be connected to multiple indoor units 11 for indoor environment heat exchange. Figure 1 In the figure, since the outdoor unit 12 is located outdoors on the opposite side of the indoor unit 11 across the wall, the outdoor unit 12 is indicated by a dotted line.

[0055] The remote controller 13 has a function of communicating with the controller 14 using infrared rays or other communication methods, for example. The remote controller is used for the user to perform various controls on the air conditioning system and realize the interaction between the user and the air conditioning system 10.

[0056] In some embodiments, the remote controller 13 has a display panel and function buttons, including a running switch, a temperature setting switch, a wind direction setting switch, and a wind volume setting switch, and the user can use these function buttons to operate these switches. Among them, the running switch is a switch for switching between the operation and stop of the air conditioning system 10. Whenever the running switch is operated, the air conditioning system 10 switches alternately between operation and stop. The temperature setting switch is a switch for inputting the indoor temperature desired by the user. In addition, the wind direction setting switch is a switch for making settings related to the wind direction, and the wind volume setting switch is a switch for inputting the wind volume.

[0057] Figure 2 FIG. 1 is a schematic diagram of the structure of an air conditioning system provided by the present application according to an exemplary embodiment. Figure 2 As shown, the air conditioning system 10 includes an indoor unit 11, an outdoor unit 12, a three-way valve 131, a circulating water pump 132, a first stop valve 133, a second stop valve 134 and a controller 14 ( Figure 2 not shown).

[0058] The indoor unit 11 includes an indoor heat exchanger 111 . The outdoor unit 12 includes a compressor 121 , a four-way valve 122 , an outdoor heat exchanger 123 , and a gas-liquid separator 124 .

[0059] In some embodiments, the indoor heat exchanger 111 has a first inlet and outlet for allowing liquid refrigerant to flow between the indoor throttling device and a second inlet and outlet for allowing gas refrigerant to flow between the indoor throttling device and the suction port of the compressor 121. The indoor heat exchanger 111 allows the refrigerant flowing in the heat transfer pipe connected between the first inlet and the second inlet to exchange heat with the indoor air.

[0060] The indoor throttling device is used to adjust the refrigerant flow in the air conditioning system pipeline. For example, the indoor throttling device is an electronic expansion valve, which has the function of expanding and reducing the pressure of the refrigerant flowing through the electronic expansion valve, and can be used to adjust the supply of the refrigerant in the pipeline.

[0061] In some embodiments, the compressor 121 is disposed between the outdoor throttling device and the gas-liquid separator 124 , and is used to compress the refrigerant delivered by the gas-liquid separator 124 , and deliver the compressed refrigerant to the outdoor throttling device via the four-way valve 122 .

[0062] In some embodiments, the four ports of the four-way valve 122 are respectively connected to the compressor 121, the outdoor heat exchanger 123, the gas-liquid separator 124 and the indoor heat exchanger 111. The four-way valve 122 is used to achieve mutual conversion between cooling and heating by changing the flow direction of the refrigerant in the system pipeline.

[0063] Exemplarily, the four ports of the four-way valve 122 are respectively a D port, an E port, an S port, and a C port. The D port of the four-way valve 122 is connected to the compressor 121, the E port of the four-way valve 122 is connected to the indoor heat exchanger 111, the S port of the four-way valve 122 is connected to the gas-liquid separator 124, and the C port of the four-way valve 122 is connected to the outdoor heat exchanger 123. In the cooling mode, Figure 3 As shown in the figure, the D port of the four-way valve is connected to the C port, and the E port is connected to the S port. In the heating mode, Figure 4 As shown, the D port of the four-way valve is connected to the E port, and the C port is connected to the S port.

[0064] In some embodiments, the refrigerant side of the outdoor heat exchanger 123 has a third inlet and outlet for circulating the refrigerant between the four-way valve 122 and the discharge port of the compressor 121, and has a fourth inlet and outlet for circulating the refrigerant between the outdoor heat exchanger 123 and the outdoor throttling device. The other side of the outdoor heat exchanger is provided with a water inlet and a water outlet, which are connected to the circulating water pump 132 to form a circulation loop of the water system. The outdoor heat exchanger 123 allows the refrigerant flowing in the heat transfer pipe connected between the third inlet and the fourth inlet to exchange heat with the water in the water system.

[0065] The outdoor heat exchanger 123 is a plate heat exchanger. For ease of description, the outdoor heat exchanger 123 is referred to as a plate heat exchanger below. The outdoor throttling device is used to adjust the refrigerant flow in the air conditioning system pipeline. For example, the outdoor throttling device is an electronic expansion valve, which has the function of expanding and reducing the pressure of the refrigerant flowing through the electronic expansion valve, and can be used to adjust the supply of the refrigerant in the pipeline.

[0066] In some embodiments, the outlet of the gas-liquid separator 124 is connected to the inlet of the compressor 121, and the inlet of the gas-liquid separator 124 is connected to the S port of the four-way valve 122. In the gas-liquid separator 124, taking the refrigeration cycle as an example, the refrigerant flowing from the indoor heat exchanger 111 to the compressor 121 via the four-way valve 122 is separated into gas refrigerant and liquid refrigerant. In addition, the gas refrigerant is mainly supplied from the gas-liquid separator 124 to the discharge port of the compressor 121.

[0067] In some embodiments, the three ports of the three-way valve 131 are respectively connected to the plate heat exchanger 123, the circulating water pump 132 and the second stop valve 134, and are used to control the water flow direction between the circulating water pump 132 and the plate heat exchanger 123. The water flow direction includes a first flow direction in the working mode of the air-conditioning system 10 and a second flow direction in the self-cleaning mode; the working mode includes a heating mode and a cooling mode.

[0068] Exemplarily, the three ports of the three-way valve are respectively a first end M, a second end N and a third end P. The first end M is connected to the plate heat exchanger 123, the second end N is connected to the second stop valve 134, and the third end is connected to the circulating water pump 132. Figure 5 As shown, in the working mode of the air conditioning system, the first end M and the third end P of the three-way valve are opened, and the second end N is closed, so that the first end M and the third end P of the three-way valve are connected. Figure 6 As shown, in the self-cleaning mode of the air conditioning system, the second end N and the third end P of the three-way valve are opened, and the first end M is closed, so that the second end N and the third end P of the three-way valve are connected.

[0069] In some embodiments, the circulating water pump 132 is disposed on the water inlet pipeline of the plate heat exchanger 123 for inputting water into the plate heat exchanger 123 for heat exchange with the refrigerant.

[0070] In some embodiments, the first stop valve 133 is disposed between the three-way valve 131 and the plate heat exchanger 123 to transport waste water after cleaning the plate heat exchanger 123 .

[0071] In some embodiments, the second stop valve 134 is disposed on the water outlet pipeline of the plate heat exchanger 123 to assist the three-way valve 131 in controlling the water flow direction between the circulating water pump 132 and the plate heat exchanger 123 .

[0072] In some embodiments, the controller 14 refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the air conditioning system 10 to execute the control instruction. Exemplarily, the controller can be a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller can also be other devices with processing functions, such as circuits, devices, or software modules, and the embodiments of the present application do not impose any restrictions on this.

[0073] In addition, the controller 14 can be used to control the operation of various components inside the air-conditioning system 10 so that the various components of the air-conditioning system 10 can operate to achieve various predetermined functions of the air-conditioning system 10.

[0074] Exemplarily, the controller 14 obtains operating parameters of the air-conditioning system 10 , wherein the operating parameters include the usage time of the air-conditioning system 10 and the exhaust pressure of the compressor 121 .

[0075] Furthermore, when the operating parameters meet the first self-cleaning condition, the controller 14 controls the second end and the third end of the three-way valve 131 to open, the first end of the three-way valve 131 to close, the first stop valve 133 to open, and the second stop valve 134 to close, so as to switch the water flow direction between the circulating water pump 132 and the outdoor heat exchanger 123 from the first direction to the second direction.

[0076] The first self-cleaning condition includes: the usage time of the air-conditioning system 10 is greater than or equal to the preset usage time, and the absolute value of the difference between the exhaust pressure of the compressor 121 and the historical exhaust pressure is greater than or equal to the preset threshold.

[0077] In some embodiments, Figure 7 As shown, the air conditioning system 10 may further include a water flow meter 135 .

[0078] In some embodiments, the water flow meter 135 is disposed on the water outlet pipeline of the plate heat exchanger 123 , and one end of the water flow meter 135 is connected to the second stop valve 134 for detecting the water outlet of the plate heat exchanger 123 .

[0079] Exemplarily, when the operating parameters meet the second self-cleaning condition, the controller 14 controls the second end and the third end of the three-way valve 131 to open, the first end of the three-way valve 131 to close, the first stop valve 133 to open, and the second stop valve 134 to close, so as to switch the water flow direction between the circulating water pump 132 and the outdoor heat exchanger 123 from the first direction to the second direction.

[0080] The second self-cleaning condition includes: the water output of the plate heat exchanger is less than or equal to the preset cleaning water volume, and the water output of the plate heat exchanger is greater than or equal to the preset shutdown water volume.

[0081] Figure 8 This is a hardware configuration block diagram of an air conditioning system provided by the present application according to an exemplary embodiment. Figure 8 As shown, the air conditioning system 10 may further include one or more of the following: a first temperature sensor 201 , a second temperature sensor 202 , an exhaust pressure sensor 203 , a communicator 204 , and a memory 205 .

[0082] In some embodiments, the first temperature sensor 201 is disposed at the water inlet of the plate heat exchanger 123 to detect the water inlet temperature of the plate heat exchanger 123 .

[0083] In some embodiments, the second temperature sensor 202 is disposed at the water outlet of the plate heat exchanger 123 to detect the outlet water temperature of the plate heat exchanger 123 .

[0084] In some embodiments, the exhaust pressure sensor 203 is disposed at the exhaust port of the compressor 121 to detect the exhaust pressure of the compressor 121 .

[0085] In some embodiments, the communicator 204 is used to establish a communication connection with other network entities, such as establishing a communication connection with a terminal device. The communicator 204 may include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module. Taking the RF module as an example, the RF module can be used to receive and send signals, in particular, send the received information to the controller 14 for processing; in addition, send the signal generated by the controller 14. Typically, the RF circuit may include but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc.

[0086] In some embodiments, the memory 205 can be used to store software programs and data, such as operating parameters of the air conditioning system 10. The controller 14 executes various functions and data processing of the air conditioning system 10 by running the software programs or data stored in the memory 205. The memory 205 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. The memory 205 stores an operating system that enables the air conditioning system 10 to operate. In the present application, the memory 205 can store an operating system and various application programs, and can also store code for executing the control method of the air conditioning system provided in the embodiment of the present application.

[0087] Those skilled in the art will understand that Figure 8 The hardware structure shown in the figure does not constitute a limitation on the air conditioning system. The air conditioning system may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0088] The embodiments provided in this application are described in detail below in conjunction with the accompanying drawings.

[0089] like Fig. 9 As shown, the embodiment of the present application provides a control method for an air conditioning system, the method comprising the following steps:

[0090] S101. A controller obtains operating parameters of an air-conditioning system.

[0091] Among them, the operating parameters include the usage time of the air-conditioning system and the exhaust pressure of the compressor.

[0092] In some embodiments, in the working mode of the air-conditioning system, that is, during the working process of the air-conditioning system, the controller can obtain the usage time of the air-conditioning system through a timer, and obtain the exhaust pressure of the compressor through an exhaust pressure sensor.

[0093] Among them, the working modes include heating mode and cooling mode.

[0094] In one example, the controller may receive a self-cleaning detection instruction issued by a user, and execute step S101 based on the instruction. For example, when the air-conditioning system needs to perform self-cleaning, the user may send a self-cleaning detection instruction to the air-conditioning system through a terminal device connected to the air-conditioning system or a remote controller of the air-conditioning system, and then the air-conditioning system responds to the self-cleaning detection instruction, and the controller obtains the usage time of the air-conditioning system through a timer, and obtains the exhaust pressure of the compressor through an exhaust pressure sensor.

[0095] In another example, the controller can periodically perform self-cleaning detection on the air conditioning system. For example, the controller can obtain the use time of the air conditioning system through a timer at a preset time interval, and obtain the exhaust pressure of the compressor through an exhaust pressure sensor.

[0096] Optionally, the preset time interval may be pre-set when the air-conditioning system leaves the factory, or may be obtained from other air-conditioning systems, and the embodiment of the present application does not impose any special restrictions on this.

[0097] In some embodiments, after acquiring the operating parameters of the air conditioning system, the controller stores the operating parameters of the air conditioning system in a memory, wherein the operating parameters also include the operating frequency of the compressor, the outlet water temperature of the plate heat exchanger, and the inlet water temperature.

[0098] Exemplarily, the control stores 20 groups of operating parameters of the air-conditioning system in the memory. The operating parameters of the air-conditioning system stored in the memory are shown in Table 1 below.

[0099] Table 1

[0100] Serial number Operating frequency Inlet water temperature Outlet water temperature Exhaust pressure 1 Operating frequency Ⅰ Inlet water temperature 1 Outlet water temperature 1 Exhaust pressure 1 2 Operating frequency Ⅱ Inlet water temperature 2 Water outlet temperature 2 Exhaust pressure 2 3 Operating frequency Ⅲ Inlet water temperature 3 Water outlet temperature 3 Exhaust pressure 3 … … … … … 19 Operating frequency ⅲ Inlet water temperature 19 Water outlet temperature 19 Exhaust pressure 19 20 Operating frequency ⅳ Inlet water temperature 20 Water outlet temperature 20 Exhaust pressure 20

[0101] S102. When the operating parameters meet the first self-cleaning condition, the controller controls the second end and the third end of the three-way valve to open, the first end of the three-way valve to close, the first stop valve to open, and the second stop valve to close, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first direction to the second direction.

[0102] In some embodiments, the first self-cleaning condition includes that the usage time of the air conditioning system is greater than or equal to a preset usage time, and the absolute value of the difference between the exhaust pressure of the compressor and the historical exhaust pressure is greater than or equal to a preset threshold.

[0103] It is understandable that the dirty blockage problem in the plate heat exchanger is usually caused by the gradual accumulation of impurities such as dust and scale during the long-term use of the air-conditioning system. If the use time of the air-conditioning system is greater than or equal to the preset use time, it means that the use time of the air-conditioning system is long and the plate heat exchanger is prone to dirty blockage. Therefore, the first self-cleaning condition can include that the use time of the air-conditioning system is greater than or equal to the preset use time.

[0104] In addition, since the exhaust pressure of the compressor will change when the plate heat exchanger is dirty or clogged, it is possible to further determine whether the plate heat exchanger has a dirty or clogged problem based on the absolute value of the difference between the exhaust pressure of the plate heat exchanger and the historical exhaust pressure.

[0105] Optionally, the preset threshold may be 0.5 MPa.

[0106] In some embodiments, the historical exhaust pressure may be any one of the exhaust pressures of multiple compressors at multiple times within a preset usage time of the air-conditioning system.

[0107] It is understandable that within the preset usage time of the air-conditioning system, the plate heat exchanger is not prone to dirt and blockage problems. Therefore, the exhaust pressure of the compressor within the preset usage time can better reflect the change in the exhaust pressure of the compressor when the plate heat exchanger has dirt and blockage problems.

[0108] Optionally, the preset usage period may be half a year.

[0109] In some embodiments, in the working mode of the air conditioning system, the second stop valve, the first end and the third end of the three-way valve are in an open state, and the first stop valve and the second end of the three-way valve are in a closed state.

[0110] In some embodiments, when the operating parameters of the air-conditioning system do not meet the first self-cleaning condition, the controller controls the operating mode of the air-conditioning system to remain unchanged, and controls the first end and the third end of the three-way valve to be opened, the second end of the three-way valve to be closed, the first stop valve to be closed, and the second stop valve to be opened, so that the first flow direction between the circulating water pump and the plate heat exchanger remains unchanged.

[0111] For example, Fig.10 As shown, when the operating parameters of the air-conditioning system do not meet the first self-cleaning condition, that is, the plate heat exchanger does not need self-cleaning, the water input by the circulating water pump to the plate heat exchanger passes through the third end P and the first end M of the three-way valve in sequence, enters the plate heat exchanger from the water inlet of the plate heat exchanger, and after the water exchanges heat with the refrigerant in the plate heat exchanger, it flows out from the water outlet of the plate heat exchanger.

[0112] In some embodiments, when the operating parameters of the air-conditioning system meet the first self-cleaning condition, the controller switches the operating mode of the air-conditioning system to the self-cleaning mode, and controls the second end and the third end of the three-way valve to open, the first end of the three-way valve to close, the first stop valve to open, and the second stop valve to close, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first direction to the second direction.

[0113] For example, Fig.11 As shown, when the operating parameters of the air-conditioning system meet the first self-cleaning condition, that is, the plate heat exchanger needs to be self-cleaned, the water input by the circulating water pump to the plate heat exchanger passes through the third end P and the second end N of the three-way valve in sequence, and enters the plate heat exchanger from the water outlet of the plate heat exchanger to flush the dirty and blocked substances in the plate heat exchanger. The turbid water flushed out flows out from the water inlet of the plate heat exchanger and is discharged out of the pipeline through the first stop valve to achieve self-cleaning of the plate heat exchanger.

[0114] The following is combined with Fig.12 The flowchart shown exemplarily introduces the complete process of the control method of the air-conditioning system.

[0115] like Fig.12 As shown, the process starts.

[0116] S11. The controller obtains operating parameters of the air-conditioning system.

[0117] Determine whether the usage time of the air conditioning system is greater than or equal to the preset usage time.

[0118] If yes, execute the following step S12.

[0119] If not, execute the following step S14.

[0120] S12. The controller determines the absolute value of the difference between the exhaust pressure of the compressor and the historical exhaust pressure according to the exhaust pressure of the compressor and the historical exhaust pressure.

[0121] Determine whether the absolute value of the difference is greater than or equal to a preset threshold.

[0122] If yes, execute the following step S13.

[0123] If not, execute the following step S14.

[0124] S13, the controller controls the second end and the third end of the three-way valve to open, the first end of the three-way valve to close, the first stop valve to open, and the second stop valve to close.

[0125] S14, the controller controls the first end and the third end of the three-way valve to open, the second end of the three-way valve to close, the first stop valve to close, and the second stop valve to open.

[0126] based on Fig. 9 In the embodiment shown, the embodiment of the present application provides a control method for an air-conditioning system, which can determine whether the self-cleaning condition is met according to the operating parameters of the air-conditioning system. And when the operating parameters of the air-conditioning system meet the self-cleaning condition, the second end and the third end of the three-way valve are controlled to open, the first end of the three-way valve is closed, the first stop valve is opened, and the second stop valve is closed, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first flow direction to the second flow direction, thereby realizing reverse flushing of the plate heat exchanger. Compared with forward flushing of the plate heat exchanger, reverse flushing of the plate heat exchanger can better clean the dirty and blocked materials inside the plate heat exchanger, thereby improving the cleaning efficiency of the plate heat exchanger, and then improving the heat exchange efficiency of the plate heat exchanger.

[0127] In some embodiments, Fig.13 As shown, the method also includes the following steps:

[0128] S201. The controller obtains the water output of the plate heat exchanger.

[0129] In some embodiments, in the working mode of the air-conditioning system, that is, in the working process of the air-conditioning system, the controller can obtain the water outlet of the plate heat exchanger through a water flow meter disposed on the water outlet pipe of the plate heat exchanger.

[0130] In one example, a user can send a self-cleaning detection instruction to the air-conditioning system through a terminal device connected to the air-conditioning system or a remote control of the air-conditioning system, and the air-conditioning system responds to the self-cleaning detection instruction, and the controller obtains the water output of the plate heat exchanger through a water flow meter.

[0131] In another example, the controller may obtain the water output of the plate heat exchanger through a water flow meter at preset time intervals.

[0132] Optionally, the preset time interval may be pre-set when the air-conditioning system leaves the factory, or may be obtained from other air-conditioning systems, and the embodiment of the present application does not impose any special restrictions on this.

[0133] S202. When the water output of the plate heat exchanger meets the second self-cleaning condition, the controller controls the second end and the third end of the three-way valve to open, the first end of the three-way valve to close, the first stop valve to open, and the second stop valve to close, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first direction to the second direction.

[0134] In some embodiments, the second self-cleaning condition includes: the water output of the plate heat exchanger is less than or equal to a preset cleaning water volume, and the water output of the plate heat exchanger is greater than or equal to a preset shutdown water volume.

[0135] It is understandable that if the plate heat exchanger is clogged with dirt, the channel inside the plate heat exchanger will become narrower, the resistance will increase, and the amount of water flowing out of the plate heat exchanger will become smaller. Therefore, it is possible to determine whether the plate heat exchanger has a dirty blockage problem based on the water output of the plate heat exchanger.

[0136] Optionally, the preset cleaning water volume may be pre-set when the air-conditioning system leaves the factory, or may be obtained from other air-conditioning systems, and the embodiments of the present application do not impose any special restrictions on this.

[0137] It is understandable that if the water output of the plate heat exchanger is less than or equal to the preset clean water volume, it means that the water output of the plate heat exchanger is small and a dirty blockage problem may have occurred. If the water output of the plate heat exchanger is greater than or equal to the preset clean water volume, it means that the water output of the plate heat exchanger is normal and there is no dirty blockage problem.

[0138] In some embodiments, when the water output of the plate heat exchanger is greater than a preset clean water volume, the controller controls the first end and the third end of the three-way valve to open, the second end of the three-way valve to close, the first stop valve to close, and the second stop valve to open, so that the first flow direction between the circulating water pump and the plate heat exchanger remains unchanged.

[0139] For example, Fig.14 As shown, for the description of keeping the first flow direction between the circulating water pump and the plate heat exchanger unchanged, reference may be made to the description of the first flow direction between the circulating water pump and the plate heat exchanger in step S102. Fig. 9 The detailed description of the illustrated embodiment will not be repeated here.

[0140] In some embodiments, when the water output of the plate heat exchanger is less than or equal to a preset clean water volume and less than a preset shutdown water volume, the controller controls the air-conditioning system to shut down to protect the air-conditioning system.

[0141] It should be noted that if the water output of the plate heat exchanger is less than or equal to the preset shutdown water volume, it means that the amount of water flowing through the plate heat exchanger is too small, which will cause heat accumulation inside the plate heat exchanger, causing the plate heat exchanger to overheat. In order to prevent further problems or failures in the air conditioning system, it is necessary to control the air conditioning system to shut down.

[0142] In some embodiments, when the water output of the plate heat exchanger is less than or equal to the preset clean water volume and greater than or equal to the preset shutdown water volume, the controller controls the second end and the third end of the three-way valve to open, the first end of the three-way valve to close, the first stop valve to open, and the second stop valve to close, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first direction to the second direction.

[0143] For example, Fig.15 As shown, for the description of switching the water flow direction between the circulating water pump and the plate heat exchanger from the first flow direction to the second flow direction, reference can be made to the description of the above step S102 regarding Fig.10 The detailed description of the illustrated embodiment will not be repeated here.

[0144] The following is combined with Fig.16 The flowchart shown exemplarily introduces the complete process of the control method of the air-conditioning system.

[0145] like Fig.16 As shown, the process starts.

[0146] S21. The controller obtains the water output of the plate heat exchanger.

[0147] Determine whether the water output is less than or equal to the preset cleaning water volume.

[0148] If yes, execute the following step S22.

[0149] If not, execute the following step S24.

[0150] S22, determining whether the water output is greater than or equal to the preset shutdown water volume.

[0151] If yes, execute the following step S23.

[0152] If not, execute the following step S25.

[0153] S23, the controller controls the second end and the third end of the three-way valve to open, the first end of the three-way valve to close, the first stop valve to open, and the second stop valve to close.

[0154] S24, the controller controls the first end and the third end of the three-way valve to open, the second end of the three-way valve to close, the first stop valve to close, and the second stop valve to open.

[0155] S25: The controller controls the air conditioning system to shut down.

[0156] An embodiment of the present application also provides a computer-readable storage medium, which includes computer-executable instructions. When the computer-executable instructions are executed on a computer, the computer executes the method provided in the above embodiment.

[0157] The embodiment of the present application also provides a computer program product, which can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can implement the method provided in the above embodiment.

[0158] Those skilled in the art will appreciate that in one or more of the above examples, the functions described in the present invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented using software, the functions may be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium may be any available medium that a general or special-purpose computer can access.

[0159] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0160] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An air conditioning system, characterized in that: include: compressor; Plate heat exchanger; A circulating water pump, arranged on the water inlet pipeline of the plate heat exchanger, for inputting water into the plate heat exchanger for heat exchange; A three-way valve connected to the plate heat exchanger, used to control the water flow direction between the circulating water pump and the plate heat exchanger; the water flow direction includes a first flow direction in the working mode of the air-conditioning system and a second flow direction in the self-cleaning mode; A first stop valve, disposed between the three-way valve and the plate heat exchanger; A second stop valve is provided between the circulating water pump and the plate heat exchanger; The controller is configured as: Acquire operating parameters of the air conditioning system; wherein the operating parameters include the use time of the air conditioning system and the exhaust pressure of the compressor; When the operating parameters meet the first self-cleaning condition, the second end and the third end of the three-way valve are controlled to open, the first end of the three-way valve is closed, the first stop valve is opened, and the second stop valve is closed, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first flow direction to the second flow direction.

2. The air conditioning system according to claim 1, characterized in that: The first self-cleaning condition includes: The usage time of the air-conditioning system is greater than or equal to a preset usage time, and the absolute value of the difference between the exhaust pressure of the compressor and the historical exhaust pressure is greater than or equal to a preset threshold.

3. The air conditioning system according to claim 1 or 2, characterized in that: The air conditioning system further comprises: A flow meter, arranged on the water outlet pipe of the plate heat exchanger, for detecting the water outlet volume of the plate heat exchanger; The controller is further configured to: Detecting the water output of the plate heat exchanger by means of the flow meter; When the water output of the plate heat exchanger meets the second self-cleaning condition, the second end and the third end of the three-way valve are controlled to be opened, the first end of the three-way valve is closed, the first stop valve is opened, and the second stop valve is closed, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first flow direction to the second flow direction.

4. The air conditioning system according to claim 3, characterized in that: The second self-cleaning condition includes: The water output of the plate heat exchanger is less than or equal to a preset clean water volume, and the water output of the plate heat exchanger is greater than or equal to a preset shutdown water volume.

5. The air conditioning system according to claim 2, characterized in that: The historical exhaust pressure is any one of the exhaust pressures of multiple compressors of the air-conditioning system at multiple times within the preset usage time.

6. A control method for an air conditioning system, characterized in that: include: Acquire operating parameters of the air conditioning system; wherein the operating parameters include the use time of the air conditioning system and the exhaust pressure of the compressor; When the operating parameters meet the first self-cleaning condition, the second end and the third end of the three-way valve are controlled to open, the first end of the three-way valve is closed, the first stop valve is opened, and the second stop valve is closed, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first flow direction to the second flow direction.

7. The method according to claim 6, characterized in that The first self-cleaning condition includes: The usage time of the air-conditioning system is greater than or equal to a preset usage time, and the absolute value of the difference between the exhaust pressure of the compressor and the historical exhaust pressure is greater than or equal to a preset threshold.

8. The method according to claim 6 or 7, characterized in that: The method further comprises: Detecting the water output of the plate heat exchanger by means of a flow meter; When the water output of the plate heat exchanger meets the second self-cleaning condition, the second end and the third end of the three-way valve are controlled to be opened, the first end of the three-way valve is closed, the first stop valve is opened, and the second stop valve is closed, so as to switch the water flow direction between the circulating water pump and the plate heat exchanger from the first flow direction to the second flow direction.

9. The method according to claim 8, characterized in that The second self-cleaning condition includes: The water output of the plate heat exchanger is less than or equal to a preset clean water volume, and the water output of the plate heat exchanger is greater than or equal to a preset shutdown water volume.

10. The method according to claim 7, characterized in that The historical exhaust pressure is any one of the exhaust pressures of multiple compressors of the air-conditioning system at multiple times within the preset usage time.

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