Air conditioner

Abstract

The invention relates to an air conditioner comprising a refrigerant loop in which a refrigerant circulates through a compressor, an outdoor heat exchanger, a throttle valve and an indoor heat exchanger in sequence; a heating element; the heat dissipation device comprises a heat dissipation pipe, and a refrigerant inlet and a refrigerant outlet are formed in the two opposite ends of the heat dissipation pipe respectively; the first pipeline is arranged on the periphery of the refrigerant loop between the throttling valve and the outdoor heat exchanger in a sleeving mode, and a first inlet and a first outlet are formed in the two opposite ends of the first pipeline; one end of the second pipeline communicates with a refrigerant outlet of the radiating pipe, and the other end of the second pipeline communicates with a first inlet of the first pipeline; one end of the third pipeline communicates with a first outlet of the first pipeline, and the other end of the third pipeline communicates with a refrigerant inlet of the heat dissipation pipe; a refrigerant in the radiating pipe absorbs heat generated by the heating element and flows to the first pipeline through the second pipeline; the refrigerant loop absorbs heat of the refrigerant in the first pipeline, and the refrigerant flows back into the heat dissipation pipe through the second pipeline so as to dissipate heat of the heating element.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and in particular to an air conditioner. Background Art

[0002] The air conditioner is composed of indoor heat exchanger, outdoor heat exchanger, expansion valve and other components. Some air conditioners also include capillary tubes, splitters and other components. The function of the indoor heat exchanger and outdoor heat exchanger is to exchange heat in the refrigerant circuit. The flow of refrigerant in the indoor heat exchanger and outdoor heat exchanger is affected by flow resistance, which inevitably produces pressure loss, causing the heat exchange capacity of the indoor heat exchanger and outdoor heat exchanger to decrease, further affecting the cooling and heating effects of the air conditioner.

[0003] In order to reduce the impact of refrigerant pressure loss, multiple flow paths will be designed at the inlet and outlet of the indoor heat exchanger or the outdoor heat exchanger. These flow paths are connected in parallel, and the sum of the refrigerant amounts in all flow paths is the total refrigerant amount in the air-conditioning system. The characteristic of this parallel relationship flow path is that the amount of refrigerant in each flow path is small, which can effectively reduce the pressure loss caused by the refrigerant flow.

[0004] Each flow path of the indoor heat exchanger or outdoor heat exchanger needs to match a different amount of refrigerant to achieve the optimal heat exchange effect. The amount of refrigerant is adjusted by the specification difference of the capillary tube, and the capillary tube is located between the heat exchanger and the distributor.

[0005] In the air conditioning heating mode, the outdoor heat exchanger is used as an evaporator. The refrigerant returned from the indoor heat exchanger is throttled by the expansion valve and then enters the capillary tubes corresponding to each outdoor heat exchanger flow path through the liquid distributor. The capillaries of different specifications are throttled to produce refrigerants of different flow rates and then enter the corresponding outdoor heat exchanger flow paths. In the design and selection process of the capillary tubes, the capillary tube specifications corresponding to each flow path need to be tested many times. This process involves disassembling and assembling the capillary tubes, and adapting different capillary tube specifications to balance the amount of refrigerant in each flow path. The workload is huge and consumes laboratory resources.

[0006] In view of this, this application is filed. Summary of the invention

[0007] The present invention solves one of the technical problems in the related art at least to a certain extent.

[0008] To this end, the present application aims to provide an air conditioner to help improve the accuracy of selecting capillaries in the air conditioner.

[0009] To achieve the above object, the present invention provides an air conditioner, comprising:

[0010] An outdoor heat exchanger, the outdoor heat exchanger serving as a condenser of an air conditioner;

[0011] A flow divider, the flow divider comprises a flow divider head and a plurality of flow divider tubes, and the inlets of the plurality of flow divider tubes are all connected to the flow divider head;

[0012] An electronic expansion valve connected between the outdoor heat exchanger and at least a plurality of the shunt pipes, the electronic expansion valve and the shunt pipes being connected via a first refrigerant circuit, and the electronic expansion valve and the outdoor heat exchanger being connected via a second refrigerant circuit;

[0013] a stop valve, which is provided in at least a portion of the first refrigerant circuit and at least a portion of the second refrigerant circuit, and the stop valve is used to cut off the refrigerant flowing in the first refrigerant circuit or the second refrigerant circuit;

[0014] A first pressure detection device, which is arranged on a refrigerant circuit connected to the flow splitter, and is used to detect the pressure of the first refrigerant flowing into the flow splitter;

[0015] A second pressure detection device, which is arranged on the second refrigerant circuit and is used to detect the second refrigerant pressure on the corresponding second refrigerant circuit after flowing through the electronic expansion valve;

[0016] The controller is configured to: when the refrigerant flows through the diverter, the electronic expansion valve and the outdoor heat exchanger in sequence, perform a first logical operation based on the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the refrigerant flow through the electronic expansion valve, and the difference between the first refrigerant pressure and the second refrigerant pressure is positively correlated with the corresponding refrigerant flow of the electronic expansion valve.

[0017] In some embodiments of the present application, the controller is configured to: after obtaining the refrigerant flow through the electronic expansion valve through the first logical operation, perform a second logical operation based on the refrigerant flow through the electronic expansion valve to obtain the length of the capillary.

[0018] In some embodiments of the present application, after performing a second logical operation on the refrigerant flow rate of the electronic expansion valve to obtain the length of the capillary, the stop valve is closed to cut off the refrigerant flowing in the first refrigerant circuit and the second refrigerant circuit, and the capillary of the corresponding length replaces the corresponding electronic expansion valve.

[0019] In some embodiments of the present application, the first logic includes: performing the first logic operation based on the flow area A of the electronic expansion valve corresponding to the second refrigerant pressure, the throttling index of the electronic expansion valve, and the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the refrigerant flow rate passing through the electronic expansion valve.

[0020] In some embodiments of the present application, the first logic is: Q=K*A*ΔPm, wherein Q is the refrigerant flow rate through the electronic expansion valve, K is a constant, A is the flow area of ​​the electronic expansion valve, ΔP is the difference between the first refrigerant pressure and the second refrigerant pressure, and m is the throttling index of the electronic expansion valve.

[0021] In some embodiments of the present application, the diameter of the inner wall of the capillary to be replaced is selected;

[0022] The second logic includes: performing a second logical operation based on the diameter of the inner wall of the capillary, the refrigerant flow rate through the electronic expansion valve, the difference between the first refrigerant pressure and the second refrigerant pressure, the friction coefficient of the refrigerant flow in the capillary, the refrigerant specific volume at the capillary inlet and the refrigerant specific volume at the capillary outlet to obtain the length of the capillary to be replaced.

[0023] In some embodiments of the present application, the second logic is: L = D * ΔP / [f * Q 2 *(v1-v2)], wherein L is the length of the capillary to be replaced, D is the diameter based on the inner wall of the capillary, ΔP is the difference between the first refrigerant pressure and the second refrigerant pressure, f is the friction coefficient of the refrigerant flow in the capillary, Q is the refrigerant flow rate through the electronic expansion valve, v1 is the refrigerant specific volume at the capillary inlet, and v2 is the refrigerant specific volume at the capillary outlet.

[0024] In some embodiments of the present application, the difference between the first refrigerant pressure and the second refrigerant pressure is positively correlated with the length of the capillary tube to be replaced.

[0025] In some embodiments of the present application, the refrigerant flow rate passing through the corresponding electronic expansion valve is negatively correlated with the length of the capillary tube to be replaced.

[0026] On the other hand, the present application also provides an air conditioner, comprising:

[0027] An indoor heat exchanger, the indoor heat exchanger serving as a condenser of an air conditioner;

[0028] A flow divider, the flow divider comprises a flow divider head and a plurality of flow divider tubes, and the inlets of the plurality of flow divider tubes are all connected to the flow divider head;

[0029] An electronic expansion valve connected between the indoor heat exchanger and at least a plurality of the shunt pipes, the electronic expansion valve and the shunt pipes being connected via a first refrigerant circuit, and the electronic expansion valve and the indoor heat exchanger being connected via a second refrigerant circuit;

[0030] a stop valve, which is provided in at least a portion of the first refrigerant circuit and at least a portion of the second refrigerant circuit, and the stop valve is used to cut off the refrigerant flowing in the first refrigerant circuit or the second refrigerant circuit;

[0031] A first pressure detection device, which is arranged on a refrigerant circuit connected to the flow splitter, and is used to detect the pressure of the first refrigerant flowing out of the flow splitter;

[0032] A second pressure detection device, which is arranged on the second refrigerant circuit and is used to detect the second refrigerant pressure on the corresponding second refrigerant circuit after flowing through the electronic expansion valve;

[0033] The controller is configured to: when the refrigerant flows through the indoor heat exchanger, the electronic expansion valve and the diverter in sequence, perform a first logical operation based on the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the refrigerant flow through the electronic expansion valve, and the difference between the first refrigerant pressure and the second refrigerant pressure is positively correlated with the corresponding refrigerant flow of the electronic expansion valve.

[0034] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the overall structure of an air conditioner according to one embodiment of the present application;

[0036] Figure 2 The overall structure of the indoor unit of the air conditioner according to one embodiment of the present application is shown in FIG. Figure 1 ;

[0037] Figure 3 The overall structure of the indoor unit of the air conditioner according to one embodiment of the present application is shown in FIG. Figure 2 ;

[0038] Figure 4 is a hardware configuration block diagram according to one embodiment of the present application;

[0039] Figure 5 is a schematic structural diagram of a refrigerant circulation circuit of an air conditioner according to one embodiment of the present application;

[0040] Figure 6 is a schematic diagram of the installation positions of the first pressure detection device and the second pressure detection device according to one embodiment of the present application;

[0041] Figure 7 is a schematic diagram of the installation of a second pressure detection device and a stop valve according to one embodiment of the present application;

[0042] Figure 8 is a schematic structural diagram of an electronic expansion valve according to one embodiment of the present application;

[0043] Fig. 9 is a schematic diagram of the installation of a first pressure detection device and a stop valve according to one embodiment of the present application;

[0044] Fig.10 It is a schematic diagram of the position of an external thermocouple according to one embodiment of the present application.

[0045] In the above figures: air conditioner indoor unit 100; air conditioner outdoor unit 200; casing air inlet 11; outer air guide plate 13; compressor 12; outdoor heat exchanger 14; four-way valve 15; indoor heat exchanger 16; throttling expansion valve 17; liquid distributor 18; first pressure detection device 21; second pressure detection device 22; stop valve 3; electronic expansion valve 4; nut 5; thermocouple 6; controller 71; bus 81; memory 82; processor 83; communication interface 84. DETAILED DESCRIPTION

[0046] In the description of the present invention, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0050] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0051] In this application, the air conditioner includes an air conditioner indoor unit 100 and an air conditioner outdoor unit 200. When the air conditioner operates in a cooling mode, the air conditioner performs a refrigeration cycle of the air conditioner indoor unit 100 by using a compressor 12, an outdoor heat exchanger 14, an expansion valve and an indoor heat exchanger 16.

[0052] The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air, provides cooling to the indoor space through the refrigerant's heat absorption process, and achieves temperature regulation of the indoor space.

[0053] The compressor 12 compresses the low-temperature and low-pressure refrigerant gas to discharge the high-temperature and high-pressure refrigerant gas, and the discharged refrigerant gas flows into the outdoor heat exchanger 14. The outdoor heat exchanger 14 condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0054] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the outdoor heat exchanger 14 into a low-pressure liquid-phase refrigerant.

[0055] The indoor heat exchanger 16 evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure refrigerant gas to the compressor 12. The indoor heat exchanger 16 can achieve a cooling effect by exchanging heat with indoor air using latent heat of evaporation of the refrigerant.

[0056] During the entire refrigeration cycle, the air conditioner indoor unit 100 can adjust the temperature of the indoor space.

[0057] When the air conditioner operates in a heating mode, the air conditioner performs a heating cycle of the air conditioner indoor unit 100 through the compressor 12 , the outdoor heat exchanger 14 , the expansion valve and the indoor heat exchanger 16 .

[0058] The heating cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air, provides heat to the indoor space through the heat release process of the refrigerant, and realizes temperature regulation of the indoor space.

[0059] When the heating cycle is running, the compressor 12 compresses the refrigerant gas in a low-temperature and low-pressure state and discharges the refrigerant gas in a high-temperature and high-pressure state, and the discharged refrigerant gas flows into the indoor heat exchanger 16. The indoor heat exchanger 16 condenses the compressed refrigerant into a liquid phase, and the heat generated by the condensation is heat-exchanged with the indoor air flowing through the indoor heat exchanger 16, thereby increasing the indoor temperature.

[0060] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the outdoor heat exchanger 14 into a low-pressure liquid-phase refrigerant.

[0061] The outdoor heat exchanger 14 evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low temperature and low pressure state to the compressor 12. The outdoor heat exchanger 14 can exchange heat with the outdoor air by utilizing the latent heat of evaporation of the refrigerant, and the outdoor fan drives the outdoor air to exchange heat with the outdoor heat exchanger.

[0062] During the entire heating cycle, the air conditioner indoor unit 100 can adjust the temperature of the indoor space.

[0063] The air conditioner outdoor unit 200 includes at least a compressor 12 and an outdoor heat exchanger 14 , the air conditioner indoor unit 100 includes at least an indoor heat exchanger 16 , and an expansion valve may be provided in the air conditioner indoor unit 100 or the air conditioner outdoor unit 200 .

[0064] The indoor heat exchanger 16 and the outdoor heat exchanger 14 function as a condenser or an evaporator. When the indoor heat exchanger 16 functions as a condenser, the air conditioner indoor unit 100 functions as a heater in a heating mode, and when the indoor heat exchanger 16 functions as an evaporator, the air conditioner indoor unit 100 functions as a cooler in a cooling mode.

[0065] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0066] As attached Figures 1 to 10 As shown, in one embodiment of the air conditioner of the present invention.

[0067] The air conditioner includes an indoor unit 100 and an outdoor unit 200. The outdoor unit 200 includes at least a compressor 12, a gas-liquid separator, a four-way valve 15, an expansion valve, a liquid separator 18, and a plurality of electronic expansion valves 4 disposed between the liquid separator 18 and the outdoor heat exchanger 14.

[0068] The air conditioner indoor unit 100 at least comprises: a housing, a base, a heat exchange fan and an indoor heat exchanger 16. This embodiment takes an air conditioner wall mounted unit as an example. Of course, the air conditioner can also be configured as an air conditioner cabinet unit. The housing forms the overall appearance of the air conditioner indoor unit 100.

[0069] The air conditioner indoor unit 100 is usually installed at a location such as an indoor wall surface, etc. The air conditioner outdoor unit 200 is usually installed outdoors for heat exchange in an outdoor environment.

[0070] The air conditioner is also provided with a control device, which is exemplarily a remote controller, which has the function of communicating with the controller 71 using infrared or other communication methods. The remote controller is used for the user to perform various controls on the air conditioner and realize the interaction between the user and the air conditioner.

[0071] Taking the air conditioner as an example, the casing air inlet 11 is opened at the top of the casing, and the casing air outlet is opened at the front side of the casing and arranged near the bottom of the casing. Indoor air enters the casing through the casing air inlet 11 and flows back to the room through the casing air outlet.

[0072] The base is arranged inside the casing, and a heat exchange air duct is formed inside the base, which connects the casing air inlet 11 and the casing air outlet on the casing. Indoor air enters the casing from the casing air inlet 11, passes through the heat exchange air duct, and is blown out from the casing air outlet.

[0073] The indoor heat exchanger 16 is disposed inside the casing, and the refrigerant flowing inside the indoor heat exchanger exchanges heat with the indoor air to form a heating cycle or a cooling cycle. After passing through the indoor heat exchanger 16, the indoor air flows to the outside of the casing through the casing air outlet.

[0074] The heat exchange fan is arranged in the heat exchange air duct inside the casing and is located below the indoor heat exchanger 16. The heat exchange fan extends along the length direction of the casing. The heat exchange fan can be a cross-flow fan. When the heat exchange fan is started, the indoor air is introduced into the casing through the casing air inlet 11 by the drive of the heat exchange fan, and after heat exchange in the indoor heat exchanger 16, it flows into the room through the casing air outlet. The heat exchange fan is used to provide power for the indoor air to flow from the casing air inlet 11 through the casing to the casing air outlet.

[0075] Indoor air enters the casing through the casing air inlet 11, exchanges heat with the indoor heat exchanger 16, and then flows out from the casing air outlet on the casing to the indoor space, thereby realizing the indoor air supply.

[0076] The indoor heat exchanger 16 further includes an inner air guide plate and an outer air guide plate 13, wherein the inner air guide plate is disposed at the air outlet of the casing and is located inside the casing, and the outer air guide plate 13 is disposed at the air outlet of the casing of the air conditioner indoor unit 100, and the casing air outlet is connected to the casing air inlet 11. Driven by the heat exchange fan, indoor air enters the casing through the casing air inlet 11, flows through the indoor heat exchanger 16, and is discharged into the indoor space through the casing air outlet.

[0077] In the air conditioner indoor unit 100, the inner air guide plate can swing back and forth to sweep the indoor air. The outer air guide plate 13 can rotate up and down to sweep the indoor air and adjust the outflow direction of the air outlet of the housing.

[0078] The air conditioner of the present application includes an indoor heat exchanger 16, an outdoor heat exchanger 14, a compressor 12, an expansion valve, and a refrigerant circuit for circulating refrigerant. The indoor heat exchanger 16 and the outdoor heat exchanger 14 are both connected to the compressor 12. The expansion valve is a throttling expansion valve 17, which is connected between the indoor heat exchanger 16 and the outdoor heat exchanger 14 and can expand the liquid refrigerant that has undergone a condensation process into a low-pressure liquid refrigerant. The expansion valve can be provided in the air conditioner indoor unit 100 or the air conditioner outdoor unit 200.

[0079] The compressor 12 includes an air intake port and an air exhaust port. The refrigerant that absorbs heat and undergoes an evaporation process enters the compressor 12 from the air intake port. The compressor 12 compresses the gaseous refrigerant into a high-temperature and high-pressure state and then discharges it from the exhaust port.

[0080] The indoor heat exchanger 16 and the outdoor heat exchanger 14 are respectively connected to the compressor 12 through the four-way valve 15 in the refrigerant circuit. The four-way valve 15 includes a first valve port, a second valve port, a third valve port and a fourth valve port. Among them, the air intake port of the compressor 12 is fixedly connected to the first valve port, and the air discharge port of the compressor 12 is fixedly connected to the third valve port.

[0081] In the refrigerant circuit, the refrigerant can circulate sequentially through the compressor 12, the outdoor heat exchanger 14, the expansion valve, and the indoor heat exchanger 16.

[0082] When the air conditioner is in cooling mode, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port. When the air conditioner is in heating mode, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port.

[0083] In some embodiments, the flow splitter includes a flow splitter head and a flow splitter tube, and an inlet of the flow splitter tube is connected to the flow splitter head.

[0084] The diverter head is a shower-head-shaped diverter, and the inlets of multiple diverter pipes are all connected to the diverter head. The refrigerant in the refrigerant circuit enters the diverter head and is then distributed to each diverter pipe.

[0085] An electronic expansion valve 4 is correspondingly connected between the outdoor heat exchanger 14 and at least a plurality of branch pipes. Each electronic expansion valve 4 may be respectively configured with a controller 71, or may share the same controller 71. When sharing the same controller 71, the controller 71 has a plurality of output ports, and each electronic expansion valve 4 is respectively connected to a different output port. The controller 71 is used to control the electronic expansion valve 4 to perform an opening control action.

[0086] The electronic expansion valve 4 is connected to the shunt pipe via a first refrigerant circuit, and the electronic expansion valve 4 is connected to the outdoor heat exchanger 14 via a second refrigerant circuit. The number of first refrigerant circuits corresponds to the number of electronic expansion valves connected thereto; the number of second refrigerant circuits corresponds to the number of electronic expansion valves 4 connected thereto.

[0087] There are multiple first pressure detection devices 21, which are arranged on the refrigerant circuit connected to the splitter, and are used to detect the pressure of the first refrigerant flowing into the splitter, and send the detection result to the controller 71 in the form of a first detection signal. The controller 71 is used to control the opening of the corresponding electronic expansion valve 4 according to the first detection signal sent by the first pressure detection device 21.

[0088] There are multiple second pressure detection devices 22, which are arranged on the second refrigerant circuit, and are used to detect the second refrigerant pressure on the corresponding second refrigerant circuit after flowing through the electronic expansion valve 4, and send the detection result to the controller 71 in the form of a second detection signal. The controller 71 is used to control the opening of the corresponding electronic expansion valve 4 according to the second detection signal sent by the second pressure detection device 22.

[0089] At least part of the first refrigerant circuit and at least part of the second refrigerant circuit are provided with a stop valve 3, and the stop valve 3 is used to cut off the refrigerant flowing in the first refrigerant circuit or the second refrigerant circuit.

[0090] It can be arranged that a stop valve 3 is provided on the first refrigerant circuit on the refrigerant inlet side of the electronic expansion valve 4 and on the second refrigerant circuit on the refrigerant outlet side of the electronic expansion valve 4. After the refrigerant flowing through the electronic expansion valve 4 is cut off by the stop valve 3, the electronic expansion valve 4 can be removed from the air conditioner, thereby facilitating replacement of a capillary tube that can play the same throttling role.

[0091] The controller 71 is configured as follows: when the refrigerant flows through the diverter, the electronic expansion valve 4 and the outdoor heat exchanger 14 in sequence, a first logical operation is performed based on the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the refrigerant flow through the electronic expansion valve 4, and the difference between the first refrigerant pressure and the second refrigerant pressure is positively correlated with the refrigerant flow of the corresponding electronic expansion valve 4.

[0092] The embodiment of the present application also provides a hardware structure diagram of a controller 71, the controller 71 includes a processor 83, and optionally, also includes a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82 and the communication interface 84 are connected via a bus 81.

[0093] The processor 83 may be a central processing unit 83 (CPU), a general processor 83, a network processor 83 (NP), a digital signal processor 83 (DSP), a microprocessor 83, a microcontroller 718, a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device having a processing function, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-CPU processor 83 or a multi-CPU processor 83. The processor 83 here may refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0094] The memory 82 may be a read-only memory 82 (ROM) or other types of static storage devices that can store static information and instructions, a random access memory 82 (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory 82 (EEPROM) read-only compact disc (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage medium or other magnetic storage device or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, and the embodiment of the present application does not impose any restrictions on this. The memory 82 may exist independently or be integrated with the processor 83. Among them, the memory 82 may contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, so as to realize the control method of the air conditioner provided in the embodiment of the present application.

[0095] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. The communication interface 84 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0096] The bus 81 may be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81. The bus 81 may be divided into an address bus 81, a data bus 81, a control bus 81, etc. Figure 4 Only one thick line is used in the figure, but it does not mean that there is only one bus 81 or only one type of bus 81.

[0097] Exemplarily, the first pressure detection device 21 can be set as a first pressure gauge, and the second pressure detection device 22 can be set as a second pressure gauge, the first pressure gauge is used to detect the first refrigerant pressure at a certain time and position, and send the detected first refrigerant pressure to the controller 71. The second pressure gauge is used to detect the second refrigerant pressure at a certain time and position, and send the detected second refrigerant pressure to the controller 71.

[0098] The controller 71 is configured to: when the refrigerant flows through the diverter, the electronic expansion valve 4 and the outdoor heat exchanger 14 in sequence, a first logic operation is performed based on the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the refrigerant flow through the electronic expansion valve 4, wherein the difference between the first refrigerant pressure and the second refrigerant pressure is positively correlated with the refrigerant flow of the corresponding electronic expansion valve 4. That is, when the difference between the first refrigerant pressure and the second refrigerant pressure is larger, it means that the refrigerant flow through the electronic expansion valve 4 is larger at this time.

[0099] When the refrigerant flows through the diverter, the electronic expansion valve 4 and the outdoor heat exchanger 14 in sequence, the outdoor heat exchanger 14 is used as an evaporator, and the electronic expansion valve 4 acts as a capillary tube between the refrigerant flow path of the diverter and the outdoor heat exchanger 14. When the entire air-conditioning system runs to a stable state, the opening of the throttling expansion valve 17400 of the air-conditioning outdoor unit 200 no longer changes. After the operating frequency of the compressor 12100 stabilizes, it starts to calculate the refrigerant flow through the electronic expansion valve 4, and then based on the refrigerant flow through the electronic expansion valve 4, a second logical operation is performed to obtain the specifications of the capillary tube of the electronic expansion valve 4 to be replaced.

[0100] After performing a second logic operation on the refrigerant flow rate of the electronic expansion valve to obtain the length of the capillary tube, the stop valve 3 is closed to cut off the refrigerant flowing in the first refrigerant circuit and the second refrigerant circuit, thereby facilitating the removal of the electronic expansion valve 4 to prevent refrigerant leakage. The capillary tube of the corresponding specification is replaced with the corresponding electronic expansion valve 4.

[0101] The specifications of the capillary include the length and the width of the inner diameter. When the length of the capillary is determined, only the selected size of the inner diameter of the capillary needs to be determined. Similarly, when the size of the inner diameter of the capillary is determined, only the selected size of the length of the capillary needs to be determined.

[0102] In the heating mode, the refrigerant flows out of the compressor 12, passes through the four-way valve 15 and the indoor heat exchanger 16, and the refrigerant returned by the indoor heat exchanger 16 is throttled by the throttling expansion valve 17 and enters the electronic expansion valves 4 connected to each flow path through the liquid distributor 18. The air conditioner can be externally connected to a computer terminal, the controller 71 and the expansion valve are connected through a coil, and the computer terminal is connected to the controller 71 through 485 communication. A control signal can be sent to the controller 71 through the computer terminal, thereby controlling the opening size of each electronic expansion valve 4.

[0103] Therefore, in the air conditioner of the present embodiment, the designer controls the opening size of the corresponding electronic expansion valve 4 through a computer terminal according to the refrigerant flow requirement of each flow path of the outdoor heat exchanger 14, until the opening size of the electronic expansion valve 4 is found when the second refrigerant pressure of the refrigerant flow path of each outdoor heat exchanger 14 is roughly equal.

[0104] Then, based on the conversion relationship between the opening size of the electronic expansion valve 4 and the length and inner diameter of the capillary, the specifications of the capillary corresponding to the refrigerant flow path of each outdoor heat exchanger 14 are obtained, and then the corresponding capillary replaces the electronic expansion valve 4 and is connected to the refrigerant flow path of the outdoor heat exchanger 14 for verification.

[0105] Compared with the existing method for adapting the capillary specifications, the method for the air conditioner of this embodiment is simpler and easier to operate, has a short matching time, and does not waste laboratory resources.

[0106] The number of electronic expansion valves 4 is consistent with the number of refrigerant flow paths of the outdoor heat exchanger 14, and can be one, two or more. The more the number of refrigerant flow paths of the outdoor heat exchanger 14 is, the higher the matching efficiency of this embodiment is.

[0107] In some embodiments, the electronic expansion valve 4 includes: an expansion valve and a cap 5, and the caps 5 are respectively connected to both ends of the refrigerant inlet and the refrigerant outlet of the expansion valve. The function of the cap 5 is to be connected to the stop valve 3 on the outdoor heat exchanger 14 side or to the stop valve 3 on the liquid distributor 18 side, so as to facilitate the replacement of the capillary to replace the electronic expansion valve 4.

[0108] The first logic includes: performing a first logic operation based on the flow area A of the electronic expansion valve 4 corresponding to the second refrigerant pressure, the throttling index of the electronic expansion valve 4, and the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the refrigerant flow through the electronic expansion valve 4.

[0109] In some embodiments, the first logic is: Q=K*A*ΔPm, where Q is the refrigerant flow rate through the electronic expansion valve 4, K is a constant, A is the flow area of ​​the electronic expansion valve 4, ΔP is the difference between the first refrigerant pressure and the second refrigerant pressure, and m is the throttling index of the electronic expansion valve 4.

[0110] The difference between the first refrigerant pressure and the second refrigerant pressure is easier to detect, and the values ​​detected by the first pressure detection device 21 and the second pressure detection device 22 are more accurate. The flow area of ​​the electronic expansion valve 4 and the throttling index of the electronic expansion valve 4 can be obtained through the parameter lookup table provided by the manufacturer of the electronic expansion valve 4, and the acquisition method is more convenient.

[0111] The present application can obtain the refrigerant flow of the electronic expansion valve 4 without measuring a large number of parameters, thereby reducing the detection of a large number of parameters and making the error rate of deviation accumulation smaller, thereby making the detected refrigerant flow of the electronic expansion valve 4 more accurate.

[0112] In some embodiments, after confirming the diameter of the inner wall of the capillary to be replaced, the length of the capillary can be obtained only through the second logical operation. The selection of the length is easier and more flexible than the selection of the inner diameter of the capillary, which can improve the matching efficiency of the capillary in the air conditioner.

[0113] The second logic includes: performing a second logical operation based on the diameter of the inner wall of the capillary, the refrigerant flow rate through the electronic expansion valve 4, the difference between the first refrigerant pressure and the second refrigerant pressure, the friction coefficient of the refrigerant flow in the capillary, the refrigerant specific volume at the capillary inlet and the refrigerant specific volume at the capillary outlet to obtain the length of the capillary to be replaced.

[0114] In some embodiments, the second logic is: L = D * ΔP / [f * Q 2 *(v1-v2)], where L is the length of the capillary to be replaced, D is the diameter based on the inner wall of the capillary, ΔP is the difference between the first refrigerant pressure and the second refrigerant pressure, f is the friction coefficient of the refrigerant flow in the capillary, Q is the refrigerant flow rate through the electronic expansion valve 4, v1 is the refrigerant specific volume at the capillary inlet, and v2 is the refrigerant specific volume at the capillary outlet.

[0115] The difference between the first refrigerant pressure and the second refrigerant pressure is positively correlated with the length of the capillary tube to be replaced. The greater the difference between the first refrigerant pressure and the second refrigerant pressure, the greater the length of the capillary tube required to be selected under the same inner diameter of the capillary tube.

[0116] The refrigerant flow rate through the corresponding electronic expansion valve 4 is negatively correlated with the length of the capillary to be replaced. The larger the refrigerant flow rate through the corresponding electronic expansion valve 4, the smaller the length of the capillary required to be selected under the same inner diameter size of the capillary.

[0117] When the length of the capillary tube to be selected by the second logical operation, the friction coefficient of the refrigerant flow in the capillary tube, the refrigerant specific volume at the capillary tube inlet, and the refrigerant specific volume at the capillary tube outlet can be obtained by looking up the physical property table of the corresponding refrigerant. Therefore, it is only necessary to calculate the diameter of the capillary tube and the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the accurate length of the capillary tube to be selected.

[0118] In the second logical operation of the present application, the second logical operation requires fewer parameters to be detected, which reduces the detection of a large number of parameters and makes the error rate of accumulated deviations smaller, thereby making the value of the capillary length obtained by the operation more accurate.

[0119] In some embodiments of the present application, the electronic expansion valve 4 is connected between the indoor heat exchanger 16 and at least a plurality of shunt pipes, the electronic expansion valve 4 and the shunt pipes are connected via a third refrigerant circuit, and the electronic expansion valve 4 and the indoor heat exchanger 16 are connected via a fourth refrigerant circuit.

[0120] The stop valve 3 is disposed in at least a portion of the third refrigerant circuit and at least a portion of the fourth refrigerant circuit. The stop valve 3 is used to cut off the refrigerant flowing in the third refrigerant circuit or the fourth refrigerant circuit.

[0121] The first pressure detection device 21 is arranged on the refrigerant circuit connected to the flow splitter, and is used to detect the pressure of the first refrigerant flowing out of the flow splitter. The second pressure detection device 22 is arranged on the fourth refrigerant circuit, and is used to detect the pressure of the second refrigerant on the corresponding fourth refrigerant circuit before flowing through the electronic expansion valve 4.

[0122] The controller 71 is configured as follows: when the refrigerant flows through the indoor heat exchanger 16, the electronic expansion valve 4 and the diverter in sequence, a first logical operation is performed based on the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the refrigerant flow through the electronic expansion valve 4, and the difference between the first refrigerant pressure and the second refrigerant pressure is positively correlated with the refrigerant flow of the corresponding electronic expansion valve 4.

[0123] In some embodiments, the first logic is: Q=K*A*ΔPm, where Q is the refrigerant flow rate through the electronic expansion valve 4, K is a constant, A is the flow area of ​​the electronic expansion valve 4, ΔP is the difference between the first refrigerant pressure and the second refrigerant pressure, and m is the throttling index of the electronic expansion valve 4.

[0124] The difference between the first refrigerant pressure and the second refrigerant pressure is easier to detect, and the values ​​detected by the first pressure detection device 21 and the second pressure detection device 22 are more accurate. The flow area of ​​the electronic expansion valve 4 and the throttling index of the electronic expansion valve 4 can be obtained through the parameter lookup table provided by the manufacturer of the electronic expansion valve 4, and the acquisition method is more convenient.

[0125] The present application can obtain the refrigerant flow of the electronic expansion valve 4 without measuring a large number of parameters, thereby reducing the detection of a large number of parameters and making the error rate of deviation accumulation smaller, thereby making the detected refrigerant flow of the electronic expansion valve 4 more accurate.

[0126] In some embodiments, after confirming the diameter of the inner wall of the capillary to be replaced, the length of the capillary can be obtained only through the second logical operation. The selection of the length is easier and more flexible than the selection of the inner diameter of the capillary, which can improve the matching efficiency of the capillary in the air conditioner.

[0127] The second logic includes: performing a second logical operation based on the diameter of the inner wall of the capillary, the refrigerant flow rate through the electronic expansion valve 4, the difference between the first refrigerant pressure and the second refrigerant pressure, the friction coefficient of the refrigerant flow in the capillary, the refrigerant specific volume at the capillary inlet and the refrigerant specific volume at the capillary outlet to obtain the length of the capillary to be replaced.

[0128] In some embodiments, the second logic is: L = D * ΔP / [f * Q 2 *(v1-v2)], where L is the length of the capillary to be replaced, D is the diameter based on the inner wall of the capillary, ΔP is the difference between the first refrigerant pressure and the second refrigerant pressure, f is the friction coefficient of the refrigerant flow in the capillary, Q is the refrigerant flow rate through the electronic expansion valve 4, v1 is the refrigerant specific volume at the capillary inlet, and v2 is the refrigerant specific volume at the capillary outlet.

[0129] When the length of the capillary tube to be selected by the second logical operation, the friction coefficient of the refrigerant flow in the capillary tube, the refrigerant specific volume at the capillary tube inlet, and the refrigerant specific volume at the capillary tube outlet can be obtained by looking up the physical property table of the corresponding refrigerant. Therefore, it is only necessary to calculate the diameter of the capillary tube and the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the accurate length of the capillary tube to be selected.

[0130] In the second logical operation of the present application, the second logical operation requires fewer parameters to be detected, which reduces the detection of a large number of parameters and makes the error rate of accumulated deviations smaller, thereby making the value of the capillary length obtained by the operation more accurate.

[0131] Reference Fig.10 As shown, in some embodiments, the first pressure detection device 21 and the second pressure detection device 22 can be replaced by an external thermocouple 6. The thermocouple 6 is arranged between the outdoor heat exchanger 14 and the electronic expansion valve 4. The temperature between the outdoor heat exchanger 14 and the electronic expansion valve 4 is detected by the thermocouple 6, and the second refrigerant pressure therein is obtained by the conversion relationship between temperature and pressure, and then the length of the capillary to be selected is obtained by the first logical operation and the second logical operation.

[0132] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air conditioner, characterized in that: include: An outdoor heat exchanger, the outdoor heat exchanger serving as a condenser of an air conditioner; A flow divider, the flow divider comprises a flow divider head and a plurality of flow divider tubes, and the inlets of the plurality of flow divider tubes are connected to the flow divider head; An electronic expansion valve connected between the outdoor heat exchanger and at least a plurality of the shunt pipes, the electronic expansion valve and the shunt pipes being connected via a first refrigerant circuit, and the electronic expansion valve and the outdoor heat exchanger being connected via a second refrigerant circuit; a stop valve, which is disposed on at least a portion of the first refrigerant circuit and at least a portion of the second refrigerant circuit, and the stop valve is used to cut off the refrigerant flowing in the first refrigerant circuit or the second refrigerant circuit; A first pressure detection device, which is arranged on a refrigerant circuit connected to the flow splitter, and is used to detect the pressure of the first refrigerant flowing into the flow splitter; A second pressure detection device, which is arranged on the second refrigerant circuit and is used to detect the second refrigerant pressure on the corresponding second refrigerant circuit after flowing through the electronic expansion valve; The controller is configured to: when the refrigerant flows through the diverter, the electronic expansion valve and the outdoor heat exchanger in sequence, perform a first logical operation based on the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the refrigerant flow through the electronic expansion valve, and the difference between the first refrigerant pressure and the second refrigerant pressure is positively correlated with the corresponding refrigerant flow of the electronic expansion valve.

2. The air conditioner according to claim 1, characterized in that: The controller is configured to: after obtaining the refrigerant flow rate passing through the electronic expansion valve through the first logical operation, perform a second logical operation according to the refrigerant flow rate passing through the electronic expansion valve to obtain the length of the capillary tube.

3. The air conditioner according to claim 2, characterized in that: After performing a second logical operation on the refrigerant flow rate of the electronic expansion valve to obtain the length of the capillary, the stop valve is closed to cut off the refrigerant flowing in the first refrigerant circuit and the second refrigerant circuit, and the capillary of the corresponding length replaces the corresponding electronic expansion valve.

4. The air conditioner according to claim 1, characterized in that: The first logic includes: performing the first logic operation based on the flow area of ​​the electronic expansion valve corresponding to the second refrigerant pressure, the throttling index of the electronic expansion valve, and the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the refrigerant flow through the electronic expansion valve.

5. The air conditioner according to claim 4, characterized in that: The first logic is: Q=K*A*ΔPm, wherein Q is the refrigerant flow rate through the electronic expansion valve, K is a constant, A is the flow area of ​​the electronic expansion valve, ΔP is the difference between the first refrigerant pressure and the second refrigerant pressure, and m is the throttling index of the electronic expansion valve.

6. The air conditioner according to claim 2, characterized in that: Determine the diameter of the inner wall of the capillary to be replaced; The second logic includes: performing a second logical operation based on the diameter of the inner wall of the capillary, the refrigerant flow rate through the electronic expansion valve, the difference between the first refrigerant pressure and the second refrigerant pressure, the friction coefficient of the refrigerant flow in the capillary, the refrigerant specific volume at the capillary inlet and the refrigerant specific volume at the capillary outlet to obtain the length of the capillary to be replaced.

7. The air conditioner according to claim 6, characterized in that: The second logic is: L = D * ΔP / [f * Q 2 *(v1-v2)], wherein L is the length of the capillary to be replaced, D is the diameter based on the inner wall of the capillary, ΔP is the difference between the first refrigerant pressure and the second refrigerant pressure, f is the friction coefficient of the refrigerant flow in the capillary, Q is the refrigerant flow rate through the electronic expansion valve, v1 is the refrigerant specific volume at the capillary inlet, and v2 is the refrigerant specific volume at the capillary outlet.

8. The air conditioner according to claim 7, characterized in that: The difference between the first refrigerant pressure and the second refrigerant pressure is positively correlated with the length of the capillary tube to be replaced.

9. The air conditioner according to claim 7, characterized in that: The refrigerant flow rate passing through the corresponding electronic expansion valve is negatively correlated with the length of the capillary tube to be replaced.

10. An air conditioner, characterized in that: include: An indoor heat exchanger, the indoor heat exchanger serving as a condenser of an air conditioner; A flow divider, the flow divider comprises a flow divider head and a plurality of flow divider tubes, and the inlets of the plurality of flow divider tubes are all connected to the flow divider head; An electronic expansion valve connected between the indoor heat exchanger and at least a plurality of the shunt pipes, the electronic expansion valve and the shunt pipes being connected via a third refrigerant circuit, and the electronic expansion valve and the indoor heat exchanger being connected via a fourth refrigerant circuit; a stop valve, which is provided in at least a portion of the third refrigerant circuit and at least a portion of the fourth refrigerant circuit, the stop valve being used to cut off the refrigerant flowing in the third refrigerant circuit or the fourth refrigerant circuit; A first pressure detection device, which is arranged on a refrigerant circuit connected to the flow splitter, and is used to detect the pressure of the first refrigerant flowing out of the flow splitter; A second pressure detection device, which is arranged on the fourth refrigerant circuit and is used to detect the second refrigerant pressure on the corresponding fourth refrigerant circuit before flowing through the electronic expansion valve; The controller is configured to: when the refrigerant flows through the indoor heat exchanger, the electronic expansion valve and the diverter in sequence, perform a first logical operation based on the difference between the first refrigerant pressure and the second refrigerant pressure to obtain the refrigerant flow through the electronic expansion valve, and the difference between the first refrigerant pressure and the second refrigerant pressure is positively correlated with the corresponding refrigerant flow of the electronic expansion valve.

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