Air conditioner

Abstract

The invention provides an air conditioner and a control method thereof, the air conditioner can be used in a high-temperature environment, the air conditioner comprises a refrigerant loop, and in the refrigerant loop, a refrigerant circulates in a compressor, a condenser, a throttling device and an evaporator in sequence; the refrigerating system comprises a cooling pipe which is tightly connected with an exhaust pipe of the compressor; a proper amount of liquid water is stored in the liquid storage pipe; the capillary tube is communicated with the cooling tube and the liquid storage tube to form a loop and is positioned above the cooling tube and the electronic valve; the electronic valve is arranged in the liquid storage pipe to control on-off of a flow path between the liquid storage pipe and the cooling pipe; the capillary temperature sensor is used for detecting the temperature of the capillary; in the initial state, liquid water in the liquid storage pipe is located between the capillary tube and the electronic valve. According to the air conditioner, the independent refrigerating system is arranged on the exhaust pipe, the refrigerating system is operated under the high-temperature environment, the temperature of the exhaust pipe is reduced, and therefore the condensing pressure is reduced, and safe operation refrigeration of the air conditioner under the high-temperature environment can be achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to an air conditioner and a control method thereof. BACKGROUND

[0002] An air conditioner generally refers to a device for artificially adjusting and controlling the temperature, humidity, flow rate and other parameters of ambient air in a room to be adjusted. The air conditioner usually comprises a refrigerant circuit, in which the refrigerant is circulated through a compressor, a condenser, a throttling device and an evaporator in sequence to realize refrigeration and heating.

[0003] At present, the air conditioner often has the problem of excessive pressure of the air conditioning system when refrigerating at high temperature. In the related art, the pressure of the air conditioning system is reduced by unloading the refrigerant amount of the outdoor unit or unloading the displacement of the compressor. However, this method can cause unstable operation of the air conditioning system, poor reliability, low refrigeration efficiency, poor refrigeration effect, and affect user experience. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art. To this end,

[0005] According to an embodiment of the present disclosure, an air conditioner is provided, which can be used in a high-temperature environment, and comprises:

[0006] a refrigerant circuit, in which the refrigerant is circulated through a compressor, a condenser, a throttling device and an evaporator in sequence;

[0007] an exhaust pipe connected to an exhaust port of the compressor;

[0008] a refrigeration system comprising:

[0009] a cooling pipe closely connected to the exhaust pipe;

[0010] a liquid storage pipe, in which an appropriate amount of liquid water is stored, the liquid storage pipe being in communication with the cooling pipe;

[0011] a capillary tube, which is in communication with the cooling pipe and the liquid storage pipe to form a loop;

[0012] an electronic valve provided in the liquid storage pipe to control the opening and closing of the flow path between the liquid storage pipe and the cooling pipe;

[0013] a capillary tube temperature sensor provided at one end of the capillary tube close to the liquid storage pipe to detect the capillary tube temperature;

[0014] The capillary tube is located above the cooling pipe and the electronic valve, and in the initial state, the liquid water in the liquid storage pipe is located between the capillary tube and the electronic valve.

[0015] In a high-temperature environment, the electronic valve is opened and closed after a first preset time, liquid water at the liquid storage pipe flows to the cooling pipe, the liquid water at the cooling pipe exchanges heat with the exhaust pipe, the liquid water is evaporated into gaseous water by heat, and the gaseous water becomes liquid water again after throttling by the capillary pipe and then enters the liquid storage pipe.

[0016] The air conditioner provided by the technical solution can realize safe operation of the air conditioner in a high-temperature environment, improve the refrigeration efficiency and refrigeration effect of the air conditioner in the high-temperature environment, and reduce the condensing pressure by setting an independent refrigeration system on the exhaust pipe, reducing the temperature of the exhaust pipe, and reducing the exhaust temperature.

[0017] According to an embodiment of the present disclosure, the ratio between the outer diameter of the cooling pipe and the outer diameter of the exhaust pipe ranges from 0.9 to 1.1.

[0018] According to an embodiment of the present disclosure, the cooling pipe extends in the axial direction of the compressor, the cooling pipe is connected to the vertical pipe section of the exhaust pipe, the liquid storage pipe is arranged opposite to the cooling pipe, and the liquid storage pipe is located on the side of the cooling pipe away from the compressor.

[0019] In the technical solution, the cooling pipe is connected to the vertical pipe section of the exhaust pipe, which is suitable for the conventional shape of the exhaust pipe in the prior art and facilitates the setting of the refrigeration system.

[0020] According to an embodiment of the present disclosure, a control method of an air conditioner is also provided, which adopts the air conditioner of any one of the above technical solutions, and the control method comprises the following steps:

[0021] When a first preset condition is reached, the air conditioner enters a high-temperature refrigeration mode;

[0022] The high-temperature refrigeration mode comprises the following steps until the high-temperature refrigeration mode is exited:

[0023] The electronic valve is controlled to be opened, the liquid water flows to the cooling pipe through the electronic valve, and the electronic valve is controlled to be closed after a first predetermined time;

[0024] The liquid water at the cooling pipe exchanges heat with the exhaust pipe, the liquid water is evaporated into gaseous water by heat, and the gaseous water becomes liquid water again after throttling by the capillary pipe and then gathers on the electronic valve.

[0025] The control method of the air conditioner provided by the technical scheme can enter a high-temperature refrigeration mode in a high-temperature environment, in which mode, water in the refrigeration system circulates in a loop, and the exhaust pipe with a relatively high temperature can make liquid water evaporate into gaseous water, the liquid water can absorb heat from the exhaust pipe in the evaporation process, and part of the heat of the exhaust pipe can be taken away, so that the purpose of reducing the condensation temperature and the condensation pressure is achieved, and the problems of low refrigeration efficiency and poor refrigeration effect caused by the high-temperature environment are avoided.

[0026] According to an embodiment of the present disclosure, after the air conditioner exits the high-temperature refrigeration mode, the electronic valve is controlled to be in a closed state.

[0027] According to an embodiment of the present disclosure, after the air conditioner enters the high-temperature refrigeration mode, the outdoor coil temperature and the exhaust temperature are acquired in real time.

[0028] If the outdoor coil temperature is lower than a second preset threshold value or the exhaust temperature is lower than a third preset threshold value, it is determined to exit the high-temperature refrigeration mode.

[0029] In the technical scheme, after entering the high-temperature refrigeration mode, it is determined in real time whether the preset condition for exiting the high-temperature refrigeration mode is met, and the system reliability is improved.

[0030] According to an embodiment of the present disclosure, during the gaseous water throttling process, the exhaust temperature and the capillary tube temperature are acquired in real time, and if the difference between the exhaust temperature and the capillary tube temperature is lower than a preset difference value, it is determined that the gaseous water throttling is ended, and one cycle is completed.

[0031] According to an embodiment of the present disclosure, after the gaseous water throttling is ended in the high-temperature refrigeration mode, the electronic valve is controlled to be opened after a second predetermined time, and the next cycle is entered.

[0032] In the technical scheme, by setting the second predetermined time, it is ensured that the water after throttling and pressure reduction can flow to the electronic valve, and sufficient liquid water is ensured to participate in the next cycle.

[0033] According to an embodiment of the present disclosure, the air conditioner entering the high-temperature refrigeration mode comprises:

[0034] Acquiring an outdoor environment temperature, an exhaust temperature and an outdoor coil temperature;

[0035] If the outdoor environment temperature exceeds a first preset threshold value, the exhaust temperature exceeds a second preset threshold value, and the outdoor coil temperature exceeds a third preset threshold value, it is determined that the first preset condition is met, and the air conditioner enters the high-temperature refrigeration mode.

[0036] According to an embodiment of the present disclosure, in the high-temperature refrigeration mode, the exhaust temperature is acquired in real time.

[0037] If the exhaust temperature decreases to the compressor exhaust protection frequency increasing temperature, the compressor is controlled to increase the operating frequency; if the exhaust temperature reaches the compressor exhaust protection frequency decreasing temperature, the compressor is controlled to decrease the operating frequency.

[0038] The technical solution has the advantages that the compressor exhaust protection mode of the air conditioner itself can be parallel to the cooling protection logic of the refrigeration system, and the two do not affect each other, thereby improving the operation stability of the air conditioning system. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0040] Figure 1 is a structural block diagram of an air conditioner according to an embodiment of the present disclosure;

[0041] Figure 2 is a principle block diagram of an air conditioner according to an embodiment of the present disclosure;

[0042] Figure 3 is a structural schematic diagram of a refrigerant circuit according to an embodiment of the present disclosure;

[0043] Figure 4 is a structural schematic diagram of a refrigerant circuit with a four-way valve according to an embodiment of the present disclosure;

[0044] Figure 5 is a system block diagram of an air conditioner according to an embodiment of the present disclosure;

[0045] Figure 6 is a structural schematic diagram of a refrigeration system arranged on an exhaust pipe according to an embodiment of the present disclosure;

[0046] Figure 7 is a hardware configuration block diagram of an air conditioner according to an embodiment of the present disclosure;

[0047] Figure 8 is control logic of an air conditioner in a high-temperature environment according to an embodiment of the present disclosure;

[0048] Figure 9 is control logic for judging whether to enter a high-temperature refrigeration mode according to an embodiment of the present disclosure;

[0049] Figure 10 is a flowchart of a control method of an air conditioner according to an embodiment of the present disclosure.

[0050] In the above figures: air conditioner 100; outdoor unit 1; outdoor fan 11; indoor unit 2; indoor fan 21; controller 3; refrigerant circuit 4; compressor 41; condenser 42; throttling device 43; evaporator 44; four-way valve 45; discharge pipe 5; refrigeration system 6; cooling pipe 61; liquid storage pipe 62; electronic valve 63; capillary tube 64; capillary tube temperature sensor 65; liquid water 66; discharge temperature sensor 7; first temperature sensor 8; second temperature sensor 9. DETAILED DESCRIPTION

[0051] In order to make the purposes, technical solutions, and advantages of the present application clearer, the present application is described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0052] It is obvious that the accompanying drawings in the following description are only some examples or embodiments of the present application, and for those of ordinary skill in the art, the present application can be applied to other similar scenarios without creative effort based on the accompanying drawings. In addition, it can be understood that although the efforts made in the development process can be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacture, or production changes based on the technical content disclosed in the present application are only routine technical means and should not be understood as insufficient disclosure of the content disclosed in the present application.

[0053] In the present application, the phrase "embodiment" means that the specific features, structures, or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in the present application can be combined with other embodiments without conflict.

[0054] The terms "connected", "connected", "coupled" and the like in the present application are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The term "multiple" in the present application refers to two or more. The term "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the front and rear associated objects are in an "or" relationship. The terms "first", "second", "third" and the like in the present application are only to distinguish similar objects, and do not represent a specific order for the objects.

[0055] The present application provides an air conditioner 100, which will be described below with reference to Figures 1-10 The air conditioner 100 provided in the present application is described.

[0056] In one illustrative embodiment of the air conditioner 100 provided in the present application, with reference to Figure 1 The air conditioner 100 can include an indoor unit 2. The indoor unit 2 is usually arranged indoors for heat exchange with the indoor environment.

[0057] The indoor unit 2 can be arranged as a wall-mounted type, a stand type, a ceiling type, a duct type, a window curtain type, etc.

[0058] The air conditioner 100 can include an outdoor unit 1. The outdoor unit 1 is usually arranged outdoors for bringing the heat in the room to the outdoors.

[0059] Among them, the indoor unit 2 and the outdoor unit 1 can be arranged as an all-in-one machine or a split machine.

[0060] The indoor unit 2 can include an indoor unit shell. The indoor unit shell forms the appearance of the indoor unit.

[0061] An installation cavity is formed in the indoor unit shell. The installation cavity is used to accommodate and fix various components in the indoor unit 1.

[0062] The indoor unit shell can include an air inlet. The air inlet is in communication with the installation cavity, and the air inlet serves as an entrance for air flow from outside the indoor unit shell, allowing indoor air to enter the installation cavity through the air inlet.

[0063] The indoor unit shell can include an air outlet. The air outlet is in communication with the installation cavity, and the air outlet serves as an exit for air flow in the indoor unit shell, allowing air flow in the installation cavity to flow out through the air outlet.

[0064] The indoor unit 2 can include an indoor heat exchanger. The indoor heat exchanger is arranged in the installation cavity for heat exchange with the air flow in the indoor unit shell.

[0065] The indoor unit 2 can include an indoor fan 21. The indoor fan 21 is disposed in the installation cavity and is configured to drive air in the installation cavity to flow in a direction from the air inlet to the air outlet.

[0066] The outdoor unit 1 can include an outdoor unit shell.

[0067] The outdoor unit 1 can include an outdoor unit shell. The outdoor unit shell has an accommodation space inside, and the outdoor unit shell forms the appearance of the outdoor unit 1.

[0068] The outdoor unit shell can include an outdoor air inlet. The outdoor air inlet can be in communication with the accommodation space. The outdoor air inlet can be configured to introduce outdoor air into the accommodation space.

[0069] The outdoor unit shell can include an outdoor air outlet. The outdoor air outlet can be in communication with the accommodation space. The outdoor air outlet can be configured to introduce air in the accommodation space out of the accommodation space.

[0070] The outdoor unit 1 can include an outdoor heat exchanger. The outdoor heat exchanger can be disposed in the accommodation space.

[0071] The outdoor unit 1 can include an outdoor fan 11. The outdoor fan 11 can be disposed in the accommodation space. Rotation of the outdoor fan 11 causes outdoor air to enter the accommodation cavity from the outdoor air inlet, exchange heat with the outdoor heat exchanger, and then flow out of the accommodation cavity from the outdoor air outlet.

[0072] The air conditioner 100 can include a compressor 41.

[0073] The compressor 41 is disposed in the outdoor unit 1. The compressor 41 is configured to compress refrigerant gas in a low-temperature and low-pressure state into refrigerant gas in a high-temperature and high-pressure state, and discharge the compressed refrigerant gas to the condenser 42. The compressor can be a variable frequency compressor.

[0074] The air conditioner 100 can include a throttling device 43. The throttling device 43 is configured to throttle. The throttling device 43 can be disposed in the indoor unit 2 or the outdoor unit 1.

[0075] One of the evaporator 44 and the condenser 42 is an indoor heat exchanger, and the other is an outdoor heat exchanger.

[0076] The air conditioner 100 can include a four-way valve 45. The four-way valve 45 is disposed in the outdoor unit 1 and is configured to change the flow direction of the refrigerant in the refrigerant circuit 4.

[0077] In some embodiments of the present application, the air conditioner 100 can include a controller 3. The controller 3 is electrically connected to the indoor unit 2 and the outdoor unit 1 to control the operation of the components inside to enable the components of the air conditioner 100 to operate to achieve the predetermined functions of the air conditioner 100.

[0078] Reference Figure 2The controller 3 is electrically connected to at least the compressor 41, the throttling device 43, the indoor fan 21 and the outdoor fan 11.

[0079] In the embodiments shown in the present application, the controller 3 refers to a device that can generate operation control signals according to instruction operation codes and timing signals, and instruct the air conditioner to execute control instructions. For example, in response to the received power-on or power-off instruction issued by the user, the controller 3 can execute the operation related to the object selected by the power-on or power-off instruction.

[0080] The air conditioner 100 can include a refrigerant circuit 4. Referring to the structural schematic diagram of the refrigerant circuit 4 shown in Figure 3 , Figure 4 , the refrigerant circuit 4 is connected to the indoor unit 2 and the outdoor unit 1 by using a connection pipe to form a refrigerant circuit 4 for circulating refrigerant.

[0081] The air conditioner 100 can execute indoor cooling or heating by making the refrigerant circulate through the compressor 41, the condenser 42, the throttling device 43 and the evaporator 44 in sequence through the refrigerant circuit 4.

[0082] Referring to Figure 5 , the air conditioner 100 can include an exhaust pipe 5. The exhaust pipe 5 is connected to the exhaust port of the compressor to make the high-temperature and high-pressure refrigerant gas in the compressor discharge through the exhaust pipe 5.

[0083] The exhaust pipe 5 is located on the pipeline between the compressor 41 and the condenser 42. The exhaust pipe 5 is connected between the exhaust port of the compressor 41 and the four-way valve 45. The high-temperature and high-pressure refrigerant gas flowing out of the exhaust port of the compressor 41 flows into the condenser 42 through the exhaust pipe 5 and the four-way valve 45.

[0084] The air conditioner 100 can include a suction pipe. The suction pipe is connected to the suction port of the compressor 41 to make the low-temperature and low-pressure refrigerant enter the inside of the compressor 41 through the suction pipe.

[0085] The suction pipe is located on the pipeline between the compressor 41 and the evaporator 42. The suction pipe is connected between the suction port of the compressor and the four-way valve 45. The low-temperature and low-pressure refrigerant flowing out of the evaporator 44 can flow back to the compressor 41 through the four-way valve and the suction pipe.

[0086] In some embodiments of the present application, with continued reference to Figure 5 , the air conditioner 100 can include a refrigeration system 6.

[0087] The refrigeration system 6 is arranged on the exhaust pipe 5. In a high-temperature environment, the refrigeration system 6 performs a refrigeration cycle to reduce the exhaust temperature, thereby reducing the condensing pressure, so that the air conditioner 100 can safely operate and refrigerate in a high-temperature environment.

[0088] Referring toFigure 6 The refrigeration system 6 can comprise a cooling pipe 61. The cooling pipe 61 is tightly connected with the exhaust pipe 5. In particular, the cooling pipe 61 is welded on the outside of the exhaust pipe 5.

[0089] The refrigeration system 6 can comprise a liquid storage pipe 62. The liquid storage pipe 62 stores a proper amount of liquid water 66. The liquid storage pipe 62 is in communication with the cooling pipe 61, and the liquid water 66 in the liquid storage pipe 62 can flow into the cooling pipe 61.

[0090] The refrigeration system 6 can comprise an electronic valve 63. The electronic valve 63 is arranged in the liquid storage pipe 62, and controls the opening and closing of the flow path between the liquid storage pipe 62 and the cooling pipe 61.

[0091] In the initial state, the liquid water 66 in the liquid storage pipe 62 is located between the capillary tube 64 and the electronic valve 63.

[0092] The refrigeration system 6 can comprise a capillary tube 64. The capillary tube 64 is in communication with the cooling pipe 61 and the liquid storage pipe 62 to form a loop.

[0093] The refrigeration system 6 can comprise a capillary tube temperature sensor 65. The capillary tube temperature sensor 65 is arranged at the end of the capillary tube 64 close to the liquid storage pipe 62, and is used to detect the temperature of the capillary tube 64.

[0094] It can be understood that the capillary tube temperature sensor 65 is in communication connection with the controller, so that the detected temperature of the capillary tube 64 is sent to the controller.

[0095] In a high-temperature environment, the temperature of the exhaust pipe 5 is high. At this time, the electronic valve 63 is opened and closed after a first preset time, and during this process, the liquid water 66 in the liquid storage pipe 62 flows into the cooling pipe 61. The liquid water 66 in the cooling pipe 61 exchanges heat with the exhaust pipe 5, so that the liquid water 66 is heated and evaporated into gaseous water. The gaseous water enters the liquid storage pipe 62 again after throttling through the capillary tube 64.

[0096] Specifically, in a high-temperature environment, the temperature of the exhaust pipe 5 is above T1 ℃ (T1 must be > 100 ℃), and the liquid water will evaporate into gaseous water very quickly. The liquid water absorbs heat during the evaporation process, and carries away part of the heat of the exhaust pipe 5 to cool the exhaust pipe 5. At this time, the electronic valve 63 is in a closed state, and the volume of gaseous water is much larger than that of liquid water. The gaseous water is forced to go up. Since the capillary tube 64 is located above the cooling pipe 61, the gaseous water will enter the capillary tube for throttling. After throttling, the pressure and temperature of the gaseous water decrease, and the gaseous water becomes liquid water again, which gathers on the electronic valve 63 again, completing a cycle. After the throttling of the gaseous water is completed, the electronic valve 63 is opened again, and the liquid water 66 flows out of the cooling pipe 61 again, evaporates again to cool the exhaust pipe 5, and forms a cycle.

[0097] In this embodiment, by using a separate refrigeration system 6, the exhaust pipe 5 is cooled in a high-temperature environment by performing a refrigeration cycle to reduce the exhaust temperature, thereby reducing the condensing pressure, improving the refrigeration efficiency and refrigeration effect, and improving the operation stability and reliability of the air conditioning system, which can realize safe operation of the refrigeration in a high-temperature environment.

[0098] In some embodiments of the present application, the cooling pipe 61 is welded to the outer wall of the exhaust pipe 5.

[0099] In some embodiments of the present application, the ratio between the outer diameter of the cooling pipe 61 and the outer diameter of the exhaust pipe 5 is in the range of 0.9-1.1. This setting allows the cooling pipe 61 to be stably welded to the exhaust pipe 5, and at the same time, the exhaust pipe 5 can be fully heat exchanged.

[0100] In this embodiment, the outer diameter of the cooling pipe 61 and the outer diameter of the exhaust pipe 5 can be 8 mm, and the error can be ±0.2 mm.

[0101] In this embodiment, the cooling pipe 61 can be a copper pipe. The thickness of the pipe wall of the cooling pipe 61 can be 0.75 mm, which is set to ensure the welding strength while fully heat exchanging with the cooling pipe 61 and taking away part of the heat of the exhaust pipe 5.

[0102] In some embodiments of the present application, with reference to Figure 6 , the cooling pipe 61 extends in the axial direction of the compressor, the cooling pipe 61 is connected to the vertical pipe section of the exhaust pipe 5, the liquid storage pipe 62 is arranged opposite to the cooling pipe 61, and the liquid storage pipe 62 is located on the side of the cooling pipe 61 away from the compressor.

[0103] The liquid storage pipe 62 and the cooling pipe 61 are connected by a connecting pipe, and the two ends of the connecting pipe are connected to the bottom end of the liquid storage pipe 62 and the bottom end of the cooling pipe 61, respectively.

[0104] Among them, one end of the connecting pipe is connected to the liquid storage pipe 62, and the other end is connected to the cooling pipe 61 from top to bottom, which facilitates the downward flow of the liquid water 66 in the liquid storage pipe 62 to the cooling pipe 61.

[0105] Figure 7 The hardware configuration block diagram of the air conditioner 100 according to the exemplary embodiments of the present application is shown. With reference to Figure 3 , the air conditioner 100 further comprises one or more of the following: an exhaust temperature sensor 7, a first temperature sensor 8, and a second temperature sensor 9. In addition, the indoor unit, the outdoor unit, the compressor 4, the exhaust temperature sensor 7, the first temperature sensor 8, and the second temperature sensor 9 are all in communication connection with the controller 8.

[0106] In some embodiments of the present application, the exhaust temperature sensor 7 is provided at the exhaust port of the compressor to detect the exhaust temperature and send the detected exhaust temperature to the controller.

[0107] In some embodiments of the present application, the first temperature sensor 8 is provided in an outdoor unit for detecting the outdoor ambient temperature and sending the detected outdoor ambient temperature to the controller.

[0108] In some embodiments of the present application, the second temperature sensor 9 is provided on a coil of an outdoor heat exchanger, and is used to detect the temperature of the external coil and send the detected temperature of the external coil to the controller.

[0109] Those skilled in the art will understand that Figure 7 The hardware structure shown in the figure does not constitute a limitation on the air conditioner 100. The air conditioner 100 may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0110] Figure 8 The control method of the air conditioner 100 provided in the embodiment of the present application can be applied to Figure 6 In the air conditioner 100 shown in FIG. Figure 8 As shown, the control method of the air conditioner 100 provided in the embodiment of the present application includes: in a high temperature environment, the air conditioner 100 enters a high temperature cooling mode.

[0111] by Figure 6 、 Figure 7 Taking the air conditioner 100 provided in the embodiment as an example, in a high temperature environment, when a first preset condition is met, the air conditioner 100 enters the high temperature cooling mode. The triggering conditions for the air conditioner 100 to enter the high temperature cooling mode may be: 1) the air conditioner 100 receives a command to enter the high temperature cooling mode.

[0112] Specifically, the high temperature cooling mode includes the following steps:

[0113] Electronic valve operation: the electronic valve 63 is controlled to be opened, and the liquid water 66 flows into the cooling pipe 61 through the electronic valve 63. After the first predetermined time has passed, the electronic valve 63 is controlled to be closed;

[0114] Exhaust pipe cooling protection: The liquid water 66 at the cooling pipe 61 exchanges heat with the exhaust pipe 5. The liquid water 66 evaporates into gaseous water due to the heat. The gaseous water is throttled through the capillary 64 and becomes liquid water and gathers on the electronic valve 63 again.

[0115] In the high-temperature refrigeration mode, the air conditioner 100 includes the following steps: operating the circulation electronic valve 63, cooling the exhaust pipe 5, and protecting the exhaust pipe 5 until the air conditioner 100 exits the high-temperature refrigeration mode. The trigger condition for the air conditioner 100 to exit the high-temperature refrigeration mode can be that the air conditioner 100 receives an instruction to exit the high-temperature refrigeration mode.

[0116] After the electronic valve 63 is opened, the electronic valve 63 is closed after a first predetermined time, that is, the electronic valve 63 is closed after waiting for a first predetermined time. In this embodiment, the first predetermined time T1 is waited for to ensure that the liquid water 66 on the electronic valve 63 flows to the lower side close to the cooling pipe 61.

[0117] Further, the air conditioner 100 entering the high-temperature refrigeration mode includes the following steps:

[0118] Obtaining the outdoor environment temperature, the exhaust temperature, and the outdoor coil temperature;

[0119] If the outdoor environment temperature exceeds a first preset threshold, the exhaust temperature exceeds a second preset threshold, and the outdoor coil temperature exceeds a third preset threshold, it is determined that the first preset condition is met, and the air conditioner enters the high-temperature refrigeration mode.

[0120] Specifically, referring to Figure 9 In an example embodiment provided by the present application, determining whether to enter the high-temperature refrigeration mode includes the following steps:

[0121] Step S10: Obtaining the outdoor environment temperature, the exhaust temperature, and the outdoor coil temperature;

[0122] Step S20: Determining whether the outdoor environment temperature exceeds a first preset threshold T0. If yes, step S300 is performed.

[0123] Step S30: Determining whether the exhaust temperature exceeds a second preset threshold T1. If yes, step S400 is performed.

[0124] Step S40: Determining whether the outdoor coil temperature exceeds a third preset threshold T2. If yes, it is determined that the air conditioner is currently in a high-temperature environment, the first preset condition is met, and the high-temperature refrigeration mode is entered. Step S40: Entering the high-temperature refrigeration mode is performed.

[0125] It can be understood that the order of determining the above-mentioned temperature conditions can not be in sequence, as long as the outdoor environment temperature, the exhaust temperature, and the outdoor coil temperature all meet the corresponding preset threshold.

[0126] In some embodiments of the present application, if the exhaust temperature sensor 7 and the second temperature sensor 9 are both not faulty, the high-temperature refrigeration mode includes the following steps: circulating the above-mentioned steps at least once.

[0127] In some embodiments of the present application, during the throttling of gaseous water, the exhaust temperature and the temperature of the capillary tube 64 are obtained in real time. If the difference between the exhaust temperature and the temperature of the capillary tube 64 is lower than a preset difference, it is determined that the throttling of gaseous water is completed, and one cycle is finished.

[0128] wherein T 排气 is the exhaust temperature, T is the temperature of the capillary tube 64, T 排气 T is the difference between the exhaust temperature and the temperature of the capillary tube 64, and δT is the preset difference.

[0129] In the present embodiment, (T 排气 T)≤δT means that the throttling of gaseous water is performed by volume expansion to increase the pressure of gaseous water to make gaseous water enter the capillary tube 64. In this process, the gaseous water before the capillary tube 64 is gradually reduced, and the pressure is gradually reduced. When the pressure is reduced to a certain extent, there is no enough pressure to make water vapor enter the capillary tube 64 for throttling. Therefore, at this time, it is determined that the cycle is completed, and the temperature of the capillary tube 64 for throttling is increased. Therefore, the temperature difference between the exhaust temperature and the temperature of the capillary tube 64 can be used as the basis for determining that one cycle is completed. In the specific design, a suitable parameter is selected for δT.

[0130] In some embodiments of the present application, after the throttling of gaseous water is completed in the high-temperature refrigeration mode, the electronic valve 63 is controlled to be opened after a second predetermined time, and the next cycle is entered.

[0131] The liquid water just after the throttling is suddenly discharged to the pipe wall of the liquid storage pipe 62. In order to ensure that the liquid water 66 on the pipe wall can completely flow to the electronic valve 63, in the present embodiment, the electronic valve 63 is controlled to be opened after a second predetermined time after the throttling of gaseous water is completed. That is, after the throttling of gaseous water is completed, the next cycle is entered after waiting for a second predetermined time T2.

[0132] Specifically, in the present embodiment, the air conditioner 100 is normally operated. After the first preset condition for operating the high-temperature refrigeration mode is met, the electronic valve 63 receives the control instruction for operating the high-temperature refrigeration mode sent by the controller, and the electronic valve 63 is controlled to be opened by the controller. The liquid water 66 in the liquid storage pipe 62 flows downward through the electronic valve 63, and the electronic valve 63 is closed after t1 time when the liquid water is completely flowed. The temperature of the capillary tube 64 is detected. When (T 排气 T)≤δT, it is assumed that the throttling of water vapor is completed. At this time, the water vapor pressure at the front end of the capillary tube 64 is low, and it is insufficient to make the water vapor at the front end of the capillary tube 64 pass through the capillary tube 64. At this time, one cycle is completed. After t2 time, the electronic valve 63 is opened, and the next cycle is started.

[0133] In some embodiments of the present application, the exiting of the high-temperature refrigeration mode includes: if the outer coil temperature is lower than a second preset threshold or the exhaust temperature is lower than a third preset threshold, it is determined to exit the high-temperature refrigeration mode.

[0134] In some embodiments of the present application, after the air conditioner 100 enters the high-temperature refrigeration mode, the outer coil temperature and the exhaust temperature are obtained in real time, and if the preset condition for exiting the high-temperature refrigeration mode is met, i.e., the outer coil temperature is lower than the second preset threshold or the exhaust temperature is lower than the third preset threshold, the high-temperature refrigeration mode is exited immediately.

[0135] In the present embodiment, after entering the high-temperature refrigeration mode, the exhaust temperature and the outer coil temperature are detected in real time to determine whether the preset condition for exiting the high-temperature refrigeration mode is met, and if the preset condition is met, the high-temperature refrigeration mode is exited regardless of which stage in the high-temperature refrigeration mode.

[0136] Of course, in some other embodiments, in the high-temperature refrigeration mode, it can be determined whether to exit the high-temperature refrigeration mode after each cycle is completed, and if yes, the cycle is ended and the high-temperature refrigeration mode is exited; otherwise, the next cycle is entered until the high-temperature refrigeration mode is exited.

[0137] In some embodiments of the present application, after the air conditioner 100 exits the high-temperature refrigeration mode, the electronic valve 63 is controlled to be in a closed state.

[0138] Specifically, after the condition for exiting the high-temperature operation mode is met, the electronic valve 63 receives the control instruction for exiting the high-temperature refrigeration mode sent by the controller, the electronic valve 63 is closed and kept in a closed state, and the cycle is ended.

[0139] In some embodiments of the present application, the control method of the air conditioner 100 further includes:

[0140] In the high-temperature refrigeration mode, the exhaust temperature is obtained in real time;

[0141] If the exhaust temperature decreases to the exhaust protection frequency-increasing temperature of the compressor, the operating frequency of the compressor is increased, and if the exhaust temperature reaches the exhaust protection frequency-decreasing temperature of the compressor, the operating frequency of the compressor is decreased.

[0142] In the present embodiment, after the air conditioner 100 enters the high-temperature refrigeration mode, the valve starts to operate according to the preset logic, and when the exhaust temperature decreases to the exhaust protection frequency-increasing temperature of the variable frequency compressor, the operating frequency of the compressor is increased, the refrigerating capacity of the compressor is increased, and the refrigeration effect is improved.

[0143] When the exhaust temperature is in the period of throttling of water vapor, the exhaust pipe 5 can not be effectively cooled, at this time the compressor exhaust protection mode of the air conditioner 100 itself is implemented. That is, the exhaust temperature reaches the compressor exhaust protection frequency reduction temperature, and then the frequency reduction is started, that is, the compressor exhaust protection mode of the air conditioner 100 itself can be parallel to the cooling protection logic of the refrigeration system 6, and does not affect each other.

[0144] When the outdoor environment temperature > T0, the exhaust temperature > T1, and the outer coil temperature > T2, it indicates that the outdoor unit is in a high temperature environment. In this embodiment, T0 can be greater than 45℃, T1 can be greater than 100℃, and T2 can be greater than 50℃, and the high temperature environment is an extreme high temperature environment, that is, the air conditioner provided in this embodiment can be applied to an extreme high temperature environment.

[0145] Of course, in other embodiments, T0, T1 and T2 can be set according to actual needs.

[0146] Figure 10 The flow chart of the control method of the air conditioner 100 in an embodiment of the application is shown in FIG. 1. In order to further understand the technical scheme of this embodiment, reference is made to FIG. 1. Figure 10 The control method of the air conditioner 100 in this embodiment is specifically described.

[0147] During the normal operation of the air conditioner 100, it is determined whether to enter the high temperature refrigeration mode:

[0148] The outdoor environment temperature, the exhaust temperature and the outer coil temperature are detected in real time, and it is determined whether the outdoor environment temperature > T0 (step S10);

[0149] In step S10, if the outdoor environment temperature > T0, step S20 is performed to determine whether the exhaust temperature > T1;

[0150] In step S20, if the exhaust temperature > T1, step S30 is performed to determine whether the outer coil temperature > T2;

[0151] In step S30, if the outer coil temperature > T2, the high temperature refrigeration mode is entered (step S40).

[0152] After entering the high temperature refrigeration mode, the exhaust temperature and the outer coil temperature are detected in real time, and it is determined whether the exhaust temperature ≤ T1 or the outer coil temperature ≤ T2 (step S50);

[0153] In step S50, if yes, that is, the exhaust temperature ≤ T1 or the outer coil temperature ≤ T2, the high temperature refrigeration mode is exited (step S60); if no, the current control logic is continued to be run.

[0154] After entering the high-temperature refrigeration mode, step S51 is executed, the electronic valve 63 is opened, and the time t is recorded. It is determined whether t is greater than t1 (step S52);

[0155] In step S52, if yes, i.e., t is greater than t1, step S53 is executed, the electronic valve 63 is closed; if no, the electronic valve 63 is kept in the open state.

[0156] After step S53 is executed, step S54 is executed, it is determined whether (T 排气 -T) is ≤ δT.

[0157] In step S54, if yes, i.e., (T 排气 -T) ≤ δT, the time t is recorded, it is determined whether t is greater than t2 (step S55), if no, the electronic valve 63 is in the closed state.

[0158] In step S55, if yes, i.e., t > t2, the next cycle is entered, and step S51 is repeatedly executed; if no, the electronic valve 63 is in the closed state.

[0159] The control method of the air conditioner 100 provided by the embodiment can realize the control of the air conditioner 100 in a high-temperature environment. The refrigeration system 6 on the exhaust pipe 5 is used to reduce the condensing pressure by reducing the condensing temperature to realize the safe refrigeration operation of the air conditioner 100 in a high-temperature environment.

[0160] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0161] The above description has been made in combination with specific embodiments for the convenience of explanation. However, the above exemplary discussion is not intended to exhaust or limit the embodiments to the specific forms disclosed above. Various modifications and variations can be derived according to the above teachings. The selection and description of the above embodiments are for better explanation of the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. An air conditioner for use in high temperature environments, characterized by, The application relates to an air conditioner and a control method thereof. The air conditioner comprises a refrigerant circuit, a discharge pipe, a cooling pipe, a liquid storage pipe, a capillary tube, an electronic valve and a capillary tube temperature sensor. The refrigerant circuit circulates refrigerant in a compressor, a condenser, a throttling device and an evaporator in sequence. The discharge pipe is connected to a discharge port of the compressor. The cooling pipe is closely connected to the discharge pipe. The liquid storage pipe is connected to the cooling pipe and stores a proper amount of liquid water. The capillary tube is connected to the cooling pipe and the liquid storage pipe to form a loop. The electronic valve is arranged in the liquid storage pipe and controls the opening and closing of a flow path between the liquid storage pipe and the cooling pipe. The capillary tube temperature sensor is arranged at one end of the capillary tube close to the liquid storage pipe to detect the capillary tube temperature. The capillary tube is located above the electronic valve. In an initial state, the liquid water in the liquid storage pipe is located between the capillary tube and the electronic valve.

2. The air conditioner of claim 1, wherein In a high-temperature environment, the electronic valve is opened and then closed after a first preset time, the liquid water in the liquid storage pipe flows to the cooling pipe, the liquid water in the cooling pipe exchanges heat with the discharge pipe, the liquid water is evaporated into gaseous water, and the gaseous water is throttled into liquid water by the capillary tube and then enters the liquid storage pipe again.

3. The air conditioner according to claim 1 or 2, characterized by The ratio between the outer diameter of the cooling pipe and the outer diameter of the discharge pipe ranges from 0.9 to 1.

1.

4. A control method of an air conditioner, characterized by, The cooling pipe extends along the axial direction of the compressor, the cooling pipe is connected to a vertical pipe section of the discharge pipe, the liquid storage pipe is arranged opposite to the cooling pipe, and the liquid storage pipe is located on the side of the cooling pipe away from the compressor. The control method comprises the following steps: When a first preset condition is reached, the air conditioner enters a high-temperature refrigeration mode. The high-temperature refrigeration mode comprises the following steps in a cycle until the high-temperature refrigeration mode is exited: The electronic valve is controlled to be opened, the liquid water flows to the cooling pipe through the electronic valve, and the electronic valve is controlled to be closed after a first preset time.

5. The control method of the air conditioner according to claim 4, characterized by, The liquid water in the cooling pipe exchanges heat with the discharge pipe, the liquid water is evaporated into gaseous water, and the gaseous water is throttled into liquid water by the capillary tube and then gathered on the electronic valve again.

6. The control method of an air conditioner according to claim 4 or 5, characterized by, After the air conditioner exits the high-temperature refrigeration mode, the electronic valve is controlled to be in a closed state. After the air conditioner enters the high-temperature refrigeration mode, the outdoor coil temperature and the discharge temperature are acquired in real time.

7. The control method of the air conditioner according to claim 4, wherein If the outdoor coil temperature is lower than a second preset threshold value or the discharge temperature is lower than a third preset threshold value, it is determined that the high-temperature refrigeration mode is exited.

8. The control method of an air conditioner according to claim 4 or 7, characterized by, In the throttling process of the gaseous water, the discharge temperature and the capillary tube temperature are acquired in real time, and if the difference between the discharge temperature and the capillary tube temperature is lower than a preset difference value, it is determined that the throttling of the gaseous water is completed and one cycle is finished.

9. The control method of the air conditioner according to claim 4, characterized by, After the throttling of the gaseous water is completed in the high-temperature refrigeration mode, the electronic valve is controlled to be opened after a second preset time, and the next cycle is entered. The air conditioner entering the high-temperature refrigeration mode comprises the following steps: The outdoor environment temperature, the discharge temperature and the outdoor coil temperature are acquired. If the outdoor environment temperature exceeds a first preset threshold, the exhaust temperature exceeds a second preset threshold, and the outdoor coil temperature exceeds a third preset threshold, it is determined that the first preset condition is reached, and the air conditioner enters the high-temperature refrigeration mode.

10. The control method of the air conditioner according to claim 4, characterized by, In the high-temperature refrigeration mode, the exhaust temperature is acquired in real time; If the exhaust temperature decreases to the exhaust protection frequency-increasing temperature of the compressor, the operation frequency of the compressor is increased; if the exhaust temperature reaches the exhaust protection frequency-decreasing temperature of the compressor, the operation frequency of the compressor is decreased. ​ ​

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