Air conditioning device

Abstract

The invention discloses an air conditioning device which comprises an evaporation temperature detection module, and low pressure of the air conditioning device is determined: an evaporation temperature signal is detected; determining the evaporation temperature according to the evaporation temperature signal; acquiring the pip number and the piping length of the air conditioning device, and obtaining a pressure correction coefficient corresponding to the air conditioning device from a predetermined pressure correction coefficient relationship corresponding to the pip number and the piping length of the air conditioning device; and determining the low pressure of the air conditioning device according to the evaporation temperature and the pressure correction coefficient. According to the air conditioning device, a pressure correction relation coefficient is determined in advance according to the matching number and the piping length of the air conditioning device and the relation between the low pressure and the evaporation temperature, and when the air conditioning device runs, the pressure correction relation coefficient is firstly determined according to the matching number and the piping length of the air conditioning device; and the low pressure is determined according to the evaporation temperature and the pressure correction relation coefficient, so that the determined low pressure can be matched with the refrigerating capacity and actual installation of the air conditioning device, and the determined low pressure is more accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning device, and particularly relates to an air conditioning device capable of accurately determining low-pressure. BACKGROUND

[0002] At present, there are various forms of air conditioning devices. In some air conditioning devices (for example, unit machines), a low-pressure detection module is not arranged, however, the control of the air conditioning device needs the participation of low-pressure, thus, in the air conditioning device, the low-pressure is generally determined through the evaporation temperature.

[0003] However, due to the diversity of the refrigeration capacity of the air conditioning device and the different actual installation scenes, the low-pressure determined through the evaporation temperature is not accurate, thereby adversely affecting the control of the air conditioning device.

[0004] The above information disclosed in the background of the application is only used to increase the understanding of the background of the application, and thus, it can include the prior art known by those skilled in the art. SUMMARY

[0005] The present application provides an air conditioning device, which solves the technical problem that the low-pressure determined through the evaporation temperature in the existing air conditioning device is not accurate due to the different refrigeration capacities and installation scenes of the air conditioning device.

[0006] To achieve the above-mentioned application purposes, the present application adopts the following technical solutions: An air conditioning device, the air conditioning device comprises an evaporation temperature detection module, and the low-pressure of the air conditioning device is determined as follows: detecting an evaporation temperature signal; determining an evaporation temperature according to the evaporation temperature signal; obtaining the number of matches and the length of the pipe of the air conditioning device, and obtaining the pressure correction coefficient corresponding to the air conditioning device from the pressure correction coefficient relationship corresponding to the number of matches and the length of the pipe of the air conditioning device determined in advance; determining the low-pressure of the air conditioning device according to the evaporation temperature and the pressure correction coefficient.

[0007] In some examples of the present application, the evaporation temperature is obtained through the evaporation temperature signal, the running frequency of the compressor and the temperature correction coefficient; During refrigeration, the evaporation temperature signal is the lowest temperature of the indoor heat exchanger; During heating, the evaporation temperature signal is the liquid pipe temperature of the outdoor heat exchanger or the lowest temperature of the outdoor heat exchanger; and the temperature correction coefficient is determined through the outdoor environment temperature interval and the number of matches.

[0008] In some examples of this application, during the set time of the air conditioner's start-up, the evaporation temperature signal is the liquid pipe temperature of the outdoor heat exchanger; after the set time of the air conditioner's start-up, the evaporation temperature signal is the lowest temperature of the outdoor heat exchanger.

[0009] In some examples of this application, the evaporation temperature = evaporation temperature signal + first temperature correction coefficient + compressor operating frequency * second temperature correction coefficient + third temperature correction coefficient * constant.

[0010] In some examples of this application, the constant is α when the air conditioning device is in a self-cleaning state, and β when it is in other states.

[0011] In some examples of this application, compressor information is obtained. When the compressor is a single-phase motor, the low-pressure is determined based on a first pressure correction coefficient and the evaporation temperature. When the compressor is a three-phase motor, the low-pressure is determined based on a first pressure correction coefficient, the evaporation temperature, and a second pressure correction coefficient.

[0012] In some examples of this application, when the compressor is a single-phase motor, the low-pressure pressure = first pressure correction coefficient * evaporation temperature; When the compressor is a three-phase motor, the low pressure is equal to the first pressure correction factor * evaporation temperature + the second pressure correction factor.

[0013] In some examples of this application, the corresponding low-pressure value is determined based on the evaporation temperature; Obtain the overall current value; The low-pressure value is determined based on the corresponding low-pressure value, the current value, the compressor operating frequency, and the pressure correction coefficient.

[0014] In some examples of this application, when the compressor is a single-phase motor, the low-pressure pressure = third pressure correction coefficient * corresponding low-pressure pressure value + fourth pressure correction coefficient * current value / compressor operating frequency; When the compressor is a three-phase motor, the low pressure = third pressure correction coefficient * corresponding low pressure value + fourth pressure correction coefficient * fifth pressure correction coefficient * current value / compressor operating frequency.

[0015] In some examples of this application, the compressor operating frequency is obtained; When the compressor operating frequency does not exceed the set frequency, the low pressure is determined based on the evaporation temperature and the pressure correction coefficient; When the compressor operating frequency exceeds the set frequency, the corresponding low-pressure value is determined based on the evaporation temperature; the overall current value is obtained; the low-pressure value is determined based on the corresponding low-pressure value, the current value, the compressor operating frequency, and the pressure correction coefficient.

[0016] Compared with existing technologies, the advantages and positive effects of this invention are as follows: An air conditioning device includes an evaporation temperature detection module. The method for determining the low-pressure of the air conditioning device is as follows: detecting the evaporation temperature signal; determining the evaporation temperature based on the evaporation temperature signal; obtaining the horsepower and piping length of the air conditioning device; obtaining the corresponding pressure correction coefficient of the air conditioning device from a pre-determined pressure correction coefficient relationship between the horsepower and piping length of the air conditioning device; and determining the low-pressure of the air conditioning device based on the evaporation temperature and the pressure correction coefficient. In this invention, the air conditioning device pre-determines the pressure correction coefficient based on the horsepower and piping length of the air conditioning device and the relationship between the low-pressure and evaporation temperature. During operation, the pressure correction coefficient is first determined based on the horsepower and piping length of the air conditioning device, and then the low-pressure is determined based on the evaporation temperature and the pressure correction coefficient. Therefore, the low-pressure determined by this invention can be adapted to the cooling capacity of the air conditioning device and the actual installation, and the determined low-pressure is more accurate.

[0017] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of the low-pressure determination method for an air conditioning unit according to an embodiment; Figure 2 This is a flowchart of the evaporation temperature determination method according to an embodiment; Figure 3 This is a flowchart of another method for determining the evaporation temperature according to an embodiment; Figure 4 Here is a flowchart of a method for further determining the evaporation temperature according to an embodiment; Figure 5 This is a flowchart of another method for determining the evaporation temperature according to the embodiment; Figure 6 This is a flowchart of a method for determining the low-voltage pressure of a single-phase motor according to an embodiment; Figure 7 This is a flowchart of a method for determining the low-voltage pressure of a three-phase motor according to an embodiment; Figure 8 This is a flowchart of a method for determining the low-voltage pressure of a single-phase motor according to an embodiment; Figure 9This is a flowchart of a method for determining the low-voltage pressure of a three-phase motor according to an embodiment; Figure 10 This is a flowchart of a method for determining low-pressure based on the overall machine current, according to an embodiment. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0026] The air conditioning unit disclosed in this application performs a refrigeration cycle by using a compressor, a condenser, a throttling device, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0027] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0028] The throttling device expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the throttling device, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioning unit regulates the temperature of the indoor space.

[0029] The outdoor unit of an air conditioning unit refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioning unit includes the indoor heat exchanger, and a throttling device can be provided in the indoor unit and / or the outdoor unit.

[0030] Indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger functions as a condenser, the air conditioning unit acts as a heater in heating mode; when the indoor heat exchanger functions as an evaporator, the air conditioning unit acts as a cooler in cooling mode.

[0031] Air conditioning units typically require low-pressure data. The main function of this low-pressure data is to detect whether the system pressure is normal and to activate protection mechanisms when the pressure exceeds the allowable range. In air conditioning units with a low-pressure detection module, the low-pressure is directly detected through the low-pressure detection module. In some air conditioning units without a low-pressure detection module, the low-pressure cannot be directly detected. However, air conditioning units are generally equipped with an evaporation temperature detection module. There is a certain relationship between evaporation temperature and evaporation pressure. Therefore, the evaporation temperature can be detected through the evaporation temperature detection module, and the low-pressure can be calculated from the evaporation temperature.

[0032] Because the relationship between low pressure and evaporation temperature can change due to differences in the cooling capacity of the air conditioning unit and the installation scenario, the air conditioning unit incorporates the influence of the cooling capacity of the air conditioning unit and the installation scenario on the relationship between low pressure and evaporation temperature into the low pressure determination process. This improves the adaptability of low pressure to the air conditioning cooling capacity, installation scenario and evaporation temperature, and enhances the accuracy of low pressure determination.

[0033] The air conditioning unit includes an evaporation temperature detection module for detecting evaporation temperature signals; the low-pressure determination method is as follows: The evaporation temperature signal is detected by the evaporation temperature detection module.

[0034] The evaporation temperature is determined based on the evaporation temperature signal.

[0035] Obtain the horsepower and piping length of the air conditioning unit, and then derive the pressure correction factor for this air conditioning unit from the pre-determined pressure correction factor relationship between the horsepower and piping length of the air conditioning unit.

[0036] The predetermined pressure correction coefficient relationship between the horsepower of the air conditioning unit and the piping length refers to obtaining the pressure correction coefficient between the horsepower of the air conditioning unit and the piping length by conducting experiments to detect the evaporation temperature and low pressure corresponding to several different horsepower of air conditioning units and several different piping lengths.

[0037] In some embodiments, the correspondence between the horsepower of the air conditioning unit and the pressure correction factor corresponding to the piping length is stored in a list format.

[0038] In some embodiments, the correspondence between the horsepower of the air conditioning unit and the pressure correction factor corresponding to the piping length is stored in the form of a function.

[0039] In some embodiments, the horsepower of the air conditioning unit and the piping length are entered manually.

[0040] In some embodiments, the air conditioning unit receives the horsepower of the air conditioning unit and the piping length from other devices.

[0041] In some embodiments, the air conditioning unit autonomously detects the horsepower of the air conditioning unit and the length of the piping.

[0042] The low-pressure unit of the air conditioning system is determined based on the evaporation temperature and pressure correction factor.

[0043] The air conditioning unit determines the pressure correction coefficient in advance based on the unit's capacity, piping length, and the relationship between low pressure and evaporation temperature. During operation, the pressure correction coefficient is first determined based on the unit's capacity and piping length, and then the low pressure is determined based on the evaporation temperature and pressure correction coefficient. Therefore, the low pressure determined by the air conditioning unit can be matched with the unit's cooling capacity and the actual installation, making the determined low pressure more accurate.

[0044] exist Figure 1 In the example, the method for determining the low-pressure of the air conditioning unit is as follows: S1, detect the evaporation temperature signal.

[0045] S2. Determine the evaporation temperature based on the evaporation temperature signal.

[0046] S3. Obtain the horsepower of the air conditioning unit and the length of the piping.

[0047] S4. Based on the horsepower of the air conditioning unit and the piping length, obtain the pressure correction coefficient corresponding to this air conditioning unit from the pre-determined pressure correction coefficient relationship between the horsepower of the air conditioning unit and the piping length.

[0048] S5. Determine the low-pressure unit of the air conditioning system based on the evaporation temperature and pressure correction coefficient. Proceed to step S1.

[0049] Since the relationship between evaporation temperature and evaporation temperature detection signal is affected by the cooling capacity of the air conditioning unit and the outdoor ambient temperature, the relationship between evaporation temperature and evaporation temperature detection signal is obtained in advance through experiments for several outdoor ambient temperature ranges and several horsepower, and the temperature correction coefficients corresponding to several outdoor ambient temperature ranges and several horsepower are obtained.

[0050] In some embodiments, the correspondence between the outdoor ambient temperature range of the air conditioning unit and the temperature correction coefficient corresponding to the horsepower is stored in a list format.

[0051] In some embodiments, the correspondence between the outdoor ambient temperature range of the air conditioning unit and the temperature correction coefficient corresponding to the horsepower is stored in the form of a function.

[0052] The evaporation temperature is obtained from the evaporation temperature signal, the compressor operating frequency, and the temperature correction factor.

[0053] During cooling, the evaporation temperature signal is the lowest temperature of the indoor heat exchanger.

[0054] During heating, the evaporation temperature signal is the liquid pipe temperature of the outdoor heat exchanger or the lowest temperature of the outdoor heat exchanger; the temperature correction coefficient is determined by the outdoor ambient temperature range and the horsepower.

[0055] exist Figure 2 In the example, the evaporation temperature is determined in cooling mode as follows: S1, Cooling mode activated.

[0056] S2. Obtain the lowest temperature at the lowest point of the indoor heat exchanger as the evaporation temperature signal.

[0057] S3. Obtain the compressor operating frequency.

[0058] S4. Obtain the outdoor ambient temperature range and horsepower.

[0059] S5. Obtain the temperature correction coefficient based on the outdoor ambient temperature range and horsepower.

[0060] S6. Obtain the evaporation temperature using the evaporation temperature signal, compressor operating frequency, and temperature correction coefficient. Proceed to step S2.

[0061] exist Figure 3 In the example, the evaporation temperature is determined in heating mode as follows: S1, Heating mode activated.

[0062] S2. Obtain the liquid pipe temperature of the outdoor heat exchanger or the lowest temperature at the lowest point of the outdoor heat exchanger as the evaporation temperature signal.

[0063] S3. Obtain the compressor operating frequency.

[0064] S4. Obtain the outdoor ambient temperature range and horsepower.

[0065] S5. Obtain the temperature correction coefficient based on the outdoor ambient temperature range and horsepower.

[0066] S6. Obtain the evaporation temperature using the evaporation temperature signal, compressor operating frequency, and temperature correction coefficient. Proceed to step S2.

[0067] In some embodiments, during the set time of the air conditioner's start-up, the evaporation temperature signal is the liquid pipe temperature of the outdoor heat exchanger; after the set time of the air conditioner's start-up, the evaporation temperature signal is the lowest temperature of the outdoor heat exchanger. This ensures that the obtained evaporation temperature signal is always the lowest temperature, thereby improving the accuracy of the evaporation temperature and thus improving the accuracy of the low-pressure determination.

[0068] exist Figure 4 In the example, the evaporation temperature is determined in heating mode as follows: S1, Heating mode activated.

[0069] S2. Determine if the air conditioner is turned on within the set time. If so, proceed to step S3; otherwise, proceed to step S4.

[0070] S3. Obtain the liquid pipe temperature of the outdoor heat exchanger as the evaporation temperature signal.

[0071] S4. Obtain the lowest temperature at the lowest point of the outdoor heat exchanger as the evaporation temperature signal.

[0072] S5. Obtain the compressor operating frequency.

[0073] S6. Obtain the outdoor ambient temperature range and horsepower.

[0074] S7. Obtain the temperature correction coefficient based on the outdoor ambient temperature range and horsepower.

[0075] S8. Obtain the evaporation temperature using the evaporation temperature signal, compressor operating frequency, and temperature correction coefficient. Proceed to step S2.

[0076] In some embodiments, the temperature correction factor includes a first temperature correction factor v1, a second temperature correction factor v2, and a third temperature correction factor v3.

[0077] Evaporation temperature Tv = Evaporation temperature signal Tv' + First temperature correction coefficient v1 + Compressor operating frequency F * Second temperature correction coefficient v2 + Third temperature correction coefficient v3 * Constant.

[0078] In some embodiments, the evaporation temperature Tv is set to an upper limit value x. When the calculated evaporation temperature is lower than the upper limit value x, the calculated evaporation temperature Tv is used as the evaporation temperature. When the calculated evaporation temperature is higher than the upper limit value x, the upper limit value x is used as the evaporation temperature.

[0079] In some embodiments, the air conditioning unit has a self-cleaning mode. When the air conditioning unit is in the self-cleaning state, the constant is α, and when it is in other states, the constant is β, where α ≠ β.

[0080] exist Figure 5 In the example, the evaporation temperature is determined as follows: S1, Begin.

[0081] S2. Is it in self-cleaning mode? If yes, proceed to step S3; otherwise, proceed to step S5. S3. Obtain the evaporator temperature signal, obtain the compressor operating frequency, obtain the outdoor ambient temperature range and horsepower to obtain the temperature correction coefficient.

[0082] S4, Evaporation temperature Tv = Evaporation temperature signal Tv' + First temperature correction coefficient v1 + Compressor operating frequency F * Second temperature correction coefficient v2 + Third temperature correction coefficient v3 * α. Proceed to step S2.

[0083] S5. Obtain the evaporator temperature signal, obtain the compressor operating frequency, obtain the outdoor ambient temperature range and horsepower to obtain the temperature correction coefficient.

[0084] S6, Evaporation temperature Tv = Evaporation temperature signal Tv' + First temperature correction coefficient v1 + Compressor operating frequency F * Second temperature correction coefficient v2 + Third temperature correction coefficient v3 * β. Proceed to step S2.

[0085] The compressor may use a single-phase motor or a three-phase motor. Single-phase and three-phase motors will have different effects on low-pressure. Therefore, it is necessary to distinguish between single-phase and three-phase motors. Obtain compressor information. When the compressor is a single-phase motor, the low-pressure Px is determined based on the first pressure correction coefficient k1 and the evaporation temperature Tv.

[0086] In some embodiments, when the compressor is a single-phase motor, the low-pressure Px = first pressure correction coefficient k1 * evaporation temperature Tv.

[0087] exist Figure 6 In the example, the method for determining the low-voltage pressure of a single-phase motor is as follows: S1, Begin.

[0088] S2, detect the evaporation temperature signal.

[0089] S3. Determine the evaporation temperature based on the evaporation temperature signal.

[0090] S4. Obtain the horsepower of the air conditioning unit and the length of the piping.

[0091] S5. Determine the first pressure correction factor corresponding to this air conditioning unit based on the horsepower of the air conditioning unit and the length of the piping.

[0092] S6. Determine the low-pressure unit of the air conditioning system based on the evaporation temperature and the first pressure correction coefficient. Proceed to step S2.

[0093] Obtain compressor information. When the compressor is a three-phase motor, the low-pressure Px is determined based on the first pressure correction coefficient k1, the evaporation temperature Tv, and the second pressure correction coefficient k2.

[0094] In some embodiments, when the compressor is a three-phase motor, the low pressure Px = first pressure correction coefficient k1 * evaporation temperature Tv + second pressure correction coefficient k2.

[0095] existFigure 7 In the example, the method for determining the low-voltage pressure of the three-phase motor is as follows: S1, Begin.

[0096] S2, detect the evaporation temperature signal.

[0097] S3. Determine the evaporation temperature based on the evaporation temperature signal.

[0098] S4. Obtain the horsepower of the air conditioning unit and the length of the piping.

[0099] S5. Based on the horsepower of the air conditioning unit and the length of the piping, determine the first pressure correction factor and the second pressure correction factor corresponding to this air conditioning unit.

[0100] S6. Determine the low-pressure unit of the air conditioning system based on the evaporation temperature, the first pressure correction factor, and the second pressure correction factor. Proceed to step S2.

[0101] In some embodiments, since the evaporation temperature has a certain lag, while the overall current reflects the low pressure more promptly, the overall current is used as a determining factor for the low pressure.

[0102] The corresponding low-pressure value P is determined based on the evaporation temperature Tv.

[0103] In some embodiments, a database of evaporation temperature Tv and corresponding low-pressure value P is established, and the corresponding low-pressure value P of evaporation temperature Tv is read from the database.

[0104] In some embodiments, a functional correspondence is established between the evaporation temperature Tv and the corresponding low-pressure value P, and the corresponding low-pressure value P is calculated based on the functional correspondence.

[0105] Obtain the total unit current value Iinv. Read the DC current value Iinv from the outdoor unit control board.

[0106] The low-pressure Px is determined based on the corresponding low-pressure value P, the current value Iinv, the compressor operating frequency F, and the pressure correction coefficient.

[0107] In some embodiments, when the compressor is a single-phase motor, the low-pressure Px = third pressure correction coefficient k3 * corresponding low-pressure value P + fourth pressure correction coefficient k4 * current value Iinv / compressor operating frequency F.

[0108] exist Figure 8 In the example, the method for determining the low-voltage pressure of a single-phase motor is as follows: S1, Begin.

[0109] S2, detect the evaporation temperature signal.

[0110] S3. Determine the evaporation temperature based on the evaporation temperature signal, and determine the corresponding low-pressure value based on the evaporation temperature.

[0111] S4. Obtain the horsepower of the air conditioning unit and the length of the piping.

[0112] S5. Based on the horsepower of the air conditioning unit and the length of the piping, determine the third and fourth pressure correction factors corresponding to this air conditioning unit.

[0113] S6. Obtain the overall current value and compressor frequency.

[0114] S7. Determine the low-pressure unit based on the corresponding low-pressure value, current value, compressor operating frequency, third pressure correction factor, and fourth pressure correction factor. Proceed to step S2.

[0115] In some embodiments, when the compressor is a three-phase motor, the low-pressure Px = third pressure correction coefficient k3 * corresponding low-pressure value P + fourth pressure correction coefficient k4 * fifth pressure correction coefficient k5 * current value Iinv / compressor operating frequency F.

[0116] exist Figure 9 In the example, the method for determining the low-voltage pressure of the three-phase motor is as follows: S1, Begin.

[0117] S2, detect the evaporation temperature signal.

[0118] S3. Determine the evaporation temperature based on the evaporation temperature signal, and determine the corresponding low-pressure value based on the evaporation temperature.

[0119] S4. Obtain the horsepower of the air conditioning unit and the length of the piping.

[0120] S5. Based on the horsepower of the air conditioning unit and the length of the piping, determine the third, fourth, and fifth pressure correction factors corresponding to this air conditioning unit.

[0121] S6. Obtain the overall current value and compressor frequency.

[0122] S7. Determine the low-pressure unit based on the corresponding low-pressure value, current value, compressor operating frequency, third pressure correction factor, fourth pressure correction factor, and fifth pressure correction factor. Proceed to step S2.

[0123] When the compressor frequency is low, the evaporation temperature regulation has virtually no lag. However, when the compressor frequency is high and the rate of change is large, the evaporation temperature regulation exhibits a certain lag. Therefore, the low-pressure value is further determined by the overall machine current value.

[0124] The method for determining the low-pressure area is as follows: Obtain the compressor operating frequency; When the compressor operating frequency does not exceed the set frequency, the low-pressure is determined based on the evaporation temperature and pressure correction factor.

[0125] When the compressor is a single-phase motor, Figure 6 The method for determining low pressure is as follows.

[0126] When the compressor is a three-phase motor, Figure 7 The method for determining low pressure is as follows.

[0127] When the compressor operating frequency exceeds the set frequency, the corresponding low-pressure value is determined based on the evaporation temperature; the overall current value is obtained; the low-pressure value is determined based on the corresponding low-pressure value, current value, compressor operating frequency, and pressure correction coefficient.

[0128] When the compressor is a single-phase motor, Figure 8 The method for determining low pressure is as follows.

[0129] When the compressor is a three-phase motor, Figure 9 The method for determining low pressure is as follows.

[0130] The set frequency is any value between 30-50Hz.

[0131] exist Figure 10 In the example, the method for determining the low-pressure area is as follows: S1, Begin.

[0132] S2. Obtain the compressor operating frequency.

[0133] S3. Determine if the set frequency is exceeded. If yes, proceed to step S4; otherwise, proceed to step S5.

[0134] S4. The low-pressure setting is determined based on the evaporation temperature and pressure correction factor.

[0135] When the compressor is a single-phase motor, specifically... Figure 6 The method for determining low pressure is as follows.

[0136] When the compressor is a three-phase motor, specifically... Figure 7 The method for determining low pressure is as follows.

[0137] S5. Determine the corresponding low-pressure value based on the evaporation temperature; obtain the overall current value; the low-pressure value is determined based on the corresponding low-pressure value, current value, compressor operating frequency, and pressure correction coefficient.

[0138] When the compressor is a single-phase motor, specifically... Figure 8 The method for determining low pressure is as follows.

[0139] When the compressor is a three-phase motor, specifically... Figure 9 The method for determining low pressure is as follows.

[0140] Therefore, when the compressor frequency of an air conditioning unit is low, the evaporation temperature delay is small, and the low pressure can be determined by the evaporation temperature and pressure correction coefficient. When the compressor frequency is high, the frequency changes faster, and the evaporation temperature change has a certain time lag. In this case, the low pressure is determined by the corresponding low pressure value, the whole unit current value, the compressor operating frequency, and the pressure correction coefficient. Directly using the whole unit current value as one of the factors for determining the low pressure can more timely reflect the evaporation temperature change trend of the air conditioning unit, thereby improving the timeliness of the low pressure and avoiding lag.

[0141] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0142] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioning device, the air conditioning device comprising an evaporator temperature detection module, characterized in that, The low-pressure setting of the air conditioning unit is determined as follows: Detect the evaporation temperature signal; Determine the evaporation temperature based on the evaporation temperature signal; Obtain the horsepower and piping length of the air conditioning unit, and derive the pressure correction coefficient corresponding to the air conditioning unit from the predetermined pressure correction coefficient relationship between the horsepower and piping length of the air conditioning unit; The low-pressure of the air conditioning unit is determined based on the evaporation temperature and pressure correction coefficient.

2. The air conditioning device according to claim 1, characterized in that, The evaporation temperature is obtained by using the evaporation temperature signal, the compressor operating frequency, and the temperature correction coefficient. During cooling, the evaporation temperature signal is the lowest temperature of the indoor heat exchanger; During heating, the evaporation temperature signal is the liquid pipe temperature of the outdoor heat exchanger or the lowest temperature of the outdoor heat exchanger; the temperature correction coefficient is determined by the outdoor ambient temperature range and the horsepower.

3. The air conditioning device according to claim 2, characterized in that, During the set time of the air conditioner's start-up, the evaporation temperature signal is the liquid pipe temperature of the outdoor heat exchanger; after the set time of the air conditioner's start-up, the evaporation temperature signal is the lowest temperature of the outdoor heat exchanger.

4. The air conditioning device according to claim 2, characterized in that, The evaporation temperature = evaporation temperature signal + first temperature correction coefficient + compressor operating frequency * second temperature correction coefficient + third temperature correction coefficient * constant.

5. The air conditioning device according to claim 4, characterized in that, When the air conditioning unit is in self-cleaning mode, the constant is α; when it is in other modes, the constant is β.

6. The air conditioning device according to any one of claims 1-5, characterized in that, The compressor information is obtained. When the compressor is a single-phase motor, the low pressure is determined based on the first pressure correction coefficient and the evaporation temperature. When the compressor is a three-phase motor, the low pressure is determined based on the first pressure correction coefficient, the evaporation temperature, and the second pressure correction coefficient.

7. The air conditioning device according to claim 6, characterized in that, When the compressor is a single-phase motor, the low pressure = first pressure correction coefficient * evaporation temperature; When the compressor is a three-phase motor, the low pressure is equal to the first pressure correction factor * evaporation temperature + the second pressure correction factor.

8. The air conditioning device according to any one of claims 1-5, characterized in that, The corresponding low-pressure value is determined based on the evaporation temperature. Obtain the overall current value; The low-pressure value is determined based on the corresponding low-pressure value, the current value, the compressor operating frequency, and the pressure correction coefficient.

9. The air conditioning device according to claim 8, characterized in that, When the compressor is a single-phase motor, the low pressure = third pressure correction coefficient * corresponding low pressure value + fourth pressure correction coefficient * current value / compressor operating frequency; When the compressor is a three-phase motor, the low pressure = third pressure correction coefficient * corresponding low pressure value + fourth pressure correction coefficient * fifth pressure correction coefficient * current value / compressor operating frequency.

10. The air conditioning device according to any one of claims 1-5, characterized in that, Obtain the compressor operating frequency; When the compressor operating frequency does not exceed the set frequency, the low pressure is determined based on the evaporation temperature and the pressure correction coefficient; When the compressor operating frequency exceeds the set frequency, the corresponding low-pressure value is determined based on the evaporation temperature; the overall machine current value is obtained. The low-pressure value is determined based on the corresponding low-pressure value, the current value, the compressor operating frequency, and the pressure correction coefficient.

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