Differential Pressure Detection Method of Compressor, Air Conditioner and Computer Readable Storage Medium

Abstract

The present invention discloses a differential pressure detection method for a compressor, comprising the following steps: obtaining the input power of the compressor and the refrigerant output volume flow rate of the compressor; determining the differential pressure value of the compressor according to the input power, the refrigerant output volume flow rate and a power correction coefficient. The present invention also discloses an air conditioner and a computer-readable storage medium. The present invention determines the differential pressure value of the compressor through the input power of the compressor, the refrigerant output volume flow rate and the power correction coefficient, wherein the input power and the refrigerant volume flow rate can be detected based on the devices configured in the air conditioner itself, without additionally configuring detection devices, which can save the setting of detection devices and can also achieve the purpose of detecting the differential pressure value of the compressor, reducing the cost of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a method for detecting the pressure difference of a compressor, an air conditioner, and a computer-readable storage medium. Background Art

[0002] When the compressor of an air conditioner operates, there are requirements for the operating pressure difference within a certain range. If the pressure difference is too small, it will cause difficulties in supplying oil to the compressor; if the pressure difference is too large, it will cause wear due to excessive torque. Therefore, during the operation of the air conditioner, it is generally necessary to detect the pressure difference of the compressor.

[0003] Currently, the conventional method for detecting the pressure difference of a compressor is to separately detect the pressure at the intake end and the exhaust end of the compressor by adding pressure sensors, and then calculate the pressure difference of the compressor. However, this detection method has defects, such as adding pressure sensors, which increases the cost of the compressor.

[0004] It should be noted that the above content is only used to assist in understanding the technical problems solved by the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main object of the present invention is to provide a method for detecting the pressure difference of a compressor, an air conditioner, and a computer-readable storage medium, aiming to solve the technical problem that the conventional method for detecting the pressure difference of a compressor increases the cost of the compressor.

[0006] To achieve the above object, the present invention provides a method for detecting the pressure difference of a compressor, and the pressure difference detection method includes:

[0007] Obtain the input power of the compressor and the volume flow rate of the refrigerant output by the compressor;

[0008] Determine the pressure difference value of the compressor according to the input power, the volume flow rate of the refrigerant output, and the power correction coefficient.

[0009] Optionally, the step of determining the pressure difference value of the compressor according to the input power, the volume flow rate of the refrigerant output, and the power correction coefficient includes:

[0010] Determine the pressure difference value of the compressor according to the ratio of the product of the input power and the power correction coefficient to the volume flow rate of the refrigerant output.

[0011] Optionally, the method for obtaining the input power of the compressor includes:

[0012] Obtain the input voltage value and the input current value of the compressor;

[0013] Determine the input power of the compressor according to the input voltage value and the input current value.

[0014] Optionally, the method for obtaining the refrigerant output volume flow rate of the compressor includes:

[0015] Obtain the operating frequency of the compressor and the cylinder volume of the compressor;

[0016] Determine the refrigerant output volume flow rate according to the operating frequency and the cylinder volume.

[0017] Optionally, after the step of determining the pressure difference value of the compressor according to the input power, the refrigerant output volume flow rate, and the power correction coefficient, the method further includes:

[0018] When the pressure difference value is not within the preset range, adjust the operating frequency of the compressor so that the pressure difference value is within the preset range.

[0019] Optionally, the step of when the pressure difference value is not within the preset range, adjusting the operating frequency of the compressor so that the pressure difference value is within the preset range includes:

[0020] When the pressure difference value is greater than the upper limit value of the preset range, reduce the operating frequency of the compressor;

[0021] When the pressure difference value is less than the lower limit value of the preset range, increase the operating frequency of the compressor.

[0022] Optionally, before the step of determining the pressure difference value of the compressor according to the input power, the refrigerant output volume flow rate, and the power correction coefficient, the method further includes:

[0023] Send the identification information of the air conditioner where the compressor is located to other terminals, so that the other terminals can return the power correction coefficient corresponding to the air conditioner based on the identification information, and the power correction coefficients corresponding to different identification information are different.

[0024] The present invention further provides an air conditioner, which includes a memory, a processor, and a pressure difference detection program stored in the memory and executable on the processor. When the pressure difference detection program is executed by the processor, the steps of the above-mentioned pressure difference detection method of the compressor are implemented.

[0025] The present invention further provides a computer-readable storage medium, which stores a pressure difference detection program. When the pressure difference detection program is executed by a processor, each step of the above-mentioned pressure difference detection method of the compressor is implemented.

[0026] The differential pressure detection method, air conditioner, and computer-readable storage medium of the compressor provided by the present invention determine the differential pressure value of the compressor through the input power of the compressor, the refrigerant output volume flow rate, and the power correction coefficient. Among them, the input power and the refrigerant volume flow rate can be detected based on the devices configured in the air conditioner itself, without additionally configuring detection devices, which can save the setting of detection devices and also achieve the purpose of detecting the differential pressure value of the compressor, reducing the cost of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the hardware architecture of the air conditioner according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic flowchart of the first embodiment of the differential pressure detection method of the compressor of the present invention;

[0029] Figure 3 It is a schematic diagram of the system of the air conditioner to which the differential pressure detection method of the compressor of the present invention is applied;

[0030] Figure 4 It is a schematic flowchart of the second embodiment of the differential pressure detection method of the compressor of the present invention;

[0031] Figure 5 It is a schematic flowchart of the third embodiment of the differential pressure detection method of the compressor of the present invention.

[0032] Label Name Label Name 10 Compressor 20 Four-way valve 30 Outdoor heat exchanger 40 Throttle valve 50 Indoor heat exchanger 12 Suction pipeline 11 Exhaust pipeline 60 Drive circuit 70 Drive detection circuit

[0033] The realization, functional characteristics, and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] Since air conditioners not only have the functions of refrigeration and heating but also have other additional functions, they are increasingly favored by consumers. Therefore, air conditioners have generally entered households. During the operation of an air conditioner, it mainly relies on a compressor to compress the refrigerant to realize the change of the refrigerant from low temperature to high temperature, and then adjust the air temperature to realize the process of refrigeration and heating.

[0036] To ensure the stable operation of the compressor, it is generally necessary to set the capacity range of the compressor, that is, there are range requirements for the operating pressure difference of the compressor. This is to avoid difficulties in supplying oil to the compressor when the pressure difference is too small, or problems such as excessive torque and wear when the pressure difference is too large. Therefore, the air conditioner is equipped with a logic for controlling the pressure difference of the compressor. Specifically, pressure sensors are provided at the intake end and the exhaust end of the compressor, and the pressure difference of the compressor is determined by the difference between the two pressure sensors. Then, the operation of the compressor is controlled based on the detected pressure difference.

[0037] Based on the fact that adding pressure sensors will increase the cost of the compressor, this embodiment proposes a new method for detecting the pressure difference, which calculates the pressure difference of the compressor through the operating parameters of the system. The specific operating parameters include the input power, operating frequency, and cylinder volume of the compressor. Based on the principle of the conservation of mechanical energy of the input power and the compressor, the pressure difference generated after the compressor does work is calculated. While eliminating the setting of pressure sensors, the accuracy of the detected pressure difference is improved.

[0038] To better understand the above technical solution, the exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0039] As an implementation manner, the hardware environment architecture involved in the method for detecting the pressure difference of the compressor can be as Figure 1 shown.

[0040] Optionally, the hardware architecture involved in the method for detecting the pressure difference of the compressor can include a terminal. If the terminal is a mobile terminal or a central control device of an air conditioner, such as a large screen terminal with a display interface, the terminal is used to control the air conditioner. The hardware architecture involved in the method for detecting the pressure difference of the compressor can also be an air conditioner with a processor.

[0041] As an implementation manner, the terminal includes: a processor 101, such as a CPU, a memory 102, and a communication bus 103. Among them, the communication bus 103 is used to realize the connection and communication between these components. The processor 102 is used to call an application program to perform an adjustment operation.

[0042] The memory 102 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory.

[0043] It can be understood that, in one embodiment, the differential pressure detection program for implementing the adjustment process of the air conditioner is stored in the memory 102 of the air conditioner or in the memory 102 of the terminal. When the processor 101 calls the differential pressure detection program from the memory 102, the following operations are performed:

[0044] Obtain the input power of the compressor and the refrigerant output volume flow rate of the compressor;

[0045] Determine the differential pressure value of the compressor according to the input power, the refrigerant output volume flow rate, and the power correction coefficient.

[0046] Alternatively, in another embodiment, the differential pressure detection program for implementing the adjustment process of the air conditioner can also be stored in a computer-readable storage medium. When the storage medium is applied to a computer, the processor 101 of the computer can call the differential pressure detection program from the storage medium and execute the above detection process.

[0047] Based on the above hardware architecture of the air conditioner, the following embodiments of the present invention are proposed.

[0048] In the first embodiment, please refer to Figure 2 , the differential pressure detection method for the compressor proposed in this embodiment includes the following steps:

[0049] Step S10: Obtain the input power of the compressor and the refrigerant output volume flow rate of the compressor.

[0050] Step S20: Determine the differential pressure value of the compressor according to the input power, the refrigerant output volume flow rate, and the power correction coefficient.

[0051] The execution terminal in this embodiment can be a terminal that communicates with the air conditioner and enables the air conditioner to respond to the control quality, such as a mobile terminal, etc. It can also be the air conditioner. The following takes running on the air conditioner as an example for illustration:

[0052] For the air conditioning system, reasonable differential pressure control is a necessary factor to ensure the reliability of the system. Based on the example, the method of using a pressure sensor to detect the differential pressure in the air conditioner has the problem of high cost, or detecting the refrigerant temperature through the pipe temperature sensor in the heat exchanger, and there are problems of progress difference and detection delay in heat exchange through the refrigerant temperature.

[0053] Based on this, in this embodiment, since there is a positive correlation between the input power of the compressor and the pressure difference value, combined with the principle of conservation of energy, the pressure difference value of the compressor is calculated by the conservation of the input power and the mechanical work of the compressor. And because both the input power and the mechanical work of the compressor can be obtained through the devices configured in the air conditioner itself, in this way, the setting of the pressure sensor can be reduced, while the accuracy of the pressure difference detection is improved, and the pressure difference value can be obtained in real time based on the mechanical work of the compressor, which has timeliness and there is no problem of delay.

[0054] Optionally, during the operation of the air conditioner, the input power of the compressor is obtained in real time or at regular intervals. Optionally, the input power can be determined based on the model of the air conditioner and the current set temperature of the air conditioner.

[0055] Alternatively, it can also be determined by the compressor input voltage value and input current value detected in real time.

[0056] During the operation of the air conditioner, the refrigerant output volume flow rate of the compressor is also obtained, that is, the refrigerant output volume flow rate is obtained. Wherein, the refrigerant output volume flow rate refers to the volume of the refrigerant discharged by the compressor per unit time.

[0057] Furthermore, the pressure difference value is calculated according to the input power, the refrigerant output volume flow rate and the power correction coefficient.

[0058] Optionally, the input power is determined based on the input voltage value and the input current value. The specific obtaining methods include but are not limited to the following methods:

[0059] For example, in the first method: the input voltage value and the input current value are detected, and the product of the input voltage value and the input current value is used as the input power.

[0060] In this method, the accuracy of the obtained input power is high.

[0061] For example, in the second method: the input voltage value and the input current value are detected, and based on the preset mapping relationship between the input voltage value, the input current value and the input power, the input power is determined.

[0062] Wherein, the mapping relationship includes a discrete one-to-one mapping relationship. It can also include a mapping relationship with curve changes.

[0063] In this method, the operation process can be saved, and it can be adapted to air conditioners with lower computing capabilities.

[0064] Optionally, the refrigerant output volume flow rate can be directly detected by a flow meter.

[0065] Alternatively, in a preferred embodiment, it is determined based on the corresponding relationship between the operating frequency, the cylinder volume and the refrigerant output volume flow rate.

[0066] For example, detect the operating frequency of the compressor; then calculate the refrigerant output volume flow based on the product of the operating frequency of the compressor and the cylinder volume.

[0067] It should be noted that the compressor operating frequency refers to the number of times the cylinder performs a compression motion per unit time, and the refrigerant output volume flow refers to the volume of refrigerant discharged by the compressor per unit time. Each time the compressor moves, a volume corresponding to the cylinder volume is discharged into the heat exchanger. Therefore, the refrigerant output volume flow is equal to the product of the compressor operating frequency and the cylinder volume.

[0068] Optionally, the pressure difference value can be determined through a pre-set mapping relationship with the input power, the refrigerant output volume flow, and the power correction coefficient. For example, store this mapping relationship in a memory. During the actual operation of the air conditioner, after obtaining the input power, the refrigerant output volume flow, and the power correction coefficient, the corresponding pressure difference value can be obtained through this mapping relationship.

[0069] In some embodiments, the mapping relationship can be a discrete one-to-one correspondence, or a pressure difference model correspondence relationship generated by training a neural network model based on a large amount of data. That is, after inputting the input power, the refrigerant output volume flow, and the power correction coefficient into the pressure difference model, the pressure difference value is output.

[0070] Or, the pressure difference value has the following correlation relationship with the input power, the refrigerant output volume flow, and the power correction coefficient:

[0071] Wherein, △P is the pressure difference, P is the input power, M is the power correction coefficient, and L is the refrigerant output volume flow.

[0072] That is, the pressure difference value of the compressor is equal to the ratio of the product of the input power and the power correction coefficient to the refrigerant output volume flow.

[0073] Optionally, the product of the input power and the power correction coefficient is equal to the actual effective work of the compressor. The actual effective work of the compressor is converted into the energy of the refrigerant. Therefore, the energy of the refrigerant is equal to the product of the pressure difference of the compressor and the refrigerant output volume flow. Thus, the pressure difference value has the above correlation relationship with the input power, the refrigerant output volume flow, and the power correction coefficient.

[0074] Furthermore, since the operating power of the compressor can be actually calculated from the bus voltage and bus current of the compressor, and the refrigerant output volume flow can also be calculated through the operating frequency and the cylinder volume. Based on this, in this embodiment, the pressure difference value of the compressor can also be directly obtained through the following method:

[0075]

[0076] Among them, V is the bus voltage value of the compressor (i.e., the input voltage value of the compressor), I is the bus current value of the compressor (i.e., the input current value of the compressor), H is the operating frequency of the compressor; A is the cylinder volume of the compressor.

[0077] It can be seen that in this embodiment, the operating differential pressure of the compressor can be calculated in real time by detecting the operating frequency, bus voltage, and bus current of the compressor. The detection of the operating frequency, bus voltage, and bus current of the compressor has millisecond-level real-time performance, and the detection response is fast. The operating frequency, bus voltage, and bus current of the compressor can be collected through a drive sampling circuit. For a variable-frequency air-conditioning system, the drive sampling circuit is a standard configuration. Therefore, detecting the operating frequency, bus voltage, and bus current of the compressor does not increase the cost, and the differential pressure detection can be realized without a pressure sensor, making the cost of the air conditioner low and the detected differential pressure value highly reliable.

[0078] Optionally, on the one hand, since the drive motor of the compressor generates heat during operation, during the conversion of the input power of the compressor, part of the loss will be generated due to the heat generated by the drive motor. On the other hand, when the compressor does work on the gas, not all of the work done can be absorbed by the gas, and part of the loss will also be generated. In order to improve the accuracy of differential pressure detection, a power correction coefficient is used to correct the input power so that the corrected input power is the actual effective work of the compressor. The power correction coefficient is the ratio of the effective work of the compressor to the input power, that is, the power correction coefficient represents the energy conversion rate of the compressor except for losses.

[0079] The power correction coefficient can be preset in the air conditioner or sent to the air conditioner through real-time communication.

[0080] It can be understood that the power correction coefficient is a constant set before the air conditioner leaves the factory, and different air-conditioning products are different. It is obtained in advance through the following experimental methods:

[0081] Please refer to Figure 3, the air conditioner includes a compressor 10, a four-way valve 20, an outdoor heat exchanger 30, a throttle valve 40, and an indoor heat exchanger 50. Among them, the exhaust pipe 11 of the compressor 10 is communicated with the first valve port of the upper four-way valve 20, the suction pipe 12 of the compressor 10 is communicated with the second valve port of the upper four-way valve 20, one end of the indoor heat exchanger 50 is communicated with the third valve port of the upper four-way valve 20, and the other end is communicated with the outdoor heat exchanger 30. The end of the outdoor heat exchanger 30 far from the indoor heat exchanger 50 is communicated with the fourth valve port of the upper four-way valve 20. When the first valve port and the third valve port are conducted, the second valve port and the fourth valve port are conducted. When the first valve port and the fourth valve port are conducted, the second valve port and the third valve port are conducted. A throttle valve 40 is provided between the indoor heat exchanger 50 and the outdoor heat exchanger 30. Optionally, a throttle valve 40 is also provided between the indoor heat exchanger 50 and the upper four-way valve 20.

[0082] Optionally, a drive detection circuit 70 is provided on the drive circuit 60 of the compressor 10 for detecting the compressor bus voltage, compressor bus current, and operating frequency.

[0083] Based on the above structure of the air conditioner, the air conditioner is installed in a working condition laboratory and the whole machine runs. The drive detection circuit 70 monitors the operating frequency H, compressor bus voltage V, and compressor bus current I of the air conditioner and records them. At the same time, the pressure detection equipment in the working condition laboratory respectively collects the exhaust pressure of the compressor 10 on the exhaust pipe 11 of the compressor 10 and the suction pressure of the compressor 10 on the suction pipe 12 of the compressor 10, and the pressure difference △P is recorded by subtracting the suction pressure from the exhaust pressure.

[0084] Then, based on M = H * A * △P / (V * I), the value of M is calculated.

[0085] Among them, the value of M is the power correction coefficient, and A is the cylinder volume.

[0086] That is, before each model of air conditioner or each air conditioner leaves the factory, first test the power correction coefficient M of the air conditioner through the above experiment, and then during the actual use of the air conditioner, calculate the pressure difference value of the compressor in combination with the power correction coefficient.

[0087] Optionally, the power correction coefficient may vary based on the different models of the air conditioner or the air conditioner.

[0088] Alternatively, since the power conversion rate varies depending on the operating environment of the air conditioner, different M values can be measured under different operating conditions. During actual operation, the outdoor heat exchange can also be detected, and the operating condition of the air conditioner can be determined based on the outdoor heat exchange. Based on the mapping relationship between the operating condition and the power correction factor, the power correction factor under this operating condition can be determined, and then the pressure difference of the compressor under this condition can be calculated based on the power correction factor.

[0089] In this embodiment, the pressure difference of the compressor is determined by the input power of the compressor, the refrigerant output volume flow rate, and the power correction factor. Among them, the input power and the refrigerant volume flow rate can be detected based on the devices configured in the air conditioner itself, without additional detection devices, which can save the setting of detection devices and achieve the purpose of detecting the pressure difference of the compressor, reducing the cost of the air conditioner.

[0090] Based on the above embodiment, the second embodiment of the pressure difference detection method of the compressor is further provided in the embodiment of the present invention. Optionally: Please refer to Figure 4 , after step S20, it further includes:

[0091] Step S30, when the pressure difference is not within the preset range, adjust the operating frequency of the compressor so that the pressure difference is within the preset range.

[0092] Optionally, when the pressure difference is greater than the upper limit value of the preset range, reduce the operating frequency of the compressor.

[0093] When the pressure difference is less than the lower limit value of the preset range, increase the operating frequency of the compressor.

[0094] In order to make the compressor operate stably, a floating range allowed for the pressure difference during the stable operation of the compressor is preset, such as the preset range formed by the upper limit value and the lower threshold value.

[0095] After detecting the pressure difference of the compressor by using the detection method of the above embodiment, it is judged whether the pressure difference is within the preset range. If not, it means that the current pressure difference of the compressor is too large or too small. In order to avoid problems such as insufficient oil supply or excessive torque, the operating frequency of the compressor is automatically adjusted. If it is within the preset range, no adjustment is required.

[0096] It should be noted that the frequency adjustment is achieved by adjusting the input current. When the frequency changes, the input current also changes. Based on this, the pressure difference of the compressor is gradually reduced.

[0097] Among them, the frequency adjustment method varies depending on the specific magnitude of the pressure difference:

[0098] For example, compare the pressure difference value with the upper limit value of the preset range. If the pressure difference value is greater than the upper limit value, it indicates that the current pressure difference of the compressor is large. At this time, reduce the operating frequency of the compressor.

[0099] Or, if the pressure difference value is less than the lower limit value, it indicates that the current pressure difference of the compressor is small. At this time, increase the operating frequency of the compressor.

[0100] Optionally, the value range of the upper limit value ∈ [3, 10] MPa; the value range of the lower limit value ∈ (0, 3] MPa.

[0101] Optionally, set the decrease value of the operating frequency. During the frequency reduction process of this embodiment, on the basis of the current frequency, reduce the decrease value. After a preset time interval, detect again whether the pressure difference value of the compressor is less than or equal to the first preset value. If it is still not less than or equal to the first preset value, continue to decrease the decrease value on the basis of the current frequency until it is detected that the pressure difference value is less than or equal to the first preset value.

[0102] Optionally, the first preset value is less than or equal to the upper limit value. In a preferred embodiment, in order to enable the pressure difference to be maintained in a stable state after reduction and still be within the preset range within a certain time, during each adjustment, reduce the pressure difference to below the first preset value less than the upper limit value, and then restore the target operating frequency of the compressor.

[0103] Optionally, set the increase value of the operating frequency. During the frequency increase process of this embodiment, on the basis of the current frequency, increase the increase value. After a preset time interval, detect again whether the pressure difference value of the compressor is greater than or equal to the second preset value. If it is still not greater than or equal to the second preset value, continue to increase the increase value on the basis of the current frequency until it is detected that the pressure difference value is greater than or equal to the second preset value.

[0104] Optionally, the second preset value is greater than or equal to the lower limit value. In a preferred embodiment, in order to enable the pressure difference to be maintained in a stable state after increase and still be within the preset range within a certain time, during each adjustment, increase the pressure difference to above the first preset value greater than the upper limit value, and then restore the target operating frequency of the compressor.

[0105] The preset time interval has different values based on different types of air conditioners, and the value range of the preset time interval ∈ [1, 1000] s.

[0106] Optionally, if after frequency modulation of the compressor and the difference between the operating frequency of the compressor and the target frequency is greater than the third preset value, and the pressure difference of the compressor is still not within the preset range, start shutdown protection and stop the compressor from running.

[0107] This embodiment implements over-high pressure or under-low pressure protection for the compressor by adjusting the operating frequency of the compressor.

[0108] Based on all the above embodiments, the present invention also provides a third embodiment of the pressure difference detection method of the compressor. Optionally, please refer to Figure 5 , before step S20, further comprising:

[0109] Step S40, sending the identification information of the air conditioner where the compressor is located to other terminals, so that the other terminals return the power correction coefficient corresponding to the air conditioner based on the identification information, and different identification information corresponds to different power correction coefficients.

[0110] After receiving the power correction coefficient returned by other terminals, it is used for pressure difference calculation.

[0111] The other terminal may be a server, or may be another air conditioner in the same area as the air conditioner, or may be a mobile terminal for controlling the air conditioner.

[0112] It is understandable that the power correction coefficient M can be stored in the memory of each air conditioner and directly retrieved from the memory of the air conditioner when it is used.

[0113] Alternatively, in some embodiments, the power correction coefficient M of the air conditioner can be uniformly stored in the background server, and during the pressure difference detection process, the power correction coefficient M of the air conditioner is obtained through the background server to calculate the pressure difference. This embodiment can save the process of internalizing the power correction coefficient M.

[0114] In addition, the power conversion rate of the air conditioner may be different under different working conditions, or the operating capacity of the air conditioner may change after a certain period of operation, and the power conversion rate may decrease. The power correction coefficient is stored in the background server, so that the power correction coefficient can be regularly replaced according to the operating time or operating environment of the air conditioner, so as to improve the accuracy of the pressure difference.

[0115] Alternatively, in some embodiments, the power correction coefficient can also be obtained based on multiple air conditioners of the same model in the same area. For example, when an air conditioner is newly installed, by searching for air conditioners of the same model within a preset range, establishing communication, and requesting each of the air conditioners to send the power correction coefficient. Then, the power correction coefficient of the local end is determined based on the power correction coefficients returned by the multiple air conditioners.

[0116] Among them, the power correction coefficient with the highest frequency of use is used as the power correction coefficient of this end, and then the pressure difference is calculated.

[0117] Optionally, an embodiment of the present application further provides a computer program product, which includes differential pressure detection program code. When the differential pressure detection program code is executed by a processor of a computer or other device, the above embodiments are implemented.

[0118] It should be noted that the above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A method for detecting the pressure difference of a compressor, characterized in that, the method for detecting the pressure difference of the compressor comprises the following steps: Obtain the input power of the compressor and the refrigerant output volume flow rate of the compressor; Determine the pressure difference value of the compressor according to the ratio of the product of the input power and the power correction coefficient to the refrigerant output volume flow rate.

2. The method for detecting the pressure difference of a compressor according to claim 1, characterized in that, the obtaining method of the input power of the compressor comprises: Obtain the input voltage value and the input current value of the compressor; Determine the input power of the compressor according to the input voltage value and the input current value.

3. The method for detecting the pressure difference of a compressor according to claim 1, characterized in that, the obtaining method of the refrigerant output volume flow rate of the compressor comprises: Obtain the operating frequency of the compressor and the cylinder volume of the compressor; Determine the refrigerant output volume flow rate according to the operating frequency and the cylinder volume.

4. The method for detecting the pressure difference of a compressor according to any one of claims 1 to 3, characterized in that, after the step of determining the pressure difference value of the compressor according to the input power, the refrigerant output volume flow rate and the power correction coefficient, the method further comprises: When the pressure difference value is not within the preset range, adjust the operating frequency of the compressor so that the pressure difference value is within the preset range.

5. The method for detecting the pressure difference of a compressor according to claim 4, characterized in that, the step of adjusting the operating frequency of the compressor when the pressure difference value is not within the preset range so that the pressure difference value is within the preset range comprises: When the pressure difference value is greater than the upper limit value of the preset range, reduce the operating frequency of the compressor; When the pressure difference value is less than the lower limit value of the preset range, increase the operating frequency of the compressor.

6. The method for detecting the pressure difference of a compressor according to claim 1, characterized in that, before the step of determining the pressure difference value of the compressor according to the input power, the refrigerant output volume flow rate and the power correction coefficient, the method further comprises: Send the identification information of the air conditioner where the compressor is located to other terminals, so that other terminals return the power correction coefficient corresponding to the air conditioner based on the identification information, and the power correction coefficients corresponding to different identification information are different.

7. An air conditioner, characterized in that, the air conditioner comprises a memory, a processor and a pressure difference detection program stored in the memory and operable on the processor, and when the pressure difference detection program is executed by the processor, the steps of the method for detecting the pressure difference of the compressor according to any one of claims 1-6 are realized.

8. A computer-readable storage medium, characterized in that, the computer-readable storage medium stores a pressure difference detection program, and when the pressure difference detection program is executed by a processor, each step of the method for detecting the pressure difference of the compressor according to any one of claims 1-6 is realized.

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