A refrigerant filling amount and vacuum degree detection method, device and air conditioner

Abstract

The present invention provides a method, device and air conditioner for detecting refrigerant filling amount and vacuum degree. When the operating power of the air conditioner unit is too large, the automatic detection mode is started to detect the vacuum degree H of the refrigerant pipeline to determine whether the vacuum degree of the refrigerant pipeline is pumped in place. In the state where the vacuum degree detection is pumped in place, the operating power of the compressor of the air conditioner unit is reduced, and based on the air conditioner unit operating according to the nameplate power, when the heating and cooling capacity parameters of the air conditioner unit are low, the refrigerant detection device is started to obtain the relative error coefficient ε of the refrigerant volume flow rate in the refrigerant pipeline, so as to realize the detection and judgment of whether the filling amount of the air conditioner unit meets the requirements. The method for detecting refrigerant filling amount and vacuum degree described in the present invention can be applied to the installation process and the maintenance process, and can quickly and reliably complete the detection of whether the vacuum degree and the refrigerant filling amount meet the requirements when the power of the air conditioner unit exceeds the standard, greatly improving the detection efficiency and ensuring the detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly relates to a method and device for detecting refrigerant filling amount and vacuum degree, and an air conditioner. Background Art

[0002] Currently, in the household appliance and air conditioner industries, there is a problem that due to insufficient evacuation of air conditioners, the power of the air conditioner unit exceeds the standard after operation, and the equivalent level is very low.

[0003] In order to check whether the power exceeding the standard is caused by insufficient vacuum degree, it is often necessary to completely discharge the refrigerant in the unit, evacuate the air twice, and then add the same amount of refrigerant for testing. The detection method is inefficient, the current vacuum degree is unknown, and refrigerant is wasted.

[0004] Based on this, the present invention is specifically proposed to effectively improve the detection efficiency. Summary of the Invention

[0005] In view of this, the present invention aims to provide a method and device for detecting refrigerant filling amount and vacuum degree, and an air conditioner, so as to solve the problem of low efficiency in calibrating influencing factors when the air conditioner unit operates beyond the standard in the prior art.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows:

[0007] A method for detecting refrigerant filling amount and vacuum degree includes the following steps:

[0008] S1: The air conditioner unit starts the automatic detection mode;

[0009] S2: Adjust to operate at the locked parameters for a running time T1, and obtain the stable average power parameter Px1;

[0010] S3: Judge whether Px1 > the preset P*A. If so, go to S4; if not, go to S12;

[0011] S4: Start the vacuum detection device to detect and display the current vacuum degree H of the refrigerant pipeline;

[0012] S5: Judge whether the vacuum degree H > the preset value H 预 , if so, go to S6; if not, go to S11;

[0013] S6: Reduce the operating frequency of the compressor. The compressor operates according to the preset P for a running time T2, and obtain the stable average heating and cooling capacity parameter Wx1;

[0014] S7: Judge whether Wx1 < the preset W*B. If not, go to S12; if so, go to S8;

[0015] S8: Start the refrigerant detection device, calculate and display the relative error coefficient ε of the refrigerant volume flow rate in the current refrigerant pipeline;

[0016] S9: If the relative error coefficient ε of the refrigerant volume flow rate > the critical relative error coefficient ε 临界 , then go to S10;

[0017] S10: The refrigerant filling amount is insufficient, add refrigerant, and return to S1;

[0018] S11: The degree of vacuum extraction is insufficient, evacuate the vacuum again, and return to S1;

[0019] S12: Turn off the detection device, exit the locked parameter operation mode, and enter S13;

[0020] S13: Resume the initial parameter operation;

[0021] Among them, the preset P is the nameplate power parameter of the air conditioner unit, the preset W is the nameplate cooling and heating capacity parameter of the air conditioner unit, and the preset value H 预 is the preset vacuum parameter that meets the refrigerant working requirements of the air conditioner unit, A and B are preset constant parameters, A > 100%, B < 100%, and T1, T2 are preset time parameters.

[0022] Furthermore, in step S2, the locked parameter operation of the air conditioner unit is the rated refrigeration mode operation of the air conditioner unit, and the locked parameters include the compressor frequency, the external unit speed, the internal unit speed, and the air deflector swing angle.

[0023] Furthermore, in step S4, the vacuum detection device 3 is connected between the throttling device 1 and the condensing device 4 through the first one-way valve 2 and the second one-way valve 8. When detecting the current vacuum degree H of the refrigerant pipeline, the first one-way valve 2 is closed and the second one-way valve 8 is opened, and the vacuum detection device 3 is connected and turned on to directly detect the current vacuum degree H in the unit.

[0024] Furthermore, the vacuum detection device is connected in parallel on the refrigerant pipeline between the throttling device and the condensing device, connected to the outlet section of the external unit condensing device, and the flow path state is switched through the first one-way valve and the second one-way valve. When it is necessary to detect the vacuum degree H of the refrigerant pipeline, the second one-way valve in series with the vacuum detection device is opened, and the refrigerant flows into the connected vacuum detection device along the parallel pipeline flow path. In the normal working state, the first one-way valve is opened and the second one-way valve is closed, and the vacuum detection device does not work, and the refrigerant directly flows through the refrigerant pipeline between the throttling device and the condensing device.

[0025] Furthermore, in step S8, it includes the following steps:

[0026] S81: Start the refrigerant detection device;

[0027] S82: Obtain the refrigerant flow velocity Vx in the pipeline;

[0028] S83: Calculate the actual flow volume Qv of the pipeline;

[0029] S84: Calculate the relative error coefficient ε of the refrigerant volume flow rate;

[0030] Among them, the flow volume Qv = the refrigerant flow velocity Vx in the pipeline * the cross-sectional area of the pipeline in this place;

[0031] The theoretical volume flow rate Qv1 = the refrigerant gas constant Rg * the theoretical preset temperature Tg of the refrigerant / the theoretical nameplate Pg of the refrigerant;

[0032] ε = the flow volume Qv / the theoretical volume flow rate Qv1.

[0033] Furthermore, in step S82, the following steps are also included:

[0034] S821: Obtain the actual refrigerant pressure Px and Tx;

[0035] S822: Calculate the refrigerant flow velocity Vx according to the Pitot tube principle, and its measurement formula is:

[0036]

[0037] Among them: V: the flow velocity of the dynamic pressure volume flow sensor probe, m / s; K: the measurement coefficient; ▽p is the test pressure difference; ρ is the density of the measured medium, Kg / m 3 .

[0038] Furthermore, in step S83, the pipeline in calculating the actual flow volume Qv of the pipeline is the measurement section, the diameter of the measurement section is constant, and the cross-section does not change.

[0039] Furthermore, before step S1, the following steps are also included:

[0040] S01: Start the air conditioner unit and run it normally;

[0041] S02: Obtain the actual power parameter Px and obtain the actual heating and cooling capacity parameter Wx;

[0042] S03: When Px > the preset P*C or when Wx < the preset W*D, enter S1, otherwise, enter S13;

[0043] Among them, C ≤ A, D ≥ B.

[0044] Compared with the prior art, the refrigerant filling amount and vacuum degree detection method of the present invention has the following advantages:

[0045] (1) The refrigerant filling volume and vacuum degree detection method described in the present invention can detect the current vacuum degree value of the air conditioner without disassembling the machine when the power of the air conditioner unit exceeds the standard, and display the magnitude of the vacuum degree value. At the same time, it detects the refrigerant of the unit. By comparing the actual volume flow rate and the relative error coefficient, it detects whether the filling volume meets the requirements. This detection method is simple and greatly improves the detection efficiency and accuracy.

[0046] (2) The refrigerant filling volume and vacuum degree detection method described in the present invention can be applied to the installation process and the maintenance process. When the power of the air conditioner unit exceeds the standard, it can quickly and reliably complete the detection of whether the vacuum degree and the refrigerant filling volume meet the requirements, greatly improving the detection efficiency and ensuring the detection accuracy.

[0047] The second object of the present invention is to disclose a refrigerant filling volume and vacuum degree detection device, which is characterized in that it is used to execute the refrigerant filling volume and vacuum degree detection method as described above, and includes:

[0048] A detection module for detecting and obtaining the power parameter and the heating and cooling capacity parameter of the air conditioner unit during operation;

[0049] A vacuum detection device is connected in parallel to the refrigerant pipeline between the throttling device and the condensing device, and the state of the refrigerant flowing into the vacuum detection device is switched through the first one-way valve and the second one-way valve, and can obtain the refrigerant pipeline vacuum degree H of the air conditioner unit;

[0050] A refrigerant detection device is arranged between the condensing device and the compressor, and is used for detecting and calculating the actual flow volume Qv of the pipeline and calculating the relative error coefficient ε of the refrigerant volume flow rate;

[0051] A display module for displaying the refrigerant pipeline vacuum degree H and the relative error coefficient ε of the refrigerant volume flow rate of the air conditioner unit;

[0052] When the operating power Px of the air conditioner unit is greater than the preset P*C or the actual heating and cooling capacity parameter Wx is less than the preset W*D, without disassembling the machine, the detection module is used to obtain the stable average power parameter Px1 and the stable average heating and cooling capacity parameter Wx1 for the second time, and detect and display whether the refrigerant pipeline vacuum degree H and the relative error coefficient ε of the refrigerant volume flow rate of the air conditioner unit meet the preset requirements for normal operation. When the preset requirements are not met, continue to evacuate or re-inject the refrigerant filling volume for the second time.

[0053] The third object of the present invention is to disclose an air conditioner capable of performing the refrigerant filling amount and vacuum degree detection method as described above, including an evaporation device and a condensation device. Under the refrigeration condition, the refrigerant in the evaporation device flows through the compressor and the refrigerant detection device to the condensation device. A vacuum detection device is connected in parallel on the refrigerant pipeline between the condensation device and the throttling device. The pipeline of the vacuum detection device is connected in series with a second one-way valve. When the vacuum detection device is in the startup state, the refrigerant in the condensation device flows through the second one-way valve and the vacuum detection device to the throttling device. When the vacuum detection device is in the closed state, the refrigerant in the condensation device flows through the first one-way valve to the throttling device.

[0054] The advantages of the air conditioner, the refrigerant filling amount and vacuum degree detection device and the refrigerant filling amount and vacuum degree detection method relative to the prior art are the same, and will not be described herein again. Description of the Drawings

[0055] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0056] Figure 1 It is a logic schematic diagram of the air conditioner vacuum degree detection method described in the embodiment of the present invention;

[0057] Figure 2 It is a logic schematic diagram of calculating the relative error coefficient ε of refrigerant detection in the embodiment of the present invention;

[0058] Figure 3 It is a schematic diagram of the refrigerant flow path structure in the embodiment of the present invention;

[0059] Description of the reference numerals in the drawings:

[0060] Throttling device 1, first one-way valve 2, vacuum detection device 3, condensation device 4, refrigerant detection device 5, compressor 6, evaporation device 7, second one-way valve 8. Detailed Embodiments

[0061] In order to make the technical means, objectives and effects of the present invention easy to understand, the embodiments of the present invention will be described in detail below with reference to the specific drawings.

[0062] Embodiment 1

[0063] As Figures 1-2 shown, the present invention discloses a refrigerant filling amount and vacuum degree detection method, including the following steps:

[0064] S1: The air conditioner unit starts the automatic detection mode;

[0065] S2: Adjust to run at locked parameters for a running time of T1 to obtain a stable average power parameter Px1;

[0066] S3: Determine whether Px1 > preset P*A. If so, proceed to S4; if not, proceed to S12;

[0067] S4: Start the vacuum detection device to detect and display the current refrigerant pipeline vacuum degree H;

[0068] S5: Determine whether the vacuum degree H > preset value H 预 , if so, proceed to S6; if not, proceed to S11;

[0069] S6: Reduce the compressor operating frequency. The compressor operates according to the preset P for a running time of T2 to obtain a stable average heating and cooling capacity parameter Wx1;

[0070] S7: Determine whether Wx1 < preset W*B. If so, proceed to S12; if not, proceed to S8;

[0071] S8: Start the refrigerant detection device to calculate and display the relative error coefficient ε of the refrigerant volume flow rate in the current refrigerant pipeline;

[0072] S9: If the relative error coefficient ε of the refrigerant volume flow rate > critical relative error coefficient ε 临界 , then proceed to S10;

[0073] S10: The refrigerant filling amount is insufficient. Add refrigerant and return to S1;

[0074] S11: The vacuum extraction is insufficient. Re - evacuate and return to S1;

[0075] S12: Turn off the detection device, exit the locked parameter operation mode, and enter S13;

[0076] S13: Resume operation with initial parameters;

[0077] Among them, the preset P is the nameplate power parameter of the air - conditioning unit, the preset W is the nameplate heating and cooling capacity parameter of the air - conditioning unit, and the preset value H 预 is the vacuum degree preset parameter that meets the refrigerant working requirements of the air - conditioning unit. A and B are preset constant parameters, A > 100%, B < 100%, and T1, T2 are preset time parameters.

[0078] The refrigerant filling amount and vacuum degree detection method described in the present invention, when the operating power of the air conditioner unit is too large, without disassembling the machine, detects the vacuum degree H of the refrigerant pipeline by starting the automatic detection mode to determine whether the vacuum degree of the refrigerant pipeline is extracted in place. In the state where the vacuum degree detection is in place, the operating power of the compressor of the air conditioner unit is reduced. Based on the air conditioner unit operating at the nameplate power, when the heating and cooling capacity parameters of the air conditioner unit are low, by starting the refrigerant detection device, the relative error coefficient ε of the refrigerant volume flow rate in the refrigerant pipeline is obtained. According to the calculation results based on the law when establishing the ideal refrigerant model, when it is not in a high-temperature and high-pressure state, or when the refrigerant filling amount is insufficient, the critical relative error coefficient ε affected by the calculation is obtained. 临界 , that is, when the calculation exceeds this value, there are influencing factors, thereby realizing the detection and judgment of whether the filling amount of the air conditioner unit meets the requirements. As an example of the present invention, ε 临界 takes a value of 2.99. When the relative error coefficient ε of the refrigerant volume flow rate is greater than 2.99, it indicates that the filling amount of the refrigerant differs greatly from the designed filling amount. Therefore, there is a factor of incorrect refrigerant filling amount in the insufficient heating and cooling capacity of the air conditioner unit.

[0079] The refrigerant filling amount and vacuum degree detection method described in the present invention can detect the current vacuum degree value of the air conditioner without disassembling the machine when the power of the air conditioner unit exceeds the standard, and display the magnitude of the vacuum degree value. At the same time, it detects the refrigerant of the unit, and by comparing the actual volume flow rate and the relative error coefficient, it detects whether the filling amount meets the requirements. This detection method is simple and greatly improves the detection efficiency and detection accuracy.

[0080] As a preferred example of the present invention, in step S4, the vacuum detection device 3 is connected between the throttling device 1 and the condensing device 4 through the first one-way valve 2 and the second one-way valve 8. When detecting the current vacuum degree H of the refrigerant pipeline, the first one-way valve 2 is closed and the second one-way valve 8 is opened, and the vacuum detection device 3 is connected and turned on to directly detect the current vacuum degree H in the unit.

[0081] As a preferred example of the present invention, the vacuum detection device 3 is connected in parallel to the refrigerant pipeline between the throttling device 1 and the condensing device 4, and is connected to the outlet section of the outdoor condensing device 4, and the flow path state is switched through the first one-way valve 2 and the second one-way valve 8. When it is necessary to detect the vacuum degree H of the refrigerant pipeline, the second one-way valve 8 in series with the vacuum detection device 3 is opened, and the refrigerant is introduced into the connected vacuum detection device 3 along the parallel pipeline flow path. In the normal working state, the first one-way valve 2 is opened and the second one-way valve 8 is closed, and the vacuum detection device 3 does not work, and the refrigerant directly flows through the refrigerant pipeline between the throttling device 1 and the condensing device 4. As an example of the present invention, the vacuum detection device 3 can be a laboratory device or a commercially available device, which can detect the vacuum degree value of the air conditioner unit and give a vertical feedback or display.

[0082] The refrigerant filling amount and vacuum degree detection method described in the present invention can be applied to the installation process and the maintenance process. When the power of the air-conditioning unit exceeds the standard, it can quickly and reliably complete the detection of whether the vacuum degree and the refrigerant filling amount meet the requirements, greatly improving the detection efficiency and ensuring the detection accuracy.

[0083] As a preferred example of the present invention, in step S2, the locked parameter operation of the air-conditioning unit is the rated refrigeration mode operation of the air-conditioning unit, and the locked parameters include the compressor frequency, the external unit rotation speed, the internal unit rotation speed, and the air deflector swing angle.

[0084] By adjusting the air-conditioning unit to operate with locked parameters, it is possible to accurately determine whether the operating power of the air-conditioning unit exceeds the standard. Each model has a locked parameter compressor, and the locked parameters of different units are different. For example, for the 1 HP, level 1 energy efficiency model (R26W / BpR3Q(B1)) sold by the applicant, the rated refrigeration parameters are: compressor frequency 37HZ, external unit rotation speed 900R / MIN, internal unit rotation speed 1650R / MIN, and the air deflector swing angle is 58°.

[0085] As a preferred example of the present invention, in step S8, it includes the following steps:

[0086] S81: Start the refrigerant detection device;

[0087] S82: Obtain the refrigerant flow velocity Vx in the pipeline;

[0088] S83: Calculate the actual flow volume Qv of the pipeline;

[0089] S84: Calculate the relative error coefficient ε of the refrigerant volume flow rate;

[0090] Among them, the flow volume Qv = the refrigerant flow velocity Vx in the pipeline * the cross-sectional area of the pipeline in this place;

[0091] The theoretical volume flow rate Qv1 = the refrigerant gas constant Rg * the theoretical preset temperature Tg of the refrigerant / the theoretical nameplate Pg of the refrigerant. The theoretical nameplate Pg of the refrigerant is the pressure parameter when the refrigerant is in a gaseous state;

[0092] ε = the flow volume Qv / the theoretical volume flow rate Qv1.

[0093] In the example of the present invention, in step S82, it further includes the following steps:

[0094] S821: Obtain the actual refrigerant pressure Px and Tx;

[0095] S822: Calculate the refrigerant flow velocity Vx according to the Pitot tube principle, and its measurement formula is:

[0096]

[0097] Where: V: flow velocity of the probe of the dynamic pressure volume flow sensor, m / s; K: measurement coefficient; ▽p is the measured pressure difference; ρ is the density of the measured medium, Kg / m 3 .

[0098] In the refrigerant filling amount and vacuum degree detection method described in the present invention, when calculating the actual refrigerant flow rate, the refrigerant flow velocity Vx in the pipeline is calculated and obtained according to the Pitot tube principle. The dynamic pressure volume flow sensor can obtain the flow velocity at the center of the pipeline (total pressure - static pressure = dynamic pressure) and then convert it into the fluid volume, which is simple and efficient, and ensures the accurate calculation of the actual flow volume Qv of the pipeline, improving the reliability of the detection of the refrigerant filling amount and vacuum degree.

[0099] As a preferred example of the present invention, in step S83, the pipeline for calculating the actual flow volume Qv of the pipeline is the measurement section, the diameter of the measurement section is constant, and the cross-section does not change. As an example of the present invention, the measurement section is arranged at the front end of the throttling device 1.

[0100] As a preferred example of the present invention, in step S9, if the relative error coefficient ε of the calculated refrigerant volume flow rate is not greater than the critical relative error coefficient ε 临界 , it is possible to enter step S12, or other detection procedures can be adopted for further detection.

[0101] This setting further improves the accuracy of the calculation of the relative error coefficient ε of the refrigerant volume flow rate, ensuring the reliability of the detection of whether the refrigerant filling amount meets the requirements.

[0102] As a preferred example of the present invention, before step S1, the following steps are further included:

[0103] S01: The air conditioner unit starts and operates normally;

[0104] S02: Obtain the actual power parameter Px and obtain the actual heating and cooling capacity parameter Wx;

[0105] S03: When Px > preset P*C or when Wx < preset W*D, enter S1, otherwise, enter S13;

[0106] Where C ≤ A and D ≥ B.

[0107] This setting increases the conditions for the automatic detection mode of the air conditioner unit startup. By detecting whether the actual power parameter Px and the actual heating and cooling capacity parameter Wx under the normal operation state of the air conditioner unit meet the startup conditions of the automatic detection mode, the detection program is optimized, the calculation redundancy is reduced, and the reliability of the use of the refrigerant filling amount and vacuum degree detection method described in the present invention is improved.

[0108] As a preferred example of the present invention, the value of A is 110%, the value of B is 95%, the value of C is 107%, and the value of D is 96%. Through the above parameter limitations, the refrigerant filling amount and vacuum degree detection method of the present invention can quickly, accurately and reliably complete whether the vacuum degree and refrigerant filling amount of the air conditioner unit meet the requirements, greatly improving the detection efficiency.

[0109] The present invention also discloses a refrigerant filling amount and vacuum degree detection device for performing the above-mentioned refrigerant filling amount and vacuum degree detection method, including:

[0110] A detection module for detecting and obtaining the power parameter and heating and cooling capacity parameter of the air conditioner unit during operation;

[0111] A vacuum detection device 3 is connected in parallel on the refrigerant pipeline between the throttling device 1 and the condensing device 4, and the state of the refrigerant flowing into the vacuum detection device 3 is switched through the first one-way valve 2 and the second one-way valve 8, and the refrigerant pipeline vacuum degree H of the air conditioner unit can be obtained;

[0112] A refrigerant detection device 5 is arranged between the condensing device 4 and the compressor 6 for detecting and calculating the actual flow volume Qv of the pipeline and calculating the relative error coefficient ε of the refrigerant volume flow;

[0113] A display module for displaying the refrigerant pipeline vacuum degree H and the relative error coefficient ε of the refrigerant volume flow of the air conditioner unit;

[0114] When the operating power Px of the air conditioner unit is greater than the preset P*C or the actual heating and cooling capacity parameter Wx is less than the preset W*D, without disassembling the machine, the stable average power parameter Px1 and the stable average heating and cooling capacity parameter Wx1 are obtained again through the detection module, and it is detected and displayed whether the refrigerant pipeline vacuum degree H and the relative error coefficient ε of the refrigerant volume flow of the air conditioner unit meet the preset requirements for normal operation. When the preset requirements are not met, continue to evacuate or refill the refrigerant filling amount for the second time.

[0115] The present invention also discloses an air conditioner, including an evaporation device 7 and a condensing device 4. Under the refrigeration condition, the refrigerant in the evaporation device 7 flows through the compressor 6 and the refrigerant detection device 5 to the condensing device 4. A vacuum detection device 3 is connected in parallel on the refrigerant pipeline between the condensing device 4 and the throttling device 1, and the pipeline where the vacuum detection device 3 is arranged is connected in series with the second one-way valve 8. In the startup state of the vacuum detection device 3, the refrigerant in the condensing device 4 flows through the second one-way valve 8 and the vacuum detection device 3 to the throttling device 1. In the closed state of the vacuum detection device 3, the refrigerant in the condensing device 4 flows through the first one-way valve 2 to the throttling device 1. The structures of other pipeline connection structures and electrical components and their installation positions belong to the prior art and will not be elaborated here.

[0116] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for detecting the refrigerant filling amount and vacuum degree, characterized in that, It includes the following steps: S1: The air conditioner unit starts the automatic detection mode; S2: Adjust to run with locked parameters for a running time of T1, and obtain the stable average power parameter Px1; S3: Judge whether Px1 > the preset P*A. If so, enter S4; if not, enter S12; S4: Start the vacuum detection device (3) to detect and display the current vacuum degree H of the refrigerant pipeline; S5: Determine whether the vacuum degree H > the preset value H 预 , if yes, go to S6, if no, go to S11; S6: Reduce the operating frequency of the compressor. The compressor (6) operates according to the preset P for a running time of T2, and obtain the stable average cooling and heating capacity parameter Wx1; S7: Judge whether Wx1 < the preset W*B. If not, enter S12; if so, enter S8; S8: Start the refrigerant detection device (5), calculate and display the relative error coefficient ε of the refrigerant volume flow rate in the current refrigerant pipeline; S9: If the relative error coefficient ε of the refrigerant volume flow rate > the critical relative error coefficient ε 临界 , then go to S10; S10: The refrigerant filling amount is insufficient. Add refrigerant and return to S1; S11: The vacuum extraction is insufficient. Re - evacuate and return to S1; S12: Turn off the detection device, exit the locked - parameter operation mode, and enter S13; S13: Resume the operation with initial parameters; Wherein, the preset P is the nameplate power parameter of the air-conditioning unit, the preset W is the nameplate cooling and heating capacity parameter of the air-conditioning unit, and the preset value H 预 is the vacuum degree preset parameter to meet the refrigerant working requirements of the air-conditioning unit, A and B are preset constant parameters, A > 100%, B < 100%, T1 and T2 are preset time parameters; in step S4, the vacuum detection device (3) is connected between the throttling device (1) and the condensing device (4) through the first one-way valve (2) and the second one-way valve (8). When detecting the current refrigerant pipeline vacuum degree H, the first one-way valve (2) is closed, the second one-way valve (8) is opened, and the vacuum detection device (3) is introduced and connected to directly detect the current vacuum degree H in the unit.

2. The refrigerant filling amount and vacuum degree detection method according to claim 1, characterized in that In step S2, the locked - parameter operation of the air conditioner unit is the rated refrigeration mode operation of the air conditioner unit. The locked parameters include the compressor frequency, the outer - machine rotation speed, the inner - machine rotation speed, and the swing angle of the air deflector.

3. The refrigerant filling amount and vacuum degree detection method according to claim 2, characterized in that The vacuum detection device (3) is connected in parallel on the refrigerant pipeline between the throttling device (1) and the condensing device (4), connected to the outlet section of the outer - machine condensing device (4), and switches the flow - path state through the first check valve (2) and the second check valve (8). When it is necessary to detect the vacuum degree H of the refrigerant pipeline, the second check valve (8) in series with the vacuum detection device (3) opens, and the refrigerant is introduced into the connected vacuum detection device (3) along the parallel pipeline flow - path. In the normal working state, the first check valve (2) opens, the second check valve (8) closes, and the vacuum detection device (3) does not work, and the refrigerant directly flows through the refrigerant pipeline between the throttling device (1) and the condensing device (4).

4. The refrigerant filling amount and vacuum degree detection method according to claim 1, characterized in that In step S8, it includes the following steps: S81: Start the refrigerant detection device (5); S82: Obtain the refrigerant flow velocity Vx in the pipeline; S83: Calculate the actual flow volume Qv of the pipeline; S84: Calculate the relative error coefficient ε of the refrigerant volume flow rate; Among them, the flow volume Qv = the refrigerant flow velocity Vx in the pipeline * the cross - sectional area of the pipeline here; The theoretical volume flow rate Qv1 = the refrigerant gas constant Rg * the theoretical preset temperature Tg of the refrigerant / the theoretical nameplate Pg of the refrigerant; ε = the flow volume Qv / the theoretical volume flow rate Qv1.

5. The refrigerant filling amount and vacuum degree detection method according to claim 2, characterized in that, In step S82, it also includes the following steps: S821: Obtain the actual refrigerant pressure Px, Tx; S822: Calculate the refrigerant flow velocity Vx according to the Pitot - tube principle. Its measurement formula is: ； Where: V: flow velocity of the tip of the dynamic pressure volume flow sensor, m / s; K: measurement coefficient; △P is the measured pressure difference; ρ is the density of the measured medium, Kg / m 3 .

6. The refrigerant filling amount and vacuum degree detection method according to claim 2, wherein In step S83, the pipeline for calculating the actual flow volume Qv of the pipeline is the measurement section, and the diameter of the measurement section is constant and the cross - section does not change.

7. The refrigerant filling amount and vacuum degree detection method according to claim 1, characterized in that Before step S1, it also includes the following steps: S01: The air conditioner unit starts and operates normally; S02: Obtain the actual power parameter Px and the actual cooling and heating capacity parameter Wx; S03: When Px > preset P*C or when Wx < preset W*D, enter S1; otherwise, enter S13; Wherein, C ≤ A and D ≥ B.

8. A refrigerant filling amount and vacuum degree detection device, characterized in that, For implementing the refrigerant filling amount and vacuum degree detection method according to any one of claims 1 to 7, including: A detection module, configured to detect and obtain the power parameter and heating and cooling capacity parameter of the air conditioner unit during operation; A vacuum detection device (3), which is connected in parallel to the refrigerant pipeline between the throttling device (1) and the condensing device (4), and can switch the state of the refrigerant flowing into the vacuum detection device (3) through the first one-way valve (2) and the second one-way valve (8), and is capable of obtaining the refrigerant pipeline vacuum degree H of the air conditioner unit; A refrigerant detection device (5), which is arranged between the condensing device (4) and the compressor (6), is used to detect and calculate the actual flow volume Qv of the pipeline, and calculate the relative error coefficient ε of the refrigerant volume flow; A display module, configured to display the refrigerant pipeline vacuum degree H and the relative error coefficient ε of the refrigerant volume flow of the air conditioner unit; When the operating power Px of the air conditioner unit is greater than the preset P*C or the actual heating and cooling capacity parameter Wx is less than the preset W*D, without disassembling the machine, the stable average power parameter Px1 and the stable average heating and cooling capacity parameter Wx1 are obtained again through the detection module, and it is detected and displayed whether the refrigerant pipeline vacuum degree H and the relative error coefficient ε of the refrigerant volume flow of the air conditioner unit meet the preset requirements for normal operation. When the preset requirements are not met, continue to evacuate or refill the refrigerant filling amount for the second time.

9. An air conditioner, characterized in that, For implementing the refrigerant filling amount and vacuum degree detection method according to any one of claims 1 to 7, including an evaporation device (7) and a condensing device (4). Under the refrigeration condition, the refrigerant in the evaporation device (7) flows through the compressor (6) and the refrigerant detection device (5) to the condensing device (4). A vacuum detection device (3) is connected in parallel to the refrigerant pipeline between the condensing device (4) and the throttling device (1). The pipeline where the vacuum detection device (3) is arranged is connected in series with a second one-way valve (8). When the vacuum detection device (3) is in the startup state, the refrigerant in the condensing device (4) flows through the second one-way valve (8) and the vacuum detection device (3) to the throttling device (1). When the vacuum detection device (3) is in the closed state, the refrigerant in the condensing device (4) flows through the first one-way valve (2) to the throttling device (1).

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