A control method for preventing misconnection and reverse connection of dual compressors in a multi-connected outdoor unit and a multi-connected air conditioner system

Abstract

The present invention provides a control method for preventing misconnection and reverse connection of dual compressors in a multi-connected outdoor unit and a multi-connected air conditioner system. The control method is as follows: S1. The multi-connected outdoor unit is powered on; S2. The multi-connected outdoor unit conducts a check of the drive board model, and determines whether the drive board model check is passed. If so, step S3 is entered; if not, step S6 is entered; S3. The multi-connected outdoor unit conducts a check of the drive-compressor wiring, and determines whether the drive-compressor wiring check is passed. If so, step S4 is entered; if not, step S6 is entered; S4. The multi-connected outdoor unit conducts a check of the compressor position, and determines whether the compressor position check is passed. If so, step S5 is entered; if not, step S6 is entered; S5. The installation of the dual compressors in the multi-connected outdoor unit is normal; S6. The installation of the dual compressors in the multi-connected outdoor unit is misconnected or reversed. The control method for preventing misconnection and reverse connection of dual compressors in the multi-connected outdoor unit according to the present invention can perform three-level checks through a program, can pre-identify assembly errors and protect the unit from shutting down, and can avoid damage to components.

Description

Technical Field

[0001] The present invention relates to the field of air conditioners, and more particularly, to a control method for preventing misconnection and reverse installation of dual compressors in a multi-connected outdoor unit and a multi-connected air conditioner system. Background Art

[0002] In a dual-compressor system of a multi-connected air conditioner outdoor unit, for some models, considering economic factors, two different types of compressors are used (see the schematic diagram in the attached drawings). For example, two compressors with different displacements of 70 and 45 are connected in parallel, and the drive boards for different compressors are different. Considering generality, the different compressors, their drive board installation methods, and installation dimensions are the same. During the production process, situations may occur where the drive board is installed in the reverse position, the wiring between the drive board and the compressor is reversed, or the compressor is installed in the reverse position. When such reverse installation occurs during production or after-sales maintenance, the whole machine will not operate normally and may even cause damage to the machine. Currently, to prevent reverse installation, each manufacturer generally relies on manual control, which has an uncontrolled risk.

[0003] In view of this, the present invention is specifically proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a control method for preventing misconnection and reverse installation of dual compressors in a multi-connected outdoor unit and a multi-connected air conditioner system, so as to solve the problems in the prior art that in a dual-compressor system of a multi-connected air conditioner outdoor unit, during the production process and after-sales maintenance, situations may occur where the drive board is installed in the reverse position, the wiring between the drive board and the compressor is reversed, or the compressor is installed in the reverse position, resulting in the whole machine being unable to operate normally and even causing damage to the machine.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows:

[0006] A control method for preventing misconnection and reverse installation of dual compressors in a multi-connected outdoor unit, the control method for preventing misconnection and reverse installation of dual compressors in a multi-connected outdoor unit includes the following steps:

[0007] S1. Power on the multi-connected outdoor unit;

[0008] S2. Check the model of the drive board of the multi-connected outdoor unit, and determine whether the drive board model check is passed. If so, go to step S3; if not, go to step S6;

[0009] S3. Check the wiring between the drive and the compressor of the multi-connected outdoor unit, and determine whether the drive-compressor wiring check is passed. If so, go to step S4; if not, go to step S6;

[0010] S4. Check the position of the compressor of the multi-connected outdoor unit, and determine whether the compressor position check is passed. If so, go to step S5; if not, go to step S6;

[0011] S5. The installation of the dual compressors in the multi-connected outdoor unit is normal;

[0012] S6. The dual compressors of the multi-connected outdoor unit are installed incorrectly or in reverse.

[0013] For the control method for preventing incorrect or reverse installation of the dual compressors of the multi-connected outdoor unit according to the present invention, steps S1 to S6 are interrelated and inseparable. Through the operation of steps S1 to S6, the program of the multi-connected outdoor unit can automatically perform three-level checks, namely, the drive board model check in step S2, the drive-compressor wiring check in step S3, and the compressor position check in step S4, enabling the multi-connected outdoor unit to pre-identify assembly errors accurately in advance, thereby being able to pre-identify risks and protect the unit from shutting down, and further avoiding component damage caused by abnormal operation of the machine after reverse installation.

[0014] Further, step S2 includes the following steps:

[0015] S21. The main control board obtains the model information sent by the first drive board and the second drive board;

[0016] S22. The main control board determines whether the preset first drive board model information is consistent with the model information sent by the first drive board. If so, it proceeds to step S23; if not, it proceeds to step S6;

[0017] S23. The main control board determines whether the preset second drive board model information is consistent with the model information sent by the second drive board. If so, it proceeds to step S3; if not, it proceeds to step S6.

[0018] Steps S21 to S23 are interrelated and inseparable. By detecting and determining whether the preset first drive board model information is consistent with the model information sent by the first drive board in step S22, it is convenient to determine whether the first drive board is installed in reverse; by detecting and determining whether the preset second drive board model information is consistent with the model information sent by the second drive board in step S23, it is convenient to determine whether the second drive board is installed in reverse; if the preset first drive board model information is consistent with the model information sent by the first drive board, it indicates that the check passes and the position of the first drive board is not installed in reverse; if the preset first drive board model information is inconsistent with the model information sent by the first drive board, it indicates that the drive board model check fails and the first drive board is installed in reverse, and it proceeds to step S6 for incorrect or reverse installation of the dual compressors of the multi-connected outdoor unit, and the main control board reports a drive board matching failure; if the preset second drive board model information is consistent with the model information sent by the second drive board, it indicates that the check passes and the position of the second drive board is not installed in reverse; if the preset second drive board model information is inconsistent with the model information sent by the second drive board, it indicates that the drive board model check fails and the second drive board is installed in reverse, and it proceeds to step S6 for incorrect or reverse installation of the dual compressors of the multi-connected outdoor unit, and the main control board reports a drive board matching failure.

[0019] Further, step S2 includes the following steps:

[0020] S21. The main control board obtains the model information sent by the first drive board and the second drive board;

[0021] S22. The main control board determines whether the preset second drive board model information is consistent with the model information sent by the second drive board. If so, it enters step S23; if not, it enters step S6;

[0022] S23. The main control board determines whether the preset first drive board model information is consistent with the model information sent by the first drive board. If so, it enters step S3; if not, it enters step S6.

[0023] Steps S21 - S23 are interrelated and inseparable. By step S22, it is detected and judged whether the preset second drive board model information is consistent with the model information sent by the second drive board, which is convenient for judging whether the second drive board is installed reversely; by step S23, it is detected and judged whether the preset first drive board model information is consistent with the model information sent by the first drive board, which is convenient for judging whether the first drive board is installed reversely; if the preset first drive board model information is consistent with the model information sent by the first drive board, it indicates that the verification is passed and the position of the first drive board is not installed reversely; if the preset first drive board model information is inconsistent with the model information sent by the first drive board, it indicates that the drive board model verification fails, the position of the first drive board is installed reversely, and it enters step S6 where the multi-connected outdoor unit with double compressors is installed wrongly and reversely, and the main control board reports a drive board matching fault; if the preset second drive board model information is consistent with the model information sent by the second drive board, it indicates that the verification is passed and the position of the second drive board is not installed reversely; if the preset second drive board model information is inconsistent with the model information sent by the second drive board, it indicates that the drive board model verification fails, the position of the second drive board is installed reversely, and it enters step S6 where the multi-connected outdoor unit with double compressors is installed wrongly and reversely, and the main control board reports a drive board matching fault.

[0024] Further, step S3 includes the following steps:

[0025] S31. The main control board obtains the exhaust temperature T of the compressor installed on the left 左排气0 and the exhaust temperature T of the compressor installed on the right 右排气0 ;

[0026] S32. Start the first compressor. The correct installation position of the first compressor is on the left, and the second compressor remains in the stopped state;

[0027] S33. After the first compressor starts and runs for time t1, the main control board obtains the exhaust temperature T of the compressor installed on the left 左排气1 and the exhaust temperature T of the compressor installed on the right 右排气1 ;

[0028] S34. The main control board determines whether T 左排气1 < T 左排气0+A or T 右排气1 >T 右排气0 +B, where A is the first preset constant and B is the second preset constant. If so, go to step S6; if not, go to step S4.

[0029] Steps S31 to S34 are interrelated and inseparable. Through steps S31 to S34, the exhaust temperature T of the compressor installed on the left side, 左排气0 the exhaust temperature T of the compressor installed on the right side, 右排气0 the exhaust temperature T of the compressor installed on the left side after the first compressor has started running for time t1, 左排气1 the exhaust temperature T of the compressor installed on the right side, 右排气1 is detected, so as to judge whether T 左排气1 <T 左排气0 +A or T 右排气1 >T 右排气0 +B. If T 左排气1 <T 左排气0 +A, it indicates that after the first compressor starts, the exhaust temperature of the compressor installed on the left side has no obvious change, which means that the drive-compressor wiring check fails and the drive-compressor wiring is incorrect. Go to step S6 for misinstallation or reverse installation of the dual compressors of the multi-connected outdoor unit, and the main control board reports a drive-compressor wiring fault; if T 右排气1 >T 右排气0 +B, it indicates that after the first compressor starts, the exhaust temperature of the compressor installed on the right side has a significant increase, which means that the drive-compressor wiring check fails and the drive-compressor wiring is incorrect. Go to step S6 for misinstallation or reverse installation of the dual compressors of the multi-connected outdoor unit, and the main control board reports a drive-compressor wiring fault.

[0030] Furthermore, step S3 includes the following steps:

[0031] S31. The main control board obtains the exhaust temperature T of the compressor installed on the left side, 左排气0 the exhaust temperature T of the compressor installed on the right side; 右排气0 ;

[0032] S32. Start the second compressor. The correct installation position of the second compressor is on the right side, and the first compressor remains in the stopped state;

[0033] S33. After the second compressor has started running for time t1, the main control board obtains the exhaust temperature T of the compressor installed on the left side, 左排气2 the exhaust temperature T of the compressor installed on the right side; 右排气2 ;

[0034] S34. The main control board judges whether T 右排气2 <T 右排气0 +A or T 左排气2 >T 左排气0+B, where A is the first preset constant and B is the second preset constant. If so, go to step S6; if not, go to step S4.

[0035] Steps S31 to S34 are interrelated and inseparable. Through steps S31 to S34, the exhaust temperature T of the compressor installed on the left 左排气0 and the exhaust temperature T of the compressor installed on the right 右排气0 , the exhaust temperature T of the compressor installed on the left after the second compressor has started running for time t1 左排气2 and the exhaust temperature T of the compressor installed on the right 右排气2 are detected, so as to judge whether T 右排气2 <T 右排气0 +A or T 左排气2 >T 左排气0 +B through step S34. If T 右排气2 <T 右排气0 +A, it indicates that after the second compressor starts, the exhaust temperature of the compressor installed on the right does not change significantly, which means that the drive-compressor wiring check fails and the drive-compressor wiring is incorrect. Go to step S6 for the multi-connected outdoor unit with dual compressors installed wrongly in reverse, and the main control board reports a drive-compressor wiring fault; if T 左排气2 >T 左排气0 +B, it indicates that after the second compressor starts, the exhaust temperature of the compressor installed on the left has increased significantly, which means that the drive-compressor wiring check fails and the drive-compressor wiring is incorrect. Go to step S6 for the multi-connected outdoor unit with dual compressors installed wrongly in reverse, and the main control board reports a drive-compressor wiring fault.

[0036] Furthermore, step S4 includes the following steps:

[0037] S41. Start the first compressor and the second compressor simultaneously;

[0038] S42. The main control board obtains the currents I 第一压缩机 、I 第二压缩机 of the dual compressors, the suction pressure, and the discharge pressure in real time. Both the first compressor and the second compressor are increased to frequency f and maintained for time t2;

[0039] S43. The main control board obtains the preset first compressor coefficient, the preset second compressor coefficient, the current suction saturation temperature Tev, and the discharge saturation temperature Tcd.

[0040] S44. Calculate the current theoretical current value I 第一压缩机理论 of the first compressor and the current theoretical current value I 第二压缩机理论 of the second compressor;

[0041] S45. Judge whether I 第一压缩机理论 *C ≤ I 第一压缩机 ≤ I第一压缩机理论 *D, where C is the first preset coefficient and D is the second preset coefficient. If so, proceed to step S46; if not, proceed to step S6.

[0042] S46. Determine whether I 第二压缩机理论 *C ≤ I 第二压缩机 ≤ I 第二压缩机理论 *D. If so, proceed to step S5; if not, proceed to step S6.

[0043] Steps S41 to S46 are interrelated and inseparable. Through steps S41 to S44, the current I of the first compressor 第一压缩机 , the current I of the second compressor 第二压缩机 , the first compressor, and the second compressor are all frequency - increased to frequency f and maintained for t2 time, and then the current theoretical current value I of the first compressor 第一压缩机理论 , the current theoretical current value I of the second compressor 第二压缩机理论 are detected and calculated, so as to determine whether I 第一压缩机理论

[0044] *C ≤ I 第一压缩机 ≤ I 第一压缩机理论 *D. When I 第一压缩机理论 *C ≤ I 第一压缩机 ≤ I 第一压缩机理论 *D, it indicates that the first compressor is matched with the drive and the position of the first compressor is not installed backwards; otherwise, it indicates that the compressor position check fails, the first compressor is mismatched with the drive, the position of the first compressor is installed backwards, and proceed to step S6. If the multi - connected outdoor unit has a double - compressor installation error, the main control board reports a compressor matching fault. Determine whether I 第二压缩机理论 *C ≤ I 第二压缩机 ≤ I 第二压缩机理论 *D. When I 第二压缩机理论 *C ≤ I 第二压缩机 ≤ I 第二压缩机理论 *D, it indicates that the second compressor is matched with the drive and the position of the second compressor is not installed backwards; otherwise, it indicates that the compressor position check fails, the second compressor is mismatched with the drive, the position of the second compressor is installed backwards, and proceed to step S6. If the multi - connected outdoor unit has a double - compressor installation error, the main control board reports a compressor matching fault.

[0045] Furthermore, step S4 includes the following steps:

[0046] S41. Start the first compressor and the second compressor simultaneously;

[0047] S42. The main control board obtains the currents I of the double compressors in real - time 第一压缩机 , I 第二压缩机 , the suction pressure, the discharge pressure, and the first compressor and the second compressor are both frequency - increased to frequency f and maintained for t2 time;

[0048] S43. The main control board obtains the preset first compressor coefficient and the preset second compressor coefficient, and obtains the current suction saturation temperature Tev and the discharge saturation temperature Tcd.

[0049] S44. Calculate the current theoretical current value I of the first compressor 第一压缩机理论 and the current theoretical current value I of the second compressor 第二压缩机理论 ;

[0050] S45. Determine whether I 第二压缩机理论 * C ≤ I 第二压缩机 ≤ I 第二压缩机理论 ≤ I * D, where C is the first preset coefficient and D is the second preset coefficient. If so, go to step S46; if not, go to step S6.

[0051] S46. Determine whether I 第一压缩机理论 * C ≤ I 第一压缩机 ≤ I 第一压缩机理论 ≤ I * D. If so, go to step S5; if not, go to step S6.

[0052] Steps S41 to S46 are interrelated and inseparable. Through steps S41 to S44, the current I of the first compressor 第一压缩机 and the current I of the second compressor 第二压缩机 , the first compressor and the second compressor are both up - frequencyed to the frequency f and maintained for t2 time, and then the current theoretical current value I of the first compressor 第一压缩机理论 and the current theoretical current value I of the second compressor 第二压缩机理论 are detected and calculated, so as to determine whether I 第二压缩机理论

[0053] * C ≤ I 第二压缩机 ≤ I 第二压缩机理论 ≤ I * D. When I 第二压缩机理论 * C ≤ I 第二压缩机 ≤ I 第二压缩机理论 ≤ I * D, it indicates that the second compressor is matched with the drive and the position of the second compressor is not installed backwards; otherwise, it indicates that the compressor position check fails, the second compressor is mismatched with the drive, the position of the second compressor is installed backwards, and go to step S6. If the multi - connected outdoor unit with double compressors is installed wrongly, the main control board reports a compressor matching fault; so as to determine whether I 第一压缩机理论 * C ≤ I 第一压缩机 ≤ I 第一压缩机理论 ≤ I * D. When I 第一压缩机理论 * C ≤ I 第一压缩机 ≤ I 第一压缩机理论When it is *D, it indicates that the matching between the first compressor and the drive is passed, and the position of the first compressor is not installed in reverse; otherwise, it indicates that the position check of the compressor fails, the matching between the first compressor and the drive is incorrect, the position of the first compressor is installed in reverse, and enter step S6 where the multi-connected outdoor unit with dual compressors is installed incorrectly or in reverse, then the main control board reports a compressor matching fault.

[0054] Further, in step S44, the current theoretical current value I of the first compressor 第一压缩机理论 and the current theoretical current value I of the second compressor 第二压缩机理论 are calculated as follows:

[0055] I 第一压缩机理论 = A0 + A1Tev + A2Tcd + A3Tev 2 + A4TevTcd + A5Tcd 2 + A6Tev 3 + A7TcdTev 2 + A8TevTcd 2 + A9Tcd 3 ,

[0056] where A0 to A9 are the ten coefficients corresponding to the first compressor at frequency f;

[0057] I 第二压缩机理论 = B0 + B1Tev + B2Tcd + B3Tev 2 + B4TevTcd + B5Tcd 2 + B6Tev 3 +

[0058] B7TcdTev 2 + B8TevTcd 2 + B9Tcd 3 ,

[0059] where B0 to B9 are the ten coefficients corresponding to the second compressor at frequency f.

[0060] Further, in step S6, if the drive board model check fails, the main control board reports a drive board matching fault; if the drive-compressor wiring check fails, the main control board reports a drive-compressor wiring fault; if the compressor position check fails, the main control board reports a compressor matching fault.

[0061] This setting is convenient for reminding users or maintenance staff of the specific type of fault in the incorrect or reverse installation of the multi-connected outdoor unit with dual compressors, facilitating repair according to different fault situations and improving work efficiency.

[0062] In a second aspect of the present invention, a multi-connected air conditioner system is provided. The multi-connected air conditioner system includes an outdoor unit and indoor units. The outdoor unit includes a first compressor and a second compressor. The outdoor unit uses any one of the control methods for preventing misconnection and reverse connection of the dual compressors of the multi-connected outdoor unit.

[0063] The outdoor unit of the multi-connected air conditioner system includes a main control board, a first drive board, a second drive board, a first compressor, and a second compressor. One end of the first drive board is connected to the main control board, and the other end of the first drive board is connected to the first compressor; one end of the second drive board is connected to the main control board, and the other end of the second drive board is connected to the second compressor. The first drive board and the first compressor are installed on one side inside the outdoor unit of the multi-connected air conditioner system, and the second drive board and the second compressor are installed on the other side inside the outdoor unit, which is opposite to the side where the first drive board and the first compressor are installed.

[0064] Compared with the prior art, the control method for preventing misconnection and reverse connection of the dual compressors of the multi-connected outdoor unit and the multi-connected air conditioner system of the present invention have the following beneficial effects:

[0065] For the control method for preventing misconnection and reverse connection of the dual compressors of the multi-connected outdoor unit and the multi-connected air conditioner system of the present invention, steps S1 to S6 are interrelated and inseparable. Through the operation of steps S1 to S6, the program of the outdoor unit of the multi-connected air conditioner system can automatically perform the verification of the drive board model in step S2, the verification of the drive-compressor wiring in step S3, and the verification of the compressor position in step S4. There are a total of three levels of verification, enabling the outdoor unit of the multi-connected air conditioner system to identify assembly errors in advance and more accurately, thereby being able to identify risks in advance and protect the shutdown, and further being able to avoid component damage caused by abnormal operation of the machine after reverse installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 It is a schematic flow chart of a control method for preventing misconnection and reverse connection of dual compressors of a multi-connected outdoor unit according to an embodiment of the present invention;

[0067] Figure 2 It is one of the schematic structural diagrams of a multi-connected outdoor unit according to an embodiment of the present invention;

[0068] Figure 3 It is another schematic structural diagram of a multi-connected outdoor unit according to an embodiment of the present invention.

[0069] DESCRIPTION OF THE REFERENCE NUMERALS

[0070] 1, main control board; 21, first drive board; 22, second drive board; 31, first compressor; 32, second compressor; 41, left compressor discharge temperature sensor; 42, right compressor discharge temperature sensor; 51, first oil separator; 52, second oil separator; 61, first gas separator; 62, second gas separator; 71, first injection enthalpy valve; 72, second injection enthalpy valve; 8, four-way valve; 9, fin heat exchanger. Specific Embodiments

[0071] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. In the embodiments of the present invention, the descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0072] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0073] A multi-connected air-conditioning system, the multi-connected air-conditioning system includes an outdoor unit for multi-connected units and indoor units for multi-connected units. The outdoor unit for multi-connected units uses a control method for preventing misconnection and reverse connection of double compressors in the outdoor unit for multi-connected units, as Figures 2 to 3 shown, in the outdoor unit for multi-connected units, there are a main control board 1, a first drive board 21, a second drive board 22, a first compressor 31, and a second compressor 32. One end of the first drive board 21 is connected to the main control board 1, and the other end of the first drive board 21 is connected to the first compressor 31; one end of the second drive board 22 is connected to the main control board 1, and the other end of the second drive board 22 is connected to the second compressor 32. The first drive board 21 and the first compressor 31 are installed on one side inside the outdoor unit for multi-connected units, and the second drive board 22 and the second compressor 32 are installed on the other side inside the outdoor unit for multi-connected units, which is opposite to the side where the first drive board 21 and the first compressor 31 are located.

[0074] As Figure 3 shown, the outdoor unit for multi-connected units further includes a first oil separator 51; a second oil separator 52, a first gas separator 61, a second gas separator 62, a first injection enthalpy valve 71, a second injection enthalpy valve 72, a four-way valve 8, and a fin heat exchanger 9.

[0075] As Figure 1 shown, the control method for preventing misconnection and reverse connection of double compressors in the outdoor unit for multi-connected units includes the following steps:

[0076] S1. The outdoor unit for multi-connected units is powered on;

[0077] S2. The outdoor unit for multi-connected units conducts a drive board model check. Determine whether the drive board model check is passed. If so, proceed to step S3; if not, proceed to step S6;

[0078] S3. The outdoor unit for multi-connected units conducts a drive-compressor wiring check. Determine whether the drive-compressor wiring check is passed. If so, proceed to step S4; if not, proceed to step S6;

[0079] S4. The multi-connected outdoor unit performs compressor position verification. Determine whether the compressor position verification is passed. If it is, proceed to step S5; if not, proceed to step S6.

[0080] S5. The dual compressors of the multi-connected outdoor unit are installed normally.

[0081] S6. The dual compressors of the multi-connected outdoor unit are installed incorrectly in reverse.

[0082] The control method for preventing misassembly in reverse of the dual compressors of the multi-connected outdoor unit according to the present invention lists all possible misassembled situations and their combinations for the multi-connected outdoor unit with dual compressors, summarizes the differences in inspection and verification factors after different assembly method combinations. Steps S1 to S6 are interrelated and inseparable. Through the operation of steps S1 to S6, the program of the multi-connected outdoor unit can automatically perform the drive board model verification in step S2, the drive-compressor wiring verification in step S3, and the compressor position verification in step S4, a total of three levels of verification, enabling the multi-connected outdoor unit to pre-identify assembly errors accurately, thereby being able to pre-identify risks and protect the shutdown, and further being able to avoid device damage caused by abnormal operation of the machine after misassembly in reverse.

[0083] Embodiment 1

[0084] In this embodiment, as Figure 2 shown, the correct assembly method is:

[0085] (1) Drive board position: The first drive board 21 is installed on the left side, and the second drive board 22 is installed on the right side.

[0086] (2) Drive-compressor wiring: The first drive board 21 on the left side is connected to the first compressor 31 on the left side by wiring, and the second drive board 22 on the right side is connected to the second compressor 32 on the right side by wiring.

[0087] (3) Compressor position: The first compressor 31 is installed on the left side, and the second compressor 32 is installed on the right side.

[0088] This embodiment proposes a control method for preventing misassembly in reverse of the dual compressors of a multi-connected air conditioner, as Figure 2 and Figure 3As shown in the figure, the outdoor unit of the multi-connected air conditioner includes a main control board 1, a first drive board 21, a second drive board 22, a first compressor 31, and a second compressor 32. The first drive board 21 and the first compressor 31 are installed on the left side inside the outdoor unit of the multi-connected air conditioner, and the second drive board 22 and the second compressor 32 are installed on the right side inside the outdoor unit of the multi-connected air conditioner, adjacent to the right side of the first drive board 21 and the first compressor 31. One end of the first drive board 21 on the left side is connected to the main control board 1, and the other end of the first drive board 21 on the left side is connected to the first compressor 31 on the left side by wiring. One end of the second drive board 22 on the right side is connected to the main control board 1, and the other end of the second drive board 22 on the right side is connected to the second compressor 32 on the right side by wiring. A left compressor discharge temperature sensor 41 is provided on the first compressor 31, and a right compressor discharge temperature sensor 42 is provided on the second compressor 32;

[0089] As Figure 1 shown, the control method for preventing misinstallation and reverse installation of the double compressors of the multi-connected outdoor unit includes the following steps:

[0090] S1. Power on the multi-connected outdoor unit;

[0091] S2. Check the model of the drive board of the multi-connected outdoor unit to determine whether the drive board model check is passed. If so, go to step S3; if not, go to step S6;

[0092] S3. Check the wiring between the drive and the compressor of the multi-connected outdoor unit to determine whether the drive-compressor wiring check is passed. If so, go to step S4; if not, go to step S6;

[0093] S4. Check the position of the compressor of the multi-connected outdoor unit to determine whether the compressor position check is passed. If so, go to step S5; if not, go to step S6;

[0094] S5. The installation of the double compressors of the multi-connected outdoor unit is normal;

[0095] S6. The installation of the double compressors of the multi-connected outdoor unit is misinstalled or reversed.

[0096] For the control method for preventing misinstallation and reverse installation of the double compressors of the multi-connected outdoor unit in this embodiment, for the multi-connected outdoor unit with double compressors, all possible misinstallations and their combinations are listed, and the differences in the inspection and verification factors after different assembly method combinations are summarized. Steps S1 to S6 are interrelated and inseparable. Through the operation of steps S1 to S6, the program of the multi-connected outdoor unit can automatically perform the drive board model check in step S2, the drive-compressor wiring check in step S3, and the compressor position check in step S4, a total of three levels of checks, enabling the multi-connected outdoor unit to identify assembly errors in advance and more accurately, so as to identify risks in advance and protect the unit from shutting down, and further avoid device damage caused by abnormal operation of the machine after misinstallation.

[0097] Specifically, step S2 includes the following steps:

[0098] S21. The main control board 1 obtains the model information sent by the first drive board 21 and the second drive board 22;

[0099] S22. The main control board 1 determines whether the preset model information of the first drive board 21 is consistent with the model information sent by the first drive board 21. If so, it proceeds to step S23; if not, it proceeds to step S6;

[0100] S23. The main control board 1 determines whether the preset model information of the second drive board 22 is consistent with the model information sent by the second drive board 22. If so, it proceeds to step S3; if not, it proceeds to step S6.

[0101] Steps S21 to S23 are interrelated and inseparable. By step S22, it is detected and determined whether the preset model information of the first drive board 21 is consistent with the model information sent by the first drive board 21, which is convenient for judging whether the first drive board 21 is installed in reverse; by step S23, it is detected and determined whether the preset model information of the second drive board 22 is consistent with the model information sent by the second drive board 22, which is convenient for judging whether the second drive board 22 is installed in reverse; if the preset model information of the first drive board 21 is consistent with the model information sent by the first drive board 21, it indicates that the verification is passed and the position of the first drive board 21 is not installed in reverse; if the preset model information of the first drive board 21 is inconsistent with the model information sent by the first drive board 21, it indicates that the verification fails and the position of the first drive board 21 is installed in reverse. Then it proceeds to step S6 where the multi-connected outdoor unit's dual compressors are installed incorrectly or in reverse, and the main control board 1 reports a drive board matching failure; if the preset model information of the second drive board 22 is consistent with the model information sent by the second drive board 22, it indicates that the verification is passed and the position of the second drive board 22 is not installed in reverse; if the preset model information of the second drive board 22 is inconsistent with the model information sent by the second drive board 22, it indicates that the verification fails and the position of the second drive board 22 is installed in reverse. Then it proceeds to step S6 where the multi-connected outdoor unit's dual compressors are installed incorrectly or in reverse, and the main control board 1 reports a drive board matching failure.

[0102] Or, step S2 includes the following steps:

[0103] S21. The main control board 1 obtains the model information sent by the first drive board 21 and the second drive board 22;

[0104] S22. The main control board 1 determines whether the preset model information of the second drive board 22 is consistent with the model information sent by the second drive board 22. If so, it proceeds to step S23; if not, it proceeds to step S6;

[0105] S23. The main control board 1 determines whether the preset model information of the first drive board 21 is consistent with the model information sent by the first drive board 21. If so, it proceeds to step S3; if not, it proceeds to step S6.

[0106] Steps S21 - S23 are interrelated and inseparable. By detecting and judging in step S22 whether the preset model information of the second drive board 22 is consistent with the model information sent by the second drive board 22, it is convenient to judge whether the second drive board 22 is installed backwards; by detecting and judging in step S23 whether the preset model information of the first drive board 21 is consistent with the model information sent by the first drive board 21, it is convenient to judge whether the first drive board 21 is installed backwards; if the preset model information of the first drive board 21 is consistent with the model information sent by the first drive board 21, it indicates that the verification is passed and the position of the first drive board 21 is not installed backwards; if the preset model information of the first drive board 21 is inconsistent with the model information sent by the first drive board 21, it indicates that the verification fails and the position of the first drive board 21 is installed backwards, and then enter step S6 where the multi-connected outdoor unit's dual compressors are installed wrongly or backwards, and the main control board 1 reports a drive board matching fault; if the preset model information of the second drive board 22 is consistent with the model information sent by the second drive board 22, it indicates that the verification is passed and the position of the second drive board 22 is not installed backwards; if the preset model information of the second drive board 22 is inconsistent with the model information sent by the second drive board 22, it indicates that the verification fails and the position of the second drive board 22 is installed backwards, and then enter step S6 where the multi-connected outdoor unit's dual compressors are installed wrongly or backwards, and the main control board 1 reports a drive board matching fault.

[0107] Specifically, step S3 includes the following steps:

[0108] S31. The main control board 1 obtains the exhaust temperature T of the compressor installed on the left 左排气0 and the exhaust temperature T of the compressor installed on the right 右排气0 .

[0109] S32. Start the first compressor 31. The correct installation position of the first compressor 31 is on the left, and the second compressor 32 remains in the stopped state.

[0110] S33. After the first compressor 31 starts and runs for a time t1, the main control board 1 obtains the exhaust temperature T of the compressor installed on the left 左排气1 and the exhaust temperature T of the compressor installed on the right 右排气1 .

[0111] S34. The main control board 1 judges whether T 左排气1 < T 左排气0 + A or T 右排气1 > T 右排气0 + B, where A is the first preset constant and B is the second preset constant. If so, enter step S6; if not, enter step S4.

[0112] Steps S31 - S34 are interrelated and inseparable. By steps S31 - S34, for the exhaust temperature T of the compressor installed on the left 左排气0, the exhaust gas temperature T of the compressor installed on the right 右排气0 , the exhaust gas temperature T of the compressor installed on the left after the first compressor 31 starts running for time t1 左排气1 , the exhaust gas temperature T of the compressor installed on the right 右排气1 is detected to facilitate determining whether T 左排气1 < T 左排气0 + A or T 右排气1 > T 右排气0 + B. If T 左排气1 < T 左排气0 + A, it indicates that after the first compressor 31 starts, the exhaust gas temperature of the compressor installed on the left has no obvious change, which means the drive-compressor wiring is incorrect. Then enter step S6 for the wrong installation of the dual compressors in the multi-connected outdoor unit, and the main control board 1 reports a drive-compressor wiring fault; if T 右排气1 > T 右排气0 + B, it indicates that after the first compressor 31 starts, the exhaust gas temperature of the compressor installed on the right has a significant increase, which means the drive-compressor wiring is incorrect. Then enter step S6 for the wrong installation of the dual compressors in the multi-connected outdoor unit, and the main control board 1 reports a drive-compressor wiring fault;.

[0113] Or, step S3 includes the following steps:

[0114] S31, the main control board 1 obtains the exhaust gas temperature T of the compressor installed on the left 左排气0 , the exhaust gas temperature T of the compressor installed on the right 右排气0 ;

[0115] S32, start the second compressor 32. The correct installation position of the second compressor 32 is on the right, and the first compressor 31 remains in the stopped state;

[0116] S33, after the second compressor 32 starts running for time t1, the main control board 1 obtains the exhaust gas temperature T of the compressor installed on the left 左排气2 , the exhaust gas temperature T of the compressor installed on the right 右排气2 ;

[0117] S34, the main control board 1 determines whether T 右排气2 < T 右排气0 + A or T 左排气2 > T 左排气0 + B, where A is the first preset constant and B is the second preset constant. If so, enter step S6; if not, enter step S4.

[0118] Steps S31 to S34 are interrelated and inseparable. Through steps S31 to S34, the exhaust gas temperature T of the compressor installed on the left 左排气0 , the exhaust gas temperature T of the compressor installed on the right 右排气0, the exhaust gas temperature T of the compressor installed on the left after the second compressor 32 starts running for time t1 左排气2 , the exhaust gas temperature T of the compressor installed on the right 右排气2 is detected to facilitate determining whether T 右排气2 < T 右排气0 + A or T 左排气2 > T 左排气0 + B. If T 右排气2 < T 右排气0 + A, it indicates that after the second compressor 32 starts, the exhaust gas temperature of the compressor installed on the right has no obvious change, which means that the drive-compressor wiring is incorrect. Then enter step S6 for the wrong installation of the dual compressors of the multi-connected outdoor unit, and the main control board 1 reports a drive-compressor wiring fault; if T 左排气2 > T 左排气0 + B, it indicates that after the second compressor 32 starts, the exhaust gas temperature of the compressor installed on the left has a significant increase, which means that the drive-compressor wiring is incorrect. Then enter step S6 for the wrong installation of the dual compressors of the multi-connected outdoor unit, and the main control board 1 reports a drive-compressor wiring fault.

[0119] Among them, the exhaust gas temperature of the compressor installed on the left is obtained through the left compressor exhaust gas temperature sensor 41, and the exhaust gas temperature of the compressor installed on the right is obtained through the right compressor exhaust gas temperature sensor 42.

[0120] Among them, the value ranges of t1, A, and B are not specifically limited. A is the first preset constant, B is the second preset constant, and A and B are stored in the main control board 1 in advance.

[0121] Specifically, the value range of t1 is 2 - 5 min, and t1 can take any value within 2 - 5 min; the value of t1 can be 2 min, the value of t1 can also be 3 min, and the value of t1 can also be 5 min;

[0122] The value range of A is 2 - 5; the first preset constant A can take any value within 2 - 5; the value of A can be 2, the value of A can be 3, the value of A can also be 5, and the value of A can also be 5;

[0123] The value range of B is 3 - 8, and the second preset constant B can take any value within 3 - 8; the value of B can be 3, the value of B can also be 5, and the value of B can also be 8.

[0124] More specifically, in this embodiment, the value of t1 is 3 min, the value range of A is 3; the value range of B is 5.

[0125] Specifically, step S4 includes the following steps:

[0126] S41. Start the first compressor 31 and the second compressor 32 simultaneously;

[0127] S42. The main control board 1 obtains the currents I of the two compressors in real time 第一压缩机 、I 第二压缩机 、the suction pressure, the discharge pressure, and both the first compressor 31 and the second compressor 32 are increased to the frequency f and maintained for the time t2;

[0128] S43. The main control board 1 obtains the preset coefficient of the first compressor 31, the preset coefficient of the second compressor 32, obtains the current suction saturation temperature Tev, and the discharge saturation temperature Tcd,

[0129] S44. Calculate the current theoretical current value I of the first compressor 31 第一压缩机理论 、the current theoretical current value I of the second compressor 32 第二压缩机理论 ;

[0130] S45. Judge whether I 第一压缩机理论 *C ≤ I 第一压缩机 ≤ I 第一压缩机理论 *D, where C is the first preset coefficient and D is the second preset coefficient. If so, go to step S46; if not, go to step S6,

[0131] S46. Judge whether I 第二压缩机理论 *C ≤ I 第二压缩机 ≤ I 第二压缩机理论 *D. If so, go to step S5; if not, go to step S6.

[0132] Steps S41 to S46 are interrelated and inseparable. Through steps S41 to S44, the current I of the first compressor 31 第一压缩机 、the current I of the second compressor 32 第二压缩机 、the current theoretical current value I of the first compressor 31 after both the first compressor 31 and the second compressor 32 are increased to the frequency f and maintained for the time t2 第一压缩机理论 、the current theoretical current value I of the second compressor 32 第二压缩机理论 are detected and calculated, so as to judge whether I 第一压缩机理论 *C ≤ I 第一压缩机 ≤ I 第一压缩机理论 *D through step S45. When I 第一压缩机理论 *C ≤ I 第一压缩机 ≤ I 第一压缩机理论 *D, it indicates that the matching between the first compressor 31 and the drive passes, and the position of the first compressor 31 is not installed reversely; otherwise, it indicates that the matching between the first compressor 31 and the drive is incorrect, the position of the first compressor 31 is installed reversely, and go to step S6 for the multi-connected outdoor unit with the two compressors installed wrongly or reversely, then the main control board 1 reports a compressor matching fault; judge whether I 第二压缩机理论 *C ≤ I 第二压缩机 ≤ I 第二压缩机理论 *D through step S46. When I第二压缩机理论 *C ≤ I 第二压缩机 ≤ I 第二压缩机理论 When it is *D, it indicates that the matching of the second compressor 32 with the drive is passed and the position of the second compressor 32 is not installed reversely; otherwise, it indicates that the matching of the second compressor 32 with the drive is incorrect, the position of the second compressor 32 is installed reversely, enter step S6 for the wrong or reverse installation of the dual compressors of the multi-connected outdoor unit, and the main control board 1 reports a compressor matching fault.

[0133] Or, step S4 includes the following steps:

[0134] S41. Start the first compressor 31 and the second compressor 32 simultaneously;

[0135] S42. The main control board 1 obtains the current I of the dual compressors in real time 第一压缩机 、I 第二压缩机 、the suction pressure, the discharge pressure, both the first compressor 31 and the second compressor 32 are up-regulated to the frequency f and maintained for the time t2;

[0136] S43. The main control board 1 obtains the preset coefficient of the first compressor 31, the preset coefficient of the second compressor 32, obtains the current suction saturation temperature Tev and the discharge saturation temperature Tcd,

[0137] S44. Calculate the current theoretical current value I of the first compressor 31 第一压缩机理论 、the current theoretical current value I of the second compressor 32 第二压缩机理论 ;

[0138] S45. Judge whether I 第二压缩机理论 *C ≤ I 第二压缩机 ≤ I 第二压缩机理论 *D, where C is the first preset coefficient and D is the second preset coefficient. If so, enter step S46; if not, enter step S6,

[0139] S46. Judge whether I 第一压缩机理论 *C ≤ I 第一压缩机 ≤ I 第一压缩机理论 *D. If so, enter step S5; if not, enter step S6.

[0140] Steps S41 to S46 are interrelated and inseparable. Through steps S41 to S44, the current I of the first compressor 31 第一压缩机 、the current I of the second compressor 32 第二压缩机 、the current theoretical current value I of the first compressor 31 after both the first compressor 31 and the second compressor 32 are up-regulated to the frequency f and maintained for the time t2 第一压缩机理论 、the current theoretical current value I of the second compressor 32 第二压缩机理论 are detected and calculated, so as to judge whether I 第二压缩机理论 *C ≤ I第二压缩机 ≤ I 第二压缩机理论 * D, when I 第二压缩机理论 * C ≤ I 第二压缩机 ≤ I 第二压缩机理论 * D, it indicates that the second compressor 32 is properly matched with the drive and the position of the second compressor 32 is not installed backwards; otherwise, it indicates that the second compressor 32 is mismatched with the drive and the position of the second compressor 32 is installed backwards. Enter step S6 for incorrect or reversed installation of the dual compressors in the multi-connected outdoor unit, and then the main control board 1 reports a compressor matching fault; it is convenient to determine whether I 第一压缩机理论 * C ≤ I 第一压缩机 ≤ I 第一压缩机理论 * D, when I 第一压缩机理论 * C ≤ I 第一压缩机 ≤ I 第一压缩机理论 * D, it indicates that the first compressor 31 is properly matched with the drive and the position of the first compressor 31 is not installed backwards; otherwise, it indicates that the first compressor 31 is mismatched with the drive and the position of the first compressor 31 is installed backwards. Enter step S6 for incorrect or reversed installation of the dual compressors in the multi-connected outdoor unit, and then the main control board 1 reports a compressor matching fault.

[0141] Among them, the current I of the dual compressors is detected in real time by the current detection device 第一压缩机 、I 第二压缩机 . The suction pressure of the dual compressors is detected by the suction pressure sensor, and the discharge pressure of the dual compressors is detected by the discharge pressure sensor.

[0142] The current suction saturation temperature Tev is obtained by converting the suction pressure; the discharge saturation temperature Tcd is obtained by converting the discharge pressure.

[0143] In the main control board 1, the conversion formula between the suction pressure and the suction saturation temperature Tev and the conversion formula between the discharge pressure and the discharge saturation temperature Tcd are stored in advance. Since both the conversion formula between the suction pressure and the suction saturation temperature Tev and the conversion formula between the discharge pressure and the discharge saturation temperature Tcd are existing technologies, they will not be elaborated here.

[0144] Among them, the coefficients of different compressors are different, and the theoretically calculated current values are also different. By comparing the measured current with the theoretically calculated current, it is judged whether the compressor is correct. The compressor ten coefficients are ten coefficients obtained by solving the test data of the compressor under specific conditions: at least ten groups of known data (according to the actual test data of the compressor) are required. Substitute the corresponding discharge saturation temperature and suction saturation temperature into the ten coefficient formula, and a system of equations can be established to obtain the ten coefficients.

[0145] The following briefly introduces the solution process of the compressor ten coefficients:

[0146] Compressor ten coefficient mathematical model:

[0147] X = C0 + C1Tev + C2Tcd + C3Tev 2 + C4TevTcd + C5Tcd 2 + C6Tev 3 + C7TcdTev 2 +

[0148] C8TevTcd 2 + C9Tcd 3 (1)

[0149] Equation (1) is a polynomial empirical model for calculating the ten coefficients of the compressor. Under standard conditions, the input power, mass flow rate, current, and energy efficiency ratio of the compressor can all be represented by this mathematical model. Among them: C0 to C9 represent ten coefficients. Tev and Tcd represent the suction saturation temperature and the discharge saturation temperature respectively, with the unit of ℉ (or °C). X can represent: input power, W (or KW); mass flow rate, Kg / s (or lbs / h); current, A; energy efficiency ratio, W / W (or Btu / (hw)). The units of each parameter in the formula depend on the units of the original data used to fit the formula.

[0150] Substituting ten sets of corresponding measured values of the discharge saturation temperature, suction saturation temperature, and X into Equation (1) can obtain the ten coefficients of the compressor.

[0151] Among them, X is the input power or mass flow rate or energy efficiency ratio of the compressor at a specific frequency f of the compressor in this embodiment.

[0152] Among them, the value ranges of the frequency f and t2 are not specifically limited.

[0153] Preferably, the value range of the frequency f is 30 - 60 Hz, and the frequency f can take any value within 30 - 60 Hz; the value of the frequency f can be 30 Hz, the value of the frequency f can also be 45 Hz, and the value of the frequency f can also be 60 Hz;

[0154] The value range of t2 is 3 - 10 min, and t2 can take any value within 3 - 10 min; the value of t2 can be 3 min, the value of t2 can also be 6 min, and the value of t2 can be 10 min.

[0155] More specifically, in this embodiment, the value of the frequency f is 50 Hz, and the value of t2 can be 9 min.

[0156] Specifically, in step S44, the calculation formula for the current theoretical values of the first compressor 31 and the second compressor 32 is as follows:

[0157] I 第一压缩机理论 = A0 + A1Tev + A2Tcd + A3Tev 2+A4TevTcd + A5Tcd 2 +A6Tev 3 +A7TcdTev 2 +A8TevTcd 2 +A9Tcd 3 ,

[0158] where A0 to A9 are the ten coefficients corresponding to the first compressor 31 at frequency f;

[0159] I 第二压缩机理论 = B0 + B1Tev + B2Tcd + B3Tev 2 + B4TevTcd + B5Tcd 2 + B6Tev 3 +

[0160] B7TcdTev 2 + B8TevTcd 2 + B9Tcd 3 ,

[0161] where B0 to B9 are the ten coefficients corresponding to the second compressor 32 at frequency f.

[0162] Specifically, in steps S45 and S46, C is the first preset coefficient, D is the second preset coefficient, and the value ranges of C and D are not specifically limited. C and D are stored in the main control board 1 in advance.

[0163] Preferably, the value range of C is 95% to 97%; the first preset coefficient C can take any value within 95% to 97%;

[0164] the value range of D is 103% to 105%, and the second preset coefficient D can take any value within 103% to 105%.

[0165] The polynomial empirical model is obtained through tests under specific conditions. The current maximum deviation of the calculation accuracy of this model is approximately 2.5%. To avoid misjudgment, generally, a deviation of ±3% or more is used for judgment.

[0166] This setting can avoid misjudgment and improve the judgment accuracy.

[0167] More specifically, in this embodiment, the value of C is 96%; the value of D is 104%.

[0168] Specifically, in step S6, if the drive board model check fails, the main control board 1 reports a drive board matching failure; if the drive-compressor wiring check fails, the main control board 1 reports a drive-compressor wiring failure; if the compressor position check fails, the main control board 1 reports a compressor matching failure.

[0169] This setting facilitates reminding the user or maintenance staff of the specific type of fault in the incorrect installation or reverse connection of the dual compressors in the multi-connected outdoor unit, facilitating repair according to different fault situations and improving work efficiency.

[0170] For the control method for preventing incorrect installation or reverse connection of the dual compressors in the multi-connected outdoor unit according to this embodiment, steps S1 to S6 are interrelated and inseparable. Through the operation of steps S1 to S6, the program of the multi-connected outdoor unit can automatically perform the verification of the drive board model in step S2, the verification of the drive-compressor wiring in step S3, and the verification of the compressor position in step S4, a total of three levels of verification, enabling the multi-connected outdoor unit to pre-identify assembly errors accurately, thereby being able to pre-identify risks and protect the unit from shutting down, and further being able to avoid component damage caused by abnormal operation of the machine after incorrect installation.

[0171] Embodiment 2

[0172] This embodiment provides a multi-connected air conditioner system, which includes a multi-connected outdoor unit and a multi-connected indoor unit. The multi-connected air conditioner system includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, it implements the steps of any one of the control methods for preventing incorrect installation or reverse connection of the dual compressors in the multi-connected outdoor unit.

[0173] The multi-connected outdoor unit uses any one of the control methods for preventing incorrect installation or reverse connection of the dual compressors in the multi-connected outdoor unit as described in Embodiment 1.

[0174] For the multi-connected air conditioner system, in addition to including the control method for preventing incorrect installation or reverse connection of the dual compressors in the multi-connected outdoor unit, it also includes other related components. Since the specific structures and specific assembly relationships of its related components are all prior arts, they will not be elaborated here.

[0175] The advantages of the multi-connected air conditioner system and the above control method for preventing incorrect installation or reverse connection of the dual compressors in the multi-connected outdoor unit relative to the prior art are the same, and will not be elaborated here.

[0176] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined by the claims.

Claims

1. A control method for preventing misconnection and reverse connection of dual compressors in a multi-connected outdoor unit, characterized in that, The control method for preventing misconnection and reverse connection of the dual compressors of the multi-connected outdoor unit includes the following steps: S1. Power on the multi-connected outdoor unit; S2. Check the model of the drive board of the multi-connected outdoor unit to determine whether the drive board model check is passed. If it is, go to step S3; if not, go to step S6; S3. Check the connection between the drive and the compressor of the multi-connected outdoor unit to determine whether the drive-compressor connection check is passed. If it is, go to step S4; if not, go to step S6; S4. Check the positions of the compressors of the multi-connected outdoor unit to determine whether the compressor position check is passed. If it is, go to step S5; if not, go to step S6; S5. The installation of the dual compressors of the multi-connected outdoor unit is normal; S6. The installation of the dual compressors of the multi-connected outdoor unit is misconnected or reversed; Step S4 includes the following steps: S41. Start the first compressor (31) and the second compressor (32) simultaneously; S42. The main control board (1) obtains the currents I of the two compressors in real time 第一压缩机 、I 第二压缩机 、the suction pressure, the discharge pressure, and both the first compressor (31) and the second compressor (32) are increased to the frequency f and maintained for a time t2; S43. The main control board (1) obtains the preset ten coefficients of the first compressor (31), the preset ten coefficients of the second compressor (32), the current suction saturation temperature Tev, and the discharge saturation temperature Tcd; S44. Calculate the current theoretical current value I of the first compressor (31) 第一压缩机理论 and the current theoretical current value I of the second compressor (32) 第二压缩机理论 ; S45. Determine whether I 第一压缩机理论 *C ≤ I 第一压缩机 ≤ I 第一压缩机理论 *D, where C is the first preset coefficient and D is the second preset coefficient. If so, proceed to step S46; if not, proceed to step S6 S46. Determine whether I 第二压缩机理论 *C ≤ I 第二压缩机 ≤ I 第二压缩机理论 *D. If so, go to step S5; if not, go to step S6.

2. The control method for preventing misconnection and reverse connection of a multi-connected outdoor unit with dual compressors according to claim 1, characterized in that, Step S2 includes the following steps: S21. The main control board (1) obtains the model information sent by the first drive board (21) and the second drive board (22); S22. The main control board (1) determines whether the preset model information of the first drive board (21) is consistent with the model information sent by the first drive board (21). If it is, go to step S23; if not, go to step S6; S23. The main control board (1) determines whether the preset model information of the second drive board (22) is consistent with the model information sent by the second drive board (22). If it is, go to step S3; if not, go to step S6.

3. The control method for preventing misconnection and reverse connection of dual compressors of a multi-connected outdoor unit according to claim 1, characterized in that, Step S2 includes the following steps: S21. The main control board (1) obtains the model information sent by the first drive board (21) and the second drive board (22); S22. The main control board (1) determines whether the preset model information of the second drive board (22) is consistent with the model information sent by the second drive board (22). If it is, go to step S23; if not, go to step S6; S23. The main control board (1) determines whether the preset model information of the first drive board (21) is consistent with the model information sent by the first drive board (21). If it is, go to step S3; if not, go to step S6.

4. A control method for preventing misconnection and reverse connection of dual compressors in a multi-connected outdoor unit according to claim 2 or 3, characterized in that, Step S3 includes the following steps: S31. The main control board (1) obtains the exhaust temperature T of the compressor installed on the left 左排气0 , and the exhaust temperature T of the compressor installed on the right 右排气0 ; S32. Start the first compressor (31). The correct installation position of the first compressor (31) is on the left side, and the second compressor (32) remains in the stopped state; After the first compressor (31) starts and runs for a time t1, the main control board (1) obtains the exhaust temperature T of the compressor installed on the left 左排气1 , the exhaust temperature T of the compressor installed on the right 右排气1 ; S34. The main control board (1) determines whether T 左排气1 <T 左排气0 +A or T 右排气1 >T 右排气0 +B, where A is a first preset constant and B is a second preset constant. If so, go to step S6; if not, go to step S4.

5. A control method for preventing misconnection and reverse connection of a multi-connected outdoor unit with dual compressors according to claim 2 or 3, characterized in that, Step S3 includes the following steps: S31. The main control board (1) obtains the exhaust temperature T of the compressor installed on the left 左排气0 , the exhaust temperature T of the compressor installed on the right 右排气0 ; S32. Start the second compressor (32). The correct installation position of the second compressor (32) is on the right side, and the first compressor (31) remains in the stopped state; S33. After the second compressor (32) has started and run for a time t1, the main control board (1) obtains the exhaust temperature T of the compressor installed on the left 左排气2 and the exhaust temperature T of the compressor installed on the right 右排气2 ; S34. The main control board (1) determines whether T 右排气2 <T 右排气0 +A or T 左排气2 >T 左排气0 +B, where A is the first preset constant and B is the second preset constant. If so, go to step S6; if not, go to step S4.

6. A control method for preventing misconnection and reverse connection of dual compressors in a multi-connected outdoor unit according to claim 1, characterized in that, Or, step S4 includes the following steps: S41. Start the first compressor (31) and the second compressor (32) simultaneously; S42. The main control board (1) obtains the currents I of the two compressors in real time 第一压缩机 、I 第二压缩机 、the suction pressure, the discharge pressure, and both the first compressor (31) and the second compressor (32) are up-regulated to the frequency f and maintained for a time t2; S43. The main control board (1) obtains the preset ten coefficients of the first compressor (31), the preset ten coefficients of the second compressor (32), the current suction saturation temperature Tev, and the discharge saturation temperature Tcd; S44. Calculate the current theoretical current value I of the first compressor (31) 第一压缩机理论 and the current theoretical current value I of the second compressor (32) 第二压缩机理论 ; S45. Determine whether I 第二压缩机理论 *C ≤ I 第二压缩机 ≤ I 第二压缩机理论 *D, where C is a first preset coefficient and D is a second preset coefficient. If so, proceed to step S46; if not, proceed to step S6 S46. Determine whether I 第一压缩机理论 *C ≤ I 第一压缩机 ≤ I 第一压缩机理论 *D. If so, go to step S5; if not, go to step S6.

7. A control method for preventing misconnection and reverse connection of a dual compressor in a multi-connected outdoor unit according to claim 1 or 6, characterized in that, In step S44, the current theoretical current value I of the first compressor (31) 第一压缩机理论 and the current theoretical current value I of the second compressor (32) 第二压缩机理论 are calculated as follows: I 第一压缩机理论 = A0 + A1Tev + A2Tcd + A3Tev 2 + A4TevTcd + A5Tcd 2 + A6Tev 3 + A7TcdTev 2 + A8TevTcd 2 + A9Tcd 3 , where A0 to A9 are the ten coefficients corresponding to the first compressor (31) at the frequency f; I 第二压缩机理论 = B0 + B1Tev + B2Tcd + B3Tev 2 + B4TevTcd + B5Tcd 2 + B6Tev 3 + B7TcdTev 2 + B8TevTcd 2 + B9Tcd 3 , Where B0 to B9 are ten coefficients corresponding to the second compressor (32) at frequency f.

8. A control method for preventing wrong connection and reverse connection of a dual compressor in a multi-connected outdoor unit according to claim 1, characterized in that, In step S6, if the drive board model check fails, the main control board (1) reports a drive board matching fault; if the drive-compressor wiring check fails, the main control board (1) reports a drive-compressor wiring fault; if the compressor position check fails, the main control board (1) reports a compressor matching fault.

9. A multi-connected air-conditioning system, characterized in that, The multi-connected air conditioner system includes a multi-connected outdoor unit and multi-connected indoor units. The multi-connected outdoor unit uses a control method for preventing wrong connection and reverse connection of a dual compressor in a multi-connected outdoor unit according to any one of claims 1 to 8. The multi-connected outdoor unit includes a main control board (1), a first drive board (21), a second drive board (22), a first compressor (31), and a second compressor (32). One end of the first drive board (21) is connected to the main control board (1), and the other end of the first drive board (21) is connected to the first compressor (31); one end of the second drive board (22) is connected to the main control board (1), and the other end of the second drive board (22) is connected to the second compressor (32). The first drive board (21) and the first compressor (31) are installed on one side inside the multi-connected outdoor unit, and the second drive board (22) and the second compressor (32) are installed on the other side inside the multi-connected outdoor unit, which is opposite to the first drive board (21) and the first compressor (31).

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