Valve combined control method, device and storage medium for multi-connected air conditioning system

Abstract

The present invention provides a method, device and storage medium for combined control of valves in a multi-connected air-conditioning system. The control method includes: obtaining a preset mass flow density ratio between valves; obtaining the relative opening degree of a set valve, and obtaining the mass flow density of the set valve according to the relative opening degree of the set valve; obtaining the preset mass flow density ratios of other valves according to the mass flow density of the set valve and the preset mass flow density ratio; obtaining the optimal relative opening degrees of other valves according to the preset mass flow density ratios of other valves; and controlling other valves according to the optimal relative opening degrees of other valves. The technical solution provided by the present invention can improve the stability of the control of the multi-connected air-conditioning system.

Description

Technical Field

[0001] The present invention relates to the technical field of valve combined control of a multi-connected air-conditioning system, and particularly to a valve combined control method, device and storage medium for a multi-connected air-conditioning system. Background Art

[0002] A multi-connected air-conditioning system refers to a system in which multiple indoor air-conditioning units and multiple outdoor air-conditioning units are provided. The multiple indoor air-conditioning units and the multiple outdoor air-conditioning units are connected into a refrigeration cycle mechanism through connecting pipes. Since different specifications of indoor air-conditioning units can be used in the multi-connected air-conditioning system to meet different application scenarios, and multiple outdoor air-conditioning units can be used to provide sufficient outdoor unit capacity, the multi-connected air-conditioning system can meet the needs of multiple application scenarios and has the advantage of strong applicability.

[0003] Taking Figure 1 the structure shown as an example, a multi-connected air-conditioning system has multiple outdoor air-conditioning units 11 and multiple indoor air-conditioning units 12. Each outdoor air-conditioning unit 11 is used to be assembled outdoors, each indoor air-conditioning unit 12 is used to be assembled indoors, and each outdoor air-conditioning unit 11 is connected to each indoor air-conditioning unit 12 through a connecting pipe 13. A plurality of parallel outdoor connecting pipes 14 are provided on the pipeline between the outdoor air-conditioning unit 11 and the connecting pipe 13, and corresponding valves 15 are respectively provided on each outdoor connecting pipe 14. During the operation of the multi-connected air-conditioning system, the refrigerant flow rate transmitted from the outdoor air-conditioning unit 11 to the connecting pipe 13 can be adjusted by controlling each valve 15, so as to control the refrigeration or heating effect of the multi-connected air-conditioning system.

[0004] Currently, the valve 15 in the multi-connected air-conditioning system is a thermostatic expansion valve, and its opening degree is controlled according to the superheat degree of the refrigerant, that is, when the temperature of the refrigerant rises, the opening degree of the valve 15 becomes larger; correspondingly, when the temperature of the refrigerant drops, the opening degree of the valve 15 becomes smaller. However, this control method will cause the opening degrees of the valves 15 to be in dynamic change, which is not conducive to the stable operation of the multi-connected air-conditioning system.

[0005] In summary, it can be seen that in the multi-connected air-conditioning system in the prior art, the valve control method has the problem of affecting the operation stability of the system. Summary of the Invention

[0006] The purpose of the present invention is to provide a valve combined control method, device and storage medium for a multi-connected air-conditioning system, so as to at least solve the problem of affecting the operation stability of the system existing in the valve control method in the multi-connected air-conditioning system.

[0007] A valve combined control method for a multi-connected air-conditioning system includes:

[0008] Obtaining a preset mass flow density ratio between the valves;

[0009] Obtain the relative opening degree of the set valve, and obtain the mass flow density of the set valve according to the relative opening degree of the set valve;

[0010] According to the mass flow density of the set valve and the preset mass flow density ratio, obtain the preset mass flow density ratios of the other valves;

[0011] According to the preset mass flow density ratios of the other valves, obtain the optimal relative opening degrees of the other valves;

[0012] Control the other valves according to the optimal relative opening degrees of the other valves.

[0013] According to an embodiment of the present invention, the obtaining the preset mass flow density ratios between the valves includes:

[0014] Obtain a mass flow density database, in which the preset mass flow density ratios between the valves under the working conditions corresponding to multiple outdoor environments are stored;

[0015] Query the mass flow density database according to the working conditions corresponding to the outdoor environment where the multi-connected air conditioner is located, and obtain the preset mass flow density ratios between the valves; or

[0016] Obtain the mass flow density ratios between the valves under the standard, and use the mass flow density ratios between the valves under the standard as the preset mass flow density ratios between the valves.

[0017] According to an embodiment of the present invention, the obtaining the relative opening degree of the set valve includes:

[0018] Obtain a valve optimal relative opening degree database, in which the optimal relative opening degrees of multiple types of valves under multiple working conditions are stored;

[0019] Obtain the type of the set valve and the working conditions corresponding to the outdoor environment where the multi-connected air conditioner is located, and query the valve optimal relative opening degree database according to the type of the set valve and the working conditions corresponding to the outdoor environment where the multi-connected air conditioner is located, and obtain the relative opening degree of the set valve.

[0020] According to an embodiment of the present invention, the obtaining the relative opening degree of the set valve includes:

[0021] Detect the actual opening degree of the set valve;

[0022] According to the actual opening degree and the maximum opening degree of the set valve, obtain the relative opening degree of the set valve.

[0023] According to an embodiment of the present invention, the obtaining the mass flow density of the set valve according to the relative opening degree of the set valve includes:

[0024] Obtain the relationship model between the relative opening of the valve and the mass flow density;

[0025] According to the relative opening of the set valve and the relationship model, calculate the mass flow density of the set valve;

[0026] The calculating the optimal relative opening of each other valve according to the preset mass flow density ratio of each other valve includes:

[0027] According to the preset mass flow density ratio of each other valve and the relationship model, obtain the optimal relative opening of each other valve.

[0028] According to an embodiment of the present invention, the obtaining the optimal relative opening of each other valve according to the preset mass flow density ratio of each other valve and the relationship model includes:

[0029] Judge whether the optimal relative opening of each other valve is greater than the corresponding maximum opening;

[0030] If the optimal relative opening of a valve is greater than the corresponding maximum opening, then use the corresponding maximum opening of the valve as the optimal relative opening of the valve.

[0031] According to an embodiment of the present invention, the obtaining the optimal relative opening of each other valve according to the preset mass flow density ratio of each other valve and the relationship model includes:

[0032] Input the preset mass flow density ratios of each other valve into the relationship model respectively;

[0033] If after the preset mass flow density ratio of a valve is input into the relationship model, the relationship model does not output, then use the maximum relative opening of the valve as the optimal relative opening of the valve.

[0034] According to an embodiment of the present invention, the controlling each other valve according to the optimal relative opening of each other valve includes:

[0035] According to the optimal relative opening and the maximum opening of each other valve, calculate the opening to be opened of each other valve;

[0036] Control each other valve respectively according to the opening to be opened of each other valve.

[0037] A valve combined control device for a multi-connected air-conditioning system, including a processor and a memory, the memory stores computer program instructions, when the computer program instructions are executed by the processor, implement the valve combined control method for the multi-connected air-conditioning system according to any one of the above embodiments.

[0038] A computer-readable storage medium stores computer program instructions, which, when executed by a processor, implement the valve combined control method of the multi-connected air-conditioning system according to any one of the above embodiments.

[0039] For the technical solution provided by the present invention, first, the preset mass flow density ratio between valves is obtained, then the relative opening of a set valve is obtained, and the corresponding mass flow density is obtained according to the relative opening of the set valve; then, according to the above preset mass flow density ratio and the mass flow density of the set valve, the optimal relative openings of all other valves are calculated; finally, the corresponding optimal relative openings are obtained according to the preset mass flow density ratios of the other valves, and the other valves are controlled according to the optimal relative openings of the other valves. For the technical solution provided by the present invention, the relative openings of the valves are controlled according to the mass flow density. On the one hand, the demand of the multi-connected air-conditioning system for refrigerant transmission can be ensured, and on the other hand, the openings of the valves can be accurately controlled to ensure the stability of the operation of the multi-connected air-conditioning system.

[0040] Through the following detailed description of specific embodiments of the present invention in conjunction with the drawings, those skilled in the art will become more clear about the above and other objects, advantages and features of the present invention. Description of the Drawings

[0041] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the drawings in an exemplary but not restrictive manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0042] Figure 1 is a schematic structural diagram of a multi-connected air-conditioning system;

[0043] Figure 2 is a flowchart of a valve combined control method for a multi-connected air-conditioning system according to an embodiment of the present invention;

[0044] Figure 3 is a schematic connection diagram between an outdoor unit and an indoor unit of an air conditioner according to an embodiment of the present invention;

[0045] Figure 4 is a flowchart of obtaining the preset mass flow density ratio between valves according to an embodiment of the present invention;

[0046] Figure 5 is a flowchart of obtaining the relative opening of a set valve according to an embodiment of the present invention;

[0047] Figure 6 is a flowchart of obtaining the mass flow density of the set valve according to the relative opening of the set valve according to an embodiment of the present invention;

[0048] Figure 7 is a flowchart for obtaining the relationship model between the relative opening of the valve and the mass flow density according to an embodiment of the present invention;

[0049] Figure 8 is a flowchart for obtaining the optimal relative opening of each other valve according to the preset mass flow density ratio of each other valve and the relationship model according to an embodiment of the present invention;

[0050] Figure 9 is a flowchart for obtaining the optimal relative opening of each other valve according to the preset mass flow density ratio of each other valve and the above relationship model according to an embodiment of the present invention

[0051] Figure 10 is a flowchart for controlling each other valve according to the optimal relative opening of each other valve according to an embodiment of the present invention;

[0052] Figure 11 is a schematic structural diagram of a valve combined control device for a multi-connected air-conditioning system according to an embodiment of the present invention. Detailed implementation manners

[0053] In the description of this embodiment, the descriptions with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] Figure 2 Shown is the flow of a valve combined control method for a multi-connected air-conditioning system of the present application. This control method can Figure 1 perform combined control on multiple valves of the multi-connected air-conditioning system shown. And in the present application, the valves in the multi-connected air-conditioning system are electronic expansion valves. By using the control method of the present application to control each valve, the operation stability of the multi-connected air-conditioning system can be improved. The following combines Figure 2 the flow shown to give a detailed introduction to the valve combined control method of the multi-connected air-conditioning system of the present application.

[0055] As Figure 2 shown, the valve combined control method for the multi-connected air-conditioning system of the present application includes:

[0056] Step S1: Obtain the preset mass flow density ratio between each valve;

[0057] Step S2: Obtain the relative opening degree of the set valve, and obtain the mass flow density of the set valve according to the relative opening degree of the set valve;

[0058] Step S3: Obtain the preset mass flow density ratios of the other valves according to the mass flow density of the set valve and the preset mass flow density ratio;

[0059] Step S4: Obtain the optimal relative opening degrees of the other valves according to the preset mass flow density ratios of the other valves;

[0060] Step S5: Control the other valves according to the optimal relative opening degrees of the other valves.

[0061] In the above step S1, each valve is a valve on each outdoor unit connecting pipe of the air conditioner outdoor unit. For the convenience of describing the technical solution of the present application. In this embodiment, it is taken as an example that the air conditioner outdoor unit has two outdoor unit connecting pipes, and one valve is provided on each outdoor unit connecting pipe, as Figure 3 shown, where Leval1 is the first valve and Leval2 is the second valve; Figure 3 The air conditioner outdoor unit has a first outdoor heat exchanger and a second outdoor heat exchanger, and the air conditioner indoor unit has an indoor heat exchanger. The first outdoor heat exchanger is connected to the indoor heat exchanger through the first valve, and the second outdoor heat exchanger is connected to the indoor heat exchanger through the second valve. Under the action of the compressor, the refrigerant flow in the heat circulation loop can be controlled. During the operation of the multi-connected air conditioner system, the refrigerant flow between the first outdoor heat exchanger and the indoor heat exchanger can be adjusted by controlling the first valve, and the refrigerant flow between the second outdoor heat exchanger and the indoor heat exchanger can be adjusted by controlling the second valve. Suppose the preset mass flow density ratio between the first valve and the second valve obtained in this step S1 is R g .

[0062] In the above step S2, taking the first valve as the set valve as an example, suppose the obtained relative opening degree of the first valve is x1. Since there is a corresponding relationship between the valve opening degree and the mass flow density, the mass flow density G1 of the first valve can be calculated according to this corresponding relationship through the relative opening degree x1 of the first valve.

[0063] In the above step S3, suppose the mass flow density of the second valve is G2, then the mass flow density G2 of the second valve can be calculated through the following calculation formula (1) according to the mass flow density G1 of the first valve and the preset mass flow density ratio R g ,

[0064] G2 = G1 / R g (1)

[0065] In the above step S4, according to the relationship between the relative opening of the valve and the mass flow density, and the mass flow density G2 of the second valve calculated in the above step S3, the optimal relative opening x2 of the second valve can be obtained. Controlling the second valve according to the optimal relative opening x2 can ensure the working efficiency and operation reliability of the corresponding air conditioner outdoor unit.

[0066] In the above step S5, the opening of the second valve can be adjusted so that the relative opening of the second valve is the optimal relative opening x2.

[0067] The technical solution provided by the present invention can control the relative opening of each valve according to the mass flow density, so that the mass flow density ratio of each valve in the multi-connected air conditioner system is the preset mass flow density ratio. On the one hand, it can ensure the demand for refrigerant transmission in the multi-connected air conditioner system, and on the other hand, it can accurately control the opening of each valve to ensure the stability of the operation of the multi-connected air conditioner system.

[0068] In one embodiment, the process of obtaining the preset mass flow density ratio between the valves in the above step S1 is as Figure 4 shown, including:

[0069] Step S101: Obtain a mass flow density database, which stores the preset mass flow density ratios between the valves under the working conditions corresponding to multiple outdoor environments.

[0070] Step S102: Query the mass flow density database according to the working conditions corresponding to the outdoor environment where the multi-connected air conditioner is located, and obtain the preset mass flow density ratios between the valves.

[0071] In the above step S101, the multi-connected air conditioner system can be experimented under multiple working conditions to obtain the preset mass flow density ratios between the valves under the working conditions corresponding to multiple outdoor environments, and then store the preset mass flow density ratios between the valves under the working conditions corresponding to multiple outdoor environments in the mass flow density database. For example, when there are two valves corresponding to the air conditioner outdoor unit, the mass flow density database stores the preset mass flow density ratios between the two valves under the working conditions corresponding to multiple outdoor environments.

[0072] In the above step S102, the mass flow density database can be queried according to the working conditions corresponding to the outdoor environment where the multi-connected air conditioner is located. For example, when the working conditions corresponding to the outdoor environment include the outdoor ambient temperature, the mass flow density database can be queried according to the outdoor temperature where the multi-connected air conditioner is located, and the preset mass flow density ratio R between the valves under the working conditions corresponding to the outdoor environment where the multi-connected air conditioner is located can be obtained. g .

[0073] In another embodiment, the multi-connected air-conditioning system can be experimented under standard working conditions to obtain the mass flow density ratio between valves when the air-conditioning working performance is optimal. In the above step S1, this mass flow density is used as the preset mass flow density ratio between valves.

[0074] In one embodiment, in the above step S2, the process of obtaining the relative opening degree of the set valve is as Figure 5 shown, including:

[0075] Step S201: Obtain the valve optimal relative opening degree database, which stores the optimal relative opening degrees of multiple types of valves under multiple working conditions.

[0076] Step S202: Obtain the type of the set valve and the working condition corresponding to the outdoor environment where the multi-connected air conditioner is located, and query the valve optimal relative opening degree database according to the type of the set valve and the working condition corresponding to the outdoor environment where the multi-connected air conditioner is located to obtain the relative opening degree of the set valve.

[0077] In the above step S201, the optimal relative opening degrees of multiple types of valves under multiple working conditions can be stored in the valve optimal relative opening degree database, so that the valve optimal relative opening degree database stores the optimal relative opening degrees of multiple types of valves under various working conditions. In this embodiment, the optimal relative opening degree of the valve refers to the relative opening degree when the valve working performance is the most stable.

[0078] In the above step S202, the type of the set valve can be obtained according to the nameplate of the set valve, and then the valve optimal relative opening degree database is queried according to the type and the working condition corresponding to the outdoor environment where the multi-connected air conditioner is located to obtain the corresponding optimal relative opening degree, and this relative opening degree is used as the relative opening degree of the set valve.

[0079] Through the setting method of this embodiment, the relative opening degree of the set valve can be controlled to the optimal relative opening degree under the working condition corresponding to the outdoor environment where the multi-connected air conditioner is located, improving the reliability of controlling the set valve.

[0080] In one embodiment, in the above step S2, the method for obtaining the relative opening degree of the set valve includes: first detecting the actual opening degree of the set valve, and then obtaining the relative opening degree of the set valve according to the actual opening degree and the maximum opening degree of the set valve.

[0081] The actually obtained actual opening degree of the set valve refers to the actual opening degree of the set valve obtained by detecting the set valve; after obtaining the opening degree and the maximum opening degree of the set valve, calculate the ratio between the actual opening degree and the maximum opening degree of the set valve, and this ratio is the relative opening degree of the set valve.

[0082] In one embodiment, the process of obtaining the mass flow density of the set valve according to the relative opening of the set valve in step S2 above is as follows Figure 6 shown, including:

[0083] Step S211: Obtain the relationship model between the relative opening of the valve and the mass flow density;

[0084] Step S212: Calculate the mass flow density of the set valve according to the relative opening of the set valve and the relationship model between the relative opening of the valve and the mass flow density;

[0085] Correspondingly, in step S4 above, calculating the optimal relative opening of each other valve according to the preset mass flow density ratio of each other valve includes: obtaining the optimal relative opening of each other valve according to the preset mass flow density ratio of each other valve and the relationship model between the relative opening of the valve and the mass flow density.

[0086] In this embodiment, the relationship model between the relative opening of the valve and the mass flow density in step S211 above is:

[0087] G = ax 2 + bx + c (2)

[0088] where x is the mass flow density of the valve, G is the relative opening of the valve when the mass flow density of the valve is x, and a, b, and c are matching coefficients.

[0089] In step S212 above, taking the example that there are two valves corresponding to the outdoor unit of the air conditioner and the first valve is the set valve, if the relative opening of the set valve is x1 and the mass flow density is G1, then substituting the relative opening x1 and the mass flow density G1 of the first valve into the above formula (2), we can get:

[0090]

[0091] Since the relative opening x1 of the first valve is a known quantity, therefore, by solving the above calculation formula, the mass flow density G1 of the first valve can be calculated.

[0092] Correspondingly, in step S4 above, assuming that the preset mass flow density ratio of the second valve is G2 and the optimal relative opening is x2, then substituting the preset mass flow density ratio G2 and the optimal relative opening x2 of the second valve into the above formula (2), we can get:

[0093]

[0094] Since the preset mass flow density ratio G2 of the second valve is a known quantity, therefore, the optimal relative opening x2 of the second valve can be calculated.

[0095] In one embodiment, the process of obtaining the relationship model between the relative valve opening and the mass flow density in step S211 is as follows Figure 7 shown, including:

[0096] Step S221: Obtain the initial relationship model between the relative valve opening and the mass flow density;

[0097] Step S222: Obtain experimental data, and use the experimental data to fit the parameters in the above initial relationship model to obtain the relationship model between the relative valve opening and the mass flow density.

[0098] In the above step S221, let the initial relationship model between the relative valve opening and the mass flow density be

[0099] G = a0x 2 + b0x + c0 (5)

[0100] where a0, b0, and c0 are initial parameter values.

[0101] In the above step S222, the obtained experimental data includes multiple groups of relative valve openings and mass flow densities of the valve. Then, the multiple groups of relative valve openings and mass flow densities of the valve are substituted into the above initial relationship model, and a0, b0, and c0 are fitted so that the error of the obtained relationship model is less than the set error value, thereby obtaining the relationship model between the relative valve opening and the mass flow density of the valve.

[0102] The process of obtaining the optimal relative opening of each other valve according to the preset mass flow density ratio of each other valve and the relationship model between the relative valve opening and the mass flow density in step S212 is as follows Figure 8 shown, including:

[0103] Step S231: Determine whether the optimal relative opening of each other valve is greater than the corresponding maximum opening;

[0104] Step S232: If the optimal relative opening of a valve is greater than the corresponding maximum opening, then use the corresponding maximum opening of the valve as the optimal relative opening of the valve.

[0105] In this embodiment, when the optimal relative opening of a valve is greater than the maximum relative opening of the valve, it means that the optimal control cannot be achieved. Therefore, using the maximum relative opening as the optimal relative opening can improve the reliability of the control of the multi-split air conditioner system.

[0106] In one embodiment, the process of obtaining the optimal relative opening of each other valve according to the preset mass flow density ratio of each other valve and the relationship model between the relative valve opening and the mass flow density in step S213 is as follows Figure 9 shown, including:

[0107] Step S241: Input the preset mass flow density ratios of the other valves into the relationship model between the relative opening of the valve and the mass flow density respectively;

[0108] Step S242: If after the preset mass flow density ratio of a valve is input into the above relationship model, the above relationship model does not output, then take the maximum relative opening of this valve as the optimal relative opening of this valve.

[0109] In the above Step S241, taking the relationship model between the relative opening of the valve and the mass flow density as the above formula (2) as an example, it can be known from formula (2) that the relationship model between the relative opening of the valve and the mass flow density is a quadratic equation of one variable. When calculating the optimal relative opening x of the valve according to the mass flow density G of the valve, there may be a situation where formula (2) has no solution. For example, when the preset mass flow density ratio of the second valve is x2 and the optimal relative opening is G2, there is the following calculation formula:

[0110]

[0111] By solving the above formula, it can be obtained that:

[0112]

[0113] Δ = b 2 - 4a(c - G2) (8)

[0114] When the value of Δ is less than 0, x2 has no solution, that is, the preset mass flow density ratio of the second valve cannot be calculated. At this time, take the maximum relative opening of this second valve as the optimal relative opening of this second valve.

[0115] In one embodiment, the process of controlling the other valves according to the optimal relative openings of the other valves in the above Step S5 is as Figure 10 shown, including:

[0116] Step S501: Calculate the opening degrees to be opened of the other valves according to the optimal relative openings and the maximum opening degrees of the other valves;

[0117] Step S502: Control the other valves respectively according to the opening degrees to be opened of the other valves above.

[0118] In the above Step S501, taking the second valve as an example, when the optimal relative opening of the second valve is x2 and the maximum opening degree is LEVMAX, the opening degree Leval to be opened of this second valve is:

[0119] Leval = x2 × LEVMAX (9)

[0120] In the above step S502, the opening degree of the second valve can be controlled to be Leval. Through the setting method of this embodiment, the mass flow density ratio between the valves in the multi-connected air conditioner system can be made to be the preset mass flow density ratio, thereby improving the working efficiency of each outdoor unit in the air conditioner system.

[0121] The present invention also provides a valve combined control device for a multi-connected air conditioner system, as Figure 11 shown. The device includes a processor, a memory, a communication interface, and a communication bus. The processor, the memory, and the communication interface complete mutual communication through the communication bus. The processor is used to provide computing and control capabilities. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer program instructions. The internal memory provides an environment for the operation of the operating system and computer program instructions in the non-volatile storage medium. The communication interface of the above device is used to communicate with an external terminal in a wired or wireless manner. The wireless manner can be implemented through WIFI, a carrier network, NFC (Near Field Communication), or other technologies. For the valve combined control device of the multi-connected air conditioner system provided in this embodiment, its memory is used to store computer program instructions, and when the computer program instructions are executed by the processor, multiple embodiments of the above valve combined control method of the multi-connected air conditioner system can be implemented.

[0122] The present invention also provides a computer-readable storage medium. Those of ordinary skill in the art can understand that all or part of the processes in the embodiments of the above valve combined control method of the multi-connected air conditioner system can be completed by computer program instructions instructing relevant hardware. The computer program instructions can be stored in a non-volatile computer-readable storage medium. When the computer program instructions are executed, they can include the processes of the above method embodiments. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided by the present invention can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or an external cache. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0123] At this point, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and determined to cover all such other variations or modifications.

Claims

1. A valve combined control method for a multi-connected air conditioning system, characterized in that, Including: Obtain the preset mass flow density ratio between each valve; each of the valves is a valve on each outdoor unit connecting pipe of the outdoor unit of the multi-connected air conditioner system; Obtain the relative opening degree of the set valve, and obtain the mass flow density of the set valve according to the relative opening degree of the set valve; According to the mass flow density of the set valve and the preset mass flow density ratio, obtain the preset mass flow density ratios of the other valves; According to the preset mass flow density ratios of the other valves, obtain the optimal relative opening degrees of the other valves; Control the other valves according to the optimal relative opening degrees of the other valves; The obtaining the mass flow density of the set valve according to the relative opening degree of the set valve includes: Obtain the relationship model between the valve relative opening degree and the mass flow density; Calculate the mass flow density of the set valve according to the relative opening degree of the set valve and the relationship model; The calculating the optimal relative opening degrees of the other valves according to the preset mass flow density ratios of the other valves includes: Obtain the optimal relative opening degrees of the other valves according to the preset mass flow density ratios of the other valves and the relationship model.

2. The valve combined control method of the multi-connected air-conditioning system according to claim 1, characterized in that The obtaining the preset mass flow density ratio between each valve includes: Obtain a mass flow density database, which stores the preset mass flow density ratios between each valve under the working conditions corresponding to multiple outdoor environments; Query the mass flow density database according to the working conditions corresponding to the outdoor environment where the multi-connected air conditioner is located, and obtain the preset mass flow density ratio between each valve; or Obtain the mass flow density ratio between each valve under the standard, and use the mass flow density ratio between each valve under the standard as the preset mass flow density ratio between each valve.

3. The valve combined control method of the multi-connected air-conditioning system according to claim 1, characterized in that, The obtaining the relative opening degree of the set valve includes: Obtain a valve optimal relative opening degree database, which stores the optimal relative opening degrees of multiple types of valves under multiple working conditions; Obtain the type of the set valve and the working conditions corresponding to the outdoor environment where the multi-connected air conditioner is located, and query the valve optimal relative opening degree database according to the type of the set valve and the working conditions corresponding to the outdoor environment where the multi-connected air conditioner is located, and obtain the relative opening degree of the set valve.

4. The valve combined control method of the multi-connected air-conditioning system according to claim 1, wherein, The obtaining the relative opening degree of the set valve includes: Detect the actual opening degree of the set valve; Obtain the relative opening degree of the set valve according to the actual opening degree and the maximum opening degree of the set valve.

5. The valve combined control method of the multi-connected air conditioning system according to claim 1, characterized in that, The obtaining the optimal relative opening degrees of the other valves according to the preset mass flow density ratios of the other valves and the relationship model includes: Judge whether the optimal relative opening degrees of the other valves are greater than the corresponding maximum opening degrees; If the optimal relative opening degree of a valve is greater than the corresponding maximum opening degree, then use the corresponding maximum opening degree of this valve as the optimal relative opening degree of this valve.

6. The valve combined control method of the multi-connected air conditioner system according to claim 1, characterized in that, The obtaining the optimal relative opening degrees of the other valves according to the preset mass flow density ratios of the other valves and the relationship model includes: Input the preset mass flow density ratios of the other valves into the relationship model respectively; If, after the preset mass flow density ratio of a valve is input into the relationship model and the relationship model does not output, the maximum relative opening of the valve is taken as the optimal relative opening of the valve.

7. The valve combined control method of the multi-connected air-conditioning system according to claim 1, wherein The controlling of the other valves according to the optimal relative openings of the other valves includes: Calculating the opening degrees to be opened of the other valves according to the optimal relative opening degrees and the maximum opening degrees of the other valves; Controlling the other valves respectively according to the opening degrees to be opened of the other valves.

8. A valve combined control device for a multi-connected air conditioning system, characterized in that, It includes a processor and a memory, and the memory stores computer program instructions. When the computer program instructions are executed by the processor, the valve combined control method of the multi-connected air conditioner system according to any one of claims 1-7 is implemented.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions. When the computer program instructions are executed by the processor, the valve combined control method of the multi-connected air conditioner system according to any one of claims 1-7 is implemented.

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