CN104833041B - A kind of combined air conditioners pipeline balance method and combined air conditioners - Google Patents

Abstract

The embodiment of the present invention discloses a multi-connected air conditioner pipeline balancing method and a multi-connected air conditioner. The method includes: before the operation of the multi-connected air conditioner, obtain the air pressure voltage value of the air conditioner outdoor unit and the air pressure voltage value of each air conditioner indoor unit; The air pressure voltage value of the air conditioner outdoor unit and the air pressure voltage value of each air conditioner indoor unit, respectively calculate the difference in the air pressure voltage value between the air conditioner outdoor unit and each air conditioner indoor unit; Describe the air pressure and voltage difference between each air conditioner indoor unit, respectively determine the height difference between the air conditioner outdoor unit and each air conditioner indoor unit; adjust the target pressure of the air conditioner outdoor unit and each air conditioner according to the determined height difference The refrigerant flow rate of the indoor unit is used to balance the pipelines when the multi-connected air conditioner is running. The technical solution of this embodiment can balance the pipelines of the multi-connected air conditioner, can automatically adjust the target pressure of the outdoor unit and the refrigerant flow rate of the terminal air conditioner, and ensure the cooling/heating effect of the entire multi-connected air conditioner is balanced.

Description

A multi-connected air conditioner pipeline balancing method and multi-connected air conditioner

technical field

The invention relates to the technical field of multi-connected air conditioners, in particular to a multi-connected air conditioner pipeline balancing method and a multi-connected air conditioner.

Background technique

In recent years, multi-connected products have become more and more popular among users, and the outdoor units of multi-connected air conditioners have become larger and larger, followed by an increase in the number of indoor units that can be matched by a multi-connected system. In this way, in the actual installation, the installation area of a multi-connected system is larger, and the height difference between the outdoor unit of the air conditioner and the indoor unit of the air conditioner is greater. The increase in the height difference will cause a pressure difference between the outdoor unit of the air conditioner and the refrigerant in the pipeline of the indoor unit at the end. At present, the control of the pipeline pressure is completed in the outdoor unit of the air conditioner; the pipeline pressure of the outdoor unit of the air conditioner control system is normally To achieve the best condensation effect; but when the system pipeline is relatively long, the pressure will drop when the refrigerant flows to the end of the system, resulting in poor cooling/heating effect of the internal unit.

At present, various air conditioner manufacturers have not launched a scheme for automatic compensation of the effect of the terminal air conditioner with a relatively large height difference. The general method is to set a dial code on both the outdoor unit and the indoor unit computer board. When it is found that the pipeline of the unit is long and the height difference is large, set it to provide the target pressure and increase the refrigerant flow.

This method of using dial switches or other setting methods to set the function of air-conditioning units with large height differences is cumbersome to set, and it is difficult to determine the height difference, which cannot fundamentally solve the problem of multi-connected air conditioners in each room. The problem of unbalanced refrigerant flow between machines.

Contents of the invention

In view of this, an embodiment of the present invention provides a method for balancing pipelines of a multi-connected air conditioner and a multi-connected air conditioner, so as to solve the problem of unbalanced flow of refrigerant between indoor units of the multi-connected air conditioner.

Embodiments of the present invention adopt the following technical solutions:

In the first aspect, an embodiment of the present invention provides a method for balancing multiple air-conditioning pipelines, including:

Before the operation of the multi-connected air conditioner, obtain the air pressure and voltage values of the air conditioner outdoor unit and the air pressure and voltage values of each air conditioner indoor unit;

According to the air pressure voltage value of the air conditioner outdoor unit and the air pressure voltage value of each air conditioner indoor unit, respectively calculate the difference in air pressure voltage value between the air conditioner outdoor unit and each air conditioner indoor unit;

Determine the height difference between the air conditioner outdoor unit and each air conditioner indoor unit respectively according to the difference in air pressure and voltage between the air conditioner outdoor unit and each of the air conditioner indoor units;

The target pressure of the air conditioner outdoor unit and the refrigerant flow rate of each air conditioner indoor unit are adjusted according to the determined height differences, so as to balance the pipelines when the multi-connected air conditioner is in operation.

In the second aspect, the embodiment of the present invention also provides a multi-connected air conditioner, including a control module, an air conditioner outdoor unit, at least one air conditioner indoor unit, and at least one electronic expansion valve, wherein each air conditioner indoor unit corresponds to an electronic expansion valve ;

The control module is used for:

Before the operation of the multi-connected air conditioner, the air pressure voltage value of the air conditioner outdoor unit and the air pressure voltage value of each air conditioner indoor unit are obtained;

According to the air pressure voltage value of the air conditioner outdoor unit and the air pressure voltage value of each air conditioner indoor unit, respectively calculate the difference in air pressure voltage value between the air conditioner outdoor unit and each air conditioner indoor unit;

Determine the height difference between the air conditioner outdoor unit and each air conditioner indoor unit respectively according to the difference in air pressure and voltage between the air conditioner outdoor unit and each of the air conditioner indoor units;

Adjust the target pressure of the outdoor unit of the air conditioner and the opening degree of the electronic expansion valve corresponding to the indoor unit of the air conditioner according to the determined height differences, so as to balance the pipelines when the multi-connected air conditioner is in operation.

The beneficial technical effect of the technical scheme that the embodiment of the present invention proposes is:

The technical solution of the embodiment of the present invention obtains the air pressure voltage value of the air conditioner outdoor unit and the air pressure voltage value of each air conditioner indoor unit before the operation of the multi-connected air conditioner, and then calculates the difference between the air conditioner outdoor unit and each air conditioner indoor unit respectively. Then obtain the height difference between the air conditioner outdoor unit and each air conditioner indoor unit, and then adjust the target pressure of the air conditioner outdoor unit and the refrigerant flow rate of each air conditioner indoor unit according to the determined height differences In order to make the pipeline balance when the multi-connected air conditioner is running, the target pressure of the outdoor unit and the refrigerant flow rate of the terminal air conditioner can be automatically adjusted to ensure the cooling/heating effect of the entire multi-connected air conditioner is balanced.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained according to the content of the embodiment of the present invention and these drawings without any creative effort.

Fig. 1 is a flow chart of the multi-connected air-conditioning pipeline balancing method described in Embodiment 1 of the present invention;

Fig. 2 is a flow chart of obtaining air pressure parameters in the multi-connected air-conditioning pipeline balancing method described in Embodiment 2 of the present invention;

Fig. 3 is a control flow chart for realizing pipeline balance in the multi-connected air conditioner pipeline balance method described in Embodiment 2 of the present invention;

Fig. 4 is a system structural diagram of the multi-connected air conditioner described in Embodiment 3 of the present invention;

Fig. 5 is a schematic diagram of the installation structure of the multi-connected air conditioner described in Embodiment 3 of the present invention.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only the technical solutions of the present invention. Some, but not all, embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

Embodiment one

Figure 1 is a flow chart of the multi-connected air conditioner pipeline balancing method described in this embodiment. This embodiment is applicable to the situation where there are different height differences between the air-conditioning outdoor unit and each air-conditioning indoor unit of the multi-connected air conditioner. The realization of this embodiment It is required to obtain the air pressure and voltage values of the outdoor unit of the air conditioner and the indoor units of the air conditioner in the multi-connected air conditioner. The method disclosed in this embodiment can be executed by the control module of the multi-connected air conditioner, wherein the control module can be deployed on the outdoor unit of the air conditioner. It can also be deployed on the indoor unit of the air conditioner, which can be a hardware device or a software program. As shown in Figure 1, the multi-connected air conditioner pipeline balancing method described in this embodiment includes:

S101. Before the operation of the multi-connected air conditioner, acquire the air pressure voltage value of the air conditioner outdoor unit and the air pressure voltage value of each air conditioner indoor unit.

Those skilled in the art need to be clear that in order to avoid the problem of inaccurately obtained air pressure and voltage values due to air pressure changes caused by the operation of the fans of the whole machine, this embodiment requires obtaining the air pressure and voltage values of the air conditioner outdoor units and the air conditioner indoor units The step of the air pressure voltage value needs to be obtained when the multi-connected air conditioner unit is powered on but not started. There are no specific methods for obtaining the air pressure and voltage values of the air conditioner outdoor unit and each air conditioner indoor unit, including but not limited to obtaining through an air pressure sensor.

S102. According to the air pressure voltage value of the air conditioner outdoor unit and the air pressure voltage values of each air conditioner indoor unit, respectively calculate the difference in air pressure voltage value between the air conditioner outdoor unit and each air conditioner indoor unit.

The difference between the air pressure voltage value of each air conditioner indoor unit and the air pressure voltage value of the air conditioner outdoor unit is calculated respectively.

S103. Determine height differences between the air conditioner outdoor unit and each air conditioner indoor unit respectively according to the difference in air pressure and voltage between the air conditioner outdoor unit and each air conditioner indoor unit.

The difference between the air pressure and voltage values of each air conditioner indoor unit and the air conditioner outdoor unit has a corresponding relationship with the difference between the height values of each air conditioner indoor unit and air conditioner outdoor unit. The difference is converted into a height difference, and the height difference between each air-conditioning indoor unit and air-conditioning outdoor unit is obtained through the difference of the air pressure and voltage values obtained in step S102.

For example, the absolute value of the air pressure voltage difference between the air conditioner outdoor unit and the air conditioner indoor unit 1 is 0.2 volts. According to a specific formula set in advance, it can be calculated that the height difference between the air conditioner outdoor unit and the air conditioner indoor unit is 2 meters.

S104. Adjust the target pressure of the air conditioner outdoor unit and the refrigerant flow rate of each air conditioner indoor unit according to the determined height differences, so as to balance the pipelines when the multi-connected air conditioner is in operation.

The target pressure of the outdoor unit of the air conditioner will be different due to the number, setting and ambient temperature of the indoor unit of the air conditioner. According to the height difference between the outdoor unit of the air conditioner and each indoor unit of the air conditioner, the working target pressure of the outdoor unit of the air conditioner is compensated and adjusted, for example, Every time the maximum difference between the outdoor unit of the air conditioner and any indoor unit of the air conditioner exceeds 20 meters, add 2 kg to the target pressure of the outdoor unit of the air conditioner. In this way, it can be ensured that under the condition of different height differences, the working effect of each air conditioner indoor unit is basically the same, and there is no obvious attenuation.

For example, there are 5 air-conditioning indoor units in a multi-connected system. The height difference between the air-conditioning outdoor unit and each air-conditioning indoor unit can be calculated as 10 meters, 20 meters, 30 meters, 40 meters, and 50 meters. Thermal effect, when the unit is heating and running, the outdoor air conditioner will correct the maximum opening of the electronic expansion valve on the basis of the original maximum allowable opening, and the values are -200 steps, -150 steps, -100 steps, -50 steps , 0 step, doing so will reduce the refrigerant flow rate of the air conditioner indoor unit close to the air conditioner outdoor unit, increase the refrigerant flow rate of the terminal air conditioner indoor unit, and achieve the purpose of balancing the effect.

Each air-conditioning indoor unit is equipped with a flow regulation module for adjusting the flow of refrigerant, and the flow regulation module includes but is not limited to one or more than one electronic expansion valve.

The technical solution of this embodiment obtains the air pressure voltage value of the air conditioner outdoor unit and the air pressure voltage value of each air conditioner indoor unit before the operation of the multi-connected air conditioner, and then calculates the air pressure voltage between the air conditioner outdoor unit and each air conditioner indoor unit respectively. air-conditioning outdoor unit and each air-conditioning indoor unit, and then adjust the target pressure of the air-conditioning outdoor unit and the refrigerant flow rate of each air-conditioning indoor unit according to the determined height differences, In order to balance the pipelines when the multi-connected air conditioner is running, the target pressure of the outdoor unit and the refrigerant flow rate of the terminal air conditioner can be automatically adjusted to ensure a balanced cooling/heating effect of the entire multi-connected air conditioner.

Embodiment two

Fig. 2 is a flow chart of obtaining air pressure parameters in the multi-connected air-conditioning pipeline balancing method described in Embodiment 2 of the present invention. As shown in Fig. 2, the method for obtaining air pressure parameters described in this embodiment includes:

S201, the air conditioning unit is powered on.

S202. The air pressure detection module detects atmospheric pressure.

The air pressure detection module described in this embodiment includes an air pressure detection module installed on the outdoor unit of the air conditioner and an air pressure detection module (including but not limited to an air pressure sensor) installed on each air conditioner indoor unit. Obtain the atmospheric pressure of the space where the air-conditioning outdoor unit is located, and obtain the atmospheric pressure of the space where each air-conditioning indoor unit is located through the air pressure detection module installed on the air-conditioning indoor unit. The air pressure monitoring module converts all the detected air pressure and voltage values into voltage values for use in Finally, the height difference between each air conditioner indoor unit and the air conditioner outdoor unit is obtained.

S203. Send the detection result to the air conditioner inner board/air conditioner outer board through UART or I2C communication.

In this embodiment, the outdoor unit of the air conditioner and the air pressure detection module installed on the outdoor unit of the air conditioner are connected via a UART (Universal Asynchronous Receiver/Transmitter), or a two-wire serial bus I2C (Inter-Integrated Circuit) developed by PHILIPS. ) standard for communication, the air pressure detection module installed on the air conditioner outdoor unit sends the detected air pressure and voltage values to the air conditioner outdoor unit, and each air pressure detection module installed on each air conditioner indoor unit sends the detected air pressure and voltage values to the corresponding Air conditioner indoor unit.

S204, whether the collection has been completed 20 times, if yes, execute step S205, otherwise return to step S203.

Repeat the above steps 20 times. Of course, considering the accuracy and collection efficiency, the specific number of repeated collections can be adjusted according to the situation.

S205. The computer board calculates the average value of the air pressure and voltage values, and stores the average value, and at the same time, the air pressure detection module and the internal board stop data interaction, and end.

In order to reduce the impact of detection errors and make the collected air pressure and voltage values more accurate, average the data detected by each air pressure detection module in the previous step, calculate the average value, and end the collection work of the air pressure detection module.

Fig. 3 is a control flow chart for realizing pipeline balance in the multi-connected air conditioner pipeline balancing method described in Embodiment 2 of the present invention. As shown in Fig. 3, the control method for realizing pipeline balance described in this embodiment includes:

S301. The air conditioner outdoor unit obtains the air pressure and voltage values of all air conditioner indoor units.

In the multi-connected air conditioner, the outdoor unit of the air conditioner and each outdoor unit of the air conditioner can perform data communication (including wired communication or wireless communication). Air conditioner outdoor unit.

S302. Calculate the air pressure and voltage difference between the air conditioner outdoor unit and each air conditioner indoor unit.

The control module of the multi-connected air conditioner separately calculates the difference between the average air pressure voltage value of the air conditioner outdoor unit and the average air pressure voltage value of each air conditioner indoor unit.

S303. Calculate the corresponding height difference between the outdoor unit of the air conditioner and each indoor unit of the air conditioner according to the difference between the air pressure and voltage values.

The difference between the air pressure voltage value of each air conditioner indoor unit and the air conditioner outdoor unit has a corresponding relationship with the height difference between each air conditioner indoor unit and air conditioner outdoor unit. , the barometric voltage difference is converted into an altitude difference, and the altitude difference between each air-conditioning indoor unit and air-conditioning outdoor unit is obtained through the barometric voltage difference obtained in step S302.

S304. Whether the maximum height difference between the outdoor unit of the air conditioner and the indoor unit of the air conditioner meets the operating requirements of the unit; if so, execute step S305; otherwise, execute step S307.

Judging whether the maximum value of the height difference meets the operating requirements of the multi-connected air conditioner, and if not, controlling the shutdown of the multi-connected air conditioner and sending a fault message.

S305. Perform conversion according to the height difference between the outdoor unit of the air conditioner and each indoor unit of the air conditioner, and determine the target pressure of the outdoor unit of the air conditioner.

The target pressure of the outdoor unit of the air conditioner will be different due to the number, setting and ambient temperature of the indoor unit. According to the height difference between the outdoor unit of the air conditioner and each indoor unit of the air conditioner, the working target pressure of the outdoor unit of the air conditioner is compensated and adjusted. For example, the air conditioner Every time the maximum difference between the outdoor unit and any air conditioner indoor unit exceeds 20 meters, add 2kg to the target pressure of the air conditioner outdoor unit, and at the same time determine the height difference between the air conditioner outdoor unit and each air conditioner indoor unit In this way, it can be ensured that under different height differences, the working effect of each air conditioner indoor unit is basically the same, and there is no obvious attenuation.

For example, there are 5 air-conditioning indoor units in a multi-connection system, and the height difference between the air-conditioning outdoor unit and each air-conditioning indoor unit can be calculated as 10 meters, 20 meters, 30 meters, 40 meters, and 50 meters. The heating effect of the unit. When the multi-connected unit is in heating operation, the outdoor air conditioner will correct the maximum opening of the electronic expansion valve on the basis of the original maximum allowable opening. The values are -200 steps, -150 steps, and -100 steps respectively. , -50 steps, 0 steps, doing so will reduce the refrigerant flow rate of the air conditioner indoor unit close to the air conditioner outdoor unit, increase the refrigerant flow rate of the terminal air conditioner indoor unit, and achieve the purpose of balancing the effect.

S306. According to the height difference between the outdoor unit of the air conditioner and each indoor unit of the air conditioner, the outdoor unit of the air conditioner determines the maximum electronic expansion valve opening of the indoor unit of the air conditioner, and sends it to each indoor unit of the air conditioner through communication, and the indoor unit of the air conditioner stores it, and ends.

Each air-conditioning indoor unit is equipped with a flow regulation module, and the flow regulation module includes but is not limited to one or more than one electronic expansion valve. In the case that the flow adjustment module corresponding to each air conditioner indoor unit includes multiple electronic expansion valves, the control module of the multi-connected air conditioner adjusts the opening degrees of the multiple electronic expansion valves one by one or simultaneously to adjust the refrigerant flow out of the air conditioner indoor unit.

S307, shutdown, fault indication, end.

The control module of the multi-connected air conditioner controls the shutdown of the multi-connected air conditioner and sends fault information.

Compared with Embodiment 1, this embodiment adds a step of judging whether the maximum value of the height difference between the outdoor unit of the air conditioner and the indoor units of the air conditioner meets the operation requirements of the multi-connected air conditioner. In this judgment, if it does not meet, Then control the shutdown of the multi-connected air conditioner and send fault information. The technical solution described in this embodiment does not require manual setting. The air pressure sensor is used to automatically obtain the height difference between the air conditioner outdoor unit and each air conditioner indoor unit by detecting the difference in air pressure and voltage between the air conditioner outdoor unit and each air conditioner indoor unit, and then the outdoor The machine automatically adjusts the target pressure of the outdoor unit and the refrigerant flow rate of the terminal air conditioner according to the height difference, which can ensure the cooling/heating effect of the entire air conditioning unit is balanced.

Embodiment Three

Fig. 4 is a block diagram of the system structure of the multi-connected air conditioner described in Embodiment 3 of the present invention. As shown in Fig. 4, the multi-connected air conditioner system described in this embodiment includes a control module 401, an air conditioner outdoor unit 402, and at least one An indoor unit 403, and at least one electronic expansion valve 404, wherein each air conditioner indoor unit 403 corresponds to an electronic expansion valve 404;

The control module 401 is used for:

Before the operation of the multi-connected air conditioner, obtain the air pressure voltage value of the air conditioner outdoor unit 402 and the air pressure voltage value of each air conditioner indoor unit 403;

According to the air pressure voltage value of the air conditioner outdoor unit 402 and the air pressure voltage values of each air conditioner indoor unit 403, respectively calculate the difference in air pressure voltage value between the air conditioner outdoor unit 402 and each air conditioner indoor unit 403;

Determine the height difference between the air conditioner outdoor unit 402 and each air conditioner indoor unit 403 respectively according to the difference in air pressure and voltage between the air conditioner outdoor unit 402 and each of the air conditioner indoor units 403;

Adjust the target pressure of the air conditioner outdoor unit 402 and the opening degree of the electronic expansion valve 404 corresponding to each air conditioner indoor unit 403 according to the determined height differences, so as to balance the pipelines when the multi-connected air conditioner is in operation.

Further, the control module 401 is also used for: according to the difference between the air pressure and voltage values between the air conditioner outdoor unit 402 and the air conditioner indoor units 403, respectively determine the air conditioner outdoor unit 402 and each air conditioner indoor unit After adjusting the height difference of the air conditioner 403, before adjusting the target pressure of the air conditioner outdoor unit 402 and the opening degree of the electronic expansion valve 404 corresponding to each air conditioner indoor unit 403 according to the determined height difference, determine whether the determined height difference Whether the maximum value of meets the operating requirements of the multi-connected air conditioner;

When it is determined that the maximum value of the determined height differences meets the operating requirements of the multi-connected air conditioner, adjust the target pressure of the air conditioner outdoor unit 402 and the corresponding pressure of each air conditioner indoor unit 403 according to each determined height difference. The opening degree of the electronic expansion valve 404.

Further, the control module 401 is further configured to: when judging that the maximum value of the determined height differences does not meet the operation requirements of the multi-connected air conditioner, control the shutdown of the multi-connected air conditioner and send fault information.

Further, the multi-connected air conditioner also includes an air pressure detection module 406 installed on the outdoor unit of the air conditioner, and an air pressure detection module 406 installed on each indoor unit of the air conditioner; the control module 401 is specifically used for:

After the multi-connected air conditioner is powered on and before the multi-connected air conditioner is running, the air pressure detection module 405 installed on the air conditioner outdoor unit 402 controlling the multi-connected air conditioner obtains the air pressure and voltage value of the air conditioner outdoor unit 402, and controls the The air pressure detection module 406 installed on each air-conditioning indoor unit 403 of the multi-connection system obtains the air pressure and voltage values of each air-conditioning indoor unit 403 .

Further, the air pressure detection module 405 installed on the air conditioner outdoor unit 402 and the air pressure detection module 406 installed on the air conditioner indoor unit 403 are air pressure sensors.

Fig. 5 is a schematic diagram of the installation structure of the multi-connected air conditioner described in Embodiment 3 of the present invention. It can be seen from Fig. 5 that compared with the prior art, the hardware of the multi-connected air conditioner described in this embodiment is different from that of the prior art The main difference is that air pressure detection modules useful for detecting air pressure are respectively installed on the air conditioner outdoor unit and each air conditioner indoor unit.

The multi-connected air conditioner described in the technical solution of this embodiment includes a control module, an air conditioner outdoor unit, at least one air conditioner indoor unit, and at least one electronic expansion valve, wherein each air conditioner indoor unit corresponds to an electronic expansion valve, through the control Before the operation of the multi-connected air conditioner, the module obtains the air pressure voltage value of the air conditioner outdoor unit and the air pressure voltage value of each air conditioner indoor unit, and then calculates the difference between the air conditioner outdoor unit and each air conditioner indoor unit respectively, and then Obtain the height difference between the air conditioner outdoor unit and each air conditioner indoor unit, and then adjust the target pressure of the air conditioner outdoor unit and the refrigerant flow rate of each air conditioner indoor unit according to the determined height differences, so that the multi-connected air conditioner operates Timely pipeline balance can automatically adjust the target pressure of the outdoor unit and the refrigerant flow rate of the terminal air conditioner to ensure the cooling/heating effect of the entire multi-connected air conditioner is balanced.

All or part of the technical solutions provided by the above embodiments can be realized by software programming, and the software program is stored in a readable storage medium, such as a hard disk, an optical disk or a floppy disk in a computer.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (10)

1. a kind of combined air conditioners pipeline balance method, which is characterized in that including：

Before combined air conditioners operating, the air pressure voltage value of air-conditioner outdoor unit and the air pressure voltage value of each air conditioner indoor unit are obtained；

According to the air pressure voltage value of the air pressure voltage value of the air-conditioner outdoor unit and each air conditioner indoor unit, calculate separately described The difference of air pressure voltage value between air-conditioner outdoor unit and each air conditioner indoor unit；

According to the difference of the air pressure voltage value between the air-conditioner outdoor unit and each air conditioner indoor unit, the sky is determined respectively Adjust the difference in height of outdoor unit and each air conditioner indoor unit；

The cold medium flux of the goal pressure and each air conditioner indoor unit of the air-conditioner outdoor unit is adjusted according to each difference in height determined, So that pipeline balances when the combined air conditioners operating.

2. combined air conditioners pipeline balance method as described in claim 1, which is characterized in that described according to outside the air conditioning chamber The difference of air pressure voltage value between machine and each air conditioner indoor unit determines in the air-conditioner outdoor unit and each air conditioning chamber respectively After the step of difference in height of machine and each difference in height that the basis is determined adjust the air-conditioner outdoor unit goal pressure and Further include before the step of cold medium flux of each air conditioner indoor unit：

Judge whether the maximum value in each difference in height determined meets the running requirements of the combined air conditioners；

Each difference in height that the basis is determined adjusts the refrigerant of the goal pressure and each air conditioner indoor unit of the air-conditioner outdoor unit Flow includes：When the maximum value in judging each difference in height determined meets the running requirements of the combined air conditioners, root The cold medium flux of the goal pressure and each air conditioner indoor unit of the air-conditioner outdoor unit is adjusted according to each difference in height determined.

3. combined air conditioners pipeline balance method as claimed in claim 2, which is characterized in that further comprise：

When the maximum value in judging each difference in height determined does not meet the running requirements of the combined air conditioners, institute is controlled Combined air conditioners are stated to shut down and send fault message.

4. combined air conditioners pipeline balance method as described in claim 1, which is characterized in that operate it in the combined air conditioners Before, obtain air-conditioner outdoor unit air pressure voltage value and each air conditioner indoor unit air pressure voltage value the step of specifically include：

After the combined air conditioners power on and before combined air conditioners operating, on the air-conditioner outdoor unit that controls the combined air conditioners The air pressure detection module installed obtains the air pressure voltage value of the air-conditioner outdoor unit, controls each air conditioning chamber of the combined air conditioners The air pressure detection module installed on interior machine obtains the air pressure voltage value of each air conditioner indoor unit.

5. combined air conditioners pipeline balance method as claimed in claim 4, which is characterized in that the air pressure detection module is air pressure Sensor.

6. combined air conditioners pipeline balance method as described in claim 1, which is characterized in that each height that the basis is determined Difference adjust the air-conditioner outdoor unit goal pressure and each air conditioner indoor unit cold medium flux the step of be specially：According to determining Each difference in height adjust the aperture of the goal pressure of the air-conditioner outdoor unit and the electric expansion valve of each air conditioner indoor unit.

7. a kind of combined air conditioners, which is characterized in that including control module, air-conditioner outdoor unit, an at least air conditioner indoor unit and At least one electric expansion valve, wherein every air conditioner indoor unit corresponds to an electric expansion valve；

The control module is used for：

Before combined air conditioners operating, the air pressure voltage value of air-conditioner outdoor unit and the air pressure voltage of each air conditioner indoor unit are obtained Value；

According to the air pressure voltage value of the air pressure voltage value of the air-conditioner outdoor unit and each air conditioner indoor unit, calculate separately described The difference of air pressure voltage value between air-conditioner outdoor unit and each air conditioner indoor unit；

According to the difference of the air pressure voltage value between the air-conditioner outdoor unit and each air conditioner indoor unit, the sky is determined respectively Adjust the difference in height of outdoor unit and each air conditioner indoor unit；

The goal pressure and the corresponding electronics of each air conditioner indoor unit of the air-conditioner outdoor unit are adjusted according to each difference in height determined The aperture of expansion valve, so that pipeline balances when the combined air conditioners operate.

8. combined air conditioners as claimed in claim 7, which is characterized in that the control module is additionally operable to：According to the air-conditioning The difference of air pressure voltage value between outdoor unit and each air conditioner indoor unit determines the air-conditioner outdoor unit and each air-conditioning respectively After the difference in height of indoor unit, the goal pressure of the air-conditioner outdoor unit and each air-conditioning are being adjusted according to each difference in height determined Before the aperture of the corresponding electric expansion valve of indoor unit, it is described more to judge whether the maximum value in each difference in height determined meets Join the running requirements of air-conditioning；

When the maximum value in judging each difference in height determined meets the running requirements of the combined air conditioners, according to determination Each difference in height gone out adjusts the aperture of the goal pressure and the corresponding electric expansion valve of each air conditioner indoor unit of the air-conditioner outdoor unit.

9. combined air conditioners as claimed in claim 8, which is characterized in that the control module is additionally operable to：It is determined in judgement When maximum value in each difference in height does not meet the running requirements of the combined air conditioners, controls the combined air conditioners and shut down concurrently Send fault message.

10. combined air conditioners as claimed in claim 7, which is characterized in that the combined air conditioners further include being mounted on outside air conditioning chamber Air pressure detection module on machine, the air pressure detection module being mounted on each air conditioner indoor unit；The control module is specifically used for：

After the combined air conditioners power on and before combined air conditioners operating, on the air-conditioner outdoor unit that controls the combined air conditioners The air pressure detection module installed obtains the air pressure voltage value of the air-conditioner outdoor unit, controls each air conditioning chamber of the combined air conditioners The air pressure detection module installed on interior machine obtains the air pressure voltage value of each air conditioner indoor unit.