CN114688689B - A method and device for adjusting the opening of an electronic expansion valve, and a multi-connected air conditioner - Google Patents

Abstract

The invention provides an opening degree adjusting method and device of an electronic expansion valve and a multi-connected air conditioner, and relates to the technical field of air conditioners. The opening degree adjusting method of the electronic expansion valve comprises the following steps: calculating the superheat degree of the indoor unit according to the inlet pipe temperature value and the outlet pipe temperature value; if the superheat degree is not in the interval of the first preset value and the second preset value, calculating the initial adjustment step number of the electronic expansion valve of the overheat indoor unit according to the superheat degree; acquiring the number of the overheated indoor units; calculating the target regulation step number of the overheat indoor unit according to the correction coefficient and the initial regulation step number of the overheat indoor unit; and adjusting the opening of the electronic expansion valve of the overheating indoor unit according to the target adjusting step number corresponding to the overheating indoor unit. The initial regulation step number is corrected through the quantity of the overheated indoor units to obtain the target regulation step number, so that the temperature and pressure fluctuation of the whole multi-connected air conditioner system can be reduced, the stability of the compressor is kept, the stability of the air outlet temperature of the indoor units is improved, and the comfort level of users is improved.

Description

A method and device for adjusting the opening of an electronic expansion valve, and a multi-connected air conditioner

technical field

The invention relates to the technical field of air conditioners, in particular to a method and device for adjusting the opening of an electronic expansion valve and a multi-connected air conditioner.

Background technique

The multi-connected air conditioner has multiple indoor units, and each indoor unit has an independent electronic expansion valve, and each electronic expansion valve is adjusted according to the temperature change of the heat exchanger of the respective indoor unit.

Usually, the adjustment cycle of the electronic expansion valve of the indoor unit matched with an outdoor unit is the same. When the indoor units are running at the same time, the electronic expansion valves of multiple indoor units may Simultaneously increasing or decreasing the opening of the valve will cause fluctuations in the temperature, pressure and other parameters of the system. Especially when there are many indoor units, it may even cause the compressor to run unstable, and the outlet air temperature of the indoor unit will also fluctuate accordingly. Comfortable Poor sex.

Contents of the invention

The problem to be solved by the invention is how to keep the compressor running stably and keep the air outlet temperature of the indoor unit at high temperature, so as to improve the stability of the whole machine.

In order to solve the above problems, the present invention provides a method and device for adjusting the opening of an electronic expansion valve, and a multi-connected air conditioner.

In the first aspect, the embodiment of the present invention provides a method for adjusting the opening of an electronic expansion valve, which is applied to a multi-connected air conditioner. The multi-connected air conditioner includes an outdoor unit and a plurality of indoor units. The indoor units are connected in parallel, the indoor unit includes a heat exchanger and an electronic expansion valve, the indoor unit is connected to the outdoor unit through the electronic expansion valve, and the opening adjustment method of the electronic expansion valve includes:

Obtaining the temperature value of the inlet pipe and the temperature value of the outlet pipe of the heat exchanger of the indoor unit under the condition of cooling mode;

calculating the degree of superheat of the indoor unit according to the inlet pipe temperature value and the outlet pipe temperature value;

judging whether the degree of superheat is within a range between a first preset value and a second preset value; wherein, the first preset value is smaller than the second preset value;

If the degree of superheat is not within the interval between the first preset value and the second preset value, calculate the initial adjustment steps of the electronic expansion valve of the overheated indoor unit according to the degree of superheat; wherein, the The overheated indoor unit indicates an indoor unit whose degree of superheat is not within the interval between the first preset value and the second preset value;

Obtain the number of overheated indoor units;

calculating a correction coefficient according to the quantity of the overheated indoor units;

calculating the target adjustment steps of the overheated indoor unit according to the correction coefficient and the initial adjustment steps of the overheated indoor unit;

The opening degree of the electronic expansion valve of the overheated indoor unit is adjusted according to the target adjustment step number corresponding to the overheated indoor unit.

When the degree of superheat is not within the interval between the first preset value and the second preset value, the number of overheated indoor units is used to correct the initial adjustment steps to obtain the target adjustment steps, which can reduce the temperature and the temperature of the entire multi-connected air conditioner system. Pressure fluctuations, maintain the stability of the compressor, improve the stability of the air outlet temperature of the indoor unit, so as to improve the comfort of the user.

In an optional embodiment of the present invention, the step of judging whether the degree of superheat is within the interval between the first preset value and the second preset value includes:

judging whether the degree of superheat is less than the first preset value;

judging whether the number of overheated indoor units is greater than or equal to a set number;

If the degree of superheat is less than the first preset value and the number of the overheated indoor units is greater than or equal to the set number, adjust the The steps for determining the opening degree of the electronic expansion valve of the engine include:

judging whether the target number of adjustment steps is less than a first set parameter; if the target number of adjustment steps of some of the overheated indoor units is less than the first set parameter, control the target number of adjustment steps to be less than the first set parameter The opening degree of the electronic expansion valve of the overheated indoor unit of the first set parameter remains unchanged.

In an optional embodiment of the present invention, the step of adjusting the opening degree of the electronic expansion valve of the overheated indoor unit according to the target adjustment steps corresponding to the overheated indoor unit further includes:

If the target adjustment steps of all the overheated indoor units whose superheat degrees are less than the first preset value are all less than the first set parameter, then according to the superheat degree adjustment of the overheated indoor units The opening degree of the electronic expansion valve.

In an optional embodiment of the present invention, the step of adjusting the opening degree of the corresponding electronic expansion valve according to the degree of superheat of the overheated indoor unit includes:

Controlling the electronic expansion valve of the overheated indoor unit with the smallest degree of superheat to decrease the corresponding initial adjustment steps;

Controlling the opening degrees of the electronic expansion valves of other overheated indoor units whose superheat degrees are less than the first preset value and whose target adjustment steps are less than the first set parameter remains unchanged.

In an optional embodiment of the present invention, the step of controlling the initial adjustment steps corresponding to the electronic expansion valve adjustment of the overheated indoor unit with the smallest degree of superheat includes:

If there are multiple overheated indoor units whose superheat degree is smaller than the first preset value and the superheat degree is the smallest, obtain the corresponding indoor ambient temperature value of the overheated indoor unit;

The overheated indoor unit with the lowest ambient temperature value is controlled first to adjust the opening degree of the electronic expansion valve.

In an optional embodiment of the present invention, the step of adjusting the opening degree of the electronic expansion valve of the overheated indoor unit according to the target adjustment steps corresponding to the overheated indoor unit further includes:

Controlling the electronic expansion valve of the overheated indoor unit whose superheat degree is less than the first preset value and whose target adjustment step is greater than or equal to the first set parameter, reduces the target adjustment step.

In an optional embodiment of the present invention, the step of judging whether the degree of superheat is within the interval between the first preset value and the second preset value includes:

judging whether the degree of superheat is greater than the second preset value;

judging whether the number of overheated indoor units is greater than or equal to a set number;

If the degree of superheat is greater than the second preset value and the number of the overheated indoor units is greater than or equal to the set number, adjust the The steps for determining the opening degree of the electronic expansion valve of the engine include:

judging whether the target number of adjustment steps is less than the second set parameter;

If the target adjustment steps of some of the overheated indoor units are smaller than the second set parameter, control the electronic expansion valves of the overheated indoor units whose target adjustment steps are smaller than the second set parameter The opening remains the same.

In an optional embodiment of the present invention, the step of adjusting the opening degree of the electronic expansion valve of the overheated indoor unit according to the target adjustment steps corresponding to the overheated indoor unit further includes:

If the target adjustment steps of all overheated indoor units whose superheat degrees are greater than the second preset value are less than the second set parameter, adjust the corresponding The opening degree of the electronic expansion valve.

In an optional embodiment of the present invention, the step of adjusting the opening degree of the corresponding electronic expansion valve according to the degree of superheat of the overheated indoor unit includes:

Controlling the electronic expansion valve of the overheated indoor unit with the highest degree of superheat to increase the corresponding initial adjustment steps;

Controlling the opening degrees of the electronic expansion valves of other overheated indoor units whose superheat degrees are greater than the second preset value and whose target adjustment steps are less than the second set parameter remains unchanged.

In an optional embodiment of the present invention, the step of controlling the initial adjustment steps corresponding to the electronic expansion valve of the overheated indoor unit with the highest superheated degree includes:

If there are multiple overheated indoor units whose superheat degree is greater than the second preset value and the superheat degree is the smallest, obtain the corresponding indoor ambient temperature value of the overheated indoor unit;

The overheated indoor unit with the highest ambient temperature value is controlled first to adjust the opening degree of the electronic expansion valve.

In an optional embodiment of the present invention, the step of adjusting the opening degree of the electronic expansion valve of the overheated indoor unit according to the target adjustment steps corresponding to the overheated indoor unit further includes:

Controlling the electronic expansion valve of the overheated indoor unit whose superheat degree is greater than the second preset value and the target adjustment step number is greater than or equal to the second set parameter increases the target adjustment step number.

In an optional embodiment of the present invention, the method for adjusting the opening of the electronic expansion valve includes:

If the degree of superheat is less than the first preset value, control the opening degree of the corresponding electronic expansion valve to decrease;

If the degree of superheat is greater than the second preset value, controlling the opening degree of the corresponding electronic expansion valve to increase;

If the degree of superheat is greater than or equal to the first preset value and less than or equal to the second preset value, the corresponding opening degree of the electronic expansion valve is controlled to remain unchanged.

In the second aspect, the embodiment of the present invention provides an opening adjustment device for an electronic expansion valve, which is applied to a multi-connected air conditioner. The multi-connected air conditioner includes an outdoor unit and a plurality of indoor units. The indoor unit is connected in parallel, the indoor unit includes a heat exchanger and an electronic expansion valve, the indoor unit is connected to the outdoor unit through the electronic expansion valve, and the opening adjustment device method of the electronic expansion valve includes:

The first acquisition module is configured to acquire the inlet pipe temperature value and the outlet pipe temperature value of the heat exchanger of the indoor unit under the condition of cooling mode;

A first calculation module, configured to calculate the superheat of the indoor unit according to the inlet pipe temperature and the outlet pipe temperature;

A judging module, configured to judge whether the degree of superheat is within a range between a first preset value and a second preset value; wherein, the first preset value is smaller than the second preset value;

The second calculation module is used to calculate the initial value of the electronic expansion valve of the overheated indoor unit according to the superheat degree if the superheat degree is not within the interval between the first preset value and the second preset value. The number of adjustment steps; wherein, the overheated indoor unit indicates an indoor unit whose superheat degree is not within the interval between the first preset value and the second preset value;

The second obtaining module is used to obtain the quantity of overheated indoor units;

a third calculation module, configured to calculate a correction coefficient according to the number of overheated indoor units;

A fourth calculation module, configured to calculate the target adjustment steps of the overheated indoor unit according to the correction coefficient and the initial adjustment steps of the overheated indoor unit;

A control module, configured to adjust the opening degree of the electronic expansion valve of the overheated indoor unit according to the target adjustment steps corresponding to the overheated indoor unit.

In a third aspect, an embodiment of the present invention provides a multi-connected air conditioner, including a controller for executing computer instructions to implement the method for adjusting the opening of the electronic expansion valve provided in the first aspect.

Description of drawings

Fig. 1 is a schematic structural diagram of a multi-connected air conditioner provided by an embodiment of the present invention.

Fig. 2 is a flowchart of a method for adjusting the opening of an electronic expansion valve according to the first embodiment of the present invention.

Fig. 3 is a partial flow chart of the method for adjusting the opening of the electronic expansion valve provided by the second embodiment of the present invention.

Fig. 4 is a flow chart of the sub-steps of step S350 of the method for adjusting the opening degree of the electronic expansion valve provided by the second embodiment of the present invention.

Fig. 5 is a partial flow chart of the method for adjusting the opening of the electronic expansion valve provided by the second embodiment of the present invention.

Fig. 6 is a flow chart of the sub-steps of step S450 of the method for adjusting the opening degree of the electronic expansion valve provided by the second embodiment of the present invention.

Fig. 7 is a block diagram of an opening adjustment device for an electronic expansion valve provided by an embodiment of the present invention.

Explanation of reference signs:

10-multi-connected air conditioner; 11-indoor unit; 12-heat exchanger; 13-electronic expansion valve; 14-inlet pipe temperature sensor; 15-outlet pipe temperature sensor; 16-ambient temperature sensor; 17-overheated indoor unit ;20-the opening adjustment device of the electronic expansion valve; 21-the first acquisition module; 22-the first calculation module; 23-the judgment module; 24-the second calculation module; 25-the second acquisition module; 26-the third calculation module; 27-fourth calculation module; 28-control module.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

first embodiment

Please refer to Fig. 1. This embodiment provides a method for adjusting the opening of the electronic expansion valve 13. The method for adjusting the opening of the electronic expansion valve 13 provided by this embodiment is mainly applied to a multi-connected air conditioner 10. This embodiment provides The method for adjusting the opening of the electronic expansion valve 13 can reduce the temperature and pressure fluctuations of the entire multi-connected air conditioner 10 system, maintain the stability of the compressor, and improve the stability of the air outlet temperature of the indoor unit 11, so as to improve user satisfaction. comfort.

Among them, the multi-connected air conditioner 10 includes an outdoor unit and a plurality of indoor units 11. The plurality of indoor units 11 are connected in parallel. The indoor unit 11 includes a heat exchanger 12 and an electronic expansion valve 13. The indoor unit 11 is connected to the outdoor unit through the electronic expansion valve 13. connect. The indoor unit 11 also includes an inlet pipe temperature sensor 14, an outlet pipe temperature sensor 15, an ambient temperature sensor 16 and a controller, and the inlet pipe temperature sensor 14, the outlet pipe temperature sensor 15, and the ambient temperature sensor 16 are all electrically connected to the controller. The inlet pipe temperature value sensor is arranged on the inlet pipe of the refrigerant to detect the inlet pipe temperature value. The outlet pipe temperature sensor 15 is arranged on the refrigerant outflow pipe for detecting the pipe temperature value. The ambient temperature sensor 16 is used to detect the ambient temperature value. The controller executes the opening adjustment method of the electronic expansion valve 13 after receiving the inlet pipe temperature value, the outlet pipe temperature value and the ambient temperature value.

Please refer to Fig. 2, the specific flow of the method for adjusting the opening of the electronic expansion valve 13 provided in this embodiment is as follows:

Step S11 , under the condition of cooling mode, the inlet pipe temperature value and the outlet pipe temperature value of the heat exchanger 12 of the indoor unit 11 are acquired.

The method for adjusting the opening of the electronic expansion valve 13 provided in this embodiment is mainly applied in the cooling mode. When the multi-connected air conditioner 10 is running in the cooling mode, the inlet pipe temperature of the heat exchanger 12 of each indoor unit 11 is obtained. value and the outlet temperature value.

Step S12, calculating the superheat degree of the indoor unit 11 according to the inlet pipe temperature value and the outlet pipe temperature value.

In this embodiment, the superheat degree of each indoor unit 11 is calculated according to the inlet pipe temperature value and the outlet pipe temperature value, and the superheat degree is obtained by subtracting the inlet pipe temperature value from the outlet pipe temperature value.

It is easy to understand that the situation of each indoor unit 11 is the same, and each indoor unit 11 obtains its superheat degree by subtracting the temperature value of the inlet pipe from its outlet pipe temperature value.

Step S13 , judging whether the degree of superheat is within a range between a first preset value and a second preset value; wherein, the first preset value is smaller than the second preset value.

In this embodiment, the interval formed by the first preset value and the second preset value is the interval in which the multi-connected air conditioner 10 can operate stably. If the degree of superheat is less than the first preset value, it means that the superheat is too small. Insufficient evaporation of the refrigerant in machine 11 is prone to liquid return, causing hidden dangers to the operation of the compressor. If the degree of superheat is greater than the second preset value, it indicates that the refrigerant flow rate is insufficient and the cooling effect is not good. Therefore, it is necessary to judge whether the degree of superheat is within the range from the first preset value to the second preset value, so as to judge the multi-connected air conditioner. Whether the device 10 is functioning normally.

Wherein, the first preset value is -1°C~1°C. The second preset value is 2°C~5°C.

Step S14, if the degree of superheat is not within the interval between the first preset value and the second preset value, calculate the initial adjustment steps of the electronic expansion valve 13 of the overheated indoor unit 17 according to the degree of superheat. Wherein, the overheated indoor unit 17 refers to the indoor unit 11 whose superheat degree is not within the interval between the first preset value and the second preset value.

In this embodiment, when the degree of superheat is not within the interval between the first preset value and the second preset value, it is necessary to calculate the initial adjustment steps of the electronic expansion valve 13 of the overheated indoor unit 17, and adjust the overheated indoor unit 17, the initial adjustment steps of the electronic expansion valve 13 are used to adjust the refrigerant flow of the indoor unit 11 and ensure the normal use of the multi-connected air conditioner 10.

Wherein, for the convenience of description, the indoor units 11 whose superheat degree is not within the interval between the first preset value and the second preset value are defined as overheated indoor units 17 .

If the degree of superheat is not within the interval between the first preset value and the second preset value, then calculate the initial adjustment steps of the electronic expansion valve 13 of the overheated indoor unit 17, and the specific method is as follows:

in is the opening degree of the electronic expansion valve 13 of the jth indoor unit 11, /> It is the opening degree of the electronic expansion valve 13 in the previous adjustment cycle, if the current is the first adjustment cycle /> The value of S0 is the initial opening S0 (preferably 100~300pls), and the value of S0 can be determined according to the characteristics of the electronic expansion valve 13 and the maximum allowable opening; a1 and a2 are calculation coefficients (for example, 5~20), which can be Different values are determined by the experimental results; T0 is the preset target superheat (preferably 0~5°C), and TA≤T0≤TB.

Step S15, acquiring the number of overheated indoor units 17.

In this embodiment, the superheat degrees of multiple indoor units 11 are calculated one by one according to the method from step S11 to step S14, and the indoor units 11 whose superheat degrees are not within the interval between the first preset value and the second preset value, that is, the overheated indoor units The number of machines 17.

Step S16 , calculating a correction coefficient according to the number of overheated indoor units 17 .

In this embodiment, the number of overheated indoor units 17 is different, and the adjustment method of the electronic expansion valve 13 is different. If the number of overheated indoor units 17 is large, generally more than two overheated indoor units 17, that is, the overheated indoor unit 17 is considered to be overheated. If the number of overheated indoor units 17 is large, the simultaneous adjustment of the electronic expansion valves 13 of multiple overheated indoor units 17 will cause fluctuations in the flow rate of the whole machine, resulting in fluctuations in the frequency of the compressor. The correction coefficient is calculated according to the number of overheated indoor units 17, and the initial value is corrected according to the correction coefficient. Adjusting the number of steps can ensure the stability of the whole machine movement.

The correction factor is calculated according to the following formula:

n=k0*N and n≧1. Wherein, N is the number of overheated indoor units 17, and k0 is a proportional coefficient, which generally takes a value of 0~1. n is the correction factor. It should be noted that the value range of k0 is different under the two conditions that the degree of superheat is less than the first preset value and the degree of superheat is greater than the second preset value.

Step S17 , calculating the target adjustment steps of the overheated indoor unit 17 according to the correction coefficient and the initial adjustment steps of the overheated indoor unit 17 .

In this embodiment, the target adjustment steps of the superheated indoor unit 17 can be calculated according to the correction coefficient and the initial adjustment steps of the superheater, so as to adjust the opening degree of the electronic expansion valve 13 of the superheated indoor unit 17 .

Calculate the number of target adjustment steps according to the following formula:

S(j) ₀ =S(j)/n, where S(j) is the initial adjustment steps, and S(j) ₀ is the target adjustment steps.

Step S18 , adjusting the opening degree of the electronic expansion valve 13 of the overheating indoor unit 17 according to the target adjustment steps corresponding to the overheating indoor unit 17 .

In this embodiment, the opening degree of the electronic expansion valve 13 of each overheated indoor unit 17 is adjusted according to the target adjustment steps corresponding to the overheated indoor unit 17 .

It is easy to understand that if the degree of superheat is less than the first preset value, the opening degree of the corresponding electronic expansion valve 13 is controlled to decrease; if the degree of superheat is greater than the second preset value, the opening degree of the corresponding electronic expansion valve 13 is controlled increase; if the degree of superheat is greater than or equal to the first preset value and less than or equal to the second preset value, then the opening degree of the corresponding electronic expansion valve 13 is controlled to remain unchanged.

If the degree of superheat is less than the first preset value, it means that the current refrigerant evaporation is insufficient and the refrigerant flow rate is relatively large, so the opening degree of the electronic expansion valve 13 needs to be reduced. If the degree of superheat is greater than the second preset value, it means that the current flow rate of the refrigerant is relatively small and there is less refrigerant, and the opening degree of the electronic expansion valve 13 needs to be increased.

In the method for adjusting the opening of the electronic expansion valve 13 provided in this embodiment, when the degree of superheat is not within the interval between the first preset value and the second preset value, the number of overheated indoor units 17 is used to correct the initial adjustment steps to obtain the target Adjusting the number of steps can reduce temperature and pressure fluctuations of the entire multi-connected air conditioner 10 system, maintain the stability of the compressor, and improve the stability of the air outlet temperature of the indoor unit 11, so as to improve user comfort.

second embodiment

This embodiment provides a method for adjusting the opening of the electronic expansion valve 13. The method for adjusting the opening of the electronic expansion valve 13 provided by this embodiment can reduce the temperature and pressure fluctuations of the entire multi-connected air conditioner 10 system, and maintain compression The stability of the indoor unit improves the stability of the air outlet temperature of the indoor unit 11, so as to improve the comfort of the user.

Please refer to FIG. 3 , step S100 , the temperature value of the inlet pipe and the outlet pipe temperature value of the heat exchanger 12 of the indoor unit 11 are acquired under the condition of cooling mode.

In this embodiment, the working process and principle of step S100 are the same as those of step S11 in the first embodiment, and reference may be made to step S11 , which will not be repeated here.

Step S200, calculating the superheat degree of the indoor unit 11 according to the inlet pipe temperature value and the outlet pipe temperature value.

Likewise, the working process and working principle of step S200 are the same as those of step S12 in the first embodiment, and reference may be made to step S12, which will not be repeated here.

Step S310, judging whether the degree of superheat is less than a first preset value and judging whether the number of overheated indoor units is greater than or equal to a set number.

In this embodiment, it is judged whether the degree of superheat is less than the first preset value. The first preset value is the same as that in the first embodiment. If it is judged whether the degree of superheat is less than the first preset value, it can be determined Is the refrigerant in indoor unit 11 insufficiently evaporated and liquid returns, causing hidden dangers to the operation of the compressor?

The set number is 2. Generally, there are more than 2 overheated indoor units 17, that is, the number of overheated indoor units 17 is considered to be large, and the simultaneous adjustment of the electronic expansion valves 13 of multiple overheated indoor units 17 will cause the flow fluctuation of the whole machine. Causes compressor frequency to fluctuate.

Step S320, if the degree of superheat is less than the first preset value and it is determined whether the number of overheated indoor units 17 is greater than or equal to the set number, then it is determined whether the target number of adjustment steps is less than the first set parameter.

In this embodiment, if the degree of superheat is less than the first preset value, it means that the degree of superheat is too small, and the evaporation of the refrigerant in the indoor unit 11 is not sufficiently evaporated, and liquid return is likely to occur, causing hidden dangers to the operation of the compressor. Under the condition that the degree of superheat is less than the first preset value, it is necessary to further determine whether the target adjustment parameter is less than the first set parameter, so as to adjust the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 .

Wherein, the first setting parameter is 1.

Step S330, if there are some overheated indoor units 17 whose target adjustment steps are smaller than the first set parameter, then control the opening of the electronic expansion valve 13 of the overheated indoor unit 17 whose target adjustment step is smaller than the first set parameter to remain unchanged .

In this embodiment, if the target steps of some overheated indoor units 17 are smaller than the first set parameter, it means that the target adjustment steps of the overheated indoor units 17 are relatively small, whether to adjust the electronic expansion valve of the overheated indoor units 17 The opening degree of 13 has little influence on the whole system, so the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 may not be adjusted.

It should be noted that step S330 is applied to the condition that the number of target adjustment steps is greater than or equal to the first set parameter among the multiple overheated indoor units 17 whose superheat degrees are less than the first preset value, if all the overheated indoor units 17 If the number of target adjustment steps is less than the first set parameter, it will be executed according to step S340.

Step S340, if the target adjustment steps of all overheated indoor units 17 whose superheat degrees are less than the first preset value are less than the first set parameter, then reduce the opening of the corresponding electronic expansion valve 13 according to the superheat degrees of the overheated indoor units 17. Spend.

In this embodiment, if the target adjustment steps of all overheated indoor units 17 whose superheat degrees are less than the first preset value are less than the first set parameter, it means that all the overheated indoor units 17 whose superheat degrees are less than the first preset value If the number of target adjustment steps is small, it is necessary to further adjust the opening degree of each electronic expansion valve 13 according to the superheat degree of each overheated indoor unit 17 .

Step S350, controlling the electronic expansion valve 13 of the superheated indoor unit 17 with the smallest degree of superheat to reduce the corresponding initial adjustment steps.

In this embodiment, if there is only one overheated indoor unit 17 with the smallest superheated degree among the multiple overheated indoor units 17 whose superheated degree is smaller than the first preset value and whose target adjustment steps are smaller than the first set parameter, it means that the If the refrigerant flow rate of the indoor unit 11 is excessive, the opening of the electronic expansion valve 13 of the superheated indoor unit 17 is adjusted according to the initial adjustment steps of the superheated indoor unit 17 .

Please refer to FIG. 4 , wherein step S350 may include step S352 and step S354.

Step S352, if there are a plurality of overheated indoor units 17 whose superheat degree is smaller than the first preset value and the superheat degree is the smallest, obtain the indoor ambient temperature value of the corresponding overheated indoor unit 17.

In this embodiment, if there are multiple overheated indoor units 17 whose superheat degrees are smaller than the first preset value and the superheat degrees are the smallest, adjust the number of overheated indoor units 17 whose superheat degrees are less than the first preset value and the corresponding indoor ambient temperature values. The opening degree of the electronic expansion valve 13 of the superheated indoor unit 17 with the smallest degree of superheat.

In step S354, the overheated indoor unit 17 with the lowest ambient temperature value is controlled to adjust the opening degree of the electronic expansion valve 13 first.

In this embodiment, the overheated indoor unit 17 with the lowest ambient temperature value is installed first among the overheated indoor units 17 with the lowest superheated degree less than the first preset value and the number of initial adjustment steps is reduced. The opening degree of the electronic expansion valve 13 of 17.

If the ambient temperature value is the lowest, it means that the cooling load of the overheated indoor unit 17 is the smallest, and it is necessary to reduce the refrigerant flow rate first, because a small refrigerant flow rate can meet the cooling demand of the indoor unit 11, and reducing the opening of the expansion valve has a great impact on the use of Comfort is less affected.

Step S360, controlling the opening degrees of the electronic expansion valves 13 of other overheated indoor units 17 whose superheat degrees are less than the first preset value and whose target adjustment steps are less than the first set parameter to remain unchanged.

In this embodiment, if there are multiple overheated indoor units 17 with the smallest superheated degree less than the first preset value, only the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 with the smallest ambient temperature value is adjusted , the electronic expansion valves 13 of the remaining overheated indoor units 17 whose superheat degrees are smaller than the first preset value and whose superheat degrees are the smallest are not adjusted.

Step S370, controlling the electronic expansion valve 13 of the overheated indoor unit 17 whose superheat degree is less than the first preset value and the target adjustment step number is greater than or equal to the first set parameter to reduce the target adjustment step number.

In this embodiment, if the degree of superheat is less than the first preset value and the target adjustment steps are greater than or equal to the first set parameter, the electronic expansion valve 13 of the overheated indoor unit 17 is adjusted down according to the target adjustment steps.

It is easy to understand that step S310-step S370 is how to adjust the opening degree of the electronic expansion valve 13 for the overheated indoor unit 17 whose degree of superheat is less than the first preset value. Step S470 to adjust the opening degrees of the electronic expansion valves 13 of these overheated indoor units 17 .

Please refer to FIG. 5 , step S410 , judging whether the degree of superheat is greater than a second preset value and judging whether the number of overheated indoor units is greater than or equal to a set number.

In this embodiment, it is judged whether the degree of superheat is greater than the second preset value. The second preset value is the same as the second preset value in the first embodiment. If it is judged whether the degree of superheat is greater than the second preset value, it can be determined Is the refrigerant in indoor unit 11 insufficiently evaporated and liquid returns, causing hidden dangers to the operation of the compressor?

Step S420, if the degree of superheat is greater than a second preset value, it is determined whether the target number of adjustment steps is less than a second set parameter.

In this embodiment, if the degree of superheat is greater than the second preset value, it means that the superheat is too large, and the refrigerant in the indoor unit 11 indicates that the refrigerant flow rate is insufficient, and the cooling effect is not good. Next, it is necessary to further determine whether the target adjustment parameter is smaller than the second set parameter, so as to adjust the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 .

Step S430, if the target adjustment step number is smaller than the second set parameter, then control the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 whose target adjustment step number is smaller than the second set parameter to remain unchanged.

In this embodiment, if the target steps of some overheated indoor units 17 are smaller than the first set parameter, it means that the target adjustment steps of the overheated indoor units 17 are relatively small, and whether to adjust the electronic expansion valve of the overheated indoor units 17 The opening degree of 13 has little influence on the whole system, so the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 may not be adjusted.

It should be noted that step S430 is applied to the condition that the number of target adjustment steps is greater than or equal to the first set parameter among the multiple overheated indoor units 17 whose superheat degrees are less than the first preset value, if all the overheated indoor units 17 If the number of target adjustment steps is less than the first set parameter, then follow step S440.

Step S440, if the target adjustment steps of all overheated indoor units 17 whose superheat degrees are greater than the second preset value are less than the second set parameter, then adjust the opening degrees of the corresponding electronic expansion valves 13 according to the superheat degrees of the overheated indoor units 17 .

In this embodiment, if the target adjustment steps of all overheated indoor units 17 whose superheat degrees are greater than the second preset value are less than the first set parameter, it means that the target adjustment steps of all overheated indoor units 17 whose superheat degrees are lower than the first preset value If the number of target adjustment steps is small, it is necessary to further adjust the opening degree of each electronic expansion valve 13 according to the superheat degree of each overheated indoor unit 17 .

Step S450, controlling the electronic expansion valve 13 of the superheated indoor unit 17 with the highest degree of superheat to increase the corresponding initial adjustment steps.

In this embodiment, if there is only one overheated indoor unit 17 with the smallest superheated degree among the multiple overheated indoor units 17 whose superheated degree is smaller than the first preset value and whose target adjustment steps are smaller than the first set parameter, it means that the If the refrigerant demand of the indoor unit 11 is large, the opening of the electronic expansion valve 13 of the overheated indoor unit 17 is adjusted according to the initial adjustment steps of the overheated indoor unit 17 .

Please refer to FIG. 6 , wherein step S350 may include step S352 and step S354.

Step S452, if there are a plurality of overheated indoor units 17 whose superheat degree is greater than the second preset value and the superheat degree is the smallest, obtain the indoor ambient temperature value of the corresponding overheated indoor unit 17.

In this embodiment, if there are multiple overheated indoor units 17 whose superheat degrees are smaller than the first preset value and the superheat degrees are the smallest, then adjust the number of superheated indoor units 17 whose superheat degrees are less than the first preset value and the corresponding indoor ambient temperature values. The opening degree of the electronic expansion valve 13 of the superheated indoor unit 17 with the smallest degree of superheat.

In step S454, the overheated indoor unit 17 with the highest ambient temperature value is controlled to adjust the opening degree of the electronic expansion valve 13 first.

In this embodiment, among the multiple overheated indoor units 17 with the highest superheated degree greater than the second preset value, the overheated indoor unit 17 with the highest ambient temperature value is installed first and the number of initial adjustment steps is increased. The opening degree of the electronic expansion valve 13 of 17.

If the ambient temperature value is the highest, it means that the overheated indoor unit 17 has a large demand for refrigerant, and it is necessary to give priority to increasing the refrigerant flow rate, because a larger refrigerant flow rate can meet the cooling demand of the indoor unit 11 and improve user comfort. .

Step S460, controlling the opening degrees of the electronic expansion valves 13 of other overheated indoor units 17 whose superheat degrees are greater than the second preset value and whose target adjustment steps are less than the second set parameter to remain unchanged.

In this embodiment, when there are multiple overheated indoor units 17 with the highest degree of superheat greater than the second preset value, only the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 with the highest ambient temperature value is adjusted , the electronic expansion valves 13 of the remaining overheated indoor units 17 whose superheat degrees are greater than the second preset value and have the highest superheat degrees are not adjusted.

Step S470, controlling the electronic expansion valve 13 of the overheated indoor unit 17 whose superheat degree is greater than the second preset value and the target adjustment step number is greater than or equal to the second set parameter to increase the target adjustment step number.

Please refer to Fig. 7, the embodiment of the present invention also provides an electronic expansion valve opening adjustment device 20, which is applied to the multi-connected air conditioner 10, and the electronic expansion valve opening adjustment device 20 includes:

The first acquisition module 21 is configured to acquire the inlet pipe temperature value and the outlet pipe temperature value of the heat exchanger 12 of the indoor unit 11 under the condition of cooling mode.

Step S11 and Step S100 of the method for adjusting the opening of the electronic expansion valve 13 provided in the embodiment of the present invention may be executed by the first acquiring module 21 .

The first calculation module 22 is configured to calculate the superheat degree of the indoor unit 11 according to the inlet pipe temperature and the outlet pipe temperature.

Step S12 and Step S200 of the method for adjusting the opening of the electronic expansion valve 13 provided in the embodiment of the present invention can be executed by the first calculation module 22 .

The judging module 23 is used for judging whether the degree of superheat is within the interval between the first preset value and the second preset value.

Step S13 , step S310 and step S320 of the method for adjusting the opening of the electronic expansion valve 13 provided by the embodiment of the present invention may be executed by the judging module 23 .

The second calculation module 24 is used to calculate the initial adjustment steps of the electronic expansion valve 13 of the overheated indoor unit 17 according to the degree of superheat if the degree of superheat is not within the interval between the first preset value and the second preset value; The indoor unit 17 represents the indoor unit 11 whose degree of superheat is not within the interval between the first preset value and the second preset value.

Step S14 of the method for adjusting the opening of the electronic expansion valve 13 provided by the embodiment of the present invention may be executed by the second calculation module 24 .

The second acquisition module 25 is configured to acquire the number of overheated indoor units 17 .

Step S15 of the method for adjusting the opening of the electronic expansion valve 13 provided by the embodiment of the present invention may be executed by the second acquiring module 25 .

The third calculation module 26 is configured to calculate the correction coefficient according to the number of overheated indoor units 17 .

The step S16 of the method for adjusting the opening of the electronic expansion valve 13 provided by the embodiment of the present invention can be executed by the third calculation module 26 .

The fourth calculation module 27 is configured to calculate the target adjustment steps of the overheated indoor unit 17 according to the correction coefficient and the initial adjustment steps of the overheated indoor unit 17 .

Step S17 of the method for adjusting the opening of the electronic expansion valve 13 provided by the embodiment of the present invention can be executed by the fourth calculation module 27 .

The control module 28 is configured to adjust the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 according to the target adjustment steps corresponding to the overheated indoor unit 17 .

Step S18 , step S310 - step S370 , and step S410 - step S470 of the method for adjusting the opening of the electronic expansion valve 13 provided in the embodiment of the present invention may be executed by the second acquisition module 25 .

In the embodiment of the present invention, the controller may be an integrated circuit chip, which has a signal processing capability. The above-mentioned controller can be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), and can also be a single-chip microcomputer, a microcontroller unit (Microcontroller Unit, MCU), a complex programmable logic device (Complex Programmable Logic Device, CPLD), Field Programmable Gate Array (Field-Programmable GateArray, FPGA), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), embedded ARM and other chips, the controller can implement or execute the methods and steps disclosed in the embodiments of the present invention and logic block diagrams.

In a feasible implementation manner, the multi-connected air conditioner 10 may also include a memory for storing program instructions that can be executed by the controller. For example, the opening adjustment device 20 of the electronic expansion valve provided in the embodiment of the present application includes At least one may be stored in memory in the form of software or firmware. The memory can be an independent external memory, including but not limited to random access memory (Random Access Memory, RAM), read-only memory (Read Only Memory, ROM), programmable read-only memory (Programmable Read-Only Memory, PROM), Erasable Programmable Read-Only Memory (EPROM), Electric Erasable Programmable Read-Only Memory (EEPROM). The memory can also be integrated with the controller, for example, the memory and the controller can be integrated in the same chip.

Although the present invention is disclosed 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, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (14)

1. The utility model provides an aperture adjusting method of electronic expansion valve, is applied to multi-connected air conditioner (10), multi-connected air conditioner (10) include off-premises station and a plurality of indoor set (11), a plurality of indoor set (11) are parallelly connected, indoor set (11) include heat exchanger (12) and electronic expansion valve (13), indoor set (11) are through electronic expansion valve (13) with off-premises station is connected, characterized in that, the aperture adjusting method of electronic expansion valve includes:

acquiring an inlet pipe temperature value and an outlet pipe temperature value of the heat exchanger (12) of the indoor unit (11) under the condition of a refrigerating mode;

calculating the superheat degree of the indoor unit (11) according to the inlet pipe temperature value and the outlet pipe temperature value;

judging whether the superheat degree is in a section of a first preset value and a second preset value; wherein the first preset value is smaller than the second preset value;

if the superheat degree is not in the interval of the first preset value and the second preset value, calculating the initial adjustment step number of the electronic expansion valve (13) of the superheat indoor unit (17) according to the superheat degree; wherein the overheat indoor unit (17) represents an indoor unit (11) in which the degree of overheat is not within the interval of the first preset value and the second preset value;

Acquiring the number of the overheating indoor units (17);

calculating a correction factor according to the number of the overheated indoor units (17);

calculating a target regulation step number of the overheating indoor machine (17) according to the correction coefficient and the initial regulation step number of the overheating indoor machine (17);

according to the target adjusting step number corresponding to the overheating indoor unit (17), the opening degree of an electronic expansion valve (13) of the overheating indoor unit (17) is adjusted;

the step of calculating a correction factor in accordance with the number of the overheated indoor units (17) includes:

n＝k0*N

wherein n is more than or equal to 1, N is the number of the overheating indoor units 17, k0 is a proportionality coefficient, and the value is generally 0-1 and is a correction coefficient;

the step of calculating the target adjustment step number of the overheating indoor machine (17) according to the correction coefficient and the initial adjustment step number of the overheating indoor machine (17) comprises the following steps:

S(j) ₀ =S(j)/n

wherein S (j) is the initial adjustment step number, S (j) ₀ The number of steps is adjusted for the target.

2. The method of adjusting an opening degree of an electronic expansion valve according to claim 1, wherein the step of determining whether the degree of superheat is within a range of a first preset value and a second preset value comprises:

judging whether the superheat degree is smaller than the first preset value or not;

Judging whether the number of the overheating indoor units (17) is larger than or equal to a set number;

if the degree of superheat is smaller than the first preset value and the number of the overheating indoor units (17) is greater than or equal to the set number, the step of adjusting the opening of the electronic expansion valve (13) of the overheating indoor unit (17) according to the target adjustment step number corresponding to the overheating indoor unit (17) includes:

judging whether the target regulation step number is smaller than a first set parameter or not; and if the target adjustment step number of the part of the overheating indoor units (17) is smaller than the first setting parameter, controlling the opening degree of the electronic expansion valve (13) of the overheating indoor units (17) with the target adjustment step number smaller than the first setting parameter to be unchanged.

3. The opening degree adjustment method of an electronic expansion valve according to claim 2, characterized in that the step of adjusting the opening degree of the electronic expansion valve (13) of the superheating indoor unit (17) according to the target adjustment step number corresponding to the superheating indoor unit (17) further includes:

and if the target adjustment step numbers of all the overheating indoor units (17) with the overheating degree smaller than the first preset value are smaller than the first set parameter, reducing the opening of the corresponding electronic expansion valve (13) according to the overheating degree of the overheating indoor units (17).

4. A method of adjusting an opening degree of an electronic expansion valve according to claim 3, wherein the step of adjusting the opening degree of the corresponding electronic expansion valve (13) in accordance with the degree of superheat of the superheating indoor unit (17) includes:

controlling the electronic expansion valve (13) of the overheat indoor unit (17) with the minimum overheat degree to reduce the corresponding initial adjustment step number;

and controlling the opening degree of an electronic expansion valve (13) of the overheat indoor unit (17) of which the superheat degree is smaller than the first preset value and the target adjustment step number is smaller than the first set parameter to be unchanged.

5. The opening degree adjustment method of an electronic expansion valve according to claim 4, wherein the step of controlling the electronic expansion valve (13) of the superheating indoor unit (17) with the smallest superheat degree to adjust the corresponding initial adjustment step number includes:

if a plurality of overheating indoor units (17) with the superheat degree smaller than the first preset value and the superheat degree minimum exist at the same time, acquiring the indoor environment temperature value of the corresponding overheating indoor unit (17);

and controlling the overheat indoor unit (17) with the lowest environment temperature value to firstly adjust the opening of the electronic expansion valve (13).

6. The opening degree adjustment method of an electronic expansion valve according to claim 2, characterized in that the step of adjusting the opening degree of the electronic expansion valve (13) of the superheating indoor unit (17) according to the target adjustment step number corresponding to the superheating indoor unit (17) further includes:

and controlling an electronic expansion valve (13) of the overheating indoor machine (17) with the superheat degree smaller than the first preset value and the target regulation step number larger than or equal to the first set parameter to regulate the target regulation step number.

7. The method of adjusting an opening degree of an electronic expansion valve according to claim 1, wherein the step of determining whether the degree of superheat is within a range of a first preset value and a second preset value comprises:

judging whether the superheat degree is larger than the second preset value or not;

judging whether the number of the overheating indoor units (17) is larger than or equal to a set number;

if the degree of superheat is greater than the second preset value and the number of the overheated indoor units (17) is greater than or equal to the set number, the step of adjusting the opening of the electronic expansion valve (13) of the overheated indoor unit (17) according to the target adjustment step number corresponding to the overheated indoor unit (17) includes:

Judging whether the target regulation step number is smaller than a second set parameter;

and if the target adjustment step number of part of the overheating indoor units (17) is smaller than the second setting parameter, controlling the opening degree of an electronic expansion valve (13) of the overheating indoor units (17) with the target adjustment step number smaller than the second setting parameter to be unchanged.

8. The opening degree adjustment method of an electronic expansion valve according to claim 7, characterized in that the step of adjusting the opening degree of the electronic expansion valve (13) of the superheating indoor unit (17) according to the target adjustment step number corresponding to the superheating indoor unit (17) further includes:

and if the target adjustment step numbers of all the overheating indoor units (17) with the overheating degree larger than the second preset value are smaller than the second set parameter, adjusting the opening of the corresponding electronic expansion valve (13) according to the overheating degree of the overheating indoor units (17).

9. The opening degree adjustment method of an electronic expansion valve according to claim 8, wherein the step of adjusting the opening degree of the corresponding electronic expansion valve (13) in accordance with the degree of superheat of the superheat indoor unit (17) includes:

Controlling the electronic expansion valve (13) of the overheat indoor unit (17) with the largest overheat degree to increase the corresponding initial adjustment step number;

and controlling the opening degree of an electronic expansion valve (13) of the overheat indoor unit (17) of which the superheat degree is larger than the second preset value and the target adjustment step number is smaller than the second set parameter to be unchanged.

10. The opening degree adjustment method of an electronic expansion valve according to claim 9, wherein the step of controlling the electronic expansion valve (13) of the superheat indoor unit (17) having the largest degree of superheat to adjust the corresponding initial adjustment step number includes:

if a plurality of overheating indoor units (17) with the superheat degree being larger than the second preset value and the superheat degree being minimum exist at the same time, acquiring the indoor environment temperature value of the corresponding overheating indoor unit (17);

and controlling the overheat indoor unit (17) with the highest ambient temperature value to firstly adjust the opening of the electronic expansion valve (13).

11. The opening degree adjustment method of an electronic expansion valve according to claim 10, characterized in that the step of adjusting the opening degree of the electronic expansion valve (13) of the superheating indoor unit (17) according to the target adjustment step number corresponding to the superheating indoor unit (17) further includes:

And controlling an electronic expansion valve (13) of the overheating indoor machine (17) with the superheat degree being larger than the second preset value and the target adjustment step number being larger than or equal to the second set parameter to adjust the target adjustment step number.

12. The opening degree adjustment method of an electronic expansion valve according to claim 1, characterized in that the opening degree adjustment method of an electronic expansion valve includes:

if the superheat degree is smaller than the first preset value, controlling the opening degree of the corresponding electronic expansion valve (13) to be reduced;

if the superheat degree is larger than the second preset value, controlling the opening degree of the corresponding electronic expansion valve (13) to be increased;

and if the superheat degree is larger than or equal to a first preset value and smaller than or equal to a second preset value, controlling the opening degree of the corresponding electronic expansion valve (13) to be unchanged.

13. The utility model provides an aperture adjusting device of electronic expansion valve, is applied to multi-connected air conditioner (10), multi-connected air conditioner (10) include off-premises station and a plurality of indoor set (11), a plurality of indoor set (11) are parallelly connected, indoor set (11) include heat exchanger (12) and electronic expansion valve (13), indoor set (11) are through electronic expansion valve (13) with off-premises station is connected, characterized in that, aperture adjusting device (20) method of electronic expansion valve includes:

A first acquisition module (21) for acquiring an inlet pipe temperature value and an outlet pipe temperature value of the heat exchanger (12) of the indoor unit (11) under the condition of a refrigeration mode;

the first calculation module (22) is used for calculating the superheat degree of the indoor unit (11) according to the inlet pipe temperature and the outlet pipe temperature value;

the judging module (23) is used for judging whether the superheat degree is in a section of a first preset value and a second preset value; wherein the first preset value is smaller than the second preset value;

a second calculation module (24) configured to calculate, according to the degree of superheat, an initial number of steps of adjustment of the electronic expansion valve (13) of the superheat indoor unit (17) if the degree of superheat is not within a range of the first preset value and the second preset value; wherein the overheat indoor unit (17) represents an indoor unit (11) in which the degree of overheat is not within the interval of the first preset value and the second preset value;

a second acquisition module (25) for acquiring the number of overheated indoor units (17);

a third calculation module (26) for calculating a correction factor according to the number of the overheated indoor units (17);

a fourth calculation module (27) for calculating a target adjustment step number of the overheating indoor unit (17) according to the correction coefficient and the initial adjustment step number of the overheating indoor unit (17);

And the control module (28) is used for adjusting the opening of the electronic expansion valve (13) of the overheating indoor unit (17) according to the target adjustment step number corresponding to the overheating indoor unit (17).

14. A multi-connected air conditioner comprising a controller for executing computer instructions to implement the opening degree adjustment method of the electronic expansion valve according to any one of claims 1 to 12.