CN108224689B - Noise control method and controller of multi-connected air conditioning system - Google Patents

Noise control method and controller of multi-connected air conditioning system Download PDF

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Publication number
CN108224689B
CN108224689B CN201711250045.4A CN201711250045A CN108224689B CN 108224689 B CN108224689 B CN 108224689B CN 201711250045 A CN201711250045 A CN 201711250045A CN 108224689 B CN108224689 B CN 108224689B
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Prior art keywords
opening degree
expansion valve
indoor unit
coil temperature
air conditioning
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CN108224689A (en
Inventor
卢大海
王海胜
崔国栋
张铭
张中晓
刁洪福
高强
焦华
陈旭
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Qingdao Haier Air Conditioning Electric Co Ltd
Haier Zhijia Co Ltd
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Qingdao Haier Air Conditioning Electric Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24Means for preventing or suppressing noise
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24Means for preventing or suppressing noise
    • F24F2013/247Active noise-suppression

Abstract

The invention relates to the technical field of air conditioners, in particular to a noise control method and a controller of a multi-connected air conditioning system. The invention aims to solve the problem of low control precision in the prior technical scheme of replacing a large-caliber electronic expansion valve to solve the standby noise of a heating indoor unit. The noise control method comprises the following steps: when the operation mode of the multi-connected air conditioning system is a heating mode, acquiring the operation time of the heating mode; when the running time is greater than the time threshold, controlling the opening degrees of the expansion valves corresponding to all the indoor units in the standby state to be adjusted to the reference opening degree; the opening degree of the expansion valve corresponding to each indoor unit in the standby state is adjusted based on the target parameter. By the control method, the expansion valve of each indoor unit can be respectively adjusted, and the noise control precision is improved.

Description

Noise control method and controller of multi-connected air conditioning system
Technical Field
The invention relates to the technical field of air conditioners, in particular to a noise control method and a controller of a multi-connected air conditioning system.
Background
In recent years, the multi-connected air conditioning system has become a preferred solution for air conditioning in collective places such as office buildings, shopping malls, apartments and the like due to the advantages of convenient installation, small influence on the appearance of buildings, remarkable cooling/heating effect and the like. When the multi-split air conditioning system operates in a heating mode, in order to avoid the accumulation of refrigerant, the electronic expansion valve of the heating indoor unit which is not normally started is kept at a certain opening degree (namely, the opening degree is kept) so that the refrigerant participates in the circulation of the system. However, when the refrigerant flows, since the fan of the heating indoor unit does not operate, the flowing sound of the refrigerant is amplified, and then noise is generated, especially in a room needing silence such as a bedroom, so that rest of a user is affected, and very poor use experience is brought.
In order to solve the noise problem when the heating indoor unit is in standby state, the scheme that an electronic expansion valve with a larger caliber replaces an expansion valve with a smaller caliber in the original air-conditioning indoor unit is mostly adopted in the prior art to solve the problem. The proposal reduces the flow velocity of the refrigerant by increasing the aperture of the expansion valve and changing the flow channel of the expansion valve, thereby reducing the noise generated by the flow of the refrigerant. Although the noise problem caused by the flowing of the refrigerant is solved to a certain extent in the mode, certain defects are also avoided. Firstly, by increasing the aperture of the electronic expansion valve and changing the flow passage, in practical application, the expansion valve still keeps a fixed opening, so that some indoor units still have certain noise. Secondly, the cost of the whole air conditioning system is increased to a certain extent by adopting the large-diameter electronic expansion valve, and for a multi-connected air conditioning system, the cost of the multi-connected air conditioning system can be greatly increased by replacing the electronic expansion valves of a plurality of indoor units at the same time. That is to say, the existing technical scheme of solving the problem of noise generated when the heating indoor unit is in standby by replacing the large-diameter electronic expansion valve has the problems of low control precision and high cost.
Accordingly, there is a need in the art for a new noise control method for a multi-connected air conditioning system to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problems of low control precision and high cost in the existing technical scheme of solving the standby noise of the heating indoor unit by replacing the large-diameter electronic expansion valve, the invention provides a noise control method of a multi-connected air conditioning system, wherein the multi-connected air conditioning system comprises an outdoor unit and a plurality of indoor units, each indoor unit is provided with an expansion valve, and the noise control method is characterized by comprising the following steps:
when the operation mode of the multi-connected air conditioning system is a heating mode, acquiring the operation time of the heating mode;
when the running time is greater than a time threshold value, controlling the opening degrees of the expansion valves corresponding to all the indoor units in the standby state to be adjusted to a reference opening degree;
the opening degree of the expansion valve corresponding to each indoor unit in the standby state is adjusted based on the target parameter.
In the preferable technical scheme of the noise control method of the multi-connected air conditioning system, the target parameter is the target coil temperature of the coil of the indoor unit.
In a preferred embodiment of the noise control method for a multi-type air conditioning system, the step of "adjusting the opening degree of the expansion valve corresponding to each indoor unit in the standby state based on the target parameter" further includes:
acquiring the outdoor environment temperature and the actual coil temperature of each indoor unit coil;
determining the target coil temperature of the indoor unit coil based on the corresponding relation between the outdoor environment temperature and the target coil temperature;
and adjusting the opening degree of the expansion valve corresponding to each indoor unit in the standby state based on the target coil temperature and each actual coil temperature.
In a preferred embodiment of the noise control method for a multi-split air conditioning system, the step of "adjusting the opening degree of the expansion valve corresponding to each indoor unit in a standby state based on the target coil temperature and each actual coil temperature" further includes:
when the actual coil temperature is lower than the target coil temperature, controlling the opening degree of an expansion valve of the indoor unit corresponding to the actual coil temperature to increase by a first set opening degree; or
And when the actual coil temperature is higher than the target coil temperature, controlling the opening degree of an expansion valve of the indoor unit corresponding to the actual coil temperature to reduce a first set opening degree.
In a preferred embodiment of the noise control method for a multi-type air conditioning system, the step of "adjusting the opening degree of the expansion valve corresponding to each indoor unit in a standby state based on the target parameter" is performed every first set time.
In a preferred embodiment of the noise control method for a multi-split air conditioning system, after the step of controlling the opening degree of the expansion valve of the indoor unit corresponding to the actual coil temperature to increase by a first set opening degree when the actual coil temperature is lower than the target coil temperature, the noise control method further includes:
stopping decreasing the opening degree of the expansion valve when the opening degree of the expansion valve decreases to a minimum set threshold value.
In a preferred embodiment of the noise control method of the multi-split air conditioning system, after the step of controlling the opening degree of the expansion valve of the indoor unit corresponding to the actual coil temperature to decrease by a first set opening degree when the actual coil temperature is higher than the target coil temperature, the noise control method further includes:
when the opening degree of the expansion valve increases to a maximum set threshold value, the increase of the opening degree of the expansion valve is stopped.
The invention also provides a controller of the multi-connected air conditioning system, and the controller can execute the noise control method in any scheme.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, a noise control method of a multi-connected air conditioning system includes: when the operation mode of the multi-connected air conditioning system is a heating mode, acquiring the operation time of the heating mode; when the running time is greater than the time threshold, controlling the opening degrees of the expansion valves corresponding to all the indoor units in the standby state to be adjusted to the reference opening degree; the opening degree of the expansion valve corresponding to each indoor unit in the standby state is adjusted based on the target parameter. By controlling the opening degree of the expansion valve corresponding to the indoor unit in the standby state to be adjusted to the reference opening degree first and then adjusting the opening degree of the expansion valve corresponding to each indoor unit in the standby state based on the target parameter in the heating mode, the noise control method can control the noise of each standby indoor unit, and improves the control accuracy and the noise control effect.
Specifically, by acquiring the outdoor environment temperature and the actual coil temperature of each indoor unit coil, determining the target coil temperature of each indoor unit coil based on the outdoor environment temperature, and then adjusting the opening of the expansion valve corresponding to each indoor unit based on the comparison between the actual coil temperature and the target coil temperature, the invention can control the opening of the expansion valve of the indoor unit corresponding to the actual coil temperature to increase the first set opening when the actual coil temperature is less than the target coil temperature; or when the actual coil temperature is higher than the target coil temperature, controlling the opening degree of an expansion valve of the indoor unit corresponding to the actual coil temperature to reduce the first set opening degree. The principle of the control mode for reducing noise is as follows: when the actual coil temperature is lower than the target coil temperature, the amount of the refrigerant accumulated in the coil of the indoor unit is proved to be excessive, and at the moment, the opening of the expansion valve is increased, so that the flow of the refrigerant is adapted to the opening of the expansion valve, and the noise generated by the flow of the refrigerant in the indoor unit is reduced or eliminated; when the actual coil temperature is lower than the target coil temperature, the refrigerant quantity in the coil of the indoor unit is proved to be less, and the original opening is kept to easily generate noise, so that the flow of the refrigerant is adapted to the opening of the expansion valve in a mode of reducing the opening of the expansion valve, and the noise generated by the refrigerant flowing in the indoor unit is reduced or eliminated. That is to say, through the control method, the problems of low control precision and high cost in the technical scheme of solving the standby noise of the heating indoor unit by replacing the large-caliber electronic expansion valve in the prior art are solved, and the user experience is improved. In addition, the method of the invention does not need to change the original structure of the air conditioning system in the control process, so the invention also saves the cost of the whole machine.
Drawings
The noise control method and the controller of the multi-connected air conditioning system according to the present invention will be described with reference to the accompanying drawings. In the drawings:
FIG. 1 is a schematic flow chart of a noise control method of a multi-connected air conditioning system according to the present invention;
fig. 2 is a flowchart illustrating a method for adjusting an opening degree of an expansion valve corresponding to each indoor unit in a standby state based on a target parameter according to the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, for those skilled in the art, the multi-connected air conditioning system includes an outdoor unit and a plurality of indoor units connected in series or in parallel with the outdoor unit, components such as an outdoor unit heat exchanger, a compressor, an outdoor unit electronic expansion valve, and a control chip are disposed in the outdoor unit, components such as an indoor unit heat exchanger, an indoor unit electronic expansion valve, and the like are disposed in the indoor unit, and a connection relationship between the above components, a cooling and heating principle of the air conditioning system, and the like are known, and will not be described in detail herein.
The invention provides a noise control method of a multi-connected air conditioning system, aiming at solving the problems of low control precision and high overall cost of the technical scheme of solving the standby noise of heating indoor units by replacing a large-diameter electronic expansion valve in the prior art.
Referring to fig. 1, fig. 1 is a flow chart illustrating a noise control method of a multi-split air conditioning system according to the present invention. As shown in fig. 1, the noise control method of the multi-connected air conditioning system of the present invention mainly includes the following steps:
s100, when the operation mode of the multi-connected air conditioning system is a heating mode, acquiring the operation time of the heating mode; if the operation mode of the multi-connected air conditioning system comprises a refrigeration mode, a heating mode, an air supply mode and a dehumidification mode, the multi-connected air conditioning system acquires the current operation mode through a control chip of the outdoor unit, and the control chip acquires the operation time of the heating mode of the air conditioner through a timer in the air conditioner.
S200, when the operation time is greater than a time threshold, controlling the opening degrees of the expansion valves corresponding to all the indoor units in the standby state to be adjusted to a reference opening degree; for example, the time threshold is 10min, the reference opening degree is a reserved opening degree of an expansion valve in the prior art (for example, the reserved opening degree is 24P, where P is an opening degree pulse unit, the same applies below), when the operation time of the heating mode is greater than 10min, the air-conditioning heating operation has reached a stable state, and then the opening degree of the expansion valve corresponding to the indoor unit in the standby state is controlled to be adjusted to the reserved opening degree of the expansion valve; of course, the time threshold and the reference opening are not always set, and those skilled in the art can adjust them. If the time threshold value can be 3min, 5min, 15min or the like, the heating operation can be stable as long as the multi-connected air conditioning system runs for the time; the reference opening degree may be an arbitrary value near the retention opening degree.
S300, adjusting the opening degree of an expansion valve corresponding to each indoor unit in the standby state based on the target parameters; for example, the coil temperature of each indoor unit coil is obtained, and the opening degree of the expansion valve corresponding to the indoor unit is determined and adjusted according to the coil temperature of each indoor unit, so as to accurately control the noise of each indoor unit.
As can be seen from the above description, in the heating mode, by controlling the expansion valve corresponding to the indoor unit in the standby state to adjust to the reference opening degree, and then adjusting the expansion valve corresponding to each indoor unit based on the target parameter, the noise control method of the present invention can individually control the noise in the room where each indoor unit is located, thereby improving the control accuracy and the noise control effect of the noise, keeping the room where each indoor unit in the standby state is located quiet, and improving the user experience.
Referring to fig. 2, fig. 2 is a flow chart illustrating a method for adjusting an opening degree of an expansion valve corresponding to each indoor unit in a standby state based on a target parameter according to the present invention.
As shown in fig. 2, in a possible implementation, step S300 further includes:
s310, acquiring the outdoor environment temperature and the actual coil temperature of each indoor unit coil; for example, the outdoor environment temperature and the actual coil temperature are obtained by respectively arranging temperature sensors on the coils of the outdoor unit and the indoor unit.
S320, determining the target coil temperature of the indoor unit coil based on the corresponding relation between the outdoor environment temperature and the target coil temperature; in a possible embodiment, the target coil temperature may be obtained based on experimental data, and represents the temperature of the coil of the indoor unit corresponding to the temperature when the opening degree of the expansion valve is adjusted to the optimal opening degree so that the indoor unit in the standby state does not generate noise within a certain outdoor environment temperature range. For example, the inventors of the present invention have developed a table of outdoor ambient temperature versus target coil temperature based on a number of experiments, i.e., table 1:
TABLE 1
Outdoor ambient temperature (. degree. C.) Target coil temperature (. degree. C.)
(-∞,-10] 36
(-10,10] 38
(10,+∞) 40
And S330, adjusting the opening degree of the expansion valve corresponding to each indoor unit in the standby state based on the target coil temperature and each actual coil temperature.
In a possible implementation, the adjusting means may further include:
i) and when the actual coil temperature is lower than the target coil temperature, controlling the opening degree of an expansion valve of the indoor unit corresponding to the actual coil temperature to increase by a first set opening degree. Preferably, the first set opening degree may be 2P. For example, the opening degree of the expansion valve corresponding to the indoor unit is at the reserved opening degree of 24P, at this time, if the outdoor environment temperature is 0 ℃ (the corresponding target coil temperature is 38 ℃), and the actual coil temperature is 30 ℃, it is proved that the refrigerant in the coil is excessively accumulated, at this time, the opening degree of the expansion valve is controlled to increase 2P on the basis of 24P to reach 26P, the flow rate of the refrigerant can be adapted to the opening degree of the expansion valve, and the noise generated by the indoor unit can be reduced on the basis of ensuring the backflow of the refrigerant.
And ii) when the actual coil temperature is higher than the target coil temperature, controlling the opening degree of an expansion valve of the indoor unit corresponding to the actual coil temperature to be reduced by a first set opening degree. For example, if the opening degree of the expansion valve corresponding to the indoor unit is at the reserved opening degree of 24P, and the outdoor environment temperature is 0 ℃ (the corresponding target coil temperature is 38 ℃), and the actual coil temperature is 42 ℃, the refrigerant in the coil is less, and noise is easily generated by keeping the original opening degree, at this time, the opening degree of the expansion valve is controlled to be reduced by 2P on the basis of 24P to reach 22P, so that the flow rate of the refrigerant can be adapted to the opening degree of the expansion valve, and the noise generated when the refrigerant flows through the expansion valve can be reduced.
Further preferably, the step of "adjusting the opening degree of the expansion valve corresponding to each indoor unit in the standby state based on the target parameter" is performed once every first set time. Such as every 1 minute. Of course, the control may be performed every 2min, 3min, or 5min, and the shorter the isolated time setting is, the higher the control accuracy of the control method can be.
Further preferably, a minimum set opening degree and a maximum set opening degree may be set for an adjustment range of the expansion valve to further improve the control accuracy. If the minimum set opening degree can be 16P, the problem of refrigerant accumulation possibly caused when the opening degree of the expansion valve is smaller than 16P is avoided; the maximum set opening degree may be 75P to avoid a problem that noise may be generated again in the indoor unit when the opening degree of the expansion valve is greater than 75P. Of course, the above-mentioned minimum set opening and maximum set opening are only a specific setting manner, and those skilled in the art can adjust the values without departing from the principle of the present invention, so as to adapt the present invention to more specific application scenarios.
In addition, in order to increase the safety of the multi-split air conditioning system and prevent the air conditioning system from refrigerant loss when the control method is used, in a possible embodiment, the noise control method of the invention may further include the following steps:
when any indoor unit is switched from the running state to the standby state, the control chip of the outdoor unit controls the expansion valve of the indoor unit to be opened at the first target opening degree within the second set time, and switches the state of the indoor unit to the standby state after the second set time is continued. For example, when an indoor unit is switched from a heating operation to a standby state, the control chip of the outdoor unit forces the expansion valve corresponding to the indoor unit to maintain an opening degree of 350P for 1min, so that the refrigerant in the indoor unit is fully returned within 1min, and the problem of refrigerant accumulation caused by immediately closing the expansion valve when the indoor unit enters the standby state is avoided. After 1min, the control chip controls the state of the outdoor unit to be switched to a standby state, so that the outdoor unit participates in the judgment of the noise control method.
And when the discharge temperature of the compressor of the outdoor unit is not less than the threshold temperature or the opening degree of the expansion valve corresponding to the outdoor unit is not less than the threshold opening degree for a third set time, controlling the expansion valves corresponding to all the standby indoor units to be opened at a second target opening degree within a fourth set time. For example, when the discharge temperature of the compressor of the outdoor unit reaches or exceeds 100 ℃, or the opening degree of the expansion valve corresponding to the outdoor unit reaches or exceeds 400P and lasts for 1min, it is proved that the refrigerant quantity of the outdoor unit is lost, and at this time, the expansion valves corresponding to all standby indoor units are simultaneously opened to 88P, so that the refrigerants accumulated in the pipelines of the indoor units can timely flow back, thereby avoiding the occurrence of the refrigerant loss and improving the safety of the air conditioning system.
Of course, the specific parameters in the two control methods are only presented as examples, and those skilled in the art can flexibly adjust the parameters according to actual application scenarios to improve the safety performance of the air conditioning system.
The invention also provides a controller of the multi-connected air conditioning system, and the controller can execute the noise control method. Such a controller may be physically one (such as the aforementioned control chip) provided in the outdoor unit, may be one for each indoor unit, may be a controller dedicated to performing the method of the present invention, or may be one functional module or functional unit of a general controller.
In summary, by using the noise control method, the opening degree of the expansion valve corresponding to each indoor unit in the standby state can be adjusted according to the target parameter of each indoor unit in the standby state when the heating indoor units are in standby, so that the opening degrees of the expansion valves corresponding to all the indoor units are adapted to the flow rate of the refrigerant, and the noise generated by the refrigerant flowing in the indoor units is greatly reduced or even eliminated. In addition, the original structure of the air conditioning system is not required to be changed in the adjusting process, and the cost of the whole machine is saved. That is to say, through the control method, the problems of low control precision and high cost in the technical scheme of solving the standby noise of the heating indoor unit by replacing the large-caliber electronic expansion valve in the prior art are solved, and the user experience is improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (6)

1. A noise control method of a multi-connected air conditioning system, the multi-connected air conditioning system comprises an outdoor unit and a plurality of indoor units, each indoor unit is provided with an expansion valve, and the noise control method is characterized by comprising the following steps:
when the operation mode of the multi-connected air conditioning system is a heating mode, acquiring the operation time of the heating mode;
when the running time is greater than a time threshold value, controlling the opening degrees of the expansion valves corresponding to all the indoor units in the standby state to be adjusted to a reference opening degree;
adjusting the opening degree of an expansion valve corresponding to each indoor unit in the standby state based on the target parameters;
the target parameter is the target coil temperature of the coil of the indoor unit;
the step of "adjusting the opening degree of the expansion valve corresponding to each indoor unit in the standby state based on the target parameter" further includes:
acquiring the outdoor environment temperature and the actual coil temperature of each indoor unit coil;
determining the target coil temperature of the indoor unit coil based on the corresponding relation between the outdoor environment temperature and the target coil temperature;
and adjusting the opening degree of the expansion valve corresponding to each indoor unit in the standby state based on the target coil temperature and each actual coil temperature.
2. The method as claimed in claim 1, wherein the step of adjusting the opening degree of the expansion valve corresponding to each indoor unit in the standby state based on the target coil temperature and each actual coil temperature further comprises:
when the actual coil temperature is lower than the target coil temperature, controlling the opening degree of an expansion valve of the indoor unit corresponding to the actual coil temperature to increase by a first set opening degree; or
And when the actual coil temperature is higher than the target coil temperature, controlling the opening degree of an expansion valve of the indoor unit corresponding to the actual coil temperature to reduce a first set opening degree.
3. The noise control method of a multi-type air conditioning system according to claim 2, wherein the step of adjusting the opening degree of the expansion valve corresponding to each indoor unit in the standby state based on the target parameter is performed once every first set time.
4. The noise control method of claim 2, wherein after the step of controlling the opening degree of the expansion valve of the indoor unit corresponding to the actual coil temperature to increase by a first set opening degree when the actual coil temperature is lower than the target coil temperature, the noise control method further comprises:
stopping decreasing the opening degree of the expansion valve when the opening degree of the expansion valve decreases to a minimum set threshold value.
5. The noise control method of claim 2, wherein after the step of controlling the opening degree of the expansion valve of the indoor unit corresponding to the actual coil temperature to decrease by a first set opening degree when the actual coil temperature is greater than the target coil temperature, the noise control method further comprises:
when the opening degree of the expansion valve increases to a maximum set threshold value, the increase of the opening degree of the expansion valve is stopped.
6. A controller of a multi-connected air conditioning system, characterized in that the controller is capable of performing the noise control method of any one of claims 1 to 5.
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