CN105485869B - Electric expansion valve fault detection method and device - Google Patents
Electric expansion valve fault detection method and device Download PDFInfo
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- CN105485869B CN105485869B CN201610008865.1A CN201610008865A CN105485869B CN 105485869 B CN105485869 B CN 105485869B CN 201610008865 A CN201610008865 A CN 201610008865A CN 105485869 B CN105485869 B CN 105485869B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of electric expansion valve fault detection method, this method includes：When air-conditioning opens refrigeration mode, the Current Temperatures of the Current Temperatures of interior machine and environment in the air-conditioning are obtained, as the first temperature of the interior machine and the first temperature of environment；If the difference of the first temperature of the interior machine and the first temperature of environment is less than the first predetermined threshold value, the opening value of electric expansion valve is adjusted to the first default opening value, and discharge the cold coal of liquid；After being separated by the first preset time, the opening value of electric expansion valve is adjusted to the second default opening value, wherein the second default opening value is equal to the sum of the described first default opening value and the maximum opening of the electric expansion valve.The invention also discloses a kind of electric expansion valve failure detectors.It is not tight that the present invention can prevent electric expansion valve from closing.
Description
Technical field
The present invention relates to air-conditioning technical field more particularly to a kind of electric expansion valve fault detection methods and device.
Background technology
Air-conditioning has become the essential household electrical appliances of people's household, people can be made to be in the ring of proper temperature by air-conditioning
When border, especially outdoor temperature are higher or relatively low.Present air-conditioning employs electric expansion valve to shut off to cold-coal pipe
Control.
In actual use, when air-conditioning is opened and freezed, electric expansion valve may be abnormal, and do not fastened and made
It is revealed into liquid refrigerants, at this time since wind turbine will not be opened, can cause liquid refrigerants that can not evaporate completely, liquid refrigerants directly returns
The hydraulic compression of compressor is caused into compressor, seriously affects the reliability of refrigeration system, such as due to various impurity lead to electricity
Sub- expansion valve pass is not tight, eventually leads to system failure.
Invention content
It is a primary object of the present invention to propose a kind of electric expansion valve fault detection method and device, it is intended to prevent electronics
Expansion valve closes not tight.
To achieve the above object, a kind of control method for electronic expansion valve provided by the invention, the method includes following steps
Suddenly：
When air-conditioning opens refrigeration mode, the Current Temperatures of the Current Temperatures of interior machine and environment in the air-conditioning are obtained, are made
For the first temperature of the interior machine and the first temperature of environment；
If the difference of the first temperature of the interior machine and the first temperature of environment is less than the first predetermined threshold value, electronics is adjusted
The opening value of expansion valve discharges the cold coal of liquid to the first default opening value；
After being separated by the first preset time, the opening value of electric expansion valve is adjusted to the second default opening value, wherein described
Two default opening values are equal to the sum of the described first default opening value and the maximum opening of the electric expansion valve.
Preferably, the method further includes：
Open wind turbine；
After being separated by the second preset time, the wind turbine is closed, and obtains the Current Temperatures of the interior machine and current environment temperature
Degree, as the second temperature of the interior machine and the second temperature of environment；
If the difference of the second temperature of the interior machine and the second temperature of environment be less than the second predetermined threshold value, judgement described in
Electric expansion valve breaks down.
Preferably, the method further includes：
When judging that the electric expansion valve breaks down, the air-conditioning is out of service.
Preferably, the opening value for adjusting electric expansion valve is to the first default opening value, and discharges the step of the cold coal of liquid
Include before rapid：
If the difference of the first temperature of the interior machine and the first temperature of environment be less than the first predetermined threshold value, open described in
Wind turbine；
After being separated by third preset time, the wind turbine is closed, and obtains the Current Temperatures and current environment of the interior machine
Temperature, as the third temperature of the interior machine and the third temperature of environment；
If the difference of the third temperature of the interior machine and the third temperature of environment is less than third predetermined threshold value, step is performed
Suddenly：The opening value of electric expansion valve is adjusted to the first default opening value, and discharges the cold coal of liquid.
Preferably, it is described when air-conditioning opens refrigeration mode, obtain the Current Temperatures of interior machine and environment in the air-conditioning
Current Temperatures, as the interior machine the first temperature and environment the first temperature the step of after include：
If the difference of the first temperature of the interior machine and the first temperature of environment is greater than or equal to the first predetermined threshold value, into
The normal control of the row electric expansion valve.
In addition, to achieve the above object, the present invention also provides a kind of control device for electronic expansion valve, described device includes：
First obtains module, for when air-conditioning opens refrigeration mode, obtain in the air-conditioning Current Temperatures of interior machine and
The Current Temperatures of environment, as the first temperature of the interior machine and the first temperature of environment；
First adjustment module, if the difference for the first temperature of the first temperature and environment of the interior machine is less than first in advance
If threshold value, then the opening value of electric expansion valve is adjusted to the first default opening value, and discharge the cold coal of liquid；
Second adjustment module after being separated by the first preset time, adjusts the opening value of electric expansion valve to second default
Opening value, wherein the second default opening value is equal to the maximum opening of the described first default opening value and the electric expansion valve
The sum of.
Preferably, described device further includes：
First opening module, for opening wind turbine；
Second obtains module, after being separated by the second preset time, closes the wind turbine, and obtain the current of the interior machine
Temperature and current environmental temperature, as the second temperature of the interior machine and the second temperature of environment；
Determination module, if the difference for the second temperature of the second temperature and environment of the interior machine is less than the second default threshold
Value, then judge that the electric expansion valve breaks down.
Preferably, described device further includes：
Stopping modular, for when judging that the electric expansion valve breaks down, the air-conditioning to be out of service.
Preferably, described device further includes：
Second opening module, if the difference for the first temperature of the first temperature and environment of the interior machine is less than first in advance
If threshold value, then the wind turbine is opened；
Third obtains module, after being separated by third preset time, closes the wind turbine, and obtain the current of the interior machine
The temperature of temperature and current environment, as the third temperature of the interior machine and the third temperature of environment；
If the difference of the third temperature of the interior machine and the third temperature of environment be less than third predetermined threshold value, described first
Adjustment module adjusts the opening value of electric expansion valve to the first default opening value, and discharges the cold coal of liquid.
Preferably, described device further includes：
Control module, if the difference for the first temperature of the first temperature and environment of the interior machine is greater than or equal to first
Predetermined threshold value then carries out the normal control of the electric expansion valve.
The present invention is by when air-conditioning opens refrigeration mode, obtaining working as the Current Temperatures of interior machine and environment in the air-conditioning
Preceding temperature, as the first temperature of the interior machine and the first temperature of environment；If the first temperature of the interior machine and environment
The difference of first temperature is less than the first predetermined threshold value, then adjusts the opening value of electric expansion valve to the first default opening value, and discharge
The cold coal of liquid；After being separated by the first preset time, the opening value of electric expansion valve is adjusted to the second default opening value, wherein described
Two default opening values are equal to the sum of the described first default opening value and the maximum opening of the electric expansion valve.Pass through above-mentioned side
Formula, the difference of the Current Temperatures for the Current Temperatures and environment that the present invention passes through air-conditioning internal machine judge whether electric expansion valve is abnormal,
If electric expansion valve is abnormal, such as due to impurity blocks electric expansion valve, then adjusting electric expansion valve, to be opened into first default
Aperture, and the cold coal of liquid is discharged, then adjust electronic expansion threshold values second and preset aperture, to fasten electric expansion valve, so as to prevent
The electric expansion valve of air-conditioning closes not tight.
Description of the drawings
Fig. 1 is the flow diagram of control method for electronic expansion valve first embodiment of the present invention；
Fig. 2 is the flow diagram of control method for electronic expansion valve second embodiment of the present invention；
Fig. 3 is the flow diagram of control method for electronic expansion valve 3rd embodiment of the present invention；
Fig. 4 is the high-level schematic functional block diagram of control device for electronic expansion valve first embodiment of the present invention；
Fig. 5 is the high-level schematic functional block diagram of control device for electronic expansion valve second embodiment of the present invention；
Fig. 6 is the high-level schematic functional block diagram of control device for electronic expansion valve 3rd embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of control method for electronic expansion valve.
With reference to Fig. 1, Fig. 1 is the flow diagram of control method for electronic expansion valve first embodiment of the present invention.
In the present embodiment, which includes：
Step S10 when air-conditioning opens refrigeration mode, obtains the current of the Current Temperatures of interior machine and environment in the air-conditioning
Temperature, as the first temperature of the interior machine and the first temperature of environment；
Specifically be present invention could apply to a set of air-conditioning system, multi-gang air-conditioner system can also be applied to
System, multi-online air-conditioning system refer to that one or more outer machine connects more interior machines and runs simultaneously.
When air-conditioning is opened in refrigeration mode, by sensor in the interior machine of the air-conditioning, such as temperature sensor, in real time
The Current Temperatures of the interior machine are monitored, and pass through the current temperature that environment temperature sensor monitors the interior machine ambient enviroment in real time
Degree, using obtain the Current Temperatures of the interior machine and the Current Temperatures of environment as the interior machine the first temperature and environment first
Temperature.The temperature obtained in the present embodiment is the temperature of certain of interior machine and environment, can be by air-conditioning in specific implementation
The Current Temperatures of multiple sensors acquisition many places of interior machine and interior machine local environment are arranged on, the acquisition interior machine is current to be averaged
Temperature and the current mean temperature of the interior machine local environment, of the first temperature and the environment respectively as the interior machine
One temperature.
Step S20, if the difference of the first temperature of the first temperature and environment of the interior machine is less than the first predetermined threshold value,
The opening value of electric expansion valve is adjusted to the first default opening value, and discharges the cold coal of liquid；
It compares in step S10 the first temperature of the interior machine obtained and the first temperature of environment, if the interior machine
The difference of first temperature and the first temperature of environment is less than the first predetermined threshold value, illustrates that electric expansion valve may not fastened, than
The electric expansion valve is such as seized by certain impurity.The predetermined threshold value is constant, and predetermined threshold value described in the present embodiment is
Positive integer, area that can be as residing for technical staff according to the air-conditioning are specifically set, naturally it is also possible to by technical staff
Rule of thumb unify to preset a desired value.
It, will when the difference of the first temperature of the first temperature and environment for determining the interior machine is less than the first predetermined threshold value
The current aperture regulation of electric expansion valve opens the electric expansion valve, liquid refrigerants then can at this time to the first default opening value
By the electric expansion valve, so as to wash away the impurity for blocking the electric expansion valve, first default opens described in the present embodiment
Angle value is less than or equal to the maximum opening of the electric expansion valve, naturally it is also possible to which the first default opening value is more than described
The maximum opening of electric expansion valve.
If the difference of the first temperature of the interior machine and the first temperature of environment is greater than or equal to the first predetermined threshold value,
Illustrate that the electric expansion valve has been fastened, carry out the normal control of the electric expansion valve.
Step S30 after being separated by the first preset time, adjusts the opening value of electric expansion valve to the second default opening value.
Be separated by first it is default between after, that is, after discharging liquid refrigerants for a period of time, open the electric expansion valve is current
Degree is adjusted to the second default aperture of the electric expansion valve, and the second default aperture is equal to the described first default aperture and institute
The sum of maximum opening of electric expansion valve is stated, there may be impurity due to having been washed away in step S20；Or due to electronic expansion
Valve is insensitive cause to close it is not tight, then when closing electric expansion valve, turned off on the basis of electric expansion valve does not shut down its most
Big aperture, so as to close the electric expansion valve, simultaneously because electric expansion valve self character will not damage electronic expansion
Valve.
The present invention is by when air-conditioning opens refrigeration mode, obtaining working as the Current Temperatures of interior machine and environment in the air-conditioning
Preceding temperature, as the first temperature of the interior machine and the first temperature of environment；If the first temperature of the interior machine and environment
The difference of first temperature is less than the first predetermined threshold value, then adjusts the opening value of electric expansion valve to the first default opening value, and discharge
The cold coal of liquid；After being separated by the first preset time, the opening value of electric expansion valve is adjusted to the second default opening value, wherein described
Two default opening values are equal to the sum of the described first default opening value and the maximum opening of the electric expansion valve.Pass through above-mentioned side
Formula, the difference of the Current Temperatures for the Current Temperatures and environment that the present invention passes through air-conditioning internal machine judge whether electric expansion valve is abnormal,
If electric expansion valve is abnormal, such as due to impurity blocks electric expansion valve, then adjusting electric expansion valve, to be opened into first default
Aperture, and the cold coal of liquid is discharged, then adjust electronic expansion threshold values second and preset aperture, to fasten electric expansion valve, so as to prevent
The electric expansion valve of air-conditioning closes not tight.
With reference to Fig. 2, Fig. 2 is the flow diagram of control method for electronic expansion valve second embodiment of the present invention.
Based on control method for electronic expansion valve first embodiment of the present invention, the method further includes：
Step S40 opens wind turbine；
Step S50 after being separated by the second preset time, closes the wind turbine, and obtains the Current Temperatures of the interior machine and work as
Preceding environment temperature, as the second temperature of the interior machine and the second temperature of environment；
To eliminate the influence of the liquid refrigerants left to temperature so that there is deviation in judging result, step S30 it
Afterwards, the second preset time of wind turbine is opened, by wind turbine evaporated liquid refrigerant, second preset time can be with described first in advance
It can also be different if the time is identical.If the Current Temperatures and current environmental temperature of the interior machine are regained, as described interior
The first temperature and ring of the interior machine are obtained in the second temperature of machine and the second temperature of environment, concrete mode and first embodiment
First temperature in border is identical, and details are not described herein again.
Step S60, if the difference of the second temperature of the second temperature and environment of the interior machine is less than the second predetermined threshold value,
Judge that the electric expansion valve breaks down.
It compares in the step S50 second temperatures of the interior machine obtained and the second temperature of environment, if the interior machine
The difference of second temperature and the second temperature of environment is less than the second predetermined threshold value, then judges that the electric expansion valve breaks down.
If the difference of the second temperature of the interior machine and the second temperature of environment be greater than or equal to the second predetermined threshold value, illustrate described in
Electric expansion valve has been fastened, and carries out the normal control of the electric expansion valve.The second predetermined threshold value can described in specific implementation
To be equal to first predetermined threshold value.
Further, when judging that the electric expansion valve breaks down, the air-conditioning is out of service.
If it is determined that the electric expansion valve breaks down, to ensure that compressor of air conditioner is not damaged, the air-conditioning is controlled
It is out of service.
With reference to Fig. 3, Fig. 3 is the flow diagram of control method for electronic expansion valve 3rd embodiment of the present invention
Based on control method for electronic expansion valve first embodiment of the present invention, include before step S20：
Step S70, if the difference of the first temperature of the first temperature and environment of the interior machine is less than the first predetermined threshold value,
Open the wind turbine；
It is less than in specific implementation in the difference of the first temperature of the first temperature and environment that determine the interior machine for the first time
During the first predetermined threshold value, the liquid refrigerants to prevent operation before this from leaving influences, and is determining the first of the interior machine
When the difference of temperature and the first temperature of environment is less than the first predetermined threshold value, the wind turbine is first opened for a period of time, evaporated liquid
Refrigerant.
Step S80 after being separated by third preset time, closes the wind turbine, and obtains the Current Temperatures of the interior machine and work as
The temperature of preceding environment, as the third temperature of the interior machine and the third temperature of environment；
After opening the wind turbine for a period of time, the wind turbine is closed, the third preset time that the wind turbine is opened can be with
First preset time, the second preset time is identical can also be different.
Then the Current Temperatures of the interior machine and the temperature of current environment are regained, the third temperature as the interior machine
With the third temperature of environment.
The third temperature of the interior machine and the third temperature of environment are compared, if the third temperature of the interior machine and environment
The difference of third temperature is less than third predetermined threshold value, illustrates that electric expansion valve is not fastened, it may be possible to since impurity causes, then perform
Step：The opening value of electric expansion valve is adjusted to the first default opening value, and discharges the cold coal of liquid.If the first of the interior machine
The difference of temperature and the third temperature of environment is greater than or equal to third predetermined threshold value, then the electric expansion valve has been fastened, into
The normal control of the row electric expansion valve.The third predetermined threshold value can be with second predetermined threshold value, the first default threshold
It is worth identical can also be different.
It should be noted that the core concept of the present invention is to judge electric expansion valve by interior machine and environment temperature
Whether fasten, if the electric expansion valve is fastened, normally controlled；If the electric expansion valve is not fastened,
Probably due to leaving liquid refrigerants or since the factors such as impurity cause electric expansion valve not fastened, so as to take corresponding place
Reason mode, i.e., the sequence of above-mentioned part operation can exchange in specific implementation, can also repeat repeatedly, improve and judge electricity
The accuracy of sub- expansion valve malfunction.
The present invention further provides a kind of control device for electronic expansion valve.
With reference to Fig. 4, Fig. 4 is the high-level schematic functional block diagram of control device for electronic expansion valve first embodiment of the present invention.
In the present embodiment, which includes：
First obtains module 10, for when air-conditioning opens refrigeration mode, obtaining the Current Temperatures of interior machine in the air-conditioning
With the Current Temperatures of environment, as the first temperature of the interior machine and the first temperature of environment.
Specifically be present invention could apply to a set of air-conditioning system, multi-gang air-conditioner system can also be applied to
System, multi-online air-conditioning system refer to that one or more outer machine connects more interior machines and runs simultaneously.
When air-conditioning is opened in refrigeration mode, by sensor in the interior machine of the air-conditioning, such as temperature sensor, in real time
The Current Temperatures of the interior machine are monitored, and pass through the current temperature that environment temperature sensor monitors the interior machine ambient enviroment in real time
Degree, using obtain the Current Temperatures of the interior machine and the Current Temperatures of environment as the interior machine the first temperature and environment first
Temperature.The temperature obtained in the present embodiment is the temperature of certain of interior machine and environment, can be by air-conditioning in specific implementation
The Current Temperatures of multiple sensors acquisition many places of interior machine and interior machine local environment are arranged on, the acquisition interior machine is current to be averaged
Temperature and the current mean temperature of the interior machine local environment, of the first temperature and the environment respectively as the interior machine
One temperature.
First adjustment module 20, if the difference for the first temperature of the first temperature and environment of the interior machine is less than first
Predetermined threshold value then adjusts the opening value of electric expansion valve to the first default opening value, and discharges the cold coal of liquid.
Comparison first obtains the first temperature of the interior machine and the first temperature of environment that module 10 obtains, if in described
The difference of first temperature of machine and the first temperature of environment is less than the first predetermined threshold value, illustrates that electric expansion valve may not closed
It is seized the electric expansion valve.The predetermined threshold value is constant, and threshold is preset described in the present embodiment
It is worth for positive integer, area that can be as residing for technical staff according to the air-conditioning is specifically set, naturally it is also possible to by technology
Personnel rule of thumb unify to preset a desired value.
It, will when the difference of the first temperature of the first temperature and environment for determining the interior machine is less than the first predetermined threshold value
The current aperture regulation of electric expansion valve opens the electric expansion valve, liquid refrigerants then can at this time to the first default opening value
By the electric expansion valve, so as to wash away the impurity for blocking the electric expansion valve, first default opens described in the present embodiment
Angle value is less than or equal to the maximum opening of the electric expansion valve, naturally it is also possible to which the first default opening value is more than described
The maximum opening of electric expansion valve.
Second adjustment module 30 after being separated by the first preset time, adjusts the opening value of electric expansion valve to second pre-
If opening value, wherein the maximum that the second default opening value is equal to the described first default opening value and the electric expansion valve is opened
The sum of degree.
Be separated by first it is default between after, that is, after discharging liquid refrigerants for a period of time, open the electric expansion valve is current
Degree is adjusted to the second default aperture of the electric expansion valve, and the second default aperture is equal to the described first default aperture and institute
The sum of maximum opening of electric expansion valve is stated, there may be impurity due to having been washed away by the first adjustment module 20；Or by
In electric expansion valve it is insensitive cause close it is not tight, then when closing electric expansion valve, on the basis of electric expansion valve does not shut down again
Its maximum opening closed, so as to close the electric expansion valve, simultaneously because electric expansion valve self character will not damage
Bad electric expansion valve.
Control module (not shown), if the difference for the first temperature of the first temperature and environment of the interior machine be more than or
Equal to the first predetermined threshold value, then the normal control of the electric expansion valve is carried out.
If the difference of the first temperature of the interior machine and the first temperature of environment is greater than or equal to the first predetermined threshold value,
Illustrate that the electric expansion valve has been fastened, carry out the normal control of the electric expansion valve.
The present invention is by when air-conditioning opens refrigeration mode, obtaining working as the Current Temperatures of interior machine and environment in the air-conditioning
Preceding temperature, as the first temperature of the interior machine and the first temperature of environment；If the first temperature of the interior machine and environment
The difference of first temperature is less than the first predetermined threshold value, then adjusts the opening value of electric expansion valve to the first default opening value, and discharge
The cold coal of liquid；After being separated by the first preset time, the opening value of electric expansion valve is adjusted to the second default opening value, wherein described
Two default opening values are equal to the sum of the described first default opening value and the maximum opening of the electric expansion valve.Pass through above-mentioned side
Formula, the difference of the Current Temperatures for the Current Temperatures and environment that the present invention passes through air-conditioning internal machine judge whether electric expansion valve is abnormal,
If electric expansion valve is abnormal, such as due to impurity blocks electric expansion valve, then adjusting electric expansion valve, to be opened into first default
Aperture, and the cold coal of liquid is discharged, then adjust electronic expansion threshold values second and preset aperture, to fasten electric expansion valve, so as to prevent
The electric expansion valve of air-conditioning closes not tight.
With reference to Fig. 5, Fig. 5 is the high-level schematic functional block diagram of control device for electronic expansion valve second embodiment of the present invention.
Based on control device for electronic expansion valve first embodiment of the present invention, described device further includes：
First opening module 40, for opening wind turbine.
Second obtains module 50, after being separated by the second preset time, closes the wind turbine, and obtains working as the interior machine
Preceding temperature and current environmental temperature, as the second temperature of the interior machine and the second temperature of environment.
To eliminate influence of the liquid refrigerants left to temperature, so that deviation occurs in judging result, adjusted second
After module 30 is adjusted, the second preset time of wind turbine is opened, by wind turbine evaporated liquid refrigerant, second preset time can be with
It is identical with first preset time to can also be different.If regain the Current Temperatures of the interior machine and current environment temperature
As the second temperature of the interior machine and the second temperature of environment, the interior machine is obtained in concrete mode and first embodiment for degree
The first temperature it is identical with the first temperature of environment, details are not described herein again.
Determination module 60, if the difference for the second temperature of the second temperature and environment of the interior machine is default less than second
Threshold value then judges that the electric expansion valve breaks down.
Comparison second obtains the second temperature of the interior machine and the second temperature of environment that module 50 obtains, if in described
The difference of the second temperature of machine and the second temperature of environment is less than the second predetermined threshold value, then judges that event occurs for the electric expansion valve
Barrier.If the difference of the second temperature of the interior machine and the second temperature of environment is greater than or equal to the second predetermined threshold value, illustrate
The electric expansion valve has been fastened, and the control module carries out the normal control of the electric expansion valve.Institute in specific implementation
First predetermined threshold value can be equal to by stating the second predetermined threshold value.
Stopping modular (not shown), for when judging that the electric expansion valve breaks down, the air-conditioning to be out of service.
If it is determined that the electric expansion valve breaks down, to ensure that compressor of air conditioner is not damaged, the air-conditioning is controlled
It is out of service.
With reference to Fig. 6, Fig. 6 is the high-level schematic functional block diagram of control device for electronic expansion valve 3rd embodiment of the present invention.
Based on control device for electronic expansion valve first embodiment of the present invention, described device further includes：
Second opening module 70, if the difference for the first temperature of the first temperature and environment of the interior machine is less than first
Predetermined threshold value then opens the wind turbine.
It is less than in specific implementation in the difference of the first temperature of the first temperature and environment that determine the interior machine for the first time
During the first predetermined threshold value, the liquid refrigerants to prevent operation before this from leaving influences, and is determining the first of the interior machine
When the difference of temperature and the first temperature of environment is less than the first predetermined threshold value, the wind turbine is first opened for a period of time, evaporated liquid
Refrigerant.
Third obtains module 80, after being separated by third preset time, closes the wind turbine, and obtains working as the interior machine
The temperature of preceding temperature and current environment, as the third temperature of the interior machine and the third temperature of environment；If the interior machine
The difference of third temperature and the third temperature of environment is less than third predetermined threshold value, then first adjustment module adjusts electric expansion valve
Opening value to the first default opening value, and discharge the cold coal of liquid.
After opening the wind turbine for a period of time, the wind turbine is closed, the third preset time that the wind turbine is opened can be with
First preset time, the second preset time is identical can also be different.
Then the Current Temperatures of the interior machine and the temperature of current environment are regained, the third temperature as the interior machine
With the third temperature of environment.
The third temperature of the interior machine and the third temperature of environment are compared, if the third temperature of the interior machine and environment
The difference of third temperature is less than third predetermined threshold value, illustrates that electric expansion valve is not fastened, it may be possible to since impurity causes, then perform
Step：The opening value of electric expansion valve is adjusted to the first default opening value, and discharges the cold coal of liquid.If the first of the interior machine
The difference of temperature and the third temperature of environment is greater than or equal to third predetermined threshold value, then the electric expansion valve has been fastened, institute
State the normal control that control module carries out the electric expansion valve.The third predetermined threshold value can be with the described second default threshold
Value, the first predetermined threshold value is identical can also be different.
It should be noted that the core concept of the present invention is to judge electric expansion valve by interior machine and environment temperature
Whether fasten, if the electric expansion valve is fastened, normally controlled；If the electric expansion valve is not fastened,
Probably due to leaving liquid refrigerants or since the factors such as impurity cause electric expansion valve not fastened, so as to take corresponding place
Reason mode, i.e., the sequence of above-mentioned part operation can exchange in specific implementation, can also repeat repeatedly, improve and judge electricity
The accuracy of sub- expansion valve malfunction.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow shift that bright specification and accompanying drawing content are made directly or indirectly is used in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of control method for electronic expansion valve, which is characterized in that the described method comprises the following steps：
When air-conditioning opens refrigeration mode, the Current Temperatures of the Current Temperatures of interior machine and environment in the air-conditioning are obtained, as institute
State the first temperature of interior machine and the first temperature of environment；
If the difference of the first temperature of the interior machine and the first temperature of environment is less than the first predetermined threshold value, electronic expansion is adjusted
The opening value of valve discharges the cold coal of liquid to the first default opening value；
After being separated by the first preset time, the electric expansion valve is reversely adjusted, the amplitude of accommodation is the second default opening value, wherein institute
The second default opening value is stated equal to the sum of the described first default opening value and the maximum opening of the electric expansion valve.
2. the method as described in claim 1, which is characterized in that the method further includes：
Open wind turbine；
After being separated by the second preset time, the wind turbine is closed, and obtains the Current Temperatures and current environmental temperature of the interior machine, is made
For the second temperature of the interior machine and the second temperature of environment；
If the difference of the second temperature of the interior machine and the second temperature of environment is less than the second predetermined threshold value, the electronics is judged
Expansion valve breaks down.
3. method as claimed in claim 2, which is characterized in that the method further includes：
When judging that the electric expansion valve breaks down, the air-conditioning is out of service.
4. method as claimed in claim 2, which is characterized in that the opening value for adjusting electric expansion valve is preset to first to be opened
Angle value, and the step of discharge liquid cold coal before include：
If the difference of the first temperature of the interior machine and the first temperature of environment is less than the first predetermined threshold value, the wind is opened
Machine；
After being separated by third preset time, the wind turbine is closed, and obtains the Current Temperatures of the interior machine and the temperature of current environment,
As the third temperature of the interior machine and the third temperature of environment；
If the difference of the third temperature of the interior machine and the third temperature of environment is less than third predetermined threshold value, step is performed：It adjusts
The opening value of electric expansion valve is saved to the first default opening value, and discharges the cold coal of liquid.
5. the method as described in claim 1, which is characterized in that it is described when air-conditioning opens refrigeration mode, obtain the air-conditioning
In the Current Temperatures of interior machine and the Current Temperatures of environment, as the interior machine the first temperature and environment the first temperature the step of
Include later：
If the difference of the first temperature of the interior machine and the first temperature of environment is greater than or equal to the first predetermined threshold value, institute is carried out
State the normal control of electric expansion valve.
6. a kind of control device for electronic expansion valve, which is characterized in that described device includes：
First obtains module, for when air-conditioning opens refrigeration mode, obtaining the Current Temperatures and environment of interior machine in the air-conditioning
Current Temperatures, as the first temperature of the interior machine and the first temperature of environment；
First adjustment module, if the difference for the first temperature of the first temperature and environment of the interior machine is less than the first default threshold
Value, then adjust the opening value of electric expansion valve to the first default opening value, and discharge the cold coal of liquid；
Second adjustment module after being separated by the first preset time, reversely adjusts the electric expansion valve, the amplitude of accommodation second
Default opening value, wherein the second default opening value is equal to the maximum of the described first default opening value and the electric expansion valve
The sum of aperture.
7. device as claimed in claim 6, which is characterized in that described device further includes：
First opening module, for opening wind turbine；
Second obtains module, after being separated by the second preset time, closes the wind turbine, and obtain the Current Temperatures of the interior machine
And current environmental temperature, as the second temperature of the interior machine and the second temperature of environment；
Determination module, if the difference for the second temperature of the second temperature and environment of the interior machine is less than the second predetermined threshold value,
Then judge that the electric expansion valve breaks down.
8. device as claimed in claim 7, which is characterized in that described device further includes：
Stopping modular, for when judging that the electric expansion valve breaks down, the air-conditioning to be out of service.
9. device as claimed in claim 7, which is characterized in that described device further includes：
Second opening module, if the difference for the first temperature of the first temperature and environment of the interior machine is less than the first default threshold
Value, then open the wind turbine；
Third obtains module, after being separated by third preset time, closes the wind turbine, and obtain the Current Temperatures of the interior machine
With the temperature of current environment, as the third temperature of the interior machine and the third temperature of environment；
If the difference of the third temperature of the interior machine and the third temperature of environment is less than third predetermined threshold value, described first is adjusted
Module adjusts the opening value of electric expansion valve to the first default opening value, and discharges the cold coal of liquid.
10. device as claimed in claim 6, which is characterized in that described device further includes：
Control module, if the difference for the first temperature of the first temperature and environment of the interior machine is default more than or equal to first
Threshold value then carries out the normal control of the electric expansion valve.
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| CN201610008865.1A CN105485869B (en) | 2016-01-04 | 2016-01-04 | Electric expansion valve fault detection method and device |
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| CN105953483B (en) * | 2016-04-25 | 2018-11-20 | 广东美的暖通设备有限公司 | The abatement detecting method of multi-line system and its indoor unit restricting element |
| CN105954052B (en) * | 2016-05-27 | 2018-04-20 | 珠海格力电器股份有限公司 | Capillary tube blockage detection system and method |
| CN106016621B (en) * | 2016-06-16 | 2018-10-26 | 珠海格力电器股份有限公司 | Leakage detection control method of multi-split air conditioning system |
| CN106500238B (en) * | 2016-09-12 | 2019-06-14 | 珠海格力电器股份有限公司 | Electronic expansion valve fault detection method and device and multi-online equipment system |
| CN106705512B (en) * | 2016-12-29 | 2019-04-23 | 青岛海尔空调器有限总公司 | A kind of control method of refrigeration system and the control method of air-conditioning |
| CN107152751B (en) * | 2017-04-21 | 2019-10-25 | 广东美的暖通设备有限公司 | Electric expansion valve fault detection method, air-conditioning and computer readable storage medium |
| CN107560101B (en) * | 2017-08-11 | 2019-10-25 | 宁波奥克斯电气股份有限公司 | A kind of fault detection method of air conditioner electronic expansion valve |
| CN109579350A (en) * | 2018-12-05 | 2019-04-05 | 南京天加环境科技有限公司 | A kind of multi-line system and its control method avoiding the occurrence of back liquid |
| CN109708248B (en) * | 2018-12-29 | 2020-02-04 | 广东美的暖通设备有限公司 | Valve failure detection method of air conditioning system and air conditioning system |
| CN112361541B (en) * | 2019-07-23 | 2022-06-24 | 青岛海尔空调电子有限公司 | Expansion valve control method for multi-split air conditioning system |
| CN111207482B (en) * | 2020-01-07 | 2020-12-29 | 珠海格力电器股份有限公司 | Air conditioner electronic expansion valve clamping adjustment control method and air conditioner |
| CN113154726B (en) * | 2020-01-21 | 2022-12-27 | 青岛海尔空调电子有限公司 | Detection method of electronic expansion valve of air conditioner indoor unit and renovation method of indoor unit |
| CN111486612A (en) * | 2020-04-29 | 2020-08-04 | 广东美的暖通设备有限公司 | Multi-split air conditioning system, heating valve leakage detection method and device thereof, and storage medium |
| CN111503948A (en) * | 2020-04-29 | 2020-08-07 | 广东美的暖通设备有限公司 | Multi-split air conditioning system, method and device for detecting leakage of refrigeration valve of multi-split air conditioning system and storage medium |
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