CN107084494A - Fault detection method, detection means and the multi-connected air conditioning system of electric expansion valve - Google Patents
Fault detection method, detection means and the multi-connected air conditioning system of electric expansion valve Download PDFInfo
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- CN107084494A CN107084494A CN201710313548.5A CN201710313548A CN107084494A CN 107084494 A CN107084494 A CN 107084494A CN 201710313548 A CN201710313548 A CN 201710313548A CN 107084494 A CN107084494 A CN 107084494A
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- expansion valve
- electric expansion
- temperature
- air conditioner
- room air
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
-
- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention proposes a kind of fault detection method of electric expansion valve, detection means and multi-connected air conditioning system, wherein, the fault detection method of electric expansion valve includes：Opening is in electric expansion valve, whether detection room air conditioner receives self-checking command；When detecting room air conditioner and receiving self-checking command, control room air conditioner enters Auto-Sensing Mode, in Auto-Sensing Mode, and electric expansion valve is closed or aperture reduces；When detecting room air conditioner and running preset duration under Auto-Sensing Mode, gather the first temperature value, with the relation according to the first temperature value and preset temperature threshold value, judge electric expansion valve whether failure, wherein, the first temperature value for heat exchanger outlet temperature.Pass through technical scheme, on the one hand, reduce the probability that electric expansion valve is run under failure, on the other hand, user or maintenance personal is made to find failure in time, to be repaired, the service life of multi-connected air conditioning system is extended, the usage experience of user is improved.
Description
Technical field
The present invention relates to air-conditioner field, in particular to a kind of fault detection method of electric expansion valve, Yi Zhong electricity
The failure detector of sub- expansion valve and a kind of multi-connected air conditioning system.
Background technology
In correlation technique, in multi-connected air conditioning system, most of room air conditioner is used as regulation using electric expansion valve
Device, to realize the flow restriction control of flow, there is following defect according to refrigeration or heating effect：
(1) growth or other external causes with use time may result in electronic expansion valve of indoor unit and event occur
Barrier, it is impossible to which normal increase aperture reduces aperture, so as to influence the normal operation of system, the normal of influence user is used；
(2) user is as layman, when phenomenon of the failure performance is not obvious, it is difficult to find that event occurs in electric expansion valve
Barrier, so that air-conditioning system long-play under abnormal conditions, causes damage to air-conditioning system miscellaneous part, increase is follow-up
Maintenance cost and difficulty；
(3) maintenance personal when to air-conditioning malfunction elimination, it is necessary to detect electric expansion valve whether normally run when, it is necessary to examine
The operational factor of room air conditioner is surveyed, checking process is cumbersome.
The content of the invention
At least one in order to solve the above-mentioned technical problem, it is an object of the present invention to provide a kind of electric expansion valve
Fault detection method.
It is another object of the present invention to provide a kind of failure detector of electric expansion valve.
It is another object of the present invention to provide a kind of multi-connected air conditioning system.
To achieve these goals, the embodiment of first aspect present invention proposes a kind of fault detect of electric expansion valve
Method, including：Opening is in electric expansion valve, whether detection room air conditioner receives self-checking command；Detecting
When room air conditioner receives self-checking command, control room air conditioner enters Auto-Sensing Mode, in Auto-Sensing Mode, electric expansion valve
Close or aperture reduces；When detecting room air conditioner and running preset duration under Auto-Sensing Mode, the first temperature value is gathered, with
According to the relation of the first temperature value and preset temperature threshold value, judge electric expansion valve whether failure, wherein, the first temperature value is to change
The outlet temperature of hot device.
In the technical scheme, heat exchanger is provided with room air conditioner, heat exchanger passes through electronic expansion valve regulation refrigerant
Flow, when electric expansion valve is in opening, i.e. room air conditioner and is in refrigeration or heats state, sends out to room air conditioner
Self-checking command is sent, with when air conditioner receives self-checking command indoors, into Auto-Sensing Mode, in Auto-Sensing Mode, can be passed through
Reduce the aperture of electric expansion valve or close electric expansion valve, realize that electric expansion valve is closed or aperture reduces, especially in heat exchange
The exit of device, runs after preset duration in Auto-Sensing Mode, controls the outlet temperature (the first temperature value) of heat collecting exchanger, with
According to the relation between the first temperature value and preset temperature threshold value, judge electric expansion valve whether failure, realize electronic expansion
The automatic decision of valve failure, on the one hand, reduce the probability that electric expansion valve is run under failure, on the other hand, make user or
Maintenance personal has found failure in time, to be repaired, and extends the service life of multi-connected air conditioning system, improves making for user
With experience.
In multi-connected air conditioning system, outdoor air-conditioner can use air-cooled heat exchange mode, and room air conditioner is using direct
Heat exchanger exchanges heat, to realize refrigeration or heat, wherein, heat exchanger is evaporator or condenser, passes through the temperature to specified location
Whether detection, be operating normally to the electric expansion valve of room air conditioner and judge, and reaches that the electronics of detection room air conditioner is swollen
The purpose of swollen valve failure, and when breaking down, convenient investigation abort situation.
Specifically, preset temperature threshold value can be preset temperature range, and preset temperature is in detecting the first temperature value
During scope, determine that the electric expansion valve of room air conditioner is normally run.
In addition, the first temperature value can also be by the inlet temperature of heat collecting exchanger or the internal temperature of heat exchanger with presetting
Temperature threshold compares, come determine electric expansion valve whether failure.
In addition, the fault detection method of the electric expansion valve in above-described embodiment for providing of the present invention can also have it is as follows
Additional technical feature：
In the above-mentioned technical solutions, it is preferable that when detecting room air conditioner and running preset duration under Auto-Sensing Mode,
Gather the first temperature value, with the relation according to the first temperature value and preset temperature threshold value, judge electric expansion valve whether failure, have
Body comprises the following steps：When heat exchanger is evaporator, when gathering the first temperature value, synchronous acquisition second temperature value；Detection
Whether second temperature value and the difference of the first temperature value are more than or equal to temperature difference threshold；Difference is being detected more than or equal to the temperature difference
During threshold value, electric expansion valve failure is determined, wherein, second temperature value is the environment temperature residing for room air conditioner, second temperature
The difference of value and preset temperature threshold value is temperature difference threshold.
In the technical scheme, by the way that while the first temperature value is gathered, collection second temperature value be (room air conditioner
Environment temperature, i.e. indoor temperature), to detect whether the first temperature value and the difference of second temperature value are more than or equal to temperature difference threshold
Value, when detecting difference more than or equal to temperature difference threshold, shows that evaporator does not heat up normally, i.e., the aperture of electric expansion valve is not
Reduce or the non-normal switching-off of electric expansion valve, that is, show that electric expansion valve breaks down, wherein, temperature difference threshold can be the second temperature
The difference as preset temperature threshold value is spent, by detecting whether the first temperature value and the difference of second temperature value meet default bar
Part, compared with the detection mode of preset temperature range, the accuracy of fault detect is higher.
In any of the above-described technical scheme, it is preferable that when detecting room air conditioner and receiving self-checking command, control room
Interior air conditioner enters Auto-Sensing Mode, in Auto-Sensing Mode, and electric expansion valve is closed or aperture reduces, and specifically includes following steps：
When air conditioner receives self-checking command indoors, control room air conditioner switches to air supply pattern, and under air supply pattern, electronics is swollen
Swollen valve is closed；When detecting room air conditioner and running the first preset duration under air supply pattern, control room air conditioner switching
To shutdown mode, and run under shutdown mode the second preset duration, so that residual refrigerant evaporation, wherein, the first preset duration
It is equal to preset duration with the second preset duration sum.
In the technical scheme, combined, only opened first with shutdown mode by the way that Auto-Sensing Mode is set into air supply pattern
Air supply pattern, and control to close electric expansion valve, so that refrigerant stops flowing, imitated with the circulation for improving heat exchanger surrounding air
Rate, and then refrigerant evaporation efficiency is lifted, run under air supply pattern after the first preset duration, control room air conditioner is shut down, and is entered
One step makes residual refrigerant evaporation, when electric expansion valve is normally run, and the outlet temperature of heat exchanger should be close to environment temperature (i.e.
First temperature value is close to second temperature value), the temperature adjustment of evaporator is realized, so that the detection of the temperature difference is facilitated, to enter one
The accuracy of step lifting fault detect, lifts the usage experience of user.
Specifically, when heat exchanger is evaporator, import liquid low temperature refrigerant from outdoor air-conditioner and pass through electric expansion valve
Aperture is controlled, in the evaporator that liquid low temperature refrigerant is imported to room air conditioner, liquid low temperature refrigerant easily evaporates under low pressure,
Evaporation is changed into steam process, absorbs the heat of cooling medium, to realize refrigeration, and air conditioner is in stopped status indoors
When, electric expansion valve should be at shutting state in normal state, and now evaporator does not have refrigerant to flow through, the evaporator collected
Outlet temperature T1 (the first temperature value) the environment temperature T2 that temperature sensor is measured being disposed in the interior on machine should be similar to
(second temperature value), if electric expansion valve is in malfunction, it is impossible to normally shut, may result at evaporator has refrigerant stream
Cross, and now indoor set blower fan does not start, refrigerant does not evaporate, and the outlet temperature of the evaporator collected can be substantially relatively low.
By determining T1 and T2 difference, to judge whether electronic expansion valve of indoor unit can be operating normally, and then to electronics
Expansion valve malfunction makes timely feedback, to ensure that system is normally run.
In addition, Auto-Sensing Mode can also be reduction electronic expansion valve opening+air supply pattern, or reduce electronic expansion valve opening
+ air supply pattern+shutdown mode etc..
In any of the above-described technical scheme, it is preferable that also include：It is determined that during electric expansion valve failure, generation failure is carried
Show information.
In the technical scheme, by it is determined that during electric expansion valve failure, fault in production prompt message, to point out user
Electric expansion valve produces failure, allows users to carry out investigation maintenance to failure in time, reduces due to electric expansion valve failure
The probability of lifetime of system is influenceed, the usage experience of user is improved.
Wherein, electric expansion valve failure includes step-out, stuck, impurity blocking or asynchronous machine open circuit etc..
In any of the above-described technical scheme, it is preferable that also include：When detecting difference less than fiducial temperature threshold value, root
According to control signal, electric expansion valve is opened.
In the technical scheme, by when detecting difference less than fiducial temperature threshold value, reopening electric expansion valve,
According to control signal, to realize to indoor refrigeration or heat, make room air conditioner when detecting electric expansion valve fault-free,
It can continue to operation.
Wherein, control signal can be default control signal, can also when real-time control signal.
The embodiment of second aspect of the present invention proposes a kind of failure detector of electric expansion valve, including：Detection is single
Member, for being in opening in electric expansion valve, whether detection room air conditioner receives self-checking command；Control unit, is used
When detecting room air conditioner and receiving self-checking command, control room air conditioner enters Auto-Sensing Mode；Collecting unit, is used for
When detecting room air conditioner and running preset duration under Auto-Sensing Mode, the first temperature value is gathered, with according to the first temperature value
With the relation of preset temperature threshold value, judge electric expansion valve whether failure, wherein, the first temperature value be heat exchanger outlet temperature
Degree.
In the technical scheme, heat exchanger is provided with room air conditioner, heat exchanger passes through electronic expansion valve regulation refrigerant
Flow, when electric expansion valve is in opening, i.e. room air conditioner and is in refrigeration or heats state, sends out to room air conditioner
Self-checking command is sent, with when air conditioner receives self-checking command indoors, into Auto-Sensing Mode, in Auto-Sensing Mode, can be passed through
Reduce the aperture of electric expansion valve or close electric expansion valve, realize that electric expansion valve is closed or aperture reduces, especially in heat exchange
The exit of device, runs after preset duration in Auto-Sensing Mode, controls the outlet temperature (the first temperature value) of heat collecting exchanger, with
According to the relation between the first temperature value and preset temperature threshold value, judge electric expansion valve whether failure, realize electronic expansion
The automatic decision of valve failure, on the one hand, reduce the probability that electric expansion valve is run under failure, on the other hand, make user or
Maintenance personal has found failure in time, to be repaired, and extends the service life of multi-connected air conditioning system, improves making for user
With experience.
In multi-connected air conditioning system, outdoor air-conditioner can use air-cooled heat exchange mode, and room air conditioner is using direct
Heat exchanger exchanges heat, to realize refrigeration or heat, wherein, heat exchanger is evaporator or condenser, passes through the temperature to specified location
Whether detection, be operating normally to the electric expansion valve of room air conditioner and judge, and reaches that the electronics of detection room air conditioner is swollen
The purpose of swollen valve failure, and when breaking down, convenient investigation abort situation.
Specifically, preset temperature threshold value can be preset temperature range, and preset temperature is in detecting the first temperature value
During scope, determine that the electric expansion valve of room air conditioner is normally run.
In addition, the first temperature value can also be by the inlet temperature of heat collecting exchanger or the internal temperature of heat exchanger with presetting
Temperature threshold compares, come determine electric expansion valve whether failure.
In any of the above-described technical scheme, it is preferable that also include：Collecting unit is additionally operable to：When heat exchanger is evaporator,
When gathering the first temperature value, synchronous acquisition second temperature value；Detection unit is additionally operable to：Detect second temperature value and the first temperature
Whether the difference of value is more than or equal to temperature difference threshold；The failure detector of electric expansion valve also includes：Determining unit, for
When detecting difference more than or equal to temperature difference threshold, electric expansion valve failure is determined, wherein, second temperature value is room air conditioner
The difference of residing environment temperature, second temperature value and preset temperature threshold value is temperature difference threshold.
In the technical scheme, by the way that while the first temperature value is gathered, collection second temperature value be (room air conditioner
Environment temperature, i.e. indoor temperature), to detect whether the first temperature value and the difference of second temperature value are more than or equal to temperature difference threshold
Value, when detecting difference more than or equal to temperature difference threshold, shows that evaporator does not heat up normally, i.e., the aperture of electric expansion valve is not
Reduce or the non-normal switching-off of electric expansion valve, that is, show that electric expansion valve breaks down, wherein, temperature difference threshold can be the second temperature
The difference as preset temperature threshold value is spent, by detecting whether the first temperature value and the difference of second temperature value meet default bar
Part, compared with the detection mode of preset temperature range, the accuracy of fault detect is higher.
In any of the above-described technical scheme, it is preferable that control unit is additionally operable to：Air conditioner receives self-checking command indoors
When, control room air conditioner switches to air supply pattern, under air supply pattern, and electric expansion valve is closed；Control unit is additionally operable to：
When detecting room air conditioner and running the first preset duration under air supply pattern, control room air conditioner switches to shutdown mode,
And run the second preset duration under shutdown mode so that residual refrigerant evaporation, wherein, the first preset duration and second it is default when
Long sum is equal to preset duration.
In the technical scheme, combined, only opened first with shutdown mode by the way that Auto-Sensing Mode is set into air supply pattern
Air supply pattern, and control to close electric expansion valve, so that refrigerant stops flowing, imitated with the circulation for improving heat exchanger surrounding air
Rate, and then refrigerant evaporation efficiency is lifted, run under air supply pattern after the first preset duration, control room air conditioner is shut down, and is entered
One step makes residual refrigerant evaporation, when electric expansion valve is normally run, and the outlet temperature of heat exchanger should be close to environment temperature (i.e.
First temperature value is close to second temperature value), the temperature adjustment of evaporator is realized, so that the detection of the temperature difference is facilitated, to enter one
The accuracy of step lifting fault detect, lifts the usage experience of user.
Specifically, when heat exchanger is evaporator, import liquid low temperature refrigerant from outdoor air-conditioner and pass through electric expansion valve
Aperture is controlled, in the evaporator that liquid low temperature refrigerant is imported to room air conditioner, liquid low temperature refrigerant easily evaporates under low pressure,
Evaporation is changed into steam process, absorbs the heat of cooling medium, to realize refrigeration, and air conditioner is in stopped status indoors
When, electric expansion valve should be at shutting state in normal state, and now evaporator does not have refrigerant to flow through, the evaporator collected
Outlet temperature T1 (the first temperature value) the environment temperature T2 that temperature sensor is measured being disposed in the interior on machine should be similar to
(second temperature value), if electric expansion valve is in malfunction, it is impossible to normally shut, may result at evaporator has refrigerant stream
Cross, and now indoor set blower fan does not start, refrigerant does not evaporate, and the outlet temperature of the evaporator collected can be substantially relatively low.
By determining T1 and T2 difference, to judge whether electronic expansion valve of indoor unit can be operating normally, and then to electronics
Expansion valve malfunction makes timely feedback, to ensure that system is normally run.
In addition, Auto-Sensing Mode can also be reduction electronic expansion valve opening+air supply pattern, or reduce electronic expansion valve opening
+ air supply pattern+shutdown mode etc..
In any of the above-described technical scheme, it is preferable that also include：Tip element, for it is determined that electric expansion valve failure
When, generate fault cues information.
In the technical scheme, by it is determined that during electric expansion valve failure, fault in production prompt message, to point out user
Electric expansion valve produces failure, allows users to carry out investigation maintenance to failure in time, reduces due to electric expansion valve failure
The probability of lifetime of system is influenceed, the usage experience of user is improved.
Wherein, electric expansion valve failure includes step-out, stuck, impurity blocking or asynchronous machine open circuit etc..
In any of the above-described technical scheme, it is preferable that control unit is additionally operable to：Difference is being detected less than fiducial temperature threshold
During value, according to control signal, electric expansion valve is opened.
In the technical scheme, by when detecting difference less than fiducial temperature threshold value, reopening electric expansion valve,
According to control signal, to realize to indoor refrigeration or heat, make room air conditioner when detecting electric expansion valve fault-free,
It can continue to operation.
Wherein, control signal can be default control signal, can also when real-time control signal.
The embodiment of third aspect present invention proposes a kind of multi-connected air conditioning system, including at least one outdoor air conditioner
Device；Multiple room air conditioners, are connected at least one outdoor air-conditioner, wherein, any one room conditioning includes this hair
The failure detector for the electric expansion valve that the embodiment of bright second aspect is proposed, therefore, the multi-connected air conditioning system include upper
The technique effect of the failure detector of the electric expansion valve of any one technical scheme is stated, be will not be repeated here.
The additional aspect and advantage of the present invention will become obvious in following description section, or pass through the practice of the present invention
Recognize.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from description of the accompanying drawings below to embodiment is combined
Substantially and be readily appreciated that, wherein：
Fig. 1 shows the schematic flow diagram of the fault detection method of the electric expansion valve of one embodiment of the present of invention；
Fig. 2 shows the schematic block diagram of the failure detector of the electric expansion valve of embodiments of the invention；
Fig. 3 shows the schematic block diagram of the multi-connected air conditioning system of embodiments of the invention；
Fig. 4 shows the schematic flow diagram of the fault detection method of the electric expansion valve of an alternative embodiment of the invention；
Fig. 5 shows the structural representation of the multi-connected air conditioning system of embodiments of the invention.
Embodiment
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that the above objects, features and advantages of the present invention
Mode is applied the present invention is further described in detail.It should be noted that in the case where not conflicting, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
Implemented with being different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Fig. 1 shows the schematic flow diagram of the fault detection method of the electric expansion valve of one embodiment of the present of invention
As shown in figure 1, the fault detection method of the electric expansion valve of one embodiment of the present of invention, including：Step 102,
Opening is in electric expansion valve, whether detection room air conditioner receives self-checking command；Step 104, room is being detected
When interior air conditioner receives self-checking command, control room air conditioner enters Auto-Sensing Mode, in Auto-Sensing Mode, and electric expansion valve is closed
Close or aperture reduces；Step 106, when detecting room air conditioner and running preset duration under Auto-Sensing Mode, the temperature of collection first
Angle value, with the relation according to the first temperature value and preset temperature threshold value, judge electric expansion valve whether failure, wherein, first is warm
Angle value is the outlet temperature of heat exchanger.
In the technical scheme, heat exchanger is provided with room air conditioner, heat exchanger passes through electronic expansion valve regulation refrigerant
Flow, when electric expansion valve is in opening, i.e. room air conditioner and is in refrigeration or heats state, sends out to room air conditioner
Self-checking command is sent, with when air conditioner receives self-checking command indoors, into Auto-Sensing Mode, in Auto-Sensing Mode, can be passed through
Reduce the aperture of electric expansion valve or close electric expansion valve, realize that electric expansion valve is closed or aperture reduces, especially in heat exchange
The exit of device, runs after preset duration in Auto-Sensing Mode, controls the outlet temperature (the first temperature value) of heat collecting exchanger, with
According to the relation between the first temperature value and preset temperature threshold value, judge electric expansion valve whether failure, realize electronic expansion
The automatic decision of valve failure, on the one hand, reduce the probability that electric expansion valve is run under failure, on the other hand, make user or
Maintenance personal has found failure in time, to be repaired, and extends the service life of multi-connected air conditioning system, improves making for user
With experience.
In multi-connected air conditioning system, outdoor air-conditioner can use air-cooled heat exchange mode, and room air conditioner is using direct
Heat exchanger exchanges heat, to realize refrigeration or heat, wherein, heat exchanger is evaporator or condenser, passes through the temperature to specified location
Whether detection, be operating normally to the electric expansion valve of room air conditioner and judge, and reaches that the electronics of detection room air conditioner is swollen
The purpose of swollen valve failure, and when breaking down, convenient investigation abort situation.
Specifically, preset temperature threshold value can be preset temperature range, and preset temperature is in detecting the first temperature value
During scope, determine that the electric expansion valve of room air conditioner is normally run.
In addition, the first temperature value can also be by the inlet temperature of heat collecting exchanger or the internal temperature of heat exchanger with presetting
Temperature threshold compares, come determine electric expansion valve whether failure.
In addition, the fault detection method of the electric expansion valve in above-described embodiment for providing of the present invention can also have it is as follows
Additional technical feature：
In the above-mentioned technical solutions, it is preferable that when detecting room air conditioner and running preset duration under Auto-Sensing Mode,
Gather the first temperature value, with the relation according to the first temperature value and preset temperature threshold value, judge electric expansion valve whether failure, have
Body comprises the following steps：When heat exchanger is evaporator, when gathering the first temperature value, synchronous acquisition second temperature value；Detection
Whether second temperature value and the difference of the first temperature value are more than or equal to temperature difference threshold；Difference is being detected more than or equal to the temperature difference
During threshold value, electric expansion valve failure is determined, wherein, second temperature value is the environment temperature residing for room air conditioner, second temperature
The difference of value and preset temperature threshold value is temperature difference threshold.
In the technical scheme, by the way that while the first temperature value is gathered, collection second temperature value be (room air conditioner
Environment temperature, i.e. indoor temperature), to detect whether the first temperature value and the difference of second temperature value are more than or equal to temperature difference threshold
Value, when detecting difference more than or equal to temperature difference threshold, shows that evaporator does not heat up normally, i.e., the aperture of electric expansion valve is not
Reduce or the non-normal switching-off of electric expansion valve, that is, show that electric expansion valve breaks down, wherein, temperature difference threshold can be the second temperature
The difference as preset temperature threshold value is spent, by detecting whether the first temperature value and the difference of second temperature value meet default bar
Part, compared with the detection mode of preset temperature range, the accuracy of fault detect is higher.
In any of the above-described technical scheme, it is preferable that when detecting room air conditioner and receiving self-checking command, control room
Interior air conditioner enters Auto-Sensing Mode, in Auto-Sensing Mode, and electric expansion valve is closed or aperture reduces, and specifically includes following steps：
When air conditioner receives self-checking command indoors, control room air conditioner switches to air supply pattern, and under air supply pattern, electronics is swollen
Swollen valve is closed；When detecting room air conditioner and running the first preset duration under air supply pattern, control room air conditioner switching
To shutdown mode, and run under shutdown mode the second preset duration, so that residual refrigerant evaporation, wherein, the first preset duration
It is equal to preset duration with the second preset duration sum.
In the technical scheme, combined, only opened first with shutdown mode by the way that Auto-Sensing Mode is set into air supply pattern
Air supply pattern, and control to close electric expansion valve, so that refrigerant stops flowing, imitated with the circulation for improving heat exchanger surrounding air
Rate, and then refrigerant evaporation efficiency is lifted, run under air supply pattern after the first preset duration, control room air conditioner is shut down, and is entered
One step makes residual refrigerant evaporation, when electric expansion valve is normally run, and the outlet temperature of heat exchanger should be close to environment temperature (i.e.
First temperature value is close to second temperature value), the temperature adjustment of evaporator is realized, so that the detection of the temperature difference is facilitated, to enter one
The accuracy of step lifting fault detect, lifts the usage experience of user.
Specifically, when heat exchanger is evaporator, import liquid low temperature refrigerant from outdoor air-conditioner and pass through electric expansion valve
Aperture is controlled, in the evaporator that liquid low temperature refrigerant is imported to room air conditioner, liquid low temperature refrigerant easily evaporates under low pressure,
Evaporation is changed into steam process, absorbs the heat of cooling medium, to realize refrigeration, and air conditioner is in stopped status indoors
When, electric expansion valve should be at shutting state in normal state, and now evaporator does not have refrigerant to flow through, the evaporator collected
Outlet temperature T1 (the first temperature value) the environment temperature T2 that temperature sensor is measured being disposed in the interior on machine should be similar to
(second temperature value), if electric expansion valve is in malfunction, it is impossible to normally shut, may result at evaporator has refrigerant stream
Cross, and now indoor set blower fan does not start, refrigerant does not evaporate, and the outlet temperature of the evaporator collected can be substantially relatively low.
By determining T1 and T2 difference, to judge whether electronic expansion valve of indoor unit can be operating normally, and then to electronics
Expansion valve malfunction makes timely feedback, to ensure that system is normally run.
In addition, Auto-Sensing Mode can also be reduction electronic expansion valve opening+air supply pattern, or reduce electronic expansion valve opening
+ air supply pattern+shutdown mode etc..
In any of the above-described technical scheme, it is preferable that also include：It is determined that during electric expansion valve failure, generation failure is carried
Show information.
In the technical scheme, by it is determined that during electric expansion valve failure, fault in production prompt message, to point out user
Electric expansion valve produces failure, allows users to carry out investigation maintenance to failure in time, reduces due to electric expansion valve failure
The probability of lifetime of system is influenceed, the usage experience of user is improved.
Wherein, electric expansion valve failure includes step-out, stuck, impurity blocking or asynchronous machine open circuit etc..
In any of the above-described technical scheme, it is preferable that also include：When detecting difference less than fiducial temperature threshold value, root
According to control signal, electric expansion valve is opened.
In the technical scheme, by when detecting difference less than fiducial temperature threshold value, reopening electric expansion valve,
According to control signal, to realize to indoor refrigeration or heat, make room air conditioner when detecting electric expansion valve fault-free,
It can continue to operation.
Wherein, control signal can be default control signal, can also when real-time control signal.
Fig. 2 shows the schematic block diagram of the failure detector of the electric expansion valve of embodiments of the invention.
As shown in Fig. 2 the failure detector 200 of the electric expansion valve of embodiments of the invention, including：Detection unit
202, for being in opening in electric expansion valve, whether detection room air conditioner receives self-checking command；Control unit
204, for when detecting room air conditioner and receiving self-checking command, control room air conditioner to enter Auto-Sensing Mode；Collection is single
Member 206, for when detecting room air conditioner and run preset duration under Auto-Sensing Mode, the first temperature value of collection, with basis
The relation of first temperature value and preset temperature threshold value, judge electric expansion valve whether failure, wherein, the first temperature value is heat exchanger
Outlet temperature.
In the technical scheme, heat exchanger is provided with room air conditioner, heat exchanger passes through electronic expansion valve regulation refrigerant
Flow, when electric expansion valve is in opening, i.e. room air conditioner and is in refrigeration or heats state, sends out to room air conditioner
Self-checking command is sent, with when air conditioner receives self-checking command indoors, into Auto-Sensing Mode, in Auto-Sensing Mode, can be passed through
Reduce the aperture of electric expansion valve or close electric expansion valve, realize that electric expansion valve is closed or aperture reduces, especially in heat exchange
The exit of device, runs after preset duration in Auto-Sensing Mode, controls the outlet temperature (the first temperature value) of heat collecting exchanger, with
According to the relation between the first temperature value and preset temperature threshold value, judge electric expansion valve whether failure, realize electronic expansion
The automatic decision of valve failure, on the one hand, reduce the probability that electric expansion valve is run under failure, on the other hand, make user or
Maintenance personal has found failure in time, to be repaired, and extends the service life of multi-connected air conditioning system, improves making for user
With experience.
In multi-connected air conditioning system, outdoor air-conditioner can use air-cooled heat exchange mode, and room air conditioner is using direct
Heat exchanger exchanges heat, to realize refrigeration or heat, wherein, heat exchanger is evaporator or condenser, passes through the temperature to specified location
Whether detection, be operating normally to the electric expansion valve of room air conditioner and judge, and reaches that the electronics of detection room air conditioner is swollen
The purpose of swollen valve failure, and when breaking down, convenient investigation abort situation.
Specifically, preset temperature threshold value can be preset temperature range, and preset temperature is in detecting the first temperature value
During scope, determine that the electric expansion valve of room air conditioner is normally run.
In addition, the first temperature value can also be by the inlet temperature of heat collecting exchanger or the internal temperature of heat exchanger with presetting
Temperature threshold compares, come determine electric expansion valve whether failure.
In any of the above-described technical scheme, it is preferable that also include：Collecting unit 206 is additionally operable to：It is evaporator in heat exchanger
When, when gathering the first temperature value, synchronous acquisition second temperature value；Detection unit 202 is additionally operable to：Detect second temperature value and the
Whether the difference of one temperature value is more than or equal to temperature difference threshold；The failure detector 200 of electric expansion valve also includes：It is determined that single
Member 208, for when detecting difference more than or equal to temperature difference threshold, determining electric expansion valve failure, wherein, second temperature value
For the environment temperature residing for room air conditioner, the difference of second temperature value and preset temperature threshold value is temperature difference threshold.
In the technical scheme, by the way that while the first temperature value is gathered, collection second temperature value be (room air conditioner
Environment temperature, i.e. indoor temperature), to detect whether the first temperature value and the difference of second temperature value are more than or equal to temperature difference threshold
Value, when detecting difference more than or equal to temperature difference threshold, shows that evaporator does not heat up normally, i.e., the aperture of electric expansion valve is not
Reduce or the non-normal switching-off of electric expansion valve, that is, show that electric expansion valve breaks down, wherein, temperature difference threshold can be the second temperature
The difference as preset temperature threshold value is spent, by detecting whether the first temperature value and the difference of second temperature value meet default bar
Part, compared with the detection mode of preset temperature range, the accuracy of fault detect is higher.
In any of the above-described technical scheme, it is preferable that control unit 204 is additionally operable to：Air conditioner receives self-inspection indoors
During instruction, control room air conditioner switches to air supply pattern, under air supply pattern, and electric expansion valve is closed；Control unit 204 is also
For：When detecting room air conditioner and running the first preset duration under air supply pattern, control room air conditioner, which is switched to, to stop
Machine pattern, and run under shutdown mode the second preset duration, so that residual refrigerant evaporation, wherein, the first preset duration and the
Two preset duration sums are equal to preset duration.
In the technical scheme, combined, only opened first with shutdown mode by the way that Auto-Sensing Mode is set into air supply pattern
Air supply pattern, and control to close electric expansion valve, so that refrigerant stops flowing, imitated with the circulation for improving heat exchanger surrounding air
Rate, and then refrigerant evaporation efficiency is lifted, run under air supply pattern after the first preset duration, control room air conditioner is shut down, and is entered
One step makes residual refrigerant evaporation, when electric expansion valve is normally run, and the outlet temperature of heat exchanger should be close to environment temperature (i.e.
First temperature value is close to second temperature value), the temperature adjustment of evaporator is realized, so that the detection of the temperature difference is facilitated, to enter one
The accuracy of step lifting fault detect, lifts the usage experience of user.
Specifically, when heat exchanger is evaporator, import liquid low temperature refrigerant from outdoor air-conditioner and pass through electric expansion valve
Aperture is controlled, in the evaporator that liquid low temperature refrigerant is imported to room air conditioner, liquid low temperature refrigerant easily evaporates under low pressure,
Evaporation is changed into steam process, absorbs the heat of cooling medium, to realize refrigeration, and air conditioner is in stopped status indoors
When, electric expansion valve should be at shutting state in normal state, and now evaporator does not have refrigerant to flow through, the evaporator collected
Outlet temperature T1 (the first temperature value) the environment temperature T2 that temperature sensor is measured being disposed in the interior on machine should be similar to
(second temperature value), if electric expansion valve is in malfunction, it is impossible to normally shut, may result at evaporator has refrigerant stream
Cross, and now indoor set blower fan does not start, refrigerant does not evaporate, and the outlet temperature of the evaporator collected can be substantially relatively low.
By determining T1 and T2 difference, to judge whether electronic expansion valve of indoor unit can be operating normally, and then to electronics
Expansion valve malfunction makes timely feedback, to ensure that system is normally run.
In addition, Auto-Sensing Mode can also be reduction electronic expansion valve opening+air supply pattern, or reduce electronic expansion valve opening
+ air supply pattern+shutdown mode etc..
In any of the above-described technical scheme, it is preferable that also include：Tip element 210, for it is determined that electric expansion valve event
During barrier, fault cues information is generated.
In the technical scheme, by it is determined that during electric expansion valve failure, fault in production prompt message, to point out user
Electric expansion valve produces failure, allows users to carry out investigation maintenance to failure in time, reduces due to electric expansion valve failure
The probability of lifetime of system is influenceed, the usage experience of user is improved.
Wherein, electric expansion valve failure includes step-out, stuck, impurity blocking or asynchronous machine open circuit etc..
In any of the above-described technical scheme, it is preferable that control unit 204 is additionally operable to：It is less than default temperature detecting difference
During poor threshold value, according to control signal, electric expansion valve is opened.
In the technical scheme, by when detecting difference less than fiducial temperature threshold value, reopening electric expansion valve,
According to control signal, to realize to indoor refrigeration or heat, make room air conditioner when detecting electric expansion valve fault-free,
It can continue to operation.
Wherein, control signal can be default control signal, can also when real-time control signal.
As shown in figure 3, the embodiment of third aspect present invention proposes a kind of multi-connected air conditioning system 300, including at least
One outdoor air-conditioner；Multiple room air conditioners, are connected at least one outdoor air-conditioner, wherein, any one room conditioning
The failure detector 200 of the electric expansion valve proposed including the embodiment including second aspect of the present invention, therefore, the multiple
Air-conditioning system 300 includes the technique effect of the failure detector 200 of the electric expansion valve of any of the above-described technical scheme, herein
Repeat no more.
With reference to Fig. 4 and Fig. 5, the failure detection schemes to the electric expansion valve of the present invention are further described.
As shown in figure 4, multi-connected air conditioning system according to an embodiment of the invention, including：Compressor 402, condenser
404, it is disposed in the outdoor, electric expansion valve 406, evaporator 412, temperature sensor 410, pipe temperature sensor 408, pipe temperature sensor
414 and pipe temperature sensor 416.
Specifically, temperature sensor 410 is positioned over the correct position of indoor set, for detecting indoor environment temperature, Guan Wen
Sensor 408 is positioned over the entrance of indoor machine evaporation 412, and for detecting inlet temperature, pipe temperature sensor 414 is positioned over indoor set
The middle part of evaporator 412, for detecting middle portion temperature, pipe temperature sensor 416 is positioned over indoor machine evaporation 412 and exported, for examining
Survey outlet temperature.
Outlet temperature T1 is gathered by pipe temperature sensor 416, temperature sensor 410 gathers the environment temperature T2 of interior, meter
Calculate T1 and T2 difference T, judged by judging T size room air conditioner electric expansion valve whether failure.
Testing process as shown in figure 5, including：Step 502, opening is in electric expansion valve, detects room conditioning
Whether device receives self-checking command；Step 504, when air conditioner receives self-checking command indoors, control room air conditioner switching
To air supply pattern, under air supply pattern, electric expansion valve is closed；Step 506, room air conditioner is being detected under air supply pattern
When running the first preset duration, control room air conditioner switches to shutdown mode；Step 508, second is run under shutdown mode
Preset duration, so that residual refrigerant evaporation；Step 510, preset duration is run detecting room air conditioner under preset mode
When, the first temperature value T1 of collection and second temperature value T2；Step 512, the first temperature value of detection and the difference of second temperature value are
It is no to be more than or equal to the corresponding fiducial temperature threshold value of preset mode, if "Yes", into step 514, if "No", terminate process；Step
Rapid 514, electric expansion valve failure is determined, wherein, the first temperature value is the outlet temperature of heat exchanger, and second temperature value is Interior Space
Adjust the environment temperature residing for device.
In addition, the first temperature value T1 can also gather the inlet temperature or Guan Wen of evaporator 412 by pipe temperature sensor 408
Sensor 414 collection evaporator 412 internal temperature compared with preset temperature threshold value, come determine electric expansion valve whether failure.
In the present invention, term " first ", " second ", " the 3rd " are only used for the purpose described, and it is not intended that indicating
Or imply relative importance；Term " multiple " then refers to two or more, unless otherwise clear and definite restriction.Term " installation ",
The term such as " connected ", " connection ", " fixation " all should be interpreted broadly, for example, " connection " can be fixedly connected or can
Dismounting connection, or be integrally connected；" connected " can be joined directly together, and can also be indirectly connected to by intermediary.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In description of the invention, it is to be understood that the instruction such as term " on ", " under ", "left", "right", "front", "rear"
Orientation or position relationship are, based on orientation shown in the drawings or position relationship, to be for only for ease of the description present invention and simplification is retouched
State, rather than indicate or imply that the device or unit of meaning there must be specific direction, with specific azimuth configuration and operation,
It is thus impossible to be interpreted as limitation of the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that combining the embodiment or specific features, structure, material or the feature of example description is contained at least one reality of the invention
Apply in example or example.In this manual, identical embodiment or reality are not necessarily referring to the schematic representation of above-mentioned term
Example.Moreover, description specific features, structure, material or feature can in any one or more embodiments or example with
Suitable mode is combined.
The preferred embodiments of the present invention are these are only, are not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (11)
1. a kind of fault detection method of electric expansion valve, it is adaptable to multi-connected air conditioning system, the multi-connected air conditioning system bag
Room air conditioner is included, the room air conditioner is provided with heat exchanger and electric expansion valve, it is characterised in that methods described bag
Include：
Opening is in the electric expansion valve, detects whether the room air conditioner receives self-checking command；
When detecting the room air conditioner and receiving the self-checking command, the room air conditioner is controlled to enter self-inspection mould
Formula, in the Auto-Sensing Mode, the electric expansion valve is closed or aperture reduces；
When detecting the room air conditioner and running preset duration under the Auto-Sensing Mode, the first temperature value is gathered, with root
According to the relation of first temperature value and preset temperature threshold value, judge the electric expansion valve whether failure,
Wherein, first temperature value is the outlet temperature of the heat exchanger.
2. the fault detection method of electric expansion valve according to claim 1, it is characterised in that it is described detect it is described
When room air conditioner runs preset duration under the Auto-Sensing Mode, the first temperature value is gathered, with according to first temperature value
With the relation of preset temperature threshold value, judge the electric expansion valve whether failure, specifically include following steps：
When the heat exchanger is evaporator, when gathering first temperature value, synchronous acquisition second temperature value；
Detect whether the second temperature value and the difference of first temperature value are more than or equal to temperature difference threshold；
When detecting the difference more than or equal to the temperature difference threshold, the electric expansion valve failure is determined,
Wherein, the second temperature value be the room air conditioner residing for environment temperature, the second temperature value with it is described pre-
If the difference of temperature threshold is the temperature difference threshold.
3. the fault detection method of electric expansion valve according to claim 2, it is characterised in that it is described detect it is described
When room air conditioner receives the self-checking command, the room air conditioner is controlled to enter Auto-Sensing Mode, in the Auto-Sensing Mode
In, the electric expansion valve is closed or aperture reduces, and specifically includes following steps：
When the room air conditioner receives the self-checking command, the room air conditioner is controlled to switch to air supply pattern,
Under the air supply pattern, the electric expansion valve is closed；
When detecting the room air conditioner and running the first preset duration under the air supply pattern, the room conditioning is controlled
Device switches to shutdown mode, and runs under the shutdown mode the second preset duration, so that residual refrigerant evaporation,
Wherein, first preset duration is equal to the preset duration with the second preset duration sum.
4. the fault detection method of electric expansion valve according to any one of claim 1 to 3, it is characterised in that also wrap
Include：
It is determined that during the electric expansion valve failure, generating fault cues information.
5. the fault detection method of electric expansion valve according to claim 3, it is characterised in that also include：
When detecting the difference less than the temperature difference threshold, according to control signal, the electric expansion valve is opened.
6. a kind of failure detector of electric expansion valve, it is adaptable to multi-connected air conditioning system, the multi-connected air conditioning system bag
Room air conditioner is included, the room air conditioner is provided with heat exchanger and electric expansion valve, it is characterised in that described device bag
Include：
Detection unit, for being in opening in the electric expansion valve, detects whether the room air conditioner receives certainly
Inspection instruction；
Control unit, for when detecting the room air conditioner and receiving the self-checking command, controlling the room conditioning
Device enters Auto-Sensing Mode, in the Auto-Sensing Mode, the heat exchanger heating；
Collecting unit, for when detecting the room air conditioner and running preset duration under the Auto-Sensing Mode, collection the
One temperature value, with the relation according to first temperature value and preset temperature threshold value, judges whether the electric expansion valve is former
Barrier,；
Wherein, first temperature value is the outlet temperature of the heat exchanger.
7. the failure detector of electric expansion valve according to claim 6, it is characterised in that
The collecting unit is additionally operable to：When the heat exchanger is evaporator, when gathering first temperature value, synchronous acquisition
Second temperature value；
The detection unit is additionally operable to：Detect whether the second temperature value and the difference of first temperature value are more than or equal to
Temperature difference threshold；
The failure detector of the electric expansion valve also includes：
Determining unit, for when detecting the difference more than or equal to the temperature difference threshold, determining the electric expansion valve
Failure,
Wherein, the second temperature value be the room air conditioner residing for environment temperature, the second temperature value with it is described pre-
If the difference of temperature threshold is the temperature difference threshold.
8. the failure detector of electric expansion valve according to claim 7, it is characterised in that
Described control unit is additionally operable to：When the room air conditioner receives the self-checking command, the room conditioning is controlled
Device switches to air supply pattern, under the air supply pattern, and the electric expansion valve is closed；
Described control unit is additionally operable to：The first preset duration is run under the air supply pattern detecting the room air conditioner
When, control the room air conditioner to switch to shutdown mode, and the second preset duration is run under the shutdown mode, so that residual
Stay refrigerant evaporation,
Wherein, first preset duration is equal to the preset duration with the second preset duration sum.
9. the failure detector of the electric expansion valve according to any one of claim 6 to 8, it is characterised in that also wrap
Include：
Tip element, for it is determined that during the electric expansion valve failure, generating fault cues information.
10. the failure detector of electric expansion valve according to claim 8, it is characterised in that
Described control unit is additionally operable to：When detecting the difference less than the fiducial temperature threshold value, according to control signal, open
Open the electric expansion valve.
11. a kind of multi-connected air conditioning system, it is characterised in that including：
At least one outdoor air-conditioner；
Multiple room air conditioners, are connected at least one described outdoor air-conditioner,
Wherein, any one of room conditioning includes the event of the electric expansion valve as any one of claim 6 to 10
Hinder detection means.
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| CN201710313548.5A CN107084494B (en) | 2017-05-05 | 2017-05-05 | Fault detection method and device for electronic expansion valve and multi-connected air conditioning system |
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| CN113007880B (en) * | 2021-03-29 | 2022-05-27 | 珠海格力智能装备有限公司 | Detection method and device for air conditioner outdoor unit |
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| CN117309371A (en) * | 2023-11-30 | 2023-12-29 | 珠海格力电器股份有限公司 | Electronic expansion valve and fan module detection method of water source heat pump unit |
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