CN105485992B - Air-conditioning system and its deficient refrigerant detection method - Google Patents
Air-conditioning system and its deficient refrigerant detection method Download PDFInfo
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- CN105485992B CN105485992B CN201610012172.XA CN201610012172A CN105485992B CN 105485992 B CN105485992 B CN 105485992B CN 201610012172 A CN201610012172 A CN 201610012172A CN 105485992 B CN105485992 B CN 105485992B
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Classifications
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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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- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2500/00—Problems to be solved
- F25B2500/24—Low amount of refrigerant in the system
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
Abstract
The invention discloses a kind of deficient refrigerant detection methods of air-conditioning system comprising following steps：The back pressure of compressor is detected, and corresponding evaporation saturation temperature is obtained according to the back pressure of compressor；Obtain inlet superheat degree, the return-air degree of superheat of compressor and the discharge superheat of compressor of fluid reservoir；When evaporating saturation temperature less than preset value, if the inlet superheat degree of fluid reservoir is more than or equal to the first default degree of superheat, the return-air degree of superheat of compressor is more than or equal to the second default degree of superheat and the discharge superheat of compressor is more than or equal to third and presets the degree of superheat, judge that air-conditioning system occurs to owe refrigerant situation.Whether the deficient refrigerant detection method of the air-conditioning system can timely and accurately automatically detect air-conditioning system currently in deficient refrigerant state, it not only may remind the user that or maintenance personal carry out system overhaul with coolant adding in time, system can also be facilitated to carry out refrigerant adjusting automatically, and testing cost is cheap.The invention also discloses a kind of air-conditioning systems.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly to the deficient refrigerant detection method of a kind of air-conditioning system and a kind of sky
Adjusting system.
Background technology
In business air conditioner or domestic air conditioning, lacks refrigerant for anti-locking system and cause cooling system heating effect undesirable
Problem needs to be arranged for system and owes refrigerant signal testing function, in this way by owing refrigerant signal detection, can prompt user or
Maintenance personal carries out system overhaul to carry out filling refrigerant, can also pass through the valve body in regulating system flow path under certain operating modes
Combination control the flow direction of refrigerant, to adjust the ability output effect of machine in cooling and warming.
And it when owe refrigerant signal detection to air-conditioning system at present or detects not prompt enough accurate or needs into
This higher detection device, it is therefore desirable to which the deficient refrigerant detection technique of air-conditioning system is improved.
Invention content
The present invention is directed at least solve one of the technical problem in above-mentioned technology to a certain extent.For this purpose, the present invention
One purpose is to propose a kind of deficient refrigerant detection method of low cost detecting air-conditioning system promptly and accurately.
It is another object of the present invention to propose a kind of air-conditioning system.
In order to achieve the above objectives, a kind of deficient refrigerant detection method for air-conditioning system that one aspect of the present invention embodiment proposes,
Include the following steps：The back pressure of compressor in air-conditioning system is detected, and according to the acquisition pair of the back pressure of the compressor
The evaporation saturation temperature answered；Obtain the inlet superheat degree of fluid reservoir in the air-conditioning system, the return-air degree of superheat of the compressor
With the discharge superheat of the compressor；When the evaporation saturation temperature is less than preset value, if the entrance of the fluid reservoir
The degree of superheat be more than or equal to the first default degree of superheat, the return-air degree of superheat of the compressor be more than or equal to the second default degree of superheat and
The discharge superheat of the compressor is more than or equal to third and presets the degree of superheat, then judges that the air-conditioning system occurs to owe refrigerant feelings
Condition.
The deficient refrigerant detection method of air-conditioning system according to the ... of the embodiment of the present invention, first the return-air pressure by detecting compressor
Power obtains the inlet superheat degree of fluid reservoir, the return-air degree of superheat of compressor and compression to obtain corresponding evaporation saturation temperature
The discharge superheat of machine, then when evaporating saturation temperature less than preset value, time to the inlet superheat degree, compressor of fluid reservoir
The discharge superheat of the gas degree of superheat and compressor is judged, if the inlet superheat degree of fluid reservoir was preset more than or equal to first
The discharge superheat that temperature, the return-air degree of superheat of compressor are more than or equal to the second default degree of superheat and compressor is more than or equal to the
The three default degrees of superheat then judge that air-conditioning system occurs to owe refrigerant situation, so as to timely and accurately automatically detect air-conditioning system
Whether system current in refrigerant state is owed, not only may remind the user that or maintenance personal to carry out system overhaul in time cold to supplement
Matchmaker can also facilitate system to carry out refrigerant adjusting automatically, and testing cost is cheap, is brought convenience to user.
According to one embodiment of present invention, the inlet superheat degree of the fluid reservoir is obtained according to following formula：
ACSH=T6-Te,
Wherein, ACSH is the inlet superheat degree of the fluid reservoir, and T6 is the inlet temperature of the fluid reservoir, and Te is the steaming
Send out saturation temperature.
According to one embodiment of present invention, the return-air degree of superheat of the compressor is obtained according to following formula：
SSH=T7-Te,
Wherein, SSH is the return-air degree of superheat of the compressor, and T7 is the suction temperature of the compressor, and Te is the steaming
Send out saturation temperature.
According to one embodiment of present invention, the discharge superheat of the compressor is obtained according to following formula：
DSH=T71-Tc,
Wherein, DSH is the discharge superheat of the compressor, and T71 is the delivery temperature of the compressor, and Tc is the pressure
The corresponding exhaust saturation temperature of pressure at expulsion of contracting machine.
In an embodiment of the present invention, air-conditioning system test running in a chiller mode.
In order to achieve the above objectives, a kind of air-conditioning system that another aspect of the present invention embodiment proposes, including：Compressor；Four
Port valve, the first port of the four-way valve are connected with the exhaust outlet of compressor；Outdoor heat exchanger, the one of the outdoor heat exchanger
End is connected with the second port of the four-way valve；Throttle valve, one end of the throttle valve are another with the outdoor heat exchanger
End is connected；Indoor heat exchanger, one end of the indoor heat exchanger are connected with the other end of the throttle valve, and the interior is changed
The other end of hot device is connected with the third port of the four-way valve；Fluid reservoir, the entrance of the fluid reservoir and the four-way valve
The 4th port be connected, the outlet of the fluid reservoir is connected with the gas returning port of the compressor；Control module, the control
Module obtains entering for the fluid reservoir by detecting the back pressure of the compressor to obtain corresponding evaporation saturation temperature
The discharge superheat for the temperature, the return-air degree of superheat and the compressor of the compressor of making a slip of the tongue, and it is saturated temperature in the evaporation
When degree is less than preset value, if the inlet superheat degree of the fluid reservoir is more than or equal to the first default degree of superheat, the compressor
The return-air degree of superheat is more than or equal to the second default degree of superheat and the discharge superheat of the compressor is more than or equal to the default overheat of third
Degree, the control module then judge that the air-conditioning system occurs to owe refrigerant situation.
Air-conditioning system according to the ... of the embodiment of the present invention, control module is by detecting the back pressure of compressor to obtain correspondence
Evaporation saturation temperature, and obtain inlet superheat degree, the return-air degree of superheat of compressor and the discharge superheat of compressor of fluid reservoir
Degree, then when evaporating saturation temperature less than preset value, control module is to the inlet superheat degree of fluid reservoir, the return-air mistake of compressor
The discharge superheat of temperature and compressor is judged, if the inlet superheat degree of fluid reservoir is more than or equal to the first default overheat
It spends, the return-air degree of superheat of compressor is more than or equal to the second default degree of superheat and the discharge superheat of compressor is more than or equal to third
The default degree of superheat then judges that air-conditioning system occurs to owe refrigerant situation, so as to timely and accurately automatically detect it is current whether
In deficient refrigerant state, it not only may remind the user that or maintenance personal carry out system overhaul with coolant adding, acceptable side in time
Just system carries out refrigerant adjusting automatically, and testing cost is cheap, is brought convenience to user.
According to one embodiment of present invention, the control module obtains the fluid reservoir according to following formula and enters to make a slip of the tongue
Temperature：
ACSH=T6-Te,
Wherein, ACSH is the inlet superheat degree of the fluid reservoir, and T6 is the inlet temperature of the fluid reservoir, and Te is the steaming
Send out saturation temperature.
According to one embodiment of present invention, the control module obtains the return-air mistake of the compressor according to following formula
Temperature：
SSH=T7-Te,
Wherein, SSH is the return-air degree of superheat of the compressor, and T7 is the suction temperature of the compressor, and Te is the steaming
Send out saturation temperature.
According to one embodiment of present invention, the control module obtains the exhaust of the compressor according to following formula
Temperature：
DSH=T71-Tc,
Wherein, DSH is the discharge superheat of the compressor, and T71 is the delivery temperature of the compressor, and Tc is the pressure
The corresponding exhaust saturation temperature of pressure at expulsion of contracting machine.
In an embodiment of the present invention, air-conditioning system test running in a chiller mode.
Description of the drawings
Fig. 1 is the structural schematic diagram according to the air-conditioning system of one embodiment of the invention；And
Fig. 2 is the flow chart according to the deficient refrigerant detection method of the air-conditioning system of the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawings come describe the air-conditioning system proposed according to embodiments of the present invention deficient refrigerant detection method and
Air-conditioning system.
Fig. 1 is the structural schematic diagram according to the air-conditioning system of one embodiment of the invention.As shown in Figure 1, the air-conditioning system
Including compressor 1, four-way valve ST, outdoor heat exchanger 2, throttle valve 3, indoor heat exchanger 4, fluid reservoir 5 and control module 6.
Wherein, the first port of four-way valve ST is connected with the exhaust outlet of compressor 1, one end of outdoor heat exchanger 2 and four
The second port of port valve ST is connected, and one end of throttle valve 3 is connected with the other end of outdoor heat exchanger 2, indoor heat exchanger 4
One end is connected with the other end of throttle valve 3, and the other end of indoor heat exchanger 4 is connected with the third port of four-way valve ST, storage
The entrance of flow container 5 is connected with the 4th port of four-way valve ST, and the outlet of fluid reservoir 5 is connected with the gas returning port of compressor 1, control
Back pressure of the molding block 6 by detecting compressor 1 and obtains entering for fluid reservoir 5 to obtain corresponding evaporation saturation temperature Te
The discharge superheat for the temperature, the return-air degree of superheat and compressor 1 of compressor 1 of making a slip of the tongue, and be less than in advance in evaporation saturation temperature Te
If when value, if the inlet superheat degree of fluid reservoir 5 is more than or equal to the first default degree of superheat, the return-air degree of superheat of compressor 1 is more than
It is more than or equal to third equal to the discharge superheat of the second default degree of superheat and compressor 1 and presets the degree of superheat, control module 6 is then sentenced
Disconnected air-conditioning system occurs to owe refrigerant situation.
As shown in Figure 1, in cooling mode, after the pressure high temperature hot gas that compressor 1 comes out is condensed by outdoor heat exchanger 2
Become high pressure Normal Atmospheric Temperature Liquid, high pressure Normal Atmospheric Temperature Liquid becomes low-pressure low-temperature gas-liquid after throttle valve 3 such as electric expansion valve throttling
Mixture, low-pressure low-temperature gas-liquid mixture are becoming low-pressure low-temperature gas after the heat absorption of indoor heat exchanger 4, are then passing through storage again
Flow container 5 carries out gas-liquid separation, and the gas of final low-pressure low-temperature returns to the gas returning port of compressor 1.And in a heating mode, outdoor is changed
Hot device 2 is evaporator, and indoor heat exchanger 4 is condenser, keeps whole path direction opposite by four-way valve ST commutations.
In an embodiment of the present invention, it should be noted that in order to ensure to owe the accuracy of refrigerant detection, need air-conditioning system
Time of the system except the special operatings such as non-defrosting oil return operation carries out judgement detection.Specifically, can be passed by back pressure
Sensor LP detects the back pressure of compressor, wherein back pressure sensor LP may be provided at the inlet of fluid reservoir 5, control
Molding block 6 obtains corresponding evaporation saturation temperature Te under back pressure, and by the way that the pressure at expulsion in 1 exhaust outlet of compressor is arranged
Sensor HP detects the pressure at expulsion of compressor 1, and control module 6 obtains corresponding exhaust saturation temperature Tc under pressure at expulsion,
Then the inlet temperature T6 that fluid reservoir is detected by the way that the temperature sensor in 5 inlet of fluid reservoir is arranged, by being arranged in liquid storage
Temperature sensor between the outlet and the gas returning port of compressor 1 of tank 5 exports suction temperature into compressor to detect fluid reservoir
T7 detects the delivery temperature T71 of compressor, so as to calculate by the way that the temperature sensor in exhaust outlet of compressor is arranged
To the inlet superheat degree ACSH, the return-air degree of superheat SSH of compressor and the discharge superheat DSH of compressor of fluid reservoir.
In this way, control module 6 can obtain the inlet superheat degree of fluid reservoir according to following formula：ACSH=T6-Te, wherein
ACSH is the inlet superheat degree of the fluid reservoir, and T6 is the inlet temperature of the fluid reservoir, and Te is the evaporation saturation temperature.And
And control module 6 can obtain the return-air degree of superheat of the compressor according to following formula：SSH=T7-Te, wherein SSH is institute
The return-air degree of superheat of compressor is stated, T7 is the suction temperature of the compressor, and Te is the evaporation saturation temperature.And control mould
Block 6 can obtain the discharge superheat of the compressor according to following formula：DSH=T71-Tc, wherein DSH is the compressor
Discharge superheat, T71 is the delivery temperature of the compressor, and Tc is that the corresponding exhaust of pressure at expulsion of the compressor is saturated
Temperature.
Therefore, in an embodiment of the present invention, control module 6 passes through to corresponding evaporation saturation temperature under back pressure
The discharge superheat DSH progress of Te, the inlet superheat degree ACSH of fluid reservoir, the return-air degree of superheat SSH of compressor and compressor
Judge promptly and accurately to detect whether air-conditioning system occurs to owe refrigerant situation, so as to remind user or maintenance personal in time
System is overhauled to carry out filling refrigerant, solving the problems, such as air-conditioning system, refrigerant signal is owed in detection automatically, and can be facilitated
System automatic adjustment, remote monitoring and repair etc..
According to one embodiment of present invention, when whether detection air-conditioning system owes refrigerant, air-conditioning system is in a chiller mode
Test running, in other words, air-conditioning system is under test running in a chiller mode, when evaporating saturation temperature Te less than preset value A values, it was demonstrated that
Air-conditioning system low pressure is too low, and air-conditioning system takes out refrigerant difficulty, and the inlet superheat degree ACSH of fluid reservoir can be very big at this time, is greater than
First default degree of superheat B values are greater than the second default degree of superheat C if the return-air degree of superheat SSH of compressor is also very big simultaneously
Value, then it is that refrigerant is seldom in empty or fluid reservoir to demonstrate in fluid reservoir.In this case if the pressure at expulsion of compressor is low,
But delivery temperature is relatively high, that is, the discharge superheat DSH for showing as compressor is also very big, is greater than third and presets degree of superheat D
Thus value then can determine whether that entire air-conditioning system is in the state of deficient refrigerant.
In an embodiment of the present invention, air-conditioning system can be domestic air conditioner, can also be the commercializations such as multi-line system
Air conditioner.
In conclusion air-conditioning system according to the ... of the embodiment of the present invention, the back pressure that control module passes through detection compressor
To obtain corresponding evaporation saturation temperature, and obtain the inlet superheat degree of fluid reservoir, the return-air degree of superheat of compressor and compressor
Discharge superheat, then when evaporating saturation temperature and being less than preset value, control module is to the inlet superheat degree of fluid reservoir, compression
The return-air degree of superheat of machine and the discharge superheat of compressor are judged, if the inlet superheat degree of fluid reservoir is more than or equal to first
The default degree of superheat, the return-air degree of superheat of compressor are more than or equal to the second default degree of superheat and the discharge superheat of compressor is more than
The degree of superheat is preset equal to third, then judges that air-conditioning system occurs to owe refrigerant situation, so as to timely and accurately automatically detect
It is current not only to may remind the user that whether in refrigerant state is owed or maintenance personal carries out system overhaul with coolant adding in time,
System can also be facilitated to carry out refrigerant adjusting automatically, and testing cost is cheap, be brought convenience to user.
Fig. 2 is the flow chart according to the deficient refrigerant detection method of the air-conditioning system of the embodiment of the present invention.As shown in Fig. 2, should
Detection method includes the following steps for the deficient refrigerant of air-conditioning system：
S1 detects the back pressure of compressor in air-conditioning system, and obtains corresponding steaming according to the back pressure of compressor
Send out saturation temperature Te.
According to one embodiment of present invention, the back pressure of compressor can be detected by back pressure sensor LP,
Wherein, back pressure sensor LP may be provided at the inlet of fluid reservoir, the in this way back pressure by detecting compressor
Obtain corresponding evaporation saturation temperature Te under back pressure.
S2 obtains inlet superheat degree, the return-air degree of superheat of compressor and the exhaust of compressor of fluid reservoir in air-conditioning system
The degree of superheat.
Wherein, the exhaust pressure of compressor can be detected by the way that the back pressure transducer HP in exhaust outlet of compressor is arranged
Power, to obtain corresponding exhaust saturation temperature Tc under pressure at expulsion, and by the way that the temperature sensing in fluid reservoir inlet is arranged
Device detects the inlet temperature T6 of fluid reservoir, and the temperature by being arranged between the outlet of fluid reservoir and the gas returning port of compressor
Sensor exports suction temperature T7 into compressor to detect fluid reservoir, by the way that the temperature sensor in exhaust outlet of compressor is arranged
To detect the delivery temperature T71 of compressor.In this way, the inlet superheat degree of fluid reservoir can be obtained according to following formula：ACSH=T6-
Te, wherein ACSH is the inlet superheat degree of the fluid reservoir, and T6 is the inlet temperature of the fluid reservoir, and Te is that the evaporation is full
And temperature.And the return-air degree of superheat of the compressor can be obtained according to following formula：SSH=T7-Te, wherein SSH is described
The return-air degree of superheat of compressor, T7 are the suction temperature of the compressor, and Te is the evaporation saturation temperature.And can according to
Lower formula obtains the discharge superheat of the compressor：DSH=T71-Tc, wherein DSH is the discharge superheat of the compressor
Degree, T71 are the delivery temperature of the compressor, and Tc is the corresponding exhaust saturation temperature of pressure at expulsion of the compressor.
S3 is preset when evaporating saturation temperature less than preset value if the inlet superheat degree of fluid reservoir is more than or equal to first
The degree of superheat, the return-air degree of superheat of compressor are more than or equal to the second default degree of superheat and the discharge superheat of compressor is more than or equal to
Third presets the degree of superheat, then judges that air-conditioning system occurs to owe refrigerant situation.
According to one embodiment of present invention, when whether detection air-conditioning system owes refrigerant, air-conditioning system is in a chiller mode
Test running, in other words, air-conditioning system is under test running in a chiller mode, when evaporating saturation temperature Te less than preset value A values, it was demonstrated that
Air-conditioning system low pressure is too low, and air-conditioning system takes out refrigerant difficulty, and the inlet superheat degree ACSH of fluid reservoir can be very big at this time, is greater than
First default degree of superheat B values are greater than the second default degree of superheat C if the return-air degree of superheat SSH of compressor is also very big simultaneously
Value, then it is that refrigerant is seldom in empty or fluid reservoir to demonstrate in fluid reservoir.In this case if the pressure at expulsion of compressor is low,
But delivery temperature is relatively high, that is, the discharge superheat DSH for showing as compressor is also very big, is greater than third and presets degree of superheat D
Thus value then can determine whether that entire air-conditioning system is in the state of deficient refrigerant.
The deficient refrigerant detection method of air-conditioning system according to the ... of the embodiment of the present invention, first the return-air pressure by detecting compressor
Power obtains the inlet superheat degree of fluid reservoir, the return-air degree of superheat of compressor and compression to obtain corresponding evaporation saturation temperature
The discharge superheat of machine, then when evaporating saturation temperature less than preset value, time to the inlet superheat degree, compressor of fluid reservoir
The discharge superheat of the gas degree of superheat and compressor is judged, if the inlet superheat degree of fluid reservoir was preset more than or equal to first
The discharge superheat that temperature, the return-air degree of superheat of compressor are more than or equal to the second default degree of superheat and compressor is more than or equal to the
The three default degrees of superheat then judge that air-conditioning system occurs to owe refrigerant situation, so as to timely and accurately automatically detect air-conditioning system
Whether system current in refrigerant state is owed, not only may remind the user that or maintenance personal to carry out system overhaul in time cold to supplement
Matchmaker can also facilitate system to carry out refrigerant adjusting automatically, and testing cost is cheap, is brought convenience to user.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (8)
1. a kind of deficient refrigerant detection method of air-conditioning system, which is characterized in that include the following steps：
When the air-conditioning system test running in a chiller mode, the back pressure of compressor in air-conditioning system is detected, and according to institute
The back pressure for stating compressor obtains corresponding evaporation saturation temperature；
Obtain the inlet superheat degree of fluid reservoir in the air-conditioning system, the return-air degree of superheat of the compressor and the compressor
Discharge superheat；
When the evaporation saturation temperature is less than preset value, preset if the inlet superheat degree of the fluid reservoir is more than or equal to first
The degree of superheat, the return-air degree of superheat of the compressor are more than or equal to the discharge superheat of the second default degree of superheat and the compressor
The degree of superheat is preset more than or equal to third, then judges that the air-conditioning system occurs to owe refrigerant situation.
2. the deficient refrigerant detection method of air-conditioning system according to claim 1, which is characterized in that obtained according to following formula
The inlet superheat degree of the fluid reservoir：
ACSH=T6-Te,
Wherein, ACSH is the inlet superheat degree of the fluid reservoir, and T6 is the inlet temperature of the fluid reservoir, and Te is that the evaporation is full
And temperature.
3. the deficient refrigerant detection method of air-conditioning system according to claim 1, which is characterized in that obtained according to following formula
The return-air degree of superheat of the compressor：
SSH=T7-Te,
Wherein, SSH is the return-air degree of superheat of the compressor, and T7 is the suction temperature of the compressor, and Te is that the evaporation is full
And temperature.
4. the deficient refrigerant detection method of air-conditioning system according to claim 1, which is characterized in that obtained according to following formula
The discharge superheat of the compressor：
DSH=T71-Tc,
Wherein, DSH is the discharge superheat of the compressor, and T71 is the delivery temperature of the compressor, and Tc is the compressor
The corresponding exhaust saturation temperature of pressure at expulsion.
5. a kind of air-conditioning system, which is characterized in that including：
Compressor；
Four-way valve, the first port of the four-way valve are connected with the exhaust outlet of compressor；
Outdoor heat exchanger, one end of the outdoor heat exchanger are connected with the second port of the four-way valve；
Throttle valve, one end of the throttle valve are connected with the other end of the outdoor heat exchanger；
Indoor heat exchanger, one end of the indoor heat exchanger are connected with the other end of the throttle valve, the indoor heat exchanger
The other end be connected with the third port of the four-way valve；
Fluid reservoir, the entrance of the fluid reservoir are connected with the 4th port of the four-way valve, the outlet of the fluid reservoir and institute
The gas returning port for stating compressor is connected；
Control module, the control module is in the air-conditioning system test running in a chiller mode, by detecting the compressor
Back pressure to obtain corresponding evaporation saturation temperature, and obtain the inlet superheat degree of the fluid reservoir, the compressor
The discharge superheat of the return-air degree of superheat and the compressor, and when the evaporation saturation temperature is less than preset value, if institute
The inlet superheat degree for stating fluid reservoir is more than or equal to the first default degree of superheat, the return-air degree of superheat of the compressor is more than or equal to second
The discharge superheat of the default degree of superheat and the compressor is more than or equal to third and presets the degree of superheat, and the control module then judges
The air-conditioning system occurs to owe refrigerant situation.
6. air-conditioning system according to claim 5, which is characterized in that described in the control module is obtained according to following formula
The inlet superheat degree of fluid reservoir：
ACSH=T6-Te,
Wherein, ACSH is the inlet superheat degree of the fluid reservoir, and T6 is the inlet temperature of the fluid reservoir, and Te is that the evaporation is full
And temperature.
7. air-conditioning system according to claim 5, which is characterized in that described in the control module is obtained according to following formula
The return-air degree of superheat of compressor：
SSH=T7-Te,
Wherein, SSH is the return-air degree of superheat of the compressor, and T7 is the suction temperature of the compressor, and Te is that the evaporation is full
And temperature.
8. air-conditioning system according to claim 5, which is characterized in that described in the control module is obtained according to following formula
The discharge superheat of compressor：
DSH=T71-Tc,
Wherein, DSH is the discharge superheat of the compressor, and T71 is the delivery temperature of the compressor, and Tc is the compressor
The corresponding exhaust saturation temperature of pressure at expulsion.
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| CN106545973B (en) * | 2016-11-29 | 2019-07-26 | 广东美的暖通设备有限公司 | Multi-line system and its coolant quantity determination method |
| CN106765973B (en) * | 2017-01-03 | 2020-06-30 | 青岛海尔空调器有限总公司 | Control method for fluorine deficiency detection of air conditioner and air conditioner |
| CN108895733B (en) * | 2018-09-19 | 2021-05-25 | 广东美的暖通设备有限公司 | Refrigerant filling method and device |
| CN109708272A (en) * | 2018-12-29 | 2019-05-03 | 广东美的暖通设备有限公司 | The control method of the electric expansion valve of outer machine in parallel |
| CN109708271A (en) * | 2018-12-29 | 2019-05-03 | 广东美的暖通设备有限公司 | The control method and its device of outer machine system in parallel |
| CN112856716B (en) * | 2021-01-15 | 2022-05-17 | 广东美的暖通设备有限公司 | Air conditioning system and refrigerant state detection method and device thereof |
| CN114963528B (en) * | 2021-06-29 | 2023-08-18 | 青岛海尔新能源电器有限公司 | Refrigerant detection method, device, equipment and storage medium |
| CN114484919A (en) * | 2022-02-25 | 2022-05-13 | 珠海格力电器股份有限公司 | Air conditioning system and control method |
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