CN105841413B - Air-conditioner control method and device - Google Patents
Air-conditioner control method and device Download PDFInfo
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- CN105841413B CN105841413B CN201610190079.8A CN201610190079A CN105841413B CN 105841413 B CN105841413 B CN 105841413B CN 201610190079 A CN201610190079 A CN 201610190079A CN 105841413 B CN105841413 B CN 105841413B
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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
- F25B49/022—Compressor control arrangements
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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
- F25B2500/05—Cost reduction
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of air-conditioner control method, including step：According to the saturated-steam temperature of condenser and the correspondence of preset saturated-steam temperature and saturated vapour pressure, the saturated vapour pressure of condenser is obtained；Calculate the current pressure drop between compressor air-discharging and condenser saturated vapor under current operating conditions；The saturated vapour pressure of the current pressure drop and condenser is summed, obtains compressor current exhaust pressure；When compressor current exhaust pressure is more than the first preset pressure threshold value, control compressor is out of service.The invention also discloses a kind of air conditioner controlling devices.Present invention reduces the costs for safeguarding air conditioner normal operation.
Description
Technical field
The present invention relates to air conditioner technical field more particularly to air-conditioner control methods and device.
Background technology
With the development of science and technology, air conditioner has become the necessity of people's daily life.During air conditioner normal operation, pressure
Contracting machine pressure at expulsion can maintain setup pressure value hereinafter, in the prior art, in order to safeguard air conditioner normal operation, usually pressing
High voltage protective is set to switch on contracting machine gas exhaust piping, when monitoring that Compressor Discharge Pressure is higher than setup pressure value, then high pressure
Protection switch disconnects, and cuts off the power supply of control loop；Or feedback cut-off signal is controlled by electric-controlled plate and shut down to electric-controlled plate, from
And it plays a protective role to air conditioner.But setting employs high voltage protective switch, needs to increase hardware in air conditioner, causes to safeguard
The cost of air conditioner normal operation is higher.
Invention content
It is a primary object of the present invention to propose a kind of air-conditioner control method and device, it is intended to solve existing to safeguard air-conditioning
The technical issues of cost of device normal operation is higher.
To achieve the above object, the present invention provides a kind of air-conditioner control method, the air-conditioner control method include with
Lower step：
It is closed according to the saturated-steam temperature of condenser and preset saturated-steam temperature are corresponding with saturated vapour pressure
System obtains the saturated vapour pressure of condenser；
Calculate the current pressure drop between compressor air-discharging and condenser saturated vapor under current operating conditions；
The saturated vapour pressure of the current pressure drop and condenser is summed, obtains compressor current exhaust pressure；
When the compressor current exhaust pressure is more than the first preset pressure threshold value, control compressor is out of service.
Preferably, the current pressure drop calculated under current operating conditions between compressor air-discharging and condenser saturated vapor
The step of include：
Obtain the rated voltage drop and compressor current operating conditions pair between compressor air-discharging and condenser saturated vapor
The pressure-drop coefficient answered；
The rated voltage drop is multiplied by the pressure-drop coefficient, obtains working as between compressor air-discharging and condenser saturated vapor
Preceding pressure drop.
Preferably, it is described according to the saturated-steam temperature of condenser and preset saturated-steam temperature and saturated vapor
The correspondence of pressure before the step of obtaining the saturated vapour pressure of condenser, further includes：
Obtain the vapor (steam) temperature that the multiple temperature-detecting devices set in saturated vapor region in condenser detect；
The mean temperature of the multiple vapor (steam) temperatures obtained is calculated, is steamed the mean temperature as the saturation of condenser
Stripping temperature.
Preferably, it is described when the compressor current exhaust pressure is more than the first preset pressure threshold value, control compressor
Step out of service includes：
The compressor actual exhaust air pressure of the compressor current exhaust pressure of acquisition and pressure tool detection is carried out
Compare；
It is less than in the compressor current exhaust pressure and the pressure absolute value of the difference of the compressor actual exhaust air pressure
Or during equal to the second preset pressure threshold value, judge the compressor current exhaust pressure for virtual value；
It is virtual value, and the compressor current exhaust pressure is more than first and presets in the compressor current exhaust pressure
During pressure threshold, control compressor is out of service.
Preferably, the compressor current exhaust pressure by acquisition and the practical row of compressor of pressure tool detection
After the step of atmospheric pressure is compared, further include：
It is more than in the compressor current exhaust pressure and the pressure absolute value of the difference of the compressor actual exhaust air pressure
During the second preset pressure threshold value, return perform it is described obtain condenser saturated vapour pressure the step of.
In addition, to achieve the above object, the present invention also proposes a kind of air conditioner controlling device, the air conditioner controlling device
Including：
Acquisition module steams for the saturated-steam temperature according to condenser and preset saturated-steam temperature with saturation
The correspondence of steam pressure obtains the saturated vapour pressure of condenser；
First computing module, for calculating working as between compressor air-discharging and condenser saturated vapor under current operating conditions
Preceding pressure drop；
Second computing module for the saturated vapour pressure of the current pressure drop and condenser to be summed, obtains compressor
Current exhaust pressure；
Control module, for when the compressor current exhaust pressure is more than the first preset pressure threshold value, control to be compressed
Machine is out of service.
Preferably, first computing module includes：
Acquiring unit, for obtaining the rated voltage drop and compressor between compressor air-discharging and condenser saturated vapor
The corresponding pressure-drop coefficient of current operating conditions；
Computing unit for the rated voltage drop to be multiplied by the pressure-drop coefficient, obtains compressor air-discharging and satisfies with condenser
Current pressure drop between steam.
Preferably, the acquisition module is additionally operable to：
Obtain the vapor (steam) temperature that the multiple temperature-detecting devices set in saturated vapor region in condenser detect；
The mean temperature of the multiple vapor (steam) temperatures obtained is calculated, is steamed the mean temperature as the saturation of condenser
Stripping temperature.
Preferably, the control module includes：
Comparing unit, for the compressor current exhaust pressure and the compressor reality of pressure tool detection that will be obtained
Pressure at expulsion is compared；
Judging unit, in the pressure differential of the compressor current exhaust pressure and the compressor actual exhaust air pressure
Absolute value be less than or equal to the second preset pressure threshold value when, judge the compressor current exhaust pressure for virtual value；
Control unit, for being virtual value in the compressor current exhaust pressure, and the compressor current exhaust pressure
When power is more than the first preset pressure threshold value, control compressor is out of service.
Preferably, described control unit is additionally operable to：
It is more than in the compressor current exhaust pressure and the pressure absolute value of the difference of the compressor actual exhaust air pressure
During the second preset pressure threshold value, control acquisition module reacquires the saturated vapour pressure of condenser.
Air-conditioner control method and device proposed by the present invention, when air conditioner is run, first according to the saturation of condenser
Vapor (steam) temperature obtains the saturated vapour pressure of condenser, then will currently be pressed between compressor air-discharging and condenser saturated vapor
Drop is summed with the saturated vapour pressure of condenser, obtains compressor current exhaust pressure, excessively high in compressor current exhaust pressure
When stop compressor operating, it is achieved thereby that be not required to high voltage protective switch can safeguard air conditioner normal operation, reduce maintenance
The cost of air conditioner normal operation.
Description of the drawings
Fig. 1 is the flow diagram of air-conditioner control method first embodiment of the present invention；
Fig. 2 be air-conditioner control method second embodiment of the present invention in calculating current operating conditions under compressor air-discharging with it is cold
The refinement flow diagram of current pressure drop between condenser saturated vapor；
Fig. 3 is to be more than first in the compressor current exhaust pressure in air-conditioner control method second embodiment of the present invention
During preset pressure threshold value, control compressor refinement flow diagram out of service；
Fig. 4 is the high-level schematic functional block diagram of air conditioner controlling device first embodiment of the present invention；
Fig. 5 is the refinement function module signal of the first computing module in air conditioner controlling device second embodiment of the present invention
Figure；
Fig. 6 is the refinement high-level schematic functional block diagram of control module in air conditioner controlling device second embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of air-conditioner control method, and with reference to Fig. 1, Fig. 1 is real for air-conditioner control method first of the present invention
Apply the flow diagram of example.
In the present embodiment, which includes the following steps：
Step S10, according to the saturated-steam temperature of condenser and preset saturated-steam temperature and saturated vapour pressure
Correspondence, obtain the saturated vapour pressure of condenser；
In the present embodiment, when air conditioner is run, when refrigerant from during gaseous state becomes liquid, obtains in condenser
Saturated-steam temperature Tsc in condenser corresponding to refrigerant.Since saturated-steam temperature and saturated vapour pressure are a pair of in one
It should be related to, as the saturated-steam temperature Tsc for getting condenser, according to preset saturated-steam temperature and saturated vapour pressure
Correspondence, obtain the saturated vapour pressure P (Tsc) of corresponding condenser.For example, inquire preset condenser saturated vapor
Temperature and saturated vapour pressure relation table obtain the corresponding saturated vapour pressure P of saturated-steam temperature Tsc of the condenser
(Tsc)。
Step S20 calculates the current pressure drop between compressor air-discharging and condenser saturated vapor under current operating conditions；
In the present embodiment, the drop formula of tube runs can be used：
Δ Pc=λ ﹙ ρ gl/d ﹚ ﹙ v2/ 2g ﹚=λ ﹙ l/ ρ d ﹚ ﹙ m2/ 2 ﹚=Km2,
Calculate the current pressure drop Δ Pc between compressor air-discharging and condenser saturated vapor under current operating conditions.Its
In, ρ is refrigerant density, and l is duct length of the compressor air-discharging nozzle to condenser, and d is caliber, and v is refrigerant than volume,
M is current refrigerant mass fluxes, and λ and K are coefficient.
Step S30 sums the saturated vapour pressure of the current pressure drop and condenser, obtains compressor current exhaust pressure
Power；
According to the current pressure drop Δ under the current operating conditions got between compressor air-discharging and condenser saturated vapor
The corresponding saturated vapour pressure P (Tsc) of the saturated-steam temperature Tsc of Pc and the condenser got, will be described current
The saturated vapour pressure P (Tsc) of pressure drop Δ Pc and condenser sums, and obtains compressor current exhaust pressure Pd=P (Tsc)+Δ
Pc。
Step S40, when the compressor current exhaust pressure is more than the first preset pressure threshold value, control compressor stops
Operation.
After compressor current exhaust pressure Pd is got, the fortune of compressor is controlled according to compressor current exhaust pressure Pd
Row state.Specifically, in the present embodiment, Compressor Discharge Pressure is provided with the first preset pressure threshold value Ps1.Work as acquisition
To after compressor current exhaust pressure Pd, compare compressor current exhaust pressure Pd and the first preset pressure threshold value Ps1's
Size, judges whether compressor current exhaust pressure Pd is more than the first preset pressure threshold value Ps1, when compressor current exhaust
When pressure Pd is more than the first preset pressure threshold value Ps1 namely illustrate that Compressor Discharge Pressure is excessively high under current operating conditions,
At this point, corresponding control signal is sent to electric-controlled plate.When electric-controlled plate receives the control signal, control compressor stops fortune
Row.When compressor current exhaust pressure Pd is less than or equal to the first preset pressure threshold value Ps1 namely the current operation of explanation
Compressor Discharge Pressure is in normal range (NR) under state, and compressor is maintained to continue to run with current operating status.
Air-conditioner control method provided in this embodiment, when air conditioner is run, according to the saturated-steam temperature of condenser,
And the correspondence of preset saturated-steam temperature and saturated vapour pressure obtains the saturated vapour pressure of condenser, meanwhile,
The current pressure drop between compressor air-discharging and condenser saturated vapor under current operating conditions is calculated, then by the current pressure drop
It sums with the saturated vapour pressure of condenser, compressor current exhaust pressure is obtained, so as to fulfill according to compressor current exhaust
Pressure control compressor operating status, while air conditioner normal operation is protected, avoid using high voltage protective switch come
Compressor Discharge Pressure is detected, reduces the cost for safeguarding air conditioner normal operation.
Further, as shown in Fig. 2, proposing air-conditioner control method second embodiment of the present invention based on first embodiment.
In the present embodiment, the step S20 includes：
Step S21, the rated voltage drop and compressor obtained between compressor air-discharging and condenser saturated vapor are currently transported
The corresponding pressure-drop coefficient of row state；
The rated voltage drop is multiplied by the pressure-drop coefficient, obtains compressor air-discharging and condenser saturated vapor by step S22
Between current pressure drop.
In the present embodiment, can dispatch from the factory parameter previously according to air conditioner, using the pressure drop of the tube runs in first embodiment
Formula calculates rated voltage drop Δ of the air conditioner under declared working condition between corresponding compressor air-discharging and condenser saturated vapor
Prated=Kmrated 2, wherein, mratedFor the refrigerant mass fluxes under declared working condition, Δ Prated is fixed value.
Due to Δ Pc=Km2, therefore, Δ Pc/ Δ Prated=﹙ m/m can be calculatedrated﹚2.Meanwhile according to current operation
Refrigerant mass fluxes m and refrigerant mass fluxes m under declared working condition under stateratedCorrespondence m=β mrated, wherein, β
For coefficient, in different operating statuses, the corresponding numerical values reciteds of β are different, obtain the corresponding pressure of compressor current operating conditions
Factor alpha=Δ Pc/ Δ Prated=﹙ m/m droprated﹚2=﹙ β mrated/mrated﹚2=β2。
When getting rated voltage drop Δ Prated between compressor air-discharging and condenser saturated vapor and compressor is worked as
After the corresponding pressure-drop coefficient α of preceding operating status, the rated voltage drop Δ Prated is multiplied by the pressure-drop coefficient α, obtains compression
Machine is vented the current pressure drop Δ Pc between condenser saturated vapor：
Δ Pc=α Δ Prated=β2·ΔPrated。
Further, in the present embodiment, before the step S10, step is further included：
Step a obtains the steaming that the multiple temperature-detecting devices set in saturated vapor region in condenser detect
Stripping temperature；
Step b calculates the mean temperature of multiple vapor (steam) temperatures of acquisition, using the mean temperature as condenser
Saturated-steam temperature.
In the present embodiment, when air conditioner is run, in order to get the saturated vapour pressure of condenser, it is necessary to first get
The saturated-steam temperature of condenser.When in condenser refrigerant from during gaseous state becomes liquid, it is first determined in condenser
Region where saturated vapor, for example, condenser when being operated under different operating modes using fluent software sunykatuib analysis air conditioners
Thermo parameters method, determine the region where saturated vapor in condenser.It is and more in determining saturated vapor region setting
A temperature sensor, by multiple temperature sensors of setting obtain saturated vapor region multiple vapor (steam) temperature Tsc1,
Tsc2、Tsc3…TscN(N≥2).Then the averaging of multiple vapor (steam) temperature Tsc1, Tsc2, Tsc3 ... TscN to getting,
Mean temperature (Tsc1+Tsc2+Tsc3+ ...+TscN)/N of the multiple vapor (steam) temperature is calculated, the mean temperature of acquisition will be calculated
As the saturated-steam temperature Tsc of condenser, i.e.,
Tsc=(Tsc1+Tsc2+Tsc3+ ...+TscN)/N.
After the saturated-steam temperature Tsc for having got condenser, steamed further according to preset saturated-steam temperature and saturation
The correspondence of steam pressure obtains the saturated vapour pressure P (Tsc) of corresponding condenser.
Further, as shown in figure 3, in the present embodiment, the step S40 includes：
Step S41, by the compressor current exhaust pressure of acquisition and the compressor actual exhaust air of pressure tool detection
Pressure is compared；
Step S42, in the exhausted of the compressor current exhaust pressure and the pressure differential of the compressor actual exhaust air pressure
When being less than or equal to the second preset pressure threshold value to value, judge the compressor current exhaust pressure for virtual value；
Step S43 is virtual value, and the compressor current exhaust pressure is more than in the compressor current exhaust pressure
During the first preset pressure threshold value, control compressor is out of service.
In the present embodiment, when by the current pressure drop Δ Pc between the compressor air-discharging got and condenser saturated vapor with
Saturated vapour pressure P (Tsc) summations of condenser, after getting compressor current exhaust pressure Pd, in order to be somebody's turn to do to what is got
The accuracy of compressor current exhaust pressure Pd is tested, and compressor actual exhaust air pressure Pt is detected using pressure tool,
Then will calculate the compressor actual exhaust air pressure Pt of the compressor current exhaust pressure Pd that gets and pressure tool detection into
Row compares, the compressor current exhaust pressure Pd obtained with verification.Specifically, in the present embodiment, it is default to be additionally provided with second
Pressure threshold Ps2.If the compressor current exhaust pressure Pd got and the compressor actual exhaust air pressure of pressure tool detection
The pressure absolute value of the difference of Pt is less than or equal to the second preset pressure threshold value Ps2 namely the compressor current exhaust pressure got
Error between power Pd and the compressor actual exhaust air pressure Pt of pressure tool detection is got in the range of default error threshold
Compressor current exhaust pressure Pd accuracy it is higher, then judge that the compressor current exhaust pressure Pd got is effective
Value.It is virtual value, and compressor current exhaust pressure Pd is more than the first preset pressure threshold in compressor current exhaust pressure Pd
During value Ps1, corresponding control signal is sent to electric-controlled plate.When electric-controlled plate receives the control signal, control compressor stops
Only run.
Further, in the present embodiment, it after the step S50, further includes：
Step c, in the absolute of the compressor current exhaust pressure and the pressure differential of the compressor actual exhaust air pressure
When value is more than the second preset pressure threshold value, returns and perform the step S10.
The compressor current exhaust pressure Pd got and the compressor actual exhaust air pressure of pressure tool detection will calculated
After power Pt is compared, if the compressor current exhaust pressure Pd got and the compressor actual exhaust air pressure of pressure tool detection
The pressure absolute value of the difference of power Pt is more than the second preset pressure threshold value Ps2 namely compressor current exhaust pressure Pd got
Error between the compressor actual exhaust air pressure Pt of pressure tool detection is more than default error threshold range, then judges to obtain
The compressor current exhaust pressure Pd arrived is invalid value, needs to be updated the numerical value of compressor current exhaust pressure Pd and repair
Just.Specifically, the region in condenser where saturated vapor can be redefined, so as to recalculate the saturated vapor temperature of condenser
Tsc is spent, the saturated-steam temperature Tsc of condenser is modified.And according to revised saturated-steam temperature Tsc and in advance
If saturated-steam temperature and saturated vapour pressure correspondence, obtain the saturated vapour pressure P of updated condenser
(Tsc).It again will be between the saturated vapour pressure P (Tsc) and compressor air-discharging and condenser saturated vapor of updated condenser
Current pressure drop Δ Pc summation, obtain updated compressor current exhaust pressure Pd, make updated compressor current exhaust
Pressure Pd and the pressure absolute value of the difference of compressor actual exhaust air pressure Pt detected are less than or equal to the second preset pressure threshold
Value Ps2, so as to correct compressor current exhaust pressure Pd.
Air-conditioner control method provided in this embodiment passes through get compressor air-discharging and condenser in advance and steam
Between rated voltage drop, after then getting corresponding pressure-drop coefficient according to current operating conditions, which is multiplied by volume
Constant pressure drop can get the current pressure drop between compressor air-discharging and condenser saturated vapor, and current pressure is obtained so as to simplify
The operation of drop, therefore also improve the efficiency for obtaining compressor current exhaust pressure.
The present invention further provides a kind of air conditioner controlling device, as shown in figure 4, Fig. 4 is air conditioner of the present invention control dress
Put the high-level schematic functional block diagram of first embodiment.
In the present embodiment, which includes：
Acquisition module 10, for the saturated-steam temperature according to condenser and preset saturated-steam temperature and saturation
The correspondence of steam pressure obtains the saturated vapour pressure of condenser；
In the present embodiment, when air conditioner is run, when refrigerant from during gaseous state becomes liquid, obtains in condenser
Module 10 obtains the saturated-steam temperature Tsc corresponding to refrigerant in condenser.Due to saturated-steam temperature and saturated vapor pressure
Power is in one-to-one relationship, as the saturated-steam temperature Tsc for getting condenser, according to preset saturated-steam temperature with satisfying
With the correspondence of steam pressure, acquisition module 10 obtains the saturated vapour pressure P (Tsc) of corresponding condenser.For example, inquiry
Preset condenser saturated-steam temperature and saturated vapour pressure relation table obtain the saturated-steam temperature Tsc of the condenser
Corresponding saturated vapour pressure P (Tsc).
First computing module 20, for calculating under current operating conditions between compressor air-discharging and condenser saturated vapor
Current pressure drop；
In the present embodiment, the drop formula of tube runs can be used in computing module 20：
Δ Pc=λ ﹙ ρ gl/d ﹚ ﹙ v2/ 2g ﹚=λ ﹙ l/ ρ d ﹚ ﹙ m2/ 2 ﹚=Km2,
Calculate the current pressure drop Δ of the saturated vapour pressure of Compressor Discharge Pressure and condenser under current operating conditions
Pc.Wherein, ρ is refrigerant density, and l is duct length of the compressor air-discharging nozzle to condenser, and d is caliber, and v is refrigerant ratio
Volume, m are current refrigerant mass fluxes, and λ and K are coefficient.
Second computing module 30 for the saturated vapour pressure of the current pressure drop and condenser to be summed, obtains compression
Machine current exhaust pressure；
According to the current pressure drop Δ under the current operating conditions got between compressor air-discharging and condenser saturated vapor
The corresponding saturated vapour pressure P (Tsc) of the saturated-steam temperature Tsc of Pc and the condenser got, second calculates mould
Block 30 sums the saturated vapour pressure P (Tsc) of the current pressure drop Δ Pc and condenser, obtains compressor current exhaust pressure
Pd=P (Tsc)+Δ Pc.
Control module 40, for when the compressor current exhaust pressure is more than the first preset pressure threshold value, control to be pressed
Contracting machine is out of service.
After compressor current exhaust pressure Pd is got, control module 40 is controlled according to compressor current exhaust pressure Pd
The operating status of compressor.Specifically, in the present embodiment, Compressor Discharge Pressure is provided with the first preset pressure threshold value
Ps1.After compressor current exhaust pressure Pd is got, control module 40 compares compressor current exhaust pressure Pd and described the
The size of one preset pressure threshold value Ps1, judges whether compressor current exhaust pressure Pd is more than the first preset pressure threshold value
Ps1 when compressor current exhaust pressure Pd is more than the first preset pressure threshold value Ps1 namely illustrates current operating conditions
Lower Compressor Discharge Pressure is excessively high, at this point, control module 40 sends corresponding control signal to electric-controlled plate.When electric-controlled plate receives
During the control signal, control compressor is out of service.When compressor current exhaust pressure Pd is less than or equal to described first in advance
If during pressure threshold Ps1 namely illustrating that Compressor Discharge Pressure is in normal range (NR) under current operating conditions, control module 40 is tieed up
Compressor is held to continue to run with current operating status.
Air conditioner controlling device provided in this embodiment, when air conditioner is run, acquisition module 10 is according to the full of condenser
And vapor (steam) temperature and the correspondence of preset saturated-steam temperature and saturated vapour pressure obtain the saturated vapor of condenser
Pressure, meanwhile, the first computing module 20 calculates working as between compressor air-discharging and condenser saturated vapor under current operating conditions
Preceding pressure drop, the second computing module 30 sum the saturated vapour pressure of the current pressure drop and condenser, and it is current to obtain compressor
Pressure at expulsion, control module 40 control the operating status of compressor according to compressor current exhaust pressure, in protection air conditioner just
Often while operation, avoid and Compressor Discharge Pressure is detected using high voltage protective switch, reduce the cost of air conditioner.
Further, as shown in figure 5, proposing air conditioner controlling device second embodiment of the present invention based on first embodiment.
In the present embodiment, first computing module 20 includes：
Acquiring unit 21, for obtaining rated voltage drop and the compression between compressor air-discharging and condenser saturated vapor
The corresponding pressure-drop coefficient of machine current operating conditions；
Computing unit 22 for the rated voltage drop to be multiplied by the pressure-drop coefficient, obtains compressor air-discharging and condenser
Current pressure drop between saturated vapor.
In the present embodiment, can dispatch from the factory parameter previously according to air conditioner, using the pressure drop of the tube runs in first embodiment
Formula calculates rated voltage drop Δ of the air conditioner under declared working condition between corresponding compressor air-discharging and condenser saturated vapor
Prated=Kmrated 2, wherein, mratedFor the refrigerant mass fluxes under declared working condition, Δ Prated is fixed value.
Due to Δ Pc=Km2, therefore, Δ Pc/ Δ Prated=﹙ m/m can be calculatedrated﹚2.Meanwhile according to current operation
Refrigerant mass fluxes m and refrigerant mass fluxes m under declared working condition under stateratedCorrespondence m=β mrated, wherein, β
For coefficient, in different operating statuses, the corresponding numerical values reciteds of β are different, and acquiring unit 21 obtains compressor and currently runs shape
The corresponding pressure-drop coefficient α of state=Δ Pc/ Δ Prated=﹙ m/mrated﹚2=﹙ β mrated/mrated﹚2=β2。
When acquiring unit 21 gets the rated voltage drop Δ Prated between compressor air-discharging and condenser saturated vapor, with
And after the corresponding pressure-drop coefficient α of compressor current operating conditions, the rated voltage drop Δ Prated is multiplied by institute by computing unit 22
Pressure-drop coefficient α is stated, obtains the current pressure drop Δ Pc=α Δs Prated=between compressor air-discharging and condenser saturated vapor
β2·ΔPrated。
Further, in the present embodiment, the acquisition module 10 is additionally operable to：
Obtain the vapor (steam) temperature that the multiple temperature-detecting devices set in saturated vapor region in condenser detect；
The mean temperature of the multiple vapor (steam) temperatures obtained is calculated, is steamed the mean temperature as the saturation of condenser
Stripping temperature.
In the present embodiment, when air conditioner is run, in order to get the saturated vapour pressure of condenser, it is necessary to first get
The saturated-steam temperature of condenser.When refrigerant is from during gaseous state becomes liquid in condenser, acquisition module 10 is first really
The region where saturated vapor in condenser is determined, for example, acquisition module 10 is using the operation of fluent software sunykatuib analyses air conditioner
The thermo parameters method of condenser when under different operating modes determines the region where saturated vapor in condenser.It is and full what is determined
Multiple temperature sensors are set with steam region, acquisition module 10 obtains saturation by multiple temperature sensors of setting and steams
Multiple vapor (steam) temperature Tsc1, Tsc2, Tsc3 ... TscN (N >=2) of vapour region.Then multiple vapor (steam) temperatures to getting
The averaging of Tsc1, Tsc2, Tsc3 ... TscN calculate the mean temperature (Tsc1+Tsc2+Tsc3+ ... of the multiple vapor (steam) temperature
+ TscN)/N, saturated-steam temperature Tsc of the mean temperature as condenser of acquisition will be calculated, i.e.,
Tsc=(Tsc1+Tsc2+Tsc3+ ...+TscN)/N.
After acquisition module 10 has got the saturated-steam temperature Tsc of condenser, further according to preset saturated vapor temperature
The correspondence of degree and saturated vapour pressure obtains the saturated vapour pressure P (Tsc) of corresponding condenser.
Further, as shown in fig. 6, in the present embodiment, the control module 40 includes：
Comparing unit 41, for the compressor current exhaust pressure and the compressor reality of pressure tool detection that will be obtained
Border pressure at expulsion is compared；
Judging unit 42, in the pressure of the compressor current exhaust pressure and the compressor actual exhaust air pressure
When absolute value of the difference is less than or equal to the second preset pressure threshold value, judge the compressor current exhaust pressure for virtual value；
Control unit 43, for being virtual value in the compressor current exhaust pressure, and the compressor current exhaust
When pressure is more than the first preset pressure threshold value, control compressor is out of service.
In the present embodiment, when the second computing module 30 is by the Compressor Discharge Pressure got and the saturated vapor of condenser
The current pressure drop Δ Pc of pressure and the saturated vapour pressure P (Tsc) of condenser sum, and get compressor current exhaust pressure Pd
Afterwards, it in order to test to the accuracy of compressor current exhaust pressure Pd got, detects to press using pressure tool
Contracting machine actual exhaust air pressure Pt's, the compressor current exhaust pressure Pd that comparing unit 41 gets calculating examines with pressure tool
The compressor actual exhaust air pressure Pt of survey is compared, the compressor current exhaust pressure Pd obtained with verification.Specifically, at this
In embodiment, it is additionally provided with the second preset pressure threshold value Ps2.If the compressor current exhaust pressure Pd and pressure tool that get
The pressure absolute value of the difference of the compressor actual exhaust air pressure Pt of detection be less than or equal to the second preset pressure threshold value Ps2 namely
Error between the compressor actual exhaust air pressure Pt of compressor current exhaust pressure Pd and pressure tool detection got exists
In the range of default error threshold, the accuracy of compressor current exhaust pressure Pd got is higher, then judging unit 42 judges
The compressor current exhaust pressure Pd got is virtual value.Judge compressor current exhaust pressure Pd to have in judging unit 42
Valid value, and compressor current exhaust pressure Pd be more than the first preset pressure threshold value Ps1 when, control unit 43 sends corresponding control
Signal processed is to electric-controlled plate.When electric-controlled plate receives the control signal, control compressor is out of service.
Further, in the present embodiment, described control unit 43 is additionally operable to：
It is more than in the compressor current exhaust pressure and the pressure absolute value of the difference of the compressor actual exhaust air pressure
During the second preset pressure threshold value, control acquisition module reacquires the saturated vapour pressure of condenser.
The compressor current exhaust pressure Pd got and the compressor of pressure tool detection will be calculated in comparing unit 41
After actual exhaust air pressure Pt is compared, if the compressor current exhaust pressure Pd got and the compressor of pressure tool detection
The compressor that the pressure absolute value of the difference of actual exhaust air pressure Pt is more than the second preset pressure threshold value Ps2 namely gets is current
Error between pressure at expulsion Pd and the compressor actual exhaust air pressure Pt of pressure tool detection is more than default error threshold range,
Then judging unit 42 judges the compressor current exhaust pressure Pd got as invalid value, at this point, control unit 43 is to compressor
The numerical value of current exhaust pressure Pd is updated amendment.Specifically, control unit 43 controls acquisition module 10 to redefine condensation
Region in device where saturated vapor, so as to recalculate the saturated-steam temperature Tsc of condenser, to the saturated vapor of condenser
Temperature Tsc is modified.And it is steamed according to revised saturated-steam temperature Tsc and preset saturated-steam temperature with saturation
The correspondence of steam pressure obtains the saturated vapour pressure P (Tsc) of updated condenser.Second computing module 30 will update
Current pressure drop Δ Pc between the saturated vapour pressure P (Tsc) and compressor air-discharging and condenser saturated vapor of condenser afterwards
Summation, obtains updated compressor current exhaust pressure Pd, makes updated compressor current exhaust pressure Pd with detecting
Compressor actual exhaust air pressure Pt pressure absolute value of the difference be less than or equal to the second preset pressure threshold value Ps2, so as to correct
Compressor current exhaust pressure Pd.
Air conditioner controlling device provided in this embodiment gets compressor air-discharging by acquiring unit 21 and satisfies with condenser
Rated voltage drop between steam, and after getting corresponding pressure-drop coefficient according to current operating conditions, computing unit 22 should
Pressure-drop coefficient, which is multiplied by rated voltage drop, can get current pressure drop between compressor air-discharging and condenser saturated vapor, so as to letter
Change the operation for obtaining current pressure drop, therefore also improve the efficiency for obtaining compressor current exhaust pressure.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow shift that bright specification and accompanying drawing content are made directly or indirectly is used in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. a kind of air-conditioner control method, which is characterized in that the air-conditioner control method includes the following steps：
According to the saturated-steam temperature of condenser and the correspondence of preset saturated-steam temperature and saturated vapour pressure,
Obtain the saturated vapour pressure of condenser；
Calculate the current pressure drop between compressor air-discharging and condenser saturated vapor under current operating conditions；
The saturated vapour pressure of the current pressure drop and condenser is summed, obtains compressor current exhaust pressure；
The compressor actual exhaust air pressure that the compressor current exhaust pressure of acquisition is detected with pressure tool is compared；
It is less than or waits in the pressure absolute value of the difference of the compressor current exhaust pressure and the compressor actual exhaust air pressure
When the second preset pressure threshold value, judge the compressor current exhaust pressure for virtual value；
It is virtual value, and the compressor current exhaust pressure is more than the first preset pressure in the compressor current exhaust pressure
During threshold value, control compressor is out of service.
2. air-conditioner control method as described in claim 1, which is characterized in that compressor under the calculating current operating conditions
The step of current pressure drop being vented between condenser saturated vapor, includes：
Rated voltage drop and compressor current operating conditions between acquisition compressor air-discharging and condenser saturated vapor is corresponding
Pressure-drop coefficient；
The rated voltage drop is multiplied by the pressure-drop coefficient, obtains the current pressure between compressor air-discharging and condenser saturated vapor
Drop.
3. air-conditioner control method as described in claim 1, which is characterized in that the saturated vapor temperature according to condenser
Degree and the correspondence of preset saturated-steam temperature and saturated vapour pressure, obtain the saturated vapour pressure of condenser
Before step, further include：
Obtain the vapor (steam) temperature that the multiple temperature-detecting devices set in saturated vapor region in condenser detect；
The mean temperature of the multiple vapor (steam) temperatures obtained is calculated, using the mean temperature as the saturated vapor temperature of condenser
Degree.
4. air-conditioner control method as described in claim 1, which is characterized in that the compressor by acquisition is when front row
After the step of atmospheric pressure and the compressor actual exhaust air pressure of pressure tool detection are compared, further include：
It is more than second in the pressure absolute value of the difference of the compressor current exhaust pressure and the compressor actual exhaust air pressure
During preset pressure threshold value, return perform it is described obtain condenser saturated vapour pressure the step of.
5. a kind of air conditioner controlling device, which is characterized in that the air conditioner controlling device includes：
Acquisition module, for the saturated-steam temperature according to condenser and preset saturated-steam temperature and saturated vapor pressure
The correspondence of power obtains the saturated vapour pressure of condenser；
First computing module, for calculating the current pressure under current operating conditions between compressor air-discharging and condenser saturated vapor
Drop；
For the saturated vapour pressure of the current pressure drop and condenser to be summed, it is current to obtain compressor for second computing module
Pressure at expulsion；
Control module, for when the compressor current exhaust pressure is more than the first preset pressure threshold value, control compressor to stop
Only run；
The control module includes：
Comparing unit, for the compressor current exhaust pressure and the compressor actual exhaust air of pressure tool detection that will be obtained
Pressure is compared；
Judging unit, in the exhausted of the compressor current exhaust pressure and the pressure differential of the compressor actual exhaust air pressure
When being less than or equal to the second preset pressure threshold value to value, judge the compressor current exhaust pressure for virtual value；
Control unit, for being virtual value, and the compressor current exhaust pressure is big in the compressor current exhaust pressure
When the first preset pressure threshold value, control compressor is out of service.
6. air conditioner controlling device as claimed in claim 5, which is characterized in that first computing module includes：
Acquiring unit, it is current for obtaining rated voltage drop between compressor air-discharging and condenser saturated vapor and compressor
The corresponding pressure-drop coefficient of operating status；
Computing unit for the rated voltage drop to be multiplied by the pressure-drop coefficient, obtains compressor air-discharging and is steamed with condenser saturation
Current pressure drop between vapour.
7. air conditioner controlling device as claimed in claim 5, which is characterized in that the acquisition module is additionally operable to：
Obtain the vapor (steam) temperature that the multiple temperature-detecting devices set in saturated vapor region in condenser detect；
The mean temperature of the multiple vapor (steam) temperatures obtained is calculated, using the mean temperature as the saturated vapor temperature of condenser
Degree.
8. air conditioner controlling device as claimed in claim 5, which is characterized in that described control unit is additionally operable to：
It is more than second in the pressure absolute value of the difference of the compressor current exhaust pressure and the compressor actual exhaust air pressure
During preset pressure threshold value, control acquisition module reacquires the saturated vapour pressure of condenser.
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| CN110207332A (en) * | 2019-06-11 | 2019-09-06 | 珠海格力电器股份有限公司 | The pressure detection method and air conditioner of air conditioner |
| CN113719930B (en) * | 2021-08-09 | 2022-06-07 | 宁波奥克斯电气股份有限公司 | Exhaust pressure adjusting method and device and air conditioner |
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