CN108562077A - A kind of steady increasing enthalpy method - Google Patents
A kind of steady increasing enthalpy method Download PDFInfo
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- CN108562077A CN108562077A CN201810388095.7A CN201810388095A CN108562077A CN 108562077 A CN108562077 A CN 108562077A CN 201810388095 A CN201810388095 A CN 201810388095A CN 108562077 A CN108562077 A CN 108562077A
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- increasing enthalpy
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- 238000000034 method Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000007613 environmental effect Effects 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000005057 refrigeration Methods 0.000 abstract description 20
- 238000002347 injection Methods 0.000 description 34
- 239000007924 injection Substances 0.000 description 34
- 239000000243 solution Substances 0.000 description 14
- 238000004378 air conditioning Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- 230000002045 lasting effect Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
-
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
Abstract
The present invention provides a kind of steady increasing enthalpy method, ensures that refrigeration system increasing enthalpy steadily carries out by the control of valve body aperture, increasing enthalpy is avoided frequently to open or close.Including：Step 1, obtains delivery temperature and leaving water temperature in unit running process, and discharge superheat is obtained according to delivery temperature and leaving water temperature；Step 2, judges whether discharge superheat is more than discharge superheat setting value；Step 3 obtains current environmental temperature when discharge superheat is more than discharge superheat setting value, and main valve aperture and auxiliary valve opening, which are adjusted to valve body, according to current environmental temperature sets aperture；Step 4, unit press the operation of valve body setting aperture after a certain period of time, detect current exhaust gas temperature；Step 5, judges whether current exhaust gas temperature is more than or equal to delivery temperature；Step 6 gradually turns main valve aperture down or increases auxiliary valve opening being reached the limit values less than delivery temperature or main valve aperture and auxiliary valve opening until meeting current exhaust gas temperature when current exhaust gas temperature is greater than or equal to delivery temperature.
Description
Technical field
The present invention relates to technical field of air-conditioning heat pumps more particularly to a kind of steady increasing enthalpy methods.
Background technology
Existing air-conditioning heat pump product improves the stabilization that product is run under bad working environments to reduce product delivery temperature
Property, usually condensator outlet refrigerant is divided into two, primary flow path refrigerant flows to evaporator heat absorption evaporation, and secondary flow road refrigerant flows to pressure
Contracting machine hydrojet or air injection enthalpy-increasing reduce compressor exhaust temperature.
Existing air injection enthalpy-increasing technology has and will import and export beating for refrigerant degree of superheat control auxiliary electron expansion valve by increasing enthalpy valve
On or off is closed, and when the degree of superheat is more than maximum set value, electric expansion valve turns down, when the degree of superheat is less than minimum setting value
When, electric expansion valve is opened greatly, and when the degree of superheat is between the minimum value and maximum value of setting, electronic expansion valve opening is kept not
Become, auxiliary electron expansion valve is just closed when compressor air-discharging drops to setting value.
Existing air injection enthalpy-increasing technology also by delivery temperature and leaving water temperature control auxiliary electron expansion valve opening or
It closes, when discharge superheat is more than system maximum set value, increasing enthalpy valve opens air injection enthalpy-increasing, when discharge superheat is less than system
When minimum setting value, increasing enthalpy valve is closed, and when discharge superheat is between the minimum value and maximum value of setting, the holding of increasing enthalpy valve is worked as
Preceding aperture continuous service.
And the increasing enthalpy mouth of existing air injection enthalpy-increasing compressor is each provided at the middle pressure chamber of compressor, the pressure of middle pressure chamber is not one
Steady state value, there are cyclic fluctuations for the pressure value, and the size of pressure value is related with evaporating temperature and condensation temperature, only auxiliary electricity
Refrigeration system could continue air injection enthalpy-increasing when son expansion inlet pressure is more than compressor increasing enthalpy mouth maximum pressure value.
As seen from the above, the prior art neither can guarantee that refrigeration system is normally carried out air injection enthalpy-increasing, can not control valve
Body continued smooth increasing enthalpy causes refrigeration system frequently to open increasing enthalpy or closes increasing enthalpy, influences the heating of air-conditioning heat pump product in this way
Amount, Energy Efficiency Ratio, service life and comfort.
Invention content
The present invention provides a kind of steady increasing enthalpy method, is controlled by above-mentioned valve body aperture, it is ensured that refrigeration system increasing enthalpy is steady
It carries out, increasing enthalpy is avoided frequently to open or close, improve air-conditioning heat pump product heating capacity, Energy Efficiency Ratio and service life.
A kind of technical solution of steady increasing enthalpy method of the present invention includes：
Step 1 obtains delivery temperature and leaving water temperature in unit running process, and according to the delivery temperature and goes out
Coolant-temperature gage obtains discharge superheat；
Step 2, judges whether the discharge superheat is more than discharge superheat setting value；
Step 3 obtains current environmental temperature when the discharge superheat is more than the discharge superheat setting value, and
Main valve aperture and auxiliary valve opening are adjusted to valve body according to the current environmental temperature and set aperture；
Step 4, unit after a certain period of time, detect current exhaust gas temperature by the operation of valve body setting aperture；
Step 5, judges whether the current exhaust gas temperature is more than or equal to the delivery temperature；
Step 6 is gradually turned the main valve down and is opened when the current exhaust gas temperature is greater than or equal to the delivery temperature
The auxiliary valve opening is spent or increased until meeting current exhaust gas temperature less than delivery temperature or the main valve aperture and the auxiliary valve
Aperture reaches the limit values.
Preferably, in the technical solution of above-mentioned steady increasing enthalpy method,
Further include step 7, when the current exhaust gas temperature is less than the delivery temperature, calculates temperature drop rate.
Preferably, in the technical solution of above-mentioned steady increasing enthalpy method,
In the step 7, the temperature drop rate is the difference of both the current exhaust gas temperature and described delivery temperature
With the ratio of run time.
Preferably, in the technical solution of above-mentioned steady increasing enthalpy method,
Further include step 8, judge whether the temperature drop rate is less than or equal to system temperature drop setting value, if so, unit is pressed
Present valve body aperture is run.
Preferably, in the technical solution of above-mentioned steady increasing enthalpy method,
The step 8 further includes, if the temperature drop rate is more than the system temperature drop setting value, gradually turning down described auxiliary
Valve opening is until the temperature drop rate meets the system temperature drop setting value or the auxiliary valve opening reaches the limit values.
Preferably, in the technical solution of above-mentioned steady increasing enthalpy method,
The step 1 specifically includes：The delivery temperature and leaving water temperature in unit running process are obtained, institute is calculated
The temperature gap between delivery temperature and leaving water temperature is stated, the temperature gap is the discharge superheat.
Preferably, in the technical solution of above-mentioned steady increasing enthalpy method,
The step is a kind of, and the row in unit running process is obtained by exhaust gas temperature sensor and leaving water temperature sensors
Temperature degree and leaving water temperature.
Preferably, in the technical solution of above-mentioned steady increasing enthalpy method,
In step 6, the main valve aperture is successively decreased according to equal difference functions, and the auxiliary valve opening is according to equal difference increases.
The invention discloses a kind of steady increasing enthalpy methods in air conditioner heat pump system, are controlled according to discharge superheat and are arranged
The difference that temperature degree subtracts leaving water temperature carries out opening or closing for control increasing enthalpy, is set most when its difference is more than discharge superheat
When big value, increasing enthalpy is opened；When its difference, which is less than discharge superheat, sets minimum value, increasing enthalpy is closed.When unit meet increasing enthalpy into
When entering condition, the duty parameters such as detection current environmental temperature, when refrigeration system enters air injection enthalpy-increasing, valve body aperture regulation to valve body
Set aperture.After system enters air injection enthalpy-increasing, control system is by detecting the variation tendency of delivery temperature come control bound aperture
With auxiliary valve opening, controlled by above-mentioned valve body aperture, it is ensured that refrigeration system increasing enthalpy steadily carries out, and increasing enthalpy is avoided frequently to play on or off
It closes, improves air-conditioning heat pump product heating capacity, Energy Efficiency Ratio and service life.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow chart of steady increasing enthalpy method of the present invention.
Specific implementation mode
The present invention provides a kind of steady increasing enthalpy method, is controlled by above-mentioned valve body aperture, it is ensured that refrigeration system increasing enthalpy is steady
It carries out, increasing enthalpy is avoided frequently to open or close, improve air-conditioning heat pump product heating capacity, Energy Efficiency Ratio and service life.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The technical scheme comprises the following steps for a kind of steady increasing enthalpy method of the present invention：
Step 1 101, the delivery temperature Tq0 in acquisition unit running process and leaving water temperature Twc0, according to delivery temperature
Tq0 and leaving water temperature Twc0 obtain discharge superheat.
After air conditioner and heat pump unit booting operation, control system is real-time by exhaust gas temperature sensor and leaving water temperature sensors
Detect the delivery temperature Tq0 of the compressor and leaving water temperature Twc0 of heat supply end in operational process.
The discharge superheat of compressor is obtained according to delivery temperature Tq0 and leaving water temperature Twc0, specifically, obtaining exhaust temperature
The temperature gap between Tq0 and leaving water temperature Twc0 is spent, which is discharge superheat, i.e. discharge superheat=Tq0-
Twc0。
Run in setting range to effectively control delivery temperature, the steady increasing enthalpy method by detect delivery temperature and
Opening or closing for the difference control air injection enthalpy-increasing of leaving water temperature, i.e., subtract water outlet according to discharge superheat i.e. delivery temperature
The difference of temperature is controlled.
Step 2 102 judges whether discharge superheat is more than discharge superheat setting value.
Leaving water temperature Twc0 is subtracted by the delivery temperature Tq0 detected in step 1 101, and discharge superheat is calculated
Afterwards, and with the discharge superheat setting value Ps0 of systemic presupposition it is compared size.Discharge superheat setting value Ps0 can be
Interval value, when its difference, which is more than discharge superheat, sets maximum value, increasing enthalpy is opened；When its difference is set less than discharge superheat
When minimum value, increasing enthalpy is closed.
Step 3 103, when discharge superheat be more than discharge superheat setting value when, obtain current environmental temperature, according to institute
It states current environmental temperature and main valve aperture and auxiliary valve opening is adjusted to valve body setting aperture.
According to the explanation in step 2 102, as (Tq0-Twc0) ＞ Ps0max, i.e., discharge superheat is more than the degree of superheat most
When big setting value Ps0max, when unit meets increasing enthalpy entry condition, control system then detects current environmental temperature Trt, different
Environment temperature has preset valve body setting aperture, i.e., is divided into main valve aperture and auxiliary valve opening according to duty parameter several
Regional value.It is understood that the valve body setting aperture Pzr corresponding to current environmental temperature Trt and Pfr, that is, system default
Value, is transferred to Pzr, auxiliary valve opening is transferred to Pfr by main valve aperture.
After step 4 104, unit press valve body setting aperture operation certain time t, current exhaust gas temperature Tqt is detected.
In order to which valve body aperture is quickly transferred to rational increasing enthalpy opening value, which is joined by operating modes such as environment temperatures
Air injection enthalpy-increasing main valve aperture and auxiliary valve opening are divided into several regional values by number, in order to detect according to valve selected by current environmental temperature
Body aperture can air injection enthalpy-increasing and reduce delivery temperature, the increasing enthalpy method enter air injection enthalpy-increasing after continue to run with certain time,
Then detection current exhaust gas temperature situation of change carrys out application valve body aperture.
Control system according to environment temperature Trt mix up valve body setting aperture after, refrigeration system press valve body setting aperture Pzr and
After Pfr runs certain time t, control system then detects current exhaust gas temperature Tqt.The unit operation time, t >=Ts, Ts were system
Presetting run time.
Step 5 105, judges whether current exhaust gas temperature Tqt is more than or equal to delivery temperature Tq0.
According to the current exhaust gas temperature Tqt detected in step 4 104 compared with delivery temperature Tq0 size, delivery temperature
Tq0 is increasing enthalpy front exhaust temperature.
If Tqt ＜ Tq0 illustrate that refrigeration system is normally carried out air injection enthalpy-increasing, delivery temperature is begun to decline.
If Tqt >=Tq0, illustrate that refrigeration system cannot carry out air injection enthalpy-increasing, delivery temperature can not reduce, at this time refrigeration system
It needs auxiliary to adjust by adjusting main valve aperture (main electronic expansion valve opening) and auxiliary valve opening (auxiliary electron expansion valve opening)
Electric expansion valve inlet pressure and compressor increasing enthalpy mouth pressure are helped, by establishing pressure difference, auxiliary electron expansion valve inlet pressure is big
Unit could normal air injection enthalpy-increasing when compressor increasing enthalpy mouth pressure.
Step 6 106, when current exhaust gas temperature Tqt be greater than or equal to delivery temperature Tq0, gradually turn main valve aperture or increasing down
Big auxiliary valve opening reaches capacity until meeting current exhaust gas temperature Tqt less than delivery temperature Tq0 or main valve aperture and auxiliary valve opening
Value.
In order to ensure auxiliary electron expansion valve inlet pressure is more than compressor increasing enthalpy mouth pressure value, system enters air injection enthalpy-increasing
Afterwards, control system controls main electric expansion valve and auxiliary electron expansion valve opening by detecting the variation tendency of delivery temperature,
Increase auxiliary electron expansion valve inlet pressure by reducing main valve aperture or increasing auxiliary valve opening, by increase main valve aperture or
Reduce auxiliary valve opening to reduce auxiliary electron expansion valve inlet pressure.
As Tqt >=Tq0, air conditioner heat pump system realizes that air injection enthalpy-increasing, i.e. air conditioner heat pump system are logical by establishing pressure difference
It crosses and is gradually reduced main valve aperture or increases auxiliary valve opening to increase auxiliary electron expansion valve inlet pressure, until Tqt ＜ Tq0, real
Existing air injection enthalpy-increasing and drop degassing function.
The mode that pressure difference is established is as follows：
As Tqt >=Tq0, control system first by main valve aperture (main electronic expansion valve opening) by Pzr by Δ Pz valves walk by
It gradually turns down until the main valve aperture after Tqt ＜ Tq0 or adjustment is not less than the main valve opening amount region corresponding to current environmental temperature Trt
The minimum value Pzmin of value.It is understood that main valve aperture is according to Pzt=Pzr-n Δ Pz tune valve, (n is to adjust valve number, Δ Pz
For preset main valve tune valve step number), which keeps main valve aperture smaller and smaller, but the main valve aperture after adjusting is not less than working as front ring
The minimum value Pzmin of regional value corresponding to the temperature Trt of border.
After main valve aperture often turns Δ Pz down, control system runs certain time t, then detects current exhaust gas temperature at this time
Tqt, and judge the relationship between Tqt and Tq0.
If Tqt ＜ Tq0, illustrate that refrigeration system can carry out air injection enthalpy-increasing, delivery temperature is begun to decline, and main valve aperture is pressed
Pzt is carried out, and auxiliary valve opening is carried out by Pfr.If Tqt >=Tq0, illustrate that refrigeration system can't be normally carried out air injection enthalpy-increasing, main valve
Aperture need to continue to reduce, and main valve aperture is continued to turn down by Δ Pz valves step, until delivery temperature occurs declining or main valve aperture is equal to
Until main electronic expansion opening amount region minimum opening value Pzmin corresponding to current environmental temperature Trt.
As main valve aperture Pzt=Pzmin, Tqt >=Tq0 illustrates that delivery temperature does not decline, and needs to pass through increase at this time
Auxiliary valve opening is adjusted, and control system is gradually increased auxiliary valve opening by Δ Pf valves step up to Tqt ＜ Tq0, or adjustment by Pfr
Maximum value Pfmax of the auxiliary valve opening afterwards no more than the auxiliary valve opening regional value corresponding to current environmental temperature Trt.It is appreciated that
, auxiliary valve opening, should according to Pft=Pfr+m Δ Pf tune valve (m is to adjust valve number, and Δ Pf is preset auxiliary valve tune valve step number)
Control keeps auxiliary valve opening increasing, but the auxiliary valve opening after adjustment is no more than the regional value corresponding to current environmental temperature Trt
In maximum value Pfmax.
Similarly, after auxiliary valve opening often increases Δ Pf, control system run certain time t, then detect at this time when front row
Temperature degree Tqt, and judge the relationship between Tqt and Tq0.
If Tqt ＜ Tq0, illustrate that refrigeration system can carry out air injection enthalpy-increasing, delivery temperature is begun to decline, and auxiliary valve opening is pressed
Pft is carried out.If Tqt >=Tq0, illustrate that refrigeration system can't be normally carried out air injection enthalpy-increasing, auxiliary valve opening need to continue to increase, auxiliary valve
Aperture is continued to increase by Δ Pf valves step, until delivery temperature occur declining or main valve aperture to be equal to current environmental temperature Trt institutes right
Until answering auxiliary electron expansion opening amount region maximum opening value Pfmax.
Increase auxiliary electron expansion valve inlet pressure above by reducing main valve aperture or increasing auxiliary valve opening, realizes spray
Gas increasing enthalpy and drop degassing function.Certainly, when the valve body aperture system adjusted according to environment temperature Trt can not normal air injection enthalpy-increasing
When, control system can also first increase auxiliary valve opening Pft, until exhaust occurs declining or auxiliary valve opening is equal to current environmental temperature
Until the maximum value Pfmax in auxiliary valve opening regional value corresponding to Trt, then it is adjusted by reducing main valve aperture, directly
It is reduced to delivery temperature or main valve aperture is equal to the minimum value in the main valve opening amount region value corresponding to current environmental temperature Trt
Until.
In the above-mentioned technical solutions, the valve body aperture or regulation valve body aperture selected by environment temperature meet air injection enthalpy-increasing
After being vented with drop, delivery temperature is possible to the bad phenomenons such as rapid decrease or rapid increase occur.There is frequency in air injection enthalpy-increasing control
It is numerous to open or close phenomenon.In order to reduce jet amount, it is ensured that delivery temperature stable operation in reasonable region, the increasing enthalpy continue to lead to
It crosses persistently increasing enthalpy technology to be implemented, i.e., maintains air conditioner heat pump system lasting by adjusting the jet amount of air injection enthalpy-increasing and steady
Operation.
After judging whether current exhaust gas temperature Tqt is more than or equal to delivery temperature Tq0 in step 5 105, it can also be performed
Step 7 107 calculates temperature drop rate when current exhaust gas temperature Tqt is less than delivery temperature Tq0.
When current exhaust gas temperature Tqt is less than delivery temperature Tq0, that is, Tqt ＜ Tq0 after unit operation certain time t, control
System then calculates temperature drop rate, and temperature drop rate is (Tqt-Tq0)/t.
Whether step 8 108, the temperature drop rate in judgment step 7 107 are less than or equal to system temperature drop setting value k.
In step 8 108, i.e. temperature drop rate (Tqt-Tq0)/t is compared with system temperature drop setting value k.
As (Tqt-Tq0)/t≤k, illustrate system temperature drop rate in the reasonable scope, appropriate jet, temperature drop is gentle, holds
Continuous, control system control bound aperture and auxiliary valve opening continue air injection enthalpy-increasing operation by present valve body aperture Pzt, Pft.By upper
The implementation that increasing enthalpy mouth pressure difference is established and continues increasing enthalpy is stated, as discharge superheat (Tq0-Twc0) ＞ Ps0min, control system is protected
Present valve body aperture is held to continue to run with, as discharge superheat (Tq0-Twc0) ＜ Ps0min, control system closes air injection enthalpy-increasing,
Air conditioner heat pump system realizes lasting, steady enthalpy-increasing function.
As (Tqt-Tq0)/t ＞ k, illustrate system temperature drop quickly, is more than system temperature drop setting value, under delivery temperature is quick
Drop, when delivery temperature is less than certain value, control system exits air injection enthalpy-increasing control, system exhaust temperature and then quickly on
It rises, air injection enthalpy-increasing drop exhaust is opened again after reaching certain temperature.Control system is repeatedly opened or closes air injection enthalpy-increasing, system heating
Amount follows cyclic fluctuation, influences product heating capacity and service life.
Therefore, as (Tqt-Tq0)/t ＞ k, control system then cuts down step number Δ by preset auxiliary electron expansion valve tune
Pf turns auxiliary valve opening, i.e. Pft=Pfr-X Δs Pf down (X is to adjust valve number).After auxiliary valve opening turns Δ Pf down, refrigeration system
Certain time t is run by present valve body aperture, whether then detects delivery temperature temperature drop rate in reasonable regional extent.If warm
Not in rational temperature drop range, auxiliary electron expansion valve opening continues to reduce reduction of speed rate, until temperature drop rate is in reasonable region model
It encloses or auxiliary valve opening is adjusted in the auxiliary valve opening regional value corresponding to current environmental temperature Trt until minimum opening value Pfmin.
The increasing enthalpy method detects delivery temperature fall off rate to control auxiliary electron expansion valve opening by control system
It adjusts, when delivery temperature, which reduces rate, is less than or equal to default value, main electric expansion valve and auxiliary electron expansion valve are protected
Hold current aperture；When delivery temperature, which reduces rate, is more than default value, auxiliary electron expansion valve opening gradually turns down, until
Until delivery temperature reduction of speed is in setting range.
Above-mentioned steady increasing enthalpy method has the following advantages that：
(1) wide area enthalpy-increasing function is realized, by the design of the increasing enthalpy technology, refrigeration system can be sprayed under bad working environments
Gas increasing enthalpy.(2) low exhaust temperature function is realized, delivery temperature is not by the control of discharge superheat, under 60 DEG C of leaving water temperature
Higher than 85 DEG C.(3) it realizes high energy efficiency function, by air injection enthalpy-increasing, primary flow path refrigerant degree of supercooling is improved, to improve air-conditioning heat pump
The heating capacity and Energy Efficiency Ratio of unit.(4) extend product service life, reduced and be vented by air injection enthalpy-increasing, can extend compressor is
To the service life of entire refrigeration system spare and accessory parts.(5) increasing enthalpy stability is improved：It is controlled by controlling the increasing enthalpy amount of refrigeration system
Delivery temperature temperature drop rate processed realizes lasting, steady enthalpy-increasing function.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (8)
1. a kind of steady increasing enthalpy method, which is characterized in that including：
Step 1 obtains delivery temperature and leaving water temperature in unit running process, and according to the delivery temperature and goes out water temperature
Degree obtains discharge superheat；
Step 2, judges whether the discharge superheat is more than discharge superheat setting value；
Step 3, when the discharge superheat is more than the discharge superheat setting value, acquisition current environmental temperature, and according to
Main valve aperture and auxiliary valve opening are adjusted to valve body and set aperture by the current environmental temperature；
Step 4, unit after a certain period of time, detect current exhaust gas temperature by the operation of valve body setting aperture；
Step 5, judges whether the current exhaust gas temperature is more than or equal to the delivery temperature；
Step 6, when the current exhaust gas temperature be greater than or equal to the delivery temperature when, gradually turn down the main valve aperture or
Increase the auxiliary valve opening until meeting current exhaust gas temperature less than delivery temperature or the main valve aperture and the auxiliary valve opening
It reaches the limit values.
2. steady increasing enthalpy method according to claim 1, which is characterized in that further include step 7, when the current exhaust
When temperature is less than the delivery temperature, temperature drop rate is calculated.
3. steady increasing enthalpy method according to claim 2, which is characterized in that in the step 7, the temperature drop rate
For the ratio of the difference and run time of both the current exhaust gas temperature and the delivery temperature.
4. steady increasing enthalpy method according to claim 2, which is characterized in that further include step 8, judge the temperature drop speed
Whether rate is less than or equal to system temperature drop setting value, if so, unit is run by present valve body aperture.
5. steady increasing enthalpy method according to claim 4, which is characterized in that the step 8 further includes, if the temperature drop
Rate is more than the system temperature drop setting value, gradually turns the auxiliary valve opening down until the temperature drop rate meets the system temperature
Drop setting value or the auxiliary valve opening reach the limit values.
6. steady increasing enthalpy method according to any one of claim 1 to 5, which is characterized in that the step 1 is specifically wrapped
It includes：The delivery temperature and leaving water temperature in unit running process are obtained, is calculated between the delivery temperature and leaving water temperature
Temperature gap, the temperature gap be the discharge superheat.
7. steady increasing enthalpy method according to claim 6, which is characterized in that the step is a kind of, is passed by delivery temperature
Sensor and leaving water temperature sensors obtain delivery temperature and leaving water temperature in unit running process.
8. steady increasing enthalpy method according to any one of claim 1 to 5, which is characterized in that in step 6, the master
Valve opening is successively decreased according to equal difference functions, and the auxiliary valve opening is according to equal difference increases.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109237748A (en) * | 2018-09-28 | 2019-01-18 | 宁波奥克斯电气股份有限公司 | A kind of hydrojet control method, device and air conditioner |
| CN109556210A (en) * | 2018-10-16 | 2019-04-02 | 宁波市海智普智能科技有限公司 | A kind of low form trigeneration heat pump system and its control method |
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| CN109237748A (en) * | 2018-09-28 | 2019-01-18 | 宁波奥克斯电气股份有限公司 | A kind of hydrojet control method, device and air conditioner |
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| CN109556210A (en) * | 2018-10-16 | 2019-04-02 | 宁波市海智普智能科技有限公司 | A kind of low form trigeneration heat pump system and its control method |
| WO2020155871A1 (en) * | 2019-01-30 | 2020-08-06 | 广东芬尼能源技术有限公司 | Heat pump unit, and discharge temperature control method and device therefor |
| CN110195925A (en) * | 2019-05-31 | 2019-09-03 | 宁波奥克斯电气股份有限公司 | A kind of control method and air conditioner of low-temperature air source heat pump spray enthalpy valve |
| CN110285535A (en) * | 2019-06-24 | 2019-09-27 | 珠海格力电器股份有限公司 | The increasing enthalpy control method and device of air-conditioning system |
| CN110285535B (en) * | 2019-06-24 | 2020-11-17 | 珠海格力电器股份有限公司 | Enthalpy increasing control method and device for air conditioning system |
| CN111059681A (en) * | 2019-11-20 | 2020-04-24 | 珠海格力电器股份有限公司 | Compressor air-supplementing enthalpy-increasing system with enthalpy-increasing function and control method |
| CN113432336A (en) * | 2021-04-26 | 2021-09-24 | 深圳市深蓝电子股份有限公司 | Enhanced vapor injection air source heat pump system and dynamic exhaust superheat degree control method |
| CN113669934A (en) * | 2021-07-12 | 2021-11-19 | 浙江中广电器股份有限公司 | Flash tank system and serial double-throttling control method thereof |
| CN113669934B (en) * | 2021-07-12 | 2022-11-04 | 浙江中广电器集团股份有限公司 | Flash tank system and serial double-throttling control method thereof |
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