CN109386996A - Control method of electronic expansion valve and air conditioning system - Google Patents
Control method of electronic expansion valve and air conditioning system Download PDFInfo
- Publication number
- CN109386996A CN109386996A CN201811168912.4A CN201811168912A CN109386996A CN 109386996 A CN109386996 A CN 109386996A CN 201811168912 A CN201811168912 A CN 201811168912A CN 109386996 A CN109386996 A CN 109386996A
- Authority
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- China
- Prior art keywords
- degree
- expansion valve
- electric expansion
- supercooling
- superheat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004378 air conditioning Methods 0.000 title claims abstract description 20
- 238000012937 correction Methods 0.000 claims description 58
- 238000004781 supercooling Methods 0.000 claims description 40
- 230000008859 change Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 238000012886 linear function Methods 0.000 claims description 4
- 238000012888 cubic function Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
-
- 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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method of an electronic expansion valve and an air conditioning system, comprising the following steps: calculating the actual flow of the electronic expansion valve according to the relevant parameters; introducing a flow characteristic curve formula, and correcting the flow characteristic curve formula according to factors influencing actual flow to obtain a corresponding relation between the actual flow and the opening degree of the electronic expansion valve; and calculating the opening according to the corresponding relation, and controlling the electronic expansion valve according to the opening. The invention can realize the accurate control of the electronic expansion valve.
Description
Technical field
The present invention relates to electric expansion valves, more particularly to the electric expansion valve of the indoor unit of air-conditioning system is controlled
Method.
Background technique
Air-conditioning makees one of for people's lives important electric appliance, with gradually enriching for people 's material life, comfort
It is also increasingly taken seriously with the feature of environmental protection.The various performances of indoor unit, reliability and noise etc. are all the important leverages of comfort,
It influences all very big.Self adaptive control adjusting is belonged to using more control mode at present, by being continuously increased or reducing electricity
Sub- expansion valve opening control target superheat degree or target degree of supercooling, it is stronger that this control mode controls reliability, but it is controlled
Precision is lower, and control process is longer, and electric expansion valve action frequency is more, is unfavorable to indoor unit noise.
Summary of the invention
Control precision in order to solve electric expansion valve in the prior art is low, control process is long and action frequency more than etc. technologies
Problem proposes a kind of control method of electric expansion valve, comprising:
Actual flow required for calculating the electric expansion valve according to relevant parameter；
Traffic characteristic curve equation is introduced, and the traffic characteristic curve equation is repaired according to the factor for influencing actual flow
Just obtaining the corresponding relationship between the actual flow and the aperture of electric expansion valve；
The aperture is calculated according to the corresponding relationship, and electric expansion valve is controlled according to the aperture.
In a specific embodiment, the specific steps for calculating actual flow include:
It defines the practical degree of superheat or practical degree of supercooling subtracts the difference of target superheat degree or target degree of supercooling as the degree of superheat or supercooling
The variable quantity of degree；
Defining actual flow and subtracting the flow under target degree of supercooling or target superheat degree is changes in flow rate amount；
According to the value range of the variable quantity of the degree of superheat or degree of supercooling, different actual flow and the degree of superheat or supercooling are respectively obtained
The variable quantity of degree and the corresponding relationship of changes in flow rate amount；
According to the corresponding relationship, corresponding actual flow is calculated.
Specifically, when the variable quantity of the degree of superheat or degree of supercooling is greater than 0 DEG C, the actual flow=present flow rate+overheat
The variable quantity * changes in flow rate amount of degree or degree of supercooling.
When the variable quantity of the degree of superheat is less than 0 DEG C, the actual flow=present flow rate+2* degree of superheat variable quantity * stream
Measure variable quantity.
When the variable quantity of the degree of supercooling is less than 0 DEG C, the actual flow=present flow rate+1/2* degree of supercooling variable quantity *
Changes in flow rate amount.
The above-mentioned practical degree of superheat is entered by the indoor unit that the outlet pipe temperature of the indoor unit of air-conditioning system subtracts air-conditioning system
Tube temperature degree obtains.Above-mentioned practical degree of supercooling subtracts air conditioner indoor unit by the corresponding saturation temperature of high-pressure of air-conditioning system
Enter tube temperature degree to obtain.
Specifically, the aperture of the revised electric expansion valve and the corresponding relationship of actual flow are electric expansion valve
Aperture=(the-the second correction factor of actual flow-third correction factor) correction factor of ÷ K × first；Wherein, the first correction factor
For the pressure difference correction factor after and before the valve of electric expansion valve, the second correction factor is that the upstream pressure of electric expansion valve corrects system
Number, third correction factor are the correction factor of current degree of supercooling or the degree of superheat.First correction factor, the second correction factor,
Third correction factor is calculated by the experimental data that actual measurement electric expansion valve obtains.
Specifically, the traffic characteristic curve equation uses the traffic characteristic curve equation of linear function model, parabola
The traffic characteristic curve equation of model, the traffic characteristic curve equation of cubic function model one of are worked as.
The invention also provides it is a kind of by adopting the above technical scheme in control method electric expansion valve controlled
Air-conditioning system.
Preferably, the electric expansion valve is the electric expansion valve of the indoor unit of air-conditioning system.
Present invention introduces the discharge characteristic functions of electric expansion valve, are subject to different items by the factor to had an impact flow
Amendment under part obtains the actual flow state under the valve opening state, then according to the degree of superheat or the relevant ginseng of degree of supercooling
Actual flow is calculated in number, then goes out the electronic expansion valve opening under the flow status according to actual flow inverse, thus real
Now to the accurate control of electric expansion valve.
Detailed description of the invention
Flow chart when Fig. 1 is refrigeration mode of the present invention.
Flow chart when Fig. 2 is heating mode of the present invention.
Fig. 3 is one embodiment structure chart of air-conditioning system of the present invention.
Specific embodiment
Specific embodiments of the present invention are by taking the traffic characteristic curve of linear function as an example, and valve is with 480~2000PLS calculating
Control, in the case where pressure difference before and after certain upstream pressure, certain degree of superheat or degree of supercooling, certain valve, electric expansion valve
The relationship of aperture and target flow are as follows: target flow=K* current valve opening+B, K are discharge coefficients, and B is constant, the two values are all
It is to be determined according to electric expansion valve itself, can be provided by electric expansion valve producer, the flux experiment of valve body can also be passed through
It obtains.
When specifically calculating the corresponding relationship of actual flow and electronic expansion valve opening, need to consider it is had an impact because
Element is based on above-mentioned traffic characteristic curve equation, the aperture of revised electric expansion valve and the corresponding relationship of actual flow are as follows: real
Border flow=the+the second correction factor of K* the first correction factor * current valve aperture+third correction factor.
Wherein: the first correction factor refers to the correction factor of the valve front and back pressure difference of electric expansion valve, is to discharge characteristic song
The amendment of line slope, it is available according to measured curve: pressure difference+B1 before and after the first correction factor=K1* current valve.
Second correction factor refers to upstream pressure correction factor, and one timing of other conditions, upstream pressure is bigger, and flow is got over
Greatly, it is obtained according to measured curve: the current upstream pressure of the second correction factor=K2*.
Third correction factor refers to the correction factor of current degree of supercooling (or degree of superheat), one timing of other conditions, degree of supercooling (or
The degree of superheat) it is bigger, flow is bigger, is obtained according to measured curve: the third correction factor=current degree of supercooling of K3* (or degree of superheat).
Above first to third correction factor, and it is to flow that K1, K2, K3, B1, which are obtained according to actual experiment data,
Further amendment and accurate positioning.
Control method process under different mode to electric expansion valve is described below in detail.
As shown in Figure 1, the control method of electric expansion valve proposed by the present invention in cooling mode when, need first according to phase
Close the actual flow that parameter calculates electric expansion valve, the specific process for calculating actual flow are as follows:
Define the variable quantity=practical degree of superheat-target superheat degree=(indoor unit outlet pipe temperature-indoor unit enters tube temperature degree)-of the degree of superheat
Target superheat degree；Wherein the outlet pipe temperature of indoor unit and indoor unit enter tube temperature degree and actually detected can obtain, target superheat degree
It is preset value；
Define the flow under changes in flow rate amount=actual flow-target superheat degree；Wherein the corresponding flow of target superheat degree is also pre-
If value；
When 0 DEG C of degree of superheat variable quantity >, required actual flow=present flow rate+degree of superheat variable quantity * changes in flow rate amount.
Then current aperture demand is calculated according to the corresponding relationship between revised actual flow and aperture, when
Early gate aperture=(the-the second correction factor of actual flow-third correction factor) first correction factor of ÷ K*=(present flow rate+mistake
The-the second correction factor of variable quantity * changes in flow rate amount-third correction factor of temperature) the first correction factor of ÷ K*, it that is to say current
Electric expansion valve needs the aperture adjusted.
As 0 DEG C of degree of superheat variable quantity <, required actual flow=present flow rate+2* degree of superheat variable quantity * flow becomes
Change amount.Then current aperture demand, current valve are calculated according to the corresponding relationship between revised actual flow and aperture
Aperture=(the-the second correction factor of actual flow-third correction factor) the first correction factor of ÷ K*=(present flow rate+2* degree of superheat
The-the second correction factor of variable quantity * changes in flow rate amount-third correction factor) the first correction factor of ÷ K*, that is to say Current electronic
Expansion valve needs the aperture adjusted.
As shown in Fig. 2, in a heating mode when, also need first according to relevant parameter calculate electric expansion valve practical stream
Amount, the specific process for calculating actual flow are as follows:
Variable quantity=practical degree of supercooling-target degree of supercooling of definition degree of supercooling=(high-pressure of air-conditioning system corresponds to saturation temperature-
Indoor unit enters tube temperature degree)-target degree of supercooling.
Define the flow under changes in flow rate amount=actual flow-target degree of supercooling；
When 0 DEG C of variable quantity > of degree of supercooling, required actual flow=present flow rate+degree of supercooling variable quantity * changes in flow rate
Amount.Then current aperture demand is calculated according to the corresponding relationship between revised actual flow and aperture, current valve is opened
Degree=(the-the second correction factor of actual flow-third correction factor) the first correction factor of ÷ K*=(present flow rate+degree of supercooling change
The-the second correction factor of change amount * changes in flow rate amount-third correction factor) the first correction factor of ÷ K*, it that is to say that Current electronic expands
Valve needs the aperture adjusted；
When 0 DEG C of variable quantity < of degree of supercooling, required actual flow=present flow rate+1/2* degree of supercooling variable quantity * flow becomes
Change amount.Then current aperture demand, current valve are calculated according to the corresponding relationship between revised actual flow and aperture
Aperture=(the-the second correction factor of actual flow-third correction factor) first correction factor of ÷ K*=(present flow rate+1/2* supercooling
The-the second correction factor of variable quantity * changes in flow rate amount-third correction factor of degree) the first correction factor of ÷ K*, it that is to say current electricity
Sub- expansion valve needs the aperture adjusted.
In other embodiments, traffic characteristic curve equation is in addition to the traffic characteristic curve equation using linear function model
In addition, traffic characteristic curve equation, traffic characteristic curve equation of cubic function model of parabola model etc. can also be used
Deng
The present invention, which also protects, uses the air-conditioning system that above-mentioned control method controls electric expansion valve.As shown in figure 3, should
Air-conditioning system controls the electric expansion valve (not shown) of indoor unit using above-mentioned control method.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (12)
1. a kind of control method of electric expansion valve characterized by comprising
Actual flow required for calculating the electric expansion valve according to relevant parameter；
Traffic characteristic curve equation is introduced, and the traffic characteristic curve equation is repaired according to the factor for influencing actual flow
Just obtaining the corresponding relationship between the actual flow and the aperture of electric expansion valve；
The aperture is calculated according to the corresponding relationship, and electric expansion valve is controlled according to the aperture.
2. the control method of electric expansion valve as described in claim 1, which is characterized in that actual flow required for calculating
Specific steps include:
It defines the practical degree of superheat or practical degree of supercooling subtracts the difference of target superheat degree or target degree of supercooling as the degree of superheat or supercooling
The variable quantity of degree；
Defining actual flow and subtracting the flow under target degree of supercooling or target superheat degree is changes in flow rate amount；
According to the value range of the variable quantity of the degree of superheat or degree of supercooling, different actual flow and the degree of superheat or supercooling are respectively obtained
The variable quantity of degree and the corresponding relationship of changes in flow rate amount；
According to the corresponding relationship, corresponding actual flow is calculated.
3. the control method of electric expansion valve as claimed in claim 2, which is characterized in that the change of the degree of superheat or degree of supercooling
When change amount is greater than 0 DEG C, the variable quantity * changes in flow rate amount of the actual flow=present flow rate+degree of superheat or degree of supercooling.
4. the control method of electric expansion valve as claimed in claim 2, which is characterized in that the variable quantity of the degree of superheat is less than
At 0 DEG C, the actual flow=present flow rate+2* degree of superheat variable quantity * changes in flow rate amount.
5. the control method of electric expansion valve as claimed in claim 2, which is characterized in that the variable quantity of the degree of supercooling is less than
At 0 DEG C, the actual flow=present flow rate+1/2* degree of supercooling variable quantity * changes in flow rate amount.
6. the control method of electric expansion valve as claimed in claim 2, which is characterized in that the practical degree of superheat passes through air-conditioning
The tube temperature degree that enters that the outlet pipe temperature of the indoor unit of system subtracts the indoor unit of air-conditioning system obtains.
7. the control method of electric expansion valve as claimed in claim 2, which is characterized in that the practical degree of supercooling passes through air-conditioning
The tube temperature degree that enters that the corresponding saturation temperature of the high-pressure of system subtracts air conditioner indoor unit obtains.
8. the control method of electric expansion valve as described in claim 1, which is characterized in that the revised electric expansion valve
Aperture and actual flow corresponding relationship be electric expansion valve aperture=(the-the second correction factor of actual flow-third is corrected
Coefficient) correction factor of ÷ K × first；Wherein, the first correction factor is the pressure difference correction factor after and before the valve of electric expansion valve, the
Two correction factors are the upstream pressure correction factor of electric expansion valve, and third correction factor is repairing for current degree of supercooling or the degree of superheat
Positive coefficient.
9. the control method of electric expansion valve as claimed in claim 8, which is characterized in that first correction factor, second
Correction factor, third correction factor are calculated by the experimental data that actual measurement electric expansion valve obtains.
10. the control method of electric expansion valve as described in claim 1, which is characterized in that the traffic characteristic curve equation
Using the traffic characteristic curve equation of linear function model, traffic characteristic curve equation, the cubic function model of parabola model
Traffic characteristic curve equation one of work as.
11. the air-conditioning system controlled using control method described in above-mentioned any one claim electric expansion valve.
12. air-conditioning system as claimed in claim 11, which is characterized in that the electric expansion valve is the indoor unit of air-conditioning system
Electric expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811168912.4A CN109386996A (en) | 2018-10-08 | 2018-10-08 | Control method of electronic expansion valve and air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811168912.4A CN109386996A (en) | 2018-10-08 | 2018-10-08 | Control method of electronic expansion valve and air conditioning system |
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| Publication Number | Publication Date |
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| CN109386996A true CN109386996A (en) | 2019-02-26 |
Family
ID=65419141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811168912.4A Pending CN109386996A (en) | 2018-10-08 | 2018-10-08 | Control method of electronic expansion valve and air conditioning system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186227A (en) * | 2019-05-31 | 2019-08-30 | 广东美的制冷设备有限公司 | The control method for electronic expansion valve of air conditioner indoor unit |
| CN112303957A (en) * | 2020-10-15 | 2021-02-02 | 珠海格力电器股份有限公司 | Oil return control method for compressor |
| CN112856865A (en) * | 2021-01-28 | 2021-05-28 | 山东奇威特太阳能科技有限公司 | Refrigerant flow control method and refrigerating unit |
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