CN109114852B - adjusting method of electronic expansion valve and equipment adopting method - Google Patents
adjusting method of electronic expansion valve and equipment adopting method Download PDFInfo
- Publication number
- CN109114852B CN109114852B CN201810893119.4A CN201810893119A CN109114852B CN 109114852 B CN109114852 B CN 109114852B CN 201810893119 A CN201810893119 A CN 201810893119A CN 109114852 B CN109114852 B CN 109114852B
- Authority
- CN
- China
- Prior art keywords
- expansion valve
- electronic expansion
- adjusting
- suction superheat
- suction
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003507 refrigerant Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000009825 accumulation Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 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 an adjusting method of an electronic expansion valve and equipment adopting the method, wherein the adjusting method of the electronic expansion valve specifically comprises the following steps: step 1, adjusting an electronic expansion valve according to the running state of equipment; step 2, judging whether the current exhaust temperature is greater than or equal to a set value and the suction superheat degree is less than a target value; if yes, improving the suction superheat degree of the equipment to a certain degree, and continuing the next step; if not, directly continuing the next step; and step 3, returning to the step 1 to continuously adjust the electronic expansion valve. The invention can make the electronic expansion valve in a stable state in a specific state, prolong the service life of the electronic expansion valve and enhance the stability of the system.
Description
Technical Field
The invention relates to an adjusting method of an electronic expansion valve and equipment such as an air conditioning unit, a heat pump water heater and the like which adjust the electronic expansion valve by adopting the method.
background
the electronic expansion valve is a common component in equipment such as an air conditioner, a heat pump water heater and the like, and the equipment needs to be controlled and adjusted according to exhaust temperature, suction pressure, suction superheat degree and the like. For example, the heat pump water heater unit adjusts the opening or closing of an electronic expansion valve in unit equipment by controlling the suction superheat degree of a compressor, so that the equipment can normally run, liquid accumulation is prevented, and the reliability of the compressor is ensured. When no high or low pressure sensor is provided, the suction superheat is typically defined as the difference in temperature between the outlet (suction) and inlet of the unit.
However, when the unit is in a low-ring-temperature state and the exhaust temperature is too high, the unit may open the opening degree of the electronic expansion valve, but the suction superheat degree may become too low, and then the unit may close the opening degree of the electronic expansion valve, and repeating the steps may cause the suction superheat degree and the exhaust temperature to be in an unbalanced state, so that the electronic expansion valve is also in a dynamic adjustment state all the time, which may affect the service life of the electronic expansion valve, may also cause the system to operate unstably, and may cause a liquid accumulation in the compressor in a severe case, thereby reducing the reliability of the unit.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides an adjusting method of an electronic expansion valve, including:
Step 1, adjusting an electronic expansion valve according to the running state of equipment;
Step 2, judging whether the current exhaust temperature is greater than or equal to a set value and the suction superheat degree is less than a target value; if yes, improving the suction superheat degree of the equipment to a certain degree, and continuing the next step; if not, directly continuing the next step;
And step 3, returning to the step 1 to continuously adjust the electronic expansion valve.
In the technical scheme, the suction superheat degree of the equipment is improved by heating any refrigerant between the outlet of the evaporator and the inlet of the compressor. Specifically, an electric heating belt may be disposed at a corresponding position to heat any one of the refrigerants.
In one embodiment, the suction superheat of the device is increased by heating the refrigerant at the gas-liquid separator. In another embodiment, the superheat of the suction air of the device is increased by heating the refrigerant at the evaporator outlet.
Further, in the step 2, the suction superheat of the device is increased until the electronic expansion valve is opened to the maximum opening degree, and then the increase of the suction superheat of the device is stopped.
In the step 1, the electronic expansion valve is adjusted according to one or the combination of the gear size of a fan, the suction superheat degree, the exhaust temperature and the suction pressure of the equipment.
The invention also provides equipment for adjusting the electronic expansion valve by adopting the adjusting method in the technical scheme, and the equipment comprises an air conditioner, a heat pump water heater and the like.
The invention detects whether the electronic expansion valve of the unit is in a dynamic adjusting state by setting conditions, and adopts a method for improving the suction superheat degree, so that the electronic expansion valve is kept stable, the reliability and the stability of the unit are enhanced, and the service life of the electronic expansion valve can be prolonged.
Drawings
the invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is a system diagram of an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the method for adjusting an electronic expansion valve of the present invention is mainly used to solve the problem that the electronic expansion valve is always in a dynamic adjustment state during the normal control of the electronic expansion valve, which results in unstable operation of the system.
When the device normally controls the electronic expansion valve, the opening degree of the electronic expansion valve may be adjusted according to the gear size of a fan of the unit, the suction superheat degree, the exhaust temperature, the suction pressure and the like, and the opening degree of the electronic expansion valve may also be adjusted by comprehensively considering the combination of several factors.
When the exhaust temperature of the unit is greater than or equal to a set value and the suction superheat degree is smaller than a preset target value, the opening of the electronic expansion valve is frequently adjusted by the system, and the method for improving the suction superheat degree of the equipment to a certain degree is adopted, so that the electronic expansion valve is stable, and the reliability and the stability of the unit are enhanced.
The invention improves the suction superheat degree of the equipment by heating any refrigerant between the outlet of the evaporator and the inlet of the compressor. Specifically, an electric heating belt may be disposed at a corresponding position to heat any one of the refrigerants. For example, in the embodiment shown in fig. 2, the unit includes a compressor 1, an evaporator 2, a condenser 3, and a gas-liquid separator 4, an electric heating belt 5 is disposed at the gas-liquid separator 4 to heat a refrigerant at the gas-liquid separator 4 to increase the degree of superheat of suction gas, and the adjustment capability of the electronic expansion valve 6 is compensated by additionally increasing the degree of superheat of suction gas, so as to improve the reliability and stability of the unit. For another example, in other embodiments, the degree of superheat of the suction gas of the device may also be increased by heating the refrigerant at the outlet of the evaporator 2.
When the electronic expansion valve is opened to the maximum opening (for example 480B), judging that the suction superheat degree does not need to be increased at the moment, closing the electric heating belt, stopping increasing the suction superheat degree, and adjusting the electronic expansion valve according to a normal mode.
the equipment adopting the method for adjusting the electronic expansion valve can specifically comprise an air conditioner, a heat pump water heater and the like, and the equipment adopting the method also belongs to the protection scope of the invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A method of adjusting an electronic expansion valve, comprising:
Step 1, adjusting an electronic expansion valve according to the running state of equipment;
Step 2, judging whether the current exhaust temperature is greater than or equal to a set value and the suction superheat degree is less than a target value; if yes, any refrigerant between the outlet of the evaporator and the inlet of the compressor is heated to improve the suction superheat degree of the equipment to a certain degree so as to stabilize the electronic expansion valve, and the next step is continued; if not, directly continuing the next step;
and step 3, returning to the step 1 to continuously adjust the electronic expansion valve.
2. The method as claimed in claim 1, wherein the suction superheat of the device is increased by heating any refrigerant between the evaporator outlet and the compressor inlet.
3. The method for adjusting an electronic expansion valve according to claim 2, wherein an electric heating band is provided at a corresponding position to heat any one of the refrigerants.
4. The method of adjusting an electronic expansion valve of claim 2, wherein the degree of superheat of the suction gas of the device is increased by heating the refrigerant at the gas-liquid separator.
5. a method of regulating an electronic expansion valve as claimed in claim 2, wherein the suction superheat of the device is increased by heating the refrigerant at the evaporator outlet.
6. The method for adjusting an electronic expansion valve according to claim 1, wherein in the step 2, the increase of the suction superheat of the device is stopped after the electronic expansion valve is opened to the maximum opening degree.
7. The method for adjusting an electronic expansion valve according to claim 1, wherein in step 1, the electronic expansion valve is adjusted according to one or a combination of a fan gear size, a suction superheat size, a discharge temperature size and a suction pressure size of the device.
8. Device for adjusting an electronic expansion valve by an adjustment method according to any of claims 1-7.
9. The apparatus of claim 8, comprising an air conditioner, a heat pump water heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810893119.4A CN109114852B (en) | 2018-08-07 | 2018-08-07 | adjusting method of electronic expansion valve and equipment adopting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810893119.4A CN109114852B (en) | 2018-08-07 | 2018-08-07 | adjusting method of electronic expansion valve and equipment adopting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109114852A CN109114852A (en) | 2019-01-01 |
| CN109114852B true CN109114852B (en) | 2019-12-17 |
Family
ID=64852864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810893119.4A Active CN109114852B (en) | 2018-08-07 | 2018-08-07 | adjusting method of electronic expansion valve and equipment adopting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109114852B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666561B (en) * | 2006-03-27 | 2012-11-28 | 三菱电机株式会社 | Refrigerating and air-conditioning plant |
| CN101307974B (en) * | 2008-07-09 | 2010-06-23 | 上海理工大学 | Steam compression refrigerating cycle dry-type evaporator exit status measurement method and device |
| CN103245151B (en) * | 2013-04-28 | 2015-02-25 | 南京师范大学 | Frost-less air-source heat pump hot water unit and proportional-integral-differential control method for same |
| CN203629167U (en) * | 2013-06-13 | 2014-06-04 | 广东美的暖通设备有限公司 | Gas-liquid separation device and air conditioner |
| CN105466095B (en) * | 2016-01-25 | 2018-04-20 | 珠海格力电器股份有限公司 | Electric heating control method, device and system for low-temperature refrigeration air conditioning unit |
| CN106595157A (en) * | 2016-12-14 | 2017-04-26 | 重庆美的通用制冷设备有限公司 | Control method and device for opening degree of electronic expansion valve |
-
2018
- 2018-08-07 CN CN201810893119.4A patent/CN109114852B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109114852A (en) | 2019-01-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111692736B (en) | Control method of electronic expansion valve and air conditioning system | |
| WO2020062598A1 (en) | Operation control method and apparatus for water multi-split unit, and medium and water multi-split air-conditioning system | |
| CN105627524B (en) | Air conditioner anti-freeze control method and air conditioner | |
| WO2019153887A1 (en) | Control method and device for air conditioning system and air conditioning system | |
| CN109945435B (en) | Multi-online indoor unit shutdown control method and multi-online unit | |
| WO2017026310A1 (en) | Air conditioner and method of operating same | |
| CN109425069B (en) | Control method for electronic expansion valve during heating | |
| CN109405379B (en) | Control method for refrigeration electronic expansion valve | |
| CN105042763B (en) | The control method of the centrifugal Central air-conditioning unit normal operation of frequency conversion magnetic levitation | |
| CN112393482B (en) | Variable-frequency air-cooled water chilling unit and variable-working-condition starting control method thereof | |
| WO2021063088A1 (en) | Cooling system and method for inverter, and air conditioning apparatus | |
| CN109282516B (en) | Air-cooled screw unit and control method thereof | |
| US10254025B2 (en) | Refrigerating system and method for controlling the same | |
| CN110057050B (en) | Control method of air conditioner in refrigeration mode | |
| CN113028590B (en) | Air conditioner low-temperature refrigeration control method and device and air conditioner | |
| CN110779146B (en) | Air conditioner and electronic expansion valve control method thereof, storage medium and computer equipment | |
| CN111520875B (en) | Control method and system for multi-split air conditioner | |
| CN111520896A (en) | Air conditioner heating external unit fan control method and air conditioner system | |
| CN112413842B (en) | Air conditioner control method and air conditioner | |
| CN109114852B (en) | adjusting method of electronic expansion valve and equipment adopting method | |
| CN110906515B (en) | Refrigeration and dehumidification switching method and system of air conditioner | |
| US10502470B2 (en) | System and method to maintain evaporator superheat during pumped refrigerant economizer operation | |
| JP6076583B2 (en) | heat pump | |
| US10443901B2 (en) | Indoor unit of air conditioner | |
| CN111397133A (en) | Control method of multi-split air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |