CN110160293B - Control method for EEV electronic expansion valve of low-temperature heating machine - Google Patents
Control method for EEV electronic expansion valve of low-temperature heating machine Download PDFInfo
- Publication number
- CN110160293B CN110160293B CN201810118935.8A CN201810118935A CN110160293B CN 110160293 B CN110160293 B CN 110160293B CN 201810118935 A CN201810118935 A CN 201810118935A CN 110160293 B CN110160293 B CN 110160293B
- Authority
- CN
- China
- Prior art keywords
- eev
- temperature
- steps
- environmental temperature
- equal
- 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
Images
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
- 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
- F25B2600/2513—Expansion valves
Abstract
The invention discloses a control method for an EEV electronic expansion valve of a low-temperature heating machine, and relates to the technical field of low-temperature heating air conditioning units. The invention is different from the method that the low-temperature heating unit adopts the temperature superheat degree to control the electronic expansion valve throttling (EEV) for throttling, but according to different refrigerant systems, the opening degree is regulated by the three conditions of the ambient temperature, the exhaust pressure of the compressor and the suction pressure in a sectional control mode (the parameters can be regulated according to the actual test condition of the unit), the system is in a vacuum state, the pressure value is stable, the real operation condition of the system can be directly reflected, the detection point is not influenced by the temperature and the production process, and the stable operation of the air conditioning system is ensured. The control method of the EEV electronic expansion valve of the low-temperature heating machine can accurately control the electronic expansion valve, ensure the stability of system operation, improve the product quality and simultaneously ensure the use of consumers with peace and worry saving.
Description
Technical Field
The invention belongs to the field of automatic control, and particularly relates to a control method for an EEV electronic expansion valve of a low-temperature heating machine.
Background
With the requirement of the government of China on environmental protection, the requirement of changing coal into electricity is met in the northern area of China, the low-environment-temperature air energy water heater is used as heating equipment and is required to normally operate at the ambient temperature of-25-45 ℃, so that high technical requirements are provided for system throttling control, the system is ensured to operate stably, and the throttling method of the air conditioner product at present comprises the following three steps:
1. capillary throttling, the method can only be used on a small household air conditioner set, but cannot be automatically adjusted, and the use range of air conditioner operation is restrained;
2. the thermostatic expansion valve can be used for throttling, but the method has the advantages of limited regulation range, easy influence of environmental temperature, large fluctuation, too coarse regulation and high cost, although the method can be automatically regulated;
3. the electronic expansion valve throttling (EEV) can be automatically adjusted, and the adjusting range is wide, so that the method becomes a preferred throttling method of the low-temperature heating machine.
However, the existing low-temperature heating unit adopts the temperature superheat degree control electronic expansion valve throttling (EEV) method for throttling, and the following problems exist:
1. the temperature detected by the point-taking temperature sensor is influenced by the ambient temperature;
2. fixing the welding process requirement of the temperature sensor, ensuring good contact, otherwise, having large detection temperature deviation;
3. the refrigerant is mixed in a gas-liquid state in the system, so that the temperature sensor is unstable and inaccurate in detecting a temperature taking point;
4. the temperature sensor has large detection temperature error.
Due to the reasons, the low-temperature heating machine often has protection faults and cannot operate, the superheat control temperature taking points are too many, the control logic is too complex and too large, the requirement on a storage CPU is high, and the cost is high.
Disclosure of Invention
The present invention is to solve the above problems, and the object is achieved by: a control method of an EEV electronic expansion valve of a low-temperature heating machine is characterized in that the opening degree is controlled and regulated in a refrigerating mode or a heating mode in a segmented mode according to three conditions of ambient temperature, exhaust pressure and suction pressure of a compressor; the environment temperature conditions are all conditions for determining the total steps of the initial opening of the EEV in the heating mode and the cooling mode; after the total number of steps of the initial opening of the EEV is determined according to the ambient temperature condition, the exhaust pressure is increased, and when the total number of steps of the initial opening of the EEV is increased to a value within a range corresponding to the initial opening, the EEV performs pressure difference adjustment according to the exhaust pressure; the adjusting parameter of the pressure difference is determined according to the exhaust pressure; there are five conditions for determining the total number of steps of the initial opening of the EEV in the cooling mode, and eight conditions for determining the total number of steps of the initial opening of the EEV in the heating mode.
Preferably, the five conditions for determining the total number of steps of the initial opening of the EEV in the cooling mode are respectively as follows: the environmental temperature is more than 40 ℃, the environmental temperature is more than 35 ℃ at 40 ℃, the environmental temperature is more than 30 ℃ at 35 ℃, the environmental temperature is more than 25 ℃ at 30 ℃, and the environmental temperature is less than 25 ℃.
Preferably, the eight conditions for determining the total number of steps of the initial opening of the EEV in the heating mode are respectively: the environmental temperature is more than 15 ℃, the environmental temperature is more than or equal to 10 ℃, the environmental temperature is more than or equal to 5 ℃, the environmental temperature is more than or equal to 0 ℃, the environmental temperature is more than or equal to 5 ℃, the environmental temperature is more than or equal to.
The invention has the following beneficial effects:
(1) the electronic expansion valve throttling (EEV) accurate control ensures the stability of the system operation.
(2) Different refrigerant systems only need to be controlled and adjusted in an opening degree in a segmented mode according to three conditions of ambient temperature, compressor exhaust pressure and suction pressure (parameters can be adjusted according to the actual test condition of a unit), because the system is in a vacuum state, the pressure value is stable, the real operation condition of the system can be directly reflected, and a detection point is not influenced by temperature and a production process.
(3) By the pressure control method, only three conditions of ambient temperature, compressor exhaust pressure and suction pressure are needed, so that the problem of the existing temperature superheat degree control is effectively solved, and the stable operation of an air conditioning system is ensured.
Drawings
The invention is further described with reference to the following figures and specific examples.
The first graph is a comparison graph of the present invention and the prior superheat control.
Fig. two is a schematic diagram of a conventional superheat degree control.
Fig. three is a schematic diagram of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Referring to the first embodiment, the opening degree of the invention is controlled and adjusted in a cooling mode or a heating mode in a segmented manner according to three conditions, namely the ambient temperature, the discharge pressure and the suction pressure of a compressor; the environment temperature conditions are all conditions for determining the total steps of the initial opening of the EEV in the heating mode and the cooling mode; after the total number of steps of the initial opening of the EEV is determined according to the ambient temperature condition, the exhaust pressure is increased, and when the total number of steps of the initial opening of the EEV is increased to a value within a range corresponding to the initial opening, the EEV performs pressure difference adjustment according to the exhaust pressure; the adjusting parameter of the pressure difference is determined according to the exhaust pressure; there are five conditions for determining the total number of steps of the initial opening of the EEV in the cooling mode, and eight conditions for determining the total number of steps of the initial opening of the EEV in the heating mode.
Wherein, the five conditions for determining the total steps of the initial opening of the EEV in the refrigeration mode are respectively as follows: the environmental temperature is more than 40 ℃, the environmental temperature is more than 35 ℃ at 40 ℃, the environmental temperature is more than 30 ℃ at 35 ℃, the environmental temperature is more than 25 ℃ at 30 ℃, and the environmental temperature is less than 25 ℃.
Wherein, the eight conditions for determining the total steps of the initial opening of the EEV in the heating mode are respectively as follows: the environmental temperature is more than 15 ℃, the environmental temperature is more than or equal to 10 ℃, the environmental temperature is more than or equal to 5 ℃, the environmental temperature is more than or equal to 0 ℃, the environmental temperature is more than or equal to 5 ℃, the environmental temperature is more than or equal to.
This embodiment is described in two cases.
The first case, in the cooling mode:
the control logic is as follows:
1. when the environmental temperature T1 is more than 40 ℃, the initial opening of the EEV is 80% of the total steps, when the exhaust pressure H1 is more than 2.5MPa, the EEV is adjusted according to the pressure P1 which is 2.0MPa, the maximum steps are 100%, and the minimum opening steps are 40% of the total steps;
2. when the environmental temperature is more than or equal to 40 ℃ and more than or equal to T2 and more than 35 ℃, the initial opening of the EEV is 70 percent of the total step number, when the exhaust pressure is more than or equal to 2.5MPa and more than or equal to H2 and more than 2.0MPa, the EEV is adjusted according to the pressure P2 which is 1.8MPa, the maximum step number is 100 percent, and the minimum opening step number is 35 percent of the total step number;
3. when the environmental temperature is more than or equal to 35 ℃ and more than or equal to T3 and more than 30 ℃, the initial opening of the EEV is 60 percent of the total step number, when the exhaust pressure is more than or equal to 2.0MPa and more than or equal to H3 and more than 1.6MPa, the EEV is adjusted according to the pressure P3 and 1.6MPa, the maximum step number is 100 percent, and the minimum opening step number is 30 percent of the total step number;
4. when the environmental temperature is more than or equal to 30 ℃ and more than or equal to 25 ℃ and T4, the initial opening of the EEV is 50% of the total steps, when the exhaust pressure is more than or equal to 1.6MPa and more than or equal to 1.3MPa and H4, the EEV is adjusted according to the condition that P4 is 1.3MPa, the maximum steps are 100%, and the minimum opening steps are 25% of the total steps;
5. when the environmental temperature T5 is less than 25 ℃, the initial opening of the EEV is 40% of the total steps, when the exhaust pressure H5 is less than 1.3MPa, the EEV is adjusted according to the condition that the P5 is 1.0MPa, the maximum steps are 100%, and the minimum opening steps are 20% of the total steps.
The second condition is that in the heating mode:
the control logic is as follows:
1. when the environmental temperature T1 is more than 15 ℃, the initial opening of the EEV is 60 percent of the total steps, when the exhaust pressure H1 is more than 2.5MPa, the EEV is adjusted according to the pressure P1 which is 2.0MPa, the maximum steps are 100 percent, and the minimum opening steps are 30 percent of the total steps;
2. when the environmental temperature is more than or equal to 15 ℃ and more than or equal to T2 and more than 10 ℃, the initial opening of the EEV is 50 percent of the total steps, when the exhaust pressure is more than or equal to 2.5MPa and more than or equal to H2 and more than 2.3MPa, the EEV is adjusted according to the pressure P2 which is 1.8MPa, the maximum steps are 100 percent, and the minimum opening steps are 25 percent of the total steps;
3. when the environmental temperature is more than or equal to 10 ℃ and more than or equal to T3 and more than 5 ℃, the initial opening of the EEV is 40 percent of the total step number, when the exhaust pressure is more than or equal to 2.2MPa and more than or equal to H3 and more than 2.0MPa, the EEV is adjusted according to the pressure P3 which is 1.6MPa, the maximum step number is 100 percent, and the minimum opening step number is 20 percent of the total step number;
4. when the environmental temperature is more than or equal to 5 ℃ and more than or equal to T4 and more than 0 ℃, the initial opening of the EEV is 35 percent of the total steps, when the exhaust pressure is more than or equal to 2.0MPa and more than or equal to H4 and more than 1.8MPa, the EEV is adjusted according to the pressure P4 and is 1.4MPa, the maximum steps are 100 percent, and the minimum opening steps are 18 percent of the total steps;
5. when the environmental temperature is more than or equal to 0 ℃ and more than or equal to T5 > -5 ℃, the initial opening of the EEV is 30% of the total step number, when the exhaust pressure is more than or equal to 1.8MPa and more than or equal to H2 > 1.6MPa, the EEV is adjusted according to the pressure P5 which is 1.3MPa, the maximum step number is 100%, and the minimum opening step number is 16% of the total step number;
6. when the environmental temperature is more than or equal to T6 & gt-10 ℃ at-5 ℃, the initial opening of the EEV is 28% of the total steps, when the exhaust pressure is more than or equal to H3 & gt 1.4MPa at 1.6MPa, the EEV is adjusted according to the pressure P5 & gt 1.2MPa, the maximum steps are 100%, and the minimum opening steps are 14% of the total steps;
7. when the environmental temperature is-10 ℃ or more and T7 > -15 ℃, the initial opening of the EEV is 25% of the total steps, when the exhaust pressure is 1.4MPa or more and H4 or more and 1.2MPa or more, the EEV is adjusted according to the pressure P5-1.1 MPa, the maximum steps are 100%, and the minimum opening steps are 12% of the total steps;
8. when the environmental temperature T8 is less than-15 ℃, the initial opening of the EEV is 20% of the total steps, when the exhaust pressure H5 is less than 1.2MPa, the EEV is adjusted according to the condition that the P5 is 1.0MPa, the maximum steps are 100%, and the minimum opening steps are 10% of the total steps.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the method for adjusting the opening degree by controlling the three conditions of the ambient temperature, the discharge pressure of the compressor and the suction pressure in a stepwise manner (the parameters can be adjusted according to the actual testing conditions of the unit) according to different refrigerant systems is described in the specification of the above embodiments only to illustrate the principle of the present invention, and the present invention may have various changes and modifications without departing from the spirit and scope of the present invention, and the changes and modifications fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A control method of an EEV electronic expansion valve of a low-temperature heating machine is characterized in that the opening degree is controlled and regulated in a refrigerating mode or a heating mode in a segmented mode according to three conditions of ambient temperature, exhaust pressure and suction pressure of a compressor; the environment temperature conditions are all conditions for determining the total steps of the initial opening of the EEV in the heating mode and the cooling mode; after the total number of steps of the initial opening of the EEV is determined according to the ambient temperature condition, the exhaust pressure is increased, and when the total number of steps of the initial opening of the EEV is increased to a value within a range corresponding to the initial opening, the EEV performs pressure difference adjustment according to the exhaust pressure; the adjusting parameter of the pressure difference is determined according to the exhaust pressure; there are five conditions for determining the total number of steps of the initial opening of the EEV in the cooling mode, and eight conditions for determining the total number of steps of the initial opening of the EEV in the heating mode.
2. The method as claimed in claim 1, wherein the five conditions for determining the total number of steps of the initial opening of the EEV in the cooling mode are: the environmental temperature is more than 40 ℃, the environmental temperature is more than 35 ℃ at 40 ℃, the environmental temperature is more than 30 ℃ at 35 ℃, the environmental temperature is more than 25 ℃ at 30 ℃, and the environmental temperature is less than 25 ℃.
3. The method as claimed in claim 1, wherein the eight conditions for determining the total number of steps of the initial opening of the EEV in the heating mode are respectively: the environmental temperature is more than 15 ℃, the environmental temperature is more than or equal to 10 ℃, the environmental temperature is more than or equal to 5 ℃, the environmental temperature is more than or equal to 0 ℃, the environmental temperature is more than or equal to 5 ℃, the environmental temperature is more than or equal to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810118935.8A CN110160293B (en) | 2018-02-06 | 2018-02-06 | Control method for EEV electronic expansion valve of low-temperature heating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810118935.8A CN110160293B (en) | 2018-02-06 | 2018-02-06 | Control method for EEV electronic expansion valve of low-temperature heating machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110160293A CN110160293A (en) | 2019-08-23 |
| CN110160293B true CN110160293B (en) | 2021-02-09 |
Family
ID=67641471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810118935.8A Active CN110160293B (en) | 2018-02-06 | 2018-02-06 | Control method for EEV electronic expansion valve of low-temperature heating machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110160293B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07133969A (en) * | 1993-11-09 | 1995-05-23 | Mitsubishi Heavy Ind Ltd | Air conditioner |
| CN106196782A (en) * | 2015-04-30 | 2016-12-07 | 青岛海尔空调电子有限公司 | Source pump and control method thereof |
| CN106288567A (en) * | 2015-05-29 | 2017-01-04 | 青岛海尔空调电子有限公司 | Central air-conditioning starts control method |
| CN106556099A (en) * | 2015-09-25 | 2017-04-05 | 约克广州空调冷冻设备有限公司 | The control method of the electric expansion valve of the indoor set of multi-online air-conditioning system |
| CN107084501A (en) * | 2017-05-19 | 2017-08-22 | 广东志高暖通设备股份有限公司 | A kind of control method of air injection enthalpy-increasing air-conditioning system |
-
2018
- 2018-02-06 CN CN201810118935.8A patent/CN110160293B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07133969A (en) * | 1993-11-09 | 1995-05-23 | Mitsubishi Heavy Ind Ltd | Air conditioner |
| CN106196782A (en) * | 2015-04-30 | 2016-12-07 | 青岛海尔空调电子有限公司 | Source pump and control method thereof |
| CN106288567A (en) * | 2015-05-29 | 2017-01-04 | 青岛海尔空调电子有限公司 | Central air-conditioning starts control method |
| CN106556099A (en) * | 2015-09-25 | 2017-04-05 | 约克广州空调冷冻设备有限公司 | The control method of the electric expansion valve of the indoor set of multi-online air-conditioning system |
| CN107084501A (en) * | 2017-05-19 | 2017-08-22 | 广东志高暖通设备股份有限公司 | A kind of control method of air injection enthalpy-increasing air-conditioning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110160293A (en) | 2019-08-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107606830B (en) | Electronic expansion valve adjusting method | |
| CN103277876B (en) | The control method of the electric expansion valve in air-conditioning system | |
| CN103884140B (en) | The control method of the refrigeration compressor ventilating degree of superheat and system | |
| CN105509242A (en) | Refrigerant addition control method for air conditioner | |
| CN105276883A (en) | Control method and control device of electronic expansion valve and air conditioning system | |
| US11137157B2 (en) | Method for controlling multi-split air conditioner, multi-split air conditioner system, and computer-readable storage medium | |
| CN110671777B (en) | Control method and device of air conditioner and air conditioner | |
| CN107477933B (en) | Control method and system of multi-connected air conditioner and computer readable storage medium | |
| CN107990609B (en) | Control method of electronic expansion valve and refrigerant circulating system | |
| EP2375188A1 (en) | Air conditioner | |
| US20200041152A1 (en) | Control method of multi-split air conditioner, system, and computer readable storage medium | |
| CN107284193B (en) | Air conditioning system, and control system and control method thereof | |
| US11193704B2 (en) | Heat pump reversing valve control based on the valve reversing pressure and the system pressure | |
| CN103925668A (en) | Direct-current frequency conversion constant-temperature and humidity set achieving condensation heat recovery and heat and humidity separation control method | |
| CN111520875B (en) | Control method and system for multi-split air conditioner | |
| CN104833022A (en) | Method for controlling low cooling water inlet temperature starting of air conditioning unit | |
| CN102620458A (en) | Refrigeration cycle apparatus | |
| CN112665112B (en) | Air conditioner, control method thereof and readable storage medium | |
| CN111623569A (en) | Temperature control device and method of temperature control equipment | |
| EP4242555A1 (en) | Control method and control device for electronic expansion valve of an air source heat pump system | |
| CN107477934B (en) | Control method and system of multi-connected air conditioner and computer readable storage medium | |
| WO2021042666A1 (en) | Air conditioner intermediate capability control method, air conditioner and memory | |
| CN110160293B (en) | Control method for EEV electronic expansion valve of low-temperature heating machine | |
| CN106225171B (en) | Fan control method for shutdown of air conditioner and air conditioner | |
| CN108050719B (en) | Natural cooling system for calculating capacity of refrigerant pump based on temperature difference and control method thereof |
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 |