CN112283994A - Control method for preventing compressor from liquid impact - Google Patents
Control method for preventing compressor from liquid impact Download PDFInfo
- Publication number
- CN112283994A CN112283994A CN202011187392.9A CN202011187392A CN112283994A CN 112283994 A CN112283994 A CN 112283994A CN 202011187392 A CN202011187392 A CN 202011187392A CN 112283994 A CN112283994 A CN 112283994A
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- China
- Prior art keywords
- return air
- superheat degree
- current
- air superheat
- compressor
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 title claims abstract description 15
- 238000009491 slugging Methods 0.000 claims abstract 4
- 238000001816 cooling Methods 0.000 claims 1
- 238000005057 refrigeration Methods 0.000 description 5
- OIGNJSKKLXVSLS-VWUMJDOOSA-N prednisolone Chemical compound O=C1C=C[C@]2(C)[C@H]3[C@@H](O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 OIGNJSKKLXVSLS-VWUMJDOOSA-N 0.000 description 3
- 238000010257 thawing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
-
- 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
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2104—Temperatures of an indoor room or compartment
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
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- 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 for preventing a compressor from liquid impact, which comprises the steps of S1, starting the compressor, obtaining the current environment temperature, and obtaining the initial opening degree of a main expansion valve according to the current environment temperature; s2, acquiring the current return air temperature of the compressor and the current indoor coil temperature, and acquiring the current return air superheat degree according to the current return air temperature of the compressor and the current indoor coil temperature; s3, acquiring the current target return air superheat degree according to the running frequency of the compressor, and acquiring return air superheat degree deviation according to the current return air superheat degree and the current target return air superheat degree; s4, acquiring the change rate of the return air superheat degree deviation according to the current return air superheat degree deviation and the last return air superheat degree deviation; and S5, acquiring the opening change value of the main expansion valve according to the return air superheat degree deviation and the return air superheat degree deviation change rate. The invention determines the opening degree of the main expansion valve to be adjusted through the return air superheat degree deviation and the return air superheat degree deviation change rate, prevents the electronic expansion valve from being unstable in control to cause low energy efficiency and prevents the compressor from liquid slugging.
Description
Technical Field
The invention relates to an air source heat pump unit, in particular to a control method for preventing liquid impact of a compressor.
Background
The technical product of the industry has the following defects: 1. the existing products in the industry have the problems that the opening of an electronic expansion valve is too large or too small in the market, 2 serious liquid impact occurs in the starting process of a machine, 3 high-pressure protection is performed in the defrosting process, 4 the opening is unreasonable, defrosting is not clean, and 5 the electronic expansion valve is unstable in control, so that the capacity and the energy efficiency are low.
To solve this problem, the present invention is hereby proposed.
Disclosure of Invention
The invention aims to provide a control method for preventing liquid impact of a compressor, which can prevent the low energy efficiency caused by unstable control of an electronic expansion valve.
The purpose of the invention can be realized by the following technical scheme:
a control method for preventing liquid impact of a compressor comprises the following steps:
s1, starting the compressor, obtaining the current environment temperature, and obtaining the initial opening degree of the main expansion valve according to the current environment temperature;
s2, after the compressor runs for 3S on a 50hz platform, obtaining the current return air temperature of the compressor and the current indoor coil temperature, and obtaining the current return air superheat degree according to the current return air temperature of the compressor and the current indoor coil temperature;
s3, acquiring the current target return air superheat degree according to the running frequency of the compressor, and acquiring return air superheat degree deviation according to the current return air superheat degree and the current target return air superheat degree;
s4, acquiring the change rate of the return air superheat degree deviation according to the current return air superheat degree deviation and the last return air superheat degree deviation;
and S5, acquiring the opening change value of the main expansion valve according to the return air superheat degree deviation and the return air superheat degree deviation change rate.
Further, in step S1, the current ambient temperature is obtained, and the initial opening degree of the main expansion valve is obtained by looking up the main expansion valve opening degree control parameter table, which can be stored.
Further, the return air superheat degree CSH is equal to the return air temperature-the refrigeration coil temperature + CSHSLT, and the CSHSLT is the return air superheat degree correction temperature of the main expansion valve.
Further, the opening degree change value of the main expansion valve is obtained according to the return air superheat degree deviation and the return air superheat degree deviation change rate, a return air superheat degree control table corresponding to the return air superheat degree deviation delta CSH and the return air superheat degree deviation change rate delta CSH 'is manufactured, the only main expansion valve change value delta F is corresponding to the zone section of the delta CSH and the zone section of the delta CSH', and the opening degree of the main expansion valve is adjusted through the main expansion valve change value delta F.
The invention has the beneficial effects that:
the opening degree of the main adjusting expansion valve to be adjusted is determined through the return air superheat degree deviation and the return air superheat degree deviation change rate, so that the problem of low energy efficiency caused by unstable control of the electronic expansion valve can be prevented; meanwhile, the phenomenon of serious liquid impact during the starting process of the machine can be avoided.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of a control method for preventing compressor liquid impact according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, a control method for preventing a compressor from liquid impact includes the steps of: s1, starting the compressor, obtaining the current environment temperature, and obtaining the initial opening degree of the main expansion valve according to the current environment temperature;
s2, after the compressor runs for 3S on a 50hz platform, obtaining the current return air temperature of the compressor and the current indoor coil temperature, and obtaining the current return air superheat degree according to the current return air temperature of the compressor and the current indoor coil temperature;
s3, acquiring the current target return air superheat degree according to the running frequency of the compressor, and acquiring return air superheat degree deviation according to the current return air superheat degree and the current target return air superheat degree;
s4, acquiring the change rate of the return air superheat degree deviation according to the current return air superheat degree deviation and the last return air superheat degree deviation;
and S5, acquiring the opening change value of the main expansion valve according to the return air superheat degree deviation and the return air superheat degree deviation change rate.
In specific control, firstly, an environment temperature main expansion valve opening degree control parameter table is manufactured, referring to table 1, the table comprises environment temperature interval division, main expansion valve minimum opening degree, main expansion valve maximum opening degree and main expansion valve initial opening degree, in step S1, the current environment temperature is obtained, the main expansion valve initial opening degree is obtained by searching the main expansion valve opening degree control parameter table, the control parameter table can be stored, and the control method can be quickly searched when being started.
TABLE 1 ambient temperature Main expansion valve opening degree control parameter Table
Generally, the return air superheat degree is obtained by calculating the return air temperature and the indoor coil temperature, specifically, the return air superheat degree CSH is the return air temperature-the refrigeration coil temperature + CSHSLT, the CSHSLT is a main expansion valve return air superheat degree correction temperature, the main expansion valve return air superheat degree correction temperature is related to the compressor operation frequency, and is obtained by searching a table related to the compressor operation frequency, the compressor operation frequency and the refrigeration return air superheat degree correction temperature are made into a main expansion valve return air superheat degree correction temperature table, referring to table 2, the main expansion valve return air superheat degree correction temperature table includes the compressor operation frequency and the refrigeration return air superheat degree correction temperature, the compressor operation frequency exists in a block mode, and the refrigeration return air superheat degree correction temperature can be corrected by a person in the field according to experience or actual operation data.
TABLE 2 main expansion valve return air superheat correction thermometer
In step S3, the return air superheat degree deviation Δ CSH is a difference between the return air superheat degree CSH and the target return air superheat degree CSHT, that is, the return air superheat degree deviation Δ CSH is CSH-CSHT.
Preferably, the target return air superheat degree CSHT takes a value according to the target return air superheat degree initial temperature of the main expansion valve, and the CSHTSLT takes a value according to the target return air superheat degree correction temperature of the main expansion valve; namely the target return air superheat degree CSHT ═ CSHTIT + CSHTSLT.
The target CSHTSLT can be corrected by referring to a main expansion valve return air superheat correction temperature table, and the return air superheat CSH is averaged according to the main expansion valve normal regulation period MPTM of 30S.
The refrigerating return air superheat degree deviation change rate Δ CSH ═ current Δ CSH — last Δ CSH, the current Δ CSH can be obtained by the return air superheat degree deviation Δ CSH — CSH, and the last Δ CSH is the return air superheat degree deviation Δ CSH at some time before this time, for example, the values are as in table 3 below.
TABLE 3
And acquiring a main expansion valve opening degree change value according to the return air superheat degree deviation and the return air superheat degree deviation change rate, manufacturing a return air superheat degree control table corresponding to the return air superheat degree deviation delta CSH and the return air superheat degree deviation change rate delta CSH ', referring to a table 4, and adjusting the opening degree of the main expansion valve according to the main expansion valve change value delta F corresponding to the delta CSH section and the delta CSH'. In the adjustment process, referring to table 1, if the opening degree of the main expansion valve is smaller than the minimum opening degree of the main expansion valve, the minimum opening degree of the main expansion valve is taken, and if the opening degree of the main expansion valve is larger than the maximum opening degree of the main expansion valve, the maximum opening degree of the main expansion valve is taken.
TABLE 4 Return air superheat control chart
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. A control method for preventing liquid impact of a compressor is characterized by comprising the following steps: s1, starting the compressor, obtaining the current environment temperature, and obtaining the initial opening degree of the main expansion valve according to the current environment temperature;
s2, after the compressor runs for 3S on a 50hz platform, obtaining the current return air temperature of the compressor and the current indoor coil temperature, and obtaining the current return air superheat degree according to the current return air temperature of the compressor and the current indoor coil temperature;
s3, acquiring the current target return air superheat degree according to the running frequency of the compressor, and acquiring return air superheat degree deviation according to the current return air superheat degree and the current target return air superheat degree;
s4, acquiring the change rate of the return air superheat degree deviation according to the current return air superheat degree deviation and the last return air superheat degree deviation;
and S5, acquiring the opening change value of the main expansion valve according to the return air superheat degree deviation and the return air superheat degree deviation change rate.
2. The control method for preventing liquid slugging of compressor as claimed in claim 1, wherein in step S1, the current ambient temperature is obtained, and the initial opening degree of the main expansion valve is obtained by looking up the main expansion valve opening degree control parameter table, wherein the control parameter table can be stored.
3. The control method for preventing liquid slugging of compressor as claimed in claim 2, wherein the superheat degree of return air CSH is return air temperature-cooling coil temperature + CSHSLT, and said CSHSLT is the main expansion valve return air superheat degree correction temperature.
4. The control method for preventing liquid slugging of compressor as claimed in claim 2, wherein the opening degree variation of main expansion valve is obtained according to the return air superheat degree deviation and the return air superheat degree deviation variation rate, a return air superheat degree control table corresponding to the return air superheat degree deviation Δ CSH and the return air superheat degree deviation variation rate Δ CSH 'is prepared, the opening degree of main expansion valve is adjusted by the main expansion valve variation value Δ F according to the unique main expansion valve variation value Δ F corresponding to the section of Δ CSH and the section of Δ CSH'.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011187392.9A CN112283994A (en) | 2020-10-30 | 2020-10-30 | Control method for preventing compressor from liquid impact |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011187392.9A CN112283994A (en) | 2020-10-30 | 2020-10-30 | Control method for preventing compressor from liquid impact |
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| Publication Number | Publication Date |
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| CN112283994A true CN112283994A (en) | 2021-01-29 |
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| CN202011187392.9A Pending CN112283994A (en) | 2020-10-30 | 2020-10-30 | Control method for preventing compressor from liquid impact |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007860A (en) * | 2021-04-19 | 2021-06-22 | 宁波奥克斯电气股份有限公司 | Low-voltage protection control method and device and air conditioner |
| CN114136032A (en) * | 2021-11-24 | 2022-03-04 | 广东纽恩泰新能源科技发展有限公司 | Electronic expansion valve control method and device, computer equipment and storage medium |
| CN117847745A (en) * | 2024-01-22 | 2024-04-09 | 小米科技(武汉)有限公司 | Air conditioner control method and device, electronic equipment and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04295550A (en) * | 1991-03-22 | 1992-10-20 | Toshiba Corp | Refrigerating cycle apparatus |
| CN106642562A (en) * | 2016-12-13 | 2017-05-10 | 青岛海尔空调器有限总公司 | Control method and device for air conditioner expansion valve |
| CN107543283A (en) * | 2017-08-18 | 2018-01-05 | 广东美的暖通设备有限公司 | A kind of control method of air conditioner, control system and air conditioner |
| CN108344213A (en) * | 2018-02-08 | 2018-07-31 | 广东高而美制冷设备有限公司 | A kind of tune valve method of the best aperture of electric expansion valve and adjust valve gear |
| CN109506315A (en) * | 2018-11-29 | 2019-03-22 | 珠海格力电器股份有限公司 | Air conditioner and control method for preventing compressor from running with liquid |
| CN110513818A (en) * | 2019-08-29 | 2019-11-29 | Tcl空调器(中山)有限公司 | Air conditioner refrigeration or heating control method, air conditioner and storage medium |
-
2020
- 2020-10-30 CN CN202011187392.9A patent/CN112283994A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04295550A (en) * | 1991-03-22 | 1992-10-20 | Toshiba Corp | Refrigerating cycle apparatus |
| CN106642562A (en) * | 2016-12-13 | 2017-05-10 | 青岛海尔空调器有限总公司 | Control method and device for air conditioner expansion valve |
| CN107543283A (en) * | 2017-08-18 | 2018-01-05 | 广东美的暖通设备有限公司 | A kind of control method of air conditioner, control system and air conditioner |
| CN108344213A (en) * | 2018-02-08 | 2018-07-31 | 广东高而美制冷设备有限公司 | A kind of tune valve method of the best aperture of electric expansion valve and adjust valve gear |
| CN109506315A (en) * | 2018-11-29 | 2019-03-22 | 珠海格力电器股份有限公司 | Air conditioner and control method for preventing compressor from running with liquid |
| CN110513818A (en) * | 2019-08-29 | 2019-11-29 | Tcl空调器(中山)有限公司 | Air conditioner refrigeration or heating control method, air conditioner and storage medium |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007860A (en) * | 2021-04-19 | 2021-06-22 | 宁波奥克斯电气股份有限公司 | Low-voltage protection control method and device and air conditioner |
| CN114136032A (en) * | 2021-11-24 | 2022-03-04 | 广东纽恩泰新能源科技发展有限公司 | Electronic expansion valve control method and device, computer equipment and storage medium |
| CN117847745A (en) * | 2024-01-22 | 2024-04-09 | 小米科技(武汉)有限公司 | Air conditioner control method and device, electronic equipment and storage medium |
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