CN105627650B - Liquid refrigerant control method and device - Google Patents
Liquid refrigerant control method and device Download PDFInfo
- Publication number
- CN105627650B CN105627650B CN201610032651.8A CN201610032651A CN105627650B CN 105627650 B CN105627650 B CN 105627650B CN 201610032651 A CN201610032651 A CN 201610032651A CN 105627650 B CN105627650 B CN 105627650B
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- liquid
- refrigerants
- liquid refrigerants
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- gas
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- 239000007788 liquid Substances 0.000 title claims abstract description 257
- 239000003507 refrigerant Substances 0.000 title claims abstract description 158
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000000630 rising effect Effects 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 12
- 230000005494 condensation Effects 0.000 abstract description 10
- 238000009833 condensation Methods 0.000 abstract description 10
- 241000521257 Hydrops Species 0.000 abstract description 2
- 206010030113 Oedema Diseases 0.000 abstract description 2
- 238000009825 accumulation Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011897 real-time detection 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
- 230000002159 abnormal effect Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004781 supercooling 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
- 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
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a liquid refrigerant control method and a liquid refrigerant control device. Wherein, the method comprises the following steps: detecting the temperature parameter of the gas-liquid separator; judging the state of a liquid refrigerant in the gas-liquid separator based on the temperature parameter; and controlling the opening or closing of a bypass electromagnetic valve based on the state of the liquid refrigerant so as to adjust the content of the liquid refrigerant. According to the invention, the state of the liquid refrigerant in the gas-liquid separator is judged through a series of algorithms by detecting parameters such as the inlet and outlet temperature of the gas-liquid separator, the exhaust temperature and the like, and the opening and closing of the bypass electromagnetic valve are determined. Thereby maintain a lower level with liquid refrigerant in the vapour and liquid separator, reduce the demand of system refrigerant, increase the circulation of refrigerant, improve unit security and economic nature, solved the problem of hydrops in the low temperature condensation unit vapour and liquid separator to condensation unit compressor trouble has been reduced.
Description
Technical field
The present invention relates to freezing machine technical fields, in particular to a kind of liquid refrigerants control method and device.
Background technique
Cryogenic condensation unit protects unit using evacuation recycle scheme before shutdown at present, but because of component gap
System refrigerant will migrate to gas-liquid separator after the reasons such as leakage cause unit to be shut down for a long time, be easy after causing unit starting to run
It forms air-breathing and waits for liquid, cause compressor liquid hammer, and then damage compressor.Meanwhile in unit running process, because condensation unit and
There are the various special circumstances such as frequent starting in use, cause in gas-liquid separator in freezer characteristic, entire refrigeration system
A possibility that liquid refrigerants gathers forms system failure hidden danger.
Aiming at the problem that accumulation of liquid refrigerants in the prior art easily leads to compressor fault, effective solution is not yet proposed at present
Certainly scheme.
Summary of the invention
A kind of liquid refrigerants control method and device are provided in the embodiment of the present invention, to solve liquid refrigerants in the prior art
The problem of accumulation easily leads to compressor fault.
In order to solve the above technical problems, the present invention provides a kind of liquid refrigerants control methods, wherein this method comprises:
Detect the temperature parameter of gas-liquid separator；The state of liquid refrigerants in the gas-liquid separator is judged based on the temperature parameter；
State control bypass solenoid valve based on the liquid refrigerants opens or closes, to adjust the content of the liquid refrigerants.
Preferably, the temperature parameter includes at least following one: the out temperature of the gas-liquid separator, exhaust temperature
Degree.
Preferably, the temperature parameter of gas-liquid separator is detected；Judged in the gas-liquid separator based on the temperature parameter
The state of liquid refrigerants, comprising: the temperature parameter of gas-liquid separator described in repeated detection；Based on described in temperature parameter judgement
The state of liquid refrigerants in gas-liquid separator；If the state consistency for the liquid refrigerants that repeated detection obtains in specified time,
Stop detection, if it is inconsistent, detecting again.
Preferably, the state of the liquid refrigerants, comprising: no liquid refrigerants, have liquid refrigerants and liquid level it is on a declining curve,
There is liquid refrigerants and liquid level is in rising trend, have liquid refrigerants and liquid level trend is uncertain.
It is preferably based on opening or closing for the state control bypass solenoid valve of the liquid refrigerants, comprising: if described
The state of liquid refrigerants is no liquid refrigerants, or has liquid refrigerants and liquid level is on a declining curve, then controls and close the side
Three-way electromagnetic valve；If the state of the liquid refrigerants is that have liquid refrigerants and liquid level is in rising trend, or have liquid refrigerants
And liquid level trend is uncertain, then controls and open the bypass solenoid valve.
Preferably, after the bypass solenoid valve is opened in control, the method also includes: it is pre- to open the bypass solenoid valve
If after duration, the bypass solenoid valve is automatically closed.
The present invention also provides a kind of liquid refrigerants control devices, wherein the device includes: temperature detecting module, is used for
Detect the temperature parameter of gas-liquid separator；Condition judgment module, for judging the gas-liquid separator based on the temperature parameter
The state of interior liquid refrigerants；Control module, unlatching or pass for the state control bypass solenoid valve based on the liquid refrigerants
It closes, to adjust the content of the liquid refrigerants.
Preferably, the state of the liquid refrigerants, comprising: no liquid refrigerants, have liquid refrigerants and liquid level it is on a declining curve,
There is liquid refrigerants and liquid level is in rising trend, have liquid refrigerants and liquid level trend is uncertain.
Preferably, the control module includes: closing unit, for being that no liquid is cold in the state of the liquid refrigerants
Matchmaker, or have liquid refrigerants and liquid level it is on a declining curve in the case where, the bypass solenoid valve is closed in control；Opening unit,
There is liquid refrigerants and liquid level is in rising trend for being in the state of the liquid refrigerants, or has liquid refrigerants and liquid level becomes
In the uncertain situation of gesture, the bypass solenoid valve is opened in control.
The present invention judges gas by serial algorithm by the detection parameters such as gas-liquid separator out temperature and delivery temperature
The state of liquid refrigerants in liquid/gas separator, determines the open and close of bypass solenoid valve.Thus by liquid refrigerants in gas-liquid separator
A reduced levels are maintained, the demand of system refrigerant is reduced, increase the circulation of refrigerant, improve unit safety and economy
Property, solve the problems, such as hydrops in cryogenic condensation unit gas-liquid separator, to reduce condensation unit compressor fault.
Detailed description of the invention
Fig. 1 is liquid refrigerants control method flow chart according to an embodiment of the present invention；
Fig. 2 is the flow chart according to an embodiment of the present invention based on liquid refrigerants state control bypass solenoid valve；
Fig. 3 is condensation machine set system organigram according to an embodiment of the present invention；
Fig. 4 is the structural block diagram of liquid refrigerants control device according to an embodiment of the present invention.
Specific embodiment
Present invention is further described in detail in the following with reference to the drawings and specific embodiments, but not as to limit of the invention
It is fixed.
Embodiment one
Fig. 1 is liquid refrigerants control method flow chart according to an embodiment of the present invention, as shown in Figure 1, this method include with
Lower step (step S102- step S106):
Step S102 detects the temperature parameter of gas-liquid separator, which includes at least following one: gas-liquid separation
The out temperature of device, delivery temperature；
Step S104 judges the state of liquid refrigerants in gas-liquid separator based on temperature parameter；
Step S106, the state control bypass solenoid valve based on liquid refrigerants opens or closes, to adjust liquid refrigerants
Content.
The present embodiment is judged by the detection parameters such as gas-liquid separator out temperature and delivery temperature by serial algorithm
The state of liquid refrigerants in gas-liquid separator, determines the open and close of bypass solenoid valve.To which liquid in gas-liquid separator is cold
Matchmaker maintains a reduced levels, reduces the demand of system refrigerant, increases the circulation of refrigerant, improves unit safety and warp
Ji property.
In order to guarantee the judgment accuracy of liquid refrigerants state, the temperature ginseng of repeated detection gas-liquid separator can choose
Number, if specified time (such as: the 5s) state consistency for the liquid refrigerants that interior repeated detection obtains stops detecting, determines liquid
The state of state refrigerant；If it is inconsistent, detecting again.
The state of liquid refrigerants can be divided into following four classes: 1) having liquid refrigerants without liquid refrigerants, 2) and liquid level is in decline
3) trend has liquid refrigerants and liquid level is in rising trend, 4) has liquid refrigerants and liquid level trend uncertain.
For preceding two classes state, need to control closing bypass solenoid valve；For rear two classes state, need to control unlatching bypass
Solenoid valve, the duration for opening bypass solenoid valve can be default according to project situation, and after opening preset duration, bypass electricity is automatically closed
Magnet valve.
Certainly, the state of liquid refrigerants can also have other mode classifications, it is only necessary to can distinguish liquid refrigerants and
Fluid level condition needs to lower this case, bypass solenoid valve can be opened, by feed flow refrigerant in gas-liquid separator
Liquid refrigerants is heated, so that the rapid politics and law of liquid refrigerants, reduce liquid refrigerants content until eliminating.
Embodiment two
For clearer description technical solution of the present invention, below by preferred embodiments and drawings to skill of the invention
Art scheme describes in detail.
Fig. 2 is the flow chart according to an embodiment of the present invention based on liquid refrigerants state control bypass solenoid valve, such as Fig. 2 institute
Show, which includes:
Step S201 detects the parameters such as gas-liquid separator out temperature and delivery temperature.
Step S202 judges liquid refrigerants situation and trend in gas-liquid separator by parameters.
Fig. 3 is condensation machine set system organigram according to an embodiment of the present invention, as shown in figure 3, in freezing machine system
There are 3 temperature sensors in system, is arranged in unit exhaust outlet (exhaust gas temperature sensor), air entry (i.e. gas-liquid separator
Outlet) (blow-off port temperature sensor) and gas-liquid separator air inlet (air inlet thermistor), while in compressor air suction
Mouthful and exhaust outlet be provided with pressure sensor, liquid in gas-liquid separator may determine that in system operation by professional logical algorithm
The case where refrigerant and variation tendency.Judging result is divided into 4 class situations, specific as follows: 1, gas-liquid separator (abbreviation gas point) aneroid
State refrigerant；2, there is liquid refrigerants in gas-liquid separator and liquid level is on a declining curve；3, there are liquid refrigerants and liquid in gas-liquid separator
Position is in rising trend；4, there is liquid refrigerants in gas-liquid separator and liquid level is unchanged or can not judge variation tendency.
Step S203a, liquid refrigerants state is: without liquid refrigerants, then keeping the closed state of bypass solenoid valve, return is held
Row step S202.
Step S203b, liquid refrigerants state is: having liquid refrigerants and liquid level is on a declining curve, then keep bypass solenoid valve
Closed state, return to step S202.
Step S203c, liquid refrigerants state is: having liquid refrigerants and liquid level is in rising trend, then follow the steps S204.
Step S203d, liquid refrigerants state is: having liquid refrigerants and liquid level is unchanged or can not judge, then follow the steps
S204。
Step S204 opens bypass solenoid valve.
Step S205, bypass solenoid valve are opened Tk (preset time) and are closed afterwards.
The case where the present embodiment real-time detection judges liquid refrigerants in gas-liquid separator, preset time (such as: continuous 5 seconds)
Interior detection is judged as same situation, it is determined that otherwise the state of liquid refrigerants repeats to judge.If there is liquid in gas-liquid separator
Refrigerant and liquid level be not it is on a declining curve, then there is compressor air suction liquid hammer hidden danger.To eliminate the hidden danger, need to gas-liquid point
It is handled from liquid refrigerants in device.It condenses unit and uses novel gas-liquid separator, which ensure that compressor
In addition to this degree of superheat of enough gas and the degree of supercooling for the preceding liquid that throttles judge in gas-liquid separator by logical algorithm
Liquid refrigerants situation, when there are above situation 3,4, can opening bypass solenoid valve, (opening time, Tk was set according to project situation
It is fixed, such as freezer and condensation unit distance, freezer size etc.).Liquid refrigerants in gas-liquid separator is carried out by feed flow refrigerant
Heating, evaporates liquid refrigerants rapidly, reduces liquid refrigerants content until eliminating.To efficiently solve cryogenic condensation unit frequency
After numerous start and stop and long-term shutdown in gas-liquid separator caused by the abnormal conditions such as secondary opening the problem of accumulation liquid refrigerants.
Embodiment three
Corresponding to the liquid refrigerants control method of Fig. 1 introduction, a kind of liquid refrigerants control device is present embodiments provided, such as
The structural block diagram of liquid refrigerants control device shown in Fig. 4, the device include:
Temperature detecting module 10, for detecting the temperature parameter of gas-liquid separator；
Condition judgment module 20 is connected to temperature detecting module 10, for being judged in gas-liquid separator based on temperature parameter
The state of liquid refrigerants；
Control module 30 is connected to condition judgment module 20, controls bypass solenoid valve for the state based on liquid refrigerants
Open or close, to adjust the content of liquid refrigerants.
The state of liquid refrigerants can be divided into following four classes: 1) having liquid refrigerants without liquid refrigerants, 2) and liquid level is in decline
3) trend has liquid refrigerants and liquid level is in rising trend, 4) has liquid refrigerants and liquid level trend uncertain.
For preceding two classes state, need to control closing bypass solenoid valve；For rear two classes state, need to control unlatching bypass
Solenoid valve, the duration for opening bypass solenoid valve can be default according to project situation, and after opening preset duration, bypass electricity is automatically closed
Magnet valve.
Based on this, present embodiments providing a kind of preferred embodiment, i.e., above-mentioned control module 30 includes: closing unit,
For the state in liquid refrigerants be no liquid refrigerants or have liquid refrigerants and liquid level it is on a declining curve in the case where, control
System closes bypass solenoid valve；Opening unit, be for the state in liquid refrigerants have liquid refrigerants and liquid level is in rising trend, or
Person is that have in liquid refrigerants and the uncertain situation of liquid level trend, and bypass solenoid valve is opened in control.To have liquid refrigerants and
Fluid level condition needs to lower under this case, opens bypass solenoid valve, cold to the liquid in gas-liquid separator by feed flow refrigerant
Matchmaker heats, so that the rapid politics and law of liquid refrigerants, reduce liquid refrigerants content until eliminating.
From the above description it is found that technical solution of the present invention passes through system temperature sensor etc. in unit use process
Real-time detection judges that there are situations and variation tendency for liquid refrigerants in gas-liquid separator, are reduced using gas-liquid separator recessive traits
Liquid refrigerants content eliminates compressor air suction liquid hammer hidden danger.
It certainly, is the preferred embodiment of the present invention above.It should be pointed out that for those skilled in the art
For, without departing from the basic principles of the invention, several improvements and modifications can also be made, these improvements and modifications
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of liquid refrigerants control method, which is characterized in that the described method includes:
Detect the temperature parameter of gas-liquid separator；Wherein, the temperature parameter includes at least following one: the gas-liquid separator
Out temperature, delivery temperature；
The state of liquid refrigerants in the gas-liquid separator is judged based on the temperature parameter；
State control bypass solenoid valve based on the liquid refrigerants opens or closes, to adjust containing for the liquid refrigerants
Amount.
2. the method according to claim 1, wherein the temperature parameter of detection gas-liquid separator；Based on the temperature
Degree parameter judges the state of liquid refrigerants in the gas-liquid separator, comprising:
The temperature parameter of gas-liquid separator described in repeated detection；Liquid in the gas-liquid separator is judged based on the temperature parameter
The state of refrigerant；
If the state consistency for the liquid refrigerants that repeated detection obtains in specified time stops detecting, if it is inconsistent, weight
New detection.
3. the method according to claim 1, wherein the state of the liquid refrigerants, comprising:
No liquid refrigerants has liquid refrigerants and liquid level is on a declining curve, have liquid refrigerants and liquid level is in rising trend, has liquid cold
Matchmaker and liquid level trend are uncertain.
4. according to the method described in claim 3, it is characterized in that, the state based on the liquid refrigerants controls bypass solenoid valve
Open or close, comprising:
If the state of the liquid refrigerants is no liquid refrigerants, or has liquid refrigerants and liquid level is on a declining curve, then control
System closes the bypass solenoid valve；
If the state of the liquid refrigerants is that have liquid refrigerants and liquid level is in rising trend, or have liquid refrigerants and liquid level
Trend is uncertain, then controls and open the bypass solenoid valve.
5. according to the method described in claim 4, it is characterized in that, after control opens the bypass solenoid valve, the method
Further include:
After opening the bypass solenoid valve preset duration, the bypass solenoid valve is automatically closed.
6. a kind of liquid refrigerants control device, which is characterized in that described device includes:
Temperature detecting module, for detecting the temperature parameter of gas-liquid separator；Wherein, the temperature parameter include at least it is following it
One: the out temperature of the gas-liquid separator, delivery temperature；
Condition judgment module, for judging the state of liquid refrigerants in the gas-liquid separator based on the temperature parameter；
Control module, for opening or closing for the state control bypass solenoid valve based on the liquid refrigerants, described in adjustment
The content of liquid refrigerants.
7. device according to claim 6, which is characterized in that the state of the liquid refrigerants, comprising:
No liquid refrigerants has liquid refrigerants and liquid level is on a declining curve, have liquid refrigerants and liquid level is in rising trend, has liquid cold
Matchmaker and liquid level trend are uncertain.
8. device according to claim 7, which is characterized in that the control module includes:
Closing unit for being no liquid refrigerants in the state of the liquid refrigerants, or has liquid refrigerants and under liquid level is in
In the case where drop trend, the bypass solenoid valve is closed in control；
Opening unit, for being to have liquid refrigerants and liquid level is in rising trend, or have liquid in the state of the liquid refrigerants
Under state refrigerant and the uncertain situation of liquid level trend, the bypass solenoid valve is opened in control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610032651.8A CN105627650B (en) | 2016-01-18 | 2016-01-18 | Liquid refrigerant control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610032651.8A CN105627650B (en) | 2016-01-18 | 2016-01-18 | Liquid refrigerant control method and device |
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| CN105627650A CN105627650A (en) | 2016-06-01 |
| CN105627650B true CN105627650B (en) | 2018-12-14 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106196792A (en) * | 2016-08-24 | 2016-12-07 | 珠海格力电器股份有限公司 | Accumulated liquid control method and device of gas-liquid separator and air conditioner system |
| CN107314584B (en) * | 2017-07-26 | 2019-10-08 | 珠海格力电器股份有限公司 | Air-conditioning system and liquid accumulation control method of gas-liquid separator |
| CN109162967B (en) * | 2018-11-06 | 2024-01-02 | 珠海格力电器股份有限公司 | Bearing cooling device, compressor, and bearing cooling control method |
| CN111023564B (en) * | 2019-11-18 | 2022-05-06 | Tcl空调器(中山)有限公司 | Heat pump system control method, air source heat pump water heater |
| CN111306855B (en) * | 2020-02-26 | 2021-01-08 | 珠海格力电器股份有限公司 | Refrigerant heating control method and device for improving stability and air conditioning equipment |
| CN113503662B (en) * | 2021-07-20 | 2022-07-12 | 美的集团武汉暖通设备有限公司 | Air conditioning system and control method thereof |
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