CN105627650A - Liquid refrigerant control method and device - Google Patents
Liquid refrigerant control method and device Download PDFInfo
- Publication number
- CN105627650A CN105627650A CN201610032651.8A CN201610032651A CN105627650A CN 105627650 A CN105627650 A CN 105627650A CN 201610032651 A CN201610032651 A CN 201610032651A CN 105627650 A CN105627650 A CN 105627650A
- Authority
- CN
- China
- Prior art keywords
- liquid
- liquid refrigerants
- refrigerants
- state
- gas
- 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.)
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Links
- 239000007788 liquid Substances 0.000 title claims abstract description 258
- 239000003507 refrigerant Substances 0.000 title claims abstract description 155
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims description 15
- 230000000630 rising effect Effects 0.000 claims description 13
- 230000005494 condensation Effects 0.000 abstract description 9
- 238000009833 condensation Methods 0.000 abstract description 9
- 206010030113 Oedema Diseases 0.000 abstract description 3
- 241000521257 Hydrops Species 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 description 8
- 230000008014 freezing Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 208000035475 disorder Diseases 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005057 refrigeration 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)
- Air Conditioning Control Device (AREA)
- Separation By Low-Temperature Treatments (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 field, in particular to a kind of liquid refrigerants control method and device.
Background technology
Current condensation at low temperature unit adopts evacuation recycle scheme that unit is protected before shutdown; but system coolant will migrate to gas-liquid separator after causing unit to be shut down for a long time because of reasons such as components and parts slot leakages; easily form air-breathing after causing unit starting to run and treat liquid; cause compressor liquid hammer, and then damage compressor. Meanwhile, in unit running process, because of condensation unit and freezer characteristic, in use there are the various special circumstances such as frequent starting in whole refrigeration system, causes the probability that in gas-liquid separator, liquid refrigerants gathers, and forms system failure hidden danger.
Gather the problem being easily caused compressor fault for liquid refrigerants in prior art, not yet propose effective solution at present.
Summary of the invention
The embodiment of the present invention provides a kind of liquid refrigerants control method and device, the problem being easily caused compressor fault to solve liquid refrigerants in prior art to gather.
For solving above-mentioned technical problem, the invention provides a kind of liquid refrigerants control method, wherein, the method includes: the temperature parameter of detection gas-liquid separator; The state of liquid refrigerants in described gas-liquid separator is judged based on described temperature parameter; State based on described liquid refrigerants controls being turned on and off of bypass solenoid valve, to adjust the content of described liquid refrigerants.
Preferably, described temperature parameter at least includes one below: the out temperature of described gas-liquid separator, delivery temperature.
Preferably, the temperature parameter of gas-liquid separator is detected; The state of liquid refrigerants in described gas-liquid separator is judged based on described temperature parameter, including: the temperature parameter of gas-liquid separator described in repeated detection; The state of liquid refrigerants in described gas-liquid separator is judged based on described temperature parameter; If the state consistency of the liquid refrigerants that repeated detection obtains in the appointment time, then stop detection, if it is inconsistent, again detect.
Preferably, the state of described liquid refrigerants, including: without liquid refrigerants, there is liquid refrigerants and liquid level is on a declining curve, have liquid refrigerants and liquid level is in rising trend, have liquid refrigerants and liquid level trend uncertain.
The state being preferably based on described liquid refrigerants controls being turned on and off of bypass solenoid valve, including: if the state of described liquid refrigerants is without liquid refrigerants, or there are liquid refrigerants and liquid level on a declining curve, then control to close described bypass solenoid valve; If the state of described liquid refrigerants is to have liquid refrigerants and liquid level in rising trend, or there are liquid refrigerants and liquid level trend uncertain, then control to open described bypass solenoid valve.
Preferably, after controlling to open described bypass solenoid valve, described method also includes: after opening described bypass solenoid valve preset duration, be automatically switched off described bypass solenoid valve.
Present invention also offers a kind of liquid refrigerants and control device, wherein, this device includes: temperature detecting module, for detecting the temperature parameter of gas-liquid separator; Condition judgment module, for judging the state of liquid refrigerants in described gas-liquid separator based on described temperature parameter; Control module, for controlling being turned on and off of bypass solenoid valve based on the state of described liquid refrigerants, to adjust the content of described liquid refrigerants.
Preferably, the state of described liquid refrigerants, including: without liquid refrigerants, there is liquid refrigerants and liquid level is on a declining curve, have liquid refrigerants and liquid level is in rising trend, have liquid refrigerants and liquid level trend uncertain.
Preferably, described control module includes: closing unit, is without liquid refrigerants for the state at described liquid refrigerants, or when having liquid refrigerants and liquid level on a declining curve, controls to close described bypass solenoid valve; Open unit, be have liquid refrigerants and liquid level in rising trend for the state at described liquid refrigerants, or have in liquid refrigerants and the uncertain situation of liquid level trend, control to open described bypass solenoid valve.
The present invention, by detecting the parameter such as gas-liquid separator out temperature and delivery temperature, judges the state of liquid refrigerants in gas-liquid separator through serial algorithm, it is determined that the open and close of bypass solenoid valve. Thus liquid refrigerants in gas-liquid separator being maintained a reduced levels, the demand of minimizing system coolant, increases the circulation of coolant, improves unit safety and economy, solve the problem of hydrops in condensation at low temperature unit gas-liquid separator, thus decreasing condensation unit compressor fault.
Accompanying drawing explanation
Fig. 1 is liquid refrigerants control method flow chart according to embodiments of the present invention;
Fig. 2 is the flow chart controlling bypass solenoid valve based on liquid refrigerants state according to embodiments of the present invention;
Fig. 3 is freezing machine group system organigram according to embodiments of the present invention;
Fig. 4 is the structured flowchart that liquid refrigerants according to embodiments of the present invention controls device.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but not as a limitation of the invention.
Embodiment one
Fig. 1 is liquid refrigerants control method flow chart according to embodiments of the present invention, as it is shown in figure 1, the method comprises the following steps (step S102-step S106):
Step S102, the temperature parameter of detection gas-liquid separator, this temperature parameter at least includes one below: the out temperature of gas-liquid separator, delivery temperature;
Step S104, judges the state of liquid refrigerants in gas-liquid separator based on temperature parameter;
Step S106, the state based on liquid refrigerants controls being turned on and off of bypass solenoid valve, to adjust the content of liquid refrigerants.
The present embodiment, by detecting the parameter such as gas-liquid separator out temperature and delivery temperature, judges the state of liquid refrigerants in gas-liquid separator through serial algorithm, it is determined that the open and close of bypass solenoid valve. Thus liquid refrigerants in gas-liquid separator being maintained a reduced levels, reducing the demand of system coolant, increasing the circulation of coolant, improve unit safety and economy.
In order to ensure the judgment accuracy of liquid refrigerants state, the temperature parameter of repeated detection gas-liquid separator can be selected, if the state consistency of the liquid refrigerants that appointment time (such as: 5s) interior repeated detection obtains, then stop detection, it is determined that the state of liquid refrigerants; If it is inconsistent, again detect.
The state of liquid refrigerants can be divided into following four classes: 1) without liquid refrigerants, 2) have liquid refrigerants and liquid level is on a declining curve, 3) have liquid refrigerants and liquid level is in rising trend, 4) have liquid refrigerants and liquid level trend uncertain.
For front two class states, it is necessary to control to close bypass solenoid valve; For rear two class states, it is necessary to control to open bypass solenoid valve, the duration opening bypass solenoid valve can be preset according to project situation, after opening preset duration, is automatically switched off bypass solenoid valve.
Certainly, the state of liquid refrigerants can also have other mode classifications, have only to have distinguished liquid refrigerants and fluid level condition needs to lower this situation, just bypass solenoid valve can be opened, by feed flow coolant, the liquid refrigerants in gas-liquid separator is heated, making the rapid politics and law of liquid refrigerants, reducing liquid refrigerants content until eliminating.
Embodiment two
For clearer description technical scheme, below by preferred embodiments and drawings, technical scheme is described in detail.
Fig. 2 is the flow chart controlling bypass solenoid valve based on liquid refrigerants state according to embodiments of the present invention, as in figure 2 it is shown, this flow process includes:
Step S201, detects the parameter 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 freezing machine group system organigram according to embodiments of the present invention, as shown in Figure 3, freezing machine group system has 3 temperature sensors, it is arranged in unit air vent (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), compressor air suction mouth and air vent are provided with pressure transducer simultaneously, be may determine that situation and the variation tendency of liquid refrigerants in gas-liquid separator in system operation by specialty logical algorithm. Judged result is divided into 4 class situations, specific as follows: 1, gas-liquid separator (abbreviation edema caused by disorder of QI) is without liquid refrigerants; 2, there are liquid refrigerants and liquid level on a declining curve in gas-liquid separator; 3, there are liquid refrigerants and liquid level in rising trend in gas-liquid separator; 4, there is liquid refrigerants in gas-liquid separator and liquid level is unchanged maybe cannot judge variation tendency.
Step S203a, liquid refrigerants state is: without liquid refrigerants, then keep the closed mode of bypass solenoid valve, returns and performs step S202.
Step S203b, liquid refrigerants state is: have liquid refrigerants and liquid level on a declining curve, then keep the closed mode of bypass solenoid valve, returns and performs step S202.
Step S203c, liquid refrigerants state is: have liquid refrigerants and liquid level in rising trend, then perform step S204.
Step S203d, liquid refrigerants state is: have liquid refrigerants and liquid level is unchanged maybe cannot judge, then perform step S204.
Step S204, opens bypass solenoid valve.
Step S205, bypass solenoid valve is opened Tk (Preset Time) and is closed afterwards.
The present embodiment detects in real time and judges the situation of liquid refrigerants in gas-liquid separator, and in Preset Time (such as: continuous 5 seconds), detection is judged as same situation, it is determined that the state of liquid refrigerants, otherwise repeats to judge. If it is not on a declining curve for having liquid refrigerants and liquid level in gas-liquid separator, then there is compressor air suction liquid hammer hidden danger. For eliminating this hidden danger, it is necessary to liquid refrigerants in gas-liquid separator is processed. Condensation unit adopts Novel gas-liquid separator, this gas-liquid separator ensure that the degree of superheat of the enough gas of compressor and the degree of supercooling of the front liquid of throttling, in addition, liquid refrigerants situation in gas-liquid separator is judged through logical algorithm, when there are above-mentioned situation 3,4, bypass solenoid valve (opening time Tk sets, for instance freezer and condensation unit distance, freezer size etc.) can be opened according to project situation. By feed flow coolant, liquid refrigerants in gas-liquid separator being heated, make liquid refrigerants evaporate rapidly, reducing liquid refrigerants content until eliminating. Thus efficiently solve condensation at low temperature unit frequent start-stop and long-term shut down after the problem of gas-liquid separator inner accumulated liquid refrigerants that causes of the abnormal conditions such as secondary opening.
Embodiment three
Corresponding to Fig. 1 liquid refrigerants control method introduced, present embodiments providing a kind of liquid refrigerants and control device, liquid refrigerants as shown in Figure 4 controls the structured flowchart of device, and this device includes:
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 judging the state of liquid refrigerants in gas-liquid separator based on temperature parameter;
Control module 30, be connected to condition judgment module 20, for controlling being turned on and off of bypass solenoid valve based on the state of liquid refrigerants, to adjust the content of liquid refrigerants.
The state of liquid refrigerants can be divided into following four classes: 1) without liquid refrigerants, 2) have liquid refrigerants and liquid level is on a declining curve, 3) have liquid refrigerants and liquid level is in rising trend, 4) have liquid refrigerants and liquid level trend uncertain.
For front two class states, it is necessary to control to close bypass solenoid valve; For rear two class states, it is necessary to control to open bypass solenoid valve, the duration opening bypass solenoid valve can be preset according to project situation, after opening preset duration, is automatically switched off bypass solenoid valve.
Based on this, present embodiments providing a kind of preferred implementation, namely above-mentioned control module 30 includes: closing unit, is without liquid refrigerants for the state at liquid refrigerants, or when having liquid refrigerants and liquid level on a declining curve, control to close bypass solenoid valve; Open unit, be have liquid refrigerants and liquid level in rising trend for the state at liquid refrigerants, or have in liquid refrigerants and the uncertain situation of liquid level trend, control to open bypass solenoid valve. Thus lowering in this situation having liquid refrigerants and fluid level condition to need, opening bypass solenoid valve, by feed flow coolant, the liquid refrigerants in gas-liquid separator being heated so that the rapid politics and law of liquid refrigerants, reducing liquid refrigerants content until eliminating.
In from the description above known, by detections in real time such as system temperature sensors, technical solution of the present invention judges that in gas-liquid separator, liquid refrigerants exists situation and variation tendency in unit use procedure, utilize gas-liquid separator recessive traits to reduce liquid refrigerants content, eliminate compressor air suction liquid hammer hidden danger.
Certainly, it is above the preferred embodiment of the present invention. It should be pointed out that, for those skilled in the art, under the premise without departing from its general principles, it is also possible to make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (9)
1. a liquid refrigerants control method, it is characterised in that described method includes:
The temperature parameter of detection gas-liquid separator;
The state of liquid refrigerants in described gas-liquid separator is judged based on described temperature parameter;
State based on described liquid refrigerants controls being turned on and off of bypass solenoid valve, to adjust the content of described liquid refrigerants.
2. method according to claim 1, it is characterised in that described temperature parameter at least includes one below:
The out temperature of described gas-liquid separator, delivery temperature.
3. method according to claim 1, it is characterised in that the temperature parameter of detection gas-liquid separator; The state of liquid refrigerants in described gas-liquid separator is judged based on described temperature parameter, including:
The temperature parameter of gas-liquid separator described in repeated detection; The state of liquid refrigerants in described gas-liquid separator is judged based on described temperature parameter;
If the state consistency of the liquid refrigerants that repeated detection obtains in the appointment time, then stop detection, if it is inconsistent, again detect.
4. method according to claim 1, it is characterised in that the state of described liquid refrigerants, including:
Without liquid refrigerants, there is liquid refrigerants and liquid level is on a declining curve, have liquid refrigerants and liquid level is in rising trend, have liquid refrigerants and liquid level trend uncertain.
5. method according to claim 4, it is characterised in that the state based on described liquid refrigerants controls being turned on and off of bypass solenoid valve, including:
If the state of described liquid refrigerants is without liquid refrigerants, or there are liquid refrigerants and liquid level on a declining curve, then control to close described bypass solenoid valve;
If the state of described liquid refrigerants is to have liquid refrigerants and liquid level in rising trend, or there are liquid refrigerants and liquid level trend uncertain, then control to open described bypass solenoid valve.
6. method according to claim 5, it is characterised in that after controlling to open described bypass solenoid valve, described method also includes:
After opening described bypass solenoid valve preset duration, it is automatically switched off described bypass solenoid valve.
7. a liquid refrigerants controls device, it is characterised in that described device includes:
Temperature detecting module, for detecting the temperature parameter of gas-liquid separator;
Condition judgment module, for judging the state of liquid refrigerants in described gas-liquid separator based on described temperature parameter;
Control module, for controlling being turned on and off of bypass solenoid valve based on the state of described liquid refrigerants, to adjust the content of described liquid refrigerants.
8. device according to claim 7, it is characterised in that the state of described liquid refrigerants, including:
Without liquid refrigerants, there is liquid refrigerants and liquid level is on a declining curve, have liquid refrigerants and liquid level is in rising trend, have liquid refrigerants and liquid level trend uncertain.
9. device according to claim 8, it is characterised in that described control module includes:
Closing unit, is without liquid refrigerants for the state at described liquid refrigerants, or when having liquid refrigerants and liquid level on a declining curve, controls to close described bypass solenoid valve;
Open unit, be have liquid refrigerants and liquid level in rising trend for the state at described liquid refrigerants, or have in liquid refrigerants and the uncertain situation of liquid level trend, control to open described bypass solenoid valve.
Priority Applications (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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| 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 true CN105627650A (en) | 2016-06-01 |
| CN105627650B CN105627650B (en) | 2018-12-14 |
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Cited By (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 |
| CN107314584A (en) * | 2017-07-26 | 2017-11-03 | 珠海格力电器股份有限公司 | Air conditioning system and gas-liquid separator accumulated liquid control method |
| CN109162967A (en) * | 2018-11-06 | 2019-01-08 | 珠海格力电器股份有限公司 | Bearing cooling device, compressor, and bearing cooling control method |
| CN111023564A (en) * | 2019-11-18 | 2020-04-17 | Tcl空调器(中山)有限公司 | Heat pump system, control method thereof and air source heat pump water heater |
| WO2021169533A1 (en) * | 2020-02-26 | 2021-09-02 | 珠海格力电器股份有限公司 | Refrigerant heating control method and apparatus capable of improving stability, and air conditioning device |
| CN113503662A (en) * | 2021-07-20 | 2021-10-15 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN107314584A (en) * | 2017-07-26 | 2017-11-03 | 珠海格力电器股份有限公司 | Air conditioning system and gas-liquid separator accumulated liquid control method |
| CN107314584B (en) * | 2017-07-26 | 2019-10-08 | 珠海格力电器股份有限公司 | Air conditioning system and gas-liquid separator accumulated liquid control method |
| CN109162967A (en) * | 2018-11-06 | 2019-01-08 | 珠海格力电器股份有限公司 | Bearing cooling device, compressor, and bearing cooling control method |
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| CN111023564A (en) * | 2019-11-18 | 2020-04-17 | Tcl空调器(中山)有限公司 | Heat pump system, control method thereof and air source heat pump water heater |
| CN111023564B (en) * | 2019-11-18 | 2022-05-06 | Tcl空调器(中山)有限公司 | Heat pump system control method and air source heat pump water heater |
| WO2021169533A1 (en) * | 2020-02-26 | 2021-09-02 | 珠海格力电器股份有限公司 | Refrigerant heating control method and apparatus capable of improving stability, and air conditioning device |
| CN113503662A (en) * | 2021-07-20 | 2021-10-15 | 美的集团武汉暖通设备有限公司 | Air conditioning system and control method thereof |
| 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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| Publication number | Publication date |
|---|---|
| CN105627650B (en) | 2018-12-14 |
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