CN109579350A - A kind of multi-line system and its control method avoiding the occurrence of back liquid - Google Patents
A kind of multi-line system and its control method avoiding the occurrence of back liquid Download PDFInfo
- Publication number
- CN109579350A CN109579350A CN201811479560.4A CN201811479560A CN109579350A CN 109579350 A CN109579350 A CN 109579350A CN 201811479560 A CN201811479560 A CN 201811479560A CN 109579350 A CN109579350 A CN 109579350A
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- temperature
- indoor unit
- set heat
- indoor set
- 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.)
- Pending
Links
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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
- F25B31/00—Compressor arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention relates to a kind of multi-line systems and its control method for avoiding the occurrence of back liquid, and two ports of the indoor unit including outdoor unit and multiple parallel connections, each indoor set heat exchanger are equipped with solenoid valve；The outside of the indoor set heat exchanger, two end interfaces and middle part pipeline are respectively equipped with temperature sensor.Control method of the invention are as follows: compare the temperature and environment temperature of indoor set heat exchanger, and control electronic expansion valve of indoor unit movement, then compare the temperature and environment temperature of indoor set heat exchanger again, determine whether the electric expansion valve is normal, if abnormal, the solenoid valve on indoor set heat exchanger is then closed immediately, avoids excessive liquid refrigerants from entering gas-liquid separator, liquid hammer risk is brought to compressor.
Description
Technical field
The present invention relates to a kind of air-conditioning technical, especially a kind of multi-line system and its control method reliable for operation, tool
Saying for body is a kind of multi-line system and its control method for avoiding the occurrence of back liquid.
Background technique
In multi-online air-conditioning system, compressor is as core component, once it will lead to compressor there is a phenomenon where liquid hammer
Damage, influences the operational effect of entire unit.And many reason of returning liquid of compressor are generated, one of them is when indoor unit stops
When machine (or being shut down to temperature spot), due to electric expansion valve failure, causes it that can not be closed, excessive liquid refrigerants is made to enter gas
Liquid/gas separator is easy to happen system and returns liquid, compressor is made to face the risk of liquid hammer.
Currently, preventing the measure of above-mentioned risk and few, moreover, mostly structure is complicated, higher cost, control is inconvenient, difficult
To meet the needs of users.
Summary of the invention
The purpose of the present invention is provide one kind and keep away for the currently problem encountered in terms of preventing multi-line system from returning liquid
Exempt from the multi-line system for liquid occur back and its control method, can under the premise of ensuring multi-line system safe and highly efficient operation,
It avoids the occurrence of system and returns liquid phenomenon, eliminate compressor liquid hammer hidden danger, sufficiently meet the market demand.
The technical scheme is that
A kind of multi-line system avoiding the occurrence of back liquid, the indoor unit including outdoor unit and multiple parallel connections, the outdoor unit include
Compressor, oil eliminator, four-way valve, outdoor unit heat exchanger, orifice union and gas-liquid separator, each indoor unit includes room
Interior machine heat exchanger and electric expansion valve；The outdoor unit is connected by liquid pipe and tracheae with the indoor unit, and refrigerant circulation is constituted
Two ports in circuit, each indoor set heat exchanger are equipped with solenoid valve；The outside of the indoor set heat exchanger, two terminations
Mouth and central tube road are respectively equipped with temperature sensor.
Further, the solenoid valve and temperature sensor are electrically connected with the control panel of system, make the control panel
Temperature information can be obtained and the solenoid valve is controlled.
A kind of control method for the multi-line system avoiding the occurrence of back liquid, comprising the following steps:
1) it is switched on, system operates normally；
2) when detecting indoor unit communication abnormality, the indoor unit is judged to shut down；
3) the environment temperature TH1 of indoor unit and arrival end temperature Ti1 and the middle part of the shutdown indoor set heat exchanger are shut down in detection
Temperature Tm1, and take small value Tc1=Min [Ti1, Tm1] therein；
4) if TH1-10 DEG C of Tc1 >, goes to step 1)；
5) electric expansion valve for shutting down indoor unit is first opened big A to walk, then opens small B step；Wherein, B > A；
6) again detection shut down indoor unit environment temperature TH2 and the shutdown indoor set heat exchanger arrival end temperature Ti2 and
Middle portion temperature Tm2, and take small value Tc2=Min [Ti2, Tm2] therein；
7) if TH2-10 DEG C of Tc2 >, goes to step 1)；
8) solenoid valve for shutting down indoor unit is closed, meanwhile, fault alarm.
Beneficial effects of the present invention:
Rationally, structure is simple, easy to control for present aspect design, can be when machine is shut down indoors, and the indoor electromechanics of detection in time is sub
Whether expansion valve is normal, and closes the abnormal electric expansion valve of work in time, and excessive liquid refrigerants is avoided to enter gas-liquid separation
Device brings liquid hammer risk to compressor.Moreover, also avoidable system high pressure in a heating mode is too low, row's temperature is excessively low existing
As, it is ensured that system safe and highly efficient operation.
Detailed description of the invention
Fig. 1 is present system structural schematic diagram.
Fig. 2 is the schematic diagram of indoor set heat exchanger part in the present invention.
Fig. 3 control flow schematic diagram of the present invention.
Wherein: 1- compressor；2- oil eliminator；3- four-way valve；4- outdoor unit heat exchanger；5- orifice union；6- indoor unit
Heat exchanger；7- solenoid valve；8- electric expansion valve；9- gas-liquid separator.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As illustrated in fig. 1 and 2.
A kind of multi-line system avoiding the occurrence of back liquid, the indoor unit including outdoor unit and multiple parallel connections.The outdoor unit
Including compressor 1, oil eliminator 2, four-way valve 3, outdoor unit heat exchanger 4, orifice union 5 and gas-liquid separator 9.Each room
Interior machine includes indoor set heat exchanger 6 and electric expansion valve 8 etc.；The outdoor unit passes through liquid pipe and tracheae and the indoor unit phase
Even, refrigerant circulation circuit is constituted.Two ports of each indoor set heat exchanger 6 are equipped with solenoid valve 7, can control port
On-off flows through indoor set heat exchanger to control refrigerant.The outside of the indoor set heat exchanger 6 is equipped with temperature sensor, can
Sense the environment temperature of indoor unit.Meanwhile both ends interface and the central tube road of the indoor set heat exchanger 6 are respectively equipped with temperature
Sensor is spent, the temperature at sensing ports and middle part is capable of.The solenoid valve 7 and temperature sensor are electric with the control panel of system
Property connection, so that the control panel is obtained temperature information and is controlled the solenoid valve.
As shown in figure 3, a kind of control method for the multi-line system for avoiding the occurrence of back liquid, comprising the following steps:
1) it is switched on, system operates normally；
2) when detecting indoor unit communication abnormality, the indoor unit is judged to shut down；
3) the environment temperature TH1 of indoor unit and arrival end temperature Ti1 and the middle part of the shutdown indoor set heat exchanger are shut down in detection
Temperature Tm1, and take small value Tc1=Min [Ti1, Tm1] therein；
4) if TH1-10 DEG C of Tc1 >, goes to step 1)；
5) electric expansion valve for shutting down indoor unit is first opened big A to walk, then opens small B step；Wherein, B > A；
6) again detection shut down indoor unit environment temperature TH2 and the shutdown indoor set heat exchanger arrival end temperature Ti2 and
Middle portion temperature Tm2, and take small value Tc2=Min [Ti2, Tm2] therein；
7) if TH2-10 DEG C of Tc2 >, goes to step 1)；
8) solenoid valve for shutting down indoor unit is closed, meanwhile, fault alarm.
The arrival end refers to that under the different working modes of system, refrigerant flows into the port of indoor set heat exchanger.Therefore,
Under different working modes, the arrival end temperature Ti1 takes the temperature of indoor set heat exchanger different port.
Whether the present invention is normal by the electric expansion valve that indoor unit is shut down in detection in time, and it is abnormal to close work in time
Electric expansion valve, avoid excessive liquid refrigerants from entering gas-liquid separator, liquid hammer risk brought to compressor.Moreover, can also keep away
Exempt from phenomena such as system high pressure in a heating mode is too low, row's temperature is too low, it is ensured that system safe and highly efficient operation.
Part that the present invention does not relate to is the same as those in the prior art or can be realized by using the prior art.
Claims (3)
1. a kind of multi-line system for avoiding the occurrence of back liquid, the indoor unit including outdoor unit and multiple parallel connections, the outdoor unit packet
Compressor, oil eliminator, four-way valve, outdoor unit heat exchanger, orifice union and gas-liquid separator are included, each indoor unit includes
Indoor set heat exchanger and electric expansion valve；The outdoor unit is connected by liquid pipe and tracheae with the indoor unit, is constituted refrigerant and is followed
Loop back path, it is characterized in that two ports of each indoor set heat exchanger are equipped with solenoid valve；The indoor set heat exchanger
External, two end interfaces and central tube road are respectively equipped with temperature sensor.
2. the multi-line system according to claim 1 for avoiding the occurrence of back liquid, it is characterized in that the solenoid valve and temperature pass
Sensor is electrically connected with the control panel of system, and the control panel is enable to obtain temperature information and control to the solenoid valve
System.
3. a kind of control method for the multi-line system for avoiding the occurrence of back liquid, it is characterized in that the following steps are included:
1) it is switched on, system operates normally；
2) when detecting indoor unit communication abnormality, the indoor unit is judged to shut down；
3) the environment temperature TH1 of indoor unit and arrival end temperature Ti1 and the middle part of the shutdown indoor set heat exchanger are shut down in detection
Temperature Tm1, and take small value Tc1=Min [Ti1, Tm1] therein；
4) if TH1-10 DEG C of Tc1 >, goes to step 1)；
5) electric expansion valve for shutting down indoor unit is first opened big A to walk, then opens small B step；Wherein, B > A；
6) again detection shut down indoor unit environment temperature TH2 and the shutdown indoor set heat exchanger arrival end temperature Ti2 and
Middle portion temperature Tm2, and take small value Tc2=Min [Ti2, Tm2] therein；
7) if TH2-10 DEG C of Tc2 >, goes to step 1)；
8) solenoid valve for shutting down indoor unit is closed, meanwhile, fault alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811479560.4A CN109579350A (en) | 2018-12-05 | 2018-12-05 | A kind of multi-line system and its control method avoiding the occurrence of back liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811479560.4A CN109579350A (en) | 2018-12-05 | 2018-12-05 | A kind of multi-line system and its control method avoiding the occurrence of back liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109579350A true CN109579350A (en) | 2019-04-05 |
Family
ID=65926310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811479560.4A Pending CN109579350A (en) | 2018-12-05 | 2018-12-05 | A kind of multi-line system and its control method avoiding the occurrence of back liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109579350A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114963603A (en) * | 2022-05-31 | 2022-08-30 | 南京天加环境科技有限公司 | System for preventing liquid return during multi-split air conditioner starting and control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110003770A (en) * | 2009-07-06 | 2011-01-13 | 엘지전자 주식회사 | Air conditioner and method for detecting error of air conditioner |
| CN201731693U (en) * | 2010-07-08 | 2011-02-02 | 宁波奥克斯电气有限公司 | Indoor unit of air conditioner |
| CN102147125A (en) * | 2010-02-04 | 2011-08-10 | 珠海格力电器股份有限公司 | Air conditioner and processing method of refrigerant thereof |
| CN105485869A (en) * | 2016-01-04 | 2016-04-13 | 广东美的暖通设备有限公司 | Electronic expansion valve fault detection method and device |
| CN107084494A (en) * | 2017-05-05 | 2017-08-22 | 广东美的暖通设备有限公司 | Fault detection method, detection means and the multi-connected air conditioning system of electric expansion valve |
-
2018
- 2018-12-05 CN CN201811479560.4A patent/CN109579350A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110003770A (en) * | 2009-07-06 | 2011-01-13 | 엘지전자 주식회사 | Air conditioner and method for detecting error of air conditioner |
| CN102147125A (en) * | 2010-02-04 | 2011-08-10 | 珠海格力电器股份有限公司 | Air conditioner and processing method of refrigerant thereof |
| CN201731693U (en) * | 2010-07-08 | 2011-02-02 | 宁波奥克斯电气有限公司 | Indoor unit of air conditioner |
| CN105485869A (en) * | 2016-01-04 | 2016-04-13 | 广东美的暖通设备有限公司 | Electronic expansion valve fault detection method and device |
| CN107084494A (en) * | 2017-05-05 | 2017-08-22 | 广东美的暖通设备有限公司 | Fault detection method, detection means and the multi-connected air conditioning system of electric expansion valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114963603A (en) * | 2022-05-31 | 2022-08-30 | 南京天加环境科技有限公司 | System for preventing liquid return during multi-split air conditioner starting and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103900138B (en) | A kind of double-compressor air energy heat pump heating system | |
| CN106871355B (en) | The control method and system of heat pump type air conditioner, the auxiliary heat of heat pump type air conditioner electricity | |
| CN203533802U (en) | Air-conditioning system | |
| CN103398520B (en) | The liquid-level detecting method of air-conditioning system and gas-liquid separator thereof | |
| CN106247530A (en) | Many air-conditionings self checking method is dragged in many control frequency conversion one | |
| CN105333660B (en) | A kind of compressor protection method of multiple on-line system | |
| CN106369891B (en) | Air-conditioner set and its control method | |
| CN104729130A (en) | Air conditioning system and control method thereof | |
| CN104729138B (en) | The determination methods of air conditioner and its volume change | |
| KR100984118B1 (en) | Outdoor air cooling ventilation unit | |
| CN104729151B (en) | The processing method and system of the compressor return line failure of air-conditioning system | |
| CN103574991A (en) | Oil return control method for multi-compressor system | |
| CN109282424A (en) | Air-conditioner control method, air conditioner controlling device | |
| CN105402936A (en) | Air conditioner water heater and refrigerant leakage detecting method and device of air conditioner water heater | |
| CN110542196B (en) | Detection assembly for air conditioner, control method, control device and air conditioner | |
| CN109579350A (en) | A kind of multi-line system and its control method avoiding the occurrence of back liquid | |
| CN203869825U (en) | Detection system and air conditioner | |
| CN103292526A (en) | Air conditioner and method for debugging refrigerant quantity in refrigerant circulating system | |
| CN105783136A (en) | Outdoor air-conditioning unit and air-conditioning system | |
| CN111520797A (en) | Floor heating multi-split air conditioner with anti-freezing monitoring function and anti-freezing control method thereof | |
| CN103913005A (en) | Refrigeration system, control method for same, and air conditioner with refrigeration system | |
| EP4006437B1 (en) | Expansion valve control method for multi-split air-conditioning system | |
| CN109556242A (en) | A kind of air conditioner muffler control method | |
| CN208254012U (en) | A kind of heat pump system | |
| CN206449924U (en) | Heat-exchange system and air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190405 |
|
| RJ01 | Rejection of invention patent application after publication |