CN102331124A - Control method for preventing multi-unit air conditioner screw compressor from liquid impact - Google Patents
Control method for preventing multi-unit air conditioner screw compressor from liquid impact Download PDFInfo
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- CN102331124A CN102331124A CN201110142549A CN201110142549A CN102331124A CN 102331124 A CN102331124 A CN 102331124A CN 201110142549 A CN201110142549 A CN 201110142549A CN 201110142549 A CN201110142549 A CN 201110142549A CN 102331124 A CN102331124 A CN 102331124A
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Abstract
The invention discloses a control method for preventing a multi-unit air conditioner screw compressor from liquid impact. The method comprises the following steps of: (1) closing each electromagnetic valve and closing an electronic expansion valve of each indoor unit when an air conditioning unit is electrified and stands by; (2) when oil temperature of an oil sump reaches a set oil temperature, opening a master liquid supply electromagnetic valve, opening a liquid supply electromagnetic valve on a liquid supply pipe of an indoor unit which receives a power-on instruction, opening the electronic expansion valve of the indoor unit, and loading the screw compressor in a gradient way until the screw compressor is fully loaded; (3) opening an electromagnetic valve on a gas-liquid separator oil return pipe when the total load of the indoor unit is in a partial load condition; (4) closing a liquid supply electromagnetic valve and the electronic expansion valve on the corresponding liquid supply pipe when a certain indoor unit is stopped; and (5) when the indoor unit is stopped, closing the master liquid supply electromagnetic valve, closing the electromagnetic valves and the electronic expansion valves on the liquid supply pipes of all the indoor units, and then stopping the screw compressor. Compared with the conventional method, the method has the characteristic of avoiding liquid impact phenomenon, along with high operation stability and safety.
Description
Technical field
The present invention relates to air-conditioning control field, specifically be meant a kind of control method that prevents combined air conditioners screw compressor generation liquid hammer.
Background technology
The combined air conditioners of prior art is meant the basic module that adopts different abilities, be combined into the off-premises station (8HP is to 64HP) of different abilities according to the payload of air-conditioned room, or the off-premises station of a little number drags many indoor sets.The former application scenario is the large commercial occasion, and latter application scenario is the domestic type occasion.This type combined air conditioners indoor set configuration electric expansion valve carries out throttling; During refrigeration mode, because fault or indoor environment temperature when shutting down to temperature, the previous indoor set electronic expansion valve opening of opening was closed to for zero step earlier when indoor set; Then reached for 200 steps again, be in holding state; And previous indoor set of shutting down, its electronic expansion valve opening was opened to for 200 steps by zero step, also was in holding state.
But at present; For the multi-gang air conditioner of screw compressor; In order to adapt to the versatility that indoor set comprises indoor set equipment itself and indoor electric-control system, the control method that the indoor set of the combined air conditioners of use screw compressor is directly used above-mentioned existing common combined air conditioners.Just there are the following problems for this.
Use the multi-gang air conditioner of screw compressor, the off-premises station ability can reach hundreds of, makes filling quantity of refrigerant big especially, even can reach several tons refrigerant amount.So when air-conditioning system is shut down in the inoperative period for a long time; And indoor electric expansion valve is in opening; Cause the pressure of air-conditioning system high-pressure side and low-pressure side balance to occur, make cold-producing medium be full of high-pressure side and low-pressure side, and make original high-pressure side liquid refrigerant get into low-pressure side; When needs are started shooting,, must cause a large amount of liquid refrigerants to get in the compression chamber through muffler because there are a large amount of liquid refrigerants in low-pressure side; Formation hydraulic pressure contracts, and makes cold-producing medium boiling in the lubricating oil to produce the oil pressure liquid hammer and bring lubricating oil into compression chamber; It is liquid hit phenomenon; And the damage compressor drum finally causes the air-conditioning system paralysis, so operation stability and security are all relatively poor.
Summary of the invention
The present invention is directed to above problem a kind of control method that liquid hit phenomenon and operation stability and security all prevent combined air conditioners screw compressor generation liquid hammer preferably that can not occur is provided.
The present invention overcomes the above problems used technical scheme: a kind of control method that prevents combined air conditioners screw compressor generation liquid hammer is provided,
(1) is in when powering on holding state when the air-conditioning unit; Total liquid supply electromagnetic valve on total feed pipe is in closed condition; Liquid supply electromagnetic valve on each indoor set feed pipe is in closed condition; Oil return solenoid valve on the oil return pipe is in closed condition, and the hydrojet magnetic valve on the sparge pipe also is in closed condition, and the electronic expansion valve opening of each indoor set was zero step;
(2) before the air-conditioning unit is opened; Oil heater in the helical-lobe compressor oil sump is in the unlatching heated condition always, and when helical-lobe compressor oil sump oil temperature reached setting oil temperature, the total liquid supply electromagnetic valve on total feed pipe was opened; Receive that the liquid supply electromagnetic valve on the indoor set feed pipe of start-up command opens; The electric expansion valve of this indoor set is also opened, and the aperture of electric expansion valve was 100 ~ 150 steps, the operation of helical-lobe compressor start subsequently; After the helical-lobe compressor start, behind 25% load running, 20 ~ 30s, change 50% load running, 180 ~ 300s over to earlier, change 75% load running, 180 ~ 300s again over to, at 100% load running, 180 ~ 300s, control automatically according to the indoor load situation afterwards at last;
(3) when the indoor set total load is in part load condition, the magnetic valve on the gas-liquid separator oil return pipe is opened; The high-pressure side is stored in the high pressure fluid reservoir greater than the liquid refrigerant of helical-lobe compressor discharge capacity; The aperture of the indoor set electric expansion valve of this moment start is that the degree of superheat is regulated according to the difference of indoor evaporator outlet temperature and inlet temperature, makes the degree of superheat of the cold-producing medium that evaporimeter comes out remain on 0～5 ℃;
(4) when certain indoor set arrived design temperature shutdown or disorderly closedown owing to indoor environment temperature, the liquid supply electromagnetic valve on the corresponding feed pipe was closed, and corresponding electric expansion valve is closed to the zero step subsequently;
(5) after the indoor environment temperature of all indoor sets arrived design temperature, all indoor sets were shut down, and at this moment, the total liquid supply electromagnetic valve on total feed pipe is closed, the closed electromagnetic valve on all indoor set feed pipes, and corresponding electric expansion valve was closed to for zero step subsequently; After all indoor set electric expansion valves were closed to for zero step, helical-lobe compressor was shut down.
After adopting above method, compared with prior art, the present invention is because when standby or indoor set shutdown; Total liquid supply electromagnetic valve and liquid supply electromagnetic valve all are in closed condition, and electronic expansion valve opening was zero step, during the indoor set start; Electronic expansion valve opening is less, to reduce the capacity of returns of low-pressure side liquid refrigerant, guarantees through behind the gas-liquid separator; The cold-producing medium of getting back to the compressor return air mouth is a gaseous refrigerant, thereby prevents the generation of liquid hit phenomenon; Before helical-lobe compressor was opened simultaneously, oil heater was being worked always, then can abundant being evaporated of the cold-producing medium that dissolve in the lubricating oil be prevented that compressor start back is owing to liquid hit phenomenon takes place in cold-producing medium boiling in the lubricating oil; Moreover helical-lobe compressor can be avoided liquid refrigerant eliminating in the gas-liquid separator compression chamber of liquid refrigerant entering helical-lobe compressor and liquid hit phenomenon is taken place in each load running certain time length.Therefore no matter be start the last stage, the startup stage, control stage or the present invention of shutdown stage can both guarantee that the cold-producing medium that flows in the helical-lobe compressor muffler all is in gaseous state automatically; Can prevent the liquid hit phenomenon that causes because of cold-producing medium boiling effectively, and have all characteristics preferably of operation stability and security.
As improvement; The oily temperature of described setting be meant oil sump oil temperature greater than 20 ℃ or oil sump oil temperature greater than 20 ℃ of environment temperatures; Then can guarantee the cold-producing medium in the lubricating oil can be evaporated fully; Prevent cold-producing medium get into the compression chamber of helical-lobe compressor with lubricating oil after boiling liquid hit phenomenon takes place, it is stable more to make that the present invention moves, security is better.
As further improvement, after the described helical-lobe compressor start, earlier behind 25% load running 30s; Change 50% load running 240s over to, change 75% load running 240s again over to, at last at 100% load running 240s; Automatically control according to the indoor load situation afterwards, when then liquid refrigerant is got rid of in gas-liquid separator, take into account the energy consumption of helical-lobe compressor operation; Make the present invention under stability and security reliable premise, energy consumption is lower.
The aperture of described electric expansion valve was 120 steps.
The degree of superheat of described cold-producing medium remains on 1～3 ℃.
Description of drawings
Accompanying drawing prevents the systematic schematic diagram of the control method of combined air conditioners screw compressor generation liquid hammer for the present invention.
As shown in the figure: 1, helical-lobe compressor, 2, oil heater, 3, oil return pipe, 3.1, oil return solenoid valve; 4, gs-oil separator, 5, total feed pipe, 5.1, total liquid supply electromagnetic valve, 6, the high pressure reservoir; 7, indoor set, 7.1, electric expansion valve, 7.2, liquid supply electromagnetic valve, 8, gas-liquid separator; 9, gas-liquid separator oil return pipe, 9.1, magnetic valve, 10, sparge pipe, 10.1, the hydrojet magnetic valve.
The specific embodiment
Below in conjunction with the specific embodiment, the present invention is done an into pulse describe.
Shown in accompanying drawing; Screw compressor combined air conditioners of the present invention comprise off-premises station and Duo Lian indoor set; Described off-premises station comprises three helical-lobe compressors 1, gs-oil separator 4, high pressure reservoir 6 and gas-liquid separator 8; Being provided with balance pipe between the oil sump of described three helical-lobe compressors 1 connects; Branch is installed between gs-oil separator 4 bottoms and the compressor return air pipe is clipped to the oil return pipe 3 and the oil return solenoid valve 3.1 of compressor return air pipe separately, be used for the lubricating oil of gs-oil separator 4 bottoms is delivered to the compressor return air pipe; Gas-liquid separator oil return pipe 9 and the magnetic valve 9.1 of getting back to the total muffler of compressor are installed between gas-liquid separator 8 bottoms and the compressor return air pipe; On total feed pipe 5 total liquid supply electromagnetic valve 5.1 is installed, closes total feed pipe 5 when being used to shut down, stop feed flow; Liquid supply electromagnetic valve 7.2 and electric expansion valve 7.1 are installed on the feed pipe of indoor set 7.
A kind of control method that prevents combined air conditioners screw compressor generation liquid hammer, it may further comprise the steps.
(1) is in when powering on holding state when the air-conditioning unit; Total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is in closed condition; Liquid supply electromagnetic valve 7.2 on each indoor set 7 feed pipe is in closed condition; Oil return solenoid valve 3.1 on the oil return pipe 3 on the gs-oil separator 4 is in closed condition, and the hydrojet magnetic valve 10.1 on the sparge pipe 10 also is in closed condition, and electric expansion valve 7.1 apertures of each indoor set 7 were zero step;
(2) before the air-conditioning unit is opened; Oil heater 2 in helical-lobe compressor 1 oil sump is in the unlatching heated condition always, when helical-lobe compressor 1 oil sump oil temperature reaches when setting the oil temperature, set oily temperature be meant oil sump oil temperature greater than 20 ℃ or oil sump oil temperature greater than 20 ℃ of environment temperatures; The cold-producing medium that dissolves in the lubricating oil is evaporated; Prevent to start shooting the back because the boiling of cold-producing medium in the lubricating oil produces the oil pressure liquid hammer and bring lubricating oil into compression chamber, damage the compression screw rod; Total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is opened; Receive that the liquid supply electromagnetic valve 7.2 on indoor set 7 feed pipes of start-up command opens; The electric expansion valve 7.2 of this indoor set 7 is also opened, and the aperture of electric expansion valve 7.2 was 100 steps, helical-lobe compressor 1 start operation subsequently; After helical-lobe compressor 1 start, behind 25% load running 30s, change 50% load running 180s over to earlier; Change 75% load running 180s again over to; At 100% load running 180s, control automatically based on the indoor load situation afterwards at last, control is undertaken by the conventional method of prior art automatically;
(3) when indoor set 7 total loads are in part load condition, the magnetic valve 9.1 on the gas-liquid separator oil return pipe 9 is opened and since pipe-line system in refrigerant flow greater than helical-lobe compressor 1 discharge capacity; The amount of liquid refrigerant of being carried secretly by return-air increases; When this part liquid refrigerant gets into gas-liquid separator 8, in gas-liquid separator 8, from gaseous refrigerant, separate, stockpile in the bottom; Along with the operation of system, this part liquid refrigerant also can flash to gaseous refrigerant and get into muffler afterwards; The high-pressure side is stored in the high pressure reservoir 6 greater than the liquid refrigerant of helical-lobe compressor 1 discharge capacity; The aperture of indoor set 7 electric expansion valves 7.1 of start this moment is that the degree of superheat is regulated according to the difference of indoor evaporator outlet temperature and inlet temperature; Make the degree of superheat of the cold-producing medium that evaporimeter comes out remain on 0.5 ℃; The assurance evaporator evaporation is complete, and forms gaseous refrigerant;
(4) when certain indoor set 7 because indoor environment temperature arrives and shuts down behind the design temperature or during disorderly closedown, the liquid supply electromagnetic valve 7.2 on the corresponding feed pipe is closed, corresponding electric expansion valve 7.1 was closed to for zero step subsequently;
(5) after the indoor environment temperature of all indoor sets 7 arrives design temperature; All indoor sets 7 are shut down, and at this moment, the total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is closed; Liquid supply electromagnetic valve 7.2 on all indoor set 7 feed pipes is closed, and corresponding electric expansion valve 7.1 was closed to for zero step subsequently; After all indoor set 7 electric expansion valves 7.1 were closed to for zero step, helical-lobe compressor 1 was shut down.
A kind of control method that prevents combined air conditioners screw compressor generation liquid hammer, it may further comprise the steps.
(1) is in when powering on holding state when the air-conditioning unit; Total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is in closed condition; Liquid supply electromagnetic valve 7.2 on each indoor set 7 feed pipe is in closed condition; Oil return solenoid valve 3.1 on the oil return pipe 3 on the gs-oil separator 4 is in closed condition, and the hydrojet magnetic valve 10.1 on the sparge pipe 10 also is in closed condition, and electric expansion valve 7.1 apertures of each indoor set 7 were zero step;
(2) before the air-conditioning unit is opened; Oil heater 2 in helical-lobe compressor 1 oil sump is in the unlatching heated condition always, when helical-lobe compressor 1 oil sump oil temperature reaches when setting the oil temperature, set oily temperature be meant oil sump oil temperature greater than 20 ℃ or oil sump oil temperature greater than 20 ℃ of environment temperatures; The cold-producing medium that dissolves in the lubricating oil is evaporated; Prevent to start shooting the back because the boiling of cold-producing medium in the lubricating oil produces the oil pressure liquid hammer and bring lubricating oil into compression chamber, damage the compression screw rod; Total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is opened; Receive that the liquid supply electromagnetic valve 7.2 on indoor set 7 feed pipes of start-up command opens; The electric expansion valve 7.2 of this indoor set 7 is also opened, and the aperture of electric expansion valve 7.2 was 120 steps, helical-lobe compressor 1 start operation subsequently; After helical-lobe compressor 1 start, behind 25% load running 30s, change 50% load running 240s over to earlier, change 75% load running 240s again over to, at 100% load running 240s, control automatically according to the indoor load situation afterwards at last;
(3) when indoor set 7 total loads are in part load condition, the magnetic valve 9.1 on the gas-liquid separator oil return pipe 9 is opened and since pipe-line system in refrigerant flow greater than helical-lobe compressor 1 discharge capacity; The amount of liquid refrigerant of being carried secretly by return-air increases; When this part liquid refrigerant gets into gas-liquid separator 8, in gas-liquid separator 8, from gaseous refrigerant, separate, stockpile in the bottom; Along with the operation of system, this part liquid refrigerant also can flash to gaseous refrigerant and get into muffler afterwards; The high-pressure side is stored in the high pressure reservoir 6 greater than the liquid refrigerant of helical-lobe compressor 1 discharge capacity; The aperture of indoor set 7 electric expansion valves 7.1 of start this moment is that the degree of superheat is regulated according to the difference of indoor evaporator outlet temperature and inlet temperature; Make the degree of superheat of the cold-producing medium that evaporimeter comes out remain on 1 ℃ or 2 ℃; The assurance evaporator evaporation is complete, and forms gaseous refrigerant;
(4) when certain indoor set 7 because indoor environment temperature arrives and shuts down behind the design temperature or during disorderly closedown, the liquid supply electromagnetic valve 7.2 on the corresponding feed pipe is closed, corresponding electric expansion valve 7.1 was closed to for zero step subsequently;
(5) after the indoor environment temperature of all indoor sets 7 arrives design temperature; All indoor sets 7 are shut down, and at this moment, the total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is closed; Liquid supply electromagnetic valve 7.2 on all indoor set 7 feed pipes is closed, and corresponding electric expansion valve 7.1 was closed to for zero step subsequently; After all indoor set 7 electric expansion valves 7.1 were closed to for zero step, helical-lobe compressor 1 was shut down.
Embodiment 3
A kind of control method that prevents combined air conditioners screw compressor generation liquid hammer, it may further comprise the steps.
(1) is in when powering on holding state when the air-conditioning unit; Total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is in closed condition; Liquid supply electromagnetic valve 7.2 on each indoor set 7 feed pipe is in closed condition; Oil return solenoid valve 3.1 on the oil return pipe 3 on the gs-oil separator 4 is in closed condition, and the hydrojet magnetic valve 10.1 on the sparge pipe 10 also is in closed condition, and electric expansion valve 7.1 apertures of each indoor set 7 were zero step;
(2) before the air-conditioning unit is opened; Oil heater 2 in helical-lobe compressor 1 oil sump is in the unlatching heated condition always, when helical-lobe compressor 1 oil sump oil temperature reaches when setting the oil temperature, set oily temperature be meant oil sump oil temperature greater than 20 ℃ or oil sump oil temperature greater than 20 ℃ of environment temperatures; The cold-producing medium that dissolves in the lubricating oil is evaporated; Prevent to start shooting the back because the boiling of cold-producing medium in the lubricating oil produces the oil pressure liquid hammer and bring lubricating oil into compression chamber, damage the compression screw rod; Total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is opened; Receive that the liquid supply electromagnetic valve 7.2 on indoor set 7 feed pipes of start-up command opens; The electric expansion valve 7.2 of this indoor set 7 is also opened, and the aperture of electric expansion valve 7.2 was 150 steps, helical-lobe compressor 1 start operation subsequently; After helical-lobe compressor 1 start, behind 25% load running 20s, change 50% load running 300s over to earlier, change 75% load running 300s again over to, at 100% load running 300s, control automatically according to the indoor load situation afterwards at last;
(3) when indoor set 7 total loads are in part load condition, the magnetic valve 9.1 on the gas-liquid separator oil return pipe 9 is opened and since pipe-line system in refrigerant flow greater than helical-lobe compressor 1 discharge capacity; The amount of liquid refrigerant of being carried secretly by return-air increases; When this part liquid refrigerant gets into gas-liquid separator 8, in gas-liquid separator 8, from gaseous refrigerant, separate, stockpile in the bottom; Along with the operation of system, this part liquid refrigerant also can flash to gaseous refrigerant and get into muffler afterwards; The high-pressure side is stored in the high pressure reservoir 6 greater than the liquid refrigerant of helical-lobe compressor 1 discharge capacity; The aperture of indoor set 7 electric expansion valves 7.1 of start this moment is that the degree of superheat is regulated according to the difference of indoor evaporator outlet temperature and inlet temperature; Make the degree of superheat of the cold-producing medium that evaporimeter comes out remain on 3 ℃ or 5 ℃; The assurance evaporator evaporation is complete, and forms gaseous refrigerant;
(4) when certain indoor set 7 because indoor environment temperature arrives and shuts down behind the design temperature or during disorderly closedown, the liquid supply electromagnetic valve 7.2 on the corresponding feed pipe is closed, corresponding electric expansion valve 7.1 was closed to for zero step subsequently;
(5) after the indoor environment temperature of all indoor sets 7 arrives design temperature; All indoor sets 7 are shut down, and at this moment, the total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is closed; Liquid supply electromagnetic valve 7.2 on all indoor set 7 feed pipes is closed, and corresponding electric expansion valve 7.1 was closed to for zero step subsequently; After all indoor set 7 electric expansion valves 7.1 were closed to for zero step, helical-lobe compressor 1 was shut down.
Embodiment 4
A kind of control method that prevents combined air conditioners screw compressor generation liquid hammer, it may further comprise the steps.
(1) is in when powering on holding state when the air-conditioning unit; Total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is in closed condition; Liquid supply electromagnetic valve 7.2 on each indoor set 7 feed pipe is in closed condition; Oil return solenoid valve 3.1 on the oil return pipe 3 on the gs-oil separator 4 is in closed condition, and the hydrojet magnetic valve 10.1 on the sparge pipe 10 also is in closed condition, and electric expansion valve 7.1 apertures of each indoor set 7 were zero step;
(2) before the air-conditioning unit is opened; Oil heater 2 in helical-lobe compressor 1 oil sump is in the unlatching heated condition always, when helical-lobe compressor 1 oil sump oil temperature reaches when setting the oil temperature, set oily temperature be meant oil sump oil temperature greater than 20 ℃ or oil sump oil temperature greater than 20 ℃ of environment temperatures; The cold-producing medium that dissolves in the lubricating oil is evaporated; Prevent to start shooting the back because the boiling of cold-producing medium in the lubricating oil produces the oil pressure liquid hammer and bring lubricating oil into compression chamber, damage the compression screw rod; Total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is opened; Receive that the liquid supply electromagnetic valve 7.2 on indoor set 7 feed pipes of start-up command opens; The electric expansion valve 7.2 of this indoor set 7 is also opened, and the aperture of electric expansion valve 7.2 was 120 steps, helical-lobe compressor 1 start operation subsequently; After helical-lobe compressor 1 start, behind 25% load running 25s, change 50% load running 240s over to earlier, change 75% load running 240s again over to, at 100% load running 240s, control automatically according to the indoor load situation afterwards at last;
(3) when indoor set 7 total loads are in part load condition, the magnetic valve 9.1 on the gas-liquid separator oil return pipe 9 is opened and since pipe-line system in refrigerant flow greater than helical-lobe compressor 1 discharge capacity; The amount of liquid refrigerant of being carried secretly by return-air increases; When this part liquid refrigerant gets into gas-liquid separator 8, in gas-liquid separator 8, from gaseous refrigerant, separate, stockpile in the bottom; Along with the operation of system, this part liquid refrigerant also can flash to gaseous refrigerant and get into muffler afterwards; The high-pressure side is stored in the high pressure reservoir 6 greater than the liquid refrigerant of helical-lobe compressor 1 discharge capacity; The aperture of indoor set 7 electric expansion valves 7.1 of start this moment is that the degree of superheat is regulated according to the difference of indoor evaporator outlet temperature and inlet temperature; Make the degree of superheat of the cold-producing medium that evaporimeter comes out remain on 2 ℃; The assurance evaporator evaporation is complete, and forms gaseous refrigerant;
(4) when certain indoor set 7 because indoor environment temperature arrives and shuts down behind the design temperature or during disorderly closedown, the liquid supply electromagnetic valve 7.2 on the corresponding feed pipe is closed, corresponding electric expansion valve 7.1 was closed to for zero step subsequently;
(5) after the indoor environment temperature of all indoor sets 7 arrives design temperature; All indoor sets 7 are shut down, and at this moment, the total liquid supply electromagnetic valve 5.1 on total feed pipe 5 is closed; Liquid supply electromagnetic valve 7.2 on all indoor set 7 feed pipes is closed, and corresponding electric expansion valve 7.1 was closed to for zero step subsequently; After all indoor set 7 electric expansion valves 7.1 were closed to for zero step, helical-lobe compressor 1 was shut down.
Above embodiment is merely preferred embodiment of the present invention, and the present invention is not limited only to above embodiment and also allows other structural change, allly in rights to independence claimed range of the present invention, changes, and all belongs to protection domain of the present invention.
Claims (5)
1. control method that prevents combined air conditioners screw compressor generation liquid hammer is characterized in that:
(1) is in when powering on holding state when the air-conditioning unit; Total liquid supply electromagnetic valve on total feed pipe is in closed condition; Liquid supply electromagnetic valve on each indoor set feed pipe is in closed condition; Oil return solenoid valve on the oil return pipe is in closed condition, and the hydrojet magnetic valve on the sparge pipe also is in closed condition, and the electronic expansion valve opening of each indoor set was zero step;
(2) before the air-conditioning unit is opened; Oil heater in the helical-lobe compressor oil sump is in the unlatching heated condition always, and when helical-lobe compressor oil sump oil temperature reached setting oil temperature, the total liquid supply electromagnetic valve on total feed pipe was opened; Receive that the liquid supply electromagnetic valve on the indoor set feed pipe of start-up command opens; The electric expansion valve of this indoor set is also opened, and the aperture of electric expansion valve was 100 ~ 150 steps, the operation of helical-lobe compressor start subsequently; After the helical-lobe compressor start, behind 25% load running, 20 ~ 30s, change 50% load running, 180 ~ 300s over to earlier, change 75% load running, 180 ~ 300s again over to, at 100% load running, 180 ~ 300s, control automatically according to the indoor load situation afterwards at last;
(3) when the indoor set total load is in part load condition, the magnetic valve on the gas-liquid separator oil return pipe is opened; The high-pressure side is stored in the high pressure fluid reservoir greater than the liquid refrigerant of helical-lobe compressor discharge capacity; The aperture of the indoor set electric expansion valve of this moment start is that the degree of superheat is regulated according to the difference of indoor evaporator outlet temperature and inlet temperature, makes the degree of superheat of the cold-producing medium that evaporimeter comes out remain on 0～5 ℃;
(4) when certain indoor set arrived design temperature shutdown or disorderly closedown owing to indoor environment temperature, the liquid supply electromagnetic valve on the corresponding feed pipe was closed, and corresponding electric expansion valve is closed to the zero step subsequently;
(5) after the indoor environment temperature of all indoor sets arrived design temperature, all indoor sets were shut down, and at this moment, the total liquid supply electromagnetic valve on total feed pipe is closed, the closed electromagnetic valve on all indoor set feed pipes, and corresponding electric expansion valve was closed to for zero step subsequently; After all indoor set electric expansion valves were closed to for zero step, helical-lobe compressor was shut down.
2. the control method that prevents combined air conditioners screw compressor generation liquid hammer according to claim 1 is characterized in that: the aperture of described electric expansion valve was 120 steps.
3. the control method that prevents combined air conditioners screw compressor generation liquid hammer according to claim 1 is characterized in that: the oily temperature of described setting be meant oil sump oil temperature greater than 20 ℃ or oil sump oil temperature greater than 20 ℃ of environment temperatures.
4. the control method that prevents combined air conditioners screw compressor generation liquid hammer according to claim 1; It is characterized in that: after the described helical-lobe compressor start; Behind 25% load running 30s, change 50% load running 240s over to earlier, change 75% load running 240s again over to; At 100% load running 240s, control automatically according to the indoor load situation afterwards at last.
5. the control method that prevents combined air conditioners screw compressor generation liquid hammer according to claim 1 is characterized in that: the degree of superheat of described cold-producing medium remains on 1～3 ℃.
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| CN110173797A (en) * | 2019-05-29 | 2019-08-27 | 南京天加环境科技有限公司 | A kind of air conditioner and its control method for capableing of anti-non-return liquid |
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| CN105466095A (en) * | 2016-01-25 | 2016-04-06 | 珠海格力电器股份有限公司 | Electrical heating control method, device and system for low-temperature refrigerating air conditioning unit |
| CN105466095B (en) * | 2016-01-25 | 2018-04-20 | 珠海格力电器股份有限公司 | Low-temperature refrigeration air conditioner unit electric heating controlling method, device and system |
| CN105890064A (en) * | 2016-06-06 | 2016-08-24 | 合肥天鹅制冷科技有限公司 | Device to reduce noise produced by restarting of air conditioner compressor |
| CN106766420A (en) * | 2016-11-28 | 2017-05-31 | 广东美的暖通设备有限公司 | Multiple on-line system and its control method for heating the anti-hydrops of interior machine |
| CN106766420B (en) * | 2016-11-28 | 2019-10-01 | 广东美的暖通设备有限公司 | Multi-line system and its heating in the anti-hydrops of machine control method |
| CN107965937A (en) * | 2017-11-17 | 2018-04-27 | 珠海格力电器股份有限公司 | A kind of refrigeration unit and its evacuation halt control method |
| CN107965937B (en) * | 2017-11-17 | 2019-07-16 | 珠海格力电器股份有限公司 | A kind of refrigeration unit and its evacuate halt control method |
| US11085661B2 (en) | 2017-12-08 | 2021-08-10 | Danfoss (Tianjin) Ltd. | Fluid injection control system and fluid circulation system |
| US11486621B2 (en) | 2017-12-08 | 2022-11-01 | Danfoss (Tianjin) Ltd. | Controller and method for compressor, compressor assembly and refrigeration system |
| CN110173797A (en) * | 2019-05-29 | 2019-08-27 | 南京天加环境科技有限公司 | A kind of air conditioner and its control method for capableing of anti-non-return liquid |
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| CN102331124B (en) | 2013-06-26 |
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Address after: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee after: NINGBO AUX ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before: Ningbo AUX Electric Co., Ltd. |