CN102331124B - 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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- CN102331124B CN102331124B CN 201110142549 CN201110142549A CN102331124B CN 102331124 B CN102331124 B CN 102331124B CN 201110142549 CN201110142549 CN 201110142549 CN 201110142549 A CN201110142549 A CN 201110142549A CN 102331124 B CN102331124 B CN 102331124B
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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 the air-conditioning control field, specifically refer to a kind of control method that prevents the multi-unit air conditioner screw compressor generating liquid impact.
Background technology
The combined air conditioners of prior art refers to adopt the basic module of 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 class combined air conditioners indoor set configuration electric expansion valve carries out throttling, during refrigeration mode, when indoor set was shut down to temperature due to fault or indoor environment temperature, the previous indoor set electronic expansion valve opening of opening first was closed to for zero step, then reached again for 200 steps, 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, the versatility that comprises indoor set equipment itself and indoor electric-control system in order to adapt to indoor set, 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 large especially, even can reach the refrigerant amount of several tons.So when air-conditioning system during at inoperative rapid lapse of time shut down, and the indoor electronic 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 enter low-pressure side; When needs are started shooting, because there are a large amount of liquid refrigerants in low-pressure side, must cause a large amount of liquid refrigerants to enter in compression chamber by muffler, form hydraulic compression, make cold-producing medium boiling in lubricating oil, 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, therefore operation stability and security are all relatively poor.
Summary of the invention
The present invention is directed to above problem provides a kind of and liquid hit phenomenon and operation stability and security can not occur and all prevent preferably the control method of multi-unit air conditioner screw compressor generating liquid impact.
The present invention overcomes the above problems technical scheme used: a kind of control method that prevents the multi-unit air conditioner screw compressor generating liquid impact is provided,
(1) be 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 oil return pipe is in closed condition, hydrojet magnetic valve on 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, when helical-lobe compressor oil sump oil temperature reaches the setting oil temperature, total liquid supply electromagnetic valve on total feed pipe is 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, first after 25% load running 20 ~ 30s, change 50% load running 180 ~ 300s over to, then change 75% load running 180 ~ 300s over to, at 100% load running 180 ~ 300s, automatically control 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 start this moment 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 evaporimeter cold-producing medium out remain on 0～5 ℃;
(4) when certain indoor set arrived design temperature shutdown or disorderly closedown due to indoor environment temperature, the liquid supply electromagnetic valve on corresponding feed pipe was closed, and corresponding electric expansion valve was closed to for 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 due to when standby or indoor set are shut down, and 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, guarantees through after gas-liquid separator to reduce the capacity of returns of low-pressure side liquid refrigerant for less, the cold-producing medium of getting back to the compressor return air mouth is gaseous refrigerant, thereby prevents the generation of liquid hit phenomenon; Before simultaneously helical-lobe compressor was opened, oil heater work always, can be with abundant being evaporated of the cold-producing medium that dissolves in lubricating oil, prevent after the compressor start generating liquid impact phenomenon because cold-producing medium in lubricating oil seethes with excitement; Moreover helical-lobe compressor is in each load running certain time length, liquid refrigerant in gas-liquid separator can be got rid of, and avoids liquid refrigerant to enter the compression chamber of helical-lobe compressor and the generating liquid impact phenomenon.Therefore no matter be start the last stage, the startup stage, automatically control stage or shutting down stage the present invention can guarantee that the cold-producing medium that flows in the helical-lobe compressor muffler all is in gaseous state; can effectively prevent the liquid hit phenomenon that causes because of cold-producing medium boiling, and have all characteristics preferably of operation stability and security.
As improvement, described setting oil temperature refer to the oil sump oil temperature greater than 20 ℃ or oil sump oil temperature greater than 20 ℃ of environment temperatures, can guarantee the cold-producing medium in lubricating oil can be evaporated fully, prevent that cold-producing medium from entering boiling after the compression chamber of helical-lobe compressor and the generating liquid impact phenomenon with lubricating oil, make the present invention move more stable, security is better.
As further improvement, after described helical-lobe compressor start, first after 25% load running 30s, change 50% load running 240s over to, then change 75% load running 240s over to, at last at 100% load running 240s, automatically control according to the indoor load situation afterwards, when liquid refrigerant is got rid of in gas-liquid separator, take into account the energy consumption of helical-lobe compressor operation, make the utility model under stability and the reliable prerequisite of security, energy consumption is lower.
The aperture of the electric expansion valve in described step (2) was 120 steps.
The degree of superheat of described cold-producing medium remains on 1～3 ℃.
Description of drawings
Accompanying drawing is the systematic schematic diagram that the present invention prevents the control method of multi-unit air conditioner screw compressor generating liquid impact.
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, 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 into a pulse describe.
As shown in drawings, screw compressor combined air conditioners of the present invention comprise off-premises station and multi-joint 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, be equipped with between gs-oil separator 4 bottoms and compressor return air pipe and minute be clipped to 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 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 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 for shutting 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 the multi-unit air conditioner screw compressor generating liquid impact, it comprises the following steps.
(1) be 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 pipes is in closed condition, oil return solenoid valve 3.1 on oil return pipe 3 on gs-oil separator 4 is in closed condition, hydrojet magnetic valve 10.1 on 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 the setting oil temperature, set oil temperature refer to the 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 lubricating oil is evaporated, due to the boiling of cold-producing medium in lubricating oil, produce the oil pressure liquid hammer and bring lubricating oil into compression chamber after preventing from starting shooting, 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, first after 25% load running 30s, change 50% load running 180s over to, change again 75% load running 180s over to, at 100% load running 180s, automatically control according to the indoor load situation afterwards at last, automatically control and undertaken by the conventional method of prior art;
(3) when indoor set 7 total loads are in part load condition, magnetic valve 9.1 on gas-liquid separator oil return pipe 9 is opened, due to refrigerant flow in pipe-line system 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 enters gas-liquid separator 8, separate from gaseous refrigerant in gas-liquid separator 8, stockpile in the bottom, along with the operation of system, this part liquid refrigerant also can flash to gaseous refrigerant and enter muffler afterwards; The high-pressure side is stored in 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 evaporimeter cold-producing medium out remain on 0.5 ℃, the assurance evaporator evaporation is complete, and forms gaseous refrigerant;
(4) shut down when certain indoor set 7 arrives design temperature due to indoor environment temperature after or during disorderly closedown, the liquid supply electromagnetic valve 7.2 on 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 the multi-unit air conditioner screw compressor generating liquid impact, it comprises the following steps.
(1) be 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 pipes is in closed condition, oil return solenoid valve 3.1 on oil return pipe 3 on gs-oil separator 4 is in closed condition, hydrojet magnetic valve 10.1 on 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 the setting oil temperature, set oil temperature refer to the 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 lubricating oil is evaporated, due to the boiling of cold-producing medium in lubricating oil, produce the oil pressure liquid hammer and bring lubricating oil into compression chamber after preventing from starting shooting, 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, first after 25% load running 30s, change 50% load running 240s over to, then change 75% load running 240s over to, at 100% load running 240s, automatically control according to the indoor load situation afterwards at last;
(3) when indoor set 7 total loads are in part load condition, magnetic valve 9.1 on gas-liquid separator oil return pipe 9 is opened, due to refrigerant flow in pipe-line system 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 enters gas-liquid separator 8, separate from gaseous refrigerant in gas-liquid separator 8, stockpile in the bottom, along with the operation of system, this part liquid refrigerant also can flash to gaseous refrigerant and enter muffler afterwards; The high-pressure side is stored in 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 evaporimeter cold-producing medium out remain on 1 ℃ or 2 ℃, the assurance evaporator evaporation is complete, and forms gaseous refrigerant;
(4) shut down when certain indoor set 7 arrives design temperature due to indoor environment temperature after or during disorderly closedown, the liquid supply electromagnetic valve 7.2 on 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 the multi-unit air conditioner screw compressor generating liquid impact, it comprises the following steps.
(1) be 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 pipes is in closed condition, oil return solenoid valve 3.1 on oil return pipe 3 on gs-oil separator 4 is in closed condition, hydrojet magnetic valve 10.1 on 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 the setting oil temperature, set oil temperature refer to the 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 lubricating oil is evaporated, due to the boiling of cold-producing medium in lubricating oil, produce the oil pressure liquid hammer and bring lubricating oil into compression chamber after preventing from starting shooting, 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, first after 25% load running 20s, change 50% load running 300s over to, then change 75% load running 300s over to, at 100% load running 300s, automatically control according to the indoor load situation afterwards at last;
(3) when indoor set 7 total loads are in part load condition, magnetic valve 9.1 on gas-liquid separator oil return pipe 9 is opened, due to refrigerant flow in pipe-line system 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 enters gas-liquid separator 8, separate from gaseous refrigerant in gas-liquid separator 8, stockpile in the bottom, along with the operation of system, this part liquid refrigerant also can flash to gaseous refrigerant and enter muffler afterwards; The high-pressure side is stored in 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 evaporimeter cold-producing medium out remain on 3 ℃ or 5 ℃, the assurance evaporator evaporation is complete, and forms gaseous refrigerant;
(4) shut down when certain indoor set 7 arrives design temperature due to indoor environment temperature after or during disorderly closedown, the liquid supply electromagnetic valve 7.2 on 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 the multi-unit air conditioner screw compressor generating liquid impact, it comprises the following steps.
(1) be 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 pipes is in closed condition, oil return solenoid valve 3.1 on oil return pipe 3 on gs-oil separator 4 is in closed condition, hydrojet magnetic valve 10.1 on 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 the setting oil temperature, set oil temperature refer to the 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 lubricating oil is evaporated, due to the boiling of cold-producing medium in lubricating oil, produce the oil pressure liquid hammer and bring lubricating oil into compression chamber after preventing from starting shooting, 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, first after 25% load running 25s, change 50% load running 240s over to, then change 75% load running 240s over to, at 100% load running 240s, automatically control according to the indoor load situation afterwards at last;
(3) when indoor set 7 total loads are in part load condition, magnetic valve 9.1 on gas-liquid separator oil return pipe 9 is opened, due to refrigerant flow in pipe-line system 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 enters gas-liquid separator 8, separate from gaseous refrigerant in gas-liquid separator 8, stockpile in the bottom, along with the operation of system, this part liquid refrigerant also can flash to gaseous refrigerant and enter muffler afterwards; The high-pressure side is stored in 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 evaporimeter cold-producing medium out remain on 2 ℃, the assurance evaporator evaporation is complete, and forms gaseous refrigerant;
(4) shut down when certain indoor set 7 arrives design temperature due to indoor environment temperature after or during disorderly closedown, the liquid supply electromagnetic valve 7.2 on 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 only preferred embodiment of the present invention, and the present invention is not limited only to above embodiment and has also allowed other structural change, allly changes in rights to independence claimed range of the present invention, all belongs to protection domain of the present invention.
Claims (5)
1. control method that prevents the multi-unit air conditioner screw compressor generating liquid impact is characterized in that:
(1) be 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 oil return pipe is in closed condition, hydrojet magnetic valve on 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, when helical-lobe compressor oil sump oil temperature reaches the setting oil temperature, total liquid supply electromagnetic valve on total feed pipe is 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, first after 25% load running 20 ~ 30s, change 50% load running 180 ~ 300s over to, then change 75% load running 180 ~ 300s over to, at 100% load running 180 ~ 300s, automatically control 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 start this moment 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 evaporimeter cold-producing medium out remain on 0～5 ℃;
(4) when certain indoor set arrived design temperature shutdown or disorderly closedown due to indoor environment temperature, the liquid supply electromagnetic valve on corresponding feed pipe was closed, and corresponding electric expansion valve was closed to for 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 the multi-unit air conditioner screw compressor generating liquid impact according to claim 1 is characterized in that: the aperture of the electric expansion valve in described step (2) was 120 steps.
3. the control method that prevents the multi-unit air conditioner screw compressor generating liquid impact according to claim 1 is characterized in that: described setting oil temperature refer to the oil sump oil temperature greater than 20 ℃ or oil sump oil temperature greater than 20 ℃ of environment temperatures.
4. the control method that prevents the multi-unit air conditioner screw compressor generating liquid impact according to claim 1, it is characterized in that: after described helical-lobe compressor start, first after 25% load running 30s, change 50% load running 240s over to, change again 75% load running 240s over to, at 100% load running 240s, automatically control according to the indoor load situation afterwards at last.
5. the control method that prevents the multi-unit air conditioner screw compressor generating liquid impact according to claim 1, it is characterized in that: the degree of superheat of described cold-producing medium remains on 1～3 ℃.
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| KR100908022B1 (en) * | 2008-12-18 | 2009-07-15 | 주식회사 건영기계 | Method for controlling screw compressor and apparatus thereof |
| CN101539322B (en) * | 2009-03-31 | 2011-06-01 | 宁波奥克斯电气有限公司 | Method for controlling electronic expansion valve of heating standby indoor unit |
| CN101968248B (en) * | 2010-08-26 | 2012-10-17 | 宁波奥克斯电气有限公司 | Control method for oil return of DC inverter compressor |
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