CN105546736B - The method for solving the indoor heat exchanger hydrops of multi-connected machine during heating - Google Patents

The method for solving the indoor heat exchanger hydrops of multi-connected machine during heating Download PDF

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Publication number
CN105546736B
CN105546736B CN201510980607.5A CN201510980607A CN105546736B CN 105546736 B CN105546736 B CN 105546736B CN 201510980607 A CN201510980607 A CN 201510980607A CN 105546736 B CN105546736 B CN 105546736B
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Prior art keywords
indoor unit
booting
indoor
pressure
hydrops
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CN201510980607.5A
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CN105546736A (en
Inventor
侯丽峰
涂虬
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00Control inputs relating to system states
    • F24F2140/20Heat-exchange fluid temperature
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a kind of method of the indoor heat exchanger hydrops of multi-connected machine during solution heating, the key of this method is:The indoor unit of each booting is detected one by one, judge every indoor unit being switched on whether and meanwhile meet following two conditions:1st, the coil inlet temperature Te1 of the indoor unit of booting subtracts the Coil outlet temperature Te2 of the indoor unit of the booting more than or equal to 30 DEG C;2nd, the coil pipe middle portion temperature Tem of the indoor unit of booting subtracts the Coil outlet temperature Te2 of the indoor unit of the booting more than or equal to 10 DEG C;If meeting above-mentioned condition simultaneously, hydrops inside the indoor unit of the booting is judged;The rotating speed of the indoor fan (1) of the indoor unit of hydrops is lowered to 1/3rd of indoor fan (1) maximum (top) speed, if pressure at expulsion further drops to 2.8Mpa, the indoor fan (1) of the indoor unit is restored to rated speed.This method is efficient and convenient.

Description

The method for solving the indoor heat exchanger hydrops of multi-connected machine during heating
Technical field
The present invention relates to VRF Air Conditioning Systems, are especially a kind of indoor heat exchanger hydrops for solving multi-connected machine during heating Method.
Background technology
The VRF Air Conditioning System abbreviation multi-connected machine of the prior art, it includes outdoor unit and multiple indoor units parallel with one another And two refrigerants circulation manifold of each indoor unit of connection and outdoor unit.Outdoor unit by two refrigerants circulate manifold with it is in parallel after Multiple indoor units connection.
Outdoor unit includes compressor, oil eliminator, four-way reversing valve, outdoor heat exchanger and (is heated during refrigeration for condenser When be evaporator), outer machine electric expansion valve, liquid storage device and gas-liquid separator.Compressor outlet is connected with the entrance of oil eliminator, The outlet of oil eliminator is connected with the first valve port of four-way reversing valve, and the second valve port of four-way reversing valve connects with outdoor heat exchanger one end Logical, the outdoor heat exchanger other end is connected with one end of outer machine electric expansion valve, the other end and liquid storage device of outer machine electric expansion valve One end connection, circulate with two refrigerants in manifold one of the other end of liquid storage device connects, and two refrigerants circulate in manifold Another refrigerant circulation manifold connected with the four-way reversing valve third valve port of outdoor unit, the 4th valve port of four-way reversing valve and gas-liquid The entrance connection of separator, the outlet of gas-liquid separator is connected with suction port of compressor.
It (is condensation when being heated during refrigeration for evaporator that each indoor unit, which includes interior machine electric expansion valve and indoor heat exchanger, Device), one end of indoor heat exchanger is connected with one end of interior machine electric expansion valve, the other end of interior machine electric expansion valve and two it is cold One in matchmaker's circulation manifold connects, and another refrigerant in the other end of indoor heat exchanger and two refrigerants circulation manifold circulates Manifold is connected.
During heating mode, the first valve port of four-way reversing valve is connected with third valve port, and the second valve port is connected with the 4th valve port, Refrigerant is along compressor, indoor heat exchanger, outdoor heat exchanger, compressor this route cycle.
The factors such as model, exchange capability of heat, fan operation rotating speed, the heating needs of multiple indoor units due to unit parallel connection It differs, in this way, in actual motion, tends to the shape for the hypervolia of refrigerant after the indoor unit heat exchange of booting occur Condition, and the liquid storage device of the prior art can get up the extra refrigerant deposit in this part;But with air-conditioning market competition increasingly Fieriness, producer is to cost control to the degree haggled over every penny, and in order to reduce cost, many producers directly eliminate liquid storage Device, in this way, when liquid refrigerants is excessive in system, to prevent liquid hammer compressor, the aperture of outer machine electric expansion valve can only turn down, this Sample, this operative liquid refrigerant will inversely be accumulated along pipeline, in the indoor heat exchanger for finally slowly accumulating indoor unit, that is, gone out Existing indoor heat exchanger hydrops, once the situation occurs, can cause refrigerant flow rate slow, and indoor unit heating effect is deteriorated or even pressure Report high voltage fault in contracting machine exit.The method that prior art shortage can quickly and easily solve indoor heat exchanger hydrops.
Invention content
The technical problem to be solved by the present invention is to, provide it is a kind of can quickly and easily solve heating when multi-connected machine interior change The method of hot device hydrops.
The technical solution of the present invention is to provide a kind of side for solving the indoor heat exchanger hydrops of multi-connected machine during heating Method is as follows:
A, it is run under heating mode;
If indoor unit is all switched on, judge whether to meet following two conditions simultaneously:1st, the corresponding saturation of pressure at expulsion Temperature is in the range of 50 DEG C~53 DEG C;2nd, the coil pipe middle portion temperature Tem of the indoor unit of booting is in the range of 40 DEG C~43 DEG C; If met simultaneously, then b is entered step, if asynchronously met, exits judgement;
If indoor unit part is switched on, judge whether to meet following three conditions simultaneously:1st, the corresponding saturation of pressure at expulsion Temperature is in the range of 50 DEG C~53 DEG C;2nd, the coil pipe middle portion temperature Tem of the indoor unit of booting is in the range of 40 DEG C~43 DEG C; 3rd, the coil pipe middle portion temperature Tem for the indoor unit being not keyed up is in the range of 45 DEG C~48 DEG C;If met simultaneously, then b is entered step, If asynchronously met, judgement is exited;
B, one by one to each booting indoor unit be detected, judge every booting indoor unit whether and meanwhile satisfaction with Lower two conditions:1st, the coil inlet temperature Te1 of the indoor unit of booting subtracts the Coil outlet temperature Te2 of the indoor unit of the booting More than or equal to 30 DEG C;2nd, the coil pipe middle portion temperature Tem of the indoor unit of booting subtracts the coil outlets temperature of the indoor unit of the booting It spends Te2 and is greater than or equal to 10 DEG C;If meeting above-mentioned condition simultaneously, hydrops inside the indoor unit of the booting is judged;If no Meet simultaneously, then judge not hydrops;
C, the rotating speed of the indoor fan of the indoor unit of hydrops is lowered to 1/3rd of the indoor fan maximum (top) speed, and The pressure at expulsion of monitoring compressor in real time when pressure at expulsion is greater than or equal to 3.7Mpa, then opens the relief valve of compressor, and after Continuous monitoring pressure at expulsion, if pressure at expulsion drops to 3Mpa, the relief valve of close compressor, if pressure at expulsion is further 2.8Mpa is dropped to, then the indoor fan of the indoor unit is restored to rated speed.
The principle of this method is:First, the corresponding saturation temperature of the pressure at expulsion of compressor, the coil pipe middle portion temperature being switched on It is normal, and the coil pipe middle portion temperature the being not keyed up several years more slightly higher than the coil pipe middle portion temperature of booting, at least illustrating compressor just Often work, pipeline does not block substantially, refrigerant can normally reach each indoor heat exchanger, if hydrops in indoor heat exchanger at this time, Refrigerant flow rate then in the coil pipe of indoor heat exchanger is slow, and the wind turbine of each indoor unit is working normally, therefore heat exchange amount is larger, Refrigerant temperature declines very fast when being flowed in indoor heat exchanger, so, once it finds between the import and outlet of the coil pipe of indoor unit The temperature difference and middle part and outlet temperature between excessive temperature differentials, then judge hydrops inside the indoor unit;Once it was found that there is interior The rotation speed of fan of the hydrops indoor unit is just dropped to 1/3rd of maximum (top) speed by machine hydrops, to reduce changing for the indoor unit Heat reduces the liquefaction process of refrigerant, alleviates hydrops, but since gaseous coolant is more, Compressor Discharge Pressure can increase, and work as increase To 3.7Mpa, then relief valve pressure release is opened, and continue to run wind turbine according to 1/3rd rotating speeds, with relief valve pressure release and refrigerant The situation of hydrops constantly improves, and pressure at expulsion also constantly reduces, and then closes relief valve when pressure at expulsion is reduced to 3Mpa, works as row Atmospheric pressure is reduced to 2.8Mpa and then illustrates hydrops situation and solution, and indoor fan is run with rated speed.
Using above method, the present invention solves the method for indoor heat exchanger hydrops of multi-connected machine and the prior art phase during heating Than haing the following advantages:
In this way, hydrops inside the indoor unit can be solved the problems, such as efficiently and easily, the normal operation of air-conditioning ensure that, Solves in industry the technical barrier of objective reality always.
Description of the drawings
Fig. 1 is the systematic schematic diagram that the present invention solves the method for the indoor heat exchanger hydrops of multi-connected machine during heating.
1, indoor fan shown in figure, 2, interior machine electric expansion valve, 3, compressor, 4, indoor heat exchanger.
Specific embodiment
The invention will be further described in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, the method that the present invention solves the indoor heat exchanger hydrops of multi-connected machine during heating, specific steps are such as Under.
A, it is run under heating mode.
First emphasize a concept, indoor unit booting refers to, the indoor fan 1 of indoor unit is switched on, and the interior electromechanics of indoor unit Sub- expansion valve 2 is also opened, and indoor unit shutdown refers to that the indoor fan 1 of indoor unit shuts down, and interior machine electric expansion valve 2 is still just Often open.
If indoor unit is all switched on, judge whether to meet following two conditions simultaneously:1st, the corresponding saturation of pressure at expulsion Temperature is in the range of 50 DEG C~53 DEG C;2nd, the coil pipe middle portion temperature Tem of the indoor unit of booting is in the range of 40 DEG C~43 DEG C; If met simultaneously, then b is entered step, if asynchronously met, exit judgement, and judge not hydrops.In 3 exhaust outlet of compressor As soon as setting pressure sensor can obtain the corresponding saturation temperature of the pressure to measure pressure at expulsion, then by pressure at expulsion.
If indoor unit part is switched on, judge whether to meet following three conditions simultaneously:1st, the corresponding saturation of pressure at expulsion Temperature is in the range of 50 DEG C~53 DEG C;2nd, the coil pipe middle portion temperature Tem of the indoor unit of booting is in the range of 40 DEG C~43 DEG C; 3rd, the coil pipe middle portion temperature Tem for the indoor unit being not keyed up is in the range of 45 DEG C~48 DEG C;If met simultaneously, then b is entered step, If asynchronously met, judgement is exited, and judge not hydrops.
B, one by one to each booting indoor unit be detected, judge every booting indoor unit whether and meanwhile satisfaction with Lower two conditions:1st, the coil inlet temperature Te1 of the indoor unit of booting subtracts the coil outlets of same indoor unit of the booting Temperature Te2 is greater than or equal to 30 DEG C;2nd, the coil pipe middle portion temperature Tem of the indoor unit of booting subtracts same indoor unit of the booting Coil outlet temperature Te2 be greater than or equal to 10 DEG C;If meeting above-mentioned condition simultaneously, judge inside the indoor unit of the booting Hydrops;If asynchronously met, not hydrops is judged.
Three entrance of the coil pipe of the indoor heat exchanger 4 of machine, middle part, outlet setting temperature sensors indoors, with respectively Measure coil inlet temperature Te1, coil pipe middle portion temperature Tem and Coil outlet temperature Te2.
C, the rotating speed of the indoor fan 1 of the indoor unit of hydrops is lowered to 1/3rd of 1 maximum (top) speed of indoor fan, And the pressure at expulsion of compressor 3 is monitored in real time using the pressure sensor of 3 exhaust outlet of compressor, when pressure at expulsion is greater than or equal to 3.7Mpa, then open the relief valve of compressor 3, and continues to monitor pressure at expulsion, if pressure at expulsion drops to 3Mpa, closes The relief valve of compressor 3, will be previously since hydrops reduces rotation speed of fan if pressure at expulsion further drops to 2.8Mpa The indoor fan 1 of indoor unit is restored to rated speed.Rated speed is exactly that indoor fan 1 will meet turn that heating needs are provided Speed, the rotating speed are more than 1/3rd of maximum (top) speed.And relief valve is also the common components of outdoor unit, for connecting compressor 3 High-pressure side and low-pressure side, avoid high voltage fault.

Claims (1)

  1. A kind of 1. method for solving the indoor heat exchanger hydrops of multi-connected machine during heating, it is characterised in that:It is as follows:
    A, it is run under heating mode;
    If indoor unit is all switched on, judge whether to meet following two conditions simultaneously:1), the corresponding saturation temperature of pressure at expulsion In the range of 50 DEG C~53 DEG C;2), the coil pipe middle portion temperature Tem of the indoor unit of booting is in the range of 40 DEG C~43 DEG C;Such as Meet simultaneously, then enter step b, if asynchronously met, exit judgement;
    If indoor unit part is switched on, judge whether to meet following three conditions simultaneously:1), the corresponding saturation temperature of pressure at expulsion In the range of 50 DEG C~53 DEG C;2), the coil pipe middle portion temperature Tem of the indoor unit of booting is in the range of 40 DEG C~43 DEG C;3)、 The coil pipe middle portion temperature Tem for the indoor unit being not keyed up is in the range of 45 DEG C~48 DEG C;If met simultaneously, then b is entered step, such as Meet during fruit difference, then exit judgement;
    B, one by one to each booting indoor unit be detected, judge every booting indoor unit whether simultaneously satisfaction below two A condition:1) the Coil outlet temperature Te2 of indoor unit that, the coil inlet temperature Te1 of the indoor unit of booting subtracts the booting is big In or equal to 30 DEG C;2), the coil pipe middle portion temperature Tem of the indoor unit of booting subtracts the Coil outlet temperature of the indoor unit of the booting Te2 is greater than or equal to 10 DEG C;If meeting above-mentioned condition simultaneously, hydrops inside the indoor unit of the booting is judged;It is if different When meet, then judge not hydrops;
    C, the rotating speed of the indoor fan (1) of the indoor unit of hydrops is lowered to 1/3rd of indoor fan (1) maximum (top) speed, And in real time monitoring compressor (3) pressure at expulsion, when pressure at expulsion be greater than or equal to 3.7Mpa, then open letting out for compressor (3) Pressure valve, and continue to monitor pressure at expulsion, if pressure at expulsion drops to 3Mpa, the relief valve of close compressor (3), if row Atmospheric pressure further drops to 2.8Mpa, then the indoor fan of the indoor unit (1) is restored to rated speed.
CN201510980607.5A 2015-12-23 2015-12-23 The method for solving the indoor heat exchanger hydrops of multi-connected machine during heating Active CN105546736B (en)

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CN106545958B (en) * 2016-10-11 2019-07-26 广东美的暖通设备有限公司 Multi-line system and its insufficient determination method of indoor unit refrigerating capacity
CN106765894B (en) * 2016-11-29 2019-07-26 广东美的暖通设备有限公司 Multi-line system and its coolant quantity determination method
CN111750481A (en) * 2019-03-27 2020-10-09 日立江森自控空调有限公司 Air conditioner control method and air conditioner system

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CN102261719A (en) * 2011-05-25 2011-11-30 宁波奥克斯电气有限公司 Control method for starting heating mode of screw-type compressed multi-connected central air conditioner
CN102914027A (en) * 2012-09-20 2013-02-06 宁波奥克斯电气有限公司 Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit
CN103075774A (en) * 2013-01-09 2013-05-01 合肥天鹅制冷科技有限公司 Combined air handling unit driven by total heat recovery type heat pump
CN103791587A (en) * 2014-01-21 2014-05-14 宁波奥克斯电气有限公司 Method for judging whether resistance values of temperature sensors of multi-union air conditioner of heating mode deviate

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08313125A (en) * 1995-05-23 1996-11-29 Sanyo Electric Co Ltd Abnormally detecting method of pressure sensor and temperature sensor in refrigerating device
JP2004132610A (en) * 2002-10-10 2004-04-30 Mitsubishi Electric Corp Heating system and dwelling house with heating system
CN102261719A (en) * 2011-05-25 2011-11-30 宁波奥克斯电气有限公司 Control method for starting heating mode of screw-type compressed multi-connected central air conditioner
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CN103075774A (en) * 2013-01-09 2013-05-01 合肥天鹅制冷科技有限公司 Combined air handling unit driven by total heat recovery type heat pump
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