CN104676845A - Multi-split system and control method thereof - Google Patents
Multi-split system and control method thereof Download PDFInfo
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- CN104676845A CN104676845A CN201510138015.9A CN201510138015A CN104676845A CN 104676845 A CN104676845 A CN 104676845A CN 201510138015 A CN201510138015 A CN 201510138015A CN 104676845 A CN104676845 A CN 104676845A
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- compressor
- line system
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- superheat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control 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
- F24F11/84—Control 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method of a multi-split system. The multi-split system comprises an outdoor unit and a plurality of indoor units, wherein each indoor unit comprises an indoor heat exchanger and an electronic expansion valve; the outdoor unit comprises an outdoor heat exchanger, a fourth-way valve, a compressor, a low pressure liquid storage tank and an electromagnetic valve; a first node is arranged between the outdoor heat exchanger and the four-way valve; the electromagnetic valve is connected between the first node and the low pressure liquid storage tank. The control method comprises the following steps: S1, acquiring the return air overheat degree of the compressor; and S2, when the return air overheat degree of the compressor is less than a first preset value and can keep a first predetermined time, adjusting the openness of the electronic expansion valves corresponding to the indoor units of the indoor units in a starting up state so as to prevent a liquid refrigerant from flowing back in the multi-split system. The control method disclosed by the invention can be used for quickly enhancing the return air overheat degree of the compressor so as to reduce the probability of return liquid of the compressor, so that the operating reliability of the system is improved. The invention further discloses the multi-split system.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly a kind of control method of multiple on-line system and a kind of multiple on-line system.
Background technology
Low-pressure liquid storing tank uses widely in air conditioner refrigerating field, and its Main Function is by the gas-liquid separation in muffler, prevents compressor from returning liquid.In multiple on-line system; the charging amount of refrigerant is larger; this will cause the internal volume of the low-pressure liquid storing tank designed also increasing; when system-down; the liquid refrigerants that in low-pressure liquid storing tank, easily storage is a large amount of; during system restart, what in low-pressure oil storage, the refrigerant of gas-liquid two-phase continued for a long time enters compressor, thus can cause compressor injury.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency.
For this reason, one object of the present invention is to propose a kind of control method that can improve the multiple on-line system of system operation reliability.
Another object of the present invention is to propose a kind of multiple on-line system.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of control method of multiple on-line system, wherein, described multiple on-line system comprises off-premises station and multiple indoor set, each described indoor set comprises indoor heat exchanger and electric expansion valve, described off-premises station comprises outdoor heat exchanger, cross valve, compressor, low-pressure liquid storing tank and magnetic valve, between described outdoor heat exchanger and described cross valve, there is first node, described magnetic valve is connected between described first node and described low-pressure liquid storing tank, described control method comprises the following steps: S1, obtain the return-air degree of superheat of described compressor, S2, when the return-air degree of superheat of described compressor is less than the first preset value and continues the first Preset Time, the aperture of electric expansion valve corresponding for the indoor set being in open state in described multiple indoor set is adjusted to first and presets aperture, reflux to prevent the liquid refrigerants in described multiple on-line system.
According to the control method of the multiple on-line system of the embodiment of the present invention, when multiple on-line system is run in a chiller mode, first the return-air degree of superheat of compressor is obtained, then when the return-air degree of superheat of compressor is less than the first preset value and continues the first Preset Time, when namely judging that the return-air degree of superheat of compressor is not enough, the aperture of electric expansion valve corresponding for the indoor set being in open state in multiple indoor set is adjusted to first and presets aperture, the liquid refrigerants of low-pressure liquid storing tank can be discharged fast, the return-air degree of superheat of fast lifting compressor, thus reduce the possibility that compressor returns liquid, substantially increase the reliability of system cloud gray model.
According to one embodiment of present invention, in described step S2, also the running frequency of described compressor is fixed on predeterminated frequency.
According to one embodiment of present invention, described step S1 specifically comprises: the back pressure detecting described compressor, and the suction temperature detecting described compressor; The suction temperature of the saturation temperature corresponding according to the back pressure of described compressor and described compressor calculates the return-air degree of superheat of described compressor.
Further, according to one embodiment of present invention, the control method of described multiple on-line system, also comprise: when the back pressure of described compressor is more than or equal to the first preset pressure and the return-air degree of superheat of described compressor is less than or equal to the second preset value, the aperture of electric expansion valve corresponding for the described indoor set being in open state being maintained described first, to preset aperture constant, and it is constant that the running frequency of described compressor is maintained predeterminated frequency.
Further, the control method of described multiple on-line system, also comprises: if the back pressure of described compressor is less than described first preset pressure, then open described magnetic valve and maintain the second Preset Time; If the return-air degree of superheat of described compressor is greater than described second preset value, then controls described multiple on-line system and recover normal operating condition.
For achieving the above object, a kind of multiple on-line system that the present invention's another aspect embodiment proposes, comprise: off-premises station, described off-premises station comprises outdoor heat exchanger, cross valve, compressor, low-pressure liquid storing tank and magnetic valve, have first node between described outdoor heat exchanger and described cross valve, described magnetic valve is connected between described first node and described low-pressure liquid storing tank; Multiple indoor set, each described indoor set comprises indoor heat exchanger and electric expansion valve; And control module, described control module is for obtaining the return-air degree of superheat of described compressor, and when the return-air degree of superheat of described compressor is less than the first preset value and continues the first Preset Time, the aperture of electric expansion valve corresponding for the indoor set being in open state in described multiple indoor set is adjusted to first and presets aperture by described control module, refluxes to prevent the liquid refrigerants in described multiple on-line system.
According to the multiple on-line system of the embodiment of the present invention, when refrigeration mode runs, the return-air degree of superheat of compressor is obtained by control module, then when the return-air degree of superheat of compressor is less than the first preset value and continues the first Preset Time, when namely judging that the return-air degree of superheat of compressor is not enough, the aperture of electric expansion valve corresponding for the indoor set being in open state in multiple indoor set is adjusted to first and presets aperture by control module, the liquid refrigerants of low-pressure liquid storing tank can be discharged fast, the return-air degree of superheat of fast lifting compressor, thus reduce the possibility that compressor returns liquid, substantially increase the reliability of system cloud gray model.
According to one embodiment of present invention, when the return-air degree of superheat of described compressor is less than described first preset value and continues described first Preset Time, the running frequency of described compressor is also fixed on predeterminated frequency by described control module.
According to one embodiment of present invention, also comprise the first pressure sensor and the first temperature sensor, described first pressure sensor is arranged between described compressor and described low-pressure liquid storing tank, for detecting the back pressure of described compressor, described first temperature sensor is arranged between described compressor and described low-pressure liquid storing tank, for detecting the suction temperature of described compressor, described control module calculates the return-air degree of superheat of described compressor according to the suction temperature of saturation temperature corresponding to the back pressure of described compressor and described compressor.
According to one embodiment of present invention, when the back pressure of described compressor is more than or equal to the first preset pressure and the return-air degree of superheat of described compressor is less than or equal to the second preset value, the aperture of electric expansion valve corresponding for the described indoor set being in open state is maintained described first by described control module, and to preset aperture constant, and it is constant that the running frequency of described compressor is maintained predeterminated frequency.
Wherein, if the back pressure of described compressor is less than described first preset pressure, described control module is then opened described magnetic valve and is maintained the second Preset Time; If the return-air degree of superheat of described compressor is greater than described second preset value, described control module then controls described multiple on-line system and recovers normal operating condition.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the flow chart of the control method of multiple on-line system according to the embodiment of the present invention;
Fig. 2 is the flow chart of the control method of multiple on-line system according to the present invention's specific embodiment; And
Fig. 3 is the structural representation of multiple on-line system according to an embodiment of the invention.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In describing the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
Control method and the multiple on-line system of the multiple on-line system proposed according to the embodiment of the present invention are described with reference to the accompanying drawings.
Fig. 1 is the flow chart of the control method of multiple on-line system according to the embodiment of the present invention.Wherein, this multiple on-line system comprises off-premises station and multiple indoor set, each indoor set comprises indoor heat exchanger and electric expansion valve, off-premises station comprises outdoor heat exchanger, cross valve, compressor, low-pressure liquid storing tank and magnetic valve, and have first node between outdoor heat exchanger and cross valve, magnetic valve is connected between first node and low-pressure liquid storing tank.As shown in Figure 1, the control method of this multiple on-line system comprises the following steps:
S1, obtains the return-air degree of superheat of compressor.
According to one embodiment of present invention, step S1 specifically comprises: the back pressure Pc detecting compressor, and detects the suction temperature Tc of compressor; The suction temperature Tc of the saturation temperature Ts corresponding according to the back pressure Pc of compressor and compressor calculates the return-air degree of superheat SH of compressor, i.e. the return-air degree of superheat SH=Tc-Ts of compressor.
S2, when the return-air degree of superheat of compressor is less than the first preset value and continues the first Preset Time, the aperture of electric expansion valve corresponding for the indoor set being in open state in multiple indoor set is adjusted to first and presets aperture, to prevent the liquid refrigerants in multiple on-line system from refluxing, the possibility that compressor returns liquid can be reduced.
Further, in step s 2, also the running frequency of compressor is fixed on predeterminated frequency.
Wherein, the first preset value requires to determine according to the minimum degree of superheat of compressor, and the first Preset Time is generally in 0 ~ 5 minute, and first presets aperture generally in 0 1/5 scope to the maximum opening of electric expansion valve.
Particularly, according to one embodiment of present invention, as shown in Figure 2, the control method of above-mentioned multiple on-line system comprises the following steps:
S201, multiple on-line system is started shooting operation in a chiller mode.
S202, detects the return-air degree of superheat SH of compressor.Wherein, utilize the first pressure sensor to detect the back pressure Pc of compressor, and utilize the first temperature sensor to detect the suction temperature Tc of compressor, calculate the saturation temperature Ts that Pc is corresponding, calculate the return-air degree of superheat SH=Tc-Ts of compressor.
S203, judges whether return-air degree of superheat SH is less than the first preset value T1.If so, step S204 is performed; If not, step S202 is returned.Wherein, T1 requires to determine according to the minimum degree of superheat of compressor.
S204, judges whether lasting first preset time T i1.If so, step S205 is performed; If not, step S202 is returned.Wherein, Ti1 is generally in 0 ~ 5 minute.
S205, the electric expansion valve of indoor set start run turns down to the first default aperture A (A is generally in the scope of 0 ~ maximum opening value/5), makes indoor set be in larger degree of superheat state, refluxes to prevent liquid refrigerants.Meanwhile, the running frequency of compressor is fixed on predeterminated frequency B, so that detect the back pressure Pc of compressor.
S206, judges whether the back pressure Pc of compressor is more than or equal to the first preset pressure C and whether the return-air degree of superheat SH of compressor is less than or equal to the second preset value T2.If so, step S205 is returned; If not, step S207 is performed.Wherein, the first preset pressure C determines according to the minimum operating pressure of compressor operating scope, and the second preset value T2 is generally in the scope of 5 ~ 20 DEG C.
That is, when the back pressure PC of compressor is more than or equal to the first preset pressure C and the return-air degree of superheat SH of compressor is less than or equal to the second preset value T2, return and perform step S205, namely, the aperture of electric expansion valve corresponding for the indoor set being in open state is maintained the first default aperture A constant, and it is constant that the running frequency of compressor is maintained predeterminated frequency B.
Namely say, when the first low pressure sensor detects that the back pressure Pc of compressor maintains more than the first preset pressure C value (C value is determined according to the minimum operating pressure value of compressor operating scope) always, and when the return-air degree of superheat of compressor maintains the second below preset value T2 always (T2 is generally within the scope of 5 ~ 30 DEG C), the start aperture of indoor set and the running frequency of compressor maintains A value respectively and B value is constant.
S207, judges whether the return-air degree of superheat SH of compressor is greater than the second preset value T2.If so, step S209 is performed; If not, step S208 is performed.
S208, opens magnetic valve and maintains the second preset time T i2, then returning step S205.Wherein, Ti2 is generally in 5 seconds ~ 2 minutes.Namely say, if the back pressure Pc of compressor is less than the first preset pressure C, then opens magnetic valve and maintain the second Preset Time, the back pressure of auxiliary recovery system, prevent that back pressure is too low to cause damage to compressor.
S209, controls multiple on-line system and recovers normal operating condition.That is, if SH is greater than T2, then represent that the liquid refrigerants of low-pressure liquid storing tank is discharged substantially, multiple on-line system enters normal operating condition.
Therefore; in an embodiment of the present invention; when the return-air degree of superheat of compressor is not enough; the liquid refrigerants of quick discharge low-pressure liquid storing tank; promote the return-air degree of superheat of compressor; and when the liquid refrigerants of discharging low-pressure liquid storing tank may cause low pressure too low, supplementing low pressure by the method arranging bypass solenoid valve, protection compressor is not damaged.
According to the control method of the multiple on-line system of the embodiment of the present invention, when multiple on-line system is run in a chiller mode, first the return-air degree of superheat of compressor is obtained, then when the return-air degree of superheat of compressor is less than the first preset value and continues the first Preset Time, when namely judging that the return-air degree of superheat of compressor is not enough, the aperture of electric expansion valve corresponding for the indoor set being in open state in multiple indoor set is adjusted to first and presets aperture, the liquid refrigerants of low-pressure liquid storing tank can be discharged fast, the return-air degree of superheat of fast lifting compressor, thus reduce the possibility that compressor returns liquid, substantially increase the reliability of system cloud gray model.
Fig. 3 is the structural representation of multiple on-line system according to an embodiment of the invention.As shown in Figure 3, this multiple on-line system comprises: off-premises station 100, multiple indoor set 21,22 ..., 2n, and control module (not shown).
Wherein, each indoor set comprises indoor heat exchanger and electric expansion valve, and such as indoor set 21 comprises indoor heat exchanger 212 and electric expansion valve 211, and indoor set 22 comprises indoor heat exchanger 222 and electric expansion valve 221,, indoor set 2n comprises indoor heat exchanger 2n2 and electric expansion valve 2n1.
As shown in Figure 3, off-premises station 100 comprises outdoor heat exchanger 13, cross valve 12, compressor 11, low-pressure liquid storing tank 15 and magnetic valve 18, and off-premises station restricting element 14, first pressure sensor 16, first temperature sensor 17, capillary 19.Wherein, have first node J1 between outdoor heat exchanger 13 and cross valve 12, magnetic valve 18 and capillary 19 are connected between first node J1 and low-pressure liquid storing tank 15.
Control module is for obtaining the return-air degree of superheat SH of compressor 11, and when the return-air degree of superheat SH of compressor 11 is less than the first preset value T1 and continues the first preset time T i1, the aperture of electric expansion valve corresponding for the indoor set being in open state in multiple indoor set is adjusted to first and presets aperture A by control module, refluxes to prevent the liquid refrigerants in multiple on-line system.
Further, when the return-air degree of superheat SH of compressor is less than the first preset value T1 and continues the first preset time T i1, the running frequency of compressor is also fixed on predeterminated frequency B by control module, so that detect the back pressure Pc of compressor.
Wherein, the first preset value requires to determine according to the minimum degree of superheat of compressor, and the first Preset Time is generally in 0 ~ 5 minute, and first presets aperture generally in 0 1/5 scope to the maximum opening of electric expansion valve.
According to one embodiment of present invention, as shown in Figure 3, by being arranged on the first pressure sensor 16 between compressor 11 and low-pressure liquid storing tank 15 to detect the back pressure Pc of compressor, and by being arranged on the first temperature sensor 17 between compressor 11 and low-pressure liquid storing tank 15 to detect the suction temperature Tc of compressor, control module calculates the return-air degree of superheat SH of compressor according to the suction temperature Tc of saturation temperature Ts corresponding to the back pressure Pc of compressor and compressor, i.e. the return-air degree of superheat SH=Tc-Ts of compressor.
And, when the back pressure Pc of compressor is more than or equal to the first preset pressure C and the return-air degree of superheat SH of compressor is less than or equal to the second preset value T2, it is constant that the aperture of electric expansion valve corresponding for the indoor set being in open state is maintained the first default aperture A by control module, and it is constant that the running frequency of compressor is maintained predeterminated frequency B.Wherein, the first preset pressure C determines according to the minimum operating pressure of compressor operating scope, and the second preset value T2 is generally in the scope of 5 ~ 20 DEG C.
In an embodiment of the present invention, if the back pressure Pc of compressor is less than the first preset pressure C, control module is then opened magnetic valve and is maintained the second preset time T i2; If the return-air degree of superheat SH of compressor is greater than the second preset value T2, control module then controls multiple on-line system and recovers normal operating condition.Wherein, Ti2 is generally in 5 seconds ~ 2 minutes.
According to the multiple on-line system of the embodiment of the present invention, when refrigeration mode runs, the return-air degree of superheat of compressor is obtained by control module, then when the return-air degree of superheat of compressor is less than the first preset value and continues the first Preset Time, when namely judging that the return-air degree of superheat of compressor is not enough, the aperture of electric expansion valve corresponding for the indoor set being in open state in multiple indoor set is adjusted to first and presets aperture by control module, the liquid refrigerants of low-pressure liquid storing tank can be discharged fast, the return-air degree of superheat of fast lifting compressor, thus reduce the possibility that compressor returns liquid, substantially increase the reliability of system cloud gray model.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this description, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only storage (ROM), erasablely edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk read-only storage (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanner to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer storage.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only storage, disk or CD etc.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (10)
1. the control method of a multiple on-line system, it is characterized in that, described multiple on-line system comprises off-premises station and multiple indoor set, each described indoor set comprises indoor heat exchanger and electric expansion valve, described off-premises station comprises outdoor heat exchanger, cross valve, compressor, low-pressure liquid storing tank and magnetic valve, have first node between described outdoor heat exchanger and described cross valve, described magnetic valve is connected between described first node and described low-pressure liquid storing tank, and described control method comprises the following steps:
S1, obtains the return-air degree of superheat of described compressor;
S2, when the return-air degree of superheat of described compressor is less than the first preset value and continues the first Preset Time, the aperture of electric expansion valve corresponding for the indoor set being in open state in described multiple indoor set is adjusted to first and presets aperture, reflux to prevent the liquid refrigerants in described multiple on-line system.
2. the control method of multiple on-line system as claimed in claim 1, is characterized in that, in described step S2, also the running frequency of described compressor is fixed on predeterminated frequency.
3. the control method of multiple on-line system as claimed in claim 1 or 2, it is characterized in that, described step S1 specifically comprises:
Detect the back pressure of described compressor, and detect the suction temperature of described compressor;
The suction temperature of the saturation temperature corresponding according to the back pressure of described compressor and described compressor calculates the return-air degree of superheat of described compressor.
4. the control method of multiple on-line system as claimed in claim 3, is characterized in that, also comprise:
When the back pressure of described compressor is more than or equal to the first preset pressure and the return-air degree of superheat of described compressor is less than or equal to the second preset value, the aperture of electric expansion valve corresponding for the described indoor set being in open state being maintained described first, to preset aperture constant, and it is constant that the running frequency of described compressor is maintained predeterminated frequency.
5. the control method of multiple on-line system as claimed in claim 4, is characterized in that, also comprise:
If the back pressure of described compressor is less than described first preset pressure, then opens described magnetic valve and maintain the second Preset Time;
If the return-air degree of superheat of described compressor is greater than described second preset value, then controls described multiple on-line system and recover normal operating condition.
6. a multiple on-line system, is characterized in that, comprising:
Off-premises station, described off-premises station comprises outdoor heat exchanger, cross valve, compressor, low-pressure liquid storing tank and magnetic valve, have first node between described outdoor heat exchanger and described cross valve, described magnetic valve is connected between described first node and described low-pressure liquid storing tank;
Multiple indoor set, each described indoor set comprises indoor heat exchanger and electric expansion valve; And
Control module, described control module is for obtaining the return-air degree of superheat of described compressor, and the aperture of electric expansion valve corresponding for the indoor set being in open state in described multiple indoor set is adjusted to the first default aperture when the return-air degree of superheat of described compressor is less than the first preset value and continues the first Preset Time, reflux to prevent the liquid refrigerants in described multiple on-line system.
7. multiple on-line system as claimed in claim 6, it is characterized in that, when the return-air degree of superheat of described compressor is less than described first preset value and continues described first Preset Time, the running frequency of described compressor is also fixed on predeterminated frequency by described control module.
8. multiple on-line system as claimed in claims 6 or 7, it is characterized in that, also comprise the first pressure sensor and the first temperature sensor, described first pressure sensor is arranged between described compressor and described low-pressure liquid storing tank, for detecting the back pressure of described compressor, described first temperature sensor is arranged between described compressor and described low-pressure liquid storing tank, for detecting the suction temperature of described compressor, described control module calculates the return-air degree of superheat of described compressor according to the suction temperature of saturation temperature corresponding to the back pressure of described compressor and described compressor.
9. multiple on-line system as claimed in claim 8, it is characterized in that, when the back pressure of described compressor is more than or equal to the first preset pressure and the return-air degree of superheat of described compressor is less than or equal to the second preset value, the aperture of electric expansion valve corresponding for the described indoor set being in open state is maintained described first by described control module, and to preset aperture constant, and it is constant that the running frequency of described compressor is maintained predeterminated frequency.
10. multiple on-line system as claimed in claim 9, is characterized in that, wherein,
If the back pressure of described compressor is less than described first preset pressure, described control module is then opened described magnetic valve and is maintained the second Preset Time;
If the return-air degree of superheat of described compressor is greater than described second preset value, described control module then controls described multiple on-line system and recovers normal operating condition.
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