CN107559953A - Multiple on-line system and its control method and device that loop valve body is subcooled - Google Patents
Multiple on-line system and its control method and device that loop valve body is subcooled Download PDFInfo
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- CN107559953A CN107559953A CN201710697630.2A CN201710697630A CN107559953A CN 107559953 A CN107559953 A CN 107559953A CN 201710697630 A CN201710697630 A CN 201710697630A CN 107559953 A CN107559953 A CN 107559953A
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Abstract
The invention discloses a kind of multiple on-line system and its control method and device of supercooling loop valve body, the control method to comprise the following steps：When multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, the outlet superheat degree of the second heat exchange stream of First Heat Exchanger is obtained, and the aperture that loop valve body is subcooled is adjusted according to outlet superheat degree and current goal outlet superheat degree；Whether judge in multiple indoor sets with the presence of indoor set cold medium shortage；If with the presence of indoor set cold medium shortage in multiple indoor sets, then current goal outlet superheat degree is heightened, and the aperture that loop valve body is subcooled is adjusted according to the target outlet degree of superheat after regulation and outlet superheat degree, so as to realize be subcooled on the premise of avoid freezing indoor set there is cold medium shortage, bias current and return liquid the problems such as.
Description
Technical field
The present invention relates to air-conditioning technical field, the controlling party of loop valve body is subcooled in more particularly to a kind of multiple on-line system
The control device of loop valve body and a kind of multiple on-line system with the control device are subcooled in method, a kind of multiple on-line system.
Background technology
Generally, the part flow arrangement of multiple on-line system is arranged in liquid pipe, and is subcooled on stream and is crossed low temperature valve using overheat
Degree control, to realize the supercooling of main road refrigerant.
In actual applications, in order to save installation cost, the indoor set that part flow arrangement can connect is more and more, that is, shunts
The capacity of device is increasing, namely cross low temperature valve the scope taken into account of type selecting it is larger, when the part flow arrangement connection of Large Copacity is less
Indoor set or system when there was only operation at part load, if the aperture for crossing low temperature valve is excessive, easily cause refrigeration indoor set
Cold medium shortage or bias current (i.e. the cold medium shortage of part indoor set).In addition it is larger cross low temperature valve big aperture Smaller load when
Wait, refrigerant easily occur and return liquid.
The content of the invention
It is contemplated that at least solves one of technical problem in above-mentioned technology to a certain extent.
Therefore, the controlling party of loop valve body is being subcooled in first purpose of the present invention in a kind of multiple on-line system is proposed
Method, Large Copacity part flow arrangement can be avoided to connect and there was only part in less indoor set or system on the premise of supercooling is realized
Caused refrigeration indoor set cold medium shortage or bias current during load operation, or the problems such as return liquid.
Second object of the present invention is to propose a kind of computer-readable recording medium.
The control device of loop valve body is being subcooled in third object of the present invention in a kind of multiple on-line system is proposed.
Fourth object of the present invention is to propose a kind of multiple on-line system.
To reach above-mentioned purpose, first aspect present invention embodiment proposes supercooling loop valve body in a kind of multiple on-line system
Control method, the multiple on-line system includes outdoor unit, multiple indoor sets and part flow arrangement, and the part flow arrangement includes first
Heat exchanger, the entrance of the first heat exchange stream of the First Heat Exchanger are connected with the high-pressure liquid tube of the outdoor unit, and described first
The outlet of first heat exchange stream of heat exchanger is connected with each indoor set in the multiple indoor set, the First Heat Exchanger
The entrance of second heat exchange stream is connected by the way that loop valve body is subcooled with the first outlet for exchanging heat stream of the First Heat Exchanger, institute
State First Heat Exchanger second heat exchange stream outlet be connected with the low pressure gas pipe of the outdoor unit, the control method including with
Lower step：When the multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, obtain described first and change
The outlet superheat degree of second heat exchange stream of hot device, and according to the outlet superheat degree and current goal outlet superheat degree to described
The aperture of supercooling loop valve body is adjusted；Whether judge in the multiple indoor set with the presence of indoor set cold medium shortage；If
With the presence of indoor set cold medium shortage in the multiple indoor set, then the current goal outlet superheat degree is heightened, and according to tune
The aperture of the supercooling loop valve body is adjusted for the target outlet degree of superheat and the outlet superheat degree after section.
The control method of loop valve body is subcooled in multiple on-line system according to embodiments of the present invention, when multiple on-line system is with pure
When refrigeration mode or hybrid refrigeration heating mode are run, the outlet superheat of the second heat exchange stream of First Heat Exchanger is obtained first
Degree, and the aperture that loop valve body is subcooled is adjusted according to outlet superheat degree and current goal outlet superheat degree, then judge
Whether with the presence of indoor set cold medium shortage in multiple indoor sets, if it is, current goal outlet superheat degree is heightened, and according to
The aperture that loop valve body is subcooled is adjusted for the target outlet degree of superheat and outlet superheat degree after regulation.This method can be in reality
On the premise of being now subcooled, avoid leading when there was only operation at part load in the less indoor set of Large Copacity part flow arrangement connection or system
The refrigeration indoor set cold medium shortage of cause or bias current, or return liquid the problems such as.
In addition, the control method that loop valve body is subcooled in multiple on-line system according to the above embodiment of the present invention can also have
There is technical characteristic additional as follows：
According to one embodiment of present invention, if not with the presence of indoor set cold medium shortage in the multiple indoor set,
The current goal outlet superheat degree is controlled to keep constant.
According to one embodiment of present invention, if indoor set in the multiple indoor set be present returns liquid and the indoor set
The aperture of restricting element reaches default minimum allowable aperture, then turns down the current goal outlet superheat degree.
According to one embodiment of present invention, it is described according to the outlet superheat degree and current goal outlet superheat degree to institute
The aperture for stating supercooling loop valve body is adjusted, including：If the outlet superheat degree is more than the current goal outlet superheat
Degree, then the aperture of the supercooling loop valve body is tuned up；If the outlet superheat degree is less than the current goal outlet superheat
Degree, then the aperture of the supercooling loop valve body is turned down.
According to one embodiment of present invention, the control method of loop valve body is subcooled in above-mentioned multiple on-line system, also wraps
Include：Obtain the total load for the indoor set that freezes in the multiple indoor set and the capacity of the part flow arrangement；According to the cool room
The ratio of the total load of interior machine and the capacity of the part flow arrangement obtains the maximum allowable aperture of the supercooling loop valve body, and makes
The aperture of the supercooling loop valve body is less than or equal to the maximum allowable aperture, wherein, the maximum allowable aperture and the ratio
It is worth correlation.
To achieve the above object, second aspect of the present invention embodiment proposes a kind of computer-readable recording medium, has
Instruction therein is stored in, when executed, the part flow arrangement performs to be subcooled back in above-mentioned multiple on-line system
The control method of road valve body.
Computer-readable recording medium according to embodiments of the present invention, it is subcooled back by performing in above-mentioned multiple on-line system
The control method of road valve body, can on the premise of realizing and being subcooled, avoid Large Copacity part flow arrangement connect less indoor set or
The problems such as there was only caused freeze indoor set cold medium shortage or bias current during operation at part load in system, or returning liquid.
To achieve the above object, third aspect present invention embodiment proposes supercooling loop valve body in a kind of multiple on-line system
Control device, the multiple on-line system includes outdoor unit, multiple indoor sets and part flow arrangement, and the part flow arrangement includes first
Heat exchanger, the entrance of the first heat exchange stream of the First Heat Exchanger are connected with the high-pressure liquid tube of the outdoor unit, and described first
The outlet of first heat exchange stream of heat exchanger is connected with each indoor set in the multiple indoor set, the First Heat Exchanger
The entrance of second heat exchange stream is connected by the way that loop valve body is subcooled with the first outlet for exchanging heat stream of the First Heat Exchanger, institute
The outlet for stating the second heat exchange stream of First Heat Exchanger is connected with the low pressure gas pipe of the outdoor unit, and the control device includes：
First acquisition module, for when the multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, obtaining
The outlet superheat degree of second heat exchange stream of the First Heat Exchanger；Control module, for according to the outlet superheat degree and work as
The aperture of the supercooling loop valve body is adjusted the preceding target outlet degree of superheat；Judge module, for judging the multiple room
Whether with the presence of indoor set cold medium shortage in interior machine；The control module, being additionally operable to work as in the multiple indoor set has indoor set
When cold medium shortage be present, the current goal outlet superheat degree is heightened, and according to the target outlet degree of superheat after regulation and institute
Outlet superheat degree is stated the aperture of the supercooling loop valve body is adjusted.
The control device of loop valve body is subcooled in multiple on-line system according to embodiments of the present invention, when multiple on-line system is with pure
When refrigeration mode or hybrid refrigeration heating mode are run, changed first by the second of the first acquisition module acquisition First Heat Exchanger
The outlet superheat degree of hot flowpath, and by control module according to outlet superheat degree and current goal outlet superheat degree to crossing cold loop
The aperture of valve body is adjusted.Then, whether judged by judge module in multiple indoor sets with the presence of indoor set cold medium shortage,
When in multiple indoor sets with the presence of indoor set cold medium shortage, also current goal outlet superheat degree is heightened by control module,
And the aperture that loop valve body is subcooled is adjusted according to the target outlet degree of superheat after regulation and outlet superheat degree.The device energy
Enough on the premise of supercooling is realized, avoiding Large Copacity part flow arrangement from connecting in less indoor set or system, only sub-load is transported
Caused refrigeration indoor set cold medium shortage or bias current during row, or the problems such as return liquid.
In addition, the control device that loop valve body is subcooled in the multiple on-line system proposed according to the above embodiment of the present invention may be used also
With technical characteristic additional as follows：
According to one embodiment of present invention, if not with the presence of indoor set cold medium shortage, institute in the multiple indoor set
Stating control module then controls the current goal outlet superheat degree to keep constant.
According to one embodiment of present invention, if indoor set in the multiple indoor set be present returns liquid and the indoor set
The aperture of restricting element reaches default minimum allowable aperture, and the control module then adjusts the current goal outlet superheat degree
It is low.
According to one embodiment of present invention, the control module goes out to make a slip of the tongue according to the outlet superheat degree and current goal
When the aperture of the supercooling loop valve body is adjusted temperature, wherein, if the outlet superheat degree is more than the current mesh
Temperature of making a slip of the tongue is marked, the control module then tunes up the aperture of the supercooling loop valve body；If the outlet superheat degree is small
In the current goal outlet superheat degree, the control module then turns the aperture of the supercooling loop valve body down.
According to one embodiment of present invention, the control device of loop valve body is subcooled in above-mentioned multiple on-line system, also wraps
Include：Second acquisition module, for obtaining the total load for the indoor set that freezes in the multiple indoor set and the appearance of the part flow arrangement
Amount；The control module, it is additionally operable to be obtained according to the ratio of the total load and the capacity of the part flow arrangement of the refrigeration indoor set
The maximum allowable aperture of the supercooling loop valve body is taken, and the aperture of the supercooling loop valve body is less than or equal to the maximum and permits
Perhaps aperture, wherein, the maximum allowable aperture and the ratio correlation.
To achieve the above object, fourth aspect present invention embodiment proposes a kind of multiple on-line system, and it includes above-mentioned
The control device of loop valve body is subcooled in multiple on-line system.
Multiple on-line system according to embodiments of the present invention, by the control that loop valve body is subcooled in above-mentioned multiple on-line system
Device, Large Copacity part flow arrangement can be avoided to connect and there was only portion in less indoor set or system on the premise of supercooling is realized
The problems such as dividing caused freeze indoor set cold medium shortage or bias current during load operation, or returning liquid.
Brief description of the drawings
Fig. 1 is the structural representation of multiple on-line system according to an embodiment of the invention；
Fig. 2 is refrigerant flow graph when multiple on-line system according to an embodiment of the invention is in pure refrigeration mode；
When Fig. 3 is that multiple on-line system according to an embodiment of the invention is in main refrigeration mode or main heating mode
Refrigerant flow graph；
Fig. 4 is the flow chart for the control method that loop valve body is subcooled in multiple on-line system according to embodiments of the present invention；
Fig. 5 is the ratio and mistake according to the total load of one embodiment of the invention refrigeration indoor set and the capacity of part flow arrangement
The relation schematic diagram of the maximum opening of cold loop valve body；
Fig. 6 is the square frame signal for the control device that loop valve body is subcooled in multiple on-line system according to embodiments of the present invention
Figure；And
Fig. 7 is that the square frame for the control device that loop valve body is subcooled in multiple on-line system according to an embodiment of the invention shows
It is intended to.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below in conjunction with the accompanying drawings come describe the embodiment of the present invention proposition multiple on-line system in be subcooled loop valve body controlling party
The control device of loop valve body is subcooled in method, computer-readable recording medium, multiple on-line system and there are the more of the control device
On-line system.
In an embodiment of the present invention, multiple on-line system includes outdoor unit, multiple indoor sets and part flow arrangement, part flow arrangement
Including First Heat Exchanger, the entrance of the first heat exchange stream of First Heat Exchanger is connected with the high-pressure liquid tube of outdoor unit, the first heat exchange
The outlet of first heat exchange stream of device is connected with each indoor set in multiple indoor sets, the second heat exchange stream of First Heat Exchanger
First outlet that exchanges heat stream of the entrance by the way that loop valve body and First Heat Exchanger is subcooled be connected, the second of First Heat Exchanger changes
The outlet of hot flowpath is connected with the low pressure gas pipe of outdoor unit.
Specifically, as shown in figure 1, multiple on-line system may include outdoor unit 10, multiple indoor sets 20 and part flow arrangement 30.Room
Outer machine 10 may include the first outdoor heat exchanger 11, the second outdoor heat exchanger 12, compressor 13, outdoor gas-liquid separator 14, first
The outer restricting element of four-way valve ST1, the second four-way valve ST2, the 3rd four-way valve ST3, the first outdoor restricting element EXVA and second Room
EXVB.Wherein, the exhaust outlet of compressor 13 is connected by the first four-way valve ST1 with one end of the first outdoor heat exchanger 11, and first
The other end of outdoor heat exchanger 11 is connected to high-pressure liquid tube by the first outdoor restricting element EXVA；The exhaust outlet of compressor 13 leads to
One end that the second four-way valve ST2 is crossed with the second outdoor heat exchanger 12 is connected, and the other end of the second outdoor heat exchanger 12 passes through second
Outdoor restricting element EXVB is connected to high-pressure liquid tube；The exhaust outlet of compressor 13 passes through the 3rd four-way valve ST3 and high-pressure air pipe phase
Even.The gas returning port of compressor 13 is connected with one end of outdoor gas-liquid separator 14, the other end difference of outdoor gas-liquid separator 14
It is connected with the first four-way valve ST1, the second four-way valve ST2, the 3rd four-way valve ST3 and low pressure gas pipe.
Multiple indoor sets 20 may include first to fourth indoor set.Wherein, the first indoor set includes the first indoor heat exchanger
The 21 and first indoor restricting element EXV1, the second indoor set include restricting element in the second indoor heat exchanger 22 and second Room
EXV2, the 3rd indoor set include the 3rd indoor heat exchanger 23 and the 3rd indoor restricting element EXV3, and machine includes the 4th in fourth ventricle
Restricting element EXV4 in indoor heat exchanger 24 and fourth ventricle.
Part flow arrangement 30 may include First Heat Exchanger 31, supercooling loop valve body EV, multiple heating check valves 311,312,313
With 314, multiple refrigeration check valve 321,322,323 and 324, multiple heating on-off valves 331,332,333 and 334 and multiple systems
Cold on-off valve 341,342,343 and 344.Wherein, the height of the entrance and outdoor unit 10 of the first heat exchange stream of First Heat Exchanger 31
Hydraulic fluid pipe is connected, and the outlet of the first heat exchange stream of First Heat Exchanger 31 is connected with each indoor set in multiple indoor sets 20,
First heat exchange of the entrance of second heat exchange stream of First Heat Exchanger 31 by the way that loop valve body EV and First Heat Exchanger 31 is subcooled is flowed
The outlet on road is connected, and the outlet of the second heat exchange stream of First Heat Exchanger 31 is connected with the low pressure gas pipe of outdoor unit 10.Wherein,
First heat exchange stream of one heat exchanger 31 is the main road of part flow arrangement 30, and the second heat exchange stream of First Heat Exchanger 31 fills for shunting
Put 30 cooling circuit again.It can be electric expansion valve that loop valve body EV, which is subcooled, and First Heat Exchanger 31 can be plate type heat exchanger.
Heat exchanger 24 in first indoor heat exchanger 21, the second indoor heat exchanger 22, the 3rd indoor heat exchanger 23 and fourth ventricle
One end respectively by it is corresponding it is multiple heating on-off valves 331,332,333 and 334 be connected with high-pressure air pipe, the first indoor heat exchange
One end of heat exchanger 24 also passes through correspondingly respectively in device 21, the second indoor heat exchanger 22, the 3rd indoor heat exchanger 23 and fourth ventricle
Multiple refrigeration on-off valves 341,342,343 and 344 be connected with low pressure gas pipe, exchange heat in the first indoor heat exchanger 21, second Room
In device 22, the 3rd indoor heat exchanger 23 and fourth ventricle the other end of heat exchanger 24 respectively with the corresponding first indoor restricting element
In EXV1, second Room in restricting element EXV2, the 3rd indoor restricting element EXV3 and fourth ventricle restricting element EXV4 one end phase
Even, restricting element EXV2, the 3rd indoor restricting element EXV3 and fourth ventricle internal segment in the first indoor restricting element EXV1, second Room
The fluid element EXV4 other end is connected by corresponding multiple heating check valves 311,312,313 and 314 with high-pressure liquid tube respectively,
Throttled in first indoor restricting element EXV1, second Room in restricting element EXV2, the 3rd indoor restricting element EXV3 and fourth ventricle
The element EXV4 other end also passes through multiple refrigeration check valves 321,322,323 and 324 and the first of First Heat Exchanger 31 respectively
The outlet of heat exchange stream is connected.
When multiple on-line system is run with pure refrigeration mode, as shown in Fig. 2 the exhaust outlet of compressor 13 passes through the first four-way
Valve ST1 and the second four-way valve ST2 distinguishes the first outdoor heat exchanger 11 and directly connected with the second outdoor heat exchanger 12.Wherein, first
The outdoor heat exchanger 12 of outdoor heat exchanger 11 and second is used as condenser.Now, the high temperature discharged from the exhaust outlet of compressor 13
High-pressure gaseous refrigerant is divided into two-way：The first outdoor heat exchanger 11 is flowed to after the first four-way valve ST1 all the way, is become after condensing heat release
Into HTHP liquid refrigerant, enter high-pressure liquid tube after the first outdoor restricting element EXVA throttlings；Another way passes through the two or four
The second outdoor heat exchanger 12 is flowed to after port valve ST2, becomes HTHP liquid refrigerant after condensing heat release, through the member that throttled outside second Room
Enter high-pressure liquid tube after part EXVB throttlings.After two-way refrigerant converges, the part in refrigerant passes through the first of First Heat Exchanger 31
Exchange heat after stream, corresponding first to fourth indoor set, warp are distributed to by multiple refrigeration check valves 321,322,323 and 324
After entering first to fourth indoor heat exchanger evaporation endothermic after the restricting element of first to fourth indoor set, turn into medium temperature low pressure gas
State refrigerant, the medium temperature low-pressure gaseous refrigerant of first to fourth indoor set pass through multiple refrigeration corresponding with first to fourth indoor set
On-off valve 341,342,343 and 344 is merged in low pressure gas pipe；Another part enters after supercooling loop valve body EV throttlings
Second heat exchange stream, second heat exchange stream absorb first heat exchange stream in refrigerant heat after, become low-pressure gaseous refrigerant, enter
Low pressure gas pipe.Refrigerant in low pressure gas pipe flows back to the gas returning port of compressor 13 by outdoor gas-liquid separator 14.
When multiple on-line system is run with hybrid refrigeration heating mode (including main heating mode or main refrigeration mode), such as
Shown in Fig. 3, it is assumed that the first outdoor heat exchanger 11 is evaporator, and the second outdoor heat exchanger 12 is condenser, the first indoor set and
Four indoor sets are refrigeration indoor set, and the second indoor set and the 3rd indoor set are heating indoor set.Now, from the exhaust of compressor 13
The high pressure gaseous refrigerant of mouth discharge is divided into two-way：The second outdoor heat exchanger 12 is flowed to after the second four-way valve ST2 all the way,
Become HTHP liquid refrigerant after condensation heat release, enter high-pressure liquid tube after restricting element EXVB throttlings outside second Room；It is another
Road is by the 3rd four-way valve ST3 and heating on-off valve 332 and 333 corresponding with the second heating indoor set and the 3rd indoor set difference
Afterwards, into the second heating indoor set and the 3rd indoor set indoor heat exchanger, through the second indoor heat exchanger 22 and the 3rd indoor heat exchange
Device 23 turns into medium temperature low-pressure gaseous refrigerant after condensing heat release, then through passing through restricting element EXV2 and the 3rd indoor section in second Room
After fluid element EXV3 reducing pressure by regulating flow, enter high-pressure liquid tube through heating check valve 312 and 313.From the refrigerant one of high-pressure liquid tube outflow
Part enters First Heat Exchanger 31, and the refrigerant into the first indoor heat exchanger is entered respectively by the check valve 321 and 324 that freezes all the way
Enter machine in the first indoor set and fourth ventricle, after machine evaporation endothermic in the first indoor set and fourth ventricle, turn into middle pressure gaseous coolant,
Enter low pressure gas pipe through corresponding refrigeration on-off valve 341 and 344, another way flows by the way that loop valve body EV is subcooled by the second heat exchange
Road enters low pressure gas pipe, and the refrigerant for collecting in low pressure gas pipe flows back to the gas returning port of compressor 13 by outdoor gas-liquid separator 14；
The first outdoor heat exchanger 11 that another part enters in outdoor unit 10, after the evaporation endothermic of the first outdoor heat exchanger 11, by the
One four-way valve ST1 enters outdoor gas-liquid separator 14, and the gas returning port of compressor 13 is flowed back to through outdoor gas-liquid separator 14.
Fig. 4 is the flow chart for the control method that loop valve body is subcooled in multiple on-line system according to embodiments of the present invention.Such as
Shown in Fig. 4, the control method of loop valve body is subcooled in the multiple on-line system may include following steps：
S1, when multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, obtain First Heat Exchanger
The second heat exchange stream outlet superheat degree, and according to outlet superheat degree and current goal outlet superheat degree to loop valve body is subcooled
Aperture be adjusted.
According to one embodiment of present invention, according to outlet superheat degree and current goal outlet superheat degree to return valve is subcooled
The aperture of body is adjusted, including：If outlet superheat degree is more than current goal outlet superheat degree, loop valve body will be subcooled
Aperture tunes up；If outlet superheat degree is less than current goal outlet superheat degree, the aperture that loop valve body is subcooled is turned down.
Specifically, when multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, by being arranged on
The temperature sensor (such as temperature-sensitive bag) and pressure sensor in the exit of the second heat exchange stream of First Heat Exchanger obtain the respectively
The temperature Tout and pressure PL in the exit of two heat exchange streams, and calculate the of First Heat Exchanger according to temperature Tout and pressure PL
The outlet superheat degree DSH=Tout-T of two heat exchange streams, wherein, T is saturation temperature corresponding to pressure PL.
Or the temperature sensor (such as temperature-sensitive bag) in the exit of the second heat exchange stream by being arranged on First Heat Exchanger
Second is obtained respectively with the temperature sensor (such as temperature-sensitive bag) of the porch for the second heat exchange stream for being arranged on First Heat Exchanger to change
The temperature Tout in the exit of the hot flowpath and temperature Tin of porch, and according to the temperature Tout in exit and the temperature of porch
Spend the outlet superheat degree DSH=Tout-Tin that Tin calculates the second heat exchange stream of First Heat Exchanger.
Then, outlet superheat degree DSH is obtained every the first preset time (such as 20s), and according to outlet superheat degree DSH and worked as
The aperture that loop valve body is subcooled is adjusted preceding target outlet degree of superheat DSHm1, wherein, if DSH ＞ DSHm1, incited somebody to action
The aperture of cold loop valve body tunes up, to reduce outlet superheat degree DSH；If DSH ＜ DSHm1, opening for loop valve body will be subcooled
Degree is turned down, to increase outlet superheat degree DSH.By to be subcooled loop valve body aperture regulation so that outlet superheat degree DSH and work as
Preceding target outlet degree of superheat DSHm1 is equal or close.
S2, whether judge in multiple indoor sets with the presence of indoor set cold medium shortage.
Specifically, can be judged according to the parameter of refrigeration indoor set in multiple indoor sets whether with the presence of indoor set refrigerant not
Foot.Wherein, the parameter of indoor set of freezing may include indoor environment temperature, user's design temperature, the leaving air temp of indoor set, interior
The aperture of restricting element, the inlet temperature of indoor heat exchanger, outlet temperature of indoor heat exchanger etc..
For example, when multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, if system
The outlet superheat degree (inlet temperature of outlet temperature-indoor set heat exchanger of indoor heat exchanger) of the indoor heat exchanger of cold indoor set
Exceed predetermined threshold value for a long time, and the aperture of the indoor restricting element of the refrigeration indoor set has been maxed out aperture, simultaneously should
The leaving air temp of refrigeration indoor set and the difference very little (or even close) of indoor environment temperature, then judge that the refrigeration indoor set is present
Cold medium shortage, the problem of now judgement in multiple indoor sets with the presence of indoor set cold medium shortage.
S3, if current goal outlet superheat degree is heightened with the presence of indoor set cold medium shortage in multiple indoor sets, and
The aperture that loop valve body is subcooled is adjusted according to the target outlet degree of superheat after regulation and outlet superheat degree.
According to one embodiment of present invention, if do not controlled in multiple indoor sets with the presence of indoor set cold medium shortage
Current goal outlet superheat degree keeps constant.
According to one embodiment of present invention, if indoor set in multiple indoor sets be present returns liquid and the throttling of the indoor set
The aperture of element reaches default minimum allowable aperture, then turns down current goal outlet superheat degree.
Specifically, when multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, if multiple rooms
Do not illustrate then to get in the cold of machine by the first heat exchange stream of First Heat Exchanger with the presence of indoor set cold medium shortage in interior machine
Matchmaker is enough to make refrigeration indoor set ensure refrigeration, now controls current goal outlet superheat degree DSHm1 to keep constant.
If illustrate the refrigerant mistake by supercooling loop valve body with the presence of indoor set cold medium shortage in multiple indoor sets
It is more, the cold medium shortage of machine is got in so that refrigeration indoor set ensures refrigeration effect by the first heat exchange stream of First Heat Exchanger
Fruit, current goal outlet superheat degree DSHm1 can now be heightened to certain value, and according to the target outlet degree of superheat after regulation
The aperture that loop valve body is subcooled is adjusted DSHm2.Due to passing through regulation above, the second heat exchange stream of First Heat Exchanger
The degree of superheat DSH of outlet and target outlet degree of superheat DSHm1 are of substantially equal, and DSHm1 is less than the target outlet overheat after regulation
DSHm2 is spent, so now DSH turns the aperture that loop valve body is subcooled down certainly less than DSHm2, and then according to DSHm2, so that through
The refrigerant for crossing the valve body of cold loop is reduced in right amount, and the first heat exchange stream for passing through First Heat Exchanger gets in the refrigerant of machine
Appropriate increase, to eliminate the situation of refrigeration indoor set cold medium shortage or bias current.
But during regulation, the target outlet degree of superheat nor can increase, target after regulation always
When outlet superheat degree DSHm2 is excessive, it is likely that cause the appearance of another situation, for example, compressor air-discharging is too high or mistake
Cold loop valve body does not have effect of supercooling etc., so the target outlet degree of superheat DSHm2 limited after regulation is less than or equal to
DSHm1-MAX。
If exist in multiple indoor sets indoor set return liquid and the restricting element of the indoor set aperture reach it is default most
Small permission aperture, then current goal outlet superheat degree DSHm1 is turned down into certain value, then overheated according to the target outlet after regulation
The aperture that loop valve body is subcooled is adjusted degree DSHm3.Due to passing through regulation above, the second heat exchange stream of First Heat Exchanger
The degree of superheat DSH of way outlet and target outlet degree of superheat DSHm1 are of substantially equal, and DSHm1 is more than the target outlet mistake after regulation
Temperature DSHm3, so now first gradually open the aperture greater than cold loop valve body so that by the refrigerant of valve body of cold loop fit
Amount increase, and the refrigerant that the first heat exchange stream for passing through First Heat Exchanger gets in machine is reduced in right amount.Thus, supercooling is being realized
On the premise of, it can avoid causing when there was only operation at part load in the less indoor set of Large Copacity part flow arrangement connection or system
Refrigeration indoor-unit cooling-medium the problem of returning liquid.
But during regulation, the target outlet degree of superheat nor can reduce, when target outlet overheats always
When degree DSHm3 is too small, the problem of loop valve body itself is there is also liquid is returned is subcooled, so limiting the target outlet degree of superheat after regulation
DSHm3 is more than or equal to DSHm1-MIN.
Further, according to one embodiment of present invention, the control of loop valve body is subcooled in above-mentioned multiple on-line system
Method also includes：Obtain the total load for the indoor set that freezes in multiple indoor sets and the capacity of part flow arrangement；According to refrigeration indoor set
Total load and the ratio of capacity of part flow arrangement obtain the maximum allowable aperture of supercooling loop valve body, and make supercooling loop valve body
Aperture be less than or equal to maximum allowable aperture, wherein, maximum allowable aperture and ratio correlation.
That is, when multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, also obtain more
Freeze in individual indoor set indoor set total load and part flow arrangement capacity (part flow arrangement connects the maximum of indoor unit capability,
Specifically determined by the design object and hardware of multiple on-line system), and according in multiple indoor sets freeze indoor set total load and
The maximum allowable aperture of the procurement of reserve capacity supercooling loop valve body of part flow arrangement, is then adjusted in the aperture to loop valve body is subcooled
During section, ensure that the aperture of supercooling loop valve body not over the maximum allowable aperture, can so be directed to different load
Different maximum allowable apertures is set, to prevent from causing because aperture is excessive cold medium shortage or bias current, and the problems such as return liquid.Its
In, the ratio of the total load for the indoor set that freezes and the capacity of part flow arrangement is with the relation of the maximum opening of supercooling loop valve body as schemed
Shown in 5, with the increase of the ratio of the freeze total load of indoor set and the capacity of part flow arrangement, the maximum of supercooling loop valve body permits
Perhaps aperture increase, when the ratio of the freeze total load of indoor set and the capacity of part flow arrangement is 1, the maximum of loop valve body is subcooled
Allow aperture maximum, can specifically be obtained by experiment test.
In summary, the control method of loop valve body is subcooled in multiple on-line system according to embodiments of the present invention, when multi-joint
When machine system is run with pure refrigeration mode or hybrid refrigeration heating mode, the second heat exchange stream of First Heat Exchanger is obtained first
Outlet superheat degree, and the aperture that loop valve body is subcooled is adjusted according to outlet superheat degree and current goal outlet superheat degree
Whether section, then judge with the presence of indoor set cold medium shortage in multiple indoor sets, if it is, by current goal outlet superheat degree
Heighten, and the aperture that loop valve body is subcooled is adjusted according to the target outlet degree of superheat after regulation and outlet superheat degree.Should
Method can avoid Large Copacity part flow arrangement from connecting and there was only part in less indoor set or system on the premise of supercooling is realized
Caused refrigeration indoor set cold medium shortage or bias current during load operation, or the problems such as return liquid.
In addition, embodiments of the invention also proposed a kind of computer-readable recording medium, have and be stored in finger therein
Order, when executed, part flow arrangement perform the control method that loop valve body is subcooled in above-mentioned multiple on-line system.
Computer-readable recording medium according to embodiments of the present invention, it is subcooled back by performing in above-mentioned multiple on-line system
The control method of road valve body, can on the premise of realizing and being subcooled, avoid Large Copacity part flow arrangement connect less indoor set or
The problems such as there was only caused freeze indoor set cold medium shortage or bias current during operation at part load in system, or returning liquid.
The control device that loop valve body is subcooled in the multiple on-line system of the embodiment of the present invention will be described below.
In an embodiment of the present invention, as shown in figure 1, multiple on-line system includes outdoor unit 10, multiple indoor sets 20 and divided
Device 30 is flowed, part flow arrangement 30 includes First Heat Exchanger 31, the entrance and outdoor unit of the first heat exchange stream of First Heat Exchanger 31
10 high-pressure liquid tube is connected, the outlet of the first heat exchange stream of First Heat Exchanger 31 and each indoor set in multiple indoor sets 20
It is connected, the entrance of the second heat exchange stream of First Heat Exchanger 31 is changed by the way that loop valve body EV is subcooled with the first of First Heat Exchanger 31
The outlet of hot flowpath is connected, and the outlet of the second heat exchange stream of First Heat Exchanger 31 is connected with the low pressure gas pipe of outdoor unit 10.
Fig. 6 is the square frame signal for the control device that loop valve body is subcooled in multiple on-line system according to embodiments of the present invention
Figure.As shown in fig. 6, the control device that loop valve body is subcooled in the multiple on-line system may include the first acquisition module 100, control mould
Block 200 and judge module 300.
Wherein, when multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, the first acquisition module
The outlet superheat degree of 100 the second heat exchange stream for obtaining First Heat Exchanger.Control module 200 is used for according to outlet superheat degree
The aperture that loop valve body is subcooled is adjusted with current goal outlet superheat degree.Judge module 300 is used to judge multiple interiors
Whether with the presence of indoor set cold medium shortage in machine.When in multiple indoor sets with the presence of indoor set cold medium shortage, control module 200
It is additionally operable to heighten current goal outlet superheat degree, and according to the target outlet degree of superheat after regulation and outlet superheat degree to supercooling
The aperture of loop valve body is adjusted.
According to one embodiment of present invention, if not controlling mould with the presence of indoor set cold medium shortage in multiple indoor sets
Block 200 then controls current goal outlet superheat degree to keep constant.
According to one embodiment of present invention, if indoor set in multiple indoor sets be present returns liquid and the throttling of the indoor set
The aperture of element reaches default minimum allowable aperture, and control module 200 then turns down current goal outlet superheat degree.
According to one embodiment of present invention, control module 200 is according to outlet superheat degree and current goal outlet superheat degree
When the aperture that loop valve body is subcooled is adjusted, wherein, if outlet superheat degree is more than current goal outlet superheat degree, control
Module 200 then tunes up the aperture that loop valve body is subcooled；If outlet superheat degree is less than current goal outlet superheat degree, mould is controlled
Block 200 then turns the aperture that loop valve body is subcooled down.
According to one embodiment of present invention, as shown in fig. 7, the control of loop valve body is subcooled in above-mentioned multiple on-line system
Device may also include the second acquisition module 400, and the second acquisition module 400 is used to obtain the total of indoor set of in multiple indoor sets freezing
The capacity of load and part flow arrangement, control module 200 are additionally operable to the capacity of the total load and part flow arrangement according to refrigeration indoor set
Ratio obtain the maximum allowable aperture of supercooling loop valve body, and make the aperture of supercooling loop valve body be less than or equal to maximum allowable open
Degree, wherein, maximum allowable aperture and ratio correlation.
Do not disclosed it should be noted that being subcooled in the multiple on-line system of the embodiment of the present invention in the control device of loop valve body
Details, refer in the multiple on-line system of the embodiment of the present invention be subcooled loop valve body control method disclosed in details,
It is specific that I will not elaborate.
The control device of loop valve body is subcooled in multiple on-line system according to embodiments of the present invention, when multiple on-line system is with pure
When refrigeration mode or hybrid refrigeration heating mode are run, changed first by the second of the first acquisition module acquisition First Heat Exchanger
The outlet superheat degree of hot flowpath, and by control module according to outlet superheat degree and current goal outlet superheat degree to crossing cold loop
The aperture of valve body is adjusted.Then, whether judged by judge module in multiple indoor sets with the presence of indoor set cold medium shortage,
When in multiple indoor sets with the presence of indoor set cold medium shortage, also current goal outlet superheat degree is heightened by control module,
And the aperture that loop valve body is subcooled is adjusted according to the target outlet degree of superheat after regulation and outlet superheat degree.The device energy
Enough on the premise of supercooling is realized, avoiding Large Copacity part flow arrangement from connecting in less indoor set or system, only sub-load is transported
Caused refrigeration indoor set cold medium shortage or bias current during row, or the problems such as return liquid.
In addition, embodiments of the invention also proposed a kind of multiple on-line system, it includes above-mentioned supercooling loop valve body
Control device.
Multiple on-line system according to embodiments of the present invention, by the control that loop valve body is subcooled in above-mentioned multiple on-line system
Device, Large Copacity part flow arrangement can be avoided to connect and there was only portion in less indoor set or system on the premise of supercooling is realized
The problems such as dividing caused freeze indoor set cold medium shortage or bias current during load operation, or returning liquid.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, software that multiple steps or method can be performed in memory and by suitable instruction execution system with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, have suitable combinational logic gate circuit application specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In addition, in the description of the invention, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ",
" on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " clockwise ", " inverse time
The orientation or position relationship of the instruction such as pin ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or position relationship,
Be for only for ease of the description present invention and simplify description, rather than instruction or imply signified device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, limited unless otherwise clear and definite.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (12)
1. the control method of loop valve body is subcooled in a kind of multiple on-line system, it is characterised in that the multiple on-line system includes room
Outer machine, multiple indoor sets and part flow arrangement, the part flow arrangement include First Heat Exchanger, the first heat exchange of the First Heat Exchanger
The entrance of stream is connected with the high-pressure liquid tube of the outdoor unit, the First Heat Exchanger first heat exchange stream outlet with it is described
Each indoor set in multiple indoor sets is connected, and the entrance of the second heat exchange stream of the First Heat Exchanger is by being subcooled return valve
Body is connected with the first outlet for exchanging heat stream of the First Heat Exchanger, the outlet of the second heat exchange stream of the First Heat Exchanger
It is connected with the low pressure gas pipe of the outdoor unit, the control method comprises the following steps：
When the multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, the First Heat Exchanger is obtained
The second heat exchange stream outlet superheat degree, and according to the outlet superheat degree and current goal outlet superheat degree to the supercooling
The aperture of loop valve body is adjusted；
Whether judge in the multiple indoor set with the presence of indoor set cold medium shortage；
If the current goal outlet superheat degree heightened with the presence of indoor set cold medium shortage in the multiple indoor set,
And the aperture of the supercooling loop valve body is adjusted according to the target outlet degree of superheat after regulation and the outlet superheat degree.
2. the control method of loop valve body is subcooled in multiple on-line system as claimed in claim 1, it is characterised in that if described
The current goal outlet superheat degree is not controlled then to keep constant with the presence of indoor set cold medium shortage in multiple indoor sets.
3. the control method of loop valve body is subcooled in multiple on-line system as claimed in claim 1, it is characterised in that if described
The aperture that indoor set time liquid and the restricting element of the indoor set in multiple indoor sets be present reaches default minimum allowable aperture, then
The current goal outlet superheat degree is turned down.
4. the control method of loop valve body is subcooled in the multiple on-line system as any one of claim 1-3, its feature exists
In described that the aperture of the supercooling loop valve body is adjusted according to the outlet superheat degree and current goal outlet superheat degree
Section, including：
If the outlet superheat degree is more than the current goal outlet superheat degree, the aperture of the supercooling loop valve body is adjusted
Greatly；
If the outlet superheat degree is less than the current goal outlet superheat degree, the aperture of the supercooling loop valve body is adjusted
It is small.
5. the control method of loop valve body is subcooled in multiple on-line system as claimed in claim 4, it is characterised in that also include：
Obtain the total load for the indoor set that freezes in the multiple indoor set and the capacity of the part flow arrangement；
The supercooling loop valve body is obtained according to the ratio of the total load of the refrigeration indoor set and the capacity of the part flow arrangement
Maximum allowable aperture, and make it is described supercooling loop valve body aperture be less than or equal to the maximum allowable aperture, wherein, it is described most
It is big to allow aperture and the ratio correlation.
6. a kind of computer-readable recording medium, it is characterised in that have and be stored in instruction therein, when the instruction is performed
When, the part flow arrangement performs the control that loop valve body is subcooled in the multiple on-line system as any one of claim 1-5
Method.
7. the control device of loop valve body is subcooled in a kind of multiple on-line system, it is characterised in that the multiple on-line system includes room
Outer machine, multiple indoor sets and part flow arrangement, the part flow arrangement include First Heat Exchanger, the first heat exchange of the First Heat Exchanger
The entrance of stream is connected with the high-pressure liquid tube of the outdoor unit, the First Heat Exchanger first heat exchange stream outlet with it is described
Each indoor set in multiple indoor sets is connected, and the entrance of the second heat exchange stream of the First Heat Exchanger is by being subcooled return valve
Body is connected with the first outlet for exchanging heat stream of the First Heat Exchanger, the outlet of the second heat exchange stream of the First Heat Exchanger
It is connected with the low pressure gas pipe of the outdoor unit, the control device includes：
First acquisition module, for when the multiple on-line system is run with pure refrigeration mode or hybrid refrigeration heating mode,
Obtain the outlet superheat degree of the second heat exchange stream of the First Heat Exchanger；
Control module, for being opened according to the outlet superheat degree and current goal outlet superheat degree the supercooling loop valve body
Degree is adjusted；
Judge module, for whether judging in the multiple indoor set with the presence of indoor set cold medium shortage；
The control module, it is additionally operable to when in the multiple indoor set with the presence of indoor set cold medium shortage, by the current mesh
Temperature of making a slip of the tongue is marked to heighten, and according to the target outlet degree of superheat after regulation and the outlet superheat degree to the supercooling return valve
The aperture of body is adjusted.
8. the control device of loop valve body is subcooled in multiple on-line system as claimed in claim 7, it is characterised in that if described
Not with the presence of indoor set cold medium shortage in multiple indoor sets, the control module then controls the current goal outlet superheat degree to protect
Hold constant.
9. the control device of loop valve body is subcooled in multiple on-line system as claimed in claim 7, it is characterised in that if described
The aperture that indoor set time liquid and the restricting element of the indoor set in multiple indoor sets be present reaches default minimum allowable aperture, institute
Control module is stated then to turn down the current goal outlet superheat degree.
10. the control device of loop valve body is subcooled in multiple on-line system as claimed in any one of claims 7-9, its feature exists
In the control module is according to the outlet superheat degree and current goal outlet superheat degree to the aperture that loop valve body is subcooled
When being adjusted, wherein,
If the outlet superheat degree is more than the current goal outlet superheat degree, the control module then crosses cold loop by described
The aperture of valve body tunes up；
If the outlet superheat degree is less than the current goal outlet superheat degree, the control module then crosses cold loop by described
The aperture of valve body is turned down.
11. the control device of loop valve body is subcooled in multiple on-line system as claimed in claim 10, it is characterised in that also wrap
Include：
Second acquisition module, for obtaining the total load for the indoor set that freezes in the multiple indoor set and the appearance of the part flow arrangement
Amount；
The control module, it is additionally operable to be obtained according to the ratio of the total load and the capacity of the part flow arrangement of the refrigeration indoor set
The maximum allowable aperture of the supercooling loop valve body is taken, and the aperture of the supercooling loop valve body is less than or equal to the maximum and permits
Perhaps aperture, wherein, the maximum allowable aperture and the ratio correlation.
12. a kind of multiple on-line system, it is characterised in that including the supercooling loop valve body as any one of claim 7-11
Control device.
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| CN201710697630.2A CN107559953B (en) | 2017-08-15 | 2017-08-15 | Multi-split air conditioning system and control method and device of supercooling loop valve body thereof |
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| CN201710697630.2A CN107559953B (en) | 2017-08-15 | 2017-08-15 | Multi-split air conditioning system and control method and device of supercooling loop valve body thereof |
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| CN110017592A (en) * | 2019-03-11 | 2019-07-16 | 广东美的暖通设备有限公司 | Multi-connected machine control method, device and equipment |
| CN110131838A (en) * | 2019-05-17 | 2019-08-16 | 珠海格力电器股份有限公司 | Air conditioning unit control method and device, computer equipment and storage medium |
| CN111928410A (en) * | 2020-06-30 | 2020-11-13 | 青岛海尔空调电子有限公司 | Control method for multi-split air conditioning unit |
| CN112033040A (en) * | 2020-09-15 | 2020-12-04 | 广东美的暖通设备有限公司 | Air conditioning system, control method of air conditioning system, and computer-readable storage medium |
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| CN107559953B (en) | 2020-02-04 |
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