CN107560215B - Multi-line system and its control method and device that circuit valve body is subcooled - Google Patents
Multi-line system and its control method and device that circuit valve body is subcooled Download PDFInfo
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- CN107560215B CN107560215B CN201710698388.0A CN201710698388A CN107560215B CN 107560215 B CN107560215 B CN 107560215B CN 201710698388 A CN201710698388 A CN 201710698388A CN 107560215 B CN107560215 B CN 107560215B
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Abstract
The invention discloses a kind of multi-line system and its control methods and device of supercooling circuit valve body, it the described method comprises the following steps: when multi-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, aperture being allowed according to the initial maximum of the total load of refrigeration indoor unit and the procurement of reserve capacity supercooling circuit valve body of part flow arrangement；The outlet superheat degree of the second heat exchange flow path of First Heat Exchanger is obtained, and allows aperture that the aperture of supercooling circuit valve body is adjusted according to outlet superheat degree, the preset target outlet degree of superheat and initial maximum；It is delayed after the first preset time, aperture is allowed to be adjusted initial maximum according to the pressure difference value between the entrance and outlet of the indoor unit that freezes in multiple indoor units, the problems such as being adjusted according to aperture of maximum allowable aperture, outlet superheat degree and the preset target outlet degree of superheat after adjusting to supercooling circuit valve body, occurring cold medium shortage, bias current so as to the indoor unit that avoids freezing under the premise of realizing supercooling and return liquid.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to the controlling party of circuit valve body is subcooled in a kind of multi-line system
Method, a kind of computer readable storage medium, the control device and a kind of multi-connected machine that circuit valve body is subcooled in a kind of multi-line system
System.
Background technique
In general, the part flow arrangement of multi-line system is arranged in liquid pipe, and it is subcooled on flow path and crosses low temperature valve using overheat
Degree control, to realize the supercooling of main road refrigerant.
In practical applications, in order to save installation cost, the indoor unit 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 range taken into account of type selecting it is larger, when the part flow arrangement connection of large capacity is less
Indoor unit or system when there was only operation at part load, if the aperture for crossing low temperature valve is excessive, be easy to cause refrigeration indoor unit
Cold medium shortage or bias current (i.e. the cold medium shortage of part indoor unit).In addition it is biggish cross low temperature valve big aperture Smaller load when
It waits, is easy to appear refrigerant and returns liquid, while also will increase unnecessary refrigerant hydrodynamic noise.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, the first purpose of this invention is to propose that the controlling party of circuit valve body is subcooled in a kind of multi-line system
Method can avoid large capacity part flow arrangement from connecting and there was only part in less indoor unit or system under the premise of realizing supercooling
Caused refrigeration indoor unit cold medium shortage or bias current when load operation, or return liquid the problems such as.
Second object of the present invention is to propose a kind of computer readable storage medium.
Third object of the present invention is to propose that the control device of circuit valve body is subcooled in a kind of multi-line system.
Fourth object of the present invention is to propose a kind of multi-line system.
In order to achieve the above objectives, first aspect present invention embodiment, which proposes, is subcooled circuit valve body in a kind of multi-line system
Control method, the multi-line system includes outdoor unit, multiple indoor units and part flow arrangement, and the part flow arrangement includes first
The entrance of heat exchanger, the first heat exchange flow path of the First Heat Exchanger is connected with the high-pressure liquid tube of the outdoor unit, and described first
The outlet of first heat exchange flow path of heat exchanger is connected with each indoor unit in the multiple indoor unit, the First Heat Exchanger
The entrance of second heat exchange flow path is connected by supercooling circuit valve body with the outlet of the first heat exchange flow path of the First Heat Exchanger, institute
State First Heat Exchanger second heat exchange flow path outlet be connected with the low-pressure air pipe of the outdoor unit, the control method include with
Lower step: when the multi-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, the multiple room is obtained
Freeze the total load of indoor unit and the capacity of the part flow arrangement in interior machine, and according to the total load of the refrigeration indoor unit and institute
State the initial maximum permission aperture that circuit valve body is subcooled described in the procurement of reserve capacity of part flow arrangement；Obtain the of the First Heat Exchanger
The outlet superheat degree of two heat exchange flow paths, and according to the outlet superheat degree, the preset target outlet degree of superheat and it is described it is initial most
It is big to allow aperture that the aperture of the supercooling circuit valve body is adjusted；It is delayed after the first preset time, obtains the multiple room
Pressure difference value in interior machine between the entrance and outlet of refrigeration indoor unit, and the initial maximum is permitted according to the pressure difference value
Perhaps aperture is adjusted, and is gone out according to maximum allowable aperture, the outlet superheat degree and the preset target after adjusting
The aperture of the supercooling circuit valve body is adjusted in temperature of making a slip of the tongue.
The control method of circuit valve body is subcooled in multi-line system according to an embodiment of the present invention, when multi-line system is with pure
When refrigeration mode or hybrid refrigeration heating mode are run, the total load for the indoor unit that freezes in multiple indoor units is obtained first and is divided
Flow the capacity of device, and according to the procurement of reserve capacity supercooling circuit valve body of the total load of refrigeration indoor unit and part flow arrangement it is initial most
It is big to allow aperture, then obtain the outlet superheat degree of the second heat exchange flow path of First Heat Exchanger, and according to outlet superheat degree, default
The target outlet degree of superheat and initial maximum allow aperture to it is described supercooling circuit valve body aperture be adjusted.Delay first is pre-
If after the time, obtaining the pressure difference value between the entrance and outlet for the indoor unit that freezes in multiple indoor units, and according to pressure difference value
Aperture is allowed to be adjusted initial maximum, and according to maximum allowable aperture, outlet superheat degree and the preset mesh after adjusting
Temperature of making a slip of the tongue is marked the aperture of supercooling circuit valve body is adjusted.This method can avoid big under the premise of realizing supercooling
Capacity part flow arrangement connects in less indoor unit or system when only operation at part load caused refrigeration indoor-unit cooling-medium not
Foot or bias current, or return liquid the problems such as.
In addition, the control method that circuit valve body is subcooled in the multi-line system proposed according to that above embodiment of the present invention may be used also
To have following additional technical characteristic:
According to one embodiment of present invention, according to the capacity of the total load of the refrigeration indoor unit and the part flow arrangement
Ratio obtain the initial maximum of the supercooling circuit valve body and allow aperture, wherein the initial maximum allow aperture with it is described
Ratio correlation.
According to one embodiment of present invention, the entrance for obtaining the indoor unit that freezes in the multiple indoor unit and outlet
Between pressure difference value, comprising: obtain the First Heat Exchanger first heat exchange flow path exit pressure, be denoted as the first pressure
Power, and the pressure in the exit of the second heat exchange flow path of the First Heat Exchanger is obtained, it is denoted as second pressure；Calculate described first
Pressure difference value between pressure and the second pressure is to obtain the entrance of refrigeration indoor unit and outlet in the multiple indoor unit
Between pressure difference value.
According to one embodiment of present invention, described to allow aperture to carry out the initial maximum according to the pressure difference value
It adjusts, comprising: judge whether the pressure difference value is less than preset pressure threshold；If the pressure difference value is less than described default
Pressure threshold, then by the initial maximum permission aperture turn down, until the pressure difference value be more than or equal to the preset pressure
When force threshold, stop allowing aperture to be adjusted the initial maximum.
According to one embodiment of present invention, the maximum allowable aperture according to after adjusting, the outlet superheat degree and
The aperture of the supercooling circuit valve body is adjusted in the preset target outlet degree of superheat, comprising: if described go out to make a slip of the tongue
Temperature is greater than the preset target outlet degree of superheat, then tunes up the aperture of the supercooling circuit valve body, and make the supercooling
The aperture of circuit valve body is less than or equal to the maximum allowable aperture；Go out if the outlet superheat degree is less than the preset target
It makes a slip of the tongue temperature, then turns the aperture of the supercooling circuit valve body down.
To achieve the above object, second aspect of the present invention embodiment proposes a kind of computer readable storage medium, has
It is stored in instruction therein, when executed, the part flow arrangement executes to be subcooled back in above-mentioned multi-line system
The control method of road valve body.
Computer readable storage medium according to an embodiment of the present invention is subcooled back by executing in above-mentioned multi-line system
The control method of road valve body, can under the premise of realizing supercooling, avoid large capacity part flow arrangement connect less indoor unit or
Caused refrigeration indoor unit cold medium shortage or bias current when there was only operation at part load in system, or the problems such as time liquid.
To achieve the above object, third aspect present invention embodiment, which proposes, is subcooled circuit valve body in a kind of multi-line system
Control device, the multi-line system includes outdoor unit, multiple indoor units and part flow arrangement, and the part flow arrangement includes first
The entrance of heat exchanger, the first heat exchange flow path of the First Heat Exchanger is connected with the high-pressure liquid tube of the outdoor unit, and described first
The outlet of first heat exchange flow path of heat exchanger is connected with each indoor unit in the multiple indoor unit, the First Heat Exchanger
The entrance of second heat exchange flow path is connected by supercooling circuit valve body with the outlet of the first heat exchange flow path of the First Heat Exchanger, institute
The outlet for stating the second heat exchange flow path of First Heat Exchanger is connected with the low-pressure air pipe of the outdoor unit, and the control device includes:
First obtains module, for obtaining when the multi-line system is run with pure refrigeration mode or hybrid refrigeration heating mode
Total load, the capacity of the part flow arrangement and the second of the First Heat Exchanger of refrigeration indoor unit are changed in the multiple indoor unit
The outlet superheat degree of hot flowpath；Second obtains module, for the total load and the part flow arrangement according to the refrigeration indoor unit
Procurement of reserve capacity described in supercooling circuit valve body initial maximum allow aperture；Control module, for according to the outlet superheat degree,
The preset target outlet degree of superheat and the initial maximum allow aperture that the aperture of the supercooling circuit valve body is adjusted, and
After first preset time that is delayed, the entrance for the indoor unit that freezes in the multiple indoor unit is obtained by the first acquisition module
Pressure difference value between outlet, and allow aperture to be adjusted the initial maximum according to the pressure difference value, Yi Jigen
Cold loop is crossed to described according to maximum allowable aperture, the outlet superheat degree and the preset target outlet degree of superheat after adjusting
The aperture of valve body is adjusted.
The control device of circuit valve body is subcooled in multi-line system according to an embodiment of the present invention, when multi-line system is with pure
When refrigeration mode or hybrid refrigeration heating mode are run, module is obtained by first first and obtains cool room in multiple indoor units
The outlet superheat degree of second heat exchange flow path of the total load of interior machine, the capacity of part flow arrangement and First Heat Exchanger, then, second obtains
Modulus root tuber allows out according to the initial maximum of the total load of refrigeration indoor unit and the procurement of reserve capacity supercooling circuit valve body of part flow arrangement
Degree.Last control module allows aperture to being subcooled back according to outlet superheat degree, the preset target outlet degree of superheat and initial maximum
The aperture of road valve body is adjusted, and after first preset time that is delayed, and obtains module by first and obtains in multiple indoor units
Pressure difference value between the entrance and outlet of refrigeration indoor unit, and allow aperture to adjust initial maximum according to pressure difference value
Section, and according to maximum allowable aperture, outlet superheat degree and the preset target outlet degree of superheat after adjusting to supercooling return valve
The aperture of body is adjusted.The device can avoid large capacity part flow arrangement from connecting less interior under the premise of realizing supercooling
Machine perhaps in system only operation at part load when caused refrigeration indoor unit cold medium shortage or bias current or the problems such as time liquid.
In addition, the control device that circuit valve body is subcooled in the multi-line system proposed according to that above embodiment of the present invention may be used also
With following additional technical characteristic:
According to one embodiment of present invention, described second total load and institute of the module according to the refrigeration indoor unit are obtained
The ratio for stating the capacity of part flow arrangement, which obtains the initial maximum of the supercooling circuit valve body, allows aperture, wherein it is described it is initial most
It is big to allow aperture and the ratio correlation.
According to one embodiment of present invention, the first acquisition module is in obtaining the multiple indoor unit in cool room
When pressure difference value between the entrance and outlet of machine, wherein the first acquisition module obtains the first of the First Heat Exchanger
The pressure in the exit of heat exchange flow path, is denoted as first pressure, and obtains the outlet of the second heat exchange flow path of the First Heat Exchanger
The pressure at place, is denoted as second pressure；The first acquisition module calculates the pressure between the first pressure and the second pressure
Pressure difference value between entrance and outlet of the power difference to obtain the indoor unit that freezes in the multiple indoor unit.
According to one embodiment of present invention, the control module is permitting the initial maximum according to the pressure difference value
Perhaps when aperture is adjusted, wherein the control module judges whether the pressure difference value is less than preset pressure threshold；If
The pressure difference value is less than the preset pressure threshold, and the control module then turns down initial maximum permission aperture,
Until stopping allowing aperture to adjust the initial maximum when pressure difference value is more than or equal to the preset pressure threshold
Section.
According to one embodiment of present invention, the control module according to after adjusting maximum allowable aperture, it is described go out
When the aperture of the supercooling circuit valve body is adjusted in temperature of making a slip of the tongue and the preset target outlet degree of superheat, wherein such as
Outlet superheat degree described in fruit is greater than the preset target outlet degree of superheat, and the control module is then by supercooling circuit valve body
Aperture tune up, and make it is described supercooling circuit valve body aperture be less than or equal to the maximum allowable aperture；If described go out to make a slip of the tongue
Temperature is less than the preset target outlet degree of superheat, and the control module then turns the aperture of the supercooling circuit valve body down.
To achieve the above object, fourth aspect present invention embodiment proposes a kind of multi-line system comprising above-mentioned
The control device of circuit valve body is subcooled.
The multi-line system of the embodiment of the present invention can realized by the control device of above-mentioned supercooling circuit valve body
Under the premise of supercooling, avoid causing when there was only operation at part load in the less indoor unit of large capacity part flow arrangement connection or system
Refrigeration indoor unit cold medium shortage or bias current, or return liquid the problems such as.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of multi-line system according to an embodiment of the invention；
Fig. 2 is refrigerant flow graph when multi-line system according to an embodiment of the invention is in pure refrigeration mode；
When Fig. 3 is that multi-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 that the control method of circuit valve body is subcooled in multi-line system according to an embodiment of the present invention；
Fig. 5 is the ratio and mistake of the capacity of the total load and part flow arrangement of refrigeration indoor unit according to an embodiment of the present invention
The initial maximum of cold loop valve body allows the relation schematic diagram of aperture；And
Fig. 6 is the box signal that the control device of circuit valve body is subcooled in multi-line system according to an embodiment of the present invention
Figure.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The controlling party of circuit valve body is subcooled in the multi-line system to describe proposition of the embodiment of the present invention with reference to the accompanying drawing
Method, computer readable storage medium the control device of circuit valve body are subcooled in multi-line system and with the more of the control device
On-line system.
In an embodiment of the present invention, multi-line system may include outdoor unit, multiple indoor units and part flow arrangement, shunt dress
Setting may include First Heat Exchanger, and the entrance of the first heat exchange flow path of First Heat Exchanger is connected with the high-pressure liquid tube of outdoor unit, first
The outlet of first heat exchange flow path of heat exchanger is connected with each indoor unit in multiple indoor units, the second heat exchange of First Heat Exchanger
The entrance of flow path is connected by the outlet of the first heat exchange flow path of supercooling circuit valve body and First Heat Exchanger, and the of First Heat Exchanger
The outlet of two heat exchange flow paths is connected with the low-pressure air pipe of outdoor unit.
Specifically, as shown in Figure 1, multi-line system may include outdoor unit 10, multiple indoor units 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, third 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 is logical
It crosses the second four-way valve ST2 to be connected with one end of the second outdoor heat exchanger 12, 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 third 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, third four-way valve ST3 and low-pressure air pipe.
Multiple indoor units 20 may include first to fourth indoor unit.Wherein, the first indoor unit includes the first indoor heat exchanger
The 21 and first indoor restricting element EXV1, the second indoor unit includes restricting element in the second indoor heat exchanger 22 and second Room
EXV2, third indoor unit include restricting element EXV3 in third indoor heat exchanger 23 and third room, 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 circuit valve body EV, multiple heating check valves 311,312,313
With 314, multiple refrigeration check valves 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 of the first heat exchange flow path of First Heat Exchanger 31 and outdoor unit 10
Hydraulic fluid pipe is connected, and the outlet of the first heat exchange flow path of First Heat Exchanger 31 is connected with each indoor unit in multiple indoor units 20,
The entrance of second heat exchange flow path of First Heat Exchanger 31 is flowed by the first heat exchange of supercooling circuit valve body EV and First Heat Exchanger 31
The outlet on road is connected, and the outlet of the second heat exchange flow path of First Heat Exchanger 31 is connected with the low-pressure air pipe of outdoor unit 10.Wherein,
First heat exchange flow path of one heat exchanger 31 is the main road of part flow arrangement 30, and the second heat exchange flow path of First Heat Exchanger 31 is to shunt dress
Set 30 cooling circuit again.Circuit valve body EV, which is subcooled, to be electric expansion valve, and First Heat Exchanger 31 can be plate heat exchanger.
Heat exchanger 24 in first indoor heat exchanger 21, the second indoor heat exchanger 22, third indoor heat exchanger 23 and fourth ventricle
One end pass through corresponding multiple heating on-off valves 331,332,333 and 334 respectively and be connected with high-pressure air pipe, the first indoor heat exchange
One end of heat exchanger 24 also passes through correspondence respectively in device 21, the second indoor heat exchanger 22, third indoor heat exchanger 23 and fourth ventricle
Multiple refrigeration on-off valves 341,342,343 and 344 be connected with low-pressure air pipe, heat exchange in the first indoor heat exchanger 21, second Room
In device 22, third indoor heat exchanger 23 and fourth ventricle the other end of heat exchanger 24 respectively with corresponding first indoor restricting element
Restricting element EXV2 in EXV1, second Room, in third room in restricting element EXV3 and fourth ventricle restricting element EXV4 one end phase
Even, the first indoor restricting element EXV1, restricting element EXV2 in second Room, restricting element EXV3 and fourth ventricle internal segment in third room
The other end of fluid element EXV4 passes through corresponding multiple heating check valves 311,312,313 and 314 respectively and is connected with high-pressure liquid tube,
Restricting element EXV2 in first indoor restricting element EXV1, second Room, throttling in restricting element EXV3 and fourth ventricle in third room
The other end of element EXV4 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 flow path is connected.
When multi-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 is directly connected to the second outdoor heat exchanger 12.Wherein, first
Outdoor heat exchanger 11 and the second outdoor heat exchanger 12 are used as condenser.At this point, the high temperature being discharged from the exhaust outlet of compressor 13
High-pressure gaseous refrigerant is divided into two-way: flowing to the first outdoor heat exchanger 11 after the first four-way valve ST1 all the way, becomes after condensing heat release
At high temperature and pressure liquid refrigerant, enter high-pressure liquid tube after the first outdoor restricting element EXVA throttling；Another way passes through the two or four
The second outdoor heat exchanger 12 is flowed to after port valve ST2, becomes high temperature and pressure liquid refrigerant after condensing heat release, through the member that throttles outside second Room
Enter high-pressure liquid tube after part EXVB throttling.After two-way refrigerant converges, a part in refrigerant passes through the first of First Heat Exchanger 31
It exchanges heat after flow path, distributes to corresponding first to fourth indoor unit by multiple refrigeration check valves 321,322,323 and 324, pass through
After entering first to fourth indoor heat exchanger evaporation endothermic after the restricting element of first to fourth indoor unit, become medium temperature low pressure gas
The medium temperature low-pressure gaseous refrigerant of state refrigerant, first to fourth indoor unit passes through multiple refrigeration corresponding with first to fourth indoor unit
On-off valve 341,342,343 and 344 merges in low-pressure air pipe；Another part enters after supercooling circuit valve body EV throttling
Second heat exchange flow path, second heat exchange flow path absorb first heat exchange flow path in refrigerant heat after, become low-pressure gaseous refrigerant, enter
Low-pressure air pipe.Refrigerant in low-pressure air pipe flows back to the gas returning port of compressor 13 by outdoor gas-liquid separator 14.
When multi-line system is with hybrid refrigeration heating mode (including main heating mode or main refrigeration mode) operation, 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 unit and the
Four indoor units are refrigeration indoor unit, and the second indoor unit and third indoor unit are heating indoor unit.At this point, 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 high temperature and pressure liquid refrigerant after condensation heat release, enters high-pressure liquid tube after restricting element EXVB throttling outside second Room；It is another
Road is by third four-way valve ST3 and heating on-off valve 332 and 333 corresponding with the second heating indoor unit and third indoor unit
Afterwards, it into the second heating indoor unit and third indoor unit indoor heat exchanger, exchanges heat in the second indoor heat exchanger 22 and third room
Device 23 becomes medium temperature low-pressure gaseous refrigerant after condensing heat release, then through by saving in restricting element EXV2 in second Room and third room
After fluid element EXV3 reducing pressure by regulating flow, enter high-pressure liquid tube through heating check valve 312 and 313.The refrigerant one flowed out from high-pressure liquid tube
Part enter First Heat Exchanger 31, into the first indoor heat exchanger refrigerant all the way pass through refrigeration check valve 321 and 324 respectively into
Enter machine in the first indoor unit and fourth ventricle, after machine evaporation endothermic in the first indoor unit and fourth ventricle, become middle pressure gaseous coolant,
Enter low-pressure air pipe through corresponding refrigeration on-off valve 341 and 344, another way is by supercooling circuit valve body EV by the second heat exchange stream
Road enters low-pressure air pipe, and the refrigerant for collecting in low-pressure air pipe flows back to the gas returning port of compressor 13 by outdoor gas-liquid separator 14；
Another part enters the first outdoor heat exchanger 11 in outdoor unit 10, after 11 evaporation endothermic of the first outdoor heat exchanger, passes through
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 that the control method of circuit valve body is subcooled in multi-line system according to an embodiment of the present invention.Such as
Shown in Fig. 4, the control method that circuit valve body is subcooled in the multi-line system of the embodiment of the present invention be can comprise the following steps that
S1 obtains multiple indoor units when multi-line system is run with pure refrigeration mode or hybrid refrigeration heating mode
The total load of middle refrigeration indoor unit and the capacity of part flow arrangement, and according to the capacity of the total load of refrigeration indoor unit and part flow arrangement
The initial maximum for obtaining supercooling circuit valve body allows aperture.
Wherein, the capacity of part flow arrangement is the maximum value that indoor unit capability is connect with part flow arrangement, for example, part flow arrangement
Capacity can be determined by the design object and hardware of multi-line system.
According to one embodiment of present invention, it is obtained according to the ratio of the total load of refrigeration indoor unit and the capacity of part flow arrangement
Taking the initial maximum of supercooling circuit valve body allows aperture, wherein initial maximum allows aperture and ratio correlation.
Specifically, as shown in figure 5, with refrigeration indoor unit total load and part flow arrangement capacity ratio increase,
The initial maximum that circuit valve body is subcooled allows aperture to increase, and physical relationship curve can be obtained by experiment test.Wherein, work as refrigeration
When the ratio of the capacity of the total load and part flow arrangement of indoor unit is 1, the initial maximum of supercooling circuit valve body allows aperture to be complete
Open state.
S2 obtains the outlet superheat degree of the second heat exchange flow path of First Heat Exchanger, and according to outlet superheat degree, preset mesh
Marking make a slip of the tongue temperature and initial maximum allows aperture that the aperture of supercooling circuit valve body is adjusted.Wherein, preset target goes out
Temperature of making a slip of the tongue can be demarcated according to the actual situation.
Specifically, after the initial maximum for obtaining supercooling circuit valve body allows aperture, by the way that First Heat Exchanger is arranged in
The temperature sensor (such as temperature sensing package) and pressure sensor in the exit of the second heat exchange flow path obtain the second heat exchange flow path respectively
The temperature Tout and pressure PL in exit, and the second heat exchange flow path of First Heat Exchanger is calculated according to temperature Tout and pressure PL
Outlet superheat degree DSH=Tout-T, wherein T is the corresponding saturation temperature of pressure PL.Then, according to the outlet superheat degree DSH with
Size relation between preset target outlet degree of superheat DSHm is adjusted the aperture of supercooling circuit valve body, for example, working as
When DSH > DSHm, the aperture that circuit valve body is subcooled is tuned up, to reduce outlet superheat degree DSH, as DSH < DSHm, will be subcooled
The aperture of circuit valve body is turned down, to increase outlet superheat degree DSH.
S3, be delayed the first preset time after, obtain in multiple indoor units freeze indoor unit entrance and outlet between pressure
Power difference, and according to pressure difference value to initial maximum allow aperture be adjusted, and according to after adjusting maximum allowable aperture,
The aperture of supercooling circuit valve body is adjusted in outlet superheat degree and the preset target outlet degree of superheat.Wherein, first it is default when
Between can be demarcated according to the actual situation.
According to one embodiment of present invention, the pressure between the entrance and outlet for the indoor unit that freezes in multiple indoor units is obtained
Power difference, comprising: the pressure for obtaining the exit of the first heat exchange flow path of First Heat Exchanger is denoted as first pressure, and obtains the
The pressure in the exit of the second heat exchange flow path of one heat exchanger, is denoted as second pressure, then calculates first pressure and second pressure
Between pressure difference value with obtain in multiple indoor units freeze indoor unit entrance and outlet between pressure difference value.
Further, according to one embodiment of present invention, aperture is allowed to adjust initial maximum according to pressure difference value
Section, comprising: judge whether pressure difference value is less than preset pressure threshold；If pressure difference value is less than preset pressure threshold,
Initial maximum permission aperture is turned down, until stopping permitting initial maximum when pressure difference value is more than or equal to preset pressure threshold
Perhaps aperture is adjusted.Wherein, preset pressure threshold can be demarcated according to the actual situation.
According to one embodiment of present invention, according to maximum allowable aperture, outlet superheat degree and the preset mesh after adjusting
It marks temperature of making a slip of the tongue the aperture of supercooling circuit valve body is adjusted, comprising: if outlet superheat degree is greater than preset target and goes out
It makes a slip of the tongue temperature, then tunes up the aperture that circuit valve body is subcooled, and the aperture that circuit valve body is subcooled is made to be less than or equal to maximum allowable open
Degree turns the aperture that circuit valve body is subcooled down if outlet superheat degree is less than the preset target outlet degree of superheat.
Specifically, according to outlet superheat degree DSH and preset target outlet degree of superheat DSHm to supercooling circuit valve body
During aperture is adjusted, can every the first preset time by obtain First Heat Exchanger first heat exchange flow path go out
The pressure PL in the exit of the second heat exchange flow path of pressure PH and First Heat Exchanger at mouthful calculates cool room in multiple indoor units
Then the front and back pressure difference (PH-PL) of interior machine allows aperture to be adjusted initial maximum according to the front and back pressure difference.Wherein, if
Front and back difference is less than preset pressure threshold, then be easy to cause cold medium shortage or the bias current of refrigeration indoor unit, or returns liquid, at this time
Initial maximum permission aperture is turned down, and according to maximum allowable aperture, outlet superheat degree and the preset target superheat after adjusting
It spends and the aperture of supercooling circuit valve body is adjusted, during adjusting, even if there is the case where DSH > DSHm, but most
Under the big limitation for allowing aperture, the aperture that circuit valve body is subcooled will also reduce, and the front and back pressure difference for the indoor unit that freezes will increase, thus
Effectively prevent the problems such as refrigeration indoor unit cold medium shortage, bias current occurs and returns liquid.
Therefore, the control method of circuit valve body is subcooled in the multi-line system of the embodiment of the present invention, before realizing supercooling
It puts, can be avoided large capacity part flow arrangement and connect in less indoor unit or system caused system when there was only operation at part load
Cold indoor unit cold medium shortage or bias current, or return liquid the problems such as.
In conclusion the control method of circuit valve body is subcooled in multi-line system according to an embodiment of the present invention, when multi-joint
When machine system is run with pure refrigeration mode or hybrid refrigeration heating mode, the indoor unit that freezes in multiple indoor units is obtained first
The capacity of total load and part flow arrangement, and return valve is subcooled according to the total load of refrigeration indoor unit and the procurement of reserve capacity of part flow arrangement
The initial maximum of body allows aperture, then obtains the outlet superheat degree of the second heat exchange flow path of First Heat Exchanger, and according to outlet
The degree of superheat, the preset target outlet degree of superheat and initial maximum allow aperture to adjust the aperture of the supercooling circuit valve body
Section.It is delayed after the first preset time, obtains the pressure difference value between the entrance and outlet for the indoor unit that freezes in multiple indoor units, and
Aperture is allowed to be adjusted initial maximum according to pressure difference value, and according to the maximum allowable aperture after adjusting, outlet superheat
The aperture of supercooling circuit valve body is adjusted in degree and the preset target outlet degree of superheat.This method can be before realizing supercooling
It puts, large capacity part flow arrangement is avoided to connect in less indoor unit or system caused cool room when there was only operation at part load
Interior machine cold medium shortage or bias current, or return liquid the problems such as.
In addition, the embodiment of the present invention also proposed a kind of computer readable storage medium, it is therein with being stored in
Instruction, when executed, part flow arrangement execute the control method that circuit valve body is subcooled in above-mentioned multi-line system.
Computer readable storage medium according to an embodiment of the present invention is subcooled back by executing in above-mentioned multi-line system
The control method of road valve body avoids large capacity part flow arrangement from connecting less indoor unit or system under the premise of realizing supercooling
In only operation at part load when caused refrigeration indoor unit cold medium shortage or bias current, or the problems such as time liquid.
The control device that circuit valve body is subcooled in the multi-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, multi-line system includes outdoor unit 10, multiple indoor units 20 and divides
Device 30 is flowed, part flow arrangement 30 includes First Heat Exchanger 31, the entrance and outdoor unit of the first heat exchange flow path of First Heat Exchanger 31
10 high-pressure liquid tube is connected, the outlet of the first heat exchange flow path of First Heat Exchanger 31 and each indoor unit in multiple indoor units 20
It is connected, the entrance of the second heat exchange flow path of First Heat Exchanger 31 is changed by the way that circuit 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 flow path of First Heat Exchanger 31 is connected with the low-pressure air pipe of outdoor unit 10.
Fig. 6 is the box signal that the control device of circuit valve body is subcooled in multi-line system according to an embodiment of the present invention
Figure.As shown in fig. 6, the control device of circuit valve body is subcooled in the multi-line system of the embodiment of the present invention can include: first obtains
Module 100, second obtains module 200 and control module 300.
Wherein, first module 100 is obtained for when multi-line system is with pure refrigeration mode or hybrid refrigeration heating mode
When operation, the of the total load of indoor unit of freezing in multiple indoor units, the capacity of part flow arrangement 30 and First Heat Exchanger 31 is obtained
The outlet superheat degree of two heat exchange flow paths.Second obtains module 200 for the total load and part flow arrangement 30 according to refrigeration indoor unit
Procurement of reserve capacity supercooling circuit valve body EV initial maximum allow aperture.Control module 300 is used for according to outlet superheat degree, presets
The target outlet degree of superheat and initial maximum allow aperture to supercooling circuit valve body EV aperture be adjusted, and delay first
After preset time, the pressure between the entrance and outlet for the indoor unit that freezes in multiple indoor units is obtained by the first acquisition module 100
Power difference, and according to pressure difference value to initial maximum allow aperture be adjusted, and according to after adjusting maximum allowable aperture,
The aperture of supercooling circuit valve body EV is adjusted in outlet superheat degree and the preset target outlet degree of superheat.
According to one embodiment of present invention, second module 200 is obtained according to the total load of refrigeration indoor unit and shunts dress
Set 30 capacity ratio obtain supercooling circuit valve body EV initial maximum allow aperture, wherein initial maximum allow aperture with
Ratio correlation.
According to one embodiment of present invention, first the refrigeration indoor unit in obtaining multiple indoor units of module 100 is obtained
Entrance and outlet between pressure difference value when, wherein first obtain module 100 obtain First Heat Exchanger 31 first heat exchange flow path
Exit pressure, be denoted as first pressure, and obtain First Heat Exchanger 31 second heat exchange flow path exit pressure, note
For second pressure, first, which obtains module 100, calculates the pressure difference value between first pressure and second pressure to obtain multiple interiors
Pressure difference value in machine between the entrance and outlet of refrigeration indoor unit.
According to one embodiment of present invention, control module 300 according to pressure difference value to initial maximum allow aperture into
When row is adjusted, wherein control module 300 judges whether pressure difference value is less than preset pressure threshold, if pressure difference value is less than
Preset pressure threshold, control module 300 then turns down initial maximum permission aperture, until pressure difference value is more than or equal to preset
When pressure threshold, stop allowing aperture to be adjusted initial maximum.
According to one embodiment of present invention, control module 300 is according to the maximum allowable aperture after adjusting, outlet superheat
When the aperture of supercooling circuit valve body EV is adjusted in degree and the preset target outlet degree of superheat, wherein if outlet superheat degree
Greater than the preset target outlet degree of superheat, control module 300 then tunes up the aperture that circuit valve body is subcooled, and makes that return valve is subcooled
The aperture of body is less than or equal to maximum allowable aperture, if outlet superheat degree is less than the preset target outlet degree of superheat, control module
300 are turned down the aperture that circuit valve body EV is subcooled.
It is not disclosed it should be noted that being subcooled in the multi-line system of the embodiment of the present invention in the control device of circuit valve body
Details, please refer in the multi-line system of the embodiment of the present invention be subcooled circuit valve body control method disclosed in details,
It is specific which is not described herein again.
According to the control device that circuit valve body is subcooled in the multi-line system of the embodiment of the present invention, when multi-line system is with pure system
When cold mode or hybrid refrigeration heating mode are run, module is obtained by first first and is obtained in multiple indoor units in cool room
The outlet superheat degree of second heat exchange flow path of the total load of machine, the capacity of part flow arrangement and First Heat Exchanger, then, second obtains
Module allows aperture according to the initial maximum of the total load of refrigeration indoor unit and the procurement of reserve capacity supercooling circuit valve body of part flow arrangement.
Last control module allows aperture to supercooling return valve according to outlet superheat degree, the preset target outlet degree of superheat and initial maximum
The aperture of body is adjusted, and after first preset time that is delayed, and is obtained in multiple indoor units and is freezed by the first acquisition module
Pressure difference value between the entrance and outlet of indoor unit, and allow aperture to be adjusted initial maximum according to pressure difference value, with
And supercooling circuit valve body is opened according to maximum allowable aperture, outlet superheat degree and the preset target outlet degree of superheat after adjusting
Degree is adjusted.The device can under the premise of realizing supercooling, avoid large capacity part flow arrangement connect less indoor unit or
Caused refrigeration indoor unit cold medium shortage or bias current when there was only operation at part load in system, or the problems such as time liquid.
In addition, the embodiment of the present invention also proposed a kind of multi-line system comprising above-mentioned supercooling circuit valve body
Control device.
The multi-line system of the embodiment of the present invention can realized by the control device of above-mentioned supercooling circuit valve body
Under the premise of supercooling, avoid causing when there was only operation at part load in the less indoor unit of large capacity part flow arrangement connection or system
Refrigeration indoor unit cold medium shortage or bias current, or return liquid the problems such as.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In addition, in the description of the present invention, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ",
"upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " clockwise ", " inverse time
The orientation or positional relationship of the instructions such as needle ", " axial direction ", " radial direction ", " circumferential direction " is to be based on the orientation or positional relationship shown in the drawings,
Be merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
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 be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height 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 spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (12)
1. the control method of circuit valve body is subcooled in a kind of multi-line system, which is characterized in that the multi-line system includes room
Outer machine, multiple indoor units and part flow arrangement, the part flow arrangement include First Heat Exchanger, the first heat exchange of the First Heat Exchanger
The entrance of flow path is connected with the high-pressure liquid tube of the outdoor unit, the First Heat Exchanger first heat exchange flow path outlet with it is described
Each indoor unit in multiple indoor units is connected, and the entrance of the second heat exchange flow path of the First Heat Exchanger passes through supercooling return valve
Body is connected with the outlet of the first heat exchange flow path of the First Heat Exchanger, the outlet of the second heat exchange flow path of the First Heat Exchanger
Be connected with the low-pressure air pipe of the outdoor unit, the control method the following steps are included:
When the multi-line system is run with pure refrigeration mode or hybrid refrigeration heating mode, the multiple indoor unit is obtained
The total load of middle refrigeration indoor unit and the capacity of the part flow arrangement, and according to the total load of the refrigeration indoor unit and described point
The initial maximum for flowing supercooling circuit valve body described in the procurement of reserve capacity of device allows aperture；
The outlet superheat degree of the second heat exchange flow path of the First Heat Exchanger is obtained, and according to the outlet superheat degree, preset
The target outlet degree of superheat and the initial maximum allow aperture that the aperture of the supercooling circuit valve body is adjusted；
It is delayed after the first preset time, obtains the pressure difference between the entrance and outlet for the indoor unit that freezes in the multiple indoor unit
Value, and allow aperture to be adjusted the initial maximum according to the pressure difference value, and according to maximum allowable after adjusting
Aperture, the outlet superheat degree and the preset target outlet degree of superheat adjust the aperture of the supercooling circuit valve body
Section.
2. the control method of circuit valve body is subcooled in multi-line system as described in claim 1, which is characterized in that according to described
The initial maximum that the ratio of the capacity of the total load and part flow arrangement of refrigeration indoor unit obtains the supercooling circuit valve body permits
Perhaps aperture, wherein the initial maximum allows aperture and the ratio correlation.
3. the control method of circuit valve body is subcooled in multi-line system as claimed in claim 1 or 2, which is characterized in that described
Obtain the pressure difference value between the entrance and outlet for the indoor unit that freezes in the multiple indoor unit, comprising:
The pressure for obtaining the exit of the first heat exchange flow path of the First Heat Exchanger, is denoted as first pressure, and obtain described the
The pressure in the exit of the second heat exchange flow path of one heat exchanger, is denoted as second pressure；
The pressure difference value between the first pressure and the second pressure is calculated to obtain cool room in the multiple indoor unit
Pressure difference value between the entrance and outlet of interior machine.
4. the control method of circuit valve body is subcooled in multi-line system as claimed in claim 3, which is characterized in that the basis
The pressure difference value allows aperture to be adjusted the initial maximum, comprising:
Judge whether the pressure difference value is less than preset pressure threshold；
If the pressure difference value is less than the preset pressure threshold, initial maximum permission aperture is turned down, until
When the pressure difference value is more than or equal to the preset pressure threshold, stop allowing aperture to be adjusted the initial maximum.
5. the control method of circuit valve body is subcooled in multi-line system as claimed in claim 4, which is characterized in that the basis
Maximum allowable aperture, the outlet superheat degree and the preset target outlet degree of superheat after adjusting is to the supercooling return valve
The aperture of body is adjusted, comprising:
If the outlet superheat degree is greater than the preset target outlet degree of superheat, by the aperture of the supercooling circuit valve body
It tunes up, and the aperture of the supercooling circuit valve body is made to be less than or equal to the maximum allowable aperture；
If the outlet superheat degree is less than the preset target outlet degree of superheat, by the aperture of the supercooling circuit valve body
It turns down.
6. a kind of computer readable storage medium, which is characterized in that have and be stored in instruction therein, when described instruction is performed
When, the part flow arrangement executes the control that circuit valve body is subcooled in multi-line system according to any one of claims 1 to 5
Method.
7. the control device of circuit valve body is subcooled in a kind of multi-line system, which is characterized in that the multi-line system includes room
Outer machine, multiple indoor units and part flow arrangement, the part flow arrangement include First Heat Exchanger, the first heat exchange of the First Heat Exchanger
The entrance of flow path is connected with the high-pressure liquid tube of the outdoor unit, the First Heat Exchanger first heat exchange flow path outlet with it is described
Each indoor unit in multiple indoor units is connected, and the entrance of the second heat exchange flow path of the First Heat Exchanger passes through supercooling return valve
Body is connected with the outlet of the first heat exchange flow path of the First Heat Exchanger, the outlet of the second heat exchange flow path of the First Heat Exchanger
It is connected with the low-pressure air pipe of the outdoor unit, the control device includes:
First obtains module, is used for when the multi-line system is run with pure refrigeration mode or hybrid refrigeration heating mode,
Obtain the of the total load of indoor unit of freezing in the multiple indoor unit, the capacity of the part flow arrangement and the First Heat Exchanger
The outlet superheat degree of two heat exchange flow paths；
Second obtains module, for the mistake according to the procurement of reserve capacity of the total load of the refrigeration indoor unit and the part flow arrangement
The initial maximum of cold loop valve body allows aperture；
Control module, for being allowed out according to the outlet superheat degree, the preset target outlet degree of superheat and the initial maximum
It spends and the aperture of the supercooling circuit valve body is adjusted, and after first preset time that is delayed, obtain mould by described first
Block obtains the pressure difference value between the entrance and outlet of the indoor unit that freezes in the multiple indoor unit, and according to the pressure difference value
To the initial maximum allow aperture be adjusted, and according to after adjusting maximum allowable aperture, the outlet superheat degree and
The aperture of the supercooling circuit valve body is adjusted in the preset target outlet degree of superheat.
8. the control device of circuit valve body is subcooled in multi-line system as claimed in claim 7, which is characterized in that described second
Obtain module according to it is described refrigeration indoor unit total load and the part flow arrangement capacity ratio obtain it is described cross cold loop
The initial maximum of valve body allows aperture, wherein the initial maximum allows aperture and the ratio correlation.
9. the control device of circuit valve body is subcooled in multi-line system as claimed in claim 7 or 8, which is characterized in that described
First obtains module in the pressure difference value in the multiple indoor unit of acquisition between the entrance and outlet of refrigeration indoor unit,
In,
The first acquisition module obtains the pressure in the exit of the first heat exchange flow path of the First Heat Exchanger, is denoted as the first pressure
Power, and the pressure in the exit of the second heat exchange flow path of the First Heat Exchanger is obtained, it is denoted as second pressure；
It is described more to obtain that the first acquisition module calculates the pressure difference value between the first pressure and the second pressure
Pressure difference value in a indoor unit between the entrance and outlet of refrigeration indoor unit.
10. the control device of circuit valve body is subcooled in multi-line system as claimed in claim 9, which is characterized in that the control
Molding block according to the pressure difference value when allowing aperture to be adjusted the initial maximum, wherein
The control module judges whether the pressure difference value is less than preset pressure threshold；
If the pressure difference value is less than the preset pressure threshold, control module if, allows out the initial maximum
Degree is turned down, until stopping allows out the initial maximum when pressure difference value is more than or equal to the preset pressure threshold
Degree is adjusted.
11. the control device of circuit valve body is subcooled in multi-line system as claimed in claim 10, which is characterized in that the control
Molding block according to maximum allowable aperture, the outlet superheat degree and the preset target outlet degree of superheat after adjusting to institute
The aperture of supercooling circuit valve body is stated when being adjusted, wherein
If the outlet superheat degree is greater than the preset target outlet degree of superheat, control module if, is subcooled back described
The aperture of road valve body tunes up, and the aperture of the supercooling circuit valve body is made to be less than or equal to the maximum allowable aperture；
If the outlet superheat degree is less than the preset target outlet degree of superheat, control module if, is subcooled back described
The aperture of road valve body is turned down.
12. a kind of multi-line system, which is characterized in that including described in any item supercooling circuits valve body as claim in claims 7-11
Control device.
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| CN201710698388.0A CN107560215B (en) | 2017-08-15 | 2017-08-15 | Multi-line system and its control method and device that circuit valve body is subcooled |
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| CN109931677A (en) * | 2019-02-19 | 2019-06-25 | 广东美的暖通设备有限公司 | Interior machine crosses the control method and device of low temperature valve |
| CN110887265B (en) * | 2019-11-25 | 2021-01-12 | 珠海格力电器股份有限公司 | Internal circulation superposition heat pump system, control method and heat pump dryer |
| CN113587522B (en) * | 2021-07-26 | 2022-06-10 | 珠海格力电器股份有限公司 | Control method for avoiding low-temperature heating shutdown and refrigeration system |
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| CN201355152Y (en) * | 2008-11-12 | 2009-12-02 | 青岛海信日立空调系统有限公司 | Water-source variable-refrigerant-volume refrigeration system with subcooler control loop |
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| CN201355152Y (en) * | 2008-11-12 | 2009-12-02 | 青岛海信日立空调系统有限公司 | Water-source variable-refrigerant-volume refrigeration system with subcooler control loop |
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