CN105972860B - Multi-line system and its valve body control method for crossing cold loop - Google Patents
Multi-line system and its valve body control method for crossing cold loop Download PDFInfo
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- CN105972860B CN105972860B CN201610285059.9A CN201610285059A CN105972860B CN 105972860 B CN105972860 B CN 105972860B CN 201610285059 A CN201610285059 A CN 201610285059A CN 105972860 B CN105972860 B CN 105972860B
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- exchanging component
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- heat exchange
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of multi-line system and its valve body control methods of cold loop excessively, the described method comprises the following steps: obtaining the discharge superheat of compressor；When discharge superheat is less than the first preset value, if the outlet superheat degree of the second heat exchange flow path of the first heat-exchanging component is less than first outlet target superheat degree, aperture is carried out to second throttle and turns control down；When the aperture regulation of second throttle is to minimum aperture, if the outlet superheat degree of the second heat exchange flow path of the first heat-exchanging component is less than first outlet target superheat degree, then minimum aperture is carried out to turn amendment down, and continue to turn control down to second throttle progress aperture, until the discharge superheat of compressor is greater than the second preset value.This method is when compressor has back liquid risk, by adjusting the aperture of second throttle, not only excessive refrigerant can have been limited and returned to compressor, but also time liquid risk that the return-air degree of superheat reduces compressor can be improved, to improve the refrigeration effect of system and the safety of operation.
Description
Technical field
The present invention relates to the valve body control methods that cold loop is crossed in air-conditioning technical field more particularly to a kind of multi-line system
And a kind of multi-line system.
Background technique
The main refrigeration mode of multi-line system can simultaneously utilize system condensation heat and heat of evaporation, realize simultaneously refrigeration with
Heating, substantially increases system energy efficiency.In multi-line system, outdoor unit can be distributed liquid state refrigerant by part flow arrangement
To the indoor unit with different refrigeration, heating needs, wherein part flow arrangement was provided with cold loop.
When multi-line system is run with main refrigeration mode or pure refrigeration mode, when refrigeration indoor unit outlet superheat degree too
It is small, or supercooling circuit outlet refrigerant is more and the gas in the smaller exit to refrigeration indoor unit of outlet superheat degree generate compared with
When strong cooling effect, the air entry that the easy to carry liquid of return-air returns to compressor will lead to, at this time the discharge superheat of system
It is lower, to influence the safe operation of system.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose to cross the valve body control method of cold loop in a kind of multi-line system, and this method has back liquid wind in compressor
When dangerous, by adjusting second throttle aperture to suitable aperture, can not only limit excessive refrigerant and return to compressor, also
Time liquid risk that the return-air degree of superheat reduces compressor can be improved, to improve the refrigeration effect of system and the safety of operation.
It is another object of the present invention to propose a kind of multi-line system.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes the valve body that cold loop is crossed in a kind of multi-line system
Control method, the multi-line system include outdoor unit, part flow arrangement and multiple indoor units, and the outdoor unit includes compressor,
The part flow arrangement includes the first heat-exchanging component and the second heat-exchanging component, and the first heat exchange flow path of first heat-exchanging component goes out
First throttle valve is set between the entrance of first heat exchange flow path of mouth and second heat-exchanging component, second heat-exchanging component
Second throttle is set between the entrance of second heat exchange flow path of the outlet and second heat-exchanging component of the first heat exchange flow path, institute
The entrance for stating the outlet of the second heat exchange flow path of the second heat-exchanging component and the second heat exchange flow path of first heat-exchanging component is connected to,
The heat exchange flow path of first heat-exchanging component and the heat exchange flow path of second heat-exchanging component constitute the cold loop excessively, the side
Method is the following steps are included: obtain the discharge superheat of the compressor；When the discharge superheat of the compressor is pre- less than first
If when value, if the outlet superheat degree of the second heat exchange flow path of first heat-exchanging component is less than first outlet target superheat degree,
Aperture then is carried out to the second throttle and turns control down；When the aperture regulation of the second throttle is to minimum aperture, such as
The outlet superheat degree of second heat exchange flow path of the first heat-exchanging component described in fruit is less than the first outlet target superheat degree, then to institute
It states minimum aperture to carry out turning amendment down, according to the second of first heat-exchanging component the heat exchange outlet superheat degree of flow path and described
First outlet target superheat degree continues to turn control down to second throttle progress aperture, until the exhaust of the compressor
Temperature is greater than the second preset value, wherein second preset value is greater than first preset value.
The valve body control method that cold loop is crossed in multi-line system according to an embodiment of the present invention, obtains compressor first
Discharge superheat, when the discharge superheat of compressor is less than the first preset value, if the second heat exchange stream of the first heat-exchanging component
The outlet superheat degree on road is less than first outlet target superheat degree, then carries out aperture to second throttle and turn control down, when the second section
When flowing the aperture regulation of valve and arriving minimum aperture, if the second of the first heat-exchanging component exchange heat flow path outlet superheat degree less than first
The export goal degree of superheat then carries out minimum aperture to turn amendment down, with going out according to the second of the first heat-exchanging component the heat exchange flow path
Temperature of making a slip of the tongue and first outlet target superheat degree continue to turn control down to second throttle progress aperture, until the exhaust of compressor
The degree of superheat is greater than the second preset value.This method is when compressor has back liquid risk, by the aperture for quickly adjusting second throttle
To suitable aperture, it can not only limit excessive refrigerant and return to compressor, the return-air degree of superheat can also be improved and reduce compressor
Return liquid risk, to reach better refrigeration effect and safer operating status.
According to one embodiment of present invention, when the discharge superheat of the compressor is less than the first preset value, judgement
There is back liquid risk in the compressor.
According to one embodiment of present invention, by the way that the current minimum aperture of the second throttle is subtracted default aperture
Threshold value to the minimum aperture to carry out turning amendment down.
According to one embodiment of present invention, the multi-line system carries out work under main refrigeration mode or pure refrigeration mode
Make.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of multi-line system, comprising: outdoor unit,
The outdoor unit includes compressor；Multiple indoor units；Part flow arrangement, the part flow arrangement include that the first heat-exchanging component and second changes
Hot component, the first heat exchange flow path of the outlet and second heat-exchanging component of the first heat exchange flow path of first heat-exchanging component
First throttle valve, the outlet of the first heat exchange flow path of second heat-exchanging component and second heat-exchanging component are set between entrance
The second heat exchange flow path entrance between second throttle is set, the outlet of the second heat exchange flow path of second heat-exchanging component with
The entrance connection of second heat exchange flow path of first heat-exchanging component, the heat exchange flow path of first heat-exchanging component and described second
The heat exchange flow path composition of heat-exchanging component is described to cross cold loop；Control module, the control module is for obtaining the compressor
Discharge superheat, and the of first heat-exchanging component is judged when the discharge superheat of the compressor is less than the first preset value
Whether the outlet superheat degree of two heat exchange flow paths is less than first outlet target superheat degree, wherein if first heat-exchanging component
The outlet superheat degree of second heat exchange flow path is less than first outlet target superheat degree, and the control module is then to the second throttle
It carries out aperture and turns control down, and when the aperture regulation of the second throttle is to minimum aperture, if the first heat exchange group
Part second heat exchange flow path outlet superheat degree be less than the first outlet target superheat degree, the control module then to it is described most
Small guide vane carries out turning amendment down, according to the outlet superheat degree and described first of the second of first heat-exchanging component the heat exchange flow path
The export goal degree of superheat continues to turn control down to second throttle progress aperture, until the discharge superheat of the compressor
Greater than the second preset value, wherein second preset value is greater than first preset value.
Multi-line system according to an embodiment of the present invention, by the discharge superheat of control module acquisition compressor, and
The outlet superheat degree of the second heat exchange flow path of the first heat-exchanging component is judged when the discharge superheat of compressor is less than the first preset value
Whether first outlet target superheat degree is less than, wherein if the outlet superheat degree of the second heat exchange flow path of the first heat-exchanging component is small
In first outlet target superheat degree, control module then carries out aperture to second throttle and turns control down, and in second throttle
When aperture regulation is to minimum aperture, if the outlet superheat degree of the second heat exchange flow path of the first heat-exchanging component is less than first outlet mesh
The degree of superheat is marked, control module then carries out minimum aperture to turn amendment down, according to the second of the first heat-exchanging component the heat exchange flow path
Outlet superheat degree and first outlet target superheat degree continue to turn control down to second throttle progress aperture, until the row of compressor
The gas degree of superheat is greater than the second preset value.The system is when compressor has back liquid risk, by quickly adjusting opening for second throttle
Degree can not only limit excessive refrigerant and return to compressor, can also improve the return-air degree of superheat and reduce compression to suitable aperture
Machine returns liquid risk, to reach better refrigeration effect and safer operating status.
According to one embodiment of present invention you, when the discharge superheat of the compressor is less than the first preset value, institute
It states control module and judges that the compressor has back liquid risk.
According to one embodiment of present invention, the control module is by by the current minimum aperture of the second throttle
Default aperture threshold value is subtracted to carry out turning amendment down to the minimum aperture.
According to one embodiment of present invention, the multi-line system carries out work under main refrigeration mode or pure refrigeration mode
Make.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein
Fig. 1 is the structural schematic diagram of the multi-line system of an implementation according to the present invention；
Fig. 2 is the process that the valve body control method of cold loop is crossed in multi-line system according to an embodiment of the invention
Figure；And
Fig. 3 crosses the process of the valve body control method of cold loop in the multi-line system of a specific example according to the present invention
Figure.
Appended drawing reference: outdoor unit 10, part flow arrangement 20, multiple indoor units 30, compressor 101, the first heat-exchanging component 201,
Second heat-exchanging component 202, first throttle valve 203 and second throttle 204.
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.
With reference to the accompanying drawings come describe the multi-line system proposed according to embodiments of the present invention and its cross cold loop valve body
Control method.
Fig. 1 is the structural schematic diagram of the multi-line system of an implementation according to the present invention.As shown in Figure 1, the system includes:
Outdoor unit 10, part flow arrangement 20, multiple indoor units 30 and control module (not specifically illustrated in figure).
Wherein, outdoor unit 10 includes compressor 101.Part flow arrangement 20 includes the first heat-exchanging component 201 and the second heat exchange group
Part 202, the outlet of the first heat exchange flow path and the entering for the first heat exchange flow path of the second heat-exchanging component 202 of the first heat-exchanging component 201
First throttle valve 203, the outlet of the first heat exchange flow path of the second heat-exchanging component 202 and the second heat-exchanging component 202 are set between mouthful
Second heat exchange flow path entrance between be arranged second throttle 204, the second heat-exchanging component 202 second heat exchange flow path outlet
It is connected to the entrance of the second heat exchange flow path of the first heat-exchanging component 201, the heat exchange flow path of the first heat-exchanging component 201 and the second heat exchange
The heat exchange flow path of component 202 constituted cold loop.
As shown in Figure 1, first throttle valve 203 is shown in a fully open operation when multi-line system is run with pure refrigeration mode, from
The high temperature gas-liquid mixture that the gas-liquid separator of part flow arrangement 20 comes out, successively by the first heat-exchanging component 201 and the second heat exchange
Component 202.The refrigerant come out from the first heat exchange flow path of the second heat-exchanging component 202, a part are expanded by second throttle 204
Evaporation absorbs the heat of the first heat exchange flow path of the first heat-exchanging component 201 and the second heat-exchanging component 202, eventually enters into outdoor unit
10 low-voltage tube, another part enter refrigeration indoor unit by the throttle valve for the indoor unit that freezes, outdoor unit 10 are entered after absorbing heat
Low-voltage tube.
When multi-line system is run with main refrigeration mode, the gas-liquid separator of part flow arrangement 20 will be from the height of outdoor unit 10
The high temperature gas-liquid mixture that pressure pipe enters is divided into highly pressurised liquid and high pressure gas, wherein highly pressurised liquid passes through the first heat-exchanging component
201 supercoolings, high pressure gas enters heating indoor unit, after heating indoor unit heat release, with the liquid flowed out from the first heat-exchanging component 201
Enter the second heat-exchanging component 202 after the mixing of body refrigerant.The refrigerant come out from the first heat exchange flow path of the second heat-exchanging component 202, one
Part after the first heat-exchanging component 201 and the second heat-exchanging component 202 with from refrigeration indoor unit come out refrigerant mix after, entrance
The low-voltage tube of outdoor unit 10, another part enter refrigeration indoor unit by the throttle valve for the indoor unit that freezes, the sky to freeze to needs
Between freeze.
In embodiments of the present invention, when multi-line system is worked under main refrigeration mode or pure refrigeration mode, control
Module is used to obtain the discharge superheat DSH of compressor 101, and in the discharge superheat DSH of compressor less than the first preset value A
When, judge whether the outlet superheat degree SHm3 of the second heat exchange flow path of the first heat-exchanging component 201 is less than first outlet target superheat
Spend B, wherein if the outlet superheat degree SHm3 of the second heat exchange flow path of the first heat-exchanging component 201 is less than first outlet target mistake
Temperature B, control module then carries out aperture to second throttle 204 and turns control down, and arrives in the aperture regulation of second throttle 204
When minimum aperture, if the outlet superheat degree SHm3 of the second heat exchange flow path of the first heat-exchanging component 201 is less than first outlet target
Degree of superheat B, control module then carry out minimum aperture to turn amendment down, according to the second of the first heat-exchanging component 201 the heat exchange flow path
Outlet superheat degree SHm3 and first outlet target superheat degree B continue to second throttle 204 carry out aperture turn control down, up to
The discharge superheat DSH of compressor is greater than the second preset value C, wherein the second preset value C is greater than the first preset value A, and first is default
Value A, first outlet target superheat degree B and the second preset value C can be demarcated according to the actual situation.In embodiments of the present invention, when
When the discharge superheat DSH of compressor 101 is less than the first preset value A, control module judges that compressor 101 has back liquid risk.
Specifically, when multi-line system is worked under main refrigeration mode or pure refrigeration mode, control module obtains compressor 101
Discharge superheat DSH, and DSH < A is judged whether there is, if there is DSH < A, then illustrate that compressor has back liquid risk.In order to meet
The refrigeration demand of refrigeration indoor unit, the throttle valve adjustment for the indoor unit that freezes is as far as possible according to adjusting rule when operating normally, at this time
By adjusting the aperture of second throttle 204 compressor 101 can be made to restore biggish discharge superheat DSH again, to protect
The safe and stable operation of card system.
When the aperture to second throttle 204 is adjusted, control module will be according to the second of the first heat-exchanging component 201
The outlet superheat degree SHm3 and first outlet target superheat degree B of heat exchange flow path carry out PI to second throttle 204
(Proportional Integral, proportional integration) is adjusted, in adjustment process, if control module judges SHm3 < B, and control
Molding block then turns the aperture of second throttle 204 down, to reduce low pressure, improves the return-air degree of superheat of outdoor unit 10.Such as
The aperture of fruit second throttle 204 is transferred to minimum aperture, still remains SHm3 < B, although then illustrating second throttle 204
Aperture has been transferred to minimum aperture, but for cold loop excessively, the aperture of second throttle 204 or larger, mistake cold loop
Can by low temperature refrigerant flow or too many, but second throttle 204 cannot be completely closed again.Because for main system
Multi-line system under cold mode, the refrigerant for heating indoor unit need just return to outdoor unit 10 by second throttle 204, and
Refrigeration indoor unit needs part flow arrangement 20 to have certain degree of superheat, that is, needs the second heat exchange flow path of the first heat-exchanging component 201
There is certain degree of superheat in exit, just has the sky that the refrigerant of enough degree of supercooling SCm2 enters refrigeration indoor unit to freeze to needs
Between freeze, it is therefore desirable to little by little adjust second throttle 204 aperture.
Specifically, control module first carries out turning amendment down to the minimum aperture of second throttle 204, to obtain than minimum
The smaller aperture of aperture, can be improved SHm3, often turn primary minimum aperture down, and SHm3 can be improved a bit.
According to one embodiment of present invention, control module is by subtracting the current minimum aperture of second throttle 204
Aperture threshold value a is preset to carry out turning amendment down to minimum aperture, wherein a is smaller value, such as a can be 1.That is,
When control module carries out turning amendment down to the minimum aperture of second throttle 204, revised minimum aperture=current minimum aperture-
Default aperture threshold value a.
Then, control module according to SHm3 and B continue to second throttle 204 carry out aperture turn control down, when SHm3 again
It is secondary when reaching B, judge whether the discharge superheat DSH of compressor 101 is greater than the second preset value C.If the exhaust of compressor 101
Degree of superheat DSH is greater than the second preset value C, it is ensured that compressor 101 is without liquid risk is returned, and system can be transported at this time with safety and stability
Row, in this way under the premise of system can be with safe and stable operation, control module stablizes the aperture of second throttle 204 current
PI adjusting is carried out to second throttle 204 compared with small guide vane, or according to operating condition variation；If the discharge superheat of compressor 101
DSH is less than or equal to the second preset value C, illustrates that the discharge superheat DSH of compressor 101 is still unsatisfactory for the peace of compressor assembly
Full service condition, control module continues to carry out turning amendment down to the minimum aperture of second throttle 204, until meeting DSH > C.
The multi-line system limits excessive refrigerant and returns to compressor as a result, while reducing compression by improving the return-air degree of superheat
Machine returns liquid risk, to improve the refrigeration effect of system and the safety of operation.
It should be noted that the outlet superheat degree SHm3=Tm3-Tps3 of the second heat exchange flow path of the first heat-exchanging component 201,
Wherein, Tm3 is the outlet temperature of the second heat exchange flow path of the first heat-exchanging component 201, and Tps3 is the of the first heat-exchanging component 201
The corresponding saturation temperature of outlet pressure of two heat exchange flow paths；Degree of supercooling SCm2=Tps2-Tm2 before 204 valve of second throttle,
In, Tps2 is the outlet temperature of the first heat exchange flow path of the second heat-exchanging component 202, and Tm2 is the first of the second heat-exchanging component 202 to change
The corresponding saturation temperature of the outlet pressure of hot flowpath.
In conclusion multi-line system according to an embodiment of the present invention, the exhaust of compressor is obtained by control module
Temperature, and judge that when the discharge superheat of compressor is less than the first preset value, the second heat exchange flow path of the first heat-exchanging component goes out
Whether temperature of making a slip of the tongue is less than first outlet target superheat degree, wherein if the outlet of the second heat exchange flow path of the first heat-exchanging component
The degree of superheat is less than first outlet target superheat degree, and control module then carries out aperture to second throttle and turns control down, and second
When the aperture regulation of throttle valve is to minimum aperture, if the outlet superheat degree of the second heat exchange flow path of the first heat-exchanging component is less than the
The one export goal degree of superheat, control module then carry out minimum aperture to turn amendment down, to change according to the second of the first heat-exchanging component
The outlet superheat degree and first outlet target superheat degree of hot flowpath continue to turn control down to second throttle progress aperture, until pressure
The discharge superheat of contracting machine is greater than the second preset value.The system is when compressor has back liquid risk, by quickly adjusting the second section
The aperture of valve is flowed to suitable aperture, can not only be limited excessive refrigerant and be returned to compressor, can also improve the return-air degree of superheat
That reduces compressor returns liquid risk, to reach better refrigeration effect and safer operating status.
Fig. 2 is the process that the valve body control method of cold loop is crossed in multi-line system according to an embodiment of the invention
Figure.
As shown in Figure 1, multi-line system includes outdoor unit, part flow arrangement and multiple indoor units, outdoor unit includes compressor,
Part flow arrangement includes the first heat-exchanging component and the second heat-exchanging component, the outlet and second of the first heat exchange flow path of the first heat-exchanging component
First throttle valve is set between the entrance of the first heat exchange flow path of heat-exchanging component, and the first heat exchange flow path of the second heat-exchanging component goes out
Second throttle, the second heat exchange of the second heat-exchanging component are set between the entrance of second heat exchange flow path of mouth and the second heat-exchanging component
The outlet of flow path is connected to the entrance of the second heat exchange flow path of the first heat-exchanging component, the heat exchange flow path of the first heat-exchanging component and second
The heat exchange flow path of heat-exchanging component constituted cold loop.
As shown in Fig. 2, in multi-line system cross cold loop valve body control method the following steps are included:
S1 obtains the exhaust of compressor when multi-line system is worked under main refrigeration mode or pure refrigeration mode
Degree of superheat DSH.
S2, when the discharge superheat DSH of compressor is less than the first preset value A, if the second of the first heat-exchanging component changes
The outlet superheat degree SHm3 of hot flowpath is less than first outlet target superheat degree B, then carries out aperture to second throttle and turn control down.
According to one embodiment of present invention, when the discharge superheat DSH of compressor is less than the first preset value A, judgement
There is back liquid risk in compressor.
S3, when the aperture regulation of second throttle is to minimum aperture, if the second heat exchange flow path of the first heat-exchanging component
Outlet superheat degree SHm3 be less than first outlet target superheat degree B, then minimum aperture is carried out turning amendment down, to change according to first
The outlet superheat degree SHm3 and first outlet target superheat degree B of second heat exchange flow path of hot component continue to carry out second throttle
Aperture turns control down, until the discharge superheat DSH of compressor is greater than the second preset value C, wherein the second preset value C is greater than the
One preset value A, the first preset value A, first outlet target superheat degree B and the second preset value C can be demarcated according to the actual situation.
Specifically, when multi-line system is worked under main refrigeration mode or pure refrigeration mode, the row of compressor is obtained
Gas degree of superheat DSH, and DSH < A is judged whether there is, if there is DSH < A, then illustrate that compressor has back liquid risk.In order to meet system
The refrigeration demand of cold indoor unit, the throttle valve adjustment for the indoor unit that freezes according to adjusting rule when operating normally, at this time may be used as far as possible
The compressor 101 is set to restore biggish discharge superheat DSH again with the aperture by adjusting second throttle, to guarantee system
Safe and stable operation.
When the aperture to second throttle is adjusted, go out to make a slip of the tongue according to the second of the first heat-exchanging component the heat exchange flow path
Temperature SHm3 and first outlet target superheat degree B carries out PI (Proportional Integral, ratio product to second throttle
Point) adjust, in adjustment process, if it is determined that SHm3 < B, then turn the aperture of second throttle down, to reduce low pressure,
Improve the return-air degree of superheat of outdoor unit.If the aperture of second throttle is transferred to minimum aperture, SHm3 < B is still remained, is said
Although bright be transferred to minimum aperture for the aperture of second throttle, for crossing for cold loop, the aperture of second throttle
Or it is larger, cross cold loop can by cold medium flux or too many, but second throttle 204 cannot be closed completely again
It closes.Because the refrigerant for heating indoor unit needs to return to room by second throttle for the multi-line system under main refrigeration mode
Outer machine, and the indoor unit that freezes needs part flow arrangement to have certain outlet superheat degree, that is, the second of the first heat-exchanging component is needed to exchange heat
There is certain degree of superheat in the exit of flow path, and the refrigerant for just having enough degree of supercooling SCm2 enters refrigeration indoor unit to needs
Freeze in the space of refrigeration, it is therefore desirable to little by little adjust the aperture of second throttle 204.
In particular, it is desirable to first carry out turning amendment down to the minimum aperture of second throttle, to obtain than minimum aperture more
Small aperture, can be improved SHm3, often turn primary minimum aperture down, and SHm3 can be improved a bit.
According to one embodiment of present invention, by the way that the current minimum aperture of second throttle is subtracted default aperture threshold value
A is to carry out minimum aperture to turn amendment down.Wherein, a is smaller value, such as a can be 1.That is, to second throttle
When minimum aperture carries out turning amendment down, revised minimum aperture=current minimum aperture-presets aperture threshold value a.
Then, continued to turn control down to second throttle progress aperture according to SHm3 and B, when SHm3 reaches B again, be sentenced
Whether the discharge superheat DSH of disconnected compressor is greater than the second preset value C.If the discharge superheat DSH of compressor is greater than second
Preset value C, it is ensured that compressor without return liquid risk, at this time system can with safe and stable operation, in this way system can be safe
Under the premise of stable operation, the aperture of second throttle is stablized currently compared with small guide vane, or is changed according to operating condition to second
Throttle valve carries out PI adjusting；If being less than or equal to the second preset value C by the discharge superheat DSH of compressor, illustrate compressor
Discharge superheat DSH be still unsatisfactory for the safe operating conditions of compressor assembly, continue the minimum aperture to second throttle
It carries out turning amendment down, until meeting DSH > C.This method limit excessive refrigerants to return to compressor as a result, while by mentioning
The high return-air degree of superheat reduces time liquid risk of compressor, to improve the refrigeration effect of system and the safety of operation.
It should be noted that the outlet superheat degree SHm3=Tm3-Tps3 of the second heat exchange flow path of the first heat-exchanging component 201,
Wherein, Tm3 is the outlet temperature of the second heat exchange flow path of the first heat-exchanging component 201, and Tps3 is the of the first heat-exchanging component 201
The corresponding saturation temperature of outlet pressure of two heat exchange flow paths；Degree of supercooling SCm2=Tps2-Tm2 before 204 valve of second throttle,
In, Tps2 is the outlet temperature of the first heat exchange flow path of the second heat-exchanging component 202, and Tm2 is the first of the second heat-exchanging component 202 to change
The corresponding saturation temperature of the outlet pressure of hot flowpath.
Further, to make those skilled in the art better understand the present invention, Fig. 3 be according to the present invention one specifically show
The flow chart of the valve body control method of cold loop is crossed in the multi-line system of example.As shown in figure 3, method includes the following steps:
S101 obtains the exhaust of compressor when multi-line system is worked under main refrigeration mode or pure refrigeration mode
Degree of superheat DSH, and judge whether DSH < A.
S102, if it is determined that DSH < A, illustrates that compressor has back liquid risk, initialize the aperture of second throttle.
S103 carries out PI adjusting to second throttle according to SHm3 and B, if SHm3 < B, carries out to second throttle
Aperture turns control down.
S104, when the aperture regulation of second throttle is to minimum aperture, if still SHm3 < B, to minimum aperture
It carries out turning amendment down, revised minimum aperture=current minimum aperture-presets aperture threshold value a.
S105 continues to turn control down to second throttle progress aperture according to SHm3 and B.
S106 judges whether DSH > C when SHm3 reaches B again, if so, illustrating that compressor without liquid risk is returned, is held
Row step S107, if not；Illustrate that compressor still has back liquid risk, executes step S104.
S107 stablizes the aperture of second throttle currently compared with small guide vane, or throttled according to operating condition variation to second
Valve carries out PI adjusting.
In conclusion crossing the valve body control method of cold loop in multi-line system according to an embodiment of the present invention, obtain first
The discharge superheat for taking compressor, when the discharge superheat of compressor is less than the first preset value, if the first heat-exchanging component
The outlet superheat degree of second heat exchange flow path is less than first outlet target superheat degree, then carries out aperture to second throttle and turn control down
System, when the aperture regulation of second throttle arrives minimum aperture, if the second heat exchange flow path of the first heat-exchanging component is made a slip of the tongue out
Temperature is less than first outlet target superheat degree, then carries out turning amendment down to minimum aperture, according to the second of the first heat-exchanging component
The outlet superheat degree and first outlet target superheat degree of heat exchange flow path continue to turn control down to second throttle progress aperture, until
The discharge superheat of compressor is greater than the second preset value.This method is when compressor has back liquid risk as a result, by adjusting second
The aperture of throttle valve can not only limit excessive refrigerant and return to compressor, and can also reduce compressor returns liquid risk, thus
The refrigeration effect of raising system and the safety of operation.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is 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
There must be 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 (8)
1. crossing the valve body control method of cold loop in a kind of multi-line system, which is characterized in that the multi-line system includes room
Outer machine, part flow arrangement and multiple indoor units, the outdoor unit include compressor, the part flow arrangement include the first heat-exchanging component and
Second heat-exchanging component, the outlet and the first heat exchange of second heat-exchanging component of the first heat exchange flow path of first heat-exchanging component
First throttle valve is set between the entrance of flow path, and the outlet of the first heat exchange flow path of second heat-exchanging component is changed with described second
Second throttle is set between the entrance of the second heat exchange flow path of hot component, the second heat exchange flow path of second heat-exchanging component
It exports and is connected to the entrance of the second heat exchange flow path of first heat-exchanging component, the heat exchange flow path of first heat-exchanging component and institute
The heat exchange flow path for stating the second heat-exchanging component constituted cold loop, the described method comprises the following steps:
Obtain the discharge superheat of the compressor；
When the discharge superheat of the compressor is less than the first preset value, if the second heat exchange stream of first heat-exchanging component
The outlet superheat degree on road is less than first outlet target superheat degree, then carries out aperture to the second throttle and turn control down；
When the aperture regulation of the second throttle is to minimum aperture, if the second heat exchange flow path of first heat-exchanging component
Outlet superheat degree be less than the first outlet target superheat degree, then the minimum aperture is carried out turning amendment down, according to institute
The outlet superheat degree and the first outlet target superheat degree for stating the second heat exchange flow path of the first heat-exchanging component continue to described the
Two throttle valves carry out aperture and turn control down, until the discharge superheat of the compressor is greater than the second preset value, wherein described the
Two preset values are greater than first preset value.
2. crossing the valve body control method of cold loop in multi-line system according to claim 1, which is characterized in that when described
When the discharge superheat of compressor is less than the first preset value, judge that the compressor has back liquid risk.
3. crossing the valve body control method of cold loop in multi-line system according to claim 1 or 2, which is characterized in that logical
It crosses and the current minimum aperture of the second throttle is subtracted into default aperture threshold value to carry out turning amendment down to the minimum aperture.
4. crossing the valve body control method of cold loop in multi-line system according to claim 1, which is characterized in that described more
On-line system works under main refrigeration mode or pure refrigeration mode.
5. a kind of multi-line system characterized by comprising
Outdoor unit, the outdoor unit include compressor；
Multiple indoor units；
Part flow arrangement, the part flow arrangement include the first heat-exchanging component and the second heat-exchanging component, and the of first heat-exchanging component
First throttle valve is set between the entrance of first heat exchange flow path of the outlet and second heat-exchanging component of one heat exchange flow path, it is described
It is set between the entrance of second heat exchange flow path of the outlet and second heat-exchanging component of the first heat exchange flow path of the second heat-exchanging component
Set second throttle, the outlet and the second heat exchange of first heat-exchanging component of the second heat exchange flow path of second heat-exchanging component
The entrance of flow path is connected to, and the heat exchange flow path of first heat-exchanging component and the heat exchange flow path of second heat-exchanging component constitute supercooling
Circuit；
Control module, the control module are used to obtain the discharge superheat of the compressor, and in the exhaust of the compressor
Judge whether the outlet superheat degree of the second heat exchange flow path of first heat-exchanging component is less than when the degree of superheat is less than the first preset value
First outlet target superheat degree, wherein if the outlet superheat degree of the second heat exchange flow path of first heat-exchanging component is less than the
The one export goal degree of superheat, the control module then carry out aperture to the second throttle and turn control down, and described second
When the aperture regulation of throttle valve is to minimum aperture, if the outlet superheat degree of the second heat exchange flow path of first heat-exchanging component is small
In the first outlet target superheat degree, the control module then carries out turning amendment down to the minimum aperture, according to
The outlet superheat degree of second heat exchange flow path of the first heat-exchanging component and the first outlet target superheat degree continue to described second
Throttle valve carries out aperture and turns control down, until the discharge superheat of the compressor is greater than the second preset value, wherein described second
Preset value is greater than first preset value.
6. multi-line system according to claim 5, which is characterized in that when the discharge superheat of the compressor is less than
When one preset value, the control module judges that the compressor has back liquid risk.
7. multi-line system according to claim 5 or 6, which is characterized in that the control module passes through described second
The current minimum aperture of throttle valve subtracts default aperture threshold value to carry out turning amendment down to the minimum aperture.
8. multi-line system according to claim 5, which is characterized in that the multi-line system is in main refrigeration mode or pure
It works under refrigeration mode.
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| CN106152633B (en) * | 2016-06-28 | 2018-07-10 | 广东美的暖通设备有限公司 | Multi-line system and its control method |
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| CN111271837B (en) * | 2019-12-30 | 2021-07-06 | 宁波奥克斯电气股份有限公司 | Air conditioner internal unit control method and system, air conditioner and readable storage medium |
| CN112413937B (en) * | 2020-11-23 | 2022-05-31 | 珠海格力电器股份有限公司 | Water chilling unit and electronic expansion valve control method, device and system thereof |
| CN112984856A (en) * | 2021-03-31 | 2021-06-18 | 广东积微科技有限公司 | Electronic valve control system suitable for modular water machine and control method thereof |
| CN113915806B (en) * | 2021-10-20 | 2023-03-31 | 广东美的制冷设备有限公司 | Refrigerant sound reduction control system, method, air conditioner and computer readable medium |
| CN114992826A (en) * | 2022-07-13 | 2022-09-02 | 广东美的制冷设备有限公司 | Control method and device of multi-split system, multi-split system and storage medium |
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