CN105972860A - Multi-split system and valve control method of supercooling return circuit of multi-split system - Google Patents
Multi-split system and valve control method of supercooling return circuit of multi-split system Download PDFInfo
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- CN105972860A CN105972860A CN201610285059.9A CN201610285059A CN105972860A CN 105972860 A CN105972860 A CN 105972860A CN 201610285059 A CN201610285059 A CN 201610285059A CN 105972860 A CN105972860 A CN 105972860A
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- Prior art keywords
- heat
- exchanging component
- heat exchange
- superheat
- compressor
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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
-
- 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
Abstract
The invention discloses a multi-split system and a valve control method of a supercooling return circuit of the multi-split system. The valve control method comprises the following steps that an exhaust superheating degree of a compressor is acquired; when the exhaust superheating degree is less than a first preset value, if an outlet superheating degree of a second heat exchange flow path of a first heat exchange component is less than a first outlet target superheating degree, opening turning-down control is conducted on a second throttling valve; and when the opening of the second throttling valve is adjusted to the smallest, if the outlet superheating degree of the second heat exchange flow path of the first heat exchange component is less than the first outlet target superheating degree, the smallest opening is subjected to turning-down modification, and the opening turning-down control is conducted on the second throttling valve continuously till the exhaust superheating degree of the compressor is greater than a second preset value. According to the valve control method, when the compressor has a liquid return risk, through the adjustment on the opening of the second throttling valve, a situation that excessive refrigerant returns to the compressor is limited, the air return superheating degree can be increased and the liquid return risk of the compressor is reduced, thereby improving the refrigerating effect and the running safety of the multi-split system.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly relate in a kind of multiple on-line system cross cold loop valve body control method and
A kind of multiple on-line system.
Background technology
The main refrigeration mode of multiple on-line system can utilize condensation heat and the heat of evaporation of system simultaneously, it is achieved freezes simultaneously and heats,
Substantially increase system energy efficiency.In multiple on-line system, liquid state coolant can be assigned to tool by part flow arrangement by off-premises station
Having different refrigeration, the indoor set of heating needs, wherein, part flow arrangement was provided with cold loop.
When multiple on-line system is run with main refrigeration mode or pure refrigeration mode, when the outlet superheat degree of refrigeration indoor set is the least,
Or the coolant of supercool circuit outlet is more and the less gas to the exit of refrigeration indoor set of outlet superheat degree produces stronger
During cooling effect, return-air can be caused to be easily carried liquid and return to the air entry of compressor, now the discharge superheat of system is relatively low,
Thus affect the safe operation of system.
Summary of the invention
It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.To this end, the one of the present invention
Purpose is to propose in a kind of multiple on-line system to cross the valve body control method of cold loop, the method when compressor has back liquid risk,
By the aperture of adjustment second throttle to suitable aperture, it is possible not only to limit too much coolant and returns to compressor, it is also possible to
Improve the return-air degree of superheat and reduce time liquid risk of compressor, thus improve the refrigeration of system and the safety of operation.
Further object is that a kind of multiple on-line system of proposition.
For reaching above-mentioned purpose, one aspect of the present invention embodiment proposes the valve body control crossing cold loop in a kind of multiple on-line system
Method, described multiple on-line system includes off-premises station, part flow arrangement and multiple indoor set, and described off-premises station includes compressor, institute
State part flow arrangement and include the first heat-exchanging component and the second heat-exchanging component, the outlet of the first heat exchange stream of described first heat-exchanging component
And first throttle valve is set between the entrance of the first heat exchange stream of described second heat-exchanging component, the of described second heat-exchanging component
Between the entrance of the outlet of one heat exchange stream and the second heat exchange stream of described second heat-exchanging component, second throttle is set, described
The outlet of the second heat exchange stream of the second heat-exchanging component connects with the entrance of the second heat exchange stream of described first heat-exchanging component, institute
The heat exchange stream of the heat exchange stream and described second heat-exchanging component of stating the first heat-exchanging component constitutes described cold loop, described method excessively
Comprise the following steps: obtain the discharge superheat of described compressor；When the discharge superheat of described compressor is preset less than first
During value, if the outlet superheat degree of the second heat exchange stream of described first heat-exchanging component is less than the first export goal degree of superheat, then
Described second throttle is carried out aperture and turns control down；When the aperture of described second throttle is adjusted to minimum aperture, if
The outlet superheat degree of the second heat exchange stream of described first heat-exchanging component is less than the described first export goal degree of superheat, then to described
Minimum aperture carries out turning correction down, with the outlet superheat degree of the second heat exchange stream according to described first heat-exchanging component and described the
The one export goal degree of superheat continues that described second throttle is carried out aperture and turns control down, until the discharge superheat of described compressor
Degree is more than the second preset value, and wherein, described second preset value is more than described first preset value.
Multiple on-line system according to embodiments of the present invention is crossed the valve body control method of cold loop, first obtains the aerofluxus of compressor
The degree of 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
Outlet superheat degree is less than the first export goal degree of superheat, then second throttle is carried out aperture and turn control down, work as second throttle
Aperture when being adjusted to minimum aperture, if the outlet superheat degree of the second heat exchange stream of the first heat-exchanging component is less than the first outlet
Target superheat degree, then turn correction down to minimum aperture, goes out to make a slip of the tongue with the second heat exchange stream according to the first heat-exchanging component
Temperature and the first export goal degree of superheat continue that second throttle is carried out aperture and turn control down, until the discharge superheat of compressor
Degree is more than the second preset value.The method is when compressor has back liquid risk, by quickly adjusting the aperture of second throttle to closing
Suitable aperture, is possible not only to limit too much coolant and returns to compressor, it is also possible to improves the return-air degree of superheat and reduces returning of compressor
Liquid risk, thus reach more preferable refrigeration and safer running status.
According to one embodiment of present invention, when the discharge superheat of described compressor is less than the first preset value, it is judged that described
There is back liquid risk in compressor.
According to one embodiment of present invention, by the current minimum aperture of described second throttle is deducted default aperture threshold value
So that described minimum aperture is turned down correction.
According to one embodiment of present invention, described multiple on-line system is operated under main refrigeration mode or pure refrigeration mode.
For reaching above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of multiple on-line system, including: off-premises station, institute
State off-premises station and include compressor；Multiple indoor sets；Part flow arrangement, described part flow arrangement includes that the first heat-exchanging component and second changes
Hot assembly, the outlet of the first heat exchange stream of described first heat-exchanging component and the first heat exchange stream of described second heat-exchanging component
First throttle valve is set between entrance, the outlet of the first heat exchange stream of described second heat-exchanging component and described second heat-exchanging component
The second heat exchange stream entrance between second throttle is set, the outlet of the second heat exchange stream of described second heat-exchanging component with
The entrance connection of the second heat exchange stream of described first heat-exchanging component, the heat exchange stream of described first heat-exchanging component and described second
The heat exchange stream composition of heat-exchanging component is described crosses cold loop；Control module, described control module is for obtaining described compressor
Discharge superheat, and the of described first heat-exchanging component is judged when the discharge superheat of described compressor is less than the first preset value
Whether the outlet superheat degree of two heat exchange streams is less than the first export goal degree of superheat, wherein, if described first heat-exchanging component
The outlet superheat degree of the second heat exchange stream is less than the first export goal degree of superheat, and described control module is then to described second throttle
Carry out aperture and turn control down, and when the aperture of described second throttle is adjusted to minimum aperture, if described first heat exchange group
The outlet superheat degree of the second heat exchange stream of part is less than the described first export goal degree of superheat, described control module then to described
Small guide vane carries out turning correction down, with the outlet superheat degree and described first of the second heat exchange stream according to described first heat-exchanging component
The export goal degree of superheat continues that described second throttle is carried out aperture and turns control down, until the discharge superheat of described compressor
More than the second preset value, wherein, described second preset value is more than described first preset value.
Multiple on-line system according to embodiments of the present invention, obtains the discharge superheat of compressor by control module, and in compression
Judge when the discharge superheat of machine is less than the first preset value that the outlet superheat degree of the second heat exchange stream of the first heat-exchanging component is the least
In the first export goal degree of superheat, wherein, if the outlet superheat degree of the second heat exchange stream of the first heat-exchanging component is less than first
The export goal degree of superheat, control module then carries out aperture and turns control down second throttle, and at the aperture tune of second throttle
When joint is to minimum aperture, if the outlet superheat degree of the second heat exchange stream of the first heat-exchanging component is overheated less than the first export goal
Degree, minimum aperture then turned down correction by control module, goes out to make a slip of the tongue with the second heat exchange stream according to the first heat-exchanging component
Temperature and the first export goal degree of superheat continue that second throttle is carried out aperture and turn control down, until the discharge superheat of compressor
Degree is more than the second preset value.This system is when compressor has back liquid risk, by quickly adjusting the aperture of second throttle to closing
Suitable aperture, is possible not only to limit too much coolant and returns to compressor, it is also possible to improves the return-air degree of superheat and reduces returning of compressor
Liquid risk, thus reach more preferable refrigeration and safer running status.
According to one embodiment of present invention you, when described compressor discharge superheat less than the first preset value time, described control
Molding block judges that described compressor exists back liquid risk.
According to one embodiment of present invention, described control module is by deducting the current minimum aperture of described second throttle
Preset aperture threshold value so that described minimum aperture is turned down correction.
According to one embodiment of present invention, described multiple on-line system is operated under main refrigeration mode or pure refrigeration mode.
Accompanying drawing explanation
Aspect that the present invention is above-mentioned and/or additional and advantage will be apparent from from the following description of the accompanying drawings of embodiments and
Easy to understand, wherein,
Fig. 1 is the structural representation of the multiple on-line system implemented according to the present invention one；
Fig. 2 is the flow chart of the valve body control method crossing cold loop according to an embodiment of the invention in multiple on-line system；With
And
Fig. 3 is according to the flow chart of the valve body control method crossing cold loop in the multiple on-line system of one concrete example of the present invention.
Reference: off-premises station 10, part flow arrangement 20, multiple indoor set 30, compressor the 101, first heat-exchanging component 201,
Second heat-exchanging component 202, first throttle valve 203 and second throttle 204.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical
Or similar label represents same or similar element or has the element of same or like function.Retouch below with reference to accompanying drawing
The embodiment stated is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Describe the multiple on-line system proposed according to embodiments of the present invention with reference to the accompanying drawings and cross the valve body control of cold loop
Method.
Fig. 1 is the structural representation of the multiple on-line system implemented according to the present invention one.As it is shown in figure 1, this system includes:
Off-premises station 10, part flow arrangement 20, multiple indoor set 30 and control module (not specifically illustrated in figure).
Wherein, off-premises station 10 includes compressor 101.Part flow arrangement 20 includes the first heat-exchanging component 201 and the second heat-exchanging component
202, the outlet of the first heat exchange stream of the first heat-exchanging component 201 and the entrance of the first heat exchange stream of the second heat-exchanging component 202
Between first throttle valve 203 is set, the outlet of the first heat exchange stream of the second heat-exchanging component 202 and the second heat-exchanging component 202
The second heat exchange stream entrance between second throttle 204 is set, going out of the second heat exchange stream of the second heat-exchanging component 202
Mouth connects with the entrance of the second heat exchange stream of the first heat-exchanging component 201, the heat exchange stream and second of the first heat-exchanging component 201
The heat exchange stream of heat-exchanging component 202 constituted cold loop.
As it is shown in figure 1, when multiple on-line system is run with pure refrigeration mode, first throttle valve 203 is shown in a fully open operation,
From the gas-liquid separator of part flow arrangement 20 High Temperature Gas liquid mixture out, successively through the first heat-exchanging component 201 and
Two heat-exchanging components 202.From the first heat exchange stream of the second heat-exchanging component 202 coolant out, a part is by the second throttling
Valve 204 expands evaporation, absorbs the heat of the first heat exchange stream of the first heat-exchanging component 201 and the second heat-exchanging component 202,
Eventually entering into the low-voltage tube of off-premises station 10, another part enters refrigeration indoor set, warp by the choke valve of refrigeration indoor set
Absorb heat laggard enter off-premises station 10 low-voltage tube.
When multiple on-line system is run with main refrigeration mode, the gas-liquid separator of part flow arrangement 20 is by from off-premises station 10
The High Temperature Gas liquid mixture that high-voltage tube enters is divided into highly pressurised liquid and gases at high pressure, and wherein, highly pressurised liquid is through the first heat exchange
Assembly 201 is supercool, and gases at high pressure enter and heat indoor set, after heating indoor set heat release, and from the first heat-exchanging component 201
The second heat-exchanging component 202 is entered after the liquid coolant mixing flowed out.From the first heat exchange stream of the second heat-exchanging component 202 out
Coolant, a part after the first heat-exchanging component 201 and the second heat-exchanging component 202 with from refrigeration indoor set coolant out
After mixing, entering the low-voltage tube of off-premises station 10, another part enters refrigeration indoor set by the choke valve of refrigeration indoor set,
Is freezed in the space needing refrigeration.
In embodiments of the present invention, when multiple on-line system is operated under main refrigeration mode or pure refrigeration mode, control module
For obtaining the discharge superheat DSH of compressor 101, and it is less than the first preset value A at the discharge superheat DSH of compressor
Time, it is judged that whether the outlet superheat degree SHm3 of the second heat exchange stream of the first heat-exchanging component 201 is less than the first export goal mistake
Temperature B, wherein, if the outlet superheat degree SHm3 of the second heat exchange stream of the first heat-exchanging component 201 is less than the first outlet
Target superheat degree B, control module then carries out aperture to second throttle 204 and turns control down, and in second throttle 204
When aperture is adjusted to minimum aperture, if the outlet superheat degree SHm3 of the second heat exchange stream of the first heat-exchanging component 201 is less than
First export goal degree of superheat B, minimum aperture is then turned down correction, with according to the first heat-exchanging component 201 by control module
The outlet superheat degree SHm3 of the second heat exchange stream and first export goal degree of superheat B continue second throttle 204 is carried out
Aperture turns control down, until the discharge superheat DSH of compressor is more than the second preset value C, wherein, the second preset value C is big
Can be according to actual feelings in the first preset value A, the first preset value A, first export goal degree of superheat B and the second preset value C
Condition is demarcated.In embodiments of the present invention, when the discharge superheat DSH of compressor 101 is less than the first preset value A, control
Molding block judges that compressor 101 exists back liquid risk.Specifically, multiple on-line system is under main refrigeration mode or pure refrigeration mode
When being operated, control module obtains the discharge superheat DSH of compressor 101, and determines whether DSH ＜ A, if
Have DSH ＜ A, then explanation compressor has back liquid risk.In order to meet the refrigeration demand of refrigeration indoor set, refrigeration indoor set
Throttle valve adjustment, as far as possible according to regulation rule time properly functioning, now can be come by the aperture adjusting second throttle 204
Make compressor 101 again recover bigger discharge superheat DSH, ensure the safe and stable operation of system.
When being adjusted the aperture of second throttle 204, control module will be changed according to the second of the first heat-exchanging component 201
Outlet superheat degree SHm3 and first export goal degree of superheat B of hot flowpath carry out PI (Proportional to second throttle 204
Integral, proportional integral) regulation, during regulation, if control module judges SHm3 ＜ B, control module is then by the
The aperture of two choke valves 204 is turned down, to reduce low pressure, improves the return-air degree of superheat of off-premises station 10.If the second throttling
The aperture of valve 204 is transferred to minimum aperture, still there is SHm3 ＜ B, although then the aperture of second throttle 204 is adjusted by explanation
Arrive minimum aperture, but for crossing cold loop, the aperture of second throttle 204 is the biggest, and crossing cold loop can
The low temperature cold medium flux passed through is the most too many, but can not second throttle 204 be completely closed again.Because for main refrigeration
Multiple on-line system under pattern, the coolant heating indoor set needs just can be returned to off-premises station 10 by second throttle 204, and
Refrigeration indoor set needs part flow arrangement 20 to have certain degree of superheat, i.e. needs the second heat exchange stream of the first heat-exchanging component 201
There is certain degree of superheat in exit, and the coolant just having enough degree of supercoolings SCm2 enters refrigeration indoor set with to needing refrigeration
Freezing in space, it is therefore desirable to little by little regulates the aperture of second throttle 204.
Specifically, the minimum aperture of second throttle 204 is first turned down correction by control module, to obtain opening than minimum
Spending less aperture, can improve SHm3, often turn once minimum aperture down, SHm3 can improve a bit.
According to one embodiment of present invention, control module is by deducting default by the current minimum aperture of second throttle 204
Aperture threshold value a is to turn correction down to minimum aperture, wherein, a be smaller value, such as a can be 1.It is to say,
When control module aperture minimum to second throttle 204 turns correction down, revised minimum aperture=current minimum aperture
-preset aperture threshold value a.
Then, according to SHm3 and B, control module continues that second throttle 204 is carried out aperture and turns control down, work as SHm3
When again reaching B, it is judged that whether the discharge superheat DSH of compressor 101 is more than the second preset value C.If compressor
The discharge superheat DSH of 101 is more than the second preset value C, it is ensured that compressor 101 is without returning liquid risk, and now system can
With safe and stable operation, so on the premise of system can be with safe and stable operation, control module is by second throttle 204
Aperture is stable at current relatively small guide vane, or according to working conditions change, second throttle 204 is carried out PI regulation；If compressor
The discharge superheat DSH of 101 is less than or equal to the second preset value C, the discharge superheat DSH of compressor 101 is described still
Being unsatisfactory for the safe operating conditions of compressor assembly, control module continues to turn the minimum aperture of second throttle 204 down
Revise, until meeting DSH ＞ C.Thus, this multiple on-line system limits too much coolant and returns to compressor, passes through simultaneously
Improve the return-air degree of superheat and decrease time liquid risk of compressor, thus improve the refrigeration of system and the safety of operation.
It should be noted that the outlet superheat degree SHm3=Tm3-Tps3 of the second heat exchange stream of the first heat-exchanging component 201, its
In, Tm3 is the outlet temperature of the second heat exchange stream of the first heat-exchanging component 201, and Tps3 is the first heat-exchanging component 201
The saturation temperature that the outlet pressure of the second heat exchange stream is corresponding；Degree of supercooling SCm2=Tps2-Tm2 before second throttle 204 valve,
Wherein, Tps2 is the outlet temperature of the first heat exchange stream of the second heat-exchanging component 202, and Tm2 is the second heat-exchanging component 202
The saturation temperature that the outlet pressure of the first heat exchange stream is corresponding.
In sum, multiple on-line system according to embodiments of the present invention, the discharge superheat of compressor is obtained by control module,
And the outlet superheat of the second heat exchange stream of the first heat-exchanging component is judged when the discharge superheat of compressor is less than the first preset value
Whether degree is less than the first export goal degree of superheat, wherein, if the outlet superheat degree of the second heat exchange stream of the first heat-exchanging component
Less than the first export goal degree of superheat, control module then carries out aperture to second throttle and turns control down, and in second throttle
Aperture when being adjusted to minimum aperture, if the outlet superheat degree of the second heat exchange stream of the first heat-exchanging component is less than the first outlet
Target superheat degree, minimum aperture is then turned down correction, with the second heat exchange stream according to the first heat-exchanging component by control module
Outlet superheat degree and the first export goal degree of superheat continue second throttle is carried out aperture to turn control down, until compressor
Discharge superheat is more than the second preset value.This system is when compressor has back liquid risk, by quickly adjusting second throttle
Aperture, to suitable aperture, is possible not only to limit too much coolant and returns to compressor, it is also possible to improves the return-air degree of superheat and reduces pressure
Time liquid risk of contracting machine, thus reach more preferable refrigeration and safer running status.
Fig. 2 is the flow chart of the valve body control method crossing cold loop according to an embodiment of the invention in multiple on-line system.
As it is shown in figure 1, multiple on-line system includes off-premises station, part flow arrangement and multiple indoor set, off-premises station 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 stream of the first heat-exchanging component
Between the entrance of the first heat exchange stream of heat-exchanging component, first throttle valve is set, going out of the first heat exchange stream of the second heat-exchanging component
Between the entrance of the second heat exchange stream of mouth and the second heat-exchanging component, second throttle is set, the second heat exchange of the second heat-exchanging component
The outlet of stream connects with the entrance of the second heat exchange stream of the first heat-exchanging component, the heat exchange stream of the first heat-exchanging component and second
The heat exchange stream of heat-exchanging component constituted cold loop.
As in figure 2 it is shown, the valve body control method crossing cold loop in multiple on-line system comprises the following steps:
S1, when multiple on-line system is operated under main refrigeration mode or pure refrigeration mode, obtains the discharge superheat of compressor
Degree DSH.
S2, when the discharge superheat DSH of compressor is less than the first preset value A, if the second heat exchange of the first heat-exchanging component
The outlet superheat degree SHm3 of stream is less than first export goal degree of superheat B, then second throttle is carried out aperture 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, it is judged that pressure
There is back liquid risk in contracting machine.
S3, when the aperture of second throttle is adjusted to minimum aperture, if the going out of the second heat exchange stream of the first heat-exchanging component
Temperature SHm3 of making a slip of the tongue is less than first export goal degree of superheat B, then minimum aperture is turned correction down, to change according to first
The outlet superheat degree SHm3 of the second heat exchange stream of hot assembly and first export goal degree of superheat B continue to enter second throttle
Row aperture turns control down, until the discharge superheat DSH of compressor is more than the second preset value C, wherein, the second preset value C
Can be according to reality more than the first preset value A, the first preset value A, first export goal degree of superheat B and the second preset value C
Situation is demarcated.
Specifically, when multiple on-line system is operated under main refrigeration mode or pure refrigeration mode, obtain the aerofluxus of compressor
Temperature DSH, and determine whether DSH ＜ A, if there being DSH ＜ A, then explanation compressor has back liquid risk.In order to full
The refrigeration demand of foot refrigeration indoor set, the throttle valve adjustment of refrigeration indoor set is as far as possible regular according to regulation time properly functioning, this
Time compressor 101 can be made again to recover bigger discharge superheat DSH by the aperture adjusting second throttle, protect
The safe and stable operation of card system.
When the aperture of second throttle is adjusted, according to the outlet superheat degree of the second heat exchange stream of the first heat-exchanging component
SHm3 and first export goal degree of superheat B carry out PI (Proportional Integral, proportional integral) and adjust second throttle
Joint, during regulation, if it is determined that SHm3 ＜ B, then turns down the aperture of second throttle, to reduce low pressure,
Improve the return-air degree of superheat of off-premises station.If the aperture of second throttle to be transferred to minimum aperture, still there is SHm3 ＜ B,
Although illustrating to be transferred to the aperture of second throttle minimum aperture, but for crossing cold loop, opening of second throttle
Degree is the biggest, crosses cold medium flux that cold loop can pass through or too many, but again can not be by complete for second throttle 204
Close.Because for the multiple on-line system under main refrigeration mode, the coolant heating indoor set needs to be returned to by second throttle
Off-premises station, and refrigeration indoor set need part flow arrangement to have certain outlet superheat degree, i.e. need the second of the first heat-exchanging component to change
There is certain degree of superheat in the exit of hot flowpath, and the coolant just having enough degree of supercoolings SCm2 enters refrigeration indoor set with right
Freezing in the space needing refrigeration, it is therefore desirable to little by little regulates the aperture of second throttle 204.
In particular, it is desirable to first the minimum aperture of second throttle is turned down correction, less than minimum aperture to obtain
Aperture, can improve SHm3, often turns once minimum aperture down, and SHm3 can improve a bit.
According to one embodiment of present invention, by the current minimum aperture of second throttle is deducted default aperture threshold value a with
Minimum aperture is turned down correction.Wherein, a be smaller value, such as a can be 1.It is to say, to the second throttling
When valve minimum aperture carries out turning correction down, revised minimum aperture=current minimum aperture-preset aperture threshold value a.
Then, continue that second throttle is carried out aperture according to SHm3 and B and turn control down, when SHm3 reaches B again,
Judge that whether the discharge superheat DSH of compressor is more than the second preset value C.If the discharge superheat DSH of compressor is big
In the second preset value C, it is ensured that compressor is without returning liquid risk, and now system can be with safe and stable operation, so in system
On the premise of can be with safe and stable operation, by stable for the aperture of second throttle at current relatively small guide vane, or become according to operating mode
Change and second throttle is carried out PI regulation；If by the discharge superheat DSH of compressor less than or equal to the second preset value C,
Illustrate that the discharge superheat DSH of compressor is still unsatisfactory for the safe operating conditions of compressor assembly, continue second throttle
Minimum aperture carry out turning correction down, until meet DSH ＞ C.Thus, this method limit too much coolant and return to compression
Machine, decreases time liquid risk of compressor simultaneously, thus improves refrigeration and the fortune of system by improving the return-air degree of superheat
The safety of row.
It should be noted that the outlet superheat degree SHm3=Tm3-Tps3 of the second heat exchange stream of the first heat-exchanging component 201, its
In, Tm3 is the outlet temperature of the second heat exchange stream of the first heat-exchanging component 201, and Tps3 is the first heat-exchanging component 201
The saturation temperature that the outlet pressure of the second heat exchange stream is corresponding；Degree of supercooling SCm2=Tps2-Tm2 before second throttle 204 valve,
Wherein, Tps2 is the outlet temperature of the first heat exchange stream of the second heat-exchanging component 202, and Tm2 is the second heat-exchanging component 202
The saturation temperature that the outlet pressure of the first heat exchange stream is corresponding.
Further, for making those skilled in the art better understand the present invention, Fig. 3 is according to one concrete example of the present invention
Multiple on-line system in cross the flow chart of valve body control method of cold loop.As it is shown on figure 3, the method comprises the following steps:
S101, when multiple on-line system is operated under main refrigeration mode or pure refrigeration mode, obtains the discharge superheat of compressor
Degree DSH, and judge whether DSH ＜ A.
S102, if it is determined that DSH ＜ A, illustrates that compressor exists back liquid risk, initializes the aperture of second throttle.
S103, carries out PI regulation according to SHm3 and B to second throttle, if SHm3 is ＜ B, then to second throttle
Carry out aperture and turn control down.
S104, when the aperture of second throttle is adjusted to minimum aperture, if still SHm3 ＜ B, then enters minimum aperture
Row turns correction, revised minimum aperture=current minimum aperture-preset aperture threshold value a down.
According to SHm3 and B, S105, continues that second throttle is carried out aperture and turns control down.
S106, when SHm3 reaches B again, it may be judged whether DSH ＞ C, if it is, explanation compressor is without returning liquid risk,
Perform step S107, if not；Illustrate that compressor still has back liquid risk, perform step S104.
S107, by stable for the aperture of second throttle at current relatively small guide vane, or enters second throttle according to working conditions change
Row PI regulates.
In sum, multiple on-line system according to embodiments of the present invention is crossed the valve body control method of cold loop, first obtains pressure
The discharge superheat of contracting machine, when the discharge superheat of compressor is less than the first preset value, if the second of the first heat-exchanging component
The outlet superheat degree of heat exchange stream is less than the first export goal degree of superheat, then second throttle is carried out aperture and turn control down, when
When the aperture of second throttle is adjusted to minimum aperture, if the outlet superheat degree of the second heat exchange stream of the first heat-exchanging component is little
In the first export goal degree of superheat, then minimum aperture is turned down correction, with the second heat exchange stream according to the first heat-exchanging component
The outlet superheat degree on road and the first export goal degree of superheat continue that second throttle is carried out aperture and turn control down, until compressor
Discharge superheat more than the second preset value.Thus, the method is when compressor has back liquid risk, by adjusting the second throttling
The aperture of valve, is possible not only to limit too much coolant and returns to compressor, it is also possible to that reduces compressor returns liquid risk, thus carries
The refrigeration of high system and the safety of operation.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward ",
Orientation or the position relationship of the instruction such as " clockwise ", " counterclockwise ", " axially ", " radially ", " circumferential " are based on shown in the drawings
Orientation or position relationship, be for only for ease of describe the present invention and simplify describe rather than instruction or hint indication device or
Element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance or
The implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or hidden
At least one this feature is included containing ground.In describing the invention, " multiple " are meant that at least two, such as two, three
Individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", the art such as " fixing "
Language should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be machinery
Connect, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two units
Connection within part or the interaction relationship of two elements, unless otherwise clear and definite restriction.Ordinary skill for this area
For personnel, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be
First and second features directly contact, or the first and second features are by intermediary mediate contact.And, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below "
Can be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second
Feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " concrete example ",
Or specific features, structure, material or the feature bag that the description of " some examples " etc. means to combine this embodiment or example describes
It is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term necessarily
It is directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be arbitrary
Individual or multiple embodiment or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be combined by art personnel
And combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is exemplary,
Being not considered as limiting the invention, those of ordinary skill in the art within the scope of the invention can be to above-described embodiment
It is changed, revises, replaces and modification.
Claims (8)
1. a multiple on-line system is crossed the valve body control method of cold loop, it is characterised in that described multiple on-line system includes room
Outer machine, part flow arrangement and multiple indoor set, described off-premises station includes that compressor, described part flow arrangement include the first heat-exchanging component
With the second heat-exchanging component, the outlet of the first heat exchange stream of described first heat-exchanging component is changed with the first of described second heat-exchanging component
First throttle valve is set between the entrance of hot flowpath, the outlet and described second of the first heat exchange stream of described second heat-exchanging component
Second throttle is set between the entrance of the second heat exchange stream of heat-exchanging component, the second heat exchange stream of described second heat-exchanging component
Outlet connect with the entrance of the second heat exchange stream of described first heat-exchanging component, the heat exchange stream of described first heat-exchanging component and
The heat exchange stream composition of described second heat-exchanging component is described crosses cold loop, said method comprising the steps of:
Obtain the discharge superheat of described compressor；
When the discharge superheat of described compressor is less than the first preset value, if the second heat exchange stream of described first heat-exchanging component
The outlet superheat degree on road is less than the first export goal degree of superheat, then described second throttle is carried out aperture and turn control down；
When the aperture of described second throttle is adjusted to minimum aperture, if the second heat exchange stream of described first heat-exchanging component
Outlet superheat degree less than the described first export goal degree of superheat, then described minimum aperture is turned down correction, with according to institute
Outlet superheat degree and the described first export goal degree of superheat of stating the second heat exchange stream of the first heat-exchanging component continue described second
Choke valve carries out aperture and turns control down, until the discharge superheat of described compressor is more than the second preset value, wherein, and described the
Two preset values are more than described first preset value.
Multiple on-line system the most according to claim 1 is crossed the valve body control method of cold loop, it is characterised in that work as institute
When stating the discharge superheat of compressor less than the first preset value, it is judged that described compressor exists back liquid risk.
Multiple on-line system the most according to claim 1 and 2 is crossed the valve body control method of cold loop, it is characterised in that
Repair so that described minimum aperture is turned down by the current minimum aperture of described second throttle being deducted default aperture threshold value
Just.
4. according to the valve body control method of mistake cold loop, its feature in the multiple on-line system according to any one of claim 1-3
Being, described multiple on-line system is operated under main refrigeration mode or pure refrigeration mode.
5. a multiple on-line system, it is characterised in that including:
Off-premises station, described off-premises station includes compressor；
Multiple indoor sets；
Part flow arrangement, described part flow arrangement includes the first heat-exchanging component and the second heat-exchanging component, the of described first heat-exchanging component
Between the entrance of the outlet of one heat exchange stream and the first heat exchange stream of described second heat-exchanging component, first throttle valve is set, described
Arrange between the entrance of the outlet of the first heat exchange stream of the second heat-exchanging component and the second heat exchange stream of described second heat-exchanging component
Second throttle, the outlet of the second heat exchange stream of described second heat-exchanging component and the second heat exchange stream of described first heat-exchanging component
The entrance connection on road, the heat exchange stream of described first heat-exchanging component and the heat exchange stream of described second heat-exchanging component constitute described mistake
Cold loop；
Control module, described control module is used for obtaining the discharge superheat of described compressor, and in the aerofluxus of described compressor
Judge when the degree of superheat is less than the first preset value that the outlet superheat degree of the second heat exchange stream of described first heat-exchanging component is whether less than the
The one export goal degree of superheat, wherein, if the outlet superheat degree of the second heat exchange stream of described first heat-exchanging component is less than first
The export goal degree of superheat, described control module then carries out aperture and turns control down described second throttle, and at described second section
When the aperture of stream valve is adjusted to minimum aperture, if the outlet superheat degree of the second heat exchange stream of described first heat-exchanging component is less than
The described first export goal degree of superheat, described minimum aperture then turned down correction by described control module, with according to described the
The outlet superheat degree of the second heat exchange stream of one heat-exchanging component and the described first export goal degree of superheat continue described second throttling
Valve carries out aperture and turns control down, until the discharge superheat of described compressor is more than the second preset value, wherein, described second pre-
If value is more than described first preset value.
Multiple on-line system the most according to claim 5, it is characterised in that when the discharge superheat of described compressor is less than
During the first preset value, described control module judges that described compressor exists back liquid risk.
7. according to the multiple on-line system described in claim 5 or 6, it is characterised in that described control module is by by described
The current minimum aperture of two choke valves deducts default aperture threshold value so that described minimum aperture is turned down correction.
8. according to the multiple on-line system according to any one of claim 5-7, it is characterised in that described multiple on-line system is being led
It is operated under refrigeration mode or pure refrigeration mode.
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| CN201610285059.9A CN105972860B (en) | 2016-04-29 | 2016-04-29 | Multi-line system and its valve body control method for crossing cold loop |
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