CN106123227A - Multiple on-line system and control method thereof - Google Patents
Multiple on-line system and control method thereof Download PDFInfo
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- CN106123227A CN106123227A CN201610507307.XA CN201610507307A CN106123227A CN 106123227 A CN106123227 A CN 106123227A CN 201610507307 A CN201610507307 A CN 201610507307A CN 106123227 A CN106123227 A CN 106123227A
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- Prior art keywords
- degree
- restricting element
- refrigeration
- supercooling
- superheat
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
Abstract
The invention discloses a kind of multiple on-line system and control method thereof, said method comprising the steps of: obtain the discharge superheat of compressor, and judge that whether discharge superheat is less than presetting the degree of superheat；If discharge superheat is less than presetting the degree of superheat, then obtain further degree of supercooling before the valve of refrigeration restricting element, and before judging valve degree of supercooling whether less than presetting degree of supercooling；If degree of supercooling is less than presetting degree of supercooling before valve, then the aperture controlling refrigeration restricting element keeps constant, and the aperture of the indoor restricting element of the indoor set that controls to freeze in multiple indoor set turns down first and presets aperture and keep the first Preset Time.The method freeze restricting element valve before degree of supercooling less time, keep constant by controlling refrigeration restricting element, the aperture simultaneously turning down indoor restricting element corresponding to refrigeration indoor set promotes the upstream pressure of refrigeration restricting element, thus on the premise of ensureing compressor reliability service, quickly set up degree of supercooling before the valve of refrigeration restricting element.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly to control method and a kind of multi-connected machine of a kind of multiple on-line system
System.
Background technology
When multiple on-line system is run with pure refrigeration mode or main refrigeration mode, the supercool electric expansion valve in part flow arrangement
It is low-temp low-pressure coolant by the throttling of partial high pressure liquid refrigerants, then flows through heat exchanger from road with the height cooling heat exchanger main road
Pressure coolant, provides degree of supercooling for main road coolant.Therefore, the liquid that the control of supercool electric expansion valve will export with heat exchanger main road
The degree of supercooling of coolant is target.If but the degree of supercooling of the liquid refrigerants exported with heat exchanger main road merely is adjusted for controlling target
Save supercool electric expansion valve, then there is problems in that
One, supercool electric expansion valve directly connects return-air side, if when reaching the target degree of supercooling set, supercool electricity
The aperture of sub-expansion valve is too small, then heat exchanger is after way outlet coolant and main road coolant heat exchange, and the degree of superheat is excessive, and in cool room
After the outlet coolant mixing of machine so that the return-air degree of superheat is relatively big, thus causes compressor exhaust temperature persistently to rise, impact compression
The reliability of machine.
Its two, the degree of supercooling of liquid refrigerants and the aperture of supercool electric expansion valve of the outlet of heat exchanger main road are not dullness
Dependency relation, when the aperture of supercool electric expansion valve is gradually opened big, before valve during stable state, degree of supercooling can first increases and then decreases.?
In some cases (at the end of oil return), when the aperture of supercool electric expansion valve is opened big, the degree of supercooling of heat exchanger main road outlet
Can be the most delayed, if now controlled according to target degree of supercooling, supercool electric expansion valve can persistently be held big until all
Open.Owing to the upstream pressure of supercool electric expansion valve reduces, and throttle effect weakens, in heat exchanger heat transfer temperature difference significantly under
Fall, does not has degree of supercooling on the contrary before valve, will appear from freezing the problems such as shunting inequality between indoor set, throttling noise increase.
In correlation technique, when there is no degree of supercooling before the valve of supercool electric expansion valve, by the aperture of supercool electric expansion valve
Turn down, to improve upstream pressure, so that coolant is liquid before valve.But the throttling due to supercool electric expansion valve Yu indoor set
Valve is parallel relationship, if during supercool electric expansion valve turns down, the throttle valve opening of indoor set increases, then can cause
There is the technical problem of degree of supercooling before valve in this strategy fails or be difficult to.
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, it is an object of the present invention to propose the control method of a kind of multiple on-line system, the method is at refrigeration joint
When degree of supercooling is less before the valve of fluid element, keeps constant by controlling refrigeration restricting element, turn down refrigeration indoor set corresponding simultaneously
The aperture of indoor restricting element promote the upstream pressure of refrigeration restricting element, thus ensureing the bar of compressor reliability service
Under part, quickly set up degree of supercooling before the valve of refrigeration restricting element.
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 control method of a kind of multiple on-line system, described
Multiple on-line system includes off-premises station, part flow arrangement and multiple indoor set, and described off-premises station includes compressor, described part flow arrangement bag
Include major loop, cooling circuit and be arranged on described major loop outlet with described cooling circuit entrance between refrigeration throttling unit
Part, described refrigeration restricting element is used for when described multiple on-line system is run with main refrigeration mode or pure refrigeration mode entering institute
The coolant stating cooling circuit carries out the control that throttles, and in the plurality of indoor set, each indoor set is correspondingly arranged on indoor throttling unit
Part, said method comprising the steps of: obtains the discharge superheat of described compressor, and judges that described discharge superheat is the least
In the default degree of superheat；If described discharge superheat is less than the described default degree of superheat, then obtain described throttling unit of freezing further
Degree of supercooling before the valve of part, and judge that whether degree of supercooling is less than presetting degree of supercooling before described valve；And if degree of supercooling before described valve
Less than described default degree of supercooling, then the aperture controlling described refrigeration restricting element keeps constant, and controls the plurality of indoor set
The aperture of the indoor restricting element of middle refrigeration indoor set turns down first and presets aperture and keep the first Preset Time.
The control method of multiple on-line system according to embodiments of the present invention, in multiple on-line system with pure refrigeration mode or master
When refrigeration mode runs, obtain the discharge superheat of compressor, and judge that whether discharge superheat is less than presetting the degree of superheat.If
Discharge superheat less than presetting the degree of superheat, then obtains further degree of supercooling before the valve of refrigeration restricting element, and supercool before judging valve
Whether degree is less than presetting degree of supercooling.If degree of supercooling is less than presetting degree of supercooling before valve, then the aperture controlling refrigeration restricting element is protected
Hold constant, and the aperture of the indoor restricting element of the indoor set that controls to freeze in multiple indoor set turns down first and presets aperture and holding
First Preset Time, effectively promotes the upstream pressure of refrigeration restricting element, thus on the premise of ensureing compressor reliability service,
Quickly set up degree of supercooling before the valve of refrigeration restricting element.
According to one embodiment of present invention, when described discharge superheat is more than or equal to the described default degree of superheat, according to
Described refrigeration restricting element is controlled by the target outlet degree of superheat of described cooling circuit, and controls described refrigeration indoor set
The aperture of indoor restricting element is opened big second and is preset aperture and keep the second Preset Time.
According to one embodiment of present invention, when before described valve, degree of supercooling is more than or equal to described default degree of supercooling, according to
Described refrigeration restricting element is controlled by the target outlet degree of superheat of described cooling circuit, and according to each refrigeration indoor set
The indoor restricting element of corresponding refrigeration indoor set is controlled by throttling control strategy.
According to one embodiment of present invention, the control method of above-mentioned multiple on-line system, also include: judge described compression
The startup stage that whether machine being in；If described compressor is in, then controls described refrigeration restricting element and keep the 3rd
Preset aperture constant.
For reaching above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of multiple on-line system, including: off-premises station,
Described off-premises station includes compressor；Part flow arrangement, described part flow arrangement includes major loop, cooling circuit and is arranged on described master
Refrigeration restricting element between circuit outlet and described cooling circuit entrance, described refrigeration restricting element is at described multi-connected machine
System carries out, to the coolant entering described cooling circuit, the control that throttles when running with main refrigeration mode or pure refrigeration mode；Multiple rooms
Interior machine, in the plurality of indoor set, each indoor set is correspondingly arranged on indoor restricting element；Control module, described control module is used
In obtaining the discharge superheat of described compressor, and judge described discharge superheat whether less than presetting the degree of superheat, wherein, if
Described discharge superheat is less than the described default degree of superheat, and described control module obtains the valve of described refrigeration restricting element the most further
Front degree of supercooling, and judge that whether degree of supercooling is less than presetting degree of supercooling before described valve, and before described valve degree of supercooling less than described
When presetting degree of supercooling, the aperture controlling described refrigeration restricting element keeps constant, and controls cool room in the plurality of indoor set
The aperture of the indoor restricting element of interior machine turns down first and presets aperture and keep the first Preset Time.
Multiple on-line system according to embodiments of the present invention, transports with pure refrigeration mode or main refrigeration mode in multiple on-line system
During row, control module obtains the discharge superheat of compressor, and judges that whether discharge superheat is less than presetting the degree of superheat.If row
The gas degree of superheat less than presetting the degree of superheat, then obtains degree of supercooling before the valve of refrigeration restricting element further, and judges degree of supercooling before valve
Whether less than presetting degree of supercooling.If degree of supercooling is less than presetting degree of supercooling before valve, then the aperture controlling refrigeration restricting element keeps
Constant, and the aperture of the indoor restricting element of the indoor set that controls to freeze in multiple indoor set turns down first and presets aperture and keep the
One Preset Time, effectively promotes the upstream pressure of refrigeration restricting element, thus on the premise of ensureing compressor reliability service, soon
Run-up stand refrigeration restricting element valve before degree of supercooling.
According to one embodiment of present invention, when described discharge superheat is more than or equal to the described default degree of superheat, described
Described refrigeration restricting element is controlled by control module according to the target outlet degree of superheat of described cooling circuit, and controls described
The aperture of the indoor restricting element of refrigeration indoor set is opened big second and is preset aperture and keep the second Preset Time.
According to one embodiment of present invention, when before described valve, degree of supercooling is more than or equal to described default degree of supercooling, described
Described refrigeration restricting element is controlled by control module according to the target outlet degree of superheat of described cooling circuit, and according to each
The indoor restricting element of corresponding refrigeration indoor set is controlled by the throttling control strategy of refrigeration indoor set.
According to one embodiment of present invention, described control module also judges the startup stage that whether described compressor being in,
And control described refrigeration restricting element time judging that described compressor is in startup stage and keep the 3rd to preset aperture constant.
Accompanying drawing explanation
Fig. 1 is the structural representation of multiple on-line system according to an embodiment of the invention；
Fig. 2 is the flow chart of the control method of multiple on-line system according to embodiments of the present invention；And
Fig. 3 is the flow chart of the control method of multiple on-line system according to an embodiment of the invention.
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 from start to finish
Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached
The embodiment that figure describes is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings control method and the multi-connected machine system of the multiple on-line system that the embodiment of the present invention proposes are described
System.
In an embodiment of the present invention, multiple on-line system includes off-premises station 100, part flow arrangement 200, multiple indoor set 300
With control module (in figure not specifically illustrated), off-premises station 100 includes that compressor 1, part flow arrangement 200 include major loop, cool back
Road and be arranged on the refrigeration restricting element 21 between major loop outlet and cooling circuit entrance, refrigeration restricting element 21 for
When multiple on-line system is run with main refrigeration mode or pure refrigeration mode, the coolant entering cooling circuit is carried out the control that throttles, multiple
In indoor set 300, each indoor set 300 is correspondingly arranged on indoor restricting element.
Specifically, as it is shown in figure 1, off-premises station 100 include outdoor heat exchanger 1, cross valve 2, compressor 3, fluid reservoir 4 and
Four check valves 5,6,7 and 8, wherein, compressor 3 has air vent and gas returning port, the air vent of compressor 3 and cross valve 2
First valve port is connected, and the gas returning port of compressor 3 is connected with one end of fluid reservoir 4, the of the other end of fluid reservoir 4 and cross valve 2
Two valve ports be connected, one end of outdoor heat exchanger 1 is connected with the 3rd valve port of cross valve 2, the other end of outdoor heat exchanger 1 respectively with
The outlet of check valve 7 is connected with the entrance of check valve 8, the 4th valve port of cross valve 2 respectively with outlet and the check valve of check valve 5
The entrance of 6 is connected.
Part flow arrangement 200 includes gas-liquid separator 13, First Heat Exchanger the 14, second heat exchanger 20, electric expansion valve 15, system
21, four electromagnetic valves 9,10,11 and 12 of cold restricting element and four check valves 16,17,18 and 19.Wherein, First Heat Exchanger 14
The entrance of the first heat exchange stream be connected with the first end of gas-liquid separator 13, going out of the first heat exchange stream of First Heat Exchanger 14
Mouth is connected with the entrance of the first heat exchange stream of the second heat exchanger 20 by after electric expansion valve 15, the first of the second heat exchanger 20
The outlet of heat exchange stream is connected with the entrance of the second heat exchange stream of the second heat exchanger 20 by refrigeration restricting element 21, and second changes
The outlet of the second heat exchange stream of hot device 20 is connected with the entrance of the second heat exchange stream of First Heat Exchanger 14, First Heat Exchanger 14
The outlet of the second heat exchange stream be connected with the low-voltage tube of off-premises station 100.First Heat Exchanger 14 and the second heat exchanger 20 can be
Plate type heat exchanger, refrigeration restricting element 21 can be electric expansion valve.
Multiple indoor sets 300 include the first indoor set and the second indoor set, and the first indoor set includes the first indoor heat exchanger
22 and the first indoor restricting element 23, the second indoor set includes the second indoor heat exchanger 24 and the second indoor restricting element 25.Point
Stream device 200 is by four electromagnetic valves 9,10,11 and 12 and four check valves 16,17,18 and 19 and multiple indoor set 300 phases
Even.
It should be noted that in part flow arrangement 200, the first heat exchange stream of First Heat Exchanger 14 and the second heat exchanger 20
The first heat exchange stream constitute the major loop of part flow arrangement 200, and the outlet of the first heat exchange stream of the second heat exchanger 20
Constitute as the outlet of major loop, the second heat exchange stream of the second heat exchanger 20 and the second heat exchange stream of First Heat Exchanger 14
The cooling circuit of part flow arrangement 200, and the entrance of the second heat exchange stream of the second heat exchanger 20 is as the entrance of cooling circuit.
When multiple on-line system is run with pure refrigeration mode or main refrigeration mode, from the air vent of compressor 3 out
After High Temperature High Pressure coolant is condensed by outdoor heat exchanger 1, enter gas-liquid separator 13 by check valve 8, from gas-liquid separator 13
The first high-pressure liquid coolant brought out after the major loop of part flow arrangement 200, a part by check valve 17 and 19 enter
Refrigeration indoor set, another part enters cooling circuit through refrigeration restricting element 21, from the coolant of cooling circuit outflow and from refrigeration
After the coolant that indoor set flows out converges, by entering fluid reservoir 4 after check valve 5 and cross valve 2, eventually pass back to returning of compressor 3
QI KOU, completes kind of refrigeration cycle.
In multiple on-line system with in pure refrigeration mode or main refrigeration mode running, if exported with major loop merely
Liquid refrigerants degree of supercooling for control target regulate refrigeration restricting element 21, then reach set target degree of supercooling time,
If the aperture of refrigeration restricting element 21 is too small, after the outlet coolant of cooling circuit and main refrigerant circuit heat exchange, the degree of superheat is excessive,
After converging with the coolant flowed out from refrigeration indoor set so that the return-air degree of superheat is relatively big, causes the delivery temperature of compressor 3 persistently to go up
Rise, affect the reliability of compressor 3.Further, in some cases, when the aperture of the restricting element 21 that freezes is opened big, major loop
The degree of supercooling of outlet can be the most delayed, if now controlled according to target degree of supercooling, refrigeration restricting element 21 can continue
Open big until fully open.Owing to the upstream pressure of refrigeration restricting element 21 reduces, and throttle effect weakens, major loop and cooling
The heat transfer temperature difference in loop declines to a great extent, and does not has degree of supercooling on the contrary before refrigeration restricting element 21 valve, will appear from freezing between indoor set and divides
Stream inequality, throttle the problems such as noise increase.
To this end, in an embodiment of the present invention, control module is for obtaining the discharge superheat of compressor 3, and judges row
Whether the gas degree of superheat is less than presetting the degree of superheat, and wherein, if discharge superheat is less than presetting the degree of superheat, control module is further
Obtain degree of supercooling before the valve of refrigeration restricting element 21, and judge that whether degree of supercooling is less than presetting degree of supercooling before valve, and before valve
Degree of supercooling is less than when presetting degree of supercooling, and the aperture controlling refrigeration restricting element 21 keeps constant, and controls in multiple indoor set 300
The aperture of the indoor restricting element of refrigeration indoor set turns down first and presets aperture and keep the first Preset Time.
In one embodiment of the invention, control module also judges the startup stage that whether compressor 3 being in, and is judging
Control refrigeration restricting element 21 time startup stage that compressor 3 being in keep the 3rd to preset aperture constant.
In an embodiment of the present invention, preset the degree of superheat, preset degree of supercooling, first preset aperture, the 3rd preset aperture and
First Preset Time all can be demarcated according to practical situation.
Specifically, (off-premises station is in Heat release mode) is run in multiple on-line system with pure refrigeration mode or main refrigeration mode
Time, if compressor 3 is in, control module the most first controls refrigeration restricting element 21 and keeps the 3rd to preset aperture A3 not
Become, when compressor 3 be in normal frequency control the stage time, then obtain the discharge superheat DSH of compressor 3, and judge aerofluxus
Whether temperature DSH is less than presetting degree of superheat D1.When discharge superheat DSH is less than when presetting degree of superheat D1, and control module also judges
Before the valve of refrigeration restricting element 21, whether degree of supercooling SCM is less than presetting degree of supercooling S1, if degree of supercooling SCM is less than presetting before valve
Cold degree S1, control module then controls the aperture of refrigeration restricting element 21 and keeps constant, and controls all refrigeration in multiple indoor set
The aperture of the indoor restricting element of indoor set turns down first and presets aperture A1, and keeps the first preset time T 1.
Owing to, when degree of supercooling is smaller before the valve of restricting element that freezes, forbidding that the aperture controlling refrigeration restricting element is opened
Greatly, turn down the aperture of the indoor restricting element of refrigeration indoor set simultaneously, be effectively improved the upstream pressure of refrigeration restricting element, from
And supercooled state can be reached as early as possible before making the valve of refrigeration restricting element, effectively prevent because of to refrigeration restricting element and indoor
When restricting element individually controls, but open the refrigeration restricting element that indoor restricting element causes when closing refrigeration restricting element
Upstream pressure promotes failed situation.Thus on the premise of compressor reliability is guaranteed, it has been rapidly completed refrigeration throttling
The foundation of degree of supercooling before element valve, it is to avoid without the situation of degree of supercooling before the valve of refrigeration restricting element.
According to one embodiment of present invention, when discharge superheat more than or equal to preset the degree of superheat time, control module according to
Refrigeration restricting element 21 is controlled by the target outlet degree of superheat of cooling circuit, and controls the indoor throttling unit of refrigeration indoor set
The aperture of part is opened big second and is preset aperture and keep the second Preset Time.Wherein, second aperture is preset and the second Preset Time is equal
Can demarcate according to practical situation.
It is to say, when discharge superheat DSH is more than or equal to when presetting degree of superheat D1, and refrigeration restricting element 21 enters cooling
The circuit outlet degree of superheat controls, and i.e. control module is according to target outlet degree of superheat CSHS of cooling circuit (i.e. First Heat Exchanger
The target superheat degree in the exit of the second heat exchange stream) refrigeration restricting element 21 is controlled, control ownership cold house simultaneously
The aperture of the indoor restricting element of interior machine is opened big second and is preset aperture A2, and keeps the second preset time T 2.
According to one embodiment of present invention, when before valve degree of supercooling more than or equal to preset degree of supercooling time, control module according to
Refrigeration restricting element 21 is controlled by the target outlet degree of superheat of cooling circuit, and according to the throttling control of each refrigeration indoor set
The indoor restricting element of corresponding refrigeration indoor set is controlled by system strategy.
It is to say, when before the valve of the restricting element that freezes, degree of supercooling SCM is more than or equal to when presetting degree of supercooling S1, and refrigeration throttles
Element 21 enters cooling circuit outlet superheat degree and controls, and i.e. control module is according to target outlet degree of superheat CSHS pair of cooling circuit
Refrigeration restricting element 21 is controlled, and meanwhile, control module controls plan according to the throttling of the most each refrigeration indoor set
Slightly the indoor restricting element of corresponding refrigeration indoor set is controlled.
In sum, multiple on-line system according to embodiments of the present invention, in multiple on-line system with pure refrigeration mode or master
When refrigeration mode runs, control module is according to degree of supercooling before the discharge superheat of compressor, the valve of refrigeration restricting element and divides
In stream device, the indoor restricting element of refrigeration restricting element and refrigeration indoor set is carried out by the target outlet degree of superheat of cooling circuit
Coordinated signals, and when degree of supercooling is less before the valve of restricting element that freezes, keep constant, simultaneously by controlling refrigeration restricting element
The aperture turning down indoor restricting element corresponding to refrigeration indoor set promotes the upstream pressure of refrigeration restricting element, thus is ensureing
On the premise of compressor reliability service, quickly set up degree of supercooling before the valve of refrigeration restricting element.
Fig. 2 is the flow chart of the control method of multiple on-line system according to embodiments of the present invention.
In an embodiment of the present invention, multiple on-line system includes off-premises station, part flow arrangement and multiple indoor set, off-premises station bag
Including compressor, part flow arrangement includes major loop, cooling circuit and is arranged between major loop outlet and cooling circuit entrance
Refrigeration restricting element, refrigeration restricting element is used for when multiple on-line system is run with main refrigeration mode or pure refrigeration mode entrance
The coolant of cooling circuit carries out the control that throttles, and in multiple indoor sets, each indoor set is correspondingly arranged on indoor restricting element.Specifically
Already described above, repeat no more here.
As in figure 2 it is shown, the control method of this multiple on-line system can comprise the following steps that
S1, obtains the discharge superheat of compressor, and judges that whether discharge superheat is less than presetting the degree of superheat.
In one embodiment of the invention, the control method of above-mentioned multiple on-line system also includes: judge that compressor is
No startup stage be in；If compressor is in, then it is constant that aperture is preset in control refrigeration restricting element holding the 3rd.
Specifically, when multiple on-line system is run with pure refrigeration mode or main refrigeration mode, open if compressor is in
In the dynamic stage, it is constant that aperture A3 is preset in the most first control refrigeration restricting element holding the 3rd, controls rank when compressor is in normal frequency
Duan Shi, then obtain the discharge superheat DSH of compressor, and judge that whether discharge superheat DSH is less than presetting degree of superheat D1.
S2, if discharge superheat is less than presetting the degree of superheat, then obtains degree of supercooling before the valve of refrigeration restricting element further,
And whether degree of supercooling is less than default degree of supercooling before judging valve.
S3, if degree of supercooling is less than presetting degree of supercooling before valve, then the aperture controlling refrigeration restricting element keeps constant, and controls
The aperture of the indoor restricting element making the indoor set that freezes in multiple indoor set turns down first and presets aperture and keep first when presetting
Between.
Specifically, when discharge superheat DSH is less than when presetting degree of superheat D1, supercool before also judging the valve of refrigeration restricting element
Degree SCM, whether less than presetting degree of supercooling S1, if degree of supercooling SCM is less than default degree of supercooling S1 before valve, then controls refrigeration throttling first
The aperture of part keeps constant, and controls the aperture of the indoor restricting element of the cold indoor set of the ownership in multiple indoor set and turn down first
Preset aperture A1, and keep the first preset time T 1.
Owing to, when degree of supercooling is smaller before the valve of restricting element that freezes, forbidding that the aperture controlling refrigeration restricting element is opened
Greatly, turn down the aperture of the indoor restricting element of refrigeration indoor set simultaneously, be effectively improved the upstream pressure of refrigeration restricting element, from
And supercooled state can be reached as early as possible before making the valve of refrigeration restricting element, effectively prevent because of to refrigeration restricting element and indoor
When restricting element individually controls, but open the refrigeration restricting element that indoor restricting element causes when closing refrigeration restricting element
Upstream pressure promotes failed situation.Thus on the premise of compressor reliability is guaranteed, it has been rapidly completed refrigeration throttling
The foundation of degree of supercooling before element valve, it is to avoid without the situation of degree of supercooling before the valve of refrigeration restricting element.
According to one embodiment of present invention, when discharge superheat is more than or equal to when presetting the degree of superheat, according to cooling circuit
The target outlet degree of superheat refrigeration restricting element is controlled, and the aperture of indoor restricting element of the indoor set that controls to freeze is opened
Big second presets aperture and keeps the second Preset Time.
It is to say, if discharge superheat DSH is more than or equal to presetting degree of superheat D1, refrigeration restricting element enters and cools back
The way outlet degree of superheat controls, and is i.e. controlled refrigeration restricting element according to target outlet degree of superheat CSHS of cooling circuit, with
Time control the aperture of indoor restricting element of the cold indoor set of the ownership and open big second and preset aperture A2, and keep the second Preset Time
T2。
According to one embodiment of present invention, when before valve, degree of supercooling is more than or equal to when presetting degree of supercooling, according to cooling circuit
The target outlet degree of superheat refrigeration restricting element is controlled, and according to the throttling control strategy of each refrigeration indoor set to phase
The indoor restricting element of the refrigeration indoor set answered is controlled.
If it is to say, degree of supercooling SCM is more than or equal to presetting degree of supercooling S1 before the valve of refrigeration restricting element, refrigeration throttling
Element enters cooling circuit outlet superheat degree and controls, i.e. target outlet degree of superheat CSHS according to cooling circuit is first to refrigeration throttling
Part is controlled, and the throttling control strategy of the most each refrigeration indoor set of basis is to corresponding refrigeration indoor set simultaneously
Indoor restricting element is controlled.
For making those skilled in the art more clearly understand the present invention, Fig. 3 is many according to one concrete example of the present invention
The flow chart of the control method of on-line system.As it is shown on figure 3, the control method of multiple on-line system comprises the following steps:
S101, off-premises station runs with Heat release mode.
S102, it is judged that whether compressor enters normal frequency control period.If it is, perform step S104；If it does not, hold
Row step S103.
S103, it is constant that aperture A3 is preset in control refrigeration restricting element holding the 3rd.
S104, it is judged that whether DSH ＜ D1 sets up.If it is, perform step S106；If it does not, perform step S105.
S105, is controlled refrigeration restricting element according to target outlet degree of superheat CSHS of cooling circuit, and controls system
The aperture of the indoor restricting element of cold indoor set is opened big second and is preset aperture A2 and keep the second preset time T 2.
S106, it is judged that whether SCM >=S1 sets up.If it is, perform step S107；If it does not, perform step S108.
S107, is controlled refrigeration restricting element according to target outlet degree of superheat CSHS of cooling circuit, and according to often
The indoor restricting element of corresponding refrigeration indoor set is controlled by the throttling control strategy of individual refrigeration indoor set.
S108, the aperture controlling refrigeration restricting element keeps constant, and the room of the indoor set that controls to freeze in multiple indoor set
The aperture of interior restricting element turns down first and presets aperture A1 and keep the first preset time T 1.
In sum, the control method of multiple on-line system according to embodiments of the present invention, in multiple on-line system with pure refrigeration
When pattern or main refrigeration mode run, according to degree of supercooling before the discharge superheat of compressor, the valve of refrigeration restricting element and
In part flow arrangement, the indoor restricting element of refrigeration restricting element and refrigeration indoor set is entered by the target outlet degree of superheat of cooling circuit
Row coordinated signals, and when degree of supercooling is less before the valve of restricting element that freezes, keep constant by controlling refrigeration restricting element, with
The aperture of the indoor restricting element that Shi Guan little refrigeration indoor set is corresponding promotes the upstream pressure of refrigeration restricting element, thus is protecting
On the premise of card compressor reliability service, quickly set up degree of supercooling before the valve of refrigeration restricting element.
In describing the invention, it is to be understood that term " first ", " second " are only used for describing purpose, and can not
It is interpreted as instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the
One ", the feature of " second " can express or implicitly include at least one this feature.In describing the invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " etc.
Term 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 that machinery connects
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, in can being two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For those of ordinary skill in the art
For, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office
One or more embodiments 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 tied by art personnel
Close 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 example
Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, revises, replaces and modification.
Claims (8)
1. the control method of a multiple on-line system, it is characterised in that described multiple on-line system include off-premises station, part flow arrangement and
Multiple indoor sets, described off-premises station includes that compressor, described part flow arrangement include major loop, cooling circuit and be arranged on described
Refrigeration restricting element between major loop outlet and described cooling circuit entrance, described refrigeration restricting element is for described multi-joint
When machine system is run with main refrigeration mode or pure refrigeration mode, the coolant entering described cooling circuit is carried out the control that throttles, described
In multiple indoor sets, each indoor set is correspondingly arranged on indoor restricting element, said method comprising the steps of:
Obtain the discharge superheat of described compressor, and judge that whether described discharge superheat is less than presetting the degree of superheat；
If described discharge superheat is less than the described default degree of superheat, then obtain mistake before the valve of described refrigeration restricting element further
Cold degree, and judge that whether degree of supercooling is less than presetting degree of supercooling before described valve；And
If degree of supercooling is less than described default degree of supercooling before described valve, then the aperture controlling described refrigeration restricting element keeps not
Become, and the aperture of the indoor restricting element of the indoor set that controls to freeze in the plurality of indoor set turns down first and presets aperture and holding
First Preset Time.
The control method of multiple on-line system the most according to claim 1, it is characterised in that when described discharge superheat is more than
During equal to the described default degree of superheat, according to the target outlet degree of superheat of described cooling circuit, described refrigeration restricting element is controlled
System, and the aperture controlling the indoor restricting element of described refrigeration indoor set opens big second and presets aperture and keep second when presetting
Between.
The control method of multiple on-line system the most according to claim 1, it is characterised in that when before described valve, degree of supercooling is more than
During equal to described default degree of supercooling, according to the target outlet degree of superheat of described cooling circuit, described refrigeration restricting element is controlled
System, and according to the throttling control strategy of each refrigeration indoor set, the indoor restricting element of corresponding refrigeration indoor set is controlled
System.
4. according to the control method of the multiple on-line system according to any one of claim 1-3, it is characterised in that also include:
Judge the startup stage that whether described compressor being in；
If described compressor is in, then controls described refrigeration restricting element and keep the 3rd to preset aperture constant.
5. a multiple on-line system, it is characterised in that including:
Off-premises station, described off-premises station includes compressor；
Part flow arrangement, described part flow arrangement include major loop, cooling circuit and be arranged on described major loop outlet cold with described
But the refrigeration restricting element between circuit entrance, described refrigeration restricting element is used in described multiple on-line system with main refrigeration mode
Or during pure refrigeration mode operation, the coolant entering described cooling circuit is carried out the control that throttles；
Multiple indoor sets, in the plurality of indoor set, each indoor set is correspondingly arranged on indoor restricting element；
Control module, described control module is for obtaining the discharge superheat of described compressor, and judges described discharge superheat
Whether less than presetting the degree of superheat, wherein, if described discharge superheat is less than the described default degree of superheat, described control module is then entered
One step obtains degree of supercooling before the valve of described refrigeration restricting element, and judges that whether degree of supercooling is less than presetting degree of supercooling before described valve,
And when before described valve, degree of supercooling is less than described default degree of supercooling, the aperture controlling described refrigeration restricting element keeps constant,
And the aperture of the indoor restricting element of the indoor set that controls to freeze in the plurality of indoor set turns down first and presets aperture and keep the
One Preset Time.
Multiple on-line system the most according to claim 5, it is characterised in that when described discharge superheat is more than or equal to described pre-
If during the degree of superheat, described refrigeration restricting element is carried out by described control module according to the target outlet degree of superheat of described cooling circuit
Control, and the aperture controlling the indoor restricting element of described refrigeration indoor set is opened big second and preset aperture and keep second when presetting
Between.
Multiple on-line system the most according to claim 5, it is characterised in that when before described valve, degree of supercooling is more than or equal to described pre-
If during degree of supercooling, described refrigeration restricting element is carried out by described control module according to the target outlet degree of superheat of described cooling circuit
Control, and according to the throttling control strategy of each refrigeration indoor set, the indoor restricting element of corresponding refrigeration indoor set is controlled
System.
8. according to the multiple on-line system according to any one of claim 5-7, it is characterised in that described control module also judges institute
State compressor startup stage whether be in, and control described refrigeration restricting element time judging that described compressor is in startup stage
Keeping the 3rd, to preset aperture constant.
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| CN106766326A (en) * | 2016-11-24 | 2017-05-31 | 广东美的暖通设备有限公司 | Multiple on-line system and its refrigeration in press restricting element control method |
| WO2018001183A1 (en) * | 2016-06-28 | 2018-01-04 | 广东美的暖通设备有限公司 | Multi-split system and control method thereof |
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| CN110726225A (en) * | 2019-10-12 | 2020-01-24 | 广东美的暖通设备有限公司 | Multi-split system and control method thereof |
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