CN105865074B - Multi-line system and its control method for heating restricting element - Google Patents
Multi-line system and its control method for heating restricting element Download PDFInfo
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- CN105865074B CN105865074B CN201610264509.6A CN201610264509A CN105865074B CN 105865074 B CN105865074 B CN 105865074B CN 201610264509 A CN201610264509 A CN 201610264509A CN 105865074 B CN105865074 B CN 105865074B
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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
- F25B30/00—Heat pumps
Abstract
The invention discloses a kind of multi-line system and its control methods of heating restricting element, the described method comprises the following steps：The heating that any one heating indoor unit is sent out in receiving multiple indoor units can take, and obtain the target exhaust pressure or the corresponding saturation temperature of target exhaust pressure of compressor, and obtain current outdoor environment temperature；Compressor is controlled to obtain the current exhaust degree of superheat of compressor after compressor stable operation according to target exhaust pressure or target exhaust pressure corresponding saturation temperature；And the target exhaust degree of superheat of compressor is obtained according to current outdoor environment temperature, and the aperture for heating restricting element is adjusted according to the target exhaust degree of superheat and the current exhaust degree of superheat.This method can be directed to different outdoor environment temperatures, and reach maximum in the running frequency of compressor, ensure that the heating effect of system reaches more excellent, and keep higher efficiency.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly to the control method of restricting element is heated in a kind of multi-line system
And a kind of multi-line system.
Background technology
When air-conditioning system heating operation, outdoor unit is evaporator, and indoor unit is condenser.
For air-conditioning system, especially multi-line system, in heating operation, need to control heating electric expansion valve
Aperture could meet the energy need of different heating indoor units.Even the same heating indoor unit, in identical chamber under operating mode, when
Outdoor environment temperature changes, it is also desirable to which the aperture to heating electric expansion valve is adjusted in real time, so that the interior function
Enough reach better heating effect.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
One purpose is to propose to heat the control method of restricting element in a kind of multi-line system, can be directed to different outdoor environment temperature
Degree, and reach maximum in the running frequency of compressor, ensure that the heating effect of system reaches more excellent, and keep higher
Efficiency.
It is another object of the present invention to propose a kind of multi-line system.
To achieve the above object, one aspect of the present invention embodiment proposes heating restricting element in a kind of multi-line system
Control method, the multi-line system include outdoor unit and multiple indoor units, and the outdoor unit includes compressor, the multiple room
Indoor unit is heated in interior machine and is correspondingly arranged heating restricting element, and the heating restricting element is to entering the cold of heating indoor unit
Matchmaker carries out throttling control, the described method comprises the following steps：In receiving the multiple indoor unit in any one heating chamber
The heating that machine is sent out can take, and obtain the target exhaust pressure or the corresponding saturation of the target exhaust pressure of the compressor
Temperature, and obtain current outdoor environment temperature；It is corresponding full according to the target exhaust pressure or the target exhaust pressure
The compressor is controlled to obtain the current exhaust mistake of the compressor after the compressor stable operation with temperature
Temperature；And the target exhaust degree of superheat of the compressor is obtained according to the current outdoor environment temperature, and according to the mesh
The aperture of the heating restricting element is adjusted in mark discharge superheat and the current exhaust degree of superheat.
The control method that restricting element is heated in multi-line system according to the ... of the embodiment of the present invention, is receiving multiple interiors
The heating that any one heating indoor unit is sent out in machine can take, and obtain the target exhaust pressure or target exhaust pressure of compressor
The corresponding saturation temperature of power, and current outdoor environment temperature is obtained, then according to target exhaust pressure or target exhaust pressure
Corresponding saturation temperature controls compressor, and the current exhaust after compressor stable operation, to obtain compressor overheats
Degree, and obtain according to current outdoor environment temperature the target exhaust degree of superheat of compressor, finally, according to the target exhaust degree of superheat and
The aperture for heating restricting element is adjusted in the current exhaust degree of superheat, so as to be directed to different outdoor environment temperatures, and
In the case of the running frequency of compressor reaches maximum, ensure that the heating effect of system reaches more excellent, and keeps higher efficiency.
According to one embodiment of present invention, it is obtained by the following formula the target exhaust degree of superheat of the compressor：
DSHm=A × (Pc-Pe)+B,
Wherein, DSHm is the target exhaust degree of superheat of the compressor, and A=C × T0+D, T0 are the current outdoor environment
Temperature, Pc are the current exhaust pressure of the compressor after the compressor stable operation, and Pe is the compressor stable operation
The current back pressure of the compressor afterwards, A, B, C and D are design factor.
According to one embodiment of present invention, it is obtained by the following formula the target exhaust degree of superheat of the compressor：
DSHm=A × (Tc-Te)+B,
Wherein, DSHm is the target exhaust degree of superheat of the compressor, and A=C × T0+D, T0 are the current outdoor environment
Temperature, Tc are the corresponding saturation temperature of current exhaust pressure of the compressor after the compressor stable operation, and Te is described
The corresponding saturation temperature of current back pressure of the compressor after compressor stable operation, A, B, C and D are design factor.
According to one embodiment of present invention, described according to the target exhaust degree of superheat and the current exhaust degree of superheat
The aperture of the heating restricting element is adjusted, including：If the current exhaust degree of superheat is less than the target exhaust
The degree of superheat, the then aperture for controlling the heating restricting element are gradually turned down；If the current exhaust degree of superheat is more than the mesh
Discharge superheat is marked, then the aperture for controlling the heating restricting element gradually tunes up.
According to one embodiment of present invention, it is obtained by the following formula the current exhaust degree of superheat of the compressor：
DSH=Tp-Tc,
Wherein, DSH is the current exhaust degree of superheat of the compressor, and Tp is the compression after the compressor stable operation
The current exhaust gas temperature of machine, Tc are the corresponding saturation temperature of current exhaust pressure of the compressor after the compressor stable operation
Degree.
To achieve the above object, another aspect of the present invention embodiment proposes a kind of multi-line system, including：Outdoor unit,
The outdoor unit includes compressor；Multiple indoor units, heating indoor unit is correspondingly arranged heating throttling member in the multiple indoor unit
Part, the heating restricting element into the refrigerant of heating indoor unit to carrying out throttling control；And control module, the control
The heating that any one heating indoor unit is sent out in receiving the multiple indoor unit of molding block can take, and obtain the compression
The target exhaust pressure of machine or the corresponding saturation temperature of the target exhaust pressure, and current outdoor environment temperature is obtained, institute
Control module is stated according to the target exhaust pressure or the corresponding saturation temperature of the target exhaust pressure to the compressor
It is controlled to obtain the current exhaust degree of superheat of the compressor after the compressor stable operation, and according to described current
Outdoor environment temperature obtains the target exhaust degree of superheat of the compressor, and according to the target exhaust degree of superheat and described works as
The aperture of the heating restricting element is adjusted in the front exhaust degree of superheat.
Multi-line system according to the ... of the embodiment of the present invention, any one heating indoor unit hair in receiving multiple indoor units
The heating gone out can take, and control module obtains the target exhaust pressure or the corresponding saturation temperature of target exhaust pressure of compressor
Degree, and current outdoor environment temperature is obtained, then according to target exhaust pressure or the corresponding saturation temperature of target exhaust pressure
Compressor is controlled, after compressor stable operation, to obtain the current exhaust degree of superheat of compressor, and according to working as cup
External environment temperature obtains the target exhaust degree of superheat of compressor, finally, according to the target exhaust degree of superheat and the current exhaust degree of superheat
Aperture to heating restricting element is adjusted, so as to be directed to different outdoor environment temperatures, and in the operation of compressor frequency
In the case of rate reaches maximum, ensure that the heating effect of system reaches more excellent, and keeps higher efficiency.
According to one embodiment of present invention, the control module is obtained by the following formula the target row of the compressor
The gas degree of superheat：
DSHm=A × (Pc-Pe)+B,
Wherein, DSHm is the target exhaust degree of superheat of the compressor, and A=C × T0+D, T0 are the current outdoor environment
Temperature, Pc are the current exhaust pressure of the compressor after the compressor stable operation, and Pe is the compressor stable operation
The current back pressure of the compressor afterwards, A, B, C and D are design factor.
According to one embodiment of present invention, the control module is obtained by the following formula the target row of the compressor
The gas degree of superheat：
DSHm=A × (Tc-Te)+B,
Wherein, DSHm is the target exhaust degree of superheat of the compressor, and A=C × T0+D, T0 are the current outdoor environment
Temperature, Tc are the corresponding saturation temperature of current exhaust pressure of the compressor after the compressor stable operation, and Te is described
The corresponding saturation temperature of current back pressure of the compressor after compressor stable operation, A, B, C and D are design factor.
According to one embodiment of present invention, the control module is according to the target exhaust degree of superheat and described current
When the aperture of the heating restricting element is adjusted in discharge superheat, wherein if the current exhaust degree of superheat is less than
The target exhaust degree of superheat, the aperture that the control module then controls the heating restricting element are gradually turned down；If described
The current exhaust degree of superheat is more than the target exhaust degree of superheat, and the control module then controls the aperture of the heating restricting element
Gradually tune up.
According to one embodiment of present invention, it is front-seat to be obtained by the following formula working as the compressor for the control module
The gas degree of superheat：
DSH=Tp-Tc,
Wherein, DSH is the current exhaust degree of superheat of the compressor, and Tp is the compression after the compressor stable operation
The current exhaust gas temperature of machine, Tc are the corresponding saturation temperature of current exhaust pressure of the compressor after the compressor stable operation
Degree.
Description of the drawings
Fig. 1 is the block diagram of multi-line system according to an embodiment of the invention.
Fig. 2 is the flow chart for the control method that restricting element is heated in multi-line system according to the ... of the embodiment of the present invention.
Fig. 3 is the flow for the control method that restricting element is heated in multi-line system according to an embodiment of the invention
Figure.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawings come describe in the multi-line system proposed according to embodiments of the present invention heat restricting element control
Method and multi-line system processed.
In an embodiment of the present invention, multi-line system may include outdoor unit and multiple indoor units, and outdoor unit includes pressure
Contracting machine, heating indoor unit is correspondingly arranged heating restricting element in multiple indoor units, and heating restricting element is to entering heating chamber
The refrigerant of interior machine carries out throttling control.
As shown in Figure 1, when multi-line system heating operation (including with pure heating mode operation or main heating mode transport
Row) when, the high-pressure gaseous refrigerant come out from the high-voltage tube of outdoor unit enters heating indoor unit, after heating indoor unit heat release, leads to
It crosses heating restricting element (heating electric expansion valve) and is expanded into low-pressure gaseous refrigerant and flow back to outdoor unit.It heats and transports in multi-line system
During row, the cold medium flux for entering heating indoor unit will be influenced by heating the aperture of restricting element, while influence to heat indoor unit
Condensation temperature, therefore, the suitable aperture for heating restricting element will so that heating indoor unit both has higher refrigerant stream
Amount, while higher condensation temperature is also had, to export higher heating capacity, so that the heating effect of system reaches more excellent.
Fig. 2 is the flow chart for the control method that restricting element is heated in multi-line system according to the ... of the embodiment of the present invention.Such as
Shown in Fig. 2, the control method that restricting element is heated in the multi-line system includes the following steps：
S1, the heating that any one heating indoor unit is sent out in receiving multiple indoor units can take, and obtain compressor
Target exhaust pressure or the corresponding saturation temperature of target exhaust pressure, and obtain current outdoor environment temperature.
S2, according to target exhaust pressure or the corresponding saturation temperature of target exhaust pressure to compressor controlled with
The current exhaust degree of superheat of compressor is obtained after compressor stable operation.
Specifically, when multi-line system is run with pure heating mode or main heating mode, if receiving multiple rooms
The heating that any one heating indoor unit is sent out in interior machine can need, then obtain the target exhaust pressure or target exhaust of compressor
The corresponding saturation temperature of pressure.Then, according to the pressure between target exhaust pressure and the pressure at expulsion of the compressor obtained in real time
Force difference value carries out PI (Proportional Integral, proportional integration) to compressor and adjusts, alternatively, according to target exhaust pressure
Temperature gap between the corresponding saturation temperature of power saturation temperature corresponding with the pressure at expulsion of the compressor obtained in real time is to pressure
Contracting machine carries out PI adjustings, until compressor stable operation, i.e., compressor is according to calculated target frequency stable operation.It is compressing
After machine stable operation, the current exhaust degree of superheat of compressor is obtained.
According to one embodiment of present invention, the current exhaust degree of superheat of compressor is obtained by following formula (1)：
DSH=Tp-Tc (1)
Wherein, DSH is the current exhaust degree of superheat of compressor, and Tp is the current exhaust of compressor after compressor stable operation
Temperature, Tc are the corresponding saturation temperature of current exhaust pressure of compressor after compressor stable operation.
S3, the target exhaust degree of superheat of compressor is obtained according to current outdoor environment temperature, and is overheated according to target exhaust
The aperture for heating restricting element is adjusted in degree and the current exhaust degree of superheat.
According to one embodiment of present invention, the target exhaust degree of superheat of compressor is obtained by following formula (2)：
DSHm=A × (Pc-Pe)+B (2)
Wherein, DSHm is the target exhaust degree of superheat of compressor, and A=C × T0+D, T0 are current outdoor environment temperature, Pc
For the current exhaust pressure of compressor after compressor stable operation, Pe is the current return-air pressure of compressor after compressor stable operation
Power, A, B, C and D are design factor, and design factor B, C and D can be obtained by testing.
According to one embodiment of present invention, the target exhaust degree of superheat of compressor is obtained by following formula (3)：
DSHm=A × (Tc-Te)+B (3)
Wherein, DSHm is the target exhaust degree of superheat of compressor, and A=C × T0+D, T0 are current outdoor environment temperature, Tc
For the corresponding saturation temperature of current exhaust pressure of compressor after compressor stable operation, Te is to compress after compressor stable operation
The corresponding saturation temperature of current back pressure of machine, A, B, C and D are design factor.
Specifically, after compressor stable operation, the current exhaust pressure of compressor and current back pressure are obtained, or
The corresponding saturation temperature of current exhaust pressure and the corresponding saturation temperature of current back pressure of person's compressor, while obtaining outdoor
Environment temperature, and design factor A is calculated according to outdoor environment temperature.Then by the current exhaust pressure of the compressor of acquisition,
Current back pressure and design factor A bring above-mentioned formula (2) into, to calculate mesh of the compressor under current outdoor environment temperature
Discharge superheat is marked, alternatively, the corresponding saturation temperature of the current exhaust pressure of the compressor of acquisition, current back pressure are corresponded to
Saturation temperature and design factor A bring into above-mentioned formula (3), to calculate mesh of the compressor under current outdoor environment temperature
Mark discharge superheat.Finally, the aperture for heating restricting element is carried out according to the target exhaust degree of superheat and the current exhaust degree of superheat
PI is adjusted.
According to one embodiment of present invention, according to the target exhaust degree of superheat and the current exhaust degree of superheat to heating throttling member
The aperture of part is adjusted, including：If the current exhaust degree of superheat is less than the target exhaust degree of superheat, heating restricting element is controlled
Aperture gradually turn down；If the current exhaust degree of superheat is more than the target exhaust degree of superheat, the aperture of heating restricting element is controlled
Gradually tune up.
That is, if the current exhaust degree of superheat is less than the target exhaust degree of superheat, the aperture meeting of restricting element is heated
It gradually turns down, so that the delivery temperature of compressor gradually rises, to improve the heating capacity of heating indoor unit；If when front row
The gas degree of superheat is more than the target exhaust degree of superheat, then heating the aperture of restricting element can gradually hold greatly, so that the exhaust temperature of compressor
Degree reduces, and reduces the heating capacity of heating indoor unit.Finally when the current exhaust degree of superheat is equal to the target exhaust degree of superheat, obtain
The aperture of optimal heating restricting element.
Specifically, as shown in figure 3, the control method for heating restricting element in the multi-line system of the embodiment of the present invention can be with
Include the following steps：
S101, receiving the heating that any one heating indoor unit is sent out in multiple indoor units can need.
S102 obtains current outdoor environment temperature T0.
S103 calculates design factor A=C × T0+D according to T0.
S104 obtains the target exhaust pressure Pcs (or the corresponding saturation temperature Tcs of target exhaust pressure) of compressor.
S105 carries out PI adjustings, to obtain working as new compressor according to Pcs (or Tcs) to the running frequency of compressor
Front-seat atmospheric pressure Pc (or the corresponding saturation temperature Tc of current exhaust pressure), current back pressure Pe (or current back pressures pair
The saturation temperature Te answered) and current exhaust degree of superheat DSH.
S106 calculates target exhaust degree of superheat DSHm=A × (the Pc-Pe)+B or DSHm=A × (Tc- of compressor
Te)+B。
S107 carries out PI adjustings according to the relationship between DSH and DSHm to heating restricting element.
S108, if DSH ＜ DSHm, heat restricting element aperture gradually open it is small.
S109, if DSH ＞ DSHm, the aperture for heating restricting element is gradually opened greatly.
S110, if DSH=DSHm, the aperture for heating restricting element is constant, is optimal aperture.
The control method that restricting element is heated in multi-line system according to the ... of the embodiment of the present invention, is receiving multiple interiors
The heating that any one heating indoor unit is sent out in machine can take, and obtain the target exhaust pressure or target exhaust pressure of compressor
The corresponding saturation temperature of power, and current outdoor environment temperature is obtained, then according to target exhaust pressure or target exhaust pressure
Corresponding saturation temperature controls compressor, and the current exhaust after compressor stable operation, to obtain compressor overheats
Degree, and obtain according to current outdoor environment temperature the target exhaust degree of superheat of compressor, finally, according to the target exhaust degree of superheat and
The aperture for heating restricting element is adjusted in the current exhaust degree of superheat, so as to be directed to different outdoor environment temperatures, especially
It is to reach maximum when outdoor environment temperature is relatively low, and in the running frequency of compressor, ensures the heating effect of system
Fruit reaches more excellent, and keeps higher efficiency.
Fig. 1 is the block diagram of multi-line system according to an embodiment of the invention.As shown in Figure 1, the multi-connected machine
System includes：Outdoor unit 10, multiple indoor units 20 and control module (not specifically illustrated in figure).
Wherein, outdoor unit 10 includes compressor 11.Indoor unit 21 is heated in multiple indoor units 20 is correspondingly arranged heating throttling
Element 22, heating restricting element 22 into the refrigerant of heating indoor unit 21 to carrying out throttling control.Control module is receiving
It can be taken to the heating that any one heating indoor unit 21 is sent out in multiple indoor units 20, obtain the target exhaust pressure of compressor 11
Power or the corresponding saturation temperature of target exhaust pressure, and current outdoor environment temperature is obtained, control module is according to target exhaust
Pressure or the corresponding saturation temperature of target exhaust pressure control to be obtained after 11 stable operation of compressor compressor 11
The current exhaust degree of superheat of compressor 11 is taken, and obtains the target exhaust overheat of compressor 11 according to current outdoor environment temperature
Degree, and the aperture for heating restricting element 22 is adjusted according to the target exhaust degree of superheat and the current exhaust degree of superheat.
Specifically, when multi-line system is run with pure heating mode or main heating mode, if receiving multiple rooms
Any one heating for sending out of heating indoor unit can need in interior machine, control module then obtain compressor 11 target exhaust pressure or
The corresponding saturation temperature of person's target exhaust pressure.Then, the compressor that control module is obtained according to target exhaust pressure and in real time
Pressure difference value between 11 pressure at expulsion carries out PI adjustings to compressor 11, alternatively, corresponding full according to target exhaust pressure
Temperature gap between temperature saturation temperature corresponding with the pressure at expulsion of the compressor 11 obtained in real time to compressor 11 into
Row PI is adjusted, until 11 stable operation of compressor, i.e., compressor 11 is according to calculated target frequency stable operation.In compressor
After 11 stable operations, the current exhaust degree of superheat of compressor 11 is obtained.According to one embodiment of present invention, control module passes through
Above-mentioned formula (1) obtains the current exhaust degree of superheat of compressor 11.
After 11 stable operation of compressor, the target exhaust that compressor is obtained also according to current outdoor environment temperature overheats
Degree.According to one embodiment of present invention, control module obtains the target exhaust overheat of compressor 11 by above-mentioned formula (2)
Degree.Alternatively, control module obtains the target exhaust degree of superheat of compressor 11 by above-mentioned formula (3).
Specifically, after 11 stable operation of compressor, control module obtains the current exhaust pressure of compressor 11 and works as
The corresponding saturation temperature of the current exhaust pressure of preceding back pressure or compressor 11 and the corresponding saturation temperature of current back pressure
Degree, while outdoor environment temperature is obtained, and design factor A is calculated according to outdoor environment temperature.Then, control module will obtain
Current exhaust pressure, current back pressure and the design factor A of compressor 11 bring above-mentioned formula (2) into, to calculate compression
The target exhaust degree of superheat of the machine 11 under current outdoor environment temperature, alternatively, by the current exhaust pressure of the compressor 11 of acquisition
Corresponding saturation temperature, the corresponding saturation temperature of current back pressure and design factor A are brought into above-mentioned formula (3), to calculate
Go out the target exhaust degree of superheat of the compressor 11 under current outdoor environment temperature.Finally, control module is overheated according to target exhaust
Degree and the current exhaust degree of superheat carry out PI adjustings to the aperture for heating restricting element 22.
According to one embodiment of present invention, control module is according to the target exhaust degree of superheat and the current exhaust degree of superheat pair
When the aperture of heating restricting element 22 is adjusted, wherein if the current exhaust degree of superheat is less than the target exhaust degree of superheat, control
The aperture that module then controls heating restricting element 22 is gradually turned down；If the current exhaust degree of superheat is more than the target exhaust degree of superheat,
The aperture that control module then controls heating restricting element 22 gradually tunes up.
That is, if the current exhaust degree of superheat is less than the target exhaust degree of superheat, the aperture of restricting element 22 is heated
It can gradually turn down, so that the delivery temperature of compressor 11 gradually rises, to improve the heating capacity of heating indoor unit 21；If
The current exhaust degree of superheat is more than the target exhaust degree of superheat, then heating the aperture of restricting element 22 can gradually hold greatly, so that compressor
11 delivery temperature reduces, and reduces the heating capacity of heating indoor unit 21.Finally when the current exhaust degree of superheat is equal to target exhaust
When the degree of superheat, the aperture of optimal heating restricting element 22 is obtained.
Multi-line system according to the ... of the embodiment of the present invention, any one heating indoor unit hair in receiving multiple indoor units
The heating gone out can take, and control module obtains the target exhaust pressure or the corresponding saturation temperature of target exhaust pressure of compressor
Degree, and current outdoor environment temperature is obtained, then according to target exhaust pressure or the corresponding saturation temperature of target exhaust pressure
Compressor is controlled, after compressor stable operation, to obtain the current exhaust degree of superheat of compressor, and according to working as cup
External environment temperature obtains the target exhaust degree of superheat of compressor, finally, according to the target exhaust degree of superheat and the current exhaust degree of superheat
Aperture to heating restricting element is adjusted, so as to be directed to different outdoor environment temperatures, and in the operation of compressor frequency
In the case of rate reaches maximum, ensure that the heating effect of system reaches more excellent, and keeps higher efficiency.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indicating or implies relative importance or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (6)
1. heating the control method of restricting element in a kind of multi-line system, which is characterized in that the multi-line system includes room
Outer machine and multiple indoor units, the outdoor unit include compressor, and indoor unit is heated in the multiple indoor unit and is correspondingly arranged heating
Restricting element, the heating restricting element carry out throttling control to the refrigerant to entrance heating indoor unit, the method includes
Following steps：
The heating that any one heating indoor unit is sent out in receiving the multiple indoor unit can take, and obtain the compressor
Target exhaust pressure or the corresponding saturation temperature of the target exhaust pressure, and obtain current outdoor environment temperature；
The compressor is controlled according to the target exhaust pressure or the target exhaust pressure corresponding saturation temperature
System after the compressor stable operation to obtain the current exhaust degree of superheat of the compressor；And
The target exhaust degree of superheat of the compressor is obtained according to the current outdoor environment temperature, and according to the target exhaust
The aperture of the heating restricting element is adjusted in the degree of superheat and the current exhaust degree of superheat, wherein
It is obtained by the following formula the target exhaust degree of superheat of the compressor：
DSHm=A × (Pc-Pe)+B,
Wherein, DSHm is the target exhaust degree of superheat of the compressor, and A=C × T0+D, T0 are the current outdoor environment temperature
Degree, Pc are the current exhaust pressure of the compressor after the compressor stable operation, and Pe is after the compressor stable operation
The current back pressure of the compressor, A, B, C and D are design factor；Alternatively,
It is obtained by the following formula the target exhaust degree of superheat of the compressor：
DSHm=A × (Tc-Te)+B,
Wherein, DSHm is the target exhaust degree of superheat of the compressor, and A=C × T0+D, T0 are the current outdoor environment temperature
Degree, Tc are the corresponding saturation temperature of current exhaust pressure of the compressor after the compressor stable operation, and Te is the pressure
The corresponding saturation temperature of current back pressure of the compressor after contracting machine stable operation, A, B, C and D are design factor.
2. heating the control method of restricting element in multi-line system according to claim 1, which is characterized in that described
The aperture of the heating restricting element is adjusted according to the target exhaust degree of superheat and the current exhaust degree of superheat, is wrapped
It includes：
If the current exhaust degree of superheat is less than the target exhaust degree of superheat, the aperture of the heating restricting element is controlled
Gradually turn down；
If the current exhaust degree of superheat is more than the target exhaust degree of superheat, the aperture of the heating restricting element is controlled
Gradually tune up.
3. in multi-line system according to claim 2 heat restricting element control method, which is characterized in that by with
Lower formula obtains the current exhaust degree of superheat of the compressor：
DSH=Tp-Tc,
Wherein, DSH is the current exhaust degree of superheat of the compressor, and Tp is the compressor after the compressor stable operation
Current exhaust gas temperature, Tc are the corresponding saturation temperature of current exhaust pressure of the compressor after the compressor stable operation.
4. a kind of multi-line system, which is characterized in that including：
Outdoor unit, the outdoor unit include compressor；
Multiple indoor units, heating indoor unit is correspondingly arranged heating restricting element in the multiple indoor unit, and the heating throttling is first
Part into the refrigerant of heating indoor unit to carrying out throttling control；And
Control module, the control module heating that any one heating indoor unit is sent out in receiving the multiple indoor unit
It can take, obtain the target exhaust pressure or the corresponding saturation temperature of the target exhaust pressure of the compressor, and obtain
Current outdoor environment temperature, the control module are corresponding full according to the target exhaust pressure or the target exhaust pressure
The compressor is controlled to obtain the current exhaust mistake of the compressor after the compressor stable operation with temperature
Temperature, and the target exhaust degree of superheat of the compressor is obtained according to the current outdoor environment temperature, and according to the mesh
The aperture of the heating restricting element is adjusted in mark discharge superheat and the current exhaust degree of superheat, wherein
The control module is obtained by the following formula the target exhaust degree of superheat of the compressor：
DSHm=A × (Pc-Pe)+B,
Wherein, DSHm is the target exhaust degree of superheat of the compressor, and A=C × T0+D, T0 are the current outdoor environment temperature
Degree, Pc are the current exhaust pressure of the compressor after the compressor stable operation, and Pe is after the compressor stable operation
The current back pressure of the compressor, A, B, C and D are design factor；Alternatively,
The control module is obtained by the following formula the target exhaust degree of superheat of the compressor：
DSHm=A × (Tc-Te)+B,
Wherein, DSHm is the target exhaust degree of superheat of the compressor, and A=C × T0+D, T0 are the current outdoor environment temperature
Degree, Tc are the corresponding saturation temperature of current exhaust pressure of the compressor after the compressor stable operation, and Te is the pressure
The corresponding saturation temperature of current back pressure of the compressor after contracting machine stable operation, A, B, C and D are design factor.
5. multi-line system according to claim 4, which is characterized in that the control module is according to the target exhaust
When the aperture of the heating restricting element is adjusted in the degree of superheat and the current exhaust degree of superheat, wherein
If the current exhaust degree of superheat is less than the target exhaust degree of superheat, control module if, controls the heating and saves
The aperture of fluid element is gradually turned down；
If the current exhaust degree of superheat is more than the target exhaust degree of superheat, control module if, controls the heating and saves
The aperture of fluid element gradually tunes up.
6. multi-line system according to claim 5, which is characterized in that the control module is obtained by the following formula institute
State the current exhaust degree of superheat of compressor：
DSH=Tp-Tc,
Wherein, DSH is the current exhaust degree of superheat of the compressor, and Tp is the compressor after the compressor stable operation
Current exhaust gas temperature, Tc are the corresponding saturation temperature of current exhaust pressure of the compressor after the compressor stable operation.
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| CN201610264509.6A CN105865074B (en) | 2016-04-25 | 2016-04-25 | Multi-line system and its control method for heating restricting element |
| PCT/CN2016/104720 WO2017185708A1 (en) | 2016-04-25 | 2016-11-04 | Multi-split air conditioning system and method for controlling heating and throttling element thereof |
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| CN105865074B (en) * | 2016-04-25 | 2018-09-07 | 广东美的暖通设备有限公司 | Multi-line system and its control method for heating restricting element |
| CN106545969A (en) * | 2016-11-22 | 2017-03-29 | 广东美的暖通设备有限公司 | Multiple on-line system and its outdoor restricting element control method |
| CN107120786B (en) * | 2017-04-12 | 2019-11-05 | 广东美的暖通设备有限公司 | The control method and device of interior machine restricting element in air conditioner and air conditioner |
| CN107860103B (en) * | 2017-10-27 | 2020-04-03 | 广东美的暖通设备有限公司 | Control method and device of multi-split system and system with control device |
| CN110671799B (en) * | 2019-10-12 | 2021-02-19 | 青岛海信日立空调系统有限公司 | Air conditioning system and refrigerant flow control method |
| CN113375319A (en) * | 2020-02-25 | 2021-09-10 | 青岛海尔空调电子有限公司 | Control method of fixed-frequency air conditioner in refrigeration state |
| CN111426030A (en) * | 2020-02-25 | 2020-07-17 | 青岛海尔空调电子有限公司 | Control method of fixed-frequency air conditioner in heating state |
| CN113218056B (en) * | 2021-05-21 | 2023-06-16 | 青岛海尔空调电子有限公司 | Electronic expansion valve opening control method and device and air conditioner |
| CN113639485B (en) * | 2021-07-23 | 2023-03-28 | 青岛海尔空调电子有限公司 | Method and device for adjusting exhaust superheat degree of heat pump equipment and heat pump equipment |
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