CN107559955B - Multi-line system and its low temperature control method - Google Patents
Multi-line system and its low temperature control method Download PDFInfo
- Publication number
- CN107559955B CN107559955B CN201710713481.4A CN201710713481A CN107559955B CN 107559955 B CN107559955 B CN 107559955B CN 201710713481 A CN201710713481 A CN 201710713481A CN 107559955 B CN107559955 B CN 107559955B
- Authority
- CN
- China
- Prior art keywords
- temperature
- aperture
- preset
- line system
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of multi-line system and its low temperature control methods, the described method comprises the following steps: obtaining the present mode of operation of multi-line system；If the present mode of operation of multi-line system is pure refrigeration mode, current outdoor environment temperature is obtained, and judge whether current outdoor environment temperature is less than or equal to the first preset temperature；If current outdoor environment temperature is less than or equal to the first preset temperature, the evaporating temperature of at least one indoor unit and preset target evaporating temperature in multiple indoor units are then obtained, and the aperture of orifice union is controlled according to the evaporating temperature of at least one indoor unit and preset target evaporating temperature.Low temperature control method of the invention, it can be in cryogenic refrigeration, by controlling the aperture that orifice union on the low-pressure air pipe of part flow arrangement is arranged in, it is unlikely to too low come the low pressure for the interior machine that makes to freeze, to effectively prevent interior machine anti-freeze of freezing, enable machine continuous cooling in refrigeration, guarantees refrigeration effect.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to the low temperature control method and one kind of a kind of multi-line system are multi-joint
Machine system.
Background technique
Usually computer room, kitchen etc. have continuous heat source space in, need air-conditioning system carry out cryogenic refrigeration, but
When air-conditioning system carries out cryogenic refrigeration, air cooling heat exchanger in outdoor unit will all come as condenser using may lead in this way
Reason condensation effect is very good and prevents the refrigerant in the evaporator of indoor from evaporating completely, and it is cold to return liquid so as to cause system
Matchmaker causes compressor to burn when serious.Simultaneously as the high pressure in outdoor unit is lower, so that low pressure is also lower therewith, if room
The low pressure of inside is too low, then can cause the evaporator anti-freeze of indoor, so that system can not continue to freeze, influences low temperature
Under refrigeration effect.
Summary of the invention
The present invention is directed to solve one of the technical problem in above-mentioned technology at least to a certain extent.
For this purpose, the first purpose of this invention is to propose a kind of low temperature control method of multi-line system, it can be low
When temperature refrigeration, by controlling the aperture that orifice union on the low-pressure air pipe of part flow arrangement is arranged in, come the interior machine that makes to freeze
Low pressure be unlikely to too low, to effectively prevent interior machine anti-freeze of freezing, enable machine continuous cooling in refrigeration, guarantee refrigeration
Effect.
Second object of the present invention is to propose a kind of computer readable storage medium.
Third object of the present invention is to propose a kind of multi-line system.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of low temperature controlling party of multi-line system
Method, the multi-line system include outdoor unit, part flow arrangement and multiple indoor units, are correspondingly arranged at the low pressure of the part flow arrangement
Orifice union, multiple outdoor heat exchangers and connected multiple outdoor units throttling corresponding with the multiple outdoor heat exchanger on tracheae
Element, the low temperature control method is the following steps are included: obtain the present mode of operation of the multi-line system；If described more
The present mode of operation of on-line system is pure refrigeration mode, then obtains current outdoor environment temperature, and judge the current outdoor
Whether environment temperature is less than or equal to the first preset temperature；If it is default that the current outdoor environment temperature is less than or equal to described first
Temperature then obtains the evaporating temperature of at least one indoor unit and preset target evaporating temperature in the multiple indoor unit, and root
According at least one indoor unit evaporating temperature and the preset target evaporating temperature to the aperture of the orifice union into
Row control.
The low temperature control method of multi-line system according to an embodiment of the present invention obtains the current operation mould of multi-line system
Formula obtains current outdoor environment temperature if the present mode of operation of multi-line system is pure refrigeration mode, and judges current
Whether outdoor environment temperature is less than or equal to the first preset temperature, if current outdoor environment temperature is less than or equal to the first default temperature
Degree, then obtain the evaporating temperature of at least one indoor unit and preset target evaporating temperature in multiple indoor units, and according at least
The evaporating temperature and preset target evaporating temperature of one indoor unit control the aperture of orifice union.This method as a result,
It can be in cryogenic refrigeration, by controlling the aperture that orifice union on the low-pressure air pipe of part flow arrangement is arranged in, to make
The low pressure of machine is unlikely to too low in freezing, to effectively prevent interior machine anti-freeze of freezing, enables machine continuous cooling in refrigeration,
Guarantee refrigeration effect.
In addition, the low temperature control method of the multi-line system proposed according to that above embodiment of the present invention can also have it is as follows
Additional technical characteristic:
According to one embodiment of present invention, if the current outdoor environment temperature is greater than first preset temperature,
The aperture for then controlling the orifice union is in preset maximum allowable aperture.
According to one embodiment of present invention, if the present mode of operation of the multi-line system be main refrigeration mode or
The main heating mode of person, then directly according to the evaporating temperature and the preset target evaporating temperature pair of at least one indoor unit
The aperture of the orifice union is controlled.
According to one embodiment of present invention, the evaporating temperature of at least one indoor unit according to and described default
Target evaporating temperature the aperture of the orifice union is controlled, comprising: if the evaporation of at least one indoor unit
Temperature is less than the preset target evaporating temperature, then carries out aperture to the orifice union and turn control down；If it is described at least
The evaporating temperature of one indoor unit is greater than the preset target evaporating temperature, then carries out aperture to the orifice union and tune up control
System.
According to one embodiment of present invention, when the present mode of operation of the multi-line system is the pure refrigeration mode
And the current outdoor environment temperature is when being less than or equal to first preset temperature, on the gas exhaust piping that also obtains the compressor
Pressure at expulsion, and according to the pressure at expulsion and the current outdoor environment temperature to the multiple outdoor unit restricting element
Aperture is controlled, wherein if the pressure at expulsion is small less than the first preset pressure or the current outdoor environment temperature
In the second preset temperature, then aperture is carried out to the multiple outdoor unit restricting element and turn control down；If the pressure at expulsion is big
In first preset pressure and the current outdoor environment temperature is greater than second preset temperature, then to the multiple outdoor
Machine restricting element carries out aperture and tunes up control.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of computer readable storage medium, has
It is stored in instruction therein, when executed, the outdoor unit executes above-mentioned low temperature control method.
The computer readable storage medium of the embodiment of the present invention, by the low temperature controlling party for executing above-mentioned multi-line system
Method, by controlling the aperture that orifice union on the low-pressure air pipe of part flow arrangement is arranged in, can be come in cryogenic refrigeration
The low pressure of interior machine of making to freeze is unlikely to too low, to effectively prevent interior machine anti-freeze of freezing, machine in refrigeration is continuously made
It is cold, guarantee refrigeration effect.
In order to achieve the above objectives, third aspect present invention embodiment proposes a kind of multi-line system, comprising: outdoor unit,
The outdoor unit includes multiple outdoor heat exchangers and connected multiple outdoor units throttling member corresponding with the multiple outdoor heat exchanger
Part；Part flow arrangement, the part flow arrangement include the orifice union being correspondingly arranged on the low-pressure air pipe of the part flow arrangement；It is multiple
Indoor unit；Control module, the control module are used to obtain the present mode of operation of the multi-line system, and described multi-joint
When the present mode of operation of machine system is pure refrigeration mode, current outdoor environment temperature is obtained, and judge the current outdoor ring
Whether border temperature is less than or equal to the first preset temperature, wherein if the current outdoor environment temperature is less than or equal to described first
Preset temperature then obtains the evaporating temperature of at least one indoor unit and preset target evaporating temperature in the multiple indoor unit,
And the orifice union is opened according to the evaporating temperature of at least one indoor unit and the preset target evaporating temperature
Degree is controlled.
Multi-line system according to an embodiment of the present invention obtains the current operation mould of multi-line system by control module
Formula, and when the present mode of operation of multi-line system is pure refrigeration mode, current outdoor environment temperature is obtained, and judge current
Whether outdoor environment temperature is less than or equal to the first preset temperature, wherein if current outdoor environment temperature is less than or equal to first in advance
If temperature, control module then obtains the evaporating temperature of at least one indoor unit and preset target evaporation temperature in multiple indoor units
Degree, and the aperture of orifice union is controlled according to the evaporating temperature of at least one indoor unit and preset target evaporating temperature
System.The system can be in cryogenic refrigeration, by the aperture that orifice union on the low-pressure air pipe of part flow arrangement is arranged in as a result,
It is controlled, is unlikely to too low come the low pressure for the interior machine that makes to freeze, so that interior machine anti-freeze of freezing is effectively prevent, so that machine in freezing
Can continuous cooling, guarantee refrigeration effect.
In addition, the multi-line system proposed according to that above embodiment of the present invention can also have following additional technology special
Sign:
According to one embodiment of present invention, if the current outdoor environment temperature is greater than first preset temperature,
The aperture that the control module then controls the orifice union is in preset maximum allowable aperture.
According to one embodiment of present invention, if the present mode of operation of the multi-line system be main refrigeration mode or
The main heating mode of person, the control module is then directly according to the evaporating temperature of at least one indoor unit and the preset mesh
Mark evaporating temperature controls the aperture of the orifice union.
According to one embodiment of present invention, the control module is in the evaporating temperature according at least one indoor unit
When controlling with the preset target evaporating temperature the aperture of the orifice union, wherein if it is described at least one
The evaporating temperature of indoor unit is less than the preset target evaporating temperature, and the control module then opens the orifice union
Degree turns control down；If the evaporating temperature of at least one indoor unit is greater than the preset target evaporating temperature, the control
Molding block then carries out aperture to the orifice union and tunes up control.
According to one embodiment of present invention, when the present mode of operation of the multi-line system is the pure refrigeration mode
And the current outdoor environment temperature be less than or equal to first preset temperature when, the control module also obtains the compressor
Gas exhaust piping on pressure at expulsion, and according to the pressure at expulsion and the current outdoor environment temperature to the multiple outdoor
The aperture of machine restricting element is controlled, wherein if the pressure at expulsion is less than the first preset pressure or described works as cup
Less than the second preset temperature, the control module then carries out aperture to the multiple outdoor unit restricting element and turns down external environment temperature
Control；If the pressure at expulsion is greater than first preset pressure and the current outdoor environment temperature is greater than described second in advance
If temperature, the control module then carries out aperture to the multiple outdoor unit restricting element and tunes up control.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of multi-line system according to an embodiment of the invention；
Fig. 2 is refrigerant flow graph when multi-line system according to an embodiment of the invention is in pure refrigeration mode；
When Fig. 3 is that multi-line system according to an embodiment of the invention is in main refrigeration mode or main heating mode
Refrigerant flow graph；
Fig. 4 is the flow chart of the low temperature control method of multi-line system according to an embodiment of the present invention；And
Fig. 5 is refrigerant flow graph when multi-line system in accordance with another embodiment of the present invention is in pure refrigeration mode.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The low temperature control method of the multi-line system proposed according to embodiments of the present invention and described more with reference to the accompanying drawing
On-line system.
In an embodiment of the present invention, multi-line system may include outdoor unit, part flow arrangement and multiple indoor units, and correspondence is set
It sets orifice union on the low-pressure air pipe of part flow arrangement, multiple outdoor heat exchangers and corresponding with multiple outdoor heat exchangers is connected
Multiple outdoor unit restricting elements.
Wherein, multi-line system may include two-pipe heat-reclamation multi-compressors system and three-tube type heat-reclamation multi-compressors system,
It is mainly described in detail by taking three-tube type heat-reclamation multi-compressors system as an example below.
As a specific example, as shown in Figure 1, three-tube type heat-reclamation multi-compressors system may include outdoor unit 10, it is multiple
Indoor unit 20 and part flow arrangement 30.
Wherein, outdoor unit 10 may include compressor 13, the first outdoor heat exchanger 11, the second outdoor heat exchanger 12, the first Room
Outer machine restricting element EXV1 and the second outdoor unit restricting element EXV2, the first four-way valve ST1, the second four-way valve ST2 and the three or four
Port valve ST3.Wherein, the exhaust outlet of compressor 13 is connected by the first four-way valve ST1 with one end of the first outdoor heat exchanger 11, the
The other end of one outdoor heat exchanger 11 is connected to high-pressure liquid tube by the first outdoor unit restricting element EXV1；The exhaust of compressor 13
Mouth is connected by the second four-way valve ST2 with one end of the second outdoor heat exchanger 12, and the other end of the second outdoor heat exchanger 12 passes through
Second outdoor unit restricting element EXV2 is connected to high-pressure liquid tube；The exhaust outlet of compressor 13 passes through third four-way valve ST3 and high pressure
Tracheae is connected with low-pressure air pipe.
Multiple indoor units 20 may include the first indoor unit and the second indoor unit, wherein the first indoor unit includes that the first interior is changed
Hot device 21 and the first indoor unit restricting element EV1, the second indoor unit include that the second indoor heat exchanger 22 and the second indoor unit throttle
Element EV2.
Part flow arrangement 30 may include refrigeration on-off valve SVA1 corresponding with the first indoor unit and heating on-off valve SVB1, with the
The corresponding refrigeration on-off valve SVA2 of two indoor units and heating on-off valve SVB2 and orifice union 31 (can by restricting element EXV0 and
On-off valve SV0 parallel connection is constituted).Wherein, one end of refrigeration on-off valve SVA1 is connected with low-pressure air pipe, and refrigeration on-off valve SVA1's is another
One end is connected with one end of the first indoor heat exchanger 21 of the first indoor unit, and the other end of the first indoor heat exchanger 21 passes through first
Indoor unit restricting element EV1 is connected with high-pressure liquid tube, and one end of heating on-off valve SVB1 is connected with high-pressure air pipe, heats on-off valve
The other end of SVB1 is connected with the other end of refrigeration on-off valve SVA1；One end of refrigeration on-off valve SVA2 is connected with low-pressure air pipe,
The other end of refrigeration on-off valve SVA2 is connected with one end of the second indoor heat exchanger 22 of the second indoor unit, the second indoor heat exchanger
22 other end is connected by the second indoor unit restricting element EV2 with high-pressure liquid tube, and one end and the high pressure of on-off valve SVB2 are heated
Tracheae is connected, and the other end for heating on-off valve SVB2 is connected with the other end of refrigeration on-off valve SVA2.The setting of orifice union 31 exists
On the low-pressure air pipe of part flow arrangement 30.
When three-tube type heat-reclamation multi-compressors system is run with pure refrigeration mode, as shown in Fig. 2, the first four-way valve ST1 and
Second four-way valve ST2 is powered on, third four-way valve ST3 power-off, the exhaust outlet of compressor 13 and the first outdoor heat exchange of outdoor unit 10
Device 11 is directly connected to the second outdoor heat exchanger 12.Wherein, the first outdoor heat exchanger 11 and the second conduct of outdoor heat exchanger 12
Condenser.At this point, being divided into two-way from the high pressure gaseous refrigerant that the exhaust outlet of compressor 13 is discharged: all the way by the first four-way
The first outdoor heat exchanger 11 is flowed to after valve ST1, becomes high temperature and pressure liquid refrigerant after condensing heat release, is throttled through the first outdoor unit first
Enter high-pressure liquid tube after part EXV1 throttling；Another way flows to the second outdoor heat exchanger 12 after the second four-way valve ST2, and condensation is put
Become high temperature and pressure liquid refrigerant after heat, enters high-pressure liquid tube after the second outdoor unit restricting element EXV2 throttling.Two-way refrigerant
After converging, continues on the high-pressure liquid tube connecting with part flow arrangement 30 and flowed to low pressure direction.High-pressure liquid tube passes through part flow arrangement
Refrigerant is distributed to the first indoor unit and the second indoor unit by 30, is entered after corresponding indoor unit restricting element EV1 and EV2 throttling
After corresponding first indoor heat exchanger and the second indoor heat exchanger evaporation endothermic, become medium temperature low-pressure gaseous refrigerant.First is indoor
The medium temperature low-pressure gaseous refrigerant of heat exchanger 21 and the second indoor heat exchanger 22 by with corresponding refrigeration on-off valve SVA1 and SVA2
It merges in the middle air pipe of part flow arrangement 30, then enters low-pressure air pipe after orifice union 31 carries out second throttle, most
Compressor 13 is back to by the muffler of overcompression machine 13.
When three-tube type heat-reclamation multi-compressors system is run with main heating mode or main refrigeration mode, as shown in figure 3, room
The outdoor heat exchanger of outer machine 10 can be with the adjusting of pressure, and a part is evaporator sometimes, and a part is condenser, for example, the
One outdoor heat exchanger 11 is evaporator, and the second outdoor heat exchanger 12 is condenser, is changed outside the exhaust outlet and second Room of compressor 13
Hot device 12 is directly connected to, and the gas returning port of compressor 13 is directly connected to the first outdoor heat exchanger 11.At this point, from the row of compressor 13
The high pressure gaseous refrigerant of port discharge is divided into two-way: flowing to the second outdoor heat exchanger after the second four-way valve ST2 all the way
12, become high temperature and pressure liquid refrigerant after condensing heat release, enters high-pressure liquid tube after the second outdoor unit restricting element EXV2 throttling；
Another way is after third four-way valve ST3 and heating on-off valve SVB1 corresponding with heating indoor unit, into heating indoor unit
Indoor heat exchanger becomes high temperature and pressure liquid refrigerant after indoor heat exchanger condenses heat release, is then throttled by indoor unit first
Enter high-pressure liquid tube after part reducing pressure by regulating flow.The refrigerant a part come out from high-pressure liquid tube flows directly into refrigeration indoor unit, passes through system
After the indoor unit restricting element reducing pressure by regulating flow of cold indoor unit, into the indoor heat exchanger of refrigeration indoor unit, steamed through indoor heat exchanger
After hair heat absorption, becomes middle pressure gaseous coolant, finally flow back to the gas returning port of compressor 13；Another part enters in outdoor unit 10
One outdoor heat exchanger 11 flows back to returning for compressor 13 by the first four-way valve ST1 after 11 evaporation endothermic of the first outdoor heat exchanger
Port.
Fig. 4 is the flow chart of the low temperature control method of multi-line system according to an embodiment of the present invention.As shown in figure 4, should
The low temperature control method of multi-line system can comprise the following steps that
S1 obtains the present mode of operation of multi-line system.
S2 obtains current outdoor environment temperature if the present mode of operation of multi-line system is pure refrigeration mode, and
Judge whether current outdoor environment temperature is less than or equal to the first preset temperature.
Specifically, current outdoor environment temperature T4 can be obtained by the way that the temperature sensor of outside is arranged in, and judges to work as
Relationship between preceding outdoor environment temperature T4 and the first preset temperature T1.Wherein, the first preset temperature T1 can be according to the actual situation
It is demarcated, for example, the first preset temperature T1 can be -5 DEG C.
S3 is obtained at least one in multiple indoor units if current outdoor environment temperature is less than or equal to the first preset temperature
The evaporating temperature of a indoor unit and preset target evaporating temperature, and according to the evaporating temperature of at least one indoor unit and preset
Target evaporating temperature controls the aperture of orifice union.Wherein, preset target evaporating temperature Tes can be according to the actual situation
It is demarcated.
According to one embodiment of present invention, if current outdoor environment temperature is greater than the first preset temperature, section is controlled
The aperture of stream component is in preset maximum allowable aperture.
According to one embodiment of present invention, temperature is evaporated according to the evaporating temperature of at least one indoor unit and preset target
Degree controls the aperture of orifice union, comprising: if the evaporating temperature of at least one indoor unit is steamed less than preset target
Temperature is sent out, then aperture is carried out to orifice union and turns control down；If the evaporating temperature of at least one indoor unit is greater than preset mesh
Evaporating temperature is marked, then aperture is carried out to orifice union and tunes up control.
Specifically, when system is run with pure refrigeration mode, if current outdoor environment temperature T4 is greater than the first default temperature
It spends T1 (e.g., -5 DEG C), then illustrates that current outdoor environment temperature is relatively high, system is not in that system returns liquid when being freezed
The protection of anti-freeze caused by state refrigerant and indoor low pressure are too low, so without the low-pressure air pipe by the way that part flow arrangement is arranged in
On orifice union to refrigerant carry out second throttle, can be protected by the aperture regulation of orifice union to maximum allowable aperture at this time
Hold maximum negotiability and the smallest pressure drop.
If current outdoor environment temperature T4 is less than or equal to the first preset temperature T1 (such as -5 DEG C), illustrate at current system
In cryogenic refrigeration state, the evaporation of indoor unit can be obtained by the way that the temperature sensor in the exit of heat exchanger indoors is arranged at this time
Temperature T2, and the aperture of orifice union is adjusted according to evaporating temperature T2 and preset target evaporating temperature Tes.Example
Such as, as T2 < Tes, illustrate that current back pressure is too low, the hypotony of indoor, so at this time can be by part flow arrangement
Low-pressure air pipe on the aperture of orifice union turned down, to carry out two to the refrigerant flowed back to from indoor by orifice union
Secondary throttling, so that indoor becomes middle pressure condition, so that the temperature of the indoor heat exchanger of refrigeration indoor unit is unlikely to
It is too low, it effectively prevent indoor heat exchanger anti-freeze to protect, allows system to continue to freeze, guarantee refrigeration effect.And if T2
> Tes can then tune up the aperture of orifice union, until evaporating temperature T2 is equal to preset target evaporating temperature Tes, or
The aperture of orifice union reaches maximum allowable aperture.
Further, as shown in Fig. 2, when orifice union includes restricting element (such as electric expansion valve) and on-off valve (such as electricity
Magnet valve) when, when the aperture to orifice union is adjusted, if necessary to by the aperture regulation of orifice union to 50%, then may be used
On-off valve to be closed, and by the aperture regulation of restricting element to 50%, wherein aperture when fully opening on-off valve is denoted as
100%, aperture when completely closing is denoted as 0%, and aperture when restricting element to be opened into preset maximum allowable aperture is denoted as
100%, aperture when restricting element is opened into preset minimum allowable aperture is denoted as 0%；If necessary to opening orifice union
Degree is adjusted to 100%, then can close on-off valve, and open by the aperture regulation of restricting element to 100%, or by on-off valve
It opens, and by the aperture regulation of restricting element to 0%；If necessary to by the aperture regulation of orifice union to 150%, then can lead to
Disconnected valve is opened, and by the aperture regulation of restricting element to 50%.
Therefore, the low temperature control method of multi-line system according to an embodiment of the present invention, in multi-line system cryogenic refrigeration
When, it is controlled by the aperture to the orifice union on the low-pressure air pipe that part flow arrangement is arranged in, to make the low of interior machine of freezing
Pressure is unlikely to too low, to effectively prevent interior machine anti-freeze of freezing, enables machine continuous cooling in refrigeration, guarantees refrigeration effect
Fruit.
Further, according to one embodiment of present invention, when the present mode of operation of multi-line system is pure refrigeration mould
Exhaust pressure when formula and current outdoor environment temperature are less than or equal to the first preset temperature, also on the gas exhaust piping of acquisition compressor
Power, and the aperture of multiple outdoor unit restricting elements is controlled according to pressure at expulsion and current outdoor environment temperature, wherein such as
Fruit pressure at expulsion less than the first preset pressure or current outdoor environment temperature less than the second preset temperature, then to multiple outdoor units
Restricting element carries out aperture and turns control down, if pressure at expulsion is greater than the first preset pressure and current outdoor environment temperature greater than the
Two preset temperatures then carry out aperture to multiple outdoor unit restricting elements and tune up control.Wherein, the first preset pressure and second is preset
Temperature can be demarcated according to the actual situation.
Specifically, as shown in Fig. 2, when system is run with pure refrigeration mode, and current outdoor environment temperature T4≤the first
When preset temperature T1, other than the aperture to orifice union is adjusted, also needed sometimes to the outdoor heat exchanger in outdoor unit
Exchange capability of heat be adjusted.For example, (or pressure at expulsion is corresponding by the pressure at expulsion P for obtaining on the gas exhaust piping of compressor in real time
Saturation temperature Tc), and according to pressure at expulsion P (or the corresponding saturation temperature Tc of pressure at expulsion) and current outdoor environment temperature T4
The aperture of first outdoor unit restricting element and the second outdoor unit restricting element is controlled.Wherein, as pressure at expulsion P < first
When preset pressure P1 or current outdoor environment temperature T4 < the second preset temperature T3, to the first outdoor unit restricting element and second
Outdoor unit restricting element carries out aperture and turns control down；When pressure at expulsion P > the first preset pressure P1 and current outdoor environment temperature
When T4 > the second preset temperature T3, aperture is carried out to the first outdoor unit restricting element and the second outdoor unit restricting element and tunes up control
System.
For example, as shown in figure 5, during system is run with pure refrigeration mode, if working as outdoor environment temperature
The part heat exchanger in outdoor unit can be then used only in very low (such as reaching -25 DEG C), for example, the first four-way valve is powered off, the
Two four-way valves power on, and to enable the second outdoor heat exchanger, and the aperture of the second outdoor unit restricting element are adjusted to compared with small guide vane, together
When by orifice union on-off valve close, the restricting element in orifice union is maintained at lesser aperture, with utmostly
Reduction return liquid refrigerants the problem of, while as far as possible improve indoor low pressure, prevent low pressure is too low from leading to interior
The protection of side anti-freeze, and then guarantee that indoor unit can normally freeze to the greatest extent, guarantee refrigeration effect.
Further, according to one embodiment of present invention, as shown in figure 3, if the current operation mould of multi-line system
Formula is main refrigeration mode or main heating mode, then is directly steamed according to the evaporating temperature of at least one indoor unit and preset target
Hair temperature controls the aperture of orifice union.
Specifically, when system is with mixed mode (including main refrigeration mode and main heating mode) operation, outdoor heat exchange
Device can be with the adjusting of pressure, and a part is evaporator sometimes, and a part is condenser, for example, the first outdoor heat exchanger is to steam
Device is sent out, the second outdoor heat exchanger is condenser.Since outdoor environment temperature is lower than room temperature, the steaming of the evaporator in outdoor unit
Hair temperature, which has to be lower than outdoor environment temperature, to be come to use and the indoor unit that freezes as normal evaporator from outdoor heat absorption
Evaporating temperature but cannot be low as the evaporating temperature of the evaporator in outdoor unit, it is anti-otherwise to will lead to refrigeration indoor unit frosting
Freeze, so the evaporating temperature of refrigeration indoor unit is higher than the evaporating temperature of the evaporator in outdoor unit.And in order to reach the mesh
, it can also be according to the evaporating temperature T2 and preset target evaporating temperature Tes of indoor unit to the low pressure that part flow arrangement is arranged in
The aperture of orifice union on tracheae is adjusted, to carry out two partial nodes to the refrigerant for being back to compressor from refrigeration indoor unit
Stream, so that the refrigerant of indoor becomes middle pressure condition, so that the evaporating temperature of refrigeration indoor unit is unlikely to too low, so that being
System can continuous cooling, guarantee refrigeration effect.Wherein, according to the evaporating temperature T2 of indoor unit and preset target evaporating temperature
It has been retouched before the detailed process that the aperture of the orifice union on the low-pressure air pipe that part flow arrangement is arranged in is adjusted in Tes
It states, just repeats no more here.
As a result, when multi-line system is run with main refrigeration mode or main heating mode, normally it can freeze and heat,
Guarantee that refrigeration indoor unit will not frequently enter anti-freeze state, so guarantee in cool room machine can continuous cooling, and do not influence
The heat recovery function and refrigeration of multi-line system and the effect of heating, while having widened the temperature range of mixed mode, Ke Yishi
Mixed mode under existing lower temperature.
In conclusion the low temperature control method of multi-line system according to an embodiment of the present invention, obtains multi-line system
Present mode of operation obtains current outdoor environment temperature if the present mode of operation of multi-line system is pure refrigeration mode,
And judge whether current outdoor environment temperature is less than or equal to the first preset temperature, if current outdoor environment temperature is less than or equal to the
One preset temperature then obtains the evaporating temperature of at least one indoor unit and preset target evaporating temperature in multiple indoor units, and
The aperture of orifice union is controlled according to the evaporating temperature of at least one indoor unit and preset target evaporating temperature.By
This, this method can be in cryogenic refrigeration, by carrying out to the aperture that orifice union on the low-pressure air pipe of part flow arrangement is arranged in
Control is unlikely to too low come the low pressure for the interior machine that makes to freeze, to effectively prevent interior machine anti-freeze of freezing, enables machine in refrigeration
Continuous cooling guarantees refrigeration effect.
In addition, the embodiment of the present invention also proposed a kind of computer readable storage medium, it is therein with being stored in
Instruction, when executed, outdoor unit executes the low temperature control method of above-mentioned multi-line system.
The computer readable storage medium of the embodiment of the present invention, by the low temperature controlling party for executing above-mentioned multi-line system
Method, by controlling the aperture that orifice union on the low-pressure air pipe of part flow arrangement is arranged in, can be come in cryogenic refrigeration
The low pressure of interior machine of making to freeze is unlikely to too low, to effectively prevent interior machine anti-freeze of freezing, machine in refrigeration is continuously made
It is cold, guarantee refrigeration effect.
The multi-line system of the embodiment of the present invention will be described below.
Fig. 1 is the structural schematic diagram of multi-line system according to an embodiment of the invention.As shown in Figure 1, the multi-connected machine
System may include outdoor unit 10, multiple indoor units 20, part flow arrangement 30 and control module (not specifically illustrated in figure).
Wherein, outdoor unit 10 may include multiple outdoor heat exchangers and connected multiple outdoors corresponding with multiple outdoor heat exchangers
Machine restricting element.Part flow arrangement 30 may include the orifice union 31 being correspondingly arranged on the low-pressure air pipe of part flow arrangement 30.Control
Module is used to obtain the present mode of operation of multi-line system, and is pure refrigeration mode in the present mode of operation of multi-line system
When, current outdoor environment temperature is obtained, and judge whether current outdoor environment temperature is less than or equal to the first preset temperature, wherein
If current outdoor environment temperature is less than or equal to the first preset temperature, the steaming of at least one indoor unit in multiple indoor units is obtained
Temperature and preset target evaporating temperature are sent out, and according to the evaporating temperature of at least one indoor unit and preset target evaporating temperature
The aperture of orifice union is controlled.
According to one embodiment of present invention, if current outdoor environment temperature is greater than the first preset temperature, control module
The aperture for then controlling orifice union 31 is in preset maximum allowable aperture.
According to one embodiment of present invention, if the present mode of operation of multi-line system is main refrigeration mode or master
Heating mode, control module is then directly according to the evaporating temperature of at least one indoor unit and preset target evaporating temperature to throttling
The aperture of component 31 is controlled.
According to one embodiment of present invention, control module is according to the evaporating temperature of at least one indoor unit and preset
When target evaporating temperature controls the aperture of orifice union 31, wherein if the evaporating temperature of at least one indoor unit is small
In preset target evaporating temperature, control module then carries out aperture to orifice union 31 and turns control down, if at least one is indoor
The evaporating temperature of machine is greater than preset target evaporating temperature, and control module then carries out aperture to orifice union 31 and tunes up control.
According to one embodiment of present invention, when the present mode of operation of multi-line system is pure refrigeration mode and works as cup
When external environment temperature is less than or equal to the first preset temperature, control module also obtains the exhaust pressure on the gas exhaust piping of compressor 13
Power, and the aperture of multiple outdoor unit restricting elements is controlled according to pressure at expulsion and current outdoor environment temperature, wherein such as
Fruit pressure at expulsion is less than the first preset pressure or current outdoor environment temperature less than the second preset temperature, and control module is then to more
A outdoor unit restricting element carries out aperture and turns control down, if pressure at expulsion is greater than the first preset pressure and current outdoor environment temperature
Degree is greater than the second preset temperature, and control module then carries out aperture to multiple outdoor unit restricting elements and tunes up control.
It should be noted that undisclosed details in the multi-line system of the embodiment of the present invention, please refers to implementation of the present invention
Details disclosed in the low temperature control method of the multi-line system of example, specific which is not described herein again.
Multi-line system according to an embodiment of the present invention obtains the current operation mould of multi-line system by control module
Formula, and when the present mode of operation of multi-line system is pure refrigeration mode, current outdoor environment temperature is obtained, and judge current
Whether outdoor environment temperature is less than or equal to the first preset temperature, wherein if current outdoor environment temperature is less than or equal to first in advance
If temperature, control module then obtains the evaporating temperature of at least one indoor unit and preset target evaporation temperature in multiple indoor units
Degree, and the aperture of orifice union is controlled according to the evaporating temperature of at least one indoor unit and preset target evaporating temperature
System.The system can be in cryogenic refrigeration, by the aperture that orifice union on the low-pressure air pipe of part flow arrangement is arranged in as a result,
It is controlled, is unlikely to too low come the low pressure for the interior machine that makes to freeze, so that interior machine anti-freeze of freezing is effectively prevent, so that machine in freezing
Can continuous cooling, guarantee refrigeration effect.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (9)
1. a kind of low temperature control method of multi-line system, which is characterized in that the multi-line system includes outdoor unit, shunts dress
Set with multiple indoor units, be correspondingly arranged at orifice union on the low-pressure air pipe of the part flow arrangement, multiple outdoor heat exchangers and
Connected multiple outdoor unit restricting elements corresponding with the multiple outdoor heat exchanger, the low temperature control method includes following step
It is rapid:
Obtain the present mode of operation of the multi-line system；
If the present mode of operation of the multi-line system is pure refrigeration mode, current outdoor environment temperature is obtained, and sentence
Whether the current outdoor environment temperature of breaking is less than or equal to the first preset temperature；
If the current outdoor environment temperature is less than or equal to first preset temperature, obtain in the multiple indoor unit extremely
The evaporating temperature and preset target evaporating temperature of a few indoor unit, and according to the evaporating temperature of at least one indoor unit
The aperture of the orifice union is controlled with the preset target evaporating temperature, wherein according at least one described room
The evaporating temperature of interior machine and the preset target evaporating temperature control the aperture of the orifice union, comprising:
If the evaporating temperature of at least one indoor unit is less than the preset target evaporating temperature, to the throttling group
Part carries out aperture and turns control down；
If the evaporating temperature of at least one indoor unit is greater than the preset target evaporating temperature, to the throttling group
Part carries out aperture and tunes up control.
2. the low temperature control method of multi-line system as described in claim 1, which is characterized in that if the current outdoor ring
Border temperature is greater than first preset temperature, then the aperture for controlling the orifice union is in preset maximum allowable aperture.
3. the low temperature control method of multi-line system as described in claim 1, which is characterized in that if the multi-line system
Present mode of operation be main refrigeration mode or main heating mode, then directly according to the evaporation temperature of at least one indoor unit
Degree and the preset target evaporating temperature control the aperture of the orifice union.
4. the low temperature control method of multi-line system as claimed in any one of claims 1-3, which is characterized in that when described more
The present mode of operation of on-line system is the pure refrigeration mode and the current outdoor environment temperature is less than or equal to described first
When preset temperature, pressure at expulsion also on the gas exhaust piping of acquisition compressor, and according to the pressure at expulsion and described work as cup
External environment temperature controls the aperture of the multiple outdoor unit restricting element, wherein
If the pressure at expulsion less than the first preset pressure or the current outdoor environment temperature less than the second preset temperature,
Aperture then is carried out to the multiple outdoor unit restricting element and turns control down；
If the pressure at expulsion is greater than first preset pressure and the current outdoor environment temperature is greater than described second in advance
If temperature, then aperture is carried out to the multiple outdoor unit restricting element and tune up control.
5. a kind of computer readable storage medium, which is characterized in that have and be stored in instruction therein, when described instruction is performed
When, the outdoor unit executes such as low temperature control method of any of claims 1-4.
6. a kind of multi-line system characterized by comprising
Outdoor unit, the outdoor unit include multiple outdoor heat exchangers and connected multiple rooms corresponding with the multiple outdoor heat exchanger
Outer machine restricting element；
Part flow arrangement, the part flow arrangement include the orifice union being correspondingly arranged on the low-pressure air pipe of the part flow arrangement；
Multiple indoor units；
Control module, the control module are used to obtain the present mode of operation of the multi-line system, and in the multi-connected machine
When the present mode of operation of system is pure refrigeration mode, current outdoor environment temperature is obtained, and judge the current outdoor environment
Whether temperature is less than or equal to the first preset temperature, wherein if the current outdoor environment temperature is less than or equal to described first in advance
If temperature, then the evaporating temperature of at least one indoor unit and preset target evaporating temperature in the multiple indoor unit are obtained, and
According to the evaporating temperature of at least one indoor unit and the preset target evaporating temperature to the aperture of the orifice union
It is controlled, wherein the control module is in the evaporating temperature and the preset target according at least one indoor unit
When evaporating temperature controls the aperture of the orifice union,
If the evaporating temperature of at least one indoor unit is less than the preset target evaporating temperature, if the control module
Aperture is carried out to the orifice union and turns control down；
If the evaporating temperature of at least one indoor unit is greater than the preset target evaporating temperature, if the control module
Aperture is carried out to the orifice union and tunes up control.
7. multi-line system as claimed in claim 6, which is characterized in that if the current outdoor environment temperature is greater than described
First preset temperature, the aperture that the control module then controls the orifice union are in preset maximum allowable aperture.
8. multi-line system as claimed in claim 6, which is characterized in that if the present mode of operation of the multi-line system
For main refrigeration mode or main heating mode, the control module is then directly according to the evaporating temperature of at least one indoor unit
The aperture of the orifice union is controlled with the preset target evaporating temperature.
9. the multi-line system as described in any one of claim 6-8, which is characterized in that current when the multi-line system
Operational mode is described for the pure refrigeration mode and when the current outdoor environment temperature is less than or equal to first preset temperature
Control module also obtains the pressure at expulsion on the gas exhaust piping of compressor, and according to the pressure at expulsion and the current outdoor ring
Border temperature controls the aperture of the multiple outdoor unit restricting element, wherein
If the pressure at expulsion less than the first preset pressure or the current outdoor environment temperature less than the second preset temperature,
The control module then carries out aperture to the multiple outdoor unit restricting element and turns control down；
If the pressure at expulsion is greater than first preset pressure and the current outdoor environment temperature is greater than described second in advance
If temperature, the control module then carries out aperture to the multiple outdoor unit restricting element and tunes up control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710713481.4A CN107559955B (en) | 2017-08-18 | 2017-08-18 | Multi-line system and its low temperature control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710713481.4A CN107559955B (en) | 2017-08-18 | 2017-08-18 | Multi-line system and its low temperature control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107559955A CN107559955A (en) | 2018-01-09 |
| CN107559955B true CN107559955B (en) | 2019-11-29 |
Family
ID=60976169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710713481.4A Active CN107559955B (en) | 2017-08-18 | 2017-08-18 | Multi-line system and its low temperature control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107559955B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731187B (en) * | 2018-06-20 | 2020-05-08 | 广东美的暖通设备有限公司 | Three-pipe heat recovery multi-split air conditioner system and control method thereof |
| CN110017592A (en) * | 2019-03-11 | 2019-07-16 | 广东美的暖通设备有限公司 | Multi-connected machine control method, device and equipment |
| CN110030705A (en) * | 2019-04-01 | 2019-07-19 | 广东美的暖通设备有限公司 | The control method of multi-line system |
| CN111442507B (en) * | 2020-04-07 | 2022-07-19 | 广东美的暖通设备有限公司 | Air conditioner and control method and device thereof |
| CN111473500B (en) * | 2020-04-29 | 2021-11-02 | 广东美的暖通设备有限公司 | Air conditioner and control method and device thereof |
| CN113865067B (en) * | 2021-10-27 | 2022-12-20 | 美的集团武汉暖通设备有限公司 | Multi-split air conditioner, control method thereof and computer readable storage medium |
| CN114353277B (en) * | 2021-11-30 | 2023-04-21 | 珠海格力电器股份有限公司 | Anti-frosting control method and anti-frosting air conditioner |
| CN114413418B (en) * | 2022-01-26 | 2023-06-09 | 宁波奥克斯电气股份有限公司 | Automatic restoration method, storage medium and system for multi-split freezing |
| CN115875794A (en) * | 2022-11-30 | 2023-03-31 | 南京天加环境科技有限公司 | Throttle valve opening control method and device and medium |
-
2017
- 2017-08-18 CN CN201710713481.4A patent/CN107559955B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107559955A (en) | 2018-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107559955B (en) | Multi-line system and its low temperature control method | |
| EP3734167B1 (en) | Air conditioner system | |
| CN104832989B (en) | The control method of air conditioner and air conditioner | |
| CN108105912B (en) | Multi-line system and its anti-refrigerant bias current control method, control device | |
| CN105928059B (en) | Multi-line system and its control method for heating restricting element | |
| CN106524557B (en) | Anti- return hydraulic control method when multi-line system and its defrosting | |
| US9377225B2 (en) | Outdoor heat exchanger and air conditioner comprising the same | |
| CN106871345B (en) | Do not shut down defrosting system and air conditioner | |
| KR100869971B1 (en) | Freeze, refrigeration and warm water accumulation system using heatpump | |
| CN106288488B (en) | The control method of air-conditioner system and air-conditioner system | |
| CN108731187A (en) | Three pipe heat-reclamation multi-compressors systems and its control method | |
| WO2019134509A1 (en) | Outdoor unit, air conditioning system, and control method | |
| CN111121353A (en) | Air conditioner capable of improving heat exchange performance and control method thereof | |
| CN106016457B (en) | Multi-line system and its control method for heating restricting element | |
| CN104329824A (en) | Multi-connected type air conditioner system and control method thereof | |
| CN107238226B (en) | Multi-split system and control method thereof | |
| CN106288564A (en) | Air conditioning system | |
| CN105222436A (en) | The control method of air-conditioning system and air-conditioning system | |
| CN104197570B (en) | The heating method of a kind of Three-pipe heat recovery multi-connected machine system and system | |
| CN107490090A (en) | Air conditioner | |
| CN106322814A (en) | Air conditioning system and air conditioner | |
| CN205619615U (en) | Multi -split air conditioning system | |
| CN107238161A (en) | Multiple on-line system and its mode switch control method | |
| CN107559953A (en) | Multiple on-line system and its control method and device that loop valve body is subcooled | |
| CN208620489U (en) | Air-conditioner system and air conditioner with it |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |