CN107559955A - Multiple on-line system and its low temperature control method - Google Patents
Multiple on-line system and its low temperature control method Download PDFInfo
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- CN107559955A CN107559955A CN201710713481.4A CN201710713481A CN107559955A CN 107559955 A CN107559955 A CN 107559955A CN 201710713481 A CN201710713481 A CN 201710713481A CN 107559955 A CN107559955 A CN 107559955A
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Abstract
The invention discloses a kind of multiple on-line system and its low temperature control method, the described method comprises the following steps：Obtain the present mode of operation of multiple on-line system；If the present mode of operation of multiple on-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 set and default target evaporating temperature in multiple indoor sets are then obtained, and the aperture of orifice union is controlled according to the evaporating temperature and default target evaporating temperature of at least one indoor set.The low temperature control method of the present invention, can be in cryogenic refrigeration, by being controlled to the aperture for being arranged on orifice union on the low pressure gas pipe of part flow arrangement, to make the low pressure of machine in refrigeration be unlikely to too low, so as to effectively prevent interior machine anti-freeze of freezing, enable refrigeration in machine continuous cooling, ensure refrigeration.
Description
Technical field
The present invention relates to air-conditioning technical field, the low temperature control method and one kind of more particularly to a kind of multiple on-line system are multi-joint
Machine system.
Background technology
Generally computer room, kitchen etc. have continuous heat source space in, it is necessary to air-conditioning system carry out cryogenic refrigeration, but
When air-conditioning system carries out cryogenic refrigeration, air cooling heat exchanger in outdoor unit will be used all as condenser, may so be led
Reason condensation effect is very good and prevents the refrigerant in the evaporator of indoor from evaporating completely, cold so as to cause system to return liquid
Matchmaker, compressor is caused to burn when serious.Simultaneously as the high pressure in outdoor unit is relatively low so that low pressure also step-down therewith, if room
The low pressure of inner side is too low, then can cause the evaporator anti-freeze of indoor, and then causes system can not continue to freeze, and influences low temperature
Under refrigeration.
The content of the invention
It is contemplated that at least solves one of technical problem in above-mentioned technology to a certain extent.
Therefore, first purpose of the present invention is to propose a kind of low temperature control method of multiple on-line system, can be low
During temperature refrigeration, by being controlled to the aperture for being arranged on orifice union on the low pressure gas pipe of part flow arrangement, to make machine in refrigeration
Low pressure be unlikely to too low, so as to effectively preventing interior machine anti-freeze of freezing so that in refrigeration machine can continuous cooling, ensure refrigeration
Effect.
Second object of the present invention is to propose a kind of computer-readable recording medium.
Third object of the present invention is to propose a kind of multiple on-line system.
To reach above-mentioned purpose, first aspect present invention embodiment proposes a kind of low temperature controlling party of multiple on-line system
Method, the multiple on-line system include outdoor unit, part flow arrangement and multiple indoor sets, 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 comprise the following steps：Obtain the present mode of operation of the multiple on-line system；It is 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 obtain the evaporating temperature of at least one indoor set and default target evaporating temperature in the multiple indoor set, and root
The aperture of the orifice union is entered according to the evaporating temperature and the default target evaporating temperature of at least one indoor set
Row control.
The low temperature control method of multiple on-line system according to embodiments of the present invention, obtain the current operation mould of multiple on-line system
Formula, if the present mode of operation of multiple on-line system is pure refrigeration mode, current outdoor environment temperature is obtained, and judged 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 set and default target evaporating temperature in multiple indoor sets, and according at least
The evaporating temperature and default target evaporating temperature of one indoor set are controlled to the aperture of orifice union.Thus, this method
Can be in cryogenic refrigeration, by being controlled to the aperture for being arranged on orifice union on the low pressure gas pipe of part flow arrangement, to make
The low pressure of machine is unlikely to too low in refrigeration, so as to effectively preventing interior machine anti-freeze of freezing so that in refrigeration machine can continuous cooling,
Ensure refrigeration.
In addition, can also be had according to the low temperature control method of the multiple on-line system of the above embodiment of the present invention proposition as follows
Additional technical characteristic：
According to one embodiment of present invention, if the current outdoor environment temperature is more than first preset temperature,
The aperture of the orifice union is then controlled to be in default maximum allowable aperture.
According to one embodiment of present invention, if the present mode of operation of the multiple on-line system be main refrigeration mode or
The main heating mode of person, then directly according to the evaporating temperature of at least one indoor set and the default target evaporating temperature pair
The aperture of the orifice union is controlled.
According to one embodiment of present invention, the evaporating temperature according at least one indoor set and described default
Target evaporating temperature the aperture of the orifice union is controlled, including：If the evaporation of at least one indoor set
Temperature is less than the default target evaporating temperature, then carrying out aperture to the orifice union turns control down；If it is described at least
The evaporating temperature of one indoor set is more than the default target evaporating temperature, then carrying out aperture to the orifice union tunes up control
System.
According to one embodiment of present invention, when the present mode of operation of the multiple on-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 less than the first preset pressure or the current outdoor environment temperature is small
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
It is more than second preset temperature in first preset pressure and the current outdoor environment temperature, then to the multiple outdoor
Machine restricting element carries out aperture and tunes up control.
To reach above-mentioned purpose, second aspect of the present invention embodiment proposes a kind of computer-readable recording medium, had
Instruction therein is stored in, when executed, the outdoor unit performs above-mentioned low temperature control method.
The computer-readable recording medium of the embodiment of the present invention, by the low temperature controlling party for performing above-mentioned multiple on-line system
Method, it can come in cryogenic refrigeration, by being controlled to the aperture for being arranged on orifice union on the low pressure gas pipe of part flow arrangement
The low pressure of machine in refrigeration is set to be unlikely to too low, so as to effectively prevent interior machine anti-freeze of freezing so that machine can continuously be made in refrigeration
It is cold, ensure refrigeration.
To reach above-mentioned purpose, third aspect present invention embodiment proposes a kind of multiple on-line system, including：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 gas pipe of the distinguished and admirable device；It is multiple
Indoor set；Control module, the control module are used for the present mode of operation for obtaining the multiple on-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 the evaporating temperature of at least one indoor set and default target evaporating temperature in the multiple indoor set are obtained,
And the orifice union is opened according to the evaporating temperature and the default target evaporating temperature of at least one indoor set
Degree is controlled.
Multiple on-line system according to embodiments of the present invention, the current operation mould of multiple on-line system is obtained by control module
Formula, and when the present mode of operation of multiple on-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 pre- less than or equal to first
If temperature, control module then obtains the evaporating temperature of at least one indoor set and default target evaporation temperature in multiple indoor sets
Degree, and the aperture of orifice union is controlled according to the evaporating temperature and default target evaporating temperature of at least one indoor set
System.Thus, the system can pass through the aperture to being arranged on orifice union on the low pressure gas pipe of part flow arrangement in cryogenic refrigeration
It is controlled, to make the low pressure of machine in refrigeration be unlikely to too low, so as to effectively prevent interior machine anti-freeze of freezing so that machine in refrigeration
Can continuous cooling, ensure refrigeration.
In addition, the multiple on-line system proposed according to the above embodiment of the present invention can also have technology additional as follows special
Sign：
According to one embodiment of present invention, if the current outdoor environment temperature is more than first preset temperature,
The control module then controls the aperture of the orifice union to be in default maximum allowable aperture.
According to one embodiment of present invention, if the present mode of operation of the multiple on-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 set and the default mesh
Mark evaporating temperature is controlled to 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 set
When being controlled with the default target evaporating temperature to the aperture of the orifice union, wherein, if described at least one
The evaporating temperature of indoor set is less than the default target evaporating temperature, and the control module is then opened the orifice union
Degree turns control down；If the evaporating temperature of at least one indoor set is more than the default 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 multiple on-line system is the pure refrigeration mode
And the current outdoor environment temperature, when being less than or equal to first preset temperature, 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
External environment temperature is less than the second preset temperature, and the control module then carries out aperture to the multiple outdoor unit restricting element and turned down
Control；If the pressure at expulsion is more than first preset pressure and the current outdoor environment temperature is pre- more than described second
If temperature, the control module then carries out aperture to the multiple outdoor unit restricting element and tunes up control.
Brief description of the drawings
Fig. 1 is the structural representation of multiple on-line system according to an embodiment of the invention；
Fig. 2 is refrigerant flow graph when multiple on-line system according to an embodiment of the invention is in pure refrigeration mode；
When Fig. 3 is that multiple on-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 multiple on-line system according to embodiments of the present invention；And
Fig. 5 is refrigerant flow graph when multiple on-line system in accordance with another embodiment of the present invention is in pure refrigeration mode.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.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.
The low temperature control method of multiple on-line system that its is proposed according to embodiments of the present invention and described more below in conjunction with the accompanying drawings
On-line system.
In an embodiment of the present invention, multiple on-line system may include outdoor unit, part flow arrangement and multiple indoor sets, corresponding to set
Put orifice union on the low pressure gas pipe of part flow arrangement, multiple outdoor heat exchangers and corresponding with multiple outdoor heat exchangers be connected
Multiple outdoor unit restricting elements.
Wherein, multiple on-line system may include two-pipe heat-reclamation multi-compressors system and three-tube type heat-reclamation multi-compressors system,
Mainly it is described in detail below by taking three-tube type heat-reclamation multi-compressors system as an example.
As a specific example, as shown in figure 1, three-tube type heat-reclamation multi-compressors system may include outdoor unit 10, multiple
Indoor set 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 the 3rd four-way valve ST3 and high pressure
Tracheae is connected with low pressure gas pipe.
Multiple indoor sets 20 may include the first indoor set and the second indoor set, wherein the first indoor set changes including the first interior
The hot indoor set restricting element EV1 of device 21 and first, the second indoor set includes the second indoor heat exchanger 22 and the second indoor set throttles
Element EV2.
Part flow arrangement 30 may include refrigeration on-off valve SVA1 corresponding with the first indoor set and heating on-off valve SVB1, with the
Refrigeration on-off valve SVA2 corresponding to two indoor sets and heating on-off valve SVB2 and orifice union 31 (can by restricting element EXV0 and
On-off valve SV0 is in parallel to be formed).Wherein, refrigeration on-off valve SVA1 one end is connected with low pressure gas 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 set, and the other end of the first indoor heat exchanger 21 passes through first
Indoor set restricting element EV1 is connected with high-pressure liquid tube, and heating on-off valve SVB1 one end is connected with high-pressure air pipe, heats on-off valve
The SVB1 other end is connected with the other end for the on-off valve SVA1 that freezes；Refrigeration on-off valve SVA2 one end is connected with low pressure gas pipe,
The refrigeration on-off valve SVA2 other end is connected with one end of the second indoor heat exchanger 22 of the second indoor set, the second indoor heat exchanger
22 other end is connected by the second indoor set restricting element EV2 with high-pressure liquid tube, heating on-off valve SVB2 one end and high pressure
Tracheae is connected, and the heating on-off valve SVB2 other end is connected with the other end for the on-off valve SVA2 that freezes.Orifice union 31 is arranged on
On the low pressure gas 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
Electric on second four-way valve ST2, the 3rd four-way valve ST3 is powered off, the exhaust outlet of compressor 13 and the first outdoor heat exchange of outdoor unit 10
Device 11 directly connects with the second outdoor heat exchanger 12.Wherein, the first outdoor heat exchanger 11 and the second conduct of outdoor heat exchanger 12
Condenser.Now, the high pressure gaseous refrigerant discharged from the exhaust outlet of compressor 13 is divided into two-way：Pass through the first four-way all the way
The first outdoor heat exchanger 11 is flowed to after valve ST1, becomes HTHP liquid refrigerant after condensing heat release, is throttled through the first outdoor unit first
Enter high-pressure liquid tube after part EXV1 throttlings；Another way flows to the second outdoor heat exchanger 12 after the second four-way valve ST2, and condensation is put
Become HTHP liquid refrigerant after heat, enter high-pressure liquid tube after the second outdoor unit restricting element EXV2 throttlings.Two-way refrigerant
After converging, continue on and flowed with the high-pressure liquid tube that part flow arrangement 30 is connected to low pressure direction.High-pressure liquid tube passes through part flow arrangement
Refrigerant is distributed to the first indoor set and the second indoor set by 30, is entered after corresponding indoor set restricting element EV1 and EV2 throttling
After corresponding first indoor heat exchanger and the second indoor heat exchanger evaporation endothermic, turn into medium temperature low-pressure gaseous refrigerant.First is indoor
The medium temperature low-pressure gaseous refrigerant of the indoor heat exchanger 22 of heat exchanger 21 and second by with corresponding refrigeration on-off valve SVA1 and SVA2
Merge in the middle air pipe of part flow arrangement 30, then enter low pressure gas 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 regulation 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, and the exhaust outlet of compressor 13 outside second Room with changing
Hot device 12 directly connects, and the gas returning port of compressor 13 directly connects with the first outdoor heat exchanger 11.Now, from the row of compressor 13
The high pressure gaseous refrigerant of gas port discharge is divided into two-way：All the way the second outdoor heat exchanger is flowed to after the second four-way valve ST2
12, become HTHP liquid refrigerant after condensing heat release, enter high-pressure liquid tube after the second outdoor unit restricting element EXV2 throttlings；
Another way is after the 3rd four-way valve ST3 and heating on-off valve SVB1 corresponding with heating indoor set, into heating indoor set
Indoor heat exchanger, turn into HTHP liquid refrigerant after indoor heat exchanger condenses heat release, it is then first through being throttled by indoor set
Enter high-pressure liquid tube after part reducing pressure by regulating flow.The refrigerant part come out from high-pressure liquid tube flows directly into refrigeration indoor set, passes through system
After the indoor set restricting element reducing pressure by regulating flow of cold indoor set, into the indoor heat exchanger of refrigeration indoor set, steamed through indoor heat exchanger
After hair heat absorption, turn into middle pressure gaseous coolant, finally flow back to the gas returning port of compressor 13；Another part enter in outdoor unit 10 the
One outdoor heat exchanger 11, after the evaporation endothermic of the first outdoor heat exchanger 11, returning for compressor 13 is flowed back to by the first four-way valve ST1
Gas port.
Fig. 4 is the flow chart of the low temperature control method of multiple on-line system according to embodiments of the present invention.As shown in figure 4, should
The low temperature control method of multiple on-line system may include following steps：
S1, obtain the present mode of operation of multiple on-line system.
S2, if the present mode of operation of multiple on-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.
Specifically, current outdoor environment temperature T4 can be obtained by being disposed in the outdoor the temperature sensor of side, and judges to work as
Relation between preceding outdoor environment temperature T4 and the first preset temperature T1.Wherein, the first preset temperature T1 can be according to actual conditions
Demarcated, for example, the first preset temperature T1 can be -5 DEG C.
S3, if current outdoor environment temperature is less than or equal to the first preset temperature, obtain at least one in multiple indoor sets
The evaporating temperature of individual indoor set and default target evaporating temperature, and according to the evaporating temperature of at least one indoor set and default
Target evaporating temperature is controlled to the aperture of orifice union.Wherein, default target evaporating temperature Tes can be according to actual conditions
Demarcated.
According to one embodiment of present invention, if current outdoor environment temperature is more than the first preset temperature, control section
The aperture of stream component is in default maximum allowable aperture.
According to one embodiment of present invention, temperature is evaporated according to the evaporating temperature of at least one indoor set and default target
Spend and the aperture of orifice union is controlled, including：If the evaporating temperature of at least one indoor set is steamed less than default target
Temperature is sent out, then carrying out aperture to orifice union turns control down；If the evaporating temperature of at least one indoor set is more than default mesh
Evaporating temperature is marked, then carrying out aperture to orifice union tunes up control.
Specifically, when system is run with pure refrigeration mode, if current outdoor environment temperature T4 is more than the first default temperature
T1 (e.g., -5 DEG C) is spent, then illustrates that current outdoor environment temperature is higher, system is not in that system returns liquid when being freezed
Anti-freeze protection caused by state refrigerant and indoor low pressure are too low, so without the low pressure gas pipe by being arranged on part flow arrangement
On orifice union to refrigerant carry out second throttle, now can be protected by the aperture regulation of orifice union to maximum allowable aperture
Hold the negotiability of maximum and minimum 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 set can be now obtained by the temperature sensor in the exit for being disposed in the interior heat exchanger
Temperature T2, and the aperture of orifice union is adjusted according to evaporating temperature T2 and default target evaporating temperature Tes.Example
Such as, as T2 ＜ Tes, illustrate that current back pressure is too low, the hypotony of indoor, so now can be by part flow arrangement
Low pressure gas pipe on the aperture of orifice union turned down, two are carried out to the refrigerant flowed back to from indoor to pass through orifice union
Secondary throttling, so that indoor is changed into middle pressure condition, and then the temperature of the indoor heat exchanger of refrigeration indoor set is unlikely to
It is too low, effectively prevent indoor heat exchanger anti-freeze from protecting so that system can continue to freeze, and ensure refrigeration.And if T2
＞ Tes, then the aperture of orifice union can be tuned up, until evaporating temperature T2 is equal to default 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 desired by the aperture regulation of orifice union to 50%, then may be used
So that on-off valve to be closed, and by the aperture regulation of restricting element to 50%, wherein, aperture when on-off valve is fully opened is designated as
100%, aperture when completely closing is designated as 0%, and aperture when restricting element to be opened into default maximum allowable aperture is designated as
100%, aperture when restricting element is opened into default minimum allowable aperture is designated as 0%；If necessary to opening orifice union
Degree regulation can then close on-off valve, and the aperture regulation of restricting element is opened to 100%, or by on-off valve to 100%
Open, and by the aperture regulation of restricting element to 0%；If desired by the aperture regulation of orifice union to 150%, then will can lead to
Disconnected valve is opened, and by the aperture regulation of restricting element to 50%.
Therefore, the low temperature control method of multiple on-line system according to embodiments of the present invention, in multiple on-line system cryogenic refrigeration
When, it is controlled by the aperture of the orifice union to being arranged on the low pressure gas pipe of part flow arrangement, to make the low of machine in refrigeration
Pressure is unlikely to too low, so as to effectively preventing interior machine anti-freeze of freezing so that in refrigeration machine can continuous cooling, ensure refrigeration effect
Fruit.
Further, according to one embodiment of present invention, when the present mode of operation of multiple on-line system is pure refrigeration mould
Formula and when current outdoor environment temperature is less than or equal to the first preset temperature, also obtains the exhaust pressure on the gas exhaust piping of 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 is less than the first preset pressure or current outdoor environment temperature is 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 more than the first preset pressure and current outdoor environment temperature more than the
Two preset temperatures, then aperture is carried out 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 actual conditions.
Specifically, as shown in Fig. 2 when system is run with pure refrigeration mode, and current outdoor environment temperature T4≤the first
During preset temperature T1, in addition to the aperture of orifice union is adjusted, also need to 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 in real time on the gas exhaust piping of compressor
Saturation temperature Tc), and according to pressure at expulsion P (or saturation temperature Tc corresponding to 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
During 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
During 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, system with pure refrigeration mode run during, if working as outdoor environment temperature
Very low (such as reaching -25 DEG C), then the part heat exchanger in outdoor unit can be used only, for example, the first four-way valve is powered off, the
It is electric on two four-way valves, to enable the second outdoor heat exchanger, and the aperture of the second outdoor unit restricting element is 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 less aperture, with utmost
Reduction return liquid refrigerants the problem of, while as far as possible improve indoor low pressure, prevent low pressure is too low from causing interior
Side anti-freeze protection, and then farthest ensure that indoor set can normally freeze, and ensure refrigeration.
Further, according to one embodiment of present invention, if as shown in figure 3, the current operation mould of multiple on-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 set and default target
Hair temperature is controlled to the aperture of orifice union.
Specifically, when system is run with mixed mode (including main refrigeration mode and main heating mode), outdoor heat exchange
Device can be with the regulation of pressure, and a part is evaporator sometimes, and a part is condenser, for example, the first outdoor heat exchanger is steaming
Device is sent out, the second outdoor heat exchanger is condenser.Because outdoor environment temperature is lower than indoor temperature, the steaming of the evaporator in outdoor unit
Hair temperature have to be lower than outdoor environment temperature and could be used from outdoor heat absorption as normal evaporator, and the indoor set that freezes
Evaporating temperature but can not be low as the evaporating temperature of the evaporator in outdoor unit, otherwise will cause freeze indoor set frosting prevent
Freeze, so the evaporating temperature of refrigeration indoor set is higher than the evaporating temperature of the evaporator in outdoor unit.And in order to reach the mesh
, can also be according to the evaporating temperature T2 and default target evaporating temperature Tes of indoor set to being arranged on the low pressure of part flow arrangement
The aperture of orifice union on tracheae is adjusted, to carry out two partial nodes to the refrigerant that compressor is back to from refrigeration indoor set
Stream so that the refrigerant of indoor is changed into middle pressure condition, and then causes the evaporating temperature of refrigeration indoor set to be unlikely to too low so that is
System can continuous cooling, ensure refrigeration.Wherein, according to the evaporating temperature T2 of indoor set and default target evaporating temperature
Retouched before the detailed process that the aperture of orifice unions of the Tes to being arranged on the low pressure gas pipe of part flow arrangement is adjusted
State, just repeat no more here.
Thus, when multiple on-line system is run with main refrigeration mode or main heating mode, normally it can freeze and heat,
Ensure that refrigeration indoor set will not frequently enter anti-freeze state, so ensure in cool room machine can continuous cooling, and do not influence
The heat recovery function and refrigeration of multiple on-line system and the effect of heating, while widened the temperature range of mixed mode, Ke Yishi
Mixed mode under existing lower temperature.
In summary, the low temperature control method of multiple on-line system according to embodiments of the present invention, obtains multiple on-line system
Present mode of operation, if the present mode of operation of multiple on-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
One preset temperature, then the evaporating temperature of at least one indoor set and default target evaporating temperature in multiple indoor sets are obtained, and
The aperture of orifice union is controlled according to the evaporating temperature of at least one indoor set and default target evaporating temperature.By
This, this method can be in cryogenic refrigeration, by being carried out to the aperture for being arranged on orifice union on the low pressure gas pipe of part flow arrangement
Control, to make the low pressure of machine in refrigeration be unlikely to too low, so as to effectively prevent interior machine anti-freeze of freezing so that machine can in refrigeration
Continuous cooling, ensure refrigeration.
In addition, embodiments of the invention also proposed a kind of computer-readable recording medium, it is therein with being stored in
Instruction, when executed, outdoor unit perform the low temperature control method of above-mentioned multiple on-line system.
The computer-readable recording medium of the embodiment of the present invention, by the low temperature controlling party for performing above-mentioned multiple on-line system
Method, it can come in cryogenic refrigeration, by being controlled to the aperture for being arranged on orifice union on the low pressure gas pipe of part flow arrangement
The low pressure of machine in refrigeration is set to be unlikely to too low, so as to effectively prevent interior machine anti-freeze of freezing so that machine can continuously be made in refrigeration
It is cold, ensure refrigeration.
The multiple on-line system of the embodiment of the present invention will be described below.
Fig. 1 is the structural representation of multiple on-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 sets 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 gas pipe of distinguished and admirable device 30.Control
Module is used for the present mode of operation for obtaining multiple on-line system, and is pure refrigeration mode in the present mode of operation of multiple on-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 set in multiple indoor sets is obtained
Send out temperature and default target evaporating temperature, and the evaporating temperature according at least one indoor set and default target evaporating temperature
The aperture of orifice union is controlled.
According to one embodiment of present invention, if current outdoor environment temperature is more than the first preset temperature, control module
Then the aperture of orifice union 31 is controlled to be in default maximum allowable aperture.
According to one embodiment of present invention, if the present mode of operation of multiple on-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 set and default target evaporating temperature to throttling
The aperture of component 31 is controlled.
According to one embodiment of present invention, control module is in the evaporating temperature according at least one indoor set and default
When target evaporating temperature is controlled to the aperture of orifice union 31, wherein, if the evaporating temperature of at least one indoor set is small
In default target evaporating temperature, control module then carries out aperture to orifice union 31 and turns control down, if at least one interior
The evaporating temperature of machine is more than default 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 multiple on-line system for 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 is less than the second preset temperature, and control module is then to more
Individual outdoor unit restricting element carries out aperture and turns control down, if pressure at expulsion is more than the first preset pressure and current outdoor environment temperature
Degree is more 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 the details not disclosed in the multiple on-line system of the embodiment of the present invention, refer to implementation of the present invention
Details disclosed in the low temperature control method of the multiple on-line system of example, is specifically repeated no more here.
Multiple on-line system according to embodiments of the present invention, the current operation mould of multiple on-line system is obtained by control module
Formula, and when the present mode of operation of multiple on-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 pre- less than or equal to first
If temperature, control module then obtains the evaporating temperature of at least one indoor set and default target evaporation temperature in multiple indoor sets
Degree, and the aperture of orifice union is controlled according to the evaporating temperature and default target evaporating temperature of at least one indoor set
System.Thus, the system can pass through the aperture to being arranged on orifice union on the low pressure gas pipe of part flow arrangement in cryogenic refrigeration
It is controlled, to make the low pressure of machine in refrigeration be unlikely to too low, so as to effectively prevent interior machine anti-freeze of freezing so that machine in refrigeration
Can continuous cooling, ensure refrigeration.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the invention, " multiple " are meant that two or more,
Unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements.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 otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
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 are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is 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 the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (11)
1. a kind of low temperature control method of multiple on-line system, it is characterised in that the multiple on-line system includes outdoor unit, shunting dress
Put with multiple indoor sets, be correspondingly arranged at orifice union on the low pressure gas 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 include following step
Suddenly：
Obtain the present mode of operation of the multiple on-line system；
If the present mode of operation of the multiple on-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 set extremely
The evaporating temperature and default target evaporating temperature of a few indoor set, and according to the evaporating temperature of at least one indoor set
The aperture of the orifice union is controlled with the default target evaporating temperature.
2. the low temperature control method of multiple on-line system as claimed in claim 1, it is characterised in that if the current outdoor ring
Border temperature is more than first preset temperature, then controls the aperture of the orifice union to be in default maximum allowable aperture.
3. the low temperature control method of multiple on-line system as claimed in claim 1, it is characterised in that if the multiple on-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 set
Degree and the default target evaporating temperature are controlled to the aperture of the orifice union.
4. the low temperature control method of the multiple on-line system as any one of claim 1-3, it is characterised in that the basis
The evaporating temperature of at least one indoor set and the default target evaporating temperature are carried out to the aperture of the orifice union
Control, including：
If the evaporating temperature of at least one indoor set is less than the default target evaporating temperature, to the throttling group
Part carries out aperture and turns control down；
If the evaporating temperature of at least one indoor set is more than the default target evaporating temperature, to the throttling group
Part carries out aperture and tunes up control.
5. the low temperature control method of multiple on-line system as claimed in claim 4, it is characterised in that when the multiple on-line system
When present mode of operation is that the pure refrigeration mode and the current outdoor environment temperature are less than or equal to first preset temperature,
The pressure at expulsion on the gas exhaust piping of the compressor is also obtained, and according to the pressure at expulsion and the current outdoor environment temperature
Spend and the aperture of the multiple outdoor unit restricting element is controlled, wherein,
If the pressure at expulsion is less than the first preset pressure or the current outdoor environment temperature is 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 more than first preset pressure and the current outdoor environment temperature is pre- more than described second
If temperature, then aperture is carried out to the multiple outdoor unit restricting element and tune up control.
6. a kind of computer-readable recording medium, it is characterised in that have and be stored in instruction therein, when the instruction is performed
When, the outdoor unit performs the low temperature control method as any one of claim 1-5.
A kind of 7. multiple on-line system, it is characterised in that including：
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 gas pipe of the distinguished and admirable device；
Multiple indoor sets；
Control module, the control module are used for the present mode of operation for obtaining the multiple on-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 pre- less than or equal to described first
If temperature, then the evaporating temperature of at least one indoor set and default target evaporating temperature in the multiple indoor set are obtained, and
Aperture according to the evaporating temperature of at least one indoor set and the default target evaporating temperature to the orifice union
It is controlled.
8. multiple on-line system as claimed in claim 7, it is characterised in that if the current outdoor environment temperature is more than described
First preset temperature, the control module then control the aperture of the orifice union to be in default maximum allowable aperture.
9. multiple on-line system as claimed in claim 7, it is characterised in that if the present mode of operation of the multiple on-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 set
The aperture of the orifice union is controlled with the default target evaporating temperature.
10. the multiple on-line system as described in claim 7-9, it is characterised in that the control module is at least one according to
When the evaporating temperature of individual indoor set and the default target evaporating temperature are controlled to the aperture of the orifice union, its
In,
If the evaporating temperature of at least one indoor set is less than the default target evaporating temperature, the control module is then
Aperture is carried out to the orifice union and turns control down；
If the evaporating temperature of at least one indoor set is more than the default target evaporating temperature, the control module is then
Aperture is carried out to the orifice union and tunes up control.
11. multiple on-line system as claimed in claim 10, it is characterised in that when the present mode of operation of the multiple on-line system
When being less than or equal to first preset temperature for the pure refrigeration mode and the current outdoor environment temperature, the control module
The pressure at expulsion on the gas exhaust piping of the compressor is also obtained, and according to the pressure at expulsion and the current outdoor environment temperature
Spend and the aperture of the multiple outdoor unit restricting element is controlled, wherein,
If the pressure at expulsion is less than the first preset pressure or the current outdoor environment temperature is 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 more than first preset pressure and the current outdoor environment temperature is pre- more than described second
If temperature, the control module then carries out aperture to the multiple outdoor unit restricting element and tunes up control.
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|---|---|---|---|
| CN201710713481.4A CN107559955B (en) | 2017-08-18 | 2017-08-18 | Multi-line system and its low temperature control method |
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| CN108731187A (en) * | 2018-06-20 | 2018-11-02 | 广东美的暖通设备有限公司 | Three pipe heat-reclamation multi-compressors systems and its control method |
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| CN114353277A (en) * | 2021-11-30 | 2022-04-15 | 珠海格力电器股份有限公司 | Anti-frosting control method and anti-frosting air conditioner |
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