CN108007027A - The halt control method and device of refrigeration system - Google Patents
The halt control method and device of refrigeration system Download PDFInfo
- Publication number
- CN108007027A CN108007027A CN201711085335.8A CN201711085335A CN108007027A CN 108007027 A CN108007027 A CN 108007027A CN 201711085335 A CN201711085335 A CN 201711085335A CN 108007027 A CN108007027 A CN 108007027A
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- Prior art keywords
- frequency
- compressor
- evacuation
- refrigeration system
- evacuate
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- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
Abstract
The invention discloses the halt control method and device of a kind of refrigeration system, wherein, method includes：When refrigeration system reaches halt condition, the compressor of refrigeration system is adjusted to evacuate frequency operation, wherein, evacuate the running frequency that frequency is compressor in pre-set evacuation process；In the case where compressor is to evacuate frequency operation, judge whether the low pressure of refrigeration system is less than or equal to preset pressure；When judging that low pressure is less than or equal to preset pressure, compressor shutdown is controlled.The present invention evacuates operation by the way that compressor preferentially to be adjusted to evacuation frequency before shutdown is evacuated; can effectively avoid the problem that low pressure is relatively low, pressure ratio is bigger than normal causes to shorten compressor service life; unit operation time partially long problem after shutting down also is avoided at the same time, lifts user experience.
Description
Technical field
The present invention relates to refrigeration system control technology field, and in particular to the halt control method and dress of a kind of refrigeration system
Put.
Background technology
For refrigeration system, such as air-cooled, water chiller or low-temperature heat pump air conditioner device are larger in internal-external temperature difference to avoid
When for a long time place after refrigerant migration cause start when band liquid the problem of, it will usually shut down when carry out evacuate shut down control, this
Sample can effectively ensure to start solution dehumidification while migration generation caused by placement process refrigerant migration.
Such as the Chinese patent application of publication number CN105241144A, it discloses a kind of closing method of low temperature unit, it is
System, low temperature unit and refrigeration system, specifically disclose and carry out evacuating circulation by low voltage control and shielding low-voltage protects realization to stop
Machine controls；The Chinese patent of publication number CN103727629A discloses a kind of air-cooled condensing group startup side for adapting to low temperature environment
Method and device, specifically disclose the evacuation protection for passing through triggering shielding control mainboard so that evacuate shielding failure and complete compression
Machine is started shooting.
However, inventor has found in the course of the research, during control is shut down, the frequency of compressor is excessive or too low
When create a great impression to low pressure value, wherein：
When compressor is in high frequency：It is adjusted, is located according to target evaporating temperature in refrigeration system temperature-fall period unit
In high-frequency operating status (such as highest possible 120Hz of variable frequency condenser group), if operational process shuts down manually, even if shielding is taken out
Empty low-voltage variation, actually can, rotating speed too fast evacuation process low pressure drop low rate excessive due to frequency it is too fast (evacuated time 10S with
Inside then it is likely to be breached minimal pressure force value), and then cause actual low pressure very low.If condensation side temperature (or water temperature) compares at this time
Height, then occur that the high high pressure ratio of comparison (is such as reached according to high pressure during R404a refrigerant unit peak load operating modes when shutting down
2.1MPa, low pressure reaches 0.09MPa, pressure ratio=3.9/0.09=23.3 during evacuation；Pressure ratio is by higher when if refrigerant is R410A).
In refrigeration system switching on and shutting down, if the service life of compressor can be shortened by frequently occurring high pressure ratio；
When compressor is in low frequency：As refrigeration system maintains room temperature (or storehouse temperature), system meeting low frequency operation (such as frequency conversion
Condense the minimum possible 20Hz operations of unit).If operational process shuts down manually, stop compressor consumption to evacuation end since evacuation
When about need it is 2-3 minutes or so time-consuming partially long.
The content of the invention
The invention solves under compressor high frequency state in the prior art shut down when low pressure it is relatively low shorten the compressor service life, with
And the technical problem that evacuated time is grown when being shut down under low frequency state, so as to provide the control method and device of a kind of heat pump unit.
The one side of the embodiment of the present invention, there is provided a kind of halt control method of refrigeration system, including：In the refrigeration
When system reaches halt condition, the compressor of the refrigeration system is adjusted to evacuate frequency operation, wherein, the evacuation frequency is
The running frequency of compressor described in pre-set evacuation process；In the compressor with the situation of the evacuation frequency operation
Under, judge whether the low pressure of the refrigeration system is less than or equal to preset pressure；When judge the low pressure be less than etc.
When the preset pressure, the compressor shutdown is controlled.
Alternatively, adjust the compressor of the refrigeration system is included with evacuating frequency operation：Detect working as the compressor
Preceding running frequency；Compare the current operation frequency and the size of the evacuation frequency, obtain comparative result；According to comparative result
The running frequency of the compressor is adjusted to the evacuation frequency.
Alternatively, running frequency to the evacuation frequency of the compressor is adjusted according to comparative result to be included：When described
When current operation frequency is more than the evacuation frequency, the compressor is controlled to be downconverted to described evacuate frequently with default frequency reducing speed
Rate.
Alternatively, running frequency to the evacuation frequency of the compressor is adjusted according to comparative result to be included：When described
When current operation frequency is less than or equal to the evacuation frequency, the compressor is controlled with default raising frequency speed raising frequency to the evacuation
Frequency.
Alternatively, after the compressor shutdown is controlled, further include：The refrigeration system is controlled after delay preset time
Other loads of system are stopped.
Alternatively, after the compressor for adjusting the refrigeration system is to evacuate frequency operation, further include：Close feed flow electricity
Magnet valve.
The another aspect of the embodiment of the present invention, there is provided a kind of stop control apparatus of refrigeration system, including：Adjust single
Member, for when the refrigeration system reaches halt condition, adjusting the compressor of the refrigeration system to evacuate frequency operation, its
In, it is described to evacuate running frequency of the frequency for compressor described in pre-set evacuation process；Judging unit, for described
In the case that compressor is with the evacuation frequency operation, judge whether the low pressure of the refrigeration system is less than or equal to default pressure
Power；Control unit, for when judging that the low pressure is less than or equal to the preset pressure, controlling the compressor to stop
Machine.
Alternatively, the adjustment unit includes：Detection module, for detecting the current operation frequency of the compressor；Than
Compared with module, for the current operation frequency and the size of the evacuation frequency, comparative result is obtained；Adjustment module, is used
In the running frequency according to the comparative result adjusting compressor to the evacuation frequency.
Alternatively, the adjustment module includes：First control submodule, described in being more than when the current operation frequency
When evacuating frequency, the compressor is controlled to be downconverted to the evacuation frequency with default frequency reducing speed.
Alternatively, the adjustment module includes：Second control submodule, for being less than or equal to when the current operation frequency
During the evacuation frequency, the compressor is controlled with default raising frequency speed raising frequency to the evacuation frequency.
Alternatively, described control unit is additionally operable to after the compressor shutdown is controlled, and is controlled after delay preset time
Other loads for making the refrigeration system are stopped.
Alternatively, described control unit is additionally operable to run it in the compressor for adjusting the refrigeration system to evacuate frequency
Afterwards, liquid supply electromagnetic valve is closed.
According to embodiments of the present invention, frequency evacuation operation is evacuated by preferentially adjusting compressor before shutdown is evacuated,
Can effectively avoid the problem that low pressure is relatively low, pressure ratio is bigger than normal causes to shorten compressor service life, while also avoids machine after shutdown
The group partially long problem of run time, lifts user experience.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in describing below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
Put, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is a kind of structure diagram of refrigeration system；
Fig. 2 is the flow chart of the halt control method of refrigeration system in the embodiment of the present invention；
Fig. 3 is the flow chart of the halt control method of another refrigeration system in the embodiment of the present invention；
Fig. 4 is the schematic diagram of the stop control apparatus of refrigeration system in the embodiment of the present invention.
Embodiment
Technical scheme is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's all other embodiments obtained without making creative work, belong to the scope of protection of the invention.
In the description of the present invention, it is necessary to which explanation, term " first ", " second ", " the 3rd " are only used for description purpose,
And it is not intended that instruction or hint relative importance.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can be combined with each other into conflict.
Before the embodiment of the present invention is introduced, first it is introduced to evacuating shutdown principle.
A kind of structure diagram of refrigeration system as described in Figure 1, it includes interior machine and outer machine, wherein, outer machine includes：It is cold
Condenser 11, fluid reservoir 12, axial flow blower 13, exhaust temperature sensing package 14, filter 15, high pressure sensor 16, low pressure sensor 17, pressure
Contracting machine 19, air-breathing temperature sensing package 20, capillary 21, solenoid valve 22, filter 23, solenoid valve 25, electric expansion valve 26, minor valve 27
With big valve 24；Interior machine includes defrost temperature sensing package 28, leaving air temp temperature sensing package 29, axis stream maple leaf 30, evaporator 31, return air temperature
Temperature sensing package 32.Wherein, outer machine have high pressure sensor 16, low pressure sensor 17 can detecting system high low pressure pressure, electricity during shutdown
Magnet valve 22,25 is closed in advance before compressor 19 is shut down, compressor 19 continue to run with process when low pressure sensor inspection 17 measure it is low
Then compressor 19 shuts down when pressure pressure is less than certain value, realizes that evacuate shutdown (is extracted into condensation by the refrigerant in evaporator 31
The grade of device 11 Installed System Memory stores up, and due to the presence of check valve, evaporation would not also be flowed back to by placing the refrigerant of condensation side for a long time
Side), it is on the low side so as to fulfill refrigerant in evaporator 31, when would not also be again started up the problem of band liquid.
An embodiment of the present invention provides a kind of halt control method of refrigeration system, available for air-cooled, water chiller (frequency conversion
Freezing/refrigerating) or low-temperature heat pump air conditioner device etc..
As shown in Fig. 2, the halt control method includes：
Step S201, when refrigeration system reaches halt condition, adjusts the compressor of refrigeration system to evacuate frequency operation,
Wherein, the running frequency that frequency is compressor in pre-set evacuation process is evacuated.The evacuation frequency of the embodiment of the present invention can
To set different values according to the difference of refrigeration system, its value can be obtained according to statistics or test data.It is preferred that take out
Optimized operation frequency in null process.After control compressor is to evacuate frequency operation, liquid supply electromagnetic valve can also be controlled to close
Close, hence into evacuation process.Halt condition can be the temperature spot that manual shutdown command or temperature reach shutdown, make at this time
Cold group is not shut down also, only reaches halt condition.
Step S202, in the case where compressor is to evacuate frequency operation, judges whether the low pressure of refrigeration system is small
In equal to preset pressure.
Step S203, when judging that low pressure is less than or equal to preset pressure, controls compressor shutdown.
Low pressure can be detected to obtain by low pressure sensor.It is real in the case where compressor is run with above-mentioned evacuation frequency
When detect low pressure, when low pressure is less than or equal to preset pressure, represent evacuation be basically completed, control compressor shutdown.
According to embodiments of the present invention, frequency evacuation operation is evacuated by preferentially adjusting compressor before shutdown is evacuated,
Can effectively avoid the problem that low pressure is relatively low, pressure ratio is bigger than normal causes to shorten compressor service life, while also avoids machine after shutdown
The group partially long problem of run time, lifts user experience.
As an alternative embodiment, above-mentioned steps S201 in the embodiment of the present invention, adjusts the compression of refrigeration system
Machine is included with evacuating frequency operation：Detect the current operation frequency of compressor；Compare current operation frequency with evacuating the big of frequency
It is small, obtain comparative result；The running frequency of compressor is adjusted to evacuating frequency according to comparative result.
In the embodiment of the present invention, tune can be determined with evacuating the size of frequency by comparing compressor current operation frequency
The mode of section, so that the running frequency of compressor is finally maintained the evacuation frequency.Wherein it is possible to it is in definite refrigeration system
After meeting halt condition, restart the running frequency of detection compressor by one section of delay.
Specifically, the running frequency of compressor is adjusted according to comparative result to be included to frequency is evacuated：Work as current operation frequency
During more than evacuating frequency, control compressor is downconverted to evacuation frequency with default frequency reducing speed.
When compressor current operation frequency is more than and evacuates frequency, with pre-set default frequency reducing speed to compressor
Running frequency carries out frequency reducing control, so as to finally be down to above-mentioned evacuation frequency.
On the other hand, when current operation frequency is less than or equal to evacuate frequency, control compressor is with default raising frequency speed liter
Frequency extremely evacuates frequency.It that is to say when compressor current operation frequency is less than or equal to the evacuation frequency, with pre-set raising frequency
The running frequency of speed control compressor carries out raising frequency, so as to reach above-mentioned evacuation frequency.
Alternatively, in the embodiment of the present invention, after compressor shutdown is controlled, which further includes：Delay
Other loads of refrigeration system are controlled to be stopped after preset time.After compressor shutdown, after one section of delay again
The other loads (including wind turbine or water pump etc.) of control are shut down, and complete the stopping process of final refrigeration system.
Below by taking Fig. 3 as an example, a kind of optional embodiment of the embodiment of the present invention is described in detail.As shown in figure 3,
The halt control method of the present embodiment includes：
Step S301, determines that refrigeration system meets halt condition.
Step S302, be delayed T1, detects the current operation frequency f1 of compressor.
Step S303, judges whether current operation frequency f1 is less than or equal to evacuate frequency fTake out.Wherein, when more than evacuation frequency
fTake outWhen, perform step S304；Conversely, then perform step S305.
Step S304, carries out frequency reducing, until the running frequency f1=detected with speed V1 to the running frequency of compressor
fTake outWhen, perform step S306.
Step S305, carries out raising frequency, until the running frequency f1=detected with speed V2 to the running frequency of compressor
fTake outWhen, perform step S306.
Step S306, closes liquid supply electromagnetic valve.
Step S307, judges whether low pressure P1 is less than or equal to PTake out.If it is, performing step S308, pumping that is to say
Null process is completed；Judge conversely, then continuing detection.
Step S308, controls compressor shutdown.
Step S309, be delayed T2, controls other loads to shut down.
According to embodiments of the present invention, can be effective by realizing that variable frequency adjustment most preferably evacuates frequency to system before evacuating shutdown
The low pressure relatively low influence to compressor service life when avoiding the high frequency state from shutting down, and while being shut down under low-frequency operation state, evacuate
Time partially long the problems such as not meeting use habit.
The embodiment of the present invention additionally provides a kind of stop control apparatus of refrigeration system, which can be used for
Perform the stop control apparatus of the embodiment of the present invention.As shown in figure 4, the stop control apparatus includes：Adjustment unit 401, judge
Unit 402 and control unit 403.
Adjustment unit 401 is used for when refrigeration system reaches halt condition, adjusts the compressor of refrigeration system to evacuate frequency
Rate is run, wherein, evacuate the running frequency that frequency is compressor in pre-set evacuation process.
The evacuation frequency of the embodiment of the present invention can set different values according to the difference of refrigeration system, its value can basis
Statistics or test data obtain.It is preferred that the optimized operation frequency in evacuation process.Compressor is being controlled to evacuate frequency
After operation, liquid supply electromagnetic valve can also be controlled to close with control unit 403, hence into evacuation process.Halt condition
Can be the temperature spot that manual shutdown command or temperature reach shutdown, refrigeration unit is not shut down also at this time, only reaches shutdown bar
Part.
Judging unit 402 is used for the low pressure in the case where compressor is to evacuate frequency operation, judging refrigeration system
Whether preset pressure is less than or equal to.
Control unit 403 is used for when judging that low pressure is less than or equal to preset pressure, controls compressor shutdown.
Low pressure can be detected to obtain by low pressure sensor.It is real in the case where compressor is run with above-mentioned evacuation frequency
When detect low pressure, when low pressure is less than or equal to preset pressure, represent evacuation be basically completed, control compressor shutdown.
According to embodiments of the present invention, frequency evacuation operation is evacuated by preferentially adjusting compressor before shutdown is evacuated,
Can effectively avoid the problem that low pressure is relatively low, pressure ratio is bigger than normal causes to shorten compressor service life, while also avoids machine after shutdown
The group partially long problem of run time, lifts user experience.
As an alternative embodiment, adjustment unit includes：Detection module, for detecting the current operation of compressor
Frequency；Comparison module, for the size for comparing current operation frequency with evacuating frequency, obtains comparative result；Adjustment module, is used for
The running frequency of compressor is adjusted to evacuating frequency according to comparative result.
In the embodiment of the present invention, tune can be determined with evacuating the size of frequency by comparing compressor current operation frequency
The mode of section, so that the running frequency of compressor is finally maintained the evacuation frequency.Wherein it is possible to it is in definite refrigeration system
After meeting halt condition, restart the running frequency of detection compressor by one section of delay.
Specifically, adjustment module includes：First control submodule, for when current operation frequency be more than evacuate frequency when,
Control compressor is downconverted to evacuation frequency with default frequency reducing speed.
When compressor current operation frequency is more than and evacuates frequency, with pre-set default frequency reducing speed to compressor
Running frequency carries out frequency reducing control, so as to finally be down to above-mentioned evacuation frequency.
On the other hand, adjustment module includes：Second control submodule, for being less than or equal to evacuate frequency when current operation frequency
During rate, control compressor is with default raising frequency speed raising frequency to evacuating frequency.
It that is to say when compressor current operation frequency is less than or equal to the evacuation frequency, with pre-set raising frequency speed control
The running frequency of compressor processed carries out raising frequency, so as to reach above-mentioned evacuation frequency.
Alternatively, in the embodiment of the present invention, control unit is additionally operable to after compressor shutdown is controlled, and be delayed preset time
Other loads of refrigeration system are controlled to be stopped afterwards.After compressor shutdown, other are controlled again after one section of delay
Load (including wind turbine or water pump etc.) shut down, complete the stopping process of final refrigeration system.
Obviously, the above embodiments are merely examples for clarifying the description, and the restriction not to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the application.
Claims (12)
- A kind of 1. halt control method of refrigeration system, it is characterised in that including：When the refrigeration system reaches halt condition, the compressor of the refrigeration system is adjusted to evacuate frequency operation, wherein, It is described to evacuate running frequency of the frequency for compressor described in pre-set evacuation process；In the case where the compressor is with the evacuation frequency operation, judge whether the low pressure of the refrigeration system is less than Equal to preset pressure；When judging that the low pressure is less than or equal to the preset pressure, the compressor shutdown is controlled.
- 2. halt control method according to claim 1, it is characterised in that adjust the compressor of the refrigeration system to take out The operation of null tone rate includes：Detect the current operation frequency of the compressor；Compare the current operation frequency and the size of the evacuation frequency, obtain comparative result；According to the running frequency of the comparative result adjusting compressor to the evacuation frequency.
- 3. halt control method according to claim 2, it is characterised in that the compressor is adjusted according to comparative result Running frequency to the evacuation frequency includes：When the current operation frequency is more than the evacuation frequency, the compressor is controlled to be downconverted to institute with default frequency reducing speed State evacuation frequency.
- 4. halt control method according to claim 2, it is characterised in that the compressor is adjusted according to comparative result Running frequency to the evacuation frequency includes：When the current operation frequency is less than or equal to the evacuation frequency, the compressor is controlled to preset raising frequency speed raising frequency To the evacuation frequency.
- 5. halt control method according to claim 1, it is characterised in that after the compressor shutdown is controlled, also Including：Other loads of the refrigeration system are controlled to be stopped after delay preset time.
- 6. halt control method according to claim 1, it is characterised in that the compressor for adjusting the refrigeration system with After evacuating frequency operation, further include：Close liquid supply electromagnetic valve.
- A kind of 7. stop control apparatus of refrigeration system, it is characterised in that including：Adjustment unit, for when the refrigeration system reaches halt condition, adjusting the compressor of the refrigeration system to evacuate Frequency is run, wherein, it is described to evacuate running frequency of the frequency for compressor described in pre-set evacuation process；Judging unit, in the case of in the compressor with the evacuation frequency operation, judges the low of the refrigeration system Whether pressure pressure is less than or equal to preset pressure；Control unit, for when judging that the low pressure is less than or equal to the preset pressure, controlling the compressor to stop Machine.
- 8. stop control apparatus according to claim 7, it is characterised in that the adjustment unit includes：Detection module, for detecting the current operation frequency of the compressor；Comparison module, for the current operation frequency and the size of the evacuation frequency, obtains comparative result；Adjustment module, for the running frequency according to the comparative result adjusting compressor to the evacuation frequency.
- 9. stop control apparatus according to claim 8, it is characterised in that the adjustment module includes：First control submodule, for when the current operation frequency be more than it is described evacuation frequency when, control the compressor with Default frequency reducing speed is downconverted to the evacuation frequency.
- 10. stop control apparatus according to claim 8, it is characterised in that the adjustment module includes：Second control submodule, for when the current operation frequency is less than or equal to the evacuation frequency, controlling the compression Machine is with default raising frequency speed raising frequency to the evacuation frequency.
- 11. stop control apparatus according to claim 7, it is characterised in that described control unit is additionally operable in control institute After stating compressor shutdown, other loads of the refrigeration system are controlled to be stopped after delay preset time.
- 12. stop control apparatus according to claim 7, it is characterised in that described control unit is additionally operable to adjusting institute After the compressor of refrigeration system is stated to evacuate frequency operation, liquid supply electromagnetic valve is closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711085335.8A CN108007027A (en) | 2017-11-07 | 2017-11-07 | The halt control method and device of refrigeration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711085335.8A CN108007027A (en) | 2017-11-07 | 2017-11-07 | The halt control method and device of refrigeration system |
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| CN113375356A (en) * | 2021-05-28 | 2021-09-10 | 青岛海尔空调电子有限公司 | Control method of multi-split refrigerating and freezing unit and multi-split refrigerating and freezing unit |
| CN116242069A (en) * | 2023-02-22 | 2023-06-09 | 哲弗智能系统（上海）有限公司 | Control method and device of water cooler system and water cooler system |
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