CN104729171B - Cold-hot water unit anti-freezing protection device and method - Google Patents
Cold-hot water unit anti-freezing protection device and method Download PDFInfo
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- CN104729171B CN104729171B CN201510139921.0A CN201510139921A CN104729171B CN 104729171 B CN104729171 B CN 104729171B CN 201510139921 A CN201510139921 A CN 201510139921A CN 104729171 B CN104729171 B CN 104729171B
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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
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to the field of cold/hot water units, in particular to a cold-hot water unit anti-freezing protection device and method. The cold-hot water unit anti-freezing protection device comprises a temperature sensor for detecting the temperature of the environment to be detected, an alarm device, a controller and a self contained power pack for supplying power to the temperature sensor, the alarm device and the controller. The controller can receive the environment temperature transmitted by the temperature sensor and control the alarm device to give out an alarm. The anti-freezing protection device can be powered on to conduct anti-freezing detection and judgment after a cold/hot water unit is powered off and remind a user timely to prevent the cold/hot water unit from being frozen off, and the problems that basic anti-freezing protection control is invalid due to the fact that the cold/hot water unit is powered off while a user forgets to discharge water are solved, so that a water system of the cold/hot water unit freezes, and pipes are frozen and damaged are solved.
Description
Technical field
The present invention relates to water chiller-heater unit field is and in particular to a kind of water chiller-heater unit anti-freeze protection device and water chiller/heater
Group anti-frost protection method.
Background technology
Water chiller-heater unit is the air-conditioner set providing the user hot and cold water, and it utilizes regenerative resource in natural environment to be dried
Air, is obtained a kind of environment-friendly high-efficiency of cold and the type of cooling of economy, has by the hot and humid area between water and air
Relatively low cooling device cost, can be greatly lowered power consumption, play an important role in energy-saving and emission-reduction, therefore, water chiller/heater
Group is widely used.
However, in using in the winter time, in particularly northerly winter, the water system local environment of water chiller-heater unit can be down to
Less than 0 DEG C, at a temperature of this, the water system of water chiller-heater unit is easily frozen, and therefore winter has antifreeze demand.In prior art,
Water system for preventing water chiller-heater unit is freezed, and would generally arrange anti-frost protection control device in water chiller-heater unit.But if
When user does not use water chiller-heater unit to place water chiller-heater unit power-off for a long time, due to anti-frost protection control device power-off, institute
Can be lost efficacy with antifreeze control.Therefore the water in water cooling and heating units system must be bled off, water system otherwise can be led to freeze, gently then
Water lines bursting by freezing, heavy then refrigerant pipe bursting by freezing in heat exchanger, and then lead to water to enter in fluorine system system to cause greater loss.But make
With during, user often forgets to discharge water after water chiller-heater unit power-off placement, so above harm often occurs, to
Extreme loss is caused at family.
Based on above description, need badly and want a kind of water chiller-heater unit anti-freeze protection device, to solve present in prior art
Because user's led to water system of forgetting to discharge water after water chiller-heater unit power-off placement is freezed, gently then water lines bursting by freezing, weight
Then refrigerant pipe bursting by freezing in heat exchanger, and then lead in water entrance fluorine system system, cause the problem of greater loss.
Content of the invention
In view of this, an object of the present invention is to provide a kind of water chiller-heater unit anti-freeze protection device, anti-frost protection
Device can carry out antifreeze detection by self-powered power supply after water chiller-heater unit power-off and judge, and it is cold to remind user to prevent in time
Hot water units are freezing.
The second object of the present invention is to provide a kind of water chiller-heater unit anti-frost protection method, and described anti-frost protection method should
For above-described water chiller-heater unit anti-freeze protection device, still can be able to be entered after water chiller-heater unit power-off by the method
The antifreeze detection of row judges, and reminds user to prevent water chiller-heater unit freezing in time.
The third object of the present invention is to provide a kind of water chiller-heater unit anti-frost protection method, and it is right to be can achieve by the method
The multiple prompting of user, improves water chiller-heater unit antifreeze reliability in the winter time.
The embodiment of the present invention employs the following technical solutions:
A kind of water chiller-heater unit anti-freeze protection device, described anti-freeze protection device is included for detecting environment temperature to be detected
Temperature sensor, alarm, controller and for powering for described temperature sensor, alarm, controller from powered
Source, described controller can receive the environment temperature of described temperature sensor transmission, and controllable described alarm is reported to the police.
Preferably, described temperature sensor includes testing circuit and the detection means being connected with described testing circuit,
Described detection means is used for detecting the temperature of environment to be detected and the environment temperature detecting being passed to described testing circuit.
Preferably, described alarm be can produce sound sound alarm subsystem, can produce light light crossing-signal or can be simultaneously
Produce sound with or light audible-visual annunciator.
Preferably, described detection means is temperature detector.
Preferably, described detection means is connected with described testing circuit by data wire, and it is located in environment to be detected.
Preferably, described self-powered for button power supply.
Preferably, described water chiller-heater unit includes manual operator, described anti-freeze protection device is built in described manual operator
Portion.
Preferably, described temperature sensor, alarm also respectively with the unit power supply powered for described water chiller-heater unit
It is connected.
A kind of water chiller-heater unit anti-frost protection method, described anti-frost protection method is applied to water chiller-heater unit as above
Anti-freeze protection device, described anti-frost protection method includes step:
Self-powered after s10, unit power cut-off power for controller；
S221, controller judge the unit power cut-off time whether more than the second preset time t 2, if so, then execution step
s222；
S222, controller control temperature sensor real-time detection ambient temperature value to be detected, and by detected environment
Temperature value passes to controller, afterwards execution step s223；
S223, controller judge continue detected ambient temperature value in the 3rd preset time t 3 whether be below pre-
If temperature t1, if so, then execution step s224；
S224, controller control alarm equipment alarm.
Preferably, further comprising the steps of between step s10 and step s211:
S211, controller judge the unit power cut-off time whether more than the first preset time t 1, if so, then execution step
s212；Wherein, t1 ＜ t2；
S212, controller control alarm equipment alarm.
Preferably, the span of described first preset time t 1 is 14～16s；The taking of described second preset time t 2
Value scope is 9～11min；The span of described 3rd preset time t 3 is 15～30s；The value model of described preset temperature t1
Enclose for 0～2 DEG C.
The Advantageous Effects of the technical scheme that the embodiment of the present invention proposes are:
(1) because the water chiller-heater unit anti-freeze protection device that the application provides is included for detecting environment temperature to be detected
Temperature sensor, alarm, controller and for for described temperature sensor, alarm, controller power self-powered,
Described controller can receive the environment temperature of described temperature sensor transmission, and controllable described alarm is reported to the police.Therefore,
Anti-freeze protection device can carry out antifreeze detection by self-powered power supply after water chiller-heater unit power-off and judge, and reminds use in time
Family prevents water chiller-heater unit freezing.The program solves the substantially antifreeze defense controls because of water chiller-heater unit power-off and lost efficacy, simultaneously
User forgets to discharge water again and leads to the water system icing of water chiller-heater unit and then the problem of freezing pipeline.
(2) the water chiller-heater unit anti-frost protection method being provided due to the application not only in the unit power cut-off time more than the
After one preset time t 1, controller controls alarm equipment alarm, but also in the unit power cut-off time more than the second Preset Time
T2, and when continuing that in the 3rd preset time t 3, detected ambient temperature value is below preset temperature t1, controller controls
Alarm equipment alarm, so can achieve multiple prompting to user by the method, improving water chiller-heater unit in the winter time antifreeze can
By property.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to institute in embodiment of the present invention description
Need use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only the present invention some enforcement
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be implemented according to the present invention
The content of example and these accompanying drawings obtain other accompanying drawings.
Fig. 1 is the structural representation of the water chiller-heater unit anti-freeze protection device that the application specific embodiment provides；
Fig. 2 is the water chiller-heater unit anti-frost protection method flow diagram that the application specific embodiment provides；
Fig. 3 is a kind of preferred embodiment flow process of the water chiller-heater unit anti-frost protection method that the application specific embodiment provides
Figure.
In figure:
1st, anti-freeze protection device；2nd, water chiller-heater unit；
11st, self-powered；12nd, temperature sensor；13rd, alarm；14th, controller；15th, controlling switch；
121st, testing circuit；122nd, data wire；123rd, detection means.
Specific embodiment
For make present invention solves the technical problem that, the technical scheme that adopts and the technique effect that reaches clearer, below
By combine accompanying drawing the technical scheme of the embodiment of the present invention is described in further detail it is clear that described embodiment only
It is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those skilled in the art exist
The every other embodiment being obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
Device embodiment
As shown in figure 1, the anti-freeze protection device 1 that the application provides is arranged in water chiller-heater unit 2.Described anti-frost protection dress
Put 1 to include temperature sensor 12, alarm 13, controller 14 and be used for as described temperature sensor 12, alarm 13, control
Self-powered the 11 of device 14 power supply.Described temperature sensor 12 is connected with controller 14.Described self-powered 11 pass through to lead respectively
Line is powered with temperature sensor 12, alarm 13 and controller 14.Preferably, connection described self-powered 11 and alarm 13
Controlling switch 15 is in series with wire, controller 14 is connected with controlling switch 15, controller 14 passes through to control described controlling switch
15 closure is controlling whether self-powered 11 be that alarm 13 is powered.Described temperature sensor 12 is used for detecting environment to be detected
Temperature, specific in the present embodiment, temperature sensor 12 is used for the water system local environment temperature that detection has water chiller-heater unit 2
Degree, and detected temperature value is passed to controller 14, not only temperature controllable sensor 12 is carried out described controller 14
Work, and receive the ambient temperature value of described temperature sensor 12 transmission, afterwards ambient temperature value is judged, according to judgement
Result and then decide whether to control described alarm 13 to be reported to the police, if necessary to report to the police, then controls described alarm 13 to carry out
Report to the police.
When the substantially antifreeze defense controls of water chiller-heater unit 2 power-off was lost efficacy, water chiller-heater unit 2 supplies by self-powered 11
Electricity carries out antifreeze detection and judges, and reminds user to prevent water chiller-heater unit 2 freezing in time.Solve when water chiller-heater unit 2 power-off
And antifreeze defense controls substantially was lost efficacy, user forgets to discharge water again and leads to the water system of water chiller-heater unit 2 to freeze and then jelly simultaneously
The problem of bad pipeline.
In the present embodiment, preferably, described temperature sensor 12 include testing circuit 121 and with described inspection
The detection means 123 that slowdown monitoring circuit 121 is connected, described detection means 123 is used for detecting the temperature of environment to be detected and detecting
Environment temperature pass to described testing circuit 121.The ring that described detection means 123 is passed over by described testing circuit 121
Border temperature passes to controller 14 after carrying out preliminary treatment.
In the present embodiment, preferably, described alarm 13 is can to produce the sound alarm subsystem of sound, can produce light
Light crossing-signal or the audible-visual annunciator that can simultaneously produce sound and light.Can produce after described audible-visual annunciator connection is self-powered
Raw obvious light and sound, warning effect is best.
In the present embodiment, preferably, described detection means 121 is temperature detector, is certainly not limited to temperature-sensitive
Device, can also be other detection means.
In the present embodiment, preferably, described detection means 123 (usually popping one's head in) by data wire 122 with
Described testing circuit 121 is connected, and described data wire 122 extends in detected environment so that detection means 123 is positioned to be detected
In environment.
In the present embodiment, preferably, described water chiller-heater unit 2 includes manual operator, this anti-freeze protection device 1 shape
Formula does not limit, can by the optimization design of manual operator is allowed to be built in manual operator internal be integrated with manual operator it is also possible to
As single protection device independent of water chiller-heater unit 2.
In the present embodiment, preferably, described temperature sensor 12, alarm 13 also respectively with for described cold and hot
The unit power supply of water dispenser group 2 power supply is connected, and incessantly has self-powered 11 power supplies, but also uses same confession with water chiller-heater unit 2
Power supply.
In the present embodiment, preferably, described self-powered 11 is button power supply.Certainly it is not limited to this
Power supply.Described button power supply is small-sized power supply, and the power supply using compact structure such as button cells is fabricated by, to ensure not
Itself manual operator of water chiller-heater unit 2 or the size of protection device can be caused to have a larger increase.This self-powered 11 is manual operator
Or protection device powers.When water chiller-heater unit 2 normally goes up electricity, manual operator or protection device pass through the direct powered operation of unit power supply,
After water chiller-heater unit 2 power down, manual operator or self-powered 11 startups of protection device are powered for it.
In the present embodiment, preferably, be provided with display screen in described manual operator, described display screen only with
Light when family operates to manual operator and be automatically switched off to save power supply after the t0 time that user stops operation.As excellent
Choosing, described t0 is preferably 10s but is not limited thereto.
Embodiment of the method
The water chiller-heater unit anti-frost protection method that the application provides is applied to above-described water chiller-heater unit anti-frost protection
Device, as shown in Fig. 2 described anti-frost protection method includes step:
After s10, unit power cut-off, self-powered 11 power for controller 14.
Whether s221, controller 14 judge the unit power cut-off time more than the second preset time t 2, if pre- more than second
If time t2, then execution step s222；Otherwise, controller 14 continues to judge whether the unit power cut-off time is default more than second
Time t2.
S222, controller 14 control temperature sensor 12 real-time detection ambient temperature value to be detected, and will be detected
Ambient temperature value passes to controller 14, afterwards execution step s223.
S223, controller 14 judge continuing whether detected ambient temperature value in the 3rd preset time t 3 is below
Preset temperature t1, if being below preset temperature t1 continuing detected ambient temperature value in the 3rd preset time t 3, holds
Row step s224；Otherwise, controller 14 continue to judge continuing detected ambient temperature value in the 3rd preset time t 3 be
No it is below preset temperature t1.
S224, controller 14 control alarm 13 to report to the police, until user passes through to operate manual operator or protection device to close report
Alert device, is not then then turned on afterwards.
Fig. 3 is a kind of preferred embodiment flow process of the water chiller-heater unit anti-frost protection method that the application specific embodiment provides
Figure.As shown in figure 3, preferably, also step s211 and step s212 are included between step s10 and step s211,
Entirely preferably water chiller-heater unit anti-frost protection method includes step:
After s10, unit power cut-off, self-powered 11 power for controller 14.
Whether s211, controller 14 judge the unit power cut-off time more than the first preset time t 1, if unit power supply breaks
The electric time is more than the first preset time t 1, then execution step s212；Otherwise, controller 14 continues to judge the unit power cut-off time
Whether more than the first preset time t 1.Wherein, t1 ＜ t2.
S212, controller 14 control alarm 13 to report to the police, until user passes through to operate manual operator or protection device to close report
Alert device 13, is not then then turned on afterwards.
Whether s221, controller 14 judge the unit power cut-off time more than the second preset time t 2, if pre- more than second
If time t2, then execution step s222；Otherwise, controller 14 continues to judge whether the unit power cut-off time is default more than second
Time t2.
S222, controller 14 control temperature sensor 12 real-time detection ambient temperature value to be detected, and will be detected
Ambient temperature value passes to controller 14, afterwards execution step s223.
S223, controller 14 judge continuing whether detected ambient temperature value in the 3rd preset time t 3 is below
Preset temperature t1, if being below preset temperature t1 continuing detected ambient temperature value in the 3rd preset time t 3, holds
Row step s224；Otherwise, controller 14 continue to judge continuing detected ambient temperature value in the 3rd preset time t 3 be
No it is below preset temperature t1.
S224, controller 14 control alarm 13 to report to the police, until user passes through to operate manual operator or protection device to close report
Alert device, is not then then turned on afterwards.
In the present embodiment, preferably, the span of described first preset time t 1 is 14～16s, enters one
Step is preferably 15s, but is not limited thereto.
In the present embodiment, preferably, the span of described second preset time t 2 is 9～11min, enters one
Step is preferably 10min, but is not limited thereto.
In the present embodiment, preferably, the span of described 3rd preset time t 3 is 15～30s, but simultaneously
It is not limited to this.
In the present embodiment, preferably, the span of described preset temperature t1 is 0～2 DEG C, but does not limit to
In this.
Due to the application provide water chiller-heater unit anti-frost protection method not only in the unit power cut-off time more than first
After preset time t 1, controller 14 controls alarm 13 to report to the police, but also in the unit power cut-off time more than the second Preset Time
T2, and when continuing that in the 3rd preset time t 3, detected ambient temperature value is below preset temperature t1, controller 14 is controlled
Alarm 13 processed is reported to the police, so can achieve multiple prompting to user by the method, improves water chiller-heater unit 2 in the winter time anti-
Freeze reliability.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other Equivalent embodiments more can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of water chiller-heater unit anti-freeze protection device is it is characterised in that described anti-freeze protection device (1) includes treating for detection
The detection temperature sensor (12) of environment temperature, alarm (13), controller (14) and for for described temperature sensor
(12), self-powered (11) that alarm (13), controller (14) are powered, described controller (14) can receive described TEMP
The environment temperature that device (12) transmits, and controllable described alarm (13) reported to the police；
Described controller (14) judges the unit power cut-off time whether more than the second preset time t 2, if so,
Controller (14) controls temperature sensor (12) real-time detection ambient temperature value to be detected, and by detected environment temperature
Angle value passes to controller (14)；Controller (14) judges continuing detected ambient temperature value in the 3rd preset time t 3
Whether it is below preset temperature t1, if so, controller (14) controls alarm (13) to report to the police.
2. water chiller-heater unit anti-freeze protection device as claimed in claim 1 is it is characterised in that described temperature sensor (12) wraps
Include testing circuit (121) and the detection means (123) being connected with described testing circuit (121), described detection means (123) is used
Pass to described testing circuit (121) in the temperature detecting environment to be detected and by the environment temperature detecting.
3. water chiller-heater unit anti-freeze protection device as claimed in claim 2 is it is characterised in that described alarm (13) is to produce
The sound alarm subsystem of raw sound, the light crossing-signal that light can be produced or the audible-visual annunciator that can simultaneously produce sound and light.
4. water chiller-heater unit anti-freeze protection device as claimed in claim 2 is it is characterised in that described detection means (123) is
Temperature detector；Described detection means (123) is connected with described testing circuit (121) by data wire (122), and is located at ring to be detected
In border.
5. water chiller-heater unit anti-freeze protection device as claimed in claim 1 is it is characterised in that described self-powered (11) are knob
Button power supply.
6. water chiller-heater unit anti-freeze protection device as claimed in claim 1 is it is characterised in that described water chiller-heater unit (2) wraps
Include manual operator, described anti-freeze protection device (1) is built in inside described manual operator.
7. water chiller-heater unit anti-freeze protection device as claimed in claim 1 it is characterised in that described temperature sensor (12),
Alarm (13) is also connected with the unit power supply powered for described water chiller-heater unit (2) respectively.
8. a kind of water chiller-heater unit anti-frost protection method, described anti-frost protection method is applied to cold and hot as claimed in claim 7
Water dispenser group anti-freeze protection device is it is characterised in that described anti-frost protection method includes step:
Self-powered (11) after s10, unit power cut-off is controller (14) power supply；
S221, controller (14) judge the unit power cut-off time whether more than the second preset time t 2, if so, then execution step
s222；
S222, controller (14) control temperature sensor (12) real-time detection ambient temperature value to be detected, and will be detected
Ambient temperature value passes to controller (14), execution step s223 afterwards；
S223, controller (14) judge continue detected ambient temperature value in the 3rd preset time t 3 whether be below pre-
If temperature t1, if so, then execution step s224；
S224, controller (14) control alarm (13) to report to the police.
9. water chiller-heater unit anti-frost protection method as claimed in claim 8 is it is characterised in that in step s10 and step s211
Between further comprising the steps of:
S211, controller (14) judge the unit power cut-off time whether more than the first preset time t 1, if so, then execution step
s212；Wherein, t1 ＜ t2；
S212, controller (14) control alarm (13) to report to the police.
10. water chiller-heater unit anti-frost protection method as claimed in claim 9 is it is characterised in that described first preset time t 1
Span be 14～16s；The span of described second preset time t 2 is 9～11min；Described 3rd preset time t 3
Span be 15～30s；The span of described preset temperature t1 is 0～2 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510139921.0A CN104729171B (en) | 2015-03-27 | 2015-03-27 | Cold-hot water unit anti-freezing protection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510139921.0A CN104729171B (en) | 2015-03-27 | 2015-03-27 | Cold-hot water unit anti-freezing protection device and method |
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| Publication Number | Publication Date |
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| CN104729171A CN104729171A (en) | 2015-06-24 |
| CN104729171B true CN104729171B (en) | 2017-01-25 |
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| CN201510139921.0A Active CN104729171B (en) | 2015-03-27 | 2015-03-27 | Cold-hot water unit anti-freezing protection device and method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105091260B (en) * | 2015-08-19 | 2018-05-22 | 广东美的暖通设备有限公司 | It is a kind of for the anti-freeze protection device of air-conditioner set water system and anti-frost protection method |
| CN105373055B (en) * | 2015-11-18 | 2017-12-05 | 珠海格力电器股份有限公司 | A kind of unit fault monitoring method, device and air-conditioning system |
| CN111238037A (en) * | 2020-02-20 | 2020-06-05 | 青岛海信日立空调***有限公司 | Hot water unit |
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| JP2004245479A (en) * | 2003-02-13 | 2004-09-02 | Calsonic Kansei Corp | Frost formation detecting method for refrigerating cycle using supercritical refrigerant and defrosting method using the same |
| KR20070005166A (en) * | 2005-07-05 | 2007-01-10 | 엘지전자 주식회사 | Control process for heat in air conditioner |
| CN201173550Y (en) * | 2008-01-09 | 2008-12-31 | 东莞市佛尔盛机电科技有限公司 | Central air-conditioning recirculated water device power saving automatic controller |
| CN202598868U (en) * | 2012-05-07 | 2012-12-12 | Tcl空调器(中山)有限公司 | Air energy heat-pump water heater |
| CN105485830A (en) * | 2015-06-12 | 2016-04-13 | *** | Constant-temperature and energy-saving control system for ground source heat pumps, and control method thereof |
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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004245479A (en) * | 2003-02-13 | 2004-09-02 | Calsonic Kansei Corp | Frost formation detecting method for refrigerating cycle using supercritical refrigerant and defrosting method using the same |
| KR20070005166A (en) * | 2005-07-05 | 2007-01-10 | 엘지전자 주식회사 | Control process for heat in air conditioner |
| CN201173550Y (en) * | 2008-01-09 | 2008-12-31 | 东莞市佛尔盛机电科技有限公司 | Central air-conditioning recirculated water device power saving automatic controller |
| CN202598868U (en) * | 2012-05-07 | 2012-12-12 | Tcl空调器(中山)有限公司 | Air energy heat-pump water heater |
| CN105485830A (en) * | 2015-06-12 | 2016-04-13 | *** | Constant-temperature and energy-saving control system for ground source heat pumps, and control method thereof |
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| CN104729171A (en) | 2015-06-24 |
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