CN108302835A - Handpiece Water Chilling Units and its control method - Google Patents
Handpiece Water Chilling Units and its control method Download PDFInfo
- Publication number
- CN108302835A CN108302835A CN201810049317.2A CN201810049317A CN108302835A CN 108302835 A CN108302835 A CN 108302835A CN 201810049317 A CN201810049317 A CN 201810049317A CN 108302835 A CN108302835 A CN 108302835A
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- Prior art keywords
- water
- inlet pipe
- cooling
- water inlet
- valve
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a kind of handpiece Water Chilling Units and its control method, handpiece Water Chilling Units include：It is sequentially connected compressor, condenser, throttling set and the evaporator for constituting refrigerant circuit and cooling water recirculation system, freezing water circulation system, frequency converter, cooling system and control assembly.Cooling water recirculation system includes the cooling water inlet pipe and cooling water outlet pipe being connected with condenser, it includes the chilled water water inlet pipe being connected with evaporator and chilled water outlet pipe to freeze water circulation system, cooling system includes water inlet pipe, outlet pipe and heat exchanging part, frequency converter is located in heat exchanging part, when the first end of water inlet pipe is connected to cooling water inlet pipe and the second end of outlet pipe is connected to cooling water outlet pipe, cooling system forms chilled(cooling) water return (CWR), when the first end of water inlet pipe is connected to chilled water water inlet pipe and the second end of outlet pipe is connected to chilled water outlet pipe, cooling system forms chilled water circuit.The good cooling and low in energy consumption of frequency converter may be implemented in handpiece Water Chilling Units according to the present invention.
Description
Technical field
The present invention relates to refrigeration technology fields, more particularly, to a kind of handpiece Water Chilling Units and its control method.
Background technology
In the related technology, the frequency converter in handpiece Water Chilling Units mostly uses the air-cooled type of cooling, the air-cooled type of cooling limited
In environment temperature, when environment temperature is excessively high either ventilation condition is bad when frequency converter will be unable to be winding is effectively cooled or cool down
Effect is excessively poor, and then influences the service life of frequency converter or be easy damage frequency converter.Also there are the relevant technologies cold using water cooling
But mode cools down frequency converter, but which is usually additionally furnished with water pump so that power consumption increases, and does not have economy.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, the present invention proposes that one kind is cold
The good cooling and low in energy consumption of frequency converter may be implemented in water dispenser group, the handpiece Water Chilling Units.
The invention also provides a kind of control methods of above-mentioned handpiece Water Chilling Units.
The handpiece Water Chilling Units of embodiment according to a first aspect of the present invention, including：It is sequentially connected the compression for constituting refrigerant circuit
Machine, condenser, throttling set and evaporator；With the cooling water recirculation system of condenser heat exchange, the cooling water circulation system
System includes the cooling water inlet pipe and cooling water outlet pipe being connected with the condenser；It is followed with the chilled water of the evaporator heat exchange
Loop system, the freezing water circulation system includes the chilled water water inlet pipe being connected with the evaporator and chilled water outlet pipe；With
In the frequency converter for the running frequency for controlling the compressor；Cooling system for cooling down the frequency converter, the cooling system
With the chilled(cooling) water return (CWR) and chilled water circuit that can mutually switch, the cooling system includes water inlet pipe, outlet pipe and has hot
The heat exchanging part of inverting chamber, the frequency converter are located in the heat exchanging part, the first end of the water inlet pipe selectively with it is described cold
But water water inlet pipe is connected to one in the chilled water water inlet pipe, the water inlet of the second end of the water inlet pipe and the heat exchanging part
Mouth is connected, and the first end of the outlet pipe is connected with the water outlet of the heat exchanging part, and the second end of the outlet pipe is selectively
Be connected to one in the cooling water outlet pipe and the chilled water outlet pipe, the water inlet pipe first end with it is described cold
But the water water inlet pipe connection and second end of the outlet pipe with the cooling water outlet pipe when being connected to, cooling system formation institute
State chilled(cooling) water return (CWR), the first end of the water inlet pipe be connected to the chilled water water inlet pipe and the second end of the outlet pipe with
When the chilled water outlet pipe connection, the cooling system forms the chilled water circuit；For controlling the cooling system
Control assembly.
Handpiece Water Chilling Units according to the ... of the embodiment of the present invention utilize the Inlet and outlet water pressure difference of the cooling water recirculation system of handpiece Water Chilling Units
Or the Inlet and outlet water pressure difference of freezing water circulation system, the circulation power of cooling water is provided for the cooling system of frequency converter, without
Additionally to increase water pump, realize and the zero-power of frequency converter is cooled down, while the cooling system has the cooling water that can mutually switch
Circuit and chilled water circuit, so as to switch over circuit according to the practical cooling effect of frequency converter, to realize to frequency converter
It is cooled down within the scope of relative constant temperature, so that frequency converter is operated in preferably temperature range, is extended
The service life of frequency converter.
According to some embodiments of the present invention, the first end of the water inlet pipe passes through the first water inlet pipe and the cooling water
Water inlet pipe is connected and the first end of the water inlet pipe is connected by the second water inlet pipe with the chilled water water inlet pipe, the water inlet
The first end of pipe is selectively connected to one in first water inlet pipe and second water inlet pipe, the outlet pipe
Second end be connected with the cooling water outlet pipe by the first exit branch and the second end of the outlet pipe goes out by second
Water branch pipe is connected with the chilled water outlet pipe, the second end of the outlet pipe selectively with first exit branch and institute
State a connection in the second exit branch.
Some alternative embodiments according to the present invention, the control assembly include：First import on-off valve, described first into
Mouth on-off valve is located on first water inlet pipe and for opening and closing first water inlet pipe；Second import break-make
Valve, the second import on-off valve are located on second water inlet pipe and for opening and closing second water inlet pipe；
First outlet on-off valve, the first outlet on-off valve are located on first exit branch and for opening and closing described
One exit branch；Second outlet on-off valve, the second outlet on-off valve are located on second exit branch and are used to open
With closing second exit branch.
Optionally, the control assembly includes：The adjustable valve assembly of aperture, the valve assembly is for adjusting institute
State the water flow of cooling system.
Further, the valve assembly includes：Adjustable first regulating valve of aperture, first regulating valve are located at institute
It states on the first water inlet pipe or first exit branch；Adjustable second regulating valve of aperture, second regulating valve are located at institute
It states on the second water inlet pipe or second exit branch.
According to some embodiments of the present invention, the control assembly includes：Go out water temperature for detect the cooling system
The leaving water temperature sensors of degree, the leaving water temperature sensors are located on the outlet pipe.
Further, the control assembly includes：The inflow temperature of inflow temperature for detecting the cooling system passes
Sensor, the inflow temperature sensor are located on the water inlet pipe.
Some alternative embodiments according to the present invention, the handpiece Water Chilling Units include：First check valve and the second check valve, institute
The first check valve is stated to be connected on first water inlet pipe, first check valve by the cooling water inlet pipe to described
One-way conduction on first water inlet pipe direction；Second check valve is connected on second water inlet pipe, and described second is single
To valve on by the chilled water water inlet pipe to second water inlet pipe direction one-way conduction.
Some alternative embodiments according to the present invention, the handpiece Water Chilling Units include：First filter and the second filter, institute
It states first filter to be connected on first water inlet pipe, second filter is connected on second water inlet pipe.
According to some embodiments of the present invention, the heat exchanging part is plate heat exchanger.
The control method of the handpiece Water Chilling Units of embodiment according to a second aspect of the present invention, the handpiece Water Chilling Units are according to the present invention
The handpiece Water Chilling Units of above-mentioned first aspect embodiment, the control assembly include the inflow temperature for detecting the cooling system
The leaving water temperature sensors of inflow temperature sensor and leaving water temperature for detecting the cooling system, the control method packet
Include following steps：Detect the inflow temperature Tbx of the cooling system and the leaving water temperature Tex of the cooling system；Described in judgement
The relative size of inflow temperature Tbx and water inlet set temperature Tb, the leaving water temperature Tex are relatively large with water outlet set temperature Te's
It is small, if when Tbx >=Tb and Tex >=Te, the cooling system is switched to chilled water circuit, if when Tbx ＜ Tb and Tex ＜ Te, institute
It states cooling system and is switched to chilled(cooling) water return (CWR).
The control method of handpiece Water Chilling Units according to the ... of the embodiment of the present invention, by according to above-mentioned temperature detection and corresponding control
System can make frequency converter be operated in the environment of opposite constant temperature, extend the service life of frequency converter, and control process it is simple,
Reliably.
According to some embodiments of the present invention, the control assembly includes：The adjustable valve assembly of aperture, the adjusting
Valve module is used to adjust the water flow of the cooling system, and the control method includes the following steps：It is cut in the cooling system
After being changed to the chilled water circuit or the chilled(cooling) water return (CWR), the leaving water temperature Tex of the cooling system is detected, and described in judgement
Whether leaving water temperature Tex is in the outlet water temperature range of setting, if leaving water temperature Tex is located at the outlet water temperature range of the setting
Interior, the aperture of the valve assembly is constant, if leaving water temperature Tex is higher than the outlet water temperature range of the setting, the adjusting
The aperture of valve module correspondingly increases, if leaving water temperature Tex is less than the outlet water temperature range of the setting, the valve assembly
Aperture correspondingly reduce.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein：
Fig. 1 is the part-structure schematic diagram of handpiece Water Chilling Units according to the ... of the embodiment of the present invention.
Reference numeral：
Condenser 1；Condenser casing 11；Cooling water inlet pipe 12；Cooling water outlet pipe 13；
Heat exchanging part 2；Water inlet pipe 3；First water inlet pipe 31；Second water inlet pipe 32；Inflow temperature sensor 33；Outlet pipe
4；First exit branch 41；Second exit branch 42；Leaving water temperature sensors 43；
First import on-off valve 51；First outlet on-off valve 52；Second import on-off valve 53；Second outlet on-off valve 54；
First regulating valve 61；Second regulating valve 62；First check valve 71；Second check valve 72；First filter 81；Second filter
82。
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated 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, limit
There is the feature of " first ", " second " to can explicitly or implicitly include one or more this feature surely.The present invention's
In description, unless otherwise indicated, the meaning of " plurality " is two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Handpiece Water Chilling Units according to the ... of the embodiment of the present invention are described below with reference to Fig. 1.
As shown in Figure 1, handpiece Water Chilling Units of embodiment according to a first aspect of the present invention, including：It is sequentially connected composition refrigerant
Compressor (not shown), condenser 1, throttling set (not shown) and the evaporator (not shown) in circuit, and it is cooling
Water circulation system, freezing water circulation system, frequency converter (not shown), cooling system and control assembly.Wherein, above-mentioned refrigerant
It is connected by refrigerant pipe between all parts in circuit.
Referring to Fig.1, cooling water recirculation system exchanges heat with condenser 1, and cooling water recirculation system includes being connected with condenser 1
Cooling water inlet pipe 12 and cooling water outlet pipe 13.Wherein, condenser 1 includes condenser casing 11, and condenser casing 11 has
A part for condensation chamber, the refrigerant pipe in refrigerant circuit is located in condensation chamber, the cooling water water inlet of cooling water recirculation system
Pipe 12 and cooling water outlet pipe 13 are connected with condenser casing 11, and the cooling water inlet pipe 12 of cooling water recirculation system and cold
But water outlet pipe 13 is connected to above-mentioned condensation chamber.Cooling water in cooling water recirculation system is entered cold by cooling water inlet pipe 12
Solidifying intracavitary simultaneously exchanges heat with condensation chamber inner refrigerant pipe, flows out condensation chamber, cooling water by cooling water outlet pipe 13 after heat exchange
Hydraulic pressure in the cooling water inlet pipe 12 of the circulatory system is more than the hydraulic pressure in the cooling water outlet pipe 13 of cooling water recirculation system.
Water circulation system and evaporator heat exchange are freezed, freezing water circulation system includes the chilled water water inlet being connected with evaporator
Pipe and chilled water outlet pipe.Wherein, evaporator includes evaporator shell, and evaporator shell has an evaporation cavity, in refrigerant circuit
The part of refrigerant pipe be located in evaporation cavity, freeze water circulation system chilled water water inlet pipe and chilled water outlet pipe with
Evaporator shell is connected, and the chilled water water inlet pipe of freezing water circulation system and chilled water outlet pipe connect with above-mentioned evaporation cavity
It is logical.Chilled water in freezing water circulation system entered in evaporation cavity by chilled water water inlet pipe and with the refrigerant pipe in evaporation cavity into
Row heat exchange, flows out evaporation cavity by chilled water outlet pipe after heat exchange, freezes the hydraulic pressure in the chilled water water inlet pipe of water circulation system
More than the hydraulic pressure in the chilled water outlet pipe of freezing water circulation system.
Frequency converter is used to control the running frequency of compressor, and cooling system is for cooling down frequency converter, and control assembly is for controlling
Cooling system processed.
Referring to Fig.1, cooling system has the chilled(cooling) water return (CWR) that can mutually switch and a chilled water circuit, cooling system include into
Water pipe 3, outlet pipe 4 and the heat exchanging part 2 with heat exchange chamber, frequency converter are located in heat exchanging part 2.The first end of water inlet pipe 3 selects
It is connected to one in cooling water inlet pipe 12 and chilled water water inlet pipe to property, the water inlet of the second end and heat exchanging part 2 of water inlet pipe 3
Mouth is connected, and the first end of outlet pipe 4 is connected with the water outlet of heat exchanging part 2, and the second end of outlet pipe 4 selectively goes out with cooling water
Water pipe 13 is connected to one in chilled water outlet pipe.
It is connected to cooling water inlet pipe 12 and the second end and cooling water outlet pipe of outlet pipe 4 in the first end of water inlet pipe 3
When 13 connection, cooling system forms chilled(cooling) water return (CWR).At this point, the sub-fraction water in cooling water inlet pipe 12 flows into water inlet pipe 3,
Remaining water in cooling water inlet pipe 12 flows into condensation chamber, and the water flowed into water inlet pipe 3 is flowed by the water inlet of heat exchanging part 2
In the heat exchange chamber of heat exchanging part 2, frequency converter is cooled down by heat exchanging part 2 and the heat exchange of frequency converter, the water in heat exchange chamber
Outlet pipe 4 is flowed into after exchanging heat with frequency converter.The Inlet and outlet water pressure difference for utilizing cooling water recirculation system as a result, can be frequency converter
Cooling system the circulation power of cooling water is provided realizes and the zero-power of frequency converter cooled down without additionally increasing water pump.
It is connected to chilled water water inlet pipe in the first end of water inlet pipe 3 and the second end of outlet pipe 4 connects with chilled water outlet pipe
When logical, cooling system forms chilled water circuit.At this point, the sub-fraction water in chilled water water inlet pipe flows into water inlet pipe 3, chilled water
Remaining water in water inlet pipe flows into evaporation cavity, and the water flowed into water inlet pipe 3 flows into heat exchanging part 2 by the water inlet of heat exchanging part 2
Heat exchange chamber in, frequency converter is cooled down by heat exchanging part 2 and the heat exchange of frequency converter, the water in heat exchange chamber and frequency converter
Outlet pipe 4 is flowed into after heat exchange, finally flows into chilled water outlet pipe.The Inlet and outlet water pressure difference of freezing water circulation system is utilized as a result,
The circulation power that chilled water can be provided for the cooling system of frequency converter is realized without additionally increasing water pump to frequency converter
Zero-power cooling.
Wherein it is possible to according to the practical cooling effect of frequency converter to the chilled(cooling) water return (CWR) of cooling system and chilled water circuit into
Row switching.For example, can be compared according to the temperature of detection frequency converter and the frequency converter operating temperature of setting, if detection frequency conversion
The temperature of device is greater than or equal to the frequency converter operating temperature of setting, illustrates that the cooling effect of frequency converter is bad, can pass through at this time
Control assembly control cooling system is switched to the lower chilled water circuit of temperature, to realize better cooling effect so that frequency conversion
Device better heat-radiation effect；If the temperature for detecting frequency converter is less than the frequency converter operating temperature of setting, illustrate the cooling temperature of frequency converter
It spends low, easy tos produce condensed water at this time and be also unfavorable for the work of frequency converter, control assembly control cooling can be passed through at this time
System is switched to the higher chilled(cooling) water return (CWR) of temperature, too low to avoid cooling temperature so that frequency converter is operated in opposite constant temperature
In environment.
In another example can also be compared with water outlet set temperature according to the leaving water temperature in the outlet pipe 4 of cooling system.
If it is detected that the leaving water temperature in water pipe 4 is greater than or equal to water outlet set temperature, illustrate that the cooling effect of frequency converter is bad, at this time
Cooling system can be controlled by control assembly be switched to the lower chilled water circuit of temperature, to realize preferably cooling effect,
Make frequency converter better heat-radiation effect；If it is detected that the leaving water temperature in water pipe 4 is less than water outlet set temperature, illustrate frequency converter
Cooling temperature is too low, easy tos produce condensed water at this time and is also unfavorable for the work of frequency converter, can pass through control assembly control at this time
Cooling system processed is switched to the higher chilled(cooling) water return (CWR) of temperature, too low to avoid cooling temperature so that frequency converter is operated in relatively
In the environment of constant temperature.In this embodiment, control assembly may include：Leaving water temperature for detecting cooling system goes out water temperature
Sensor 43 is spent, leaving water temperature sensors 43 can be located on outlet pipe 4.
For another example can also be carried out simultaneously with water outlet set temperature according to the leaving water temperature in the outlet pipe 4 of cooling system
Inflow temperature in comparison and water inlet pipe 3 is compared with water inlet set temperature.If it is detected that the leaving water temperature in water pipe 4 is big
In or equal to water outlet set temperature, and simultaneously the inflow temperature in water inlet pipe 3 be greater than or equal to water inlet set temperature, illustrate frequency conversion
The cooling effect of device is bad, and can control cooling system by control assembly at this time is switched to the lower chilled water circuit of temperature,
To realize preferably cooling effect so that frequency converter better heat-radiation effect；If it is detected that the leaving water temperature in water pipe 4 is less than water outlet
Set temperature, and the inflow temperature in water inlet pipe 3 is less than water inlet set temperature simultaneously, illustrates that the cooling temperature of frequency converter is too low,
Condensed water is easy tod produce at this time and is also unfavorable for the work of frequency converter, can control cooling system switching by control assembly at this time
It is too low to avoid cooling temperature for the higher chilled(cooling) water return (CWR) of temperature so that frequency converter is operated in the environment of opposite constant temperature.
In the embodiment, control assembly may include：The inflow temperature sensor 33 and use of inflow temperature for detecting cooling system
In the leaving water temperature sensors 43 of the leaving water temperature of detection cooling system, inflow temperature sensor 33 is located on water inlet pipe 3, is discharged
Temperature sensor 43 can be located on outlet pipe 4.
Due to need not additionally increase water pump for cooling down the cooling system of frequency converter in the present invention, reduce handpiece Water Chilling Units
Operating noise and relevant device, have many advantages, such as zero-power, efficiently, it is low noise, simple in structure, at low cost, and by cold
But the mutual switching of the chilled(cooling) water return (CWR) of system and chilled water circuit, may be implemented within the scope of relative constant temperature to frequency conversion
Device is cooled down, so that frequency converter is operated in preferably temperature range, extends the service life of frequency converter.
Optionally, above-mentioned heat exchanging part 2 can be plate heat exchanger.As a result, the structure of heat exchanging part 2 is simple and heat exchange is imitated
Fruit is good.
Handpiece Water Chilling Units according to the ... of the embodiment of the present invention utilize the Inlet and outlet water pressure difference of the cooling water recirculation system of handpiece Water Chilling Units
Or the Inlet and outlet water pressure difference of freezing water circulation system, the circulation power of cooling water is provided for the cooling system of frequency converter, without
Additionally to increase water pump, realize and the zero-power of frequency converter is cooled down, while the cooling system has the cooling water that can mutually switch
Circuit and chilled water circuit, so as to switch over circuit according to the practical cooling effect of frequency converter, to realize to frequency converter
It is cooled down within the scope of relative constant temperature, so that frequency converter is operated in preferably temperature range, is extended
The service life of frequency converter.
According to some embodiments of the present invention, referring to Fig.1, the first end of water inlet pipe 3 by the first water inlet pipe 31 with it is cold
But water water inlet pipe 12 is connected and the first end of water inlet pipe 3 is connected by the second water inlet pipe 32 with chilled water water inlet pipe.Water inlet pipe 3
First end be selectively connected to one in the first water inlet pipe 31 and the second water inlet pipe 32, the first of water inlet pipe 3
When end is connected to the first water inlet pipe 31, the first end of water inlet pipe 3 is connected by the first water inlet pipe 31 with cooling water inlet pipe 12
It is logical；When the first end of water inlet pipe 3 is connected to the second water inlet pipe 32, the first end of water inlet pipe 3 passes through the second water inlet pipe 32
It is connected to chilled water water inlet pipe.
The second end of outlet pipe 4 be connected with cooling water outlet pipe 13 by the first exit branch 41 and outlet pipe 4 second
End is connected by the second exit branch 42 with chilled water outlet pipe, the second end of outlet pipe 4 selectively with the first exit branch
41 are connected to one in the second exit branch 42.When the second end of outlet pipe 4 is connected to the first exit branch 41, outlet pipe
4 second end is connected to by the first exit branch 41 with cooling water outlet pipe 13；In the second end and the second water outlet branch of outlet pipe 4
When pipe 42 is connected to, the second end of outlet pipe 4 is connected to by the second exit branch 42 with chilled water outlet pipe.
As a result, by the first water inlet pipe 31 of setting and the first exit branch 41, cooling system is facilitated to be followed with cooling water
Loop system is connected；By the second water inlet pipe 32 and the second exit branch 42 of setting, cooling system is facilitated to be recycled with chilled water
System is connected.
Some alternative embodiments according to the present invention, referring to Fig.1, control assembly includes：First import on-off valve 51, second
Import on-off valve 53, first outlet on-off valve 52 and second outlet on-off valve 54.First import on-off valve 51 is located at the first water inlet
On branch pipe 31 and for opening and closing the first water inlet pipe 31, the second import on-off valve 53 be located on the second water inlet pipe 32 and
For opening and closing the second water inlet pipe 32, first outlet on-off valve 52 be located on the first exit branch 41 and be used to open and
The first exit branch 41 is closed, second outlet on-off valve 54 is located on the second exit branch 42 and goes out for opening and closing second
Water branch pipe 42.It is opened and 53 He of the second import on-off valve in the first import on-off valve 51 and first outlet on-off valve 52 as a result,
When second outlet on-off valve 54 is turned off, cooling system is switched to chilled(cooling) water return (CWR)；Go out in the first import on-off valve 51 and first
When mouth on-off valve 52 is turned off and the second import on-off valve 53 and second outlet on-off valve 54 are opened, cooling system is switched to cold
Freeze water loop.By the way that above-mentioned on-off valve is arranged, between the chilled(cooling) water return (CWR) and chilled water circuit that facilitate control cooling system
Mutually switching.
Optionally, above-mentioned first import on-off valve 51, the second import on-off valve 53, first outlet on-off valve 52 and second go out
Mouth on-off valve 54 all can be electrical ball valve.
Further, referring to Fig.1, control assembly may include：The adjustable valve assembly of aperture, valve assembly are used for
Adjust the water flow of cooling system.No matter cooling system is chilled(cooling) water return (CWR) or chilled water circuit as a result, passes through the tune of setting
Section valve module can adjust the water flow in cooling system, so as to further adjust cooling of the cooling system to frequency converter
Precision can precisely control the cooling temperature to frequency converter so that the working environment of frequency converter is closer to ideal perseverance
Warm environment.
For example, when cooling system is chilled(cooling) water return (CWR), it can be by detecting the temperature of frequency converter or going out for outlet pipe 4
Coolant-temperature gage, to adjust accordingly the aperture of valve assembly.It is higher than the setting work temperature of frequency converter in the temperature of detection frequency converter
When spending the leaving water temperature of range or outlet pipe 4 higher than the outlet water temperature range set, the aperture of valve assembly increases, from
And increase the water flow in cooling system, increase the cooling dynamics to frequency converter, so as to realize accurate thermostatic control；It is examining
The temperature of frequency converter is surveyed less than the setting operating temperature range of frequency converter or leaving water temperature the going out higher than setting of outlet pipe 4
When coolant-temperature gage range, the aperture of valve assembly reduces, and weakens the cooling dynamics to frequency converter, so as to realize accurate constant temperature
It adjusts.When cooling system is chilled water circuit, when the course of work of valve assembly is referred to above-mentioned chilled(cooling) water return (CWR)
The course of work, which is not described herein again.
In some specific embodiments of the present invention, referring to Fig.1, valve assembly includes：Aperture adjustable first is adjusted
Valve 61 and adjustable second regulating valve 62 of aperture, the first regulating valve 61 are located at the first water inlet pipe 31 or the first exit branch 41
On, when cooling system is formed as chilled(cooling) water return (CWR), by adjusting the aperture of the first regulating valve 61, the cooling water can be adjusted and returned
The water flow on road, so as to realize accurate thermostatic control at chilled(cooling) water return (CWR)；Second regulating valve 62 is located at the second water inlet branch
On pipe 32 or the second exit branch 42, when cooling system is formed as chilled water circuit, the second regulating valve 62 is cold for adjusting this
The water flow for freezing water loop, so as to realize accurate thermostatic control in chilled water circuit.Optionally, 61 He of the first regulating valve
Second regulating valve 62 all can be electric control valve.
Some alternative embodiments according to the present invention, referring to Fig.1, handpiece Water Chilling Units include：First check valve 71 and second is single
To valve 72.First check valve 71 is connected on the first water inlet pipe 31, and the first check valve 71 is by cooling water inlet pipe 12 to
One-way conduction on one water inlet pipe, 31 direction, can when cooling system is chilled(cooling) water return (CWR) by the first check valve 71 of setting
To prevent causing cooling water to backflow or go here and there water when locking system unusual fluctuations, the realization of constant temperature cooling is influenced.Second check valve 72 is gone here and there
It is associated on the second water inlet pipe 32, the second check valve 72 is unidirectionally led on by chilled water water inlet pipe to 32 direction of the second water inlet pipe
It is logical, when cooling system is chilled water circuit, by the second check valve 72 of setting, caused when system exception can be prevented to fluctuate
Chilled water backflows or goes here and there water, influences the realization of constant temperature cooling.
Some alternative embodiments according to the present invention, referring to Fig.1, handpiece Water Chilling Units include：First filter 81 and the second mistake
Filter 82, first filter 81 are connected on the first water inlet pipe 31, when cooling system is chilled(cooling) water return (CWR), pass through setting
First filter 81 can prevent from blocking cooling system；Second filter 82 is connected on the second water inlet pipe 32, in cooling system
When system is chilled water circuit, it can prevent from blocking cooling system by the second filter 82 of setting.
The control method of the handpiece Water Chilling Units of embodiment according to a second aspect of the present invention, wherein handpiece Water Chilling Units are according to the present invention
The handpiece Water Chilling Units of above-mentioned first aspect embodiment, further, control assembly include the inflow temperature for detecting cooling system
Inflow temperature sensor 33 and leaving water temperature for detecting cooling system leaving water temperature sensors 43, the control method
Include the following steps：
Detect the leaving water temperature Tex of the inflow temperature Tbx and cooling system of cooling system；
Judge relative size, the leaving water temperature Tex and water outlet set temperature Te of inflow temperature Tbx and set temperature Tb of intaking
Relative size,
If when Tbx >=Tb and Tex >=Te, illustrating that the cooling effect of frequency converter is bad, control assembly control can be passed through at this time
Cooling system processed is switched to the lower chilled water circuit of temperature, to realize preferably cooling effect so that frequency converter heat dissipation effect
More preferably,
If when Tbx ＜ Tb and Tex ＜ Te, illustrate that the cooling temperature of frequency converter is too low, easy to produce at this time condensed water and
It is unfavorable for the work of frequency converter, can control cooling system by control assembly at this time is switched to the higher cooling water of temperature time
Road, it is too low to avoid cooling temperature.
The control method of handpiece Water Chilling Units according to the ... of the embodiment of the present invention, by according to above-mentioned temperature detection and corresponding control
System can make frequency converter be operated in the environment of opposite constant temperature, extend the service life of frequency converter, and control process it is simple,
Reliably.
According to some embodiments of the present invention, control assembly includes：The adjustable valve assembly of aperture, valve assembly are used
In the water flow for adjusting cooling system, the control method includes the following steps：Cooling system be switched to chilled water circuit or
Behind chilled(cooling) water return (CWR), the leaving water temperature Tex of cooling system is detected, and judges whether leaving water temperature Tex in setting goes out water temperature
It spends in range.If leaving water temperature Tex is located in the outlet water temperature range of setting, the aperture of valve assembly is constant, cooling system
Water flow in system is constant, and the operating temperature of frequency converter is maintained within the scope of constant temperature；If leaving water temperature Tex is higher than the water outlet of setting
The aperture of temperature range, valve assembly correspondingly increases, and the water flow in cooling system increases, and enhances cooling dynamics so that
The operating temperature of frequency converter is maintained within the scope of constant temperature；If leaving water temperature Tex adjusts valve group less than the outlet water temperature range of setting
The aperture of part correspondingly reduces, and the water flow in cooling system reduces, and weakens cooling dynamics so that the operating temperature of frequency converter is protected
It holds within the scope of constant temperature.
No matter be formed as chilled(cooling) water return (CWR) or chilled water circuit in cooling system as a result, in the mistake of cooling system work
Whether Cheng Zhong, the leaving water temperature Tex by monitoring cooling system in real time monitor in the outlet water temperature range of setting according to real-time
Leaving water temperature Tex, the aperture of valve assembly is correspondingly adjusted, so that the operating temperature of frequency converter is maintained at permanent
In warm range, accurate thermostatic control is realized.
Handpiece Water Chilling Units and its control method according to an embodiment of the invention are described in detail referring to Fig. 1.
Referring to Fig.1, in the present embodiment, handpiece Water Chilling Units include the above-mentioned compressor for being sequentially connected composition refrigerant circuit
It is (not shown), condenser 1, throttling set (not shown) and evaporator (not shown) and cooling water recirculation system, cold
Freeze water circulation system, frequency converter (not shown), cooling system, control assembly, the first check valve 71, the second check valve 72, the
One filter 81 and the second filter 82.Wherein, cooling system includes above-mentioned heat exchanging part 2, water inlet pipe 3, outlet pipe 4, first
Water inlet pipe 31, the second water inlet pipe 32, the first exit branch 41 and the second exit branch 42.
Control assembly include above-mentioned the first import on-off valve 51, the second import on-off valve 53, first outlet on-off valve 52,
Second outlet on-off valve 54, the first regulating valve 61, the second regulating valve 62, inflow temperature sensor 33 and leaving water temperature sensors
43, there are communication, the second import logical between the first import on-off valve 51 and inflow temperature sensor 33, leaving water temperature sensors 43
It is disconnected to have communication, first outlet on-off valve 52 and water inlet between valve 53 and inflow temperature sensor 33, leaving water temperature sensors 43
There is communication between temperature sensor 33, leaving water temperature sensors 43, second outlet on-off valve 54 and inflow temperature sensor 33,
Have communication between leaving water temperature sensors 43, the first regulating valve 61, the second regulating valve 62 with leaving water temperature sensors 43 it
Between have communication.
Along the first import of water (flow) direction on-off valve 51, the first check valve 71 and first filter 81 be sequentially connected in series first into
On water branch pipe 31, it is sequentially connected in series in the first exit branch 41 along the first regulating valve of water (flow) direction 61 and first outlet on-off valve 52
On, it is sequentially connected in series in the second water inlet branch along the second import of water (flow) direction on-off valve 53, the second check valve 72 and the second filter 82
On pipe 32, it is sequentially connected in series on the second exit branch 42 along the second regulating valve of water (flow) direction 62 and second outlet on-off valve 54, into
Water temperature sensor 33 is located on water inlet pipe 3, and leaving water temperature sensors 43 are located on outlet pipe 4.As a result, cooling system
All parts are reasonably distributed, and facilitate the installation of all parts.
The control method of handpiece Water Chilling Units in the brief description embodiment.
In the present embodiment with Tb=30 ° of set temperature of intaking, leaving water temperature water outlet Te=50 ° of set temperature, set
It is illustrated for ranging from 37 ° -42 °.It should be noted that above-mentioned each temperature value is an example, it is above-mentioned each
Temperature value can specifically be set according to the concrete structure of handpiece Water Chilling Units, model, operating mode etc., be not limited to above-mentioned example value.
The inflow temperature Tbx of cooling system is detected by inflow temperature sensor 33, and passes through leaving water temperature sensors 43
The leaving water temperature Tex for detecting cooling system judges relative size, the leaving water temperature of inflow temperature Tbx and set temperature Tb of intaking
The relative size of Tex and water outlet set temperature Te.If when Tbx >=Tb and Tex >=Te (for example, Tbx >=30 ° and Tex >=50 °),
Illustrate that the cooling effect of frequency converter is bad, can control cooling system by control assembly at this time is switched to the lower freezing of temperature
Water loop, to realize preferably cooling effect so that frequency converter better heat-radiation effect.
After cooling system is switched to chilled water circuit, continues through leaving water temperature sensors 43 and detect going out for cooling system
Coolant-temperature gage Tex, and judge leaving water temperature Tex whether set outlet water temperature range (for example, outlet water temperature range as 37 °-
42 °) in.If leaving water temperature Tex is located in the outlet water temperature range of setting, the aperture of the first regulating valve 61 is constant, cooling system
Water flow in system is constant, and the operating temperature of frequency converter is maintained within the scope of constant temperature；If leaving water temperature Tex is higher than the water outlet of setting
Temperature range (for example, leaving water temperature Tex is higher than 42 °), the aperture of the first regulating valve 61 correspondingly increases, the water in cooling system
Flow increases, and enhances cooling dynamics so that the operating temperature of frequency converter is maintained within the scope of constant temperature；If leaving water temperature Tex is less than
The outlet water temperature range (for example, leaving water temperature Tex is less than 37 °) of setting, the aperture of the first regulating valve 61 correspondingly reduces, cooling
Water flow in system reduces, and weakens cooling dynamics so that the operating temperature of frequency converter is maintained within the scope of constant temperature.
If when Tbx ＜ Tb and Tex ＜ Te (for example, 50 ° of 30 ° of Tbx ＜ and Tex ＜), illustrate the cooling temperature mistake of frequency converter
It is low, condensed water is easy tod produce at this time and is also unfavorable for the work of frequency converter, can control cooling system by control assembly at this time
It is switched to the higher chilled(cooling) water return (CWR) of temperature, it is too low to avoid cooling temperature.
After cooling system is switched to chilled(cooling) water return (CWR), continues through leaving water temperature sensors 43 and detect going out for cooling system
Coolant-temperature gage Tex, and judge leaving water temperature Tex whether set outlet water temperature range (for example, outlet water temperature range as 37 °-
42 °) in.If leaving water temperature Tex is located in the outlet water temperature range of setting, the aperture of the first regulating valve 61 is constant, cooling system
Water flow in system is constant, and the operating temperature of frequency converter is maintained within the scope of constant temperature；If leaving water temperature Tex is higher than the water outlet of setting
Temperature range (for example, leaving water temperature Tex is higher than 42 °), the aperture of the first regulating valve 61 correspondingly increases, the water in cooling system
Flow increases, and enhances cooling dynamics so that the operating temperature of frequency converter is maintained within the scope of constant temperature；If leaving water temperature Tex is less than
The outlet water temperature range (for example, leaving water temperature Tex is less than 37 °) of setting, the aperture of the first regulating valve 61 correspondingly reduces, cooling
Water flow in system reduces, and weakens cooling dynamics so that the operating temperature of frequency converter is maintained within the scope of constant temperature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot
Structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned term
Schematic representation may not refer to the same embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can be combined in any suitable manner in any one or more of the embodiments or examples.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The range of invention is limited by claim and its equivalent.
Claims (12)
1. a kind of handpiece Water Chilling Units, which is characterized in that including：
It is sequentially connected compressor, condenser, throttling set and the evaporator for constituting refrigerant circuit；
With the cooling water recirculation system of condenser heat exchange, the cooling water recirculation system includes being connected with the condenser
Cooling water inlet pipe and cooling water outlet pipe；
With the freezing water circulation system of the evaporator heat exchange, the freezing water circulation system includes being connected with the evaporator
Chilled water water inlet pipe and chilled water outlet pipe；
Frequency converter for the running frequency for controlling the compressor；
Cooling system for cooling down the frequency converter, the cooling system have the chilled(cooling) water return (CWR) that can mutually switch and freezing
Water loop, the cooling system include water inlet pipe, outlet pipe and the heat exchanging part with heat exchange chamber, and the frequency converter is located at described
In heat exchanging part, the first end of the water inlet pipe selectively with one in the cooling water inlet pipe and the chilled water water inlet pipe
A connection, the second end of the water inlet pipe are connected with the water inlet of the heat exchanging part, and the first end of the outlet pipe is changed with described
The water outlet in hot portion is connected, and the second end of the outlet pipe is selectively discharged with the cooling water outlet pipe and the chilled water
One in pipe connection is connected to and the second end of the outlet pipe in the first end of the water inlet pipe with the cooling water inlet pipe
When being connected to the cooling water outlet pipe, the cooling system forms the chilled(cooling) water return (CWR), in the first end of the water inlet pipe
It is connected to the chilled water water inlet pipe and when the second end of the outlet pipe is connected to the chilled water outlet pipe, the cooling system
System forms the chilled water circuit；
Control assembly for controlling the cooling system.
2. handpiece Water Chilling Units according to claim 1, which is characterized in that the first end of the water inlet pipe passes through the first water inlet branch
Pipe is connected with the cooling water inlet pipe and the first end of the water inlet pipe is intake by the second water inlet pipe and the chilled water
Pipe is connected, the first end of the water inlet pipe selectively with one in first water inlet pipe and second water inlet pipe
Connection, the second end of the outlet pipe be connected with the cooling water outlet pipe by the first exit branch and the outlet pipe the
Two ends are connected by the second exit branch with the chilled water outlet pipe, and the second end of the outlet pipe is selectively with described
One exit branch is connected to one in second exit branch.
3. handpiece Water Chilling Units according to claim 2, which is characterized in that the control assembly includes：
First import on-off valve, the first import on-off valve are located on first water inlet pipe and for opening and closing institute
State the first water inlet pipe；
Second import on-off valve, the second import on-off valve are located on second water inlet pipe and for opening and closing institute
State the second water inlet pipe；
First outlet on-off valve, the first outlet on-off valve are located on first exit branch and for opening and closing institute
State the first exit branch；
Second outlet on-off valve, the second outlet on-off valve are located on second exit branch and for opening and closing institute
State the second exit branch.
4. handpiece Water Chilling Units according to claim 3, which is characterized in that the control assembly includes：The adjustable adjusting of aperture
Valve module, the valve assembly are used to adjust the water flow of the cooling system.
5. handpiece Water Chilling Units according to claim 4, which is characterized in that the valve assembly includes：
Adjustable first regulating valve of aperture, first regulating valve are located at first water inlet pipe or first exit branch
On；
Adjustable second regulating valve of aperture, second regulating valve are located at second water inlet pipe or second exit branch
On.
6. handpiece Water Chilling Units according to claim 1, which is characterized in that the control assembly includes：It is described cold for detecting
But the leaving water temperature sensors of the leaving water temperature of system, the leaving water temperature sensors are located on the outlet pipe.
7. handpiece Water Chilling Units according to claim 6, which is characterized in that the control assembly includes：It is described cold for detecting
But the inflow temperature sensor of the inflow temperature of system, the inflow temperature sensor are located on the water inlet pipe.
8. handpiece Water Chilling Units according to claim 2, which is characterized in that including：First check valve and the second check valve, it is described
First check valve is connected on first water inlet pipe, and first check valve is by the cooling water inlet pipe to described
One-way conduction on one water inlet pipe direction；Second check valve is connected on second water inlet pipe, and described second is unidirectional
Valve one-way conduction on by the chilled water water inlet pipe to second water inlet pipe direction.
9. handpiece Water Chilling Units according to claim 2, which is characterized in that including：First filter and the second filter, it is described
First filter is connected on first water inlet pipe, and second filter is connected on second water inlet pipe.
10. according to the handpiece Water Chilling Units described in any one of claim 1-9, which is characterized in that the heat exchanging part is plate-type heat-exchange
Device.
11. a kind of control method of handpiece Water Chilling Units according to any one of claim 1-10, which is characterized in that the control
Component processed includes the inflow temperature sensor of the inflow temperature for detecting the cooling system and for detecting the cooling system
The leaving water temperature sensors of the leaving water temperature of system, the control method include the following steps：
Detect the inflow temperature Tbx of the cooling system and the leaving water temperature Tex of the cooling system；
Judge relative size, the leaving water temperature Tex and the water outlet setting temperature of the inflow temperature Tbx and set temperature Tb of intaking
The relative size of Te is spent,
If when Tbx >=Tb and Tex >=Te, the cooling system is switched to the chilled water circuit,
If when Tbx ＜ Tb and Tex ＜ Te, the cooling system is switched to the chilled(cooling) water return (CWR).
12. the control method of handpiece Water Chilling Units according to claim 11, which is characterized in that the control assembly includes：It opens
Adjustable valve assembly is spent, the valve assembly is used to adjust the water flow of the cooling system, the control method packet
Include following steps：
After the cooling system is switched to the chilled water circuit or the chilled(cooling) water return (CWR), going out for the cooling system is detected
Coolant-temperature gage Tex, and the leaving water temperature Tex is judged whether in the outlet water temperature range of setting,
If leaving water temperature Tex is located in the outlet water temperature range of the setting, the aperture of the valve assembly is constant,
If leaving water temperature Tex is higher than the outlet water temperature range of the setting, the aperture of the valve assembly correspondingly increases,
If leaving water temperature Tex is less than the outlet water temperature range of the setting, the aperture of the valve assembly correspondingly reduces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810049317.2A CN108302835A (en) | 2018-01-18 | 2018-01-18 | Handpiece Water Chilling Units and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810049317.2A CN108302835A (en) | 2018-01-18 | 2018-01-18 | Handpiece Water Chilling Units and its control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108302835A true CN108302835A (en) | 2018-07-20 |
Family
ID=62865505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810049317.2A Pending CN108302835A (en) | 2018-01-18 | 2018-01-18 | Handpiece Water Chilling Units and its control method |
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| Country | Link |
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| CN (1) | CN108302835A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981216A (en) * | 2018-07-27 | 2018-12-11 | 苏州新冠信制冷设备有限公司 | A kind of novel water cooler and its control method |
| CN110553423A (en) * | 2019-09-17 | 2019-12-10 | 珠海格力电器股份有限公司 | Cooling structure of water chilling unit and water chilling unit |
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| CN201656747U (en) * | 2009-12-29 | 2010-11-24 | 上海瑞伯德智能系统科技有限公司 | Water cooling radiator used for frequency converter |
| CN201789409U (en) * | 2010-08-02 | 2011-04-06 | 麦克维尔空调制冷(武汉)有限公司 | Frequency converter chilled water cooling device |
| CN202303780U (en) * | 2011-09-29 | 2012-07-04 | 厦门烟草工业有限责任公司 | Control system utilizing cooling water to directly supply cold |
| CN106546045A (en) * | 2016-11-21 | 2017-03-29 | 珠海格力电器股份有限公司 | Frequency converter cooling device, air conditioning unit and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4729424A (en) * | 1985-04-05 | 1988-03-08 | Nec Corporation | Cooling system for electronic equipment |
| CN201656747U (en) * | 2009-12-29 | 2010-11-24 | 上海瑞伯德智能系统科技有限公司 | Water cooling radiator used for frequency converter |
| CN201789409U (en) * | 2010-08-02 | 2011-04-06 | 麦克维尔空调制冷(武汉)有限公司 | Frequency converter chilled water cooling device |
| CN202303780U (en) * | 2011-09-29 | 2012-07-04 | 厦门烟草工业有限责任公司 | Control system utilizing cooling water to directly supply cold |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108981216A (en) * | 2018-07-27 | 2018-12-11 | 苏州新冠信制冷设备有限公司 | A kind of novel water cooler and its control method |
| CN110553423A (en) * | 2019-09-17 | 2019-12-10 | 珠海格力电器股份有限公司 | Cooling structure of water chilling unit and water chilling unit |
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