CN105466056A - Water chilling unit - Google Patents
Water chilling unit Download PDFInfo
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- CN105466056A CN105466056A CN201510963910.4A CN201510963910A CN105466056A CN 105466056 A CN105466056 A CN 105466056A CN 201510963910 A CN201510963910 A CN 201510963910A CN 105466056 A CN105466056 A CN 105466056A
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- compressor
- water chilling
- condenser
- chilling units
- handpiece water
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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
Abstract
The invention discloses a water chilling unit. The water chilling unit comprises a compressor, a condenser, an evaporator, a first throttling device and a control device. The compressor is a centrifugal magnetic-levitation compressor and is provided with an exhaust port and an air return port. The first end of the condenser is connected with the exhaust port. The evaporator is a falling film type shell tube heat exchanger and is provided with a refrigerant inlet and a refrigerant outlet, wherein the refrigerant outlet is connected with the air return port. The first end of the first throttling device is connected with the refrigerant inlet, and the second end of the first throttling device is connected with the second end of the condenser. The control device is connected with the compressor and the first throttling device so as to control the working state of the compressor and the working state of the first throttling device. According to the water chilling unit, the problems that a water chilling unit is high in noise and large in vibration, and the heat exchange capacity of a system is poor due to refrigeration oil are solved, the performance and use comfort of the water chilling unit are improved, and the refrigerant charge of the water chilling unit can be greatly reduced.
Description
Technical field
The present invention relates to refrigerating field, especially relate to a kind of handpiece Water Chilling Units.
Background technology
Conventional refrigeration compressor relies on bearing provide support and need refrigeration oil as lubrication, has a large amount of lubricating oil to enter systematic influence heat exchanger exchange capability of heat, have mechanical friction in addition, have very large vibration and noise when unit operation.
And full liquid conventional in handpiece Water Chilling Units and dry evaporator have the inferior positions such as exchange capability of heat is poor, cold-producing medium use amount is large, also there is very baneful influence to the performance of unit.Unit allocation mainly adopts the degree of superheat to control, sensor error and departure large.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, the present invention proposes a kind of handpiece Water Chilling Units, has the advantage of low vibration, quiet, high energy efficiency, can greatly reduce the refrigerant charge of handpiece Water Chilling Units.
According to the handpiece Water Chilling Units of the embodiment of the present invention, comprising: compressor, described compressor is centrifugal magnetic suspension compressor, and described compressor has exhaust outlet and gas returning port; Condenser, the first end of described condenser is connected with described exhaust outlet; Evaporimeter, described evaporimeter is falling film type case tube heat exchanger, and described evaporimeter has refrigerant inlet and refrigerant outlet, and described refrigerant outlet is connected with described gas returning port; First throttle device, the first end of described first throttle device is connected with described refrigerant inlet, and the second end of described first throttle device is connected with the second end of described condenser; Control device, described control device is connected with described first throttle device the duty controlling described compressor and described first throttle device with described compressor.
According to the handpiece Water Chilling Units of the embodiment of the present invention, by adopting centrifugal magnetic suspension compressor, solve the problem that handpiece Water Chilling Units noise is high, vibration is large, system causes exchange capability of heat difference because of refrigeration oil, make handpiece Water Chilling Units have the advantage of low vibration, quiet, high energy efficiency, improve performance and the comfort of handpiece Water Chilling Units.Simultaneously by adopting falling film type case tube heat exchanger as evaporimeter, the refrigerant charge of handpiece Water Chilling Units can be greatly reduced.
In some embodiments of the invention, described compressor has gas supplementing opening, described handpiece Water Chilling Units also comprises economizer, described economizer has the first coolant channel and the second refrigerant passage of mutual heat exchange, the entrance of described first coolant channel is connected with the first end of the second throttling arrangement, the outlet of described first coolant channel is connected with described gas supplementing opening, second end of described second throttling arrangement is connected with the second end of described condenser, the two ends of described second refrigerant passage are connected with the second end of described first throttle device with the second end of described condenser respectively.
Preferably, described first throttle device is electric expansion valve.
In further embodiment of the present invention, described second throttling arrangement is electric expansion valve, and described control device is connected with described second throttling arrangement the aperture controlling described second throttling arrangement.
In some embodiments of the invention, handpiece Water Chilling Units also comprises the cooling flowing path for cooling the motor of described compressor, described cooling flowing path is in series with the 3rd throttling arrangement and control valve, one end of described cooling flowing path is connected with the second end of described condenser.
In some embodiments of the invention, handpiece Water Chilling Units also comprises the liquid level sensor for detecting described liquid level in evaporator, described liquid level sensor is connected with described control device, and described control device controls the aperture of described first throttle device according to the testing result of described liquid level sensor.
Alternatively, described condenser is finned heat exchanger.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of handpiece Water Chilling Units according to an embodiment of the invention;
Fig. 2 is the schematic diagram of handpiece Water Chilling Units in accordance with another embodiment of the present invention.
Reference numeral:
Handpiece Water Chilling Units 100,
Compressor 1, exhaust outlet a, gas returning port b, gas supplementing opening c,
Condenser 2, evaporimeter 3, refrigerant inlet d, refrigerant outlet e,
First throttle device 4,
Economizer 5, second throttling arrangement 50, heat exchange module 51,
Cooling flowing path 6,
Liquid level sensor 7, gauge tap 8.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection or each other can communication; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
The handpiece Water Chilling Units 100 according to the embodiment of the present invention is described in detail below with reference to Fig. 1 and Fig. 2.
As depicted in figs. 1 and 2, according to the handpiece Water Chilling Units 100 of the embodiment of the present invention, comprise: compressor 1, condenser 2, evaporimeter 3, first throttle device 4 and control device (scheming not shown), wherein compressor 1 is centrifugal magnetic suspension compressor, and compressor 1 has exhaust outlet a and gas returning port b.What needs were described is, centrifugal magnetic suspension compressor 1 refers to that bearing adopts magnetic levitation technology (being equivalent to the bearing utilizing gas as rotating shaft), therefore centrifugal magnetic suspension compressor 1 has without advantages such as oil, low noise, nothing frictions, thus solves in existing refrigeration system because refrigeration oil, mechanical friction etc. affect the performance of handpiece Water Chilling Units and the problem of comfort difference.Also need to be described, the concrete structure of centrifugal magnetic suspension compressor 1 and operation principle have been prior art, are not just described in detail this at this.
The first end of condenser 2 is connected with exhaust outlet a, and particularly, condenser 2 can adopt water cooling heat exchanger also can adopt air cooling heat exchanger.Alternatively, condenser 2 is finned heat exchanger.
Evaporimeter 3 is falling film type case tube heat exchanger, and evaporimeter 3 has refrigerant inlet d and refrigerant outlet e, and refrigerant outlet e is connected with gas returning port b.The cold-producing medium wherein entering falling film type case tube heat exchanger from refrigerant inlet d by the distributor at heat exchanger top be divided evenly spray in heat exchanger in heat conduction tubes, heat of vaporization in refrigerant suction, thus falling film type case tube heat exchanger makes cold-producing medium be assigned on interior heat conduction tubes more uniformly, to exchange the higher coefficient of heat transfer for than full liquid evaporimeter and the less cold-producing medium of dry evaporator, thus improve unit performance.Need to be described, the concrete structure of falling film type case tube heat exchanger and operation principle have been prior art, are not just described in detail here.
The first end of first throttle device 4 is connected with refrigerant inlet d, and the second end of first throttle device 4 is connected with the second end of condenser 2.Wherein first throttle device 4 plays the effect of reducing pressure by regulating flow, and alternatively, first throttle device 4 is electric expansion valve.
The duty that control device is connected to control compressor 1 and first throttle device 4 with first throttle device 4 with compressor 1.
When handpiece Water Chilling Units 100 works, the cold-producing medium of discharging from the exhaust outlet a of compressor 1 enters into condenser 2 and carries out condensation, be drained into evaporimeter 3 from refrigerant inlet d after the reducing pressure by regulating flow of first throttle device 4 from the cold-producing medium of condenser 2 discharge and carry out evaporation endothermic to reduce indoor environment temperature, the cold-producing medium of discharging from the refrigerant outlet e of evaporimeter 3 is expelled back into compressor 1 from gas returning port b, completes kind of refrigeration cycle.
According to the handpiece Water Chilling Units 100 of the embodiment of the present invention, by adopting centrifugal magnetic suspension compressor 1, solve the problem that handpiece Water Chilling Units 100 noise is high, vibration is large, system causes exchange capability of heat difference because of refrigeration oil, make handpiece Water Chilling Units 100 have the advantage of low vibration, quiet, high energy efficiency, improve performance and the comfort of handpiece Water Chilling Units 100.Simultaneously by adopting falling film type case tube heat exchanger as evaporimeter 3, the refrigerant charge of handpiece Water Chilling Units 100 can be greatly reduced.
As shown in Figure 2, in further embodiment of the present invention, compressor 1 has gas supplementing opening c, handpiece Water Chilling Units 100 also comprises economizer 5, economizer 5 has the first coolant channel and the second refrigerant passage of mutual heat exchange, the entrance of the first coolant channel is connected with the first end of the second throttling arrangement 50, the outlet of the first coolant channel is connected with gas supplementing opening c, second end of the second throttling arrangement 50 is connected with the second end of condenser 2, and the two ends of second refrigerant passage are connected with the second end of first throttle device 4 with the second end of condenser 2 respectively.Cold-producing medium in the first coolant channel after heat exchange is expelled back into compressor 1 from gas supplementing opening c and carries out secondary tonifying Qi.Cold-producing medium in second refrigerant passage after heat exchange is drained in first throttle device 4 and carries out reducing pressure by regulating flow, is drained into evaporimeter 3 evaporates from the cold-producing medium of first throttle device 4 discharge.Thus by being provided with economizer 5, the efficiency of compressor a kind of refrigeration cycle can be improved, improve refrigerating capacity, reduce the delivery temperature of compressor 1.
Preferably, the second throttling arrangement 50 is electric expansion valve, and control device is connected with the second throttling arrangement 50 aperture controlling the second throttling arrangement 50.Thus accurately control to cover overheated gas to compressor 1 secondary by electric expansion valve 50, thus improve unit performance and reliability.
In further embodiment of the present invention, as depicted in figs. 1 and 2, handpiece Water Chilling Units 100 also comprises the cooling flowing path 6 for cooling the motor of compressor 1, cooling flowing path 6 is in series with the 3rd throttling arrangement (scheming not shown) and control valve (scheming not shown), one end of cooling flowing path 6 is connected with the second end of condenser 2.Control valve has open mode and closed condition, when control valve is in open mode, the part of refrigerant of discharging from condenser 2 enters into cooling flowing path 6, the cold-producing medium entering into cooling flowing path 6 becomes low-temp low-pressure gas liquid mixture after the reducing pressure by regulating flow of the 3rd throttling arrangement, the cold-producing medium of discharging from cooling flowing path 6 can cool motor, to reduce the temperature of motor, improve the service life of motor.
As depicted in figs. 1 and 2, in some embodiments of the invention, handpiece Water Chilling Units 100 also comprises the liquid level sensor 7 for detecting liquid level in evaporimeter 3, and liquid level sensor 7 is connected with control device, and control device controls the aperture of first throttle device 4 according to the testing result of liquid level sensor 7.Thus by being provided with liquid level sensor 7, can ensure that the liquid level in evaporimeter 3 is lower, avoid compressor 1 absorbing gas belt liquid, extend unit service life.Further, first throttle device 4 is electric expansion valve, thus by the mode that liquid level sensor 7 and electric expansion valve 4 combine, more accurately can control there is lower refrigerant level in evaporimeter 3, to avoid compressor 1 absorbing gas belt liquid further, extend unit service life.
The handpiece Water Chilling Units 100 according to the present invention's two specific embodiments is described in detail below with reference to Fig. 1 and Fig. 2.
Embodiment 1:
As shown in Figure 1, in this embodiment, handpiece Water Chilling Units 100 comprises: compressor 1, condenser 2, evaporimeter 3, first throttle device 4, control device, liquid level sensor 7 and cooling flowing path 6, and wherein compressor 1 is centrifugal magnetic suspension compressor, and compressor 1 has exhaust outlet a and gas returning port b.Evaporimeter 3 is falling film type case tube heat exchanger, and evaporimeter 3 has refrigerant inlet d and refrigerant outlet e.First throttle device 4 is electric expansion valve.
The first end of condenser 2 is connected with exhaust outlet a, and refrigerant outlet e is connected with gas returning port b, and the two ends of first throttle device 4 are connected with refrigerant inlet d with the second end of condenser 2 respectively.
Control device is connected with first throttle device 4 with compressor 1, and control device can control the opening and closing of compressor 1, and control device can control the aperture of first throttle device 4.
As shown in Figure 1, liquid level sensor 7 is for detecting the liquid level in evaporimeter 3, and liquid level sensor 7 is connected with control device, and control device controls the aperture of first throttle device 4 according to the testing result of liquid level sensor 7.
Cooling flowing path 6, for cooling the motor of compressor 1, cooling flowing path 6 is in series with the 3rd throttling arrangement and control valve, and one end of cooling flowing path 6 is connected with the second end of condenser 2.Particularly, the 3rd throttling arrangement and control valve can be located in compressor 1.Alternatively, the 3rd throttling arrangement can be capillary, and control valve can be magnetic valve.
When handpiece Water Chilling Units 100 is run, the gaseous refrigerant of low-temp low-pressure enters compressor 1 from gas returning port b, the gaseous refrigerant of rear formation HTHP is compressed by compressor 1, then cold-producing medium enters into condenser 2 again and is cooled to cryogenic high pressure liquid, cryogenic high pressure liquid refrigerant becomes low-temp low-pressure gas liquid mixture after first throttle device 4 reducing pressure by regulating flow, and last cold-producing medium enters into the refrigerant gas again becoming low-temp low-pressure after evaporimeter 3 absorbs heat.
Liquid level sensor 7 detects the liquid level in evaporimeter 3, control device controls the aperture of first throttle device 4 to control to enter into through first throttle device 4 amount of the cold-producing medium in evaporimeter 3 according to the testing result of liquid level sensor 7, thus by the control mode in conjunction with liquid level sensor 7 and electric expansion valve, the refrigerant amount of handpiece Water Chilling Units 100 is ensured with more accurate Liquid level, guarantee that refrigerant level in evaporimeter 3 is lower and avoid compressor 1 absorbing gas belt liquid, extending the service life of handpiece Water Chilling Units 100.It is appreciated of course that, the amount of the cold-producing medium entered in evaporimeter 3 can also be controlled by detecting the mode such as the exhaust of handpiece Water Chilling Units 100 or the degree of superheat of air-breathing.
When control valve is in open mode, the part of refrigerant of discharging from condenser 2 enters into cooling flowing path 6, the cold-producing medium entering into cooling flowing path 6 becomes low-temp low-pressure gas liquid mixture after the reducing pressure by regulating flow of the 3rd throttling arrangement, the cold-producing medium of discharging from cooling flowing path 6 can cool motor, to reduce the temperature of motor, improve the service life of motor.
According to the handpiece Water Chilling Units 100 of the embodiment of the present invention, performance and the comfort of handpiece Water Chilling Units 100 can be improved, less cold-producing medium can be adopted to obtain the good coefficient of heat transfer simultaneously, further raising unit performance, the cold-producing medium adjustable range of handpiece Water Chilling Units 100 is wide simultaneously, and unit operation requires to regulate smooth steady.
Embodiment 2:
As shown in Figure 2, in this embodiment, distinguish with embodiment 1 and be: compressor 1 also has gas supplementing opening c, and handpiece Water Chilling Units 100 also comprises economizer 5.As shown in Figure 2, economizer 5 comprises heat exchange module 51 and the second throttling arrangement 50.
Economizer 5 has the first coolant channel and the second refrigerant passage of mutual heat exchange, and the first coolant channel and second refrigerant passage limit the heat exchange module 51 of economizer 5.As shown in Figure 2, the flow direction of the first coolant channel is P4 to P1, and the flow direction of second refrigerant passage is P2 to P3.
The entrance of the first coolant channel is connected with the first end of the second throttling arrangement 50, the outlet of the first coolant channel is connected with gas supplementing opening c, second end of the second throttling arrangement 50 is connected with the second end of condenser 2, and the two ends of second refrigerant passage are connected with the second end of first throttle device 4 with the second end of condenser 2 respectively.That is, be drained into after the reducing pressure by regulating flow of the second throttling arrangement 50 first coolant channel from a part for the cold-producing medium of condenser 2 discharge, directly be drained into second refrigerant passage from another part of the cold-producing medium of condenser 2 discharge, therefore the cold-producing medium in the first coolant channel can carry out heat exchange with the cold-producing medium in second refrigerant passage, and the cold-producing medium in the first coolant channel after heat exchange is expelled back into compressor 1 from gas supplementing opening c and carries out secondary tonifying Qi.
Cold-producing medium in second refrigerant passage after heat exchange is drained in first throttle device 4 and carries out reducing pressure by regulating flow, is drained into evaporimeter 3 carries out evaporation endothermic from the cold-producing medium of first throttle device 4 discharge.Thus by being provided with economizer 5, the efficiency of compressor a kind of refrigeration cycle can be improved, improve refrigerating capacity, reduce the delivery temperature of compressor 1.
As shown in Figure 2, can be in series with between first coolant channel and gas supplementing opening c as the gauge tap such as stop valve or magnetic valve, gauge tap has to be opened or closed condition, gauge tap is connected to control its duty by control device with control device, thus can determine whether to carry out tonifying Qi to compressor 1 according to actual conditions.
Second throttling arrangement 50 is electric expansion valve, and control device is connected with the second throttling arrangement 50 aperture controlling the second throttling arrangement 50.Thus accurately control to cover overheated gas to compressor 1 secondary by electric expansion valve 50, thus improve unit performance and reliability.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this description or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (7)
1. a handpiece Water Chilling Units, is characterized in that, comprising:
Compressor, described compressor is centrifugal magnetic suspension compressor, and described compressor has exhaust outlet and gas returning port;
Condenser, the first end of described condenser is connected with described exhaust outlet;
Evaporimeter, described evaporimeter is falling film type case tube heat exchanger, and described evaporimeter has refrigerant inlet and refrigerant outlet, and described refrigerant outlet is connected with described gas returning port;
First throttle device, the first end of described first throttle device is connected with described refrigerant inlet, and the second end of described first throttle device is connected with the second end of described condenser;
Control device, described control device is connected with described first throttle device the duty controlling described compressor and described first throttle device with described compressor.
2. handpiece Water Chilling Units according to claim 1, it is characterized in that, described compressor has gas supplementing opening, described handpiece Water Chilling Units also comprises economizer, described economizer has the first coolant channel and the second refrigerant passage of mutual heat exchange, the entrance of described first coolant channel is connected with the first end of the second throttling arrangement, the outlet of described first coolant channel is connected with described gas supplementing opening, second end of described second throttling arrangement is connected with the second end of described condenser, the two ends of described second refrigerant passage are connected with the second end of described first throttle device with the second end of described condenser respectively.
3. handpiece Water Chilling Units according to claim 1, is characterized in that, described first throttle device is electric expansion valve.
4. handpiece Water Chilling Units according to claim 2, is characterized in that, described second throttling arrangement is electric expansion valve, and described control device is connected with described second throttling arrangement the aperture controlling described second throttling arrangement.
5. handpiece Water Chilling Units according to claim 1, it is characterized in that, also comprising the cooling flowing path for cooling the motor of described compressor, described cooling flowing path being in series with the 3rd throttling arrangement and control valve, one end of described cooling flowing path is connected with the second end of described condenser.
6. the handpiece Water Chilling Units according to any one of claim 1-5, it is characterized in that, also comprise the liquid level sensor for detecting described liquid level in evaporator, described liquid level sensor is connected with described control device, and described control device controls the aperture of described first throttle device according to the testing result of described liquid level sensor.
7. handpiece Water Chilling Units according to claim 1, is characterized in that, described condenser is finned heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510963910.4A CN105466056A (en) | 2015-12-21 | 2015-12-21 | Water chilling unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510963910.4A CN105466056A (en) | 2015-12-21 | 2015-12-21 | Water chilling unit |
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| CN201510963910.4A Pending CN105466056A (en) | 2015-12-21 | 2015-12-21 | Water chilling unit |
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Cited By (7)
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| CN106817885A (en) * | 2017-03-20 | 2017-06-09 | 南方电网科学研究院有限责任公司 | The hybrid outer cooling system and cooling system of a kind of converter valve |
| CN109631377A (en) * | 2018-11-21 | 2019-04-16 | 青岛海尔空调电子有限公司 | Evaporation cooling type cold water set heat exchange system and its control method |
| CN109668354A (en) * | 2019-02-12 | 2019-04-23 | 珠海格力电器股份有限公司 | The coolant circulating system and its control method that anti-compressor gas bearing is worn |
| CN110661379A (en) * | 2019-10-24 | 2020-01-07 | 南京工程学院 | Cooling and heat dissipating device of wet motor |
| CN112212531A (en) * | 2020-08-31 | 2021-01-12 | 青岛海尔空调电子有限公司 | Compressor cooling system and cooling method |
| CN112283988A (en) * | 2020-10-20 | 2021-01-29 | 广东申菱环境系统股份有限公司 | Evaporative cooling type water chilling unit and control method thereof |
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Application publication date: 20160406 |