CN207487169U - Composite refrigeration system - Google Patents
Composite refrigeration system Download PDFInfo
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- CN207487169U CN207487169U CN201721435230.6U CN201721435230U CN207487169U CN 207487169 U CN207487169 U CN 207487169U CN 201721435230 U CN201721435230 U CN 201721435230U CN 207487169 U CN207487169 U CN 207487169U
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Abstract
The utility model belongs to refrigeration technology field, specifically discloses a kind of material to refrigerant and equipment composite refrigeration system of less demanding.The composite refrigeration system, including gas compressor, cooler, gas drying apparatus, throttling set, water evaporation for cooling device and heat exchanger；The steam drain of gas compressor is connected with the air intake of cooler, the venthole of cooler is connected with the air intake of gas drying apparatus, the gas outlet of gas drying apparatus is connected with the air inlet of throttling set, the gas outlet of throttling set is connected with the dry gas import on water evaporation for cooling device, and the chilled water outlet on water evaporation for cooling device is connected with the cooling medium inlet of heat exchanger.The composite refrigeration system is of less demanding to working media and refrigerant, and its be using refrigerant and working media carry out it is damp and hot exchange refrigeration, for the of less demanding of leakproofness, pressure is not also high in system, therefore also to ask not high to the material of equipment.
Description
Technical field
The utility model belongs to refrigeration technology field, and in particular to a kind of composite refrigeration system.
Background technology
At present, existing refrigeration system mainly includes four compressor, evaporator, condenser and throttling set basic portion
Part, this four components recycle the refrigerant circulation of connection formation by pipeline.Compressor is sucked by air intake duct out of evaporator
The gaseous refrigerant of low-temp low-pressure, gaseous refrigerant pass through exhaust pipe after the gaseous refrigerant of compressor boil down to high temperature and pressure
Into condenser, the gaseous refrigerant of high temperature and pressure carries out heat exchange with cooling medium (water or air etc.) within the condenser, cold
The liquid refrigerant for cryogenic high pressure is coagulated, liquid refrigerant is through liquid refrigerant of the throttling set expansion throttling for low-temp low-pressure
Afterwards, it is again introduced into absorb heat to be evaporated to the gaseous refrigerant of low-temp low-pressure and enter in compressor in evaporator and carries out subsequent cycle,
Using the principle of liquid refrigerant evaporation endothermic so as to achieve the purpose that circularly cooling.
In existing refrigeration system, refrigerant needs such by " evaporation → compression → condensation → throttling → evaporation "
Cyclic process；As it can be seen that existing refrigeration system is to the more demanding of used refrigerant, and whole system internal pressure is very
Height is it is necessary to have good leakproofness, therefore, production cost height also higher for the material requirement of parts and components.
Utility model content
It answers the technical problem to be solved by the present invention is to provide a kind of material to refrigerant and equipment is of less demanding
Close refrigeration system.
Technical solution is used by the utility model solves its technical problem：Composite refrigeration system, including gas compression
Machine, cooler, gas drying apparatus, throttling set, water evaporation for cooling device and heat exchanger；
Cavity volume coexists in the gas-liquid that is internally provided with of the water evaporation for cooling device, and water evaporation for cooling device is equipped with and is total to respectively with gas-liquid
Deposit dry gas import, moistening gas vent and chilled water outlet that cavity volume communicates；
The steam drain of the gas compressor is connected with the air intake of cooler, and venthole and the gas of the cooler are done
The air intake of dry equipment is connected, and the gas outlet of the gas drying apparatus is connected with the air inlet of throttling set, the throttling dress
The gas outlet put is connected with the dry gas import on water evaporation for cooling device, the chilled water outlet on the water evaporation for cooling device with
The cooling medium inlet of heat exchanger is connected.
Further, the cooler is air cooler or water cooler, the throttling set is expanding machine, expansion valve, section
Flow valve or capillary.
Further, the water supply pipe that cavity volume coexists and communicates with gas-liquid is additionally provided on the water evaporation for cooling device.
Further, the blowdown pipe that cavity volume coexists and communicates with gas-liquid is additionally provided on the water evaporation for cooling device.
Further, the composite refrigeration system further includes refrigerating medium conveying apparatus, the refrigerating medium conveying apparatus
Outlet be connected with the heat exchange entrance of heat exchanger.
Further, the gas drying apparatus includes liquid water separator and gaseous state separator；
The venthole of the cooler is connected with the air intake of liquid water separator, the gas outlet of the liquid water separator
It is connected with the air inlet of gaseous state separator, the gas outlet of the gaseous state separator is connected with the air inlet of throttling set；
The liquid water separator can separate the liquid water entered in the working media in it；
The gaseous state separator can separate the vapor entered in the working media in it.
Further, the liquid water separator and gaseous state separator are nano-film filtration device.
Further, the composite refrigeration system further includes vapor cooler and water collector, the water evaporation for cooling device
On be additionally provided with the coolant intake that cavity volume coexists and communicates with gas-liquid；
The discharge outlet of the liquid water separator is connected with the water inlet of water collector, the vapor of the gaseous state separator
Outlet is connected with the air inlet of vapor cooler, the water outlet of the vapor cooler and the water inlet phase of water collector
Even, the water outlet of the water collector is connected with the coolant intake on water evaporation for cooling device.
Further, the moistening gas vent on the water evaporation for cooling device is connected with the air entry of gas compressor.
Further, the composite refrigeration system further includes water circulating pump；
The cooling media outlet of the heat exchanger is connected with the water inlet of water circulating pump, the water outlet of the water circulating pump with
The water inlet of water collector is connected.
The beneficial effects of the utility model are：The composite refrigeration system is in the medium requirements used of course of work needs
It is not high, air, nitrogen etc. can be used as working media, water, brine, organic compound aqueous solution etc. can be used and be situated between as refrigeration
In addition matter can be used air, nitrogen gas and water, brine, organic compound aqueous solution etc. and be used as refrigerating medium；The working media of normality
Then enter cooler through gas compressor sucking and boil down to high-temperature high-pressure state, the working media of high temperature and pressure is in cooler
The working media that middle progress heat exchange is cooled to cryogenic high pressure state then enters gas drying apparatus, is done through gas drying apparatus
Cryogenic high pressure working media after dry enters the drying working media that expansion throttling in throttling set is low temperature, finally
Cavity volume coexists in the gas-liquid that the drying working media of low temperature enters water evaporation for cooling device, which coexists in cavity volume in advance
Equipped with as the water of refrigerant, brine or organic compound aqueous solution etc., the drying working media of water and low temperature
Between can carry out hot and humid area, i.e., sub-fraction water evaporation is absorbed heat, so as to which rest part water becomes low temperature cold because losing heat
Freeze water, low temperature chilled water is by carrying out heat exchange refrigeration in the chilled water outlet inflow heat exchanger on water evaporation for cooling device, and because water steams
The working media for becoming moistening after hair is discharged from the moistening gas vent on water evaporation for cooling device；In entire process of refrigerastion, this is multiple
Refrigeration system is closed for the of less demanding of leakproofness, pressure is not also high in system, therefore also to ask not high to the material of equipment, therefore
It is made using common material, the use of non-ferrous metal can be reduced, cost is relatively low；Moreover, used medium is mainly
The natural materials such as air and water, will not cause greenhouse effects and depletion of the ozone layer；In addition, because the latent heat of vaporization of water is
2500kj/kg, much larger than existing refrigerant, therefore the composite refrigeration system also has the effect of energy-saving and emission-reduction.
Description of the drawings
Fig. 1 is a kind of structure diagram of embodiment of the utility model；
Fig. 2 is the structure diagram of the another embodiment of the utility model；
In figure label for：Gas compressor 100, cooler 200, gas drying apparatus 300, liquid water separator 310, gas
It is state separator 320, vapor cooler 321, throttling set 400, water evaporation for cooling device 500, dry gas import 501, wet
Moisten gas vent 502, coolant intake 503, chilled water outlet 504, blowdown pipe 505, water supply pipe 506, water collector 520, heat exchange
Device 600, refrigerating medium conveying apparatus 700, water circulating pump 800.
Specific embodiment
The utility model will be further described below with reference to the accompanying drawings.
As shown in Figure 1, composite refrigeration system, including gas compressor 100, cooler 200, gas drying apparatus 300, section
Flow device 400, water evaporation for cooling device 500 and heat exchanger 600；
The gas-liquid that is internally provided with of water evaporation for cooling device 500 coexists cavity volume, water evaporation for cooling device 500 be equipped with respectively with gas-liquid
Dry gas import 501, moistening gas vent 502 and chilled water outlet 504 that cavity volume communicates coexists；
The steam drain of gas compressor 100 is connected with the air intake of cooler 200, the venthole and gas of cooler 200
The air intake of drying equipment 300 is connected, and the gas outlet of gas drying apparatus 300 is connected with the air inlet of throttling set 400, throttling
The gas outlet of device 400 is connected with the dry gas import 501 on water evaporation for cooling device 500, cold on water evaporation for cooling device 500
Freezing water outlet 504 is connected with the cooling medium inlet of heat exchanger 600.
Need to use three kinds of media in the composite refrigeration system process of refrigerastion, one of which is working media, working media
For gas, air, nitrogen etc. usually can be used as working media；Another kind is refrigerant, and refrigerant is needed with energy
Enough and low temperature drying working media carries out the ability of hot and humid area, generally use water, brine, organic compound water
Solution etc. is used as refrigerant, and the gas-liquid that refrigerant is generally seated in water evaporation for cooling device is coexisted in cavity volume；In addition in heat exchanger
600 carry out the refrigerating medium of heat exchange with extraneous or user, and air, nitrogen gas and water, brine, organic compound water usually can be selected
Solution etc..
Gas compressor 100 is mainly used for working media boil down to high-temperature high-pressure state, and it is sent by steam drain
In cooler 200；Gas compressor 100 directly can be used as working media by air entry from ambient inlet air, if from the external world
Suck air, it usually needs air filter is set on the air entry of gas compressor 100, and filtering enters gas compressor
100 air；Gas compressor 100 can also pass through air entry and 502 phase of moistening gas vent on water evaporation for cooling device 500
Even, it is coexisted from the gas-liquid of water evaporation for cooling device 500 and the working media of moistening is sucked in cavity volume is recycled.
Cooler 200 is mainly used for that the working media of high temperature and pressure is made to carry out heat exchange with water or air, is allowed to be cooled to
Environment temperature becomes the working media of cryogenic high pressure state；Cooler 200 is preferably air cooler or water cooler.
Gas drying apparatus 300 is mainly used for removing the water and steam in working media, can be a variety of, such as：
Drying device of the inside equipped with solid or liquid drier, in another example：Inside is equipped with the physical dryness device of filter membrane.
It is low temperature that throttling set 400, which is mainly used for the throttling of dried cryogenic high pressure expanding working medium,
Dry working media carries out hot and humid area in order to drying working media and the refrigerant of low temperature.Throttling set
400 be preferably expanding machine, expansion valve, throttle valve or capillary etc..
Water evaporation for cooling device 500 is mainly used for the drying working media of low temperature and refrigerant carries out the wet friendship of heat
It changes, to reduce the temperature of refrigerant；The main body of water evaporation for cooling device 500 is usually a storage container, can be with open type
Or it is closed, of course for ensure refrigerant exchange effect, water evaporation system with the hot and humid area of working media
The main body of cooler 500 is preferably hermetically sealed container；In order to ensure that the refrigerant abundance in cavity volume coexists in gas-liquid, in water evaporation system
The water supply pipe 506 that cavity volume coexists and communicates with gas-liquid is typically provided on cooler 500, is situated between supplement refrigeration in cavity volume coexists to gas-liquid
Matter；The solenoid valve being electrically connected with control system can also be usually set on water supply pipe 506, and in cavity volume coexists in gas-liquid setting with
The liquid level detector of control system electrical connection, the amount that refrigerant in cavity volume coexists in gas-liquid is detected by liquid level detector in real time,
Control system control solenoid valve, which is opened to coexist to gas-liquid, if less than setting liquid level is replenished in time refrigerant in cavity volume.
Heat exchanger 600 is mainly used for cryogenic refrigeration medium and carries out heat exchange into extraneous or user, so as to reach refrigeration
Purpose.
In the composite refrigeration system process of refrigerastion, the working media of normality is through the sucking of gas compressor 100 and boil down to height
Warm high pressure conditions then enter cooler 200, the working media of high temperature and pressure carried out in cooler 200 heat exchange be cooled to it is low
The working media of warm high pressure conditions then enters gas drying apparatus 300, through 300 dried cryogenic high pressure of gas drying apparatus
Working media enters the drying working media that expansion throttling in throttling set 400 is low temperature, last low-temp low-pressure shape
Cavity volume coexists in the gas-liquid that the drying working media of state enters water evaporation for cooling device 500, which, which coexists, is pre-loaded with making in cavity volume
Hot and humid area can be carried out between the drying working media of cold medium, refrigerant and low temperature, so as to become low temperature
Refrigerant, cryogenic refrigeration medium in the chilled water outlet inflow heat exchanger 600 on evaporation chiller 500 by carrying out heat exchange system
It is cold, and because the working media that hot and humid area becomes moistening is discharged from the moistening gas vent 502 on evaporation chiller 500.
The refrigeration principle of the composite refrigeration system：Gas-liquid into water evaporation for cooling device 500 coexists work in cavity volume and is situated between
Matter is the drying working media of low temperature, and in unsaturated state, therefore refrigerant has and steamed into working media
The ability of hair, and since the temperature of working media is less than the temperature of refrigerant, the heat between refrigerant and working media is wet
Exchange is refrigerant by its sensible heat transfer to working media, makes the temperature of working media have certain raising, simultaneously because refrigeration
The evaporation of medium, the water capacity of working media are continuously increased, and the evaporation into the part refrigerant in working media will be taken back
Whole latent heats of vaporization, remaining refrigerant temperature is made further to decline, and (when refrigerant is water, temperature can reach zero degree；Refrigeration
When medium is brine, organic compound aqueous solution, temperature can reach subzero), and then obtain required cryogenic refrigeration of freezing
Medium enters cryogenic refrigeration medium and heat exchange refrigeration is carried out in heat exchanger 600, so as to fulfill refrigeration purpose.
Such as：When selecting air as working media, and selecting water as refrigerant, the wet friendship of heat between water and air
It changes, including the mass transfer between water and air and the heat transfer between water and air；From the angle of mass transfer, since molecule is made
Irregular movement when air is in direct contact with water, will form a temperature and be equal near water surface or around water droplet
The saturated air boundary layer of water temperature, the concentration (partial pressure of water vapor) of stream molecule is only dependent upon saturation sky in boundary layer at this time
Saturation air temperature in gas boundary layer；In the both sides in boundary layer, side is pending air, and as bulk air is (for area
Saturated air in other boundary layer is by air based on pending Air balance)；Opposite side is water.It is done by stream molecule
Irregular movement, often some stream molecule enters boundary layer, while may also have to the bulk air side outside boundary layer
A part of stream molecule enters bulk air side out of boundary layer；Equally understand some stream molecule and leave boundary layer and coagulate
Form water to return in water；Simultaneously can also the evaporation of some hydrone leave water and enter boundary layer.If water steams in boundary layer
(both the partial pressure of water vapor in boundary layer is more than main body sky when vapour molecular concentration is more than the stream molecule concentration of bulk air side
The partial pressure of water vapor of gas side), then the stream molecule number entered in bulk air by boundary layer is more than by bulk air side master
Body air enters the stream molecule number in boundary layer, transmits the result is that the stream molecule number in bulk air will increase, main body
The humidified purpose of air, that is, usually said " evaporation " phenomenon, this water vapour point are realized in the water capacity increase of air
The result of sub- migration.Heat transfer between water and air is the synthesis result of Exchange of apparent heat and latent heat exchange.The temperature difference is aobvious
The motive force of heat exchange, steam partial pressure force difference are the motive forces of latent heat exchange, and the motive force of total heat exchange is enthalpy difference.One side
Face because of air themperature and the difference of water temperature, just with the presence of the temperature difference, necessarily passes through heat conduction, convection current, the heat transfer side radiated between the two
Formula carries out heat transfer, is exactly Exchange of apparent heat；On the other hand, the mass exchange occurred when air is contacted with water will be inevitable adjoint
There is the evaporation of water vapor in air, so as to absorb the latent heat of vaporization.When in boundary layer air themperature (being approximately equal to water temperature) higher than master
During body air themperature, then conducted heat from boundary layer to bulk air；Conversely, it is then that into boundary layer, air conducts heat from bulk air.
Exchange of apparent heat may only be occurred according to the difference of water and the temperature difference of air, it is also possible to existing Exchange of apparent heat, and have wet exchange (quality
Exchange), and latent heat exchange will occur for carry out wet exchange while.The composite refrigeration system is by being made the dry of low temperature
Dry air carries out hot and humid area with water, reaches fabulous refrigeration effect.
For the ease of cooling heat exchange, then as shown in Figure 1, the composite refrigeration system further includes refrigerating medium conveying apparatus 700,
The outlet of refrigerating medium conveying apparatus 700 is connected with the heat exchange entrance of heat exchanger 600.Refrigerating medium conveying apparatus 700 can be with
For wind turbine, fan, pump etc..
As a kind of preferred embodiment of the utility model, as shown in Fig. 2, gas drying apparatus 300 include aqueous water from
Device 310 and gaseous state separator 320；
The venthole of cooler 200 is connected with the air intake of liquid water separator 310, the outlet of liquid water separator 310
Mouth is connected with the air inlet of gaseous state separator 320, the gas outlet of gaseous state separator 320 and the air inlet of throttling set 400
It is connected；
Liquid water separator 310 can separate the liquid water entered in the working media in it；
Gaseous state separator 320 can separate the vapor entered in the working media in it.
Wherein, the nanometer film that can filter out liquid water molecules is provided in liquid water separator 310, which only holds
Perhaps the vapor in air and air passes through, and liquid water is separated；Being provided in gaseous state separator 320 can filter out
The nanometer film of vapor, the nanometer film only allow air to pass through, and vaporous water is separated；Liquid water separator 310 and gaseous state
Separator 320 is both preferably nano-film filtration device.The liquid water and steam being isolated by filtration out is conducive to the progress of moisture
It utilizes, it is cost-effective.
On the basis of the above, in order to the liquid filtered to isolate water and steam is made full use of, then as shown in Fig. 2, should
Composite refrigeration system further includes vapor cooler 321 and water collector 520, is additionally provided on water evaporation for cooling device 500 and is total to gas-liquid
Deposit the coolant intake 503 that cavity volume communicates；
The discharge outlet of liquid water separator 310 is connected with the water inlet of water collector 520, and the water of gaseous state separator 320 steams
Gas outlet is connected with the air inlet of vapor cooler 321, the water outlet of vapor cooler 321 and water collector 520 into
The mouth of a river is connected, and the water outlet of water collector 520 is connected with the coolant intake 503 on water evaporation for cooling device 500.
In order to recycle the working media in the composite refrigeration system, by the moistening gas on water evaporation for cooling device 500
Body outlet 502 is connected with the air entry of gas compressor 100.In order to the supplement loss into the working media cycle being linked to be
Working media is usually additionally provided with the blowdown pipe 505 that cavity volume coexists and communicates with gas-liquid on water evaporation for cooling device 500.Blowdown pipe 505
On be typically provided with solenoid valve, be closed under the solenoid valve normal condition；It is typically provided on the end of blowdown pipe 505
Aerating pumps.
In order to recycle the refrigerant in the composite refrigeration system, with cost-effective, then as shown in Fig. 2, this is multiple
It closes refrigeration system and further includes water circulating pump 800；
The cooling media outlet of heat exchanger 600 is connected with the water inlet of water circulating pump 800, the water outlet of water circulating pump 800
It is connected with the water inlet of water collector 520.It can will cool down what media outlet flowed out from heat exchanger 600 by water circulating pump 800
Refrigerant is sent into water collector 520 after heat exchange, to provide refrigerant into water evaporation for cooling device 500.
Claims (10)
1. composite refrigeration system, it is characterised in that：Including gas compressor (100), cooler (200), gas drying apparatus
(300), throttling set (400), water evaporation for cooling device (500) and heat exchanger (600)；
The gas-liquid that is internally provided with of the water evaporation for cooling device (500) coexists cavity volume, water evaporation for cooling device (500) be equipped with respectively with
Dry gas import (501), moistening gas vent (502) and the chilled water outlet (504) that cavity volume communicates coexists in gas-liquid；
The steam drain of the gas compressor (100) is connected with the air intake of cooler (200), and cooler (200) go out
Steam ports is connected with the air intake of gas drying apparatus (300), the gas outlet of the gas drying apparatus (300) and throttling set
(400) air inlet is connected, the gas outlet of the throttling set (400) and the dry gas on water evaporation for cooling device (500) into
Mouth (501) is connected, and chilled water outlet (504) and the cooling medium of heat exchanger (600) on the water evaporation for cooling device (500) enter
Mouth is connected.
2. composite refrigeration system as described in claim 1, it is characterised in that：The cooler (200) is air cooler or water cooling
Device, the throttling set (400) are expanding machine, expansion valve, throttle valve or capillary.
3. composite refrigeration system as described in claim 1, it is characterised in that：It is additionally provided on the water evaporation for cooling device (500)
The water supply pipe (506) that cavity volume communicates coexists with gas-liquid.
4. composite refrigeration system as claimed in claim 3, it is characterised in that：It is additionally provided on the water evaporation for cooling device (500)
The blowdown pipe (505) that cavity volume communicates coexists with gas-liquid.
5. composite refrigeration system as described in claim 1, it is characterised in that：Further include refrigerating medium conveying apparatus (700), institute
The outlet for stating refrigerating medium conveying apparatus (700) is connected with the heat exchange entrance of heat exchanger (600).
6. the composite refrigeration system as described in claim 1,2,3,4 or 5, it is characterised in that：The gas drying apparatus (300)
Including liquid water separator (310) and gaseous state separator (320)；
The venthole of the cooler (200) is connected with the air intake of liquid water separator (310), the liquid water separator
(310) gas outlet is connected with the air inlet of gaseous state separator (320), the gas outlet of the gaseous state separator (320) with
The air inlet of throttling set (400) is connected；
The liquid water separator (310) can separate the liquid water entered in the working media in it；
The gaseous state separator (320) can separate the vapor entered in the working media in it.
7. composite refrigeration system as claimed in claim 6, it is characterised in that：The liquid water separator (310) and vaporous water
Separator (320) is nano-film filtration device.
8. composite refrigeration system as claimed in claim 6, it is characterised in that：It further includes vapor cooler (321) and catchments
Device (520) is additionally provided with the coolant intake (503) that cavity volume coexists and communicates with gas-liquid on the water evaporation for cooling device (500)；
The discharge outlet of the liquid water separator (310) is connected with the water inlet of water collector (520), the gaseous state separator
(320) vapor outlet is connected with the air inlet of vapor cooler (321), and vapor cooler (321) go out
The mouth of a river is connected with the water inlet of water collector (520), on the water outlet of the water collector (520) and water evaporation for cooling device (500)
Coolant intake (503) is connected.
9. composite refrigeration system as claimed in claim 8, it is characterised in that：Moistening on the water evaporation for cooling device (500)
Gas vent (502) is connected with the air entry of gas compressor (100).
10. composite refrigeration system as claimed in claim 9, it is characterised in that：Further include water circulating pump (800)；
The cooling media outlet of the heat exchanger (600) is connected with the water inlet of water circulating pump (800), the water circulating pump
(800) water outlet is connected with the water inlet of water collector (520).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721435230.6U CN207487169U (en) | 2017-10-31 | 2017-10-31 | Composite refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721435230.6U CN207487169U (en) | 2017-10-31 | 2017-10-31 | Composite refrigeration system |
Publications (1)
| Publication Number | Publication Date |
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| CN207487169U true CN207487169U (en) | 2018-06-12 |
Family
ID=62478758
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721435230.6U Withdrawn - After Issue CN207487169U (en) | 2017-10-31 | 2017-10-31 | Composite refrigeration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107606812A (en) * | 2017-10-31 | 2018-01-19 | 沈志宏 | Composite refrigeration system |
-
2017
- 2017-10-31 CN CN201721435230.6U patent/CN207487169U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107606812A (en) * | 2017-10-31 | 2018-01-19 | 沈志宏 | Composite refrigeration system |
| CN107606812B (en) * | 2017-10-31 | 2023-05-02 | 沈志宏 | Composite refrigeration system |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180612 Effective date of abandoning: 20230502 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180612 Effective date of abandoning: 20230502 |