CN106642866A - High-temperature snow making method utilizing low-temperature gas for forming ice nucleuses - Google Patents
High-temperature snow making method utilizing low-temperature gas for forming ice nucleuses Download PDFInfo
- Publication number
- CN106642866A CN106642866A CN201611144273.9A CN201611144273A CN106642866A CN 106642866 A CN106642866 A CN 106642866A CN 201611144273 A CN201611144273 A CN 201611144273A CN 106642866 A CN106642866 A CN 106642866A
- Authority
- CN
- China
- Prior art keywords
- temperature
- cryogenic gas
- ice
- gas
- snow making
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C3/00—Processes or apparatus specially adapted for producing ice or snow for winter sports or similar recreational purposes, e.g. for sporting installations; Producing artificial snow
- F25C3/04—Processes or apparatus specially adapted for producing ice or snow for winter sports or similar recreational purposes, e.g. for sporting installations; Producing artificial snow for sledging or ski trails; Producing artificial snow
-
- 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
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2303/00—Special arrangements or features for producing ice or snow for winter sports or similar recreational purposes, e.g. for sporting installations; Special arrangements or features for producing artificial snow
- F25C2303/042—Snow making by using solid ice, e.g. ice crushing
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a high-temperature snow making method utilizing low-temperature gas for forming ice nucleuses. According to the method, a snow making machine forming the ice nucleuses through the low-temperature gas is utilized for snow making under the high-temperature condition, and the low-temperature gas includes N2 low-temperature gas and CO2 low-temperature gas. A head of the snow making machine used in the method comprises multiple nucleon devices and multiple atomizers. Each nucleon device comprises a water inlet pipeline and a gas inlet pipeline, wherein the low-temperature gas enters from the gas inlet pipeline. According to the method, the low-temperature gas enters artificial snow making equipment from the gas inlet pipelines of the nucleon devices, a traditional manner that air of the nature is compressed and enters nucleon devices for snow making is replaced, meanwhile, optimization design is conducted on the nucleon devices and the atomizers, the snow making equipment can achieve the snow making function at the temperature of -2 DEG C, and indoor ski fields of high-temperature areas of Chinese mainland parts become possible.
Description
Technical field
The invention belongs to snowmaking technique field, and in particular to a kind of utilization cryogenic gas forms the high temperature artificial snow-making of ice-nucleus
Method.
Background technology
In recent years, people greatly increase the degree of having deep love for of skiing and snow carving art, particularly in July, 2015
41, Beijing was combined Zhangjiakou and successfully obtains Winter Olympic Games hosting right in 2022, promoted 1,300,000,000 Chinese to join in ice by different way
Snow motion and related industry, and new contribution will be made for Health China, the international Olympic Movement.In these years, Beijing skiing
Motion flourishes, and plans by 2022, and Beijing's ice and snow sports industry total value reaches 40,000,000,000；Each area will build an ice face
Ice rink no less than 1800 square metres；Beijing will possess 36 indoor rinks and 50 outdoor ice rinks.
How so many indoor and outdoor ice rinks can provide the problem of the snowfall of abundance is arisen spontaneously, and relies solely on winter
Nature give lectures and can not meet actual demand.In order to meet people to skiing and the pursuit of snow carving, it is necessary to find one
Tackling the uncertain problem of northern nature snowfall, best bet is exactly artificial snow to individual method, and snowmaker is people
The capital equipment of work artificial snow-making.
The operation principle of snowmaker substantially imitates the forming process of natural snow.There is compressor first nature
Air compression and the pressure-air of generation is sent to into nucleon device nozzle, pressure-air and water under high pressure mix in nucleon device after Jing
Nucleon device nozzle sprays and produces seed snow core；The small water droplet that simultaneously light water is formed Jing after atomizer ejection is by fan motor
Cast aerial, uniformly scatter；Required for us will be formed after seed snow core is combined with small water smoke in projecting process
Snow grain.
Major part can only could realize artificial snow-making at subzero 6 DEG C or so in current snowmaker, artificial snow-making it is relatively costly,
And all it is to be compressed using the air of nature, it is more harsh to the temperature requirement of nature so that the high temperature area on interior ground
Outdoor snow pack or snow dome be forced to delay the business hours, or even high temperature area in part can not possibly open up indoor skiing
, it is impossible to vast Ski amateur is preferably met to skiing demand, while also resulting in larger economic loss.
The content of the invention
In order to overcome the shortcomings of described in background technology, the present invention provides the high temperature that a kind of utilization cryogenic gas forms ice-nucleus
The method of artificial snow-making, the method is to be compressed cryogenic gas and admission line from nucleon device enters into device for making artificial snow
In, instead of the air of conventionally employed nature carries out artificial snow-making, while being optimized design to nucleon device and atomizer so that make
Snow equipment is capable of achieving artificial snow-making function at subzero 2 DEG C.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of method that utilization cryogenic gas forms the high temperature artificial snow-making of ice-nucleus, i.e., the snowmaker for forming ice-nucleus using cryogenic gas exists
Artificial snow-making is carried out under hot conditions, the air that instead of conventionally employed nature is compressed into and carry out in nucleon device artificial snow-making, applied
People, when the gas compression artificial snow-making using nature, can only could realize making through field demonstration at subzero 6 DEG C or so
Snow, after present invention employs cryogenic gas, can be increased to subzero 2 DEG C or so, greatly by the condition of artificial snow-making by subzero 6 DEG C or so
Improve the temperature of artificial snow-making so that interior ground high temperature area interior snow pack becomes possible to.
Preferably, the head of the snowmaker that described method is used includes several nucleon devices and several atomizers；Core
Sub- device includes inlet channel and admission line, and cryogenic gas is entered from admission line, and cryogenic gas need not compress, and instead of
Traditional air is through compressing into nucleon device；Water is after pressurization through inlet channel entrance, cryogenic gas and water under high pressure
Jing nucleon devices nozzle sprays and produces seed snow core after mixing in nucleon device.
Preferably, described nucleon device is disposed with admission line, hybrid chamber, core diameter and nozzle along gas direction of advance
Passage；Described admission line includes a jet orifice plate, and multiple small through holes are provided with jet orifice plate, and cryogenic gas is by logical
Hole is input into into hybrid chamber, due to being provided with multiple small through holes so that cryogenic gas is injected in hybrid chamber in spurting,
Ensure that cryogenic gas is sufficiently well mixed in hybrid chamber with water under high pressure；Described hybrid chamber be cylindrical structure, hybrid chamber
Length it is longer, extend the incorporation time of water under high pressure and cryogenic gas so that water under high pressure and cryogenic gas are sufficiently well mixed；
Inlet channel is connected with hybrid chamber, water under high pressure is input into by inlet channel, hybrid chamber end is inwardly contracted to core diameter, by core
Footpath sprays water under high pressure and high pressure gas mixture；Described nozzle passage is expanded outwardly as horn-like structure from core diameter end,
The sectional area of nozzle passage outlet is 1.5 with the ratio of the sectional area of hybrid chamber cylindrical structure：1；Described inlet channel is along water
Flow direction is divided into first, second, and third section, and the first section is inwardly contracted to the second section, and the second section is cylinder knot
Structure, the second segment ends connect the 3rd section, and the 3rd section is the horn-like structure for expanding outwardly, and the 3rd segment ends are connected to
Hybrid chamber.In the nucleon device course of work, the input of cryogenic gas Jing admission lines, pressure of the water in 50 bars to 60 bars（Absolute gas
Pressure）Lower Jing inlet channels are entered in hybrid chamber, under above-mentioned pressure, in nozzle passage outlet about 0.6 to 1.9 air are obtained
With the quality stream ratio of water, optimal ice-nucleus shaping is realized.
Preferably, described atomizer includes reservoir, wears reservoir and is provided with a ultrasonic vibrating unit, liquid storage
Groove upper end is provided with cover plate, and cover plate middle position is provided with spray nozzle sheet, and multiple small holes, spray nozzle sheet are provided with spray nozzle sheet
Bottom is corresponding with the top of ultrasonic vibrating unit, and the distance between reservoir bottom and top of ultrasonic vibrating unit are
0.2 ~ 0.4mm, ultrasonic vibrating unit is used to produce dither, and ultrasonic vibrating unit props up spray nozzle sheet and carries out dither
When, the liquid at the top of ultrasonic vibrating unit can be become by spray nozzle sheet and nebulize, ultrasonic vibrating unit top and reservoir
Internal distance from bottom is near, therefore the liquid inside reservoir can be defeated along the side wall of ultrasonic vibrating unit by adhesive force
Ultrasonic vibrating unit top is delivered to, the liquid at the top of ultrasonic vibrating unit is become when nebulizing by spray nozzle sheet, liquid storage
The liquid of trench bottom can be transported to again therewith ultrasonic vibrating unit top, relative to existing technology, eliminate liquid
Structure for conveying, solves the problems, such as normally convey liquid sometimes.
Preferably, described cryogenic gas includes N2And CO2Cryogenic gas.
It is an advantage of the invention that：
（1）The method that cryogenic gas of the present invention forms the high temperature artificial snow-making of ice-nucleus, it is simple to operate in specific implementation process,
The temperature of artificial snow-making can be improved to subzero 2 DEG C or so by subzero 6 DEG C or so, increase substantially artificial snow-making temperature, be realized subzero 2
DEG C " high temperature " under the conditions of carry out the function of artificial snow-making；
（2）The present invention is optimized design to the structure of atomizer and nucleon device, realizes optimal ice-nucleus shaping, solves atomizer
The deficiency of liquid can not be conveyed；
（3）The present invention is used to meet vast skiing so that indoor or outdoors skifield puies forward the open business of the last fortnight or so
The demand of fan, reduces the economic loss that dealer is sought in skifield；
（4）The present invention opens up snow dome and is possibly realized for interior ground part high temperature area.
Description of the drawings
Fig. 1 is the sectional view of the artificial snow-making chain-drive section of the present invention；
Fig. 2 is the structural representation of the nucleon device of the present invention；
Fig. 3 is the structure diagram of the nucleon device inlet channel of the present invention；
Fig. 4 is the structural representation of the atomizer of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated：
In order to improve artificial snow-making temperature, applicant goes out a kind of high temperature of utilization cryogenic gas formation ice-nucleus and makes through lot of experiments
The method of snow, methods described forms ice-nucleus and carries out artificial snow-making in nucleon device using cryogenic gas with water, the cryogenic gas for being used
Including N2And CO2Cryogenic gas.
As shown in figure 1, the head of snowmaker that described method is used include several nucleon devices 11 and several be atomized
Device 12；Nucleon device 11 includes inlet channel 13 and admission line 14, and cryogenic gas is entered from admission line 14, cryogenic gas and
The nozzle of Jing nucleons device 11 sprays generation seed snow core after water under high pressure mixes in nucleon device 11.
As shown in Fig. 2 in order that nucleon device in the course of the work, it is ensured that cryogenic gas sufficiently mixes with water under high pressure
It is even, optimal ice-nucleus shaping can be realized, described nucleon device is disposed with admission line 21, hybrid chamber along gas direction of advance
22nd, core diameter 23 and nozzle passage 24；Described admission line 21 includes a jet orifice plate, is provided with jet orifice plate multiple small
Through hole；Described hybrid chamber 22 is cylindrical structure, and inlet channel 25 is connected with hybrid chamber 22, and the end of hybrid chamber 22 is inwardly received
It is reduced to core diameter 23；Described nozzle passage 24 is expanded outwardly as horn-like structure from the end of core diameter 23, the outlet of nozzle passage 24
Sectional area is 1.5 with the ratio of the sectional area of the cylindrical structure of hybrid chamber 22：1.
As shown in figure 3, in order that water under high pressure has the longer time of staying during input, it is allowed to the water being input into
There is time enough to cool down, described inlet channel is divided into first, second, and third section, the first section 36 along water flow direction
Inwardly it is contracted to the second section 37, the second section 37 is cylindrical structure, the end of the second section 37 connects the 3rd section 38, the 3rd
Section 38 is the horn-like structure for expanding outwardly, and the end of the 3rd section 38 is connected to hybrid chamber.
As shown in figure 4, in order to save the liquid carrying structure inside atomizer, solving and cannot normally convey sometimes liquid
Problem, described atomizer includes reservoir 41, wears reservoir 41 and be provided with a ultrasonic vibrating unit 42, reservoir
41 upper ends are provided with cover plate 43, and the middle position of cover plate 43 is provided with spray nozzle sheet 44, and multiple small holes are provided with spray nozzle sheet 44
Hole, the bottom of reservoir 41 is corresponding with the top of ultrasonic vibrating unit 42, and ultrasonic vibrating unit 42 is used to produce high frequency vibrating
Dynamic, ultrasonic vibrating unit 42 props up spray nozzle sheet 44 when carrying out dither, and the liquid at the top of ultrasonic vibrating unit 42 can lead to
Cross spray nozzle sheet 44 and become and nebulize, the top of ultrasonic vibrating unit 42 is near with the distance from bottom inside reservoir 41, is 0.3mm,
Therefore the liquid inside reservoir 41 can be delivered to ultrasonic wave shake by adhesive force along the side wall of ultrasonic vibrating unit 42
The top of dynamic device 42, when the liquid at the top of ultrasonic vibrating unit 42 is become by spray nozzle sheet 44 to nebulize, the bottom of reservoir 41
The liquid in portion can again be transported to therewith the top of ultrasonic vibrating unit 42, realize continuous conveying.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and and
The non-restriction to embodiment.For those of ordinary skill in the field, can also do on the basis of the above description
Go out the change or variation of other multi-forms.There is no need to be exhaustive to all of embodiment.And thus drawn
Obvious change that Shen goes out or among changing still in protection scope of the present invention.
Claims (5)
1. a kind of method that utilization cryogenic gas forms the high temperature artificial snow-making of ice-nucleus, it is characterised in that methods described adopts low temperature gas
Body forms the snowmaker of ice-nucleus and carries out artificial snow-making under the high temperature conditions.
2. the method that a kind of utilization cryogenic gas as claimed in claim 1 forms the high temperature artificial snow-making of ice-nucleus, it is characterised in that institute
The head of the snowmaker that the method stated is used includes several nucleon devices and several atomizers；Nucleon device include inlet channel and
Admission line, cryogenic gas is entered from admission line.
3. the method that a kind of utilization cryogenic gas as claimed in claim 2 forms the high temperature artificial snow-making of ice-nucleus, it is characterised in that institute
The nucleon device stated is disposed with admission line, hybrid chamber, core diameter and nozzle passage along gas direction of advance；Described air inlet pipe
Road includes a jet orifice plate, and multiple small through holes are provided with jet orifice plate；Described hybrid chamber be cylindrical structure, hybrid chamber
On be connected with inlet channel, hybrid chamber end is inwardly contracted to core diameter；Described nozzle passage from core diameter end expand outwardly for
Horn-like structure, the sectional area of nozzle passage outlet is 1.5 with the ratio of the sectional area of hybrid chamber cylindrical structure：1；Described enters
Waterpipe is divided into first, second, and third section along water flow direction, and the first section is inwardly contracted to the second section, the second section
For cylindrical structure, the second segment ends connect the 3rd section, and the 3rd section is the horn-like structure for expanding outwardly, the 3rd section
End is connected to hybrid chamber.
4. the method that a kind of utilization cryogenic gas as claimed in claim 3 forms the high temperature artificial snow-making of ice-nucleus, it is characterised in that institute
The atomizer stated includes reservoir, wears reservoir and is provided with a ultrasonic vibrating unit, and reservoir upper end is provided with cover plate,
Cover plate middle position is provided with spray nozzle sheet, and multiple small holes, spray nozzle sheet bottom and vibration of ultrasonic wave are provided with spray nozzle sheet
The top of device is corresponding, and the distance between top of reservoir bottom and ultrasonic vibrating unit is 0.2 ~ 0.4mm.
5. the method that a kind of utilization cryogenic gas as described in any one of claim 1-4 forms the high temperature artificial snow-making of ice-nucleus, it is special
Levy and be, described cryogenic gas is N2And CO2Cryogenic gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611144273.9A CN106642866A (en) | 2016-12-13 | 2016-12-13 | High-temperature snow making method utilizing low-temperature gas for forming ice nucleuses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611144273.9A CN106642866A (en) | 2016-12-13 | 2016-12-13 | High-temperature snow making method utilizing low-temperature gas for forming ice nucleuses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106642866A true CN106642866A (en) | 2017-05-10 |
Family
ID=58825925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611144273.9A Pending CN106642866A (en) | 2016-12-13 | 2016-12-13 | High-temperature snow making method utilizing low-temperature gas for forming ice nucleuses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106642866A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107314587A (en) * | 2017-08-02 | 2017-11-03 | 北京大学 | A kind of more than 0 DEG C artificial snow system and its snow making method |
| CN107499047A (en) * | 2017-09-26 | 2017-12-22 | 北华大学 | A kind of snow deposit stacking method for 3D printing snow carving |
| CN107543347A (en) * | 2017-10-24 | 2018-01-05 | 北京宾度明德滑雪设备有限公司 | Snowmaker |
| CN107726688A (en) * | 2017-10-24 | 2018-02-23 | 北京宾度明德滑雪设备有限公司 | A kind of artificial snow-making system of snowmaker |
| CN111735246A (en) * | 2020-07-27 | 2020-10-02 | 河北师范大学 | Snowball machine for ice and snow sports items |
| CN112923623A (en) * | 2021-02-01 | 2021-06-08 | 西安交通大学 | Snow making machine with high snow making rate and control method and working method thereof |
| CN113155432A (en) * | 2021-04-28 | 2021-07-23 | 北京建筑大学 | Method for detecting atomization component of snow making machine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2421596Y (en) * | 2000-03-21 | 2001-02-28 | 上海夏雪科技有限公司 | Device for producing snow |
| CN1488904A (en) * | 2003-08-21 | 2004-04-14 | 上海交通大学 | Artificial snow-producing apparatus using natural cold-amount at atmosphere |
| CN2713402Y (en) * | 2004-07-02 | 2005-07-27 | 李子欣 | Snow creator having gas vortex tube |
| CN101965493A (en) * | 2007-12-14 | 2011-02-02 | 巴彻勒托普特拉克股份公司 | Arrangement, use of an arrangement, device, snow lance and method for producing ice nuclei and artificial snow |
| CN102671807A (en) * | 2011-03-11 | 2012-09-19 | 泰博科技股份有限公司 | Atomizer |
| CN203664046U (en) * | 2013-12-17 | 2014-06-25 | 董晨 | Anti-blocking atomizing nozzle |
-
2016
- 2016-12-13 CN CN201611144273.9A patent/CN106642866A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2421596Y (en) * | 2000-03-21 | 2001-02-28 | 上海夏雪科技有限公司 | Device for producing snow |
| CN1488904A (en) * | 2003-08-21 | 2004-04-14 | 上海交通大学 | Artificial snow-producing apparatus using natural cold-amount at atmosphere |
| CN2713402Y (en) * | 2004-07-02 | 2005-07-27 | 李子欣 | Snow creator having gas vortex tube |
| CN101965493A (en) * | 2007-12-14 | 2011-02-02 | 巴彻勒托普特拉克股份公司 | Arrangement, use of an arrangement, device, snow lance and method for producing ice nuclei and artificial snow |
| CN102671807A (en) * | 2011-03-11 | 2012-09-19 | 泰博科技股份有限公司 | Atomizer |
| CN203664046U (en) * | 2013-12-17 | 2014-06-25 | 董晨 | Anti-blocking atomizing nozzle |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107314587A (en) * | 2017-08-02 | 2017-11-03 | 北京大学 | A kind of more than 0 DEG C artificial snow system and its snow making method |
| CN107499047A (en) * | 2017-09-26 | 2017-12-22 | 北华大学 | A kind of snow deposit stacking method for 3D printing snow carving |
| CN107543347A (en) * | 2017-10-24 | 2018-01-05 | 北京宾度明德滑雪设备有限公司 | Snowmaker |
| CN107726688A (en) * | 2017-10-24 | 2018-02-23 | 北京宾度明德滑雪设备有限公司 | A kind of artificial snow-making system of snowmaker |
| CN111735246A (en) * | 2020-07-27 | 2020-10-02 | 河北师范大学 | Snowball machine for ice and snow sports items |
| CN112923623A (en) * | 2021-02-01 | 2021-06-08 | 西安交通大学 | Snow making machine with high snow making rate and control method and working method thereof |
| CN113155432A (en) * | 2021-04-28 | 2021-07-23 | 北京建筑大学 | Method for detecting atomization component of snow making machine |
| CN113155432B (en) * | 2021-04-28 | 2022-06-10 | 北京建筑大学 | Method for detecting atomization component of snow making machine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106642866A (en) | High-temperature snow making method utilizing low-temperature gas for forming ice nucleuses | |
| US3567116A (en) | Atomizing method and apparatus | |
| US6119956A (en) | Snow gun for making artificial snow | |
| CN104422222B (en) | For manufacturing the device and method of snowmaking | |
| CN101184537A (en) | A dispersion and aeration apparatus for compressed air foam systems | |
| US3952949A (en) | Method of making snow | |
| EP2972018B1 (en) | Nucleator for generating ice crystals for seeding water droplets in snow-making systems | |
| CN104930776A (en) | Novel snow maker | |
| CN107314587B (en) | Artificial snow making system and method at temperature of above 0 DEG C | |
| CN207113336U (en) | A kind of system using liquid nitrogen artificial snow | |
| CA2435930A1 (en) | Water-only method and apparatus for making snow | |
| US5529242A (en) | Device for making snow | |
| CN202835977U (en) | Snowmaker with nucleon generator nozzles of variable quantity | |
| KR20010078723A (en) | Snow gun | |
| EP1710519B1 (en) | A method and device for snow making | |
| CN112923623A (en) | Snow making machine with high snow making rate and control method and working method thereof | |
| CN102128531A (en) | Method and device for preparing granular ice by freezing atomized water drops in cold carrying airflow | |
| JP4289776B2 (en) | Sherbet snow production spray device | |
| US7874500B2 (en) | Snow making apparatus | |
| CA2258424C (en) | Snow gun for making artificial snow | |
| CN202032803U (en) | Device for producing granular ice by freezing atomized water drops in cold-carrying airflow | |
| US6182905B1 (en) | Apparatus and method for making snow | |
| CN1195193C (en) | Artificial snow-producing apparatus using natural cold-amount at atmosphere | |
| EP2601462B1 (en) | Method of production of artificial snow and apparatus for carrying out this method | |
| CN203200634U (en) | Foamed asphalt generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170510 |
|
| RJ01 | Rejection of invention patent application after publication |