CN112797686A - Direct-cooling type ice-making system for balancing load of compressor and control method thereof - Google Patents
Direct-cooling type ice-making system for balancing load of compressor and control method thereof Download PDFInfo
- Publication number
- CN112797686A CN112797686A CN202110118728.4A CN202110118728A CN112797686A CN 112797686 A CN112797686 A CN 112797686A CN 202110118728 A CN202110118728 A CN 202110118728A CN 112797686 A CN112797686 A CN 112797686A
- Authority
- CN
- China
- Prior art keywords
- refrigerant
- ice
- control valve
- ice making
- heat exchange
- 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.)
- Granted
Links
Images
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
- F25C1/00—Producing ice
- F25C1/04—Producing ice by using stationary moulds
-
- 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
- F25C5/00—Working or handling ice
- F25C5/02—Apparatus for disintegrating, removing or harvesting ice
- F25C5/04—Apparatus for disintegrating, removing or harvesting ice without the use of saws
- F25C5/08—Apparatus for disintegrating, removing or harvesting ice without the use of saws by heating bodies in contact with the ice
- F25C5/10—Apparatus for disintegrating, removing or harvesting ice without the use of saws by heating bodies in contact with the ice using hot refrigerant; using fluid heated by refrigerant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/85—Food storage or conservation, e.g. cooling or drying
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Production, Working, Storing, Or Distribution Of Ice (AREA)
Abstract
The invention discloses a direct cooling type ice making system for balancing the load of a compressor and a control method thereof.A second heat exchange tube is additionally arranged in a composite ice mould side plate, the liquid inlet end of the composite ice mould side plate is connected with a liquid supply main pipe, and the liquid supply main pipe is connected with a refrigerant box through a pipeline with a refrigerant liquid supply control valve and a refrigerant water pump; and the liquid outlet end of the second heat exchange tube is connected with a liquid return main pipe, and the liquid return main pipe is connected with the refrigerant box through a refrigerant liquid return control valve. The present invention belongs to a double-effect ice-making mode. The system has the advantages of high heat exchange efficiency of direct cooling type and load balance of indirect ice making compressor. The refrigeration of the compression condensing unit and the refrigeration of the refrigerant box are mutually matched to provide the ice-making cold energy in the ice-making process, and the ice-making machine belongs to a double-effect ice-making mode. Meanwhile, the refrigerant of the refrigerant box also has the function of balancing the cold quantity in the ice making process.
Description
Technical Field
The invention relates to a direct-cooling ice making system and a control method thereof.
Background
As a prior art ice making system, one way is direct cooling type ice making, i.e., a refrigerant direct evaporation type ice making system. The other mode is an indirect ice making mode, namely, an intermediate refrigerant medium is cooled by a refrigerant, and then ice is made by cooling by the refrigerant medium, for example, an energy-saving cold storage ice making system disclosed in the chinese patent application with publication number CN105674654A is an indirect ice making system. The main disadvantage of the indirect ice making method is that the cold energy required by ice making needs to be subjected to secondary heat exchange. And thus the refrigeration compressor has low refrigeration efficiency. It also presents a phenomenon of ice making imbalance.
In the existing direct-cooling ice making system, water for making ice is generally filled in a combined ice mold, then a compression condensing unit is started to refrigerate the combined ice mold, and ice making is started. When ice making starts, the water temperature in the ice mold is higher, generally about 20 ℃, the water temperature in some regions is higher than 24 ℃, and the water temperature in some special cases is higher than 30 ℃. The compressor load is too high in the initial stage of ice making, the operation condition is severe, and the steam suction pressure and the steam exhaust pressure are too high, so that the service life of the compressor is influenced. And in the later stage of ice making, the cold load is small, the control of a refrigeration compressor is difficult, and the phenomenon of liquid return occurs. And seriously affects the service life of the refrigerator. In addition, in the ice making process, the difference of the freezing speed in each ice mold is large due to uneven cooling.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a direct cooling type ice making system for balancing the load of a compressor and a control method thereof, so that the operation condition of the refrigeration compressor is in a more controllable balanced state, the refrigeration is more stable, and the ice making efficiency is higher.
The technical scheme of the invention is as follows:
a direct cooling formula ice-making system for balancing compressor load, including ice making device, ice making device includes a set of compound ice mould, compound ice mould including the built-in ice mould curb plate that has first heat exchange tube, ice making system still includes the compression condensing unit, the compression condensing unit has first refrigerant to supply liquid header through compressor feed pipe connection, first refrigerant supplies liquid header to supply liquid branch connection through first refrigerant the inlet end of first heat exchange tube, the play liquid end of first heat exchange tube is connected with refrigerant return air header through refrigerant return air branch pipe, refrigerant return air header passes through compressor return air pipe connection compression condensing unit, its characterized in that: the ice making system also comprises a second heat exchange tube arranged in the composite ice mould side plate, the liquid inlet end of the second heat exchange tube is connected with a second refrigerant liquid supply header through a second refrigerant liquid supply branch tube, the second refrigerant liquid supply header is connected with a liquid supply main pipe, and the liquid supply main pipe is connected with a refrigerant box through a pipeline with a refrigerant liquid supply control valve and a refrigerant water pump; the liquid outlet end of the second heat exchange tube is connected with a refrigerant liquid return header through a refrigerant liquid return branch tube, the refrigerant liquid return header is connected with a liquid return header pipe, and the liquid return header pipe is connected with the refrigerant box through a refrigerant liquid return control valve; the ice making device further includes an upper cover plate and a movable floor plate.
Preferably, the liquid supply main pipe is connected with a hot water tank through a pipeline with a hot water supply control valve and a hot water pump; the liquid return main pipe is connected with the hot water tank through a hot water return control valve.
Preferably, the first heat exchange tube and the second heat exchange tube are leant against the ice mold side plate, and the first heat exchange tube and the second heat exchange tube are leant against each other, so that efficient heat exchange is facilitated.
The control method of the ice making system is characterized in that:
starting a compression condensing unit in the whole process of first-batch ice making or the early stage of first-batch ice making, and starting a refrigerant liquid return control valve, a refrigerant water pump and a refrigerant liquid supply control valve to cool while making ice so as to enable the liquid in a refrigerant box to reach a set temperature;
starting the second batch of ice making, opening a refrigerant liquid return control valve, a refrigerant water pump and a refrigerant liquid supply control valve in the water injection stage of each batch of ice making, closing the compression condensing unit, and pre-cooling the water to be sequentially injected through a low-temperature refrigerant;
then starting a compression condensing unit for refrigeration, and enabling a refrigerant liquid return control valve, a refrigerant water pump and a refrigerant liquid supply control valve to be in an open state;
and at the later stage of ice making, closing the compression condensing unit, and independently supplying cold by the refrigerant water pump until the ice making is finished.
Preferably, after ice making is finished, the refrigerant water pump is turned off, and after the refrigerant flows back to the refrigerant tank, the refrigerant liquid return control valve and the refrigerant liquid supply control valve are turned off; and starting the hot water return control valve, the hot water supply control valve and the hot water pump to melt ice and demould.
The invention has the positive effects that: the present invention belongs to a double-effect ice-making mode. The system has the advantages of high heat exchange efficiency of direct cooling type and load balance of indirect ice making compressor. The refrigeration of the compression condensing unit and the refrigeration of the refrigerant box are mutually matched to provide the ice-making cold energy in the ice-making process, and the ice-making machine belongs to a double-effect ice-making mode. Meanwhile, the refrigerant of the refrigerant box also has the function of balancing the cold quantity in the ice making process.
When the system starts the compressor for refrigeration, the refrigerant water pump is also in the running state, so the running working condition of the refrigeration compressor is in a controllable ideal working state. The refrigeration is stable, and the refrigeration efficiency is high. In the refrigeration process, because the refrigerant is in a flowing state in the ice mold side plates, the cold energy supply of the whole set of ice making ice mold is in a relatively uniform state, and the whole ice making efficiency is improved. In the later stage of ice making, the refrigerant in the refrigerant tank reaches the condition of very low temperature, and the cold storage refrigerant water tank has the cold storage function. Therefore, the compressor can be stopped, and the unit is only required to be operated by the refrigerant water pump for cooling. The compressor is protected, the service life of the compressor is prolonged, and the integral ice making efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of the structure and operation of an ice-making system according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples and figures.
Referring to fig. 1, an embodiment of a direct-cooling ice-making system for balancing a load of a compressor according to the present invention includes an ice-making device 1, wherein the ice-making device 1 includes a plurality of composite ice molds, and each composite ice mold includes an ice mold side plate having a first heat exchange pipe disposed therein, an ice mold upper cover plate, and an ice mold movable bottom plate. The embodiment of the direct cooling type ice making system further comprises a compression condensing unit 5, a compressor liquid supply pipe 12 of the compression condensing unit 5 is connected with a first refrigerant liquid supply header 6, the first refrigerant liquid supply header 6 is connected with the liquid inlet end of the first heat exchange pipe through a first refrigerant liquid supply branch pipe 9, the liquid outlet end of the first heat exchange pipe is connected with a refrigerant return air header 3 through a refrigerant return air branch pipe 2, and the refrigerant return air header 3 is connected with the compression condensing unit 5 through a compressor return air pipe 4.
The ice making device 1 also comprises an upper cover plate 1-1 positioned at the upper end of the ice mould and a movable bottom plate 1-2 positioned at the lower end of the ice mould, wherein the upper cover plate 1-1 is used for heat preservation, a water injection pipe is usually arranged on the upper cover plate 1-1, and the water injection pipe can be removed without arranging the water injection pipe and injecting water into the upper cover plate 1-1. And the cover is covered after the water is filled. The movable bottom plate 1-2 has the function that after ice making is finished and the side wall of an ice block is melted, the movable bottom plate 1-2 is opened, and the ice block is separated out by gravity. The movable floor 1-2 can also be replaced by a fixed floor, in which case the ice pieces with the melted side walls need to be lifted upwards. The present embodiment selects the movable floor 1-2.
The embodiment of the direct cooling type ice making system further comprises a refrigerant tank 16 and a hot water tank 21.
The embodiment of the direct-cooling ice making system further comprises a second heat exchange tube arranged in the composite ice mould side plate, the liquid inlet end of the second heat exchange tube is connected with a second refrigerant liquid supply header 11 through a second refrigerant liquid supply branch tube 10, the second refrigerant liquid supply header 11 is connected with a liquid supply main pipe 13, the liquid supply main pipe 13 is connected with the refrigerant box 16 through a pipeline with a refrigerant liquid supply control valve 18 and a refrigerant water pump 17, and the liquid supply main pipe 13 is further connected with the hot water box 21 through a pipeline with a hot water supply control valve 19 and a hot water pump 20. The liquid outlet end of the second heat exchange tube is connected with a refrigerant liquid return header 7 through a refrigerant liquid return branch tube 8, the refrigerant liquid return header 7 is connected with a liquid return header 22, the liquid return header 22 is connected with the refrigerant tank 16 through a refrigerant liquid return control valve 15, and the liquid return header 22 is further connected with the hot water tank 21 through a hot water return control valve 14.
The ice mold side plate is generally a double-layer metal plate, the first heat exchange tube and the second heat exchange tube are leaned on the metal plate, and the first heat exchange tube and the second heat exchange tube are mutually leaned against each other so as to facilitate efficient heat exchange.
The control method of the embodiment of the invention comprises the following steps:
in the whole process of the first ice making or in the early stage of the first ice making (for example, in a period of 2 hours before the first ice making starts to end), the compression condensing unit 5 is started, and the refrigerant liquid return control valve 15, the refrigerant water pump 17 and the refrigerant liquid supply control valve 18 are started to cool the ice while making the ice, so that the liquid in the refrigerant tank 16 reaches the set temperature.
Starting from the second ice making, the water filling stage (which lasts about 30 minutes generally) of each ice making is only started by the refrigerant liquid return control valve 15, the refrigerant water pump 17 and the refrigerant liquid supply control valve 18, and the water filled in the following is pre-cooled by the low-temperature refrigerant. At this time, the compression condensing unit 5, the hot-water return control valve 14, the hot-water supply control valve 19, and the hot-water pump 20 are all in the closed state. When the water is filled, the water temperature can be reduced by about 5 ℃ under the general condition.
Then the compression condensing unit 5 is started to refrigerate, and the refrigerant liquid return control valve 15, the refrigerant water pump 17 and the refrigerant liquid supply control valve 18 are in an opening state, so that the refrigerant water pump 17 is also in an operating state.
In the later stage of ice making (for example, 2 hours from the end of ice making), the compression and condensation unit 5 is closed, and cooling is supplied to the end of ice making by the refrigerant water pump 17 alone.
After the ice making is finished, the refrigerant water pump 17 is turned off, and after the refrigerant returns to the refrigerant tank 16, the refrigerant liquid return control valve 15 and the refrigerant liquid supply control valve 18 are turned off. And (4) starting the hot water return control valve 14, the hot water supply control valve 19 and the hot water pump 20 to melt ice and demould.
The system may also set the cold medium to an upper temperature limit and a lower temperature limit. The compressor is on at the upper limit temperature and stopped at the lower limit temperature, and the refrigerant water pump 17 is normally open. The compressor always operates in an economical and efficient refrigeration range under the working condition, and is more economical and energy-saving.
The heat energy of the water in the hot water tank 21 can be obtained from the compression condensing unit 5, or can be obtained in other manners.
Claims (5)
1. A direct cooling formula ice-making system for balancing compressor load, including ice making device (1), ice making device (1) includes a set of compound ice mould, compound ice mould including built-in ice mould curb plate that has first heat exchange tube, ice making system still includes compression condensing unit (5), compression condensing unit (5) are connected with first refrigerant through compressor feed pipe (12) and supply header (6), first refrigerant supplies liquid header (6) to connect through first refrigerant liquid supply branch pipe (9) the inlet end of first heat exchange tube, the play liquid end of first heat exchange tube is connected with refrigerant return air header (3) through refrigerant return air branch pipe (2), refrigerant return air header (3) are through compressor return air pipe (4) connection compression condensing unit (5), its characterized in that: the ice making system also comprises a second heat exchange tube arranged in the composite ice mould side plate, the liquid inlet end of the second heat exchange tube is connected with a second refrigerant liquid supply header (11) through a second refrigerant liquid supply branch tube (10), the second refrigerant liquid supply header (11) is connected with a liquid supply main pipe (13), and the liquid supply main pipe (13) is connected with a refrigerant box (16) through a pipeline with a refrigerant liquid supply control valve (18) and a refrigerant water pump (17); the liquid outlet end of the second heat exchange tube is connected with a refrigerant liquid return header (7) through a refrigerant liquid return branch tube (8), the refrigerant liquid return header (7) is connected with a liquid return header pipe (22), and the liquid return header pipe (22) is connected with the refrigerant box (16) through a refrigerant liquid return control valve (15); the ice making device (1) also comprises an upper cover plate (1-1) and a movable bottom plate (1-2).
2. The direct cooling type ice making system for balancing a load of a compressor as claimed in claim 1, wherein: the liquid supply main pipe (13) is connected with a hot water tank (21) through a pipeline with a hot water supply control valve (19) and a hot water pump (20); the liquid return main pipe (22) is connected with the hot water tank (21) through a hot water return control valve (14).
3. The direct-cooling type ice making system for balancing a load of a compressor as claimed in claim 1 or 2, wherein: the first heat exchange tube and the second heat exchange tube are leaned against the ice mold side plate, and the first heat exchange tube and the second heat exchange tube are mutually leaned against each other, so that efficient heat exchange is facilitated.
4. The control method of an ice making system as set forth in claim 1, 2 or 3, wherein:
starting a compression condensing unit in the whole process of first-batch ice making or the early stage of first-batch ice making, and starting a refrigerant liquid return control valve, a refrigerant water pump and a refrigerant liquid supply control valve to cool while making ice so as to enable the liquid in a refrigerant box to reach a set temperature;
starting the second batch of ice making, opening a refrigerant liquid return control valve, a refrigerant water pump and a refrigerant liquid supply control valve in the water injection stage of each batch of ice making, closing the compression condensing unit, and pre-cooling the water to be sequentially injected through a low-temperature refrigerant;
then starting a compression condensing unit for refrigeration, and enabling a refrigerant liquid return control valve, a refrigerant water pump and a refrigerant liquid supply control valve to be in an open state;
and at the later stage of ice making, closing the compression condensing unit, and independently supplying cold by the refrigerant water pump until the ice making is finished.
5. The control method according to claim 4, characterized in that: after ice making is finished, the refrigerant water pump is closed, and after the refrigerant flows back to the refrigerant box, the refrigerant liquid return control valve and the refrigerant liquid supply control valve are closed; and starting the hot water return control valve, the hot water supply control valve and the hot water pump to melt ice and demould.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011550946 | 2020-12-24 | ||
| CN2020115509467 | 2020-12-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112797686A true CN112797686A (en) | 2021-05-14 |
| CN112797686B CN112797686B (en) | 2022-03-25 |
Family
ID=75812490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110118728.4A Active CN112797686B (en) | 2020-12-24 | 2021-01-28 | Direct-cooling type ice-making system for balancing load of compressor and control method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112797686B (en) |
| WO (1) | WO2022135334A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117287862A (en) * | 2023-11-27 | 2023-12-26 | 佛山市宏成新材料科技有限公司 | Vegetable cold chain ice making system and ice making process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04302969A (en) * | 1991-03-28 | 1992-10-26 | Shimizu Corp | Ice making machine for ice-heat storage |
| CN101216235A (en) * | 2008-01-21 | 2008-07-09 | 河南新飞电器有限公司 | Energy-accumulating refrigerator |
| CN202734383U (en) * | 2012-06-26 | 2013-02-13 | 上海理工大学 | Small dual-temperature cold storage water-cooled refrigerator |
| CN105674654A (en) * | 2016-04-05 | 2016-06-15 | 周航 | Energy-saving cold-storage ice-making system |
| CN211739594U (en) * | 2020-01-14 | 2020-10-23 | 宜兴市冰源制冷设备有限公司 | Refrigerating system of direct cooling type block ice machine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202040916U (en) * | 2011-03-15 | 2011-11-16 | 上海弗格森制冷设备有限公司 | Dynamic ice cold storing and refrigerating equipment |
| CN202709539U (en) * | 2012-04-25 | 2013-01-30 | 上禾谷能源科技（北京）有限公司 | Cascade lithium-bromide refrigerating and cold-storage system |
| CN204006861U (en) * | 2014-07-29 | 2014-12-10 | 江苏天舒电器有限公司 | A kind of industrial cold and hot balancing machine group system |
-
2021
- 2021-01-28 CN CN202110118728.4A patent/CN112797686B/en active Active
- 2021-12-20 WO PCT/CN2021/139623 patent/WO2022135334A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04302969A (en) * | 1991-03-28 | 1992-10-26 | Shimizu Corp | Ice making machine for ice-heat storage |
| CN101216235A (en) * | 2008-01-21 | 2008-07-09 | 河南新飞电器有限公司 | Energy-accumulating refrigerator |
| CN202734383U (en) * | 2012-06-26 | 2013-02-13 | 上海理工大学 | Small dual-temperature cold storage water-cooled refrigerator |
| CN105674654A (en) * | 2016-04-05 | 2016-06-15 | 周航 | Energy-saving cold-storage ice-making system |
| CN211739594U (en) * | 2020-01-14 | 2020-10-23 | 宜兴市冰源制冷设备有限公司 | Refrigerating system of direct cooling type block ice machine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117287862A (en) * | 2023-11-27 | 2023-12-26 | 佛山市宏成新材料科技有限公司 | Vegetable cold chain ice making system and ice making process |
| CN117287862B (en) * | 2023-11-27 | 2024-02-13 | 佛山市宏成新材料科技有限公司 | Vegetable cold chain ice making system and ice making process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112797686B (en) | 2022-03-25 |
| WO2022135334A1 (en) | 2022-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100547341B1 (en) | The refrigerator | |
| CN102102934B (en) | Refrigerator and operation control method thereof | |
| CN101903718A (en) | Ice maker for refrigerator | |
| CN107289699A (en) | A kind of Novel movable ice machine | |
| CN112797686B (en) | Direct-cooling type ice-making system for balancing load of compressor and control method thereof | |
| CN107345718A (en) | Cold storage Multi-compressor refrigeration system, compressor set and Condensing units | |
| CN103134235B (en) | Coil pipe substep defrosting heat pump system | |
| CN109737657A (en) | A kind of automatic straight jelly formula clear ice bodies ice machine | |
| CN1987314B (en) | Integrated machine for vacuum freezing and drying | |
| CN214307732U (en) | Direct cooling type ice making system for balancing load of compressor | |
| KR100791424B1 (en) | System for producing chilled water | |
| CN101936635A (en) | Cascade storage temperature refrigerator and temperature control method | |
| US1322660A (en) | Ice-making pbocess | |
| CN208431976U (en) | A kind of carbon dioxide refrigerating medium refrigeration system | |
| CN115751750A (en) | Condensing unit and control method | |
| CN109059327A (en) | A kind of device and method making superposition type Cryo Refrigerator long-period stable operation | |
| CN211424781U (en) | Hot gas defrosting system | |
| CN208907690U (en) | A kind of ammonia refrigeration system | |
| CN209783040U (en) | Vacuum sublimation evaporation cold and heat energy separation heat supply or cold supply equipment | |
| CN219222932U (en) | Ice machine with heat preservation function | |
| CN115371292B (en) | Full-liquid refrigerating system for separating and purifying return gas oil and draining defrosting return liquid | |
| CN210861865U (en) | Refrigerating system of flooded direct-cooling ice maker | |
| CN2611840Y (en) | Cool storage compressed air freezing dryer | |
| CN205561366U (en) | Adopt direct expansion formula subcooling water -ice thick liquid manufacturing installation of ammonia refrigeration system | |
| CN218672806U (en) | Energy-saving emission-reducing refrigerator |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |