CN108645070A - High reliability low temperature refrigeration machine - Google Patents
High reliability low temperature refrigeration machine Download PDFInfo
- Publication number
- CN108645070A CN108645070A CN201810566127.8A CN201810566127A CN108645070A CN 108645070 A CN108645070 A CN 108645070A CN 201810566127 A CN201810566127 A CN 201810566127A CN 108645070 A CN108645070 A CN 108645070A
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- Prior art keywords
- low
- refrigeration machine
- annular groove
- pressure
- low pressure
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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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
- F25B9/145—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle pulse-tube cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/14—Compression machines, plants or systems characterised by the cycle used
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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
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
Abstract
The invention discloses a kind of high reliability low temperature refrigeration machines, including compressor (1), cover body component (2), distributing valve (6), rotary valve (7), motor (12), cylinder (13) and annular groove (23), cover body component (2) at the annular groove (23) is equipped with the low pressure exhaust hole (24) of connection annular groove (23), and the outlet end in the low pressure exhaust hole (24) is connected by low pressure air suction pipeline (1b) with the low-pressure side of compressor；The rotary valve (7) is equipped with the low-pressure channel (73) that can be connected with annular groove (23), and the other end of the low-pressure channel (73) is connected with the trough (71) on rotary valve (7).By the setting in low pressure exhaust hole and low-pressure channel, the powder of relative motion generation is carried the present invention by the gas of low pressure return between rotary valve and distributing valve, is directly discharged by the low pressure exhaust hole on cover body component, improves the service life of equipment.
Description
Technical field
It is specifically a kind of by opening up low pressure row on cover body component the present invention relates to Cryo Refrigerator technical field
Stomata to avoid low pressure return high reliability low temperature refrigeration machine of the gas Jing Guo driving mechanism and actuating unit.
Background technology
With Ji Fude-McMahon (Gifford-McMahon；GM) refrigeration machine, which is the ultra-low temperature refrigerating device of representative, has work
Make the expanding machine and compressor of gas (also referred to as refrigerant gas).Fig. 1 is such refrigeration machine, and discharge is provided by compressor 1
High pressure draught, entered via valve actuating mechanism RV (distributing valve 6 and rotary valve 7) be placed in cylinder 13, pushing away of pumping
It moves in piston, exchanges heat with cool storage material 10c, then distribution is flowed out using pushing piston to acting expansion in expansion chamber 9
Mechanism, via connecting rod 5, the low pressure air suction pipeline 1b of low pressure chamber 22, motor 12 and compressor 1 on cam 3, cover body component 2,
It returns in the low pressure chamber of compressor 1.By above-mentioned continuous cyclic process, refrigeration effect is formed.General valve actuating mechanism is using flat
Face rotary valve, including：6 two critical pieces of rotary valve 7 and distributing valve, one of component uses resin wear-resistant material, another
A component is made using metal material.When work, two component planes are bonded to each other, and pass through the rotation of rotary valve 7, switching rotation
The connected state of valve 7 and the conduit on distributing valve 6 realizes the switching of height pressure gas stream；And the process of fitting passes through valve actuating mechanism
The pressure difference of both sides compresses to realize.
Specifically, such refrigeration machine as shown in Figure 1 includes compressor 1, cover body component 2, cylinder 13, pushing piston
10, there is fixed lead in the interior cam 3 equipped with connecting rod 5, motor 12 and driving of cover body component 2,5 upper and lower ends of connecting rod outside
To set 4, it is ensured that connecting rod 5 pumps only along axial；Rotary valve 7 is mounted on bearing 14 and is rotated along rotary shaft.
Eccentric cam handle 31 on cam 3 drives connecting rod 5 by convert rotational motion at pumping, to drive pushing piston to exist
It moves up and down in cylinder 13.Valve actuating mechanism RV is made of distributing valve 6 and rotary valve 7, and distributing valve 6 is mounted in cover body component 2, by
Positioning pin 16 is fixed therein, and coaxially arranged with rotary valve 7, and cam handle 31 drives 7 edge of rotary valve being mounted on bearing 14
Rotary shaft rotation；The rotary valve 7 of distributing valve 6 and switch sides flow path makes the rotary valve, 7 diverter surface 75 and distributing valve 6
Distribution face 61 be close to be combined, and make rotary valve 7 rotate, to switch 6 distribution effluent road of the distributing valve and the rotation
The connection status of the switch sides flow path of valve 7.Compressor 1 is allowed to the system as high pressure by sucking, compressing by refrigerant gas
Refrigerant gas is discharged.High pressure gas pipeline 1a supplies the refrigerant gas of high pressure to cover body component 2, and passes through distributing valve
High pressure stomata 62 on 6 passes in the high-pressure trough 72 on the rotary valve 7 of airtight fitting therewith, high-pressure trough 72 not with trough 71
Connection.Trough 71 is provided on rotary valve 7, and trough 71 is connected to the low pressure chamber 22 in cover body component 2.Shown in Fig. 1
Position, the connection Chong Die with the air distribution hole 63 on distributing valve 6 of trough 71, this moment, on the trough 71, distributing valve 6 on rotary valve 7
Air distribution hole 63 and cover body component 2 on 21 three of cover body stomata connection, system is in the low pressure exhaust stage, in expansion chamber 9
Gas low pressure is become by high pressure, sequentially pass through the preceding hole 10a of piston metapore 10b, cool storage material 10c, piston on pushing piston
Outflow, returns to the low pressure air suction pipeline 1b of compressor 1.After rotary valve 7 rotates by a certain angle, at this point, trough 71 not with
Air distribution hole 63 on air valve 6 is connected to, and the high-pressure trough 72 being turned on rotary valve 7 is connected to the air distribution hole 63 on distributing valve 6 and (does not draw
Go out the matching relationship), the high pressure gas that compressor 1 is discharged this moment, by high pressure stomata 62 on distributing valve 6 and in communication
High-pressure trough 72 and air distribution hole 63 on rotary valve 7 enter in cylinder 13, sequentially through on pushing piston the preceding hole 10a of piston,
Cool storage material 10c, piston metapore 10b are entered in expansion chamber 9.
In above process, distributing valve 6 is tightly bonded with rotary valve 7 by pressure difference, is formed airtight sliding and is connect
Contacting surface.In During Process of Long-term Operation, mutually abrasion generates a large amount of powder and clast between distributing valve 6 and rotary valve 7, with low pressure
The air-flow of reflux flows together, is gradually accumulate on the surface of connecting rod 5, and then during pumping, powder enters
Into the small gaps between guide sleeve 4 and connecting rod 5, it be easy to cause catching phenomenon；Meanwhile remaining powder and clast continue with
The flowing for air-flow enters in motor 12, is collected on the stator and rotor inside motor 12, causes 12 operating condition of motor
Deteriorate, load the problems such as increase, torque reduction；Long-term accumulation can cause driving mechanism and motor stuck.In addition, by a large amount of
Experiment find：In the process of running, it is fitted tightly between distributing valve 6 and rotary valve 7 and non-fully together.It is shown in Fig. 1
In the state of, i.e., when refrigeration machine is in low pressure gas circuit connected state, the binding face between distributing valve 6 and rotary valve 7 can be rotated
The high pressure draught in high-pressure trough 72 on valve 7 is instantaneously washed open so that forms of short duration pressure in the annular groove 23 on 14 right side of bearing
Air cavity, and at this moment, the pressure in annular groove 23 is more than the pressure in the low pressure chamber 22 in 14 left side of bearing so that 14 both sides shape of bearing
At pressure difference；In this case, the powder of abrasion can be ejected into annular groove 23 with high pressure draught, then be entered by pressure difference
To inside bearing 14, increases the mechanical wear of bearing 14, reduces the service life of bearing 14.
Invention content
In response to the problems existing in the prior art, the purpose of the present invention is to provide one kind by opening up low pressure on cover body component
Gas vent to avoid low pressure return high reliability low temperature refrigeration machine of the gas Jing Guo driving mechanism and actuating unit.
The purpose of the present invention is what is solved by the following technical programs：
A kind of high reliability low temperature refrigeration machine, including compressor, cover body component, distributing valve, rotary valve, motor and cylinder,
Annular groove is constituted between distributing valve and the contact surface side and the inner wall of cover body component of rotary valve, it is characterised in that：The annular
Cover body component at slot is equipped with the low pressure exhaust hole of connection annular groove, and the outlet end in the low pressure exhaust hole passes through low pressure air suction pipe
Road is connected with the low-pressure side of compressor；The rotary valve is equipped with the low-pressure channel that can be connected with annular groove, this is low
The other end of pressure passageway is connected with the trough on rotary valve so that air distribution hole, trough on cover body stomata, distributing valve,
Low-pressure channel, annular groove, low pressure exhaust hole and low pressure air suction pipeline can form the low-pressure gas access being connected to.
The low pressure exhaust hole is not connected to air distribution hole, the high pressure stomata on distributing valve.
The axis parallel in the low pressure exhaust hole is in the central axes of distributing valve.
The low pressure exhaust hole is separately positioned on the both sides of distributing valve with cover body stomata.
The low pressure exhaust hole is vertically arranged with annular groove, and the connectivity part of the two is located in the middle part of the vallecular cavity of annular groove.
The trough axially penetrates through rotary valve, is closed so that trough can be connected on annular groove and cover body component
Low pressure chamber.
The low-pressure channel is arranged perpendicular to trough and distributing valve setting is biased in the junction of the two.
The section of the low-pressure channel is L-shaped.
The diverter surface of the rotary valve protrudes from the rotation reference face setting of rotary valve and/or the distribution face protrusion of distributing valve
It is arranged in the distribution reference plane of distributing valve, to increase the volume of annular groove.
The refrigeration machine includes Ji Fude-McMahon type refrigeration machine, Sol text refrigeration machine, vascular refrigerator.
The present invention has the following advantages compared with prior art：
The present invention is by the setting in low pressure exhaust hole and low-pressure channel, relative motion generation between rotary valve and distributing valve
Powder is carried by the gas of low pressure return, is directly discharged by the low pressure exhaust hole on cover body component so that the gas of low pressure return
Body is discharged directly to the suction of compressor without driving mechanisms such as connecting rod, cams, also without the motor as actuating unit
Gas port avoids the impurity in reflux gas from being contacted with the driving mechanism of refrigeration machine and actuating unit, moving component is avoided powder occur
Last catching phenomenon causes mechanical wear, improves the service life of equipment.
Description of the drawings
Attached drawing 1 is the composition schematic diagram for indicating Conventional cryogenic refrigeration machine；
Attached drawing 2 is the composition schematic diagram of the cryogenic refrigeration bonnet body components of the present invention；
Attached drawing 3 is structural schematic diagram of the valve actuating mechanism of the present invention in low pressure gas circuit connected state；
Attached drawing 4 is structural schematic diagram of the valve actuating mechanism of the present invention in high-pressure gas circuit connected state；
Attached drawing 5 is the detailed construction schematic diagram of the distributing valve of the present invention；
Attached drawing 6 is the detailed construction schematic diagram of the rotary valve of the present invention.
Wherein：1-compressor；1a-high pressure gas pipeline；1b-low pressure air suction pipeline；2-cover body components；21-cover bodies
Stomata；22-low pressure chambers；23-annular grooves；24-low pressure exhaust holes；3-cams；31-eccentric cam handles；4-guide sleeves；
5-connecting rods；6-distributing valves；61-distribution face；62-high pressure stomatas；63-air distribution holes；64-distribution reference planes；7-rotations
Valve；71-troughs；72-high-pressure troughs；73-low-pressure channels；74-rotation reference faces；75-diverter surfaces；8-hot chambers；9-is swollen
Swollen chamber；The preceding hole of 10a-piston；10b-piston metapore；10c-cool storage material；12-motors；13-cylinders；14-bearings；
15-springs；16-positioning pins；The first sealing rings of b1-；The second sealing rings of b2-.
Specific implementation mode
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings.
As shown in figures 2-6：A kind of high reliability low temperature refrigeration machine, including compressor 1, cover body component 2, distributing valve 6, rotation
Annular is constituted between the contact surface side and the inner wall of cover body component 2 of valve 7, motor 12 and cylinder 13, distributing valve 6 and rotary valve 7
Slot 23 is equipped with the low pressure exhaust hole 24 of connection annular groove 23 on the cover body component 2 at annular groove 23, the low pressure exhaust hole 24
Outlet end is connected by low pressure air suction pipeline 1b with the low-pressure side of compressor；Being equipped on rotary valve 7 can be with annular groove 23
The low-pressure channel 73 being connected, the other end of the low-pressure channel 73 are connected with the trough 71 on rotary valve 7 so that cover body gas
Air distribution hole 63, trough 71, low-pressure channel 73, annular groove 23, low pressure exhaust hole 24 on hole 21, distributing valve 6 and low pressure air suction
Pipeline 1b can form the low-pressure gas access of connection.In this way, during Cryo Refrigerator whole service, on rotary valve 7
Air-flow in trough 71, low-pressure channel 73, annular groove 23 and low pressure exhaust hole 24 remains low-pressure state.Work as rotary valve
7 when running to position shown in Fig. 3, and Cryo Refrigerator is in low pressure valve open state, and the gas of reflux carries abrasion and generates
Powder and clast from rotary valve 7 low-pressure channel 73 flow out, enter in annular groove 23, then pass through 23 row of low pressure exhaust hole
Go out.
Further embodiment is：Low pressure exhaust hole 24 be not connected to air distribution hole 63, the high pressure stomata 62 on distributing valve 6 so that
The gas of reflux can follow the prescribed course traveling；The axis parallel in low pressure exhaust hole 24 is low in the central axes of distributing valve 6
Pressure stomata 24 is separately positioned on the both sides of distributing valve 6 with cover body stomata 21；Low pressure exhaust hole 24 is vertically arranged with annular groove 23,
And the connectivity part of the two is located in the middle part of the vallecular cavity of annular groove 23；Low-pressure channel 73 is arranged perpendicular to trough 71 and the connection of the two
Place is biased to distributing valve 6 and is arranged, and the section of low-pressure channel 73 is L-shaped at this time.
In addition, trough 71 axially penetrates through rotary valve 7, so that trough 71 can be connected to annular groove 23 and cover body component
Closed low pressure chamber 22 on 2, but low pressure chamber 22 is closed dead space, low-pressure air current will not be flowed into along trough 71, therefore
Also there will be no powder or clast to be flowed into low pressure chamber 22, and clast and connecting rod 5, cam 3 and motor 12 is avoided to contact.It is true
On, it is in order to which refrigeration machine turns to vacuumize after matching and is filled with corresponding gas for being connected to for closing trough 71 and low pressure chamber 22.
In addition, the present embodiment ensures that the air-flow in annular groove 23 will not be flowed by bearing 14 in low pressure chamber 22,
And enter directly into low pressure exhaust hole 24, therefore, avoids powder and clast enters in bearing 14.
It further illustrates, distributing valve is placed with the first sealing ring b1 and the second sealing ring b2 on 6 outside, to cover body group
Part 2 carries out lateral seal, it is ensured that air distribution hole 63 and the airtight connection of cover body stomata 21.Under Fig. 4 states, the high pressure of rotary valve 7
High pressure stomata 62 on distributing valve 6 is connected to by slot 72 with air distribution hole 63, realizes the function of high pressure admission.
To reduce the flow resistance that low pressure flows exhaust process, in implementation process, increase the appearance of annular groove 23 as far as possible
Product.Distributing valve 6, rotary valve 7 are designed to boss structure, as shown in Figure 5, Figure 6.The diverter surface 75 of rotary valve 7 protrudes from rotation
The distribution reference plane 64 that the setting of rotation reference face 74 of valve 7 and/or the distribution face 61 of distributing valve 6 protrude from distributing valve 6 is arranged, only
The distribution face of allowing 61 and diverter surface 75 fit together, to increase the volume of annular groove 23.
In addition, in the present embodiment, refrigeration machine of the invention is any type of Cryo Refrigerator of valve transfer formula,
Such as：Lucky Ford-McMahon refrigeration machine, Sol text refrigeration machine, vascular refrigerator etc..
The present invention is by the setting in low pressure exhaust hole 24 and low-pressure channel 73, relative motion between rotary valve 7 and distributing valve 6
The powder of generation is carried by the gas of low pressure return, is directly discharged by the low pressure exhaust hole 24 on cover body component 2 so that low pressure
The gas of reflux is expelled directly out without driving mechanisms such as connecting rod 5, cams 3, also without the motor 12 as actuating unit
To the air entry of compressor, avoids the impurity in reflux gas from being contacted with the driving mechanism of refrigeration machine and actuating unit, avoid transporting
There is powder catching phenomenon, causes mechanical wear in dynamic component, improves the service life of equipment.
Above example is merely illustrative of the invention's technical idea, and protection scope of the present invention cannot be limited with this, every
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention
Within；The technology that the present invention is not directed to can be realized by the prior art.
Claims (10)
1. a kind of high reliability low temperature refrigeration machine, including compressor (1), cover body component (2), distributing valve (6), rotary valve (7), electricity
It is constituted between the contact surface side and the inner wall of cover body component (2) of machine (12) and cylinder (13), distributing valve (6) and rotary valve (7)
Annular groove (23), it is characterised in that：Cover body component (2) at the annular groove (23) is equipped with the low pressure of connection annular groove (23)
The outlet end of gas vent (24), the low pressure exhaust hole (24) is connected by low pressure air suction pipeline (1b) with the low-pressure side of compressor
It connects；The rotary valve (7) is equipped with the low-pressure channel (73) that can be connected with annular groove (23), the low-pressure channel (73)
The other end is connected with the trough (71) on rotary valve (7) so that the air distribution hole on cover body stomata (21), distributing valve (6)
(63), trough (71), low-pressure channel (73), annular groove (23), low pressure exhaust hole (24) and low pressure air suction pipeline (1b) can
Form the low-pressure gas access of connection.
2. high reliability low temperature refrigeration machine according to claim 1, it is characterised in that：The low pressure exhaust hole (24) with
Air distribution hole (63), high pressure stomata (62) on distributing valve (6) are not connected to.
3. high reliability low temperature refrigeration machine according to claim 1 or 2, it is characterised in that：The low pressure exhaust hole
(24) axis parallel is in the central axes of distributing valve (6).
4. high reliability low temperature refrigeration machine according to claim 1 or 2, it is characterised in that：The low pressure exhaust hole
(24) both sides of distributing valve (6) are separately positioned on cover body stomata (21).
5. high reliability low temperature refrigeration machine according to claim 1 or 2, it is characterised in that：The low pressure exhaust hole
(24) vertically it is arranged with annular groove (23), and the connectivity part of the two is located in the middle part of the vallecular cavity of annular groove (23).
6. high reliability low temperature refrigeration machine according to claim 1, it is characterised in that：The trough (71) axially passes through
Rotary valve (7) is worn, so that trough (71) can be connected to closed low pressure chamber on annular groove (23) and cover body component (2)
(22)。
7. high reliability low temperature refrigeration machine according to claim 1 or 6, it is characterised in that：The low-pressure channel (73)
Distributing valve (6) is biased to perpendicular to the junction of trough (71) setting and the two to be arranged.
8. high reliability low temperature refrigeration machine according to claim 7, it is characterised in that：The section of the low-pressure channel (73)
It is L-shaped.
9. high reliability low temperature refrigeration machine according to claim 1, it is characterised in that：The diverter surface of the rotary valve (7)
(75) the distribution face (61) of rotation reference face (74) setting and/or distributing valve (6) that protrude from rotary valve (7) protrudes from distributing valve
(6) distribution reference plane (64) setting, to increase the volume of annular groove (23).
10. high reliability low temperature refrigeration machine according to claim 1, it is characterised in that：The refrigeration machine includes lucky good fortune
Moral-McMahon type refrigeration machine, Sol text refrigeration machine, vascular refrigerator.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810566127.8A CN108645070B (en) | 2018-06-04 | 2018-06-04 | High-reliability low-temperature refrigerator |
| PCT/CN2018/099430 WO2019232918A1 (en) | 2018-06-04 | 2018-08-08 | High-reliability low-temperature refrigerating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810566127.8A CN108645070B (en) | 2018-06-04 | 2018-06-04 | High-reliability low-temperature refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108645070A true CN108645070A (en) | 2018-10-12 |
| CN108645070B CN108645070B (en) | 2023-08-29 |
Family
ID=63759431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810566127.8A Active CN108645070B (en) | 2018-06-04 | 2018-06-04 | High-reliability low-temperature refrigerator |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108645070B (en) |
| WO (1) | WO2019232918A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413918A (en) * | 2020-11-09 | 2021-02-26 | 深圳供电局有限公司 | Low-temperature refrigerator |
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|---|---|---|---|---|
| CN112413918A (en) * | 2020-11-09 | 2021-02-26 | 深圳供电局有限公司 | Low-temperature refrigerator |
| CN112413918B (en) * | 2020-11-09 | 2023-07-25 | 深圳供电局有限公司 | Low-temperature refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108645070B (en) | 2023-08-29 |
| WO2019232918A1 (en) | 2019-12-12 |
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