CN109453556A - A kind of equipment that can extract underground water heat - Google Patents
A kind of equipment that can extract underground water heat Download PDFInfo
- Publication number
- CN109453556A CN109453556A CN201811460653.2A CN201811460653A CN109453556A CN 109453556 A CN109453556 A CN 109453556A CN 201811460653 A CN201811460653 A CN 201811460653A CN 109453556 A CN109453556 A CN 109453556A
- Authority
- CN
- China
- Prior art keywords
- end cap
- bucket
- support rod
- rose box
- underground water
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000000284 extract Substances 0.000 title claims abstract description 16
- 241000220317 Rosa Species 0.000 claims abstract description 36
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
The present invention provides a kind of equipment that can extract underground water heat.The equipment that underground water heat can be extracted includes angle adjustment mechanism, two filter structures, flow control structure, rotary joint and inlet tube；The angle adjustment mechanism includes gag lever post, fixed block, shaft and support rod, the support rod between the shaft and the fixed block by being rotatablely connected, the fixed block is equipped with the gag lever post for being limited to the shaft, two filter structures for filter water source are symmetrically set in the support rod, the filter structure includes end cap, bucket and Rose Box, two end caps are symmetrically set in the support rod, the Rose Box for filtering scrap is fixed on the end cap, it is threadedly coupled between the bucket and the end cap, the Rose Box is set to the inside of the bucket.The equipment provided by the invention that underground water heat can be extracted has the advantages that expense bits sandstone filter efficiency is high, repair and maintenance is convenient.
Description
Technical field
The present invention relates to underground heat equipment technical fields, more particularly to a kind of equipment that can extract underground water heat.
Background technique
Geothermal energy is the natural thermal energy extracted by the earth's crust, and geothermal energy can be transformed into electric energy on the spot, followed by directly to production
Process flow heat supply, such as cooking of pulp, evaporation preparing salt by working up seawater, sea water desalination, all kinds of raw material and product drying food and sugar
Purification, petroleum refining, production heavy water, refrigeration and air-conditioning etc.；It can also be to living facilities heat supply and agriculture heat, in underground hydro-thermal
Usually heat is extracted in such a way that water-bath exchanges heat in the extraction process of amount, is needed in water-bath heat transfer process to underground
Water flow is filtered, and avoids causing heat exchange equipment to block in heat transfer process.
However traditional equipment that can extract underground water heat is not easy to quickly dismantle, clears up filter mechanism, operation
Flexibility is poor, needs to stop the conveying of water flow in cleaning and maintenance filter mechanism, and filter efficiency is low.
Therefore, it is necessary to provide a kind of new equipment solution above-mentioned technical problem that can extract underground water heat.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of expense bits sandstone filter efficiencies, and high, repair and maintenance can easily mention
The equipment for taking underground water heat.
In order to solve the above technical problems, the equipment provided by the invention that can extract underground water heat includes: angular adjustment
Structure, the angle adjustment mechanism include gag lever post, fixed block, shaft and support rod, the support rod by the shaft with
It is rotatablely connected between the fixed block, the fixed block is equipped with the gag lever post for being limited to the shaft；Two
A filter structure, two filter structures for filter water source are symmetrically set in the support rod, and the filter structure includes
End cap, bucket and Rose Box, two end caps are symmetrically set in the support rod, and the Rose Box for filtering scrap is solid
It due to the end cap, is threadedly coupled between the bucket of scrap and the end cap for storing, the Rose Box is set to institute
State the inside of bucket；Flow control structure, the flow control structure for controlling the rate of filtration are fixed on the end cap,
The flow control structure includes two connecting tubes, water valve and tee tube, two connecting tubes on the same end cap
One end extends respectively to the inside of the bucket and the Rose Box, and the connecting tube is equipped with institute away from one end of the end cap
Water valve is stated, and the water valve of the same side on two end caps is connected to the tee tube；Rotary joint, the rotation connect
It is rotatablely connected between head and the tee tube, and is embedded in the inside of the shaft close to the rotary joint of the fixed block,
The rotation center of the rotation center of the rotary joint and the support rod is on same straight line；Inlet tube, the inlet tube
Engage with the rotary joint inside the shaft.
Preferably, the gag lever post is " 7 " character form structure, and the cross section of the gag lever post is ellipse.
Preferably, the width of the support rod is equal with the width of the fixed block, and the width of the support rod and institute
The diameter for stating end cap is equal.
Preferably, it is threadedly coupled between the end cap and the Rose Box, and the cross section of the Rose Box is waveform
Structure.
Preferably, the connecting tube of the inside of the bucket and the Rose Box is all extended to away from the end cap
One end, and the connecting tube engages with the water valve.
Preferably, the end cap is equipped with sealing ring for being sealed to the bucket, and the sealing ring with
The bucket contradicts.
Preferably, it is limited away from a rotary joint of the shaft by fixed link, the fixed link is " 7 " word
Shape structure, and the width of the fixed link is equal with the diameter of the bucket.
Compared with the relevant technologies, the equipment provided by the invention that can extract underground water heat has following beneficial to effect
Fruit:
The present invention provides a kind of equipment that can extract underground water heat, and the end symmetric of the support rod sets that there are two institutes
End cap is stated, is respectively used to feed liquor and the connecting tube for drain, the end of the connecting tube there are two on the end cap
Portion is equipped with the water valve, and the end of two connecting tubes of same function is connected by the tee tube, described in cleaning maintenance
When filter structure, the water valve in the connecting tube on the end cap for the bottom end for being connected to the support rod is opened, together
When close the water valve in the connecting tube on another described end cap, water flow is described by the support rod bottom end
Filter structure filters underground heat water flow, extracts the gag lever post, rotates the support rod, the shaft on the support rod is around institute
It states fixed block and rotates 180 °, the tee tube and the rotary joint are rotatablely connected, and are made symmetrically arranged two on the support rod
A filter structure exchanges up and down, while being threadedly coupled between the bucket and the Rose Box, makes described in installing and dismounting
Bucket is more convenient, stops when keeping waste scrap more convenient, while avoiding the filter structure described in clean and maintenance
The conveying of sealing stream substantially increases the filter efficiency and its quality at water source.
Detailed description of the invention
Fig. 1 is a kind of structural representation of preferred embodiment of the equipment provided by the invention that can extract underground water heat
Figure；
Fig. 2 is the portion A shown in FIG. 1 enlarged diagram；
Fig. 3 is the attachment structure schematic diagram of angle adjustment mechanism shown in Fig. 2 and flow control structure；
Fig. 4 is the portion B shown in Fig. 3 enlarged diagram.
Figure label: 1, angle adjustment mechanism, 11, gag lever post, 12, fixed block, 13, shaft, 14, support rod, 2, fixation
Bar, 3, flow control structure, 31, connecting tube, 32, water valve, 33, tee tube, 4, rotary joint, 5, filter structure, 51, end cap,
52, bucket, 53, Rose Box, 6, inlet tube, 7, sealing ring.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
Please refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, wherein Fig. 1 is the underground water heat provided by the invention of capable of extracting
A kind of structural schematic diagram of preferred embodiment of equipment；Fig. 2 is the portion A shown in FIG. 1 enlarged diagram；Fig. 3 is shown in Fig. 2
The attachment structure schematic diagram of angle adjustment mechanism and flow control structure；Fig. 4 is the portion B shown in Fig. 3 enlarged diagram.It can mention
The equipment for taking underground water heat includes: angle adjustment mechanism 1, the angle adjustment mechanism 1 include gag lever post 11, fixed block 12,
Shaft 13 and support rod 14, the support rod 14 are described solid by being rotatablely connected between the shaft 13 and the fixed block 12
Block 12 is determined equipped with the gag lever post 11 for being limited to the shaft 13；Two filter structures 5, two for filtering
The filter structure 5 at water source is symmetrically set in the support rod 14, and the filter structure 5 includes end cap 51, bucket 52 and mistake
Filter box 53, two end caps 51 are symmetrically set in the support rod 14, and the Rose Box 53 for filtering scrap is fixed on institute
End cap 51 is stated, is threadedly coupled between the bucket 52 of scrap and the end cap 51 for storing, the Rose Box 53 is set to
The inside of the bucket 52；Flow control structure 3, the flow control structure 3 for controlling the rate of filtration are fixed on institute
State end cap 51, the flow control structure 3 includes two connecting tubes 31, water valve 32 and tee tube 33, on the same end cap 51
One end of two connecting tubes 31 extend respectively to the inside of the bucket 52 and the Rose Box 53, the connecting tube
31 are equipped with the water valve 32 away from one end of the end cap 51, and the water valve 32 of the same side on two end caps 51 connects
It is connected to the tee tube 33；Rotary joint 4 is rotatablely connected between the rotary joint 4 and the tee tube 33, and close to institute
The rotary joint 4 for stating fixed block 12 is embedded in the inside of the shaft 13, the rotation center of the rotary joint 4 and the branch
The rotation center of strut 14 is on same straight line；Inlet tube 6, the inlet tube 6 and the rotation inside the shaft 13
Connector 4 engages.
In the specific implementation process, as shown in Fig. 2, the gag lever post 11 is " 7 " character form structure, and the gag lever post 11
Cross section is ellipse；The gag lever post 11 is " 7 " character form structure, improves the operating flexibility of the gag lever post 11 and its relaxes
Appropriateness.
Referring to fig. 1 and fig. 2, the width of the support rod 14 is equal with the width of the fixed block 12, and the branch
The width of strut 14 is equal with the diameter of the end cap 51, in order to keep structure more reasonable, enhances the end cap 51 and the branch
The stability that strut 14 connects.
Shown in referring to figs. 2 and 3, it is threadedly coupled between the end cap 51 and the Rose Box 53, and the Rose Box 53
Cross section be wavy shaped configuration；The cross section of the Rose Box 53 is wavy shaped configuration, increases the contact area with water source,
The anti-blocking performance and its strainability of the Rose Box 53 are substantially increased, while between the Rose Box 53 and the end cap 51
It is threadedly coupled, keeps Rose Box 53 described in installing and dismounting more convenient.
Shown in referring to figs. 2 and 3, the connecting tube 31 of the inside of the bucket 52 and the Rose Box 53 extends
To the one end for deviating from the end cap 51, and the connecting tube 31 engages with the water valve 32, for the ease of scrap gravity work
It is deposited under close to one end of the end cap 51, improves filter effect.
Refering to what is shown in Fig. 1, the end cap 51 is equipped with the sealing ring 7 for being sealed to the bucket 52, and institute
It states sealing ring 7 and the bucket 52 contradicts；In order to improve the leakproofness between the bucket 52 and the end cap 51, make to pacify
It is more convenient to fill the bucket 52.
Referring to fig. 1 and fig. 2, it is limited away from a rotary joint 4 of the shaft 13 by fixed link 2, institute
Stating fixed link 2 is " 7 " character form structure, and the width of the fixed link 2 is equal with the diameter of the bucket 52, for the ease of solid
The fixed rotary joint 4.
The working principle of the equipment provided by the invention that underground water heat can be extracted is as follows:
The fixed link 2 is bolted on the shell of heat exchange equipment with the fixed block 12 first, it will be described
Inlet tube 6 is connected in the pipeline of heat exchange equipment, and a rotary joint 4 for being fixed on the fixed link 2 is connected to the ground
Lower hot water pipeline closes two water valves 32 on the end cap 51 of 14 bottom end of support rod, opens the support rod
Two water valves 32 on the end cap 51 on 14 tops, GEOTHERMAL WATER stream is by the rotary joint in the fixed link 2
4 pass through the tee tube 33, enter institute in the connecting tube 31 that the end cap 51 extends to the bucket 52 by conducting
The inside of bucket 52 is stated, the slag that takes in hot water is filtered by the Rose Box 53 that cross section is wavy shaped configuration, makes waste residue
It is trapped in the inside of the bucket 52, hot water passes through the water valve 32 from the threeway from the connecting tube 31 for drain
Pipe 33, the rotary joint 4 are emitted into the inlet tube 6, and the cross section of the Rose Box 53 is wavy shaped configuration, are increased
With the contact area at water source, the anti-blocking performance and its strainability of the Rose Box 53, while the Rose Box are substantially increased
It is threadedly coupled between 53 and the end cap 51, keeps Rose Box 53 described in installing and dismounting more convenient, the mistake is overhauled in cleaning
When filtering structure 5, the water in the connecting tube 31 on the end cap 51 for the bottom end for being connected to the support rod 14 is opened
Valve 32, simultaneously closes off the water valve 32 in the connecting tube 31 on another described end cap 51, and water flow passes through the branch
The filter structure 5 of 14 bottom end of strut filters underground heat water flow, extracts the gag lever post 11, and the gag lever post 11 is " 7 " font
Structure improves the operating flexibility and its comfort level of the gag lever post 11, rotates the support rod 14, on the support rod 14
The shaft 13 around the fixed block 12 rotate 180 °, then by the gag lever post 11 through the fixed block 12 with it is described
Shaft 13 engages, and the tee tube 33 is rotatablely connected with the rotary joint 4, makes symmetrically arranged two on the support rod 14
A about 5 filter structure exchanges, while being threadedly coupled between the bucket 52 and the Rose Box 53, makes installing and dismounting
The bucket 52 is more convenient, keeps waste scrap more convenient, while avoiding the filter structure 5 described in clean and maintenance
When stop water flow conveying, substantially increase the filter efficiency and its quality at water source.
Compared with the relevant technologies, the equipment provided by the invention that can extract underground water heat has following beneficial to effect
Fruit:
The present invention provides a kind of equipment that can extract underground water heat, there are two the end symmetric of the support rod 14 is set
The end cap 51, through there are two be respectively used to feed liquor and the connecting tube 31 for drain, the company on the end cap 51
The end of adapter tube 31 is equipped with the water valve 32, and the end of the connecting tube 31 of two of same function is connected by the tee tube 33
It connects, when the filter structure 5 is overhauled in cleaning, opens the company on the end cap 51 for the bottom end for being connected to the support rod 14
The water valve 32 on adapter tube 31 simultaneously closes off the water valve in the connecting tube 31 on another described end cap 51
32, water flow filters underground heat water flow by the filter structure 5 of 14 bottom end of support rod, extracts the gag lever post 11, rotates
The support rod 14, the shaft 13 on the support rod 14 rotate 180 ° around the fixed block 12, the tee tube 33 with
The rotary joint 4 is rotatablely connected, and exchanges symmetrically arranged two about 5 filter structures on the support rod 14, together
It is threadedly coupled between Shi Suoshu bucket 52 and the Rose Box 53, keeps bucket 52 described in installing and dismounting more convenient,
The conveying for stopping water flow when keeping waste scrap more convenient, while avoiding filter structure 5 described in clean and maintenance, mentions significantly
The high filter efficiency and its quality at water source.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (7)
1. the equipment that one kind can extract underground water heat characterized by comprising
Angle adjustment mechanism (1), the angle adjustment mechanism (1) include gag lever post (11), fixed block (12), shaft (13) and branch
Strut (14), the support rod (14) between the shaft (13) and the fixed block (12) by being rotatablely connected, the fixation
Block (12) is equipped with the gag lever post (11) for being limited to the shaft (13)；
Two filter structures (5), two filter structures (5) for filter water source are symmetrically set in the support rod (14),
The filter structure (5) includes end cap (51), bucket (52) and Rose Box (53), and two end caps (51) are symmetrically set in institute
Support rod (14) are stated, the Rose Box (53) for filtering scrap is fixed on the end cap (51), for storing the institute of scrap
It states and is threadedly coupled between bucket (52) and the end cap (51), the Rose Box (53) is set to the interior of the bucket (52)
Portion；
Flow control structure (3), the flow control structure (3) for controlling the rate of filtration are fixed on the end cap (51),
The flow control structure (3) includes two connecting tubes (31), water valve (32) and tee tube (33), on the same end cap (51)
One end of two connecting tubes (31) extend respectively to the inside of the bucket (52) and the Rose Box (53), it is described
Connecting tube (31) is equipped with the water valve (32) away from the one end of the end cap (51), and the same side on two end caps (51)
The water valve (32) be connected to the tee tube (33)；
Rotary joint (4) is rotatablely connected between the rotary joint (4) and the tee tube (33), and close to the fixed block
(12) the rotary joint (4) is embedded in the inside of the shaft (13), the rotation center of the rotary joint (4) and the branch
The rotation center of strut (14) is on same straight line；
Inlet tube (6), the inlet tube (6) rotary joint (4) internal with the shaft (13) engage.
2. the equipment according to claim 1 that underground water heat can be extracted, which is characterized in that the gag lever post (11) is
" 7 " character form structure, and the cross section of the gag lever post (11) is ellipse.
3. the equipment according to claim 1 that underground water heat can be extracted, which is characterized in that the support rod (14)
Width is equal with the width of the fixed block (12), and the diameter phase of the width of the support rod (14) and the end cap (51)
Deng.
4. the equipment according to claim 3 that underground water heat can be extracted, which is characterized in that the end cap (51) and institute
It states and is threadedly coupled between Rose Box (53), and the cross section of the Rose Box (53) is wavy shaped configuration.
5. the equipment according to claim 1 that underground water heat can be extracted, which is characterized in that the bucket (52) and
The connecting tube (31) of the inside of the Rose Box (53) all extends to one end away from the end cap (51), and the connection
Pipe (31) engages with the water valve (32).
6. the equipment according to claim 1 that underground water heat can be extracted, which is characterized in that set on the end cap (51)
There is the sealing ring (7) for being sealed to the bucket (52), and the sealing ring (7) is supported with the bucket (52)
Touching.
7. the equipment according to claim 1 that underground water heat can be extracted, which is characterized in that deviate from the shaft (13)
A rotary joint (4) limited by fixed link (2), the fixed link (2) is " 7 " character form structure, and the fixation
The width of bar (2) is equal with the diameter of the bucket (52).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811460653.2A CN109453556B (en) | 2018-12-01 | 2018-12-01 | Equipment capable of extracting heat of underground water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811460653.2A CN109453556B (en) | 2018-12-01 | 2018-12-01 | Equipment capable of extracting heat of underground water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109453556A true CN109453556A (en) | 2019-03-12 |
| CN109453556B CN109453556B (en) | 2021-04-13 |
Family
ID=65612201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811460653.2A Active CN109453556B (en) | 2018-12-01 | 2018-12-01 | Equipment capable of extracting heat of underground water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109453556B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201930659U (en) * | 2011-01-05 | 2011-08-17 | 上海科庆自动化设备有限公司 | Alternatively-used double air filters with three-position two-way plane capable of rotating and exchanging |
| CN202010472U (en) * | 2011-04-06 | 2011-10-19 | 张晓荣 | Seawater pipeline filter |
| CN204910981U (en) * | 2015-09-01 | 2015-12-30 | 江苏神通阀门股份有限公司 | Pit filter |
| JP2017114536A (en) * | 2015-12-25 | 2017-06-29 | エア・ウォーター株式会社 | Drinking water dispenser |
| CN207071269U (en) * | 2017-07-13 | 2018-03-06 | 天津市郁峰化工有限公司 | Anti-clogging connecting tube in a kind of calcium hypochlorite production |
-
2018
- 2018-12-01 CN CN201811460653.2A patent/CN109453556B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201930659U (en) * | 2011-01-05 | 2011-08-17 | 上海科庆自动化设备有限公司 | Alternatively-used double air filters with three-position two-way plane capable of rotating and exchanging |
| CN202010472U (en) * | 2011-04-06 | 2011-10-19 | 张晓荣 | Seawater pipeline filter |
| CN204910981U (en) * | 2015-09-01 | 2015-12-30 | 江苏神通阀门股份有限公司 | Pit filter |
| JP2017114536A (en) * | 2015-12-25 | 2017-06-29 | エア・ウォーター株式会社 | Drinking water dispenser |
| CN207071269U (en) * | 2017-07-13 | 2018-03-06 | 天津市郁峰化工有限公司 | Anti-clogging connecting tube in a kind of calcium hypochlorite production |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109453556B (en) | 2021-04-13 |
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