CN107255369B - Composite getter for metal straight-through solar vacuum tube - Google Patents
Composite getter for metal straight-through solar vacuum tube Download PDFInfo
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- CN107255369B CN107255369B CN201710622066.8A CN201710622066A CN107255369B CN 107255369 B CN107255369 B CN 107255369B CN 201710622066 A CN201710622066 A CN 201710622066A CN 107255369 B CN107255369 B CN 107255369B
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
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Abstract
The invention discloses a composite getter for a metal straight-through solar vacuum tube, which comprises an evapotranspiration type getter, a non-evapotranspiration type getter and a getter bracket, wherein the evapotranspiration type getter is connected with the non-evapotranspiration type getter through the getter bracket, and the evapotranspiration type getter and the non-evapotranspiration type getter are concentrically arranged; the evaporable getter comprises a ring and evaporable getter alloy powder, the ring comprises an inner ring and an outer ring, the inner ring is arranged in the outer ring, the top end of the inner ring and the top end of the outer ring are connected with each other to form a C-shaped cavity with an opening at the bottom end, and the evaporable getter alloy powder is pressed in the C-shaped cavity between the inner ring and the outer ring; the invention has the advantages of large extraction quantity and long service life, thereby effectively ensuring the vacuum degree of the interlayer, and simultaneously, as the evapotranspiration type getter adopts the ring with large diameter as a carrier, the generated barium film can be uniformly formed on the inner surface of the tube, and the local periphery of the corrugated tube in the straight-through metal tube is shielded, thereby playing a good role in the vacuum display of the heat collecting tube.
Description
Technical Field
The invention relates to a getter, in particular to a composite getter for a metal straight-through solar vacuum tube.
Background
In the prior art, the only standard for judging the vacuum degree in a tube by a general metal straight-through solar vacuum tube is that a vacuum getter evapotranspiration barium film with the size of about 2 square centimeters is added in the center of the inner wall of the tube to display that the original getter of the metal straight-through vacuum tube indicates that the mirror area of the evapotranspiration barium film is small, the capability of adsorbing gases such as hydrogen, nitrogen and the like in the tube is weak, and the mirror surface of the barium film is easy to disappear, so that the suction capability of a chemical mode is lost, and the vacuum degree in the tube is reduced along with the increase of time.
Disclosure of Invention
The invention aims to solve the technical problems of providing a composite getter for a metal straight-through solar vacuum tube with higher installation performance and adsorption performance aiming at the defects of the prior art, and the composite getter for the metal straight-through solar vacuum tube has stable manufacturing performance, good consistency of barium yield, large extraction amount in the evaporation process and suitability for mass production
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the composite getter comprises an evaporable getter, a non-evaporable getter and a getter bracket, wherein the evaporable getter is connected with the non-evaporable getter through the getter bracket, and the evaporable getter and the non-evaporable getter are concentrically arranged.
As a further improved technical scheme of the invention, the evaporable getter comprises a ring and an evaporable getter alloy powder, the ring comprises an inner ring and an outer ring, the inner ring is arranged inside the outer ring, the top end of the inner ring and the top end of the outer ring are mutually connected to form a C-shaped cavity with an open bottom end, the evaporable getter alloy powder is pressed in the C-shaped cavity between the inner ring and the outer ring, and the height of the evaporable getter alloy powder is smaller than the depth of the C-shaped cavity.
As a further improved technical scheme of the invention, the evaporable getter alloy powder comprises barium aluminum powder and nickel powder.
As a further improved technical scheme of the invention, the proportion of the barium aluminum powder to the nickel powder in the evaporable getter alloy powder is 1:1, and the barium aluminum powder comprises 53.5% of barium and 46.5% of aluminum.
As a further improved technical scheme of the invention, the non-evaporable getter comprises a non-evaporable getter strip, a non-evaporable getter support and a non-evaporable getter retainer ring, wherein the non-evaporable getter strip is wrapped on the outer circular surface of the non-evaporable getter support, the non-evaporable getter retainer ring is sleeved on the outer surface of the non-evaporable getter strip, and the non-evaporable getter retainer ring is fixedly connected with the non-evaporable getter support.
As a further improved technical scheme of the invention, the non-evaporable getter bracket comprises an outer circular straight edge section, a bottom flat edge section and an outer circular flanging section which are sequentially connected from top to bottom, wherein the outer circular straight edge section, the bottom flat edge section and the outer circular flanging section are of an integrated structure, a plurality of circumferential holes are formed in the surface of the bottom flat edge section, and the non-evaporable getter strip is wrapped on the middle lower part of the outer circular straight edge section and the upper surface of the bottom flat edge section.
As a further improved technical scheme of the invention, the non-evaporable getter strip comprises a base band and a non-evaporable getter alloy powder cake, the non-evaporable getter alloy powder cake is pressed on the front side and the back side of the base band, the non-evaporable getter strip is formed by winding the base band pressed with the non-evaporable getter alloy powder cake, and the expansion length of the base band is 1 m-10 m.
As a further improved technical solution of the present invention, the non-evaporable getter alloy compact comprises zirconium, vanadium and iron.
As a further improved technical scheme of the invention, the non-evaporable getter alloy powder cake is formed by pressing 72% of zirconium and 28% of vanadium and iron through a vacuum powder smelting method and a ball milling powder making method.
According to the technical scheme of the invention, the number of the getter supports is 2, the getter supports are L-shaped stainless steel strips, one ends of the L-shaped stainless steel strips are connected with the evaporable getters, the other ends of the L-shaped stainless steel strips are connected with the non-evaporable getters, the non-evaporable getters and the cover glass tubes of the metal through solar vacuum tube are arranged concentrically, the evaporable getters and the non-evaporable getters are fixed on the through metal tubes inside the cover glass tubes in a welding mode, and the vertical distance between the outer ring of the ring and the cover glass tubes is 0.5-15 mm.
Compared with the prior art, the invention has the following beneficial effects:
the composite getter used in the invention improves the air extraction rate and the air extraction quantity of the product, the ring is more beneficial to the evapotranspiration activation of the barium film in the vacuum tube, and meanwhile, the vacuum degree in the interlayer of the vacuum tube can be maintained for a long time by adopting the composite getter, the vacuum performance between the interlayers of the heat collecting tube is improved, and the service life of the vacuum tube is prolonged by more than 20 years. The invention has the advantages of large extraction quantity and long service life, thereby effectively ensuring the vacuum degree of the interlayer, and simultaneously, as the evapotranspiration type getter adopts the ring with large diameter as a carrier, the generated barium film can be uniformly formed on the inner surface of the tube, the local periphery of the corrugated tube in the straight-through metal tube is shielded, and the high-frequency evapotranspiration barium film in the area space of the corrugated tube is utilized, so that the space of the inner tube surface of the heat absorption tube is not occupied. Meanwhile, the barium film mirror mask is not visible outside the outer surface of the corrugated pipe. The light at the original corrugated pipe is reflected back by the barium film, the heat at the corrugated pipe joint is reduced, and the corrugated pipe and the sealing joint are effectively protected. The barium film mirror surface plays a good role in vacuum display of the metal straight-through solar vacuum tube, and whether the inside of the cover glass tube is vacuum or not can be judged through the color of the barium film mirror surface. The invention utilizes the large-area barium film of the evaporable getter to effectively treat gases such as hydrogen, nitrogen and the like in the vacuum tube in a chemical way for a long time, and simultaneously the non-evaporable getter adopts a physical way to absorb a large amount of gases, thereby achieving high pumping speed and pumping quantity and ensuring the vacuum degree in the tube stably for a long time.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the ring according to the present invention.
Fig. 3 is an enlarged view of a portion of the collar and the evaporable getter alloy powder of fig. 2.
FIG. 4 is a schematic structural view of a non-evaporable getter of the present invention.
Fig. 5 is a schematic view of a winding of a non-evaporable getter strip according to the invention.
Fig. 6 is a schematic illustration of the components of a non-evaporable getter support of the invention.
Fig. 7 is a comparative schematic diagram of a prior art non-evaporable getter and a non-evaporable getter of the present invention.
Fig. 8 is a comparative schematic diagram of a conventional vacuum getter and a composite getter according to the present invention.
Fig. 9 is a schematic diagram showing the comparison of the spraying directions of the prior art evaporable getter and the evaporable getter of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to fig. 1 and 9:
the invention adopts a composite getter, the large-area barium film 20 of the evaporable getter can effectively treat gases such as hydrogen, nitrogen and the like in a vacuum tube in a chemical way for a long time, and meanwhile, the non-evaporable getter 2 adopts a physical way (the solid oxide film on the surface of the getter is decomposed into a product of metal and gas when the getter is vacuumized, and the product diffuses into the body to generate a highly active clean metal surface which reacts with the gas to play a role of gettering), thereby achieving a large pumping speed and pumping quantity, ensuring the vacuum degree in the tube stably for a long time, and the service life of the metal straight-through vacuum tube adopting the large-area getter barium film 20 is more than 20 years. The specific technical scheme is as follows:
referring to fig. 1, a composite getter for a metal straight-through solar vacuum tube comprises an evaporable getter 1, a non-evaporable getter 2 and a getter bracket 3, wherein the bottom end of the evaporable getter 1 is connected with the top end of the non-evaporable getter 2 through the getter bracket 3, and the evaporable getter 1 and the non-evaporable getter 2 are concentrically arranged. Referring to fig. 1, the vertical distance G between the evaporable getter 1 and the non-evaporable getter 2 is 1 to 10mm. The bottom end of the evaporable getter 1 illustrated in the present embodiment is the left end surface of the evaporable getter 1 in fig. 1, and the top end of the non-evaporable getter 2 is the right end surface of the non-evaporable getter 2 in fig. 1, wherein the terms "top end", "bottom end" and the like may be changed according to different directions.
In this embodiment, referring to fig. 2 and 3, fig. 2 a is a cross-sectional view of A-A of b in fig. 2, the evaporable getter 1 includes a ring 4 and an evaporable getter alloy powder 7, the ring 4 includes an inner ring 5 and an outer ring 6, the inner ring 5 is disposed inside the outer ring 6, a top end (corresponding to a right end in a direction of a in fig. 2) of the inner ring 5 and a top end (corresponding to a right end in a direction of a in fig. 2) of the outer ring 6 are connected to each other to form a C-shaped cavity with an open bottom end, the evaporable getter alloy powder 7 is pressed in the C-shaped cavity between the inner ring 5 and the outer ring 6, a height of the evaporable getter alloy powder 7 is smaller than a depth of the C-shaped cavity, and the evaporable getter alloy powder 7 is embedded between the inner ring 5 and the outer ring 6 in fig. 3, and an H size is 1.5 to 2mm.
In this embodiment, the evaporable getter alloy powder 7 includes barium aluminum powder and nickel powder.
In this embodiment, the ratio of the barium aluminum powder to the nickel powder in the evaporable getter alloy powder 7 is 1:1, and the barium aluminum powder includes 53.5% of barium and 46.5% of aluminum. The preparation method preferably comprises the following steps: taking 53.5% of raw material barium and 46.5% of aluminum, vacuum smelting, ball milling to prepare powder, and vacuum mixing with metal nickel powder in a ratio of 1:1; the ring is formed by stamping parts; then the special compound type macrocyclic barium aluminum nickel alloy getter for the metal straight-through solar vacuum heat collecting tube is manufactured by the alloy powder cold isostatic pressing process. The external dimensions and technical parameters of the evaporable getter 1 are shown in the table one.
Table one: the external dimension and the technical parameters of the evaporable getter are as follows.
In this embodiment, referring to fig. 4, the non-evaporable getter 2 includes a non-evaporable getter strip 8, a non-evaporable getter support 9, and a non-evaporable getter retainer ring 10, where the non-evaporable getter strip 8 is wrapped around an outer circumferential surface of the non-evaporable getter support 9, and the non-evaporable getter retainer ring 10 is sleeved on an outer surface of the non-evaporable getter strip 8 and the non-evaporable getter retainer ring 10 is fixedly connected with the non-evaporable getter support 9. The non-evaporable getter collar 10 is used to prevent the vacuum barium film 20 from being sprayed onto the surface of the non-evaporable getter strip 8 when the evaporable getter 1 is activated. Fig. 5 is a schematic structural view of a non-evaporable getter strip 8.
In this embodiment, referring to fig. 6, fig. a is a top view of fig. b in fig. 6, the non-evaporable getter bracket 9 includes an outer circular straight edge section 11, a bottom flat edge section 12 and an outer circular flanging section 13 which are sequentially connected from top to bottom, the outer circular straight edge section 11, the bottom flat edge section 12 and the outer circular flanging section 13 are in an integral structure, a plurality of circumferential holes 14 are formed on the surface of the bottom flat edge section 12, and the non-evaporable getter strip 8 is wrapped under the middle of the outer circular straight edge section 11 and on the upper surface of the bottom flat edge section 12. The circumferential holes 14 have the effect of increasing the flow passage area between the non-evaporable getter strips 8 and the outside, which is more beneficial for the discharged gas of the non-evaporable getter strips 8 to flow out during the exhaust, and the non-evaporable getter strips 8 can absorb impurity gas conveniently through the flow passages of the circumferential holes 14 after the vacuum is formed in the tube. The circumferential holes 14 are used for pumping the non-evaporable getter 2 to enhance the pumping effect.
In this embodiment, referring to fig. 7 b, the upper view of fig. 7 b is a top view of the lower view, the non-evaporable getter strip 8 includes a base tape 15 and a non-evaporable getter alloy compact 16, the non-evaporable getter alloy compact 16 is pressed on both sides of the base tape 15, the non-evaporable getter strip 8 is formed by winding the base tape 15 on which the non-evaporable getter alloy compact 16 is pressed, and the spreading length of the base tape 15 is 1m to 10m. As shown in fig. 5, the non-evaporable getter 2 is in the form of a strip, and the non-evaporable getter strip 8 is rolled into a loop. This increases the getter surface area of the non-evaporable getter alloy compact 16, the plurality of circumferential holes 14 provided in the surface of the bottom flat side 12 of the non-evaporable getter support 9 promote an exposed surface area of the non-evaporable getter strips 8 of 120-160 cm 2 The area is 15-20 times of that of all getters (taking 18 grains of 45A getters as an example) in the conventional scheme; the alloy weight of the getter reaches 6-14 g, which is more than 3 times of that of the conventional getter. The air suction rate is 15-20 times of the common air suction rate, and the air suction rate is increased on the premise of ensuring the total air suction amount.
In this embodiment, the non-evaporable getter alloy compact 16 includes zirconium, vanadium, and iron.
In this example, the non-evaporable getter alloy compact 16 is pressed from 72% zirconium and 28% vanadium and iron by vacuum powder melting and ball milling. The preparation method preferably comprises the following steps: zirconium 72%, vanadium and iron accounting for 28%, through vacuum powder smelting, ball milling powder pressing; then the special compound type macrocyclic barium aluminum nickel alloy getter for the metal straight-through solar vacuum heat collecting tube is manufactured by the alloy powder cold isostatic pressing process. The external dimensions and technical parameters of the non-evaporable getter 2 are shown in Table III.
The suction surface area of the common non-evaporable getter in the market is very small, the suction powder cake can only be compressed in a small-diameter ring, the non-evaporable getter 2 of the invention adopts a strip form, the suction powder cake is pressed on the front and back sides (the non-evaporable getter alloy powder cake 16 is pressed on the front and back sides of a base band), the suction surface area is greatly improved, the gas in a pipe can be quickly and effectively absorbed, and the suction speed and the suction quantity are larger than those of common products in the market.
Table three: the non-evaporable getter of the invention has external dimensions and activation conditions.
In this embodiment, the number of the getter holders 3 is 2, the getter holders 3 are L-shaped stainless steel strips, one ends of the L-shaped stainless steel strips are connected with the evaporable getter 1 and the other ends thereof are connected with the non-evaporable getter 2, see b diagram in fig. 8 or b diagram in fig. 9, the evaporable getter 1, the non-evaporable getter 2 and the cover glass tube 22 of the metal through solar vacuum tube are concentrically arranged, the evaporable getter 1 and the non-evaporable getter 2 are fixed on the through metal tube 21 positioned inside the cover glass tube 22 by welding, and the vertical distance L between the outer ring 6 of the ring 4 and the cover glass tube 22 is 0.5-15 mm (see b in fig. 8).
The principle of the invention is as follows: by the large area getter ring 4, the evaporable getter 1 is activated during the venting of the through metal tube 21, thereby forming a double mirror barium film 20 on the inner surface of the cover glass tube 22 and the bellows 23, so that the vacuum in the cover glass tube 22 reaches 5 x 10 -6 pa or more. The transpiration surface is more than 20 times of that of the conventional product. Therefore, the barium evaporable getter 1 used in the metal straight-through solar vacuum heat collecting tube can well maintain the interlayer vacuum degree in the working process of the heat collecting tube.
While fig. 7 a and b show commercially available non-evaporable getters, it can be seen that the conventional non-evaporable getter (the conventional pill-type getter 17 shown in fig. 7 a and the conventional wafer getter 18 shown in fig. 7 b) has a very small getter surface area, and the getter wafer can only be compressed in a small diameter ring, and the non-evaporable getter 2 of the present invention (fig. 7 c) has a strip form, and the front and back sides of the metal strip (the base strip 15) are pressed with getter wafers (the non-evaporable getter alloy wafer 16), so that the getter surface area is greatly increased, and the gas in the tube can be rapidly and effectively absorbed, and the pumping speed and pumping quantity are higher than those of the conventional commercially available products.
Fig. 8 a shows a general vacuum gettering indicator, and fig. 8 b shows a getter barium film according to the present invention. The a-graph in fig. 8 evaporates a circle 19 of diameter 30 on the surface of the cover glass tube 22. The barium film 20 ejected from the evaporable getter 1 of the composite getter of the invention can shield the corrugated tube 23 in the tube to form a mirror barium film 20 with a cylindrical outer surface. The distance L between the evaporable getter 1 and the inner diameter of the cover glass tube 22 is 0.5mm to 15mm. The length M of the evapotranspiration mirror surface is 60-80 mm, and the effective area of the barium film 20 sprayed by the composite getter is 20 times of that of the common barium film;
referring to fig. 9, a in fig. 9 is a vacuum getter in the market, b in fig. 9 is a composite getter of the present invention, and it can be seen by comparing fig. 9 that the vacuum getter indicator of the prior art can only spray a small diameter barium film mirror surface on the inner tube surface of the cover glass tube 22, whereas the evapotranspiration type getter 1 of the present invention can spray a barium film 20 to cover the outer surface of the corrugated tube 23 and the inner surface of the cover glass tube 22, and the exposed barium film 20 has a large surface area and a stronger gettering capability. Where a in fig. 9 is the direction of ejection of the prior art evaporable getter and b in fig. 9 is the direction of ejection of the evaporable getter of the present invention.
According to the invention, a large-loop type evapotranspiration getter is activated by a high-frequency coil, a barium film 20 activated by the evapotranspiration getter 1 is sprayed out from an opening of a C-shaped cavity, the barium film 20 shields a corrugated pipe 23 in the pipe partially, and a double-mirror barium film is formed on the inner surface of a cover glass pipe 22 and the surface of the corrugated pipe 23. The spraying direction of the evaporable getter 1 of the composite getter is the pipe ends at two sides (spraying to the direction of the non-evaporable getter 2), the sprayed barium film 20 can completely cover the inner pipe surface of the cover glass pipe 22, the outer surface of the corrugated pipe 23 and part of the metal inner pipe, and the air suction capability is enhanced through the barium film 20 exposed on the outer surface, meanwhile, the vacuum life in the pipe is effectively ensured, and the vacuum life is more than 20 years.
The scope of the present invention includes, but is not limited to, the above embodiments, and any alterations, modifications, and improvements made by those skilled in the art are intended to fall within the scope of the invention.
Claims (8)
1. The composite getter for the metal straight-through solar vacuum tube is characterized by comprising an evaporable getter, a non-evaporable getter and a getter bracket, wherein the evaporable getter is connected with the non-evaporable getter through the getter bracket, and the evaporable getter and the non-evaporable getter are concentrically arranged;
the evaporable getter comprises a ring and an evaporable getter alloy powder, the ring comprises an inner ring and an outer ring, the inner ring is arranged in the outer ring, the top end of the inner ring and the top end of the outer ring are connected with each other to form a C-shaped cavity with an opening at the bottom end, the evaporable getter alloy powder is pressed in the C-shaped cavity between the inner ring and the outer ring, and the height of the evaporable getter alloy powder is smaller than the depth of the C-shaped cavity;
the non-evaporable getter comprises a non-evaporable getter strip, a non-evaporable getter support and a non-evaporable getter retainer ring, wherein the non-evaporable getter strip is wrapped on the outer circular surface of the non-evaporable getter support, the non-evaporable getter retainer ring is sleeved on the outer surface of the non-evaporable getter strip, and the non-evaporable getter retainer ring is fixedly connected with the non-evaporable getter support.
2. The composite getter for metal straight through solar vacuum tubes according to claim 1, wherein: the evaporable getter alloy powder comprises barium aluminum powder and nickel powder.
3. The composite getter for metal straight through solar vacuum tubes according to claim 2, wherein: the ratio of barium aluminum powder to nickel powder in the evaporable getter alloy powder is 1:1, and the barium aluminum powder comprises 53.5% of barium and 46.5% of aluminum.
4. The composite getter for metal straight through solar vacuum tubes according to claim 1, wherein: the non-evaporable getter bracket comprises an outer circular straight edge section, a bottom flat edge section and an outer circular flanging section which are sequentially connected from top to bottom, wherein the outer circular straight edge section, the bottom flat edge section and the outer circular flanging section are of an integrated structure, a plurality of circumferential holes are formed in the surface of the bottom flat edge section, and the non-evaporable getter strip is wrapped on the middle lower part of the outer circular straight edge section and the upper surface of the bottom flat edge section.
5. The composite getter for metal straight through solar vacuum tubes according to claim 4, wherein: the non-evaporable getter strip comprises a base band and a non-evaporable getter alloy powder cake, the non-evaporable getter alloy powder cake is pressed on the front surface and the back surface of the base band, the non-evaporable getter strip is formed by winding the base band pressed with the non-evaporable getter alloy powder cake, and the unfolding length of the base band is 1-10 m.
6. The composite getter for metal straight through solar vacuum tubes according to claim 5, wherein: the non-evaporable getter alloy compact includes zirconium, vanadium, and iron.
7. The composite getter for metal straight through solar vacuum tubes according to claim 6, wherein: the non-evaporable getter alloy powder cake is formed by pressing 72% of zirconium and 28% of vanadium and iron through a vacuum powder smelting method and a ball milling powder making method.
8. The composite getter for metal straight through solar vacuum tubes according to claim 1, wherein: the number of the getter supports is 2, the evaporable getter, the non-evaporable getter and the cover glass tube of the metal straight-through solar vacuum tube are concentrically arranged, the evaporable getter and the non-evaporable getter are fixed on the straight-through metal tube positioned in the cover glass tube in a welding mode, and the vertical distance between the outer ring of the ring and the cover glass tube is 0.5-15 mm.
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| CN108981208A (en) * | 2018-08-17 | 2018-12-11 | 沧州天瑞星光热技术有限公司 | A kind of solar vacuum heat-collecting pipe getter, fixed structure and installation method |
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| CN102141312A (en) * | 2011-04-02 | 2011-08-03 | 山东桑乐真空管有限公司 | All-glass straight-way vacuum heat collecting pipe |
| CN203771756U (en) * | 2013-11-01 | 2014-08-13 | 河北光源太阳能科技有限公司 | Non-evapotranspiration type getter ring |
| CN207365431U (en) * | 2017-07-27 | 2018-05-15 | 南京诚远太阳能科技有限公司 | A kind of composite getter for metal direct connection solar energy vacuum tube |
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| CN107255369A (en) | 2017-10-17 |
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