CN104848569A - Metal heat absorbing body energy storage type vacuum tube and heat collector provided with vacuum tube - Google Patents

Metal heat absorbing body energy storage type vacuum tube and heat collector provided with vacuum tube Download PDF

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Publication number
CN104848569A
CN104848569A CN201510054424.0A CN201510054424A CN104848569A CN 104848569 A CN104848569 A CN 104848569A CN 201510054424 A CN201510054424 A CN 201510054424A CN 104848569 A CN104848569 A CN 104848569A
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China
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tube
energy storage
metal
type vacuum
energy
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CN201510054424.0A
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葛洪川
蒋富林
孙伟
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Beijing Jindu Solar Energy Tech Co Ltd
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Beijing Jindu Solar Energy Tech Co Ltd
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Priority to CN201510054424.0A priority Critical patent/CN104848569A/en
Publication of CN104848569A publication Critical patent/CN104848569A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/44Heat exchange systems

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Abstract

Provided are a metal heat absorbing body energy storage type vacuum tube and a heat collector provided with the vacuum tube. The vacuum tube comprises an outer glass tube, a metal energy storage tube and an annular vacuum sealing connection structure. The outer glass tube and the metal energy storage tube are of single-end opening structures, the periphery of the metal energy storage tube is sleeved with the outer glass tube, the annular vacuum sealing connection structure is in seal connection between the outer glass tube and the metal energy storage tube, the vacuum state is formed between the outer glass tube and the metal energy storage tube, the annular vacuum sealing connection structure comprises a metal sealing connection cover provided with a central opening, the opening tube section of the metal energy storage tube penetrates through the central opening of the metal sealing connection cover to protrude and extend out of the opening, an energy storage material and a heat exchanger are sealed in a cavity of the metal energy storage tube, and an inlet and an outlet of the heat exchanger are led out of a single end opening of the cavity of the metal energy storage tube. Heat energy obtained after solar energy is converted is stored through energy storage materials, cold water is changed into hot water through heat exchange of the heat exchanger, and the vacuum tube and the heat collector are quite suitable for being in the field of building integration.

Description

Metal absorber energy storage type vacuum tube and there is the heat collector of this vacuum tube
Technical field
The present invention relates to a kind of solar energy heat utilization device, particularly a kind of metal absorber energy storage type vacuum tube and there is the heat collector of this vacuum tube.
Background technology
As everyone knows, solar water heater is most widely used general, industrialized development solar product the most rapidly in China's Solar use.Solar water heater development experience closing-sunning type, flat and complete glass vacuum sun thermal-collecting tube formula three developing stage of China: passive solarenergy water heater is widely used in the 70-80 age in 20th century, this water heater structure is simple, easily universal, but its efficiency is low, rapid heat dissipation, moisture storage capacity are little, and season in winter in spring and autumn three cannot use, therefore not there is the prospect greatly developed; Flat solar water heater is widely used in the 80-90 age in 20th century, but it also cannot run in the winter time, and night, heat dissipation capacity was comparatively large, withdrew from the market gradually, only had use at the Delta of the Pearl River and isothermal torrid areas, Yunnan at present; Complete glass vacuum sun thermal-collecting tube water heater progressively uses, grows up from the nineties in last century, now become main flow, its main feature is that vacuum heat-insulation and absorber coatings low heat-emissive make vacuum heat collection pipe hardly by the impact of environment temperature, and southern and northern each department all can use throughout the year.The structure of complete glass vacuum sun thermal-collecting tube, as the glass liner for vacuum flask of same elongation, is vacuum between ectonexine, the surface of inner glass tube utilizes special warfare to scribble spectral selective absorbing coating, is used for absorbing solar radiant energy to greatest extent.
This all-glass vacuum tube is relatively applicable to close-coupled solar water heater complete machine supporting, is relatively applicable to the application of vast rural market.But because when this all-glass vacuum tube uses, interior tube chamber must directly be leaked water, its glass inner tube can not bear the pressure of municipal tap water pipe network, can not adapt to urban architecture service condition.
For this reason, the vacuum tube of development pressure-bearing type becomes the main trend that solar thermal utilization is applied in urban environment.Wherein the vacuum tube of metal absorber formula obtains common concern, and particularly the thermal storage type vacuum tube of metal inner tube is more favored, and more existing patents relate to and propose the thermal storage type vacuum tube of stainless steel inner container and the thermal storage type vacuum tube of enamel inner container.But the thermal storage type vacuum tube that these direct heat transfers are leaked water encounters new problem again.Stainless steel inner container thermal storage type vacuum tube has the advantage that structure is simple and the thermal efficiency is higher, but finds in the application, and when thermal storage type vacuum tube is in the output of long-time empty calory, in stainless steel inner container, water temperature constantly raises and forms the working environment of HTHP.Because stainless service life and temperature and pressure have direct relation, the working environment of this HTHP is easy to stainless steel inner container is corroded, serious curtailment service life of thermal storage type vacuum tube.In order to head it off, once considered to adopt titanium alloy material to replace stainless steel, but titanium alloy material is expensive again, is therefore also not suitable for popularity to market.
There is life-span hidden danger too in the thermal storage type vacuum tube of enamel inner container, although also can make up by device magnesium anode as electric heater, slowing down corrosion.But magnesium anode also has service life, general provision 3-5 need regularly replace maintenance, and the electric heater as indoor article is rationally acceptable.But solar water heater must be arranged on outdoor, repair and replacement are unacceptable frequently, must accomplish long-term freedom from repairs.For this reason, the Seeking Development Through more technology of long-life freedom from repairs and product must be continued.
Summary of the invention
The object of the invention is for above-mentioned the deficiencies in the prior art, a kind of energy storage type vacuum tube of metal inner tube of pressure-bearing type of long-life freedom from repairs is provided.
To achieve these goals, technical solution of the present invention is:
A kind of metal absorber energy storage type vacuum tube, described vacuum tube comprises an outer glass tube, a metal energy-storage tube and ring vaccum sealing structure, described outer glass tube and described metal energy-storage tube are single-ended hatch frame, and it comprises the courage portion of tail end and the opening pipeline section being provided with opening of front end; Described outer glass tube is sheathed on the periphery of described metal energy-storage tube, described ring vaccum sealing structure is packaged between described outer glass tube and metal energy-storage tube, vacuum state is formed between described outer glass tube and described metal energy-storage tube, metal energy storage tube outer surface is provided with one deck solar selective absorbing coatings, wherein, be packaged with energy storage material and heat exchanger in described metal energy storage tube chamber, the import of described heat exchanger and outlet are drawn from the single-ended opening part of metal energy-storage tube.
A kind of metal absorber energy storage type vacuum tube as above, wherein, described heat exchanger adopts U-shaped heat exchanger tube, snakelike heat exchange tube or spiral heat exchange tube.
A kind of metal absorber energy storage type vacuum tube as above, wherein, energy storage material can be researching of sensible heat storage material, as water or anti-icing fluid, also can be latent heat solid-liquid phase change material, as 12 water sodium phosphates, palmitic acid, stearic acid or paraffin etc.
A kind of energy storage type vacuum tube as above, wherein, described ring vaccum sealing structure is packaged between described outer glass tube and metal energy-storage tube, comprise the metal sealing lid with central opening, the outer peripheral edge sealing-in of this metal sealing lid is at the opening part of described outer glass tube, and inner peripheral is directly welded on the outer wall of the opening pipeline section of described metal energy-storage tube.
A kind of metal absorber energy storage type vacuum tube as above, wherein, described ring vaccum sealing structure is packaged between described outer glass tube and metal energy-storage tube, comprise the metal sealing lid and flexible bellow with central opening, the outer peripheral edge sealing-in of this metal sealing lid is at the opening part of described outer glass tube, one end of this flexible bellow is welded on the inner peripheral of the central opening of metal sealing lid, be welded on the opening pipeline section outer wall of described metal energy-storage tube on the outer wall that the other end of this flexible bellow is directly welded on the opening pipeline section of described metal energy-storage tube or by transition rings.
A kind of metal absorber energy storage type vacuum tube as above, wherein, the exhaust nozzle of energy storage type vacuum tube is be arranged on the metal exhaust tube that described metal sealing covers, or is set directly at the glass exhaust nozzle of afterbody of described outer glass tube.
The present invention proposes a kind of energy storage type vacuum tube collector simultaneously, wherein, this heat collector comprises inlet and outlet pipe, incubation chamber and multiple energy storage type vacuum tube as above, incubation chamber is located at each energy storage type vacuum tube openend, inlet and outlet pipe is located in this incubation chamber, the heat exchanger water inlet of each energy storage type vacuum tube and delivery port, be connected with each energy-storage tube intake-outlet respectively.
Energy storage type vacuum tube collector as above, wherein, each energy storage type vacuum tube is connected by metal hose tandem, and the delivery port of previous stage energy storage type vacuum tube is connected to the water inlet of rear stage energy storage hot type vacuum tube by metal hose.
Energy storage type vacuum tube collector as above, wherein, the water inlet of each energy storage type vacuum tube, delivery port are connected in parallel by union pipe, and the water inlet of each energy storage type vacuum tube is connected to a cold water inlet, and the delivery port of each energy storage type vacuum tube is connected to a hot water outlet pipe.
Technical characterstic of the present invention and advantage are: make the thermal storage type vacuum tube of metal inner tube become indirect heat exchange by the direct mode of leaking water and to leak water mode, heat energy after being changed by solar energy by energy storage material is stored, hot water is become by after cold water heat exchange by heat exchanger, make hot water water lines be in tap water pipe network artesian condition all the time, make this vacuum tube and heat collector be applicable to very much architecture-integral field and use.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first embodiment of energy storage type vacuum tube of the present invention.
Fig. 2 is the structural representation of the second embodiment of energy storage type vacuum tube of the present invention.
Fig. 3 be energy storage type vacuum tube of the present invention be applied to one of structural representation of a heat collector.
Fig. 4 is the structural representation two being applied to another heat collector of energy storage type vacuum tube of the present invention.
Accompanying drawing Major Symbol illustrates:
1, outer glass tube 2, metal energy-storage tube 21, energy-storage tube opening pipeline section
22, courage portion 23, heat absorbing coating 24, opening pipeline section seal cover
3, ring vaccum sealing structure 31, metal sealing lid 32, bellows 33, transition rings
4, energy storage material 5, heat exchanger 51, import and outlet
6, metal exhaust chew 6 ', glass exhaust nozzle
100, energy storage type vacuum tube 101, energy-storage tube heat exchanger inlet and outlet joint 102, incubation chamber
103, metal hose 103 ', union pipe
Detailed description of the invention
First the present invention proposes a kind of metal absorber energy storage type vacuum tube, described vacuum tube comprises an outer glass tube, one metal energy-storage tube and ring vaccum sealing structure, described outer glass tube and metal energy-storage tube are single-ended hatch frame, described outer glass tube is sheathed on the periphery of described metal energy-storage tube, described ring vaccum sealing structure is packaged between described outer glass tube and metal energy-storage tube, vacuum state is formed between outer glass tube and energy-storage tube, energy storage material and heat exchanger is packaged with in the cavity of described metal energy-storage tube, the import of described heat exchanger and outlet are drawn from the single-ended opening part of the cavity of metal energy-storage tube.Heat energy after solar energy is changed by energy storage material by the present invention stores, by heat exchanger, cold water heat exchange is become hot water, make hot water water lines be in tap water pipe network artesian condition all the time, this vacuum tube and heat collector are applicable to architecture-integral field and use very much.
The detailed description of the invention of drawings and the specific embodiments to metal absorber energy storage type vacuum tube of the present invention is coordinated to be described in further detail below.
First embodiment
As shown in Figure 1, it is the structural representation of the first embodiment of metal absorber energy storage type vacuum tube of the present invention.In the present embodiment, this energy storage type vacuum tube comprises outer glass tube 1, metal energy-storage tube 2 and the ring vaccum sealing structure 3 between the two openend, outer glass tube 1 and metal energy-storage tube 2 are single-ended hatch frame, metal energy-storage tube 2 comprises the opening pipeline section 21 of openend and the courage portion 22 of tail end, wherein, opening pipeline section 21 is formed by courage portion 22 front end undergauge, and wear protrude into outer glass tube 1 opening outside, using as external interface.Wherein, internal thread, external screw thread and form of flanges can be processed in the interface section of the opening pipeline section of metal energy-storage tube 2, are convenient to be connected with outlet pipe section seal cover 24.Be packaged with energy storage material 4 and heat exchanger 5 in the cavity of metal energy-storage tube 2, import and the outlet 51 of heat exchanger 5 are drawn from the opening part of the outlet pipe section 21 of metal energy-storage tube, and seal affixed with outlet pipe section seal cover 24.
In the present embodiment, ring vaccum sealing structure 3 adopts without the built-in structure of flexible bellow, it comprises metal sealing lid 31, wherein, metal sealing lid 31 has central opening, for wearing for the opening pipeline section 21 of metal energy-storage tube 2, the outer rim of metal sealing lid 31 is packaged on the openend of outer glass tube 1, its center opening part inner circumferential end is directly welded on the outer wall of opening pipeline section of metal energy-storage tube 2, metal sealing lid 31 can adopt nickel steel to make, process for sealing between itself and outer glass tube 1 can be hot-press sealing, flame sealing or low temperature glass sealing-in etc., no longer describe in detail herein.
In the present embodiment, as shown in Figure 1, this metal energy-storage tube 2 is preferably to be made up of carbon steel material, and the outer surface of heat storage tube 2 is coated with solar spectral selective heat absorbing coating 23.Such as, but be not limited thereto, the material of this heat storage tube 2 also can adopt stainless steel etc.
The nozzle flange of the outer glass tube of the energy storage type vacuum tube of the present embodiment is the flange that turns up, and exhaust nozzle is that the metal exhaust be arranged on metal sealing lid 31 chews 6, because other structures can adopt prior art to realize, so repeat no longer one by one.
Second embodiment
As shown in Figure 2, it is the structural representation of the second embodiment of metal absorber energy storage type vacuum tube of the present invention.In the present embodiment, its agent structure is identical with the first embodiment: this energy storage type vacuum tube comprises outer glass tube 1, metal energy-storage tube 2 and the ring vaccum sealing structure 3 between the two openend, outer glass tube 1 and metal energy-storage tube 2 are single-ended hatch frame, metal energy-storage tube 2 comprises the opening pipeline section 21 of openend and the courage portion 22 of tail end, wherein, opening pipeline section 21 is formed by courage portion 22 front end undergauge, and wear protrude into outer glass tube 1 opening outside, using as external interface.Wherein, internal thread, external screw thread and form of flanges can be processed in the interface section of the opening pipeline section of metal energy-storage tube 2, are convenient to be connected with outlet pipe section seal cover 24.Be packaged with energy storage material 4 and heat exchanger 5 in the cavity of metal energy-storage tube 2, import and the outlet 51 of heat exchanger 5 are drawn from the opening part of the outlet pipe section 21 of metal energy-storage tube, and seal affixed with outlet pipe section seal cover 24.
Be with the main difference part of previous embodiment, in the present embodiment, ring vaccum sealing structure 3 adopts the structure having flexible bellow built-in, it comprises metal sealing lid 31, bellows 32 and transition rings 33, wherein, metal sealing lid 31 has central opening, for wearing for the opening pipeline section 21 of metal energy-storage tube 2, the outer rim of metal sealing lid 31 is packaged on the openend of outer glass tube 1, its center opening part inner peripheral then welds with the front end of bellows 32, the rear end of bellows 32 is then welded on the outer wall of opening pipeline section of metal energy-storage tube 2 by a transition rings 33, thus make this bellows 32 be positioned at outer glass tube 1, metal sealing lid 31 can adopt nickel steel to make, and the process for sealing between itself and outer glass tube 1 can be hot-press sealing, flame sealing or low temperature glass sealing-in etc., bellows 32 and transition rings 33 can adopt stainless steel material to be processed into.No longer describe in detail herein.
The nozzle flange of the outer glass tube of the energy storage type vacuum tube of the present embodiment is varus flange, and exhaust nozzle is the glass exhaust nozzle 6 ' being arranged at outer glass tube 1 afterbody.
As shown in Figure 3, Figure 4, it is the structural representation of two kinds of energy storage type vacuum tube collectors that metal absorber energy storage type vacuum tube of the present invention application is formed.In similar application, this heat collector comprises inlet and outlet pipe, incubation chamber 102 and multiple energy storage type vacuum tube 100, wherein, each energy storage type vacuum tube 100 is connected with inlet and outlet pipe by energy-storage tube heat exchanger inlet and outlet joint 101, and the water inlet of each energy storage type vacuum tube stretches near bottom position in metal energy-storage tube, in order to carrying out sufficient heat exchange by a penstock 102.
As shown in Figure 3, in this application, inlet and outlet pipe adopts series-mode frame, namely each energy storage type vacuum tube is by connecting before and after metal hose 103, the delivery port of previous stage energy storage type vacuum tube is connected to the water inlet of rear stage energy storage type vacuum tube by metal hose 103, thus form tandem heat collector, hot water can be realized and supply water.Should be applicable to the smaller place of required output by use-case, single heat collector uses, and leaving water temperature can be made to continue to keep stable.
As shown in Figure 4, in this application, inlet and outlet pipe adopts parallel structure, namely the water inlet of each energy storage type vacuum tube, delivery port are connected in parallel by union pipe 103 ', the water inlet of each energy storage type vacuum tube 100 is connected to a cold water pipe, the delivery port of each energy storage type vacuum tube 100 is connected to a hot-water line, thus forms united pipe type heat collector, can realize larger water yield.Should in use-case, can use by multiple heat collector serial or parallel connection, the place that applicable water consumption is larger, is beneficial to the water yield that maintenance is larger again.
Although the present invention discloses with specific embodiment; but it is also not used to limit the present invention; any those skilled in the art; the displacement of equivalent assemblies done under the prerequisite not departing from the spirit and scope of the present invention; or the equivalent variations to do according to scope of patent protection of the present invention and modification, all still should belong to the category that this patent is contained.

Claims (9)

1. a metal absorber energy storage type vacuum tube, described vacuum tube comprises an outer glass tube, a metal energy-storage tube and ring vaccum sealing structure, described outer glass tube and described metal energy-storage tube are single-ended hatch frame, and it comprises the courage portion of tail end and the opening pipeline section being provided with opening of front end; Described outer glass tube is sheathed on the periphery of described metal energy-storage tube, described ring vaccum sealing structure is packaged between described outer glass tube and metal energy-storage tube, vacuum state is formed between described outer glass tube and described metal energy-storage tube, metal energy storage tube outer surface is provided with one deck solar selective absorbing coatings, it is characterized in that, be packaged with energy storage material and heat exchanger in described metal energy storage tube chamber, the import of described heat exchanger and outlet are drawn from the single-ended opening part of metal energy-storage tube.
2. a kind of energy storage type vacuum tube as claimed in claim 1, is characterized in that: described heat exchanger adopts U-shaped heat exchanger tube, snakelike heat exchange tube or spiral heat exchange tube.
3. a kind of energy storage type vacuum tube as claimed in claim 1, is characterized in that: energy storage material can be researching of sensible heat storage material, as water or anti-icing fluid, also can be latent heat solid-liquid phase change material, as 12 water sodium phosphates, palmitic acid, stearic acid or paraffin etc.
4. a kind of energy storage type vacuum tube as claimed in claim 1, it is characterized in that: described ring vaccum sealing structure is packaged between described outer glass tube and metal energy-storage tube, comprise the metal sealing lid with central opening, one end, periphery sealing-in of this metal sealing lid is at the opening part of described outer glass tube, and inner circumferential end is directly welded on the outer wall of the opening pipeline section of described metal energy-storage tube.
5. a kind of energy storage type vacuum tube as claimed in claim 1, it is characterized in that: described ring vaccum sealing structure is packaged between described outer glass tube and metal energy-storage tube, comprise the metal sealing lid and flexible bellow with central opening, the outer circumference end sealing-in of this metal sealing lid is at the opening part of described outer glass tube, one end of this flexible bellow is welded on the central opening of metal sealing lid, is welded on the opening pipeline section outer wall of described metal energy-storage tube on the outer wall that the other end is directly welded on the opening pipeline section of described metal energy-storage tube or by transition rings.
6. a kind of energy storage type vacuum tube as claimed in claim 1, is characterized in that: the exhaust nozzle of energy storage type vacuum tube is be arranged on the metal exhaust tube that described metal sealing covers, or is set directly at the glass exhaust nozzle of afterbody of described outer glass tube.
7. an energy storage type vacuum tube collector, it is characterized in that, this heat collector comprises inlet and outlet pipe, incubation chamber and the multiple energy storage type vacuum tubes as described in any one of claim 1 ~ 6, incubation chamber is located at each energy storage type vacuum tube openend, inlet and outlet pipe is located in this incubation chamber, the heat exchanger water inlet of each energy storage type vacuum tube and delivery port, be connected with each energy-storage tube intake-outlet respectively.
8. energy storage type vacuum tube collector as claimed in claim 7, it is characterized in that, each energy storage type vacuum tube is connected by metal hose tandem, and the delivery port of previous stage energy storage type vacuum tube is connected to the water inlet of rear stage energy storage hot type vacuum tube by metal hose.
9. energy storage type vacuum tube collector as claimed in claim 7, it is characterized in that, the water inlet of each energy storage type vacuum tube, delivery port are connected in parallel by union pipe, the water inlet of each energy storage type vacuum tube is connected to a cold water inlet, and the delivery port of each energy storage type vacuum tube is connected to a hot water outlet pipe.
CN201510054424.0A 2015-02-03 2015-02-03 Metal heat absorbing body energy storage type vacuum tube and heat collector provided with vacuum tube Pending CN104848569A (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105928216A (en) * 2016-04-11 2016-09-07 北京金阳科创太阳能技术有限公司 Point focusing solar vacuum receiver
CN105953442A (en) * 2016-06-03 2016-09-21 楚雄师范学院 Vacuum tube heat collecting solar water heater and hot water storage control method
WO2023175051A1 (en) * 2022-03-15 2023-09-21 Martin Hadlauer Absorber unit, mirror unit and solar collector or solar installation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101639296A (en) * 2009-08-24 2010-02-03 北京桑达太阳能技术有限公司 Thermal storage type vacuum tube
CN202188677U (en) * 2011-08-18 2012-04-11 北京金阳科创太阳能技术有限公司 Thermal storage vacuum tube and heat collector with the vacuum tube
CN204612204U (en) * 2015-02-03 2015-09-02 北京金阳科创太阳能技术有限公司 Metal absorber energy storage type vacuum tube and there is the heat collector of this vacuum tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101639296A (en) * 2009-08-24 2010-02-03 北京桑达太阳能技术有限公司 Thermal storage type vacuum tube
CN202188677U (en) * 2011-08-18 2012-04-11 北京金阳科创太阳能技术有限公司 Thermal storage vacuum tube and heat collector with the vacuum tube
CN204612204U (en) * 2015-02-03 2015-09-02 北京金阳科创太阳能技术有限公司 Metal absorber energy storage type vacuum tube and there is the heat collector of this vacuum tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105928216A (en) * 2016-04-11 2016-09-07 北京金阳科创太阳能技术有限公司 Point focusing solar vacuum receiver
CN105953442A (en) * 2016-06-03 2016-09-21 楚雄师范学院 Vacuum tube heat collecting solar water heater and hot water storage control method
WO2023175051A1 (en) * 2022-03-15 2023-09-21 Martin Hadlauer Absorber unit, mirror unit and solar collector or solar installation

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Application publication date: 20150819