CN108518880B - Flow-limiting mixed-flow pressure regulating mechanism for cavity type heat absorber and cavity type heat absorber - Google Patents
Flow-limiting mixed-flow pressure regulating mechanism for cavity type heat absorber and cavity type heat absorber Download PDFInfo
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- CN108518880B CN108518880B CN201810425367.6A CN201810425367A CN108518880B CN 108518880 B CN108518880 B CN 108518880B CN 201810425367 A CN201810425367 A CN 201810425367A CN 108518880 B CN108518880 B CN 108518880B
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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
Abstract
The invention discloses a current-limiting mixed flow pressure regulating mechanism for a cavity type heat absorber and the cavity type heat absorber, wherein the current-limiting mixed flow pressure regulating mechanism comprises a current-limiting mixed flow plate, a secondary mixed flow plate, a gas-blocking component and an elastic component; the lower end of the elastic component is fixedly arranged on the secondary mixed flow plate, and the upper end of the elastic component is fixedly connected with the air blocking component; the flow limiting mixed flow plate is provided with a pressure relief hole and a primary mixed flow hole; the gas blocking component seals the pressure relief hole under the action of the elastic force of the elastic component; the secondary mixed flow plate is provided with a secondary mixed flow hole; the cavity type heat absorber comprises a heat absorber shell, heat absorber foam metal and a current-limiting mixed flow pressure regulating mechanism, wherein the heat absorber foam metal and the current-limiting mixed flow pressure regulating mechanism are both arranged in the heat absorber shell, and the heat absorber foam metal is positioned above the current-limiting mixed flow pressure regulating mechanism. The invention can realize uniform and full heat exchange of the pressurized gas and ensure the safe operation of the heat absorber.
Description
Technical Field
The present invention relates to a heat absorber. In particular to a flow-limiting mixed-flow pressure regulating mechanism for a cavity type heat absorber and the cavity type heat absorber.
Background
The solar energy resource has the advantages of wide distribution, abundant resources, inexhaustible use and the like, and the development and the utilization of the solar energy not only can provide huge energy sources for human society, but also can save conventional fossil fuel, protect ecological environment, alleviate the global climate change which is increasingly serious worldwide and the like. Therefore, the development and utilization of solar energy resources have been paid much attention to all countries in the world for a long time, and have become a hot spot research field worldwide.
The technology of solar energy development and utilization is essentially to collect solar energy with low heat flux density and utilize the solar energy through a certain energy conversion mode. The solar energy resource can be divided into light-heat conversion utilization, photoelectric conversion utilization and photochemical conversion utilization according to the energy conversion mode. The solar thermal power generation is one of the effective ways of solar photo-thermal conversion and utilization, has the advantages of no use of conventional fossil fuel, zero pollutant emission and the like, and is a clean power generation system which is harmonious with the natural ecological environment.
However, the thermal efficiency of solar energy systems, especially power generation systems, has so far been low, one of the reasons for this being the high heat loss of the collector. The high-temperature heat collector used in the current solar energy system is mainly a cavity type heat absorber. Research on improving the efficiency of the heat collector is generally focused mainly on heat loss of the cavity heat absorber, heat exchange efficiency inside the heat absorber, and the like.
Disclosure of Invention
Therefore, the invention aims to provide the cavity type heat absorber which has uniform and sufficient heat exchange and high safety.
In order to solve the technical problems, the invention provides the following technical scheme:
a flow-limiting mixed-flow pressure regulating mechanism for a cavity type heat absorber comprises a flow-limiting mixed-flow plate, a secondary mixed-flow plate, a gas-blocking component and an elastic component; the lower end of the elastic component is fixedly arranged on the secondary mixed flow plate, and the upper end of the elastic component is fixedly connected with the air blocking component; the flow limiting mixed flow plate is provided with a pressure relief hole and a primary mixed flow hole; the gas blocking component seals the pressure relief hole under the action of the elastic force of the elastic component; the secondary mixed flow plate is provided with a secondary mixed flow hole; and the heat-exchanged gas enters the cavity between the flow-limiting mixed flow plate and the secondary mixed flow plate through the primary mixed flow hole, and is discharged out of the cavity type heat absorber through the secondary mixed flow hole.
The pressure relief hole is one, and the aperture of the pressure relief hole is larger than that of the primary mixed flow hole.
In the flow-limiting mixed flow pressure regulating mechanism, the ratio of the total area of the pressure relief holes to the total area of the primary mixed flow holes is 25:8.
The flow-limiting mixed flow pressure regulating mechanism is characterized in that the ratio of the total area of the secondary mixed flow holes to the total area of the primary mixed flow holes is 2.54:1.
The cavity type heat absorber comprises a heat absorber shell, heat absorber foam metal and a flow-limiting mixed flow pressure regulating mechanism, wherein the heat absorber foam metal and the flow-limiting mixed flow pressure regulating mechanism are both arranged in the heat absorber shell, and the heat absorber foam metal is positioned above the flow-limiting mixed flow pressure regulating mechanism; the flow-limiting mixed-flow pressure regulating mechanism comprises a flow-limiting mixed-flow plate, a secondary mixed-flow plate, a gas-blocking component and an elastic component; the lower end of the elastic component is fixedly arranged on the secondary mixed flow plate, and the upper end of the elastic component is fixedly connected with the air blocking component; the flow limiting mixed flow plate is provided with a pressure relief hole and a primary mixed flow hole; the gas blocking component seals the pressure relief hole under the action of the elastic force of the elastic component; the secondary mixed flow plate is provided with a secondary mixed flow hole; the gas subjected to foam metal heat exchange of the heat absorber enters a cavity between the flow-limiting mixed flow plate and the secondary mixed flow plate through the primary mixed flow hole, and is discharged out of the cavity type heat absorber through the secondary mixed flow hole; the pressure relief hole is one and is positioned in the center of the flow limiting mixed flow plate, the ratio of the total area of the pressure relief hole to the total area of the primary mixed flow hole is (20-30): 8, and the ratio of the total area of the secondary mixed flow hole to the total area of the primary mixed flow hole is (2-3): 1; the porosity of the foam metal of the heat absorber is 60% -98%, the average pore size is 1 mm-4 mm, and the porosity is 90% -98%.
The cavity type heat absorber comprises the heat absorber shell and the heat absorber inner shell, an air inlet channel is arranged between the heat absorber shell and the heat absorber inner shell, the air outlet end of the air inlet channel is in fluid conduction with the air inlet surface of the heat absorber foam metal, the air outlet surface of the heat absorber foam metal is in fluid conduction with the air inlet end of the flow-limiting mixed flow pressure regulating mechanism, and the air outlet end of the flow-limiting mixed flow pressure regulating mechanism is in fluid conduction with the air outlet of the cavity type heat absorber; the heat absorber outer shell and the heat absorber inner shell are composed of an upper cylindrical structure and a lower inverted truncated cone-shaped structure, the inner cavity of the cylindrical structure is in fluid communication with the inner cavity of the inverted truncated cone-shaped structure, and the lower edge of the cylindrical structure is fixedly connected with the upper edge of the inverted truncated cone-shaped structure; the flow limiting mixed flow plate is arranged at the joint of the cylindrical structure and the inverted truncated cone structure of the inner shell of the heat absorber; the width of the air inlet passage between the cylindrical structure of the heat absorber outer shell and the cylindrical structure of the heat absorber inner shell is smaller than the width of the air inlet passage between the inverted frustoconical structure of the heat absorber outer shell and the inverted frustoconical structure of the heat absorber inner shell.
The cavity type heat absorber further comprises an exhaust pipe and a gas reverser arranged at the bottom of the heat absorber shell, the upper end of the exhaust pipe is in fluid conduction with the cavity below the secondary mixed flow plate, and the lower end of the exhaust pipe penetrates through the gas reverser and stretches out to the lower side of the gas reverser.
The cavity type heat absorber comprises a commutator shell and a filtering system, wherein an air inlet hole is formed in the side vertical wall of the commutator shell, and the filtering system is fixedly arranged at the air inlet of the air inlet hole; the lower end of the exhaust pipe penetrates through the bottom wall of the gas reverser and extends out to the lower side of the gas reverser.
The cavity type heat absorber is characterized in that the filtering system is an air filtering net, the air filtering net is fixedly arranged at the air inlet of the air inlet hole through a screw and a filtering net fixing plate, and the air filtering net is positioned between the end face of the air inlet hole and the filtering net fixing plate.
The cavity type heat absorber further comprises a heat absorbing body fixer, a nut, a sealing graphite gasket, an inner hexagonal bolt, an optical lens, a flange plate and a flange plate fixer; the heat absorber fixer is arranged in the heat absorber inner shell, and the heat absorber foam metal is fixedly arranged in the heat absorber inner shell through the heat absorber fixer; the sealing graphite gasket is positioned on the upper end face of the fixed mounting part, the flange plate is pressed on the sealing graphite gasket, and the flange plate fixer is positioned on the lower end face of the fixed mounting part; the inner hexagon bolt sequentially passes through the flange plate, the sealing graphite gasket, the fixed mounting part and the flange plate fixer from top to bottom and is in threaded connection with the nut; the optical lens is positioned at the opening at the upper end of the heat absorber shell, and the edge of the optical lens is positioned in the groove between the flange plate and the fixed mounting part; an air outlet of the air inlet channel is arranged between the lower bottom surface of the optical lens and the upper edge of the inner shell of the heat absorber, and the air outlet of the air inlet channel is in fluid communication with an air storage chamber on the foam metal of the heat absorber; the heat absorber foam metal is heat absorber foam copper, and the outer surface of the heat absorber shell is coated with a radiation heat insulation layer.
The technical scheme of the invention has the following beneficial technical effects:
(1) The cavity type heat absorber adopts the foam copper (other foam metals can also be adopted) as a heat absorber, and the foam copper has a good three-dimensional flow guiding structure and can enable a gas working medium to flow through; the specific surface area is large, and the heat exchange can be carried out fully by contacting with the gas as much as possible; the larger heat conductivity coefficient is beneficial to heat exchange; the heat exchange is enhanced to enhance the heat exchange effect, thereby improving the heat utilization of solar energy.
(2) The lower part of the cavity type heat absorber shell is in an inverted truncated cone shape, the width of the air inlet channel between the inverted truncated cones of the inner shell and the outer shell is larger than that of the cylindrical air inlet channel of the inner shell and the outer shell, more working medium gas can be reserved, and the heated air exchanges heat with the inner shell to raise the temperature of the inner shell, so that the heated inner shell can be utilized to preheat the air reserved in the air inlet channel between the inverted truncated cones of the inner shell and the outer shell again, and heat loss is reduced.
(3) The cavity type heat absorber is sealed by adopting the high-temperature-resistant graphite gasket, and the graphite gasket has the advantages of high temperature resistance, ageing resistance, self lubrication, compressibility and rebound resilience, has a good sealing effect and is suitable for various environments such as medium temperature, high temperature and the like.
(4) According to the cavity type heat absorber, the flow-limiting mixed flow pressure regulating mechanism is used, when the collection pressure of the gas working medium is increased to or above the preset pressure after the flow is limited, the gas pushes the gas blocking component to move downwards, so that the gas working medium flows out of the pressure relief hole, the pressure in the inner cavity is reduced, the pressure in the whole heat absorber is regulated and controlled, and the safety of the inner structure is protected; the preset pressure can be changed by selecting different types of elastic components, and the pressure is adjusted according to the situation.
(5) The air inlet of the cavity type heat absorber is provided with the filtering system, the filtering system can be an air filter screen mainly comprising a plurality of layers of stainless steel screens, and air in the atmosphere can remove fine particle garbage in the air through the air filter screen, so that the heat absorber is protected, and the service life of the heat absorber is prolonged.
(6) The cavity type heat absorber can be coated with radiation heat insulation materials on the outer surface of the heat absorber shell so as to reduce heat radiation of the shell and reduce heat loss.
(7) Because the gas enters the micropores of the foam metal to exchange heat with the foam metal, compared with the traditional coil pipe type heat exchange mode or the partition wall type heat exchange mode, the heat exchange efficiency is greatly improved, and the gas working medium enters the inner shell from the inner shell to the outer shell to exchange heat with the foam metal, so that the preheating of the gas working medium can be realized, and the heat loss of the heat absorber can be greatly reduced.
Drawings
Fig. 1 is a schematic structural view of a cavity type heat absorber of the present invention.
The reference numerals in the drawings are as follows:
1-gas reverser, 2-heat absorber shell, 3-heat absorber inner shell, 4-heat absorber fixer, 5-heat absorber foamy copper, 6-nut, 7-sealed graphite gasket, 8-hexagon socket head cap screw, 9-optical lens, 10-flange, 11-flange fixer, 12-current limiting mixed flow plate, 13-choke piece, 14-spring, 15-secondary mixed flow plate, 16-filter screen fixed plate, 17-air filter screen, 18-screw, 19-air inlet channel, 20-relief hole, 21-primary mixed flow hole, 22-secondary mixed flow hole, 23-blast pipe, 24-reverser shell, 25-inlet hole, 26-fixed mounting part, 27-recess.
Detailed Description
As shown in fig. 1, the cavity type heat absorber comprises a heat absorber shell, heat absorber foam metal and a flow-limiting mixed flow pressure regulating mechanism, wherein the heat absorber foam metal and the flow-limiting mixed flow pressure regulating mechanism are both arranged in the heat absorber shell, and the heat absorber foam metal is positioned above the flow-limiting mixed flow pressure regulating mechanism; the flow-limiting mixed-flow pressure regulating mechanism comprises a flow-limiting mixed-flow plate 12, a secondary mixed-flow plate 15, a gas-blocking component (the gas-blocking component in the embodiment is a gas-blocking sheet 13) and an elastic component (the elastic component in the embodiment is a spring 14); the lower end of the elastic component is fixedly arranged on the secondary mixed flow plate 15, and the upper end of the elastic component is fixedly connected with the air blocking component; the flow limiting mixed flow plate 12 is provided with a pressure relief hole 20 and a primary mixed flow hole 21; the gas blocking component seals the pressure relief hole 20 under the action of the elastic force of the elastic component; the secondary mixed flow plate 15 is provided with a secondary mixed flow hole 22; the gas after heat exchange of the foam metal of the heat absorber enters the cavity between the flow-limiting mixed flow plate 12 and the secondary mixed flow plate 15 through the primary mixed flow hole 21, and is discharged out of the cavity type heat absorber through the secondary mixed flow hole 22. The heat absorber shell comprises a heat absorber outer shell 2 and a heat absorber inner shell 3, an air inlet channel 19 is arranged between the heat absorber outer shell 2 and the heat absorber inner shell 3, the air outlet end of the air inlet channel 19 is in fluid conduction with the air inlet surface of the heat absorber foam metal, the air outlet surface of the heat absorber foam metal is in fluid conduction with the air inlet end of the flow-limiting mixed flow pressure regulating mechanism, and the air outlet end of the flow-limiting mixed flow pressure regulating mechanism is in fluid conduction with the air outlet of the cavity type heat absorber; the heat absorber outer shell 2 and the heat absorber inner shell 3 are both composed of an upper cylindrical structure and a lower inverted truncated cone structure, the inner cavity of the cylindrical structure is in fluid communication with the inner cavity of the inverted truncated cone structure, and the lower edge of the cylindrical structure is fixedly connected with the upper edge of the inverted truncated cone structure; the flow limiting mixed flow plate 12 is arranged at the joint of the cylindrical structure and the inverted truncated conical structure of the inner absorber shell 3; the width of the air inlet channel 19 between the cylindrical structure of the absorber outer shell 2 and the cylindrical structure of the absorber inner shell 3 is smaller than the width of the air inlet channel 19 between the inverted frustoconical structure of the absorber outer shell 2 and the inverted frustoconical structure of the absorber inner shell 3.
The cavity type heat absorber further comprises an exhaust pipe 23 and a gas reverser 1 arranged at the bottom of the heat absorber shell 2, the upper end of the exhaust pipe 23 is in fluid communication with a cavity below the secondary mixed flow plate 15, and the lower end of the exhaust pipe 23 penetrates through the gas reverser 1 and extends out to the lower side of the gas reverser 1. The gas commutator 1 comprises a commutator shell 24 and a filtering system, wherein an air inlet hole 25 is formed in the side vertical wall of the commutator shell 24, and the filtering system is fixedly arranged at the air inlet of the air inlet hole 25; the lower end of the exhaust pipe 23 passes through the bottom wall of the gas deflector 1 and protrudes below the gas deflector 1. The filtering system is an air filter 17, the air filter 17 is fixedly arranged at the air inlet of the air inlet hole 25 through a screw 18 and a filter fixing plate 16, and the air filter 17 is positioned between the end face of the air inlet and the filter fixing plate 16.
The cavity type heat absorber further comprises a heat absorber fixer 4, a nut 6, a sealing graphite gasket 7, an inner hexagonal bolt 8, an optical lens 9, a flange plate 10 and a flange plate fixer 11; the heat absorber fixer 4 is arranged in the heat absorber inner shell 3, and the heat absorber foam metal is fixedly arranged in the heat absorber inner shell 3 through the heat absorber fixer 4; a fixed mounting part 26 extends out of the circumferential direction of the opening edge of the upper end of the heat absorber shell 2, the sealing graphite gasket 7 is positioned on the upper end surface of the fixed mounting part 26, the flange plate 10 is pressed on the sealing graphite gasket 7, and the flange plate fixer 11 is positioned on the lower end surface of the fixed mounting part 26; the inner hexagon bolt 8 sequentially passes through the flange plate 10, the sealing graphite gasket 7, the fixed mounting part 26 and the flange plate fixer 11 from top to bottom and is in threaded connection with the nut 6, and the sealing graphite gasket 7 can ensure that gas working media do not leak; the optical lens 9 is positioned at the opening of the upper end of the heat absorber shell 2, and the edge of the optical lens 9 is positioned in the groove 27 between the flange plate 10 and the fixed mounting part 26; the air inlet channel 19 is arranged between the lower bottom surface of the optical lens 9 and the upper edge of the inner shell 3 of the heat absorber, the air inlet channel 19 is in fluid communication with the air storage chamber on the foam metal of the heat absorber, the outer surface of the outer shell 2 of the heat absorber is coated with a radiation heat insulation layer, the optical lens 9 has the characteristics of high temperature resistance, good light transmission performance and the like, and meanwhile, the optical lens also plays a role in sealing, and can heat the foam metal of the heat absorber through focused sunlight.
The pressure relief hole 20 is one and is positioned at the center of the flow limiting mixed flow plate 12, the ratio of the total area of the pressure relief hole 20 to the total area of the primary mixed flow hole 21 is 25:8, and the ratio of the total area of the secondary mixed flow hole 22 to the total area of the primary mixed flow hole 21 is 2.54:1; the porosity of the foam metal of the heat absorber is 80%, the average pore size is 2 mm, and the porosity is 98%.
The working principle is as follows:
fine particles in the gas working medium are removed through the air filter screen 17, then enter a cavity between the outer wall of the exhaust pipe 23 and the inner wall of the commutator housing 24 through an air inlet hole 25, then flow upwards along the air inlet channel 19 between the inverted truncated conical structure of the heat absorber outer shell 2 and the inverted truncated conical structure of the heat absorber inner shell 3, and enter the air inlet channel 19 between the cylindrical structure of the heat absorber outer shell 2 and the cylindrical structure of the heat absorber inner shell 3; the gas in the gas inlet channel 19 enters the cavity between the upper surface of the heat absorber copper foam 5 and the lower bottom surface of the optical lens 9 through the gap between the lower bottom surface of the optical lens 9 and the upper edge of the heat absorber inner shell 3, then enters the cavity between the lower surface of the heat absorber copper foam 5 and the upper surface of the flow limiting mixed flow plate 12 through the holes on the heat absorber copper foam 5, and the heated gas enters the cavity between the secondary mixed flow plate 15 and the flow limiting mixed flow plate 12 through the primary mixed flow hole 21 on the flow limiting mixed flow plate 12 and finally sequentially passes through the secondary mixed flow hole 22 on the secondary mixed flow plate 15 and the exhaust pipe 23 to be discharged.
The focused sunlight heats the heat absorber copper foam 5 through the optical lens 9, the heated heat absorber copper foam 5 heats the flowing gas working medium, and because the heat absorber copper foam 5 is limited by the aperture size of the primary mixing hole 21 on the flow limiting mixing plate 12, the gas after heat exchange of the heat absorber copper foam 5 cannot quickly pass through the flow limiting mixing plate 12, and can stay in the cavity between the heat absorber copper foam 5 and the flow limiting mixing plate 12 for a period of time for further heat exchange, the gas working medium is further mixed, so that the gas working medium with uneven temperature passing through the heat absorber copper foam 5 is further subjected to heat exchange, the temperature of the flowing gas is more uniform, when the gas working medium is gathered after the flow limiting, and the pressure is increased to be equal to or greater than the preset pressure of the spring 14, the high-pressure gas pushes the gas blocking component (the gas blocking component in the embodiment is the gas blocking piece 13) to move downwards, so that the gas working medium can flow out of the pressure releasing hole 20, thereby reducing the pressure in the cavity and protecting the whole heat absorber from being damaged. After flowing out from the flow-limiting mixed flow plate 12, the gas working medium enters a cavity between the flow-limiting mixed flow plate 12 and the secondary mixed flow plate 15, and the gas is mixed again, so that the gas working medium is more uniform; then the gas is discharged through the secondary mixed flow holes 22 on the secondary mixed flow plate 15, and finally the gas flows out from the exhaust pipe 23 on the inner shell of the heat absorber, thereby completing the work of heating the gas working medium.
In addition, the intake air can be preheated in the cavity between the outer wall of the exhaust pipe 23 and the inner wall of the commutator housing 24, and since the width of the intake passage 19 between the cylindrical structure of the absorber outer housing 2 and the cylindrical structure of the absorber inner housing 3 is smaller than the width of the intake passage 19 between the inverted frustoconical structure of the absorber outer housing 2 and the inverted frustoconical structure of the absorber inner housing 3, more working fluid gas can be reserved; the heat absorber inner shell 3 is heated by the heated gas and the heat absorber inner shell 3, so that the temperature of the heat absorber inner shell 3 is increased, and the technical scheme of the embodiment can utilize the heated heat absorber inner shell 3 to preheat the remained gas again, thereby reducing heat loss.
When the porous material is used for heat exchange of the gas, the gas flow needs a certain pressure, the pressure is too high, the gas flow is too fast, the gas cannot be heated and mixed uniformly well, and the gas is discharged quickly; too low pressure, the gas passes through the porous material slowly, and the heat exchange efficiency is low. Therefore, when the pores of the porous material are larger, the gas with smaller pressure can pass through the porous material more easily, but the problems of uneven heat exchange and insufficient heat exchange exist, and at the moment, the thickness of the porous material can only be increased to increase the residence time of the gas so as to solve the problems of uneven heat exchange and insufficient heat exchange; if the porosity of the porous material is reduced, there is a problem in that it is necessary to increase the intake pressure and to increase the strength of the absorber housing.
For the heat-absorbing body copper foam 5, the pores are small, and the gas pressure is required to be higher to pass through the pores of the heat-absorbing body copper foam 5, if the thinner heat-absorbing body copper foam 5 is used and the pressure of the gas outlet side of the heat-absorbing body copper foam 5 is smaller, the gas under pressure can rapidly pass through the heat-absorbing body copper foam 5, and the problems of uneven heat exchange and insufficient heat exchange still exist; if the residence time of the gas is increased by increasing the thickness of the heat absorber copper foam 5 to solve the problems of uneven heat exchange and insufficient heat exchange, the intake pressure is greatly increased, and the pressure resistance of the heat absorber housing needs to be further improved, so that the cost is greatly increased.
In the application, the heat-absorbing body copper foam 5 and the current-limiting mixed flow pressure regulating mechanism are combined, so that on one hand, the characteristic of relatively good heat-conducting property of the heat-absorbing body copper foam 5 is utilized, and the rapid heat exchange of gas is realized; on the other hand, the time for heat exchange between the gas and the foam copper 5 of the heat absorber is prolonged through the flow-limiting mixed flow pressure regulating mechanism, and the automatic pressure relief of the heat-exchanged gas can be ensured under the condition of higher pressure, so that the safe working and running of the heat absorber are ensured. Therefore, even and sufficient heat exchange can be realized under the condition of reducing the thickness of the foam copper 5 of the heat absorber and the air inlet pressure.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (5)
1. The cavity type heat absorber is characterized by comprising a heat absorber shell, heat absorber foam metal and a current-limiting mixed flow pressure regulating mechanism, wherein the heat absorber foam metal and the current-limiting mixed flow pressure regulating mechanism are both arranged in the heat absorber shell, and the heat absorber foam metal is positioned above the current-limiting mixed flow pressure regulating mechanism; the flow-limiting mixed-flow pressure regulating mechanism comprises a flow-limiting mixed-flow plate (12), a secondary mixed-flow plate (15), a gas-blocking component and an elastic component; the lower end of the elastic component is fixedly arranged on the secondary mixed flow plate (15), and the upper end of the elastic component is fixedly connected with the air blocking component; the flow limiting mixed flow plate (12) is provided with a pressure relief hole (20) and a primary mixed flow hole (21); the gas blocking component seals the pressure relief hole (20) under the action of the elastic force of the elastic component; the secondary mixed flow plate (15) is provided with a secondary mixed flow hole (22); the gas subjected to foam metal heat exchange of the heat absorber enters a cavity between the flow-limiting mixed flow plate (12) and the secondary mixed flow plate (15) through the primary mixed flow hole (21), and is discharged out of the cavity type heat absorber through the secondary mixed flow hole (22); the pressure relief hole (20) is arranged at the center of the flow limiting mixed flow plate (12), the ratio of the total area of the pressure relief hole (20) to the total area of the primary mixed flow hole (21) is (20-30): 8, and the ratio of the total area of the secondary mixed flow hole (22) to the total area of the primary mixed flow hole (21) is (2-3): 1; the porosity of the foam metal of the heat absorber is 60% -98%, the average pore size is 1 mm-4 mm, and the porosity is 90% -98%;
the heat absorber shell comprises a heat absorber outer shell (2) and a heat absorber inner shell (3), an air inlet channel (19) is arranged between the heat absorber outer shell (2) and the heat absorber inner shell (3), the air outlet end of the air inlet channel (19) is in fluid conduction with the air inlet surface of the heat absorber foam metal, the air outlet surface of the heat absorber foam metal is in fluid conduction with the air inlet end of the flow-limiting mixed flow pressure regulating mechanism, and the air outlet end of the flow-limiting mixed flow pressure regulating mechanism is in fluid conduction with the air outlet of the cavity type heat absorber; the heat absorber outer shell (2) and the heat absorber inner shell (3) are composed of an upper cylindrical structure and a lower inverted truncated cone structure, the inner cavity of the cylindrical structure is in fluid communication with the inner cavity of the inverted truncated cone structure, and the lower edge of the cylindrical structure is fixedly connected with the upper edge of the inverted truncated cone structure; the flow limiting mixed flow plate (12) is arranged at the joint of the cylindrical structure and the inverted truncated conical structure of the inner shell (3) of the heat absorber; the width of the air inlet channel (19) between the cylindrical structure of the heat absorber outer shell (2) and the cylindrical structure of the heat absorber inner shell (3) is smaller than the width of the air inlet channel (19) between the inverted frustoconical structure of the heat absorber outer shell (2) and the inverted frustoconical structure of the heat absorber inner shell (3);
the cavity type heat absorber further comprises an optical lens (9), and the optical lens (9) is positioned at an opening at the upper end of the heat absorber shell (2); an air outlet of the air inlet channel (19) is arranged between the lower bottom surface of the optical lens (9) and the upper edge of the inner shell (3) of the heat absorber, and the air outlet of the air inlet channel (19) is in fluid conduction with an air storage chamber on the foam metal of the heat absorber; the heat-absorbing body foam metal is heat-absorbing body foam copper (5); the focused sunlight heats the heat-absorbing body foam copper (5) through an optical lens (9), and the heat-absorbing body foam copper (5) heats the flowing gas working medium; the gas in the gas inlet channel (19) enters a cavity between the upper surface of the heat absorber copper foam (5) and the lower bottom surface of the optical lens (9) through a gap between the lower bottom surface of the optical lens (9) and the upper edge of the heat absorber inner shell (3), and then enters the cavity between the lower surface of the heat absorber copper foam (5) and the upper surface of the flow limiting mixed flow plate (12) through a hole on the heat absorber copper foam (5).
2. The cavity heat absorber according to claim 1, further comprising an exhaust pipe (23) and a gas diverter (1) mounted at the bottom of the heat absorber housing (2), the upper end of the exhaust pipe (23) being in fluid communication with the chamber below the secondary mixing plate (15), the lower end of the exhaust pipe (23) passing through the gas diverter (1) and protruding below the gas diverter (1).
3. The cavity type heat absorber according to claim 2, wherein the gas reverser (1) comprises a reverser shell (24) and a filtering system, an air inlet hole (25) is formed in a side standing wall of the reverser shell (24), and the filtering system is fixedly arranged at an air inlet of the air inlet hole (25); the lower end of the exhaust pipe (23) penetrates through the bottom wall of the gas reverser (1) and extends out to the lower part of the gas reverser (1).
4. A cavity heat absorber according to claim 3, wherein the filtering system is an air filter (17), and the air filter (17) is fixedly mounted at the air inlet of the air inlet hole (25) by a screw (18) and a filter fixing plate (16), the air filter (17) being located between the end face of the air inlet hole and the filter fixing plate (16).
5. The cavity heat absorber according to claim 4, further comprising a heat absorber holder (4), a nut (6), a sealing graphite gasket (7), an inner hexagonal bolt (8), a flange (10) and a flange holder (11); the heat absorber fixer (4) is arranged in the heat absorber inner shell (3), and the heat absorber foam copper (5) is fixedly arranged in the heat absorber inner shell (3) through the heat absorber fixer (4); a fixed mounting part (26) circumferentially extends from the edge of the upper end opening of the heat absorber shell (2), the sealing graphite gasket (7) is positioned on the upper end face of the fixed mounting part (26), the flange plate (10) is pressed on the sealing graphite gasket (7), and the flange plate fixer (11) is positioned on the lower end face of the fixed mounting part (26); the inner hexagon bolt (8) sequentially penetrates through the flange plate (10), the sealing graphite gasket (7), the fixed mounting part (26) and the flange plate fixer (11) from top to bottom and is in threaded connection with the nut (6); the edge of the optical lens (9) is positioned in a groove (27) between the flange plate (10) and the fixed mounting part (26), and the outer surface of the heat absorber shell (2) is coated with a radiation heat insulation layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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