CN203240771U - Working medium high-position gathering pressure-reduction idle-sunning protection full-glass vacuum heat tube heat collection element - Google Patents

Abstract

Provided is a working medium high-position gathering pressure-reduction idle-sunning protection full-glass vacuum heat tube heat collection element. The working medium high-position gathering pressure-reduction idle-sunning protection full-glass vacuum heat tube heat collection element comprises a full-glass vacuum heat tube heat collection element body and an idle-sunning protector, wherein the idle-sunning protector comprises a heat power driving device and a heat transfer straight cylinder in a transmission connection mode. The working medium high-position gathering pressure-reduction idle-sunning protection full-glass vacuum heat tube heat collection element is characterized in that the heat transfer straight cylinder is directly connected with the hot end of a heat tube, or is connected with the hot end of the heat tube through a one-dimensional sliding pair and a heat sink in a low thermal resistance mode, the shape of the outer end portion of the heat transfer straight cylinder is matched with that of the inner surface of the tail end of a cover glass tube, a sparse core screen which is composed of a plurality of thin strip capillary liquid absorption cores is arranged inside the hot end of the heat tube, the width of each thin strip capillary liquid absorption core is 2-10mm, the sparse core screen is pressed to be attached to the inner wall of the hot end of the heat tube through an elastic clamp spring, and the area of the sparse core screen is smaller than 5% of the area of the inner wall of the hot end of the heat tube. The working medium high-position gathering pressure-reduction idle-sunning protection full-glass vacuum heat tube heat collection element can ensure that the pressure of water vapor inside the heat tube is no more than 2atm all the time only by the adoption of the low-power idle sunning protector. Due to the fact that the sparse core screen is arranged inside the heat tube, the starting time of the heat tube is shortened from more than 140 minutes needed by an original light tube to more than 10 minutes, and heat collection can be carried out for one more hour every day in winter.

Description

A working medium high position is gathered decompression empty sun protection all-glass vacuum heat collector tube element

Technical field

The utility model relates to a working medium high position and gathers decompression empty sun protection all-glass vacuum heat collector tube element.

Background technology

Vacuum heat collection pipe arranges vacuum heat-insulating layer between its cover glass tube and inner glass tube, can make the vacuum solar water heater that also can provide the domestic hot-water winter.With the solar water heater of heat-pipe vacuum heat collecting pipe manufacturing have more in the pipe anhydrous Energy Efficiency Ratio high, meet safe drinking water standard, single tube and damage the advantage such as in the same old way work.Therefore.Anhydrous solar energy evacuated water-both with hot pipe might capture the increasing market share in the pipe.

Adopt the integrated glass heat pipe have can with cover glass tube melt envelope, glass heat pipe surface can directly make absorbing film heat transfer link few, can adopt the splendid water of thermophysical property to make the advantages such as working medium.

But during air drying, heat collecting element inside heat pipe temperature can reach 230 ℃, and saturated vapor pressure corresponding to this temperature is 28.53 atmospheric pressure, and corresponding working medium filling weight is that the working medium volumetric ratio is 1.1% with the ratio of heat pipe volume, and namely per 1 liter capacity has 11 ml waters.

The pressure of inside heat pipe in the time of can reducing air drying by reducing the working medium filling weight, take device of working medium as example: when working medium filling weight/heat pipe plot ratio 0.5% during from 5 milliliters/1000 milliliters are reduced to 2 milliliters/1000 milliliters 0.2%, correspondingly its highest saturated vapor pressure is reduced to about 3.7 atmospheric pressure of 140 ℃ from about 10 atmospheric pressure of 180 ℃, and inside heat pipe when continuing to be warming up to 180 ℃ from 140 ℃ of about 3.7 atmospheric high-vapor-pressures internal pressure only have about 4 atmospheric pressure.But the internal pressure when the working medium filling weight can not be only with air drying sometimes decides.For a working medium filling weight/heat pipe plot ratio be 0.2%, the heat pipe of 1000 milliliters of internal capacities, 2000 millimeters of length, if internal pressure is no more than 4 atmospheric pressure when making 230 ℃ of air dryings, then the working medium filling weight is about 1.8 milliliters.Be light-pipe structure even problem is described heat pipe, when tilting about 45 degree work, the condensed water of cold junction, the circulating water in hot junction add that 0.353 milliliter of sum of the water yield of 85 ℃ of water vapours can be far away from 1.8 milliliters.

Make working medium filling weight/heat pipe plot ratio greater than 0.2% even 0.3% in order to satisfy heat pipe normal operation, and guarantee glass heat pipe not because air drying and bombing must be taked the empty sun protection measure.

Chinese invention patent 2009101951003 anti-air drying all-glass vacuum heat collector tube elements; disclosed a kind of empty sun protection all-glass vacuum heat collector tube element; consist of by between vacuum heat collection element absorber and cover glass-tube, controlled heat transfer path being set; controlled heat transfer path is comprised of movable heat transfer piece and actuator, it is characterized in that containing the heating power transducing actuator that is connected with vacuum heat collection element absorber low thermal resistance.Because this patent is not specially for the gravity assisted heat pipe heat collecting element, thereby specific aim is not strong; The uniformity of the original product of bimetal leaf heating power transducing actuator that it adopts is just bad, restorable ability can reduce again after temperature distortion repeatedly, and operating point settings, control variables input, comparison, transducing and the Power supply that its control system of bearing is relevant and execution function far can not normally effectively be worked because precision is affected 20 year possible projected life of heat collecting element.

Fig. 4 provides the light-pipe structure gravity assisted heat pipe structural representation of a tiltably-mounted.

Among Fig. 4, heat pipe 1 is made by shell and internal working medium.Its operation principle is: heat energy is i.e. side by side inwards arrow marked position input from the hot junction of below, make the vaporization of being heated of the working medium at heat pipe 1 inner bottom place, steam is under the effect of pressure reduction, upwards advance to the heat pipe cold junction and be arrow side by side outwards marked position emit heat energy and be supplied to load and be condensed into the cold junction of liquid below under Action of Gravity Field, being back to, in the vaporization of again being heated of hot junction working medium ..., constantly circulation realizes the two phase flow heat transfer circulation thus.Heat pipe has excellent heat-transfer capability, heat flow density ability to transform and isothermal characteristics.If 100 watts of heat pipe 1 hot junction inputs, then its cold junction output is the highest can reach 97 watts even higher.

If attempt heat pipe 1 to Fig. 4 only from following input heat energy, and do not take heat energy away, then heat pipe 1 steam inside is pressed and can sharply be risen.If heat pipe 1 adopts water as working medium and abundant, then when heat pipe 1 temperature reached 230 ℃, inner maximum pressure can reach 28.53 atmospheric pressure.

If attempt the from top to bottom comprehensively heating and take out heat energy from following a section of whole heat pipe 1 length 3% of accounting for that for example begins from the bottom a little more than heat pipe 1 bottom local of the heat pipe 1 of Fig. 4, namely only make position that the bottom accounts for heat pipe 1 total length 3% forward simultaneously as overlapping cold junction, then the vapour pressure of heat pipe 1 inside can drop to the saturated vapor pressure corresponding with the temperature of following cold junction.When for example water is as working medium, 100 ℃ of the temperature of maintenance heat pipe 1 following overlapping cold junction, even then top other parts are heated to 230 ℃, because the liquid refrigerant of heat pipe 1 inside all is collected in described overlapping cold junction, heat pipe 1 hot junction above except described overlapping cold junction is not owing to there is working medium to replenish whole drying up, and the two phase flow heat transfer mechanism has not existed.The steam pressure of heat pipe 1 inside 1 atmospheric pressure of also only having an appointment.

An example of overlapping cold junction be thermotube wall with absorbing film, absorb sunshine and input as heat energy, connect described thermotube wall with the Thermal Conduction Equipment low thermal resistance simultaneously and heat energy shifted.

Thisly make that heat pipe 1 is in tilted layout, heat energy is inputted and only perhaps do not had what meaning with following a bit of design as overlapping cold junction in other occasions above heat pipe 1, but the empty sun protection that is used for solar collection element, because only need minimum a part of heat radiation power---when this part heat radiation power was used for guaranteeing that air drying occurs, the peak of the initial stage inside heat pipe vapour pressure that the empty sun protection device begins to work was no more than setting value; This part heat radiation power also is greater than described overlapping cold junction as the heat energy input power in hot junction---thus have radiating element volume compact, dependable performance, heat radiation power little, on the venting of vacuum heat-insulating layer less, on absorber to block impact little and can utilize the heat collecting element tail end as the advantage of heat dissipation interface.

Can see that the needed heat radiation power of less, the described empty sun protection device of the area of overlapping cold junction is also less, more favourable.Actual heat collecting element needs the device of tail box and so on to settle.The tail box can hide the tail end of heat collecting element.The part that is hidden by the tail box does not belong to overlapping cold junction.Why also can use overlapping cold junction; be because some heat collecting element empty sun protection device relatively be fit to be installed on vacuum heat-insulating layer drum-shaped section or; heat collection element cover glass pipe is with necking segment and be to adopt to assemble inner glass tube after necking segment forms, and then draws tail pipe to be called for short the technique of post-tensioning tail pipe to cover glass tube circle envelope.If the round end-blocking that post-tensioning tail pipe technique forms is not suitable for heat radiation, dispel the heat from described round end-blocking cover glass tube drum-shaped section up with regard to needing to utilize.Heat pipe or the inner glass tube end section corresponding with described drum-shaped section belong to overlapping cold junction.

China's 912050845 utility model electric cooker automatic magnetic temperature detect switch (TDS)s have been introduced a kind of pyromagnetic force inverting element operation principle of utilizing.

Summary of the invention

The purpose of this utility model is to provide a working medium high position to gather decompression empty sun protection all-glass vacuum heat collector tube element.

The technical scheme in the invention for solving the technical problem: with all-glass vacuum heat collector tube element and the empty sun protection device that places in the described heat collecting element tail end vacuum heat-insulating layer, form a working medium high position and gather decompression empty sun protection all-glass vacuum heat collector tube element.All-glass vacuum heat collector tube element is made with cover glass tube sealing-in integral type inner glass tube heat pipe.Described heat collecting element is vertical or tilt to install the work of described heat pipe dependence gravity.Described empty sun protection device passes hot linked thermodynamic-driven device by one with described heat pipe hot junction, is in transmission connection with the thermodynamic-driven device or forms with the integrally manufactured heat straight-tube of thermodynamic-driven device.Described empty sun protection device has two kinds of stable states: heat straight-tube is stretched out the unlatching heat conduction state that conducts heat when connecting the cover glass tube tail end; Heat straight-tube the adiabatci condition of closing when connecting the cover glass tube tail end of not conducting heat of retracting.Described thermodynamic-driven device comprises temperature-sensitive permanent-magnet steel driving element, bimetallic strip driver spare, memory alloy actuator spare, bellows driving element.Heat straight-tube adopts one-dimensional movement auxiliary structure low thermal resistance to be connected with inner glass tube or place, bottom, heat pipe hot junction; Perhaps heat straight-tube adopts one-dimensional movement auxiliary structure low thermal resistance to be connected with a heat sink, and described heat sink is connected with place, bottom, heat pipe hot junction low thermal resistance.Heat straight-tube can move forward and backward along the heat collecting element direction of axis line.The outer end shape of heat straight-tube and cover glass tube tail end inner surface match.A sparse core net that is comprised of the slice capillary wick of 2 to 10 millimeters of some width is set in inside, heat pipe hot junction, and sparse core net adopts elastic circlip to overlay in heat pipe hot junction inwall; The area of sparse core net is less than 5% of described heat pipe hot junction inner wall area.

Can also make described cover glass tube tail end inner surface low thermal resistance connect a heat radiation paster; The heat transfer state of heat radiation paster and heat straight-tube changes according to the state of thermodynamic-driven device.

Can also make described sparse core net be formed by several annular fillet capillary wick according to circumferential layout.

Can also make between heat radiation paster and the heat sink adopts the high thermal resistance of jump ring to be connected; Perhaps the cover glass tube tail end is inboard is connected by a high thermal resistance of jump ring with place, bottom, heat pipe hot junction.

Can also make described thermodynamic-driven device comprise a temperature-sensitive permanent-magnet steel and a soft iron; The temperature-sensitive permanent-magnet steel is connected with inner glass tube or heat pipe hot junction low thermal resistance by a thermal conductance; Soft iron is tied and can moves forward and backward and be in transmission connection by transmission steel wire and heat straight-tube along the heat collecting element direction of axis line.

Can also make 40 ± 5 ℃ of the water temperatures in 700 ± 50 watts/square metre of sunshine exposures, the described heat pipe cold junction outside, heat collecting element axial line be that the north-south is in tilted layout and the angle of its axial line and incident sunlight in 90 ± 20 ° of scopes under the condition, sparse core net is held 25% of the quality of liquid refrigerant≤its maximum liquid refrigerant volume of holding.

Can also make: the maximum liquid refrigerant volume of holding of described sparse core net 〉=4 milliliters; 40 ± 5 ℃ of the water temperatures in 700 ± 50 watts/square metre of sunshine exposures, the described heat pipe cold junction outside, heat collecting element axial line be that the north-south is in tilted layout and the angle of its axial line and incident sunlight in 90 ± 20 ° of scopes under the condition, described sparse core net is held the quality of liquid refrigerant≤0.9 milliliter.

Can also make described heat collecting element tail end for from heat collecting element tail end bottom outer surface, being no more than the part of heat collecting element total length 6% forward.

The beneficial effects of the utility model: the utility model working medium high position gather decompression empty sun protection all-glass vacuum heat collector tube element adopt the heat radiation of place, heat pipe bottom collect liquid refrigerant in place, bottom, heat pipe hot junction, the empty sun protection design of blocking-up inside heat pipe two phase flow heat transfer, heat radiation power can reduce greatly.For example: a heat collecting element of exporting 70 watts, 3 milliliters of working medium filling weights.Employing dispels the heat to prevent the technical scheme of heat pipe bombing at the uniform controlled heat transfer path of heat pipe hot end surface, the heat radiation power of controlled heat transfer path is 40 watts, the inside heat pipe temperature is the highest to be also had more than 150 ℃, and corresponding water vapor pressure still can reach the voltage endurance capability that 4.8 atmospheric pressure exceed 58 millimeters of external diameters, 1.8 millimeters inner glass tubes of wall thickness.The utility model is for the heat collecting element of 70 watts of same outputs, and decompression empty sun protection heat transfer path only needs 10 watts of heat radiation powers, just can come the water of heat absorbing glass inside heat pipe when air drying occurs with the speed of 0.25 ml/min.After air drying begins about 6 minutes, although at that time heat pipe on the sunny side the temperature on surface raise about 30 ℃, the heat pipe hot junction inner except the place, bottom all dry, vapour pressure less than 1.5 atmospheric pressure.The heat radiation power of saving 30 watts makes cost that larger reduction is arranged, and the minimizing heat transfer path increases substantially venting 75% and the reliability of vacuum heat-insulating layer.Key is the bombing problem that can effectively solve the major diameter heat pipe.The utility model adopts a small-power empty sun protection device just can guarantee that the inside heat pipe water vapor pressure is no more than 2 atmospheric pressure all the time, and does not affect the normal operation of heat collecting element fully.

The heat straight-tube heat transfer area is large, rigidity is strong, utilize the heat collecting element bottom make up heat transfer path few to the absorption resource occupation of heat collecting element, and be fit to heat collecting element heat pipe hot junction from the empty sun protection of the distant metal heat pipe of cover glass tube straight section, interior glass finned plate pipe and eccentric heat pipe.

Embedded straight tube vacuum heat-pipe heat collecting element decompression empty sun protection device adopts two temperature-sensitive permanent-magnet steel driving elements uniform; minimumly can replace original four paws jump ring with a wire circlip; increase again two blocks of temperature-sensitive permanent-magnet steels, two blocks of soft irons, two springs, two transmission steel wires, a temperature-sensitive permanent-magnet steel thermal conductance with shading, 10 parts of a heat straight-tube, and connect described parts with the high thermal resistance of wire circlip.Simple for structure, easy to assembly.

Temperature-sensitive permanent-magnet steel driving element high conformity, good reproducibility, control accuracy height, long service life, performance are satisfactory.

Adopt by several according to the sparse core net that the annular fillet capillary wick of circumferential layout forms at inside heat pipe, make heat pipe start-up time from more than 140 minute of original light pipe, foreshorten to more than 10 minute, be equivalent to many thermal-arrests more than hour every day in winter.Thereby both having accelerated to greatest extent heat pipe starts; The pressure of glass heat pipe inside keeps low level when increasing hardly again the working medium filling weight and making air drying.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is that a working medium high position is gathered decompression empty sun protection all-glass vacuum heat collector tube element and faced structural representation.

Fig. 2 is that a working medium high position is gathered TV structure schematic diagram on the decompression empty sun protection all-glass vacuum heat collector tube element.

Fig. 3 is that Fig. 1 looks the sectional structure schematic diagram on the left side at heat straight-tube 7 places.

Fig. 4 is the light-pipe structure gravity assisted heat pipe structural representation of a tiltably-mounted.

Fig. 5 is the expanded view of a slice heat straight-tube.

Fig. 6 is an all-glass vacuum solar energy collection tube structural representation.

1. heat pipes among the figure; 2. cover glass tube; 3. inner glass tube; 4. heat radiation paster; 5. heat sink; 6. temperature-sensitive permanent-magnet steel driving element; 7. heat straight-tube; 8. temperature-sensitive permanent-magnet steel; 9. soft iron; 10. thermal conductance; 11. shadow shield; 12. plate washer; 13. transmission steel wire; 14. spring; 15. connecting plate; 16. four paws jump ring; 17. square hole; 18. breach; 19. annular fillet capillary wick; 20. annular spring.

The specific embodiment

Fig. 1, Fig. 2 and Fig. 3 provide embodiment of the utility model.

Among Fig. 1 to 3; in the vacuum heat-insulating layer between all-glass vacuum solar energy collection tube cover glass tube 2 tail ends and heat pipe 1 tail end; an embedded straight tube vacuum heat-pipe heat collecting element decompression empty sun protection device is set, forms a decompression empty sun protection all-glass vacuum heat collector tube element.Empty sun protection device is comprised of heat radiation paster 4, heat sink 5, temperature-sensitive permanent-magnet steel driving element 6 and heat straight-tube 7.The shape of heat radiation paster 4 outer surfaces and the shape of cover glass tube 2 tail end inner surfaces match.0.22 millimeter of heat radiation paster 4 thickness, 40 millimeters of width.Heat radiation paster 4 usefulness jump rings overlay in cover glass tube 2 inwalls.0.22 millimeter of heat sink 5 thickness, 40 millimeters of width.Temperature-sensitive permanent-magnet steel driving element 6 comprises a temperature-sensitive permanent-magnet steel 8 and a soft iron 9; Temperature-sensitive permanent-magnet steel 8 is connected with inner glass tube 3 low thermal resistances by thermal conductance 10; Be provided with shadow shield 11 above the temperature-sensitive permanent-magnet steel 8, prevent that the temperature-sensitive permanent-magnet steel 8 of sunshine direct projection in being in vacuum heat-insulating layer from making its misoperation.Soft iron 9 is subjected to both sides plate washer 12 constraint can do to move forward and backward and be in transmission connection by transmission steel wire 13 and heat straight-tube 7 along the heat collecting element direction of axis line, and soft iron 9 is subjected to spring 14 thrust to pushed away from permanent-magnet steel 8 or has the trend that pushed away from permanent-magnet steel 8.0.22 millimeter of heat straight-tube 7 thickness, 40 millimeters of width.Adopt one-dimensional movement auxiliary structure low thermal resistance to be connected between heat straight-tube 7 and the heat sink 5, heat straight-tube 7 can be done stretch out retraction along the heat collecting element direction of axis line and be moved forward and backward.Heat sink 5 parcel low thermal resistances connect place, bottom, heat pipe 1 hot junction and overlay on inner glass tube 3 with jump ring.The outer end shape of heat straight-tube 7 matches with heat radiation paster 4 inner surfaces.0.22 millimeter of thermal conductance 10 thickness, 20 millimeters of width, be rolled into tubular.Thermal conductance 10 is connected with heat sink by the high thermal resistance connection of a slice connecting plate 15 rigidity.Cover glass tube 2 tail ends inboard with inner glass tube 3 tail ends between be connected location (the four paws jump ring does not draw, but illustrates with Fig. 6 specially for for purpose of brevity) between realization cover glass tube 2 and the inner glass tube 3 by four paws jump ring 16 high thermal resistances in Fig. 1,2.

Several annular fillet capillary wick 19 according to circumferential layout are set in inside, heat pipe 1 hot junction form a sparse core net.Annular fillet capillary wick 19 usefulness annular springs 20 overlay in heat pipe 1 hot junction inwall.1 meter 8 of the hot end length of heat pipe 1; 5 millimeters of the width of annular fillet capillary wick 19.The area sum of annular fillet capillary wick 19 is less than 2.8% of described heat pipe 1 hot junction inner wall area.

The making material of heat radiation paster 4, heat sink 5, heat straight-tube 7 comprises steel plate, aluminium sheet and copper coin.

The operation principle of Fig. 1 to 3 embodiment: the heat collecting element that described decompression empty sun protection device is installed when embedding normally is in tilted layout and when not being in the air drying state; temperature-sensitive permanent-magnet steel 8 temperature that are connected with inner glass tube 3 low thermal resistances by thermal conductance 10 do not reach the loss of excitation temperature; temperature-sensitive permanent-magnet steel 8 holds soft iron 9 with heat straight-tube 7 past Zolas; make heat straight-tube not contact the heat radiation paster, empty sun protection device is in closes adiabatci condition.The normal thermal-arrest of heat collecting element.Marginal position when dotted line represents heat straight-tube 7 retraction among the figure.

When heat collecting element was in the air drying state, temperature-sensitive permanent-magnet steel 8 temperature rising magnetic force disappeared, and spring 14 is pushed soft iron 9 and heat straight-tube 7 to the right side, heat straight-tube 7 were stretched out conduct heat to connect heat radiation paster 4, and empty sun protection device is in the heat conduction state of opening.Inner glass tube 3 is that the heat energy in heat pipe 1 hot junction is lost to environment continually by empty sun protection device.The steam of heat pipe 1 inside flows to bottom place and condenses and be collected in the place, bottom under differential pressure action, clamp down on heat pipe 1 internal pressure and be in all the time low level, guarantees that heat collecting element can bombing do not realize the empty sun protection of heat collecting element.Because the constraint of plate washer 12, maximum 2 millimeters of the distance that soft iron 9 moves right can attract soft iron 9 to return when temperature-sensitive permanent-magnet steel 8 magnetic force recover after can guaranteeing so once again.

Heat collecting element breaks away from the air drying state later on, and temperature-sensitive permanent-magnet steel 8 temperature reduce magnetic force to be recovered and attract soft iron 9 heat straight-tube 7 to be retracted do not conduct heat to connect heat radiation paster 4, and empty sun protection device is in closes adiabatci condition, and heat collecting element can work again.

Allow annular fillet capillary wick 21 to dry up or partly dry up during heat pipe 1 normal operation, so annular fillet capillary wick 19 is not usually held working medium when heat pipe 1 work.When heat pipe 1 normal operation finishes, the condensate water evaporation of heat pipe 1 cold junction inner surface, comprise that the whole or most working medium of all working medium of this part working medium by annular fillet capillary wick 19 stickings, improve the working medium position that former light pipe heat pipe is collected in heat pipe 1 bottom.Annular fillet capillary wick 19 places absorbed solar thermal energy as much as possible and accelerate to start when the annular fillet capillary wick 19 that is distributed in whole heat pipe 1 hot junction was conducive to heat pipe 1 and starts.

Fig. 1 to 3 embodiment does not adopt heat radiation paster and heat sink for the all-glass vacuum heat collector tube element of cover glass tube diameter 70, inner glass tube diameter 58, and the heat radiation power of described empty sun protection device also can reach more than 10 watts.

The temperature-sensitive permanent-magnet steel driving element 6 that Fig. 1 is connected with Fig. 2 changes bimetal leaf thermodynamic-driven device into or changes memory alloy actuator spare into or change into heat straight-tube 7 being stretched out conducting heat and connect, and working medium is locked in the empty sun protection mechanism that place, bottom, heat pipe 1 hot junction realizes heat pipe 1 inner pressure relief.

Fig. 5 provides the expanded view of heat straight-tube 7.

Among Fig. 5, heat straight-tube 7 is unfolded.Its square hole 17 is established for avoiding the four paws jump ring.Breach 18 is established for being processed into the shape that matches with cover glass tube tail end medial surface.

Fig. 6 provides the structural representation of an all-glass vacuum thermal-collecting tube.

Among Fig. 6, arrange sealing-in with cover glass tube 2 and inner glass tube 3 nested, concentric, make an all-glass vacuum heat collector tube element.Inner glass tube 3 from sealing-in place stretch out forward and inner vacuum pumping loading working medium after sealed-off make a heat pipe 1, the length in heat pipe 1 hot junction is 1.8 meters.The outer surface of inner glass tube 3 is made absorbing film.Four paws jump ring 16 is arranged between cover glass tube 2 tail ends and inner glass tube 3 tail ends.

Claims (8)

1. a working medium high position is gathered decompression empty sun protection all-glass vacuum heat collector tube element, by all-glass vacuum heat collector tube element and place the empty sun protection device in the described heat collecting element tail end vacuum heat-insulating layer to form, all-glass vacuum heat collector tube element is made with cover glass tube sealing-in integral type inner glass tube heat pipe, vertical or the installation of tilting of described heat collecting element, described heat pipe relies on gravity work, described empty sun protection device passes hot linked thermodynamic-driven device by one with described heat pipe hot junction, be in transmission connection or the heat straight-tube composition integrally manufactured with the thermodynamic-driven device with the thermodynamic-driven device, described empty sun protection device has two kinds of stable states: heat straight-tube is stretched out the unlatching heat conduction state that conducts heat when connecting the cover glass tube tail end; Heat straight-tube the adiabatci condition of closing when connecting the cover glass tube tail end of not conducting heat of retracting; Described thermodynamic-driven device comprises temperature-sensitive permanent-magnet steel driving element, bimetallic strip driver spare, memory alloy actuator spare, bellows driving element, it is characterized in that heat straight-tube adopts one-dimensional movement auxiliary structure low thermal resistance to be connected with inner glass tube or place, bottom, heat pipe hot junction; Perhaps heat straight-tube adopts one-dimensional movement auxiliary structure low thermal resistance to be connected with a heat sink, and described heat sink is connected with place, bottom, heat pipe hot junction low thermal resistance; Heat straight-tube can move forward and backward along the heat collecting element direction of axis line; The outer end shape of heat straight-tube and cover glass tube tail end inner surface match; Contain a sparse core net that is comprised of the slice capillary wick of 2 to 10 millimeters of some width in inside, heat pipe hot junction, sparse core net adopts elastic circlip to overlay in heat pipe hot junction inwall; The area of sparse core net is less than 5% of described heat pipe hot junction inner wall area.

2. according to heat collecting element claimed in claim 1, it is characterized in that described cover glass tube tail end inner surface low thermal resistance connects a heat radiation paster; The heat transfer state of heat radiation paster and heat straight-tube changes according to the state of thermodynamic-driven device.

3. according to heat collecting element claimed in claim 1, it is characterized in that described sparse core net is formed by several annular fillet capillary wick according to circumferential layout.

4. according to heat collecting element claimed in claim 1, adopt the high thermal resistance of jump ring to be connected between it is characterized in that dispelling the heat paster and the heat sink; Perhaps the cover glass tube tail end is inboard is connected by a high thermal resistance of jump ring with place, bottom, heat pipe hot junction.

5. according to heat collecting element claimed in claim 1, it is characterized in that described thermodynamic-driven device comprises a temperature-sensitive permanent-magnet steel and a soft iron; The temperature-sensitive permanent-magnet steel is connected with inner glass tube or heat pipe hot junction low thermal resistance by a thermal conductance; Soft iron is tied and can moves forward and backward and be in transmission connection by transmission steel wire and heat straight-tube along the heat collecting element direction of axis line.

6. according to claim 1 or 2 described heat collecting elements, it is characterized in that 40 ± 5 ℃ of the water temperatures in 700 ± 50 watts/square metre of sunshine exposures, the described heat pipe cold junction outside, heat collecting element axial line be that the north-south is in tilted layout and the angle of its axial line and incident sunlight in 90 ± 20 ° of scopes under the condition, sparse core net is held 25% of the quality of liquid refrigerant≤its maximum liquid refrigerant volume of holding.

7. according to claim 1 or 2 described heat collecting elements, it is characterized in that: the maximum liquid refrigerant volume of holding of described sparse core net 〉=4 milliliters; 40 ± 5 ℃ of the water temperatures in 700 ± 50 watts/square metre of sunshine exposures, the described heat pipe cold junction outside, heat collecting element axial line be that the north-south is in tilted layout and the angle of its axial line and incident sunlight in 90 ± 20 ° of scopes under the condition, described sparse core net is held the quality of liquid refrigerant≤0.9 milliliter.

8. according to claim 1 or 2 described heat collecting elements, it is characterized in that described heat collecting element tail end is for being no more than the part of heat collecting element total length 6% forward from heat collecting element tail end bottom outer surface.

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