CN203216129U

CN203216129U - Thin strip capillary wick working fluid high-level accumulation all-glass vacuum heat pipe heat collection element

Info

Publication number: CN203216129U
Application number: CN 201320239312
Authority: CN
Inventors: 周雪君
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-05-04
Filing date: 2013-05-04
Publication date: 2013-09-25
Anticipated expiration: 2023-05-04

Abstract

The utility model relates to a thin strip capillary wick working fluid high-level accumulation all-glass vacuum heat pipe heat collection element. The thin strip capillary wick working fluid high-level accumulation all-glass vacuum heat pipe heat collection element comprises a cover glass pipe and an inner glass pipe, and the cover glass pipe and the inner glass pipe are concentrically nested, arranged, sealed and connected; the inner glass pipe extends forward from the sealed and connected part of the inner glass pipe, and the inner glass pipe is sealed off for producing a heat pipe after the interior of the inner glass pipe is vacuum-pumped and filled with a working fluid; an absorption film is contained in the outer surface of the inner glass pipe, namely the glass heat pipe, and the thin strip capillary wick working fluid high-level accumulation all-glass vacuum heat pipe heat collection element is characterized in that a thin strip capillary wick with the width of 2-30mm is contained in the heat end of the heat pipe, and the thin strip capillary wick is pressed on the inner wall of the heat end of the heat pipe by adopting an elastic clamp spring; the length of the thin strip capillary wick is 10-50% of the length of the heat end of the heat pipe; the distance from the lower end of the thin strip capillary wick to the bottom end of the heat pipe is 0-200mm. The thin strip capillary wick working fluid high-level accumulation all-glass vacuum heat pipe heat collection element disclosed by the utility model can accelerate the start of the heat pipe to the greatest extent, and also keep the internal pressure of the glass heat pipe at low level during air drying.

Description

A slice capillary wick working medium high position is gathered all-glass vacuum heat collector tube element

Technical field

The utility model relates to a slice capillary wick working medium high position and gathers all-glass vacuum heat collector tube element.

Background technology

Vacuum heat collection element arranges a 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 anhydrous Energy Efficiency Ratio height in the pipe, meet the safe drinking water standard, single tube damages advantage such as in the same old way work.Therefore.Anhydrous solar energy evacuated heat pipe water heater might capture the increasing market share in the pipe.

Existing a kind of workload fills all-glass heat pipe vacuum collector tube solar water heater seldom, and the heat pipe inwall adopts light-pipe structure, heat-pipe vacuum heat collecting pipe about 45 degree that tilt to install.Under non-heat exchange state, can observe the heat pipe bottom has liquid refrigerant to gather.

To its carry out and pipe in the all-glass vacuum thermal-collecting tube solar water heater check experiment of water, slow back is fast earlier to find the intensification situation of heat pipe solar energy water heater.Judgement is that the heat pipe start-up course is long, the startup stage of heat pipe, the heat collector tube element can not full power operation thereby heat up slow, the operation of heat collector tube element full power thereby quick heating after heat pipe starts.

The heat pipe of investigating all-glass heat pipe vacuum collector tube starts: because the working medium that is collected in the heat pipe bottom makes these liquid refrigerants can not participate in the two phase flow heat transfer circulation rapidly usually because its temperature of minute surface shading that is formed by getter rises slowly.Simultaneously, though because the temperature at inner other positions, heat pipe hot junction is high is in dry state and can not contributes to thermal-arrest in a very long time.Rely on the glass heat pipe tube wall heat transfer near the bottom to make liquid refrigerant vaporization and circulation participate in two phase flow heat transfer gradually later on, heat pipe is finished start-up course and is entered normal operating conditions.Problem is in the winter time, and the start-up course of heat pipe may continue more than two hours, and this makes that the performance of some glass heat pipe thermal-collecting tube can not be obviously good than the all-glass vacuum thermal-collecting tube of managing interior water, and the advantage of heat pipe fails to give full play to.

Glass surface is not suitable for processing stria to form bigger capillary lift.

Employing arranges to have enough large-area core nets at the glass heat pipe inner surface, though can utilize capillarity to solve the long problem of heat pipe start-up course, but can make the bigger increase of cost, more seriously also can fill more, the too high increase greatly that has a big risk that causes the bombing accident of vapour pressure when making empty solarization of working medium because of inside.When 0.2% when for example working medium filling weight/heat pipe plot ratio is from 2 milliliters/1000 milliliters are brought up to 5 milliliters/1000 milliliters 0.5%, the highest saturated vapor pressure increases to about 10 atmospheric pressure of 180 ℃ from about 3.7 atmospheric pressure of 140 ℃, but 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.Because the glass voltage endurance capability is limited, so the liquid refrigerant position height in the time of should managing to raise heat pipe and start is accelerated to start, the least possiblely when heat pipe work again hold back liquid refrigerant with minimizing working medium filling weight.

China's utility model patent 200410012193.9 Explosion-proof all-glass solar energy vacuum collecting tubes have disclosed a kind of Explosion-proof all-glass solar energy vacuum collecting tube, and the liquid refrigerant filling weight is 0.1～0.5%V in its heat pipe, and wherein V is the volume in the heat pipe.All be converted into vapour phase when making it reach a certain critical-temperature, when temperature continued to raise, pressure raise according to the rule of vapour phase, thereby had significantly reduced the operating pressure in the heat pipe under the condition of high temperature ...Simultaneously, in heat pipe, set up sorbing material, to guarantee that heat pipe quick starts again.But this utility model patent comprises that in heat pipe sorbing material sticking working medium that heat pipe evaporator section middle part arranges adds quick heating pipe and starts this mode and still can bring when increasing working medium filling weight and empty the solarization internal pressure or start still slower problem.Suppose: set originally and be limited to 4 atmospheric pressure on 44 millimeters of inner glass tube internal diameters, 58 millimeters of cover glass tube external diameters, long 2 meters the internal pressure of all-glass vacuum heat collector tube pipe, emptyly shine 230 ℃ of maximum temperatures, water is made working medium, calculating can get about 3 liters of inner glass tube volume.Look into the saturated vapor pressure table of water vapour as can be known: whole working medium filling weight of working medium vaporization just in the time of 135 ℃, its saturated vapor pressure is 3.2 atmospheric pressure and when shining 230 ℃ of temperature in high-altitude, internal pressure reaches 4 atmospheric pressure and namely equals the inner glass tube internal pressure limit.And the quality volumetric ratio of steam is 1.7 milliliters/liter can check in 135 ℃ the time.The working medium filling weight of this thermal-collecting tube is 1.7 milliliters/liter=5.1 milliliters of 3 liters of *.(5.1 milliliters of working medium are on the low side for existing thermal-collecting tube, can occur drying up in the bottom, hot junction, but this problem do not done expansion here).At this moment, quick heating pipe starts and imbibition material is set in the middle part of inside heat pipe in order to add.Suppose that the imbibition material that increases carries sticking 1.5 milliliters of working medium have altogether been arranged when the heat pipe operate as normal, and therefore aggravate inside heat pipe hot junction dry-out, dry hot junction does not participate in heat exchange has a greatly reduced quality the efficient of thermal-collecting tube.For fear of the heat-collecting capacity loss that brings because the hot junction is dry.Must increase the working medium filling weight remedies heat pipe when work and is put forward that part of working medium that sticking has by imbibition material.Suppose that the working medium filling weight that increases also is 1.5 milliliters, the quality volumetric ratio of the steam when then working medium is just all vaporized from 1.7 milliliters/go up and rise to 2.2 milliliters/liter, the critical-temperature of the highest saturated vapor pressure correspondence at this moment rises to 145 ℃ from 135 ℃; Correspondingly, when shining 230 ℃ of temperature in high-altitude, inside heat pipe pressure is increased to 5 atmospheric pressure from 4 atmospheric pressure.Conclusion is: increase imbibition material and increase the working medium filling weight in order to accelerate to be enabled in middle part, heat pipe hot junction, shine under the temperature in high-altitude, the thermal-collecting tube pressure inside can surpass original pressure of setting and increase to 5 atmospheric pressure from 4 atmospheric pressure and exceed 25%; Be equivalent to reduce winter a day heat-collecting capacity 35% and will prolong two hours without imbibition material heat pipe start-up course.Also have, only 1.5 milliliters of working medium of sticking are still not enough for sorbing material.

Summary of the invention

The purpose of this utility model is to provide a slice capillary wick working medium high position to gather all-glass vacuum heat collector tube element.

The technical scheme in the invention for solving the technical problem: make a slice capillary wick working medium high position and gather all-glass vacuum heat collector tube element, comprise cover glass tube and inner glass tube.Cover glass tube and inner glass tube nested, concentric are arranged sealing-in.Inner glass tube from sealing-in place stretch out forward and inside vacuumize can working medium after sealed-off make a heat pipe, inner glass tube is that the outer surface of glass heat pipe contains absorbing film.The slice capillary wick of 2 to 30 millimeters of width is set in inside, heat pipe hot junction, and the slice capillary wick adopts elastic circlip to overlay in heat pipe hot junction inwall; The length of slice capillary wick is 10 to 50% of heat pipe hot junction length; The lower end of slice capillary wick is 0 to 200 millimeter from the distance of heat pipe bottom.

Can also make 40 ± 5 ℃ of the water temperatures in 700 ± 50 watts/square metre of sunshine exposures, the 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: the slice capillary wick hold liquid refrigerant quality≤its maximum liquid refrigerant volume of holding 25%.

Can also make: the maximum liquid refrigerant volume of holding of slice capillary wick 〉=4 milliliters; 40 ± 5 ℃ of the water temperatures in 700 ± 50 watts/square metre of sunshine exposures, the 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, the slice capillary wick is held quality≤0.9 milliliter of liquid refrigerant.

The beneficial effects of the utility model: the utility model slice capillary wick working medium high position is gathered all-glass vacuum heat collector tube element, in described heat collecting element glass heat pipe inside the slice capillary wick is set, when the sun sets, the reverse work of described glass heat pipe: the evaporation of the liquid refrigerant of the former heat pipe cold junction inner surface that is connected with the heating load low thermal resistance is also condensed at former heat pipe hot junction inner surface, thereby gathers more and held back the position of having raised working medium by sticking during downward trickling arrival slice capillary wick when former heat pipe hot junction inner surface liquid refrigerant.When the sun came out in second day, in a single day the heat pipe hot junction was heated, and the liquid refrigerant that is held by the slice capillary wick evaporates rapidly and the participation two phase flow heat transfer.The slice capillary wick is carefully grown, because long, the wide startup of the solar energy heat absorbing area that relates to is rapid; Because thin and place the bottom in heat pipe hot junction, during the heat pipe operate as normal, for example less than 0.3 milliliter, the increase of internal pressure was very limited when it shone sky less for the liquid refrigerant that the slice capillary wick is held.The utility model slice capillary wick working medium high position is gathered the various solar energy heat collectors that all-glass vacuum heat collector tube element is made, its heat pipe start-up time was from more than 140 minute of original light pipe, foreshorten to more than 20 minute, be equivalent to many thermal-arrests more than hour every day in winter.Thereby both having accelerated heat pipe to greatest extent starts; The glass heat pipe pressure inside keeps low level when making empty the solarization again.

Description of drawings

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

Fig. 1 is that a slice capillary wick working medium high position is gathered all-glass vacuum heat collector tube component structure schematic diagram.

1. cover glass tubes among the figure; 2. inner glass tube; 3. heat pipe; 4. slice capillary wick; 5. elastic circlip.

The specific embodiment

Fig. 1 provides embodiment of the utility model.

Among Fig. 1, arrange sealing-in with cover glass tube 1 and inner glass tube 2 nested, concentric, make the integral type all-glass vacuum heat collector tube element that a slice imbibition core is raised working medium.Inner glass tube 2 from sealing-in place stretch out forward and inside vacuumize can working medium after sealed-off make a heat pipe 3.The outer surface of inner glass tube 2 is made absorbing film.Vertical or the installation of tilting of integrated glass hot pipe solar heat collecting element.Heat pipe 3 relies on gravity work.The slice capillary wick 4 of 2 to 30 millimeters of width is set in inside, heat pipe 3 hot junction, and slice capillary wick 4 usefulness elastic circlips 5 overlay in heat pipe 3 hot junction inwalls.Slice capillary wick 4 adopts glass fabric to make; Elastic circlip 5 is made for the phosphor-copper material.The length of slice capillary wick 4 is 20% of heat pipe 3 hot junction length; The lower end of slice capillary wick 4 is from 50 millimeters of the distances of heat pipe 3 bottoms.At heat collecting element label is set, during convenient the installation slice capillary wick 4 is placed bottom the heat collecting element.Side by side outside arrow is represented the cold junction position of heat pipe 3 among Fig. 1.

When the heat collecting element of Fig. 1 embodiment turns clockwise about 45 degree when tilting to install, heat pipe 3 can rely on gravity to realize the two phase flow cycle heat exchange, and solar thermal energy is passed to heating load by cold junction continuously.During heat pipe 3 work, because slice capillary wick 4 can not held working medium, so the working medium filling weight does not increase, heat pipe 3 inner saturated vapor pressures are in low-level when being conducive to limit empty the solarization.

When the heat collecting element of Fig. 1 embodiment turns clockwise about 45 degree when tilting to install, slice capillary wick 4 can be when heat pipe 3 not be worked a large amount of sticking liquid refrigerants, improve the position that former light pipe heat pipe is collected in the working medium of heat pipe 3 bottoms.When slice capillary wick 4 is conducive to heat pipe 3 and starts from 50 millimeters of heat pipe 3 bottom spacing distances from top and below absorb solar thermal energy simultaneously and accelerate startup.

Among Fig. 1 embodiment, so allow during heat pipe 3 operate as normal below it dry or dry slice capillary wicks 4 of part of tens of millimeters sections when heat pipe 3 work, usually not hold working medium.When the sun set, the evaporation of the condensate water of heat pipe 3 cold junction inner surfaces comprised that the whole or most working medium of all working medium of this part working medium are by slice capillary wick 4 stickings.

Claims

1. a slice capillary wick working medium high position is gathered all-glass vacuum heat collector tube element, comprise cover glass tube and inner glass tube, cover glass tube and inner glass tube nested, concentric are arranged sealing-in, inner glass tube from sealing-in place stretch out forward and inside vacuumize can working medium after sealed-off make a heat pipe, inner glass tube is that the outer surface of glass heat pipe contains absorbing film, it is characterized in that containing in inside, heat pipe hot junction the slice capillary wick of 2 to 30 millimeters of width, the slice capillary wick adopts elastic circlip to overlay in heat pipe hot junction inwall; The length of slice capillary wick is 10 to 50% of heat pipe hot junction length; The lower end of slice capillary wick is 0 to 200 millimeter from the distance of heat pipe bottom.

2. according to the described heat collecting element of claim 1, it is characterized in that 700 ± 50 watts/square metre of sunshine exposures, 40 ± 5 ℃ of the water temperatures in the 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: the slice capillary wick hold liquid refrigerant quality≤its maximum liquid refrigerant volume of holding 25%.

3. according to claim 1 or 2 described heat collecting elements, it is characterized in that: the maximum liquid refrigerant volume of holding of slice capillary wick 〉=4 milliliters; 40 ± 5 ℃ of the water temperatures in 700 ± 50 watts/square metre of sunshine exposures, the 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, the slice capillary wick is held quality≤0.9 milliliter of liquid refrigerant.