CN201497234U

CN201497234U - Anti-burst solar heat collecting tube

Info

Publication number: CN201497234U
Application number: CN200920234782XU
Authority: CN
Inventors: 敖凯平
Original assignee: AO Smith China Water Heater Co Ltd
Current assignee: AO Smith China Water Heater Co Ltd
Priority date: 2009-07-31
Filing date: 2009-07-31
Publication date: 2010-06-02
Anticipated expiration: 2019-07-31

Abstract

The utility model relates to an anti-burst solar heat collecting tube, belonging to the technical field of water heaters. The heat collecting tube comprises a glass sandwich vacuum tube and a glass heat-exchange inner tube, wherein one end of the glass sandwich vacuum tube is provided with an opening, the glass heat-exchange inner tube is inserted at the opening at one end of the vacuum tube, the closed end of the glass inner tube approaches the closed end of the vacuum tube, the two closed ends are positioned via an elastic retainer, the opening end of the glass inner tube approaches the opening of the vacuum pipe, the two openings are positioned in an isolating form via an elastic retainer, and the inside of the glass inner tube is communicated with a water heater heat-exchange medium header via the opening end thereof. During usage, the sunny side and the night side of the glass inner tube can generate temperature difference after absorbing heat of sunshine, and the heat exchange medium in the glass inner tube can form natural convective circulation with the water heater heat-exchange medium header due to thermosiphonic effect, thereby realizing needed heat exchange. The vacuum tube can not be stressed and can not load heat deformation stress of the inner tube, and then 'pipe bursting' can be avoided effectively. The anti-burst heat collecting tube is simple in structure and economical in cost.

Description

Anti-burst solar heat collecting tube

Technical field

The utility model relates to the thermal-collecting tube of a kind of application and solar water heater, and especially a kind of anti-burst solar heat collecting tube belongs to technical field of water heaters.

Background technology

Being installed in solar water heater storage water tank common on the building at present is non-pressure-bearing type, does not therefore have bearing requirements for thermal-collecting tube.Along with the appearance of pressure-bearing type solar water heater, to the corresponding bearing requirements that proposed of thermal-collecting tube.The main body of existing solar energy heat collection pipe is a vacuum tube, and vacuum tube itself can't pressure-bearing, and therefore existing vacuum tube type solar energy water heater solves the pressure-bearing problem and adopted following several measure respectively:

1) heat pipe of increase phase-change heat-exchange medium in vacuum tube, heat pipe is positioned at vacuum tube for one section, can be provided with the aluminium fin between heat pipe and the vacuum tube, realizes system's storage tank pressure-bearing and heat collector vacuum tube pressure-bearing by three heat exchange.Its drawback is decay easily decrease in efficiency and a cost height of heat pipe.

2) in vacuum tube, settle U type copper pipe, can be provided with the aluminium fin between copper pipe and the vacuum tube, in press-bearing water tank, also be provided with the heat exchanger that coil pipe or little courage constitute, realize system's storage tank pressure-bearing and heat collector vacuum tube pressure-bearing not by three heat exchange.Its drawback is that the resistance of copper pipe pipe is big, and circulating effect is bad, generally wants the configuration cycles pump, and cost is very high, and the easy corrosion leakage of metal tube.

Retrieval is found, the Chinese patent application that application number is 200420005284.5, name is called " a kind of solar energy heat collection pipe " discloses a kind of solar energy heat collection pipe, it is a lower end closed and the metal tube that is provided with thermofin, in metal tube, insert a partition bar it is divided into the back, two runners of sunny side, its structure is comparatively simple, but heat exchange essence and U type copper pipe are roughly the same, therefore also have similar drawback.

The utility model content

The purpose of this utility model is: at the drawback that above-mentioned prior art exists, propose with a kind of can be under inner artesian condition long-term stable operation, and anti-burst solar heat collecting tube simple in structure, cost economy.

In order to achieve the above object, the applicant studies existing similar technology, draws to draw a conclusion:

1), because vacuum tube can't pressure-bearing, outside the pipe, be not communicated with in therefore it can only being enclosed within the bearing water tank of water heater;

2), interior pipe is communicated with the water heater bearing water tank, should pressure-bearing;

3), owing to will realize and the storage tank heat exchange of water heater that the heat transferring medium (water) in the therefore interior pipe should be able to circulate.

Under the situation that does not dispose pump, be to form the ingenious method that water circulates by thermal siphon.The U-shaped pipe of above-mentioned prior art and in metal tube, insert a partition bar it is divided into two runners, all be to utilize that water temperature in the sunny side runner is higher, density is less, and the rule that the water temperature in the back runner is lower, density is bigger, water in the sunny side runner is risen in the storage tank of water heater naturally, and the bottom-up runner sunny side of the water in back runner runner, water in the water heater storage tank adds to back runner again, formation is based on the free convection circulation of thermosiphon principle, thus the heat exchange of interior pipe of realization and water heater storage tank.

In the long-term work practice, the applicant finds through constantly groping: in an interior pipe, water temperature has tangible lamination, and hot water is being descended at last, cold water.Therefore, if guide properly, even manage the convection circulation that also can produce in one based on thermal siphon.On this found basis, the applicant had proposed anti-burst solar heat collecting tube of the present utility model: comprise the glass sandwich vacuum tube of an end opening and be inserted in the heat-exchange glass in the vacuum tube by opening part and manage; At the bottom of the pipe of the contiguous vacuum tube of the blind end of described glass inner tube, each other by elastomeric isolation delineation position; The opening part of the contiguous vacuum tube of the openend of described glass inner tube is isolated the location by the elastomeric isolation ring each other; Be communicated with water-heater heat-exchanging medium storage tank by its openend in the described glass inner tube.

Of the present utility model further improving is that described elastomeric isolation ring is shaped on the steam vent of sealing under the normal pressure.

It is that described glass inner tube is equipped with metal fin outward that the utility model further improves.

Because when anti-burst solar heat collecting tube of the present utility model uses, absorb too can the heat energy of light after, the sunny side of glass inner tube self and the back can produce the temperature difference, therefore as long as its port of export is higher than blind end, heat transferring medium wherein will form the free convection circulation with water-heater heat-exchanging medium storage tank because of thermosyphon effect, thereby realizes required heat exchange.Vacuum tube is pressure-bearing not only, and and interior pipe between be separated with elastic ring, therefore the thermal deformation stress of pipe in can not bearing can effectively avoid " bombing " phenomenon.Obviously, it is simple in structure, cost economy.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the structural representation of the utility model embodiment one.

Fig. 2 is the practical application structural representation of Fig. 1 embodiment.

Fig. 3 is the structural representation of the utility model embodiment two.

The specific embodiment

Embodiment one

The anti-burst solar heat collecting tube of present embodiment comprises the glass sandwich vacuum tube 6 of an end opening and is inserted in the heat-exchange glass in the vacuum tube 6 by opening part and manage 4 as shown in Figure 1.The blind end of glass inner tube 4 is the hemisphere head, the bottom of the contiguous vacuum tube 6 of this hemispherical head blind end, elastomeric isolation circle 8 location of making by silicon rubber each other.One end shape of these elastomeric isolation circle 8 contiguous vacuum tube bottoms matches with pipe end cavity shape, and it is recessed that an end of pipe 4 has the hemisphere that matches with the blind end shape in the adjacent glass.The opening part of the contiguous vacuum tube 6 of the openend of glass inner tube 4 is isolated the location by the elastomeric isolation ring 9 that silicon rubber is made each other.This elastomeric isolation ring 9 has the endoporus with glass inner tube 4 close-fittings, can also have the annular groove that is stuck in vacuum tube opening part edge in case of necessity, thereby be buckled between the two steadily.In addition, this elastomeric isolation ring 9 also is shaped on the steam vent 10 of sealing under the normal pressure.This hole is sealed under the normal pressure situation, when cold and hot the collapsing of air layer between vacuum tube 6 and the glass inner tube 4, plays the ventilation effect, keeps the air between vacuum tube 6 and the glass inner tube 4 to be in atmospheric pressure state substantially, thereby guarantees not pressure-bearing, unstressed of vacuum tube 6.

One of application example of present embodiment as shown in Figure 2, one group of parallel respectively being supported in header 5 and the tail holder 7 in anti-burst solar heat collecting tube two ends that constitutes by vacuum tube 6 and glass inner tube 4, each anti-burst solar heat collecting tube slight inclination, the port of export is higher than blind end.Pass through its openend with water-heater heat-exchanging medium storage tank---header 4 is communicated with in the glass inner tube 4 of each anti-burst solar heat collecting tube.During work, glass-vacuum tube 6 absorbs behind the solar energies by air layer heat to be passed to manages 4 in the heat-exchange glass, thus heating water wherein.Because the sunny side of glass inner tube 4 is heated different with the back, can produce the temperature difference, therefore the water in the pipe can form the free convection circulation with header 5 because of thermosyphon effect, form the free convections circulation by the interior hot-water cavity 2 of two circulation pipes on the header 53 and water heater again, finish heat exchange, thus the water in the heating water heater storage tank 1.In this system, vacuum tube 6 is pressure-bearing not only, and and interior pipe 4 between be separated with elastic ring, therefore the thermal deformation stress of pipe 4 in can not bearing can effectively avoid " bombing " phenomenon.

When conventional solar energy glass vacuum pipe sky shines, maximum temperature can be above 280 ℃, inject if any cold water this moment, because the special construction of glass-vacuum tube, internal stress is difficult to eliminate, be easy to cause " bombing " phenomenon to take place, and do not leak water in the glass-vacuum tube 6 in the present embodiment, but in heat-exchange glass, leak water in the pipe 4, and the hollow pipe that this glass inner tube 4 only is a simple structure, do not have internal stress during manufacturing fully, thereby can fundamentally stop the bombing that thermal shock causes.

Embodiment two

The anti-burst solar heat collecting tube of present embodiment as shown in Figure 3, its basic structure and the mechanism of action are identical with embodiment one.Difference is, the glass inner tube 4 outer aluminium fins 11 that are equipped with.The internal diameter of the external diameter of aluminium fin 11 and vacuum tube 6 matches, and so not only can more effective solar heat that vacuum tube is absorbed be delivered to interior pipe, and glass inner tube and vacuum tube are supported each other, and integral body is more firm.Aluminium fin 11 promptly can be spirally wrapped around outside the glass inner tube 4, also can be the ring-type of fixed interval outside glass inner tube 4.

In a word, above embodiment is by the temperature difference of glass inner tube self sunny side and back generation, the ingenious thermal siphon that has realized in the simple structure glass inner tube, thereby guaranteed required heat exchange effect with rational structure, and thoroughly solved the industry difficult problem that solar water heater glass-vacuum tube thermal shock causes bombing, it is with low cost, and is easy to utilize.

In addition to the implementation, the utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.

Claims

1. anti-burst solar heat collecting tube comprises the glass sandwich vacuum tube of an end opening; It is characterized in that: pipe in the opening part plug-in mounting heat-exchange glass of described glass sandwich vacuum tube; At the bottom of the pipe of the contiguous vacuum tube of the blind end of described glass inner tube, each other by elastomeric isolation delineation position; The opening part of the contiguous vacuum tube of the openend of described glass inner tube is isolated the location by the elastomeric isolation ring each other; Be communicated with water-heater heat-exchanging medium storage tank by its openend in the described glass inner tube.

2. anti-burst solar heat collecting tube according to claim 1 is characterized in that: described elastomeric isolation ring is shaped on the steam vent of sealing under the normal pressure.

3. anti-burst solar heat collecting tube according to claim 2 is characterized in that: described glass inner tube is equipped with metal fin outward.

4. anti-burst solar heat collecting tube according to claim 3 is characterized in that: the external diameter of described metal fin and the internal diameter of described vacuum tube match.

5. anti-burst solar heat collecting tube according to claim 4 is characterized in that: described metal fin is spirally wrapped around outside the glass inner tube.

6. anti-burst solar heat collecting tube according to claim 4 is characterized in that: described metal fin is the ring-type of fixed interval outside glass inner tube.

7. according to claim 5 or 6 described anti-burst solar heat collecting tubes, it is characterized in that: the blind end of described glass inner tube is the hemisphere head.

8. anti-burst solar heat collecting tube according to claim 7 is characterized in that: an end shape of the contiguous vacuum tube of described elastomeric isolation circle bottom matches with pipe end cavity shape, and it is recessed that an end of pipe has the hemisphere that matches with the blind end shape in the adjacent glass.

9. anti-burst solar heat collecting tube according to claim 8 is characterized in that: described elastomeric isolation ring has and the endoporus of glass inner tube close-fitting and the annular groove that is stuck in vacuum tube opening part edge.