JPH0428980B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed double glass tube, and more particularly to a sealed double glass tube suitably used as a member of a solar energy collector.

Conventionally, solar energy collectors are composed of an outer tube 1 made of transparent glass, an inner tube 2 made of transparent glass arranged concentrically inside the outer tube 1, and an endothermic tube 3 arranged inside the outer tube 1. 1 and one end of the inner tube 2, an annular sealing member 4 is provided between the sealing member 4 and one end of the inner tube 2, and a light-absorbing and heat-radiating agent is capable of repeatedly absorbing light energy and releasing heat energy from a liquid supply tube 5 inserted through the sealing member 4. A solar energy collector unit is known in which heat is recovered by circulating a heat medium through the heat absorption tube 3 and through the heat absorption tube 3. Above outer tube 1
The other end is provided with an outflow hole 7 for the light-absorbing and heat-radiating agent 6,
In addition, the inside of the inner tube 2 is sealed to create a vacuum.
The heat-insulating effect between the heat-absorbing tube 3 and the light-absorbing heat-radiating agent 6 is enhanced. As the sealing member 4, an annular member made of a plastic material such as fluororesin is used.

In the double glass tube structure as described above, the temperature of the glass tube body rises due to absorption of sunlight, creating a temperature difference between the inner and outer surfaces, and the inside of the inner tube 2 is kept in a vacuum. There is a problem that the glass tube is very easily damaged near the sealing member 4 due to differences in thermal expansion, etc., and sealing is not easy.

In addition, as another structure of the seal part of the double pipe,
As described in Japanese Utility Model Application Publication No. 56-106278, a structure is known in which an annular seal body with a substantially rectangular cross section is tightened with bolts and nuts. There is a problem similar to that of the prior art described above in terms of overfilling.

An object of the present invention is to provide a sealed double glass tube that ensures a reliable seal between the outer tube and the inner tube of the solar energy collector, etc., and is not damaged by thermal expansion or the like.

The present invention provides a sealed double glass tube having an outer tube made of glass, an inner tube made of glass inserted into the inner tube, and a sealing member provided between the outer tube and the inner tube. The sealing member includes at least double plastic annular members loosely fitted between the outer tube and the inner tube, and a concave-convex fitting portion formed at the overlapping portion of the double annular members; The elastic annular packings disposed on the inner circumferential edge and the outer circumferential edge of the uneven fitting portion, respectively, and the double annular member are tightened, and the elastic annular packings on the circumferential edge are attached to the inner wall of the outer tube and the outer wall of the inner tube, respectively. It is characterized by having a fastener that presses against and seals.

The present invention focuses on effectively utilizing two thin O-ring-shaped seal bodies (hereinafter referred to as annular packings), and clamps the annular packings to exert desired elastic deformation and sealing effects. It provides a seal structure. That is, the seal structure of the double glass tube in the present invention consists of two annular gaskets and at least double plastic members that are permanent members that do not require elastic deformation to sandwich them. It mainly consists of

In the present invention, hard glass with a small coefficient of thermal expansion is suitable for forming the outer tube and the inner tube. Further, as the annular plastic member used as the sealing member, one having acid resistance, alkali resistance, solvent resistance, etc., such as fluororesin such as polytetrafluoroethylene and polytrifluorochloroethylene, is suitable. In addition, the annular packing may be one that presses against the glass tube wall and provides a sealing effect when crushed between the annular members, but it may be made of a material that is softer and more elastic than the annular plastic member. Preferably. Suitable examples of such resin include the same fluorine-based resins, silicone-based resins, and synthetic rubbers as mentioned above.
The fastener used in the present invention may be any fastening tool as long as it can overlap and press the annular members,
For example, it could be something like Boruto and Natsu.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a sectional view of a sealed portion showing an embodiment of the sealed double glass tube of the present invention, and FIG.
It is a top view seen from the direction. In the figure, this glass tube structure includes an outer tube 1 made of transparent glass, and an inner tube 2 similarly made of transparent glass inserted into the outer tube 1.
and a sealing member 4 provided between the outer tube 1 and the inner tube 2, and the sealing member 4 consists of two plastic annular members 10 and 11 stacked one on top of the other. The overlapping surfaces of the member 10 form a recess, and the member 11 forms a convex portion that fits into the recess. Annular packings 12 and 13 made of an elastic plastic material are arranged on the inner and outer peripheral edges of the uneven fitting portion, respectively. Furthermore, the annular member 11
A stud bolt 14 is erected at , passes through the annular member 10 at the upper part thereof, and is adapted to tighten and tighten the annular members 10 and 11 with a nut 15 . As mentioned above, the elastic annular packing 12
and 13 via annular seal members 10 and 1
By tightening the elastic annular packing 12
and 13 are the outer wall of the inner tube 2 and the outer wall 1, respectively.
The sealing member is pressed against the inner wall of the tube, sealing the space between the inner tube and the outer tube, and fixing the sealing member. Note that a supply pipe 5 for distributing the light-absorbing and heat-radiating agent is provided through the annular seal member 4 .

In the above embodiment, four fasteners each consisting of a stud bolt 14 and a nut 15 are provided, but the number is not particularly limited in the present invention. Furthermore, although the supply pipe 5 for the light-absorbing and heat-radiating agent is provided at only one location, it may be provided at two locations and one may also serve as an air vent hole.

In the above embodiment, the sealing annular member 10,
When the peripheral corner portions of the seals 11 are formed into a tapered shape, the area where the seals 12 and 13 are pressed against the glass tube wall increases, and the sealing effect can be further enhanced.

In order to use the above double glass tube as a solar energy collector, as shown in FIG.
A light-absorbing and heat-radiating agent (for example, norbornadiene solution) is passed between the inner tube 2 and the inner tube 2, and sunlight is irradiated onto the light-absorbing and heat-radiating agent using a reflecting mirror to cause an isomerization reaction. In order to increase the efficiency, suitable partitions can be provided between the inner and outer tubes, for example spiral flow channels. In addition,
When the heat exchange pipe 3 in the inner tube 2 is made of metal, the joint portion 3A is preferably formed of a material that has adhesive properties to both glass and metal, such as a cobalt alloy.

The above is an example in which the present invention is applied to a solar energy collector, but the present invention is not limited thereto, and can be similarly applied to other cases where it is necessary to seal the annular portion of a double glass tube. can do.

As described above, according to the present invention, the annular space of the double glass tube is safely and reliably sealed without causing damage to the glass tube by using the sealing member having the uneven fitting portion and the annular packing on the inner and outer edges. can do.

[Brief explanation of drawings]

Figure 1 is a side view of a solar energy collector unit using sealed double glass tubes; Figure 2 is a side view of a solar energy collector unit using sealed double glass tubes;
FIG. 3 is a side cross-sectional view showing the sealed portion of the sealed double glass tube of the present invention, and FIG. 3 is a plan view thereof. 1... Outer tube, 2... Inner tube, 4... Seal member,
5...Light absorbing and heat dissipating agent supply pipe, 12, 13... Annular packing, 14... Studded bolt, 15... Nut.

Claims (1)

[Claims] 1. A sealed double-glazed glass comprising an outer glass tube, an inner glass tube inserted into the outer tube, and a sealing member provided between the outer tube and the inner tube. In the tube, the sealing member includes at least double annular members made of inelastic plastic that are loosely fitted between the outer tube and the inner tube, and unevenness formed at the overlapping portion of the double annular members. The double annular member is fastened to the shaped fitting portion, and elastic annular packings disposed on the inner and outer edges of the uneven fitting portion, respectively, and the elastic annular packings on the periphery are tightened. 1. A sealed double glass tube comprising a fastener that presses against an inner wall of the tube and an outer wall of the inner tube for sealing. 2. In claim 1, the outer tube and the inner tube are made of transparent glass, and the sealing member is provided with a liquid supply tube for flowing a light-absorbing and heat-radiating agent between the inner tube and the outer tube. A sealed double glass tube for solar energy collection characterized by: