JPS58213657A - Sealed double glass tube - Google Patents

Abstract

PURPOSE:To seal a double glass tube with certainty without causing the damage of the glass tube, by sealing an annular space of the double glass tube with a sealing member having uneven engaging parts and annular packings on the inner and outer pripheries of the sealing member. CONSTITUTION:A sealed double glass tube consists of a transparent outer glass tube 1, a transparent inner glass tube 2 inserted in the interior thereof and a sealing member 4 provided therebetween. The sealing member 4 consists of two superposed plastic annular members 10 and 11, and the member 10 has a recessed part in the superposed surface. The annular member 11 has a protruded part engaging with the recessed part. Annular packings 12 and 13 consisting of an elastic plastic material are placed on the inner and outer peripheries of the above-mentioned recessed and protruded engaging parts. A stud bolt 14 is threaded into the annular member 11 to pass through the upper annular member 10. The above-mentioned annular members 10 and 11 are tightened by a nut 15 to fasten the outer and inner tubes 1 and 2.

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. It consists of an outer tube 1, 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, and one end of the outer tube 1 and the inner tube 2. An annular sealing member 4 is provided in between, and a light-absorbing and heat-radiating agent 6 that repeatedly absorbs light energy and releases thermal energy is passed through a liquid supply pipe 5 inserted through the sealing member 4. A solar energy collector unit is known that collects heat by circulating a heat medium inside the tube 3. The other end of the outer tube 1 is provided with an outflow hole 7 for the light-absorbing and heat-radiating agent 6, and the inside of the inner tube 2 is sealed to create a vacuum, thereby enhancing the insulation effect between the heat-absorbing tube 3 and the light-absorbing and heat-radiating agent 6. It's increasing.

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 since the inside of the inner tube 2 is kept in a vacuum, heat There is a problem that the glass tube is very easily damaged near the seal member 4 due to the equal pressure difference in expansion, and sealing is not easy.

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 annular members made of plastic that are 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 and outer circumferential edges of the uneven fitting portion are fastened to the double annular member, and the elastic annular packings on the periphery 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.

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 seal member, a material having acid resistance, alkali resistance, solvent resistance, etc., such as a fluororesin such as polytetrafluoroethylene or polytrifluorochloroethylene, is suitable.

It is also an annular gasket when it is squeezed between the annular members.

Any material may be used as long as it can be press-fitted to the glass tube wall to provide a sealing effect, but it is preferable to use a material that is more flexible and elastic than the annular plastic member. As such a resin, the same fluororesin, silicone resin, synthetic rubber, etc. as mentioned above are suitable. The fastener used in the present invention may be anything that can press the annular members together, such as a bolt and a nut.

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

FIG. 2 is a cross-sectional view of a sealed portion showing one embodiment of the sealed double glass tube of the present invention, and FIG. 3 is a plan view of the glass tube structure as seen from the entrance direction. consists of an outer tube 1 made of transparent glass, 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, The sealing member 4 is composed of two plastic annular members 10 and 11 stacked one on top of the other, of which the overlapping surfaces of member 10 form a recess, and member 11 fits into the recess. It forms a convex part like this. 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, a stud bolt 14 is erected on the annular member 11, passes through the annular member 10 above the annular member 11, and is adapted to tighten and tighten the annular members 10 and 11 with a nut 15. By tightening the annular seal members 10 and 11 through the elastic annular packing 12 as described above, the elastic annular packings 12 and 13 are pressed against the outer wall of the inner wall 2 and the inner wall of the outer wall 1, respectively, and the gap between the inner pipe and the outer pipe is Upon sealing, the sealing member is fixed. Incidentally, a supply pipe 5 is provided through the annular seal member 4 to allow the light-absorbing and heat-radiating material to flow therethrough.

In the above embodiment, the stud 14 and nut 1
Although the fasteners consisting of 5 are provided at four locations, the number is not particularly limited in the present invention, and the light absorbing and heat dissipating agent supply pipe is provided at only one location, but this is provided at two locations. One side may also be used as an air vent hole.

In the above embodiment, when the peripheral corner portions of the sealing annular members 10' and 11 are formed into a tapered shape, the sealing annular members 12' and 11' are formed in a tapered shape.
The area in which the glass tube 13 is pressed against the wall of the glass tube increases, and the sealing effect can be further enhanced.

In order to use the above-mentioned double-glazed glass tube as a solar energy collector, as shown in FIG. The isomerization reaction can be caused by using sunlight to irradiate the cough absorbing and heat dissipating agent, but in this case, in order to increase the reaction rate, an appropriate partition should be provided between the inner tube and the outer tube.
For example, it can be a spiral flow path. In addition, when the heat exchange pipe 3 in the inner tube 2 is made of metal, it is preferable that the joint portion 3A is formed of a material that has adhesive properties to both glass and metal, such as a cobalt alloy.

The above examples are examples in which the present invention is applied to a solar energy collector, but the present invention is not limited thereto.
It can be similarly applied to other cases where it is necessary to seal the annular part of a double glass tube.

As described above, according to the present invention, the annular space of the double glass tube is
By using a sealing member having an uneven fitting portion and annular packings on the inner and outer edges, it is possible to safely and reliably seal the glass tube without damaging it.

[Brief explanation of the drawing]

FIG. 1 is a side view of a solar energy collector unit using a sealed double glass tube, and FIG. 2 is a side sectional view showing the sealing part of the sealed double glass tube of the present invention. DESCRIPTION OF SYMBOLS 1...Outer tube, 2...Inner tube, 4...Sealing member, 5...Light absorbing and heat dissipating agent supply pipe, 1゛2.13.
... Annular packing, 14 ... Studded bolt,
15...Natsuto. Agent: Patent Attorney Takeshi Kawakita Long Procedural Amendment (formality) July 5, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case: 1981 Patent Application No. 94000 2, Title of the invention: Sealed Double glass tube 3, relationship to the amended person case Patent applicant address: 2-7-8 Kamikizaki, Urawa City, Saitama Name: Yomura Rikagaku Kenkyusho Foundation Representative Sadayasu Asano 4; Agent: 103 Address: 11-8 Nihonbashi Kayabacho, Chuo-ku, Tokyo (
(Date of dispatch: September 28, 1982) 6. Number of inventions increased by amendment 0 (1) Changed "Front view" in the second line of page 8 of the specification to "Front view, and Figure 3 is its plan view." Changed to Above (2) 288-

Claims (1)

[Claims] (1) In 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 The sealing member includes at least double annular members made of plastic that are 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 and outer circumferential edges of the uneven fitting portion are fastened to the double annular member, and the elastic annular packings on the periphery are attached to the inner wall of the outer tube and the outer wall of the inner tube, respectively. A sealed double glass tube characterized in that it has a fastener that presses against the tube to seal it. (Powder In claim 1 of the patent, the outer tube and the inner tube are made of transparent glass, and the sealing member is provided with a liquid supply tube for circulating a light-absorbing and heat-radiating agent between the inner tube and the outer tube. A sealed double glass tube for collecting solar energy, characterized by the following: