JPH023091Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solar heat collection tube that heats a heat medium using solar heat.

B. Prior Art In general, a solar heat collection tube consists of a heat medium pipe 20 through which a heat medium flows, and a heat medium pipe 2, as shown in FIG.
A flat heat collecting plate 21 thermally connected to the
It has a structure in which a holding device is provided inside a transparent outer tube 22 made of glass via a support plate 21a and a bracket 21b, and the inside of this outer tube 22 is kept at a high vacuum, and the inner tube The installed heat collecting plate 21 and outer tube 22
Vacuum insulation is provided between the When solar heat is collected by the heat collecting plate 21 housed in the outer tube 22 and heating the heat medium flowing in the heat medium tube 20 connected to the heat collecting plate 21, the heat collecting plate 21 is heated by the vacuum insulation.
This prevents convection and conduction of heat from the inside to the outside air, improving heat collection efficiency.

By the way, in the solar heat collector tube of the above type, the degree of vacuum inside the outer tube 22 is usually kept at a high vacuum of 10 ^-4 Torr or more, and when the degree of vacuum becomes less than 10 ^-4 Torr, the performance of the solar heat collector tube deteriorates. To achieve this, various considerations have been made to the manufacturing process, materials, and materials.

However, as mentioned above, even in solar heat collector tubes obtained by considering the manufacturing process, materials, and materials, a small amount of gas is released from the component parts over time, so the degree of vacuum decreases and the performance deteriorates. I had a lot of flaws. Therefore, in order to adsorb this released gas, a getter 23 is conventionally installed inside the solar heat collection tube as shown in FIG. 8. The getter 23 has a getter material 24 such as barium stored in an annular groove 23a provided on the outer periphery and having one side open. Then, this getter material 24 is heated from the outside of the solar heat collecting tube using a high-frequency heater (not shown), and the getter material 24 is heated and evaporated to form a metal film surface on the inner circumferential surface of the outer tube 22, and is released at this time. This prevents the degree of vacuum from decreasing due to the gas by adsorbing the gas onto the metal film surface.

By the way, a metal stay 25 has conventionally been used to support the getter 23 in the outer tube 22, and one end of this stay 25 is welded and fixed to the surface of the heat collecting plate 21, for example, and the other end is fixed to the surface of the heat collecting plate 21 by welding. By fixing the getter 23 by welding or the like, the getter 23
is held in place within the solar collector tube.

However, when the getter 23 is supported by the above method, it becomes necessary to fix the stay 25 to the heat collecting plate 21, for example, by welding, and during this welding operation,
There is a drawback that it is necessary to accurately position the heat collecting plate 21 at a predetermined position in the longitudinal direction and at a predetermined position in the circumferential direction, which is time-consuming.

(b) Purpose of the invention When fixing a stay for supporting a getter at a predetermined position within a solar heat collecting pipe, the stay can be easily and reliably fixed without welding or the like.

C. Structure of the device A flat heat collecting plate is joined to a heat medium pipe disposed inside a translucent outer tube, and a getter is supported below the heat collecting plate via a stay. The stay is formed of a strip-like spring material having a locking part bent into an elastic shape at one end and a support part for supporting the getter at the other end. , and a cut-and-raised portion is formed at a predetermined position of the heat collecting plate, and the locking portion of the stay is pressed into contact with the cut-and-raised portion, and the locking portion of the stay is engaged with the cut-and-raised portion provided on the heat collecting plate. By inserting it, the stay is positioned and fixed on the heat collecting plate.

D. Embodiment FIG. 1 is a drawing showing a solar heat collection tube equipped with a stay according to the present invention. This solar heat collecting tube is similar to the conventional one, with heat medium pipe 1 through which the heat medium flows.
and the flat heat collecting plate 2 thermally connected to the heat medium pipe 1 are connected to the support plate 2a and the bracket 2.
It has a structure in which the heat collecting plate 2 is held in a transparent outer tube 3 made of glass through the heat collecting plate 2.
As shown in Fig. 2, the cut and raised portion 4 has a U-shaped cross section.
is provided. FIG. 3 is a drawing showing a stay for supporting the getter 5 in the solar heat collection tube described above. This stay is made by bending a band-like spring material into a substantially L-shape, and has a support portion R to which the getter 5 is fixed at one end, and a collector at the other end. A locking portion C is provided with which a cut-and-raised portion 4 provided on the hot plate 2 engages. This locking portion C is made elastic by being bent into an F-shape. Further, a protrusion D for positioning that contacts the side edge 4a of the cut-and-raised part 4 is provided at the root of the locking part C, and a guide part E is provided at the tip. .

In the above configuration, in order to support the getter 5 at a predetermined position in the solar heat collecting pipe using the stay according to the present invention, as shown in FIG. While elastically deforming C, press fit into the cut and raised portion 4 provided on the surface of the heat collecting plate 2, press the locking portion C into contact with the cut and raised portion 4, and press the convex portion D provided on the locking portion C. Side edge portion 4 of cut and raised portion 4
By bringing the stay into contact with the heat collecting plate 2
Position and fix above. Then, the getter 5, which has been welded and fixed to the stay in advance, is supported at a predetermined position within the solar heat collecting pipe.

5A and 5B are drawings showing a second embodiment of the stay according to the present invention.
A wide portion for positioning that comes into contact with a is provided, and the other configuration is the same as that shown in FIG. 3.

FIG. 6 is a drawing showing a third embodiment of the stay according to the present invention, and as shown in this figure, the stay has a locking portion C that engages with a cut-and-raised portion 4 provided on the heat collecting plate 2. The shape is approximately V-shaped, and a guide portion E is formed on the lower surface side, and a folded portion T for positioning that contacts the side edge 4a of the cut and raised portion 4 is provided at the tip end.

To attach the stay having the above shape to the heat collecting plate 4, as described above, the stay is press-fitted into the cut-and-raised part 4 provided on the surface of the heat collecting plate 2 while elastically deforming the locking part C of the stay. Press the locking part C against the cut and raised part 4,
In addition, the stay can be positioned and fixed on the heat collecting plate 2 by bringing the folded portion T provided on the locking portion C into contact with the side edge 4a of the cut and raised portion 4.

E. Effect of the invention As explained above, the stay for supporting the getter in the solar heat collecting pipe has a locking part bent into an elastic shape at one end and supports the getter at the other end. The stay is made of a strip-shaped spring material having a supporting part for the purpose of the stay, and the retaining part of the stay is elastically pressed against the cut-and-raised part provided on the heat collecting plate of the solar heat collecting tube. Positioning and fixing on the heat collecting plate eliminates the need for welding to attach the stay to the solar heat collecting pipe, making it easier to attach the stay to the solar heat collecting pipe. In addition, the stays can be easily formed by bending a strip-shaped spring material, and the cut and raised portions formed on the heat collecting plate can also be easily formed by press working, so the stays and cut and raised portions can be easily formed by pressing. It is also easy to manufacture the part.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the solar heat collecting tube according to the present invention.
Figure 2 is a perspective view of the cut-and-raised part provided on the heat collecting plate, Figure 3
Figure A is a front view of the stay according to the present invention, and Figure 3B is a side view. FIG. 4 is a drawing showing the stay engaged with the cut and raised portion, FIG. 5A is a front view showing a second embodiment of the stay according to the present invention, FIG. 5B is a side view, and FIG. FIG. 6A is a front view showing a third embodiment of the stay according to the present invention, and FIG. 6B is a side view.
FIGS. 7 and 8 are cross-sectional views showing conventional examples of solar heat collecting tubes. 1... heat medium tube, 2... heat collecting plate, 3... outer tube,
4... cut and raised part, 5... getter, a... stay, b... support part, c... locking part.

Claims (1)

[Scope of utility model registration request] A flat heat collecting plate is joined to a heat medium pipe disposed inside a translucent outer pipe, and a getter is supported below the heat collecting plate via a stay. is formed of a band-shaped spring material having a locking part bent into an elastic shape at one end and a support part for supporting the getter at the other end, and 1. A solar heat collecting tube characterized in that a cut-and-raised portion is formed at a predetermined position of the heat collecting plate to which a locking portion of the stay is pressed.