JPH0447563Y2 - - 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 it is held in a translucent outer tube 22 made of glass via a support plate 21a and a bracket 21b.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 collecting tube of the above type, the degree of vacuum inside the outer tube 22 is normally maintained 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 collecting 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, resulting in a decrease in the degree of vacuum and a decrease in performance. Then there was a drawback. Conventionally, a getter 23 is disposed inside the solar heat collection tube as shown in FIG. 6 in order to adsorb this emitted gas. 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 outside the solar heat collection tube using a high frequency heater (not shown), and the getter material 24 is
is heated and evaporated to form a metal film on the inner circumferential surface of the outer tube 22, and the released gas is adsorbed on the metal film surface to prevent the degree of vacuum from decreasing due to the gas.

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 getter 23 is fixed to the other end. By fixing the getter 23 by welding or the like, the getter 23 is held at a predetermined position within the solar heat collecting pipe.

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,
This method requires a welding engineer and welding equipment, and it is also necessary to accurately position the heat collecting plate 21 in the longitudinal direction and circumferential direction, which is disadvantageous in that it 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 fixed simply and reliably without welding.

C. Structure of the invention In a solar heat collecting tube in which a flat heat collecting plate is joined to a heat medium pipe arranged in a translucent outer pipe, and a getter is supported on the heat collecting plate via a stay, The stay has a support part for supporting the getter at one end, an engaging part at the other end, and a rivet hole provided near the engaging part.
constituted by a letter-shaped band-shaped plate, and provided at a predetermined position of the heat collecting plate with an engagement hole that engages with the engagement portion of the stay and a through hole that matches the rivet hole of the stay, The stay is riveted to the heat collecting plate shape with the engaging portion of the stay engaged with the engaging hole of the heat collecting plate.

D. Embodiment FIG. 1 is a drawing showing a solar heat collecting tube in which a getter 1 is supported by a stay according to the present invention. This solar heat collecting tube, like the conventional one, consists of a heat medium pipe 2 through which a heat medium flows, a flat heat collecting plate 3 thermally connected to the heat medium pipe 2, and a support plate 2a and a bracket 2b. Glass transparent outer tube 4
It has a structure in which a retaining device is installed inside the heat collecting plate 3.
As shown in FIG. 2, the surface of the stay is provided with an engaging hole 3a for positioning and rotation prevention that engages with an engaging portion C provided on the stay, and a through hole 3b that matches a rivet hole D provided on the stay. . FIG. 3 is a diagram showing the stay for supporting the getter 1. As shown in FIG. This stay is made by bending a band-shaped plate into a substantially L-shape, and has a support portion RO on one end to which the getter 1 is fixed, and a heat collecting portion as described above on the other end. An engaging part C for positioning and rotation prevention that engages with the engaging hole 3a provided in the plate 3 is provided, and furthermore, an engaging part C for positioning and rotation prevention is provided which matches the through hole 3b provided in the heat collecting plate 3. There are rivet holes for this purpose.

In the above configuration, in order to support the getter 1 at a predetermined position in the solar heat collecting tube using the stay according to the present invention, as shown in FIG. Heat collector plate 3
Position the stay with the getter 1 with respect to the heat collecting plate 3 by engaging the stay with the engagement hole 3a provided in the stay, and aligning the rivet hole 2 provided in the stay with the through hole 3b provided in the heat collecting plate 3. I do. Next, the rivet 5 is inserted into the rivet hole 2 and the through hole 3b, the rivet 5 is tightened, and the stay is fixed on the heat collecting plate 3, thereby supporting the getter 1 at a predetermined position inside the solar heat collecting pipe. do.

E. Effects of the invention According to the invention, the stay supporting the getter can be easily and securely attached to the heat collecting plate by crimping rivets without welding, eliminating the need for welding engineers and welding equipment. This makes the installation work easier.

In addition, when riveting the stay onto the heat collection plate, the engagement part of the stay is engaged with the engagement hole of the heat collection plate, so only one rivet is needed to prevent the stay from rotating and position it. be able to.

Furthermore, the stay can be easily formed by bending a band-shaped plate into a substantially L-shape, and the engagement holes and through holes in the heat collecting plate can also be easily formed by punching.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the solar heat collecting tube according to the present invention.
FIG. 2 is a perspective view of the engagement hole and through hole provided in the heat collecting plate, FIG. 3A is a front view of the stay according to the present invention, and FIG. 3B is a side sectional view. Figure 4 is a sectional view showing the state in which the stay is riveted to the heat collecting plate, Figure 5
FIG. 6 is a sectional view showing a conventional example of a solar heat collecting tube. 1... Getter, 2... Heat medium tube, 3... Heat collecting plate, 3a... Engagement hole, 3b... Through hole, 4... Outer tube, 5... Rivet, A... Stay, Lo... ...Supporting part, C...Engagement part, D...Rivet hole.

Claims (1)

[Claims for Utility Model Registration] A solar heat collecting tube in which a flat heat collecting plate is joined to a heat medium pipe arranged inside a translucent outer pipe, and a getter is supported on the heat collecting plate via a stay. In this, the stay has a support part for supporting the getter at one end, an engagement part at the other end, and a rivet hole provided in the vicinity of the engagement part. constituted by a letter-shaped band plate, and provided at a predetermined position of the heat collecting plate with an engagement hole that engages with the engagement portion of the stay and a through hole that matches the rivet hole of the stay, A solar heat collecting tube characterized in that the stay is riveted onto the heat collecting plate with the engaging portion of the stay engaged with the engaging hole of the heat collecting plate.