Solar heat collector arrangement

A solar heat collector arrangement including at least one straight-tubing type solar heat collector and first and second frame members for supporting the straight-tubing type solar heat collector. A reflector mirror is provided for directing sunrays into the heat collector. The first frame member includes a round mount opening for receiving one end of the heat collector and the second frame member includes a semi-circular groove for receiving the other end of the heat collector. Resilient annuluses are mounted on each end of the heat collector for protecting the heat collector. The heat collector, the resilient annuluses and the reflector mirror are fitted one upon another into the opening in the first frame member and on the groove in the second frame member. A retainer is provided for holding the resilient annulus and the reflector mirror from above, the retainer is mounted for detachably connecting the heat collector relative to the first and second frame members.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to a solar heat collector arrangement including a 
plurality of reflector mirrors, which are adjustable with respect to an 
angle of inclination, and a simplified structure for supporting a 
plurality of solar heat collectors. 
2. Description of Background Information 
A conventional mechanism for turning reflector mirrors for directing 
sunrays used with solar heat collectors comprises a linkage or gear 
mechanism which is complicated due to a considerable number of the parts 
required to operate the mechanism. Once rusted, the mechanism does not 
work well and, with the lapse of time, renders the mirror device useless. 
Further, such mirror-turning mechanisms are often out of order due to the 
considerable number of the parts required which results in a rather 
complicated structure and an increase in costs. Thus, there is a great 
deal to be desired with respect to material savings. 
In addition, since some metal parts are in direct contact with the heat 
collectors, the collectors are prone to damage. This construction is one 
cause for a reduction in the service life of the prior art collector 
arrangements. 
SUMMARY AND OBJECTS OF THE INVENTION 
A main object of this invention is to eliminate the prior art drawbacks by 
the provision of a novel solar heat collector arrangement wherein the 
number of the parts required can be decreased to simplify construction. 
Another object of the present invention is to provide a solar heat 
collector arrangement wherein the angle of inclination of the reflector 
mirrors can be adjusted at discretion, if required. 
Further, the heat collectors of the present invention can be supported in 
place without bringing them into contact with the surface of metal parts 
to enable the arrangement to be used over an extended period. 
Appreciable improvements are introduced by the present invention in the 
efficiency of both the mirrors and the arrangement. 
Further scope of applicability of the present invention will become 
apparent from the detailed description given hereinafter. However, it 
should be understood that the detailed description and specific examples, 
while indicating preferred embodiments of the invention, are given by way 
of illustration only, since various changes and modifications within the 
spirit and scope of the invention will become apparent to those skilled in 
the art from this detailed description.

DETAILED DESCRIPTION OF THE INVENTION 
Referring to FIGS. 1-3, a straight-tubing type solar heat collector 1 
(hereinafter referred to as the heat collector) includes an outer glass 
tube 1a having an open end and a closed end and an inner glass tube 1b 
having an open end and a closed end. The open end of the heat collector 1 
is located on the side of a header of a solar heat collector arrangement 
and the closed end is located on the side of a tail thereof. In the 
embodiment illustrated in FIG. 1, the heat collector arrangement includes 
a set of eight heat collectors 1 arranged in parallel with one another and 
fixed to frames 4 and 16 in the manner described below. 
Reference will first be made to the mechanism for supporting the header 
side of a reflector mirror 8. 
The frame 4 is provided on one side, as viewed in its lengthwise direction, 
with round mount openings 5 corresponding in number to the number of the 
collectors 1. The round mount openings 5 have a diameter larger than the 
diameter of the heat collectors 1. 
A rubber annulus 6 is fitted into each mount opening 5, which functions as 
a resilient annulus for the protection of the open end of each heat 
collector 1. The resilient ring 6 includes an outward flange 7, as will be 
understood from FIG. 3. The above-mentioned rubber annulus may be 
substituted with a like member formed of other material having a 
relatively high coefficient of friction. 
The reflector mirror 8 is of a substantially involute shape in section, and 
has a length corresponding to that of the heat collector 1. The mirror is 
fixed at the lower bottom of its end to a stay 9 by suitable means such as 
welding. The stay 9 is rotatably fitted into the frame 4. As depicted in 
FIG. 5, the stay 9 includes a lateral flange 10a for supporting the 
reflector mirror 8. 
The stay 9 is notched at 10b on its upper surface. In this embodiment, the 
notch 10b may be of a semi-circle in section and have a diameter equal to 
the outer diameter of the resilient annulus 6. The stay 9 also includes a 
semi-circular insert 11 which is positioned in concentrical relationship 
to the notch 10b and extends in the direction away from the flange 10a. 
The insert 11 is disposed between the mount opening 5 and the resilient 
annulus 6, and is rotatable either clockwise or counterclockwise within 
the opening 5. 
A header pipe 12 is in communication with a pipe 13 which is arranged 
within each heat collector 1 for the circulation of a heat medium. The 
header pipe 12 is provided with a joint 14 which communicates with a hot 
water supply pipe or an adjacent solar heat collector arrangement. 
The mechanism for turning the tail side of the reflector mirror 8 will be 
explained hereinafter. 
A rubber cap 15 is provided having a relatively high coefficient of 
friction. The rubber cap 15 is positioned on the closed end of the 
collector 1 and serves as a resilient covering to protect the closed end 
of the collector 1. The resilient cap 15 is partly provided on its outer 
surface with a groove 15a, and an outwardly projecting flange 15b. 
An L-shaped frame 16 is located on the side of the tail of the collector 
arrangement. The frame 16 is provided in its vertical portion with a 
semi-circular groove 17 for rotatably supporting the resilient cap, and 
includes a lateral flange 18. 
A stay 19 for rotatably mounting the tail-side end of the reflector mirror 
8 is provided which includes a flange 20 on one side to fix the tail-side 
end. As shown in FIG. 8, the stay 19 is provided on its other side with a 
notch 21 having a diameter equal to the outer diameter of the resilient 
cap (or rubber cap) 15. A semi-circular insert 22 is located in 
concentrical relation to the notch 21 and is disposed between the 
resilient cap (or rubber cap) 15 and the semi-circular groove 17. Like the 
insert 11, the insert 22 is also rotatable either clockwise or 
counterclockwise within the groove 17. 
A semi-circular retainer 23 is fitted from above into the groove 15a in the 
resilient annulus 15. The retainer 23 is formed with flanges 24 by bending 
both of its ends outwardly. The flanges 24 are fixed to the flange 18 by 
means of a bolt 25 to prevent undesirous turning of the resilient annulus 
15, the heat collector 1 and the reflector mirror 8. 
Referring to FIGS. 1, 3 and 4, a selective absorption film 26 is applied 
over the surface of the inner tube 1b by vapor deposition. A spacer 
fitting 27 including a getter metal 28 is provided on the closed end of 
the inner tube 1b. A spring ring 29 is included to space the inner tube 1b 
relative to the outer tube 1a. An insulating layer of vacuum 30 is 
provided in the spaced formed between the inner and the outer tubes 16, 
1a. A connecting rod 31 is mounted between the frames 4, 16. 
In assembling the foregoing embodiment, the resilient annulus 6 and 
resilient cap (or rubber cap) 15 are fitted in advance onto the open and 
closed ends of the heat collector 1. The reflector mirror 8 is supported 
in a horizontal state by positioning the insert 11 of the stay 9 into the 
mount opening 5 in the frame 4. Thereafter, the insert 22 of the stay 19 
is positioned on the semi-circular notch 17 in the frame 16. Subsequently, 
the heat collector 1 is horizontally supported on the frames 4 and 16 by 
inserting the heat medium-circulating pipe 13 (communicating with the 
header pipe 12) through the open end of the collector 1, fitting the 
resilient annulus 6 (located on the open side of the collector 1) into the 
round mount opening 5, and placing the resilient cap (or rubber cap) 15 
(fixed on the closed end of the collector 1) on the semi-circular groove 
17 in the frame 16. 
After the solar heat collector is assembled according to the present 
invention, the direction of the reflector mirror 8 can be adjusted in this 
state. The reflector mirror 8 is released by loosening the bolt 25 
threaded into the retainer 23, so that the inserts 11 and 22 of both stays 
9 and 19 slide between the opening 5 and the groove 17 and the resilient 
annulus 6 and resilient cap (or rubber cap) 15 while turning around the 
axis of the heat collector 1. It is thus possible to locate the reflector 
mirror 8 in the desired direction that is most effective with respect to 
heat collection. Thereafter, the reflector mirror 8 is secured in the 
predetermined direction by fastening the retainer 23 with the bolt 25. 
The present invention provides a solar heat collector arrangement including 
a straight-tubing type solar heat collector 1 and first and second frames 
4, 16 for supporting the heat collector 1. A reflector mirror 8 is 
provided for directing sunrays. The first frame 4 is provided with a round 
mount opening 5 for mounting said heat collector 1. The second frame 16 is 
provided with a semi-circular groove 17 for mounting the heat collector 1. 
Resilient annulus 6 and resilient cap 15 are provided for the protection 
of both end of said heat collector 1. The resilient annulus 6 and 
resilient cap 15 and the reflector mirror 8 are fitted, with one upon 
another, into the opening 5 and groove 17. The heat collector 1 is 
detachably formed at the end associated with said second frame 16 with a 
retainer 23 which holds the resilient annulus 6 and resilient cap 15 and 
the reflector mirror 8 from above. 
According to the present invention, the angle of inclination of the 
reflector mirror 8 can be easily adjusted. For example, it is possible to 
secure the reflector mirror 8 in the desired direction that is most 
effective in view of reflection efficiency with great ease while 
installing the collector arrangement on the roof or wall of a building or 
house. More over, the means for turning the reflector mirror 8 has a 
limited number of parts and is thus of a very simplified structure wherein 
the reflector mirror 8 is supported by the resilient annulus 6 and 
resilient cap 15. This assures that the inventive arrangement can be used 
over an extended period with no fear of any trouble, and assembled at a 
relatively low cost. 
In addition, since both ends of the heat collector 1 are securely held by 
the resilient annulus 6 and resilient cap (or rubber cap) 15 which also 
hold the reflector mirror 8 in association with the frames 4 and 16 by use 
of frictional forces, the reflector mirror 8 does not rock or oscillate 
due to vibrations, once secured. Since the reflector mirror 8 is 
restrained from undesirous movement during turning, the fine adjustment of 
the angle of inclination of the mirror can be effected easily. Replacement 
of the heat collector with a new one can easily be performed by merely 
removing the retainer. 
The invention being thus described, it will be obvious that the same may be 
varied in many ways. Such variations are not to be regarded as a departure 
from the spirit and scope of the invention, and all such modifications as 
would be obvious to one skilled in the art are intended to be included 
within the scope of the following claims.