JPH0424614B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vacuum glass tube type heat collecting member that includes a reflecting plate, a heat collecting pipe, and a heat collecting plate joined to the heat collecting pipe. This relates to solar heat collection tubes.

BACKGROUND TECHNOLOGY In a conventional vacuum glass tube type solar heat collection tube, a heat collection pipe and a heat collection plate having a width close to the inner diameter of the glass tube are bonded together, and the sunlight incident on the glass tube is received by the heat collection plate. Recently, due to applications at higher temperatures,
Vacuum glass tube type solar heat collection tubes are being developed that provide a reflector inside the vacuum glass tube and concentrate as much sunlight as possible entering the glass tube onto the heat collection pipe to raise the heat medium to a high temperature. By the way, the supporting member of a vacuum glass tube type solar heat collecting tube that houses this type of reflector needs to firmly support the heat collecting member consisting of the reflector and the heat collecting pipe or the heat collecting plate at a predetermined position inside the glass tube. Yes, and when collecting heat, the heat collecting member is
Although the temperature reaches a high temperature of about 100 to 300°C, the reflector is at about the same temperature as the outside temperature, so it is necessary to absorb these differences in thermal expansion to prevent deformation of the reflector and the heat collecting member. In addition, it is necessary to prevent proper light collection from being lost due to misalignment of the reflector and heat collecting member due to vibrations during transportation or construction, and to prevent the reflector and support members from damaging the inner surface of the glass tube. There is.

For this reason, conventional methods have been to prevent deformation of the reflector by joining a support made of a stainless steel plate or the like along the entire length of the reflector, and to support the support member by joining the support member to the support by welding, or by attaching a support member to the reflector in advance. A method has been adopted in which heat collecting members are directly joined by welding or the like and then supporting members are installed.

Problems to be Solved by the Invention The above conventional methods all have complicated structures, so it takes a lot of time to attach the supporting members to the reflecting plate and the heat collecting member, and they also require the use of auxiliary members. Therefore, the cost will be high. Furthermore, since the vacuum glass tube type solar heat collector tube has a total length of 1 to 3 meters, there was a problem in that the weight would increase significantly if a support was provided on the reflecting plate.

Means for Solving the Problems The present invention provides a vacuum glass tube type heat collecting member comprising a reflector, a heat collecting pipe, and a heat collecting plate joined to the heat collecting pipe, housed inside the glass tube. In a solar heat collecting tube, a substantially arc-shaped support leg that presses against a collection surface in the glass tube, locking pieces that are integrally provided on both sides of the support leg and that locks both upper side edges of a reflector; a support piece of a heat collecting member that is integrally provided at the center of the lower part of the support leg and inserted in the direction of the axis of the glass tube from the notch hole at the center of the lower part of the reflector; Support members having elastic clamping pieces that are elastically pressed on both sides of the heat collecting member are arranged at appropriate intervals at multiple locations in the longitudinal direction of the glass tube to hold the reflecting plate and the heat collecting member at predetermined positions within the glass tube. It was supported by

Function As described above, in this invention, the supporting leg portion of the supporting member has a substantially arc shape that presses against the inner circumferential surface of the glass tube, and the elastic clamping pieces are elastically pressed against both upper sides of the heat collecting member. Therefore, the support member does not rotate within the glass tube. The reflecting plate, whose upper side edges are secured by the supporting member, is also supported at a predetermined position within the glass tube while maintaining a constant relative position to the heat collecting member, and is protected against vibrations during transportation or construction. Therefore, no positional deviation occurs. In addition, the support piece of the heat collecting member is provided at the center of the lower part of the support leg and inserted in the direction of the axis of the glass tube through the notch hole at the center of the lower part of the reflector, which prevents the light collecting action of the reflector. The heat collecting member can be elastically supported at a predetermined position within the glass tube without having to do so. Further, the supporting member is arranged at appropriate intervals at multiple locations in the longitudinal direction of the glass tube to support the reflecting plate and the heat collecting member at predetermined positions within the glass tube, and the supporting member and the heat collecting member are simply pressed together or Due to the abutting relationship, even if a difference in thermal expansion or the like occurs between the reflection plate and the heat collecting member, it can be absorbed by sliding at the pressure contact or abutment portion, and deformation can be prevented.

Embodiment FIGS. 1 and 2 show a first embodiment of the present invention, in which 1 is a transparent glass tube whose interior is evacuated, and 2 is placed inside the glass tube 1, through which a heat medium flows. U-shaped heat collecting pipe such as copper pipe 2
a, and a heat collecting plate 2b joined to the heat collecting pipe 2a.
3 is a reflection plate made of a thin aluminum plate or the like having a semi-circular cross-section and a thickness of about 0.3 to 0.8 t, which is disposed on the lower half circumference of the inner surface of the glass tube 1 over almost the entire length; Reference numeral 4 indicates a support member made of an elastic member such as a thin plate spring.

The supporting member 4 has a supporting leg portion 4a which is curved to have a substantially arcuate cross section and is in pressure contact with the inner circumferential surface of the glass tube 1.
protrudes in the axial direction of the glass tube 1 on both left and right sides of the support leg 4a, and is inserted and locked into locking holes 3a, 3a formed on both upper side edges of the reflecting plate 3, which has a semicircular cross section. A notch hole 3b is provided at the center of the lower part of the supporting leg part 4a and protrudes in the axial direction of the glass tube 1, and is formed at the center of the lower part of the reflecting plate 3 having a semicircular arc shape in cross section. , 3b, and the heat collecting plate 2b
Support piece portions 4c, 4c are provided to support, and further,
A series of elastic clamping pieces 4d, 4d are provided at both upper ends of the support leg 4a to be elastically pressed against the heat collecting member 2.

The supporting members 4 are installed at a plurality of locations in the longitudinal direction of the reflecting plate 3 and the heat collecting member 2 at appropriate intervals.

In FIGS. 1 and 2, support pieces 4c, 4c
The supporting leg portion 4a is cut and raised to form one piece, and is inserted and locked into a locking hole 2b' formed by punching out a part of the heat collecting plate 2b.

The first embodiment is assembled by attaching the supporting member 4 to the reflecting plate 3 and inserting the heat collecting member 2 from above, and then inserting it into the glass tube 1.

3 and 4 show the second embodiment,
The difference from the first embodiment is that the support pieces 4c, 4c are formed in an L-shape separately from the support leg 4a to facilitate assembly to the reflector 3;
c, 4c and the supporting leg part 4a sandwich the reflecting plate 3 from the inside and outside, and the locking protrusions 4e, 4e cut and raised on the supporting leg part 4a are connected to the notch holes 3b, 3b of the reflecting plate 3 and the supporting pieces 4c, 4c. It is inserted into the notch holes 4c', 4c' and is locked by bending the locking protrusions 4e, 4e.The other configuration is the same as that of the first embodiment, so a description thereof will be omitted. .

5 and 6 show a third embodiment, in which the first and second embodiments are U-shaped heat collecting pipes 2a.
In contrast, in the third embodiment, the U-shaped heat collecting pipe 2a is arranged horizontally, and the heat collecting plates 2b are joined in a V-shape. The difference is that the support pieces 4c, 4c of the support member 4 are Y-shaped so as to be suitable for supporting the V-shaped heat collecting plate 2b. In this case, the support piece 4
c, 4c may be formed integrally by cutting up the support leg 4a as in the first embodiment, or may be formed separately from the support leg 4a as in the second embodiment, and the locking protrusions 4e , 4e, and the fifth
Separate support pieces 4c, 4c as shown in FIG.
are directly superposed on the support leg 4a to form the cutout hole 3 of the reflector plate 3.
b, or simply press it. In addition, in the case where the support leg parts 4c, 4c are formed separately from the support leg part 4a, the support leg part 4a is formed as left and right separately as shown in FIGS. The supporting legs 4a may be integrally attached to each other with rivets or the like, or separate left and right support legs 4a may be attached to the reflector plate 3 with rivets or the like.

The support pieces 4c and 4c shown in FIGS. 5 and 6 are as follows:
As in the first and second embodiments, the heat collecting plate 2b may be inserted and locked into a locking hole 2b' formed by punching.

In each of the above embodiments, the band width of the supporting leg portion 4a at the portion where it joins with the reflecting plate 3 is made wider than the band width at other portions (see FIGS. 2, 4, and 6).
This makes it possible to prevent the reflection plate 3 from being deformed.

Moreover, although the support member 4 is illustrated as a plate material, it may be constructed of a wire rod.

In the third embodiment, the support member 4 is attached to the reflection plate 3, the heat collection member 2 is inserted from above, and this is inserted into the glass tube 1, and the heat collection pipe 2a
As shown in FIG. 7, the end of the glass tube 1 passes through a glass sealing joint 5 welded to the end of the glass tube 1, is led out, and is connected to a header or the like. The inside of the glass tube 1 is evacuated, and a heat medium is passed through the heat collecting pipe 2a to be heated by solar heat.

The heat collecting member 2 and the reflecting plate 3 are supported by supporting members 4 arranged at appropriate intervals at multiple locations in the longitudinal direction of the glass tube 1.
It is supported at a predetermined position within the glass tube 1 so as to be able to absorb the difference in thermal expansion of each member and prevent its deformation.

Effects of the Invention According to the present invention, the supporting member elastically supports the reflecting plate and the heat collecting member at predetermined positions within the glass tube in a state that can absorb the difference in thermal expansion and prevent their deformation. , does not have a negative effect on the light-concentrating effect. In addition, the support member itself has a simple shape and is lightweight, making it easy to manufacture.In addition, it is only necessary to provide notches, etc. at the required locations on the reflector, and no special processing is required on the heat collecting member side. Therefore, it is possible to provide a vacuum glass tube type solar heat collecting tube that can be easily assembled to the reflector plate and the heat collecting member without the need for welding or the like, and is lightweight and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a main part showing a first embodiment of the present invention, FIG. 2 is a perspective view thereof, FIG. 3 is a longitudinal cross-sectional view of a main part of a second embodiment, and FIG. 4 is a perspective view thereof. FIG. 5 is a vertical sectional view of the main part of the third embodiment, FIG. 6 is a perspective view thereof,
FIG. 7 is also a cross-sectional view. DESCRIPTION OF SYMBOLS 1... Glass tube, 2... Heat collection member, 2a... Heat collection pipe, 2b... Heat collection plate, 3... Reflection plate, 4...
...Supporting member, 4a... Supporting leg portion, 4b... Locking piece portion, 4c... Supporting piece portion, 4d... Elastic clamping piece portion.

Claims (1)

[Claims] 1. In a vacuum glass tube type solar heat collection tube in which a heat collection member consisting of a reflector, a heat collection pipe, and a heat collection plate joined to the heat collection pipe is housed inside the glass tube, pressure is applied to the inner peripheral surface of the glass tube. a substantially arc-shaped support leg, a locking piece integrally provided on both sides of the support leg and locking both upper side edges of the reflector, and a locking piece integrally provided at the center of the lower part of the support leg; , a supporting piece of the heat collecting member inserted in the direction of the axis of the glass tube through the notch hole at the center of the lower part of the reflecting plate, and a support piece part formed in series on the upper part of the supporting leg part, which is elastically pushed on both sides above the heat collecting member. A solar heat collecting tube characterized in that supporting members having elastic clamping pieces in contact with each other are arranged at appropriate intervals at multiple locations in the longitudinal direction of the glass tube to support the reflecting and heat collecting members at predetermined positions within the glass tube. .