JPH11344262A - Solar heat collecting plate and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a rotation of heat collecting fins to a heating medium tube and to improve a drawing strength by forming grooves on a coupling portion of the fins for coupling the fins to an outer periphery of the tube, and coupling to engage an outer peripheral surface of the tube with the grooves, thereby improving a coupling strength of the fins to the tube. SOLUTION: The solar heat collecting plate comprises a heating medium tube 12, and heat-collecting fins 15 coupled to the tube 12 in this overall axial length. In this case, when the fins 15 are associated with the heat medium tube 12, the tube 12 is first disposed so that a base 17 as a coupling part at the fins 15 having a pair of fin parts 18 is brought into contact with inner peripheral surfaces of caulked parts 19, and then the parts 19 are caulked to be deformed for the fins 15 to be caulked fixedly to the heat medium tube 12. Then, the tube 12 is buckled at positions corresponding to the grooves 20 formed on the base 17 and the caulked parts 19, and an outer peripheral surface of the heat medium tube 12 is coupled to be engaged with the grooves 20. Thus, adhesive properties of the respective inner peripheral surfaces of the base 17 and the caulked parts 19 with the outer peripheral surface of the heat medium tube 12 are enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar heat collecting plate for collecting solar heat under a vacuum and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, a vacuum glass tube type solar heat collector has been proposed as a solar heat collector for effectively utilizing solar heat not only for hot water supply but also for cooling and heating.

[0003] This vacuum glass tube type solar heat collector is
A solar heat collecting plate composed of a heat collecting fin that collects solar radiation heat and a heat medium tube through which a heat medium flows is housed in a vacuum glass tube, and the heat loss due to heat convection and heat conduction is reduced by vacuum heat insulation. As a result, the heat collection efficiency has been greatly improved.

In the above-described solar heat collecting plate, the heat collecting fins are connected to the outer peripheral surface of the heat medium pipe by expanding, press-fitting, welding, or the like.

[0005]

However, since the heat collecting fins are made of aluminum or an aluminum alloy, and the heat transfer tubes are made of copper or a copper alloy, the linear expansion coefficients of the two under high temperature conditions. Are significantly different. For this reason, when the heat collecting fins are connected to the heat medium tubes by expansion or press fitting, the strength of the connection between the heat collecting fins and the heat medium tubes decreases due to aging, and the heat collecting fins are connected to the heat medium tubes. There is a risk of rotation.

In order to cope with this, if the heat collecting fin is welded to the heat medium pipe, the heat collecting fin having a thin structure may be blown.

The object of the present invention has been made in view of the above circumstances, and provides a solar heat collecting plate capable of improving the bonding strength between a heat transfer tube and a heat collecting fin, and a method of manufacturing the same. It is in.

[0008]

According to the first aspect of the present invention,
In a solar heat collecting plate that heats a heat medium in a heat medium tube by using solar radiation heat collected by the heat collecting fin, the heat collecting fin couples the heat collecting fin to an outer peripheral surface of the heat medium tube. A groove is formed at the connecting portion of the heat medium pipe, and the outer peripheral surface of the heat medium pipe is connected so as to mesh with the groove.

According to a second aspect of the present invention, there is provided a method for manufacturing a solar heat collecting plate which is manufactured by connecting a heat collecting fin to an outer peripheral surface of a heat medium tube, wherein the heat medium tube is accommodated in a caulked portion of the heat collecting fin. In this state, the caulked portion of the heat collecting fin is bent and deformed into the heat medium tube, and the outer peripheral surface of the heat medium tube is engaged with a groove formed at a joint portion of the heat collecting fin, thereby forming the heat collecting fin. After the fins and the heat medium tube are caulked and connected, a part of the outer peripheral surface of the heat medium tube is directly pressed to expand the heat medium tube.

The invention described in claim 1 has the following operation.

Since the outer peripheral surface of the heat transfer tube is engaged with the groove formed in the connection portion of the heat collection fin, the adhesion between the heat transfer fin and the heat collection fin is increased, and the bonding strength between the heat transfer tube and the heat collection fin is improved. Can be improved. As a result, rotation of the heat collecting fin with respect to the heat medium tube can be prevented, and the pull-out strength of the heat collecting fin with respect to the heat medium tube can be improved.

The second aspect of the invention has the following operation.

After swaging the heat collecting fin and the heat transfer tube,
Even if the caulked portion of the heat collecting fins springs back and a gap is formed between the inner surface of the caulked portion and the outer peripheral surface of the heat medium tube, the heat medium tube is expanded thereafter, so that the gap can be eliminated. As a result, the adhesion between the heat collecting fins and the heat medium tube can be improved.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

[A] First Embodiment FIG. 1 is a plan view showing a part of the entire structure of a solar heat collecting apparatus to which the first embodiment of the solar heat collecting plate according to the present invention is applied. is there. FIG. 2 is a sectional view taken along the line II-II in FIG.

In the solar heat collecting apparatus 10 shown in FIG. 1, a plurality of heat collecting units 11 are provided in parallel, and both ends of a heat medium pipe 12 of each heat collecting unit 11 are connected to an inlet header pipe 13 and an outlet header pipe 14. Connected. As shown in FIG. 2, each heat collecting unit 11 includes a heat medium pipe 12 and a heat collecting fin 15 connected over substantially the entire length of the heat medium pipe 12 in the axial direction. It is composed. The heat medium pipe 12 and the heat collecting fin 15 which are integrally connected as described above.
Thereby, the solar heat collecting plate 28 is configured.

The heat medium tube 12 is made of copper or a copper alloy, and a heat medium such as water or antifreeze flows through the inside.

The heat collecting fins 15 are made of aluminum or an aluminum alloy, and collect heat of solar radiation to heat the heat medium in the heat medium pipe 12. This heat collecting fin 15
A selective absorption film is applied to the surface of the solar cell to efficiently absorb solar radiation heat.

The inside of the glass tube 16 is about 10 ^-4 To.
rr is maintained in a high vacuum state to form a heat insulating structure.
Due to this vacuum heat insulating action, heat loss due to heat convection and heat conduction is reduced, and heat collection efficiency in a high temperature range is improved.

Accordingly, the heat medium flowing from the inlet header pipe 13 into the heat medium pipes 12 of the heat collecting units 11 is exchanged with the solar radiation heat collected by the heat collecting fins 15 in the glass tube 16, It is heated and flows out into the outlet header pipe 14.

As shown in FIGS. 2 to 4, a heat collecting fin 15 of each heat collecting unit 11 has a base 17 extending in the axial direction of the heat transfer pipe 12 and having a semicircular cross section.
And a pair of fin portions 18 and caulking portions 19, each of which extends integrally from both sides. The base portion 17 and the caulking portion 19 function as a connecting portion. The fin portion 18 and the caulking portion 19 are formed over substantially the entire length of the base portion 17 in the longitudinal direction, and are provided orthogonal to each other before the heat collection fin 15 is assembled to the heat medium pipe 12 (FIG. 3A). Grooves 20 (FIG. 3B) extending in the longitudinal direction of the heat collecting fins 15 are formed on the inner peripheral surface 17A of the base 17 and the inner surface of the caulking portion 19 which are continuous with each other.

The assembling of the heat collecting fins 15 to the heating medium tube 12 is performed as follows. First, as shown by a two-dot chain line in FIG. 3A, the heat medium pipe 12 is arranged so as to be in contact with the inner peripheral surface 17 </ b> A of the base portion 17 and the inner surface of the caulking portion 19 in the heat collecting fin 15. Next, the caulking portion 19 is caulked and deformed in the direction of the heat medium tube 12 so as to be in contact with the outer peripheral surface 12A of the heat medium tube 12, and the heat collecting fin 15 is caulked and fixed to the heat medium tube 12. At this time, as shown in FIG. 3A, the length of the pair of caulking portions 19 in the direction orthogonal to the fin portions 18 is equal to the length of the remaining half excluding the half outer circumference of the heat medium pipe 12 covered with the base portion 17. A pair of caulked portions 1 formed shorter than the dimension that completely covers the outer circumference
9, a gap 21 is formed between both tip portions.
(A)). Therefore, thereafter, as shown in FIG.
A part of the heat medium pipe 12 exposed by the gap 21
It is pressed in the center direction A of the heat medium pipe 12 and is processed as a flat part 22. In this way, the heat collecting fins 15 are assembled to the heat medium tube 12.

Even if the caulking portion 19 is separated from the outer peripheral surface 12A of the heat medium tube 12 by springback after the caulking deformation, after forming the flat portion 22, both sides of the flat portion 22 in the heat medium tube 12 are in the direction of arrow B. The outer peripheral surface 12 </ b> A of the heat medium pipe 12 and the inner peripheral surface 19 </ b> A of the caulked portion 19 of the heat collecting fin 15 are brought into close contact with each other. Further, due to the processing force acting in the center direction A of the heat medium tube 12 when the flat portion 22 is formed, the heat medium tube 12 and the base portion 17 and the caulking portion 19 of the heat collecting fin 15 are moved in the left-right direction in FIG. Is transformed into an elliptical shape having a long axis.

The outer peripheral surface 12A of the heat medium pipe 12 and the heat collecting fin 1
As for the close contact between the inner peripheral surface 17A of the base 17 and the inner peripheral surface 19A of the caulked portion 19 in FIG. 5, as shown in FIG. 4B, the position corresponding to the groove 20 formed in the base 17 and the caulked portion 19 As a result, the heat medium pipe 12 breaks down and has a polygonal cross-sectional shape together with the base portion 17 and the caulking portion 19. And
The outer peripheral surface 12 </ b> A of the heat medium pipe 12 is joined so as to mesh with the groove 20, and the base 17 and the caulked portion 1 of the heat collecting fin 15 are formed.
9 and the heat medium tube 12 are increased in bonding strength.

FIG. 5 is a cross-sectional view of jigs 23 and 24 used when assembling the heat collecting fins 15 to the heat medium pipe 12. The heat collecting fin 15 is placed on the jig 24 by fitting the base 17 of the heat collecting fin 15 into the concave portion 25 of the jig 24. The heating medium tube 12 is arranged inside the base 17 of the heat collecting fin 15, the concave portion 26 of the jig 23 is opposed to the caulking portion 19 of the heat collecting fin 15, and the jig 23 and the jig 24 are approached. Let it. As a result, the inner surface of the jig 23 that defines the recess 26 deforms the caulked portion 19 toward the center of the heat medium tube 12. At the same time, the projecting portion 27 formed in the concave portion 26 of the jig 23 presses the heating medium tube 12 to form the flat portion 22.

Therefore, the solar heat collecting plate 2 of the above embodiment
According to No. 8, the following effects are obtained.

A groove 20 is formed in the inner peripheral surface 17A of the base portion 17 and the inner peripheral surface 19A of the caulking portion 19 of the heat collecting fin 15, and the outer peripheral surface 12A of the heat medium pipe 12 is joined so as to mesh with the groove 20. From the base 17 and the caulking portion 19
Adhesion between the inner peripheral surfaces 17A and 19A of the heat medium tube 12 and the outer peripheral surface 12A of the heat medium tube 12 is enhanced, and the bonding strength between the heat medium tube 12 and the heat collecting fins 15 can be improved. As a result, it is possible to prevent the heat collecting fins 15 from rotating around the axis of the heat medium pipe 12, and also prevent the heat collecting fins 15 from being drawn out in the axial direction of the heat medium pipe 12, thereby improving the pull-out strength. Can be.

After the caulking portion 19 of the heat collecting fin 15 is crimped and the heat collecting fin 15 is assembled to the heat medium tube 12, the flat portion 22 is formed on the heat medium tube 12. Both ends of the part 22 are expanded, whereby
Outer peripheral surface 12A of heat medium pipe 12 and inner peripheral surface 19 of caulked portion 19
Adhesion with A can be improved.

With the heat collecting fins 15 attached to the heat medium pipe 12, the base 17 and the caulking portion 19 of the heat collecting fins 15 are provided.
And the heat transfer tube 12 are formed in an elliptical shape, so that the heat collection fin 15 is connected to the heat transfer tube 12 in comparison with the case where the base 17 and the caulked portion 19 of the heat collection fin 15 and the heat transfer tube 12 are perfectly circular. 12
Can be further prevented from rotating relative to each other about the axis.

[B] Second Embodiment FIG. 6 is a cross-sectional view showing a solar heat collecting plate according to a second embodiment of the present invention before a heat collecting fin and a heat medium pipe are assembled. is there.

In the solar heat collecting plate 30, the heat collecting fins 32 of the heat collecting unit 31 are press-fitted and fixed to the heat medium pipe 33.

Also in this case, a groove 35 is formed in the inner peripheral surface 34A of the base 34 of the heat collecting fin 32, and when the heat medium pipe 33 is pressed into the base 34, the outer peripheral surface 33A of the heat medium pipe 33 is formed. The flat portion 36 penetrates the groove 35 and is partially formed in the heat medium pipe 33.
Is formed, the heat medium pipe 33 is expanded, and the base 34 and the heat medium pipe 33 are formed in an elliptical shape having a long axis in the left-right direction in FIG. For these reasons, the solar heat collecting plate 30 of the present embodiment also has the same effects as those of the solar heat collecting plate 28.

[C] Third Embodiment FIG. 7 is a sectional view showing a heat collecting unit to which a third embodiment of the solar heat collecting plate according to the present invention is applied.

The solar heat collecting plate 40 includes a heat collecting unit 4
A plurality of, for example, two heat medium tubes 43 are fixed to one heat collecting fin 42 in the same manner as in the first embodiment.

That is, the groove 46 is formed in the inner peripheral surface 44A of the base 44 of the heat collecting fin 42 and the inner peripheral surface 45A of the caulking portion 45, and the base 44 and the caulking portion 45 of the heat collecting fin 42 When fixed by caulking, the outer peripheral surface 43A of the heat medium pipe 43 meshes with the groove 46, and a flat portion 47 is formed in the heat medium pipe 43. Further, the base 44 and the caulked portion 45 of the heat collecting fin 42 are The tube 43 is formed in an elliptical shape.
Therefore, in this case as well, the solar heat collecting plate 2 of the first embodiment is used.
The same effects as the effects 1 to 8 are achieved. Note that reference numeral 48 in FIG. 7 indicates a glass tube.

[D] Fourth Embodiment FIG. 8 is a cross-sectional view showing one heat collecting unit to which a fourth embodiment of the solar heat collecting apparatus according to the present invention is applied.

The solar heat collecting plate 50 includes a heat collecting unit 5
A heat collecting fin 53 having an arc-shaped fin portion 59 is accommodated in one glass tube 52, and a U-shaped heat medium tube 54 is disposed in the heat collecting fin 53. A heat medium pipe 54 is fixed by caulking to the heat collecting fins 53.

That is, the groove 57 is formed in the inner peripheral surface 55A of the base 55 of the heat collecting fin 53 and the inner peripheral surface 56A of the caulking portion 56, and the base 55 and the caulking portion 56 of the heat collecting fin 53 are connected to the heat medium pipe 54. When fixed by caulking, the outer peripheral surface 54A of the heat medium pipe 54 is engaged with the groove 57, and a flat portion 58 is formed in the heat medium pipe 54. Further, the base 55 and the caulked portion 56 of the heat collecting fin 53 are connected to the heat medium The tube 54 is formed in an elliptical shape.
Therefore, also in this case, the same effects as those of the solar heat collecting plate 28 of the first embodiment can be obtained.

Although the present invention has been described based on one embodiment, the present invention is not limited to this. For example, in each of the above embodiments, the grooves 20, 35, 4
6, 57 are formed on the side of the heat collecting fins 15, 32, 42, 53, but the heat medium tubes 12, 33, 43, 5
4 may also be formed on each of the outer peripheral surfaces 12A, 33A, 43A, and 54A.
A, 43A, and 54A may be formed only.

Further, the grooves 20, 35, 46, 57 are
Bases 17, 44 in the heat collecting fins 15, 42, 53,
55, or only the inner circumferential surfaces 19A, 45A, 56A of the caulked portions 19, 45, 56.
Only it may be formed.

[0041]

As described above, according to the solar heat collecting plate of the present invention, the groove is formed in the connecting portion of the heat collecting fin for connecting the heat collecting fin to the outer peripheral surface of the heat medium tube. Since the outer peripheral surfaces of the heat transfer tubes and the heat collecting fins are joined to be engaged with the grooves, the bonding strength between the heat transfer tube and the heat collecting fins can be improved.

Further, according to the method of manufacturing a solar heat collecting plate according to the present invention, the outer peripheral surface of the heat collecting tube is engaged with the groove formed at the joint of the heat collecting fin, thereby forming the heat collecting fin and the heat collecting tube. After caulking and joining the heat collecting fins and the heat medium fins, the heat medium fins and the heat medium fins are swaged together. The gap formed between the inner surface of the caulked portion and the outer peripheral surface of the heat transfer tube can be eliminated by the springback of the portion, and as a result, the adhesion between the heat collection fin and the heat transfer tube can be increased, and the connection between the heat collection fin and the heat transfer tube can be achieved. Strength can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a part of the entire structure of a solar heat collecting apparatus to which a first embodiment of a solar heat collecting plate according to the present invention is applied.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

3A is a cross-sectional view before assembling a heat collecting fin and a heat medium tube, and FIG. 3B is an enlarged cross-sectional view of a IIIB portion in FIG. 3A.

4A is a cross-sectional view showing an assembled state of the heat collecting fins and the heat medium tubes of FIG. 2, and FIG. 4B is an IVB of FIG. 4A.
It is a part enlarged sectional view.

FIG. 5 is a cross-sectional view showing a jig for assembling the heat collecting fins to the heat medium pipe in FIG. 2;

FIG. 6 is a cross-sectional view showing a state before assembling heat collecting fins and a heat medium pipe in a second embodiment of the solar heat collecting plate according to the present invention.

FIG. 7 is a sectional view showing a heat collecting unit to which a third embodiment of the solar heat collecting plate according to the present invention is applied.

FIG. 8 is a sectional view showing a heat collecting unit to which a fourth embodiment of the solar heat collecting plate according to the present invention is applied.

DESCRIPTION OF SYMBOLS 10 Solar heat collecting device 12 Heat medium tube 12A Outer peripheral surface 15 Heat collecting fin 16 Glass tube 17 Base 17A Inner peripheral surface 19 Caulking portion 19A Inner peripheral surface 20 Groove 28 Solar heat collecting plate 30 Solar heat collecting plate 32 Heat collecting fin 33 Heat medium tube 33A Outer surface 34 Base 34A Inner surface 35 Groove 40 Solar heat collector 42 Heat collecting fin 43 Heat medium tube 43A Outer surface 44 Base 44A Inner surface 45 Caulked portion 45A Inner surface 46 Groove 50 Solar heat collecting plate 51 Heat collecting unit 53 Heat collecting fin 54 Heat medium tube 54A Outer peripheral surface 55 Base 55A Inner peripheral portion 56 Caulked portion 56A Inner peripheral portion 57 Groove

Claims (2)

[Claims] 1. A solar heat collecting plate for heating a heat medium in a heat medium tube using solar radiation heat collected by a heat collecting fin, wherein the heat collecting fin is connected to an outer peripheral surface of the heat medium tube. A solar heat collecting plate, wherein a groove is formed in a connecting portion of the heat collecting fin to be formed, and an outer peripheral surface of the heat medium pipe is connected so as to mesh with the groove. 2. A method for manufacturing a solar heat collecting plate, wherein a heat collecting fin is coupled to an outer peripheral surface of a heat medium pipe, wherein the heat collecting tube is accommodated in a caulked portion of the heat collecting fin. The caulking portion of the heat fin is bent and deformed into the heat medium tube, and the outer peripheral surface of the heat medium tube is engaged with a groove formed at a joint portion of the heat collection fin, thereby forming the heat collection fin and the heat medium tube. And a method of manufacturing the solar heat collecting plate, wherein the heat medium pipe is expanded by directly pressing a part of the outer peripheral surface of the heat medium pipe.