JP2002139255A - Solar heat collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar heat collector which can suppress the dislocation of heat collecting fins without adding surplus members, and is efficient. SOLUTION: This is a solar heat collector where a plurality of headers 2 and 4 are connected in parallel with each other by a plurality of branch pipes 3 and a heat medium is circulated to both of the header pipes 2 and 4 and the branch pipes 3, and here the long heat collecting fins 5 are attached from one end to the other end of the branch pipes 3, and some parts of both ends in longitudinal direction of the heat collecting fins 5 are extended to the flank sides of the header pipes 2 and 4 more than other sections.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar heat collector, such as a solar heat collector, which raises the temperature of a heat medium by using solar energy. The present invention relates to a solar heat collecting apparatus having a possible structure.

[0002]

2. Description of the Related Art As shown schematically in FIG. 4, a flat-plate type solar heat collector J used in a forced circulation solar hot water supply system stores solar energy in a case 70 made of metal, glass or the like. It is provided with a heat collecting part 71 for absorbing and is installed in a sunny place such as a roof of a house.

The heat collecting section 71 is mainly composed of a first header pipe 72 made of metal into which a heat medium flows, and a plurality of branch pipes connected to the first header pipe 72 and also made of metal. 73, a second header tube 74 connected to the plurality of branch tubes 73 to allow the heat medium to flow out, and a heat collecting fin 75 joined to the upper surface of the branch tube 73 and made of metal or the like. The heat collecting fins 75 are provided for the purpose of efficiently collecting sunlight, whereby the heat medium in the heat collecting unit 71 is efficiently heated. The main flow of the heat medium is indicated by white arrows in the figure.

As described above, in a device in which the heat collecting fins 75 provided on a plurality of branch pipes are arranged in parallel, the heat collecting fins 75
When a rapid thermal change acts on the heat collecting fins 75, the heat collecting fins 75 expand and contract greatly. Thus, when the heat collecting fins deviate from the regular positions, efficient heat collection by sunlight is not performed.

Therefore, conventionally, a heat collecting fin has been caulked to the branch pipe, and the displacement has been suppressed while adjusting the caulking force. If the caulking force is too strong, the branch pipe will be deformed and cause a drift of the heat medium, causing a decrease in heat collection efficiency.If it is too weak, the contact between the branch pipe and the heat collection fins will be loosened, thereby causing Heat transfer is also reduced, which also causes a decrease in heat collection efficiency. Therefore, 6-32
In the technique disclosed in Japanese Patent Application Publication No. 967, a method has been proposed in which the deviation of the heat collecting fin from the normal position is suppressed using a stopper of another member.

[0006]

However, even if the branch pipe is held down by a caulking force, if the thermal shock is repeatedly received for a long period of time, the branch pipe and the heat collecting fins gradually separate from each other, and the displacement of the heat collecting fins is reduced. Come up. Since the speed of this shift differs due to the difference in the caulking force between the branch pipe and the heat collecting fin, each heat collecting fin moves to a different position, which is not preferable in appearance.

Further, a fixing method using a stopper of a separate member is not desirable because positioning during manufacture of the stopper and addition of an extra member occur.

Accordingly, an object of the present invention is to provide an efficient solar heat collecting apparatus capable of suppressing the above-mentioned displacement of the heat collecting fins without adding an extra member.

[0009]

In order to achieve the above object, a solar heat collecting apparatus of the present invention comprises a plurality of header pipes connected in parallel by a plurality of branch pipes, and the header pipe and the branch pipes are connected to each other. A solar heat collector configured to allow a heat medium to flow through both, while attaching a long heat collecting fin from one end to the other end of the branch pipe, at both ends in the longitudinal direction of the heat collecting fin. A part thereof is extended to the side surface of the header tube. Further, the heat collecting fins are particularly bent and brought close to or in contact with the side surface of the header tube. As a result, even if the long heat collecting fins are displaced in the longitudinal direction, a part (the bent surface) of the heat collecting fins at both ends in the longitudinal direction is in contact with the header tube, so that the heat collecting fins are strongly suppressed from growing. As a result, the displacement can be reliably suppressed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the drawings schematically illustrating the embodiment.

FIGS. 1 (a) and 1 (b) show a heat collecting section 1 of a solar heat collecting apparatus, and FIG. The other configuration is the same as that of the solar heat collecting apparatus shown in FIG. 4 already described, and the description is omitted.

As shown in FIGS. 1 and 2, a plurality of header tubes 2 and 4 are connected in parallel by a plurality of branch tubes 3 so that a heat medium flows through both header tubes 2 and 4 and branch tube 3. However, from one end 3a of the branch pipe 3 to the other end 3a.
The heat collecting fins 5 having a long and plate shape are attached over the b, and the extended portions 7 are provided on a part of both ends in the longitudinal direction of the heat collecting fins 5, and this portion is formed into an L-shaped case (not shown). The bent portion 7a bent toward the lower surface of the header tube 2 is brought close to or in contact with the side surfaces of the header tubes 2, 4. The bent portion 7a
May be a flat surface, or may be a curved surface according to the side surface shape of the header tubes 2 and 4, but may be made to approach or contact the side surfaces of the header tubes 2 and 4 linearly without bending. .

In this embodiment, as shown in FIG. 1, a heat collecting section 1 is constituted by eight heat collecting elements E1 to E8 mainly composed of header tubes 2 and 4, branch tubes 3 and heat collecting fins 5. I have. The heat collecting element E1 is different from the other heat collecting elements in the position of the extension portion 7. However, this is because when connecting a large number of heat collecting portions 1, one end 2a of the header tube 2 and one end of the header tube 4 are connected. This is because a space is provided so that the portion 4a can be connected to the header tube of another heat collecting portion.

Here, the header pipes 2, 4 and the branch pipe 3 are
The heat collecting fins 5 are made of a metal such as aluminum or copper, which has good heat conduction and is easily formed, such as copper, aluminum, and stainless steel.

The heat collecting fins 5 are joined to the branch pipes 3 by brazing or the like. It has a contact structure.

Thus, according to the solar heat collecting apparatus of the present invention, the header tubes 2 and 4 serve as stoppers in the longitudinal direction of the heat collecting fins 5, so that even if the heat collecting fins 5 are displaced, the heat collecting fins 5 are greatly deformed so as to impair the appearance. Never. Thereby, it is possible to reliably prevent the heat collector fin 5 from being displaced in the long side direction caused by a thermal shock, such as immediately after the start of operation after so-called dry heating, in which the heat collector 1 becomes hot and the heat medium flows. Thus, it is possible to provide an efficient and excellent solar heat collecting apparatus.
In addition, even if the long heat collecting fins 5 are to be displaced in the longitudinal direction, the displacement is more firmly suppressed by contacting the header tube with the curved surface as compared with the case where there is no curved surface (contact with a line). Can be.

As shown in FIG. 3, the heat collecting fin 5 has one end extending in the direction of the heat collecting plate surface with the branch pipe 3 interposed therebetween.
7, a bent portion 17a may be provided, and an extension portion 18 and a bent portion 18a may be provided on the other side in the direction of the back surface of the heat collecting plate. By doing so, even if a force that is displaced in the longitudinal direction of the heat collecting element acts, the heat collecting fins 5 are almost in contact with the header tubes 2 and 4, so that the displacement is prevented as much as possible. In particular, this produces the same effect as the above embodiment, and furthermore, the portions in contact with the header tubes 2 and 4 are bent at both ends in the up and down direction of the heat collector, thereby further preventing the displacement and bending. It can be structured. The end of the heat collecting fin bent in the direction opposite to the light receiving side of the heat collecting part in the back direction contacts the bottom plate of the case (not shown), so that the heat collecting fin also plays a role of preventing deflection.

[0018]

As described above, according to the solar heat collecting apparatus of the present invention, a long heat collecting fin is provided from one end to the other end of the branch pipe, and both ends of the heat collecting fin in the longitudinal direction are provided. Is made closer to or in contact with the side surface of the header tube than the other portion, so that the header tube functions as a stopper even if the heat collection fins are extended by thermal expansion. In other words, it is possible to reliably prevent the heat collector fin from being shifted in the long side direction generated by thermal shock such as immediately after the start of operation after so-called empty heating, in which the heat collector flows at a high temperature and the heat medium flows,
This makes it possible to provide an efficient and reliable solar heat collecting apparatus.

Further, by bending a part of the heat collecting fins at both ends in the longitudinal direction, even if the long heat collecting fins are displaced in the longitudinal direction, the heat collecting fins come into contact with the header tube at the bent surface. It is possible to more firmly suppress the displacement as compared with the case where there is no (contact with a line).

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating a heat collecting section of a solar heat collecting apparatus according to the present invention, wherein (a) is a plan view and (b) is a side view.

FIGS. 2 (a) and (b) are FIGS. 1 (a) and (b), respectively.
FIG.

FIG. 3 is a partially enlarged view schematically illustrating a modified example of the solar heat collecting apparatus according to the present invention, where (a) is a plan view and (b).
Is a side view.

FIG. 4 is a plan view illustrating a conventional solar heat collecting apparatus.

[Explanation of symbols]

 1: Heat collecting section 2, 4: Header pipe 3: Branch pipe 5: Heat collecting fin 7, 17, 18: Extension section 7a, 17a, 18a: Bent section E1 to E8: Heat collecting element

Claims (2)

[Claims] 1. A solar heat collecting apparatus, wherein a plurality of header tubes are connected in parallel by a plurality of branch tubes so that a heat medium flows through both the header tubes and the branch tubes. A long heat collecting fin is attached from one end to the other end of the heat collecting fin, and a part of both ends in the longitudinal direction of the heat collecting fin is extended to a side surface of the header tube. Thermal equipment. 2. The solar heat collecting apparatus according to claim 1, wherein a part of each of the heat collecting fins at both ends in a longitudinal direction is bent.