JPH0120610Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in solar heat collectors.

The present applicant previously proposed that in a rectangular flat plate-like body, first and second flow paths that serve as water collection headers are formed along opposing first and second sides, and third and fourth sides that are opposed between them. a large number of third flow paths which are heat receiving paths parallel to each other and inclined at a certain angle with respect to each other; one end is connected to the largest cross-sectional end of the first flow path, the other end is connected to the second side and is a cold water inlet; He developed a solar heat collector with a fourth path and filed an application as Utility Model Application No. 157550/1983. In the above application, a stepped inlet step is provided near the largest cross-sectional end of the first channel, and a number of stepped intermediate steps are provided on the downstream side of the first channel. The fluid was prevented from flowing toward the small cross-section side, so that a uniform water flow was generated in each of the third channels. Therefore, when manufacturing the heat collector of the above-mentioned invention, there remains a problem in that it is difficult to design and work the height pitch of the steps.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, provide a solar heat collector that can obtain a substantially uniform water flow over the entire heat collector, can prevent stagnation even if bubbles are generated, and is easy to manufacture. shall be.

In order to achieve the above object, the configuration of the present invention is formed inside a rectangular flat body having first sides, second sides, third sides, and fourth sides facing each other, and a first flow path along the second side, and a second flow path along the second side.
A flow path is connected to the first flow path and the second flow path, and a third flow path is connected to the first flow path and the second flow path.
one end is connected to the largest cross-sectional end of the first flow path, and the other end is connected to the maximum cross-sectional end of the first flow path, and a fourth flow path passing through the second side and serving as a cold water inlet; the cross-sectional area of the first flow path decreases from the upstream side to the downstream side;
In the flow path, the inner surface on the first side is linear along the first side, and the distance between the inner surface on the first side and the edge of the narrow strip seal portion is linear or stepped as it progresses from the upstream side to the downstream side. The boundary line between the narrow strip seal portion and the third flow path is a straight line, the boundary line between the first and second flow paths is arc-shaped, and the arc-shaped boundary line is narrowly defined by the third flow path. It is to intersect and continue to intersect with the straight line on the side, and to smoothly continue to the straight line on the fourth side.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, the solar heat collector is formed by blow molding two rectangular thin plates made of synthetic resin such as polypropylene or polyethylene, which are bonded together. When it is installed on a sloped roof surface for natural circulation or forced circulation, the right side 11 is the first side, the left side 12 is the second side, and the third side It has a lower side 13 which is a barrel, and an upper side 14 which is a fourth side. A first flow path 21 as a first header along the right side and a second flow path 22 as a second header along the left side are formed in the main body 10.

The first flow path 21 has an inner surface on the right side in a straight line parallel to the right side, and the cross-sectional area decreases from the upstream side to the downstream side (downward in the figure).

The second flow path 22 is formed point-symmetrically with respect to the first flow path 21 . That is, the left-side inner surface of the second flow path 22 is a straight line parallel to the left side, and the second flow path 22
The cross-sectional area of is expanded from the upstream side to the downstream side. A hot water outlet 22a penetrating the left side is provided on the downstream side of the second flow path 22.

The first flow path 21 and the second flow path 22 are connected to form a large number of parallel third flow paths 23 having a cocoon-shaped cross section through a narrow strip-shaped seal portion 32, as shown in FIGS. The third flow path 23 is provided so as to be inclined downstream by an angle B (B=1° to 5°) with respect to the outer edges of the lower side 13 and the upper side 14. However, this third flow path 2
Each of the flow paths 3 has a smaller cross section than the first and second flow paths 21 and 22, and is connected to the flow paths 23a and 23b through constricted portions 23a and 23b (FIG. 3).

The seal portion 30 is composed of a frame-shaped seal portion 31 forming the peripheral edge of the main body and the plurality of narrow strip-shaped seal portions 32, and the boundary line between the narrow strip-shaped seal portion 32 and the third flow path 23 is the lower side 13 and the upper side. It is formed by a long straight boundary line 32a along 14 and arcuate boundary lines 32b provided at both ends of the straight boundary line 32a. Therefore, the arc-shaped boundary line 32b continues so as to intersect with the straight line on the lower side 13 side of the linear boundary line 32a, and continues smoothly with the straight line on the upper side 14 side. Further, in this embodiment, the lengths of these many narrow strip-shaped seal portions 32 along the lower side 13 are the same. The end of the seal portion is formed such that the distance S from the inner surface on the right side in the first flow path 21 becomes linearly narrower as it progresses from the upstream side to the downstream side, and the inner surface on the left side in the second flow path 22. The distance S from the upstream side to the downstream side is formed so as to gradually widen in a straight line as it progresses from the upstream side to the downstream side.

On the inside of the upper side 14, there is an angle A with respect to the upper side 14.
The first flow path direction side is tilted downward while maintaining
A fourth flow path 24 is provided which is inclined at an angle C with respect to the third flow path. The fourth flow path 24 has one end connected to the largest cross-sectional end of the first flow path 21,
The other end passes through the left side 12 and serves as a cold water inlet 24a. A gap between the fourth flow path 24 and the third flow path 23 closest to the upper side 14 is reinforced as a seal portion 33.

The fourth flow path 24 has the same cross-sectional area on both the upstream and downstream sides, but the width of both flow paths is adjusted at the portion where the fourth flow path 24 connects to the first flow path 21 to avoid sudden cross-sectional changes. A chamfered portion 24b having a radius R approximately equal to is formed. Further, a drain outlet 11a is provided at the connection portion between the fourth flow path 24 and the first flow path 21.

The operating state will be explained above.

The cold water supplied into the heat collector from the cold water inlet 24a absorbs solar heat while passing through the heat collector, is heated, becomes hot water, and is sent out from the outlet 22a. The supply water is branched from the fourth flow path 24 through the first flow path 21 into a number of third flow paths 23 in the heat collector, reaches the second flow path 22, and joins again. In the first flow path 21, the water flow hits the inner wall surface of the chamfered portion 24b and is deflected, a part of which flows into one or more third flow paths 23 near the upper side 14, and other water flows into the first flow path 21. Most of the water flows down along the first flow path 21. Furthermore, a part of this flowing water flow collides with the end of the narrow band-shaped seal portion 32 arranged so that the flow path becomes gradually narrower, is changed direction, and sequentially flows into the remaining third flow path 23 . Since the first flow path 21 has a cross-sectional area that decreases as it progresses downstream,
Approximately equal amounts of water flow into each of the third flow paths 23.

At both ends of the third flow path 23, the narrow strip-shaped seal portions are sealed in a slightly wide arc shape, so they will not peel off during freezing or processing, and this arc-shaped boundary line 32b is only on the lower side. Since it is formed in a convex shape, even if air bubbles are generated, they are removed without accumulating in the constriction. Also,
Since the third flow path 23 has an angle B (1° to 5°) such that the downstream side is downward, the generated air bubbles are easily flowed down to the downstream side. Therefore,
Heat collection efficiency does not decrease due to air bubbles.

Further, the cross section of the third flow path is cocoon-shaped, and the drain outlet 11a is located near the inlet of the first flow path 21 on the first side 11.
Since this is provided, it is possible to drain water to avoid freezing, and at the same time, it is possible to absorb volume expansion due to freezing of water. The cross section of the third channel 23 is slightly enlarged from the upstream side to the downstream side, so that frozen ice can be easily removed by descending.

In addition, in the first flow path 21, the end of the narrow band-shaped seal part is set so that the distance from the inner surface on the right side becomes narrower in a stepwise manner as it progresses from the upstream side to the downstream side (that is, narrows for each complex seal part). It may be.

Setting the position of the end of the narrow strip-shaped seal part to a position where the flow path narrows in a stepwise or linear manner to a certain dimension is much easier to construct than providing multiple steps on the inner surface of the right side as proposed in the previous application. It has the advantage of being easy and having little dimensional error.

The cross-sectional area of the second flow path 22 on the downstream side does not necessarily need to be gradually increased with respect to the upstream side, and may be the same.

The solar heat collector of the present invention may be used with the right side 11 facing downward (the main body 10 is rotated 90 degrees clockwise in FIG. 1).

Since the present invention is constructed as described above, it is easy to manufacture, there are no dimensional errors, a substantially uniform water flow is obtained over the entire heat collector, and there is no accumulation of air bubbles in the container. Water flow is smooth. We were also able to demonstrate effects such as high heat collection efficiency.

In particular, the boundary line between the narrow strip seal portion and the third channel is a straight line, the boundary line between the first and second channels is arcuate, and the arcuate boundary line is on the third side. Since it intersects with the straight line and continues smoothly with the straight line on the fourth side, it will not peel off during freezing or processing, and this arc-shaped boundary line 3
2b is formed to have a convex shape only on the lower side, so even if bubbles are generated, they are removed without adhering to and accumulating at the constriction. This further improved heat collection efficiency.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and FIGS. 2 and 3 are enlarged sectional views - and - of FIG. 1, respectively. 10... Main body, 21... First channel, 22... Second channel, 23... Third channel, 24... Fourth channel,
22a...Hot water outlet, 24a...Cold water inlet, 30
... Seal part, 32a ... Straight boundary line, 32b
...Arc-shaped seal part.

Claims (1)

[Claims for Utility Model Registration] (1) The first side is formed inside a rectangular flat body having first and second sides facing each other, a third side which is the lower side, and a fourth side which is the upper side; first along the edge
a flow path, a second flow path along the second side, and the first
A large number of third channels which connect the flow channels and the second flow channels and are inclined at an angle B with respect to the third and fourth sides and are parallel to each other via narrow strip-shaped seal portions, and the maximum of the first flow channel A fourth side having one end connected to the cross-sectional end and the other end passing through the second side and serving as a cold water inlet.
The first flow path has a cross-sectional area that decreases from the upstream side to the downstream side, and the inner surface on the first side side is linear along the first side. The distance between the inner surface of one side and the end of the narrow strip-shaped seal portion is narrowed in a linear or step-like manner as it progresses from the upstream side to the downstream side, and the boundary line between the narrow strip-shaped seal portion and the third flow path is a straight line. The boundary line with the first and second flow paths has an arc shape, and the arc-shaped boundary line is continuous and intersects with the straight line on the third side, and is continuous with the straight line on the fourth side. A solar heat collector characterized by smooth continuity. (2) The cross section of the third channel is cocoon-shaped and slightly enlarged from the upstream side to the downstream side, and a drain outlet is provided near the inlet of the first channel on the first side. A solar heat collector according to claim 1 of the utility model registration claim, characterized in that: