JPH0232116Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchange unit for a vehicle seat, and more particularly to a flow path for a heat medium.

Recently, it has been proposed to incorporate a heat exchange unit into a vehicle seat to obtain a heat retaining effect during riding. As shown in FIGS. 1 to 3, this heat exchange unit 1 is provided in a seat cushion part 2 or a seat back part 3, and has a tank (not shown) for sending a heat medium through an inflow pipe 4 and an outflow pipe 5. It is connected to the. Heat exchange unit 1 is 2
It is made by stacking two soft synthetic resin sheets 6 and 7 and welding the parts other than the flow path 8 by high frequency heating or the like. A heat medium that heats the liquid from the tank flows through the hollow space between the welded parts 9, 9, that is, the flow path 8. However, conventionally, this flow path is composed of one flow path 8 from the inflow pipe 4 to the outflow pipe 5, and is in a series state, so if a part of the flow path is blocked by the body weight, the heat transfer medium is completely removed. There was a drawback that the flow stopped and the heat exchange efficiency was reduced. In addition, the blocked flow overloads the pump, causing seizure and power loss. In contrast, a heat exchange unit 10 in which the structure of the flow passages is changed as shown in FIGS. 4 to 6 has been proposed (not yet known). This heat exchange unit 10 consists of a base portion 14 made up of two layers of a first sheet 11 and a second sheet 12 made of soft synthetic resin sheets, and a strip portion 13 obtained by providing parallel slits. base 14
A third sheet 15 is further welded to the top. Base 14 between first sheet 11 and second sheet 12
An inflow trunk channel 17 connected to the inflow pipe 16 is formed to extend perpendicularly to the strip portion 13 . An outflow main channel 1 connected to an outflow pipe 18 is provided at the base 14 between the second sheet 12 and the third sheet 15.
9 is formed. A U-shaped branch outflow path 21 is formed in each strip portion 13 between the first sheet 11 and the second sheet 12, one end of each trunk flow path 21 is connected to the inflow trunk flow path 17, and the other end is connected to the inflow trunk flow path 17. It is connected to the outflow trunk channel 19 via the hole 20 . The above outflow hole 20
is provided on the second sheet at a position corresponding to the outflow trunk flow path 19. The heat medium flows from the inflow pipe 16 to the inflow trunk flow path 17, the branch flow path 21, the outflow hole 20, and the outflow trunk flow path 1.
9 into the outflow pipe 18 . As a result, even if one of the branch channels 21 is blocked, the flow of the heat medium is blocked only in that branch channel 21, and the heat medium flows through the remaining branch channels 21, so that heat exchange can be performed effectively. be exposed. However, in such a configuration, as shown in FIG. 6, there is a portion 23 where one inflow side 22 of the branch flow path 21 and the outflow main flow path 19 intersect with the second sheet 12 in between, so that the heat medium When the pressure is large, the second sheet on the inflow side 22 bulges in the direction of the outflow trunk flow path 19, resulting in a drawback that the heat medium in the outflow trunk flow path 19 cannot flow smoothly.

Therefore, the purpose of the present invention is to provide a heat exchange unit which is formed by overlapping sheets to form a flow path therein, with an inflow trunk flow path, an outflow trunk flow path, and a branch flow path branching from the inflow trunk flow path into an outflow trunk flow path. The above drawbacks are solved by forming an intermediate plate between the intersecting branch channels and the outflow main channel.The present invention will be explained in detail below based on examples.

FIG. 7 is a partial sectional view showing an embodiment of the heat exchange unit of the present invention, and in this figure, the same parts as in FIGS. 4 to 6 are designated by the same reference numerals. An intermediate plate 24 made of a slightly hard synthetic resin sheet is fixed to the lower side of the third sheet 15 on the second sheet 12 . An opening having the same size as the outflow hole 20 is formed in a portion of the intermediate plate 24 corresponding to the outflow hole 20, so that the heat medium can flow out from the outflow hole 20 through the outflow main channel 19.

According to the above configuration, when the heat medium passes through the inflow side 22 at the intersection 23 of the branch flow path 21 from the inflow pipe 16, the second sheet 12 on the inflow side 22 is
3 prevents it from expanding toward the outflow trunk flow path 19 side. Thereby, the heat medium flows smoothly in the outflow trunk flow path 19.

As explained above, in the present invention, by fixing the intermediate plate between the mutually intersecting flow channels, the heat medium flows smoothly in the outflow trunk flow channel. Therefore, there is no possibility that the heat exchange efficiency will decrease.

[Brief explanation of the drawing]

1 to 3 are simplified perspective views of a conventional heat exchange unit, FIGS. 4 to 6 are perspective views and sectional views of an unknown heat exchange unit, and FIG. 7 is a simplified perspective view of a conventional heat exchange unit. FIG. 3 is a partial cross-sectional view of the heat exchange unit. 11...First sheet, 12...Second sheet, 1
5... Third sheet, 16... Inflow pipe, 17... Inflow trunk channel, 18... Outflow pipe, 19... Outflow trunk channel, 20... Outflow hole, 21... Branch channel, 22...
...Inflow side, 24...Intermediate plate.

Claims (1)

[Scope of utility model registration request] A heat exchange unit that forms a flow path between a first sheet and a second sheet that are joined to each other and between a second sheet and a third sheet that are joined to each other, and maintains heat by flowing a heat medium through the flow path. A flow path formed between the first sheet and the second sheet, and a flow path formed between the second sheet and the third sheet.
1. A heat exchange unit for a vehicle seat, characterized in that a plate material is interposed between a second sheet and a third sheet at a portion where a flow path formed between the second sheet and the third sheet intersects.