JP2510114Y2 - Laminated heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a laminated heat exchanger, and to a small and highly efficient heat exchanger such as a helium refrigerator.

(Prior Art) Conventionally, as this type of heat exchanger, there is one disclosed in Japanese Utility Model Publication No. 63-50618 and shown in FIG. In FIG. 5, this is a material having a large thermal conductivity, for example,
A porous plate 1 made of aluminum for exchanging heat between the high temperature side fluid A and the low temperature side fluid B, and a spacer for separating the high temperature side fluid A and the low temperature side fluid B formed of a material having a small thermal conductivity, for example, plastic. It is manufactured by alternately laminating 2 and bonding or joining.

(Problems to be solved by the invention) However, in the above-described conventional heat exchanger, the arrangement of the perforated plates adjacent to each other via the spacer is irregular, or as shown in FIG. Therefore, the distribution of the flow rate on all the heat transfer surfaces of this heat exchanger is poor, and since the surface roughness of the perforated plate is particularly low, the heat exchange efficiency is not as good as expected and the pressure loss is large.

Therefore, the present invention aims to provide a laminated heat exchanger having a high heat exchange rate and a small pressure loss by making the flow rate distribution and the flow velocity as uniform as possible and effectively using the heat transfer area of the perforated plate. Subject.

[Constitution of device]

(Means for Solving the Problems) Means taken for solving the above technical problems are
In the laminated heat exchanger, the holes of each of the perforated plates have the same inter-hole pitch arrangement, and each of the perforated plates has one hole position of each hole of the adjacent perforated plates through the spacer. The holes of the perforated plate are arranged at equal intervals with respect to the nearest holes of the adjacent perforated plate, and the central axis of the holes of the perforated plate and the hole of the adjacent perforated plate are most adjacent to each other via a spacer. The distance between the central axes of nearby holes is substantially equal to the inner diameter of the holes.

The thickness of the perforated plate and the inner diameter of the holes and the thickness of the spacer are
It is desirable to have a ratio of approximately 4: 4: 1.

 Further, both end surfaces of all the holes of the perforated plate may be chamfered.

According to this, according to this, when the high temperature side fluid or the low temperature side fluid flows through each hole of the perforated plate at a certain flow velocity and flows out from this hole and into the hole of the adjacent perforated plate, a plurality of holes are formed. They are equally divided (three equally divided in the embodiment described later) and flow into each, and the flow rates of all the holes are substantially equal. Further, in this process, since the cross-sectional area of the hole and the cross-sectional area of the spacer formed by the diameter of the hole are substantially equal to each other, the flow velocity is hardly changed and the flow rate distribution is substantially uniform. Therefore, the high temperature side fluid and the low temperature side fluid pass through all the holes of the perforated plate and the gap formed by the spacers with a substantially uniform flow velocity and flow rate distribution, so that all the heat transfer surfaces effectively contribute to heat transfer and heat exchange. The efficiency can be improved and the pressure loss can be reduced. Further, if both ends of all the holes are chamfered smoothly, the pressure loss can be further reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, a material having a large thermal conductivity,
For example, the perforated plates 1a and 1b having a thickness of 4 mm, which are made of copper and exchange heat between the high temperature side fluid A and the low temperature side fluid B, are the high temperature side fluid A.
And the low temperature side fluid B are separated, and they are alternately laminated with a gap of 1.25 mm via a spacer 2 made of a material having a small thermal conductivity, for example, stainless steel. Spacer 2 is perforated plate 1
Adhered or bonded to a, 1b, and perforated plates 1a, 1b
Both ends of the holes 3a and 3b are chamfered by etching or the like.

As shown in FIG. 3 and FIG. 4, each hole 3 of the perforated plates 1a, 1b
a and 3b have the same hole pitch arrangement, and each hole 3a of the perforated plate 1a
As shown in Fig. 3, the distance between the central axes of the holes 3 of the perforated plate 1b
It is the same as the distance between the central axes of a, 3b, and 3c, and this distance is set to 5 mm, which is equivalent to the diameter of each hole. Further, in the perforated plate 1a, the positions of the holes 3b of the perforated plates 1b adjacent to each other via the spacer 2 are the three holes 3b1 and 3b2 of the perforated plate 1b which are adjacent to the holes 3a of the one perforated plate 1a. , 3b3 are arranged at equal intervals.

In this embodiment having the above structure, the high temperature side fluid A or the low temperature side fluid B flows through each hole 3a of the perforated plate 1a at a certain flow velocity and flows out from this hole 1a to the hole 3b of the adjacent perforated plate 1b. When it flows in, it is divided into three equal parts, each of which flows in, which hole 3b1,3b
2,3b3 flows almost equally. Further, in this process, since the cross-sectional area of the hole 3a and the cross-sectional area of the spacer 2 formed by the diameter of the hole 3a are substantially equal to each other, the flow velocity hardly changes and the flow rate distribution flows substantially evenly. . Therefore, since the high temperature side fluid A and the low temperature side fluid B pass through all the holes of the perforated plates 1a and 1b and the gap formed by the spacer 2 with a substantially uniform flow velocity and flow rate distribution, all the heat transfer surfaces are effectively heated. It is possible to contribute to the transfer, improve the heat exchange efficiency, and reduce the pressure loss. Further, since both ends of all the holes are smoothly chamfered, the pressure loss can be further reduced.

Although the porous plates 1a and 1b have been described in the above-described embodiments, the number of the porous plates may be any number, that is, adjacent porous plates have their holes having the same hole pitch arrangement. Then, the positions of the holes of the perforated plates that are adjacent to each other through the spacers are such that the holes of one of the perforated plates are evenly spaced from the nearest holes of the adjacent perforated plate. If the distance between the center axis of the hole of the perforated plate and the center axis of the hole closest to the hole of the perforated plate adjacent to each other via the spacer is substantially equal to the inner diameter of the hole, good.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of a laminated heat exchanger according to the present invention, FIG. 2 is a vertical cross-sectional view of FIG. 1, and FIG. 3 is a flow of a high temperature side fluid and a low temperature side fluid. FIG. 4 is a partially enlarged cross-sectional view showing the structure of the passage, FIG. 4 is a vertical cross-sectional view of FIG. 3, and FIG. 5 is a partial vertical cross-sectional view of a conventional laminated heat exchanger. 1a, 1b ... perforated plate, 2 ... spacer, 3a, 3b, 3b1,3b2,3b3
...... Hole, A ... High temperature side fluid, B ... Low temperature side fluid.

Claims (1)

(57) [Scope of utility model registration request] 1. A laminated heat exchanger in which a porous plate for exchanging heat between a high temperature side fluid and a low temperature side fluid and a spacer for separating the high temperature side fluid and the low temperature side fluid are alternately laminated, The holes of the perforated plates form the same inter-hole pitch arrangement, and the perforated plates have the respective hole positions of the holes of the respective perforated plates which are adjacent to each other through the spacer, and the respective holes of one of the perforated plates are adjacent to it. Arranged at equal intervals to the closest plurality of holes of the perforated plate, of the holes closest to the central axis of the holes of the perforated plate and the holes of the perforated plates adjacent to each other via the spacer. A laminated heat exchanger characterized in that the distance between the central axes is substantially equal to the inner diameter of the hole.