JPS5932850Y2 - Multi-plate heat exchanger - Google Patents

Description

[Detailed description of the invention] The present invention relates to a multi-plate heat exchanger, which suppresses the cooling water in the heat exchange chamber from passing through areas other than the laminated intervals of the tubes, and heats up while minimizing the increase in resistance of the cooling water. This is intended to improve exchange efficiency.

Sand castings or die castings are usually used for the housing of multi-plate heat exchangers.

When molding molten metal in this way, a draft angle of the mold is required, so the inner surface of the side wall becomes an inclined surface that expands toward the open end.

In addition, the dimensional accuracy and surface roughness are relatively poor, so the distance between the element and the inner surface of the housing must be made larger than a desired value.

FIG. 1 is a partial sectional view showing a conventional multi-plate heat exchanger 2 in which an element 4 is housed in a housing 3 molded as described above and a heat exchange chamber 11 is formed, and FIG. The tube 10 constituting the element 4 is stacked on the flange 9 at right angles, but since the inner side wall 6.6' of the housing 3 is inclined, the inner side wall 6,6' and long edge 13 and short edge 1 of element 4
The space at 4 is the maximum distance M and L at the open end 5.
It becomes.

Furthermore, there is a gap 1' (a third
Figure) exists.

Therefore, a high proportion of the cooling water flows straight through the intervals M and l' with low resistance and does not come into contact with the surface of the tube 10, resulting in a heat exchanger with low heat exchange efficiency.

However, if these gaps M and l' are closed over the entire length of the element length Q, there is a drawback that the passage resistance of the cooling water becomes high.

In particular, the resistance increases significantly when the connection between the spacing and M, l', through which the water flow changes direction, is occluded.

The present invention was developed in view of the above, and provides a multi-plate heat exchanger that minimizes the increase in resistance of cooling water and has excellent heat exchange efficiency without changing the shape of the housing and elements. It is something to do.

Embodiments of the present invention will be described below with reference to the drawings. Fig. 3 shows the multi-plate heat exchanger 1 of the present invention, in which the housing 3 is sectioned along the direction from upstream to downstream of the cooling water, and Fig. 4 is a sectional view taken along arrow BB in Fig. 3. be.

The housing 3 has an open end 5 that is large enough to accommodate an element 4, which will be described later, and a side wall inner surface 6 that takes into consideration the draft angle of the mold.
, 6', and a cooling water outlet 8 is provided on one side wall and a cooling water outlet 8 on the other side wall.

The element 4 is composed of a plurality of tubes 10 stacked and integrally fixed to one plane of a flange 9, and the open end 5 is removably closed by a flat flange 9 to form a heat exchange chamber 11.

12 is a short tube arranged at both ends of the tube 10, and holds the tube 10 at equal intervals l, and its inside forms a concentration path for the fluid to be cooled, and the inlet/outlet provided in the flange 9 and the flow path in the tube 10 are connected to each other. It is something that communicates.

L and M are the same spacing as in the conventional one described above, 13 indicates the long edge of the element, 14 indicates the short edge, and l' is provided between the inner surface of the top wall 15 and the flat part 16 of the tube. The margin interval is larger than the interval l.

The baffle 17 has a width P smaller than the length Q of the long side edge of the element 4, is provided in a hollow shape between the long side edge 13 and flat part 16 of the element 4, and the inner surface of the housing 3, and has a long side edge length Q. It is located approximately at the center of the portion 13 and is fixed by a stopper 18 provided on the flat portion 16, thereby closing the distance M, l' by the portion occupied by the width P.

The width P, length Q and interval M of the baffle 17 are P≦Q4M
The relationship is as follows.

According to experiments, when the flow direction changes at the contact area between the spacing M and M, the resistance increases significantly when the baffle 17 reduces the cross section of the waterway, but from the contact area between the spacing M and L. This is because if there is a distance of about 2M to the end face of the width P of the baffle 17, this resistance will be significantly alleviated, and the same is true on the exit side.

FIG. 5 is a plan view of the tube 10 taken along the line E-E in FIG. 3.
FIG.

Note that the baffle 17 used in this example has an interval of M, l'
Since a swellable water-absorbing polymer, such as polyvinyl formal, which is compression-molded to a thinner thickness is used, when moistened with cooling water, it expands in the opposite direction to the compression direction and adheres tightly to the inner surface of the side wall 6 and the inner surface of the top wall 15. do.

Therefore, it can be more easily and reliably adhered to the draft angle or rough surface of the inner surface of the housing than by matching the shape with a metal material.

Since this device uses the above-mentioned configuration, the cooling water that is traveling straight along the inner surface of the side wall 6 and the inner surface of the top wall 15 at intervals M and l' is blocked by the baffle 17 and becomes a meandering flow.
It merges with the cooling water that has been traveling straight through the distance l from the beginning at the width P and heads toward the outlet 8.

As described above, in the present invention, since a part of the distances M and l' are reduced by the baffle, all of the cooling water passes through the stacked tube spacing in the area where the baffle is provided (width P). The combined cooling water flows in direct contact with the tube, creating a cooling effect.

Also, the distance M before and after the width P of the baffle. The portion l' is not blocked by a baffle, but is connected to a spaced portion communicating with the cooling water inlet and outlet, separated by a distance of 2M from each end of the baffle, so that the cooling water is not blocked. When the cooling water enters from the inlet and diffuses at intervals, it is guided to spread over the entire area within the housing (B-B cross section), which has the effect of lowering the resistance.

Also, the direction change toward the exit can be easily performed near the end of the element.

Therefore, not only is the resistance lower than that in which the intervals M and l' are closed over the entire length Q, but even if the cross section of the water channel is reduced in the width P part, the connection with the interval part where the cooling water changes direction is possible. Since the intervals M and l' are not occluded in the part,
The increase in resistance of the cooling water can be kept to a minimum.

[Brief explanation of the drawing]

Figure 1 shows a conventional multi-plate heat exchanger with a partial cross-section of the housing. FIG. 2 is a sectional view taken along the line A-A in FIG. Figure 3 shows the multi-plate heat exchanger of the present invention, with the housing partially cut away. FIG. 4 is a sectional view taken along the line B--B in FIG. 3. FIG. 5 is a sectional view taken along the line EE in FIG. 2...Multi-plate heat exchanger, 3...Housing, 4...Element, 6...Inner surface of side wall, 9...Flange, 10...tube, 11...heat exchange chamber, 12...short tube, 13...long edge, 15...top Wall inner surface, 16... Flat part, 17... Baffle, P... Width, Q... Long edge length, M, l'... ····interval.

Claims (1)

[Scope of utility model registration request] A heat exchange chamber is formed by accommodating an element in which the tube is laminated in multiple stages on a flat flange in a housing via short tubes disposed at both ends of the tube, and closing the open end of the housing with the flange. In a heat exchanger in which cooling water flows in the long side direction of an element in a housing, 1, the distance M between the long side outer surface of the element and the inner surface of the side wall of the housing, and the distance l' between the inner surface of the top wall of the housing, and the width P. A U-shaped baffle is provided approximately in the center of the length Q so that P≦Q-4
M, and a multi-plate heat exchanger in which only the width P portion is closed at intervals M and l'.