JPH064224Y2 - Plate heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a plate heat exchanger mounted in a lubricating system of an internal combustion engine, for example.

[Conventional technology]

The plate heat exchanger of the present invention is formed by stacking a large number of plates, and is of a type called housingless or caseless. A conventional plate-type heat exchanger, as shown in the specification of Japanese Utility Model Publication No. 61-144378, stacks a large number of disc-shaped plates provided with cooling water inlet / outlet holes and lubricating oil slot openings. In the meantime, the cooling water flow path and the lubricating oil flow path are liquid-tightly isolated from each other. A cover communicating with the cooling water passage is attached to the upper plate, and the cover is fixed to the upper surface of the plate. An inlet / outlet pipe for cooling water is connected to the cover (Fig. 6).

Cooling water flows into the cover through the inlet pipe, flows through the cooling water channel between the plates, returns into the cover, and flows out through the outlet pipe. The lubricating oil flows into the lubricating oil passage between the plates from the slot opening of the lower plate, and then flows out to the slot opening of the upper plate as it is. During this time, the cooling water and the lubricating oil exchange heat with each other. The plate may have a disk-like shape having four or eight concentric openings as shown in JP-A-61-223213.

[Problems to be solved by the invention]

Since the cooling water passage and the lubricating oil passage are formed between the plates, the heat exchanger having such a structure requires a compartment discharge means for separately taking out the cooling water and the lubricating oil. The compartment discharging means is provided on the upper plate from the viewpoint of space saving. In the conventional example, an annular cover is provided, the inside of which is communicated with the cooling water passage and the outside of which is communicated with the lubricating oil passage to partition the two. However, if the fixed seal at the inner bottom of the annular cover is insufficient, the cooling water and the lubricating oil will mix. Further, the cover and the plate are fixed to each other by brazing. However, since the cooling water flows through the cover, the brazing material may be corroded, and a gap may be formed between the brazing material and a sealing failure.

[Means for solving problems]

A reinforcing partition plate having a bulge portion at the center and two openings around the bulge portion is fixed to the upper end surface of the heat exchange element in which a large number of plates are stacked and the chambers A and B are formed between them. A connecting pipe was connected to each opening to form a structure.

[Action]

The cooling water that emerges at the upper end surface of the heat exchange element immediately flows out through the connecting pipe, while the lubricating oil flows into the bulging portion. Therefore, unlike the case where a chamber for cooling water and lubricating oil is formed in the upper end surface and each of them is partitioned to take out cooling water and lubricating oil, the number of partition joints does not become large and the seal is damaged. Opportunities are reduced.

〔Example〕

1 to 5 show a plate heat exchanger 10 of the present invention, which includes a heat exchange element 11, a reinforcing partition plate 12, and a connecting pipe 13.
Are integrated. The heat exchange element 11 has a central hole 14
Has four flow ports 15a, 15b, 15 at equal intervals around it.
A large number of disk-shaped plates 16 provided with c and 15d are stacked. Annular flanges 17 and 18 are formed on the center hole 14 and the outermost periphery of the plate 16, and annular flanges 19 and 20 are also provided on the pair of circulation ports 15a and 15c. Reference numeral 21 is a protrusion, and 22 and 23 are upper and lower plates.
The upper plate 22 has a central opening and three openings around it, and the lower plate 23 has one opening around the central opening. The plates 16 are sequentially stacked by 90 °, and two chambers A and B partitioned by each other are formed therebetween.

The upper plate 22 of the heat exchange element 11 has a bulge in the center.
A reinforcing partition plate 12 having an opening 26 and having two openings 24, 24a around it is fixed. The bulging portion 26 is provided with a through hole 27 for inserting a mounting bolt. Opening of the reinforcing partition plate 12
24 and 24a respectively communicate with two of the three openings of the upper plate 22. Inside the bulging portion 26, the remaining opening of the upper plate 22 and the central opening of the upper plate 22 are in communication with each other.

The connecting pipes 13 and 13 are connected to the openings 24 and 24a of the reinforcing partition plate 12. The connecting pipe 13 has an annular bead 28 near one end.
When inserted into the openings 24, 24a of the reinforcing partition plate 12, the annular beads 28 are placed on the edges of the openings 24, 24a (Fig. 3).

The plate heat exchanger thus assembled is integrally fixed. A brazing material is supplied to each joint, or a brazing material such as copper is plated on each plate and brazing is performed in a furnace after assembling to obtain an integral one.

Mounting bolts are inserted into the through holes 27 of the reinforcing partition plate 12, and the plate heat exchanger is fixed to the internal combustion engine for use. The through hole 27 is sealed by the upper end of the bolt.

The chamber A of the heat exchange element 11 has an opening 24 in the reinforcing partition plate 12,
The chamber B communicates with the upper plate 22 which is located below the openings around the central opening of the lower plate 23 and the reinforcing partition plate 12.
Communicating with the opening 25. The cooling water is introduced from one of the connecting pipes 13, flows in the chamber A, and flows out to the other connecting pipe 13. Lubricating oil is introduced from an opening around the central opening of the lower plate 23, flows through the chamber B, flows toward the opening 25 of the upper plate 22 on the lower side of the reinforcing partition plate 12, and expands from there. It reaches within the outlet 26. During this time, the cooling water and the lubricating oil exchange heat with each other.

〔effect〕

The plate heat exchanger of the present invention is provided with a reinforcing partition plate and an opening of the partition plate for partitioning the lubricating oil outflow passage and the cooling water outflow passage at the upper end of the heat exchange element.
Since the connecting pipe is fixed, the lubricating oil and the cooling water are effectively partitioned, and the sealing property is good.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a partially enlarged view of FIG. 1, FIG. 4 is a heat exchange element sectional view, and FIG. The figure is a plan view of the plate.
FIG. 6 is a cross-sectional view of a conventional heat exchanger. 11 ... Heat exchange element, 12 ... Reinforcement partition plate 13 ... Connection pipe, 24, 24a, 25 ... Opening 26 ... Swelling part

Claims (1)

[Scope of utility model registration request] 1. A plurality of plates are stacked and chambers A and B are provided between them.
On the upper surface of the heat exchange element having two openings that communicate with the chamber A and one opening that communicates with the chamber B on the upper surface of the heat exchange element The reinforcing partition plate provided with is fixed, the openings are communicated with two openings communicating with the chamber A of the element, and the connection pipes are connected with these openings, and the openings communicating with the chamber B are formed in the bulging portion. Plate heat exchanger located at.