JP2509195Y2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention is a cross-flow type having a core portion composed of a tube and a corrugated fin, header pipes on both sides thereof, and a connecting member fitted vertically to the header pipe. Regarding heat exchangers.

2. Description of the Related Art As a heat exchanger of this type, FIG. 6 of the present applicant's application (Japanese Patent Application No. 1-28061) (only the main part is shown corresponding to FIG. 2 showing the present invention) The ones shown in (1) have been developed in recent years.

This heat exchanger consists of a pair of header pipes 03 on both sides of the core part consisting of many tubes 01 and corrugated fins 02.
The connecting members 04 are arranged in the vertical direction, and the ends of the tubes 01 are inserted and fixed in the header pipe 03, and both ends of the connecting members 04 are fitted to the upper and lower portions of the header pipe 03. Integrally fixed, inflow header pipe
The upper part 03a of 03 is closed (Fig. 6), and this header pipe 0
It is a cross-flow type in which a refrigerant (cooling water) flows in from the lower end of 3 and passes through the inside of the core portion, then flows out from the lower end of the other header pipe (not shown) and recirculates.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-mentioned prior art, since both ends of the connecting member are fitted to the pair of header pipes, the rigidity of the entire heat exchanger is high and the durability can be improved. I can, but
No special consideration was given to the relationship between the tube level and the block part provided at the upper part of the header pipe on the cooling water inflow side, and there was a space part between the block part and the uppermost tube upper surface. As a result, an air pool is generated in this part, and the air that has accumulated in this part or the air that has been separated from the cooling water flows into the cooling water when the cooling water flows into the uppermost tube from the top of the header pipe. It is mixed as air bubbles (aeration) and circulates together with the cooling water.

When air bubbles are mixed in the cooling water and circulated in this way, there is a problem that cooling efficiency is reduced.

In addition, such bubble circulation also causes corrosion of the inner surface of the tube when the bubbles disappear, which adversely affects the durability of the heat exchanger.

The present invention is intended to provide a heat exchanger that eliminates such a problem and improves cooling efficiency and durability.

Means and Actions for Solving the Problems In accordance with the above-mentioned object, the present invention has a core portion composed of a plurality of tubes arranged in parallel and corrugated fins fixed between them. The header on the inflow side has a pair of header pipes that insert and fix the tips of the refrigerant pipes and form a refrigerant inlet / outlet, and a connecting member whose both ends are fitted to the header pipes so as to sandwich the core portion from above and below. This is a cross-flow heat exchanger in which the plug plate is installed in the upper part of the pipe so that the lower surface of the plug plate is at the same level as the upper surface of the uppermost tube. A corrugated fin is inserted between the upper tube and the header pipe directly above the plug plate with small holes. The refrigerant that has entered passes through many tubes and flows back to the header pipe on the outflow side, but the upper part of the header pipe on the inflow side is blocked at the same level as the uppermost tube, so there is an air pool in the header pipe. Does not happen. Therefore, air can be prevented from being mixed into the cooling water, and heat exchange can be performed in the core portion without lowering heat dissipation.

Further, in the case where a small hole is provided in the upper part of the header pipe, it is effective for discharging the pool of water and rainwater spilled at the time of injection and other foreign matter through this hole.

Embodiment FIG. 1 and FIG. 2 show a first embodiment according to the present invention, which will be described with reference to the drawings.

1 is a cross-flow heat exchanger attached to the vehicle,
A large number of flat metal tubes 2 are arranged in parallel, and corrugated fins 3 are inserted between them to form a core portion 4.

An inflow side header pipe 5 and an outflow side header pipe 6 are arranged on both sides of the core portion 4, and each header pipe 5,
6 is provided with a tip insertion port 7 of the tube 2 along the longitudinal direction, and a cooling water inflow port 12 as a cooling medium is provided at the lower end of the inflow header pipe 5 at the lower end of the outflow header pipe 6. The outlets 13 are formed respectively.

Further, an upper connecting plate 8 and a lower connecting plate 9 made of metal, which are formed by press working as shown in FIG. 3, are arranged on the upper and lower surfaces of the core part 4, and the connecting plates 8 and 9 are provided at both ends. A header pipe insertion port 10 is provided, and a mounting piece 11 for mounting the heat exchanger 1 on a vehicle or the like is formed integrally or separately on the entire surfaces of these connecting plates 8 and 9.

Then, the left and right ends of the tube 2 are inserted into the tube insertion ports 7 of the pair of header pipes 5 and 6,
The corrugated fins 3 are fitted between them, and the upper and lower connecting plates 8 and 9 are fitted into the header pipes 5 and 6 so as to contact the tubes 2 at both ends and hold the core portion 4 therebetween. The brazing material, which is carried into the brazing heating furnace and coated on the surface thereof, is melted and integrally joined.

At the same time, the plug plate 14 previously fitted and assembled on the upper end of the inflow header pipe 5 is also fixed in a watertight manner at the position where the lower surface 14a thereof abuts the upper surface of the uppermost tube 2 (FIG. 2). .

A filler neck 16 having an overflow pipe 15 is brazed to the upper end of the outflow header pipe 6, and the pressure cap 17 is attached to the filler neck 16.
Is inserted, and when the pressure exceeds a predetermined value, the cooling water flows out from the overflow pipe 15.

Further, the inlet 12 and the outlet 1 of both header pipes 5 and 6
Hoses 18 and 19 connected to an engine (not shown) are respectively fitted to 3 so that the cooling water discharged from the engine is returned to the engine via the heat exchanger 1.

Since this embodiment is configured as described above, the cooling water heated by the engine and having a high temperature flows into the inflow header pipe 5 through the inflow hose 18 and passes through the many tubes 2. Is sent to the outflow side header pipe 6 and returned to the engine through the outflow hose 19.
During this time, the cooling water is cooled by the air sent to the core portion 4 including the corrugated fins 3 and the tubes 2.

Although the cooling water is used as the cooling medium, it is possible to use a cooling medium other than water.

Next, an embodiment according to the invention of claim (2) shown in FIG. 4 will be described.

In this embodiment, the corrugated fins 3 are arranged on the upper surface of the uppermost tube 2, and the connecting plate 8 is provided thereon. That is, the corrugated fins 3 are interposed between the upper connecting plate 8 and the uppermost tube 2.

The plug plate 14 is attached to the inflow header pipe 5
Is inserted from above, and is fixed in a water-tight manner at the position where the lower surface 14a thereof abuts the upper surface of the uppermost tube 2 as in the above-described embodiment. A cutout hole may be provided on the side surface of the header pipe 5, and the plug plate 14 may be mounted in the pipe through the cutout hole.

With this structure, in this embodiment, the concave chamber 20 having the plug plate 14 as the bottom is formed in the upper portion of the pipe. And the water and rainwater spilled during injection into this chamber 20,
In order to prevent the accumulation of other foreign matter, a small hole 21 is provided in the header pipe 5 immediately above the plug plate 14 so that water or the like in the chamber 20 can be discharged.

Effect of the Invention According to the present invention, the plug plate is installed in the upper part of the header pipe so that the lower surface of the plug plate is at the same level as the upper surface of the uppermost tube, and there is a space above the inflow side header pipe. Therefore, no air pool is generated in the flow path of the refrigerant.

As a result, according to the present invention, air bubbles do not mix during circulation of the refrigerant, and it is possible to prevent deterioration of heat dissipation due to air bubbles mixed in the refrigerant. Furthermore, since there is no mixture of air bubbles, it is possible to prevent erosion of the inner surface of the tube,
The durability of the heat exchanger can be improved.

Further, in the heat exchanger according to claim (2), since the corrugated fins are interposed between the upper connecting member and the uppermost tube, the core portion and the like can be freely designed according to various conditions. The degree can be increased, and the overall structure can be made compact.

And, since a small hole is provided in the concave chamber formed in the upper portion of the header pipe by the above configuration, water,
In addition, foreign matter does not collect and the room is kept clean.

[Brief description of drawings]

FIG. 1 is a front view of a heat exchanger according to the present invention, FIG. 2 is a sectional view of an essential part thereof, FIG. 3 is an enlarged perspective view of an essential part of an upper connecting plate, and FIGS. 4 and 5 show other embodiments. FIG. 4 is a sectional view of an essential part, FIG. 5 is a side view of the same, and FIG. 6 is a sectional view of an essential part of a conventional heat exchanger. 1 ... Heat exchanger, 2 ... Tube, 3 ... Corrugated fin, 4 ... Core part, 5, 6 ... Header pipe, 7 ...
Tube insertion port, 8 ... Upper connection plate, 9 ... Lower connection plate, 10 ... Header pipe insertion port, 11 ... Mounting piece, 12 ...
… Inlet, 13 …… Outlet, 14 …… Plug plate, 15…
… Overflow pipe, 16… Filler neck, 17…
… Pressure cap, 18,19 …… Hose, 20 ……
Chamber, 21 ... small hole.

Claims (2)

(57) [Scope of utility model registration request] 1. A core portion composed of a large number of tubes arranged in parallel and corrugated fins fixed between them, positioned on both sides of the core portion, the tips of the tubes are inserted and fixed, and a refrigerant inlet / outlet is formed. A pair of header pipes,
In addition, it has a connecting member whose both ends are fitted to the header pipe so as to sandwich the core part from above and below, and the lower surface of the plug plate is at the same level as the upper surface of the uppermost tube in the upper part in the header pipe on the inflow side. A cross-flow heat exchanger with a plug plate attached so that 2. The cross according to claim 1, wherein corrugated fins are interposed between the upper connecting plate and the uppermost tube, and a small hole is provided in the header pipe immediately above the plug plate. Flow type heat exchanger.