JPS643994Y2 - - Google Patents

Description

[Detailed description of the invention] a. Purpose of the invention (industrial application field) The heat exchanger according to this invention is used as a radiator for cooling water heat radiation of automobile engines, or as a heat exchanger for high-temperature steam generated from various heat equipment. It can be used as a condenser to cool and condense water.

(Prior Art) For example, a heat exchanger as shown in FIG. 4 is used as a radiator for dissipating heat from engine cooling water. This heat exchanger has tanks 5a and 5b fixed via seat plates 4 and 4 above and below a core part 3 consisting of a large number of heat transfer tubes 1 and fins 2 and 2, respectively. When dissipating heat from cooling water, the cooling water is sent through the inlet pipe 6 provided in the upper tank 5a and discharged from the outlet pipe 7 provided in the lower tank 5b. While flowing down from the upper tank 5a to the lower tank 5b in the inside of the core part 3, heat exchange is performed between the core part 3 and the air flowing in the front and back directions of the drawing, heat is radiated, and the temperature is lowered.

(Problems to be solved by the invention) By the way, in a heat exchanger constructed and operated as described above, conventionally, the ends of each heat transfer tube penetrated through the seat plate 4 made of metal or synthetic resin in a liquid-tight manner. Since the portion slightly protruded from the surface of the seat plate 4, the following inconvenience occurred. That is, if the lower end of each heat exchanger tube 1, 1 protrudes below the lower surface of the lower seat plate 4 as shown in FIG. The air bubbles accumulated in the space having a height H between the lower surface of the seat plate and the lower end edge of the liquid passage pipe. If the air accumulated in the upper space of the lower tank 5b is sent out from the outlet pipe 7 due to vibrations when the vehicle is running, the water pump may be prone to cavitation, or the engine water jet may become susceptible to cavitation. It causes extreme overheating in the butt.

In order to eliminate this inconvenience, a plate-shaped spacer having a large number of openings that align with the lower end of each heat exchanger tube 1, 1 is attached to the lower surface of the seat plate, and the lower surface of this spacer is attached to the lower surface of each heat exchanger tube 1, 1. The device is located below the lower edge of the heat exchanger tube 5b so that the air flowing into the lower tank 5b is returned to the inside of the heat exchanger tubes 1, 1.
No. 58-186986 (see Japanese Utility Model Application Publication No. 60-95476). For example, as shown in FIG. 6, a spacer 8 made of synthetic resin or the like is sandwiched between a seat plate 4 and a tank 5b, or as shown in FIG. The outward flanges 9, 9 formed at the lower ends of the holder are sandwiched between a seat plate 4 made of synthetic resin and a spacer 8, as shown in FIG.

However, in the case of the heat exchanger according to the prior invention configured in this way, the entire heat exchanger is installed in an inclined position, or in the case of an on-vehicle heat exchanger, when the car is driven on a slope. , it was unavoidable that air would accumulate in the corners of the lower surface of the spacer 8. Furthermore, since each heat exchanger tube 1, 1 has a small cross-sectional area and the fluid flows continuously down inside, the air that has once flowed into the lower tank 5b flows back into the heat exchanger tube 1, 1.
It's hard to go back inside.

The heat exchanger of the present invention takes into account the above-mentioned circumstances,
This allows the air that has flowed into the lower tank to be efficiently discharged regardless of the state of the heat exchanger.

b. Structure of the invention (means for solving the problem) The heat exchanger of the invention, like the heat exchanger of the previous invention mentioned above, has a seat plate installed on the lower surface of the seat plate provided below the core part. A spacer having a number of openings aligned with the lower end of the heat transfer tube that penetrates the heat exchanger tube in a liquid-tight manner is attached.

In the heat exchanger of the present invention, the lower surface of the spacer attached to the lower surface of the seat plate is an inclined surface, and the air flowing into the lower tank flows along this inclined surface to the lower tank. The flow is made to flow to the top of the screen.

A vent pipe that communicates the inside and outside of the tank is provided at a portion of the lower side of the tank that faces the uppermost position of the inclined surface. This vent pipe is communicated with the reserve tank or opened to the atmosphere through a pipe or hose provided with an on-off valve.

(Function) Since the heat exchanger of the present invention is constructed as described above, the air flowing into the lower tank flows toward the top of the tank along the lower surface of the inclined spacer, and then flows toward the top of the tank. It is discharged outside the tank through a vent pipe installed at the top.

(Example) Next, the present invention will be explained in more detail by explaining the illustrated embodiment.

FIG. 1 shows a first embodiment of the invention. In order to attach the lower tank 5b, a spacer 10 made of synthetic resin or the like is attached to the lower surface of the seat plate 4 provided at the lower end of the core portion 3. The upper surface of this spacer 10 is shaped to be in close contact with the lower surface of the seat plate 4, and the lower end of each of the heat exchanger tubes 1, 1 is tightly arranged in the portion facing the lower end of each heat exchanger tube 1, 1. An opening 11 into which it can fit is provided. Further, the lower surface of the spacer 10 forms an inclined surface 12 that slopes across the width direction of the tank 5b.
Air bubbles entering the tank are made to collect on one side of the upper part of the tank (left side in Figure 1). An outward flange 13 is formed on the outer peripheral edge of the upper end of the spacer 10, and a frame-shaped packing 14 having a U-shaped cross section is fitted onto the outward flange 13. tank 5
When fixing b to the lower surface of the seat plate 4, the packing 14 is sandwiched between the lower surface of the seat plate 4 and the upper surface of the outward flange 15 formed on the outer periphery of the upper end of the tank 5b, and the seat plate 4 is folded. This is done by caulking the bent portion 18 toward the outward flange 15 of the tank 5b. On the other hand, on the outer surface of the upper part of the tank 5b, a vent pipe 16 as shown in FIG. There is. One end of a pipe or hose with an on-off valve installed in the middle is connected to this air vent pipe 16, and the other end of this pipe or hose is either open to the atmosphere or used for replenishing water to the heat exchanger. Connected to the reserve tank.

In the heat exchanger of the present invention configured as described above, the heat exchanger tubes 1, 1 flow down to the lower tank 5.
The air that has entered into the tank 5b flows along the slope 12 formed on the lower surface of the spacer 10 to the uppermost position of the tank 5b, and is discharged from the air vent pipe 16. An on-off valve is provided in the middle of the pipe or hose whose one end is connected to the air vent pipe 16, and this valve is opened only when air accumulates in the upper part of the tank 5b.
The water stored in b will not be discharged. Note that the opening/closing operation of the on-off valve may be done manually, but
Various sensors such as a water level sensor or a photoelectric tube were installed near the opening of the vent pipe 16 at the top of the tank 5b, and this sensor detected the presence of air (no water) near the opening of the vent pipe 16. It is also possible to open an electromagnetic on-off valve only when the situation arises.

Next, FIG. 3 shows a second embodiment of the present invention. In this embodiment, the present invention is applied to the second example of the previous invention shown in FIGS. 7 and 8. The lower surface of the synthetic resin spacer 17 has a flat upper surface so that the outward flange 9 formed at the lower end of each heat exchanger tube 1, 1 can be held between the lower surface of the synthetic resin seat plate 4. The tank 5b has an inclined surface 12 that is inclined in the length direction and is highest at the center, and a vent pipe 16 is provided at the upper side of the tank 5b opposite to the uppermost position of the inclined surface 12. In the case of this embodiment as well, the air entering the tank 5b from the heat transfer tubes 1, 1 is guided by the inclined surface 12 and
is discharged from.

In addition, in the first and second embodiments described above, the lower surface of the spacer 10 or 17 was inclined in either the width direction or the length direction of the tank 5b, but it is At the same time, the spacer may also be inclined in the length direction so that the air entering the tank 5b is guided by the inclined surface formed on the lower surface of the spacer and concentrated at one point.

c. Effects of the invention Since the heat exchanger of the invention is configured and operates as described above, it is possible to effectively discharge air that has entered the lower tank regardless of the installation state of the heat exchanger. Various inconveniences caused by air being mixed into cooling water can be eliminated.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a sectional view corresponding to the A-A cross section of FIG. 4 showing the lower tank part of the heat exchanger, and FIG. Fig. 1 is a sectional view taken along line B-B in Fig. 1, Fig. 3 is a longitudinal sectional front view of the lower part of a heat exchanger showing a second embodiment of the present invention, and Figs. 4 and 5 show an example of a conventional heat exchanger. , FIG. 4 is a front view, FIG. 5 is an enlarged sectional view taken along line A-A in FIG. 4, and FIG.
7 and 8 show the second example, and FIG. 7 is a longitudinal sectional front view of the lower part of the heat exchanger, and FIG.
The figure is a perspective view of the lower part of the heat exchanger tube. 1: heat transfer tube, 2: fin, 3: core, 4: seat plate, 5a, 5b: tank, 6: inlet pipe, 7: outlet pipe, 8: spacer, 9: outward flange, 10: spacer, 11: opening, 12: inclined surface, 13: outward flange, 14: packing, 15: outward flange, 16: vent pipe, 17: spacer, 18: bent portion.

Claims (1)

[Scope of utility model registration request] In a heat exchanger, tanks are fixed via seat plates above and below a core part consisting of a large number of heat transfer tubes and fins, and an inlet pipe is provided in the upper tank and an outlet pipe is provided in the lower tank. , Attach a plate-shaped spacer with a sloped lower surface to the lower surface of the seat plate on which the lower tank is attached, which has a number of openings that align with the lower ends of the heat transfer tubes that pass through the seat plate in a liquid-tight manner. The heat exchanger is further characterized in that a vent pipe is provided at a portion of the upper side of the lower tank that is aligned with the uppermost position of the lower surface of the spacer.