JPS5920958B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger installed on the combustion air supply side of a boiler or the like.

Generally, combustion air from a boiler or the like is supplied after being heated by a heat exchanger to increase combustion efficiency, and waste gas from the boiler or the like is reused as the heat amount.

When a conventional heat exchanger is shown in FIG. 1, the external body 2 is formed by stacking refractory bricks 1, with a waste gas outlet 3 at the bottom side and a combustion air outlet 4 at the other end. and exit 5
is provided.

On the other hand, the inside does not rust.

The 7-land 7 is alternately connected to vibro made of ceramic, which has characteristics such as non-flammable and non-scratch, and also has excellent not only electrical insulation but also high strength, abrasion resistance, heat resistance, corrosion resistance, precision, etc. The internal body 9 is constructed by forming heat transfer tubes 8 and connecting and fixing each flange portion of a large number of heat transfer tubes 8.

Further, the inner body 9 and the outer body 2 are attached so that the vibro parts of the inner body 9 face the combustion air ports 4 and 5 of the outer body 2, respectively.

Next, the operating procedure of the conventional heat exchanger will be described. Waste gas passes through the heat exchanger tube 8 from the upper end 8a, passes through the lower end 8b, and is discharged from the waste gas outlet 3.

Therefore, the vibro or flange of the internal body 9 receives heat from the waste gas.

On the other hand, the combustion air flows from the inlet 4 provided in the external body 2 into the space outside the pipe section 6a at the lowest stage, where the pipe section 6a absorbs the amount of heat received from the waste gas as described above. Then take a detour to the second stage.

In the same way, the amount of heat from each step is absorbed and passed through the air outlet 5.
It is sent to the combustion device as combustion air, and its purpose as a heat exchanger is achieved.

However, since the structures of the heat exchanger tubes 8 and the heat exchanger internal body 9 are extremely complicated, installation is difficult and the cost is relatively high.

In view of the above-mentioned conventional drawbacks, the present invention improves and eliminates them, and provides a heat exchanger with a better heat exchange efficiency than the conventional ones.

The structure of the present invention will be explained below according to the embodiments shown in the drawings.

In Fig. 2 A to Fig. 4, 10 is a box-shaped heat transfer body with both end faces open, and a plurality of through holes 11 are provided in the upper and lower sides. Insert 12.

In the manner described above, as shown in FIG. The upper and lower ends of the box-shaped heat transfer body 10 are fitted into the box-shaped heat transfer body 10 to form the main body 13 of the heat exchanger.

The combustion air circulation gap formed between the plurality of box-shaped heat transfer bodies 100 can be freely adjusted by changing the arrangement interval of the holes 17 provided in the support plate 16.

Therefore, a plurality of sets of support plates 1 with holes 17 arranged at different intervals are provided.
6 is prepared in advance, it is possible to easily secure a combustion air circulation gap that matches the operating conditions of the heat exchanger.

The thus assembled heat exchanger is as shown in Fig. 4.
By causing waste gas to flow through each of the heat transfer bodies 10 in the vertical direction, and by causing combustion air to flow through the passages 15 formed between the heat transfer bodies 10 in the lateral direction, the inside of the heat exchanger 13 is causes a heat exchange effect.

That is, the thermal energy of the waste gas is transferred to the combustion air via the heat transfer body 10 and the metal rod 12, and heats the combustion air to a predetermined temperature.

Normally, the flow rate of the fluid flowing backward through the passage is high in the center and slow at the wall surface, so the combustion air flowing in the center of the passage 15 in the present invention is not sufficiently exchanged with heat. This is not desirable as you will have to pass through it.

However, since the metal rod 12 passes through the through hole 11 of the heat transfer body 10 and is present perpendicular to the flow direction of the combustion air, the combustion air collides with the metal rod 12 and is disturbed within the passage 15. It's going to happen.

This allows the combustion air to evenly contact the heat transfer body 10 and the metal rod 12 and absorb the amount of heat, thereby providing an efficient heat exchanger.

Note that the waste gas flowing through the heat transfer body 10 contains dust, which adheres to the metal rod 12 over time of use, reducing the heat transfer area and causing a decrease in the heat exchange rate.

Since this is unfavorable in terms of performance, if the metal rod 12 is reciprocated as a means to remove it, the dust adhering to the metal rod 12 will come into contact with the end surface of the through hole 11 of the heat transfer body 10, and the dust will be peeled off. .

Therefore, the heat transfer surface of the metal rod 12 can be kept clean at all times, and sufficient heat exchange can be performed.

In carrying out the present invention, the upper and lower ends of each heat transfer body 10 fit into holes 17 drilled in the support plate 16,
Since the metal rods 12 are fixed at constant intervals, even if the metal rods 12 are subjected to reciprocating motion along the axial direction, the combustion air circulation gap formed between each heat transfer body 10 will not be affected. There will be no confusion.

The metal rod 12 functions as the reciprocating member, as shown in FIG.
It is designed to be longer than the full width of the heat transfer body 10, and is slidably inserted into the through hole 11 formed in the heat transfer surface of the heat transfer body 10 within a range that can maintain appropriate airtightness.

As explained above, the present invention provides a plurality of through holes in the heat transfer surface of a box-shaped heat transfer body with openings on both ends, and inserts a metal rod or the like having good thermal conductivity into the through holes. Because multiple heat transfer bodies are stacked at appropriate intervals, the structure is simple and inexpensive.
Furthermore, by inserting a metal rod, the heat transfer area is expanded or the combustion air is disturbed to promote the heat exchange action, making it possible to provide a highly efficient heat exchanger.

Further, although dust contained in the waste gas adheres to the metal rod and reduces the heat exchange rate, it has the advantage that it can be removed simply by reciprocating the metal rod.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional heat exchanger, and FIG. 2A is a top view of a heat transfer body of a heat exchanger according to the present invention, and the opening is a sectional view taken along line A-A. FIG. 3 is a perspective view of the main body of the heat exchanger according to the present invention;
The figure is an explanatory diagram of its operation. DESCRIPTION OF SYMBOLS 10... Heat transfer body, 11... Through hole, 12... Metal rod, 13... Heat exchanger main body, 15... Passage.

Claims (1)

[Claims] 1 A plurality of through holes are bored in the heat transfer surface of a box-shaped heat transfer body having ventilation openings on both end faces, and a plurality of through holes are arranged in parallel with the openings of the box-shaped heat transfer body aligned in the same direction. and a rod made of a metal material with high thermal conductivity is inserted into the through hole to join the plurality of box-shaped heat transfer bodies into an integral structure while maintaining a predetermined interval. Further, both ends of the box-shaped heat transfer body are supported while maintaining the predetermined distance by support plates with holes into which the ventilation openings are fitted, and the rod body is aligned within the through hole with its axis line. A heat exchanger characterized in that it is configured to be able to slide along a direction.