JPH0224062Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is connected to the flue of a hot water boiler, once-through boiler, etc., and recovers the waste heat released to the outside through the flue. This relates to a chimney that allows for effective use of the chimney.

[Conventional technology]

As a conventional technique, there is one described in Japanese Utility Model Publication No. 18363/1983, but this is in a different technical field from the present invention. The invention described in Japanese Utility Model Publication No. 52-18363 relates to a cooler with a built-in radiator, and its technical machine is shown in FIGS. 1 and 2. This cooler with a built-in radiator has an inner tube 2 inserted into an outer tube 1 and its both ends joined to form a double tube 3, and the outer tube 1 and inner tube 2 have spiral waves with equal pitch. The curves 4 and 5 are formed, and the concave and convex portions thereof are made to face each other so as to be concentric, and the caps 6 and 7 attached to both ends of the outer cylinder 1 are separated from the wall surface 10 of the water tank 9 in the radiator 8. It was installed.

By circulating the oil to be cooled between the outer tube 1 and the inner tube 2, the oil is cooled by the cooling water flowing inside the inner tube 2. In this way, the invention described in Publication of Utility Model Publication No. 18368/1983 is
This is a cooler with a built-in radiator that cools oil, and is different from a chimney that is configured to effectively utilize waste heat released from a boiler as in the present invention.

Conventionally, for example, in hot water boilers, the thermal efficiency is 60 to 70%, and the remaining 40 to 30%
% of heat is released to the outside through the flue and chimney, improving thermal efficiency.

B. Purpose of the invention The purpose of the invention is to provide a waste heat recovery chimney that can improve the thermal efficiency of boilers, etc., has good assembly properties, and is easy to maintain and inspect.

C. Structure of the invention The present invention inserts an inner wall cylinder 16 into an outer wall cylinder 15,
A bellows-type inner cylinder 13 with a double wall structure in which a cylindrical water passage 17 is formed between the two cylinders 15 and 16 by welding the upper and lower ends of the bellows-shaped cylinders 15 and 16;
Water supply and drainage mouthpieces 2 are attached to the upper and lower ends of the inner cylinder 13 and communicated with the liquid passage 17, respectively.
6, 27, an air venting cap 28 which is attached to the inner cylinder 13 at a position above the water supply cap 26 and communicated with the water liquid passage 17, and an air venting cap 28 which is mounted on the inner cylinder 13 at a position above the water supply cap 26 and communicated with the water liquid passage 17, and an air venting cap 28 which is arranged at equal circumferential positions on the outer circumferential surface of the upper opening end of the inner cylinder 13. A radially fixed positioning piece 29, a cylindrical body connection part to which a cylindrical body is removably connected at the upper end, and a flue connection part to which the cylindrical body is removably connected to the flue of a boiler or the like at the lower end. and an outer cylinder 14 formed with through holes 30, 31, 32 having larger diameters than the respective caps 26, 27, 28, and an inner circumferential surface of the flue connection part of the outer cylinder 14. The support leg 33 is fixed to the outer cylinder 14 and supports the inner cylinder 13 loosely fitted to the outer cylinder 14 in a concentric manner.
The upper end portion of the inner tube 13, which is loosely inserted into the support leg 33 and supported, is positioned and held concentrically by the positioning piece 29 that comes into contact with the outer tube 14, and each of the caps 26, 27, 28 are made to protrude outside from the through holes 30, 31, 32 of the outer cylinder 14, and the gap around the base is closed with a ring 41.

〔Example〕

3 to 9 show embodiments of the present invention. In the same figure, 11 is a boiler, 12 is a boiler 1
This chimney 1 is a waste heat recovery chimney connected to the flue 1.
2 shows the double-walled inner cylinder 13 loosely inserted into the outer cylinder 14 and directed. The inner cylinder 13 has an inner wall cylinder 16 inserted into the outer wall cylinder 15, and the inner and outer wall cylinders 15,1
Weld the upper and lower ends of 6 by seam welding to form both cylinders 1
An aqueous liquid passage 17 is formed between 5 and 16.
Further, annular or spiral grooves 15a, 16a are formed at a fixed pitch in the outer wall tube 15 and the inner wall tube 16, and the grooves 19, 20 and 21, 22 are opposed to each other to form bellows-shaped grooves. Tubes 15, 16
are arranged concentrically, and the inner cylinder 13 is configured in a bellows shape. 23, 24, 25 are sockets that are fixed through the upper and lower ends of the outer wall cylinder 15 constituting the inner cylinder 13;
Reference numerals 26, 27, and 28 denote water supply/drainage ports 26', 27' and air vent ports 2, which are removably attached to the upper and lower ends of the outer wall tube 15 via sockets 23, 24, and 25.
8', this cap 26, 27, 2
8 communicate with the liquid passage 17 of the inner cylinder 13, and the air venting cap 28 communicates with the water supplying cap 26.
It is attached to the inner cylinder 13 at a higher position. Reference numeral 29 denotes positioning pieces fixed radially on the outer circumferential surface of the upper opening end of the inner cylinder 13 at equidistant positions on the circumference.
3 is supported in the outer cylinder 14, the tip end surface of the positioning piece 29 comes into contact with the inner peripheral surface of the outer cylinder 14, and the upper end of the inner cylinder 13 is always held concentrically with respect to the outer cylinder 14. .

The outer cylinder 14 has a larger diameter than the inner cylinder 13, has a cylindrical body connection part at the upper end to which a cylindrical body described below is detachably connected, and has a lower end which can be detachably attached to the flue of the boiler 11. The flue connection part 14a is connected to the flue connecting part 14a, and the upper and lower ends thereof are provided with through holes 30, 31, 32 having a larger diameter than the caps 26, 27, 28 for water supply and drainage and for air venting, respectively. Form. 33 is the flue connection part 1 at the lower open end of the outer cylinder 14
This support leg 3 is fixed to the inner peripheral surface of 4a.
3, the inner cylinder 13 loosely inserted into the outer cylinder 14 is positioned and supported concentrically. The support leg 33 is made up of four strip plates 34.
By bending and forming both ends of the strip plate 34 into a predetermined shape to form an abutment piece 35 and a mounting piece 36, and welding each abutment piece 35 to the abutment piece 35 of an adjacent strip plate 34, the strip plate 34 The straight portion 37 of the outer cylinder 14 is formed into a square frame, and each mounting piece 36 is welded to the inner circumferential surface of the lower open end of the outer cylinder 14. The upper end edge of the straight portion 37 of each of the strip plates 34 is notched along the longitudinal direction to form an inner cylinder fitting part 38, and the stepped surface 39 prevents the inner cylinder 13 from touching sideways.

Incidentally, reference numeral 40 denotes a plurality of positioning pieces radially fixed at equidistant positions on the circumference of the outer peripheral surface of the lower opening end of the inner cylinder 13. 41 is the cap 2 for water supply and drainage and air venting
This ring is used to close gaps around the through holes 30, 31, and 32 that are created when the holes 6, 27, and 28 are attached to the inner cylinder 13. Reference numeral 42 denotes an annular protrusion formed on the inner circumferential surface of the connecting portion 11a with the chimney 12 of the boiler 11.

Next, the procedure for assembling the chimney 12 will be explained.

First, the inner cylinder 13 having a double wall structure is loosely inserted into the outer cylinder 14, and its lower end opening edge 13a is fitted into the inner cylinder fitting part 38 of the support leg 33 fixed to the outer cylinder 14. At this time, the sockets 23, 24 attached to the inner cylinder 13,
25 is held at a position corresponding to the through holes 30, 31, and 32 of the outer cylinder 14. After that, the caps 26, 27, 28 for water supply and drainage and air venting are attached to the respective sockets 23, 24, 25 from the outside of the outer cylinder 14, and then the ring 41 is attached to the outer cylinder 14, and the through hole 3
Close the gaps around 0, 31, and 32.

The chimney 12 assembled in this way has its outer cylinder 14
The flue connection part 14a at the lower end of the chimney 12 is inserted into the connection part 11a of the boiler 11 and supported by the annular protrusion 42, and the cylinder 43 is connected to the cylinder connection part at the upper end of the chimney 12. At this time, the inner cylinder 13 loosely inserted into the outer cylinder 14 constituting the chimney 12 has its upper and lower end edges 13a and 13b restricted by the step surface 39 of the cylindrical fitting part 38 of the support leg 33 and the positioning piece 29, respectively. Therefore, it is always held concentrically with respect to the outer cylinder 14 and does not oscillate laterally.

When the chimney 12 is assembled to the boiler 11, water is supplied to the water passage 17 through the water supply port 26'. The supplied water flows through the water passage 17 and is then sent to the boiler 1 via the drain port 27'. At this time, the air in the liquid passage 17 is removed from the water supply port 2.
The air flows out to the outside through an air vent 28' provided above 6'. On the other hand, the combustion gas heats water in the boiler 11 and is then discharged to the outside through the flue and chimney. And the combustion gas is in the chimney 12
It becomes high temperature (approximately 250-350℃) when passing through the inside,
When this high-temperature combustion gas passes through the chimney 12 in the direction of the arrow shown in the figure, the waste heat is transferred to the outer wall tube 15 of the inner tube 13.
The hot water is transmitted to the water flowing through the liquid passage 17 through the inner wall cylinder 16, and as a result, the water in the liquid passage 17 becomes hot water and is sent to the boiler 11 from the drain port 27'. Therefore, the amount of fuel consumed in the boiler 11 is reduced, and the thermal efficiency is extremely improved.

When the high-temperature combustion gas passes through the chimney 12, the inner cylinder 13 thermally expands, but since the inner cylinder 13 has a bellows shape, the strain or elongation is absorbed by the deformation of the bellows shape. Inner cylinder 1
3 will not be damaged.

FIG. 10 shows another embodiment of the means for assembling the chimney 12 to the boiler 11;
2 is fitted into the connecting portion 11a of the boiler 11. That is, the lower opening end edge of the outer cylinder 14 is extended, and this extended portion 14b is fitted into the connecting portion 11a of the boiler 11, and the connecting portion 11a is inserted into the connecting portion 11a of the boiler 11.
It is designed to be supported by an annular protrusion 44 formed on the outer circumferential surface of.

The chimney 12 described in the above embodiment can be immersed in a molten aluminum bath to form aluminum processed layers on the inner and outer peripheral surfaces of the inner and outer cylinders 13 and 14 to obtain a chimney with better heat resistance. be able to. Further, a heat insulating layer may be formed on the outer peripheral surface of the outer cylinder 14 using a suitable material.

[Effect of idea]

The chimney according to the present invention can reliably hold the inner cylinder concentrically with the outer cylinder by simply inserting the inner cylinder loosely into the outer cylinder which is detachably attached to a boiler etc. It has a simple structure, is easy to assemble, can be manufactured at low cost, and is easy to disassemble, so maintenance and inspection can be performed easily and quickly. Further, since the water in the water passage of the inner cylinder flows naturally, there is no need to forcibly pump the water in the water passage with a pump or the like, and energy consumption can be significantly reduced. Furthermore, since the inner cylinder is a bellows type consisting of a bellows-shaped outer wall cylinder and an inner wall cylinder, even if the inner cylinder thermally expands due to the passage of combustion gas, the distortion or elongation will be caused by the bellows part of the inner cylinder. It will be absorbed and the inner cylinder will not be damaged. In addition, the inner cylinder is a bellows type consisting of a bellows-shaped outer wall cylinder and an inner wall cylinder, and the water passage is cylindrical, so the heat transfer area for waste heat is large and a large amount of water can be transferred in a short amount of time. It is possible to heat water in a short amount of time, and it is possible to send a large amount of hot water to boilers, etc. Furthermore, it is possible to reliably hold the inner cylinder concentrically with the outer cylinder, so the inside of the chimney can be heated. The waste heat of the passing combustion gas can be utilized as effectively as possible.
As a result, the amount of fuel consumed by boilers and the like is significantly reduced, and thermal efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are explanatory diagrams of the prior art.
FIG. 3 is a schematic explanatory diagram of a chimney according to the present invention, FIG. 4 is a cross-sectional view of the main part showing the upper end of the chimney, and FIG. Fig. 6 is a cross-sectional view of the main part showing how the positioning piece is attached, Fig. 7 is a plan view showing the lower end of the chimney, Fig. 8 is a plan view of the support leg, and Fig. 9 is a front view thereof. 10 are explanatory diagrams showing other embodiments of the means for assembling the chimney to the boiler. 11...Boiler, 12...Chimney, 13...Inner tube, 14...Outer tube, 15...Outer wall tube, 16...Inner wall tube, 17...Water liquid passage, 26, 27, 28...
Cap, 29... Positioning piece, 30, 31, 32...
...Through hole, 33...Support shaft, 41...Ring.

Claims (1)

[Scope of utility model registration request] A bellows-type inner cylinder with a double-wall structure in which an inner wall cylinder is inserted into an outer wall cylinder, and the upper and lower ends of the bellows-shaped cylinders are welded to form a cylindrical water passage between the two cylinders;
A cap for water supply and drainage that is attached to the upper and lower ends of the inner cylinder and communicated with the liquid passage, respectively, and an air vent that is attached to the inner cylinder at a position above the water supply cap and communicated with the liquid passage. a base, positioning pieces fixed radially at equal circumferential positions on the outer peripheral surface of the upper opening end of the inner cylinder, and a cylinder connecting part to which the cylinder is detachably connected at the upper end, and the lower end. The outer cylinder has a flue connection part that is detachably connected to the flue of a boiler, etc., and has a through hole with a diameter larger than that of each of the above-mentioned caps, and a flue of the outer cylinder. The above-mentioned support leg is fixedly installed on the inner circumferential surface of the connecting part and concentrically supports an inner cylinder that is loosely inserted into the outer cylinder, and is supported by being loosely inserted into the outer cylinder and fitted on the support leg. The upper end of the inner cylinder was positioned and held concentrically by the positioning piece that abuts the outer cylinder, and each cap was made to protrude outside from the through hole of the outer cylinder, and the gap around the cap was closed with a ring. A waste heat recovery chimney characterized by: