JPH0477237B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a vibration-proof buffling device arranged in a staggered array of heating tubes.

In a heat exchanger placed in a gas flow passage,
When the heating tube is arranged to cross the direction of the gas flow, resonance between the Karman vortex generated on the gas trailing side of the heating tube and the natural frequency of the air column between the gas passage width walls causes It is well known that vibrations increase and the walls of the gas flow passage vibrate. As a method for preventing this resonance, generally a means is used to divide the width of the gas flow path into small sections in order to increase the natural frequency of the air column of the gas path. In other words, by inserting several buttfuls into the gas flow path,
This is a method of subdividing the gas passage.

Conventionally known means for carrying out this method include those shown in FIGS. 1 to 5.

First, as shown in Fig. 1, in a heat exchanger in which the heating tube group is arranged like a base and the distance between the heating tubes 1 is wide to some extent, the arrangement of the heating tube group is not affected. Since the anti-vibration Batsuful 2 can be inserted and equipped, a vibration-isolating effect can be expected without interfering with the heat transfer function. However, if the heating tube group is arranged in a staggered manner, as shown in Fig. 4, In order to insert and equip the vibration-proof buffle 2, it is necessary to widen the spacing between the heating tubes 1 of the vibration-proof buffle part. a is the interval between the general parts of the heating tube group, and A is the interval between the expanded parts. However, when arranged in this way, the gas flow rate of the heating tube group adjacent to the vibration isolating buttful 2 increases, the amount of heat absorbed by the heating tube 1 increases, and the group of heating tubes adjacent to the vibration isolation baffle 2 increases internally compared to other generally spaced heating tube sections. As the fluid temperature increases, the metal temperature of this heating tube 1 also becomes higher than that of other heating tubes 1, so that this heating tube 1 and other heating tubes 1
A difference in thermal expansion occurs between the heating tube 1 and the heating tube 1, which causes thermal stress in the heating tube 1.

Next, the means shown in FIG. 5 is one in which the vibration-proof buffs 3 are bent in accordance with the arrangement of the heating tube groups arranged in a staggered manner, but according to this means, the arrangement of the heating tube groups is irregularly arranged. Since there is no need to do so, the above-mentioned disadvantages of the difference in gas flow and the difference in heat absorption of the heating tubes 1 are eliminated.

However, since the vibration isolation baffle 3 is installed in a state where it is inserted into the group of heating tubes, it becomes extremely difficult to manufacture and assemble it. That is, after the assembly of the heating tube group is completed, it is not possible to insert the vibration isolating buttful 3, so it is necessary to insert and assemble it in parallel with the assembly of the heating tube group, which ultimately makes it difficult to assemble the heating tube group. Moreover, if you want to pull out the heating tube group for maintenance inspection after operation, you cannot pull it out because of the anti-vibration bumper 3, which has the disadvantage of being impractical. .

The present invention has been made in order to eliminate the drawbacks of the prior art, and when designing exhaust gas boilers, heat exchangers, etc., it does not impede the vibration isolation effect, it facilitates assembly, and it is easy to maintain after operation. It is an object of the present invention to provide a vibration-proof vibration damping device that can be inspected, thereby improving the reliability and reducing costs of the exhaust gas boiler and the like.

That is, the present invention provides a vibration-proof buffle device arranged in a group of heating tubes arranged in a staggered arrangement, in which a wave-shaped vibration-proof buffle divided into every two or three of the heating tubes is connected to the heating tubes via an interlocking metal. The anti-vibration buttful device is characterized by being attached to the.

The invention will now be described in detail with reference to illustrative embodiments. Note that the same reference numerals are used for components common to the conventional one.

FIG. 6 shows that the heating tubes 1, 1 are arranged approximately vertically,
A side cross-sectional view is shown in which a heat exchanger R in which headers 4 and 5 of the heating tubes 1, 1, . 7 is a peripheral wall of the gas flow passage of the heat exchanger R; 8 is a metal fitting for attaching the vibration-proof buffling device 6 to the heating tube 1; in FIG. It is a spiral fin.

When the heating tubes 1, 1, . . .
As shown in the figure, each block 12 of the group of heating tubes is divided into approximately the length of the block width and assembled into the block 12.

FIGS. 10 and 11 show an embodiment in which the block 12 has two pieces, and in that case, the vibration isolating baffle device 6
As shown in FIG.
The first bent piece 61 on the left end side is a diagonal part, and the second bent piece 62 connected to the first bent piece 61 has a diagonal part in the opposite direction. , a third bent piece 63 connected to the second bent piece 62
The bent piece 64 on the right end side, which is connected to the third bent piece 63, is a protrusion parallel to the gas flow direction. The heating tube 1 comes into contact with the wedge angle between the first bent piece 61 and the second bent piece 62, and the wedge angle between the second bent piece 62 and the third bent piece 63, respectively. One end of the U-band-shaped engagement alloy 8 that wraps around each heating tube 1 is fixed to a first bent piece 61 and a third bent piece 63.

FIG. 9 shows an anti-vibration buffling device 6 that is incorporated when the block 12 belongs to the three-piece configuration. The vibration-proof buffling device 6 in this case has two buffle plates 60 as a set, and the buffle plate 60 located on the left side is bent into one stage, and the buffle plate material 60 located on the right side is bent into two stages. That is, the baffle plate 60 located on the left side has a curved mountain shape, and the buffle board material 60 located on the right side has a curved mountain shape and a protrusion parallel to the gas flow direction for insertion into the wake block. Form. These baffle plates 60, 60, which are divided into left and right sides, are inserted into a three-piece block (corresponding to 12 in Fig. 11) from the front and back directions of the gas flow, and are supported at the ends of their joints, respectively. A plurality of plates 9, 9 are arranged at different levels so as to intersect and protrude forward (downward in FIG. 9). and U-band shaped engagement alloy 8
is the left and right divided full plate material 60, which is divided into two parts.
The heating tubes 1, 1 at the end of the block that can come into contact with each chevron portion of the block 60 are wound, and one end of the heating tube
It is fixed to bent pieces 65 and 66 of 0.0 and 60 mm.
Further, reference numeral 10 denotes a U-band-shaped engagement alloy whose one end is fixed to the tip of each of the support plates 9, and is wound around the heating tubes 1, 1 in front of the heating tubes 1, 1.

In FIG. 13, G indicates the case where a plurality of heating tube blocks 12 are assembled and the heating tubes 1, 1, etc. are arranged in a regular staggered arrangement (FIG. 10,
Figure 1) shows the distance between the adjacent vibration damping baffle devices 6 and 6' and the distance between the heating tube 1' and the heating tube 1' at the start of assembly. The insertion state of the vibration isolating buffling device 6 is shown, and g also shows the insertion state of the adjacent vibration isolating buffling device 6' when the heating tube block 12 is assembled in the correct position.
The dimensions of the minute gap between the vibration-proof buffling device 6 and the heating tube 1' are shown.

Next, the operation of the vibration damping baffle device configured as described above will be explained together with the assembly method for two cases and three cases.

When using two heating tubes 1, 1, . The anti-vibration buffling devices 6, 6, . . . are installed at a predetermined interval in the direction. In this case, each vibration damping plate 60 of each vibration damping device 6, 6... is connected to the heating tube 1.
The blocks 12 are engaged and supported through the U-band shaped engagement alloy 8, and the protrusion 64 of the buffle plate 60 is provided on the rear surface of each block 12 (right side in FIG. 11).
stands out.

When the blocks 12 are brought close to each other, the first bent piece 61' of the baffle plate 60' incorporated therein is diagonally upward on the front side of the other block 12, as shown in FIG. It is inclined and opens as an insertion opening for the mating protrusion 64, and the interval for inserting the protrusion 64 is a large gap G on the left and right sides in the insertion direction, making it easy to insert and assemble.

Therefore, when the vibration-proof buffling device 6 is partially inserted between the vibration-proof buffling device 6' of the adjacent block 12 and the heating tube 1', it becomes easy to insert it to the fixed position shown by the dotted line. Even if it is inserted into the position shown by the two-dot chain line with a slight deviation due to a manufacturing error, etc., it will be guided to the proper position by the inclined surface of the first bent piece 61' and will be easily inserted.

After being inserted into the fixed position, the distance g between the vibration-proof buffling device 6' and the heating tube 1' is narrow, which is effective in preventing large vibrations. Although it is extremely difficult to insert it into this minute gap from the beginning,
Due to the inclination of the bent piece 61' and the arcuate surface of the heating tube 1', the insertion opening widens in a tapered shape when viewed in cross section, making insertion extremely easy.

In this way, each of the blocks 12, 12
... are assembled at predetermined positions as shown in FIG.

After each of these blocks 12, 12... is assembled in the gas flow passage, as shown in FIG. 6, when gas is fed in the direction of the arrow, the gas flows as shown in FIG. As shown, it flows through the space between the adjacent heating tubes 1, 1 in the front row of each block (the left side of the solid line in the figure) and passes through the rear row side (the right side of the solid line in the figure). Board material 60
and the lower heating tube 1 on the side of the distance A, and the distance B between the buttful plate material 60 and the upper heating tube 1 is wide.
On the back row side, conversely, the space A side is narrow and the space B side is wide.
The gas flow is approximately averaged, with almost no deviation, and the state is almost the same as in the general part where the vibration damping buffer device 6 is not installed, and the amount of heat absorbed by the heating tube 1 is uniform. There is no metal temperature difference between the heating tubes 1, no thermal stress is generated in the heating tubes 1, and the heating tubes 1 are safe.

Furthermore, as for the vibration-proofing function, the vibration-proofing buffling device 6 is divided for each block 12 of the heating tube 1, but the mutual vibration-proofing buffling device 6, 6... Further, as shown in FIG. 12, the vibration damping buffling device 6 is inserted into a narrow space between the vibration damping buffling device 6' and the heating tube 1' on the rear row side. The distance between the anti-vibration buffling devices 6 and 6' does not become large.

For this reason, the vibration damping buffer device 6
Although the structure is divided into blocks 12, it has the same vibration-proofing effect as a single-plate system.

In the case of using three heating tubes, a vibration-proof buffling device having the configuration shown in FIG. 6 are assembled at predetermined intervals in the longitudinal direction of each block, and then each block 12, 12, . . . is assembled at a predetermined position. When assembling, each block 12
The anti-vibration buffer device 6 of... is shown in FIGS. 12 and 13.
It is set as shown in the figure.

The safety of the heating tube 1 and the anti-vibration function of the anti-vibration buffer device are the same as in the case of the two-tube arrangement.

As described above, according to the vibration-proof vibration damping device of the present invention, when the heating tubes are arranged in a staggered arrangement, the spacing between the arranged portions does not have to be widened unlike in general portions, and sufficient protection can be achieved. The vibration effect is exerted,
Furthermore, it facilitates assembly into a staggered arrangement, and also facilitates assembly and disassembly of the heating tube block and disassembly of the vibration isolation baffle device alone.

[Brief explanation of the drawing]

Figures 1 to 5 relate to conventionally known vibration-proof buffling devices; Figure 1 is a plan cross-sectional view of a heat exchanger in which heating tubes are arranged in a grid pattern and is equipped with a vibration-proof buffling device; Figure 1 - Line side view, Figure 3
The figure is a cross-sectional view taken from Figure 2, and Figure 4 is a heat exchanger in which heating tubes are arranged in a staggered manner, and the heating tubes are arranged with wider intervals in the part where the vibration isolation baffle device is installed. FIG. 5 is a plan sectional view of the case where the vibration isolating baffle is bent in a staggered arrangement, and FIGS. 6 to 13 relate to the vibration isolating buffle device according to the present invention. The figure is a side cross-sectional view when a heat exchanger is equipped with a vibration-proof buffling device, Figure 7 is a cross-sectional view taken along the line shown in Figure 6, and Figure 8 is an implementation when two heating tubes are used as a block. FIG. 9 is a plan sectional view of an example in which the heating tube is made into a block with three tubes, and FIG. Fig. 11 is a plan sectional view of the block alone before assembling the block shown in Fig. 10, and Fig. 12 is an enlarged plan view of the situation after the vibration isolating baffle device between the same blocks is assembled. The cross-sectional view and FIG. 13 are explanatory diagrams of the assembled state of the vibration-proof buffling device. DESCRIPTION OF SYMBOLS 1... Heating tube, 4, 5... Header, 6... Vibration-proof bump-full device, 60... Bump-full plate material (vibration-proof bump-full), 7... Gas flow passage peripheral wall, 8... Engaging alloy,
9...Support plate, 10...Interlocking alloy, 11...Spiral fin, 12...Block.

Claims (1)

[Claims] 1. In a vibration isolation buffle device arranged in a group of heating tubes in a staggered arrangement, a wave-shaped vibration isolation buffle divided into every two or three of the heating tubes is attached to the heating tubes via an interlocking metal. An anti-vibration buttful device characterized by: