JPS5928733B2 - Exhaust pipe support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust pipe support device applied to a twin-back engine that performs static pressure supercharging.

The twin bank type engine, as shown in Figures 1 and 2,
Two engine bodies 1 and 2 are arranged in parallel on a common bed plate 3, and one exhaust pipe 4 is used, and a reduction gear 5 is provided at one end, that is, on the stern side in the case of a ship.

The exhaust pipe 4 connects a plurality of unit pipes 4a to 4d with expansion joints 8a to 4d.
It is connected with 8c.

In such an engine, the two superchargers 6a and 6b are
As shown in the figure, it is required to arrange two units side by side on the stern side for compactness.

Note that 7a and 7b are connection pipes that connect the exhaust pipe 4 and the superchargers 6a and 6b.

In other words, two superchargers 6a and 6b may be arranged, one at each end of the exhaust pipe 40, or above the exhaust pipe 4, but in cases where there are vertical and longitudinal limitations on the space inside the ship. It is advantageous to arrange the superchargers 6a and 6b as in the example shown in the figure.

However, the static pressure supercharging method requires a much thicker exhaust pipe 4 compared to the dynamic pressure supercharging method, and therefore two superchargers 6a are required as shown in the figure.

When 6b are arranged side by side, it becomes difficult to support the exhaust pipe due to unbalanced gas pressure with the bow side.

In other words, if the two superchargers 6a and 6b are installed on the stern side, the gas pressure receiving area will be larger on the bow side (A-A cross section in Figure 2) and the stern side (B-B cross section in Figure 2). However, when the unit pipes 4a and 4d at both ends are connected by a tension bolt as a support means for the exhaust pipe 4 as in the conventional case, an unbalanced force Pu expressed by the following equation acts on the tension bolt.

Pu-P(A1-A4+2A2) Here, P: gas pressure, A1: cross-sectional area of unit pipe 4d, A
4: Cross-sectional area of unit pipe 4a, A2: Cross-sectional area of connecting pipes 7a, 7b.

A bracket is required on the surface of the high-temperature (40° to 450° C.) exhaust pipe as a supporting portion to support this unbalanced force Pu, and therefore it is difficult to design the exhaust pipe with safety in terms of strength.

Furthermore, the following points also pose problems in supporting the exhaust pipe 4.

That is, an expansion joint 8d is attached to the unit pipe 4d at the end of the exhaust pipe 4.
The end cover 9, which is attached via the
kg/arf, approximately 10 tons of gas pressure is applied, and it is necessary to support this large force safely with a structure as simple as possible.

In addition, since the exhaust hot water temperature is a high temperature of 400 to 450 degrees Celsius,
Since the exhaust pipe 4 undergoes thermal expansion, a support structure that absorbs this expansion and minimizes thermal stress is required.

Since the exhaust pipe 4 is displaced in all directions such as up and down, right and left, and front and back due to thermal expansion, consideration must be given to all of these factors.

The present invention provides an exhaust pipe support device that can solve each of the above-mentioned problems, and one embodiment thereof will be described below with reference to the drawings.

4 to 13 show the exhaust pipe 4 of the engine shown in FIGS. 1 and 2 and its support device.

Each of the unit pipes 4a and 4d of the exhaust pipe 4 has one support leg 10, and is placed on a pedestal 11.degree. 12 via the support leg 10.

Two pedestals 11 and 12 are provided slightly apart from each other in the axial direction of the exhaust pipe 4.

Note that 13 is a branch pipe connected from the exhaust pipe 4 to the exhaust port of the engine body 1.2, and has an expansion joint 14 in the middle.

-1: Connection pipe 7a connected to supercharger 6at6b
, 7b are also provided with expansion joints 15.

Key grooves 18 and 19 are provided along the width direction of the exhaust pipe 40 in the lower surface plate 16 (FIG. 7) of the support leg 10 of each unit pipe 4a to 4d and the upper surface plate 17 of the pedestals 11 and 12. A key 20 fits over the grooves 18,19.

The key 20 has a bolt 21 in the keyway 19 on the pedestal 11.12 side.
The key groove 19 on the supporting leg 10 side is slidable relative to the key 20.

The keyways 18 and 19 are provided approximately at the center of the unit tube 4at4 (1) in the tube axis direction.

The keyway 18°190 is spaced on both sides of the front and back (E-E cross section in Figure 4), and is located at the center of the exhaust pipe 40 in the width direction, as shown in Figure 8.
As shown in FIG. 9, a long hole 22 along the tube axis direction is provided in the bottom plate 16 of the support leg 10, and a guide pin 23 that is slidably fitted into the long hole 22 is inserted into the top plate 17 of the pedestals 11, 12. installed on.

Note that a long hole may be provided in the pedestal 11 and a guide pin may be provided in the support leg 10.

The lower plate 16 of the support leg 10 is pressed against the upper plate 17 of the pedestal LL12 by a clamper 24 shown in FIG.

The clamper 24 is fixed to the top plate 17 with bolts.

The clamper 24 is provided to prevent excessive vibration, and lightly presses the bottom plate 16 so as not to restrict thermal expansion of the support leg 10.

A four-wood guide bar 25 for supporting the end cover 9 is provided on the outside of the expansion joint 8d in the unit pipe 4d at the end of the exhaust pipe 4 (FIG. 10), and is slidable on the guide bar 25. A guided member 26 that fits into the flange 27 of the end cover 9 is attached to the flange 27 of the end cover 9.

A tension rod 28 or pin 34 is attached to the tip of the guide bar 25. A stopper 47 is provided to prevent accidental removal of the end cover 9 due to breakage of the support shaft 31 or the like.

The end cover 9 connects one end of the tension rod 28 disposed on both the left and right sides of the exhaust pipe 4 with a nylon end 29 (the 11th
) and are connected via a bracket 30.

The bracket 30 is fixed to the seven langes 27 of the end cover 9, and the rod end 29 is pivotally supported by the bracket 30 so as to be rotatable around a horizontal support shaft 31.

The other end of the tension rod 28 is connected to a pair of links 32, 3.
It is connected via a rod end 35 to a connecting pin 34 which rotatably connects the free ends of the rods 3 and 3 to each other.

The links 32, 33 are inclined (
If space permits, it may be vertically mounted) It is pivotably supported around a support shaft 36 (Fig. 13) so as to be rotatable in the front and rear directions.

The rod end 35 is connected to the link 3 as shown in FIG.
A spherical bushing 37 fitted onto the connecting pin 34 of 2 and 33
and a spherical seat member 38 having a concave spherical surface that fits externally thereon.

An adjustment bolt 39 is screwed onto the spherical seat member 38, and a connecting member 40 through which the adjustment bolt 39 is inserted is fixed to the tension rod 28. The tension rod is tightened by tightening nuts 41 and 420 screwed onto the adjustment bolt 39. 2
8 is installed with length adjustment force "T".

In this embodiment, the rod end 29 at one end of the tension rod 28 absorbs only the vertical swing, and the rod end 35 at the other end is of a spherical bush type, but the arrangement of both 29° and 35 is reversed. Also, both 2
Both 9 and 35 may be of a spherical bush type.

Further, if the tension rod 28 is sufficiently long, the rod ends 29 and 35 at both ends may absorb only the vertical direction.

Next, the operation of the above configuration will be explained.

Each unit pipe 4a to 4d of the exhaust pipe 4 is heated by the key 2 due to thermal expansion.
0 as the center and extends in the tube axis direction using the guide pin 23 as a guide.

The tube extends in the width direction around the guide pin 23, and the expansion in the tube axis direction and width direction is absorbed by the expansion joints 8a to 8c.

The force in the tube axis direction generated in each unit tube 4a to 4d is supported by the key 20.

This force is caused by the difference in elongation of the unit tubes 4a to 4d in the tube axis direction and the difference in the spring constant of the expansion joints 8a to 8 degrees, and is also caused by the difference in pressure receiving area for the unit tube 4a at the end. Force P8-P (A4-2A2) Force attack and mouth change.

The force generated in the width direction, that is, the force generated due to the difference in gas pressure due to the difference in exhaust timing between the left and right banks, the difference in thermal expansion due to the difference in exhaust temperature, etc., is supported by the guide pin 23.

The guide pin 23 is connected to the unit tube 48 to
Positioning is performed in the width direction of 4d.

The end cover 9 receives a force in the axial direction of the tube of, for example, 10 tons due to the gas pressure, and this force is supported by the tension rod 282 and the links 32 and 332 sets.

Since the links 32 and 38 have edges cut off from the exhaust pipe 4, they do not reach high temperatures and can safely support gas pressure.

Since the exhaust pipe 4 becomes hot, a relative displacement occurs between the fulcrums A and B at both ends of the tension rod 28 during engine operation.

That is, due to the temperature difference between the links 32, 33 and the unit tube 4d, the fulcrum A is displaced upward in the vertical direction, and the fulcrum A is moved outward in the horizontal direction.

This movement is absorbed by the rocking tb of the rod ends 2Q and 35, and the gas pressure can be supported without any problems in terms of strength.

Furthermore, the displacement caused by the temperature difference between the tension rod 28 and the unit tube 4d, that is, the unit tube 4d extends in the axial direction centering on the key 20, and the tension rod 28 is caused by the ring 32.3.
The displacement caused by stretching around the fulcrum of No. 3 is absorbed by the expansion joint 8d.

Although the above embodiment has been described with reference to the case where it is applied to a twin-back type engine, the present invention can also be applied to other engines.

As explained above, according to the present invention, the axial force of each unit pipe of the exhaust pipe is supported by the key, and the pipe is allowed to elongate in the axial direction with the guide pin as a guide around the key, and the said guide Since the force in the width direction is supported by the pin, the high-temperature exhaust pipe can be strongly and safely supported regardless of the force caused by the small gas pressure or thermal expansion.

Further, according to the present invention as set forth in claim 2, the tension rod connected to the end cover is supported by a link pivotally supported on the pedestal, so that the supporting portion does not become hot. The gas pressure acting on the end cover can be safely supported.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a side view of an example of an engine to which the present invention is applied, Fig. 2 is a plan view of the same, and Fig. 3 A.
, B is an explanatory view of the action, FIG. 4 is a side view showing the exhaust pipe and support device, FIG. 5 is a plan view of the same, FIG. 6 is a front view of the same, and FIG. , FIG. 8 is a cross-sectional view taken along the line E-E in FIG. 4, FIG. 9 is a cross-sectional view of the same portion as in FIG. 8 in the exhaust pipe width direction, and FIG. 10 is a cross-sectional view taken along the line D-D in FIG. 5. 11 is a novel cross-sectional view taken along line CC in FIG. 4, FIG. 12 is a cross-sectional view taken along line H-H in FIG. 4, and FIG. 13 is a cross-sectional view taken along line J-J in FIG. 4. 1.2...Engine body, 4...Exhaust pipe, 4a~'ld
”.

Claims (1)

[Claims] 1. An exhaust pipe formed by connecting a plurality of unit pipes with an expansion joint is placed on a pedestal via support legs provided on each unit pipe, and the support legs and the pedestal are connected. A key groove in the exhaust pipe width direction is provided on the contact surface, a key is fitted into the key groove, and a key groove is provided on either side of the key groove in the exhaust pipe axial direction, and a key groove is provided on one of the supporting legs or the base in the exhaust pipe axial direction. 1. A support device for an exhaust pipe, characterized in that a long hole is provided, and a guide pin slidably fitted into the long hole is provided on the other side. 2. An exhaust pipe formed by connecting multiple unit pipes with an expansion joint is placed on a pedestal via support legs provided on each unit pipe, and the width of the exhaust pipe is set on the contact surface between the support legs and the pedestal. a key groove is provided in the direction, a key is fitted into the key groove, a long hole is provided in one of the support legs or the base in the axial direction of the exhaust pipe located on both sides of the key groove in the axial direction of the exhaust pipe, and the other is provided with a long hole in the axial direction of the exhaust pipe. is provided with a guide pin that is slidably fitted into the elongated hole, a pair of links are pivotally supported on the pedestal at positions separated from each other in the axial direction of the exhaust pipe, the free ends of these links are connected to each other, and the link and an end cover provided at the end of the exhaust pipe, which are connected by a tension rod.