JP2000179336A - Balancing mechanism for damper of exhaust counterflow preventing device of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable balancing to be conducted without detaching a damper from a pivot portion, by attaching the damper through the pivot portion to an exhaust outlet, which also functions as a valve seat, of a tubular body receiving an exhaust gas, and by mounting to the damper a detachable weight for adjusting a seating force. SOLUTION: An exhaust counterflow preventing device 1 has an exhaust inlet 4 that is formed by the inner surface of a hole in an end plate 2 and the bonded portion of a tubular body 3 having, for example, a circular cross-section. The exhaust inlet 4 is connected through an exhaust pipe to an exhaust outlet of the internal combustion engine. The tubular body 3 of the exhaust counterflow preventing device 1 is cut approximately at 45 degrees at its outlet end, thereby forming an exhaust outlet 7. The exhaust outlet 7 also functions as a valve seat on which a valve portion 9 of a damper 8 is seated. A pivot portion 15 swingably supports the damper 8. Two annular weights 35, 36 are fixed to the tilted top surface of the valve portion 9 by using a weld bolt 34 attached thereto. At the end opposite to the valve portion 9, a weight 11 for adjusting a seating force is attached such that the weight 11 is positionally adjustable along a slotted hole 26 through which a bolt 28 extends.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention employs a system in which one or a plurality of engines are connected by connecting exhaust pipes of a plurality of diesel engines to a merging pipe and opening the merging pipe to the atmosphere directly or through a muffler or the like. The present invention relates to a damper balance adjustment mechanism of an exhaust gas backflow prevention device that prevents exhaust gas pressure from a running engine from flowing back into a stopped engine when the remaining engine is stopped and the remaining engine is operated.

[0002]

2. Description of the Related Art FIG. 5 is a longitudinal sectional front view of a conventional exhaust gas backflow preventer 1 when it is closed. The inlet 4 is connected to an exhaust gas outlet of an engine 6 via an exhaust pipe 5 concentric with the cylinder 3. The exhaust outlet 7 at the right end of the cylindrical body 3 cut at about 45 degrees also serves as a valve seat on which the valve body 9 of the damper 8 is seated, and extends upward from the upper end of the valve body 9 horizontally to the left. A damper valve body upper weight 11 having a weight determined at the design stage is welded to the upper surface of the portion 10, and a bearing 12 welded to the lower surface of the boundary between the valve body portion 9 and the valve body upper portion 10 via a bolt pin 13. The lower end of the support leg 14 is welded to the upper surface of the cylindrical body 3. The bearing 12, the bolt pin 13, and the support leg 14 form a pivot portion 15. Damper stopper 16 for determining the fully open position of damper 8
Are welded to the upper surface of the cylindrical body 3. On the right side of the end plate 2, for example, a left end plate 17 of a case 20 having a circular cross section is a bolt 1.
9. The exhaust outlet 22 of the end plate 21 which is fastened by the welding nut 24 and welded to the right end face of the case 20 is connected to a merging pipe (not shown...) Through an exhaust pipe 23. Inflow).

As described above, the damper 8 of the conventional exhaust gas backflow preventer 1 has the pivot portion 15 as a fulcrum, and the weight 11 is fixed to the upper portion 10 of the damper valve body so that the weight 11 cannot be removed. It opens in balance with the exhaust gas flow rate in the direction of arrow A, and when the engine is stopped, the damper 8 closes with a predetermined seating force, and has a function of preventing backflow so that exhaust gas from another engine does not enter the cylinder 3. Play. As described above, during the operation of the engine, the damper 8 of the exhaust gas backflow prevention device 1 is opened in balance with the exhaust gas flow rate, but is not well balanced with the exhaust gas flow rate.
Does not open, the damper valve body 9 and the valve seat (exhaust outlet 7) generate chattering noise, ...
And so on. When taking measures,
The mounting bolt pin 13 of the pivot part 15 is removed, the damper 8 with the weight 11 is removed, and the weight 11 is adjusted, then attached to the pivot part 15 to check the performance. Therefore, there is a problem that the adjustment man-hour and the manufacturing cost of the damper 8 with the weight are required.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the trouble of removing a damper from a pivot portion of an exhaust gas backflow prevention device during balance adjustment.

[0005]

SUMMARY OF THE INVENTION The present invention provides, through a pivot portion, a cylinder having an exhaust inlet into which exhaust gas of an engine flows, and an exhaust outlet also serving as a valve seat through which exhaust gas flows out from the inlet. A balance adjustment mechanism for an exhaust gas backflow prevention device damper, wherein a damper that can be seated and closed is attached to the exhaust outlet, and a weight for adjusting a seating force is detachably provided on the damper.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional front view of an exhaust gas backflow preventer according to the present invention, and the same reference numerals as those in FIG. In FIG. 1, the weight 11 has a vertical slot 26 extending in the left-right direction, and a hole 27 of the valve body upper portion 10.
Bolt 28, double nut 2
9 is fastened on the valve body upper part 10 so that the left and right positions can be adjusted. Of course, instead of the weights 11, weights having different weights prepared in advance may be fastened. The weight 11, the bolt 28, the nut 29, and the like form a damper valve body upper weight 30.

A strip 31 having holes 30 at upper and lower ends is formed on the upper surface of the valve body 9 inclined downward to the right.
And two annular weights 35 and 36 respectively fit into two upper and lower holes 33 of the valve body portion 9 and welding bolts 34 passing through the holes 30. A nut 37 is screwed to the upper end of the bolt 34.
The strip 31 is cut and raised between two vertically extending slits sandwiching the intersection P to form a hook hoop 38 for a hook (not shown) of a spring scale. Strip plate 31,
The weights 35 and 36, the bolts 34, the nuts 37 and the like form a damper valve body weight 39. The damper valve body upper weight 30 and the damper valve body weight 39 are arranged so that the valve body 9 is pressed against the valve seat (exhaust outlet 7) with a light seating force when the engine is stopped, so that the above-mentioned problem does not occur. The weight is determined. Incidentally, 45 in FIG. 5 is a drain plug.

As described above, first, the weight 11 on the upper side of the damper valve body is mounted with the bolts 28 and the nuts 29. Only the weight 11 is removed from the damper 8 without removing the mounting bolt pin 13 of the pivot portion 15, so that the weight of the weight is reduced. Adjustment was made possible. Further, for example, a hoop 38 is provided, and a spring scale is arranged in a direction perpendicular to the valve body 9 at a damper valve body weight mounting center point P, so that the load can be checked when the damper opens in the direction of arrow B at the time of manufacture. Further, a detachable and weight-adjustable damper valve body weight 39 is provided at several places in the center of the damper valve body 9. In the present invention, the nut 29 is loosened and the weight 1 is
A mechanism for finely adjusting the position of 1 and then tightening with the nut 29 is also included in the structure of "the weight is detachably provided". Of course, a circular hole having a size suitable for the bolt 28 may be employed instead of the long hole 26. Further, the fine adjustment mechanism of the damper valve body upper weight 30 shown in the figure can be adopted also for the damper valve body weight 39, but in this case, the arrow B
Since the center line of the acting force of the spring balance in the direction deviates from the fulcrum P, it is necessary to set when to measure the seating force (described later). The end plate 2 and the end plate 17 are fastened with a plurality of bolts 19 and welding nuts 24, and the end plate 17 has a large-diameter hole 18 for work.
It has. Reference numeral 25 in FIG. 5 is a bolt for fastening the joint between the exhaust backflow preventer 1 and the exhaust pipe 23. FIG. 2 shows a case where the hoop 38 and the center point P are on the center line 32 of FIG. 1 when the band plate 31 is finely adjustable (described above) (at the time of measuring the seating force when the damper starts to open, that is, at the time of load measurement). A mark 42 indicating the position of the band plate 31 is shown, and FIG. 3 shows an example of a positional relationship between the bearing 12 and the support leg 14. Instead of the hoop 38 in FIG. 1, any one of a ring, a hook, and a projection for attaching a spring scale can be fixed to the band plate 31.

When the above-mentioned problem is detected,
Stop the engine, remove the exhaust gas backflow preventer 1 from the exhaust pipes 5, 23 (FIG. 5), and insert a hand through the hole 18 or the exhaust outlet 22 to replace any or all of the weights 11, 35, 36, change. At that time, there is no need to remove the damper 8. In this case, the weight 11 is replaced with a heavy one, or the weight 11 is moved to the left in FIG. In the case of, the weight 11 is replaced with a lighter one, the weights 35 and 36 are replaced with a heavyer one, or both are performed.
Is moved rightward in FIG.

[0010]

According to the present invention, when a problem occurs that the damper 8 cannot be opened during the operation of the engine, for example, only the weight 11 on the upper side of the damper is removed from the damper 8, and the weight of the weight can be adjusted. The adjustment man-hour cost and the production cost are reduced. In addition, since it is possible to confirm that the damper starts to be opened at the time of manufacturing, it is possible to eliminate the problem that the damper does not open during operation of the engine, and to eliminate the cost of man-hours for adjustment and manufacturing on site. Further, when chattering occurs between the damper valve body 9 and the valve body seat (exhaust outlet 7) to generate noise, for example, the weight of the weight (damper valve body weight 39) attached to the center of the damper valve body 9 is used. Can be adjusted, so that local countermeasures can be made easier, and adjustment man-hours and manufacturing costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a schematic view taken along the line III-III of FIG. 2;

FIG. 4 is a front view of the damper of FIG.

FIG. 5 is a longitudinal sectional front view of a conventional example.

[Explanation of symbols]

 3 Cylindrical body 4 Exhaust inlet 6 Engine 7 Exhaust outlet (valve seat) 8 Damper 11 Weight 15 Pivot part 35 Weight 36 Weight

Claims (1)

[Claims] An exhaust inlet into which exhaust gas of the engine flows;
A damper that can be seated and closed is attached to the exhaust outlet via a pivot part on a cylinder having an exhaust outlet also serving as a valve seat through which exhaust gas flows out from the inlet, and a weight for adjusting the seating force is detachably attached to the damper. A balance adjustment mechanism for an exhaust backflow preventer damper of an engine.