JPS5996427A - Mixing elbow - Google Patents

Abstract

PURPOSE:To reduce the size and weight of a mixing elbow by wrapping an inner cylinder made of plate material for an exhaust passage of an engine with a split type outer cylinder made of plate material except the end of the entrance side for forming a cooling water passage. CONSTITUTION:A inner cylinder 11 made of stainless with an exhaust passage 10 formed inside is wrapped by an outer cylinder 13 except an end part 12 on the entrance side. The outer cylinder 13 is constructed of a stainless plate to be throttled and divided into two parts 20 and 21; its upper end is closed by an end wall 22, and to its lower end, an exit pipe 23 is welded. The inner cylinder 11 is penetrated through a hole 25 of the outer cylinder part 21, and the inside of the hole 25 is hermetically welded or brazed to the inner cylinder 11. Between the inner cylinder 11 and the outer cylinder 13, a cooling water passage (sea water) 26 is formed to conduct the sea water taken in from a sea water inlet 27. This construction permits to reduce the size and the weight of an elbow by making inner and outer cylinders of plate materials.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing elbow installed in the middle of an exhaust path of a marine engine or the like.

Mixing elbows are generally used to cool and muffle exhaust gas using seawater, and conventional mixing elbows have a structure as shown in Figure 1. In FIG. 1, which is a vertical cross-sectional view, the inner cylinder 2 forming the exhaust passage 1 has an outer cylinder 4 with an inlet side end 8 remaining.
A seawater passage is formed between the inner cylinder 2 and the outer cylinder 4. The inner cylinder 2 is provided with a 7-lunge 6 (Fig. 2: 1-1 arrow view in Fig. 1) at the tip of the end 8, and the flange 6 is connected to an exhaust outlet of a supercharging port (not shown). It has become so. The outer cylinder 4 has a seawater-inlet lower portion near the end 3, and the outer cylinder end 8 is brazed to the inner cylinder 2 near the input lower. However, according to the conventional product shown in Fig. 1, the inner cylinder 2 and outer cylinder 4 are cast products, so the thickness is T9.
It is unavoidable that the size of the device becomes larger, resulting in an increase in overall size and weight. In particular, when the inner cylinder 2 and the outer cylinder 4 are made of cast iron, they are easily corroded, so in order to obtain the specified durability, the thickness and To should be extremely large (for example, 6 to 8
mm) Ic. Furthermore, if the inner tube 2 and the outer tube 4 are made of brass, the thicknesses to and To can be reduced, but in that case, the material cost increases. Furthermore, since it is necessary to use silver solder to braze the end portion 8 to prevent corrosion, brazing is also expensive. Moreover, it is necessary to perform machining on the end portion 8 and the inner cylinder 2 portion in advance for brazing, and the machining is also time-consuming. The problems related to brazing described above can be solved by integrally molding the inner tube 2 and the outer tube 4, but in the case of integral molding, the following problems occur due to the core. That is, it is necessary to set the sw' of the seawater passage 5 to a large value, for example, B mm or more, which increases the outer diameter and weight of the outer cylinder 4. Also, it is necessary to provide a boss just to support the core, which makes manufacturing difficult.
The weight and material cost will further increase due to the boss.

The present invention has a structure with one inner cylinder in order to solve the above-mentioned problems, and will be explained as follows with reference to the drawings.

FIG. 3 is a front view of the embodiment of the present invention, and FIG. 4 shows that all but the third part are enclosed by the outer cylinder 18 as described below.

The inner cylinder 11 is, for example, a pipe made of a stainless steel plate with a thickness t = 1.5 mm, the inlet side end 12 extends generally horizontally, the middle part 15 curves smoothly downward, and the lower outlet side end Section 14 extends generally vertically. A joint flange 16 is fitted and welded to the outer peripheral surface of the tip of the inlet end 12 . The flange 16 is a portion that is fixed to the exhaust outlet portion of the supercharger turbine 18 with bolts 17 as shown in FIG. 5, and has bolt insertion holes 20 at three corners as shown in FIG. 8. The hole 20 is an elongated hole having an arc shape that is aligned with the center 0 of the inlet end 12, so that the mounting attitude of the flange 16 with respect to the turbine 18 can be adjusted.

As shown in FIG. 4, the outer cylinder 13 is a two-part structure consisting of two parts 20 and 21, the upper end of which is closed by an end wall 22, and the outlet vibrator 23 is connected to the open edge of the lower end by welding. ing. The image portion 20.21 has a thickness T = 1, for example.
．． It is a draw-molded product of 5 mm stainless steel plate, and is welded at the mating surface A-A perpendicular to the center O, and the part 20
．． A bent flange 28 for welding is formed on 21 along the mating surface A-A.

The inner cylinder 11 has a hole 25 provided in the upper part of the vertical wall 24 of the section 21.
The curved middle part 15 and outlet side end part 14 of the inner cylinder 11 enter and extend from the upper part to the middle part of the outer cylinder 13. The inner circumferential edge of the hole 25 and the inner cylinder 11 are tightly fixed by welding or brazing the entire circumference. 26 is a seawater passage formed between the inner cylinder 11 and the outer cylinder 13, and a seawater inlet 27 communicating with the seawater passage 26 is formed in the upper part of the outer cylinder 18. The inlet 27 is formed by a notch provided in the mating surface (green) of the portion 20.21, and one end of an inlet vibrator 29 is fitted into the inner peripheral edge of the inlet 27 and welded in a sealed state. As shown in FIG. 8, the pipe 29 projects approximately horizontally from the outer cylinder 13 to the left in FIG. 3, and as shown in FIG.
The inlet is connected to, for example, the seawater outlet of the lubricating oil cooler 31 via a seawater pipe 80.

The lower part 32 of the outer cylinder 13 is located on the right side in Fig. 6 (the engine body 33
The pipe 23 extends diagonally downward. 7 and 8 are sectional views taken along the line ■-■ and ■-■ of FIG. 3, respectively. As shown in FIG. 7, the upper part of the outer cylinder 18 has a generally square cross section with rounded corners 85. Ori,
Recesses for holes 25 and inlets 27 are formed in the flat vertical wall 24. As shown in FIG. 8, the cross-sectional shape of the outer cylinder 13 becomes nearly circular as it goes downward, and the lower end is completely circular and connected to the pipe 23 as shown in FIG. The pipes 23 and 29 are made of stainless steel pipes having the same thickness t and T as the inner tube 11 and the outer tube 13, for example. Although not shown, the pipe 28 is connected to an exhaust pipe extending overboard, and connects the turbine 18 (FIG. 5) to the passage 10.
The exhaust gas is discharged to the outside of the ship through the pipe 23 and the like together with the seawater that has flowed into the passage 26 from the inlet 27.

As explained above, according to the present invention, the exhaust passage 1 is provided inside.
The inner cylinder 11 made of a plate material forming the inner cylinder 11 is wrapped in the outer cylinder 13 made of a plate material which is divided into two, leaving the inlet side end 12, and a seawater passage 26 is formed between the inner cylinder 11 and the outer cylinder 13. A seawater inlet 27 communicating with 26 is provided in the outer cylinder 13. In this way, in the present invention, both the inner cylinder 11 and the outer cylinder 13 can be formed from plate materials, so the size and weight can be reduced compared to conventional cast products, and there is no need to use expensive materials such as brass. Therefore, material costs can also be reduced. Furthermore, since there is no need to use a core, the width W of the seawater passage 26 can be reduced, and a boss dedicated to supporting the core is not required, and the size and weight can also be reduced in these respects. Since stainless steel plates can be used as the material for the inner cylinder 11 and the outer cylinder 13, corrosion resistance can also be sufficiently increased. Furthermore, since the outer cylinder 13 is divided into two parts, manufacturing is easy. That is, the eighth
As shown in the figure, the outer cylinder 18 has a large outer diameter and a small radius of curvature R, so if you try to bend the pipe to form the outer cylinder 13, a large and special bender will be required, increasing the equipment cost. Also, there is a risk of wrinkles or cracks forming on the outer cylinder surface.
In the present invention, it is only necessary to form the parts 20 and 21 by drawing and fit them together, so there is no need for large and special equipment, reducing equipment costs, and there is no risk of wrinkles or cracks appearing in the outer cylinder 13. .

As in the illustrated embodiment, port insertion hole 20 of pufunji 16
By making the pipe 23 a long hole, the installation posture of the mixing elbow can be adjusted, and the position of the pipe 23 can be adjusted in consideration of the position of other equipment.
and the pipes that follow it can be installed in the optimal position.

In addition, when embodying the present invention, the inner cylinder 11 can also have a two-piece structure. The present invention can also be applied to the case where the inner cylinder 11 is connected directly to the exhaust manifold 37 (FIG. 6) instead of to the turbine 18.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of the conventional example, FIG. 2 is a view taken from the direction of the arrow T in FIG. 1, FIG. 3 is a front view of the embodiment of the present invention, and FIG. The sectional view, Figures 5 and 6 are side and front views of the mixing elbow with the engine installed, and Figures 71 and 8 are the ■-■ and Xl of Figure 3, respectively.
1li-vlli sectional view. 10...exhaust passage,
11... Inner cylinder, ]2... Inlet side end, 13... Outer cylinder, 26... Seawater passage, 27... Seawater inlet Patent applicant Yanmar Diesel Co., Ltd. 1. □ Agent Patent attorney 1,
; Figure 3 Figure 7 Figure 4 Figure 8

Claims (1)

[Claims] The inner cylinder that forms the exhaust passage inside is separated by two parts, leaving the inlet end.
A mixing elbow characterized in that the mixing elbow is wrapped in an outer cylinder having a split structure, a cooling water passage is provided between the inner cylinder and the outer cylinder, and a cooling water inlet communicating with the cooling water passage is provided in the outer cylinder.