JPH0488271A - Flow passage selecting valve device - Google Patents

Abstract

PURPOSE:To improve the sealing performance between a valve seat part without being influenced by the installation error by installing a valve body which can be center-adjusted, on both the side surfaces of a flow passage selecting valve which is pivotally installed in the branched part of two flow passages. CONSTITUTION:The plate 8 of a flow passage selecting valve 25 is pivotally installed in swingable manner at a branched part 7 of an exhaust passage 2 of an automobile and a bypass 4. Valve bodies 15 and 16 are installed on the plate 8 by bolts 17 and 18. Bolt insertion holes 15b and 16b are formed into each dimension permitting the relative shift of the valve bodies 15 and 16 for the plate 8. The valve seat parts 19 and 20 formed on an exhaust passage 2 and a bypass 4 and the outer peripheral edges 15a and 15b of the valve bodies 15 and 16 are formed into each tapered surface or spherical surface, and since the relative shaft is permitted, the valve is surely sealed by the center adjusting action. Further, even if the installation error of the valve body exists, the influence can be suppressed, and easy manufacture is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flow path switching valve device, and particularly to a flow path switching valve device suitable for switching a bypass path provided in the middle of an automobile exhaust path.

[Conventional technology]

Fig. 3 shows the exhaust path of an automobile equipped with a known exhaust purification device such as the Utility Model Publication No. 58-66017, where 1 is the engine, 2 is the exhaust path, and 3 is the middle of the exhaust path 2. 4 is a bypass path that bypasses the exhaust gas purification device M3, and 5 is a silencer provided at the rear of the exhaust path 2.

A flow path switching valve 6 is provided at each branch portion of the exhaust path 2 and the bypass path 4, and is configured to switch the exhaust flow path depending on the status of the exhaust purification device 3.

[Problem to be solved by the invention]

However, due to errors in mounting the flow path switching valve 6 and manufacturing errors in the valve seats of the exhaust path 2 and bypass path 4, the centers of the valve body and valve seat of the switching valve do not match, and the valve seat It was not possible to maintain sufficient sealing performance when the vehicle was seated on the vehicle, and there was a risk that the amount of exhaust gas leaking would increase.

The present invention was invented in order to solve the above-mentioned conventional problems, and the installation of the flow path switching valve is not influenced by factors such as errors and manufacturing errors of the valve seats of each of the two flow paths.
It is an object of the present invention to provide a reliable flow path switching valve device that maintains sufficient sealing performance when seated on the valve seat portion of any flow path.

[Means for Solving the Problems] In order to achieve the above object, the flow path switching valve device of the present invention is provided with a flow path switching valve device that is swingably pivoted at a branch part of two flow paths, and has a flow path switching valve on each side of the flow path switching valve. The valve body is characterized in that the valve body is independently attached to the valve seat portion of each flow path so as to be freely aligned.

[Effect]

The operation of the flow path switching valve device of the present invention having the above configuration is as follows.

In other words, each valve element of the flow path switching valve is installed independently while aligning with the valve seat, so the installation of the flow path switching valve is subject to errors and manufacturing errors in the valve seat of each flow path. Since each of the valve bodies reliably seats on the respective valve seat portion without being affected by the above, sufficient sealing performance is obtained and fluid leakage is prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Note that parts and devices that are the same as those of the conventional example shown in FIG. 1 are designated by the same reference numerals. FIG. 1 and FIG. 2 show the main parts of an exhaust path of an automobile as a first embodiment of the present invention, in which a plate 8 of a flow path switching valve 25 is located at a branch 7 between an exhaust path 2 and a bypass 4. is pivotally mounted so that it can swing freely. The base end of the plate 8 has a screw 1 attached to a rotation shaft 11 that is rotated by an intermediate arm 10 that interlocks with an actuator 9, which will be described later.
It is fixed by 2. In the middle part of plate 8,
Through holes 8a and 8b for bolts 17 and 18 are formed to match the number of bolts provided. 15.16 is plate 8
The valve body is attached to the outer peripheral edge portions 15a and 16a of the outer surface.
are tapered or spherical in accordance with the tapered or spherical seating surfaces of the valve seats 20.19 provided on the inner circumferential surfaces of the bypass passage 4 and the exhaust passage 2, and each has a bolt. Insertion holes 15b, 16b and bolt holes 15c, 1.6
c is formed according to the number of bolts installed.

Further, the bolt insertion holes 15b and 16b have bolts 18
．． The valve bodies 15 and 16 are sized to be movable relative to the plate 8 when the head of the valve body 17 is inserted.

Here, each valve element 15, 16 is attached to the plate 8 of the flow path switching valve 25 as follows.

First, when attaching one valve body 15 to the plate 8,
Attach the valve body 15.16 to the bolt 17.18 and nut 17a, 1
8a, the plate 8 which has been temporarily fixed is swung clockwise around the rotating shaft 11, and when the valve body 15 is accurately seated on the valve seat 20 of the bypass passage 4, the bolt 17 and nut 1 are tightened.
7a to fix the valve body 15 to the plate 8.

Next, when attaching the other valve body 16 to the plate 8, the plate 8 is swung counterclockwise around the rotating shaft 11, and the valve body 16 is accurately seated on the valve seat 19 of the exhaust path 2. At this position, tighten the bolt 18 and nut 18a to fix the valve body 16 to the plate 8.

This work of aligning and attaching the valve bodies 15, 16 to the plate 8 can be easily accomplished by making the vicinity of the branching portion 7 of the exhaust gas 2 into a split type as shown in FIG.

On the other hand, the actuating rod 9 of the actuator 9 is connected to the shaft end 11a of the rotating shaft 11 via the lever 21 and the intermediate arm 10.
connected to a.

A flow path switching valve 25 is disposed between the spring mounting portion 2a of the exhaust path 2 and the lever 21, and the flow path switching valve 25 is connected to the valve seat portion 20 of the bypass path 4.
A spring 23 is attached to urge the seat to sit.

When performing combustion treatment of unburned components inside the exhaust purification device 3,
When actuator 9 is activated.

When the rod 9a is pulled back, the lever 22 rotates against the spring 23 via the intermediate arm 10, and the first rotation shaft 11 is rotated counterclockwise in FIGS. 2 and 3. The switching valve 25 is configured to be switched from the closed position of the bypass passage 4, indicated by a solid line in FIG. 1, to the closed position 1125a of the exhaust passage 2, indicated by a two-dot chain line.

Next, the combustion process of the unburned components in the exhaust purification device 3 is completed,
When the actuator 9 is deactivated, a return spring (not shown) built into the actuator and the spring 2
3, the flow path switching valve 25 is switched to the position shown by the solid line in FIG. 1, that is, the bypass path 4 is closed, and the exhaust path 2 is opened again.

In the flow path switching valve device configured and operated as described above, both valve bodies 15 and 16 of the flow path switching valve 25 are aligned with the valve seats 2o and 19 in advance with respect to the plate 8.
Since it is designed to be installed, the flow path switching valve 2
5 may be installed due to errors or valve seat part 19 of exhaust path 2 or bypass path 4.
Even if there is a manufacturing error in the valve seat 20, both valve bodies 15 and 16 of the flow path switching valve 25 are securely seated against their respective valve bodies 20 and 19, so that sufficient sealing performance is obtained and the gas Leakage is prevented.

In addition, although the above embodiment describes an example in which the flow path switching valve is installed at the branch part of the exhaust path of an automobile and its bypass path, it is not limited to this example as long as it is a fluid path. Of course.

〔Effect of the invention〕

The flow path switching valve device of the present invention has valve bodies independently aligned with the valve seat portions of each flow path on both sides of a flow path switching valve pivotably pivoted at a branching portion of two flow paths. Since each valve body of the flow path switching valve can be installed independently to measure alignment with the valve seat, the installation of the flow path switching valve is free from errors and each flow path. Since each valve element is securely seated on the respective valve seat without being affected by manufacturing errors of the valve seat, sufficient sealing performance can be obtained;
A reliable flow path switching valve device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of the main part showing a first embodiment of the present invention, FIG. 2 is a side view of the main part of the same embodiment, and FIG. 3 is a schematic diagram showing the exhaust of a car as a conventional example. . 2... Exhaust path, 3... Exhaust purification device, 4... Bypass path 7... Branch, 8... Plate, 9... Actuator 11... Rotation shaft, 15.16 ...Valve body, 17.18...Bolt, 19.2o...Valve seat part 2
5...Flow path switching valve Fig. 2 Fig. 1 Fig. 3

Claims (1)

[Claims] A flow path switching device characterized in that a valve body is independently attached to both sides of a flow path switching valve pivotally attached to a branch portion of two flow paths so as to be freely aligned with the valve seat portion of each flow path. Valve device.