JPH0225445Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a switching device for a double strainer used for fuel oil or lubricating oil for ships or land-based engines, boilers, etc.

[Prior art]

In a compound strainer equipped with a socket formed by press-fitting an inverted conical valve body 3 into an inverted conical turning hole 2 of a valve housing 1, fluid such as fuel oil or lubricating oil is normally supplied at about 5 atmospheres. It is necessary to open the lid of the overchamber in order to drain the water into one strainer tube and take out the other strainer tube for cleaning or replacing it with a new one. For this reason, the valve body fitted into the pivot hole 2 must be in close contact with the valve housing to prevent fluid from leaking.

FIG. 3 is a cross-sectional view of the main parts of a double strainer switching device according to JIS F 7208. In this device, an inverted conical valve body 3 is rotatably fitted into an inverted conical pivot hole 2 of a valve housing 1, and the tip of an operating shaft 4 protruding from the upper surface of the valve body 3 , the central through holes of the base 5a and the upper part 5b of the Kotoku upper lid 5 fixed to the valve housing 1 are made to protrude through, the screw ring 7 is screwed into the through hole of the upper part 5b, and the screw ring 7 is screwed into the hole. A lift screw 8 is screwed into the hole, and the tip of the operating shaft 4 passes through the through hole of the lift screw 8. A handle 9 for pulling up or lowering the handle is attached to the lift screw 8, and the valve body 3 is rotated on the operating shaft 4 between the base 5a and the upper part 5b of the upper lid of the handle to change the angle. The Kotsuku switching handle 10 is installed. A hexagonal nut 1 is attached to the tip of the operating shaft 4.
1 is screwed on.

When using this device to change the kottoku,
When the pull-up handle 9 is rotated to the left, the lift screw 8 moves upward, and its upper surface touches the hexagonal nut 1.
1, the operating shaft 4 is lifted, and therefore the valve body 3 is lifted and can be rotated. Next, after changing the angle of the valve body 3 by rotating the Kotuku switching handle 10 to the right or left, when the Kotuku lifting handle 9 is turned to the right, the lift screw moves downward, and its lower surface becomes the operating shaft. , the operating shaft is pushed down, and accordingly, the valve body 3 is pulled down and tightly press-fitted into the pivot hole 2, completing the switching operation.

[Problems that need to be solved by invention]

In the above-described switching device, in order to press fit the valve body 3 into the turning hole 2 and tightly fit it into the valve housing 1, it is necessary to rotate the pulling handle 9 with a considerably large force and pull up the valve body 3. At this time, in addition to the frictional force of the threaded part between the lift screw 8 and the screw ring 7, there is a Frictional force due to surface contact between the lower surface and the operating shaft is also added, and a very large force is required. Furthermore, when the valve body 3 is completely pulled up, there will be contact between the valve body 3 and the Kotsuku upper cover 5, or between the Kotsuku switching handle 10 and the screw ring 7, and the friction force due to the contact surface pressure will cause the Kotsuku switching handle to close. The disadvantage is that it requires a very large force to rotate.

In the Kotsuku switching device disclosed in Utility Model Publication No. 52-31935, a washer or the like whose surface is coated with a polymeric material having a low coefficient of friction such as Teflon is interposed in the above-mentioned contact surface. This method cannot be practically used in large strainers because the allowable contact surface pressure is low and a large contact area ratio is required.

[Means for solving problems]

Press-fit the inverted conical valve body into the inverted conical turning hole of the valve housing, pull up the valve body by rotating the Kotoku pull-up handle and the Kotuku switching handle, and switch the Kotoku by rotating and lowering it. In the Kotoku switching device of a double strainer, the tip of the operating shaft protruding from the top surface of the valve body penetrates, and a bearing is attached to at least one of the upper and lower contact surfaces of the lift screw that locks the Kotuku pull-up handle. 12, it is possible to contact the operating shaft and/or a member fixed to the tip of the operating shaft.

[Effect]

It reduces the force of contact friction between the upper surface of the lift screw and the lower surface of a member such as a hexagonal screw, and/or the force of contact friction between the lower surface of the lift screw and the operating shaft and/or the lower surface of the screw ring and the operating shaft or switching handle, allowing for easy lifting. Smooth and easy lifting, rotation, and lowering of the valve body using the handle and switching handle.

〔Example〕

The details of this invention will be explained based on the embodiments shown in the drawings.

In the drawing, 1 is a valve housing, 2 is an inverted conical-shaped turning hole provided in the valve housing 1, and 3 is a valve body,
It has an inverted conical shape that tightly fits into the turning hole 2. An operating shaft 4 is provided protruding from the center of the upper surface of the valve body 3. In the drawing, the operating shaft 4 is fixed to the valve body 3 with a nut, but the operating shaft 4 may be integrally formed with the valve body 3. At the top of the valve housing 1 is a top cover 5.
is installed through the sealing ring 6. The Kotoku upper lid 5 has a base plate 5a connected to the valve housing 1 and an upper part 5b that covers the upper part of the base plate 5a.
A through hole is provided in the center of each of the operating shafts 4.
passes through these two through holes, and its tip protrudes above the top 5b of the top cover 5. base 5
The inner surface of the through hole a is in close contact with the circumferential surface of the operating shaft 4, and a sealing ring 6 is further interposed to prevent fluid from leaking. A screw is carved into the inner surface of the through hole of the upper part 5b, a screw ring 7 having a screw hole is screwed into this through hole, a lift screw 8 is screwed into the screw hole of the screw ring 7, and , the operating shaft 4 passes through the through hole of the lift screw 8. A lift handle 9 is attached to the part of the lift screw 8 that projects above the upper part 5b of the upper lid 5, and a switch switch handle 10 is fixed and attached to the operating shaft between the upper part 5b and the base plate 5a. The lift handle 9 has a structure in which the lift screw 8 also rotates when it is rotated horizontally. A hexagonal screw 11 is screwed onto the tip of the operating shaft 4. Instead of screwing in a hexagonal screw, a pin or the like may be inserted and fixed into the operating shaft.

Thus, a bearing 12 is interposed between the lower surface of the hexagonal screw 11 and the upper surface of the lift screw 8, and between the lower surface of the lift screw 8 and the corresponding surface of the operating shaft 4, or either one of them. The lower bearing 12 is designed to contact the lower surface of the screw ring 7 before the valve body 3 is pulled up and its upper surface contacts the lower surface of the base plate 5a of the top cover 5.

When using this device, when the lifting handle 9 is rotated to the left, the lift screw 8 is rotated.
Since the lift screw 8 is connected to the top cover 5 through the screw ring 7, the lift screw moves upward and its upper surface pushes up the hexagonal screw via the bearing 12, so that the operating shaft 4 is lifted upward. is,
Therefore, the valve body 3 is lifted up and the fitting into the pivot hole 2 is loosened, and it becomes possible to rotate left and right. At this time, the upper bearing 12 is first squeezed between the upper surface of the lift screw 8 and the lower surface of the hexagonal screw 11, and then the lower surface of the screw ring 7 comes into contact with the lower bearing 12, and the valve body 3 is pressed against the upper surface of the hexagonal screw 11. This prevents the lid 5 from coming into contact with the lower surface of the substrate 5a. Next, when the switching handle 10 is horizontally rotated to the left or right to change the angle of the valve body 3, the angle of the fluid outlet in the valve body 3 changes. During these horizontal rotations, the bearing 12 acts with a small rolling friction force, so
Rotates easily with little force. When the angle change of the valve body 3 is completed, when the Kotoku pull-up handle 9 is rotated to the right, the lower surface of the lift screw 8 pushes down the operating shaft 4 via the bearing 12, contrary to when the valve body was pulled up. The valve body 3 is pushed down and press-fitted into the pivot hole 2, and the switchover is completed.

〔effect〕

In the present invention, since a bearing is interposed on the contact surface where friction occurs, the frictional force is greatly reduced, and the force required to pull up, push down, and rotate the operating shaft and valve body is extremely small. In the conventional example,
For example, if the inlet diameter of the strainer is 200 mm, the above-mentioned lifting or pushing force will require 5 to 8 tons, so the force to rotate the Kotuku pulling handle is the maximum.
It is very large, weighing 100 to 200 kg, and is hit with a hammer or using power, but according to this invention, it weighs about
Power can be reduced by 30-50%. In addition, since the allowable surface pressure can be increased, it can be applied to large strainers, and conversely, it is possible to downsize the parts. The structure is simple and can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an embodiment of this invention, FIG. 2 is a sectional view taken along line AA, and FIG. 3 is a sectional view of a main part of a conventional example. 1...Valve housing, 2...Swivel hole, 3...Valve body, 4...
...Operating shaft, 5...Kottoku upper cover, 7...Screw ring, 8...Lifting head screw, 9...Kottoku lifting handle, 10...Kottoku switching handle, 11...Hexagonal screw, 12...Bearing.

Claims (1)

[Scope of utility model registration request] Press-fit the inverted conical valve body into the inverted conical turning hole of the valve housing, pull up the valve body by rotating the Kotoku pull-up handle and the Kotuku switching handle, and switch the Kotoku by rotating and lowering it. In the double strainer switching device, the tip of the operating shaft 4 protruding from the upper surface of the valve body 3 is inserted into at least one of the top and bottom of the lift screw 8 to which the Kotuku pull-up handle 9 is engaged. This switching device for a double strainer is characterized in that a bearing 12 is interposed on the contact surface to allow contact with an operating shaft 4 and/or a member 11 fixed to the tip of the operating shaft 4.