JPS646889Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a filter device used in a hydraulic circuit or the like.

[Technical background of the invention and its problems]

For example, in a hydraulic circuit that drives a hydraulic cylinder, a filter is provided in the middle of a pipe through which oil flows in order to remove foreign substances contained in the oil. This filter allows oil to pass through a filter element provided inside a filter case connected to a pipe line.

Therefore, in this filter, when the filter element becomes clogged due to accumulation of foreign matter trapped in the filter element, the filter element is removed from the filter case and cleaned or replaced. In this case, it is necessary to stop the operation of the hydraulic circuit, drain the oil inside the filter case, and then open the filter case and take out the filter element.
For this reason, a stop valve is provided on at least one of the front and rear sides of the filter, and the stop valve closes the pipe line connected to the filter case to prevent oil from flowing out from the pipe line to the filter case.

FIG. 1 shows an example of a hydraulic circuit provided with a filter and a stop valve. Oil in an oil tank 1 is supplied to a hydraulic cylinder 3 by a pump 2 to drive a piston 4 of the hydraulic cylinder 3, and oil discharged from the hydraulic cylinder 3 is returned to the oil tank 1.
A pipe line that supplies oil from the oil tank 1 to the hydraulic cylinder 3 is provided with a filter 5 and stop valves 6, 6 connected to the front and rear sides thereof, and a pipe line that returns oil from the hydraulic cylinder 3 to the oil tank 2 is provided with a filter 5 and stop valves 6, 6 connected to the front and rear sides thereof. A filter 7 and a stop valve 8 connected to the front side thereof are provided.

However, in conventional filters, the stop valve is provided separately from the filter, and the filter case and the stop valve are connected through a connecting pipe. For example, as shown in FIG. 1, a filter 5 and a stop valve 6,
6, a filter 7 and a stop valve 8 are connected by connecting pipes 9, respectively.

For this reason, the number of parts required to connect the filter and the stop valve increases, and the piping work to install the filter also requires time and effort, making it uneconomical.
Furthermore, there is a drawback that a space is required for connecting a connecting pipe between the filter and the stop valve.

[Purpose of invention]

This invention was made based on the above circumstances,
The present invention provides a filter device that simplifies the structure and piping work for connecting a stop valve to the filter and reduces space.

[Summary of the idea]

The filter device of the present invention includes a filter element, a filter case that houses the filter element, a lid of the filter case, and a stop valve attached directly to the fluid flow port of the filter case. A ring-shaped valve case that is screwed into contact with the liquid flow port of the case, a valve shaft that is rotatably installed in the valve case, and a valve body that is rotated by the valve shaft to open and close the valve. It has the following. That is, by attaching the stop valve directly to the filter case, a connecting pipe connecting the stop valve and the filter is not required.

[Example of idea]

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

2 to 4 each show an embodiment of the filter device of the present invention.

In the figure, reference numeral 11 denotes a filter case in the shape of a cylinder with an open top and a bottom.The filter case 11 has an inlet 12, which is a fluid inflow port, at the top of one side, and a fluid outflow port at the top of the other side. Outlet ports 13 are respectively formed. A drain outlet 14 is formed at the bottom of the filter case 11, and this is connected to a screw plug 1.
It is blocked by 5. The opening of the filter case 11 is closed by fitting a lid 16.
6 is fixed to the filter case 11 with bolts 17. Inside the center of the lid 16 is a communication hole 1 that communicates the inside of the filter case 11 with the outlet 13.
8 is formed. A cylindrical filter element 19 is housed inside the filter case 11 and arranged vertically, and the filter element 19 has upper and lower support rings 20,
20, and the upper support ring 20 is supported by the lid 16.
is fixed. The space between the filter element 19 and the peripheral wall of the filter case 11 communicates with the inlet 12, and the internal space of the filter element 19 connects with the outlet 13 via the flow hole 18.

In addition, the inlet 1 formed in the filter case 11
2 and the outside of the outlet 13 are stop valves 21 and 2, respectively.
1 is directly attached. This stop valve 21, 2
Reference numeral 1 denotes a butterfly-shaped valve, and each has the same configuration, so a description will be given by taking a stop valve 21 attached to the inlet 12 as an example. 22 is a ring-shaped valve case,
This is disposed outside the inlet 12 on the same axis as the inlet 12, and is fixed by a bolt 23 in contact with the outer end surface of the opening of the inlet 12. Valve case 2
A shaft hole 24 is formed in the shaft hole 2 along the diameter direction, and a recess 24a is formed in the upper part of the shaft hole 24. 25 is a disc-shaped valve body having the same diameter as the internal passage of the valve case 22;
It is fixed and rotatable. Valve shaft 26
is rotatably inserted into the shaft hole 24 of the valve case 22, and the valve body 25 is inserted in the internal passage of the valve case 21.
It is fixed by penetrating the center part of the. Therefore, when the valve shaft 26 rotates, the valve body 25 also rotates together.
The upper part of the valve shaft 26 is inserted into a shaft support cylinder 27 that is screwed into the recess 24a of the valve case 22 via an O-ring 28. Valve shaft 26 protruding from shaft support cylinder 27
The upper end of the lever 30 passes through the base end of the operating lever 30 via the seat 29, and the operating lever 30 is held down from above by a nut 31. The operating lever 30 is arranged above the valve case 22 and rotates the valve shaft 26. A ring-shaped holding flange 32 is disposed in contact with the outer end surface of the valve case 22, and this allows the bolt 33 to pass from the holding flange 32 through the valve case 22 and into the inlet 12 of the filter case 11.
It is fixed by screwing it into the end of the. That is, the presser flange 32 presses the valve case 22 from the outside and is fixed to the filter case 11. And this presser flange 32 has piping 3 for the hydraulic circuit.
4 are connected and fixed by welding. The stop valve 21 is configured in this manner.

In addition, in the figure, 35 is a seal ring, which is a joint between the filter case 11 and the lid 16, a joint between the inlet 12 and the outlet 13 of the filter case 11, and the valve case 22 of the stop valve 21, and the valve case 2.
2 and the presser flange 32,
Efforts are being made to prevent oil leakage.

The filter device configured in this manner is provided, for example, in the middle of a pipeline through which oil flows in the hydraulic circuit shown in FIG. Connect to piping 34, 34. Then, when operating the hydraulic circuit to flow oil into the pipe, each stop valve 2
1 and 21, the valve shaft 26 is rotated by operating the operating lever 30 as shown in FIGS. 2 and 3,
The valve body 25 is located at an open position along the axial direction of the valve case 22. Therefore, the internal passage of the valve case 22 is opened, and the pipes 34, 34 are connected to the stop valve 21,
It communicates with the inlet 12 and outlet 13 of the filter case 11 via 21 . As a result, oil flows from one pipe 34 through the retaining flange 32 of the stop valve 21 on the inlet side and the internal passage of the valve case 22, and then passes through the inlet 12 of the filter case 11, and passes through the filter element 19 inside the filter case 11.
flows into the space surrounding the area. Furthermore, the oil passes through the filter element 19 and enters its internal space, and in this process foreign substances contained in the oil are removed. The oil then flows through the flow hole 18 of the lid 16 and the outlet 13 of the filter case 11, passes through the internal passage of the valve case 22 and the presser flange 32 in the stop valve 21 on the outlet side, and flows out into the other pipe 34.

Therefore, when cleaning or replacing the filter element 19 that has become clogged due to adhesion of foreign matter in the oil, the operation of the hydraulic circuit is first stopped. Next, each stop valve 21 on the inlet side and the outlet side,
21 rotates the valve shaft 26 at an angle of 90 degrees using the operating lever 30, and positions the valve body 25 from the open position to the closed position in a direction perpendicular to the axis of the valve case 22. Therefore, since the internal passage of the valve case 22 is closed by the valve body 25, the filter case 11
The inlet 12 and outlet 13 and each piping 34, 3
4 is cut off by each stop valve 21, 21. This prevents flow from flowing out into the filter case 11 from the pipes 34, 34. In this state, the screw plug 15 of the drain outlet 14 formed at the bottom of the filter case 11 is removed, and the oil inside the filter case 11 is drained from the drain outlet 14. Next, the bolt 17 is loosened, the lid 16 is removed from the opening of the filter case 11, and the filter element 19 is taken out from the opening of the filter case 11. Furthermore, the filter element 19 that has been cleaned or replaced is removed from the filter case 1.
1, the lid 16 is fixed to the opening of the filter case 11, and the stop valves 21, 21 on the inlet side and the outlet side are opened.

In addition, in the embodiment described above, the valve case 22 of the stop valve 21 is held down and the filter case 11 is held down by the flange 32.
Although the valve case 22 is fixed to the inlet 12 and outlet 13 of
You can just tighten the bolts.

In the embodiment, the inlet 12 of the filter case 11
Although the stop valve 21 is attached to both the inlet 12 and the outlet 13, the stop valve 21 may be attached only to either the inlet 12 or the outlet 13.

In the embodiment, a butterfly valve is used as the stop valve, but a ball valve may also be used. In this case, a ball-shaped valve body having a communication hole is rotatably provided in the internal passage of the valve case, and the valve stem is used to position the valve body to open the internal passage of the valve case. The valve opening/closing operation is performed by rotating the valve body into a position parallel to the axis of the case) and a position where the internal passage is closed (a position where the flow hole of the valve body is perpendicular to the axis of the valve case).

[Effect of idea]

As explained above, according to the filter device of the present invention, the stop valve that shuts off between the filter and the pipe line is directly attached to the flow port of the filter case, so that the flow port and the stop valve are connected. The number of parts can be reduced as there is no need for a connecting pipe to connect the valve to the filter, and there is no need to connect the connecting pipe, simplifying the connection work between the flow port and the stop valve, improving economic efficiency. Space can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of a hydraulic circuit provided with a filter and a stop valve, FIGS. 2 to 4 each show an embodiment of the filter device of the present invention, and FIG. 3 is a sectional view taken along the line AA in FIG. 2 showing the stop valve in an open state, and FIG. 4 is a sectional view taken along the line AA in FIG. 2 showing the stop valve in the closed state. 11... Filter case, 12... Inflow port, 1
3... Outlet, 14... Drain outlet, 16...
Lid, 19... Filter element, 21... Stop valve, 22... Valve case, 25... Valve body, 26...
Valve stem, 30...operation lever, 32...presser flange, 34...piping.

Claims (1)

[Scope of utility model registration request] A filter element, a filter case that accommodates the filter element and has an inflow port and an outflow port for liquid passing through the filter element, and an opening for taking in and out the filter element, and an opening of the filter case. and a stop valve that is directly attached to the outside of at least one of the flow ports of the filter case, and the stop valve is screwed into contact with the outer end surface of the flow port of the filter case. A ring-shaped valve case, a valve shaft rotatably inserted and supported by the valve case, and a valve body provided inside the valve case and rotated by the valve shaft to open and close the valve. A filter device.