JPH07194905A - Filter for liquid - Google Patents

Abstract

PURPOSE:To provide a filter for liquid in which a valve is operated automatically by the movement of a head cover, and a filter element can be exchanged simply and efficiently without overflow of liquid from a housing main body. CONSTITUTION:A valve attachment opening 4 is installed at the upper end of a filtration chamber 2, and a housing main body 1 having an introduction opening 5 and a discharge opening 6 which are connected to circuits A, B for liquid, a cylindrical valve 9 set in the valve attachment opening 4 to be able to rotate, and a head cover 31 which has a filter element 21 in its lower part and is fixed at a position turned by a specified angle after being inserted into the housing main body 1 in a manner in which it can be detached are installed on the side wall of the chamber 2. The cylindrical valve 9 is turned to be operated by the rotation of the head cover 31. Only when the valve 9 is opened, an introduction passage 38 communicating between the introduction opening 5 and the filtration chamber 2 of the housing main body 1 through the holes 9a, 9b of the cylindrical valve 9 and a discharge passage 39 communicating between the inside of the filter element 21 and the discharge opening 6 are formed on the head cover 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device for liquid filtration, which is mainly used for filtering and cleaning pressure oil in a hydraulic circuit of a lubricating oil or industrial hydraulic equipment.

[0002]

2. Description of the Related Art Generally, a filter device (filter) for liquid filtration used in this type of hydraulic equipment is provided with a housing body connected to a pipe of a liquid circuit (hydraulic circuit etc.) It is composed of a filter element that is removably housed in and held by a head cover, and the like. The filter element is an inner cylinder core having a large number of holes, and a filter medium surrounded by an outer periphery of the inner cylinder core in a state of being bent in a pleat shape (zigzag shape) in order to secure a large filtration area, In many cases, the cartridge type is composed of a bottom plate fitted to the upper and lower ends and a top plate with a flow port. When the filter element is used for a predetermined period of time, the head cover of the housing body is removed and taken out and replaced with a new one.

[0003]

By the way, in such a conventional liquid filtering filter device, since the upper part of the housing main body is opened during the replacement work of the filter element, the liquid connected to the housing main body is opened. Liquid (pressure oil, etc.) in the piping in the circuit is residual pressure or positional (height)
There is a problem that the energy overflows from the upper part of the housing body and spills around.

Therefore, conventionally, in order to prevent the liquid from flowing out from the housing body, the filter element is replaced after all the liquid in the liquid circuit is taken out,
Alternatively, the valve provided in the pipe connected to the housing body must be closed before the filter element is replaced.

However, it takes a lot of time to completely remove the liquid in the liquid circuit, and the efficiency of the replacement work of the filter element is very poor. Although it seems easy to close the valve in the middle of the piping, it is troublesome and troublesome besides that, and there is a risk of forgetting to open the valve after the replacement work and causing a serious abnormality in the liquid circuit.

The present invention has been made in view of the above circumstances, and an object thereof is to remove the head cover from the housing body during the replacement work of the filter element, so that the inlet and the outlet of the housing body are automatically closed. There is no need to worry about the liquid in the liquid circuit overflowing from the housing body due to residual pressure or positional (height) energy, and the used filter element can be taken out together with the head cover. If it is attached to, the inlet and outlet can be automatically opened and conduction with the liquid circuit can be achieved, and the liquid filtering function can be exerted as it is. No need to open and close the valve of the filter element, it is very simple and efficient. It is to provide a liquid filtration filter device capable bets exchange.

[0007]

In order to achieve the above object, the liquid filtering filter device of the present invention has a bottomed vertical cylindrical shape with a filter chamber inside and has an upper end portion. A housing main body having a valve mounting port and having an inlet port and an outlet port, which are connected to the liquid circuit on the peripheral wall portion, in the circumferential direction and spaced from each other, and the inlet port rotatably mounted in the valve mounting port of the housing body. And a cylindrical valve having a hole corresponding to the outlet port and a filter element in the lower part of the housing body, which can be inserted into and removed from the valve mounting port, and fastened and fixed at a position rotated by a predetermined angle in the inserted state. And a head cover for holding the filter element in the filtration chamber of the housing body, the head cover being inserted into a valve mounting opening of the housing body and fixed at a fixed position. By rotating the cylindrical valve by a predetermined angle, the cylindrical valve follows and rotates to the open state, and conversely when the rotating valve is returned to the insertion / removal position, the cylindrical valve follows and rotates to the closed state, and the cylinder Only when the valve is in the open state, an introduction flow path that communicates the introduction port with the filtration chamber of the housing body through the hole of the cylindrical valve, and a derivation that communicates the inside of the filter element of the filtration chamber with the derivation port And a flow path.

In the case of the liquid filtering filter device having such a structure, when the filter element in the housing body is replaced, the head cover on the upper part of the housing body is rotated from the fixed position to the insertion / removal position and pulled out upward. Along with this, the used filter element can also be taken out to the outside, and the cylindrical valve follows the rotation operation of the head cover from the fixed position to the insertion / removal position, and the inlet and connection for connecting to the liquid circuit of the housing body. The outlet is closed automatically. With this, the liquid in the liquid circuit remains in the residual pressure and position (high pressure) without any troublesome operation such as withdrawing all the liquid in the liquid circuit or closing a valve in the middle of piping of the liquid circuit. There is no need to worry about the energy overflowing from the inside of the housing.

If a head cover having a new filter element attached to the lower portion is inserted from the valve mounting port of the housing body and rotated by a predetermined angle to be fastened and fixed, the new filter element can be set and held in the filtration chamber of the housing body. At the same time, the cylindrical valve follows and automatically opens, and the introduction flow path and the discharge flow path of the head cover are connected to the introduction port and the discharge port of the housing through the holes of the cylindrical valve, respectively. Become. Now, without forgetting to open the valve, the liquid flows from one side of the external fluid circuit into the filtration chamber of the housing body through the inlet, the hole of the valve and the inlet flow path, where the filter medium flows from the outer periphery of the filter element to the inner side. While flowing, it flows out to the other of the external fluid circuits through the outlet flow path, the hole of the valve, and the outlet, so that the liquid filtering mechanism can be sufficiently exhibited.

According to a second aspect of the present invention, there is provided a filter device for liquid filtration, in which a cylindrical valve is prevented from coming off and a plurality of substantially L-shaped hook-shaped grooves are formed on an inner peripheral surface of the valve mounting port of the housing body. While providing the ring cover, the head cover is provided with a protrusion that slidably fits into the hook-shaped groove of the ring cover, and the head cover is removably inserted into the valve mounting port of the housing body from the fixed position through the ring cover. It is characterized in that it can be rotated to a fixed position by a predetermined angle.

This makes it easy to insert and remove the head cover from and into the housing body at a fixed position and to rotate the head cover at a predetermined angle from the inserted and removed position to a fixed position. The operation is reliable.

According to the third aspect of the present invention, there is provided a filter device for liquid filtration in which a gasket which is in liquid-tight contact with the cylindrical valve is mounted around the opening of the inlet and outlet of the inner surface of the valve mounting port of the housing body. Characterize. As a result, the seal between the inner surface of the valve mounting port of the housing body and the cylindrical valve becomes reliable, and the liquid leakage at the time of closing the valve can be reliably prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the liquid filtering device of the present invention will be described below with reference to the drawings. 1 is a vertical cross-sectional view in the assembled and used state, FIG. 2 is a cross-sectional view in the replacement work state in which the filter element is pulled out, and FIG. 3 is an exploded perspective view.

First, reference numeral 1 in the drawing indicates a housing body. The housing body 1 is a container having a thick bottomed vertical tubular shape excellent in rigidity and strength, which is integrally formed of a thermoplastic polymer resin material such as metal, polyester, polypropylene, polyethylene, nylon, or polycarbonate. The inside is a filtration chamber 2.

A head portion 3 having a slightly larger diameter is integrally formed at the upper end of the housing body 1, and a circular valve mounting port 4 is formed at the center of the head portion 3 so as to open upward. Further, an inlet port 5 and an outlet port 6 connected to the pipes A and B of the external liquid circuit are circumferentially spaced from each other on the peripheral wall of the head part 3, that is, face each other on the left and right sides and penetrate each other. It is formed to

Recesses 7 with vertical grooves are formed on both left and right sides inside the valve mounting port 4 of the head portion 3 of the housing body 1, and the protrusion-provided gaskets 8 are slidably fitted into the recesses 7 from above. It is attached. Each of the gaskets 8 on both sides has a hole 8a that is in communication with the inlet port 5 and the outlet port 6 at the center, and is arranged around the opening of the inlet port 5 and the outlet port 6.

A cylindrical valve 9 is rotatably slidably fitted in the valve mounting port 4 with the gasket 8. The cylindrical valve 9 has a pair of holes 9a and 9b corresponding to the inlet 5 and the outlet 6, and the cylindrical valve 9 rotates forward and backward by a predetermined angle (for example, 90 degrees) so that the hole 9 can be rotated.
a and 9b are introduced through the hole 8a of the gasket 8 into the inlet port 5
Also, the valve 9 may be in an open state in which it communicates with the outlet 6 and may be in a closed state in which the holes 9a and 9b are completely displaced from the inlet 5 and the outlet 6. In the opened state, the peripheral surface of the cylindrical valve 9 comes into liquid-tight contact with the gasket 8 to keep the sealed state. Further, a concave step portion 9c for linkage is formed on the inner peripheral edge of the upper end of the cylindrical valve 9.

A ring cover 10 is partly fitted in a recess in the upper surface of the head portion 3 of the housing body 1, and a ring cover 10 is positioned and fixed by a plurality of (for example, four) bolts 11. The ring cover 10 is a thick annular body and prevents the cylindrical valve 9 in the valve mounting port 4 from being pulled out upward. Further, the ring cover 10 has a plurality of (for example, three) hook-shaped grooves 12 each having a substantially L shape formed on the inner peripheral surface thereof at equal intervals in the circumferential direction.

A head cover 31 with a filter element 21 that is removable and replaceable is provided for such a housing assembly (housing assembly). The filter element 21 is surrounded by an inner cylindrical core 22 having a large number of holes and a plurality of pleats (zigzag) bent to secure a large filtration area. It is also a cartridge type which is composed of the filtered filter medium 23, a bottom plate 24 fitted to the upper and lower ends of the filter medium 23, and a top plate 25 with a flow port 25a.

The head cover 31 includes a top plate portion 32,
This is an integrally-molded product that is provided with the lower stepped cylindrical body portion 33 and the filter attachment port portion 34 at the lower end thereof that are continuous in the same axial line. The filter element 21 is connected to the filter mounting opening 34 at the lower end of the top plate 25 through the flow port 2.
5a is attached by fitting in a liquid-tight manner via a packing 26 such as an O-ring.

The ring cover 1 is attached to the valve mounting port 4 of the head portion 3 of the housing body 1 with the head cover 31 attached to the lower portion of the filter element 21.
It can be inserted and removed from above via 0, and can be fastened and fixed to the ring cover 10 by a plurality of (for example, three) bolts 35 at a position rotated by a predetermined angle from the inserted position. The top plate portion 32 holds the valve 1 in the filtration chamber 2 of the main body 1 and closes the valve mounting port 4.

Here, a plurality of (eg, three, for example, 3 are provided on the outer periphery of the upper-stage large-diameter portion of the stepped cylindrical portion 33 of the head cover 31.
Projections 36 are provided at equal intervals in the circumferential direction,
These protrusions 36 are formed in the hook-shaped grooves 1 of the ring cover 10.
By sliding the head cover 31 into the valve mounting opening 4 of the housing body 1, the head cover 31 can always be inserted into and removed from the fixed position and rotated from the inserted position to a fixed position by a predetermined angle (for example, 90 degrees). It is operable so that it can be prevented from coming out upward and can be fastened and fixed by the bolt 35.

Further, the head cover 31 has a small protrusion 37 on the lower side of the one protrusion 36, and the head cover 31 is fixed to the valve mounting port 4 of the head 3 via the ring cover 10 as described above. When the head cover 31 is rotated in this state, the small projection portion 37 engages with the recessed step portion 9c for linking the cylindrical valve 9 so that the cylindrical valve 9 follows and rotates together. Has become. That is, by inserting the head cover 31 into the valve mounting port 4 and rotating the head cover 31 at a fixed position by the bolt 35 by a predetermined angle, the cylindrical valve 9 rotates following the holes 9a, 9a.
When b is in a valve-opened state in which it is in communicative communication with the inlet port 5 and the outlet port 6 through the hole 8a of the gasket 8, and conversely the head cover 31 is rotated to return to the insertion / removal position (fixed position), the hole 9a , 9b are completely displaced from the inlet 5 and the outlet 6 and are in a closed state.

Further, an introduction passage 38 formed by recessing one side portion of the stepped cylindrical portion 33 of the head cover 31 in the lower step small diameter portion, and the other side portion from the filter mounting port 34 through the central portion. An outlet channel 39 is formed to open at. The introduction flow passage 38 and the discharge flow passage 39 are inserted into the valve mounting port 4 of the head cover 31 so that the cylindrical valve 9
Connected to the holes 9a and 9b of the head cover 3 in this state.
Only when the cylindrical valve 9 is rotated to the open position by a predetermined angle together with 1, the introduction passage 38 communicates the introduction port 5 with the filtration chamber 2 of the housing body 1 (outer peripheral space of the filter element 21). The outlet flow path 39 connects the inside of the filter element 21 of the filtration chamber 2 and the outlet 6.

The top plate portion 32 of the head cover 31 is
A handle 40 for rotation operation bent in an L shape is integrally provided on the upper surface of the. Further, a packing 41 such as an O-ring is provided on the outer circumference of the upper large diameter portion of the stepped cylindrical body portion 33 of the head cover 31, and this packing 41 is liquid-tightly joined to the inner peripheral surface of the upper end of the cylindrical valve 10. It is designed to prevent upward leakage.

In the liquid filtering filter device having such a construction, the head cover 31 having the filter element 21 mounted on the lower portion is inserted into the valve mounting port 4 of the head portion 3 of the housing body 1 from the fixed position via the ring cover 10 to set a predetermined angle. When the filter element 21 is rotated and fastened and fixed, the filter element 21 is set and held in the filtration chamber 2 of the housing body 1, and the cylindrical valve 9 is rotated following the automatic opening of the cylindrical valve 9. The introduction flow path 38 and the discharge flow path 3 of the head cover 31 through the holes 9a and 9b, respectively.
9 connects to the inlet 5 and the outlet 6 of the housing body 1.

With this, the liquid such as pressure oil introduced from one pipe A of the external fluid circuit passes through the inlet port 5, the hole 9a of the valve 9 and the inlet passage 38, and the filtration chamber 2 of the housing body 1. Flows into the outer peripheral space of the filter element 21 inside,
From there, impurities such as sludge and dust in the liquid are filtered and collected by the filter medium 23 of the filter element 21, and the cleaned liquid flows into the inside of the filter medium 23, and the filter is discharged from the flow port 25a of the upper top plate 25 thereof. It will flow out to the other pipe B of the external fluid circuit via the attachment port 34, the outlet flow path 39, the hole 9b of the valve 9, and the outlet 6. This will filter the liquid in the fluid circuit.

Here, when the filter element 21 is to be replaced after being used for a certain period of time, the bolt 35 of the head cover 31 is removed, and the handle 40 is held and the head cover 31 is rotated from the fixed position by a predetermined angle contrary to the previous time. Operate it to move it to the insertion / removal position, pull it upward from there and pull it out. With this, the used filter element 21 can be taken out together with the head cover 31.

Moreover, the cylindrical valve 9 follows and rotates by the rotation operation of the head cover 31 from the fixed position to the insertion / removal position, and the holes 9a and 9b are completely removed from the inlet 5 and the outlet 6 of the housing body 1. It shifts. That is, the cylindrical valve 9 is automatically closed in conjunction with the head cover 31. With this, the liquid in the liquid circuit remains in the residual pressure or position (high) without any troublesome operation such as withdrawing all the liquid in the liquid circuit or closing the valve in the middle of the piping of the liquid circuit. There is no need to worry about the energy overflowing from the inside of the housing body 1.

Then, the head cover 31 having the new filter element 21 mounted on the lower portion is inserted into the valve mounting port 4 of the housing body 1 from the fixed position via the ring cover 10 and is rotated by a predetermined angle to be fastened and fixed. The filter element 21 is installed in the filtration chamber 2 of the housing body 1.
At the same time, the cylindrical valve 9 can follow and rotate to automatically open and return to the original use state. With this, the liquid in the external fluid circuit can be introduced into the filtration chamber 2 of the housing body 1 and filtered by the filter element 21 without forgetting to open the valve.

A plurality of hook-shaped grooves 1 of the ring cover 10 mounted on the valve mounting port 4 of the housing body 1 are also provided.
Since the protrusion 36 of the head cover 31 is slidably fitted into the valve cover 2, the head cover 31 can be inserted into and removed from the valve mounting opening 4 of the housing body 1 at a fixed position, and can be moved to a fixed position from the inserted and removed position. The rotation operation of the predetermined angle can be performed easily, and the valve opening / closing operation by the follow-up rotation of the cylindrical valve 10 can be ensured.

Further, the valve mounting port 4 of the housing body 1
By mounting the gasket 8 that is in liquid-tight contact with the cylindrical valve 9 around the openings of the inlet port 5 and the outlet port 6 on the inner surface, the seal between the inner surface of the valve mounting port 4 and the cylindrical valve 9 becomes reliable. Thus, it becomes possible to more surely prevent the liquid from leaking when the valve is closed.

The ring cover 10 does not necessarily have to be provided. For example, the retaining step of the cylindrical valve 9 and the hook-shaped groove 12 for guiding and engaging the projection 36 of the head cover 31 are provided in the head of the housing body 1. It may be formed directly on the upper edge of the valve mounting port 4 of the portion 3. In addition, various modifications can be made without departing from the scope of the present invention.

[0034]

Since the filter device for liquid filtration of the present invention is constructed as described above, when the head cover is removed from the housing body when the filter element is replaced, the inlet and outlet ports of the housing body are formed by the cylindrical valves. A new filter element that automatically closes and can remove the used filter element together with the head cover without worrying that the liquid in the liquid circuit will overflow from the housing body due to residual pressure or positional (height) energy If the head cover is attached to the housing body together with the head cover, the inlet and outlet can be automatically opened to establish electrical connection with the liquid circuit, and the liquid filtering function can be exerted as it is. There is no need to bother with pulling out and opening and closing valves in the middle of piping, making it extremely easy and efficient. You can replace the filter element.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a filter device for liquid filtration of the present invention in an assembled and used state.

FIG. 2 is a cross-sectional view showing a state in which a filter element according to the above-mentioned embodiment is pulled out and replaced.

FIG. 3 is an exploded perspective view of the above embodiment.

[Explanation of symbols]

1 ... Housing body, 2 ... Filtration chamber, 4 ... Valve mounting port,
5 ... Inlet port, 6 ... Outlet port, 8 ... Gasket, 9a, 9b
... Hole, 9 ... Cylindrical valve, 10 ... Ring cover, 12 ... Hook-shaped groove, 21 ... Filter element, 31 ... Head cover, 36 ... Projection, 38 ... Introducing channel, 39 ... Outflowing channel.

Claims (3)

[Claims] 1. A vertical cylinder having a bottom with a filter chamber inside, a valve mounting port at the upper end, and an inlet and outlet that are connected to a liquid circuit in the peripheral wall and are separated from each other in the circumferential direction. And a cylindrical valve having a hole rotatably mounted in a valve mounting opening of the housing main body and having holes corresponding to the inlet and the outlet, and a housing element having a filter element in a lower portion. A head cover that is insertable / removable from the valve mounting port and that is fastened and fixed at a position where it is rotated by a predetermined angle in the inserted state to hold the filter element in the filtration chamber of the housing body, and the head cover is a valve of the housing body. Inserted into the mounting port and rotated to a fixed position by a predetermined angle to rotate the cylindrical valve following and to open the valve,
On the contrary, when the cylindrical valve is rotated to return to the insertion / removal position, the cylindrical valve is rotated to follow the closed state, and only when the cylindrical valve is opened, the introduction port and the housing are inserted through the holes of the cylindrical valve. An introduction flow path that communicates with the filtration chamber of the main body,
A filter device for liquid filtration, characterized in that it has a lead-out flow path that connects the inside of the filter element of the filtration chamber and the lead-out port. 2. The filter device for liquid filtration according to claim 1, wherein a cylindrical valve is retained on a valve mounting port of a housing body, and a plurality of substantially L-shaped hook-shaped grooves are provided on an inner peripheral surface portion. While providing the ring cover, the head cover is provided with a protrusion that slides into the hook-shaped groove of the ring cover, and the head cover is removably inserted from the fixed position into the valve mounting port of the housing body through the ring cover. A filter device for liquid filtration, characterized in that it can be rotated to a fixed position by a predetermined angle. 3. The filter device for liquid filtration according to claim 1 or 2, wherein a gasket that is in liquid-tight contact with the cylindrical valve is mounted around the opening of the inlet and outlet of the valve mounting port of the housing body. A filter device for liquid filtration, comprising: