JPH08252412A - Filter device - Google Patents

Abstract

PURPOSE: To dispense with the installation of piping in a tank and facilitate the performance of maintenance services and also the cleaning and replacement of a filter by inserting a flange member into the screw hole or peripheral hole of a socket member, and installing a filter member protruding from the socket member by introducing the filter member through an insertion hole. CONSTITUTION: If a pump is activated, a hydraulic oil HD in an oil tank, 3 flows out of an opening part 32 passing through a filter member 31, and flows into the suction aperture of the pump passing through a piping member 51 and a pipe material 53. The hydraulic oil HD in the oil tank 3 flows also into a peripheral hole 22, passing through a clearance between an insertion hole 23 and the filter member 31, and consequently, reaches the opening 32 passing through the filter member 31. This passage through the filter member 31 results in the removal of dust, cutting particles and other foreign matter contained in the hydraulic oil HD. Further, the oil tank 3 is connected to the pump, so that the piping member 51 has only to be screwed into a tapered screw hole 21 of the filter device 5. Thus, the maintenance services are simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device provided for filtering and extracting oil from an oil tank of a hydraulic unit, for example.

[0002]

2. Description of the Related Art FIG. 3 is a front view showing a conventional hydraulic unit 80. In FIG. 3, the hydraulic unit 80
Is a substantially rectangular parallelepiped box-shaped oil tank 81, a motor 82 mounted and mounted on the upper plate of the oil tank 81, a pump 83 rotatably driven by the motor 82, a filter device 84, and a flow path. And a valve device 85 for

The filter device 84 is connected to the suction port of the pump 83 by a pipe 86, and is attached so as to be arranged at a position near the bottom in the oil tank 81. The filter device 84 collects dust mixed in the pressure oil HD when the pressure oil HD in the oil tank 81 is sucked by the pump 83,
It acts to remove chips and other foreign matter. The return oil discharged from the valve device 85 passes through the pipe 87 and enters the oil tank 81.

FIG. 4 is a front view showing another conventional hydraulic unit 90. 4, a hydraulic unit 90 includes a base plate 91 having a rectangular plan view, an oil tank 92 mounted and mounted on the base plate 91, and a motor 9
3, a pump 94 rotatably driven by a motor 93, a filter device 95, a valve device 96 for switching a flow path, and the like.

The filter device 95 is connected by a pipe 97 that extends from the suction port of the pump 94 through the upper plate of the oil tank 92 to the inside of the oil tank 92, and is arranged at a position near the bottom in the oil tank 92. Is installed as.

[0006]

In the hydraulic unit 80 shown in FIG. 3, it is necessary to provide a pipe 86 immersed in the pressure oil HD in order to connect the pump 83 and the filter device 84. Such piping 86 is troublesome in piping work, and at the time of maintenance of the hydraulic unit 80, it is necessary to remove or install the filter device 84 in order to inspect the inside of the oil tank 81. It is troublesome. Furthermore, since it is not easy to attach and detach the filter body of the filter device 84, the filter cannot be easily washed or replaced. Further, the hydraulic unit 80 of this type has a drawback that the entire installation space becomes large because the bottom area of the oil tank 81 is relatively large.

In the hydraulic unit 90 shown in FIG. 4, since the height dimension of the oil tank 92 can be made sufficiently large, the bottom area thereof can be made small and space saving can be achieved. However, in order to connect the pump 94 and the filter device 95, it is still necessary to provide the pipe 97 dipped in the pressure oil HD. Also in the case of the hydraulic unit 90, similarly to the case of the hydraulic unit 80 of FIG. 3, there is a problem that piping work is troublesome, maintenance is not easy, and cleaning and replacement of the filter cannot be easily performed.

The present invention has been made in view of the above problems, and provides a filter device which does not require piping in a tank, can be easily maintained, and can be easily cleaned and replaced. The purpose is to

[0009]

According to a first aspect of the present invention, there is provided a filter device which is attached to a wall surface of a tank for storing a liquid and is used when the liquid is taken out from the inside of the tank to the outside. , A screw hole provided on the outer end side for connecting the piping member, a cylindrical peripheral hole continuous to the screw hole, and a peripheral hole continuous to the peripheral hole on the inner end side than the peripheral hole An insertion hole having a small diameter is formed, and the socket member is provided on the wall surface, the filter member, and a flange member provided so as to surround a flow passage of the filter member, the flange member being the socket member. In the screw hole or in the peripheral hole, and the filter member is provided through the insertion hole to project from the socket member, and in the screw hole or in the peripheral hole Vignetting, comprising a, a compression spring for urging the flange member of the filter body in the axial direction.

In the device according to the second aspect of the present invention, the screw hole is a taper screw hole.

[0011]

The liquid in the tank flows out of the opening through the filter member and then into the suction port of the pump through the piping member. The liquid in the tank 3 also flows into the peripheral hole through the gap between the insertion hole and the filter member, and from there also reaches the opening through the filter member. Dust, swarf, and other foreign matter in the liquid are removed by passing through the filter member.

Since the flange member is pressed against the pipe member by the compression spring and sealing is performed there, even when using a taper screw whose position of the tip end surface of the pipe member cannot be predetermined in the design stage, it is easy and reliable. Sealing is done. By removing the tubing, the filter body is easily removed and installed.

[0013]

1 is a partially sectional front view showing an embodiment of a filter device 5 according to the present invention, and FIG. 2 is an enlarged sectional front view showing the filter device 5.

In FIG. 1, the filter device 5 is attached to the wall surface 3a of the oil tank 3 of the hydraulic unit YY. The filter device 5 includes a socket member 11, a filter body 12, a compression spring 13, a packing 14, and the like.

The socket member 11 is formed of a metal material such as steel into a substantially cylindrical shape. The socket member 11 has a taper screw hole 21 provided on the outer end side for connecting the piping member 51, a cylindrical peripheral hole 22 continuous with the taper screw hole 21, and an inner end side continuous with the peripheral hole 22. An insertion hole 23 having a diameter smaller than that of the peripheral hole 22 is formed in the. The socket member 11 is fixed to the wall surface 3a by welding while being inserted in the hole 41 provided in the wall surface 3a.

The filter body 12 comprises a mesh-shaped filter member 31 made of stainless steel or the like, and a flange member 33 formed by press-molding a stainless steel plate so as to surround the opening 32 which is the flow passage of the filter member 31. The filter body 12 is provided such that the filter member 31 is inserted into the tapered screw hole 21 or the peripheral hole 22 of the socket member 11, and the filter member 31 is inserted into the insertion hole 23 and protrudes from the socket member 11. .

The compression spring 13 is provided between the flange member 33 and the inner flange portion 24 of the socket member 11 over the taper screw hole 21 and the peripheral hole 22 of the socket member 11. The compression spring 13 axially urges the flange member 33 of the filter body 12 toward the piping member 51.

The packing 14 is mounted between the tip end surface of the piping member 51 and the flange member 33 of the filter body 12, and seals between them. The pipe member 51 is provided with a taper screw 52 which is screwed into the taper screw hole 21 on the outer peripheral surface on the tip end side thereof. Connecting. By screwing in the piping member 51, the tip end surface thereof presses the flange member 33 in the axial direction against the elasticity of the compression spring 13. Taper screw hole 2
Since it is 1, the piping member 51 cannot be screwed in more than a certain fixed position, and therefore, it stops at a certain fixed position even though no special stopper member is provided. Therefore, a space is always formed between the tip end surface of the piping member 51 and the inner flange portion 24, and the compression spring 13 and the flange member 33 are mounted in this space, and an unreasonable force is not applied to them. . The pipe material 53 is connected to a suction port of a pump (not shown) by piping.

Next, the operation of the filter device 5 will be described. When a pump (not shown) operates, the pressure oil HD in the oil tank 3
Flows out of the opening 32 through the filter member 31,
It flows through the piping member 51 and the pipe material 53 into the suction port of the pump. The pressure oil HD in the oil tank 3 also flows into the circumferential hole 22 through the gap between the insertion hole 23 and the filter member 31, so that the pressure oil HD also passes through the filter member 31 and reaches the opening 32. By passing through the filter member 31, dust, cutting chips, and other foreign matter in the pressure oil HD are removed.

As described above, in order to connect the oil tank 3 and the pump, it suffices to screw the pipe member 51 into the tapered screw hole 21 of the filter device 5, and it is not necessary to perform the piping work in the oil tank 3. Therefore, the work is extremely easy. Further, in the maintenance of the oil tank 3, the pressure oil H
Since the filter member 31 can be easily removed when replacing D, the filter member 31 can be easily washed or replaced. Since the axial length dimension of the flange member 33 is small, the axial length dimension of the filter main body 12 can be reduced to reduce the size. Further, since the pressure oil HD flows into the peripheral hole 22 through the gap between the insertion hole 23 and the filter member 31, the pressure oil HD passes through the entire peripheral surface of the filter member 31, so that the filtering surface of the filter member 31 is effective. It is used for and does not easily clog. Since the flange member 33 is pressed against the piping member 51 by the compression spring 13 and the sealing is performed there, even when using a taper screw whose position of the tip end surface of the piping member 51 cannot be predetermined in the design stage, it is easy and reliable. Can be sealed.

In the above embodiment, the taper screw hole 21
Instead of this, parallel screw holes may be used. Flange member 33
It is also possible to omit the packing 14 when is made of a soft material. Although the socket member 11 is welded to the wall surface 3a, it may be screwed in through an appropriate packing. The filter body 12 may have various structures. In addition, the structure, shape, material, etc. of each part or the whole of the filter device 5 can be variously changed according to the gist of the present invention.

The filter device of the present invention is more convenient when applied to a hydraulic unit of the type shown in FIG. Instead of the oil tank 3, it can be applied to various tanks made of synthetic resin or the like.

[0023]

According to the inventions of claims 1 and 2,
It is possible to provide a filter device that does not require piping in the tank, is easy to maintain, and can easily wash and replace the filter.

Further, according to the second aspect of the present invention, since the piping member cannot be screwed in more than a certain amount, an appropriate space is formed inside the socket member, and the compression spring and the flange member are mounted in this space. Therefore, it will not be applied unreasonably.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a filter device according to the present invention.

FIG. 2 is an enlarged cross-sectional front view showing the filter device.

FIG. 3 is a front view showing a conventional hydraulic unit.

FIG. 4 is a front view showing another conventional hydraulic unit.

[Explanation of symbols]

 3 Oil tank 3a Wall surface 5 Filter device 11 Socket member 12 Filter body 13 Compression spring 21 Tapered screw hole (screw hole) 22 Circumferential hole 23 Insertion hole 31 Filter member 33 Flange member 51 Piping member

Claims (2)

[Claims] 1. A filter device which is attached to a wall surface of a tank for storing a liquid and is used when the liquid is taken out from the inside of the tank to the outside, the filter device being provided on an outer end side for connecting a piping member. A screw hole, a cylindrical peripheral hole continuous to the screw hole, and an insertion hole which is continuous with the peripheral hole and is provided on the inner end side and has a diameter smaller than that of the peripheral hole. A socket member provided, a filter member, and a flange member surrounding a flow passage of the filter member, wherein the flange member is inserted into the screw hole or the peripheral hole of the socket member and the filter A filter body provided with a member inserted through the insertion hole and protruding from the socket member, and provided in the screw hole or the peripheral hole, and the flange portion of the filter body. Filter apparatus characterized by comprising comprises a compression spring for biasing in the axial direction, and a. 2. The screw hole is a taper screw hole.
The described filter device.