JP2001259314A - Drain filter of hydraulic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rain filter of a hydraulic apparatus which does not need to maintain the shape of a filter, can be carried easily, and is replaced easily. SOLUTION: The drain filter is composed of a cylindrical housing body 21 having a discharge opening 21b for discharging oil, a lid body 22 which is fitted to the upper end of the housing body 21 and has an inflow port, and filter bodies 23, 24 housed in the housing body 21 while being laid to overlap each other, and the filter bodies 23, 24 have cylindrical, flexible mesh parts 23a, 24a, flange parts 23b, 24b fitted to the mesh parts 23a, 24a, bypath parts 23c, 24c through which oil is passed when the mesh parts 23a, 24a are clogged, and shape keeping parts 23d, 24d fitted to the lower ends of the mesh parts 23a, 24a, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain filter for a hydraulic device such as a hydraulic elevator, and more particularly to a hydraulic device for preventing foreign matter mixed into an oil return pipe from an elevator shaft from entering an oil tank. Related to a drain filter.

[0002]

2. Description of the Related Art In general, in a hydraulic elevator, a suction filter is provided in an oil tank. If the suction filter is clogged, cavitation occurs in the hydraulic pump and vibration and noise are generated. Even in the car or in front of the machine room, it gives discomfort if it reaches the level that people can feel, and if the suction filter clogs beyond a certain level, the elevator car does not arrive at the destination floor while traveling, and The car stops and stops the person in the car, causing an accident. Inspection and cleaning of the suction filter in the oil tank, which is performed to prevent such an accident of the elevator, requires much time and labor.

[0003] Conventionally, in order to reduce the inspection and cleaning work of the suction filter, for example, Japanese Patent Application Laid-Open No.
As described in Japanese Patent Publication No. 0106, there is proposed an oil tank in which a hydraulic oil is stored, and a drain filter for filtering hydraulic oil flowing from an oil return pipe is provided.
In this conventional technique, the drain filter of the oil tank is cleaned,
The inspection prevents the suction filter provided in the oil tank from being clogged, thereby preventing dust from flowing into the hydraulic pump.

[0004]

In the prior art described above, in order to prevent dust from flowing into the oil tank, a drain filter for filtering the oil flowing from the oil return pipe is installed in the oil tank. However, when it is difficult to reliably clean the drain filter, the new drain filter is transported to the location of the hydraulic device and replaced with the existing drain filter. However, since the drain filter is inflexible such as metal, it is difficult to maintain the shape of the new drain filter when transporting to the location of the hydraulic device while maintaining the shape of the new drain filter. There was a problem.

The present invention has been made in view of such a situation in the prior art, and has as its object to provide a hydraulic device which can be easily transported without having to maintain a filter shape and which can easily perform filter replacement. To provide a drain filter.

[0006]

In order to achieve the above object, the present invention provides a hydraulic jack having a plunger which moves up and down by supplying and discharging hydraulic oil, a hydraulic pump for supplying hydraulic oil to the hydraulic jack, An oil tank for storing oil, a pipe connecting the oil tank and the oil tank, a suction filter provided in a pipe connecting the oil tank and the hydraulic pump, and an oil leaking from a gland when the plunger moves up and down. A drainage filter for a hydraulic device provided in a hydraulic device having an oil return pipe for returning the oil into the oil tank and removing foreign matter mixed in return oil passing through the oil return pipe, comprising a flexible net. A cylindrical mesh portion, a shape maintaining portion detachably attached to a lower end of the mesh portion and maintaining the shape of the mesh portion, and a detachable upper end of the mesh portion; A filter body having a flange portion mounted in the radial direction and a bypass portion that allows oil to pass when the mesh portion is clogged, and an upper end surface including an opening portion, having a discharge port for discharging oil, A storage body for storing the filter body, a lid attached to an upper end of the storage body and having an inflow port through which the oil flowing from the oil return pipe flows, and a fixture for fixing the lid to the storage body It consisted of:

In the present invention constructed as described above, the filter can be easily replaced by removing the filter from the housing and removing the mesh portion of the filter from the collar and the shape maintaining portion. Further, since the mesh portion has flexibility, the mesh portion can be stored compactly and can be easily transported without maintaining the filter shape.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drain filter for a hydraulic device according to the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a drain filter of a hydraulic device according to one embodiment of the present invention, FIG. 2 is a perspective view illustrating an assembling operation of a filter body provided in this embodiment, and FIG.
Is a perspective view showing a state where the filter body provided in the present embodiment is assembled, FIG. 4 is a front view showing a state where the present embodiment is mounted on a jack rail, and FIG. 5 is a state showing a state where the present embodiment is mounted on a jack rail. FIG. 6 is a front view showing a state in which the present embodiment is attached to a cylinder of a hydraulic jack,
FIG. 7 is an explanatory diagram of a hydraulic elevator including the present embodiment.

The hydraulic elevator shown in FIG.
The hydraulic oil 2 in the oil tank 1 installed in the plunger 1 is supplied to the hydraulic jack 11 by the hydraulic pump 3.
2 is raised, and a car 15 is pulled by a wire rope 14 through a pulley 13 installed above the plunger 12.
To rise. One end of the wire rope 14 is the jack base 1
6, and the other end is connected to the car 15;
The speed of the car 15 is controlled by controlling the flow rate of the hydraulic oil by the control valve 4. The hydraulic oil in the hydraulic jack 11 is supplied to the oil tank 1 through the pipe 5.
The plunger 12 is lowered by returning it inside, and the car 15 is also lowered at the same time.

In such a hydraulic elevator, a suction filter 6 is provided at a suction end of a pipe 5a inside the oil tank 1. When foreign matter such as dust enters the oil tank 1 for some reason, the suction filter 6 is used. 6
Therefore, foreign matter 7 is prevented from entering the hydraulic pump 3, the control valve 4 and the hydraulic jack 11. For example, when the car 15 rises, when the hydraulic pump 3 rotates, the hydraulic oil 2 in the oil tank 1 passes through the suction filter 6 and is fed into the hydraulic jack 11 so that the plunger 12 rises, and the plunger 12 and the wire rope The car 15 connected at 14 rises. At this time, the hydraulic oil 2 has adhered to the surface of the plunger 12,
The attached hydraulic oil 2 flows down, accumulates in a groove (not shown) of the gland 17, and is led to the oil return pipe 18. At this time, worn pieces of packing (not shown) in the ground portion 17 and fibrous dust 19a diffused in the hoistway 19 adhere to the hydraulic oil on the surface of the plunger 12, and the hydraulic oil 2 accumulated in the groove portion Foreign matter such as a worn piece of packing or dust 19a is mixed.

The drain filter 20 of the present embodiment
Is installed near the ground portion 17 of the hydraulic jack 11, and an oil return pipe 18 connected to the ground portion 17 is provided.
It is interposed on the way. As shown in FIGS. 4 and 5, for example, the bracket 30 is attached to the jack rail 11a.
a, 30b, these brackets 30a, 3b
The drain filter 20 is fixed to 0b with a U bolt 30c or the like.

The drain filter 20 of the present embodiment
As shown in FIG. 1, a cylindrical storage body 21 having an opening at the upper end surface, a lid 22 attached to the upper end of the storage body 21, and a storage It is mainly composed of the stored filter bodies 23 and 24.

A plurality of fixtures 21a for fixing the lid 22 are provided on the upper part of the housing 21, and an outlet for discharging oil is connected to the oil return pipe 18 on the downstream side at the lower part of the housing 21. 21b is provided. The lid 22 is provided with an inflow port 22a into which the oil flowing from the oil return pipe 18 flows.

The small-diameter filter body 23 located inside is
Cylindrical mesh portion 23a made of a flexible net
And a flange portion 23b which is detachably attached to the upper end of the mesh portion 23a and expands in the radial direction.
, A bypass portion 23c that allows oil to pass through when the mesh portion 23a is clogged, a shape maintaining portion 23d that is detachably attached to a lower end of the mesh portion 23a, and that maintains a shape of the mesh portion 23a, and a brim portion 23b. Mesh part 23
and a holder 23e for holding a state of being attached to a.

Similarly, the large-diameter filter body 24 located on the outside also has a cylindrical mesh portion 24a made of a flexible net, and is detachably mounted on the upper end of the mesh portion 24a, and has a radial direction. And a bypass portion 24c provided in the brim portion 24b and allowing oil to pass through when the mesh portion 24a is clogged. The bypass portion 24c is detachably attached to a lower end of the mesh portion 24a to maintain the shape of the mesh portion 24a. 24d, and a holder 24e for holding the collar 24b mounted on the shape maintaining portion 24d.
It is composed of The areas of the mesh portions 23a and 24a are set in view of a maintenance cycle that allows an operator to inspect the filter bodies 23 and 24 before all of the mesh portions 23a and 24a are clogged.

In the drain filter 20 of this embodiment, the hydraulic oil 2 guided to the oil return pipe 18 is used to cover the lid 2 of the drain filter 20 installed near the gland 17.
2 through the inflow port 22a, and the inner filter body 23
When reaching the bottom of the mesh portion 23a, foreign matter such as abrasion debris of packing and dust 19a contained in the hydraulic oil 2 is filtered by the mesh portion 23a, so that only the hydraulic oil 2 passes through the mesh portion 23a. Next, the outer filter body 2
After being filtered by the mesh portion 24a of FIG. 4, the hydraulic oil 2 flows out from the outlet 21b and reaches the oil tank 1 via the oil return pipe 18 on the downstream side. As a result, foreign substances such as abrasion debris of packing and dust 19a mixed in the oil tank 1 are filtered by the mesh portions 23a and 24a, and are not mixed in the oil tank 1. Therefore, the suction filter 6 is a difficult operation.
Can reduce the number of cleaning operations.

When the above-described filtering operation is repeated, foreign substances such as worn pieces of packing and dust 19a gradually adhere to the inner walls of the mesh portions 23a and 24a.
Therefore, when inspecting the drain filter 20, the operator rides on the upper part of the car 15, moves the car 15 to a position where the drain filter 20 can be inspected, and stops the car. Then, in this state, the fixture 2 of the drain filter 20 is
After removing the lid 1a and removing the lid 22 from the housing 21, the filters 23 and 24 are taken out from the housing 21 and the clogged state of the mesh portions 23a and 24a is visually inspected. At this time, in a state where dust and the like inside the mesh portions 23a and 24a are accumulated, the state becomes a cup-like state, that is, a state where the hydraulic oil 2 is accumulated. Sucking out with something like a non-absorbing body, or flowing one hydraulic oil 2 of the filter bodies 23 and 24 into the other mesh part,
The hydraulic oil 2 may be returned to the oil tank 1.

In consideration of the operating frequency of the hydraulic elevator, the condition of the hoistway 19, and the site environment, the clogging amount of the mesh portions 23a and 24a until the next inspection cycle is taken into consideration. Worn pieces and dust of packing 1
It is examined whether a foreign matter such as 9a flows in an amount exceeding the area of the mesh portions 23a and 24a. At this time, foreign matter such as a worn piece of packing and dust 19a
When it is not considered that an amount exceeding the area of a, 24a flows in, cleaning is not performed, so that the inspection time can be efficiently used without spending the inspection time unnecessarily.

As a result of the above examination, when it is determined that the amount of the foreign matter is excessive, in order to replace both or one of the mesh portions 23a and 24a with a new one, for example, as shown in FIG.
After removing the holder 23e from the inner filter body 23 shown in FIG. 2 and removing the mesh part 23a from the collar part 23b, and also removing the mesh part 23a from the shape maintaining part 23d, as shown in FIG. A shape maintaining portion 23d is attached to the lower end of the mesh portion 23a, and a collar portion 23b is attached to the upper end of the mesh portion 23a. The holder 23e holds the collar portion 23b attached to the mesh portion 23a. Further, the mesh part 24a of the outer filter body 24 is replaced with a new one by the same procedure. Next, after the new filter bodies 23 and 24 are double overlapped and stored in the storage body 21 and the lid 22 is attached, the lid 22 is fixed to the storage body 21 by the fixture 21a.

If the mesh portions 23a and 24a are clogged, the hydraulic oil 2 passes through the bypass portions 23c and 24c and is stored at the bottom of the housing 21, and the discharge ports 21b and
Since the oil is passed through the oil return pipe 18 and guided into the oil tank 1, the drain filter 20 itself does not become clogged, and there is no failure that the hydraulic oil 2 overflows from the gland portion 17.

In the drain filter 20 of this embodiment configured as described above, the clogged state of the mesh portions 23a and 24a is a simple check only by visual observation, and only the mesh portions 23a and 24a are replaced with new ones. Therefore, there is no need to clean the mesh portions 23a and 24a. As a result, the cleaning operation can be eliminated and the operation time can be shortened as compared with the conventional case in which the drain filter needs to be cleaned and the operation accuracy and time are not uniform among the operators.

Further, in the drain filter 20 of the present embodiment, the mesh portions 23a and 24a are flexible, so that they can be stored compactly and can be easily conveyed without maintaining the shape. Also, the mesh portions 23a, 24a
Exchange is easy.

Further, in the drain filter 20 of the present embodiment, foreign matters such as dust can be captured in the vicinity of the ground portion 17 by being provided in the vicinity of the ground portion 17. Even in an installation state in which dust easily accumulates (an installation state that draws a U-shape), foreign matter such as dust does not accumulate in the oil return pipe 18. Therefore, the oil return pipe 18 is clogged with foreign matter and the hydraulic oil 2 overflows from the gland 17, for example, a cavitation occurs in the hydraulic pump 3, generating vibrations and noises. It is also possible to prevent the car 15 from being discomforted and the car 15 of the hydraulic elevator not reaching the destination floor during traveling, stopping halfway, and trapping people in the car.

In this embodiment, as shown in FIGS. 4 and 5, the drain filter 20 is connected to the jack rail 11a.
Is illustrated, but as shown in FIG. 6, a hose band 30d is attached to the cylinder 11b of the hydraulic jack 11.
It can also be fixed with a coupling fitting 30e or the like, and is fixed by a method suitable for the environment of the hoistway of each hydraulic elevator.

[0026]

As described above, according to the present invention, the filter can be easily replaced by removing the filter body from the housing and removing the mesh portion from the collar portion and the shape maintaining portion. Further, since the mesh portion has flexibility, it can be stored compactly and can be easily transported without maintaining the filter shape.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a drain filter of a hydraulic device according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating an operation of assembling a filter body provided in the embodiment.

FIG. 3 is a perspective view showing a state where a filter body provided in the embodiment is assembled.

FIG. 4 is a front view showing a state where the present embodiment is mounted on a jack rail.

FIG. 5 is a side view showing a state where the present embodiment is mounted on a jack rail.

FIG. 6 is a front view showing a state where the present embodiment is mounted on a cylinder of a hydraulic jack.

FIG. 7 is an explanatory diagram of a hydraulic elevator including the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil tank 2 Hydraulic oil 3 Hydraulic pump 5 Piping 6 Suction filter 11 Hydraulic jack 12 Plunger 18 Oil return piping 20 Drain filter 21 Housing 21a Fixing tool 21b Drain 22 Lid 22a Inflow 23, 24 Filter bodies 23a, 24a Mesh Part 23b, 24b Collar part 23c, 24c Bypass part 23d, 24d Shape maintaining part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 29/10 510C 510F 530B (72) Inventor Sumio Nagashima 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Stock (72) Inventor Shinichi Higashide 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo Inside the Hitachi Building Systems Co., Ltd. (72) Makoto Kunii 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo F term in Hitachi Building Systems, Ltd. (reference) 3F301 BA01 BB03 BB14 CA11 3H082 AA12 AA21 CC02 DA09 DB12 DB38 EE10 4D064 AA23 BM22

Claims (1)

[Claims] 1. A hydraulic jack having a plunger which moves up and down by supply and discharge of hydraulic oil, a hydraulic pump for supplying hydraulic oil to the hydraulic jack, an oil tank for storing hydraulic oil, and a pipe connecting these to each other A hydraulic device comprising: a suction filter provided in a pipe connecting the oil tank and a hydraulic pump; and an oil return pipe returning oil leaking from a gland portion into the oil tank when the plunger moves up and down. A drain filter of a hydraulic device for removing foreign matter mixed in return oil passing through the oil return pipe, wherein a cylindrical mesh portion made of a flexible mesh body is detachably attached to a lower end of the mesh portion. A shape maintaining portion that is attached to maintain the shape of the mesh portion, a flange portion that is detachably attached to an upper end of the mesh portion and that expands in the radial direction, and the mesh portion; A filter body having a bypass section to pass oil upon clogging of the Interview section, the upper end surface is from the opening, has a discharge port for discharging oil,
A housing that houses the filter body, a lid that is attached to an upper end of the housing, and that has an inflow port through which oil flowing from the oil return pipe flows, and a fixing that fixes the lid to the housing And a drain filter for hydraulic equipment, comprising: