JP2000161301A - Hydraulic device - Google Patents

Abstract

(57) [Problem] To provide a hydraulic device capable of reducing the frequency of cleaning a suction filter and preventing accidents such as overflow of hydraulic oil due to clogging of a drain filter and damage to devices such as control valves due to iron powder. SOLUTION: A mesh part 26 of a drain filter 11,
26a is set to be equal to or less than the mesh roughness of the mesh portion of the suction filter, and the drain filter 1
In each of the upper portions of the mesh portions 26 and 26a, the through holes 28 and 2
8a, a magnetic material is provided in the drain filter 11, and the hydraulic oil 2 is filtered by the relatively fine mesh portions 26, 26a. Therefore, it is possible to prevent foreign matter in the hydraulic oil 2 in the tank 1 from being filtered by the suction filter, and iron powder does not flow into the control valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic device provided in a hydraulic elevator or the like, and more particularly to a suction filter for filtering foreign matter in hydraulic oil supplied from a tank and a foreign matter in hydraulic oil returned from a hydraulic jack. The present invention relates to a hydraulic device including a drain filter for filtering.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view showing a general hydraulic elevator.

[0003] In general, a hydraulic device provided in a hydraulic elevator, as shown in FIG. 3, sucks a tank 1 and a hydraulic oil 2 in the tank 1 through a suction pipe 3 and a valve 4 and a pipe 5. A pump 6 for sending out, and a hydraulic jack 7 connected to the pipe 5 and operated in response to the inflow and outflow of the hydraulic oil 2
And a return pipe 8 for returning the hydraulic oil 2 leaked from the hydraulic jack 7 to the tank 1.

A suction filter 10 for filtering foreign substances 9 in the hydraulic oil 2 sucked from the tank 1 is provided at the inlet side of the suction pipe 3, and when the foreign substances 9 enter the tank 1 for some reason. Since the foreign matter 9 is filtered by the suction filter 10, the foreign matter 9 can be prevented from entering the pump 6, the valve 4, and the hydraulic jack 7. On the outlet side of the return pipe 8, a drain filter 11 for filtering foreign matter in the hydraulic oil 2 returned from the hydraulic jack 7 is provided.

The above-mentioned tank 1, valve 4, pump 6, etc. are installed in a machine room 12, and a hydraulic jack 7 is erected in a hoistway 13. A hydraulic jack 7 is provided at the bottom in the hoistway 13. A jack stand 14 for supporting the base 7 is fixedly provided. The hydraulic jack 7 has a plunger 15 that moves up and down in response to the inflow and outflow of the hydraulic oil 2. The plunger 15 is slidably supported by a gland 16. Further, a rope 18 having one end fixed to the jack base 14 is wound around a pulley 17 rotatably attached to an upper end of the plunger 15, and a car 19 is connected to a free end of the rope 18.

In such a hydraulic elevator, the pump 6
Rotates, the hydraulic oil 2 in the tank 1 is sucked through the suction pipe 3, and the foreign matter 9 in the hydraulic oil 2 is filtered by the suction filter 10. Then, the filtered hydraulic oil 2 is pumped by the pump 6. Is sent to the hydraulic jack 7 through the valve 4 and the pipe 5. As a result, the car 19 is driven via the rope 18 by raising the plunger 15 of the hydraulic jack 7, so that the car 19 rises in the hoistway 12. At this time, the car 1 is controlled by controlling the flow rate of the hydraulic oil 2 by the valve 4.
9 is to be adjusted.

When the car 19 descends, the hydraulic oil 2 is discharged from the hydraulic jack 7 to the tank 1 via the pipe 5 and the valve 4, and the plunger 15 descends. At this time, since the hydraulic oil 2 adheres to the surface of the plunger 15, the plunger 15 slides on the cland portion 16, so that the hydraulic oil 2 adhered to the surface of the plunger 15 flows down to show the ground portion 16. After the hydraulic oil 2 has accumulated in the groove, the hydraulic oil 2 is returned from the groove to the tank 1 via the return pipe 8. At this time, when foreign matter such as fibers diffused in the hoistway 12 adheres to the surface of the plunger 15, when the hydraulic oil 2 containing the foreign matter is returned to the tank 1 through the return pipe 8,
Foreign matter in the hydraulic oil 2 is filtered by the drain filter 11.

In the hydraulic elevator configured as described above, when the suction filter 10 that filters foreign substances 9 in the hydraulic oil 2 supplied from the tank 1 is clogged, cavitation occurs inside the hydraulic pump 6. As a result, vibration and noise are generated, so that the suction filter 10 is periodically cleaned. As described above, when cavitation occurs and reaches a level that can be felt by a person even in the car 19 and in front of the machine room 12, there is a problem that discomfort is given. Further, if the suction filter 10 is clogged beyond a certain level, the car 19 stops while traveling and does not reach the destination floor, resulting in an accident that passengers are trapped in the car 19. Therefore, it is necessary to periodically perform the cleaning operation of the suction filter 10 as described above.

In the above-described conventional technique, when performing the cleaning operation of the suction filter 10, the operator has to insert both hands up to the vicinity of the shoulder into the hydraulic oil 2 in the tank 1, which is extremely difficult. Therefore, in order to reduce the frequency of performing this cleaning work, the cause of clogging of the suction filter 10 was investigated, and it was found that fibrous foreign matter adhered to the suction filter 10 to accelerate clogging and that the fiber It has been confirmed by an experiment that the foreign matter flows from the ground portion 16 of the hydraulic jack 7.

When the mesh size of the drain filter 11 is larger than the mesh size of the suction filter 10 in the tank 1 (ie, coarse), the amount of fibrous foreign matter flowing into the tank 1 increases, and the suction amount increases. Experiments also confirmed that clogging of the filter 10 was accelerated.

When the drain filter 11 itself is clogged, the hydraulic oil 2 accumulates in the return pipe 8, and when this state progresses, the hydraulic oil 2 overflows from the gland 16 of the hydraulic jack 7, Since there is a concern that the drain filter 11 may hang down on the ceiling or side plate of the car 19 and enter the car 19, it is necessary to frequently inspect and clean the drain filter 11 in order to prevent the drain filter 11 from being clogged.

[0012]

Therefore, in the above-described conventional hydraulic apparatus, the mesh of the mesh portion of the drain filter is set to be equal to or less than the mesh of the mesh portion of the suction filter, and the mesh of the drain filter is reduced. By providing a bypass device that guides the hydraulic oil flowing from the return pipe to the tank at the time of clogging, foreign matter such as fibrous material can be prevented from flowing into the tank, and the frequency of cleaning the suction filter can be reduced. A device has been developed which prevents an overflow accident in which hydraulic oil overflows in a hoistway due to clogging of a filter.

However, in the above-mentioned development, iron powder generated during the operation of the hydraulic jack or the like flows into the tank through the return pipe, and the iron powder flowing into the tank is operated by the pump. It has been found that there is a problem that the hydraulic device sometimes becomes unusable by flowing through the suction filter to the control valve or the pump side and damaging equipment such as the control valve.

An object of the present invention is to provide a hydraulic device capable of solving the above-mentioned problems.

[0015]

SUMMARY OF THE INVENTION The object of the present invention is to provide a tank for storing hydraulic oil, a pump for injecting and supplying hydraulic oil in the tank through an injection pipe, and a hydraulic oil operating in response to the inflow and outflow of the hydraulic oil. A jack, a return pipe for returning hydraulic oil from the hydraulic jack to the tank, a suction filter for filtering foreign matter in the hydraulic oil supplied from the tank to the suction pipe, and a return pipe for the return pipe. A drain filter for filtering foreign matter in the working oil returned from the hydraulic jack, wherein the mesh of the mesh of the drain filter is set to be equal to or less than the mesh of the mesh of the suction filter, In the hydraulic fluid flowing into the return pipe from the jack and the bypass means for guiding the hydraulic fluid flowing from the return pipe to the tank when the drain filter is clogged It is achieved by the configuration providing a suction means for attracting the iron powder contained.

According to this configuration, the mesh of the mesh portion of the drain filter is set to be equal to or less than the mesh of the mesh portion of the suction filter. When such foreign matter flows into the tank, the foreign matter such as fibrous material is filtered by the mesh portion of the drain filter to prevent the foreign matter from entering the tank. This reduces the necessity of filtering foreign substances such as fibers by the suction filter, thereby reducing the frequency of cleaning the suction filter. In addition, when the drain filter is clogged, the hydraulic oil flowing from the return pipe is guided to the tank by the bypass means, so that an overflow accident in which the hydraulic oil overflows in the hoistway due to the clogged drain filter can be prevented. Moreover, the iron powder in the hydraulic oil that has flowed into the return pipe is adsorbed on the drain filter by the adsorbing means, and is prevented from flowing into the tank.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a hydraulic apparatus according to an embodiment of the present invention.

FIG. 1 is a sectional view showing a part of a drain filter provided in a hydraulic device according to an embodiment of the present invention.
FIG. 2 is a front view showing a hydraulic device power unit portion of the present embodiment. In FIGS. 1 and 2, the same components as those shown in FIG. 3 described above are denoted by the same reference numerals.

The hydraulic device according to the present embodiment shown in FIG. 1 is different from the conventional one shown in FIG.
1 is mainly different, and other configurations are basically the same. The drain filter 11 includes a cylindrical housing 21, a cylindrical inner filter body 22, an outer filter body 23 housed in the housing 21, and a housing 21.
And a lid 24 detachably attached to the upper end of the cover.

The above-mentioned housing 21 has an opening on the upper surface and a discharge port 21a for discharging the hydraulic oil 2 to the tank 1 at the lower part of the side face. This discharge port 21a is connected to the receiving port 1a of the tank 1. It is connected via a tube 25.

The above-mentioned inner filter body 22 and outer filter body 23 are doubly arranged, that is, the outer filter body 23 is provided so as to surround the inner filter body 22 having a small diameter. The inner filter body 22 is provided with a mesh portion 26 made of a net-like member on the other surface with an open upper surface, and a flange 27 in the circumferential direction from the upper end of the inner filter body 22.
And a through hole 28 is formed in the upper part of the mesh part 26. The outer filter body 23 is similarly configured, and has a mesh part 26a, a flange part 27a, and a through hole 28a. Further, the mesh portions 26, 2
The mesh of the mesh 6a is set to be equal to or smaller than the mesh of the mesh 10a of the suction filter 10, that is, equal to or smaller than the mesh of the mesh 10a. Magnetic bodies 31 and 31A such as magnets for adsorbing iron powder contained in the hydraulic oil 2 are fixed to the inner bottoms of the inner filter body 22 and the outer filter body 23, respectively. A magnetic body 31 </ b> B that adsorbs iron powder contained in the hydraulic oil 2 is also fixed to the inner bottom of the housing 21.

The above-mentioned lid 24 has a receiving port 29 for receiving the hydraulic oil 2 returned through the return pipe 8, and the lid 24 is fixed by the fixture 30 while being provided at the upper end of the housing 21. It is fixed to the housing 21.

In the present embodiment, the hydraulic oil 2 is returned from the ground portion 12 of the hydraulic jack 7 in FIG.
When the hydraulic oil 2 is returned, the hydraulic oil 2 flows into the housing 21 from the receiving port 29 in the upper part of the drain filter 11, and foreign matter such as dust mixed in the hydraulic oil 2 when passing through the mesh portion 26 of the inner filter body 22. Is filtered and hydraulic oil 2
The iron powder mixed into the magnetic material 31 is adsorbed on the magnetic material 31. Next, foreign substances such as dust mixed in the hydraulic oil 2 are also filtered when passing through the mesh portion 26a of the outer filter body 23, and then the filtered hydraulic oil 2 accumulates at the bottom of the storage body 21 and is stored. The hydraulic oil 2 is discharged from the discharge port 21 a of the body 21, and is guided into the tank 1 from the receiving port 1 a via the connection pipe 25. The iron powder not adsorbed to the magnetic body 31 of the inner filter body 22 is removed by the magnetic body 31A of the outer filter body 23.
Or, it is adsorbed on the magnetic body 31B of the storage body 21,
It can be prevented from flowing into the tank 1.

In this way, when foreign matter gradually adheres to the inside of the mesh portion 26 of the inner filter body 22 and the mesh portion 26 is clogged, the hydraulic oil 2 gradually accumulates inside the mesh portion 26. Next, when the liquid level of the hydraulic oil 2 reaches the upper part of the mesh part 26, the hydraulic oil 2 passes through the through hole 28 in the upper part of the mesh part 26, and the outside of the mesh part 26, that is, the outer filter body 23 Flows into the inside of the mesh portion 26a. The same applies to the case where foreign matter adheres to the inside of the mesh portion 26a of the outer filter body 23 and the mesh portion 26a is clogged.

In the embodiment configured as described above, when foreign matter such as fiber is returned into the tank 1 together with the hydraulic oil 2 from the ground portion 16 of the hydraulic jack 7 in FIG. The foreign matter tank 1 is filtered through the mesh portions 26 and 26a of the fine drain filter 11
Since the intrusion into the inside is prevented, it is possible to reduce the necessity of filtering the foreign matter with the suction filter 10, thereby reducing the frequency of cleaning the suction filter 10. Moreover, the ground portion 16 of the hydraulic jack 7
The iron powder flowing into the return pipe 8 together with the hydraulic oil from
The magnetic substances 31, 31A and 31B are not attracted to the tank 1 and flow into the tank 1, thereby preventing damage to devices such as the control valve.

In this embodiment, the drain filter 1
When the mesh portions 26 and 26a are clogged, the hydraulic oil 2 flowing into the return pipe 8 or the drain filter 11
Since the fluid is bypassed through the passages 8 and 28a and guided to the tank 1 from the inside of the housing 21, it is possible to prevent an overflow accident in which the hydraulic oil 2 overflows into the hoistway 12 in FIG.

In the present embodiment, the drain filter 1
Since the mesh portions 26 and 26a have a double structure, the filtration area of the mesh portions 26 and 26a can be increased without increasing the size of the drain filter 11, so that the size of the drain filter 11 can be reduced and the drain filter can be reduced. 11 can be reduced in cleaning frequency. Further, the fixture 30 of the drain filter 11 is removed and the lid 2 is removed.
4 is removed from the housing 21, the inner filter body 22,
The outer filter body 23 is taken out and the mesh portions 26 and 26a are taken out.
The worker can check the tank 1
Inspection work of the drain filter 11 can be easily performed as compared with the case where the suction filter 10 is inspected by being inserted into the hydraulic oil 2 inside.

In this embodiment, the drain filter 1
The hydraulic oil 2 which is provided so as to surround the peripheries of the through holes 28 and 28a provided in each part of the first mesh portions 26 and 26a and the mesh portions 26 and 26a and flows out through the through holes 28 and 28a is stored in a tank. The container 21 that guides the hydraulic oil 2 flowing from the return pipe 8 to the tank 1 when the drain filter 11 is clogged is constituted by the storage body 21 that guides the hydraulic oil 2 to the tank 1.

Furthermore, in the present embodiment, a description has been given of a hydraulic elevator having the hydraulic jack 7 as an actuator, but the same applies to other hydraulic devices.
Further, in the present embodiment, the magnetic body 31 formed of a magnet or the like,
31A is provided at the inner bottom of the inner filter body 22 and the outer filter body 23, but is not limited thereto.
The inner filter body 22 and the outer filter body 23 may be formed of a magnetic material.

[0030]

As described above, according to the present invention, the hydraulic oil returned from the ground portion of the hydraulic jack is filtered (from the suction filter) through the mesh portion of the fine drain filter. Since it is possible to prevent foreign matters mixed in the oil from entering the tank, the necessity of filtering foreign matters in the hydraulic oil in the tank by the suction filter is reduced, and the frequency of cleaning the suction filter can be reduced. In addition, since the hydraulic oil flowing from the return pipe when the drain filter is clogged is guided to the tank by the bypass means, it is possible to prevent an overflow accident in which the hydraulic oil overflows in the hoistway due to the clogging of the drain filter. Further, it is possible to reliably remove the operating iron powder returned from the hydraulic jack and prevent damage to the control valve and the pump.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a part of a drain filter provided in a hydraulic elevator according to an embodiment of the present invention.

FIG. 2 is a front view showing a power unit of the hydraulic device according to the embodiment.

FIG. 3 is an explanatory view showing a general hydraulic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 2 Hydraulic oil 3 Suction pipe 5 Pipe 6 Pump 8 Return pipe 10 Suction filter 10a Mesh part 11 Drain filter 21 Storage body 21a Outlet 22 Inner filter body 23 Outer filter body 24 Lid body 26, 26a Mesh body 27, 27a Collar Part 28, 28a Through hole 29 Receiving port 31, 31A, 31B Magnetic body

Claims (3)

[Claims] 1. A tank for storing hydraulic oil, a pump for injecting and feeding hydraulic oil in the tank through an injection pipe,
A hydraulic jack that operates according to the inflow and outflow of the hydraulic oil,
A return pipe for returning hydraulic oil from the hydraulic jack to the tank, a suction filter for filtering foreign substances in the hydraulic oil supplied from the tank to the suction pipe, and a hydraulic pipe from the hydraulic jack to the return pipe. A drain filter for filtering foreign matter in the returned hydraulic oil, and setting the mesh size of the mesh portion of the drain filter to be equal to or less than the mesh size of the mesh portion of the suction filter, A hydraulic device provided with bypass means for guiding hydraulic oil flowing from the return pipe to the tank at the time of clogging and suction means for absorbing iron powder contained in hydraulic oil flowing from the jack into the return pipe; . 2. A method according to claim 1, wherein said bypass means is provided with a through hole provided above a mesh part of said drain filter and a hydraulic oil which is provided so as to surround a periphery of said mesh part and flows out through said through hole to said tank. The hydraulic device according to claim 1, wherein the hydraulic device is configured to include a guiding body. 3. The drain filter according to claim 1, wherein the mesh portion of the drain filter comprises an inner mesh portion having a small diameter and at least one or more outer mesh portions provided to surround the inner mesh portion. Hydraulic device as described.