US3606243A - Device for preventing noise in an oil-hydraulic elevator - Google Patents

Device for preventing noise in an oil-hydraulic elevator Download PDF

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Publication number
US3606243A
US3606243A US857419A US3606243DA US3606243A US 3606243 A US3606243 A US 3606243A US 857419 A US857419 A US 857419A US 3606243D A US3606243D A US 3606243DA US 3606243 A US3606243 A US 3606243A
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US
United States
Prior art keywords
oil
spool
control valve
cage
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US857419A
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English (en)
Inventor
Ken Ichiryu
Humio Hujisawa
Mitsuaki Takenoshita
Hiroshi Yumino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
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Hitachi Ltd
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Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
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Publication of US3606243A publication Critical patent/US3606243A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/24—Control systems with regulation, i.e. with retroactive action, for influencing travelling speed, acceleration, or deceleration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
    • B66B1/36—Means for stopping the cars, cages, or skips at predetermined levels
    • B66B1/40—Means for stopping the cars, cages, or skips at predetermined levels and for correct levelling at landings
    • B66B1/405—Means for stopping the cars, cages, or skips at predetermined levels and for correct levelling at landings for hydraulically actuated elevators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/008—Reduction of noise or vibration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86718—Dividing into parallel flow paths with recombining
    • Y10T137/86743—Rotary
    • Y10T137/86751—Plug

Definitions

  • a device for preventing noise in an oil-hydraulic elevator having an oil-hydraulic circuit including a rotary oil flow control valve comprising a rotary spool in the shape of a cylinder rotatably received in a sleeve, said spool and sleeve each having a pair of oppositely arranged openings adapted to define a pair of oppositely arranged valve ports when said spool is positioned at a proper angular position with respect to said sleeve, said valve ports allowing two oil jets opposing to each other, the method being characterized by preventing cavitation at an outlet region of said valve ports due to collision of said two jets by keeping the oil pressure at said region in a range of 0.5- kg./ cm. Such an oil pressure in said region is kept by providing a bullet-shaped guide member or a baflle plate at said region or
  • This invention relates to a means for preventing noise in an oil-hydraulic elevator, and more particularly a means for preventing noise perceived in a cage of an oil-hydraulic elevator due to cavitation caused by the exhaust of oil through a rotary oil flow control valve provided in an exhausting line of an oil-hydraulic system of the elevator.
  • This invention depends upon the understanding of the above-mentioned phenomenon and has a first object to prevent the generation of the cavitation at an outlet region of a rotary flow control valve thereby to reduce the noise perceived in a cage of an oil-hydraulic elevator.
  • a second object is to obtain means effective for preventing the generation of the cavitation in a rotary oil flow control valve.
  • the above-mentioned first object is accomplished, according to this invention, by keeping and oil pressure in a range of 0.5-5.0 kg./cm. more preferably 1-3 kg./ cm. at an outlet region of a rotary oil flow control valve.
  • FIG. 1 is a diagram showing an oil-hydraulic system of an elevator with which this invention is concerned;
  • FIG. 2 is an axial section of an essential part of a conventional rotary oil flow control valve used in the system shown in FIG. 1;
  • FIGS. 3 and 4 are somewhat reduced cross sections taken along line A--A in FIG. 2, wherein FIG. 3 shows a fully opened condition and FIG. 4 shows a fully closed condition;
  • FIGS. 5a, 5 b, 5c and 5d show several embodiments of means for preventing cavitation at an oil outlet region of a rotary oil flow control valve; and 1 FIG. 6 is a graph showing a comparison of the noises in a cage of an oil-hydralulic elevator with and without incorporating this invention.
  • Oil for operating the plunger is fed by a pump 5 driven by a motor 4 from an oil reservoir 6 via a strainer 7 and suction and delivery pipe lines 8 and- 9. From the delivery pipe 9 is branched a relief pipe line .10 which is returned to the reservoir 6 via an oil flow control valve 11 and an exhausting pipe line 12.
  • the oil flow control valve 11 is adapted to be driven by a motor 13 and when it is fully opened, the oil delivered by the pump 5 is all returned to the reservoir 6.
  • a push button (not shown) in the cage for a determined position is pushed, a control means (not shown) is operated and the motor 13 is energized to drive the valve 11 in the direction of closing its port, whereby the oil pressure in the pipe line 10 is increased.
  • This increased pressure overcomes the pressure residing in a pipe line 14 and opens a check valve 15 to flow into the pipe line 14 and further to the cylinder 3.
  • the port area of the control valve 11 is more decreased, the flow of oil entering into the pipe line 14 is increased, whereby the movement of the cage 1 is accelerated.
  • the control valve 11 is fully closed, the cage reaches its highest velocity, and the motor 13 is stopped at this time.
  • a limit switch (not shown) provided in a passage of the cage 1 is actuated, whereby said control means is operated and the motor 13 is reversedly energized to drive the control valve 11 in the direction of opening its port.
  • the control valve 11 is then fully opened at such time when the cage 1 is just stopped at the predetermined position, wherein the oil in the pipe line 14 and the cylinder 3 is kept suspended by the check valve 15 being closed, and the oil pumped by the pump 5 is all exhausted through the pipe line 10.
  • a push button (not shown) in the cage for the second determined position is pushed, whereby an electromagnetic valve 17 in a branch pipe line 16 is opened to expose the underside of a check valve 19 holding the oil in the pipe line 14 to the oil pressure residing in the pipe line 14 thereby to open the check valve 19.
  • a motor 21 of an oil flow control valve 22 provided in an exhausting pipe line 20 of the check valve 19 is energized to drive the control valve 22 in the direction of opening its port. Accordingly, the oil in the cylinder 3 is exhausted through the pipe line 14, check valve 19, pipe line 20, control valve 22 and drain pipe line 23 to the oil reservoir 6 thereby to let down the cage 1.
  • FIGS. 2, 3 and 4 show the oil flow control valve 11 in detail.
  • the control valve 11 comprises a rotary spool 31 in the shape of a cylinder closed at one end and having a pair of oppositely arranged openings 30 and a sleeve 33 firmly mounted in a valve body 32 and rotatably carrying the spool therein.
  • the sleeve 33 has a pair of oppositely arranged openings 32 which are adapted to meet with the openings 30 of the spool when the spool is at a proper angular position.
  • the spool 31 has a sprocket wheel 35 which is driven by the motor 13 via an endless chain 36.
  • Reference numeral 34 shows a bearing.
  • the spool '31 is rotated from the position as shown in FIG. 3 where the openings 30 and 32 are superposed toward the position as shown in FIG. 4 where the openings 30 are shifted apart from the openings 32.
  • the spool 31 is returned from the position shown in FIG. 4 to the position shown in FIG. 3 by being rotated in a reversed direction.
  • the oil flow control valve 22 is the stame as the control valve 11, except that the control valve 22 is normally closed and temporarily opened when the cage is moved downward, while the control valve 11 is normally opened and temporarily closed when the cage is moved upward.
  • this invention provides an improved rotary oil flow control valve in which the generation of the cavitation is efiectively avoided.
  • a bullet-shaped guide member 40 is provided in the spool 31 in a manner that the back pressure at an outlet region of the openings 30 is kept in a range of 0.5-5.0 kg./cm. If the back pressure is lower than 0.5 kg./cm. it cannot effectively suppress the generation of cavitation, While it the back pressure becomes more than 5 kg./cm. it influences the outlet velocity of oil and causes unstable movement of the cage. An optimum back pressure is in a range of 1-3 kg./cm.
  • the required back pressure is produced by providing a contracted portion 41 in the exhausting pipe line 12 (or 23).
  • This embodiment shows a substantially same effectiveness as that shown in FIG. 5a.
  • a third embodiment shown in FIG. 50 employs a cock, stop valve or other throttling means 42 for common usage.
  • the throttling means may be used in singularity or in plurality in a proper combination.
  • the cock, stop valve or other throttling means has a relatively smooth flow passage and the flow resistance thereof is not too high, almost no cavitation is generated. In other cases, it is preferable that the back pressure is somewhat increased.
  • FIG. 5d shows still another embodiment wherein a bafile plate 43 is provided in the spool 31.
  • a bafile plate 43 is provided in the spool 31.
  • this embodiment there occurs a little cavitation at the outlet region of the openings 30, but since it is very weak, it causes almost no such noise as is transmitted so far to the cage.
  • An experiment with this structure showed that the noise measured in a cage was lowered as much as about 6 phons.
  • cavitation is suppressed mainly by the effect of back pressure
  • cavitation is suppressed by the effect of back pressure as well as by preventing vortex flow and thereby avoiding negative pressure caused at the center of vortex. Therefore, the embodiments shown in FIGS. 5a and 5d are effective for cases where strong cavitation is anticipated.
  • FIG. 6 shows a comparison of the noises in a cage of an oil-hydraulic elevator with and without incorporating this invention, wherein the abscissa represents frequency of noise and the ordinate represents intensity of noise.
  • a solid line in the graph shows a noise spectrum measured in a cage of a conventional oil-hydraulic elevator when it is descending, and a broken line shows the same spectrum in a case of incorporating this invention in the form of the embodiment of FIG. 5a 50 that said back pressure becomes 2 kg./cm.
  • the noise is reduced as much as about 8 phons. This result is also applied to the case when the cage is elevating, and can also be attained by the embodiments of FIGS. 5b, 5 c and 5d.
  • Device for eliminating noise in an oil-hydraulic circuit adapted to control the moving velocity of an elevator and including a rotary oil flow control valve comprising a rotary spool in the shape of a cylinder closed at one end and having a pair of oppositely arranged openings, and a sleeve mounted in a valve body and carrying said spool rotatably therein, said sleeve having a pair of oppositely arranged openings adapted to meet with said openings of said spool when said spool is positioned in a proper angular position, characterized in that said device is provided with means in the flow path from the openings for keeping the oil pressure at the open outlet region of said spool in a range of 0.5 kg./cm. to 5.0 kg./cm.
  • said means includes a bullet-shaped guide member within said spool so as to keep the oil pressure at the open outlet region of said spool in a range of 0.5 kg./cn1. to 5.0 kg./cm.
  • said means includes a bafiie plate within said spool so as to keep the oil pressure at the open outlet region of said spool in a range of 0.5 kg/cm. to 5.0 kg./c1n. and to decrease the extent of cavitation therein.
  • said means includes throttling means at an exhausting pipe line connected to the outlet region of said valve.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Types And Forms Of Lifts (AREA)
  • Elevator Control (AREA)
US857419A 1968-09-13 1969-09-12 Device for preventing noise in an oil-hydraulic elevator Expired - Lifetime US3606243A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6555968 1968-09-13

Publications (1)

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US3606243A true US3606243A (en) 1971-09-20

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DE (1) DE1945891C3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5492451A (en) * 1994-10-03 1996-02-20 Caterpillar Inc. Apparatus and method for attenuation of fluid-borne noise
US5555726A (en) * 1995-03-31 1996-09-17 Caterpillar Inc. Attenuation of fluid borne noise from hydraulic piston pumps
US5560205A (en) * 1994-12-21 1996-10-01 Caterpillar Inc. Attenuation of fluid borne noise

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2646294C2 (de) * 1976-10-14 1987-02-26 C. Haushahn GmbH & Co, 7000 Stuttgart Hydraulische Antriebsvorrichtung für einen Aufzug

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5492451A (en) * 1994-10-03 1996-02-20 Caterpillar Inc. Apparatus and method for attenuation of fluid-borne noise
US5560205A (en) * 1994-12-21 1996-10-01 Caterpillar Inc. Attenuation of fluid borne noise
US5555726A (en) * 1995-03-31 1996-09-17 Caterpillar Inc. Attenuation of fluid borne noise from hydraulic piston pumps

Also Published As

Publication number Publication date
DE1945891C3 (de) 1975-01-16
DE1945891A1 (de) 1970-05-21
DE1945891B2 (de) 1972-11-02

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