JP2009115221A - Pulsation-reducing device in hydraulic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: when an accumulator is connected in a pipe so as to reduce pulsations from a motor pump, the hydraulic equipment requires a larger installation space to be upsized, also requires high costs, and in the case where a hose made of flexible material is used for the pipe, a breakdown is caused in the hydraulic system such as a safety device, etc. in the pressure control valve to cause high-pressure oil-flow in the hose, and a fracture is induced. <P>SOLUTION: The pulsation reducing device is provided somewhere in a pipeline of the hydraulic circuit of a hydraulic device, and includes: an oil reservoir G communicating with an oil flow-path; and an elastic film 2d that is made of rubber, etc., and deformed by hydraulic pressure of the oil reservoir. Deformation of the elastic film absorbs pulsating pressures of the oil coming from the motor pump B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention reduces pulsation generated from a motor pump in a hydraulic device such as a hairdressing chair, dental chair, operating table, etc. The present invention relates to a pulsation reducing device in a hydraulic device for reducing noise.

  As a conventional pulsation reducing device, there is an invention disclosed in, for example, Japanese Patent Application Laid-Open No. 11-230103, which uses an accumulator that reduces pulsation generated in a pipe through which high-pressure oil passes. For example, there is an invention disclosed in Japanese Patent Application Laid-Open No. 2001-317681 in which a softened hose is connected to a pipe through which the slag flows and pulsation is absorbed by utilizing the contraction of the hose.

  An outline of the accumulator in the former invention is as follows: a casing comprising a large-diameter large chamber communicating with a pipe through which a pumping fluid passes, and a small-diameter child chamber formed communicating with the large chamber; An accumulator comprising a piston comprising a large-diameter portion that moves and a small-diameter portion that slides within the child chamber, and a spring disposed between a step portion between the large-diameter portion and the small-diameter portion and the casing. When the hydraulic pressure with high pulsation is applied to the large chamber of the casing, the piston moves backward against the spring force of the spring, and when the pressure decreases, the piston returns by the spring force of the spring to absorb the pulsating hydraulic pressure. Is.

The latter invention uses heat shrinkage during vulcanization of the braided yarn to make rubber protrude from the stitches and form an uneven surface due to the bulging portion on the inner peripheral surface. When the protruding portion contracts and the pressure decreases, the bulging portion returns to its original state to absorb the pulsating hydraulic pressure.
Japanese Patent Laid-Open No. 11-230103 JP 2001-317681 A

  By the way, when the accumulator described above is connected in the piping path, there is a problem that a hydraulic device becomes large in size and costs are increased, and when a flexible material hose is used for the piping. Has a problem that the hydraulic system of a safety device such as a pressure control valve breaks down and is damaged when high-pressure oil flows into the hose.

  The present invention is intended to solve the above-described problems, and its purpose is to reduce pulsation of discharged oil from the motor pump by simply incorporating it in the motor pump, in the piping path, and in the solenoid valve unit. Pulsation in hydraulic equipment that can be freely selected, and can be freely selected, and can be space-saving because of its small size and its structure is simple, so that cost can be reduced. It is supposed to provide a mitigation device.

  The pulsation reducing device for hydraulic equipment according to the present invention is intended to achieve the above-mentioned object, and the means of claim 1 is provided in any part of the piping of the hydraulic circuit in the hydraulic operating device and communicates with the oil flow path. An oil reservoir and an elastic film made of rubber or the like that is deformed by the oil pressure of the oil reservoir are provided, and the oil pulsation pressure from the motor pump is absorbed by the deformation of the elastic film.

  The means of claim 2 is provided in any part of the piping of the hydraulic circuit in the hydraulic actuator, and an oil reservoir that communicates with the oil flow path, and an elastic film such as rubber that is deformed by the oil pressure of the oil reservoir, An elastic member is disposed on the opposite side of the elastic membrane from the oil reservoir and urges the elastic plate toward the oil reservoir, and the pulsating pressure of oil from the motor pump is applied to the elastic membrane. Absorbing by deformation.

  According to a third aspect of the present invention, in the above first and second aspects, the oil reservoir is connected to an oil flow path between the motor pump and the electromagnetic valve.

  According to a fourth aspect of the present invention, in the first and second aspects described above, the oil reservoir is integrally provided on the oil outlet side of the motor pump. In the first and second aspects described above, the oil reservoir is integrally provided on the oil inlet side of the solenoid valve unit.

  As described above, the present invention is provided in any part of the piping of the hydraulic circuit that drives the hydraulic equipment, and an oil reservoir that communicates with the oil flow path, and an elastic film such as rubber that is deformed by the oil pressure of the oil reservoir. And the pulsating pressure of oil from the motor pump is absorbed by the deformation of the elastic membrane, so that vibration and noise due to the pulsating component are not generated during the operation. Does not cause discomfort

  Also, the pulsation reducing device can be installed in any of the motor pump, solenoid valve unit, built-in pipe nipple connecting the motor pump and solenoid valve, etc. Optimum design is possible, and further, the structure is simpler than that using the accumulator shown in the background art, and the size can be reduced.

  In the present invention, when pulsating oil from a motor pump flows in, an elastic film urged by an elastic member such as a spring is deformed to absorb the oil pulsation and make a flat oil flow.

Hereinafter, an embodiment of a pulsation reducing device for hydraulic equipment according to the present invention will be described with reference to the drawings.
1 and 2 show a pulsation reducing device A, which is composed of a first housing 1 and a second housing 2 made of a metal material that is difficult to corrode. The first housing 1 is a motor pump of a hydraulic device. It is connected to the oil discharge port B3 or connected to an oil inflow port into which oil from the motor pump of the solenoid valve unit flows.

  In addition, the first housing 1 is formed with an oil outlet 1b connected to the oil inlet of the solenoid valve unit or connected to the other end of the pipe having one end connected to the inlet to the solenoid valve unit side. Has been. And the said oil inflow port 1a and the oil outflow port 1b are connected to the flow path 1c opened in T shape. Note that the remaining one flow channel (hereinafter referred to as an oil reservoir G) of the flow channel 1c that is not connected to the oil inlet 1a and the oil outlet 1b is opened in the second housing 2.

  One end of the second housing 2 is closed and a screw hole 2a is formed at the other end. The screw hole 2a is integrated with the outer peripheral screw 1d of the oil reservoir G by screwing. An elastic member 2b in which a plurality of disc springs are stacked is housed in a hole on the closing side of the second housing 2, and a presser fitting 2c urged by the elastic member 2b is slidably incorporated therein. Yes. Further, an elastic film 2d made of an elastic member such as urethane rubber whose outer peripheral edge portion is fixed when the first and second housings are screwed is attached to the surface of the press fitting 2c on the oil reservoir G side.

  Therefore, the pulsating oil from the motor pump flows in from the oil inlet 1a, flows toward the oil outlet 1b, and flows toward the piping and the electromagnetic valve. Due to the inflow of oil, the elastic membrane 2d is deformed along with the change in hydraulic pressure.

  Next, the operation will be described in detail with reference to the drawings of FIGS. The structure shown in FIGS. 3 and 4 is slightly different from the structure shown in FIGS. 1 and 2 in principle, but is the same in principle, and will be described together with FIGS. In addition, the same member as above-mentioned FIG. Although the elastic member 2e is shown as a stack of a plurality of disc springs, the elastic member 2e may be a spring. Although not shown, the first and second housings 1 and 2 are not shown. It is screwed at the outer periphery of the collar and integrated.

  Next, in order to explain the operation of the pulsation reducing device A in this configuration, when pulsating oil is sent from the motor pump, it flows toward the solenoid valve, but the oil stays in the oil reservoir G. When the pulsating oil in the oil passage B2 becomes high and the oil pressure in the oil reservoir G becomes high, the elastic film 2d compresses and deforms the elastic member 2e through the presser fitting 2c, and the high-pressure flow in the oil passage B2 becomes the oil inlet. 1f flows into the oil reservoir G and absorbs the high-pressure flow (see FIG. 4). When the oil pressure in the oil passage B2 decreases, the elastic film 2d returns to its original state via the presser fitting 2c by the elastic member 2e. The oil in the oil reservoir G is returned to the oil passage B2 from the oil inlet 1f (see FIG. 3). Therefore, the oil of the pulsation pressure from the motor pump is discharged from the pulsation reducing device A in an average hydraulic pressure state.

FIG. 5 shows an embodiment in which the pulsation reducing device A shown in FIGS. This is the case of the pulsation reducing device A3 of the hydraulic circuit in FIG.
B is a motor pump in which the motor unit and the gear pump unit B1 are integrated and integrated, and when the motor unit rotates, the gear pump rotates and sucks oil in the oil tank from the suction port to generate pressurized pulsating oil. The oil is supplied from the oil passage B2 to the oil inlet 1a of the pulsation reducing device A through the outlet B3. Then, pulsating oil in which the oil from the oil tank is pressurized by the gear pump enters the oil reservoir G through the oil inlet 1a from the discharge port B3, and in the case of high-pressure oil, the elastic membrane 2d is pressed by the oil. In the case of low pressure oil, the elastic membrane 2d is restored by the spring force of the elastic member 2e, and the oil in the oil reservoir G is made uniform through the oil outlet 1b. It will be supplied to the solenoid valve side as oil with high pressure. Therefore, hydraulic equipment such as a barber / beauty chair moves up and down without causing pulsation vibration and without generating noise.

FIG. 6 shows another embodiment in which the pulsation reducing device A shown in FIGS. 3 and 4 of the present invention is attached to the motor pump B. This is the case of the pulsation reducing device A1 for the hydraulic circuit in FIG.
In this embodiment, the oil passage B2 formed in the lower part of the motor pump B is attached so that the oil inlet 1f in the first housing 1 is opened, and the oil from the oil tank is supplied by the gear pump. Pressurized pulsating oil enters oil reservoir G from oil passage B2, and in the case of high pressure oil, elastic membrane 2d is pressed and deformed by the oil to absorb high pressure oil, and in the case of low pressure oil, it is elastic. The membrane 2d is restored by the spring force of the elastic member 2e, and the oil in the oil reservoir G is returned to the oil passage B2, and the pulsating oil is made into uniform pressure oil from the discharge port B3 of the gear pump B1 (or oil passage B2) It supplies to a solenoid valve via. Therefore, hydraulic equipment such as a barber / beauty chair moves up and down without causing pulsation vibration and without generating noise.

FIG. 7 shows an embodiment in which the pulsation reducing device A shown in FIGS. 3 and 4 of the present invention is attached to the electromagnetic valve unit C. This is the case of the pulsation reducing device A2 for the hydraulic circuit in FIG.
The solenoid valve unit C in this embodiment, for example, unlocks the solenoid valves C1 and C2 for raising and lowering the seat portion of the barber / beauty chair, the solenoid valves C3 and C4 for raising and lowering the backrest, and the rotation of the seat portion. The pulsation reducing device A of the present invention is incorporated on the pipe side to which the pulsating oil from the motor pump B among these five is fed. Also in this embodiment, the pulsating oil is supplied to the solenoid valves C1 and C3 with the oil pressure made uniform by the above-described operation, so that pulsation vibration does not occur when the seat is raised and lowered and the backrest is raised and lowered. And no noise is emitted.

  As the pulsation reducing device A attached to the motor pump B shown in FIG. 6 or the electromagnetic valve unit C shown in FIG. 7, the first housing 1 is made of a member constituting the motor pump B or the electromagnetic valve unit C. A screw hole for screwing and fixing the second housing 2 is formed in the first housing, and the male screw and the elastic film 2d formed on the outer periphery of the second housing 2 are formed. It is good also as a shape screwed and fixed so that it might clamp.

  Further, even if the pulsation reducing device A is connected to the piping connecting the motor pump B and the electromagnetic valve unit C in FIG. 8, the same as when the pulsation reducing device A is incorporated in the motor pump B and the electromagnetic valve unit C described above. The hydraulic device does not cause pulsation vibration due to the operation, and no oil is generated because oil is supplied in a state where the pulsation is eliminated.

1 is a perspective view of a pulsation reducing device according to the present invention. It is sectional drawing same as the above. It is sectional drawing when the pulsation oil in the pulsation reduction apparatus of another Example is a constant pressure. It is sectional drawing at the time of the high pressure of the pulsating oil same as the above. FIG. 3 is a perspective view of a state in which the pulsation reducing device of FIGS. 1 and 2 is incorporated on the oil outflow side of the motor pump. It is a perspective view of the state which integrated the pulsation reduction apparatus of FIG. 3, FIG. 4 in the motor pump integrally. FIG. 5 is a perspective view of a state in which the pulsation reducing device of FIGS. 3 and 4 is integrally incorporated in an electromagnetic valve unit. FIG. 8 is a hydraulic circuit in a state connected to the motor pump, the electromagnetic valve unit, and the piping in FIGS.

Explanation of symbols

A pulsation reducing device B motor pump C solenoid valve unit 1 first housing 1a oil inlet 1b oil outlet 2 second housing 2b, 2e elastic member 2c presser fitting 2d elastic membrane

Claims (5)

Provided in any part of the piping of the hydraulic circuit in the hydraulic actuator, and includes an oil reservoir that communicates with the oil flow path, and an elastic film such as rubber that is deformed by the oil pressure of the oil reservoir. A pulsation reducing device in a hydraulic device, which absorbs pulsation pressure of oil by deformation of the elastic membrane. An oil reservoir provided in any part of the piping of the hydraulic circuit in the hydraulic actuator, an oil reservoir that communicates with the oil passage, an elastic film such as rubber that is deformed by the oil pressure of the oil reservoir, and the oil reservoir of the elastic film And an elastic member that biases the elastic plate toward the oil reservoir and absorbs the pulsating pressure of oil from the motor pump by deformation of the elastic film. Pulsation reduction device for hydraulic equipment. 3. The pulsation reducing device for hydraulic equipment according to claim 1, wherein the oil reservoir is connected to an oil passage between a motor pump and a solenoid valve. 3. The pulsation reducing device for hydraulic equipment according to claim 1, wherein the oil reservoir is integrally provided on an oil outlet side of the motor pump. 4. 3. The pulsation reducing device for hydraulic equipment according to claim 1, wherein the oil reservoir is integrally provided on the oil inlet side of the solenoid valve unit. 4.

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