JP3549571B2 - Hydraulic unit - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an operation in which a hydraulic pump rotationally driven by an electric motor sucks and discharges a storage hydraulic oil in an oil tank, reduces a pulsating flow of the hydraulic oil with a hydraulic muffler, and supplies the hydraulic oil to an external load or discharges the external load. The present invention relates to a hydraulic unit for reducing the pulsating flow of oil by a hydraulic muffler and recirculating the oil into an oil tank, and particularly to a hydraulic unit suitable as a drive source of a residential hydraulic elevator.
[0002]
[Prior art]
FIG. 4 shows such a hydraulic unit as disclosed in Japanese Patent Application No. 5-154124 filed by the applicant. The hydraulic pump 24 is driven to rotate by an electric motor 23 to suck and discharge the stored hydraulic oil in an oil tank 25. The hydraulic oil discharged from the hydraulic pump 24 is controlled by the control valve 26, reduces the pulsating flow by the hydraulic muffler 27, flows through the second supply / discharge pipe 28, and is supplied to a single-acting hydraulic cylinder as an external load (not shown). The house hydraulic elevator is provided to operate ascending. Further, the hydraulic pump 24 is stopped, and the operating oil discharged from the single-acting hydraulic cylinder by the self-weight of the residential hydraulic elevator flows through the second supply / discharge pipe 28, the pulsating flow is reduced by the hydraulic muffler 27, and the control valve 26 is controlled. To return to the oil tank 25 from the return pipe 29 to lower the residential hydraulic elevator.
[0003]
[Problems to be solved by the invention]
However, in the hydraulic unit having such a configuration, the plate-like flange member 30 constituting the upper end of the hydraulic muffler 27 is mounted on the mounting portion 31 of the oil tank 25, and is detachably fixed by a plurality of bolt members 32. Therefore, there is a problem that the vibration of the hydraulic muffler 27 generated due to the pulsating flow due to the introduction of the hydraulic oil is transmitted to the oil tank 25, and the operation noise is increased by resonance.
SUMMARY OF THE INVENTION The present invention solves such a problem, and an object of the present invention is to provide a hydraulic unit capable of reducing noise by reducing the propagation of vibration from a hydraulic muffler to an oil tank.
[0004]
[Means for Solving the Problems]
For this reason, the present invention provides an electric motor and a hydraulic pump that is rotationally driven by the electric motor and inhales and discharges the stored hydraulic oil in the oil tank. operation provided by connecting the control valve or to reflux for controlling the hydraulic fluid discharged from the control hydraulic oil discharged is supplied to the external load or external load in the oil tank is supplied to the external load the hydraulic muffler to reduce the oil and pulsating of the working oil discharged from the external load configured into a cylindrical shape mounted to vertically movably to the top plate via oil tank buffer member, the hydraulic muffler first sheet The drain is connected to the control valve and supported, and the hydraulic oil controlled by the control valve is connected to the control valve so as to recirculate into the oil tank. A pipe is provided and the return pipe seals the hydraulic muffler. And it provided, formed by supporting a controlled valve by fixing the hydraulic muffler return pipe.
[0005]
[Action]
In such a configuration of the present invention, the hydraulic muffler generates vibration due to the pulsating flow of the hydraulic oil due to the introduction of the hydraulic oil, and this vibration is absorbed by the buffer member to reduce the propagation to the oil tank. Therefore, the noise of the hydraulic unit can be reduced favorably.
[0006]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 3, reference numeral 1 denotes an oil tank, which is formed in a substantially square shape so as to open upward and store hydraulic oil therein. Reference numeral 2 denotes an upper plate of the oil tank 1, which is fixed to the oil tank 1 with a detachable material so as to close an upper opening of the oil tank 1. Reference numeral 3 denotes an electric motor which is mounted on the upper plate 2 of the oil tank 1 via four cushioning members 4 made of a vibration isolating rubber and fixed detachably. Reference numeral 5 denotes a hydraulic pump integrally connected to the electric motor 3, which is rotatably driven by the electric motor 3 so as to suck and discharge the hydraulic oil stored in the oil tank 1 from the suction pipe 6. The suction pipe 6 is connected to the hydraulic pump 5, is inserted through the upper plate 2 of the oil tank 1, and is provided with one end having a strainer 6A immersed in storage hydraulic oil.
[0007]
Reference numeral 7 denotes a control valve connected to the discharge side of the hydraulic pump 5 for controlling the hydraulic oil discharged from the hydraulic pump 5 to supply the hydraulic oil to a single-acting hydraulic cylinder of a residential hydraulic elevator as an external load (not shown). The hydraulic oil discharged from the mold hydraulic cylinder is controlled so as to recirculate into the oil tank 1. Numeral 8 denotes a hydraulic muffler for reducing the pulsating flow of hydraulic oil supplied to the single-acting hydraulic cylinder and hydraulic oil discharged from the single-acting hydraulic cylinder, which is connected to the control valve 7 via the first supply / discharge pipe 9 and , Are connected to a single-acting hydraulic cylinder via a second supply / discharge pipe 10. The hydraulic muffler 8 is formed by welding a rectangular plate-shaped flange member 12 to the upper end of the cylindrical member 11 by welding and fixing a disk-shaped bottom plate member 13 to the lower end of the cylindrical member 11 by welding. A flange member 12 is exposed to the remaining portion of the upper plate 2 of the oil tank 1 on which the electric motor 3 is mounted, and is vertically mounted via four buffer members 14 to be detachably fixed by four nut members 15. are doing. Accordingly, the hydraulic muffler 8 is disposed in the oil tank 1 by loosely fitting the cylindrical member 11 and the bottom plate member 13 into the insertion holes 2B penetrating the upper plate 2 and immersing the lower ends in the storage hydraulic oil. It is movable with respect to. The first supply / discharge pipe 9 and the second supply / discharge pipe 10 are respectively connected to the flange member 12 of the hydraulic muffler 8 at symmetrical positions via the center thereof and communicate with each other via the hydraulic muffler 8.
[0008]
The four cushioning members 14 are respectively disposed at four corners of the flange member 12 of the hydraulic muffler 8, and as shown in detail in FIG. 3, disk-shaped steel plates 16A and 16B are respectively provided at upper and lower ends of a columnar vibration-isolating rubber 14A. The bolt members 17A and 17B are fixed to the respective steel plates 16A and 16B by welding so as to protrude and fix them. Each buffer member 14 has a bolt member 17B screwed into a screw hole 2A penetrating through the upper plate 2, and a nut member 17A is inserted through a through hole 12A penetrating through the flange member 12 of the hydraulic muffler 8. The member 15 is screwed on, whereby the hydraulic muffler 8 is detachably fixed. Reference numeral 18 denotes a washer member inserted between the steel plate 16B and the upper plate 2 by being inserted into the bolt member 17B. The washer member 18 is provided so that an incomplete screw portion existing at the root portion of the bolt member 17B is not located in the screw hole 2A. Reference numeral 19 denotes a washer member inserted between the bolt member 17A and sandwiched between the flange member 12 and the nut member 15, and the nut member 15 screwed to the bolt member 17A is loosened by vibration generated by the introduction of hydraulic oil into the hydraulic muffler 8. The nut member 15 is provided with a tension so as not to be disturbed.
[0009]
Reference numeral 20 denotes a return pipe which is returned from the single-acting hydraulic cylinder and returns the hydraulic oil controlled by the control valve 7 to the oil tank 1, is connected to the control valve 7, and is a cylindrical member from the flange member 12 at the upper end of the hydraulic muffler 8. 11, the bottom plate member 13 is sealed and penetrated, and one end of the opening is immersed in the working oil stored in the oil tank 1. The return pipe 20 penetrates the flange member 12 of the hydraulic muffler 8 at a position eccentric from the center between the connection position of the first supply / discharge pipe 9 and the connection position of the second supply / discharge pipe 10. And the bottom plate member 13 are fixed by welding. Reference numeral 21 denotes a substantially rectangular covering member that covers the oil tank 1, the electric motor 3, the hydraulic pump 5, the control valve 7, and the hydraulic muffler 8, and that is orthogonal to the side plates 1 </ b> A and 1 </ b> B of the oil tank 1. Side plates 1C and 1D are formed so as to protrude outward from the side plates 1A and 1B, and are provided to extend above the upper plate 2 so that the protruding ends of the side plates 1C and 1D are the same as the side plates 1C and 1D, respectively. Height side plates 21A and 21B are detachably fixed, and an upper opening surrounded by side plates 1C and 1D and side plates 21A and 21B is closed by an upper plate 21C. Further, gaps 22A and 22B are formed between the outer surfaces of the side plates 1A and 1B of the oil tank 1 and the inner surfaces of the side plates 21A and 21B of the cover member 21, respectively, and the inner surfaces of the side plates 21A and 21B are illustrated to fill the gaps 22A and 22B. Although not shown, a sound absorbing material made of a stretchable soft urethane foam having air permeability is provided by bonding.
[0010]
Next, the operation of this configuration will be described.
When the hydraulic pump 5 is driven to rotate by the electric motor 3, the hydraulic pump 5 sucks and discharges the working oil stored in the oil tank 1 from the suction pipe 6. Hydraulic oil discharged from the hydraulic pump 5 is controlled by the control valve 7, flows through the first supply / discharge pipe 9, reduces the pulsating flow by the hydraulic muffler 8, flows through the second supply / discharge pipe 10, is supplied to the single-acting hydraulic cylinder, and is housed. The hydraulic elevator is raised.
[0011]
Further, the hydraulic pump 5 is stopped, and the operating oil discharged from the single-acting hydraulic cylinder by the own weight of the residential hydraulic elevator flows through the second supply / discharge pipe 10, the pulsating flow is reduced by the hydraulic muffler 8, and the first supply The drain pipe 9 is flowed and controlled by the control valve 7 to flow through the return pipe 20 to flow back into the oil tank 1 to lower the residential hydraulic elevator.
[0012]
With this operation, the hydraulic muffler 8 generates vibration due to the pulsating flow of the hydraulic oil due to the introduction of the hydraulic oil, but this vibration is absorbed by the buffer member 14 and propagates to the upper plate 2 of the oil tank 1. Therefore, the resonance of the oil tank 1 is reduced, and the noise of the hydraulic unit can be reduced satisfactorily. Further, since the hydraulic muffler 8 is vertically attached to the upper plate 2 of the oil tank 1, the shearing force acting on the buffer member 14 can be reduced, and the durability of the buffer member 14 can be improved. The vibration generated by the operation of the electric motor 3 and the hydraulic pump 5 is absorbed by the buffer member 4 to reduce the propagation to the oil tank 1, and the operating noise is reduced by the oil tank 1 and the electric motor 3, the hydraulic pump 5, and the control valve 7. The sound is absorbed by the sound absorbing material provided so as to fill the gaps 22A and 22B and is further shielded by the cover member 21 that covers the hydraulic muffler 8, thereby further reducing noise. Further, since the hydraulic muffler 8 can be supported by the first supply / discharge pipe 9 and the return pipe 20 connected to the control valve 7, the load on the buffer member 14 of the hydraulic muffler 8 can be reduced, and the buffer member 14 is small. It can be handled with a shape. Furthermore, since the lower end of the hydraulic muffler 8 is immersed in the storage hydraulic oil of the oil tank 1, the pulsation of the hydraulic muffler 8 can be reduced by the resistance of the storage hydraulic oil, and the noise of the hydraulic unit can be further reduced. Can be.
[0013]
In the embodiment, the cushioning member 14 is constituted by the vibration isolating rubber 14A. However, the cushioning member 14 may be constituted by a spring member instead of the vibration isolating rubber 14A. Although a single buffer member may be formed in a ring shape to be inserted while leaving the flange member 12 of the above, and the electric motor 3 integrally connected with the hydraulic pump 5 is mounted on the upper plate 2 of the oil tank 1, Needless to say, the pump and the electric motor may be respectively mounted.
[0014]
【The invention's effect】
As described above, according to the present invention, an electric motor and a hydraulic pump rotationally driven by the electric motor and sucking and discharging the stored operating oil in the oil tank are mounted and provided on the oil tank storing the operating oil therein. provided by connecting the control valve or to reflux for controlling the hydraulic fluid discharged from the control hydraulic oil discharged is supplied to the external load or external load in an oil tank to supply the external load A hydraulic muffler configured to reduce a pulsating flow of hydraulic oil and hydraulic oil discharged from an external load is formed in a cylindrical shape, and is movably vertically attached to an upper plate of an oil tank via a buffer member . It is connected to and supported by a control valve by a supply / discharge pipe, and is connected to the control valve so that hydraulic oil controlled by the control valve is recirculated into the oil tank. Provide return pipe, return pipe seals hydraulic muffler Through provided, by fixing the pressure muffler return pipe is supported by the control valve, by the vibration of the hydraulic muffler is reduced to propagate to the oil tank, it is possible to achieve good noise reduction of hydraulic Yunitsuto, Further, the shearing force acting on the shock absorbing member that absorbs vibration can be reduced, and the durability of the shock absorbing member can be improved. Further, since the hydraulic muffler can be supported by the first supply / discharge pipe and the return pipe connected to the control valve, the load on the buffer member of the hydraulic muffler can be reduced, and the buffer member can be of a small shape.
[Brief description of the drawings]
FIG. 1 is a sectional view of a hydraulic unit according to an embodiment of the present invention, taken along a line BB in FIG. 2 with a side plate 1B removed.
FIG. 2 is a sectional view taken along line AA in FIG.
FIG. 3 is an enlarged sectional view taken along line CC of FIG. 2;
FIG. 4 is a longitudinal sectional view of a hydraulic unit showing a conventional example.
[Explanation of symbols]
1 oil tank 3 electric motor 5 hydraulic pump 7 control valve 8 hydraulic muffler 14 cushioning member

Claims (1)

An electric motor and a hydraulic pump rotating and driven by the electric motor to suction and discharge the stored hydraulic oil in the oil tank are mounted and provided on an oil tank storing the hydraulic oil therein, and the hydraulic pump controls the discharged hydraulic oil. It is discharged from the external load by controlling the hydraulic oil discharged from the supply or external load is provided by connecting the control valve or to reflux in an oil tank, hydraulic oil and the external load and supplies the external load by Hydraulic muffler that reduces the pulsating flow of hydraulic oil is formed in a cylindrical shape, and is movably vertically attached to the upper plate of the oil tank via a buffer member , and the hydraulic muffler is connected to the control valve by the first supply / discharge pipe. A return pipe connected to the control valve so that the hydraulic oil controlled by the control valve is recirculated into the oil tank, and one end of which is immersed in the stored hydraulic oil in the oil tank and arranged, and the return pipe is provided. A hydraulic muffler is provided through the seal Hydraulic Yunitsuto, characterized in that supported in the control valve by fixing the over to return pipe.

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