JPH0842501A - Hydraulic power unit - Google Patents

Abstract

PURPOSE:To provide a hydraulic power unit which can carry out oil sealing work between a hydraulic tank and a hydraulic circuit jointed to the hydraulic tank suitably, and facilitate maintenance and inspection for unit part device such as a hydraulic oil pump and a control valve. CONSTITUTION:This power unit is provided with a case 10 which seals a suction pipe 5 and a return pipe 8, and a pump 12 which discharges oil in the case 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic power unit that suitably performs oil sealing work between an oil tank and a hydraulic circuit connected to the oil tank.

[0002]

2. Description of the Related Art Generally, a hydraulic power unit is configured by arranging equipment such as a hydraulic oil pump driven by an electric motor and a control valve, and an oil tank near the upper part of these equipment. A suction pipe and a return pipe connected to the device are connected to the bottom of the oil tank to open inside, and a strainer is provided at the opening of the suction pipe. For the hydraulic power unit with the above configuration, when disassembling the equipment for maintenance and inspection, either drain the hydraulic oil from the oil tank to another container, or put your hand in the oil tank and remove the strainer to remove the cap. It was disassembled after closing the openings of the suction pipe and the return pipe with. In addition, a special room is formed at the opening of the suction pipe to cover the strainer, and the opening to the oil tank in this room is opened and closed to block or release the flow of hydraulic oil to the suction pipe. As
Japanese Utility Model Publication No. 52-157513 can be cited.

[0003]

However, in the case where the above-mentioned prior art is once discharged to another container, a separate device for transferring oil is required, and when the opening is closed with a cap, the work is required. There was a problem that the worker's hands became dirty and work efficiency deteriorated. Also, in the structure of the prior art described below, there is a problem that the structure around the opening of the suction pipe becomes complicated and the suction pipe must be attached and detached when the strainer is attached and detached.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a hydraulic power unit that facilitates maintenance and inspection of equipment such as hydraulic oil pumps and control valves.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a hydraulic oil pump for sucking hydraulic oil from an oil tank of a hydraulic elevator through a suction pipe, and a control valve for sending the hydraulic oil into the oil tank through a return pipe. And a case for sealing the suction pipe and the return pipe, and a pump for discharging the oil in the case.

[0006]

Since the present invention is configured as described above, it is possible to remove the oil around the openings of the suction pipe and the return pipe.
Therefore, the flow of hydraulic oil from the oil tank to the suction pipe and the return pipe can be stopped.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is an overall configuration diagram of a power unit using the present invention.

Reference numeral 1 denotes a hydraulic oil pump that discharges hydraulic oil 3 in an oil tank 2 through a strainer 4, a suction pipe 5 and a pipe 6 to a hydraulic cylinder (not shown) through a suction control valve 7 to raise an elevator. A control valve 7 opens when the elevator descends, and discharges the oil from the hydraulic cylinder into the oil tank 2 through the return pipe 8. Reference numeral 9 is a unit portion composed of the hydraulic oil pump 1 and the control valve 7.

Next, the operation of the oil sealing operation using the present invention will be described.

First, the case 10 is brought into close contact with the bottom of the oil tank 2 so as to cover the suction pipe 5 and the return pipe 8. An elastic body 11 is coupled to a portion of the case 10 that is in close contact with the oil tank. The elastic body may be rubber, for example. Then, the discharge pump 12 sucks the oil between the case 10 and the oil tank 2 and discharges it from the discharge port 13. By operating in this way, according to the present embodiment, the case 1
Since there is no oil between 0 and the oil tank 2, the suction pipe 5 and the return pipe 8 can be sealed.

[0012]

Since the present invention is configured as described above, the flow of oil from the oil tank to the suction pipe and the return pipe can be completely stopped. Therefore, the unit device including a hydraulic oil pump, a control valve, etc. Maintenance and inspection can be performed easily.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a power unit using the present invention.

[Explanation of symbols]

 1 Hydraulic Oil Pump 2 Oil Tank 3 Hydraulic Oil 5 Suction Pipe 7 Control Valve 8 Return Pipe 10 Case 12 Discharge Pump

Claims (1)

[Claims] 1. A hydraulic power unit comprising a hydraulic oil pump for sucking hydraulic oil from an oil tank of a hydraulic elevator via a suction pipe, and a control valve for sending the hydraulic oil into the oil tank via a return pipe, A hydraulic power unit comprising a case for sealing the suction pipe and the return pipe, and a pump for discharging oil in the case.