JP2002179362A - Power unit of hydraulic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises from a power unit of a hydraulic elevator. SOLUTION: A hydraulic pump 5, a motor 6 and a main control valve 8 are immersingly arranged in hydraulic fluid 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit for a hydraulic elevator in which a hydraulic pump, an electric motor and the like are housed in an oil tank.

[0002]

2. Description of the Related Art Recently, in an apartment house, an elevator machine room is unavoidably installed adjacent to a living room in order to effectively use land. For this reason, there is an increasing demand for quietness of elevators. In order to reduce the noise in the machine room, it has been considered to cover the entire power unit with a cover. However, it is difficult to completely seal the power unit, the noise reduction effect is small, and the cooling efficiency of the motor is deteriorated. There is a problem.

Therefore, as another method, a so-called submerged type in which a hydraulic pump and an electric motor, which are main noise sources, are immersed in hydraulic oil in an oil tank has been frequently used. This configuration will be described with reference to FIG. In the figure, 1 is an oil tank, 2 is a tank stand, 3 is a cover of the oil tank 1, 4 is hydraulic oil stored in the oil tank 1, 5 is a hydraulic pump driven by an electric motor 6, It is immersed in the hydraulic oil 4 together with the electric motor 6 by a mounting bracket 7 fixed to the inner surface. Reference numeral 8 denotes a main control valve arranged above the lid 3, which is connected to a hydraulic jack (not shown) and the hydraulic pump 5 by a pipe 9. 10 is a return pipe.

[0004]

According to the prior art, in the case of a valve-controlled elevator, the speed control is performed by narrowing the opening of the main control valve 8 during the descending operation, so that the noise from the main control valve 8 is large. There is a problem. On the other hand, in the case of the system in which the electric motor 6 is controlled by the inverter, although the quietness is excellent in the normal operation, when the temperature of the hydraulic oil 4 decreases, the hydraulic oil 4
When performing the temperature raising operation for raising the oil temperature by performing the reflux operation, the noise generated from the main control valve 8 is large. Furthermore, since the heating operation is most often performed during the night when the elevator is stopped for a long time, there is a problem that a noise problem is likely to become apparent.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a power unit for a submerged type hydraulic elevator, in which, similarly to a hydraulic pump or an electric motor, a main control valve is immersed in hydraulic oil to reduce noise and reduce the size of the power unit. It is to realize the conversion.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In the present embodiment, the main control valve 8 is arranged so as to be immersed in the hydraulic oil 4 like the hydraulic pump 5 and the electric motor 6, and the same reference numerals as those in FIG.

[0007] According to this embodiment, the noise during the heating operation can be reduced. Also, the return pipe 9 from the main control valve 8 to the oil tank 1 can be omitted or shortened, and the power unit can be reduced in size.

[0008]

As described above, according to the present invention,
Noise from the power unit of the hydraulic elevator can be reduced, and the power unit can be further downsized.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram schematically illustrating a power unit of a conventional hydraulic elevator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil tank 4 Hydraulic oil 5 Hydraulic pump 6 Electric motor 8 Main control valve

Claims (1)

[Claims] 1. A power unit for a hydraulic elevator, wherein a hydraulic pump, an electric motor, and a main control valve are immersed in hydraulic oil stored in an oil tank.