JPS62285883A - Fluid pressure elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a car driving system in which a car is driven directly or indirectly by a fluid pressure jack, and its speed is controlled by the speed of an electric motor. Related to fluid pressure elevators.

[Conventional technology]

A conventional hydraulic elevator of this kind has a hydraulic pump driven by an electric motor placed between a tank open to atmospheric pressure and a hydraulic jack, and the speed control of the first power is controlled by the rotational speed of the electric motor. Is going.

Incidentally, related examples of this type of fluid pressure elevator include, for example, Japanese Patent Application Laid-Open No. 59-203074.

[Problem that the invention seeks to solve]

The load weight of this hydraulic elevator is composed of not only the loaded weight of the passengers, but also the weight of the car, the plunger weight of the hydraulic jack, and the weight of the movable parts essential to constructing the hydraulic elevator.

All of these weights become load pressure, which becomes a load on the electric motor that drives the fluid pressure pump. For this reason, the driving power of the fluid pressure elevator becomes stronger, and the control device that drives the electric motor becomes larger and has a larger capacity, and the electric motor and the fluid pressure need to be larger and have a larger capacity, which is the biggest cause of high costs. There is. It is also a hindrance to the dissemination of this reminder.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluid pressure elevator in which costs can be reduced by downsizing and reducing the capacity of an electric motor that drives a fluid pressure pump.

[Means for solving problems]

In the present invention, a fluid pressure jack or an accumulator is used as a tank for storing fluid, and the internal pressure of this tank is approximately balanced with the internal pressure of the fluid pressure jack for driving the car, thereby operating a fluid pressure pump. The aim is to reduce the capacity of the electric motor to be driven, and thereby to reduce the size and capacity of the control device that drives the electric motor. This will reduce costs. [Operation] The internal pressure of the fluid pressure jack or accumulator as a tank according to the present invention is almost balanced with the internal pressure of the fluid pressure jack for driving the first power square.

Therefore, the pressure difference generated by the fluid pressure pump to raise and lower the car is only slightly larger than the one that accelerates the inertia of the moving parts, and this is significantly greater than the pressure required to support the weight of the moving parts. can be reduced to

〔Example〕

FIG. 1 is a diagram showing one embodiment of the present invention. In the figure, car 1 is connected to pulley 4. It is driven by the plunger 3 of the hydraulic jack 2 via the rope 5. A weight 11 is provided at the top of the plunger 10 of the other hydraulic jack 9. The fluid pressure jacks 9 and 2 are connected by a pipe 13 via a fluid pressure pump 7 and a switching valve 6. The fluid pressure pump 7 is a pump capable of forward and reverse rotation, and is driven by an electric motor 8 whose rotation speed is controlled by a control device 12.

Maximum loading load WLQ to passenger car 1, Wc of car own weight 1
, the dead weight of pulley 4 and flange 3 Wp, F.

Let the cross-sectional area of the plunger 3 be Ap. Further, the weight of the plunger 10 and the weight 11 is W, and the cross-sectional area of the plunger 10117 is A. W and A are determined as follows. Car 1's a-ri S c
+ Stroke of plunger 10 -tS.

S is As) Ap Sp ・・・・・・
......(2) is determined.

The operation of the hydraulic elevator according to the present invention is as follows.

When the load on the rider 1 is VvL, the internal pressure p2 of the fluid pressure jack 2 is as follows: 1) z=(2(*t,+Wc)+Wp)/Ap −
(3) Also, the internal pressure p9 of the fluid pressure jack 9 is: 9"J%'/'A=(Wp+2Wc+VvLo)/A
p-(4) When the elevator is ascending, the switching valve 6 is energized by the start command to fully communicate with the flow paths 13 and 13'', and the control device 12 causes the electric motor 8 to rotate forward, gradually increasing the rotation speed. As a result, the fluid pressure pump 7 sucks fluid at a pressure p from the fluid pressure jack 9, and supplies it to the fluid pressure jack 2 at a pressure slightly higher than the pressure p2.The plunger 3 of the fluid pressure jack 2 pushes up. and pulley 4.
Push up the car via the lobes 5. Fluid pressure pump 7
The flow rate of pressure oil flowing through the car, that is, the car speed is proportional to the rotation speed of the electric motor 8. Therefore, the car speed is controlled by motor rotation speed control, and acceleration, deceleration, stopping, etc. can be realized.

When the electric motor stops, the switching valve 6 is de-energized and the flow path 13 is
and 13". At this time, the rotation speed of the electric motor 8 is controlled by the control device 12 so as to be proportional to the speed of the motor 8.
Execute with.

When the elevator is descending, the switching valve 6 is energized by the start command and the flow paths 13 and 13'' are communicated with each other. Then, the control device 12 starts the electric motor 8 in reverse and gradually increases the rotation speed. n, the fluid pressure pump 7 sucks the pressure fluid 'f' at the pressure p2 from the fluid pressure jack 2, and supplies it to the fluid pressure jack 9 at a pressure slightly higher than the pressure p9.The plunger 3 of the fluid pressure jack 2 is a first-order cage Own weight, live load.

The planer descends due to its own weight, and the board and 1 also descend. This is the same as in the case of the monkey climb when the speed control of 1 and 1 is realized.

The work done by the fluid pressure pump 7 when driving the fluid pressure elevator 'ft is, when the flow rate is Q, Pp=(pz p
s)XQ...6) Dero! l) , (
3), (4), PP=(29%'[, WLo)XQ
/Ap...(6), b is proportional to the power PM of the motive power 8. Therefore, according to the present invention, as is clear from (6), the power of the electric motor is proportional to the difference between twice the live load and the maximum live load. it is,
Plunger weight of fluid pressure jack WP9 Car weight Wc
It is proportional to the maximum carrying load, regardless of the

Furthermore, when the rider 1 has a full stroke Sp, the flow of high pressure fluid into and out of the fluid pressure jack 2 is Vp=kpSp,
As is clear from (2), this is smaller than the fluid pressure jack 9. Therefore, leakage of fluid from this circuit can be tolerated to some extent, and its limit is (As-kp8p).

With the above configuration, in the conventional hydraulic elevator, the work of the driftwood pressure pump is P p =p! XQ=(2(vvL+Wc) +VVp
) X Q/Ap - (7) In the present invention, Pp
p) The power becomes smaller by XQ/Ap - (s). In a normal fluid pressure elevator, Wc≧W t,o, so in the fluid pressure elevator of the present invention,
It can be seen that the power required for the electric motor 8 is 1/4 or less. Therefore, the capacity of the control device is also proportional to that, 1/4
It can be made smaller as below. This is not only due to the miniaturization of the device, but also
This will dramatically improve economic efficiency.

[Other Examples]

FIG. 2 shows another embodiment of the invention. All the same symbols as in Fig. 1 are indicated. The difference from the embodiment shown in FIG. 1 is that an accumulator 15 is used instead of the fluid pressure jack 9, and the internal pressure of the accumulator 15 is approximately the same as ps, and the allowable inflow and outflow fluid fl'iAS is approximately the same. By doing so, the embodiment shown in FIG. 2 can obtain the same operation and effect as the embodiment shown in FIG. 1.

Further, another embodiment of the present invention is shown in FIG. Figures 1 and 2
The same symbol as in the figure indicates the same thing.

The difference from the embodiment shown in FIGS. 1 and 2 is that the hydraulic jack 2? It is made double, has a fluid pressure jack 2 on the inside, uses a gold accumulator 16 on the outside, and replaces it with a fluid pressure jack 9 and an accumulator V-tor 15. As in the embodiment shown in FIG. 2, the internal pressure of the accumulator 16 is approximately the same as p, and the allowable amount of fluid in and out is approximately As. Therefore, the effect is similar to the embodiment shown in FIGS. 1 and 2.

In addition, installation space can be saved, installation is facilitated, and the thickness of the ring of the hydraulic jack 2 can be reduced. This is because although the space does not increase as the outer diameter of the hydraulic jack 2 becomes slightly narrower, the installation space and work for the hydraulic jack 9 and the accumulator 15 are no longer required.

The cylinder of the fluid pressure jack 2 is the accumulator 16.
The pressure difference between the inside and outside is small.

〔Effect of the invention〕

According to the present invention, since the internal pressure of the tank is configured to be approximately equal to the internal pressure of the fluid pressure jack for driving the car, it is possible to increase the capacity of the electric motor that drives the fluid pressure pump. Cost reduction can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a fluid pressure elevator according to the present invention. FIG. 2 is a block diagram showing another embodiment of the present invention, and FIG. 3 is a block diagram showing still another embodiment of the present invention.

Claims (1)

[Claims] 1. A fluid pressure elevator of the type that is composed of a car, a hydraulic jack, a hydraulic pump, an electric motor, and a control device, and in which the speed of the car is controlled by controlling the rotational speed of the electric motor,
A fluid pressure elevator characterized in that a fluid pressure pump capable of forward and reverse rotation and a switching valve are arranged in the middle of a flow path that connects a tank that can be pressurized in advance and a fluid pressure jack that drives a car. 2. A fluid pressure elevator according to claim 1, characterized in that another fluid pressure jack is used as the tank to which pressure is applied in advance. 3. A fluid pressure elevator according to claim 1, characterized in that an accumulator is used as the tank to which pressure is applied in advance.