JPS6098205A - Hydraulic device for elevator - Google Patents

Abstract

PURPOSE:To enable saving of a space and reduction of a cost, by a method wherein a plurality of hydraulic pipings join each other through a silencer. CONSTITUTION:A plurality of hydraulic pipings 26 join each other through a silencer 31. This causes the silencer 31 to additionally exhibit the function of a combined pipe, eliminates installation of a combined pipe, and enables saving of a space and reducation of a cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hydraulic system for an elevator, and more particularly to a hydraulic system in which a plurality of power units are used for seven hydraulic elevators.

[Technical background of the invention and its problems]

Hydraulic elevators used include indirect hydraulic elevators that lift nine-seater cars using ropes, sheaves, etc., and direct hydraulic elevators that have hydraulic jacks placed directly below the seats and lift and lower the jacks. .

FIG. 1 is a schematic diagram showing a lifting device of a direct hydraulic elevator. In the figure, the symbol // is a power train, and the car L/ is operated by a hydraulic cylinder consisting of a hydraulic cylinder /2 and a cylinder 13 located directly below the hoistway 15.
It is designed to be moved up and down inside. In the figure, reference numerals /6 and /7 indicate guide rails that guide the vertical movement of the car.

and a guiding device. Machine adjacent to hoistway 15 ♀/
A power unit 5 consisting of an oil tank Yuba electric motor U, a hydraulic cylinder f23, a flow rate/control valve J, etc. is disposed within this engine room 1g. Power unit Yu S
Is the pressure oil generated by hydraulic pressure distribution? The oil is supplied to the hydraulic jack lq via the bellow J, but in order to prevent troubles such as vibration and noise caused by the pulsation of the hydraulic pump force, a silencer 27 is normally placed in the hydraulic piping J to prevent the pulsation of the supplied oil. This is to completely attenuate it.

By the way, hydraulic elevators for large loads and automobiles use large hydraulic jacks and therefore require a large amount of pressure oil, and a plurality of power units may be connected to supply the entire pressure oil.

Figure 2 shows two power units 5″?: connected and 1
It is a figure which shows the example which supplied the pressure oil to the hydraulic jack /l of the stand. In other words, the hydraulic parts M-26 connected to each power unit 5 are merged by the merging pipe 2g, and then the merging pipe 2g is connected to the silencer 27. 2
7 is a partially enlarged cross-sectional view showing a connection state with 7. FIG.

By using such a merging pipe to join multiple hydraulic pipes together,
The conventional circuit configuration in which this merging pipe is connected to a silencer has the following drawbacks.

(B) In order to reduce the flow velocity in the pipe (usually less than m/sec), the diameter of the merging pipe 2.g needs to be changed between the pre-merging part and the post-merging part, as shown in Figure 3. υ, difficult to manufacture and expensive.

(Rono) Separate space is required for each row to install the merging pipe and 2gf, and the machine room/g becomes larger accordingly.

[Purpose of the invention]

The present invention has been made with these points in mind, and an object of the present invention is to provide a hydraulic system M for an elevator that does not require the installation of a merging pipe and can save space and reduce costs. shall be.

[Shelf of inventions, essential]

The present invention is an elevator hydraulic system in which a plurality of power units are connected to seven hydraulic elevators via hydraulic piping, and is characterized in that the plurality of hydraulic pipings are joined by a silencer.

According to the present invention, the silencer can also serve as a merging pipe, making it unnecessary to install a merging pipe.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

Figure 5 is a schematic diagram showing an embodiment of an elevator hydraulic system according to the present invention. Hydraulic piping 2.6 is connected to each of the two power units J, and the other ends of the hydraulic piping 6 are connected to both ends of the silencer 3/ to join together. FIG. 5 is a sectional view showing the connection state of the hydraulic piping and the silencer 3/. Silencer 31
is a cylindrical body having a capacity fAk sufficiently large for the flow rate of pressure oil, and is composed of a cylindrical casing 33 and a flange 3t that completely seals both ends of the cylindrical casing 33. 7. The pressure pipe 26 is connected to both end flanges 3IA of the suppressor 3/
The silencer 3/
The outlet arrangement 3.2 from is connected to the central part of the cylindrical casing 33. The outlet pipe 32 is further connected to a hydraulic jack for supplying the pressure oil necessary for raising and lowering the passenger car.

Next, the operation of this embodiment having such a configuration will be explained.

The pressure oil discharged from one power unit Δ passes through the hydraulic piping and flows from both ends of the silencer 3/ to the silencer 3/.
Join inside. The pressure oil merged within the silencer 3/ is transferred to the outlet pipe 3-1. The entire flow is fed to the hydraulic cylinder lφ.

Since the silencer 3/ has a sufficiently large volume relative to the pressure oil flow rate, the pulsation of the pressure oil from the power unit J is released within the silencer 3/.

What is the difference between the silencer in the present embodiment ψ゛1 and the silencer in the conventional example shown in FIG.
Let's compare. Section 6 1 shows the shape and dimensions of a conventional silencer, and FIG. 7 shows the shape and dimensions of the silencer according to this embodiment. In the case of the shapes and dimensions as shown in FIGS. 6 and 7, the silence effect fan as a single unit is expressed by the following formula.

For conventional silencer -2010g1 cos klcl --...t/J
In the case of Xylencer in this example, C: Speed of sound (Example: 1000H2) f: Pulsation frequency (Example: 100H2) Comparing the above formula (1) and the first formula, the difference between the two is There is only 7 terms.Generally, due to the structure, IC<12
/'2 is often used, but in a practical size range, a larger value of 1° is more effective.

For example, 1o=0. / When m: lO': Log, l cos k1cl=-:1
01oglc101o, lJ'xO0/)l:0.0
/7 1c”Ex/2=0.II evening time -201og, 1cosklc 1=-201og!
coe(0, r<2xo, +tl=0.3!

Therefore, the silencer according to this embodiment is different from the silencer according to the conventional example! The silencing effect is superior by the difference in the lllth term.

FIG. 2 is a sectional view showing another embodiment of the present invention. In this embodiment, the silencer /A/ has a vertical structure,
Pressure oil that has flowed in from the lower flllU is discharged from the upper side. In such a silencer t/, the hydraulic piping 26 from the two power units is
They are inserted and connected to the lower side of the silencer IA/ so as to face each other, and the outlet pipe ψ is connected to the upper side of the silencer salmon/.

The silencer having such a structure can also function as a merging pipe for multiple hydraulic pipes, and also exhibits a good muffling effect, as in the above-described embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to eliminate the need for installing a merging pipe, save space, and reduce costs.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the lifting device of a hydraulic elevator, a
), Fig. 2 is a hydraulic circuit diagram showing a conventional elevator hydraulic system, Fig. 3 is a sectional view showing a connection state between a conventional silencer and a merging pipe, and Fig. 2 shows an elevator hydraulic system k according to the present invention. Hydraulic circuit diagram, FIG. 5 is a sectional view showing the connection state between the silencer and hydraulic piping according to the present invention, FIG. 6 is a schematic diagram showing the shape and dimensions of a conventional silencer, and FIG. 7 is the shape and dimensions of the silencer according to the present invention. FIG. 2 is a sectional view showing another embodiment of the invention. l/...car, /9...hydraulic jack, J...
Power unit, 2.6...hydraulic piping, 3/...silencer, 3...self-pipe, ke/...silencer. Applicant's representative: Inomata Wei Figure 1 6 Figure 2 Figure 4 Figure 5 Figure 3 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] / An elevator hydraulic system in which a plurality of power units are connected to seven hydraulic elevators via hydraulic piping, characterized in that the plurality of hydraulic pipings are joined by a silencer. Hydraulic system for elevators. 2. Claim 1, characterized in that the silencer is a cylindrical body having a volume sufficiently large for the flow rate of pressure oil.
Hydraulic system for elevators as described in . 3. The hydraulic system for an elevator as set forth in claim 1, wherein the hydraulic piping is connected to both side surfaces of the silencer so as to face each other.