JPS62264185A - Hydraulic jack for hydraulic 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 [Field of Industrial Application] The present invention relates to a hydraulic jack used in a hydraulic elevator, and more particularly to a hydraulic jack that prevents the stick-slip phenomenon from occurring.

[Conventional technology]

FIG. 2 is an overall configuration diagram showing an outline of a conventionally commonly used hydraulic elevator. In the figure, 1 is a hydraulic power unit that discharges pressurized hydraulic oil and collects return oil;
Reference numeral 2 denotes a hydraulic muffler connected in series to the hydraulic power unit 1, and a filter provided inside the muffler collects dust contained in the returned oil. 3 is a valve connected in series to the hydraulic muffler 2; 4 is a hydraulic jack provided at the bottom of the hoistway; and 6 is a hydraulic jack that connects the hydraulic power unit 1 and the hydraulic jack 4 via the hydraulic muffler 2 and pulp 3. Hydraulic piping 7 is a car that is moved up and down in the hoistway 5 by a hydraulic jack 4.

Figure 3 shows the configuration of the hydraulic jack 4 shown in Figure 2.
8.9 is a cylinder and plunger that constitute the hydraulic jack 4. A first gasket 10 seals between the plunger 9 and the cylinder 8, and is housed in a housing 11. 12
is a second gasket provided on the top of the first gasket 10, and is housed inside the housing 13. 14
is the first. A gland metal 15 is provided between the second gaskets 10 and 12 to support the plunger 9, and is a drain vibe for draining oil leaking from the first gasket 10.

In the hydraulic jack for a hydraulic elevator configured in this manner, when the hydraulic power unit 1 is driven in accordance with an instruction from an elevator control circuit (not shown), pressurized hydraulic oil is discharged. After passing through the hydraulic muffler 2 and the valve 3, this pressurized hydraulic oil is supplied to the hydraulic jack 4 via the hydraulic pipe 6. When the hydraulic jack 4 is supplied with pressurized hydraulic oil, the plunger 9 shown in FIG.
will be highlighted. Here, since the upper end portion of the plunger 9 is connected to the car 7, the car 7 rises in the hoistway 5 as the plunger 9 protrudes.

Next, when a switching valve (not shown) provided inside the hydraulic power unit 1 is switched according to an instruction from an elevator control circuit (not shown), the internal working oil in the cylinder 8 in the hydraulic jack 4 is changed to 1, and the hydraulic oil in the hydraulic pipe 6 is changed to 1. It is returned to the oil tank provided in the hydraulic power unit 1 via the valve 3 and the hydraulic muffler 2. As a result, the plunger 9 in the hydraulic jack 4 contracts, and the car 7 descends inside the hoistway 5.

Here, the car moves up and down in response to the rise and fall of the plunger 9 in the hydraulic jack 4. When the plunger 9 moves up and down, the first and second gaskets 10
．． 12 is in strong contact with the circumferential surface of the plunger 9, thereby preventing the hydraulic oil in the cylinder 8 from leaking to the outside. A certain amount of hydraulic oil leaking through the first packing 10 is supplied to a drain tank (not shown) through a drain pipe 15. Moreover, in this case, the first. Since the second packings 10 and 12 are of the same size, the diameter A of the housing 11 that accommodates them is the diameter A of the housing 13.
It is equal to 2.

[Problem that the invention seeks to solve]

Since the conventional hydraulic jack for a hydraulic elevator is configured as described above, most of the hydraulic pressure is sealed by the first packing. As a result, no pressure is applied to the second seal, so the pressure is close to atmospheric pressure, and as a result, the force of the second seal gripping the plunger is strong, causing a so-called stick-slip phenomenon. There was a problem in that the heel of the vehicle moved slightly up and down, which significantly impeded the ride comfort.

This invention was made to solve the above-mentioned problems, and an object thereof is to provide a hydraulic jack for a hydraulic elevator that can prevent the stick-slip phenomenon caused by the packing. .

[Means for solving problems]

The hydraulic jack for a hydraulic elevator according to the present invention has a diameter of a housing that accommodates a plurality of gaskets each serving as a sealing member that surrounds a plunger and prevents the leakage of hydraulic oil. It is something that makes things different.

[Effect]

In a hydraulic jack for a hydraulic elevator constructed in this way, when the diameter of the housing is increased, the force exerted in the centripetal direction on the packing housed inside the housing decreases, so that the packing in this area as a whole is The force required to tighten and attach the plunger is reduced, and the stick-slip phenomenon caused by the seal is prevented, resulting in a hydraulic elevator with good riding comfort.

C Embodiment of the Invention] Hereinafter, an embodiment of the invention will be described with reference to the drawings. 1st
The figure is a sectional view of the main part of the head part of the hydraulic jack for a hydraulic elevator according to the present invention, and the same parts as in FIG. 3 are indicated using the same symbols. In the figure, 16 is a housing that accommodates the second packing 12, and its diameter A3 is set larger than the diameter A1 of the housing 11 that accommodates the first packing 10. The difference from FIG. 3 is that the diameter of this housing 16 is made larger than the diameter of the housing 11.

In the hydraulic jack for a hydraulic elevator configured in this way, when pressurized hydraulic oil is supplied to the inside of the cylinder 8, the plunger 9 is projected and the corner of the elevator is raised. Further, when the hydraulic oil in the cylinder 8 is returned to the oil tank, the plunger 9 is housed in the cylinder 8 and the corner of the seat is lowered.

Here, the pressurized hydraulic oil supplied into the cylinder 8 is prevented from leaking by the first packing 10. On the other hand, the second packing 12 is the first packing 1.
Due to the almost complete sealing effect of 0, almost no pressure is applied to the pressurized hydraulic oil, so the pressure is almost at atmospheric pressure. The force will increase. However, the diameter A of the housing 16 that accommodates the second packing 12 is the same as that of the first packing 12.
Since the diameter is set larger than the diameter of the housing 11 that accommodates the second gasket 12, the force of pressing the second gasket 12 in the centripetal direction is weakened, and the force of tightening the second gasket 12 against the plunger 9 is also weakened. Become. As a result, the stick-slip phenomenon caused by the second seal 12 is prevented from occurring.

In the above embodiment, a case has been described in which the diameter of the housing 16 that accommodates the second packing 12 is set to be larger than that of the housing 11 that collects the first packing 10. If this causes a stick-slip phenomenon, the diameter of the housing 11 may be made larger than the diameter of the housing 16.

(Effects of the Invention) As explained above, the hydraulic jack for a hydraulic elevator according to the present invention has a plurality of screws arranged to tighten around the plunger in order to prevent hydraulic oil from leaking around the plunger. Since the diameter of the housing that accommodates each seal is changed and the tightening force of the seal is varied, the stick-slip phenomenon is prevented and a hydraulic elevator with good riding comfort is obtained. effective.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts showing an embodiment of a hydraulic jack for a hydraulic elevator according to the present invention, FIG. 2 is an overall configuration diagram showing a conventional hydraulic elevator, and FIG. 3 is a main part of the hydraulic jack shown in FIG. 2. FIG. 4 is a hydraulic jack, 8 is a cylinder, 9 is a plunger, 10 is a first gasket, 11.16 is a housing, 12
is the second patch skin, and 15 is the drain vibe. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (2)

[Claims] (1) In a hydraulic elevator jack that is driven by the output oil of a hydraulic power unit to raise and lower an elevator car, a plurality of hydraulic jacks are installed to tighten around the plunger to prevent hydraulic oil leakage. A hydraulic jack for a hydraulic elevator, characterized in that the diameters of the housings that accommodate the respective packings are different. (2) The hydraulic jack for a hydraulic elevator according to claim 1, wherein each housing has a diameter larger than that of the innermost housing.