JPS59212504A - Hydraulic apparatus for hydraulic elevator - Google Patents

Abstract

PURPOSE:To suppress the amount of sinking due to the compression of air and oil by installing, in the hollow part of a plunger, a filling-up member having a passage for introducing the pressurized oil into the upper part of the plunger, and forming an air vent in the upper part of the plunger. CONSTITUTION:In the hollow part of a plunger 4A, a hole 13 for introducing pressurized oil into the upper part of the plunger 4A, and a filling-up member 17 having a conical concaved part 20 are installed, and an air vent 19 is formed in the upper part of the plunger 4A. Therefore, air can be discharged-out perfectly, and the amount of oil which intrudes into the plunger 4A can be reduced. Thus, the amount of sinking due to the compression of air and oil can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hydraulic jack for a hydraulic elevator.

[Technical background and problems]

Hydraulic elevators generally have a (quadratic) structure. In other words, as shown in Fig.
Pressure oil flows into and out of the hydraulic jack 3 through the plunger 4, which moves the car 5 up and down along the guide rail 6.

Considering the strength of the plano plunger 40 of a hydraulic elevator in this way, in Fig. 1, let the pressure of the pressure oil 7 be P, and as shown in the figure, let the receiving surface of the plunger 4 be A, then the pressure oil The pushing up force due to this is P・person. This pushing up force causes the heel 5 to rise against the weight W, which is the sum of the car 5 and the cargo 8. Therefore, the compressive force W is applied to the plunger 4 (2). Therefore, if the length L of the plunger 4 increases, there is a risk of buckling.

Here, since the plunger 1 is generally a hollow tube, the outer diameter of the plunger 4 is set as Dl, and the limit load PB at which the plunger 4 buckles is: From Euler's equation for a long column, -) When 100, the quadratic radius of section is: K=,/Fixed body e1 of the mouth arch salivary column. : n Pi: π Young's modulus: E General (2. In an elevator plunger, both ends are considered to be rotating ends, and n = 1, so it becomes.

In other words, the buckling limit load PR decreases in proportion to the square of the length L of the plunger 4. This means that as the lift height of the elevator increases, the buckling limit of the plunger 4 approaches the limit (2). In other words, the length of the plunger 4 of a hydraulic elevator cannot be made too long because it will buckle. In other words, there is a limit to the lift height of the elevator. If the moment ■ is increased, the buckling limit load will increase,
Although the head of the elevator can be increased, in order to increase (2), the outer diameter of the plunger 4 must be increased and the inner diameter must be decreased. As a result, the thickness and weight of the plunger 4 increase, the required driving power increases, and the cost also increases.

For this reason, the hydraulic pressure L/Beta, which is currently used to directly push up the car, has a hydraulic pressure of 15 to 2
This is because 0m is the limit. In other words, this means that the use of hydraulic elevators is limited to about 5 to 6 floors in a building.

On the other hand, the height of buildings has increased rapidly in recent years, with most buildings exceeding 10 stories (especially in Futabe).

In such a tall building (a), even if it is disadvantageous in terms of security, an elevator machine room installed at the top of the building (= an elevator using a hoisting machine driven by an electric motor and a hanging rope is used. Compared to hydraulic systems, this system requires a machine room at the top of the building, and sunlight rights are often a problem (-1
It has disadvantages such as heavy economic burden, long installation period, and complicated maintenance.

For this reason, it is desired that hydraulic elevators be installed in buildings C2 that are 1% taller than 10th floor. Furthermore, for hydraulic elevators used in low-cost buildings, it is expected that by reducing the diameter of the conventionally used plunger and, by extension, the diameter of the cylinder 9, it will be possible to make the hoistway smaller and reduce costs. ing.

For the above-mentioned reasons, compared to the conventional one, the diameter of the plunger and cylinder 9 remains the same, but the piston is higher, or conversely, if the lift height is the same, the plunger 4,
This is why there is a strong demand for a hydraulic elevator in which the diameter of the cylinder 9 can be reduced.

Therefore, in the past, in order to meet the above request, the following was considered. I8 will be explained based on FIG. 2. In the figure, 1o is the lower end of the plunger 4.
, is a through hole in the boundary plate 11 through which the pressure oil 7 can flow into the plunger 4. With this structure, the pressure P acts on the upper end 12 of the plunger, and the total pressure P・Δ1 and the force P acting through the outer shell of the plunger 4
-a balances with the weight jd W of the heel 5, etc. Therefore, the force that contributes to the buckling of the plunger 40 is p-1, which is very small compared to I' and A. You can increase the length of the plunger by doing something like this.

General (the sword that contributes to double buckling is about 15~]/1o, and.

The plunger length can last 2-3 times (-).

Now, next (2 baskets 5 (2 baskets 5)
Describe the amount of subsidence.

In general, the person who sinks in car 5 is δ. δ work δ, 10 δ2 + δ.

Here, δI: anti-vibration rubber resistance Sinking due to hydraulic oil pressure in the δ2 Niji ring δ,: within the arrangement “C” It is.

These ratios are approximately δ1:δ, :δs””2
+ 7:l, which accounts for most of the sinkage of the cargo.

This is due to the compression of the oil in the cylinder 9.

The sinking amount δ2 of the cylinder 5 due to the compression of the oil in the cylinder 9 can be expressed in Table 4 using the following equation. In other words, here, V is the volume of oil in the cylinder β, the compression ratio of the oil.However, when using the plunger 4 with oil in it (2), the value of ■ is the volume of oil in the cylinder 9 and the plunger 4
It is the sum of the volume of oil inside.

For example, if the inner diameter of the cylinder 9 is 190φ and the inner diameter of the plunger 4 is 130φ, the ratio of the oil iV in the cylinder 9 to the oil tVp in the plunger 4 is Vp/V = (130/190) 0.5 Therefore, When plunger 4 (2) is filled with oil, the amount of sinking of plunger 5 due to the load increases by about 40% compared to when it is not filled, which has been considered a problem.

Therefore, as shown in Figure 3 (2), the plunger 4 is made of synthetic resin, light alloy, etc., has a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the plunger 4, and has a small cylinder in which pressure oil 7 flows through the center. The present applicant has applied for a technique in which a cylindrical member 15 with a counterbore portion 14 at the top is installed to reduce the amount of sinking of the car 5 due to cargo.
There was a problem in that air remained in the counterbore part 14 between the upper part 16 of the plunger 4 and the cylindrical member 15, and air could not be vented. In other words, even if the air is removed, the remaining air is compressed and adds to the amount of sinking of the car 5.

[Purpose of the invention]

The present invention solves the above-mentioned drawbacks of the prior art and completely eliminates the residual air in the plunger, reducing the amount of sinking in the car.
Each episode offers a hydraulic jack that you get.

[Summary of the invention]

In order to accommodate buildings with higher floors, the present invention provides a through hole in the end plate of the plunger, feeds pressure oil into the plunger, applies a lifting force at the upper end, and reduces the load on the plunger (two square corners). This is to compensate for the limit of the slenderness ratio due to the increase in length, but while the plunger is
If two-pressure oil enters, the corresponding amount of compression - C: sinking and sinking,
Inside the plunger (-If air remains, it will appear as a similar compressed sink amount and have an adverse effect, so in the present invention, the content, such as the cylindrical part side, which reduces the amount of oil entering the plunger.) 1) When paulownia is inserted into the plunger section (2) the air is completely removed (2) by removing the air, the lift of the plunger is obtained as before, and the oil pressure 2. This eliminates the amount of sinking.

[Practice of the Invention] The details of the present invention will be explained below with reference to the drawings.

As shown in FIG.
7 and after inserting this cylindrical member 17, the end plate 11 is fixed by welding or a fastener (screw member, etc.).

Upper part to plunge 4 (second is air chamber 18 and air vent 19
will be provided. However, the air vent 19 is not limited to the upper part.

The air vent I9 has a female threaded part into which the J2 body 2 is screwed, a hole in the sea that is tapered and communicates with the air chamber 18, and a hole between the upper 1j self-screw 21 and the tapered part (two balls). 22 is interposed, and the screw body 21 moves forward and backward (the second ball 22 moves the valve).

5 and 6 show the structure of the cylindrical member 17, such as the shape, which is made of nylon, polyethylene, fluorine resin, aluminum alloy, etc., and has excellent oil resistance and strength. has a cylindrical shape slightly smaller than the inner diameter of the plunger 4, and a cylindrical member 1 is installed in the center so that the differential oil 7 flows.
A hole 13 with an outer diameter of 7 (more than 2) is drilled, and a conical four-part hole is provided at the bottom.

Next, we will discuss the buckling of the plunger 4 in the case of the structure shown here.As shown in Fig. 4, the pressure P acts on the upper end of the plunger 4, and the total pressure P, A, and the force p-a that acts through the outer shell of the plunger 4, that is, the wall thickness, balances the weight W of the car 5 etc. (2). Therefore, the buckling of the plunger 4 (2) The force contributing to Since p-a and p-a are much smaller than P and A as mentioned above, the plunger can be taken large.

In addition, the force exerted on the cargo due to the compression of the oil in the cylinder 9) and 5
Regarding the sinking amount, since the internal volume of the plunger 4 (2), the volume of the hole 13 of the cylindrical member 17, the conical recess of the air chamber 18, etc. is very small, so when inserting the circular member 17 into the plunger 4 In this case, the amount of sinking of the car due to the cargo is approximately the same as in the case where no pressure oil is put into the plunger 4.

Next (Second), let's talk about venting the air inside the plunger 4.

When pressure oil 7 is put into cylinder 9 as shown in Fig. 4,
The pressure oil 7 is supplied to the conical recess side of the cylindrical member 17 in the plunger 4 and the hole 13 from the through hole 10 made in the end plate Ill.
Gradually (two people enter the conical recess side and hole 1 at the same time)
The air in 3 moves upwards. The fourth part 2o is conical and ℃
Therefore, the air in the four parts 20f does not stay there, but all moves upward. Sufficient pressure oil 7 is inside the plunger 4 (-
When the air enters the air chamber 18 at the top of the plunger 4, operate the air vent 19 (loosening the screw body 2) and the oil pressure P (the second ball 22 floats and the air is vented)
(Secondly, all the air can be led out of the plunger 4 and all the remaining air can be discharged.

As described above, according to the present invention, the plunger 4
By reducing the force that contributes to buckling of the plunger 4, the length of the plunger 4 can be increased.

In addition to being able to reduce the amount of sinking of the cylinder 5 due to oil compression, there is a remarkable effect that the air inside the plunger 4 can be completely removed.

[Brief explanation of the drawing]

Figure 1 is an approximate diagram of a hydraulic elevator, Figure 2 and 83
Figure 4 is an explanatory diagram of a conventional hydraulic jack; Figure 4 is a sectional view of a hydraulic jack according to an embodiment of the invention; Figures 5 and 6 are a vertical sectional view and a bottom view of the cylindrical member shown in Figure 4. It is. 4... Plunger 7... Pressure oil 9... Cylinder 10... Calm hole 11... End plate
13... Hole 17... Cylindrical member 18...
Air chamber 19... Air handling... Conical recess (7317) Representative Patent attorney Kensuke Norichika (and 1 other person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A hollow plunger and an end plate (
A hydraulic jack is provided with a through hole through which dual-pressure oil flows to obtain lift at the upper part of the plunger. A hydraulic system for a hydraulic elevator, characterized in that a filling member having a guiding path is interposed therebetween, and the plunger is provided with an air vent.