JPS5919702A - Pressure boosting type dash pot of accumulator - Google Patents

Abstract

PURPOSE:To prevent a rapid closing of a poppet valve caused by a dynamic pressure by a method wherein liquid is filled in a liquid chamber in a bearing cylinder. CONSTITUTION:When a poppet valve 5 is opened, a large diameter upper part (c) of a valve shaft 6 is positioned above a liquid chamber 11 at a bearing cylinder 8 and liquid is immersed from a sliding clearance between the valve shaft 6 and the bearing cylinder 8 and filled in the liquid chamber 11. When the liquid in the main body 1 of a container is discharged from a supplying and discharging port 4 at a speed more than 25m/sec, the poppet valve 5 is rapidly closed. However, the liquid filled in the liquid chamber 11 is compressed by the large diameter upper part (c) of the fast descending valve shaft 6, so that the liquid is compressed to increase the pressure and to resist against the descending of the valve shaft 6 and the opened valve condition is kept. However, when the slow discharging of the liquid is kept, the liquid in the liquid chamber 11 is discharged from the sliding clearance between the valve shaft 6 and the bearing cylinder 8 to close the poppet valve 5.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a pressure increasing type dashpot of an agumulator in which the slippage is completely performed.

Conventionally, as shown in FIG. 1 of the drawings, the interior of a main body 1 of a container includes a gas chamber a filled with gas from an air supply means 3 through a bladder 2;
In an accumulator which is divided into a liquid chamber b through which liquid is taken in and taken out through the supply port 4, as shown in the same figure and FIG. Place the valve stem 6 of the valve 5 in the center of the supply/discharge port 4 (remove the valve opening lever 9 T and fit it into the IIQb receiver 8 with the part 2 inserted into the decompression chamber 7, Since it used a decompression type Danon unit with a piston 10 attached to the lower end that slides into the decompression chamber 7, when liquid is discharged from the pressure vessel 1 at a flow rate of 25 m/sec or more, the poppet valve 5 In response to the dynamic pressure, the piston 1o attempts to descend rapidly at +1, and the piston 1o is linked with the poppet valve to reduce the pressure in the decompression chamber 7. Therefore, a force is generated below the piston 1o that opposes the sudden descent of the poppet valve 5. However, the braking stroke 11 of the piston 10 is only about half of the rift t2 of the poppet valve 5, as shown in FIG.
When the poppet valve 5 is lowered to the position shown in the same figure, the piston 10 comes out of the pressure reducing chamber 7 and no braking occurs, so the poppet valve 5 suddenly closes under the dynamic pressure of the discharged liquid, causing a large valve closing shock. This not only causes malfunctions such as elongation of the valve stem 6 and deformation of the valve 5, but also has the drawback that the piston 10 and valve stem 6 of this pressure reducing type suffer from galling due to lack of oil, resulting in malfunction. there were.

The present invention has been made to solve the above-mentioned drawbacks, and when the poppet valve is about to close suddenly, the thick upper part of the valve 1qb compresses the liquid in the liquid chamber corresponding to the valve lift, causing the liquid to increase in pressure. The operation of suppressing sudden closing of the poppet valve is carried out at or near the closing cloth of the valve, so that the valve closes quietly without shock, and this prevents malfunctions such as deformation of the extended rib of the valve stem. First, it is an object of the present invention to provide an increased LI: type Gusoshbond accumulator in which each part of the valve stem is well lubricated and malfunction does not occur.

Next, the structure of the pressure increasing type accumulator according to the present invention will be described below with reference to the drawings.

Drawings 3 to 5 show improved parts of the accumulator shown in FIG.
, the upper part C is thicker than the lower part d (=J axis), and the bearing sleeve 8 into which this valve shaft 6 is fitted has a thick upper part C that fits into the valve shaft 6 at the upper part, and a thin lower part Ma that slides on the lower part. A liquid chamber 11 corresponding to the valve lift t2 of the poppet valve 5 is provided in the middle, and when the valve shaft 6 is fitted into this bearing sleeve 8 and the poppet valve 5 is about to descend suddenly, the liquid chamber 11 The liquid inside is compressed into the thick upper part of the valve stem 6, and the operation of providing closing resistance to the poppet valve 5 is performed during the entire stroke of A2 (usually the valve lift), and the above-mentioned valve closing resistance is If it is not required during the entire stroke of the valve lift t2, the upper side of the narrow lower part d of the valve stem 6 is made thinner so as to create a clearance 12 between it and the lower part of the stem valve cylinder 8, as shown in FIG. , this clearance 12
The liquid in the liquid chamber 1 is discharged downward, and the poppet valve 5 is made free before closing.

1) The pressure-intensifying Gutshu pot configured as described in 11 is:
When the poppet valve 5 is open as shown in FIG. Liquid is infiltrated through the sliding gap with the bearing sleeve 8.

Therefore, if the liquid in the main body of the container is 25 m/cm or more, the poppet valve 5 is
If you try to avoid sudden closing of the valve 4I, as mentioned above, the liquid filling the liquid chamber II (valve 4I) will suddenly drop down together with the poppet valve 5.
Since it is compressed by the thick L portion C of ll+6, the pressure is increased, and this pressure causes the valve shaft 6 to fall (resistance 1-).
The poppet valve 5 is prevented from closing suddenly due to the dynamic pressure and is kept open. However, as the fluid #l+ comes out, the bladder 2
When expands and gently pressurizes the poppet valve 5,
The liquid in the liquid chamber 11 is released from the sliding gap between the valve shaft 6 and the bearing sleeve 8, thereby closing the poppet valve 5. still,
When the valve stem 6 moves, the liquid in the liquid chamber 11 is released through the sliding gap between the valve stem 6 and the bushing 8, causing the valve stem 6 and the bushing 8 to slide. Since the surfaces are lubricated, the movement of the valve stem 6 is carried out smoothly and there is no occurrence of galling or the like.

As mentioned above, the pressure increase type dashpot according to the present invention fills the liquid chamber in the bearing cylinder with liquid, compresses this liquid with the thick upper part of the valve stem when the poppet valve is about to close suddenly,
The system increases the pressure of the liquid and uses this pressure to prevent the poppet valve from closing suddenly, so even if liquid is released from the main body of the container at a high speed of several tens of meters per second, the poppet valve will not close suddenly due to dynamic pressure. Therefore, a large valve closing shock caused by this will not occur, causing failures such as elongation of the valve stem or deformation of the valve, and a large amount of liquid will not remain in the main body of the container. When the poppet valve closes, reducing fluid utilization (which does not result in body entrapment).

In particular, this pressure-increasing system fills the liquid chamber with liquid, and when increasing the pressure, this liquid is press-fitted into the gap between the valve stem and the bearing sleeve. Since the liquid is introduced into the liquid chamber from one side and the liquid in the liquid chamber is discharged from the other side to constantly lubricate the sliding surfaces between valve 1+11 and the bearing sleeve, is the movement of the valve stem circular? It has a unique effect in that there is no risk of galling and malfunction due to smooth operation.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a conventional agumulator using a pressure-reducing dashpot. FIG. 2 is a longitudinal sectional front view showing the decompression type gutshupot. Figures 3 to 5 are longitudinal IF views showing the pressure booster pot according to the present invention. Figure 3 shows the poppet valve in an open state, Figure 4 shows it in a closed state, and Figure 5 shows the valve stroke. This figure shows the case of l/A in which braking is not performed at the end. In the figure, 1 is the main body of the container, 4 is the liquid supply port, and 5G maho. The bed valve, 6 is a stepped valve shaft with a thick upper part C and a 41H lower part, 8 is a bearing cylinder, and 11 is a liquid chamber.・：Patent applicant Nobuyuki Sugimura, WA) Figure 1＼ 20 Figure 2

Claims (1)

[Claims] The valve stem of the poppet valve that opens and closes the liquid supply/discharge provided in the main body of the accumulator container is a stepped shaft with the upper part thicker than the lower part, and this valve stem is installed in the center of the above-mentioned supply/discharge 1. A pressure-increasing type accumulator droplet is characterized in that the lower part of the accumulator is slidably fitted to the valve shaft, and the middle part is a bottom base of the bearing cylinder which serves as a liquid chamber.