JPH10238502A - Pressure booster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a function and safety by absorbing an increment of a liquid pressure due to an external heat, such as a solar heat, geothermy, and other drive heat for a device. SOLUTION: A pressure booster is constituted such that a gas accumulating chamber 4 communicated with a gas chamber 2 comprises a cylinder 10, partitioned into a gas chamber 2 and a liquid chamber 3 by a slidable built-in piston 11, and a housing 20. The piston 11 is operated by the pressure, serving as a power source, of compressed gas pressed in the gas chamber 2 and the gas accumulating chamber 4, and liquid in the liquid chamber 3 is fed to an actuator for valve drive through a piping connected to the liquid chamber 3 and the actuator for valve drive, and the actuator for valve drive is operated. In this case, a stopper body 31 to regulate the decrease of capacity of the gas chamber 2 due to a surplus return of the piston 11 is arranged in the gas chamber 2. Further, a spring 32 is arranged at the stopper body 31, and regulation of capacity of the liquid chamber 3 according to the increase and the decrease of a liquid pressure in the liquid chamber 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure booster serving as a power source of a valve driving actuator for operating a shutoff valve or a discharge valve provided in a gas or liquid pipeline.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory diagram of a piping system showing a valve drive device of a conventional general hydraulic storage operation system. Actuators 71 mounted on a valve 70 are provided on both sides of a motion conversion mechanism 72. By increasing or decreasing the hydraulic pressure in each of the hydraulic cylinders 73, 73, the built-in piston rod 7
4 is reciprocated, and the reciprocating linear motion of the piston rod 74 is converted into rotational motion by the motion converting mechanism 72.
The valve 70 is opened and closed.

The hydraulic pressure in the hydraulic cylinders 73, 73 can be increased or decreased by switching the hydraulic cylinders 73, 73, the pressure booster 80, and the liquid tank 75 through a switching valve 76, respectively. Cylinder 7
3, the oil pressure increased by the pressure booster 80 is press-fitted into the inside, the oil pressure is increased, and in the other hydraulic cylinder 73 connected to the liquid tank 75, the oil flows out to the liquid tank 75, Is decompressed.

[0004] The pressure booster 80 has a valve 79.
The pressure gas is supplied and discharged through the actuator 71, the pressure booster 80, and the liquid tank 75.
Are shaded portions where oil enters, and portions where the pressure booster 80 is dotted are portions where pressure gas enters.

FIG. 4 is a schematic half sectional view showing the pressure booster 80 in FIG. 3. The pressure booster 80 includes a cylinder 86 containing a piston 85 and a cylinder 86.
6 and a housing 81 forming a pressurized gas chamber 87 outside the cylinder 6.
Thereby, the gas chamber 88 and the liquid chamber 89 are separated. Further, on the outer periphery of the piston 85, a cylinder 8
6 are mounted, and these seal rings 91 and 92 are pushed to one side (to the right in the figure) by the pressure difference between the oil pressure and the gas pressure. And the sealing property is improved. Also,
90 is a stopper for the rightward movement of the piston 85, and 93 is a limit switch for the operation of the piston 85.

In the pressure booster 80, the pressure gas is sent into a gas chamber 88 and a pressure accumulating gas chamber 87 of a cylinder 86 via a supply / exhaust port 82 and accumulates the pressure. Pressure is increasing. The pressure of the oil pressed into the liquid chamber 89 side of the piston 85, that is, the liquid chamber 89 between the piston rod 84 and the cylinder 86, is inversely proportional to the ratio of the gas pressure acting area to the piston 85 to the oil pressure acting area. The pressure has been increased. When these pressure increases are completed, the gas pressure and the liquid pressure applied to the piston 85 are balanced, and the piston 85 stops. The rest position of the piston 85 at this time becomes a reference position, and the stopper 90 is formed so that the piston 85 does not move toward the gas chamber 88 from this position. At this time, the piston 85 applies a load of 0 k to the stopper 90.
g.

In this state, when the flow path from the liquid chamber 89 to the actuator 71 and the flow path from the actuator 71 to the liquid tank 75 are communicated, the oil in the liquid chamber 89 flows to the actuator 71, Is reduced, the piston 85 moves to the liquid chamber 89 side, and accordingly, the pressure in the gas chamber 88 is reduced, and the pressure accumulating gas chamber 87
Gas flows into the gas chamber 88 and the actuator 71
Opens or closes valve 70.

Thereafter, an electric pump 77 or a manual pump 78 is communicated with the liquid chamber 89, and the electric pump 77 or the manual pump 78 opposes the pressure of the gas in the accumulated gas chamber 87 and the gas chamber 88.
Alternatively, the oil is pressed into the liquid chamber 89 from the liquid tank 75 by the manual pump 78, and the piston 85 is returned to the reference position. At this time, the piston 85 contacts the stopper 90 with a load of 0 kg, and the gas pressure in the accumulator gas chamber 87 and the gas chamber 88 is increased to the set pressure.

[0009]

Conventionally, in consideration of the fact that the liquid pressure in the pressure booster liquid chamber rises due to the action of external heat such as the sun, a safety valve or the like is provided in a pipe connected to the liquid chamber of the pressure booster. However, there was no pressure booster itself that could cope with this increase in liquid pressure.

The present invention has been made in view of improving the safety of the entire circuit using a pressure booster.
It is an object of the present invention to provide a pressure booster that can cope with an increase or a decrease in liquid pressure due to a change in external air temperature or the like.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a piston which is slidably housed, and comprises a cylinder and a housing which separate the interior into a gas chamber and a liquid chamber. A pressurized gas chamber communicating with the gas chamber and the pressure of the compressed gas press-fitted into the pressurized gas chamber is used as a power source to operate the piston, and the liquid is connected via a pipe connected to the liquid chamber and the valve driving actuator. In the pressure booster that supplies the liquid in the chamber to the valve driving actuator and operates the valve driving actuator, a stopper body that regulates a decrease in the capacity of the gas chamber due to excessive return of the piston is provided in the gas chamber. The main body is provided with a spring so that the capacity of the liquid chamber can be increased or decreased according to the increase or decrease of the liquid pressure in the liquid chamber. Tsu is absorbed by the elastic force of the spring provided in the path body. The liquid in the liquid chamber is preferably oil.

The pressure receiving area of the piston on the liquid chamber side may be formed smaller than the pressure receiving area of the gas chamber side, and the pressure of the liquid in the liquid chamber may be increased.
Even if the amount of liquid in the liquid chamber is small, the valve driving actuator can be operated.

[0013]

FIG. 1 is a schematic sectional view showing an embodiment of a pressure booster according to the present invention.
Has a piston 11 slidably built in a cylinder 10, the interior of the cylinder 10 is separated into a gas chamber 2 and a liquid chamber 3, and a substantially cylindrical housing 20 is provided outside the cylinder 10. A pressurized gas chamber 4 is formed between the housing 10 and the housing 20, and a stopper 30 for preventing excessive return of the piston 11 is provided in the gas chamber 2 of the cylinder 10.

The gas to be pressurized into the gas chamber 2 is appropriately selected from air, gas, nitrogen, carbon dioxide or a mixture thereof, while the liquid to be pressurized into the liquid chamber 3 is oil, water or The liquid may be appropriately selected from among these mixed liquids and the like, but it is necessary to select a liquid that can also be used for a valve driving actuator (not shown) to be connected.

The piston 11 is formed in a short tubular shape and has a hollow piston rod 12 having a diameter smaller than the diameter of the piston 11.
Is protruded from the liquid chamber 3 side, and is further made of rubber or P for sealing between the outer peripheral surface of the piston 11 and the inner peripheral surface of the cylinder 10.
Attach two seal rings 13 made of TFE to the outer peripheral surface,
The gas in the gas chamber 2 and the liquid in the liquid chamber 3 are prevented from entering the other chamber. The liquid chamber 3 is formed so as to be able to press-in more than the liquid amount necessary for one operation of the valve driving actuator.

The housing 20 is built into the cylinder 10 with an external cylinder 21 forming the accumulated gas chamber 4 with the cylinder 10, a head cover 22 for closing the opening of the gas chamber 2 and one opening of the accumulated gas chamber 4. It has a sliding hole 23a for penetrating the piston rod 12 of the piston 11 in a liquid-tight manner, and is constituted by a rod cover 23 for closing the opening of the liquid chamber 3 and the other opening of the accumulated pressure gas chamber 4.

The head cover 22 is provided with a gas filling port 22a for connecting a gas supply pipe, and a gas passage 22b communicating with the gas filling port 22a, the gas chamber 2 and the pressure accumulating gas chamber 4. ing. The rod cover 23 has a sliding hole 2 through which the piston rod 12 passes.
3a, a liquid inlet / outlet 23 for connecting a liquid inlet / outlet pipe.
b, and a liquid passage 23c communicating the liquid port 23b with the liquid chamber is formed. In addition,
A limit switch 41 is fixed to a cylindrical body 40 protruding from the end surface of the rod cover 23 along the direction in which the piston rod 12 protrudes.

The stopper 30 has a substantially cylindrical stopper body 31 fitted to the end of the cylinder 10 on the head cover side.
And a spring 32 fixed to the end surface of the stopper body 31 on the piston 11 side. The spring shown in FIG. 1 is a disc spring, but is not limited to this, and may be a coil spring, a leaf spring, or the like.

In the state where the gas pressure and the liquid pressure applied to the piston 11 are balanced, the stationary piston 1
The length of the stopper 30 is determined so that the spring 32 comes into contact with 1, and the volume of the liquid chamber 3 is increased by moving the piston 11 by bending the pressure increasing pressure of the liquid heated by the external heat. Then, a spring having performance capable of absorbing is selected.

Hereinafter, the operation of the above-described pressure booster will be described. First, high-pressure gas is introduced into the accumulator gas chamber 4 and the gas chamber 2 from the gas filling port 22a of the head cover 22 via the gas passage 22b, and the gas pressure in both chambers 2 and 4 is increased to the set pressure, and The liquid pressure in the chamber 3 is increased (for example, liquid pressure / gas pressure = 2.5). At this time, the liquid pressure in the liquid chamber 3 is higher than the gas pressure in the gas chamber 2.
The pressure is increased in inverse proportion to the ratio of the pressure receiving area of the piston 11 on the gas chamber 2 side to the pressure receiving area on the liquid chamber 3 side. The liquid is press-fitted into the liquid chamber 3, the cylinder of the valve driving actuator (see FIG. 3), and the pipe connected to the liquid chamber 3.

When the gas pressure in the accumulator gas chamber 4 and the gas pressure in the gas chamber 2 and the liquid pressure in the liquid chamber 3 have been increased, the piston 11
Gas pressure and liquid pressure applied to the piston 1
1 comes to rest. The rest position of the piston 11 at this time becomes the reference position, and the spring 32 contacts the piston 11 with a load of 0 kg.

Thereafter, the pressure booster body 1 and the liquid chamber 3
The pressure of the liquid press-fitted into a pipe connecting the valve and the valve driving actuator rises due to the influence of external heat, for example, solar heat, geothermal heat, drive heat of other devices, and the like, and the liquid pressure moves the piston 11 to the reference position. When pressed toward the gas chamber 2, the spring 32 bends to absorb the increased pressure of the liquid pressure, thereby preventing the ratio between the liquid pressure and the gas pressure from fluctuating greatly.

Then, when the liquid temperature decreases and the liquid pressure returns to its original state, the piston 11 returns to the reference position by the elastic force of the spring 32, and the load of the spring 32 pressing the piston 11 is eliminated.

In consideration of the case where the temperature of the liquid decreases and the liquid pressure decreases, the deflection at the reference position of the piston 11 is equal to the moving length of the piston 11 due to the decrease in the liquid temperature at the lowest temperature in advance. On the other hand, a spring 3 which comes into contact with the piston 11 and can be further flexed to the same extent as the movement length of the piston 11 accompanying the rise of the liquid temperature at the maximum temperature.
2 is preferably provided on the stopper body 31.

Next, another embodiment of the pressure booster of the present invention will be described. The same components as those of the pressure booster shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 2, the stopper 50 of the pressure booster has a cylindrical fixing portion 5 that is screwed and fixed to the inner surface of the head cover 22.
1, a shaft portion 52 protruding from the fixed portion 51 along the moving direction of the piston 11, a substantially cylindrical contact portion 53 moving along the shaft portion 52, and the contact portion 53. , And a spring 55 that presses in the direction of the piston 11.

The fixed portion 51 and the fixed portion 51 are moved so that the gap between the tip of the shaft portion 52 and the end surface of the piston 11 at the reference position is longer than the moving length of the piston 11 accompanying the rise of the liquid temperature at the maximum temperature. The length of the shaft portion 52 is selected to secure the moving range of the piston 11, and the stroke of the contact portion 53 is controlled by the rise of the piston 11 due to the rise of the liquid temperature at the maximum temperature.
The length of the shaft 5 is set to be equal to or longer than the movement length of the piston 11 due to the decrease in the liquid temperature at the lowest temperature.
2, the length of the piston 11 of the contact portion 53 is selected.
The length of the contact portion 53 is selected such that the contact surface always projects toward the piston 11 from the tip surface of the shaft portion 52.

Although a plurality of stacked disc springs are used as the spring 55 in the drawing, the present invention is not limited to this, and a coil spring, a leaf spring or the like may be used. Although not shown, a similar stopper is provided on the head cover 22.
Are provided.

As in the case of the pressure booster shown in FIG. 1, the pressure of the liquid press-fitted into the pressure booster main body 1, the pipe connecting the liquid chamber 3 to the valve driving actuator, and the like is changed by external heat, for example, solar heat, geothermal, and other devices. When the piston 11 is pressed toward the gas chamber 2 from the reference position, the spring 55 bends to absorb the increased pressure of the liquid pressure, and the liquid pressure and the gas pressure are increased. Is prevented from greatly changing.

When the liquid temperature decreases and the liquid pressure returns to its original state, the piston 11 returns to the reference position by the elastic force of the spring 55, and the load of the spring 55 pressing the piston 11 is eliminated. Further, like the pressure booster shown in FIG. 1, the pressure booster can be formed in consideration of the case where the temperature of the liquid decreases and the liquid pressure decreases.

[0030]

As described in detail above, the present invention improves the function and safety by absorbing the increased pressure of the liquid pressure which rises due to external heat such as solar heat, geothermal heat and other device driving heat. can do.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a pressure booster of the present invention.

FIG. 2 is a partial schematic sectional view showing another embodiment of the pressure booster of the present invention.

FIG. 3 is an explanatory diagram of a piping system of a valve drive device using a conventional pressure booster.

FIG. 4 is a schematic sectional view showing a conventional pressure booster.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure booster main body 2 Gas chamber 3 Liquid chamber 4 Accumulated gas chamber 10 Cylinder 11 Piston 31 Stopper main body 32 Spring 51 Stopper main body 55 Spring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sadayuki Nakanishi 1-32-11 Shinmachi, Nishi-ku, Osaka-shi, Osaka Prefecture Kitz Osaka Branch Office (72) Inventor Yoshiharu Sato 2040 Nagasaka Kamijo, Nagasaka-cho, Nagakoma-gun, Yamanashi Prefecture Kitz Nagasaka Factory Co., Ltd. (72) Inventor Akio Fukunaga 1-32-11 Shinmachi, Nishi-ku, Osaka-shi, Osaka Kitz-Osaka Branch Office

Claims (3)

[Claims] 1. A pressure-accumulating gas chamber communicating with a gas chamber is formed by a cylinder and a housing having a piston slidably housed therein and having a cylinder and a gas chamber interposed between the gas chamber and the liquid chamber. Using the pressure of the compressed gas pressurized into the actuator as a power source, the piston is operated, and the liquid in the liquid chamber is supplied to the valve driving actuator through a pipe connected to the liquid chamber and the valve driving actuator. In the pressure booster that operates the actuator, a stopper body that regulates a decrease in the capacity of the gas chamber due to excessive return of the piston is provided in the gas chamber, and a spring is provided in the stopper body, and the stopper body is provided according to the increase or decrease of the liquid pressure in the liquid chamber. A pressure booster characterized in that the capacity of the liquid chamber can be increased or decreased. 2. The pressure receiving area of the piston on the liquid chamber side,
The pressure booster according to claim 1, wherein the pressure booster is formed smaller than the pressure receiving area on the gas chamber side to increase the pressure of the liquid in the liquid chamber. 3. The liquid in the liquid chamber is oil.
Or the pressure booster according to any one of 2 to 5.