JPH0477161B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bladder-type accumulator that allows daily gas pressure checks to be easily and reliably carried out while storing liquid.

Conventionally, hydraulic fluid is injected into a piston-type accumulator to operate the piston, and when the piston moves to a predetermined position, a piston position detection device is activated to detect that a predetermined amount of hydraulic fluid has entered the piston-type accumulator. When the accumulator is detected, a timer starts counting from that point, and when the timer times out, the injection of hydraulic oil into the piston-type accumulator is stopped.
It is known from the publication No. 58-55163.

Furthermore, in a piston-type accumulator, the inner cylinder chamber is divided into an oil chamber and a gas chamber by a floating piston that moves freely therein, and gas is sealed in the gas chamber and pressurized oil is introduced into the oil chamber. A slider is provided on the cylinder wall on the gas chamber side in an airtight manner with the tip thereof protruding from the inner surface of the cylinder wall so that it is moved by being pushed by the piston when the piston advances toward the gas chamber side beyond a certain level. An accumulator having a structure that is provided with means for detecting movement of a mover is known from Japanese Patent Application Laid-Open No. 52-52218.

Furthermore, the cylinder interior is divided into an oil chamber and a gas chamber by a floating piston that moves freely within the cylinder.
In a piston-type accumulator in which gas is sealed in the gas chamber and pressure oil is introduced into the oil chamber, a stopper is installed in the gas chamber to restrict the movement of the piston, and the gas pressure in the gas chamber and the oil pressure in the oil chamber are An accumulator with a pressure detection means for detecting the differential pressure between the
It is known from the publication No. 13125.

However, the accumulator described in JP-A No. 58-55163 mentioned above has a function that activates a detection device when the piston compresses gas and reaches a limit position to stop the supply of liquid to the accumulator. However, it does not have a function to check the suitability of gas pressure while liquid is accumulated in the liquid chamber, so daily gas pressure checks based on the provisions of Article 12, Item 25 of the General High Pressure Gas Maintenance Regulations are limited to checking the pressure system. This must be done by closing the main valve, opening the drain valve, emptying the liquid chamber by releasing the accumulated liquid, measuring the pressure of the gas in the gas chamber, and then accumulating liquid in the liquid chamber again. There are some unavoidable problems.

Also, JP-A-52-52218 and JP-A-51-113215
The accumulator described in the publication has a function that activates a detection means using a piston to prompt gas replenishment when gas leakage reaches its limit. These accumulators also do daily gas pressure checks by closing the main valve of the pressure system, opening the drain valve, and then checking the gas pressure every day.
There is a problem in that the liquid chamber must be emptied by discharging the accumulated liquid, the pressure of the gas in the gas chamber is measured, and then the liquid must be accumulated in the liquid chamber again, which is a cumbersome operation.

The present invention was made to solve the above-mentioned problems, and the expansion and contraction range of the bladder is regulated using two detectors, so that the liquid accumulation time and accumulation pressure do not change unless the gas pressure changes. It is an object of the present invention to provide a convenient bladder-type accumulator that can accurately check the suitability of gas pressure while storing liquid by simply establishing the conditions and looking at the time and pressure.

The means of the present invention for achieving the above object is to divide the interior of the main body of the container into two chambers using a bladder, fill one chamber with gas using an enclosure, and compress the gas into the other chamber from a supply/exhaust pipe. In the bladder type acumulator, a detector is provided in the bladder which is activated by the bladder to stop the supply of liquid at its contraction limit, and a valve body is installed in the supply/discharge tube at the expansion limit of the bladder. The structure includes a detector that is activated by an interlocking actuator to start feeding the liquid.

Next, the function of the bladder-type accumulator of the present invention is as shown in FIG. 1. When the bladder 2 is filled with gas from the gas enclosure 3 attached to the container main body 1, the bladder 2 is filled with the container main body 1 due to the pressure of the gas. Since it expands to match the internal shape and suppresses the valve body 7 with its bottom, the valve body 7 descends and closes the upper end of the supply/discharge cylinder 4, and at the same time is attached to the valve shaft 8 and interlocks with the valve body 7. Since the actuator 12 acts on the detector 11 for starting liquid feeding, which is attached to the outside of the supply/discharge tube 4, the detector 11 is activated to start feeding the liquid to the accumulator.

Then, the liquid is introduced into the container main body 1 of the accumulator and compresses the bladder 2 expanded by the gas from the outside. The bladder 2, which is formed in a straight cylinder shape and has a low pressure resistance, is configured such that the body portion, which has a small pressure resistance, contracts inward.
If this contraction occurs irregularly, the bladder 2 is likely to be damaged, and the detector described below will not operate correctly using the bladder 2. Therefore, Kazuo Sugimura, the father of the present inventor, invented The technology invented in Japanese Patent Publication No. 39-8340, which succeeded in dramatically improving the volumetric efficiency and durability of the bladder and became well known in the industry, namely:
A technology in which a thick part and a thin part are arranged vertically on the body (peripheral wall surface) of a bladder (elastic bag body), and the bladder is deformed into a star-shaped column shape by bending the thick part and the thin part and using the difference in drag. By adopting , the peaks of the star shape maintain the shape shown in the left half of Figure 1, but the valleys shrink inward from the bottom to the top, as shown in the right half of Figure 1. and performs an operation to charge and accumulate liquid into the container main body 1, and when the accumulated amount of liquid reaches a specified value,
Since the upper part of the recess in the body acts on a detector 9 for stopping liquid feeding installed inside the bladder 2, the detector 9 is activated and stops the liquid feeding.

Moreover, if the accumulated liquid is discharged from the container main body 1 to the load equipment as described above, the bladder 2
expands due to gas pressure, closes the valve body 7 upon completion of liquid discharge, and activates the detector 11 attached to the supply/discharge tube 4 for starting liquid feeding by the actuator 12 interlocked with the valve body 7. , this detector 11 starts liquid feeding, and when the bladder 2 contracts due to the liquid feeding and accumulates a specified amount of liquid in the main body 1 of the container, the bladder 2 activates the detector 9 for stopping the liquid feeding. The two detectors 9 and 11 detect the operation to stop the liquid feeding.
Because it repeats accurately within a certain range due to the action of The following conditions hold true.

The operation of the hydraulic circuit in which the bladder-type accumulator operating as described above is installed in the circuit as shown in FIG. 2 will be explained as follows.

When starting this hydraulic circuit, as shown in FIG.
When the bladder 2 is filled with gas, the gas pressure inside it increases as the bladder 2 expands, and this pressure is displayed on the pressure gauge g ₁ attached to the enclosure 3. For example, if the pressure rises to 1 kg/cm ² Stop filling when it becomes loose.

Then, the valve body 7 is closed by being pressed by the bladder 2, and the actuator 12, which is interlocked with the valve body 7, acts on the detector 11 for starting liquid feeding, thereby opening the no-load starting valve 16 and starting the motor 14. and start the
At this time, since the liquid storage valve 19 is closed, the motor 1
The liquid sent by the pump 13 driven by the pump 13 flows from the no-load starting valve 16 to the drain and does not create resistance, so the motor 14 starts without any load and quickly enters rated operation.

When the motor 14 enters rated operation, the rotation detector 1
7 detects this and opens the liquid storage valve 19 and closes the no-load starting valve 16. Therefore, the liquid sent by the pump 13 flows from the liquid storage valve 19 into the container main body 1 of the accumulator by contracting the bladder 2. As the gas pressure inside the bladder 3 increases, the gas pressure rises to, for example, 2 kg/cm ² in 10 minutes, and at this point the deflated bladder 2 acts on the detector 9 for stopping the liquid supply, causing the detector 9 to stop. The motor 14 is set to stop and the liquid storage valve 19 is closed by 10 minutes of the time required to accumulate liquid at this start, and the liquid pressure at the end of accumulation, or equal to this. The gas pressure inside bladder 2 is 2Kg/cm ² ,
Record it as a reference value for daily gas pressure checks, and supply the accumulated liquid to the load equipment (not shown in the drawing) using the liquid supply valve 20 to operate the load equipment to perform the desired work and complete the day's work. When the process is completed, the pressure liquid is released using a relief valve or the like, as is known in the art, and the hydraulic circuit is left unpressurized.

Then, when starting work the next day, the bladder 2 expands and the actuator 12 interlocked with the valve body 7 activates the detector 11 for starting liquid feeding, thereby opening the no-load starting valve 16 and starting the motor. 14 is activated to start liquid feeding, and at the same time, time measurement using a clock is started, and the liquid fed contracts the bladder 2 and is accumulated in the container main body 1, and the contracted bladder 2 stops the liquid feeding. The detector 9 is activated to measure the time until the motor 14 is stopped, the liquid storage valve 19 is closed, and liquid feeding is stopped, and the liquid pressure at the end of storage is measured. Or check the gas pressure in the bladder with pressure gauge g ₂ or pressure gauge g ₁ , and the accumulation time is 10 minutes.
If the accumulated pressure is 2Kg/cm ² and matches the set value mentioned above, there is no change in the gas pressure inside the bladder 2, indicating that there is no abnormality in the liquid delivery system.If there is a change in pressure, If the gas pressure decreases or changes over time, it is clear that there is an abnormality in the liquid delivery system.

Embodiments of the bladder type accumulator according to the present invention will be described below with reference to the drawings.

Figure 1 of the drawings is a longitudinal sectional front view showing the configuration of this bladder-type accumulator with some parts omitted. It is formed into a pressure-resistant shape.

Reference numeral 2 denotes a bladder to be accommodated in the container main body 1, which is made of a flexible elastic material such as rubber and has a hemispherical bottom and a top, and a straight cylindrical body, and the top side is fixed to the container main body 1. When pressurized gas is sealed into the inside of the container body 1 using an enclosure device to be described later, the bladder 2
When the bladder 2 expands to match the internal shape of the container body 1 and sends pressurized liquid into the container main body 1, the pressure resistance of the straight cylindrical body of the bladder 2 is smaller than the pressure resistance of the hemispherical bottom. The liquid is stored in the container main body 1 by contracting so that a part of the liquid is concave inward from the bottom to the top. In order to efficiently carry out this process, the technique disclosed in Japanese Patent Publication No. 39-8340 mentioned above is adopted.

Reference numeral 3 denotes a gas enclosure device attached to the side of the container main body 1 where the bladder 2 is attached, and a pressure gauge g ₁ is attached thereto based on the provisions of the High Pressure Gas Control Law, and the gas is sealed into the bladder 2 using this pressure gauge g ₁ . Display the gas pressure.

4 is a liquid supply/discharge tube provided on the bottom side of the container main body 1, and the upper part that communicates with the container main body 1 is made of steel, and is made of SUS304 that will not be magnetized even if a magnet actuator (described later) is attached to the center thereof. A valve shaft 8 is supported, and a valve body 7 that is opened by a spring 6 and closed by the bladder 2 is attached to the upper end of the valve shaft 8. It is made of magnetically conductive SUS304, and is provided with an inlet/outlet 5 on one side thereof through which liquid enters and exits the container main body 1 via a supply/discharge tube 4.

The material of the valve shaft 8 and the lower part of the supply/discharge pipe 4 is as follows:
Of course, copper, aluminum, synthetic resin, etc. other than the above-mentioned SUS304 can also be used.

Reference numeral 9 denotes a detector for stopping liquid feeding, which is supported by a holder 10 hanging vertically from the container main body 1 into the bladder 2 and is provided inside the bladder 2, and when the liquid fed into the container main body 1 compresses the bladder 2. Therefore, when the body of the bladder 2 contracts inward and accumulates liquid in the container main body 1, and reaches the contraction limit, the upper part of the recess of the bladder 2 approaches the detector 9, or When contacted, it is activated and causes the motor 14 to stop and the liquid storage valve 19 to close in the circuit diagram of FIG.

Reference numeral 11 denotes a detector for starting liquid feeding, which is attached to the thin part of the lower part of the above-mentioned supply/discharge tube 4 through which the magnetism passes. When the body 7 is occluded, the detector 1
1, the no-load starting valve 16 is opened and the motor 14 is started.

FIG. 2 shows a hydraulic circuit diagram using the bladder type accumulator of the present invention. In this circuit diagram, reference numeral 13 is a liquid feeding pump which, when driven by a motor 14, sucks liquid from a tank 15. The liquid is fed under pressure to the container main body 1 of the accumulator and accumulated therein.

16 is a no-load start valve for the motor 14 mentioned above;
When the motor 14 is started, it is opened by the detector 9 for stopping the liquid supply, and the liquid sent from the pump 13 is allowed to flow to the drain, and the motor 14 is started with no load without applying resistance to the pump 13. Started motor 1
4 enters the rated operation, the rotation detector 17 detects this and closes the pump 13, so that the liquid sent to the drain by the pump 13 is sent to the container main body 1 and accumulated there by opening the liquid storage valve to be described later.

Reference numeral 18 denotes a relief valve for setting the operating pressure of the hydraulic circuit.When the pressure is below the set pressure, it closes to maintain the circuit pressure, but when the set pressure is exceeded, it opens and releases the liquid to the drain.

g ₂ is a pressure gauge which is installed near the relief valve 18 in the hydraulic pressure circuit as is known and displays the pressure of the liquid, and with this it is possible to display the pressure of the liquid accumulated in the container body 1 of the accumulator. Since the pressure of the liquid acts on the internal gas through the bladder 2 and is always kept equal to the gas pressure, the gas pressure can be determined from this pressure, and the pressure gauge g ₁ of the gas enclosure 3 described above can be omitted. It is something that can be done.

Reference numeral 19 denotes a liquid storage valve that is linked to the no-load start valve 16, which is closed when the no-load start valve 16 opens to allow liquid from the pump 13 to flow to the drain, but when the motor 14 starts no-load. When the rotation detector 17 detects this and closes the no-load start valve 16 and opens the liquid storage valve 19, the liquid from the pump 13 is sent to the main container body 1 of the accumulator. Accumulate in.

20 is a liquid sending valve for feeding the pressure liquid accumulated in the accumulator to the load equipment, which is opened and closed by a known operation panel or sequencer to control the supply of liquid to the load equipment, and is used to control the supply of liquid to the load equipment as desired. It causes the user to perform certain actions.

As mentioned above, the bladder type accumulator of the present invention performs a daily gas pressure check based on the provisions of Article 12, Item 25 of the General High Pressure Gas Maintenance Regulations, while keeping liquid stored, by checking the liquid accumulation time and accumulated pressure. You can do it easily and reliably just by looking at it.

Since the range of contraction and expansion of the bladder is precisely regulated by two detectors, the pressure and volume of the accumulated liquid can be kept accurately constant, enabling highly accurate and stable operation of devices that use this pressure liquid as the operating source. shall be.

Since the bladder is not forced to undergo excessive deformation due to the limited range of contraction and expansion, damage to the bladder is prevented and it can be fully adapted to severe usage conditions such as continuous operation 24 hours a day.

It has unique effects such as:

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing the configuration of an embodiment of a bladder-type accumulator according to the present invention, with some parts omitted. FIG. 2 is a hydraulic circuit diagram using the same accumulator. 1... Container body, 2... Bladder, 3... Gas enclosure, 4... Liquid supply/discharge tube, 9... Detector for stopping liquid feeding, 11... Detector for starting liquid feeding.

Claims (1)

[Claims] 1. In a bladder type accumulator which divides the interior of the main body of the container into two chambers by a bladder, seals gas in one chamber with a sealing device, and supplies liquid by compressing the gas from a supply/exhaust tube to the other chamber, the above-mentioned A detector is provided in the bladder, which is activated by the bladder to stop the supply of liquid at its contraction limit, and is activated by an actuator interlocking with the valve body to supply liquid to the supply/discharge tube at the expansion limit of the bladder. A bladder-type accumulator characterized by being equipped with a detector that starts.