KR850001026Y1 - Fluid pressure leakage detector - Google Patents

Abstract

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Description

Fluid Pressure Leak Detector

1 is a block diagram showing a general fluid supply system.

2 is a cross-sectional view showing the structure of the present invention.

3 is a block diagram showing an example in which the present invention operates a known valve shut-off circuit.

4 is a schematic diagram illustrating the operation of the present invention. FIG. 4 (a) is a schematic diagram of the maximum pressure in the conduit, FIG. 4 (b) is a schematic diagram showing the operation during rapid leakage, and FIG. 4 (c) is a slow diagram. Schematic diagram showing operation in case of leakage.

* Explanation of symbols for main parts of the drawings

3: conduit 6: first detection room

7: 2nd detection room 8,9: expansion membrane

10: long axis 12: short axis

11: great anti-aircraft 13

The present invention relates to a fluid pressure leak detector.

Fluid fed through the pipeline is generally fed from the fluid storage tank to the valve via a conduit via a regulator, as shown in FIG. At this time, if the feeding line is broken by an external factor, a large amount of fluid leakage must be taken, and even when the feeding fluid is flammable, it may cause a larger accident. Therefore, there is a need for a device that detects a fluid leak and performs an alarm or safety treatment.

Various devices have been conventionally proposed for detecting a leak of fluid, but the ball valve is displaced according to the change of the fluid pressure to close the conduit, the electronic shutoff circuit, and the fluid passage in the case of gas such as gas. By passing through to the reservoir, bubbles are generated in the reservoir, so that the amount of bubbles generated at this time is observed so that fluid leakage can be known.

While all of the above methods require precise fabrication, there is a drawback that malfunctions are severe and not practical.

The object of the present invention is to provide a fluid pressure leak detector that maintains the fluid pressure in the pipeline within a certain range and detects when the internal pressure decreases due to leakage to operate a separate shutoff device and alarm device. A secondary object of the present invention is to provide a fluid pressure leak detector that can detect a fluid leak quickly and accurately by performing differential detection by detecting a rapid leak and a slow leak.

The present invention installs a housing divided into two separate rooms on a conduit according to the above-mentioned purpose, and installs a telescoping membrane such as a diaphragm or a bellows inside the housing, and expands and contracts the telescoping membrane to the telescoping membrane respectively. According to the expansion and contraction of the membrane, the long axis and the short axis are configured to slide, and each of the long axis and the short axis is equipped with a switching mechanism and a switching operation mechanism. If so described in detail according to the accompanying drawings as follows.

As shown in FIG. 2, the first detection chamber 6 and the second detection chamber 6 are attached by binding the housing 5 divided by the partition wall 4 onto the conduit 3 having the inlet 1 and the outlet 2 as shown in FIG. The detection chamber 7 is integrally formed, and both detection chambers 6 and 7 are electrically connected to each other at the boundary between the conduit 3 and the both detection chambers 7 and 6 via the expansion and contraction membranes 8 and 9 respectively. In addition to the conduit (3) to form a separate space, the first detection chamber (6) of the expansion membrane (8), the long axis (10) in the speech, and the air hole (11) in the upper place Moreover, the short axis 12 is made to speak to the expansion and contraction film 9 of the 2nd detection chamber 7, and the small hole 13 is installed above.

Due to this structure, the upper ends of the long axis 10 and the short axis 12 protrude long and short to the outside of the housing 5. The protruding long shaft 10 has a movable magnet 14 attached to the tip thereof.

On the other hand, an arm 16 is installed at an upper end of the short axis 12 in an orthogonal direction, and the first lead switch 17 is attached to one side corresponding to the movable magnet 14 described above, and the second lead switch 18 is mounted on the other side thereof. Attach.

The first lead 17 described above is normally juxtaposed with the movable magnet 14 at an interval L so that the first lead 17 is turned on or off when placed within the magnetic field range of the movable magnet 14. Further, the second lead switch 18 is juxtaposed with the stator magnet 15 fixed to the upper surface of the second detection chamber 7 at an interval L 'and is turned on in the same manner.

The upper end, which is the exposed portion of the long axis 10 and the short axis 12, is sealed by the cap 19, and operates inside the cap 19 when the movable magnet 14 of the long axis 10 is raised upward. The third lead switch 20 is attached.

The first, second and third lead switches 17, 18 and 20 are all open switch types, and the first and second detection chambers 6 and 7 described above are covered by the cap 19. . When the hydraulic pressure is filled in the conduit 3 by the above-described configuration and the pressure is greater than the intrinsic pressure of the first and second detection chambers 6 and 7, the expansion and contraction membranes 8 and 9 are expanded and at the same time 10) and the short axis 12 are slid upward in cooperation. At this time, the ascending speed of the long axis 10 and the short axis 12 is different by the diameter ratio of the large hole 11 and the small hole 13 drilled in both detection chamber (6) (7). In other words, the long axis 10 on the large hole 11 side with a large amount of inflow and outflow of the outside air rises faster than the short side 12 on the small hole 13 side where the pressure is relatively difficult to enter and exit. The differential detection is performed according to the speed difference between the long and short axes 10 and 11 as described above.

In the present invention, the first, second and third lead switches 17, 18 and 20 installed in the first and second detection chambers 6 and 7 are connected to a known valve shutoff circuit C as shown in FIG. The circuit breaker S of the solenoid valve V is operated. Hereinafter will be described the operation and effect by connecting the present invention to a known valve shut-off circuit.

First, when the switch SW ₁ of the solenoid valve V is turned on, the solenoid valve V is opened to fill the pressure in the conduit 3, and the long axis 10 and the short axis 12 are interlocked with each other as shown in FIG. 4 (a). At this time, when the long shaft 10 rises faster than the short shaft 12 and the third lead switch 20 is turned on, a signal is applied to the abnormality check circuit a of the valve shutoff circuit C so that the solenoid valve V is closed, and then to the delay circuit b. The solenoid valve V is reopened only when steady state is released after 1 10 seconds is released. That is, when no signal is sent from the first and second lead switches 17 and 18 to the abnormality check circuit, the solenoid valve V is opened again.

In this state, when a pressure drop in the conduit 3 occurs, a large pressure difference is generated between the conduit 3 and the first and second detection chambers 6 and 7, so that the expansion and contraction membranes 8 and 9 Will receive negative pressure. However, since the first detection chamber 6 has a larger amount of inflow and outflow than the second detection chamber 7, there is a difference in negative pressure between the two detection chambers 6 and 7. Therefore, the restoration speed of both expansion and contraction membranes 8 and 9 is increased. Will be different.

Therefore, since the long axis 10 descends faster than the short axis 12, the movable magnet 14 of the long axis 10 encounters the first lead switch 17 of the short axis 12, as illustrated in FIG. 4 (b). As a result, the switching circuit d of the valve blocking circuit C is operated, and the signal is applied to the breaker s and the alarm f through the blocking command circuit e so that the solenoid valve V is closed and a separate alarm device is operated.

In the above process, the long axis 10 descends faster than the short axis 12 and is interlocked only in the case of rapid leakage, and the negative pressure between the first and second detection chambers 6 and 7 in the case of slow leakage with a small amount of fluid leakage. No tea That is, since the negative pressure as long as the short axis 12 detects a slow leak and is interlocked with the downward movement does not exert a force enough to lower and interlock the long axis 10 faster than the short axis 12, the long axis 10 at the time of slow leakage. The descending speeds of and short axis 12 are approximately equal.

Therefore, the movable magnet 14 of the long shaft 10 and the first lead switch 17 of the short axis 12 are not able to meet, but the second lead switch 18 of the short axis 12 is in the third (c) degree. As shown in the figure, it encounters the stationary magnet 15 and operates the switching circuit f of the valve blocking circuit C and applies it to the blocking command circuit e to operate the breaker s and the alarm g so that the solenoid valve V is closed and a separate alarm device is provided. Will be working.

EXAMPLE

As shown in FIG. 3 (a), the solenoid valve V provided with the regulator R is connected to the inlet 1 side, and the hydraulic pressure in the conduit 3 is the internal pressure of the first and second detection chambers 6 and 7. Randomly select so that the maximum axis 100 and the minimum axis 50 are proportional to each other, so that the long axis 10 and the short axis 12 slide to the top dead center at a maximum of 100, and the long axis 10 and the short axis 12 slide to the bottom dead center at a minimum of 50. Then, during rapid leakage, the large holes 10 and the small holes 12 are drilled at a diameter ratio such that the slide speed ratio of the long axis 10 and the short axis 12 is 2: 1. The test was carried out assuming two cases of rapid leakage occurring in a state where the conduit 3 was closed and a slow leak occurring when the conduit 3 was opened to supply fluid.

In the above embodiment, the solenoid valve V is a solenoid valve for a gas pipe, and rapid leakage refers to a sudden drop in internal pressure, and slow release refers to a drop in internal pressure gradually.

First, in the state in which the conduit 3 is closed, when the pressure in the conduit 3 reaches 100, the expansion and contraction membranes 8 and 9 expand to the top dead center, so that the movable magnet 14 of the long shaft 10 moves to the third lead switch ( 20, the solenoid valve V was closed for 110 seconds as is known, and then opened again when the breakage signal of the conduit 3 was not applied, and the first lead switch 17 of the short axis 12 was opened. The second lead switch 18 is placed in a state of being juxtaposed with the movable magnet 14 of FIG.

Subsequently, when the rupture of the conduit 3 was assumed and the pressure in the conduit 3 rapidly dropped to be below the minimum value, the long axis 10 and the short axis 12 were lowered and linked at the same time, but the slide speed of the long axis 10 was relatively low. Slided quickly and quickly. As a result, the valve interrupting circuit C is activated by operating the stator magnet 14 of the long shaft 10 in contact with the first lead switch 17 of the short shaft 12 before the shaft 12 is fully lowered. Was closed. Therefore, no loss of residual fluid abnormality in the conduit 3 occurred.

Next, the test was performed assuming that a gas leak occurred in the state in which the conduit 3 was opened. In this case, there are many examples of slow leakage due to the difference between the fluid supply amount and the leakage amount. Therefore, the pressure in the conduit 3 gradually decreases, which causes the movable magnet 14 of the long shaft 10 to be removed from the shaft 12. Although the valve shut-off circuit C could not be operated due to the lowering of the one-lead switch 17 at an interval L, the second lead switch 18 of the short axis 12 was closed when the minimum pressure value 50 in the conduit 3 was reached. By operating in contact with the stationary magnet 15, the solenoid valve V was closed and the contamination of the conduit 3 was alerted.

In this case, when the sum of the amount of fluid leaked through the gas cock and the amount of leakage due to external factors is equivalent to the amount of fluid supply, the fluid pressure leak detector of the present invention is not a condition that can be operated. There is almost no effect on the response of the present invention.

It is just an example of using the detector of the present invention in the above-described embodiment, the effect of the differential detection can be used in various forms without departing from the scope of the technical idea.

Claims (1)

The interior of the housing 5 is divided into the first and second detection chambers 6 and 7 and the expansion and contraction membranes 8 and 9 are provided on one side thereof, respectively, and at the tip end in the center of the expansion and contraction membrane 8. The long shaft 10 with the movable magnet 14 attached thereto is installed, and the short axis 12 with the arm 16 rolled up is provided at the front end in the center of the expansion membrane 9, and at one end of the arm 16 The first lead switch 17 operated by the movable magnet 14 of one long shaft 10 is attached, and the second lead switch operated by the fixed magnet 15 installed in the second detection chamber 7 is attached to the other end. While attaching the 18, the first and second detection chambers 6 and 7 described above are drilled and covered by the cap 19 and the cap 19, respectively. A fluid pressure leak detector formed by fixing a third lead switch (20) operated by the movable magnet (14) of the long shaft (10).