JPS6153539A - Apparatus for measuring leakage amount of gas - Google Patents

Abstract

PURPOSE:To know the gas leakage amount of a specimen itself by detecting the leakage amount of gas, by a method wherein a specimen is placed and fixed in a hermetically sealed space and a pressure detector is connected to the hermetically sealed space while the sealed gas with predetermined pressure is applied to the under surface of the specimen from one side of said space to bring the other upper surface of said specimen into communication with the atmosphere. CONSTITUTION:The bottom surface of a press jig 48 is contacted with the upper surface of a handle 94. Air or nitrogen gas is supplied into a chamber 45 from a pressure fluid introducing pipeline 16 through a passage 32a so as to adjust the pressure in the chamber 45 to predetermined one. The gas fills the passage 32b from the space between the surface of the specimen 100 and the surface demarcating the recessed part 34 of a lower press member 30 and the valve 15 interposed to the pipeline 16 is closed. Said gas reaches the interface part of a code member 104 and a coating member 102a through a window part 106a and reaches the window part 106b at last through said interface part or code member. The gas reaches a chamber 54 through the gas passage 56 provided to the press jig 48 by engraving and leaked to the outside through a gas passage 52. The reduction in pressure detected at the detection part provided to the pipeline 17 is confirmed with the elapse of time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas leakage measuring device, and more particularly, the present invention relates to a gas leakage measurement device, and more particularly, a sample made of a composite material formed to prevent the passage of fluid in a normal state is held in an airtight state, and a predetermined Song of a small amount of fluid passing through the composite material by applying pressure of /!
! The present invention relates to a gas leakage measuring device configured to measure feet.

BACKGROUND ART Various sealing members are generally used when a gas such as air or gas is sealed in a closed space and the gas is intended to perform a predetermined function without leaking to the outside.

In this case, the sealing member may be made of a material with excellent elasticity and flexibility, such as natural rubber or synthetic rubber, or may be made of corded material to avoid damage from bending or impact and maintain a specified strength. A fibrous member of the form may be included as a reinforcing material.

FIG. 1 shows an example of this type of sealing member that has been widely used in the past. That is, thin twisted fibrous members 4 are arranged between the rubber members 2a and 2b in parallel, or in some cases in a laminated manner, thereby ensuring a predetermined strength. However, with such a structure of the sealing member, when the gas pressure in the sealed space 6 closed by the sealing member is generally large, the rubber substance forming the rubber member 2a, albeit in a small amount, will leak. and reaches the fibrous member 4. As a result, a space is created at the interface between the rubber member 2a and the fibrous material member 4, or the permeation is promoted through the inside of the fibrous member (for this reason, the rubber member 2a
This causes a peeling phenomenon of the fibrous member 4, and a similar interfacial peeling phenomenon occurs between the fibrous member 4 and the rubber member 2b due to the leaked gas. This means that if repeated strain is applied, the sealing member itself will break quickly within 1υ1, leading to problems such as deterioration of durability.

Therefore, it is recommended to take a piece of this type of sealing member as a sample in advance, supply a predetermined pressure fluid to the sample in a sealed space, and measure how much gas leaks from this sample. For example, when using this type of composite material,
It is clear that by setting the usage conditions, durability can be improved and damage accidents can be avoided.

Therefore, the present inventors focused on the above points, and as a result of intensive research and efforts to obtain a measuring device that can accurately and quickly measure the leakage of trace amounts of gas, the present inventors placed the sample in a sealed space. If the sample is fixed and a pressure detection device is connected to the sealed space, and a sealed gas at a predetermined pressure is applied to the lower surface of the sample from one side of the space, and the other upper surface is communicated with the atmosphere, the sealed gas can be detected. leaks over time from one side of the pressurized sample to the other side, and as a result, when there is a gas leak, the detection device detects a slight pressure decrease variation from the initially applied gas pressure. In this way, each time the amount of gas leaked from the sample is measured, the amount of gas leaked from the sample itself can be measured, and information such as the properties of the composite 1A related to the sample can be obtained. Judgment IL regarding the setting of usage conditions, durability, suitability of quality, etc.
J'i standard 11th U was obtained, and it was found that the various inconveniences mentioned above could be solved.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a gas leakage measuring device which has an hour wheel configuration, is easy to handle, and is capable of accurately and quickly measuring the amount of gas leaking from a composite material.

In order to achieve the above object, the present invention includes a sample holding part;
a pressure detection section including a piezoelectric transducer that detects the pressure fluctuation of the gas in the sample holding section and converts it into an electrical signal;
and a recording display section for recording and/or displaying J+ (
Jiif, the sample holding section has a first pressing member and a second pressing member, and the first pressing member and the second pressing section 1.
When joining 2111 and 2111, the sample is fixed at the joint of these pressing members, and a space defining a chamber is formed, and the space is provided with a passage for pressurized gas and a vent for escaping 2111 leaked gas to the atmosphere. The passages are connected in communication, the sample is arranged so as to close the pressurized gas passage and the ventilation passage, and the pressure fluctuation of the gas sealed in the space is detected by the detector, thereby detecting the sample at a predetermined gas pressure. It is characterized by being configured to measure the amount of gas leakage or the degree of gas leakage.

Next, preferred embodiments of the gas leak measuring device according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 2, reference numeral 10 indicates a gas leakage measuring device according to the present invention, and this gas leakage measuring device 10 basically comprises a sample mounting section 11, a detecting section 12, and a record display section 13. . The detection section 12 includes a piezoelectric transducer, and the output side of this piezoelectric transducer is connected to the recording/display section 13 . The sample mounting section 11 has a sample fixing section 14 , and a pressure fluid introduction conduit 16 with a valve device 15 interposed therein is connected to the sample fixing section 14 . On the other hand, the sample fixing section 14 is connected to a detection section 12 via a pressure fluid detection conduit 17, and this detection section 12 converts a change in gas pressure caused by the sample, which will be described later, into an electrical signal, which is then recorded in the It is sent to the display section 13. The record/display section 13 includes an A/D converter therein, and converts the analog signal related to the pressure change of the gas detected by the detection section 12 into a digital signal, and displays the digital signal on the display section 13 or a printer (not shown). It is also possible to dedicate the output to someone else and record it.

Now, the sample mounting section 11 will be explained in detail. As shown in FIG. 3, the sample mounting section 11 includes a base 20 and a support member 22 extending parallel and upward from the base 20.
a, 22b. An upper plate body 24 for holding an upper suppressing member to be described later is fixed to the upper end portions of the support members 22a and 22b, and a boss-shaped support body 25 is fitted approximately at the center of this upper plate body 24. Fixed. That is, a hole is formed in the upper plate 24, and a support 25 is placed in this hole by 11.times.
5a to connect the upper plate body 24 and the support body 25.

In this case, the support body 25 is previously provided with an internal thread.

On the other hand, the supporting members 22a and 22b are triangular prism-shaped reinforcing portions extending vertically from the base 20. .

This means that the positioning of both i'α is sufficiently maintained.

Therefore, inside the space 28 defined by the base 20, the support members 22a, 22b, and the upper plate 24, there are a first pressing member, that is, an upper pressing member, and a second pressing member.
That is, the lower pressing member is arranged in the vertical direction. As shown in FIG. 4, the lower pressing member 30, which is partially fitted and fixed to the four parts formed on the base 20, has a set of pressurized gas passages extending in the horizontal direction, that is, as shown in FIG. A four section 34 is defined at the upper end of the cylinder, including a pressurized gas introduction passage 32a and a pressurized gas pressure fluctuation detection passage 32b.

The pressurized gas introduction passage 32a and the pressurized gas pressure fluctuation detection passage 32b are substantially connected to the pressure fluid four-person conduit 16 and the pressure fluid detection conduit 17, respectively. It extends horizontally to approximately the center, and then bends upward in the vertical direction to communicate with the recess 34 . Said part 3
4, a first protrusion 36 that circulates and a second protrusion 38 are formed concentrically with the first protrusion 36 and protrude outside of the first protrusion 36, and the first protrusion 36 and the second protrusion 38 are connected to each other. A seal ring 40 is fitted between them (see FIG. 5). In addition, the second protrusion 3
A groove 44 is also defined between the lower pressing member 8 and an edge 42 that goes around the outer peripheral edge of the lower pressing member 30 .

In this way, a circular filter portion 46 is placed and fixed in the chamber 45 defined by the first protrusion 36 .

The filter member 4G may be a fine mesh-like member or a nonwoven fabric.

Next, a holding jig 48 is fitted onto the filter member 46 disposed on the four parts 34. The holding jig 48 has a disk shape, and has a circumferential protrusion 50 formed on its upper surface, and a part of the protrusion 50 is cut out to form a ventilation passage 52 that communicates leaked gas with the atmosphere. . Therefore, [1
It will be easily understood that the chamber 54 is defined in the center portion of the presser jig 48 by the circumferential protrusion 50. Therefore, a plurality of aligned ventilation passages 56 extending vertically inside the chamber 54 are formed in this holding jig 48 . The ventilation passage 56 communicates the chamber 54 with the chamber 45 defined by the first protrusion 36 when the presser jig 48 is fitted into the recess 3.1. Regarding the holding jig 48, reference numeral 58 indicates a hole into which a bolt, which will be described later, is screwed.

Therefore, the sample is placed so as to close the space between the pressurized gas passages 32a, 32b and the ventilation passages 5G, 52, and the pressurized gas passes through the sample from the sealed side, passes through the ventilation passage, and enters the atmosphere. As a result, a decrease in the pressure of the sealing gas will be detected over time.

Further, an upper pressing member 62 is attached to the upper part of the holding jig 48 configured as described above.

The upper pressing member 62 has a plurality of holes 64 corresponding to the holes 58 on its periphery, and a bulge 66 that projects upward in the vertical direction is formed in the center thereof. A recess 68 is defined in the center of the bulge 66, and the four parts 68 are wide-diameter circumferential grooves 7 into which a washer 70 is fitted.
2 and an internal screw 74 located above the circumferential groove 72. In this way [11! The upper pressing member 62 made of
Insert bolt 7G into the hole 64 and tighten this bolt 7G.
The distal end of the upper pressing member is screwed into the hole 58 of the holding jig 48, and the upper pressing member and the holding jig 48 are integrally engaged.

Next, a rod 78 is fitted into the hole 68 of the upper pressing member 62 for vertically displacing the upper pressing member 62 and the holding jig 48 together.

As can be easily understood from FIG. 4, the long door 8 has a flange 80 at its lower portion, while its upper end is configured as a prismatic portion 84. A screw 86 is formed between the flange 80 and the square column part 84. That is, the flange 80 is inserted into the hole 68 of the two-part pressing member 62.
k! Then, the upper pressing member 62 and the rod 78 are integrated by fitting the washer 70 into the rotation/lly 72. On the other hand, a screw member 88 that is screwed into the inner screw 74 is attached to a portion of the washer 70, which prevents the washer 70 from being disengaged and rotatably holds the rotor l'713. That is, in this case, the cylindrical inner wall portion 9 of the screw member 88
0 engages with the smooth surface portion 92 located directly above the flange 80 of the same 1 throat 78, and is therefore rotatable.

Essentially, after the upper pressing member G2 is integrally engaged with the holding jig 48 via the bolt 76, the opening/second door 8 is placed inside the hole 68, and the washer 70 is inserted into the front door 8. The rod 78, the upper pressing member 62) and the pressing jig 48 are integrated by fitting the rod 78 into the square column 84 and releasing the washer 70. Then, the screw member 88 is dropped from the square column portion 84 and engaged with the inner screw 74 of the upper suppressing member 62.

Therefore, the rod 78, the upper pressing member 62) and the holding jig 48 integrated in this way are put into the space 28, and further displaced in the direction of the upper plate 24, and the support 25 fixed to the upper plate 24 is moved. A screw 86 is screwed into the internal thread of the handle 94, and the handle 94 is engaged with the prismatic portion 84 whose head is exposed. That is, the handle 9/1 has a main body 98 in which a square hole 96 is formed in the center thereof, and arm members 99a and 99b extending from the main body 98 in horizontal directions opposite to each other.
This handle 94 and the rod 78 are integrated by fitting into the prismatic portion 84 of the rod 78. As will be described later, the handle 94 and the rod 78 are used to move the upper pressing member 62) presser jig 48 up and down, and for this purpose, they can be replaced with an air cylinder or a hydraulic cylinder, for example. Of course there is.

The gas leakage measuring device according to the present invention is ultimately constructed as described above, and its operation and effects will be explained next.

First, a sample must be prepared in order to measure the amount of gas leakage. Therefore, a sample suitable for this measuring device is shown in FIG. Of course, this sample 100 is a coating member 102a made of rubber or the like.

102b and Kono coating members 102a, 102b
) A cord member 104 made of a fibrous material sandwiched between
including. A portion of the coating member LO2a constitutes a cutout window portion 106a, and a portion of the coating member 102b serves as a cutout window portion 106b as described above. In this case, the sample 100 is preferably placed in a circular shape so as to be placed inside the four parts 34.

Therefore, the sample loo configured as described above is placed in the window section 10.
The filter member 4G is placed on the filter member 4G fixed inside the recess 34 with the window 106b positioned at the bottom and the window 106b at the top. As a result, the window portion 10a faces the gas passage 32a. In such a state G, if the handle 94 is rotated, the handle 94 will turn.
The iron door 8, which is integrally formed with the support member 25, is displaced downward to engage with the inner screw formed inside the support member 25, and as a result, the upper pressing member 62) and the setting jig 4B are also integrally displaced downward. Displaced to. That is, since the surface portion 92 slides on the inner wall portion 90 of the screw member 8B by rotation of the handle 94, the upper pressing member 56G can be lowered without particularly rotating the upper pressing member 66.

Therefore, the bottom surface of the holding jig 48 comes into pressure contact with the top surface of the sample 100.

Therefore, in such a state, air or nitrogen gas is fed into the chamber 45 through the gas passage 32a from the pressure fluid introduction pipe 16 to a predetermined pressure. The gas that has reached the inside of the chamber 45 is filled into the passage 32b from between the surface of the sample 100 and the surface defining the recess 34 of the lower pressing member 30. As a result, the detection section 12 detects the pressure and records and displays it on the record display section 13.

When the detection unit I2 detects a predetermined pressure, the pipe line 1
Valve 15 interposed in 6 is closed. Therefore, a constant pressure value is displayed as is on the record display section 13. Therefore, if the pressure sealed in the gas passage 32; . However, in reality, sample 1
00 is applied to the gas passages 32a and 32b, the gas reaches the interface between the cord member 104 and the coating member 102a through the window 106a,
It finally reaches the window portion 106b via this interface portion or inside the cord member. Therefore, the gas that has reached this window], 06b reaches the chamber 54 via the ventilation passage 56 carved in the holding jig 48, and from this chamber 54, the gas reaches the ventilation passage 5.
2 to the outside. In other words, since the pressure of the fluid applied to the pressure gas passages 32a and 32b leaks to the outside via the ventilation passages 56 and 52, the decrease in pressure detected at the detection part I2 is This will be confirmed over time. Since the record display unit 13 digitally displays this reduced pressure value on the display unit, the measuring person who monitors this display unit can
00 can easily check how much gas has leaked within a predetermined period of time.In order to remove the sample 100, rotate the handle 94 in the opposite direction and hold down the upper pressing member 66. This is done by raising it integrally with the tool 48.

As is clear from the above, if the leakage fluid is measured around the time axis, it can be easily confirmed whether the sample has the desired quality. In addition, 1i
The filter section 46 described in ii. effectively removes dust, etc., if present in the gas introduced from the gas passage 32a, and also has the effect of further improving the accuracy of pressure measurement.

According to the present invention, as described above, it is possible to easily measure the amount or degree of leakage of gas generated from the interface of a sample made of a composite material, and the handling thereof is also simple. I, Ii' of gas flowing through
The information +μ to prevent I leakage is suspended, and the quality 4' (C
It is possible to provide extremely effective materials for verification. In particular, since the device of the present invention can measure the amount of leaked gas that has passed only through the interface of the composite material, the true degree of leakage of the sample can be determined, and the value can also be calculated by determining whether the gas is sufficiently sealed by a jig, etc. It also has the advantage of being extremely reliable because it is guaranteed to be reliable.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments. It goes without saying that various improvements and design changes can be made without departing from the gist of the present invention, such as the same effects can be obtained by defining a path for leading the leaked gas to the entire gas section. be.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a state in which pressure fluid leaks from the interface of the composite material to the other side when a predetermined pressure is applied to a sample consisting of a coating member and a coating member, and FIG. An explanatory diagram showing a schematic configuration of such a gas leakage amount measuring device, FIG. 3 is a partially cutaway perspective view of the three parts (1'4') constituting the gas leakage amount/11ll determination device of the present invention,
Figure 4 is an exploded perspective view of the sample mount shown in Figure 3 with the base, support member, and upper plate removed, and Figure 5 is the base, support, and upper plate of the sample holder shown in Figure 3. FIG. 6 is a vertical cross-sectional explanatory view showing the combined state of the upper pressing member and the lower suppressing member, and FIG. 10... Equipment 11... Number of samples (1 part 12...
- Detection unit 13... Record display unit 14... Sample fixing unit 15... Valve device 16... Pressure fluid introduction pipeline 20... Bases 22a, 22b... Support member 24... Upper plate body 25... Support body 25a... Bolt 26... Reinforcement member 28... Space 30... Lower suppression member 32a
...Passage 32b for pressurized gas introduction...Passage 34 for detecting pressurized gas pressure fluctuations...Concavity 36.38...Protrusion 40...
Seal ring 42...Edge 44...Groove 4
5... Chamber 46... Filter member 48... Holding jig 50... Projection 52... Ventilation passage 54... Chamber 56... Ventilation passage 58... Hole 62... Upper pressing member 64... Hole 66...Kakudebu 68
... Recessed portion 70 ... Washer 72 ... Circumferential groove 74
・・Inner screw 76・・Bolt 78・・Rod
80...Flange 84...Prismatic portion 8
6. Screw 88.. Screw member 90.. Inner wall portion 9
4... Handle 96... Square hole 98... Main body 99a, 99b... Arm member 100... Sample

Claims (4)

[Claims] (1) A sample holding section, a pressure detecting section including a piezoelectric transducer that detects the pressure fluctuation of the gas in the sample holding section and converting it into an electrical signal, and a pressure detecting section that is connected to the output side of this pressure detecting section and a record/display unit that records and/or displays pressure fluctuations, the sample holding unit has a first pressing member and a second pressing member, and the first pressing member and the second pressing member When joining the press members, a sample is fixed at the joint of these pressing members, and a space defining a chamber is formed, and a passage for pressurized gas and a ventilation passage for escaping leaked gas to the atmosphere are communicated with the space. gas leakage of the sample at a predetermined gas pressure by arranging the sample so as to close the pressurized gas passage and the ventilation passage, and detecting the pressure fluctuation of the gas sealed in the space with the detector. 1. A gas leak amount measuring device, characterized in that it is configured to measure the amount or degree of gas leakage. (2) In the device according to claim 1, the gas passage includes a gas introduction passage and a gas pressure fluctuation detection passage, and the gas introduction passage introduces the gas under a predetermined pressure via a valve device. A gas leak amount measuring device is connected to a pressure gas supply source, and the gas pressure fluctuation detection passage is connected in communication with a pressure detection section. (3) A gas leakage measuring device according to claim 1 or 2, wherein the pressing member is provided with a holding jig for holding a sample, and the jig is provided with a ventilation passage. (4) The gas leak amount measuring device according to claim 3, wherein the holding jig has a ventilation passage communicating the space with the atmosphere.