JP2006250684A - Airtightness leakage test fixture and airtightness leakage test method using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airtightness leakage test fixture which can perform an airtightness leakage test for a pipeline easily, quickly, and inexpensively only by removing partial bolts at a flange connecting part without changing the condition of the pipeline, provide a sufficient flow of a test fluid from a recessed part by effectively reducing the clogging of a communication hole of the test fixture, ensure the strength of the test fixture, and perform an airtightness leakage test even for the two pipe ends of test pipes and an airtightness leakage test method using it. <P>SOLUTION: The airtightness leakage test fixture 1 comprises a circular part 2 having the recessed part 6, two or more rib parts 3 integrated with the circular part 2, and a protrusion part 4 connected to the rib part 3. The airtightness leakage test fixture 1 is provided in the middle of the flange connecting part. Inside the circular part 2 and the rib part 3, the slit-shaped communication hole 5 is provided for connecting the recessed part 6 and the protrusion part 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an airtight leak test jig used when performing an airtight leak test on a piping line and an airtight leak test method using the same.

  Conventionally, when performing an airtight leak test on a piping line, it is almost the case that one side is fitted with a lid (eg, a lid) that blocks the flow in the pipe and the other is used as an inlet for the test medium of the airtight leak test. However, in this case, if the valve in the piping line was closed or the valve training tape was not removed, it was not possible to find a leak in the airtight leak test.

  For this reason, for example, it is conceivable to use a differential cover as an inlet for the pressure gauge. In this case, however, it is necessary to change the direction of the piping or to remove the valve on the downstream side. Leakage testing is complicated and very time consuming, and not only does the test time and cost of the test take place, but also there is a problem that the airtight leak test of equipment parts that cannot be applied to the test pressure such as a flow meter is impossible. .

  Under such circumstances, Patent Document 1 discloses that the first external measuring tube is connected to the outer end of the first communication hole provided inward from the outer periphery in the plate thickness portion of the patterned disc. The first connection hole connecting the vicinity of the inner end of the first connection hole and one side of the plate is provided, and the second external measurement tube is connected to the outer end of the second connection hole provided inward from the outer periphery. In addition, there is a second connection hole that connects the vicinity of the inner end of the second connection hole and the other side of the plate. A measurement plate is disclosed.

Further, in Patent Document 2, one end side is connected to the first gas pipe via a flange connecting portion, and the other end side is connected to the second gas pipe via a shut-off valve connected to the flange. The third gas piping is a jig for inspecting gas leakage, and is interposed between the flanges that are fixed to the end portions of the first gas piping and the third gas piping and constitute the flange connecting portion. A recess having a diameter substantially corresponding to the inner diameter of the gas pipe is formed on the surface of the shield plate facing the third gas pipe, and a recess and an outer part are formed in the peripheral edge. A gas leakage inspection jig is disclosed in which gas introduction / extraction holes that communicate with each other are formed along the radial direction.
Japanese Utility Model Publication No. 58-120947 Japanese Utility Model Publication No. 6-78840

  However, the leak measurement plate of the valve described in Patent Document 1 has a structure in which the angle formed by the first external measurement tube and the second external measurement tube is 180 degrees. Since it is necessary to remove all the bolts in the flange connection portion in order to arrange them in the middle of the flange connection portion, there is still a problem that the airtight leak test of the piping line becomes complicated.

  Moreover, since the leak measurement plate of the valve described in Patent Document 1 does not have a slit-like connection hole, there is a high possibility that clogging will occur during use, and a sufficient flow rate of the test medium can be obtained. There is no problem.

  Furthermore, since the leak measurement plate of the valve described in Patent Document 1 has the same communication hole diameter as the communication hole width, a sufficient flow rate may not be obtained, and communication holes are provided on both sides of the plate. Therefore, there is a problem that the strength of the measurement plate is inevitably insufficient.

  On the other hand, in the gas leak inspection jig described in Patent Document 2, the diameter of the recess is the same as the inner diameter of the gas pipe, so that it cannot be said that the strength of the inspection jig is sufficient. There is a problem that it cannot be used under certain circumstances, and the gas inlet / outlet holes are not slit-like, so there is a high possibility that clogging will occur during use, and there is a sufficient flow rate of the test medium. There is a problem that it cannot be obtained, and there is also a problem that the shut-off valve must be closed during the gas leak inspection.

  An object of the present invention is to perform a hermetic leak test of a pipe line simply, quickly, and inexpensively by simply removing some bolts at the flange connection without changing the state of the pipe line. At the same time, clogging in the connection hole of the test jig is effectively suppressed, a sufficient flow rate of the test medium is obtained from the recess, and the strength of the test jig is sufficiently secured, and the pipe of the test pipe is obtained. An airtight leak test jig capable of performing an airtight leak test even at the end, and an airtight leak test method using the same.

  The present inventor has made various studies in order to solve the above problems, and as a result, a circular portion having a concave portion, one or a plurality of rib portions integrated with the circular portion, and a protrusion joined to the rib portion. Airtight leakage test jig provided with a slit-shaped connecting hole for connecting the concave portion and the protruding portion inside the circular portion and the rib portion, and an airtight leakage test using the same It has been found that the method achieves the above object and has led to the present invention.

  That is, the first airtight leakage test jig of the present invention comprises a circular part having a concave part, one rib part integrated with the circular part, and a protrusion part joined to the rib part. A plate-like airtight leakage test jig interposed in the middle of the flange connecting portion, and in the inside of the circular portion and the rib portion is a slit-like connecting the concave portion and the protruding portion. A communication hole is provided.

  This feature makes it possible to easily, quickly and inexpensively perform airtight leak tests on pipe lines by simply removing some bolts at the flange connection without changing the pipe line condition. Clogging in the communication hole of the tool is also effectively suppressed, and a sufficient flow rate can be obtained from the recess.

  The second airtight leak test jig of the present invention comprises a circular portion having a concave portion, a plurality of rib portions integrated with the circular portion, and a projection portion joined to the rib portion. A plate-like airtight leakage test jig interposed in the middle of the flange connecting portion, and in the inside of the circular portion and the rib portion is a slit-like connecting the concave portion and the protruding portion. A communication hole is provided.

  With this feature, in addition to the above-described matters, more test media can be flowed than when the test medium is flowed from one rib portion, and workability of the airtight leak test can be improved. Become.

  In the airtight leakage test jig according to the present invention, the recess may be provided only on one side of the circular portion. With this configuration, the strength of the airtight leakage test jig can be improved.

  In the airtight leakage test jig according to the present invention, the concave portion has an inner diameter that is larger than a slit-like width direction length of the communication hole and smaller than an inner diameter of a pipe installed through the flange connecting portion. Can be. With this configuration, the amount of the test medium flowing from the rib portion can be increased, and the strength of the airtight leakage test jig can be sufficiently ensured.

  In the airtight leakage test jig according to the present invention, the protrusion may be formed in a cylindrical shape. With this configuration, it is easy to attach a pressure gauge or a bypass tube.

  In the airtight leakage test jig according to the present invention, the plurality of rib portions may have an angle formed by a center line in the width direction of the rib portion located at one end and a center line in the width direction of the rib portion located at the other end of 180 degrees. It can be set as the structure integrated with the said circular shaped part so that it may become less. With this configuration, even when a plurality of rib portions are provided, it is not necessary to remove all bolts at the flange connection portion that interposes the airtight leakage test jig.

  In the airtight leakage test jig according to the present invention, the circular portion, the rib portion, and the protruding portion may be formed by integral molding. With this configuration, it is possible to manufacture an airtight leakage test jig even when chemical resistance is required or resin is selected as the material according to price measures.

  In the airtight leakage test jig of the present invention, the circular portion and the rib portion can be formed by bonding two plate-like bodies together. With this configuration, combinations of materials that satisfy the mechanical performance are expanded.

  The airtight leak test method of the present invention is an airtight leak test method using the airtight leak test jig.

  By using the airtight leak test jig of the present invention, the airtight leak test from the most upstream to the most downstream of the piping line can be performed by removing only some bolts at the flange connection without changing the state of the piping line. Therefore, the airtight leak test of the piping line is simplified, and the airtight leak test of the piping line can be performed in a shorter time than before, thereby reducing the cost of the airtight leak test of the piping line. Contribute.

  When the airtight leakage test jig of the present invention is used, the effect described above is exhibited because the number of installation locations of the airtight leakage test jig can be reduced as compared to the conventional method as the piping line becomes more complicated. Will be.

  By using the jig for the airtight leak test of the present invention, it is possible to perform the airtight test by installing a jig between the flanges of the already installed flange joints. Since the number of parts to be assembled is reduced, there is no risk of leakage that occurs when the part temporarily assembled in the airtight leak test is returned to the original position, and the number of leaked parts in the pipe can be significantly reduced.

  In the airtight leakage test jig of the present invention, clogging in the communication hole of the test jig is effectively suppressed, and a sufficient flow rate can be obtained from the recess.

  The hermetic leak test jig of the present invention has sufficient strength of the test jig, and no noticeable deformation is observed even when pressed.

  By using the airtight leak test jig of the present invention, the airtight leak test is possible even between the ends of the test pipe because the space for installing the jig only needs the volume of the jig itself. Can also be done.

  Hereinafter, the present invention will be described in more detail. First, an embodiment of a first airtight leakage test jig in the present invention will be described.

  In FIG. 1, an airtight leakage inspection jig 1 includes a plate-like circular portion 2, a plate-like rib portion 3, and a cylindrical projection portion 4. The circular part 2 and the rib part 3 are in an integrated state. The thinner the circular part 2 and the rib part 3 are, the easier it is to be inserted in the middle of the flange connection part, which is advantageous in terms of manufacturing cost, but inversely proportional to the performance such as flow rate and strength of the test medium. Therefore, when balancing workability, production cost, and performance, it is considered that about 3 mm to about 10 mm is preferable. In addition, when the test pressure is high or the material is resin, the thickness of the circular portion 2 and the rib portion 3 should be thicker than about 10 mm, but with the advent of new materials in the future, it will be thinner and lighter, There is also the possibility of being cheap.

  The circular part 2 is a part interposed in the middle of the flange connection part. As described above, since the thickness of the circular portion 2 is very thin, the airtight leakage test jig of the present invention does not change the state of the piping line and only removes some bolts at the flange connection portion. Thus, the airtight leakage inspection jig can be interposed in the flange connection portion.

  A concave portion 6 is provided in the central portion on one side of the circular portion 2. In the present invention, the inner diameter of the recess 6 may be the same as or different from the length of the slit-like width direction in the communication hole 5, but is larger than the length of the slit-like width direction of the communication hole 5, It is preferable that it is smaller than the inner diameter of the pipe installed through the flange connection portion. This is because the larger the inner diameter of the recess 6 is, the better the inflow efficiency of the test medium is, but conversely, the strength of the jig is impaired. In addition, from the point of exhibiting the effect of the present invention more, the inner diameter of the concave portion 6 in the present invention is 2 to 5 when the length of the slit-like width direction in the connecting hole 5 is 1, preferable. For example, when the outer diameter of the circular portion 2 is 190 mm, the inner diameter of the recess 6 is preferably 40 mm, and the length in the width direction of the slit is preferably 10 mm.

  The rib portion 3 has a rectangular shape, and when the circular portion 2 is interposed in the middle of the flange connection portion, the rib portion 3 protrudes from the flange connection portion. Although various values can be adopted for the length in the width direction of the rib portion 3 depending on the standard size, the product packaging management, manufacturing simplification, product manufacturing cost reduction, product performance inspection Therefore, it is preferable to unify the parts that can be unified, rather than a mixture of various values.

  Inside the circular portion 2 and the rib portion 3, there is provided a slit-like communication hole 5 that connects the concave portion 6 in the circular portion 2 and the protruding portion 4 joined to the rib portion 3. From the viewpoint of work efficiency, the thinner the circular portion 2 and the rib portion 3 of the airtight leakage test jig 1, the better, but the plate-like circular portion 2 and the rib portion 3 are provided with connecting holes 5. At this time, since the hole itself becomes small, it is necessary to give the hole a width in order to improve the inflow efficiency of the test medium. Although it is one method to provide a lot of small holes here, there is concern from the production cost of the product, and it is also imagined that small holes are likely to clog foreign substances that may be mixed in the test medium. Is done. Therefore, as a result of these considerations, in the present invention, the communication hole 5 that connects the concave portion 6 in the circular portion 2 and the protruding portion 4 joined to the rib portion 3 is a wide hole, that is, a slit shape. did.

  In order to secure the flow rate of the test medium as much as possible, it is preferable to take as long as possible with the determined length in the width direction of the rib portion 3, but by laminating two plate-like bodies together When forming the circular part 2 and the rib part 3, the welding margin and joining margin for joining each other are needed. As a joining margin, a joining margin of about 10 mm is required for the circumferential welding process and the crimping joining process, and therefore the length in the width direction of the slit-like connecting hole 5 is about 10 mm. In order to promote the inflow of the test medium from the slit-like communication hole 5, it is preferable to increase the inner diameter of the recess 6 in the exit portion of the test medium, that is, the circular portion 2.

  The protruding portion 4 is joined to the rib portion 3. The protrusion 4 may be erected on the plate-like plane of the rib portion 3 as shown in FIG. 2, or may be erected on the tip side surface of the rib portion 3 as shown in FIG. 3. The protrusion 4 is processed so that a pressure gauge or a bypass tube can be attached, and the test medium can be taken out or extracted from the protrusion.

  In the airtight leakage test jig of the present invention, as shown in FIG. 2, the circular portion 2 and the rib portion 3 may be formed by bonding two plate-like bodies together, as shown in FIG. Alternatively, the circular portion 2, the rib portion 3, and the protruding portion 4 may be formed by integral molding.

  As shown in FIG. 2, examples of the material in the case where the circular portion 2 and the rib portion 3 are formed by bonding two plate-like bodies together include, for example, various SS steel materials, various SUS steel materials, and brass (brazing process). ) And the like, and general commercially available metal species that can be welded or brazed.

  Here, the method of bonding the two plate-like bodies is not particularly limited as long as the mechanical strength of the airtight leakage inspection jig is satisfied. For example, laser welding, pressure bonding, use of an adhesive, brazing, and the like. Processing, mechanical combination joining processing, etc. can be illustrated.

  As shown in FIG. 3, the material in the case where the circular portion 2, the rib portion 3, and the protruding portion 4 are formed by integral molding, for example, fiber reinforced resin (FRP), reinforced plastic, and polyvinyl chloride (PVC) resin. Resins such as, metals (castings) such as aluminum, and nonmetals such as ceramics.

  The hermetic leak test jig of the present invention can be used for both a gas hermetic leak test and a liquid hermetic leak test.

  When the circular portion of the airtight leakage test jig of the present invention is interposed between the flanges in the flange connection portion, the piping line becomes a closed space. Therefore, for example, the airtight leakage test jig of the present invention is interposed in each of the flange connection portions of the inlet and outlet of the piping line to be subjected to the airtight leakage test, and the test medium is introduced from the protruding portion, and then left to stand. By doing so, an airtight leak test can be carried out.

  In addition, the airtight leak test jig of the present invention is provided in two airtight leak test jigs, which are interposed in the flange connection portions on both sides of the portion where the airtight leak test such as a flow meter cannot be performed. By connecting the protrusions with a bypass tube, a bypass line is created, so there is no need to remove the flow meter and provisional piping, so leakage that occurs when the part temporarily assembled in the airtight leakage test is restored. The danger of disappearing.

  Next, an embodiment of the second airtight leakage test jig in the present invention will be described. In addition, description is abbreviate | omitted about the matter similar to the 1st airtight leak test jig | tool mentioned above.

  4, the airtight leakage inspection jig 11 includes a plate-like circular portion 12, a plurality of plate-like rib portions 13a, 13b, 13c, and 13d, and a plurality of plate-like rib portions 13a, 13b, and 13c. , 13d and cylindrical projections 14a, 14b, 14c, 14d.

  The circular portion 12 and the plurality of rib portions 13a, 13b, 13c, and 13d are in an integrated state. The angle formed by the center line in the width direction of the rib portion 13a located at one end and the center line in the width direction of the rib portion 13d located at the other end is about 135 degrees and less than 180 degrees. By simply removing some of the bolts 18 a, 18 b and 18 c, the airtight leakage inspection jig 11 can be interposed in the flange connection portion 17.

  The recess 16 is provided only in the central portion on one side of the circular portion 12. Inside the circular portion 12 and the rib portions 13a, 13b, 13c, 13d in each direction, slit-shaped connecting holes 15a, 15b, 15c for connecting the concave portion 16 and the protruding portions 14a, 14b, 14c, 14d, 15d is provided.

  When the inflow amount of the test medium from the rib portions 13a, 13b, 13c, 13d in each direction is increased, the test medium flowing from the rib portions 13a, 13b, 13c, 13d in each direction Since interference is caused by the recess 16 provided in the center, the inner diameter of the recess 16 is larger than that of the single rib portion 3. However, as described above, since the strength of the jig decreases as the inner diameter of the recess 16 increases, the inner diameter of the recess 16 must be determined so as not to fall below the required strength.

  For example, by setting the inner diameter of the concave portion 16 where the test media from the rib portions 13a, 13b, 13c, and 13d in each direction merge to about 40 mm, the test from the rib portions 13a, 13b, 13c, and 13d in each direction is performed. The inflow of the medium can be performed smoothly.

  An example of the procedure of the airtight leak test performed using the airtight leak test jig of the present invention will be described below.

  First, after the construction of the piping work is completed, the airtight leakage test jig of the present invention is installed at the equipment coupling flange joint on the most upstream side of the piping line, and the equipment coupling flange joining on the most downstream side of the piping line. The airtight leakage test jig of the present invention is also installed in the section. If there is a device or measuring instrument that cannot apply test pressure in the piping line, attach the airtight leakage test jig of the present invention to each flange joint on the upstream side and downstream side of the device. Connect the protrusion of the jig with a bypass tube to provide a bypass for the device of the airtight test medium.

  Next, a pressure indicator is attached to the protrusion of the airtight leak test jig attached to the most downstream side of the piping line, and then the airtight test is applied to the protrusion of the confidential leak test jig attached to the uppermost stream side of the piping line. The medium is introduced and pressurized to the test pressure. After confirming that the pressure inside the pipe has been increased to the test pressure, check the pressure indicator attached to the most downstream side, and then close the valve installed in advance at the test medium inlet to adjust the pressure inside the pipe line. Hold.

  Here, when there is a leak location in the piping line, the value of the pressure indicator changes, so that the leak location can be confirmed.

  If there is no leakage problem in the piping line, take out the airtight test medium from the security leak test jig installed on the most downstream side, then remove the security leak test jig attached to each location and tighten the flange joint. Confirm and complete a series of security leak testing.

It is the schematic which shows one Embodiment in the jig | tool for the 1st airtight leak test of this invention, (a) shows the state of a front, (b) shows the state of the right side. It is a schematic perspective view explaining an example of the manufacturing process of other one Embodiment in the jig | tool for a 1st airtight leak test of this invention. It is a schematic perspective view which shows other one Embodiment in the jig | tool for a 1st airtight leak test of this invention. It is a schematic front view which shows one Embodiment in the 2nd jig | tool for an airtight leak test of this invention.

Explanation of symbols

1,11 Airtight leakage inspection jig 2,12 Circular portion 2a Upper circular portion 2b Lower circular portion 3, 13a, 13b, 13c, 13d Rib portion 3a Upper rib portion 3b Lower rib portion 4, 14a, 14b, 14c, 14d Protrusion 5, 15a, 15b, 15c, 15d Connection hole 6, 16 Recess 17 Flange connection 18a, 18b, 18c Bolt

Claims (9)

A plate-like airtight leak comprising a circular part having a concave part, a single rib part integrated with the circular part, and a projection part joined to the rib part, interposed between flange connection parts A test jig,
An airtight leakage test jig characterized in that a slit-shaped connecting hole for connecting the concave portion and the protruding portion is provided inside the circular portion and the rib portion. A plate-like airtight leak comprising a circular part having a concave part, a plurality of rib parts integrated with the circular part, and a projection part joined to the rib part, interposed between flange connection parts A test jig,
An airtight leakage test jig characterized in that a slit-shaped connecting hole for connecting the concave portion and the protruding portion is provided inside the circular portion and the rib portion. 3. The airtight leak test jig according to claim 1, wherein the concave portion is provided only on one side of the circular portion. The inner diameter of the recess is larger than a slit-like width in the communication hole and smaller than an inner diameter of a pipe installed through the flange connecting portion. An airtight leakage test jig according to one item. The airtight leakage test jig according to any one of claims 1 to 4, wherein the protrusion is cylindrical. The plurality of rib portions are formed on the circular portion so that an angle formed by a center line in the width direction of the rib portion located at one end and a center line in the width direction of the rib portion located at the other end is less than 180 degrees. The airtight leakage test jig according to any one of claims 2 to 5, wherein the jig is integrated. The airtight leakage test jig according to any one of claims 1 to 6, wherein the circular portion, the rib portion, and the projection portion are formed by integral molding. . The airtight leak test according to any one of claims 1 to 6, wherein the circular portion and the rib portion are formed by bonding two plate-like bodies together. jig. An airtight leak test method using the airtight leak test jig according to any one of claims 1 to 8.

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