JP2016044983A - Pressure testing method for test specimens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable, when a test specimen from which a test medium leaks is to be tested for pressure test-proof performance, an inner bag under pressure from the test medium to be prevented from breakage.SOLUTION: In order to make fluid 12 usable as a test medium leaking from a cloth bag 1, which is a test specimen, a pressure-resistant inner bag 10 that does not allow the fluid 12 to leak is used. The inner bag 10, made of a thin film-like material, is enabled to inflate and contract. Inside the inlet cylindrical part 3 of the cloth bag 1, an inner bag breakage preventing pipe 13 is arranged, and the inner bag 10 is put into the cloth bag 1 through the inner bag breakage preventing pipe 13. In this way, when the inner bag 10 is put into the cloth bag 1 and when it is inflated in the cloth bag 1, no breakage is allowed to occur.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure test method for a device under test that performs a pressure test of a device under test that leaks when a fluid such as air or water is used as a test medium.

  The pressure resistance test of the device under test is performed by injecting a test medium inside the device under test and applying pressure.

  When the device under test is a cloth bag that leaks a fluid such as air or water, or a container with a gap, a pressure test using such a fluid as a test medium cannot be performed.

  In such a case, a test medium other than the fluid, for example, a fluid such as earth and sand, is packed in the body to be tested to apply pressure, but it is difficult to apply pressure to the body to be tested.

  Therefore, in the pressure resistance test of the device under test, it has been conventionally performed to use a fluid as a test medium.

  As an example of a pressure test method when a conventional fluid is used as a test medium and the device under test leaks a fluid, there is a pressure vessel test method.

  In the pressure test performed by this pressure vessel test method, a liquid-impervious bag-like member capable of withstanding the test pressure is accommodated in the pressure vessel from the opening of the pressure vessel, and a protrusion having the opening of the bag-like member is provided. The cover from which the portion is led out is attached to the opening of the pressure vessel, and liquid is injected into the bag-like member from the opening of the bag-like member to apply the test pressure (see, for example, Patent Document 1).

  However, what is described in Patent Document 1 is that in a pressure test of a pressure vessel, after a bag-like member is stored in the pressure vessel from the opening, the protruding portion having the opening is led out from the cover attached to the opening of the pressure vessel. However, it is not intended to prevent breakage of the protruding portion having the opening of the bag-like member.

  As another example, in a pressure test of a motor case, a rubber bag is formed inside the motor case, and pressure is applied from the inside of the motor case by supplying water into the rubber bag under pressure. There has also been a proposal (for example, see Patent Document 2).

  However, the one described in Patent Document 2 is a rubber bag formed by integrally forming a rubber layer on a peeling film inside a motor case, and the rubber bag is reduced and inserted into the motor case. It does not inflate.

  Moreover, the one described in Patent Document 2 has no idea of preventing the rubber bag from being damaged when the rubber bag is inserted into the motor case and inflated.

JP 58-153136 A JP-A-6-249071

  Therefore, the present invention enables a pressure test using a fluid as a test medium in a pressure test of a device under test in which a fluid leaks, and can prevent damage to a pressure resistant inner bag placed in the sample under test. An object of the present invention is to provide a pressure resistance test method for a test object.

  In order to solve the above-mentioned problems, the present invention connects an end of an inlet tube portion into which a test medium can be poured into a test subject that leaks the test medium to form a corner portion, and the inlet tube portion of the test subject One end portion of the inner bag breakage prevention tube inserted into the inner bag protrudes to the inner side of the corner portion, and is inserted into the test object through the inner side of the inner bag breakage prevention tube. The inner bag is inflated by pressurizing with the test medium, and pressure is applied to the body under test to perform a pressure test of the body under test.

  In the above configuration, the inner bag for injecting the test medium is a thin film material, and is put into the test body through the inner bag breakage prevention tube so as to be inflated. In the method, the inner bag for injecting the test medium is further inflated from one end of the inner bag breakage prevention tube by the test medium injected through the injection port located in the inner bag breakage prevention tube. The pressure test method for the DUT is used.

According to the pressure resistance test method for a device under test of the present invention, the following excellent effects are exhibited.
(1) When the inner bag to be inflated by injecting the test medium is put into the test object, the inside of the inner bag breakage prevention tube is passed as a guide, so when the inner bag is put into the test object, the inner bag Will not be damaged.
(2) When the inner bag placed in the DUT is inflated by pressurizing by injecting the test medium, it is inflated along one end of the inner bag breakage prevention tube. Interference between the corner portion and the inner bag can be avoided, and damage can be prevented.

It is a schematic diagram showing one embodiment of the present invention. There is a schematic diagram showing a state in which a pressure test of a device under test is performed from the state of FIG. (A) is the enlarged view of the A section of FIG. 1, (b) is the enlarged view of the B section of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIGS. 1 to 3 (a) and 3 (b) show an embodiment of a pressure test method for a device under test according to the present invention. A cloth bag (hereinafter referred to as a cloth bag) having a pressure strength but leaking fluid 12 as a test medium. This shows the case where a pressure resistance test is performed using 1 as a test object.

  According to the pressure resistance test method of the test object of the present invention, an indirect pressure test of the cloth bag 1 is performed by placing the inner bag 10 for injecting the test medium in the cloth bag 1 and pressurizing the inner bag 10. In this case, the pressure resistance test eliminates the risk of damage mainly in the vicinity of the test medium injection portion of the inner bag 10.

  The cloth bag 1 includes a bag body 2 and an inlet tube portion 3 that serves as an inlet into the bag body 2.

  As shown in an example in FIG. 1, the bag body 2 includes a body portion 2 a and end face portions 2 b connected to both ends of the body portion 2 a by stitching, and the connection portion is a corner portion 4. .

  The inlet cylinder portion 3 has a cylindrical shape having a length required when the cloth bag 1 is closed, and one end side is connected to an opening 5 (see FIG. 3A) formed in the bag body 2 by sewing. The connecting portion is a corner portion 6.

  The other end side of the inlet tube portion 3 is an opening 7.

  In the corner portion 6 on the inlet side of the bag body 2, the opening 5 of the bag body 2 and each end edge portion of the inlet tube portion 3 are folded and overlapped on the inside as shown in FIG. Therefore, the seam 8 of the corner portion 6 is on the inside of the bag body 2, and the inside of the corner portion 6 is in a state where the folded portion of the cloth by the seam 8 is on a business trip.

  At the corner portions 4 on both end sides of the bag body 2, the end edges of the body portion 2a and the end surface portion 2b are folded outward and overlapped as shown in FIG. Therefore, the seam 8 of the corner part 4 is on the outer side of the bag body 2, and the inner side of the corner part 4 is a smooth surface without a bulge.

  The inner bag 10 to be put in the cloth bag 1 is inflated by being put in the bag body 2 through the inside of the inlet tube portion 3 of the cloth bag 1 and pressurizing, so that the pressure test of the cloth bag 1 can be indirectly performed. .

  For this purpose, the inner bag 10 is made of a thin film material that can be expanded and contracted, such as rubber or vinyl. Further, the inner bag 10 is folded small when contracted so that it can be put into the bag body 2 through a narrow space in the inlet tube 3 of the cloth bag 1.

  Further, the inner bag 10 has a pressure resistance that can withstand an indirect pressure test of the cloth bag 1 without allowing the fluid 12 of the test medium to pass therethrough so as to be pressurized.

  Further, the inner bag 10 is configured such that the outer diameter dimension when expanded is larger than the inner diameter dimension of the bag body 2, and when the bag body 2 is pressurized and expanded in the bag body 2, the bag body An indirect pressure resistance test of the cloth bag 1 can be performed by applying an internal pressure to 2.

  The inner bag 10 includes a cylindrical inlet 11 such as a rubber balloon mouth. The length of the inlet 11 of the inner bag 10 is substantially the same length as that of the inlet tube portion 3 of the cloth bag 1. Further, the outer diameter of the inlet 11 of the inner bag 10 is smaller than the inner diameter of the inlet tube portion 3 of the cloth bag 1, and the inner bag 10 is inserted into the bag body 2 of the cloth bag 1 in the pressure test of the cloth bag 1. When the inlet 11 is inserted and positioned inside the inlet cylinder 3 of the cloth bag 1, a gap is formed between the inlet 11 and the inlet cylinder 3.

  By the way, since the inner bag 10 is folded into a small size when contracted, the inner bag 10 can be inserted into the cloth bag 1 through the inlet tube portion 3, but since the inlet tube portion 3 is made of cloth, the opening 5 of the inlet tube portion 3 is used. The slip of the inner bag 10 is bad in the range from the corner portion 6 to the corner portion 6. Therefore, it is difficult for the inner bag 10 to pass smoothly. In particular, when the inner bag 10 is a rubber bag, the tendency is remarkable. On the other hand, when the inner bag 10 placed in the cloth bag 1 is pressurized and inflated, the inner bag 10 is inflated along the corner portion 6, so that the seam 8 of the corner portion 6 is on the inner side and the fabric is located. When the folded portion is on a business trip inward, the inner bag 10 that is moved in contact with the corner portion 6 may be damaged. In particular, when the inner bag 10 is a rubber bag, the tendency is remarkable.

  In view of such a point, the present invention arranges an inner bag breakage prevention tube 13 in a gap formed between the inside of the inlet tube portion 3 of the cloth bag 1 and the outer side of the inlet 11 of the inner bag 10, One end portion 13a on the insertion end side of the inner bag breakage prevention tube 13 into the inlet tube portion 3 is positioned so as to protrude from the corner portion 6 of the cloth bag 1 to the inside.

  The inner bag breakage prevention pipe 13 is made of resin and has a straight pipe shape. The inner bag breakage prevention tube 13 preferably has a certain degree of rigidity so as not to be easily bent or deformed in the radial direction. It should just be a smooth surface that can be passed. Furthermore, it is preferable that at least the inner diameter side end portion of the one end portion 13a of the inner bag breakage prevention pipe 13 has a smooth arc shape, but it may not have an arc shape as long as the inner bag 10 can be smoothly deployed.

  As described above, the inner bag breakage prevention pipe 13 is intended to protect and guide the inner bag 10 and has substantially the same length as the inlet 11 of the inner bag 10 but is larger than the outer diameter of the inlet 11. It is the inner diameter. Further, the inner bag breakage prevention tube 13 has an outer diameter smaller than the inner diameter of the inlet tube portion 3 so as to be inserted inside the inlet tube portion 3 of the cloth bag 1. Thereby, the inner bag breakage prevention pipe 13 is disposed so as to be positioned in the gap between the inlet tube portion 3 of the cloth bag 1 and the inlet 11 of the inner bag 10, and when the inner bag 10 is put into the cloth bag 1. In addition, the guide and protection of the inner bag 10 are used in the range from the inlet tube portion 3 to the corner portion 6. Further, when the inner bag 10 is inflated in the cloth bag 1, the inner bag 10 is prevented from coming into contact with the corner portion 6 by the inner bag damage preventing tube 13, and the inner bag 10 is prevented from being damaged.

  14 is a coupler that connects the pressure line 15 to the inlet 11 of the inner bag 10, and 16 is a coupler 14 that prevents the coupler 14, the inlet 11, and the inner bag from being damaged while one end of the coupler 14 is inserted into the opening of the inlet 11. This is a caulking ring for integrating the tube 13 and the inlet tube 3. The crimping ring 16 is fastened so that the inlet tube portion 3, the inner bag breakage prevention tube 13, the injection port 11, and the coupler 14 are integrally fastened and fixed.

  When the pressure resistance test of the cloth bag 1 is performed using a fluid 12 such as air or water as a test medium, the inner bag breakage prevention tube 13 is inserted into the inside of the inlet tube portion 3 and arranged. Next, the inner bag 10 is put into the cloth bag 1 through the inner bag breakage prevention tube 13. In this case, the inner bag 10 is inserted into the inner bag breakage prevention tube 13 from the inlet side and pushed in a contracted state.

  Since the inner diameter portion of the inner bag breakage prevention tube 13 functions as a guide, the inner bag 10 pushed into the inner bag breakage prevention tube 13 can smoothly pass through the inner bag breakage prevention tube 13, As shown in FIG. 1, for example, the rubber balloon is put in the cloth bag 1 in a state before being inflated. At this time, since the inner bag 10 is guided by the inner diameter portion of the inner bag breakage prevention tube 13, there is no possibility of breakage.

  When the inner bag 10 is put in the cloth bag 1 and the injection port 11 is positioned inside the inner bag breakage prevention tube 13, the end of the coupler 14 is inserted into the injection port 11, The caulking ring 16 disposed outside the inlet cylinder portion 3 is caulked to clamp and hold the injection port 11 sandwiched between the coupler 14 and the inner bag breakage prevention tube 13.

  Next, the end of the pressure line 15 is connected to the coupler 14. Thereafter, the fluid 12 supplied through the pressurization line 15 is injected into the inner bag 10 as a test medium and pressurized. At this time, since the pressurizing line 15 does not need to be connected to the cloth bag 1, there is an advantage that workability on site is good.

  Since the inner bag 10 has an outer diameter larger than the inner diameter of the cloth bag 1, the inner bag 10 is inflated as shown in FIG. By pressing, the pressure resistance test of the cloth bag 1 using the fluid 12 is performed. In the above, when inflating the inner bag 10 by pressurizing the inner bag 10 in the cloth bag 1, the inner bag 10 is inflated from the one end portion 13 a on the cloth bag 1 side of the inner bag breakage prevention tube 13 and extends along the inner surface of the cloth bag 1. Is done. Moreover, since the one end portion 13 a of the inner bag breakage prevention tube 13 is positioned on the inner side of the cloth bag 1 with respect to the corner portion 6 of the cloth bag 1, the inner bag is inflated from the one end portion 13 a of the inner bag breakage prevention tube 13. 2 comes into contact with the inner surface of the cloth bag 1 from a position away from the corner portion 6 as shown in FIG. Therefore, the situation that the inner bag 10 is damaged due to the inner bag 10 coming into contact with the corner portion 6 is prevented in advance.

  When the pressure test of the cloth bag 1 is completed as described above, the inner bag 10 and the inner bag breakage prevention tube 13 put in the cloth bag 1 are removed from the cloth bag 1 and then subjected to a pressure test of another cloth bag 1 to be performed next. To be used.

  When removing the inner bag 10 from the cloth bag 1, first, the fluid 12 is sucked and discharged from the inner bag 10 through the pressurizing line 15, or after the pressurizing line 15 is removed from the coupler, the inner bag 10 is removed. The fluid 12 is discharged from the inside, and the inner bag 10 is contracted.

  Next, the coupler 14 is removed from the inlet 11. At this time, since the caulking ring 16 is caulked, if the coupler 14 cannot be removed, the caulking ring 16 is loosened or the caulking ring 16 is removed.

  When the coupler 14 is removed in this way, the inner bag 10 is pulled out of the cloth bag 1. In this operation, the inner bag 10 is pulled out through the inner bag breakage prevention tube 13 by pulling out the inlet 11 from the inlet side of the inner bag breakage prevention tube 13. At this time, since the inner bag 10 is pulled out using the inner diameter portion of the inner bag breakage prevention tube 13 as a guide, it is pulled out without being damaged.

  Next, the removal of the inner bag 10 and the inner bag breakage prevention tube 13 from the cloth bag 1 is completed by removing the inner bag breakage prevention tube 13 from the inside of the inlet tube portion 3 of the cloth bag 1. In this case, since it is difficult to separate the inlet tube portion 3 and the inner bag breakage prevention tube 13 due to the caulking ring 16, the inlet tube portion 3 may be cut near the caulking ring 16. .

  When the pressure resistance test of another cloth bag 1 is performed using the fluid 12 as a test medium, the inner bag breakage prevention tube 13 is inserted into the inlet tube portion 3 of the cloth bag 1 and arranged in the same manner as described above. By putting the inner bag 10 into the cloth bag 1 through the bag breakage prevention tube 13 and pressurizing it, an indirect pressure resistance test can be repeatedly performed.

  The cloth bag 1 of the DUT subjected to the pressure test is filled with, for example, earth and sand, grout, aggregates, etc., and is used as a thing to pile up and prevent the movement of water and sand in the event of a disaster. The

  Note that the present invention is not limited to the above-described embodiment. For example, the case of crimping with the crimping ring 16 from the outside of the inlet tube portion 3 of the cloth bag 1 will be described, and the case where the inlet tube portion 3 is cut when the inner bag breakage prevention tube 13 is removed from the inlet tube portion 3 will be described. However, the length of the inlet tube portion 3 may be shorter than that of the inner bag breakage prevention tube 13, and the outer side of the inner bag breakage prevention tube may be crimped except for the inlet tube portion 3.

  Although the cloth bag 1 is illustrated as an object to be tested for pressure resistance, the pressure resistance test can be performed in the same manner even if the shape of the cloth bag 1 is not illustrated, and the pressure resistance test of a thin-walled container can be similarly performed instead of the cloth bag 1. Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Cloth bag (test object), 2 bag main body, 3 inlet cylinder part, 6 corner part, 10 middle bag, 11 inlet, 12 fluid (test medium), 13 middle bag damage prevention pipe, 13a middle bag damage prevention pipe One end, 15 pressure line

Claims (3)

Connect the end of the inlet tube that allows the test medium to be poured into the DUT that leaks the test medium to form a corner,
One end portion of the inner bag breakage prevention tube inserted into the inlet tube portion of the device under test is disposed so as to protrude to the inside from the corner portion,
The inner bag for injecting the test medium, which is put into the test object through the inside of the inner bag breakage prevention tube, is inflated by pressurizing with the test medium to apply pressure to the test object, A pressure test method for a device under test characterized by performing a pressure test on the device under test. The pressure resistance test method for a test object according to claim 1, wherein the inner bag for injecting the test medium is placed as a thin film material in the test object through the inner bag breakage prevention tube and inflated. . The inner bag for injecting the test medium is inflated from one end of the inner bag breakage prevention tube by the test medium injected through an inlet located in the inner bag breakage prevention pipe. A pressure test method for the DUT.

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