JP2009270969A - Tool for leak test - Google Patents

Abstract

An object of the present invention is to provide a leakage inspection jig capable of reliably performing sealing on a portion to be inspected of a pipe to which a flange is attached in a short time.
The proposed leakage inspection jig 2 includes a plug portion 3 provided at an end portion of a pipe 1 to which a flange portion 6 is attached and a hole provided in the flange portion 6 of a device that performs leakage inspection. A plurality of spring-attached wires 4 that are hooked by hooks 7 provided at one end to pull the holes with a predetermined tension, and connected to the other end of the plurality of spring-attached wires 4 And a pressing plate 5 having a plurality of connecting portions 8 at the outer peripheral portion.
[Selection] Figure 1

Description

  TECHNICAL FIELD The present invention relates to a leakage inspection jig used when a leakage inspection is performed on a portion to be inspected of piping of a device in a device that performs an airtight inspection in a production process of the device, such as a fuel cell power generation device. .

  Conventionally, in equipment that performs airtightness inspection (leakage inspection) in the device production process, such as a fuel cell power generation device, a flange is attached to the inspection target part of the piping of the device by welding, and then the flange is sealed The plate is fixed with a plurality of bolts and nuts.

  However, according to this method, it is necessary to spend a lot of time for attaching and detaching the sealing plate, and the leakage inspection cannot be performed quickly. In particular, when there are many inspection points, the influence is remarkable.

  In addition, as a peripheral technology, in Patent Document 1, a holding plate in a pipe is fixed by a flange member and a connecting shaft, an O-ring is interposed in a cylindrical member that is externally mounted on the connecting shaft, and a piston member that has a packing is provided as a cylindrical member. And between the pipe and the inner surface of the pipe. Further, a collar is provided around the outer peripheral end surface of the press plate so as to contact the end surface of the packing, thereby forming a space to be tested. Then, a pressure test is performed by introducing high-pressure nitrogen gas into the space under test through a plug provided on the flange member.

  In Patent Document 2, the oil return pipe connected to the service tank on the ground is normally closed by a sealing plug, but when performing the test, the sealing plug is removed and a rubber plug is inserted into the cheek. Then, press the air into the rubber plug to expand it and close the oil return line at a certain position. Furthermore, a pressure-resistant region is formed by closing a gate valve on the oil supply pipe line to the underground oil tank, and a pressure leak test of the underground oil tank is performed.

  Patent Document 3 discloses a pressure test jig that eliminates the conventional welding, cutting, and finishing operations and simplifies the preparation work for the pressure test. This pressure test jig has a small-diameter shaft portion that is an elastic body slightly smaller than the inner diameter of the pipe, an elastic body that is larger than the outer diameter of the pipe, and has a recess into which one end of the pipe is inserted. A large-diameter flange portion having a fitting hole portion for fitting a fitting shaft portion of a pressing body (which is a female screw), a case body covering the pressing body and the large-diameter flange portion, a nut member, and a connecting member which is a male screw. Is done. The connecting member is inserted through the through hole of the small diameter shaft portion and inserted into the pipe end, the concave portion of the large diameter flange portion is inserted into the pipe end portion, and the insertion shaft portion of the pressing body is inserted into the fitting hole portion of the large diameter flange portion. The small-diameter shaft portion and the large-diameter shaft portion sandwiched between the head of the connecting member and the pressing body are fastened with the nut member by tightening the screw portion of the connecting member protruding from the insertion hole of the case body. The radial flange portion is compressed in the axial direction and expanded in the radial direction to form a pressure resistant region having an excellent sealing function.

  Patent Document 4 discloses a method for performing an airtight test while minimizing a section in which gas supply is stopped. That is, by supplying water to an airtight balloon provided inside the gas hose and inflating it, tightly contacting the inner wall of the gas pipe, separating the space between the outer periphery of the inner pipe and the inner wall of the gas pipe from the gas pipe, An airtight test section is formed. And the gas in a cylinder is supplied to an airtight test area through a pressure | voltage rise hose with a pump.

  Patent Document 5 discloses a drainage pipe leakage test method capable of performing work only on a floor to be tested. In other words, the first obturator is fitted to the vertical tube receptacle of the collecting pipe in the floor to be tested, and the vertical pipe receptacle is sealed by the sealing mechanism and the first obturator and connected to the collecting pipe. A part of the vertical pipe on the lower floor is sealed with a second obturator (suspended from the vertical pipe receptacle by a flexible pipe). Further, all the openings of the branch pipe are sealed to form an airtight test section, and a fluid is injected into the airtight test section for pressurization to perform a drainage pipe leak test.

  In Patent Document 6, an inflatable closing body is set on the inner surface of a pipe including a pressure-resistant joint in a contracted state, and a closing plate is attached to the end of the pipe. Then, the inflatable material is enclosed in the inflatable closure body from the outside by the inflatable material enclosure nozzle, the inflatable closure body is brought into close contact with the pipe, and a pressure-resistant region is formed between the inflatable closure body and the closing plate. And the pressure-resistant leak test material is enclosed with the pressure nozzle, and the local pressure-resistant leak test is performed.

In Patent Document 7, a cylindrical casing having an opening, a holding plate held by a plurality of claws attached to the casing, a rubber sleeve attached to the inner wall of the casing, an O-ring provided between the rubber sleeve and the pipe, The piping pressure-resistant jig | tool comprised by these is shown.
JP-A-7-140035 JP-A-8-35905 JP-A-6-26975 JP 2004-271407 A Japanese Patent Laid-Open No. 2001-281888 Japanese Patent Laid-Open No. 2-75929 JP 59-112240 A

  An object of the present invention is to provide a leakage inspection jig that can reliably perform sealing on a portion to be inspected of a pipe to which a flange is attached in a short time.

The proposed leakage inspection jig is used for the inspection target portion of the piping of the equipment that performs the leakage inspection.
This leakage inspection jig is constituted by a plug portion provided at a pipe end portion to which the flange portion of the device is attached, and an engagement portion for locking the plug portion to the pipe end portion.

  The engaging portion has a plurality of springs as a first configuration, and is engaged with a hole provided in the flange portion by a first engaging portion (such as a hook) provided at one end. And a pressing plate having a plurality of connecting portions connected to the other end of the plurality of spring-attached cords at the outer peripheral portion.

  As the second configuration, the engaging portion is of a size that can be inserted in a state where it is not expanded in the piping of the device, and the inside that expands beyond the inner diameter of the piping of the device due to the inflow of fluid is the expansion of the cavity. The plug portion further includes a pipe line communicating with the expansion member, and a check valve for stopping the backflow of the fluid flowing into the pipe line.

  A plurality of spring-loaded cords locked to the hole portion provided in the flange portion by the first engagement portion provided at one end with respect to the second configuration of the engagement portion; And a pressing plate having a plurality of connecting portions connected to the other end of the plurality of spring-loaded cords on the outer peripheral portion.

  In the first or second configuration of the engagement portion of the leakage inspection jig, the engagement member further includes a restraining member that is restrained by a portion to be inspected of a pipe of a device that performs the leakage inspection. Can be expanded and contracted, and a plurality of second engaging portions (holes for hook attachment, etc.) for locking the first engaging portions of the plurality of spring-loaded cords on the outer periphery. ) May be provided. Instead of locking the first engaging portion provided at one end of the plurality of spring-loaded cords to the hole provided in the flange portion, the outer periphery of the holding member held in the pipe It is also possible to lock to the plurality of second engaging portions.

  According to the 1st or 2nd structure of the said engaging part of the jig | tool for a leakage inspection to propose, the 1st engaging part provided in one edge part of the multiple cable body with a spring is made into a flange part. A pressing plate connected to a plurality of spring-loaded cords by engaging with a hole provided in the pipe or a plurality of second engaging parts on the outer periphery of the restraining member restrained by the pipe Compared with the conventional method of fixing the flange part and the sealing plate (not shown) using a bolt or nut tool, the pressure-tight state of the pipe can be reduced in a short time. Can be produced reliably.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing a state in which a leakage inspection jig according to a first embodiment of the present invention is attached to a pipe, and an axial front view of the leakage inspection jig.

The leakage inspection jig 2 shown in FIG. 1 is attached to a portion to be inspected of the pipe 1 of the apparatus as shown in FIG.
The leakage inspection jig 2 includes a plug portion 3, a plurality of wires 4 with springs, and a pressing plate 5.

  The plug portion 3 has a conical shape that expands toward the outside at a portion where the flange portion 6 is in contact with the pipe 1 to which the flange portion 6 is attached (the end thereof) or in the vicinity thereof, and in a plane perpendicular to the outer pipe axis direction. A protrusion is provided.

  The spring-loaded wire 4 is hooked by a hook 7 provided at one end of a hole provided in the flange portion 6, and the hole is pulled with a predetermined tension by the action of the spring of the spring-attached wire 4. In the present embodiment, the hook 7 is provided at one end of the wire 4 with spring. However, one end of the wire 4 with spring, such as a holding rod, is engaged with a hole provided in the flange 6. Any mechanism that stops can be employed.

  The pressing plate 5 has an annular shape as shown in FIG. Then, a plurality (four in the right axial front view of FIG. 1) of the plurality of (four in the right axial front view of FIG. 1) connecting portions 8 connected to the other end of the spring-loaded wire 4. Is provided at the outer peripheral portion, and a hole portion through which the protruding portion of the plug portion 3 is inserted is provided at the center portion. The pressing plate 5 is positioned on the plug portion 3 by inserting the protruding portion of the plug portion 3 through the hole of the pressing plate 5.

  Therefore, the plug portion 3 is passed through the pressing plate 5 connected to the plurality of spring-loaded wires 4 by pulling the hole provided in the flange portion 6 with a predetermined tension by the plurality of spring-equipped wires 4 and the hooks 7. Compared with the conventional method in which the flange 6 and the sealing plate (not shown) are fixed using a bolt or nut tool, the airtight state of the pipe can be quickly created. Can do.

Note that the hook 7 of the wire with spring 4 can be hooked in a portion other than the hole provided in the flange portion 6.
FIG. 3 is a perspective view of a cladding tube having a hook mounting hole for hooking the hook 7 of the wire 4 with spring.

The cladding tube 11 shown in FIG. 3 is restrained by the piping portion immediately after the flange portion in the piping to which the flange portion is attached.
As shown in FIG. 3, the cladding tube 11 has a hollow cylindrical shape that can be attached to the pipe. Then, the cladding tube 11 is divided into two in the pipe line direction, and the half-divided tubes are fastened by a hinge 12 or the like, so that the closed state attached to the pipe by a clasp (not shown) or the like can be maintained.

  Further, a hook mounting hole 13 is provided in the circumferential direction at a predetermined distance from the end of the cladding tube 11. In this embodiment, the hook mounting hole 13 is provided on the outer periphery of the cladding tube 11, but the hook provided at one end of the spring-loaded wire 4, such as a hook opened away from the flange. Any mechanism for locking 7 to the outer periphery of the cladding tube 11 can be employed.

FIG. 4 is a cross-sectional view showing a state in which a leakage inspection jig according to a modification of the first embodiment of the present invention is attached to a pipe, and a diagram showing an axial front view of the leakage inspection jig. is there.
In FIG. 1, the hook 7 of the spring-loaded wire 4 is hooked in the hole provided in the flange portion 6, but in FIG. 4, the hook 7 of the spring-loaded wire 4 is used for hooking the cladding tube 11. The difference between FIG. 1 and FIG. 4 is that the hole 13 is hooked.

FIG. 5 is a cross-sectional view showing a state in which a leakage inspection jig according to the second embodiment of the present invention is attached to a pipe.
In FIG. 5, a leakage inspection jig 22 is attached to the inspection target portion of the piping 21 of the device when the leakage inspection is performed.

The leakage inspection jig 22 includes an expansion member 23, a plug 24, a plurality of wires with springs 25, and a pressing plate 26.
The expansion member 23 is of a size that can be inserted in a state where the expansion member 23 is not expanded, and can be expanded beyond the inner diameter of the piping 21 by the inflow of a fluid such as a gas, and the inside is hollow.

  The plug portion 24 has a conical shape that expands toward the outside at a portion in contact with or near the pipe 21 to which the flange portion 27 is attached, and a pipe line that communicates with the expansion member 23. The pipe has a check valve 28 for stopping the backflow of a fluid such as an inflowing gas, and has a protrusion in a plane orthogonal to the outer pipe axis direction. In addition, as the check valve 28, the structure similar to the check valve used for the floating ring etc. of a playground equipment is applicable.

  The spring-equipped wire 25 is hooked by the hook 29 provided at one end of the hook-mounting hole 33 of the cladding tube 31 attached to the pipe 21, and the hole of the spring-equipped wire 25 is acted on by the spring action. Pull the part with a predetermined tension.

  The pressing plate 26 has an annular shape. And in the outer peripheral part, it has the some connection part 30 connected with the other edge part of the several wire 25 with a spring, and the hole part which penetrates the projection part of the plug part 24 is provided in the center part. The pressing plate 26 is positioned on the plug portion 24 by inserting the protruding portion of the plug portion 24 into the hole portion of the pressing plate 26.

  Therefore, the plurality of spring-loaded wires 25 and hooks 29 are connected to the plurality of spring-loaded wires 25 by pulling the hook mounting hole 33 of the cladding tube 31 attached to the pipe 21 with a predetermined tension. Compared with the conventional method in which a pressing force can be applied to the plug portion 24 through the pressing plate 26, and the flange portion 27 and the sealing plate (not shown) are fixed using a bolt or nut tool. The airtight state can be quickly created.

In addition, the plug part 24 and the expansion member 23 of FIG. 5 may be integrated with separated ones, or may be integrated in advance.
When the fluid is a gas, in the configuration of FIG. 5, for example, a hand pump is connected to the check valve 28 of the plug portion 24, and the expansion member 23 is expanded by the gas supplied from the hand pump.

  In the configuration of FIG. 5, the hook 29 of the spring-loaded wire 25 is hooked in the hole provided in the flange portion 27 instead of hooking the hook mounting hole 32 of the cladding tube 31 attached to the pipe 21. Is also possible. In this case, the cladding tube 31 becomes unnecessary.

  Further, in the airtight inspection at a low pressure, it is possible to adopt a configuration in which the pressing plate 26 and the plurality of spring-attached wires 25 connected thereto are not provided in FIG. However, even at a low pressure, it is more preferable to have the pressing plate 26 and the plurality of spring-attached wires 25 connected to the pressing plate 26 from the viewpoint of safety. Even in the case of the configuration without the pressing plate 26 and the plurality of spring-connected wires 25 connected thereto, the expansion member 23 is in close contact with the inner wall of the pipe 21 at the time of expansion. Thus, a more reliable airtight state can be created.

In the above description, the tension is generated by the spring of the spring-equipped wire 4. However, any tension generating mechanism such as a ratchet mechanism or a screw mechanism can be employed.
Moreover, it is preferable to use the method of each embodiment described above and its modification example for the airtight test | inspection at the low pressure of about 1 MPa or less, for example.

It is the figure which showed the sectional view which shows the state by which the jig | tool for leak inspection concerning 1st Embodiment of this invention was attached to piping, and the axial front view of this jig | tool for leak inspection. It is a perspective view of the inspection object part of piping to which the flange part was attached. It is a perspective view of a cladding tube which has a hole for hook attachment which hooks a hook of a wire with a spring. It is sectional drawing which shows the state with which the leak test jig | tool of the modification of 1st Embodiment of this invention was attached to piping, and the figure which showed the axial front view of this leak test jig. It is sectional drawing which shows the state by which the jig | tool for leak inspection which concerns on 2nd Embodiment of this invention was attached to piping.

Explanation of symbols

1,21 Piping 2,22 Leakage inspection jig 3,24 Plug portion 4,25 Wire with spring 5,26 Pressing plate 6,27 Flange portion 7,29 Hook 8,30 Connecting portion of pressing plate 11,31 Cladding tube 12 Hinge 13, 33 Hook mounting hole 23 Expansion member 28 Check valve

Claims (7)

In the leakage inspection jig used for the inspection target part of the piping of the equipment that performs the leakage inspection,
A plug provided at the end of the pipe to which the flange of the device is attached;
A leakage inspection jig comprising: an engaging portion that locks the plug portion to the pipe end portion. The engaging portion is
A plurality of spring-loaded cords locked by a first engagement portion provided at one end to a hole portion provided in the flange portion;
A pressing plate having a plurality of connecting portions connected to the other end of the plurality of spring-loaded cords at the outer peripheral portion;
The leakage inspection jig according to claim 1, wherein: The engaging portion is
It is a size that can be inserted in a state where it is not expanded in the piping of the device, and has an expansion member having a hollow inside that expands beyond the inner diameter of the piping of the device due to the inflow of fluid,
The leakage inspection jig according to claim 1, wherein the plug portion further includes a conduit communicating with the expansion member, and a check valve for stopping a backflow of fluid flowing into the conduit. The engaging portion is
A plurality of spring-loaded cords locked by a first engagement portion provided at one end to a hole portion provided in the flange portion;
A pressing plate having a plurality of connecting portions connected to the other end of the plurality of spring-loaded cords at the outer peripheral portion;
The leakage inspection jig according to claim 3, further comprising: It further has a detention member to be detained at a portion to be inspected of piping of a device that performs leak inspection,
The restraining member can be expanded / contracted, and a plurality of second engaging portions for locking the first engaging portions of the plurality of spring-loaded cords are provided on the outer periphery, The first engaging portion of the plurality of cords with springs is locked in either one of a hole provided in the flange or the second engaging portion. Or the jig | tool for leak inspection of 4. The plug portion has a conical shape that expands toward the outside at a portion that contacts the end portion of the pipe to which the flange portion is attached or in the vicinity thereof, and a protrusion is provided in a plane orthogonal to the outer pipe axis direction. Provided,
5. The leakage inspection jig according to claim 2, wherein the pressing plate is further provided with a hole through which the protrusion of the stopper is inserted in a central portion.   6. The leakage inspection jig according to claim 2, wherein a tension generating mechanism other than a spring, such as a ratchet mechanism, is used as a mechanism for generating tension in the cable body.