JP6331609B2 - Plug for fluid pressure inspection - Google Patents

Description

  The present invention is connected to an end of a pipe (test pipe) such as a resin pipe, applies a required pressure to a fluid such as water or air flowing in the test pipe, and the test pipe leaks in a pressurized state. The present invention relates to a fluid pressure testing plug for testing whether or not.

  After laying the pipe to be inspected, such as a resin pipe, it is necessary to inspect whether or not there is a leak in a part of the pipe to be inspected in advance. For this reason, a work for confirming that no pressure drop occurs by connecting a fluid pressure test plug to the end of the test tube and applying a predetermined water pressure or air pressure in the test tube in that state. .

  As this type of fluid pressure testing plug, for example, a fluid pressure testing plug is disclosed in Japanese Patent Application Laid-Open No. H10-228707. That is, in this plug for hydraulic pressure inspection, a sealing member is externally fitted to a cylindrical body that can be fitted to the end of the tube to be inspected, and the seal member is pressed from the outside by a seal pressing member to It is equipped with a tightening operation tool that is in close contact with the peripheral surface. This tightening operation tool is provided with a retaining member that bites into the outer peripheral surface of the tube to be inspected to prevent the tube to be inspected from being pulled out due to the inspection fluid pressure at the front end side in the pressing direction of the seal pressing member. The retaining member has a ring shape and is configured such that two portions in the diameter direction bite into the outer peripheral surface of the tube to be inspected by a moving force in the direction in which the tube to be inspected is pulled out.

Japanese Utility Model Publication No. 56-61437

  In the conventional hydraulic pressure inspection plug described in Patent Document 1, the retaining member is formed in a ring shape and is cantilevered with respect to the seal pressing member. Then, when the retaining member is disposed in an inclined state and the inspection fluid pressure is applied to the inspected tube, the two portions of the retaining member bite into the outer peripheral surface of the inspected tube.

  However, since the retaining member is cantilevered with respect to the seal pressing member and its free end is in a movable state, when any force acts on the free end of the retaining member during the hydraulic pressure test, There is a possibility that the inclination state of the retaining member is changed. In this case, there has been a problem that the retaining member cannot retain the tube to be inspected and the tube to be inspected may come out of the cylindrical body.

  Accordingly, an object of the present invention is to provide a fluid pressure test plug that can restrict the movement of a retaining ring and effectively retain the tube to be inspected.

In order to achieve the above object, the fluid pressure test plug according to the first aspect of the present invention holds the seal member on the outer periphery of the cylindrical body into which the end of the tube to be inspected is inserted , It has a diameter expansion mechanism that is compressed from the outside in the axial direction of the cylinder by screwing the nut against the male thread of the cylinder and is in close contact with the inner peripheral surface of the tube to be inspected. A retaining ring loosely fitted on the outer periphery of the tube to be inspected, and the retaining ring, when fluid pressure is applied to the inspected tube in a state where the seal member is in close contact with the inner peripheral surface of the inspected tube, together by pressing the outer peripheral surface of the inspection tube for regulating the escape of the inspection tube in an inclined state, in a fluid pressure test plug that is migratable configured to vertical standing state when fitted to be inspected tube the cylindrical body In addition, a fluid pressure is applied to the inspected pipe in the diameter expansion mechanism. When provided with a stopper for retaining the stopper inspection tube held in the inclined state of the ring missing, to the stopper, with circular holes to be fitted to the tubular body between the sealing member and the nut are formed A holding portion that protrudes from the circular hole and faces the retaining ring at the tip is provided, and the stopper is tilted by being pushed by the screwing nut. The holding unit is advanced to a position to be held in a state .

  According to the plug for fluid pressure inspection of the present invention, there is an effect that the movement of the retaining ring is restricted and the tube to be inspected can be effectively retained.

The perspective view which shows the plug for fluid pressure inspection in 1st Embodiment. (A) is a side view showing a plug for fluid pressure testing, (b) is a front view showing a plug for fluid pressure testing. The perspective view which shows a stopper. Sectional drawing which shows the plug for fluid pressure inspection. It is a figure which shows the effect | action of the plug for fluid pressure inspection, Comprising: Sectional drawing which shows the state which inserted the to-be-tested tube in the cylinder. Sectional drawing which shows the state which tightened the wing nut from the state of FIG. Sectional drawing which shows the state which further tightened the wing nut from the state of FIG. 6, and made the seal member contact | adhere to the inner peripheral surface of a to-be-tested tube. The perspective view which shows the stopper of the plug for fluid pressure test | inspection in 2nd Embodiment. (A) is a sectional view showing a state in which the stopper of the plug for fluid pressure inspection is rotated to suspend the retaining ring, and the tube to be inspected is inserted into the cylinder, and (b) is a view of the cylinder and the stopper. The sectional side view which shows a relationship. (A) is sectional drawing which shows the state which tightened the wing nut from the state of Fig.9 (a), (b) is a sectional side view which shows the relationship between a cylinder and a stopper. FIG. 11 is a cross-sectional view showing a state in which the wing nut is further tightened from the state of FIG. The perspective view which shows the stopper of the plug for fluid pressure test | inspection in 3rd Embodiment. Sectional drawing which shows the state which suspended the retaining ring and inserted the to-be-tested tube in the cylinder. Sectional drawing which shows the state which tightened the wing nut from the state of FIG. FIG. 15 is a cross-sectional view showing a state in which the wing nut is further tightened from the state of FIG. 14 and the seal member is brought into close contact with the inner peripheral surface of the test tube.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 7, the fluid pressure test plug 10 is connected to the end of the test tube 11 and has a required fluid pressure for a fluid containing a liquid such as water or a gas such as air flowing in the test tube 11. And inspecting whether or not there is a leak in the tube under test 11 in a pressurized state. As the tube 11 to be inspected, a resin tube such as a polybutene tube or a crosslinked polyethylene tube, or a metal tube such as a copper tube is used.

  As shown in FIGS. 1 and 2 (a) and 2 (b), the plug body 12 constituting the fluid pressure test plug 10 is formed in a cylindrical shape, and a pear-shaped large-diameter portion 13 having a pear-shaped cross section extending toward the bottom. The small-diameter portion 14 protrudes from one side surface of the large-diameter portion 13.

  As shown in FIG. 4, the cylindrical tube 16 constituting the diameter expansion mechanism 35 is inserted into the insertion hole 15 at the lower portion of the large-diameter portion 13, and the inside of the tube 16 communicates with the tube 11 to be inspected. A gas vent hole 17 is formed. A male screw 18 is threaded on the outer peripheral surface of the base end side (right side in FIG. 4) of the cylindrical body 16, and a wing nut 19 is threadedly engaged with the male screw 18. Further, a stopper 21 provided with a packing 20 is screwed to the base end portion of the cylinder 16, and when the fluid is liquid, the stopper 21 is removed and the gas in the tube 11 to be inspected can be vented. ing. By degassing, the fluid pressure in the tube 11 to be inspected can be stabilized and an accurate fluid pressure test can be performed.

  The end portion of the cylindrical body 16 is expanded in diameter to form a flange portion 22. A seal member 23 formed of a rubber-like elastic body is fitted on the outer peripheral portion of the cylindrical body 16 between the flange portion 22 and the small diameter portion 14 of the plug body 12. The tube 11 to be inspected is fitted into the outer periphery of the flange portion 22 of the cylindrical body 16, the seal member 23, and the small diameter portion 14 of the plug body 12.

  A screw hole 24 is formed through the upper portion of the large-diameter portion 13 of the plug body 12, and a male screw portion 27 formed at the end of the shaft portion 26 of the set screw 25 for supporting the spring is screwed into the screw hole 24. Are combined. A coil spring 29 as a biasing member is wound around the outer periphery of the shaft portion 26 of the set screw 25 between the head portion 28 of the set screw 25 and the large diameter portion 13 of the plug body 12.

  A small hole portion 32 formed in the cantilever support portion 31 at the upper portion of the retaining ring 30 is provided on the outer periphery of the shaft portion 26 of the set screw 25 between the head portion 28 of the set screw 25 and the end portion of the coil spring 29. Are loosely fitted, and the retaining ring 30 is cantilevered. The retaining ring 30 is held such that the cantilever support 31 is inclined with respect to the cantilever support 31 by the biasing force of the coil spring 29. The inclination angle of the retaining ring is set to 45 °, for example.

  As shown in FIGS. 6 and 7, the large hole portion 34 formed in the lower portion of the retaining ring 30 is inserted into the test tube 11 connected to the fluid pressure test plug 10. When the retaining ring 30 is inclined, the two locations in the diameter direction press the outer peripheral surface of the tube 11 to be inspected, and fluid pressure is applied to the tube 11 to be inspected during fluid pressure inspection. It comes to carry out retaining.

  As shown in FIG. 5, when inserting the tube 11 to be inspected into the cylinder 16, the free end 33 of the retaining ring 30 is pressed against the proximal end side of the cylinder 16 against the urging force of the coil spring 29. By doing so, it is possible to shift from the inclined state to the vertical state, and the test tube 11 can be easily inserted.

  As shown in FIGS. 3 and 4, the stopper 36 for restricting the movement of the retaining ring 30 is formed in a lateral L-shaped cross section, a circular hole 37 is opened in the lower part thereof, and the upper part is formed in a flat plate shape. A holding portion 38 is provided. A circular hole 37 of the stopper 36 is fitted into the cylindrical body 16 between the plug body 12 and the wing nut 19. The holding portion 38 of the stopper 36 is penetrated through a through hole 39 formed in the upper portion of the large-diameter portion 13 of the plug body 12 so that the tip portion thereof faces the cantilever support portion 31 of the retaining ring 30. It is configured.

  As shown in FIG. 6, in a state where the tube 11 to be inspected is connected to the fluid pressure test plug 10, by tightening the wing nut 19, the cylinder body 16 is moved to the proximal side with respect to the plug body 12, The seal member 23 is compressed from the outer side in the axial direction of the cylindrical body 16 between the flange portion 22 of the cylindrical body 16 and the small diameter portion 14 of the plug body 12. The compression of the seal member 23 increases the diameter of the seal member 23 so that the seal member 23 can be brought into close contact with the inner peripheral surface of the tube 11 to be inspected to exhibit a sealing function. Thus, the diameter-enlarging mechanism 35 for expanding the diameter of the seal member 23 includes the plug body 12, the small-diameter portion 14, the cylindrical body 16, the flange portion 22, the male screw 18, the wing nut 19, and the like.

  The stopper 36 is in contact with or close to the cantilevered support portion 31 of the retaining ring 30 when fluid pressure is applied to the inspected tube 11, and holds the retaining ring 30 in an inclined state so as to be inspected. It is comprised so that it may prevent.

The operation of the fluid pressure test plug 10 of the first embodiment configured as described above will be described.
As shown in FIG. 5, when the fluid pressure test plug 10 is used to inspect the leakage of the tube 11 to be inspected, the coil spring 29 is attached to the free end 33 of the retaining ring 30 with the finger 40. The tube 16 is pressed against the force toward the proximal end, and the end of the tube 11 to be inspected is inserted into the tube 16 in this state. After the test tube 11 is inserted, when the finger 40 is released from the free end 33 of the retaining ring 30, the retaining ring 30 returns to the inclined state by the urging force of the coil spring 29.

  In this way, by pressing the free end 33 of the retaining ring 30 with the finger 40, the retaining ring 30 can be easily shifted to the vertical state, and the tube 11 to be inspected is inserted into the cylindrical body 16. Proceed quickly. Furthermore, by removing the finger 40 from the free end 33 of the retaining ring 30, the retaining ring 30 can be automatically returned to the inclined state. When the fluid is a liquid such as water, after filling the liquid to be inspected 11, after removing the stopper 21 at the end of the cylinder 16 and degassing the pipe 11 to be inspected Then, the stopper 21 provided with the packing 20 is tightened at the end of the cylindrical body 16.

  Next, as shown in FIG. 6, when the wing nut 19 is screwed with respect to the male screw 18 of the cylindrical body 16, the stopper 36 is pushed forward by the wing nut 19, and the tip of the holding portion 38 of the stopper 36 is moved. Close to the cantilever support 31 of the retaining ring 30. At this time, the circular hole 37 of the stopper 36 is loosely fitted into the cylindrical body 16, and the holding portion 38 is passed through the through hole 39 of the large-diameter portion 13 of the plug body 12. As a result, the tip of the stopper 36 can be guided to the cantilever support portion 31 of the retaining ring 30.

  Subsequently, as shown in FIG. 7, when the wing nut 19 is further screwed, the sealing member 23 fitted to the cylindrical body 16 has the flange portion 22 of the cylindrical body 16 and the small diameter portion 14 of the plug body 12. , The seal member 23 expands in diameter and is in close contact with the inner peripheral surface of the tube 11 to be inspected. For this reason, it is possible to ensure the sealing performance at the connection portion between the end portion of the tube 11 to be inspected and the fluid pressure test plug 10.

  At the same time, the tip of the holding portion 38 of the stopper 36 abuts against the cantilever support portion 31 of the retaining ring 30. Therefore, the retaining ring 30 disposed in the inclined state can be held in the inclined state. In this state, a predetermined pressure is applied to the fluid in the tube 11 to be inspected, and a fluid pressure test is performed. In this case, if the pressure in the tube 11 to be inspected does not drop, it is normal, and if the pressure drops, it is judged abnormal.

  In a state in which fluid pressure is applied to the test tube 11, the test tube 11 attempts to come out of the fluid pressure test plug 10, but the test tube 11 is disposed on the outer peripheral surface of the test tube 11 in an inclined state. Two locations in the diameter direction of the retaining ring 30 bite into the outer peripheral surface of the test tube 11. At this time, since the tip of the holding portion 38 of the stopper 36 is in contact with the cantilever support portion 31 of the retaining ring 30, the inclined retaining ring 30 is supported by the stopper 36 and the inclined state is maintained. The Accordingly, the tube 11 to be inspected is prevented from coming out, and the connection state of the tube 11 to be inspected with respect to the fluid pressure inspection plug 10 is maintained.

  After the fluid pressure inspection of the tube 11 to be inspected, the wing nut 19 is screwed out, and then the free end 33 of the retaining ring 30 is pressed with the finger 40 to shift the retaining ring 30 to the vertical state. The test tube 11 is extracted from the cylinder 16 of the fluid pressure test plug 10.

The effects exhibited by the above first embodiment will be described collectively below.
(1) According to the fluid pressure test plug 10 in the first embodiment, the diameter expansion mechanism 35 is provided with the stopper 36 that holds the retaining ring 30 in an inclined state. For this reason, when fluid pressure is applied to the tube 11 to be inspected during fluid pressure inspection, the retaining ring 30 and the stopper 36 restrict the movement of the tube 11 to be removed from the fluid pressure inspection plug 10. can do.

Therefore, according to the fluid pressure test plug 10 of the first embodiment, there is an effect that the movement of the retaining ring 30 is restricted and the tube 11 to be inspected can be effectively retained.
(2) The retaining ring 30 is held in an inclined state by the cantilever support 31 being urged by the coil spring 29, and resists the urging force of the coil spring 29 when the tube 11 to be inspected is fitted into the cylinder 16. Thus, it is configured to be able to shift from an inclined state to a vertical state. Therefore, when the tube 11 to be inspected is inserted into and removed from the cylindrical body 16, the free end 33 side of the retaining ring 30 is pressed against the biasing force of the coil spring 29 with the finger 40 by a simple operation. The tube 11 can be inserted / removed quickly.

  (3) The stopper 36 is configured to come into contact with the cantilever support portion 31 of the retaining ring 30 when fluid pressure is applied to the test tube 11. Therefore, the retaining ring 30 can be supported by the stopper 36 and held in an inclined state to prevent the inspected tube 11 from coming off.

  (4) The cylindrical body 16 is provided with a gas vent hole 17 communicating with the tube 11 to be inspected and a stopper 21 for closing the gas vent hole 17. For this reason, when the fluid is a liquid, a plug 10 for fluid pressure inspection can be connected to the end of the tube 11 to be inspected, and the stopper 21 can be removed before the fluid pressure inspection is performed for degassing. The fluid pressure test can be performed with high accuracy.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment and a third embodiment to be described later, portions different from the first embodiment will be mainly described.

  As shown in FIG. 8 and FIG. 9A, the stopper 36 is formed in a lateral L-shaped cross section, a circular hole 37 is opened at the upper part, and a flat plate-like holding part 38 is formed at the lower part. . The circular hole 37 of the stopper 36 is loosely fitted to the cylindrical body 16 between the plug body 12 and the wing nut 19.

  As shown in FIGS. 10A and 10B, the holding portion 38 of the stopper 36 is positioned below the plug body 12, and its tip portion faces the free end portion 33 of the retaining ring 30. It is configured. As shown in FIG. 9B, the stopper 36 is configured to be rotatable in the circumferential direction with respect to the cylindrical body 16, and when the retaining ring 30 is shifted to the upright state, the stopper 36 is rotated in advance. Thus, it is configured so as not to interfere with the retaining ring 30.

  Now, as shown in FIGS. 9A and 9B, when the fluid pressure test is performed using the fluid pressure test plug 10 of the second embodiment, the holding portion 38 of the stopper 36 is a cylindrical body. For example, after rotating by 45 ° around 16, the free end portion 33 of the retaining ring 30 can be pressed with the finger 40 to shift to the vertical state. In this state, the tube 11 to be inspected can be fitted into the cylindrical body 16. After the test tube 11 is inserted, when the finger 40 is released from the free end 33 of the retaining ring 30, the retaining ring 30 returns to the inclined state by the urging force of the coil spring 29.

  Next, as shown in FIGS. 10A and 10B, when the holding portion 38 of the stopper 36 is released, the holding portion 38 rotates and is located directly below. In this state, when the wing nut 19 is screwed, the stopper 36 also moves forward with the movement of the wing nut 19, and its tip portion approaches the free end portion 33 of the retaining ring 30.

  Subsequently, as shown in FIG. 11, when the wing nut 19 is further tightened, the seal member 23 is compressed and expanded in diameter, and is in close contact with the inner peripheral surface of the tube 11 to be inspected. At the same time, the distal end portion of the holding portion 38 of the stopper 36 comes into contact with the free end portion 33 of the retaining ring 30. For this reason, the retaining ring 30 arranged in the inclined state can be held in the inclined state.

  Therefore, in the second embodiment, the distal end portion of the holding portion 38 of the stopper 36 restricts the movement of the free end portion 33 of the retaining ring 30. Therefore, according to the second embodiment, when the tip of the holding portion 38 of the stopper 36 in the first embodiment abuts against the cantilever support portion 31 of the retaining ring 30 to restrict the movement of the retaining ring 30. In comparison, the inclined state of the retaining ring 30 can be held more effectively.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 12 and 13, the stopper 36 is formed in an L-shaped cross section, and the upper portion thereof serves as a holding portion 38, and the holding portion 38 is formed with a planar rectangular opening 41. When the stopper 36 is attached to the fluid pressure test plug 10, the large-diameter portion 13 of the plug body 12 is inserted into the opening 41 of the stopper 36. Further, a circular hole 37 is opened at the lower portion of the stopper 36, and the circular hole 37 is loosely fitted to the cylindrical body 16 between the plug body 12 and the wing nut 19.

  Note that in the fluid pressure test plug 10 of the third embodiment, the cylinder 16 is not provided with the gas vent hole 17, and the packing 20 and the stopper plug 21 are not provided. For this reason, the plug 10 for fluid pressure inspection is used for the fluid pressure inspection of the tube 11 to be inspected through which a gas such as air flows.

  Now, as shown in FIG. 13, when the fluid pressure test is performed using the fluid pressure test plug 10 of the third embodiment, the free end 33 of the retaining ring 30 is pressed by the finger 40 and suspended. It is possible to shift to a standing state. In this state, the tube 11 to be inspected can be fitted into the cylindrical body 16. After the test tube 11 is inserted, when the free end 33 of the retaining ring 30 is released, the retaining ring 30 returns to the inclined state by the urging force of the coil spring 29.

  Next, as shown in FIG. 14, when the wing nut 19 is screwed, the stopper 36 also moves forward with the movement of the wing nut 19, and the tip portion thereof approaches the cantilever support portion 31 of the retaining ring 30.

  Subsequently, as shown in FIG. 15, when the wing nut 19 is further tightened, the seal member 23 is compressed and expanded in diameter, and is in close contact with the inner peripheral surface of the tube 11 to be inspected. At the same time, the tip of the holding portion 38 of the stopper 36 abuts against the cantilever support portion 31 of the retaining ring 30. For this reason, the retaining ring 30 can be held in an inclined state.

  Therefore, according to the third embodiment, the distal end portion of the holding portion 38 of the stopper 36 is formed wider, so that the retaining ring 30 is smaller than the stopper 36 of the first and second embodiments. The contact area of the holding portion 38 of the stopper 36 with respect to the cantilever support portion 31 is large, and the inclined state of the retaining ring 30 can be held in a more stable state.

In addition, since the through hole 39 is not provided in the large-diameter portion 13 of the plug main body 12 and the gas vent hole 17 is not provided in the cylindrical body 16, the configuration of the fluid pressure test plug 10 can be simplified.
It should be noted that the embodiments described above can be modified and embodied as follows.

  In the first to third embodiments, when the wing nut 19 is tightened to bring the seal member 23 into close contact with the inner peripheral surface of the tube 11 to be inspected, the tip of the holding portion 38 of the stopper 36 is attached to the retaining ring 30. You may comprise so that it may stop at the position made to approach, without making it contact | abut. Even in such a configuration, it is possible to maintain the inclined state of the retaining ring 30 and prevent the inspected tube 11 from coming off.

  -The front-end | tip part of the holding | maintenance part 38 of the said stopper 36 may be comprised in cross-sectional arc shape, or may be comprised in the forked shape. Or you may comprise the holding | maintenance part 38 of the stopper 36 so that it may contact or adjoin to the several location of the retaining ring 30. FIG.

  The retaining ring 30 is held in an inclined state that makes it easier to insert the test tube 11 into the cylindrical body 16 without shifting the test tube 11 to the vertical state before the test tube 11 is inserted into the cylindrical body 16. You may keep it.

  In the retaining ring 30, the retaining ring 30 is formed by forming irregularities at two locations in the diameter direction in contact with the tube 11 to be inspected, or by forming the irregularities in a tapered shape that becomes thinner toward the tip side. You may comprise so that it may become easy to bite into the outer peripheral surface of the to-be-inspected pipe | tube 11. FIG.

  DESCRIPTION OF SYMBOLS 10 ... Plug for fluid pressure test, 11 ... Pipe to be inspected, 16 ... Tube, 17 ... Gas vent hole, 21 ... Stopper plug, 23 ... Seal member, 29 ... Coil spring as urging member, 30 ... Retaining ring 31 ... Cantilever support part, 33 ... Free end part, 35 ... Diameter expansion mechanism, 36 ... Stopper.

Claims (1)

The seal member is held on the outer periphery of the cylinder body into which the end of the tube to be inspected is inserted, and the seal member is compressed from the outside in the axial direction of the cylinder body by the screwing of the nut with respect to the male screw of the cylinder body. The diameter expansion mechanism includes a retaining ring that is loosely fitted to the outer periphery of the tube to be inspected while being cantilevered, and the retaining ring is a seal. when the fluid pressure is made to act on the inspection tube in the state of being in close contact with member to the inner peripheral surface of the inspection tube, with pressing the outer peripheral surface of the inspection tube for regulating the escape of the inspection tube in an inclined state, A fluid pressure test plug configured to be able to shift to a vertical state when inserting a test tube into a cylindrical body ,
The diameter-expansion mechanism includes a stopper that retains the retaining ring in an inclined state and prevents the subject tube from coming off when fluid pressure is applied to the subject tube .
The stopper is formed with a circular hole that is fitted into the cylinder between the seal member and the nut, and protrudes from a portion having the circular hole so as to face the retaining ring at the tip portion. Part is provided,
A plug for fluid pressure inspection , wherein the stopper is pushed by the screwing nut to advance the holding portion to a position where the retaining ring is held in an inclined state .