JP3186103U - Test plug - Google Patents

Abstract

[PROBLEMS] To provide a test plug provided with a seal body for improving the detachability of the plug body and the durability of a seal member in a test plug used as a connection part of an extension pipe or an equipment pipe.
A joint body 1 having a tapered wall surface 12b formed on the inner peripheral surface of the opening end and a plug mounting portion 13b on the outer peripheral surface, and a cap shape mounted on the plug mounting portion, and a test connecting portion 43 on the outer bottom surface. The plug body 4 is provided with a cap nut body 5 that is attached and sealed to the test connection portion of the plug body, and when the joint body 1 and the plug body 4 are mounted as sealing members, A cylindrical lump-shaped resin seal body 6 having a through-hole that does not block communication between the test connection portion and the inside and being compressed in close contact with the tapered wall surface 12b and the bottom surface of the plug body is employed.
[Selection] Figure 2

Description

  The present invention relates to a test plug used for refrigerant piping or the like.

  In refrigerant piping and other piping, an air tightness test (confirmation that there is no gas leak or liquid leak) is performed after the piping installation is completed. The air tightness test is performed at the location (piping opening end) connected to the refrigerant supply device. An inspection pump for applying a predetermined pressure is connected to one end, the other end is sealed, and a predetermined refrigerant supply device is connected to the open end of the pipe after the airtight test is completed. When a large number of related devices are connected, an inspection pump is connected to one end of the pipe, and the connection portion is sealed after the inspection is completed.

  As a plug member (test plug) for closing the open end of the pipe in this pipe airtight test, there is known a plug to be attached by screwing when the pipe is a resin pipe (Japanese Patent Laid-Open No. 9-296896). JP, 2000-337581, A). In refrigerant piping (on-vehicle air conditioners), caps for sealing union joints have been proposed for disassembly and delivery (Japanese Patent Laid-Open No. 9-126382, registered utility model No. 3050092).

  When performing the airtight test of the refrigerant pipe described above, the diameter of the pipe often does not match the diameter of the hose for injecting high-pressure gas from a test pump or high-pressure cylinder that applies a predetermined pressure, Previously, a pipe that could be connected to the injection hose was connected to the pipe end by welding means (brazing), and the other open end was also sealed by brazing, which required very cumbersome work. It was.

  As a countermeasure against this, the present applicant has proposed test plugs described in Patent Document 1 and Patent Document 2. Patent Document 1 includes a plug body, a cap nut body, a tightening nut body, and a sleeve body, and the plug body includes a tapered wall surface whose diameter increases on the opening side, and a mounting portion that uses an outer peripheral surface as a screw. The sleeve body is located on the outer peripheral surface of the end of the refrigerant pipe A, and is provided with a connecting portion having a diameter and an outer peripheral screw that can be connected to the high-pressure gas injection hose for inspection on the side opposite to the mounting portion. When the tightening nut body is screwed onto the part, the test plug is deformed by the tight pressing by each tapered wall surface, the both ends are closely attached to the outer peripheral surface of the pipe, and the curved portion is closely attached to the tapered wall surface to realize sealing. It is disclosed.

  In Patent Document 2, a tapered wall surface that expands outward is formed on an inner peripheral surface of an opening end, a screw is engraved on the outer peripheral surface, a plug mounting portion is provided, and a joint that is connected to a pipe end of a predetermined pipe A body and a cap shape to be attached to the plug attachment portion, and an attachment screw portion that is screwed to the plug attachment portion is formed on the inner peripheral surface, and is communicated with the inner side on the outer bottom surface and is a high pressure gas injection hose for inspection There is disclosed a test plug comprising a plug body provided with a test connecting portion having a diameter and an outer peripheral screw that can be connected to the plug body, and a cap nut body that is attached to the test connecting portion of the plug body and sealed.

Registered utility model No. 3122465. Registered utility model No. 3174164.

  When the test plug disclosed in Patent Document 1 is connected to a place where the test plug is attached or a new pipe is connected, the test plug is removed and a predetermined joint is used again. When connecting this test plug, since the tip of the sleeve body is biting into the pipe due to the curvature of the sleeve body, when the test plug is removed, the mounting trace of the sleeve body ( (Dent) remains. For this reason, when a joint member is connected as it is, it may cause a leak. Therefore, a test plug described in Patent Document 2 comprising a joint body attached to the pipe end of the pipe A and a plug body attached to the joint body has been proposed.

  Therefore, the test plug described in Patent Document 2 is attached to the pipe end and used for a leak test. After the leak test, only the plug body is removed, and the joint body is left as it is. It can be used as a member.

  Further, the test plug described in Patent Document 2 has a sealing body interposed between the plug mounting portion of the joint body and the plug body as a means for ensuring the sealing between the joint body and the plug body. The O-ring is attached to the hard body, and the O-ring is used to seal it.

  However, securing the sealing using the O-ring may be broken due to friction in the plug body attaching / detaching operation, and the sealing may not be secured, so it cannot be said that the durability is necessarily excellent. Furthermore, in order to secure a predetermined sealing with the O-ring, it is necessary to fasten the plug body with a sufficient force, and there is a problem in terms of workability.

  Therefore, the present invention proposes a new test plug that employs a sealing body excellent in durability and plug body operability.

  The test plug according to the present invention has a predetermined structure connected to a pipe end of a predetermined pipe, forms a tapered wall surface that expands outward on the inner peripheral surface of the opening end, and engraves a screw on the outer peripheral surface. And a joint body provided with a plug mounting portion, a cap shape to be mounted on the plug mounting portion, a mounting screw portion screwed with the plug mounting portion on the inner peripheral surface, and an inner side on the outer bottom surface, A plug body provided with a test connecting portion having a diameter and an outer peripheral screw that can be connected to and connected to a high-pressure gas injection hose for inspection, a cap nut body that is attached to the test connecting portion of the plug body and sealed, and the joint body When the plug body is mounted, it is provided with a through hole that does not block communication between the test connecting portion of the plug body and the inside, and is configured by the taper wall surface and the resin seal body that is compressed in close contact with the bottom surface of the plug body It is characterized by this.

  Thus, the joint body is connected to the pipe end portion of the pipe, and the plug body is attached to the joint body. After the high pressure gas necessary for the test is injected from the test connection portion of the plug body, the cap nut body is attached to the test connection portion. Installing. Then, the gas leak inspection (air tightness test) is performed by leaving it for a whole day and night. Especially, when the resin seal body is placed in a predetermined position and the plug body is screwed to the joint body, the resin seal body is substantially cylindrical. The outer surface of the joint body is in close contact with the tapered wall surface of the joint body and the inner bottom surface of the plug body, so that leakage from the threaded portion of the joint body and the plaque body is surely sealed without strongly tightening the plug body. In particular, the test plug of the present invention can be used as a body member of a pipe joint as it is when the plug body is removed.

  A test plug according to the present invention (Claim 2) is formed by forming a surface facing the tapered wall surface on the bottom surface of the plug body on the inclined bottom surface, and chamfering the edge portion of the resin seal body corresponding to the tapered surface and the inclined bottom surface. (Chamfered portion) Since the portion that realizes sealing is a tapered surface (inclined surface), when the plug body is screwed and tightened, the tapered surface (inclined surface) and the surface of the seal body are lightly applied. The handle will be in close contact.

  A test plug according to the present invention (Claim 3) is provided with an inner cylinder part on the opening side of a joint body, and a through hole into which the inner cylinder part can be inserted in a resin seal body. When connecting the extension pipe of the connecting pipe by removing the pipe, the end of the sleeve body when the sleeve body is deformed when the extension pipe is extrapolated to the inner cylinder portion and the sleeve body is deformed by the taper wall surface is realized. Increases durability against edge biting.

  The test plug according to the present invention (Claim 4) has a check valve body (musi) built in the test connection part, and prevents the backflow of the injected gas when injecting the high-pressure gas in the leak test. It improves the workability of the test.

  The test plug according to the present invention (Claim 5) has an inner peripheral surface and a nut mounting portion in which the pipe end connection structure of the pipe of the joint body is a tapered wall surface that expands the connection side end of the joint body to the pipe side. A taper wall surface that is formed on the outer peripheral surface provided and that corresponds to the shape of the coupling-side end of the joint body, and that is threaded into the nut mounting portion of the joint body on the inner peripheral surface, and is opposed to the taper wall surface of the joint body When the fitting body and the fastening nut body are screwed together, the pipe of the pipe inserted into the joint body at both ends is deformed by tight pressing with the respective tapered wall surfaces. It is composed of a sleeve body that tightly presses the outer peripheral surface of the end portion, and the main body of a pipe joint that uses an existing sealing sleeve body can be used as it is as a joint body.

  The test plug according to the present invention (Claim 6) has the same cap shape as the plug body, and is provided with a closed body that is not provided with a test connecting portion and whose inner bottom surface is sealed. When a closed body is attached instead of the plug body, the pipe end portion can be reliably closed, and the joint body can be used as a pipe joint by removing the closed body when connecting the extension pipe. Is.

  In the present invention, the test plug is composed of a joint body and a plug body as described above, and the joint body attached to the pipe end of a predetermined pipe can be used as it is as a pipe joint for an extension pipe. In a test plug that can easily connect an extension pipe without the need for pipe connection work, a substantially cylindrical lump-shaped resin seal body is used to secure the seal between the joint body and the plug body. The plug body can be operated without using a tool for screwing and detaching, and seal durability can be ensured even during repeated detachment.

The exploded front view of the embodiment of the present invention. Explanatory drawing (part sectional drawing) of the state which attached the joint body to the test object piping. Explanatory drawing (sectional drawing) of the state which mounted | wore with the plug body. Explanatory drawing (sectional drawing) of the state which mounted | wore the same obstruction | occlusion body.

  Next, an embodiment of the present invention will be described. The test plug shown in the embodiment includes a joint body 1, a tightening nut body 2 and a sleeve body 3 for connecting the joint body 1 to the test target pipe A, a plug body 4, a cap nut body 5, a seal body 6, and a closure. Consists of a body 7.

  The joint body 1 uses an existing pipe joint part (joint main body part) as it is, and is an inner cylinder in which the test target pipe A is extrapolated and has an inner diameter into which the test target pipe A can be inserted by the front and rear target members. Both end portions provided with the portions 11a and 11b have a double cylinder structure, taper wall surfaces 12a and 12b that expand outward are formed on the inner peripheral surface of the opening end portion, and screws are engraved on the outer peripheral surface to form a nut mounting portion 13a. And a plug mounting portion 13b.

  The tightening nut body 2 is employed in an existing pipe joint, and corresponds to the screw portion 21 screwed into the nut mounting portion 13a of the joint body 1 on the inner peripheral surface and the tapered wall surface 12a of the joint body 1. A tapered wall surface 22 is formed.

  The sleeve body 3 can also use an existing product, and has a size that is extrapolated to the test target pipe A.

  The plug body 4 has a cap shape to be attached to the plug attachment portion 13b, and has an attachment screw portion 41 that is screwed with the plug attachment portion 13b on the inner peripheral surface, and an inner bottom surface 42 that is inclined to face the tapered wall surface 12b. A bottom surface 42a is formed, and a test connecting portion 43 having a diameter and an outer peripheral screw projecting from the inner side and connectable to a high-pressure gas injection hose for inspection is provided on the bottom surface portion. In addition, a check valve body (so-called worm) 44 is internally provided in the test connecting portion 43.

  The cap nut body 5 is attached to the test connecting portion 43 of the plug body 4 to seal the portion.

  The resin sealing body 6 is formed of, for example, nylon resin having appropriate flexibility, and is a space surrounded by the tapered wall surface 12 b and the inner bottom surface 42 of the plug body 4 when the plug body 4 is mounted on the joint body 1. And a chamfered portion 62, 63 corresponding to the tapered wall surface 12b and the inclined bottom surface 42, respectively, in a cylindrical lump shape having a through hole 61 through which the inner cylinder portion 11b is inserted at the center. .

  The closing body 7 has a cap shape that is the same shape as the plug body 4, and has a mounting screw portion 71 that is screwed to the plug mounting portion 13 b on the inner peripheral surface, and an inclined bottom surface 72 a that faces the tapered wall surface 12 b on the inner bottom surface 72. , And the bottom portion has a shape that is not provided with the test connecting portion 43 and is sealed.

  Thus, the joint body 1 is attached to the pipe end of the test target pipe A, and the mounting means sequentially extrapolates the tightening nut body 2 and the sleeve body 3 to the test target pipe A as in the conventional pipe joint. The inner cylinder part 11a is inserted into the pipe end of the test target pipe A, and the screw part 21 of the tightening nut body 2 is screwed and attached to the nut attaching part 13a. As a result of the screwing, the sleeve body 3 is deformed by tight pressing with the tapered wall surfaces 12a and 22 and the outer peripheral surface of the test target pipe A is pressed tightly at both ends so that the joint body 1 is hermetically connected to the test target pipe A (FIG. 2).

  When the joint body 1 is connected to the pipe end of the pipe A to be tested, the seal body 6 is extrapolated to the inner cylinder portion 11b so that the tapered slope 61 faces the tapered wall surface 12b, and further from the outside (opening side). The plug body 4 is screwed and attached to the plug mounting portion 13 b of the joint body 1.

  When the plug body 4 is screwed to the joint body 1, the tapered wall surface 12 b of the joint body 1 and the chamfered portion 62 of the resin seal body 6 are in close contact with each other, and the inclined bottom surface 42 a and the chamfered portion 63 of the plug body 4 are in close contact with each other. And the said location is sealed reliably. In particular, by adopting the flexible resin seal body 6, even if the plug body 4 is lightly tightened by hand, the resin seal body 6 can be deformed and surely sealed.

  Therefore, a compressor or a high-pressure cylinder is connected to the test connecting portion 43, and high-pressure gas necessary for the test is injected from the test connecting portion 43. After this injection, the cap nut body 5 is attached to the test connecting portion 43 and left for a day and night to perform a gas leak inspection (airtight test).

  If the pipe A is in a closed state (one opening pipe end), the joint body 1 may be attached only to the relevant part. However, if the pipe A is in an open state (a plurality of opening pipe ends), all the pipe ends are attached. The joint body 1 is mounted, the resin seal body 6 is housed, and the closing body 7 is mounted.

  The plug body 4 is removed after the end of the leak test, but the joint body 1 exposes the same structure as the pipe joint body. 2 and the sleeve body 3 can be used for easy connection.

  Further, when the extension pipe or the equipment connection pipe is not connected, the plug body 4 is replaced with a closing body 7 which is screwed and attached, so that the portion is sealed and the joint portion of the joint body 1 is protected. Therefore, when it is necessary to connect extension piping or equipment connection piping, it can be dealt with immediately.

  Although the present invention has shown an example in which an existing pipe joint member is used, if the joint body has a plug body mounting portion, the joint body is fixedly connected to the pipe end by welding or the like. May be.

  As described above, in the test plug of the present invention, the joint body is attached to the pipe end, the plug body is attached to the joint body and used for the leakage test. After the leakage test, only the plug body is removed. It has the advantage that it can be used as a member for connecting pipes for extension pipes as it is, and the adoption of a resin seal body makes it easy to attach and detach plug bodies and closure bodies. The body is not damaged and the durability of the sealing member is enhanced.

DESCRIPTION OF SYMBOLS 1 Joint body 11a, 11b Inner cylinder part 12a, 12b Tapered wall surface 13a Nut mounting part 13b Plug mounting part 2 Tightening nut body 21 Screw part 22 Tapered wall surface 3 Sleeve body 4 Plug body 41 Mounting screw part 42 Inner bottom face 42a Inclined bottom face 43 Test connecting portion 44 Check valve body 5 Cap nut body 6 Resin seal body 61 Through hole 62, 63 Chamfering portion 7 Closure body 71 Mounting screw portion 72 Inner bottom surface 72a Inclined bottom surface

Claims (6)

Provided with a predetermined structure connected to the pipe end of a predetermined pipe, a tapered wall surface that expands outward is formed on the inner peripheral surface of the opening end, and a plug mounting portion is provided by engraving screws on the outer peripheral surface A joint body;
Cap shape to be attached to the plug attachment part. Formed on the inner peripheral surface is an attachment screw part that is screwed with the plug attachment part. The outer bottom surface communicates with the inner side and can be connected to a high-pressure gas injection hose for inspection A plug body provided with a test connecting portion having a large diameter and an outer peripheral screw, a cap nut body attached and sealed to the test connecting portion of the plug body, and when the joint body and the plug body are attached, A test plug comprising a through-hole that does not block communication between the test connecting portion and the inside, and comprising the taper wall surface and a resin seal body that is compressed in close contact with the bottom surface of the plug body.   The test plug according to claim 1, wherein a surface facing the tapered wall surface on the bottom surface of the plug body is formed on the inclined bottom surface, and an edge portion of the resin seal body has a chamfered shape corresponding to the tapered wall surface and the inclined bottom surface.   The test plug according to claim 1 or 2, wherein an inner cylinder portion is provided on the opening side of the joint body, and a through hole having an inner diameter through which the through hole of the resin seal body can be inserted is provided.   The test plug according to any one of claims 1 to 3, wherein a check valve body is built in the test connecting portion.   The pipe end connection structure of the pipe of the joint body is formed on the outer peripheral surface provided with an inner peripheral surface and a nut mounting portion, where the connection side end portion of the joint body is a tapered wall surface expanding to the pipe side. A tightening nut body corresponding to the connecting side end shape and having a threaded portion screwed into the nut mounting portion of the joint body on the inner peripheral surface, and a tapered wall surface facing the tapered wall surface of the joint body, and the joint body When the fastening nut body is screwed together, the sleeve body is deformed by close pressing with the respective tapered wall surfaces, and the sleeve body presses the outer peripheral surface of the pipe end portion of the pipe inserted into the joint body at both ends. The test plug according to claim 1.   The test plug according to any one of claims 1 to 5, wherein a closure body having the same cap shape as the plug body and not provided with a test connecting portion and having an inner bottom surface sealed is used as an accessory.

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