JP2000337581A - Test plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a test plug excellent in working easiness and free of risk to damage threads in a groove formed in a joint provided at the piping outlet or the threaded portion of the test plug. SOLUTION: For inspecting water leakage at a water supply piping installed at a building, etc., a test plug is installed by screwing at a groove in a water cock socket 9 mounted at a piping outlet for choking the piping outlet, wherein a threaded part 3 having a smaller diameter than a cylindrical plug body 2 is provided consolidatedly at the forefront of the plug body 2, and a ring-shaped packing 4 is tightly fitted on the base end part of the threaded part 3, while a cylinder 5 to support the packing 4 is tightly fitted on the peripheral surface of the packing 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test plug used for inspecting a water supply pipe (including a hot water supply pipe) disposed in a building or the like for water leakage.

[0002]

2. Description of the Related Art When a water supply pipe is installed in a building or the like, a faucet socket or the like provided at each pipe outlet of a washroom, a bathroom, etc., in order to check whether or not water leakage occurs in the pipe. After a test plug is screwed into the concave groove of the joint to airtightly close, a test is performed to apply a constant water pressure to the pipe by a test pump.

[0005] As shown in FIG. 5, a conventional test plug 10 used for this inspection is formed by wrapping a sealing tape 12 around a screw portion 11 and screwing a screw groove into a water faucet socket 9 provided at a pipe outlet. It is decided to match. In addition, the screw portion 11 is attached to the faucet socket 9 with the sealing tape 12 wound thereon.
Is formed in a tapered shape so as to be easily screwed into the concave groove.

[0004]

However, the conventional test plug 10 has a threaded portion 11 on which a sealing tape 1 is attached.
Since it is necessary to wind the seal tape 12 every time the inspection is performed, an operation of peeling off the seal tape 12 used in the previous inspection and an operation of winding a new seal tape 12 are required, and there is a problem that workability is extremely poor.

Further, in this conventional test plug 10, the screw portion 11 is tapered and the sealing tape 12 is wound around its outer periphery, so that it does not smoothly mesh with the thread of the concave groove of the faucet socket 9. Sometimes. Therefore, the screw part 11 and the faucet socket 9 are screwed obliquely.
May damage the thread of the groove.

Therefore, the object of the present invention is to improve the workability and to prevent the thread of the test plug or the groove of the joint groove provided at the pipe outlet from being damaged. It is to provide a test plug that exhibits many effects.

[0007]

To achieve the above object, a test plug (1) according to claim 1 of the present invention.
Is a test plug which is screwed into a concave groove of a joint (9) provided at a pipe outlet to inspect a water supply pipe (7) provided in a building or the like for water leakage. A screw part (3) having a smaller diameter than the plug body (2) is integrally provided at the front end of the cylindrical plug body (2), and an annular packing (4) is provided on the outer peripheral surface of the base end part of the screw part (3). ), And a support cylinder (5) for supporting the annular packing is closely fitted to the outer peripheral surface of the annular packing (4). Note that the water supply pipe includes a hot water supply pipe.

The test plug (1) according to the second aspect is characterized in that the front end of the annular packing (4) is projected from the support cylinder (5) to the support cylinder (5).

Further, the test plug (1) according to the third aspect is characterized in that the screw portion (3) is constituted by a parallel screw.

The symbols in parentheses indicate corresponding elements or matters described in the drawings and the embodiments of the invention described later.

According to the test plug according to the first aspect of the present invention, the annular packing is tightly fitted on the outer peripheral surface of the base end of the screw portion.
The pipe outlet can be airtightly closed. Since the seal tape is not wound around the screw portion of the test plug, the work of winding the seal tape and the work of stripping the seal tape are not required, and the workability is excellent. In addition, since a seal tape is not required, it is more economical. Furthermore, since no sealing tape is used, it can be screwed and loosened in the groove of the joint such as a faucet socket provided at the same pipe outlet any number of times, and the air in the pipe can be easily vented. be able to. Furthermore, since the support cylinder is tightly fitted to the outer peripheral surface of the annular packing, even when a high pressing force acts on the annular packing from the front and rear during the screw-in assembly, bulging deformation in the radial direction is suppressed. Therefore, the annular packing does not extend completely.

According to the second aspect of the invention, in addition to the effects of the first aspect, the front end of the annular packing is projected from the support cylinder, so that the front end is connected to the pipe. The support cylinder does not interfere when elastically contacting an end face of a joint such as a faucet socket provided at the outlet, so that the elastic cylinder can be firmly and airtightly elastically contacted. Further, even when the object to be screwed is a unit having a large end face such as a unit take-out fitting, a stainless steel faucet, an elbow, or the like, the present invention can be applied. That is, when the test plug is screwed into such a joint, the front end of the annular packing protruding from the support cylinder is elastically deformed in the radial direction by the tightening force, and airtightly and elastically contacts the end face of the joint over a wide range, thereby achieving good sealing performance. Demonstrate.

Further, according to the third aspect of the present invention,
In addition to the functions and effects of the invention described in claim 1 or 2, since the screw portion is formed of a parallel screw and a sealing tape is not wrapped, the screw portion of the faucet socket provided at the pipe outlet can be smoothly screwed. Mesh with and screw. Therefore, the thread of the screw portion and the groove of the faucet socket will not be damaged. In addition, by not wrapping the sealing tape around the screw portion, the screw portion can be screwed and assembled to the faucet socket with a light force, so that a fastening tool such as a monkey wrench becomes unnecessary.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A test plug 1 according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partial sectional side view showing a test plug 1, and FIG. 2 is a front view thereof. FIG. 3 is a piping diagram of a general house as an example using the test plug 1. The same parts as those shown in the conventional example are denoted by the same reference numerals.

The test plug 1 according to the first embodiment of the present invention is provided at a pipe outlet in order to inspect a water supply pipe 7 (including a hot water supply pipe 7a) for leakage, for example, provided in a general house. It is screwed into a concave groove of a faucet socket 9 which is an example of the provided joint to close the pipe outlet, and has a total length of 100 mm and an outer diameter of the plug body 2 of 38 mm. In the present embodiment, it is attached to the concave groove of the faucet socket 9 provided at each of the pipe outlets of the kitchen, bathroom, toilet and toilet. After closing each pipe outlet with this test plug 1, the inspection pump 8 is operated to apply a constant water pressure (17.5 k / cm ³ ) in the water supply pipe 7 and the hot water supply pipe 7a. Inspection of the presence or absence of water leakage of 7, 7a.

In the test plug 1, a screw portion 3 having a smaller diameter than the plug body 2 is integrally provided at a front end of the cylindrical plug body 2, and an annular packing 4 made of rubber is provided on an outer peripheral surface of a base end portion of the screw portion 3. Closely fitting. Further, a support cylinder 5 for supporting the annular packing 4 is closely fitted to the outer peripheral surface of the annular packing 4. The support cylinder 5 is attached to the front end of the plug main body 2 with its front end protruding slightly from the plug main body 2. Then, the projecting portion and the screw portion 3
And the rear end of the annular packing 4 is fitted between them. The front end of the annular packing 4 is 1 to 2 m from the support cylinder 5.
m. Further, the screw portion 3 can be tapered, but here is constituted by a parallel screw.

To assemble the test plug 1 according to the present embodiment into the concave groove of the faucet socket 9 provided at the pipe outlet,
Without wrapping the sealing tape around the screw part 3 as in the past,
It is screwed into the groove of the faucet socket 9 as it is. As a result, the annular packing 4 closely and elastically contacts the end face of the faucet socket 9 provided at the pipe outlet and the front end face of the plug body 2. At the same time, the annular packing 4 is elastically deformed in the radial direction, and its inner peripheral surface is in close contact with the outer peripheral surface of the screw portion 3.
Thereby, the annular packing 4 exhibits a high sealing property. In addition, since the outer peripheral surface of the annular packing 4 is supported by the support cylinder 5, swelling deformation in the radial direction is suppressed, and the annular packing 4 does not extend completely.

Since the test plug 1 is screwed and assembled without the need for a sealing tape, it is excellent in workability and is economical. Further, the test plug 1 can be screwed into the faucet socket 9 provided at the same pipe outlet any number of times. Since it can be assembled or loosened, the air in the pipe 7 can be easily vented.

Further, in this embodiment, since the front end of the annular packing 4 is projected from the support cylinder 5, the front end face is brought into elastic contact with the end face of the faucet socket 9 provided at the pipe outlet. At this time, the support cylinder 5 does not interfere with the end face. Therefore, the front end of the annular packing 4 can be firmly and air-tightly contacted with the end face of the concave groove of the faucet socket 9 provided at the pipe outlet.

The test plug 1 according to the present embodiment
Since the screw portion 3 is formed of a parallel screw and is not wrapped with a sealing tape, the screw portion 3 can smoothly mesh with the screw of the concave groove of the faucet socket 9 provided at the pipe outlet, and can be screwed. There is no damage to the threads of the groove 3 or the faucet socket 9. Further, since the sealing tape is not wrapped, it can be screwed and assembled to the faucet socket 9 with bare hands without using a tool. A hexagonal head 6 is formed at the base end of the plug main body 2 so that the plug main body 2 can be tightened using a monkey wrench or the like.

FIG. 4 shows a test plug 1 according to a second embodiment of the present invention. In the test plug 1, the support cylinder 5 is made thin, and is not fitted to the outer peripheral surface of the plug body 2, but is fitted to only the outer peripheral surface of the annular packing 4. By doing so, in addition to the operation and effect of the test plug 1 shown in the first embodiment, the size of the support cylinder 5 can be reduced, so that there is an advantage that the manufacturing cost can be reduced.

[0022]

As described above, according to the test plug according to the first aspect of the present invention, (1) the outlet of the pipe can be air-tightly closed by the function of the annular packing, and a highly reliable inspection result can be obtained. Obtainable. (2) Since it is not necessary to wind and peel off the seal tape, the workability is excellent and the cost is high. (3) Since the same pipe outlet can be screwed and loosened any number of times, air can be easily removed from the pipe, and workability is improved. (4) Since the support cylinder is closely fitted to the outer peripheral surface of the annular packing, the annular packing does not extend completely even if a high pressing force acts on the annular packing.
The function of the packing can be favorably exhibited over a long period of time.

According to the second aspect of the present invention, in addition to the functions and effects of the first aspect, (1) the front end of the annular packing is projected from the support cylinder, so that the front end is formed. The part can be firmly and airtightly elastically contacted with the end face of the pipe outlet, and high sealing performance can be exhibited.
(2) Even if an object to be screwed and assembled is a joint having a large end face, good sealing performance can be exhibited, and a highly reliable inspection result can be obtained.

Further, according to the third aspect of the present invention,
In addition to the functions and effects of the invention described in claim 1 or 2,
(1) Since the screw portion is formed of a parallel screw and the seal tape is not wound, the screw portion smoothly meshes with the screw thread at the pipe outlet, and damages the screw thread or the joint screw such as a water faucet socket provided at the pipe outlet. Nothing. (2) It can be screwed and assembled to the pipe outlet with a light force, and a tool for tightening is not required, so that workability is improved.

[Brief description of the drawings]

FIG. 1 is a partial sectional side view showing a test plug according to a first embodiment of the present invention.

FIG. 2 is a front view of the test plug shown in FIG.

FIG. 3 is a piping diagram of a general house using the test plug shown in FIG. 1;

FIG. 4 is a partial sectional side view showing a test plug according to a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional side view showing a test plug according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Test plug 2 Plug main body 3 Screw part (parallel screw) 4 Annular packing 5 Support cylinder 6 Hexagonal head 7 Water supply pipe 7a Hot water supply pipe 8 Inspection pump 9 Water faucet socket 10 Test plug 11 Screw part 12 Seal tape

Claims (3)

[Claims] 1. A test plug, which is screwed into a groove of a joint provided at an outlet of a pipe and closes the outlet of the pipe, for inspecting a water supply pipe installed in a building or the like for water leakage. A screw portion having a smaller diameter than the plug body is integrally provided at the front end of the cylindrical plug body, an annular packing is tightly fitted to an outer peripheral surface of a base end portion of the screw portion, and further, an annular ring A test plug characterized by tightly fitting a support cylinder that supports packing. 2. The test plug according to claim 1, wherein a front end of the annular packing is protruded from the support cylinder. 3. The test plug according to claim 1, wherein the screw portion is constituted by a parallel screw.