JP3302829B2 - Gas leak inspection plug - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug for gas leak inspection, which is mounted in the middle of a gas pipe and is connected to a socket communicating with a pressure detecting device for gas leak inspection.

[0002]

2. Description of the Related Art As a conventional plug for inspection, there is one disclosed in Japanese Utility Model Publication No. 2-40364. As shown in FIG. 1, a screw end provided on a plug main body (1) having a hose end (D) is threadably connected to a branch pipe (P) interposed in the middle of a gas pipe. A gas passage (R) formed in the plug main body (1) is provided with a closing member (31) for opening and closing the gas passage (R), and the closing member (31) has a small diameter. A hole (31a) is formed through.

In this apparatus, first, a pressure detecting device (K) for gas leak inspection is connected to a plug main body (1) through a socket (S) provided at a gas hose terminal communicating with the pressure detecting device (K). Subsequently, the closing device (31) is rotated to the fully open position, and
(K) and the gas pipe. Thereafter, the main cock (V ₂ ) (V ₂ ) provided on the downstream side of the gas pipe is closed and the meter cock (V ₁ ) provided on the upstream side of the gas pipe is opened. Apply gas pressure to the pressure detector (K),
Further, the meter cock (V ₁ ) is closed. Thereafter, by confirming whether or not the detected pressure of the pressure detector (K) decreases, the presence or absence of gas leakage is determined.

In this apparatus, since the gas flow rate is set to be extremely small by making the hole (31a) small, the gas flow path (R) is not required in the non-inspection state (normal use state). There is no danger even if is opened. On the other hand, when using this inspection plug for air purging of a new pipe, close the main cock (V ₂ ) (V ₂ ) and open the meter cock (V ₁ ). (31) is rotated to the fully open position. As a result, the air in the pipe is evacuated through the gas flow path (R), and the gas is replaced in the pipe. However, in this case, as described above, the gas flow rate is set extremely small,
There is a problem in that the working time from the start of the air purge to the replacement with the gas becomes long.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to reduce the working time when the plug is used for air purging while ensuring safety. The subject.

[0006]

The technical means of the present invention taken to solve the above-mentioned problem is as follows: "Plug mainly equipped with hose end
(1), a valve element (3) built in the plug main body (1) and urged to a closed state by a spring, and a valve element (3) in a state of connection to the plug main body (1). First opening suitable for measuring pressure (C ₁ )
A socket (S) provided with a push rod (6) for opening the valve to a maximum height, and an auxiliary shaft (61) detachably connected to the socket (S) or the valve body (3). ) by connecting the socket (S) in the state of being connected to the plug main body (1), the valve body (3) first is suitable for the first opening (C ₁₎ greater opening to and than air purge The valve is to be opened to 2 degrees of opening (C ₂ ) ”.

[0007]

The above technical means of the present invention operates as follows. In this apparatus, a socket (S) communicated with a pressure measuring device is connected to a plug main body (1) at the time of gas leak inspection.
At this time, the push rod (6) or valve body (3) of the socket (S)
Do not connect the auxiliary shaft (61). As a result, the push rod (6) pushes the valve body (3) into the first opening (C ₁ ), and in this state, the pressure in the gas pipe to which the plug main body (1) is continuously connected is measured. it can. That is, a gas leak test can be performed. Since the first opening (C ₁ ) is an opening suitable for the pressure detection, the gas flow rate at this time is small. Therefore, when the socket (S) is connected and the valve (3) is opened,
No sudden pressure acts on the pressure detector.

When air is purged, the auxiliary shaft (6
1) is connected and the socket (S) is connected to the plug main body (1). As a result, the valve body is moved by the push rod (6) and the auxiliary shaft (61).
(3) is pushed in to the second opening (C ₂ ). This second opening
Since (C ₂ ) has an opening suitable for air purging, it is possible not only to perform air purging in the gas pipe but also to perform air purging at a relatively large flow rate.

Then, when the socket (S) is removed, the valve
In (3), the gas is shut off completely by the biasing force of the spring, and the gas is shut off.

[0010]

According to the present invention having the above configuration, the following specific effects are obtained. In this case, the flow rate of the air purge can be greatly increased as compared with the pressure detection, so that the work time required for the air purge is significantly reduced as compared with the above-described conventional example.

On the other hand, even if the socket (S) is connected to the plug main body (1) in a state where the auxiliary shaft (61) is not connected, only a small amount of gas that can be measured is passed. (6
Without 1), it is not possible to achieve a state in which a large flow rate flows through the plug main body (1). Furthermore, in this one, the socket
(S) is connected to the plug main body (1), and it becomes possible to measure the pressure.Therefore, it is necessary to rotate the closing element after the socket (S) is connected. The workability of pressure is improved.

Since only a small amount of gas flows by simply connecting the socket (S), even if the socket (S) connected to a gas stove or the like is connected to this, the amount of gas is such that combustion is possible. In addition, the inconvenience of using this as a gas stopper is also prevented. [Regarding the invention of claim 2] The invention of claim 2 relates to another invention for solving the above-mentioned problem, and the technical means therefor is described in "Plug main body with hose end (1) The first valve seat (T ₁ ) on the downstream side and the second valve seat (T ₂ ) on the upstream side of the plug main body (1) are urged in a closed state by a spring. And a first valve body (3a) and a second valve body (3b) located coaxially, and one of the first valve body (3a) and the second valve body (3b) is provided so as to protrude toward the other. And a push rod (33) which can be inserted into the second valve seat (T ₂ ), and a small hole () for communicating the upstream side and the downstream side thereof in a closed state of the second valve body (3b). 32), a socket (S) provided with a push rod (6) for opening only the first valve body (3a) when connected to the plug main body (1), and the socket (S) or the first Auxiliary shaft (61) detachably connected to valve body (3a) Consisting of
By connecting this auxiliary shaft (61), the socket (S) is mainly plugged
When connected to (1), the lengths of the auxiliary shaft (61) and the push rod (33) are set so that the first valve body (3a) and the second valve body (3b) are both fully opened. Then, the size of the small hole (32) is set so that the flow rate flowing through the small hole (32) becomes a value suitable for the pressure detection, and the first valve body (3a) and the second valve body (3b) are both fully opened. The flow rate was adjusted to a value suitable for air purging. "

In this device, when the socket (S) is connected without the auxiliary shaft (61) being connected to the push rod (6) of the socket (S) or the first valve body (3a), the push rod of the socket (S) is (6) opens only the first valve body (3a). Then, this first valve body (3
A small hole (32) is provided in the second valve body (3b) located upstream of a).
Is provided, a gas leak test can be performed by a pressure detector connected to the socket (S). In addition, this small hole (3
Since the magnitude of 2) is set so that the flow rate flowing therethrough is a value suitable for the pressure detection, there is the same safety as in the first aspect of the present invention.

When the socket (S) is connected while the auxiliary shaft (61) is connected, the first valve body (3a) is pushed in by the push rod (6) and the auxiliary shaft (61), and is fully opened. The second valve body (3b) is also fully opened from the relationship between the degree of pushing and the length of the pushing rod (33). In this state, air is purged from the gas pipe and air purge is performed. Since the flow rate at this time is set to a value suitable for air purging, the air is purged at a relatively large flow rate.

When the socket (S) is removed from the plug main body (1), the first valve body (3a) and the second valve body (3b) are closed by the urging forces respectively applied thereto. . From the above, according to the second aspect of the present invention, the first aspect is also described.
The same effect as that of the invention is achieved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] This embodiment 1 is the same as the above-described claim 1.
In the same manner as in the prior art, the present invention is used by being screwed to a branch pipe (P) or the like interposed in the middle of the pipe.

[Regarding Configuration of Each Part] Plug Main Body (1)
As shown in FIG. 2, a hose end (D) serving as a connection portion with the socket (S) is formed in a certain range from the downstream end, and is screwed to the branch pipe (P) at the upstream end. Screw barrel
(11) is provided, and the plug main body (1) is screwed to the branch pipe (P) on the outer peripheral portion between the hose end (D) and the screw cylinder (11). A hexagonal portion (12) is formed as a tool holding portion for carrying out.

The gas passage (R) formed in the plug main body (1) has a first hole (13) opening to the downstream end of the plug main body (1), and a first hole (13). 13) a second hole portion (14) which is continuous upstream of the second hole portion (14) and has a larger diameter than the second hole portion (14); 15)
Consists of The second hole portion (14) serves as a housing portion for a valve body (3) described later.

As shown in the figure, the valve element (3) is formed in a substantially cylindrical shape, and is slidably and densely fitted in the second hole (14). At the downstream end of the valve element (3), a tapered surface (36) whose diameter decreases toward the downstream side is formed, and this is formed at the downstream end of the second hole (14). It is in contact with a similarly tapered valve seat (T). At the downstream end of the valve body (3), an operating shaft (34) having a predetermined length protruding into the first hole (13) is continuously provided.
The valve (3) is opened to a predetermined degree via the operating shaft (34) by the push rod (6) of the socket (S) connected to (D). The length of the operating shaft (34) is set to such a length that the valve body (3) does not escape to the third hole (15) in the above-mentioned valve-open state. On the other hand, the upstream end of the valve body (3) protrudes into the third hole (15), and the outer peripheral portion thereof has a third hole.
Three substantially rectangular support pieces (35) (35) slidably contacting the inner peripheral surface of the hole (15) are provided in series. A compression spring (7) is interposed between the inner peripheral portions of these support pieces (35) and (35) and a screw plate (8) screwed into the upstream end of the plug main body (1). The body (3) is kept closed.

FIG. 2 shows an outer peripheral surface of the valve body (3).
As shown in FIG. 5, a pair of grooves (3
7) A (37) is formed, one end of which is open to the tapered surface (36), and the other end is open to the third hole (15).
Further, the size of these grooves (37) (37) is set to such a degree that a small amount of gas suitable for the pressure detection can pass. [Practical use] At the time of gas leak inspection, the above socket (S) connected to the pressure measuring device is connected to the hose end (D) of the plug main body (1). At this time, the push rod (6) of the socket (S) pushes the valve (3) through the operating shaft (34) to the compression spring (7).
Push against the closing force of the valve to open it,
Since the length of the operating shaft (34) is set as described above, the valve body (3) is opened as shown in FIG.
(T) and the tapered surface (36).
7) By (37), the upstream side and the downstream side of this valve element (3) are communicated. Since the grooves (37) and (37) are set to the size described above, the third hole (15) and the second hole (37) are formed.
The flow rate from (14) to the first hole (13) has a small value. That is, the opening of the valve body (3) at this time becomes the above-described first opening (C ₁ ). In this state, a gas leak inspection is performed by a pressure detector.

On the other hand, at the time of air purging, as shown in FIG. 4, a fitting rod (61a) connected to the auxiliary shaft (61) is inserted into a hole provided coaxially with the end of the operating shaft (34). )
After connecting the operating shaft (34) and the auxiliary shaft (61), the socket (S) is connected to the hose end (D). At this time, since the length of the auxiliary shaft (61) is set to be substantially the same as the length of the second hole portion (14) in the axial direction, the valve element (3) is, as shown in FIG. The second hole (14) escapes from the inside of the second hole (14) to the third hole (15), and the valve is opened more than the first opening (C ₁ ). That is,
This valve opening state is the above-described second opening degree (C ₂ ). Thereby, the air is purged at a relatively large flow rate.

[Modification] The construction of the valve element (3) employed in the first aspect of the present invention is not limited to the above-described first embodiment, and the socket is not connected to the auxiliary shaft (61). The opening when (S) is connected to the plug main body (1) is suitable for pressure detection, and the opening when the auxiliary shaft (61) is connected and the socket (S) is connected is suitable for air purging. Other configurations can be adopted as long as

In the first embodiment, the auxiliary shaft (61) is
Although (3) is attached, it may be attached to the tip of the push rod (6). [Second Embodiment] The second embodiment is similar to the second embodiment.
As shown in FIG. 6, the plug main body (1) has an upstream connecting cylinder portion (1a) that is screwed to a branch pipe (P) similar to the first embodiment. At the downstream end, this connecting tube
The hose end (D) formed separately from (1a) is screwed and connected. Further, the connection cylinder (1a) is provided with a screw cylinder (11) and a hexagonal part (12) similar to those in the first embodiment. The hose end (D) and the connection tube (1a)
The male screw tube (18) on the hose end (D) side and the female screw tube (19) on the connection tube portion (1a) are screwed together to be integrated.

At the downstream end inside the hose end (D), a tapered first valve seat whose diameter increases toward the upstream side is provided.
(T ₁ ), a similar tapered second valve seat (T ₂ ) is provided at the downstream end of the connection cylinder portion (1a), and the first valve seat is provided in a hose end (D). Thick disc-shaped first valve body corresponding to (T ₁ )
(3a) accommodates a thick disc-shaped second valve body (3b) corresponding to the second valve seat (T ₂ ) in the connection tubular portion (1a). or,
A support piece similar to that of the first embodiment is continuously provided on each valve body.
These valve elements are located coaxially. And the first
A first compression spring (71) is provided between the first support pieces (38) (38) of the valve body (3a) and the annular projection (17) constituting the second valve seat (T ₂ ).
However, a second compression spring (72) is interposed between the second support pieces (39) (39) of the second valve body (3b) and the screw plate (8) similar to that of the first embodiment, The first valve body (3a) and the second valve body (3b) are maintained in a closed state.

The second valve element (3b) is provided with a cylinder as a push rod (33) protruding toward the first valve element (3a).
A small hole (32) communicating the upstream side and the downstream side of the second valve body (3b) is provided at the deepest part in 3). The size of the small hole (32) is determined by the flow rate flowing through the small hole (32).
(37) It is set to be approximately the same as (37). [Practical use] In the case of gas leak inspection, FIG.
Connect the socket (S) connected to the pressure measuring device to the hose end (D) as shown in (1). At this time, the push rod (6) of the socket (S) pushes the first valve body (3) against the biasing force of the first compression spring (71).
a) is pushed in to open the valve, and the length of the pushing rod (33) is increased by a small gap (for example, between the pushing rod (33) and the first valve body (3a) in the valve-opened state). , About 1 to 2 mm). Thus, in the connection state of the socket (S), the first valve body (3a) is opened and the second valve body (3a) is opened.
The valve (3b) is in a closed state, and the gas pipe is connected to the second valve.
The gas leak inspection is performed by communicating with the pressure detector through the small hole (32) provided in (3b) and the opening of the first valve body (3a). And
Since the size of the small hole (32) is set as described above, the flow rate flowing through the small hole (32) is small.

At the time of air purging, the engaging cylinder (63) provided at one end of the auxiliary shaft (61) is forcibly fitted to the tip of the push rod (6), and the socket (S) is connected in this state. Plug main body (1)
8, the first valve element (3a) is pushed further than the above-mentioned opening degree, and becomes a fully opened state. At this time, the length of the push rod (33) is adjusted in the fully opened state.
3) and the first valve element (3a) are in contact with each other so that the second valve element (3b) is fully opened.
(3b) is also pushed in against the urging force of the second compression spring (72), and both the first valve body (3a) and the second valve body (3b) are fully opened. Thereby, the inside of the gas pipe is purged with air, and the flow rate at that time becomes relatively large.

[Regarding Modification] In the second embodiment, the pushing rod (33) is provided on the second valve body (3b). However, this is provided on the first valve body (3a) and the second valve is provided. You may make it protrude to a body (3b) side. Further, the pushing rod (33) is not limited to a cylindrical shape, and may be constituted by one or a plurality of rod-shaped members. In the second embodiment, the auxiliary shaft (61) is connected to the push rod (6). However, the auxiliary shaft (61) may be connected to the first valve body (3a).

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an inspection plug in a conventional example.

FIG. 2 is a cross-sectional view of Embodiment 1 of the present invention.

FIG. 3 is a cross-sectional view when this is used for detecting a pressure.

FIG. 4 is a cross-sectional view when this is used for air purging.

FIG. 5 is a sectional view taken along line XX.

FIG. 6 is a sectional view of Embodiment 2 of the present invention.

FIG. 7 is a cross-sectional view when this is used for detecting a pressure.

FIG. 8 is a sectional view when this is used for air purging.

[Explanation of symbols]

(T) ・ ・ ・ Valve seat (1) ・ ・ ・ Plug main body (3) ・ ・ ・ Valve (C ₁ ) ・ ・ ・ First opening (C ₂ ) ・ ・ ・ Second opening (S) ・· socket (6) ... push rod (61) ... auxiliary shaft (T ₁₎ ... first valve seat (T ₂₎ ... second valve seat (3a) ... first valve body (3b) ・ ・ ・ Second valve body (32) ・ ・ ・ Small hole (33) ・ ・ ・ Push rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01M 3/26 F16K 5/04 F16K 51/00 F17D 5/02

Claims (2)

(57) [Claims] A plug body having a hose end (1)
The valve body (3) built into the plug body (1) and urged to a closed state by a spring, and the valve body (3) in the state of connection to the plug body (1) are used for pressure detection. the first opening (C ₁₎ to the socket provided with the push rod for opening (6) (S), the socket (S) or the valve body (3) to detachably connected auxiliary shaft suitable (61) consists of a, is at the socket by connecting the auxiliary shaft (61) (S) to the state of being connected to the plug main body (1), the valve body (3) than said first opening (C ₁₎ A gas leak inspection plug that opens largely and opens to a second opening (C ₂ ) suitable for air purging. 2. A plug body having a hose end (1).
The first valve seat (T ₁ ) on the downstream side and the second valve seat (T ₂ ) on the upstream side of the plug main body (1) are urged in a closed state by a spring. And a first valve body (3a) and a second valve body (3b) positioned coaxially, and a first valve body (3a) or a second valve body
(3b) a push rod (33) protruding from one of them toward the other and capable of being inserted through the second valve seat (T ₂ );
In the closed state of b), only the small hole (32) for communicating the upstream side and the downstream side thereof and only the first valve body (3a) in the state of connection to the plug main body (1) are opened. A socket (S) provided with a push rod (6) to be driven, and an auxiliary shaft (61) detachably connected to the socket (S) or the first valve body (3a). When the socket (S) is connected to the plug main body (1) and the first valve body (3a) and the second valve body (3b) are both fully opened, the auxiliary shaft (61) And the length of the push rod (33), and the size of the small hole (32) is set so that the flow rate flowing through the small hole (32) becomes a value suitable for the pressure detection. A gas leak inspection plug in which the flow rate when both the valve bodies (3b) are fully opened is a value suitable for air purging.