JP2002228507A - No-blow device for gas meter replacement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a no-blow device enabling work to be safely carried out by ascertaining the air tightness of an existing pipe and by collecting residual gas in a gas meter when the gas meter is replaced. SOLUTION: This no-blow device 20 has a body part 21 with a mount port 22 and a gas collection member 30 disposed in the body part 21 in a forward/ backward movable manner. The body part 21 is formed by journaling one end of a fixed part 23 to one end of a movable part 24 so that they can be opened or closed. The collection member 30 having a needle member 40 disposed on its end part is mounted in the fixed part 23 in a forward/backward movable manner. After the no-blow device 20 is mounted on an outlet piping port 3 of the gas meter, the needle member 40 of the collection member 30 is moved forward so as to pass through a single wall part of a rubber packing 7, thus ascertaining air tightness. Thereafter, the residual gas in the gas meter is collected from a small-diameter gas passage in the needle member 40 through a large-diameter gas passage in a gas collection pipe into a gas tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a no-blow device for replacing a gas meter, which can recover a residual gas filled in an existing gas meter when the gas meter is removed from a gas pipe.

[0002]

2. Description of the Related Art In general, a gas meter in a gas pipe provided for supplying a gas is sometimes attached and detached as necessary. For example, a gas meter for indicating gas consumption must be replaced with a new gas meter when the meter certification expiration date (7 to 10 years) is approaching, so the existing gas meter is removed and a new gas meter is installed. Was supposed to.

[0003] The gas meter is usually disposed outdoors with a primary side piping port and a secondary side piping port, and a primary side piping is connected to the primary side piping port from a gas supply source via a gas plug. A secondary pipe connected to an indoor gas appliance is connected to the secondary pipe port.

[0004] Conventionally, when replacing a gas meter, first, a gas stopper disposed on the primary side pipe is closed, and then the gas meter is replaced.
After checking the air tightness of the existing piping and confirming that there was no leakage, the joints of the primary and secondary piping connected to the gas meter were loosened, the gas meter was removed, and a new gas meter was installed. . Then, after replacing the gas meter, in order to replace the air in the new gas meter with gas, an ignition check operation was performed using a gas appliance connected to the secondary pipe.

[0005]

However, when the existing gas meter is removed, the existing gas meter and the pipe are filled with the remaining gas, and if the gas meter is removed as it is, the gas in the gas meter is released to the atmosphere. And it was dangerous.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and when removing a gas meter from a gas pipe, confirms the airtightness in the existing pipe and replaces the gas meter with which the residual gas can be recovered from the existing gas meter. It is an object of the present invention to provide a no-blow device.

[0007]

In order to solve the above-mentioned problems, a no-blowing apparatus for replacing a gas meter according to the present invention is configured as follows.
That is, when removing the gas meter having the primary side piping port and the secondary side piping port from the primary side piping and the secondary side piping, the no blow device in the gas meter exchange configured to be able to collect the residual gas in the gas meter. A main body having a mounting port to be mounted on a secondary pipe port of the gas meter, and a gas recovery member disposed on the main body so as to be able to advance and retreat toward the mounting port of the main body. A needle member is provided at a tip end of the gas recovery member, and a gas passage passing through the needle member is formed in the gas recovery member, and the needle member is connected to the gas meter. It is configured such that residual gas in the gas meter can be recovered by inserting a seal member attached to the next piping port and connecting the gas passage to the mounting port. The one in which the features.

Preferably, the gas recovery member includes:
It suffices if a measuring device for measuring the gas pressure in the gas meter and the pipe and a gas collection bag for collecting gas are connected.

Further, the main body has a fixed portion and a movable portion each formed in a half-shape so that the mounting opening can be opened and closed, and the fixed portion and the movable portion are respectively formed. What is necessary is just to be pivotally supported at one end and connected to be openable and closable.

It is more preferable that the gas recovery member is screwed to the main body so as to be movable forward and backward.

[0011]

According to the present invention, the no-blow device for gas meter replacement is configured as described above, so that the mounting port of the main body surrounds the sealing member of the secondary pipe port of the existing gas meter. After the attachment, the needle member of the gas recovery member is pierced into the seal member through the mounting port, so that the gas passage of the gas recovery member is opened to the secondary pipe port of the gas meter.

When the gas passage is opened to the secondary piping port, the gas in the gas meter flows into the gas passage of the gas recovery member of the no-blow device from the secondary piping port.
The gas that has flowed into the gas passage can be collected in the gas collection bag, for example, by connecting a gas collection bag to the rear end of the gas collection member. Is removed from the primary side pipe and the secondary side pipe.

Therefore, when the gas meter is replaced, the gas in the existing gas meter can be collected without being released to the atmosphere, so that the gas replacement operation can be performed very safely. Moreover, since the recovered gas can be reused, the gas can be used efficiently.

If the measuring device and the gas collecting bag are connected to the gas collecting member in parallel via, for example, a switching valve, the switching valve is opened between the gas collecting member and the measuring device before the gas is collected. , The gas pressure of the existing pipe can be measured to check the air tightness, and at the time of gas recovery, the switching valve is operated to open the gas recovery member and the gas recovery bag, Gas can be recovered.

If the measuring device and the gas collecting bag are connected in series to the gas collecting member, the gas collecting member and the measuring device are opened before the gas is collected, and the measuring device and the gas collecting bag are not opened. In the state, the air tightness of the existing piping can be confirmed, and at the time of gas recovery, the gas recovery member, the measuring device, and the gas recovery bag are opened,
While recovering the gas in the gas recovery bag, the degree of gas recovery can be confirmed by the measuring device.

Further, this no-blowing device opens the half-fixed fixed portion and the movable portion of the main body in a state in which the existing gas meter is connected to the primary side pipe and the secondary side pipe, so that the secondary gas meter is opened. When the main body is temporarily attached to the side piping port and the main body is temporarily mounted on the secondary side piping, the main body can be mounted on the secondary side piping port by closing and fixing the fixed part and the movable part. it can. Therefore, since the no-blow device can be attached to the gas meter without removing the existing gas meter from the primary pipe and the secondary pipe, it is possible to check the gas density of the gas in the existing pipe or collect the gas without causing gas leakage from the gas meter. It becomes possible.

In addition, since the other end of the fixed portion and the other end of the movable portion, which are supported at one end, are opened and closed,
The work of mounting the no-blow device on the gas meter can be easily performed.

Further, in this no-blow device, the needle member can be inserted through the seal member by screwing the gas recovery member after the main body is attached to the secondary pipe of the gas meter. The gas recovery operation can be performed by an easy operation without being stabbed into the seal member while paying attention.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

Usually, the gas meter 1 is placed outdoors as shown in FIGS.
And a secondary pipe 6 connected to various gas appliances 11 disposed in the house. In the gas meter 1, as shown in FIG.
A primary side piping port 2 and a secondary side piping port 3 are formed on the upper surface, and the respective universal ports 8, 3 are connected to the universal joint 8, upward through rubber packings 7, 7 as sealing members.
8 are connected.

The primary pipe 5 is connected from a universal joint 8 connected to the primary pipe port 2 to a gas supply source 12 via a gas plug 4, and the secondary pipe 6 is connected to the secondary pipe port 3. A gas piping member 10 is connected from a universal joint 8 to be connected, and is connected to various gas appliances 11 arranged in a house.
In the embodiment, the elbows 9 and 9 are appropriately interposed in order to change the piping direction from the universal joints 8 and 8. However, the present invention is not limited to this.

The no-blow device 20 of the present embodiment shown in FIG.
When the gas meter 1 is replaced, the gas in the gas meter 1 is collected before the existing gas meter 1 is removed, and the universal joint 8 attached to the secondary pipe 6
After loosening the union nut 8a (see FIG. 2), the union nut 8a is attached to the secondary side piping port 3, and the needle member 40 is inserted through the rubber packing 7 to collect the residual gas in the gas meter 1. .

The configuration of the no-blow device 20 of the embodiment is as follows.
As shown in FIGS. 3 to 5, the gas meter 1 includes a main body 21 having a mounting port 22 mounted on the secondary pipe port 3, and a gas recovery member 30 mounted on the main body 21 so as to be able to advance and retreat. It is configured.

As shown in FIG. 3, the main body portion 21 is pivotally supported at one end and is configured to be openable and closable, and has fixed portions 23 having mating surfaces 231 and 241 that can abut on surfaces facing each other. It has a movable part 24. The fixed portion 23 has a half-shaped fixed-side semicircular portion 22a that can be attached to the secondary-side pipe port 3 of the gas meter 1 on a mating surface 231 with the movable portion 24. As shown in FIG. An insertion hole 232 into which the gas recovery member 30 is inserted is formed from the mating surface toward the fixed semicircular portion 22a. Further, a mating surface 23 of the fixed portion 23 and the movable portion 24
A fastening member (in this embodiment, a wing bolt 25) for fixing the movable part 24 to the fixed part 23 is attached in a state where the first and second parts 241 are in contact with each other (closed state). As shown in FIG. 5, the upper surface of the fixed portion 23 and the movable portion 24 on the side opposite to the shaft support is configured to release a part of the mounting port 22 so that the rubber packing 7 arranged in the mounting port 22 can be confirmed. , Are formed lower than the upper surface of the portion where the insertion hole 232 is formed.

The insertion hole 232 is formed with a female screw 233 from the entrance side toward the front. A small hole 235 penetrates the front end wall 234 connected to the front end of the insertion hole 232, and the fixed side semicircular portion 22a Is formed to reach.

The movable part 24 has a mating surface 2 with the fixed part 23.
31 can be attached to the secondary piping port 3 of the gas meter 1;
A movable half-circle portion 22 b in a half-shape is formed, and a female screw 242 that is screwed into a screw of the wing bolt 25 is formed on a surface of the fixed portion 23 facing the wing bolt 25. Then, the fixed-side semicircular portion 22a and the movable-side semicircular portion 22b are combined to form a perfect circular mounting opening 22.

The gas recovery member 30, as shown in FIG.
A gas recovery pipe 31 having a gas passage therein; a pipe mounting member 37 for inserting the gas recovery pipe 31 therein so that it can be fastened to the main body 21; and a gas recovery pipe connected to the gas passage in the gas recovery pipe 31 Needle member 40 disposed at the distal end of tube 31
, And is configured.

The gas recovery tube 31 has a large-diameter portion 32 having a pressed surface 321 pressed by the distal end surface of the tube mounting member 37 and a small-diameter portion 33 inserted through the inside of the tube mounting member 37. The small hole 32 through which the needle member 40 is inserted
2, a large diameter gas passage 331 connected to the small diameter gas passage 41 formed in the needle member 40 is formed in the small diameter portion 33. A gas hose 35 is connected to the base of the large-diameter gas passage 331 via a pipe fitting 34, and the gas pressure in the existing pipe is measured at the base of the gas hose 35 via a switching valve 45. Measuring device 46 and the gas collection bag 4 for collecting gas that has passed through the gas collection tube 31.
7 are connected in a bifurcated manner.

The insertion hole 23 is formed on the outer peripheral surface of the pipe mounting member 37.
2, a screw portion 38 to be screwed into the female screw 233 formed therein, a long plate-shaped handle portion 39 is formed at the base portion,
By rotating the handle 39, the gas recovery member 3
0 is able to advance and retreat with respect to the main body 21.

As shown in FIG. 6, the needle member 40 is formed in an acute angle so that the tip needle part 42 can be stabbed into the rubber packing 7. Are formed on the axis. Small diameter gas passage 41
The distal end of the needle member 40 is closed, and one or several gas opening holes 4 are provided in the outer peripheral surface of the needle member 40 near the distal end needle portion 42.
3, the small-diameter gas passage 4 of the needle member 40 is formed.
1 and the outside of the needle member 40 and the small-diameter gas passage 41.
Has been opened.

The gas opening 43 is formed so that the needle member 40 can be located inside the rubber packing 7 with the rubber packing 7 penetrating therethrough. The small-diameter gas passage 41 may be formed by hollowing the needle member 40 over its entire length. However, when the distal needle portion 42 of the needle member 40 is inserted into the rubber packing 7, the distal needle portion 42 of the needle member 40 In order to prevent the small-diameter gas passage 41 from being blocked by deformation, it is desirable to provide a gas opening 43 on the outer peripheral surface near the distal end needle portion 42 of the needle member 40 as shown in the figure.

Next, the operation of the no-blow device 20 configured as described above will be described.

When the no-blow device 20 of the embodiment is mounted on the existing gas meter 1, the union nut 8a of the universal joint 8 in the secondary pipe 6 is loosened.
At this time, since there is a possibility of causing a pitch shift between the primary pipe 5 and the secondary pipe 6, a fixing means for preventing a pitch shift between the primary pipe 5 and the secondary pipe 6 is provided. Is desirable for easy work. The fixing means is not particularly limited, but a dedicated jig may be manufactured and used.

First, as shown in FIG. 7, in a state where the primary pipe 2 and the secondary pipe 3 of the gas meter 1 are connected to the primary pipe 5 and the secondary pipe 6 as shown in FIG. Then, the union nut 8a of the universal joint 8 on the primary side is further tightened, and the union nut 8a of the universal joint 8 on the secondary side is loosened.

Next, as shown in FIG. 8, in a state where the movable portion 24 of the main body portion 21 is opened with respect to the fixed portion 23, the movable portion 24 is attached to the secondary side piping port 3 so as to surround the rubber packing 7.
The mating surface 241 of the movable portion 24 is changed to the mating surface 2 of the fixed portion 23.
31, the mounting port 22 is mounted on the secondary pipe port 3, and the wing bolt 25 is connected to the movable section 2.
4 is screwed into the female screw 242, whereby the no-blow device 20 is attached to the gas meter 1. In this state, the pipe mounting member 37 of the gas recovery member 30
Is positioned such that the needle member 40 is not stabbed into the rubber packing 7.

With the no-blow device 20 attached to the gas meter 1, first, the airtightness in the existing pipe is checked. As shown in FIGS. 10A and 10B, when the handle portion 39 of the tube mounting member 37 is rotated to advance the tube mounting member 37 forward, the tip needle portion 42 of the needle member 40 becomes The rubber gasket 7 is stabbed into the rubber portion and gradually advances (FIG. 10A), and further advances so that the gas opening 43 is located in the rubber packing 7 (in the secondary pipe opening 3). Then, it is stopped by penetrating the rubber packing 7 (FIG. 10B).

When the gas opening hole 43 is inserted into the secondary-side piping port 3, the small-diameter gas passage 41 between the secondary-side piping port 3 and the needle member 40 is opened, and residual gas in the gas meter 1 is removed by the needle. From the gas opening 43 of the member 40 to the small-diameter gas passage 4
Flow into 1.

On the other hand, in this state, the switching valve 45 connected to the gas hose 35 is
The side is opened and the gas recovery bag 47 side is closed. Therefore, the large-diameter gas passage 331 is
The residual gas flowing through the measuring device 4
6, the gas pressure in the existing pipe can be measured by the measuring device 46 after the gas stopper 4 is closed. If the gas pressure shows a predetermined value within a certain time,
This means that the airtightness in the existing piping is maintained.

Next, a recovery operation of the residual gas is performed. When the airtightness is confirmed, the switching valve 45 is operated to close the measuring device 46 side and release the gas collection bag 47 side.

Since the residual gas released by the operation of the switching valve 45 flows toward the gas recovery bag 47, the small-diameter gas passage 41 and the large-diameter gas passage 331 pass through the gas opening 43.
And is collected from the gas hose 35 into the gas collection bag 47.

Since it is possible to confirm that the residual gas in the gas meter 1 has been almost recovered by the gas pressure in the gas meter 1 reaching the atmospheric pressure, the main body 21 of the no-blow device 20 is removed at that time. The fixed part 23 and the movable part 24 are opened and removed, and the gas meter 1 is removed from the primary pipe 5 and the secondary pipe 6 and replaced with a new gas meter.

In addition, without confirming the airtightness,
When performing gas recovery work, the gas hose 35
After the no-blower device 20 is attached to the secondary pipe opening 3 of the gas meter 1 in a state in which the gas collection bag 47 is opened, the open gas tap 4 is closed, and the needle member 40 is inserted into the rubber packing 7. It is preferable for safety to insert.

Further, in the above embodiment, the gas recovery member 3
Switching the measuring device 46 and the gas recovery bag 47 to 0
5, the measuring device 46 may be connected to the gas collecting member 30, and the gas collecting bag 47 may be connected to the measuring device 46 in series. In this case,
Before the gas collection, the gas collection member 30 and the measuring device 46 are opened, and the airtightness of the existing piping can be checked in a state where the measuring device 46 and the gas collection bag 47 are not opened. At times, the gas recovery member 30
And the measurement device 46 and the gas collection bag 47 are opened,
Measuring device 46 while collecting gas in gas collection bag 47
, The degree of gas recovery can be confirmed.

As described above, after the mounting port 22 of the main body 21 is attached to the secondary pipe port 3 of the existing gas meter 1 so as to surround the rubber packing 7, the needle member 40 is attached to the rubber section of the rubber packing 7. By inserting the gas recovery member 3
The gas passage of No. 0 can be opened to the secondary side piping port 3, and the residual gas can be collected in the gas collection bag 47 from the needle member 40 via the gas hose 35.

Therefore, when the gas meter is replaced, the gas in the existing gas meter 1 can be recovered without being released to the atmosphere, so that the gas replacement operation can be performed extremely safely. Moreover, the recovered gas can be reused, so that the gas can be used efficiently.

Further, by connecting the measuring device 46 and the gas collecting bag 47 to the gas collecting member 30, the gas collecting member 30 and the measuring device 46 are operated before the gas is collected, so that the existing piping can be connected. The gas pressure can be measured to confirm the air tightness, and at the time of gas recovery, the gas can be recovered by operating the gas recovery member 30 and the gas recovery bag 47 to be opened.

Further, the no-blow device 20 is configured such that the existing gas meter 1 is connected to the primary side pipe 5 and the secondary side pipe 6 and the half-shaped fixed part 23 and the movable part 24 of the main body 21 are connected to each other. The main body 21 is temporarily attached to the secondary pipe port 3 by opening the opening, and when the main body section 21 is temporarily attached to the secondary pipe port 3, the fixed portion 23 and the movable portion 24 are closed and fixed. Thereby, the main body 21 can be attached to the secondary-side piping port 3. Therefore, the no-blow device 20 can be attached to the gas meter 1 without removing the existing gas meter 1 from the primary side pipe 5 and the secondary side pipe 6,
It is possible to confirm the gas density of the gas in the existing pipe or to collect the gas without causing a gas leak from the gas meter 1.

In addition, the fixed portion 23 supported at one end
And the other end of the movable part 24 is opened and closed, so that the work of mounting the no-blow device 20 to the gas meter 1 can be easily performed.

In the no-blow apparatus 20, the needle member 40 can be inserted through the rubber packing 7 by attaching the main body 21 to the secondary pipe port 3 of the gas meter 1 and then screwing the gas recovery member 37. Because it is possible, pay attention to the tip of the needle
It is possible to perform the gas recovery operation by an easy operation without inserting the gas recovery device.

The no-blowing device of the present invention is not limited to the above-described embodiment. For example, if the fixed portion and the movable portion of the main body are configured to be openable and closable, as described above, For example, the divided fixed part and movable part may be connected to each other with bolts on both sides of the semicircular part, and may be provided with an engaging part and detachable. May be.

The form of the gas recovery pipe and the pipe mounting member is not limited to the above-described form, as long as the gas recovery member has a needle member penetrating the seal member and a gas passage formed therein.

[Brief description of the drawings]

FIG. 1 is a simplified diagram showing a state in which a gas meter is piped.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a plan view of a no-blow device showing one embodiment of the present invention.

FIG. 4 is a front sectional view of the same.

FIG. 5 is a side view of the same.

FIG. 6 is an enlarged sectional view showing the needle member.

FIG. 7 is a front view showing a state where a union nut of a secondary side piping port is loosened.

FIG. 8 is a plan view showing a state in which a movable portion of the no-blow device is released from a fixed portion.

FIG. 9 is a cross-sectional view showing a state in which a no-blow device is attached to a secondary-side piping port.

FIG. 10 is a cross-sectional view showing a state where the needle member has inserted rubber packing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Gas meter 2 ... Primary side piping port 3 ... Secondary side piping port 5 ... Primary side piping 6 ... Secondary side piping 7 ... Rubber packing (seal member) 8 ... Universal joint 20 ... No blow device 21 ... Main body 22 ... Installation Mouth 23 ... Fixed part 24 ... Movable part 30 ... Gas recovery member 31 ... Gas recovery pipe 331 ... Large diameter gas passage 37 ... Pipe mounting member 40 ... Needle member 41 ... Small diameter gas passage 45 ... Switching valve 46 ... Measuring device 47 ... Gas Collection bag

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideki Ogi 1-35 Oise-cho, Nakagawa-ku, Nagoya City, Aichi Prefecture Inside Asahi Seiki Co., Ltd. (72) Inventor Miyuki 1-35 Oise-cho, Nakagawa-ku, Nagoya City, Aichi Prefecture Asahi Seiki Co., Ltd. F-term (reference) 2F030 CC13 CF14 CF15 CF20

Claims (4)

[Claims] A gas meter having a primary pipe port and a secondary pipe port, wherein the gas meter is configured to be able to collect residual gas in the gas meter when the gas meter is removed from the primary pipe and the secondary pipe. A main body having a mounting port to be mounted on a secondary pipe port of the gas meter, and a gas recovery member disposed on the main body so as to be able to advance and retreat toward the mounting port of the main body. A needle member is provided at a distal end portion of the gas recovery member, and a gas passage passing through the needle member is formed in the gas recovery member. It is configured such that residual gas in the gas meter can be collected by inserting a seal member attached to a secondary pipe opening of the gas meter and connecting the gas passage to the attachment port. No blow device for gas meter replacement. 2. The gas meter replacement according to claim 1, wherein a measuring device for measuring a gas pressure in the gas meter and a pipe and a gas collecting bag for collecting gas are connected to the gas collecting member. No blow device. 3. The main body has a fixed part and a movable part each formed in a half-shape so that the mounting opening is formed to be openable and closable, and the fixed part and the movable part are respectively formed. 2. The no-blow apparatus according to claim 1, wherein the apparatus is pivotally supported at one end and connected so as to be openable and closable. 4. The no-blow device in gas meter exchange according to claim 1, wherein the gas recovery member is screwed to the main body so as to be movable forward and backward.