JP7061530B2 - Pressure inspection device and pressure inspection method - Google Patents

Description

The present invention relates to a pressure inspection device and a pressure inspection method, and in particular, a pressure inspection device capable of inspecting the airtightness of an inspected body based on the pressure difference between the inspected body and a reference body to which a pressurized fluid is supplied. And the pressure inspection method.

Conventionally, as a method of inspecting the airtightness of a pipeline (for example, a gas pipe), after supplying a fluid (for example, air) of a predetermined pressure to the pipeline, a pressure change (pressure decrease) with the passage of time is confirmed. By doing so, a method for determining whether or not a leak has occurred in the pipeline is widely known.

However, in general, when the temperature of such a fluid changes due to the influence of the ambient temperature (for example, atmospheric temperature or ground temperature), the pressure also changes accordingly, so that the piping as an inspection target is particularly suitable. If the length is long, not only the inspection accuracy is lowered, but also the presence or absence of leakage cannot be determined in some cases, and as a result, the inspection time becomes long.

Therefore, in order to solve such a problem, for example, the technique described in Patent Document 1 has been proposed.

The inspection method of Patent Document 1 is
(A) Pressurize the fluid existing in the pipeline,
(B) The pressure of the pressurized fluid is measured, and the fluid temperature is measured by thermometers provided at a plurality of points in the inspection section.
(C) The measured fluid temperature is averaged to obtain the averaged fluid temperature.
(D) Obtain the pressure change in the inspection section based on the averaged fluid temperature.
(E) Obtain the fluid temperature correction pressure based on the pressure change in the inspection section.
(F) The presence or absence of leakage is determined by comparing the fluid temperature correction pressure with a predetermined threshold value.
It is configured to take steps such as.

According to such a technique, since the pressure value is corrected based on the fluid temperature, it is possible to perform a highly accurate inspection while shortening the inspection time.

Japanese Unexamined Patent Publication No. 2001-027576

However, in the inspection method of Patent Document 1, the pressure value is corrected based on the fluid temperature measured at a plurality of points in the inspection section, so that the thermometer is in an inappropriate position for obtaining the fluid temperature. If it is provided, there arises a problem that the proper pressure value is not corrected and the presence or absence of leakage is erroneously determined.

Such a problem can be solved by installing a large number of thermometers in the pipeline.

However, if a large number of thermometers are installed, in addition to the installation work of the thermometers, the instrumentation work associated with them must be performed, which not only increases the equipment burden, but also the pipeline and the thermometers. This leads to problems such as an increased risk of fluid leaking from the connection part of the.

The present invention has been made to solve such a problem, and an object thereof is to shorten the inspection time by suppressing the influence of the fluid temperature without increasing the load on the equipment. , To provide a pressure inspection device and a pressure inspection method capable of performing highly accurate leak inspection.

According to the pressure inspection device according to the present invention, the above-mentioned problem is a pressure inspection device for inspecting the airtightness of the internal space of the object to be inspected, the sealing member for closing the opening communicating with the internal space, and the inside. The pressure difference between the reference body having a closed space into which the pressurized fluid supplied to the space can be introduced and the pressure of the pressurized fluid in the internal space and the pressure of the pressurized fluid in the enclosed space is measured. The reference body is provided with a measuring device capable of being capable of being provided, and the reference body is provided in the sealing member and comes into contact with the pressurized fluid existing in the internal space with the opening closed by the sealing member. It has a contact portion, and the contact portion is made of a material having thermal conductivity to transfer the heat of the pressurized fluid existing in the internal space to the pressurized fluid existing in the enclosed space. Will be done.

Similarly, according to the pressure inspection method according to the present invention, the above-mentioned subject is a pressure inspection method for inspecting the airtightness of the internal space of the object to be inspected by using the pressure inspection apparatus, and the pressure inspection apparatus is the above-mentioned. A reference body having a closed member that closes an opening communicating with the internal space, a closed space into which the pressurized fluid supplied to the internal space can be introduced, and the pressure of the pressurized fluid in the internal space and the closed space. A measuring device capable of measuring a pressure difference from the pressure of the pressurized fluid in the inside is provided, an opening closing step of closing the opening with the sealing member, and the pressurized fluid in the internal space. Inspected body pressurizing step, a reference body pressurizing step of introducing the pressurized fluid into the closed space, and the addition in the internal space supplied by performing the inspected body pressurizing step. A differential pressure measuring step of measuring the pressure difference between the pressure of the pressure fluid and the pressure of the pressurized fluid in the closed space introduced by performing the reference body pressurizing step by using the measuring device. The reference body has a contact portion provided in the sealing member and in contact with the pressurized fluid existing in the internal space in a state where the opening is closed by the sealing member. The part is also solved by being made of a material having thermal conductivity to transfer the heat of the pressurized fluid existing in the internal space to the pressurized fluid existing in the enclosed space.

The term "pressurized fluid" as used herein means that a fluid that can be pressurized by using a pressurizing device (for example, a pressurizing pump) is broadly included, and if it is a gas, for example, air. If the combustible gas is also a liquid, for example, water or oil is applicable.

Further, the above-mentioned "sealing member" is not limited to a plate-shaped member (for example, a closing flange) as long as it is a member capable of closing the "opening" of the object to be inspected (for example, a pipeline or a container). For example, a bottomed cylinder is also applicable.

Further, the "contact portion" of the "reference body" is formed of a member capable of transferring the heat of the fluid existing in the "internal space" of the "inspected body" to the "sealed space" inside the "contact part". However, considering the above-mentioned "thermal conductivity", it is desirable that the member is made of a member having a high thermal conductivity (for example, copper, silver and gold).

In the above configuration, when the fluid temperature in the "internal space" changes while the same fluid is enclosed in the "internal space" of the "inspected object" and the "closed space" of the "reference body", respectively. The "reference body" functions as if it were a heat exchanger, and its heat is transferred to the fluid in the "closed space" through the "contact portion".

Therefore, in the above configuration, the fluid temperature existing in the "internal space" of the "inspected object" and the fluid temperature existing in the "closed space" of the "reference body" are automatically and quickly set. , It is possible to have the same temperature.

Therefore, in the above configuration, the presence or absence of leakage of the "inspected object" can be inspected simply by checking the pressure difference (differential pressure) between the "internal space" and the "closed space".

Further, in the above configuration, since it is not necessary to perform complicated control such as temperature compensation, no equipment burden is incurred.

As described above, according to the present invention provided with the above configuration, highly accurate leak inspection can be performed in a short time without incurring a burden on equipment.

In the invention relating to the pressure inspection device, the sealing member is continuously provided at the connection portion connected to the opening and the connection portion, and the pressurized fluid existing in the internal space is introduced. It is preferable that the contact portion has a hollow portion to be formed, and at least a part thereof is arranged in the hollow portion.
In this case, it is preferable that the pressure inspection device further includes a switchgear that can move between an open position that communicates the space in the hollow portion and the closed space and a closed position that does not communicate with each other. When such a switchgear is provided, the pressure inspection device further includes a bypass pipeline connecting the space in the hollow portion and the closed space, and the switchgear is provided in the bypass pipeline. Is more suitable.
Alternatively, the pressure inspection device includes an opening / closing device that can move between an open position that communicates the internal space and the closed space and a closed position that makes the closed space non-communication, and the internal space and the closed space. It is preferable that the opening / closing device is provided in the bypass pipeline, further comprising a bypass pipeline connecting the space.

Further, in the invention relating to the pressure inspection device, the contact portion may be configured to be arranged in the internal space with the opening portion closed by the sealing member.
In this case, it is preferable that the pressure inspection device further includes a switchgear that can move between an open position that communicates the internal space and the closed space and a closed position that makes the closed space non-communication.
In addition to this, it is more preferable that the pressure inspection device further includes a bypass pipe connecting the internal space and the closed space, and the switchgear is provided in the bypass pipe.

Further, in the invention according to the pressure inspection method, the pressure inspection device is a switchgear that can move between an open position that makes the internal space and the closed space communicate with each other and a closed position that makes the internal space non-communication state. It is preferable that at least one of the inspected body pressurizing step and the reference body pressurizing step includes a step of moving the switchgear from the closed position to the open position.

As described above, according to the pressure inspection device and the pressure inspection method according to the present invention, it is possible to perform highly accurate leak inspection in a short time without causing a burden on equipment even though it has a simple configuration.

It is a side view which shows an example of the pressure inspection apparatus which concerns on this embodiment. It is a flow chart which shows an example of the pressure inspection method concerning this embodiment. It is a side view which shows the other example of a pressure inspection apparatus. It is a side view which shows still another example of a pressure inspection apparatus. It is a side view which shows still another example of a pressure inspection apparatus. It is a side view which shows still another example of a pressure inspection apparatus.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an example of a pressure inspection device according to the present embodiment, and FIG. 2 is a flow chart showing an example of a pressure inspection method according to the present embodiment.

FIG. 1 shows the airtightness of a pipe line PL provided with a gas pipe P and a gas plug GV connected to the gas pipe P using the pressure inspection device 1 according to the present embodiment (airtightness test or leak test, hereinafter, “ It is called "pressure inspection"). The pipeline PL and the pressure inspection device 1 correspond to the "inspected object" and the "pressure inspection device" described in the claims, respectively. Further, in the following, the case of inspecting the airtightness of the pipeline PL will be described as an example, but the present invention can also be applied to the case of inspecting other objects to be inspected (for example, a container). Of course.

First, the pipeline PL according to the present embodiment will be described with reference to FIG.
As shown in FIG. 1, the gas pipe P constituting the pipeline PL is composed of a pipe member (for example, a steel pipe having a diameter of 80 mm to 100 mm, a cast iron pipe or a polyethylene pipe), and is combustible supplied from a main gas supply line. It is a pipe for leading out sex gas (city gas in this embodiment) to a gas meter (not shown) or the like.

A branch joint (so-called cheese) T is provided at a predetermined position in the pipeline PL, and a gas plug GV is attached to the branch portion of the branch joint T via a gas pipe P (for example, a steel pipe having a diameter of 50 mm). ing. In this embodiment, a "pressure inspection" (inspection of airtightness) is performed for the gas pipe P, the gas plug GV, and the temporary pipe TP described later as inspection targets.

As will be described later, a temporary pipe TP (for example, a steel pipe having a diameter of 50 mm) for connecting the tubular member 10 of the pressure inspection device 1 when performing a “pressure inspection” is connected to the connection port on the downstream side of the gas plug GV. Is now connected. The temporary piping TP also falls under the "inspected body" described in the claims.

Next, the pressure inspection device 1 according to the present embodiment will be described with reference to FIG.
As shown in FIG. 1, the pressure inspection device 1 includes a tubular member 10, a reference body 20, a pressure measuring device 30, an inspected body side pipe 40, a reference body side pipe 50, a bypass pipe 60, and an on-off valve. It is equipped with 70. The tubular member 10, the reference body 20, the pressure measuring device 30, the bypass pipe 60, and the on-off valve 70 are the "sealing member" and the "reference body" described in the claims, respectively. , "Pressure measuring device", "Bypass pipeline", and "Opening / closing device".

The tubular member 10 is made of a metal pipe member (for example, a steel pipe having a diameter of 50 mm), and flange joints 11 and 12, respectively, are joined to both ends thereof by welding or the like.
Further, the pipe 40 on the side to be inspected is connected to the tubular member 10 by welding or the like so as to branch from the middle of the pipeline.

The tubular member 10 can be attached to the pipeline PL by bolting the flange joint TF and the flange joint 11 provided in the temporary pipe TP with a gasket (not shown) interposed therebetween. There is. The flange joint TF and the flange joint 11 correspond to the "opening portion" and the "connection portion" described in the claims, respectively.

A flange joint (so-called closed flange) 13 is attached to the flange joint 12 with a gasket (not shown) interposed therebetween.

A through joint (for example, a so-called socket having a diameter of 10 mm) 13a on which an internal thread is formed is joined to the flange joint 13 by welding or the like while penetrating in the plate thickness direction.
As will be described in detail later, the through joint 13a is connected to the reference body 20 on one end side thereof and the reference body side pipe 50 on the other side by screw joining or welding joining, respectively. There is.

The reference body 20 is made of a metal (for example, copper, silver and gold) pipe member having high thermal conductivity, and has one end connected to the through joint 13a of the flange joint 13 and the other end closed. ing. The space in the reference body 20 corresponds to the "closed space" and the "hollow portion" described in the claims.

The reference body 20 is formed in a coil shape, and is arranged inside the tubular member 10 by connecting the flange joint 13 to the flange joint 12 in a state of being connected to the through joint 13a. The exposed portion of the standard body 20 inside the tubular member 10 corresponds to the "contact portion" described in the claims.

In the present embodiment, the reference body 20 is formed in a coil shape, but may be formed in a wavy shape like a heat exchange pipe provided in a radiator of an automobile, or may be formed in another shape (for example). For example, it can be formed into a spherical shape.
As will be described in detail later, since the main function of the reference body 20 is to transfer the temperature (heat) of the fluid existing in the pipeline PL to the fluid existing inside the reference body 20, the reference body 20 is heat-transferred. In addition to being formed of a member having a high rate (copper, silver and gold described above), it is desirable to form a shape having a large surface area, for example, a coil shape or a wavy shape.

The pressure measuring device 30 has a pressure gauge 30A on the inspected body side for measuring the fluid pressure in the pipeline PL, and a pressure gauge 30B on the reference body side for measuring the fluid pressure in the reference body 20.
In the present embodiment, a so-called mechanical self-recording pressure gauge is adopted as both the pressure gauge 30A on the inspected body side and the pressure gauge 30B on the reference body side. Since such a mechanical self-recording pressure gauge is now known, detailed description thereof will be omitted, but also in the present embodiment, by setting a recording paper (chart paper), changes in fluid pressure over time are recorded. You can do it.

Although details will be described later, in the present embodiment, the pressure value measured by the pressure gauge 30A on the inspected body side (the pressure value recorded on the recording paper) and the pressure value measured by the pressure gauge 30B on the reference body side (on the recording paper). By comparing with the recorded pressure value), the presence or absence of leakage of the pipeline PL can be determined.

In the present embodiment, as the pressure measuring device 30, a pressure gauge of a type for recording on a recording paper is used, but another type of pressure gauge, for example, an electric pressure gauge can also be used. Further, in the following, a case where the fluid pressure in the pipeline PL and the fluid pressure in the reference body 20 are measured by separate pressure gauges will be described as an example, but these fluid pressures are measured by one pressure gauge. It doesn't matter. In this case, for example, a known "differential pressure gauge" may be used.

The pipe 40 on the side to be inspected is made of a metal pipe member (for example, a steel pipe having a diameter of 10 mm), one end of which is connected to the tubular member 10, and the other end of which a hose connection joint 40a is joined by welding or the like. ing. The hose connection joint 40a is for detachably connecting the pressure resistant hose 41. In the present embodiment, one end of the pipe 40 on the side to be inspected is connected to the tubular member 10, but instead, it can be connected to the gas pipe P or the temporary pipe TP.

In the present embodiment, the inspected body side pipe 40 is connected to the inspected body side pressure gauge 30A via a pressure resistant hose 41, a three-pronged joint 42 with an on-off valve, and a pressure resistant hose 43.

The three-pronged joint 42 with an on-off valve is a so-called three-pronged cock provided with "three" hose connection ports, and can move between an "open position" that allows fluid flow and a "closed position" that blocks fluid flow. It is equipped with an on-off valve.
A pressurizing device 80 is connected to the hose connection port on the on-off valve side of the three-pronged joint 42 with an on-off valve via a pressure-resistant hose 44.

The pressurizing device 80 is a device capable of increasing the fluid (“air” in the present embodiment) existing in the pipeline PL to a predetermined pressure (so-called “double ball pump” in the present embodiment).
In the present embodiment, the pressurizing device 80 uses a manual type, but an electric type (pressurizing pump) can also be used.
Further, such a pressurizing device 80 is not limited to the case where it is connected to the pipe 40 side on the inspected body side as in the present embodiment, but may be connected to the pipe 50 side on the reference body side, and is directly connected to the pipeline PL. You may.

Similar to the inspected body side pipe 40, the reference body side pipe 50 is made of a metal pipe member (for example, a steel pipe having a diameter of 10 mm), one end of which is connected to the through joint 13a, and the other end of which is a hose connection joint. 50a is joined by welding or the like. The hose connection joint 50a is for detachably connecting the pressure resistant hose 51.

In the present embodiment, the reference body side pipe 50 is connected to the reference body side pressure gauge 30B via the pressure resistant hose 51.

The bypass pipe 60 is made of a metal pipe member (for example, a steel pipe having a diameter of 10 mm), and is a pipe for communicating the pipe line PL and the reference body 20.
In the bypass pipe 60 according to the present embodiment, the pipeline PL and the reference body 20 are communicated with each other by connecting the pipe 40 on the inspected body side and the pipe 50 on the reference body side.

The on-off valve 70 is provided in the middle of the bypass pipe 60 and is configured to be movable between an “open position” that allows fluid flow and a “closed position” that shuts off the flow.

Next, the work procedure (pressure inspection method) of the “pressure inspection” of the pipeline PL will be described with reference to FIGS. 1 and 2. In the following, it is assumed that the pipeline PL extending in the left-right direction is blocked in FIG. 1.

As shown in FIG. 2, the pressure inspection method according to the present embodiment includes a pressure inspection device mounting step S1, an inspected object pressurizing step S2, a reference body pressurizing step S3, and a differential pressure measuring step S4. ing. The pressure inspection device mounting step S1, the inspected object pressurizing step S2, the reference body pressurizing step S3, and the differential pressure measuring step S4 are described in the scope of the patent claim, respectively. , "Inspected body pressurization step", "reference body pressurization step", and "differential pressure measurement step".

(Pressure inspection device mounting process S1)
In the pressure inspection device mounting step S1, as shown in FIGS. 1 and 2, the pressure inspection device 1 is mounted on the pipeline PL.

Specifically, in the pressure inspection device mounting step S1,
(A) First, connect the temporary pipe TP to the downstream side of the gas plug GV.
(B) Next, the flange joint 11 of the tubular member 10 is connected to the flange joint TF of the temporary pipe TP with the gasket interposed therebetween.
(C) The pressure gauge 30A on the inspected object side is connected to the pipe 40 on the inspected object side (joint for connecting the hose 40a) via the pressure resistant hose 41, the three-pronged joint 42 with an on-off valve, and the pressure resistant hose 43.
(D) A pressurizing device 80 is connected to the hose connection port on the on-off valve side of the three-pronged joint 42 with an on-off valve via a pressure-resistant hose 44.
(E) The reference body side pressure gauge 30B is connected to the reference body side pipe 50 (hose connection joint 50a) via the pressure resistant hose 51.
(The above (c) to (e) are in no particular order).

The pressure inspection device mounting step S1 is completed by performing the above-mentioned work, and then the inspected body pressurizing step S2 is performed. In the following, all of the gas plug GV, the on-off valve 70, and the on-off valve of the three-pronged joint 42 with the on-off valve are located in the "closed position" in the state where the pressure inspection device mounting step S1 is performed. Will be explained on the premise of.

(Inspected Body Pressurization Step S2)
In the body pressurization step S2 to be inspected, the work of increasing the fluid pressure (air pressure) in the pipeline PL to a predetermined pressure is performed.

Specifically, in the subject pressurizing step S2,
(A) First, the on-off valve of the gas plug GV and the three-pronged joint 42 with an on-off valve are moved from the “closed position” to the “open position”, respectively.
(B) Next, while checking the pressure gauge 30A on the side to be inspected, the pressurizing device 80 (“double ball pump” in this embodiment) is operated to reduce the fluid pressure in the pipeline PL to a predetermined pressure (for example). , "10 kPa"),
Do the work such as.

The inspected body pressurizing step S2 is completed by performing the above-mentioned work, and then the reference body pressurizing step S3 is performed.

(Reference body pressurization step S3)
In the reference body pressurizing step S3, work is performed to make the fluid pressure (air pressure) in the reference body 20 the same as the fluid pressure in the pipeline PL.

Specifically, in the reference body pressurizing step S3, first, the work of moving the on-off valve 70 from the “closed position” to the “open position” is performed. As a result, the fluids existing in the pipeline PL flow into the reference body 20, so that the pressures of these fluids are the same. Whether or not these fluid pressures are the same can be confirmed by looking at the pressure gauge 30A on the inspected body side and the pressure gauge 30B on the reference body side.

Next, in the reference body pressurizing step S3, after performing such confirmation, the work of moving the on-off valve 70 from the “open position” to the “closed position” is performed. As a result, the fluid pressure in the pipeline PL is individually measured by the pressure gauge 30A on the inspected body side, and the fluid pressure in the reference body 20 is individually measured by the pressure gauge 30B on the reference body side.

The reference body pressurizing step S3 is completed by performing the above-mentioned work, and then the differential pressure measuring step S4 is performed. In the present embodiment, the reference body pressurizing step S3 is performed after the inspected body pressurizing step S2, but these can also be performed at the same time. In this case, the work of raising the fluid pressure in the pipeline PL to a predetermined pressure while the on-off valve 70 is in the “open position” (the same work as in the above-mentioned “inspected object pressurizing step S2”). You just have to do.

(Differential pressure measurement step S4)
In the differential pressure measuring step S4, it is confirmed whether or not the pressure value of the fluid pressure in the pipeline PL is lower than the pressure value of the fluid pressure in the reference body 20, that is, whether or not there is a leak in the pipeline PL. Do the work to confirm.

Specifically, in the differential pressure measuring step S4,
(A) The pressure gauge 30A on the subject side and the pressure gauge 30B on the reference body side are operated simultaneously (almost simultaneously) (the recording paper is rotated), and the change over time of the fluid pressure is recorded on each set recording paper. do,
(B) After a predetermined time (for example, 1 hour) has elapsed, the recording papers are taken out from each of the pressure gauge 30A on the inspected body side and the pressure gauge 30B on the reference body side, and these are compared.
(C) Determine whether or not there is a leak in the pipeline PL according to the result of the comparison.
Do the work such as.

Here, the determination of the presence or absence of leakage in the differential pressure measuring step S4 will be specifically described.
First, the function (action) of the reference body 20 will be described.
As described above, since the reference body 20 is formed of a member having a high thermal conductivity, it is possible to satisfactorily transfer the heat around the reference body 20 to the internal space through the pipe wall.
In this respect, in the present embodiment, since the reference body 20 is arranged in the tubular member 10 filled with the fluid on the pipeline PL side, the fluid temperature on the pipeline PL side is affected by the ambient temperature. It can be said that the fluid temperature inside the fluid temperature is changed accordingly.
Then, in the present embodiment, it can be considered that the fluid temperature in the pipeline PL and the fluid temperature in the reference body 20 are displaced in the same manner at substantially the same timing. Therefore, only these pressure differences and pressure displacements can be seen. If confirmed, it is possible to determine whether or not the pipeline PL is leaking.

Therefore, in the differential pressure measuring step S4, as a result of comparing the changes in the fluid pressure recorded on the recording papers of the pressure gauge 30A on the inspected body side and the pressure gauge 30B on the reference body side,
-If the difference between the fluid pressure value in the pipeline PL and the fluid pressure value in the reference body 20 gradually increases, it can be determined that a leak has occurred in the pipeline PL. on the other hand,
If there is no difference between the value of the fluid pressure in the pipeline PL and the value of the fluid pressure in the reference body 20 or it is not large, it can be determined that there is no leakage in the pipeline PL. Is.

This pressure inspection method is completed by performing the above-mentioned differential pressure measuring step S4.

As described above, according to the present embodiment,
(A) Since it is not necessary to perform complicated control such as temperature compensation, there is no equipment burden and there is no need to perform equipment burden.
(B) Even if the fluid temperature in the pipeline PL changes, the inspection result is not affected (almost no), so it is possible to perform a highly accurate "pressure inspection" in a relatively short time. ..

In this embodiment, "air" is used as the fluid to be pressurized in the "pressure test", but for example, another gas (for example, "flammable gas") may be used and is limited to the gas. Instead, liquids (eg, "water" or "oil") can also be used.

Further, the connection form of the pipe such as the bypass pipe is not limited to the case of the pressure inspection device 1 shown in FIG. 1 (hereinafter, this form is referred to as “first embodiment”), and the pressure inspection device shown in FIG. It is possible to make appropriate changes such as 101 (hereinafter, this is referred to as “second embodiment”). Since the "first embodiment" and the "second embodiment" have different pipe connection forms and the same other configurations, they are designated by the same reference numerals and the description of these embodiments will be omitted. do.

Further, in the "first embodiment" and the "second embodiment", the other end of the reference body 20 is closed so that the fluid does not flow. For example, the pressure inspection device 201 (hereinafter referred to as FIG. 4) shown in FIG. , This is referred to as a "third embodiment"), and it is also possible to connect a pipe to each of both ends of the reference body 220 so that the fluid can flow.

Hereinafter, the pressure inspection device 201 configured in this way will be described. Hereinafter, the same configurations as those of the "first embodiment" and the "second embodiment" are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 4, the pressure inspection device 201 according to the present embodiment includes a reference body 220 and a bypass pipe 260.

Similar to the "first embodiment" and the "second embodiment", the reference body 220 is made of a metal (for example, copper, silver and gold) pipe member having a high thermal conductivity, and is connected to the through joint 13a. It has one end and the other end connected to the bypass pipe 260 (downstream side bypass pipe 260B described later). The other end of the reference body 220 and the downstream bypass pipe 260B are connected by penetrating the pipe wall of the tubular member 10 in an airtight state.

The bypass pipe 260 has an upstream side bypass pipe 260A communicating with the tubular member 10 and a downstream side bypass pipe 260B communicating with the reference body 220, and the upstream side bypass pipe 260A and the downstream side bypass pipe 260B open and close. It is designed to be connected via a valve 70.

In the present embodiment configured as described above, by moving the on-off valve 70 from the “closed position” to the “open position”, the fluid in the tubular member 10 is passed through the bypass pipe 260 and the reference body 220. It is possible to flow through the reference body side pipe 50.

In the above-mentioned "first embodiment" to "third embodiment", the on-off valve (on-off valve 70) that separates the pipeline PL and the reference body 20 is arranged outside the tubular member. It is also possible to arrange it inside the tubular member 310 as in the pressure inspection device 301 shown in 5 (hereinafter, this is referred to as a “fourth embodiment”).

Hereinafter, the pressure inspection device 301 configured in this way will be described. Since the "fourth embodiment" has a different arrangement position of the on-off valve from the "first embodiment" and the other configurations are the same, the same reference numerals are given to the same configurations as the "first embodiment". The explanation is omitted.

As shown in FIG. 5, the tubular member 310 according to the present embodiment is made of a metal pipe member (for example, a steel pipe having a diameter of 50 mm), and in the middle of the pipeline, the pipe to be inspected as a branch pipeline 340. Is joined by welding or the like. As in the "first embodiment", the inspected body side pipe 340 is connected to the inspected body side pressure gauge 30A via a hose connection joint 340a, a pressure resistant hose 41, a three-pronged joint 42 with an on-off valve, and a pressure resistant hose 43. Is connected (see FIG. 1).

Further, a through hole 310a capable of penetrating a body portion 370A for accommodating a valve rod (not shown) of the on-off valve 370 is formed in a predetermined position on the pipe wall of the tubular member 310.

The on-off valve 370 is a so-called gate valve that can move between the "valve opening position" and the "valve closing position" by rotating the handle portion 370B, and the connection port on one of them will be described later. The other end of the reference body 320 is connected by welding or the like. In this embodiment, the other connection port is arranged so as to open inside the tubular member 310.

The on-off valve 370 is joined to the tubular member 310 in an airtight state by welding or the like through the through hole 310a with the body portion 370A penetrating the through hole 310a. ..

The reference body 320 is made of a metal (for example, copper, silver and gold) pipe member having high thermal conductivity, and has one end connected to one end of the through joint 13a of the flange joint 13 and an on-off valve 370. It has the other end to be connected.

A reference body side pipe 50 is connected to the other end of the through joint 13a. As in the "first embodiment", the reference body side pressure gauge 30B is connected to the reference body side pipe 50 via the hose connection joint 50a and the pressure resistant hose 51.

In the present embodiment configured as described above, by operating the handle portion 370B of the on-off valve 370 attached to the tubular member 310, for example, the “reference body pressurizing step S3” (reference) as shown in FIG. It is possible to perform the work of switching between the introduced state in which the pressurized fluid is introduced into the body 320 and the non-introduced state in which the pressurized fluid is not introduced).

In the above-mentioned "first embodiment" to "fourth embodiment", the tubular member 10 or the tubular member 310 is used as the sealing member for closing the pipeline PL (temporary pipe TP). It is also possible to omit this as in the pressure inspection device 401 (hereinafter, this is referred to as a “fifth embodiment”) shown in 6.

Hereinafter, the pressure inspection device 401 configured in this way will be described. In the following description, the same components as those in the above "first embodiment" are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 6, the pressure inspection device 401 includes a flange joint 13 as a sealing member. The flange joint 13 is attached to the flange joint TF2 of the temporary pipe TP2 connected to the gas plug GV with a gasket (not shown) interposed therebetween. The reference body 20 and the reference body side pipe 50 are connected to the flange joint 13 as in the "first embodiment".

The reference body 20 is arranged inside the temporary pipe TP2 with the flange joint 13 connected to the flange joint TF2.

Similar to the "first embodiment", the on-off valve 70 is connected to the reference body side pipe 50, while the reference body side pressure gauge 30B is connected via the pressure resistant hose 51.
In the on-off valve 70, the reference body side pipe 50 is connected to one connection port, while the hose connection joint HC3 is joined to the other connection port.

A branch pipe BP is connected to the temporary pipe TP2 in the middle of the pipe line, and hose connection joints HC1 and HC2 are attached to the other end of the branch pipe BP (for example, a diameter of 10 mm).
The hose connection joint HC3 (on-off valve 70) is connected to the hose connection joint HC1 via the pressure resistant hose H, while the hose connection joint HC2 has a pressure resistance as in the "first embodiment". The pressure gauge 30A on the inspected object side is connected via a hose 41, a three-pronged joint 42 with an on-off valve, and a pressure resistant hose 43 (see FIG. 1).

According to the present embodiment configured in this way, the tubular member 10 as in the "first embodiment" can be omitted, so that the pressure inspection device 401 can be made compact.

Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the essays and drawings which form a part of the disclosure of the present invention according to this embodiment. That is, it should be added that all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on this embodiment are of course included in the scope of the present invention.

1,101,201,301,401 Pressure inspection device 10,310 Cylindrical member 310a Through hole 11 to 13 Flange joint 13a Through joint 20, 220, 320 Reference body 30 Pressure measuring device 30A Inspected body side pressure gauge 30B Reference body side pressure Total 40,340 Inspected body side piping 40a, 340a Hose connection joint 41, 43, 44 Pressure resistant hose 42 Three-pronged joint with on-off valve 50 Reference body side piping 50a Hose connection joint 51 Pressure resistant hose 60, 260 Bypass piping 260A Upstream side bypass piping 260B Downstream side bypass pipe 70, 370 On-off valve 370A Body part 370B Handle part 80 Pressurizing device PL Pipe line P Gas pipe GV Gas plug T Branch joint TP, TP2 Temporary pipe TF, TF2 Flange joint BP Branch pipe H Pressure resistant hose HC1 ~ HC3 hose connection joint

Claims (6)

A pressure inspection device that inspects the airtightness of the internal space of the object to be inspected.
A sealing member that closes the opening communicating with the internal space,
A reference body having a closed space into which a pressurized fluid supplied to the internal space can be introduced,
A measuring device capable of measuring the pressure difference between the pressure of the pressurized fluid in the internal space and the pressure of the pressurized fluid in the enclosed space is provided.
The sealing member is
A connection portion connected to the opening and a connection portion
It has a hollow hollow portion continuously provided in the connecting portion and into which the pressurized fluid existing in the internal space is introduced.
The reference body is
Provided on the sealing member
The opening has a contact portion that comes into contact with the pressurized fluid existing in the internal space in a state of being closed by the sealing member.
The contact part is
At least a part of it is arranged in the hollow portion.
It is made of a material having thermal conductivity that transfers the heat of the pressurized fluid existing in the internal space to the pressurized fluid existing in the enclosed space.
A pressure inspection device characterized by that. The first aspect of the invention is characterized in that the pressure inspection device further includes a switchgear that can move between an open position that communicates the space in the hollow portion and the closed position that communicates with the closed space and a closed position that makes the space non-communication. Pressure inspection device. The pressure inspection device further includes a bypass pipeline connecting the space in the hollow portion and the closed space.
The pressure inspection device according to claim 2 , wherein the switchgear is provided in the bypass pipeline. The pressure inspection device is
A switchgear that can move between an open position that communicates the internal space and the closed space and a closed position that does not communicate with each other.
A bypass pipeline connecting the internal space and the closed space is further provided.
The pressure inspection device according to claim 1 , wherein the switchgear is provided in the bypass pipeline. It is a pressure inspection method that inspects the airtightness of the internal space of the object to be inspected using a pressure inspection device.
The pressure inspection device is
A sealing member that closes the opening communicating with the internal space,
A reference body having a closed space into which a pressurized fluid supplied to the internal space can be introduced,
A measuring device capable of measuring the pressure difference between the pressure of the pressurized fluid in the internal space and the pressure of the pressurized fluid in the enclosed space is provided.
An opening closing step of closing the opening with the sealing member,
The step of pressurizing the object to be inspected to supply the pressurized fluid to the internal space,
A reference body pressurizing step of introducing the pressurized fluid into the enclosed space, and
The pressure of the pressurized fluid in the internal space supplied by performing the subject pressurizing step and the pressurized fluid in the sealed space introduced by performing the reference body pressurizing step. Including a differential pressure measuring step of measuring a pressure difference from a pressure using the measuring device.
The sealing member is
A connection portion connected to the opening and a connection portion
It has a hollow hollow portion continuously provided in the connecting portion and into which the pressurized fluid existing in the internal space is introduced.
The reference body is
Provided on the sealing member
The opening has a contact portion that comes into contact with the pressurized fluid existing in the internal space in a state of being closed by the sealing member.
The contact part is
At least a part of it is arranged in the hollow portion.
It is made of a material having thermal conductivity that transfers the heat of the pressurized fluid existing in the internal space to the pressurized fluid existing in the enclosed space.
A pressure inspection method characterized by that. The pressure inspection device further includes a switchgear that can move between an open position that makes the internal space communicate with the closed space and a closed position that makes the closed space non-communication.
The fifth aspect of claim 5 , wherein at least one of the inspected body pressurizing step and the reference body pressurizing step includes a step of moving the switchgear from the closed position to the open position. Pressure inspection method.

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