JP3404311B2 - Pressure gauge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Bourdon tube type pressure gauge, and more particularly to a small direct reading Bourdon tube type pressure gauge used for fire extinguishers and the like.

[0002]

BACKGROUND ART As a fire extinguisher, a pressure type fire extinguisher and a pressure storage type fire extinguisher are mainly known. A pressure gauge is not required for a pressure-type fire extinguisher, and it is obliged to equip a pressure saving fire extinguisher with a pressure gauge by a ministerial decree. And the extinguishing agent and the gas are filled in the interior of each of the fire extinguishers. As a pressure gauge attached to a pressure storage type fire extinguisher, one having a structure as shown in FIGS.

That is, the pressure gauge 11 includes a case body 12
The case body 12 is provided with a bottom portion 12A having a hole in the center, and an edge portion 1 that is raised around the entire circumference of the bottom portion 12A and has a tip portion slightly recessed inward.
2B and is formed in an overall concave shape. And
Such a pressure gauge 11 is used for the fire extinguisher body 3 which is the measured part.
It is designed to be attached to 0.

The case body 12 has a male screw portion 1 on one end side.
3A, a joint 13 having a nut portion 13B on the other end side,
It is fixed by fixing means such as welding, brazing and soldering all around. Then, the male screw portion 1 of the joint 13
The case body 12, that is, the pressure gauge 11 can be attached to the fire extinguisher body 30 by screwing 3A onto the female screw portion 30A provided in the fire extinguisher body 30. Case body 1
Inside the case 2, a scale plate 14 is provided in contact with the bottom surface portion 12A of the case body 12, and a transparent cover 15 made of glass, synthetic resin or the like is further provided.

The scale plate 14 is provided with pressure indication, material, year of manufacture, range indicated by a pointer, and the like.
The transparent cover 15 is formed in a concave shape in cross section, and a protrusion 15A bulging outward is formed on the outer periphery of the edge portion. The outer periphery of the protrusion 15A is in close contact with the inner periphery of the edge 12B of the case body 12, and an O-ring 16 is mounted in the gap between the base end of the protrusion 15A and the edge 12B of the case body 12. Has been done. Here, the case body 12 and the transparent cover 15
The space surrounded by is the storage space S, and this storage space S
The Bourdon tube 17 is housed inside.

The Bourdon tube 17 has a pressure introducing hole 17 inside.
It is formed by having a cylindrical base end portion 17A that is C and a spiral portion 17B that is continuous with the base end portion 17A. The spiral portion 17B is stored in the storage space S, and the cylindrical base end is formed. The portion 17A is inserted through the bottom surface portion 12A of the case body 12 and the center portion of the joint 13, and the end portion thereof is the fire extinguisher body 3
It faces the inside of 0. A pointer 18 is connected to the tip of the spiral portion 17B of the Bourdon tube. The end portion of the spiral portion 17B is sealed by welding or the like, and the sealing portion A is sealed by welding or the like, and the contact portion of the end portion of the cylindrical base end portion 17A and the joint 13 is similarly sealed by welding or the like. It is a sealing portion B, which prevents pressure leakage.

If these sealing portions A and B are in an incomplete state, they naturally leak. Further, when the Bourdon tube 17 breaks due to various conditions such as fatigue, leakage naturally occurs, and as a result, the pressure filled in the fire extinguisher body 30 is filled in the storage space S of the pressure gauge 11, and the case, transparent cover, etc. Risk of destruction and injury to surrounding people. Therefore, in order to maintain safety in the event of a leak, the pressure gauge 1
1 is provided with a through hole 12C for decompression as a technical standard.

When the through hole 12C is always open, external moisture or foreign matter may enter the storage space S. Therefore, the through hole 12C may be, for example, a transparent adhesive tape (color change tape). But it is closed at 19. When such an adhesive tape 19 leaks, the pressure inside the storage space S of the pressure gauge 11 rises, and the internal pressure is released to the atmosphere so that a part of the transparent tape 19 is peeled off. Since the leakage trace C appears as shown in FIG. 6, it is possible to confirm whether or not the leakage has occurred in the pressure gauge 11 by observing the state of the adhesive tape 19.

On the other hand, the pressure gauge 11 is manufactured in an extremely small size because it requires a low price and is also used for a small fire extinguisher. In addition, the pressure gauge 11 also needs a national certification, and the certifying seal 10 as proof is the pressure gauge 11
It is attached to the center of the transparent cover 15. For this reason,
Up to now, the through hole 12C is usually provided on the back surface of the pressure gauge 11.

[0010]

However, since the pressure gauge 11 for the fire extinguisher is fixed to the fire extinguisher body 30, and a cover for protecting the pressure gauge 11 is attached,
As a general rule, it is only visible from the front.
For this reason, if the through hole 12C is provided on the back surface of the pressure gauge 11, it cannot be confirmed from the front side when detecting the leak, and therefore, for example, a mirror used by a dentist must be used. However, there is a problem that it is difficult to detect the leakage.

An object of the present invention is to provide a pressure gauge capable of easily checking pressure leakage even with a small pressure gauge.

[0012]

A pressure gauge according to a first aspect of the present invention is a case main body connected to a measured portion side through a joint, and a case main body attached to the case main body . A transparent cover that forms a storage space between
In a pressure gauge provided with a pressure-sensitive element that is housed in the housing space and into which pressure from the measured portion side is introduced,
A pressure reducing through hole is formed in the transparent cover, and a transparent pressure leak detection seal is formed by closing the through hole.
Affixed and for detecting the pressure leak of the transparent cover
The present invention is characterized in that the inner surface of the sticking position is roughened .

In the above description, the part to be measured is preferably inside the fire extinguisher body, but this pressure gauge can be applied to other pressure-use objects. Further, it is preferable to use, for example, a Bourdon tube type, a capacitance type, a strain gauge type or the like as the pressure-sensitive element. In the case of the Bourdon tube type, it can be applied to either a direct reading type or an enlarging mechanism. Furthermore, the Bourdon tube is preferably made of a material such as stainless steel, brass, phosphor bronze or the like. Further, it is preferable to use glass, synthetic resin or the like as the transparent cover. Further, although it is preferable to use a transparent synthetic resin tape as the pressure leak detection seal, a seal whose color changes due to deformation due to leakage may be used.
Furthermore, rough surface processing is the processing of a smooth surface into a rough surface.
And means to include coloring such as black.
As an example of processing a smooth surface into a rough surface, for example, grain processing is
However, knurling may be used.

In the present invention as described above, since the through hole for depressurization is formed in the transparent cover and the through hole is closed by the pressure leak detecting seal, the pressure inside the pressure gauge is kept for some reason. If there is a leak, it can be seen from the front of the pressure gauge. Therefore, even a small pressure gauge can easily perform pressure leak check. Also,
If the roughened surface is colored such as black, it will not leak.
The more discolored, the easier it is to check for leaks. Well
Also, the size of the roughened part almost matches the outer diameter of the Bourdon tube.
By doing so, when viewed from the front, the Bourdon tube is roughened
Because it is hidden, it has a good appearance.

A pressure gauge according to a second aspect of the present invention is
The pressure gauge according to claim 1, wherein the pressure-sensitive element is formed of a Bourdon tube, and the through hole is formed at a position substantially corresponding to a central portion of the Bourdon tube.

In the present invention as described above, since the pressure indicating pointer is provided on the outer periphery of the Bourdon tube, the through hole is formed at a position substantially corresponding to the center of the Bourdon tube. Has no effect on the guidelines,
You can see the movement of the display pointer normally.

[0017]

[0018]

[0019]

The pressure gauge according to claim 3 of the present invention is
The pressure gauge according to claim 1 or 2 , wherein the pressure leak detection seal is formed in a larger area than an appraisal seal based on the Fire Service Act, and the appraisal seal is attached on the leak detection seal. It is characterized by being present.

In the present invention as described above, the display of the scale plate of the pressure gauge is not hidden by the appraisal seal. Further, if there is a pressure leak, the leak trace remaining on the inner surface of the pressure leak detection seal having a larger area than the appraisal seal can be seen, so that the leak can be easily detected.

A pressure gauge according to claim 4 of the present invention is
The pressure gauge according to any one of claims 1 to 3 is characterized in that the pressure gauge is attached to a recess formed in an object to be attached.

In the above description, the object to be attached is preferably the fire extinguisher body, but it may be other pressure-use objects. The shape of the recess may be round or quadrangular, and the depth dimension thereof is preferably larger than the thickness dimension of the pressure gauge.

In the present invention as described above, since the pressure gauge is attached to the recess and does not project to the outside,
The pressure gauge will not be damaged even if the fire extinguisher or other attached object falls.

The pressure gauge according to claim 5 of the present invention is
The pressure gauge according to claim 4 , wherein the case body is
It is characterized in that it has a flange portion, is screwed and fixed to the attached object via the flange portion, and the joint is fitted and connected to the attached object via a seal member. .

In the present invention as described above, since the pressure gauge is not mounted by screwing, it is possible to easily orient the scale position in the direction that is most easy to see. In addition, in the present invention
The pressure gauge according to claim 6 relates to claims 2 to 4.
In the pressure gauge according to any one of 3 above,
The area of the part is large enough to hide the Bourdon tube.
It is characterized by that.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the pressure gauge 1 according to the first embodiment of the present invention has a through hole for pressure reduction, which has been conventionally formed on the back surface of the pressure gauge, formed on the surface of the transparent cover 5. is there. The transparent cover 5 has almost the same shape as the transparent cover 15. Further, in the present embodiment, only parts different from the pressure gauge of the conventional example will be described in detail, and other same members and same structures will be denoted by the same reference numerals, and detailed description thereof will be omitted or simplified.

Along with the case body 2 having exactly the same shape as the case body 12, one through hole 5A for decompression having a predetermined size is opened in the center of the surface of the transparent cover 5 which constitutes the storage space S. There is. The through hole 5A is closed with an adhesive tape 9 similar to the adhesive tape 19 which is a transparent pressure leak detection seal, and the appraisal seal 10 is attached to the surface of the adhesive tape 9. Here, the adhesive tape 9 is formed in a larger area than the appraisal seal 10.

The center of the back surface of the transparent cover 5 is roughened such as grained and knurled. The area of the roughened portion 5B is almost the same as the outer diameter of the spiral portion 17B of the Bourdon tube 17, and the Bourdon tube 17 can be hidden by the roughened portion 5B when viewed from the front. ing. The roughened portion 5B and the adhesive tape 9 have substantially the same area. Further, the roughened portion 5B may be colored in black or the like instead of being textured.

Next, a method of using such a pressure gauge 1 will be described. The pressure gauge 1 is attached to the fire extinguisher body 30 by screwing the male screw portion 13A of the joint 13 into the female screw portion 30A of the fire extinguisher body 30 and turning the nut portion 13B with a wrench or the like. Then, the fire extinguisher body 30 is filled with pressure (gas + extinguishing agent). The pressure is filled into the spiral portion 17B from the pressure introducing hole 17C of the cylindrical base end portion 17A,
The spiral portion 17B is expanded and the pointer 18 is moved to a predetermined position.

When the pressure inside the fire extinguisher body 30 leaks into the pressure gauge 1 and becomes full, the gas filling the pressure gauge 1 is filled with the gas of the transparent cover 5 in the same manner as described with reference to FIG. By peeling the adhesive tape 9 from the through hole 5A, a gap is formed between the transparent cover 5 and the adhesive tape 9, and it is constantly discharged to the atmosphere from there. At this time, since the trace of pressure release is attached to the inside of the tape 9, pressure leak can be detected, and
The pressure does not accumulate in the storage space S and damage the case body 2 and the like.

According to this embodiment, the following effects can be obtained. The through hole 5A for depressurization is opened on the surface of the transparent cover 5, and the leakage can be known from the trace of leakage on the transparent adhesive tape 9. Therefore, since the pressure gauge can be seen from the front, the leak can be easily detected.

The depressurizing through hole 5A is formed on the surface of the transparent cover 5 and at a position substantially corresponding to the center of the Bourdon tube 17, while the display pointer 18 is provided on the outer periphery of the Bourdon tube 17. Since there is a through hole 5A, the pointer for display 1
8 is not affected at all, and the movement of the display pointer 18 can be seen normally.

Since the size of the roughened portion 5B formed on the back surface of the center of the transparent cover 5 is almost the same as the outer diameter of the Bourdon tube 17, the Bourdon tube 17 is seen from the front.
Are hidden by the roughened portion 5B, resulting in a good appearance.

Adhesive tape 9 which is more transparent than the appraisal sticker 10
Has a large area, the display of the scale plate 14 and the like of the pressure gauge 1 is not hidden by the appraisal sticker 10. Further, when there is a pressure leak, the leak trace remaining on the inner surface of the adhesive tape 9 having a larger area than the appraisal seal 10 can be seen, so that the leak can be detected. The through hole 5A for depressurization may be formed in the central portion of the surface of the transparent cover 5, which is a hole drilling process on a flat surface portion.
Easy to process.

Next, the second embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. In the present embodiment, the pressure gauge 21 having the same structure as the pressure gauge 1 is provided in the recess 30 on the side surface of the fire extinguisher 30.
It is provided in B. That is, in the case of the conventional general livestock pressure-type fire extinguisher, as shown in FIG. 9, since the pressure gauge 31 is attached so as to project from the fire extinguisher 30, the pressure gauge 31 is covered with the cover 33, and the It was necessary to prevent the pressure gauge 31 from being damaged due to a fall or the like.

Further, when the method of attaching the pressure gauge by screwing is adopted, it is difficult to fix the orientation of the pressure gauge in a desired direction (direction in which the pointer can be easily read). Leakage of pressure (extinguishing agent + gas) in a fire extinguisher is absolutely unacceptable.
Screwing in loose positions should be eliminated. Therefore, in the case of a screw-in type installation, in order to align the position of the pressure gauge in the rotational direction, it is necessary to perform the alignment in the direction of forcibly tightening, which may damage the screw of the pressure gauge and stabilize the quality. There was a problem of lacking. The second embodiment is intended to solve such a problem.

As shown in FIGS. 7 and 8, a rectangular recess 30B is formed on the upper side surface of the fire extinguisher body 30, and the pressure gauge 21 is mounted in the recess 30B. . The depth dimension of the concave portion 30B is larger than the thickness dimension of the pressure gauge 21. The pressure gauge 21 includes a cylindrical portion 22A and a square flange portion 2
2B and an insertion portion 22C, a case main body 22 and a transparent cover 25 formed of glass or the like attached to the case main body 22 and configured to include a cylindrical portion 22A of the case main body 22 and a transparent cover 25. The space surrounded by is the accommodation space S. The Bourdon tube 17 spiral portion 17B is accommodated in the accommodation space S, and the insertion portion 2
A cylindrical base end portion 17A is provided by being inserted into 2C.

The pressure gauge 21 as described above is used in the fire extinguisher body 30.
The recess 30B is directly fixed with a stud bolt or is attached via a mounting plate 24 that is fixed in advance by welding or the like. That is, the mounting plate 24 is formed to have a size substantially the same as that of the flange portion 22B, and a through hole 24A is formed in the center portion thereof so that the insertion portion 22C can be inserted therethrough.

The mounting plate 24 has a flange portion 22.
Implant bolts 28 are provided in advance so that they can be inserted into the mounting holes formed at the four corners of B, respectively. Therefore, the pressure gauge 21 is fixed by inserting the mounting hole of the flange portion 22B into the stud bolt 28 and screwing the nut 26 into the mounting hole. A seal member 27 such as an O-ring or a gasket is attached to the insertion hole 30C of the fire extinguisher body 30 into which the insertion portion 22C of the pressure gauge 21 is inserted.
It is designed to prevent gas from leaking. In this embodiment, the same members and structures as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted or simplified.

In this embodiment as well, the same actions and effects as in the first embodiment can be obtained, and the pressure gauge 21 is provided in the recess 30B of the fire extinguisher body 30. Since the depth dimension of the recess 30B is larger than the thickness dimension of the pressure gauge 21, the pressure gauge 2
1 does not protrude from the fire extinguisher body 30. Therefore,
Even if the fire extinguisher body 30 may fall down, the possibility that the pressure gauge 21 is damaged is extremely reduced, and the life of the pressure gauge 21 can be extended.

Since the pressure gauge 21 is of a plug-in type, it can be inserted after confirming the rotational direction of the pressure gauge 21, and the pressure gauge 21 can be easily fixed in a desired direction. . In addition, the insertion portion 22C is inserted into the fire extinguisher body 30, and the stud 25 and the nut 2
Since it can be attached by screwing 6, the screw of the pressure gauge can be damaged by forcibly tightening like the case of the screw-in type, so that the stability of the quality is not lost and the pressure of stable quality is not lost. It can be 21 in total.

The present invention is not limited to the above-described embodiments, but may be modified as follows as long as the object of the present invention can be achieved. That is, in each of the above-described embodiments, the pressure gauges 1 and 21 are of a direct reading type in which the pointer 18 is attached to the Bourdon tube 17 having the spiral portion 17B and the cylindrical base end portion 17A.
The invention is not limited to this, and can be applied to a pressure gauge of a type having a known expansion mechanism.

In the first embodiment, the pressure reducing through hole 5A is formed in the center of the surface of the transparent cover 5, but the invention is not limited to this. For example, the through hole 5A is deviated from the edge of the case body 2 on the outer periphery of the transparent cover 5. It may be formed on the upper part of the portion. With this configuration, the fire extinguisher body 30 can be viewed from above with the fire extinguisher body 30 installed, and the leak can be easily detected.

[0045]

As described above, according to the pressure gauge of the present invention, the pressure reducing through hole is formed in the transparent cover, and the pressure leak detecting seal closes the through hole. Even if pressure leaks inside the pressure gauge for some reason, the leak can be seen from the front of the pressure gauge. Therefore, even a small pressure gauge can easily perform pressure leak check.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a pressure gauge according to a first embodiment of the present invention.

FIG. 2 is a front view of the pressure gauge according to the first embodiment with a transparent cover removed.

FIG. 3 is an exploded perspective view showing a pressure gauge according to the first embodiment.

FIG. 4 is a vertical sectional view showing a conventional pressure gauge.

FIG. 5 is a perspective view of a conventional pressure gauge as viewed from the back.

FIG. 6 is a diagram showing a state where pressure leaks in a conventional pressure gauge.

FIG. 7 is an overall perspective view showing a state in which a pressure gauge according to a second embodiment of the present invention is attached to a fire extinguisher body.

FIG. 8 is a vertical cross-sectional view showing a mounted state of the pressure gauge according to the second embodiment.

FIG. 9 is an overall perspective view showing a mounted state of a conventional pressure gauge .

[Explanation of symbols]

1,21 pressure gauge 2,22 Case body 5 transparent cover 5A Through hole for decompression 5B Roughened part 9 Transparent adhesive tape that is a pressure leak detection seal 10 Appraisal sticker 13 joints 14 Scale plate 17 Bourdon Tube 27 Seal member 30 fire extinguisher body 30B recess

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-308699 (JP, A) JP-A-54-153683 (JP, A) Actually open 62-66298 (JP, U) Actual-open Sho 58- 165646 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01L 7/04 A62C 13/76 G01M 3/32 G12B 1/04

Claims (6)

(57) [Claims] 1. A case main body connected to a measured part side through a joint, a transparent cover attached to the case main body to form a storage space between the case main body, and a storage space in the storage space. In a pressure gauge including a pressure-sensitive element into which pressure from the measured portion side is introduced, a through hole for decompression is formed in the transparent cover,
A transparent pressure leak detection seal is attached by closing this through hole.
And the seal for detecting the pressure leak of the transparent cover.
The pressure gauge is characterized in that the inner surface of the sticking position is roughened . 2. The pressure gauge according to claim 1, wherein the pressure-sensitive element is constituted by a Bourdon tube, and the through hole is formed at a position corresponding to a substantially central portion of the Bourdon tube. Pressure gauge. 3. The pressure gauge according to claim 1 , wherein the pressure leak detection seal is formed in a larger area than an appraisal seal based on the Fire Service Act, and the appraisal seal is used for the pressure leak detection. A pressure gauge that is attached on a sticker. 4. The pressure gauge according to claim 1, wherein the pressure gauge is mounted in a recess formed in an object to be mounted. 5. The pressure gauge according to claim 4 , wherein the case body has a flange portion, and is screwed and fixed to the object to be attached via the flange portion,
Moreover, the pressure gauge is characterized in that the joint is fitted and connected to the attached object via a seal member. 6. The pressure gauge according to any one of claims 2 to 3 , wherein the area of the roughened portion is equal to the area of the roughened surface.
A pressure gauge that is large enough to hide the Bourdon tube .