JP2852595B2 - Flange type differential pressure / pressure transmitter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm base serving as a pressure measuring end of a detecting portion body which is mounted and fixed to a measured portion using a floating flange in order to detect a pressure or the like of various process fluids. The present invention relates to a flange type differential pressure / pressure transmitter configured as described above.

[0002]

2. Description of the Related Art A flange type differential pressure or pressure transmitter (referred to as a differential pressure / pressure transmitter) is used to measure the pressure or the like of various process fluids. In other words, this type of flange type differential pressure / pressure transmitter is equipped with a diaphragm base, which is a flange-shaped pressure measuring end, fixed to a pressure measuring part such as a closed tank or various process piping, and measures the pressure in the tank. It is supposed to.

In a flange type differential pressure / pressure transmitter of this type, which measures the pressure of a corrosive fluid or a high-temperature fluid, a flange-shaped diaphragm extending from a detection body through a neck portion is used. It has been common practice to mount and fix the base on the pressure-measured portion side by means of a floating flange.

That is, since the flange portion of the pressure measuring end exposed to the fluid to be measured such as the corrosive fluid or the high-temperature fluid described above is required to have corrosion resistance and high-temperature strength, for example, tantalum (Ta), Hastelloy, titanium, etc. It is required to be formed of a high-grade metal material having corrosion resistance. However, since such a material is expensive, only the necessary minimum portion of the flange-shaped diaphragm base portion as a pressure measuring end described above that is in contact with the liquid is formed of this high-grade material, and other portions, For example, a portion for assembling and fixing the diaphragm base to a portion to be measured has been conventionally formed as a so-called floating flange using a relatively easily obtainable material such as stainless steel.

FIG. 3 shows a schematic configuration of a conventional flange type differential pressure / pressure transmitter 1. As shown in FIG. Referring to FIG. 1, a flange type differential pressure / pressure transmitter 1 includes a transmitter main body 2 and a terminal box 3 integrally connected to a side of the transmitter main body 2 and a neck 4 on the back side of the transmitter main body 2. A detection unit body 5 provided therein with a barrier diaphragm and a center diaphragm (both not shown) as pressure detection means for performing pressure measurement in comparison with a reference pressure; Of the fluid 9 to be measured facing the opening 8 of the pressure-measuring portion 7 by being fixed to the pressure-measuring portion 7 such as a tank side wall portion by a screw or the like and provided at the tip of the neck portion 6 extending from the portion. Pressure-measuring barrier diaphragm 1 enclosing a pressure transmission medium such as silicone oil so as to sense pressure
1 is provided with a diaphragm base 10 which is a flange-shaped pressure measuring end having an end surface 1.

In the above-mentioned flange type differential pressure / pressure transmitter 1, the structure of the transmitter main body 2, the terminal box 3, the detecting section body 5 and the like are conventionally well known, and a specific description thereof will be given. Is omitted.

Here, the diaphragm base 10 is
When the fluid to be measured is a corrosive fluid or a high-temperature fluid, it is formed of a high-grade material having corrosion resistance and high-temperature strength. And
The diaphragm base 10 is provided integrally with the distal end of the neck portion 6 and has an opening 8 of the pressure measuring portion 7.
The gasket 12 is pressed and fixed so as to close the portion.

Reference numeral 13 denotes a substantially ring-shaped floating flange which is movably disposed on the outer side of the diaphragm base 10 opposite to the barrier diaphragm, and as shown in FIG. The diaphragm base 10 is fixed to the pressure-measuring portion 7 side by a fixing bolt 14 in this state. In this state, the diaphragm base 10 is pressed against the pressure-measuring portion 7 and held and fixed. Here, such a floating flange 13 is formed of a general metal material such as stainless steel, unlike the diaphragm base 10 described above.

Such a flange type differential pressure / pressure transmitter 1 is provided with a diaphragm base which is a flange-shaped pressure measuring end in an opening 8 provided in a pressure measuring portion 7 such as a tank or a pipe in various plant facilities and the like. It is attached and fixed with the side 10 facing, and measures the pressure in the pressure-measured part 7.

According to such a flange type differential pressure / pressure transmitter 1, when the transmitter 1 is transported,
In order to assemble the above-mentioned floating flange 13 which is loosely fitted in the neck portion 6 between the detecting portion body 5 and the diaphragm base 10 in a state of being loosely attached to the transmitter 1, the floating flange 13 is provided. Is screwed from a direction parallel to the neck part 6 in a state in which it is abutted against the side surface of the diaphragm base 10 on the side of the detection part body 5.
Was temporarily stopped. Here, such a temporary fixing screw 15 performs temporary fixing until the differential pressure / pressure transmitter 1 is installed on site, and its mechanical strength may be small. .

[0011]

However, in the case of the flange type differential pressure / pressure transmitter 1 which is attached to the portion 7 to be measured using the floating flange 13 as described above, the transmitter 1 is transported. The handling of the temporary fixing screw 15 for temporarily fixing the floating flange 13 to the diaphragm base 10 at the time of dragging is a problem.

That is, the above-mentioned temporary fixing screw 15
Even after the transmitter 1 is installed at the site, the transmitter 1 is kept in an assembled state. However, at the time of this installation, there is a possibility that the screw 15 is loosened due to vibration or impact and falls off. For this reason, it is necessary to add a loosening prevention means to the temporary fixing screw 15, which causes an increase in the number of parts and inevitably complicates the operation.

Further, when the above-mentioned temporary fixing screw 15 comes off, the floating flange 13 can be used for maintenance or the like.
When the fixing bolt 14 is removed, the diaphragm base 10 pressed and held by the floating flange 13 is displaced together with the main body of the transmitter 1, and the barrier diaphragm 9 corresponding to the opening 8 is moved to the pressure measuring section 7. There is a possibility that a problem such as a problem of damage may occur due to contact with the side surface of the vehicle, and it is desired to take some measures to solve such a problem.

In particular, such a problem arises when the transmitter 1 is mounted and fixed in a horizontal state extending horizontally from the pressure-measuring portion 7 as shown in FIG. It is inevitable that it will fall down due to its own weight,
You must take such points into consideration.

The present invention has been made in view of such circumstances, and it is possible to eliminate the problem of a temporary fixing screw for temporarily fixing a floating flange to a diaphragm base as a pressure measuring end by a simple structure. The purpose is to obtain a flange type differential pressure / pressure transmitter that can be used.

[0016]

SUMMARY OF THE INVENTION In order to meet such a demand, a flange type differential pressure / pressure transmitter according to the present invention is provided integrally with a detecting portion body and has a pressure transmitting medium enclosed therein. A diaphragm base having a pressure barrier diaphragm on its end face and fixed to the pressure-measured portion side, and a floating flange mounted on the anti-barrier diaphragm side of the diaphragm base, are fitted to the diaphragm base and the floating flange. And a through hole extending from the outer periphery to the fitting portion with the bolt hole of the fixing bolt being fitted to the pressure measuring portion of the floating flange being formed, and a diaphragm base is fitted while leaving a part in the through hole. It is configured to attach a fastening member to the joint.

[0017]

According to the present invention, a floating flange for fixing the diaphragm base to the pressure-measuring portion side is fitted to the fitting portion of the diaphragm base on the side opposite to the diaphragm, and the flange extends radially from the outer peripheral portion thereof. The fastening member is assembled into the through-hole formed as above, a part of the fastening member is left in the through-hole, and is assembled to the fitting part of the diaphragm base. By fixing to the part
It is possible to prevent the fastening member from coming off due to loosening at the time of installation on site by the presence of the fixing bolt.

[0018]

1 and 2 (a) and (b) show an embodiment of a flange type differential pressure / pressure transmitter according to the present invention, and a diaphragm which is a main part of a flange-shaped pressure measuring end. Only an assembly part with the base 10, the floating flange 13 and the measured part 7 is shown. The overall schematic configuration of the flange type differential pressure / pressure transmitter 1 including the detection unit body 5 is as illustrated in FIG. 3 and the like described above, and the same or corresponding parts as those in FIG. , And a detailed description thereof will be omitted.

According to the present invention, the flange type differential pressure
A diaphragm base 10 which is a flange-shaped pressure measuring end constituting a pressure measuring end portion of the pressure transmitter 1 and a floating flange assembled on the side opposite to the barrier diaphragm 11;
As is clear from FIGS. 1 and 2A and 2B,
A fitting portion 20 is provided, and through holes 21 (21a, 21a) reaching the fitting portion 20 from the outer periphery with the bolt hole 18 of the fixing bolt 14 to the pressure-measured portion 7 of the floating flange 13 interposed therebetween.
b) to form an inner hole 21 b in the through hole 21.
The fitting part 20 of the diaphragm base 10 is partially left inside.
It is characterized in that a fastening member 22 such as a hexagonal hole or cross hole temporary fixing bolt or the like is assembled to the fixing member 22.

Here, the fitting portion 20 described above is formed by a small-diameter portion in which the inner peripheral portion of the floating flange 13 is fitted on the diaphragm base 10 on the side opposite to the barrier diaphragm 11. That is, the outer diameter of the fitting portion 20 formed by the small diameter portion of the diaphragm base 10 and the inner diameter of the floating flange 13 are made to match, and these are combined in a fitted state.

In the drawing, reference numeral 19 denotes a screw hole formed on the portion 7 to be measured corresponding to the bolt hole 18 of the fixing bolt 14.

According to such a configuration, the fitting portion 20 on the side of the diaphragm base 10 opposite to the barrier diaphragm 11 is provided.
A floating flange 13 for fixing this to the part to be measured 7 is fitted therein, and a fastening member 22 is inserted into a through hole 21 (21a, 21b) formed radially from an outer peripheral portion thereof.
Is assembled to the fitting portion 20 of the diaphragm base 10 while leaving a part thereof in the inner hole 21b of the through hole 21, and the fixing bolt 14 is further assembled to the bolt hole 18 and the screw hole 19. It is preferable to fix the floating flange 13 to the pressure-measuring portion 7.

In this manner, since the fastening member 22 provided in the inner hole 21b in the through hole 21 is closed by the fixing bolt 14 inserted into the bolt hole 18, the fastening at the time of installation at the site is performed. The falling off of the member 22 due to the loosening is prevented by the presence of the fixing bolt 14.

Therefore, as in the prior art, the floating flange 1
In temporarily fixing the diaphragm base 3 to the diaphragm base 3, it is not necessary to use a loosening prevention means, and the fixing can be performed by using a fixing bolt 14 for fixing the floating flange 13 to the measured portion 7. It has the advantage that no special components are required.

Further, according to the above-described configuration, a part of the floating flange 13 is connected to a part of the diaphragm base 10.
Since the configuration is such that they are overlapped in the thickness direction, the thickness at this portion can be reduced, and this portion can be reduced in size, which is effective in reducing the size and weight of the entire transmitter 1. is there.

Here, in the above-described embodiment, the fastening member 2
2, a hexagon socket head bolt or the like is used. In this case, as apparent from FIG. 2B, the fixing bolt 14 is fixed between the inner hole 21b of the through hole 21 and the bolt head. It is necessary to provide some margin S, S in the tightening direction. This is because when the diaphragm base 10 is pressed against the floating flange 13, the gasket 12
This is because it is necessary to secure the seal allowance of the above, and to prevent the flange load from being applied to the fastening member 22.

The present invention is not limited to the structure of the above-described embodiment. For example, the detecting unit body 5, the diaphragm base 10 which is a flange-shaped pressure measuring end provided with the neck portion 6 interposed therebetween, the floating flange 13, etc. And the shape, structure, and the like of the pressure-measured portion 7 and the like can be freely modified and changed. Further, as the fitting portion 20 between the above-described diaphragm base 10 and the floating flange 13 or the fastening member 22 provided between the fitting portion 20 and the through hole 21,
An appropriate structure or the like is conceivable.

Further, the flange type differential pressure / pressure transmitter 1 according to the present invention is not limited to the structure applied in the above-described embodiment, but is used for measuring the differential pressure / pressure in various devices and apparatuses in various fields. The effect can be exhibited when used.

[0029]

As described above, according to the flange type differential pressure / pressure transmitter according to the present invention, the pressure measuring barrier diaphragm which is integrally connected to the detecting portion body and encloses the pressure transmitting medium has the end face. A diaphragm base assembled and fixed to the pressure-measuring portion side, and a floating flange assembled to the side of the diaphragm base opposite to the barrier diaphragm, wherein a fitting portion is provided between the diaphragm base and the floating flange, A through hole extending from the outer periphery to the fitting portion is formed across the bolt hole of the fixing bolt to the measured portion of the flange, and a fastening member is attached to the fitting portion of the diaphragm base while leaving a part in this through hole. Because it is configured to be assembled, despite the simple structure, when the floating flange is temporarily fixed to the anti-barrier diaphragm side of the diaphragm base, special looseness is required. Without using the locking means, there are a variety excellent effect that the falling off of the fastening member for temporary fixing can be easily and reliably prevented.

Further, according to the present invention, in the above-mentioned conventional structure, the floating flange is fitted on the side of the diaphragm base opposite to the barrier diaphragm and assembled in an overlapped state, so that the thickness at this portion is reduced and the compact structure is achieved. It also has advantages such as reduction in weight and weight.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of a flange type differential pressure / pressure transmitter according to the present invention, in which a floating flange, which is a main part, and a mounting portion of a pressure measuring end flange to a pressure measuring portion are disassembled. FIG.

FIG. 2A is an enlarged sectional view of a main part showing a temporary fixing portion of a floating flange to a pressure measuring end flange and a fixing portion of a floating flange to a pressure measuring portion, which characterize the present invention, and FIG. FIG. 3 is an enlarged view of a temporary fixing screw portion in FIG.

FIG. 3 is a schematic configuration diagram showing an assembled state of a conventional flange type differential pressure / pressure transmitter to a pressure-measuring part.

FIG. 4 is an enlarged schematic sectional view showing a main part of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flange type differential pressure / pressure transmitter 5 Detector body 6 Neck part 7 Measured part 8 Opening 9 Fluid to be measured 10 Measuring end flange 11 Barrier diaphragm 12 Gasket 13 Floating flange 14 Fixing bolt 15 Temporary fixing screw Reference Signs List 18 Bolt hole 19 Screw hole 20 Fitting part with small diameter part 21 Through hole 21b Inner hole of through hole 22 Fastening member such as hexagon socket head bolt, cross head bolt

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01L 13/00 G01L 19/00

Claims (1)

(57) [Claims] A detecting unit body having pressure detecting means;
A diaphragm base which is integrally connected to the detection unit body and has a pressure measuring barrier diaphragm for enclosing the pressure transmitting medium on its end face and which is fixedly mounted on the pressure measuring part side, and a barrier diaphragm opposite to the diaphragm base A flange type differential pressure / pressure transmitter having a floating flange mounted on the side, wherein a fitting portion is provided on the diaphragm base and the floating flange, and a fitting portion is formed from the outer periphery with the bolt hole of the floating flange interposed therebetween. A flange-type differential pressure / pressure transmitter characterized in that a through hole is formed, and a fastening member is attached to a fitting portion of the diaphragm base while leaving a part in the through hole.