JPH0979452A - Flange adapter - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: When a remote seal diaphragm type differential pressure transmitter is used, the pressure receiving part is large,
It was difficult to connect to the inch flange, and there were problems such as a large load during installation work. In addition, there are problems that the drain and air of the connection part cannot be removed and that a failure occurs due to contact between the pressure-receiving diaphragm and the fluid to be measured. An area where a first flange portion connected to a 1/2 inch flange on a pipe side and a pressure receiving portion having a pressure receiving diaphragm of a remote seal diaphragm type differential pressure transmitter face the pressure receiving diaphragm. A second flange portion having a concave portion formed in a region including and connected to the pressure receiving portion; and a communication portion connecting the second flange portion and the first flange portion. Further, the second flange portion 2 was provided with a drain vent and an air vent, and a seal liquid reservoir.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure receiving portion at the end of a capillary tube of a remote seal diaphragm type differential pressure transmitter used for measuring the flow rate of a fluid, and a pipe at the end of a nozzle for extracting pressure from a pipe whose flow rate is measured. The present invention relates to a flange adapter that is inserted between a side flange and connects them.

[0002]

2. Description of the Related Art As a method for measuring the flow rate of a fluid, pressures are extracted from the upstream side and the downstream side of an orifice provided in a pipe through which the fluid flows, and the pressure difference between the upstream fluid pressure and the downstream fluid pressure is measured. There is a differential pressure flow rate measurement that converts the flow rate from. A differential pressure transmitter is a device used when measuring a differential pressure flow rate and converting a flow rate from a differential pressure and transmitting the converted flow rate.

FIG. 8 is an explanatory view showing the connection between a conventional differential pressure transmitter of a pressure guiding tube connection type and a pipe for measuring a flow rate. In the drawing, 20 is a pipe, 21 is a 1/2 inch nozzle, 22.
Is a 1/2 inch flange on the piping side, and 21a is a stop valve provided in the 1/2 inch nozzle 21.

Reference numeral 30 is a pressure-guide-tube connected type differential pressure transmitter, 31 is a pressure-guide pipe, and 32 is a 1 / 2-inch flange on the transmitter side. Further, 31a is a three-way valve used when performing zero adjustment of the differential pressure transmitter 30, 31b is a drain valve, and 33 is the differential pressure transmitter 30.
It is a fixed base for fixing.

From the upstream side and the downstream side of the orifice provided in the pipe 20, a nozzle 21 having an outer diameter of 1/2 inch is usually provided, and a 1/2 inch flange 22 is provided at the end thereof. . 1/2 inch flange 32 is provided at the end from the differential pressure transmitter 30 side.
The differential pressure transmitter and the pipe are connected by extending two inch pressure guiding pipes 31 and connecting the flanges on the upstream side and the downstream side respectively on the piping side and the differential pressure transmitter side.

Further, when the fluid whose flow rate is measured is particularly high temperature, high viscosity, coagulability, corrosiveness, etc., the pressure of the fluid is once received by the pressure receiving diaphragm and is passed through the flexible capillary tube filled with the sealing liquid. Therefore, a remote seal diaphragm type differential pressure transmitter for transmitting the measured pressure to the differential pressure transmitter is used.

FIG. 9 is a perspective view showing the external appearance of a remote seal diaphragm type differential pressure transmitter. Reference numeral 40 is a remote seal diaphragm type differential pressure transmitter main body, 41 is a capillary tube, 42 is a pressure receiving portion, and 42a is a pressure receiving diaphragm. is there. Remote seal diaphragm type differential pressure transmitter main body 40
From this, two capillary tubes 41 for upstream and downstream extend, and a pressure receiving diaphragm 42a for detecting the pressure of fluid is provided at the pressure receiving portion 42 at the end of each capillary tube 41.

In the case of the remote seal diaphragm type differential pressure transmitter, since the pressure can be conducted up to the differential pressure transmitter main body 40 through the flexible capillary tube 41 filled with the seal liquid, a pressure guide tube or the like is used. Therefore, it is easy to install the differential pressure transmitter main body 40 at a place apart from the pipe 20, and it is possible to prevent the differential pressure transmitter main body 40 from being affected by the high temperature of the fluid or the like. Further, unlike the case of connecting the pressure guiding tube, there is no problem that the pressure guiding tube is clogged with fluid of high viscosity or the like.

Conventionally, the pressure receiving diaphragm 42a of the remote seal diaphragm type differential pressure transmitter has a diameter of about 3 inches, and the pressure receiving portion 42 has an outer diameter of about 20 cm and is very large and heavy. . Recently, a remote seal diaphragm type differential pressure transmitter having a diaphragm diameter of 1.5 inches and an outer diameter of a pressure receiving portion of about 10 cm has begun to be manufactured.

FIG. 10 is an explanatory view showing the connection between the remote seal diaphragm type differential pressure transmitter and the pipe for measuring the flow rate. The pressure receiving portion 42 at the end of the capillary tube 41 extending from the remote seal diaphragm type differential pressure transmitter main body 40 attached to the fixed base 43 is provided at the end of the nozzle 23 for introducing fluid from upstream and downstream of the orifice provided in the pipe 20. It is connected to the pipe side flange 24. In this case, since the pressure receiving portion 42 is large, the pipe side flange 24 and the nozzle 23 that can be connected to the pressure receiving portion 42 are also large, and the support base 25 and the like are used to support the weight of the connection portion.

[0011]

Since the conventional differential pressure transmitter is constructed as described above, in the case of the pressure guiding pipe connection type, a 1/2 inch diameter pressure guiding pipe is connected from the pipe to the differential pressure transmitter. There was a problem that it was necessary to lay it around and the construction cost was high.

Further, if clogging or corrosion occurs in the pressure guiding tube, the differential pressure cannot be measured correctly, so that there is a problem that it is difficult to apply to a fluid having high viscosity, coagulation and corrosiveness. In the case of a solidifying fluid, it is necessary to use steam for tracing to keep it warm, which poses a problem of high cost. In addition, when the fluid has a high temperature, there is a problem that the differential pressure transmitter main body may be affected by the high temperature and cause a failure.

On the other hand, in the case of using the remote seal diaphragm type differential pressure transmitter, the pressure receiving portion becomes large due to the large diameter of the pressure receiving diaphragm at the end of the capillary tube as described above, and the pipe side flange connectable therewith. Is at least 1 inch flange, and it is impossible to connect to a 1/2 inch flange on the normal piping side.

Therefore, if the flange on the piping side is not a 1/2 inch flange but a size matching the pressure receiving portion, both the flange and the nozzle will have a large diameter and the weight of the connecting portion will exceed. There were problems such as the need for a support base to support the connection part and the increased load during installation work.

Further, in the connection portion between the pressure receiving portion of the conventional remote seal diaphragm type differential pressure transmitter and the pipe side flange, if the connection is loosened and draining is performed, the flange surface may become dirty depending on the internal fluid, There is a problem that the area around the work place may become dirty, and the workability of drain extraction is poor, and there is a problem that it is not possible to easily perform drain extraction or air bleeding of the connection part without special processing. there were.

When the fluid whose flow rate is measured is extremely high, the liquid contact temperature of the pressure receiving diaphragm becomes higher than the allowable temperature of the remote seal diaphragm type differential pressure transmitter, and a failure due to vaporization of the seal liquid occurs. There is a problem that the pressure receiving diaphragm is corroded when the fluid is a corrosive fluid.

The present invention has been made in order to solve the above-mentioned problems, and does not incur the cost of arranging a pressure guiding tube, and can be applied to a high-temperature, high-viscosity, solidifying, corrosive fluid. Seal diaphragm type differential pressure transmitter,
An object of the present invention is to enable easy connection to a 1/2 inch flange on the piping side without using conventional large-scale instrumentation. Another object is to reduce the installation cost of the remote seal diaphragm type differential pressure transmitter by simply connecting.

Another object of the present invention is to facilitate drainage and air bleeding of the connecting portion when the pipe side flange and the pressure receiving portion are connected.

Another object of the present invention is to avoid the failure of the remote seal diaphragm type differential pressure transmitter due to the high temperature fluid, the corrosion of the pressure receiving diaphragm due to the corrosive fluid and the like.

[0020]

According to a first aspect of the present invention, there is provided a flange adapter having a 1 / 2-inch flange at a pipe end of a 1 / 2-inch nozzle for introducing the fluid from a pipe whose flow rate is measured. A first flange portion to be connected,
The remote seal diaphragm type differential pressure transmitter has a concave portion formed in a region including a region facing the pressure receiving diaphragm on a contact surface of a capillary tube end with the pressure receiving diaphragm having the pressure receiving diaphragm, and the pressure receiving unit. A second flange portion that is connected to the second flange portion, and a communication portion that connects the second flange portion and the first flange portion to communicate between the 1/2 inch nozzle and the pressure receiving diaphragm. Is.

A flange adapter according to a second aspect of the present invention is the flange adapter according to the first aspect, further comprising:
The flange is provided with a drain drain.

A flange adapter according to a third aspect of the present invention is the flange adapter according to the second aspect, wherein an air vent is provided at a position substantially opposite to the drain vent.

A flange adapter according to a fourth aspect of the present invention is the flange adapter according to the first aspect, wherein when the first flange portion is connected to the pipe side 1/2 inch flange, the second flange portion The direction of the communication portion is changed so that the contact surface with the pressure receiving portion is substantially parallel to the horizontal plane, and the first flange portion is connected to the communication side portion with the pipe side 1/2 inch flange. A seal liquid reservoir is provided for containing a predetermined amount of seal liquid into which the entire pressure receiving diaphragm is immersed when the second flange portion is connected to the pressure receiving portion.

A flange adapter according to a fifth aspect of the present invention is the flange adapter according to the fourth aspect, wherein at least a part of the communication portion is formed by a flexible tube.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.

Embodiment 1 1 is a partial sectional side view showing the structure of a flange adapter 100 according to Embodiment 1 of the present invention, in which 1 is a first flange portion and 2 is a
Is a second flange portion, 3 is a communicating portion, 4 is a concave portion, 5 is a drain vent plug (drain vent), and 6 is an air vent plug (air vent). Further, 7 is an O-ring groove.

FIG. 2 is an explanatory view showing a state in which the pipe side 1/2 inch flange and the pressure receiving portion of the remote seal diaphragm type differential pressure transmitter are connected using the flange adapter 100 of the first embodiment. In the figure, 20 is a pipe for measuring the flow rate of the fluid, 21 is a 1/2 inch nozzle for introducing the fluid from upstream and downstream of an orifice provided in the pipe 20, 21a is a stop valve, and 22 is a 1/2 inch nozzle. 21 is a pipe side 1/2 inch flange provided at the end of 21, 21 is a remote seal diaphragm type differential pressure transmitter main body, 41 is a capillary tube, 42 is a pressure receiving portion at the end of the capillary tube 41, and the pressure receiving diaphragm 42a is I have it. Reference numeral 43 is a fixed base that supports the remote seal diaphragm type differential pressure transmitter main body 40.

The first flange portion 1 is connected to the pipe side 1/2 inch flange 22. In the present embodiment, a commercially available 1/2 inch flange is used.

The second flange portion 2 is formed to have substantially the same diameter as the outer diameter of the pressure receiving portion 42 at the end of the capillary tube 41 of the remote seal diaphragm type differential pressure transmitter.
2 is connected. On the contact surface of the second flange portion 2 with the pressure receiving portion 42, the pressure receiving diaphragm 4 of the pressure receiving portion 42 is provided.
The concave portion 4 having substantially the same shape as the pressure receiving diaphragm 42a is provided in a region facing the pressure receiving diaphragm 4a.
2a Contact with the entire surface and accurate pressure is received by the diaphragm 42
It is transmitted to a.

The communication portion 3 connects the second flange portion and the first flange portion to communicate between the 1/2 inch nozzle 21 and the pressure receiving diaphragm 42a, and in the present embodiment. Consists of a commercially available 1/2 inch pipe.

FIG. 3 is a front view of the flange adapter 100 according to the first embodiment as viewed from the second flange portion 2 side.
3a is a communication hole communicating with the first flange portion 1 side, 5a is a drain vent hole (drain vent) communicating with the drain vent plug 5, 6a is an air vent hole (air vent) communicating with the air vent plug 6, and Reference numeral 8 is a bolt hole used for bolt connection with the pressure receiving portion. In the present embodiment, the drain vent and the air vent are configured by similar plugs and holes, and the upper side at the time of mounting is used as the air vent and the lower side is used as the drain vent. .

Next, the operation will be described.

FIG. 4 is an explanatory diagram showing the connection of the flange adapter 100 according to the first embodiment with the piping side 1 / 2-inch flange 22 and the pressure receiving portion 42.
50 and 52 are bolts, and 51 and 53 are nuts.

When connecting the first flange portion 1 and the pipe side 1/2 inch flange 22, since the first flange portion 1 is constituted by the 1/2 flange, it is possible to use the normal 1 /
Bolt 50 and nut 51 as well as the connection between the two flanges
Connect by bolting with.

When connecting the second flange portion 2 and the pressure receiving portion 42, an O ring is fitted in the O ring groove 7 of the second flange portion 2, and the second flange portion 2 is inserted through this O ring.
And the pressure-receiving portion 42 are aligned, and bolts 52 and nuts 53 are used to tighten the bolts. Before the connection, the bolt holes are formed at the positions of the peripheral edge portion of the pressure receiving portion 42 that faces the positions of the bolt holes 8 of the second flange portion 2. With the above, the connection is completed in the arrangement as shown in FIG.

At this point, the stop valve 21a is closed and the fluid is stopped to prevent the fluid from flowing out.
Next, an operation of introducing the stopped fluid to the pressure receiving diaphragm 42a is performed.

When introducing the fluid to the pressure receiving diaphragm 42a, first, the stop valve 21a is opened, then the air bleeding plug 6 is loosened to expel the air therein, and when the fluid comes out, the air bleeding plug 6 is tightened. This completes the introduction of the fluid. When the fluid is gas, it is only necessary to open the stop valve 21a.

A remote seal diaphragm type differential pressure is obtained by the above connection and fluid introduction work for the pipe side 1/2 inch flange 22 from the orifice upstream side of the pipe 20 and the pipe side 1/2 inch flange 22 from the orifice downstream side. After the installation of the transmitter is completed, the pressure of the fluid on the upstream side of the orifice of the pipe 20 and the pressure of the fluid on the downstream side of the orifice are controlled by the remote seal diaphragm type differential pressure transmitter main body 40 via the pressure receiving diaphragm 42a and the capillary tube 41. Will be transmitted to.

In the remote seal diaphragm type differential pressure transmitter main body 40, the flow rate of the fluid flowing through the pipe 20 is converted based on the differential pressure between the fluid pressure on the upstream side of the orifice and the fluid pressure on the downstream side of the orifice, and transmission is performed. Done.

The zero adjustment of the remote seal diaphragm type differential pressure transmitter main body 40 can be performed in a state where both the pressure receiving diaphragms 42a are opened to the atmospheric pressure before the pressure receiving portion 42 is connected. In the embodiment, since the drain vent plug 5 and the air vent plug 6 are provided, the stop valves on the upstream side and the downstream side are provided even from the measurement state in which the connection and the fluid introduction are performed as described above. 21a is closed and the drain vent plug 5 and the air vent plug 6 are opened to drain the air and introduce air, thereby opening both the pressure-receiving diaphragms 42a to the atmospheric pressure, and the remote seal diaphragm type differential pressure transmitter main body 40.
It is possible to perform zero adjustment at any time.

When removing the remote seal diaphragm type differential pressure transmitter, first, the stop valve 21a is closed, the drain is drained, and then the bolts 50 and 52 are loosened to remove. When draining the drain, the drain vent plug 5 and the air vent plug 6 are loosened to allow the fluid to flow out from the drain vent plug 5. If the fluid is gas,
Generally this is not necessary.

As described above, in the flange adapter 100 of the present embodiment, when connecting the pipe and the remote seal diaphragm type differential pressure transmitter, the pipe side is not a large size but a general 1/2 inch. The nozzle and the 1/2 inch flange may be used as they are. The first flange portion 1 of the flange adapter 100 is connected to the pipe side 1/2 inch flange 22, and the second flange portion 2 is a remote seal diaphragm type differential pressure transmission. By simply connecting to the pressure receiving portion 42 at the end of the capillary tube 41 of the device, the piping and the remote seal diaphragm type differential pressure transmitter can be connected easily and easily. Therefore, it is possible to reduce the installation cost by eliminating the need for special work such as a support base for the connecting portion when installing the remote seal diaphragm type differential pressure transmitter.

Further, since the concave portion 4 having substantially the same shape as the pressure receiving diaphragm 42a is provided in the area of the second flange portion 2 which is in contact with the pressure receiving portion 42 in the area facing the pressure receiving diaphragm 42a, the fluid receives the pressure receiving diaphragm. The flow rate can be accurately measured by contacting the entire surface of 42a and transmitting accurate pressure to the pressure receiving diaphragm 42a.

Further, since the drain bleeding plug 5 and the air bleeding plug 6 are provided in the second flange portion 2, the air bleeding at the time of attachment, the drain bleeding at the time of removal, etc.
It is possible to easily perform drainage and air bleeding work with good workability, and to perform zero adjustment of the remote seal diaphragm type differential pressure transmitter main body 40 from the connected state at any time.

Further, in the present embodiment, the first flange portion 1 and the connecting portion 3 are composed of commercially available 1/2 inch flange and 1/2 inch pipe, and can be manufactured at low cost. .

It should be noted that the concave portion 4 is provided with the pressure receiving diaphragm 42a.
However, the recess 4 may have a larger area as long as it covers the area facing the pressure receiving diaphragm 42a.

Further, the commercially available 1/2 inch flange and 1/2 inch pipe were used for the first flange portion 1 and the connecting portion 3, but needless to say, it is not necessary to use them.

Embodiment 2 5 is a partial cross-sectional side view showing the structure of a flange adapter 101 according to Embodiment 2 of the present invention. In the figure, 60 is the front stage of the communication part 3, 61 is the rear stage of the communication part 3, and 62 is the aforementioned. A relay portion between the front stage portion 60 and the rear stage portion 61, 61a is a seal liquid reservoir in the rear stage portion 61, and 63 is a seal liquid injection plug. Also,
Reference numeral 1 is a first flange portion and 2 is a second flange portion, which are the same as those shown in the first embodiment.

In this embodiment, the communication portion 3 is formed by connecting the linear front-stage portion 60 and the rear-stage portion 61 by the relay portion 62 while changing the angle by θ, and the first flange portion 1 is formed. When connecting the 1/2 inch flange 22 on the piping side,
The surface of the flange portion 2 in contact with the pressure receiving portion 42 is made substantially parallel to the horizontal plane, the inside of the rear stage portion 61 facing in the vertical direction serves as the seal liquid reservoir portion 61 a, and the seal liquid injection plug 63 is provided above the relay portion 62. It is provided.

The reason for injecting the seal liquid into the seal liquid reservoir 61a is that when the fluid to be measured is a high temperature fluid, a failure may occur due to vaporization of the seal liquid in the pressure receiving diaphragm 42a or a corrosive property. This is to prevent the pressure receiving diaphragm from corroding in the case of a fluid, and the capacity of the seal liquid reservoir 61a is designed to be an amount according to the fluid to be measured. As the seal liquid, a liquid with high viscosity and high specific gravity that does not mix with the fluid is used. When the fluid is gas, it is not necessary to use such liquid.

Next, the operation will be described.

In this embodiment, the connection, the injection of the seal liquid, and the introduction of the fluid are performed in this order.

The flange adapter 1 of the present embodiment
The method of connecting 01 to the pipe side 1/2 inch flange 22 and the pressure receiving portion 42 and the arrangement other than the flange adapter 101 after the connection are the same as those in the first embodiment.

When injecting the seal liquid, first loosen and remove the seal liquid injecting plug 63, inject a predetermined amount of the seal liquid from this, and then loosen the drain bleeding plug 5 and the air bleeding plug 6 to drain the drain. Air near the hole 5a and the air vent hole 6a is released to tighten the drain vent plug 5 and the air vent plug 6, and the seal liquid injection plug 63
Attach.

When introducing the fluid, with the seal liquid injection plug 63 loosened, the stop valve 21a is opened to introduce the fluid and the air inside is expelled, and when the fluid comes out from the seal liquid injection plug 63. Seal liquid injection plug 6
Tighten 3. Note that the expelling of air is not particularly necessary when the fluid is gas.

A remote seal is achieved by the above-mentioned connection, sealing liquid injection, and fluid introduction work to the pipe side 1/2 inch flange 22 from the orifice upstream side of the pipe 20 and the pipe side 1/2 inch flange 22 from the orifice downstream side. After the installation of the diaphragm type differential pressure transmitter is completed,
When the pressure of the fluid on the upstream side of the orifice of 0 and the pressure of the fluid on the downstream side of the orifice are 0,
a, It is transmitted to the remote seal diaphragm type differential pressure transmitter main body 40 via the capillary tube 41. The subsequent operation is the same as that in the first embodiment.

As described above, in the flange adapter 101 of the second embodiment, the pressure receiving diaphragm 42a receives the fluid pressure through the sealing liquid stored in the sealing liquid storage portion 61a with the second flange portion 2 substantially parallel to the horizontal plane. Therefore, it is possible to avoid the failure of the remote seal diaphragm type differential pressure transmitter due to the high temperature fluid and the corrosion of the pressure receiving diaphragm due to the corrosive fluid. In order for the sealing liquid injected into the sealing liquid reservoir 61a to exhibit its performance, the deviation of the surface of the second flange portion 2 in contact with the pressure receiving portion 42 from the horizontal plane must be within a certain allowable range. There is a 1/2 inch nozzle 2 that comes out of the pipe 20
In order to correspond to all directions of 1
Several kinds of settings are required as the angle θ formed by 0 and the rear part 61.

Embodiment 3 FIG. 6 is a partial cross-sectional side view showing the structure of a flange adapter 102 according to Embodiment 3 of the present invention, where 64 is an intermediate step portion provided between the front step portion 60 and the rear step portion 61, and 65 is the front step portion 60. And the middle section 64
And the relay section. Incidentally, 62 is a middle stage portion 64 and a rear stage portion 6
It is a relay unit with respect to the first embodiment, and other configurations are the same as those in the second embodiment.

Flange adapter 10 of the second embodiment
No. 1 was difficult to apply in a special case in which the 1/2 inch nozzle 21 was projected vertically upward from the pipe 20. The flange adapter 102 of the present embodiment is
The communication part 3 is formed by connecting the linear front stage part 60, the middle stage part 64, and the rear stage part 61 by the relay parts 65 and 62. Even when it appears, the same effect as in the second embodiment can be obtained.

Fourth Embodiment FIG. 7 is a partial cross-sectional side view showing the structure of the flange adapter 103 according to the fourth embodiment of the present invention, and 66 is a front stage portion formed by a flexible tube. The other structure is the same as that of the second embodiment.

In the flange adapter 103 of the present embodiment, since the front end portion 66 is formed of the flexible tube, when the first flange portion 1 is connected to the pipe side 1/2 inch flange 22, the second flange portion The direction of the part 2 can be freely changed.

Therefore, as shown in FIGS. 7A and 7B, the 1/2 inch nozzle 21 and the pipe side 1 /
No matter what angle the 2 inch flange 22 extends to, the surface of the second flange portion 2 that contacts the pressure receiving portion 42 can be made substantially parallel to the horizontal plane. Various angles of the 1/2 inch flange can be accommodated.

In the description of each of the above embodiments, the case where the pressure receiving portion 42 and the second flange portion 2 are connected by bolting has been described. However, for example, the pressure receiving portion 42 and the second flange portion 2 are connected. Other connection methods, such as a method of sandwiching between the two sides, may be adopted.

[0064]

As described above, according to the invention of claim 1, the pipe is connected to the 1/2 inch flange at the end of the 1/2 inch nozzle for introducing the fluid from the pipe whose flow rate is measured. A first flange portion and a pressure receiving portion having a pressure receiving diaphragm at the end of the capillary tube of the remote seal diaphragm type differential pressure transmitter, a concave portion formed in a region including a region facing the pressure receiving diaphragm. A second flange portion that is provided and is connected to the pressure receiving portion; and a communication portion that connects the second flange portion and the first flange portion to communicate between the 1/2 inch nozzle and the pressure receiving diaphragm. Since it is configured so that when connecting the pipe and the remote seal diaphragm type differential pressure transmitter, the pipe side is left with a general 1/2 inch nozzle and 1/2 inch flange. Simply connect the 1st flange part of this flange adapter to the 1/2 inch flange on the piping side, and connect the 2nd flange part to the pressure receiving part at the end of the capillary tube of the remote seal diaphragm type differential pressure transmitter. There is an effect that the pipe and the remote seal diaphragm type differential pressure transmitter can be connected easily and easily. Therefore, special work such as a support base when installing the remote seal diaphragm type differential pressure transmitter is not required, and the installation cost can be reduced.

Further, since the concave portion is formed in the area of the contact surface of the second flange portion with the pressure receiving portion including the area facing the pressure receiving diaphragm, the fluid comes into contact with the entire surface of the pressure receiving diaphragm to obtain an accurate pressure. By being transmitted to the pressure receiving diaphragm, there is an effect that an accurate flow rate measurement can be performed.

Further, since the above instrumentation is simplified and the cost is reduced, it is not necessary to circulate the pressure guiding tube, and the remote seal diaphragm type differential which can be applied to the case of high temperature, high viscosity, coagulability and corrosive fluid There is an effect that the pressure transmitter can be widely and easily applied not only to the above fluids but also to general fluids.

According to the second aspect of the present invention, since the drain removal is provided in the second flange portion, it is easy to remove the drain of the connection portion from the state where the pipe side 1/2 inch flange and the pressure receiving portion are connected. There is an effect that it can be performed with good workability.

According to the invention of claim 3, since the air vent is provided at a position substantially opposite to the drain vent,
Draining and air bleeding of the connection part can be done easily and with good workability from the state where the 1/2 inch flange on the piping side and the pressure receiving part are connected. In addition, the remote seal diaphragm type differential pressure transmitter There is an effect that zero adjustment can be performed at any time.

According to the invention of claim 4, when the first flange portion is connected to the 1/2 inch flange on the pipe side, the surface of the second flange portion which comes into contact with the pressure receiving portion is substantially parallel to the horizontal plane. Configured by changing the direction of the communicating portion, and, in the communicating portion, when the first flange portion is connected to the pipe side 1/2 inch flange and the second flange portion is connected to the pressure receiving portion, Since the pressure receiving diaphragm is configured so as to accommodate a predetermined amount of sealing liquid in which the entire pressure receiving diaphragm is immersed, the pressure receiving diaphragm does not come into direct contact with the fluid and the pressure of the fluid is passed through the sealing liquid in the sealing liquid reservoir. Therefore, there is an effect that it is possible to avoid the failure of the remote seal diaphragm type differential pressure transmitter due to the high temperature fluid and the corrosion of the pressure receiving diaphragm due to the corrosive fluid.

According to the invention of claim 5, since at least a part of the communication portion is formed by the flexible tube, the second flange is formed when the first flange portion is connected to the 1/2 inch flange on the pipe side. The direction of the flange can be changed freely, and no matter what angle the 1/2 inch nozzle from the pipe and the 1/2 inch flange on the piping side come out, the surface that contacts the pressure receiving part of the second flange Has the effect that it can be made substantially parallel to the horizontal plane.
It is not necessary to produce many kinds of flange adapters corresponding to various angles of the inch flange, and the same effect as the invention according to claim 4 can be obtained.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing a structure of a flange adapter 100 according to Embodiment 1 of the present invention.

FIG. 2 is an explanatory diagram showing a state in which a pipe side 1/2 inch flange and a pressure receiving portion of a remote seal diaphragm type differential pressure transmitter are connected using the flange adapter 100 according to the first embodiment.

FIG. 3 is a front view of the flange adapter 100 according to the first embodiment as viewed from the second flange portion 2 side.

FIG. 4 is a flange adapter 100 according to the first embodiment.
Of pipe side 1/2 inch flange 22 and pressure receiving portion 42
It is explanatory drawing which shows the connection with.

FIG. 5 is a partial cross-sectional side view showing the structure of a flange adapter 101 according to Embodiment 2 of the present invention.

FIG. 6 is a partial sectional side view showing the structure of a flange adapter 102 according to Embodiment 3 of the present invention.

FIG. 7 is a partial cross-sectional side view showing the structure of a flange adapter 103 according to the fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a connection between a conventional pressure-guide-tube-connected type differential pressure transmitter and a pipe for measuring a flow rate.

FIG. 9 is a perspective view showing the external appearance of a remote seal diaphragm type differential pressure transmitter.

FIG. 10 is an explanatory diagram showing a connection between a remote seal diaphragm type differential pressure transmitter and a pipe for measuring a flow rate.

[Explanation of symbols]

 100, 101, 102, 103 Flange adapter 1 First flange portion 2 Second flange portion 3 Communication portion 4 Recessed portion 5 Drain drain plug (drain drain) 5a Drain drain hole (drain drain) 6 Air vent plug (air vent) 6a Air Vent hole (air bleed) 20 Piping 21 1/2 inch nozzle 22 Piping side 1/2 inch flange 40 Remote seal diaphragm type differential pressure transmitter main body 41 Capillary tube 42 Pressure receiving part 42a Pressure receiving diaphragm 61a Seal liquid reservoir 66 Pre-stage part ( Flexible Tube)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoichiro Matsumoto 2-12-19 Shibuya, Shibuya-ku, Tokyo Yamatake Honeywell Co., Ltd.

Claims (5)

[Claims] 1. A first flange portion connected to a 1/2 inch flange on a piping side of a 1/2 inch nozzle for introducing the fluid from a pipe whose flow rate is measured, and a remote seal diaphragm type differential pressure transmission. On the contact surface with the pressure receiving part having the pressure receiving diaphragm at the end of the capillary tube of the vessel,
A second flange portion, which has a recess formed in a region including a region facing the pressure receiving diaphragm and is connected to the pressure receiving unit, connects the second flange unit and the first flange unit, A flange adapter comprising: a communication portion that communicates between the 1/2 inch nozzle and the pressure receiving diaphragm. 2. The flange adapter according to claim 1, wherein the second flange portion is provided with a drain vent. 3. The flange adapter according to claim 2, further comprising an air vent at a position substantially opposite to the drain vent. 4. The first flange portion is 1/2 on the piping side.
When connected to an inch flange, the communicating portion is turned such that the contact surface of the second flange portion with the pressure receiving portion is substantially parallel to the horizontal plane, and the communicating portion has the first flange. A portion for connecting a 1/2 inch flange on the pipe side and a second flange portion for connecting the pressure receiving portion with a sealing liquid reservoir for containing a predetermined amount of sealing liquid into which the entire pressure receiving diaphragm is immersed. The flange adapter according to any one of claims 1 to 3, wherein the flange adapter is provided. 5. The flange adapter according to claim 4, wherein at least a part of the communication portion is formed of a flexible tube.