JPH1123399A - Fixing unit for pressure fluctuation sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the pressure fluctuation only of a fluid accurately by inserting a pressure fluctuation sensor into a through hole of a flange and fixing the sensor to a fixing plate such a vibration from an apparatus, e.g. a steam regulation valve, is not transmitted through the pipe wall to the sensor. SOLUTION: A vibration from a steam regulation valve on the upstream side of a pipe is transmitted through the pipe wall to a pipe base 2 for the pipe. The vibration is also transmitted to a flange 3 from a flange fixing bolt 9 for securing the pipe base 2 and the flange 3 through a gasket 4. Although, the vibration is transmitted to a sensor fixing plate 11 through a supporting bolt 5 and a bellows 6, a high frequency vibration is not transmitted because the supporting bolt 5 is constructed to have a constriction and the lateral rigidity thereof is low. It is also true for the bellows. Since the sensor fixing plate 11 is spaced apart from the pipe base 2 through a gasket ring 7, a high frequency vibration is not transmitted to a pressure fluctuation sensor 8 through the wall of the pipe. According to the structure, pressure fluctuation of a fluid can be measured accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mounting a pressure fluctuation sensor applied to pressure fluctuation measurement of a fluid pipe such as a steam pipe.

[0002]

2. Description of the Related Art FIG. 2 is a longitudinal sectional view showing a mounting portion of a conventional pressure fluctuation sensor. In the drawing, 1 is a steam control valve outlet pipe, S is a flow of steam flowing in the pipe, 10 is a boss mounted by welding to the pipe 1, and 8 is a pressure fluctuation sensor mounted in the boss. is there.

[0003]

In the conventional pressure fluctuation sensor mounting structure described above, the vibration generated from the steam control valve on the upstream side of the pipe is transmitted through the pipe wall of the pipe, directly to the pressure fluctuation sensor 8, and is transmitted to the pressure fluctuation sensor. Indistinguishable from pressure fluctuations
There was a problem with the reliability of the measurement of pressure fluctuation.

The present invention solves the above-mentioned drawbacks of the prior art, and prevents vibrations generated from devices such as a steam control valve from being transmitted to a pressure fluctuation sensor through a pipe wall so that pressure fluctuations of only a fluid can be accurately measured. It is an object of the present invention to provide a pressure fluctuation sensor mounting device.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in a pressure fluctuation sensor mounting device used for mounting a pressure fluctuation sensor on a pipe such as a steam pipe, a pipe welded to the pipe. A base, a flange having a through hole in the center, a flange fastened to an end of the nozzle through a gasket, and a nozzle having a through hole in the center, and a gasket ring mounted on the periphery. And a sensor mounting plate connected to the flange by a special support bolt having a constriction at the center in the axial direction, between the peripheral portion of the through hole of the flange and the peripheral portion of the through hole of the sensor mounting plate. A pressure fluctuation sensor is inserted from a through hole of the flange, and a pressure sensing portion is piped from a through hole of the sensor mounting plate. Is exposed to, to a pressure variation sensor mounting and wherein the mounting the sensor mounting plate.

[0006]

FIG. 1 is a longitudinal sectional view of a pressure fluctuation sensor mounting portion according to an embodiment of the present invention. In the drawing, 1 is a steam control valve outlet pipe, 2 is a nozzle installed by welding to the pipe, 3 is a flange having a through hole in the center, 9 is a flange 3 connected to the nozzle 2 via a gasket 4. Flange mounting bolts 11 to be mounted have a through hole in the center, and a sensor mounting plate 5 inserted through the gasket ring 7 inside the nozzle 2 is mounting the sensor mounting plate 11 to the flange. The four special support bolts 6 are stretched between the peripheral portion of the through hole of the sensor mounting plate 11 and the peripheral portion of the through hole of the flange 3, and bellows 8 are attached to the respective flanges by welding. The pressure fluctuation sensor S, which is inserted from the through-hole and exposes the pressure sensing portion from the through-hole of the sensor mounting plate 11 to the inside of the pipe and is mounted on the sensor mounting plate, is a steam flow in the pipe.

The bellows 6 prevents the steam in the pipe 1 from leaking out, the gasket ring 7 prevents the nozzle 2 from directly contacting the sensor mounting plate 11, and the special support bolt 5 controls the sensor. Since the pipe pressure acts on the mounting plate 11, it functions to support the pipe pressure. The support bolt is provided with a small-diameter constriction, which reduces the rigidity in the lateral direction and makes it difficult to transmit high-frequency vibration transmitted from the pipe wall of the pipe.

In the present apparatus, the vibration generated from the steam control valve on the upstream side of the pipe is transmitted through the pipe wall of the pipe and transmitted to the nozzle 2 provided on the pipe. A gasket 4 is sandwiched between the nozzle 2 and the flange 3, and is fixed with a flange mounting bolt 9. Vibration is transmitted from the flange mounting bolt 9 to the flange 3. Further, vibration is transmitted to the sensor mounting plate 11 via the support bolt 5 and the bellows 6, but since the support bolt 5 has a constricted structure, rigidity in a lateral direction is low, and high-frequency vibration is not transmitted. Of course, the same applies to the bellows 6. Since the sensor mounting plate 11 is spaced from the nozzle 2 by the gasket ring 7 so as not to contact the nozzle 2, the high-frequency vibration transmitted through the pipe wall of the pipe is not transmitted to the pressure fluctuation sensor 8. Thereby, the pressure fluctuation in the fluid can be correctly measured.

[0009]

According to the pressure fluctuation sensor mounting device of the present invention, there is provided a nozzle which is welded to a pipe, a flange which has a through hole in the center and is bolted to an end of the nozzle via a gasket, A sensor mounting plate connected to the flange by a special support bolt provided inside the nozzle through a gasket ring having a through hole in the center and attached to the periphery and having a neck at the center in the axial direction; and A bellows is stretched between a peripheral portion of the through hole of the flange and a peripheral portion of the through hole of the sensor mounting plate, and is attached to each by welding, and a pressure fluctuation sensor is inserted from the through hole of the flange. Since the pressure sensing portion is exposed to the inside of the pipe from the through hole of the sensor mounting plate and is mounted on the sensor mounting plate, high-frequency vibration transmitted from the pipe wall is prevented from being transmitted to the pressure sensor. Is, it is possible to correctly measure the pressure fluctuations in the fluid.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pressure fluctuation sensor mounting portion according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional pressure fluctuation sensor mounting portion.

[Explanation of Signs] 1 Steam control valve outlet piping 2 Nozzle 3 Flange 4 Gasket 5 Special support bolt 6 Bellows 7 Gasket ring 8 Pressure fluctuation sensor 9 Flange mounting bolt 10 Boss 11 Sensor mounting plate S Steam flow

Claims (1)

[Claims] 1. A pressure fluctuation sensor mounting device used when a pressure fluctuation sensor is mounted on a pipe such as a steam pipe, wherein the nozzle is welded to the pipe, has a through hole in the center, and has a gasket. A special support bolt provided inside the nozzle through a gasket ring having a through hole at the center and a through-hole at the center and having a neck at the center in the axial direction is provided by a bolt fastened to an end of the nozzle. A sensor mounting plate connected to the flange, and a bellows which is stretched between a peripheral portion of the through hole of the flange and a peripheral portion of the through hole of the sensor mounting plate, and is attached to each by welding; The fluctuation sensor is inserted through the through hole of the flange, and the pressure sensing portion is exposed to the inside of the tube from the through hole of the sensor mounting plate, and is attached to the sensor mounting plate. Pressure fluctuation sensor mounting device.