JP2009002700A - U-tube type manometer and measuring method using this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a U-tube type manometer 1 which enables easy reading of a pressure difference. <P>SOLUTION: The U-tube type manometer 1 is so constituted that a liquid is put in the intermediate part of a U-tube 10 and sealed, pressures at two spots being measuring objects for a pressure difference are introduced into the U-tube 10 at both sides of the liquid, a difference is produced in liquid level on both sides of the liquid according to the difference between these introduced pressures, and this pressure difference is acquired by reading with a dial plate attached with a scale. The dial plate 20 is so constituted as to be movable vertically. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a U-shaped manometer and a measurement method using the same.

  It may be necessary to measure a pressure difference between one location and another location for maintenance / operation management in a plant facility. For example, as a method of inspecting the clogging state of a nozzle for injecting gas, the flow rate of gas is measured from the pressure difference between the upstream and downstream of the orifice provided in the supply pipe to the nozzle to inspect whether the nozzle is clogged. be able to. In such a case, with an off-the-shelf U-shaped manometer (see, for example, Non-Patent Document 1), the operator reads the scales on the high-pressure side and the low-pressure side and subtracts them to calculate the pressure difference.

However, when the plant facility is in operation, the pressure may fluctuate little by little, so that it is difficult to read each pressure from the scale, and further, both the high-pressure and low-pressure scales are read instantaneously and read 2 It is more difficult to instantaneously determine whether an appropriate differential pressure can be secured after calculating the difference from the two values.
Yamada Co., Ltd./Product Introduction / Manometer / U-shaped Manometer [online] [Search on December 20, 2006] Internet <URL: http://www.yamada-kk.com/product-k4.htm>

  An object of this invention is to provide the U-shaped manometer which can read a pressure difference easily with respect to such a subject.

In the first invention, a liquid is sealed in an intermediate portion of a U-shaped tube, and two pressures to be measured for pressure difference are introduced into the U-shaped tube on both sides of the liquid, and the difference between the introduced pressures is measured. A U-tube type manometer configured to cause a level difference between the liquid levels on both sides of the liquid and to read the level difference with a scaled plate,
The scale plate is a U-shaped manometer that is configured to be movable up and down.

A second invention is a U-shaped manometer according to the first invention,
A U-tube type manometer comprising a driving means for driving the scale plate up and down.

A third invention is the U-tube manometer according to the first invention,
A U-tube manometer comprising a fastener for fixing the scale plate at an arbitrary position.

A fourth invention is the U-tube manometer according to the first invention,
The scale plate is provided on the liquid surface on the side where a high pressure is introduced among the two pressures so that the level of the liquid surface and the reference point of the scale plate coincide with each other. It is a U-shaped manometer characterized by the following.

  According to the present invention, it is possible to provide a U-shaped manometer that can easily read a pressure difference.

  FIG. 1 is an overall configuration diagram of a U-tube type manometer 1 according to an embodiment of the present invention. As shown in the figure, the U-shaped tube type manometer 1 of this embodiment includes a U-shaped tube 10, a scale plate 20, a driving means 30, and the like.

  The U-shaped tube 10 is a transparent tube made of glass, resin, or the like, and is a tube that is curved in a U shape in the vicinity of the central portion and is linear in parallel with each other on both sides of the curved portion. The U-shaped tube 10 is filled with liquid so as to completely fill the curved portion. This liquid may be any liquid that is chemically stable and not volatile, and may be colored with ink or the like so as to be easily visible. Hereinafter, the liquid sealed in the U-shaped tube 10 is referred to as a sealed liquid. Introduced pipes 11 a and 11 b for introducing two pressures, which are measurement objects, are connected to both ends of the U-shaped pipe 10.

  The scale plate 20 is installed in parallel between the straight portions 10a and 10b of the U-shaped tube 10 and is a plate with a scale indicating the liquid level position of the straight portions 10a and 10b. By visually reading the level difference between the liquid levels on both sides from the scale plate 20, the difference in pressure introduced from the introduction pipes 11a and 11b can be read. The scale plate 20 is colored differently depending on the range of the allowable value of the pressure difference and the range exceeding the allowable upper limit, and the pressure difference is the allowable upper limit (for example, the pressure difference is 5.0 kpa in the example of FIG. 1). If you exceed the limit, you can see at a glance. Further, in order to make the pressure difference more visible, as shown in the example of FIG. 2, the scale plate 20 may be provided with a horizontal bar 22a indicating a reference point, and further indicates an allowable upper limit value of the pressure difference. A horizontal bar 22b may be provided.

  The scale plate support member 21 supports the scale plate 20 from the back surface and can be moved up and down by the drive means 30.

  The driving means 30 is constituted by, for example, a handle and a gear meshed with a rack provided on the scale plate support member 21, and when the handle is rotated, the scale plate support member 21 is moved up and down by a rack and pinion mechanism. Accordingly, the scale plate 20 also moves up and down. However, the structure of the drive means 30 is not limited to this, and any structure that can drive the scale plate support member 21 up and down may be used.

  Next, a procedure for measuring a pressure difference using the U-shaped manometer 1 will be described. When the pressure difference is to be measured, the handle of the driving means 30 is turned, and the U-tube straight portions 10a and 10b have a lower liquid level (that is, the high pressure side; in this specification, the straight portion 10a and The reference point of the scale plate 20 is aligned with the liquid level position of And if the scale corresponding to the liquid level position of the high level (namely, low pressure side; in this specification, it is set as the linear part 10b) of the straight part of a U-shaped pipe is read, the value will be a measured value of a pressure difference. It becomes. At this time, since the scale plate 20 is colored differently between the allowable range of the differential pressure and the range exceeding the allowable value as described above, it can be determined at a glance whether the pressure difference is within a predetermined allowable value. .

  The pressure difference may be measured by measuring the liquid level position on the low level side with the liquid level position on the high level side as a reference point. In this case, the scale of the scale plate 20 is attached so that the value increases from top to bottom.

  As described above, according to the U-shaped tube manometer 1 of the present embodiment, by adjusting the position of the reference point of the scale plate 20 to one liquid level position and reading the other liquid level position from the scale plate 20, The value of the pressure difference can be easily measured. At that time, the scale of the scale plate 20 is colored with a different color from the upper limit of the allowable value, so that it can be seen at a glance whether the differential pressure is within the allowable range. Further, by providing the horizontal bar 22a indicating the reference point of the scale plate 20, the position of the reference point can be more accurately and easily adjusted to the liquid level. Further, by providing the horizontal bar 22b indicating the allowable upper limit value, it can be instantaneously determined whether or not the differential pressure is within the allowable range.

  FIG. 3 shows a U-tube manometer 300 that is the second embodiment of the present invention. In FIG. 3, the same components as those in FIG.

  In the U-shaped manometer 300 of the present embodiment, a guide groove 24 extending vertically is provided on the surface of the scale plate indicating member 21, and a protrusion provided on the back surface of the scale plate 20 is engaged with the guide groove 24. By doing so, the scale plate 20 is guided so as to be movable in the vertical direction. Further, the U-shaped manometer 300 includes a fastener 23 for fixing the scale plate 20 to the scale plate support member 21. The fastener 23 can be easily attached and detached, and is, for example, a lock-type knob that is unlocked when pulled and locked when pushed, or a screw-type knob that can be detached by rotating. In the embodiment shown in FIG. 3, the number of the fasteners 23 is one, but may be two or more.

  When the pressure difference is to be measured, the fastener 23 is removed and the scale 23 is calibrated so that the reference point of the scale plate 20 is aligned with the liquid surface position of the straight portion 10a on the lower side of the U-shaped tube. The plate 20 is fixed. And the value of a pressure difference can be measured if the scale corresponding to the liquid level position of the straight-line part 10b of the high level side of a U-shaped tube is read.

  As described above, according to the U-shaped tube manometer 300 of the present embodiment, the position of the scale plate 20 can be adjusted to one liquid level position by attaching and detaching the fastener 23, and therefore the other liquid level position is set. By reading, the pressure difference can be easily read.

  FIG. 4 shows a U-tube manometer 400 that is the third embodiment of the present invention. In FIG. 4, the same components as those in FIG.

  In the U-tube type manometer 400 of the present embodiment, the scale plate 20 floats in the sealed liquid in a state where the reference point of the scale plate 20 coincides with the liquid surface position in the straight portion 10a on the low level side. Is installed. In addition, you may make it the scale plate 20 face the vertical direction stably by attaching | subjecting the weight 25 to the lower part of the scale plate 20. FIG.

  In the U-tube manometer 400, the reference point of the scale plate 20 is always at the liquid level of the straight portion 10a on the lower U-tube level, so the straight portion on the higher U-tube level. If the liquid level position of 10b is read from the scale of the scale plate 20, the value of the pressure difference can be measured.

  As described above, according to the U-shaped tube manometer 1 of another embodiment, the position of the scale plate 20 can be adjusted to one liquid level position without being operated, and therefore, by reading the other liquid level position. The pressure difference can be easily read.

  In addition, the description of the above embodiment is for facilitating understanding of the present invention, and does not limit the present invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof.

1 is an overall configuration diagram of a U-tube manometer 1 according to an embodiment of the present invention. It is a whole block diagram which shows the modification of the U-tube type manometer 1 which is this embodiment. It is a whole block diagram of the U-tube type manometer 300 which is the 2nd Embodiment of this invention. It is a whole block diagram of the U-shaped manometer 400 which is the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 U-shaped tube type manometer 10 U-shaped tube 11 Introducing tube 20 Scale plate 21 Scale plate support member 22 Horizontal bar 23 Fastener 24 Fastener groove 25 Weight 30 Driving means

Claims (5)

A liquid is sealed in an intermediate portion of the U-shaped tube, and two pressures to be measured for pressure difference are introduced into the U-shaped tube on both sides of the liquid, and according to the introduced pressure difference, A U-shaped manometer configured to cause a level difference between the liquid levels on both sides and to read the level difference with a scale plate with a scale,
The scale plate is configured to be movable up and down, and is a U-shaped manometer. A U-tube manometer according to claim 1,
A U-shaped manometer comprising drive means for driving the scale plate up and down. A U-tube manometer according to claim 1,
A U-shaped manometer comprising a fastener for fixing the scale plate at an arbitrary position. A U-tube manometer according to claim 1,
The scale plate is provided on the liquid surface on the side where a high pressure is introduced among the two pressures so that the level of the liquid surface and the reference point of the scale plate coincide with each other. U-shaped manometer characterized by A liquid is sealed in an intermediate portion of the U-shaped tube, and two pressures to be measured for pressure difference are introduced into the U-shaped tube on both sides of the liquid, and the liquid is changed according to the introduced pressure difference. A pressure difference measurement method using a U-shaped manometer configured to cause a level difference between the liquid levels on both sides and read the level difference with a scale plate with a scale,
A pressure difference measuring method, wherein the level of the other liquid level is read by the scale plate in a state where the reference point of the scale plate is matched with the level of one liquid level.