JP2005134136A - Self-recording pressure measuring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-recording pressure measuring system which is a device for recording pressure variation on a chart by transmitting the movement of Bourdon tube to a penholder, is easy in manufacturing and assembling, and is devised to easily and surely adjust the error of the Bourdon tube due to scattering in manufacturing. <P>SOLUTION: To an attachment base 14 where a root end of the Bourdon tube 13 is attached, two left and right attachment axes 15, 16 are provided. On the attachment base plate side of the device, a fulcrum hole 15X and a long hole 17 are formed. By fitting one attachment axis in the fulcrum hole and the other attachment axis in the long hole, the attaching angle of the Bourdon tube to the attachment base plate 6 is freely controlled in the constitution. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a self-recording pressure measuring apparatus capable of measuring various pressures such as water pressure, gas pressure, or fluid pressure in plant piping, and more specifically, for example, a water pipe network Pressure information of the water distribution system and the distribution pipe network over time, pressure monitoring after leak repair, pressure check of the installed pump or pressure reducing valve, or water pipe The present invention relates to a self-recording pressure measuring device suitable for a pressure test after road laying work.

  7 to 9 illustrate the configuration of a conventional self-recording pressure measuring device found in Patent Document 1 proposed by the present applicant, and FIG. 7A is a plan view showing an example thereof. 7B is a plan view of the chart paper on which the pressure is recorded, FIG. 8 is a plan view showing the internal structure of the apparatus, and FIG. 9 is a side view thereof.

  The conventional self-recording pressure measuring device XT shown in FIG. 7 to FIG. 9 includes a chart paper receiving base 50, a pressure supply pipe 30 piped on the bottom side thereof, and pressure and gas pressure sent through the pipe 30. A Bourdon tube 33 which is deformed by expansion due to various fluid pressures, and moves the pipe tip 33 '(see FIG. 8), a span adjustment arm 34 having one end attached to the pipe tip 33', and A link mechanism comprising a non-linear adjustment arm 35 that is pivotally connected to the span adjustment arm 34 so as to intersect in a substantially cross shape using a connection pin 33A.

  Further, the self-recording pressure measuring device XT is rotated by a rotating arm 37 connected to the tip of the non-linear adjusting arm 35 using a shaft 36, and the rotating arm 37. Further, a rotary shaft 38 that is rotatably mounted in a gear box 40 provided on the bottom surface of the chart paper tray 50, a balance spring 39 that is mounted on the rotary shaft 38, and an upper side of the chart paper tray 50. The pen shaft arm 41 attached to the protruding upper end portion 38T of the rotating shaft 38 is provided, and the whole is made into a portable shape.

  Further, a pen shaft 41A made of a felt pen or the like is attached to the tip of the pen shaft arm 41, and the amount of movement of the tube tip 33 'of the Bourdon tube 33 that is moved by pressure is determined by the above-described link mechanism or It is transmitted to the pen shaft 41A through a connecting member such as the pen shaft arm 41 and the like on the surface of the chart paper CP which rotates on the rotating table (not shown) such as a turntable on the upper surface of the chart paper receiving base 50. As shown in FIG. 7B, the pressure recording DT is left. In FIGS. 7A and 9, reference numeral 41B denotes a pen tip adjustment knob used when the pen shaft 41 is aligned with the zero point of the chart paper CP.

  When manufacturing and shipping the conventional self-recording pressure measuring device XT configured as described above, it is necessary to adjust manufacturing errors. That is, the position (see FIG. 8) of the tube tip 33 'of the Bourdon tube 33 is slightly different for each device to be assembled due to manufacturing variations. Further, the amount of movement of the tube tip 33 ′ of the Bourdon tube 33 varies depending on various conditions such as the cross-sectional shape, dimensions, plate thickness, and elastic modulus of the material, and is an apparatus manufactured and assembled in the same way. However, there is a problem that an error occurs. Further, when the scale is equally spaced, an error due to the nonlinearity of the link mechanism is added in addition to the structural error.

  The error includes a pressure span and a non-linear error. The pressure span is adjusted by increasing or decreasing the length of the crank, that is, the length from the pipe tip 33 'of the span adjusting arm 35 to the connecting pin 33A. If the position of the connecting pin 33A is shifted and the length of the crank is adjusted to be short, the rotation angle of the pen shaft 41A is increased with respect to the movement of the tube tip 33 'of the Bourdon tube 33. be able to.

  On the other hand, the ratio of the movement of the tube tip 33 ′ of the Bourdon tube 33 and the rotation angle of the pen shaft 41 </ b> A is sometimes the case where the span adjusting arm 35 and the nonlinear adjusting arm 35 are connected at right angles by the connecting pin 33 </ b> A. The least. Therefore, the non-linear error can be corrected by changing the length of the non-linear adjustment arm 35, that is, the length from the shaft 36 to the connecting pin 33A, and the non-linear adjustment arm 35 can be adjusted short. In this case, the deflection of the pen shaft 41A in the low pressure range can be increased.

  Therefore, conventionally, as shown in FIG. 8, a small hole for connection is narrowed in the length direction of each of the span adjustment arm 34 and the non-linear adjustment arm 35 which are connected using the connection pin 33A. By arranging a plurality of parallel arrangements and moving the connecting positions of the adjusting arms 34 and 35 by the connecting pin 33A in accordance with the position of each small hole at the time of inspection or shipment of the product, the above error can be obtained. Was adjusting.

  However, in the conventional adjustment method described above, the pressure span and the nonlinearity cannot be adjusted independently. If the pressure span is adjusted by changing the position of the connecting pin 33A, the nonlinearity also changes. There is a problem that the pressure span changes, and in addition, the zero point changes in any case, so eventually, span adjustment and non-linear correction are repeated alternately, and the zero point is readjusted each time. The work must be within a specified range, and the work is complicated even though the error cannot be adjusted sufficiently.

In addition, each of the adjustment arms 34 and 35 must be provided with a plurality of small holes for adjustment in parallel with a narrow interval, which is cumbersome to manufacture, and the adjustment and assembly described above. There is also a problem that the manufacturing cost is increased due to the complexity of each of the above operations.
Japanese Patent Laid-Open No. 2003-194650

  Therefore, the technical problem to be solved by the present invention is that a self-recording pressure measuring device is devised so that it can be easily and reliably performed and is easy to manufacture and assemble, and adjusts the error of the Bourdon tube due to manufacturing variations. Is to provide.

(1) In order to solve the above technical problem, the self-recording pressure measuring device according to claim 1 of the present invention moves the tip of a Bourdon tube that moves when various fluid pressures such as water pressure and gas pressure are applied. This is a self-recording pressure measuring device that records the change in pressure by transmitting the amount to the pen shaft on the chart paper, and attaches the root end of the Bourdon tube to the mounting base, and this is applied to the mounting substrate provided on the device side. The mounting angle of the Bourdon tube relative to the mounting substrate can be varied by configuring the mounting angle of the mounting base so as to be adjustable.

(2) Further, in the self-recording pressure measuring device according to claim 2 of the present invention, two mounting shafts are provided on the mounting base portion to which the root end portion of the Bourdon tube is mounted, and the mounting substrate on the device side is provided. Corresponding to these two mounting shafts, a fulcrum hole and a mounting hole for adjusting the mounting angle are provided, and one mounting shaft is rotatably fitted in the fulcrum hole, and the other mounting shaft is inserted into the long hole. By movably fitting, it is possible to change the mounting angle of the mounting base and the Bourdon tube with respect to the mounting board, and by tightening the other mounting shaft itself or by tightening the tightening member mounted on the mounting shaft, The mounting angle of the mounting base is configured to be fixed at an arbitrary angle.

  According to the present invention described in the above (1) and (2), the error (position error) of the Bourdon tube caused by the variation in accuracy at the time of manufacture can be changed by changing the mounting angle of the Bourdon tube. However, in the present invention, in particular, the adjustment of the error can be performed by a very simple operation of adjusting the mounting angle of the mounting base with respect to the mounting board, as shown in FIG. Since there is no need to provide a complicated link mechanism in which a large number of small holes are arranged side by side as in the conventional device, it is possible to reduce the cost for adjusting the error of the pipe tip. The economy that can reduce the manufacturing cost of the pressure measuring device itself can be exhibited.

  The best mode for carrying out the self-recording pressure measuring apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the main part of the present invention, and FIG. 3 is a bottom view showing an example, FIG. 3 is a plan view of the main part of the present invention shown in FIG. 1, and FIG. 4 is a bottom view of the same. The pressure measuring device has a substantially ring shape with the chart paper cradle 2, the pressure supply pipe 14 </ b> K piped on the bottom side thereof, and the root end portion connected to the pressure supply pipe 14 </ b> K via the mounting base 14. A Bourdon tube 13 is formed, and a pen shaft arm 3 is provided continuously to the tube tip 13Z side of the Bourdon tube 13.

  Various fluids such as water pressure and gas sent through the pressure supply pipe 14K flow into the Bourdon tube 13 through the mounting base 14, and the pen shaft arm which is deformed by the pressure and connected to the tube tip 13Z. The pen shaft 4 such as a felt pen attached to the tip of the pen shaft arm 3 is moved into a circular shape that rotates on a turntable (not shown) such as a turntable on the upper surface of the chart paper cradle 2. A record DT based on the change in fluid pressure as shown in FIG. 7B is written on the surface of the formed sheet of paper CP. Further, 2X is a rotating shaft of the rotating disk, and 2Y is a movement thereof.

  Reference numeral 10 denotes a pipe tip fitting attached to the pipe tip 13Z of the Bourdon tube 13, reference numeral 6 denotes a mounting board (board frame) provided inside the apparatus 1 so as to be positioned below the chart paper tray 2, and reference numeral 5 denotes a mounting position. The drive shaft is rotatably attached to the substrate 6, and the root end portion of the pen shaft arm 3 described above is attached horizontally and integrally to the upper end portion 5 </ b> T of the drive shaft 5. 8 is a U-shaped arm having one end fixed to the lower end of the drive shaft 5, and 5X is a fastening nut attached to the lower end of the drive shaft 5, and the other end of the U-shaped arm 8 is connected to the U-arm. The link 9 is rotatably connected using a pin or shaft 11, and the lower end portion of the link 9 is bent into a substantially L-shape of the pipe fitting 10 using the connecting pin or shaft 12. 10T is rotatably connected.

  In FIG. 1, 5A and 5B are nuts attached to the drive shaft 5, 5S is a coil spring wound between the nuts 5A and 5B, and 7 is a space between the attachment substrate 6 and the chart paper base 2. By attaching both ends of the coil spring 5S to the attachment shaft 7 with the attachment shaft attached to the coil spring 5S, the coil spring 5S is configured to exhibit the action of returning the drive shaft 5 and the pen shaft arm 3 to the zero point position. Yes.

  Therefore, when the pipe tip fitting 10 of the Bourdon tube 13 is moved by the pressure feeding, the drive shaft 5 rotates via the link 9 and the U-shaped arm 8, so that the pen shaft arm 3 moves along the radial direction of the chart paper CP. Then, the pen shaft 4 can write the fluid pressure change record DT on the surface of the chart paper CP.

  3 and 4, X is the span (rotation angle) of the pen shaft arm 3, XA is a line indicating the zero point position of the pen shaft arm 3 (pen shaft 4) when no load is applied, and XB is the maximum. This is a line indicating the position of the pen shaft arm 3 (pen shaft 4) when the pressure is received. In FIG. 1, 7X is a tightening nut for the mounting shaft 7, and 5R and 7R in FIGS. 2 and 3 are mounting holes for the drive shaft 5 and the mounting shaft 7 provided on the mounting substrate 6.

  Reference numerals 15 and 16 are left and right mounting shafts mounted on the bottom diagonal line of the mounting base 14, and 15X and 17 (see FIG. 2) are provided on the mounting substrate 6 so as to correspond to the mounting shafts 15 and 16 of the mounting base 14. A fulcrum hole and a long hole for adjusting the mounting angle. The long hole 17 is formed in the long direction along the radial direction of the circle-shaped chart paper CP, that is, the span X direction of the pen shaft arm 3. .

  One mounting shaft 15 of the mounting base 14 described above is rotatably fitted in the fulcrum hole 15X provided so as to be located inside the Bourdon tube 13, and provided so as to be located outside the Bourdon tube 13. The other mounting shaft 16 of the mounting base portion 14 is movably fitted into the mounting angle adjusting long hole 17.

  Y is a mounting angle adjustment range of the mounting base portion 14 centered on one mounting shaft 15 fitted in the fulcrum hole 15X, that is, a mounting angle adjustment range of the Bourdon tube 13 attached to the mounting base portion 14, and the Bourdon tube The span X of the pen shaft arm 3 attached to the pipe tip 13 is adjusted by using the attachment angle adjusting long hole 17 to attach the attachment angle of the attachment base 14 when attaching the Bourdon tube 13 to the attachment substrate 6 side. In addition, the mounting angle is fixed by tightening the mounting shafts 15 and 16 or by tightening nuts mounted on the mounting shafts 15 and 16.

  5 and 6 show another embodiment of the link mechanism for transmitting the movement of the pipe fitting 10 of the Bourdon tube 13 to the drive shaft 5. In the embodiment shown in FIG. One end of the U-shaped arm 8A is rotatably connected to the tip of the link 9 fixed to the lower end of the drive shaft 5 using a pin or shaft 11, and the other end is connected using a pin or shaft 12. It is connected to the lower end portion 10T of the pipe tip 10 so as to be rotatable. On the other hand, in the embodiment shown in FIG. 6, the driving shaft 5 and the pipe fitting 10 are connected using the two links 8B and 9 and the pins or shafts 11 and 12 without using the U-arm. It has a very simple configuration.

  Since the self-recording pressure measuring device according to the present invention is configured as described above, the error of the tube tip 13Z of the Bourdon tube 13 caused by the manufacturing variation, that is, the error of the position of the tube tip 13Z with respect to the mounting substrate 6 is determined. By changing the mounting angle of the Bourdon tube 13 by changing the mounting angle of the mounting base 14, it can be easily adjusted.

The side view which showed the principal part of the self-recording pressure measuring apparatus which concerns on this invention. The bottom view which expanded and showed the structure of the attachment board | substrate part which comprises the principal part of this invention. The top view which showed the principal part of the self-recording pressure measuring apparatus which concerns on this invention. The bottom view of the principal part of this invention shown in FIG. The block diagram explaining the other Example of this invention. The block diagram explaining the other Example of this invention. (A) is a plan view showing an example of a conventional apparatus, and (B) is a plan view of a chart paper on which a change in pressure is recorded. The top view which showed the principal part of the conventional apparatus. The side view which showed the principal part of the conventional apparatus.

Explanation of symbols

CP Chart paper DT Pressure recording 1 Self-recording pressure measuring device 2 Chart paper cradle 3 Pen shaft arm 4 Pen shaft 5 Drive shaft 6 Mounting board (board frame)
10 Pipe fitting 13 Bourdon tube 13Z Pipe 14 Mounting base 15, 16 Mounting shaft 15X Support hole 17 Long hole for adjusting mounting angle X Pen shaft arm span Y Bourdon tube mounting range adjustment range

Claims (2)

A self-recording pressure measuring device that records the change in pressure by transmitting the amount of movement of the Bourdon tube tip that moves when various fluid pressures such as water pressure and gas pressure are applied to the pen shaft on the chart paper,
By attaching the root end of the Bourdon tube to the mounting base and adjusting the mounting angle of the mounting base with respect to the mounting substrate provided on the device side, the mounting angle of the Bourdon tube with respect to the mounting substrate can be varied. A self-recording pressure measuring device characterized by comprising: Two mounting shafts are provided on the mounting base to which the root end of the Bourdon tube is mounted, and the mounting board on the device side corresponds to these two mounting shafts and the length for adjusting the mounting angle. By providing a hole, one mounting shaft is rotatably fitted into the fulcrum hole, and the other mounting shaft is movably fitted into the elongated hole, so that the mounting base and the Bourdon tube can be attached to the mounting substrate at an angle. In addition to being configured to be changeable, the mounting angle of the mounting base can be fixed at an arbitrary angle by tightening the other mounting shaft itself or by tightening a tightening member mounted on the mounting shaft. The self-recording pressure measuring device according to claim 1.

Images