JPH03142612A - Pressure pulsation controller for fluid pipeline system - Google Patents

Abstract

PURPOSE:To absorb the pressure change over a wide frequency range by displacing a movable wall formed at a part of a pipeline to absorb the pressure change produced by the pulsation of the pipeline. CONSTITUTION:A movable wall 9 made of a rubber diaphragm is attached to a pipe wall 8 of a material pipeline 5 so as to block a cut part 7 of the wall 8. When the pressure change is produced in the pipeline 5 due to the pulsation of the material and a pressure signal 16 is fluctuated, a controller 15 outputs a vibrator drive signal 17 in response to the pressure change. Then an electromagnetic vibrator 11 retreats or protrudes the wall 9 out of or into the pipeline 5 with the rise or the fall of the pressure caused by the pulsation respectively. Thus the pressure change caused by the pulsation of the material is absorbed in the pipeline 5. Thus the pulsation can be attenuated over a wide frequency range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J] The present invention relates to a pressure pulsation control device for a fluid pipeline system.

[Prior Art] As a conventional pulsation damping means for a conduit system, an accumulator a as shown in FIGS. 9 and 1O is generally employed.

That is, an accumulator a whose interior is partitioned into a gas chamber C and a liquid chamber d by a rubber film is attached in the middle of a pipe e, and a liquid chamber d communicating with the pipe e receives the pulsations of the fluid in the pipe e. The pulsation of the fluid is absorbed by the compressibility of the gas sealed in the gas chamber C.

In addition, in the figure, f is an orifice.

[Problems to be Solved by the Invention] However, in the conventional method, since the accumulator a has unique characteristics, it is difficult to attenuate pulsations over a wide frequency range.

Further, since the conventional accumulator a is a passive type operated by the pulsation of fluid, there is a limit to the amount of pulsation attenuation, and the device becomes larger.

In the present invention, when pulsation occurs in the fluid in the fluid pipe, the pulsation is not activated by the fluid, but is actively absorbed by the activation of another mechanical means different from the pulsation of the fluid. It is an object of the present invention to provide a pressure pulsation control device for an active fluid line system.

[Means for Solving the Problems] In order to achieve the above object, the first aspect of the present invention includes a movable wall provided on a pipe wall of a fluid pipeline, and a movable wall connected to the movable wall. an actuator that moves in the radial direction of the fluid pipeline; a pressure sensor that is provided on the upstream side of the movable wall of the fluid pipeline and detects the pressure within the fluid pipeline; It has a configuration consisting of a controller that outputs a drive signal.

In a second aspect of the present invention, there is provided a movable wall provided on a pipe wall of a fluid conduit, an actuator connected to the movable wall and configured to move the movable wall in the radial direction of the fluid conduit, and A configuration consisting of a rotation angle sensor that detects the rotation angle of a rotating part of a rotary machine disposed on the upstream side of the movable wall, and a controller that outputs a drive signal for the actuator based on the rotation angle signal detected by the rotation angle sensor. have.

In a third aspect of the present invention, there is provided a movable wall provided on a pipe wall of a fluid conduit, an actuator connected to the movable wall and configured to move the movable wall in a radial direction of the fluid conduit, and a movable wall of the fluid conduit. A pressure sensor provided on the upstream side of the wall to detect the pressure in the fluid pipeline, a pressure sensor provided near the movable wall to detect the pressure in the fluid pipeline, and a controller that outputs a drive signal for the actuator. The controller receives the pressure signal detected by the pressure sensor on the upstream side of the movable wall, receives the pressure signal detected by the pressure sensor near the movable wall, and controls the pressure signal of the pressure sensor on the upstream side of the movable wall. It has a configuration in which parameters are corrected based on a pressure signal from a pressure sensor near the wall and the drive signal is output.

In a fourth aspect of the present invention, there is provided a movable wall provided on a pipe wall of a fluid conduit, an actuator connected to the movable wall and configured to move the movable wall in the radial direction of the fluid conduit, and a movable wall of the fluid conduit. A rotation angle sensor that detects the rotation angle of a rotating part of a rotating machine that is disposed on the upstream side of the wall, a pressure sensor that is provided near the movable wall that detects the pressure in the fluid pipeline, and a rotation angle sensor that detects A drive signal for the actuator is determined based on the rotation angle signal detected by the pressure sensor, and a parameter of a controller is corrected based on the pressure signal detected by the pressure sensor, thereby correcting the drive signal for the actuator, and driving the actuator based on the corrected drive signal. It has a configuration consisting of a controller.

Moreover, the fifth invention of the present invention is characterized in that the first, second, third,
The fourth aspect of the invention has a configuration in which a pressure balance chamber that covers the movable wall from the outside of the fluid conduit and can supply pressure fluid to the inside thereof is provided on the outside of the fluid conduit.

[Function] In the present invention, the actuator operates in response to pressure fluctuations on the upstream side of the movable wall or the rotation angle of the rotating part of the rotating machine,
When the pressure within the fluid pipeline increases, the movable wall retreats from within the fluid pipeline, and when the pressure within the fluid pipeline decreases, the movable wall protrudes into the fluid pipeline to prevent pressure changes due to fluid pulsation. Actively absorbed.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention, in which the pressure pulsation control device for a fluid piping system of the present invention is applied to a paper machine raw material piping system.

3 and 4 show the paper machine raw material piping system, l is a raw material tank that stores prepared slurry-like paper raw material (hereinafter simply referred to as raw material), and 2 is a raw material from the raw material tank L. 3 is a screen for removing foreign matter in the raw material; 4 is a paper machine; 5 is a raw material pipe that guides the raw material from the fan pump 2 through the screen 3 to the paper machine 4;
Reference numeral 6 denotes a pressure pulsation control device for a fluid pipe system according to the present invention, which is provided in the raw material pipe 5.

The raw material sent out from the raw material tank 1 by the fan pump 2 passes through the screen 3 and the pressure pulsation control device f8, flows into the head box 4b from the tapered header 4a of the paper making am4, and is further sliced 4C onto the wire 4d to an even thickness. be guided to become

FIG. 1 shows details of the pressure pulsation control device 6, in which 7 is a notch in which a part of the pipe wall 8 of the raw material pipe 5 is cut out, and 9 is a cutout in the pipe wall 8 so as to close the notch 7. A movable wall made of an attached rubber diaphragm, IO is a pressure balance chamber fixed to the pipe wall 8 so as to cover the movable wall 9 from the outer circumferential side of the raw material pipe 5, and LL is an electromagnetic chamber provided outside the pressure balance chamber 1G. A vibration exciter 12 is a vibration shaft of an electromagnetic vibrator 11 that extends through the pressure balance chamber 10 in a direction perpendicular to the raw material flow direction (direction of arrow A); and 13 is fixed to the approximate center of the movable wall 9; 14 is a pressure sensor for detecting the pressure of the raw material in the raw material pipe 5 provided on the upstream side of the movable wall 9 in the raw material distribution direction;
15 is a vibrator drive signal 1 for driving the electromagnetic vibrator 11 based on the pressure signal 1B output from the pressure sensor 14;
A controller 1B is an air supply pipe connected to the pressure balance chamber IO.

The operation of the first embodiment of the present invention will be described below.

When the paper machine 4 shown in FIGS. 3 and 4 is in operation, a pressure signal 16 output from the pressure sensor 14 is continuously input to the controller 15.

At this time, air pressure is applied to the pressure balance chamber 10 through the air supply pipe 18 so that the internal pressure of the pressure balance chamber 10 and the static pressure within the raw material pipe 5 are balanced.

When a pressure change occurs in the raw material pipe 5 due to the pulsation of the raw material and the pressure signal 16 fluctuates, the controller 15 outputs the vibrator drive signal 17 in response to the pressure change, and the electromagnetic vibrator 11
This causes the movable wall 9 to move backward from the inside of the raw material pipe 5 when the pressure increases due to pulsation, and to protrude into the raw material pipe 5 when the pressure decreases due to pulsation. Absorbs pressure changes due to raw material pulsation.

FIG. 2 is a control block diagram of the controller 15,
The transfer function cp of the raw material piping system, the pressure pulsation control device [controller 15 and actuator ('ts magnetic exciter 11
)] When the transfer function GC-Ga of the system completely matches,
Corresponding to the pressure Pr of the pressure sensor 14 shown in FIG.
A vibrator drive signal 17 is outputted from the controller 15 so that the movable wall 9 is displaced as described above, and the fluctuating pressure Pd at the movable wall 9 is absorbed.

Therefore, the transfer function Gc of the controller 15 may be made to satisfy GpIllGC-Ga by experimentally determining the transfer function Gp-Ga described above.

If the above formula holds true, the movable wall pressure Pd shown in FIG. 2 is: Pd −Gp @Pf' −Gc ・Ga ・Pf'−
(Gp-Gc-Ga) Pf'-〇.

If the input (travel amount) of the actuator 11 is U, it can be expressed as U cp @pr, and the above-mentioned Gc and pressure sensor pressure P
The movement of the actuator is determined by this, and pressure changes due to pulsation can be absorbed.

Specifically, the controller 15 performs a digital operation called an FIR (finite impulse response) filter as described below.

u(k)=Gc(Z-') ・P('(k)=
(Cg +C1Z-' +・-+Cn Z″rI)P
``(k) = CoP r(k) + C+ P ``(k
-1) + -1CnP r(k-n) Or, where, K: Sampling time of pressure sensor 14 Z-1: Delay operator (Z -1-P r(k) -P f'(k -1
)) As described above, if the pressure pulsation control device for a fluid piping system of the present invention is used in the raw material piping system of a paper machine, pressure changes due to pulsation of the raw material in the raw material piping 5 are absorbed, so that the flow of paper as a product is reduced. It is possible to prevent directional unevenness (basic weight fluctuation).

Further, since air pressure is applied to the pressure balance chamber IO through the air supply pipe 18 so as to balance the static pressure of the raw material in the raw material pipe 5, the electromagnetic vibrator 11 can be downsized.

FIG. 5 shows a second embodiment of the present invention, in which the pressure sensor 14 and controller 15 shown in FIG. A controller 21 is provided which calculates and outputs an exciter drive signal 17 for driving the electromagnetic exciter 11 based on the rotation angle signal 19.

In the second embodiment of the present invention, the raw material pulsation in the raw material pipe 5 is
The rotation angle sensor 20 focuses on the rotation speed of the screen 3 and the number of blades, and the rotation angle sensor 20 detects the rotation angle of the rotation blade of the screen 3 at a specific point on the rotation angle, that is, the rotation at which pulsation occurs, which has been determined experimentally. When the blade is located at the rotation angle, the rotation angle signal 19 is output, and the controller 21 performs calculations using the rotation angle signal 19 instead of P in the first embodiment. As in the first embodiment described above, it is possible to absorb pulsations in the raw material pipe 5 and prevent unevenness in the flow direction of the paper product.

Note that the rotation angle sensor 20 is designed to detect the rotation angle of the rotary blade of the screen 3 in FIG.
to detect the rotation angle of screen 3,
The rotation angles of both fan pumps 2 may be detected.

6 and 7 show a third embodiment of the present invention, and the parts in the figures with the same reference numerals as in FIG. 1 represent the same parts.

In FIG. 6, 22 is a pressure sensor installed near the movable wall 9 in the raw material pipe line 5, 23 is a pressure signal output from the pressure sensor 22, and 24 is a vibration exciter drive signal based on the pressure signal 16.23. This is a controller that calculates and outputs 17.

The operation of the third embodiment of the present invention will be described below.

When the paper machine is in operation, a pressure signal 16.23 output by the pressure sensor 14.22 is continuously input manually to the controller 24.

At this time, air pressure is applied to the pressure balance chamber IO through the air supply pipe 18 so that the internal pressure of the pressure balance chamber IO and the static pressure within the raw material pipe 5 are balanced.

When a pressure change occurs in the raw material pipe 5 due to the pulsation of the raw material and the pressure signal 16 fluctuates, the controller 24 outputs the vibrator drive signal 17 in response to the pressure change, and the movable wall 9 is moved by the electromagnetic vibrator U. When the pressure increases due to pulsation, it retreats from inside the raw material pipe 5, and when the pressure decreases due to pulsation, it moves to protrude into the raw material pipe 5 to absorb pressure changes due to the pulsation of the raw material inside the raw material pipe 5. do.

On the other hand, if the characteristics of the paper machine raw material piping system change for some reason, even if the movable wall 9 is displaced only in response to fluctuations in the pressure signal 16, it will not be able to sufficiently absorb the pressure change. Pressure changes also occur near the movable wall 9.

This pressure change is detected by the pressure sensor 22, and the controller 24 adjusts the parameter value based on the pressure signal 23, and outputs the vibrator drive signal 17 such that the pressure change detected by the pressure sensor 22 disappears. The movable wall 9 is displaced to absorb pressure changes due to pulsation of the raw material.

In the controller 24, as shown in FIG. 7, a digital operation called a FIR (finite impulse response) filter is performed to determine the above-mentioned vibrator input.

The coefficients of this FIR filter are, for example, LMS (minimum 2
By using the root mean mean) algorithm, even if the characteristics of the piping system, that is, the transfer function Gp described in the first embodiment, change for some reason during the operation of the paper machine raw material piping system shown in FIG. The parameter values of 24 are automatically adjusted to absorb pressure changes due to pulsation of the raw material in the raw material pipe 5.

In the LMS algorithm, the coefficient θ(k) of the FIR filter
, θ(k) l−θ(k−1) 1μP d(k) P ``(
k) ...(1) is updated using the parameter adjustment agent.

Here, k: sampling time θ(k) of the pressure sensor 22:
Current FIR filter parameter vector θ(k-1): Parameter vector before update μ: Constant coefficient Pd(k): Pulsating pressure acting on the movable wall at the current time Pf'
(k): Pressure vector of the pressure sensor 22 from the current time to n time ago.

At this time, = CoP + (k) 1C+ P r (k-1) +-
...+Cn PI'(k-n) The human power (movement) of the actuator 11 is determined by the calculation.

here, (Co.

1 Cn) Part 1 where θ represents the parameter vector of Gc.

As described above, in the third embodiment of the present invention, unlike the first embodiment, it is not necessary to obtain the parameter values of the controller 24 in advance, and the transfer functions cp and ca of the raw material piping system and the actuator system can be calculated. It is possible to absorb pressure changes due to raw material pulsation in the raw material piping 5 even if this is not known experimentally.

FIG. 8 shows a fourth embodiment of the present invention, and in the figure, parts given the same reference numerals as in FIGS. 5 and 6 represent the same parts.

In FIG. 8, 25 is a controller that calculates and outputs the vibration exciter drive signal 17 based on the rotation angle signal 19 and the pressure signal 23, and similarly to the controller 24 of the third embodiment described above, the controller 25 automatically calculates the parameters. The value can be adjusted.

The fourth embodiment of the present invention is similar to the second embodiment described above, in that the pressure change due to the pulsation of the raw material in the raw material pipe 5 occurs in relation to the rotation speed and the number of blades of the rotating blades of the screen 3. The movable wall 9 is displaced in response to the rotation angle signal 19 as in the second embodiment, and the controller 25 is automatically displaced based on the detected pressure signal 23 as in the third embodiment. The parameter values are adjusted to absorb pressure changes due to pulsation of the raw material in the raw material pipe 5.

It should be noted that the pressure pulsation control device for a fluid pipeline system of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the pressure pulsation control device for a fluid pipeline system of the present invention, various excellent effects as described below can be achieved.

(1) This is an active pressure pulsation control device that absorbs pressure changes caused by pulsations in the raw material piping by displacing a movable wall formed in a part of the raw material piping, so it does not work like a conventional passive type device. , regardless of the characteristics of the device.
It is possible to absorb pressure changes due to pulsations over a wide frequency range, and it is also possible to downsize the device.

(2) This is a feedforward method that absorbs pressure changes due to pulsation by displacing the movable wall based on the pressure on the upstream side of the movable wall or the rotation angle of the rotating part of a rotating machine, so in principle it is possible to completely cancel out pulsation. It has a great pulsation absorption effect.

(3) By providing a pressure balance chamber and applying pressure to the pressure balance chamber so as to balance the static pressure of the fluid whose pulsations are to be absorbed by the movable wall, it is possible to downsize the actuator; Furthermore, the entire device can be made compact.

[Brief explanation of the drawing]

Fig. 1 is a detailed diagram of the first embodiment of the present invention, Fig. 2 is a control block diagram of the controller of the first embodiment of the present invention, and Fig. 3 is a system diagram of the paper machine raw material piping system. Fig. J4 is a view taken along the line IV-IV in Fig. 3, Fig. 5 is a detailed view of the second embodiment of the present invention, Fig. 6 is a detailed view of the third embodiment of the present invention, and Fig. 7 is a detailed view of the third embodiment of the present invention. An explanatory diagram of the digital calculation method of the controller according to the third embodiment of the present invention, FIG. 8 is a detailed diagram of the fourth embodiment of the present invention, FIG. 9 is a conceptual diagram of the conventional device, and FIG. 1O is the conventional device FIG. In the figure, 2 is a fan pump (rotating machine), 3 is a screen (rotating machine), 4 is a paper machine, and 5 is a raw material pipe (fluid pipe).
, 6 is a pressure pulsation control device, 7 is a notch, 8 is a pipe wall, 9
is a movable wall, lO is a pressure balance chamber, and 11 is an electromagnetic exciter (
actuator), 14.22 is a pressure sensor, 15.
21, 24, and 25 are controllers, 16, 23 are pressure signals, 17 is an exciter drive signal (actuator drive signal), 18 is an air supply pipe, 19 is a rotation angle signal, and 20 is a rotation angle sensor. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Scope of Claims] 1) A movable wall provided on a pipe wall of a fluid conduit, an actuator connected to the movable wall and configured to move the movable wall in the radial direction of the fluid conduit, and a movable wall of the fluid conduit. A fluid pipeline system comprising: a pressure sensor provided on the upstream side to detect the pressure within the fluid pipeline; and a controller that outputs a drive signal for the actuator based on the pressure signal detected by the pressure sensor. Pressure pulsation control device. 2) a movable wall provided on a pipe wall of a fluid conduit, an actuator connected to the movable wall and configured to move the movable wall in the radial direction of the fluid conduit, and an actuator disposed upstream of the movable wall of the fluid conduit; A fluid piping system comprising: a rotation angle sensor that detects a rotation angle of a rotating part of a rotating machine; and a controller that outputs a drive signal for the actuator based on a rotation angle signal detected by the rotation angle sensor. pressure pulsation control device. 3) A movable wall provided on the pipe wall of the fluid pipe, an actuator connected to the movable wall and moving the movable wall in the radial direction of the fluid pipe, and an actuator provided on the upstream side of the movable wall of the fluid pipe to move the movable wall. The controller includes a pressure sensor that detects the pressure in the fluid pipeline, a pressure sensor that is provided near the movable wall and detects the pressure in the fluid pipeline, and a controller that outputs a drive signal for the actuator. In addition to receiving the pressure signal detected by the pressure sensor on the upstream side of the movable wall, the pressure sensor near the movable wall receives the pressure signal detected by the pressure sensor on the upstream side of the movable wall, and converts the pressure signal of the pressure sensor on the upstream side of the movable wall into the pressure signal of the pressure sensor near the movable wall. A pressure pulsation control device for a fluid pipeline system, characterized in that the drive signal is output after modifying parameters based on the signal. 4) a movable wall provided on a pipe wall of a fluid conduit, an actuator connected to the movable wall and configured to move the movable wall in the radial direction of the fluid conduit, and an actuator disposed upstream of the movable wall of the fluid conduit; a rotation angle sensor that detects the rotation angle of the rotating part of the rotary machine that is connected to the movable wall; a pressure sensor that is installed near the movable wall and detects the pressure in the fluid pipeline; a controller that determines a drive signal for the actuator, corrects the drive signal for the actuator by correcting parameters of the controller based on the pressure signal detected by the pressure sensor, and drives the actuator based on the corrected drive signal. Features: Pressure pulsation control device for fluid piping system. 5) The fluid pipe according to claim 1, 2, 3, or 4, characterized in that a pressure balance chamber is provided on the outside of the fluid pipe that covers the movable wall from the outside of the fluid pipe and can supply pressure fluid to the inside. Road system pressure pulsation control device.