JP7300918B2 - Pilot governor and reverse-acting pressure regulator equipped with it - Google Patents

Description

The present invention relates to a pilot governor used as a reverse-acting pressure regulating device and a reverse-acting pressure regulating device having the pilot governor.

Conventionally, a reverse acting pressure regulator and a pilot governor used therein are known as pressure regulators capable of controlling the displacement of the main valve body of the main governor when the secondary pressure rises or falls below the set pressure. (See Patent Document 1).
On the other hand, as one method of analyzing control systems, frequency response analysis is known, which examines control characteristics from responses to inputs such as sine waves. The frequency response analysis is often used in electrical and mechatronic systems, but it can of course also be applied to pressure regulators such as pilot governors, which are feedback control devices that do not require electricity. For example, in a pilot type governor, the input signal is the secondary pressure that is input to the pilot, and the output signal is the secondary pressure in the main valve downstream piping. As pressure, the stability of the system can be determined by performing a frequency response analysis for inputs at various frequencies.

JP 2017-182718 A

As described above, when conducting frequency response analysis of a pilot type governor or a pilot governor, it is necessary to apply a sine wave or the like, which is periodic vibration, to the secondary pressure detection chamber as an input signal. However, in a pilot type governor or a pilot governor used in a generally known reverse acting pressure regulating device as disclosed in Patent Document 1, the driving pressure discharged from the driving pressure chamber flows into the secondary pressure detection chamber. Therefore, an accurate sine wave cannot be given as an input signal. For example, by reducing the pipeline resistance of the secondary side pressure introducing path that is connected to the secondary pressure detection chamber, the driving pressure discharge resistance from the secondary side pressure introducing path can be reduced. However, in this method, it is not possible to apply a method of airtightly configuring the secondary pressure detection chamber and forcibly changing its volume to give a sine wave as pressure.

The present invention has been made in view of the above-mentioned problems, and its object is to be able to appropriately apply an actual pressure sine wave or the like as an input, to be able to measure the driving pressure as its output response, and to be able to control from these values. It is an object of the present invention to provide a pilot governor of a reverse-acting pressure regulating device capable of executing frequency response analysis for analyzing characteristics, and a reverse-acting pressure regulating device having the pilot governor.

To achieve the above objectives, the pilot governor should:
A pilot governor used as a reverse acting pressure regulating device, characterized by:
A first chamber partitioned by a housing and a first diaphragm and communicating with a secondary pressure introduction path, and an open hole partitioned by the housing, the first diaphragm and the second diaphragm and open to the outside. A second chamber formed in the housing, and a primary side pressure introduction passage partitioned by the housing, the second diaphragm, and the third diaphragm are connected in communication, and driving pressure is introduced into the driving pressure chamber of the main governor. a third chamber to which a driving pressure introduction passage is connected, and a first biasing member that biases the third diaphragm toward the third chamber,
a connecting member that connects the first diaphragm, the second diaphragm, and the third diaphragm so that they have the same amount of displacement in a displacement direction;
In the displacement direction, the primary side pressure introduction end is opened and closed by being biased by the second biasing member from the side of the second diaphragm toward the primary side pressure introduction end, which is the introduction end of the primary side pressure introduction passage. an exhaust valve for adjusting an inflow amount of the primary side fluid introduced from the primary side pressure introduction end to the third chamber;
an open valve that is connected to the exhaust valve and opens and closes an opening formed in the second diaphragm to adjust the amount of discharge released from the third chamber side to the second chamber side; be.

The three-diaphragm pilot governor having the characteristic configuration described above has a different configuration from the two-diaphragm pilot governor generally used as a conventional reverse acting pressure regulating device. When the secondary pressure rises, all the diaphragms descend and the drive pressure is discharged (in the case of a three-diaphragm configuration, it is discharged to the outside via the second chamber, and in the case of a two-diaphragm configuration, the secondary pressure When the secondary pressure drops, the drive pressure is supplied to the main governor, so basically it exhibits the same frequency response characteristics as a pilot governor with two diaphragms. it is conceivable that.
Furthermore, according to the pilot governor having the above characteristic configuration, the exhaust pressure released from the third chamber via the open valve is guided to the second chamber and not to the first chamber. , a secondary pressure can be introduced as an input unperturbed by the discharge pressure.
As a result, the pilot governor having the characteristic structure described above can be utilized as a pilot governor that can obtain substantially the same frequency response characteristic as the pilot governor of a generally used reverse-acting pressure regulating device.
Therefore, a pilot governor for a reverse-acting pressure regulating device can be realized that can appropriately input an actual pressure sine wave, etc. as an input and that can use the output as a driving pressure to perform a frequency response analysis that analyzes the control characteristics from those values. can.

The pilot governor having the above characteristic configuration can be used for verification to know the frequency response characteristics of the conventional pilot governor as described above, and can also be put to practical use as a pilot governor for a reverse-acting pressure regulator. can also

A further characteristic configuration of the pilot governor according to the present invention is
The connection member is configured by a hollow member having a hollow interior.

In the pilot governor according to the present invention, it is necessary to provide a connecting member that connects the three diaphragms. A case of increasing in size in the direction of displacement is assumed.
According to the above characteristic configuration, the connection member is made of a hollow member whose interior is processed to be hollow, so that weight reduction can be achieved, and even if the size becomes large, the increase in weight can be suppressed. , it is possible to suppress fluctuations in frequency response characteristics due to weight increase.

A further characteristic configuration of the pilot governor according to the present invention is
a pressure vibration applying unit that applies periodic pressure vibration to the first chamber;
a first pressure measuring unit capable of measuring a simulated secondary pressure accompanied by the periodic pressure oscillation introduced into the first chamber;
and a second pressure measuring section capable of measuring the driving pressure introduced into the driving pressure introducing passage.

According to the above characteristic configuration, the periodic pressure vibration can be input to the first chamber by the pressure vibration applying unit as the simulated secondary pressure, and the periodic pressure vibration measured by the first pressure measuring unit and the periodic pressure vibration Response analysis can be performed for the frequency of the pilot governor based on the driving pressure that is generated along with and measured by the second pressure measuring unit.
Then, for example, by creating a Bode diagram from the amplitude and phase of the simulated secondary pressure vibration accompanied by the periodic pressure vibration and the amplitude and phase of the driving pressure vibration for each of a plurality of frequencies, the gain margin and the phase margin are calculated. can be derived and from those values the stability of the system can be suitably determined.
Since this determination is based on analysis based on actual measurements, it is possible to make determinations that are more realistic than methods based on numerical analysis that presuppose various assumptions.

As a pilot governor according to the present invention,
The amplitude and phase of the simulated secondary pressure vibration introduced into the first chamber measured by the first pressure measuring unit, and the driving pressure introduction path measured by the second pressure measuring unit A controller is preferably provided that performs a frequency response analysis based on the amplitude and phase of the drive pressure oscillation.

However, even if the pilot governor of the present invention is not provided with a control device, even if it adopts a configuration in which the measured values of the first pressure measurement unit and the second pressure measurement unit are analyzed by another arithmetic device. I do not care.

A characteristic configuration of the pressure regulating device for achieving the above object is that it includes the pilot governor described above.

According to the characteristic configuration described above, it is possible to realize a reverse-acting pressure regulator that satisfactorily exhibits the unique effects of the pilot governor described above.

1 is a schematic configuration diagram of a pilot governor according to an embodiment of the present invention; FIG. FIG. 4 is an action diagram when the pilot governor according to the embodiment of the present invention operates; FIG. 4 is a graphical representation of the simulated secondary pressure with periodic pressure oscillations as input to the pilot governor, and a graphical representation of the drive pressure as output;

The pilot governor 100 according to the embodiment of the present invention and the reverse-acting pressure regulating device 200 equipped with the same can appropriately input an actual pressure sine wave or the like as an input, and can measure the driving pressure as its output response. It relates to being able to perform frequency response analysis that analyzes control characteristics from those values.

As shown in FIG. 1, the reverse-acting pressure regulating device 200 includes a reverse-acting main governor 10 that adjusts the secondary pressure of the fluid flow path L0 to a set pressure, and a pilot that introduces driving pressure to the main governor 10. A governor 100 is provided.

The main governor 10 has a main diaphragm D0 provided along the diaphragm plate 14, and the internal space thereof is divided into a fifth chamber H5 and a sixth chamber H6 by the main diaphragm D0. The main governor 10 includes a main valve body V0 that opens and closes a main opening K0 provided in the fluid flow path L0. It is configured to be opened and closed in a form that moves in conjunction with. A main biasing spring G0 that biases the main diaphragm D0 in the valve closing direction of the main valve body V0 is disposed in the fifth chamber H5.

The pilot governor 100 includes a first chamber H1 partitioned by the housing K and the first diaphragm D1 and connected to the secondary side pressure introduction path L2, and the housing K, the first diaphragm D1 and the second diaphragm D2. A second chamber H2 in which an open hole K1 that is partitioned and opened to the outside is formed in the housing K, and a primary side pressure introduction path L1 that is partitioned by the housing K, the second diaphragm D2, and the third diaphragm D3 are communicated. and a third chamber H3, to which a driving pressure introduction path L4 for introducing driving pressure into a sixth chamber H6 (an example of a driving pressure chamber) of the main governor 10 is communicated and connected; A connection that connects the first biasing member G1 that biases to the side, the first diaphragm D1, the second diaphragm D2, and the third diaphragm D3 so that they have the same amount of displacement in the displacement direction (direction of arrow Z in FIG. 1). The member R is biased by the second biasing member G2 from the side of the second diaphragm D2 in the displacement direction toward the primary pressure introduction end L1a, which is the introduction end of the primary pressure introduction path L1, to introduce the primary pressure. an exhaust valve V1 that opens and closes the end L1a to adjust the amount of inflow of the primary side fluid introduced from the primary side pressure introduction end L1a into the third chamber H3; It also has an open valve V2 that opens and closes the formed opening DP2a to adjust the amount of discharge to escape from the third chamber H3 side to the second chamber H2 side.
Here, the drive pressure introduction path L4 is connected to the secondary side pressure introduction path L2 via a third fluid flow path L3 having a throttle 39 that narrows the flow path diameter. In addition, the end of the first biasing member G1 on the opposite side to the third diaphragm D3 is attached to a receptacle G2a provided so as to be screwed into a female threaded portion G2b provided on the inner peripheral surface of the housing K. The tray G2a is configured to be freely movable in the displacement direction (the arrow Z direction in FIG. 1) by rotating while being screwed into the female screw portion G2b.

The first diaphragm D1 is provided with a first diaphragm plate DP1, the second diaphragm D2 is provided with a second diaphragm plate DP2, and the third diaphragm D3 is provided with a third diaphragm plate DP3. The member R is provided in a form that connects the first diaphragm plate DP1, the second diaphragm plate DP2, and the third diaphragm plate DP3.

By appropriately setting the biasing forces of the first biasing member G1 and the second biasing member G2 in the above-described configuration, when the secondary pressure P2 in the fluid flow path L0 rises above the set pressure, FIG. ), the first diaphragm D1, the second diaphragm D2, and the third diaphragm D3 are pushed against the biasing force of the first biasing member G1 by increasing the pressure in the first chamber H1. It is displaced to the biasing member G1 side. As a result, the exhaust valve V1 is closed and the release valve V2 is opened, thereby stopping the introduction of the primary pressure P1 into the third chamber H3 and reducing the pressure in the third chamber H3 to the second pressure. It is discharged to the outside through the chamber H2 and the open hole K1. As a result, the pressure in the sixth chamber H6 is discharged to the outside through the driving pressure introduction path L4, the opening DP2a, and the opening K1. The main diaphragm D0 is displaced toward the sixth chamber H6 due to the pressure difference with the chamber H6. Therefore, the main valve body V0 of the main governor 10 is operated to the closing side, the secondary pressure P2 in the fluid flow path L0 is decreased, and the secondary pressure P2 is adjusted to the set pressure.
The opening degree of the opening DP2a is designed to increase as the pressure difference between the secondary pressure P2 and the set pressure increases.

On the other hand, when the secondary pressure P2 of the fluid flow path L0 drops below the set pressure, as shown in FIG. The pressure in the first chamber H1 of the pilot governor 100 is lowered, and the biasing force of the first biasing member G1 displaces the first diaphragm D1, the second diaphragm D2, and the third diaphragm D3 toward the first chamber H1. do. As a result, the exhaust valve V1 operates to open and the release valve V2 operates to close, and the primary side of the fluid flow path L0 is introduced into the third chamber H3 via the primary side pressure introduction path L1. H3 pressure rises. Then, the increased pressure of the third chamber H3 is introduced as a driving pressure into the sixth chamber H6 of the main governor 10 via the driving pressure introduction path L4, and the pressure of the sixth chamber H6 also increases, and the pressure of the fifth chamber H5 and the sixth chamber H6, the main diaphragm D0 is displaced toward the fifth chamber H5. Therefore, the main valve body V0 of the main governor 10 is operated to the opening side, the secondary pressure P2 in the fluid flow path L0 is increased, and the secondary pressure P2 is adjusted to the set pressure.

Now, the pilot governor 100 having three diaphragms that has been explained so far, when the simulated secondary pressure P2 accompanied by periodic pressure oscillation is applied to the first chamber H1 as the secondary pressure detection chamber, Patent Document 1 ( It has the following configuration so as to obtain substantially the same frequency response characteristics as the pilot governor having two diaphragms used in the conventional reverse acting pressure regulator disclosed in Japanese Patent Application Laid-Open No. 2017-12718. there is

The effective pressure-receiving areas of the first diaphragm D1, the second diaphragm D2, and the third diaphragm D3 are configured to be substantially equal, and preferably, the effective pressure-receiving areas are equal to those of the diaphragms of the conventional reverse-acting pilot governor. Constructed equal to the area.
Further, the connecting member R that connects the first diaphragm D1, the second diaphragm D2 and the third diaphragm D3 extends, for example, along the displacement direction (direction of arrow Z in FIG. 1) and the first diaphragm plate DP1 and the second diaphragm. A plurality of rod-shaped members R1 (in this embodiment, two members with a hollow interior) connecting the plate DP2 and the third diaphragm plate DP3 can be used.

In addition, the relationship between the secondary pressure P2, the stroke of the exhaust valve V1, and the mass of the vibrating portion provides substantially the same performance as that of the conventional pilot governor. Incidentally, the vibratable portion includes the connecting member R, the first diaphragm D1, the second diaphragm D2, and the third diaphragm D3. More strictly, the above relationship is also affected by the masses of the exhaust valve V1, open valve V2, first diaphragm D1, second diaphragm D2, and third diaphragm D3.

Further, in order to introduce a simulated secondary pressure accompanied by periodic pressure oscillation as an input into the first chamber H1 as a secondary pressure measurement chamber, the secondary pressure introduction passage L2 is provided in the secondary pressure introduction passage L2. An on-off valve 51 for switching between opening and closing is provided.
Furthermore, a pressure vibration generator 50 (an example of a pressure vibration applying unit) that applies periodic pressure vibration to the first chamber H1 is provided for the first chamber H1. It is composed of a pressure introduction valve V3 for controlling pressure introduction to the first chamber H1 and a pressure release valve V4 for controlling pressure discharge from the first chamber H1. In addition to the explanation, the pressure introduction valve V3 is provided in a form that opens and closes the primary side pressure introduction path L1 that communicates with the first chamber H1, and the pressure release valve V4 communicates with the first chamber H1. It is provided in such a manner as to open and close the atmosphere release flow path L5.
In a state where the on-off valve 51 is closed, the control device C alternately switches and controls the opening and closing of the pressure introduction valve V3 and the pressure discharge valve V4 based on the pressure value detected by the first pressure sensor S1. Vibration can be generated.

Furthermore, a first pressure sensor S1 (an example of a first pressure measuring unit) capable of measuring the simulated secondary pressure accompanied by periodic pressure vibration introduced into the first chamber H1 is located on the first chamber H1 side of the on-off valve 51. is provided in Furthermore, a second pressure sensor S2 (an example of a second pressure measuring unit) capable of measuring the driving pressure is provided in the driving pressure introduction path L4, and the controller C controls the first pressure sensor S1 and the second pressure sensor S2. It is configured to be able to receive the pressure measured by.
The control device C controls the amplitude and phase of the simulated secondary pressure vibration accompanied by the periodic pressure vibration introduced into the first chamber H1 measured by the first pressure sensor S1 and the drive pressure measured by the second pressure sensor S2. A frequency response analysis is performed based on the amplitude and phase of the pressure oscillation.

Now, an example of the frequency response analysis method of the pilot governor 100 explained so far will be explained.

The operator closes the on-off valve 51 to isolate the first chamber H1 and the secondary side of the fluid flow path L0 so as to inhibit pressure propagation.
Next, the control device C sets the frequency of the periodic pressure vibration generated in the pressure vibration generator 50 to an initial value (for example, the minimum value of a plurality of frequencies is set: 0.1 Hz as an example), The pressure vibration generator 50 executes a pressure vibration imparting step of generating periodic pressure vibrations with a set frequency.
After that, the control device C performs a pressure vibration measurement step of receiving the pressure as a simulated secondary pressure associated with the periodic pressure vibration measured by the first pressure sensor S1 at the set frequency, and the second pressure sensor S1. A driving pressure measurement step of receiving the driving pressure measured in S2 is executed.
At a predetermined set frequency, the simulated secondary pressure as an input to be measured and the drive pressure as an output have values as shown in FIG. 3, for example. Incidentally, the frequency set in FIG. 3 is 0.5 Hz. In FIG. 3, the measured values are plotted and their sine approximations are shown by curves.

The control device C increases the frequency of the periodic pressure vibration generated by the pressure vibration generator 50 step by step. Here, it is preferable that the frequency is exponentially increased until the set frequency of the periodic pressure vibration reaches a predetermined upper limit.
Next, the control device C outputs a Bode diagram from the amplitude and phase of the simulated secondary pressure vibration accompanying the periodic pressure vibration measured for each frequency and the amplitude and phase of the driving pressure vibration.
Specifically, the amplitude A1 of the simulated secondary pressure accompanied by the periodic pressure oscillation measured in the pressure oscillation measurement step and the amplitude A2 of the drive pressure measured in the drive pressure measurement step are measured for each of a plurality of different measured frequencies. A gain output step of outputting the gain G derived from the ratio of the , for each of a plurality of frequencies, and a phase and drive of the simulated secondary pressure accompanied by the periodic pressure oscillation measured at each of a plurality of different frequencies in the pressure oscillation measurement step and a phase output step of outputting the difference from the phase of the driving pressure measured in the pressure measurement step for each of a plurality of frequencies, and the gain output in the gain output step and the phase output in the phase output step. Plot the difference on a Bode plot.

The control device C calculates the stability of the pilot governor 100 based on the Bode diagram created from the gain margin derived from the gain output in the gain output process and the phase margin derived from the phase output process. Perform a stability determination step to determine.

[Another embodiment]
(1) The first pressure sensor S1 may directly measure the pressure in the first chamber H1 as the secondary pressure detection chamber.
Further, the driving pressure measured by the second pressure sensor S2 may be the secondary pressure of the downstream pipe of the main valve body V0.

(2) Other structural examples of the pressure generating device 50 include, for example, a roots pump that vibrates the internal pressure of the first chamber H1, and a chamber that heats and cools the chamber communicating with the first chamber H1. It is also possible to employ a configuration in which pressure vibration is generated by expansion/contraction of the gas inside.

It should be noted that the configurations disclosed in the above embodiments (including other embodiments, the same shall apply hereinafter) can be applied in combination with configurations disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in this specification are exemplifications, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention.

The pilot governor of the present invention and the reverse-acting pressure regulating device equipped with the pilot governor can appropriately input an actual pressure sine wave or the like as an input, and can measure the driving pressure as its output response. can be effectively used as a pilot governor of a reverse-acting pressure regulating device capable of executing frequency response analysis, and a reverse-acting pressure regulating device having the pilot governor.

10: Main governor 14: Diaphragm plate 100: Pilot governor 200: Reverse acting pressure regulator D1: First diaphragm D2: Second diaphragm D3: Third diaphragm G1: First biasing member G2: Second biasing member H1 : First chamber H2 : Second chamber H3 : Third chamber K : Housing K1 : Open hole L0 : Fluid flow path L1 : Primary side pressure introduction path L1a : Primary side pressure introduction end L2 : Secondary side pressure introduction path L4 : Driving pressure introduction path P1 : Primary pressure P2 : Secondary pressure R : Connecting member V0 : Main valve body V1 : Exhaust valve V2 : Release valve

Claims (5)

A pilot governor used as a reverse acting pressure regulator,
A first chamber partitioned by a housing and a first diaphragm and communicating with a secondary pressure introduction path, and an open hole partitioned by the housing, the first diaphragm and the second diaphragm and open to the outside. A second chamber formed in the housing, and a primary side pressure introduction passage partitioned by the housing, the second diaphragm, and the third diaphragm are connected in communication, and driving pressure is introduced into the driving pressure chamber of the main governor. a third chamber to which a driving pressure introduction passage is connected, and a first biasing member that biases the third diaphragm toward the third chamber,
a connecting member that connects the first diaphragm, the second diaphragm, and the third diaphragm so that they have the same amount of displacement in a displacement direction;
In the displacement direction, the primary side pressure introduction end is opened and closed by being biased by the second biasing member from the side of the second diaphragm toward the primary side pressure introduction end, which is the introduction end of the primary side pressure introduction passage. an exhaust valve for adjusting an inflow amount of the primary side fluid introduced from the primary side pressure introduction end to the third chamber;
an open valve connected to the exhaust valve and opening and closing an opening formed in the second diaphragm to adjust the amount of discharge released from the third chamber side to the second chamber side. . 2. A pilot governor according to claim 1, wherein said connecting member comprises a hollow member having a hollow interior. a pressure vibration applying unit that applies periodic pressure vibration to the first chamber;
a first pressure measuring unit capable of measuring a simulated secondary pressure accompanied by the periodic pressure oscillation introduced into the first chamber;
3. The pilot governor according to claim 1, further comprising a second pressure measuring section capable of measuring the driving pressure introduced into the driving pressure introducing passage. The amplitude and phase of the simulated secondary pressure vibration introduced into the first chamber measured by the first pressure measuring unit, and the driving pressure introduction path measured by the second pressure measuring unit 4. The pilot governor of claim 3, comprising a controller that performs a frequency response analysis based on the amplitude and phase of the drive pressure oscillation. A reverse acting pressure regulator comprising the pilot governor according to any one of claims 1 to 4.

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