JPS6129913A - Flow controller - Google Patents

Abstract

PURPOSE:To realize plural functions provided to each valve with one kind of specification of a flow controller by realizing selectively a reducing valve function, flow control valve function, 2-stage switching type reducing valve function and an emergency shut valve function with a mode designation operation only. CONSTITUTION:When the setting mode is a reducing mode (a), a valve 1 is operated automatically by keeping a detected pressure P2 of a secondary pressure sensor 11 within the permissible range of a setting pressure Ps. In case of the flow control mode (b), the valve 1 is operated automatically so as to keep the flow Q calculated by an operation circuit 12B within the permissible range of a setting flow Qs. In case of the 2-stage switching reducing mode (c), the detected pressure P2 is kept within the permissible range of the pressure Ps when the flow Q is less than the flow Qs, and the valve 1 is operated automatically so as to open fully the valve when the flow Q is the Qs or over. In case of the emergency shut mode (d), the valve 1 is operated automatically to keep the valve in the fully closed state when the flow Q is less than the Qs and so as to close fully the valve when the flow Q reaches the Qs.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flow rate control device for various transport fluids.
Specifically, a primary pressure sensor that detects the pressure of the transport fluid on the upstream side of the valve body, and a secondary pressure sensor that detects the pressure of the transport fluid on the downstream side of the valve body, and the information from these sensors The present invention relates to a flow rate control device including a controller that automatically opens and closes the valve body based on the flow rate.

[Conventional technology]

Conventionally, the above-mentioned flow rate control device includes (A) a pressure reduction device that automatically operates the valve body to maintain the detected secondary pressure within a set range based on the detection of the transport fluid secondary pressure on the downstream side of the valve body; valve.

(B) Based on the detection of the differential pressure between the transportation fluid secondary pressure and the transportation fluid secondary pressure on the upstream side of the valve body, the valve body is configured to maintain the flow rate calculated from the detected differential pressure within the set range. Automatically operated flow control valve.

(C) - When the flow rate calculated from the detected differential pressure between the next pressure and the secondary pressure is less than the setting, the detected secondary pressure is maintained within the set range, and when the calculated flow rate is above the setting, the valve is fully opened. A two-stage switching pressure reducing valve that automatically operates the valve body.

(D) - The valve is maintained in a fully open state when the flow rate calculated from the detected differential pressure between the next pressure and the secondary pressure is less than the set value, and the valve is fully opened when the calculated flow rate exceeds the set value. There were emergency shutoff valves that automatically operated the body, and each valve was equipped with a unique single function.

[Problem that the invention seeks to solve]

However, for manufacturers, equipping each valve with a unique single function leads to diversification of manufactured products, which is disadvantageous in terms of production management and production costs. There was a problem in that installing the valves at appropriate locations made construction management complicated.

An object of the present invention is to make it possible to perform multiple functions, which were conventionally provided in separate valves, in a flow control device with a -specification.

[Means for solving problems]

The characteristic configuration of the flow rate control device according to the present invention is as follows: - The following modes (a) to (d) are selected for the controller that automatically opens and closes the valve body based on information from both pressure detection sensors for bottom pressure and secondary pressure. (a) a pressure reduction mode that maintains the pressure detected by the secondary pressure sensor within a set range; (b) a flow rate calculated based on the differential pressure detected by the bottom pressure sensor and the secondary pressure sensor; (c) maintain the detected pressure of the secondary pressure sensor within the set range when the flow rate calculated by the differential pressure detected by the bottom pressure sensor and the secondary pressure sensor is less than the set range; and a two-stage switching pressure reduction mode in which the valve body is fully opened when the calculated flow rate is above the setting; (d) the flow rate calculated from the differential pressure detected by the bottom pressure and secondary pressure sensors is less than the setting; an emergency shutoff mode that maintains the valve body in a fully open state when the calculated flow rate exceeds a set value, and a set value input means for setting the flow rate and pressure; The controller includes: (a) pressure comparison means for comparing the detected pressure of the secondary pressure sensor and the set pressure of the set value input means; (Q) based on the detected pressures of the bottom pressure and secondary pressure sensors; (c) flow rate comparison means for comparing the flow rate calculated by the calculation means with the set flow rate of the set value input means; (d) the mode designation means, the set value input means, and the pressure comparison means. An operation specifying means is provided for applying an operation signal to the opening/closing operation section of the valve body to execute a set one of the modes (a) to (d) based on information from the means and the flow rate comparison means. In particular, its functions and effects are as follows.

[For production]

In other words, with the above configuration, the pressure reducing valve function, flow rate control valve function, two-stage switching pressure reducing valve function, and
The emergency shutoff valve function can be selectively activated.

〔Effect of the invention〕

As a result, the manufacturer can use a single specification for the product type, making production management easier, improving production efficiency, and thereby reducing production costs. Furthermore, on the construction side, after completing the installation of multiple devices, it is only necessary to specify the mode for each device, which saves the management of the installation location during installation. Modifications could be made without removing the main body, making construction management much easier and improving construction efficiency.

〔Example〕

Next, embodiments will be described based on the drawings.

FIG. 1 shows the schematic structure of the flow control device, and (1) shows the following:
The valve body with a crown (2) that opens and closes the flow path (F) in the valve body, (3) is the valve body-like flow path portion (
F+) and a cylinder chamber (4) for valve opening/closing operation using the valve body (1) as a piston.
The first electromagnetic valve is installed in the valve body, and when it opens, high-pressure fluid in the upstream passage (F) flows into the cylinder chamber (4), and fluid acts on the front and back surfaces of the valve body (1). By changing the pressure balance, the valve body (1) is closed and operated by the differential pressure between the fluid pressures acting on the front and back sides.

(6) is the flow marking part (in the valve box) downstream of the valve body (1).
This is a second solenoid valve installed in the second pilot flow path (7) that communicates the cylinder chamber (4) with the cylinder chamber (F2). By communicating with a low fluid pressure atmosphere and changing the balance of fluid pressures acting on the front and back sides of the valve body (1), the valve body (1) Open and operate.

(8) is a potentiometer that detects the opening degree (V) of the valve body (1) by detecting the stroke amount of the valve stem (9) accompanying the opening/closing operation of the valve body (1); (10) and (11) is the upstream flow path portion (Fl)
A sensor that detects the fluid pressure (p+) (hereinafter referred to as -Suita) in the downstream flow path section (F2)
A sensor (12) that detects the fluid pressure (F2) (hereinafter referred to as secondary pressure) at is based on information from the potentiometer (8) and repressure detection sensors (10) and (11). , operate both solenoid valves (3) and (6) so as to maintain the pre-specified valve control state.
) is a controller that automatically operates the

As shown in FIGS. 1 and 2, the control configuration for automatic valve control by the controller (12) includes a pressure reduction mode (a) in which the flow rate control device configured as described above functions as a pressure reduction valve. , a flow rate control mode (b) that functions as a flow rate control valve, a two-stage switching mode (C) that functions as a two-stage switching pressure reducing valve, and an emergency shut-off mode (d) that functions as an emergency shut-off valve. 12) is provided with a mode designation switch (13) that is selectively manually set, and the flow rate (Qs) and pressure (P, , ), which are the control targets in each control mode (a"d), are controlled. Vessel (12
) Keyboard for inputting setting values (14)
) is provided.

Then, a controller (1
2), (a) Detection pressure (F2) of the secondary pressure sensor (11)
A pressure comparison circuit (12A) that compares the set pressure (PS) and the set pressure (PS) artificially set using the set value input keyboard (14).
, (El) - Differential pressure between the detected pressure (Pl) of the Suita sensor (10) and the detected pressure (P2) of the secondary pressure sensor (11) (
In addition to calculating the valve opening (ΔP), the detected valve opening (V) of the potentiometer (8) is checked against the table (12b) in which the pressure loss coefficient (α) at each valve opening is stored in advance. The pressure loss coefficient (α) at time point V) is determined, and the calculated differential pressure (ΔP) and matching loss coefficient (α) are calculated using the flow rate function equation [0(8P,
(c) A keyboard (14) for inputting the flow rate (Q) calculated by the calculation circuit (12B) and the set value. A flow rate comparison circuit (12G
), (d) The four types of control are performed based on information from the mode designation switch (13), set value input keyboard (14), pressure comparison means (12A), and flow rate comparison means (12C). Both electromagnetic valves (3 ) and (6) are each provided with an operation designation circuit (12D) for providing an operation signal.

That is, automatic control is performed as shown in (i) to (iv) below depending on the setting mode.

(i) When the setting mode is in pressure reduction mode (a).

In the control flow shown in Fig. 2(a), the secondary pressure sensor (1
The valve body (1) is automatically operated so as to maintain the detected pressure (P2) in 1) within the permissible range of the set pressure (PS) [IP, -, pzl<ld+l].

(In the figure, d2 indicates another allowable value used for comparison during the flow, and +d++>1azl.) (ii) When the setting mode is the flow rate control mode (b).

In the control flow shown in FIG. 2(b), the arithmetic circuit (12
The flow rate (Q) calculated by B) is the set flow rate (port S).
The valve body (1) is automatically operated so as to maintain it within the allowable range [111, -ql<ld:+l].

(iii) Setting mode is two-stage switching decompression mode (c)
If there is.

In the control flow shown in FIG. 2(c), the arithmetic circuit (12B)
When the calculated flow rate (Q) is less than the set flow rate (ill, ), the detected pressure (P2) of the secondary pressure sensor (11)
, the allowable range of the set pressure (P, ,) [IPS-P21
<1dal, and the calculated flow rate (tl) is kept within the set flow rate (Q5
) The valve body (1) is automatically operated to fully open the valve at the above times.

(1v) When the setting mode is in emergency cutoff mode (d).

In the control flow shown in FIG. 2(d), the arithmetic circuit (12B)
The valve body ( 1
) to operate automatically.

[Another example]

The flow path opening/closing type of the valve body (1) that is automatically operated by the controller (12) can be of various types such as a gate valve type, a butterfly valve type, or a ball valve type.

The driving configuration of the valve body (1) is that instead of opening and closing using fluid pressure as in the previous embodiment, a motor using external power as a drive source or a valve body driving device such as a hydraulic cylinder is provided. Various configuration changes are possible, and the specific configuration of the valve body opening/closing operation parts (3), (6) such as the electromagnetic valves that operate the valve body drive configuration based on the operation signal from the controller (12). Various configuration changes are also possible.

Sensors for primary pressure and secondary pressure (10), (11)
To calculate the flow rate (Q) based on the detection of , if there is little variation in the - next pressure, the correction for the valve body opening based on the detected valve opening (v) of the potentiometer (8) is omitted. , Check only the differential pressure (ΔP) between the detected secondary pressure (Pl) and the detected secondary pressure (P2) against the flow rate value table 41 to determine the flow f.
You may try to find fi (Q) in a close-up manner, or,
Various improvements can be made to the specific calculation configuration for calculating the flow rate (Q), and these calculation configurations are collectively referred to as calculation means (
121+).

Furthermore, a configuration for selectively setting modes (a) to (d), a configuration for setting flow rate (QS) and pressure (PS), and a configuration for setting detected secondary pressure (P2) and set pressure (PS). A configuration that compares the calculated flow rate (Q) and a set flow rate (S), a configuration that compares the calculated flow rate (Q) and the set flow rate (S), and an opening/closing operation section (3) of the valve body (1) to execute the setting modes (a) to (d). 6) can be changed in various configurations, and these configurations are collectively referred to as mode specifying means (13), set value input means (14), and pressure comparison means (12A). , flow rate comparison means (12C), and operation designation means (12D).

Furthermore, the control flow for executing each mode (a) to (d) can be changed in various ways.

The type of transport fluid to be controlled by the flow rate control device according to the present invention is not limited.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a schematic longitudinal sectional view;
FIGS. 2(a) to 2(d) are diagrams showing the control flow of each mode, respectively. (1)... Valve body, (3), (6)...
・・Opening/closing operation unit, (1o)・・・・Suita sensor, (11)・・・・Secondary pressure sensor, (12)
...Controller, (12A) Old...Pressure comparison means, (12B) ...Calculation means, (12C)...
. . . Flow rate comparison means, (1217) . . . Operation designation means, (13) . . . Mode designation means, (14
)...Setting value input means, (a) to (d)...
...Mode, (PI), (P2)...Detection pressure, (ΔP)...Group/differential pressure, (P,)...Set pressure, (Ill)... ...Calculated flow rate, (Qs)...
...Setting flow rate.

Claims (1)

[Claims] A primary pressure sensor (10) that detects the pressure of the transport fluid on the upstream side of the valve body (1), and a secondary pressure sensor that detects the pressure of the transport fluid on the downstream side of the valve body (1). A controller (1) is provided with a pressure sensor (11) and automatically opens and closes the valve body (1) based on information from both of the sensors (10) and (11).
12), the flow rate control device comprising:
2) a mode specifying means (13) for selectively setting the following modes (a) to (d); (a) a detected pressure (P_2) of the secondary pressure sensor (11);
) is maintained within a set range, (b) the primary pressure and secondary pressure sensors (10), (
11) Flow rate (Q) calculated from the detected differential pressure (ΔP)
(c) The flow rate (Q) calculated from the detected differential pressure (ΔP) of the primary pressure and secondary pressure sensors (10) and (11) is set (Q_s
), the detection pressure of the secondary pressure sensor (11) (
P_2) within the set range, and its calculated flow rate (Q
) is equal to or higher than a setting (Q_s), a two-stage switching type pressure reduction mode in which the valve body (1) is fully opened; (d) the primary pressure and secondary pressure sensors (10);
11) Flow rate (Q) calculated from the detected differential pressure (ΔP)
is less than the setting (Q_s), the valve body (1) is kept fully open, and the calculated flow rate (Q) is the setting (Q_s).
An emergency shutoff mode that sets the valve body (1) to a fully closed state when the above occurs, and set value input means (14) for setting the flow rate (Q_s) and pressure (P_s) are provided, and the controller (12) , (a) Detection pressure (P_) of the secondary pressure sensor (11)
2) and the set pressure (P_s) of the set value input means (14).
), (b) the primary pressure and secondary pressure sensors (10), (
11) calculation means (12B) for calculating the flow rate (Q) based on the detected differential pressure (ΔP); (c) the flow rate (Q) calculated by the calculation means (12B) and the set value input means (14); a flow rate comparison means (12C) for comparing the flow rate with the set flow rate (Q_s); (d) the mode specifying means (13);
14), pressure comparison means (12A) and flow rate comparison means (1
Based on the information from 2C), an operation signal for executing the set one of the modes (a) to (d) is given to the opening/closing operation parts (3) and (6) of the valve body (1). A flow rate control device equipped with operation designation means (12D).