JPH06103199B2 - Open / close valve with flow meter - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-off valve in which an on-off valve that opens and closes a fluid passage is equipped with a flow meter that can measure the flow rate of fluid passing through the valve.

[Conventional technology]

A flow meter for measuring a flow rate and a valve for opening and closing the pipe are used when grasping the amount of the fluid sent through the pipe to control the supply amount or the discharge amount of the fluid. Conventionally, generally, for example, as shown in FIG. 5, a flowmeter 42 and a valve 43 are provided in a line 41 in series, and the valve 43 is controlled to be turned on or off based on the flow rate measured by the flowmeter 42. There is something that controls proportionally.
Further, more specifically, as shown in FIG. 6, when controlling the amount of steam supplied to the device 44 that consumes steam, a flow meter 45, an on / off or proportional control valve 46, and a pressure reducing valve 47. Are provided in series with the steam supply pipe 48. In the figure, 49 is a steam trap. In any case, the flow meter and the valve are formed separately.

Separately, a vortex flowmeter (or Karman vortex flowmeter) is known as one of the conventional outflow meters. The outline is that the flow velocity is calculated from the number of generated Karman vortices regularly generated on the downstream side of the object placed in the flow, and this is multiplied by the passage area (cross-sectional area) of the fluid to calculate the flow rate. It is a thing. Specifically, it is composed of a vortex generator installed in the pipeline, a sensor for detecting the vortex frequency, and a calculation and display unit.

[Problems to be Solved by the Invention]

Since the flowmeter and the valve are formed separately, it is necessary to sequentially connect the pipes, and the piping work becomes more troublesome as the number of instruments connected to the pipes increases, and the pipe becomes longer. Further, in the steam piping, it is necessary to shorten the piping in particular to prevent heat loss.

An object of the present invention is to integrally form a flow meter and a valve.

[Means for Solving the Problems]

According to the means of the present invention, the ball shaft of the ball butterfly valve is rotatably supported, and the valve shaft positioned in the flow across the valve hole of the ball valve body in the open state is defined as a vortex generator. The vibration generated by the vortex is detected by the vibration sensor provided on the valve shaft, and the valve passage flow rate is measured by the flow velocity calculated based on the detected vibration frequency and the opening area of the valve. It is characterized by

[Action]

According to the above means, since the valve shaft is used as the vortex generator, it is not necessary to separately provide the vortex generator, and the vortex frequency f generated by the existence of the valve shaft is detected by the vibration sensor provided on the valve shaft. After taking out, the flow rate Q can be calculated from the following equations (1) and (2).

Q = F · u (2) where St is the number of Strouhal in the pipe, u is the flow velocity of the fluid passing through the vortex generator, d is the vortex generator width (diameter in the case of a cylinder), and F is the fluid. The passing area.

〔Example〕

A first embodiment will be described with reference to FIG. Reference numeral 1 denotes a ball butterfly valve, which is composed of a main body 2 including two parts 2a and 2b, valve seats 3, 3, a valve body 4, a valve shaft 5, a handle 6 and the like. The valve body 4 is formed with a circular hole 10 as a fluid passage in a spherical body, and a valve shaft 5 penetrates at a right angle to the direction of the circular hole 10 so that the valve body 4
Has been stuck. The valve body 4 is supported by valve seats 3 and 3 provided in the main body 2 so as to rotate together with the valve shaft 5, and a handle 6 connected to the upper end of the valve shaft 5 is operated.
It rotates in the range of 90 degrees, and at its rotating position on one side, the circular hole 10 communicates with the inner holes 3a, 3a of the valve seats 3 and 3, respectively, and the direction of the circular hole 10 at the rotating position on the other side. Changes by 90 degrees and the inner holes 3a, 3a
The space is closed. In the figure, 11 is a washer, 12 is a disc spring, 13
Is an O-ring, 14 is a valve shaft holder screwed to the body portion 2a, 15 is a disc spring, 16 is a gasket, 17 is packing, and 18 is a seal. The above configuration is the same as that of the conventional ball butterfly valve, and the difference from the conventional configuration is that between the coupling portion of the handle 6 coupled to the upper end of the valve shaft 5 and the valve shaft holder 14, the portion of the main body. 1a and the valve shaft 5 are provided with a space portion 19 in an axially extended form, and a space portion 20 is also provided inside the valve shaft 5, and a piezoelectric element is installed as a vibration sensor 21 at the bottom of the space portion 20, The point is that the signal conductor 22 is drawn to the outside.
In the figure, 23 and 24 are conducting wire drawing holes, and 25 is a rubber bush.

The outer end of the conductor 22 is connected to the calculation / display unit 26. The calculation / display unit 26 is capable of performing the calculation according to the equations (1) and (2) and displaying the value of the flow rate Q obtained by the calculation.

In the first embodiment, when the handle 6 is operated from the valve closed state to the valve opened state, the fluid passes through the valve 11, and the fluid flowing from the upstream due to the presence of the valve shaft 5 at that time. Is accelerated in a contraction portion formed by the valve shaft 5 and the inner surface of the circular hole 10 to a flow velocity u, separated on both sides of the valve shaft 5 and entrained in a vortex, and vibrating downstream of the valve shaft 5. A wake occurs. This wake oscillates at the emission frequency f of the Karman vortex, attenuates by viscosity as it goes downstream, and returns to a steady flow. The vibration f is detected by the vibration sensor 21, and the calculation / display unit 26 calculates and displays the flow rate Q. If necessary, integrate the integrated flow rate so that it can be displayed.

A second embodiment will be described with reference to FIGS. 2 to 4. Second
In the figure, the same parts as those in FIG. 1 are designated by the same reference numerals and their explanations are omitted. The difference from FIG. 1 is that an electric actuator 30 is provided in place of the handle 6, and the conductor wire is correspondingly provided.
22 is the point where the drawing portion is formed and the point where the flow rate is integrated by using the computer 31 and the ball butterfly valve 1 is controlled according to the integrated flow rate.

Although detailed description of the structure of the electric actuator 30 is omitted, the electric actuator 30 is configured to open and close by rotating the valve shaft 5 one by 90 degrees in response to a signal from the computer 31. In order for the valve shaft 5 to rotate in a fixed direction, the conductor 22 is provided with a connector which is electrically connected and rotatable in the middle, as shown in FIG. The connector is connected to the conductor 22 connected to the vibration sensor 21 and fixed to the valve shaft 5, and the slider 32 is constantly in contact with the slider 32 and fixed to the inner peripheral surface of the space 19 and connected to the computer 31. And the metal ring 33 connected to the conducting wire 22. As a result, the vibration sensor 21 is always connected to the computer 31 even if the valve shaft 5 rotates.

The computer 31 obtains the flow rate Q calculated by the equations (1) and (2) and the integrated flow rate obtained by integrating the flow rate Q by the signal from the vibration sensor 21, and the integrated flow rate is set in advance. When the set value is reached, the valve closing signal is sent to the actuator 30.
The valve opening signal is output to the actuator 30 by the integrated time after valve closing, manual input, sequence control, or the like. The flow rate Q and integrated flow rate are displayed on the display
Displayed on 34.

The valve provided with the control unit 35 can be operated, for example, according to the flow chart shown in FIG. That is,
When the set flow rate is keyed in to the computer 31, the vortex signal from the vibration sensor 21 is received, the flow rate Q and the integrated flow rate are calculated and displayed on the display unit 34, and when the integrated flow rate exceeds the set value, it closes. A valve signal is output, and the actuator 30 rotates the valve shaft 5 to one side by 90 degrees to close the valve 1. After the valve is closed, the valve closed state is maintained until a valve open signal is input by any of the timer, manual, and sequence control units, and when the valve open signal is input, the valve open signal is output and the actuator 30 causes the valve shaft to move. 5 is rotated 90 degrees in the same direction as described above to return to the initial valve open state, and the same operation is repeated thereafter.

〔The invention's effect〕

Since the on-off valve equipped with the flow meter of the present invention uses the valve shaft originally provided in the ball and butterfly valve as the vortex generator, the function of the original valve can be completely achieved only by providing the vibration sensor on the valve shaft. The function of the flow meter can be added without impairing it. Therefore, since it is sufficient to provide only one on-off valve having a flow rate measuring function in the fluid conduit which has conventionally been provided with two separate devices, an on-off valve and a flow meter, the piping work becomes easier. Further, since the length of the pipe can be made short, it is advantageous in the case of steam pipe in terms of reducing heat loss.

Further, when the opening / closing drive unit of the opening / closing valve is an actuator that operates by an electric signal, the valve can be opened / closed so as to control the fluid supply amount by calculating the integrated flow rate using a computer. It is possible to obtain an automatic control device of fluid supply amount having various configurations.

[Brief description of drawings]

1 is a partial vertical sectional side view and a block diagram showing a first embodiment of the present invention, FIG. 2 is a partial vertical sectional side view and a block diagram showing a second embodiment of the present invention, and FIG. FIG. 4 is a partially enlarged perspective view, FIG. 4 is a flow chart of the control unit of the second embodiment, FIG. 5 is a piping diagram showing piping states of a conventional valve and a flow meter, and FIG.
FIG. 1 is a piping diagram showing an example of piping of a conventional steam supply device. 1 …… Ball butterfly valve, 2 …… Main body, 4 …… Valve element, 5 …… Valve shaft (vortex generator), 6 …… Handle, 21 ……
Vibration sensor, 22 ... Lead wire, 26 ... Calculation / display section, 30 ...
Actuator, 31 ... Computer.

Claims (1)

[Claims] 1. A ball-and-butterfly valve having a valve shaft as a vortex generator, and vibration caused by the vortex is detected by a vibration sensor provided on the valve shaft, and the flow velocity calculated based on the detected frequency and the valve. An on-off valve comprising a flow meter configured to measure the flow rate through the valve according to the opening area of the valve.