JPS59226779A - Flow rate detection and shutoff device - Google Patents

Abstract

PURPOSE:To improve the durability and reliability by detecting the rotational speed of a rotatable body rotating in a spiral flow so that the rotation may not be stopped due to foreign objects or water scale in the fluid. CONSTITUTION:Water feed is started when water flows in from an inlet 34. The water flow is caused to turn spirally in its axial flow by a stator blade 14. A magnetic ball 15 which is a rotatable body in said spiral flow rotates in a plane normal to the flow direction as it contacts a circumferential surface 24 of a valve body 18. Since the rotation of the magnetic ball 15 is proportionate to the flow rate, the flow rate can be measured by counting the rotational speed of the rotational ball 15. As the single valve body 18 has both capabilities of closing the flow passage and the rotating surface 24 for the magnetic ball 15, the number of component parts can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flow rate detection and shutoff device having the function of measuring the flow rate of a fluid and closing a flow path when a set flow rate has been reached.

Conventional Structure and its Problems Conventionally, this type of flow detection and cutoff device has been structured as shown in FIG. In FIG. 1, 1 is a main body, which has an inlet 2 and an outlet 3 for fluid.

Inside the main body 1, a valve seat 4 made of a rubber sheet and a resin ball 5 for closing the valve seat 4 are provided. A rotor blade 6 is provided downstream of the valve seat 4, and this rotor blade 60
The rotation is connected to a reduction gear 8 via a rotating shaft 7. At the final end of the reduction gear 8, a manual setting knob 9 with a supply flow rate setting scale is provided externally via a fluid leakage prevention sealing means (not shown). A cam portion 1o is configured inside the manual setting knob 9. child
One end of a shaft 11 for removing the resin ball 5 from the valve seat 4 is brought into contact with the cam portion 10, and the other end is in contact with the resin ball 6. A spring 12 urges the shaft 11 to the right in the figure.

In such a configuration, the valve 2 is generally connected to the bathtub faucet 3 and used. When the desired amount of water to be supplied to the bathtub (for example, 10 ol) is set using the manual setting knob 9, the cam portion 1o pushes the shaft 11 to the left in the figure as shown in FIG. 1, and the resin ball 5 is released from the valve seat 4. The state will be as follows. When water is supplied from the inlet 2 in this state, the rotor blades 6 located downstream of the valve seat 4 are rotated by the flow. The rotation of this rotary blade 6 is caused by the rotation axis 7. Rotate the manual setting knob 9 via the reduction gear 8. When the water supply amount reaches 1oool, the shaft 11 falls into the triangular groove of the cam 1o by the biasing force of the spring 12. As a result, the shaft 11 moves to the right in the figure, the resin pole 6 closes the valve seat 4, and the water supply stops. be done.

The disadvantage of this conventional example is that first of all, the rotating blade 6 is rotated and the manual setting knob 9 is rotated via the reduction gear 8. Foreign matter often gets caught between the gears 8 and 8, causing malfunction. In general, the rotor blade 6 has a rotation speed of about 200 rpm when water is supplied at 1 ol/min, and the rotational torque of the rotor blade 6 at this time is as small as a few g/cm, and there are few foreign substances. But if you bite, rotor blade 6
will stop. Second, the conventional system only has a function of stopping the water supply based on the cumulative amount of water supplied, and lacks a function of detecting the instantaneous flow rate. Thirdly, water hammer occurs when the water supply is completed and the resin pole 5 hits the valve seat 4 to stop the water supply. This is because the resin ball 5 suddenly closes the valve seat 4, which has the drawback of producing a large impact noise inside the piping and causing the flow rate detection/shutoff device and equipment to be damaged more quickly due to the impact.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional technology, and provides a flow rate detection system that does not have a bearing part and eliminates malfunctions caused by foreign objects or water stains in the fluid, and also reduces the water hammer effect when the water supply is stopped. The purpose is to provide a dual shutoff device.

Structure of the Invention In order to achieve this object, the present invention provides a swirling means for swirling a fluid in an axial flow, a rotating body that rotates in a plane perpendicular to the flow due to this swirling flow, and a rotation speed of this rotating body as shown in page 6. a detection means for detecting, a valve seat placed downstream of the rotating body and facing the flow, a valve body having a communication portion that communicates the upstream and downstream when the valve seat is closed; It consists of a driving means that separates from the valve seat,
With this configuration, the rotating body can be rotated without a bearing,
Furthermore, since the number of rotations is detected, reliability against foreign matter and water stains flowing in the fluid is increased, and since the flow path is closed through two operations, the water hammer effect can be reduced.

DESCRIPTION OF EMBODIMENTS Next, embodiments of the present invention will be described with reference to FIGS. 2 and 3. In FIGS. 1 and 2, 13 is a main body, and inside the main body 13 there are fixed blades 14, which are swirling means for axially swirling the fluid. A magnetic sphere 16, which is a rotating body that rotates in a plane perpendicular to the magnetic sphere, is provided. Further, a valve seat 16 is provided downstream of the magnetic sphere 16 to face the flow, and a rubber material is used for the sealing portion 17 of this valve seat 16. 67.-2°18 is provided. The valve body 18 is provided with a seat 2o, which is a contact surface between the communication hole 19 and the magnetic sphere 16.

The valve body 18 is connected by a drive shaft 23 to a plunger 22 of an electromagnet 21, which is a drive means provided outside the main body 13. A magnetic sphere 15 is located upstream of the valve body 18.
It constitutes a circumferential surface 24. The drive shaft 23 and the main body 13 are sealed from the outside by sealing means (not shown) such as rolling. 25 is a biasing spring that biases the plunger 22 to the right in the figure. Outside the main body 13, there is a flow rate detection section 28 composed of a magnetic resistance element 26 and a permanent magnet 27.
is provided. 29 is an operation panel, and on its surface there is a manual/automatic changeover switch 30, a valve open/close switch 31 that turns the electromagnet 21 on (ON) and t7 (OFF) during manual operation, and a supply amount setting knob 32. An on-off switch 33 is provided to start and stop flow rate detection when automatic. Also inside, there is an instantaneous flow rate detection device that calculates the instantaneous flow rate based on the signal from the flow rate detection section 28, an integrated flow rate detection device that calculates the integrated flow rate, an instantaneous flow rate setting device that sets the instantaneous flow rate, etc. (not shown). is provided. 34.35 indicates the inlet and outlet. Next, the operation in the above configuration will be explained. The flow rate detection and shutoff device is connected to the water supply circuit or hot water supply circuit. For example, when supplying 1 ool of water to a bathtub, switch the changeover switch 3o on the operation panel 29 to automatic, and set the supply amount setting knob 32 to 1oo71! When the ON-OFF switch 33 is turned ON, the plunger 22 is moved to the left side of the drive shaft 2 as shown in FIG.
The valve body 18 connected to the valve seat 16 is separated from the valve seat 16 and forms a flow path. In this state, water flows from the inlet 34 and water supply begins. The water flow is axially swirled by the fixed blades 14.

The magnetic sphere 16 placed in this axial swirling flow moves the valve body 1
It rotates in a plane perpendicular to the direction of flow while in contact with the circumferential surface 15 of No. 8. The magnetic sphere 16 may be composed of a resin ball plated with FeNi, a steel ball, a hollow steel ball, or the like. Since the rotation of the magnetic sphere 15 has a characteristic that it is proportional to the flow rate, the flow rate can be determined by measuring the number of rotations of the magnetic sphere 15. In this embodiment, the magnetic sphere 16 is configured to pass near a magnetoresistive element 26 to which a magnetic field is applied by a permanent magnet 27, and the magnetic field generated when the magnetic sphere 15 passes near the magnetoresistive element 26. A change in the resistance value of the resistance element 26 is electrically captured as a pulse. By processing this pulse signal using an instantaneous flow rate detection device or an integrated flow rate detection device, the instantaneous flow rate or integrated flow rate can be determined. The water supply amount approaches 1001,
When the value set with the supply amount setting knob 32 and the value calculated by the integrated flow rate detection device become equal, the electromagnet 22 turns off (
OFF), and the plunger 22 is moved to the right in the figure by the biasing spring 25 as shown in FIG. In this state, the valve body 18 contacts the seal portion 17 of the valve seat 16, and the flow path is closed. However, a slight flow occurs due to the communication hole 2o formed in the valve body 18. In such a small flow, the rotation of the magnetic sphere 16 is stopped. This slight flow causes the magnetic sphere 16 to move through the communication hole 2.
The water flows in the direction of 0 and finally comes into contact with the seat 2°9, completely closing the flow path and stopping the water supply. The contact force of the magnetic sphere 16 against the seat 20 is
This can be changed by increasing the contact area. After water supply is completed, switch the selector switch 30 to the manual side and switch the valve open/close switch 31 to the valve open side, and the electromagnet 2
1 is activated, and the plunger 22 is moved to the left in the figure as shown in FIG. At this time, the valve body 18 and the valve seat 16 are separated and a flow path is formed, so that there is no pressure difference before and after the valve body 18, and the magnetic sphere 1
5 performs a rotational motion in a state away from the seat 2o.

Manual use will be performed under such conditions. Furthermore, as described above, there is an instantaneous flow rate setting device inside the operation panel 29, and the setting value of the instantaneous flow rate setting device is set to, for example, 217=
By setting, it is also possible to function as a flow rate switch that starts and stops the heat source equipment etc. when the calculated value of the instantaneous flow rate detection device that calculates the instantaneous flow rate of the water supply amount reaches 2717 mvr.

As described above, in this embodiment, by providing the valve body 18 on the upstream side of the valve seat 16, when the valve body 18 comes into contact with the valve seat 16 and closes the flow path, 10, . -:/ Since pressure acts on the valve body 18, sealing performance can be improved. Moreover, since the rotating body is spherical, pressure loss can be reduced. Furthermore, one valve body 18 functions to close the flow path and function as the circumferential surface 24 of the magnetic sphere 15, reducing the number of parts.

Effects of the Invention As is clear from the above description, the flow rate detection and shutoff device of the present invention includes means for axially swirling fluid, a rotating body that rotates in this swirling flow, and detecting the rotational speed of this rotating body. a valve seat provided downstream of the rotating body; and a valve body having a communication portion that communicates with the downstream side when the valve seat is closed.
By configuring this driving means for the valve body, the following effects can be obtained.

0) Since there is no bearing on the rotating body that detects the flow rate, there is no rotation stoppage due to foreign matter or water scale in the fluid, and it is highly durable, reliable, and can provide stable performance over a long period of time.

(2) Detecting the flow rate by detecting the rotation speed of the rotating body 11
It has a page structure and has an instantaneous flow rate detection function.

(3) When the water supply is stopped, the valve body is first closed, and then the flow path of the communication part is closed by the rotating body, which can reduce the water hammer effect when the valve is closed, and the flow rate detection and shutoff device It will not have any negative effect on the product or equipment.

(4) Since the number of mechanically combined elements is significantly smaller than in the past, errors are reduced and high accuracy can be achieved.

(5) Remote control is possible from a remote location using electrical signal lines.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional flow rate detection and cutoff device, and FIGS. 2 and 3 are partial cross-sectional configuration diagrams of a flow rate detection and cutoff device that is an embodiment of the present invention. 14... Rotating means (fixed wing), 15...
・Rotating body (magnetic sphere), 16... Valve seat, 19.
...Communication portion (communication hole), 21...Driving means (electromagnet), 24... Circumferential surface, 28...
...Detection means (flow rate detection section). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Diagram 9) Dimension 9

Claims (2)

[Claims] (1) A swirling means for axially swirling the fluid to be detected flowing in a flow channel, a rotating body located in this swirling flow and rotating in a plane perpendicular to the flow direction, and a rotation speed of this rotating body. a detection means for detecting; a valve seat located downstream of the rotating body and facing the flow; a valve body that opens and closes the valve seat; and when the valve body is closed, the upstream and downstream of the valve body are communicated. A flow rate detection and shutoff device comprising a communication portion and a driving means for removing the valve body from the valve seat. (2) The flow rate detection and shutoff device according to claim 1, wherein the rotating body is a sphere, a valve body is provided upstream of the valve seat, and the circumferential surface of the sphere is formed on the valve body.