JPS6350592B2 - - Google Patents

Description

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

Conventional Structure and its Problems Conventionally, this type of flow rate detection and shutoff 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 rotary blade 6 is provided downstream of the valve seat 4, and the rotation of the rotary blade 6 is connected to a reduction gear 8 via a rotary 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 10 is configured inside the manual setting knob 9. The resin ball 5 is attached to the valve seat 4 on this cam portion 10.
One end of the shaft 11 is in contact with the shaft 11 to be removed from the resin ball 5, and the other end is in contact with the resin ball 5. 12
is a spring that urges the shaft 11 to the right in the figure.

In such a configuration, the inlet 2 is generally connected to a bathtub faucet. When the desired amount of water to be supplied to the bathtub (for example, 100) is set using the manual setting knob 9, the cam portion 10 pushes the shaft 11 to the left in the figure as shown in FIG. 1, and the resin ball 5 is separated 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 the rotary blade 6 rotates a manual setting knob 9 via a rotary shaft 7 and a reduction gear 8. When the amount of water supplied reaches 100, the shaft 11 falls into the triangular groove of the cam 10 due to the biasing force of the spring 12. As a result, the shaft 11 moves to the right in the figure, the resin ball 5 closes the valve seat 4, and water supply is stopped.

A disadvantage of this conventional example is that the rotating blade 6 is rotated and the manual setting knob 9 is rotated via the reduction gear 8, so the bearing part of the rotating shaft 7 and the gears of the reduction gear 8 provided in multiple stages are Foreign objects often get caught in the machine, causing malfunction. In general, rotor blade 6
When water is supplied at 10/min, the rotation speed is approximately 2000 rpm, and the rotational torque of the rotor 6 at this time is several g/cm.
The rotor blade 6 was so small that if even the slightest bit of foreign matter bit into it, the rotor blade 6 would stop.

OBJECTS OF THE INVENTION It is an object of the present invention to overcome the drawbacks of the prior art and provide a highly reliable flow rate detection and shutoff device against foreign matter and limescale in the fluid.

Composition of the Invention In order to achieve this object, the present invention includes a fixed-wing rotating means for axially swirling the detected fluid flowing in a flow channel, and a fixed-wing rotating means located downstream of the rotating means, a swirling chamber having a spherical rotating body that rotates by the axial swirl; a valve seat located downstream of the swirling chamber and against which the rotating body comes into contact when stopping the flow of the fluid to be detected; The rotating body includes a detecting means provided outside the chamber and detecting the number of rotations of the rotating body, and a driving means operated by a signal from the detecting means to bring the rotating body into contact with the valve seat. When the rotating body leaves the valve seat upstream, it comes into contact with the inner wall of the swirling chamber and the driving means, and rotates in the flow of the fluid to be detected. The rotor rotates without bearings, eliminating the drawbacks of the conventional system.

DESCRIPTION OF EMBODIMENTS Next, embodiments of the present invention will be described based on 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, and fixed wings 14 which are placed downstream of the fixed wings 14 and which are placed downstream of the fixed wings 14 and are arranged to rotate the fluid by the axial swirling. A magnetic sphere 15 that is a rotating body orbiting in the fluid to be detected
is provided. Further, a valve seat 16 is provided downstream of the magnetic sphere 15 to face the flow, and a sealing portion 17 of this valve seat 16 is made of a rubber material. The diameter of the inner flow path 18 of the valve seat 16 is designed to be smaller than the diameter of the magnetic sphere 15. Further, a drive shaft 21 is provided downstream of the fixed blade 14 as a drive means connected to a plunger 20 of an electromagnet 19 provided outside the main body 13. Note that the tip end 22 of the drive shaft 21 is a magnetic sphere 10.
It has 5 circumferential surfaces. Drive shaft 21 and main body 13
is sealed from the outside by a sealing means (not shown) such as an O-ring. 23 is a biasing spring that biases the plunger 20 to the right in the figure. A magnetic resistance element 24 and a permanent magnet 25 are provided on the outside of the main body 13.
A flow rate detection section 26 is provided.
27 is an operation panel, on the surface of which there are a manual and automatic changeover switch 28, a valve open/close switch 29 that turns the electromagnet 19 on (ON) and off (OFF) during manual operation, a supply amount setting knob 30, and an automatic switch. An on (ON)-off (OFF) switch 31 is provided to start and stop flow rate detection when the flow rate is detected. Also provided inside is an integrated flow rate detection device (not shown) that integrates the flow rate based on the signal from the flow rate detection section 26. 32 and 33 indicate an inlet and an outlet, 34 is a swirling chamber in which the magnetic sphere 15 rotates, and 35 is an inner wall of the swirling chamber 34.

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 100 liters of water to a bathtub, switch the changeover switch 28 on the operation panel 27 to automatic,
Set supply amount setting knob 30 to 100 and turn ON-
When the OFF switch 31 is turned on, the plunger 2
0 is moved to the left side in the figure as shown in Figure 2, and the drive shaft 2
The magnetic sphere 15 is now able to orbit around the tip 22 of the magnetic sphere 1. In this state, water flows from the inlet 32 and water supply starts. The water flow is axially swirled by the fixed blades 14. The magnetic sphere 15 placed in this axial swirling flow contacts two points, the tip 22 of the drive shaft 21 and the inner wall 35 which is the inner surface of the swirling chamber 34, and rotates in this flow due to the swirling flow. . The magnetic sphere 15 may be made 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 15 passes near the magnetoresistive element 24 to which a magnetic field is applied by the permanent magnet 25, and the magnetic field generated when the magnetic sphere 15 passes near the magnetoresistive element 24. A change in the resistance value of the resistance element 24 is electrically captured as a pulse. The cumulative flow rate can be determined by processing this pulse signal using the cumulative flow rate detection device. Water supply amount
When the value approaches 100 and the value set with the supply amount setting knob 30 becomes equal to the value calculated by the integrated flow rate detection device, the electromagnet 19 is turned off and the plunger 2
0 is moved to the right in the figure by the biasing spring 23 as shown in FIG. As a result, the drive shaft 21
The tip portion 22 of is moved downstream from the position of the valve seat 16. Therefore, the magnetic sphere 15 comes into contact with the seal portion 17 to close the inner flow path 18 and stop the water supply.
After the water supply is completed, switch the changeover switch 28 to the manual side and switch the valve open/close switch 29 to the valve open side.
The electromagnet 19 is activated and the plunger 2 is activated as shown in FIG.
0 moves to the left in the figure, magnetic sphere 15 and valve seat 16
It can be used as an on-off valve by separating it.
Note that the detection means may use light instead of magnetism.

Effects of the Invention As is clear from the above description, the flow rate detection and cutoff device of the present invention includes a fixed blade swirling means for axially swirling the fluid to be detected flowing in a flow channel, and a fixed-wing swirling means located downstream of the swirling means. a swirling chamber including a spherical rotating body that rotates in the flow of the detected fluid by the axial swirl; A valve seat in contact with the valve seat, a detection means provided outside the swirling chamber for detecting the rotational speed of the rotating body, and a driving means that is operated by a signal from the detection means and brings the rotating body into contact with the valve seat. When the rotating body is separated from the valve seat to the upstream side, the rotating body
By arranging the rotating chamber to be in contact with the inner wall of the swirling chamber and the driving means and circulating in the flow of the detected fluid, the following effects can be obtained.

(1) The rotating body that detects the flow rate is spherical and does not have bearings like rotary blades, so it does not stop rotating due to foreign objects or water stains in the fluid, and has high durability, reliability, and stable performance over a long period of time. can be obtained.

(2) There are far fewer mechanical combination elements than in the past, leading to fewer errors and better accuracy.

(3) Remote control is possible from a distance using electrical signal lines.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional flow rate detection and shutoff device.
FIGS. 2 and 3 are cross-sectional views showing an embodiment of the flow rate detection and shutoff device of the present invention. 14...Swivel means (fixed wing), 15...Rotating body (magnetic sphere), 16...Valve seat, 19...Electromagnet, 2
0...Plunger, 21...Drive shaft, 24...Magnetic resistance element, 25...Permanent magnet, 26...Detection means (flow rate detection unit).

Claims (1)

[Claims] 1. A fixed blade rotating means for axially swirling the fluid to be detected flowing in the flow channel, and a spherical rotating body located downstream of the swirling means and rotating in the flow of the fluid to be detected by the axial swirling. a swirling chamber, a valve seat located downstream of the swirling chamber and against which the rotating body comes into contact when stopping the flow of the fluid to be detected; and a driving means that is operated by a signal from the detection means to bring the rotating body into contact with the valve seat, and the rotating body is configured to detect when the rotating body is disengaged upstream from the valve seat. The flow rate detection and cutoff device is configured to abut on an inner wall of the swirling chamber and the drive means and circulate in the flow of the detected fluid.