JPS6311818A - Vane-wheel type flowmeter - Google Patents

Abstract

PURPOSE:To achieve a simple construction and a smaller size along with a higher quality, by arranging a permanent magnet and a magnetic sensor in non-contact therebetween to prevent a liquid leak due to a poor seal. CONSTITUTION:This flowmeter is made up of a permanent magnet 40 arranged on a vane-wheel 4 to turn synchronously with it, a magnetic sensor 42 which is provided facing the magnet and generates a voltage pulse sensitive to changes in the magnetic field as caused with the rotation of the magnet 40 and the like. With the rotation of the magnet 40, a change in the magnetic field is caused in the magnet and when the change in the magnetic field is applied to an Fe-based amorphous metal wire 43, a voltage is induced in the metal wire 43. This voltage pulse is detected with the pulse detection coil 44 and transmitted to a flow display section 45 through a lead 46. The voltage pulse is subjected to waveform transformation through an amplifier and a comparator to be integrated with a counter and a flow rate within a diaphragm 32 is displayed digitally on a flow rate display section 45.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a blade wheel flow meter that determines the flow rate from the rotational speed of a blade wheel rotated by a fluid flow.

[Prior Art] Fig. 6 is an exploded perspective view of a blade wheel flow meter according to the conventional power generation system of the present applicant, which is shown in, for example, Japanese Patent Publication No. 3/3T9. This is a water meter, and water enters from the water inlet (ji) and exits to the water outlet (3). During this time, the water flow acts on the impeller [111], and the impeller (ul is the flow fk).
It rotates at a speed that corresponds to VC. (rl) The water meter (c) is a measuring board that rotates integrally with the impeller (vl).The 610 revolutions are transmitted through the reduction gear (ri1), and the dial is adjusted according to the amount of water used. fl
Displays the amount of water. (9) is a series of reduction gear trains for transmitting the rotation of the blade wheel shaft (61) to the mainspring winding shaft (to), and the rotation of the blade wheel shaft (6) is transmitted to the mainspring winding shaft (lo). and mainspring winding i1'Il] (10
) in the direction of the arrow.

(//) controls the rotation of the mainspring winding shaft (10).
/2), and intermittently rotates the output shaft (/3) following every constant rotation of the mainspring winding shaft (10). (/q) is an eccentric cam fixed to the spring winding shaft (10) VC, and a reciprocating lever (/q) is attached to the outer periphery of the eccentric cam (/q).
/j) is engaged, and therefore, in response to the rotation 6 of the mainspring winding shaft (10), the reciprocating lever (/S) rotates as the lever shaft (/6)
Performs reciprocating rocking motion using the fulcrum as the fulcrum.

(/2) is a holder (/7) whose one end is fixed to the spring winding shaft (10) and the other end is fixed to the output shaft (/3).
The mainspring is fixed to the end of the mainspring (/), and the mainspring (/) is wound up by rotation of the mainspring winding shaft (10) in the direction of the arrow. (/l) is fixed to the output shaft (/J)
This stopper (7g) engages with the stop lever (/9) fixed to the lever shaft (/c) together with the reciprocating lever (/s), and
The mainspring (/) is wound up by the rotation of the output shaft (/).
3) is designed to constantly stop the biasing rotation in the direction of the arrow. Then, the reciprocating lever (/j) swings back and forth by the eccentric cam (/su) by the rotation of the mainspring winding shaft (10), and the stop lever (/ri) also swings back and forth.

This swinging and reciprocating movement causes the retaining portion la of the stopper to
l is alternately disengaged from the retaining portion (bt') or (bco') of the stop lever (19), and when this engagement is disengaged, the mainspring winding shaft (10) is rotated. By energizing the mainspring (/), the output IQ (/, 7
) rotates rapidly in the direction of the arrow. That is, the output shaft (/3) of the mainspring shaft (10) intermittently and rapidly performs a follow-up rotation every half rotation of the mainspring winding @ (10).

(θ) is the rotor (2/) made of permanent magnets and the winding (
This is a generator consisting of a stator (23) with windings (2) and a stator (23). The rotor (2/) is fixed to the output shaft (/3), and is driven by the rotation of the output shaft (/J) to generate electric power in the winding C22).

(Cq) is a lead wire that transmits the generated power to the receiver (C5) Vc, and C10) is a stepping motor.
The rotor (2t) is composed of a commutative pole (29), and the stator (body) is alternately excited in opposite directions.
(g) rotates in one direction for //g rotation, and the transmission gear (3
The character wheel (3/) advances through 0).

Next, the operation of the conventional impeller flowmeter having the above configuration will be explained. Now, when water flows from the water inlet (C) to the water outlet (31), the impeller (R1) rotates at a speed corresponding to the amount of water.

The rotation of the impeller (vl) is controlled by a dial device (g
) is simultaneously transmitted to the mainspring winding shaft (10) of the accumulator (//), which rotates the mainspring winding shaft (10) in the direction of the arrow. Due to the rotation of the mainspring winding shaft (10), a rotational force acts on the output shaft (/3) via the mainspring (12), but the stopper (tt) and stop lever (19)
), the output shaft (/3) is prevented from rotating, and the mainspring (l) is wound by the rotation of the mainspring winding shaft (lθ).

On the other hand, the eccentric cam (
The reciprocating lever (/!;) and the stop lever (19') engaged with the mainspring winding shaft (10)
A reciprocating rocking motion is performed every half rotation as shown by the solid line arrow and the dotted line arrow. When the stop lever (/9) swings in the direction of the solid line arrow, it comes off the retaining part (al) of the stopper (/l) and the retaining part (bt) of the stop lever (7g), so the output shaft (/3) is the mainspring winding shaft (10) between them.
By half a rotation of the mainspring (/Y), it is energized by the wound mainspring (/Y) VC and rapidly rotates in the direction of the arrow in the figure. Then, until the engaging part (al of the stopper (7g)) butts against the retaining part (ba) of the stop lever (/d), that is, the output shaft (/3)
rotates half a turn and stops. At this time, the rotor (Y/) of the generator (KO) also rotates half a rotation, and the generator (20) receives AC power/
Mountain (positive or negative half cycle) to generate electricity.

Next, the mainspring winding shaft (io) rotates and the mainspring (/
When the stop lever (/9) swings in the direction of the dotted arrow, the retaining part (al) of the stopper (/9) comes off from the retaining part (ba) of the stop lever (/9). Similarly to the above, the output shaft (/3) is urged by the mainspring shaft (/2) and rotates.The retaining part (al) of the stopper (it) is the engaging part of the stop lever (/2). (bt'
Until it hits J, that is, the output shaft (/3) rotates half a turn and stops. At this time, the rotor (ko/) of the generator (yu θ)
It also rotates half a rotation, and generates an alternating current current in the opposite direction (negative or positive) to that described above.

In this way, the above-mentioned operation is repeated by the rotation of the mainspring winding shaft (10), and electric power is alternately generated in the opposite direction to the generator (co0) and transmitted to the receiver (coj). . In the receiver (coj), the stepping motor (sb) is alternately excited in the opposite direction by the electric power generated by the generator (JO), and the rotor (cog) rotates each time.
The character wheel (3/) advances to /step via the transmission gear (JO).

[Problem that the invention seeks to solve]

In the conventional impeller flowmeter configured as above,
The blade axle (6) passes through the bulkhead (32), and the blade axle (6) passes through the bulkhead (32).
Since it is necessary to provide a liquid-tight seal between 6) and the partition wall (4?) using, for example, a mechanical seal, there is a problem in that liquid leakage occurs due to abrasion at the contact surface. In addition, there are many mechanical connections in the drive path from the blade axle (6) to the letter wheel C3/), which complicates the structure of the flowmeter and increases its size, further leading to quality deterioration due to wear. There were also problems.

This invention was made to solve these problems, and provides a blade wheel flowmeter that prevents liquid leakage due to seal failure, has a simple structure, can be made smaller, and has improved quality. The purpose is to

[Means for solving problems]

The impeller flowmeter according to the present invention includes a impeller that rotates due to the flow of fluid, a permanent magnet that is interlocked with the impeller and rotates in synchronization with the impeller, and a permanent magnet that is provided facing the permanent magnet. The device is equipped with a magnetic sensor that generates voltage pulses in response to changes in the magnetic field generated by the rotation of a permanent magnet, and a flow rate display section that is electrically connected to the magnetic sensor and displays the flow rate using the voltage pulses. .

[For production]

In this invention, a permanent magnet rotates in synchronization with an impeller that rotates in accordance with the flow rate flowing within the partition wall, and the rotation of the permanent magnet induces a voltage pulse from the magnetic sensor.

This voltage pulse is transmitted to the flow rate display section via the lead wire, and the flow rate display section displays the flow rate inside the partition wall.

〔Example〕 Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention, and the same or corresponding parts as in FIG. 6 are designated by the same reference numerals, and the explanation thereof will be omitted.

In the figure, (DaO) is a permanent magnet that transmits the rotation of the blade axle (Al) that rotates integrally with the blade wheel (Da), and this permanent magnet (110') is made up of a plurality of hollow circular cylinders with the same center angle. The bodies (q/) are connected with different polarities facing each other, making the overall shape cylindrical. (Da2) is provided facing the permanent magnet (uO) and is generated by the rotation of the permanent magnet (uO). This is a magnetic sensor that generates a voltage pulse in response to the magnetic change in
A pulse detection coil (u
e) is wound. (tts) is the lead wire (su6)
The flow rate display unit (us) is connected to the magnetic sensor (tI2) via the amplifier, comparator,
The flow rate inside the bulkhead (as) is digitally displayed.

Next, the operation of the airfoil flowmeter having the above configuration will be explained.

Now, when water flows from the water inlet (λ) to the water outlet (3), the impeller Cda1 rotates at a speed corresponding to the flow rate. The rotation of the impeller (g+) causes the permanent magnet (qO) to rotate at a speed synchronized with the impeller (ul) via the impeller axle (6) and the reduction vehicle train +91.

The rotation of the permanent magnet (10) causes a magnetic field change in the permanent magnet (uO) as shown in Fig.
When applied to the e-based amorphous metal wire (Da 3), the Sth
The voltage pulse shown in the figure is applied to Fe-based amorphous metal wire (Da 3
) is induced. This voltage pulse is detected by the pulse detection coil (rtq) and transmitted to the flow rate display unit (us) via the lead wire (da 6).

This voltage pulse is converted into a waveform via an amplifier and a converter controller, integrated by a counter, and is then integrated into the flow rate display section (tS
), the flow rate inside the partition wall (32) is digitally displayed.

〔Effect of the invention〕

As explained above, according to the present invention, since the permanent magnet and the magnetic sensor are constructed in a non-contact state, the number of mechanical coupling parts is reduced, the structure is simplified, and troubles caused by mechanical wear can be avoided. decreases. In addition, impellers, permanent magnets,
The magnetic sensor etc. are arranged inside the bulkhead, and the configuration is such that information regarding the flow rate is transmitted to the R and quantity display section outside the bulkhead via lead wires, so it is necessary to seal between the bulkhead and the lead wires. This eliminates the risk of liquid leaking from the partition wall.

In addition, as in the above example, Fe-based amorphous metal wire (
If a magnetic sensor (q2) with a pulse detection coil (ttq) wound around q3) is used, it is possible to further downsize the airfoil flowmeter. In addition, since the permanent magnet (qO) is constituted by finely divided occluded cylindrical bodies (q/), a highly sensitive airfoil flowmeter can be obtained.

[Brief explanation of drawings]

1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view of the permanent magnet shown in FIG. 1, FIG. 3 is a transparent perspective view of the magnetic sensor shown in FIG. 1, and FIG. Figure S is a characteristic diagram showing the relationship between time and magnetic strength for the permanent magnet in Figure 1, Figure S is a characteristic diagram showing the relationship between time and voltage for the magnetic sensor in Figure 1, and Figure 6 is a characteristic diagram for the conventional airfoil flowmeter. It is an exploded perspective view showing an example. ((jls* impeller, (3)...bulkhead, (tag')...
・Permanent grinding stone, (11λ)・・Magnetic sensor, (rts)・
・Flow rate display section, (q6)...Lead wire. In each figure, the same reference numerals indicate the same or corresponding parts. Figure 1 on the right Figure 2 on the right Figure %3

Claims (3)

[Claims] (1) A blade wheel that rotates due to the flow of fluid; a permanent magnet that is interlocked with the blade wheel and rotates in synchronization with the blade wheel;
A magnetic sensor is provided facing the permanent magnet and generates voltage pulses in response to changes in the magnetic field generated by the rotation of the permanent magnet, and a flow rate display is electrically connected to the magnetic sensor and displays the flow rate using the voltage pulses. A blade wheel flow meter characterized by comprising: (2) The impeller flowmeter according to claim 1, wherein the permanent magnet has a plurality of hollow cylindrical bodies having equal central angles, which are coupled with opposite poles facing each other, and has a cylindrical overall shape. (3) The impeller flowmeter according to claim 1 or 2, wherein the magnetic sensor is formed by winding a coil around an Fe-based amorphous metal wire.