JPS5939612Y2 - turbine meter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a turbine meter that detects slurry by converting it into an electrical signal.

Conventionally, as a method for detecting flow rate, in order to detect the rotation of an impeller that rotates in proportion to the flow rate, the impeller generates an induced voltage by changing the magnetic resistance of a magnetic circuit formed in a pickup coil attached to the meter body. Let's do it 5 [I'm doing it.

Therefore, the meter body housing the impeller must be made of a non-magnetic material so that changes in magnetic resistance can be transmitted through the meter body.

However, non-magnetic materials that are used industrially include austenitic stainless steel, bronze, and brass, but they are more expensive than magnetic materials such as carbon steel, so the cost of turbine meters is low. This is the reason for the increase in the price.

The present invention solves the above-mentioned problems, and its purpose is to keep the cost of the turbine meter low while ensuring pressure resistance against the fluid on the other side.

In order to achieve such an object, in the present invention, the turbine meter body through which the to-be-disposed fluid flows is formed into a substantially cylindrical shape made of magnetic metal, and the turbine meter body has a main body in which the flow velocity of the to-be-disposed fluid is adjusted. an impeller that rotates accordingly, a mounting member made of non-magnetic metal is integrally fixed at a position corresponding to the impeller on the turbine meter main body, and a recess is formed in the outer surface of the mounting member. A pickup mechanism having a pickup coil built in a case made of a non-magnetic material is held in the recess, and rotation of the impeller is detected by the pickup mechanism.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a meter body 1 is composed of a body part 2 having a circular cross section and flanges 3 and 4 attached to both ends of the body part 2. A boss 5b made of a non-magnetic material is provided in the flow path of the body part 2.
An impeller 5 having blades 5a made of magnetic material planted thereon is rotatably provided.

The impeller 5 is supported between bearings 8, 8 fixed between hollow pieces 6, 6 and a step 7.7 of the body 2.

9 is attached to the body 2 of the meter main body 1, and the impeller 50
This is a pickup mechanism that detects rotation.

The case of this pickup mechanism 9 is composed of a sleeve 10 made of a non-magnetic material and a flange 11 made of a non-magnetic material attached to the bottom of the sleeve 10.
The tip 13a of the core 13 made of a magnetic material wrapped around the core 13 protrudes l~.

A magnet 14 that magnetizes the core 13 is attached within the sleeve 10, and the magnet 14 and the core 13 form a magnetic circuit.

15 is an output terminal from the pickup coil 12.

In the body part 2, the part where the sleeve 10 is screwed is provided with a
A mounting member 16 made of non-magnetic metal is tightly fixed by welding.

A recess is formed in the mounting member 16, and when the base portion 10a of the sleeve 100 is screwed into the recess of the mounting member 16, the tip 13a of the core 13 and the blade Q5a of the impeller 5 face each other.

Note that the flange 3 of the meter body 1 excluding the mounting member 16
,4. The body 2 is made of an inexpensive material such as carbon steel as a magnetic metal.

Further, the size of the mounting member 16 is determined depending on the detection sensitivity.

In addition, although the mounting member 16 is fixed by welding, it may be integrated by casting, or it may be mounted with a seal ring interposed between the mounting member 16 and the body 2. to prevent fluid from leaking between the
It is sufficient to fix it so that it does not move due to the flow of fluid.

In this device, as shown in FIG. 3, when the impeller 5 is rotated by the fluid to be measured, the blades 5a of the impeller 5 approach and move away from the tip 13a of the core 13.

As a result, the magnetic resistance of the magnetic circuit changes, and an induced voltage is generated in the pickup coil 12.

In the embodiment, the magnet 14 is provided on the core 13 side, but as shown in FIG. 4, the magnet 14 may be provided on the impeller 5 side. In this case, the impeller is also made of a non-magnetic material. It is something that

Further, in the above embodiment, a so-called generator method is described in which the induced voltage is extracted as a flow rate signal, but a high frequency oscillation method in which a flow signal is extracted by modulating the high frequency from a high frequency oscillation circuit may also be used. In this case, the pickup coil is modulated. It is configured as a coil that detects changes in circuit inductance.

As described above, in this invention, the meter body corresponding to the pickup coil is made of non-magnetic metal in order to avoid inducing leakage magnetic flux in the meter body, so there is no need to make the entire meter body from expensive non-magnetic material. Not only can the price be reduced, but also the sensitivity can be improved since leakage magnetic flux is not induced in the meter body.

Furthermore, in the present invention, since the turbine meter main body has a substantially cylindrical shape, pressure resistance can be strengthened.In addition, both the turbine meter main body and the mounting member are made of metal, and the mounting member Since it is integrally fixed to the turbine meter main body, it is possible to obtain the same pressure resistance strength against the fluid on the other side as when the entire turbine meter main body is normally made of the same metal material.

In addition, since a recess is formed in the mounting member and the pickup mechanism is held in the recess, the impeller and the pickup mechanism are stably maintained in a distance relationship as close as possible, and the flow of the fluid on the side is maintained. Measurement accuracy can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of a turbine meter according to the present invention. FIG. 2 is a sectional view of a pickup mechanism that detects rotation of an impeller. 3 and 4 are diagrams showing the principle of operation of the pickup mechanism. DESCRIPTION OF SYMBOLS 1...Meter body, 2...Body part, 12...-Pickup coil 13...Core, 13a...Tip, 1
4...Magnet, 16...Mounting member.

Claims (1)

[Claims for Utility Model Registration] A turbine meter body in which a to-be-treated fluid flows is formed into a substantially cylindrical shape from magnetic metal, and an impeller that rotates in accordance with the flow velocity of the to-be-treated fluid is provided within the turbine meter body. a mounting member made of non-magnetic metal is integrally fixed at a position corresponding to the impeller in the turbine meter main body, a recess is formed on the outer surface of the mounting member, and a recess is formed in the recess. A pickup mechanism with a built-in pink-up coil is held in a case made of non-magnetic material,
A turbine meter characterized in that rotation of the impeller is detected by the pickup mechanism.