JPH0219696Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a volumetric flowmeter, and more particularly, to a volumetric flowmeter with excellent wear resistance, corrosion resistance, heat resistance, etc.

PRIOR ART Currently, various positive displacement flowmeters (hereinafter referred to as flowmeters) are used in the industrial world. Due to problems with the material of the chamber, there are very few flowmeters that can adequately handle this problem. In other words, for slurry-like liquids mentioned above, the metering chamber components wear out and have a short service life, and for highly corrosive liquids, flowmeters made of stainless steel, high nickel stainless steel, rubber lining, or plastic are used, depending on the corrosion mechanism. Different flowmeters are used, but they are insufficient in terms of corrosion resistance and swelling resistance, have a short lifespan, and for high-temperature liquids, the flow rate range is limited due to gaps in the metering chamber due to thermal expansion of the materials that make up the metering chamber. There were problems such as a narrower space and a shorter lifespan.

To solve these problems, it is possible to use ceramic materials, which have extremely excellent wear resistance, corrosion resistance, and heat resistance, as the material for constructing the metering chamber, but ceramic materials are difficult to process and cannot be used in flowmeters. It has the disadvantage of not being able to produce precision machined parts such as industrial parts, and being vulnerable to mechanical impact forces.
For this reason, flowmeters whose measuring chambers are made of ceramic material have not yet been manufactured.

Purpose The present invention was developed in view of the above-mentioned circumstances, and also because the applicant has put into practical use a precision processing method for ceramic materials and has made it possible to easily precisely process flowmeter parts. The purpose of this design is to provide a flowmeter that has excellent abrasion resistance, corrosion resistance, and heat resistance, and has a structure that prevents extreme forces from acting on the ceramic members that constitute the metering chamber. It is.

Configuration Fig. 1 is a side sectional view for explaining one embodiment of the flowmeter according to the present invention, and Fig. 2 is a - of Fig. 1.
The line sectional view and FIG. 3 are the - line sectional view of FIG. 1, FIG. 4, and a view seen from the - line direction of FIG. and a metering chamber main body having a metering chamber portion 1c; 2 is a metering chamber upper plate; 3 is a metering chamber lower plate; 4 and 5 are non-circular rotors (hereinafter referred to as rotors);
The rotors 4 and 5 are rotated by the fluid to be measured from a, and the number of rotations of the rotors is detected to measure the measuring chamber 1c.
It measures the flow rate passing through the tube. Specifically, the rotors 4 and 5 are rotated in the direction of the arrow by the fluid to be measured, and during one rotation of the rotor, a flow rate equivalent to four times the volume of the portion indicated by the diagonal line V in the figure is generated. For example, a permanent magnet 6 is embedded in the end face of one of the rotors, and this permanent magnet 6
is detected by a magnetic sensing element provided on the sensor 10 side, the number of revolutions of the rotor 4 or 5 is detected, and the flow rate is measured. Therefore, in a flowmeter manufactured using the above-mentioned conventional materials, the fluid to be measured is a photosensitive emulsion, paint, chemically processed wastewater, etc., or
If the fluid is a high temperature liquid, the surface of the member through which the measured fluid passes may be worn or corroded, or
Due to thermal expansion of each member, the gap between the contact surfaces of the rotors, the rotor and the metering chamber body, or the gap between the top or bottom surface of the rotor and the top plate of the metering chamber or the bottom plate of the metering chamber increases. As a result, the fluid to be measured leaks, increasing measurement errors, and the rotor bearing wears or corrodes, making it impossible to rotate. Naturally, ceramic materials, which are wear-resistant, corrosion-resistant, and heat-resistant, can be used to protect against such wear, corrosion, and thermal expansion, but ceramic materials are weak against mechanical impact forces. Therefore, it is necessary to construct the entire measuring instrument so that no external force is applied to these ceramic parts.

The present invention has been made in consideration of the above-mentioned points, and in the figure, 21 is an outer casing that houses the measuring chamber components made of ceramic material, and the lower assembly plate 14
are tightened with bolts 23. (Incidentally, the lower assembly plate 14 may be configured integrally with the bottom of the outer casing 21.) Inside this outer casing 21 are the lower cushion material 12, the leakage prevention plate 3a, the O-ring 3b, and the rotor shaft. Insert the measuring chamber lower plate 3, O-ring 1d, and measuring chamber main body 1 in order with fixing 4a and 5a,
Rotors 4 and 5 with magnets 6 embedded in the measuring chamber main body 1
are attached to the rotor shafts 4a and 5a, and then the O-ring 1d, the measuring chamber upper plate 2, and the upper cushion material 11 are assembled in this order into the upper part of the measuring chamber main body 1, and the upper assembly plate 13 is bolted. Tighten and assemble with 22.
A magnetic sensor 10 is attached to the upper assembly plate 13 to detect the magnet 6 and measure the rotational speed of the rotors 4 and 5.

With the above-mentioned configuration, the tightening force of the bolts 22 and 23 acting on the ceramic parts and other forces in the same direction as the tightening force can be buffered, and the ceramic parts can be protected from external forces such as impacts from directly acting on the ceramic parts. has been done. Furthermore, an inlet pipe 24 and an outlet pipe 25 of ceramic material are provided on both sides of the outer casing 21.
The bolt 3 is connected to the inflow side flange 30 and the outflow side flange 31 via the cushion members 28 and 29.
2, and communicates with the inflow passage 1a and the outflow passage 1b of the metering chamber main body 1 via O-rings 26, 27 and back-up springs 26a, 27a. With such a structure, the force acting on the inflow side flange 30 and the outflow side flange 31 can be buffered. In addition, the inflow pipe 2
4 and the outlet pipe 25 may be made of plastic or hard rubber depending on the properties of the liquid to be measured, and may also be lined with ceramic, plastic, or glass.

Furthermore, in order to use the above structure for high temperature applications, the measuring chamber main body 1 made of ceramic material, the measuring chamber upper plate 2, the measuring chamber lower plate 3, the outer casing and bolts 22, 23 of other metal materials, and the inflow of ceramic material are required. Pipe 2
4. Since the tightening force of the bolts 22, 23, 32 may be weakened due to the difference in linear expansion coefficient between the outflow pipe 25 and the bolt 32, the cushion materials 11, 12, 28,
It is also necessary that the material 29 has a larger coefficient of linear expansion than the bolts 22, 23, and 32. Furthermore, if the joint surfaces between the measuring chamber main body 1, the measuring chamber upper plate 2, and the measuring chamber lower plate 3, and the joint surfaces between the measuring chamber lower plate 3 and the leakage prevention plate 3a are mirror-finished, the ringing phenomenon of the joint surfaces can be prevented. The structure eliminates the need for O-rings 1d and 3b up to a certain pressure, allowing leak-free use. Furthermore,
By providing linear or spiral grooves on either the bearing surfaces of the rotors 4, 5 or the necessary parts of the rotor shafts 4a, 5a, lubrication by the metering fluid can be performed well and accuracy characteristics can be improved.

Effects As is clear from the above explanation, the present invention is a flowmeter that uses ceramic material and has excellent wear resistance, corrosion resistance, and heat resistance, and has a structure that completely protects the ceramic parts from external forces. This makes it ideal for industries where it has been difficult to measure slurry liquids, the chemical industry that has struggled with measuring highly corrosive liquids, and even high-temperature liquids alone or liquids that are highly corrosive due to their high temperatures. It is clear that this can make a significant contribution.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view for explaining one embodiment of a flowmeter according to the present invention, and FIG.
3 is a sectional view taken along the - line in FIG. 1, and FIG. 4 is a view taken from the - line direction in FIG. 1. 1...Measuring chamber plate, 2...Measuring chamber upper plate, 3...Measuring chamber lower plate, 4, 5...Rotor, 11, 12...Cushion material, 13, 14...Assembling plate, 21... ... Outer casing, 24, 25 ... Channel pipe, 26, 27 ... O-ring, 30, 31 ... Flange member.

Claims (1)

[Claims for Utility Model Registration] (1) A measuring chamber main body having an inflow channel and an outflow channel and having a measuring chamber section inside, a measuring chamber upper plate, a measuring chamber lower plate, and the measuring chamber main body. a pair of rotors disposed within the chamber, the fluid to be measured flows into the measuring chamber section from the inflow channel, rotates the pair of rotors, and discharges the fluid from the outflow channel; In the flowmeter that measures the flow rate of the fluid to be measured based on the rotational speed of the rotor during operation, the metering chamber main body, a metering chamber upper plate, a metering chamber lower plate, a leakage prevention plate, the pair of rotors and a rotor shaft. The outer casing is made of ceramic material, and the lower assembly plate is fastened to the leakage prevention plate, the measuring chamber lower plate, the measuring chamber main body incorporating the pair of rotors, the measuring chamber upper plate, and the upper cushion material in this order. The inner housing is fitted and installed through the lower cushion material, and is fastened with the upper assembly plate through the upper cushion material, and an inlet pipe and an outlet pipe made of ceramic material are installed on both sides of the outer casing. 1. A volumetric flowmeter, characterized in that the volumetric flow meter is provided with a side flange member and an outflow side flange member tightened together, and communicates with an inflow channel and an outflow channel of the metering chamber main body via packing. (2) The positive displacement flowmeter according to claim 1, wherein the cushion material is a material having a coefficient of linear expansion larger than that of the outer casing and the fastening bolt material. (3) The positive displacement flowmeter according to claim 1, wherein the inlet pipe and the outlet pipe are made of a hard rubber material or a plastic material. (4) The volumetric flow rate according to claim (1) of the utility model registration claim, characterized in that the liquid contact portions of the inlet pipe and the outlet pipe are provided with glass lining, plastic lining, or ceramic lining. Total.