JPH0219698Y2 - - 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. There are very few flowmeters that can adequately handle the problem due to the material of the chamber structure.
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 of the present invention In view of the above-mentioned circumstances, the applicant has put into practical use a method for precision machining of ceramic materials, making it possible to easily precisely machining flowmeter parts. The purpose of this design is to provide a flowmeter with excellent wear resistance, corrosion resistance, and heat resistance, with a structure that prevents extreme forces from acting on the ceramic members that make up the chamber. .

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.
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. , and a measuring chamber main body having a measuring chamber part 1c, 2 is a measuring chamber upper plate, 3 is a measuring chamber lower plate, 4 and 5 are non-circular rotors (hereinafter referred to as rotors), and as is well known, an inflow flow path 1
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. In a flowmeter manufactured using the conventional materials mentioned above, when the fluid to be measured is a photosensitive emulsion, paint, chemically processed wastewater, etc., or a high-temperature liquid, it is necessary to Due to surface abrasion or corrosion, or thermal expansion of each member, gaps between the contact surfaces of the rotors, between the rotor and the measuring chamber body, or
The gap between the top or bottom surface of the rotor and the top or bottom plate of the metering chamber increases, causing fluid to be measured to leak and increasing measurement errors, or rotor bearings becoming worn or corroded and unable to rotate. There was a drawback. Naturally, to deal with such wear, corrosion, and thermal expansion, it is possible to use a ceramic material, for example, as a wear-resistant, corrosion-resistant, and thermal expansion-resistant material, but ceramic materials are resistant to mechanical impact forces. Therefore, it is necessary to construct the entire measuring instrument so that no external force is applied to these ceramic parts. This invention was made taking into account the above points,
In the figure, 11 is a cushion material disposed on the upper measuring chamber plate 2, 12 is the lower side of the lower measuring chamber plate 3, and in the case of the illustrated example, the liquid flows from the part where the rotor shafts 4a and 5a are supported. It has a cushion material 12 disposed below the leak prevention plate 3a to prevent leakage, and an upper cushion material 1.
An upper assembly plate 13 is placed above the bolt 1, and a lower assembly plate 14 is placed below the lower cushion material 12.
5, we are trying to tighten each other. Therefore,
Forces applied in the vertical direction to the metering chamber main body 1, the upper and lower plates 2 and 3 of the metering chamber, and the rotors 4 and 5 are effectively buffered by the cushion materials 11 and 12. Furthermore, both sides of the upper and lower assembly plates 13 and 14 are sandwiched by flange members 16 and 17,
Although it is tightened with bolts 18, the structure is such that the tightening force at that time is received by the upper and lower assembly plates 13 and 14 and is not applied to the ceramic member 12. Note that 19 is a screw hole for attaching a flange.

Furthermore, in order to use the above structure for high temperature applications, the fastening force of the bolts 15 must be increased due to the difference in linear expansion coefficient between the metering chamber body 1, the metering chamber upper plate 2, the metering chamber lower plate 3 made of ceramics and the bolts 15 made of metal. Therefore, the cushions 11 and 12 need to be made of a material with a larger coefficient of linear expansion than the bolt 15. 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. O-ring 1 up to a certain pressure
The structure eliminates the need for d and 3b, allowing leak-free use. Furthermore, by providing linear or spiral grooves on either the bearing surfaces of the rotors 4, 5 or necessary parts of the rotor shafts 4a, 5a, lubrication with the metering fluid can be performed well, and accuracy characteristics can be improved. .

Effects As is clear from the above explanation, the present invention provides a flowmeter that uses ceramic material and has a structure that has excellent wear resistance, corrosion resistance, and heat resistance, and that effectively protects 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 for measuring high-temperature liquids alone or liquids that are highly corrosive due to their high temperatures. It is clear that a significant contribution can be made.

[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 main body, 2...Measuring chamber upper plate, 3...
Measuring chamber lower plate, 4, 5... Rotor, 11, 12...
Cushion material, 13, 14... Assembly plate, 16, 1
7...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 flow meter that measures the flow rate of the fluid to be measured based on the rotational speed of the rotor, the measuring chamber main body, the measuring chamber upper plate, the measuring chamber lower plate, the pair of rotors, and the rotor shaft are made of ceramic material. In addition, an upper cushion material is provided on the upper plate of the measuring chamber, a lower cushion material is provided below the lower plate of the measuring chamber, an upper assembly plate is provided on the upper cushion material, and a lower cushion material is provided on the upper cushion material. A lower assembly plate is provided below the material, the upper assembly plate and the lower assembly plate are tightened together via the cushion material, and the upper assembly plate and the lower assembly plate are further tightened together. A volumetric flowmeter characterized in that both sides are sandwiched between flange members, and the flange members are tightened and fixed together. (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 fastening bolt material.