JPH0421075Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a flangeless positive displacement flowmeter, more specifically, a positive displacement flowmeter is inserted between a flange joint of a flow path pipe, and a bolt is inserted between the bolt holes of the flange joint. This invention relates to a small volumetric flowmeter that does not have a flange that is pressure-welded and interposed.

In general, a positive displacement flowmeter that has a rotor that responds to the fluid to be measured has a metering chamber that houses a rotor that introduces the fluid to be measured and performs a rotational movement proportional to the flow rate, and a measuring chamber that transmits the rotation of the rotor. , and a measurement display section that counts the transmitted rotation and displays it as a flow rate. A volumetric flowmeter configured in this way is installed in a flow pipe with a diameter that differs depending on the flow rate to be measured, so the volumetric flowmeter has a diameter that differs depending on the flow rate to be measured. A metering chamber is required, and the flow rate range is set in stages to create a series.

However, since it is necessary to correct the display unit of flow rate in the measurement display section, the basic mechanism is the same except for the unit correction point, so it is preferable to unify the shape and dimensions from the point of view of cost reduction. There are many.

Large volumetric flowmeters usually have a flange, and the flow pipe and the metering chamber of the flowmeter are connected to the flow pipe flange for the fluid to be measured. Similarly, providing a flange increases costs, so a flangeless positive displacement flowmeter is preferable to reduce costs.

When systematizing a series of small flangeless positive displacement flowmeters, if you use a unified measurement display even for small flowmeters, the same external dimensions of the measurement display will be different from the size of the measurement display for small flowmeters. It may be larger than the chamber. For this reason, the length of the metering chamber section in the flow direction, that is, the interval between the flange joints, must be made larger than the width of the metering display section. If a measuring chamber with a small diameter and long dimensions is pressed onto the flange joint of a flow pipe on the same line, strength problems such as buckling will occur, and furthermore, the strain acting on the measuring chamber will become large and the rotation of the rotor will be affected. influence
Because of these problems, it has been difficult to apply the flangeless method to small positive displacement flowmeters.

This idea was created in view of the problems mentioned above.
When a flow metering section consisting of a metering chamber and a metering display section is mounted between a flange joint by pressure contact, a positive displacement flowmeter is inserted between the flange joints so that the metering section is located outside the flange joint. This article relates to a flangeless positive displacement flowmeter.

FIG. 1 is a partial sectional view for explaining an embodiment of a flangeless positive displacement flowmeter according to the present invention.
A flangeless positive displacement flowmeter 100 is interposed between the flange joints 3 and 4 of the flow paths 1 and 2 through which the fluid to be measured flows, by means of these flange joints 3 and 4.
This flangeless positive displacement flowmeter 100 has parallel surfaces 13 and 1 that are pressed together between the flange joints 3 and 4.
4 and protrudes longer than the radius of the flange joints 3 and 4 in a direction perpendicular to the flow paths 1 and 2, a metering chamber section 20 and a metering display section 30.
A volumetric flowmeter 50 is removably attached to the ends of the flow path block 10 protruding from the flange joints 3 and 4; It has a filter 40 that filters the fluid to be measured flowing into the meter 50. The flow path block 10 also includes an inlet 11a coaxial with the flow paths 1 and 2 through which the fluid to be measured flows from the flow path, and an inlet 11a that communicates with the inlet 11a and is connected from the inlet 11a to the inlet 11a. an inflow passage 11b extending perpendicularly to the inflow passage 11a;
an inflow side channel 11 having a cavity 11c formed at the terminal end of b and for inserting the filter 40;
an outflow path 12a into which the fluid to be measured from the metering chamber 20 flows and extends substantially parallel to the inflow path 11b; and an outflow port 12b communicating with the outflow path 12a and coaxial with the flow paths 1 and 2. It consists of an outflow side flow path 12 having a.

As described above, the flangeless positive displacement flowmeter 100 of the present invention includes the flow path block 10 and the metering chamber section 20.
, a measurement display section 30 , and a filter 40 .

The flow path block 10 is inserted between the flange joints 3 and 4 by pressure contact with bolts 7 inserted into bolt holes (not shown) of the flange joints 3 and 4, and allows fluid to flow into the metering chamber 20. , which serves as a flow path for outflow, and the end surfaces interposed between the flanges 3 and 4 are parallel surfaces 13 and 14. The inflow side flow path 11 that introduces the liquid to be measured into the measurement chamber section 20 is a flow path from the flow path pipe 1 side to the measurement chamber section 20, and has an inlet (side flow path) 11a, an inflow path 11b, and an air flow path. Room 11c
This is a flow path that connects the two in order. The outflow channel 12 is
This is a flow path for the liquid to be measured flowing out from the measurement chamber 20 into the flow path pipe 2, and is in communication with the outflow path 12a and the outlet (side flow path) 12b, and is isolated from the inflow side flow path 11. It is. Here, the inlet 11a and the outlet 12
b is coaxial with the flow path pipes 1 and 2, and is the inflow path 11b.
The outflow passage 12a and the flow passage pipes 1 and 2 are perpendicular to the same direction and substantially parallel to each other. Therefore, the inflow path 11b and the outflow path 12a are the flange joint 3.
and 4, and its length is chosen to be longer than the radius of the flange joints 3 and 4.

The metering chamber section 20 is constructed integrally with the metering and counting section 30, and is arranged to be removably attached to the flow path block 10 by bolts 21. As a result, the empty chamber 11c of the inflow side flow path 11 is located on the inflow side (not shown) of the metering chamber section 20.
In addition, the outflow path 12a of the outflow side flow path 12 communicates with the outflow side (not shown). Here, the empty chamber 11c and the outflow side flow path 12 are separated by a cylindrical outflow side flow path derivation part 15 of the outflow path 12a, and a filter 40 is attached to the empty chamber 11c. .
This filter 40 is for removing dust that flows into the measuring chamber 20, and is plate-shaped.
can be easily attached and detached without being obstructed by the flange joints 3 and 4.

As is clear from the above description, the flangeless positive displacement flowmeter of the present invention has a flow path block 10,
The fluid to be measured is introduced to the outside of the flange joints 3 and 4 through the flow path block 10 and flows into and out of the metering chamber 20, so that piping stress is absorbed by the parallel flow path block 10 in contact with the flange joints 3 and 4. Since it acts only between the surfaces 13 and 14, buckling does not occur therebetween, and of course, unnecessary stress does not act on the measuring chamber 20, resulting in stable accuracy. Further, the volumetric flowmeter 50, which consists of the main parts of the metering chamber section 20 and the metering display section 30, can be easily attached and detached as is without having to be separated. Since the filter 40 can also be easily replaced by removing the volumetric flowmeter 50, the measurement accuracy will not be reduced by the attachment and detachment.

In addition, the measurement display section 30 is connected to the flange joints 3 and 4.
Since it is located outside of the flange joints 3 and 4, it is not affected by these flange joints 3 and 4, making it easy to read the measurement results.

Furthermore, since the flow path block is less expensive than the flange, an inexpensive positive displacement flowmeter can be provided.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view for explaining an embodiment of a flangeless positive displacement flowmeter according to the present invention. 1, 2...flow pipe, 3, 4...flange joint,
5, 6...Packing, 10...Flow path block, 1
1... Inflow side flow path, 12... Outflow side flow path, 20...
...Measuring chamber section, 30...Measuring display section, 40...Filter, 50...Positive flow meter, 100...Flangeless flowmeter.

Claims (1)

[Scope of claim for utility model registration] Between the flange joints of the flow path through which the fluid to be measured flows,
A flangeless positive displacement flowmeter that is press-fitted with these flange joints, the flangeless positive displacement flowmeter has a parallel surface that is pressed between the flanged joints, and the flange in a direction perpendicular to the flow path. a flow path block projecting longer than the radius of the joint; a volumetric flowmeter having a metering chamber and a metering display and detachably attached to an end of the flow path block projecting from the flange joint; a filter that is removably interposed in a flow path block and filters the fluid to be measured flowing into the volumetric flowmeter, and the flow path block is coaxial with the flow path and allows the fluid to be measured to flow from the flow path. an inflow port, an inflow path communicating with the inflow port and extending from the inflow port in a direction perpendicular to the inflow port; and an inflow path formed at the end of the inflow path for interposing the filter. an inflow channel having a vacant chamber; an outflow channel into which the fluid to be measured flows from the measurement chamber and extends substantially parallel to the inflow channel; and an outlet communicating with the outflow channel and coaxial with the flow channel. A flangeless positive displacement flowmeter comprising an outflow channel.