JPS634976Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a non-circular gear type flowmeter.

A non-circular gear type flow meter, which is a type of positive displacement liquid flow meter, has a pair of non-circular gear-shaped rotors that mesh with each other in a measuring chamber with a cocoon-shaped cross section. The rotor is rotated by the rotor, and the flow rate is determined by detecting the rotation. However, this non-circular gear type flowmeter requires high precision in machining the main parts, especially the non-circular gears. The problem was that it required several processing techniques, making it difficult to mass produce and resulting in high production costs.

This invention was developed based on the above-mentioned viewpoints, and since the main parts can be processed using mass production methods such as press working and plastic molding, mass production is possible, production costs are low, and it can be used as a small flow meter. The purpose is to provide a suitable non-circular gear type flowmeter.

The gist of the present invention is to form a non-circular gear into a thin plate shape by punching with a press or plastic injection molding, to which one end of the rotor shaft is fixed, and to the other end of the rotor shaft. The rotor is constructed by providing a locking fitting attachment part, and a cocoon-shaped hole is provided in a plate-like body with approximately the same thickness as the non-circular gear to form a metering chamber plate, and a metering chamber plate that is the same as the metering chamber plate described above is formed. an outer casing plate made of a plate-shaped body having a thickness of , and having an inner circumferential surface spaced a certain distance outward from the outer circumferential surface of the measuring chamber plate, is stacked via a suitable gasket so as to surround the measuring chamber plate, The measuring chamber plate, outer casing plate, and gasket are stacked on a shaft holding plate having a pair of bearing holes concentric with the arc forming the cocoon shape, and the rotor shaft is rotatably inserted into the bearing hole. The above-mentioned pair of rotors are constructed so as to be rotatably engaged with each other inside the cocoon-shaped hole, and a locking fitting is attached to the locking fitting attachment part of the rotor shaft via a thrust plate to rotate the rotor shaft. a set of lids that freely lock these components and are equipped with channels that communicate with two cavities in the measuring chamber partitioned by the pair of rotors, and a detector that detects the rotation of the rotors; The flow meter is constructed by sandwiching the flowmeter between the flowmeter and the body via a suitable gasket, and assembling the flowmeter in an airtight manner using a suitable fastener.

The details of the configuration of the present invention will be explained below based on the drawings.

FIG. 1 is a front view showing an embodiment of a non-circular gear type flowmeter according to the present invention, and FIG.
A cross-sectional view along the line, Figure 3 is - in Figure 2.
It is a sectional view along a line.

In Figures 1, 2 and 3, 1 and 1' are non-circular gears, 2 and 2' are rotor shafts, 2a and 2a' are locking fitting mounting parts, 3 is a metering chamber plate, and 4 is a Outer casing board, 5,
5' is a thrust plate, 6, 6' are locking metal fittings, 7
8, 8' are shaft holding plates, 8, 8' are bearings, 9, 9' are gaskets, 10, 10' are knock pins, 11, 11' are lids, 12 is a fastener, 13 is an inlet, 13' is an outlet, 14 , 14' are magnets, and 15 is a detector for detecting the rotation of the rotor.

The non-circular gears 1, 1' are formed into thin plate shapes by punching out plate-shaped bodies by pressing or by injection molding of plastic, and are fixed to one end of the rotor shafts 2, 2', respectively.

The rotor shafts 2, 2' are rotatably supported by bearings 8, 8' attached to the bearing holes of the shaft holding plate 7, and the thrust plates 5 attached to the locking fitting attachment parts 2a, 2a'. , 5' and the locking fitting 6,
It is rotatably locked by 6'.

The non-circular gear 1 and the rotor shaft 2, and the non-circular gear 1' and the rotor shaft 2', each integrally constitute a pair of rotors, and rotate while always meshing with each other.

In the measuring chamber plate 3, a cocoon-shaped hole is formed in the center of a disc having approximately the same thickness as the non-circular gear 1, and is made up of two arcs along the outer periphery of the non-circular gears 1 and 1' when they rotate. A measuring chamber is formed by a space surrounded by the inner wall surface of the cocoon-shaped hole of the measuring chamber plate 3 and the opposing planes of the shaft holding plate 7 and the lid 11.

The outer casing plate 4 is formed by providing a hole having a diameter suitably larger than the outer periphery of the measuring chamber plate 3 in a plate-like body having the same thickness as the measuring chamber plate 3 .

The shaft holding plate 7 is provided with a pair of bearing holes concentric with the two arcs forming the cocoon-shaped hole of the measuring chamber plate 3, and bearings 8, 8' are attached to these holes.
The measuring chamber plate 3 and the shaft holding plate 7 are overlapped with a gasket 9 interposed therebetween, and the rotor shafts 2 and 2' are connected to the dowel pin 10 so that the rotor shafts 2 and 2' are concentric with the two arcs forming the cocoon-shaped hole in the measuring chamber plate 3. It is positioned so that

The lid body 11 is provided with flow passages that communicate with two cavities in the measuring chamber partitioned by a pair of rotors, one of which communicates with the inlet 13 and the other with the outlet 13'.

A suitable hole is provided in the lid body 11' at a portion corresponding to the locking metal fitting portion of the rotor shaft 2 so as to form a certain space between the lid body 11' and the locking metal fitting portion.

The measuring chamber plate 3, shaft holding plate 7, and rotor are sandwiched between lids 11 and 11' via gaskets 9 and 9', and further tightened with fasteners 12, so that they are integrally assembled in an airtight manner.

The magnets 14, 14' are provided at symmetrical positions with respect to the axis of the non-circular gear 1, and the detector 15 is provided on the lid 11 so as to face the magnets 14, 14' when the non-circular gear 1 rotates.

When fluid is introduced from the inlet 13, the non-circular gears 1 and 1' rotate in the direction of the arrow, and the non-circular gears 1 or 1', the metering chamber plate 3, and the shaft holding plate 7 are rotated in the direction of the arrow.
The fluid in the area surrounded by the lid 11 moves while being sealed and is discharged from the outlet 13'.

The detector 15 detects magnetic changes caused by the magnets 14, 14' attached to the non-circular gear 1, and the flow rate can be determined by knowing the rotational speed of the rotor.

Since the present invention is constructed as described above, according to the present invention, the main parts can be processed by mass production means such as press working, powder metallurgy, injection molding, etc., so mass production is possible, the production cost is low, and especially small flow rate A non-circular gear type flowmeter of a suitable style can be provided.

The configuration of the present invention is not limited to the above-mentioned embodiments, and the configuration of the non-circular gear, outer diameter, thickness,
The outside diameter, length, distance between shafts of the rotor shaft, shape and direction of the flow path, etc. can be freely changed within the scope of the purpose of the present invention, and the present invention encompasses all of them. It is something.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a non-circular gear type flowmeter according to the present invention, and FIG.
A cross-sectional view along the line, Figure 3 is - in Figure 2.
It is a sectional view along a line. 1, 1'... Non-circular gear, 2, 2'... Rotor shaft, 3... Measuring chamber plate, 4... Outer casing plate, 5... Thrust plate, 6, 6'... Locking metal fittings, 7...Shaft holding plate, 9,9'...Gasket, 11,11'...
... Lid body, 12 ... Fastener, 13 ... Inflow port, 1
3'... Outlet, 14, 14'... Magnet, 15...
A detector to detect the rotation of the rotor.

Claims (1)

[Claims for Utility Model Registration] A housing having a measuring chamber with a cocoon-shaped cross section and a pair of fluid passages communicating with the measuring chamber, and a housing that is supported by the housing constituent members so as to rotate while interlocking with each other in the measuring chamber, and is constantly In a non-circular gear type flowmeter consisting of a pair of non-circular gear-shaped rotors that divide the inside of a measuring chamber into two chambers, and a device that detects the rotation of the rotors, the non-circular gears are formed into a thin plate shape. This is fixed to one end of a rotor shaft opposite to the locking metal fitting part, which is provided with a locking metal fitting part at one end to form a rotor, and a casing for accommodating the rotor, a shaft holding plate having a pair of bearing holes that fit the rotor, into which the rotor shaft is rotatably inserted and locked by a predetermined locking fitting via a thrust plate; A shaft holding member is made of a plate-shaped body slightly thicker than the gear and has a cocoon-shaped hole forming a measuring chamber that fits the non-circular gear, and the shaft is held so that the non-circular gear is rotatably housed in the cocoon-shaped hole. The above-mentioned measuring device comprises a measuring chamber plate which is superimposed on a plate for positioning, and a plate-shaped body having the same thickness as the measuring chamber plate, and has an inner circumferential surface spaced a certain distance outward from the outer circumferential surface of the measuring chamber plate. A measuring chamber divided into two chambers by an outer casing plate superimposed on the shaft holding plate so as to surround the chamber plate, a gasket inserted between the measuring chamber plate and the outer casing plate, and the pair of non-circular gears. and a pair of lid bodies having flow passages communicating with each of the chambers, and an assembly consisting of the shaft holding plate, rotor, measuring chamber plate, outer casing plate, and gasket is held between the pair of lid bodies, and this The above non-circular gear type flowmeter is constructed by integrally assembling the above with appropriate fasteners.