JPH0949747A - Counter-mounting structure for positive displacement flowmeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a counter having a body including a flow oscillating element and a detector by a one-touch operation. SOLUTION: A flowmeter body 30 having a channel 33 and rotors 35, 36 embedded at least at either one with a flow oscillating element is mounted at the bottom of a housing 20, and a counter 1 is contained in the housing 20. The counter 1 has a flow detector 6 at the bottom center, a battery and a flow calculator therein and a flow display unit and an F/I converter 5 on the surface, and a concentric collar 3 at a cylinder integrally molded with them. The counter 1 is mounted at the housing 20 by the collar 3, covered with a cover 10 thereon, and rotated while bringing into pressure contact with it. A plurality of inner protrusions 14 are provided at the cover 10, and the outer protrusions 24 of the same number as that of the protrusions 14 are provided at the housing 20, and the cover 10 is so rotated that a sealing hole 13a is brought into coincidence with a sealing hole 23 to engage the protrusions 24 with the protrusions 14 to be sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a counter of a volumetric flow meter, and more particularly to a volumetric flow meter and a counter having a sealed structure for detecting and calculating the rotation of the volumetric flow meter and displaying the flow rate. The present invention relates to a counter portion mounting structure of a volumetric flow meter that enables joining of one and one touch.

[0002]

2. Description of the Related Art As is well known, a volumetric flowmeter has a rotor that rotates in a measuring chamber, and the volumetric flow rate is obtained from the rotation of the rotor that rotates in proportion to the volume of fluid flowing into the measuring chamber. It is a meter and has the characteristic that it is hardly affected by the flow change due to the shape of the pipe to which the flow meter is attached. In particular, volumetric flowmeters that have a pair of non-circular gears that rotate in mesh are small in friction torque required for meshing gears and friction loss of bearing torque, and non-circular gears rotate even with a small pressure difference, and even up to a small flow rate. Since it can be used on the flow meter side, it is used for a liquid fuel such as petroleum that has been passed a prescribed inspection after passing a predetermined inspection.

In a positive displacement flowmeter having a non-circular gear, a main body in which a rotor in which a transmitting element such as a magnet is embedded in one or both of a pair of non-circular gear rotors that mesh with each other is rotatably housed in a measuring chamber. And a counter for detecting the rotation of the rotor, which rotates according to the flow of fluid, through the transmitting element to perform the flow rate calculation and display the flow rate and / or remotely transmit the flow rate signal. The ones are often used.

[0004]

As described above, the volumetric flowmeter for transaction constructed as described above is integrally formed by joining the main body section and the counting section with bolts or the like, and is sealed. For a positive displacement flowmeter that measures a kerosene flow rate with a small range, for example, a maximum flow rate of 10 (l / h: liter / hour), it is required to have a long service life without battery replacement after sealing. Also, in the conventional method in which these small volumetric flowmeters are configured separately from the main body section and the counting section and joined by bolts, etc., the shape becomes large and the cost increases, and counting is also performed according to the usage environment. There was a problem that the seal had to be removed and the position adjusted in order to determine the posture so that the display could be easily seen.

In order to solve the above-mentioned problems, the present invention allows the main body and the counter to be joined with one touch without using screws or bolts, and moreover, the flow rate can be freely changed without removing the seal. It is an object of the present invention to provide a counter part mounting structure for a volumetric flow meter in which the attitude of the counter part can be changed so that the display part can be viewed easily.

[0006]

The invention according to claim 1 is: a positive displacement flowmeter main body having a pair of non-circular gears, which meshes and rotates in a measuring chamber, and has a transmitting element embedded in one end face thereof; and a battery. A cylindrical counting unit having a sealed structure for detecting the movement of the transmitting element to perform flow rate calculation and remotely displaying a flow rate display and / or a flow rate signal, and a bottomed upper opening for accommodating the counting unit. In the cylindrical body, the volumetric flowmeter is mounted on the outer surface of the bottom, and a housing provided with a plurality of outer locking projections protruding outward on the inner circumference near the opening end, and the outer surface of the housing. In cooperation with the locking projections, a plurality of evenly-spaced protrusions projecting inward are pressed in order to press the outer peripheral surfaces of the upper and lower end surfaces of the counting unit so that the flow rate display of the counting unit stored in the housing can be visually observed. It is composed of a ring-shaped lid body provided with an inner locking protrusion, and the lid body is rotated in the circumferential direction. Side, engages the inner locking projection, by attaching the counter to the volumetric flowmeter body,
The object is to provide a small and inexpensive positive displacement flow meter for transactions.

The invention according to claim 2 is: in the invention according to claim 1, the material of the casing is a metal, and the material of the lid is a resin material having a rigidity lower than that of the metal material,
When the counting unit is housed in the housing and pressed by the lid, the counting unit can be rotated around an axis against the spring action of the lid, without removing the seal, Determine the position of the flow rate display that is easiest to read without being affected by the mounting posture.

According to a third aspect of the present invention, in the first aspect of the present invention, when the detecting element of the counting section for detecting the movement of the transmitting element is projected on the end face of the non-circular gear, the projected position Is on the circle of the rotation locus of the transmitting element, so that the counter can be rotated in the circumferential direction and accurate flow rate measurement can be performed without erroneous transmission regardless of the position of the counter.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In order to explain the structure for mounting the counting portion of a volumetric flow meter according to the present invention, first, each element constituting the volumetric flow meter will be described. The components are a counting unit, a lid,
It consists of a housing and a flow meter body. These components will be described below. 1A and 1B are a counter portion for explaining an example of an embodiment of a counter portion mounting structure for a volumetric flow meter according to the present invention, FIG. 1A is a plan view, and FIG. 1B is a side view. In the figure, 1 is a counting unit, 2 is a molded body, 3
Is a collar portion, 4 is a flow rate display portion, 5 is F / I (frequency / current)
The converter 6 is a flow rate detector.

The counting unit 1 integrates the flow rate detecting unit 6, a flow rate calculating unit (not shown) for calculating the flow rate signal detected by the flow rate detecting unit 6, and the calculated flow rate signal, for example. A flow rate display unit 4 for displaying a liquid crystal as a flow rate, an F / I converter 5, and a battery (not shown) for driving these electric circuits are built in, and integrally molded into a cylindrical shape to form a molded body 2. . The battery life of the molded counting unit 1 is 7 years or more, and the life of the counting unit 1 is reached until the battery needs to be replaced. The flow rate detection unit 6 is embedded near the bottom surface 2a of the central axis ZZ of the cylindrical molded body 2. The mold body 2 is provided with a flange portion 3 protruding on the outer peripheral side, and the lower surface of the flange portion 3 is placed on a housing described later.
The F / I conversion unit 5 is also a portion that serves as a gripping unit that rotates the counting unit 1, and projects above the flow rate display unit 4.

FIG. 2 is a view for explaining a lid portion for accommodating the counting portion shown in FIG. 1, FIG. 2 (A) is a plan view, and FIG.
2B is a sectional view taken along the line BB of FIG. 2A, in which 10 is a lid, 11 is a ring-shaped body, 12 is an opening, and 1 is
3 is a sealing collar, 14 is a locking projection, and 15 is an insertion surface.

The lid 10 allows the flow rate display of the flow rate display section 4 of the counting section 1 to be visually observed, and has a circular opening 12 for projecting the F / I conversion section 5 above the flow rate display section 4. A ring-shaped body 11 having an L-shaped cross section provided with a sealing collar 13 having a sealing hole 13a at one side end, and an inner diameter large enough to insert the collar 3 of the counting unit 1 at the lower end surface of the opening 12. An insertion surface 15 is provided. The insertion surface 15 is provided with a plurality of (4 in FIG. 2) inner locking protrusions 14 protruding inward at equal intervals.

FIG. 3 is a diagram for explaining a housing that houses the counting unit shown in FIG. 1 and is equipped with a flowmeter main body.
3A is a plan view and FIG. 3B is a view BB in FIG. 3A.
In a line sectional view, in the figure, 20 is a housing, 21 is a cylindrical body, 22 is an upper opening, 23 is a sealing flange, 24 is an outer locking projection, and 25 is an insertion surface.

The housing 20 is a bottomed cylindrical body 21 having a bottom portion 21a and an upper opening 22 and having a substantially constant inner diameter. The outer peripheral surface near the upper opening 22 is an insertion surface 25. On the insertion surface 25, outer locking projections 24 that lock the counting unit 1 in cooperation with the inner locking projections 14 are provided at equal intervals in the same number as the inner projections 14. Further, a sealing collar 23 having a sealing hole 23a for sealing in cooperation with the sealing collar 13 is provided outside the vicinity of the upper end. Further, a flow meter body described below is attached to the outer bottom surface 21b.

FIG. 4 is a flow meter main body corresponding to the counting section of FIG. 1, FIG. 4 (A) is a plan view, and FIG. 4 (B) is a sectional view taken along the line BB of FIG. 4 (A). Yes, in the figure, 30 is the flowmeter main body,
31 is a main body, 32 is a measuring chamber, 33 is a flow path, 34 is an O-ring groove, 35 and 36 are non-circular gear rotors, 37 is a fixed shaft,
38 and 39 are magnets.

In FIG. 4, the flowmeter main body 30 is a main body 3
1 and a pair of non-circular gear rotors (hereinafter, referred to as rotors) 35 and 36 that rotate in mesh with each other. The main body 31
Concave with a pair of circular walls and fixed shafts 37, 3 at the center of the circle
It has a measuring chamber 32 to which 7 is attached, a flow path 33 communicating with the measuring chamber 32 and penetrating the main body 31, and an O-ring groove 34 provided on the outer peripheral surface of the counting chamber 32. A pair of fixed shafts 3
In FIG. 7, rotors 35 and 36 are rotatably meshed and axially supported, and one rotor, for example, magnets 38 and 39 that serve as transmitting elements in an axially symmetrical manner are embedded on the major axis of the rotor 35. ing. Next, a mounting structure of the counting unit 1 with respect to the flowmeter main body 30 will be described.

FIG. 5 is a partial side sectional view for explaining an example of an embodiment of a counter flow part mounting structure for a volumetric flow meter according to the present invention. In FIG. 5 and FIG. 6 shown below, FIG.
Parts having the same functions as those in FIGS. 1 to 4 are designated by the same reference numerals as in FIGS. 1 to 4.

First, the housing 2 to which the flowmeter main body 30 is attached
The collar part 3 of the counting part 1 is placed in the inside of the outer peripheral end face 21c of the housing 20.
The counting unit 1 is placed on the top and stored. At this time, the height H ₁ from the lower surface of the flange portion 3 to the bottom surface 2a is slightly larger than the depth H ₂ from the outer peripheral end surface 21c of the housing 20 to the bottom portion 21a (H ₁ ≧ H ₂ ). Next, the lid 10 is covered on the counting unit 1 placed on the housing 20 so that the insertion surface 25 and the insertion surface 15 are fitted to each other. The collar 3 of the counting unit 1 and the housing 2
You may make it fit by interposing an elastic body such as an O-ring between the outer peripheral end surface 21c of 0. At this time, the inner locking projections 14 of the lid 10 and the outer locking projections 24 of the housing 20 are out of phase in the circumferential direction. After that, the lid 10 is rotated in the circumferential direction so that the counting unit 1 is pressed into the housing 20, and the inner locking protrusion 14 is brought into pressure contact with the outer locking protrusion 24 to attach the counting unit 1 to the housing 20. . Seal tsuba 13 at this time
And the position of the sealing collar 23 are aligned so that the sealing hole 13a
And 23a are sealed (corresponding to claim 1).

By the above operation, the counting unit 1 is pressed into contact between the lid unit 10 and the housing 20, but when each is made of metal, the rigidity is high and the counting unit 1 is substantially fixed, and therefore the flow rate display unit. The position of 4 is also determined. However, the mounting posture of the flow meter differs depending on the piping conditions, and the piping conditions differ depending on the operating environment, so the flow rate display on the flow rate display unit 4 may be difficult to see.

To eliminate this problem, the counting unit 1
It is required that the counting unit 1 can be rotated even when the casing 20 and the lid 10 are pressed against each other. For this reason, the lid 10 is made of a resin material having a rigidity less than that of the metal material of the housing 20, and the lid 10 is used as one spring material so that the counter 1 can be rotated in the circumferential direction. 2).

When the counting unit 1 is rotated, the flow rate detecting unit 6 provided near the bottom surface 2a of the counting unit 1 must be able to detect the rotation of the magnets 38 and 39 of the transmitting element of the rotor 35 without error. . The arrangement for this will be described with reference to FIG.

FIG. 6 is a view for explaining an embodiment of a mounting structure of the volumetric flow meter according to the present invention to a housing. As described above, the flow rate detection unit 6 incorporated in the counting unit 1 is provided on the ZZ axis of the cylindrical molded body 2. The outer circumference of the collar 3 is a circumference around the Z-Z axis, and the collar 3 is the outer casing 2
Since it is placed concentrically with the outer peripheral end face 21c of No. 0 and pressed against it, the flow rate detection unit 6 is located at the center of the outer side face 21 of the outer casing 20, X-.
It is on the intersection 0 of the X axis and the Y-Y axis. Therefore, the flowmeter main body 31 is attached to the outer bottom surface 21b of the housing 20 so that the rotational locus circle 40 of the magnets 38 and 39, which are flow rate transmitting elements, and the central position 0 coincide with each other.

[0023]

The effect corresponding to the first aspect of the present invention: A positive displacement flowmeter main body having a pair of non-circular gears which meshes and rotates in a measuring chamber and has a transmitting element embedded in one of the end faces thereof, and a built-in battery. With a cylindrical counting unit having a sealed structure for detecting the movement of the transmitting element to perform flow rate calculation and displaying and / or remotely transmitting the flow rate signal, and a bottomed cylindrical body having an upper opening for housing the counting unit, The volumetric flowmeter is attached to the outer surface of the bottom, and a housing provided with a plurality of outer locking projections protruding outward on the inner circumference near the opening end is provided, and the outer locking projections of the housing cooperate with each other. In order to press the outer peripheral surfaces of the upper and lower end surfaces of the counting portion so that the counting portion housed in the housing can be visually displayed in the flow rate display, a plurality of inner locking protrusions protruding inward are provided. It is composed of a ring-shaped lid provided, and the lid is pivoted in the circumferential direction to engage the outside and inside. Engage the force, it is possible to provide an inexpensive deal volumetric flowmeter compact so mounted the counting unit to the volumetric flow meter body.

Effect corresponding to claim 2: In addition to the effect of the invention of claim 1, the material of the casing is metal, and the material of the lid is a resin material having a rigidity lower than that of the metal material. Since the counting unit is rotatable about the axis against the spring action of, the position where the flow rate display is most easily seen while being sealed when the counting unit is housed in the housing and pressed by the lid body It can be rotated to.

Effect corresponding to claim 3: In addition to the effect of the invention of claim 1, when the detecting element of the counter for detecting the movement of the transmitting element is projected on the end face of the non-circular gear,
Since the projection position is located on the circle of the locus of rotation of the transmitting element, the flow rate can be accurately measured without erroneous transmission regardless of the position of the counting unit by rotating the counting unit.

[Brief description of drawings]

FIG. 1 is a counting section for explaining an example of an embodiment of a counting section mounting structure of a volumetric flow meter according to the present invention.

FIG. 2 is a diagram for explaining a lid portion that houses the counting portion shown in FIG.

FIG. 3 is a diagram for explaining a housing that houses the counting unit shown in FIG. 1 and is equipped with a flowmeter main body.

FIG. 4 is a flow meter main body corresponding to the counting unit in FIG.

FIG. 5 is a partial side cross-sectional view for explaining an example of an embodiment of a counter portion mounting structure for a volumetric flow meter according to the present invention.

FIG. 6 is a diagram for explaining an embodiment of a mounting structure of the volumetric flow meter according to the present invention to a housing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Counting part, 2 ... Molded body, 3 ... Collar part, 4 ... Flow rate display part, 5 ... F / I (frequency / current) converter, 6 ... Flow rate detection part, 10 ... Lid part, 11 ... Ring-shaped body , 12 ... Openings, 1
3 ... Sealing collar, 14 ... Locking protrusion, 15 ... Insertion surface, 20 ... Housing, 21 ... Cylindrical body, 22 ... Upper opening, 23 ... Sealing collar, 2
4 ... Outer locking protrusion, 25 ... Inserting surface, 30 ... Flowmeter main body,
31 ... Main body, 32 ... Measuring chamber, 33 ... Flow path, 34 ... O-ring groove, 35, 36 ... Non-circular gear rotor, 37 ... Fixed shaft,
38, 39 ... Magnets.

Claims (3)

[Claims] 1. A positive displacement flowmeter main body having a pair of non-circular gears, which meshes and rotates in a measuring chamber and has a transmitting element embedded in one of its end faces, and a battery incorporated therein to detect movement of the transmitting element. A volumetric flow meter is provided on the outer surface of the bottom, which is a cylindrical counting unit having a sealed structure for performing flow rate calculation and remotely transmitting a flow rate display and / or a flow rate signal, and a bottomed cylindrical body accommodating the counting unit. And a housing provided with a plurality of outer locking protrusions protruding outward on the inner circumference near the opening end,
In cooperation with the outer locking protrusion of the casing, the protrusions are pushed inward in order to press the outer peripheral surfaces of the upper and lower end faces of the counting unit so that the flow rate display of the counting unit housed in the casing is visible. A ring-shaped lid provided with a plurality of inner locking projections at equal intervals, the lid is rotated in the circumferential direction to engage the outer and inner locking projections, and a fixing means such as a screw is provided. A counting part mounting structure for a volumetric flow meter, characterized in that the counting part is attached to the body of the volumetric flow meter without using it, and after the mounting, the casing and the lid are sealed. 2. The material of the housing is a metal, the material of the lid is a resin material having a rigidity lower than that of the metal material, and when the counting unit is housed in the housing and pressed by the lid, The counter part mounting structure for a volume flow meter according to claim 1, wherein the counter part is rotatable about an axis against the spring action of the lid. 3. When the detecting element of the counting section for detecting the movement of the transmitting element is projected on the end face of the non-circular gear,
3. The structure for mounting a counter of a volume flowmeter according to claim 1, wherein the projection position is on a circle of a locus of rotation of the transmitting element.