JP6894610B2 - Membrane gas meter - Google Patents

Description

In the present invention, the reciprocating motion of the measuring membrane sent from the measuring chamber is converted into a rotational motion via a crank, and this rotational motion is transmitted to the propeller via an adjusting pin and on the rotational drive shaft of the propeller. The present invention relates to a membrane gas meter that detects the rotation of an attached permanent magnet with a magnetic sensor and calculates the flow rate from the signal of this magnetic sensor.

Examples of a membrane gas meter using a conventional propeller in the rotation transmission mechanism are shown in FIGS. 8 to 10.
In the case of this conventional example, the tips of the small elbows 101 and 102 are connected to the adjustment plate 104 by the adjustment pin 103, and the permanent magnet 100 is fixed to the small elbow 101 as shown in FIG. 8, and the adjustment plate 104 Is connected to the crank 106 by the adjusting pin 103, and the crank 106 is rotated by the small elbows 101 and 102.

In FIG. 8, 107 is a worm mechanism, which is interlocked with a mechanical flow rate indicator (not shown) via a horizontal rotation shaft 108.

In the case of the conventional gas meter shown above, since the permanent magnet 100 is connected by the small elbow 101, a deviation is likely to occur when assembling with the magnetic sensor, and if this deviation occurs, a measurement error occurs and the reliability as a gas meter is generated. Sex is lost.

Therefore, instead of directly attaching the permanent magnet 100 to the small elbow metal 101, a method of transmitting the rotational movement of the adjusting pin 103 to the propeller and attaching the permanent magnet 100 to the propeller as shown in Known Document 1 (Aichi Clock) is used. Proposed.

In this method, since the propeller is rotated by the adjusting pin protruding from the adjusting plate 104, the misalignment at the time of assembly can be absorbed by the propeller, and the occurrence of measurement error can be suppressed.

An object of the present invention is to provide a high-precision gas meter that minimizes the influence of misalignment and has no measurement error in a gas meter that employs a rotation transmission mechanism that uses this propeller.

In order to achieve the above object, the invention according to claim 1 incorporates a pair of measuring membranes in a measuring chamber, and the reciprocating motion of the measuring membranes rotates a crank via a large elbow and a small elbow. In a membrane gas meter that rotates a permanent magnet by the rotation of a crank and detects the rotation of the permanent magnet by a magnetic sensor and outputs a flow rate signal, a. An adjustment plate is attached between the small elbow metal and the crank, and the adjustment plate and the small elbow metal are rotatably connected by an adjustment pin. The top of the adjustment pin is projected from the upper surface of the small elbow, and a cut surface from the upper end to the lower end is formed on the rear wall of the protruding adjustment pin, and a groove is formed on the upper part of the outer peripheral wall. A hollow portion having substantially the same diameter as the adjusting pin and lower than the height of the protruding adjustment pin and a slit for inserting the adjusting pin from the lateral direction are provided in the hollow portion and on the top surface around the upper opening. A substantially hollow cylindrical adjusting pin holder (A) having a brim portion for fitting with the groove portion and having a threaded portion on the outer peripheral wall is attached to the adjusting pin from the lateral direction, and the brim portion and the groove portion are fitted. Fit and fix, d. A substantially hollow columnar adjustment having an opening at the bottom, a hollow portion having a height higher than that of the protruding adjustment pin, and a dome-shaped top surface in which the central portion having a threaded portion on the inner peripheral wall bulges upward. The pin holder (B) is fitted and fixed to the adjusting pin holder (A) by screwing both screw portions to form an adjusting member. The top of the adjusting pin holder (B) engages between the propeller blades attached to the lower part of the rotary drive shaft that protrudes downward from the central bottom of the electron chamber located at the upper part of the adjusting pin. A permanent magnet is attached to the upper part of the rotary drive shaft in the electronic chamber, and the permanent magnet rotates the propeller blades that are engaged by the action of the adjusting member to make a circular motion by the rotation of the crank, and this rotational force is the rotational drive shaft. Rotating by being transmitted to, g. It is characterized in that the rotation of the permanent magnet is detected by a magnetic sensor provided in the electronic chamber and a flow rate signal is output.

Further, the invention according to claim 2 incorporates a pair of measuring membranes in a measuring chamber, rotates a crank via a large elbow and a small elbow by the reciprocating motion of the measuring membranes, and is permanently rotated by the rotation of the cranks. In a membrane gas meter that rotates a magnet and detects the rotation of this permanent magnet with a magnetic sensor and outputs a flow rate signal, a. An adjustment plate is attached between the small elbow metal and the crank, and the adjustment plate and the small elbow metal are rotatably connected by an adjustment pin. The top of the adjustment pin is projected from the upper surface of the small elbow, and a cut surface from the upper end to the lower end is formed on the rear wall of the protruding adjustment pin, and a groove is formed on the upper part of the outer peripheral wall. An adjustment collar is attached to the lower part of the adjustment pin. A hollow portion having an opening at the bottom, having substantially the same diameter as the adjusting pin and substantially the same height as the protruding adjusting pin, and a slit for inserting the adjusting pin from the lateral direction are provided in the hollow portion. An engaging claw that is freely engaged with the cut surface of the adjusting pin and has elasticity is formed in the slit opening, and is fitted to the groove portion of the adjusting pin on the inner peripheral wall in the opposite direction of the engaging claw. A substantially columnar adjusting pin holder (C) having a dome-shaped top surface whose central portion bulges upward is attached to the adjusting pin from the lateral direction to fit the brim portion and the groove portion. Then, by rotating only this adjustment pin holder (C) horizontally 90 degrees toward the cut surface side, the engaging claw is engaged with the cut surface, and the adjustment pin and the adjustment pin holder (C) are engaged. To form an adjusting member, e. The top of the adjusting pin holder (C) engages between the propeller blades attached to the lower part of the rotary drive shaft that protrudes downward from the central bottom of the electron chamber located at the upper part of the adjusting pin. A permanent magnet is attached to the upper part of the rotary drive shaft in the electronic chamber, and the permanent magnet rotates the propeller blades that are engaged by the action of the adjusting member to make a circular motion by the rotation of the crank, and this rotational force is the rotational drive shaft. Rotating by being transmitted to, g. It is characterized in that the rotation of the permanent magnet is detected by a magnetic sensor provided in the electronic chamber and a flow rate signal is output.

According to the present invention, even if a misalignment occurs between the adjusting pin and the propeller when assembling the gas meter, the adjusting member has a degree of freedom for adjustment between the adjusting pin and the propeller. It is possible to prevent the measurement accuracy from being adversely affected.

According to the second aspect of the present invention, the adjustment between the adjustment pin and the propeller can be performed with the adjustment pin holder of only one component, and the adjustment pin holder can be easily assembled and attached / detached.

Is a longitudinal front view of the entire membrane gas meter. Is a cross-sectional view taken along the line AA'. Is a cross-sectional view showing a crank mechanism and a propeller portion. (A) is a vertical sectional front view of the adjustment pin. (B) is a vertical sectional front view of the adjustment pin holder (A). (C) is a vertical sectional front view showing a state in which the adjustment pin holder (A) is attached to the adjustment pin. (D) is a vertical sectional front view of the adjustment pin holder (B). (E) is a vertical sectional front view showing a state in which the adjustment pin holder (A) and the adjustment pin holder (B) are attached to the adjustment pin. (A) to (e) are explanatory views of the procedure for attaching the adjustment pin holder (A) and the adjustment pin holder (B) according to the first embodiment to the adjustment pin. It is explanatory drawing of the adjustment pin holder (C) described in Example 2 (a)-(d). (A) to (f) are explanatory views of the procedure for attaching the adjustment pin holder (C) according to the second embodiment to the adjustment pin. It is explanatory drawing of the conventional gas meter. It is explanatory drawing of the crank part of the conventional gas meter. It is sectional drawing of the crank part of the conventional gas meter.

Hereinafter, embodiments of the present invention will be described in detail based on the attached drawings.

Reference numeral 1 in the drawing is a gas meter main body, and 2 is a measuring chamber formed in the lower half of the gas meter main body 1, and measures the flow rate of gas by reciprocating two measuring membranes 3 by gas pressure. This configuration is a known technique.

Reference numeral 5 denotes a spindle attached in a vertical direction in which the reciprocating motion of the measuring film 3 is rotated by a constant angle via a lever 4, and the upper end side 5a of the spindle 5 projects from the measuring chamber 2 to the machine chamber 20. , It is transmitted to the crank 8 via the large elbow 6 and the small elbow 7 to this protruding portion, and the crank 8 is converted into a rotary motion.

An adjustment plate 9 is attached to the crank 8, and the tip of the small elbow metal 7 is connected to the adjustment plate 9 via an adjustment pin 11.

The adjustment pin holder (A) 23 is fixed to the adjustment pin 11 with the top of the adjustment pin 11 exposed, and the adjustment pin holder (A) is screwed from above the adjustment pin holder (A) 23. An adjustment pin holder (B) 24 for fixing to A) is assembled, and the top of the adjustment pin holder (B) 24 is downward between eight propeller blades 13 at equal intervals provided in the lower part of the electronic chamber 15. The rotation is transmitted to the propeller 12 by the circular motion of the adjusting pin 11.

The rotation of the propeller 12 causes the permanent magnet 14 installed on the rotation axis of the propeller 12 to rotate.

Reference numeral 16 denotes a magnetic sensor that detects the rotation of the permanent magnet 14 and outputs a flow rate signal, and the magnetic sensor 16 and the power supply 17 are housed in a sealed electronic chamber 15.

In the figure, 10 is a worm, 18 is a gas inlet, 19 is a metered gas outlet, and in FIG. 2, 21 is a valve and 22 is a valve drive lever.

In the gas meter according to the present invention described above, when a gas flows in from the gas inflow port 18, the gas drives the measuring film 3 in the measuring chamber 2, and the driving causes the spindle 5 to rotate by a constant angle. The rotation causes the crank 8 to rotate via the large elbow 6 and the small elbow 7.

At the same time, the valve drive lever 22 opens and closes the gas flowing into the measuring chamber 2 and the valve 21 flowing out from the measuring chamber 2.

When the adjusting plate 9 of the crank 8 rotates, the adjusting pin 11 protruding from the crank 8 makes a circular motion to rotate the propeller 12.

Due to the rotation of the propeller 12, the permanent magnet 14 installed on the rotation drive shaft to which the propeller 12 is attached rotates, and the magnetic sensor 16 detects this rotational movement and outputs a flow rate signal to output a flow rate signal (FIG. Not shown.) Is driven.

When an error occurs between the position of the propeller 12 and the adjustment pin 11 in the above operation, the propeller 12 is adjusted by adjusting the adjustment pin holder (A) 23 and the adjustment pin holder (B) 24 attached to the adjustment pin 11. Adjust the engagement relationship with.

As a result, if the positional relationship between the propeller 12 and the adjustment pin 11 has an error compared to the initial assembly, or if an error occurs over time, it can be easily adjusted so that it will be in a normal state. It is possible to eliminate instrumental errors.

4 and 5 are explanatory views of the adjustment pin holder (A) 23 and the adjustment pin holder (B) 24 and the procedure for attaching the adjustment pin holder to the adjustment pin 11, and are shown in FIGS. 5 (a) to 5 (d). Assemble each part as shown in (e) in the procedure.

In FIG. 5, the adjustment pin holder (A) 23 is adjusted so that the straight portion 27 of the slit provided in the adjustment pin holder (A) 23 and the cut surface 28 formed on the rear wall of the adjustment pin 11 are parallel to each other. It is fixed by fitting the groove portion 25 and the brim portion 26 in the lateral direction ((a) to (d)), and then adjusted with the screw portion 29 provided on the outer peripheral wall of the adjustment pin holder (A) 23. The adjusting pin holder (B) 24 is fitted from above the adjusting pin holder (A) 23 by screwing the screw portion 30 provided on the inner peripheral wall of the pin holder B (e).

The second embodiment relates to the structure of the adjusting pin holder (C) 31 which is attached to the adjusting pin 11 and engaged between the propeller blades 13 from below as in the first embodiment. In FIG. 6, the adjusting pin holder (C) In the slit opening formed in) 31, an engaging claw 32 that is freely engaged with the adjusting pin 11 and has elasticity is formed, and the adjusting pin holder (C) 31 is placed at the lower part of the adjusting collar 34. Is attached to the adjustment pin 11 to which the adjustment pin 11 is attached from the lateral direction, and after the groove portion 25 and the brim portion 33 are fitted, only the adjustment pin holder (C) 31 is attached to the cut surface 28 formed on the rear wall of the adjustment pin. By rotating the engaging claw 32 horizontally by 90 degrees toward the side, the engaging claw 32 is engaged with the cut surface 28 to fix the adjusting pin 11 and the adjusting pin holder (C) 31.

Since this adjustment pin holder (C) 31 does not require tools or the like at the time of mounting and removal and can be fixed to the adjustment pin 11 with one part, it is not only easy to assemble, but also the adjustment pin holder (C) 31 and When a defect occurs in the adjusting pin 11 and the engagement relationship with the propeller 12 is repaired, it can be easily removed and adjusted as compared with the adjusting pin holder of the first embodiment.

FIG. 7 shows a procedure for attaching the adjustment pin holder (C) 31 described in the second embodiment to the adjustment pin 11, and each component is assembled as shown in (f) in the procedures (a) to (e).

1 Gas meter body 2 Measuring chamber 3 Measuring membrane 4 Lever 5 Spindle 6 Large elbow 7 Small elbow 8 Crank 9 Adjusting plate 10 Warm 11 Adjusting pin 12 Propeller 13 Propeller blade 14 Permanent magnet 15 Electronic chamber 16 Magnetic sensor 17 Power supply 18 Gas Inlet 19 Gas outflow 20 Machine room 21 Valve 22 Valve drive lever 23 Adjustment pin holder (A)
24 Adjustment pin holder (B)
25 Groove 26 Brim 27 Slit straight line 28 Cut surface 29 Thread 30 Thread 31 Adjustment pin holder (C)
32 Engagement claw 33 Brim 34 Adjustment collar

Claims (2)

A pair of measuring membranes are incorporated in the measuring chamber, and the reciprocating motion of the measuring membranes rotates the crank via the large and small elbows, and the rotation of this crank rotates the permanent magnets and the rotation of the permanent magnets. In a membrane gas meter that detects with a magnetic sensor and outputs a flow rate signal,
a. An adjustment plate is attached between the small elbow and the crank, and the adjustment plate and the small elbow are rotatably connected by an adjustment pin.
b. The top of the adjustment pin is projected from the upper surface of the small elbow, and a cut surface from the upper end to the lower end is formed on the rear wall of the protruding adjustment pin, and a groove is formed on the upper part of the outer peripheral wall.
c. A hollow portion having substantially the same diameter as the adjusting pin and lower than the height of the protruding adjustment pin and a slit for inserting the adjusting pin from the lateral direction are provided in the hollow portion and on the top surface around the upper opening. A substantially hollow cylindrical adjusting pin holder (A) having a brim portion for fitting with the groove portion and having a threaded portion on the outer peripheral wall is attached to the adjusting pin from the lateral direction, and the brim portion and the groove portion are fitted. To fit and fix,
d. A substantially hollow columnar adjustment having an opening at the bottom, a hollow portion having a height higher than that of the protruding adjustment pin, and a dome-shaped top surface in which the central portion having a threaded portion on the inner peripheral wall bulges upward. The pin holder (B) is fitted and fixed to the adjustment pin holder (A) by screwing both screw portions to form an adjustment member.
e. The top of the adjustment pin holder (B) engages between the propeller blades attached to the lower part of the rotary drive shaft that protrudes below the central bottom of the electron chamber located above the adjustment pin.
f. A permanent magnet is attached to the upper part of the rotary drive shaft in the electronic chamber, and the permanent magnet rotates the propeller blades that are engaged by the action of the adjusting member to make a circular motion by the rotation of the crank, and this rotational force is the rotational drive shaft. Rotating by being transmitted to
g. To detect the rotation of the permanent magnet by a magnetic sensor provided in the electronic chamber and output a flow rate signal.
Membrane type gas meter featuring. A pair of measuring membranes are incorporated in the measuring chamber, and the reciprocating motion of the measuring membranes rotates the crank via the large and small elbows, and the rotation of this crank rotates the permanent magnets and the rotation of the permanent magnets. In a membrane gas meter that detects with a magnetic sensor and outputs a flow rate signal,
a. An adjustment plate is attached between the small elbow and the crank, and the adjustment plate and the small elbow are rotatably connected by an adjustment pin.
b. The top of the adjustment pin is projected from the upper surface of the small elbow, and a cut surface from the upper end to the lower end is formed on the rear wall of the protruding adjustment pin, and a groove is formed on the upper part of the outer peripheral wall.
c. An adjustment collar is attached to the bottom of the adjustment pin.
d. A hollow portion having an opening at the bottom, having substantially the same diameter as the adjusting pin and substantially the same height as the protruding adjusting pin, and a slit for inserting the adjusting pin from the lateral direction are provided in the hollow portion. An engaging claw that is freely engaged with the cut surface of the adjusting pin and has elasticity is formed in the slit opening, and is fitted to the groove portion of the adjusting pin on the inner peripheral wall in the opposite direction of the engaging claw. A substantially columnar adjusting pin holder (C) having a dome-shaped top surface whose central portion bulges upward is attached to the adjusting pin from the lateral direction to fit the brim portion and the groove portion. Then, by rotating only this adjustment pin holder (C) horizontally 90 degrees toward the cut surface side, the engaging claw is engaged with the cut surface, and the adjustment pin and the adjustment pin holder (C) are engaged. To fix and configure the adjusting member,
e. The top of the adjustment pin holder (C) engages between the propeller blades attached to the lower part of the rotary drive shaft that protrudes below the central bottom of the electron chamber located above the adjustment pin.
f. A permanent magnet is attached to the upper part of the rotary drive shaft in the electronic chamber, and the permanent magnet rotates the propeller blades that are engaged by the action of the adjusting member to make a circular motion by the rotation of the crank, and this rotational force is the rotational drive shaft. Rotating by being transmitted to
g. To detect the rotation of the permanent magnet by a magnetic sensor provided in the electronic chamber and output a flow rate signal.
Membrane type gas meter featuring.

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