JP2523865Y2 - Vibration-proof mass flowmeter - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vibration-proof mass flowmeter supported on a fixed member via a vibration-proof material having no fixing means so that the accuracy of the Coriolis flowmeter is not reduced by external vibration. .

The Coriolis flowmeter that measures the mass flow rate is provided with a support point on a vibrating tube through which the fluid flows, and when a vibration of angular velocity ω is applied around the support point, the Coriolis force acting on the fluid changes the mass flow rate m. It utilizes the proportionality. The vibrating tube is a straight tube or a curved tube. When the vibrating tube is a straight tube, it is supported at two points across one section. It is fixed so as to open to the tube wall. When the bending tube is attached to the support tube with the support tube as the first axis and the axis perpendicular to the first axis as the second axis, the bending tube is arranged axially symmetrically with the second axis. The curved conduit is sinusoidally driven around the first axis by a driving means such as an electromagnet, and as a result, Coriolis force is generated around the second axis. The Coriolis force is measured as the time difference between the two arms of the curved conduit passing through the stationary plane of the curved conduit at a symmetric position about the second axis of the curved conduit, and the time difference is usually converted to a sine signal by electromagnetic means and then converted to a sine signal. The phase difference of the detected sine signal is obtained, and the sine signal is converted and output as a mass flow rate signal proportional to the phase difference.

As described above, the Coriolis flow meter detects the Coriolis force acting on the fluid to be measured flowing in the vibrating tube, and the Coriolis force is extremely small with respect to the vibration energy. The effects cannot be ignored. In particular, it is an essential requirement for a Coriolis flowmeter mounted on a moving device to take measures against vibrations, such as when measuring the mass flow rate of paint ejected by a painting robot. As a countermeasure against this vibration, the present applicant has previously proposed a vibration-proof mass flow meter of a type supported by a vibration-proof rubber.

FIG. 4 is a block diagram of the conventional vibration-proof mass flowmeter described above.
(A) is a front view, and (B) is a sectional view taken along the line Y-Y. In the figure, reference numeral 21 denotes a base, which is fixed to a moving body such as a painting robot. 22 is an external conduit through which the liquid to be measured is circulated,
Reference numerals 23 and 24 denote inlets and outlets of the Coriolis flow meter connected to the external conduit 22, and reference numeral 25 denotes a support pipe that supports both ends of the curved vibrating tube 27 and communicates with the inlet 23 and the outlet 24. And 26 are outer casings for accommodating and protecting the vibrating tube, driving means, and detectors (not shown), which are main parts of the Coriolis flowmeter. The Coriolis flowmeter comprises a support pipe 25 and an outer casing 26 shown in the figure. It is the part that is done. Reference numeral 28 denotes a support fitting having an L-shaped cross section, reference numeral 29 denotes a plate-like support plate, reference numeral 30 denotes a support frame, and reference numeral 31 denotes an anti-vibration rubber. The support frame 30 is a housing that elastically supports and accommodates the Coriolis flowmeter with an anti-vibration rubber 31 and is fixed to the base 21 on one surface of the housing.
Are fixed to the upper and lower surfaces of the housing. The other end of the anti-vibration rubber 31 on the upper side of the housing is the support pipe 25 of the Coriolis flow meter.
The other end on the lower surface side of the housing is screwed to the lower surface of the outer housing 26 and is fixed to the support plate, respectively, on the L-shaped support fitting 28 screwed to the support member. As described above, the Coriolis flow meter is supported in the support frame 30 through the vibration isolating rubber 31, and has an effect of preventing the vibration of the Coriolis flow meter by the vibration isolating effect of the vibration isolating rubber 31 when the base 21 vibrates. Things.

Problems of the conventional technology The conventional anti-vibration mass flowmeter described above can obtain a good anti-vibration effect in the normal piping vibration range of 10 to 60 Hz due to the anti-vibration effect of the anti-vibration rubber, If it is large, both ends of the vibration isolating rubber 31 are screwed, so when a tensile force acts on the upper surface, a compressive force acts on the lower surface, the spring constant increases, and the angular displacement and swiveling motion of the arm of the painting robot also occurs. The result was not always satisfactory, and the mass flow indicated value was sometimes inaccurate, making it more responsive and unsuitable for a painting robot.

Means for Solving the Problems The present invention has been made in view of the above-mentioned problems, and is intended to prevent the accuracy from being affected even when the Coriolis flow meter receives a large vibration energy. The inflow side of the support tube, which connects to the flowing external conduit,
A body that is supported on the outflow side and detects a mass flow rate from Coriolis force acting on the vibrating tube that circulates the fluid to be measured;
In a mass flow meter comprising an outer housing for housing the main body,
The mass flow meter is fixed to a fixed member consisting of an intermediate frame and a lower support bracket at predetermined gaps between upper, lower, front, rear, left and right surfaces of the mass flow meter outer casing. The gist is a vibration-proof mass flowmeter in which a vibration-proof member having no means is pressed against the mass flowmeter and the mass flowmeter is supported on the fixed member via the vibration-proof member.

Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention.
(A) is a front view, and (B) is a sectional view taken along the line Y-Y. In the figure, reference numeral 1 denotes a base, which is fixed to a moving body such as a painting robot and moves. Reference numeral 2 denotes an external conduit, which is, for example, a flexible pipe through which paint supplied to a painting robot is distributed. Reference numeral 3 denotes an inflow port of the Coriolis flowmeter, 4 denotes an outflow port, 5 denotes a support tube which communicates with the inflow port 3 and the outflow port 4 to support a vibrating tube (not shown) that generates a Coriolis force, and 6 denotes a support tube. A drive means for cantilevering and vibrating the vibrating tube, and an outer housing for accommodating a main part of a Coriolis flowmeter such as a detector (not shown) generated by driving, here, a support tube 5 and an outer housing which are integrally formed. 6 is collectively called a Coriolis flowmeter. Reference numeral 7 denotes an upper support fitting having a U-shaped cross section, one side of which is fixed to the base 1. Reference numeral 8 denotes a holding fitting having an L-shaped cross section, which is fixed to the support tube 5. Reference numeral 9 denotes one side fixed to the base 1.
, An intermediate frame large enough to be inserted up and down with a predetermined gap, 10 is a box-shaped lower support fitting that covers the lower part of the outer casing 6 in the predetermined gap, and 11 is a vibration damping member made of silicon-based gel-like rubber. The shape is a plate. Instead of the plate-like body, a shape such as a columnar body or a truncated cone may be used. The anti-vibration mass flow meter of the present invention having the above-described structure is provided in a predetermined gap provided between the upper support metal member 7, the intermediate frame 9, the lower support metal member 10 and the Coriolis flow meter having one surface fixed to the base 1. A vibration isolating member 11 made of silicon-based gel-like rubber is interposed in a compressed state without using fixing means, and the silicon-based gel-like rubber is used as a vibration-isolating material to absorb external vibration energy and affect the Coriolis flowmeter. There is no such thing. The silicone gel rubber, which is a main part of the present invention, is a gelatinous silicone rubber in a gel state in an intermediate state between a liquid and a solid, and has weather resistance, moisture resistance, heat resistance, electric characteristics, and external vibration energy. Is absorbed by the displacement and the internal friction caused by the displacement.

FIG. 2 is a structural view of the vibration isolating member 11, in which (A) is a side sectional view and (B) is a perspective view of a constituent element.
Is a silicon-based gel-like rubber plate, 13 is a thin rubber cap, and has a bottomed cylindrical shape. The silicone gel rubber 12 is housed in the bottomed cylindrical thin rubber cap 13 to prevent the silicone gel rubber from being stained by paint, oil or the like scattered from the outside. Although the shape of the thin rubber cap 13 is a cylindrical shape with a bottom, the shape of the thin rubber cap is not limited to this, and may be a cylindrical shape and cover the side surface of the silicon-based gel-like rubber. In FIG. 1, four anti-vibration members 11 are provided on the front and rear surfaces and two are provided on the side surfaces.
And two on each of the upper and lower surfaces, and are provided evenly in a symmetrical position on each surface in all directions of the Coriolis flowmeter, simply by being pressed against each other.

FIG. 3 shows another embodiment relating to the arrangement of the vibration isolating member 11,
Elements common to FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. Note that, since the drawing shows the arrangement of the vibration isolating members 11, the base 1, the intermediate frame 9, and the lower fitting 10 are not shown. In the figure, G is a position where the front, rear, both side surfaces and upper and lower surfaces of the Coriolis flow meter vertically intersect with the center of gravity of the Coriolis flow meter, and it is effective to interpose the vibration isolating member 11 at this G position. Vibration can be absorbed. In the above description, the vibrating tube is a curved tube, but it is also effective in the case of a straight tube.

Effects As is apparent from the above description, according to the vibration isolating mass flow meter of the present invention, a vibration isolating member made of silicon-based gel-like rubber is provided between the Coriolis flow meter and the fixing member by fixing means such as a screw. By supporting the Coriolis flow meter by pressing it elastically without using it, the vibration isolator is absorbed in the compression direction in any vibration direction and is not pulled, so the vibration energy is not broken by the pulling force. Since the strain in the vibration direction of the silicon-based gel-like rubber is absorbed by the internal friction due to the strain, the mass flow meter can be used for external vibrations which cannot be eliminated by the conventional vibration-proof rubber, for example, for a quick-response coating robot. It can be attached and can measure a stable mass flow rate without lowering the accuracy.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of the vibration isolating mass flow meter of the present invention, (A) is a plan view, (B) is a sectional view taken along the line YY, FIG. 2 is a configuration diagram of a vibration isolating member, and FIG. FIG. 4 shows another embodiment of the arrangement of the vibration isolating members, and FIG. 4 is a configuration diagram of a conventional vibration isolating mass flow meter. 1,21 …… Base, 5,25 …… Support tube, 6,26 …… Outer casing, 11 ……
Anti-vibration member, 12 ... Silicon gel rubber, 13 ... Thin rubber cap.

Claims (5)

(57) [Scope of request for utility model registration] 1. A main body which is supported on an inflow side and an outflow side of a support pipe connected to an external conduit through which a fluid to be measured flows, and detects a mass flow rate from Coriolis force acting on a vibrating pipe through which the fluid to be measured flows. And, in a mass flow meter comprising an outer housing for housing the main body, the mass flow meter is provided with a predetermined gap between the intermediate frame and a fixed member including a lower support fitting, respectively.
An anti-vibration member having no fixing means is pressed between the upper, lower, front, rear, left and right surfaces of the mass flow meter outer casing, and the mass flow meter is interposed through the anti-vibration member. An anti-vibration mass flowmeter supported on a fixed member. 2. The mass flow meter according to claim 1, wherein the vibration isolator is made of a silicone gel rubber. 3. The mass flowmeter according to claim 1, wherein the vibration isolator is covered with a thin rubber. 4. The vibration-proof mass flowmeter according to claim 1, wherein the vibration-proof member is interposed at a symmetric position on each surface of the mass flowmeter. 5. The vibration-proof mass flowmeter according to claim 1, wherein the vibration-proof member is interposed at a position where the center of gravity of the mass flowmeter intersects perpendicularly with each surface of the mass flowmeter.