JP3201593B2 - Flowmeter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetically coupled flow meter.

[0002]

2. Description of the Related Art A flowmeter has an area flowmeter which measures a flow rate by detecting displacement of a moving element in a pipe due to a fluid force of a fluid flowing through the pipe. The pipe has a moving element. There is a transparent tube such as a glass tube or a plastic tube so that the displacement state can be visually recognized from outside. However, in the case of a glass tube or a plastic tube, there is a problem in terms of strength and corrosiveness due to a chemical solution. Therefore, a metal tube having high strength and corrosion resistance, for example, a stainless steel tube is used.

[0003] In a metal tube, the state of the moving member inside cannot be visually recognized from the outside. Therefore, a follower that follows the movement of the moving member is provided outside the tube. Has a built-in magnet or a magnet, and the driven body is also formed of a magnet or a built-in magnet, and the moving element and the driven body are so-called magnet couplings that are magnetically coupled.

In this magnet-coupled area flowmeter, the follower follows the movement of the moving element as described above. However, when the flow rate of the fluid flowing through the tube changes abruptly, in particular, the first If the moving element moves rapidly by the fluid head at the time of inflow, the follower cannot follow it, so the magnetic coupling force between them becomes smaller than the gravity of the follower, and the follower returns to the reference position. There is a problem that erroneous indication such as zero in the flow rate display often occurs.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flow meter capable of solving the above-mentioned conventional problems by the follower faithfully following even when the flow rate changes rapidly.

[0006]

In order to achieve the above object, a flow meter according to the present invention is provided in which a magnet or a magnet or a moving element having a built-in magnet in a horizontal tube is moved by a fluid force of a fluid flowing through the tube. In a flow meter in which an outer magnet or driven body with a built-in magnet is moved following a moving element by magnetic coupling with a moving element, a surface of the magnet or a built-in magnet for backup magnetic force generated by the backing element facing the driven element may be moved. It is provided on the outside of the fluid inlet and fluid outlet of the tube body facing the driven body so as to have the same polarity.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings. FIG. 1 shows a flow meter according to a first embodiment of the present invention, and reference numeral 1 denotes a horizontal tubular body of an area flow meter.
In this embodiment, at least the inner side surface is a laterally tapered tube expanding in diameter from the fluid inlet 2 to the fluid outlet 3, and is made of metal such as stainless steel so that the fluid flows in the lateral direction. Reference numeral 4 denotes a mover provided in a tapered tube, which is formed of a magnet or a magnetic force generator containing a magnet. Thus, the moving element 4 is provided with a resistance against the flow of the fluid by the spring 5.

Reference numeral 6 denotes a follower that follows the movement of the moving element, which is constituted by a magnet or a magnetic force generator having a built-in magnet. The follower is a ring-shaped member arranged around the tapered tube 1.
A plurality of lateral holes 7 formed at appropriate positions are fitted in a plurality of lateral guide shafts 8 so that they can be stopped by magnetic coupling with the mover. It can be moved.

Further, according to the present invention, two ring-shaped backup magnetic force generating members 9a and 9b having the same pole on the surface facing the follower 6 are provided on the left and right sides of the follower, that is, tapered. The tube is fixedly provided outside the fluid inlet side and the fluid outlet side as appropriate, and the magnetic force generator for backup is constituted by a magnet or a magnet having a built-in magnet.

[0010] In the drawing, reference numeral 10 denotes a guide shaft of the mover, which is arranged on the center axis in the tapered pipe.
A horizontal hole 15 formed in the center of the mover is loosely fitted therein, reference numeral 11 is an indicator piece provided on the follower, 12 is a flow rate display scale plate, 13a is an inlet-side stopper for the mover,
13b denotes the outlet side stopper. In this embodiment, a compression coil spring is used for the spring 5,
It is interposed between the mover 4 and the outlet stopper 13b of the tapered tube, but one end thereof is fixed to the inlet side stopper 13a and the other end is fixed to the mover 4 by using a tension spring. In some cases.

[0011]

In this embodiment, the magnetic coupling force (F) between the mover and the driven body is determined by the repulsive force (f ₁ ) between the driven body and the inlet-side backup magnetic force generator 9a, and the driven body and the outlet-side backup magnetic force. Is larger than the repulsive force (f ₂ ) with the magnetic force generator 9b, and the mover moves left and right in the axial direction of the tapered pipe due to a change in the flow rate of the fluid flowing through the pipe. The follower also moves left and right.

When the movable element is stationary in the tapered tube at a position corresponding to the flow rate of the fluid, the driven element is stopped by the magnetic coupling force with the movable element against the repulsive force with the backup magnetic force generator. are doing.

In this state, when the flow rate suddenly increases and the moving element rapidly moves to the left against the spring 5, the distance between the moving element 4 and the follower 6 becomes large when the moving element starts moving. Therefore, the magnetic coupling force (F) between the mover and the follower, which has suppressed the repulsive force (f ₁ ) with the inlet-side backup magnetic force generator 9a, becomes smaller, and the follower becomes the inlet-side backup. Is pushed to the left by the repulsive force (f ₁ ) of the magnetic force generator 9a, and moves leftward following the moving element. Therefore, even if the flow rate suddenly increases, the driven body cannot follow and is not left behind.

When the flow rate suddenly decreases, the movable element is pushed by the spring 5 and moves quickly to the right. When the movable element starts moving, the distance between the movable element 4 and the follower 6 increases. As a result, the magnetic coupling force (F) between the mover and the driven body, which has suppressed the repulsion force (f ₂ ) with the exit-side backup magnetic force generator 9b, becomes small, so that the driven body becomes the outlet-side backup. Is pushed to the right by the repulsive force (f ₂ ) of the magnetic force generator 9b, and moves rightward following the moving element. Therefore, even if the flow rate suddenly decreases, the driven body cannot follow and is not left behind.

[0015] Incidentally, the tube is repulsive force between the magnetic force generating member 9a of the follower member and the inlet side backup (f ₁₎ and repulsive force between the magnetic force generating member 9b of the follower member and the outlet side backup and (f ₂₎ It is equal at the midpoint in the length direction of one.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, the tube 1 is a straight tube, but has an orifice 14 therein, and the moving member 4 is moved in the fluid flow direction (left direction in the figure). ) Is an area flow meter in which the moving element moves left and right in the orifice 14 in response to a change in the flow rate, and has the same structure as that of the first embodiment. The operation is the same as that of the first embodiment.

FIG. 3 shows a third embodiment of the present invention. The pipe 1 is a straight pipe, and the moving element is not a tapered body. The moving element is fluidized by a compression spring 5 interposed between the moving element and the outlet side stopper 13b. It is a flow meter that gives resistance to the flow of water. In this flow meter, the flow rate is measured by moving the movable element 4 against the spring 5 by the fluid force of the fluid, and the relationship between the magnetic force generator for backup and the driven element and others are first and second. The structure is the same as that of the embodiment, and the operation is the same as that of the first and second embodiments.

[0018]

According to the present invention, even if the flow rate of the fluid is rapidly increased and decreased and the moving element is rapidly moved, the driven body faithfully follows the moving element and the driven body malfunctions. And a highly reliable magnetically coupled flowmeter can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a flow meter according to the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the flow meter according to the present invention.

FIG. 3 is a longitudinal sectional view showing a third embodiment of the flow meter according to the present invention.

[Explanation of symbols]

 1 ··· Tube 2 ··· Fluid inlet 3 ··· Fluid outlet 4 ··· Moving element 5 ··· Spring 6 ··· Follower 7 ··· Vertical hole of follower 8 ··· Guide shaft 9a, 9b of follower Magnetic force generator for backup 10 ・ Guide shaft of mover 11 ・ ・ ・ ・ Index piece 12 ・ ・ ・ ・ Scale plates 13a, 13b ・ ・ Stopper 14 ・ ・ Orifice 15 ・ ・ Horizontal hole of mover

Claims (1)

(57) [Claims] 1. A magnet or a movable element with a built-in magnet in a horizontal tubular body is moved by the fluid force of a fluid flowing through the tubular body, and a magnet or a driven body with a built-in magnet outside the tubular body is moved by magnetic coupling with the movable element. In a flowmeter that is moved to follow the rotor, a magnet or a backup magnetic force generator with a built-in magnet is opposed to the driven body so that the surface facing the driven body has the same polarity, and the fluid inlet of the pipe and the fluid A flow meter provided outside the outlet.