JPS6343689B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow meter for gases or liquids.
Conventionally, various types of flowmeters for measuring the flow rate of gas or liquid are known, including rotor-type flowmeters such as roots-type flowmeters and oval-type flowmeters, membrane-type (dry-type) gas meters, and Water meters that measure liquid flow using an impeller are widely used as flowmeters that directly measure the flow rate.

However, in such conventional rotor-type flowmeters, it is necessary to provide a slight space between the rotor and the wall of the measuring chamber, which may cause leakage of gas that is not being measured. Even in a liquid meter, there is a small gap between the impeller and the case wall, which causes a large pressure loss, which reduces the instrumental error performance especially at low flow rates and reduces the allowable range of application.

Furthermore, membrane gas meters have intricate gas passages and a complicated structure, which requires a large number of parts to manufacture.Also, because the force generated in the metering membrane needs to be transmitted to an interlocking mechanism, etc. However, there were problems such as the large size of the flowmeter and the large external size of the flowmeter.

In view of the problems of such conventional flowmeters, the present invention
In addition to improving instrumental error performance especially at low flow rates,
This was done for the purpose of providing a flowmeter with a simplified structure and reduced size.

The present invention will be explained below based on the accompanying drawings. FIG. 1a is a longitudinal sectional view of a flowmeter A of the present invention, and b
shows a cross-sectional view of a. In the figure, a flowmeter A has a cylindrical magnet 4 disposed in the center of a case 1 which has a fluid inlet 2 at the upper end and a fluid outlet 3 at the lower end. It has a structure in which a pair of cylindrical rotating magnets 7 and 8 are arranged around the passage 5 at equal intervals to form a measuring chamber. The case 1 is formed of a cylindrical peripheral wall 1a and circular side plates 1b, and a cylindrical magnet 4 is fixedly disposed at the center thereof. Further, one side 5a of the annular passage 5 formed by the outer periphery of the cylindrical magnet 4 and the inner wall of the case 1, which communicates from the fluid inlet 2 to the outlet 3, is narrower than the other side 5b. It is formed. This can be formed by making the wall thickness 6 of the peripheral wall 1a on the side 5a thicker.

Next, inside the annular passage 5 are a cylindrical magnet 7 that rotates while attracting the outer periphery of the cylindrical magnet 4, and a magnet 7 that rotates while attracting the outer periphery of the cylindrical magnet 4 and repelling the magnet 4. A plurality of pairs of magnets 8 having the same shape (three sets in the figure) are arranged around the magnet at equal intervals. As a means for disposing the pair of magnets around the magnets at equal intervals, support pieces 9 having protruding holding pieces 9a for holding the rotating magnets 7 at regular intervals are disposed around the outer surface of the magnet 4 so as to be freely rotatable. This can be done by holding the rotating magnet 7 on the holding piece 9a.

Therefore, the magnetic poles of magnets 7 and 8 are opposite to the magnetic pole of magnet 4, as shown in FIG. 1b.
The magnets are arranged so that their magnetic properties are opposite to each other, so that magnet 7 rotates while attracting magnet 4, while magnet 8 attracts magnet 7 and rotates.
In addition, since it rotates while repelling the magnet 4, it always rotates in contact with the inner wall of the cylindrical peripheral wall 1a, and the annular passage 5
is separated by the pair of magnets 7 and 8 to form a measuring chamber V. In this case, a fluid sealing material or a very small gap is formed between both ends of the magnets 7, 8 and the side plates 1b, so that the magnets 7, 8 can be rotated smoothly with respect to the side plates 1b without friction. configured. 10 is magnet 7,8
11 is a calculation display section that calculates the signal detected by the detection section 10 and displays the flow rate. Detection and display can be performed. In addition, these detection units 1
0 and the calculation display section 11 may be attached integrally to the case 1, or may be installed separately.

Next, to explain the operation of the flowmeter of the present invention when gas is targeted, first, the inlet 2
Gas introduced from the annular passage 5 flows into the annular passage 5, and gas pressure is simultaneously applied to both the pair of magnets on the wide passage 5b side and the pair of magnets on the narrow passage 5a, but the gas pressure is applied to the pair of magnets on the wide passage 5b side at the same time. Since the applied gas pressure is greater than the gas pressure applied to the pair of magnets on the narrow passage 5a side, the magnets 7 and 8, together with the support piece 9, rotate around the outer periphery of the cylindrical magnet 4 at the center in the direction of the arrow. In this case, the magnet 7 rotates while being in close contact with the magnet 4 by magnetic force, and the magnet 8 is repelled by the magnet 4 by magnetic force and comes into close contact with the inner wall of the peripheral wall 1a, and rotates while being in close contact with the magnet 7 by magnetic force. do. Figure 1a
A chamber V in the wide passage 5b blocked by the gas inlet/outlet and the magnets 7 and 8 indicates that the measuring chamber is established, and a chamber V in the narrow passage 5a blocked by the gas inlet and outlet and the magnets 7 and 8. A gas corresponding to the volume difference between the two chambers (not shown) is discharged from the outlet 3.

The detection unit 10 continuously detects magnetic changes caused by the rotation of the magnets 7 and 8 and sends the signal to the calculation display unit 11, which performs a predetermined conversion and displays the integrated flow rate value. do.

FIG. 2 shows another embodiment of the flowmeter of the present invention.
In the flowmeter B of this embodiment, the cylindrical magnet 12 disposed in the center of the case 1 has a shape in which the magnet 7 shown in FIG. The poles 13 are integrally protruded at equal intervals.
A magnet 14 is provided between the pole 13 and the inner wall of the peripheral wall 1a, and rotates in close contact with the inner wall of the peripheral wall 1a while magnetically attracting the pole 13. Furthermore, the cylindrical magnet 12 is provided with a central portion so as to be rotatable. is supported on a rotating shaft 15. In this case, magnet 14
is provided on the side pressed by the inflowing gas. The function of the flowmeter B shown in this embodiment is that the cylindrical magnet 12
The detector itself has a rotating structure, and the detection unit 1
0 is the same as the embodiment shown in FIG. 1, except that the rotation of the magnet 14 or the rotation of the rotating shaft 15 of the magnet 12 can be electrically or mechanically detected and integrated and displayed on the calculation display section 11.

As explained in detail above, the flowmeter of the present invention has a simple structure and few moving parts, so there is little pressure loss between the flowmeter inlet and outlet, and the instrumentation error performance at low flow rates is good, so measurement accuracy is greatly improved. Along with the improvement, the scope of use is also expanded. Furthermore, since the magnet is rotating, it is easy to detect the integrated signal in the detection section, and in the case of the embodiment shown in Fig. 1, the rotating magnet rotates on its own axis and revolves within the annular passage, so there is less friction and the flowmeter can be easily detected. It has many advantages such as improved durability.

[Brief explanation of drawings]

FIG. 1a is a longitudinal cross-sectional view of the flowmeter of the present invention, FIG. 1b is a cross-sectional view, and FIG. 2 is a longitudinal cross-sectional view showing another embodiment of the flowmeter of the present invention. 1... Case, 2... Fluid inlet, 3... Fluid outlet, 4... Magnet, 5... Annular passage, 7, 8
... Magnet, 9 ... Support piece, 10 ... Detection section, 11 ... Calculation display section, 12 ... Magnet,
13...Paul, 14...Magnet.

Claims (1)

[Claims] 1 One side communicating from the inlet to the outlet of an annular passage formed in a case with a cylindrical magnet disposed in the center, a fluid inlet at the upper end, and a fluid outlet at the lower end compared to the other side. A flowmeter characterized in that a plurality of cylindrical magnets, which are narrowly formed and rotate in contact with the cylindrical magnet and the inner wall of the case, are arranged around the annular passage at equal intervals.