KR101034435B1 - A rotor RPM measuring apparatus for gear-type positive displacement flow-meters - Google Patents

Abstract

A device for measuring the rotational speed of a rotor of a flowmeter by connecting a rotary shaft of a general-purpose encoder (hereinafter referred to as an encoder rotary shaft) to a measuring rotary shaft of a volumetric flowmeter, wherein one end of the measuring rotary shaft is fastened to a mounting plate outside the flowmeter pipe that protrudes, A base adapter having a first insertion hole formed in the center and having two inner diameter surfaces of which the inner diameter of the upper portion of the first insertion hole is larger than the inner diameter of the lower portion; An encoder having an outer diameter surface formed in two stages to be fitted into the first insertion hole of the base adapter, a second insertion hole formed in the center, and an inner diameter surface of two stages having an inner diameter of the upper portion of the second insertion hole larger than the inner diameter of the lower portion. adapter; It has an outer diameter surface formed in two stages to be fitted into the second insertion hole of the encoder adapter, the upper end is formed with a first fitting groove into which one end of the encoder rotation shaft is fitted, and the lower end has a connection shaft formed so as to fit one end of the measurement rotation shaft. Provide a configuration to include.

By the rotor rotation speed measuring device of the volumetric flow meter as described above, it is possible to easily attach / detach any volumetric flowmeter using a general-purpose encoder, and to accurately measure the rotation speed of the rotor.

Volumetric, Flowmeter, Encoder, Adapter, Rotation, Measurement

Description

A rotor RPM measuring apparatus for gear-type positive displacement flow-meters}

The present invention relates to an apparatus for measuring the rotational speed of a rotor of a flowmeter by connecting a rotational shaft of a general-purpose encoder to a measurement rotational shaft of a volumetric flowmeter.

In particular, the present invention constitutes a separate shaft connecting the rotary shaft of the general-purpose encoder and the measurement rotary shaft of the flowmeter, and measures the rotor rotation speed of the volumetric flowmeter for separately forming and assembling an adapter capable of supporting and combining the encoder and the mounting plate of the flowmeter. Relates to a device.

In general, a positive displacement flowmeter is a device having two elliptical rotors engaged with each other and measuring flow rate or rotational angle of the rotor. That is, since the two elliptical rotors rotate with each other and the fluid flows in proportion to the rotational speed or rotational angle (hereinafter, referred to as rotational speed), the flow rate is obtained by measuring the rotational speed or rotational angle of the rotor. Also, instead of an elliptical rotor, two screws may be engaged and rotated to measure the rotational speed or rotational angle of the screw to obtain a flow rate.

The non-contact flowmeter which measures the number of revolutions of the rotor or screw of the volumetric flowmeter by installing magnetic induction such as magnetic at the end of the rotating body along with the rotating shaft of the rotor, etc. And a contact flow meter (or mechanical flow meter) which is directly connected to a rotating shaft such as a rotor by a coupling or the like to form a second rotating shaft (or a rotating shaft for measurement) perpendicular to the rotating shaft of the rotor and measures the rotational speed of the second rotating shaft. Are distinguished.

As shown in FIG. 1A, a conventional mechanical flow meter includes a rotor part 820, an extension part 830, an instrument panel 840, a signal generator 850, and a rotation transmission 860.

The rotor unit 820 is installed between the fluid pipes 810 and is an FD meter capable of measuring the flow rate by the rotation speed of the rotor. The second rotating shaft (or the measuring rotating shaft) directly coupled to the rotating shaft of the rotor protrudes outwardly from the rotor portion 820.

The measurement axis of rotation extends upwardly by the extension 830. As the instrument panel 840 installed on the upper portion of the extension portion 830 is raised by the extension portion 830, the reader can easily see the instrument panel. That is, the instrument panel 840 is a device for checking the flow rate with the naked eye on the field meter directly.

The rotary transmission 860 is provided between the instrument panel 840 and the extension 830, and the signal generator 850 is connected to the rotary transmission 860.

As shown in Figure 1b, the rotary transmission 860 is composed of a plurality of gears 861 to display the gauge number of the instrument panel 840 in accordance with the flow rate unit. That is, the shaft 862 shifted to the rotary transmission 860 is connected to the instrument panel 840 so that the instrument numbers of the instrument panel 840 rotate to display the flow rate. If there is a difference between the flow rate measured by using the gears constituting the rotary transmission 860 and the actual flow rate, it may be corrected.

In addition, one gear 861 of the rotary transmission 860 and the rotating plate 851 of the signal generator 850 are engaged. The signal generator 850 converts the rotation of the rotating plate 851 into an electrical signal by the phototransistor 852. The electrical signal is transmitted to the outside through the amplifier 854.

However, in the conventional volumetric flowmeter as described above, since a plurality of gears are used in the rotary transmission 860, when the gears become old, an error occurs in the number of revolutions and the maintenance and repair costs increase.

Specifically, since the measurement signal is sent to both the mechanical instrument panel 840 for on-site confirmation by the rotary transmission 860 and the signal generator 850 for generating an electrical signal, the signals on both sides are inconsistent and reliable for flow measurement. Drop significantly.

In addition, in the case of an old mechanical flow meter, it is difficult to obtain a component such as a gear for measuring the rotation speed of the rotor, or there is a problem in that manufacturing cost is high.

An example of a technique of measuring by connecting without using a rotating shaft and a gear of the rotor (or turbine) by overcoming the above problems is described in [Republic of Korea Patent Publication 10-2006-0027509 (March 28, 2006), "Mechanical Turbine Flowmeter" ] (Hereinafter referred to as prior art 1).

As shown in Figure 2, the prior art 1 is a mechanical type that connects the second rotary shaft 530 meshed with the rotary shaft worm gear 230 of the blade 400 and the first rotary shaft 520 of the measuring means 500 by magnets. A flowmeter, comprising: a first rotating shaft (520) provided in the measuring means (500) rotatably and provided with a first magnet (521) at an end thereof; The second rotation shaft 530 having the helical gear 510 is installed at the lower end and the second magnet 531 is installed at the upper end to have the same polarity as the first magnet 521 and maintain a predetermined gap therebetween. The first rotation shaft 520 is provided in the measuring means 500, and the second rotation shaft 530 is provided in the mounting unit 130.

That is, in the prior art 1, when the second rotating shaft 530 rotates using the first magnet and the second magnet having the same polarity, the second magnet 531 connected to one end rotates and the second magnet 531 is made of the first magnet. The first magnet 521 is affected by the rotation and ultimately the second rotation axis 520 is a technology that rotates together.

However, the prior art 1 affects each other by the repulsive force because the first magnet and the second magnet have the same polarity, but there is no guarantee that the first rotational shaft will rotate the same as the rotational speed or the rotational speed of the second rotational shaft. When the speed of rotation of the blade is rapidly increased, when the acceleration force that is rotated is so large that it becomes larger than the magnetic force between the first magnet and the second magnet, the first magnet may not follow the rotation of the second magnet.

In particular, when used as a shipping meter when shipping a fluid such as petroleum, the blade (or rotor) that was stopped suddenly rotates at a high speed when the shipment starts. In addition, if a certain amount of oil is shipped and the shipment is stopped, the rotor will suddenly slow down and stop. Therefore, the prior art 1 has a problem that it is difficult to use when the change in the rotational speed is severe.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems as described above, and to provide an apparatus for measuring the rotational speed of a rotor of a flowmeter by connecting the rotary shaft of a general-purpose encoder to the measurement rotary shaft of a volumetric flowmeter.

Particularly, an object of the present invention is to provide a rotor rotation speed measuring device for a volumetric flowmeter, which separately constitutes a connecting shaft for directly connecting a general-purpose encoder to a measuring shaft, and separates and assembles a mounting plate of a flowmeter pipe and an adapter for supporting the encoder. To provide.

In order to achieve the above object, the present invention relates to a device for measuring the rotational speed of the rotor of the flowmeter by connecting the rotary shaft of the general-purpose encoder (hereinafter referred to as encoder rotary shaft) to the measurement rotary shaft of the volumetric flowmeter, wherein one end of the measuring rotary shaft is projected A base adapter coupled to a mounting plate outside the flowmeter pipe, the base adapter having two inner diameter surfaces having a first insertion hole formed in the center and having an inner diameter above the first insertion hole greater than an inner diameter of the lower portion; It has an outer diameter surface formed in two stages so as to fit in the first insertion hole of the base adapter, the second insertion hole is formed in the center and the inner diameter surface of the second stage is larger than the inner diameter of the lower end of the second insertion hole Encoder adapter; It has an outer diameter surface formed in two stages to be fitted into the second insertion hole of the encoder adapter, the upper end is formed with a first fitting groove to which one end of the encoder rotation shaft is fitted, the lower end is formed so that one end of the measurement rotation shaft is fitted It characterized in that it comprises a connecting shaft.

In addition, the present invention is a rotor rotation speed measuring device of a volumetric flow meter, the encoder includes a rotating shaft fixing portion formed between the body and the encoder rotating shaft protruding downward, the encoder adapter is the upper inner diameter surface of the second insertion hole The locking jaw is formed in, characterized in that the rotating shaft fixed portion of the encoder is over the locking jaw.

In addition, the present invention is characterized in that in the rotor rotation speed measuring device of the volumetric flow meter, the first fitting groove is formed in a circular shape in which one side is a straight line.

In addition, the present invention is a rotor rotation speed measuring device of a volumetric flow meter, the base adapter is characterized in that at least three or more fastening holes are formed on the outer periphery.

As described above, according to the rotor rotation speed measuring device of the volumetric flowmeter according to the present invention, it is possible to easily detachable to any volumetric flowmeter by using a general-purpose encoder, and the effect of accurately measuring the rotational speed of the rotor is obtained. Lose.

In addition, according to the rotor rotation speed measuring device of the volumetric flowmeter according to the present invention, by not using the gear connected to the conventional measurement shaft, the maintenance and maintenance work is simplified, thereby reducing the cost Lose.

Moreover, according to the rotor speed measuring device of the volumetric flowmeter according to the present invention, by replacing the measuring device of the rotor speed using a general-purpose encoder, it is possible to use an old mechanical flowmeter which is difficult to obtain the measuring device parts of the rotational speed as it is. Effect is obtained.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

In addition, in describing this invention, the same code | symbol is attached | subjected and the repeated description is abbreviate | omitted.

First, the configuration of a rotor rotation speed measuring device of a volumetric flowmeter according to an embodiment of the present invention will be described with reference to FIG. 3. 3A is an exploded perspective view of the rotation speed measuring device, and FIG. 3B is a front view of the rotation speed measuring device.

As shown in Figure 3, the rotor rotation speed measuring device of the volumetric flowmeter according to the present invention is composed of an encoder 10, a base adapter 20, an encoder adapter 30, a connecting shaft 40. In addition, it may be configured to further include a cover 50 for covering the encoder (10).

On the other hand, as shown in FIG. 3A, the rotor rotation speed measuring device is connected to the measurement rotation shaft 822 of the volume flow meter 820 to measure the rotation speed of the rotor of the flow meter. The mounting plate 821 is provided at the portion where the measurement rotation shaft 822 protrudes.

The encoder 10 is a kind of rotary encoder, and is an apparatus that outputs the rotation speed (or rotation position or rotation speed) of the rotating shaft as an electrical signal. The encoder 10 includes a rotation shaft 11 (hereinafter referred to as an encoder rotation shaft), and the encoder rotation shaft 11 protrudes downward of the encoder 10. Electrical signals generated from the encoder 10 are output to the outside through the wiring 14.

The encoder 10 may be a general purpose encoder. That is, preferably, a rotary encoder produced as one product is used.

As shown in FIG. 3B, the lower end of the connecting shaft 40 is fitted with the measuring rotary shaft 822 of the volumetric flow meter 820 and the upper end of the connecting shaft 40 is connected with the encoder rotating shaft 11.

The connecting shaft 40 is supported by being inserted into the insertion hole 31 provided in the center of the encoder adapter 30. In addition, the encoder adapter 30 also serves to support the encoder 10 so that the connection with the encoder rotation shaft 11 and the connecting shaft 40 is fixed.

The encoder adapter 30 is supported by being inserted into the insertion hole 21 provided in the center of the base adapter 20. In addition, the base adapter 20 is fastened to the mounting plate 821 of the volume flow meter 820. Therefore, the connecting shaft 40 is fixed by the encoder adapter 30 and the encoder adapter 30 is fixed to the base adapter 20, and the base adapter 20 is fastened to the mounting plate 821, thereby connecting the connecting shaft ( 40 is fixedly connected to the measurement rotation shaft 822 of the volumetric flow meter.

As shown in FIG. 4, the base adapter 20 is fastened to a mounting plate 821 outside the flowmeter pipe from which one end of the measurement rotation shaft 822 protrudes, and a first insertion hole 21 is formed in the center thereof. The inner diameter of the upper portion 23 of the first insertion hole 21 has an inner diameter surface 22 of two stages larger than the inner diameter of the lower portion 24.

In addition, at least three or more fastening holes 27 for fastening with the mounting plate 821 are formed at the outer circumference of the base adapter 20. Preferably four may be formed at intervals of 90 degrees. The fastening hole 27 is fastened to the mounting plate 821 by fastening means such as a screw screw.

The inner diameter surface 22 of the first insertion hole 21 of the base adapter 20 is formed so that the encoder adapter 40 is fitted. As shown in FIG. 5, the outer diameter surface 25 of the encoder adapter 30 is formed in two stages in which the outer diameter of the upper portion and the outer diameter of the lower portion are different, and the outer diameter of the upper portion is smaller than the outer diameter of the lower portion. That is, the inner diameter surface of the base adapter 20 and the outer diameter surface of the encoder adapter 30 are formed so that the encoder adapter 30 is fitted into the first insertion hole 21 of the base adapter.

The encoder adapter 30 has a second insertion hole 31 formed in the center thereof, and has an inner diameter surface 32 having two stages in which the inner diameter of the upper portion of the second insertion hole 33 is larger than the inner diameter of the lower portion 34. That is, the inner diameter surface 32 of the second insertion hole 31 of the encoder adapter 30 is formed so that the connecting shaft 40 is fitted.

As shown in FIG. 6A, the outer diameter surface 25 of the connecting shaft 40 is formed in two stages in which the outer diameter of the upper portion 42 and the outer diameter of the lower portion 43 are different, and the outer diameter of the upper portion 42 is the lower portion 43. It is smaller than the outer diameter of). That is, the inner shaft surface 32 of the encoder adapter 30 and the outer diameter surface 41 of the connecting shaft 40 are formed so that the connecting shaft 40 is fitted into the second insertion hole 31 of the encoder adapter. do.

As shown in FIG. 6B, a first fitting groove 44 into which one end of the encoder rotating shaft 11 of the encoder 10 is fitted is formed at the upper end of the connecting shaft 40. The shape of the first fitting groove 44 should be matched with the cross-sectional shape of one end of the encoder rotating shaft 11. That is, if the cross section of one end of the encoder rotating shaft 11 is a straight circular shape, the shape of the first fitting groove 44 is also a straight circular shape as shown in Fig. 6B.

On the other hand, the lower end of the connecting shaft 40 depends on the shape of the protruding portion of the measurement rotation shaft 822. When a rectangular fitting groove is formed at the end of the measurement rotation shaft 822, the lower end of the connecting shaft 40 is formed by cutting a predetermined length at the end so that the cross section becomes a rectangle. On the contrary, when one end of the measurement rotation shaft 822 has a square cross section and is cut by a predetermined length, the lower end portion of the connecting shaft 40 is formed with a fitting cross section of the square cross section.

In addition, at one end of the measurement axis of rotation 822 or at the lower end of the connecting shaft 40, a predetermined length cross section or fitting groove cross section at the end may be formed in a circular shape having one side straight. That is, it may be formed in the same shape as the first fitting groove 44 of Figure 6b.

On the other hand, the cover 50 is to cover the encoder 10, preferably, the end inner diameter surface of the lower end of the cover 50 is formed with a spiral groove to be coupled to the encoder adapter (30). A spiral groove that is engaged with the lower inner diameter surface of the cover 50 is also formed on the upper outer diameter surface of the encoder adapter 30.

In addition, the encoder 10 includes a rotating shaft fixing part 12 formed between the body and the encoder rotating shaft 11 protruding downward, and the encoder adapter 30 is connected to the upper inner diameter surface 33 of the second insertion hole. A locking jaw 38 is formed, and the rotating shaft fixing part 12 of the encoder is caught on the locking jaw 38.

As described above, the rotor rotation speed measuring device of the volumetric flow meter measures the rotor rotation speed by using the general-purpose encoder 10, and connects the encoder rotation shaft 11 and the measurement rotation shaft 822 of the flow meter to measure it. At this time, the component connecting the rotary shafts 11 and 822 is the connecting shaft 40. The encoder adapter 30 is fixed to the connecting shaft 40 to the encoder 10, and the base adapter 20 is to fix the encoder adapter 30 to the flowmeter 820.

As described above, the parts connecting the encoder rotation shaft 11 and the measurement rotation shaft 822 of the flowmeter are constituted by three components, so that the parts to be connected to each other can be manufactured to suit each shape.

The connecting shaft 40 may be separately manufactured to engage the upper and lower ends with the encoder rotating shaft 11 and the measuring rotating shaft 822 of the flowmeter, respectively. The diameter or shape of the cross section of the encoder rotation shaft 11 will be different for each general purpose encoder used, and the cross-sectional shape or cross section diameter of the end of the measurement rotation shaft 822 of the flowmeter will also be different.

As such, even if the end cross-sections of both the rotary shafts 11 and 822 are various, if only the connecting shaft 40 is manufactured to fit the cross-section, the encoder adapter 30 and the base adapter 20 may be used as they are.

In addition, the base adapter 20 is made to be fastened to the mounting plate 821 of the flow meter, the encoder adapter 30 is made to fit so that the encoder 10 can be fitted.

That is, the base adapter 20 suitable for each of the various types of wander systems are manufactured for each type, and the encoder adapter 30 for each type of a plurality of general purpose encoders is produced for each type. From the above adapters, simply select the type of adapter that is suitable for the encoder and flowmeter you want to combine.

Therefore, the rotor rotation speed measuring device according to the present invention is manufactured separately for each type of flow meter or encoder, and simply assembled as needed to obtain the effect of measuring the rotation speed (or rotation angle, rotation speed) of the rotor.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example, Of course, a various change is possible in the range which does not deviate from the summary.

The present invention is applicable to the development of an apparatus for measuring the rotational speed of a rotor of a volumetric flowmeter using a general-purpose encoder. In particular, it can be applied to develop a rotor flow measurement device of a volumetric flowmeter, which separately configures a connecting shaft connecting a general-purpose encoder directly to a measuring shaft, and separates and assembles a mounting plate of a flowmeter pipe and an adapter for supporting the encoder. Do.

1 is a view showing a conventional mechanical volumetric flow meter.

2 is a view showing a cross section of a conventional mechanical flow meter.

3 is an exploded perspective view and a cross-sectional view of a rotor speed measurement apparatus of a volumetric flow meter according to an embodiment of the present invention.

4 is a cross-sectional view of the base adapter according to an embodiment of the present invention.

5 is a cross-sectional view of an encoder adapter according to an embodiment of the present invention.

6 is a front view and a plan view of a connecting shaft according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: encoder 11: encoder rotation axis

12: rotating shaft fixing portion 14: wiring

20: base adapter 21: first insertion hole

22: inner diameter surface of the base adapter 23, 24: upper and lower inner diameter surface

25: outer surface of the base adapter 26: locking groove

27: fastening hole

30: encoder adapter 31: second insertion groove

32: inner diameter surface of encoder adapter 33, 34: upper and lower inner diameter surface

35: outer diameter surface of encoder adapter 36, 37: upper and lower outer diameter surfaces

38: jamming jaw

40: connecting shaft 41: outer surface of the connecting shaft

42, 43: upper and lower outer diameter surface 44: fitting groove

50: cover

Claims (4)

In the device for measuring the rotational speed of the rotor of the flowmeter by connecting the rotary shaft of the general-purpose encoder (hereinafter referred to as encoder rotary shaft) to the measurement rotary shaft of the volumetric flowmeter, A base adapter which is fastened to a mounting plate outside the flowmeter pipe where one end of the measuring rotation shaft protrudes, has a first insertion hole formed in the center thereof, and has an inner diameter surface of two stages in which the inner diameter of the upper portion of the first insertion hole is larger than the inner diameter of the lower portion. ; It has an outer diameter surface formed in two stages so as to fit in the first insertion hole of the base adapter, the second insertion hole is formed in the center and the inner diameter surface of the second stage is larger than the inner diameter of the lower end of the second insertion hole Encoder adapter; It has an outer diameter surface formed in two stages to be fitted into the second insertion hole of the encoder adapter, the upper end is formed with a first fitting groove to which one end of the encoder rotation shaft is fitted, the lower end is formed so that one end of the measurement rotation shaft is fitted Rotor speed measuring device of a volumetric flow meter comprising a connecting shaft. The method of claim 1, The encoder includes a rotating shaft fixing portion formed between the body and the encoder rotating shaft protruding downward, The encoder adapter has a locking step formed on the upper inner diameter surface of the second insertion hole, the rotational speed measuring device of the volumetric flowmeter, characterized in that the rotating shaft fixed portion of the encoder is over the locking step. The method of claim 1, The first fitting groove is a rotor rotation speed measuring device of a volumetric flow meter, characterized in that the one side is formed in a straight circular shape. The method of claim 1, wherein the base adapter, At least three fastening holes are formed on the outer periphery of the rotor rotation speed measuring device of a volumetric flow meter.

Images