JPS61126425A - Volumetric flowmeter - Google Patents

Abstract

PURPOSE:To improve reliability by incorporating a rotor member which is thread-cut double in the rotor chamber of a casing in an eccentric rotation state and fixing a stator member which is a single-thread spiral screw, and measuring a passing flow rate through eccentric rotation. CONSTITUTION:The cylindrical rotor chamber 3 is formed in the casing that a fluid passage penetrates, and the external cylindrical rotor member 4 in which a double-thread helical female screw is bored is incorporated so that the rotor member rotates on its own axis eccentrically and revolves around the axial line 6 of the casing. Then, large-diameter rolling flange parts 7 are formed at both ends of the rotor member 4, the stator member 10 whose outward appearance is the single-thread helical screw is arranged in the two-thread helical female screw 8, and both end fixed shafts 11 and fitted and fixed in shaft fixation part 12 extended into the casing 1. Consequently, the structure is simple and fluid is measured without any influence of the mixture of sand, etc.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to a casing in which an inner member having a single helical thread shape is fixed, and an outer member having a double helical thread bored therein is rotatably mounted. The present invention relates to a positive displacement flowmeter that measures a passing flow rate from the eccentric rotation of an outer -1 member by fluid.

(Prior art) Conventionally, so-called monoflow flow meters used for measuring the flow rate of high viscosity fluids (for example, Japanese Patent Laid-Open No. 57-8832
No. 3 is known.

This positive displacement flowmeter has a basic structure in which a rotor with a single thread is rotatably incorporated into a stator with a double thread female thread, and the space between the stator and rotor is By forcing pressurized fluid into the gap formed in the stator, the rotor is rotated eccentrically while being inscribed in the stator.
The passing flow rate is measured by detecting the eccentric rotation of the l-axis.

(Problems to be Solved by the Invention) However, in such conventional positive displacement flowmeters, the rotor is eccentrically rotated within the stator (revolutionary motion accompanied by rotation) by fluid force. Since the structure was to measure the flow rate from the eccentric rotation of the rotor, it was necessary to install a bearing structure in the fluid flow path that supported the rotor so that it could rotate freely, and the bearing was partially exposed to the fluid. Therefore, the structure must take into account corrosion caused by fluids and wear and tear caused by dust.Furthermore, in order to use universal joints and planetary gears that convert the eccentric rotation of the rotor into rotational movement around the stator axis, bearings must be The problem is that the parts are complicated and large, and the rotational resistance and noise of the rotor are also increased.

(Means for Solving the Problems) The present invention has been made in view of such conventional problems, and the bearing of the rotating part has a simple structure, is not exposed to fluid, and has high reliability and durability. The purpose of this is to provide a positive displacement flowmeter with excellent performance, and is configured as shown below.

That is, a cylindrical rotor chamber is formed in a casing through which a fluid passage is penetrated, and a rotor member having a cylindrical outer shape with a double-threaded helical screw is installed in the rotor chamber so as to be eccentrically rotatable. A stator member having a single helical thread shape inscribed in a double helical thread is fixedly installed on the casing side, and eccentric rotation of the stator member in the rotor chamber due to fluid is detected by a detection means such as a magnetic pickup. It is designed to measure and display the passing flow rate.

That is, the present invention achieves the above object by using a configuration opposite to the conventional structure in which the rotor member is fixed and the outer stator member is rotated.

(Example) FIG. 1 is a sectional view showing an embodiment of the present invention.

First, the structure will be described. Reference numeral 1 is a casing having a two-part structure with a fluid passage formed therein, and flanges 2 for connecting to piping are integrally formed on both sides of the casing 1. Inside the casing 1 there is a cylindrical [
A rotor member 4 having a cylindrical outer shape in which a 1-9 chamber 3 is formed and a double-thread internal thread 8 is bored inside the rotor chamber 3.
is eccentrically rotated, that is, when sliding contact with 1-axis 3, n-axis center 1
It rotates internally around 5 rotations and rotates around 6 around the casing axis. The rotor member 4 is formed with large-diameter shifting flange portions 7 at both ends in order to reduce the contact area with the inner circumferential wall of the rotor chamber 3 and enable smooth eccentric rotation.

Rotor member 4 built into rotor chamber 3 for eccentric rotation
A stator member 10 having the outer shape of a single helical screw is inscribed in a double-thread -I screw 8 bored in the casing 1. It is fitted and fixedly arranged in a shaft fixing part 12 extending inside.

A rotor member 4 having a double-thread internal thread 8 built into the rotor chamber 3 so as to be eccentrically rotatable, and a stator having an external shape of a single-thread helical thread inscribed and fixed in the rotor member 4. The basic structure of the flowmeter of the present invention is realized by the member 1O. That is, there is a gap CI between the eccentrically rotatable rotor member 4 and the fixed stator member 10.

If C2 and C3 are partitioned and pressurized fluid is supplied from the left side of the casing 1 as indicated by the arrow, for example, the outer rotor member 4 is connected to the rotor chamber 3 while the inner stator member 10 is fixedly arranged under fluid pressure. Since the volumes of the gaps C1, C2, and C3 are predetermined, the rotor member 4 causes eccentric rotation in accordance with the flow rate passing through the rotor member 4. Therefore, the eccentric rotation of the rotor member 4 is detected. By doing so, the passing flow rate can be measured.

Next, to explain the means for detecting the eccentric rotation of the rotor member 4 and displaying the measured flow rate, first, the rotor member 4 and the casing 1 are made of a non-magnetic material such as aluminum, and a magnet ring is attached to the outer periphery of the rotor member 4. The pickup coil 11 is installed in the upper part of the casing 1 facing the magnet 13, and the rotor member 4 is fixed as shown in the figure.
When 1! rotates eccentrically upward, a pulse-like voltage is induced in the pickup coil 14 due to a change in magnetic flux due to the proximity of the magnet ring 13. I try to do that.

The pulse voltage of the pickup coil 14 obtained by one eccentric rotation of the rotor member 4 is applied to a flow rate measurement circuit provided inside an indicator 15 installed at the upper part of the casing 1. Since there is a built-in counter that counts the voltage pulses from the rotor member 4 and the passing flow rate per eccentric rotation of the rotor member 4 is determined, the number of pulses per unit time is counted and this is multiplied by the passing flow rate (). By combining these values, the outflow display section 16 displays the passing flow rate numerically.

Next, the flow rate measurement operation according to the embodiment shown in FIG. 1 will be explained.

Now, if the pressurized fluid is supplied from the left side of the casing 1 as shown by the arrow, the pressurized fluid will be supplied to the rotor member 4.
A gap C on the inlet side formed between and the stator member 10
Since the inner stator member 4 is fixed, a rotational force is applied to the outer rotor member 10, and as a result, the outer rotor member 4
In the state inscribed in the rotor axis 5, the rotor starts to rotate around the axis 5, and starts eccentric rotation around the casing axis 6 to revolve around the casing axis 6.

Each of Figures 2.3.4 shows the eccentric rotation of the outer rotor member 4 relative to the fixedly installed inner stator member 10 when supplied with pressurized fluid.
FIG. 2 shows the initial state shown in FIG. 1, in which the rotor member 4 is eccentrically located upward with respect to the casing axis 6. When pressurized fluid is supplied from the left side in the state shown in FIG. 2, the rotor member 4 causes eccentric rotation in a predetermined direction determined by the threading direction of the double helical screw.
At a position after 90 revolutions from the state shown in Fig. 2, a gap C between the rotor member 4 and the stator member 10 is shown in Fig. 3.
When I, C2, and C3 move to the right toward the exit side and further revolve 180 degrees from the position shown in FIG. 2, the rotor member 4 shown in FIG. 4 becomes eccentric to the lower side of the casing axis 6. , a gap C between the rotor member 4 and the stator member 10
I.

C2 and C3 further move to the exit side. The fluid from the inlet side is transferred to the outlet side by the movement of the gap due to the eccentric rotation due to the fluid pressure of the outer rotor member 4 due to the internal contact with the stator member 10 fixed on the inside, and the volume of the gap is reduced. Since it is constant, it is possible to obtain eccentric rotation of the rotor member that is proportional to the passing flow rate.

A magnet ring 13 is fixed to the outside of the rotor member 4, and when the rotor member 4 eccentrically rotates to the upper side of the casing axis 6 as shown in FIG. magnet ring 1
3 is the closest, and a pulse-like voltage is induced in the pickup coil 14 due to the magnetic flux change due to the proximity of the magnet ring 13, and the pickup coil 111 generates one pulse voltage for each eccentric rotation of the rotor member 4, that is, for each revolution. Occur. The pulse voltage of the pickup coil 14 is displayed on the display 15.
1) The total volume of the air gaps CI, C2, and C3 (
The flow rate passing per unit time is calculated by multiplying the constants by the constants), and the calculated flow rate is numerically displayed on the flow rate display section 18.

Next, the operation of the embodiment shown in FIG. 1 will be explained in comparison with a conventional case in which the inner stator 10 is eccentrically rotatable and the outer rotor member 4 is fixed. Since the stator member 4 having a striped external thread shape is only fixedly arranged by the shaft fixing part 12,
This stator member 10 does not require a bearing structure at all, and since no bearing structure is provided in the flow path, there is no need to consider corrosion and durability of the bearing structure. Also,
The outer rotor member 4 is inscribed in the inner stator member 10 and can be eccentrically rotated in the evening sky 3 without requiring a special bearing structure by simply incorporating it into the casing 1 [1-Year chamber 3]. The structure is extremely simple.

In order to smooth the eccentric rotation of the rotor member 4 within the rotor chamber 3, it is desirable to select a material for the rotor member 4 to further reduce its weight.

In addition, since the rotor member 4 receives and receives force in the thrust direction due to fluid pressure, a ball bearing or the like is interposed on the end face of the rotor member 4 to prevent movement of the rotor member 4 from being hindered by the thrust force. It is desirable to do so.

Furthermore, in the embodiment shown in FIG. 1, the magnet ring 13 is directly fixed to the outside of the rotor member 4, and rotation is detected by the pickup coil 14 in accordance with changes in the eccentric position of the rotor member 4 with respect to the casing axis 6. However,
As another example, a plurality of magnet bars are embedded radially in the end surface of the rotor member 4 at predetermined intervals, and a pickup coil is provided opposite to the end surface where the magnet bars are embedded. may also be measured. Of course, it is also possible to extract only the orbital motion of the rotor member 4 during eccentric rotation, rotate the magnetic pole rotor, and measure the passing flow rate from the rotational speed of the magnetic pole rotor.

(Effects of the Invention) As described above, according to the present invention, a cylindrical rotor chamber is formed in a casing through which a fluid passage is penetrated, and a rotor having a cylindrical outer shape with a double-threaded helical screw inside the rotor chamber. The members are assembled eccentrically rotatably, and two of the rotor members
A stator member that is inscribed in the threaded helical thread and has the outer shape of a single threaded thread is fixedly installed in the casing, and the eccentric rotation of the rotor member in the 0-all chambers by supply of pressurized fluid is detected to detect the passing flow rate. Since it is a rotation of a helical rotor with a fluid passage inside, there is no need to provide a bearing structure in the fluid passage, and the outer rotor member is connected to the rotor chamber of the casing. No special support structure is required, just by incorporating it into the stator member, which is fixedly installed inside, it can receive pressurized fluid and cause eccentric rotation, and the eccentric rotation according to the passing flow rate can be caused. The structure for obtaining rotation is extremely simple,
Since the detection of the zero-evening rotation can also be carried out by cutting through the fluid passage passing through the interior, even when measuring fluid mixed with sand, dirt, etc., it will not be affected by the measured fluid.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and Section 2.3.
FIG. 4 is an explanatory diagram showing eccentric rotation of the rotor member due to fluid. 1: Casing 2: 7 Lunge portion 3: Rotor chamber 4: Rotor member 5: Rotor axis 6: Casing axis 7: Transfer 7 Lunge portion 8: Female thread 10: Stator member 11: Fixed shaft 12: Shaft fixing portion 13: Magnet ring 14: Pick-up coil 15: Display 18 Two flow rate display parts

Claims (1)

[Claims] A cylindrical rotor chamber is formed in a casing through which a fluid passage is penetrated, and a rotor member having a cylindrical outer shape with a double-thread internal thread is installed in the rotor chamber so as to be eccentrically rotatable. A stator member that is inscribed in the stator member and has the outer shape of a single helical thread is fixedly installed on the casing side, and the eccentric rotation of the rotor member within the rotor chamber due to the supply of pressurized fluid is detected to measure the passing flow rate. A positive displacement flowmeter characterized by being provided with a display means.