JPH0634651Y2 - Area type flow meter that can be used in any posture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an area type flow meter that can be applied in any direction of fluid flow, that is, can be installed and used in any posture.

(Prior Art) A conventional float type area type flow meter has a float (pressure receiving plate) which freely moves up and down in a vertical taper pipe 9 as shown in FIG.
When 1 is provided and the fluid is made to flow in from below, the flow is throttled by the float 1 and a differential pressure is generated before and after it, so that the float 1 receives an upward force due to this differential pressure and ascends to rise in the fluid of the float. Stand still at a position that balances the effective weight.

Since the flow area of the fluid is proportional to the flow rate, the flow rate can be measured by detecting the stationary position of the float.

Also, as shown in Japanese Utility Model Publication No. 52-110866, a magnetic pressure receiving plate (float) and a spring are fitted in the taper pipe to hold the magnetic pressure receiving plate in a restorable manner, and a magnetic indicator ring is inserted in the taper pipe. A magnetic tracking type indicator having a scale plate on the outside thereof is also known.

However, in the conventional area type flow meter, since the inner wall surface of the taper pipe 9 is linear in the axial direction, the moving distance from the minimum value on the float 1 and the scale plate 2 with respect to the flow rate increase / decrease has a relationship with the flow rate increase / decrease. There is no linear relationship.

Therefore, the scale of the area type flow meter cannot be evenly scaled. As a solution to this problem, there is a flowmeter in which the inner diameter of the tapered pipe is changed in the axial direction according to a predetermined mathematical formula, that is, the inner wall surface is not a conical surface but a curved surface.
It is proposed in Japanese Patent Laid-Open No. 031 and Japanese Patent Laid-Open No. 63-75520.

(Problems to be solved by the invention) By the way, the area type flow meter is originally installed vertically and flows the fluid from the lower side to the upper side so as to balance with the weight of the float and perform the measurement. If the fluid is used in a flow direction different from that of the standard mounting state (for example, when the fluid is mounted obliquely), a deviation occurs between the actual flow rate and the value indicated by the flow rate indicator 8. Even if this deviation is mechanically adjusted to zero, it is an unequal scale, so even if only one point in the entire scale range is adjusted, the other scales are not corrected. Cannot be used as is. Even in the flowmeter of the type described in Japanese Utility Model Laid-Open No. 52-110866 in which the float is pressed by the spring, the influence of the weight of the float cannot be ignored at all, so the scale must be changed by changing the mounting posture.

An object of the present invention is to solve such a problem and to provide an area type flow meter which can be used even if the flow direction of the fluid is changed without recalibrating and replacing the scale.

(Means for Solving the Problems) The present invention is to solve the above problems, and in an area type flow meter, a float (pressure receiving plate) 1 and the above-mentioned in a tapered pipe 9 whose inner wall surface is a curved surface in the axial direction. A spring 12 for pushing the float to the fluid inlet side is inserted, and a scale plate 2 with a uniform scale is provided through a scale moving mechanism capable of moving to a position corresponding to the flow rate measurement value at a position where the flowmeter is inclined from the vertical direction. The area type flow meter can be used in any posture.

Here, the float 1 has a built-in magnet, and the flow rate indicator 8 made of an annular magnet is inserted outside the tapered tube 9. Furthermore, the alarm signal generator 4 that generates an alarm signal in response to the magnet of the flow rate indicator 8 is
It is provided via an alarm signal generator moving mechanism that enables movement in the axial direction. The alarm signal generator moving mechanism is provided in an elongated hole 15 provided on one side surface of the housing. It is also characterized in that it is fitted and moved, and is fixed at the flow rate position to be alarmed.

(Operation) The area type flow meter with uniform scale of the present invention does not specify the direction of fluid flow, and can be used in any direction of fluid flow.

The uniform scale was realized by inputting the function that added the correction term obtained from the experiment to the theoretical formula to the numerical control lathe and processing the inner wall surface of the taper pipe to the curved surface by this numerical control lathe.

Furthermore, by applying a force to the float (pressure receiving plate) to the float (pressure receiving plate) in the opposite direction to the direction in which the moving direction of the float (pressure receiving plate) shows an increase in the flow rate, by applying the former to the flow of fluid in all directions. Can be used in any direction.

Since the flow meter of the present invention pushes the float toward the fluid inlet side by the spring, the deviation of the scale due to the mounting posture is less than that of a general area flow meter that balances the flow of the fluid only by the weight of the float. . However, since the influence of the weight of the float cannot be completely eliminated, it is necessary to change the scale according to the mounting posture, and if the scale is the same as in the vertical posture, the error increases and it cannot be put to practical use.

If an area type flow meter with even scales is set upright and the fluid is flowed from below to above (hereinafter referred to as standard installation state) and used in the direction of fluid flow in a different direction, the actual flow rate There is a gap between the flow rate indicator 8 and
If the scale plate 2 supported by the long hole 19 is moved in the axial direction of the taper tube 9 to eliminate this deviation, that is, since it is a uniform scale, it is necessary to adjust only one arbitrary point in the entire scale range to obtain another scale. Since all have been adjusted, the results of the scale calibration test in the standard installation state can be used as they are.

This is because the deviation of the indicated value of the flow meter due to the change of the mounting posture of the flow meter does not appear in the change of the scale interval if the uniform scale is adopted, and the rule is found that it is only the parallel movement of the scale with the same interval. It has become possible. Therefore, by realizing a uniform scale, the flowmeter can be applied in all directions of the fluid, and even if the flowmeter cannot be mounted vertically due to restrictions on the mounting location, it is possible to easily provide a flowmeter that can be used. Note that the scale moving mechanism is not limited to the one using the elongated holes described above, and it is natural that a slide mechanism such as a slide rule can be used.

When a flow meter with an uneven scale is adjusted in the standard installation state and the flow meter is installed in a different orientation from the standard installation state, a deviation occurs between the actual flow rate and the index value of the flow rate indicator, but this deviation Even if it is adjusted so that it is zero, the scale is unequal, so even if only one arbitrary point in the entire scale range is adjusted, the other scales are not adjusted.Therefore, the error in this case is the error in the standard mounting state. The error in this case cannot be estimated from the error in the standard mounting condition.

The area type flow meter of the present invention can measure the flow rate by directly looking at the position of the float by using a transparent taper pipe, but it is limited to plastic pipes because it cuts the inner wall surface into a curved surface, making it transparent In order to do this, it is necessary to polish the cut surface sufficiently. If you want to save the labor of polishing, measure an opaque fluid, or use a metal tube due to insufficient strength of a plastic tube to measure a high-pressure fluid, use a magnet with a built-in float. Good to use. With this, the position of the float can be known by inserting a flow rate indicator made of an annular magnet outside the tapered tube so as to move following the float.

Further, an alarm signal can be obtained at an arbitrary flow rate by providing an alarm signal generating device that reacts with the magnet of the flow rate indicator and generates an alarm signal so as to be movable in the axial direction along the taper tube.
The alarm signal generator moving mechanism for this purpose, for example, as shown in the embodiment later, is provided with a long hole in one side surface of the housing accommodating the flow meter so that it can be moved by being fitted therein.
It suffices if it is clamped and fixed at a predetermined flow rate position to be alarmed.

Further, the flowmeter with even scales is housed in a rectangular hexahedron housing 14, one of the four side surfaces is attached with a uniform scale plate 2 and the long groove 15 is cut into the other three surfaces. By making it possible to install the alarm device 4 on the surface, the degree of freedom in mounting the alarm device 4 is significantly improved even when the place where the flow meter is installed is narrow and the surrounding space is limited.

(Example) An example will be described with reference to the drawings.

In FIGS. 1 to 6, reference numeral 1 denotes a float (pressure receiving plate) having a built-in magnet. This float moves in the tapered tube of 9 against the spring 12 against the flow of fluid (eg upward from below). The inner wall surface of the tapered tube 9 is a curved surface in the axial direction. Scales are evenly added to the scale plate 2. Reference numeral 8 denotes a flow rate indicator of a magnetic material, which can move in conjunction with the float 1. Reference numeral 4 is an alarm device, which can be easily inserted into and removed from the annular pointer 3 through one long groove 15 of the housing 14. Further, the large knob 6 can be fixed to the housing 14 by screwing.
Since the alarm device 4 has a built-in sensor that reacts to the flow rate indicator 8, the alarm is issued at a certain fixed point when the float 1 moves.

The scale plate 2 is attached to one of the four side surfaces of the housing 14, but since the scale plate 2 is fixed by an elongated hole, it is easy to adjust the reference point of the scale when the mounting position of the main body changes. Can be done.

Since the alarm device 4 can be attached to any of the three side surfaces other than the mounting surface of the scale plate 2, the alarm signal can be taken out at any position.

The taper tube 9 is made of metal or ceramic so that high temperature and high pressure fluid, corrosive fluid and opaque fluid can be measured.

When a flowmeter with an alarm device is installed in the piping system, the alarm device 4 will be activated due to the natural vibration of the piping system and the vibration coming from the outside.
The tightening mechanism may loosen, the alarm device 4 may move, and the alarm set value may fluctuate.

The present invention relates to the inside surface 17 of the alarm device connected to the housing 14 of the flow meter.
Even if the alarm device is fixed to the flow meter by attaching a cushioning material such as the O-ring 7 to the, the set position of the alarm device is not displaced due to vibration or the like.

Even if the large knob 6 is tightened on the housing 14, the cushioning material prevents the inner surface 17 from being damaged by the tightening of the large knob 6.

Further, by making the contact portion of the protective tube 10 with the housing 14 airtight by the packing 11 or the like, it is possible to prevent dust from entering the space where the flow rate indicator 8 can move even in an environment of bad environment where dust and the like frequently occur. There is no obstruction that hinders the movement of the, and a clear indication of the flow rate is always obtained.

(Effect of the Invention) As described above, the area flow meter having the uniform scale does not specify the flow direction of the fluid, and can be easily used in the flow direction of the fluid in all directions.

If a flow meter adjusted in the standard mounting state is used in the flow direction of the fluid in a direction different from this, a deviation occurs from the actual flow rate, and this deviation moves the uniform scale plate 2 in the axial direction of the pipe 9. It can be zero by that. That is, since the scale is a uniform scale, all the other scales can be adjusted by adjusting only one arbitrary point in the entire scale range, so that the flow meter can use the result of the scale calibration test in the standard mounting state regardless of the mounting position.

Even if the area flowmeter with a uniform scale is installed in a place where the fluid flow direction is different, the calibration test results in the standard installation state are corrected by moving the scale plate each time to correct only one point. Since it can be used as it is, the flow meter can be easily used in the fluid flow directions of all directions.

An area flow meter with a uniform scale does not need to manufacture a dedicated flow meter for each direction of fluid flow, and does not need to carry out a scale calibration test for each direction of fluid flow, thus shortening the manufacturing process. In addition, the inspection process can be shortened and the manufacturing cost can be reduced.

When installing the flowmeter in the piping system, it is possible to install the same type of flowmeter in any fluid flow direction, so it is easy to carry out on-site construction and the construction period can be shortened. Can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of the present invention, and FIG. 2 is the same as AA, BB.
Sectional view, FIG. 3 is a partial perspective view of the present invention, FIG. 4 is a perspective view of an alarm device, FIG. 5 is a perspective view of a scale plate, and FIG. 6 (A) is a vertical sectional view of a taper pipe of the present invention. , B is a vertical cross-sectional view of a conventional taper tube, and FIG. 7 is a schematic view of a conventional area flow meter. 1 …… Float (pressure receiving plate) 2 …… Uniform scale plate 3 …… Alarm ring for alarm 4 …… Alarm device 5 …… Small knob 6 …… Large knob 7 …… O-ring 8 …… Flow rate indicator 9 ... … Taper tube 10 …… Protection tube 11 …… Packing 12 …… Spring 13 …… Negative part 14 …… Case 15 …… Long groove 16 …… Alarm tip 17 …… Inside of alarm device 18 …… Scale plate mounting Frame 19 ... Oval hole

Claims (4)

[Scope of utility model registration request] 1. In an area type flow meter, a float (pressure receiving plate) is provided in a taper pipe (9) whose inner wall surface is curved in the axial direction.
(1) and the spring (12) that pushes the float toward the fluid inlet side are inserted, and the scale plate (2) with uniform scale moves to the position corresponding to the flow rate measurement value at the position where the flowmeter is inclined from the vertical direction. An area type flow meter that can be used in any posture, characterized in that it is provided via a possible scale moving mechanism. 2. The float (1) has a built-in magnet, and the taper tube (9) has a flow rate indicator (8) made of an annular magnet inserted outside the taper tube (9). Area type flow meter that can be used in any posture. 3. An alarm signal generator (4) for generating an alarm signal in response to a magnet of a flow rate indicator (8) is provided via an alarm signal generator moving mechanism which enables axial movement. The area type flow meter which can be used in any posture according to claim 2. 4. The alarm signal generator moving mechanism is moved by inserting the alarm signal generator (4) into an elongated hole (15) provided on one side surface of the housing, and is fixed at a flow rate position to be alarmed. An area type flow meter that can be used in any posture according to claim 3, characterized in that it is a thing.