JP2002039817A - Flowmeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate operation confirmation by visual observation. SOLUTION: This flowmeter is equipped with a turbine 4 rotated by the flow of the target fluid or a movable member to which the rotation of the turbine is transmitted. A colored pattern 24 classified by at least two colors or a pattern of a non-straight line in the motion direction of a curve or the like are alternately classified by color or patterned in the turbine or in the position observable from the outside of the movable member and in the motion direction of rotation or reciprocation. When the turbine 4 is driven, the colored pattern 24 or the non-straight line pattern looks like moving, one color, or no pattern, and when stopped, the pattern can clearly be confirmed. Thereby, the motion of the turbine 4 can easily be confirmed by visual observation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flow meter. More specifically, the present invention relates to a flowmeter including a turbine rotating with the flow of a fluid to be measured or a movable member to which rotation from the turbine is transmitted (hereinafter, these are collectively referred to as a turbine or the like). The present invention relates to an improvement in a structure that allows a user to visually confirm a rotation operation.

[0002]

2. Description of the Related Art In recent years, flow meters have been used in ordinary households. For example, in a household water purifier, the replacement time of a filter cartridge is notified based on an integrated flow rate.

[0003] As such a flowmeter, there is a flowmeter having a simple structure in which the rotation of a turbine rotating with the flow of water is reduced by, for example, a gear train and displayed as the movement of an indicator at the last stage. In the flow meter having such a structure, since the displayed integrated flow rate, in other words, the replacement time of the filter is a long time of several months or more, the indicator does not move visibly, and the indicator does not actually move. It is impossible to know whether or not the measurement is performed by rotating the gas turbine, or whether the operation of the turbine or the like is stopped due to clogging or the like, and the measurement is impossible.

Therefore, in order to increase the reliability of the display of the filter replacement time, it is desirable to be able to determine whether the turbine or the like is actually rotating.

Conventionally, an operation check to determine whether or not the flow meter is actually moving is carried out by equipping a turbine or the like with a magnet or a coil, and detecting a change in magnetic flux that changes with rotation, a power generation amount, and the like. Done.

[0006]

However, the operation confirmation method using the magnetic force, the amount of power generation, and the like in an application in which the water purifier and thus the flowmeter itself are desired to be miniaturized, such as when used in a household water purifier, is not known. However, the structure is complicated and large, resulting in an increase in cost. Further, if the turbine or the like is not exposed, the operation of the turbine or the like cannot be visually confirmed. Even if the casing covering the turbine etc. is transparent, especially when the flow meter is small, especially in the case of a flow meter provided in a household water purifier, the turbine etc. are inevitably reduced in size and are integrally molded with resin etc. Since the turbine blades and the shafts around them have the same color, it is not easy to visually distinguish the blades and shafts of the turbine and the like seen through the casing from each other and to distinguish each blade. Not
It is difficult to visually observe whether they are rotating.

Accordingly, an object of the present invention is to provide a flow meter that facilitates visual confirmation of operation.

[0008]

In order to achieve the above object, the invention according to claim 1 is directed to a flow rate having a turbine rotating with the flow of a fluid to be measured or a movable member to which rotation from the turbine is transmitted. In the meter, at a position observable from the outside of the turbine or the movable member, and in a movement direction such as rotation or reciprocation, a color-coded pattern of at least two colors or a non-linear pattern in a movement direction such as a curve (hereinafter referred to as a non-linear pattern). ) Are alternately colored or patterned.

According to this flow meter, when the turbine or the movable member is stopped, the color-coded pattern or the non-linear pattern can be clearly visually recognized. Also, when in a motion state such as rotation or reciprocating motion, even at a low speed, it is visually recognized as a change in a color-coded pattern or a non-linear pattern. Looks like. Therefore, if the color-coded pattern or the non-linear pattern appears to stop without any apparent change, the turbine is in a stopped state, and if the color-coded pattern or the non-linear pattern changes slowly or looks like one color or no pattern, the turbine is stopped. It can be determined that the rotating operation is being performed. In addition, since this visual identification is based on simple recognition of a color-coded pattern or the like, it is possible to easily confirm without paying special attention.

In this flowmeter, a color-coded pattern or a non-linear pattern in the direction of movement is provided, or an identification member formed between the flowmeter and another member is mounted on the turbine or the movable member. It can be provided to rotate integrally. In this case, a color-coded pattern or a non-linear pattern can be formed on the turbine or the like simply by assembling the color-coded identification members, so that the pattern can be formed more easily than when a pattern or the like is directly provided on the turbine.

Further, the color-coded pattern or the non-linear pattern of the turbine is provided on the peripheral surface of the rotating shaft, and an identification member colored in a different hue from that of the turbine blade is provided on the turbine blade. It can also be formed by placing it between and providing it so that it can be seen alternately with the turbine blades. In this case, the identification member and the turbine blade have different hues, and it is easy to visually confirm the determination of the stop and the rotation operation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on the best mode shown in the drawings.

FIG. 17 shows an example of an embodiment of the flow meter according to the present invention in which the operation status of a turbine or the like can be visually confirmed. The flow meter 1 transmits the rotation of the turbine 4 rotating with the flow of the fluid to the indicator 19 via a reduction mechanism including the internal gear planetary gear train 10, and the rotation causes the scale member 34 of the scale display unit 31 to communicate with the indicator 19. The display indicates that the total flow rate, which is a measure of filter replacement, has been filtered.

The flow meter 1 is mainly composed of a measuring section composed of a housing 2, a support shaft 3, a turbine 4 and a speed reduction mechanism 5, and a scale display device 31.

The scale display device 31 is composed of a scale member 34 for reading the displacement of the indicator 19 of the measuring unit housed in the casing 2 having a sealed structure as a filter replacement time and a transparent dial 35 for housing the scale member 34. The display can be reset by rotating the dial 35 together with the scale member 34.

As shown in FIG. 19, the dial 35 has a cap shape, and a flange 35b which is divided in the circumferential direction by four notches 32a formed at four positions formed at intervals of 90 degrees. By hooking and holding the four parallelogram-shaped claws 32b on the side,
It is rotatably attached to the casing 2. The claw 32b of the casing 2 can pass only by obliquely moving the notch 32a of the flange 35b in parallel with the notch 32b, and by passing through the flange 35b and engaging with the fine unevenness 35c on the upper surface of the flange 35b. The dial 35 is hooked on the casing 2 and is provided so as not to rotate freely due to the engagement between the projection 32c of the claw 32b and the unevenness 35c. A biasing force always acts between the casing 2 and the dial 35 by the coil spring 33 housed in the annular groove 37, and the engagement state between the dial 35 and the casing 2 is maintained.

The dial 35 has a start position 1
A scale member 34 made of, for example, a white paper circular sheet having a scale 38 consisting of three triangular holes 38a and four round holes 38b indicating a progress state is stored and held, and each hole 38a, The position of the indicator 19 of the measuring section is viewed from outside through 38b. The dial 35 has a groove 36 at the center of the top plate 35a.
The dial 35 can be rotated in any direction by inserting a coin or the like and pushing the spring 33 so as to crush the spring 33 to release the engagement between the projections and depressions 35c and the projections 32c. In addition, a deformed portion 34 a for identifying the front and back of the scale member 34 is formed at one position on the outer peripheral edge.

The support shaft 3 is accommodated in a space 6 in the housing 2. This support shaft 3 is arranged in the center of the space 6,
It is fixed to the bottom wall 2 a of the housing 2. This spindle 3
, A turbine 4 is rotatably mounted. An eccentric boss 8 is integrally formed on a surface of the turbine 4 on the side of the speed reduction mechanism 5 so as to protrude. The center of the eccentric boss 8 is, as shown in FIG.
Is eccentric by the distance e with respect to the center of. The eccentric boss 8 of the turbine 4 is provided with a hollow portion in order to eliminate the displacement of the center of gravity due to the provision of the eccentric boss 8. The eccentric boss 8 is rotatably fitted to the hole 11a of the internal gear 11 of the internal gear planetary gear train 10 at the first stage of the reduction mechanism 5 arranged coaxially with the turbine 4 by the support shaft 3. Connected.

A turbine 4 is arranged in the fluid passage 7 in the housing 2. Therefore, the inflow port 7
The turbine 4 is rotated by the fluid flowing from the inlet port a to the outlet port 7b.

The speed reduction mechanism 5 includes a plurality of internal gear planetary gear trains 1.
0 are sequentially stacked. The reduction mechanism 5 of this embodiment includes, for example, six-stage internal gear planetary gear trains 10,... Each of the internal gear planetary gear trains 10 includes an internal gear 11, a sun gear 12, and an eccentric boss 13. The eccentric boss 13 provided on the sun gear 12 is inserted into a hole 11a of the lower internal gear 11 on the rotation transmission. They are sequentially connected by fitting.

The internal gear 11 has a plurality of projections 14 on the outer peripheral surface which are caught in a plurality of recesses 15 on the inner surface of the housing 2 only in the circumferential direction.
It is possible to make a circular movement around and to be unable to rotate.

The sun gear 12 is arranged inside the internal gear 11 and meshes with the gear portion 11b. The eccentric boss 13 of the sun gear 12 is formed so as to protrude from a surface of the next stage on the side of the internal gear planetary gear train 10. This eccentric boss 13
Is eccentric with respect to the center of the sun gear 12, that is, the support shaft 3 by a distance e, similarly to the eccentric boss 8 formed in the turbine 4. The eccentric boss 13 is formed in the center hole 11 of the internal gear 11 constituting the internal gear planetary gear train 10 of the next stage.
and are rotatably connected to each other.
Therefore, the eccentric boss 13 and the internal gear 11 of the next stage integrally perform a circular motion.

The eccentric boss 8 of the turbine 4 is fitted and connected into the hole 11a of the internal gear 11 constituting the first-stage internal gear planetary gear train 10. Therefore, the first stage internal gear 11 and the turbine 4
The eccentric boss 8 performs a circular motion integrally.

An indicator 19, which is colored in a conspicuous color such as red, is attached to the last stage sun gear 12. The indicator 19 is, for example, a semicircular plate, and two claw pieces 19a are formed on the bottom surface thereof. These claw pieces 19 a are inserted into the holes 12 of the sun gear 12.
a, the indicator 19 is moved to the sun gear 12
And rotate together. That is, the rotational displacement of the indicator 19 is proportional to the flow rate of the fluid to be measured. Therefore, the rotation reduced by the internal gear planetary gear train 10 of each stage is transmitted from the sun gear 12 of the last stage to the indicator 19 to rotate it. Since one rotation of the turbine 4 corresponds to a predetermined flow rate in the fluid passage 7, the amount of rotational displacement of the indicator 19 is proportional to the integrated flow rate in the fluid passage 7.

Here, at a position observable from the outside of the turbine 4 or the movable member to which rotation from the turbine 4 is transmitted, a color-coded pattern 24 or a curve or the like consisting of at least two colors in the direction of movement such as rotation or reciprocation. A non-linear pattern (non-linear pattern) 24 'in the movement direction is alternately color-coded or displayed in the rotation direction or the movement direction so that the stop and operation of the turbine 4 and the like can be visually confirmed easily. It is configured.

The embodiment shown in FIGS.
Is provided with a color-coded pattern 24 or a non-linear pattern 24 ′ on the peripheral surface of the rotating shaft 22. Here, the color-coded pattern 24
Is a two-color ring in which, as shown in, for example, FIGS. 1 and 2, each area divided by a line (generating line) parallel to the rotation axis 22 is sequentially colored with different colors. However, the widths of the divided areas need not all be uniform. Also,
As shown in FIG. 4, the colored regions 24a and 24b may be further divided in the axial direction so that different colors appear alternately in front and rear, right and left in a checkered pattern. The colors constituting these color-coded patterns are preferably chromatic colors that are complementary colors, but may include white, black, and gray achromatic colors in some cases. Of course, it is desirable that the color used for the color-coded pattern be different from the color of the turbine 4 or the movable member that rotates or reciprocates upon receiving rotation from the turbine 4. Each of them becomes difficult to recognize as a pattern when rotated, and as the rotation increases, it looks like a single color or no pattern as shown in FIG. 3 due to an afterimage phenomenon.

The non-linear pattern 24 ′ may be a continuous curve or a polygonal line that bends in the direction of movement, for example, a rotational direction, a polygonal curve such as a ∧ or ∧ that is displayed intermittently, a simple horizontal line, an oblique line,
This includes all lines, figures, symbols, patterns, etc., except lines and figures consisting only of straight lines extending in the rotation direction, such as circles and other figures. In addition, the non-linear pattern 24 'may be formed of a line or a band of a color different from the color of the member to be displayed, or at least two different colors (one color in this case may be displayed). May be displayed by making the boundary of a non-linear shape. For example, as shown in FIG.
Or as a curved pattern consisting of bands of different colors,
As shown in (B), the boundary between the two color surfaces can be formed by making the boundary a non-linear shape such as a wave shape. Such a non-linear pattern is also difficult to recognize as a pattern when the turbine 4 rotates, and appears as a single color or no pattern due to an afterimage phenomenon in a range where the pattern is added as the rotation increases.

Such a color-coded pattern 24 and a non-linear pattern 2
4 ′ may be directly patterned on the peripheral surface of the rotating shaft 22 of the turbine 4, or a color-coded identification member such as a seal member with a printed pattern may be attached to the peripheral surface of the rotating shaft 22, As shown in FIG. 5, a ring-shaped identification member 28 may be formed and fitted to the rotating shaft 22. In addition, for example, as shown in FIG. 6, one or a plurality of rotating shafts 22 provided with notches 21 at regular intervals are fitted with a ring-shaped identification member 20 having a different color from the rotating shaft 22 of the turbine 4. May be patterned. After all, it suffices that these members are provided so that the members that are alternately colored in the rotation direction are integrally rotated with the turbine 4, or that the members on the rotating shaft 22 are colored with the ground color. In the case where the identification member 20 is fitted, there is an advantage in that the identification member 20 is simple because it can be color-coded with the ground color without fine color-coding.

Here, when the rotary shaft 22 of the turbine 4 is provided with, for example, a color-coded pattern 24 as shown in FIG. 7, the actual pattern viewed from the side is the turbine blade 23 as shown in FIG. It will be visible from between. When the turbine 4 rotates, as shown in FIG. 8 (B), the rotating shaft 22 and the turbine blade 23 become visible separately, and the appearance of the rotating shaft 22 is changed. You can easily determine whether you are doing.

The case where the peripheral surface of the rotary shaft 22 of the turbine 4 is color-coded has been described so far. However, the color-coded pattern 24 for making it possible to easily confirm the stop and operation.
The form of the non-linear pattern 24 'is not limited to this. For example, as shown in FIG. 9, the rotating shaft 22 and the turbine blades 23 are colored differently, and when stopped, it looks like two colors as shown in FIG.
The rotation shaft 22 and the turbine blade 23 can be made to look like one color (or no pattern) due to the afterimage phenomenon like 0 (B). In this way, the identification member 29 formed separately from the rotating shaft 22 or the turbine 4 and colored with a different hue from the turbine blade 23
It is possible to use it for easy operation confirmation by providing it so that it looks alternately. In the case where the number of blades of the turbine 4 is large and densely arranged, it can be determined by coloring every other blade in a different color or by attaching such an identification member. It is.

Further, in this case, as shown in FIG. 13, the turbine half 23a having the rotary shaft 22 integrally formed is separated from the turbine half 4a having the turbine blade 23 integrally formed by injection molding or the like. And the halves 4a and 4b may be combined with each other to have different hues. In this case, the rotating shaft 22 functions as an identification member colored in a different hue from the turbine blade 23. In addition, if such separate members are used, it is only necessary to change the color of the material, and there is no need to color only the turbine blade 23 (or the rotating shaft 22) to another color. Here, when this turbine 4 is viewed from the side, FIG.
(A), and during rotation, as shown in FIG. 14 (B). In addition, the turbine half 4 provided with the rotating shaft 22
b may be one that rotates integrally with the turbine half 4a having the turbine blades 23 or a stationary one that does not rotate.

Further, the end face of the rotating shaft 22 can be color-coded so that the determination of the stop and the operation can be confirmed. For example, the turbine 4 shown in FIG.
The end face of No.2 is divided into two colors after being divided into four equal parts, and when rotated, as shown in FIG. 11 (B), it looks like one color (or no pattern). Therefore, in this case, the operation of the turbine 4 is checked when viewed from the axial direction. To color the end face of the rotating shaft 22, FIG.
This may be performed by attaching a disk-shaped colored molded member 20 as shown in FIG. In this case, as shown in FIG. 12, only a portion colored differently from the rotating shaft 22 is separately molded into a butterfly shape or the like, and fitted into a groove of the same shape provided on the end face, so that the circumferential direction can be improved. There is no gap.

As described above, the flowmeter 1 of this embodiment in which the turbine 4 is provided with the color-coded pattern 24 or the non-linear pattern 24 'so that the distinction between the stop and the operation can be easily confirmed is shown in FIG. 21, for example. As described above, it is preferable to be incorporated in the household water purifier 40 or directly incorporated in the filter cartridge itself, and used as a display means for indicating the replacement time of the filter. In this type of water purifier 40, the replacement time of the filter is determined based on the amount of filtered tap water. That is, the measuring device 1 is attached to a household water purifier or a water purifier filter cartridge, and is used to measure an integrated flow rate after water purification. In addition, the operation status of the flow meter 1 can be easily confirmed even when incorporated in the water purifier. For example, as shown in FIG. 15, when the interior can be viewed from the direction indicated by the arrow in the figure through the viewing window 25 provided in the case 26, patterns that are alternately color-coded in the rotation direction of the turbine 4 can be seen in a color-coded state. The stop and the operation can be easily discriminated visually depending on whether the image looks one color due to the afterimage phenomenon. Here, the viewing window 25 is formed by using an acrylic plate or the like, and the interior is more easily recognized by having a lighting function. In addition, as shown in FIG. 21, the viewing window 25 is provided at a position slightly above the center of the front side that naturally enters the range of the line of sight of the person using the water purifier 40, but is not particularly limited to this. Not something.

When the operation can be confirmed from the viewing window 25, it is sufficient that the colored molded portion is provided in a necessary and sufficient range. For example, as shown in FIG. 15, when one of the colored portions is the turbine blade 23 and the other is the rotating shaft 22, the identification member 29 or the rotating shaft 22 that is colored in a different hue from the turbine blade 23 has a circumferential shape. Whereas, as shown in FIG. 16, when the identification member 29 colored in a different hue from the turbine blade 23 is fixed as shown in FIG. 16, a part (for example, It is sufficient if an arc portion is provided.

As described above, the rotation of the turbine 4 is controlled by the viewing window 25.
The user can confirm that the flow meter 41 is functioning normally. Therefore, it is possible to replace the filter cartridge while relying on the display of the indicator 19 indicating that it is time to replace the filter cartridge. After the cartridge is replaced, the scale is reset by inserting a coin or the like into the groove 36 and rotating the dial 35 in one direction, so that the integrated flow rate until the next filter cartridge replacement time can be accurately determined. Can be weighed.

The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

For example, in the present embodiment, a case has been described in which the turbine 4 of the flowmeter 1 is provided with a color-coded pattern 24 of at least two colors or a non-linear pattern 24 'such as a curve, but the patterns 24, 24' are provided. Is not limited to the turbine 4. For example, when the rotational operation of the turbine 4 is transmitted to a measuring unit or the like as shown in FIG. 17, an operating speed suitable for the visual recognition operation is a movable member such as the reduction mechanism 5 or the indicator 19 that rotates in the measuring unit. It is also possible to confirm the operation using a device having

Further, in the present embodiment, a rotating body such as the turbine 4 of the flow meter 1 is identified, but the object of the present invention is not limited to the rotating body. For example,
When the object is reciprocating or the like, the pattern can be seen as it is at the time of a stop, while it looks one color or no pattern due to the afterimage of the eyes if it moves at a high speed. Therefore, the present invention can be applied to such a case.

In addition, in each of the above embodiments, the color-coded pattern 24 is used for a member such as a turbine that rotates or reciprocates.
Or the case where the non-linear pattern 24 ′ is directly attached or the separate identification members 28, 29, 20 are provided and attached, but the present invention is not particularly limited thereto. As shown in FIG. 16, the identification member 29 of another color is separated from the movable member such as the turbine and inserted and fixed to the background of the movable member. A color-coded pattern 24 is formed in a state where the blade 23 and the identification member 29 serving as the background are clearly separated, and the identification member 29 is hidden by the turbine blade 23 during rotation, so that it appears as a single different color. Can be easily determined visually.

[0040]

As described above, according to the flowmeter of the first aspect, when a pattern or a non-linear pattern which is alternately color-coded in the direction of movement / rotation of the turbine or the movable member appears stationary. If it is in a stopped state, and it looks like it is moving, or it looks like one color or no pattern, it is in a rotating state, so that the operation state of the turbine or the movable member can be determined.
In addition, since this visual determination is based on simple recognition of a color-coded pattern or a non-linear pattern, it can be easily confirmed.

According to the flowmeter of the present invention, a color-coded pattern or the like can be formed on a turbine or the like only by assembling an identification member provided with a color-coded or non-linear pattern. It is easier to pattern.

Further, according to the flowmeter of the third aspect,
Different hues are formed between the identification member and the turbine blade, so that the stop and the rotation can be easily discriminated visually.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rotating shaft of a turbine showing an example of an embodiment of a flow meter to which the present invention is applied.

FIG. 2 is a side view of the turbine.

FIG. 3 is a perspective view of a turbine rotating shaft during rotation.

FIG. 4 is a perspective view of a rotating shaft of a turbine in which the number of color-coded divided areas is further increased.

FIGS. 5A and 5B are perspective views showing an example of a rotating shaft of a turbine provided with a pattern such as a curve, in which FIG.
Indicates a wave-shaped boundary between two color surfaces.

FIG. 6 is a perspective view of a cylindrical colored molding member provided with cutouts at regular intervals and a rotating shaft.

FIG. 7 is a perspective view of a turbine having a color-coded pattern on a rotating shaft.

8 (A) when the turbine shown in FIG. 7 is stopped and (B)
It is a side view which shows how to look at the time of rotation.

FIG. 9 is a perspective view of a turbine in which a rotating shaft and a turbine blade are colored differently.

FIG. 10 is a side view showing how the turbine shown in FIG. 9 looks when (A) is stopped and (B) when it is rotating.

FIG. 11A shows a turbine in which the end face of the rotating shaft is color-coded.
It is a front view at the time of a stop and at the time of (B) rotation.

FIG. 12 is a perspective view of a turbine in which only a colored portion is separately formed and provided on an end face to perform color coding.

FIG. 13 is a perspective view of a turbine in which a side having a turbine blade and a side having a rotating shaft are formed as separate members, and are combined with each other to have different hues.

14 is a side view showing how the turbine shown in FIG. 13 looks when (A) is stopped and (B) when it is rotating.

FIG. 15 is a cross-sectional view of a flow path showing a flow meter that can be visually recognized through a viewing window provided in a case of a water purifier.

FIG. 16 is a diagram showing a modified example of the form in which one of the colored and molded portions is fixed in the flow meter shown in FIG.

FIG. 17 is a central longitudinal sectional view showing an example of an embodiment of a flow meter.

FIG. 18 is a plan view of the flow meter.

FIG. 19 is a side view of the dial of the scale display device.

FIG. 20 is a diagram illustrating the operation of an internal gear planetary gear train that constitutes the reduction mechanism of the measurement unit.

FIG. 21 is a perspective view showing an example of a water purifier incorporating the flow meter of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flow meter 23 Turbine blade 24 Color-coded pattern 24 'Non-linear pattern 24a, 24b Colored area constituting color-coded pattern 20, 28 Color-coded identification member 29 Identification member colored with a hue different from that of turbine blade

Claims (3)

[Claims] In a flow meter provided with a turbine rotating with the flow of a fluid to be measured or a movable member to which rotation from the turbine is transmitted, the turbine is rotated or reciprocated at a position observable from outside the turbine or the movable member. A flow meter, wherein a color-coded pattern of at least two colors or a non-linear pattern such as a curve is alternately color-coded or displayed in a motion direction such as motion. 2. An identification member provided with the color-coded pattern or a non-linear pattern in the direction of movement or configured with another member is mounted on the turbine or the movable member and provided so as to rotate integrally. The flowmeter according to claim 1, wherein 3. The flow meter according to claim 1, wherein an identification member colored in a different hue from the turbine blade is disposed between the turbine blades and provided so as to be seen alternately with the turbine blade. .