JP2007147572A - Axial flow impeller-type water meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial flow impeller-type water meter, capable of efficiently adding up the volume correctly by acting fluid pressure on an impeller, especially in domains of little fluid flow, while maintaining instrumental error performance in region of high fluid flow amount. <P>SOLUTION: The axial flow impeller-type water meter where a rectifier 5 is prepared on the upstream side of inside a case 1 with an inflow port 2 at an end and an outflow port 3 at the other end and an impeller 6, rotating in response to fluid pressure of fluid, is prepared at the downstream side, is characterized in that it comprises the rectifier 5 of rectifier hub 7 and a flowing channel 4 established on the periphery of this rectifier hub 7, by comprising the impeller 6 of an impeller hub 16 having an impeller shaft 15, a flowing channel 4 established at the periphery of the impeller hub 16, and a plurality of impellers 17 having a tilting blade plane 17a tilted with respect to the impeller shaft 15, while projecting radially from the outer peripheral surface of the impeller hub 16, and by installing a fluid-inducing grooves 21 and 22 orienting the fluid flowing from the upstream to the downstream of the flowing channel 4 to the blade plane 17a of the impeller 6, on the rectifier hub 7 and the outer peripheral surface of the impeller hub 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an axial-flow impeller-type water meter having an impeller that rotates by receiving fluid pressure of a fluid.

  A vertical axial-flow impeller-type water meter that displays the consumption of tap water in an integrated manner is configured as shown in FIG. That is, an inflow port 2 is provided on one end side of the case 1 and an outflow port 3 is provided on the other end side. A flow passage 4 through which tap water flows is provided inside the case 1, and a flow passage 4 is provided with a rectifier 5 and an impeller 6 that rotates by receiving fluid pressure of the fluid.

  The rectifier 5 is formed of a rectifier boss 7, ribs 8 that project radially from the rectifier boss 7, and an outer cylinder 9 that is integrally connected to the outer ends of the ribs 8. The outer cylinder 9 of the rectifier 5 is integrally provided with a flange 10, and the flange 10 is locked to an opening edge 13 of an opening 12 provided in the partition wall 11 of the case 1. Further, a pivot shaft 14 projects upward from the axial center of the rectifier boss 7, and the impeller 6 is rotatably supported on the pivot shaft 14.

  The impeller 6 is provided with an impeller boss 16 having an impeller shaft 15, and the impeller boss 16 is provided with a plurality of blades 17 that integrally project radially at equal intervals. These blades 17 have a blade surface 17 a that is spiral and inclined with respect to the impeller shaft 15, receives the fluid pressure of tap water rising from the rectifier 5, and the impeller 6 rotates. The impeller 6 is surrounded by a cylindrical impeller casing 18 on the outer periphery of the impeller 17, and a measuring chamber 19 is formed therein. Further, the impeller casing 18 is integrally provided with a flange portion 18a.

Although not shown, the impeller shaft 15 is linked to an instruction mechanism via a speed reduction mechanism, and an instruction for integrating the flow rate (consumption) of tap water flowing from the inlet 2 of the case 1 to the outlet 3 via the flow passage 4 is provided. It is supposed to be.
The axial-flow impeller-type water meter configured as described above is known from, for example, Patent Document 1, and is configured to have an ideal instrumental difference curve from a minute flow rate region to a large flow rate region.
Japanese Patent No. 3209593

However, the conventional axial flow impeller-type water meter including the one described in the above-mentioned Patent Document 1 has a flow rate of tap water rising from the rectifier 5 is slow (in the case of a minute flow rate), and is placed in the measuring chamber 19. The fluid pressure for rotating the impeller 6 installed vertically is significantly reduced. Accordingly, the rotational speed of the impeller 6 is reduced or fixed (not correlated with the flow of water), and the integration of the volume passing through the measuring chamber 19 is inaccurate or not integrated. For this reason, even when the flow rate of the tap water rising from the rectifier 5 is slow (in the case of a minute flow rate), the fluid pressure is efficiently applied to the impeller 6 in the measuring chamber 19, and the volume that has passed through the measuring chamber 19. It is desired that the integration of these can be performed accurately.
The present invention has been made paying attention to the above circumstances, and the object thereof is to effectively apply fluid pressure to an impeller particularly in a minute flow rate region while maintaining instrumental error performance in a large flow rate region. And providing an axial-flow impeller water meter capable of accurately accumulating the volume.

  In order to solve the above-mentioned object, the present invention provides a rectifier on the upstream side of a case having an inflow port at one end and an outflow port at the other end, and rotates on the downstream side by receiving fluid pressure of the fluid. In the axial flow impeller-type water meter provided with the rectifier, the rectifier boss and a flow passage provided on the outer periphery of the rectifier boss, the impeller has an impeller shaft and an impeller boss, The flow path provided on the outer periphery of the impeller boss, and a plurality of blades having a blade surface that protrudes radially from the outer peripheral surface of the impeller boss and is inclined with respect to the impeller shaft, A fluid guide groove is provided on the outer peripheral surface of at least one of the rectifier boss and the impeller boss to direct the fluid from the upstream side to the downstream side of the flow passage toward the blade surface of the impeller.

  Preferably, the fluid guide groove provided in the impeller boss has a triangular shape having a base at the most upstream end of the impeller boss and a hypotenuse extending toward the downstream side. To do.

  One oblique side extending toward the downstream side of the triangular fluid guide groove preferably has substantially the same inclination angle as the blade surface of the impeller.

  Preferably, the fluid guide groove provided in the rectifier boss has a triangular shape having a bottom side at the most downstream end of the rectifier boss and a hypotenuse extending toward the upstream side.

  According to the present invention, while having a simple configuration in which a fluid guiding groove is provided on the outer peripheral surface of at least one of the rectifier boss and the impeller boss to be directed to the impeller blade surface, the instrumental difference performance in a large flow rate region is provided. While maintaining the above, there is an effect that the fluid pressure can be efficiently applied to the impeller particularly in a minute flow rate region, and the volume can be accurately integrated.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show a first embodiment, FIG. 1 is a longitudinal side view of a vertical axial-flow impeller water meter, FIG. 2 shows a rectifier, (a) is a plan view, and (b) is one. FIG. 3 shows an impeller, (a) is a side view, and (b) is a bottom view.
As shown in FIG. 2, the rectifier 5 is integrally formed of, for example, a synthetic resin material, and has a substantially hemispherical rectifier boss 7 protruding downstream, and ribs 8 protruding radially integrally from the rectifier boss 7. The outer cylinders 9 are integrally connected to the outer ends of the ribs 8. A plurality of fluid guiding grooves 21 are provided at equal intervals in the circumferential direction on the outer peripheral surface at the most downstream end 7 a of the rectifier boss 7.

  These fluid guide grooves 21 are arranged in a one-to-one correspondence with the distance between the blades 17 of the impeller 6, and the shape thereof has a bottom side 21 a at the most downstream end 7 a of the rectifier boss 7, and the upstream side It has sides 21b and 21c extending toward. And the angle which the base 21a and the edge | side 21c of the fluid induction groove | channel 21 comprise is a right-angled triangle shape with a right angle. Further, the fluid guide groove 21 is deepest in the vicinity of the bottom side 21 a and is gradually shallower from the bottom side 21 a toward the top part 21 d, and tap water from the downstream of the rectifier 5 toward the impeller 6 is impellered by the fluid guide groove 21 of the rectifier 5. It is formed so as to be directed to the six blade surfaces 17a.

Further, as shown in FIG. 3, the impeller 6 is also integrally formed of a synthetic resin material like the rectifier 5, and the impeller boss 16 is provided with a plurality of blades 17 that integrally project radially at equal intervals. It has been. These blades 17 have a blade surface 17 a that is spiral and inclined with respect to the impeller shaft 15, receives the fluid pressure of tap water rising from the rectifier 5, and the impeller 6 rotates.
A plurality of fluid guiding grooves 22 are provided on the outer peripheral surface of the impeller boss 16, that is, the outer peripheral surface at the most upstream end portion 16 a between the blades 17. These fluid guide grooves 22 have a bottom side 22a at the most upstream end 16a of the impeller boss 16 and sides 22b and 22c extending toward the downstream side. The angle formed by the bottom side 22a of the fluid guide groove 22 and one side 22c is formed in a right-angled triangular shape, and the other side 22b is substantially parallel to the inclined blade surface 17a (approximately 50 °). . Further, the fluid guiding groove 22 is deepest in the vicinity of the bottom side 22a, and is gradually shallower from the bottom side 22a toward the top portion 22d. Then, the tap water directed from the rectifier 5 toward the impeller 6 is directed to the impeller surface 17a of the impeller 6 by the fluid guide groove 22, and a large torque is generated in the impeller 6 toward the outer peripheral side of the impeller 17. I have to.

  Further, as shown in FIG. 1, a driving side magnet 23 constituting a magnetic coupling is fixed to the upper end portion of the impeller shaft 15 of the impeller 6. Further, a driven magnet 25 that constitutes a magnetic coupling is provided on the upper surface side of the bottom 24 a of the inner case 24 of the case 1 at a portion facing the driving magnet 23. The driven magnet 25 is integrally provided with a gear 26, and the gear 26 is interlocked with a reduction gear mechanism 27. Further, the reduction gear mechanism 27 is interlocked with an integration instruction mechanism 29 close to the instruction window 28 on the upper part of the case 1 so as to instruct an integration flow rate.

  The axial-flow impeller-type water meter thus configured has an upstream side connected to a water main or the like, and a downstream side connected to a faucet or the like via a water pipe. When the tap is opened and the tap water flows out of the tap, the tap water flows from the inlet 2 through the flow passage 4 in the case 1 and flows into the measuring chamber 19 through the rectifier 5. The impeller 6 and the impeller shaft 15 in the measuring chamber 19 rotate around the pivot shaft 14 by the fluid pressure of the tap water. The rotation of the impeller shaft 15 is transmitted from the driving side magnet 23 to the driven side magnet 25, and the rotation of the driven side magnet 25 is transmitted to the reduction gear mechanism 27 via the gear 26. The rotation of the reduction gear mechanism 27 is transmitted to the accumulation instruction mechanism 29, and the fluid flow rate is instructed to the accumulation instruction mechanism 29.

  At this time, when the tap water flowing through the flow passage 4 in the case 1 passes through the rectifier 5, it passes through the passage between the ribs 8 along the outer peripheral surface of the rectifier boss 7. Are provided with a plurality of fluid guide grooves 21. These fluid guiding grooves 21 have a right triangle shape, and their sides 21b are substantially parallel to the blade surface 17a of the inclined impeller 6. In addition, the fluid guiding groove 21 is deepest in the vicinity of the bottom 21a, and is gradually shallower from the bottom 21a toward the top 21d. Therefore, tap water from the rectifier 5 toward the impeller 6 can be directed to the impeller surface 17a of the impeller 6.

  Further, a plurality of fluid guiding grooves 22 are provided on the outer peripheral surface of the impeller boss 16. These fluid guide grooves 22 have a right triangle shape, and their sides 22b are substantially parallel to the inclined blade surface 17a. In addition, the fluid guide groove 22 is deepest in the vicinity of the bottom 22a, and is gradually shallower from the bottom 22a toward the top 22d. Therefore, since tap water is directed to the blade surface 17a of the impeller 6 and toward the outer peripheral side of the blade 17, the fluid pressure of tap water can be effectively transmitted to the impeller 6.

Since the fluid pressure of tap water can be effectively transmitted to the impeller 6, even when the flow rate of tap water flowing from the rectifier 5 to the impeller 6 is slow (a minute flow rate), the impeller 6 can be efficiently transmitted. It can be rotated by applying fluid pressure, and the volume passing through the measuring chamber 19 can be accurately integrated. That is, conventionally, the minute flow rate in which the rotational speed of the impeller 6 is reduced or fixed (becomes uncorrelated with the flow of water) and the integration of the volume passing through the measuring chamber 19 is inaccurate or not integrated. There is an effect that the volume can be accurately integrated in the region.
In the first embodiment, the fluid guide groove 22 is provided in the impeller boss 16 and the fluid guide groove 21 is provided in the rectifier boss 7. However, the fluid guide groove 22 is provided in the impeller boss 16, and the rectifier boss 7 is provided. When the fluid guide groove 21 is not provided (second embodiment), or conversely, the rectifier boss 7 is provided with the fluid guide groove 21 and the impeller boss 16 is not provided with the fluid guide groove 22 (third embodiment). Even in the embodiment), the fluid pressure of tap water from the rectifier 5 toward the impeller 6 can be efficiently applied to the impeller 6 to be rotated. Therefore, even when the flow rate of the tap water flowing from the rectifier 5 toward the impeller 6 is slow (micro flow rate), the impeller 6 can be efficiently rotated by applying fluid pressure, and passes through the measuring chamber 19. Accurate volume accumulation.
Table 1 shows that the fluid guide grooves 21 and 22 are provided in both the impeller boss 16 and the rectifier boss 7, and the fluid guide grooves are provided in both the impeller boss 16 and the rectifier boss 7. The instrumental difference with the comparative example which does not provide 21 and 22 is shown in contrast.

FIG. 4 shows an instrumental performance curve in which Table 1 is graphed, curve A is the case of the first embodiment of the present invention, and curve B is a comparative example. As shown by the curve A, the fluid guide grooves 21 and 22 provided in the impeller boss 16 and the rectifier boss 7 improve the sensitivity in a minute flow rate region, and the fluid pressure efficiently acts on the impeller 6 and the measuring chamber. It can be seen that the volume passing through 19 can be accurately integrated.
Table 2 shows that the fluid guide groove 22 is provided in the impeller boss 16 and the fluid guide groove 21 is not provided in the rectifier boss 7. In the second embodiment of the present invention, either the impeller boss 16 or the rectifier boss 7 is provided. FIG. 6 also compares the instrumental difference with the comparative example in which the fluid guiding grooves 21 and 22 are not provided.

FIG. 5 shows an instrumental performance curve in which Table 2 is graphed. Curve C is the case of the second embodiment of the present invention, and curve B is a comparative example. As shown by the curve C, the fluid guide groove 22 provided in the impeller boss 16 improves the sensitivity in the minute flow rate region, and the volume of the volume passing through the measuring chamber 19 due to the fluid pressure efficiently acting on the impeller 6. It can be seen that the accumulation can be performed accurately.
Table 3 shows that the fluid guide groove 21 is provided in the rectifier boss 7 and the fluid guide groove 22 is not provided in the impeller boss 16, and any one of the impeller boss 16 and the rectifier boss 7 is provided in the third embodiment of the present invention. FIG. 6 also compares the instrumental difference with the comparative example in which the fluid guiding grooves 21 and 22 are not provided.

FIG. 6 shows an instrumental performance curve in which Table 3 is graphed, curve D is the case of the third embodiment of the present invention, and curve B is a comparative example. As shown by the curve D, the fluid guide groove 21 provided in the rectifier boss 7 improves the sensitivity in a minute flow rate region, and the volume of the volume passing through the measuring chamber 19 due to the efficient fluid pressure acting on the impeller 6. It can be seen that can be performed accurately.
In the above-described embodiment, the vertical axial flow impeller type water meter has been described, but it is needless to say that the present invention can also be applied to a horizontal axial flow impeller type water meter. In addition, the fluid guide grooves 21 and 22 are formed in a right triangle shape, but may be an isosceles triangle shape, and is not limited to a triangle shape, and the flow rate of tap water flowing from the rectifier 5 to the impeller 6 is slow ( Even in the case of a minute flow rate, the shape of the groove is not limited as long as the fluid pressure efficiently acts on the impeller 6.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be combined.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal side view of an axial-flow impeller water meter showing a first embodiment of the present invention. The rectifier of the embodiment is shown, (a) is a plan view, (b) is a partially cutaway side view. The impeller of the embodiment is shown, (a) is a side view, (b) is a bottom view. Instrumental difference performance curve diagram. Instrumental difference performance curve diagram. Instrumental difference performance curve diagram. The longitudinal side view of the conventional axial flow impeller-type water meter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... Inlet, 3 ... Outlet, 4 ... Flow path, 5 ... Rectifier, 6 ... Impeller, 7 ... Impeller boss, 15 ... Impeller shaft, 16 ... Impeller boss, 21, 22 ... Fluid Guide groove

Claims (4)

In the axial flow impeller water meter provided with a rectifier on the upstream side of the inside of the case having an inlet at one end and an outlet at the other end, and provided with an impeller that rotates by receiving fluid pressure of the fluid on the downstream side,
The rectifier comprises a rectifier boss and a flow path provided on the outer periphery of the rectifier boss,
The impeller protrudes radially from an impeller boss having an impeller shaft, a flow passage provided on the outer periphery of the impeller boss, and an outer peripheral surface of the impeller boss, and is inclined with respect to the impeller shaft. It is composed of a plurality of blades having a blade surface,
An axial flow characterized in that a fluid guide groove is provided on the outer peripheral surface of at least one of the rectifier boss and the impeller boss to direct fluid from the upstream to the downstream of the flow passage toward the impeller blade surface. Impeller water meter.   The fluid guide groove provided in the impeller boss has a triangular shape having a base at the most upstream end of the impeller boss and a hypotenuse extending toward the downstream side. 1. An axial impeller water meter according to 1.   The axial flow impeller type according to claim 2, wherein one oblique side extending toward the downstream side of the triangular fluid guide groove substantially coincides with an inclination angle of a blade surface of the impeller. Water meter.   2. The fluid guide groove provided in the rectifier boss has a triangular shape having a base at the most downstream end of the rectifier boss and a hypotenuse extending toward the upstream side. Axial flow impeller water meter.

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