JPH0518797A - Aqueduct meter for high temperature water - Google Patents

Abstract

PURPOSE:To prevent the abnormal wear of a sliding part between a bearing and an impeller and adverse effect on a magnetic sensor or the like due to high temperature around the bearing of the impeller of a high temperature water aqueduct meter. CONSTITUTION:An impeller 12 is rotatably enclosed being supported by bearings 13, 16 inside a measuring chamber 12 in an aqueduct meter. This measuring chamber 12 is partitioned by a partition member 30. A clearance 32 is provided between the bearing 16 and the partition member 30 in such a way as to pass the back side of the partition member 30, thus forming a part of a by-pass passage A communicated with the measuring chamber 12 from around the bearing 16. When high temperature water flows from an inlet 10a to an outlet 10b to rotate the impeller 14. a part of the high temperature water flows in the by-pass passage A so as to push out residual air from around the bearing 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high temperature water meter for measuring the amount of high temperature water passing through. More specifically, the present invention relates to a water meter for high-temperature water, in which an impeller is rotated according to the flow rate of hot water, and a sensor is turned on and off by a permanent magnet attached to the impeller to measure the flow rate.

[0002]

2. Description of the Related Art A water meter for high temperature water of this type requires, for example, the following. Do not let hot water leak outside. Efficiently apply the hot water flowing through the flow path to the impeller. Protect the magnetic sensor from the heat of hot water.

Therefore, conventionally, there is a hot water meter of this type having a structure as shown in FIG.
That is, while the water-blocking member 1 is installed in the water meter to prevent the high-temperature water from leaking, the water-blocking member 1 is used to partition the measuring chamber 2 to efficiently apply the high-temperature water to the blades 3 a of the impeller 3. In addition, the water-impervious member 1 has a hollow cylindrical portion 1a raised up in the center, and a top plate portion 1b thereof supports a bearing 4, and the bearing 4 allows the upper end of a rotary shaft 3b of the impeller 3 to rotate freely. Be supported by. Then, a permanent magnet 5 attached to the upper end of the rotating shaft 3b is provided in a case 8 provided in the counting display portion 7 outside the hollow cylindrical portion 1a separated from the flow path of the high temperature water.
The magnetic sensor 6 is arranged so as to face the.

[0004]

However, in the conventional structure, the residual air in the hollow portion 1a is collected around the bearing 4. Further, water is passed into the water meter, water pressure is applied, and the impeller 3 is driven to rotate, and the rotary shaft 3 of the impeller 3 is rotated.
The frictional heat between the bearing 4 and the bearing b heats the bearing 4 to a high temperature. Therefore, there are problems that the rotating shaft 3b of the impeller 3 and the bearing 4 are abnormally worn, the magnetic sensor 6 is adversely affected, and the like.

Therefore, an object of the present invention is to prevent abnormal wear of the sliding portion between the bearing and the impeller and adverse effects on the magnetic sensor and the like due to high temperature around the bearing. It is in.

[0006]

Therefore, according to the invention described in claim 1, as shown in the following illustrated embodiments, the measuring chamber 1
A water supply for high-temperature water in which the impeller 14 is rotatably accommodated in the bearing 2 by being supported by bearings 13 and 16 and hot water is applied to the impeller 14b of the impeller 14 to measure the passing flow rate from the rotation of the impeller 14. In the meter, the partition member 30 for partitioning the measuring chamber 12 is arranged so as to form bypass passages A and B that pass through the back side of the partition member 30 and communicate with the surroundings of the bearing 16 to the measuring chamber 12, and also allow high temperature water to leak to the outside. It is characterized in that the water-blocking member 15 that is not provided is arranged outside the partition member 30.

According to a second aspect of the present invention, in the first aspect of the invention, the bearing 16 is supported by the water-blocking member 15 and the bearing 15 and the partition are provided, as shown in the following embodiments. It is characterized in that a gap 32 is provided between the member 30 and a part of the bypass passage A.

According to a third aspect of the present invention, in the first aspect of the invention, the bearing 16 is supported by the partition member 30 and the partition member 3 is provided as shown in the following illustrated embodiments.
It is characterized in that a part of the bypass passage B is formed by opening the through holes 30i and 30j in 0.

[0009]

In the invention described in claim 1, the impeller 1
When 4 is rotated, a part of the high temperature water flows through the bypass path A and pushes out residual air from around the bearing 16.

According to the second aspect of the present invention, when the impeller 14 is rotated, a part of the high temperature water flows through the gap 32 between the bearing 16 and the partition member 30 to push out residual air from around the bearing 16.

According to the third aspect of the present invention, when the impeller 14 is rotated, a part of the high temperature water flows into the flow passage 30 of the partition member 30.
Residual air is pushed out around the bearing 16 by flowing through i · 30j.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a vertical sectional view of a high-temperature water meter according to an embodiment of the present invention. Reference numeral 10 in the drawing is a lower case. The lower case 10 has a bottomed tubular shape that opens upward, and projects outwardly from the outer periphery of the lower end portion on the left side of the figure in a tubular shape to provide a high-temperature water inlet 10a at the tip, and a filter 11 provided therein. Similarly, on the right side, an outlet 10b is provided at the tip by protruding outwardly from the outer periphery of the lower end in a cylindrical shape. At the upper end of the lower case 10, a step portion 10c is provided on the inner circumference and a screw portion 10d is provided on the outer circumference. A measuring chamber 12 is provided in the lower case 10, and a bearing 13 projects upward at the center of the bottom portion 12a. An impeller 14 is housed in the measuring chamber 12. The impeller 14 is provided with a blade 14b on the outer periphery of the lower end portion of the rotating shaft 14a, and the lower end of the rotating shaft 14a is attached to the bearing 1
It is supported by 3. The rotating shaft 14b of the impeller 14 has its upper end supported by a bearing 16 provided on the water-blocking member 15, and
A permanent magnet 17 is integrally provided on the outer circumference of the upper end. The water-impervious member 15 has a flat lid shape, and a packing 18 is provided between an upper peripheral edge portion 15 a of the outer periphery and an upper end of the lower case 10,
The lower peripheral edge portion 15b is attached to the inner circumference of the upper end portion of the lower case 10. A ring-shaped upper case 20 is screwed onto the threaded portion 10d of the lower case 10 so as to cover the upper peripheral edge 15a of the water-blocking member 15. On the upper case 20, a counting display unit 22 having a plurality of legs 21 is vertically fixed by the legs 21. A magnetic sensor case 24 is arranged below the central portion of the counting display portion 22 with a gap 23 between the water shielding member 15. A magnetic sensor 25 is housed in the magnetic sensor case 24 so as to face the permanent magnet 17. The magnetic sensor 25 and the count display unit 22 are properly connected.

A partition member 30 is housed in the lower case 10 to partition the measuring chamber 12. The partition member 30 rises the outer cylinder portion 30b from the outer circumference of the bottom portion 30a, and as shown in FIG.
Is provided, and the collar portion 30c is attached to the lower case 10.
The stepped portion 10c is engaged with the stepped portion 10c, and the lower edge portion 15b of the water-impervious member 15 sandwiches and supports the stepped portion 10c. Further, a center hole 30d is provided in the bottom portion 30a of the partition member 30, and an inner cylindrical portion 30e is provided by rising from the peripheral edge thereof around the bearing 16. A gap 32 is provided between the upper end of the inner cylindrical portion 30e and the bearing 16. On the other hand, a gap 33 is provided between the outer circumference of the outer cylinder portion 30b and the inner circumference of the lower case 10, and a plurality of cutout holes 30f for communicating the inside and the outside are provided on the inner circumference of the upper end of the outer cylinder portion 30b. . Then, the gap 33, the notch hole 30f, and the gap 32.
And the like form a bypass passage A that passes through the back side of the partition member 30 and leads from around the bearing to the measuring chamber 12. Below the bottom portion 30a of the partition member 30, an adjuster 35 for adjusting the instrumental error is fixed and the blade 14b is fixed.
Place it between and.

By the way, normally, after the water meter for high-temperature water is assembled, air remains inside. When the hot water flows from the inlet 10a through the measuring chamber 12 to the outlet 10b, the impeller 14 rotates and the pressure in the measuring chamber 12 increases. Then, a part of the high-temperature water flows into the bypass passage A, passes through the gap 33, and passes from the cutout hole 30f to the partition member 3.
It flows to the back of 0. Then, the residual air flows in the direction of the arrow in the bypass path A, passes through the gap 32, and sends out residual air from around the bearing 16 to the outlet 10b.

In the illustrated embodiment described above, the bearing 16 is supported by the water blocking member 15. However, as shown in FIG. 3, the partition member 30 may support the bearing 16. That is, in the partitioning member 30, the top plate portion 30g is integrally formed at the upper end of the inner cylinder portion 30e, and the convex portion 30h is provided downward at the center of the top plate portion 30g to provide the bearing 16
Support. The top plate portion 30g is provided with a circulation hole 30i for residual air and high temperature water as shown in FIG. Further, the upper end portion of the inner cylindrical portion 30e is also provided with a flow hole 30j for residual air and high temperature water. Then, the gap 33, the cutout hole 30f, the flow holes 30i, 30j, etc. form a bypass passage B that passes through the back side of the partition member 30 and leads from around the bearing 16 to the measuring chamber 12.

When the impeller 14 is rotated to increase the pressure in the measuring chamber 12, high temperature water flows into the bypass passage B, passes through the gap 33, and goes from the cutout hole 30f to the rear side of the partition member 30. Flowing. Then, the bearing 16 flows through the bypass B in the direction of the arrow and passes through the flow holes 30i and 30j.
Residual air is sent from the surroundings to the outlet 10b.

[0018]

As described above, according to the present invention, when the impeller is rotated, a part of the high temperature water flows through the bypass passage and pushes out the residual air from around the bearing, so that the residual air does not remain there. The temperature around the bearing does not become high. Therefore, it is possible to prevent abnormal wear of the rotary shaft and the bearing of the impeller and adverse effects on the magnetic sensor and the like.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a water meter for high temperature water according to an embodiment of the present invention.

FIG. 2 is an external perspective view of the partition member.

FIG. 3 is a vertical cross-sectional view of a high temperature water meter according to another embodiment of the present invention.

FIG. 4 is an external perspective view of the partition member.

FIG. 5 is a vertical cross-sectional view of a conventional high temperature water meter.

[Explanation of symbols]

12 Weighing room 13.16 bearing 14 impeller 14b feather 15 Water blocking member 30 partition members 30i ・ 30j Distribution hole 32 gap AB bypass road

[Procedure amendment]

[Submission date] February 13, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

Claims (3)

[Claims] 1. A water meter for high-temperature water, wherein an impeller is supported by bearings in a measuring chamber so as to be rotatably accommodated, and high-temperature water is applied to the impeller blades to measure the flow rate from the rotation of the impeller. A partition member for partitioning the measuring chamber, a bypass member passing through the back side of the partition member to form a bypass path leading from the periphery of the bearing to the measuring chamber, and a water blocking member for preventing high temperature water from leaking to the outside, A water meter for high-temperature water, which is arranged outside the partition member. 2. The high temperature according to claim 1, wherein the bearing is supported by the water-impervious member, and a part of the bypass path is formed by providing a gap between the bearing and the partition member. Water meter for water. 3. The water meter for high-temperature water according to claim 1, wherein the bearing is supported by the partition member, and a flow hole is formed in the partition member to form a part of the bypass passage.