JP2579326Y2 - Impeller water meter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller-type water meter having both a backflow preventing function and a closing function.

[0002]

2. Description of the Related Art In general, an impeller type water meter has a case body provided with an inlet and an outlet, and a measuring chamber for accommodating the impeller. The impeller is rotatably supported in the measuring chamber by a pivot shaft, and is rotated by receiving a fluid force entering the measuring chamber from the inlet body.

In this case, the fluid force flowing from the inlet into the measuring chamber is effectively applied to the blades of the impeller, and even if the flow rate is very small, the impeller can accurately rotate and measure according to the flow rate. It is desirable to do so. Therefore, conventionally, improvements have been made such as opening the inflow body tangentially to the measuring chamber so as to act on the tip of the impeller, or reducing the weight of the impeller to reduce resistance during rotation. I have.

[0004] However, even when tap water is not used, pulsation and backflow often occur in the water meter and the water supply pipe connected thereto. Furthermore, there is a stagnation of air bubbles in the bent portion of the water supply pipe, which promotes the pulsation. Therefore, there is a problem that the impeller in the measuring chamber rotates due to pulsation or backflow inside the water pipe and the water meter.

Therefore, Japanese Patent Application Laid-Open No. 55-90819 discloses
As disclosed in Japanese Utility Model Application Laid-Open No. 15630/1985, a check valve is provided inside the case body to prevent abnormal rotation of the impeller even if pulsation or backflow occurs inside the case body, thereby enabling accurate measurement. An impeller-type water meter was developed as described above.

[0006]

However, in the impeller type water meter provided with the above-described check valve, the check valve closes when pulsation and back flow occur inside the case body, and the impeller rotates. It does not have the function of completely blocking the flow passage in the case body.

That is, when the water supply to the demand side is to be stopped according to the intention of the supply side such as the water bureau, or when the customer wants to stop the water supply due to absence or moving for a long period of time, it cannot cope. Further, if a shut-off valve is provided in the case body separately from the check valve, the water meter becomes large and has a complicated structure, resulting in an increase in cost.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent abnormal rotation of the impeller even if pulsation or backflow occurs. It is an object of the present invention to provide an impeller-type water meter that can easily cope with a case where it is desired to stop the water supply according to a side's intention or a consumer's intention.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a flow path having an inlet and an outlet in a case body having an inlet and an outlet. Provide a partition wall with a distribution port in part,
When the fluid flowing through the flow path flows back to the downstream side of the flow port at the upper part of the partition wall, a ball valve for backflow prevention that closes the flow port with the fluid pressure is provided. Further, a valve closing member for closing the flow opening by pressing down the ball valve is provided in the case body, and a restraining member for restraining the valve closing member is provided outside the case body.

[0010]

In normal operation, the ball valve is movable up and down since the valve closing member is held by the restraining member in a state of being pulled up during normal use, and when pulsation or backflow occurs inside the case main body, the ball valve is activated. Close the flow port to prevent backflow. When it is desired to stop the water supply according to the intention of the water supply bureau or the supply side or the demand of the consumer, the ball valve is pushed down by the valve closing member, the distribution port is closed by the ball valve, and this valve closing member is operated by the restricting member. By disabling, the distribution port is kept closed.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an impeller-type water meter.
1 is a case main body. The case body 1 is provided with an inlet 2, an outlet 3, and a measuring chamber 4. A pivot shaft 5 projecting from the bottom is provided at the center of the measuring chamber 4, and an impeller 6 is rotatably supported on the pivot shaft 5.

A gear 8 is integrally provided at the upper end of the shaft 7 of the impeller 6, and the gear 8 is interlocked with a reduction gear mechanism 9. Further, the reduction gear mechanism 9 is linked to an integration instruction mechanism 11 close to an instruction window 10 at an upper portion of the case main body 1 so as to indicate an integrated flow rate.

A partition wall 15 for dividing the flow passage 12 into an upstream side 13 and a downstream side 14 is provided on the inlet body 2 side of the case body 1. A horizontal portion is provided in a part of the partition wall 15, and a flow port 16 is formed in the horizontal portion. That is, the upstream side 13 and the downstream side 14 communicate with each other through the circulation port 16.

A strainer 15a is provided on the upstream side 13 below the partition wall 15 so as to be detachable from a flow opening 16, and a cylindrical valve box 17 is provided on the downstream side above the partition wall 15.
Is provided. The valve box 17 is formed of a synthetic resin material, and has an opening window 18 on the outer peripheral wall and openings 19 and 20 on the upper and lower surfaces. A valve seat 21 that fits into the opening edge of the flow port 16 is provided integrally with the opening 20 on the lower surface.

A ball valve 22 made of a synthetic resin material is accommodated in the valve box 17. The ball valve 22 can move up and down inside the valve box 17. When the ball valve 22 moves down, it joins with the valve seat 21 to close the flow opening 16. It protrudes and opens the distribution port 16.

A through hole 23 is formed in the upper wall of the case body 1 facing the upper surface of the valve box 17.
The plug 24 is screwed and fixed to the. A bearing hole 25 penetrating in the vertical direction is formed in the center of the plug 24, and a valve closing member 26 is inserted through the bearing hole 25 so as to be vertically movable.

A cap 27 is screwed into the plug 24,
The bearing hole 2 through which the valve closing member 26 is inserted
8 are provided. The valve box 1 is provided at the lower end of the valve closing member 26.
7 is provided with a conical valve pressing portion 29 which is in contact with the upper portion of the ball valve 22. A first operating portion 30 at the upper end is provided with a first hole formed in a direction orthogonal to the axial direction of the valve closing member 26. Side hole 3
0a and the second horizontal hole 30b are provided vertically separated from each other.

A through hole 31 having the same diameter as the first and second lateral holes 30a and 30b is formed in the cap 27, and a lock pin 32 as a restraining member is removably inserted into the through hole 31. It is provided in. That is, when the valve closing member 26 is pulled up, the first lateral hole 30a faces the through hole 31, and
The lock pin 32 penetrates through the first lateral hole 30a and locks the valve closing member 26 so that it cannot move up and down.

When the ball valve 22 is pressed against the valve seat 21 by the valve holding portion 29 by pushing down the valve closing member 26, the second lateral hole 30b faces the through hole 31 and the lock pin 32 is moved to the second lateral position. The valve closing member 26 is locked immovably up and down through the hole 30b.

Further, a cover 33 for covering the operation portion 30 of the valve closing member 26 is screwed into the cap 27. The cover 33 and the case body 1 are connected by a sealed chain 34, and the chain 34 is not removed. As long as the cover 33 cannot be opened.

In the impeller-type water meter configured as described above, in normal use, the valve closing member 26 is pulled up, the first lateral hole 30a and the through hole 31 are opposed to each other, and the lock inserted into the through hole 31 is used. By inserting the pin 32 into the first lateral hole 30a, the valve closing member 26 is restrained in a state where it is pulled up.

Therefore, the ball valve 2 inside the valve box 17
Numeral 2 is movable up and down, and when the tap water or the like provided in the water pipe on the downstream side of the impeller water meter is opened and the tap water flows out of the tap, the tap water flows from the inflow body 2 to the case body 1. The fluid flows through the port 16 and pushes up the ball valve 22 by the fluid pressure at this time.
Flows into. Therefore, the impeller 6 in the measuring chamber 4 rotates, and the fluid flow rate is instructed by the integration instructing mechanism 11.

When the faucet is closed, the water pipe and the water flow in the case body 1 are stopped, so that the ball valve 22 is lowered by its own weight, and the ball valve 22 is joined to the valve seat 21 so that the flow port 16 is closed by the ball valve 22. You. In this state, even if pulsation or backflow occurs in the water supply pipe, the water flow can be shut off by the ball valve 22 provided in the case body 1, and the impeller 6 in the measuring chamber 4 rotates carelessly. I will not do it. As a result, the actual flow rate can be accurately measured.

Further, when the water supply to the demand side is stopped according to the intention of the water supply bureau or the like, or when the customer stops the water supply due to absence or moving for a long time,
First, the chain 34 is removed, the cover 33 is removed, and the lock pin 32 is once removed from the through hole 31.

Next, when the operation portion 30 of the valve closing member 26 is pressed down by a finger and the ball valve 22 is pressed against the valve seat 21 by the valve pressing portion 29, the flow port 16 is closed by the ball valve 22. When the valve closing member 26 is depressed in this manner, the through hole 31 and the second lateral hole 30b face each other.
By passing the lock pin 32 through the second lateral hole 30b, the valve closing member 26 is locked immovably up and down.

That is, the state in which the ball valve 22 is pressed against the valve seat 21 and the state in which the flow of tap water is cut off inside the case body 1 can be maintained. Also, the cap 27
By screwing a cover 33 that covers the operation part 30 of the valve closing member 26 into the valve closing member 33, the cover 33 and the case body 1 are connected and sealed by a chain 34, so that the valve closing member 26 is not operated mischievously. Unauthorized use of tap water can be prevented.

The case body 1 facing the distribution port 16
A through hole 23 is provided in the upper wall of the
By removing the plug 24, the valve box 17 and the strainer 15a can be taken out upward from the through hole 23, and the strainer 15a can be easily cleaned.

FIG. 2 shows an impeller-type water meter having a closing function. The same components as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. A cylindrical portion 3 is provided on the inflow side of the case body 1.
5 is provided integrally, and an inlet 37 containing a strainer 36 is screwed into the opening of the cylindrical portion 35 and fixed.

The inner peripheral portion of the cylindrical portion 35 and the inner peripheral portion of the inflow body 37 are provided with annular convex portions 35a, 37a projecting inward, and the cylindrical portion 35 between these annular convex portions 35a, 37a.
Is formed with a valve chamber 38. Valve seats 39, 39 supported by annular convex portions 35a, 37a are provided inside the valve chamber 38, and a ball valve 40 is rotatably provided between the valve seats 39, 39.

The ball valve 40 has a through hole 4 passing through its center.
1 and the ball valve 40 is turned by 90 °
By making 1 orthogonal to the flow direction, the flow of tap water can be cut off.

A bearing cylinder 42 projects from an upper wall of the cylindrical portion 35 facing the valve chamber 38, and a valve operating shaft 43 is rotatably inserted through the bearing cylinder 42. Valve operating shaft 43
An engagement portion 44 for engaging with the ball valve 40 is provided at a lower end portion, and a square or polygonal operation portion 45 is provided at an upper end portion.

Further, an adapter 46 is screwed to the outside of the bearing cylinder 42, and a cover 47 for covering the operation section 45 is screwed to the adapter 46. The cover 47 and the case body 1 are connected by a sealed chain 34, and the chain 3
The cover 47 cannot be opened unless the cover 4 is removed.

According to the impeller-type water meter configured as described above, the cover 47 is removed, the operation unit 45 is rotated by a special tool, and the ball valve 40 is rotated by 90 ° via the valve operation shaft 43. By making the through-holes 41 perpendicular to the flow direction, the flow of tap water can be cut off. Therefore, it is possible to keep the valve closed, and it is possible to easily cope with a case where the water supply is to be stopped according to the intention of the supply side such as the water bureau or the demand of the consumer, and it is possible to prevent unauthorized use of tap water.

[0035]

As described above, according to the present invention, the ball valve is provided in the circulation port inside the case body, so that the ball valve closes when pulsation and backflow occur, so that the blade Abnormal rotation of the car can be prevented, and accurate weight reduction can be achieved.

Further, the ball valve can be held in a closed state by a valve closing member.
When the user wants to stop the water supply according to his / her intention, the water supply can be easily dealt with, and there is an effect that the unauthorized use of the tap water can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of an impeller type water meter showing one embodiment of the present invention.

FIG. 2 is a vertical side view of another impeller type water meter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Case main body, 2 ... Inlet body, 3 ... Outlet body, 4 ... Measuring chamber, 6 ... Impeller, 12 ... Flow passage, 15 ... Partition wall, 1
6 ... distribution port, 22 ... ball valve, 26 ... valve closing member, 30 ...
Operation part, 32 ... lock pin (restraint member).

Claims (1)

(57) [Scope of request for utility model registration] 1. A case body having an inflow body and an outflow body, a measuring chamber having an impeller provided inside the case body, and a flow passage provided on the inflow body side of the case body in an upstream direction. A partition wall which is divided into a downstream side and has a flow port in a part thereof, and when the fluid flowing through the flow path is provided on the downstream side of the flow port so as to be movable up and down, the flow port is closed by the fluid pressure. A ball valve for preventing backflow, a valve closing member provided with an operating part protruding outside the case body to close the flow opening by pushing down the ball valve, and the valve closing member provided outside the case body An impeller-type water meter comprising a restraining member for restraining the member.