JPH0477190B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention provides a float valve that can release the pressure of a pipe waterway to the atmosphere at one end to lower the pressure of the waterway on the downstream side and regulate the flow rate to the downstream side. Regarding equipment.

(b) Prior Art In a waterway, if the water source is located at a high place, the water pressure increases in proportion to the height of the water source, so the piping must also be made durable in accordance with the height of the water source. However, when the height of the water source exceeds 30 m, the cost of piping materials increases, and therefore it is necessary to reduce the pressure midway through the waterway. For this reason, a pressure reducing device has conventionally been installed in the middle of the waterway.

As shown in FIG. 4, the conventional structure of such a pressure reducing device is that an inlet pipe b and an outlet pipe c are connected to the bottom of a water tank a, and a float d is provided in the water tank a so as to be movable up and down. A float d is connected to one end of a lever f rotatably supported by a fulcrum e,
A valve body i capable of engaging with a valve seat h formed at the open end is provided above the open end of the inlet pipe b, and the valve body i is connected to the other end of the lever f, thereby controlling the vertical movement of the float. Generally, the opening end of the inlet pipe is opened and closed by a valve body.

However, in such a conventional device, the float and the valve body are of a balance type, so the water tank becomes large. There was a problem that foreign matter could enter or sit on the valve seat h, causing malfunction or seal failure.

(c) Problem to be solved by the invention The problem to be solved by the invention is to provide a float valve device for waterways by arranging the valve body directly below the float and connecting the valve body to the float via a toggle mechanism. The objective is to reduce the size of the system, eliminate malfunctions, and make it possible to regulate the flow rate.

(d) Means for solving the problem The present invention provides a water tank having an inlet pipe and an outlet pipe connected to the lower part thereof, a float provided in the water tank,
In a float valve device for a waterway, the valve body is connected to the float and opens and closes the open end of the inlet pipe according to the vertical movement of the float, and the water tank includes an upper part of the open end of the inlet pipe. A guide tube extending vertically is arranged so that the axis line substantially coincides with the center of the open end, the float is arranged around the guide tube so as to be movable up and down, and a lever is provided at the upper part of the guide tube. the valve body is disposed between the open end of the inlet pipe and the lower end of the guide pipe, and the valve body is attached to the lower end of a valve rod movably provided within the guide pipe;
The valve stem is connected to the other end of the lever.

(E) Operation In the above configuration, when there is no water in the tank, the float is lowered to the bottom of the tank, and the valve body rises to open the open end of the inlet pipe. Therefore, the water supplied from the inlet pipe enters the tank and then flows out from the outlet pipe. If water usage in the downstream area is low, the flow out of the outlet pipe will be less than the flow in through the inlet pipe, causing water to accumulate in the tank and causing the float to rise. This causes the valve body to lower and reduce the flow of water from the inlet tube, and when the valve body engages the valve seat, the inflow of water stops.

When the water level in the room on the float side is changed by a weir, the height of the weir determines the opening position of the valve body with respect to the float's waterline, so the flow rate flowing in the tank is also regulated, and the planned setting The amount of water supplied is less than the specified maximum water flow rate.

(f) Examples Examples of the present invention will be described below with reference to the drawings.

In FIG. 1, a waterway float valve device 1 of this embodiment is shown. In the figure, 2 is an aquarium, 3 is an inlet pipe connected to the bottom 25 of the aquarium, and 4 is an outlet pipe also connected to the bottom of the aquarium. A valve seat 5 is formed around the open end of the inlet pipe 3.

A guide pipe 7 extending vertically inside the water tank 2 is disposed directly above the open end of the inlet pipe 3 and with its axis aligned with the center of the open end, and the guide pipe 7 extends circumferentially around the valve seat 5. The float is attached to the bottom of the water tank 2 via a plurality of stems 6 arranged on the outside in the radial direction of the float. This stem 6 prevents foreign matter from getting caught between the valve body and the valve seat, and allows dirt clogging in the stem itself to be directly observed from above and easily removed.

An annular float 8 is provided around the guide tube 7 so as to be movable up and down. The guide tube 7 is further attached with an outer cylinder 9 and a bottom plate 10, which together with the guide tube constitute a container. A bleed hole 11 is formed in the lower part of the outer cylinder 9. This bleed hole 11 prevents water in the water tank from immediately entering the container partitioned by the outer cylinder 9.

A valve rod 12 is inserted into the guide tube 7 so as to be movable up and down by a bearing 13, and a valve seat 5 is attached to the lower end of the valve rod.
a valve body 1 capable of engaging with and closing the open end of the inlet pipe 3;
4 is installed. The upper end of the valve stem projects above the guide pipe, and a link holder 15 is attached thereto.
is installed. The method for attaching the link holder 15 is as follows: A claw portion 18 protruding inward in the radial direction of the link holder 15 is inserted into the annular groove 17 at the upper end of the valve stem 12.
The position can be adjusted using an adjustment bolt 16 screwed into the link holder.

A pair of brackets 20 are arranged at diametrically symmetrical positions on the upper part of the guide tube 7, and a lever 21 is rotatably attached to each of the brackets. One end of a link 22 is pivotally connected to one end of each lever 21, and the other end of the link 22 is pivotally connected to the float 8. Further, one end of a link 23 is pivotally connected to the other end of each lever 21, and a link holder 15 is pivotally connected to the other end of the link 23. Therefore, when the float 8 is in the lower position close to the bottom plate 10 as shown in FIG.
2 and the valve body 14 are lifted, and the valve body 14 is separated from the valve seat 5 to open the open end of the inlet pipe.
When the float 8 rises, the valve stem 12 and the valve body 14 descend via the lever 21 and the links 22 and 23, and the valve body restricts the flow from the inlet pipe 3 into the water tank, and the valve body engages with the valve seat. When this occurs, the flow of water will be completely stopped.

A partition wall 26 is formed on the bottom 25 of the water tank 2 between the open end of the inlet pipe 3 and the open end of the outlet pipe 4, projecting upward and partitioning the bottom of the tank into two chambers 27 and 28. ing. A weir 30 of a known structure is provided in contact with the partition wall 26 so as to be movable up and down. This weir 30 is provided, for example, at the top of the water tank and the motor 3
The chamber 27 is moved up and down by a screw shaft 32 rotated by a screw shaft 32 by a known method, so that the water level in the chamber 27 can be changed.

As shown in FIG. 2, for example, the float valve device 1 has an inlet pipe 3 connected to a primary side waterway (high pressure side) A, and an outlet pipe 4 connected to a secondary side waterway (low pressure side) B.
used in connection with the secondary waterway to reduce water pressure in the secondary waterway.

In the above configuration, when there is no water in the water tank and the float 8 is lowered and the valve body 14 is separated from the valve seat 5, water flows into the chamber 27 of the water tank 2 from the inlet pipe 3. Then, the water level in the chamber 27 rises and the water surface reaches the weir 30.
Once it crosses the upper edge, it flows over the weir 30 and into the chamber 28,
It flows out via the outlet pipe 4. On the other hand, aquarium chamber 27
When water accumulates inside, the water gradually enters the outer cylinder 9 through the bleed hole 11, the water level therein gradually rises, and the float 8 also begins to rise. When the float 8 begins to rise, the lever 21 and the link 2
2 and 23, the valve stem 12 begins to descend, and the valve body 14 also begins to descend toward the valve seat 5, and the float 8 rises to a height determined by the water level in the chamber 27, which is determined by the height of the weir 30. Then stop and close the valve body 14.
The descent also stops. Therefore, the flow rate flowing into the chamber 27 of the water tank 2 from the open end of the inlet pipe 3 is reduced by the valve body 14.
The flow rate is limited to the amount determined by the opening position of the valve. When the weir 30 is raised and the water level in the chamber 27 rises, the float 8 rises accordingly, so the valve body 14 descends accordingly, and the water level from the inlet pipe 3 to the chamber 27 rises.
The amount of water flowing into the area also decreases. Then, with the valve body 14 engaged with the valve seat 5, the flow is completely stopped.

During the lowering and closing operations of the valve body, the force of the water pushing up the valve body 14 increases as the valve body approaches the valve seat, so the force of the float 8 pushing down the valve body must also increase accordingly. There is. The device of the present invention uses a toggle mechanism consisting of a lever 21 and links 22, 23 to
(F is the force pushing down the valve body, and f is the buoyant force due to the float.) The force becomes larger when the valve body is in contact with the valve seat as shown in FIG. 3, which meets the above requirements.

(g) Effects The float valve device of the present invention can provide the following effects.

The valve body and valve seat are placed in the center of the float, making the device more compact.

A toggle mechanism using a lever and link increases the force pushing down the valve body when the valve is closed, so the float can be made smaller.

Since the float is placed inside the container and the water in the tank is introduced into the container through the bleed hole, it is possible to prevent the float from rising rapidly and suddenly closing the valve, thereby preventing the water hammer phenomenon. can.

In the embodiment, the stem was placed radially apart from the valve body and on the outside of the float in the radial direction.
It is possible to prevent foreign matter from getting caught between the valve body and the valve seat, thereby preventing leakage, and also to be able to observe debris clogging in the stem from above, allowing debris to be removed at an early stage.

Since the stroke of the float is very large relative to the opening degree of the valve, the maximum water flow rate determined by the water line of the float and the weir height can be set with high accuracy.

By simply adjusting the height of the weir, water can be supplied and stopped from the primary waterway.

By simply adjusting the height of the weir, it is possible to avoid sending more than the maximum amount of water for each period, and avoid uneven water distribution caused by ``too much water''.

If the demand for water in the downstream area is low, the water level in the tank will rise, the float valve will close, and the water will eventually be shut off, contributing to water conservation without wasting water.

It can be used as a pressure reducing device to temporarily release the pressure in the pipe channel to the atmosphere, and low-cost, low-pressure piping materials can be used.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the float valve device for waterways according to the present invention, Fig. 2 is a diagram showing an example of use of the float valve device of Fig. 1, and Fig. 3 is the distance of the valve body from the valve seat. FIG. 4 is a cross-sectional view of a conventional float valve device. 1: automatic pressure reducing device, 2: water tank, 3: inlet pipe,
4: Outlet pipe, 5: Valve seat, 7: Guide pipe, 8: Float, 9: Outer cylinder, 10: Bottom plate, 11: Bleed hole,
12: Valve stem, 14: Valve body, 21: Lever, 22,
23: Link, 25: Bottom, 27, 28: Chamber, 2
6: Bulkhead, 30: Weir.

Claims (1)

[Scope of Claims] 1. A water tank with an inlet pipe and an outlet pipe connected to the lower part, a float provided in the water tank, and a float connected to the float that controls the inlet pipe according to the vertical movement of the float. In a float valve device for a waterway equipped with a valve body for opening and closing an open end, a guide tube extending vertically above the open end of the inlet pipe is installed in the water tank so that its axis substantially coincides with the center of the open end. The float is arranged around the guide tube so as to be movable up and down and connected to one end of a lever provided at the top of the guide tube, and the valve body is connected to the open end of the inlet tube and the guide tube. For a waterway, the valve body is attached to the lower end of a valve rod movably provided within the guide pipe, and the valve rod is connected to the other end of the lever. Float valve device. 2. A water tank with an inlet pipe and an outlet pipe connected to the lower part, a float provided in the water tank, and a valve connected to the float that opens and closes the open end of the inlet pipe in accordance with the vertical movement of the float. a float valve device for a waterway, which is provided with a guide tube extending vertically above the open end of the inlet pipe in the water tank so that its axis substantially coincides with the center of the open end;
The float is arranged around the guide tube so as to be movable up and down and connected to one end of a lever provided at the upper part of the guide tube, and the valve body is connected between the open end of the inlet tube and the lower end of the guide tube. The valve body is attached to the lower end of a valve stem movably provided in the guide pipe, and the valve stem is connected to the other end of the lever, and the float is attached to the guide pipe together with the guide pipe. 1. A float valve device for a waterway, characterized in that a bottom plate and an outer cylinder are attached to define a container for accommodating the waterway, and a bleed hole is formed in the lower part of the outer cylinder. 3. A water tank with an inlet pipe and an outlet pipe connected to the lower part, a float provided in the water tank, and a valve connected to the float that opens and closes the open end of the inlet pipe in accordance with the vertical movement of the float. In the waterway float valve device, a guide tube is disposed in the water tank and extends vertically above the open end of the inlet pipe so that its axis substantially coincides with the center of the open end, and A float is arranged around the guide tube so as to be movable up and down, and connected to one end of a lever provided at the top of the guide tube, and the valve body is placed between the open end of the inlet tube and the lower end of the guide tube. The valve body is attached to the lower end of a valve stem movably provided in the guide pipe, the valve stem is connected to the other end of the lever, and the open end of the inlet pipe is attached to the bottom of the water tank. A float valve device for a waterway, characterized in that a partition wall extending upward is provided between the opening end of the outlet pipe and a weir is provided adjacent to the partition wall so as to be movable up and down.