JPS6234997B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a float valve that automatically supplies water to maintain a predetermined water level in a tank, and in particular, the present invention relates to a float valve that automatically supplies water to a tank so as to maintain the water level at a predetermined level. This invention relates to a float valve in which a float is moved up and down intermittently in response to changes in the water level of a tank, and the valve is opened and closed intermittently at two predetermined water levels in the tank.

Technical background In a float valve, where the float moves up and down continuously in response to changes in the water level of the tank, and the opening degree of the water supply valve is continuously changed, an equilibrium state is reached at the valve opening position corresponding to the amount of water drained from the tank. At this position, repeat the small opening and closing of the valve. This micro-oscillatory operation is particularly noticeable in large capacity pilot float valves. For this reason, the valve portion is subject to severe wear and has poor durability. Therefore, it is desirable that the float valve be opened and closed intermittently at the upper and lower water levels of the tank.

Prior Art and its Problems Therefore, attempts have been made to house a float in a downwardly open cylinder equipped with a U-shaped tube.

This will be explained with reference to FIG. Water supply pipe 10
A downwardly open cylinder 103 is arranged at the end of the cylinder 1, and a float 107 is housed in the cylinder 103. A water supply main valve 102 is attached to a water supply pipe 101, and a pilot valve 108 for controlling the main valve 102 is connected to a float 107 via a lever 109. One end of the U-shaped tube 105 is communicated with the upper part of the tube 103, and a water container 106 for a water seal is attached to the other end. A thin pipe 104 is provided that leads part of the water on the outlet side of the main valve 102 to a receiving tray 106.

This works as follows. That is, when the water level in the tank is below the tube 103, the float 107 is in the lowered position, so the main valve opens and water is supplied. Although the water level in the tank rises due to water supply, the water level inside the tube 103 cannot rise because the air inside is sealed with water by the U-shaped tube 105. Therefore, the float 107 does not rise either, and the water supply state with the valve open continues. Then, when the water level difference between the inside and outside of the tube 103 becomes larger than the water seal height of the U-shaped tube 105, the water seal is broken and the water level inside the tube 103 rises all at once, and the float 107 responds to this. The main valve 102 is closed via the pilot valve 108. Also, when the water level in the tank decreases, the U-shaped pipe 10
Because air cannot be supplied to the inside of the cylinder 103 due to the water sealing action in step 5, the water level inside the cylinder does not fall. and,
When the water level outside the cylinder 103 drops below the lower end, air enters around the opening at the lower end, causing the water level inside the cylinder to drop all at once, and in response to this, the float 10
7 is lowered and the main valve 1 is opened via the pilot valve 108.
02 opens and water supply resumes.

In this case, after the water supply is resumed, the water supply may not stop even if the water level in the tank reaches a predetermined high position. This is because when the water level in the tank falls and reaches the lower end of the cylinder 103, air flows into the cylinder through the opening at the lower end, the float 107 drops rapidly along with the water level in the cylinder, and the main valve 102 opens, but water supply immediately begins. Therefore, the opening at the lower end of the cylinder 103 is closed during the exchange of air and water. That is, next time,
Since the water level inside the tube 103 starts rising from a position higher than the lower end, the water level in the tank increases
This is because the water seal cannot be broken even if it reaches the saucer 106 at the upper end of the cylinder because the water level difference L1 between the inside and outside of the cylinder does not become larger than the height L2 of the water column of the water seal of the U-shaped tube 105. Therefore, to solve this problem, it is necessary to completely replace air and water through the opening at the bottom end of the cylinder.

Technical Problem The technical problem of the present invention is to prevent surrounding water from flowing into the bottom opening of the cylinder when the water level outside the cylinder housing the float falls and reaches the bottom end of the cylinder. Remove water from near the opening at the bottom of the
The goal is to completely replace air and water.

Technical Means The technical means of the present invention taken to solve the above-mentioned technical problems are as follows: (a) a chamber is formed by surrounding the lower end of the tube containing the float with an ejector wall member, and (b) the chamber is communicate with the outside air through a ventilation opening located above the bottom end of the cylinder, and (c) create an ejector structure that uses the water flowing out from the water supply pipe as driving water to guide water from the room to its suction part. It is something that has been done.

Action of technical means The operation of the above technical means is as follows.

Since the chamber surrounding the lower end of the tube communicates with the outside air through a ventilation opening located above the lower end of the tube and the ejector structure, the water level in the tank and the water level in the chamber drop simultaneously. When the tube descends to the bottom opening, air and water exchange begins through the bottom opening, the float descends rapidly, the water supply valve opens, and water supply begins immediately. Then, the water in the room is sucked into the ejector structure driven by the flow of the supplied water and discharged to the outside. At this time, the ventilation opening of the room is located above the water level of the tank. Therefore, the water level at the lower end of the cylinder is forced down and the water in the cylinder is completely replaced by air introduced through the ventilation opening. This condition continues until the water level in the tank rises again and the vent opening is submerged. Of course, even after the ventilation opening is submerged in water,
The ejector action of the water supply continues, with tank water circulating between the ventilation openings, chambers, and ejector structure, but is not involved in the air-water exchange action.

Unique effects The present invention produces the following unique effects.

The means of the present invention for complete air and water exchange in a downwardly open container consists of a wall member and an ejector structure, the ejector action of which is obtained by water supply, does not require any other power, and has a simple wall structure, is trouble-free, and can be manufactured at low cost.

DESCRIPTION OF EMBODIMENTS An embodiment illustrating a specific example of the above technical means will be described (see FIG. 1, arrows indicate fluid flow).

The float valves mainly include the water supply main valve 21 and the main valve 2.
1, a float 4 housed in the tube 2, a pilot valve 10 operated by the float 4, a U-shaped tube 6, and an ejector wall attached to the lower end opening of the tube 2. It consists of member 3.

The casing of the main water supply valve is attached to the main body 12, and the inlet 16
It is made by attaching an inlet side end member 1 which forms an outlet 17 and an outlet side outflow pipe 5 which forms an outlet 17. A partition member 13 and a cylindrical screen 14 are arranged in a line between the inner back wall of the main body 12 and the inner wall of the inlet side end member 1. The partition member 13 is in the shape of a two-stage cylindrical cup, and a hole is formed in the peripheral wall of each cylinder. A screen 15 is placed around the large cylindrical hole near the inlet 16. The shoulders of both the large and small cylinders are rounded.

A synthetic rubber valve tube 11 is placed surrounding the small cylinder of the partition member 13 and the screen 14. A part of the flange of the valve tube 11 is connected to the step wall inside the main body 12, the inner end wall of the inlet end member 1, and the partition member 1.
Place it between the shoulders of the large cylinder shown in step 3 and fix it. The other end of the valve tube 11 is a free end that slides on the outer periphery of the cylindrical wall extending from the screen 14.

A pressure control chamber 20 between the inner circumferential wall of the main body 12 and the valve tube 11 communicates with the inlet 16 through an inlet hole in which a check valve 19 is arranged and into the cylinder 2 through an outlet hole in which a pilot valve 10 is arranged. There is.

The flange portions at the upper and lower ends of the outer periphery of the main body 12 are in airtight contact with the cylinder 2, and the space therebetween is communicated with the outside air through a hole 7 made in the peripheral wall of the cylinder 2. The hole 7 is located above the flange at the lower end of the outer periphery of the main body,
Water can be stored in the space around the outer periphery of the main body. In other words, it becomes a water receptacle. This space communicates with the outlet side of the main valve 21 through the pore 8.
Moreover, one end of the bottom U-shaped tube 6 of this space is open. The other end of the U-shaped tube 6 opens into a space in the tube 2 in which the float 4 is accommodated at a position above the above-mentioned end.

The float 4 is arranged around the outlet side outflow pipe 5, and is prevented from coming off downward by a retaining ring attached to the lower part of the outflow pipe 5. The float 4 is connected to a pilot valve 10 by a lever 9.

Ejector wall member 3 attached to the lower end of the tube 2
consists of a cylindrical part with a larger diameter than the cylinder 2 and a tapered wall part with a downwardly opening opening of approximately the same diameter as the outflow pipe 5. It is fixed to the lower end of 2. The ventilation opening 18 at the upper end of the cylindrical portion is located above the lower end of the tube 2.

The main valve 21 is opened and closed by changing the pressure in the pressure control chamber 20 by opening and closing the pilot valve 10.
When the valve tube 11 expands (as shown), the valve opens, and when it contracts, the screen 14 closes and the valve opens.

When the valve is opened, a portion of the outflow water passes through the pores 8 to the main body 1.
The water flows out into the space around the outer periphery of the tube 2, and this is used for sealing the U-shaped tube 6.

When the main valve 21 is opened, water in the chamber 19 surrounded by the ejector wall member 3 is sucked out by the flow from the outflow pipe 5, and as shown in the figure, the water level in the chamber 19 is lower than the water level outside the wall member 3. This creates a state in which the cylinder 2 is lower than the lower end of the cylinder 2. Therefore, tube 2
The water inside is completely replaced with air.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a float valve according to the present invention, and FIG. 2 is a schematic sectional view of a conventional float valve. 2: tube, 3: ejector wall member, 4: float,
6: U-shaped pipe, 10: Pilot valve, 16: Inlet,
17: Outlet, 18: Ventilation opening, 19: Room surrounding the lower end of the cylinder, 21: Main water supply valve.

Claims (1)

[Claims] 1. A float was housed in a downward-opening cylinder equipped with a U-shaped pipe, and the float was moved up and down intermittently in response to changes in the water level of the tank, and the valve was opened and closed intermittently at two predetermined water levels in the tank. In a float valve, a chamber is formed by surrounding the lower end of the cylinder with an ejector wall member, and the chamber is communicated with the outside air through a ventilation opening located above the lower end of the cylinder, and the water flowing out from the water supply pipe is used as driving water. An intermittent-operating float valve with an ejector structure that guides water from the room to its suction section.