JPS6065976A - Intermittently operating float-valve - Google Patents

Abstract

PURPOSE:To make it possible to completely substitute water in a cylinder containing a float with air, by surrounding the lower end of the cylinder with an ejector wall member to define a chamber which is communicated with the atmosphere through a ventilating port so that an ejector mechanism utilizing discharged water as drive water is formed. CONSTITUTION:A float valve comprises a main water supply valve 21, a cylinder 2 surrounding this valve 21 and extending downward, a float 4 disposed in the cylinder 2, a pilot valve 10 actuated by the float 4, a U-pipe 6 and an ejector wall member 3 attached to the lower end opening of the cylinder 2. Further, the main water supply valve 21 is opened and closed in accordance with changes in pressure in a pressure control chamber 20 which are caused by opening and closing a pilot valve 10. With this arrangement, upon opening of the main water supply valve 21 water in a chamber 19 surrounded by the ejector wall member 3 is sucked out by flow from a discharge pipe 5 so that the water level in the chamber 19 is below the lower end of the cylinder 2. Accordingly, water in the cylinder 2 may be completely substituted with air which is introduced from a ventilating passage 18 in the ejector passage wall member 3.

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, the float moves up and down continuously in response to changes in the water level in the tank, and the opening degree of the water supply valve changes continuously.
Equilibrium is reached at the valve opening position corresponding to the amount of water discharged from the tank, and the valve is repeatedly opened and closed in small increments at this position. This micro-oscillatory operation is particularly noticeable in large-capacity pilot-operated 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 two levels, 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 zero-shaped tube.

This will be explained with reference to FIG. A downwardly open cylinder 103 is arranged at the end of the water supply pipe 101, and a float 10 is placed inside the cylinder 103.
Accommodates 7. 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. U-shaped tube 10
One end of the pipe 5 is communicated with the upper part of the cylinder 103, and a water container 106 for sealing the water is attached to the loose end. A thin pipe 104 is provided that leads part of the water on the outlet side of the main valve 102 to a receiver 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 the water supply, the water level inside the tube 103 cannot rise because the air inside is sealed off by the U-shaped tube 105. Therefore, the float 107 also does not rise, 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. Further, even when the water level in the tank falls, the water level inside the cylinder does not fall because air cannot be supplied to the inside of the cylinder 103 due to the water sealing action of the U-shaped tube 105.

Then, when the water level outside the cylinder 103 falls below the lower end, air enters around the opening at the lower end, the water level inside the cylinder falls all at once, and the float 107 descends accordingly, causing the pilot valve 108 The main valve 102 is opened via the main valve 102, and the water supply is resumed.

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, in the middle of air and water replacement, cylinder 10
This is because the lower end opening of No. 3 is blocked. That is,
Next time, the water level inside the cylinder 103 will start rising from a position higher than the lower end, so even if the water level in the tank reaches the receiver 106 at the upper end of the U-shaped tube 105, the water level difference L1 inside and outside the cylinder will be U-shaped. This is because the water seal of the pipe 105 is not larger than the height L2 of the water column, so the water seal cannot be broken.

Therefore, in order 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. Water is removed from the vicinity of the opening at the bottom of the tank to ensure complete air-water exchange.

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 housing the float with an ejector wall member; (3) Make an ejector structure that uses the water flowing out from the water supply pipe as driving water, and supply water from the room to the suction part. It is something designed to guide you.

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 will continue until the water level in the tank rises again and the vent opening is submerged. Of course, even after the vent opening is submerged, the ejector action of the water supply continues, and the water in the tank circulates between the vent opening, the chamber, and the ejector structure, but it 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 taken for complete air and water exchange in a downwardly open container consists of a wall member and an ejector structure, the ejector action is obtained by water supply, no other power is required, and the structure is simple. The 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 flows).

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

The casing of the main water supply valve is made by attaching to the main body 12 an inlet side end member 1 forming an inlet 16 and an outlet side outflow pipe 5 forming an outlet 17. A partition member 13 and a cylindrical screen 1 are provided between the inner back wall of the main body 12 and the inner wall of the inlet side end member 1.
Arrange 4 in a row. The partition member 13 has a two-stage cylindrical cup shape, and a hole is formed in the peripheral wall of each cylinder. Entrance 1
A screen 15 is placed around the large cylindrical hole near 6. The shoulders of both large and small barrels are rounded.

A valve tube 11 made of synthetic rubber is placed surrounding the small cylinder of the partition member 13 and the screen 74. The flange at one end of the valve tube 11 is sandwiched and fixed between the step wall inside the main body 12, the inner end wall of the inlet side end member 1, and the shoulder of the large cylinder of the partition member 13. The other end of the valve tube 11 is a free end and slides on the outer periphery of the cylindrical wall extending from the screen 14 .

Pressure control chamber 2 between the inner peripheral wall of the main body 12 and the valve tube 11
0 through the inlet pore in which the check valve 19 is placed
through the outlet hole in which the pilot valve 10 is placed.
It communicates within.

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 portion at the lower end of the outer periphery of the main body, and water can be stored in the space on 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 U-shaped tube 6 is opened at the bottom of this space.

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 being pulled out 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.

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

The opening and closing operation of the main valve 21 is performed 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 is closed and the valve is closed.

When the valve is opened, a portion of the water flows out into the space around the outer periphery of the main body 12 through the pores 8, and 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 outside of the wall portion l713. This creates a state in which the cylinder 2 is lower than the lower end of the cylinder 2. Therefore, the water in the cylinder 2 is completely replaced with air.

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[Brief explanation of drawings]

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: Cylinder 3: Ejector wall member 4: Float 6: O-shaped pipe 10: Pilot valve 16 Two ports 17: Outlet 18: Ventilation opening 19: Room surrounding the lower end of the pipe 21: Water supply main valve Patent applicant 11-

Claims (1)

[Claims] (1) The float is housed in a downward-opening cylinder equipped with a zero-shaped tube, and the float is moved up and down intermittently in response to changes in the water level in the tank, and the valve is intermittently opened and closed at two predetermined water levels in the tank. In the float valve, the lower end of the cylinder is surrounded by an ejector wall member to form a chamber, and the chamber is communicated with the outside air through a ventilation opening located above the lower end to drive water flowing out from the water supply pipe. Create an ejector structure for water, and use an intermittent-operating float valve to guide the water in the room to the suction part.