JPH0244143Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a disc valve for opening and closing an opening at the end of a water conduit from a water storage dam or the like led into a water storage tank.

[Prior art]

Conventionally, a disc valve installed in a water storage tank is configured to open and close an opening at the end of a water conduit pipe by a float that moves up and down in a float chamber in the water storage tank according to fluctuations in the water level. The inside of the tank and the inside of the water tank are communicated through a communication port, and the water level is always maintained at the same level.

[Problems that the invention aims to solve] However, with conventional disc valves, when the water level in the water tank approaches the maximum water level, the opening degree of the disc valve becomes small, and the amount of outflow from the water conduit end opening is small. As a result, the water level in the water storage tank rises very slowly, resulting in a problem that the small opening continues for a long time and cavitation occurs.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention allows the upward opening of the water conduit provided in the water storage tank to be opened using a lever by vertical movement of the main float in the float chamber provided in the water storage tank. and a disc valve which is opened and closed by a valve body through a valve rod, in which a sub-float chamber with open upper and lower ends is erected adjacent to the float chamber, and the sub-float chamber and the float chamber are connected to each other. The lower part of the bar is communicated by a water pipe, and the lower end opening/closing valve of the sub-float chamber is connected to the sub-float by a connecting rod, and the upper end of the sub-float chamber is located a predetermined length below the highest set water level. It was forced upon me. Therefore, according to this invention, as the water level rises, water in the water tank flows from the lower end opening of the sub-float into the float chamber through the sub-float chamber and the water pipe, and drains the main float. When the water reaches a predetermined water level below the maximum set water level, stored water suddenly flows in from the upper end opening of the sub-float chamber, causing the main float and sub-float to rise rapidly, and the valve body suddenly closes the water conduit end opening. The opening/closing valve closes the lower end opening of the sub-float, and as a result, the minute opening time of the disc valve can be significantly shortened, thereby suppressing the occurrence of cavitation. Conversely, when the water level decreases, the inflow of stored water from the top opening of the sub-float chamber stops, the balance between the water pressure inside and outside the sub-float chamber is disrupted, and the weight of the sub-float causes the opening/closing valve to descend, causing the sub-float chamber to close. The lower end opening is opened, the water in both float chambers flows into the water tank, the main float is lowered and the valve body is pulled up, and water is introduced from the water pipe into the water tank away from the upward opening of the water pipe. and the water level rises again.
In this way, the disc valve is automatically opened and closed in accordance with the water level in the water tank.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

In the drawing, 1 is a water tank, 2 is a water pipe led from a water storage dam etc. (not shown), 3 is a valve seat provided at the upward opening end of the water pipe, 4 is a valve body, and 5 is a valve rod. be. 6 is a cross beam constructed above the water surface of the water tank 1; 7 is a disc valve opening/closing lever; and 8 is a disk valve opening/closing lever support base mounted on the cross beam 6; It is swingably supported via a horizontal shaft 9. The upper end of the valve rod 5 is pivotally attached to one end of the opening/closing lever 7 via a horizontal pin 10 parallel to the horizontal axis 9, and the suspension rod of the main float 11 is attached to the other end of the opening/closing lever 7. The upper end of 12 is pivotally connected via a horizontal pin 13. Reference numeral 14 indicates a float chamber, and reference numeral 15 indicates a sub-float chamber, both of which are erected close to each other and parallel to each other in the water storage tank 1, and their lower parts are connected by a water pipe 16 so that water can flow between them. A main float 11 and a sub-float 17 are housed in both chambers 14 and 15 so as to move up and down depending on the water level.

The sub-float chamber 15 is made of a cylindrical body with its upper and lower ends opened, and the lower end has a space between it and the bottom surface 1A of the water tank 1 to provide sufficient valve opening/closing interval, and the upper end has a space between the bottom surface 1A of the water storage tank 1 and the upper end of the float chamber 14. The sub-float chamber 15 is lower than the upper end and a predetermined height lower than the highest set water level HWL.
The stored water flows into the interior from the upper part and all at once the main float 1
1 floats up and rapidly lowers the valve body 4 to close it.

Reference numeral 18 denotes an opening/closing lever stopper, which is attached to the cross beam near the support base 8, whose position can be adjusted using a screw mechanism, and which regulates the lower limit of the main float 11. Therefore, the main float 11 moves up and down within the float chamber 14 within a predetermined water level range according to changes in the water level to open and close the disc valve. Reference numeral 19 denotes a valve rod guide, which is attached to the upper end of the water conduit 2 by a mounting member 20.

Reference numeral 21 denotes a cone-shaped opening/closing valve for opening and closing the lower end opening of the sub-float chamber 14, and is attached to the lower end threaded portion of the connecting rod 22 with nuts 23 and 24 so that its mounting position can be adjusted. Connecting rod 2
2 is vertically slidably supported by a guide 25 in the lower part of the sub-float chamber 15,
A threaded portion is provided at the upper portion, passing through the sub-float 17, and is attached with nuts 26, 27 so that the attachment position can be adjusted. Reference numeral 28 denotes a sub-float stopper provided within the sub-float chamber 15, which prevents the sub-float 17 from descending below a predetermined water level.

As shown in FIG. 2, the sub-float chamber 15 has a spout body 15A whose upper end opening is widened in the shape of a flap, and a bracket 15B attached to the outside of the sub-float chamber 15.
The sub-float chamber 15 is height-adjustably mounted with a bolt 15C and a nut 15D, and an O-ring 15E is attached to the inner circumferential surface of the upper opening of the sub-float chamber 15 to ensure water tightness with the spout body 15A. Therefore, the minimum opening degree of the disc valve can be set and finely adjusted as desired, and cavitation can be completely eliminated.

In addition, 29 is a guide attached to the outer periphery of the sub-float 17, and 30 is a water outflow pipe of the water tank 1, which is aligned with the lowest water level.

As shown in FIGS. 3 to 5, when the water in the water tank 1 is at the highest set water level, the water level in the float chamber 14 is lower than the water level in the water tank 1. The main float 11 is also at its upper limit, and the valve body 4 of the disc valve is at its lower limit, that is, the opening of the water conduit 1 is closed, preventing water from flowing out of the water conduit 1.
Therefore, as the water flows out from the outflow pipe 30, the water level decreases, and the spout body 15 of the sub-float chamber 15
From the water pressure acting on the lower surface of the opening/closing valve 21 in the water storage tank 1 due to the collapse of the pressure balance due to the difference between the water level in each float chamber 14, 15 and the water storage tank 1, which decreases downward from the upper edge of A. Also, the internal water pressure of float chambers 14 and 15 and the sub-float 1
7 etc. becomes larger, the opening/closing valve 21 is lowered, the lower end of the sub-float chamber 15 is opened, and the water in each float chamber 14, 15 flows out into the water storage tank 1. Therefore, the main float 11 descends, the valve body 4 rises, the water conduit 2 is opened, and dam water, etc. flows into the water tank 1 (see FIG. 5). At this time, the main float 11 and the sub-float 17 are in the positions shown by the two-dot chain lines in FIG.
Next, when the water level in the water tank 1 rises from the low water level state shown in FIG. 5, the water in the water tank 1 flows into both float chambers 14 and 15 from the lower end of the sub-float chamber 15. When the water in the water storage tank 1 exceeds a predetermined water level, both floats 11 and 17 start to rise, the opening degrees of the valve body 4 and the on-off valve 21 become smaller, and the water level further rises, causing the sub-float chamber 15 to rise. After passing the upper end of the spout body 15, the stored water flows in from the upper edge of the spout body 15A as shown in FIG. , suddenly each float chamber 1
4, 15 suddenly rises to become the same as the water level in the water tank 1, the main float 11 rises, the valve body 4 is pushed down, and sudden closure is performed.
The state shown in the figure is reached, and the water no longer flows out from the water pipe 1, and the water in the water tank 1 is at the maximum set water level.
Never exceed HWL. Therefore, the minute opening time is extremely short.

〔effect〕

Since the disc valve according to this invention has the above-described configuration, the valve body is automatically and rapidly lowered to close the water conduit end opening near the maximum set water level of the water tank where the valve opening becomes small, The minute opening range can be made instantaneously for a short period of time, and therefore cavitation caused by the minute opening near the highest water level in the water tank can be completely prevented.

[Brief explanation of drawings]

The drawings show an embodiment of this invention: Fig. 1 is a vertical front view, Fig. 2 is a longitudinal side view showing the upper structure of the sub-float chamber, Fig. 3 is a diagram of the blockage state at the highest water level, and Fig. FIG. 4 is a diagram of the valve opening state before the highest water level, and FIG. 5 is a diagram of the valve opening state at a low water level. 1...Water tank, 2...Water pipe, 3...Valve seat, 4
... Valve body, 5 ... Valve rod, 7 ... Valve opening/closing lever, 8 ... Support stand, 9 ... Horizontal shaft, 10 ... Horizontal pin, 11 ... Main float, 13 ... Horizontal pin,
14...Float chamber, 15...Sub float chamber, 16...Water pipe, 17...Sub float, 21...Open/close valve, 22...Connection rod, HWL...Highest set water level, 30...Flowing water tube.

Claims (1)

[Scope of utility model registration request] The upward opening of a water conduit provided in a water storage tank is opened and closed by a valve body via a lever and a valve rod by vertical movement of a main float in a float chamber provided in the water storage tank. In the disc valve, a sub-float chamber with open upper and lower ends is erected adjacent to the float chamber, and a water pipe communicates between the sub-float chamber and a lower part of the float chamber, and the sub-float chamber A disc valve characterized in that a lower end opening/closing valve and a sub-float are connected by a connecting rod, and the upper end of the sub-float chamber is positioned below a maximum set water level by a predetermined length.