JPH0444688Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to an improvement of a flash valve with an antifreeze function.

(Prior Art) In order to prevent the flash valve from freezing in cold regions, there is a conventional flash valve shown in FIG. 2 that allows water to be drained from the valve.

To briefly explain Fig. 2 above, in order to drain water to prevent freezing, first shut off the water stop valve 50, and then unscrew the water volume adjustment shaft 51 to introduce outside air into the pressure chamber 52. and push button 53
When you press , the starting valve 55 inside the valve body 54 opens,
The remaining water in the pressure chamber 52 and the primary flow path 56 is removed to the secondary flow path 57.

In the case of the above, the water volume adjustment shaft is normally set to optimize the amount of water discharged from the flush valve, but when the adjustment shaft is turned in the unscrewed direction to drain water to prevent freezing, When using the flush valve again the next day, the adjustment shaft had to be readjusted, and the operation was extremely troublesome, resulting in the drawback of neglecting to drain water.

(Problem to be solved by the invention) The problem to be solved by the invention is that when draining water from the flush valve, outside air can be introduced into the pressure chamber of the flush valve without operating the adjustment shaft. It is to do so.

(Technical means for solving the problems) The technical means adopted by the present invention for solving the above problems is a flush valve in which a water supply chamber and an operating chamber are connected via a first valve seat port, and a piston is disposed in the water supply chamber with its stroke length regulated by an adjustment shaft screwed through the cap, wherein a first air hole is provided in the cap which forms a pressure chamber which can freely expand and contract between the piston, and a cover is screwed onto the top of the cap, the cover passing through an insertion hole for operating the adjustment shaft, and by unscrewing the cover, outside air can be introduced into the pressure chamber from the insertion hole via the first air hole.

(Function) To drain water to prevent the flash valve from freezing, unscrew the cover to introduce outside air into the pressure chamber through the first air guide hole of the cap, and then press the push button. When the operating valve of the piston is opened, the remaining water in the pressure chamber and water supply chamber is discharged into the toilet bowl through the operating chamber and the vacuum breaker.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

As shown in FIG. 1, the flush valve 1 includes a pressure chamber 3 whose upper portion (in the figure) is closed with a cap 2, and a piston 4 that maintains the pressure chamber 3 so as to be able to expand and contract in a water supply chamber 5. The water supply chamber 5 and the working chamber 6 are communicated through a first valve seat opening 7, and a vacuum breaker 10 is connected to the threaded portion 8 of the working chamber 6 via a connecting pipe 9. The cap 2 is arranged so as to regulate the upper limit of the stroke of the piston 4 by screwing an adjustment shaft 12 into a screw hole 11 in the center, and also has a first air guide hole 13 in the radial direction of the screw hole 11 in the vertical direction. The first air guide hole 13 is provided so as to communicate with the insertion hole 15 of the cover 14 attached to the threaded portion 8a of the cap 2 during draining. The check valve chamber 16 communicates with the water supply source on one side via the second valve seat opening 7a, and on the other side communicates with the water supply chamber 5 via a purification chamber 19 provided with a lid 18 having a strainer 17. The check valve 20 that opens and closes the 2-valve seat port 7a has a shaft end connected to a plug 21.
The plug 21 is supported in a suspended manner in the bottom hole 22 of the plug 21, and a second air guide hole 13 is provided below the threaded portion 8b of the plug 21.
a is formed in the shape of an axial groove, and by unscrewing the plug 21 when draining water, it communicates with the check valve chamber 16 and indoor piping (not shown) communicating therewith so as to introduce outside air. . A water inlet 2 is provided in the seat 25 of the main body 24 connected to the vacuum breaker 10.
Attach the fixed plate valve 27 through which a plurality of valves 6 pass through,
A movable plate valve 30 having a large-diameter water outlet 29 is interposed between the fixed plate valve 27 and the lower seat 28 so as to be movable up and down. It is provided. The water receiver 31 has a rising portion 3 having an inner diameter larger than the outer diameter of the main body 24.
2 and a bottom part 33, the upper edge of the rising part 32 forms an upward small opening 34, and the male threaded part 23a of the main body 24 is connected to the lower female threaded part 23, and the small opening A cover 35 having a large opening 34a having a larger diameter than the small opening 34 facing downward is arranged above the small opening 34 to form a water leakage prevention means A.

Note that the operating valve 36 of the piston 4 is connected to the operating rod 3.
The valve is normally opened by applying pressure with the push rod 38 to the piston 7, and the pressure chamber 3 and the water supply chamber 5 are connected to the communication hole 3 of the piston 4.
It is connected by 9.

Now, when the push button 40 is operated to open the operating valve 36 in order to clean the toilet bowl, the water that was filled in the pressure chamber 3 during the previous water discharge will flow out into the operating chamber 6 as shown by the arrow in Figure 1. . Due to the reduced pressure in the pressure chamber 3 due to this water discharge and the internal pressure in the water supply chamber 5, the piston 4
operates in the valve opening direction to open the first valve seat port 7, and due to this valve opening operation, the check valve 20 in the check valve chamber 16 opens.
is activated by water pressure and opens the second valve seat 7 as usual.
a is opened, the fluid leading to the water supply flows from the check valve chamber 16 through the strainer 17 to the water supply chamber 5, passes through the first valve seat opening 7 and the working chamber 6, and enters the vacuum breaker 10. flowing down to the fixed plate valve 27
water inlet 26 is reached. At this time, the movable plate valve 30 is
Since it is pressed against the seat 28 of the body 24 by water pressure, the fluid flowing out from the water inlet 26 is continuously discharged into the toilet bowl via the water outlet 29 of the movable plate valve 30. During the discharge of the fluid, a part of the fluid flows through the communication hole 3.
9 into the pressure chamber 3, and its internal pressure gradually pressurizes the piston 4 toward the first valve seat opening 7, closing the first valve seat opening 7, and at the time of this closing. The fluid is discharged in a preset amount necessary for one flush of the toilet, but if negative pressure is generated in the vacuum breaker 10 for some reason after the fluid is discharged, the inside and outside of the vacuum breaker 10 Due to the pressure difference generated, the movable plate valve 30 is displaced upward and closes the water inlet 26 of the fixed plate valve 27. By this operation, the inside of the water receiver 31 and the inside of the lower part of the vacuum breaker 10 are connected through the bottom hole 22a, and outside air is introduced, thereby breaking the vacuum in the drain pipe leading to the toilet bowl through the bottom hole 22a. Prevent backflow of sewage. When the movable plate valve 30 rises from the seat 28 due to the operation of the movable plate valve 30, a small amount of water remaining on the seat 28 is drained from the bottom hole 22a to the water receiver 31.
The remaining water falls inside and is stored, and is removed to the drain pipe together with the outside air each time the air is introduced next time, so the remaining water does not overflow from the small opening 34 of the water receiver 31.

Next, when draining water to prevent freezing,
First, as in the normal case, the master valve installed on the indoor piping is turned to the closed side to shut off the water pipe and the indoor piping, and the indoor piping is connected to the drain. Next, the cover 14 in Fig. 1 is turned in the unscrewing direction to connect the insertion hole 15 and the first air hole 13, and outside air is introduced into the pressure chamber 3 so that the pressure chamber 3 does not become negative pressure. Then, the push button 40 is pressed to open the operating valve 36, and the remaining water in the pressure chamber 3 and the water supply chamber 5 flows into the operating chamber 6 and is discharged into the toilet bowl via the vacuum breaker 10. The plug 21 is then unscrewed to connect the screwed portion 8b and the second air hole 13a.
By introducing outside air into the check valve chamber 16, residual water in the check valve chamber 16 and the indoor piping is discharged to the outside through the drain.

(Effects) Since this invention has the above configuration, it has the following advantages.

(1) A first air guide hole is provided in the cap into which the adjustment shaft for setting the displacement amount of the flush valve is screwed, and a cover is screwed onto the top of the cap, which is provided through the insertion hole for operating the adjustment shaft. However, by unscrewing the cover, outside air can be introduced into the pressure chamber from the insertion hole through the first air guide hole, so outside air can be introduced without operating the adjustment shaft when draining water to prevent freezing. There is no need to readjust the drainage amount when using the flush valve the next morning.

(2) In order to introduce outside air into the pressure chamber to drain water from the flush valve, it is only necessary to unscrew the cap, and when reusing the flush valve, the cap must be returned to its original position. The optimum flow rate of fluid can be discharged simply by returning the valve to the original position, making it extremely easy to operate.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a flush valve equipped with the present invention, and FIG. 2 is an explanatory diagram of the prior art. Explanation of symbols of main parts, 1...Flash valve, 2...Cap, 3...Pressure chamber, 4...Piston, 5...Water supply chamber, 6...Working chamber, 7...First
Valve seat port, 12...adjustment shaft, 13...first air guide hole,
14... Cover, 15... Hole insertion.

Claims (1)

[Scope of utility model registration request] A water supply chamber 5 and an operating chamber 6 are communicated with each other across a first valve seat opening 7, and a piston 4 is connected to a cap 2 in the water supply chamber 5.
In the intervening flash valve whose stroke length is regulated by an adjustment shaft 12 screwed through the cap 2, a first Air guide hole 13
A cover 1 is provided on the top of the cap 2 and is provided through an insertion hole 15 through which the adjustment shaft 12 is operated.
4 is screwed on, and by unscrewing the cover 14, outside air can be introduced into the pressure chamber 3 from the insertion hole 15 through the first air introduction hole 13. Prevention device.