JPS6354094B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in flush valves used in piping for faucets, toilets, etc.

A conventional flush valve 1 has a structure as shown in FIG. That is, the partition wall 2a that separates the inside of the casing 2 into the inflow chamber 3 and the discharge chamber 4 has both chambers 3 and 4.
A main valve port 5 is opened to communicate with the main valve port 5. A piston valve 6 that opens and closes the main valve port 5 is slidably inserted into a main pressure chamber 7 formed on the inflow chamber 3 side, and also closes the main valve port 5. A starting valve port 8 is opened to communicate the main pressure chamber 7 and the discharge chamber 4 when the main pressure chamber 7 is in the air. Further, the piston valve 6 is formed with a throttle inflow passage 12 that communicates the inflow chamber 3 with the main pressure chamber 7 . The starting valve 9 that opens and closes the starting valve port 8 is biased by a spring 10 from the main pressure chamber 7 side to the starting valve port 8, and has a telescopic starting valve shaft 11 that projects into the discharge chamber 4. is provided. Further, on the inner wall surface forming the discharge chamber 4, an output end 13a of a starting operation means 13 for pressing the tip of the starting valve shaft 11 in a direction intersecting the axis A of the starting valve shaft 11 protrudes. It is set up.

In the conventional flush valve 1 configured as described above, as shown in FIG. opens to lower the internal pressure of the main pressure chamber 7, and the piston valve 6 opens.
is flowing into the main pressure chamber 7 due to the high water pressure in the inflow chamber 3.
It is instantly pushed up as shown in Figure B. Then,
The lower end of the starting valve shaft 11 rests on the output end 13a of the operating means 13, and automatically returns the starting valve 9 to close the starting valve port 8. The piston valve 6 gradually descends as the high-pressure water in the inflow chamber 3 flows into the main pressure chamber 7, which is in a low pressure state due to the weight of the piston valve 6, through the throttle inflow path 12. . Until the piston valve 6 closes the main valve port 8 (the state shown by the two-dot chain line in the figure), the inflow chamber 3
The high-pressure water inside the guide 14's notches 14, 14a...
The water then flows out into the discharge chamber 4 through the opened main valve port 5. However, the conventional flush valve 1
If a person unfamiliar with the operation operates the operating means 13 again while the piston valve 6 is lowering (that is, during flushing), the piston valve 6 will be moved into the main pressure chamber 7 as the starting valve 9 is reactivated. There was a drawback that it pushed up again instantly and flushed out more water than necessary.

SUMMARY OF THE INVENTION In order to solve the above-mentioned drawbacks, the present invention aims to provide a flush valve that can flush only a predetermined amount of water for one time without being affected by re-operation during flushing.

The present invention will be explained below based on the embodiment shown in FIG. The improvement of the flush valve 15 according to the present invention is that the push rod 18 of the starting operating means 16 is held in the starting position (the state shown in FIG. 4B) during flushing, and the starting operating means is held only immediately before or after the completion of the flashing. 16 push rod 18 to the starting position (Fig. 4B
3) to the standby position (the position shown in FIG. 3). A press rod 18 forming an output end 18a of the starting operation means 16 is slidably inserted into a cylinder 17 provided on the outside of the discharge chamber 4. The press rod 18 is formed with a pressure receiving surface 18b that presses the press rod 18 in the forward direction (in the direction of arrow C) in response to the detected water pressure introduced into the auxiliary pressure chamber 17a formed in the cylinder 17 as described later. has been done. Further, the pressing rod 18 is spring biased 2 in the backward direction (in the direction of arrow B) with a force smaller than the receiving force acting on the pressure receiving surface 18b.
It's 0. A dynamic pressure detection tube 21 is attached near the tip of the press rod 18, and the dynamic pressure detection port 21a and the auxiliary pressure chamber 17a are communicated via a passage 18c of the press rod 18. In addition, the dynamic pressure detection port 21a
Although the communication between the auxiliary pressure chamber 17a and the auxiliary pressure chamber 17a is not limited to the illustrated embodiment and is omitted from the illustration, a separate dynamic pressure detection tube is fixed in the discharge chamber 4, and the communication between the dynamic pressure detection tube and the auxiliary pressure chamber 17a is Of course, it is also possible to have a structure in which the pipes 17a and 17a are appropriately connected. The open chamber 17b formed on the side of the discharge chamber 4 in the cylinder 17 is configured to have the same pressure as the atmospheric pressure via the air holes 17c and 2c. Although the open chamber 17b is not shown in the drawings and is not made to have the same pressure as the atmospheric pressure, it is also possible to configure the open chamber 17b to have the same pressure as the static pressure of the flash water flow flowing inside the discharge chamber 4. In the figure, reference numeral 27 denotes rotation prevention means, and the rotation prevention means 27 is inserted into a groove 18d formed along the sliding direction on the outer periphery of the press rod 18 near the tip and into the groove 18d. The dynamic pressure detection port 21a is configured to maintain a position facing the flush water flow. A handle 19 for pressing the press rod 18 in the direction of arrow C is biased by a spring 23 in the direction of arrow B. In the figure, 24 and 25 are annular packings, and 26 is a filter.

Next, the effects of the flush valve 15 according to the present invention will be explained based on FIGS. 4A and 4B. As shown in FIG. A, the handle 19 of the starting operation means 16
When operated, the output end 18a of the press rod 18 presses the starting valve shaft 11 to open the starting valve port 8.
When the internal pressure of the main pressure chamber 7 decreases with the opening of the starting valve port 8, the piston valve 6 is instantly pushed up into the main pressure chamber 7 by the high water pressure within the inflow chamber 3. Then, as shown in Figure B, the lower end of the starting valve shaft 11 rests on the output end 18a of the operating rod 18, and
The starting valve 9 automatically returns to close the starting valve port 8.
The piston valve 6 gradually descends as the high-pressure water in the inflow chamber 3 flows into the main pressure chamber 7 via the throttle inflow path 12. And piston valve 6
Until the main valve port 8 is closed, the high-pressure water in the inflow chamber 3 is flushed into the discharge chamber 4 via the notches 14a, 14a, . . . of the guide 14 and the opened main valve port 5. In addition, while the flush continues until the piston valve 6 closes the main valve port 8, even if the handle 19 is released, the dynamic pressure of the flush water flow flowing in the direction of the white arrow D in the discharge chamber 4 presses the detection tube 21. The pressure rod 18 is guided into the auxiliary pressure chamber 17a through the pressure rod 17a and presses the pressure receiving surface 18b in the direction of arrow B against the spring bias 20, so that the pressure rod 18 does not move and maintains the state shown in FIG. 4B. Then, just before or after the piston valve 6 closes the main valve port 8, the dynamic pressure in the inflow chamber 3 becomes very small or zero, so the sub pressure chamber 17a
The pressure inside is reduced, and the press rod 18 automatically returns to the standby position as shown in FIG. 3 by the spring bias 20.

As described in detail above, the flash valve according to the present invention maintains the push rod in the starting position while the flash continues, and automatically returns the push rod only immediately before or after the end of the flash. To save water by reliably flushing only the amount of water for one flush without being affected by re-operating the handle has an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway diagram showing a conventional flush valve, FIGS. 2A and B are partially cutaway diagrams illustrating the same operation, and FIG. 3 is a partially cutaway diagram showing an embodiment of the flush valve according to the present invention. 4A and 4B are partial half-cut diagrams illustrating the same operation as above. 2... Casing, 2a... Partition wall, 3... Inflow chamber, 4... Discharge chamber, 5... Main valve port, 6... Piston valve, 7... Main pressure chamber, 8... Starting valve port, 9...
... Start valve, 10 ... Spring bias, 11 ... Start valve shaft, 12 ... Throttle inflow channel, 16 ... Operation means, 1
7...Cylinder, 17a...Sub-pressure chamber, 18...
...Press rod, 18a...Output end, 18b...Pressure receiving surface, 21a...Dynamic pressure detection port, 23...Spring bias.

Claims (1)

[Claims] 1 A main valve port is provided in the partition wall that separates the inside of the casing into an inflow chamber and a discharge chamber, which communicates the two chambers, and a piston valve that opens and closes the main valve port enters the main pressure chamber formed on the inflow chamber side. The piston valve is slidably inserted, and the piston valve has an activation valve opening that communicates the main pressure chamber and the discharge chamber, and a throttle inflow passage that communicates the main pressure chamber and the inflow chamber. The starting valve that opens and closes the starting valve port is biased from the main pressure chamber side toward the starting valve port, and
A telescopic starting valve shaft is provided that protrudes into the discharge chamber, and an inner wall surface forming the discharge chamber is pressed with a tip end of the starting valve shaft in a direction intersecting the axis of the starting valve shaft. In the flush valve in which the output end of the starting operating means is provided in a protruding manner, the pressing rod forming the output end of the starting operating means is slidably inserted into a cylinder provided on the outside of the discharge chamber, and The press rod is formed with a pressure receiving surface that receives the detected water pressure guided into the auxiliary pressure chamber formed in the cylinder and advances the press rod into the discharge chamber, and further,
The press rod is spring-biased in the backward direction by a force smaller than the receiving pressure acting on the pressure receiving surface, and the auxiliary pressure chamber is communicated with a dynamic pressure detection port opened in the discharge chamber. valve.