Abstract:
An automatic/manual double-function urinal flush valve comprising a first flush port sealed by an electromagnetic valve controlled diaphragm, a second flush port sealed by a press rod controlled oscillating rod, wherein the press rod is pressed down, during power failure, to oscillate the oscillating rod in opening the second flush port, through which a flow of water is discharged to flush a urinal.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to valves, and more particularly the present invention relates to a urinal flush valve which can be operated fully automatically as well as manually. 
     A variety of urinal flush valves are known and used in public lavatories. These urinal flush valves are generally gathered into three categories: manual control type urinal flush valves, time control type urinal flush valves, and a fully automatic control type urinal flush valves. A manual control type urinal flush valve is controlled to flush a urinal by a rotary knob or press button. Because a manual control type urinal flush valve does not work automatically, people may forget or have less willing to open it. A time control type urinal flush valve is automatically controlled to regularly flush a urinal at equal time interval. This time control type of urinal flush valve operates automatically, however, it wastes much water. A fully automatic urinal flush valve is generally controlled by a heat inductor or an urine or infrared detector to automatically flush a urinal. A heat inductor or urine detector controlled urinal flush valve may be triggered by false signals. An infrared detector controlled urinal flush valve produces high reliability, and therefore it is widely accepted. Furthermore, the common disadvantage of the fully automatic urinal flush valves is that they can not work without electric power supply. 
     SUMMARY OF THE INVENTION 
     The present invention has been accomplished to provide a urinal flush valve which can be operated fully automatically as well as manually. According to one aspect of the present invention, there is provided an automatic/manual double-function urinal flush valve comprised of a first flush port sealed by an electromagnetic valve controlled diaphragm, a second flush port sealed by a press rod controlled oscillating rod, wherein the press rod is pressed down, during power failure, to oscillate the oscillating rod in opening the second flush port, through which a flow of water is discharged to flush a urinal. According to another aspect of the present invention, a retainer is provided to limit the up stroke of the reciprocating rod of the electromagnetic valve smoothly. According to still another aspect of the present invention, a sound trap groove is made on the inside to reduce noises upon each up stroke of the reciprocating rod in opening the first water passage port. According to still another aspect of the present invention, a wire gauze filter is provided to filtrate impurities from intake water. According to still another aspect of the present invention, all the parts inside the casing of the urinal flush valve can conveniently fastened into place or removed for repair work. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a sectional view of the preferred embodiment of the urinal flush valve of the present invention; 
     FIG. 2 illustrates that the urinal flush valve has been set at the mode of automatic control; and 
     FIG. 3 illustrates that the urinal flush valve has been set at the mode of manual control. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIG. 1, the preferred embodiment of the urinal flush valve of the present invention is generally comprised of an electromagnetic valve 1, a diaphragm 2, a manual control knob 3, a manual flush control assembly 4, and a water flow rate regulating switch 5. The electromagnetic valve 1 is controlled to alternatively move a reciprocating rod 11. The reciprocating rod 11 is supported on a spring 13 and retained by a retainer 14 inside a sliding slot 15, having a water stopper 12, which is made from a flexible material, covered on the front end thereof. A sound trap groove 16 is made on the inside of the sliding slot 15 at the bottom to reduce noises upon each return stroke of the reciprocating rod 11. The diaphragm 2 which is fastened inside a diaphragm chamber 24 is comprised of a thin metal sheet 23 having a center hole 21 and an offset hole 22. The manual control knob 3 which is fastened to the casing of the urinal flush valve by a locknut 35 and supported on a spring 36 is comprised of a press rod 31 inserted through a hole (not shown) on a guide 32. The gap between the guide 32 and the casing of the urinal flush valve is sealed by a water seal ring 33; the gap between the guide 32 and the press rod 31 is sealed by a gasket ring 34. The manual flush control assembly 4 which is locked in place by a locknut 45 and externally sealed by a water seal ring 46 comprises an oscillating rod 41 attached with a water seal cushion 42 and supported on a spring 43. A wire gauze filter 44 is fastened inside the manual flush control assembly 4 to filtrate impurities from water. The water flow rate regulating switch 5 is a rotary type water flow rate controller having a water seal cushion 51 attached to the bottom end thereof. 
     Referring to FIG. 1 again, before the operation of the electromagnetic valve 1, the reciprocating rod 11 is forced by the spring 13 and water pressure to squeeze the water stopper 12 against the diaphragm 2 in sealing the center hole 21, and therefore water is stopped. At the same time, a flow of water flows from a water intake guide hole 25 into the diaphragm chamber 24 through the offset hole 22, permitting the water pressure at the diaphragm chamber 24 to be equilibrated with the water pressure at the water intake guide hole 25, and therefore the diaphragm 2 is stably retained at the valve port 26 to seal the passage way thereof. 
     Referring to FIG. 2, once the electromagnetic valve 1 was triggered by an infrared control switch, the reciprocating rod 11 is attracted upwards to lift the water stopper 12 from the center hole 21 permitting a flow of water to be discharged from the diaphragm chamber 24 through the valve port 26. Because the center hole 21 has a inner diameter much larger than the offset hole 22, the diaphragm 2 is moved from the valve port 26 by the continuous intake flow of water permitting it to directly flow through the valve port 26 in flushing a urinal. The retainer 14 is designed in a curved shape to limit the up stroke of the reciprocating rod 11 within a fixed range. Once the reciprocating rod 11 was attracted by the magnetic force of the electromagnetic valve 1, a noise may be produced. By means of the arrangement of the sound trap groove 16, the noise level is greatly reduced. Once the electromagnetic valve 1 was electrically disconnected, the spring 13 automatically push the reciprocating rod 11 back to its original position in stopping the center hole 21 again. Because the diaphragm chamber 24 is kept in communication with the water intake guide hole 25 through the offset hole 22, the diaphragm 2 is smoothly moved downwards to seal the valve port 26. 
     Referring to FIG. 3, when power supply is disconnected or the infrared control switch fails to work properly, press the manual control knob 3 to move the oscillating rod 41 causing the water seal cushion 42 to open a water passage 47. When the water passage 47 opened, a flow of water is guided to flush the urinal. The wire gauze filter 44 and the internal structure of the manual flush control assembly 4 can be cleaned when the locknut 45 was removed from the casing of the urinal flush valve. 
     The electric control circuit which controls the operation of the electromagnetic valve 1 is of the known techniques and out of the scope of the present invention, and therefore it is not described further. 
     As indicated, the urinal flush valve of the present invention can be operated automatically as well as manually. The manual control mechanism is independently fastened inside the casing of the urinal flush valve without affecting the operation of the automatic control mechanism.