Method and structure of preventing water from leakage for the pressurized pump of diaphragm type

A diaphragm type pressurized pump comprises a hollow cylinder formed on the top surface of each piston acting region of the diaphragm sheet. A piston head pushing chunk is disposed on the diaphragm sheet such that a ladder hole in the piston head pushing chunk receives the hollow cylinder. A fixing screw is driven via the center of the hollow cylinder into the threaded hole on each wobble plate. As a result of driving the fixing screw, the upper portion of the hollow cylinder expands thereby deforming and filling up the space between the bottom surface of the head of the fixing screw and the top surface of the ladder hole of the piston head pushing chunk, and thus preventing water from leaking and seeping into the motor of the pump.

FIELD OF THE PRESENT INVENTION

The present invention relates to the pressurized pump of diaphragm type exclusively used in the reverse osmosis purification, particularly for the pressurized pump with diaphragm function to prevent water from leaking into the motor to thoroughly overcome the drawback of shortening the service life in premature defectively damage by electric short circuit due to water leakage seeping into motor, which always happens in the conventional pressurized pump currently.

BACKGROUND OF THE INVENTION

Currently, there are many pressurized pumps of diaphragm type exclusively used in the reverse osmosis purification as disclosed in the U.S. Pat. Nos. 4,396,357, 4,610,605, 5,476,367, 5,571,000, 5,615,597, 5,626,464, 5,649,812, 5,706,715, 5,791,882, 5,816,133, 6,048,183, 6,089,838, 6,299,414, 6,604,909, 6,840,745 and 6,892,624; Their structure is as shown in theFIG. 1throughFIG. 3, which comprising: a motor10; an upper hood chassis11at the end of the output shaft (not shown in the figure) of said motor10, and having some screw bores12on the circumference of said upper hood chassis11; some wobble plates13driven by the output shaft of said motor10to converted into axial reciprocating motion in said upper hood chassis11; a diaphragm sheet20covering on said upper hood chassis11; some piston head pushing chunks30disposed on said diaphragm sheet20; a piston valve body40inset in said diaphragm sheet20and a pump cover body50; By means of bolts2running through those said screw bores12on said upper hood chassis11and corresponding perforated holes51on said pump cover body50, all components said above are assembled into a integral whole body (as shown in theFIG. 2).

Wherein, a ring of seal groove raised bar21is built on the top of the circumference at said diaphragm sheet20, and some raised ribs22are radial built from its top center to joint with said seal groove raised bar21, so that some piston acting regions23are partitioned by said raised ribs22and seal groove raised bar21; And, a central perforated hole24is punched on each said piston acting regions23in alignment with the threaded hole14of each said wobble plate13; By mean of each fixing screw3running through the internal ladder hole31on each said piston head pushing chunk30and each said corresponding central perforated hole24on each said piston acting region23, said diaphragm sheet20and those said piston head pushing chunks30can be screwed on those said threaded holes14on said wobble plates13(as shown in theFIG. 2);

Moreover, a hemispherical concaved water drain base41facing said pump cover body50is built in the center of said piston valve body40with a positioning hole42in its center; a partition indented groove43is formed on each 120° included angle along the radial line from its center so that three isolated sectors are separated by these said indented grooves43; some water drain ports44are created on each said isolated sectors, and some water inlet ports45are created on the circumference in correspondence with each said water drain port44; an upside down flare piston sheet46is punched in the center of each said water inlet ports45so that enable each said flare piston sheet46to block each said water inlet ports45; Said anti-reverse baffle plastics pad47which being a soft elastic hollow hemisphere of unitary body with a positioning pole48protruding in the bottom center, stays closely against the top surface tightly of said water drain base41on said piston valve body40; a partition rib plate49is formed on each 120° included angle along the radial line from its center so that three isolated sectors are separated by these said rib plates49; a protruding peg481is also formed on the outer peripheral surface in correspondence with each said rib plate49; By means of plugging said positioning pole48into said positioning hole42on said water drain base41together with insetting each said protruding peg481into each corresponding said indented groove43, the outer hemisphere surface of said anti-reverse baffle plastics pad47will tightly contact against closely all said water drain ports44on each sector of said water drain base41(as shown in theFIG. 2); Wherein, a water inlet chamber100is formed among said anti-reverse baffle plastics pad47, all said water drain ports44on each sector of said water drain base41and said piston head pushing chunk30on said diaphragm sheet20(as shown in theFIG. 3); besides, one end of each said water inlet chamber100is connected with each said water inlet port45.

Furthermore, some perforated holes51and a water inlet orifice52as well as a water outlet orifice53are created on the outer surface of said pump cover body50(as shown in theFIG. 1andFIG. 3), which also having a ladder groove54and an annular groove55built inside; said ladder groove54is created at the bottom peripheral of said pump cover body50so that to closely contact with the outer peripheral of the assembly of said diaphragm sheet20and said piston valve body40; said annular groove55is created in the internal center with bottom tightly press on the outer peripheral surface of said water drain base41on said piston valve body40so that a high pressure water chamber200is surrounded by space between the internal wall of said annular groove55and said water drain base41of said piston valve body40(as shown in theFIG. 3).

Please refer toFIG. 4andFIG. 5, the illustration shown is the operation way of conventional pressurized pumps of diaphragm type mentioned above. When tap-water flows into the water inlet orifice52on the pump cover body50, the tap-water will push the flare piston sheet46on the piston valve body40open and flows into the water inlet chamber100via the water inlet port45on the piston valve body40(as shown by the arrow head in theFIG. 4); Upon all the wobble plates13being orderly driven by the output shaft of the motor10, the piston head pushing chunk30on each said wobble plates13will be meanwhile brought to axial reciprocating motion, so that each piston acting region23on the diaphragm sheet20will simultaneously vibrate in displacement to squeeze the water in the water inlet chamber100to let water pressure increase up to 80 psi˜100 psi; The high pressure water Wp will push the anti-reverse baffle plastics pad47on the water drain base41open and constantly flow into the high pressure water chamber200via each said water drain port44on said water drain base41, then drain out of the pressurized pump via each water outlet orifice53on the pump cover body50(as shown by the arrow head of theFIG. 5) in order to provide the water pressure necessary for reverse osmosis by the RO membrane cartridge RO in the RO filter apparatus.

However, there is a common serious drawback in all the disclosed conventional pressurized pump of diaphragm type aforesaid as shown in the figures of6through9. During the process of increasing water pressure after the start of the motor10, each wobble plate13is tightly contacting with the diaphragm sheet20closely; hence, said diaphragm sheet20between said piston acting region23and wobble plate13will be pulled to stretch once when each time said wobble plate13moves in reciprocating motion to drive said piston acting region23on said diaphragm sheet20(as shown by the hypothetical line in theFIG. 8); thereby, said diaphragm sheet20will be pulled to stretch for 700 times in one minute if rotational speed is 700 rpm; thus, said diaphragm sheet20will loosely contact with said piston head pushing chunk30without hermetical seal due to long time and high frequent stretch (as shown in theFIG. 9); Consequently, the high pressure water Wp will leak and seep along the gap between the fixing screw3and the threaded hole14on each said wobble plate13and result in total disable and damage of the whole pressurized pump of diaphragm type in consequence of electric short circuit of said motor10; Under the circumstance of such drawback having no effective solution so far in the manufacturing industry, the consumer has no choice in betting his own luck to buy a target pressurized pump with uncertain service lifetime; If he is unlucky to have motor10burnt out due to leakage, the result on fire is un-neglectful.

Moreover, except the aforesaid vital drawback, the other problematical position often leaking is between the piston valve body40and the pump cover body50as shown in theFIG. 10. When the piston acting region23on the diaphragm sheet20is constantly pushed and squeezed by the wobble plate13, the top outer peripheral surface of the piston valve body40will constantly strike against and pull off the wall of the ladder groove54on the pump cover body50(as shown by the black arrow head in theFIG. 10); owing to both of said piston valve body40and pump cover body50being rigid body without any buffer structure contrivance, the gap will be easily created in between of which after long time of repeatedly strike against and pull off each other; Under high pressure action of water, the water will leak and seep out of the pressurized pump of diaphragm type via the gap between the wall of said ladder groove54on said pump cover body50and the top outer peripheral surface of said piston valve body40; Thus, the total effect of increasing water pressure is reduced due to loss in this partial pressure.

SUMMARY OF THE INVENTION

The main object of the present invention is to provide a method and structure of preventing water from leakage for the pressurized pump of diaphragm type with steps orderly comprises: corresponding to the threaded hole on each wobble plate, a hollow cylinder is first contrived on the top surface of each piston acting region of the diaphragm sheet; after sleeving the ladder hole of the piston head pushing chunk on the diaphragm sheet onto the peripheral of said hollow cylinder; drive the fixing screw via the center hole of said hollow cylinder into the threaded hole on each wobble plate of the pressurized pump of diaphragm type; and in the beginning of driving said fixing screw, the upper portion of said hollow cylinder will expand first; after thoroughly and tightly driving said fixing screw into the threaded hole on each wobble plate, the upper portion of said hollow cylinder will expanding deform and fill up the space between the bottom surface of the head of said fixing screw and the top surface of said ladder hole of said piston head pushing chunk; Thus, the function of said hollow cylinder becomes a blocking contrivance in preventing the water from leaking and seeping into the motor and avoiding the damage of pressurized pump of diaphragm type due to electric short circuit of the motor.

The other object of the present invention for providing a method and structure of preventing water from leakage for the pressurized pump of diaphragm type even more contrives an elastic soft washer between the outer peripheral of said piston valve body and the wall of said ladder groove on said pump cover body such that becoming a buffer region so as not only to reduce the rigid striking force and noise by said pump cover body and piston valve body, but also to achieve the effect in hermetical seal in preventing pressure loss and water leakage out of the pressurized pump.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to the figures of11through13shown as the present invention of The method and structure of preventing water from leakage for the pressurized pump of diaphragm type. Corresponding to the threaded hole14on each wobble plate13, a hollow cylinder64is first contrived on the top surface of each piston acting region63of the diaphragm sheet60such that its outer diameter is equivalent to or slightly smaller than the internal diameter of the ladder hole31on the piston head pushing chunk30; and both of said hollow cylinder64and diaphragm sheet60are made of same elastic plastics material in extruded unitary molded body (as shown in theFIG. 11and A view of theFIG. 12); after sleeving said ladder hole31of said piston head pushing chunk30onto the peripheral of said hollow cylinder64(as shown in B view of theFIG. 12), drive the fixing screw3via the center hole of said hollow cylinder64(as shown in C view of theFIG. 12) into the threaded hole14on each wobble plate13; In the beginning of driving said fixing screw3, the upper portion of said hollow cylinder64will expand first; after thoroughly and tightly driving said fixing screw3into the threaded hole14on each wobble plate13, the upper portion of said hollow cylinder64will expanding deform and fill up the space between the bottom surface of the head of said fixing screw3and the top surface of said ladder hole31of said piston head pushing chunk30(as shown in D view of theFIG. 12and in theFIG. 13); Thus, the function of said hollow cylinder64becomes a blocking contrivance in preventing the water from leakage.

Please further refer to the figures of14through16, when said wobble plate13acting in push and squeeze the feed water W (as shown in theFIG. 16), the diaphragm sheet20of the piston acting region23will be pushed to displacement simultaneously so that a gap δ is created between the bottom surface of said piston head pushing chunk30and the top surface of said diaphragm sheet20(as shown in theFIG. 14); By means of surrounding block function of expansion deformation on the upper portion of said hollow cylinder64, the leakage and seeping of water along the gap between said fixing screw3and said threaded hole14on each said wobble plate13can be avoided; thus, it achieves the effect in preventing the damage of the pressurized pump from electric short circuit in the motor10due to the high pressure water Wp leaking and seeping into the motor10.

Please also further refer to the figures of17through19, the present invention even more contrives an elastic soft washer70between the outer peripheral of said piston valve body40and the wall of said ladder groove54on said pump cover body50such that becoming a buffer region so as not only to reduce the rigid striking force and noise by said pump cover body50and piston valve body40, but also to achieve the effect in hermetical seal in preventing pressure loss and water leakage out of the pressurized pump.

In conclusion, the present invention contrives the hollow cylinder64to replace the central perforated hole24of the piston acting region23/63on the diaphragm sheet20/60, and employs the same original assemble steps to form the leakage-resistant structure; Therefore, it is really an innovative invention with industrial application value owing to not only eliminating any extra expense in manufacturing cost, but also achieving the effect in leakage-resistance.