Pumps – With condition responsive pumped fluid control
Reexamination Certificate
1999-08-16
2001-01-09
Thorpe, Timothy S. (Department: 3746)
Pumps
With condition responsive pumped fluid control
C417S299000, C417S307000, C417S311000, C417S440000
Reexamination Certificate
active
06171071
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a water pump, and more particularly to a water pump having a water cooling device.
2. Description of the Prior Art
Typical water pumps are provided for pumping water to a reservoir or the like. However, the typical water pumps have no water cooling device for cooling the water pumps. In addition, when the valve in the reservoir is switched off, the water pump some times may still be energized and actuated such that the water pressure in the water pump or in the coupling pipes may be greatly increased and such that the coupling pipes and the other elements may be damaged.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional water pumps.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a water pump including a pressure relieving device for relieving the pressure in the water passages when the water outlet is switched off and when the water pump is still actuated, and including a cooling device for cooling the water pump.
In accordance with one aspect of the invention, there is provided a water pump comprising a housing having a water inlet and a water outlet and having an exit and a mouth, a circulating water passage coupled between the exit and the mouth of the housing, means for pumping water from the exit to the mouth of the housing via the circulating water passage, and means for switching water to flow out of the water outlet when the water outlet is opened and to circulate through the exit and the circulating water passage when the water outlet is closed.
The circulating water passage includes a first coupler coupled to the exit of the housing, a first receptacle coupled between the first coupler and the mouth, a second coupler and a second receptacle secured together, a tube secured between the first and the second couplers, and a conduit coupled between the first and the second receptacles. A rod is slidably received between the first and the second couplers, and means for moving the rod in a reciprocating action to pump the water in the first and the second couplers to the first and the second receptacles respectively.
The moving means includes a casing, a shaft rotatably secured in the casing and having an eccentric pawl for engaging with and moving the rod, and a rotating means includes a gear provided on the shaft, and a motor having a pinion engaged with the gear to drive the shaft. The conduit extends through the casing for cooling a lubricating oil received in the casing.
The switching means includes a first duct and a second duct and a partition provided between the first duct and the second duct, the first duct includes a first portion communicating with the mouth and includes a second portion, the second duct includes a first interior portion communicating with the water inlet and includes a second interior portion communicating with the water outlet, the partition includes a first passage communicating the first portion of the first duct with the first interior portion of the second duct and includes a second passage communicating the second portion of the first duct with the second interior portion of the second duct, and means for blocking the first interior portion of the second duct when the water outlet is opened.
The switching means includes a separator gasket secured between the second and the first interior portions, a first valve seat provided between the water inlet and the first interior portion of the second duct, a first plug for engaging with the first valve seat, and means for biasing the first plug to engage with the first valve seat when the water outlet is closed. The switching means includes a second valve seat provided between the first and the second portions of the first duct, a second plug for engaging with the second valve seat, and means for biasing the second plug to engage with the second valve seat when the water outlet is closed.
Further objectives and advantages of the present invention will become apparent from a careful reading of a detailed description provided hereinbelow, with appropriate reference to accompanying drawings.
REFERENCES:
patent: 1070733 (1913-08-01), Reavell
patent: 2342001 (1944-02-01), Magnuson
patent: 2665552 (1954-01-01), Deardorff
patent: 2700339 (1955-01-01), Schmitt
patent: 4008012 (1977-02-01), Page
patent: 4445818 (1984-05-01), Ohsaki et al.
Tzeng Sheng Jong
Tzeng Tsann Ruey
Baxley Charles E.
Solak Timothy P.
Thorpe Timothy S.
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