1. Field of the Invention
The present invention relates to a pump, particularly to a pump which has high head, is not limited to be mounted beneath a liquid surface for starting, is applied for drain of condensed water of an air-cooler, spray for heat dissipation of a condenser, spouting of a windshield wiper of a car, headlight cleanout, spray of gardening watering and so on, and achieves a positive transportation result.
2. Prior Art
In general, many implements are equipped with pumps for aiding to transport a liquid to a predetermined place. For example, when condensed water of an air-cooler cannot be drained due to the mounted position limitation of the outlet for the condensed water, a pump is installed additionally as a relay station to draw the condensed water to a predetermined place. As another example, a liquid for a windshield wiper of a car is drawn to a windshield of the car by a pump too. As another example, a pump is used in spray and irrigation for gardening flowers and grass. As described above, pumps are widely applied.
However, the conventional pump is centrifugal type with low head. Furthermore, a net positive suction head (NPSH) problem has to be considered when the pump is installed. That's, the inlet of the conventional centrifugal pump must locate below a liquid surface in a proper depth. Otherwise, cavitation will occur, which results that the function of transporting is adversely affected or even lapsed. Thus, it is inconvenient to install the conventional pump.
Accordingly, an object of the present invention is to provide a pump, which has high head and is convenient to be installed with an inlet thereof being above or beneath a liquid surface.
Further object of the present invention is to provide a pump preventing cavitation from a high-speed rotation.
Further object of the present invention is to provide a pump, which is applied to an air-cooler with a nozzle for spraying the condenser of the air-cooler thereby, increasing heat transfer efficiency.
To achieve the above-mentioned objects, a pump of the present invention characterizes in that a gear rotor device received in a transportation chamber. The gear rotor device includes first and second gears meshing with each other. Through a full compression by the gear rotor device, the liquid transportation is in positive displacement and the liquid is pressurized by the gear rotor device whereby the pump has high head and therefore efficiently transports the liquid.
Wherein the meshing first and second gears are spur gears or helical gears.
According to one aspect of the present invention, the transportation chamber has two cavities with different diameters and in communication with each other, that's, diameters of pitch circles of the meshing first and second gears are different, thereby increasing a transportation rate of the liquid and a rotation speed of the other gear.
According to another aspect of the present invention, the transportation chamber has two cavities with same diameters.
Wherein an inlet is connected with a side wall of the transportation chamber which is formed along a beeline between two points of tangencies of the largest meshing rotor circles of the first and second gears, whereby the liquid is drawn smoothly during the meshing rotation of the first and second gears for preventing from incompletely suction thereby preventing cavitation.
According to another aspect of the present invention, the inlet and the outlet are mounted with different arrangements by axis and longitude on the transportation chamber.
Referring to
The first and second covers 40, 41 respectively cover upper and lower sides of the housing 2 thereby sealing the transportation chamber 20 and positioning the first and second gears 30, 31 within the transportation chamber 20. The motor 5 is mounted on the first cover 40 with a shaft (not shown) thereof rotatably connecting with the first gear 30. When the motor 5 is actuated, the motor 5 drives the first gear 30 to rotate and then drives the second gear 31 to rotate. Therefore, when the first and second gears 30, 31 mesh with each other to rotate in reverse directions, the liquid will be drawn from the inlet 201 to the transportation chamber 20 through the suction zone 21 defined between the first and second gears 30, 31, and then compressed by the meshing first and second gears 30, 31, and then expelled from the outlet 202 along the rotation directions of the first and second gears 30, 31. Since the first gear 30 meshes with the second gear 31 and drives the second gear 31 to rotate, the rotation is smooth and so the transportation is in a positive volume manner. Thus, a full compression is achieved in the pump 1 and so the pump 1 has high head and cavitation does not occur. Therefore, it is unnecessary to consider the NPSH problem and so it is easy to install the pump 1.
Referring to
Referring to
The pump 1 of the present invention is capable to smoothly transport the liquid under a high rotation speed, since the transportation is positive displacement. Furthermore, the pump 1 has high head and cavitation does not occur under the high rotation speed. Therefore, besides the air-cooler, the pump 1 may be applied to other implements needing to pressurizingly transport the liquid, such as spouting of a rain brush of a car, headlight cleanout, spray of gardening watering and so on.
Referring to
It is understood that the invention may be embodied in other forms without departing from the spirit thereof. Thus, the present examples and embodiments are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein.