Pump

Abstract

A pump for boosting and transporting a liquid, includes a housing, a gear rotor device, at least one cover and a motor. A transportation chamber is defined in the housing. An inlet and an outlet are defined in the housing and respectively in communication with the transportation chamber. The gear rotor device is received in the transportation chamber. The gear rotor device includes first and second gears meshing with each other. The at least one cover covers and seals at least one side of the housing. The motor is mounted on one cover with a shaft thereof rotatably connecting with one of the first and second gears. Through a full compression by the gear rotor device, the liquid transportation is in a positive displacement and the liquid is pressurized by the gear rotor device whereby the pump has high head and therefore efficiently transports the liquid.

Description

BACKGROUND OF THE INVENTION

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.

SUMMARY OF THE INVENTION

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.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a pump of the present invention;

FIG. 2 is a crosssectional view of a transportation chamber of the present invention;

FIG. 3 is a crosssectional view along line 3-3 in FIG. 1;

FIG. 4 is a perspective view showing the pump being applied to a window type air-cooler;

FIGS. 5 and 6 are schematic views showing the pump being applied to a separation type air-cooler;

FIG. 7 is a schematic view showing a pump in accordance with the second embodiment of the present invention;

FIG. 8 is a schematic view showing a pump in accordance with the third embodiment of the present invention; and

FIGS. 9A-9D are schematic views showing different arrangements of an inlet and an outlet.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1-3, a pump 1 of the present invention includes a housing 2, a gear rotor device 3, first and second covers 40, 41 and a motor 5. A transportation chamber 20 is defined through the housing 2 for receiving the gear rotor device 3. In this embodiment, the transportation chamber 20 has two cavities with different diameters and in communication with each other. That's, diameters of pitch circles of meshing gears of the gear rotor device 3 are different. Therefore, a transportation rate of liquid is increased and a rotate speed of the gear rotor device 3 is increased too. Referring to FIG. 3, the gear rotor device 3 includes a first gear 30 and a second gear 31. The meshing first and second gears 30, 31 are spur gears or heelical gears. The first gear 30 rotatably connects with the motor 5 and has a relatively large diameter and a relatively great amount of gear teeth 301. The first gear 30 drives the second gear 31 as a gearwheel drives a pinion. So the rotate speed of the gear rotor device 3 in the transportation chamber 20 is increased and the transportation rate of liquid is increased too. An inlet 201 and an outlet 202 are defined in the housing 2 and respectively in communication with the transportation chamber 20. In this embodiment, the inlet 201 and the outlet 202 are configured in a line and at opposite sides of the transportation chamber 20.

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 FIG. 4, the pump 1 of the present invention is applied to a window type air-cooler 7. The pump 1 (as shown in broken line) is mounted between an evaporator 70 and a condensator 71 of the window type air-cooler 7. When the motor 5 of the pump 1 is actuated, a condensed liquid of the evaporator 70 is drawn from the inlet 201 to the transportation chamber 20 through a tube 23 connected between the inlet 201 and the transportation chamber 20. Another tube 23 is connected with the outlet 202 with a nozzle 24 connected with the other end thereof for spraying the condensator 71, thereby increasing efficiency of heat dissipation of the window type air-cooler 7.

Referring to FIGS. 5 and 6, the pump 1 is applied to a separation type air-cooler 6. The pump 1 is mounted at a side of the air-cooler 6 away from a control PCB assembly 60 (see FIG. 5), or is mounted at a side of the air-cooler 6 close the control PCB assembly 60 (see FIG. 6). Therefore, when the motor 5 of the pump 1 is actuated, a condensed liquid of an evaporator (not shown) of the air-cooler 6 is drawn from the inlet 201 to the transportation chamber 20 and then expelled from the outlet 202 to a predetermined place through a tube 23 connected with the outlet 202. Thus, since the pump 1 has high head, the pump 1 is capable to be directly installed in the interior of the separation type air-cooler 6. So, it is convenient to install the pump 1 and the separation type air-cooler 6.

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.

FIGS. 7 and 8 show pumps 1′ in accordance with the second and third embodiments of the present invention. A transportation chamber 20′ is defined in each pump 1′ and has two cavities with same diameters, which is different from the first embodiment. So, diameters of pitch circles of meshing first and second gears 30′, 31′ are the same. As shown in FIG. 7, an inlet 201′ is connected with a side wall of the transportation chamber 20′ which is formed along a beeline between two points P, Q of tangencies of the largest meshing rotor circles of the first and second gears 30′, 31′. Thus, the liquid is drawn smoothly during the meshing rotation of the first and second gears 30′, 31′. The rotation path to draw liquid is increased for preventing from incompletely drawing the liquid thereby preventing the cavitation. Furthermore, it is prevented from incompletely suction during the high-speed transportation, thereby preventing the cavitation.

Referring to FIGS. 9A-9D, the pump 1″ has an inlet 201″ and an outlet 202″ which are formed with different arrangements by axis and longitude on the transportation chamber. The pump 1″ can also achieve the objects of the present invention since it has the above-mentioned advantages of the present invention.

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.

Claims

1. A pump for boosting and transporting a liquid, comprising:

a housing, transportation chamber being defined in the housing, an inlet and an outlet being defined in the housing and respectively in communication with the transportation chamber;

a gear rotor device received in the transportation chamber, the gear rotor device comprising first and second gears meshing with each other;

at least one cover covering and sealing at least one side of the housing; and

a motor mounted on one cover with a shaft thereof rotatably connecting with one of the first and second gears;

Wherein 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.

2. The pump as claimed in claim 1, wherein the meshing first and second gears are spur gears or helical gears.

3. The pump as claimed in claim 1, wherein the transportation chamber has two cavities with same diameters.

4. The pump as claimed in claim 3, wherein the 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.

5. The pump as claimed in claim 1, wherein the transportation chamber has two cavities with different diameters and in communication with each other, that's, diameters of pitch circles of the meshing gears are different, the gear rotatably connecting with the motor has a relatively large diameter and a relatively great amount of gear teeth and drives the other gear as a gearwheel drives a pinion thereby increasing a transportation rate of the liquid and a rotation speed of the other gear.

6. The pump as claimed in claim 5, wherein the inlet and the outlet are mounted with different arrangements by axis and longitude on the transportation chamber.

7. The pump as claimed in claim 6, wherein a nozzle is further connected with the outlet for providing a spraying function.

8. The pump as claimed in claim 7, wherein the transportation chamber is defined through the housing, first and second covers respectively cover upper and lower sides of the housing thereby sealing the transportation chamber and positioning the first and second gears within the transportation chamber.