Leak-Preventing Device for a Pump
A pump includes a shell, an air-pumping device, a cover, a valve and a buoyant. The air-pumping device is used for pumping air out of the shell and therefore pumping liquid into the shell. The cover includes an opening and channel defined therein. The cover is attached to the shell and the air-pumping device. The shell is in communication with the exterior thereof via the opening. The shell is in communication with the air-pumping device via the channel. The valve is movable between a first position for releasing the channel and a second position for blocking the channel. The valve is in the second position as the pump is in an inverted position. The buoyant is used for moving the valve to the second position as the pump is almost full of liquid in an upright position.
1. Field of Invention
The present invention relates to a pump and, more particularly, to a leak-preventing device for a pump.
2. Related Prior Art
Referring to
In use, the pump is located in an upright position. A plug (not shown) is fit in the opening 21. A flexible pipe (not shown) is inserted through the plug. An end of the flexible pipe is located in the space defined in the shell 11 while another end of the flexible pipe is located in the used oil 15 contained in the oil pan. The flexible piston is reciprocated in the cylinder 14 to pump air out of the space defined in the cylinder 14 and hence out of the space defined in the shell 11. Some of the used oil 15 is hence pumped from the oil pan into the space defined in the shell 11.
When the space defined in the shell 11 is almost full of the used oil 15, the channel 22 is blocked by the valve 18 lifted by the buoyant 16 and the annular buoyant 13 floating on the used oil 15 contained in the pump 10. Thus, the used oil 15 cannot be pumped into the space defined in the shell 11.
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The present invention is therefore intended to obviate or at least alleviate the problems encountered in prior art.
SUMMARY OF INVENTIONIt is the primary objective of the present invention to provide a pump that can prevent leak.
To achieve the foregoing objective, the pump includes a shell, an air-pumping device, a cover, a valve and a buoyant. The air-pumping device is used for pumping air out of the shell and therefore pumping liquid into the shell. The cover includes an opening and channel defined therein. The cover is attached to the shell and the air-pumping device. The shell is in communication with the exterior thereof via the opening. The shell is in communication with the air-pumping device via the channel. The valve is movable between a first position for releasing the channel and a second position for blocking the channel. The valve is in the second position as the pump is in an inverted position. The buoyant is used for moving the valve to the second position as the pump is almost full of liquid in an upright position.
Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.
The present invention will be described via detailed illustration of seven embodiments versus the prior art referring to the drawings wherein:
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The shell 31 is formed with a lower end 32 and an upper end 35. The shell 31 includes a base 33 formed at the lower end 32. A check valve 34 is located in an opening (not shown) defined in the lower end 32 of the shell 31. The upper end 35 of the shell 31 is an open end.
The air-pumping device includes a cylinder 50, a handle 51, a rod 52 and a flexible piston 53. The cylinder 50 is located in the shell 31. A lower end of the cylinder 50 is attached to the lower end 32 of the shell 31 by welding for example. Thus, the space defined in the cylinder 50 is separated from the space defined in the shell 31. The check valve 34 is located in the cylinder 50. The flexible piston 53 is located in and movable along the cylinder 50. The rod 52 is connected to the flexible piston 53 at an end and connected to the handle 51 at another end.
The cover 40 includes a handle 41 formed thereon, an aperture defined therein axially, an opening 42 defined therein longitudinally, a channel 43 defined therein in a radial direction, an upper port defined therein longitudinally, and a lower port defined therein longitudinally. The channel 43 is in communication with the aperture at an end and in communication with both of the upper and lower ports at an opposite end. The cover 40 is connected to the shell 31 and the cylinder 50 so that the space defined in the shell 31 is in communication with the space defined in the cylinder 50 through the channel 43. The rod 52 is inserted through the aperture. A relief valve 44 is located in the upper port.
The leak-preventing device 60 is used to close the second end of the channel 43. As clearly shown in
The ring 66 includes a cylindrical aperture 67 defined therein and a frusto-conical aperture 68 in communication with the cylindrical aperture 67. The cylindrical aperture 67 is made with a constant diameter throughout its axis. The frusto-conical aperture 68 is made with a diameter that decreases toward the cylindrical aperture 67. Thus, the cylindrical aperture 67 and the frusto-conical aperture 68 together define a tunnel that looks like an inverted funnel when the pump 30 is located in the upright position. The ring 66 is fit in the second section 63 of the tunnel of the short tube 61 and abutted against the annular shoulder. Thus, the liquid is not allowed to go between the ring 66 and the short tube 61. The tunnel defined in the ring 66 is in communication with the tunnel defined in the short tube 61.
The valve 70 is in the form of a ball. The valve 70 is made of a material with a density larger than that of liquid to be pumped into the pump 30. That is, the valve 70 along does not float on the liquid. Preferably, the valve 70 is made of metal. The valve 70 is movably located in the second section 63 of the tunnel defined in the short tube 61.
The buoyant 71 includes an upper section 72 and a lower section 73. The diameter of upper section 72 is smaller than that of the lower section 73. The upper section 72 of the buoyant 71 is movably inserted in the second section 63 of the tunnel defined in the short tube 61.
The long tube 80 includes a thread 81 extending on an internal side near an open upper end thereof, an aperture 82 defined in a lower end, and slots 83 defined therein. The thread 81 is engaged with the thread 65, thus connecting the long tube 80 to the short tube 61. The buoyant 71 is movably located in the long tube 80.
The pump 30 is useful in pumping liquid such as used oil out of an oil pan of an engine of for example. Referring to
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The present invention has been described via the detailed illustration of the embodiments. Those skilled in the art can derive variations from the embodiments without departing from the scope of the present invention. Therefore, the embodiments shall not limit the scope of the present invention defined in the claims.
Claims
1. A pump including:
- a shell;
- an air-pumping device for pumping air out of the shell, thus pumping liquid into the shell;
- a cover including an opening and channel defined therein, wherein the shell is in communication with the exterior thereof via the opening and in communication with the air-pumping device via the channel as the cover is attached to the shell and the air-pumping device;
- a valve movable in the shell between a first position for releasing the channel and a second position for blocking the channel, wherein the valve is in the second position as the pump is in an inverted position; and
- a buoyant for moving the valve to the second position as the pump is almost full of liquid in an upright position.
2. The pump in accordance with claim 1, further including a long tube connected to the cover and formed with a tunnel in communication with the tunnel defined in the cover, wherein the valve is movably located in the long tube.
3. The pump in accordance with claim 2, wherein the buoyant is movably located in the long tube.
4. The pump in accordance with claim 2, wherein the buoyant is movably located outside the long tube.
5. The pump in accordance with claim 4, wherein the valve includes a first end movably located in the long tube and a second end movably located outside the long tube.
6. The pump in accordance with claim 2, further including a short tube extending from the cover and including a tunnel in communication with the channel defined in the cover, wherein the long tube is connected to the short tube.
7. The pump in accordance with claim 6, wherein the short tube includes a thread extending on an external side thereof, wherein the long tube includes a thread extending on an internal side thereof for engagement with the thread of the short tube.
8. The pump in accordance with claim 1, furthering including a ring fit in the long tube and used for contact with the valve.
9. The pump in accordance with claim 6, wherein the ring includes a frusto-conical aperture defined therein, wherein the valve is a ball for firm contact with an internal side of the ring.
10. The pump in accordance with claim 1, wherein the valve is a ball.
11. The pump in accordance with claim 1, wherein the valve is formed with a boss for blocking the tunnel defined in the cover.
12. The pump in accordance with claim 1, further including a ball in contact with the valve.
13. The pump in accordance with claim 12, wherein the ball is solid.
14. The pump in accordance with claim 12, wherein the ball is hollow.
15. The pump in accordance with claim 12, wherein the valve includes a recess defined therein for receiving the ball.
16. The pump in accordance with claim 1, wherein the air-pumping device includes a cylinder located in and connected to the shell, a flexible piston movable in the cylinder, a rod connected to the flexible piston, a handle connected to the rod, and a check valve attached to an end of the cylinder.
17. A pump including:
- a shell;
- an air-pumping device for pumping air out of the shell and therefore pumping liquid into the shell;
- a cover including an opening and a channel defined therein, wherein the shell is in communication with the exterior thereof via the opening and in communication with the air-pumping device via the channel as the cover is attached to the shell and the air-pumping device;
- a first valve movable in the shell between a first position for releasing the channel and a second position for blocking the channel;
- a buoyant for floating on liquid pumped into the pump and moving the first valve to the second position as the pump is almost full of the liquid in an upright position; and
- a second valve A movable in the shell between a first position for releasing the channel as the pump is in the upright position and a second position for blocking the channel as the pump is in an inverted position.
18. The pump in accordance with claim 17, wherein the cover includes a pocket B that intersects the channel, wherein the second valve A is movably located in the pocket B.
Type: Application
Filed: Jun 5, 2011
Publication Date: Dec 6, 2012
Inventor: Tien-Tsai Tseng
Application Number: 13/153,457
International Classification: F04B 23/00 (20060101);