Air pump including storage tank including outlet port adapted to be opened/closed automatically

Abstract

An air pump includes a pumping system, a storage tank, a discharge passage, and a valve. The discharge passage includes a first section and a second section wider than the first section. The valve is movable in the discharge passage. The valve, disposed in a first position, includes a first seal end disposed in the first section and abutting a periphery thereof and includes a second seal end disposed in the second section and abutting a periphery thereof. The valve, disposed in a second position, includes the first seal end disengaging from the first section and not abutting the periphery thereof and includes the second seal end disposed in the second section and abutting the periphery thereof. The first and second seal ends respectively have first and second cross-sectional areas. The ratio of the second cross-sectional area to the first cross-sectional area is at least 2 to 1.

Claims

1. A air pump comprising: a pumping system including a cylinder; a storage tank connected to the cylinder and including an inlet port for receiving air generated by the pumping system and an outlet port; a discharge passage connected to the outlet port and extending axially, wherein the discharge passage includes a first section and a second section wider than the first section; and a valve being movable in the discharge passage between a first position and a second position, wherein the valve, disposed in the first position, includes a first seal end disposed in the first section and abutting a periphery thereof and includes a second seal end disposed in the second section and abutting a periphery thereof, wherein the valve, disposed in the second position, includes the first seal end disengaging from the first section and not abutting the periphery thereof and includes the second seal end disposed in the second section and abutting the periphery thereof, wherein the first and second seal ends respectively have first and second cross-sectional areas, and wherein the ratio of the second cross-sectional area to the first cross-sectional area is at least 2 to 1, wherein the valve has a middle portion extending between the first seal end and the second seal end, and wherein the valve includes a hole extending through the middle portion and defining two open ends.

2. The air pump as claimed in claim 1, wherein the ratio of the second cross-sectional area to the first cross-sectional area is at least 10 to 1.

3. The air pump as claimed in claim 2, wherein the valve has a middle portion extending between the first seal end and the second seal end, and wherein the valve includes a hole extending through the middle portion and defining two open ends.

4. The air pump as claimed in claim 1 further comprising a biasing member acting on the valve in a direction towards the outlet port, wherein the discharge passage has an outlet end defining an opening on a wall of the second section, wherein the second section is wider than the opening, and wherein the biasing member includes an end abutting the valve and another end abutting the wall.

5. The air pump as claimed in claim 4 further comprising a passage allowing air to flow thereout, wherein the passage has a first end connected to the cylinder, a second end connected to the inlet port of the storage tank, and a third end connected to the outlet end, and wherein the passage includes a control disposed therein and being operable for selectively stopping air flowing into the storage tank through the inlet port.

6. The air pump as claimed in claim 5, wherein the passage includes a first passage having one distal end connected to the cylinder and another distal end bifurcating into a second passage and a third passage, with the second passage having one distal end connected to the first passage and another distal end connected to the inlet port, with the third passage having one distal end connected to the first passage, a middle end connected to the outlet end, and another distal end that allows air to flow out of the air pump.

7. The air pump as claimed in claim 5, wherein the control includes a plug, a second biasing member acting on the plug in a first direction, and a cam acting on the plug in a second direction opposing the first direction.

8. The air pump as claimed in claim 6, wherein the control is disposed in the second passage, wherein the second passage includes a narrower section and a wider section and defines an orifice between the narrower and wider sections, wherein the control includes a plug engaging in the orifice, a second biasing member including one end abutting the plug and another end abutting a wall of the wider section, and a cam acting on the plug and counteracting the second biasing member.

9. The air pump as claimed in claim 7, wherein the pumping system includes a plunger and a piston coupled to an end of the plunger, wherein the piston is disposed in the cylinder, and wherein the piston is reciprocally movable in the cylinder and is operated by the plunger.

10. The air pump as claimed in claim 9 further comprising a one-way seal device disposed in the passage, wherein the one-way seal device is located between the pumping system and the control.

11. The air pump as claimed in claim 3 further comprising a biasing member acting on the valve in a direction towards the outlet port, wherein the discharge passage has an outlet end defining an opening on a wall of the second section, wherein the second section is wider than the opening, and wherein the biasing member includes an end abutting the valve and another end abutting the wall.

12. The air pump as claimed in claim 11 further comprising a passage allowing air to flow thereout, wherein the passage has a first end connected to the cylinder, a second end connected to the inlet port of the storage tank, and a third end connected to the outlet end, and wherein the passage includes a control disposed therein and being operable for selectively stopping air flowing into the storage tank through the inlet port.

13. The air pump as claimed in claim 12, wherein the passage includes a first passage having one distal end connected to the cylinder and another distal end bifurcating into a second passage and a third passage, with the second passage having one distal end connected to the first passage and another distal end connected to the inlet port, with the third passage having one distal end connected to the first passage, a middle end connected to the outlet end, and another distal end that allows air to flow out of the air pump.

14. The air pump as claimed in claim 12, wherein the control includes a plug, a second biasing member acting on the plug in a first direction, and a cam acting on the plug in a second direction opposing the first direction.

15. The air pump as claimed in claim 13, wherein the control is disposed in the second passage, wherein the second passage includes a narrower section and a wider section and defines an orifice between the narrower and wider sections, wherein the control includes a plug engaging in the orifice, a second biasing member including one end abutting the plug and another end abutting a wall of the wider section, and a cam acting on the plug and counteracting the second biasing member.

16. The air pump as claimed in claim 14, wherein the pumping system includes a plunger and a piston coupled to an end of the plunger, wherein the piston is disposed in the cylinder, and wherein the piston is reciprocally movable in the cylinder and is operated by the plunger.

17. The air pump as claimed in claim 16 further comprising a one-way seal device disposed in the passage, wherein the one-way seal device is located between the pumping system and the control.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a partial, cross-sectional view of an air pump in accordance with the present invention.

(2) FIG. 2 is a partial, cross-sectional view showing the air pump including a pumping system generating air and which is delivered to and is stored within a storage tank, with a control in a first position.

(3) FIG. 3 is a partial, cross-sectional view showing the pusher disposed in the first position as well as air discharging out of the storage tank and the outlet port of the storage tank in an open position.

(4) FIG. 4 is a partial, cross-sectional view showing the pumping system generating air and which flows bypass the storage tank, with the control in a second position.

DETAILED DESCRIPTION OF THE INVENTION

(5) An air pump 10 includes a pumping system 2, a storage tank 30, a discharge passage 31, and a valve 32.

(6) The pumping system 2 includes a cylinder 20, a plunger 22, and a piston 24 coupled to an end of the plunger 22. The piston 24 is disposed in the cylinder 20. The piston 24 is reciprocally movable in the cylinder 20 and is operated by the plunger 22.

(7) The storage tank 30 is connected to the cylinder 20 and includes an inlet port 301 for receiving air generated by the pumping system 2 and an outlet port 302.

(8) The discharge passage 31 is connected to the outlet port 302 and extends axially. The discharge passage 31 extends axially and longitudinally along an axis L. The discharge passage 31 includes a first section 311 and a second section 312 and extends from the first section 311 to the second section 312 along the axis L. The second section 312 is wider than the first section 311 in a width direction of the discharge passage 31, which is perpendicular to the axis L.

(9) The valve 32 is movable in the discharge passage 31 between a first position and a second position. The valve 32, disposed in the first position, includes a first seal end 321 disposed in the first section 311 and abutting a periphery thereof and includes a second seal end 322 disposed in the second section 312 and abutting a periphery thereof. The valve 32, disposed in the second position, includes the first seal end 321 disengaging from the first section 311 and not abutting the periphery thereof and includes the second seal end 322 disposed in the second section 312 and abutting the periphery thereof.

(10) The first and second seal ends 321 and 322 respectively have first and second cross-sectional areas A1 and A2. The ratio of the second cross-sectional area A2 to the first cross-sectional area A1 is at least 2 to 1. It is also contemplated that the ratio of second cross-sectional area A2 to the first cross-sectional area A1 is at least 10 to 1.

(11) The valve 32 has a middle portion extending between the first seal end 321 and the second seal end 322. The valve 32 includes a hole 323 extending through the middle portion and defining two open ends.

(12) A biasing member 33 acts on the valve 32 in a direction towards the outlet port 302. The discharge passage 31 has an outlet end 313 defining an opening on a wall of the second section 312. The second section 312 is wider than the opening. The biasing member 33 includes an end abutting the valve 32 and another end abutting the wall.

(13) A passage 34 allows air to flow out of the air pump 10. The passage 34 has a first end connected to the cylinder 20, a second end connected to the inlet port 301 of the storage tank 30, and a third end connected to the outlet end 313. The passage 34 includes a first passage 341 having one distal end connected to the cylinder 20 and another distal end bifurcating into a second passage 342 and a third passage 343. The second passage 342 has one distal end connected to the first passage 341 and another distal end connected to the inlet port 301. The third passage 343 has one distal end connected to the first passage 341, a middle end connected to the outlet end 313, and another distal end that allows air to flow out of the air pump 10. The control 35 is disposed in the second passage 342. The second passage 342 includes a narrower section and a wider section and defines an orifice between the narrower and wider sections.

(14) The passage 34 includes a control 35 disposed therein. The control 35 is operable for selectively stopping air flowing into the storage tank 30 through the inlet port 301. The control 35 includes a plug 37 engaging in the orifice, a second biasing member 39 including one end abutting the plug 37 and another end abutting a wall of the wider section, and a cam 41 acting on the plug 37 and counteracting the second biasing member 39.

(15) A one-way seal device 43 is disposed in the passage 34. The one-way seal device 43 prevents air flowing in the passage 34 flowing reversely into the cylinder 20. The one way seal device 43 includes a block 45 and a biasing member 47 biasing the block 45. The one-way seal device 43 is located between the pumping system 2 and the control 35.

(16) When the control 35 is disposed in a first position, as shown in FIG. 2, air is pumped into the storage tank 30 via the first and second passages 341 and 342 upon operation of the pumping system 2. Furthermore, when the control 35 is disposed in a second position, as shown in FIG. 4, air is pumped out of the air pump 10 via the first and third passages 341 and 343 upon operation of the pumping system 2.

(17) As shown in FIG. 2, as the pumping system 2 pumps air into the storage tank 30, the pressure inside the storage tank 30 increases. When the pressure is not high enough, air is unable to overwhelm the biasing member 33 to urge the valve 32 from the first position to the second position. The valve 32, disposed in the first position, stops air in the storage tank 30 flowing out of the outlet port. As shown in FIG. 3, when the storage tank 30 stores sufficient volumes of air and the pressure inside is high enough, air can supply enough force to urge the valve 32 to the second position. The valve 32, disposed in the second position, allows air in the storage tank 30 to flow out of the outlet port 302 and into the discharge passage 31. Furthermore, when the first seal end 321 disengages from the first section 311, a gap is created between the first seal end 321 and the periphery of the second section 312. The hole 323 includes one open end connected to the gap and another open end connected to the second section 312. Therefore, air in the storage tank 30 flows out of the outlet port 302, and into the discharge passage 31 through the gap and the open ends of the hole. Furthermore, as the volumes of air inside the storage tank 30 decrease, the valve 32 will start moving from the second position to the first position.

(18) In view of the forgoing, the outlet port 302 of the storage tank 30 can be opened/closed automatically by the valve 32. When the control 35 is disposed in the first position, air is pumped into the storage tank 30 upon operation of the pumping system 2. Furthermore, when the control 35 is disposed in the second position, air is pumped out of the air pump 10 upon operation of the pumping system 2.

(19) The foregoing is merely illustrative of the principles of this invention, and various modifications can be made by those skilled in the art without departing from the scope and spirit of the invention.