Title:
Anti-jammed air pump
Kind Code:
A1


Abstract:
An anti-jammed air pump includes a shell, the shell has a motor, a diaphragm and an internal seat inside, an air chamber is formed between the diaphragm and the internal seat, the internal seat has inlets and outlets, the inlets or outlets have unidirectional disc respectively; diaphragm connects with the driving shaft of motor via a coupling device, an eccentric shaft and an eccentric gear, the shell has inlet coupling devices and outlet coupling devices which corresponding to the inlets and outlets in respective internal seats; a stress relief groove communicating the inside and outside of the air chamber is positioned in the edge of said internal seat which connects with the diaphragm.



Inventors:
Chang, Kunlin (Xiamen City, CN)
Application Number:
12/121276
Publication Date:
02/19/2009
Filing Date:
05/15/2008
Primary Class:
International Classes:
F04B45/04
View Patent Images:
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Primary Examiner:
HERRMANN, JOSEPH S
Attorney, Agent or Firm:
GREER, BURNS & CRAIN, LTD (CHICAGO, IL, US)
Claims:
1. An anti-jammed air pump comprising: a shell, the shell having a motor, a diaphragm and an internal seat inside, an air chamber is formed between the diaphragm and the internal seat, the internal seat has inlets and outlets, the inlets or outlets have unidirectional disc respectively; the diaphragm connects with the driving shaft of motor via a coupling device, an eccentric shaft and an eccentric gear, the shell has inlet coupling devices and outlet coupling devices which corresponding to the inlets and outlets in internal seat respectively; wherein a stress relief groove communicating the inside and outside of the air chamber is positioned in the edge of said internal seat which connects with the diaphragm.

2. The anti-jammed air pump as defined in claim 1, wherein the edge part of said internal seat, which connects with the diaphragm, is protruding toward the diaphragm, the middle part of internal seat recess, the protruding edge part has an annular groove, and the corresponding position of diaphragm has a cooperating protruding ring; said stress relief groove crosses to said annular groove.

3. The air pump as defined in claim 2, wherein, wherein the section shape of said relief groove is an arc, a triangle or a rectangle.

4. The anti-jammed air pump as defined in claim 1, wherein said shell forms the first chamber and second chamber being arranged from left to right inside, said motor is positioned in the first chamber, the driving shaft of motor is protruding into the second chamber; an opening is positioned in the top cover of the second chamber, and said diaphragm is positioned on the opening, said internal seat is positioned on the diaphragm, a top-cover is positioned on the internal seat, said inlet coupling and the outlet coupling are positioned on the top-cover.

Description:

FIELD OF THE INVENTION

The present invention relates to an air pump, more particularly to an air pump having improved anti-jammed structure.

BACKGROUND OF THE INVENTION

Air pumps include compressors and vacuum pumps. Their main structures and working principles are as follows: a diaphragm is positioned between the shell and internal seat, then an air chamber is formed between the diaphragm and the internal seat; the internal seat has inlets and outlets which communicated to the outside, both the inlet and outlet are unidirectional and are reverse-direction to each other; the diaphragm connects the driving shaft of motor via a connecting shaft and an eccentric gear. when the motor begin working, driven by the eccentric gear, the diaphragm would move up or down, thus the chamber suck through the inlet or exhaust through outlet.

In the above-mentioned working process, every time when the chamber finished an exhaust, the diaphragm would be adhibit to the internal seat, and when the outer air pressure is higher than inner air pressure of the chamber, the diaphragm would be adhibit to internal seat tightly, so if the power is off in that time, it would happen that the motor could not drive the diaphragm back, this cannot-working state is namely pump-jammed.

To solve the pump-jammed problem, the present inventor had provided a utility model with the title name as “anti-jammed vacuum pump” and had been authorized by SIPO, the authorized number is CN200520080875.3. the prior art is to carve a groove in the inside of internal seat surface between the inlet and outlet to communicate them to solve the pump-jammed problem. When the exhaust step is finished, the diaphragm would not be adhibit to the internal seat too tightly. But we find this anti-jammed structure is not ideal enough after practices.

SUMMARY OF THE INVENTION

The present invention provides an anti-jammed air pump, and the primary purpose is to mitigate the being easy-jammed drawback of existing air pumps when they are in working state as above-mentioned.

The present invention provides an art as follows: an anti-jammed pump comprises a shell, the shell has a motor, a diaphragm and an internal seat inside, an air chamber is formed between the diaphragm and the internal seat, the internal seat has inlets and outlets, the inlets or outlets have unidirectional disc respectively; diaphragm connected with the driving shaft of motor via coupling device, eccentric shaft and eccentric gear, the shell has inlet coupling devices and outlet coupling devices which corresponding to the inlets and outlets in internal seat respectively; a stress relief groove communicating the inside and outside of the air chamber is positioned in the edge of said internal seat in which connecting with the diaphragm.

The edge part of internal seat of above-mentioned anti-jammed air pump, in which connecting with the diaphragm, is protruding toward the diaphragm, the middle part of internal seat recess, the protruding edge part has an annular groove, and the corresponding position of diaphragm has a cooperating protruding ring; said stress relief groove crosses to said annular groove.

Still more, the section shape of said relief groove is arc, triangle or rectangle.

And, the shell forms first chamber and second chamber arranging from left to right inside. Said motor is positioned in the first chamber, the driving shaft of the motor is protruding into second chamber; an opening is positioned in the top cover of second chamber, and said diaphragm is positioned on the opening, said internal seat is positioned on the diaphragm, a top-cover is positioned on the internal seat, said inlet coupling and outlet coupling are positioned on the top-cover.

By above-mentioned structure and through repeatedly experiments, according to existing technology, the present invention has advantages as follows: the stress relief groove does not affect the suction and exhaust action of the air chamber or affects gently in normal working state, but when the pump-jammed state happened, the stress relief groove would help the air chamber to decompress to release from pump-jammed state.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of the present invention.

FIG. 2 is a perspective view of the internal seat of the present invention.

FIG. 3 is a partial enlargement view of the part A of FIG. 2

FIG. 4 is a frontal view of diaphragm of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Detailed embodiments of the present invention will be described with reference to the appended drawings.

As shown in FIG. 1, an air pump with improved structure, comprises shell 1, shell 1 forms first chamber 11 and second chamber 12 arranging from left to right inside, motor 12 is positioned in first chamber 11, the driving shaft 21 of motor 2 is protruding into second chamber 12.

The top cover of second chamber 12 has an opening 1200, diaphragm 3 is positioned on the opening 1200, and internal seat 4 is positioned on diaphragm 3, the edge of diaphragm 3 is positioned between the edge of opening 1200 and the edge of internal seat 4. an air chamber is formed between diaphragm 3 and internal seat 4, and as is shown in FIG. 2, the internal seat 4 has inlet 420 and outlet 410, the inlet 420 and outlet 410 has unidirectional disc respectively. Diaphragm 3 recess downwards, the bottom of the recess has a coupling device 31, coupling device 31 connected to driving shaft 21 of motor 2 via eccentric shaft 23 and eccentric gear 22.

As is shown in FIG. 2 and FIG. 3, the edge 40 of said internal seat 4 in which connecting with diaphragm 3 is protruding to the diaphragm 3, and the middle part of internal seat recess, inlet 420 and outlet 410 is positioned in the recess part. The edge 40 of the protruding part has an annular groove 401 in circumferential direction and a relief groove 402 in radial direction, the relief groove 402 communicates the inside and outside of the air chamber between internal seat 4 and diaphragm 3. As is shown in FIG. 4, the corresponding position of diaphragm 3 has a protruding ring 30 matching said annular groove 401 to seal off. said relief groove 402 crosses to said annular groove 401. the relief groove 402 does not affect the suction and exhaust of chamber or affects gently in normal working state, but when the pump-jammed state happened, the stress relief groove would help the air chamber to decompress to release from pump-jammed state.

the section shape of said relief groove 402 is arc, triangle, rectangle or the other possible shape. The depth of relief groove 402 depends on the air pressure and flux, and can be amended for the pressure need. the structure of the present invention can reach the object of steady-pressure and controlling out-flux.

Top cover 5 is positioned on the internal seat 4, inlet coupling device 52 and outlet coupling device 51 are positioned on the top cover which corresponding to the inlet 420 and outlet 410 in internal seat 4. sealing ring 6 is positioned between internal seat 4 and top cover 5 which separates the inlet 420. outlet 410 and the inlet coupling device 52 and outlet coupling device 51.

The side wall of shell 1 near to said chamber 12 has a assembly opening 120, the edge of top cover 5 has a side cover 53 which covering the assembly opening 120. Side cover 53 and said assembly opening 120 locate slidable to each other by groove 531 and tenon 121 in both sides.

When assembly beginned, put the motor 2 into first chamber 11 of shell 1 from the right side as is shown in FIG. 1, let the driving shaft 21 to protrude leftward into second chamber 12, and assemble the eccentric gear 22, eccentric shaft 23 and driving shaft 21 of motor 2 in second chamber 12; and, set the diaphragm 3 on opening 1200, wrap eccentric shaft 23 in the coupling device 31 of diaphragm, then assemble internal seat 4, seal pad 6 and top cover 5 onto diaphragm 3 in turn, when the top cover 5 is assembled, side cover 53 assemble with assembly opening 120 from top-down.

When the air pump begin working, the driving shaft 21 of motor 2 drives the eccentric shaft 23 via eccentric gear 22, which make coupling device 31 to repeat up-and-down movement, thus drive diaphragm 3 would be compressed or extended. When the diaphragm 3 is compressed, outlet valve disc 41 will move up to open the outlet 410, and inlet valve disc 42 will move up to close the inlet 420, then the air in air chamber is exhausted through outlet 410 and outlet coupling device 51; when the diaphragm 3 is extended, outlet valve disc 41 will move down to close the outlet 410, and inlet valve disc 42 will move down to open the inlet 420, then the air in air chamber enter the chamber through inlet 420 and inlet coupling 52. the movement circulation repeated as above-mentioned to vacuumize or inflate.

The foregoing description of the exemplary embodiment of the invention has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. many modifications and variations are possible in light of the above teaching. All changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.