CN2132003Y - Air valve type piston for inflator - Google Patents

Abstract

The utility model discloses an air valve type piston for an inflator, comprising an oblate piston body, an O-shaped rubber seal ring and a check valve arranged on the side part of the piston body. The utility model has the advantages of high air inflation efficiency, the large pressure of deferent compressed air, and high durability; the utility model has the advantage that wearing seal components can be replaced easily.

Description

Air valve type piston for inflator

The utility model relates to a kind of inflator piston, especially for the piston of the manpower inflator that the pneumatic tire of means of transportation such as bicycle, tricycle, tired barrow is inflated.

Existing inflator piston all is the bowl-shape leather bucket made from rubber or leather, there is a hole at its middle part, so that tailpiece of the piston rod penetrates, with nut and pad piston is fixed on rod end, this piston resembles the bowl that a back-off and places in the inflator, and its external diameter and inflator internal diameter adapt.When piston rod is pulled out, air enters in the inflator pressing chamber from the periphery of leather bucket and the gap location of cylinder inner wall, in the time of in piston rod presses downward to inflator, air in the inflator pressing chamber is with leather cup periphery distending, make leather cup periphery and cylinder inner wall jam-packed, air in the pressing chamber can't leak from the leather cup periphery, can only be pressed in the tire through outlet valve, outlet pipe.But, it is just suitable that the peripheral external diameter of this leather bucket is difficult to make with the inflator internal diameter, when the external diameter of leather bucket is big slightly, it cooperates tightr with the inflator endoporus, when piston rod is upwards pulled out, extraneous air is difficult for entering in the pressing chamber of inflator, presses large-minded subtracting thereby make, and reduces to inflate efficient.When inflator uses a period of time, during the leather bucket wearing and tearing, it cooperates with the inflator endoporus and is too loose, when being pressed into piston rod, the air that has entered pressing chamber is easy to again leak away from the piston periphery, makes to be pressed into the large-minded of tire and to subtract, and also can reduce to inflate efficient, even can't make tyre inflation, the leather bucket that have to more renew at this moment at all.

Task of the present utility model is exactly the shortcoming that will overcome above-mentioned leather bucket, and a kind of efficient height of inflating is provided, and is durable in use, the easily changeable novel inflator piston in wearing and tearing back.

Task of the present utility model is finished like this: novel inflator piston has an oblate piston body that central part is porose, be shaped on annular groove on the periphery of piston body, be placed with zero shape rubber seal in the groove, there is an one-way valve that connects the piston body two ends in the other portion of piston body, this one-way valve is preferably by the shoulder hole that connects the piston body two ends with place the ball of the macropore of shoulder hole to form, there is the obstacle that prevents that ball from dropping out from macropore at the place, outer end of macropore, this obstacle is preferably horizontal to be inserted in pin in the pin-and-hole at big outer end of hole place, it also can be the closing in flange that becomes in the impact extrusion of macropore external port, ball can be a steel ball, also can be the nonmetal ball of other Metal Ball or hard, as glass marble or ceramic ball.The hole in piston center portion can be circular unthreaded hole, also can be tapped hole, can also be square unthreaded hole.Because dress is to seal with contacting of cylinder inner wall by zero shape rubber seal in the piston body periphery annular groove with inflator of the present utility model, thereby good sealing effect, during air inlet, ball falls under the effect of deadweight, the aperture that breaks away from shoulder hole is opened one-way valve, and air inlet is smooth.When calming the anger, ball rises under the effect of pressing chamber atmospheric pressure, withstands the microstome of shoulder hole, make closed check valve, the air in the pressing chamber can't leak from piston, almost all is pressed in the tire, thereby it inflates the efficient height, and the compressed air pressure of sending is big.The frictional position of ○Xing Mifengquan can be adjusted voluntarily or artificially, thereby durable in use.The sealing circle is again a standard piece, also very easily after the wearing and tearing has bought replacing.

Fig. 1 is that a kind of center hole according to the utility model design is the sectional view of the oblate inflator piston of tapped hole, Fig. 2 be its A to view, Fig. 3 is that inflator piston shown in Figure 1 is contained in the schematic representation in the single tube hand pump.

With reference to accompanying drawing, it is oblate that piston body 1 is, its center porose 2, this hole is a tapped hole, can be tightened on the screw thread of piston rod the inner, annular groove 3 is arranged on the periphery of piston body 1, be provided with zero shape rubber seal 4 in the annular groove 3, there is an one-way valve 5 in other portion at piston body 1, and this one-way valve 5 is made of shoulder hole 6 that runs through piston body 1 two ends and ball 7 wherein, and ball 7 is placed in the macropore 61 of shoulder hole 6 and can be free therein movable, the external diameter of ball 7 is bigger than the diameter of the aperture 62 of shoulder hole 6, when ball 7 is pressed in the place, aperture of aperture 62, aperture can be shut, thereby make closed check valve.At place, the outer end of macropore 61, radially be drilled with pin-and-hole 8 inwards from the cylindrical of piston body 1 and pass across macropore 61, insert pin 9 in the pin-and-hole 8, drop out from macropore 61 in order to prevent ball 7.As shown in Figure 3: when piston rod 10 is upwards pulled out (among the figure shown in the double dot dash line), ball 7 leaves the aperture of aperture 62 under action of gravity, drop on the pin 9 and blocked by it, drop out and be unlikely, one-way valve 5 is opened, ambient air enters 11 li of the pressing chambers of inflator bottom through aperture 62 from inflator top, when piston rod 10 presses downward in the inflator (among the figure shown in the solid line), air in the pressing chamber 11 is with ball 7 jack-up, hold out against on the aperture of aperture 62, the duct is blocked, and this moment, one-way valve 5 was closed, and the air in the pressing chamber 11 is pressed in the tire through outlet valve and outlet pipe.The utility model can be made the product of plurality of specifications by the specification of zero shape rubber seal, shoulder hole also can design according to the size of existing commercially available steel ball and make, though thereby structure of the present utility model is than the complexity of existing leather bucket, its manufacturing is not difficult.It inflates the high and long-lived advantage of efficient is that leather bucket is incomparable.The pressure that the utility model can bear is also more much higher than the leather bucket, and piston more down, and compression ratio is bigger, and air-resilient power is bigger, and sealing is tighter, thereby the pressurized air of exportable elevated pressures.The utility model is not only applicable to the manpower inflator, is applicable to various machine inflators yet.

Claims (5)

1, a kind of inflator piston, the central part of its oblate piston body 1 is porose 2, and periphery has annular groove 3, and O shape rubber seal 4 is arranged in the annular groove 3, it is characterized in that: the other portion at piston body 1 also has an one-way valve 5.

2, by the described inflator piston of claim 1, it is characterized in that: one-way valve 5 is made of shoulder hole 6 that runs through piston body 1 two ends and the ball 7 that is placed in one, at the place, outer end of the macropore 61 of shoulder hole 6 obstacle that prevents that ball 7 from dropping out from macropore is arranged.

3, by the described inflator piston of claim 2, it is characterized in that: the obstacle at the place, outer end of the macropore 61 of shoulder hole 6 is the pin 9 that inserts in the pin-and-hole 8 that passes across macropore 61.

4, by the described inflator piston of claim 2, it is characterized in that: the obstacle at the place, outer end of the macropore 61 of shoulder hole 6 is the closing in flange that impact extrusion becomes.

5, by the described inflator piston of claim 1 to 4, it is characterized in that: the hole 2 of piston body 1 central part is a tapped hole.

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