Nozzle for inflating a balloon

1. A nozzle for inflating a balloon, comprising a coupling portion having an inner end and an outer end opposite to the inner end in a longitudinal direction, wherein the coupling portion further including an air hole extending from the inner end through the outer end in the longitudinal direction, wherein the nozzle further comprises an expansion portion spaced from the coupling portion and a connecting portion connected between the expansion portion and the inner end of the coupling portion, wherein the expansion portion includes a first face spaced from the inner end in the longitudinal direction and a second face opposite to the first face, wherein the expansion portion further includes a peripheral edge located between the first face and the second face, wherein the peripheral edge is configured to spread a neck of the balloon, wherein the nozzle is configured to couple with the neck, wherein the expansion portion is configured to be received in the neck of the balloon and is configured to spread the neck, wherein the air hole intercommunicates with an inflation space defined in the balloon when a gas with a sufficient pressure is filled into the air hole, permitting the gas to enter the inflation space, and wherein the air hole does not intercommunicate with the inflation space defined in the balloon when no gas with the sufficient pressure is filled into the air hole, wherein the neck of the balloon is spaced from the first face and the peripheral edge to intercommunicate the air hole with the inflation space when the gas with the sufficient pressure is filled into the air hole, wherein the peripheral edge and a portion of the first face abut against the neck of the balloon when no gas with the sufficient pressure is filled into the air hole, wherein the peripheral edge is radially outwards of the air hole, wherein the connecting portion includes a plurality of connecting beams spaced from each other in an annular direction around a longitudinal axis of the air hole and located radially outwards of the air hole, wherein each of the plurality of connecting beams is connected between the first face of the expansion portion and the inner end of the coupling portion, wherein each two adjacent beams have an opening therebetween, wherein each opening is located radially outwards of the air hole, intercommunicates with the air hole, and extends between the first face of the expansion portion and the inner end of the coupling portion in the longitudinal direction, and wherein the gas with the sufficient pressure flows from the air hole through the openings, flows along the first face of the expansion portion, flows through a gap between the peripheral edge and the balloon into the inflation space of the balloon.

2. The nozzle for inflating the balloon as claimed in claim 1 , wherein the coupling portion further includes an outer periphery having an insertion groove between the inner end and the outer end, and wherein the insertion groove is configured to couple with an open end at a distal end of the neck of the balloon.

3. The nozzle for inflating the balloon as claimed in claim 2 , wherein the coupling portion further includes a coupling groove between the insertion groove and the outer end, and wherein the coupling groove is configured to couple with one of a plurality of holders of a clamping board.

4. The nozzle for inflating the balloon as claimed in claim 1 , wherein the expansion portion is solid to prevent the gas from flowing from the inner face through the second face, and wherein both the first face and the second face are conic.

5. The nozzle for inflating the balloon as claimed in claim 4 , wherein the openings are radially inwards of the peripheral edge.

6. The nozzle for inflating the balloon as claimed in claim 1 , wherein the coupling groove further includes a flange between the insertion groove and the inner end, and wherein the flange is configured to spread the neck of the balloon.