Quick coupler structure

A quick coupler structure comprising:

• a male coupler including a male coupler upper housing, a male coupler lower housing, a connecting tube with a connection end and an opposite plug end each with a different outer diameter than the other, the connecting tube further having a first stepped section formed intermediate the connection end and the plug end of the connecting tube, a second sealing member, and a fixed valve core having a first spring fitted therearound and having an end fixed to an inner side of the male coupler and another end extended into the connecting tube;
• the male coupler upper housing being assembled to the male coupler lower housing, the connecting tube being slidably fitted in a lower end of the male coupler lower housing so as to be able to reciprocate in an axial direction therewith and being provided at the connection end and on an outer surface with at least a first annular groove with the second sealing member fitted in the first annular groove so as to provide radial sealing between the connecting tube and the male coupler lower housing during reciprocating motion of the connecting tube, and wherein the plug end of the connecting tube is retractable into and extendable outward from the male coupler lower housing in reciprocating motion, wherein the first stepped section is configured to engage with an interior shoulder of the male coupler lower housing to inhibit the connecting tube from detaching during the reciprocating motion;
• and
• a female coupler having a female coupler upper housing, a female coupler lower housing, and a tubular sliding sleeve;
• the female coupler upper housing and the female coupler lower housing being assembled to define in between them a valve traveling space;
• a third spring being externally fitted around the female coupler upper housing, and the tubular sliding sleeve being slidably fitted around an outer side of the female coupler upper housing and the third spring;
• the female coupler upper housing internally defining a coupling platform provided with a central thru-hole and a sealing member receiving recess for receiving a third sealing member therein;
• and a movable valve and a second spring being movably fitted in the valve traveling space, and the second spring having an upper end pushing the movable valve upward to close the central thru-hole of the coupling platform;
• and wherein when the male and the female couplers are connected to each other, the connecting tube can be retracted into the male coupler, such that the end of the fixed valve core extended into the connecting tube is exposed from the connecting tube to engage with and push against the movable valve, causing the movable valve to move in a direction opposite to the coupling platform to open the central thru-hole of the coupling platform, so that the assembled male and female couplers internally provide an unblocked passage for a fluid being transferred to flow therethrough freely, wherein the second sealing member and the first stepped section are cooperatively configured to ensure dynamic radial sealing and inhibit detachment of the connecting tube during reciprocating motion, thereby achieving structural and sealing stability under high-pressure conditions,
• wherein the movable valve includes a valve base and a valve head;
• the valve base being upward extended from a top side to form the valve head and having a plurality of circumferentially equally or non-equally spaced cuts;
• and the valve head being provided on its circumferential outer surface with at least one groove for receiving a fourth sealing member each.