Bidirectional self-locking damper

1. A bidirectional self-locking damper, comprising a cylinder sealed with a work medium and a piston assembly housed in the cylinder and displaceable along the axial direction of the cylinder, wherein the piston assembly comprises:

a piston rod, that comprises a working portion extending into the cylinder and a first mounting portion extending out of the cylinder;

a piston that is connected to the working portion and divides the cylinder into a recovery pressure chamber and a compression pressure chamber; and

a bidirectional self-locking valve that is connected to the working portion, the bidirectional self-locking valve comprising:

a valve body that is provided with a passage chamber and a first passage channel and a second passage channel that are communicated with the passage chamber, the first passage channel communicating with the recovery pressure chamber, and the second passage channel communicating with the compression pressure chamber;

a locking assembly that is placed in the passage chamber;

wherein the locking assembly is directed to displace in the passage chamber driven by the work medium for establishing/interrupting the communication between the first passage channel or the second passage channel and the passage chamber;

wherein the locking assembly is used to establish or interrupt the communication between the passage chamber and one of the first passage channel and the second passage channel, so that the other passage channel is always kept in communication with the passage chamber;

wherein the locking assembly comprises:

a spool unit that comprises a main body and a first locking portion and a second locking portion that are respectively connected at both sides of the main body for establishing or interrupting the communication between the first passage channel or the second passage channel and the passage chamber; and

an elastic compensation unit that is distributed on both sides of the main body for forcing the spool unit to perform resetting movement; and

wherein the first locking portion comprises a first tip, the second locking portion comprises a second tip, the first tip and the second tip both have a tapered sealing surface, and one of the tapered sealing surfaces is provided with a diversion section; when the tapered sealing surface with the diversion section abuts against the opening of the first passage channel/the second passage channel, an overflow port that is communicated with the passage chamber is formed between the first passage channel/the second passage channel and the diversion section.

2. The bidirectional self-locking damper according to claim 1 , wherein the main body divides the passage chamber into a first chamber and a second chamber, and an outer peripheral surface of the main body abuts against the inner wall of the passage chamber, and the main body is provided with at least one damping channel communicating the first chamber with the second chamber.

3. The bidirectional self-locking damper according to claim 1 , wherein the valve body comprises a valve seat and a valve cover;

the passage chamber and the first passage channel are provided in the valve seat, and a locking groove communicating with the passage chamber is provided in one end of the valve seat;

the second passage channel is provided on the valve cover;

the valve cover comprises a base and an extension portion connected to one end of the base, an outer peripheral surface of the base is in sealing connection with the inner wall of the locking groove, and an end face of the base abuts against the bottom of the locking groove and forms a first sealing portion, and the extension portion is introduced into the passage chamber from one end of the base.

4. The bidirectional self-locking damper according to claim 3 , wherein an outer peripheral surface of the valve seat and the inner wall of the damping chamber are in a sealed connection, and an end face of the valve seat and an end face of the working portion abut and form a second sealing portion.

5. The bidirectional self-locking damper according to claim 1 , wherein the working portion has a damping chamber communicating the recovery pressure chamber with the compression pressure chamber, and the bidirectional self-locking valve is mounted in the damping chamber.

6. The bidirectional self-locking damper according to claim 5 , wherein the piston rod is provided with an inlet channel and a transfer channel, the inlet channel communicates the recovery pressure chamber with the transfer channel, and the transfer channel communicates with the damping chamber; wherein the inlet channel and the transfer channel are communicated and form an angle.

7. The bidirectional self-locking damper according to claim 6 , wherein the damping chamber has a flaring communicating with the transfer channel.