Suction valve and an endoscope

1. A suction valve, comprising an outer shell, a shaft, and two or more second sealant rings;

wherein the outer shell is hollow, and is provided with a pressing part at a top of the outer shell and a first opening in a side wall of the outer shell;

the shaft is embedded into the outer shell and is connected to the pressing part; the shaft is provided with a second opening at the bottom and a third opening in a side wall of the shaft respectively, and the second opening is in communication with the third opening;

the two or more second sealant rings are each sleeved on the shaft, wherein a part below the third opening is transversely raised to form a first projection, a second projection is transversely raised at the second opening, one of said second sealant rings is sleeved between the first projection and the third opening, and another of said sealant rings is sleeved above the second projection to form two longitudinal compression sealing layers;

as the pressing part is pressed, the shaft moves downward such that the third opening is in communication with the first opening.

2. The suction valve as claimed in claim 1 , wherein the pressing part comprises a first cap and a spring; the spring is sleeved on the shaft, with one end of the spring being attached within the outer shell, and the other end of the spring butting against the first cap.

3. The suction valve as claimed in claim 2 , wherein a sealing gasket is provided between the first cap and the spring.

4. The suction valve as claimed in claim 2 , wherein the pressing part further comprises a second cap; the second cap is sleeved on the top of the outer shell, and a cushion space is provided between the first cap and the second cap.

5. The suction valve as claimed in claim 4 , wherein the second cap is made of a soft rubber material.

6. The suction valve as claimed in claim 4 , wherein a plurality of air inlets are provided in a top of the side wall of the outer shell.

7. The suction valve as claimed in claim 6 , wherein the air inlets comprises a first air inlet and a second air inlet; the first air inlet is located directly above the first opening; the second air inlet is provided opposite to the first air inlet.

8. The suction valve as claimed in claim 7 , wherein the second cap is provided with a first through-hole adapted to the size of the first air inlet, on the side of the first air inlet; the first through-hole is aligned with the first air inlet.

9. The suction valve as claimed in claim 7 , wherein the second cap is provided with a second through-hole adapted to the size of the second air inlet, on the side of the second air inlet; the second through-hole is aligned with the second air inlet.

10. The suction valve as claimed in claim 7 , wherein the first air inlet is of the same size as the second air inlet.

11. The suction valve as claimed in claim 1 , wherein the outer shell is provided with a fourth opening on a side opposite to the first opening.

12. An endoscope, comprising a first pipe, a second pipe and a suction valve;

wherein the suction valve comprises an outer shell, a shaft, and two or more second sealant rings, and wherein the outer shell is hollow, and is provided with a pressing part at a top of the outer shell and a first opening in a side wall of the outer shell; the shaft is embedded into the outer shell and is connected to the pressing part; the shaft is provided with a second opening at the bottom and a third opening in a side wall of the shaft respectively, and the second opening is in communication with the third opening; the two or more second sealant rings are each sleeved on the shaft, wherein a part below the third opening is transversely raised to form a first projection, a second projection is transversely raised at the second opening, one of said second sealant rings is sleeved between the first projection and the third opening, and another of said second sealant rings is sleeved above the second projection to form two longitudinal compression sealing layers; and as the pressing part is pressed, the shaft moves downward such that the third opening is in communication with the first opening;

an upper part of the first pipe is provided with a cavity for accommodating the suction valve, an opening of the cavity being in communication with the second opening of the shaft;

the first opening of the outer shell is connected to the second pipe.

13. The endoscope as claimed in claim 12 , wherein a first sealant ring is sleeved on the outer shell, and is compressed between the outer shell and an inner wall of the first pipe.

14. The endoscope as claimed in claim 12 , wherein the first pipe is configured to be inserted into the human body to aspirate polyps and or tissue fluid from the human body, and the second pipe is configured to be connected with a pneumatic pump of the endoscope.

15. The endoscope as claimed in claim 12 , wherein the pressing part comprises a first cap, a spring, and a sealing gasket provided between the first cap and the spring; the spring is sleeved on the shaft, with one end of the spring being attached within the outer shell, and the other end of the spring butting against the first cap.

16. The endoscope as claimed in claim 15 , wherein the pressing part further comprises a second cap; the second cap is sleeved on the top of the outer shell, and a cushion space is provided between the first cap and the second cap.

17. The endoscope as claimed in claim 12 , wherein a first air inlet and a second air inlet are provided in the top a top of the side wall of the outer shell; the second air inlet is provided on a side opposite to the first air inlet.

18. The endoscope as claimed in claim 17 , wherein the second cap is provided with a first through-hole on the side of the first air inlet, and a second through-hole adapted to the size of the second air inlet; the first through-hole is aligned with the first air inlet; the second through-hole is aligned with the second air inlet.

19. An endoscope, comprising a first pipe, a second pipe and a suction valve,

wherein the suction valve comprises an outer shell, a shaft, a first sealant ring, and at least one second sealant rings sleeved outside the shaft, and wherein the outer shell is hollow, and is provided with a pressing part at a top of the outer shell and a first opening in a side wall of the outer shell; the shaft is embedded into the outer shell and is connected to the pressing part; the shaft is provided with a second opening at the bottom and a third opening in a side wall of the shaft, and the second opening is in communication with the third opening, wherein a part below the third opening is transversely raised to form a first projection, a second projection is transversely raised at the second opening, one of said second sealant rings is sleeved between the first projection and the third opening, and another of said second sealant rings is sleeved above the second projection to form two longitudinal compression sealing layers; as the pressing part is pressed, the shaft moves downward such that the third opening is capable of communication with the first opening;

the suction valve is accommodated in an upper part of the first pipe, with the second opening of the shaft being communicated with the first pipe; the first opening of the outer shell is connected to and communicated with the second pipe;

the first sealant ring is sleeved outside the outer shell, and is compressed between the outer shell and an inner wall of the first pipe.