Contact-type gas seal device

Abstract

This invention discloses a contact-type gas sealing device, comprising: a pressure cap element, including a front end cap and a rear end cap; a sealing element disposed within the pressure cap element; the sealing element being configured to rotate with a rotating shaft; wherein, the inner end face of the front end cap and the end face of the first sealing ring of the sealing element form a first friction pair, and the inner end face of the rear end cap and the end face of the second sealing ring of the sealing element form a second friction pair; a cylindrical space is formed between the inner circumferential surface of the pressure cap element, the inner end face of the front end cap, the inner end face of the rear end cap, and the outer circumferential surface of the sealing element; a gas inlet communicating with the cylindrical space is provided on the pressure cap element for connecting an external gas source to inject pressurized gas into the cylindrical space; a gas guiding groove is provided on at least one contact end face of the first friction pair, the gas guiding groove extending from the radial center of the first friction pair to the outer diameter of the friction, and symmetrically distributed circumferentially, so as to guide the pressurized gas in the cylindrical space to the contact surface of the first friction pair.

Claims

1. A contact-type gas sealing device for installation between a housing (8) of a rotating device and a rotating shaft (9) passing through the housing (8), for sealing solid or high-viscosity materials within the device, characterized in that the contact-type gas sealing device comprises: A pressure cap element (20) includes a front end cap (2) and a rear end cap (1), which are axially connected by fasteners (6). The front end cap (2) is configured to be fastened to the housing (8) by connecting bolts (11). A sealing element (13) is disposed within the pressure cap element (20) and includes a first sealing ring (4), an elastic sealing ring seat (3), and a second sealing ring (5). The three are connected by embedding or friction to form an integral whole and are configured to rotate with the rotating shaft (9). The inner end face of the front end cap (2) and the end face of the first sealing ring (4) form a first friction pair (17), and the inner end face of the rear end cap (1) and the end face of the second sealing ring (5) form a second friction pair (18). A cylindrical space (16) is formed between the inner circumferential surface of the pressure cap element (20), the inner end face of the front end cap (2), the inner end face of the rear end cap (1), and the outer circumferential surface of the sealing element (13). The pressure cap element (20) is provided with a gas inlet (10) communicating with the cylindrical space (16) for connecting an external gas source to inject pressurized gas into the cylindrical space (16); At least one contact end face of the first friction pair (17) is provided with a gas guiding groove (14), which extends from the radial center of the first friction pair (17) to the outer diameter of the friction and is symmetrically distributed along the circumference to guide the pressurized gas in the cylindrical space (16) to the contact surface of the first friction pair (17).

2. The contact-type gas sealing device as claimed in claim 1, wherein a vent (12) is provided on the end face of the first sealing ring (4) or the end face of the front cover (2); the vent (12) is configured to communicate with the gas guide groove (14) at least partially at all times when the rotating shaft (9) rotates, and simultaneously communicate with the cylindrical space (16) or the gas inlet (10).

3. The contact-type gas sealing device as claimed in claim 1, wherein the gas guide groove (14) is disposed on the end face of the first sealing ring (4) facing the front end cover (2).

4. The contact-type air-sealing device as claimed in claim 1, wherein the air guide groove (14) is disposed on the end face of the front end cover (2) facing the first sealing ring (4).

5. The contact-type gas seal device as claimed in claim 1, wherein the gas guide groove (14) partially or completely penetrates the first friction pair (17) along the axial direction.

6. The contact-type gas seal device as claimed in claim 2, wherein the vent (12) is symmetrically distributed circumferentially.

7. The contact-type gas sealing device as claimed in claim 1, wherein the pressure of the pressurized gas is at least 0.5 BAR greater than the pressure of the material inside the device.

8. The contact-type gas sealing device as claimed in claim 1, wherein a valve switching device and / or a pressure and flow rate adjustment and detection device are provided between the external gas source and the gas inlet (10).

9. The contact gas sealing device as claimed in claim 1, wherein the pressurized gas is nitrogen, carbon dioxide or air.

10. The contact-type gas sealing device as claimed in claim 1, wherein the elastic sealing ring seat (3) is made of rubber and plastic material, the hardness of which is less than the material hardness of the first sealing ring (4) and the second sealing ring (5).

11. The contact-type gas sealing device as claimed in claim 1, wherein the sealing element (13) is configured to float relative to the gland element (20) in the axial and radial directions.

12. The contact-type air-sealing device as claimed in claim 1, wherein an adjusting shim (15) is provided between the front end cover (2) and the rear end cover (1) for adjusting the axial length of the pressure cap element (20).

13. The contact-type gas seal device as claimed in claim 1, wherein the components of the contact-type gas seal device are formed as an integral structure, a split structure, or a combination of both, with the splits connected by gaskets or transitions.

14. The contact-type gas seal device as claimed in claim 2, wherein the vent (12) is configured to provide collection and storage space in the event of instantaneous material leakage.

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