Contact-type gas seal device

Abstract

This application discloses a contact-type gas sealing device, comprising: a gland assembly including a front end cover and a rear end cover; a sealing assembly disposed within the gland assembly; the sealing assembly being configured to rotate with a rotating shaft; wherein, the inner end face of the front end cover and the end face of the first sealing ring of the sealing assembly form a first friction pair, and the inner end face of the rear end cover and the end face of the second sealing ring of the sealing assembly form a second friction pair; a cylindrical space is formed between the inner circumferential surface of the gland assembly, the inner end face of the front end cover, the inner end face of the rear end cover, and the outer circumferential surface of the sealing assembly; a gas inlet communicating with the cylindrical space is provided on the gland assembly 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, to guide the pressurized gas in the cylindrical space to the contact surface of the first friction pair.

Description

Technical Field

[0001] This application belongs to the field of sealing technology, and in particular relates to a contact-type air seal device for the rotating shaft of an equipment used to handle solid, semi-solid or high-viscosity fluid materials. Background Technology

[0002] In industries such as chemical, food, and pharmaceutical, equipment such as mixers, blenders, and screw conveyors are widely used to process solid powders, granular materials, or high-viscosity fluids. The rotating shafts of these devices require reliable seals where they pass through the equipment housing to prevent internal material leakage and to prevent external contaminants from entering.

[0003] Currently, such equipment typically operates at low speeds with significant axial or radial runout. Common sealing methods include packing seals, rubber lip seals, and contact mechanical seals. However, these sealing methods have significant drawbacks: packing seals easily wear down the rotating shaft, require frequent adjustments to the clamping force, and have a short service life; rubber lip seals also have a limited lifespan and require a high degree of surface finish on the shaft. Both of these sealing methods result in severe leakage, easily leading to environmental pollution and posing hazards to production and personal safety, and are only suitable for simple applications with low sealing requirements.

[0004] While conventional mechanical seals for fluid applications offer good sealing performance, they typically require high installation precision and are ill-suited to the significant shaft runout and axial movement described above, thus limiting their application. Non-contact dry gas seals, on the other hand, utilize the hydrodynamic effect of gas to form a non-contact gas film between the sealing end faces under high-speed rotation. However, they are not suitable for the contact-type end-face seals described in this technical field for low-speed, heavy-load conditions.

[0005] To improve the performance of contact seals, several improvements have emerged. For example, some technologies use elastic elements to drive the sealing ring and allow it to float to accommodate shaft eccentricity and movement; some technologies increase the sealing preload by using an external air source; and others improve the ambient temperature of the sealing assembly by incorporating an air distribution ring within the sealing cavity.

[0006] However, the improvements in the aforementioned existing technologies share a common drawback: although the external pressurized gas enters the sealing cavity, it only acts on the external space of the sealing friction pair to provide sealing preload or to form isolation from the medium around the friction pair. This method is indirect cooling; the pressurized gas is not precisely guided to the contact area of ​​the sealing end faces that bear direct friction, and effective gas convection cannot be formed between the friction pairs. Therefore, when the operating temperature fluctuates or the equipment speed is too high, the heat generated by the friction pair increases sharply. Due to the lack of direct and effective cooling methods, this leads to severe seal wear and a shortened service life. Frequent downtime for replacement not only affects production efficiency but also increases maintenance costs.

[0007] Therefore, there is an urgent need for a new type of contact-type gas sealing device that can accurately deliver cooling gas to the contact surface of the friction pair while ensuring reliable sealing, thereby forming effective gas convection at the friction surface and solving the problems of severe heat generation, rapid wear, rapid failure, and frequent shutdown maintenance required for sealing friction pairs in powder and slurry mixing and conveying equipment. Summary of the Invention

[0008] The purpose of this application is to overcome the shortcomings of the prior art and provide a contact-type gas sealing device that can accurately deliver cooling gas to the contact surface of the friction pair while ensuring reliable sealing, thereby forming effective gas convection at the friction surface.

[0009] To achieve the above objectives, this application proposes a contact-type gas sealing device, installed between the housing of a rotating device and a rotating shaft passing through the housing, for sealing solid or high-viscosity materials inside the device. The contact-type gas sealing device comprises: a pressure cap assembly, including a front end cap and a rear end cap, the front end cap and the rear end cap being axially connected by fasteners, the front end cap being configured to be fastened to the housing by connecting bolts; and a sealing assembly disposed within the pressure cap assembly, including a first sealing ring, an elastic sealing ring seat, and a second sealing ring, the three being integrally formed by interlocking or friction connection, and configured to rotate with the rotating shaft; wherein the inner end face of the front end cap is flush with the first sealing ring. The end faces form a first friction pair, and the inner end face of the rear end cover and the end face of the second sealing ring form a second friction pair; a cylindrical space is formed between the inner circumferential surface of the pressure cap assembly, the inner end face of the front end cover, the inner end face of the rear end cover, and the outer circumferential surface of the sealing assembly; a gas inlet communicating with the cylindrical space is provided on the pressure cap assembly 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 along the circumference, so as to guide the pressurized gas in the cylindrical space to the contact surface of the first friction pair.

[0010] According to an optional embodiment, a vent is provided on the end face of the first sealing ring or the end face of the front end cover; the vent is configured to be partially connected to the air guide groove at least at some times when the rotating shaft rotates, and simultaneously connected to the cylindrical space or the gas inlet.

[0011] According to an optional embodiment, the air guide groove is disposed on the end face of the first sealing ring facing the front end cover.

[0012] According to an optional embodiment, the air guide groove is disposed on the end face of the front end cover facing the first sealing ring.

[0013] According to an optional embodiment, the air guide groove partially or completely penetrates the first friction pair along the axial direction.

[0014] According to an optional implementation, the ventilation ducts are symmetrically distributed circumferentially.

[0015] According to an optional implementation, the pressure of the pressurized gas is at least 0.5 BAR greater than the pressure of the material inside the equipment.

[0016] According to an optional implementation, 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.

[0017] According to an optional implementation, the pressurized gas is nitrogen, carbon dioxide, or air.

[0018] According to an optional embodiment, the elastic sealing ring seat is made of rubber and plastic material, and its hardness is less than that of the materials of the first sealing ring and the second sealing ring.

[0019] According to an optional implementation, the sealing assembly is configured to float relative to the gland assembly in both the axial and radial directions.

[0020] According to an optional embodiment, an adjusting shim is provided between the front end cover and the rear end cover for adjusting the axial length of the pressure cap assembly.

[0021] According to an optional embodiment, 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 split points connected by gaskets or transition pieces.

[0022] According to an optional implementation, the cylindrical space is configured to provide collection and storage space in the event of instantaneous material leakage.

[0023] Unlike existing indirect cooling methods where gas only acts on the external space of the sealed friction pair, this application provides a gas guide groove extending radially from the center to the outer diameter on the friction sealing surface, allowing pressurized gas to directly enter the contact surface of the friction pair. The flowing gas forms convection at the friction surface, continuously carrying away the heat generated by friction, directly cooling at the heat source, effectively controlling the temperature of the sealing surface, and fundamentally solving the problem of low cooling efficiency in existing technologies.

[0024] The pressurized gas is guided through the gas guide groove to a point closer to the sealing interface where the moving ring, stationary ring, and particulate media come into contact, forming an annular gas barrier. This allows for more direct and effective purging of the sealing material. The pressurized gas, with a pressure higher than that of the material, prevents solid particles or high-viscosity materials from penetrating the friction surface, fundamentally avoiding abrasive wear and extending the seal's service life.

[0025] The circumferentially symmetrically distributed air guide grooves ensure uniform flow of cooling gas across the sealing surface, preventing localized overheating. When an air passage is provided, it works in conjunction with the air guide grooves to create dynamic connectivity during shaft rotation, further enhancing gas delivery efficiency to the friction surface. This structure enables the contact-type air seal device to adapt to harsh conditions such as fluctuating operating temperatures or high equipment speeds.

[0026] When a vent is provided, it not only ensures the smooth flow of gas, but also provides a collection and storage space in case of instantaneous leakage of sealing material, reducing the aggravation of wear caused by material entering the friction sealing surface and improving the safety and reliability of the seal.

[0027] The sealing assembly of this application is connected to the rotating shaft via an elastic sealing ring seat, possessing axial and radial floating properties, which can effectively compensate for the radial runout and axial movement of the shaft. Simultaneously, the pressure exerted by the pressurized gas on the sealing ring, combined with the elastic preload of the elastic sealing ring seat, ensures a more stable seal surface, maintaining a reliable seal even during pressure fluctuations or start-stop moments.

[0028] The capping assembly of this application adopts a structure in which the front cover and the rear cover are separable. After the equipment rotation is stopped and the external air source is turned off, the fasteners can be loosened to separate the rear cover from the front cover along the axis, which facilitates the replacement of the internal sealing components without disassembling the main shaft of the equipment, thus reducing the maintenance difficulty and cost.

[0029] In summary, this application, by setting a gas guide groove on the friction sealing surface, directly introduces pressurized gas into the friction contact surface for convection cooling and material purging, effectively reducing frictional heat generation, alleviating wear on the friction pair, extending the seal service life, improving production efficiency, and reducing maintenance costs. Attached Figure Description

[0030] In the following description, embodiments of this application will be described in more detail with reference to the accompanying drawings, wherein: Figure 1 This is a cross-sectional view of the overall structure of the contact-type air-sealing device of the first embodiment of this application installed on the equipment housing, wherein the end face of the first sealing ring is provided with an air-guiding groove.

[0031] Figure 2 This is a three-dimensional structural diagram of the first sealing ring in the first embodiment of this application, used to show the air guide groove disposed on its end face.

[0032] Figure 3 This is a cross-sectional view of the overall structure of the contact-type air-sealing device according to the second embodiment of this application, installed on the equipment housing, wherein the end face of the front cover is provided with an air-guiding groove.

[0033] Figure 4This is a front view of the sealing surface of the front cover in the second embodiment of this application, used to show the air guide groove provided on the end face of the front cover.

[0034] Figure 5 This is a cross-sectional view of the overall structure of the contact-type air-sealing device according to the third embodiment of this application, installed on the equipment housing, wherein the end face of the first sealing ring is provided with an air guide groove, and the front end cover is provided with an annular air passage.

[0035] Figure 6 This is a front view of the sealing surface of the front cover in the third embodiment of this application, used to show the annular venting channel disposed in the front cover.

[0036] Figure 7 This is a three-dimensional structural schematic diagram of the first sealing ring in the third embodiment of this application, used to show the air guide groove and annular air passage on its end face.

[0037] Figure 8 This is a cross-sectional view of the overall structure of the contact-type air-sealing device according to the fourth embodiment of this application, installed on the equipment housing, wherein the end face of the first sealing ring is provided with a penetrating air-guiding groove.

[0038] Figure 9 This is a three-dimensional structural diagram of the first sealing ring in the fourth embodiment of this application, used to illustrate the penetrating air guide groove.

[0039] Other objects and features of the embodiments described herein will become apparent from the following detailed description taken in conjunction with the accompanying drawings. However, it should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of this application. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this application, it should be understood that the terms "axial", "radial", "circumferential", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0044] Figure 1 This is a cross-sectional view of the overall structure of the contact-type air-sealing device of the first embodiment of this application installed on the equipment housing, wherein the end face of the first sealing ring is provided with an air-guiding groove. Figure 2 This is a three-dimensional structural schematic diagram of the first sealing ring in the first embodiment of this application, used to show the air guide groove disposed on its end face. See also Figure 1 and Figure 2 The contact-type air seal device of this application is installed between the housing 8 of the rotating equipment and the rotating shaft 9 passing through it, and is used to seal solid powder, granular materials or high-viscosity fluid inside the equipment to prevent internal materials from leaking out and external impurities from entering.

[0045] like Figure 1 As shown, the contact-type air-sealing device mainly includes a gland assembly and a sealing assembly disposed inside it. The gland assembly includes a front cover 2 and a rear cover 1, which are axially connected by fasteners 6 and adjusting shims 15. The front cover 2 is fastened to the equipment housing 8 by connecting bolts 11 and auxiliary sealing rings 7, realizing connection, positioning, and static sealing with the equipment. After stopping the equipment rotation and shutting off the external air source, the fasteners 6 can be loosened, allowing the rear cover 1 to separate axially from the front cover 2, thereby facilitating the replacement of the internal sealing assembly.

[0046] The sealing assembly includes a first sealing ring 4, an elastic sealing ring seat 3, and a second sealing ring 5. The elastic sealing ring seat 3 is made of rubber, polyurethane, or other rubber-plastic materials, and its hardness is lower than that of the hard alloy or ceramic materials of the first sealing ring 4 and the second sealing ring 5. The first sealing ring 4, the elastic sealing ring seat 3, and the second sealing ring 5 are connected by interlocking or friction to form a whole sealing assembly, which has axial and radial floating properties. The inner hole of the elastic sealing ring seat 3 tightly fits onto the rotating shaft 9, and during normal operation, the frictional force drives the entire sealing assembly to rotate together with the rotating shaft 9.

[0047] The inner end face of the front cover 2 is positioned opposite to the end face of the first sealing ring 4 facing the material side, forming a first friction pair. The inner end face of the rear cover 1 is positioned opposite to the end face of the second sealing ring 5 facing away from the material side, forming a second friction pair.

[0048] A cylindrical space 16 is formed between the inner circumferential surface of the gland assembly, the inner end face of the front cover 2, the inner end face of the rear cover 1, and the outer circumferential surface of the sealing assembly, for containing pressurized gas.

[0049] A gas inlet 10 is provided on either the front cover 2 or the rear cover 1. The outer end of the gas inlet 10 has a threaded interface for connecting to an external gas source. A valve switching device and a pressure and flow rate adjustment and detection device can be installed between the external gas source and the gas inlet 10. Through the gas inlet 10, pressurized gas (such as nitrogen, carbon dioxide, or clean air) with a certain pressure can be injected into the cylindrical space 16. The pressure of the pressurized gas should be at least 0.5 BAR greater than the pressure of the material inside the equipment.

[0050] In the first embodiment, such as Figure 1 and Figure 2 As shown, a gas guiding groove 14 is provided on the end face of the first sealing ring 4 facing the front end cover 2. The gas guiding groove 14 extends from the radial center of the first friction pair to the outer diameter of the friction, and is symmetrically distributed circumferentially. Since the gas guiding groove 14 extends to the outer diameter of the friction, it is directly connected to the cylindrical space 16, and the pressurized gas injected by the external gas source can enter the central area of ​​the contact surface of the first friction pair without obstruction through the gas guiding groove 14.

[0051] When the equipment is running, the rotating shaft 9 drives the sealing assembly to rotate together, while the pressure cap assembly remains stationary. At the same time, an external air source injects pressurized gas into the cylindrical space 16 through the gas inlet 10. The pressurized gas fills the cylindrical space 16 and applies axial pressure to the first sealing ring 4 and the second sealing ring 5, forcing the first sealing ring 4 to press against the front end cap 2 and the second sealing ring 5 to press against the rear end cap 1, thus achieving a rotary contact seal.

[0052] Crucially, because the air guide groove 14 extends from the middle of the friction surface to its outer diameter, the pressurized gas within the cylindrical space 16 is directly guided to the contact surface of the first friction pair through the air guide groove 14. The flowing pressurized gas forms convection at the friction surface, continuously carrying away the heat generated by friction, thus achieving direct cooling of the friction pair. At the same time, the pressurized gas has a purging effect on the sealing surface, preventing material from entering the friction surface, reducing wear, and extending the service life of the seal.

[0053] Figure 3 This is a cross-sectional view of the overall structure of the contact-type air-sealing device according to the second embodiment of this application, installed on the equipment housing, wherein the end face of the front cover is provided with an air-guiding groove. Figure 4 This is a front view of the sealing surface of the front cover in the second embodiment of this application, used to show the air guide groove provided on the end face of the front cover. See also Figure 3 and Figure 4 The difference between the second embodiment and the first embodiment lies in the different positions of the air guide groove 14.

[0054] In the second embodiment, the air guide groove 14 is disposed on the end face of the front cover 2 facing the first sealing ring 4, rather than on the first sealing ring 4. Figure 4 As shown, the air guide groove 14 extends from the radial center of the end face of the front cover 2 and beyond the outer diameter edge of the first sealing ring 4 that it contacts, directly communicating with the cylindrical space 16, and is symmetrically distributed along the circumference.

[0055] The working principle of the second embodiment is the same as that of the first embodiment. The pressurized gas is guided to the contact surface of the first friction pair through the gas guide groove 14 provided on the stationary front end cover 2, thereby achieving convective cooling and material purging. Providing the gas guide groove 14 on the stationary front end cover 2 simplifies the processing technology of the rotating sealing ring.

[0056] Figure 5 This is a cross-sectional view of the overall structure of the contact-type air-sealing device according to the third embodiment of this application, installed on the equipment housing, wherein the end face of the first sealing ring is provided with an air guide groove, and the front end cover is provided with an annular air passage. Figure 6 This is a front view of the sealing surface of the front cover in the third embodiment of this application, used to show the annular venting channel disposed in the front cover. Figure 7 This is a three-dimensional structural diagram of the first sealing ring in the third embodiment of this application, used to show the air guide groove and annular venting channel on its end face. See also Figure 5 , Figure 6 and Figure 7 The third embodiment adds a ventilation duct 12 based on the first embodiment.

[0057] like Figure 5 and Figure 7 As shown, a venting groove 14 is provided on the end face of the first sealing ring 4 facing the front cover 2, and a venting channel 12 is also provided inside the ring body of the first sealing ring 4. Alternatively, as... Figure 6 As shown, the ventilation duct 12 can also be disposed within the body of the front cover 2.

[0058] One end of the vent 12 is connected to the cylindrical space 16 or directly to the gas inlet 10, and the other end opens near the contact surface of the first friction pair. The vent 12 is symmetrically distributed circumferentially. During the rotation of the rotating shaft 9, the vent 12 is at least partially connected to the gas guide groove 14 at all times, thereby further enhancing the gas delivery efficiency to the friction surface based on the gas guide groove 14.

[0059] In addition to enhancing gas flow, the vent 12 can also provide collection and storage space when materials leak instantaneously, reducing the increased wear caused by materials entering the friction sealing surface and improving the safety and reliability of the seal.

[0060] Figure 8This is a cross-sectional view of the overall structure of the contact-type air-sealing device according to the fourth embodiment of this application, installed on the equipment housing, wherein the end face of the first sealing ring is provided with a penetrating air-guiding groove. Figure 9 This is a three-dimensional structural schematic diagram of the first sealing ring in the fourth embodiment of this application, used to illustrate the through-type air guiding groove. See also Figure 8 and Figure 9 The difference between the fourth embodiment and the first embodiment lies in the depth of the air guide groove 14.

[0061] In the fourth embodiment, the air guide groove 14 provided on the end face of the first sealing ring 4 partially or completely penetrates the first friction pair along the axial direction. For example... Figure 9 As shown, the air guide groove 14 has a large depth, which allows the air guide groove 14 to penetrate the entire thickness of the friction surface.

[0062] The penetrating air guide groove 14 further increases the cross-sectional area and flow rate of gas flow, enhancing the convective cooling effect, and is especially suitable for applications with high operating temperatures or high equipment speeds.

[0063] To facilitate adjustment of the seal preload, such as Figures 1 to 8 As shown, one or more sets of adjusting shims 15 can be set between the front cover 2 and the rear cover 1. By increasing or decreasing the thickness of the shims, the total axial length of the gland assembly 20 can be finely adjusted, thereby changing the initial compression of the elastic sealing ring seat 3 and achieving the purpose of precisely adjusting the sealing preload.

[0064] To accommodate different installation and maintenance needs, the components of this contact-type air-sealing device, especially the gland assembly 20 and the sealing ring, can be designed as an integral structure, a splittable structure that is divided axially or radially, or a combination structure that is partially integral and partially split. The split points are connected by gaskets or transition pieces, facilitating installation and replacement without disassembling the main shaft of the equipment.

[0065] In summary, this application provides a gas guide groove 14 extending radially from the center to the outer diameter on the friction sealing surface, and optionally adds a vent 12, to directly introduce pressurized gas into the friction contact surface for convective cooling and material purging. This fundamentally improves the working environment of the contact seal, solves the shortcomings of insufficient cooling and severe wear in the prior art, extends the service life of the seal, and reduces production and maintenance costs.

[0066] While some specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A contact-type air-sealing device, installed between the housing (8) of a rotating device and a rotating shaft (9) passing through the housing (8), for sealing solid or high-viscosity materials inside the device, characterized in that, The contact-type gas seal device includes: A pressure cap assembly, comprising a front cap (2) and a rear cap (1), the front cap (2) and the rear cap (1) being axially connected by fasteners (6), the front cap (2) being configured to be fastened to the housing (8) by connecting bolts (11). The sealing assembly, which is disposed within the gland assembly, 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 cover (2) and the end face of the first sealing ring (4) form a first friction pair, and the inner end face of the rear cover (1) and the end face of the second sealing ring (5) form a second friction pair. A cylindrical space (16) is formed between the inner circumferential surface of the pressure cap assembly, 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 assembly. The pressure cap assembly is provided with a gas inlet (10) that communicates with the cylindrical space (16) for connecting to an external gas source to inject pressurized gas into the cylindrical space (16); At least one contact end face of the first friction pair is provided with a gas guiding groove (14). The gas guiding groove (14) extends from the radial center of the first friction pair to the outer diameter of the friction and is symmetrically distributed in the circumferential direction to guide the pressurized gas in the cylindrical space (16) to the contact surface of the first friction pair.

2. The contact-type gas sealing device according to claim 1, characterized in that, A ventilation channel (12) is provided on the end face of the first sealing ring (4) or the end face of the front cover (2). The ventilation channel (12) is configured to communicate with the air 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 according to claim 1, characterized in that, The air 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 gas sealing device according to claim 1, characterized in that, The air guide groove (14) is disposed on the end face of the front cover (2) facing the first sealing ring (4).

5. The contact-type gas sealing device according to claim 1, characterized in that, The air guide groove (14) partially or completely penetrates the first friction pair along the axial direction.

6. The contact-type gas sealing device according to claim 2, characterized in that, The ventilation duct (12) is symmetrically distributed along the circumference.

7. The contact-type gas sealing device according to claim 1, characterized in that, The pressure of the pressurized gas is at least 0.5 BAR greater than the pressure of the material inside the equipment.

8. The contact-type gas sealing device according to claim 1, characterized in that, 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-type gas sealing device according to claim 1, characterized in that, The pressurized gas is nitrogen, carbon dioxide, or air.

10. The contact-type gas sealing device according to claim 1, characterized in that, The elastic sealing ring seat (3) is made of rubber and plastic material, and its hardness is less than that of the first sealing ring (4) and the second sealing ring (5).

11. The contact-type gas sealing device according to claim 1, characterized in that, The sealing assembly is configured to float relative to the gland assembly in both the axial and radial directions.

12. The contact-type gas sealing device according to claim 1, characterized in that, 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 assembly.

13. The contact-type gas sealing device according to claim 1, characterized in that, The components of the contact-type gas sealing device are formed as an integral structure, a split structure, or a combination of both, with the split points connected by gaskets or transition pieces.

14. The contact-type gas sealing device according to claim 2, characterized in that, The cylindrical space (16) is configured to provide collection and storage space in the event of instantaneous material leakage.

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