Combined dry gas seal

Abstract

The utility model relates to the technical field of combined dry gas seals, and discloses a combined dry gas seal which comprises a combined dry gas seal shell, and a buffer tank is arranged on one side of the combined dry gas seal shell. And the dry gas sealing buffer assemblies are arranged inside and on the outer side of the combined dry gas sealing shell. A first dry gas sealing ring and a spiral groove are arranged to form non-contact sealing through the gas film effect, dynamic compensation is provided in cooperation with a first spring in a spring box, mechanical vibration and thermal deformation are effectively dealt with, the stability of a gap of a sealing face is maintained, and the leakage risk is reduced; the gas flowing path is optimized by blocking the inclined holes, real-time adjustment of the pressure of the sealing gas film is achieved, process gas pressure fluctuation is adapted, meanwhile, the movable ring shell and the rotating shaft lantern ring facilitate quick disassembly and replacement of the sealing assembly, and the effect of improving the sealing reliability is achieved.

Description

Technical Field

[0001] This utility model relates to the field of combined dry gas seal technology, specifically to combined dry gas seals. Background Technology

[0002] Dry gas sealing is an advanced shaft end sealing technology that uses non-contact gas lubrication. It is widely used in high-speed, high-pressure rotating equipment, especially in industries such as petrochemicals, natural gas processing, and aerospace. Traditional dry gas sealing technology mainly relies on a single sealing structure (such as a single-layer spiral groove dry gas sealing ring) to form a non-contact seal through the gas dynamic pressure effect.

[0003] Under high-speed rotation, the thickness of the gas film is easily affected by fluctuations in process gas pressure, temperature changes, and mechanical vibration, leading to contact failure of the sealing surface and causing leakage or wear. Simultaneously, the lack of an effective gas buffering system makes it impossible to adjust the sealing gas film pressure in real time, hindering its adaptation to complex operating conditions (such as start-up, shutdown, and variable operating conditions). Process gas leaks can pollute the environment and even cause safety accidents (such as leaks of flammable and explosive gases). Therefore, a combined dry gas seal needs to be designed. Utility Model Content

[0004] The purpose of this invention is to provide a combined dry gas seal, which solves the technical problem that traditional seals, when rotating at high speeds, are prone to process gas leakage due to unstable gas film or wear of sealing surface, which pollutes the environment and reduces equipment efficiency. This achieves the goal of effective sealing and preventing process gas leakage.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a combined dry gas seal, comprising a combined dry gas seal housing, wherein a buffer tank is provided on one side of the combined dry gas seal housing; a dry gas seal buffer assembly, wherein the dry gas seal buffer assembly is disposed inside and outside the combined dry gas seal housing; the dry gas seal buffer assembly includes: a sealing part, wherein the sealing part is disposed inside the combined dry gas seal housing; and a dry gas buffer part, wherein the dry gas buffer part is disposed inside and outside the combined dry gas seal housing, and the dry gas buffer part is disposed at the rear end and outer side of the sealing part.

[0006] Preferably, the sealing part includes: a rotating ring housing, which is contained inside the combined dry gas sealing housing; a rotating shaft collar is provided at one end of the rotating ring housing, a first dry gas sealing ring is provided inside the rotating ring housing, and the outer circumference of the first dry gas sealing ring is provided with spiral grooves at equal intervals, and a spring box is provided on one side of the first dry gas sealing ring.

[0007] Preferably, a first spring is installed equidistantly on the inner circumference of the spring box, and a dynamic ring sealing ring is provided on the outer side of the spring box. A blocking oblique hole is provided above the dynamic ring sealing ring, and the blocking oblique hole extends to the top of the dynamic ring shell.

[0008] Preferably, the dry gas buffer portion includes: a combined rotating ring housing, the combined rotating ring housing being disposed on the outer wall of the rotating ring housing via an outer sealing ring; a booster, the booster being fixedly installed on the top of the buffer tank; a connecting rotating sleeve being disposed inside the combined rotating ring housing, a second dry gas sealing ring being disposed inside the connecting rotating sleeve, and spiral grooves being equidistantly opened on the outer circumference of the outer wall of the second dry gas sealing ring; a spring seat being fixedly installed on the outer wall of the second dry gas sealing ring, a spring groove being opened on one side of the spring seat, a spring being fixedly installed inside the spring groove, and the other end of the spring being fixedly connected to the outer wall of the spring seat.

[0009] Preferably, a stationary ring is provided on one end face of the combined moving ring housing. A slot is provided inside the stationary ring, and a fixing ring is provided inside the slot by snap-fit. The fixing ring has teeth that are evenly and uniformly fixed inside. A stationary sealing ring is provided inside the stationary ring, and a nitrogen channel is provided below the teeth.

[0010] Preferably, the top of the stationary ring is provided with a nitrogen inlet, which extends into the interior of the nitrogen channel. A dispersion hole is provided on one side of the nitrogen inlet, and the dispersion hole is located on the top of the combined moving ring shell. A vent hole is provided on one side of the dispersion hole, and the vent hole is located on the top of the combined moving ring shell. Sealing gaskets are provided on the top of the nitrogen inlet, the dispersion hole, and the vent hole.

[0011] Preferably, a branch pipe hole is provided on the other side of the nitrogen inlet, a buffer gas connection pipe is provided at the top of the booster, a control valve is sleeved on the outer wall of the buffer gas connection pipe, and an anti-overflow gasket is fixedly installed on the outer wall of the buffer gas connection pipe, with the anti-overflow gasket located on the top of the stationary ring.

[0012] This utility model provides a combined dry gas seal. It has the following beneficial effects:

[0013] (1) This utility model forms a non-contact seal through the gas film effect by setting a first dry gas sealing ring and a spiral groove. The first spring in the spring box provides dynamic compensation, effectively copes with mechanical vibration and thermal deformation, maintains the stability of the sealing surface gap, and reduces the risk of leakage. The spring box and the rotating ring seal work together to optimize the gas flow path by blocking the oblique hole, realize the real-time adjustment of the sealing gas film pressure, and adapt to the fluctuation of process gas pressure. At the same time, the rotating ring shell and the rotating shaft collar facilitate quick disassembly and replacement of sealing components, reduce maintenance costs and downtime, extend the overall life of the equipment, and achieve the effect of improving sealing reliability.

[0014] (2) This utility model forms a double-layer sealing structure by setting a second dry gas sealing ring and a first dry gas sealing ring. Through the dynamic compensation mechanism of spiral groove and spring, it provides redundant protection and significantly reduces the risk of single seal failure. With the help of the booster, the pressure of the buffer tank is adjusted in real time through the buffer gas connection pipe and the control valve. With the help of the nitrogen channel and branch pipe hole, the pressure of the sealing gas film is precisely controlled, which can adapt to pressure fluctuations under complex working conditions. At the same time, the vent hole and the dispersion hole work together to effectively discharge excess gas and prevent system overpressure. The sealing gasket and the anti-overflow gasket ensure the sealing of the gas flow path and avoid process gas leakage and environmental pollution, thereby improving the safety of the system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the combined dry gas seal structure of this utility model;

[0017] Figure 3 This is an exploded view of the combined dry gas sealing shell of this utility model;

[0018] Figure 4 This is an exploded view of the interior of the combined dry gas seal of this utility model.

[0019] In the diagram: 1 Combined dry gas sealing shell, 2 Buffer tank, 3 Dry gas sealing buffer assembly, 31 Sealing part, 311 Dynamic ring shell, 312 Rotary shaft collar, 313 First dry gas sealing ring, 314 Spring box, 315 First spring, 316 Dynamic ring sealing retaining ring, 317 Blocking oblique hole, 32 Dry gas buffer part, 321 Combined dynamic ring shell, 322 Connecting rotating sleeve, 323 Second dry gas sealing ring, 324 Spring groove, 325 Spring, 326 Stationary ring, 327 Clamping tooth, 328 Stationary sealing ring, 329 Nitrogen channel, 3210 Nitrogen inlet, 3211 Dispersion hole one, 3212 Vent hole, 3213 Sealing gasket, 3214 Branch pipe hole, 3215 Intensifier, 3216 Buffer gas connecting pipe, 3217 Control valve, 3218 Anti-overflow gasket. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Example

[0022] Based on the existing problems of traditional seals, which are prone to process gas leakage at high speeds due to unstable gas film or wear of sealing surfaces, resulting in environmental pollution and reduced equipment efficiency, the preferred embodiment of the combined dry gas seal provided by this utility model is as follows: Figure 1-4 As shown: A combined dry gas seal includes a combined dry gas seal housing 1, with a buffer tank 2 disposed on one side of the combined dry gas seal housing 1; and a dry gas seal buffer assembly 3 disposed inside and outside the combined dry gas seal housing 1; the dry gas seal buffer assembly 3 includes: a sealing part 31 disposed inside the combined dry gas seal housing 1; and a dry gas buffer part 32 disposed inside and outside the combined dry gas seal housing 1, with the dry gas buffer part 32 disposed at the rear end and outer side of the sealing part 31.

[0023] The sealing part 31 includes: a rotating ring housing 311, which is contained inside the combined dry gas sealing housing 1; a rotating shaft collar 312 is provided at one end of the rotating ring housing 311, a first dry gas sealing ring 313 is provided inside the rotating ring housing 311, and spiral grooves are equidistantly opened on the outer circumference of the first dry gas sealing ring 313, and a spring box 314 is provided on one side of the first dry gas sealing ring 313.

[0024] The spring box 314 has a first spring 315 installed at equal intervals around its inner circumference. The spring box 314 has a rotating ring sealing ring 316 on its outer side. A blocking oblique hole 317 is provided above the rotating ring sealing ring 316 and extends to the top of the rotating ring housing 311.

[0025] Furthermore, this embodiment features a first dry gas sealing ring 313 and a spiral groove that forms a non-contact seal through the gas film effect. This, combined with the first spring 315 within the spring box 314 providing dynamic compensation, effectively addresses mechanical vibration and thermal deformation, maintains stable sealing surface gaps, and reduces leakage risks. The spring box 314 works in conjunction with the rotating ring sealing retainer 316, optimizing the gas flow path through the oblique hole 317, enabling real-time adjustment of the sealing gas film pressure to adapt to fluctuations in process gas pressure. Simultaneously, the rotating ring housing 311 and the rotating shaft collar 312 facilitate quick disassembly and replacement of the sealing components, reducing maintenance costs and downtime, and extending the overall lifespan of the equipment. Example

[0026] Please see Figures 1-4 Furthermore, based on Embodiment 1, the following is obtained: the dry gas buffer section 32 includes: a combined dynamic ring housing 321, which is disposed on the outer wall of the dynamic ring housing 311 via an outer sealing ring; a booster 3215, which is fixedly installed on the top of the buffer tank 2; a connecting sleeve 322 is provided inside the combined dynamic ring housing 321, a second dry gas sealing ring 323 is provided inside the connecting sleeve 322, and the outer wall of the second dry gas sealing ring 323 is provided with spiral grooves at equal intervals around its circumference; a spring seat is fixedly installed on the outer wall of the second dry gas sealing ring 323, a spring groove 324 is provided on one side of the spring seat, a spring 325 is fixedly installed inside the spring groove 324, and the other end of the spring 325 is fixedly connected to the outer wall of the spring seat.

[0027] One end face of the combined dynamic ring housing 321 is provided with a stationary ring 326. The stationary ring 326 has a slot inside, and a fixing ring is provided inside the slot by snap-fit. The fixing ring has teeth 327 evenly and uniformly fixed inside. The stationary ring 326 has a stationary sealing ring 328 inside. A nitrogen channel 329 is provided below the teeth 327.

[0028] The top of the stationary ring 326 is provided with a nitrogen inlet 3210, which extends into the interior of the nitrogen channel 329. A dispersion hole 3211 is provided on one side of the nitrogen inlet 3210, and the dispersion hole 3211 is located on the top of the combined moving ring housing 321. A vent hole 3212 is provided on one side of the dispersion hole 3211, and the vent hole 3212 is located on the top of the combined moving ring housing 321. A sealing gasket 3213 is provided on the top of the nitrogen inlet 3210, the dispersion hole 3211, and the vent hole 3212.

[0029] A branch pipe hole 3214 is provided on the other side of the nitrogen inlet 3210. A buffer gas connection pipe 3216 is provided at the top of the booster 3215. A control valve 3217 is sleeved on the outer wall of the buffer gas connection pipe 3216. An anti-overflow gasket 3218 is fixedly installed on the outer wall of the buffer gas connection pipe 3216, and the anti-overflow gasket 3218 is located on the top of the stationary ring 326.

[0030] Furthermore, this embodiment establishes a double-layer sealing structure by setting a second dry gas sealing ring 323 and a first dry gas sealing ring 313. Through the dynamic compensation mechanism of the spiral groove and spring 325, redundant protection is provided, significantly reducing the risk of single seal failure. In conjunction with the booster 3215, the pressure of the buffer tank 2 is adjusted in real time through the buffer gas connection pipe 3216 and the control valve 3217. With the nitrogen channel 329 and the branch pipe hole 3214, precise control of the sealing gas film pressure is achieved, adapting to pressure fluctuations under complex working conditions. At the same time, the vent hole 3212 and the dispersion hole 3211 work together to effectively discharge excess gas and prevent system overpressure. The sealing gasket 3213 and the anti-overflow gasket 3218 ensure the sealing of the gas flow path and prevent process gas leakage from polluting the environment.

[0031] In use, the rotating ring housing 311 is connected to the rotating shaft via the rotating shaft collar 312 and rotates synchronously with the shaft. The spiral groove on the outer wall of the first dry gas sealing ring 313 introduces a buffer gas, such as nitrogen, into the sealing gap during rotation, forming a stable gas film and isolating process gases. The first spring 315 inside the spring box 314 provides preload force, ensuring a tight fit between the sealing ring and the stationary ring 326 and maintaining the gas film thickness. The rotating ring sealing retainer 316 prevents axial gas leakage, and the oblique hole 317 guides excess gas to the top of the rotating ring housing 311 for discharge.

[0032] Furthermore, the combined rotating ring housing 321 encloses the rotating ring housing 311, and the second dry gas sealing ring 323 inside further stabilizes the gas film and enhances the sealing effect through a spiral groove. The spring 325 in the spring groove 324 provides continuous preload to accommodate mechanical vibration and thermal deformation. The stationary ring 326 is fixed to the retaining ring and the retaining teeth 327, and the internal nitrogen channel 329 connects to the nitrogen inlet 3210 to deliver buffer gas to the sealing gap.

[0033] The buffer tank 2 stores buffer gas, and the booster 3215 regulates the gas pressure through the buffer gas connection pipe 3216 and the control valve 3217 to ensure the stability of the sealing gas film.

[0034] Furthermore, nitrogen inlet 3210 introduces buffer gas, and branch pipe hole 3214 provides a backup gas channel, enhancing system reliability. Diffuser hole 3211 evenly distributes gas, and vent hole 3212 discharges excess gas to prevent system overpressure. Sealing gasket 3213 prevents gas leakage, and anti-overflow gasket 3218 ensures the seal between buffer gas connection pipe 3216 and stationary ring 326.

[0035] Furthermore, the double-layer seal works in tandem. The first dry gas sealing ring 313 and the second dry gas sealing ring 323 form a double seal, and the spiral groove design allows the gas to form a stable gas film during rotation, isolating the process gas. The buffer tank 2 and the booster 3215 work together, adjusting the gas pressure in real time through the control valve 3217 to adapt to fluctuations in process gas pressure. The spring box 314, spring groove 324, first spring 315, and spring 325 provide continuous preload force to ensure a tight fit between the sealing ring and the stationary ring 326, adapting to mechanical vibration and thermal deformation. The vent hole 3212 promptly releases excess gas to prevent system overpressure and ensure the stability of the sealing gas film. The combined moving ring housing 321 and the moving ring housing 311 are connected by an outer sealing ring, facilitating disassembly and maintenance and reducing maintenance costs.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A combined dry gas seal, comprising a combined dry gas seal housing (1), characterized in that: A buffer tank (2) is provided on one side of the combined dry gas sealed housing (1). Dry gas seal buffer assembly (3), which is disposed inside and outside the combined dry gas seal housing (1); The dry gas sealing buffer assembly (3) includes: A sealing part (31) is disposed inside the combined dry gas sealing shell (1); Dry gas buffer part (32) is disposed inside and outside the combined dry gas sealing shell (1), and dry gas buffer part (32) is disposed at the rear end and outside of the sealing part (31).

2. The combined dry gas seal according to claim 1, characterized in that: The sealing portion (31) includes: The rotating ring housing (311) is contained within the combined dry gas seal housing (1); One end of the moving ring housing (311) is provided with a rotating shaft collar (312), and the inside of the moving ring housing (311) is provided with a first dry gas sealing ring (313). The outer wall of the first dry gas sealing ring (313) is provided with spiral grooves at equal intervals, and a spring box (314) is provided on one side of the first dry gas sealing ring (313).

3. The combined dry gas seal according to claim 2, characterized in that: The spring box (314) has a first spring (315) installed at equal intervals around its inner circumference. The spring box (314) has a moving ring sealing ring (316) on its outer side. The moving ring sealing ring (316) has a blocking oblique hole (317) above it, and the blocking oblique hole (317) extends to the top of the moving ring outer shell (311).

4. The combined dry gas seal according to claim 1, characterized in that: The dry gas buffer section (32) includes: A combined dynamic ring housing (321) is provided on the outer wall of the dynamic ring housing (311) by means of an outer ring sealing ring; A booster (3215) is fixedly mounted on top of the buffer tank (2); The combined rotating ring housing (321) is provided with a connecting sleeve (322) inside. The connecting sleeve (322) is provided with a second dry gas sealing ring (323) inside. The outer wall of the second dry gas sealing ring (323) is provided with spiral grooves at equal intervals. A spring seat is fixedly installed on the outer wall of the second dry gas sealing ring (323). A spring groove (324) is provided on one side of the spring seat. A spring (325) is fixedly installed inside the spring groove (324), and the other end of the spring (325) is fixedly connected to the outer wall of the spring seat.

5. The combined dry gas seal according to claim 4, characterized in that: One end face of the combined dynamic ring housing (321) is provided with a stationary ring (326). The stationary ring (326) has a slot inside, and a fixing ring is provided inside the slot by snap-fit. The fixing ring has teeth (327) evenly and uniformly fixed inside. The stationary ring (326) has a stationary sealing ring (328) inside. A nitrogen channel (329) is provided below the teeth (327).

6. The combined dry gas seal according to claim 5, characterized in that: The top of the stationary ring (326) is provided with a nitrogen inlet (3210), and the nitrogen inlet (3210) extends into the interior of the nitrogen channel (329). A dispersion hole (3211) is provided on one side of the nitrogen inlet (3210), and the dispersion hole (3211) is located on the top of the combined moving ring shell (321). A vent hole (3212) is provided on one side of the dispersion hole (3211), and the vent hole (3212) is located on the top of the combined moving ring shell (321). A sealing gasket (3213) is provided on the top of the nitrogen inlet (3210), the dispersion hole (3211), and the vent hole (3212).

7. The combined dry gas seal according to claim 6, characterized in that: A branch pipe hole (3214) is provided on the other side of the nitrogen inlet (3210). A buffer gas connection pipe (3216) is provided at the top of the booster (3215). A control valve (3217) is sleeved on the outer wall of the buffer gas connection pipe (3216). An anti-overflow gasket (3218) is fixedly installed on the outer wall of the buffer gas connection pipe (3216), and the anti-overflow gasket (3218) is located on the top of the stationary ring (326).

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