Bidirectional gas sealing mechanism

Abstract

A two-way gas sealing mechanism relates to the field of gas sealing and comprises a sealing seat which coaxially sleeves a rotating shaft and is fixedly connected with an equipment shell, labyrinth seals are fixedly arranged on the inner side walls of the two ends of the sealing seat, and a first gap is formed between the inner side wall of each labyrinth seal and the outer side wall of the rotating shaft. A sealing space is formed between the two labyrinth seals, two blade type sealing assemblies distributed in the axial direction of the rotating shaft are symmetrically arranged in the sealing space, and the two blade type sealing assemblies divide the sealing space into a first sealing area, a flow dividing area and a second sealing area which are distributed in sequence. The blade type sealing assembly comprises a plurality of blades fixedly arranged on the outer side wall of the rotating shaft, the blades are evenly distributed in the circumferential direction of the rotating shaft, an air inlet channel allowing air to penetrate through is formed between every two adjacent blades, and a plurality of air inlet holes used for communicating the flow dividing area with the outside of the sealing seat are formed in the side wall of the sealing seat. And the service life of the sealing mechanism is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas seal, specifically a bidirectional gas seal mechanism. BACKGROUND

[0002] In the industrial production process, the shaft and the shell of various equipment need to be sealed to prevent gas leakage. The traditional sealing structure mostly adopts contact sealing, such as mechanical sealing, which includes a dynamic ring fixed on the rotating shaft and a static ring fixed on the shell. The static ring and the dynamic ring are attached to each other and relatively rotate by the pressure of the elastic mechanism and the sealing medium, and a very thin liquid film is maintained between the end faces to achieve the purpose of sealing. That is, the end faces of the dynamic ring and the static ring are always in a friction state, and the large friction force causes the end faces to have gaps due to wear, which further reduces the sealing effect and even eliminates the sealing effect, ultimately reducing the service life of the sealing mechanism. SUMMARY

[0003] To solve the problem of reducing the service life of the sealing mechanism due to wear in the prior art, the utility model provides a bidirectional gas seal mechanism, which improves the service life of the sealing mechanism.

[0004] To achieve the above-mentioned purpose, the utility model adopts the specific scheme as follows: a bidirectional gas seal mechanism, which comprises a sealing seat coaxially sleeved on a rotating shaft and fixedly connected with a device shell, a labyrinth seal is fixedly arranged on the inner side wall of both end portions of the sealing seat, and a first gap is formed between the inner side wall of the labyrinth seal and the outer side wall of the rotating shaft. Two labyrinth seals form a sealing space between them, and two leaf seal assemblies distributed along the axial direction of the rotating shaft are symmetrically arranged in the sealing space. The two leaf seal assemblies divide the sealing space into a first sealing area, a shunt area, and a second sealing area distributed in sequence. The leaf seal assembly comprises a plurality of leaves fixedly arranged on the outer side wall of the rotating shaft. The plurality of leaves are uniformly distributed in the circumferential direction of the rotating shaft, and there is an air inlet channel between adjacent two leaves for gas to pass through. During the rotation of the rotating shaft, the gas in the shunt area is sucked into the first sealing area and the second sealing area through the corresponding air inlet channel, so that the first sealing area and the second sealing area both form a high-pressure gas ring that can cover the corresponding first gap. The side wall of the sealing seat is provided with a plurality of air inlet holes for connecting the shunt area and the outside of the sealing seat.

[0005] As an optimization scheme of the above-mentioned bidirectional gas seal mechanism: the gap value of the first gap is 0.1-0.5mm.

[0006] As another optimization scheme of the above-mentioned bidirectional gas sealing mechanism: two groups of link rings corresponding to the vane sealing assemblies are arranged on the rotating shaft, and the link ring comprises an inner ring and an outer ring which are sequentially sleeved on the rotating shaft from inside to outside, and a region for accommodating the vane is formed between the inner ring and the outer ring, one end of the vane is fixedly connected with the inner ring, and the other end of the vane is fixedly connected with the outer ring.

[0007] As another optimization scheme of the above-mentioned bidirectional gas sealing mechanism: a second gap is formed between the outer side wall of the outer ring and the inner side wall of the sealing seat.

[0008] As another optimization scheme of the above-mentioned bidirectional gas sealing mechanism: the gap value of the second gap is 0.15-0.5mm.

[0009] As another optimization scheme of the above-mentioned bidirectional gas sealing mechanism: the vane is arranged to be inclined, and the included angle formed between the vane and the center line of the rotating shaft is 45-90°.

[0010] As another optimization scheme of the above-mentioned bidirectional gas sealing mechanism: a guide ring fixedly sleeved on the rotating shaft is arranged in the shunt region, and the guide ring divides the shunt region into a first region in communication with the first sealing region and a second region in communication with the second sealing region.

[0011] As another optimization scheme of the above-mentioned bidirectional gas sealing mechanism: an annular groove for communicating the gas inlet hole and the shunt region is arranged on the inner side wall of the sealing seat, and the edge of the guide ring extends into the annular groove.

[0012] As another optimization scheme of the above-mentioned bidirectional gas sealing mechanism: the thickness of the guide ring gradually decreases along the radial direction thereof.

[0013] As another optimization scheme of the above-mentioned bidirectional gas sealing mechanism: a plurality of mounting holes for mounting the sealing seat on the equipment shell are arranged on the sealing seat.

[0014] Compared with the prior art, the bidirectional gas sealing mechanism has the following beneficial effects:

[0015] 1. The bidirectional gas sealing mechanism is provided, two vane sealing assemblies are symmetrically arranged, the rotation directions of the vanes in the two vane sealing assemblies are opposite, the rotating shaft drives the vanes to rotate in the rotating process, the gas in the shunt region is respectively sucked into the first sealing region and the second sealing region, the high-pressure gas rings are formed in the first sealing region and the second sealing region, the media on both sides of the labyrinth seal are separated by the high-pressure gas rings, and the sealing effect is achieved; the sealing mechanism is not worn, the service life of the sealing mechanism is prolonged, meanwhile, the bidirectional sealing of two different media is realized, and the sealing effect is improved.

[0016] 2. The utility model discloses, the gas that enters the sealing seat through the air inlet hole is divided into two parts under the action of the flow guide ring, and enters the first sealing area and the second sealing area respectively. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure schematic diagram of the utility model;

[0018] Figure 2 It is the structure schematic diagram of the blade seal assembly and the link ring;

[0019] Reference signs: 1, rotation shaft, 2, sealing seat, 201, air inlet hole, 202, labyrinth seal, 203, first gap, 3, blade seal assembly, 301, inner ring, 302, blade, 303, outer ring, 304, air inlet channel, 4, first sealing area, 5, shunt area, 6, second sealing area, 7, flow guide ring, 701, mounting ring. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be further described in detail below in combination with specific embodiments, and the parts not described and disclosed in the following embodiments of the utility model should be understood as the prior art known or should be known by the person skilled in the art, such as the structure of the labyrinth seal 202 and how the labyrinth seal 202 is installed on the sealing seat 2.

[0021] Embodiment 1

[0022] A bidirectional gas sealing mechanism, comprising a sealing seat 2 coaxially sleeved on a rotating shaft 1 and fixedly connected with a device shell, in the embodiment, the sealing seat 2 is of an upper-lower split structure, facilitating installation of the sealing seat 2; the inner diameter of the sealing seat 2 is greater than the diameter of the rotating shaft 1, the sealing seat 2 is coaxially sleeved on the rotating shaft 1, and an annular space is formed between the inner side wall of the sealing seat 2 and the outer side wall of the rotating shaft 1. A connecting ring is fixedly arranged around the outer side wall of the end portion of the sealing seat 2, the outer diameter of the two connecting rings is greater than the outer diameter of the sealing seat 2, the inner diameter of the two connecting rings is equal to the outer diameter of the sealing seat 2, and the inner side wall of the two connecting rings is integrally connected with the outer side wall of the sealing seat 2. The connecting mode of the sealing seat 2 and the device shell is bolt connection, that is, a plurality of mounting holes for bolt penetration are formed on the connecting ring and uniformly distributed along the circumferential direction of the connecting ring, and the axis of the mounting hole is parallel to the axis of the connecting ring.

[0023] The labyrinth seal 202 is fixedly arranged on the inner side wall of the two end portions of the sealing seat 2, and the inner side wall of the labyrinth seal 202 and the outer side wall of the rotating shaft 1 have a first gap 203, such as Figure 1As shown, the labyrinth seal 202 is a zigzag-shaped labyrinth seal 202 formed by a set of sealing teeth to form a series of regular first gaps 203 and expansion cavities. In this embodiment, the gap between the sealing teeth and the outer side wall of the rotating shaft 1 is the first gap 203. When the gas in the device flows through the first gap 203, the gas flow is throttled once, the pressure and temperature of the gas flow decrease, and the flow rate increases. After passing through a first gap 203, the gas flow enters the expansion cavity formed by the adjacent two sealing teeth. The gas flow enters the expansion cavity, the speed of the gas flow decreases and forms a vortex flow. The gas flow alternately enters the first gap 203 and the expansion cavity, so that the gas flow alternately receives throttling and expansion, and the flow rate and pressure drop of the gas become larger and larger. When the pressure drops to approximately the back pressure, the gas no longer continues to flow out, and the sealing of the gas is realized.

[0024] In this embodiment, the gap value of the first gap 203 is 0.1-0.5mm.

[0025] The two labyrinth seals 202 form a sealing space, and two leaf seal assemblies 3 are symmetrically arranged in the sealing space along the axial direction of the rotating shaft 1. The two leaf seal assemblies 3 divide the sealing space into a first sealing area 4, a flow dividing area 5 and a second sealing area 6 arranged in sequence. Figure 1 As shown, specifically, the space between the left labyrinth seal 202 and the left leaf seal assembly 3 is the first sealing area 4, the space between the two leaf seal assemblies 3 is the flow dividing area 5, and the space between the right leaf seal assembly 302 and the right labyrinth seal 202 is the second sealing area 6.

[0026] As shown in Figure 2As shown, the vane sealing assembly 3 comprises a plurality of vanes 302 fixedly arranged on the outer sidewall of the rotating shaft 1, the vanes 302 are arranged obliquely, and the included angle between the vanes 302 and the center line of the rotating shaft 1 is 45-90°, the plurality of vanes 302 are uniformly distributed along the circumference of the rotating shaft 1, and there is a gas inlet passage 304 between adjacent two vanes 302 for gas to pass through. The vanes 302 and the rotating shaft 1 are arranged in a manner that two groups of adapter rings corresponding to the vane sealing assembly 3 are arranged on the rotating shaft 1, the adapter rings comprise an inner ring 301 and an outer ring 303 which are sequentially sleeved on the rotating shaft 1 from inside to outside, a region for accommodating the vanes 302 is formed between the inner ring 301 and the outer ring 303, one end of the vane 302 is fixedly connected with the inner ring 301, and the other end of the vane 302 is fixedly connected with the outer ring 303. In the embodiment, the inner ring 301 and the outer ring 303 are coaxially arranged, the inner diameter of the inner ring 301 is equal to the diameter of the rotating shaft 1, and the inner ring 301 is fixedly connected with the rotating shaft 1; the outer diameter of the outer ring 303 is slightly smaller than the inner diameter of the sealing seat 2, so that a second gap is formed between the outer sidewall of the outer ring 303 and the inner sidewall of the sealing seat 2 to prevent backflow of high-pressure gas, and the gap value of the second gap is 0.15-0.5mm. The vane 302 is located between the inner ring 301 and the outer ring 303, and the connection mode of one end of the vane 302 with the inner ring 301 is welding, and the connection mode of the other end of the vane 302 with the outer ring 303 is welding.

[0027] During the rotation of the vanes 302 with the rotating shaft 1, the gas in the shunt area 5 is sucked into the first sealing area 4 and the second sealing area 6 through the corresponding gas inlet passage 304, so that a high-pressure gas ring covering the corresponding first gap 203 is formed in the first sealing area 4 and the second sealing area 6; a plurality of gas inlet holes 201 are formed in the sidewall of the sealing seat 2 for communicating the shunt area 5 with the outside of the sealing seat 2, and the gas in the shunt area 5 can be pressure gas generated by itself. The rotating shaft 1 drives the vanes 302 to rotate during rotation, and the gas in the shunt area 5 enters the first sealing area 4 and the second sealing area 6, respectively, so that a negative pressure is formed in the shunt area 5, and the gas pressure is less than the pressure outside the sealing seat 2; the gas outside the sealing seat 2 enters the shunt area 5 through the gas inlet hole 201; after the gas in the shunt area 5 enters the first sealing area 4 and the second sealing area 6, a high-pressure gas ring is formed in the first sealing area 4 and the second sealing area 6, so that the medium in the equipment is separated by the high-pressure gas ring, and the sealing effect is achieved. The sealing mechanism has no wear, prolonging the service life of the sealing mechanism, and realizing bidirectional sealing of two different media and improving the sealing effect.

[0028] The above is the basic implementation manner of the utility model, which can be further improved, optimized and limited on the basis to obtain the following embodiments:

[0029] Embodiment 2

[0030] The embodiment is an improved scheme of the bidirectional gas sealing mechanism on the basis of embodiment 1, the main body structure of which is the same as that of embodiment 1, and the improvement lies in that a flow guide ring 7 fixedly arranged on the rotating shaft 1 is arranged in the shunt area 5, the flow guide ring 7 is located at the center position of the shunt area 5, the flow guide ring 7 is fixedly connected with the rotating shaft 1 through a mounting ring 701, the inner diameter of the mounting ring 701 is equal to the diameter of the rotating shaft 1, and the inner side wall of the mounting ring 701 is fixedly connected with the inner side wall of the rotating shaft 1; the outer diameter of the mounting ring 701 is equal to the outer diameter of the inner ring 301, and the two end faces of the mounting ring 701 are in contact with the end faces of the two inner rings 301 respectively. The inner diameter of the flow guide ring 7 is equal to the outer diameter of the mounting ring 701, the flow guide ring 7 is integrally connected with the mounting ring 701, the thickness of the mounting ring 701 is less than the thickness of the flow guide ring 7, and the thickness of the flow guide ring 7 gradually decreases along the radial direction thereof. The flow guide ring 7 divides the shunt area 5 into a first area in communication with the first sealing area 4 and a second area in communication with the second sealing area 6. The sealing seat 2 is provided with an annular groove on the inner side wall of the shunt area 5 for communicating the gas inlet hole 201 with the shunt area 5, the edge of the flow guide ring 7 extends into the annular groove, and the gas entering the sealing seat 2 through the gas inlet hole 201 is divided into two parts under the action of the flow guide ring 7 and enters the first area and the second area respectively, the blades 302 rotate to make the gas in the first area and the second area enter the first sealing area 4 and the second sealing area 6 correspondingly, and form a high-pressure gas ring.

[0031] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bidirectional gas sealing mechanism, comprising a sealing seat (2) coaxially sleeved on a rotating shaft (1) and fixedly connected to a device housing, wherein a labyrinth seal (202) is fixedly provided on the inner sidewalls of both ends of the sealing seat (2), and a first gap (203) exists between the inner sidewall of the labyrinth seal (202) and the outer sidewall of the rotating shaft (1), characterized in that: A sealed space is formed between the two labyrinth seals (202). Two blade-type sealing assemblies (3) are symmetrically arranged within the sealed space, distributed axially along the rotation axis (1). The two blade-type sealing assemblies (3) divide the sealed space into a first sealing area (4), a diversion area (5), and a second sealing area (6) distributed sequentially. Each blade-type sealing assembly (3) includes multiple blades (302) fixedly mounted on the outer wall of the rotation axis (1). The multiple blades (302) are evenly distributed circumferentially along the rotation axis (1), and adjacent blades... (302) has an air intake channel (304) for gas to pass through. During the rotation of the blade (302) with the rotating shaft (1), the gas in the diversion zone (5) is drawn into the first sealing zone (4) and the second sealing zone (6) through the corresponding air intake channel (304), so that the first sealing zone (4) and the second sealing zone (6) form a high-pressure gas ring that can cover the corresponding first gap (203). The side wall of the sealing seat (2) is provided with several air intake holes (201) for connecting the diversion zone (5) and the outside of the sealing seat (2).

2. The bidirectional gas sealing mechanism as described in claim 1, characterized in that: The gap value of the first gap (203) is 0.1-0.5mm.

3. The bidirectional gas sealing mechanism as described in claim 1, characterized in that: The rotating shaft (1) is provided with two sets of connecting rings that correspond one-to-one with the blade-type sealing assembly (3). The connecting ring includes an inner ring (301) and an outer ring (303) that are sequentially sleeved on the rotating shaft (1) from the inside to the outside. An area for accommodating the blade (302) is formed between the inner ring (301) and the outer ring (303). One end of the blade (302) is fixedly connected to the inner ring (301), and the other end of the blade (302) is fixedly connected to the outer ring (303).

4. The bidirectional gas sealing mechanism as described in claim 3, characterized in that: There is a second gap between the outer wall of the outer ring (303) and the inner wall of the sealing seat (2).

5. The bidirectional gas sealing mechanism as described in claim 4, characterized in that: The gap value of the second gap is 0.15-0.5mm.

6. The bidirectional gas sealing mechanism as described in claim 1, characterized in that: The blade (302) is inclined, and the angle formed between the blade (302) and the center line of the rotating shaft (1) is 45-90°.

7. The bidirectional gas sealing mechanism as described in claim 1, characterized in that: The diversion zone (5) is provided with a guide ring (7) fixedly sleeved on the rotating shaft (1). The guide ring (7) divides the diversion zone (5) into a first region that communicates with the first sealing zone (4) and a second region that communicates with the second sealing zone (6).

8. A bidirectional gas sealing mechanism as described in claim 7, characterized in that: The sealing seat (2) has an annular groove on the inner wall of the diversion area (5) for connecting the air inlet (201) and the diversion area (5), and the edge of the guide ring (7) extends into the annular groove.

9. A bidirectional gas sealing mechanism as described in claim 7, characterized in that: The thickness of the guide ring (7) gradually decreases along its radial direction.

10. A bidirectional gas sealing mechanism as described in claim 1, characterized in that: The sealing seat (2) has multiple mounting holes for mounting it on the equipment housing.

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