Large-expansion-difference self-adaptive dry gas sealing structure for energy storage compressor

Abstract

The large-expansion-difference self-adaptive dry gas sealing structure comprises a shaft sleeve, a pair of movable rings, a fixed shell and a pair of static rings, the shaft sleeve is fixedly arranged outside a rotating shaft of the energy storage compressor in a sleeving mode, and the middle of the side wall of the shaft sleeve is arranged in a protruding mode in the radial direction to form a rotating disc; the movable rings coaxially sleeve the shaft sleeve, are clamped on the two surfaces of the rotary disc and are fixedly connected with the rotary disc; the shaft sleeve is coaxially sleeved with the fixed shell, and the fixed shell is fixedly connected with a machine shell of the energy storage compressor. The static rings are coaxially arranged outside the shaft sleeve in a sleeving mode and located on the two faces of the rotary disc respectively, the static rings correspond to the movable rings one to one, and the static rings are elastically connected with the fixed shell in the axial direction so that the static rings can make contact with the corresponding movable ring faces; and the air cavity is communicated with the interior of the fixed shell, and the air cavity can generate an air film between the fixed ring and the corresponding movable ring. The problems that an existing energy storage compressor cannot effectively deal with frequent starting and stopping and the large expansion difference of a unit rotor can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy storage compressor, specifically relates to a big expansion difference self -adaptation dry gas seal structure for energy storage compressor. BACKGROUND

[0002] Solar energy, wind energy and other renewable energy sources develop rapidly, but they have certain randomness and instability, which causes certain impact on the power grid. Energy storage, as an important solution to the mismatch between energy supply and demand, is the key support for building a new power system, and with the increase of the proportion of renewable energy, long-time energy storage has become a trend in future development. Compressed air and compressed carbon dioxide energy storage, as a kind of long-time energy storage, have the advantages of large energy storage capacity, high safety, long service life, economy and environmental protection, and become the only energy storage technology comparable to pumped storage.

[0003] Dry gas seal is originally used to solve the shaft end sealing problem of high-speed centrifugal compressor. Because of the non-contact operation of the seal, the sealing ring material of the seal is basically not limited by PV value, and it is particularly suitable for shaft end sealing of high-speed high-pressure equipment, and it is widely used in the field of turbine machinery. Due to the working condition characteristics, the centrifugal compressor in the energy storage industry starts and stops almost every day, and the temperature fluctuates greatly, which needs to withstand large temperature difference. Because of the temperature, there is a large expansion difference of the unit rotor. At present, the conventional dry gas seal can withstand the expansion difference of the unit rotor within ±3mm, which cannot adapt to the working condition of the centrifugal compressor in the energy storage industry. Moreover, the conventional dry gas seal has stable running condition and small process fluctuation, and it can be stopped for maintenance after three years of normal stable operation. The centrifugal compressor in the energy storage industry starts and stops almost every day, and the process fluctuation is large, so the conventional dry gas seal cannot be used. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a big expansion difference self-adaptive dry gas seal structure for energy storage compressor, which can solve the problem that the existing energy storage compressor cannot effectively cope with frequent start-stop and large expansion difference of unit rotor.

[0005] The utility model realizes the following technical scheme:

[0006] A large expansion differential adaptive dry gas sealing structure for an energy storage compressor includes a bushing fixedly fitted onto the rotating shaft of the energy storage compressor, with a radially protruding disk formed on the middle of the side wall of the bushing; a pair of rotating rings coaxially fitted onto the bushing and sandwiched between the two sides of the disk, and fixedly connected to the disk; a fixed shell coaxially fitted onto the bushing and fixedly connected to the housing of the energy storage compressor; a pair of stationary rings coaxially fitted onto the bushing and located on the two sides of the disk, with each stationary ring corresponding to one of the rotating rings, and the stationary rings elastically connected to the fixed shell axially so that the stationary rings contact the corresponding rotating ring surfaces; and a gas chamber communicating with the interior of the fixed shell, the gas chamber being able to generate a gas film between the stationary rings and the corresponding rotating rings.

[0007] Optionally, the outer edge of the rotating disk extends axially to both ends to form two retaining rings, the inner diameter of which matches the outer diameter of the moving ring, and the thickness of the retaining ring is less than the thickness of the moving ring.

[0008] Optionally, the side of the moving ring that contacts the corresponding stationary ring has multiple air grooves, and one end of each air groove extends outward through the outer wall of the moving ring.

[0009] Optionally, all of the air grooves are evenly distributed in a ring shape around the axis of the moving ring.

[0010] Optionally, the air groove is arc-shaped and the inner end is wedge-shaped; the width of the outer end of the air groove is greater than the width of the inner end.

[0011] Optionally, the bushing includes a fixed sleeve and a pair of pressure sleeves; the fixed sleeve is cylindrical and coaxially fixedly fitted onto the outside of the rotating shaft of the energy storage compressor, and the rotating disk is located in the middle of the fixed sleeve; the pressure sleeve is cylindrical, the inner diameter of the pressure sleeve matches the inner diameter of the fixed sleeve, the outer diameter of the pressure sleeve is larger than the outer diameter of the fixed sleeve, one end of the pressure sleeve has a slot coaxially formed, the diameter of the slot matches the outer diameter of the fixed sleeve; the two pressure sleeves are respectively inserted into the two ends of the fixed sleeve through the slot, the end face of the fixed sleeve abuts against the bottom of the slot, and the side of the rotating ring away from the rotating disk abuts against and presses against the end face of the pressure sleeve.

[0012] Optionally, the fixed housing is slidably connected with a pair of push rings along the axial direction. The push rings are connected to the fixed housing by springs, and the springs are arranged along the axial direction of the bushing. The two stationary rings are respectively disposed on the two push rings. When the springs are in their natural state, the stationary rings abut against the corresponding moving rings.

[0013] Optionally, the push ring includes a slide cylinder and a push plate; the inner diameter of the slide cylinder is slightly larger than the outer diameter of the pressure sleeve and is fitted onto the corresponding pressure sleeve, and the outer wall of the slide cylinder is slidably connected to the fixed shell; the push plate is coaxially fitted onto the inner end of the push ring, the outer diameter of the push plate is slightly larger than the outer diameter of the moving ring, and the spring is clamped between the push plate and the inner wall of the fixed shell.

[0014] Optionally, the fixed shell includes a top half-shell and a bottom half-shell; the two push rings are respectively installed on the top half-shell and the bottom half-shell; the inner walls of the top half-shell and the bottom half-shell are respectively provided with spring grooves along the axial direction, and the diameter of the spring groove matches the outer diameter of the spring.

[0015] Optionally, the air cavity is arranged in a ring shape and is coaxially sandwiched between the top half shell and the bottom half shell.

[0016] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0017] This utility model provides a large expansion difference adaptive dry gas sealing structure for an energy storage compressor. A bushing is fixedly fitted to the rotating shaft of the energy storage compressor, and a rotating disk protrudes from the bushing. A rotating ring is positioned on each side of the rotating disk, allowing the rotating ring to rotate with the compressor shaft. A fixed shell is fixedly connected to the compressor housing, and a pair of stationary rings are placed inside the fixed shell, elastically connecting them to the rotating rings. A gas chamber is provided, communicating with the interior of the fixed shell, through which sealing gas is injected. This sealing gas forms a gas film between the rotating and stationary rings, allowing the stationary rings to overcome their elasticity and form a non-contact relationship. This design effectively avoids friction and wear between the rotating and stationary rings caused by frequent start-stop cycles, thus extending service life. When the ambient temperature fluctuates significantly, the unit rotor experiences a large expansion difference. The bushing moves axially along with the compressor shaft, causing the rotating ring to move synchronously. At this time, because the stationary ring is elastically connected to the fixed shell, it moves synchronously along the axial direction with the rotating ring, maintaining a sealed, non-contact operating state, thus effectively adapting to the large expansion difference condition. Through the cooperation of the above features, this large expansion difference adaptive dry gas sealing structure for energy storage compressors can effectively solve the problem that existing energy storage compressors cannot effectively cope with frequent start-stop cycles and large rotor expansion differences. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0019] Figure 1A partial half-sectional schematic diagram of a large expansion difference adaptive dry gas sealing structure for an energy storage compressor provided in an embodiment of this utility model;

[0020] Figure 2 A schematic diagram of the moving ring of the large expansion difference adaptive dry gas sealing structure for an energy storage compressor provided in an embodiment of this utility model.

[0021] The attached diagram shows the markings and corresponding component names:

[0022] 1-Shaft of energy storage compressor; 2-Casing of energy storage compressor; 10-Shaft sleeve; 11-Rotating disc; 111-Retaining ring; 12-Fixed sleeve; 13-Pressure sleeve; 131-Slot; 20-Moving ring; 21-Air groove; 30-Fixed shell; 301-Top half shell; 302-Bottom half shell; 303-Spring groove; 31-Push ring; 311-Slide cylinder; 312-Push plate; 32-Spring; 40-Stationary ring; 50-Air chamber. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0024] Example

[0025] Please refer to Figure 1 and Figure 2 This embodiment provides a large expansion difference adaptive dry gas sealing structure for an energy storage compressor, including a bushing 10, which is fixedly fitted onto the rotating shaft 1 of the energy storage compressor. A rotating disk 11 is radially protruding from the center of the side wall of the bushing 10. The second part includes a pair of moving rings 20, which are coaxially fitted onto the bushing 10 and sandwiched between the two sides of the rotating disk 11, and are fixedly connected to the rotating disk 11. The third part includes a fixed shell 30, which is coaxially fitted onto the bushing 10 and connected to the energy storage compressor. The housing 2 is fixedly connected; the fourth includes a pair of stationary rings 40, which are coaxially fitted outside the bushing 10 and located on both sides of the rotating disk 11. The stationary rings 40 correspond one-to-one with the rotating rings 20. The stationary rings 40 are elastically connected to the fixed housing 30 along the axial direction so that the stationary rings 40 are in contact with the corresponding rotating rings 20; the fifth includes an air cavity 50, which is connected to the interior of the fixed housing 30. The air cavity 50 can generate an air film between the stationary rings 40 and the corresponding rotating rings 20.

[0026] The large expansion difference adaptive dry gas sealing structure for an energy storage compressor provided in this embodiment uses a bushing 10 to be fixedly fitted to the rotating shaft 1 of the energy storage compressor. A rotating disk 11 protrudes from the bushing 10, and a rotating ring 20 is provided on each side of the rotating disk 11, so that the rotating ring 20 can rotate together with the rotating shaft 1 of the energy storage compressor. On this basis, a fixed shell 30 is provided to be fixedly connected to the housing 2 of the energy storage compressor, and a pair of stationary rings 40 are provided inside the fixed shell 30, so that the stationary rings 40 are elastically connected to the fixed shell 30 and abut against the rotating rings 20. A gas chamber 50 is provided to communicate with the interior of the fixed shell 30, and sealing gas is injected into the fixed shell 30 through the gas chamber 50. The sealing gas can form a gas film between the rotating rings 20 and the stationary rings 40, so that the stationary rings 40 overcome the elasticity. The stationary ring 40 forms a non-contact state with the rotating ring 20, thereby effectively avoiding frictional wear between the rotating ring 20 and the stationary ring 40 caused by frequent start-stop cycles, effectively extending the service life. When the on-site temperature fluctuates greatly, the unit rotor generates a large expansion difference. The bushing 10 moves axially along with the compressor shaft, thereby driving the rotating ring 20 to move synchronously. At this time, since the stationary ring 40 is elastically connected to the fixed shell 30, the stationary ring 40 will move synchronously along the axial direction with the rotating ring 20, maintaining a sealed non-contact operating state, thus effectively adapting to the large expansion difference condition. Through the cooperation of the above features, the large expansion difference adaptive dry gas sealing structure for energy storage compressors can effectively solve the problem that existing energy storage compressors cannot effectively cope with frequent start-stop cycles and large expansion differences of the unit rotor.

[0027] In order to provide radial limiting and structural support for the rotating ring 20 to overcome the centrifugal force during rotation, the outer edge of the rotating disk 11 extends axially to both ends to form two retaining rings 111. The inner diameter of the retaining rings 111 matches the outer diameter of the rotating ring 20, and the thickness of the retaining rings 111 is less than the thickness of the rotating ring 20.

[0028] In order to enable the sealing gas to better form an air film between the moving ring 20 and the stationary ring 40, the side of the moving ring 20 that contacts the corresponding stationary ring 40 has multiple air grooves 21, one end of which extends outward through the outer wall of the moving ring 20.

[0029] With the above configuration, the sealing gas enters the gas groove 21 from the outer port of the gas groove 21, flows from the outside to the inside along the gas groove, and is then pressed into the space between the moving ring 20 and the stationary ring 40 to form a gas film.

[0030] In order to maintain the stability of the air film, all the air grooves 21 are evenly distributed in a ring around the axis of the moving ring 20.

[0031] To facilitate the entry of sealing gas into the gas groove 21 and the formation of an air film, the gas groove 21 is arc-shaped and its inner end is wedge-shaped; the width of the outer end of the gas groove 21 is greater than the width of the inner end.

[0032] It should be noted that the bending direction of the air groove 21 is opposite to the rotation direction of the moving ring 20, so that the outer end of the air groove 21 is in a catching state.

[0033] To further explain the specific structure of the bushing 10, the bushing 10 includes a fixed sleeve 12 and a pair of pressure sleeves 13; the fixed sleeve 12 is cylindrical and coaxially fixedly fitted onto the outside of the rotating shaft 1 of the energy storage compressor, and the rotating disk 11 is located in the middle of the fixed sleeve 12; the pressure sleeve 13 is cylindrical, the inner diameter of the pressure sleeve 13 matches the inner diameter of the fixed sleeve 12, the outer diameter of the pressure sleeve 13 is larger than the outer diameter of the fixed sleeve 12, and one end of the pressure sleeve 13 has a slot 131 coaxially formed, the diameter of the slot 131 matches the outer diameter of the fixed sleeve 12; the two pressure sleeves 13 are respectively inserted into the two ends of the fixed sleeve 12 through the slots 131, the end face of the fixed sleeve 12 abuts against the bottom of the slot 131, and the side of the rotating ring 20 away from the rotating disk 11 abuts against and presses against the end face of the pressure sleeve 13.

[0034] With the above settings, the pressure sleeve 13 is used to axially fix both ends of the fixed sleeve 12. At the same time, the pressure sleeve 13 is used to axially press the moving ring 20, so that the moving ring 20 and the rotating disk 11 are pressed and sealed, and the pressure between the moving ring 20 and the rotating disk 11 is increased, so as to increase the friction between the two.

[0035] To further explain the elastic connection structure between the stationary ring 40 and the fixed shell 30, the fixed shell 30 is slidably connected to a pair of push rings 31 along the axial direction. The push rings 31 are connected to the fixed shell 30 by springs 32, which are arranged along the axial direction of the bushing 10. The two stationary rings 40 are respectively disposed on the two push rings 31. When the springs 32 are in their natural state, the stationary rings 40 abut against the corresponding moving rings 20.

[0036] With the above configuration, the sliding connection between the push ring 31 and the fixed shell 30, supplemented by the elasticity of the spring 32, is used to achieve an elastic connection between the push ring 31 and the fixed shell 30, and the sliding direction is axial. Then, the stationary ring 40 is fixedly connected to the push ring 31 to achieve an elastic connection between the stationary ring 40 and the push ring 31.

[0037] It should be noted that the spring 32 is always in a compressed state to ensure that the axial displacement of the moving ring 20 can be accommodated when there is a large expansion difference.

[0038] To further explain the specific structure of the push ring 31, the push ring 31 includes a slide cylinder 311 and a push plate 312; the inner diameter of the slide cylinder 311 is slightly larger than the outer diameter of the pressure sleeve 13, and it is fitted onto the corresponding pressure sleeve 13. The outer wall of the slide cylinder 311 is slidably connected to the fixed shell 30; the push plate 312 is coaxially fitted onto the inner end of the push ring 31, and the outer diameter of the push plate 312 is slightly larger than the outer diameter of the moving ring 20. The spring 32 is clamped between the push plate 312 and the inner wall of the fixed shell 30.

[0039] With the above configuration, the slide 311 is responsible for axial sliding, while the push plate 312 increases the extrusion radius and improves the matching degree with the outer diameter of the stationary ring 40. The push plate 312 can effectively provide an installation environment for the spring 32 so that the spring 32 is stably set between the push plate 312 and the fixed shell 30.

[0040] To further explain the specific structure of the fixed shell 30, the fixed shell 30 includes a top half shell 301 and a bottom half shell 302; the two push rings 31 are respectively installed on the top half shell 301 and the bottom half shell 302; the inner walls of the top half shell 301 and the bottom half shell 302 are respectively provided with spring grooves 303 along the axial direction, and the diameter of the spring grooves 303 matches the outer diameter of the spring 32.

[0041] In order to allow the sealing gas to enter the gas groove 21 evenly to form a gas film, the gas cavity 50 is arranged in a ring shape and is coaxially sandwiched between the top half shell 301 and the bottom half shell 302.

[0042] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A large expansion difference adaptive dry gas sealing structure for an energy storage compressor, characterized in that, include: A bushing (10) is fixedly fitted onto the outside of the rotating shaft (1) of the energy storage compressor. A rotating disk (11) is formed by radially protruding from the middle of the side wall of the bushing (10). A pair of moving rings (20) are coaxially fitted outside the bushing (10) and sandwiched between the two sides of the rotating disk (11), and are fixedly connected to the rotating disk (11); Fixed housing (30), the fixed housing (30) is coaxially fitted outside the bushing (10) and fixedly connected to the housing (2) of the energy storage compressor; A pair of stationary rings (40) are coaxially fitted outside the bushing (10) and located on both sides of the rotating disk (11). The stationary rings (40) correspond one-to-one with the moving rings (20). The stationary rings (40) are elastically connected to the fixed shell (30) along the axial direction so that the stationary rings (40) contact the corresponding moving ring (20) surfaces. The air cavity (50) is connected to the interior of the fixed shell (30) and the air cavity (50) is capable of generating an air film between the stationary ring (40) and the corresponding moving ring (20).

2. The large expansion difference adaptive dry gas sealing structure for an energy storage compressor according to claim 1, characterized in that, The outer edge of the rotating disk (11) extends axially to both ends to form two retaining rings (111). The inner diameter of the retaining ring (111) matches the outer diameter of the moving ring (20), and the thickness of the retaining ring (111) is less than the thickness of the moving ring (20).

3. The large expansion difference adaptive dry gas sealing structure for energy storage compressors according to claim 2, characterized in that, The moving ring (20) has multiple air grooves (21) on the side that contacts the corresponding stationary ring (40), and one end of the air groove (21) extends outward through the outer wall of the moving ring (20).

4. The large expansion difference adaptive dry gas sealing structure for an energy storage compressor according to claim 3, characterized in that, All of the air grooves (21) are evenly distributed in a ring shape around the axis of the moving ring (20).

5. The large expansion difference adaptive dry gas sealing structure for an energy storage compressor according to claim 4, characterized in that, The air groove (21) is arc-shaped and its inner end is wedge-shaped; The width of the outer end of the air groove (21) is greater than the width of the inner end.

6. The large expansion difference adaptive dry gas sealing structure for an energy storage compressor according to claim 1, characterized in that, The bushing (10) includes a fixed sleeve (12) and a pair of pressure sleeves (13); The fixed sleeve (12) is cylindrical and is coaxially fixedly fitted outside the rotating shaft (1) of the energy storage compressor. The rotating disk (11) is located in the middle of the fixed sleeve (12). The pressure sleeve (13) is cylindrical, and the inner diameter of the pressure sleeve (13) matches the inner diameter of the fixed sleeve (12). The outer diameter of the pressure sleeve (13) is larger than the outer diameter of the fixed sleeve (12). One end of the pressure sleeve (13) has a slot (131) coaxially formed, and the diameter of the slot (131) matches the outer diameter of the fixed sleeve (12). The two pressure sleeves (13) are respectively inserted into the two ends of the fixed sleeve (12) through the slot (131). The end face of the fixed sleeve (12) abuts against the bottom of the slot (131). The side of the moving ring (20) away from the rotating disk (11) abuts against and presses against the end face of the pressure sleeve (13).

7. The large expansion difference adaptive dry gas sealing structure for an energy storage compressor according to claim 6, characterized in that, The fixed shell (30) is slidably connected to a pair of push rings (31) along the axial direction. The push rings (31) are connected to the fixed shell (30) by springs (32), and the springs (32) are arranged along the axial direction of the bushing (10). The two stationary rings (40) are respectively disposed on the two push rings (31). When the spring (32) is in its natural state, the stationary ring (40) abuts against the corresponding moving ring (20).

8. The large expansion difference adaptive dry gas sealing structure for an energy storage compressor according to claim 7, characterized in that, The push ring (31) includes a slide cylinder (311) and a push plate (312); The inner diameter of the slide cylinder (311) is slightly larger than the outer diameter of the pressure sleeve (13), and it is fitted onto the corresponding pressure sleeve (13). The outer wall of the slide cylinder (311) is slidably connected to the fixed shell (30). The push plate (312) is coaxially fitted onto the inner end of the push ring (31). The outer diameter of the push plate (312) is slightly larger than the outer diameter of the moving ring (20). The spring (32) is sandwiched between the push plate (312) and the inner wall of the fixed shell (30).

9. The large expansion difference adaptive dry gas sealing structure for an energy storage compressor according to claim 8, characterized in that, The fixed shell (30) includes a top half-shell (301) and a bottom half-shell (302); The two push rings (31) are respectively installed on the top half shell (301) and the bottom half shell (302); The inner walls of the top half-shell (301) and the bottom half-shell (302) are respectively provided with spring grooves (303) along the axial direction, and the diameter of the spring grooves (303) matches the outer diameter of the spring (32).

10. The large expansion difference adaptive dry gas sealing structure for an energy storage compressor according to claim 9, characterized in that, The air cavity (50) is arranged in a ring shape and is coaxially sandwiched between the top half shell (301) and the bottom half shell (302).

Images