Single-stage centrifugal blower with air pressure buffering backflow structure
Patent Information
- Application Number
- CN202522047803.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-23
- Publication Date
- 2026-09-04
- Estimated Expiration
- 2035-09-23
AI Technical Summary
[0004]本实用新型针对以上技术问题，提供一种带有气压缓冲回流结构的单级离心鼓风机，通过该气压缓冲回流结构能够对进入叶轮后盘与其后面相邻的外壳体端面之间间隙内的气体进行泄压，避免缝隙内的气体对叶轮造成轴向冲击，同时，能够避免由于缝隙内的气体压力过大，导致该气体通过主轴与迷宫密封套之间的缝隙向外泄漏的问题
[0018]The beneficial effect of this utility model is that, by fixing a primary pressure relief buffer plate and a secondary pressure relief buffer plate to the outer end of the impeller rear plate, and having multiple primary and secondary pressure relief buffer plates, the primary pressure relief buffer plates are located at the outer circumference of the outer end of the impeller rear plate and are evenly distributed along the circumference. Similarly, the secondary pressure relief buffer plates are located at the inner circumference of the outer end of the impeller rear plate and are also evenly distributed along the circumference. By setting multiple primary and secondary pressure relief buffer plates, the gas, during its entry into the airflow chamber, will first come into contact with the primary pressure relief buffer plates, which will then perform an initial collision and pressure relief on the incoming gas. After depressurization, the gas continues to flow into the airflow chamber, where it comes into contact with multiple secondary pressure relief buffers again. These buffers collide with the incoming gas again, causing further pressure relief. After these two collisions, the gas pressure is significantly reduced, resulting in a relatively stable airflow that does not cause axial impact on the impeller and rotating shaft. Furthermore, the gas pressure inside the airflow chamber is close to the external ambient pressure, with a very small pressure difference. This prevents the gas inside the airflow chamber from leaking out through the gap between the main shaft and the labyrinth seal sleeve. Finally, under the centrifugal force of the impeller's rotation, the depressurized gas is discharged radially along the airflow chamber and continues to be transported normally along with the gas discharged from the impeller outlet.
Smart Images
Figure CN224717903U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a centrifugal blower, and more particularly to a single-stage centrifugal blower with a pressure buffer reflux structure. Background Technology
[0002] Centrifugal blowers are devices that rely on the centrifugal force of impeller rotation to accelerate gas and convert it into pressure energy. They are widely used in gas transportation, industrial ventilation and other fields.
[0003] After the centrifugal blower is assembled, there is a gap between the impeller rear plate and the end face of the adjacent outer casing. When the blower is running, a small portion of the gas will enter the gap when the gas is discharged from the impeller outlet. At this time, due to the high gas pressure in the gap, it will cause axial impact on the impeller. At the same time, because the gas pressure in the gap is greater than the pressure of the external environment, the gas in the gap will also leak out through the gap between the main shaft and the labyrinth seal sleeve. Utility Model Content
[0004] This utility model addresses the above-mentioned technical problems by providing a single-stage centrifugal blower with a pneumatic buffer reflux structure. This pneumatic buffer reflux structure can release the pressure of the gas entering the gap between the impeller rear disc and the adjacent outer casing end face, preventing the gas in the gap from causing axial impact on the impeller. At the same time, it can prevent the gas from leaking outward through the gap between the main shaft and the labyrinth seal sleeve due to excessive gas pressure in the gap.
[0005] Therefore, the technical solution of this utility model is a single-stage centrifugal blower with a pneumatic buffer reflux structure, which is provided with an outer shell, a sealing assembly and a transmission assembly. The outer shell is composed of a front shell, a middle shell and a rear shell. The two ends of the middle shell are fixedly connected to the front shell and the rear shell respectively. The center positions of the front shell and the rear shell are respectively provided with through holes.
[0006] The sealing assembly includes an air inlet sealing ring, a labyrinth sealing sleeve, and a rotary sealing ring. The air inlet sealing ring is located inside the through hole on the front housing. The outer side of the air inlet sealing ring is fixedly connected to the outer side of the through hole on the front housing. The outer circumference of the air inlet sealing ring and the inner circumference of the through hole seal each other.
[0007] The transmission assembly includes an impeller, a main shaft, and a rotating shaft disk. The impeller includes a front impeller disk and a rear impeller disk. The front impeller disk and the rear impeller disk are respectively provided with through holes at their center positions. The through holes on the front impeller disk are sealed and fixed to each other with a rotating sealing ring. The inner circumference of the rotating sealing ring and the inner outer circumference of the air inlet sealing ring rotate and seal each other.
[0008] The main shaft is located inside the through hole on the rear housing. The front section of the main shaft is located inside the through hole on the impeller rear plate. The rear section of the main shaft is located on the axial outer side of the housing. The rotating shaft disk is located between the front section of the main shaft and the through hole on the impeller rear plate. The outer circumference of the rotating shaft disk and the inner circumference of the through hole are sealed and fixed to each other. The inner circumference of the rotating shaft disk and the outer circumference of the front section of the main shaft are sealed and fixed to each other. A labyrinth seal sleeve is provided on the outer circumference of the main shaft located on the axial outer side of the housing. The labyrinth seal sleeve is also fixedly connected to the rear housing. The labyrinth seal sleeve and the main shaft rotate and seal each other.
[0009] After the main shaft, rotating shaft disk, and impeller rear disk are fixedly connected, an airflow cavity is formed between the main shaft, rotating shaft disk, impeller rear disk, and rear end housing;
[0010] The outer end of the impeller rear disc is fixedly provided with a primary pressure relief buffer plate and a secondary pressure relief buffer plate. There are multiple primary pressure relief buffer plates and multiple secondary pressure relief buffer plates. The multiple primary pressure relief buffer plates are located at the outer circumference of the outer end of the impeller rear disc and are evenly distributed along the circumference. The multiple secondary pressure relief buffer plates are located at the inner circumference of the outer end of the impeller rear disc and are evenly distributed along the circumference.
[0011] A pressure relief return channel with a narrow inner diameter and a wide outer diameter is provided between two adjacent primary pressure relief buffer plates and between two adjacent secondary pressure relief buffer plates.
[0012] Preferably, multiple primary pressure relief buffer plates and secondary pressure relief buffer plates are arranged radially symmetrically along the circumferential direction.
[0013] Preferably, the multiple primary pressure relief buffer plates and secondary pressure relief buffer plates are staggered with each other along the circumferential direction.
[0014] Preferably, there are eight primary pressure relief buffers and eight secondary pressure relief buffers.
[0015] Preferably, both the primary pressure relief buffer and the secondary pressure relief buffer are sheet-like structures;
[0016] The length of the first-stage pressure relief buffer plate is 15%-20% of the impeller rear disc diameter, the height of the first-stage pressure relief buffer plate is 15mm-20mm, and the thickness of the first-stage pressure relief buffer plate is 8%-10% of the impeller rear disc diameter.
[0017] The length ratio of the secondary pressure relief buffer to the primary pressure relief buffer is 1:2. The height of the secondary pressure relief buffer is 15mm-20mm, and the thickness of the secondary pressure relief buffer is 8%-10% of the impeller rear disc diameter.
[0018] The beneficial effect of this utility model is that, by fixing a primary pressure relief buffer plate and a secondary pressure relief buffer plate to the outer end of the impeller rear plate, and having multiple primary and secondary pressure relief buffer plates, the primary pressure relief buffer plates are located at the outer circumference of the outer end of the impeller rear plate and are evenly distributed along the circumference. Similarly, the secondary pressure relief buffer plates are located at the inner circumference of the outer end of the impeller rear plate and are also evenly distributed along the circumference. By setting multiple primary and secondary pressure relief buffer plates, the gas, during its entry into the airflow chamber, will first come into contact with the primary pressure relief buffer plates, which will then perform an initial collision and pressure relief on the incoming gas. After depressurization, the gas continues to flow into the airflow chamber, where it comes into contact with multiple secondary pressure relief buffers again. These buffers collide with the incoming gas again, causing further pressure relief. After these two collisions, the gas pressure is significantly reduced, resulting in a relatively stable airflow that does not cause axial impact on the impeller and rotating shaft. Furthermore, the gas pressure inside the airflow chamber is close to the external ambient pressure, with a very small pressure difference. This prevents the gas inside the airflow chamber from leaking out through the gap between the main shaft and the labyrinth seal sleeve. Finally, under the centrifugal force of the impeller's rotation, the depressurized gas is discharged radially along the airflow chamber and continues to be transported normally along with the gas discharged from the impeller outlet. Attached Figure Description
[0019] Figure 1 This is a cross-sectional view of the structure of this utility model;
[0020] Figure 2 This is a schematic diagram of the impeller rear disc structure in this utility model;
[0021] Figure 3 This is a schematic diagram of another structure of the impeller rear disc in this utility model;
[0022] Figure 4 This is a utility model Figure 1 Enlarged view of point A in the middle.
[0023] Explanation of symbols in the diagram:
[0024] 1. Outer shell; 101. Front shell; 102. Middle shell; 103. Rear shell; 2. Inlet sealing ring; 3. Impeller; 301. Impeller front plate; 302. Impeller rear plate; 303. Impeller inlet; 304. Impeller outlet; 4. First-stage pressure relief buffer plate; 5. Second-stage pressure relief buffer plate; 6. Main shaft; 7. Labyrinth seal sleeve; 8. Airflow chamber; 9. Rotating shaft disc; 10. Rotating sealing ring; 11. Pressure relief return channel; 12. Outlet. Detailed Implementation
[0025] The present invention will be further described below with reference to the embodiments.
[0026] pass Figures 1-4 As can be seen, the single-stage centrifugal blower with air pressure buffer reflux structure is provided with an outer shell 1, a sealing assembly and a transmission assembly. The outer shell 1 is composed of a front shell 101, a middle shell 102 and a rear shell 103. The two ends of the middle shell 102 are fixedly connected to the front shell 101 and the rear shell 103 respectively. The center positions of the front shell 101 and the rear shell 103 are respectively provided with through holes.
[0027] The sealing assembly includes an air inlet sealing ring 2, a labyrinth sealing sleeve 7, and a rotary sealing ring 10. The air inlet sealing ring 2 is located inside the through hole on the front housing 101. The outer side of the air inlet sealing ring 2 is fixedly connected to the outer side of the through hole on the front housing 101. The outer circumference of the air inlet sealing ring 2 and the inner circumference of the through hole seal each other.
[0028] The transmission assembly includes an impeller 3, a main shaft 6, and a rotating shaft disk 9. The impeller 3 includes an impeller front disk 301 and an impeller rear disk 302. The impeller front disk 301 and the impeller rear disk 302 are respectively provided with through holes at their center positions. The through holes on the impeller front disk 301 are sealed and fixed to each other with the rotating sealing ring 10. The inner circumference of the rotating sealing ring 10 is rotated and sealed to each other with the inner outer circumference of the air inlet sealing ring 2.
[0029] The main shaft 6 is located inside the through hole on the rear housing 103. The front section of the main shaft 6 is located inside the through hole on the impeller rear plate 302. The rear section of the main shaft 6 is located on the axial outer side of the outer housing 1. The rotating shaft disk 9 is located between the front section of the main shaft 6 and the through hole on the impeller rear plate 302. The outer circumference of the rotating shaft disk 9 and the inner circumference of the through hole are sealed and fixed to each other. The inner circumference of the rotating shaft disk 9 and the outer circumference of the front section of the main shaft 6 are sealed and fixed to each other. A labyrinth seal sleeve 7 is provided on the outer circumference of the main shaft 6 located on the axial outer side of the outer housing 1. The labyrinth seal sleeve 7 is also fixedly connected to the rear housing 103. The labyrinth seal sleeve 7 and the main shaft 6 rotate and seal each other.
[0030] After the main shaft 6, rotating shaft disk 9, and impeller rear disk 302 are fixedly connected, an airflow cavity 8 is formed between the main shaft 6, rotating shaft disk 9, impeller rear disk 302, and rear end housing 103. When the blower is running, the gas enters the interior of the impeller 3 through the inlet sealing ring 2 and the impeller inlet 303 in sequence. Under the centrifugal force of the rotating impeller 3, the gas pressure increases significantly. The pressurized gas is discharged from the impeller outlet 304 through the airflow channel inside the impeller 3. After the gas is discharged through the impeller outlet 304, most of the gas will be discharged normally from the outlet 12, completing the normal pressurization transmission of the gas. However, a small portion of the gas will enter the airflow cavity 8. Due to the high pressure of this gas, the high-pressure gas inside the airflow cavity 8 will cause axial impact on the impeller 3 and rotating shaft disk 9. Furthermore, due to the high pressure of the gas, the gas will leak outward through the gap between the main shaft 6 and the labyrinth seal sleeve 7. This invention is designed to solve these two technical problems.
[0031] A primary pressure relief buffer plate 4 and a secondary pressure relief buffer plate 5 are fixedly provided on the outer end of the impeller rear disc 302. There are multiple primary pressure relief buffer plates 4 and multiple secondary pressure relief buffer plates 5. The multiple primary pressure relief buffer plates 4 are located on the outer circumference of the outer end of the impeller rear disc 302 and are evenly distributed along the circumference. The multiple secondary pressure relief buffer plates 5 are located on the inner circumference of the outer end of the impeller rear disc 302 and are evenly distributed along the circumference. By setting multiple primary pressure relief buffer plates 4 and multiple secondary pressure relief buffer plates 5, the gas, when entering the airflow chamber 8, will first come into contact with multiple primary pressure relief buffer plates 4. The multiple primary pressure relief buffer plates 4 will perform an initial collision and pressure relief on the incoming gas. The pressure-relieved gas... As the gas continues to flow into the airflow chamber 8, it will again come into contact with multiple secondary pressure relief buffers 5. These buffers 5 will then collide with and depressurize the incoming gas again. After these two collisions, the gas pressure is significantly reduced, and the airflow becomes relatively stable, preventing axial impact on the impeller 3 and the rotating shaft disk 9. Furthermore, the gas pressure inside the airflow chamber 8 is close to the external ambient gas pressure, with a very small pressure difference. This prevents the gas inside the airflow chamber 8 from leaking out through the gap between the main shaft 6 and the labyrinth seal sleeve 7. Finally, under the centrifugal force of the impeller 3, the depressurized gas will be discharged radially along the airflow chamber 8 again, and then transported normally with the gas discharged from the impeller outlet 304.
[0032] Between two adjacent primary pressure relief buffer plates 4 and between two adjacent secondary pressure relief buffer plates 5, pressure relief return channels 11 with narrow inner sides and wide outer sides are respectively provided, forming multiple fan-shaped pressure relief return channels 11. By setting the pressure relief return channels 11 to fan shape, the speed of airflow entering the airflow cavity 8 can be slowed down. While slowing down the speed, the airflow can be depressurized by multiple collisions, reducing the gas pressure. Furthermore, when the gas in the airflow cavity 8 is discharged radially, the fan-shaped pressure relief return channels 11 with narrow inner sides and wide outer sides can allow the gas to be discharged quickly, avoiding the phenomenon of gas vortex in the airflow cavity 8, thereby reducing the amplitude of vibration during blower operation and reducing operating noise.
[0033] In one specific embodiment, multiple primary pressure relief buffer plates 4 and secondary pressure relief buffer plates 5 are arranged radially symmetrically along the circumference. Under the action of the radially symmetrical fan-shaped pressure relief return channel 11, the gas inside the airflow chamber 8 can be quickly discharged, further reducing the amplitude of vibration during blower operation and reducing operating noise.
[0034] In one specific embodiment, the multiple primary pressure relief buffers 4 and secondary pressure relief buffers 5 can be arranged to be staggered in the circumferential direction. This allows the gas inside the airflow cavity 8 to collide in a staggered manner, which can increase the pressure relief effect on the gas and further prevent the gas from leaking outward through the gap between the main shaft and the labyrinth seal sleeve due to excessive gas pressure inside the airflow cavity 8.
[0035] In one specific embodiment, there are eight primary pressure relief buffers 4 and eight secondary pressure relief buffers 5, which can ensure the stability of the impeller 3 structure and prevent rotational shaking, while also ensuring sufficient pressure relief for the gas inside the airflow chamber 8.
[0036] In a specific embodiment, both the primary pressure relief buffer 4 and the secondary pressure relief buffer 5 are sheet-like structures. The length of the primary pressure relief buffer 4 is 15%-20% of the diameter of the impeller rear disc 302, the height of the primary pressure relief buffer 4 is 15mm-20mm, and the thickness of the primary pressure relief buffer 4 is 8%-10% of the diameter of the impeller rear disc 302. The length ratio of the secondary pressure relief buffer 5 to the primary pressure relief buffer 4 is 1:2, the height of the secondary pressure relief buffer 5 is 15mm-20mm, and the thickness of the secondary pressure relief buffer 5 is 8%-10% of the diameter of the impeller rear disc 302. This combination of parameters is the optimal combination, which can ensure the stability of the impeller 3 rotation, reduce the vibration amplitude of the impeller 3 during rotation, avoid friction between the impeller 3 and the rear housing 103, ensure the smooth operation of the blower, reduce operating noise, and ensure the pressure relief effect of the primary pressure relief buffer 4 and the secondary pressure relief buffer 5 on the gas inside the airflow cavity 8, thereby minimizing the pressure of the gas inside the airflow cavity 8.
[0037] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.
Claims
1. A single-stage centrifugal blower with a pneumatic buffer reflux structure, characterized in that: It is provided with an outer shell, a sealing assembly and a transmission assembly. The outer shell is composed of a front shell, a middle shell and a rear shell. The two ends of the middle shell are fixedly connected to the front shell and the rear shell respectively. The center positions of the front shell and the rear shell are respectively provided with through holes. The sealing assembly includes an air inlet sealing ring, a labyrinth sealing sleeve, and a rotary sealing ring. The air inlet sealing ring is located inside the through hole on the front end housing. The outer side of the air inlet sealing ring is fixedly connected to the outer side of the through hole on the front end housing. The outer circumference of the air inlet sealing ring and the inner circumference of the through hole seal each other. The transmission assembly includes an impeller, a main shaft, and a rotating shaft disk. The impeller includes a front impeller disk and a rear impeller disk. The front impeller disk and the rear impeller disk are respectively provided with through holes at their center positions. The through holes on the front impeller disk are sealed and fixed to each other with a rotating sealing ring. The inner circumference of the rotating sealing ring and the inner outer circumference of the air inlet sealing ring rotate and seal each other. The main shaft is located inside the through hole on the rear housing. The front section of the main shaft is located inside the through hole on the impeller rear plate. The rear section of the main shaft is located on the axial outer side of the housing. The rotating shaft disk is located between the front section of the main shaft and the through hole on the impeller rear plate. The outer circumference of the rotating shaft disk and the inner circumference of the through hole are mutually sealed and fixed. The inner circumference of the rotating shaft disk and the outer circumference of the front section of the main shaft are mutually sealed and fixed. A labyrinth sealing sleeve is provided on the outer circumference of the main shaft located on the axial outer side of the housing. The labyrinth sealing sleeve is also fixedly connected to the rear housing. The labyrinth sealing sleeve and the main shaft rotate and seal against each other. After the main shaft, rotating shaft disk, and impeller rear disk are fixedly connected, an airflow cavity is formed between the main shaft, rotating shaft disk, impeller rear disk, and rear end housing; The outer end of the impeller rear disc is fixedly provided with a primary pressure relief buffer plate and a secondary pressure relief buffer plate. There are multiple primary pressure relief buffer plates and multiple secondary pressure relief buffer plates. The multiple primary pressure relief buffer plates are located at the outer circumference of the outer end of the impeller rear disc and are evenly distributed along the circumferential direction. The multiple secondary pressure relief buffer plates are located at the inner circumference of the outer end of the impeller rear disc and are evenly distributed along the circumferential direction. A pressure relief return channel with a narrow inner diameter and a wide outer diameter is provided between two adjacent primary pressure relief buffer plates and between two adjacent secondary pressure relief buffer plates.
2. The single-stage centrifugal blower with a pneumatic buffer reflux structure according to claim 1, characterized in that: The primary pressure relief buffer and the secondary pressure relief buffer are arranged radially symmetrically along the circumferential direction.
3. The single-stage centrifugal blower with a pneumatic buffer reflux structure according to claim 1, characterized in that: The primary and secondary pressure relief buffers are staggered with each other along the circumferential direction.
4. The single-stage centrifugal blower with a pneumatic buffer reflux structure according to any one of claims 2 or 3, characterized in that: The number of primary pressure relief buffers and secondary pressure relief buffers are eight each.
5. The single-stage centrifugal blower with a pneumatic buffer reflux structure according to claim 4, characterized in that: Both the primary pressure relief buffer and the secondary pressure relief buffer are sheet-like structures. The length of the first-stage pressure relief buffer plate is 15%-20% of the impeller rear disc diameter, the height of the first-stage pressure relief buffer plate is 15mm-20mm, and the thickness of the first-stage pressure relief buffer plate is 8%-10% of the impeller rear disc diameter. The length ratio of the secondary pressure relief buffer to the primary pressure relief buffer is 1:
2. The height of the secondary pressure relief buffer is 15mm-20mm, and the thickness of the secondary pressure relief buffer is 8%-10% of the impeller rear disc diameter.