Efficient two-stage centrifugal high-pressure fan

Abstract

The utility model relates to the field of high-pressure fans, and discloses an efficient two-stage centrifugal high-pressure fan. The air conditioner comprises a machine shell and a partition plate assembly, the partition plate assembly is arranged in the machine shell and divides the interior of the machine shell into a first cavity and a second cavity, an airflow inlet is formed in the peripheral wall, close to the first cavity, of the partition plate assembly, and a plurality of air guide grooves are formed in the partition plate assembly and communicate with the airflow inlet; an airflow outlet channel is formed in the side, close to the second cavity, of the partition plate assembly, the multiple air guide grooves communicate with the airflow outlet channel, airflow in the first cavity can enter the multiple air guide grooves from the airflow inlet, and the airflow in the air guide grooves is gathered in the airflow outlet channel and enters the second cavity. According to the utility model, an airflow medium can be stably and orderly conveyed in the fan, so that the stability and the reliability of the fan are improved; the shaft seal adopts multi-stage carbon ring sealing, so that the sealing effect of the shaft seal is improved; when the impeller rotates, explosion caused by sparks generated by friction is not prone to occurring.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure fans, and in particular to a high-efficiency two-stage centrifugal high-pressure fan. Background Art

[0002] A high-pressure fan refers to a fan with a wind pressure of 30KPa~50KPa under design conditions. A two-stage centrifugal high-pressure fan is a type of high-pressure fan. A two-stage centrifugal high-pressure fan consists of two centrifugal impellers connected in series, has a higher wind pressure, and is suitable for occasions requiring higher air volume and wind pressure.

[0003] Existing two-stage centrifugal high-pressure blowers have an annular partition placed between the two centrifugal impellers. This partition forms two chambers within the casing, with the two centrifugal impellers located in each chamber. The outer circumferential walls of the annular partition abut against the inner circumferential wall of the casing and are welded to the casing. Spiral blades are installed on the side of the annular partition near the centrifugal impeller at the air outlet to guide the airflow. The centrifugal impeller near the air inlet directs the airflow through the central circular hole of the annular partition into the other chamber. Once in the other chamber, the airflow, guided by the spiral blades, dissipates circumferentially and converges through the other centrifugal impeller before being discharged from the air outlet as high-pressure airflow.

[0004] However, in the chemical industry, certain key locations place extremely high demands on the stability and reliability of fans. In the aforementioned structure, the airflow dissipates circumferentially after passing through the annular baffle, which can easily cause turbulence and lead to poor stability of the airflow after output. Utility Model Content

[0005] In order to solve at least one aspect of the above problems, the utility model provides a high-efficiency two-stage centrifugal high-pressure fan, including a casing and a partition assembly, the partition assembly is arranged inside the casing and divides the interior of the casing into a first chamber and a second chamber, the first chamber and the second chamber are respectively provided with two centrifugal impellers, the partition assembly is provided with an air flow inlet near the outer peripheral wall of the first chamber, the air flow inlet is connected with the first chamber, the partition assembly is provided with a plurality of air guide grooves, and the plurality of air guide grooves are all connected with the air flow inlet, the partition assembly is provided with an air flow outlet channel on one side near the second chamber, the plurality of air guide grooves are arranged at intervals circumferentially about the air flow outlet channel and are all connected with the air flow outlet channel, when working, the air flow in the first chamber can enter the plurality of air guide grooves from the air flow inlet, and the air flow in the plurality of air guide grooves will converge in the air flow outlet channel and enter the second chamber.

[0006] Optionally, the high-efficiency two-stage centrifugal high-pressure blower further includes a bracket, which is detachably connected to the casing.

[0007] Optionally, the high-efficiency two-stage centrifugal high-pressure blower further includes a motor and a bearing box, wherein the motor and the casing are both connected to the bearing box, and the motor is suitable for driving the bearing box to operate to drive the centrifugal impeller to operate.

[0008] Optionally, a first centrifugal impeller is provided in the first chamber, a second centrifugal impeller is provided in the second chamber, a transmission shaft is provided for rotating the bearing box, the motor is suitable for driving the transmission shaft to rotate, and the first centrifugal impeller and the second centrifugal impeller are both connected to the transmission shaft and rotate synchronously.

[0009] Optionally, the partition assembly is sleeved on the transmission shaft and is loosely fitted with the transmission shaft. The partition assembly includes a first partition, a second partition and a spiral air guide blade. The first partition and the second partition are respectively fixedly connected to the opposite sides of the spiral air guide blade. The first partition is located on the side of the spiral air guide blade close to the first chamber. The spiral air guide blade is suitable for guiding the direction of airflow.

[0010] Optionally, the outer peripheral wall of the first partition is spaced apart from the inner peripheral wall of the casing to form the air flow inlet, the outer peripheral wall of the second partition is in contact with the inner peripheral wall of the casing, the air flow outlet channel is provided on the second partition, a plurality of spiral air guide blades are provided, and the plurality of spiral air guide blades are spaced apart around the outlet channel, the first partition, the second partition and two adjacent spiral air guide blades form the air guide groove, and the transmission shaft passes through the air flow outlet channel and is gap-matched with the air flow outlet channel.

[0011] Optionally, the second partition is provided with an explosion-proof ring, which is located at the airflow outlet channel. The transmission shaft passes through the explosion-proof ring and is gap-fitted with the explosion-proof ring. The explosion-proof ring is plug-connected to the second centrifugal impeller, and the explosion-proof ring is made of brass material.

[0012] Optionally, a multi-stage carbon ring seal is used at the connection between the casing and the transmission shaft.

[0013] Optionally, the casing is provided with an air inlet and an air outlet, the air inlet is connected to the first chamber, the air outlet is connected to the second chamber, the air inlet is provided with an air inlet flange suitable for connecting to a pipe, and the air outlet is provided with an air outlet flange suitable for connecting to a pipe.

[0014] Optionally, both the first centrifugal impeller and the second centrifugal impeller are backward high-efficiency impellers.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] 1. The outer peripheral wall of the first partition is spaced apart from the inner peripheral wall of the casing to facilitate airflow. After the gas medium in the first chamber is worked by the first centrifugal impeller, it enters the air guide groove from the gap between the circumference of the first partition and the casing. Then, under the guidance of multiple spiral air guide blades, it enters the air flow outlet channel in an orderly manner, converges together and enters the second chamber. The second centrifugal impeller works on the air flow that enters the second chamber in a stable and orderly manner, increasing the wind pressure of the air flow medium, and finally allows the air flow medium to enter the system pipeline stably from the air outlet;

[0017] 2. The first chamber and the second chamber are interconnected, which ensures the smooth flow of the air flow medium between the first centrifugal impeller and the second centrifugal impeller, reduces energy loss, and improves the pressure output capacity and efficiency of the fan;

[0018] 3. Both the first centrifugal impeller and the second centrifugal impeller adopt backward high-efficiency impellers, which have high efficiency and good aerodynamic performance. They can reduce energy consumption while ensuring pressure output and improve the overall performance of the fan;

[0019] 4. The air inlet flange and the air outlet flange make the connection between the fan and the pipeline more reliable and less likely to deform and affect the sealing. At the same time, the shaft seal adopts a multi-stage carbon ring seal, which further improves the sealing performance of the shaft seal and effectively prevents the medium from leaking from the shaft seal, ensuring the safety and reliability of the fan operation and reducing pollution to the environment and waste of the medium.

[0020] 5. In the chemical industry, some air flow media contain hydrogen and carbon monoxide, which are prone to explosion when encountering sparks. The setting of the explosion-proof ring allows the heat generated by the friction between the second centrifugal impeller and the explosion-proof ring during rotation to be quickly transferred and dissipated, making it less likely for sparks to be generated due to friction and cause explosions. At the same time, the setting of the explosion-proof ring can also enable the air flow medium in the air flow outlet channel to enter the second chamber smoothly and orderly, making turbulence less likely to occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the fan in the embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional view of the matching structure of the housing and the partition assembly of the embodiment of the utility model;

[0023] Figure 3 This is a diagram showing the internal structure of the casing in an embodiment of the present utility model;

[0024] Figure 4 for Figure 1 An enlarged view of the multi-stage carbon ring seal structure at the fan shaft seal in part A.

[0025] Explanation of the accompanying drawings: 1. Casing; 11. First chamber; 12. Second chamber; 13. First centrifugal impeller; 14. Second centrifugal impeller; 15. Air inlet flange; 16. Air outlet flange; 2. Partition assembly; 21. First partition; 22. Second partition; 23. Spiral air guide blade; 24. Air flow inlet; 25. Air guide groove; 26. Air flow outlet channel; 27. Explosion-proof ring; 3. Motor; 4. Bearing box; 5. Bracket. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] In the description of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate positions or location relationships based on the positions or location relationships during normal use of the product.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The utility model embodiment provides a high-efficiency two-stage centrifugal high-pressure blower, referring to Figure 1 and Figure 2 The high-efficiency two-stage centrifugal high-pressure blower includes a casing 1, a partition assembly 2, a motor 3, a bearing box 4 and a bracket 5. The casing 1, the partition assembly 2, the motor 3 and the bearing box 4 are all mounted on the bracket 5. The partition assembly 2 is mounted inside the casing 1 to divide the interior of the casing 1 into a first chamber 11 and a second chamber 12. A first centrifugal impeller 13 is provided for rotation in the first chamber 11, and a second centrifugal impeller 14 is provided for rotation in the second chamber 12. The motor 3 and the casing 1 are both connected to the bearing box 4, and the motor 3 is suitable for driving the bearing box 4 to operate to drive the first centrifugal impeller 13 and the second centrifugal impeller 14 to operate. Among them, the partition assembly 2 can make the airflow medium in the first chamber 11 enter the second chamber 12 stably and orderly and be discharged, thereby improving the stability of the blower.

[0031] The housing 1 has an air inlet on the side away from the bearing housing 4, and an air outlet at the top. The inlet communicates with the first chamber 11, and the outlet communicates with the second chamber 12. The inlet is equipped with an air inlet flange 15 suitable for connecting to a duct, and the outlet is equipped with an air outlet flange 16 suitable for connecting to a duct. This ensures a secure connection between the fan and the duct, preventing deformation that could compromise sealing. The housing 1 is bolted to the bracket 5. When inspecting, cleaning, or replacing parts within the fan, operators can easily separate the housing 1 from the bracket 5, improving maintenance efficiency and reducing both difficulty and cost.

[0032] Reference Figure 1 and Figure 2 The partition assembly 2 includes a first partition 21, a second partition 22, and a spiral air guide blade 23. The first partition 21 and the second partition 22 are both circular plates, and the central axes of the first partition 21 and the second partition 22 coincide with each other. The first partition 21 is located on the side of the spiral air guide blade 23 close to the first chamber 11. The spiral air guide blade 23 is an arc-shaped blade suitable for guiding the flow direction of the airflow. The spiral air guide blade 23 is located between the first partition 21 and the second partition 22. The first partition 21 and the second partition 22 are both welded to the spiral air guide blade 23. A plurality of spiral air guide blades 23 are provided, and the plurality of spiral air guide blades 23 are arranged circumferentially along the central axis of the first partition 21 at intervals.

[0033] Combine Figure 1 Reference Figure 2 and Figure 3 Specifically, the outer diameter of the first partition 21 is smaller than the outer diameter of the second partition 22, the spiral air guide blades 23 do not protrude from the first partition 21, and the outer peripheral wall of the first partition 21 is spaced apart from the inner peripheral wall of the casing 1. The gap between the outer peripheral wall of the first partition 21 and the inner peripheral wall of the casing 1 is defined as the airflow inlet 24, and the passages between the first partition 21, the second partition 22, and two adjacent spiral air guide blades 23 are defined as air guide grooves 25. Then, the multiple air guide grooves 25 are all interconnected with the airflow inlet 24. The second partition 22 is provided with an airflow outlet channel 26 on the side close to the second chamber 12. The spiral air guide blades 23 do not extend into the airflow outlet channel 26 to cause turbulence in the airflow, and the multiple air guide grooves 25 are all connected with the airflow outlet channel 26. The outer peripheral wall of the second partition 22 abuts against the inner peripheral wall of the casing 1 and is welded to the casing 1.

[0034] During operation, the air flow medium first enters the first chamber 11 through the air inlet. After the gas medium in the first chamber 11 is worked by the first centrifugal impeller 13, it enters the multiple air guide grooves 25 from the air flow inlet 24. Then, under the guidance of multiple spiral air guide blades 23, it enters the air flow outlet channel 26 in an orderly manner, gathers together and enters the second chamber 12. The second centrifugal impeller 14 works on the air flow that enters the second chamber 12 stably and orderly to increase the wind pressure of the air flow medium, and finally makes the air flow medium stably discharged from the air outlet.

[0035] Combine Figure 1 Reference Figure 2 and Figure 3 A drive shaft extends from the side of the bearing housing 4 near the base housing. The drive shaft is rotatably connected to the bearing housing 4. The motor 3 is connected to the bearing housing 4 to drive the drive shaft. The first centrifugal impeller 13 and the second centrifugal impeller 14 are both connected to the drive shaft and rotate synchronously. In this embodiment, the bearing housing 4 preferably adopts a monolithic structure, which provides better support and reduces vibration and displacement of the drive shaft during high-speed rotation, adapting to various high-speed operating conditions and improving the operational stability and reliability of the fan.

[0036] The drive shaft is inserted into the housing 1. A first sleeve and a second sleeve are spaced apart on the drive shaft. The first sleeve is located within the first chamber 11; the second sleeve is located within the second chamber 12. Both the first sleeve and the second sleeve rotate synchronously with the drive shaft. A first centrifugal impeller 13 is sleeved on the first sleeve and rotates synchronously with the first sleeve. A second centrifugal impeller 14 is sleeved on the second sleeve and rotates synchronously with the second sleeve. Consequently, when the motor 3 drives the drive shaft to rotate, it also drives the first centrifugal impeller 13 and the second centrifugal impeller 14 to rotate. In this embodiment, it is preferred that both the first centrifugal impeller 13 and the second centrifugal impeller 14 are backward-facing, high-efficiency impellers. This ensures that pressure output is maintained while reducing energy consumption and improving the overall performance of the fan.

[0037] Combine Figure 1 Reference Figure 2 and Figure 3The end of the transmission shaft away from the bearing housing 4 passes through the second partition plate 22 and the first partition plate 21 in sequence. The transmission shaft passes through the airflow outlet channel 26 and is loosely fitted with the airflow outlet channel 26, thereby ensuring that the airflow medium flows into the second chamber 12 through the airflow outlet channel 26. An explosion-proof ring 27 is installed on the side of the second partition plate 22 close to the second chamber 12 by rivets. The central axis of the explosion-proof ring 27 coincides with the central axis of the second partition plate 22. The explosion-proof ring 27 is located at the opening of the airflow outlet channel 26. The airflow outlet channel 26 is located inside the explosion-proof ring 27 and is interconnected with the explosion-proof ring 27. The cross-section of the explosion-proof ring 27 is "L"-shaped. The explosion-proof ring 27 is plug-connected to the second centrifugal impeller 14, thereby ensuring that the airflow medium can stably enter the second chamber 12 and perform work through the second centrifugal impeller 14. The transmission shaft passes through the explosion-proof ring 27 and is loosely fitted with the explosion-proof ring 27, thereby ensuring the circulation of the airflow medium. The inner diameter of the first partition 21 is smaller than the inner diameter of the explosion-proof ring 27, so that the airflow can be stably discharged from the airflow outlet channel 26 into the second chamber 12. After the transmission shaft passes through the first partition 21, it will also be loosely matched with the first partition 21, thereby reducing the risk of sparks caused by friction.

[0038] The explosion-proof ring 27 is made of brass. Some air flow media in the chemical industry contain hydrogen and carbon monoxide, which are prone to explosion when encountering sparks. The setting of the explosion-proof ring 27 allows the heat generated by the friction between the second centrifugal impeller 14 and the explosion-proof ring 27 during rotation to be quickly transferred and dissipated, making it less likely for sparks generated by friction to cause explosion.

[0039] Reference Figure 1 and Figure 4 , wherein the connection between the casing 1 and the transmission shaft is set as the shaft seal of the fan, and a carbon ring seal is selected for the shaft seal (a carbon ring seal is a method of sealing shaft connections in the prior art, which is a mechanical engineering term and will not be described in detail). In order to improve the sealing effect here, this embodiment adopts a multi-stage carbon ring seal (a multi-stage carbon ring seal refers to a plurality of sealing carbon rings arranged at adjacent intervals).

[0040] The implementation principle of a high-efficiency two-stage centrifugal high-pressure blower in the embodiment of the present application is as follows: the outer peripheral wall of the first partition 21 and the inner peripheral wall of the casing 1 are spaced apart to facilitate the circulation of the air flow medium. During operation, the air flow medium first enters the first chamber 11 through the air inlet. After the gas medium in the first chamber 11 is worked by the first centrifugal impeller 13, it will enter the multiple air guide grooves 25 from the air flow inlet 24, and then enter the air flow outlet channel 26 in an orderly manner under the guidance of multiple spiral air guide blades 23 and gather together. Since the explosion-proof ring 27 and the second centrifugal impeller 14 are plug-in connected, the air flow medium will enter the second chamber 12 in an orderly and smooth manner, and after the second centrifugal impeller 14 works, the wind pressure of the air flow medium will be increased and discharged from the air outlet, thereby meeting the high-pressure requirements of the chemical industry and providing reliable equipment support for gas transportation, pressure increase and other links in the chemical production process.

[0041] The first centrifugal impeller 13 and the second centrifugal impeller 14 are both backward high-efficiency impellers with high efficiency and good aerodynamic performance. They can reduce energy consumption while ensuring pressure output and improve the overall performance of the fan.

[0042] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present utility model.

Claims

1. A high-efficiency two-stage centrifugal high-pressure blower, characterized by: The invention comprises a casing (1) and a partition assembly (2), wherein the partition assembly (2) is arranged inside the casing (1) and divides the inside of the casing (1) into a first chamber (11) and a second chamber (12), wherein the first chamber (11) and the second chamber (12) are respectively provided with two centrifugal impellers, and the partition assembly (2) is provided with an air flow inlet (24) near the outer peripheral wall of the first chamber (11), wherein the air flow inlet (24) is communicated with the first chamber (11), and the partition assembly (2) is provided with a plurality of air guide grooves (25) inside the partition assembly (2), wherein the plurality of air guide grooves (25) are provided with a plurality of air guide grooves (25). ) are all connected to the air flow inlet (24), the partition assembly (2) is provided with an air flow outlet channel (26) on the side close to the second chamber (12), and the plurality of air guide grooves (25) are arranged at intervals in the circumferential direction of the air flow outlet channel (26) and are all connected to the air flow outlet channel (26). When working, the air flow in the first chamber (11) can enter the plurality of air guide grooves (25) from the air flow inlet (24), and the air flow in the plurality of air guide grooves (25) will converge in the air flow outlet channel (26) and enter the second chamber (12).

2. A high-efficiency two-stage centrifugal high-pressure blower according to claim 1, characterized in that: It also includes a bracket (5), and the bracket (5) is detachably connected to the casing (1).

3. A high-efficiency two-stage centrifugal high-pressure blower according to any one of claims 1-2, characterized in that: It also includes a motor (3) and a bearing box (4), wherein the motor (3) and the housing (1) are both connected to the bearing box (4), and the motor (3) is suitable for driving the bearing box (4) to operate so as to drive the centrifugal impeller to operate.

4. The high-efficiency two-stage centrifugal high-pressure blower according to claim 3, characterized in that: A first centrifugal impeller (13) is provided in the first chamber (11), a second centrifugal impeller (14) is provided in the second chamber (12), a transmission shaft is rotatably provided in the bearing box (4), the motor (3) is suitable for driving the transmission shaft to rotate, and the first centrifugal impeller (13) and the second centrifugal impeller (14) are both connected to the transmission shaft and rotate synchronously.

5. The high-efficiency two-stage centrifugal high-pressure blower according to claim 4, characterized in that: The partition assembly (2) is sleeved on the transmission shaft and is loosely fitted with the transmission shaft. The partition assembly (2) comprises a first partition (21), a second partition (22) and a spiral air guide blade (23). The first partition (21) and the second partition (22) are fixedly connected to opposite sides of the spiral air guide blade (23). The first partition (21) is located on a side of the spiral air guide blade (23) close to the first chamber (11). The spiral air guide blade (23) is suitable for guiding the flow direction of the airflow.

6. The high-efficiency two-stage centrifugal high-pressure blower according to claim 5, characterized in that: The outer peripheral wall of the first partition (21) is spaced apart from the inner peripheral wall of the housing (1) to form the airflow inlet (24); the outer peripheral wall of the second partition (22) is in contact with the inner peripheral wall of the housing (1); the airflow outlet channel (26) is provided on the second partition (22); a plurality of spiral air guide blades (23) are provided, and the plurality of spiral air guide blades (23) are spaced apart and arranged around the outlet channel; the first partition (21), the second partition (22) and two adjacent spiral air guide blades (23) form the air guide groove (25); the transmission shaft passes through the airflow outlet channel (26) and is clearance-matched with the airflow outlet channel (26).

7. The high-efficiency two-stage centrifugal high-pressure blower according to claim 5, characterized in that: The second partition (22) is provided with an explosion-proof ring (27), the explosion-proof ring (27) is located at the airflow outlet channel (26), the transmission shaft passes through the explosion-proof ring (27) and is gap-matched with the explosion-proof ring (27), the explosion-proof ring (27) is plug-connected to the second centrifugal impeller (14), and the explosion-proof ring (27) is made of brass material.

8. The high-efficiency two-stage centrifugal high-pressure blower according to claim 4, characterized in that: The connection between the housing (1) and the transmission shaft is sealed with a multi-stage carbon ring.

9. The high-efficiency two-stage centrifugal high-pressure blower according to claim 4, characterized in that: The housing (1) is provided with an air inlet and an air outlet, the air inlet is communicated with the first chamber (11), the air outlet is communicated with the second chamber (12), the air inlet is provided with an air inlet flange (15) suitable for connection to a pipeline, and the air outlet is provided with an air outlet flange (16) suitable for connection to a pipeline.

10. The high-efficiency two-stage centrifugal high-pressure blower according to claim 4, characterized in that: The first centrifugal impeller (13) and the second centrifugal impeller (14) are both backward high-efficiency impellers.

Images