Medium-high pressure axial flow fan

Abstract

The utility model discloses a medium-high pressure axial flow fan which comprises a plurality of fan units, each fan unit comprises a fan cylinder, a motor is arranged in the fan cylinder, the motor is fixedly connected with the fan cylinder through a plurality of connecting ribs, and an impeller is fixedly connected to a driving shaft of the motor. Every two adjacent fan units are isolated through a buffer part, every two adjacent fan units and the buffer parts are fixedly connected through bolts, each buffer part comprises a rubber ring, and the side faces of every two adjacent fan units abut against the two sides of the corresponding rubber ring respectively. The adjacent draught fan units are separated through the buffering pieces, vibration superposition between the draught fan units can be effectively reduced, and therefore the resonance risk is reduced.

Description

Technical Field

[0001] This utility model relates to fans, and more specifically, to a medium- and high-pressure axial flow fan. Background Technology

[0002] Most medium and high pressure axial flow fans are formed by connecting multiple fan units in series. The total air volume remains unchanged after the fans are connected in series, but the air pressure can be superimposed to form a medium and high pressure axial flow fan, which can be used for ventilation of buildings with large building areas. However, the vibration of the fans during operation will be superimposed after they are connected in series, which increases the risk of resonance and noise, and affects the safety of the fan operation. Therefore, there is an urgent need to improve this. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a medium- and high-pressure axial flow fan. Adjacent fan units are separated by buffer components, which can effectively reduce the vibration superposition between fan units and thus reduce the risk of resonance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a medium-high pressure axial flow fan, comprising multiple fan units, each fan unit comprising a fan casing, a motor being installed inside the fan casing, the motor being fixedly connected to the fan casing via multiple connecting ribs, and an impeller being fixedly connected to the drive shaft of the motor;

[0005] The two adjacent fan units are isolated by a buffer, and the two adjacent fan units and the buffer are fixedly connected by bolts. The buffer includes a rubber ring, and the sides of the two adjacent fan units respectively abut against the two sides of the rubber ring.

[0006] Furthermore, the rubber ring includes a first annular surface and a second annular surface, which are connected by a first connecting surface. A support ring is provided on the surface of the first connecting surface. Flange rings are provided at both ends of the fan cylinder. The outer wall of the flange ring abuts against the inner wall of the first annular surface, the inner wall of the flange ring abuts against the outer wall of the second annular surface, and the side of the flange ring abuts against the side of the support ring. The bolt passes through the flange rings and support rings of the two fan cylinders and is fixed to the two fan cylinders and the buffer component by nuts.

[0007] Furthermore, the rubber ring is made of EPDM rubber, and the hardness of the rubber ring is in the range of 60-70 degrees.

[0008] Furthermore, the buffer includes a rigid ring that divides the rubber ring into two annular components. The rigid ring includes a third annular surface and a fourth annular surface, which are connected by a second connecting surface. The inner wall of the third annular surface abuts against the outer wall of the first annular surface, and the outer wall of the fourth annular surface abuts against the inner wall of the second annular surface. The second connecting surface penetrates the rubber ring.

[0009] Furthermore, the rubber ring and the rigid ring are integrally molded by secondary injection molding.

[0010] Furthermore, it also includes a crossbeam, and the fan unit is fixedly connected to the crossbeam by a flexible steel beam.

[0011] Furthermore, the flexible steel beam includes a flexible plate, with a first connecting platform and a second connecting platform respectively provided at both ends of the flexible plate. The first connecting platform is fixedly connected to the outer wall of the fan casing, and the second connecting platform is fixedly connected to the crossbeam.

[0012] Furthermore, the flexible plate has an S-shaped cross-section and is arranged along the axial direction of the fan casing.

[0013] Furthermore, the connection between the flexible plate and the first connecting platform is made by a rounded transition, and the connection between the flexible plate and the second connecting platform is made by a rounded transition.

[0014] In summary, this utility model has the following beneficial effects:

[0015] By incorporating EPDM rubber rings, which are resistant to aging, high temperatures, and corrosion, these rings not only act as a buffer during operation of the fan units, greatly reducing the superposition of vibrations between the two fan units and lowering the risk of resonance, thus improving safety, but also seal the two fan units to prevent air leakage between them. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0017] Figure 2 for Figure 1 Enlarged view at point A;

[0018] Figure 3 This is a schematic diagram of a flexible steel beam.

[0019] Figure 4 This is a partial structural diagram of the buffer component.

[0020] Reference numerals: 1. Fan unit; 2. Fan casing; 21. Connecting rib; 22. Flange ring; 3. Motor; 31. Impeller; 4. Buffer; 5. Rubber ring; 51. First annular surface; 52. Second annular surface; 53. First connecting surface; 54. Support ring; 6. Rigid ring; 61. Third annular surface; 62. Fourth annular surface; 63. Second connecting surface; 7. Crossbeam; 8. Flexible steel beam; 81. Flexible plate; 82. First connecting platform; 83. Second connecting platform; 84. Arc; 9. Bolt. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1 to 4 As shown, this embodiment discloses a medium-high pressure axial flow fan, including multiple fan units 1. Each fan unit 1 includes a fan casing 2, and a motor 3 is installed inside the fan casing 2. The motor 3 and the fan casing 2 are fixedly connected by multiple connecting ribs 21. An impeller 31 is fixedly connected to the drive shaft of the motor 3. In this embodiment, there are three fan units 1. Each fan unit 1 can generate a wind pressure of 500Pa. When the three fan units 1 are connected in series, a wind pressure of 1500Pa can be generated, achieving a medium-high pressure effect.

[0023] Two adjacent fan units 1 are isolated by a buffer 4. The two adjacent fan units 1 and the buffer 4 are fixedly connected by bolts 9. The buffer 4 includes a rubber ring 5. The sides of the two adjacent fan units 1 respectively abut against the two sides of the rubber ring 5. The rubber ring 5 is made of EPDM rubber and has a hardness range of 60-70 degrees, preferably 65 degrees (Shore hardness). By setting the rubber ring 5 of EPDM material, it has the characteristics of aging resistance, high temperature resistance and corrosion resistance. It can not only play a buffering role when the fan unit 1 is working, greatly reducing the vibration superposition of the two fan units 1, reducing the risk of resonance and thus improving safety, but also play a sealing role for the two fan units 1, preventing air leakage between the two fan units 1.

[0024] like Figure 2 As shown, specifically, the rubber ring 5 includes a first annular surface 51 and a second annular surface 52. The first annular surface 51 and the second annular surface 52 are connected by a first connecting surface 53. A support ring 54 is provided on the surface of the first connecting surface 53. Flange rings 22 are provided at both ends of the fan cylinder 2. The outer wall of the flange ring 22 abuts against the inner wall of the first annular surface 51, the inner wall of the flange ring 22 abuts against the outer wall of the second annular surface 52, and the side of the flange ring 22 abuts against the side of the support ring 54. The bolt 9 passes through the flange rings 22 and the support rings 54 of the two fan cylinders 2 and is fixed to the two fan cylinders 2 and the buffer 4 by nuts.

[0025] By setting the first annular surface 51 and the second annular surface 52, the inner and outer walls of the flange ring 22 can be effectively wrapped, thereby not only effectively isolating the two fan casings 2, but also improving the sealing performance between the two fan casings 2.

[0026] The buffer component 4 includes a rigid ring 6, which divides the rubber ring 5 into two annular components. The rigid ring 6 includes a third annular surface 61 and a fourth annular surface 62, which are connected by a second connecting surface 63. The inner wall of the third annular surface 61 abuts against the outer wall of the first annular surface 51, and the outer wall of the fourth annular surface 62 abuts against the inner wall of the second annular surface 52. The second connecting surface 63 penetrates the rubber ring 5. The rubber ring 5 and the rigid ring 6 are integrally molded by secondary injection molding. The rigid ring 6 is equivalent to the rigid skeleton of the buffer component 4, which can play a shaping role on the outside of the rubber ring 5. Thus, while playing a shock absorption and buffering role, it can effectively ensure the connection strength between the two fan cylinders 2, and the structure has good reliability.

[0027] like Figure 1 and Figure 3 As shown, this embodiment also includes a crossbeam 7. The fan unit 1 and the crossbeam 7 are fixedly connected by a flexible steel beam 8. The fan unit is fixed to the external building through the crossbeam 7. The fan unit 1 is suspended.

[0028] The flexible steel beam 8 includes a flexible plate 81. The flexible plate 81 has a first connecting platform 82 and a second connecting platform 83 at both ends. The first connecting platform 82 is fixedly connected to the outer wall of the fan casing 2, and the second connecting platform 83 is fixedly connected to the crossbeam 7. The flexible plate 81 has an S-shaped cross section and is arranged along the axial direction of the fan casing 2. By setting the S-shaped flexible plate 81, not only can the reliability of the connection between the fan unit 1 and the crossbeam 7 be ensured, but also when the fan unit 1 vibrates during operation, the flexible plate 81 reduces the transmission of vibration through slight deformation due to resonance, thereby improving the reliability of the crossbeam 7 fixed to the external building and reducing the risk of resonance of multiple fan units 1.

[0029] The connection between the flexible plate 81 and the first connecting platform 82 is transitioned by an arc 84, and the connection between the flexible plate 81 and the second connecting platform 83 is also transitioned by an arc 84. The transition by the arc 84 can improve the reliability of the connection between the flexible plate 81 and the first connecting platform 82 and the second connecting platform 82.

[0030] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A medium-high pressure axial flow fan, characterized in that, It includes multiple fan units (1), each fan unit (1) includes a fan casing (2), a motor (3) is provided inside the fan casing (2), the motor (3) and the fan casing (2) are fixedly connected by multiple connecting ribs (21), and an impeller (31) is fixedly connected to the drive shaft of the motor (3); The two adjacent fan units (1) are isolated by a buffer (4). The two adjacent fan units (1) and the buffer (4) are fixedly connected by bolts (9). The buffer (4) includes a rubber ring (5). The sides of the two adjacent fan units (1) respectively abut against the two sides of the rubber ring (5).

2. The medium-high pressure axial flow fan according to claim 1, characterized in that, The rubber ring (5) includes a first annular surface (51) and a second annular surface (52). The first annular surface (51) and the second annular surface (52) are connected by a first connecting surface (53). A support ring (54) is provided on the surface of the first connecting surface (53). Flange rings (22) are provided at both ends of the fan cylinder (2). The outer wall of the flange ring (22) abuts against the inner wall of the first annular surface (51). The inner wall of the flange ring (22) abuts against the outer wall of the second annular surface (52). The side of the flange ring (22) abuts against the side of the support ring (54). The bolt (9) passes through the flange ring (22) and the support ring (54) of the two fan cylinders (2) and fixes the two fan cylinders (2) and the buffer (4) with nuts.

3. A medium-high pressure axial flow fan according to claim 2, characterized in that, The rubber ring (5) is made of EPDM rubber, and the hardness range of the rubber ring (5) is 60-70 degrees.

4. A medium-high pressure axial flow fan according to claim 2, characterized in that, The buffer (4) includes a rigid ring (6), which divides the rubber ring (5) into two annular parts. The rigid ring (6) includes a third annular surface (61) and a fourth annular surface (62). The third annular surface (61) and the fourth annular surface (62) are connected by a second connecting surface (63). The inner wall of the third annular surface (61) abuts against the outer wall of the first annular surface (51), and the outer wall of the fourth annular surface (62) abuts against the inner wall of the second annular surface (52). The second connecting surface (63) penetrates the rubber ring (5).

5. A medium-high pressure axial flow fan according to claim 4, characterized in that, The rubber ring (5) and the rigid ring (6) are integrally molded by secondary injection molding.

6. A medium-high pressure axial flow fan according to claim 1, characterized in that, It also includes a crossbeam (7), and the fan unit (1) is fixedly connected to the crossbeam (7) by a flexible steel beam (8).

7. A medium-high pressure axial flow fan according to claim 6, characterized in that, The flexible steel beam (8) includes a flexible plate (81), and the two ends of the flexible plate (81) are respectively provided with a first connecting platform (82) and a second connecting platform (83). The first connecting platform (82) is fixedly connected to the outer wall of the fan casing (2), and the second connecting platform (83) is fixedly connected to the crossbeam (7).

8. A medium-high pressure axial flow fan according to claim 7, characterized in that, The flexible plate (81) has an S-shaped cross section and is arranged along the axial direction of the fan casing (2).

9. A medium-high pressure axial flow fan according to claim 8, characterized in that, The connection between the flexible plate (81) and the first connecting platform (82) is transitioned by an arc (84), and the connection between the flexible plate (81) and the second connecting platform (83) is transitioned by an arc (84).

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