Fan

Abstract

The fan comprises a volute, a limiting ring, a shell cover, a centrifugal impeller and a driving mechanism, an air inlet is formed in the center of one axial side of the volute, an assembly opening is formed in the other axial side of the volute, and an air outlet is formed in the circumferential direction of the volute; an air inlet channel is formed in the inner side of the limiting ring, the limiting ring is installed on the volute, and the air inlet channel is aligned to the air inlet; the shell cover is installed at the assembly opening, an air duct is defined by the shell cover, the peripheral wall of the limiting ring and the inner wall of the volute and communicates with the air outlet, an assembly interval is formed between the shell cover and the limiting ring, and a shaft hole is formed in the shell cover; the centrifugal impeller is arranged between the limiting ring and the shell cover and is matched with the air inlet channel; the driving mechanism is provided with an output shaft which penetrates through the shaft hole and is connected with the centrifugal impeller. Compared with a fan shell in the prior art, the production cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a fan. Background Art

[0002] Working Principle of Centrifugal Fan Centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. Its working principle is based on the principle of converting kinetic energy into potential energy. Specifically, it uses a high-speed rotating impeller to accelerate the gas, and then converts the kinetic energy into (pressure) potential energy by decelerating and changing the flow direction.

[0003] The existing fan is basically composed of a housing, an impeller and a motor. The motor housing is provided with a housing cover at one end face where the output shaft is provided. The housing cover covers the housing to encapsulate the impeller, and the impeller is connected to the output shaft. When the fan is working, the gas enters the impeller from the axial direction, changes to the radial direction after passing through the impeller, and is finally discharged from the air outlet of the housing.

[0004] Among them, the fan adopts a two-dimensional flow impeller or a three-dimensional flow impeller. The casing is designed to match the impeller on the one hand and to meet the design requirements of the pressure diffusion duct on the other hand, resulting in a more complex shape, high processing precision requirements, difficult production process, and high production cost. Utility Model Content

[0005] The main purpose of the utility model is to provide a fan, aiming to reduce the processing cost of the fan.

[0006] In order to achieve the above object, the utility model provides a fan, comprising:

[0007] A volute, wherein an air inlet is provided at the center of one axial side of the volute, an assembly port is provided at the other axial side of the volute, and an air outlet is provided on the circumference of the volute;

[0008] A limiting ring, an air inlet channel is formed inside the limiting ring, the limiting ring is mounted on the volute and the air inlet channel is aligned with the air inlet;

[0009] A shell cover, the shell cover is installed at the assembly opening, and is enclosed with the outer peripheral wall of the limiting ring and the inner wall of the volute to form an air duct, the air duct is connected to the air outlet, an assembly interval is formed between the shell cover and the limiting ring, and the shell cover is provided with an axial hole;

[0010] a centrifugal impeller, the centrifugal impeller being arranged between the limiting ring and the shell cover and cooperating with the air inlet channel; and

[0011] The driving mechanism comprises an output shaft, wherein the output shaft passes through the shaft hole and is connected to the centrifugal impeller.

[0012] In some embodiments of the present utility model, the limiting ring includes a guide ring portion and a wind shielding ring portion, the guide ring portion is connected to the volute, and an outer peripheral protrusion at one end of the guide ring portion away from the air inlet forms the wind shielding ring portion.

[0013] In some embodiments of the present invention, a portion of the peripheral side wall of the guide ring portion close to the air outlet is convexly arranged so that the cross-section of the air duct formed by the guide ring portion and the inner wall of the volute gradually increases along the air outlet direction.

[0014] In some embodiments of the utility model, a plurality of connection piles are protruded from one side of the shell cover facing the limiting ring, and the connection piles are arranged at intervals around the air inlet channel and connected to the wind shielding ring part.

[0015] In some embodiments of the present invention, the cross-section of the connecting pile is set to be crescent-shaped, and the connecting pile has an inner curved surface and an outer curved surface, the inner curved surface is set toward the centrifugal impeller, and the inner curved surface is gradually set away from the centrifugal impeller in the air outlet direction.

[0016] In some embodiments of the utility model, a plurality of first assembly holes are formed on a side of the connection pile facing the limiting ring, a plurality of first through holes are formed on the wind shielding ring portion, and a bolt passes through a first through hole and is assembled in a first assembly hole.

[0017] In some embodiments of the present invention, a boss is further provided on the side of the shell cover facing the limiting ring, the periphery of the boss is connected to the inner side surface of the connecting pile, and the axial hole passes through the boss.

[0018] In some embodiments of the present invention, a groove is provided on a side of the boss facing the centrifugal impeller, and a wheel disc of the centrifugal impeller is assembled in the groove.

[0019] In some embodiments of the present invention, an end surface of each of the connecting piles close to the limiting ring is configured as a step surface, and the periphery of the wind shielding ring portion cooperates with the step surface of each of the connecting piles.

[0020] In some embodiments of the utility model, a plurality of second assembly holes are provided on the end face of the limiting ring facing the air inlet, and the plurality of second assembly holes are arranged at intervals along the circumferential direction. The volute is provided with a plurality of second through holes around the air inlet, and one of the second through holes is aligned with one of the second assembly holes, and a bolt passes through one of the second through holes and is assembled in one of the second assembly holes.

[0021] Through the above scheme, when the fan is working, the driving mechanism drives the centrifugal impeller to rotate through the output shaft, draws air in from the air inlet, and discharges it from the air outlet after passing through the air duct. Among them, the shell of the fan can be divided into three parts with relatively simple shapes: volute, limit ring and shell cover. Compared with the fan shell in the prior art, the production difficulty is greatly reduced. During the processing, the limit ring can be processed with high precision, and then the limit ring can be assembled in the volute and shell cover. In this way, overall, the production cost of this scheme is greatly reduced compared with the prior art, and when the volute or the limit ring is damaged, only one of them can be replaced or repaired, and the maintenance cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of an embodiment of a fan provided by the utility model;

[0024] Figure 2 An exploded view of an embodiment of a fan provided by the utility model

[0025] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0026] Figure 4 A cross-sectional view of an embodiment of a fan provided by the utility model;

[0027] Figure 5 It is a schematic diagram of a part of the structure of the fan of the utility model;

[0028] Figure 6 It is a structural schematic diagram of a part of the structure of the fan of the utility model from another perspective;

[0029] Figure 7 The utility model is a schematic structural diagram of a volute and a limit ring in a fan according to an embodiment of the present invention.

[0030] Description of Figure Numbers:

[0031] 100. fan; 101. air duct; 10. volute; 11. air inlet; 12. assembly port; 13. air outlet; 14. second through hole; 15. third through hole; 20. limit ring; 21. air inlet channel; 22. guide ring; 23. wind shield ring; 24. first through hole; 25. second assembly hole; 30. shell cover; 31. shaft hole; 32. connecting pile; 321. inner arc surface; 322. outer arc surface; 323. first assembly hole; 324. step surface; 33. boss; 331. sink; 34. third assembly hole; 40. centrifugal impeller; 41. wheel disc; 50. driving mechanism; 51. output shaft.

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0036] With reference to the accompanying drawings, the utility model proposes a fan 100, including a volute 10, a stop ring 20, a shell cover 30, a centrifugal impeller 40 and a driving mechanism 50. An air inlet 11 is opened at the center of one axial side of the volute 10, an assembly port 12 is opened at the other axial side of the volute 10, and an air outlet 13 is arranged on the circumference of the volute 10; an air inlet channel 21 is formed on the inner side of the stop ring 20, and the stop ring 20 is installed on the volute 10 and the air inlet channel 21 is aligned with the air inlet 11. The shell cover 30 is installed at the assembly opening 12, and is enclosed with the outer peripheral wall of the limiting ring 20 and the inner wall of the volute 10 to form an air duct 101. The air duct 101 is connected to the air outlet 13. An assembly gap is formed between the shell cover 30 and the limiting ring 20, and the shell cover 30 is provided with an axial hole 31. The centrifugal impeller 40 is arranged between the limiting ring 20 and the shell cover 30, and cooperates with the air inlet channel 21. The driving mechanism 50 has an output shaft 51, which passes through the axial hole 31 and is connected to the centrifugal impeller 40.

[0037] The volute 10, the limit ring 20, the centrifugal impeller 40 and the shell cover 30 can be made of the same material or different materials. The three are generally made of metal materials, such as cast iron, aluminum alloy, steel, etc., and can also be made of aluminum alloy, stainless steel, nylon plastic, carbon steel, etc. These materials have high strength and corrosion resistance, and can withstand high-speed rotation and pressure when the fan 100 is running, and can maintain a stable shape for a long time. In addition, some applications with special requirements may choose to use a shell made of composite materials to meet specific performance requirements. The specific material is considered based on factors such as the use environment, working conditions and expected life of the fan 100, and is not limited here.

[0038] The centrifugal impeller 40 is a semi-open centrifugal impeller 40, which can be a binary flow impeller or a ternary flow impeller. The centrifugal impeller 40 has a wheel disc 41, a blade shaft located on one side of the wheel disc 41, and blades surrounding the blade shaft. The wheel disc 41 and the blade shaft are provided with mounting holes for assembling the output shaft 51 of the driving mechanism 50. The driving mechanism 50 can be driven by a fuel engine or an electric motor, and the output shaft 51 can be connected to the mounting hole of the impeller by interference fit, threaded connection, etc., which is not specifically limited here.

[0039] Through the above scheme, when the fan 100 is working, the driving mechanism 50 drives the centrifugal impeller 40 to rotate through the output shaft 51, draws air in from the air inlet 11, and discharges it from the air outlet 13 after passing through the air duct 101. Among them, the shell of the fan 100 can be divided into three parts of relatively simple shapes: the volute 10, the limit ring 20 and the shell cover 30. Compared with the shell of the fan 100 in the prior art, the production difficulty is greatly reduced. During the processing, the limit ring 20 can be processed with high precision, and then the limit ring 20 can be assembled in the volute 10 and the shell cover 30. In this way, overall, the production cost of this scheme is greatly reduced compared with the prior art, and when the volute 10 or the limit ring 20 is damaged, only one of them can be replaced or repaired, and the maintenance cost is lower.

[0040] In some embodiments of the present invention, the limiting ring 20 includes a guide ring portion 22 and a wind shield ring portion 23. The guide ring portion 22 is connected to the volute, and the outer periphery of the guide ring portion 22 away from the air inlet 11 is raised to form the wind shield ring portion 23. In this way, the structure of the air duct 101 can further ensure that the airflow can flow smoothly and avoid excessive turbulence and resistance. In addition, the part of the structure that is more difficult to process is integrated into the limiting ring 20, and the volute 10 has fewer inwardly concave structures, which is more convenient for processing and quality inspection, further reducing the processing difficulty of the volute 10, and reducing the overall processing difficulty of the fan 100.

[0041] Furthermore, in some embodiments of the present invention, the side wall of the guide ring 22 near the air outlet 13 is convexly arranged so that the cross-section of the air duct 101 formed by the guide ring 22 and the inner wall of the volute 10 gradually increases along the air outlet direction.

[0042] In the air duct 101, the flow direction of the gas changes, and the cross-sectional area of ​​the duct increases, resulting in airflow deceleration and pressure increase, and a better pressure diffusion effect, which can help reduce the pressure loss in the fan 100 system and improve the efficiency of the system. By expanding the airflow to a larger cross-sectional area, the airflow velocity can be reduced, and the friction resistance and kinetic energy loss can be reduced, thereby improving the overall efficiency of the system. In addition, since the airflow velocity is reduced, the friction and turbulence between the airflow and the inner wall of the air duct 101 are reduced, so the noise level generated by the system can be reduced. In addition, it can help improve the stability and reliability of the system. By reducing pressure loss and noise, the operating load of the system can be reduced, the service life of the equipment can be extended, and the possibility of maintenance and failure can be reduced.

[0043] In some embodiments of the present invention, a plurality of connection piles 32 are protruded from one side of the shell cover 30 facing the limiting ring 20. The connection piles 32 are arranged at intervals around the air inlet channel 21 and connected to the wind shielding ring portion 23. This can improve the overall stability, especially the connection stability between the limiting ring 20 and the shell cover 30, and avoid vibration caused by pressure difference changes. The connection piles 32 and the wind shielding ring portion 23 can be connected by welding or screwing, etc., which is not limited here.

[0044] In some embodiments of the present invention, the cross-section of the connecting pile 32 is set to be crescent-shaped, and the connecting pile 32 has an inner curved surface 321 and an outer curved surface 322. The inner curved surface 321 is set toward the centrifugal impeller 40, and the inner curved surface 321 is gradually set away from the centrifugal impeller 40 in the air outlet direction.

[0045] Through the above scheme, the curved outer side surface of the crescent-shaped connecting pile 32 is conducive to the smooth flow of airflow along the wind outlet direction. The connecting pile 32 is arranged on the side facing the impeller away from the impeller along the wind outlet direction, which is conducive to the gas between two adjacent blades of the impeller to flow out along the wind outlet direction. The shape and arrangement of the connecting pile 32 can ensure smooth and stable airflow.

[0046] Preferably, in some embodiments of the present invention, a plurality of first assembly holes 323 are formed on a side of the connection pile 32 facing the limiting ring 20, a plurality of first through holes 24 are formed on the wind shielding ring portion 23, and a bolt passes through a first through hole 24 and is assembled in a first assembly hole 323. With such a configuration, the housing cover 30 and the limiting ring 20 are easy to assemble and have good connection stability.

[0047] Furthermore, in some embodiments of the present invention, a boss 33 is further provided on the side of the shell cover 30 facing the limiting ring 20, the periphery of the boss 33 is connected to the inner side of the connecting pile 32, and the shaft hole 31 passes through the boss 33. In this way, the structural strength of the connecting pile 32 can be improved, the connecting pile 32 can be prevented from breaking, and the strength of the shell cover 30 can be improved.

[0048] In some embodiments of the utility model, a groove 331 is provided on one side of the boss 33 facing the centrifugal impeller 40, and the wheel 41 of the centrifugal impeller 40 is assembled in the groove 331. In this way, the groove 331 further limits the impeller, which can prevent the impeller from rotating eccentrically.

[0049] In some embodiments of the present invention, the end surface of each connecting pile 32 close to the limiting ring 20 is set as a step surface 324, and the periphery of the wind shielding ring part 23 cooperates with the step surface 324 of each connecting pile 32. In this way, during the assembly process, the wind shielding ring part 23 of the limiting ring 20 can be aligned with the step surface 324, the limiting ring 20 can be pre-installed on the shell cover 30, and the bolts can be assembled after adjustment, which can improve the convenience of assembly.

[0050] The stop ring 20 can be installed on the volute 10 by welding, which has high connection strength, good compactness and good sealing. In addition, in some embodiments of the utility model, the end face of the stop ring 20 facing the air inlet 11 is provided with a plurality of second assembly holes 25, and the plurality of second assembly holes 25 are arranged at intervals along the circumferential direction. The volute 10 is provided with a plurality of second through holes 14 around the air inlet 11, and a second through hole 14 is aligned with a second assembly hole 25, and a bolt passes through a second through hole 14 and is assembled in a second assembly hole 25. In this way, each component is modularized, and the cost of disassembling and repairing any damaged component is low.

[0051] In some embodiments of the utility model, a plurality of spaced third assembly holes 34 are provided on the periphery of the shell cover 30, a plurality of third through holes 15 are provided around the assembly opening 12 of the volute 10 and are aligned one by one with the third assembly holes 34, and the bolts pass through the third through holes 15 and are assembled in the third assembly holes 34.

[0052] Based on the above scheme, during the assembly process, the driving mechanism 50 and the centrifugal impeller 40 can be first assembled on opposite sides of the shell cover 30, and then the air inlet channel 21 of the limiting ring 20 can be aligned with the centrifugal impeller 40, and the limiting ring 20 can be installed on the shell cover 30, and finally the shell cover 30 can be installed on the volute 10, and the limiting ring 20 can be fixed at the air inlet 11 of the volute 10.

[0053] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fan, characterized in that: include: A volute, wherein an air inlet is provided at the center of one axial side of the volute, an assembly port is provided at the other axial side of the volute, and an air outlet is provided on the circumference of the volute; A limiting ring, an air inlet channel is formed inside the limiting ring, the limiting ring is mounted on the volute and the air inlet channel is aligned with the air inlet; A shell cover, the shell cover is installed at the assembly opening, and is enclosed with the outer peripheral wall of the limiting ring and the inner wall of the volute to form an air duct, the air duct is connected to the air outlet, an assembly interval is formed between the shell cover and the limiting ring, and the shell cover is provided with an axial hole; A centrifugal impeller, the centrifugal impeller is arranged between the limiting ring and the shell cover, and cooperates with the air inlet channel; as well as The driving mechanism comprises an output shaft, wherein the output shaft passes through the shaft hole and is connected to the centrifugal impeller.

2. The fan according to claim 1, characterized in that: The limiting ring includes a guide ring portion and a wind shielding ring portion, the guide ring portion is connected to the volute, and an outer peripheral protrusion at one end of the guide ring portion away from the air inlet forms the wind shielding ring portion.

3. The fan according to claim 2, characterized in that: The portion of the peripheral side wall of the guide ring portion close to the air outlet is convexly arranged so that the cross section of the air duct formed by the guide ring portion and the inner wall of the volute gradually increases along the air outlet direction.

4. The fan according to claim 2, characterized in that: A plurality of connection piles are protruded from one side of the shell cover facing the limiting ring. The connection piles are arranged at intervals around the air inlet channel and are connected to the wind shielding ring portion.

5. The fan according to claim 4, characterized in that: The cross section of the connecting pile is set to be crescent-shaped. The connecting pile has an inner curved surface and an outer curved surface. The inner curved surface is arranged toward the centrifugal impeller, and the inner curved surface is arranged gradually away from the centrifugal impeller in the air outlet direction.

6. The fan according to claim 4, characterized in that: A plurality of first assembly holes are formed on a side of the connection pile facing the limiting ring, and a plurality of first through holes are formed on the wind shielding ring portion. A bolt passes through a first through hole and is assembled in a first assembly hole.

7. The fan according to claim 4, characterized in that: A boss is also provided on one side of the shell cover facing the limiting ring, the periphery of the boss is connected to the inner side surface of the connecting pile, and the axial hole passes through the boss.

8. The fan according to claim 7, characterized in that: A sink groove is arranged on one side of the boss facing the centrifugal impeller, and a wheel disc of the centrifugal impeller is assembled in the sink groove.

9. The fan according to claim 4, characterized in that: An end surface of each of the connecting piles close to the limiting ring is arranged as a step surface, and the peripheral edge of the wind shielding ring portion cooperates with the step surface of each of the connecting piles.

10. The fan according to claim 1, characterized in that: The end surface of the limiting ring facing the air inlet is provided with a plurality of second assembly holes, and the plurality of second assembly holes are arranged at intervals along the circumferential direction. The volute is provided with a plurality of second through holes around the air inlet, and one of the second through holes is aligned with one of the second assembly holes, and a bolt passes through one of the second through holes and is assembled in one of the second assembly holes.

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