Disc type axial flow pipeline fan

Abstract

The utility model discloses a disc type axial flow pipeline fan which comprises a first supporting outer shell, a second supporting outer shell, a fan blade, a first fan blade and a second fan blade, a first space and a second space are arranged in the first supporting outer shell, the first space is an air outlet, and the second space is communicated with the first space; the second supporting shell is connected to one end of the first supporting shell and makes contact with the second space, the second supporting shell is provided with a third space, the third space is an air inlet, and the third space communicates with the second space; the fan impeller body is arranged in the first space, the second space and the third space; the disc type motor is connected to the first supporting shell, the second supporting shell and the fan impeller body and used for being in linkage with the fan impeller body to rotate, and after the fan impeller body rotates, air flow enters along the third space and is discharged out of the first space along the fan impeller body; therefore, the technical problems that an air channel is narrow due to the fact that the motor occupies space, airflow circulation is not smooth, and the ventilation and exhaust efficiency is reduced are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to ventilation equipment technical field, and specifically is a disc type axial pipeline fan. BACKGROUND

[0002] The axial fan is called "axial flow" because the gas to be transported flows parallel to the main shaft of the fan, which is widely used in constant temperature and humidity equipment, industrial furnace, air flow drying equipment, outdoor air ventilation equipment, waste gas treatment equipment and other fields, and plays a role of cooling, dust removal and purification, ventilation and the like;

[0003] The structure of the conventional axial fan generally comprises: a shell 100 having a hollow space inside; a support 200 connected to the shell 100 and arranged in the hollow space; a motor 300 connected to the support 200 and arranged in the hollow space; and a fan wheel 400 connected to the transmission shaft of the motor 300 and arranged in the hollow space and rotated by the motor 300.

[0004] Since the motor 300 is a common horizontal motor, the volume is relatively large, the motor 300 is connected to the support 200 and occupies part of the hollow space, resulting in a narrow air duct (the air duct is generally the gap between the motor 300 and the shell 100), when the airflow passes through the air duct in the axial direction during operation, the airflow is blocked by the motor 300, the resistance becomes large, therefore, it can only be applied to large-diameter pipeline ventilation, because the diameter of the pipeline is large (such as: diameter of 150 mm or more), under the condition that the diameter of the pipeline is large, the narrow air duct can also flow the airflow, but for small-diameter pipeline ventilation, the narrow air duct will cause the airflow to flow unsmoothly, reducing the ventilation efficiency. SUMMARY

[0005] In view of the above problems in the related art, the present application provides a disc type axial pipeline fan to solve the technical problem that the motor occupies space in the related art, resulting in a narrow air duct, airflow flow unsmoothly, and reducing the ventilation efficiency.

[0006] The technical solution to achieve the purpose is: a disc type axial pipeline fan, comprising:

[0007] A first support shell having a first space and a second space inside, the first space being an air outlet, and the second space being in communication with the first space;

[0008] A second support shell connected to one end of the first support shell, in contact with the second space, spaced apart from the first space, and having a third space on the second support shell, the third space being an air inlet, and the third space being in communication with the second space;

[0009] a fan wheel body arranged in the first space, the second space and the third space;

[0010] and a disc motor connected to the first support shell, the second support shell and the fan wheel body, arranged in the first space, the second space and the third space, used to link the rotation of the fan wheel body, and after the rotation of the fan wheel body, air flows into the third space, along the fan wheel body, and is discharged from the first space.

[0011] Further, the first support shell comprises: a first shell body, the first shell body having the first space and the second space therein, the volume size of the first space being smaller than that of the second space;

[0012] a plurality of guide vanes connected to the first shell body and evenly distributed at the first space;

[0013] and a first bearing chamber connected to the guide vanes, the first bearing chamber having a first inner hole thereon.

[0014] Further, the first shell body comprises: a first cylinder, the first cylinder having the second space therein, one end of the first cylinder being connected to the second support shell;

[0015] a first circular side plate connected to the other end of the first cylinder and blocking the second space;

[0016] and a second cylinder connected to the first circular side plate, the first circular side plate and the second cylinder having the first space at the middle position, and the center line of the second cylinder being on the same line as that of the first cylinder, the outer diameter size of the second cylinder being smaller than that of the first cylinder.

[0017] Further, the second support shell comprises: a second shell body connected to the first shell body and having the third space;

[0018] a plurality of inner support frames connected to the second shell body and evenly distributed at the third space;

[0019] and a second bearing chamber connected to the inner support frames, the second bearing chamber having a second inner hole thereon, the center line of the second inner hole being on the same line as that of the first inner hole.

[0020] Further, the second shell body comprises: a second circular side plate, the outer circle of the second circular side plate having a stopper, the stopper being inserted into one end of the first shell body, and a part of the second circular side plate entering the second space;

[0021] and a third cylinder connected to the second annular side plate, having the third space together with the second annular side plate at the middle position, and the center line of the third cylinder being on the same line as the center line of the second annular side plate, the outer diameter of the third cylinder being smaller than the outer diameter of the second annular side plate.

[0022] Further, the first space, the second space or the third space is a cylindrical space, and the center lines of the first space, the second space, the third space, the first inner hole and the second inner hole are on the same line.

[0023] Further, the fan blade body comprises a shaft sleeve.

[0024] A plurality of fan blades are evenly distributed on the outer circle of the shaft sleeve and are arranged at the middle position of the shaft sleeve.

[0025] Two wind-blocking protrusions are symmetrically connected to the ends of the shaft sleeve and are arranged apart from the fan blades, and a part of one of the wind-blocking protrusions is arranged in the first inner hole and a part of the other wind-blocking protrusion is arranged in the second inner hole.

[0026] An outer connecting seat is annularly connected to the fan blades, is arranged apart from the shaft sleeve, is on the same line as the center line of the shaft sleeve, and has a groove on the outer connecting seat.

[0027] An annular baffle is annularly connected to the fan blades, is on the same line as the center line of the shaft sleeve, one side of the annular baffle is connected to the outer connecting seat, the outer diameter of the annular baffle is smaller than the outer diameter of the outer connecting seat, a step is formed between the annular baffle and the outer connecting seat, and an airflow channel is formed between the annular baffle, the outer connecting seat, the fan blades and the shaft sleeve, the airflow channel communicates with the first space and the third space.

[0028] Further, the step has an inclined guide surface.

[0029] Further, the disc motor comprises a stator connected to the second space, annularly surrounding the fan blade body, gap-fitting with the fan blades and the annular baffle, and the center line of the stator being on the same line as the center line of the fan blade body.

[0030] A rotor is connected to the groove and has a first gap with the stator.

[0031] A first bearing is connected in the first inner hole.

[0032] A second bearing is connected in the second inner hole.

[0033] and a shaft, which is worn on the shaft sleeve, one end of which is connected with the first bearing, and the other end of which is connected with the second bearing.

[0034] Further, the first bearing or the second bearing has a second gap between the wind blocking protrusion, and the second gap is 0.05-0.5mm.

[0035] The above technical scheme has the following beneficial effects: compared with the related art, the disc axial pipeline fan is provided with a first support shell, a second support shell, a fan wheel body and a disc motor;

[0036] The first support shell has a first space and a second space, and the first space is an air outlet; the second support shell has a third space, and the third space is an air inlet; the disc motor drives the fan wheel body to rotate, and after the fan wheel body rotates, the airflow rotates under the action of the fan wheel body, enters along the third space, and is discharged from the first space along the axial direction and the fan wheel body;

[0037] Under the same parameter condition, the disc motor occupies relatively small space compared with the ordinary horizontal motor, so that the air duct is relatively open, and because the airflow rotates along the axial air duct under the action of the fan wheel body, the airflow circulation is relatively smooth, and the air exhaust efficiency is improved;

[0038] Therefore, the technical problem that the motor occupies space, causes the air duct to be narrow, the airflow circulation is not smooth, and the air exhaust efficiency is reduced is overcome, the technical effects that the motor occupies small space, the air duct is relatively open, the airflow circulation is relatively smooth, and the air exhaust efficiency is improved are achieved, the practicality is achieved, and the disc motor is not only suitable for large-diameter pipeline air exhaust, but also suitable for small-diameter pipeline air exhaust. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is one of the assembly explosion diagrams;

[0040] Figure 2 is the second assembly explosion diagram;

[0041] Figure 3 is Figure 1 or Figure 2 the combined partial sectional view;

[0042] Figure 4 is Figure 1 or Figure 2 the combined three-dimensional structure schematic view;

[0043] Figure 5 is the fan wheel body, the stator and the rotor explosion diagram;

[0044] Figure 6It is a partial enlarged schematic view of the combination of the fan blade body, the stator and the rotor.

[0045] Figure 7 It is an assembly view of the prior art.

[0046] In the figure: 10. First support shell, 11. First space, 12. Second space, 10-1. First shell body, 10-11. First cylinder, 10-11-1. Outlet hole, 10-12. First circular side plate, 10-13. Second cylinder, 10-2. Guide vane, 10-3. First bearing chamber, 10-31. First inner hole, 20. Second support shell, 20-1. Second shell body, 20-11. Second circular side plate, 20-11-1. Stop, 20-12. Third cylinder, 20-2. Inner support frame, 20-3. Second bearing chamber, 20-31. Second inner hole, 21. Third space, 30. Fan blade body, 30-1. Shaft sleeve, 30-2. Fan blade, 30-3. Wind blocking protrusion, 30-4. Outer connecting seat, 30-41. Groove, 30-42. Inclined guide surface, 30-5. Circular baffle, 40. Disc motor, 40-1. Stator, 40-11. Stator yoke, 40-12. Stator tooth, 40-2. Rotor, 40-21. First gap, 40-3. First bearing, 40-4. Second bearing, 40-5. Shaft, 100. Shell, 200. Support, 300. Motor, 400. Fan blade. DETAILED DESCRIPTION

[0047] In order to make the content easier to be clearly understood, the following is further detailed according to specific embodiments and in combination with the accompanying drawings;

[0048] A disc axial pipeline fan solves the technical problem in the related art that the motor occupies space, resulting in narrow air duct, airflow circulation is not smooth, and the efficiency of air circulation is reduced, can be manufactured and used, and achieves the positive effect of reducing the space occupied by the motor, relatively open air duct, relatively smooth airflow circulation, and improved efficiency of air circulation, and the overall idea is as follows:

[0049] An embodiment:

[0050] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 indicated; a disc axial pipeline fan comprises:

[0051] A first support shell 10, the first support shell 10 has a first space 11 and a second space 12 inside, the first space 11 is an air outlet, and the second space 12 communicates with the first space 11;

[0052] Second support shell 20, connected to one end of the first support shell 10, in contact with the second space 12, spaced from the first space 11, and the second support shell 20 has a third space 21, the third space 21 is the air inlet, the third space 21 is in communication with the second space 12;

[0053] Fan wheel body 30, provided in the first space 11, the second space 12 and the third space 21;

[0054] And disc motor 40, connected to the first support shell 10, the second support shell 20 and the fan wheel body 30, provided in the first space 11, the second space 12 and the third space 21, for linkage of the fan wheel body 30 rotation, and the fan wheel body 30 rotates, airflow along the third space 21 into, along the fan wheel body 30, by the first space 11 discharge;

[0055] Specifically, in implementation, provided with the first support shell 10, the second support shell 20, the fan wheel body 30 and the disc motor 40;

[0056] The first support shell 10 has a first space 11 and a second space 12, the first space 11 is the air outlet; The second support shell 20 has a third space 21, the third space 21 is the air inlet; Disc motor 40 linkage fan wheel body 30 rotation, fan wheel body 30 rotates, airflow under the action of the fan wheel body 30, airflow rotates, along the third space 21 into, along the axial, by the first space 11 discharge;

[0057] In the same parameter (here the parameter refers to, such as: power, speed) condition, compared with ordinary horizontal motor, the disc motor 40 occupies relatively small space, therefore, the air duct (air duct is roughly the third space 21, between the fan wheel 30-2 space, and the first space 11) is relatively open, and because of the airflow under the action of the fan wheel body 30, rotating along the axial air duct flow, realized airflow flow relatively smooth, improve the efficiency of the exhaust air;

[0058] Another embodiment:

[0059] As Figure 1 , Figure 2 , Figure 3 , Figure 4The first support shell 10 comprises a first shell body 10-1 having the first space 11 and the second space 12, the volume of the first space 11 is smaller than that of the second space 12; a plurality of guide vanes 10-2 connected to the first shell body 10-1 and arranged at the first space 11; and a first bearing chamber 10-3 connected to the guide vanes 10-2, the first bearing chamber 10-3 has a first inner hole 10-31;

[0060] The first shell body 10-1 comprises a first cylinder 10-11 having the second space 12, one end of the first cylinder 10-11 is connected to the second support shell 20; a first annular side plate 10-12 connected to the other end of the first cylinder 10-11 and blocking the second space 12; and a second cylinder 10-13 connected to the first annular side plate 10-12, the first space 11 is formed between the first annular side plate 10-12 and the second cylinder 10-13, and the center line of the second cylinder 10-13 is in line with the center line of the first cylinder 10-11, the outer diameter of the second cylinder 10-13 is smaller than that of the first cylinder 10-11; the first cylinder 10-11, the first annular side plate 10-12 and the second cylinder 10-13 are integrally formed, which is regular in shape and is beneficial for processing and manufacturing, and forms the first space 11 and the second space 12, the volume of the first space 11 is smaller than that of the second space 12, which is beneficial for connecting and arranging the fan blade body 30 and the disc motor 40, and the disc motor 40 occupies a relatively small space, fully utilizes the space, makes the air duct relatively open, and realizes relatively smooth airflow circulation;

[0061] The side wall of the first cylinder 10-11 has a wire outlet hole 10-11-1, which is beneficial for arranging wires;

[0062] The number of the guide vanes 10-2 is six, which are arc-shaped plate structures and are arranged at the first space 11, forming a guide, which is beneficial for airflow circulation, and the guide vanes 10-2 can support and connect the first bearing chamber 10-3;

[0063] The first inner hole 10-31 of the first bearing chamber 10-3 is connected to the first bearing 40-3, so that the first bearing 40-3 is reliably positioned, and the structure has relatively good reliability;

[0064] Another embodiment:

[0065] As Figure 1 , Figure 2 , Figure 3 , Figure 4The second support shell 20 comprises a second shell body 20-1 connected with the first shell body 10-1 and having the third space 21, a plurality of inner support frames 20-2 connected with the second shell body 20-1 and distributed at the third space 21, and a second bearing chamber 20-3 connected with the inner support frames 20-2, wherein the second bearing chamber 20-3 has a second inner hole 20-31, and the center line of the second inner hole 20-31 is in line with the center line of the first inner hole 10-31.

[0066] The second shell body 20-1 comprises a second circular side plate 20-11 having a stopper 20-11-1 on the outer circle of the second circular side plate 20-11, the stopper 20-11-1 is inserted into one end of the first shell body 10-1, and a part of the second circular side plate 20-11 enters the second space 12; and a third cylinder 20-12 connected with the second circular side plate 20-11, the second circular side plate 20-11 and the third cylinder 20-12 together have the third space 21 at the middle position, the center line of the third cylinder 20-12 is in line with the center line of the second circular side plate 20-11, and the outer diameter of the third cylinder 20-12 is smaller than the outer diameter of the second circular side plate 20-11; the second circular side plate 20-11 and the third cylinder 20-12 are integrally formed, have a regular shape, are convenient for processing and manufacturing, and form the third space 21, which is convenient for air flow circulation.

[0067] The stopper 20-11-1 is provided to facilitate the insertion into one end of the first shell body 10-1, and after the insertion, the second shell body 20-1 and the first shell body 10-1 are connected by screws or the stopper 20-11-1 is smeared with glue, so that the second shell body 20-1 and the first shell body 10-1 are bonded together after the insertion, and the assembly is convenient.

[0068] The inner support frames 20-2 are plate-shaped structures, and the number of the inner support frames 20-2 is three, which are distributed at the third space 21 and are convenient for supporting and connecting the second bearing chamber 20-3, and the structural reliability is relatively good.

[0069] The second inner hole 20-31 of the second bearing chamber 20-3 is connected with the second bearing 40-4, so that the second bearing 40-4 is reliably positioned, and the structural reliability is relatively good.

[0070] The center line of the second inner hole 20-31 is in line with the center line of the first inner hole 10-31, so that the coaxiality of the first bearing 40-3 and the second bearing 40-4 is relatively good, and after the first bearing 40-3 and the second bearing 40-4 are connected with the shaft 40-5, the shaft 40-5 can be reliably supported and smoothly rotated.

[0071] Another embodiment:

[0072] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 ; when implemented, the first space 11, the second space 12 or the third space 21 are cylindrical spaces, and the center lines of the first space 11, the second space 12, the third space 21, the first inner hole 10-31 and the second inner hole 20-31 are on the same straight line, ensuring coaxiality, and when the disc motor 40 is linked to the fan wheel body 30 to rotate, the stability is relatively good, and the vibration is reduced;

[0073] Another embodiment:

[0074] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 ; when implemented, the fan wheel body 30 includes: a shaft sleeve 30-1; a plurality of impeller blades 30-2, evenly distributed on the outer circle of the shaft sleeve 30-1, arranged at the middle position of the shaft sleeve 30-1; two wind blocking protrusions 30-3, symmetrically connected to the end of the shaft sleeve 30-1, spaced apart from the impeller blades 30-2, and a part of one of the wind blocking protrusions 30-3 is arranged in the first inner hole 10-31, and a part of the other wind blocking protrusion 30-3 is arranged in the second inner hole 20-31; an outer connecting seat 30-4 is connected around the impeller blades 30-2, spaced apart from the shaft sleeve 30-1, and the center line of the shaft sleeve 30-1 is on the same straight line, and the outer connecting seat 30-4 has a groove 30-41; and a circular ring-shaped baffle 30-5 is connected around the impeller blades 30-2, and the center line of the shaft sleeve 30-1 is on the same straight line, one side of the circular ring-shaped baffle 30-5 is connected with the outer connecting seat 30-4, the outer diameter size of the circular ring-shaped baffle 30-5 is smaller than the outer diameter size of the outer connecting seat 30-4, a step is formed between the circular ring-shaped baffle 30-5 and the outer connecting seat 30-4, and an airflow passage is formed between the circular ring-shaped baffle 30-5, the outer connecting seat 30-4, the impeller blades 30-2 and the shaft sleeve 30-1, and the airflow passage communicates with the first space 11 and the third space 21;

[0075] The shaft sleeve 30-1 is used to connect with the shaft 40-5, and the assembly is convenient;

[0076] The number of the impeller fan blades 30-2 is six, which are arc blades and are evenly distributed on the shaft sleeve 30-1, and when rotating, the impeller fan blades 30-2 are beneficial to driving the airflow circulation;

[0077] The wind blocking protrusion 30-3 is a circular protrusion, and has a second gap between the first bearing 40-3 or the second bearing 40-4, the second gap is 0.05-0.5 millimeters, which not only can form a block to block the first bearing 40-3 or the second bearing 40-4, but also will not wear and damage the first bearing 40-3 or the second bearing 40-4, at the same time, the volatilization speed of the lubricating liquid at the first bearing 40-3 or the second bearing 40-4 is reduced (the gas flow will accelerate the volatilization of the lubricating liquid), the dry grinding of the first bearing 40-3 or the second bearing 40-4 is prevented, and the first bearing 40-3 and the second bearing 40-4 are protected;

[0078] The outer connecting seat 30-4 is provided with a groove 30-41, which is beneficial to connecting the rotor 40-2 at the groove 30-41, fully utilizes the structural space, and makes the occupied space of the disc motor 40 relatively small;

[0079] The step has an inclined guide surface 30-42, the inclined guide surface 30-42 is arranged, a guide is formed, the rotor 40-2 is beneficial to being assembled into the groove 30-41, and the assembly is relatively convenient;

[0080] The circular ring-shaped baffle 30-5 forms a block to prevent the airflow from entering the first gap 40-21 (generally, there are solid particles in the airflow, the solid particles hit the stator 40-1 and the rotor 40-2 under the action of centrifugal force, and the stator 40-1 and the rotor 40-2 are easily damaged), and the stator 40-1 and the rotor 40-2 are protected;

[0081] Another embodiment:

[0082] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6The disc motor 40 comprises a stator 40-1 connected at the second space 12, surrounding the fan wheel body 30, and having a gap with the impeller blades 30-2 and the annular baffle 30-5, the center line of the stator 40-1 is in line with the center line of the fan wheel body 30; a rotor 40-2 connected at the groove 30-41 and having a first gap 40-21 with the stator 40-1; a first bearing 40-3 connected in the first inner hole 10-31; a second bearing 40-4 connected in the second inner hole 20-31; and a shaft 40-5 passing through the shaft sleeve 30-1, one end of which is connected with the first bearing 40-3 and the other end of which is connected with the second bearing 40-4;

[0083] The stator 40-1, the rotor 40-2, the first bearing 40-3 and the second bearing 40-4 are common structures in the prior art; the stator 40-1 comprises a stator yoke 40-11 and stator teeth 40-12; the rotor 40-2 is an annular structure; the first bearing 40-3 or the second bearing 40-4 is a ball bearing; which are not the points of the present application, but are only for better describing the present application and facilitating the understanding of the technical scheme of the present application, and the ordinary skilled in the art can directly and without doubt know how to set them up after seeing the disclosed content, without the need of creative labor or excessive experiments;

[0084] The stator 40-1 is connected at the second space 12, fully utilizing the structural space, reducing the occupied space of the disc motor 40, and not affecting the airflow rotation along the axial air duct, and the airflow circulation is relatively smooth;

[0085] The shaft 40-5 is a stepped shaft for connecting and supporting the fan wheel body 30, and the structural reliability is relatively good;

[0086] The working principle is as follows: the first support shell 10 has a first space 11 and a second space 12, the first space 11 is an air outlet; the second support shell 20 has a third space 21, the third space 21 is an air inlet; the disc motor 40 drives the fan wheel body 30 to rotate, after the fan wheel body 30 rotates, the airflow enters along the third space 21, passes through the fan wheel body 30, and is discharged from the first space 11;

[0087] In the description, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the positional relationship described in the drawings, and are only for the convenience of description or simplification of description, and do not indicate a specific orientation that must be had; the operation process described in the embodiments is not an absolute use step, and in actual use, corresponding adjustment can be made;

[0088] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms "first", "second", and similar terms do not imply any order, quantity, or importance, but are used to distinguish different components, and the terms "one", "another", and similar terms do not determine the quantity, but mean at least one, according to the content of the embodiments;

[0089] The above description is only the preferred specific implementation, but the protection scope is not limited to this, any person skilled in the art in the disclosed technical range, according to the technical solution and the inventive concept, equivalent replacement or change, should be covered in the protection scope of the application.

Claims

1. A disc-axial duct fan characterized by, The application relates to a fan, which comprises the following parts: a first supporting shell (10) with a first space (11) and a second space (12) in the first supporting shell (10), wherein the first space (11) is an air outlet, and the second space (12) is in communication with the first space (11); a second supporting shell (20) connected to one end of the first supporting shell (10), in contact with the second space (12), spaced apart from the first space (11), and provided with a third space (21) on the second supporting shell (20), wherein the third space (21) is an air inlet, and the third space (21) is in communication with the second space (12); a fan wheel body (30) arranged in the first space (11), the second space (12) and the third space (21); and a disc motor (40) connected to the first supporting shell (10), the second supporting shell (20) and the fan wheel body (30), arranged in the first space (11), the second space (12) and the third space (21), used for driving the fan wheel body (30) to rotate, and after the fan wheel body (30) rotates, air flows into the third space (21), passes through the fan wheel body (30) and is discharged from the first space (11). The first supporting shell (10) comprises a first shell body (10-1) with the first space (11) and the second space (12) in the first shell body (10-1), wherein the volume size of the first space (11) is smaller than that of the second space (12); a plurality of guide vanes (10-2) connected to the first shell body (10-1) and uniformly distributed at the first space (11); and a first bearing chamber (10-3) connected to the guide vanes (10-2), wherein the first bearing chamber (10-3) is provided with a first inner hole (10-31). The first shell body (10-1) comprises a first cylinder (10-11) with the second space (12) in the first cylinder (10-11), wherein one end of the first cylinder (10-11) is connected to the second supporting shell (20); a first annular side plate (10-12) connected to the other end of the first cylinder (10-11) and blocking the second space (12); and a second cylinder (10-13) connected to the first annular side plate (10-12), wherein the first space (11) is formed between the first annular side plate (10-12) and the second cylinder (10-13), the center line of the second cylinder (10-13) is in line with the center line of the first cylinder (10-11), and the outer diameter size of the second cylinder (10-13) is smaller than that of the first cylinder (10-11). The second supporting shell (20) comprises a second shell body (20-1) connected to the first shell body (10-1) and provided with the third space (21). ​ 2. A disc-axial duct fan according to claim 1, characterized in that: ​ ​ ​ 3. A disc-axial duct fan according to claim 2, characterized in that: ​ ​ ​ 4. A disc-axial duct fan according to claim 2, characterized in that: ​ A plurality of inner support frames (20-2) are connected to the second outer housing (20-1) and are uniformly distributed at the third space (21); A second bearing chamber (20-3) is connected to the inner support frame (20-2), and the second bearing chamber (20-3) has a second inner hole (20-31) which is in the same straight line with the center line of the first inner hole (10-31).

5. A disc-axial duct fan according to claim 4, characterized in that: The second outer housing (20-1) comprises a second circular side plate (20-11) which has a stopper (20-11-1) on the outer circle of the second circular side plate (20-11), the stopper (20-11-1) is inserted into one end of the first outer housing (10-1), and a part of the second circular side plate (20-11) enters the second space (12); A third cylinder (20-12) is connected to the second circular side plate (20-11), the second circular side plate (20-11) and the third cylinder (20-12) together have the third space (21) at the middle position, and the center line of the third cylinder (20-12) is in the same straight line with the center line of the second circular side plate (20-11), and the outer diameter of the third cylinder (20-12) is smaller than the outer diameter of the second circular side plate (20-11).

6. A disc-axial duct fan according to claim 5, characterized in that: The first space (11), the second space (12) or the third space (21) are all cylindrical spaces, and the center lines of the first space (11), the second space (12), the third space (21), the first inner hole (10-31) and the second inner hole (20-31) are in the same straight line.

7. A disc-axial duct fan according to claim 4 or 6, characterized in that: The fan wheel body (30) comprises a shaft sleeve (30-1); A plurality of fan blades (30-2) are uniformly distributed on the outer circle of the shaft sleeve (30-1) and are arranged at the middle position of the shaft sleeve (30-1); Two wind-blocking protrusions (30-3) are symmetrically connected to the end of the shaft sleeve (30-1) and are arranged apart from the fan blades (30-2), and a part of one of the wind-blocking protrusions (30-3) is arranged in the first inner hole (10-31), and a part of the other wind-blocking protrusion (30-3) is arranged in the second inner hole (20-31); An outer connecting seat (30-4) is annularly connected to the fan blades (30-2) and is arranged apart from the shaft sleeve (30-1), and the center line of the outer connecting seat (30-4) is in the same straight line with the center line of the shaft sleeve (30-1), and the outer connecting seat (30-4) has a groove (30-41). And a circular baffle (30-5) is connected to the impeller blade (30-2) and is coaxial with the center line of the shaft sleeve (30-1), one side of the circular baffle (30-5) is connected to the outer connecting seat (30-4), the outer diameter of the circular baffle (30-5) is smaller than that of the outer connecting seat (30-4), a step is formed between the circular baffle (30-5) and the outer connecting seat (30-4), and an airflow channel is formed between the circular baffle (30-5), the outer connecting seat (30-4), the impeller blade (30-2) and the shaft sleeve (30-1), and the airflow channel communicates with the first space (11) and the third space (21).

8. A disc-axial duct fan according to claim 7, characterized in that: The step has an inclined guide surface (30-42).

9. A disc-axial duct fan according to claim 7, characterized in that: The disc motor (40) comprises: a stator (40-1) connected to the second space (12) and surrounding the fan wheel body (30), and the stator (40-1) is in gap cooperation with the impeller blade (30-2) and the circular baffle (30-5), and the center line of the stator (40-1) is coaxial with the center line of the fan wheel body (30); A rotor (40-2) is connected to the groove (30-41) and has a first gap (40-21) with the stator (40-1); A first bearing (40-3) is connected in the first inner hole (10-31); A second bearing (40-4) is connected in the second inner hole (20-31); And a shaft (40-5) passes through the shaft sleeve (30-1), one end of the shaft (40-5) is connected to the first bearing (40-3), and the other end of the shaft (40-5) is connected to the second bearing (40-4).

10. A disc-axial duct fan according to claim 9, characterized in that: The first bearing (40-3) or the second bearing (40-4) has a second gap with the wind-blocking protrusion (30-3), and the second gap is 0.05-0.5mm.

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