A mixed flow fan

Abstract

The present application discloses a mixed flow fan, which relates to the technical field of ventilation equipment, including a duct shell, wherein a mixed flow blade is coaxially connected to the duct shell, a driving source is also arranged in the duct shell, the driving source includes an outwardly extending output shaft, and the output shaft of the driving source is coaxially fixed with the mixed flow blade to drive the mixed flow blade to rotate; a limit ring is arranged on the outer shell of the duct shell, the limit ring is detachably connected to the outside of the duct shell, a limit protrusion is arranged on the side of the limit ring away from the duct shell, a rotating ring is arranged on the outer shell of the limit ring, a limit groove is arranged on the inner side of the rotating ring, the limit groove matches the shape of the limit protrusion, and the limit protrusion slides in the limit groove; a mounting seat is arranged on the outer side of the rotating ring, the mounting seat is used to connect with other components to fix the position of the mixed flow fan, and a locking assembly is also arranged on the limit ring, and the locking assembly is used to limit the rotation between the rotating ring and the limit ring. The present application has the effect of improving the convenience of installation of the mixed flow fan.

Description

Technical Field

[0001] The present application relates to the technical field of ventilation equipment, and in particular to a mixed flow fan. Background Art

[0002] A mixed flow fan is a fan between an axial flow fan and a centrifugal fan. The impeller of a mixed flow fan allows the air to move both centrifugally and axially. The movement of the air in the shell is a mixture of axial and centrifugal movement, so it is called "mixed flow". The wind pressure coefficient of a mixed flow fan is higher than that of an axial flow fan, and the flow coefficient is larger than that of a centrifugal fan. It is used in situations where the wind pressure and flow are "neither too large nor too small". It fills the gap between axial flow fans and centrifugal fans, and has the characteristics of simple and convenient installation.

[0003] Mixed flow fans combine the features of axial and centrifugal fans and look more like traditional axial fans. The casing can have open inlets and outlets, or more commonly, it has a right-angle bend that allows the motor to be placed outside the duct. The discharge casing itself or an external one slowly expands to slow down the air or gas flow and convert kinetic energy into useful static pressure.

[0004] Mixed flow fans are usually installed by hoisting or manual transportation. Mixed flow fans may be installed on the ground or on the ceiling. The installation angle of the mixed flow fan itself needs to be adaptively adjusted according to the actual installation conditions and installation position. However, due to the large size and weight of the mixed flow fan itself, it is not convenient to adjust the installation angle of the mixed flow fan during the actual installation process. Summary of the invention

[0005] In order to improve the situation where the installation angle of the mixed flow fan is inconvenient to adjust, the present application provides a mixed flow fan.

[0006] The present application provides a mixed flow fan, which adopts the following technical solution:

[0007] A mixed flow fan comprises a wind tube housing, wherein a mixed flow blade is coaxially connected to the wind tube housing, and a driving source is also arranged in the wind tube housing, wherein the driving source comprises an externally extending output shaft, and the output shaft of the driving source is coaxially fixed with the mixed flow blade to drive the mixed flow blade to rotate;

[0008] The outer shell of the air duct housing is provided with a limiting ring, the limiting ring is detachably connected to the outside of the air duct housing, a limiting protrusion is provided on the side of the limiting ring away from the air duct housing, a rotating ring is provided on the outer shell of the limiting ring, a limiting groove is provided on the inner side of the rotating ring, the limiting groove matches the shape of the limiting protrusion, and the limiting protrusion slides in the limiting groove;

[0009] A mounting seat is provided on the outer side of the rotating ring, and the mounting seat is used to connect with other components to fix the position of the mixed flow fan. A locking assembly is also provided on the limiting ring, and the locking assembly is used to limit the rotation between the rotating ring and the limiting ring.

[0010] By adopting the above technical scheme, after the mixed flow fan is connected to the air duct, the driving source can be started to drive the mixed flow fan blades to rotate, thereby prompting air to pass through the air duct housing of the mixed flow fan to achieve the purpose of ventilation. The limit ring is detachably connected to the outside of the air duct housing. The rotating ring and the limit ring are connected to each other through the limit protrusions and limit grooves that cooperate with each other and are slidably connected together, so that the rotating ring can rotate relative to the air duct housing, and the mounting seat for fixing the fan is fixed to the rotating ring, so that the mounting seat and the rotating ring can rotate relative to the air duct housing together. During the installation of the mixed flow fan, when it needs to be installed on the ground, the mounting seat can be rotated so that the mounting seat is at the bottom. When it needs to be installed on the ceiling, there is no need to turn the air duct housing being hoisted 180°. It is only necessary to rotate the mounting seat 180° relative to the air duct housing manually or with the help of tools so that the mounting seat is located at the top of the air duct housing, and then the installation can continue. The rotatable mounting seat is convenient for construction personnel to adjust the installation angle and position of the fan, effectively improving work efficiency.

[0011] Optionally, the locking assembly includes a first locking block, a second locking block and a locking piece, one end of the first locking block is fixed to a limiting ring, one end of the second locking block is fixed to an outer side of a rotating ring, and when the positions of the first locking block and the second locking block correspond, the locking piece is simultaneously inserted into the first locking block and the second locking block.

[0012] By adopting the above technical solution, when the rotating ring is rotated to a suitable position, the locking piece can be used to pass through the first locking block and the second locking block at the same time, so that the locking piece limits the rotation of the rotating ring through the first locking block and the second locking block, thereby achieving the function of locking the rotating ring.

[0013] Optionally, a hydraulic telescopic rod is provided on one side of the mounting seat close to the wind cylinder housing, two ends of the hydraulic telescopic rod are hinged to the mounting seat and the wind cylinder housing respectively, and the hydraulic telescopic rod is symmetrically distributed with respect to the rotating ring.

[0014] By adopting the above technical solution, the hydraulic telescopic rod is symmetrically distributed relative to the rotating ring, and the two ends are hinged to the mounting seat and the wind cylinder shell respectively. The length of the hydraulic telescopic rod can be adjusted according to actual conditions. The hydraulic telescopic rod can form a tightening or supporting effect on the two ends of the wind cylinder shell. At the same time, the hydraulic telescopic rod can absorb part of the vibration during the operation of the fan, so that the wind cylinder shell can be more stable and less noisy during operation.

[0015] Optionally, a first elastic member is disposed on the outer sleeve of the hydraulic telescopic rod, and protruding positioning seats are respectively provided at two end positions of the hydraulic telescopic rod, and two ends of the first elastic member are respectively abutted against the two positioning seats.

[0016] By adopting the above technical solution, when the hydraulic telescopic rod absorbs vibration and performs telescopic movement, since the two ends of the first elastic member are respectively against the two positioning seats, the first elastic member can form a support for the hydraulic telescopic rod, and at the same time can further absorb vibration, thereby further improving the stability of the fan operation.

[0017] Optionally, a second elastic member is provided between the hydraulic telescopic rod and the rotating ring, and two ends of the second elastic member are respectively connected to the hydraulic telescopic rod and the rotating ring.

[0018] By adopting the above technical solution, the two ends of the second elastic member are connected to the hydraulic telescopic rod and the rotating ring respectively. When the hydraulic telescopic rod is vibrated, the second elastic member can absorb part of the vibration and also transmit part of the vibration to the mounting seat.

[0019] Optionally, a lubrication hole is formed through the rotating ring in a radial direction, and a lubrication channel surrounding the wind cylinder housing is formed on the inner side surface of the rotating ring in a circumferential direction, and the lubrication channel is connected to the lubrication hole.

[0020] By adopting the above technical solution, due to the sliding friction between the rotating ring and the limiting ring, in order to ensure smooth sliding, lubricating oil can be introduced into the lubrication hole, and the lubricating oil can enter the lubrication channel surrounding the wind cylinder shell through the lubrication hole. Then the lubricating oil can enter the gap between the limiting groove and the limiting protrusion through the lubrication channel, providing lubrication for the friction surface.

[0021] Optionally, a counterweight block is detachably connected to the mounting seat, and the counterweight block is symmetrically distributed relative to the rotating ring.

[0022] By adopting the above technical solution, when the overall weight of the mounting base is relatively light, it may cause large vibrations during the operation of the fan. In severe cases, it may even cause the fan to jump slightly. At this time, a counterweight block can be installed on the mounting base to increase the mass of the mounting base so that the mounting base can support the fan more stably.

[0023] Optionally, the mixed flow blade is a three-dimensional twisted blade with a front disk arc, a hyperbolic wind guide cap is coaxially fixed to the end of the mixed flow blade away from the driving source, and a Venturi type air inlet is provided at the end of the wind cylinder housing close to the mixed flow blade.

[0024] By adopting the above technical scheme, the mixed flow fan blade can be a high-efficiency blade profile with a front disk arc three-dimensional twisting designed by digital design and simulation, so that when the mixed flow fan blade rotates, the leakage in the blade flow channel can be effectively reduced, and the flow loss is small, thereby improving the working efficiency of the impeller; at the same time, the air inlet can also be a spin-formed Venturi-type air inlet, and a hyperbolic air guide cap is coaxially fixed at one end of the mixed flow fan blade close to the air inlet, so that the incoming air enters the mixed flow fan along the Venturi-type air inlet, the hyperbolic air guide cap and the mixed flow fan blade, forming an air inlet low-resistance flow channel, which can effectively improve the efficiency of the fan.

[0025] Optionally, the external coaxial cover of the driving source is provided with an inner cylinder, a gap is left between the wind cylinder shell and the inner cylinder, and the outer diameter of the inner cylinder away from the mixed flow fan blade end gradually shrinks along the axial direction of the wind cylinder shell.

[0026] By adopting the above technical solution, a gap is left between the air cylinder shell and the inner cylinder to form an air duct, and the outer diameter of the inner cylinder gradually shrinks at the end away from the mixed flow blades, so that a diffuser is formed between the inner cylinder and the air cylinder shell, and the air duct is connected to the rear diffuser to form a low-resistance flow channel, which can further improve the efficiency of the fan. By strictly controlling the installation gap between the mixed flow blades and the Venturi air inlet, as well as the installation gap of the guide port, the leakage of the mixed flow fan can be greatly reduced.

[0027] In summary, the present application includes at least one of the following beneficial effects:

[0028] 1. By arranging a limit ring and a rotating ring that can rotate with each other outside the wind tube housing, and arranging a mounting seat on the rotating ring, when the installation angle of the fan needs to be adjusted, the installation angle can be adjusted by manually rotating the mounting seat, which is convenient for construction personnel to operate;

[0029] 2. By providing interconnected lubrication holes and lubrication channels on the rotating ring, lubrication oil can be introduced into the friction surface between the rotating ring and the limit ring through the lubrication holes in the later stage, thereby improving the smoothness of the rotation of the rotating ring;

[0030] 3. By arranging a hydraulic telescopic rod on the mounting seat and sleeved with a first elastic member on the hydraulic telescopic rod, the hydraulic telescopic rod can provide lateral support for the fan and further absorb the vibration generated by the operation of the fan, thereby improving the stability of the fan operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram showing the structure of the outer tube of the mixed flow fan in an embodiment of the present application;

[0032] Figure 2 yes Figure 1 An enlarged schematic diagram at A;

[0033] Figure 3This is a schematic diagram showing the internal structure of a mixed flow fan in an embodiment of the present application;

[0034] Figure 4 yes Figure 3 Enlarged schematic at B.

[0035] Explanation of the accompanying drawings: 1. Air cylinder housing; 11. Air inlet; 12. Air outlet; 13. Mixed flow fan blade; 14. Lifting ear; 15. Driving source; 2. Mounting seat; 21. Counterweight block; 22. Hydraulic telescopic rod; 221. First elastic member; 222. Positioning seat; 3. Limiting ring; 31. First locking block; 32. Limiting protrusion; 4. Rotating ring; 41. Second locking block; 42. Limiting groove; 43. Lubrication hole; 44. Lubrication channel; 5. Connecting block; 6. Buffer layer; 7. Second elastic member; 8. Locking member. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 This application is described in further detail.

[0037] The present application embodiment discloses a mixed flow fan, referring to Figure 1 The mixed flow fan includes a wind tube housing 1 and a mounting base 2, wherein the wind tube housing 1 is in a hollow cylindrical shape as a whole, the opening at one end of the wind tube housing 1 is an air inlet 11, and the other end is an air outlet 12, and the wind tube housing 1 is coaxially connected with mixed flow blades 13, and the mixed flow blades 13 are distributed in the wind tube housing 1 near the air inlet 11. Both ends of the mixed flow fan can be connected to the ventilation duct externally, and when the mixed flow blades 13 rotate, the air in the ventilation duct can be quickly discharged from one end of the air inlet 11 to one end of the air outlet 12, so as to realize the function of ventilation. A lifting ear 14 is also fixed to the outer wall of the side of the wind tube housing 1, and the number of the lifting ears 14 can be set according to actual conditions, and the wind tube housing 1 can be hoisted by the lifting ears 14. In other embodiments of the present application, the mixed flow blade 13 can be a high-efficiency blade profile with an arc-shaped three-dimensional twisted front disk designed by digital design and simulation, so that when the mixed flow blade 13 rotates, the leakage in the blade flow channel can be effectively reduced, and the flow loss is small, thereby improving the working efficiency of the impeller; at the same time, the air inlet 11 can also be a spun-formed Venturi air inlet, and a hyperbolic air guide cap is coaxially fixed to one end of the mixed flow blade 13 close to the air inlet 11, and the impeller front disk of the mixed flow blade 13 is also spun-formed and connected to the Venturi-type air inlet 11, so that the intake air enters the interior of the mixed flow fan along the Venturi-type air inlet 11, The hyperbolic air guide cap and the mixed flow blade 13, forming an air intake low-resistance flow channel, which can effectively improve the efficiency of the fan.

[0038] In the embodiment of the present application, a layer of fireproof coating can be applied on the outer wall and inner wall surface of the wind duct housing 1. The fireproof coating can be formed by brushing thick steel structure fireproof coating. The fireproof coating can effectively improve the fireproof performance of the fan, reduce the occurrence of fire during the operation of the fan, and improve the safety of the fan operation. In other embodiments of the present application, a fireproof coating can be applied on the mixed flow blades 13 and the mounting seat 2. Sound-absorbing material can also be filled inside the wind duct housing 1. The sound-absorbing material can be lightweight sound-absorbing cotton. The fan may generate loud noise when running. The sound-absorbing material filled inside the wind duct housing 1 can effectively absorb the noise generated by the fan and reduce the impact of the fan noise on the surrounding environment.

[0039] Reference Figure 1 The outer shell of the wind cylinder 1 is provided with a limit ring 3, which is detachably connected to the middle position outside the wind cylinder shell 1. The detachable connection method can be bolt connection or clamping. In this embodiment, the limit ring 3 is fixed to the wind cylinder shell 1 by fastening bolts. A rotating ring 4 is sleeved and rotatably connected to the outer side of the limit ring 3. The rotating ring 4 can rotate relative to the limit ring 3, that is, it can rotate relative to the wind cylinder shell 1. The mounting seat 2 is arranged on the outer side of the rotating ring 4 away from the wind cylinder shell 1, so that the mounting seat 2 can also rotate relative to the wind cylinder shell 1 together with the rotating ring 4.

[0040] Use a hoisting tool to hoist the mixed flow fan. When the mixed flow fan needs to be installed on the ground, the mounting seat 2 can be rotated to the bottom, and the mounting seat 2 rotates together with the rotating ring 4. When the mixed flow fan needs to be installed on the ceiling, keep the hoisting posture of the mixed flow fan unchanged, and continue to install by applying external force to rotate the mounting seat 2 to the top. There is no need to turn the wind tube housing 1 being hoisted 180° as a whole. The rotatable mounting seat 2 is convenient for construction workers to adjust the installation angle and position of the fan, effectively improving work efficiency. Similarly, if the mixed flow fan needs to be installed on the side wall of the building, it can be installed by applying external force to rotate the mounting seat 2 to the side position.

[0041] Reference Figure 1 A connecting block 5 and a buffer layer 6 are also provided between the mounting seat 2 and the rotating ring 4, wherein the connecting block 5 can be integrally formed with the rotating ring 4, or combined into a whole by welding, and the buffer layer 6 is fixed between the connecting block 5 and the mounting seat 2, and the buffer layer 6 can be made of polyethylene foam plastic, or a plate formed by a blend of plasticized polyvinyl chloride, etc., so that the buffer layer 6 can effectively absorb the vibration generated by the mixed flow fan during operation, thereby improving the stability of the operation of the mixed flow fan.

[0042] A counterweight 21 is detachably connected to one side surface of the mounting seat 2 close to the wind tube housing 1. The detachable manner may be bolt connection, so that the counterweight 21 can be fixed on the mounting seat 2, and the counterweight 21 is symmetrically distributed relative to the rotating ring 4. When the overall weight of the mounting seat 2 is relatively light, it may cause large vibrations during the operation of the fan, and in severe cases may even cause the fan to slightly jump. At this time, the counterweight 21 can be installed on the mounting seat 2 to increase the mass of the mounting seat 2, so that the mounting seat 2 can support the fan more stably. In other embodiments of the present application, the number of counterweights 21 can be increased according to actual conditions to make the mixed flow fan run more stably.

[0043] Reference Figure 1 and Figure 2 , a first locking block 31 extending outward is fixed on the outer side of the limit ring 3, and a second locking block 41 is fixed on the outer side of the rotating ring 4. The first locking block 31 and the second locking block 41 are both provided with locking holes. When the rotating mounting seat 2 is rotated to a suitable position, the wind tube housing 1 can be rotated so that the first locking block 31 corresponds to the position of the first locking block 31. At this time, the first locking block 31 corresponds to the locking holes on the second locking block 41. A locking member 8 can be inserted into the locking hole. The locking member 8 can be a locking screw. After the locking member 8 is inserted into the locking hole, the locking member 8 can be matched and fastened with a nut, so that the locking member 8 limits the rotation of the rotating ring 4 through the first locking block 31 and the second locking block 41, thereby achieving the function of locking the mounting seat 2. In other embodiments of the present application, the number of the first locking block 31 and the second locking block 41 can be increased according to actual conditions, so that the position of the rotating ring 4 between the limit ring 3 is locked more firmly.

[0044] Two hydraulic telescopic rods 22 are arranged on one side of the mounting seat 2 close to the air cylinder housing 1. The hydraulic telescopic rods 22 can be placed vertically or tilted. The hydraulic telescopic rod 22 includes two parts that can be telescoped, so that the length of the hydraulic telescopic rod 22 can be changed, and the two ends of the hydraulic telescopic rod 22 are respectively hinged to the mounting seat 2 and the air cylinder housing 1, and the two hydraulic telescopic rods 22 are symmetrically distributed relative to the rotating ring 4. The hydraulic telescopic rod 22 is respectively fixed with protruding positioning seats 222 at positions close to the two ends, and a first elastic member 221 is arranged between the two positioning seats 222. The first elastic member 221 can be a compression spring or a tension spring, and the two ends of the first elastic member 221 are respectively against the two positioning seats 222. The hydraulic telescopic rod 22 can form a tightening or supporting effect on the two ends of the wind cylinder shell 1. When the mixed flow fan is running and generates vibration, the hydraulic telescopic rod 22 can absorb part of the vibration of the fan during operation by stretching or compressing its own length; at the same time, when the hydraulic telescopic rod 22 absorbs the vibration and performs telescopic movement, it will compress or stretch the first elastic member 221. The first elastic member 221 can store elastic potential energy through deformation, which can further absorb vibration, further improve the stability of the fan operation, and make the wind cylinder shell 1 more stable and less noisy during operation.

[0045] At the same time, a second elastic member 7 is also provided between the hydraulic telescopic rod 22 and the rotating ring 4. The second elastic member 7 can also be a compression spring or a tension spring. The two ends of the second elastic member 7 are respectively fixed to the hydraulic telescopic rod 22 and the connecting block 5. In other embodiments of the present application, the second elastic member 7 can also be directly fixed to the rotating ring 4. When the hydraulic telescopic rod 22 is vibrated, the second elastic member 7 can absorb part of the vibration of the hydraulic telescopic rod 22, and can also transfer part of the vibration to the connecting block 5, further improving the stability of the mixed flow fan operation.

[0046] Reference Figure 3 and Figure 4 , a driving source 15 is also fixed in the air cylinder housing 1 through a fixed bracket, and the driving source 15 can be a servo motor. The driving source 15 includes an outwardly extending output shaft, and the output shaft of the driving source 15 is coaxially fixed with the mixed flow blade 13 to drive the mixed flow blade 13 to rotate. In other embodiments of the present application, an inner cylinder can also be coaxially covered outside the driving source 15, and an air duct is formed between the air cylinder housing 1 and the inner cylinder, and the inner diameter of the air cylinder housing 1 at the end of the corresponding inner cylinder close to the mixed flow blade 13 gradually shrinks, so that a guide port is formed between the air cylinder housing 1 and the inner cylinder, and at the same time, along the axis direction of the air cylinder housing 1, the outer diameter of the inner cylinder at the end away from the mixed flow blade 13 gradually shrinks, so that a diffuser is formed between the inner cylinder and the air cylinder housing 1, and a low-resistance flow channel is formed between the guide port and the tail diffuser, which can further improve the efficiency of the fan, and by strictly controlling the installation gap between the mixed flow blade 13 and the Venturi air inlet, and the installation gap of the guide port, the leakage of the mixed flow fan is greatly reduced.

[0047] The side of the limiting ring 3 away from the wind tube housing 1 is integrally formed with a limiting protrusion 32, the outer side of the limiting protrusion 32 is an arc surface, and protrudes outward at both ends along the axial direction of the wind tube housing 1, and the inner side of the rotating ring 4 is provided with a limiting groove 42 matching the shape of the limiting protrusion 32, the outward protruding part of the limiting protrusion 32 is snapped into the limiting groove 42, and the limiting protrusion 32 slides as a whole in the limiting groove 42, so that the rotating ring 4 can rotate relative to the limiting ring 3 without falling off. In other embodiments of the present application, the outer side of the limiting protrusion 32 can also be a plane.

[0048] The rotating ring 4 is provided with a lubrication hole 43 in the radial direction. There are multiple lubrication holes 43 and they are distributed circumferentially along the rotating ring 4. At the same time, the inner side surface of the rotating ring 4 is provided with a lubrication channel 44 surrounding the air cylinder housing 1 in the circumferential direction. The lubrication channel 44 is connected to the lubrication hole 43. Since there is sliding friction between the rotating ring 4 and the limiting ring 3, in order to slide smoothly, lubricating oil can be introduced into the friction gap between the limiting ring 3 and the rotating ring 4 through the lubrication hole 43. The lubricating oil can enter the lubrication channel 44 surrounding the air cylinder housing 1 along the lubrication hole 43, and then the lubricating oil can enter the gap between the limiting groove 42 and the limiting protrusion 32 through the lubrication channel 44 to provide lubrication for the friction surface. When the lubrication hole 43 is not used, the lubrication hole 43 can be blocked with an oil plug of corresponding size.

[0049] The implementation principle of a mixed flow fan in an embodiment of the present application is as follows: the rotating ring 4 can rotate relative to the limiting ring 3, and the mounting seat 2 can rotate together with the rotating ring 4, so that when the installation angle of the fan needs to be adjusted, the installation angle can be adjusted by manually rotating the mounting seat 2, which is convenient for construction personnel to operate; at the same time, the hydraulic telescopic rod 22 and the buffer layer 6 can effectively absorb the vibration generated by the mixed flow fan during operation, thereby improving the stability of the mixed flow fan operation.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A mixed flow fan, characterized in that: The fan comprises a fan housing (1), wherein a mixed flow blade (13) is coaxially rotatably connected inside the fan housing (1), and a driving source (15) is also arranged inside the fan housing (1), wherein the driving source (15) comprises an externally extending output shaft, and the output shaft of the driving source (15) is coaxially fixed to the mixed flow blade (13) to drive the mixed flow blade (13) to rotate; The outer shell of the wind tube housing (1) is provided with a limiting ring (3), the limiting ring (3) is detachably connected to the outside of the wind tube housing (1), a limiting protrusion (32) is provided on the side of the limiting ring (3) away from the wind tube housing (1), the outer shell of the limiting ring (3) is provided with a rotating ring (4), the inner side surface of the rotating ring (4) is provided with a limiting groove (42), the limiting groove (42) matches the shape of the limiting protrusion (32), and the limiting protrusion (32) slides in the limiting groove (42); The outer side surface of the rotating ring (4) is provided with a mounting seat (2), and the mounting seat (2) is used to connect with other components to fix the position of the mixed flow fan. The limiting ring (3) is also provided with a locking assembly, and the locking assembly is used to limit the rotation between the rotating ring (4) and the limiting ring (3).

2. A mixed flow fan according to claim 1, characterized in that: The locking assembly comprises a first locking block (31), a second locking block (41) and a locking piece (8); one end of the first locking block (31) is fixed to the limiting ring (3); one end of the second locking block (41) is fixed to the outer side of the rotating ring (4); when the first locking block (31) and the second locking block (41) are positioned correspondingly, the locking piece (8) is simultaneously inserted into the first locking block (31) and the second locking block (41).

3. A mixed flow fan according to claim 1, characterized in that: A hydraulic telescopic rod (22) is provided on one side of the mounting seat (2) close to the wind cylinder housing (1); two ends of the hydraulic telescopic rod (22) are respectively hinged to the mounting seat (2) and the wind cylinder housing (1); and the hydraulic telescopic rod (22) is symmetrically distributed relative to the rotating ring (4).

4. A mixed flow fan according to claim 3, characterized in that: The outer sleeve of the hydraulic telescopic rod (22) is provided with a first elastic member (221), and the hydraulic telescopic rod (22) is provided with protruding positioning seats (222) at both end positions, and both ends of the first elastic member (221) are respectively abutted against the two positioning seats (222).

5. A mixed flow fan according to claim 4, characterized in that: A second elastic member (7) is provided between the hydraulic telescopic rod (22) and the rotating ring (4), and two ends of the second elastic member (7) are respectively connected to the hydraulic telescopic rod (22) and the rotating ring (4).

6. A mixed flow fan according to claim 1, characterized in that: The rotating ring (4) is provided with a lubrication hole (43) penetrating in the radial direction, and the inner side surface of the rotating ring (4) is provided with a lubrication channel (44) surrounding the wind tube housing (1) in the circumferential direction, and the lubrication channel (44) is connected to the lubrication hole (43).

7. A mixed flow fan according to claim 1, characterized in that: A counterweight block (21) is detachably connected to the mounting seat (2), and the counterweight block (21) is symmetrically distributed relative to the rotating ring (4).

8. The mixed flow fan according to claim 1, characterized in that: The mixed flow blade (13) is a three-dimensional twisted blade with a front disc arc, a hyperbolic air guide cap is coaxially fixed to one end of the mixed flow blade (13) away from the driving source (15), and a Venturi-type air inlet is provided on the end of the wind cylinder housing (1) close to the mixed flow blade (13).

9. The mixed flow fan according to claim 1, characterized in that: The driving source (15) is coaxially covered externally with an inner cylinder, a gap is left between the wind cylinder shell (1) and the inner cylinder, and the outer diameter of the inner cylinder gradually shrinks at one end away from the mixed flow blade (13) along the axis of the wind cylinder shell (1).

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