Volute-free centrifugal fan with flow deflectors and flow slowing devices

Abstract

The invention discloses a volute-free centrifugal fan with a flow deflector and a flow slowing device, and relates to the technical field of centrifugal fans, the volute-free centrifugal fan comprises a rack and a motor arranged on the rack, the output end of the motor is fixedly connected with a chassis, and the side, away from the motor, of the chassis is fixedly connected with a plurality of blades; a top disc is fixedly connected to the side, away from the base disc, of each blade, the side flow deflectors are arranged on the sides, close to each other, of the blades, the side flow deflectors are arranged at equal intervals, and a plurality of upper flow deflectors are fixedly connected to the side, close to the base disc, of the top disc. According to the volute-free centrifugal fan with the flow deflectors and the flow slowing device, by means of the arrangement of the side flow deflectors, the upper flow deflectors and the flow slowing columns, the aerodynamic efficiency of the fan is improved, and meanwhile under the cooperation effect of the connecting assembly, the driving assembly, the pushing assembly and the moving assembly, the angle of the side flow deflectors can be conveniently and automatically adjusted according to the rotating speed of the fan.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal fan, in particular to a volute-free centrifugal fan with guide vanes and flow reducer. BACKGROUND

[0002] The volute-free centrifugal fan is a special type of centrifugal fan, which omits the volute structure of the traditional centrifugal fan and is widely used in industrial, commercial and civil fields. Like the traditional centrifugal fan, the volute-free centrifugal fan relies on the high-speed rotation of the impeller to generate centrifugal force. When the impeller rotates, air is sucked in and obtains centrifugal force, is thrown to the periphery of the impeller along the blade channel, and is then discharged from the air outlet. Unlike the traditional centrifugal fan, the volute-free centrifugal fan does not have a volute to collect, guide and pressurize the airflow, but directly discharges the airflow. Some volute-free centrifugal fans are equipped with simple diffuser devices (such as diffuser pipes) to improve the static pressure of the airflow.

[0003] In the impeller of the volute-free centrifugal fan, the pressure at the suction surface of the blade is lower than the pressure at the pressure surface of the adjacent blade. This pressure difference and velocity difference cause the flowing gas to be subjected to a force directed towards the suction surface of the blade. The fluid element velocity at the near-wall surface of the impeller is lower than the main flow zone velocity, so the centrifugal force and Coriolis force cannot effectively balance the pressure difference, resulting in the formation of secondary flow perpendicular to the main flow direction within the boundary layer. This causes the low-energy fluid to transfer from the pressure surface to the suction surface. The pressure difference between the front disc and the rear disc in the meridian plane also causes the low-energy fluid in the boundary layer to transfer to the front disc surface, causing the boundary layer near the front disc near-wall surface of the suction surface to separate. At the same time, due to the small degree of fluid clamping between the main blades, the fluid flow on the axial surface generates a velocity slip due to the effect of inertial force, forming an axial vortex, which further enhances the development of the boundary layer separation flow at the front disc suction surface. Secondary flow and boundary layer separation flow seriously affect the stability of the gas flow in the flow passage, causing the generation of a low-speed turbulent zone near the front disc suction surface, resulting in the "jet-wake" phenomenon of the impeller outlet velocity being extremely uneven. The stronger the "jet-wake" structure, the lower the efficiency of the impeller. These flow losses caused by boundary layer separation, secondary flow and "jet-wake" are the main reasons for reducing the efficiency of the centrifugal fan.

[0004] In the prior art, a volute-free centrifugal fan with guide vanes and a flow reducer is disclosed in CN117249111A. The volute-free centrifugal fan with guide vanes and a flow reducer reduces the impact of the inlet flow of the impeller and suppresses the generation of complex flow inside the fan, reduces flow loss, and improves the operating efficiency of the fan and the operating stability when used in parallel. However, the above-mentioned volute-free centrifugal fan with guide vanes and a flow reducer is difficult to adapt to the airflow characteristics at different speeds, thereby reducing the weakening or suppression of the "jet-wake" phenomenon.

[0005] To this end, we propose a volute-free centrifugal fan with guide vanes and flow reducer. SUMMARY

[0006] The present application aims to provide a volute-free centrifugal fan with guide vanes and flow reducer to solve the problems raised in the background art.

[0007] To achieve the above object, the present application provides the following technical solutions: a volute-free centrifugal fan with guide vanes and flow reducer, comprising a rack and a motor arranged on the rack, the output end of the motor is fixedly connected with a bottom disc, the side of the bottom disc away from the motor is fixedly connected with a plurality of blades, the side of each blade away from the bottom disc is fixedly connected with a top disc, further comprising a plurality of side guide vanes arranged on the side of each blade close to each other, the side guide vanes are equidistantly arranged, the side guide vanes are connected with the blades through a connecting assembly, the side of the top disc close to the bottom disc is fixedly connected with a plurality of upper guide vanes, each blade is provided with a driving assembly for driving each side guide vane, and further comprising a flow reduction column arranged on the side of the bottom disc close to the top disc, the flow reduction column is arranged in a conical shape, and the side wall is provided with an arc surface.

[0008] Preferably, the connecting assembly comprises two symmetrically arranged mounting plates fixedly connected to the side of the blade close to the flow reduction column, the connecting plates are connected through a connecting shaft, one side of the side guide vanes is connected with the connecting plates, and the blade is provided with a driving assembly for driving the connecting plates.

[0009] Preferably, the driving assembly comprises two symmetrically arranged first fixed plates fixedly connected to the side of the blade close to the connecting plate, the side of the two first fixed plates is fixedly connected with a first T-shaped rod, the side wall of the two first T-shaped rods is slidingly connected with a sliding plate, the side of the two sliding plates close to the mounting plate is fixedly connected with a long strip plate, the side of the long strip plate close to the connecting plate is rotatably connected with a plurality of driving rods, the side of each driving rod away from the long strip plate is fixedly connected with a first gear, and each first gear is connected with the connecting shaft through a stroke amplification assembly.

[0010] Preferably, the stroke amplification assembly comprises a second fixed plate fixedly connected to the side of the mounting plate close to the long strip plate, the second fixed plate is slidingly connected with two symmetrically arranged second T-shaped rods, the two second T-shaped rods are connected through a fixed block, the first rack is meshingly arranged with the first gear, the end of the second fixed plate away from the blade is fixedly connected with a second rack through an L-shaped support, the second rack is meshingly arranged with the first gear, the end of the connecting shaft close to the long strip plate is fixedly connected with a second gear, the second gear is meshingly arranged with the first rack, and the flow reduction column is provided with a pushing assembly for pushing the first gear.

[0011] Preferably, the pushing assembly comprises a hollow cavity provided in the slow-flowing column, a pushing pipe fixedly connected to the inner wall of one side of the hollow cavity close to the bottom disc, a connecting pipe fixedly connected to the side wall of the pushing pipe, one end of the connecting pipe away from the pushing pipe penetrates through the slow-flowing column and is located at one end of the long strip plate, a pushing rod slidingly connected to one end of the pushing pipe close to the long strip plate, one end of the pushing rod connected to the long strip plate, one end of the pushing rod away from the long strip plate located in the connecting pipe and fixedly connected to a pushing plate, and the pushing pipe is provided with a squeezing assembly for squeezing the pushing plate.

[0012] Preferably, the squeezing assembly comprises a squeezing plate slidingly connected to the pushing pipe, the pushing pipe is provided with a guide assembly for guiding the movement of the squeezing plate, the squeezing plate is fixedly connected to a squeezing rod away from one side of the bottom disc, the hollow cavity is provided with a moving assembly for moving the squeezing rod, the squeezing plate is fixedly connected to a first spring away from one side of the squeezing rod, and one end of the first spring away from the squeezing plate is connected to the bottom wall of the pushing pipe.

[0013] Preferably, the guide assembly comprises a spline rod fixedly connected to the bottom wall of the pushing pipe, and the squeezing plate and the squeezing rod are both provided with spline holes matched with the spline rod.

[0014] Preferably, the moving assembly comprises a mounting rod fixedly connected to the inner wall of one side of the hollow cavity away from the bottom disc, a fixing ring fixedly connected to one end of the mounting rod close to the pushing pipe, a plurality of semicircular sleeves arranged in an annular array slidingly connected to the circumferential side of the fixing ring, a rotating ball rotationally connected to each semicircular sleeve, the fixing ring is provided with a telescopic assembly for telescoping each rotating ball, a conical sleeve slidingly connected to the circumferential side of the fixing ring, and each rotating ball is located in the conical sleeve.

[0015] Preferably, the large end of the conical sleeve close to the bottom disc is connected to the squeezing rod through a conical shell.

[0016] Preferably, the telescopic assembly comprises a telescopic tube fixedly connected to the side wall of the fixing ring, a telescopic rod slidingly connected to the telescopic tube, one end of the telescopic rod connected to the semicircular sleeve, one end of the telescopic rod away from the semicircular sleeve located in the telescopic tube and fixedly connected to a telescopic plate, a second spring sleeved on the side wall of the telescopic rod, and two ends of the second spring connected to the telescopic plate and the inner wall of the telescopic tube, respectively.

[0017] Compared with the prior art, the present application has the following beneficial effects: The volute-free centrifugal fan with a guide vane and a flow reducer of the application utilizes the setting of the side guide vane, the upper guide vane and the flow column to improve the flow characteristics inside the impeller, reduce the flow loss of the fan, improve the aerodynamic efficiency of the fan, and utilize the cooperation of the connecting assembly, the driving assembly, the pushing assembly and the moving assembly to automatically adjust the angle of the side guide vane according to the rotating speed of the fan, so that the side guide vane can dynamically adapt to the airflow characteristics under different rotating speeds, and further weaken the "jet - trail" phenomenon. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the application; Figure 2 It is a schematic diagram of the structure of the side guide vane and the flow column of the application; Figure 3 It is a schematic diagram of the positional relationship between the upper guide vane and the top disc of the application; Figure 4 It is a schematic diagram of the positional relationship between the side guide vane and the blade of the application; Figure 5 It is a schematic diagram of the structure of the connecting assembly and the driving assembly of the application; Figure 6 It is a schematic diagram of the positional relationship between the pushing assembly and the moving assembly of the application; Figure 7 It is a schematic diagram of the structure of the guide of the application; Figure 8 It is a schematic diagram of the structure of the moving assembly of the application; Figure 9 It is Figure 5 the enlarged view of A in the figure; Figure 10 It is Figure 9 the enlarged view of B in the figure.

[0019] In the figure: 101, rack; 102, motor; 103, bottom disc; 104, blade; 105, top disc; 201, side guide vane; 202, upper guide vane; 301, slow flow column; 302, arc surface; 401, mounting plate; 402, connecting shaft; 403, connecting plate; 501, first fixed plate; 502, first T-shaped rod; 503, sliding plate; 504, long strip plate; 505, driving rod; 506, first gear; 601, second fixed plate; 602, second T-shaped rod; 603, first rack; 604, second rack; 605, second gear; 701, hollow cavity; 702, push pipe; 703, connecting pipe; 704, push plate; 705, push rod; 801, extrusion plate; 802, extrusion rod; 803, first spring; 901, mounting rod; 902, fixed ring; 903, semicircular sleeve; 904, rotating ball; 905, conical sleeve; 1001, telescopic pipe; 1002, telescopic rod; 1003, telescopic plate; 1004, second spring; 1101, spline rod; 1102, spline hole. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0021] Embodiment 1 Please refer to Figures 1-10 , a volute-free centrifugal fan with guide vanes and slow flow devices in the figure, comprising a rack 101 and a motor 102 arranged on the rack 101, the output end of the motor 102 is fixedly connected with a bottom disc 103, the side away from the motor 102 of the bottom disc 103 is fixedly connected with a plurality of blades 104, the side away from the bottom disc 103 of each blade 104 is fixedly connected with a top disc 105, further comprising a plurality of side guide vanes 201 arranged on the side of each blade 104 close to each other, the side guide vanes 201 are equidistantly arranged, the side guide vanes 201 are connected with the blades 104 through a connecting assembly, the side close to the bottom disc 103 of the top disc 105 is fixedly connected with a plurality of upper guide vanes 202, each blade 104 is provided with a driving assembly for driving each side guide vane 201, and further comprising a slow flow column 301 arranged on the side of the bottom disc 103 close to the top disc 105, the slow flow column 301 is arranged in a conical shape, and the side wall is provided with an arc surface 302; It should be noted here that: the arrangement of the side guide vanes 201, the upper guide vanes 202 and the slow flow column 301 improves the flow characteristics inside the impeller, reduces the flow loss of the fan, and improves the aerodynamic efficiency of the fan.

[0022] Please refer to Figure 4 and Figure 5 , the connecting assembly in the figure includes two mutually symmetrical installation plates 401 fixedly connected to the vane 104 on the side close to the slow flow column 301, and a connecting plate 403 connected between the two installation plates 401 through a connecting shaft 402, one side of the side guide vane 201 is connected with the connecting plate 403, and the vane 104 is provided with a driving assembly for driving the connecting plate 403; It should be noted here that: through the setting of the connecting assembly, the side guide vane 201 and the vane 104 are hinged, thereby providing the feasibility of operation for the angle adjustment of the side guide vane 201.

[0023] Please refer to Figure 5 and Figure 9 , the driving assembly in the figure includes two mutually symmetrical first fixed plates 501 fixedly connected to the vane 104 on the side close to the connecting plate 403, and a first T-shaped rod 502 fixedly connected to one side of the two first fixed plates 501, a sliding plate 503 slidingly connected to the side wall of the two first T-shaped rods 502, a long strip plate 504 fixedly connected to one side of the two sliding plates 503 close to the installation plate 401, a plurality of driving rods 505 rotatably connected to one side of the long strip plate 504 close to the connecting plate 403, a first gear 506 fixedly connected to one side of each driving rod 505 away from the long strip plate 504, and each first gear 506 connected with the connecting shaft 402 through a stroke amplification assembly; It should be noted here that: through the setting of the driving assembly, the connecting plate 403 is conveniently driven to rotate.

[0024] Please refer to Figure 5 and Figure 10 , the stroke amplification assembly in the figure includes a second fixed plate 601 fixedly connected to the installation plate 401 on the side close to the long strip plate 504, two mutually symmetrical second T-shaped rods 602 slidingly connected to the second fixed plate 601, a first rack 603 connected between the two second T-shaped rods 602 through a fixed block, the first rack 603 is meshingly arranged with the first gear 506, a second rack 604 fixedly connected to one end of the second fixed plate 601 away from the vane 104 through an L-shaped support, the second rack 604 is meshingly arranged with the first gear 506, a second gear 605 fixedly connected to one end of the connecting shaft 402 close to the long strip plate 504, the second gear 605 is meshingly arranged with the first rack 603, and the slow flow column 301 is provided with a pushing assembly for pushing the first gear 506; It should be noted here that: through the setting of the stroke amplification assembly, the sensitivity of the angle adjustment of the side guide vane 201 is improved.

[0025] Please refer to Figure 5 and Figure 6The pushing assembly in the drawing comprises a hollow cavity 701 formed in the slow-flowing column 301, the hollow cavity 701 is fixedly connected with a pushing pipe 702 close to the inner wall of one side of the base plate 103, the pushing pipe 702 is fixedly connected with a connecting pipe 703, one end of the connecting pipe 703 away from the pushing pipe 702 penetrates through the slow-flowing column 301 and is located at one end of the long strip plate 504, the pushing pipe 702 is slidably connected with a pushing rod 705 close to one end of the long strip plate 504, one end of the pushing rod 705 is connected with the long strip plate 504, the pushing rod 705 away from the long strip plate 504 is located in the connecting pipe 703 and is fixedly connected with a pushing plate 704, and the pushing pipe 702 is provided with a squeezing assembly for squeezing the pushing plate 704; It should be noted that: through the setting of the pushing assembly, the driving rod 505 is facilitated to move.

[0026] Please refer to Figure 6 and Figure 7 The squeezing assembly in the drawing comprises a squeezing plate 801 slidably connected in the pushing pipe 702, the pushing pipe 702 is provided with a guide assembly for guiding the movement of the squeezing plate 801, the squeezing plate 801 is fixedly connected with a squeezing rod 802 away from one side of the base plate 103, the hollow cavity 701 is provided with a moving assembly for moving the squeezing rod 802, the squeezing plate 801 is fixedly connected with a first spring 803 away from one side of the squeezing rod 802, and one end of the first spring 803 away from the squeezing plate 801 is connected with the bottom wall of the pushing pipe 702; It should be noted that: through the setting of the squeezing assembly, the gas in the pushing pipe 702 is facilitated to be squeezed and extracted.

[0027] Please refer to Figure 6 and Figure 7 The guide assembly in the drawing comprises a spline rod 1101 fixedly connected with the bottom wall of the pushing pipe 702, and the squeezing plate 801 and the squeezing rod 802 are both provided with spline holes 1102 matched with the spline rod 1101; It should be noted that: through the setting of the guide assembly, the movement of the squeezing plate 801 is guided and limited.

[0028] Please refer to Figure 6 and Figure 8The moving assembly in the drawing comprises a mounting rod 901 fixedly connected to the inner wall of the hollow cavity 701 away from the chassis 103, a fixing ring 902 fixedly connected to one end of the mounting rod 901 close to the push pipe 702, a plurality of semicircular sleeves 903 arranged in an annular array and slidingly connected to the circumferential side of the fixing ring 902, a rotating ball 904 rotationally connected to each semicircular sleeve 903, an extension assembly provided on the fixing ring 902 for extending and retracting each rotating ball 904, a conical sleeve 905 slidingly connected to the circumferential side of the fixing ring 902, and each rotating ball 904 located in the conical sleeve 905, wherein the large end of the conical sleeve 905 is close to the chassis 103 and is connected to the extrusion rod 802 through a conical shell. It should be noted that the moving assembly is arranged to facilitate the movement of the extrusion plate 801 by the rotating speed of the fan.

[0029] Please refer to Figure 6 and Figure 8 The extension assembly in the drawing comprises an extension pipe 1001 fixedly connected to the side wall of the fixing ring 902, an extension rod 1002 slidingly connected to the extension pipe 1001, one end of the extension rod 1002 connected to the semicircular sleeve 903, the other end of the extension rod 1002 located in the extension pipe 1001 and fixedly connected to an extension plate 1003, a second spring 1004 sleeved on the side wall of the extension rod 1002, and two ends of the second spring 1004 connected to the extension plate 1003 and the inner wall of the extension pipe 1001 respectively. It should be noted that the extension assembly is arranged to provide guidance and elastic return for the movement of the rotating ball 904.

[0030] Working principle: during the rotation of the motor 102 and the chassis 103, the slow-flow column 301 is rotated synchronously with the rotation of each blade 104. At this time, the high-speed rotating blades 104 suck in and accelerate the gas flow. When the blades 104 are in operation, a low-pressure area is generated at the inlet of the impeller, causing the gas to flow from the gas inlet of the top disc 105. After the action of the top disc 105, the bottom disc 103 and the slow-flow column 301, the gas flow direction is changed from axial to radial, so that the gas enters the flow passage between every two blades 104. The blades 104 and the upper guide vane 202 work on the fluid, and the side guide vane 201 and the upper guide vane 202 guide the gas flow out of the impeller to complete the through-flow function. The air flow from the impeller inlet enters the top disc 105 and flows to the bottom disc 103. When the air flow reaches the bottom disc 103, the arc surface 302 of the slow flow column 301 hinders the air flow, thereby better transitioning the axial air flow at the impeller inlet to radial air flow, thereby reducing the direct impact of the air flow at the impeller inlet on the bottom disc 103, weakening the impact loss caused by the impact at the air flow separation 104 inlet, and the air flow entering the blade 104 through the slow flow column 301 is more uniform and smooth. When the air flow enters the flow passage between the blades 104, the uniformly arranged side guide vanes 201 split the air flow when the air flow flows through the side guide vanes 201. The side guide vanes 201 split and guide the air flow, making the flow distribution near the suction surface of the blade 104 more uniform, breaking the large vortex near the suction surface of the main flow area, and controlling the size of the vortex in the impeller. At the same time, when the air flow flows through the upper guide vane 202, the upper guide vane 202 divides the flow passage near the top disc 105 into two parts, thereby increasing the clamping degree of the air flow between the blades 104, weakening the occurrence of axial vortex, and following the rotation of the blade 104 to do work on the gas, thereby increasing the energy of the air flow in the flow passage area of the top disc 105. Therefore, during the operation of the fan, the combined action of the side guide vanes 201 and the upper guide vanes 202 can effectively weaken the generation of secondary flow near the wall of the impeller, prevent the transfer of low-energy fluid, effectively suppress the generation of axial vortex on the suction surface of the blade 104, thereby improving the speed distribution at the outlet of the impeller, weakening the occurrence of "jet wake" phenomenon, improving the flow characteristics in the impeller, reducing the flow loss of the fan, and improving the aerodynamic efficiency of the fan. When the blade rotates at high speed, the slow flow column 301 will rotate synchronously, and then the fixed ring 902 in the hollow cavity 701 will rotate. Under the action of centrifugal force and the guidance of the telescopic assembly, the rotating balls 904 on each semicircular sleeve 903 will rotate away from each other. During the rotation of the rotating balls 904 away from each other, the tapered sleeve 905 will be pushed away from the bottom disc 103 under the interaction force and the guidance of the guiding assembly, and then the extrusion plate 801 at one end of the extrusion rod 802 will move away from the bottom disc 103. In the process of moving away from the base plate 103, the gas in the connecting pipe 703 will enter the push pipe 702 under the action of air pressure difference, and then the push plate 704 moves close to the push pipe 702, and then the long plate 504 is driven to move close to the base plate 103 by the push rod 705, in the process of moving close to the base plate 103, the first gear 506 at one end of the driving rod 505 will be driven to move synchronously, and then rotate under the meshing transmission action of the first gear 506 and the second rack 604, under the action of the rotation of the first gear 506, the first rack 603 is driven to move close to the base plate 103 at the speed of the first gear 506 by the meshing transmission action and gear meshing relationship of the first gear 506 and the first rack 603, in the process of moving close to the base plate 103, the second gear 605 will be driven to rotate, and then the connecting plate 403 on the connecting shaft 402 is driven to rotate, thereby increasing the angle of attack between the upper guide vane 202 and the airflow, thereby enhancing the inhibition effect on the secondary flow, on the contrary, when the blade 104 speed decreases, the side guide vane 201 adjusts reversely, for reducing the resistance, so that the side guide vane 201 can dynamically adapt to the airflow characteristics under different speeds, further weakening the "jet - wake" phenomenon.

[0031] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action, without necessarily requiring or implying that these entities or actions are in any way mutually exclusive, or in any way arranged or ordered in succession or sequence relative to one another. Moreover, the terms "comprising" or "comprising" or any other variation thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0032] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A centrifugal fan without a volute and equipped with guide vanes and a flow modulator, comprising: The machine includes a frame (101) and a motor (102) mounted on the frame (101). The output end of the motor (102) is fixedly connected to a chassis (103). A plurality of blades (104) are fixedly connected to the side of the chassis (103) away from the motor (102). Each blade (104) is fixedly connected to a top plate (105) on the side away from the chassis (103). The machine is characterized by further comprising: Each side guide vane (201) is disposed on one side of each blade (104) close to each other. The side guide vanes (201) are equidistant from each other. The side guide vanes (201) are connected to the blades (104) by connecting components. Multiple upper guide vanes (202) are fixedly connected to the top plate (105) near the bottom plate (103). Each blade (104) is provided with a drive component for driving each side guide vane (201). A flow-slowing column (301) is provided on the side of the chassis (103) near the top plate (105). The flow-slowing column (301) is conical and has an arc-shaped surface (302) on its side wall.

2. A centrifugal fan without a volute and equipped with guide vanes and a flow slower according to claim 1, characterized in that: The connecting assembly includes two symmetrically arranged mounting plates (401) fixedly connected to the side of the blade (104) near the flow control column (301). A connecting plate (403) is connected between the two mounting plates (401) via a connecting shaft (402). One side of the side guide vane (201) is connected to the connecting plate (403). The blade (104) is provided with a driving assembly for driving the connecting plate (403).

3. A centrifugal fan without a volute and equipped with guide vanes and a flow slower according to claim 2, characterized in that: The drive assembly includes two symmetrically arranged first fixing plates (501) fixedly connected to the blade (104) near the connecting plate (403). A first T-shaped rod (502) is fixedly connected to one side of the two first fixing plates (501). A sliding plate (503) is slidably connected to the side wall of the two first T-shaped rods (502). A long strip plate (504) is fixedly connected to the side of the two sliding plates (503) near the mounting plate (401). A plurality of drive rods (505) are rotatably connected to the side of the long strip plate (504) near the connecting plate (403). A first gear (506) is fixedly connected to the side of each drive rod (505) away from the long strip plate (504). Each first gear (506) is connected to the connecting shaft (402) through a stroke amplification assembly.

4. A centrifugal fan without a volute and equipped with guide vanes and a flow slower according to claim 3, characterized in that: The stroke amplification component includes a second fixing plate (601) fixedly connected to the mounting plate (401) on the side near the long strip plate (504). The second fixing plate (601) is slidably connected to two symmetrically arranged second T-shaped rods (602). A first rack (603) is connected between the two second T-shaped rods (602) through a fixing block. The first rack (603) meshes with a first gear (506). The second rack (604) is fixedly connected to the end of the second fixing plate (601) away from the blade (104) through an L-shaped bracket. The second rack (604) meshes with the first gear (506). The second gear (605) is fixedly connected to the end of the connecting shaft (402) near the long strip plate (504). The second gear (605) meshes with the first rack (603). The slow-flow column (301) is provided with a pushing component for pushing the first gear (506).

5. A centrifugal fan without a volute and equipped with guide vanes and a flow slower according to claim 4, characterized in that: The pushing assembly includes a hollow cavity (701) formed in the slow-flow column (301). A pushing tube (702) is fixedly connected to the inner wall of the hollow cavity (701) near the chassis (103). A connecting tube (703) is fixedly connected to the side wall of the pushing tube (702). The end of the connecting tube (703) away from the pushing tube (702) passes through the slow-flow column (301) and is located at one end of the long strip plate (504). A pushing rod (705) is slidably connected to the end of the pushing tube (702) near the long strip plate (504). One end of the pushing rod (705) is connected to the long strip plate (504). The end of the pushing rod (705) away from the long strip plate (504) is located in the connecting tube (703) and is fixedly connected to the pushing plate (704). The pushing tube (702) is provided with a pressing assembly for pressing the pushing plate (704).

6. A centrifugal fan without a volute and equipped with guide vanes and a flow slower according to claim 5, characterized in that: The extrusion assembly includes an extrusion plate (801) slidably connected within a push tube (702). The push tube (702) is provided with a guide assembly for guiding the movement of the extrusion plate (801). An extrusion rod (802) is fixedly connected to the side of the extrusion plate (801) away from the chassis (103). The hollow cavity (701) is provided with a moving assembly for moving the extrusion rod (802). A first spring (803) is fixedly connected to the side of the extrusion plate (801) away from the extrusion rod (802). One end of the first spring (803) away from the extrusion plate (801) is connected to the bottom wall of the push tube (702).

7. A centrifugal fan without a volute and equipped with guide vanes and a flow slower according to claim 6, characterized in that: The guide assembly includes a spline rod (1101) fixedly connected to the bottom wall of the push tube (702), and both the extrusion plate (801) and the extrusion rod (802) are provided with spline holes (1102) that match the spline rod (1101).

8. A centrifugal fan without a volute and equipped with guide vanes and a flow slower according to claim 7, characterized in that: The moving component includes a mounting rod (901) fixedly connected to the inner wall of the hollow cavity (701) away from the chassis (103). A fixing ring (902) is fixedly connected to one end of the mounting rod (901) near the push tube (702). A plurality of semi-circular sleeves (903) arranged in a ring array are slidably connected to the periphery of the fixing ring (902). Each semi-circular sleeve (903) is rotatably connected to a rotating ball (904). The fixing ring (902) is provided with a telescopic component for extending and retracting each rotating ball (904). A conical sleeve (905) is slidably connected to the periphery of the fixing ring (902). Each rotating ball (904) is located inside the conical sleeve (905).

9. A centrifugal fan without a volute and equipped with guide vanes and a flow slower according to claim 8, characterized in that: The tapered end of the tapered sleeve (905) is close to the chassis (103) and is connected to the extrusion rod (802) through the tapered shell.

10. A centrifugal fan without a volute and equipped with guide vanes and a flow slower according to claim 9, characterized in that: The telescopic assembly includes a telescopic tube (1001) fixedly connected to the side wall of the fixed ring (902). The telescopic tube (1001) is slidably connected to a telescopic rod (1002). One end of the telescopic rod (1002) is connected to a semi-circular sleeve (903). The end of the telescopic rod (1002) away from the semi-circular sleeve (903) is located inside the telescopic tube (1001) and is fixedly connected to a telescopic plate (1003). A second spring (1004) is sleeved on the side wall of the telescopic rod (1002). The two ends of the second spring (1004) are respectively connected to the telescopic plate (1003) and the inner wall of the telescopic tube (1001).

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