High-pressure low-noise energy-saving centrifugal fan for printing industry

Abstract

The invention discloses a high-pressure, low-noise and energy-saving centrifugal fan for the printing industry, which comprises a fan volute, a horizontal positioning frame, a fan blade, a fan blade and a fan blade, the center of the air inlet is formed in the end face of one side of the fan volute, and an air inlet base is coaxially installed in the air inlet; the air supply outlet is obliquely formed in the peripheral side wall of the fan volute; the impeller mechanism is rotationally mounted in the fan volute and is coaxial with the air inlet; the impeller mechanism can be matched with the air inlet base to guide airflow outside the fan volute into the fan volute in a negative pressure mode, the multiple installation grooves used for installing the blade plates in a sliding mode are distributed in the back plate in the impeller mechanism, and the blade plates can be driven by rotation of the rotary disc to linearly slide along the installation grooves to be adjusted so as to be gathered together or separated. The tapered flow channel is formed by matching with the inclined surface at the upper end in the air inlet seat; or matched with the inclined surface at the lower end in the air inlet seat to form a divergent flow channel so as to adapt to different working conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of centrifugal fans, and specifically relates to a high-pressure, low-noise and energy-saving centrifugal fan for the printing industry. Background Art

[0002] The demand for centrifugal fans in the printing industry mainly focuses on two scenarios: high-pressure air supply (such as drying and conveying) and large-flow ventilation (such as cooling and dehumidification). In traditional technologies, fixed-vane centrifugal fans are used, that is, the impeller blades are fixed, and forward, backward or radial blade designs are adopted. The air volume and air pressure are adjusted through a frequency converter or a damper. However, in different process stages of a printing press, the air volume and pressure characteristics need to be quickly switched. The existing technology cannot be dynamically adapted, and it is necessary to frequently replace centrifugal fans of different specifications for specific operations, which increases the complexity of maintenance and operation.

[0003] Therefore, it is necessary to provide a high-pressure, low-noise and energy-saving centrifugal fan for the printing industry to solve the problems raised in the above background art. Summary of the Invention

[0004] To achieve the above object, the present invention provides the following technical solution: A high-pressure, low-noise and energy-saving centrifugal fan for the printing industry, which includes:

[0005] A fan volute, with a horizontally arranged positioning frame installed below it;

[0006] An air inlet, with its center set on one end face of the fan volute, and an air inlet seat coaxially installed in the air inlet;

[0007] An air outlet, inclined and arranged on the outer peripheral side wall of the fan volute;

[0008] An impeller mechanism, rotatably installed in the fan volute and coaxially arranged with the air inlet. A driving shaft is rotatably arranged at the center of the inner axis of the fan volute, and one end of the driving shaft is connected to the impeller mechanism;

[0009] The impeller mechanism includes:

[0010] A back plate, coaxially installed with the driving shaft, with a positioning sleeve vertically fixed in the middle of the back plate, and one end of the driving shaft slidingly extending into the positioning sleeve;

[0011] Installation grooves, opened on one end face of the back plate, and a plurality of the installation grooves are circumferentially arrayed along the back plate;

[0012] Blade plates, corresponding to each of the installation grooves, and each blade plate is slidably and adjustably installed in the installation groove.

[0013] Further, preferably, when the vane plates slide along the mounting grooves, they gather or separate from each other. The upper edge of the cross-section of the vane plate is set to a triangular structure, and the vane plates form a conical air flow guiding form in the gathered state.

[0014] Further, preferably, two support plates are symmetrically fixed on both sides of each mounting groove on the back plate, and the support plates clamp the two sides of the vane plate left and right;

[0015] Guide grooves are horizontally formed on the support plates, and a shaft pin is vertically fixed on the side wall of the vane plate, and the shaft pin is slidably connected with the guide groove.

[0016] Further, preferably, a guide block is slidably connected in the mounting groove, and the lower ends of the vane plates are hinged to the guide block, and a limiting column is vertically fixed on the lower end surface of the guide block;

[0017] A turntable is rotatably arranged below the back plate, and a plurality of inclined grooves corresponding to the guide blocks are formed in the turntable, and the limiting columns are all slidably connected with the inclined grooves.

[0018] Further, preferably, a shaft ring is coaxially slidably connected outside the drive shaft, a collar is coaxially fixed on the shaft ring, and an arc-shaped groove is formed in the inner wall of the collar; the turntable is slidably connected with the collar, and a pin is vertically fixed on the side wall of the turntable, and the pin is slidably connected with the arc-shaped groove;

[0019] A fixed shaft sleeve is rotatably sleeved at one end of the shaft ring far away from the collar, and an inner spring is arranged between the fixed shaft sleeve and the drive shaft; a dialing rod is hinged outside the fan volute, one end of the dialing rod abuts against the lower end of the fixed shaft sleeve, and a propulsion cylinder is installed outside the fan volute, and the output end of the propulsion cylinder is connected with the other end of the dialing rod.

[0020] Further, preferably, a guiding groove is also formed on the support plate near the center of the circle, and each vane plate is slidably connected with the guiding groove through a guide pin vertically fixed on its end face.

[0021] Further, preferably, the guiding groove is set to an upwardly inclined inclined groove structure.

[0022] Further, preferably, the inner wall section of the air inlet seat is constructed into a two-stage inclined surface structure. When the vane plates gather along the mounting grooves, each vane plate cooperates with the upper inclined surface of the air inlet seat; when the vane plates separate along the mounting grooves, each vane plate cooperates with the lower inclined surface of the air inlet seat.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] In the present invention, an air inlet seat is installed at the air inlet position of the blower volute, and an impeller mechanism is rotatably arranged at the center inside the blower volute. The impeller mechanism can cooperate with the air inlet seat to negatively drain the air flow outside the blower volute into the blower volute. In the impeller mechanism, a plurality of installation grooves for slidably installing blade plates are distributed on the back plate. The blade plates can be linearly slid and adjusted along the installation grooves by the rotation drive of the turntable so as to gather or separate from each other. Among them, when the blade plates gather together, they can simultaneously deflect towards the axis through the sliding action of the guide pins and the guiding grooves, thereby combining to form a conical air flow guiding form. At this time, it can cooperate with the upper inner inclined surface of the air inlet seat to form a gradually shrinking flow channel, so as to enhance the axial acceleration of the air flow and be suitable for the high-pressure penetrating air flow required in the drying section of the printing machine.

[0025] When the blade plates separate from each other, at this time, the blade plates generate reverse deflection through the sliding action of the guide pins and the guiding grooves. At this time, the blade plates cooperate with the lower inner inclined surface of the air inlet seat to form a gradually expanding flow channel, so as to increase the air volume and adapt to the large flow demand (such as in the cooling of the printing machine oven or the heat dissipation of the motor and other large air volume and low pressure scenarios); thus, through the two-way dynamic adjustment mechanism, the adaptive switching between the high-pressure and large-flow working conditions is realized. Brief Description of the Drawings

[0026] Figure 1 is the overall structural schematic diagram of the present invention;

[0027] Figure 2 is the internal structural schematic diagram of the present invention;

[0028] Figure 3 is the structural schematic diagram of the impeller mechanism in the present invention;

[0029] Figure 4 is the distribution structural schematic diagram of the installation grooves in the present invention;

[0030] Figure 5 is the installation structural schematic diagram of the guide block in the present invention;

[0031] Figure 6 is the structural schematic diagram of the turntable and the inclined groove in the present invention;

[0032] Figure 7 is the structural schematic diagram of the propulsion cylinder in the present invention;

[0033] In the figure: 1. Blower volute; 11. Air inlet seat; 12. Air supply port; 13. Positioning frame; 14. Driving shaft; 2. Impeller mechanism; 21. Back plate; 22. Positioning sleeve; 23. Installation groove; 24. Blade plate; 25. Guide block; 26. Limit post; 3. Support plate; 31. Lead screw groove; 32. Axle pin; 33. Guiding groove; 4. Turntable; 41. Inclined groove; 42. Axle ring; 43. Ring sleeve; 44. Pin; 45. Fixed shaft sleeve; 46. Dialing rod; 47. Propulsion cylinder. Detailed implementation mode

[0034] Please refer to Figures 1-7 , in the embodiment of the present invention, a high-pressure, low-noise and energy-saving centrifugal fan for the printing industry includes:

[0035] The fan volute 1, with a horizontally arranged positioning frame 13 installed below it;

[0036] The air inlet, with the center set on one end face of the fan volute 1, and an air inlet seat 11 coaxially installed in the air inlet;

[0037] The air outlet 12, inclinedly arranged on the outer peripheral side wall of the fan volute 1;

[0038] The impeller mechanism 2, rotatably installed in the fan volute 1 and coaxially arranged with the air inlet. A driving shaft 14 is rotatably arranged at the inner shaft center of the fan volute 1, and one end of the driving shaft 14 is connected to the impeller mechanism 2;

[0039] The impeller mechanism 2 includes:

[0040] The back plate 21, coaxially installed with the driving shaft 14. A positioning sleeve 22 is vertically fixed in the middle of the back plate 21, and one end of the driving shaft 14 slides into the positioning sleeve 22. Thus, when the driving shaft 14 rotates, it can drive the back plate 21 to rotate integrally through the positioning sleeve 22;

[0041] The installation grooves 23 are opened on one end face of the back plate 21, and a plurality of the installation grooves 23 are circumferentially arrayed along the back plate 21;

[0042] The blade plates 24 are arranged corresponding to the installation grooves 23, and each blade plate 24 is slidably and adjustably installed in the installation groove 23.

[0043] In this embodiment, when the blade plates 24 slide along the installation grooves 23, they gather or separate from each other. The upper edge of the cross-section of the blade plate 24 is set as a triangular structure, and the blade plates 24 form a conical air flow guiding form in the gathered state, so as to be able to cooperate with the air inlet seat to form a gradually shrinking flow channel, improving the air flow acceleration efficiency by 25 - 30%, reducing the turbulence intensity from 12% to 3.8%, and reducing the flow separation loss.

[0044] As a preferred embodiment, two support plates 3 are symmetrically fixed on both sides of each installation groove 23 on the back plate 21, and the support plates 3 clamp the two sides of the blade plate 24 from left and right;

[0045] The support plates 3 are horizontally provided with lead grooves 31. A shaft pin 32 is vertically fixed on the side wall of the blade plate 24. The shaft pin 32 is slidably connected with the lead groove 31. It should be noted that the two support plates 3 can cooperate to form a "guide rail channel" for clamping left and right. The distance between the support plates 3 is controlled to be the width of the blade plate 24 + 1.0 - 1.2 mm (ensuring sliding freedom but without shaking), and the clearance between the lead groove 31 and the shaft pin 32 is ≤ 0.03 mm, so that the blade plate 24 achieves a complete fixing effect, the bending stiffness is increased by 300%, and the maximum allowable rotational speed of the centrifugal fan is increased from 2500 rpm to 3500 rpm.

[0046] In this embodiment, a guide block 25 is slidably connected in the installation groove 23. The lower ends of the blade plates 24 are all hinged to the guide block 25. A limiting column 26 is vertically fixed on the lower end surface of the guide block 25;

[0047] A turntable 4 is rotatably arranged below the back plate 21. A plurality of inclined grooves 41 corresponding to the guide blocks 25 are opened in the turntable 4. The limiting columns 26 are all slidably connected with the inclined grooves 41, so that during the forward and reverse rotation of the turntable, it can drive the blade plates 24 to slide close to or away from the center of the circle along the installation groove 23 through the sliding action between the inclined grooves 41 and the limiting columns 26.

[0048] In this embodiment, a shaft collar 42 is coaxially slidably connected outside the driving shaft 14. A collar 43 is coaxially fixed on the shaft collar 42. An arc-shaped groove is opened on the inner wall of the collar 43; the turntable 4 is slidably connected with the collar 43, and a pin 44 is vertically fixed on the side wall of the turntable 4. The pin 44 is slidably connected with the arc-shaped groove;

[0049] A fixed shaft sleeve 45 is rotatably sleeved on one end of the shaft collar 42 away from the collar 43. An inner spring is arranged between the fixed shaft sleeve 45 and the driving shaft 14; a dialing rod 46 is hinged outside the fan volute 1. One end of the dialing rod 46 abuts against the lower end of the fixed shaft sleeve 45, and a propulsion cylinder 47 is installed outside the fan volute 1. The output end of the propulsion cylinder 47 is connected with the other end of the dialing rod 46. It should be noted that the inner spring can make the fixed shaft sleeve 45 slide axially away from the back plate 21 along the driving shaft 14 under the action of elastic force. At this time, the blade plates 24 above the back plate 21 are in a separated distribution state. During the rotation of the driving shaft 14 driving the back plate 21, the shaft collar 42 can rotate synchronously with the driving shaft 14; when the propulsion cylinder 47 is telescoping and advancing, it can gradually move the fixed shaft sleeve 45 axially close to the back plate 21 along the driving shaft 14 through the dialing rod 46. At this time, the turntable 4 can be deflected by the sliding action between the pin 44 and the arc-shaped groove, so as to slide and adjust the blade plates 24 on the back plate 21 through the turntable 4 and gradually make them in a gathered state.

[0050] In this embodiment, a guiding groove 33 is further formed on one side of the support plate 3 close to the center of the circle, and each vane 24 is slidably connected to the guiding groove 33 through a guide pin vertically fixed to its end face.

[0051] As a preferred embodiment, the guiding groove 33 is arranged as an upwardly inclined chute structure. With such an arrangement, when the vane 24 slides close to or away from the center of the circle along the guiding groove 33, the shaft pin 32 moves along the trajectory of the guiding groove 33, and the vane 24 automatically generates an accurate deflection. As a result, the vane 24 deflects centripetally by 12° ± 0.5° in the gradually converging state, and when in the separated state, the vane 24 deflects reversely by 8° ± 0.5°.

[0052] In this embodiment, the inner wall section of the air inlet seat 11 is configured as a two-stage inclined surface structure. When the vanes 24 converge with each other along the installation groove 23, each vane 24 cooperates with the upper inclined surface of the air inlet seat 11; when the vanes 24 separate from each other along the installation groove 23, each vane 24 cooperates with the lower inclined surface of the air inlet seat 11. With such an arrangement, when the vanes 24 are in the converging state and cooperate with the upper inclined surface of the air inlet seat 11, a gradually narrowing flow channel is formed between them and the air inlet seat 11, so as to enhance the axial acceleration of the air flow. During normal operation, the air flow velocity increases from 18 m / s at the inlet to 28 - 32 m / s at the outlet (an increase of 55 - 78%), which is suitable for the high-pressure penetrating air flow required in the drying section of the printing machine, so as to shorten the ink curing time to 2.2 - 2.5 seconds.

[0053] When the vanes 24 are in the separated state and cooperate with the lower inclined surface of the air inlet seat 11, a gradually expanding flow channel is formed between them and the air inlet seat 11, so as to increase the air volume. During the working state, the air volume increases to 24,000 - 26,000 m³ / h, meeting the large-flow demand, such as paper surface cooling, with a rate of 8 - 10 °C / s; thus enabling the centrifugal classification to maintain the best performance under different working conditions.

[0054] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A high-pressure, low-noise and energy-saving centrifugal fan for the printing industry, characterized in that, It includes: A fan volute (1) with a horizontally arranged positioning frame (13) installed below it; An air inlet with its center set on one end face of the fan volute (1), and an air inlet seat (11) is coaxially installed inside the air inlet; An air outlet (12) is inclinedly arranged on the outer peripheral side wall of the fan volute (1); An impeller mechanism (2) is rotatably installed in the fan volute (1) and is coaxially arranged with the air inlet. A driving shaft (14) is rotatably arranged at the inner shaft center of the fan volute (1), and one end of the driving shaft (14) is connected to the impeller mechanism (2); The impeller mechanism (2) includes: A back plate (21) which is coaxially installed with the driving shaft (14). A positioning sleeve (22) is vertically fixed in the middle of the back plate (21), and one end of the driving shaft (14) slides into the positioning sleeve (22); Installation grooves (23) are opened on one end face of the back plate (21), and a plurality of the installation grooves (23) are circumferentially arrayed along the back plate (21); Blade plates (24) are arranged corresponding to the installation grooves (23), and each blade plate (24) is slidably and adjustably installed in the installation groove (23).

2. The high-pressure, low-noise and energy-saving centrifugal fan for the printing industry according to claim 1, wherein: During the sliding of each blade plate (24) along the installation groove (23), they gather or separate from each other. The upper edge of the cross-section of the blade plate (24) is set as a triangular structure, and the blade plates (24) form a conical air flow guiding form in the gathered state.

3. A high-pressure, low-noise and energy-saving centrifugal fan for the printing industry according to claim 1, characterized in that: Two support plates (3) are symmetrically fixed on both sides of the back plate (21) where each installation groove (23) is located. The support plates (3) clamp the two sides of the blade plate (24) from left and right; Guide grooves (31) are horizontally opened on the support plates (3). A shaft pin (32) is vertically fixed on the side wall of the blade plate (24), and the shaft pin (32) is slidably connected to the guide groove (31).

4. The high-pressure, low-noise and energy-saving centrifugal fan for the printing industry according to claim 3, wherein: A guide block (25) is slidably connected in the installation groove (23). The lower end of each blade plate (24) is hinged to the guide block (25), and a limit post (26) is vertically fixed on the lower end face of the guide block (25); A turntable (4) is rotatably arranged below the back plate (21). A plurality of inclined grooves (41) corresponding to the guide blocks (25) are opened in the turntable (4), and the limit posts (26) are all slidably connected to the inclined grooves (41); 5. The high-pressure, low-noise and energy-saving centrifugal fan for the printing industry according to claim 4, wherein: An axle collar (42) is coaxially slidably connected to the outside of the driving shaft (14). A collar (43) is coaxially fixed on the axle collar (42), and an arc-shaped groove is opened on the inner wall of the collar (43); The turntable (4) is slidably connected to the collar (43), and a pin (44) is vertically fixed on the side wall of the turntable (4), and the pin (44) is slidably connected to the arc-shaped groove; A fixed shaft sleeve (45) is rotatably sleeved on the outer upper end of the shaft collar (42) away from the collar (43), and an inner spring is arranged between the fixed shaft sleeve (45) and the drive shaft (14); a dialing rod (46) is hinged outside the fan volute (1), one end of the dialing rod (46) abuts against the lower end of the fixed shaft sleeve (45), and a propulsion cylinder (47) is installed outside the fan volute (1), and the output end of the propulsion cylinder (47) is connected to the other end of the dialing rod (46).

6. The high-pressure, low-noise and energy-saving centrifugal fan for the printing industry according to claim 3, wherein: A guiding groove (33) is further formed on one side of the support plate (3) close to the center of the circle, and each blade (24) is slidably connected to the guiding groove (33) through a guide pin vertically fixed to its end face.

7. The high-pressure, low-noise and energy-saving centrifugal fan for the printing industry according to claim 6, characterized in that: The guiding groove (33) is arranged as an upwardly inclined inclined groove structure.

8. The high-pressure, low-noise and energy-saving centrifugal fan for the printing industry according to claim 2, wherein: The inner wall section of the air inlet seat (11) is configured as a two-stage inclined surface structure. When the blades (24) gather together along the installation groove (23), each blade (24) cooperates with the upper inclined surface of the air inlet seat (11); when the blades (24) separate from each other along the installation groove (23), each blade (24) cooperates with the lower inclined surface of the air inlet seat (11).

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