Low-resistance centrifugal fan shell

Abstract

The utility model relates to the technical field of centrifugal fans, and discloses a low-resistance centrifugal fan shell which comprises a shell body, an air inlet is formed in one side of the shell body, an air guide ring is arranged in the air inlet, the outer wall of one side of the shell body is fixedly connected with an installation ring, and the installation ring corresponds to the air inlet. A plurality of transmission gears are rotatably connected to the circumferential outer wall of the mounting ring at equal intervals, a plurality of storage grooves are formed in the circumferential inner wall of the mounting ring at equal intervals, movable grooves are formed in the inner walls of the storage grooves, movable blocks are slidably arranged on the inner walls of the movable grooves, threaded grooves are formed in the faces, away from the storage grooves, of the movable blocks, and threaded rods are connected to the inner walls of the threaded grooves through threads; the threaded rod is connected with the transmission gear through a connecting shaft; according to the utility model, the air guide ring and the air inlet can be kept coaxial, airflow is guided to enter the impeller more smoothly through the air guide ring, and turbulent flow and vortex of the airflow in the entering process are reduced, so that the energy loss and the wind resistance are reduced.

Description

Technical Field

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

[0002] A centrifugal fan is a driven fluid machine that uses a high-speed rotating impeller to accelerate gas, then decelerate and change the flow direction, converting kinetic energy into potential energy. Due to its high air volume and pressure, centrifugal fans are widely used in ventilation systems, industrial production, energy generation, mine and tunnel ventilation, cooling systems, food processing and manufacturing, hospitals and laboratories, agriculture and greenhouses, and other fields. Centrifugal fans are mainly composed of a casing, main shaft, impeller, bearing transmission mechanism, and motor. The casing of a centrifugal fan is a sealed metal structure. Its main function is to install and protect the centrifugal impeller, ensure that the centrifugal impeller can rotate freely, and contain sufficient air intake. At the same time, the casing also helps to guide the flow of gas, ensuring smooth interaction of airflow.

[0003] At present, the existing low-resistance centrifugal fan casing usually includes a casing body, an air inlet and an air outlet. An air guide ring is usually installed in the air inlet. The air guide ring can guide the air flow to flow more smoothly through its specific shape and design, reduce eddy currents and turbulence, and thus reduce wind resistance; however, this existing technology still has many shortcomings, for example: when installing, the air guide ring needs to be highly coaxial with the impeller, and the impeller is coaxial with the air inlet. The air guide ring is mostly fixed to the air inlet by bolts. Whether the air guide ring and the impeller are coaxial is determined only by observation by the staff, which has poor accuracy and can easily cause axial deviation between the air guide ring and the impeller, thereby causing the impeller to contact the air guide ring during operation, causing damage to the device. Utility Model Content

[0004] The purpose of the present utility model is to provide a low-resistance centrifugal fan casing to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a low-resistance centrifugal fan casing, comprising a casing main body, wherein one side of the casing main body is provided with an air inlet, the air inlet is provided with an air guide ring, an outer wall of one side of the casing main body is fixedly connected with a mounting ring, the mounting ring corresponds to the air inlet, the circumferential outer wall of the mounting ring is rotatably connected with a plurality of transmission gears, the circumferential inner wall of the mounting ring is equidistantly provided with a plurality of receiving grooves, and the inner wall of the receiving groove is provided with a movable groove, and a movable block is slidably provided on the inner wall of the movable groove, and a threaded groove is provided on a side of the movable block away from the receiving groove, a threaded rod is threadedly connected to the inner wall of the threaded groove, and the threaded rod is connected to the transmission gear by a connecting shaft, and a rotating ring is rotatably connected to one side of the casing main body, the rotating ring is sleeved on the mounting ring, and a transmission gear ring meshing with the plurality of transmission gears is fixedly provided on the inner wall of one side of the rotating ring.

[0006] As a further improvement to the above solution, a limit plate is inserted into the inner wall of the storage groove, the limit plate is fixedly connected to the movable block, and a plurality of limit grooves that are compatible with the limit plate are opened at equal distances on the circumferential outer wall of the air guide ring.

[0007] As a further improvement to the above solution, a ratchet is fixedly provided on the circumferential outer wall of the rotating ring, and a pawl is rotatably connected to the outer wall of one side of the shell body through a torsion spring shaft, and the ratchet is adapted to the pawl.

[0008] As a further improvement to the above solution, a plurality of anti-slip grooves are provided at equal intervals on one side of the rotating ring, and the anti-slip grooves are integrally formed with the rotating ring.

[0009] As a further improvement to the above solution, movable grooves are opened on the inner walls of both sides of the movable groove, and movable blocks are slidably connected to the inner walls of the movable grooves, and the movable blocks are fixedly connected to the movable blocks.

[0010] As a further improvement to the above solution, a mounting hole is provided on a side of the housing body away from the air inlet, and the mounting hole is coaxially arranged with the air inlet.

[0011] As a further improvement to the above solution, an air outlet is provided on the top of the shell body, and the shell body and the air guide ring are both made of fiberglass.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model is that a connecting shaft is connected between the threaded rod and the transmission gear, and one side of the shell body is rotated to connect the rotating ring, and the rotating ring is sleeved on the mounting ring. A transmission gear ring meshing with multiple transmission gears is fixed on the inner wall of one side of the rotating ring. When the air guide ring is installed, the air guide ring is first placed in the mounting ring, and then the rotating ring is rotated. When the rotating ring rotates, it drives the transmission gear ring to rotate, and the transmission gear ring drives the transmission gear to rotate, thereby driving the threaded rod to rotate through the connecting shaft, and limiting the movable block through the movable groove, thereby cooperating with the action of the threaded groove to drive multiple movable blocks to move outward at the same time, squeezing the air guide ring. Since the multiple movable blocks move synchronously toward the center of the circle, the air guide ring is pushed to move, so that the air guide ring and the air inlet remain coaxial, thereby avoiding axial deviation between the air guide ring and the impeller, guiding the airflow into the impeller more smoothly through the air guide ring, reducing turbulence and eddy currents of the airflow during the entry process, thereby reducing energy loss and wind resistance.

[0014] The utility model fixes a ratchet on the circumferential outer wall of the rotating ring, and the outer wall of one side of the shell body is rotatably connected to the pawl through the torsion spring rotating shaft. The ratchet is adapted to the pawl. When the positioning of the air guide ring is completed, the movable block drives the limit plate into the limit groove to squeeze and fix the air guide ring. The rotating ring is limited by the ratchet and the pawl to prevent the rotating ring from reversing and causing the air guide ring to be loosened during installation. When disassembling, the pawl is first moved and then the rotating ring is rotated in the opposite direction, thereby achieving the purpose of facilitating the installation and disassembly of the air guide ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model from a first viewing angle;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model from a second viewing angle;

[0018] Figure 3 This is a schematic diagram of the exploded three-dimensional structure of the air guide ring and the mounting ring in the present invention;

[0019] Figure 4 This is a schematic diagram of the exploded three-dimensional structure of the mounting ring and the rotating ring in the present invention;

[0020] Figure 5 This is a schematic diagram of the three-dimensional structure of the transmission gear ring in the present utility model;

[0021] Figure 6 This is a schematic side sectional structural diagram of the mounting ring in the present utility model;

[0022] Figure 7 For this utility model Figure 6 Schematic diagram of the enlarged structure at point A in the middle.

[0023] In the figure: 1. Shell body; 2. Air outlet; 3. Air inlet; 4. Air guide ring; 5. Mounting hole; 6. Limiting groove; 7. Mounting ring; 8. Rotating ring; 9. Ratchet; 10. Pawl; 11. Torsion spring shaft; 12. Anti-slip groove; 13. Transmission gear; 14. Limiting plate; 15. Transmission gear ring; 16. Storage groove; 17. Movable groove; 18. Movable block; 19. Threaded groove; 20. Threaded rod; 21. Connecting shaft; 22. Movable groove; 23. Movable block. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0025] A low-resistance centrifugal fan housing, such as Figures 1 to 7 As shown, it includes a shell body 1, an air inlet 3 is opened on one side of the shell body 1, and an air guide ring 4 is set in the air inlet 3. The air guide ring 4 guides the air flow to enter the impeller more smoothly, reduces the turbulence and vortex of the air flow during the entry process, thereby reducing energy loss and wind resistance. The outer wall of one side of the shell body 1 is connected with a mounting ring 7 by bolts. The mounting ring 7 corresponds to the air inlet 3. The outer wall of the circumference of the mounting ring 7 is equidistantly connected to a plurality of transmission gears 13. The inner wall of the circumference of the mounting ring 7 is equidistantly opened with a plurality of receiving grooves 16, and the receiving grooves 16 are equidistant. A movable groove 17 is provided on the inner wall of the movable groove 17, and a movable block 18 is slidably provided on the inner wall of the movable groove 17. The movable block 18 and the movable groove 17 are both rectangular. A threaded groove 19 is provided on the side of the movable block 18 away from the receiving groove 16. The inner wall of the threaded groove 19 is connected to a threaded rod 20 through a thread. The threaded rod 20 is connected to the transmission gear 13 through a connecting shaft 21. One side of the shell body 1 is rotatably connected to a rotating ring 8, which is sleeved on the mounting ring 7. A transmission gear ring 15 meshing with multiple transmission gears 13 is fixed on the inner wall of one side of the rotating ring 8.

[0026] like Figure 5 and Figure 7As shown, a plurality of anti-skid grooves 12 are opened at equal distances on one side of the rotating ring 8, and the anti-skid grooves 12 are integrally formed with the rotating ring 8. The anti-skid grooves 12 facilitate the rotation of the rotating ring 8; movable grooves 22 are opened on the inner walls on both sides of the movable groove 17, and the inner walls of the movable grooves 22 are slidably connected with movable blocks 23, and the movable blocks 23 are connected to the movable blocks 18 by bolts. The movable grooves 22 and the movable blocks 23 prevent the movable blocks 18 from rotating while preventing the movable blocks 18 from escaping from the movable grooves 17.

[0027] like Figure 1 and Figure 2 As shown, a mounting hole 5 is provided on the side of the shell body 1 away from the air inlet 3. The mounting hole 5 is coaxially arranged with the air inlet 3. The impeller shaft of the fan motor can be easily installed through the mounting hole 5. An air outlet 2 is provided on the top of the shell body 1. The shell body 1 and the air guide ring 4 are both made of fiberglass. The design of the fiberglass material increases the corrosion resistance of the fan.

[0028] In Example 1, when installing the air guide ring 4, first place the air guide ring 4 in the installation ring 7, and then rotate the rotating ring 8. When rotating, the rotating ring 8 will drive the transmission gear ring 15 to rotate, and the transmission gear ring 15 drives the transmission gear 13 to rotate, thereby driving the threaded rod 20 to rotate through the connecting shaft 21, and limiting the movable block 18 through the movable groove 17, so that under the action of the threaded groove 19, multiple movable blocks 18 are driven to move outward at the same time to squeeze the air guide ring 4. Since multiple movable blocks 18 move synchronously toward the center of the circle, the air guide ring 4 is pushed to move, so that the air guide ring 4 and the air inlet 3 remain coaxial, thereby avoiding axial deviation between the air guide ring 4 and the impeller, and guiding the airflow into the impeller more smoothly through the air guide ring 4, reducing turbulence and eddy currents of the airflow during the entry process, thereby reducing energy loss and wind resistance. Example 2

[0029] Example 2 is based on Example 1, as Figures 3 to 5 As shown, the inner wall of the receiving groove 16 is inserted with a limit plate 14, and the limit plate 14 is connected to the movable block 18 by bolts. The circumferential outer wall of the air guide ring 4 is equidistantly provided with a plurality of limit grooves 6 that are compatible with the limit plate 14. The limit grooves 6 and the limit plates 14 facilitate the limited installation of the air guide ring 4; a ratchet 9 is fixedly provided on the circumferential outer wall of the rotating ring 8, and a pawl 10 is rotatably connected to the outer wall of one side of the shell body 1 through a torsion spring shaft 11. The ratchet 9 is compatible with the pawl 10, and the ratchet 9 and the pawl 10 prevent the rotating ring 8 from reversing.

[0030] In Example 2, when the positioning of the air guide ring 4 is completed, the movable block 18 will drive the limiting plate 14 to enter the limiting groove 6, squeeze and fix the air guide ring 4, and limit the rotating ring 8 through the ratchet 9 and the pawl 10 to prevent the rotating ring 8 from reversing and causing the air guide ring 4 to be loose. When disassembling, first move the pawl 10, and then rotate the rotating ring 8 in the opposite direction, so as to facilitate the installation and disassembly of the air guide ring 4.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-resistance centrifugal fan housing, comprising a housing body (1), characterized in that: An air inlet (3) is provided on one side of the shell body (1), and an air guide ring (4) is provided inside the air inlet (3). A mounting ring (7) is fixedly connected to the outer wall of one side of the shell body (1), and the mounting ring (7) corresponds to the air inlet (3). The outer wall of the circumference of the mounting ring (7) is rotatably connected to a plurality of transmission gears (13) at equal intervals. The inner wall of the circumference of the mounting ring (7) is equidistantly provided with a plurality of receiving grooves (16), and the inner wall of the receiving groove (16) is provided with a movable groove (17). The inner wall of the movable groove (17) is provided with a movable A movable block (18) is provided with a threaded groove (19) on one side of the movable block (18) away from the receiving groove (16); a threaded rod (20) is connected to the inner wall of the threaded groove (19) by a thread; the threaded rod (20) is connected to the transmission gear (13) by a connecting shaft (21); a rotating ring (8) is rotatably connected to one side of the housing body (1); the rotating ring (8) is sleeved on the mounting ring (7); and a transmission gear ring (15) meshing with a plurality of the transmission gears (13) is fixedly provided on the inner wall of one side of the rotating ring (8).

2. A low-resistance centrifugal fan housing according to claim 1, characterized in that: A limiting plate (14) is inserted into the inner wall of the receiving groove (16), the limiting plate (14) is fixedly connected to the movable block (18), and a plurality of limiting grooves (6) adapted to the limiting plate (14) are formed at equal intervals on the circumferential outer wall of the air guide ring (4).

3. A low-resistance centrifugal fan housing according to claim 2, characterized in that: A ratchet (9) is fixedly provided on the circumferential outer wall of the rotating ring (8), and a pawl (10) is rotatably connected to the outer wall of one side of the housing body (1) via a torsion spring rotating shaft (11), and the ratchet (9) is adapted to the pawl (10).

4. The low-resistance centrifugal fan housing according to claim 1, characterized in that: A plurality of anti-slip grooves (12) are provided at equal intervals on one side of the rotating ring (8), and the anti-slip grooves (12) are integrally formed with the rotating ring (8).

5. The low-resistance centrifugal fan housing according to claim 1, characterized in that: The inner walls of both sides of the movable groove (17) are provided with movable grooves (22), the inner walls of the movable groove (22) are slidably connected to movable blocks (23), and the movable blocks (23) are fixedly connected to the movable block (18).

6. The low-resistance centrifugal fan housing according to claim 1, characterized in that: A mounting hole (5) is provided on a side of the housing body (1) away from the air inlet (3), and the mounting hole (5) is coaxially arranged with the air inlet (3).

7. The low-resistance centrifugal fan housing according to claim 1, characterized in that: An air outlet (2) is provided at the top of the shell body (1), and both the shell body (1) and the air guide ring (4) are made of glass fiber reinforced plastic.

Images