Cooking fume exhaust centrifugal fan for kitchen
Through the design of rear-tilt impeller, pulley transmission and observation window, combined with the waste grease collection box and crack leakage gap, the dirt accumulation problem of traditional kitchen exhaust fans is solved, stable operation and efficient oil fume exhaust, reducing noise and maintenance difficulties.
Patent Information
- Application Number
- CN202422366828.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-27
AI Technical Summary
Traditional kitchen exhaust fans are prone to rust and fall off due to dirt accumulation after long-term use, causing the blades to rust and fall off or the motor to overload, making it difficult to repair, and cannot effectively remove oil fume and water vapor, affecting operation stability and safety.
The rear-tilt impeller, pulley transmission and observation window design are adopted, combined with the waste grease collection box and crack leakage gap, to facilitate cleaning and protection of key components, reduce the rotation speed to improve air volume and stability.
It extends the service life of the fan, improves the exhaust effect of the oil smoke, reduces noise, simplifies the maintenance process, and ensures the stability and reliability of the motor.
Smart Images
Figure CN223177762U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fan equipment, in particular to a centrifugal fan for exhausting kitchen fume. Background Art
[0002] In recent years, the catering industry in various cities has developed rapidly. There are countless large and small mid- to high-end restaurants and various takeaway workshops. Catering is inseparable from the kitchen system. The kitchen will produce a lot of oil smoke during the cooking process. The oil smoke contains a large amount of harmful substances, such as particulate matter and volatile organic compounds (VOCs). If it is not effectively discharged, it will not only threaten the health of kitchen staff, but also pollute the indoor air, affect the dining environment, and even cause fire hazards.
[0003] To solve the problem of exhausting oil fumes, it is necessary to install an exhaust fan. Traditionally, the exhaust fans installed in many catering kitchens are generally ordinary centrifugal fan boxes or small centrifugal fans similar to 4-72, which are not specially designed exhaust fans. In the exhaust pipe, although some large-scale kitchens are equipped with oil fume purification devices, it is obviously impossible to completely remove oil smoke and water vapor. Over time, they accumulate on the impeller of the fan. If it is a centrifugal fan box, the forward-inclined blades are made of galvanized steel sheet metal riveted, which can easily cause the accumulation of dirt, resulting in the impeller blades falling off due to weight and rust, until they completely fail. If a small centrifugal fan is used, even if the impeller has a longer service life than the forward-inclined blades, it is inevitable that the motor will stop due to overload operation. In theory, the motor can be replaced, but due to the structural limitations of the small centrifugal fan, the impeller must be disassembled, and the dirt inside the volute and on the impeller, as well as the cooking grease, have caused a huge workload for the maintenance personnel. Utility Model Content
[0004] The purpose of the utility model is to overcome the defects in the prior art and provide a centrifugal fan for kitchen fume exhaust, which is convenient for cleaning the inside of the fan, prolongs the stable operation life of the fan, and improves the fume exhaust effect of the fan.
[0005] The purpose of the utility model is achieved as follows: A centrifugal fan for kitchen range fumes exhaust, comprising a fan frame, a fan volute provided on the fan frame, a backward-inclined impeller provided in the fan volute, one end of the backward-inclined impeller being arranged toward the air inlet, and the other end being connected to a driving mechanism arranged in an outer cover shell along the axis direction of the backward-inclined impeller, the driving mechanism comprising a motor, an output shaft end of the motor being transmission-connected to a driving wheel, the driving wheel being connected to a driven wheel via a belt, the driven wheel being arranged on a transmission shaft of the backward-inclined impeller, one end of the transmission shaft being connected to the center position of the backward-inclined impeller, and the other end passing through the fan frame and extending into the outer cover shell and being connected to the driven wheel, the portion of the transmission shaft in the outer cover shell being supported and fixed by a bearing seat.
[0006] When the utility model works, the pulley is driven by a motor, and the pulley drives the impeller to drive the fan to rotate to obtain air volume, forming a strong air flow. The oil fume and water vapor in the kitchen are sucked in through the air flow. After being filtered by the filtering device inside the fan, the clean air and the remaining oil fume are discharged through the exhaust duct under the guidance of the fan volute. The oil fume centrifugal fan of the utility model runs reliably, has a long service life, has a good oil fume exhaust effect, and has low running noise.
[0007] Furthermore, a motor mounting base is also provided at the bottom of the outer housing, and the motor is fixedly installed on the motor mounting base through L-shaped anchor bolts; the L-shaped anchor bolts have high structural strength, improve the installation stability and durability of the motor, and ensure the reliable use of the motor.
[0008] Furthermore, a waste grease collection box is provided at the bottom of the fan frame, and the waste grease collection box is arranged below the blades of the backward-inclined impeller.
[0009] Furthermore, crack leakage gaps for leaking oil fume and water vapor are spaced apart at the bottom of the fan volute above the waste grease collection box, the width of the crack leakage gaps is 2 mm, the length is 150 mm, and 5 crack leakage gaps are arranged at equal intervals.
[0010] Furthermore, the waste grease collection box is of a drawer-type design; it is convenient to draw out the waste grease collection box for regular cleaning, avoiding the trouble of disassembling the fan from the air duct for cleaning, and providing convenience for maintenance personnel.
[0011] Furthermore, at least two bearing seats are provided; bearings for supporting and fixing the transmission shaft are arranged in the bearing seats, and the bearings are fixed and supported through the bearing seats, so as to ensure the stable operation of the transmission shaft. Multiple bearing seats can be set according to installation needs to firmly support the transmission shaft.
[0012] Furthermore, installation through holes for the transmission shaft to pass through are correspondingly provided on the fan frame and the outer housing, and the outer housing is detachably connected by a plurality of nuts and bolts through threads.
[0013] Furthermore, an observation window is also provided above the fan volute; through the observation window, the accumulation condition of the discharged oil fume and grease can be observed regularly, and a cleaning agent can also be sprayed through the observation window for simple cleaning, reducing the cleaning and maintenance burden.
[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0015] First, the impeller is driven by a pulley, which keeps the bearing housing out of the air duct, preventing it from being invaded by water vapor and waste grease. This makes it more convenient to replace the motor, avoiding the trouble of disassembling the whole machine from the pipeline and enabling a quicker restoration of operation. At the same time, components outside the fan volute such as the pulley, motor, belt, and bearing housing are protected by an outer cover, so that the fan can well protect key components even in an outdoor environment.
[0016] Second, the impeller is driven by a belt, enabling the impeller to obtain a larger air volume at a relatively lower speed. The low speed makes the overall operation of the fan more stable, with a low vibration value and less noise, which is beneficial to the noise reduction requirements of the usage environment.
[0017] Third, the present utility model adopts a backward-inclined impeller. The structure of the impeller is more stable than the forward-inclined impeller of the ordinary centrifugal fan box in the prior art, with more reliable operation and a longer service life.
[0018] Fourth, an observation window is provided on the fan volute, through which the accumulation of discharged oil fume and grease can be observed regularly. Cleaning agents can be sprayed through the observation window for simple cleaning. In addition, a crack leakage gap is provided at the bottom of the volute, so that water vapor and waste grease can be collected in the waste grease collection box, and can be conveniently drawn out for regular cleaning, avoiding the trouble of disassembling the fan from the air duct for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is a schematic structural view of the present utility model Figure 1 。
[0020] Figure 2 is Figure 1 an enlarged schematic structural view of part A in
[0021] Figure 3 is a schematic structural view of the present utility model Figure 2 。
[0022] Figure 4 is a schematic structural view of the present utility model Figure 3 。
[0023] In the above figures, reference numeral 1 denotes the air inlet, 2 the backward-inclined impeller, 3 the fan volute, 4 the observation window, 5 the motor, 6 the motor mounting base, 7 the bearing housing, 8 the transmission shaft, 9 the driving pulley, 10 the driven pulley, 11 the belt, 12 the fan frame, 13 the outer cover, 14 the waste grease collection box, and 15 the crack leakage gap. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0024] As Figures 1 to 4The shown example is a centrifugal fan for kitchen range fumes exhaust, comprising a fan frame 12, a fan volute 3 being provided on the fan frame 12, a backward-inclined impeller 2 being provided in the fan volute 3, one end of the backward-inclined impeller 2 being arranged toward the air inlet 1, and the other end being connected to a driving mechanism arranged in an outer cover shell 13 along the axial direction of the backward-inclined impeller 2, the driving mechanism comprising a motor 5, the output shaft end of the motor 5 being transmission-connected to a driving wheel 9, the driving wheel 9 being connected to a driven wheel 10 via a belt 11, the driven wheel 10 being arranged on a transmission shaft 8 of the backward-inclined impeller 2, one end of the transmission shaft 8 being connected to the center position of the backward-inclined impeller 2, the other end passing through the fan frame 12 and extending into the outer cover shell 13 and being connected to the driven wheel 10, the portion of the transmission shaft 8 in the outer cover shell 13 being supported and fixed by a bearing seat 7.
[0025] A motor mounting base 6 is further provided at the bottom of the outer cover 13 , on which the motor 5 is mounted and fixed via L-shaped anchor bolts; the L-shaped anchor bolts have high structural strength, which improves the installation stability and durability of the motor 5 and ensures reliable use of the motor 5 .
[0026] A waste grease collection box 14 is provided at the bottom of the fan frame 12, and the waste grease collection box 14 is arranged below the blades of the backward inclined impeller 2. The bottom of the fan volute 3 above the waste grease collection box 14 is spaced apart with crack leakage gaps 15 for leaking oil smoke and water vapor. The crack leakage gaps 15 are 2 mm wide and 150 mm long, and there are 5 crack leakage gaps 15 at equal intervals.
[0027] The waste grease collection box 14 is of a drawer-type design; the waste grease collection box 14 is conveniently pulled out for regular cleaning, avoiding the trouble of disassembling the fan from the air duct for cleaning, and providing convenience for maintenance personnel.
[0028] At least two bearing seats 7 are provided; bearings for supporting and fixing the transmission shaft 8 are provided in the bearing seats 7, and the bearings are fixed and supported by the bearing seats 7, thereby ensuring the stable operation of the transmission shaft 8. Multiple bearing seats can be provided according to installation requirements to provide firm support for the transmission shaft 8.
[0029] The fan frame 12 and the outer cover shell 13 are correspondingly provided with mounting through holes for the transmission shaft 8 to pass through. The outer cover shell 13 is detachably connected by a plurality of nuts and bolts through threads.
[0030] An observation window 4 is also provided above the fan volute 3; through the observation window 4, the accumulation of exhaust fume and grease can be regularly observed, and detergent can also be sprayed through the observation window 4 for simple cleaning, thereby reducing the burden of cleaning and maintenance.
[0031] When the utility model works, the pulley is driven by the motor 5. The pulley drives the impeller to drive the fan to rotate to obtain air volume. Specifically: when the motor 5 starts, the output shaft end thereof is drivingly connected to the driving wheel 9. The driving wheel 9 is drivingly connected to the driven wheel 10 through the belt 11. The driven wheel 10 is connected to the transmission shaft 8 connected to the backward-inclined impeller 2. The motor 5 drives the pulley to rotate, drives the backward-inclined impeller 2 to rotate through the transmission shaft 8, generates wind power. After the impeller rotates, the air volume increases and the wind pressure rises, forming a strong air flow, sucking the oil fume and water vapor in the kitchen. After being filtered by the internal filtering device of the fan, the clean air and the remaining oil fume are discharged through the exhaust duct under the guidance of the fan volute 3. In this device, the backward-inclined impeller 2 adopts pulley drive, so that the bearing seat 7 does not enter the air duct, avoiding being invaded by water vapor and waste grease. The replacement of the motor 5 is more convenient, avoiding the trouble of disassembling the whole machine from the pipeline, and the restoration of operation is faster. At the same time, the components outside the fan volute 3 such as the belt pulley, the motor 5, the belt 11, and the bearing seat 7 are protected by the outer cover 13, so that even if the fan is in an open-air environment, it can well protect the key components. By driving the impeller through the belt, the impeller can obtain a larger air volume at a relatively lower speed, and the low speed makes the overall operation of the fan more stable, with a low vibration value and less noise, which is beneficial to the noise reduction requirement of the use environment. The utility model adopts the backward-inclined impeller 2, and the impeller structure is more stable than the forward-inclined impeller of the ordinary centrifugal fan box in the prior art, the operation is more reliable, and the service life is longer. An observation window 4 is arranged on the fan volute 3, through which the accumulation of the discharged oil fume and grease can be observed regularly, and the cleaning agent can also be sprayed through the observation window 4 for simple cleaning. In addition, a crack leakage gap 15 is arranged at the bottom of the volute, so that the water vapor and waste grease leak into the waste grease collection box 14, and can be conveniently drawn out for regular cleaning, avoiding the trouble of disassembling the fan from the air duct for cleaning.
[0032] The utility model is not limited to the above embodiments. Based on the technical solutions disclosed in the utility model, those skilled in the art can make some substitutions and deformations to some technical features without creative labor according to the disclosed technical content, and these substitutions and deformations are all within the protection scope of the utility model.
Claims
1. An oil fume exhaust centrifugal fan for kitchen use, comprising a fan frame, a fan volute is provided on the fan frame, and a backward-inclined impeller is provided in the fan volute, and it is characterized in that: One end of the backward-inclined impeller faces the air inlet, and the other end is connected to a driving mechanism arranged inside the outer housing along the axis direction of the backward-inclined impeller. The driving mechanism includes a motor. The output shaft end of the motor is drivingly connected with a driving wheel. The driving wheel is connected with a driven wheel through a belt. The driven wheel is arranged on the transmission shaft of the backward-inclined impeller. One end of the transmission shaft is connected to the central position of the backward-inclined impeller, and the other end passes through the fan frame and extends into the outer housing to be connected with the driven wheel. The part of the transmission shaft inside the outer housing is supported and fixed by a bearing seat.
2. The centrifugal exhaust fan for kitchen according to claim 1, wherein: An electric motor mounting base is further provided at the bottom of the outer housing, and the electric motor is fixedly mounted on the electric motor mounting base through L-shaped anchor bolts.
3. The centrifugal exhaust fan for kitchen according to claim 1, characterized in that: A waste grease collection box is provided at the bottom of the fan frame, and the waste grease collection box is arranged below the blades of the backward-inclined impeller.
4. The oil fume exhaust centrifugal fan for kitchen according to claim 3, characterized in that: Crack leakage gaps for leaking oil fume and water vapor are spacedly provided at the bottom of the fan volute above the waste grease collection box.
5. The centrifugal exhaust fan for kitchen according to claim 4, characterized in that: The width of the crack leakage gap is 2 mm and the length is 150 mm, and 5 crack leakage gaps are equidistantly provided.
6. The oil fume exhaust centrifugal fan for kitchen according to claim 3, characterized in that: The waste grease collection box is of a drawer type design.
7. A centrifugal exhaust fan for kitchen use according to claim 1, characterized in that: At least two bearing seats are provided.
8. The centrifugal exhaust fan for kitchen according to claim 1, characterized in that: Corresponding mounting through holes for the transmission shaft to pass through are provided on the fan frame and the outer housing, and the outer housing is detachably connected by threads through a plurality of nuts and bolts.
9. A centrifugal exhaust fan for kitchen use according to any one of claims 1 to 8, characterized in that: An observation window is further provided above the fan volute.