A type of range hood

Abstract

A range hood includes a horizontally arranged fume extraction fan installed inside the upper casing. The fume extraction fan is a centrifugal fan with a lower air inlet and an upper air inlet. The lower casing has a smoke inlet chamber, with the lower air inlet being the main air inlet and the upper air inlet being an auxiliary air inlet. A fan cover is installed at the bottom of the upper casing, and a ventilation opening corresponding to the lower air inlet is opened on the fan cover. The ventilation opening is connected to the smoke inlet chamber through a duct. A diverter pipe is installed at the lower air inlet, and the lower end of the diverter pipe forms an air inlet port. An air inlet gap is formed between the diverter pipe and the fan cover, which is connected to the upper air inlet. The diameter of the air inlet port of the diverter pipe is adjusted by an adjustment mechanism. The range hood has a diversion pipe installed at the air inlet of the range hood fan. The flow rate at this location is distributed by adjusting the diameter of the diversion pipe's air inlet port through an adjustment mechanism. This increases the air volume at the main air inlet of the range hood fan, reduces the turbulent area of ​​the airflow at this location, improves the main air intake efficiency, and reduces the noise of the range hood fan.

Description

Technical Field

[0001] This invention relates to the field of oil fume purification technology, and in particular to an oil fume extractor. Background Technology

[0002] Currently, most range hoods installed in the ceiling adopt a horizontal installation, with the fan inlet facing the direction of airflow. For fans with a single-suction volute, the fan inlet is vertically downward, and the airflow enters the fan directly. For example, the range hood published in Chinese invention patent application No. 202211368741.6 (publication number CN 115682068 A) includes a fan assembly and a duct assembly. The fan assembly includes a casing and a fan inclinedly installed inside the casing. The casing has a casing air inlet. The duct assembly is connected to the casing, and the inner cavity of the duct assembly is connected to the casing air inlet. The connection between the duct assembly and the casing has a noise reduction expansion structure near the wall and a flow guiding expansion structure away from the wall. Because the fan is tilted at a certain angle, the wide flow channel side area of ​​the fan inlet is further away from the air inlet of the chassis, which is conducive to the airflow of the fan inlet. The noise reflected by the noise reduction expansion structure has a certain phase angle with the noise direction of the fan, thus canceling out some of the noise energy. Since the expansion direction of the flow guiding expansion structure is towards the interior space of the kitchen, the airflow turning angle becomes larger, the flow loss is reduced, the tail edge separation vortex is weakened, and the effective flow area is increased, which can further improve the performance of the fan.

[0003] For fans with a dual-suction volute design, a portion of the airflow needs to be separated at the main inlet to bypass the fan and enter the auxiliary inlet. In the overlapping area between the main and auxiliary inlet channels, this airflow is simultaneously subjected to suction from both inlets, easily forming vortices. The airflow at the main inlet becomes highly turbulent, reducing both main and auxiliary inlet efficiency. In addition to reduced overall efficiency, the fan's operating state changes with the environment, leading to instability in the main and auxiliary inlet states, worsening intake conditions, and consequently, increased noise in some situations. Some of the fan motor's work is wasted, resulting in reduced main inlet efficiency and lower intake volume. If the flue environment changes, such as increased exhaust resistance, the fan motor spends a significant amount of time overcoming this resistance, leaving less effective work for intake. Suction at both the main and auxiliary inlets also decreases, increasing turbulence. With the speed setting unchanged, reduced intake volume and increased speed result in increased noise. To draw in the same volume of air, the motor needs to do more work, and its power and speed also need to be increased. This results in higher noise levels and a poor user experience. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a range hood that can adjust the air intake volume of the main air inlet of the fan, in light of the above-mentioned existing technology.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a range hood, comprising an upper housing and a lower housing, wherein a horizontally arranged range hood fan is installed inside the upper housing, the range hood fan is a centrifugal fan and has a lower air inlet and an upper air inlet, and the lower housing has a smoke inlet chamber, characterized in that: the lower air inlet is the main air inlet, the upper air inlet is the auxiliary air inlet, a fan cover is installed at the bottom of the upper housing, the fan cover has a ventilation opening corresponding to the lower air inlet, the ventilation opening is connected to the smoke inlet chamber through a duct, a diverter pipe is installed at the lower air inlet, the lower end of the diverter pipe forms an air inlet port, an air inlet gap is formed between the diverter pipe and the fan cover, which is connected to the upper air inlet, and the diameter of the air inlet port of the diverter pipe is adjusted by an adjustment mechanism.

[0006] Preferably, the air inlet port of the diversion pipe is located between the lower air inlet of the fume extractor and the ventilation opening of the fan cover plate, and the diameter of the air inlet port of the diversion pipe is smaller than the diameter of the lower air inlet and the diameter of the ventilation opening.

[0007] To ensure smoother airflow, both the air inlet and the vent are circular, and the air inlet is located directly above the vent.

[0008] In order to fix the diversion pipe to the lower air inlet of the range hood, an air inlet ring is installed at the lower air inlet of the range hood, and the upper end of the diversion pipe is fixed to the air inlet ring.

[0009] In order to adjust the diameter of the air inlet port of the split pipe, the split pipe is a flexible component, and the adjustment mechanism is used to adjust the air inlet port of the split pipe to open outward or close inward.

[0010] The adjustment mechanism can have various structures. Preferably, a fixing ring is installed at the bottom of the fan cover, and the top of the air duct is fixed to the fixing ring. The adjustment mechanism includes a motor, a first lead screw, and a second lead screw. The first and second lead screws are cross-shaped and installed on the fixing ring. The first and second lead screws rotate under the drive of the motor. The threads at both ends of the first lead screw have opposite directions, and the threads at both ends of the second lead screw have opposite directions. A first support plate is threaded onto the threads at both ends of the first lead screw, and a second support plate is threaded onto the threads at both ends of the second lead screw. The lower end of the diverter pipe is fixed to the first and second support plates.

[0011] To ensure that the air inlet of the diverter remains circular during adjustment, two motors are installed on a fixed ring, and the first lead screw and the second lead screw rotate synchronously under the drive of their respective motors.

[0012] To enable intelligent adjustment of the air inlet port of the splitter duct, a pressure sensor is installed inside the duct, and a controller is also included. The controller can receive the output signal of the pressure sensor and control the motor accordingly based on the received signal.

[0013] Further preferably, the impeller centerline of the oil fume extractor is a vertical straight line.

[0014] Compared with the prior art, the advantages of the present invention are as follows: the range hood has a lower air inlet and an upper air inlet. The fan cover at the bottom of the upper housing has a ventilation opening corresponding to the lower air inlet. The lower end of the diversion pipe at the lower air inlet forms an air inlet port. The flow rate at this location is distributed by adjusting the diameter of the air inlet port of the diversion pipe through an adjustment mechanism, thereby increasing the air volume at the main air inlet of the range hood, reducing the turbulence area of ​​the airflow at the main air inlet, improving the main air intake efficiency, increasing the effective work of the fan motor, improving the smoke exhaust situation, and reducing the noise of the range hood. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a range hood according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 The diagram shown is a schematic of the internal structure of the range hood.

[0017] Figure 3 for Figure 1 The diagram shows another internal structure of the range hood.

[0018] Figure 4 This is a schematic diagram of the upper housing of the range hood according to an embodiment of the present invention;

[0019] Figure 5 for Figure 4 The diagram shows the internal structure of the upper box.

[0020] Figure 6 for Figure 4 The diagram shows another internal structure of the upper box. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] like Figures 1 to 6As shown, the range hood in this embodiment includes an upper housing 1 and a lower housing 2. The upper housing 1 is installed inside the kitchen ceiling, and a range hood 3 is installed inside the upper housing 1. The range hood 3 is a horizontally arranged centrifugal fan, meaning that the central axis of the impeller of the range hood 3 is a vertical line. The range hood has a lower air inlet 31 and an upper air inlet 32, wherein the lower air inlet 31 is the main air inlet and the upper air inlet 32 ​​is the auxiliary air inlet. A fan cover 4 is installed at the bottom of the upper housing 1, and a ventilation opening 41 corresponding to the lower air inlet 31 is opened on the fan cover 4. The lower housing 2 has a smoke inlet chamber 21, and the ventilation opening 41 is connected to the smoke inlet chamber 21 through a duct 5. After the fumes are drawn into the smoke inlet chamber 21, they flow from bottom to top through the duct 5 and enter the range hood 3 through the lower air inlet 31 and the upper air inlet 32.

[0023] A diversion pipe 6 is installed at the lower air inlet 31. Specifically, an air inlet ring 33 is installed at the lower air inlet 31 of the range hood 3, and the upper end of the diversion pipe 6 is fixed to the air inlet ring 33. The lower end of the diversion pipe 6 forms an air inlet port, which is located between the lower air inlet 31 of the range hood 3 and the ventilation opening 41 of the fan cover 4. The diameter of the air inlet port of the diversion pipe 6 is smaller than the diameter of the lower air inlet 31, and the diameter of the air inlet port of the diversion pipe 6 is smaller than the diameter of the ventilation opening 41. In this embodiment, both the air inlet port and the ventilation opening 41 are circular, and the air inlet port is located directly above the ventilation opening 41.

[0024] An air inlet gap 7 is formed between the diverter pipe 6 and the fan cover plate 4, and the air inlet gap 7 is connected to the upper air inlet 32. In this embodiment, the diverter pipe 6 is a flexible component. If an elastic-plastic material is used, the diameter of its air inlet port can be adjusted by the adjustment mechanism 8. In this embodiment, the adjustment mechanism 8 adjusts the air inlet diameter by adjusting the air inlet port of the diverter pipe 8 to open outward or close inward, and at the same time, the air inlet gap 7 is adjusted synchronously. When the diameter of the air inlet port of the diverter pipe 6 increases, the air inlet gap 7 decreases, and vice versa.

[0025] In this embodiment, a fixing ring 9 is installed at the bottom of the fan cover plate 4, and the top of the air duct 5 is fixed to the fixing ring 9. The adjusting mechanism 8 includes a motor 80, a first lead screw 81, and a second lead screw 82. The first lead screw 81 and the second lead screw 82 are cross-shaped and installed on the fixing ring 9. There are two motors 80 installed on the fixing ring 9. The first lead screw 81 and the second lead screw 82 rotate synchronously under the drive of their respective motors 80. The threads at both ends of the first lead screw 81 have opposite directions, and the threads at both ends of the second lead screw 82 have opposite directions. A first support plate 83 is threaded onto the threads at both ends of the first lead screw 81, and a second support plate 84 is threaded onto the threads at both ends of the second lead screw 82. The lower end of the diversion pipe 6 is fixed to the first support plate 83 and the second support plate 84. Taking the rotation of the first lead screw 81 as an example, driven by the motor 80, the first lead screw 81 rotates, and the first support plate 83 moves back and forth on the first lead screw 81. Since the threads at both ends of the first lead screw 81 rotate in opposite directions, the two first support plates 83 move in opposite directions. Because the air inlet of the diverter pipe 6 is connected to the first support plate 83, the diameter of the air inlet of the diverter pipe 6 can be adjusted as the first support plate 83 moves. The second lead screw 82 rotates synchronously with the first lead screw 81, and the first support plate 83 and the second support plate 84 can move synchronously, thereby realizing the adjustment of the diameter of the air inlet of the diverter pipe 8. Since the diverter pipe is made of a material with elasticity and plasticity, it can deform when the support plates move to adapt to the increase or decrease of the diameter of the air inlet.

[0026] In addition, a pressure sensor 10 is installed inside the duct 5, and a controller is also included. The controller can receive the output signal of the pressure sensor 10 and control the motor 80 accordingly based on the received signal. The pressure sensor 10 can obtain the pressure of the oil fume airflow and calculate the flow rate from the pressure.

[0027] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A range hood, comprising an upper housing (1) and a lower housing (2), wherein a horizontally arranged range hood fan (3) is installed inside the upper housing (1), the range hood fan (3) being a centrifugal fan and having a lower air inlet (31) and an upper air inlet (32), and the lower housing (2) having a smoke inlet chamber (21), characterized in that: The lower air inlet (31) is the main air inlet, and the upper air inlet (32) is the auxiliary air inlet. A fan cover (4) is installed at the bottom of the upper housing (1). A ventilation opening (41) corresponding to the lower air inlet (31) is opened on the fan cover (4). The ventilation opening (41) is connected to the smoke inlet chamber (21) through the air duct (5). A diversion pipe (6) is installed on the lower air inlet (31). The lower end of the diversion pipe (6) forms an air inlet port. An air inlet gap (7) is formed between the diversion pipe (6) and the fan cover (4) and is connected to the upper air inlet (32). The diameter of the air inlet port of the diversion pipe (6) is adjusted by the adjustment mechanism (8).

2. The range hood according to claim 1, characterized in that: The air inlet of the diversion pipe (6) is located between the lower air inlet (31) of the fume extractor (3) and the ventilation opening (41) of the fan cover (4). The diameter of the air inlet of the diversion pipe (6) is smaller than the diameter of the lower air inlet (31) and the diameter of the air inlet of the diversion pipe (6) is smaller than the diameter of the ventilation opening (41).

3. The range hood according to claim 2, characterized in that: Both the air inlet and the ventilation opening (41) are circular, and the air inlet is located directly above the ventilation opening (41).

4. The range hood according to claim 1, characterized in that: The lower air inlet (31) of the fume extractor (3) is equipped with an air inlet ring (33), and the upper end of the diversion pipe (6) is fixed on the air inlet ring (33).

5. The range hood according to claim 1, characterized in that: The diversion pipe (6) is a flexible component, and the adjustment mechanism (8) is used to adjust the air inlet port of the diversion pipe (6) to open outward or contract inward.

6. The range hood according to claim 5, characterized in that: A fixing ring (9) is installed at the bottom of the fan cover plate (4), and the top of the air duct (5) is fixed on the fixing ring (9). The adjusting mechanism (8) includes a motor (80), a first lead screw (81) and a second lead screw (82). The first lead screw (81) and the second lead screw (82) are cross-shaped and installed on the fixing ring (9). The first lead screw (81) and the second lead screw (82) rotate under the drive of the motor (80). The threads at both ends of the first lead screw (81) are opposite in direction, and the threads at both ends of the second lead screw (82) are opposite in direction. A first support plate (83) is threaded onto the threads at both ends of the first lead screw (81), and a second support plate (84) is threaded onto the threads at both ends of the second lead screw (82). The lower end of the diversion pipe (6) is fixed on the first support plate (83) and the second support plate (84).

7. The range hood according to claim 6, characterized in that: There are two motors (80) mounted on a fixed ring (9), and the first lead screw (81) and the second lead screw (82) rotate synchronously under the drive of their respective motors (80).

8. The range hood according to claim 6, characterized in that: A pressure sensor (10) is installed inside the air duct (5), and a controller is also included. The controller can receive the output signal of the pressure sensor (10) and control the motor (80) accordingly based on the received signal.

9. The range hood according to claim 1, characterized in that: The impeller centerline of the oil fume fan (3) is a vertical line.

Images