Range hood

Abstract

A horizontally-arranged oil smoke suction fan is installed in an upper box body, the oil smoke suction fan is a centrifugal fan and is provided with a lower air inlet and an upper air inlet, the lower box body is provided with a smoke inlet cavity, the lower air inlet is a main air inlet, the upper air inlet is an auxiliary air inlet, and a fan cover plate is installed at the bottom of the upper box body. A ventilation opening corresponding to the lower air inlet is formed in the fan cover plate and communicated with the smoke inlet cavity through an air pipe, a flow dividing pipe is installed at the lower air inlet, an air inlet port is formed in the lower end of the flow dividing pipe, and an air inlet gap communicated with the upper air inlet is formed between the flow dividing pipe and the fan cover plate. And the caliber of the air inlet end opening of the flow dividing pipe is adjusted through an adjusting mechanism. According to the range hood, the flow dividing pipe is mounted at the lower air inlet of the oil smoke suction fan, and the flow is distributed by adjusting the caliber of the air inlet port of the flow dividing pipe through the adjusting mechanism, so that the air inlet amount of the main air inlet of the oil smoke suction fan is increased, the turbulent flow area of airflow at the position is reduced, the main air inlet efficiency is improved, and the noise of the oil smoke suction fan is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oil fume purification, and in particular to a range hood. Background Art

[0002] At present, the fans of range hoods installed in suspended ceilings on the market are mainly installed in a flat position, with the fan air inlet facing the direction of the airflow. For fans with a single-suction volute, the fan air inlet faces vertically downward, and the airflow directly enters the fan, such as the "A Range Hood" published in the Chinese invention patent application with application number 202211368741.6 (application publication number CN 115682068 A). The range hood includes a fan assembly and a pipeline assembly, the fan assembly includes a chassis and a fan obliquely arranged in the chassis, the chassis is provided with a chassis air inlet, the pipeline assembly is connected to the chassis, the inner cavity of the pipeline assembly is connected to the chassis, and the connection between the pipeline assembly and the chassis is provided with a noise reduction outward expansion structure close to the wall and a flow diversion outward expansion structure away from the wall. As the fan is tilted at a certain angle, the wide flow channel side area of ​​the fan inlet is farther away from the chassis inlet, which is beneficial to the air flow at the fan inlet. There is a certain phase angle between the noise direction reflected by the noise reduction expansion structure and the noise direction of the fan, thereby offsetting part of the noise energy. As the expansion direction of the guide expansion structure is toward the internal space of the kitchen, the airflow turning angle becomes larger, the flow loss is reduced, the trailing 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 double-suction volutes, since the airflow needs to be separated at the main air inlet and bypass the fan to enter the auxiliary air inlet, in the middle overlap area of ​​the main air inlet and the auxiliary air inlet flow channel, this part of the airflow is simultaneously subject to the suction from the main inlet and the auxiliary air inlet, and vortices are easily formed here. The flow of the airflow at the main air inlet is very turbulent, which not only reduces the efficiency of the main air inlet, but also reduces the efficiency of the auxiliary air inlet. While reducing the overall efficiency, since the working state of the fan will change with the environment, the main and auxiliary air inlet states of the fan will be unstable, the air inlet conditions will deteriorate, and in some cases, there will be a problem of high noise. Part of the work done by the fan motor will be wasted, which will cause the main air inlet efficiency to decrease and the air intake volume to decrease. If the environment in the flue changes, such as the increase of smoke exhaust resistance, at this time, the fan motor will spend a lot of work on overcoming the terminal resistance, and the effective work for air intake will be less. The suction at the main air inlet and the auxiliary air inlet will also decrease, and the turbulent area will increase. When the gear does not change, the air intake volume decreases, the speed also increases, and the noise will increase. If the same amount of wind is to be introduced, the motor work must be increased, and the motor power / speed must also be increased. In this case, the noise is loud and the user experience is not good. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a range hood capable of adjusting the air intake volume of the main air inlet of the fan in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a range hood comprising an upper box body and a lower box body, a horizontally arranged range hood fan is installed inside the upper box body, the range hood fan is a centrifugal fan and has a lower air inlet and an upper air inlet, the lower box body has a smoke inlet chamber, and is characterized in that: the lower air inlet is a main air inlet, the upper air inlet is an auxiliary air inlet, a fan cover is installed at the bottom of the upper box body, a ventilation hole corresponding to the lower air inlet is formed on the fan cover plate, the ventilation hole is connected with the smoke inlet chamber through an air duct, and a diverter pipe is installed at the lower air inlet, an air inlet port is formed at the lower end of the diverter pipe, an air inlet gap connected to the upper air inlet is formed between the diverter pipe and the fan cover plate, and the caliber of the air inlet port of the diverter pipe is adjusted by an adjusting mechanism.

[0006] Preferably, the air inlet port of the diverter pipe is arranged between the lower air inlet of the range hood fan and the vent of the fan cover, the diameter of the air inlet port of the diverter pipe is smaller than the diameter of the lower air inlet, and the diameter of the air inlet port of the diverter pipe is smaller than the diameter of the vent.

[0007] In order to make the air intake smoother, the air inlet port and the vent are both circular ports, and the air inlet port is arranged directly above the vent.

[0008] In order to fix the diverter pipe to the lower air inlet of the range fumes exhaust fan, the lower air inlet of the range fumes exhaust fan is equipped with an air inlet ring, and the upper end of the diverter pipe is fixed on the air inlet ring.

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

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

[0011] In order to ensure that the air inlet port of the shunt pipe always remains circular when the regulating mechanism is adjusted, there are two motors installed on the fixing ring, and the first screw rod and the second screw rod rotate synchronously under the drive of their respective corresponding motors.

[0012] In order to realize intelligent adjustment of the air inlet port of the shunt pipe, a pressure sensor is installed in the air duct, and a controller is also included. The controller can receive the output signal of the pressure sensor and control the motor accordingly according to the received signal.

[0013] Further preferably, the central axis of the impeller of the range fumes exhaust fan is a vertical line.

[0014] Compared with the prior art, the advantages of the present invention are: the range hood fan of the range hood has a lower air inlet and an upper air inlet, the fan cover at the bottom of the upper box body is provided with a vent corresponding to the lower air inlet, and the lower end of the diverter pipe at the lower air inlet forms an air inlet port, and the flow rate here is distributed by adjusting the aperture size of the air inlet port of the diverter pipe through an adjusting mechanism, thereby increasing the air intake volume of the main air inlet of the range hood fan, reducing the turbulent area of ​​the air flow at the main air inlet, improving the main air intake efficiency, increasing the effective work of the fan motor, improving the smoke exhaust condition, and reducing the noise of the range hood fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 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 internal structure diagram of the range hood shown;

[0017] Figure 3 for Figure 1 Another schematic diagram of the internal structure of the range hood shown;

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

[0019] Figure 5 for Figure 4 The internal structure diagram of the upper box body shown;

[0020] Figure 6 for Figure 4 Another schematic diagram of the internal structure of the upper box is shown. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings.

[0022] like Figures 1 to 6As shown, the range hood of this embodiment includes an upper box body 1 and a lower box body 2. The upper box body 1 is installed in the kitchen ceiling. A range hood fan 3 is installed inside the upper box body 1. The range hood fan 3 is a horizontally arranged centrifugal fan, that is, the central axis of the impeller of the range hood fan 3 is a vertical line. The range hood fan has a lower air inlet 31 and an upper air inlet 32, wherein the lower air inlet 31 is a main air inlet and the upper air inlet 32 ​​is an auxiliary air inlet. A fan cover plate 4 is installed at the bottom of the upper box body 1, and a vent 41 corresponding to the lower air inlet 31 is opened on the fan cover plate 4. The lower box body 2 has a smoke inlet cavity 21, and the vent 41 is connected to the smoke inlet cavity 21 through an air duct 5. After the smoke is sucked into the smoke inlet cavity 21, it flows from bottom to top through the air duct 5 and enters the range hood fan 3 from the lower air inlet 31 and the upper air inlet 32.

[0023] The lower air inlet 31 is provided with a shunt pipe 6. Specifically, the lower air inlet 31 of the range fumes fan 3 is provided with an air inlet ring 33, and the upper end of the shunt pipe 6 is fixed on the air inlet ring 33. The lower end of the shunt pipe 6 forms an air inlet port, and the air inlet port of the shunt pipe 6 is arranged between the lower air inlet 31 of the range fumes fan 3 and the vent 41 of the fan cover 4. The diameter of the air inlet port of the shunt pipe 6 is smaller than the diameter of the lower air inlet 31, and the diameter of the air inlet port of the shunt pipe 6 is smaller than the diameter of the vent 41. The air inlet port and the vent 41 of this embodiment are both circular ports, and the air inlet port is arranged directly above the vent 41.

[0024] An air inlet gap 7 is formed between the shunt pipe 6 and the fan cover plate 4, and the air inlet gap 7 is connected to the upper air inlet 32. The shunt pipe 6 of this embodiment is a flexible member, such as an elastic-plastic material, and the diameter of its air inlet port is adjusted by the adjustment mechanism 8. The adjustment mechanism 8 of this embodiment adjusts the air inlet diameter by adjusting the air inlet port of the shunt pipe 8 to open outward or contract inward, and at the same time, the air inlet gap 7 is also adjusted synchronously. When the diameter of the air inlet port of the shunt pipe 6 becomes larger, the air inlet gap 7 becomes smaller, and conversely, when the diameter of the air inlet port becomes smaller, the air inlet gap 7 becomes larger.

[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 on the fixing ring 9. The adjustment mechanism 8 includes a motor 80, a first screw rod 81 and a second screw rod 82. The first screw rod 81 and the second screw rod 82 are cross-shaped and installed on the fixing ring 9. There are two motors 80 and they are installed on the fixing ring 9. The first screw rod 81 and the second screw rod 82 rotate synchronously under the drive of the corresponding motor 80. The two ends of the first screw rod 81 have opposite thread rotation directions, and the two ends of the second screw rod 82 have opposite thread rotation directions. The first support sheet 83 is threadedly connected to the threads at both ends of the first screw rod 81, and the second support sheet 84 is threadedly connected to the threads at both ends of the second screw rod 82. The lower end of the shunt tube 6 is fixed to the first support sheet 83 and the second support sheet 84. Taking the rotation of the first screw rod 81 as an example, under the drive of the motor 80, the first screw rod 81 rotates, and the first support piece 83 moves forward and backward on the first screw rod 81. Since the threads at both ends of the first screw rod 81 rotate in opposite directions, the two first support pieces 83 move in opposite directions. Since the air inlet port of the shunt tube 6 is connected to the first support piece 83, the diameter of the air inlet port of the shunt tube 6 can be adjusted as the first support piece 83 moves. The second screw rod 82 rotates synchronously with the first screw rod 81, and the first support piece 83 and the second support piece 84 can move synchronously, thereby realizing the diameter adjustment of the air inlet port of the shunt tube 8. Since the shunt tube is made of elastic-plastic material, it can be deformed when the support piece moves to adapt to the increase or decrease of the diameter of the air inlet port.

[0026] In addition, a pressure sensor 10 is installed in 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 according to the received signal. The pressure sensor 10 can obtain the pressure of the oil smoke airflow when it flows, and calculate the flow rate from the pressure.

[0027] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" 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), wherein the range hood fan (3) is a centrifugal fan and has a lower air inlet (31) and an upper air inlet (32), and wherein the lower housing (2) has 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 box body (1). A ventilation hole (41) corresponding to the lower air inlet (31) is opened on the fan cover (4). The ventilation hole (41) is connected to the smoke inlet chamber (21) through an air duct (5). The lower air inlet (31) is installed with a diverter pipe (6). The lower end of the diverter pipe (6) forms an air inlet port. An air inlet gap (7) connected to the upper air inlet (32) is formed between the diverter pipe (6) and the fan cover (4). The diameter of the air inlet port of the diverter pipe (6) is adjusted by an adjustment mechanism (8).

2. The range hood according to claim 1, characterized in that: The air inlet port of the diverter pipe (6) is arranged between the lower air inlet port (31) of the range hood fan (3) and the vent (41) of the fan cover (4); the diameter of the air inlet port of the diverter pipe (6) is smaller than the diameter of the lower air inlet port (31); and the diameter of the air inlet port of the diverter pipe (6) is smaller than the diameter of the vent (41).

3. The range hood according to claim 2, characterized in that: The air inlet port and the vent (41) are both circular ports, and the air inlet port is arranged directly above the vent (41).

4. The range hood according to claim 1, characterized in that: The lower air inlet (31) of the range fumes exhaust fan (3) is provided with an air inlet ring (33), and the upper end of the diverter pipe (6) is fixed on the air inlet ring (33).

5. The range hood according to claim 1, characterized in that: The diverter pipe (6) is a flexible member, and the regulating mechanism (8) is used to regulate the air inlet port of the diverter 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 adjustment mechanism (8) comprises a motor (80), a first screw rod (81) and a second screw rod (82). The first screw rod (81) and the second screw rod (82) are cross-shaped and installed on the fixing ring (9). The first screw rod (81) and the second screw rod (82) rotate under the drive of the motor (80). The threads at both ends of the first screw rod (81) are rotated in opposite directions, and the threads at both ends of the second screw rod (82) are rotated in opposite directions. The threads at both ends of the first screw rod (81) are both threadedly connected with a first support plate (83), and the threads at both ends of the second screw rod (82) are both threadedly connected with a second support plate (84). The lower end of the shunt 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 the fixing ring (9), and the first screw rod (81) and the second screw rod (82) rotate synchronously under the drive of their respective corresponding motors (80).

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

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

Images