CN110131182A - A central dual-axial flow centrifugal fan - Google Patents

Abstract

The invention discloses a middle-mounted double-axial-flow centrifugal fan which comprises a double-output-shaft motor, an air channel, a centrifugal impeller and a fan, wherein the double-output-shaft motor is arranged in the center of an air inlet of the air channel, and the centrifugal impeller and the fan which rotate coaxially are sequentially and respectively arranged along the output shaft directions of two sides of the double-output-shaft motor; the double-shaft motor is arranged in the middle of the air duct, and the impeller and the fan are matched, so that air enters from two sides of the air duct uniformly.

Description

A central dual-axial flow centrifugal fan

technical field

The invention relates to the field of range hood fans, in particular to a centrally mounted double-axial flow centrifugal fan.

Background technique

In the prior art, the fans currently used in range hoods are basically forward multi-blade centrifugal fans. The motor is fixed on one side of the air duct, the impeller is set on the motor shaft, and the impeller is driven by the motor to rotate. The impeller does work on the gas to make the gas obtain energy (Static pressure and kinetic energy), the airflow enters the impeller along the axial direction and is turned by the action of the centrifugal fan, and the airflow is discharged through the outlet of the fan in the radial direction under the action of centrifugal force. The structure of this kind of fan is basically the same among all manufacturers, and the homogeneity is serious, and the motor is fixed on one side of the air duct, occupying the air inlet area on one side of the air duct, which seriously affects the performance of the air duct.

Contents of the invention

Aiming at the problems existing in the prior art, the object of the present invention is to provide a central dual-axial flow centrifugal fan, which can make the air intake on both sides of the air duct uniform by arranging a dual-axis motor in the middle of the air duct and the cooperation of the impeller and the fan.

To achieve the above object, the technical scheme of the present invention is as follows:

A central dual-axis flow centrifugal fan, including a dual-output shaft motor, an air duct, a centrifugal impeller and a fan, the dual-output-shaft motor is arranged at the central position of the air inlet of the air duct, along the two sides of the dual-output shaft motor The centrifugal impeller and the fan that rotate coaxially are arranged in sequence in the direction of the output shaft of the motor.

Further, an air duct middle plate is provided in the middle of the air inlet of the air duct.

Further, the air duct middle plate divides the air duct into two halves as a whole.

Further, the double output shaft motor is fixed on the middle plate of the air duct.

Further, two identical centrifugal impellers are arranged symmetrically on the output shafts on both sides of the double output shaft motor, and the shaft disks of the centrifugal impellers are sleeved on the output shafts of the double output shaft motor.

Further, the fan is an axial flow fan, and two identical axial flow fans are arranged symmetrically on both output shafts of the dual output shaft motor, and are respectively arranged outside the air inlets on both sides of the air duct.

Further, the disc of the centrifugal impeller is provided with several fan blades along the radial direction, and the fan blades extend toward the outside of the air inlet of the air duct along the output shaft direction of the dual output shaft motor.

Further, the ends of the output shafts on both sides of the double output shaft motor are provided with caps.

Further, an air inlet ring is provided outside the air inlets on both sides of the air duct.

Further, the double output shaft motor is an outer rotor motor.

In the present invention, a central dual-axial flow centrifugal fan is provided, and a dual-output-shaft motor is arranged in the center of the air duct, and the centrifugal impellers and fans arranged on both sides of the motor in the air inlet of the air duct are driven by the motor to realize the air intake on both sides of the air duct. The air inlet is uniform, which reduces the influence of the motor on the air inlet on the side of the air duct, and improves the suction performance of the fan. The cooperation of the fan and the centrifugal impeller increases the negative pressure area of the air inlet of the air duct and increases the air inlet The range of smoke collection effectively improves the effect of oil fume under the premise of constant air volume; moreover, compared with a fan with a centrifugal impeller, the axial length of the centrifugal impeller is longer in the air inlet of the air duct, and the oil fume enters along the axial direction The back of the centrifugal impeller flows out in the radial direction, so that the effective utilization rate of the centrifugal impeller blades in the length direction is low. The top is shortened for smoother rotation. At the same time, during the working process of the fan, the oily fumes first pass through the fan, and the oily fume airflow collides with the fan blades to separate part of the oil. The oil fume is separated by the centrifugal impeller, which improves the grease separation degree of the fan.

In the preferred technical solution of the present invention, the fan adopts an axial flow fan, and the axial flow fan is arranged on the outside of the air inlet of the air duct. During the working process of the fan, the axial flow fan can further improve the smoke collecting ability of the fan, and the auxiliary centrifugal impeller will be more The oily fume is sucked into the air duct.

Description of drawings

Fig. 1 is an explosion diagram of the present invention;

Fig. 2 is a sectional view of the present invention.

Detailed ways

In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", " The orientation or positional relationship indicated by "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, It is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In order to clearly illustrate the design concept of the present invention, the present invention will be described below in conjunction with examples.

A central dual-axis flow centrifugal fan, including a dual-output shaft motor, an air duct, a centrifugal impeller and a fan, the dual-output-shaft motor is arranged at the central position of the air inlet of the air duct, along the two sides of the dual-output shaft motor The centrifugal impeller and the fan are respectively arranged in sequence in the direction of the output shaft.

In order to illustrate the technical solution in the present invention more clearly, the following will be described in the form of specific examples.

Embodiment one

As shown in Fig. 1 and Fig. 2, a kind of mid-mounted dual axial flow centrifugal fan includes a dual output shaft motor 8, an air duct 6, a centrifugal impeller and a fan, and the dual output shaft motor 8 is arranged on the side of the air duct 6 At the central position of the air inlet, along the direction of the output shafts on both sides of the double output shaft motor 8, the centrifugal impeller and the fan are respectively arranged in sequence.

In the above example, the present invention sets a central double-axial flow centrifugal fan, and sets a double-output-shaft motor 8 in the center of the air duct 6. In this example, the double-output-shaft motor 8 adopts an outer rotor motor, which is driven by the motor and installed in the air duct. The 4 left centrifugal impellers, the right centrifugal impellers 9 and the fan on both sides of the motor in the air inlet of 6 realize uniform air intake at the air inlets on both sides of the air duct 6, reducing the influence of the air inlet on one side of the air duct 6 from being affected by the motor, and improving the The suction performance of the fan, the cooperation between the fan and the centrifugal impeller, driven by the motor to rotate coaxially and at the same speed, increases the area of the negative pressure area of the air inlet of the air duct, and increases the smoke collection range of the air inlet. Under the premise, the effect of oil fume is effectively improved. And compared to the fan of a centrifugal impeller, the axial length of the centrifugal impeller is long in the air inlet of the air duct, and the oil smoke enters the centrifugal impeller along the axial direction and then flows out in the radial direction, so that the centrifugal impeller blade 9-2 is effective in the length direction. The utilization rate is low. After the two centrifugal impellers are provided, the effective utilization rate of the centrifugal impeller blades 9-2 in the length direction is improved, and the axial direction of the centrifugal impeller becomes shorter, and the rotation is more stable.

At the same time, during the working process of the fan, the oily fumes first pass through the fan, and the oily fume airflow collides with the fan blades to separate part of the oil. The oil fume is separated by the centrifugal impeller, which improves the grease separation degree of the fan.

As shown in Figure 1, the air duct middle plate 5 is welded and fixed in the air duct 6, the air duct middle plate 5 divides the air duct 6 into two halves as a whole, and the air duct middle plate 5 is provided at the central part of the air inlet of the air duct 6 for accommodating double The through hole of the output shaft motor 8, the double output shaft motor 8 is provided with four fixed protrusions in the circumferential direction, and the fixed protrusions are provided with threaded through holes, and the double output shaft motor 8 is fixed on the air duct middle plate 5 by a screw fixture. On the two output shafts of the double output shaft motor 8, a centrifugal impeller and an axial flow fan are sequentially installed in the axial direction, and the shaft discs 9-1 of the two identical centrifugal impellers are symmetrically sleeved on the output shafts on both sides of the double output motor 8 , the length of the blade 9-1 of the centrifugal impeller is half the width of the air inlet of the air duct 6; on the basis of the centrifugal impeller, a left axial fan 3 and a right axial fan 10 are symmetrically installed on the output shaft of the double output shaft motor 8 , the central part of the axial flow fan is sleeved on the output shaft, and the axial flow fan is integrally arranged on the outside of the air inlet on both sides of the air duct 6; two output shaft ends of the double output shaft motor 8 are symmetrically provided with two caps 2, The cap 2 fixes the axial fan and the centrifugal impeller on the output shaft of the motor, preventing the axial fan and the centrifugal impeller from rotating unstable or even falling off during the working process of the fan.

In the above example, the axial flow fan is arranged outside the air inlet of the air duct. During the working process of the fan, the axial flow fan can further improve the smoke collection ability of the fan, and assist the centrifugal impeller to suck more oil fume into the air duct 6 .

The casing outside the air inlet of the air duct 6 is provided with screw holes in the circumferential direction, and the air inlet ring 1 whose inner diameter is the same as that of the air inlet of the air duct is fixed on the outer housing of the air inlet of the air duct 6 by screws, and the centrifugal impeller The wheel disc is blocked in the air inlet of the air channel 6 to further ensure the stability of the rotation of the centrifugal impeller.

As shown in FIG. 1 , an air outlet is provided above the air duct 6 , and a check valve 7 is fixed in the air outlet by screws.

Embodiment two

A central dual-axial flow centrifugal fan, including a dual-output shaft motor 8, an air duct 6, a centrifugal impeller and a fan, the dual-output shaft motor 8 is arranged at the central position of the air inlet of the air duct 6, along the dual-output The direction of the output shaft on both sides of the shaft motor 8 is respectively provided with a centrifugal impeller and a fan in sequence, wherein, the disc of the centrifugal impeller is provided with four fan blades along the radial direction, and the fan blades are arranged along the dual output The output shaft of the shaft motor 8 extends toward the outside of the air inlet of the air duct.

In this embodiment, the fan and the centrifugal impeller are integrated. When the fan is working, the blades on the disc of the centrifugal impeller rotate to form a negative pressure area in the air inlets on both sides of the air duct 6, and are connected to the outer edge of the disc of the centrifugal impeller. The fan blades rotate with the rotation of the centrifugal impeller, and the fan formed by the four blades as a whole plays the role of expanding the negative pressure area in the air inlet of the air duct, which can increase the range of the fan's smoke collection and will dissipate it in the range hood shell. The oil fume is sucked into the air duct 6; similarly, the setting of these four fan blades can separate the oil in the oil fume first, assist the centrifugal impeller to separate the oil, and improve the oil separation degree of the fan.

It should be noted that, in addition to the specific examples given above, some of the structures may have different choices. For example, the motor of the present invention can also use other types of double output shaft motors in addition to the outer rotor motor; the connection and fixing method between the air duct middle plate and the air duct in the air duct can also be fixed by screw fasteners in addition to welding; etc. , and these are all that those skilled in the art can make based on their basic skills on the basis of understanding the idea of the present invention, so they will not be listed one by one here.

Finally, it can be understood that the above implementations are only exemplary implementations adopted to illustrate the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, without departing from the principle and essence of the present invention, various modifications and improvements can be made, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (10)

1. A kind of double axial flow centrifugal fan in the middle, it is characterized in that, comprises double output shaft motor, air duct, centrifugal impeller and fan, and described double output shaft motor is arranged on the central position of the air inlet of described air duct, along The centrifugal impeller and the fan that rotate coaxially are arranged in sequence in the direction of the output shafts on both sides of the double output shaft motor. 2. The mid-mounted dual-axial flow centrifugal fan according to claim 1, wherein an air duct middle plate is arranged in the middle of the air inlet of the air duct. 3. The mid-mounted dual-axial flow centrifugal fan according to claim 2, wherein the air duct middle plate divides the entire air duct into two halves. 4 . The centrally mounted dual axial flow centrifugal fan according to claim 3 , wherein the dual output shaft motor is fixed on the middle plate of the air duct. 5. The mid-mounted dual-axial flow centrifugal fan according to claim 1, wherein two identical centrifugal impellers are arranged symmetrically on the output shafts on both sides of the dual output shaft motor, and the centrifugal impellers The shaft disk is sleeved on the output shaft of the double output shaft motor. 6. The mid-mounted dual axial flow centrifugal fan according to claim 1, wherein the fan is an axial flow fan, and two identical axial flow fans are arranged symmetrically on both sides of the dual output shaft motor The output shafts are respectively arranged outside the air inlets on both sides of the air duct. 7. The central dual-axial flow centrifugal fan according to claim 1, wherein the disc of the centrifugal impeller is provided with several fan blades along the radial direction, and the fan blades are arranged along the dual output shafts. The output shaft of the motor extends toward the outside of the air inlet of the air duct. 8. The mid-mounted dual-axial flow centrifugal fan according to claim 1, characterized in that, the ends of the output shafts on both sides of the dual-output-shaft motor are provided with caps. 9. The mid-mounted dual-axial flow centrifugal fan according to claim 1, characterized in that, air inlet rings are arranged outside the air inlets on both sides of the air duct. 10. The mid-mounted dual-axial flow centrifugal fan according to claim 1, wherein the dual-output-shaft motor is an outer rotor motor.