Low-noise mixed flow fan

Abstract

The utility model discloses a low-noise mixed flow fan in the technical field of fans, which comprises a shell, the shell is provided with an air inlet and an air outlet, the shell is cylindrical, a motor is arranged in the shell, an output rotating shaft of the motor faces the air inlet and coincides with the axis of the shell, and the output rotating shaft of the motor is provided with a backward-tilting centrifugal impeller. A partition plate is arranged in the machine shell and divides the inner space of the machine shell into a first cavity and a second cavity, the motor is arranged in the second cavity, an output rotating shaft of the motor penetrates out of the partition plate to enter the first cavity, the backward-tilting centrifugal impeller is arranged in the first cavity, and the size of the backward-tilting centrifugal impeller is matched with the size of the first cavity. An air guide groove parallel to the axis of the machine shell is formed in the side, away from the second cavity, of the partition plate, the end, close to the partition plate, of the air guide groove communicates with the first cavity, and the peripheral side of the air guide groove is isolated from the second cavity. The mixed flow fan structure is designed by combining the shapes of the centrifugal fan impeller and the axial flow fan, the shell structure is effectively utilized, and both the air volume and the air pressure performance are considered.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field especially relates to a low noise mixed flow fan. BACKGROUND

[0002] With the acceleration of urbanization, the existing large air volume or large power fan is used for fast cooling or precipitation operation in grain depot, especially in "city warehouse", which has the problems of large noise, low energy efficiency and easy to be complained in ventilation operation, which not only cannot meet the current environmental protection requirements, but also affects the normal operation of storage.

[0003] The existing fan of grain depot mostly adopts centrifugal fan or axial flow fan, and the fan noise reduction scheme mostly adopts the mode of adding soundproof box, which embeds the fan in the soundproof box, in the prior art, the centrifugal fan has large air volume and pressure, but also has large noise, and the axial flow fan has large air volume but small pressure, which is only suitable for daily slow cooling ventilation, and it is difficult to balance the pressure, air volume and noise. UTILITY MODEL CONTENTS

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the utility model is how to ensure that the fan reduces noise while improving air pressure and air volume.

[0005] The utility model adopts the technical scheme that:

[0006] A low noise mixed flow fan, comprising a shell, the shell is provided with an air inlet and an air outlet, the shell is cylindrical, a motor is arranged in the shell, the output rotating shaft of the motor is directed to the direction of the air inlet and coincides with the axis of the shell, the output rotating shaft of the motor is provided with a backward inclined centrifugal impeller, a partition plate is arranged in the shell, the partition plate divides the internal space of the shell into a first cavity and a second cavity, the motor is arranged in the second cavity, the output rotating shaft of the motor penetrates through the partition plate and enters the first cavity, the backward inclined centrifugal impeller is arranged in the first cavity, and the size of the backward inclined centrifugal impeller matches the size of the first cavity.

[0007] Further, the air guide groove is arranged on the inner wall of the shell, and the inner wall of the shell corresponding to the position where the air guide groove communicates with the first cavity is arranged to be inclined.

[0008] Further, the U-shaped plate is arranged along the length direction of the shell, and the two ends of the U-shaped plate are connected to the inner wall of the shell, and the inner space formed by the U-shaped plate and the shell forms the air guide groove.

[0009] Further, the air guide grooves are arranged in multiple, and the multiple air guide grooves are arranged uniformly along the circumference of the casing.

[0010] Further, the inner diameters of the air inlet and the air outlet are same and are smaller than the inner diameter of the middle part of the casing.

[0011] Further, the walking vehicle body is arranged, and the upper end of the walking vehicle body is linked to the bottom end of the casing.

[0012] Further, the bottom end of the walking vehicle body is provided with a fixing leg.

[0013] Further, the inner wall of the casing is provided with a wave-shaped porous sound absorption plate, and the inner wall of the casing and the wave-shaped porous sound absorption plate are filled with sound absorption material.

[0014] The beneficial effects of the utility model are as follows:

[0015] When working, the rear inclined centrifugal impeller rotates to suck air into the first cavity through the air inlet and guide the air to the air outlet through the air guide groove, forming the air inlet and air outlet design of the same axis, combining the mixed flow fan structure of the centrifugal fan impeller and the axial flow fan appearance design, specifically, the rear inclined centrifugal blade of the centrifugal fan sucks air from the air inlet, and then discharges the air along the radial direction through the centrifugal force, similarly, the rear inclined centrifugal blade of the mixed flow fan rotates to suck air from the air inlet, and the air flows radially under the action of the centrifugal force, thereby increasing the air pressure, and then the air is discharged from the air outlet after being guided by the casing and the air guide groove in the horizontal direction, and the appearance is similar to the axial flow fan, generally being a horizontal straight cylinder, which can effectively utilize the casing structure, take into account the air volume and air pressure performance, reduce the noise and size. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is the front view of the utility model;

[0017] Fig. 2 is the left view of the utility model;

[0018] Fig. 3 is the right view of the utility model;

[0019] In the figure, 1 is a casing, 2 is a rear inclined centrifugal impeller, 3 is a motor, 4 is an air inlet, 5 is an air outlet, 6 is a partition plate, 7 is an air guide groove, 8 is a fixing leg, 9 is a walking vehicle body, 10 is sound absorption material, and 11 is a U-shaped plate. DETAILED DESCRIPTION

[0020] The utility model will be further described below in combination with the drawings.

[0021] According to the utility model, the rear inclined centrifugal impeller is arranged in the casing, the motor is arranged in the casing, the air inlet is arranged on the casing, the air outlet is arranged on the casing, the partition plate is arranged in the casing, the air guide groove is arranged in the casing, the walking vehicle body is arranged, the bottom end of the walking vehicle body is provided with the fixing leg, the inner wall of the casing is provided with the wave-shaped porous sound absorption plate, and the inner wall of the casing and the wave-shaped porous sound absorption plate are filled with the sound absorption material. Figs. 1-3As shown, the embodiment of the present application proposes a low-noise mixed-flow fan, which comprises a casing 1, the casing 1 is provided with an air inlet 4 and an air outlet 5, the inner diameters of the air inlet 4 and the air outlet 5 are the same and are smaller than the inner diameter of the middle part of the casing 1, the casing 1 is a cylindrical shape, the casing 1 is provided with a motor 3, the motor 3 can adopt a permanent magnet synchronous motor to improve the energy efficiency of the fan; the motor 3 is built-in in the casing, which can take into account the rainproof while making full use of the space, and can help the motor to continuously dissipate heat; the motor 3 is also equipped with a communication interface, which can be integrated with the existing grain condition monitoring system of the grain depot, and the fan can be automatically started and stopped according to the ventilation demand; the output shaft of the motor 3 is directed to the direction of the air inlet 4 and coincides with the axis of the casing 1, the output shaft of the motor 3 is provided with a backward-inclined centrifugal impeller 2, the casing 1 is provided with a partition plate 6, the partition plate 6 divides the internal space of the casing 1 into a first cavity and a second cavity, the motor 3 is arranged in the second cavity, the output shaft of the motor 3 penetrates through the partition plate 6 into the first cavity, the backward-inclined centrifugal impeller 2 is arranged in the first cavity, and the size of the backward-inclined centrifugal impeller 2 matches the size of the first cavity; the side of the partition plate 6 facing the second cavity is provided with a wind guide groove 7 which is parallel to the axis of the casing 1, one end of the wind guide groove 7 close to the partition plate 6 is communicated with the first cavity, the peripheral side of the wind guide groove 7 is isolated from the second cavity, so as to avoid the dispersion of airflow and cause the air pressure to be reduced, and the other end of the wind guide groove 7 away from the first cavity is opened and directed to the air outlet 5.

[0022] First of all, it needs to be pointed out that during work, the backward-inclined centrifugal impeller 2 rotates to suck air into the first cavity through the air inlet 4 and then guide the air to the air outlet 5 through the wind guide groove 7, forming the design of the air inlet 4 and the air outlet 5 on the same axis, combining the structure of the mixed-flow fan with the design of the centrifugal fan impeller 2 and the axial flow fan shape, specifically, the centrifugal blades of the centrifugal fan suck air from the air inlet, and then discharge the air along the radial direction through the centrifugal force, similarly, the backward-inclined centrifugal blades 2 of the mixed-flow fan rotate to suck air from the air inlet 4, the air flows radially under the action of the centrifugal force, and the wind pressure increases to flow from the air outlet 5 after being guided by the casing 1 and the wind guide groove 7; in terms of shape, it is similar to the axial flow fan, generally horizontal and straight cylindrical, the air inlet 4 and the air outlet 5 are on the same axis, taking into account the air volume and wind pressure performance, reducing noise while reducing the size.

[0023] Specifically, the wind guide groove 7 is arranged on the inner wall of the casing, and the inner wall of the casing corresponding to the position where the wind guide groove 7 is communicated with the first cavity is arranged obliquely, that is, the wind guide groove 7 guides the airflow in the first cavity to the peripheral side of the casing, which can ensure that the gathered airflow enhances the wind pressure and reduces the kinetic energy loss of the airflow, and the airflow in the first cavity smoothly transitions into the wind guide groove 7 from the obliquely arranged inner wall of the casing, further ensuring sufficient wind pressure and air volume.

[0024] Further comprising a U-shaped plate 11, the U-shaped plate 11 is arranged along the length direction of the shell 1, and the two ends of the U-shaped plate 11 are connected to the inner wall of the shell 1. The inner space formed by the U-shaped plate 11 and the shell 1 forms the air guide groove 7.

[0025] In order to ensure the air volume, the air guide groove 7 is arranged in multiple, and the multiple air guide grooves 7 are arranged uniformly along the circumferential direction of the shell 1. During operation, the airflow in the first cavity uniformly enters the multiple air guide grooves 7, thereby achieving the effect of increasing the air volume.

[0026] In addition, the embodiment also provides a walking vehicle body 9, and the upper end of the walking vehicle body 9 is connected to the bottom end of the shell 1. The walking vehicle body 9 can be a trolley or an intelligent remote-controlled automatic driving vehicle. The walking vehicle body 9 is arranged to facilitate the movement of the whole fan to a specified position. In order to facilitate the fixation of the fan, the bottom end of the walking vehicle body 9 is provided with a fixing support 8. Specifically, the fixing support 8 comprises an automatic lifting support structure arranged at the lower end of the walking vehicle body 9. The lifting support structure can lift the ground to make the walking vehicle body 9 suspended, thereby achieving the effect of supporting and positioning. Specifically, the lifting support structure can be a hydraulic lifting structure or a mechanical screw lifting structure. The direct member at the lower end can be a plurality of support columns arranged uniformly at the lower end of the walking vehicle body 9.

[0027] In order to further improve the noise reduction performance of the fan, the inner wall of the shell 1 is provided with a wave-shaped porous sound-absorbing plate, and the inner wall of the shell 1 and the wave-shaped porous sound-absorbing plate are filled with sound-absorbing material 10. The sandwich structure can greatly reduce the operating noise.

[0028] The utility model discloses a low -noise mixed -flow fan, including casing 1, the casing 1 is equipped with air inlet 4 and air outlet 5, the casing 1 is cylindrical, be provided with motor 3 in the casing 1, the output shaft of motor 3 is towards air inlet 4 direction and coincides with the axis of casing 1, the output shaft of motor 3 is provided with backward inclined centrifugal impeller 2, the casing 1 is provided with baffle 6, baffle 6 divides the inside space of casing 1 into first cavity and second cavity, motor 3 sets up in second cavity, the output shaft of motor 3 passes baffle 6 and enters first cavity, backward inclined centrifugal impeller 2 sets up in first cavity, and the size of backward inclined centrifugal impeller 2 and the size of first cavity are matched, baffle 6 is provided with air guide groove 7 parallel with the axis of casing 1 away from the side towards second cavity, the one end of air guide groove 7 close to baffle 6 is communicated with first cavity, the circumference of air guide groove 7 is isolated with second cavity, the one end of air guide groove 7 away from first cavity is open and towards air outlet 5, effectively utilize casing 1 structure, give consideration to air volume and wind pressure performance, reduce the size of noise at the same time, and air inlet 5 is convenient for connecting pipeline or can increase silencer to further reduce noise, fan is equipped with communication interface, and it is convenient to with existing measurement and control system integration integration.

Claims

1. A low noise mixed flow fan characterized by, The application relates to a centrifugal fan, which comprises a casing (1) provided with an air inlet (4) and an air outlet (5), wherein the casing (1) is cylindrical, a motor (3) is arranged in the casing (1), the output rotating shaft of the motor (3) is directed towards the air inlet (4) and coincides with the axis of the casing (1), the output rotating shaft of the motor (3) is provided with a backward-inclined centrifugal impeller (2), a partition plate (6) is arranged in the casing (1) and divides the internal space of the casing (1) into a first cavity and a second cavity, the motor (3) is arranged in the second cavity, the output rotating shaft of the motor (3) penetrates through the partition plate (6) and enters the first cavity, the backward-inclined centrifugal impeller (2) is arranged in the first cavity and the size of the backward-inclined centrifugal impeller (2) matches the size of the first cavity, and a wind guide groove (7) parallel to the axis of the casing (1) is arranged on the side of the partition plate (6) facing the second cavity, one end of the wind guide groove (7) close to the partition plate (6) is communicated with the first cavity, the circumferential side of the wind guide groove (7) is isolated from the second cavity, and the other end of the wind guide groove (7) far away from the first cavity is opened and directed towards the air outlet (5).

2. A low noise mixed flow fan as claimed in claim 1, wherein The wind guide groove (7) is arranged on the inner wall of the casing (1), and the inner wall of the casing (1) corresponding to the position communicated with the first cavity is arranged in an inclined mode.

3. A low noise mixed flow fan as claimed in claim 2, wherein A U-shaped plate (11) is arranged along the length direction of the casing (1), and the two ends of the U-shaped plate (11) are connected to the inner wall of the casing (1), and the inner space formed by the U-shaped plate (11) and the casing (1) forms the wind guide groove (7).

4. A low noise mixed flow fan as claimed in claim 3, wherein A plurality of wind guide grooves (7) are uniformly arranged along the circumferential direction of the casing (1).

5. A low noise mixed flow fan as claimed in claim 1, wherein, The inner diameters of the air inlet (4) and the air outlet (5) are the same and smaller than the inner diameter of the middle part of the casing (1).

6. A low noise mixed flow fan as claimed in claim 1, wherein, A walking vehicle body (9) is arranged, and the upper end of the walking vehicle body (9) is connected to the bottom end of the casing (1).

7. A low noise mixed flow fan as claimed in claim 6, wherein Fixed supporting legs (8) are arranged at the bottom end of the walking vehicle body (9).

8. A low noise mixed flow fan as claimed in claim 1, wherein, Wavy porous sound-absorbing plates are arranged on the inner wall of the casing (1), and sound-absorbing materials (10) are filled between the inner wall of the casing (1) and the wavy porous sound-absorbing plates.

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