Low-noise cylindrical fan

Abstract

A silencing layer is arranged on the inner wall of a barrel, an impeller chamber of an impeller comprises an inlet barrel section and an outlet barrel section, an outer opening of the inlet barrel section is connected with the end face of an air inlet of the barrel, the inlet barrel section is in an inward closing barrel shape, an inner opening of the inlet barrel section is connected with the outlet barrel section, and blades of the impeller are arranged in the outlet barrel section. The outer circumference of the outlet cylinder section is an inner air port communicated with an inner cavity of the cylinder for air supply; an inner silencing structure is arranged on the outer circumferential wall, corresponding to the inner cavity of the barrel, of the inlet barrel section and is of an annular structure sleeving the outer circumference of the inlet barrel section, the outer side of the inner silencing structure is attached to the inner side of the end face of the air inlet of the barrel, and the diameter of the outer circumference of the inner silencing structure is not smaller than that of the outer circumference of the outlet barrel section. The fan is simple in structure, noise at the corner of the fan barrel and the impeller chamber can be effectively reduced, and the noise level of the whole fan is comprehensively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of fan, specifically a kind of low noise cylindrical fan. BACKGROUND

[0002] With the continuous progress of science and technology, the design of the ship is more and more fine, the performance is more and more optimized, and the technical index is higher and higher. Due to the sailing environment and the performance requirements of the ship itself, the ship has strong noise, which not only affects the health of the crew, but also may induce some psychological problems, so vibration reduction and noise reduction have attracted great attention in the shipbuilding industry and become an important aspect of technical research. The fan is one of the important components of the ship, which is indispensable, and the use amount is large. It is also the main source of noise of the ship, so there is an urgent need for low noise fan on the ship to improve the working environment of the crew and improve the working efficiency of the crew.

[0003] Currently, axial flow fans are widely used in mechanical ventilation on ships and platforms due to their easy installation, simple structure, and large air volume. However, as the air volume and pressure of the axial flow fan increase, the noise and vibration generated at the corner between the air inlet inside the impeller chamber and the outside of the impeller chamber will also increase significantly, and the noise is also high, which limits the use of the ship. SUMMARY

[0004] The utility model provides a kind of low noise cylindrical fan with simple structure, which can effectively reduce the noise at the corner of fan barrel and impeller chamber.

[0005] The technical scheme adopted by the utility model is as follows: a low noise cylindrical fan, comprising a barrel, an axial flow motor and an impeller, the axial flow motor is fixedly arranged in the inner cavity of the barrel on the barrel axis, the axial flow motor faces the impeller at the air inlet of the barrel, and an inner sound-absorbing layer is arranged on the inner wall of the barrel, characterized in that: the impeller chamber of the impeller comprises an inlet barrel section and an outlet barrel section, the outer opening of the inlet barrel section is connected to the end face of the air inlet of the barrel, the inlet barrel section is a barrel-shaped inward tapering section, the inner opening of the inlet barrel section is connected to the outlet barrel section, the blades of the impeller are arranged in the outlet barrel section, and the outer circumference of the outlet barrel section is an inner air inlet connected to the inner cavity of the barrel for air supply;An inner sound-absorbing structure is arranged on the outer circumferential wall of the barrel inner cavity corresponding to the inlet barrel section, the inner sound-absorbing structure is a ring-shaped structure sleeved on the outer circumference of the inlet barrel section, the outer side of the inner sound-absorbing structure is attached to the inner side of the end face of the air inlet of the barrel, and the outer circumference diameter of the inner sound-absorbing structure is not less than the outer circumference diameter of the outlet barrel section.

[0006] The inner sound-absorbing layer is arranged as a ring-shaped tapering structure extending to one side of the inner side of the end face of the air inlet of the barrel at the position corresponding to the inlet barrel section of the inner wall of the barrel.

[0007] The starting position of the ring-shaped tapering structure corresponds to the inner air inlet.

[0008] The starting position of the annular contraction structure corresponds to the inner air inlet close to the outer air inlet.

[0009] The axial flow motor is supported and connected in the inner cavity of the cylinder through the peripheral static pressure guide vane.

[0010] The blade of the impeller is a high-efficiency machine wing backward blade.

[0011] The sound-absorbing layer is a composite structure of a sound-absorbing cotton layer and a sound-absorbing hole plate layer.

[0012] The inner sound-absorbing structure comprises a sound-absorbing hole plate layer and a sound-absorbing cotton layer, the sound-absorbing cotton layer is arranged inside the sound-absorbing hole plate layer, and the outside of the sound-absorbing hole plate layer is attached to the inside of the end face of the cylinder air inlet.

[0013] The beneficial effects of the utility model are:

[0014] 1. The sound-absorbing layer is arranged on the inner wall of the cylinder, and the annular inner sound-absorbing structure is arranged at the corner between the end face inner wall of the air inlet and the inlet cylinder section of the impeller chamber, the inner angle of the annular inner sound-absorbing structure is a right angle, and the composite sound-absorbing structure of the sound-absorbing cotton layer and the sound-absorbing hole plate layer can eliminate the noise generated at the corner between the inner air inlet of the outlet cylinder section of the impeller chamber and the end face inner wall of the air inlet, and better achieve the noise reduction in the fan.

[0015] 2. The axial flow motor is adopted, the structure is simple, and the fan pressure expansion is facilitated, the dynamic pressure is converted into static pressure, the wind speed is reduced, and the noise is reduced.

[0016] 3. The motor adopts the guide vane as a support for fixing, the deflection energy of the fan is converted into the static pressure energy of the fan, one step of the fan static pressure efficiency is improved, and the airflow regeneration noise is reduced.

[0017] 4. The high-efficiency machine wing backward impeller is adopted, the impeller efficiency can reach more than 90%, the impeller efficiency is very high, the additional noise loss is reduced, and therefore the fan noise is low. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] In the drawing: the cylinder 1, the sound-absorbing layer 2, the annular contraction structure 3, the axial flow motor 4, the guide vane 5, the blade 6, the inlet cylinder section 7, the inner sound-absorbing annular structure 8, the outlet cylinder section 9, the inner air inlet 10. DETAILED DESCRIPTION

[0020] Further description is made below in combination with the drawings.

[0021] Figure 1As shown: a low-noise cylindrical fan, comprising a cylinder 1, a sound-absorbing layer 2, an axial flow motor 4, a guide vane 5, a blade 6, an inlet cylinder section 7, an inner sound-absorbing annular structure 8, and an outlet cylinder section 9. The axial flow motor 4 is fixedly arranged in the inner cavity of the cylinder 1 on the axis of the cylinder through the outer peripheral guide vane 5, the axial flow motor 4 faces the impeller towards the air inlet of the cylinder 1, the blade 6 of the impeller is arranged in the outlet cylinder section 9 of the impeller chamber, the outer periphery of the outlet cylinder section 9 is provided with an inner air inlet 10 for sending air to the inner cavity of the cylinder 1, the outer side of the outlet cylinder section 9 is connected to the inlet cylinder section 7, the outer mouth of the inlet cylinder section 7 is connected to the end face of the air inlet of the cylinder 1, the inlet cylinder section 7 is a tapered cylinder inward, the inlet cylinder section 7 is provided with an inner sound-absorbing annular structure 8 on the outer circumferential wall corresponding to the inner cavity of the cylinder 1, which is an annular structure sleeved on the outer periphery of the inlet cylinder section, the outer side of the inner sound-absorbing annular structure 8 is attached to the inner side of the end face of the air inlet of the cylinder 1, and the outer circumferential diameter of the inner sound-absorbing annular structure is not less than the outer circumferential diameter of the outlet cylinder section. The sound-absorbing layer 2 is arranged as a one-side annular constricted structure 3 extending to the inner side of the end face of the air inlet of the cylinder at the position corresponding to the inlet cylinder section 7 on the inner wall of the cylinder 1, and the starting position of the annular constricted structure 3 corresponds to the position of the outer mouth part of the inner air inlet.

[0022] On the basis of the embodiment, the blade of the impeller can be selected as a high-efficiency machine wing backward blade.

[0023] In the embodiment, the sound-absorbing layer 2 is a composite structure of a sound-absorbing cotton layer and a sound-absorbing hole plate layer. The inner sound-absorbing structure includes a sound-absorbing hole plate layer and a sound-absorbing cotton layer, the sound-absorbing cotton layer is arranged on the inner side of the sound-absorbing hole plate layer, and the outer side of the sound-absorbing hole plate layer is attached to the inner side of the end face of the air inlet of the cylinder.

Claims

1. A low-noise cylindrical fan, comprising a cylinder, an axial flow motor and an impeller, the axial flow motor being fixedly arranged in the inner cavity of the cylinder along the cylinder axis, the axial flow motor facing the impeller at the air inlet of the cylinder, and a sound-absorbing layer being arranged on the inner wall of the cylinder, characterized in that: The impeller chamber of the impeller comprises an inlet cylinder section and an outlet cylinder section, the inlet cylinder section is connected to the outer end surface of the air inlet of the cylinder body, the inlet cylinder section is inwardly tapered, the inlet cylinder section is connected to the outlet cylinder section, the blades of the impeller are arranged in the outlet cylinder section, and the outer circumference of the outlet cylinder section is an inner air inlet for communicating with the inner cavity of the cylinder body; the inner sound-absorbing structure is arranged on the outer circumferential wall of the inlet cylinder section corresponding to the inner cavity of the cylinder body, the inner sound-absorbing structure is a ring structure sleeved on the outer circumference of the inlet cylinder section, the outer side of the inner sound-absorbing structure is attached to the inner side of the air inlet end surface of the cylinder body, and the outer circumference diameter of the inner sound-absorbing structure is not less than the outer circumference diameter of the outlet cylinder section.

2. A low noise ducted fan as claimed in claim 1, wherein: The sound-absorbing layer is arranged as a ring-shaped contraction structure extending to one side of the inner side of the air inlet end surface of the cylinder body at the position corresponding to the inlet cylinder section of the inner wall of the cylinder body.

3. A low noise ducted fan as claimed in claim 2, wherein: The starting position of the ring-shaped contraction structure corresponds to the inner air inlet.

4. A low noise ducted fan as claimed in claim 2 or 3 wherein: The starting position of the ring-shaped contraction structure corresponds to the outer portion of the inner air inlet.

5. A low noise ducted fan as claimed in claim 1, wherein: The axial flow motor is supported and connected to the inner cavity of the cylinder body through the peripheral static pressure guide vane.

6. A low noise, cylindrical fan as claimed in claim 1, characterized in that: The blades of the impeller are high-efficiency airfoil backward blades.

7. A low noise ducted fan as claimed in claim 1 or 2, wherein: The sound-absorbing layer is a composite structure of a sound-absorbing cotton layer and a sound-absorbing hole plate layer.

8. A low noise, cylindrical fan as claimed in claim 1, characterized in that: The inner sound-absorbing structure comprises a sound-absorbing hole plate layer and a sound-absorbing cotton layer, the sound-absorbing cotton layer is arranged on the inner side of the sound-absorbing hole plate layer, and the outer side of the sound-absorbing hole plate layer is attached to the inner side of the air inlet end surface of the cylinder body.

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