Efficient low-noise combined local ventilator

Abstract

The utility model discloses a high-efficiency low-noise combined type local ventilator which comprises a plurality of ventilation main machines which are connected in series, each ventilation main machine comprises a barrel, a plurality of ventilation main machines and a plurality of ventilation main machines, the barrel is of a hollow barrel structure with the two ends open, the barrel comprises an inner barrel and an outer barrel which are coaxially arranged, and the space between the inner barrel and the outer barrel is filled with noise reduction materials; the motor is arranged in the inner cylinder and comprises a motor host, the motor host is coaxially connected with a hollow motor cylinder, an extension shaft of the motor extends out of the center of the electrode cylinder, and an impeller is mounted at the free end of the extension shaft; the axis direction of the projecting shaft is parallel to the axis direction of the cylinder body; the plurality of guide vanes are arranged on the outer wall of the electrode cylinder and are arranged in an annular array by taking the axis of the electrode cylinder as a center; the interior of a cylinder of each ventilation main machine is arranged in a penetrating mode. The included angle between the blade chord line of each guide blade on each ventilation main machine and the axial end face of the electrode cylinder, namely the mounting angle value of the guide blade is gradually reduced step by step. The problems that an existing ventilator is low in efficiency and large in gas flow loss are solved.

Description

[Technical field]

[0001] The utility model belongs to the technical field of ventilation equipment for mines, and in particular relates to a high-efficiency and low-noise combined local ventilator. [Background technology]

[0002] The existing multi-stage axial flow local fans include the multi-stage counter-rotating axial flow local fans of Novinco fans, the two-stage axial flow fans of Hubei University of Engineering, and the three-stage axial flow fans. Among them, the multi-stage counter-rotating axial flow local fans of Novinco fans use multiple counter-rotating impellers in series, and each impeller is directly driven by a motor. The counter-rotating axial flow impellers have higher pressure than ordinary axial flow impellers, but lower efficiency and higher noise. Hubei University of Engineering uses a single double-axle extension motor with a coupling to drive two or three impellers to operate simultaneously. Since the work done by each impeller is different, a single motor drive is prone to damage to the motor, and in the third stage, the first and second impellers are close, and the gas flow loss is large. [Contents of the utility model]

[0003] The utility model aims to provide a high-efficiency and low-noise combined local ventilator to solve the problems of low efficiency and large gas flow loss of existing ventilators.

[0004] The utility model adopts the following technical solution: a high-efficiency and low-noise combined local ventilator, comprising a plurality of ventilation main units connected in series, each of which comprises:

[0005] A cylinder body, which is a hollow cylinder structure with two ends open, and comprises an inner cylinder and an outer cylinder arranged coaxially, and a sound-absorbing material is filled between the inner cylinder and the outer cylinder;

[0006] A motor is arranged in the inner cylinder, comprising a motor main body, the motor main body is coaxially connected to a hollow motor cylinder, an extension shaft of the motor extends from the center of the electrode cylinder, an impeller is installed on the free end of the extension shaft; the axial direction of the extension shaft is parallel to the axial direction of the cylinder;

[0007] A plurality of guide vanes are arranged on the outer wall of the electrode cylinder and are arranged in a circular array with the axis of the electrode cylinder as the center;

[0008] The cylinder of each ventilation host is connected internally; the angle between the blade chord of each guide vane on each ventilation host and the axial end face of the electrode cylinder, that is, the installation angle of the guide vane, decreases step by step.

[0009] Furthermore, there are two ventilation main units, the installation angle of the ventilation main unit close to the gas inlet is α, and the installation angle of the other ventilation main unit is α-1.3°.

[0010] Furthermore, there are three ventilation main units, and the installation angles of the three main units are set to α, α-1.3° and α-1.7° in turn according to the direction of gas flow.

[0011] Furthermore, there are four ventilation main units, and the installation angles of the four main units are set to α, α-1.3°, α-1.7° and α-2° in turn according to the direction of gas flow.

[0012] Furthermore, a front silencer is provided at the front end of the ventilation main unit close to the gas inlet direction, and a rear silencer is provided at the rear end of the ventilation main unit close to the gas exhaust direction.

[0013] Furthermore, a flow collector is provided at the front end of the front muffler.

[0014] Furthermore, the impeller blades are airfoil-shaped blades.

[0015] The beneficial effects of the utility model are as follows: the utility model increases the number of fans in series, gradually increases the total pressure of the fans, and gradually increases the ventilation distance of the fans, while increasing the ventilation distance of the fans and improving the efficiency of the fans. In order to conform to the changing law of the air flow velocity gradient, the degree of the installation angle is designed to decrease step by step, which can improve the performance efficiency of the whole machine and reduce local air flow loss. Users can increase the number of fans according to the required air volume and ventilation distance, which has a wide range of applications and high efficiency.

Brief Description of the Drawings

[0016] Figure 1 This is a schematic diagram of the structure of a high-efficiency and low-noise combined local ventilator in two stages in series in the utility model;

[0017] Figure 2 It is a structural schematic diagram of the guide vane of the utility model.

[0018] Among them, 1. collector, 2. front muffler, 3. impeller, 4. motor cylinder, 5. guide vane, 6. motor main engine, 7. extended shaft, 8. rear muffler, 9. outer cylinder, 10. inner cylinder. [Specific implementation method]

[0019] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0020] The utility model provides a high-efficiency and low-noise combined local ventilator, comprising at least two ventilation main units connected in series, and the number of ventilation main units can be connected in multiple stages in series as required. Figure 1 This is a schematic diagram of a two-stage series structure, and the multi-stage series structure above the second level is analogous. The structural composition of each ventilation host is the same, including:

[0021] A cylinder, which is a hollow cylinder structure with two ends open, is composed of an inner cylinder 10 and an outer cylinder 9 arranged coaxially, and a sound-absorbing material is filled between the inner cylinder 10 and the outer cylinder 9. The sound-absorbing material is glass fiber cloth and glass wool, and the glass fiber cloth and glass wool are added to reduce the main engine airflow and motor noise radiated from the cylinder. Adjacent ventilation main engines are connected by flanges arranged on the outer cylinder 9.

[0022] A motor is arranged in the inner cylinder 10, which includes a motor main unit 6. The motor main unit 6 is coaxially connected to a hollow motor cylinder 4. The extension shaft 7 of the motor extends from the center of the electrode cylinder 4. An impeller 3 is installed on the free end of the extension shaft 7. The impeller 3 rotates with the rotation of the motor main unit 6; the axial direction of the extension shaft 7 is parallel to the axial direction of the cylinder.

[0023] A plurality of guide vanes 5 are arranged on the outer wall of the electrode cylinder 4 and are arranged in a circular array with the axis of the electrode cylinder 4 as the center. The guide vanes 5 not only guide the wind flow, but also support the motor. The guide vanes 5 are fixed and do not rotate with the rotation of the motor. Single-plate arc-shaped guide vanes are widely used.

[0024] The inside of the cylinder of each ventilation main unit is through-connected for the passage of gas.

[0025] The included angle between the blade chord line of each guide vane 5 on each ventilation main unit and the axial end surface of the electrode tube 4, that is, the installation angle of the guide vane decreases step by step along the flow direction of the airflow.

[0026] Since the motor resistance is large when the ventilation host is connected in series at multiple stages, if the installation angle of the guide vanes in each stage of the ventilation host is the same, it is very easy to overload the power of the first stage motor. In actual use, when the airflow passes through the multi-stage ventilation host, under the action of the impeller, the airflow speed will become faster and the pressure will become greater. In order to fit the law of the change of the airflow speed gradient, the degree of the installation angle is designed to decrease step by step, which can improve the performance efficiency of the whole machine and reduce local airflow losses.

[0027] In some embodiments, there are two ventilation main units, the installation angle of the ventilation main unit close to the gas inlet is α, and the installation angle of the other ventilation main unit is α-1.3°.

[0028] In some embodiments, there are three ventilation main units, and the installation angles of the three main units are set to α, α-1.3° and α-1.7° in sequence according to the direction of gas flow.

[0029] In some embodiments, there are four ventilation hosts, and the installation angles of the four hosts are set to α, α-1.3°, α-1.7° and α-2° in sequence according to the direction of gas flow.

[0030] In some embodiments, a front silencer 2 is provided at the front end of the ventilation main unit near the gas inlet direction, and a rear silencer 8 is provided at the rear end of the ventilation main unit near the gas outlet direction. The two silencers can reduce the noise of the fan.

[0031] In some embodiments, a flow collector 1 is provided at the front end of the front muffler 2. The flow collector can improve the efficiency of the whole machine.

[0032] In some embodiments, the blades of the impeller 3 are airfoil blades. Compared with single-plate blades, the blades of the impeller 3 are airfoil-shaped, which has high structural strength, more stable wind flow through the blades, reduced aerodynamic noise of the whole machine, wide high-efficiency area, and improved efficiency of the whole machine.

[0033] The working process of the utility model's high-efficiency and low-noise combined local ventilator is as follows: the airflow passes through the collector 1 and the front silencer 2 and enters each ventilation main unit connected in series, the airflow passes through the impeller 3 and the guide vane 5 of the previous ventilation main unit, and enters each subsequent ventilation main unit in turn, and finally passes through the rear silencer 8 and is finally transported to the working surface using a wind tube cloth.

[0034] The utility model increases the number of fans in series, gradually increases the total pressure of the fans, and gradually increases the ventilation distance of the fans, while increasing the ventilation distance of the fans and improving the efficiency of the fans. In order to fit the changing law of the air flow velocity gradient, the degree of the installation angle is designed to decrease step by step, which can improve the performance efficiency of the whole machine and reduce local air flow loss. Users can increase the number of fans according to the required air volume and ventilation distance, which has a wide range of applications and high efficiency.

Claims

1. A high-efficiency and low-noise combined local ventilator, characterized in that: It includes a plurality of ventilation hosts connected in series, each of which includes: A cylinder, which is a hollow cylinder structure with openings at both ends, and comprises an inner cylinder (10) and an outer cylinder (9) arranged coaxially, wherein a sound-absorbing material is filled between the inner cylinder (10) and the outer cylinder (9); a motor, arranged in the inner cylinder (10), comprising a motor main unit (6), the motor main unit (6) being coaxially connected to a hollow motor cylinder (4), a protruding shaft (7) of the motor protruding from the center of the motor cylinder (4), an impeller (3) being mounted on the free end of the protruding shaft (7); the axial direction of the protruding shaft (7) being parallel to the axial direction of the cylinder; A plurality of guide vanes (5) are arranged on the outer wall of the motor cylinder (4) and are arranged in a circular array with the axis of the motor cylinder (4) as the center; The cylinder of each ventilation main machine is provided with a through-hole; the angle between the blade chord of each guide vane (5) on each ventilation main machine and the axial end face of the motor cylinder (4), that is, the installation angle of the guide vane, decreases step by step along the flow direction of the airflow.

2. A high-efficiency and low-noise combined local ventilator as claimed in claim 1, characterized in that: There are two ventilation main units, the installation angle of the ventilation main unit close to the gas inlet is α, and the installation angle of the other ventilation main unit is α-1.3°.

3. A high-efficiency and low-noise combined local ventilator as claimed in claim 1, characterized in that: There are three ventilation main machines, and the installation angles of the three ventilation main machines are set to α, α-1.3° and α-1.7° in turn according to the direction of gas flow.

4. A high-efficiency and low-noise combined local ventilator as claimed in claim 1, characterized in that: There are four ventilation main machines, and the installation angles of the four ventilation main machines are set to α, α-1.3°, α-1.7° and α-2° in turn according to the direction of gas flow.

5. A high-efficiency, low-noise combined local ventilator as claimed in any one of claims 1 to 4, characterized in that: A front silencer (2) is provided at the front end of the ventilation main unit close to the gas inlet direction, and a rear silencer (8) is provided at the rear end of the ventilation main unit close to the gas outlet direction.

6. A high-efficiency and low-noise combined local ventilator as claimed in claim 5, characterized in that: A flow collector (1) is provided at the front end of the front muffler (2).

7. A high-efficiency, low-noise combined local ventilator as claimed in any one of claims 1 to 4, characterized in that: The blades of the impeller (3) are airfoil-shaped blades.

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