Mining pneumatic pressurizing anti-explosion axial flow fan

Abstract

The utility model provides a mining pneumatic pressurizing anti-explosion axial flow fan, which relates to the technical field of fans in anti-explosion occasions, and particularly comprises a flow guide cone air inducing cover, a fan blade assembly, an air barrel, a force bearing connecting barrel, a pneumatic motor and an air outlet pressurizing flow guide cover, and the flow guide cone air inducing cover consists of an outer ring guide ring, a central flow guide cone and a connecting bracket; the flow guide cone air inducing cover is fixedly connected with the air barrel and can be provided with a protective net, the air barrel is provided with a support and a center fixing flange which are fixedly connected, the fixing flange is used for installing the force bearing connecting barrel, the air barrel is provided with a circle of copper ring which is fixedly connected with the air barrel within the range that the rotating width of fan blades is larger than 1.1 times, and the fan blade assembly is installed on an output shaft at the front end of the force bearing connecting barrel; compared with the prior art; the utility model is researched and developed for solving the problems that a blade type pneumatic motor cannot directly bear axial force, the resistance at the air inlet center is large, and a multi-stage fan combination burns the motor, and the problems are effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of fan technology, specifically relating to a mine-use pneumatic booster explosion-proof axial flow fan. Background Technology

[0002] Electric explosion-proof fans employ special explosion-proof materials and structural designs, enabling them to operate safely in flammable and explosive environments and effectively preventing explosions caused by sparks and other factors. However, explosion-proof motors must meet strict explosion-proof standards and specifications, employing special design and manufacturing processes, thus typically resulting in higher costs compared to ordinary motors, and making maintenance more difficult. In contrast, pneumatic explosion-proof fans strictly adhere to industry explosion-proof standards during design, ensuring safe operation in flammable and explosive environments. Their pneumatic drive method avoids electrical sparks that may be generated by electrical equipment, fundamentally eliminating the potential for explosions.

[0003] However, in traditional pneumatic fans, the blades are usually mounted directly on the motor output shaft. Since pneumatic motors generally cannot withstand radial forces, this direct mounting will affect the service life of the motor.

[0004] In current applications of axial flow fans, to increase pressure and for use in ventilation systems with long conveying distances or high system resistance, multi-stage combinations are often employed, typically designed as series or counter-rotating structures. However, in ordinary motor-driven counter-rotating fans, the airflow at the first-stage outlet is counter-rotating. When cascaded with the next stage fan, it is difficult to ensure consistent rotation direction and pressure. This can cause excessive load on the next stage motor, leading to motor burnout. Utility Model Content

[0005] The purpose of this utility model is to provide a mining pneumatic booster explosion-proof axial flow fan and fan assembly that can both ensure the service life of the motor and increase the conveying air pressure.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is a mine-use pneumatic booster explosion-proof axial flow fan, including a guide cone hood, a fan blade assembly, a fan casing, a load-bearing connecting casing, a pneumatic motor, and an outlet booster guide hood.

[0007] The aforementioned guide cone air hood consists of an outer guide ring, a central guide cone, and a connecting bracket. The guide cone air hood is fixedly connected to the air duct, and the guide cone air hood may be equipped with a protective net.

[0008] The wind tunnel has a fixed bracket and a central fixed flange. The fixed flange is used to install the load-bearing connecting tube. The wind tunnel has a copper ring fixed to it within a range where the fan blade rotation width is greater than 1.1 times. Support feet can be installed on the outside of the wind tunnel.

[0009] The fan blade assembly is installed on the output shaft at the front end of the load-bearing connecting barrel. A screw hole is provided at the center of the front end of the load-bearing connecting barrel. The rotation direction of the screw hole thread is opposite to that of the fan blade, which plays a role in preventing loosening when the fan starts. The load-bearing connecting barrel consists of a connecting barrel shell, a rotating shaft, a front bearing, a rear bearing, and a retaining ring. The inner ring of the bearing is fixedly connected to the shaft, and the outer ring of the bearing is fixedly connected to the connecting barrel shell.

[0010] Furthermore, a sound-absorbing guide cover can be installed on the central mounting bracket of the air duct; a pressure regulating air source treatment valve is installed on the outside of the air duct, the pressure regulating air source treatment valve is connected to the air inlet pipeline, and the outlet is connected to the air inlet of the pneumatic motor through a pipeline.

[0011] Furthermore, the pneumatic motor can be replaced with a pneumatic geared motor to achieve greater torque.

[0012] Furthermore, a noise-reducing shroud can be installed on the central support to reduce operating noise.

[0013] Furthermore, the pneumatic motor outlet can be directly discharged or equipped with a silencer.

[0014] Furthermore, in applications requiring high pressure, the fan can be stacked and combined in a manner where the fan of the next stage rotates in the opposite direction to that of the previous stage. Multiple stages can be stacked, and the two stages can be directly connected or a flow guide transition barrel can be added.

[0015] Furthermore, the air outlet pressure boosting guide shroud has a curved guide vane structure, with the concave surface of the guide vane facing the direction of air outlet rotation. The guide vane can be a curve or a combination of curves (including straight lines).

[0016] Furthermore, the air outlet pressure boosting guide shroud has a guide vane with an angle between 0 and 40 degrees and the axis of the air duct. The angle can be the same or gradually increase from the center outwards, and the angle is tilted backwards in the direction of the air vane rotation.

[0017] Furthermore, the air guide cone and air outlet guide are a better combination and can be replaced with a protective mesh cover or a structure that also includes a protective mesh cover.

[0018] Furthermore, the output shaft drive can be a key drive, or it can be a square shaft, flat shaft, or spline shaft drive.

[0019] Compared with the prior art, the beneficial effects of this utility model are: reasonable design and simple structure. The load-bearing connecting barrel is used to bear the axial and radial forces generated by the rotation of the fan blades, thereby avoiding the pneumatic motor being directly subjected to force and thus improving the service life of the pneumatic motor.

[0020] Meanwhile, an air intake hood with a guide cone is installed on the front side of the air duct to improve air intake efficiency and reduce efficiency loss caused by turbulence. An air outlet pressure boosting guide hood with an arc shape is installed on the air outlet side to optimize the air outlet direction guidance and further increase the air outlet pressure, making the air outlet more conducive to long-distance transportation.

[0021] In applications requiring high air pressure output, a multi-stage forward and reverse superposition combination can improve the conveying air pressure. Each stage is equipped with a pressure regulating control valve, which can better match the torque between stages and is more suitable for long-distance conveying in mines. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the cross-sectional structure of the fan body of this utility model;

[0023] Figure 2 This is a schematic diagram of the flow guide cone shroud structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the air outlet pressure boosting guide shroud structure of this utility model;

[0025] Figure 4 This is a cross-sectional schematic diagram of the two-level superimposed combination state of this utility model;

[0026] Figure 5 This is a front view schematic diagram of the two-level superimposed combination state of this utility model;

[0027] Figure 6 This is a front view schematic diagram of the three-level superimposed combination state of this utility model;

[0028] Figure 7 This is a front view schematic diagram of the four-level superimposed combination state of this utility model;

[0029] Among them, 1-air duct, 2-air guide cone hood, 21-outer ring guide, 22-center cone guide, 23-support, 3-pneumatic motor, 4-outlet pressure boosting hood, 41-outlet guide ring, 42-guide vane, 5-output shaft, 6-fan blade assembly, 7-load-bearing connecting barrel, 71-connecting barrel housing, 72-front bearing, 73-rear bearing, 8-copper ring, 9-silencing hood, 10-pressure regulating air source treatment valve. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. It should be understood that the preferred embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model. In the embodiments, the components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0031] See Figures 1 to 7 As shown, a mine-use pneumatic booster explosion-proof axial flow fan includes a fan body, which includes a guide cone shroud 2, a duct 1, a pneumatic motor 3, and an outlet booster shroud 4. The pneumatic motor 3 is located inside the duct 1, and the duct 1 has mounting support feet on its exterior. The guide cone shroud 2 and the outlet booster shroud 4 are respectively connected to the front and rear ends of the duct 1. The pneumatic motor 3 is connected to a fan blade assembly 6 via an output shaft 5. The fan blade assembly 6 is located inside the duct. When the pneumatic motor 3 is working, it drives the fan blade assembly 6 to rotate. At this time, external gas enters the duct 1 through the guide cone shroud 2 and flows towards the outlet booster shroud 4. Finally, after being pressurized by the outlet booster shroud 4, it flows out.

[0032] The guide cone hood 2 includes an outer guide ring 21 and a central guide cone 22. The central guide cone can be a frustum, hemisphere, or semi-ellipse. The outer guide ring 21 is trumpet-shaped, with one end diameter larger than the other, and its larger diameter end extends into a circular arc towards the smaller diameter end. The smaller diameter end of the outer guide ring 21 is fixedly connected to the end of the air duct 1. The central guide cone 22 is located at the center of the outer guide ring 21, and the two are coaxially arranged. The central guide cone 22 is connected to the outer guide ring 21 or the air duct 1 via a bracket 23. When the pneumatic motor 3 is started, a negative pressure is generated at the small diameter end of the outer guide ring 21. The surrounding air flows into the air duct 1 under the action of the pressure difference. The central guide cone 22 can rectify the incoming airflow. Without the central guide cone 22, the airflow may collide or swirl when entering the guide cone hood 2. The central guide cone 22 can guide the airflow to flow along the axial direction of the outer guide ring 21, so that the airflow is more concentrated and flows to the small diameter end, thereby improving the efficiency of the ventilation system.

[0033] A load-bearing connecting barrel 7 is installed inside the air duct 1. The load-bearing connecting barrel 7 is connected to the air duct 1 via a bracket. The open end of the load-bearing connecting barrel 7 is connected to the pneumatic motor 3. An output shaft 5 passes through the load-bearing connecting barrel 7. The rear end of the output shaft 5 is connected to the output part of the pneumatic motor 3. After passing through the load-bearing connecting barrel 7, the front end of the output shaft 5 is connected to the fan blade assembly 6. A screw hole is provided at the center of the front end of the load-bearing connecting barrel. The rotation direction of the screw hole thread is opposite to the rotation direction of the fan blade. When the pneumatic motor 3 is working, it can drive the fan blade assembly 6 to rotate through the output shaft 5, thereby generating airflow towards the outlet pressure guide shroud 4. It should be noted that at this time, a copper ring 8 is connected to the inner wall of the air duct 1. The copper ring 8 and the fan blade assembly 6 are on the same vertical plane, and the cross-sectional area of ​​the area enclosed by the copper ring 8 is more than 1.1 times the area covered by the fan blade assembly 6 when it rotates.

[0034] The aforementioned load-bearing connecting barrel 7 consists of a connecting barrel housing 71, a front bearing 72, a rear bearing 73, and a retaining ring. The inner ring of the bearing is fixedly connected to the output shaft 5, and the outer ring of the bearing is fixedly connected to the connecting barrel housing 71. The arrangement of the front and rear bearings ensures that the output shaft 5 can rotate smoothly.

[0035] In addition, a silencer shroud 9 can be installed inside the air duct 1. The silencer shroud 9 is fitted onto the pneumatic motor 3. A pressure regulating air source treatment valve 10 is installed outside the air duct 1. The pressure regulating air source treatment valve is connected to the air inlet pipe. The outlet of the air inlet pipe is connected to the air inlet of the pneumatic motor 3. The outlet of the pneumatic motor 3 can be directly discharged or a silencer can be installed. At this time, compressed air is delivered into the pneumatic motor 3 through the air inlet pipe.

[0036] To optimize the airflow direction guidance, the aforementioned airflow booster shroud 4 includes an airflow guide ring 41, which is connected to the end of the air duct 1. Several guide vanes 42 are connected to the airflow guide ring 41. Each guide vane 42 extends radially along the airflow guide ring 41, and one end of the guide vane 42 is located at the center of the airflow guide ring 41. A concave groove is provided on the guide vane 42, which extends along the length of the guide vane 42. The concave groove of the guide vane 42 faces the airflow direction. The guide vane 42 can be curved, straight, or a combination of curved and straight lines.

[0037] The angle between the guide vane 42 and the central axis of the air duct 1 is between 0 and 40 degrees. When the guide vane 42 extends in a straight line, the angle is a constant value. When the guide vane 42 extends in a curved shape, the angle gradually increases from the center of the air duct 1 outwards. Furthermore, the angle of the guide vane 42 is tilted backwards in the direction of rotation of the guide vane 42. This backward tilting design helps to increase the efficiency of airflow.

[0038] In the specific implementation process, the air guide cone hood 2 and the air outlet hood 4 can also be replaced with protective net covers or structures that also have protective net covers.

[0039] In applications requiring high pressure, the fan body can be combined in series. In this case, the fan blade assembly in the subsequent stage rotates in the opposite direction to the fan blade assembly in the previous stage. Multiple stages can be stacked, but the two stages can be directly connected or a flow guide transition barrel can be added to ensure stability.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to an electrical connection; they can refer to a hydraulic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be primarily defined by the scope of the claims.

Claims

1. A mine-use pneumatic booster explosion-proof axial flow fan, characterized in that: Includes air guide cone shroud, fan blade assembly, fan casing, load-bearing connecting casing, pneumatic motor, and air outlet pressurization guide shroud; The aforementioned guide cone air hood consists of an outer guide ring, a central guide cone, and a connecting bracket. The guide cone air hood is fixedly connected to the air duct, and the guide cone air hood may be equipped with a protective net. The wind tunnel has a fixed bracket and a central fixed flange. The fixed flange is used to install the load-bearing connecting tube. The wind tunnel has a copper ring fixed to it within a range where the fan blade rotation width is greater than 1.1 times. The wind tunnel has mounting support feet on the outside. The fan blade assembly is installed on the output shaft at the front end of the load-bearing connecting barrel. A screw hole is provided at the center of the front end of the load-bearing connecting barrel. The rotation direction of the screw hole thread is opposite to that of the fan blade. This serves to prevent loosening during fan startup and operation. The load-bearing connecting barrel consists of a connecting barrel shell, a rotating shaft, a front bearing, a rear bearing, and a retaining ring. The inner ring of the bearing is fixedly connected to the shaft, and the outer ring of the bearing is fixedly connected to the connecting barrel shell.

2. The mine pneumatic booster explosion-proof axial flow fan according to claim 1, characterized in that: A sound-absorbing guide hood can be installed on the central mounting bracket of the air duct; a pressure regulating air source treatment valve is installed on the outside of the air duct, the pressure regulating air source treatment valve is connected to the air inlet pipeline, and the outlet is connected to the air inlet of the pneumatic motor through a pipeline; the air source treatment valve can be removed when the air source is good.

3. The mine pneumatic booster explosion-proof axial flow fan according to claim 1, characterized in that: The pneumatic motor can be replaced with a pneumatic geared motor to achieve greater torque.

4. The mine pneumatic booster explosion-proof axial flow fan according to claim 1, characterized in that: The pneumatic motor outlet can be either directly discharged or equipped with a silencer.

5. The mine pneumatic booster explosion-proof axial flow fan according to claim 1, characterized in that: In applications requiring high pressure, the fan can be stacked and combined in a way that the direction of the fan in the next stage is opposite to that of the previous stage. Multiple stages can be stacked, and the two stages can be directly connected or a flow guide transition barrel can be added.

6. The mine pneumatic booster explosion-proof axial flow fan according to claim 1, characterized in that: The air outlet pressurization guide shroud has a curved guide vane structure, with the concave surface of the guide vane facing the direction of rotation of the air outlet fan blade. The guide vane can be a curve or a combination of curves and straight lines.

7. The mine pneumatic booster explosion-proof axial flow fan according to claim 6, characterized in that: The air outlet pressure boosting guide shroud has a guide vane with an angle between 0 and 40 degrees and the axis of the air duct. The angle can be the same or gradually increase from the center outwards. The angle is tilted backwards in the direction of the air vane rotation.

8. The mine pneumatic booster explosion-proof axial flow fan according to claim 1, characterized in that: The output shaft drive is a key drive, but it can also be a square shaft, flat shaft, or spline shaft drive.

9. The mine pneumatic booster explosion-proof axial flow fan according to claim 1, characterized in that: The central guide cone of the aforementioned air hood can be a frustum, a hemisphere, or a semi-elliptical structure.

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