Axial-flow exhaust fan

Abstract

This invention discloses an axial flow exhaust fan, comprising: a housing having a first space inside; an inner cylinder disposed in the first space and spaced apart from the housing, the inner cylinder having a second space inside; a plurality of connecting blades evenly distributed in the first space, connecting the housing and the inner cylinder; a motor disposed in the second space, connected to one end of the inner cylinder, with one end of the drive shaft on the motor extending out of the inner cylinder and into the first space; a main impeller disposed in the first space, connected to one end of the drive shaft, and spaced apart from the inner cylinder; and a heat dissipation and cooling assembly disposed between the housing, the inner cylinder, and the motor, for introducing cooling gas from outside the housing into the second space, the cooling gas circulating in the second space, and then circulating from the second space to the outside of the housing, to dissipate heat and cool the motor; thereby overcoming the technical problem of poor high-temperature resistance.

Description

Technical Field

[0001] This invention relates to the field of ventilation and smoke exhaust equipment technology, specifically to axial flow smoke exhaust fans. Background Technology

[0002] Axial flow smoke exhaust fans are the core equipment of building fire protection systems. They rely on the rotation of the impeller to generate axial airflow to achieve ventilation and smoke exhaust functions. Their core features are large flow rate, moderate air pressure, and small installation space requirements. They are widely used in shopping malls, office buildings, subway stations, industrial plants, tunnels and other occasions. In particular, the ambient temperature is usually high during smoke exhaust, so the high temperature resistance of the axial flow smoke exhaust fan itself is especially important. For example, when airflow of no less than 150°C passes through a subway section, the axial flow exhaust fan should be able to operate normally and continuously for 60 minutes without obvious swiping (swiping phenomenon for more than 5 minutes, which is a motor fault, such as abnormal friction or collision between the rotor and stator during motor operation), motor short circuit, or other abnormal phenomena. When airflow of no less than 250°C passes through the tunnel, the axial flow exhaust fan should be able to operate normally and continuously for 60 minutes without any obvious abnormalities such as rubbing or motor short circuit. In some special building settings, when airflow of no less than 280°C passes through, the axial flow exhaust fan should be able to operate normally and continuously for 30 minutes without any obvious abnormalities such as swirl or motor short circuit. However, traditional axial flow exhaust fans have the drawback of poor high-temperature resistance, which cannot meet the requirements of actual operating temperature and time, and poses safety hazards. Summary of the Invention

[0003] In view of the above-mentioned shortcomings in the related technologies, the purpose is to provide an axial flow exhaust fan to solve the technical problem of poor high temperature resistance in the related technologies; The technical solution to achieve the objective is: an axial flow exhaust fan, including: An outer casing, wherein the outer casing has a first space; An inner cylinder is disposed in the first space and spaced apart from the outer shell; the inner cylinder has a second space inside. Several connecting blades are evenly distributed in the first space, connecting the outer shell and the inner cylinder; A motor is located in the second space and connected to one end of the inner cylinder, with one end of the drive shaft on the motor extending out of the inner cylinder and into the first space; The main impeller is disposed in the first space, connected to one end of the drive shaft, and spaced apart from the inner cylinder; A heat dissipation and cooling component is disposed between the outer shell, the inner cylinder and the motor, for introducing cooling gas from outside the outer shell into the second space. The cooling gas circulates in the second space and then flows from the second space to the outside of the outer shell to dissipate heat and cool the motor.

[0004] Furthermore: the outer shell includes: a cylindrical shell, wherein the cylindrical shell has the first space at its middle position; Two flanges are symmetrically arranged, one flange is connected to one end of the cylindrical housing, and the other flange is connected to the other end of the cylindrical housing; Two supporting feet are symmetrically arranged on the outer wall of the cylindrical shell; And lifting rings, which are disposed on the outer wall of the cylindrical shell and opposite to the supporting feet.

[0005] Furthermore: the inner cylinder includes: a cylindrical body, the second space being located at the middle position of the cylindrical body, and the connecting leaf connecting the cylindrical body and the cylindrical shell; A first connecting end plate is disposed on one end of the cylindrical body, connecting the motor, and one end of the transmission shaft extends out of the first connecting end plate; And a second connecting end plate, which is disposed on the other end of the cylindrical body, and connected to the heat dissipation and cooling assembly.

[0006] Furthermore: the main impeller includes: an impeller body connected to one end of the drive shaft; Pressure plate; And a connecting piece, which is connected to the drive shaft and abuts against the pressure plate, the pressure plate pressing down on the impeller body.

[0007] Furthermore: the impeller body includes: a first bushing, which is connected to one end of the drive shaft; A hub is connected to the first bushing and surrounds the first bushing; Reinforcing ribs are attached to the wheel hub; And several first blades, evenly distributed on the outer wall of the hub.

[0008] Furthermore: the connecting element is a bolt.

[0009] Furthermore: the heat dissipation and cooling assembly includes: a ventilation impeller, disposed in the second space and connected to the other end of the drive shaft; An intake pipe assembly is disposed in the first space, with one end connected to the second connecting end plate and the other end connected to the outer casing; And an air outlet pipe is provided in the first space, spaced apart from the air inlet pipe assembly. One end of the air outlet pipe is connected to the cylindrical body and communicates with the second space, and the other end is connected to the outer shell.

[0010] Furthermore: the ventilation impeller includes: a second bushing, connected to the drive shaft; The rear cover is connected to the second bushing; The front cover is spaced apart from the rear cover and is close to the air intake pipe assembly; And several second blades, evenly distributed between the rear cover and the front cover.

[0011] Furthermore: the intake pipe assembly includes: a connecting plate connected to the second connecting end plate, the connecting plate having a through hole communicating with the second space; The bend in the pipe is connected to the connecting plate. The connecting pipe section is connected to the outer casing; And an intermediate pipe section, one end of which is connected to the bend pipe section, and the other end of which is inserted into the connecting pipe section.

[0012] Furthermore: the air outlet pipe is a section of circular pipe.

[0013] The above technical solution has the following beneficial effects: the axial flow exhaust fan, compared with related technologies, is equipped with a shell, inner cylinder, connecting blades, motor, main impeller and heat dissipation and cooling components; When in use, the motor in the inner cylinder starts, which drives the main impeller to rotate. The flue gas flows into the first space, passes through the inner cylinder and connecting blades, and is then discharged, thus achieving the purpose of smoke exhaust. At the same time, a heat dissipation and cooling component is installed between the outer shell, the inner cylinder and the motor. This component is used to introduce cooling gas from outside the outer shell into the second space. The cooling gas flows in the second space and then flows out of the second space to the outside of the outer shell to dissipate heat and cool the motor. This makes the motor's operation more stable and prevents obvious rubbing, short circuits and other problems, thus improving the motor's high temperature resistance. This overcomes the technical problem of poor high-temperature resistance and achieves a relatively good high-temperature resistance. Attached Figure Description

[0014] Figure 1 This is one of the schematic diagrams of the overall assembly structure; Figure 2 This is the second schematic diagram of the overall assembly structure; Figure 3 for Figure 1 or Figure 2 A partial sectional view; Figure 4 for Figure 3 The main view; Figure 5 This is a schematic diagram of the outer shell structure; Figure 6 A schematic diagram of the main wind turbine; Figure 7 This is a schematic diagram of the ventilation impeller. In the diagram: 10. Outer shell, 11. First space, 10-1. Cylindrical shell, 10-2. Flange, 10-3. Support leg, 10-4. Lifting ring, 20. Inner cylinder, 20-1. Cylindrical body, 20-2. First connecting end plate, 20-3. Second connecting end plate, 21. Second space, 30. Connecting blade, 40. Motor, 41. Drive shaft, 42. Junction box, 50. Main impeller, 50-1. Impeller body, 50-2. Pressure plate, 50-3. Connecting piece, 50-11 50-12. First bushing; 50-13. Hub; 50-14. Reinforcing rib; 50-15. First blade; 60. Heat dissipation and cooling assembly; 60-1. Ventilation impeller; 60-11. Second bushing; 60-12. Rear cover; 60-13. Front cover; 60-14. Second blade; 60-2. Inlet pipe assembly; 60-21. Connecting plate; 60-21-1. Through hole; 60-22. Bend section; 60-23. Connecting pipe section; 60-24. Intermediate pipe section; 60-3. Outlet pipe. Detailed Implementation

[0015] To make the content easier to understand, the following detailed description is provided with reference to specific embodiments and accompanying drawings; The axial flow exhaust fan solves the technical problem of poor high-temperature resistance in related technologies, achieving a relatively better high-temperature resistance. The overall concept is as follows: Implementation Method

[0016] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown; axial flow exhaust fan, including: 10 housing, wherein the housing 10 has a first space 11; An inner cylinder 20 is disposed in the first space 11 and spaced apart from the outer shell 10. The inner cylinder 20 has a second space 21 inside. Several connecting blades 30 are evenly distributed in the first space 11, connecting the outer shell 10 and the inner cylinder 20; A motor 40 is located in the second space 21 and is connected to one end of the inner cylinder 20. One end of the drive shaft 41 on the motor 40 extends out of the inner cylinder 20 and into the first space 11. The main impeller 50 is disposed in the first space 11, connected to one end of the drive shaft 41, and spaced apart from the inner cylinder 20; And a heat dissipation and cooling component 60 is disposed between the outer shell 10, the inner cylinder 20 and the motor 40, for introducing cooling gas from outside the outer shell 10 into the second space 21, the cooling gas circulates in the second space 21 and then circulates from the second space 21 to the outside of the outer shell 10 to dissipate heat and cool the motor 40; Specifically, during implementation, the motor 40 at the inner cylinder 20 starts, and the motor 40 drives the main fan impeller 50 to rotate. The flue gas flows into the first space 11, flows along the first space 11, and is discharged after passing through the inner cylinder 20 and the connecting blade 30 (e.g., Figure 4 (in the direction of the large arrow), the purpose of smoke exhaust is achieved. At the same time, a heat dissipation and cooling component 60 is provided. The heat dissipation and cooling component 60 is located between the outer shell 10, the inner cylinder 20 and the motor 40. It is used to introduce cooling gas (such as air) from outside the outer shell 10 into the second space 21. The cooling gas flows in the second space 21 and then flows from the second space 21 to the outside of the outer shell 10. As the cooling gas flows, it carries away the heat in the second space 21, dissipating heat and cooling the motor 40, making the motor 40 more stable in operation, and preventing obvious rubbing, short circuits and other problems. It also improves the high temperature resistance of the motor 40. Another implementation method: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown; in implementation, the outer shell 10 includes: a cylindrical shell 10-1, the cylindrical shell 10-1 having the first space 11 at its middle position; two flanges 10-2, symmetrically arranged, one flange 10-2 connected to one end of the cylindrical shell 10-1 and the other flange 10-2 connected to the other end of the cylindrical shell 10-1; two support legs 10-3, symmetrically arranged on the outer wall of the cylindrical shell 10-1; and a lifting ring 10-4, arranged on the outer wall of the cylindrical shell 10-1, opposite to the support legs 10-3; The cylindrical shell 10-1 is provided, with a first space 11 in the middle position, which is conducive to the installation of other components and also facilitates the flow of flue gas along the first space 11, thus achieving the purpose of smoke exhaust; Flange 10-2 is welded to cylindrical shell 10-1; The support foot 10-3 is welded to the cylindrical shell 10-1. The support foot 10-3 is provided to facilitate assembly with the installation foundation. For example, the connection with the installation foundation is made by bolts, which makes assembly relatively convenient. The installation of lifting rings 10-4 facilitates the hoisting of axial flow exhaust fans. Another implementation method: like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown; in implementation, the inner cylinder 20 includes: a cylindrical body 20-1, the cylindrical body 20-1 having a second space 21 at its middle position, the cylindrical body 20-1 being connected to the cylindrical shell 10-1 by the connecting leaf 30; a first connecting end plate 20-2, disposed on one end of the cylindrical body 20-1, connecting the motor 40, and one end of the drive shaft 41 extending out of the first connecting end plate 20-2; and a second connecting end plate 20-3, disposed on the other end of the cylindrical body 20-1, connecting the heat dissipation and cooling assembly 60; The cylindrical body 20-1 is provided, with a second space 21 in the middle, which is conducive to the installation of the motor 40, and isolates the motor 40 from the flue gas, which has a heat insulation effect and protects the motor 40. At the same time, it is conducive to the flow of cooling gas in the second space 21, which carries away the heat in the second space 21 and dissipates heat from and cools the motor 40. The first connecting end plate 20-2 is a circular plate structure that is connected to one end of the cylindrical body 20-1, for example, by screws. The first connecting end plate 20-2 is provided to facilitate the connection of the motor 40 by bolts, making assembly relatively convenient. The second connecting end plate 20-3 is a circular plate structure that is connected to one end of the cylindrical body 20-1, for example, by screws. This facilitates the connection of the heat dissipation and cooling component 60 and makes assembly relatively convenient. Another implementation method: like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown; in implementation, the connecting blades 30 are disposed between the outer shell 10 and the inner cylinder 20. For example, there are three connecting blades 30, which are welded to the outer shell 10 and the inner cylinder 20. Moreover, the connecting blades 30 are arc-shaped blades, which have a guiding function, so that the flue gas flow can flow along the first space 11 (e.g. Figure 4 (The direction of the large arrow) makes it smoother; Another implementation method: like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown; in implementation, the motor 40 is a common structure in the prior art, used to generate rotational driving force. The junction box 42 is set on the outer wall of the housing 10 and is electrically connected to the motor 40. For example, the motor 40 is a vertical double-shaft motor, model YE4-112M-4, with a motor power of 4KW, a speed of 1450r / min, a protection level of IP55, and an insulation level of H. The motor 40 is connected to the first connecting end plate 20-2 by bolts. One end of the transmission shaft 41 is connected to the main fan impeller 50, and the other end is connected to the ventilation impeller 60-1. When the motor 40 starts, it can rotate together with the main fan impeller 50 and the ventilation impeller 60-1. After seeing the disclosed content, a person skilled in the art can directly and without doubt know how to set up the motor 40 and the junction box 42 without having to put in creative effort or conduct excessive experiments. Another implementation method: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 As shown; in implementation, the main wind impeller 50 includes: an impeller body 50-1 connected to one end of the drive shaft 41; a pressure plate 50-2; and a connecting piece 50-3 connected to the drive shaft 41 and abutting against the pressure plate 50-2, wherein the pressure plate 50-2 presses down on the impeller body 50-1; The impeller body 50-1 includes: a first bushing 50-11 connected to one end of the drive shaft 41; a hub 50-12 connected to the first bushing 50-11 and surrounding the first bushing 50-11; a reinforcing rib 50-13 connected to the hub 50-12; and a plurality of first blades 50-14 evenly distributed on the outer wall of the hub 50-12. The first bushing 50-11 is fitted onto the drive shaft 41, and a key is provided between the first bushing 50-11 and the drive shaft 41 so that when the drive shaft 41 rotates, the first bushing 50-11 can rotate synchronously, and the synchronization is relatively good. The hub 50-12 and the first bushing 50-11 are connected by bolts, which makes assembly relatively convenient; The reinforcing rib 50-13 is a circular plate structure that is welded to the hub 50-12, thereby improving the structural strength. The first blade 50-14 is an arc-shaped blade, which is welded to the hub 50-12; An impeller body 50-1 is provided, which is rotated by a motor 40 to draw in the flue gas. The flue gas enters the first space 11 and flows along the first space 11, thus achieving the purpose of exhausting the smoke. Among them, the pressure plate 50-2 is a circular plate structure, with the connector 50-3 passing through the middle position; Among them, the connecting part 50-3 is a bolt, such as a hex bolt, which is threaded to the threaded hole on one end of the drive shaft 41. It is used to abut against the pressure plate 50-2, so that the pressure plate 50-2 presses down the impeller body 50-1, preventing the impeller body 50-1 from falling off the drive shaft 41. The structure has relatively good reliability. Another implementation method: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 As shown; in implementation, the heat dissipation and cooling assembly 60 includes: a ventilation impeller 60-1, disposed in the second space 21 and connected to the other end of the drive shaft 41; an air inlet pipe assembly 60-2, disposed in the first space 11, with one end connected to the inner cylinder 20 and the other end connected to the outer shell 10; and an air outlet pipe 60-3, disposed in the first space 11 and spaced apart from the air inlet pipe assembly 60-2, with one end connected to the inner cylinder 20 and communicating with the second space 21, and the other end connected to the outer shell 10; The ventilation impeller 60-1 includes: a second bushing 60-11 connected to the drive shaft 41; a rear cover 60-12 connected to the second bushing 60-11; a front cover 60-13 spaced apart from the rear cover 60-12 and close to the air inlet pipe assembly 60-2; and a plurality of second blades 60-14 evenly distributed between the rear cover 60-12 and the front cover 60-13. The second bushing 60-11 is fitted onto the drive shaft 41, and a key is provided between the second bushing 60-11 and the drive shaft 41, so that when the drive shaft 41 rotates, the second bushing 60-11 can rotate synchronously, and the synchronization is relatively good. The rear cover 60-12 is connected to the second bushing 60-11, for example, by welding. The second blade 60-14 is welded to the rear cover 60-12 and the front cover 60-13; A ventilation impeller 60-1 is installed, which is rotated by a motor 40 to draw cooling gas into the second space 21 (e.g., Figure 4 (In the direction of the small and medium arrows), the cooling gas flows in the second space 21 and is discharged through the exhaust pipe 60-3, carrying away the heat in the second space 21 and realizing the heat dissipation and cooling of the motor 40; The intake pipe assembly 60-2 includes: a connecting plate 60-21 connected to the inner cylinder 20, the connecting plate 60-21 having a through hole 60-21-1 communicating with the second space 21; a bent pipe section 60-22 connected to the connecting plate 60-21; a connecting pipe section 60-23 connected to the outer shell 10; and an intermediate pipe section 60-24, one end of which is connected to the bent pipe section 60-22, and the other end of which is inserted into the connecting pipe section 60-23. The connecting plate 60-21 is a circular plate structure, which is connected to the second connecting end plate 20-3 by bolts, making assembly relatively convenient. A through-hole 60-21-1 is provided to facilitate the entry of cooling gas into the second space 21; The pipe is equipped with a bend section 60-22, a connecting section 60-23, and an intermediate pipe section 60-24. The segmented arrangement of the pipe facilitates the layout of the pipeline, makes assembly relatively convenient, and also facilitates the entry of cooling gas into the second space 21. Among them, the exhaust pipe 60-3 is a section of circular pipe, which is welded to the cylindrical shell 10-1 and the cylindrical body 20-1 to facilitate the flow of cooling gas; The motor 40 is equipped with a heat dissipation and cooling component 60 to dissipate heat and cool the motor 40, which makes the motor 40 more stable in operation. It can run normally and continuously for 120 minutes at a temperature of 400℃ without obvious rubbing or short circuit. The motor 40 has relatively good high temperature resistance. In the description, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings. They are only for the convenience or simplification of the description and do not indicate a specific orientation that must be present. The operation process described in the embodiments is not an absolute usage step, and corresponding adjustments can be made in actual use. Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art; the words “first,” “second,” and similar terms used in the specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components, and similarly, the words “a” or “a” and similar terms do not determine a quantity limitation, but rather indicate the presence of at least one, as determined by the content of the embodiments; The above description is only a preferred embodiment, but the scope of protection is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art based on the technical solution and inventive concept within the scope of the technology disclosed should be included within the scope of protection.

Claims

1. An axial flow exhaust fan, characterized in that, include: An outer casing, wherein the outer casing has a first space; An inner cylinder is disposed in the first space and spaced apart from the outer shell; the inner cylinder has a second space inside. Several connecting blades are evenly distributed in the first space, connecting the outer shell and the inner cylinder; A motor is located in the second space and connected to one end of the inner cylinder, with one end of the drive shaft on the motor extending out of the inner cylinder and into the first space; The main impeller is disposed in the first space, connected to one end of the drive shaft, and spaced apart from the inner cylinder; A heat dissipation and cooling component is disposed between the outer shell, the inner cylinder and the motor, for introducing cooling gas from outside the outer shell into the second space. The cooling gas circulates in the second space and then flows from the second space to the outside of the outer shell to dissipate heat and cool the motor.

2. The axial flow exhaust fan according to claim 1, characterized in that: The outer shell includes: a cylindrical shell, wherein the cylindrical shell has the first space at its middle position; Two flanges are symmetrically arranged, one flange is connected to one end of the cylindrical housing, and the other flange is connected to the other end of the cylindrical housing; Two supporting feet are symmetrically arranged on the outer wall of the cylindrical shell; And lifting rings, which are disposed on the outer wall of the cylindrical shell and opposite to the supporting feet.

3. The axial flow exhaust fan according to claim 2, characterized in that: The inner cylinder includes: a cylindrical body, the second space being located in the middle of the cylindrical body, and the connecting leaf connecting the cylindrical body and the cylindrical shell; A first connecting end plate is disposed on one end of the cylindrical body, connecting the motor, and one end of the transmission shaft extends out of the first connecting end plate; And a second connecting end plate, which is disposed on the other end of the cylindrical body, and connected to the heat dissipation and cooling assembly.

4. The axial flow exhaust fan according to claim 1, characterized in that: The main impeller includes: an impeller body connected to one end of the drive shaft; Pressure plate; And a connecting piece, which is connected to the drive shaft and abuts against the pressure plate, the pressure plate pressing down on the impeller body.

5. The axial flow exhaust fan according to claim 4, characterized in that: The impeller body includes: a first bushing, which is connected to one end of the drive shaft; A hub is connected to the first bushing and surrounds the first bushing; Reinforcing ribs are attached to the wheel hub; And several first blades, evenly distributed on the outer wall of the hub.

6. The axial flow exhaust fan according to claim 4, characterized in that: The connecting component is a bolt.

7. The axial flow exhaust fan according to claim 1, characterized in that: The heat dissipation and cooling assembly includes: a ventilation impeller, disposed in the second space and connected to the other end of the drive shaft; An air intake pipe assembly is disposed in the first space, with one end connected to the inner cylinder and the other end connected to the outer shell; And an air outlet pipe is provided in the first space, spaced apart from the air inlet pipe assembly. One end of the air outlet pipe is connected to the inner cylinder and communicates with the second space, and the other end is connected to the outer shell.

8. The axial flow exhaust fan according to claim 7, characterized in that: The ventilation impeller includes: a second bushing, which is connected to the drive shaft; The rear cover is connected to the second bushing; The front cover is spaced apart from the rear cover and is close to the air intake pipe assembly; And several second blades, evenly distributed between the rear cover and the front cover.

9. The axial flow exhaust fan according to claim 7, characterized in that: The air intake pipe assembly includes: a connecting plate connected to the inner cylinder, the connecting plate having a through hole communicating with the second space; The bend in the pipe is connected to the connecting plate. The connecting pipe section is connected to the outer casing; And an intermediate pipe section, one end of which is connected to the bend pipe section, and the other end of which is inserted into the connecting pipe section.

10. The axial flow exhaust fan according to claim 7, characterized in that: The vent pipe is a section of circular pipe.

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