A fan for conveying a corrosive gas

Abstract

This invention relates to a fan for conveying corrosive gases, belonging to the field of fan technology. It includes a support frame, with a housing at one end along its length. The housing has an air inlet and an air outlet. A drive motor is mounted on the support frame, and an impeller rotates inside the housing. A transmission assembly is disposed between the drive motor and the housing, extending into the housing to connect the drive motor output shaft and the impeller. When the fan is operating, the transmission assembly extends into the housing, and the output shaft of the drive motor is not corroded, thus avoiding the impact of the corrosive gases inside the housing. If a problem occurs during fan operation, the transmission assembly can be replaced easily without waiting for the drive motor to cool down, offering high convenience.

Description

Technical Field

[0001] This invention relates to the field of fan technology, and in particular to a fan for conveying corrosive gases. Background Technology

[0002] A fan is a device that converts mechanical energy into gas kinetic energy. It uses the rotation of blades to generate airflow, thereby achieving functions such as ventilation, exhaust, cooling, and material conveying.

[0003] For fans that transport corrosive gases, in order to improve the service life of the fans, the fans need to be made of corrosion-resistant materials, have good sealing performance and stable operation capabilities, so as to ensure that corrosive gases do not leak out and protect the environment and the safety of workers.

[0004] Regarding the aforementioned technologies, in existing fans that transport corrosive gases, the motor is usually located close to the casing. Sealing components are typically installed on the casing to seal it and reduce leakage of corrosive gases. A sealing cover is then placed over the motor to further reduce corrosion. However, because the motor's output shaft extends beyond the sealing cover and into the casing to drive the impeller, it also becomes susceptible to corrosion. Over time, this can lead to the motor's output shaft failing to drive the impeller. If the output shaft malfunctions during operation, both the motor and the output shaft become very hot, making replacement difficult. The machine must be stopped and the motor and output shaft allowed to cool down before replacement, resulting in low convenience. Summary of the Invention

[0005] To address the aforementioned problems, this application provides a fan for conveying corrosive gases.

[0006] This application provides a fan for conveying corrosive gases, employing the following technical solution:

[0007] A fan for conveying corrosive gases includes a support frame, a housing at one end of the support frame along its length, an air inlet and an air outlet, a drive motor mounted on the support frame, an impeller rotating inside the housing, and a transmission assembly between the drive motor and the housing, the transmission assembly extending into the housing for connecting the output shaft of the drive motor and the impeller.

[0008] By adopting the above technical solution, when the fan is working, the transmission component extends into the inside of the casing. The output shaft of the drive motor is not corroded and will not be affected by the corrosive gas inside the casing. If a problem occurs during the operation of the fan, the transmission component can be replaced. Replacement is convenient and does not require waiting for the drive motor to cool down, making it highly convenient.

[0009] Optionally, the transmission assembly includes a transmission base, a transmission shaft rotatably mounted inside the transmission base, bearings at both ends of the transmission base along its length, the outer rings of the two bearings being fixedly connected to the transmission base, the transmission shaft being fixedly connected to the inner rings of the bearings, one end of the transmission shaft along its length being detachably connected to the output shaft of the drive motor, and the transmission assembly also includes an extension shaft, which is detachably connected to the other end of the transmission shaft along its length, and extends into the housing and is detachably connected to the impeller.

[0010] By adopting the above technical solution, the output shaft of the drive motor can be rotated to drive the transmission shaft to rotate, which in turn drives the extension shaft to rotate, and then drives the impeller to rotate. The structure is simple and the drive is convenient. The bearings can reduce the wear generated when the transmission shaft rotates, thereby improving the service life of the transmission shaft. During the operation of the fan, if the extension shaft cannot be used normally due to the influence of corrosive gases during long-term use, the staff can simply replace the extension shaft. The structure is simple, the replacement is convenient, and the convenience is high.

[0011] Optionally, the impeller includes a disk with a number of main blades evenly spaced on the side of the disk away from the drive seat. An extension shaft passes through the disk and is keyed to the disk. The extension shaft is detachably connected (bolted) to a shaft cover, which is located on the side of the disk away from the drive motor.

[0012] By adopting the above technical solution, the connection between the extension shaft and the wheel is relatively simple and the replacement is relatively convenient. When replacing, the shaft cover is disconnected from the extension shaft, and then the wheel and the extension shaft are moved away from each other. Disassembly and replacement are relatively convenient.

[0013] Optionally, the air outlet is located at the upper end of the housing. When the extension shaft is connected to the wheel, several main blades are evenly spaced around the circumference of the extension shaft, and the ends of the main blades away from the shaft cover are all arc-shaped.

[0014] By adopting the above technical solution, the fan can drive the direction of the corrosive gas by using the main blades during operation, thus driving the corrosive gas towards the outlet and achieving high efficiency in transporting the corrosive gas.

[0015] Optionally, the wheel disk has several sets of blades evenly spaced on the side near the transmission seat. When the extension shaft is connected to the wheel disk, the several sets of blades are evenly spaced around the circumference of the extension shaft.

[0016] By adopting the above technical solution, when the fan is running, the auxiliary blades rotate along with the main blades. As the auxiliary blades rotate, the gas located outside the casing can be drawn into the inside of the casing, thereby reducing the occurrence of corrosive gas leakage inside the casing.

[0017] Optionally, a negative pressure ring is provided inside the housing, located between the housing and the wheel, and the negative pressure ring is located on the side of the wheel away from the main blade.

[0018] By adopting the above technical solution, when the auxiliary blades rotate, the negative pressure ring can increase the negative pressure generated when the auxiliary blades rotate, thereby increasing the intensity of external gas intake and further reducing the occurrence of corrosive gas leakage to the outside of the casing.

[0019] Optionally, the diameter of the wheel is larger than the diameter of the negative pressure ring, and a collar extends from the side of the wheel near the negative pressure ring. The collar covers the outside of the negative pressure ring, and an air vent is formed between the collar and the negative pressure ring.

[0020] By adopting the above technical solution, the negative pressure generated when the auxiliary blades rotate is further increased by setting the collar; moreover, the collar also rotates when the wheel rotates. When the wheel rotates at high speed, the collar can generate centrifugal force, which further draws external air into the inside of the casing, reducing the occurrence of corrosive gas leakage to the outside of the casing.

[0021] Optionally, a wind-cutting plate is fixedly connected to one side of the secondary blade along its length, and the wind-cutting plate is inclinedly arranged on the side of the secondary blade away from the wheel.

[0022] By adopting the above technical solution, as the auxiliary blades rotate, they drive several air cutters to move, thereby disturbing the gas around the air cutters, increasing the negative pressure inside the casing, and causing the gas outside the casing to tend to flow into the casing, thereby reducing the occurrence of corrosive gas leakage inside the casing.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. When the fan is working, the transmission component extends into the casing. The output shaft of the drive motor is not corroded. The output shaft of the drive motor is not affected by the corrosive gas inside the casing. If a problem occurs during the operation of the fan, the transmission component can be replaced. Replacement is convenient and does not require waiting for the drive motor to cool down.

[0025] 2. By manipulating the output shaft of the drive motor to rotate, the transmission shaft can be driven to rotate, which in turn drives the extension shaft to rotate, and in turn drives the impeller to rotate. The structure is simple and the drive is convenient. The bearings installed can reduce the wear generated during the rotation of the transmission shaft, thereby improving the service life of the transmission shaft. During the operation of the fan, if the extension shaft is affected by corrosive gases and cannot be used normally after long-term use, the staff can simply replace the extension shaft. The structure is simple, the replacement is convenient, and the convenience is high.

[0026] 3. The connection between the extension shaft and the wheel is relatively simple and easy to replace. When replacing, simply disconnect the shaft cover from the extension shaft, and then move the wheel and the extension shaft away from each other. Disassembly and replacement are relatively convenient. Attached Figure Description

[0027] Figure 1 This is a cross-sectional schematic diagram of Example 1.

[0028] Figure 2 This is a schematic diagram showing the casing in Embodiment 1.

[0029] Figure 3 This is a schematic diagram highlighting the main blade in Embodiment 1.

[0030] Figure 4 This is a schematic diagram highlighting the impeller in Embodiment 1.

[0031] Figure 5 This is a cross-sectional schematic diagram of Example 2.

[0032] Figure 6 yes Figure 5 An enlarged schematic diagram of part A in the middle.

[0033] Figure 7 This is a cross-sectional schematic diagram of Example 3.

[0034] Figure 8 yes Figure 7 Enlarged schematic diagram of part B.

[0035] Figure 9 This is a cross-sectional schematic diagram of Example 4.

[0036] Figure 10 This is a schematic diagram highlighting the secondary blades in Example 4.

[0037] Figure 11 This is a schematic diagram highlighting the air-cutting plate in Embodiment 4.

[0038] Explanation of reference numerals in the attached drawings: 1. Bracket; 11. Drive motor; 2. Housing; 21. Air inlet; 22. Air outlet; 23. Impeller; 24. Disc; 241. Main blade; 242. Windward section; 243. Secondary blade; 3. Transmission base; 31. Transmission shaft; 32. Bearing; 4. Insertion shaft; 5. Negative pressure ring; 6. Collar; 7. Air cutter; 8. Shaft cover. Detailed Implementation

[0039] The present application will be further described in detail below with reference to all the accompanying drawings.

[0040] This application discloses a fan for conveying corrosive gases.

[0041] Example 1:

[0042] Reference Figure 1 and Figure 2 A fan for conveying corrosive gases includes a support frame 1, with a housing 2 at one end along its length. The housing 2 has an air inlet 21 and an air outlet 22. A drive motor 11 is mounted on the support frame 1, and an impeller 23 rotates inside the housing 2. A transmission assembly is provided between the drive motor 11 and the housing 2, extending into the housing 2 to connect the output shaft of the drive motor 11 and the impeller 23. When the fan is operating, the transmission assembly extends into the housing 2, and the output shaft of the drive motor 11 is not corroded. Therefore, the output shaft of the drive motor 11 is not affected by the corrosive gases inside the housing 2. If a problem occurs during fan operation, the transmission assembly can be replaced easily without waiting for the drive motor 11 to cool down, making it highly convenient.

[0043] Reference Figure 1 and Figure 2 The transmission assembly includes a transmission base 3, within which a transmission shaft 31 rotates. Bearings 32 are installed at both ends of the transmission base 3 along its length. The outer rings of both bearings 32 are fixedly connected to the transmission base 3. The transmission shaft 31 is fixedly connected to the inner rings of the bearings 32. One end of the transmission shaft 31 along its length is connected to the output shaft of the drive motor 11 via a flange. A sealing sleeve is fitted over the transmission shaft 31, located at the end of the transmission shaft 31 closest to the housing 2, to seal the transmission shaft 31, thereby reducing contact between corrosive gases and the transmission shaft 31 and improving its service life. A shaft seal is installed on the housing 2, with the shaft seal sleeve located outside the sealing ring, to seal the transmission shaft 31, thereby reducing contact between corrosive gases and the transmission shaft 31, improving its service life, and also reducing leakage of corrosive gases from the housing 2 to the outside.

[0044] Reference Figure 1 and Figure 3 The transmission assembly also includes an extension shaft 4, which is keyed to the other end of the transmission shaft 31 along its length. The impeller 23 includes a disc 24, on which a number of main blades 241 are equally spaced. The extension shaft 4 passes through the disc 24 and is keyed to it. The extension shaft 4 is threadedly connected to a shaft cover 8, which is located on the side of the disc 24 away from the drive motor 11. The shaft cover 8 can protect the extension shaft 4, thereby reducing the impact on the extension shaft 4 when conveying corrosive gases.

[0045] Reference Figures 1 to 3The air outlet 22 is located at the upper end of the housing 2. When the extension shaft 4 is connected to the wheel 24, several main blades 241 are evenly spaced around the extension shaft 4. The ends of the main blades 241 away from the shaft cover 8 are all arc-shaped, and the arc-shaped main blades 241 are designated as the windward section 242. By operating the output shaft of the drive motor 11 to rotate, the transmission shaft 31 is driven to rotate. The bearing 32 can reduce the wear generated when the transmission shaft 31 rotates, thereby improving the service life of the transmission shaft 31. The extension shaft 4 is driven to rotate, which in turn drives the wheel 24 to rotate, which in turn drives the main blades 241 to move. At this time, corrosive gas can be sent into the housing 2 from the air inlet 21. As the main blades 241 rotate, the windward section 242 changes the wind direction of the corrosive gas, driving the corrosive gas towards the air outlet 22.

[0046] Reference Figure 1 and Figure 4 The wheel 24 has several secondary blades 243 evenly spaced on the side near the transmission seat 3. When the shaft 4 is connected to the wheel 24, the secondary blades 243 are evenly spaced around the shaft 4. When the wheel 24 rotates, the secondary blades 243 rotate with the main blades 241. As the secondary blades 243 rotate, the gas outside the casing 2 tends to enter the interior of the casing 2. Before using the fan to transport corrosive gas, the operator can adjust the amount of air entering the casing 2 according to the number of secondary blades 243 to ensure that the corrosive gas inside the fan does not leak out.

[0047] Reference Figure 1 and Figure 4 If the extension shaft 4 becomes unusable due to corrosive gases during long-term use, the operator can replace it. First, the drive motor 11 is turned off, and then the extension shaft 4 can be removed. The new extension shaft 4 can then be connected to the transmission shaft 31 and the wheel 24. The structure is simple, the replacement is convenient, and the convenience is high.

[0048] Among them, the main blade 241, the secondary blade 243, the wheel 24, the drive shaft 31 and the extension shaft 4 are all made of corrosion-resistant materials. In this embodiment, stainless steel is preferred, but other materials can also be used as long as they have good corrosion resistance.

[0049] The working principle of a fan for conveying corrosive gas according to an embodiment of this application is as follows: The output shaft of the drive motor 11 is rotated, which in turn drives the transmission shaft 31 to rotate. The bearing 32 reduces wear on the transmission shaft 31 during rotation, thereby increasing its service life. The extension shaft 4 is then rotated, causing the wheel 24 to rotate and the main blades 241 to move. Corrosive gas is then introduced into the casing 2 from the air inlet 21. As the main blades 241 rotate, the windward section 242 changes the direction of the corrosive gas, directing it towards the air outlet 22. Driven by the main blade 241, the auxiliary blade 243 rotates with the main blade 241. As the auxiliary blade 243 rotates, the gas outside the casing 2 tends to enter the interior of the casing 2, thereby reducing the leakage of corrosive gas inside the fan. If the extension shaft 4 becomes unusable due to the influence of corrosive gas during long-term use, the operator can replace the extension shaft 4. First, the drive motor 11 is turned off, and then the extension shaft 4 can be removed. Then, the new extension shaft 4 can be connected to the transmission shaft 31 and the wheel 24. The structure is simple, the replacement is convenient, and the convenience is high.

[0050] Example 2:

[0051] Reference Figure 5 and Figure 6 The difference between Embodiment 2 and Embodiment 1 lies in the different configuration inside the casing 2.

[0052] Reference Figure 5 and Figure 6 A negative pressure ring 5 is provided inside the housing 2. The negative pressure ring 5 is located between the housing 2 and the wheel 24. The negative pressure ring 5 is located on the side of the wheel 24 away from the main blade 241. As the wheel 24 rotates, the negative pressure ring 5 can increase the negative pressure generated when the auxiliary blade 243 rotates, thereby increasing the intensity of external gas intake and further reducing the occurrence of corrosive gas leakage to the outside of the housing 2.

[0053] Example 3:

[0054] Reference Figure 7 and Figure 8 The difference between Embodiment 3 and the above embodiments lies in the different configuration of the roulette wheel 24.

[0055] Reference Figure 7 and Figure 8The diameter of the wheel 24 is larger than that of the negative pressure ring 5. A collar 6 extends from the side of the wheel 24 near the negative pressure ring 5. The collar 6 covers the outside of the negative pressure ring 5, and an air vent is formed between the collar 6 and the negative pressure ring 5. As the wheel 24 rotates, the collar 6 can further increase the negative pressure generated when the auxiliary blade 243 rotates. Moreover, the collar 6 will also rotate when the wheel 24 rotates. When the wheel 24 rotates at high speed, the collar 6 can generate centrifugal force, which can further draw external air into the interior of the housing 2, reducing the occurrence of corrosive gas leakage to the outside of the housing 2.

[0056] Example 4:

[0057] Reference Figure 9 and Figure 10 The difference between Embodiment 4 and the above embodiments lies in the different arrangement of the secondary blade 243.

[0058] Reference Figures 9 to 11 A cutter plate 7 is fixedly connected to one side of the secondary blade 243 along its length. The cutter plate 7 is inclinedly arranged on the side of the secondary blade 243 away from the wheel 24. As the wheel 24 rotates, the secondary blade 243 rotates, which in turn drives several cutter plates 7 to move, thereby disturbing the gas around the cutter plates 7, increasing the negative pressure inside the casing 2, and causing the gas outside the casing 2 to tend to flow into the casing 2, thereby reducing the occurrence of corrosive gas leakage inside the casing 2.

[0059] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fan for conveying corrosive gases, comprising a support frame (1), characterized in that: The bracket (1) has a housing (2) at one end along its length. The housing (2) has an air inlet (21) and an air outlet (22). The bracket (1) is equipped with a drive motor (11). An impeller (23) rotates inside the housing (2). A transmission assembly is provided between the drive motor (11) and the housing (2). The transmission assembly extends into the interior of the housing (2) and is used to connect the output shaft of the drive motor (11) and the impeller (23). The transmission assembly includes a transmission seat (3), a transmission shaft (31) rotatably mounted inside the transmission seat (3), bearings (32) are provided at both ends of the transmission seat (3) along its length, the outer rings of the two bearings (32) are fixedly connected to the transmission seat (3), the transmission shaft (31) is fixedly connected to the inner ring of the bearing (32), one end of the transmission shaft (31) along its length is detachably connected to the output shaft of the drive motor (11), the transmission assembly also includes an extension shaft (4), the extension shaft (4) is detachably connected to the other end of the transmission shaft (31) along its length, the extension shaft (4) extends into the housing (2) and is detachably connected to the impeller (23); The impeller (23) includes a wheel disk (24), and a number of main blades (241) are equally spaced on the side of the wheel disk (24) away from the transmission seat (3). An extension shaft (4) passes through the wheel disk (24) and is keyed to the wheel disk (24). The extension shaft (4) is detachably connected to a shaft cover (8), which is located on the side of the wheel disk (24) away from the drive motor (11). The wheel (24) has several blades (243) evenly spaced on the side near the transmission seat (3). When the shaft (4) is connected to the wheel (24), the blades (243) are evenly spaced around the shaft (4). A negative pressure ring (5) is provided inside the housing (2). The negative pressure ring (5) is located between the housing (2) and the wheel (24). The negative pressure ring (5) is located on the side of the wheel (24) away from the main blade (241). The diameter of the wheel (24) is larger than the diameter of the negative pressure ring (5). A collar (6) extends from the side of the wheel (24) near the negative pressure ring (5). The collar (6) covers the outside of the negative pressure ring (5), and an air vent is formed between the collar (6) and the negative pressure ring (5). A wind-cutting plate (7) is fixedly connected to one side of the secondary blade (243) along its length. The wind-cutting plate (7) is obliquely arranged on the side of the secondary blade (243) away from the wheel disk (24).

2. The fan for conveying corrosive gases according to claim 1, characterized in that: The air outlet (22) is located at the upper end of the housing (2). When the extension shaft (4) is connected to the wheel (24), several main blades (241) are arranged at equal intervals around the extension shaft (4). The ends of the several main blades (241) away from the shaft cover (8) are all arc-shaped.

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