A multi-stage supercharged axial flow fan

Abstract

The utility model discloses a multistage pressure boost type axial flow fan, include: casing, hollow formation flow cavity, motor is located in the flow cavity, and is connected with the casing, and the motor has two output shafts, and two output shafts respectively stretch out to the front and back two ends, first impeller is located at the front side of motor, and is connected with the output shaft of motor forward stretch, second impeller is located at the back side of motor, and is connected with the output shaft of motor backward stretch, first air guide body is located at the front end of flow cavity and is connected with the casing, and first air guide body includes a plurality of first guide vane, and a plurality of first guide vane is arranged around the center axis of flow cavity circumference, second air guide body is located at the rear end of flow cavity and is connected with the casing, and second air guide body includes a plurality of second guide vane, and a plurality of second guide vane is arranged around the center axis of flow cavity circumference. The utility model can satisfy the working demand of low flow, high pressure.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a multi-stage booster axial flow fan. Background Technology

[0002] The main function of axial flow fans is to generate airflow and drive air movement. They are widely used in many fields such as chemical, metallurgical, light industry, food, and machinery equipment. However, existing axial flow fans are usually used in applications with high flow rate requirements and low pressure requirements, and are difficult to meet the needs of low flow rate and high pressure in working environments. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a multi-stage booster axial flow fan.

[0004] The solution to the technical problem of this utility model is:

[0005] A multi-stage booster axial flow fan, comprising:

[0006] The shell is hollow, forming a flow cavity;

[0007] A motor is located inside the flow cavity and connected to the housing. The motor has two output shafts, which extend forward and backward respectively.

[0008] The first impeller is located on the front side of the motor and is connected to the output shaft that extends forward from the motor;

[0009] The second impeller is located on the rear side of the motor and is connected to the output shaft of the motor extending rearward.

[0010] A first air guide body is disposed at the front end of the flow cavity and connected to the housing. The first air guide body includes multiple first guide vanes, which are arranged circumferentially around the central axis of the flow cavity.

[0011] The second air guide body is located at the rear end of the flow cavity and connected to the housing. The second air guide body includes multiple second guide vanes, which are arranged circumferentially around the central axis of the flow cavity.

[0012] This invention has at least the following beneficial effects: The first guide body can pre-swirl the airflow to the first impeller, reducing the angle of attack between the airflow and the first impeller, improving the stall phenomenon caused by insufficient flow, thereby reducing the resistance coefficient between the fluid and the first impeller, achieving a pressurization effect. The second guide body can rectify the airflow accelerated by the second impeller, reducing the angle of attack, and guiding the airflow to the outlet of the multi-stage booster axial flow fan, improving the internal losses caused by the swirling flow generated by the axial rotation of the multi-stage booster axial flow fan, achieving the effects of pressurization and efficiency improvement. In use, when the motor is started, the airflow passes sequentially through the first guide body, the first impeller, the second impeller, and the second guide body, which can meet the low flow and high pressure requirements of the working site.

[0013] As a further improvement to the above technical solution, the housing includes a mounting shell, a first outer shell, and a second outer shell. The first outer shell is detachably connected to the front end of the mounting shell, and the second outer shell is detachably connected to the rear end of the mounting shell. The motor is connected to the mounting shell, the first guide vane is connected to the first outer shell, and the second guide vane is connected to the second outer shell.

[0014] As a further improvement to the above technical solution, the multi-stage booster axial flow fan also includes a collector, which is connected to the front end of the housing. The collector is hollow to form a collection cavity, which is connected to the flow cavity.

[0015] As a further improvement to the above technical solution, the collector is detachably connected to the front end of the housing.

[0016] As a further improvement to the above technical solution, the multi-stage booster axial flow fan also includes a rectifier shroud, which is connected to the middle of the first air guide body. The rectifier shroud is provided with a rectifying surface, which is arc-shaped and protrudes forward.

[0017] As a further improvement to the above technical solution, the first air guide body also includes a first connecting seat, the first guide vane is arranged around the outer periphery of the first connecting seat, and the fairing is detachably connected to the front end of the first connecting seat.

[0018] As a further improvement to the above technical solution, both the first guide vane and the second guide vane are arc-shaped guide vanes.

[0019] As a further improvement to the above technical solution, the first impeller includes a first hub, multiple first connecting shafts, and multiple first blades. The first hub is connected to the corresponding output shaft. The multiple first connecting shafts are arranged around the outer periphery of the first hub and extend radially along the flow cavity. The first connecting shafts are detachably connected to the first hub, and the first blades are connected to the first connecting shafts one-to-one. The second impeller includes a second hub, multiple second connecting shafts, and multiple second blades. The second hub is connected to the corresponding output shaft. The multiple second connecting shafts are arranged around the outer periphery of the second hub and extend radially along the flow cavity. The second connecting shafts are detachably connected to the second hub, and the second blades are connected to the second connecting shafts one-to-one.

[0020] As a further improvement to the above technical solution, the first hub includes multiple sets of first connecting assemblies, which are arranged circumferentially around the central axis of the flow cavity; the second hub includes multiple sets of second connecting assemblies, which are arranged circumferentially around the central axis of the flow cavity; each set of first connecting assemblies and each set of second connecting assemblies includes two clamping plates, which are connected by bolts, and a clamping groove is formed between the two clamping plates, which is used to clamp the first connecting shaft or the second connecting shaft.

[0021] As a further improvement to the above technical solution, the multi-stage booster axial flow fan also includes a mounting base, which is connected to the lower end of the housing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the multi-stage booster axial flow fan according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the first air guide body according to an embodiment of the present utility model;

[0025] Figure 3 This is a front view of the first air guide body according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the second air guide body according to an embodiment of the present invention;

[0027] Figure 5This is a rear view of the second air guide body according to an embodiment of the present utility model.

[0028] Reference numerals: 100, housing; 110, mounting housing; 120, first outer shell; 130, second outer shell; 200, motor; 300, first impeller; 400, second impeller; 500, first guide body; 510, first guide vane; 520, first connecting seat; 600, second guide body; 610, second guide vane; 620, second connecting seat; 700, collector; 800, shunting cover; 900, mounting seat. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. The various technical features of this utility model can be combined interactively without contradicting each other.

[0034] Reference Figures 1 to 5This utility model embodiment proposes a multi-stage booster axial flow fan that can meet the needs of low flow and high pressure on site.

[0035] In this embodiment, the multi-stage booster axial flow fan includes a housing 100, a motor 200, a first impeller 300, and a second impeller 400. The housing 100 is hollow, forming a flow cavity. The motor 200 is disposed inside the flow cavity and connected to the housing 100. The motor 200 is a dual-shaft motor 200, having two output shafts, one extending forward and the other extending backward. The first impeller 300 is disposed on the front side of the motor 200 and connected to the forward-extending output shaft of the motor 200. The second impeller 400 is disposed on the rear side of the motor 200 and connected to the rearward-extending output shaft of the motor 200.

[0036] It is worth noting that the multi-stage booster axial flow fan in this embodiment also includes a first guide body 500 and a second guide body 600. The first guide body 500 is disposed at the front end of the flow cavity and connected to the housing 100, and includes multiple first guide vanes 510 arranged circumferentially around the central axis of the flow cavity. The second guide body 600 is disposed at the rear end of the flow cavity and connected to the housing 100, and includes multiple second guide vanes 610 arranged circumferentially around the central axis of the flow cavity.

[0037] In operation, the multi-stage booster axial flow fan is started, and the airflow sequentially passes through the first guide body 500, the first impeller 300, the second impeller 400, and the second guide body 600. Due to the short distance between the first guide body 500 and the first impeller 300, the first guide body 500 can pre-swirl the airflow to the first impeller 300, reducing the angle of attack between the airflow and the first impeller 300, improving the stall phenomenon caused by insufficient flow, thereby reducing the resistance coefficient between the fluid and the first impeller 300, achieving a boosting effect. Because the short distance between the second guide body 600 and the second impeller 400, the second guide body 600 can rectify the airflow accelerated by the second impeller 400, reducing the angle of attack and guiding the airflow to the outlet of the multi-stage booster axial flow fan. This improves the internal losses caused by the swirling flow generated by the axial rotation of the multi-stage booster axial flow fan. In addition, this structure can also simultaneously improve the swirling problem of the airflow at the duct outlet (supply air), thus achieving both boosting and efficiency improvement.

[0038] In this embodiment, the first impeller 300 and the second impeller 400 are arranged at both ends of the motor 200 and driven by the same motor 200. The motor 200 is subjected to reasonable force and can overcome the selection difficulties when using a bipolar motor 200, thus meeting the on-site requirements of low flow and high pressure.

[0039] In some embodiments, the housing 100 includes a mounting housing 110, a first outer housing 120, and a second outer housing 130. The first outer housing 120 is detachably connected to the front end of the mounting housing 110, the first guide vane 510 is connected to the first outer housing 120, the second outer housing 130 is detachably connected to the rear end of the mounting housing 110, and the second guide vane 610 is connected to the second outer housing 130.

[0040] This configuration allows the housing 100 to be disassembled, which facilitates the maintenance and repair of the motor 200, the first impeller 300, and the second impeller 400 located in the middle of the flow cavity.

[0041] In addition, after the first outer shell 120 and the second outer shell 130 are disassembled, the first air guide 500 and the second air guide 600 are also disassembled. Disassembling the first air guide 500 and the second air guide 600 can achieve the effect of pressure reduction, thereby adapting to different working requirements and adjusting the operating power of the multi-stage booster axial flow fan.

[0042] In some embodiments, flange structures are provided at the front and rear ends of the mounting shell 110, and flange structures are also provided at the rear end of the first shell 120 and the front end of the second shell 130. The first shell 120 and the mounting shell 110, as well as the second shell 130 and the mounting shell 110, are detachably connected by flange structures and bolts, respectively.

[0043] Of course, the connection between the mounting shell 110 and the first outer shell 120, as well as between the mounting shell 110 and the second outer shell 130, can also be achieved through fasteners or other connectors.

[0044] In some embodiments, the multi-stage booster axial flow fan further includes a collector 700, which is connected to the front end of the housing 100. The collector 700 is hollow, forming a collecting cavity, which is connected to the flow cavity. Before entering the flow cavity, the fluid passes through the collecting cavity for collection, where the airflow is accelerated and a uniform velocity and pressure field is established to reduce flow losses and improve the efficiency of the multi-stage booster axial flow fan.

[0045] In some embodiments, the collector 700 is detachably connected to the front end of the housing 100. Operators can install or remove the collector 700 as needed to suit different operational requirements.

[0046] In some embodiments, the front end of the first housing 120 is provided with a flange structure, and the rear end of the collector 700 is also provided with a corresponding flange structure. The collector 700 and the first housing 120 are detachably connected by the flange structure and bolts. It is understood that the collector 700 and the first housing 120 can also be connected by other connectors such as snap-fit ​​fasteners.

[0047] In this embodiment, the collector 700 includes a collecting part and a connecting part. The front end of the connecting part is connected to the rear end of the collecting part, and the rear end of the connecting part is detachably connected to the first housing 120. The diameter of the collecting part gradually decreases from front to back. The airflow enters from the front end of the collecting part, and the inner diameter of the collecting cavity gradually decreases to achieve the airflow acceleration effect.

[0048] In some embodiments, the multi-stage booster axial flow fan further includes a shroud 800, which is connected to the middle of the first air guide body 500. The shroud 800 is provided with a rectifying surface, which is arc-shaped and protrudes forward.

[0049] Understandably, the rectifier 800 can guide and rectify the airflow entering the flow chamber, making the airflow enter the flow chamber more smoothly and orderly, thereby reducing the pressure loss generated during the airflow process and improving the pressure and flow of the multi-stage booster axial flow fan.

[0050] In this embodiment, the first air guide body 500 further includes a first connecting seat 520, and first guide vanes 510 are arranged around the outer periphery of the first connecting seat 520. The shunting cover 800 is detachably connected to the front end of the first connecting seat 520. The shunting cover 800 can rectify the fluid and guide the fluid to flow into the gap between two adjacent first guide vanes 510.

[0051] Since the fairing 800 can be removed from the first connecting seat 520, it is beneficial for the processing and production of the fairing 800 and the first connecting seat 520, and also for the subsequent separate maintenance of the fairing 800 and the first air guide 500. Moreover, operators can install or remove the fairing 800 according to the actual situation on site to adapt to different working scenarios.

[0052] In some embodiments, the fairing 800 is connected to the first connecting seat 520 by bolts.

[0053] In some embodiments, the second air guide body 600 further includes a second connecting seat 620, and the second guide vane 610 is arranged around the outer periphery of the second connecting seat 620.

[0054] In this embodiment, the first air guide 500 and the second air guide 600 have the same structure but are installed in opposite directions. The first impeller 300 and the second impeller 400 have the same structure but are installed in opposite directions. This design is more conducive to the production and processing of various parts in a multi-stage booster axial flow fan, reduces the design of part production molds, and lowers production costs.

[0055] In some embodiments, the first guide vane 510 and the second guide vane 610 are both arc-shaped guide vanes, which can effectively guide the airflow and improve the efficiency of the multi-stage booster axial flow fan.

[0056] In some embodiments, the first impeller 300 includes a first hub, a plurality of first connecting shafts, and a plurality of first blades. The first hub is connected to a corresponding output shaft, the plurality of first connecting shafts are evenly arranged around the outer periphery of the first hub and extend radially along the flow cavity respectively, the first connecting shafts are detachably connected to the first hub, and the first blades are connected to the first connecting shafts one by one.

[0057] This configuration allows for adjustment of the number and spacing of the first blades in the first impeller 300 to accommodate more diverse operational needs.

[0058] In some embodiments, the second impeller 400 includes a second hub, a plurality of second connecting shafts, and a plurality of second blades. The second hub is connected to a corresponding output shaft, the plurality of second connecting shafts are evenly arranged around the outer periphery of the second hub and extend radially along the flow cavity respectively, the second connecting shafts are detachably connected to the second hub, and the second blades are connected to the second connecting shafts one by one.

[0059] This configuration allows for adjustment of the number and spacing of the second blades in the second impeller 400 to accommodate more diverse operational needs, making the multi-stage booster axial flow fan more versatile.

[0060] In some embodiments, the first hub includes multiple sets of first connecting assemblies, which are evenly arranged circumferentially around the central axis of the flow cavity. The second hub includes multiple sets of second connecting assemblies, which are also evenly arranged circumferentially around the central axis of the flow cavity. Each set of first connecting assemblies and each set of second connecting assemblies has the same structure, each including two clamping plates connected by bolts. A clamping groove is formed between the two clamping plates to clamp either the first connecting shaft or the second connecting shaft, thereby achieving connection between the first connecting shaft and the first hub or between the second connecting shaft and the second hub.

[0061] Understandably, by loosening the bolts connecting the two clamping plates, the clamping slot can release the first or second connecting shaft, allowing it to rotate freely within the clamping slot. The operator can then adjust the angle of the first or second blade, thereby adjusting the airflow and air pressure of the multi-stage booster axial flow fan to adapt to different working conditions and needs.

[0062] After adjustment, the two clamping plates are locked with bolts. The two clamping plates can stably hold the first connecting shaft or the second connecting shaft, thereby preventing the first blade or the second blade from changing angle during the use of the multi-stage booster axial flow fan, so as to ensure the working stability of the multi-stage booster axial flow fan.

[0063] In some embodiments, the multi-stage booster axial flow fan also includes a mounting base 900, which is connected to the lower end of the housing 100, enabling the multi-stage booster axial flow fan to be stably placed on a plane.

[0064] In this embodiment, two mounting bases 900 are provided, which are located at the front and rear ends of the mounting shell 110, respectively. This can improve the stability of the multi-stage booster axial flow fan. Moreover, after disassembling the first shell 120, the second shell 130, the collector 700 and other structures, the fan can still be placed stably.

[0065] By using the multi-stage booster axial flow fan of this embodiment, a boosting effect can be effectively achieved to meet the on-site requirements of low flow rate and high pressure. Its working principle is as follows: After starting the motor 200 of the multi-stage booster axial flow fan, the airflow is accelerated by the collector 700 and enters the flow chamber. Under the guidance of the rectifier 800, it flows evenly through the first guide body 500. Under the guidance of the first guide body 500, the angle of attack between the airflow and the first blades is reduced, improving the stall phenomenon caused by insufficient flow rate, thereby reducing the resistance coefficient between the fluid and the first impeller 300 and improving the boosting effect. The airflow sequentially passes through the first impeller 300 and the second impeller 400, achieving a boosting effect through the action of the two impellers, and then flows out to the second guide body 600. The second guide body 600 rectifies the airflow that has been accelerated by the two impellers, reducing the angle of attack and improving the swirling flow generated by the axial rotation of the multi-stage booster axial flow fan, reducing internal losses, and further achieving the effects of boosting pressure and improving efficiency.

[0066] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A multi-stage booster axial flow fan, characterized in that, include: The shell is hollow, forming a flow cavity; A motor is located inside the flow cavity and connected to the housing. The motor has two output shafts, which extend forward and backward respectively. The first impeller is located on the front side of the motor and is connected to the output shaft that extends forward from the motor; The second impeller is located on the rear side of the motor and is connected to the output shaft of the motor extending rearward. A first air guide body is disposed at the front end of the flow cavity and connected to the housing. The first air guide body includes multiple first guide vanes, which are arranged circumferentially around the central axis of the flow cavity. The second air guide body is located at the rear end of the flow cavity and connected to the housing. The second air guide body includes multiple second guide vanes, which are arranged circumferentially around the central axis of the flow cavity.

2. The multi-stage booster axial flow fan according to claim 1, characterized in that, The housing includes a mounting shell, a first outer shell, and a second outer shell. The first outer shell is detachably connected to the front end of the mounting shell, and the second outer shell is detachably connected to the rear end of the mounting shell. The motor is connected to the mounting shell, the first guide vane is connected to the first outer shell, and the second guide vane is connected to the second outer shell.

3. The multi-stage booster axial flow fan according to claim 1, characterized in that, The multi-stage booster axial flow fan also includes a collector, which is connected to the front end of the housing. The collector is hollow to form a collection cavity, which is connected to the flow cavity.

4. The multi-stage booster axial flow fan according to claim 3, characterized in that, The collector is detachably connected to the front end of the housing.

5. The multi-stage booster axial flow fan according to claim 1, characterized in that, The multi-stage booster axial flow fan also includes a rectifier shroud, which is connected to the middle of the first air guide body. The rectifier shroud has a rectifying surface, which is arc-shaped and protrudes forward.

6. The multi-stage booster axial flow fan according to claim 5, characterized in that, The first air guide body also includes a first connecting seat, the first guide vane is arranged around the outer periphery of the first connecting seat, and the fairing is detachably connected to the front end of the first connecting seat.

7. The multi-stage booster axial flow fan according to claim 1, characterized in that, Both the first guide vane and the second guide vane are arc-shaped guide vanes.

8. The multi-stage booster axial flow fan according to claim 1, characterized in that, The first impeller includes a first hub, multiple first connecting shafts, and multiple first blades. The first hub is connected to the corresponding output shaft. The multiple first connecting shafts are arranged around the outer periphery of the first hub and extend radially along the flow cavity. The first connecting shafts are detachably connected to the first hub, and the first blades are connected to the first connecting shafts one by one. The second impeller includes a second hub, multiple second connecting shafts, and multiple second blades. The second hub is connected to the corresponding output shaft. The multiple second connecting shafts are arranged around the outer periphery of the second hub and extend radially along the flow cavity. The second connecting shafts are detachably connected to the second hub, and the second blades are connected to the second connecting shafts one by one.

9. The multi-stage booster axial flow fan according to claim 8, characterized in that, The first hub includes multiple sets of first connecting assemblies, which are arranged circumferentially around the central axis of the flow cavity. The second hub includes multiple sets of second connecting assemblies, which are arranged circumferentially around the central axis of the flow cavity. Each set of first connecting assemblies and each set of second connecting assemblies includes two clamping plates, which are connected by bolts. The two clamping plates together form a clamping groove, which is used to clamp the first connecting shaft or the second connecting shaft.

10. The multi-stage booster axial flow fan according to claim 1, characterized in that, The multi-stage booster axial flow fan also includes a mounting base, which is connected to the lower end of the housing.

Images