Forward multi-wing centrifugal fan

Abstract

The utility model discloses a forward multi-wing centrifugal fan, which belongs to the technical field of centrifugal fans and comprises a volute, two mounting racks, an outer rotor motor, a fixed shaft and an impeller, the two mounting racks are fixedly arranged on two sides of the volute through bolts and used for supporting the outer rotor motor, the outer rotor motor is positioned in the volute, and the fixed shaft is fixed on the outer rotor motor. The fixing shafts are arranged on the two sides of the outer rotor motor, the impeller is fixedly arranged at the output end of the outer wall of the outer rotor motor, a connecting cylinder is fixedly arranged in the middle of the mounting frame, two positioning blocks are transversely arranged on the outer wall of each fixing shaft, and one end of each fixing shaft is inserted into the corresponding connecting cylinder and extends outwards. The nut cover is arranged at one end of the connecting cylinder in a threaded mode, and one end of the fixing shaft is located in the nut cover; according to the utility model, the external rotor motor in the centrifugal fan can be quickly restrained and mounted on the mounting rack, so that the external rotor motor can be conveniently assembled in the volute, and the external rotor motor can be conveniently assembled and disassembled.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, specifically a forward-curved multi-blade centrifugal fan. Background Technology

[0002] A forward-curved multi-blade centrifugal fan is a type of centrifugal fan. The centrifugal fan motor bracket serves to support the fan motor, and the center of the bracket is coaxial with the motor.

[0003] A typical forward-curved centrifugal fan includes a volute casing, an impeller rotating inside the volute, and an external rotor motor located inside the volute to drive the impeller's rotation. The rotating shaft of the external rotor motor casing is bolted to the impeller.

[0004] In existing forward-curved centrifugal fans, the external rotor motor has its two ends fixedly mounted on the brackets on both sides of the volute. The common method of fixing the fixed shaft to the support is to fasten it with bolts. The bolt removal and installation method requires tools and is time-consuming. Therefore, it is necessary to propose a forward-curved centrifugal fan that is easy to install and remove the fixed shaft. Utility Model Content

[0005] The purpose of this utility model is to provide a forward-curved multi-blade centrifugal fan to at least partially solve the above-mentioned technical problems, facilitate the disassembly of the fixed shaft of the outer rotor motor in the centrifugal fan, and make it convenient to disassemble and assemble the outer rotor motor.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes a volute, a mounting bracket, an external rotor motor, a fixed shaft, and an impeller. Two mounting brackets are fixedly mounted on both sides of the volute by bolts to support the external rotor motor. The external rotor motor is located inside the volute. The fixed shaft is located on both sides of the external rotor motor. The impeller is fixedly mounted on the output end of the outer wall of the external rotor motor. A connecting cylinder is fixedly mounted in the middle of the mounting bracket. Two positioning blocks are laterally arranged on the outer wall of the fixed shaft. One end of the fixed shaft is inserted into the connecting cylinder and extends outward.

[0007] A nut cap is threaded at one end of the connecting cylinder, and one end of the fixed shaft is located inside the nut cap;

[0008] A locking assembly for constraining and fixing the fixed shaft includes a locking cover inserted into one end of the nut cover, a guide block fixedly disposed on the outer wall of the locking cover with one end sliding on the inner wall of the nut cover, a fixing plate fixedly disposed on the inner wall of the locking cover with one end inserted into the fixed shaft, and a return spring disposed inside the nut cover and fixedly connected to the guide block.

[0009] Preferably, the locking cover is hollow, and one end of the nut cap has an annular groove that matches the diameter of the locking cover. One end of the nut cap is inserted into the annular groove, and the outer wall of the locking cover has a circular hole.

[0010] Preferably, the inner wall of the nut cover is provided with a guide groove that matches the guide block, one end of the guide block is inserted into the guide groove and slides, the reset spring is located laterally in the guide groove, and the guide groove communicates with the annular groove.

[0011] Preferably, the inner wall of the nut cover has a through groove that matches the fixing plate, the through groove is connected to the annular groove, and one end of the fixing plate slides within the through groove.

[0012] Preferably, two identical fixing grooves are formed on one end edge of the fixing shaft, and one end of the fixing plate is inserted into the fixing groove through one end of the fixing shaft.

[0013] Preferably, the outer wall of the connecting cylinder is provided with a threaded ring that matches the nut cap. The nut cap is threadedly connected to the outer wall of the threaded nozzle. The nut cap and the outer wall of the connecting cylinder are respectively provided with opposing arrows. When the nut cap and the connecting cylinder are tightly fitted, the two arrows are aligned with each other, and the two fixing plates are opposite to the two fixing grooves.

[0014] Preferably, the connecting cylinder has a horizontally opened positioning groove that matches the positioning block, and one end of the positioning block is inserted into the positioning groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. When assembling the external rotor motor, the fixed shaft on one side of the external rotor motor is inserted into the connecting cylinder. When the positioning block moves to the end of the positioning groove, the fixed plate is inserted into the fixed shaft. Then, the connecting cylinder on the other side of the volute support is inserted into the fixed shaft. When the mounting bracket is in contact with the mounting part of the volute, the mounting bracket is fixed. The two mounting brackets install the external rotor motor and impeller inside the volute. This changes the original method of bolting the external rotor motor fixed shaft and the mounting bracket. The fixed shaft is constrained and fixed by the insertion limit connection method, which makes it easier to assemble the external rotor motor on the volute.

[0017] 2. When using this utility model, pulling the locking cover outward causes the fixing plate on the locking cover to disengage from the inside of the fixing shaft. The guide block on the outer wall of the locking cover pushes the return spring to squeeze together, which is used for the reset function during subsequent installation. When the fixing plate disengages from the inside of the fixing shaft, the round hole on the outer wall of the locking cover is fully exposed. An object can be inserted to block and constrain the locking cover to return to its original position, and the nut cover can be removed from the connecting cylinder. This facilitates the disassembly of the component used to fix the shaft, making it easier to align and maintain. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this embodiment;

[0020] Figure 2 This is a schematic diagram of the connection structure between the fixed shaft and the mounting bracket in this embodiment;

[0021] Figure 3 This is a cross-sectional structural diagram showing the connection between the fixed shaft and the mounting bracket in this embodiment;

[0022] Figure 4 This is an example. Figure 2 A schematic diagram of the enlarged structure A in the diagram;

[0023] Figure 5 This is an example. Figure 3 A schematic diagram of the enlarged B structure in the diagram;

[0024] Figure 6 This is a side view of the nut cover structure in this embodiment.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] 1. Volute; 2. Mounting bracket; 21. Connecting cylinder; 211. Threaded ring; 3. External rotor motor; 31. Fixed shaft; 311. Positioning block; 312. Fixed groove; 32. Impeller; 4. Nut cover; 41. Guide groove; 42. Through groove; 43. Annular groove; 5. Locking assembly; 51. Locking cover; 52. Guide block; 53. Return spring; 54. Fixing plate. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-6This utility model provides a technical solution: a forward-curved multi-blade centrifugal fan, including a volute 1, a mounting bracket 2, an external rotor motor 3, a fixed shaft 31, and an impeller 32. The two mounting brackets 2 are fixedly mounted on both sides of the volute 1 by bolts to support the external rotor motor 3. The external rotor motor 3 is located inside the volute 1. The fixed shaft 31 is set on both sides of the external rotor motor 3. The impeller 32 is fixedly mounted on the output end of the outer wall of the external rotor motor 3. A connecting cylinder 21 is fixedly set in the middle of the mounting bracket 2. Two positioning blocks 311 are arranged laterally on the outer wall of the fixed shaft 31. One end of the fixed shaft 31 is inserted into the connecting cylinder 21 and extends outward.

[0029] The nut cover 4 has a threaded connection at one end of the connecting cylinder 21, and one end of the fixed shaft 31 is located inside the nut cover 4.

[0030] Locking assembly 5, used to constrain and fix the fixed shaft 31, includes a locking cover 51 inserted into one end of the nut cover 4, a guide block 52 fixedly mounted on the outer wall of the locking cover 51 with one end sliding on the inner wall of the nut cover 4, a fixing plate 54 fixedly mounted on the inner wall of the locking cover 51 with one end inserted into the fixed shaft 31, and a return spring 53 fixedly connected to the guide block 52 inside the nut cover 4.

[0031] During the assembly of this fan, firstly, fix one side of the mounting bracket 2 of the volute 1 to the edge. Then, align the fixed shaft 31 of the outer rotor motor 3 located inside the volute 1 with the connecting cylinder 21 on the support frame and insert it into the connecting cylinder 21. The positioning block 311 on the fixed shaft 31 is inserted into the positioning groove inside the connecting cylinder 21, so that one end of the fixed shaft 31 is inserted into the inside of the nut cover 4 through the connecting cylinder 21. At the same time, the fixing groove 312 on the outer wall of the fixed shaft 31 is aligned with the fixing plate 54. When the positioning block 311 moves to the end of the positioning groove... When the fixed plate 54 is inserted into the inside of the fixed shaft 31, the connecting cylinder 21 on the other side of the support frame of the volute 1 is aligned with the fixed shaft 31. When the fixed shaft 31 is inserted into the inside of another nut cover 4, the mounting bracket 2 fits against the mounting part of the volute 1. The two mounting brackets 2 install the external rotor motor 3 and the impeller 32 inside the volute 1. The original method of bolt installation between the fixed shaft 31 of the external rotor motor 3 and the mounting bracket 2 is changed. The fixed shaft 31 is constrained and fixed by the insertion limit connection method, which makes it convenient to assemble the external rotor motor 3 onto the volute 1.

[0032] By inserting the locking cover 51 into the outer wall of the pull nut cover 4, the fixing plate 54 on the inner wall of the locking cover 51 is disengaged from the interior of the fixing shaft 31. The guide block 52 on the outer wall of the locking cover 51 pushes the return spring 53 to squeeze together. When the fixing plate 54 is disengaged from the interior of the fixing shaft 31, the round hole on the outer wall of the locking cover 51 is fully exposed. An object can be inserted to block and constrain the locking cover 51 to return to its original position. The nut cover 4 is threadedly connected to the threaded ring 211 at one end of the connecting cylinder, so the nut cover 4 can be removed from the connecting cylinder 21. This facilitates the disassembly of the component used with the fixing shaft 31, making it easier to align and maintain.

[0033] See figure Figure 2 , Figure 5 and Figure 6 In some embodiments, the locking cover 51 is hollow, and one end of the nut cover 4 is provided with an annular groove 43 that matches the diameter of the locking cover 51. One end of the nut cover 4 is inserted into the annular groove 43, and the outer wall of the locking cover 51 is provided with a round hole.

[0034] The locking cover 51 is hollow and one end of the fixed shaft 31 can extend into the interior of the locking cover 51 to facilitate docking with the fixing plate 54 set inside the locking cover 51. The annular groove 43 opened at one end of the nut cover 4 allows the hollow end of the locking cover 51 to be inserted into the interior of the nut cover 4. The round hole opened on the outer wall of the locking cover 51 is used to restrain the locking cover 51 after it is pulled out, so that the nut cover 4 can be rotated to disengage.

[0035] See Figure 3 and Figure 5 In some embodiments, the inner wall of the nut cover 4 is provided with a guide groove 41 that matches the guide block 52. One end of the guide block 52 is inserted into the guide groove 41 and slides. The reset spring 53 is laterally located in the guide groove 41. The guide groove 41 communicates with the annular groove 43. The inner wall of the nut cover 4 is provided with a through groove 42 that matches the fixing plate 54. The through groove 42 communicates with the annular groove 43. One end of the fixing plate 54 slides in the through groove 42.

[0036] The locking cover 51, which is limited to the inside of the nut cover 4 by the guide groove 41, is used to limit the movement of the guide block 52 inside the nut cover 4 and also to prevent the locking cover 51 from falling off. The reset spring 53 is located in the guide groove 41, with one end fixedly set in the guide groove 41 and the other end fixedly connected to the guide block 52, and is used to push the guide block 52 to push the fixing plate 54 on the locking cover 51 to reset.

[0037] See Figure 2 and Figure 5 In some embodiments, two identical fixing grooves 312 are formed on one end edge of the fixing shaft 31, and one end of the fixing plate 54 is inserted into the fixing groove 312 through one end of the fixing shaft 31.

[0038] See Figure 1 and Figure 2 In some embodiments, the outer wall of the connecting cylinder 21 is provided with a threaded ring 211 that matches the nut cap 4. The nut cap 4 is threadedly connected to the outer wall of the threaded nozzle. The nut cap 4 and the outer wall of the connecting cylinder 21 are respectively provided with opposing arrows. When the nut cap 4 and the connecting cylinder 21 are tightly fitted, the two arrows are aligned with each other, and at the same time, the two fixing plates 54 are opposite to the two fixing grooves 312.

[0039] When installing the nut cover 4, the installation position of the nut cover 4 is determined by the arrow on the outer wall of the nut cover 4 being aligned with the arrow on the outer wall of the connecting cylinder 21. This prevents the fixed end of the locking component 5 inserted into the nut cover 4 from disengaging from the connection angle with the fixing shaft. The installation position of the nut cover 4 can be accurately and quickly confirmed by the arrow markings.

[0040] See Figure 3 In some embodiments, the connecting cylinder 21 has a horizontally opened positioning groove that matches the positioning block 311, and one end of the positioning block 311 is inserted into the positioning groove.

[0041] The positioning groove inside the connecting cylinder 21 allows the fixed shaft 31 of the connecting positioning block 311 to be positioned and installed, so that the two fixed shafts 31 are limited between the two mounting brackets 2, which facilitates the locking component 5 to constrain and fix the two fixed shafts 31.

[0042] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A forward-curved multi-blade centrifugal fan, comprising a volute (1), mounting brackets (2), an external rotor motor (3), a fixed shaft (31), and an impeller (32), wherein two mounting brackets (2) are bolted to both sides of the volute (1) to support the external rotor motor (3), the external rotor motor (3) is located inside the volute (1), the fixed shaft (31) is disposed on both sides of the external rotor motor (3), and the impeller (32) is fixedly disposed on the output end of the outer wall of the external rotor motor (3), characterized in that: A connecting cylinder (21) is fixedly installed in the middle part of the mounting bracket (2), and two positioning blocks (311) are arranged horizontally on the outer wall of the fixed shaft (31). One end of the fixed shaft (31) is inserted into the connecting cylinder (21) and extends outward. The nut cap (4) is threaded at one end of the connecting cylinder (21), and one end of the fixed shaft (31) is located inside the nut cap (4); The locking assembly (5) is used to constrain and fix the fixed shaft (31). The locking assembly (5) includes a locking cover (51) inserted into one end of the nut cover (4), a guide block (52) fixedly disposed on the outer wall of the locking cover (51) with one end sliding on the inner wall of the nut cover (4), a fixing plate (54) fixedly disposed on the inner wall of the locking cover (51) with one end inserted into the fixed shaft (31), and a return spring (53) disposed inside the nut cover (4) and fixedly connected to the guide block (52).

2. The forward-curved multi-blade centrifugal fan according to claim 1, characterized in that: The locking cover (51) is hollow. One end of the nut cover (4) is provided with an annular groove (43) that matches the diameter of the locking cover (51). One end of the nut cover (4) is inserted into the annular groove (43). The outer wall of the locking cover (51) is provided with a round hole.

3. A forward-curved multi-blade centrifugal fan according to claim 1, characterized in that: The inner wall of the nut cap (4) is provided with a guide groove (41) that matches the guide block (52). One end of the guide block (52) is inserted into the guide groove (41) and slides. The reset spring (53) is located laterally in the guide groove (41). The guide groove (41) is connected to the annular groove (43).

4. A forward-curved multi-blade centrifugal fan according to claim 1, characterized in that: The inner wall of the nut cap (4) is provided with a through groove (42) that matches the fixing plate (54). The through groove (42) communicates with the annular groove (43). One end of the fixing plate (54) slides in the through groove (42).

5. A forward-curved multi-blade centrifugal fan according to claim 4, characterized in that: Two identical fixing grooves (312) are provided on one end edge of the fixing shaft (31), and one end of the fixing plate (54) is inserted into the fixing groove (312) through one end of the fixing shaft (31).

6. A forward-curved multi-blade centrifugal fan according to claim 1, characterized in that: The outer wall of the connecting cylinder (21) is provided with a threaded ring (211) that matches the nut cap (4). The nut cap (4) is threaded onto the outer wall of the threaded nozzle. The nut cap (4) and the outer wall of the connecting cylinder (21) are respectively provided with opposing arrows. When the nut cap (4) and the connecting cylinder (21) are tightly fitted, the two arrows are aligned with each other, and at the same time, the two fixing plates (54) are opposite to the two fixing grooves (312).

7. A forward-curved multi-blade centrifugal fan according to claim 1, characterized in that: The connecting cylinder (21) has a horizontally opened positioning groove that matches the positioning block (311), and one end of the positioning block (311) is inserted into the positioning groove.

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