External axial flow fan
By using a threaded rod and a screw-nut design, the problem of the mounting plate tilting in the external axial flow fan is solved, enabling control of the mounting bracket's levelness and adaptive adjustment of the protective cover, thus improving the stability and ease of maintenance of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2026-03-20
AI Technical Summary
In existing external axial flow fans, it is difficult to keep the four corners of the mounting plate at the same height, which causes the mounting plate to tilt, affecting the belt tension adjustment and the stability of the motor.
The design employs a threaded rod and a screw with a nut. The position of the mounting bracket is pre-fixed by the threaded rod, ensuring that the positions of the four corners of the mounting bracket are determined. The stability of the mounting bracket is enhanced by limit posts and support plates. At the same time, the protective cover is adjustable in length to accommodate different belt lengths, ensuring the proper tension of the belt.
The system enables level control of the mounting bracket, ensuring proper belt tension and effective protection from the protective cover. This reduces the requirements for belt length and improves motor stability and ease of maintenance.
Smart Images
Figure CN224017419U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fan equipment, and more specifically, it relates to an external axial flow fan. Background Technology
[0002] Axial flow fans are a common type of fan. They generate airflow or fluid flow by axially flowing gas or liquid. Existing axial flow fans are divided into external axial flow fans and internal axial flow fans according to the location of the motor. External axial flow fans have the motor installed above the fan. This makes it easier to maintain the motor without having to disassemble the fan casing, and it also improves the overall heat dissipation efficiency of the motor.
[0003] Some external axial flow motors drive the impeller via a belt. Therefore, the belt tension affects the motor's transmission efficiency. To ensure belt tension, the motor is fixed to a mounting plate with four through holes near its four corners. Four threaded posts, each passing through one of the four through holes, are fixed to the top of the fan casing. Two nuts are threaded onto each post, with the nuts abutting the top and bottom of the mounting plate. The belt tension is adjusted by changing the height of the mounting plate, and the stability of the mounting plate is ensured by tightening the nuts on the four threaded posts. However, the nuts on the four threaded posts are tightened separately, making it difficult to control the height of the four corners of the mounting plate consistently, which can cause the mounting plate to tilt.
[0004] Therefore, a new solution is needed to address this problem. Utility Model Content
[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an external axial flow fan.
[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an external axial flow fan includes a housing and a motor located above the housing. A support base is fixedly connected to the housing, and a mounting frame is provided above the support base. A cavity is opened in the side wall of the mounting frame. The motor is fixedly connected to the upper side of the mounting frame. A threaded rod is rotatably connected to the center of the support base. Four screws are also fixedly connected to the support base, respectively located near the four corners of the support base. A threaded hole and four through holes are opened on the bottom surface of the mounting frame. Four through holes are opened on the top surface of the mounting frame, each corresponding to one of the through holes. The corresponding through holes are used to be passed through by the same screw. Two nuts are threadedly connected to the screw, respectively for contacting the upper and lower sides of the mounting frame.
[0007] The utility model further sets up: six corner spare is fixedly connected on the threaded rod, six corner spare is close to the upper top surface of support base setting, the threaded rod is fixedly connected with the limit post one end of back to support base.
[0008] The utility model further sets up: four support plates that cross section is L shape are provided in the cavity, the upper and lower both ends of support plate are fixedly connected with the upper and lower two inner walls of cavity, support plate is close to screw rod setting.
[0009] The utility model further sets up: the installation frame is rectangle setting, the length of installation frame is at least two times of width, the distance between the two openings of cavity is equal to the width of installation frame.
[0010] The utility model further sets up: the motor is equipped with the belt for driving impeller rotation, the shell is fixedly connected with the protective cover for protecting the belt, the length of protective cover along the vertical direction is adjustable.
[0011] The utility model further sets up: the protective cover includes fixed cover and sliding cover, one end of fixed cover is fixedly connected with the shell, the side of fixed cover back to the shell is equipped with sliding groove, the sliding cover is connected in sliding groove, both sides of protective cover are equipped with long groove that communicates with sliding groove, both sides of sliding cover are equipped with the limiting piece in long groove, the limiting piece is used for limiting the sliding of sliding cover in sliding groove.
[0012] The utility model further sets up: the limiting piece is screw column, both sides of sliding cover are equipped with perforation, the inner thread is provided on the inner wall of perforation, the screw column is connected in perforation, the end of screw column back to sliding cover is fixedly connected with the handle outside long groove.
[0013] Above all, the utility model has following beneficial effect: threaded rod first to the position of installation frame plays the role of pre-fixing, makes the position of four corners of installation frame has been determined, at this moment, people only need to tighten the nut on screw rod, guarantees the fixed strength of installation frame, guarantees the levelness of installation frame by this setting, the length of protective cover can be determined according to the position of motor in vertical direction, thereby makes protective cover and belt more closely, guarantees the protection effect of protective cover, and through above-mentioned setting makes that fan can adapt to different length belt, thereby reduce the requirement of fan to the length of belt. ACCURACY OF DRAWINGS
[0014] Figure 1 It is the structural schematic diagram of the utility model;
[0015] Figure 2 It is Figure 1 The enlarged schematic diagram of A part in;
[0016] Figure 3 The partial structure schematic view of the utility model.
[0017] In the figure: 1, the shell; 2, motor; 3, support seat; 4, mounting bracket; 5, cavity; 6, threaded rod; 7, screw rod; 8, nut; 9, hex piece; 10, limiting column; 11, support plate; 12, fixed cover; 13, sliding cover; 14, long slot; 15, threaded column; 16, handle. DETAILED DESCRIPTION
[0018] The utility model is described in detail below in combination with the drawings and examples.
[0019] External axial flow fan, such as Figure 1 and Figure 3 As shown, including shell 1 and the motor 2 located above shell 1, the motor 2 is equipped with the belt for driving the rotation of impeller, shell 1 is fixedly connected with support seat 3, the upper portion of support seat 3 is equipped with mounting bracket 4, the sidewall of mounting bracket 4 is provided with cavity 5, and the left and right two sidewalls of cavity 5 are communicated with mounting bracket 4, and the upper side of mounting bracket 4 is fixedly connected with motor 2 through screw, and the center of support seat 3 is rotatably connected with a threaded rod 6, and four screw rods 7 are further fixedly connected on support seat 3, and the bottom surface of mounting bracket 4 is provided with a threaded hole and four through holes one, and the top surface of mounting bracket 4 is provided with four through holes two corresponding with through hole one, and the corresponding through hole one and through hole two are used to be passed through by the same screw rod 7, and the diameter of through hole one and through hole two is greater than the major diameter of screw rod 7, and two nuts 8 are threadedly connected on screw rod 7 for being in contact with the upper and lower sides of mounting bracket 4, people first install motor 2 on the upper side of mounting bracket 4, then adopt the belt to connect motor 2 and impeller together, finally adjust the position of motor 2 in vertical direction, so that the belt keeps reasonable tightness, people first rotate the threaded rod 6 located at the center position of support seat 3, because threaded rod 6 is threadedly connected with the threaded hole on mounting bracket 4, and the four screw rods 7 passing through through hole one and through hole two can also guide the movement of mounting bracket 4, so that mounting bracket 4 moves along the length direction of threaded rod 6, thereby making the belt reach appropriate tightness, and mounting bracket 4 is always in horizontal state during the movement, when the tightness of belt is adjusted, people twist the two nuts 8 on screw rod 7, so that the two nuts 8 are in contact with the upper and lower sides of mounting bracket 4, twist the nuts 8 on the four screw rods 7, thereby completing the fixation of the position of mounting bracket 4, threaded rod 6 first pre-fixes the position of mounting bracket 4, so that the positions of four corners of mounting bracket 4 have been determined, at this moment, people only need to tighten the nuts 8 on screw rod 7 to ensure the fixation strength of mounting bracket 4, and the horizontal degree of mounting bracket 4 is ensured by the arrangement.
[0020] As Figure 1 and Figure 3As shown, the threaded rod 6 is fixedly connected with a hexagonal piece 9, the hexagonal piece 9 is arranged close to the upper top surface of the support base 3, the threaded rod 6 is fixedly connected with a limiting column 10 at the end away from the support base 3, the diameter of the limiting column 10 is larger than the diameter of the threaded hole, people hold the hexagonal piece 9 by the adjustable wrench, then rotate the hexagonal piece 9, thereby driving the threaded rod 6 to rotate, the limiting column 10 is arranged so that the upper end of the threaded rod 6 will not be out of the mounting rack 4, four support plates 11 with L-shaped cross section are arranged in the cavity 5, the upper and lower ends of the support plates 11 are fixedly connected with the upper and lower inner walls of the cavity 5 respectively, the support plates 11 are arranged close to the screw rod 7, the support plates 11 make the deformation amount of the positions of the upper and lower inner walls of the cavity 5 close to the corners not too large, thereby ensuring the integrity of the mounting rack 4, the mounting rack 4 is arranged in a rectangular shape, the length of the mounting rack 4 is at least twice the width, the distance between the two openings of the cavity 5 is equal to the width of the mounting rack 4, in this embodiment, the length of the mounting rack 4 is twice the width, this arrangement makes the width of the two openings of the cavity 5 relatively wide, thereby ensuring the range of rotation of the adjustable wrench, making it more convenient to rotate the hexagonal piece 9 by the adjustable wrench.
[0021] As Figure 1 and Figure 2As shown, the shell 1 is fixedly connected with a protective cover for protecting the belt, the length of the protective cover in the vertical direction is adjustable, the length of the protective cover can be determined according to the position of the motor 2 in the vertical direction, so that the protective cover is more fitted with the belt, the protection effect of the protective cover is guaranteed, and through the above setting, the fan can adapt to the belts of different lengths, thereby reducing the requirement of the fan for the length of the belt, the protective cover comprises a fixed cover 12 and a sliding cover 13, one end of the fixed cover 12 is fixedly connected with the shell 1, a sliding groove is formed in the side of the fixed cover 12 away from the shell 1, the sliding cover 13 is slidingly connected in the sliding groove, long grooves 14 communicating with the sliding groove are formed in the two sides of the protective cover, limiting pieces located in the long grooves 14 are arranged on the two sides of the sliding cover 13, the limiting pieces are used for limiting the sliding of the sliding cover 13 in the sliding groove, the length of the protective cover can be adjusted by sliding the sliding cover 13 in the sliding groove, the limiting piece is a threaded column 15, a through hole is formed in the two sides of the sliding cover 13, an internal thread is arranged on the inner wall of the through hole, the threaded column 15 is threadedly connected in the through hole, a handle 16 located outside the long groove 14 is fixedly connected to the end of the threaded column 15 away from the sliding cover 13, when a person needs to slide the sliding cover 13, the person holds the handle 16 and rotates the threaded column 15, so that the threaded column 15 moves away from the fixed cover 12, so that the end of the threaded column 15 is not abutted against the inner wall of the sliding groove, so that the threaded column 15 can drive the sliding cover 13 to slide in the sliding groove, when the sliding cover 13 is slid to a suitable position, the person rotates the threaded column 15, so that the threaded column 15 moves toward the fixed cover 12, so that the end of the threaded column 15 is abutted against the bottom wall of the sliding groove, so that the sliding cover 13 is limited in the sliding groove through the friction force between the threaded column 15 and the inner wall of the sliding groove, thereby completing the fixation of the sliding cover 13 in the sliding groove.
[0022] The preferred embodiments of the utility model are described above, the protection scope of the utility model is not limited to the above-mentioned embodiments only, any technical scheme under the idea of the utility model belongs to the protection scope of the utility model. It should be noted that for ordinary skilled persons in the art, some improvements and decorations without departing from the principle of the utility model can also be considered as the protection scope of the utility model.
Claims
1. An external axial flow fan, characterized in that: The device includes a housing (1) and a motor (2) located above the housing (1). A support base (3) is fixedly connected to the housing (1). A mounting bracket (4) is provided above the support base (3). A cavity (5) is opened on the side wall of the mounting bracket (4). The motor (2) is fixedly connected to the upper side of the mounting bracket (4). A threaded rod (6) is rotatably connected to the center of the support base (3). Four screws (7) are also fixedly connected to the support base (3) and are respectively located near the four corners of the support base (3). A threaded hole and four through holes I are opened on the bottom surface of the mounting bracket (4). Four through holes II are opened on the top surface of the mounting bracket (4) and are respectively located corresponding to the through holes I. The corresponding through holes I and through holes II are used to be passed through by the same screw (7). Two nuts (8) are threadedly connected to the screw (7) and are respectively used to abut against the upper and lower sides of the mounting bracket (4).
2. The external axial flow fan according to claim 1, characterized in that: A hexagonal piece (9) is fixedly connected to the threaded rod (6). The hexagonal piece (9) is located near the top surface of the support base (3). A limit post (10) is fixedly connected to one end of the threaded rod (6) facing away from the support base (3).
3. The external axial flow fan according to claim 2, characterized in that: The cavity (5) is provided with four L-shaped support plates (11). The upper and lower ends of the support plates (11) are fixedly connected to the upper and lower inner walls of the cavity (5) respectively. The support plates (11) are located close to the screw (7).
4. The external axial flow fan according to claim 3, characterized in that: The mounting bracket (4) is rectangular in shape, and the length of the mounting bracket (4) is at least twice the width. The distance between the two openings of the cavity (5) is equal to the width of the mounting bracket (4).
5. The external axial flow fan according to claim 1, characterized in that: The motor (2) is provided with a belt for driving the impeller to rotate, and a protective cover for protecting the belt is fixedly connected to the housing (1). The length of the protective cover in the vertical direction is adjustable.
6. The external axial flow fan according to claim 5, characterized in that: The protective cover includes a fixed cover (12) and a sliding cover (13). One end of the fixed cover (12) is fixedly connected to the outer shell (1). A sliding groove is provided on the side of the fixed cover (12) facing away from the outer shell (1). The sliding cover (13) is slidably connected in the sliding groove. Both sides of the protective cover are provided with long grooves (14) communicating with the sliding groove. Both sides of the sliding cover (13) are provided with limiting members located in the long grooves (14). The limiting members are used to restrict the sliding of the sliding cover (13) in the sliding groove.
7. The external axial flow fan according to claim 6, characterized in that: The limiting component is a threaded column (15). Both sides of the sliding cover (13) are provided with through holes. The inner wall of the through hole is provided with internal threads. The threaded column (15) is threadedly connected in the through hole. The end of the threaded column (15) facing away from the sliding cover (13) is fixedly connected to a handle (16) located outside the long groove (14).