A square duct fan

Abstract

This utility model discloses a square duct ventilator, comprising: an air outlet cover plate, a bottom shell assembly, a volute assembly, an impeller, and a motor assembly. The bottom shell assembly includes a lower base plate and an air outlet plate and an air inlet plate disposed on both sides of the lower base plate. The air outlet plate has an air outlet, and the air inlet plate has an air inlet. An air outlet cover plate is disposed at the air outlet. The motor assembly includes a motor mounting plate and a motor, which is fixed to the volute assembly via the motor mounting plate. The impeller is disposed within the volute assembly and includes long blades, short blades, a middle disc, a front disc, and a shaft sleeve. The long blades, the front disc, and the middle disc form a long impeller, and the short blades, the front disc, and the middle disc form a short impeller. The long impeller and the short impeller are fixed together by the shaft sleeve. The long impeller is located at the axial distal end of the motor's output shaft, and the short impeller is located at the axial proximal end of the motor's output shaft. The length of the long blades is greater than the length of the short blades. This utility model features high speed, low noise, high air pressure, convenient installation, and simple maintenance.

Description

Technical Field

[0001] This utility model relates to the field of ventilation fan technology, and in particular to a square duct ventilation fan. Background Technology

[0002] Currently, most square duct fans on the market are noisy, have low air volume, low air pressure, and low production efficiency. With increasing customer demands and higher performance requirements, it is necessary to develop a square duct fan that is quieter, has a larger air volume and air pressure, and is also more efficient. Utility Model Content

[0003] The main purpose of this utility model is to provide a square duct ventilation fan with high speed, low noise, high air pressure, convenient installation and simple maintenance.

[0004] To achieve the above objectives, this utility model provides a square duct ventilator, comprising: an air outlet cover, a bottom shell assembly, a volute assembly, an impeller, and a motor assembly;

[0005] The bottom shell assembly includes a lower bottom plate and an air outlet plate and an air inlet plate disposed on both sides of the lower bottom plate. The air outlet plate has an air outlet, the air inlet plate has an air inlet, and an air cover plate is provided at the air outlet.

[0006] The volute assembly is disposed within the bottom shell assembly; the motor assembly includes a motor mounting plate and a motor, the motor being fixed to the volute assembly via the motor mounting plate;

[0007] The impeller is disposed within the volute assembly and is connected to the output shaft of the motor. The impeller includes long blades, short blades, a middle disk, a front disk, and a bushing. The long blades, the front disk, and the middle disk constitute a long impeller, and the short blades, the front disk, and the middle disk constitute a short impeller. The long impeller and the short impeller are fixed together by the bushing. The long impeller is located at the axial distal end of the output shaft of the motor, and the short impeller is located at the axial proximal end of the output shaft of the motor. The length of the long blades is greater than the length of the short blades.

[0008] A further technical solution of this utility model is that the volute assembly includes a lower side plate, a volute, an upper side plate, and a trumpet-shaped air inlet. The volute is spiral-shaped, and the two free ends of the volute are bent into mounting edges and connected to the air outlet plate. The two sides of the volute are respectively connected to the upper side plate and the lower side plate.

[0009] A further technical solution of this utility model is that an upper cover plate is provided at the upper end of the bottom shell assembly, and an L-shaped side plate is provided on one side of the bottom shell assembly.

[0010] A further technical solution of this utility model is that it also includes an electrical box assembly disposed within the bottom shell assembly.

[0011] A further technical solution of this utility model is that the electrical box assembly includes an electrical box, an electrical box cover, and an electrical box mounting plate. The electrical box mounting plate is fixed to the outer wall of the L-shaped side plate and the bottom shell assembly. The electrical box is disposed on the electrical box mounting plate, and the electrical box cover is disposed on the electrical box.

[0012] A further technical solution of this utility model is that sound insulation cotton is provided inside the bottom shell assembly.

[0013] A further technical solution of this utility model is that the sound insulation cotton is made of a UL94 flame-retardant material.

[0014] The beneficial effects of this square duct ventilation fan are:

[0015] 1. The impeller of this utility model, which combines a long impeller and a short impeller, can make full use of the space inside the volute, stabilize aerodynamic performance, and increase air volume;

[0016] 2. In this utility model, the volute adopts a spiral design, which can increase static pressure;

[0017] 3. This utility model uses blind rivets and spot welding to reduce production and installation time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a side view of a preferred embodiment of the square duct ventilation fan of this utility model;

[0020] Figure 2 This is a front view of a preferred embodiment of the square duct ventilation fan of this utility model;

[0021] Figure 3 This is an exploded structural diagram of a preferred embodiment of the square duct ventilation fan of this utility model;

[0022] Figure 4 This is a structural schematic diagram of the bottom shell assembly;

[0023] Figure 5 This is a schematic diagram of the volute assembly;

[0024] Figure 6 This is a schematic diagram of the volute shell structure;

[0025] Figure 7 This is a schematic diagram of the impeller structure;

[0026] Figure 8 This is a structural diagram of the motor assembly;

[0027] Figure 9 This is a structural diagram of the electrical box assembly.

[0028] Explanation of icon numbers:

[0029] Air vent cover 1;

[0030] Air outlet 2;

[0031] Top cover plate 3;

[0032] Bottom shell assembly 4: air outlet plate 41; bottom plate 42; air inlet plate 43; sound insulation cotton 44;

[0033] 5. Volute assembly 5: lower side plate 51, volute 52, upper side plate 53, horn-shaped air inlet 54;

[0034] Impeller 6: Long blades 61; Short blades 62; Middle disc 63; Front disc 64; Shaft sleeve 65;

[0035] Motor assembly 7: Motor mounting plate 71; Motor 72;

[0036] 8. L-shaped side panel;

[0037] Electrical box assembly 9: Electrical box 91; Electrical box cover 92; Electrical box mounting plate 93;

[0038] Air inlet 10.

[0039] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] This utility model proposes a square duct ventilation fan, such as Figures 1 to 9 As shown, the preferred embodiment of the square duct ventilator of this utility model includes a bottom shell assembly 4, a volute assembly 5, an impeller 6, and a motor assembly 7.

[0042] The bottom shell assembly 4 includes a lower bottom plate 42 and an air outlet plate 41 and an air inlet plate 43 disposed on both sides of the lower bottom plate 42. The air outlet plate 41 has an air outlet 2, and the air inlet plate 43 has an air inlet 10. An air outlet cover plate 1 is disposed at the air outlet 2. The air outlet plate 41 and the air inlet plate 43 are spot welded to both sides of the lower bottom plate 42, with four spot welds on each side, which is both firm and reduces installation time.

[0043] The volute assembly 5 is disposed within the bottom shell assembly 4. The motor assembly 7 includes a motor mounting plate 71 and a motor 72, the motor 72 being fixed to the volute assembly 5 via the motor mounting plate 71.

[0044] The motor mounting plate 71 has two tapped holes. The motor 72 is fixed to the motor mounting plate 71 by bolts. The motor assembly 7 is mounted on the volute assembly 5 by the motor 72 mounting bracket.

[0045] The impeller 6 is disposed within the volute assembly 5 and is connected to the output shaft of the motor 72. The impeller 6 includes long blades 61, short blades 62, a middle disk 63, a front disk 64, and a bushing 65. The long blades 61, the front disk 64, and the middle disk 63 form a long impeller, and the short blades 62, the front disk 64, and the middle disk 63 form a short impeller. The long impeller and the short impeller are fixed together as impeller 6 by the bushing 65. The long impeller is located at the axial distal end of the output shaft of the motor 72, and the short impeller is located at the axial proximal end of the output shaft of the motor 72. The length of the long blades 61 is greater than the length of the short blades 62.

[0046] In this embodiment, the impeller 6, which combines the long impeller and the short impeller, can make full use of the space inside the volute 52, stabilize aerodynamic performance, and increase air volume.

[0047] The long impeller can make full use of the relatively smooth airflow in the far end space blocked by the motor mounting plate 71, as described in the principle, to generate greater air volume and pressure. The short impeller has less airflow resistance near the area blocked by the motor 72 support structure, avoiding the aggravation of airflow blockage in this area due to excessively long blades. This combination can more precisely balance the load and flow of the entire impeller 6 channels, increasing air volume and reducing noise.

[0048] The volute assembly 5 includes a lower side plate 51, a volute 52, an upper side plate 53, and a trumpet-shaped air inlet 54. The volute 52 is spiral-shaped and is rolled into an arc shape by a volute plate. The two free ends of the volute 52 are bent into mounting edges and connected to the air outlet plate 41. The two sides of the volute 52 are respectively connected to the upper side plate 53 and the lower side plate 51 by positioning teeth and riveting. This increases the static pressure. The principle is to achieve efficient conversion of kinetic energy into static pressure and minimize flow loss through fluid dynamics optimization.

[0049] In this embodiment, the upper end of the bottom shell assembly 4 is provided with an upper cover plate 3, and one side of the bottom shell assembly 4 is provided with an L-shaped side plate 8.

[0050] In this embodiment, the square duct ventilator also includes an electrical box assembly 9 disposed within the bottom shell assembly 4.

[0051] The electrical box assembly 9 includes an electrical box 91, an electrical box 91 cover, and an electrical box mounting plate 93. The electrical box mounting plate 93 is fixed to the outer wall of the L-shaped side plate 8 and the bottom shell assembly 4. The electrical box 91 is disposed on the electrical box mounting plate 93, and the electrical box 91 cover is disposed on the electrical box 91.

[0052] In this embodiment, the four corners of the electrical box mounting plate 93 are provided with mounting holes, which cooperate with the mounting holes of the bottom shell assembly 4 and the L-shaped side plate 8, so that the electrical box 91 is disposed inside the bottom shell assembly 4, thereby improving electrical safety protection and environmental protection.

[0053] During assembly, the electrical box 91 is placed on the electrical box mounting plate 93. After the wiring is completed, the cover of the electrical box 91 is placed on the electrical box 91. After assembly, the L-shaped side plate 8 and the outer wall of the bottom shell assembly 4 are fixed with self-tapping screws through the mounting holes at the four corners of the electrical box mounting plate 93.

[0054] Furthermore, in this embodiment, a sound-insulating cotton 44 is disposed inside the bottom shell assembly 4. The material of the sound-insulating cotton 44 is a UL94 flame-retardant material.

[0055] In this embodiment, the volute assembly 5 is disposed in the middle of the bottom shell assembly 4, and the inner wall of the bottom shell assembly 4 is covered with the sound insulation cotton 44. The sound insulation cotton 44 is a UL94 flame retardant material. By pasting and fixing it to the inner wall of the bottom shell assembly 4, the noise during operation can be reduced and the safety can be improved.

[0056] The beneficial effects of this square duct ventilation fan are:

[0057] 1. The impeller of this utility model, which combines a long impeller and a short impeller, can make full use of the space inside the volute, stabilize aerodynamic performance, and increase air volume;

[0058] 2. In this utility model, the volute adopts a spiral design, which can increase static pressure;

[0059] 3. This utility model uses blind rivets and spot welding to reduce production and installation time.

[0060] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A square duct ventilation fan, characterized in that, include: Air vent cover, base shell assembly, volute assembly, impeller and motor assembly; The bottom shell assembly includes a lower bottom plate and an air outlet plate and an air inlet plate disposed on both sides of the lower bottom plate. The air outlet plate has an air outlet, the air inlet plate has an air inlet, and an air cover plate is provided at the air outlet. The volute assembly is disposed within the bottom shell assembly; the motor assembly includes a motor mounting plate and a motor, the motor being fixed to the volute assembly via the motor mounting plate; The impeller is disposed within the volute assembly and is connected to the output shaft of the motor. The impeller includes long blades, short blades, a middle disk, a front disk, and a bushing. The long blades, the front disk, and the middle disk constitute a long impeller, and the short blades, the front disk, and the middle disk constitute a short impeller. The long impeller and the short impeller are fixed together by the bushing. The long impeller is located at the axial distal end of the output shaft of the motor, and the short impeller is located at the axial proximal end of the output shaft of the motor. The length of the long blades is greater than the length of the short blades.

2. The square duct ventilator according to claim 1, characterized in that, The volute assembly includes a lower side plate, a volute, an upper side plate, and a trumpet-shaped air inlet. The volute is spiral-shaped, and its two free ends are bent into mounting edges that connect to the air outlet plate. The two sides of the volute are respectively connected to the upper side plate and the lower side plate.

3. The square duct ventilator according to claim 2, characterized in that, The bottom shell assembly is provided with an upper cover plate at its upper end, and an L-shaped side plate is provided on one side of the bottom shell assembly.

4. The square duct ventilator according to claim 3, characterized in that, It also includes an electrical box assembly disposed within the bottom housing assembly.

5. The square duct ventilator according to claim 4, characterized in that, The electrical box assembly includes an electrical box, an electrical box cover, and an electrical box mounting plate. The electrical box mounting plate is fixed to the outer wall of the L-shaped side plate and the bottom shell assembly. The electrical box is disposed on the electrical box mounting plate, and the electrical box cover is disposed on the electrical box.

6. The square duct ventilator according to any one of claims 1 to 5, characterized in that, The bottom shell assembly is equipped with sound insulation cotton.

7. The square duct ventilator according to claim 6, characterized in that, The sound insulation cotton is made of UL94 flame-retardant material.

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