Anti-blocking pressure relief axial flow fan

Abstract

The utility model discloses an anti-blocking pressure relief axial flow fan which comprises a cylindrical shell, a motor, a spring and an annular valve body, the motor is horizontally arranged in the cylindrical shell, an impeller is arranged on a rotating shaft of the motor, a check ring located in front of the impeller is arranged on the outer circle of the cylindrical shell, and the annular valve body is arranged on the check ring. A check ring is arranged in the cylindrical shell, a valve sleeve which extends forwards and is concentric with the cylindrical shell is arranged on the edge of the check ring, an annular containing cavity is formed between the valve sleeve and the outer circle of the cylindrical shell, the annular valve body is arranged in the annular containing cavity, a first flange is arranged at the front end of the cylindrical shell, and the spring is arranged between the first flange and the annular valve body. A pressure relief blind groove extending forwards from the rear end is formed in the outer circle of the annular valve body in an inwards-concave mode, and pressure relief holes communicated with the annular containing cavity are formed in the cylindrical shell at intervals. According to the anti-blocking pressure relief axial flow fan, pressure relief can be conducted through the pressure relief blind groove when airflow in a pipeline is not smooth or the pipeline is blocked, and flowing of the airflow in the cylindrical shell is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of axial flow fans, in particular to an anti-blocking and pressure-relieving axial flow fan. Background Art

[0002] The motor of an axial flow fan can be placed inside the casing, and the motor drives the rotation of the impeller, making the direction of the airflow parallel to the axis of the motor. Axial flow fans can facilitate the airflow to dissipate heat from the motor, and have relatively high operating stability.

[0003] Axial flow fans are suitable for applications requiring high airflow rates and facilitate airflow delivery through ducts. However, if the duct is bent or clogged, air can accumulate and be blocked, causing the motor to idle. This increases motor heat and prevents proper heat dissipation due to poor airflow, making the motor susceptible to damage and requiring improvement. Utility Model Content

[0004] The utility model aims to provide an anti-blocking and pressure-relieving axial flow fan, which can relieve pressure when the airflow in the pipeline is not smooth, thereby avoiding the problem that the motor cannot dissipate heat.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A blockage-proof and pressure-relieving axial flow fan comprises: a cylindrical shell, a motor, a spring and an annular valve body, the motor being horizontally arranged in the cylindrical shell, an impeller being arranged on the rotating shaft of the motor, a retaining ring being arranged on the outer circle of the cylindrical shell and located in front of the impeller, a valve sleeve being arranged on the edge of the retaining ring and extending forward and being concentric with the cylindrical shell, an annular cavity being formed between the valve sleeve and the outer circle of the cylindrical shell, the annular valve body being arranged in the annular cavity, a first flange being arranged at the front end of the cylindrical shell, the spring being arranged between the first flange and the annular valve body, a pressure-relief blind groove being arranged inwardly on the outer circle of the annular valve body and extending forward from the rear end, and pressure-relief holes communicating with the annular cavity being arranged at intervals on the cylindrical shell.

[0007] Wherein, the annular valve body is provided with a stopper located in front of the valve sleeve.

[0008] Wherein, a second flange is provided at the rear end of the cylindrical shell.

[0009] Wherein, a bracket for fixing the motor is provided in the cylindrical shell.

[0010] The front end of the annular valve body is concavely provided with a first positioning hole corresponding to the spring, and the rear end of the first flange is concavely provided with a second positioning hole corresponding to the spring.

[0011] Wherein, a first sealing ring is provided on the outside of the annular valve body and is located in front of the pressure relief blind groove.

[0012] Wherein, a second sealing ring is provided on the outer circle of the cylindrical shell inside the annular valve body.

[0013] Wherein, a fixing seat is provided at the bottom of the cylindrical shell.

[0014] The beneficial effects of the utility model are as follows: a blockage-proof and pressure-relieving axial flow fan drives the rotation of the impeller by a motor to generate a forward-flowing airflow in the cylindrical shell. If the airflow in the pipeline is not smooth or is blocked, the air pressure in front of the impeller in the cylindrical shell will increase rapidly, and the air pressure in the annular cavity will increase accordingly and push the annular valve body forward. The pressure is relieved by using the front end of the pressure-relieving blind groove exposed from the valve sleeve to ensure the flow of airflow in the cylindrical shell and effectively dissipate heat from the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 yes Figure 1 A partial enlarged view of part A;

[0017] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle annular valve body moving forward to relieve pressure. DETAILED DESCRIPTION

[0018] The following combination Figures 1 to 3 The technical solution of the present utility model is further illustrated by specific embodiments.

[0019] like Figure 1 and Figure 3 The anti-blocking and pressure-relieving axial flow fan includes a cylindrical housing 1, a motor 2, a spring 16, and an annular valve body 6. The motor 2 is horizontally arranged in the cylindrical housing 1. The cylindrical housing 1 is provided with a bracket 3 for fixing the motor 2. The motor 2 can be fixed in the cylindrical housing 1 by bolts. A fixing seat 8 is provided at the bottom of the cylindrical housing 1 to fix the cylindrical housing 1.

[0020] An impeller 4 is mounted on the rotating shaft of the motor 2. The motor 2 drives the impeller's rotation, generating a forward-flowing axial airflow within the cylindrical housing 1. A first flange 7 is mounted at the front end of the cylindrical housing 1. This flange can be connected to an external pipe for further airflow transport. A second flange 10 is mounted at the rear end of the cylindrical housing 1. This second flange 10 can be connected to an external filter device to filter the airflow entering the cylindrical housing 1.

[0021] like Figure 1As shown, a retaining ring 11 is provided on the outer circumference of the cylindrical shell 1, located in front of the impeller 4. In this embodiment, the retaining ring 11 can be welded to the outer circumference of the cylindrical shell 1, which provides a stable structure. A valve sleeve 5 is provided on the edge of the retaining ring 11, extending forward and concentric with the cylindrical shell 1. An annular cavity 12 is formed between the valve sleeve 5 and the outer circumference of the cylindrical shell 1. The annular valve body 6 is disposed in the annular cavity 12. A first sealing ring 14 is provided on the outside of the annular valve body 6, located in front of the pressure relief blind groove 13. A second sealing ring 19 is provided on the inside of the annular valve body 6, located on the outer circumference of the cylindrical shell 1, to provide a movable seal for the annular valve body 6 and prevent air leakage in the annular cavity 12.

[0022] like Figure 2 As shown, the cylindrical shell 1 is provided with pressure relief holes 9 connected to the annular cavity 12 at intervals. If the air flow in the pipeline is not smooth or blocked, the air pressure in front of the impeller 4 in the cylindrical shell 1 will increase rapidly, and the air pressure in the annular cavity 12 will increase accordingly and push the annular valve body 6 forward.

[0023] A pressure relief blind groove 13 extending forward from the rear end is provided on the outer circle of the annular valve body 6. Figure 3 As shown, after the annular valve body 6 moves forward, the front end of the pressure relief blind groove 13 exposes the valve sleeve 5 to relieve the pressure of the annular cavity 12 and the cylindrical shell 1, ensuring the flow of air in the cylindrical shell 1 and effectively dissipating the heat of the motor 2.

[0024] To limit the position of the annular valve body 6 during normal operation and reset it after forward movement, a spring 16 is positioned between the first flange 7 and the annular valve body 6, providing elastic support for the annular valve body 6 in its rearward direction. Only when the air pressure within the annular cavity 12 is high can the annular valve body 6 be pushed forward, compressing the spring 16 and maintaining the pressure of the airflow output by the cylindrical housing 1. In this embodiment, a stopper 15 is provided on the annular valve body 6, located in front of the valve sleeve 5, to reset the annular valve body 6 in its rearward movement and prevent blockage of the pressure relief hole 9.

[0025] like Figure 3 As shown, the front end of the annular valve body 6 is recessed with a first positioning hole 18 corresponding to the spring 16, and the rear end of the first flange 7 is recessed with a second positioning hole 17 corresponding to the spring 16. These holes position the ends of the spring 16 and improve the positional stability of the spring 16. By using 2 to 8 springs 16 in a circular array, the force applied to the annular valve body 6 is evenly distributed, preventing sticking and increasing operational reliability.

[0026] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. An anti-blocking and pressure-relieving axial flow fan, characterized in that: include: A cylindrical shell, a motor, a spring and an annular valve body, the motor is horizontally arranged in the cylindrical shell, an impeller is arranged on the rotating shaft of the motor, a retaining ring is arranged on the outer circle of the cylindrical shell and is located in front of the impeller, a valve sleeve is provided on the edge of the retaining ring and extends forward and is concentric with the cylindrical shell, an annular cavity is formed between the valve sleeve and the outer circle of the cylindrical shell, the annular valve body is arranged in the annular cavity, a first flange is provided at the front end of the cylindrical shell, the spring is arranged between the first flange and the annular valve body, a pressure relief blind groove extending forward from the rear end is provided inwardly on the outer circle of the annular valve body, and pressure relief holes communicating with the annular cavity are provided at intervals on the cylindrical shell.

2. The anti-blocking and pressure-relieving axial flow fan according to claim 1, characterized in that: The annular valve body is provided with a stopper located in front of the valve sleeve.

3. The anti-blocking and pressure-relieving axial flow fan according to claim 1, characterized in that: A second flange is provided at the rear end of the cylindrical shell.

4. The anti-blocking and pressure-relieving axial flow fan according to claim 1, characterized in that: A bracket for fixing the motor is arranged in the cylindrical shell.

5. The anti-blocking and pressure-relieving axial flow fan according to claim 1, characterized in that: The front end of the annular valve body is concavely provided with a first positioning hole corresponding to the spring, and the rear end of the first flange is concavely provided with a second positioning hole corresponding to the spring.

6. The anti-blocking and pressure-relieving axial flow fan according to claim 1, characterized in that: A first sealing ring is provided on the outside of the annular valve body and is located in front of the pressure relief blind groove.

7. The anti-blocking and pressure-relieving axial flow fan according to claim 1, characterized in that: A second sealing ring is provided inside the annular valve body and is located on the outer circle of the cylindrical shell.

8. The anti-blocking and pressure-relieving axial flow fan according to claim 1, characterized in that: A fixing seat is provided at the bottom of the cylindrical shell.

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