Anti-surge diffuser of tunnel fan

Abstract

The utility model discloses an anti-surge diffuser of a tunnel fan, which relates to the technical field of anti-surge of tunnel fans and comprises a fixed ring, rollers, a rotating ring and guide vanes, the rotating ring is arranged on the inner side of the circumference of the fixed ring, a plurality of rollers are circumferentially arranged between the rotating ring and the fixed ring, and a plurality of guide vanes are uniformly fixed on the inner side of the circumference of the rotating ring. The rotating ring can rotate relative to the fixed ring; the roller comprises a roller and two pin shafts corresponding to the roller, the roller is a tubular cylinder, the two pin shafts are coaxially sleeved in the roller from the two sides of a cylinder opening of the roller respectively, one side of each pin shaft is provided with a cavity, and the cavities of the two pin shafts are oppositely arranged; the two pin shaft cavities in the roller are connected to form a cavity, and fluid is arranged in the cavity; the damping effect is achieved through the design of the roller cavity, and the capacity of dynamically balancing wind pressure is achieved through the design of the rotating ring.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-surge of tunnel fans, in particular to an anti-surge diffuser for tunnel fans. Background Art

[0002] Fan anti-surge devices are widely used in industry. Their primary function is to prevent fans from entering an unstable surge state under low-flow, high-pressure conditions. Surge is an aerodynamic phenomenon characterized by periodic oscillations of the fluid within the fan, potentially causing serious damage to the fan or even system shutdown. Therefore, the anti-surge device's primary task is to maintain stable fan operation by controlling intake air flow and pressure.

[0003] Prior art anti-surge devices typically rely on fixed mechanical structures to adjust the fluid. For example, the subway axial flow fan spin-molded integral anti-surge device described in Patent Application Publication No. 2017201231924 utilizes multiple guide vanes to prevent the occurrence of surges through the contact surface between the guide vanes and the fluid, and utilizes a conical ring to stabilize the fluid, thereby stabilizing the fan pressure and reducing fan surges. This type of device can effectively prevent fan surge to a certain extent. However, prior art anti-surge devices still have the following shortcomings:

[0004] (1) Existing anti-surge devices generally lack effective damping capacity. When a fan surges, fluid dynamic instability may cause system vibrations. Existing anti-surge devices cannot provide sufficient damping to slow down or eliminate these vibrations, which may cause long-term damage to the equipment.

[0005] (2) These devices can only prevent surge from occurring, but cannot prevent the spread of surge that has already occurred. When the fan enters the surge state, the control mechanism of the anti-surge device may not respond quickly, causing the surge phenomenon to spread within the system, affecting the stability and safety of the entire production process;

[0006] (3) Existing surge suppressors have limited ability to stabilize airflow in response to changes in airflow. In actual operation, the fan's operating conditions fluctuate with changes in load. Traditional surge suppressors perform poorly in dealing with such dynamic changes and are unable to effectively regulate airflow to maintain system stability. This not only affects fan efficiency but can also lead to frequent system adjustments and maintenance, increasing operating costs.

[0007] Therefore, based on the shortcomings of the surge protector in the prior art, it is necessary to further improve the prior art to enhance the overall stability and reliability of the fan system. Utility Model Content

[0008] The utility model aims to provide a tunnel fan anti-surge diffuser to solve the above problems.

[0009] The utility model is achieved through the following technical solutions:

[0010] A tunnel fan anti-surge diffuser includes a fixed ring, a roller, a rotating ring, and guide vanes. The rotating ring is arranged inside the circumference of the fixed ring. A plurality of rollers are arranged on the circumference between the rotating ring and the fixed ring. A plurality of guide vanes are evenly fixed on the inner circumference of the rotating ring. The rotating ring can rotate relative to the fixed ring.

[0011] In general, the tunnel fan anti-surge diffuser includes a fixed ring, a roller, a rotating ring and guide vanes. The fixed ring is coaxially fixed to the inner wall of the wind tube, and multiple rollers are arranged on the circumference of the inner ring. The axis of the roller is parallel to the axis of the fixed ring and can rotate in the mounting groove. The rotating ring is coaxially arranged on the inner side of the fixed ring and can rotate on the basis of the rotating wheel. The middle shaft section of the roller is recessed in the annular groove. The roller and the pin constitute the roller. The internal chamber contains mineral oil to provide a damping effect, reducing surge when the fan is started or shut down. Multiple guide vanes (with an inclination angle of 5-15 degrees) are arranged on the inner wall of the rotating ring. When the fluid passes through, the large contact area with the blades reduces surge, and the rotating ring stabilizes the wind pressure when the air pressure is unstable, preventing fluid backflow and fan surge.

[0012] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0013] 1. While existing anti-surge diffusers can prevent fan surge to a certain extent, they still have several shortcomings. First, these devices generally lack damping capacity. When a fan surges, existing anti-surge diffusers cannot provide sufficient damping to slow or eliminate the vibration. As a result, system vibrations may persist, causing long-term damage to the equipment. Second, existing anti-surge devices can only prevent surges from occurring but cannot promptly control surges that have already occurred. Once a fan enters a surge state, existing anti-surge diffusers have a slow response speed, which may cause surges to spread throughout the system, affecting the stability and safety of the production process. In addition, existing anti-surge diffusers have limited flow stabilization capabilities in response to airflow changes. Fan operating conditions fluctuate with load changes, and traditional anti-surge diffusers perform poorly in handling such dynamic changes, making it difficult to effectively regulate airflow to maintain system stability. This not only affects fan efficiency but can also lead to frequent system adjustments and maintenance, increasing operating costs. Therefore, although existing technologies provide some surge protection, there is still room for improvement in practical applications.

[0014] The utility model prevents the fan from surging during operation through the combined effects of a fixed ring, rollers, a rotating ring and guide vanes. The design of this device not only utilizes a mechanical structure, but also realizes its function through the principles of fluid mechanics. First, the fixed ring is coaxially fixed to the inner wall of the wind tube of the tunnel fan, and a plurality of rollers are provided on its inner ring. The axis of the roller is parallel to the axis of the fixed ring and is installed in the mounting groove of the fixed ring. These rollers can rotate freely in the mounting position of the fixed ring. A rotating ring is coaxially provided on the inner side of the fixed ring, and the roller is located between the rotating ring and the fixed ring. With this design, the rotating ring can rotate freely relying on the rollers;

[0015] A significant advantage of this design is that the roller has a fluid chamber inside, which is filled with mineral oil but not completely filled. This gives the roller a certain damping effect, which can effectively suppress the surge phenomenon of the tunnel fan. When the fan starts or shuts down, the rapid change of the motor frequency may cause the entire unit to surge. Multiple rollers can act as tiny damping units to reduce this phenomenon.

[0016] In addition, multiple guide vanes are positioned around the inner wall of the rotating ring. These vanes are tilted relative to the axis of the rotating ring, with the angle ranging from 5 to 15 degrees. As the fluid in the tunnel fan passes through the rotating ring, the large contact area between the fluid and the multiple guide vanes effectively reduces fan surge. These guide vanes not only stabilize the flow of the fluid but also balance changes in wind pressure through passive rotation, preventing phenomena such as increased rotor push resistance and fluid backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0018] Figure 1 This is a cutting diagram of the embodiment installed on the fan;

[0019] Figure 2 This is a cutting diagram of this embodiment;

[0020] Figure 3 for Figure 2 Detailed diagram at point A in the middle;

[0021] Figure 4 Schematic diagram of the outer ring and roller arrangement;

[0022] Figure 5 for Figure 4 Detailed diagram at point B in the middle;

[0023] Figure 6 This is a diagram of the roller disassembly.

[0024] The reference numerals represent: 1-tunnel fan, 2-muffler, 3-anti-vibration diffuser, 4-fixing ring, 5-pin shaft, 6-blade, 7-rotating ring, 8-roller, 9-annular groove. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0026] like Figures 1 to 6 As shown, this embodiment relates to an anti-surge diffuser for a tunnel fan 1, comprising a fixed ring 4, a roller, a rotating ring 7 and a guide vane 6, wherein the fixed ring 4 is coaxially fixed to the inner wall of the wind tube of the tunnel fan 1 ( Figure 1 This is a cutaway diagram of a tunnel fan 1 with a silencer 2, inside of which is installed the anti-vibration diffuser 3 of this embodiment). The inner ring of the fixed ring 4 is also circumferentially provided with multiple rollers, the axes of the rollers are parallel to the axis of the fixed ring 4, and the rollers can rotate in the installation position of the fixed ring 4. A rotating ring 7 is also coaxially provided on the inner side of the circumference of the fixed ring 4, and the rollers are arranged between the rotating ring 7 and the fixed ring 4. The rotating ring 7 can rotate relying on the rotating wheels.

[0027] Specifically, the inner wall circumference of the fixing ring 4 is provided with a plurality of mounting grooves (the mounting grooves are arc grooves of uniform size, and their extending direction is consistent with the axis direction of the fixing ring 4). Each mounting groove is also rotatably connected to a roller, and mounting portions (shaft-shaped ends) are correspondingly provided at both ends of the roller axis. The roller is rotatably arranged in the mounting groove corresponding to it through the mounting portion, and the roller can rotate in the mounting groove;

[0028] Furthermore, the middle shaft section of the fixed ring 4 is provided with a plurality of mounting grooves, which are radially recessed outward to form an annular groove 9. The annular groove 9 is used to provide an accommodating space for the position of the middle shaft section of the roller; specifically, the roller is composed of a roller 8 and two corresponding pins 5. The two pins 5 are respectively sleeved into the roller 8 from the two end mouths of the roller 8. A cavity is provided at one end of the pin 5. The cavities of the two pins 5 arranged in the roller 8 are arranged opposite to each other. The two pins 5 extend along the two ends of the axis of the roller 8 and are arranged beyond the two ends of the axis of the roller 8 to form a mounting portion. The roller 8 is rotatably connected to the mounting groove of the fixed ring 4 through the mounting portions at both ends, and the thicker shaft section of the roller 8 is accommodated in the annular groove 9.

[0029] In addition, the cavities of the two pins 5 are connected inside the drum 8 to form a chamber, and a fluid is provided inside the chamber (the fluid in the chamber inside the roller of the embodiment is mineral oil, and the fluid does not fill the chamber, so that the roller has a damping effect, which can effectively suppress the spread of the vibration of the tunnel fan 1. In addition, when the tunnel fan 1 is started or shut down, the rapid change of the motor frequency may cause the entire unit to vibrate. The multiple rollers can act as multiple tiny damping units to effectively reduce the vibration phenomenon generated by the tunnel fan 1 during the startup or shutdown period).

[0030] In addition, a plurality of guide blades 6 are circumferentially arranged on the inner wall of the rotating ring 7 connected to the rotation of each roller. One side of the guide blade 6 is fixed to the inner wall of the rotating ring 7. The guide blade 6 is tilted relative to the axis of the rotating ring 7. The tilt angle is between 5 degrees and 15 degrees, and the tilt direction of the plurality of guide blades 6 is in the same rotation direction of the rotating ring 7. When the fluid in the tunnel fan 1 passes through the rotating inner ring, the large contact area between the fluid and the plurality of guide blades 6 can effectively reduce the vibration of the tunnel fan 1, and the fluid passing through the rotating inner ring can be passively rotated. When the air pressure inside the tunnel is not stable (for example, the tunnel wind pressure changes), the rotating rotating inner ring can effectively stabilize the influence of the changing wind pressure on the impeller of the tunnel fan 1 (for example, preventing the increase of the impeller push resistance, the backflow of the tunnel fan 1 fluid, etc.), thereby effectively preventing the vibration of the tunnel fan 1.

[0031] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A tunnel fan anti-surge diffuser, comprising a fixed ring (4), a roller, a rotating ring (7) and a guide vane (6), characterized in that: The rotating circle (7) is arranged inside the circumference of the fixed circle (4), a plurality of rollers are arranged on the circumference between the rotating circle (7) and the fixed circle (4), a plurality of guide blades (6) are evenly fixed on the inner circumference of the rotating circle (7), and the rotating circle (7) can rotate relative to the fixed circle (4); The roller comprises a roller (8) and two corresponding pins (5), wherein the roller (8) is a tubular cylinder, the two pins (5) are coaxially sleeved in the roller (8) from both sides of the cylinder mouth of the roller (8), a cavity is provided on one side of the pin (5), and the cavities of the two pins (5) are arranged opposite to each other; The two pin shafts (5) inside the roller are connected to form a chamber, and a fluid is arranged in the chamber.

2. The tunnel fan anti-surge diffuser according to claim 1, characterized in that: One side of the guide blade (6) is connected to the inner wall of the rotating circle (7), and the guide blade (6) is arranged to be inclined relative to the axis of the rotating circle (7).

3. The tunnel fan anti-surge diffuser according to claim 1, characterized in that: The pins (5) at both ends of the roller axis extend respectively along the axis direction and extend beyond both ends of the roller (8) axis to form mounting portions.

4. The tunnel fan anti-surge diffuser according to claim 1, characterized in that: A plurality of mounting grooves are provided on the inner side of the rotating ring (7) along the circumference of the axis direction, and the plurality of rollers are rotatably connected in the mounting grooves in a one-to-one correspondence through the mounting parts.

5. The tunnel fan anti-surge diffuser according to claim 1, characterized in that: An annular groove (9) is provided on the inner side of the rotating ring (7), and the shaft section of the roller (8) of the roller is correspondingly provided in the shaft section of the annular groove (9).

6. The tunnel fan anti-surge diffuser according to claim 1, characterized in that: The anti-surge diffuser of the tunnel fan (1) is coaxially fixed in the wind tube of the tunnel fan (1).

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