Air inlet structure of fan

Abstract

The utility model provides an air inlet structure of a fan, and belongs to the technical field of machinery. The problem that an existing fan is poor in air inlet efficiency is solved. The fan air inlet structure comprises a volute and an air guide barrel arranged on the front side of the volute, an air inlet pipe coaxial with the air guide barrel is formed on the front side face of the volute, a rear flange and a front flange are formed on the outer wall of the front end of the air inlet pipe and the outer wall of the rear end of the air guide barrel respectively, an annular rubber pad is clamped between the front flange and the rear flange, and the thickness of the rubber pad ranges from 1 cm to 2.5 cm; a circle of internal threaded pipes are further vertically fixed to the front side face of the volute, bolts are arranged in all the holes of the front flange, the internal threaded pipes and the bolts are the same in number and correspond to each other in position, rod portions of the bolts sequentially penetrate through the rubber pads and the corresponding holes in the rear flange and are screwed into the corresponding internal threaded pipes, and head portions of the bolts are tightly pressed on the front end face of the front flange. The fan air inlet structure is high in air inlet efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery, and relates to a fan, in particular to an air inlet structure of a fan. Background Technique

[0002] A centrifugal fan is a machine that, based on the principle of converting kinetic energy into potential energy, uses a high-speed rotating impeller to accelerate gas, then decelerates and changes the flow direction to convert kinetic energy into potential energy (pressure).

[0003] An existing centrifugal fan, such as a centrifugal fan with a replaceable air inlet pipe disclosed in the Chinese Patent Database (application number: 201920950060.8), includes a centrifugal fan. One side of the centrifugal fan is fixedly installed with an air inlet pipe. The air inlet pipe includes a main pipe and a secondary pipe. The main pipe and the secondary pipe are movably installed, and the main pipe is fixedly installed with the centrifugal fan. The end of the main pipe away from the centrifugal fan is provided with a plurality of slots. The slots are movably inserted with insertion rods provided on the secondary pipe. The top surface of the end of the main pipe away from the centrifugal fan is fixedly provided with an arc-shaped plate. The top surface of the end of the arc-shaped plate away from the main pipe is fixedly provided with a sleeve. A lifting plate is slidably clamped in the sleeve. The top surface of the lifting plate is fixedly provided with a round rod. The outer wall of the round rod is movably sleeved with a spring. The two ends of the spring are respectively fixedly connected with the inner top surface of the sleeve and the top surface of the lifting plate. One end of a positioning rod is fixedly connected to the bottom surface of the lifting plate. The other end of the positioning rod passes through the bottom of the sleeve and is movably inserted into a positioning hole provided on the secondary pipe through an opening on the arc-shaped plate.

[0004] In the above-mentioned centrifugal fan, the air inlet pipe has a certain length, and the end of the air inlet pipe away from the centrifugal fan is in a suspended state. Since the operation of the centrifugal fan will generate a certain vibration, the vibration transmitted to the air inlet pipe will cause the end of the air inlet pipe away from the centrifugal fan to vibrate more significantly, affecting the air inlet efficiency. Content of the Utility Model

[0005] The purpose of the utility model is to propose an air inlet structure of a fan that can improve the air inlet efficiency in view of the above problems existing in the prior art.

[0006] The object of the present utility model can be achieved by the following technical solutions: A fan air inlet structure includes a volute and a wind guide cylinder arranged on the front side of the volute. An air inlet pipe coaxial with the wind guide cylinder is formed on the front side surface of the volute. It is characterized in that a rear flange and a front flange are respectively formed on the outer wall of the front end of the air inlet pipe and the outer wall of the rear end of the wind guide cylinder. Both the front flange and the rear flange are annular, and an annular rubber pad is clamped between them. The axis of the rubber pad is parallel to that of the wind guide cylinder, and the thickness of the rubber pad is 1 cm to 2.5 cm. A circle of internal threaded pipes is also vertically fixed on the front side surface of the volute, and the circle of internal threaded pipes is evenly distributed around the central axis of the air inlet pipe. A bolt is provided in each hole of the front flange. The number of the internal threaded pipes and the bolts is the same and their positions correspond one by one. The bolt rod sequentially passes through the rubber pad, the corresponding hole on the rear flange and is screwed into the corresponding internal threaded pipe, and the bolt head presses tightly on the front end surface of the front flange.

[0007] A relatively thick rubber pad is clamped between the rear flange of the air inlet pipe and the front flange of the wind guide cylinder, which not only forms a reliable seal between the front flange and the rear flange to ensure that the gas is completely drawn into the volute, but also makes the air inlet pipe and the wind guide cylinder in indirect contact, and uses the rubber pad to buffer the vibration transmitted from the volute, thereby effectively reducing the vibration at the wind guide cylinder, enabling the gas to enter smoothly and enhancing the air inlet efficiency.

[0008] In the above-mentioned fan air inlet structure, a circle of springs is further provided between the rear flange and the volute, and both ends of the spring act on the front side surface of the volute and the rear end surface of the rear flange respectively. The springs are provided to elastically support the rear flange, which not only positions the wind guide cylinder more stably, but also can further reduce the vibration transmission and make the air inlet efficiency better.

[0009] In the above-mentioned fan air inlet structure, the number of the springs is the same as that of the internal threaded pipes and their positions correspond one by one. The rear end of the spring is sleeved on the corresponding internal threaded pipe. The internal threaded pipe plays a role in guiding the telescopic movement of the spring to make the spring operate stably.

[0010] In the above-mentioned fan air inlet structure, a ring-shaped crush groove is formed on the rear end surface of the rubber pad, and the crush groove is coaxial with the rubber pad. The crush groove is provided to make the rear side of the rubber pad more easily deformed to buffer the vibration faster and better, so as to more stably achieve the purpose of improving the air inlet efficiency.

[0011] In the above-mentioned fan air inlet structure, there are two crush grooves and they are coaxially arranged, and the above-mentioned bolts are located between the two crush grooves.

[0012] In the above-mentioned fan air inlet structure, the axial section of the crush groove is arc-shaped to ensure the strength of the rear side of the rubber pad.

[0013] In the above-mentioned fan air inlet structure, the internal threaded pipe is fixedly connected to the volute by welding.

[0014] In the above-mentioned air inlet structure of the fan, the air guide cylinder is made of plastic material, making it lighter and enabling it to be more stably positioned.

[0015] Compared with the prior art, the air inlet structure of this fan has the following advantages:

[0016] 1. A relatively thick rubber pad is clamped between the rear flange of the air inlet pipe and the front flange of the air guide cylinder, not only forming a reliable seal between the front flange and the rear flange to ensure that the gas is completely drawn into the volute, but also making the air inlet pipe and the air guide cylinder in indirect contact, and using the rubber pad to buffer the vibration transmitted from the volute, thereby effectively reducing the vibration at the air guide cylinder, enabling the gas to enter smoothly and enhancing the air inlet efficiency.

[0017] 2. Springs are provided to elastically support the rear flange, not only positioning the air guide cylinder more stably, but also further reducing the vibration transmission and making the air inlet efficiency better. Description of the Drawings

[0018] Figure 1 is a three-dimensional schematic diagram of the fan.

[0019] Figure 2 is a sectional schematic diagram of the fan.

[0020] Figure 3 is Figure 2 an enlarged schematic diagram of part A in

[0021] In the figure, 1. Volute; 1a. Air inlet pipe; 1b. Rear flange; 2. Air guide cylinder; 2a. Front flange; 3. Rubber pad; 3a. Crush groove; 4. Internal thread pipe; 5. Bolt; 6. Spring. Detailed Embodiment

[0022] The following are specific embodiments of the present invention and in combination with the drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0023] As Figure 1 shown, the air inlet structure of this fan includes a volute 1 and an air guide cylinder 2 provided on the front side of the volute 1. Among them, an air inlet pipe 1a is formed on the front side surface of the volute 1, and the air inlet pipe 1a and the air guide cylinder 2 are coaxially arranged. In actual products, the volute 1 and the air inlet pipe 1a are of an integral structure.

[0024] Specifically,

[0025] As Figure 2 and Figure 3 shown, a rear flange 1b and a front flange 2a are respectively formed on the outer wall of the front end of the air inlet pipe 1a and the outer wall of the rear end of the air guide cylinder 2, and both the front flange 2a and the rear flange 1b are annular. In actual products, the air inlet pipe 1a and the rear flange 1b are of an integral structure, and the front flange 2a and the air guide cylinder 2 are of an integral structure. AsFigure 1 As shown, an annular rubber pad 3 is clamped between the front flange 2a and the rear flange 1b. That is, at this time, the front and rear end faces of the rubber pad 3 are respectively in close contact with the rear end face of the front flange 2a and the front end face of the rear flange 1b. The axes of the rubber pad 3 and the air guide cylinder 2 are parallel, and preferably, the two are coaxially arranged. The thickness of the rubber pad 3 is 1 cm to 2.5 cm, so that the rubber pad 3 can exhibit better vibration damping performance. Preferably, the thickness of the rubber pad 3 is 2 cm.

[0026] As Figure 2 As shown, a circle of internally threaded pipes 4 is vertically fixed on the front side of the volute 1, and the circle of internally threaded pipes 4 is evenly distributed around the central axis of the air inlet pipe 1a. A bolt 5 is provided in each hole of the front flange 2a. The number of the internally threaded pipes 4 and the bolts 5 is the same and their positions correspond one by one. The rod part of the bolt 5 sequentially passes through the rubber pad 3, the corresponding hole on the rear flange 1b and is screwed into the corresponding internally threaded pipe 4, and the head of the bolt 5 presses tightly on the front end face of the front flange 2a.

[0027] Clamping a relatively thick rubber pad 3 between the rear flange 1b of the air inlet pipe 1a and the front flange 2a of the air guide cylinder 2 not only forms a reliable seal between the front flange 2a and the rear flange 1b to ensure that the gas is completely drawn into the volute 1, but also makes the air inlet pipe 1a and the air guide cylinder 2 in indirect contact, and uses the rubber pad 3 to buffer the vibration transmitted from the volute 1, thereby effectively reducing the vibration at the air guide cylinder 2, enabling the gas to enter smoothly and enhancing the air inlet efficiency.

[0028] Further explanation, a circle of springs 6 is also provided between the rear flange 1b and the volute 1, and the two ends of the spring 6 act on the front side of the volute 1 and the rear end face of the rear flange 1b respectively. By setting the spring 6 to elastically support the rear flange 1b, not only can the air guide cylinder 2 be positioned more stably, but also the vibration transmission can be further reduced, making the air inlet efficiency better. Preferably, the number of the springs 6 and the internally threaded pipes 4 is the same and their positions correspond one by one. The rear end of the spring 6 is sleeved on the corresponding internally threaded pipe 4. The internally threaded pipe 4 plays a role in guiding the telescopic movement of the spring 6 to make the spring 6 operate stably.

[0029] As Figure 3 As shown, a ring-shaped crush groove 3a is formed on the rear end face of the rubber pad 3, and the crush groove 3a is coaxially arranged with the rubber pad 3. By setting the crush groove 3a, the rear side of the rubber pad 3 is more easily deformed to buffer the vibration faster and better, so as to more stably achieve the purpose of improving the air inlet efficiency. Preferably, there are two crush grooves 3a and they are coaxially arranged. At this time, the bolt 5 is located between the two crush grooves 3a; the axial cross-section of the crush groove 3a is arc-shaped to ensure the strength of the rear side of the rubber pad 3.

[0030] In the actual product, the internally threaded pipe 4 and the volute 1 are welded and fixed. The air guide cylinder 2 is made of plastic material, making it lighter and capable of being more stably positioned.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A fan air inlet structure, comprising a volute (1) and an air guide tube (2) arranged on the front side of the volute (1), an air inlet pipe (1a) coaxially arranged with the air guide tube (2) being formed on the front side of the volute (1), characterized in that: A rear flange (1b) and a front flange (2a) are respectively formed on the front end outer wall of the air inlet pipe (1a) and the rear end outer wall of the air guide tube (2); the front flange (2a) and the rear flange (1b) are both annular and a rubber pad (3) is clamped between the two. The axes of the rubber pad (3) and the air guide tube (2) are arranged in parallel, and the thickness of the rubber pad (3) is 1 cm to 2.5 cm. A circle of internal threaded tubes (4) is also vertically fixed on the front side surface of the volute (1), and the circle of internal threaded tubes (4) is evenly distributed around the central axis of the air inlet pipe (1a). Bolts (5) are arranged in each hole of the front flange (2a), and the number of internal threaded tubes (4) and bolts (5) is the same and the positions are one-to-one corresponding. The rod of the bolt (5) passes through the corresponding holes on the rubber pad (3) and the rear flange (1b) in turn and is screwed into the corresponding internal threaded tube (4), and the head of the bolt (5) is pressed tightly against the front end surface of the front flange (2a).

2. The fan air inlet structure according to claim 1, characterized in that: A coil of spring (6) is also provided between the rear flange (1b) and the volute (1), and two ends of the spring (6) act on the front side surface of the volute (1) and the rear end surface of the rear flange (1b) respectively.

3. The fan air inlet structure according to claim 2, characterized in that: The springs (6) and the internally threaded tubes (4) are of the same number and have corresponding positions, and the rear end of the spring (6) is sleeved on the corresponding internally threaded tube (4).

4. The fan air inlet structure according to claim 1, characterized in that: An annular crushing groove (3a) is provided on the rear end surface of the rubber pad (3), and the crushing groove (3a) and the rubber pad (3) are coaxially arranged.

5. The fan air inlet structure according to claim 4, characterized in that: There are two crushing grooves (3a) which are coaxially arranged, and the bolt (5) is located between the two crushing grooves (3a).

6. The fan air inlet structure according to claim 4 or 5, characterized in that: The axial cross section of the crush groove (3a) is in the shape of a circular arc.

7. The fan air inlet structure according to claim 1, characterized in that: The internally threaded pipe (4) and the volute (1) are fixedly connected by welding.

8. The fan air inlet structure according to claim 1, characterized in that: The air guide tube (2) is made of plastic material.

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