A stable double-suction centrifugal fan

Abstract

This invention provides a stable double-suction centrifugal fan, comprising a square bracket installed on each of the two air inlets of the fan. The two square brackets face each other and are fixed to the fan's volute. The fan is supported by these two square brackets, and each of the two air inlets is provided with a docking structure. In this invention, the fan is supported by two square brackets, which improves the fan's stability and ease of manufacturing. The docking structures at the fan inlets facilitate the alignment and connection of the fan with the exhaust duct of the equipment to be vented, ensuring airflow stability, reducing vibration and noise, and improving the fan's installation and operational stability.

Description

Technical Field

[0001] This utility model belongs to the field of fan manufacturing, and in particular relates to a stable double-suction centrifugal fan. Background Technology

[0002] Double-suction centrifugal fans are widely used in industry, agriculture, transportation, homes and public buildings as gas delivery equipment for ventilation, air circulation, exhaust and cooling. The fan is mainly composed of blades, motor and volute.

[0003] Currently, most double-suction centrifugal fans are installed on a fan base. To improve the fan's operational stability, the fan base must be large enough and have a certain weight. Furthermore, the fan's installation position must be repeatedly adjusted during installation to ensure that the fan's center of gravity and the base's center of gravity are on the same vertical line. This structure makes fan installation inconvenient. Additionally, in existing fan structures, the air inlet of the fan lacks a proper alignment with the outlet of the exhaust duct of the equipment being exhausted. During installation, the air inlet of the fan and the outlet of the equipment cannot be properly aligned, causing vibration during airflow and leading to unstable fan operation. Thirdly, to prevent air leakage during exhaust, a sealing gasket is installed between the fan's air inlet duct and the equipment being exhausted. These gaskets are typically made of rubber, deforming under pressure to achieve a seal. However, the installation of the sealing gasket results in a non-rigid connection between the fan and the equipment. Changes in airflow cause relative movement between the fan and the equipment, generating vibration that affects the fan's operational stability. Simultaneously, the vibration leads to noise pollution, causing discomfort to the operator. Utility Model Content

[0004] In view of this, the present invention aims to provide a stable double-suction centrifugal fan to facilitate fan installation and improve the stability of fan installation and operation.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A stable double-suction centrifugal fan includes a square bracket installed on each of the two air inlets of the double-suction centrifugal fan. The two square brackets face each other and are fixed to the volute of the fan. The fan is supported by the two square brackets, and the two air inlets of the fan are respectively provided with docking structures.

[0007] Furthermore, the square bracket is a square frame structure consisting of four side frames and a flat outer surface. The four side frames are L-shaped steel or channel steel.

[0008] Furthermore, the docking structure includes an air inlet pipe at the air inlet, and the outer circumferential surface of the air inlet pipe at the outer port is a conical structure;

[0009] The air inlet pipe has a flange near the port for connecting to the air outlet equipment. The flange has several flange holes, which are fitted with bolts. The air inlet pipe is fitted with a sealing gasket, which is located on the outward side of the flange.

[0010] Furthermore, the sealing gasket is located within the bolt enclosure area, and a sleeve is fitted onto the outward-facing end of each bolt, the length of which is less than the thickness of the sealing gasket.

[0011] Furthermore, a sealing groove is provided on the outer side of the flange corresponding to the sealing gasket, and the sealing gasket is embedded in the sealing groove.

[0012] Compared with the prior art, the stable double-suction centrifugal fan of this utility model has the following advantages:

[0013] (1) The present invention has a simple structure. The fan is supported by two square brackets, which improves the stability of the fan support and the convenience of production and manufacturing.

[0014] (2) In this utility model, the setting of the docking structure at the air inlet of the fan facilitates the alignment and connection of the exhaust pipe of the fan and the exhaust equipment to be exhausted, ensuring the stability of airflow and reducing vibration and noise. The setting of the bolt sleeve enables the fan to be rigidly connected to the corresponding exhaust equipment, improving the installation and operation stability of the fan. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0016] Figure 1 This is a front view of a stable double-suction centrifugal fan according to an embodiment of the present invention;

[0017] Figure 2 This is a left view of a stable double-suction centrifugal fan according to an embodiment of the present invention;

[0018] Figure 3 for Figure 2 Enlarged view of A in the image.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1-Square bracket; 2-Vortex; 4-Blade; 6-Inlet pipe; 61-Conical structure; 7-Flange; 8-Bolt; 9-Sleeve; 10-Sealing gasket; 11-Inlet. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 , Figure 2 As shown, a stable double-suction centrifugal fan includes a volute 2 and rotating blades 4 inside. The volute 2 has an air inlet 11 on its left and right sides, which connects to the exhaust pipe of the equipment to be vented. A directional support 1 is installed on each side of the two air inlets 11 on the volute 2. Each of the two square supports 1 is a rectangular frame structure formed by four sides, which are L-shaped steel or channel steel. The four outer sides of the frame are planar, and the bottom side has mounting holes (not shown in the figure). The two square supports 1 face each other and are fixed to the volute 2, such as by welding or screws. The fan is supported by these two square supports 1. The square supports 1 are simple to manufacture. The fan is positioned between the two square supports and connected and fixed to the two directional supports 1. The overall structure is simple, improving the ease of fan installation while providing stable support for the fan.

[0023] To ensure that the air inlet of the fan is aligned with the air outlet of the exhaust pipe of the equipment to be ventilated, the volute 2 is equipped with air inlet pipes 6 at its two air inlets 11. The air inlet pipes 6 are installed on the volute 2, as follows: Figure 2 and Figure 3 As shown, the outer circumferential surface of the outward-facing port (the port of the air inlet pipe away from the air inlet) of the air inlet pipe 6 is a conical structure 61. The conical structure 61 matches the conical port (the inner surface of the port is conical) of the air outlet of the exhaust pipe of the equipment to be exhausted, forming an insertion interface structure. After the conical structure 61 is inserted into the air outlet of the exhaust pipe, the air inlet of the fan and the air outlet of the equipment to be exhausted can be aligned, and the airflow from the equipment to be exhausted can smoothly enter the fan, preventing vibration and noise, and improving the smoothness of fan operation. A flange 7 is provided near its outward-facing port of the air inlet pipe 6. The flange 7 has several flange holes, each of which is matched with a bolt 8. A sealing gasket 10 is fitted on the air inlet pipe 6, and the sealing gasket 10 is located on the outward-facing side of the flange 7. The setting of the sealing gasket 10 achieves a sealed connection between the air inlet pipe 6 and the air outlet of the equipment to be exhausted, preventing air leakage and improving the safety of gas exhaust.

[0024] Preferably, a sealing groove is formed on the outer side of the flange 7 corresponding to the sealing gasket 10. The sealing gasket 10 is located within the area enclosed by the bolts 8, and is embedded in the sealing groove. A sleeve 9 is fitted onto the outward-facing end of each bolt 8. The sleeve 9 is a metal sleeve, and its length is less than the thickness of the sealing gasket 10. That is, the outer end face of the sleeve 9 is outside the outer end face of the sealing gasket 10. When the flange 7 is connected to the flange of the exhaust duct of the ventilation equipment, the two flanges first press tightly against the sealing gasket 10 to achieve a seal. The two flanges then compress the sealing gasket 10 until they are tightly pressed against the sleeve 9, and then the bolts 8 are used to connect the two flanges. The sleeve 9 provides a rigid connection between the two flanges, improves the stability of the fan operation, prevents vibration and noise, and ensures stable fan installation.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A support-stable double-suction centrifugal fan, characterized by: The fan includes a square bracket installed on each side of the two air inlets (11) of the double-suction centrifugal fan. The two square brackets (1) face each other and are fixed to the volute (2) of the fan. The fan is supported by the two square brackets (1). The two air inlets (11) of the fan are respectively provided with docking structures.

2. A support-stabilized double-suction centrifugal fan according to claim 1, characterized in that: The square bracket (1) is a square frame structure consisting of four side frames and a flat outer surface. The four side frames are L-shaped steel or channel steel.

3. A stable double-suction centrifugal fan according to claim 1, characterized in that: The docking structure includes an air inlet pipe (6) provided at the air inlet (11), and the outer circumferential surface of the air inlet pipe (6) at the outward port is a conical structure (61); The air inlet pipe (6) has a flange (7) for connecting to the air outlet equipment near its outward end. The flange (7) has several flange holes, and bolts (8) are matched to the flange holes. The air inlet pipe (6) is fitted with a sealing gasket (10), which is located on the outward side of the flange (7).

4. A support-stabilized double-entry centrifugal fan according to claim 3, characterized in that: The sealing gasket (10) is located within the area enclosed by the bolts (8), and a sleeve (9) is fitted on the outward end of each bolt (8), the length of which is less than the thickness of the sealing gasket (10).

5. A support-stabilized double-entry centrifugal fan according to claim 4, characterized in that: A sealing groove is provided on the outer side of the flange (7) corresponding to the sealing gasket (10), and the sealing gasket (10) is embedded in the sealing groove.

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