Double-suction type multi-blade centrifugal fan with filtering function

Abstract

The utility model belongs to the technical field of centrifugal fans, and particularly relates to a double-suction type multi-blade centrifugal fan with a filtering function, which comprises a shell and an exhaust pipe which are integrally formed, symmetrical air inlets are arranged on two sides of the shell, fixing frames are mounted at the air inlets, a fan motor is mounted between the two fixing frames, and the fan motor is connected with the exhaust pipe. An impeller is fixed to the outer side wall of the fan motor, and a clamping groove is formed in the surface of each fixing frame. When the air purifier works, air enters the shell from the two sides of the shell, enough air volume can be provided, the filter screens are arranged at the two air inlets, the filter screens are firmly installed and fixed through the positioning frames, external sundries are prevented from entering the shell, the three filter screens form the circular filter screen and cover the air inlets, each filter screen can be independently installed and detached, and the air purifier is convenient to use. When a certain filter screen is damaged, the corresponding filter screen can be replaced, the maintenance cost is saved, the filter screen is easy to clean after being detached, and the filter screen is simple in structure and convenient to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of centrifugal fans, and particularly relates to a double-suction multi-blade centrifugal fan with a filter. Background Technique

[0002] A centrifugal fan is a ventilation, air change or air supply device. Its working principle is to accelerate the gas by using a high-speed rotating impeller, and then convert the kinetic energy into potential energy (pressure) by decelerating and changing the flow direction. Centrifugal fans are not only widely used in industrial and civil buildings in the fields of air conditioning, environmental protection, refrigeration, heating, drying, etc., but also have important applications in the fields of transportation, mining, metallurgy, energy, etc. A corresponding filtering mechanism needs to be designed at the air inlet of the centrifugal fan to prevent foreign objects from entering the centrifugal fan and damaging the impeller.

[0003] It is found that the publication (announcement) number: CN218624785 discloses a filtered centrifugal fan, and the following technical solutions are disclosed in this technology: "including a centrifugal fan body, a frame is installed at the bottom end of the centrifugal fan body, an air inlet is opened at the center of the front of the centrifugal fan body, plug-in seats are installed on both sides of the air inlet on the front of the centrifugal fan body, magnets are embedded at both the upper and lower ends of the front of the air inlet, and an air inlet filter screen plate is arranged on the front of the air inlet", etc.; it has technical effects such as "multi-stage filtering that is convenient for air inlet and outlet to ensure dust-free air supply, and at the same time, a filtering structure that is convenient for quick disassembly and cleaning, which is convenient for ensuring the ventilation volume, and has high stability and practicality, and has certain popularization value".

[0004] For a centrifugal fan with double-sided suction, filtering devices need to be provided on both sides. The existing filtering devices are relatively inconvenient to install and disassemble, and it is not convenient to clean and maintain the filtering devices during subsequent use.

[0005] To solve the above problems, a double-suction multi-blade centrifugal fan with a filter is proposed in this application. Content of the Utility Model

[0006] To solve the problems raised in the above background technique. The utility model provides a double-suction multi-blade centrifugal fan with a filter, which has the characteristics of being convenient for installation and disassembly, partially replaceable, easy to clean, and reducing the maintenance cost.

[0007] To achieve the above object, the present utility model provides the following technical solution: A double-suction multi-blade centrifugal fan with filtration, including an integrally formed housing and an exhaust pipe. Symmetric air inlets are provided on both sides of the housing, and a fixing frame is installed at the air inlet. A fan motor is installed between the two fixing frames. An impeller is fixed to the outer sidewall of the fan motor. A second card slot is formed on the surface of each fixing frame. Three positioning frames are arranged on the surface of the fixing frame. A second claw is formed at the position corresponding to the second card slot on each positioning frame. The positioning frame and the fixing frame are engaged by the second claw. The positioning frame is a fan-shaped structure with a hollow interior. The three positioning frames form a circle. A first claw is fixedly connected to the edge of the positioning frame. A first card slot is formed on the surface of the housing corresponding to the first claw. The first claw and the first card slot are engaged. A filter screen is fixed inside the positioning frame.

[0008] Preferably, for a double-suction multi-blade centrifugal fan with filtration of the present utility model, the filter screen is adapted to the cavity of the positioning frame. A positioning plate is fixed to the side of the filter screen away from the arc edge. A positioning slot is formed on the surface of the positioning plate. A matching positioning block is formed on the inner sidewall of the positioning frame.

[0009] Preferably, for a double-suction multi-blade centrifugal fan with filtration of the present utility model, three mounting holes are provided on both sides of the surface of the housing. The fixing frame is installed at the mounting holes by bolts.

[0010] Preferably, for a double-suction multi-blade centrifugal fan with filtration of the present utility model, the positioning frame is made of PC material, and the edge of the positioning frame is fixed to the filter screen by hot pressing.

[0011] Preferably, for a double-suction multi-blade centrifugal fan with filtration of the present utility model, the first claw is a rod with an L-shaped longitudinal section, and the exposed part of the first claw outside the positioning frame is flat.

[0012] Preferably, for a double-suction multi-blade centrifugal fan with filtration of the present utility model, the fixing frame is a Y-shaped rod structure, and a triangular tabletop is formed in the middle of the fixing frame. The center of the positioning frame abuts against this tabletop.

[0013] Preferably, for a double-suction multi-blade centrifugal fan with filtration of the present utility model, the filter screen is a 18*14mesh mesh structure made of nickel-chromium alloy.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] When the utility model is in operation, air enters the housing from both sides of the housing, which can provide sufficient air volume. Filters are provided at both air inlets. The filters are firmly installed and fixed through positioning frames to prevent foreign objects from entering the housing. The three filters form a circular filter that covers the air inlets. Each filter can be individually installed and disassembled. When a certain filter is damaged, only the corresponding filter needs to be replaced, which saves maintenance costs. After the filters are disassembled, they are easy to clean. The utility model has a simple structure and is convenient to use. Description of the Drawings

[0016] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is a schematic structural diagram of the housing and the fixing frame in the present utility model;

[0019] Figure 3 is a schematic structural diagram of the fan motor and the impeller in the present utility model;

[0020] Figure 4 is a schematic structural diagram of the positioning frame and the filter in the present utility model;

[0021] Figure 5 is a schematic structural diagram of the first claw and the second claw in the present utility model;

[0022] Figure 6 is a schematic structural diagram of the filter and the positioning plate in the present utility model;

[0023] In the figure: 1. Housing; 11. Mounting hole; 12. First card slot; 2. Exhaust duct; 3. Fixing frame; 31. Second card slot; 4. Fan motor; 5. Impeller; 6. Positioning frame; 61. Second claw; 62. First claw; 7. Filter; 71. Positioning plate. Detailed Embodiments

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] Embodiment 1

[0026] As Figures 1 to 6 shown;

[0027] A double-suction multi-vane centrifugal fan with filtration, comprising an integrally formed housing 1 and an exhaust duct 2. Symmetrical air inlets are provided on both sides of the housing 1. A fixing frame 3 is installed at the air inlet. A fan motor 4 is installed between the two fixing frames 3. An impeller 5 is fixed to the outer side wall of the fan motor 4. A second card slot 31 is formed on the surface of each fixing frame 3. Three positioning frames 6 are arranged on the surface of the fixing frame 3. A second clamping claw 61 is formed at the position corresponding to the second card slot 31 on each positioning frame 6. The positioning frame 6 and the fixing frame 3 are clamped by the second clamping claw 61. The positioning frame 6 is a fan-shaped structure with a hollow interior. The three positioning frames 6 form a circle. A first clamping claw 62 is fixedly connected to the edge of the positioning frame 6. A first card slot 12 is formed on the surface of the housing 1 corresponding to the first clamping claw 62. The first clamping claw 62 and the first card slot 12 are clamped together. A filter screen 7 is fixed inside the positioning frame 6;

[0028] In this embodiment: When the present utility model performs a blowing operation, the fan motor 4 is started. The stator of the fan motor 4 is fixed to the center of the fixing frame 3, and the rotor drives the impeller 5 to rotate, so that the outside air enters the housing 1 through the air inlets on both sides and then is discharged through the air outlet, completing the blowing operation. The filter screen 7 in the present utility model filters the incoming air to prevent sundries such as sand and gravel in the air from entering the housing 1 and damaging the impeller 5, thereby protecting the present utility model. The filter screen 7 in the present utility model is installed on the surfaces of the housing 1 and the fixing frame 3 through the positioning frame 6. When installing the positioning frame 6, first insert the second clamping claws 61 on both sides of the positioning frame 6 into the second card slot 31. At this time, the first clamping claw 62 and the first card slot 12 correspond to each other. Pull the top of the first clamping claw 62 to one side so that the bottom of the first clamping claw 62 is inclined and inserted into the first card slot 12. After releasing the hand, the installation and fixation of the positioning frame 6 are completed. The three positioning frames 6 form a circle and can cover the entire air inlet. When disassembling the positioning frame 6, first pull the top of the first clamping claw 62 to make its bottom inclined, then pull out the first clamping claw 62, and then lift the entire positioning frame 6 upward to remove the entire positioning frame 6. The installation and disassembly are simple and convenient. Since both the two sides and the edge of the positioning frame 6 are clamped in the card slot, when performing the filtering operation, the wind applies a force to the positioning frame 6. Since this force is opposite to the force for removing the positioning frame 6, the positioning frame 6 is stably and firmly installed during the operation and will not suddenly fall off. Since the filter screen 7 is fixed in the positioning frame 6, it is also stably and firmly installed during the operation.

[0029] Furthermore:

[0030] In an alternative embodiment, the filter screen 7 is adapted to the cavity of the positioning frame 6. A positioning plate 71 is fixed to the side of the filter screen 7 away from the arc edge. A positioning groove is formed on the surface of the positioning plate 71. A matching positioning block is formed on the inner side wall of the positioning frame 6.

[0031] In this embodiment: Through this design, when the positioning frame 6 and the filter screen 7 in the present utility model are combined, the filter screen 7 is pre-fixed firmly in the positioning frame 6 through the positioning blocks on the positioning frame 6 and the positioning grooves on the positioning plate 71, facilitating the processing of the edge of the filter screen 7.

[0032] Furthermore:

[0033] In an alternative embodiment, three mounting holes 11 are provided on both sides of the surface of the housing 1, and the fixing frame 3 is installed at the mounting holes 11 through bolts.

[0034] In this embodiment: Through this design, the fixing frame 3 is installed at the mounting holes 11 and is firmly connected to the housing 1, improving the reliability of the present utility model.

[0035] Furthermore:

[0036] In an alternative embodiment, the positioning frame 6 is made of PC material, and the edge of the positioning frame 6 is fixed to the filter screen 7 by hot pressing.

[0037] In this embodiment: By means of hot pressing, the edges of the positioning frame 6 and the filter screen 7 are firmly combined. The PC material has good plasticity and corrosion resistance, has a long service life, and has a low cost, facilitating processing and manufacturing.

[0038] Furthermore:

[0039] In an alternative embodiment, the first claw 62 is a rod with an L-shaped longitudinal section, and the exposed part of the first claw 62 outside the positioning frame 6 is flat.

[0040] In this embodiment: Through this design, the first claw 62 and the first slot 12 are firmly engaged, preventing detachment during operation. Moreover, the flat top of the first claw 62 facilitates the user to pull the first claw 62, facilitating the installation and disassembly of the positioning frame 6.

[0041] Furthermore:

[0042] In an alternative embodiment, the fixing frame 3 is a Y-shaped rod structure, and a triangular tabletop is formed in the middle of the fixing frame 3, and the center of the positioning frame 6 abuts against this tabletop.

[0043] In this embodiment: Through this design, the tabletop of the fixing frame 3 plays a supporting role for the positioning frame 6, preventing the positioning frame 6 from moving due to wind force, and enabling the positioning frame 6 to be stably installed on the fixing frame 3 during operation.

[0044] Furthermore:

[0045] In an alternative embodiment, the filter screen 7 is a 18*14mesh mesh structure made of nickel-chromium alloy.

[0046] In this embodiment: Through this design, the filter screen 7 with 18*14mesh can prevent foreign objects from entering the housing 1 and will not cause great resistance to the air entering the housing 1.

[0047] The working principle and usage process of the present utility model: When the present utility model performs air supply operation, the fan motor 4 is started. The stator of the fan motor 4 is fixedly centered on the fixed frame 3, and the rotor drives the impeller 5 to rotate, enabling the outside air to enter the housing 1 through the air inlets on both sides, and then discharged through the air outlet, completing the air supply operation. The filter screen 7 in the present utility model filters the incoming air to prevent foreign objects such as sand and gravel in the air from entering the housing 1 and damaging the impeller 5, thereby protecting the present utility model. The filter screen 7 in the present utility model is installed on the surfaces of the housing 1 and the fixed frame 3 through the positioning frame 6. When installing the positioning frame 6, first insert the second claws 61 on both sides of the positioning frame 6 into the second card slots 31. At this time, the first claws 62 and the first card slots 12 correspond to each other. Press the top of the first claw 62 to one side so that the bottom of the first claw 62 is inclined and inserted into the first card slot 12. After releasing the hand, the installation and fixation of the positioning frame 6 are completed. The three positioning frames 6 form a circle and can cover the entire air inlet. When disassembling the positioning frame 6, first press the top of the first claw 62 to make its bottom inclined, then pull out the first claw 62, and then lift the entire positioning frame 6 upward to remove the entire positioning frame 6. The installation and disassembly are simple and convenient. Since both sides and the edges of the positioning frame 6 are engaged in the card slots, during the filtering operation, the wind applies a force to the positioning frame 6. Since this force is opposite to the force for removing the positioning frame 6, the positioning frame 6 is stably and firmly installed during operation and will not suddenly fall off. Since the filter screen 7 is fixed in the positioning frame 6, it is also stable and firm during operation. The table surface of the fixed frame 3 supports the positioning frame 6 to prevent the wind from moving the positioning frame 6 and enables the positioning frame 6 to be stably installed on the fixed frame 3 during operation. When the positioning frame 6 and the filter screen 7 in the present utility model are combined, through the positioning blocks on the positioning frame 6 and the positioning slots on the positioning plate 71, the filter screen 7 is pre-fixed firmly in the positioning frame 6 during combination, facilitating the processing of the edge of the filter screen 7. Through the hot pressing method, the edges of the positioning frame 6 and the filter screen 7 are firmly combined. The pc material has good plasticity and corrosion resistance, has a long service life, and has a low cost, facilitating processing and manufacturing. The filter screen 7 with 18*14mesh can prevent foreign objects from entering the housing 1 and will not cause great resistance to the air entering the housing 1.

[0048] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A double-suction multi-blade centrifugal fan with filtration, comprising an integrally formed housing (1) and an exhaust pipe (2), characterized in that: Symmetrical air inlets are provided on both sides of the housing (1), and a fixing frame (3) is installed at the air inlet. A fan motor (4) is installed between the two fixing frames (3). An impeller (5) is fixed to the outer wall of the fan motor (4). A second slot (31) is provided on the surface of each fixing frame (3). Three positioning frames (6) are provided on the surface of the fixing frame (3). A second claw (61) is formed at a position of each positioning frame (6) corresponding to the second slot (31). The positioning frame (6) and the fixing frame (3) are engaged with each other through the second claw (61). The positioning frame (6) is a hollow fan-shaped structure. The three positioning frames (6) form a circle. The edge of the positioning frame (6) is fixedly connected with a first claw (62). A first slot (12) is provided on the surface of the housing (1) corresponding to the first claw (62). The first claw (62) is engaged with the first slot (12). A filter (7) is fixed inside the positioning frame (6).

2. The double-suction multi-blade centrifugal fan with filtration according to claim 1, characterized in that: The filter screen (7) and the cavity of the positioning frame (6) are adapted to each other; a positioning plate (71) is fixed to the side of the filter screen (7) away from the arc edge; a positioning groove is provided on the surface of the positioning plate (71); and a matching positioning block is formed on the inner side wall of the positioning frame (6).

3. The double-suction multi-blade centrifugal fan with filtration according to claim 1, characterized in that: Three mounting holes (11) are provided on both sides of the surface of the housing (1), and the fixing frame (3) is mounted on the mounting holes (11) by means of bolts.

4. The double-suction multi-blade centrifugal fan with filtration according to claim 1, characterized in that: The positioning frame (6) is made of PC material, and the edge of the positioning frame (6) is fixed to the filter screen (7) by heat pressing.

5. The double-suction multi-blade centrifugal fan with filtration according to claim 1, characterized in that: The first clamping claw (62) is a rod with an L-shaped longitudinal section, and the exposed portion of the first clamping claw (62) located outside the positioning frame (6) is flat.

6. The double-suction multi-blade centrifugal fan with filtration according to claim 1, characterized in that: The fixing frame (3) is a Y-shaped rod structure, and a triangular table top is formed in the middle of the fixing frame (3), and the center of the positioning frame (6) abuts against the table top.

7. The double-suction multi-blade centrifugal fan with filtration according to claim 1, characterized in that: The filter screen (7) is a 18*14 mesh structure made of nickel-chromium alloy.

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