Centrifugal fan

Abstract

The utility model relates to a centrifugal fan which comprises a shell, a motor is fixed to the right side of the shell, blades are installed on an output shaft of the motor, a diffuser body is arranged on the right side of an inner cavity of the shell, an installation mechanism is arranged on the right side of the shell, a fixing mechanism is arranged on the left side of the inner cavity of the shell, and two cover plates are arranged on the shell. The mounting mechanism comprises two box bodies fixed to the right side of the shell and two fixing blocks fixed to the right side of the diffuser body, telescopic rods are fixed to the opposite sides of inner cavities of the two box bodies, and the outer surfaces of the telescopic rods are sleeved with first springs. According to the centrifugal fan, through the mounting mechanism, the pull rod is pulled to drive the moving block and the clamping rod to move together and extrude the first spring, the fixed block is inserted into the mounting hole, the pull rod is loosened, the moving block is reset, the clamping rod is clamped into the clamping hole, and the fixed block and the diffuser body are fixed.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan. Background Art

[0002] A centrifugal fan uses the mechanical energy of the rotation of the fan impeller to convert it into pressure energy and kinetic energy of the gas and transport the gas out. The gas enters axially along the streamlined air inlet of the fan, generates air energy through the rotation of the impeller, and radially outputs the gas along the spiral shell and then sends it out from the air outlet of the casing. In a centrifugal fan, the gas enters the impeller axially, changes to radial when passing through the impeller, and then enters the diffuser. In the diffuser, the gas changes its flow direction and the cross-sectional area of ​​the pipe increases, slowing down the airflow. This deceleration effect converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller, and secondly in the diffusion process.

[0003] For example, a Chinese patent (Announcement No.: CN207349133U) discloses a high-speed centrifugal fan, including a casing, an air inlet, blades, an impeller front cover, an impeller rear cover and a motor; the edge of the impeller rear cover intersects with the outer edge of the blade, and an annular diffuser is fixed on the rear side plate of the casing, and the two form a circular groove, and the impeller rear cover is sunk into the circular groove. The speed of the high-speed centrifugal fan of the utility model is ≥10000rpm, and the efficiency of the high-speed centrifugal fan is ≥65%. The utility model fixes the diffuser on the rear side plate of the casing, and the diffuser and the impeller front cover form an impeller outlet diffuser, which can reduce the weight of the impeller, reduce the rotational friction loss of the diffuser and the centrifugal force generated by the high-speed rotation of the impeller, significantly enhance the strength of the impeller, and can meet the requirements of high speed and high pressure. The high-speed centrifugal fan of the utility model has the characteristics of simple processing, low processing cost, low assembly requirements, and good overall strength to meet the requirements of high speed.

[0004] The above-mentioned high-speed centrifugal fan still has certain shortcomings. An annular diffuser is fixed on the rear side plate of the casing, and the two form a circular groove. One side of the impeller rear cover is located in the groove space of the circular groove, and the other side is flush with the opening surface of the circular groove. The central axis of the impeller rear cover coincides with the central axis of the circular groove, and the distance between the edge of the impeller rear cover and the inner wall of the circular groove is 1 mm. Since the diffuser is fixed on the rear side plate of the casing, it is not convenient to quickly disassemble and assemble the diffuser. Once damaged, it is difficult to replace it, which affects the use of the centrifugal fan. Therefore, a centrifugal fan is proposed to solve the above problems. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a centrifugal fan having the advantages of convenient disassembly and assembly, etc., solving the problem that the existing centrifugal fan diffuser centrifugal fan is inconvenient to disassemble and assemble.

[0006] To achieve the above object, the utility model provides the following technical solution: a centrifugal fan, comprising a shell, a motor is fixed on the right side of the shell, a blade is installed on the output shaft of the motor, a diffuser body is provided on the right side of the inner cavity of the shell, a mounting mechanism is provided on the right side of the shell, a fixing mechanism is provided on the left side of the inner cavity of the shell, and two cover plates are provided on the shell;

[0007] The mounting mechanism comprises two boxes fixed to the right side of the outer shell and two fixed blocks fixed to the right side of the diffuser body, telescopic rods are fixed to the opposite sides of the inner cavities of the two boxes, a first spring is sleeved on the outer surface of the telescopic rods, moving blocks are fixed to the opposite sides of the two telescopic rods, clamping rods are fixed to the opposite sides of the two moving blocks, a pull rod is fixed to the front of the moving block, and a clamping hole is opened on the upper surface of the fixed block.

[0008] Furthermore, the opposite sides of the two first springs are respectively fixed to the opposite sides of the inner cavities of the two boxes, and the opposite sides of the two first springs are respectively fixed to the opposite sides of the two moving blocks.

[0009] Furthermore, the clamping rod is slidably connected to the inside of the clamping hole, a sliding hole is opened on the front side of the box body, and the pull rod is slidably connected to the inside of the sliding hole.

[0010] Furthermore, two mounting holes are provided on the right side of the shell, and the fixing block is slidably connected to the inside of the mounting holes.

[0011] Furthermore, the fixing mechanism includes two shells fixed to the left side of the inner cavity of the shell, two fixing rods are fixed between the left and right sides of the inner cavity of the shell, the outer surfaces of the fixing rods are sleeved with second springs, the outer surfaces of the two fixing rods are slidably connected with movable plates, the left side of the movable plate is fixed with a connecting rod that penetrates and extends to the outside of the shell, the left side of the connecting rod is fixed with a horizontal plate, the right side of the horizontal plate is fixed with a plurality of card blocks, and the fixing mechanism also includes a connecting block fixed to the opposite side of the two cover plates, and the left side of the connecting block is provided with a plurality of card slots.

[0012] Furthermore, the card block is slidably connected to the inside of the card slot, and a handle is fixed on the left side of the horizontal plate.

[0013] Furthermore, the left side of the second spring is fixed to the left side of the inner cavity of the shell, and the right side of the second spring is fixed to the left side of the moving plate.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0015] 1. The centrifugal fan, through the installation mechanism, pulls the pull rod, drives the moving block and the clamping rod to move together and squeeze the first spring, inserts the fixed block into the installation hole, loosens the pull rod, resets the moving block, and makes the clamping rod clamp into the inside of the clamping hole to fix the fixed block and the diffuser body.

[0016] 2. The centrifugal fan, through the fixing mechanism, pulls the handle to drive the cross plate and the block to move together, and drives the connecting rod and the movable plate to move together and squeeze the second spring through the cross plate, so that the cover plate fits with the shell, releases the handle, and the movable plate is reset, driving the cross plate and the block to move together, so that the block is stuck in the inside of the slot to fix the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 For this utility model Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0019] Figure 3 For this utility model Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0020] In the figure: 1 shell, 2 mounting mechanism, 201 box, 202 telescopic rod, 203 first spring, 204 moving block, 205 pull rod, 206 clamping rod, 207 fixed block, 208 clamping hole, 3 diffuser body, 4 motor, 5 blades, 6 fixing mechanism, 601 shell, 602 fixed rod, 603 moving plate, 604 connecting rod, 605 second spring, 606 cross plate, 607 clamping block, 608 clamping slot, 609 connecting block, 7 cover plate. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1 A centrifugal fan in this embodiment includes a shell 1, a motor 4 is fixed on the right side of the shell 1, a blade 5 is installed on the output shaft of the motor 4, and the blade 5 is driven to rotate by the motor 4. A diffuser body 3 is provided on the right side of the inner cavity of the shell 1, and a mounting mechanism 2 is provided on the right side of the shell 1. The shell 1 mounts the diffuser body 3 through the mounting mechanism 2, and a fixing mechanism 6 is provided on the left side of the inner cavity of the shell 1. Two cover plates 7 are provided on the shell 1, and the cover plates 7 are mounted through the fixing mechanism 6.

[0023] See also Figure 2 In order to facilitate the disassembly and assembly of the diffuser body 3, the installation mechanism 2 in this embodiment includes two boxes 201 fixed to the right side of the shell 1 and two fixed blocks 207 fixed to the right side of the diffuser body 3. Telescopic rods 202 are fixed on the opposite sides of the inner cavities of the two boxes 201. The outer surface of the telescopic rod 202 is sleeved with a first spring 203, and the first spring 203 is made to perform a linear compression movement through the telescopic rod 202. Moving blocks 204 are fixed on the opposite sides of the two telescopic rods 202. The moving blocks 204 are made to perform a linear movement through the telescopic rod 202. Clamping rods 206 are fixed on the opposite sides of the two moving blocks 204. A pull rod 205 is fixed on the front of the moving block 204 for pulling the moving block 204 to move. A clamping hole 208 is opened on the upper surface of the fixed block 207.

[0024] Among them, the clamping rod 206 is slidably connected to the inside of the clamping hole 208 for installing the diffuser body 3. A sliding hole is opened on the front of the box body 201, and the pull rod 205 is slidably connected to the inside of the sliding hole, so that the pull rod 205 can drive the moving block 204 to move. Two mounting holes are opened on the right side of the outer shell 1, and the fixed block 207 is slidably connected to the inside of the mounting hole, which is convenient for limiting the fixed block 207.

[0025] In addition, the opposite sides of the two first springs 203 are respectively fixed to the opposite sides of the inner cavities of the two boxes 201, and the opposite sides of the two first springs 203 are respectively fixed to the opposite sides of the two moving blocks 204. The first springs 203 are used to reset the moving blocks 204, driving the clamping rod 206 to be clamped into the inside of the clamping hole 208, so as to install the diffuser body 3.

[0026] The installation mechanism 2 in this embodiment pulls the pull rod 205, drives the moving block 204 and the clamping rod 206 to move together and squeeze the first spring 203, inserts the fixed block 207 into the installation hole, loosens the pull rod 205, resets the moving block 204, and makes the clamping rod 206 clamped into the inside of the clamping hole 208, thereby fixing the fixed block 207 and the diffuser body 3.

[0027] See also Figure 3In order to install the cover plate 7, the fixing mechanism 6 in this embodiment includes two shells 601 fixed to the left side of the inner cavity of the shell 1, two fixing rods 602 are fixed between the left and right sides of the inner cavity of the shell 601, the outer surface of the fixing rod 602 is sleeved with a second spring 605, the outer surface of the two fixing rods 602 is slidably connected with a moving plate 603, and the moving plate 603 is reset by the second spring 605. A connecting rod 604 that penetrates and extends to the outside of the shell 1 is fixed on the left side of the moving plate 603, a horizontal plate 606 is fixed on the left side of the connecting rod 604, and a plurality of card blocks 607 are fixed on the right side of the horizontal plate 606. The fixing mechanism 6 also includes a connecting block 609 fixed to the opposite side of the two cover plates 7, and a plurality of card slots 608 are opened on the left side of the connecting block 609.

[0028] The card block 607 is slidably connected to the inside of the card slot 608 for installing the connection block 609 and the cover plate 7. A handle is fixed on the left side of the horizontal plate 606 to facilitate pulling the horizontal plate 606 to move.

[0029] In addition, the left side of the second spring 605 is fixed to the left side of the inner cavity of the shell 601, and the right side of the second spring 605 is fixed to the left side of the movable plate 603. The movable plate 603 is reset by the second spring 605, driving the block 607 to be inserted into the inside of the slot 608 to fix the cover 7.

[0030] The fixing mechanism 6 in this embodiment pulls the handle to drive the horizontal plate 606 and the block 607 to move together, and the horizontal plate 606 drives the connecting rod 604 and the movable plate 603 to move together and squeeze the second spring 605, so that the cover plate 7 is fitted with the shell 1. The handle is released, and the movable plate 603 is reset, driving the horizontal plate 606 and the block 607 to move together, so that the block 607 is stuck in the inside of the slot 608, and the cover plate 7 is fixed.

[0031] The working principle of the above embodiment is:

[0032] (1) Pull the two pull rods 205 relative to each other. The pull rods 205 drive the moving block 204 to slide inside the box body 201 and squeeze the first spring 203 and the telescopic rod 202. When the moving block 204 moves, it drives the clamping rod 206 to move together. At this time, the fixed block 207 on the right side of the diffuser body 3 is inserted into the installation hole. The pull rod 205 is released. The moving block 204 is reset under the action of the first spring 203, driving the clamping rod 206 to clamp into the inside of the clamping hole 208, thereby fixing the fixed block 207 and the diffuser body 3.

[0033] (2) Pull the handle to the left, and the handle will drive the horizontal plate 606 and the block 607 to move together. The horizontal plate 606 will drive the connecting rod 604 and the movable plate 603 to move together. The movable plate 603 will slide on the outer surface of the fixed rod 602 and squeeze the second spring 605. At this time, the cover plate 7 is fitted with the shell 1 so that the right side of the connecting block 609 abuts against the left side of the shell 1. Release the handle, and the movable plate 603 will reset under the action of the second spring 605, driving the horizontal plate 606 and the block 607 to move together, so that the block 607 is stuck in the inside of the slot 608, thereby fixing the cover plate 7.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifugal fan, comprising a housing (1), characterized in that: A motor (4) is fixed on the right side of the housing (1), a blade (5) is installed on the output shaft of the motor (4), a diffuser body (3) is provided on the right side of the inner cavity of the housing (1), a mounting mechanism (2) is provided on the right side of the housing (1), a fixing mechanism (6) is provided on the left side of the inner cavity of the housing (1), and two cover plates (7) are provided on the housing (1); The mounting mechanism (2) comprises two boxes (201) fixed to the right side of the outer shell (1) and two fixed blocks (207) fixed to the right side of the diffuser body (3); telescopic rods (202) are fixed to the opposite sides of the inner cavities of the two boxes (201); the outer surface of the telescopic rods (202) is sleeved with a first spring (203); the opposite sides of the two telescopic rods (202) are fixed with moving blocks (204); the opposite sides of the two moving blocks (204) are fixed with clamping rods (206); the front sides of the moving blocks (204) are fixed with pull rods (205); and the upper surface of the fixed blocks (207) is provided with clamping holes (208).

2. A centrifugal fan according to claim 1, characterized in that: The opposite sides of the two first springs (203) are respectively fixed to the opposite sides of the inner cavities of the two boxes (201), and the opposite sides of the two first springs (203) are respectively fixed to the opposite sides of the two moving blocks (204).

3. A centrifugal fan according to claim 1, characterized in that: The clamping rod (206) is slidably connected to the inside of the clamping hole (208); a sliding hole is provided on the front of the box body (201); and the pull rod (205) is slidably connected to the inside of the sliding hole.

4. A centrifugal fan according to claim 1, characterized in that: Two mounting holes are provided on the right side of the housing (1), and the fixing block (207) is slidably connected to the inside of the mounting holes.

5. A centrifugal fan according to claim 1, characterized in that: The fixing mechanism (6) comprises two shells (601) fixed to the left side of the inner cavity of the shell (1), two fixing rods (602) are fixed between the left and right sides of the inner cavity of the shell (601), the outer surfaces of the fixing rods (602) are sleeved with second springs (605), the outer surfaces of the two fixing rods (602) are slidably connected with movable plates (603), the left side of the movable plates (603) is fixed with a connecting rod (604) that penetrates and extends to the outside of the shell (1), the left side of the connecting rod (604) is fixed with a transverse plate (606), and the right side of the transverse plate (606) is fixed with a plurality of card blocks (607), and the fixing mechanism (6) also comprises a connecting block (609) fixed to the opposite side of the two cover plates (7), and the left side of the connecting block (609) is provided with a plurality of card slots (608).

6. A centrifugal fan according to claim 5, characterized in that: The card block (607) is slidably connected to the inside of the card slot (608), and a handle is fixed on the left side of the horizontal plate (606).

7. A centrifugal fan according to claim 5, characterized in that: The left side of the second spring (605) is fixed to the left side of the inner cavity of the housing (601), and the right side of the second spring (605) is fixed to the left side of the moving plate (603).

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