High-efficiency multistage multi-pressure centrifugal fan

Abstract

The application relates to the technical field of centrifugal fans, in particular to a high-efficiency multistage multi-pressure centrifugal fan, which comprises a front shell, a rear shell and an impeller driving mechanism, the impeller driving mechanism is arranged on the front shell and the rear shell, and further comprises two sealing ring grooves, the two sealing ring grooves are fixedly connected to the front shell and the rear shell respectively, and a sealing gasket is arranged between the two sealing ring grooves; a connecting mechanism is arranged on the front shell and the rear shell, the connecting mechanism comprises four fixed plates and four fixed blocks, the four fixed plates are fixedly connected to the front shell, the cooperation of the sealing gasket and the two sealing ring grooves facilitates the sealing of the gap between the front shell and the rear shell, the air leakage is avoided, the energy saving and efficiency are higher, the cooperation of springs, limiting blocks and limiting plates facilitates the connection of the fixed blocks and the fixed plates, thereby facilitating the assembly and disassembly of the front shell and the rear shell, the operation is simple and fast, and the practicability is improved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, specifically a high-efficiency multi-stage multi-pressure centrifugal fan. Background Technology

[0002] Currently, most high static pressure fans use single-stage large impeller centrifugal fans or multi-stage cast iron fans. Among them, single-stage large impeller fans have excessive motor starting load due to the large impeller, which frequently leads to motor burnout accidents. In contrast, the air inlet and outlet of multi-stage cast iron fans are located above the impeller, and there is no air guiding structure on the multi-stage impeller for air guidance. After long-term use, the fan casing is prone to wear. At the same time, the cost of multi-stage cast iron fans is relatively high, and the replacement cost after the casing wears out is also high.

[0003] A search revealed a utility model patent in China with patent publication number CN217761351U, which discloses a multi-stage centrifugal fan. The fan is described as including a multi-stage centrifugal fan housing, comprising a front housing and a rear housing. In operation, an inlet impeller, a booster impeller, and a guide impeller assembly rotate and pressurize the air introduced from the induced draft block before discharging it upwards. The multi-stage impeller configuration reduces impeller volume, sequentially inlet, booster, and guide air. The turbine-spiral structure of the multi-stage centrifugal fan housing allows for better air delivery, reducing motor load and casing damage, resulting in greater energy efficiency. However, this device has certain shortcomings. For example, the front and rear housings are directly connected by bolts without a sealing mechanism, leading to poor sealing and potential air leakage, increasing energy consumption. Furthermore, the use of multiple bolts for assembly and disassembly is cumbersome and time-consuming. Therefore, we propose a high-efficiency multi-stage multi-pressure centrifugal fan. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a high-efficiency multi-stage multi-pressure centrifugal fan to solve the problems mentioned in the background art. The front and rear housings are directly fixedly connected by bolt groups, and there is no sealing mechanism between them. The gaps are poorly sealed, which may lead to air leakage, increasing energy consumption. In addition, the use of multiple bolts for assembly and fixing makes installation and disassembly cumbersome and time-consuming.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency multi-stage multi-pressure centrifugal fan, comprising a front casing, a rear casing, and an impeller drive mechanism, wherein the impeller drive mechanism is disposed on the front casing and the rear casing, and further comprising:

[0008] Two sealing ring grooves are fixedly connected to the front housing and the rear housing respectively, and a sealing gasket is provided between the two sealing ring grooves;

[0009] A connecting mechanism is provided on the front housing and the rear housing for convenient connection.

[0010] Preferably, the connecting mechanism includes four fixing plates and four fixing blocks. All four fixing plates are fixedly connected to the front housing, and all four fixing blocks are fixedly connected to the rear housing. Each fixing plate has an opening, a sliding groove, and a control port. The opening is connected to the sliding groove, and the sliding groove is connected to the control port. A limit block is slidably connected within the sliding groove. A spring is provided between the limit block and the sliding groove. A control block is fixedly connected to the limit block, located within the control port. Each fixing block has an opening, within which a limit plate is placed. A limit opening is provided on the limit plate, with one end of the limit plate located within the opening and one end of the limit block located within the limit opening, facilitating the connection between the front and rear housings.

[0011] Furthermore, the fixing block has a groove that communicates with the opening two, and an adjusting block is fixedly connected to the limiting plate, with a pull ring rotatably connected to the adjusting block.

[0012] Furthermore, both the control block and the pull ring are provided with anti-slip textures.

[0013] Furthermore, two positioning plates are fixedly connected to the fixing block, and the fixing plate is located between the two positioning plates.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, this utility model provides a high-efficiency multi-stage multi-pressure centrifugal fan, which has the following beneficial effects:

[0016] This high-efficiency multi-stage multi-pressure centrifugal fan, through the cooperation of a sealing gasket and two sealing ring grooves, facilitates the sealing of the gap between the front and rear housings, preventing air leakage and making it more energy-efficient. The cooperation of springs, limit blocks, and limit plates makes it easy to connect the fixing blocks and fixing plates together, thus facilitating the installation and removal of the front and rear housings. The operation is simple and quick, improving its practicality. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present application;

[0018] Figure 2 This is a partial cross-sectional view of the three-dimensional structure of this application;

[0019] Figure 3This is a three-dimensional structural diagram of the spring, limiting block, and other components used in this application.

[0020] Figure 4 For this application Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0021] In the diagram: 1. Front housing; 2. Rear housing; 3. Impeller drive mechanism; 4. Sealing ring groove; 5. Sealing gasket; 6. Fixing plate; 7. Fixing block; 8. Limiting block; 9. Spring; 10. Control block; 11. Limiting plate; 12. Limiting port; 13. Groove; 14. Adjusting block; 15. Pull ring; 16. Anti-slip texture; 17. Positioning plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example

[0024] Please see Figures 1-4 A high-efficiency multi-stage multi-pressure centrifugal fan includes a front casing 1, a rear casing 2, and an impeller drive mechanism 3. The impeller drive mechanism 3 is disposed on the front casing 1 and the rear casing 2. It also includes:

[0025] Two sealing ring grooves 4 are fixedly connected to the front housing 1 and the rear housing 2 respectively, and a sealing gasket 5 is provided between the two sealing ring grooves 4.

[0026] A connecting mechanism is provided on the front housing 1 and the rear housing 2 to facilitate connection.

[0027] Preferably, the connecting mechanism includes four fixing plates 6 and four fixing blocks 7. The four fixing plates 6 are all fixedly connected to the front housing 1, and the four fixing blocks 7 are all fixedly connected to the rear housing 2. The fixing plates 6 have an opening 1, a sliding groove, and a control port. The opening 1 is connected to the sliding groove, and the sliding groove is connected to the control port. A limit block 8 is slidably connected in the sliding groove. A spring 9 is provided between the limit block 8 and the sliding groove. A control block 10 is fixedly connected to the limit block 8 and is located in the control port. The fixing blocks 7 have an opening 2, in which a limit plate 11 is placed. A limit port 12 is provided on the limit plate 11. One end of the limit plate 11 is located in the opening 1, and one end of the limit block 8 is located in the limit port 12. The spring 9 is used to provide elastic force, and the limit block 8 is used to lock in the limit plate 11. The limit plate 11 and the limit block 8 are used to connect the fixing plates 6 and the fixing blocks 7, thereby achieving the purpose of connecting and fixing the front housing 1 and the rear housing 2.

[0028] The fixing block 7 has a groove 13, which is connected to the opening 2. The limiting plate 11 is fixedly connected to the adjusting block 14, and the adjusting block 14 is rotatably connected to the pull ring 15, which is used to facilitate the staff to remove the limiting plate 11.

[0029] Both the control block 10 and the pull ring 15 are provided with anti-slip textures 16 to increase friction and facilitate use by staff.

[0030] Two positioning plates 17 are fixedly connected to the fixing block 7. The fixing plate 6 is located between the two positioning plates 17 and is used for positioning to facilitate accurate docking of the front housing 1 and the rear housing 2.

[0031] In summary, the working principle and process of this high-efficiency multi-stage multi-pressure centrifugal fan are as follows: First, place the high-efficiency multi-stage multi-pressure centrifugal fan at the desired location. During use, first place the sealing gasket 5 in the sealing ring groove 4 on one side. Then, align the front housing 1 with the rear housing 2, moving the fixing plate 6 between the two positioning plates 17. At this point, the two sealing ring grooves 4 will clamp the sealing gasket 5, sealing the gap between the front housing 1 and the rear housing 2. Next, insert the limiting plate 11 into the opening two on the fixing block 7. When the limiting plate 11 rests against the limiting block 8, slide the control block 10. The control block 10 will move and adjust the limiting block 8, compressing the spring 9. After the limiting block 8 no longer blocks the limiting plate 11, the limiting plate 11 can be fully pushed into the fan. When openings one and two are closed, the limiting port 12 is aligned with the limiting block 8. Releasing the control block 10 causes the spring 9 to rebound, moving the limiting block 8 and locking it into the limiting port 12. This completes the connection and fixation between the front housing 1 and the rear housing 2. The operation is simple and quick, improving practicality. The front housing 1, rear housing 2, and impeller drive mechanism 3 involved in this solution are authorized technologies disclosed in Chinese Patent Publication (Announcement) No. CN217761351U. Their internal structure and working principle are well known to those skilled in the art and are not the innovation of this patent. The innovation of this patent lies in the sealing and convenient connection between the front housing 1 and the rear housing 2, improving practicality. Therefore, this patent will not elaborate on their internal structure and working principle.

[0032] The above embodiments merely illustrate specific implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A high-efficiency multi-stage multi-pressure centrifugal fan, comprising a front casing (1), a rear casing (2), and an impeller drive mechanism (3), wherein the impeller drive mechanism (3) is disposed on the front casing (1) and the rear casing (2), characterized in that, Also includes: Two sealing ring grooves (4) are fixedly connected to the front housing (1) and the rear housing (2) respectively, and a sealing gasket (5) is provided between the two sealing ring grooves (4); A connecting mechanism is provided on the front housing (1) and the rear housing (2) for convenient connection.

2. The high-efficiency multi-stage multi-pressure centrifugal fan according to claim 1, characterized in that: The connecting mechanism includes four fixed plates (6) and four fixed blocks (7). The four fixed plates (6) are fixedly connected to the front housing (1), and the four fixed blocks (7) are fixedly connected to the rear housing (2). The fixed plates (6) have an opening, a groove and a control port. The opening is connected to the groove, and the groove is connected to the control port. A limit block (8) is slidably connected in the groove. A spring (9) is provided between the limit block (8) and the groove. A control block (10) is fixedly connected to the limit block (8). The control block (10) is located in the control port. The fixed blocks (7) have an opening, and a limit plate (11) is placed in the opening. A limit port (12) is opened on the limit plate (11). One end of the limit plate (11) is located in the opening, and one end of the limit block (8) is located in the limit port (12).

3. The high-efficiency multi-stage multi-pressure centrifugal fan according to claim 2, characterized in that: The fixing block (7) has a groove (13) connected to the opening two. An adjusting block (14) is fixedly connected to the limiting plate (11), and a pull ring (15) is rotatably connected to the adjusting block (14).

4. The high-efficiency multi-stage multi-pressure centrifugal fan according to claim 3, characterized in that: Both the control block (10) and the pull ring (15) are provided with anti-slip texture (16).

5. A high-efficiency multi-stage multi-pressure centrifugal fan according to claim 4, characterized in that: Two positioning plates (17) are fixedly connected to the fixing block (7), and the fixing plate (6) is located between the two positioning plates (17).

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