A double-stage impeller cabinet fire-fighting centrifugal fan

Abstract

This utility model belongs to the field of centrifugal fan technology, specifically disclosing a two-stage impeller cabinet-type fire-fighting centrifugal fan, including: impellers A and B with elastic mounting structures; elastic compensation rings on both sides embedded in mating grooves on impellers A and B; limiting frames A and B fastened to the outside of impeller A; limiting frames C and D fastened to the outside of impeller B; each end of limiting frames A and B has an integrally fixed mounting frame A; each end of limiting frames C and D has an integrally fixed mounting frame B; both ends of the connecting part pass through mounting frames B and A; a self-locking washer is attached to the outside of mounting frame A; both ends of a fixing plate are respectively fitted onto the two ends of the connecting part; a nut is fitted onto the end of the connecting part and abuts against the outside of the fixing plate. This utility model automatically compensates for the axial clearance between impellers A and B when the elastic compensation ring expands at high temperature, avoiding friction.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fan technology, specifically a two-stage impeller cabinet-type fire-fighting centrifugal fan. Background Technology

[0002] Centrifugal fans are machines that rely on input mechanical energy to increase gas pressure and discharge gas. They are a type of driven fluid machinery. Centrifugal fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings for ventilation, dust removal, and cooling; in boilers and industrial furnaces for ventilation and induced draft; in air conditioning equipment and household appliances for cooling and ventilation; in grain drying and conveying; in wind tunnels for air supply and inflating and propelling hovercraft, etc. Fire-fighting fans need to withstand temperatures above 300°C when exhausting smoke. When the metal impeller (such as 310S stainless steel) is heated and expands, the axial clearance will shrink, which can easily lead to the two-stage impeller or the impeller rubbing against the casing and getting stuck. Utility Model Content

[0003] The purpose of this invention is to provide a two-stage impeller cabinet-type fire-fighting centrifugal fan to solve the above problems.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a two-stage impeller cabinet-type fire-fighting centrifugal fan, comprising;

[0005] Impeller A and impeller B, one end of impeller A has a fixedly connected blade ring A, one end of impeller B has a fixedly connected blade ring B, impeller A and impeller B have elastic mounting structures, the elastic mounting structures include limit frame A, limit frame B, limit frame C, limit frame D, elastic compensation ring, connecting part, fixed plate, self-locking washer, and nut.

[0006] Impeller A and impeller B are coaxial. Both blade ring A and positioning block A are provided with mating grooves. The two sides of the elastic compensation ring are embedded in the mating grooves on blade ring A and blade ring B. Limiting frame A and limiting frame B are fastened to the outside of blade ring A, and limiting frame C and limiting frame D are fastened to the outside of blade ring B. Limiting frame A and limiting frame B, as well as limiting frame C and limiting frame D, are all circular.

[0007] Both ends of limit frame A and limit frame B are integrally fixed with mounting bracket A. Both ends of limit frame C and limit frame D are integrally fixed with mounting bracket B. Both ends of the connecting part pass through mounting bracket B and mounting bracket A. The self-locking washer is attached to the outside of mounting bracket A. Both ends of the fixing plate are respectively fitted onto both ends of the connecting part. The nut is fitted onto the end of the connecting part and abuts against the outside of the fixing plate.

[0008] Preferably, the elastic compensation ring is made of silicone heat-resistant sealant. When the elastic compensation ring expands at high temperature, it automatically compensates for the axial clearance between impeller A and impeller B, avoiding friction. When impeller A and impeller B rotate at high speed, airflow pulsation and rotor dynamic imbalance will cause high-frequency vibration. As a flexible interface, the elastic compensation ring can attenuate the high-frequency vibration energy of 5-15kHz, reducing the impact load transmitted to the bearing and motor.

[0009] Preferably, impeller A has multiple integrally fixed positioning blocks A, the inner side of limit frame A has multiple integrally fixed limit blocks A, and the inner side of limit frame B has multiple integrally fixed limit blocks B. Limit blocks A and limit frames B are both fastened to the outer side of positioning blocks A. Limit blocks A and B are engaged with positioning blocks A to achieve linkage between limit frame A and limit frame B and impeller A. When impeller A rotates, limit frame A and limit frame B are driven synchronously.

[0010] Preferably, the impeller B has multiple integrally fixed positioning blocks B, the inner side of the limiting frame C has multiple integrally fixed limiting blocks C, and the inner side of the limiting frame D has multiple integrally fixed limiting blocks D. The limiting blocks C and the limiting frame D are both fastened to the outer side of the positioning blocks B. The limiting blocks C and D are engaged with the positioning blocks B to achieve linkage between the limiting frame C and the limiting frame D and the impeller B. When the limiting frame A and the limiting frame B are rotated, the limiting frame C and the limiting frame D are driven synchronously.

[0011] Preferably, one end of the impeller A has a fixed connection and a snap-fit ​​assembly, which includes a positioning frame, a drive rod, a chuck, a spiral cap, a fixing frame, and a pull rod;

[0012] The positioning frame is fixedly connected to the outer wall and has multiple integrally fixed shafts. The chuck is embedded inside the positioning frame and engages with it. One end of the drive rod is fixedly connected to the chuck, and the fixed frame is sleeved on the outside of the drive rod and slidably connected to it. One end of the pull rod is hinged to the fixed frame, and the other end of the pull rod is fastened to the outside of the fixed shaft for locking and limiting. A screw cap is sleeved on one end of the fixed frame and rotatably connected to it. The end of the screw cap away from the fixed frame is sleeved on the outside of the drive rod and threadedly connected to it. One end of the drive rod has a hexagonal slot. The drive rod of the motor can be directly driven to rotate through the hexagonal slot, thereby driving impeller A and impeller B to rotate at high speed. By rotating the screw cap, the distance between the fixed frame and the chuck can be adjusted, thereby tightening or separating the pull rod from the fixed shaft. The installation through the pull rod locking method greatly improves the convenience of equipment maintenance and reduces the time for disassembly and installation.

[0013] Preferably, the motor drive end is inserted into the hexagonal slot at one end of the drive rod, and the drive rod is rotated to rotate, so that the drive rod is driven to rotate through the positioning frame. When rotating downwards, it drives the impeller A to rotate. Both the limiting block A and the limiting frame B are fastened to the outside of the positioning block A. The limiting blocks A and B are engaged with the positioning block A to limit the movement, so that the limiting frame A and the limiting frame B are linked with the impeller A. When the impeller A is rotated, the limiting frame A and the limiting frame B are driven synchronously. Both the limiting block C and the limiting frame D are fastened to the outside of the positioning block B. The limiting blocks C and the limiting frame D are engaged with the positioning block B to limit the movement, so that the limiting frame C and the limiting frame D are linked with the impeller B. When the limiting frame A and the limiting frame B are rotated, the limiting frame C and the limiting frame D are driven synchronously to achieve overall linkage.

[0014] Preferably, impeller A and impeller B in this utility model are installed inside the casing of the cabinet-type fire-fighting centrifugal fan. The casing of the cabinet-type fire-fighting centrifugal fan is already quite common and is not considered a key technical feature of this utility model, so it has not been described in detail in the text.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. When impeller A and impeller B rotate, the elastic compensation ring moves in conjunction between impeller A and impeller B. The elastic compensation ring is made of silicone heat-resistant sealant. When the elastic compensation ring expands at high temperature, it automatically compensates for the axial clearance between impeller A and impeller B to avoid friction. When impeller A and impeller B rotate at high speed, airflow pulsation and rotor dynamic imbalance will cause high-frequency vibration. As a flexible interface, the elastic compensation ring can attenuate the high-frequency vibration energy of 5-15kHz and reduce the impact load transmitted to the bearing and motor.

[0017] 2. The distance between the fixed bracket and the chuck can be adjusted by rotating the screw cap, thereby tightening or separating the tie rod from the fixed shaft. The installation method of tie rod clamping greatly improves the convenience of equipment maintenance and reduces the time for disassembly and installation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0020] Figure 3 This utility model is a structural explosion Figure 1 ;

[0021] Figure 4 This utility model is a structural explosion Figure 2 ;

[0022] Figure 5 This utility model Figure 1 Enlarged structural diagram of section A in the middle.

[0023] In the diagram: 100, Impeller A; 101, Blade Ring A; 102, Positioning Block A; 200, Impeller B; 201, Blade Ring B; 202, Positioning Block B; 300, Limiting Frame A; 301, Limiting Block A; 302, Limiting Frame B; 303, Limiting Block B; 304, Mounting Frame A; 400, Limiting Frame C; 401, Limiting Block C; 402, Limiting Frame D; 403, Limiting Block D; 404, Mounting Frame B; 500, Elastic Compensation Ring; 600, Positioning Frame; 601, Fixed Shaft; 602, Drive Rod; 603, Chuck; 604, Screw Cap; 605, Fixed Frame; 606, Tie Rod; 700, Connecting Part; 701, Fixed Disc; 702, Self-Locking Washer; 703, Nut. Detailed Implementation

[0024] 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.

[0025] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Please see Figure 1-5 This utility model provides a technical solution: a two-stage impeller cabinet-type fire-fighting centrifugal fan, comprising;

[0028] Impeller A100 and impeller B200, one end of impeller A100 has a fixedly connected blade ring A101, one end of impeller B200 has a fixedly connected blade ring B201, impeller A100 and impeller B200 have elastic mounting structures, the elastic mounting structures include limit frame A300, limit frame B302, limit frame C400, limit frame D402, elastic compensation ring 500, connecting part 700, fixed plate 701, self-locking washer 702, and nut 703;

[0029] Impeller A100 and impeller B200 are coaxial. Both blade ring A101 and positioning block A102 are provided with mating grooves. The two sides of elastic compensation ring 500 are embedded in the mating grooves on blade ring A101 and blade ring B201. Limiting frame A300 and limiting frame B302 are fastened to the outside of blade ring A101. Limiting frame C400 and limiting frame D402 are fastened to the outside of blade ring B201. The enclosure of limiting frame A300 and limiting frame B302 as well as limiting frame C400 and limiting frame D402 is circular.

[0030] Both ends of the limiting bracket A300 and the limiting bracket B302 are integrally fixed with mounting bracket A304. Both ends of the limiting bracket C400 and the limiting bracket D402 are integrally fixed with mounting bracket B404. Both ends of the connecting part 700 pass through the mounting bracket B404 and the mounting bracket A304. The self-locking washer 702 is attached to the outside of the mounting bracket A304. Both ends of the fixing plate 701 are respectively fitted onto both ends of the connecting part 700. The nut 703 is fitted onto the end of the connecting part 700 and abuts against the outside of the fixing plate 701.

[0031] Furthermore, the elastic compensation ring 500 is made of silicone heat-resistant sealant. When the elastic compensation ring 500 expands at high temperature, it automatically compensates for the axial clearance between impeller A100 and impeller B200 to avoid friction. When impeller A100 and impeller B200 rotate at high speed, airflow pulsation and rotor dynamic imbalance will cause high-frequency vibration. As a flexible interface, the elastic compensation ring 500 can attenuate the high-frequency vibration energy of 5–15kHz and reduce the impact load transmitted to the bearings and motor.

[0032] Furthermore, the impeller A100 has multiple integrally fixed positioning blocks A102, the inner side of the limiting frame A300 has multiple integrally fixed limiting blocks A301, and the inner side of the limiting frame B302 has multiple integrally fixed limiting blocks B303. The limiting blocks A301 and B302 are both fastened to the outer side of the positioning block A102. By engaging and limiting the positioning blocks A102 with the limiting blocks A301 and B303, the limiting frame A300 and B302 are linked with the impeller A101. When the impeller A101 rotates, the limiting frame A300 and B302 are driven synchronously.

[0033] Furthermore, the impeller B200 has multiple integrally fixed positioning blocks B202, the inner side of the limit frame C400 has multiple integrally fixed limit blocks C401, and the inner side of the limit frame D402 has multiple integrally fixed limit blocks D403. The limit blocks C401 and the limit frame D402 are all fastened to the outer side of the positioning block B202. The limit blocks C401 and D403 are engaged with the positioning block B202 to limit the movement, thereby realizing the linkage between the limit frame C400 and the limit frame D402 and the impeller B201. When the limit frame A300 and the limit frame B302 are rotated, the limit frame C400 and the limit frame D402 are driven synchronously.

[0034] Furthermore, one end of the impeller A100 has a fixed connection 103, and 103 has a snap-fit ​​assembly, which includes a positioning frame 600, a drive rod 602, a chuck 603, a spiral cap 604, a fixing frame 605, and a pull rod 606.

[0035] The positioning frame 600 is fixedly connected to the outer wall of 103, and has multiple integrally fixed shafts 601. The chuck 603 is embedded inside the positioning frame 600 and engaged with it. One end of the drive rod 602 is fixedly connected to the chuck 603. The fixing frame 605 is sleeved on the outside of the drive rod 602 and slidably connected to it. One end of the pull rod 606 is hinged to the fixing frame 605, and the other end of the pull rod 606 is fastened to the outside of the fixing shafts 601 for locking and limiting. The screw cap 604 is sleeved on one end of the fixing frame 605 and rotatably connected to it. The screw cap 604 is away from the fixing frame. One end of 605 is threaded onto the outside of the drive rod 602, and one end of the drive rod 602 is provided with a hexagonal slot. The drive rod of the motor is connected through the hexagonal slot, which can directly drive the drive rod 602 to rotate, thereby driving the impeller A100 and impeller B200 to rotate at high speed. The distance between the fixed frame 605 and the chuck 603 can be adjusted by rotating the spiral cap 604, thereby tightening or separating the pull rod 606 from the fixed shaft 601. The installation by the snap-fit ​​of the pull rod 606 greatly improves the convenience of equipment maintenance and reduces the time for disassembly and installation.

[0036] Working principle: In use, insert the motor drive end into the hexagonal slot at one end of the drive rod 602, and rotate the drive rod 602 to rotate, so that the drive rod 602 drives 103 to rotate through the positioning frame 600. When 103 rotates downward, it drives the impeller A100 to rotate. The limit block A301 and the limit frame B302 are both fastened to the outside of the positioning block A102. The limit block A301 and the limit block B303 are engaged with the positioning block A102 to limit the movement, thereby realizing the connection between the limit frame A300 and the limit frame B302 and the impeller A100. 01. To achieve linkage, when the blade ring A101 rotates, the limiting frame A300 and the limiting frame B302 are driven synchronously. The limiting block C401 and the limiting frame D402 are both fastened to the outside of the positioning block B202. The limiting block C401 and the limiting block D403 are engaged with the positioning block B202 to limit the movement, thereby achieving linkage between the limiting frame C400 and the limiting frame D402 and the blade ring B201. When the limiting frame A300 and the limiting frame B302 rotate, the limiting frame C400 and the limiting frame D402 are driven synchronously, thus achieving overall linkage.

[0037] Furthermore, when impeller A100 and impeller B200 rotate, the elastic compensation ring 500 is linked between impeller ring A101 and impeller ring B201. The elastic compensation ring 500 is made of silicone heat-resistant sealant. When the elastic compensation ring 500 expands at high temperature, it automatically compensates for the axial clearance between impeller A100 and impeller B200 to avoid friction. When impeller A100 and impeller B200 rotate at high speed, airflow pulsation and rotor dynamic imbalance will cause high-frequency vibration. As a flexible interface, the elastic compensation ring 500 can attenuate the high-frequency vibration energy of 5-15kHz and reduce the impact load transmitted to the bearing and motor.

[0038] Furthermore, by rotating the screw cap 604, the distance between the fixing bracket 605 and the chuck 603 can be adjusted, thereby tightening or separating the pull rod 606 from the fixing shaft 601. The installation by means of the pull rod 606 snap-fit ​​greatly improves the convenience of equipment maintenance and reduces the time for disassembly and installation.

[0039] Furthermore, the impellers A100 and B200 in this utility model are installed inside the casing of the cabinet-type fire-fighting centrifugal fan. The casing of the cabinet-type fire-fighting centrifugal fan is already quite common and is not considered a key technical feature of this utility model, so it is not described in detail in the text.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A two-stage impeller cabinet fire-fighting centrifugal fan, characterized in that: include; Impeller A (100) and impeller B (200), one end of impeller A (100) has a fixedly connected blade ring A (101), and one end of impeller B (200) has a fixedly connected blade ring B (201). Impeller A (100) and impeller B (200) have elastic mounting structures, the elastic mounting structures including limit frame A (300), limit frame B (302), limit frame C (400), limit frame D (402), elastic compensation ring (500), connecting part (700), fixed plate (701), self-locking washer (702), and nut (703); Impeller A (100) and impeller B (200) are coaxial. Both blade ring A (101) and positioning block A (102) are provided with mating grooves. The two sides of the elastic compensation ring (500) are embedded in the mating grooves on blade ring A (101) and blade ring B (201). Limiting frame A (300) and limiting frame B (302) are fastened to the outside of blade ring A (101). Limiting frame C (400) and limiting frame D (402) are fastened to the outside of blade ring B (201). The enclosure of limiting frame A (300) and limiting frame B (302) as well as limiting frame C (400) and limiting frame D (402) is circular. Both ends of the limiting frame A (300) and the limiting frame B (302) are integrally fixed with mounting frame A (304), and both ends of the limiting frame C (400) and the limiting frame D (402) are integrally fixed with mounting frame B (404). Both ends of the connecting part (700) pass through the mounting frame B (404) and the mounting frame A (304). The self-locking washer (702) is attached to the outside of the mounting frame A (304). Both ends of the fixing plate (701) are respectively sleeved on both ends of the connecting part (700), and the nut (703) is sleeved on the end of the connecting part (700) and abuts against the outside of the fixing plate (701).

2. A two-stage impeller cabinet fire-fighting centrifugal fan according to claim 1, characterized in that: The elastic compensation ring (500) is made of silicone heat-resistant sealant.

3. A two-stage impeller cabinet-type fire-fighting centrifugal fan according to claim 1, characterized in that: The impeller A (100) has multiple integrally fixed positioning blocks A (102), the inner side of the limiting frame A (300) has multiple integrally fixed limiting blocks A (301), the inner side of the limiting frame B (302) has multiple integrally fixed limiting blocks B (303), and the limiting blocks A (301) and the limiting frame B (302) are both fastened to the outer side of the positioning block A (102).

4. A two-stage impeller cabinet fire-fighting centrifugal fan according to claim 1, characterized in that: The impeller B (200) has multiple integrally fixed positioning blocks B (202), the inner side of the limiting frame C (400) has multiple integrally fixed limiting blocks C (401), and the inner side of the limiting frame D (402) has multiple integrally fixed limiting blocks D (403). The limiting blocks C (401) and the limiting frame D (402) are both fastened to the outer side of the positioning block B (202).

5. A two-stage impeller cabinet fire-fighting centrifugal fan according to claim 1, characterized in that: One end of the impeller A (100) has a fixed connection (103), and the (103) has a snap-fit ​​assembly, which includes a positioning frame (600), a drive rod (602), a chuck (603), a spiral cap (604), a fixing frame (605), and a pull rod (606). The positioning frame (600) is fixedly connected to the outer wall of (103), and the positioning frame (600) has multiple integrally fixed shafts (601). The chuck (603) is embedded inside the positioning frame (600) and engaged with it. One end of the drive rod (602) is fixedly connected to the chuck (603). The fixing frame (605) is sleeved on the outside of the drive rod (602) and slidably connected with it. One end of the pull rod (606) is hinged to the fixing frame (605), and the other end of the pull rod (606) is fastened to the fixing frame (605). The outer side of the fixed shaft (601) is snapped and limited. The spiral cap (604) is sleeved on one end of the fixed frame (605) and rotated therewith. The end of the spiral cap (604) away from the fixed frame (605) is sleeved on the outer side of the drive rod (602) and threaded therewith. One end of the drive rod (602) is provided with a hexagonal slot. The drive rod of the motor is connected through the hexagonal slot and can directly drive the drive rod (602) to rotate, thereby driving impeller A (100) and impeller B (200) to rotate at high speed.

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