Centrifugal fan

Abstract

The invention relates to the technical field of cooling fans, and discloses a centrifugal fan which comprises a motor, a volute, an impeller and a health monitoring system. The motor is a water-cooled motor; the volute is fixed at the output end of the motor; the impeller is arranged in the volute and is in transmission connection with the output end of the motor; the health monitoring system is arranged on the volute and used for monitoring the temperature and vibration of the motor. By means of the arrangement, the fan capable of monitoring the running health condition of the fan is provided, the water-cooled motor is adopted, the fan can work at the high environment temperature, and the temperature rise value of the motor does not exceed the maximum allowable temperature rise. The health monitoring system further ensures that important performance parameters such as motor temperature and vibration of the fan are kept in a normal range, the service life of the fan is prolonged, and smooth operation of the fan is guaranteed.

Description

Technical Field

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

[0002] The fan is an important component in ventilation and cooling applications. When each system requires ventilation and cooling, the fan is installed in the pipe network system. The inlet and outlet ends are generally connected to pipes, radiators, etc. The temperature of the air sucked from the radiator is generally more than 10 degrees higher than the air temperature. When the fan motor is running in a high temperature environment, the temperature rise of the motor bearings and windings will increase after a long time of operation. In addition, when the ambient temperature is high, the heat generated by the motor itself is difficult to dissipate, causing damage to the insulation material of the motor and affecting the normal operation of the entire system. The temperature rise value of the fan motor must be kept within the allowable range, but the temperature rise value needs to be measured frequently, and the measurement work increases the labor cost.

[0003] Therefore, it is necessary to design a cooling fan with good cooling effect and convenient temperature monitoring to solve the problems existing in the prior art. Summary of the invention

[0004] The object of the present invention is to provide a centrifugal fan with good cooling effect and convenient temperature monitoring, and its specific technical scheme is as follows:

[0005] A centrifugal fan includes a motor, a volute, an impeller, and a health monitoring system;

[0006] The motor is a water-cooled motor; the volute is fixed to the output end of the motor; the impeller is arranged in the volute and is transmission-connected to the output end of the motor; the health monitoring system is arranged on the volute to monitor the temperature and vibration of the motor.

[0007] Preferably, it also includes a motor mounting base for supporting the motor, and the motor is positioned and mounted on the motor mounting base through its base feet; multiple groups of connecting plates are also provided on both sides of the motor mounting base, one end of the connecting plate is connected to the motor mounting base, and the other end is connected to the volute.

[0008] Preferably, the motor is a three-phase AC asynchronous motor; an interlayer is provided in the motor mounting seat and the rear bearing end cover of the motor, a circulating water circuit is arranged in the interlayer, and the circulating water circuit includes a water inlet and a water outlet for cooling the motor.

[0009] Preferably, the volute is positioned and mounted on the front end cover flange of the motor, and the output shaft of the motor is located in the volute; the impeller is pressed onto the output shaft and its axial displacement is limited by a limit assembly.

[0010] Preferably, the limiting assembly comprises a shaft end nut and a stop washer, and the shaft end nut presses the impeller onto the output shaft of the motor via the stop washer.

[0011] Preferably, a porous mesh plate and sound-absorbing cotton are further provided in the volute; the sound-absorbing cotton is filled along the profile line of the volute; the porous mesh plate is fixed to the two side plates of the volute through the mounting ear seat and presses the sound-absorbing cotton;

[0012] The sound-absorbing cotton is filled with multiple layers.

[0013] Preferably, the health monitoring system includes a bearing temperature sensor, a vibration velocity sensor and a wind speed sensor, which are used to monitor the temperature rise and vibration velocity of the motor bearing and the wind speed of the centrifugal fan in real time;

[0014] The bearing temperature sensor includes a rear temperature sensor and a front temperature sensor.

[0015] Preferably, the volute is also provided with an observation window for observing the rotation direction of the impeller in the volute.

[0016] Preferably, an air inlet duct is provided on the air inlet side plate of the volute; the air inlet duct adopts an arc-shaped air inlet design.

[0017] Preferably, the impeller is a centrifugal impeller, the front wheel disc of which is an arc-shaped bell-mouth structure and is sleeved with the air inlet duct, and the blades of the impeller are wing-shaped blades;

[0018] The gap between the impeller and the air inlet is 1 to 4 mm.

[0019] The application of the technical solution of the present invention has the following beneficial effects:

[0020] A centrifugal fan includes a motor, a volute, an impeller and a health monitoring system; the motor is a water-cooled motor; the volute is fixed to the output end of the motor; the impeller is arranged in the volute and is transmission-connected to the output end of the motor; the health monitoring system is arranged on the volute, and is used to monitor the temperature and vibration of the motor. Through the above-mentioned arrangement, the present invention provides a fan that can monitor the health status of the fan operation, which adopts a water-cooled motor so that the fan can operate at a higher ambient temperature, and the temperature rise value of the motor meets the requirement of not exceeding the allowable temperature rise. The health monitoring system further ensures that important performance parameters of the fan, such as the motor temperature and vibration, are kept within the normal range, which helps to increase the life of the fan and ensure smooth operation.

[0021] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural schematic diagram of the centrifugal fan of the present invention;

[0024] Figure 2 for Figure 1 Side view of

[0025] Figure 3 It is a schematic diagram of the installation of the health monitoring system of the present invention;

[0026] Figure 4 for Figure 3 Side view of

[0027] Among them: 1. Motor; 2. Volute; 3. Impeller; 4. Air inlet; 5. Connecting plate; 6. Motor mounting seat; 7. Stop washer; 8. Shaft end nut; 9. Sound-absorbing cotton; 10. Porous mesh plate; 11. Health monitoring system; 12. Observation window; 13. Bearing oil filling pipeline; 14. Wind speed sensor; 15. Rear temperature sensor; 16. Vibration speed sensor; 17. Front temperature sensor; 18. Health monitoring system terminal box. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] refer to Figure 1 and Figure 2 A centrifugal fan comprises a motor 1, a volute 2, an impeller 3 and a health monitoring system 11; the motor 1 is a water-cooled motor; the volute 2 is fixed to the output end of the motor 1; the impeller 3 is arranged in the volute 2 and is transmission-connected to the output end of the motor 1; the health monitoring system 11 is arranged on the volute 2 through a health monitoring system terminal box 18, and is used to monitor the temperature and vibration of the motor 1.

[0030] Through the above configuration, the present invention provides a fan capable of monitoring the health of the fan operation, which uses a water-cooled motor so that the fan can operate at a higher ambient temperature, and the motor temperature rise value does not exceed the allowable temperature rise. The health monitoring system further ensures that important performance parameters such as the motor temperature and vibration of the fan remain within the normal range, which helps to increase the life of the fan and ensure smooth operation.

[0031] The volute adopts the traditional rectangular cross-section form. In order to achieve the requirements of large flow, high pressure and low noise, the volute profile adopts a sandwich design. The outer side is a steel plate closed shell, and the inner profile adopts a porous mesh structure. The sandwich is filled with sound-absorbing cotton. The porous mesh adopts a bolt pipeline type to facilitate future maintenance and replacement of sound-absorbing cotton. The volute is equipped with multiple channel steel or angle steel reinforcement ribs on the motor installation side, and the reinforcement ribs are equipped with multiple cylindrical blind hole nuts for the installation of other auxiliary parts of the cooling system.

[0032] It also includes a motor mounting base 6 for supporting the motor 1. The motor can operate under industrial frequency or variable frequency power supply conditions, and is adapted to a three-phase AC power supply voltage not greater than 380V and a frequency not higher than 50Hz. The motor 1 is positioned and mounted on the motor mounting base 6 through its base; multiple groups of connecting plates 5 are also provided on both sides of the motor mounting base 6, one end of the connecting plate 5 is connected to the motor mounting base 6, and the other end is connected to the volute 2. The motor mounting base is used to ensure that the motor is firmly placed on the ground, and the motor mounting base and the volute are connected by connecting plates. The motor, volute and motor mounting base are all connected to each other in pairs. Connecting the motor mounting base and the volute together strengthens the stability and rigidity of the entire fan, ensures the stability of the connection, and reduces the vibration between the components.

[0033] The motor 1 is a three-phase AC asynchronous motor; the motor mounting seat 6 and the rear bearing end cover of the motor 1 are provided with an interlayer, and a circulating water circuit is arranged in the interlayer. The circulating water circuit includes a water inlet and a water outlet, which is used to cool the motor 1. Through the above arrangement, the circulating water circuit is integrated into the motor mounting seat and the rear bearing end cover, which saves space while ensuring the cooling effect of the motor using water cooling.

[0034] The volute 2 is positioned and installed on the front end cover flange of the motor 1, and the output shaft of the motor 1 is located in the volute; the impeller 3 is pressed onto the output shaft and its axial displacement is limited by the limit assembly. The flange surface of the motor output end is connected to the side plate of the volute by bolts. The flange stop of the motor output end is matched with the clearance of the volute side plate hole, which plays a role in centering the motor and the volute. The motor is equipped with front and rear bearing oiling nozzles, temperature sensors, and vibration speed sensors.

[0035] The limiting assembly includes a shaft end nut 8 and a stop washer 7, and the shaft end nut 8 presses the impeller 3 onto the output shaft of the motor 1 through the stop washer 7. Through the above arrangement, the impeller is installed on the motor output shaft in the volute, and a tapered hole is used between the impeller and the output shaft. The shaft end is provided with a shaft end nut and a stop washer to prevent the impeller from loosening and falling out.

[0036] The volute 2 is also provided with a porous mesh plate 10 and sound-absorbing cotton 9; the sound-absorbing cotton 9 is filled along the profile of the volute 2; the porous mesh plate 10 is fixed to the two side plates of the volute 2 through the mounting ear seat and presses the sound-absorbing cotton 9;

[0037] The sound absorbing cotton 9 is filled with multiple layers. In this embodiment, it is filled with 5 layers.

[0038] refer to Figure 3 and Figure 4 , the health monitoring system 11 includes a bearing temperature sensor, a vibration velocity sensor 16 and a wind speed sensor 14, which are used to monitor the temperature rise and vibration velocity of the bearing of the motor 1 and the wind speed of the centrifugal fan in real time;

[0039] The bearing temperature sensor comprises a rear temperature sensor 15 and a front temperature sensor 17. The bearing temperature sensors 15 and 17 are installed in the radial holes of the motor end cover close to the bearing, and the temperature sensor probe is about 10 mm away from the outer ring of the bearing.

[0040] The vibration velocity sensor is installed on the bottom foot of the motor base, and the vibration velocity sensor is installed with anti-slip screws.

[0041] The fan motor bearing can be either an oil-filled bearing or a maintenance-free bearing. When an oil-filled bearing is used, the bearing can be regularly filled with bearing grease through the bearing oil filling pipeline 13.

[0042] The volute 2 is also provided with an observation window 12 for observing the rotation direction of the impeller 3 in the volute 2. In order to facilitate observation of whether the fan rotation direction is correct after the fan is installed in the system, a transparent impeller rotation direction observation window is provided on the volute. The impeller rotation direction observation window is made of transparent material and installed on the motor side plate of the volute by bolts, and a sealing gasket is installed between the volute and the volute.

[0043] An air inlet duct 4 is provided on the air inlet side plate of the volute 2; the air inlet duct 4 adopts an arc-shaped air inlet design, which can effectively reduce the vortex of the impeller inlet airflow, and the air inlet duct is installed on the air inlet side flange of the volute through a flange, and a hexagonal nut is welded on the inner side of the air inlet side flange of the volute for installing the air inlet duct.

[0044] The impeller 3 is a centrifugal impeller, the front wheel disc of which is an arc-shaped bell-mouth structure and is sleeved with the air inlet 4. The blades of the impeller 3 are wing-shaped blades; the gap between the impeller 3 and the air inlet 4 is 1-4 mm. The impeller is cast with aluminum alloy to meet the lightweight requirements.

[0045] The assembly steps of the centrifugal fan in this embodiment are as follows: first fill the sound-absorbing cotton along the volute profile, press the sound-absorbing cotton with a porous mesh plate, and then fix the mounting ears of the porous mesh plate to the two side plates of the volute by bolts. Install the motor's base to the motor mounting seat and connect and tighten it with bolts and other fasteners. Then, install the volute to the flange of the front end cover of the motor, and screw the bolts into the blind hole threads of the front end cover of the motor on the inside of the volute to connect the volute to the motor. Then press the impeller to the motor shaft extension, and then install the shaft end stop washer and the shaft end nut. Install the air inlet duct on the air inlet side plate of the volute. Then connect the plates on both sides of the motor mounting seat, and the connecting plates are connected to the motor mounting seat and the volute, and the connection method is bolts and the like. Then install the health monitoring system and the bearing oil filling pipeline 13, and finally install the impeller rotation observation window.

[0046] The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways within the spirit and principles of the present invention.

Claims

1. A centrifugal fan, characterized in that: It comprises a motor (1), a volute (2), an impeller (3) and a health monitoring system (11); The motor (1) is a water-cooled motor; the volute (2) is fixed to the output end of the motor (1); the impeller (3) is arranged in the volute (2) and is drivingly connected to the output end of the motor (1); the health monitoring system (11) is arranged on the volute (2) and is used to monitor the temperature and vibration of the motor (1).

2. A centrifugal fan according to claim 1, characterized in that: It also includes a motor mounting seat (6) for supporting the motor (1), the motor (1) being mounted on the motor mounting seat (6) by positioning the motor (1) with its base; a plurality of connecting plates (5) are provided on both sides of the motor mounting seat (6), one end of the connecting plate (5) being connected to the motor mounting seat (6) and the other end being connected to the volute (2).

3. A centrifugal fan according to claim 2, characterized in that: The motor (1) is a three-phase AC asynchronous motor; an interlayer is provided in the motor mounting seat (6) and the rear bearing end cover of the motor (1), a circulating water circuit is arranged in the interlayer, and the circulating water circuit includes a water inlet and a water outlet for cooling the motor (1).

4. A centrifugal fan according to claim 1, characterized in that: The volute (2) is positioned and mounted on the front end cover flange of the motor (1), and the output shaft of the motor (1) is located in the volute; the impeller (3) is pressed onto the output shaft and its axial displacement is limited by a limit assembly.

5. A centrifugal fan according to claim 4, characterized in that: The limiting assembly comprises a shaft end nut (8) and a stop washer (7), and the shaft end nut (8) presses the impeller (3) onto the output shaft of the motor (1) via the stop washer (7).

6. A centrifugal fan according to claim 1, characterized in that: A porous mesh plate (10) and sound-absorbing cotton (9) are also provided in the volute (2); the sound-absorbing cotton (9) is filled along the profile of the volute (2); the porous mesh plate (10) is fixed to the two side plates of the volute (2) through mounting ears and presses the sound-absorbing cotton (9); The sound-absorbing cotton (9) is filled with multiple layers.

7. A centrifugal fan according to claim 1, characterized in that: The health monitoring system (11) comprises a bearing temperature sensor, a vibration speed sensor (16) and a wind speed sensor (14), which are used to monitor the temperature rise and vibration speed of the bearing of the motor (1) and the wind speed of the centrifugal fan in real time; The bearing temperature sensor comprises a rear end temperature sensor (15) and a front end temperature sensor (17).

8. The centrifugal fan according to claim 1, characterized in that: The volute (2) is also provided with an observation window (12) for observing the rotation direction of the impeller (3) in the volute (2).

9. A centrifugal fan according to claim 1, characterized in that: An air inlet duct (4) is provided on the air inlet side plate of the volute (2); the air inlet duct (4) adopts an arc-shaped air inlet design.

10. A centrifugal fan according to claim 9, characterized in that: The impeller (3) is a centrifugal impeller, the front wheel disc of which is an arc-shaped bell-mouth structure and is sleeved with the air inlet duct (4), and the blades of the impeller (3) are wing-shaped blades; The gap between the impeller (3) and the air inlet duct (4) is 1 to 4 mm.

Images