Shockproof induced draft fan for boiler

Abstract

The shockproof induced draft fan for the boiler comprises a bottom bearing frame, one side of the interior of a fan shell is movably connected with a fan impeller, one side of the top of a motor bearing table is provided with a water cooling bearing seat, and the other side of the top of the motor bearing table is provided with a driving motor. Supporting assemblies for preventing the draught fan from vibrating are arranged at the four corners of the top end of the bottom bearing frame. According to the shockproof induced draft fan for the boiler, by arranging the small electric cylinder, the guide steel pipe, the pressure sensor and the corner base plate, when the shockproof induced draft fan is used, the small electric cylinder extends downwards to push the corner base plate to move downwards along the guide steel pipe, the corner base plate abuts against the ground and forms upward counter-acting force, and the pressure sensor senses the pressure below; if the stress conditions of the four groups of pressure sensors are the same, the equipment is in a balanced state, the function of supporting the equipment to prevent vibration is realized, and the problem that the device does not have the function of supporting the equipment to prevent vibration is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of induced draft fans, in particular to a shockproof induced draft fan for a boiler. Background Art

[0002] The induced draft fan generates negative pressure through the rotation of the impeller, and then draws air from the equipment. It is generally installed at the tail end of the boiler to extract the hot flue gas in the furnace and maintain the negative pressure of the boiler.

[0003] At present, the common boiler induced draft fans on the market are mostly similar in structure, with the fan casing, internal impeller and drive motor as the main components. The drive motor drives the impeller to rotate through the shaft, generates negative pressure inside the fan casing, and sucks out the pre-treated flue gas. There are some functional deficiencies in actual use and there is room for improvement. For example, the equipment is generally installed in the boiler room. The boiler room is exposed to high temperature for a long time, and the cement-poured floor is prone to slight ups and downs due to thermal expansion and contraction. The fan is prone to vibration during operation. Coupled with the uneven ground, the vibration amplitude will be amplified, causing the connection between the fan and the boiler to loosen. The current conventional solution is to find a suspended position at the bottom of the equipment and raise it by inserting wooden wedges and other items. As the equipment is used, wooden wedges and other objects are easily discharged, and perfectly matched items for raising the height are also difficult to find, and it does not have the function of supporting the equipment to prevent vibration.

[0004] Now, a new type of shockproof induced draft fan for boiler is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a vibration-proof induced draft fan for a boiler, so as to solve the problem that the above-mentioned background technology has no function of supporting equipment to prevent vibration.

[0006] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a shockproof induced draft fan for a boiler, comprising a bottom bearing frame, one side of the top of the bottom bearing frame is fixedly connected to a motor bearing platform, the other side of the top of the bottom bearing frame is fixedly connected to a fan casing, an air inlet is fixedly connected to the middle position of one side of the fan casing, a fan impeller is movably connected to one side of the interior of the fan casing, an air outlet pipe is arranged at the top of the fan casing, a mounting flange is welded to the front end of the air outlet pipe, four groups of flange screw eyes are arranged inside the mounting flange, a water-cooled bearing seat is installed on one side of the top of the motor bearing platform, a transmission shaft is movably connected to the interior of the water-cooled bearing seat, a driving motor is installed on the other side of the top of the motor bearing platform, and support components to prevent the fan from vibrating are arranged at the four corners of the top of the bottom bearing frame.

[0007] The support assembly includes four groups of small electric cylinders, which are respectively installed at the four corners of the top of the bottom supporting frame. The four corners of the bottom end of the bottom supporting frame are respectively fixedly connected to the inside with guide steel pipes, and the inside of the guide steel pipes is provided with corner pads, and the top of the corner pads is installed with pressure sensors.

[0008] Preferably, the small electric cylinder is symmetrically distributed about the vertical center line of the bottom supporting frame, and the bottom end of the small electric cylinder extends downward into the interior of the guide steel pipe.

[0009] Preferably, the bottom end of the small electric cylinder is connected to the top end of the pressure sensor, and the guide steel pipe passes through the upper and lower ends of the bottom supporting frame.

[0010] Preferably, the outer diameter of the corner pad is consistent with the inner diameter of the guide steel pipe, and the corner pad can slide up and down along the inside of the guide steel pipe.

[0011] Preferably, a guide tube is inserted at the front end of the air outlet pipe, a flange docking ring is welded at the middle position outside the guide tube, a front high-temperature resistant rubber sealing ring is glued to the front end of the flange docking ring, and a rear high-temperature resistant rubber sealing ring is glued to the rear end of the flange docking ring.

[0012] Preferably, four groups of reserved eyes are arranged inside the flange docking ring, the outer diameter of the guide tube is consistent with the inner diameter of the air outlet pipe, and the outer wall of the guide tube is tightly fitted with the inner wall of the air outlet pipe.

[0013] Preferably, a concave frame is provided at the front end of the motor support platform, a digital display screen is installed at the front end of the concave frame, and an infrared temperature sensor is installed at the front end inside the concave frame.

[0014] Preferably, fixing plates are welded to the upper and lower ends of the rear of the concave frame respectively, and two sets of fixing screws are inserted into the front end of the fixing plate, and the digital display screen and the infrared temperature sensor are electrically connected.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the anti-vibration induced draft fan for the boiler not only realizes the function of supporting the equipment to prevent vibration, but also realizes the function of sealing and preventing leakage at the smoke exhaust position, and also realizes the function of monitoring the fan temperature;

[0016] (1) By setting up a small electric cylinder, a guide steel pipe, a pressure sensor and a corner pad, when in use, the air inlet and the tail end of the boiler are connected, and the driving motor drives the fan impeller to rotate at high speed through the transmission shaft to generate negative pressure, and the high-temperature flue gas passing through the air preheater and the electrostatic precipitator is sucked into the fan casing from the air inlet, and then discharged to the desulfurization system through the outlet pipe. During the operation of the equipment, the small electric cylinder extends downward, pushing the corner pad to move downward along the guide steel pipe. The corner pad is pressed against the ground and forms an upward reaction force. The pressure sensor senses the pressure below. When the four groups of pressure sensors reach the preset fixed value, the corresponding small electric cylinder stops extending. At this time, the four groups of pressure sensors are subjected to the same force, which means that the equipment is in a balanced state, which can reduce the occurrence of equipment vibration and realize the function of supporting the equipment to prevent vibration;

[0017] (2) By providing a flange docking ring, a front high-temperature resistant rubber sealing ring, a rear high-temperature resistant rubber sealing ring, a guide tube and a reserved eye, when in use, the air outlet pipe and the smoke inlet of the desulfurization system are docked, one end of the guide tube is inserted into the air outlet pipe, and the other end is inserted into the smoke inlet of the desulfurization system. The back of the flange docking ring fits with the installation flange of the air outlet port, and the front of the flange docking ring fits with the smoke inlet flange of the desulfurization system. As the bolts are driven in and locked from the flange screw eyes and the reserved eyes, the front high-temperature resistant rubber sealing ring and the rear high-temperature resistant rubber sealing ring are tightly attached to the front and rear flanges, thereby increasing the sealing of the joint position. The smoke passes through the guide tube, which can reduce the probability of leakage, thereby realizing the function of sealing and preventing leakage at the smoke exhaust position;

[0018] (3) By providing a concave frame, a digital display screen, an infrared temperature sensor, a fixing plate and fixing screws, when in use, the high-temperature flue gas enters the fan casing through the air inlet, and the temperature of the fan casing itself will rise rapidly. The infrared temperature sensor on the concave frame keeps monitoring the surface temperature of the fan casing and feeds back the value on the digital display screen, which is convenient for the staff to check. The temperature of the flue gas can be judged by the temperature of the fan casing, and then the operation status of the boiler can be understood. The fixing plate and fixing screws provide physical support for the installation and fixation of the concave frame, realizing the function of fan temperature monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a partial cross-sectional structure of the utility model in a front view;

[0020] Figure 2 It is a side-view enlarged structural schematic diagram of the guide tube of the utility model;

[0021] Figure 3 For the utility model Figure 1 A partial cross-section at the center is an enlarged structural diagram;

[0022] Figure 4 It is a schematic diagram of an enlarged side view of the concave frame of the utility model.

[0023] In the figure: 1. Bottom bearing frame; 2. Motor bearing platform; 3. Fan casing; 4. Small electric cylinder; 5. Guide steel pipe; 6. Pressure sensor; 7. Corner pad; 8. Air inlet; 9. Fan impeller; 10. Air outlet duct; 11. Mounting flange; 12. Flange screw eye; 13. Flange docking ring; 14. Front high-temperature resistant rubber sealing ring; 15. Rear high-temperature resistant rubber sealing ring; 16. Guide cylinder; 17. Reserved eye; 18. Transmission shaft; 19. Water-cooled bearing seat; 20. Drive motor; 21. Concave frame; 22. Digital display screen; 23. Infrared temperature sensor; 24. Fixing plate; 25. Fixing screw. DETAILED DESCRIPTION

[0024] 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.

[0025] Example 1: Please refer to Figure 1-4 , a shockproof induced draft fan for a boiler, comprising a bottom bearing frame 1, one side of the top of the bottom bearing frame 1 is fixedly connected to a motor bearing platform 2, the other side of the top of the bottom bearing frame 1 is fixedly connected to a fan casing 3, an air inlet 8 is fixedly connected to the middle position of one side of the fan casing 3, a fan impeller 9 is movably connected to one side of the inside of the fan casing 3, an air outlet pipe 10 is arranged at the top of the fan casing 3, a mounting flange 11 is welded to the front end of the air outlet pipe 10, four groups of flange screw eyes 12 are arranged inside the mounting flange 11, a water-cooled bearing seat 19 is installed on one side of the top of the motor bearing platform 2, a transmission shaft 18 is movably connected to the inside of the water-cooled bearing seat 19, a driving motor 20 is installed on the other side of the top of the motor bearing platform 2, and support components for preventing the fan from vibrating are arranged at the four corners of the top of the bottom bearing frame 1;

[0026] See also Figure 1-4 A shockproof induced draft fan for a boiler also includes a support assembly, which includes four groups of small electric cylinders 4, which are respectively installed at the four corners of the top of the bottom support frame 1, and the insides of the four corners of the bottom end of the bottom support frame 1 are respectively fixedly connected with guide steel pipes 5, and the inside of the guide steel pipes 5 is provided with corner pads 7, and the top of the corner pads 7 is installed with a pressure sensor 6;

[0027] The small electric cylinder 4 is symmetrically distributed about the vertical center line of the bottom bearing frame 1. The bottom end of the small electric cylinder 4 extends downward into the interior of the guide steel pipe 5. The bottom end of the small electric cylinder 4 is connected to the top end of the pressure sensor 6. The guide steel pipe 5 passes through the upper and lower ends of the bottom bearing frame 1. The outer diameter of the corner pad 7 is consistent with the inner diameter of the guide steel pipe 5. The corner pad 7 can slide up and down along the interior of the guide steel pipe 5, which can keep the equipment balanced and reduce the generation of vibration.

[0028] Specifically, Figure 1 and Figure 3 As shown, the small electric cylinder 4 extends downward, pushing the corner pad 7 to move downward along the guide steel pipe 5. The corner pad 7 presses against the ground and forms an upward reaction force. The pressure sensor 6 senses the pressure below. When the four groups of pressure sensors 6 reach the preset fixed value, the corresponding small electric cylinder 4 stops extending. At this time, the four groups of pressure sensors 6 are subjected to the same force, which indicates that the equipment is in a balanced state, and the occurrence of equipment vibration can be reduced.

[0029] Embodiment 2: A guide tube 16 is inserted at the front end of the air outlet pipe 10, a flange docking ring 13 is welded at the middle position of the outside of the guide tube 16, a front high-temperature resistant rubber sealing ring 14 is glued to the front end of the flange docking ring 13, and a rear high-temperature resistant rubber sealing ring 15 is glued to the rear end of the flange docking ring 13. Four groups of reserved eyes 17 are arranged inside the flange docking ring 13. The outer diameter of the guide tube 16 is consistent with the inner diameter of the air outlet pipe 10. The outer wall of the guide tube 16 and the inner wall of the air outlet pipe 10 are tightly fitted, which can increase the sealing of the docking position and reduce the leakage of smoke;

[0030] Specifically, Figure 1 and Figure 2 As shown, one end of the guide tube 16 is inserted into the air outlet pipe 10, and the other end is inserted into the smoke inlet of the desulfurization system. The back of the flange docking ring 13 is in contact with the mounting flange 11 at the end of the air outlet pipe 10, and the front is docked with the smoke inlet flange of the desulfurization system. As the bolts are driven in and locked from the flange screw eyes 12 and the reserved eyes 17, the front high-temperature resistant rubber sealing ring 14 and the rear high-temperature resistant rubber sealing ring 15 are tightly attached to the front and rear flanges to increase the sealing of the joint position. The smoke passes through the guide tube 16, which can reduce the chance of leakage.

[0031] Embodiment 3: A concave frame 21 is provided at the front end of the motor bearing platform 2, a digital display screen 22 is installed at the front end of the concave frame 21, an infrared temperature sensor 23 is installed at the front end of the concave frame 21, and fixing plates 24 are welded at the upper and lower ends of the back of the concave frame 21, and two sets of fixing screws 25 are plugged at the front end of the fixing plate 24. The digital display screen 22 and the infrared temperature sensor 23 are electrically connected, which can monitor the temperature of the fan in real time and provide data support for the staff to make judgments;

[0032] Specifically, Figure 1and Figure 4 As shown, the infrared temperature sensor 23 on the concave frame 21 keeps monitoring the surface temperature of the fan casing 3 and feeds back the value on the digital display screen 22, which is convenient for the staff to check. The temperature of the flue gas can be judged by the temperature of the fan casing 3, and then the operation status of the boiler can be understood. The fixing plate 24 and the fixing screw 25 provide physical support for the installation and fixation of the concave frame 21.

[0033] Working principle: When the utility model is in use, first, the air inlet 8 is connected to the rear end of the boiler, and the driving motor 20 drives the fan impeller 9 to rotate at high speed through the transmission shaft 18 to generate negative pressure, and the high-temperature flue gas passing through the air preheater and the electrostatic precipitator is sucked into the fan casing 3 from the air inlet 8, and then discharged to the desulfurization system through the air outlet pipe 10. During the operation of the equipment, the small electric cylinder 4 extends downward, pushing the corner pad 7 to move downward along the guide steel pipe 5. The corner pad 7 is pressed against the ground and forms an upward reaction force. The pressure sensor 6 senses the pressure below. When the four groups of pressure sensors 6 reach the preset fixed value, the corresponding small electric cylinder 4 stops extending. At this time, the force conditions of the four groups of pressure sensors 6 are the same, which means that the equipment is in a balanced state, which can reduce the occurrence of equipment vibration. The air outlet pipe 10 is connected to the smoke inlet of the desulfurization system, one end of the guide tube 16 is inserted into the air outlet pipe 10, and the other end is inserted into the smoke inlet of the desulfurization system. The back of the flange docking ring 13 is in contact with the mounting flange 11 at the end of the air outlet pipe 10, and the front thereof is connected to the smoke inlet flange of the desulfurization system. As the bolts are driven in and locked from the flange screw eyes 12 and the reserved eyes 17, the front high-temperature resistant rubber sealing ring 14 and the rear high-temperature resistant rubber sealing ring 15 are tightly attached to the front and rear flanges to increase the sealing of the joint position. The smoke passes through the guide tube 16, which can reduce the chance of leakage. The high-temperature flue gas enters the fan casing 3 through the air inlet 8, and the temperature of the fan casing 3 itself will rise rapidly. The infrared temperature sensor 23 on the concave frame 21 keeps monitoring the surface temperature of the fan casing 3 and feeds back the value on the digital display screen 22, which is convenient for the staff to check. The temperature of the flue gas can be judged by the temperature of the fan casing 3, and then the operation status of the boiler can be understood. The fixing plate 24 and the fixing screw 25 provide physical support for the installation and fixation of the concave frame 21.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A shockproof induced draft fan for a boiler, comprising a bottom bearing frame (1), characterized in that: One side of the top of the bottom bearing frame (1) is fixedly connected to a motor bearing platform (2), the other side of the top of the bottom bearing frame (1) is fixedly connected to a fan casing (3), an air inlet (8) is fixedly connected at the middle position of one side of the fan casing (3), one side of the inside of the fan casing (3) is movably connected to a fan impeller (9), an air outlet pipe (10) is arranged at the top of the fan casing (3), a mounting flange (11) is welded to the front end of the air outlet pipe (10), four groups of flange screw eyes (12) are arranged inside the mounting flange (11), a water-cooled bearing seat (19) is installed on one side of the top of the motor bearing platform (2), a transmission shaft (18) is movably connected to the inside of the water-cooled bearing seat (19), a driving motor (20) is installed on the other side of the top of the motor bearing platform (2), and support components for preventing the fan from vibrating are arranged at the four corners of the top of the bottom bearing frame (1); The support assembly comprises four groups of small electric cylinders (4), which are respectively mounted at four corners of the top of the bottom support frame (1), and the inside of the four corners of the bottom of the bottom support frame (1) are respectively fixedly connected with guide steel pipes (5), and the inside of the guide steel pipes (5) is provided with corner pads (7), and the top of the corner pads (7) is installed with pressure sensors (6).

2. The shockproof induced draft fan for a boiler according to claim 1, characterized in that: The small electric cylinder (4) is symmetrically distributed about the vertical center line of the bottom supporting frame (1), and the bottom end of the small electric cylinder (4) extends downward into the interior of the guide steel pipe (5).

3. The anti-vibration induced draft fan for a boiler according to claim 1, characterized in that: The bottom end of the small electric cylinder (4) is connected to the top end of the pressure sensor (6), and the guide steel pipe (5) passes through the upper and lower ends of the bottom support frame (1).

4. The anti-vibration induced draft fan for a boiler according to claim 1, characterized in that: The outer diameter of the corner pad (7) is consistent with the inner diameter of the guide steel pipe (5), and the corner pad (7) can slide up and down along the inside of the guide steel pipe (5).

5. The anti-vibration induced draft fan for a boiler according to claim 1, characterized in that: A guide tube (16) is inserted at the front end of the air outlet pipe (10), a flange butt ring (13) is welded at the middle position outside the guide tube (16), a front high-temperature resistant rubber sealing ring (14) is glued to the front end of the flange butt ring (13), and a rear high-temperature resistant rubber sealing ring (15) is glued to the rear end of the flange butt ring (13).

6. The shockproof induced draft fan for a boiler according to claim 5, characterized in that: Four groups of reserved holes (17) are arranged inside the flange docking ring (13); the outer diameter of the guide tube (16) is consistent with the inner diameter of the air outlet pipe (10); and the outer wall of the guide tube (16) is tightly fitted with the inner wall of the air outlet pipe (10).

7. The anti-vibration induced draft fan for a boiler according to claim 1, characterized in that: The front end of the motor bearing platform (2) is provided with a concave frame (21), the front end of the concave frame (21) is installed with a digital display screen (22), and the front end inside the concave frame (21) is installed with an infrared temperature sensor (23).

8. The shockproof induced draft fan for a boiler according to claim 7, characterized in that: The upper and lower ends of the back of the concave frame (21) are respectively welded with fixing plates (24), and the front end of the fixing plate (24) is plugged with two sets of fixing screws (25), and the digital display screen (22) and the infrared temperature sensor (23) are electrically connected.

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