An inlet bypass device for a forced draft fan of a thermal power plant

Abstract

The application belongs to the technical field of thermal power plant production, and particularly relates to a bypass device for the inlet of a blower of a thermal power plant, which comprises a casing, an air outlet end head is integrally arranged at the end of the casing, an impeller assembly is arranged in the casing and the air outlet end head, an air inlet pipe is fixedly arranged at the air inlet end of the casing, a capillary tube is fixedly inserted into the side wall of the air inlet pipe, an oil box is fixedly arranged at the upper end of the casing, a piston plate is slidably arranged in the oil box, two springs are arranged between the upper end of the piston plate and the upper inner wall of the oil box, and an oil overflow pipe is fixedly inserted into the side wall of the oil box and the side wall of the casing. The bypass device can push lubricating oil to automatically overflow and lubricate the impeller assembly based on the air supply amount generated during each operation of the blower, effectively reduces mechanical wear, prolongs the service life of the impeller assembly, and automatically triggers oil supplementing without frequent maintenance and repair by personnel, and is convenient to use.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of thermal power plant production, and particularly relates to a bypass device for the inlet of a blower of a thermal power plant. BACKGROUND

[0002] A power plant refers to a power plant that converts a certain form of original energy into electric energy for fixed facilities or transportation power supply. Common power plants use coal as fuel to generate heat energy. The blower in the thermal power plant generally includes a blower, a primary air blower, an induced draft fan, a desulfurization booster fan and a ventilator.

[0003] The blower in the thermal power plant plays an important role. It mainly provides secondary air. After passing through the air preheater, part of the air is provided to the burner to provide perimeter air, sandwiched air and the like, and has an influence on the flame at the burner, and can cool the burner. Another part provides the oxygen required for the boiler combustion. Finally, a part provides SOFA and COFA air to adjust the combustion. Since the air source of the blower is generally hot air from the tail flue of the boiler, heat energy waste can be reduced, but the performance requirements of the blower are also relatively high. The driving part of the blower is driven by the driving rod to rotate the impeller. Due to high temperature and continuous work, the wear at the joint between the driving rod and the driving part will become more and more serious, the service life is relatively low, and daily maintenance is required to ensure the service life of the blower. However, since the blower is installed between the air preheater and the tail flue of the boiler, maintenance is relatively inconvenient, and can only be carried out when the power plant stops running, which is greatly limited. SUMMARY

[0004] The purpose of the present application is to solve the above problems, and provide a bypass device for the inlet of a blower of a thermal power plant.

[0005] In order to achieve the above purpose, the following technical scheme is adopted:

[0006] A bypass device for the inlet of a blower of a thermal power plant, comprising a casing, an air outlet end head is integrally arranged at one end of the casing, an impeller assembly is arranged in the casing and the air outlet end head, an air inlet pipe is fixedly arranged at the air inlet end of the casing, a capillary tube is fixedly inserted in the side wall of the air inlet pipe, an oil box is fixedly arranged at the upper end of the casing, a piston plate is slidably arranged in the oil box, two springs are arranged between the upper end of the piston plate and the upper inner wall of the oil box, an oil overflow pipe is fixedly inserted in the side wall of the oil box and the side wall of the casing, an oil distribution assembly matched with the impeller assembly is connected to the oil outlet end of the oil overflow pipe, an oil supplement pipe is fixedly inserted in the side wall of the oil box, an oil supplement pressure valve is arranged in the oil supplement pipe, and a reset mechanism is connected between the piston plate and the oil box.

[0007] Preferably, the impeller assembly comprises a mounting frame fixedly arranged inside the casing, a side wall of the mounting frame is rotationally provided with a driving rod, a rod end of the driving rod is fixedly sleeved with a blower impeller inside one side of the air outlet end, a side wall of the mounting frame is fixedly provided with a driving motor, and an output end of the driving motor is connected with the driving rod.

[0008] Preferably, the oil distribution assembly comprises a connecting pipe fixedly sleeved with the oil overflow pipe, and two pipe ends of the connecting pipe are sealingly arranged, a plurality of oil dripping pipes are fixedly arranged at a lower end of a pipe wall of the connecting pipe.

[0009] Preferably, the reset mechanism comprises a hollow insulating block fixedly arranged at an upper end of the oil box, an insulating piston is slidingly arranged inside the hollow insulating block, a first magnetic block is fixedly arranged at a lower end of the insulating piston, a conductive block is fixedly arranged at an upper end of the insulating piston and an upper inner wall of the hollow insulating block, a second magnetic block is fixedly arranged at a lower end of the piston plate, and an electromagnet connected with the conductive block is fixedly arranged at a bottom of the oil box.

[0010] Preferably, the air inlet end of the capillary tube is fixedly inserted with a wind collecting block, an air inlet groove is arranged at one side of the air inlet end of the casing, and the capillary tube is arranged in communication with the air inlet groove.

[0011] Preferably, the connecting pipe is arranged in an inclined manner, and a pipe end of the connecting pipe located at one side of the air inlet end of the casing is arranged lower than the other pipe end.

[0012] Preferably, the air inlet end of the air inlet groove is fixedly provided with a dust filter screen.

[0013] Preferably, an inner diameter of the air outlet end of the capillary tube is greater than an inner diameter of the air inlet end, the air outlet end of the capillary tube is provided with a one-way valve, an air outlet pipe is fixedly inserted at a lower end of a side wall of the oil box, and the air outlet pipe is provided with an air outlet pressure valve inside.

[0014] Preferably, a blocking frame is fixedly arranged at a lower side inside the oil box, and the blocking frame is arranged below the piston plate.

[0015] Compared with the prior art, the fire power plant air blower inlet bypass device has the following advantages:

[0016] 1. The casing, the air outlet end, the impeller assembly and the air inlet pipe are arranged in cooperation, so that the device can be used as an air blower of a fire power plant, the capillary tube, the oil box, the piston plate, the spring, the oil overflow pipe and the oil supplement pipe are arranged in cooperation, so that the generated air supply amount during each operation of the air blower can drive the lubricating oil to automatically overflow and lubricate and maintain the impeller assembly, thereby reducing mechanical wear, prolonging the service life of the impeller assembly, and avoiding frequent maintenance and repair by personnel, and the device is convenient to use.

[0017] 2. The reset mechanism can generate an instantaneous electromagnetic attraction after the oil is discharged, which, together with the spring, causes the piston plate to move down and reset, thereby generating negative pressure and enabling the oil replenishment pressure valve of the oil replenishment pipe to automatically replenish oil, further improving the convenience of use. Attached Figure Description

[0018] Fig. 1 This is a schematic diagram of the structure of a bypass device for the inlet of a thermal power plant blower provided by the present invention;

[0019] Fig. 2 This is an enlarged view of part A of the structure of the bypass device for the inlet of a thermal power plant blower provided by the present invention;

[0020] Fig. 3 This is a schematic diagram of the internal structure of the hollow insulating block of a bypass device for the inlet of a thermal power plant blower, provided by the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Housing; 2. Air outlet; 3. Air inlet pipe; 4. Capillary tube; 5. Oil box; 6. Piston plate; 7. Spring; 8. Oil overflow pipe; 9. Oil replenishment pipe; 10. Mounting bracket; 11. Drive rod; 12. Air supply impeller; 13. Drive motor; 14. Connecting pipe; 15. Oil drip pipe; 16. Hollow insulating block; 17. Insulating piston; 18. First magnetic block; 19. Conductive block; 20. Second magnetic block; 21. Electromagnet; 22. Air collecting block; 23. Air inlet slot; 24. Dust filter; 25. Air outlet pipe; 26. Baffle frame. Detailed Implementation

[0023] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0024] like Figs. 1-3 As shown, a bypass device for the inlet of a thermal power plant blower includes a housing 1. An air outlet 2 is integrally provided at the end of the housing 1. An impeller assembly is provided inside the air outlet 2 and the housing 1. An air inlet pipe 3 is fixedly provided at the air inlet end of the housing 1. A capillary tube 4 is fixedly inserted into the side wall of the air inlet pipe 3. An oil box 5 is fixedly provided at the upper end of the housing 1. A piston plate 6 is slidably provided inside the oil box 5. Two springs 7 are provided between the upper end of the piston plate 6 and the upper inner wall of the oil box 5. An oil overflow pipe 8 is fixedly inserted into the upper side wall of the oil box 5 and the side wall of the housing 1. An oil distribution assembly that cooperates with the impeller assembly is connected to the oil outlet end of the oil overflow pipe 8. An oil replenishment pipe 9 is fixedly inserted into the upper side wall of the oil box 5. An oil replenishment pressure valve is provided inside the oil replenishment pipe 9. A reset mechanism is connected to the piston and the oil box 5.

[0025] The impeller assembly comprises a mounting frame 10 fixedly arranged in the inside of the casing 1, a driving rod 11 rotatably arranged on the side wall of the mounting frame 10, a blower impeller 12 fixedly sleeved on the rod end of the driving rod 11 and located in the inside of the air outlet end 2, a driving motor 13 fixedly arranged on the side wall of the mounting frame 10 and connected with the driving rod 11, and the driving motor 13 can drive the blower impeller 12 to rotate through the driving rod 11, so that the air supply work can be completed.

[0026] The oil dripping assembly comprises a connecting pipe 14 fixedly sleeved on the pipe end of the oil overflow pipe 8, both pipe ends of the connecting pipe 14 are sealingly arranged, a plurality of oil dripping pipes 15 are fixedly arranged on the pipe wall lower end of the connecting pipe 14, and the overflow oil can drip along the plurality of oil dripping pipes 15 through the connecting pipe 14.

[0027] The reset mechanism comprises a hollow insulating block 16 fixedly arranged on the upper end of the oil box 5, an insulating piston 17 slidingly arranged in the inside of the hollow insulating block 16, a first magnetic block 18 fixedly arranged on the lower end of the insulating piston 17, electrically conductive blocks 19 fixedly arranged on the upper end of the insulating piston 17 and the upper inner wall of the hollow insulating block 16, a second magnetic block 20 fixedly arranged on the lower end of the piston plate 6, and an electromagnet 21 fixedly arranged on the bottom of the oil box 5 and connected with the electrically conductive blocks 19, when the piston plate 6 moves to the upper position in the inside of the oil box 5, the first magnetic block 18 can push the second magnetic block 20 to move upwardly to drive the insulating piston 17 to move upwardly under the action of the same polarity repulsion, until the two electrically conductive blocks 19 are in contact, the electromagnet 21 can be energized, so that the magnetic attraction force can be generated, the first magnetic block 18 can be attracted to move downwardly under the action of the magnetic attraction force, so that the piston plate 6 can be quickly moved downwardly to reset in cooperation with the spring 7, the negative pressure environment in the inside of the oil box 5 is formed, the oil supplement pressure valve can be automatically opened to supplement oil under the action of the negative pressure, and the second magnetic block 20 can be moved downwardly to reset under the action of the gravity of the insulating piston 17 and the electrically conductive blocks 19 along with the downward movement of the first magnetic block 18.

[0028] The air inlet end of the capillary tube 4 is fixedly inserted with a wind collecting block 22, the wind collecting block 22 is arranged on one side of the air inlet end of the casing 1 and is provided with an air inlet groove 23, and the capillary tube 4 is in communication with the air inlet groove 23, so that the wind flow can be blocked and guided through the wind collecting block 22, so that the wind flow can normally enter the inside of the capillary tube 4.

[0029] The connecting pipe 14 is arranged in an inclined manner, and the pipe end of the connecting pipe 14 located on one side of the air inlet end of the casing 1 is arranged lower than the other pipe end, so that the wind flow can prevent the dripped oil from being blown away.

[0030] The air inlet end of the air inlet groove 23 is fixedly provided with a dust filter screen 24, so that the dust particles in the air can be prevented from blocking the capillary tube 4.

[0031] The air outlet end of the capillary tube 4 is larger than the air inlet end, and the air outlet end of the capillary tube is provided with a one-way valve. The air outlet pipe 25 is fixedly connected to the lower end of the side wall of the oil box 5. The air outlet pipe 25 is provided with an air outlet pressure valve. Through the above arrangement, the air in the oil box 5 can be discharged when the piston plate 6 is reset.

[0032] The lower side of the oil box 5 is fixedly provided with a blocking frame 26, which is located below the piston plate 6. Through the above arrangement, the piston plate 6 can be blocked and limited.

[0033] The operation principle of the present application is described as follows: the casing 1 is installed at the tail gas flue of the boiler, and the air outlet end 2 is connected to the air inlet end of the air preheater. At this time, the driving motor 3 is driven to work, so that the driving top rod 11 drives the air blower 12 to rotate, and the air supply work is completed. During air supply, part of the air flow enters the oil box 5 through the capillary tube 4. With the increase of the air pressure in the oil box 5, the piston plate 6 is pushed to move upwards, so that the lubricating oil above the piston plate 6 is pushed to move upwards, and then the lubricating oil is gradually discharged through the oil overflow pipe 8, and then dripped into the impeller assembly through the connecting pipe 14 and the oil dripping pipe 15, so that the lubricating oil in the impeller assembly is automatically added, and the mechanical wear is reduced.

[0034] The above description is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An inlet bypass arrangement for a forced draft fan of a fossil fuel power plant, characterized by, The utility model provides an air supply device, including the shell (1), the end of shell (1) is integrally provided with the air outlet end (2), the air outlet end (2) and the inside of shell (1) are equipped with impeller subassembly together, the air inlet end of shell (1) is fixedly provided with air inlet pipe (3), the lateral wall of air inlet pipe (3) is fixedly inserted with capillary tube (4), the upper end of shell (1) is fixedly provided with oil box (5), the inside of oil box (5) is slidably provided with piston plate (6), the upper end of piston plate (6) and the upper inner wall of oil box (5) are equipped with two springs (7) together, the lateral wall upper end of oil box (5) and the lateral wall of shell (1) are fixedly inserted with overflow pipe (8) together, the oil outlet end of overflow pipe (8) is connected with the oil distribution subassembly matched with impeller subassembly, the lateral wall upper end of oil box (5) is fixedly inserted with oil supplement pipe (9), and the piston is connected with reset mechanism together with oil box (5). The impeller subassembly includes a mounting frame (10) fixedly arranged in the inside of the shell (1), a drive rod (11) rotatably arranged on the lateral wall of the mounting frame (10), a blower impeller (12) fixedly sleeved on the rod end of the drive rod (11) and located on one side in the inside of the air outlet end (2), a drive motor (13) fixedly arranged on the lateral wall of the mounting frame (10), and an output end of the drive motor (13) connected with the drive rod (11). The oil distribution subassembly includes a connecting pipe (14) fixedly sleeved on the pipe end of the overflow pipe (8), and both pipe ends of the connecting pipe (14) are sealingly arranged. The reset mechanism includes a hollow insulating block (16) fixedly arranged on the upper end of the oil box (5), an insulating piston (17) slidably arranged in the inside of the hollow insulating block (16), a first magnetic block (18) fixedly arranged on the lower end of the insulating piston (17), an electrically-conductive block (19) fixedly arranged on the upper end of the insulating piston (17) and the upper inner wall of the hollow insulating block (16), a second magnetic block (20) fixedly arranged on the lower end of the piston plate (6), and an electromagnet (21) fixedly arranged on the bottom of the oil box (5) and connected with the electrically-conductive block (19).

2. A fossil fuel power plant forced draft fan inlet bypass arrangement according to claim 1, characterized in that, The inside of the oil supplement pipe (9) is provided with an oil supplement pressure valve.

3. A fossil fuel power plant forced draft fan inlet bypass arrangement according to claim 1, characterized in that, The connecting pipe (14) is obliquely arranged, and the pipe end of the connecting pipe (14) located on one side of the air inlet end of the shell (1) is arranged lower than the other pipe end.

4. A fossil fuel power plant forced draft fan inlet bypass arrangement according to claim 1, characterized in that, The air inlet end of the capillary tube (4) is fixedly inserted with a wind collecting block (22), the wind collecting block (22) is provided with an air inlet groove (23) on one side of the air inlet end of the shell (1), and the capillary tube (4) is in communication with the air inlet groove (23).

5. A fossil fuel power plant forced draft fan inlet bypass arrangement according to claim 4, characterised in that, The inside of the air inlet end of the air inlet groove (23) is fixedly provided with a dust filter screen (24).

6. A fossil fuel power plant forced draft fan inlet bypass arrangement according to claim 1 wherein, The inside diameter of the air outlet end of the capillary tube (4) is larger than the inside diameter of the air inlet end, the air outlet end of the capillary tube (4) is provided with a one-way valve, the lower end of the lateral wall of the oil box (5) is fixedly inserted with an air outlet pipe (25), and the inside of the air outlet pipe (25) is provided with an air outlet pressure valve.

7. A fossil fuel power plant forced draft fan inlet bypass arrangement according to claim 1 wherein, The inside of the oil box (5) is fixedly provided with a blocking frame (26) on the lower side, and the blocking frame (26) is arranged below the piston plate (6).

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