Boiler exhaust fan and method of using the same

Abstract

The present invention relates to the field of boiler tail gas exhaust fans, specifically a boiler tail gas exhaust fan, comprising a tail gas exhaust pipe, the right end of the tail gas exhaust pipe is fixedly connected to a waste heat recovery pipe, the right end of the waste heat recovery pipe is fixedly connected to a fan cover, and the middle part of the inner wall of the fan cover is fixedly connected to a bracket. The boiler tail gas exhaust fan and its use method are composed of a water diversion mechanism and a cleaning mechanism. When the support pipe rotates with the fan blade to discharge the boiler tail gas, the connecting rod on the side wall of the main support sleeve on the fan blade rotates synchronously with the roller. When the roller rotates to the inside of the guide groove on the arc guide plate, the connecting rod pulls the main support sleeve and moves from the support sleeve toward the support pipe. Then, under the action of centrifugal force, the main support sleeve slides back and forth on the surface of the fan blade with a cleaning brush. The reciprocating cleaning brush brushes the surface of the fan blade to avoid the accumulation of dust and other polluting particles on the surface of the fan blade, thereby improving the service life of the exhaust fan blade.

Description

Technical Field

[0001] The present invention relates to the field of boiler tail gas exhaust fans, in particular to a boiler tail gas exhaust fan and a use method thereof. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. During the use of the boiler, a certain amount of exhaust gas will be generated. At this time, the exhaust gas of the boiler needs to be discharged through an exhaust fan. At the same time, the waste heat of the exhaust gas is usually recovered before the boiler is discharged to achieve energy-saving effects.

[0003] The existing patent (Announcement No.: CN115077285B) discloses an energy-saving boiler flue gas waste heat absorption device including a furnace body, two burner heat storage devices, a pipe assembly, a blower, an exhaust fan and an adjustment mechanism. In the process of implementing this solution, the inventor found that the following problems in the prior art have not been well solved: 1. Since a large amount of dust or particulate matter is generated during the combustion process inside the boiler, the final stage of exhaust gas emission is generally to purify the exhaust gas, but the exhaust fan is usually set before the purification device to extract the exhaust gas. The surface of the exhaust fan blades used for a long time is prone to dust and other polluting particles, causing corrosion to the blades and affecting the service life of the fan; 2. At the same time, since the boiler exhaust pipe will recover waste heat when discharging exhaust gas, and the alternation of hot and cold during the waste heat recovery process will produce condensed water, this condensed water is difficult to effectively utilize, resulting in a certain amount of waste. Summary of the Invention

[0004] The purpose of the present invention is to provide a boiler exhaust fan and a method of using the same, so as to solve the problems raised in the above-mentioned background technology: 1. After long-term use, dust and other pollutant particles will adhere to the surface of some existing boiler exhaust fans, which will cause corrosion to the fan blades; 2. During the use of some existing boiler exhaust fans, condensed water will be generated in the exhaust duct when recovering waste heat, which is difficult to use effectively. In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: A boiler exhaust fan, comprising an exhaust pipe, the right end of the exhaust pipe is fixedly connected to a waste heat recovery pipe, the right end of the waste heat recovery pipe is fixedly connected to a fan cover, the middle of the inner wall of the fan cover is fixedly connected to a bracket, the middle of the bracket is fixedly connected to a motor, the rotating end of the motor is fixedly connected to a support pipe, a water diversion mechanism is movably connected between the inside of the support pipe and the waste heat recovery pipe, six fan blades are fixedly connected at equal intervals along the circumference of the middle of the outer wall of the support pipe, and a cleaning mechanism that cooperates with the water diversion mechanism is movably connected between the surface of the fan blade and the bracket;

[0005] An inspection slot is provided on the top of the fan cover, and a sealing plate is movably connected inside the inspection slot.

[0006] Preferably, the water diversion mechanism includes a heat-insulating cover, which is fixedly sleeved on the outer surface of the waste heat recovery pipe. A heat exchange water pipe is provided inside the heat-insulating cover, and the heat exchange water pipe is fixedly connected to the outer wall of the waste heat recovery pipe. The bottom of the heat-insulating cover is fixedly connected to a water collecting box, and the side wall of the water collecting box is fixedly connected to a water diversion pipe. One end of the water diversion pipe passes through the fan cover and is fixedly connected to a rotary joint. The right side of the rotary joint is fixedly connected to the left end of the support pipe.

[0007] Both sides of the support tube are fixedly connected to a water storage ring, a through hole is opened between the inner ring of the water storage ring and the inner wall of the support tube, and six water bags are fixedly connected to both sides of the support tube at equal intervals along the circumference, and the side walls of the six water bags are fixedly connected to the adjacent water storage rings with a conduit, and the middle of the conduit is fixedly connected to a No. 1 one-way valve;

[0008] A No. 2 one-way valve cooperating with the cleaning mechanism is fixedly connected to the middle of the outer wall of the water bag, a pressure plate is movably connected inside the water bag, and a compression spring is fixedly connected between the side wall of the pressure plate and the inner wall of the water bag.

[0009] Preferably, the heat exchange water pipe is spirally wound on the surface of the waste heat recovery pipe, and both ends of the heat exchange water pipe extend from both sides of the insulation cover respectively. The inner bottom surface of the insulation cover is provided with a water hole that matches the water collecting box.

[0010] Preferably, the pressure plate is configured as an arc-shaped rubber plate, and a circular groove is provided in the middle of the pressure plate to match the No. 2 one-way valve.

[0011] Preferably, the cleaning mechanism includes an arc-shaped guide plate, wherein two arc-shaped guide plates are provided, and the two arc-shaped guide plates are symmetrically fixedly connected to both sides of the bracket, and a guide groove is provided on a side of the arc-shaped guide plate close to the fan blade;

[0012] A main support sleeve is movably sleeved on one side of the fan blade surface, and a slave support sleeve is movably sleeved on the other side of the fan blade surface. A sliding rod is slidably connected between the main support sleeve and both sides of the adjacent slave support sleeve, and a return spring is movably sleeved in the middle of the sliding rod;

[0013] The surface of the fan blade is fixedly connected to a stopper that cooperates with the main support sleeve, the inner wall of the main support sleeve is fixedly connected to a No. 1 mounting sleeve, the outer wall of the main support sleeve is fixedly connected to a connecting rod, and one end of the connecting rod is rotatably connected to a roller that cooperates with the guide groove;

[0014] The inner wall of the slave support sleeve is fixedly connected to a second mounting sleeve, the side wall of the second mounting sleeve is provided with a water diversion groove that cooperates with the water diversion mechanism, and the inner wall of the water diversion groove is fixedly connected to a partition plate;

[0015] A cleaning brush is movably connected between both sides of the main support sleeve and the slave support sleeve, and the side walls of the main support sleeve and the slave support sleeve are fixedly connected with a screw sleeve, the internal rotation of the screw sleeve is connected to a limit screw, and one end of the limit screw is movably inserted into the interior of the adjacent cleaning brush, and the side wall of the cleaning brush overlaps the side wall of the fan blade.

[0016] Preferably, both ends of the arc-shaped guide plate are configured to be tapered, and a support rod is fixedly connected to a side of the arc-shaped guide plate away from the bracket, and one end of the support rod is fixedly connected to the inner wall of the fan cover.

[0017] Preferably, the main support sleeve and the side opposite to the secondary support sleeve are symmetrically provided with sliding grooves, and one end of the sliding rod is slidably connected to the inside of the adjacent sliding groove.

[0018] A method for using a boiler exhaust fan comprises the following steps:

[0019] S1. When the starting motor rotates the support pipe and fan blades to exhaust the boiler's exhaust pipe, the high-temperature boiler exhaust gas first enters the waste heat recovery pipe. At this time, clean water is transported to the water diversion pipe. When heat exchange occurs between the cold water in the water diversion pipe and the waste heat recovery pipe, condensed water generated on the outer wall of the water diversion pipe flows to the inner bottom surface of the insulation cover and is collected by the water collection box.

[0020] S2. During the rotation of the six fan blades with the support tube, the main support sleeve and the slave support sleeve sliding on the support tube rotate accordingly. When the roller on the connecting rod on the side wall of the main support sleeve enters the guide groove on the arc guide plate, the roller drives the connecting rod to slide along the arc inner wall of the guide groove. At this time, the connecting rod pulls the main support sleeve and the slave support sleeve to slide on the surface of the fan blade toward the support tube position, so that the main support sleeve drives the slave support sleeve to squeeze toward the water bag position. At the same time, the cleaning brush between the main support sleeve and the slave support sleeve is pressurized to squeeze out the sewage generated during the brushing process.

[0021] S3. When the water bag is pressurized, the No. 1 one-way valve is closed and the No. 2 one-way valve is opened, so that the condensed water inside the water bag is sprayed into the interior of the partition plate, and the condensed water is dispersed and flushed on the cleaning brush after being squeezed, thereby cleaning the cleaning brush. At this time, the roller moves out of the guide groove on the arc guide plate, so that the cleaned cleaning brush, the main support sleeve and the secondary support sleeve slide towards the block on the fan blade under the action of centrifugal force, and the cleaning brush brushes the surface of the fan blade;

[0022] S4. Then the compression spring inside the water bag brings the pressure plate back to its original position, causing the water bag to gradually expand and recover. At this time, the No. 1 one-way valve is opened, and the No. 2 one-way valve is closed. Under the action of negative pressure, the water bag draws the condensed water inside the water storage ring through the catheter, and the water storage ring draws the condensed water inside the water collection box through the support pipe and the water inlet pipe. As the main support sleeve and the slave support sleeve on the fan blade move back and forth with the cleaning brush, the condensed water inside the water collection box is drawn into the water bag for reuse.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In the present invention, through the coordinated use of components such as the main support sleeve, the cleaning brush and the arc guide plate, when the support tube rotates with the fan blades to discharge the boiler exhaust gas, the connecting rod on the side wall of the main support sleeve on the fan blade rotates synchronously with the roller. When the roller rotates to the inside of the guide groove on the arc guide plate, the connecting rod pulls the main support sleeve and the support sleeve toward the support tube. Then, under the action of centrifugal force, the main support sleeve slides back and forth with the cleaning brush on the surface of the fan blade, and the reciprocating cleaning brush brushes the surface of the fan blade to avoid the accumulation of dust and other polluting particles on the surface of the fan blade, thereby improving the service life of the exhaust fan blade.

[0025] In the present invention, through the coordinated use of components such as the water bag, the slave support sleeve and the cleaning brush, when the main support sleeve brings the slave support sleeve to the water bag position, the main support sleeve and the slave support sleeve are pressed and gradually fit together. At this time, the cleaning brush is pressurized to discharge the sewage in the cleaning process, and then the water bag is pressurized to open the No. 2 one-way valve, and the condensed water extracted from the water bag is sprayed onto the cleaning brush, automatically rinsing the cleaning brush, realizing the reuse of the condensed water, and improving the cleaning effect of the cleaning brush on the fan blades.

[0026] In the present invention, through the coordinated use of components such as the No. 2 mounting sleeve, the partition plate and the water bag, when the No. 2 mounting sleeve is squeezed toward the water bag position with the partition plate, the condensed water inside the water bag is sprayed into the interior of the water inlet trough from the No. 2 one-way valve position, and then the partition plate divides the condensed water, so that the condensed water is dispersed and flushed on the side wall of the cleaning brush, thereby improving the cleaning effect of the cleaning brush. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front cross-sectional view of the waste heat recovery pipe and the fan cover of the present invention;

[0028] Figure 2 For the present invention Figure 1 A magnified view of the structure at center A;

[0029] Figure 3 It is a left sectional view of the fan blades and the arc-shaped guide plate of the present invention;

[0030] Figure 4 For the present invention Figure 3 A magnified view of the structure at B in the middle;

[0031] Figure 5 It is a left sectional view of the position of the arc guide plate and the roller of the present invention;

[0032] Figure 6 For the present invention Figure 5 A magnified view of the structure at center C;

[0033] Figure 7 It is a front view of the positions of the main support sleeve and the slave support sleeve of the present invention;

[0034] Figure 8 A side sectional view of a local position of the main support sleeve and the connecting rod of the present invention;

[0035] Figure 9 It is a top cross-sectional view of the local position of the support pipe and the water storage ring of the present invention;

[0036] Figure 10 It is a side sectional view of the position of the water bag and the pressure plate of the present invention.

[0037] Figure: 1, exhaust pipe; 2, waste heat recovery pipe; 3, fan cover; 4, bracket; 5, motor; 6, support pipe; 7, water diversion mechanism; 701, insulation cover; 702, heat exchange water pipe; 703, water collection box; 704, water diversion pipe; 705, rotary joint; 706, water storage ring; 707, through hole; 708, water bag; 709, guide tube; 710, one-way valve No. 1; 711, one-way valve No. 2; 712, pressure plate; 713, compression spring; 8 , fan blades; 9, cleaning mechanism; 901, arc guide plate; 902, guide groove; 903, main support sleeve; 904, slave support sleeve; 905, slide rod; 906, return spring; 907, stop block; 908, No. 1 mounting sleeve; 909, connecting rod; 910, roller; 911, No. 2 mounting sleeve; 912, water diversion trough; 913, partition plate; 914, cleaning brush; 915, screw sleeve; 916, limit screw; 10, inspection slot; 11, sealing plate. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] See also Figures 1 to 10The present invention provides a technical solution: a boiler exhaust fan, comprising an exhaust pipe 1, the right end of the exhaust pipe 1 is fixedly connected to a waste heat recovery pipe 2, the right end of the waste heat recovery pipe 2 is fixedly connected to a fan cover 3, the middle of the inner wall of the fan cover 3 is fixedly connected to a bracket 4, the middle of the bracket 4 is fixedly connected to a motor 5, the rotating end of the motor 5 is fixedly connected to a support pipe 6, a water diversion mechanism 7 is movably connected between the inside of the support pipe 6 and the waste heat recovery pipe 2, six fan blades 8 are fixedly connected to the middle of the outer wall of the support pipe 6 at equal intervals along the circumference, and a cleaning mechanism 9 that cooperates with the water diversion mechanism 7 is movably connected between the surface of the fan blade 8 and the bracket 4. It should be noted that: a protective cover is fixedly connected to the middle of the bracket 4, and the motor 5 is fixedly connected to the inside of the protective cover; and a support ring frame is movably connected between the left side of the support pipe 6 and the inner wall of the fan cover 3 to improve the rotation stability of the support pipe 6.

[0040] The top of the fan cover 3 is provided with an inspection slot 10, and the interior of the inspection slot 10 is movably connected with a sealing plate 11. It should be noted that it is convenient to replace the cleaning brush 914 inside the cleaning mechanism 9 and improve the convenience of inspection.

[0041] In this embodiment, Figures 1 to 10 As shown, the water diversion mechanism 7 includes a heat-insulating cover 701, which is fixedly sleeved on the outer surface of the waste heat recovery pipe 2. A heat exchange water pipe 702 is disposed inside the heat-insulating cover 701 and is fixedly connected to the outer wall of the waste heat recovery pipe 2. A water collection box 703 is fixedly connected to the bottom of the heat-insulating cover 701, and a water diversion pipe 704 is fixedly connected to the side wall of the water collection box 703. One end of the water diversion pipe 704 passes through the fan cover 3 and is fixedly connected to a rotary joint 705. The right side of the rotary joint 705 is fixedly connected to the left end of the support pipe 6. It should be noted that the rotary joint 705 is provided so that the support pipe 6 will not rotate with the water diversion pipe 704 during rotation, thereby avoiding interference.

[0042] Water storage rings 706 are fixedly connected to both sides of the support tube 6. A through hole 707 is formed between the inner ring of the water storage ring 706 and the inner wall of the support tube 6. Six water bladders 708 are fixedly connected to both sides of the support tube 6 at equal intervals along the circumference. The side walls of each of the six water bladders 708 are fixedly connected to adjacent water storage rings 706 through a conduit 709. The middle of the conduit 709 is fixedly connected to a first check valve 710. It should be noted that there are twelve water bladders 708, with two water bladders 708 placed on either side of the fan blade 8.

[0043] A second one-way valve 711, which cooperates with the cleaning mechanism 9, is fixedly connected to the middle of the outer wall of the water bladder 708. A pressure plate 712 is movably connected to the interior of the water bladder 708. A compression spring 713 is fixedly connected between the side wall of the pressure plate 712 and the inner wall of the water bladder 708. It should be noted that when the water bladder 708 is pressurized, the first one-way valve 710 is closed, while the second one-way valve 711 opens under the action of the water pressure inside the water bladder 708. Conversely, when the water bladder 708 expands and recovers, the second one-way valve 711 closes, and the first one-way valve 710 opens under the action of the negative pressure inside the water bladder 708 to extract the condensed water generated during the heat exchange process.

[0044] In this embodiment, Figures 1 to 10 As shown, heat exchange water pipe 702 is spirally wound around the surface of waste heat recovery pipe 2, with both ends of heat exchange water pipe 702 extending from either side of insulation cover 701. The inner bottom surface of insulation cover 701 is provided with a water hole that cooperates with water collection box 703. It should be noted that the middle portion of waste heat recovery pipe 2 is provided as a heat-conducting copper tube, and cold water flows inside heat exchange water pipe 702 to facilitate heat exchange with the cold water. The spirally wound heat exchange water pipe 702 can increase the heat exchange time of the cold water and improve heat exchange efficiency.

[0045] In this embodiment, Figures 1 to 10 As shown, the pressure plate 712 is configured as an arc-shaped rubber plate, and a circular groove is provided in the middle of the pressure plate 712 to cooperate with the second one-way valve 711. It should be noted that the circular groove is provided to prevent the second one-way valve 711 from being squeezed onto the pressure plate 712 when the water bag 708 is pressurized.

[0046] In this embodiment, Figures 1 to 10 As shown, the cleaning mechanism 9 includes two arc-shaped guide plates 901 , which are symmetrically fixedly connected to both sides of the bracket 4 , and a guide groove 902 is provided on one side of the arc-shaped guide plate 901 close to the fan blade 8 .

[0047] A main support sleeve 903 is movably connected to one side of the surface of the fan blade 8, and a slave support sleeve 904 is movably connected to the other side of the surface of the fan blade 8. A sliding rod 905 is slidably connected between both sides of the main support sleeve 903 and the adjacent slave support sleeve 904, and a return spring 906 is movably connected to the middle part of the sliding rod 905.

[0048] The surface of the fan blade 8 is fixedly connected to a stopper 907 that cooperates with the main support sleeve 903. The inner wall of the main support sleeve 903 is fixedly connected to a No. 1 mounting sleeve 908. The outer wall of the main support sleeve 903 is fixedly connected to a connecting rod 909. One end of the connecting rod 909 is rotatably connected to a roller 910 that cooperates with the guide groove 902. It should be noted that the outer ring of the roller 910 is rotatably connected to the four sides, which can reduce the friction resistance of the roller 910 during the sliding process inside the guide groove 902.

[0049] A second mounting sleeve 911 is fixedly connected to the inner wall of the support sleeve 904. The side wall of the second mounting sleeve 911 is provided with a water diversion groove 912 that cooperates with the water diversion mechanism 7. A partition plate 913 is fixedly connected to the inner wall of the water diversion groove 912. It should be noted that both the first mounting sleeve 908 and the second mounting sleeve 911 are movably connected to the fan blade 8; when the water diversion groove 912 of the second mounting sleeve 911 is pressed against the surface of the corresponding water bag 708, the water bag 708 is pressurized to open the second one-way valve 711 to spray water. At this time, the sprayed water is diverted by the partition plate 913, and the clean condensed water is dispersed and flushed on the side wall of the cleaning brush 914, automatically cleaning the cleaning brush 914.

[0050] A cleaning brush 914 is movably connected between both sides of the main support sleeve 903 and the secondary support sleeve 904. The side walls of the main support sleeve 903 and the secondary support sleeve 904 are fixedly connected with a screw sleeve 915. The internal rotation of the screw sleeve 915 is connected to a limit screw 916. One end of the limit screw 916 is movably inserted into the interior of the adjacent cleaning brush 914. The side wall of the cleaning brush 914 overlaps the side wall of the fan blade 8. It should be noted that the screw sleeve 915 cooperates with the limit screw 916 to facilitate the installation and replacement of the cleaning brush 914. The cleaning brush 914 is made of sponge material. In addition, the inner walls of the main support sleeve 903 and the secondary support sleeve 904 are symmetrically connected with steel balls. The side walls of the steel balls overlap the surface of the fan blade 8. The steel ball arrangement can position the main support sleeve 903 and the secondary support sleeve 904 and reduce the friction resistance during the sliding of the main support sleeve 903 and the secondary support sleeve 904 on the surface of the fan blade 8.

[0051] In this embodiment, Figures 1 to 10 As shown, both ends of the arc guide plate 901 are set to be tapered, and a support rod is fixedly connected to the side of the arc guide plate 901 away from the bracket 4, and one end of the support rod is fixedly connected to the inner wall of the fan cover 3.

[0052] In this embodiment, Figures 1 to 10 As shown, the main support sleeve 903 and the slave support sleeve 904 are symmetrically provided with slide grooves on opposite sides, and one end of the slide rod 905 is slidably connected to the inside of the adjacent slide groove. It should be noted that the slide rod 905 is configured as an H-shaped rod to prevent the slide rod 905 from sliding out of the two slide grooves; the two ends of the return spring 906 are respectively overlapped on the side walls of the main support sleeve 903 and the slave support sleeve 904. Under the elastic action of the return spring 906, the main support sleeve 903 and the slave support sleeve 904 are in a separated state. When the main support sleeve 903 and the slave support sleeve 904 move relative to each other, they can squeeze the cleaning brush 914, squeezing out the dirty water generated by the cleaning brush 914 brushing the fan blades 8.

[0053] In this embodiment, Figures 1 to 10 As shown, a method for using a boiler exhaust fan includes the following steps:

[0054] S1. When the starting motor 5 rotates with the support tube 6 and the fan blades 8 to exhaust the boiler exhaust pipe 1, the high-temperature boiler exhaust gas first enters the interior of the waste heat recovery pipe 2. At this time, clean water is supplied to the interior of the water diversion pipe 704. When heat exchange occurs between the cold water in the water diversion pipe 704 and the waste heat recovery pipe 2, condensed water generated on the outer wall of the water diversion pipe 704 flows to the inner bottom surface of the thermal insulation cover 701 and is collected by the water collection box 703.

[0055] S2. During the rotation of the support tube 6 with the six fan blades 8, the main support sleeve 903 and the slave support sleeve 904 sliding on the support tube 6 rotate along with it. When the roller 910 on the connecting rod 909 on the side wall of the main support sleeve 903 enters the guide groove 902 on the arc guide plate 901, the roller 910 slides along the arc inner wall of the guide groove 902 with the connecting rod 909. At this time, the connecting rod 909 pulls the main support sleeve 903 and the slave support sleeve 904 to slide on the surface of the fan blade 8 toward the position of the support tube 6, so that the main support sleeve 903 and the slave support sleeve 904 are squeezed toward the position of the water bag 708. At the same time, the cleaning brush 914 between the main support sleeve 903 and the slave support sleeve 904 is pressurized to squeeze out the sewage generated during the brushing process on the cleaning brush 914;

[0056] S3. When the water bag 708 is under pressure, the first check valve 710 is closed and the second check valve 711 is opened, so that the condensed water inside the water bag 708 is sprayed into the interior of the partition plate 913, and the condensed water is dispersed and flushed on the cleaning brush 914 after being squeezed, thereby cleaning the cleaning brush 914. At this time, the roller 910 moves out from the guide groove 902 on the arc guide plate 901, so that the cleaned cleaning brush 914, the main support sleeve 903 and the secondary support sleeve 904 slide towards the stopper 907 on the fan blade 8 under the action of centrifugal force, and the cleaning brush 914 brushes the surface of the fan blade 8;

[0057] S4. Then the compression spring 713 inside the water bag 708 brings the pressure plate 712 back to its original position, causing the water bag 708 to gradually expand and recover. At this time, the No. 1 one-way valve 710 is opened, and the No. 2 one-way valve 711 is closed. Under the action of negative pressure, the water bag 708 draws the condensed water inside the water storage ring 706 through the conduit 709, and the water storage ring 706 cooperates with the support tube 6 and the water guide pipe 704 to draw the condensed water inside the water collection box 703. As the main support sleeve 903 on the fan blade 8 and the slave support sleeve 904 move back and forth with the cleaning brush 914, the condensed water inside the water collection box 703 is drawn into the water bag 708 for reuse.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A boiler exhaust fan, comprising an exhaust pipe (1), characterized in that: The right end of the exhaust pipe (1) is fixedly connected to a waste heat recovery pipe (2), the right end of the waste heat recovery pipe (2) is fixedly connected to a fan cover (3), the middle of the inner wall of the fan cover (3) is fixedly connected to a bracket (4), the middle of the bracket (4) is fixedly connected to a motor (5), the rotating end of the motor (5) is fixedly connected to a support pipe (6), the interior of the support pipe (6) is movably connected to a water diversion mechanism (7) between the waste heat recovery pipe (2), the middle of the outer wall of the support pipe (6) is fixedly connected to six fan blades (8) at equal intervals along the circumference, and the surface of the fan blades (8) is movably connected to a cleaning mechanism (9) that cooperates with the water diversion mechanism (7) between the bracket (4); An inspection slot (10) is provided on the top of the fan cover (3), and a sealing plate (11) is movably connected inside the inspection slot (10); The water diversion mechanism (7) comprises a heat-insulating cover (701), the heat-insulating cover (701) is fixedly sleeved on the outer surface of the waste heat recovery pipe (2), a heat exchange water pipe (702) is provided inside the heat-insulating cover (701), the heat exchange water pipe (702) is fixedly connected to the outer wall of the waste heat recovery pipe (2), the bottom of the heat-insulating cover (701) is fixedly connected to a water collecting box (703), the side wall of the water collecting box (703) is fixedly connected to a water diversion pipe (704), one end of the water diversion pipe (704) passes through the fan cover (3) and is fixedly connected to a rotary joint (705), and the right side of the rotary joint (705) is fixedly connected to the left end of the support pipe (6); Both sides of the support tube (6) are fixedly connected with water storage rings (706), a through hole (707) is provided between the inner ring of the water storage ring (706) and the inner wall of the support tube (6), and six water bags (708) are fixedly connected to both sides of the support tube (6) at equal intervals along the circumference, and the side walls of the six water bags (708) are fixedly connected to adjacent water storage rings (706) with a conduit (709), and the middle of the conduit (709) is fixedly connected to a No. 1 one-way valve (710); A second one-way valve (711) that cooperates with the cleaning mechanism (9) is fixedly connected to the middle of the outer wall of the water bag (708), a pressure plate (712) is movably connected inside the water bag (708), and a compression spring (713) is fixedly connected between the side wall of the pressure plate (712) and the inner wall of the water bag (708).

2. The exhaust fan for a boiler according to claim 1, characterized in that: The heat exchange water pipe (702) is spirally wound on the surface of the waste heat recovery pipe (2), and the two ends of the heat exchange water pipe (702) extend from both sides of the heat insulation cover (701) respectively. The inner bottom surface of the heat insulation cover (701) is provided with a water hole that matches the water collection box (703).

3. The exhaust fan for a boiler according to claim 2, characterized in that: The pressing plate (712) is configured as an arc-shaped rubber plate, and a circular groove is provided in the middle of the pressing plate (712) to match the No. 2 one-way valve (711).

4. The exhaust fan for a boiler according to claim 3, characterized in that: The cleaning mechanism (9) comprises an arc-shaped guide plate (901), wherein two arc-shaped guide plates (901) are provided, and the two arc-shaped guide plates (901) are symmetrically fixedly connected to two sides of the bracket (4), and a guide groove (902) is provided on a side of the arc-shaped guide plate (901) close to the fan blade (8); A main support sleeve (903) is movably sleeved on one side of the surface of the fan blade (8), and a slave support sleeve (904) is movably sleeved on the other side of the surface of the fan blade (8). A sliding rod (905) is slidably connected between the main support sleeve (903) and the two sides of the adjacent slave support sleeve (904), and a return spring (906) is movably sleeved in the middle of the sliding rod (905); The surface of the fan blade (8) is fixedly connected to a stopper (907) that matches the main support sleeve (903); the inner wall of the main support sleeve (903) is fixedly connected to a No. 1 mounting sleeve (908); the outer wall of the main support sleeve (903) is fixedly connected to a connecting rod (909); one end of the connecting rod (909) is rotatably connected to a roller (910) that matches the guide groove (902); A second mounting sleeve (911) is fixedly connected to the inner wall of the secondary support sleeve (904); a water diversion groove (912) that cooperates with the water diversion mechanism (7) is provided on the side wall of the second mounting sleeve (911); and a partition plate (913) is fixedly connected to the inner wall of the water diversion groove (912); A cleaning brush (914) is movably connected between both sides of the main support sleeve (903) and the secondary support sleeve (904); a screw sleeve (915) is fixedly connected to the side walls of the main support sleeve (903) and the secondary support sleeve (904); a limit screw (916) is rotatably connected inside the screw sleeve (915); one end of the limit screw (916) is movably inserted into the interior of the adjacent cleaning brush (914); and the side wall of the cleaning brush (914) overlaps the side wall of the fan blade (8).

5. The exhaust fan for a boiler according to claim 4, characterized in that: Both ends of the arc-shaped guide plate (901) are configured as cones, and a support rod is fixedly connected to the side of the arc-shaped guide plate (901) away from the bracket (4), and one end of the support rod is fixedly connected to the inner wall of the fan cover (3).

6. The exhaust fan for a boiler according to claim 5, characterized in that: The main support sleeve (903) and the side opposite to the secondary support sleeve (904) are both symmetrically provided with sliding grooves, and one end of the sliding rod (905) is slidably connected to the inside of the adjacent sliding groove.

7. The method for using a boiler exhaust fan according to claim 6, characterized in that: The steps include: S1. When the starting motor (5) rotates with the support pipe (6) and the fan blade (8) to exhaust the exhaust gas from the boiler (1), the high-temperature boiler exhaust gas first enters the interior of the waste heat recovery pipe (2). At this time, clean water is transported to the interior of the water diversion pipe (704). When heat exchange occurs between the cold water in the water diversion pipe (704) and the waste heat recovery pipe (2), condensed water generated on the outer wall of the water diversion pipe (704) flows toward the inner bottom surface of the heat preservation cover (701), and the condensed water is collected by the water collection box (703); S2. During the rotation of the support tube (6) with the six fan blades (8), the main support sleeve (903) and the slave support sleeve (904) sliding on the support tube (6) rotate accordingly. When the roller (910) on the connecting rod (909) on the side wall of the main support sleeve (903) enters the inside of the guide groove (902) on the arc guide plate (901), the roller (910) slides along the arc inner wall of the guide groove (902) with the connecting rod (909). At this time, the connecting rod (909) pulls the main support sleeve (903) and the slave support sleeve (904) to slide on the surface of the fan blade (8) toward the position of the support tube (6), so that the main support sleeve (903) and the slave support sleeve (904) are squeezed toward the position of the water bag (708). At the same time, the cleaning brush (914) between the main support sleeve (903) and the slave support sleeve (904) is pressurized to squeeze out the sewage generated during the brushing process on the cleaning brush (914); S3, when the water bag (708) is under pressure, the first one-way valve (710) is closed, and the second one-way valve (711) is opened, so that the condensed water inside the water bag (708) is sprayed into the inside of the partition plate (913), so that the condensed water is dispersed and flushed on the cleaning brush (914) after being squeezed, and the cleaning brush (914) is cleaned. At this time, the roller (910) moves out from the inside of the guide groove (902) on the arc guide plate (901), so that the cleaned cleaning brush (914), the main support sleeve (903) and the secondary support sleeve (904) slide towards the stopper (907) on the fan blade (8) under the action of centrifugal force, and the cleaning brush (914) brushes the surface of the fan blade (8); S4. Then the compression spring (713) inside the water bag (708) brings the pressure plate (712) back to its original position, causing the water bag (708) to gradually expand and recover. At this time, the No. 1 one-way valve (710) is opened, while the No. 2 one-way valve (711) is closed. Under the action of negative pressure, the water bag (708) extracts the condensed water inside the water storage ring (706) through the guide tube (709), and the water storage ring (706) extracts the condensed water inside the water collection box (703) through the support tube (6) and the water guide tube (704). As the main support sleeve (903) on the fan blade (8) and the secondary support sleeve (904) move back and forth with the cleaning brush (914), the condensed water inside the water collection box (703) is pumped into the water bag (708) for reuse.

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