Boiler environmental induced draft fan cooling circulating water system

Abstract

The application discloses a boiler environment-friendly induced draft fan cooling circulating water system and belongs to the technical field of cooling water circulation, which comprises a normal water circulating device and an emergency water circulating device. When the normal water circulating device operates, the water outlet pipe is communicated with the water supply pipe, water in the water tank is introduced into the water supply pipe from the water outlet pipe, and then is drained into the cooling assembly from the water supply pipe. The water absorbs heat in the cooling assembly and cools the induced draft fan. The heat-absorbed water is returned to the inside of the water tank from the return pipe, and the induced draft fan is cooled in circulation. When the emergency water circulating device operates, the emergency pipe is communicated with the water supply pipe, and the emergency pipe provides water source for the water supply pipe. At this time, the water supply pipe is drained into the cooling assembly from the water supply pipe. After the water absorbs heat in the cooling assembly and cools the induced draft fan, the heat-absorbed water is returned to the inside of the water tank 1, so that a complete emergency water circulation is completed, and the induced draft fan is not damaged due to untimely cooling after a sudden power failure, thereby ensuring the normal operation of the induced draft fan.

Description

Technical Field

[0001] This invention relates to an environmentally friendly induced draft fan cooling circulating water system for boilers, belonging to the field of cooling water circulation technology. Background Technology

[0002] Boilers are crucial equipment for flue gas environmental protection in glass manufacturing, such as waste heat recovery and flue gas cooling. During boiler operation, a large amount of flue gas entering the furnace needs to be processed. To solve the flue gas cooling problem, an induced draft fan can be introduced to increase the flue gas flow rate, thereby reducing the temperature of the flue gas at the inlet and ensuring sufficient contact between the flue gas and the water system, thus improving heat exchange efficiency. However, due to the continuous operation of the equipment, the boiler induced draft fan requires a cooling system, typically using water cooling. Under normal conditions, an electric pump controls the water pump to introduce cold water for cooling. However, in the event of a sudden power outage, the water circulation system will malfunction and cannot operate normally. The boiler induced draft fan will not be cooled in time and may be damaged, thus compromising its normal operation. Therefore, an environmentally friendly boiler induced draft fan cooling circulating water system is proposed. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a boiler environmentally friendly induced draft fan cooling circulating water system, which can ensure that after a sudden power outage, the emergency water circulation device can cool the induced draft fan in a timely manner to prevent damage to the induced draft fan, thereby ensuring the normal operation of the induced draft fan.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a boiler environmentally friendly induced draft fan cooling circulating water system, comprising:

[0005] A common water circulation system includes a water tank, a supply pipe, a water pump, and a return pipe. The bottom of the water tank is connected to an outlet pipe, which is connected to the supply pipe. The return pipe is connected to the top of the water tank, and a cooling device for cooling the return water is connected in series on its side wall. The ends of both the supply and return pipes furthest from the water tank are connected to the induced draft fan. A cooling assembly for cooling the induced draft fan is connected in series between the supply and return pipes. The cooling assembly can be a spiral or U-shaped aluminum tube, with both ends connected to the supply and return pipes respectively. The aluminum tube is positioned at the heat-generating parts of the induced draft fan. After the supply pipe introduces low-temperature water into the aluminum tube, heat is transferred to the water. As the water flows, the water carries away the heat. The cooling system for the induced draft fan is achieved by connecting water pumps to the water supply pipe. Multiple water pumps can be used, and the water supply pipe can branch to direct water to different locations within the induced draft fan or to multiple induced draft fans. Each branch is equipped with a corresponding water pump. The operation of each pump controls the flow of water within the branch. Each branch corresponds to a cooling component. After the water passes through each cooling component and cools different locations within the induced draft fan or multiple induced draft fans, the water from each cooling component flows into a return water pipe and back to the water tank. When the water pump starts, the water supply pipe draws water from the water tank to the induced draft fan to cool it, and then the water flows back to the water tank through the return water pipe, forming a circulating cooling system for the induced draft fan.

[0006] Emergency water circulation device, including an emergency pipe connected to the municipal water supply network;

[0007] The emergency pipe is connected to a three-way valve at one end, which is also connected between the outlet pipe and the supply pipe. The three-way valve has a valve core inside that controls the alternating connection between the outlet pipe, the emergency pipe, and the supply pipe. One end of the valve core is fixedly connected to a connecting rod, the end of which passes through the side wall of the three-way valve and is connected to the drive assembly. When the drive assembly is energized, the outlet pipe is connected to the supply pipe, and the water pump starts. The water pump provides suction to draw water from the water tank. At this time, the water in the water tank is introduced into the supply pipe from the outlet pipe, and then guided to the cooling assembly from the supply pipe. The water absorbs heat in the cooling assembly and cools the induced draft fan. The water that has absorbed heat flows back to the inside of the water tank from the return pipe, thus completing a complete set of normal water circulation to circulate and cool the induced draft fan. When the drive assembly is de-energized, i.e., in the event of a sudden power outage, the emergency pipe is connected to the supply pipe.

[0008] Preferably, the drive assembly includes a stop block, which is fixedly connected to the end of the connecting rod. An annular groove is formed on the side wall of the stop block, and a spring is sleeved on the connecting rod to press the stop block. Two locking rods are symmetrically connected to the side wall of the three-way valve on both sides of the connecting rod via torsion springs. The ends of the two locking rods are movably engaged with the side wall of the annular groove. The torsion springs are sleeved on the rotating shafts of the locking rods, providing torque to twist the locking rods towards the annular groove. A pry bar is fixedly connected to the side wall of the locking rod, and the pry bar and locking rod are integrally formed, arranged in a "V" shape. When the two pry bars are flipped outward, the locking rods and pry bars are linked, and the ends of the locking rods disengage from the inside of the annular groove. The drive assembly also includes a housing, which is fixed... Installed at the end of the three-way valve, the stop block, the lever, and the lever cover are inside the housing. Inside the housing, a top plate made of magnetic metal is slidably connected via guide rods. The top plate is located between two pry bars, and a second spring for pressing the top plate is sleeved on the guide rod. The guide rods are set along the sliding direction of the stop block, and there are multiple guide rods. The second spring is sleeved on the side of the guide rod away from the stop block, and an electromagnet is fixedly installed on the side wall of the housing. When the electromagnet is energized, it attracts the top plate, and the second spring is compressed by the top plate. When the electromagnet is de-energized, the attraction force of the electromagnet on the top plate disappears, and the second spring presses the top plate, causing the top plate to flip outward against the two pry bars, thereby driving the end of the lever to disengage from the inside of the annular groove.

[0009] Preferably, rollers are rotatably connected to both ends of the top plate, and the two rollers are respectively rolled on the side wall of the pry bar on the same side.

[0010] Preferably, the pry bar is longer than the locking bar. This utilizes the lever principle, and the longer the pry bar is, the easier it is to rotate the locking bar so that the end of the locking bar can disengage from the inside of the annular groove.

[0011] Preferably, the end of the valve core away from the first connecting rod is connected to the second connecting rod, and the end of the second connecting rod passes through the side wall of the three-way valve and is fixedly connected to a handle.

[0012] Preferably, one side of the water tank is provided with an overflow pipe that can discharge the introduced tap water.

[0013] Preferably, the outlet end of the return water pipe inserted into the water tank is bent upwards into a vertical position, the inlet end of the overflow pipe inserted into the water tank is bent downwards into a vertical position, and the outlet end of the return water pipe is located directly below the inlet end of the overflow pipe. There is a certain distance between the outlet end of the return water pipe and the inlet end of the overflow pipe. A hollow telescopic tube is slidably connected inside the outlet end of the return water pipe, and an air bladder is connected to the upper end of the telescopic tube.

[0014] Preferably, a drain pipe is provided at the upper end of the overflow pipe, and the drain pipe is vertically fixedly connected to the overflow pipe.

[0015] Compared with the prior art, the present invention, by energizing the drive component and connecting the outlet pipe to the supply pipe, allows water in the water tank to be introduced into the supply pipe from the outlet pipe, and then guided to the cooling component. The water absorbs heat in the cooling component and cools the induced draft fan. The water that has absorbed heat flows back to the inside of the water tank from the return pipe, thus completing a complete normal water circulation to circulate and cool the induced draft fan. When the drive component is de-energized, the emergency pipe connects to the supply pipe and provides water to the supply pipe. At this time, the water is guided to the cooling component from the supply pipe. The water absorbs heat in the cooling component and cools the induced draft fan. The water that has absorbed heat flows back to the inside of the water tank from the return pipe, thus completing a complete emergency water circulation. This ensures that the induced draft fan is not damaged due to untimely cooling after a sudden power outage, thereby guaranteeing the normal operation of the induced draft fan. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the water outlet pipe, water supply pipe, emergency pipe and three-way valve of the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of the water tank, return pipe and overflow pipe of the present invention.

[0019] Figure 4 This is a cross-sectional view of the three-way valve and valve core of the present invention.

[0020] Figure 5 This is a cross-sectional view of the three-way valve, valve core, stop block, locking rod, and pry bar of the present invention.

[0021] Figure 6 This is a cross-sectional view of the water supply pipe, emergency pipe, and three-way valve of the present invention.

[0022] Figure 7 This is a schematic diagram of the structure of the three-way valve, stop block, annular groove, clamping rod and pry bar of the present invention.

[0023] In the diagram: 1. Water tank; 101. Outlet pipe; 2. Supply pipe; 3. Water pump; 4. Return pipe; 5. Exhaust fan; 6. Drain pipe; 7. Emergency pipe; 8. Three-way valve; 801. Valve core; 802. Partition 1; 803. Partition 2; 9. Drive assembly; 901. Stop block; 902. Ring groove; 903. Spring 1; 904. Locking rod; 905. Torsion spring; 906. Pry bar; 907. Housing; 908. Guide rod; 909. Top plate; 9010. Spring 2; 9011. Electromagnet; 10. Connecting rod 1; 11. Roller; 12. Connecting rod 2; 13. Handle; 14. Overflow pipe; 15. Cooling device; 16. Telescopic pipe; 17. Airbag. Detailed Implementation

[0024] The present invention is illustrated below with specific embodiments, but these are not intended to limit the invention.

[0025] Example 1

[0026] like Figure 1 , Figure 2 as well as Figures 4-7 As shown in this embodiment, a boiler environmentally friendly induced draft fan cooling circulating water system is provided, comprising:

[0027] A common water circulation device includes a water tank 1, a water supply pipe 2, a water pump 3, and a return water pipe 4. The bottom of the water tank 1 is connected to an outlet pipe 101, and the water supply pipe 2 is connected to the outlet pipe 101. The return water pipe 4 is connected to the upper part of the water tank 1. A cooling device 15 for cooling the return water in the return water pipe 4 is connected in series on the side wall of the return water pipe 4. The ends of the water supply pipe 2 and the return water pipe 4 furthest from the water tank 1 are connected to the induced draft fan 5. A cooling assembly for cooling the induced draft fan 5 is connected in series between the water supply pipe 2 and the return water pipe 4. The cooling assembly can be a spiral or U-shaped aluminum tube, with both ends connected to the water supply pipe 2 and the return water pipe 4 respectively. The aluminum tube is positioned at the heat-generating part of the induced draft fan 5. After the water supply pipe 2 introduces low-temperature water into the aluminum tube, heat is transferred to the water. As the water flows, the water carries away the heat, thus cooling the induced draft fan 5. However, to cool down, the water pump 3 is connected to the water supply pipe 2. There can be multiple water pumps 3. The water supply pipe 2 can branch to divert water to different positions of the induced draft fan 5 or to multiple induced draft fans 5. Each branch is equipped with a corresponding water pump 3. The operation of each water pump 3 can control the flow of water in the branch. Each branch corresponds to a cooling component. After the water passes through each cooling component to cool different positions of the induced draft fan 5 or multiple induced draft fans 5, the water from each cooling component flows to a return water pipe 4 and returns to the inside of the water tank 1. When the water pump 3 starts, the water supply pipe 2 leads the water in the water tank 1 to the induced draft fan 5 to cool it. Then, the water is returned to the water tank 1 through the return water pipe 4, forming a circulating cooling of the induced draft fan 5. The speed of the water pump 3 is dynamically adjusted by daily flow and water temperature detection to achieve the purpose of saving electricity.

[0028] An emergency water circulation device, including an emergency pipe 7 connected to the municipal water supply network;

[0029] The emergency pipe 7 is connected to a three-way valve 8 at one end, and the three-way valve 8 is connected between the outlet pipe 101 and the supply pipe 2. The three-way valve 8 has a valve core 801 inside for controlling the alternating connection between the outlet pipe 101, the emergency pipe 7, and the supply pipe 2. Figure 6As shown, the outlet pipe 101 and the emergency pipe 7 are connected side-by-side to the side wall of the three-way valve 8. The supply pipe 2 is connected to the other side of the three-way valve 8, and the supply pipe 2 is located in the middle of the outlet pipe 101 and the emergency pipe 7. The valve core 801 can slide axially along the inner cavity of the three-way valve 8. A partition block 802 that slides and seals with the inner cavity of the three-way valve 8 is provided in the middle of the valve core 801. Partition blocks 803 that slide and seal with the inner cavity of the three-way valve 8 are provided at both ends of the valve core 801. The diameter of the remaining parts of the valve core 801 is smaller than the inner diameter of the three-way valve 8. Figure 6 In the indicated state, with partition 802 positioned between emergency pipe 7 and water supply pipe 2, outlet pipe 101 and water supply pipe 2 are connected via three-way valve 8. Conversely, when partition 802 is positioned between outlet pipe 101 and water supply pipe 2, emergency pipe 7 and water supply pipe 2 are connected via three-way valve 8. One end of valve core 801 is fixedly connected to connecting rod 10, the end of which penetrates the side wall of three-way valve 8 and is connected to drive assembly 9. When drive assembly 9 is energized, outlet pipe 101 is connected to water supply pipe 2, at which point water pump 3 starts, providing suction to draw water from water tank 1. Water from water tank 1 is then introduced into water supply pipe 2 from outlet pipe 101, and then guided to cooling assembly from water supply pipe 2. The water absorbs heat in cooling assembly and affects the induced draft fan 5. After cooling, the heat-absorbing water flows back to the interior of the water tank 1 through the return water pipe 4, thus completing a complete normal water circulation to circulate and cool the induced draft fan 5. When the drive component 9 is de-energized, i.e., in the event of a sudden power outage, the emergency pipe 7 is connected to the water supply pipe 2. At this time, since the emergency pipe 7 is connected to the tap water network, it serves as a backup water source to provide the necessary cooling capacity and pressure for cooling the induced draft fan 5. That is, the emergency pipe 7 provides water to the water supply pipe 2. At this time, the water supply pipe is led from the water supply pipe 2 to the cooling component. The water absorbs heat in the cooling component and cools the induced draft fan 5. After the heat-absorbing water flows back to the interior of the water tank 1 through the return water pipe 4, a complete emergency water circulation is completed to ensure that the induced draft fan 5 is not damaged due to untimely cooling after a sudden power outage, thus ensuring the normal operation of the induced draft fan 5.

[0030] like Figures 4-7 As shown, in the event of a sudden power outage, in order to automatically switch the water supply pipe 2 to connect with the emergency pipe 7, the drive assembly 9 includes a stop block 901. The stop block 901 is fixedly connected to the end of the connecting rod 10. An annular groove 902 is formed on the side wall of the stop block 901, and a spring 903 for pressing the stop block 901 is sleeved on the connecting rod 10. Two locking rods 904 are symmetrically rotatably connected to the side wall of the three-way valve 8 on both sides of the connecting rod 10 via torsion springs 905. The ends of the two locking rods 904 are movably engaged with the side wall of the annular groove 902. Figure 7As shown, a torsion spring 905 is sleeved on the pivot of the locking rod 904. The torsion spring 905 provides the torque to twist the locking rod 904 toward the annular groove 902, and a pry bar 906 is fixedly connected to the side wall of the locking rod 904. Figure 7 As shown, the pry bar 906 and the locking bar 904 are integrally formed and are arranged in a "V" shape. When the two pry bars 906 are flipped outward, the locking bar 904 and the pry bar 906 are linked, and the end of the locking bar 904 disengages from the inside of the annular groove 902. The drive assembly 9 also includes a housing 907, which is fixedly installed at the end of the three-way valve 8. The stop block 901, the locking bar 904, and the locking bar 904 are covered inside the housing 907. A top plate 909 made of magnetic metal is slidably connected inside the housing 907 through a guide rod 908. The top plate 909 is located between the two pry bars 906, and a spring 9010 for pressing the top plate 909 is sleeved on the guide rod 908. Figure 4 As shown, the guide rod 908 is arranged along the sliding direction of the stop block 901 (valve core 801). There are multiple guide rods 908, and the second spring 9010 is sleeved on the side of the guide rod 908 away from the stop block 901. An electromagnet 9011 is fixedly installed on the side wall of the housing 907. When the electromagnet 9011 is energized, the electromagnet 9011 attracts the top plate 909. At this time, the second spring 9010 is compressed by the top plate 909. When the electromagnet 9011 is de-energized, the attraction force of the electromagnet 9011 on the top plate 909 disappears. At this time, the second spring 9010 presses the top plate 909, causing the top plate 909 to push against the two pry bars 906 and flip outward to drive the end of the clamp 904 out of the annular groove 902.

[0031] The operation process of driver component 9:

[0032] When the moving stop 901 causes the compression spring 903 to move, the locking rod 904 engages inside the annular groove 902. At this time, the stop 901 drives the valve core 801 to slide through the connecting rod 10, causing the partition 802 to move between the emergency pipe 7 and the water supply pipe 2. At this time, the water in the water tank 1 can be drawn out from the outlet pipe 101 to the inside of the water supply pipe 2, and the electromagnet 9011 is energized (the power supply line of the electromagnet 9011 and the power supply line of the water pump 3 are the same power supply line), so that the electromagnet 9011 is energized and attracts the top plate 909. At this time, the top plate 909 is in the state of compressing the spring 9010. The top plate 909 does no work on the pry bar 906. At this time, with the start of the water pump 3, the induced draft fan 5 can be cooled down using the common water circulation device.

[0033] After a sudden power outage, water pump 3 and electromagnet 9011 are de-energized. With electromagnet 9011 de-energized, it releases its attraction to top plate 909. At this time, under the pressure of spring 9010, top plate 909 slides to the right (as shown in the image). Figure 4 As shown, during the sliding process of the top plate 909, the two ends of the top plate 909 will push the pry bar 906, causing the pry bar 906 to flip outward with the locking rod 904. In this way, the locking rod 904 will disengage from the ring groove 902. At the moment when the locking rod 904 disengages from the ring groove 902, the spring 903 will press against the stop block 901, causing the stop block 901 to slide to the left with the connecting rod 10 and the valve core 801. At this time, the spacer 802 moves between the water outlet pipe 101 and the water supply pipe 2, so that the emergency pipe 7 is connected to the water supply pipe 2. The emergency pipe 7 will divert water from the tap water network to the water supply pipe 2, which can cool the induced draft fan 5 using the emergency water circulation device, thereby ensuring the normal operation of the induced draft fan 5.

[0034] like Figure 7 As shown, in order to make the action of the top plate 909 pressing against the two pry bars 906 to flip outward more smoothly and stably, rollers 11 are rotatably connected to both ends of the top plate 909, and the two rollers 11 are respectively rolled and connected to the side wall of the pry bar 906 on the same side.

[0035] like Figure 7 As shown, in order to make it easier for the pry bar 906 to drive the locking rod 904 to flip, so that the locking rod 904 can easily disengage from the annular groove 902, the pry bar 906 is longer than the locking rod 904. In this way, by utilizing the lever principle, the longer the pry bar 906 is, the easier it is for the pry bar 906 to drive the locking rod 904 to flip, so that the end of the locking rod 904 can disengage from the inside of the annular groove 902.

[0036] like Figure 5 As shown, when power is restored, in order to drive the valve core 801 to move so as to reset the partition block 802 between the emergency pipe 7 and the water supply pipe 2, thereby disconnecting the emergency pipe 7 from the water supply pipe 2, the end of the valve core 801 away from the connecting rod 10 is connected to the connecting rod 12. The end of the connecting rod 12 passes through the side wall of the three-way valve 8 and is fixedly connected to the handle 13. When power is restored, the electromagnet 9011 is energized. At this time, the top plate 909 is attracted by the electromagnet 9011. At this time, the handle 13 is pulled, and the connecting rod 12 will move the valve core 801 inside the three-way valve 8. At this time, the stop block 901 compresses the spring 903 and moves. When the locking rod 904 is locked inside the annular groove 902, the handle 13 is released. In this way, the partition block 802 will be between the emergency pipe 7 and the water supply pipe 2, so as to connect the water outlet pipe 101 and the water supply pipe 2.

[0037] Example 2

[0038] like Figure 1 , Figure 3As shown, during emergency water circulation cooling, water from the tap water network needs to be introduced. Based on Example 1, in order to drain the introduced tap water, this example provides an overflow pipe 14 on one side of the water tank 1 to drain the introduced tap water. The overflow pipe 14 can drain the introduced tap water. After the emergency pipe 7 introduces tap water into the water supply pipe 2, after cooling the blower 5, the introduced tap water will be guided to the water tank 1 by the return water pipe 4. When the water level in the water tank 1 reaches the overflow pipe 14, the overflow pipe 14 will drain the excess water in the water tank 1. The pipe of the overflow pipe 14 can be introduced into a collection tank to collect the water for other uses, avoiding water overflow in the water tank 1 and wasting water. This achieves the effect of saving water while providing emergency cooling for the blower 5.

[0039] In addition, due to the power outage, the cooling device 15 connected in series on the return water pipe 4 will also stop operating. Therefore, the water flowing back into the water tank 1 from the return water pipe 4 will be hot water. Figure 3 As shown, to minimize the possibility of uncooled hot water entering the water tank 1, the outlet end of the return pipe 4 inserted into the water tank 1 is bent upwards into a vertical position, and the inlet end of the overflow pipe 14 inserted into the water tank 1 is bent downwards into a vertical position. The outlet end of the return pipe 4 is located directly below the inlet end of the overflow pipe 14, with a certain distance between them. A hollow telescopic pipe 16 is slidably connected inside the outlet end of the return pipe 4, and an air bladder 17 is connected to the upper end of the telescopic pipe 16. During normal operation of the water circulation device, the water level in the water tank 1 is at or below the dashed line L2 (e.g., ...). Figure 3 As shown), the return water pipe 4 can normally return water to the inside of the water tank 1, and under normal water circulation device operation, the water level in the water tank 1 remains basically unchanged (except for a small amount of loss, and the water in the water tank 1 should be replenished in time after loss). When the emergency water circulation device is running, tap water flows into the water tank 1 through the return water pipe 4. At the same time, the water level in the water tank 1 rises continuously. At this time, the airbag 17 will move the telescopic pipe 16 upward. When the upper end of the telescopic pipe 16 connects with the inlet pipe of the overflow pipe 14, the water returning in the return water pipe 4 will directly... Water is led out from the overflow pipe 14. In this way, except for the hot water that is cooled and discharged directly into the water tank 1 from the return pipe 4 during the initial operation of the emergency water circulation device, the rest of the water will be discharged directly from the overflow pipe 14, which minimizes the possibility of hot water mixing into the water tank 1. When the normal water circulation device is running again, the water pump 3 starts, and after the water outlet pipe 101 draws out the water in the water tank 1, the water level in the water tank 1 drops. The telescopic pipe 16 moves down with the water level, and the upper end of the telescopic pipe 16 separates from the water inlet end of the overflow pipe 14, thereby ensuring the normal operation of the normal water circulation device.

[0040] The upper end of the overflow pipe 14 is provided with a drain pipe 6, which is vertically fixed to the overflow pipe 14. When the water level in the water tank 1 is higher than the upper end of the drain pipe 6 (the position of the dotted line L1), the water in the water tank 1 is discharged from the drain pipe 6 and the overflow pipe 14.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention without departing from the spirit and scope of the present invention. Any modifications or partial substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A boiler environmentally friendly induced draft fan cooling circulating water system, characterized in that, include: A common water circulation device includes a water tank (1), a water supply pipe (2), a water pump (3), and a return pipe (4). The bottom of the water tank (1) is connected to an outlet pipe (101). The water supply pipe (2) is connected to the outlet pipe (101). The return pipe (4) is connected to the upper part of the water tank (1). A cooling device (15) for cooling the return water in the return pipe (4) is connected in series on the side wall of the return pipe (4). The water supply pipe (2) and the outlet pipe (101) are connected in series. The end of the return water pipe (4) away from the water tank (1) is connected to the induced draft fan (5). A cooling component for cooling the induced draft fan (5) is connected in series between the water supply pipe (2) and the return water pipe (4). The water pump (3) is connected to the water supply pipe (2). When the water pump (3) is started, the water supply pipe (2) draws water from the water tank (1) to the induced draft fan (5) to cool the induced draft fan (5), and the water drawn out flows back to the water tank (1) through the return water pipe (4). Emergency water circulation device, including an emergency pipe (7) connected to the tap water network. The emergency pipe (7) is connected to a three-way valve (8) at its end, and the three-way valve (8) is connected between the outlet pipe (101) and the supply pipe (2). The three-way valve (8) is equipped with a valve core (801) for controlling the outlet pipe (101) and the emergency pipe (7) to alternately connect with the supply pipe (2). One end of the valve core (801) is fixedly connected to a connecting rod (10). The end of the connecting rod (10) passes through the side wall of the three-way valve (8) and is connected to the drive assembly (9). When the drive assembly (9) is energized, the outlet pipe (101) is connected with the supply pipe (2). When the drive assembly (9) is de-energized, the emergency pipe (7) is connected with the supply pipe (2). The drive assembly (9) includes a stop (901), which is fixedly connected to the end of the connecting rod (10). An annular groove (902) is provided on the side wall of the stop (901), and a spring (903) for pressing the stop (901) is sleeved on the connecting rod (10). Two locking rods (904) are symmetrically rotatably connected to the side wall of the three-way valve (8) on both sides of the connecting rod (10) by torsion springs (905). The end of the lever (904) is movably engaged with the side wall of the annular groove (902), and a pry bar (906) is fixedly connected to the side wall of the lever (904). When the two pry bars (906) are flipped outward, the lever (904) and the pry bar (906) are linked together, and the end of the lever (904) is disengaged from the inside of the annular groove (902). The drive assembly (9) also includes a housing (907), which is fixedly installed at the end of the three-way valve (8). The stop block (901) The lever (904) and the lever (904) cover the inside of the housing (907). The inside of the housing (907) is slidably connected to a top plate (909) made of magnetic metal via a guide rod (908). The top plate (909) is located between two pry bars (906), and a spring (9010) for pressing the top plate (909) is sleeved on the guide rod (908). An electromagnet (9011) is fixedly installed on the side wall of the housing (907). When the electromagnet is activated... When the iron (9011) is energized, the electromagnet (9011) attracts the top plate (909). At this time, the second spring (9010) is compressed by the top plate (909). When the electromagnet (9011) is de-energized, the attraction force of the electromagnet (9011) on the top plate (909) disappears. At this time, the second spring (9010) presses the top plate (909) down, causing the top plate (909) to flip outward against the two pry bars (906) to drive the end of the clamp (904) out of the annular groove (902).

2. The boiler environmental protection induced draft fan cooling circulating water system according to claim 1, characterized in that, Both ends of the top plate (909) are rotatably connected to rollers (11), and the two rollers (11) are respectively rotatably connected to the side wall of the pry bar (906) on the same side.

3. The boiler environmental protection induced draft fan cooling circulating water system according to claim 1, characterized in that, The length of the pry bar (906) is longer than that of the locking bar (904).

4. The boiler environmental protection induced draft fan cooling circulating water system according to claim 1, characterized in that, The valve core (801) is connected to a connecting rod (12) at the end away from the connecting rod (10). The end of the connecting rod (12) passes through the side wall of the three-way valve (8) and is fixedly connected to a handle (13).

5. The boiler environmentally friendly induced draft fan cooling circulating water system according to claim 1, characterized in that, The water tank (1) is provided with an overflow pipe (14) on one side, which can discharge the introduced tap water.

6. The boiler environmentally friendly induced draft fan cooling circulating water system according to claim 5, characterized in that, The outlet end of the return water pipe (4) inserted into the water tank (1) is bent upwards and vertical. The inlet end of the overflow pipe (14) inserted into the water tank (1) is bent downwards and vertical. The outlet end of the return water pipe (4) is located directly below the inlet end of the overflow pipe (14). A hollow telescopic pipe (16) is slidably connected inside the outlet end of the return water pipe (4). An airbag (17) is connected to the upper end of the telescopic pipe (16).

7. A boiler environmentally friendly induced draft fan cooling circulating water system according to claim 6, characterized in that, A drain pipe (6) is provided at the upper end of the overflow pipe (14).

Images