Thermal power plant steam turbine drainage heat recovery device

Abstract

The utility model discloses a steam turbine drainage heat recovery device for a thermal power plant, which relates to the technical field of thermal power plant equipment and comprises a sleeving pipeline, a drainage unit and a recovery unit. The dewatering unit comprises a fixed rod frame, a connecting seat, a middle rotating shaft, an impeller, water absorption cloth, a movable pipe wall and a through notch; and the recovery unit is mounted on the left front side of the sleeving pipeline. According to the utility model, liquid water mixed in steam can be effectively separated out and is prevented from influencing the operation of the wheel blades and the turbine, and the rotating speed of the impeller can be dynamically compensated through the waterproof motor, so that the rotating speed of the impeller can be ensured when the flow speed of the steam in the pipeline is insufficient; water drops condensed on the water absorption cloth can obtain enough centrifugal force; and the recycled hot water can be stored, transferred and distributed, so that heat in the hot water is recycled, and the hot water can be intelligently distributed according to the recycling amount of the hot water.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power plant equipment, in particular to a steam turbine drain heat recovery device for a thermal power plant. Background Art

[0002] "Steam engine" is the abbreviation of steam engine and steam turbine. It is a machine that converts thermal energy into mechanical energy. It is mainly used in the fields of electric power industry, aviation and aerospace, ships, etc. It drives the rotor to rotate through the power of water vapor, thereby generating mechanical energy such as electricity. In the electric power industry, the steam engine is one of the core components of the generator set. The existing steam system of steam turbine is often accompanied by the drainage process. Draining refers to the separation of liquid water mixed in the steam in the steam system of the steam turbine to prevent it from affecting the operation of the blades and turbine.

[0003] In the prior art, the heat recovery device for steam turbine drain in thermal power plants has an unreliable drain process, and when draining is performed in a centrifugal manner, the drain effect is affected by the steam flow rate. In addition, the recovery method for the collected hot water is single, and the distribution is not intelligent enough, and good and diverse recycling cannot be achieved. For this reason, we propose a heat recovery device for steam turbine drain in thermal power plants. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a heat recovery device for steam turbine drainage in a thermal power plant. The device has a reliable drainage unit, which can effectively separate liquid water mixed in the steam to prevent it from affecting the operation of the impeller and the turbine, thereby realizing the drainage process of the steam system of the steam turbine. The impeller rotation speed can be dynamically compensated by the waterproof motor to ensure the impeller rotation speed when the steam flow rate in the connecting pipe is insufficient, so that the water droplets condensed on the absorbent cloth can obtain sufficient centrifugal force; the device also has a reliable recovery unit, which can store, transport and distribute the recovered hot water, thereby realizing the recovery and utilization of the heat in the hot water, and can intelligently distribute the hot water according to the recovered amount of hot water, thereby effectively solving the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heat recovery device for steam turbine drain in a thermal power plant, comprising a sleeve pipe, a drain unit and a recovery unit;

[0006] The sleeve pipe is divided into two sections, the lower section of which is fixedly connected with a plug-in pipe port on the lower side, and the upper and lower sections of the sleeve pipe are fixedly connected through four second connection blocks arranged in an outer array;

[0007] The hydrophobic unit comprises a fixed rod frame, a connecting seat, a middle rotating shaft, an impeller, a water-absorbing cloth, a movable pipe wall and a through slot. The inside of the sleeve pipe is fixedly connected with a cross-shaped fixed rod frame, the middle of the cross-shaped fixed rod frame is fixedly connected with a cylindrical connecting seat, the middle rotating shaft passes vertically through the inside of the connecting seat, and the middle rotating shaft is rotatably connected with the connecting seat through an externally mounted bearing, an impeller is fixedly mounted at the lower end of the middle rotating shaft, the leaf plates of the impeller are embedded with water-absorbing cloth, the outer side of the impeller is fixedly connected with an annular movable pipe wall, and a row of through slots is provided on the side where each leaf plate of the impeller is connected to the movable pipe wall;

[0008] Recovery unit: Install the socket on the left front side of the pipe.

[0009] The sleeve pipe is installed into the steam transmission line of the steam turbine of the thermal power plant through the plug-in pipe port on the lower side. The fixed rod frame is used to install the connecting seat. The connecting seat enables the middle rotating shaft and the impeller on the lower side to rotate. When a large amount of steam rises upward, it pushes the rotating impeller. The liquid water mixed in the steam adheres to the absorbent cloth and is thrown out from the through groove on the outer side of the impeller under the action of centrifugal force. It is collected in the annular channel surrounded by the fixed pipe wall and the sleeve pipe, thereby separating the liquid water mixed in the steam to prevent it from affecting the operation of the blades and the turbine, and realizing the drainage process of the steam system of the steam turbine. The recovery unit is used to store, transport and distribute the recovered hot water, thereby realizing the recovery and utilization of the heat in the hot water.

[0010] Furthermore, the hydrophobic unit further comprises a fixing rod and a waterproof motor. The waterproof motor is installed at the upper end of the middle rotating shaft. The waterproof motor is fixedly connected to the inner wall of the sleeve pipe through the outer fixing rod. The output shaft of the waterproof motor faces downward and is fixedly connected to the axis inside the middle rotating shaft. The fixing rod is used for installing the waterproof motor. The waterproof motor is used to provide dynamic compensation when the steam flow rate in the sleeve pipe is insufficient to ensure the rotation speed of the impeller so that the water droplets condensed on the absorbent cloth can obtain sufficient centrifugal force.

[0011] Furthermore, the recovery unit comprises a first connection block, a water storage tank, a solenoid valve 1 and a hot water pipe. The lower left side of the sleeve pipe is fixedly connected with the first connection block, the outer end of the first connection block is fixedly connected with the water storage tank, the lower left side of the water storage tank is fixedly connected with the hot water pipe, and a solenoid valve 1 is installed at the connection between the hot water pipe and the water storage tank. The first connection block is used for fixed connection between the water storage tank and the sleeve pipe, the water storage tank stores the recovered hot water, the solenoid valve 1 is used to control the opening and closing of the hot water pipe, and the hot water pipe is used to connect the hot water distribution pipeline to utilize the hot water.

[0012] Furthermore, the recovery unit also includes solenoid valve 2, a gas supply steel pipe, a steamer, a heater and a PLC controller. Solenoid valve 2 is installed on the front side of the water storage tank, and the left front side of the sleeve pipe is fixedly connected to the gas supply steel pipe. The steamer is fixedly connected to the outer port of the gas supply steel pipe and is connected to the interior of the sleeve pipe through the gas supply steel pipe. The output port of solenoid valve 2 is connected to the interior of the steamer through a connecting pipe. A heater is fixedly installed on the lower side of the steamer. The solenoid valve 1, solenoid valve 2 and the heater are electrically connected to the output end of the external power supply through the PLC controller on the outside of the water storage tank. The gas transmission steel pipe is used for the installation of the steamer, and after the heater reheats the hot water flowing into the steamer, the generated steam is re-introduced into the sleeve pipe to achieve another recovery and utilization of the drain heat, and has a positive supplementary effect on the steam flow in the sleeve pipe. Solenoid valve 2 is used to control the opening and closing of the pipeline connected to the steamer. The PLC controller intelligently controls solenoid valve 1 and solenoid valve 2. When the recovered hot water is less, solenoid valve 2 is opened first to distribute the hot water to the steamer. When the amount of recovered hot water is sufficient, solenoid valve 1 and solenoid valve 2 are opened at the same time. While meeting the hot water supply, a part of the hot water is distributed to the steamer.

[0013] Furthermore, it also includes a fixed pipe wall, which is embedded and installed between the upper and lower sleeve pipes, and the fixed pipe wall and the movable pipe wall form an annular channel, and the movable pipe wall is rotatably connected to the fixed pipe wall, and a sealing ring is provided at the connection. The fixed pipe wall is used to form an annular channel for collecting hot water with the movable pipe wall, and the fixed pipe wall facilitates the installation of components such as a water pump.

[0014] Furthermore, it also includes a water pump and a water delivery pipe. The water pump is installed at the second connecting block on the left side. The water inlet of the water pump is connected to the annular channel surrounded by the fixed pipe wall and the sleeve pipe, and the water outlet of the water pump is connected to the inside of the water storage tank through the water delivery pipe. The water pump is used to extract the hot water collected in the annular channel and deliver it to the water storage tank along the water delivery pipe.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the heat recovery device for steam turbine drain in thermal power plant has the following advantages:

[0016] 1. It has a reliable drainage unit, which can effectively separate the liquid water mixed in the steam to prevent it from affecting the operation of the impeller and turbine, and realize the drainage process of the steam system of the steam turbine. It also has a dynamic compensation device, which can provide dynamic compensation when the steam flow rate in the sleeve pipe is insufficient, and ensure the speed of the impeller, so that the water droplets condensed on the absorbent cloth can obtain sufficient centrifugal force;

[0017] 2. It has a reliable recovery unit that can store, transport and distribute the recovered hot water, thereby recycling the heat in the hot water and intelligently distribute the hot water according to the amount of hot water recovered;

[0018] 3. The utility model has a reliable drainage unit, which can effectively separate the liquid water mixed in the steam to prevent it from affecting the operation of the impeller and the turbine, and realize the drainage process of the steam system of the steam turbine. The impeller rotation speed can be dynamically compensated through the waterproof motor to ensure the impeller rotation speed when the steam flow rate in the connecting pipe is insufficient, so that the water droplets condensed on the absorbent cloth can obtain sufficient centrifugal force; it also has a reliable recovery unit, which can store, transport and distribute the recovered hot water, thereby realizing the recovery and utilization of the heat in the hot water, and can intelligently distribute the hot water according to the recovery amount of hot water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the upper and left side structures of the utility model;

[0021] Figure 3 It is a schematic diagram of the partial structure of the lower side of the utility model;

[0022] Figure 4 For this utility model Figure 3 A magnified view of the structure at center;

[0023] Figure 5 It is a partial cross-sectional view of the utility model.

[0024] In the figure: 1 sleeve pipe, 2 plug-in pipe port, 3 drain unit, 31 fixed rod frame, 32 connecting seat, 33 middle rotating shaft, 34 impeller, 35 absorbent cloth, 36 movable pipe wall, 37 fixed rod, 38 waterproof motor, 39 through slot, 4 recovery unit, 41 first connecting block, 42 ​​water storage tank, 43 solenoid valve 1, 44 hot water pipeline, 45 solenoid valve 2, 46 gas transmission steel pipe, 47 steam box, 48 heater, 49 PLC controller, 5 fixed pipe wall, 6 second connecting block, 7 water pump, 8 water transmission pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-Figure 5 , This embodiment provides a technical solution: a heat recovery device for steam turbine drain in a thermal power plant, comprising a sleeve pipe 1, a drain unit 3 and a recovery unit 4;

[0027] The sleeve pipe 1 is divided into two sections, the lower section of the sleeve pipe 1, and the lower side of the lower section of the sleeve pipe 1 is fixedly connected with a plug-in pipe port 2. The upper and lower sections of the sleeve pipe 1 are fixedly connected by four second connection blocks 6 arranged in an outer array;

[0028] The hydrophobic unit 3 comprises a fixed rod frame 31, a connecting seat 32, a middle rotating shaft 33, an impeller 34, a water-absorbing cloth 35, a movable pipe wall 36 and a through slot 39. The inside of the sleeve pipe 1 is fixedly connected with a cross-shaped fixed rod frame 31, the middle part of the cross-shaped fixed rod frame 31 is fixedly connected with a cylindrical connecting seat 32, the middle rotating shaft 33 passes vertically through the inside of the connecting seat 32, and the middle rotating shaft 33 is rotatably connected with the connecting seat 32 through an externally mounted bearing, the lower end of the middle rotating shaft 33 is fixedly mounted with an impeller 34, the leaf plates of the impeller 34 are all embedded with water-absorbing cloth 35, the outer side of the impeller 34 is fixedly connected with an annular movable pipe wall 36, and a row of through slots 39 is provided on the side where each leaf plate of the impeller 34 is connected to the movable pipe wall 36;

[0029] Recovery unit 4: Install the left front side of the sleeve pipe 1.

[0030] The sleeve pipe 1 is installed into the steam transmission line of the steam turbine of the thermal power plant through the plug-in pipe port 2 on the lower side. The fixed rod frame 31 is used to install the connecting seat 32. The connecting seat 32 enables the middle rotating shaft 33 and the impeller 34 on the lower side to rotate. When a large amount of steam rises upward, it pushes the rotating impeller 34. The liquid water mixed in the steam adheres to the absorbent cloth 35 and is thrown out from the through groove 39 on the outer side of the impeller 34 under the action of centrifugal force. It is collected in the annular channel surrounded by the fixed pipe wall 5 and the sleeve pipe 1, so that the liquid water mixed in the steam is separated to prevent it from affecting the operation of the blades and the turbine, and realize the drainage process of the steam system of the steam turbine. The recovery unit 4 is used to store, transport and distribute the recovered hot water, so as to realize the recovery and utilization of the heat in the hot water.

[0031] The water-repellent unit 3 further comprises a fixing rod 37 and a waterproof motor 38. The waterproof motor 38 is installed at the upper end of the middle rotating shaft 33. The waterproof motor 38 is fixedly connected to the inner wall of the sleeve pipe 1 through the outer fixing rod 37. The output shaft of the waterproof motor 38 faces downward and is fixedly connected to the axis inside the middle rotating shaft 33. The fixing rod 37 is used for the installation of the waterproof motor 38. The waterproof motor 38 is used to provide dynamic compensation when the steam flow rate in the sleeve pipe 1 is insufficient, to ensure the rotation speed of the impeller 34, so that the water droplets condensed on the water-absorbing cloth 35 can obtain sufficient centrifugal force.

[0032] The recovery unit 4 comprises a first connection block 41, a water storage tank 42, a solenoid valve 43 and a hot water pipe 44. The first connection block 41 is fixedly connected to the lower left side of the sleeve pipe 1, the outer end of the first connection block 41 is fixedly connected to the water storage tank 42, the lower left side of the water storage tank 42 is fixedly connected to the hot water pipe 44, and a solenoid valve 43 is installed at the connection between the hot water pipe 44 and the water storage tank 42. The first connection block 41 is used for fixed connection between the water storage tank 42 and the sleeve pipe 1, the water storage tank 42 stores the recovered hot water, the solenoid valve 43 is used to control the opening and closing of the hot water pipe 44, and the hot water pipe 44 is used to connect the hot water distribution pipeline to utilize the hot water.

[0033] The recovery unit 4 also includes a solenoid valve 45, a gas steel pipe 46, a steamer 47, a heater 48 and a PLC controller 49. The solenoid valve 45 is installed on the front side of the water tank 42, and the gas steel pipe 46 is fixedly connected to the left front side of the sleeve pipe 1. The steamer 47 is fixedly connected to the outer port of the gas steel pipe 46, and is connected to the interior of the sleeve pipe 1 through the gas steel pipe 46. The output port of the solenoid valve 45 is connected to the interior of the steamer 47 through a connecting pipe. A heater 48 is fixedly installed on the lower side of the steamer 47. The solenoid valve 43, the solenoid valve 45 and the heater 48 are all electrically connected to the output end of the external power supply through the PLC controller 49 on the outside of the water tank 42. The gas transmission steel pipe 46 is used for the installation of the steamer 47, and after the heater 48 reheats the hot water flowing into the steamer 47, the generated steam is re-introduced into the sleeve pipe 1 to achieve another recovery and utilization of the hydrophobic heat, and has a positive supplementary effect on the steam flow in the sleeve pipe 1, the solenoid valve 2 45 is used to control the opening and closing of the pipeline connected to the steamer 47, and the PLC controller 49 intelligently controls the solenoid valve 1 43 and the solenoid valve 2 45. When the recovered hot water is less, the solenoid valve 2 45 is opened first to distribute the hot water to the steamer 47. When the amount of recovered hot water is sufficient, the solenoid valve 1 43 and the solenoid valve 2 45 are opened at the same time, and while meeting the hot water supply, a part of the hot water is distributed to the steamer 47.

[0034] The fixed pipe wall 5 is also included. The fixed pipe wall 5 is embedded and installed between the upper and lower sleeve pipes 1. The fixed pipe wall 5 and the movable pipe wall 36 form an annular channel. The movable pipe wall 36 is rotatably connected to the fixed pipe wall 5, and a sealing ring is provided at the connection. The fixed pipe wall 5 is used to form an annular channel for collecting hot water with the movable pipe wall 36, and the fixed pipe wall facilitates the installation of components such as the water pump 7.

[0035] It also includes a water pump 7 and a water pipe 8. The water pump 7 is installed at the second connecting block 6 on the left side. The water inlet of the water pump 7 is connected to the annular channel surrounded by the fixed pipe wall 5 and the sleeve pipe 1. The water outlet of the water pump 7 is connected to the inside of the water storage tank 42 through the water pipe 8. The water pump 7 is used to extract the hot water collected in the annular channel and transport it to the water storage tank 42 along the water pipe 8.

[0036] The working principle of the heat recovery device for steam turbine drain in a thermal power plant provided by the utility model is as follows: a sleeve pipe 1 is installed into the steam transmission line of the steam turbine in the thermal power plant through the plug-in pipe port 2 on the lower side, a fixed rod frame 31 is used for installing a connecting seat 32, and the connecting seat 32 enables the middle rotating shaft 33 and the impeller 34 on the lower side to rotate. When a large amount of steam rises upward, it drives the rotating impeller 34, and the liquid water mixed in the steam adheres to the absorbent cloth 35, and under the action of centrifugal force, it is discharged from the passage outside the impeller 34. The notch 39 is thrown outward and collected in the annular channel surrounded by the fixed pipe wall 5 and the sleeve pipe 1, thereby separating the liquid water mixed in the steam to prevent it from affecting the operation of the impeller and the turbine, thereby realizing the drainage process of the steam system of the steam turbine; the fixed rod 37 is used for the installation of the waterproof motor 38, and the waterproof motor 38 is used to provide dynamic compensation when the steam flow rate in the sleeve pipe 1 is insufficient, so as to ensure the rotation speed of the impeller 34, so that the water droplets condensed on the absorbent cloth 35 can obtain sufficient centrifugal force. The first connecting block 41 is used for fixed connection between the water tank 42 and the sleeve pipe 1. The water pump 7 is used to extract the hot water collected in the annular channel and transport it to the water tank 42 along the water pipe 8. The water tank 42 stores the recovered hot water. The solenoid valve 43 is used to control the opening and closing of the hot water pipe 44. The hot water pipe 44 is used to connect the hot water distribution pipeline to use the hot water. The gas transmission steel pipe 46 is used for the installation of the steam box 47. After the heater 48 reheats the hot water flowing into the steam box 47, the generated steam is re-introduced into the sleeve pipe 1. In the pipe 1, in order to realize another kind of recycling and utilization of the heat of drainage, and to have a positive supplementary effect on the steam flow in the sleeve pipe 1, the solenoid valve 2 45 is used to control the opening and closing of the pipeline connected to the steam box 47, and the PLC controller 49 intelligently controls the solenoid valve 1 43 and the solenoid valve 2 45. When the recovered hot water is less, the solenoid valve 2 45 is opened first to distribute the hot water to the steam box 47. When the amount of recovered hot water is sufficient, the solenoid valve 1 43 and the solenoid valve 2 45 are opened at the same time. While meeting the hot water supply, a part of the hot water is distributed to the steam box 47.

[0037] It is worth noting that the input end of the waterproof motor 38 and the water pump 7 disclosed in the above embodiments is electrically connected to the output end of the external power supply through an external control switch group, and the external control switch group controls the operation of the waterproof motor 38 and the water pump 7, and the PLC controller 49 controls the operation of the solenoid valve 1 43, the solenoid valve 2 45 and the heater 48 using methods commonly used in the prior art.

[0038] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A heat recovery device for steam turbine drain in a thermal power plant, characterized in that: It comprises a sleeve pipe (1), a drain unit (3) and a recovery unit (4); The sleeve pipe (1) is divided into two sections, the lower section of the sleeve pipe (1), and the lower side of the lower section of the sleeve pipe (1) is fixedly connected with a plug-in pipe port (2). The upper and lower sections of the sleeve pipe (1) are fixedly connected via four second connection blocks (6) arranged in an outer array; The drain unit (3) comprises a fixed rod frame (31), a connecting seat (32), a middle rotating shaft (33), an impeller (34), a water-absorbing cloth (35), a movable pipe wall (36) and a through slot (39). The interior of the sleeve pipe (1) is fixedly connected with a cross-shaped fixed rod frame (31), the middle of the cross-shaped fixed rod frame (31) is fixedly connected with a cylindrical connecting seat (32), and the middle rotating shaft (33) is vertically extended from the inside of the connecting seat (32). The middle rotating shaft (33) is rotatably connected to the connecting seat (32) through an externally mounted bearing, an impeller (34) is fixedly mounted on the lower end of the middle rotating shaft (33), a water-absorbing cloth (35) is embedded in the leaf plates of the impeller (34), an annular movable pipe wall (36) is fixedly connected to the outer side of the impeller (34), and a row of through slots (39) is provided on the side where each leaf plate of the impeller (34) is connected to the movable pipe wall (36); Recovery unit (4): Install the left front side of the socket pipe (1).

2. A thermal power plant steam turbine drain heat recovery device according to claim 1, characterized in that: The hydrophobic unit (3) further comprises a fixing rod (37) and a waterproof motor (38). The waterproof motor (38) is installed at the upper end of the middle rotating shaft (33). The waterproof motor (38) is fixedly connected to the inner wall of the sleeve pipe (1) through the outer fixing rod (37). The output shaft of the waterproof motor (38) faces downward and is fixedly connected to the axis inside the middle rotating shaft (33).

3. A thermal power plant steam turbine drain heat recovery device according to claim 1, characterized in that: The recovery unit (4) comprises a first connection block (41), a water storage tank (42), a solenoid valve (43) and a hot water pipe (44); the first connection block (41) is fixedly connected to the lower left side of the sleeve pipe (1); the outer end of the first connection block (41) is fixedly connected to the water storage tank (42); the lower left side of the water storage tank (42) is fixedly connected to the hot water pipe (44); and a solenoid valve (43) is installed at the connection between the hot water pipe (44) and the water storage tank (42).

4. A thermal power plant steam turbine drain heat recovery device according to claim 3, characterized in that: The recovery unit (4) further comprises a second solenoid valve (45), a gas delivery steel pipe (46), a steamer (47), a heater (48) and a PLC controller (49). The second solenoid valve (45) is installed on the front side of the water storage tank (42). The left front side of the sleeve pipe (1) is fixedly connected to the gas delivery steel pipe (46). The steamer (47) is fixedly connected to the outer end of the gas delivery steel pipe (46) and is connected to the inside of the sleeve pipe (1) through the gas delivery steel pipe (46). The output port of the second solenoid valve (45) is connected to the inside of the steamer (47) through a connecting pipe. The lower side of the steamer (47) is fixedly installed with a heater (48). The first solenoid valve (43), the second solenoid valve (45) and the heater (48) are all electrically connected to the output end of an external power supply through the PLC controller (49) outside the water storage tank (42).

5. The heat recovery device for steam turbine drain in a thermal power plant according to claim 1, characterized in that: It also comprises a fixed pipe wall (5), which is embedded and installed between the upper and lower sections of the sleeve pipe (1), and the fixed pipe wall (5) and the movable pipe wall (36) form an annular channel. The movable pipe wall (36) is rotatably connected to the fixed pipe wall (5), and a sealing ring is provided at the connection.

6. A thermal power plant steam turbine drain heat recovery device according to claim 5, characterized in that: It also includes a water pump (7) and a water pipe (8), wherein the water pump (7) is installed at the second connecting block (6) on the left side, the water inlet of the water pump (7) is connected to the annular channel surrounded by the fixed pipe wall (5) and the sleeve pipe (1), and the water outlet of the water pump (7) is connected to the inside of the water storage tank (42) through the water pipe (8).

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