A medium-pressure feed water pump for a combined cycle unit

Abstract

The utility model relates to the field of energy and electric power industry especially relates to a combined cycle unit medium pressure feed water pump, the combined cycle unit medium pressure feed water pump includes water pump body, first filter screen, second filter screen, flat adsorption pipe, arc brush, cleaning component and blow-off pipe, one side of water pump body is equipped with filter cartridge, the top of filter cartridge is connected with water inlet pipe, the bottom of filter cartridge is connected with water outlet pipe, the bottom of filter cartridge is installed with support frame, the inside of filter cartridge is installed with first filter screen close to the one end of water inlet pipe, the one end of first filter screen away from water inlet pipe is installed with second filter screen, the combined cycle unit medium pressure feed water pump provided by the utility model through the design of cleaning component, including motor, transmission rod, flow guide pipe and cleaning brush etc.

Description

Technical Field

[0001] This utility model relates to the energy and power industry, and in particular to a medium-pressure feedwater pump for a combined cycle unit. Background Technology

[0002] Combined cycle units, also known as hybrid cycle or combined cycle, are a type of unit that uses multiple thermodynamic cycles in series to achieve higher thermal efficiency. In the power generation industry, combined cycle units typically use fuels such as natural gas, converting the chemical energy of the fuel into electrical energy through a series of thermodynamic processes. As an important component of a combined cycle unit, the medium-pressure feedwater pump's main function is to pressurize water in the medium-pressure feedwater system and deliver it to where it is needed, such as in boilers or other heat exchange equipment. If water enters the feedwater pump directly without effective treatment, impurities (such as particulate matter and suspended solids) will cause severe wear and corrosion to the pump's internal parts. Over time, this will not only reduce the performance of the feedwater pump and shorten its service life, but may also cause equipment failure and affect the stable operation of the entire combined cycle unit. However, in traditional medium-pressure water supply pump systems, the water source often lacks efficient and reliable filtration measures before entering the pump. Some systems may only use simple filter screens or sieves for filtration, but these filtration methods have limited effectiveness and cannot effectively remove impurities from the water. Over time, a large amount of impurities accumulate on the filter screen, leading to a decrease in filtration efficiency and even clogging of the filter screen, increasing the operating load and energy consumption of the water supply pump. In addition, these accumulated impurities need to be cleaned manually and regularly, which not only increases maintenance costs but also poses safety risks, as the cleaning process may involve contact with high-pressure water and harmful substances.

[0003] Therefore, it is necessary to provide a new medium-pressure feedwater pump for combined cycle units to solve the above-mentioned technical problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a medium-pressure feedwater pump for a combined cycle unit.

[0005] The medium-pressure feedwater pump for the combined circulation unit provided by this utility model includes: a pump body, a first filter screen, a second filter screen, flat adsorption tubes, arc-shaped brushes, a cleaning component, and a drain pipe. A filter cylinder is provided on one side of the pump body. The top of the filter cylinder is connected to an inlet pipe, and the bottom of the filter cylinder is connected to an outlet pipe. A support frame is installed at the bottom of the filter cylinder. The first filter screen is installed at the end of the filter cylinder near the inlet pipe, and the second filter screen is installed at the end of the first filter screen away from the inlet pipe. Several flat adsorption tubes are evenly spaced inside the second filter screen. A cleaning brush is installed on one side of each of the flat adsorption tubes. Arc-shaped brushes are symmetrically arranged on the outer wall of the first filter screen. A cleaning component is installed inside the filter cylinder. The cleaning component is used to clean the impurities intercepted by the first and second filter screens inside the filter cylinder. Several drain pipes are connected to the bottom of the filter cylinder, and one end of each drain pipe is connected to a sludge collection tank.

[0006] Preferably, the cleaning component includes: a motor, a transmission rod, and a guide tube. The motor is fixedly connected to the top of the support frame, the transmission rod is fixedly connected to the output end of the motor, and the guide tube is fixedly connected to the middle of the transmission rod. The guide tube is connected to several of the flat adsorption tubes.

[0007] Preferably, the filter cylinder is symmetrically connected to a reciprocating screw at one end near the water inlet pipe. The transmission rod and the two reciprocating screws are fixedly connected to a sprocket at one end extending out of the filter cylinder. Several sprockets are connected by chain drive. A slider is installed at the end of the two reciprocating screws away from the sprocket. The two sliders are fixedly connected to a corresponding arc-shaped brush.

[0008] Preferably, the diameter of the filter pores of the first filter screen is larger than the diameter of the filter pores of the second filter screen.

[0009] Preferably, a rotary valve is rotatably connected inside each of the plurality of sewage pipes, and a gear is fixedly connected to one end of each of the plurality of rotary valves extending out of the outer wall of the corresponding sewage pipe.

[0010] Preferably, an electric push rod is fixedly connected to the top of the support frame near the motor, and a rack is fixedly connected to the output end of the electric push rod, the rack meshing with several of the gears.

[0011] Preferably, the bristles on one side of the cleaning brush are in contact with the inner wall of the second filter, and the bristles on the inner walls of the two arc-shaped brushes are in contact with the outer wall of the first filter.

[0012] Preferably, the rack is fitted with a protective cover.

[0013] Compared with related technologies, the medium-pressure feedwater pump for the combined cycle unit provided by this utility model has the following beneficial effects: High-efficiency filtration and impurity interception: By setting up a first filter and a second filter, the water source is initially and further filtered. The first filter intercepts large particles of impurities, while the second filter effectively removes fine impurities. This multi-stage filtration mechanism significantly improves filtration efficiency and ensures that the water entering the water pump is clean. Automated cleaning and maintenance: By designing the cleaning components, including a motor, transmission rod, guide tube, and cleaning brush, when impurities accumulate inside the second filter and the pressure difference reaches a preset value, the motor starts, driving the transmission rod and guide tube to rotate. At the same time, the cleaning brush and arc brush start working to automatically remove impurities from the filter. This automated cleaning mechanism not only reduces the frequency and cost of manual maintenance but also improves the safety and reliability of the equipment. Intelligent sewage discharge and collection: By setting up a drain pipe and a rotary valve, along with a matching electric push rod and rack mechanism, when the cleaning mechanism is activated, the rotary valve opens, allowing impurities and water to be discharged through the drain pipe and collected in the sludge collection tank. This intelligent drain mechanism ensures the effective removal of impurities while preventing the waste of water resources. The rack is equipped with a protective cover to protect it from interference and damage from the external environment. Improve equipment performance and extend its service life: Thanks to the adoption of a high-efficiency filtration and automatic cleaning mechanism, the wear and corrosion of the internal parts of the water pump caused by impurities can be significantly reduced, thereby improving the performance and stability of the equipment. At the same time, this design also extends the service life of the water pump and reduces downtime and maintenance costs caused by equipment failure. Energy reduction and environmental benefits: Traditional medium-pressure water supply pump systems often experience increased operating load and energy consumption due to filter clogging. However, this water supply pump effectively avoids filter clogging through high-efficiency filtration and an automated cleaning mechanism, thereby reducing energy consumption. In addition, the intelligent sewage discharge mechanism reduces water waste, which aligns with environmental protection principles. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of the medium-pressure feedwater pump for the combined cycle unit provided by this utility model; Figure 2 for Figure 1 The diagram shows a cross-sectional view of the filter cartridge. Figure 3 for Figure 2 The diagram shows the structure of the sewage pipe. Figure 4 for Figure 2 The diagram shows a cross-sectional view of the second filter screen.

[0015] The following are the labels in the diagram: 1. Water pump body; 2. Filter cartridge; 21. Inlet pipe; 22. Outlet pipe; 23. Support frame; 3. First filter screen; 4. Second filter screen; 5. Flat adsorption tube; 6. Cleaning brush; 7. Arc brush; 8. Sewage pipe; 9. Sewage collection box; 10. Motor; 11. Transmission rod; 12. Guide pipe; 13. Reciprocating screw; 14. Sprocket; 15. Slider; 16. Rotary valve; 17. Gear; 18. Electric push rod; 19. Rack. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0018] Please see Figures 1 to 4 A medium-pressure feedwater pump for a combined cycle unit, comprising: a pump body 1, a first filter screen 3, a second filter screen 4, flat adsorption tubes 5, an arc-shaped brush 7, a cleaning assembly, and a drain pipe 8. A filter cylinder 2 is provided on one side of the pump body 1. An inlet pipe 21 is connected to the top of the filter cylinder 2, and an outlet pipe 22 is connected to the bottom of the filter cylinder 2. A support frame 23 is installed at the bottom of the filter cylinder 2. The first filter screen 3 is installed inside the filter cylinder 2 near the inlet pipe 21, and the second filter screen 4 is installed at the end of the first filter screen 3 away from the inlet pipe 21. A plurality of flat adsorption tubes 5 are equidistantly arranged inside the second filter screen 4. A cleaning brush 6 is installed on one side of the tube 5. Arc-shaped brushes 7 are symmetrically arranged on the outer wall of the first filter screen 3. A cleaning component is installed inside the filter cylinder 2. The cleaning component is used to clean the impurities intercepted by the first filter screen 3 and the second filter screen 4 inside the filter cylinder 2. Several drain pipes 8 are connected to the bottom of the filter cylinder 2. One end of the drain pipes 8 is connected to a sludge collection box 9. The cleaning component includes: a motor 10, a transmission rod 11 and a guide pipe 12. The motor 10 is fixedly connected to the top of the support frame 23. The output end of the motor 10 is fixedly connected to the transmission rod 11. The middle part of the transmission rod 11 is fixedly connected to the guide pipe 12. The guide pipe 12 is connected to several flat adsorption tubes 5.

[0019] It should be noted that: after the water source is filtered by the filter cartridge 2, it is connected to the water pump body 1 through the outlet pipe 22 and enters its interior. The water pump body 1 uses an impeller on the internal rapidly rotating shaft to accelerate the flow of water along the rotation direction of the impeller, increasing its kinetic energy. When the liquid water passes through the impeller, the outer edge of the impeller is close to the pump casing, so that the water is subjected to outward centrifugal force, thereby increasing its pressure and speed. As the impeller rotates, the liquid is compressed in the pump casing, forming a high-pressure water flow, and flows out through the outlet pipe to water-using equipment such as boilers. The flat adsorption tubes 5 are evenly distributed on the outer wall of the guide tube 12. When the guide tube 12 rotates once, the flat adsorption tubes 5 can cover the inner wall of the first filter screen 3.

[0020] Please see Figure 2 and Figure 4 The filter cylinder 2 is symmetrically connected to a reciprocating screw 13 at one end near the water inlet pipe 21. The transmission rod 11 and the two reciprocating screws 13 are fixedly connected to a sprocket 14 at the end extending out of the filter cylinder 2. Several sprockets 14 are connected by chain drive. The two reciprocating screws 13 are fitted with a slider 15 at the end away from the sprocket 14. The two sliders 15 are fixedly connected to the corresponding arc-shaped brush 7. The filter hole diameter of the first filter screen 3 is larger than the filter hole diameter of the second filter screen 4. It should be noted that: the first filter screen 3 has filter holes in the middle and solid ends. The bottom of the filter cylinder 2 and the corresponding positions at both ends of the first filter screen 3 are connected to the drain pipe 8. When the arc brush 7 moves to the solid parts at both ends of the first filter screen 3, large particles of impurities are discharged through the drain pipe 8 at its bottom. Please see Figure 3 and Figure 4 Rotary valves 16 are rotatably connected inside the drain pipes 8. Gears 17 are fixedly connected to one end of each of the rotary valves 16, which extends out of the outer wall of the corresponding drain pipe 8. An electric push rod 18 is fixedly connected to the top of the support frame 23 near the motor 10. A rack 19 is fixedly connected to the output end of the electric push rod 18. The rack 19 meshes with the gears 17. The bristles on one side of the cleaning brush 6 are in contact with the inner wall of the second filter screen 4. The bristles on the inner wall of the two arc-shaped brushes 7 are in contact with the outer wall of the first filter screen 3. A protective cover is installed on the outside of the rack 19. It should be noted that the distance that the electric push rod 18 moves the rack 19 causes the rotary valve 16 to rotate 90 degrees, thereby opening the drain pipe 8 and allowing impurities and water to flow into the sludge collection tank 9.

[0021] The working principle of the medium-pressure feedwater pump for the combined cycle unit provided by this utility model is as follows: Water intake and initial filtration: The water source first enters the filter cylinder 2 through the water inlet pipe 21. After entering the filter cylinder 2, the water first encounters the first filter screen 3. Since the filter hole diameter of the first filter screen 3 is relatively large, it mainly intercepts large particles of impurities. These impurities are blocked on the outer wall of the first filter screen 3. The water that has undergone preliminary filtration continues to flow into the interior of the first filter screen 3. The first filter screen 3 is connected to the second filter screen 4. After the water enters the second filter screen 4, due to the small diameter of the filter holes in the second filter screen 4, it can effectively intercept small impurities in the water. These impurities are retained inside the second filter screen 4. At this time, the flat adsorption tube 5 and the guide tube 12 inside the second filter screen 4 are filled with water that has undergone preliminary filtration, and the rotary valve 16 inside the drain pipe 8 is in the closed state. After being further filtered by the second filter screen 4, the water becomes relatively clean and then flows into the water pump body 1 through the outlet pipe 22; Water pump pressurization and delivery: Inside the pump body 1, the impeller rotates at high speed to pressurize the filtered water, and the pressurized water is then transported to equipment that needs water, such as boilers. Impurity accumulation and pressure differential formation: As time goes by, impurities accumulate inside the second filter 4, causing a pressure difference to form between its inner and outer walls. When this pressure difference reaches a preset value, the control system will trigger a cleaning mechanism. Cleaning mechanism activated: When the motor 10 starts, the transmission rod 11 fixedly connected to its output end begins to rotate. At the same time, the electric push rod 18 starts, driving the rack 19 fixedly connected to its output end to move. The rack 19 meshes with the gear 17 at one end of several rotary valves 16, thereby driving the rotary valves 16 to rotate and open, allowing impurities and water to be discharged through the drain pipe 8. At the same time, the guide tube 12 fixed in the middle of the transmission rod 11 begins to rotate, and the flat adsorption tube 5 connected to its outer wall also rotates. The cleaning brush 6 on one side of the flat adsorption tube 5 is attached to the inner wall of the second filter screen 4 and continues to rotate with the flat adsorption tube 5, brushing up the impurities on the inner wall of the second filter screen 4. Due to the water pressure, the brushed impurities and water enter the guide tube 12 through the flat adsorption tube 5 and enter the sludge collection box 9 through the sewage pipe 8. At the same time, the sprocket 14 fixedly connected to the end of the transmission rod 11 near the water inlet pipe 21 also begins to rotate. The reciprocating screw 13 symmetrically connected to the end of the filter cylinder 2 near the water inlet pipe 21 extends out of the outer wall of the filter cylinder 2 and is fixedly connected to the sprocket 14. It rotates synchronously with the transmission rod 11 through chain drive. The slider 15 installed on the reciprocating screw 13 drives the arc brush 7 to start reciprocating on the outer wall of the first filter screen 3. The bristles on the inner wall of the arc brush 7 are in contact with the outer wall of the first filter screen 3, brushing away the large particles of impurities on its outer wall. When the arc brush 7 moves to both ends of the first filter screen 3, the brushed large particles of impurities will be discharged through the corresponding drain pipe 8 at the bottom of the filter cylinder 2 and flow into the sludge collection box 9.

[0022] Cleaning completion and restoration work: When the cleaning process is completed, the control system will shut off the motor 10 and the electric push rod 18. At this time, the transmission rod 11 stops rotating, and the rack 19 moves in the opposite direction as the electric push rod 18 closes. This causes the rotary valve 16 inside the drain pipe 8 to rotate in the opposite direction to close the drain pipe 8, preventing water from continuing to flow out. The water pump body 1 continues to provide pressurized water to water-using equipment such as boilers.

[0023] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A medium-pressure feedwater pump for a combined cycle unit, characterized in that, include: The pump body (1) has a filter cylinder (2) on one side. The top of the filter cylinder (2) is connected to the water inlet pipe (21), the bottom of the filter cylinder (2) is connected to the water outlet pipe (22), and the bottom of the filter cylinder (2) is equipped with a support frame (23). The first filter screen (3) is installed inside the filter cylinder (2) at one end near the water inlet pipe (21); The second filter (4) is installed at the end of the first filter (3) away from the water inlet pipe (21); Flat adsorption tubes (5), a plurality of flat adsorption tubes (5) are equidistantly arranged inside the second filter screen (4), and a cleaning brush (6) is installed on one side of the plurality of flat adsorption tubes (5). Arc-shaped brush (7): Arc-shaped brushes (7) are symmetrically provided on the outer wall of the first filter screen (3); The cleaning component is installed inside the filter cartridge (2). The cleaning component is used to clean the impurities that are intercepted by the first filter screen (3) and the second filter screen (4) inside the filter cartridge (2). The bottom of the filter cylinder (2) is connected to a number of drain pipes (8), and one end of each drain pipe (8) is connected to a sludge collection box (9).

2. The medium-pressure feedwater pump for a combined cycle unit according to claim 1, characterized in that, The cleaning assembly includes a motor (10), the top of the support frame (23) is fixedly connected to the motor (10), the output end of the motor (10) is fixedly connected to the transmission rod (11), the middle part of the transmission rod (11) is fixedly connected to the guide tube (12), and the guide tube (12) is connected to several of the flat adsorption tubes (5).

3. The medium-pressure feedwater pump for a combined cycle unit according to claim 2, characterized in that, The filter cylinder (2) is symmetrically connected to a reciprocating screw (13) at one end near the water inlet pipe (21). The transmission rod (11) and the two reciprocating screws (13) are fixedly connected to a sprocket (14) at one end extending out of the filter cylinder (2). Several sprockets (14) are connected by chain drive. The two reciprocating screws (13) are fitted with a slider (15) at the end away from the sprocket (14). The two sliders (15) are fixedly connected to the corresponding arc-shaped brush (7).

4. The medium-pressure feedwater pump for a combined cycle unit according to claim 1, characterized in that, The diameter of the filter holes in the first filter screen (3) is larger than that in the second filter screen (4).

5. The medium-pressure feedwater pump for a combined cycle unit according to claim 1, characterized in that, Rotary valves (16) are rotatably connected inside the sewage pipes (8), and gears (17) are fixedly connected to one end of each of the rotary valves (16) extending out of the outer wall of the corresponding sewage pipe (8).

6. The medium-pressure feedwater pump for a combined cycle unit according to claim 5, characterized in that, An electric push rod (18) is fixedly connected to the top of the support frame (23) near the motor (10). A rack (19) is fixedly connected to the output end of the electric push rod (18). The rack (19) meshes with several of the gears (17).

7. The medium-pressure feedwater pump for a combined cycle unit according to claim 1, characterized in that, The bristles on one side of the cleaning brush (6) are in contact with the inner wall of the second filter (4), and the bristles on the inner wall of the two arc-shaped brushes (7) are in contact with the outer wall of the first filter (3).

8. The medium-pressure feedwater pump for a combined cycle unit according to claim 6, characterized in that, The rack (19) is fitted with a protective cover.

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