Anti-overflow automatic negative pressure drainage control device for condensate pump pit of steam turbine

Abstract

The invention relates to a steam turbine condensate pump pit anti-overflow automatic negative pressure drainage control device which comprises an automatic trigger circuit and a jet flow negative pressure drainage device, the automatic trigger circuit comprises a floating ball, a connecting rod, a relay switch, a control loop and a jet flow electric control valve, and the jet flow negative pressure drainage device comprises a jet flow negative pressure generator. A negative pressure drainage pipe, a pressure guiding cavity, a water collecting tank and a drainage pipe; the connecting rod is installed on the right outer wall of the pump pit, the floating ball is installed at the lower end of the connecting rod and arranged at the bottom of the pump pit, and the upper end of the connecting rod is in trigger installation connection with the relay switch loop. An input port of the jet flow electric control valve is connected with a pump water outlet pipe through a pipeline, an output port of the jet flow electric control valve is connected with a jet flow input cavity of the jet flow negative pressure generator through a pipeline, and the jet flow negative pressure generator is installed in the pressure guiding cavity in a penetrating mode. And the labor efficiency is improved.

Description

Technical Field

[0001] The invention relates to a control device, in particular to an automatic negative pressure drainage control device for preventing overflow of a condensate pump pit of a steam turbine, and belongs to the technical field of electrical instrument control. Background Art

[0002] At present, most turbine generator condensate pumps are designed with a sunken pit arrangement on the side of the unit's condenser, which is used to discharge the condensate after the unit works to maintain vacuum and maintain safe and economical operation of the unit. Due to the sunken arrangement of the water pump, long-term operation may cause leakage of the water pipe joints including the pump body, resulting in overflow of the pump pit. Especially during the plum rain and rainstorm seasons, poor drainage can easily lead to the water filling of the pump pit, causing short circuit and burning of the pump motor electrical components and control circuits, posing a great hidden danger to the normal operation of the unit while causing great economic losses. Therefore, it is very necessary to invent an anti-overflow control device for industrial occasions with sunken pit arrangements of water pumps, which can automatically detect the water level and automatically drain the water to fully ensure the stable operation of the water pump. Summary of the Invention

[0003] The present invention is aimed at the problems existing in the prior art and provides an automatic negative pressure drainage control device for preventing overflow in the turbine condensate pump pit. This technical solution designs an automatically triggered jet negative pressure generating device to attract and discharge overflow water to the pump inlet in a closed loop, automatically circulating the water for drainage without the need for other power sources, saving energy and protecting the environment, and improving labor efficiency.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: an automatic negative pressure drainage control device for preventing overflow of a condensate pump pit of a steam turbine, characterized in that the control device includes an automatic trigger circuit and a jet negative pressure drainage device, wherein the automatic trigger circuit includes a float, a connecting rod, a relay switch, a control circuit and a jet electric control valve, and the jet negative pressure drainage device includes a jet negative pressure generator, a negative pressure drainage pipe, a pressure-inducing cavity, a water collecting trough and a drainage pipe; wherein the connecting rod is installed on the right outer wall of the pump pit, a float is installed at the lower end of the connecting rod and is arranged at the bottom of the pump pit, the upper end of the connecting rod is connected to the relay switch loop trigger installation, and the relay switch is connected to the jet electric control valve through the control circuit according to the principle of the electrical switch control circuit. The input port of the jet electric control valve is connected to the pump outlet pipe through a pipeline, and the output port of the jet electric control valve is connected to the jet input chamber of the jet negative pressure generator through a pipeline. The jet negative pressure generator is installed through the inside of the pressure-inducing cavity, and the jet output chamber of the jet negative pressure generator is connected to the water collection tank through a pipeline. A negative pressure drainage pipe is sealed and installed at one end of the left side of the pressure-inducing cavity, and the inlet of the negative pressure drainage pipe is installed through the bottom of the pump pit to absorb overflow water. A water collection tank is installed at the bottom of the pressure-inducing cavity, and a drainage pipe is installed on one side of the bottom of the water collection tank. Among them, the jet negative pressure generator includes a jet input chamber, a negative pressure outlet chamber, a nozzle, a discharge pipe, a jet output chamber, a suction chamber and a negative pressure inlet chamber. The high-pressure medium at the outlet of the jet drive source water pump directly enters the jet input chamber through the jet electric control valve. The fluid ejected by the nozzle is ejected at high speed under the throttling action of the nozzle to form a jet, and a suction flow is generated in the suction chamber. Under the action of suction, the air around the nozzle outlet is continuously sucked away, so that the pressure in the adsorption chamber drops to atmospheric pressure, forming a certain vacuum degree. The negative pressure generated by this vacuum degree in the jet negative pressure inlet chamber is used to attract overflow water at the bottom of the pump pit to be discharged into the pressure-inducing chamber through the negative pressure outlet chamber and then into the water collection tank for drainage and recovery to the water pump inlet pipe. The fluid after high-speed injection inside the jet device is discharged into the water collection tank through the discharge pipe and then through the jet output chamber for recycling and reuse. Among them, the control device also includes a water pump, which is arranged at the bottom of the pump pit, and the pump inlet pipe is installed at the inlet end of the water pump through the pump pit, wherein the pump inlet pipe is equipped with an inlet pressure measuring point; the pump outlet pipe is installed and connected to the outlet end of the water pump and then led out to the outside of the pump pit, wherein the pump outlet pipe is equipped with a water outlet pressure measuring point.The entire control process of the control device is as follows: when the pump pit overflow reaches a certain height, the float automatically senses the overflow water level height, reaches the set value, and immediately triggers the relay switch action through the connecting rod, the control circuit is closed and the power is turned on, the jet electric control valve is energized and opened, and the high-pressure medium condensate water with a certain pressure and flow output from the water pump outlet is introduced into the inlet of the jet negative pressure generator. The high-pressure medium enters the jet generator and forms a jet under the action of the nozzle, and flows in the suction chamber. Under the action of suction, a certain negative pressure vacuum is produced. Using the negative pressure suction principle, the overflow water in the water pump pit is sucked and discharged into the pressure-inducing cavity through the negative pressure drainage pipe. The overflow water attracted by the negative pressure enters the bottom of the sump again, and then is sent to the water pump inlet pipe through the drainage pipe. Since the water pump inlet pipe also forms a negative pressure working principle, the discharged overflow water is filtered out of impurities through the filter mesh and directly enters the water pump inlet pipe to continue the circulation output operation.

[0005] Compared to existing technologies, the present invention offers the following advantages: 1) It pioneers a jet negative pressure generator for use in the field of automatic pump pit drainage control, offering energy conservation, environmental protection, and a clever design. 2) A float automatically senses the overflow height and triggers a relay switch to control the jet negative pressure generator to drain the overflow. 3) The closed-loop system utilizes the high-pressure medium at the pump outlet as the driving source for the jet negative pressure generator, while simultaneously absorbing the water through the pump inlet negative pressure recycling process, eliminating the need for a separate power source. This results in energy conservation, environmental protection, and a clever design. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is the on-site layout diagram of the condensate pump pit anti-overflow automatic control device;

[0007] Figure 2 Schematic diagram of the jet negative pressure generator structure.

[0008] In the figure: 1. Pump pit, 2. Water pump, 3. Pump outlet pipe, 4. Water outlet pressure measuring point, 5. Relay switch, 6. Control circuit, 7. Jet electric control valve, 8. Jet negative pressure generator, 9. Pressure induction cavity, 10. Water collecting tank, 11. Filter, 12. Drainage pipe, 13. Negative pressure drainage pipe, 14. Connecting rod, 15. Float, 16. Pump inlet pipe, 17. Water inlet pressure measuring point, 18. Jet input cavity, 19. Negative pressure outlet cavity, 20. Nozzle, 21. Discharge pipe, 22. Jet output cavity, 23. Suction cavity, 24. Negative pressure inlet cavity. DETAILED DESCRIPTION

[0009] In order to deepen the understanding of the present invention, this embodiment is described in detail below with reference to the accompanying drawings.

[0010] Example 1: See Figure 1 、 Figure 2, an automatic negative pressure drainage control device for preventing overflow of a turbine condensate pump pit, the control device comprising an automatic triggering circuit and a jet negative pressure drainage device, wherein the automatic triggering circuit comprises a float 15, a connecting rod 14, a relay switch 5, a control circuit 6 and a jet electric control valve 7, the jet negative pressure drainage device comprises a jet negative pressure generator 8, a negative pressure drainage pipe 13, a pressure inducing cavity 9, a water collecting tank 10 and a drainage pipe 12; wherein the connecting rod 14 is mounted on the right outer wall of the pump pit 1, a float 15 is installed at the lower end of the connecting rod 14 and is arranged at the bottom of the pump pit 1, the upper end of the connecting rod 14 is connected to the relay switch 5 by a loop trigger installation, and the relay switch 5 is connected to the jet electric control valve 7 through the control circuit 6 according to the principle of the electrical switch control circuit. The input port of the jet electric control valve 7 is connected to the pump outlet pipe 3 through a pipeline. The output port of the jet electric control valve 7 is connected to the jet input chamber of the jet negative pressure generator 8 through a pipeline. The jet negative pressure generator 8 is installed inside the pressure-inducing cavity 9. The jet output chamber of the jet negative pressure generator 8 is connected to the water collection tank 10 through a pipeline. A negative pressure drainage pipe 13 is sealed and installed at one end on the left side of the pressure-inducing cavity 9. The inlet of the negative pressure drainage pipe 13 is installed at the bottom of the pump pit 1 to absorb overflow water. A water collection tank 10 is installed at the bottom of the pressure-inducing cavity 9. A drainage pipe 12 is installed on one side of the bottom of the water collection tank 10. A filter 11 is installed in the drainage pipe 12. The drainage pipe 12 is connected to the pump inlet pipe 16. Figure 2, wherein the jet negative pressure generator includes a jet input chamber 18, a negative pressure outlet chamber 19, a nozzle 20, a discharge pipe 21, a jet output chamber 22, a suction chamber 23 and a negative pressure inlet chamber 24. The high-pressure medium at the outlet of the jet driving source water pump directly enters the jet input chamber 18 through the jet electric control valve. The fluid ejected by the nozzle is ejected at high speed under the throttling action of the nozzle 20 to form a jet, and a suction flow is generated in the suction chamber 23. Under the action of suction, the air around the nozzle outlet is continuously sucked away, so that the pressure in the adsorption chamber drops to atmospheric pressure, forming a certain vacuum degree. The negative pressure generated by this vacuum degree in the jet negative pressure inlet chamber 24 is used to attract overflow water from the bottom of the pump pit to be discharged into the pressure-inducing chamber through the negative pressure outlet chamber 19 and then into the water collection tank for drainage and recovery to the water pump inlet pipe. The fluid after high-speed injection inside the jet device is discharged into the water collection tank through the discharge pipe 21 and then through the jet output chamber 22 for recycling and reuse. Among them, the control device also includes a water pump, the water pump 2 is arranged at the bottom of the pump pit 1, and the pump inlet pipe 16 is installed at the inlet end of the water pump 2 through the pump pit 1, wherein the pump inlet pipe 16 is equipped with a water inlet pressure measuring point 17; the pump outlet pipe 3 is installed and connected to the outlet end of the water pump 2 and then led out to the outside of the pump pit 1, wherein the pump outlet pipe 3 is equipped with a water outlet pressure measuring point 4. The entire control process of the control device is as follows: when the pump pit overflow reaches a certain height, the float automatically senses the overflow water level height, reaches the set value, and immediately triggers the relay switch action through the connecting rod, the control circuit is closed and the power is turned on, the jet electric control valve is energized and opened, and the high-pressure medium condensate water with a certain pressure and flow output from the water pump outlet is introduced into the inlet of the jet negative pressure generator. The high-pressure medium enters the jet generator and forms a jet under the action of the nozzle, and flows in the suction chamber. Under the action of suction, a certain negative pressure vacuum is produced. Using the negative pressure suction principle, the overflow water in the water pump pit is sucked and discharged into the pressure-inducing cavity through the negative pressure drainage pipe. The overflow water attracted by the negative pressure enters the bottom of the sump again, and then is sent to the water pump inlet pipe through the drainage pipe. Since the water pump inlet pipe also forms a negative pressure working principle, the discharged overflow water is filtered out of impurities through the filter mesh and directly enters the water pump inlet pipe to continue the circulation output operation.

[0011] In the above scheme, when the steam turbine is operating normally, the condensate in the condenser hot well enters the inlet of the condensate pump through the inlet pipe, the water pump starts to work, and outputs condensate of a certain pressure and flow rate through the outlet pipe. The inlet pressure P1 is negative pressure because it is at the inlet of the pump, and the outlet pressure P2 is positive pressure because it is at the outlet of the pump. When the water pump and pipe joints leak, or the industrial sewer network is suddenly blocked during the rainy season, causing the condensate pump pit to accumulate more water, threatening the safe operation of the motor and electrical circuit, the anti-overflow negative pressure drainage automatic control device starts to work: the float automatically senses the overflow water level height, and when it reaches the set value, it immediately triggers the relay switch through the connecting rod, the control loop is closed and the power is turned on, the jet electric control valve is energized and opened, and the condensate of a certain pressure and flow rate output from the water pump outlet is introduced into the inlet of the jet negative pressure generator, and the high-pressure medium enters A jet is formed inside the jet generator under the action of the nozzle, and flows by entrainment in the entrainment chamber. Under the action of entrainment, a certain negative pressure vacuum is produced. The overflow water in the water pump pit is sucked and discharged into the pressure-inducing cavity through the negative pressure drainage pipe by using the negative pressure suction principle. The overflow water attracted by the negative pressure enters the bottom of the sump again, and is then sent to the water pump inlet pipe through the drainage pipe. Since the water pump inlet pipe also forms a negative pressure working principle, the discharged overflow water directly enters the water pump inlet pipe after filtering impurities through the filter net to continue circulating output operation.

[0012] This solution pioneers a jet-type negative pressure generator for use in pump pit automatic drainage control, offering energy-saving, environmentally friendly, and ingenious applications. By utilizing the principle of negative pressure at the pump inlet and high pressure at the pump outlet, the high-pressure medium at the pump outlet is used in a closed loop as the generator's driving source. This medium is also recycled through the pump inlet's negative pressure, eliminating the need for a separate power source. This is a highly ingenious solution. By leveraging the negative pressure suction principle of the jet generator, the system leverages local industrial resources and utilizes locally available materials. High-pressure medium at the pump outlet serves as the generator's driving source. The high-pressure medium enters through the jet input chamber and is discharged from the jet output chamber to the sump. The high-pressure medium is ejected through the nozzle, creating a negative pressure that draws the overflow water out. This solution eliminates the need for a separate power source, offering energy-saving, environmentally friendly, and ingenious applications. A float senses the overflow level, which in turn triggers a relay switch via a connecting rod. This directly opens the jet-type electric control valve, allowing the jet medium to operate. This system automatically senses and triggers the device, eliminating the need for human intervention. This solution makes full use of industrial occasions, uses local materials in a closed cycle to utilize the high-pressure medium at the pump outlet as the driving source of the jet negative pressure generator, and at the same time absorbs the drainage through the negative pressure at the pump inlet for recycling, without the need for other power sources; it pioneered a jet negative pressure generating device for use in the control field of automatic drainage of pump pits, and further senses the overflow height through a float, automatically triggers the jet electric control valve to open, and introduces the jet medium for negative pressure suction drainage. This technology is cleverly designed, energy-saving and environmentally friendly, and fully ensures that the overflow from the pump pit is discharged in time, ensuring the safe operation of the equipment, and can be extended to other similar pump pit industrial occasions. It should be noted that the above embodiments are not used to limit the scope of protection of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions fall within the scope of protection of the claims of the present invention.

Claims

1. An automatic negative pressure drainage control device for preventing overflow of a steam turbine condensate pump pit, characterized in that: The control device includes an automatic trigger circuit and a jet negative pressure drainage device, wherein the automatic trigger circuit includes a float, a connecting rod, a relay switch, a control circuit and a jet electric control valve, and the jet negative pressure drainage device includes a jet negative pressure generator, a negative pressure drainage pipe, a pressure induction cavity, a water collection tank and a drainage pipe; wherein the connecting rod is installed on the right outer wall of the pump pit, a float is installed at the lower end of the connecting rod and arranged at the bottom of the pump pit, the upper end of the connecting rod is connected to the relay switch loop trigger installation, the relay switch is connected to the jet electric control valve through the control circuit, and the jet The input port of the fluid electric control valve is connected to the pump outlet pipe through a pipeline, the output port of the jet electric control valve is connected to the jet input chamber of the jet negative pressure generator through a pipeline, the jet negative pressure generator is installed through the pressure-inducing cavity, the jet output chamber of the jet negative pressure generator is connected to the water collecting tank through a pipeline, a negative pressure drain pipe is sealed and installed at one end of the left side of the pressure-inducing cavity, wherein the inlet of the negative pressure drain pipe is installed through the bottom of the pump pit to absorb overflow water, a water collecting tank is installed at the bottom of the pressure-inducing cavity, and a drainage pipe is installed on one side of the bottom of the water collecting tank.

2. The automatic negative pressure drainage control device for preventing overflow of condensate pump pit of steam turbine according to claim 1 is characterized in that: A filter screen is installed in the drainage pipe, and the drainage pipe is connected to the pump water inlet pipe.

3. The automatic negative pressure drainage control device for preventing overflow of condensate pump pit of steam turbine according to claim 2 is characterized in that: The jet negative pressure generator comprises a jet input chamber, a negative pressure outlet chamber, a nozzle, a discharge pipe, a jet output chamber, a suction chamber and a negative pressure inlet chamber. The high-pressure medium at the outlet of the jet driving source water pump directly enters the jet input chamber through the jet electric control valve. The fluid ejected by the nozzle is ejected at high speed under the throttling action of the nozzle to form a jet, and a suction flow is generated in the suction chamber. Under the action of suction, the air around the nozzle outlet is continuously sucked away, so that the pressure in the adsorption chamber drops to atmospheric pressure, forming a certain vacuum degree. The negative pressure generated by this vacuum degree in the jet negative pressure inlet chamber is used to attract overflow water at the bottom of the pump pit to be discharged into the pressure-inducing chamber through the negative pressure outlet chamber and then into the water collecting tank for drainage and recovery to the water pump inlet pipe. The fluid after high-speed injection in the jet device is discharged into the water collecting tank through the discharge pipe and then through the jet output chamber for recycling and reuse.

4. The automatic negative pressure drainage control device for preventing overflow of condensate pump pit of steam turbine according to claim 3 is characterized in that: The control device also includes a water pump, which is arranged at the bottom of the pump pit. The pump inlet pipe is installed at the inlet end of the water pump through the pump pit, wherein the pump inlet pipe is equipped with a water inlet pressure measuring point; the pump outlet pipe is installed and connected to the outlet end of the water pump and then led out to the outside of the pump pit, wherein the pump outlet pipe is equipped with a water outlet pressure measuring point.

5. The automatic negative pressure drainage control device for preventing overflow of a steam turbine condensate pump pit according to claim 3 or 4, characterized in that: The control process is as follows: when the overflow of the pump pit reaches a certain height, the float automatically senses the overflow water level height, reaches the set value, and immediately triggers the relay switch action through the connecting rod, the control loop is closed and the power is turned on, the jet electric control valve is energized and opened, and the high-pressure medium condensate water with a certain pressure and flow output from the pump outlet is introduced into the inlet of the jet negative pressure generator. The high-pressure medium enters the jet generator and forms a jet under the action of the nozzle, and flows in the suction chamber. Under the action of suction, a certain negative pressure vacuum is produced. Using the principle of negative pressure suction, the overflow water in the pump pit is sucked and discharged into the pressure-inducing cavity through the negative pressure drainage pipe. The overflow water attracted by negative pressure enters the bottom of the sump again, and then is sent to the water inlet pipe of the water pump through the drainage pipe. Since the water inlet pipe of the water pump also forms a negative pressure working principle, the discharged overflow water directly enters the water inlet pipe of the water pump after filtering impurities through the filter net and continues to circulate and output.

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