A water pump characteristic testing device for a nuclear power plant fire extinguishing system

Abstract

The utility model discloses a nuclear power plant fire fighting system's water pump characteristic testing arrangement, water pump characteristic testing arrangement includes at least one group water pump characteristic testing subassembly, and water pump characteristic testing subassembly includes: unit contact isolation valve, one end is connected in the pipeline between water pump and first fire water distribution system, drain valve, one end is connected in the other end of unit contact isolation valve, and the other end of drain valve is connected drainage point, wherein, drain valve and unit contact isolation valve are located in the same space. The utility model embodiment is through the reselection drainage point, and the other end of drain valve is set up in the fire water production system, thereby need not pass through first fire water distribution system and second fire water distribution system, therefore, compared with prior art's drainage scheme, and drainage path is greatly shortened, and is not influenced by along the way equipment and pipeline cleanliness, air cavity and other factors, and the flow regulation stability and test accuracy can be greatly promoted.

Description

Technical Field

[0001] This utility model relates to the technical field of fire protection systems in nuclear power plants, and in particular to a pump characteristic testing device for fire protection systems in nuclear power plants. Background Technology

[0002] In nuclear power plant fire protection systems, hydraulic characteristic tests of the fire water production system are conducted to verify whether the hydraulic characteristics (including head, shaft power, pump efficiency, and net positive suction head) of the pumps in the system meet the requirements under normal operating conditions. In existing technology, one pump in the fire water production system needs to be started during the test to provide a continuous flow, while the other three pumps in the same system are shut down. At this time, the necessary equipment isolation is established on-site, and a suitable location within the plant's fire protection network is found for drainage. While draining, the flow rate is measured and adjusted until it reaches the rated value of approximately 342 m³ / h. At this point, parameters such as pump outlet pressure, drainage flow rate, motor power, and current of the fire water production system need to be recorded. After data recording is completed, drainage is stopped, the site is restored, and the test results are calculated.

[0003] However, the existing technology has the following shortcomings. First, the drainage point in the original test scheme is located at the fire hydrant outside the plant of the second fire water distribution system, and the flow rate needs to be adjusted from 0 to 342 m³ / h. After passing through the first and second fire water distribution systems from the pump outlet of the fire water production system, the water finally discharges at the fire hydrant outlet, resulting in a long drainage path. Therefore, due to factors such as the condition of equipment along the route, pipe cleanliness, and air pockets, the feedback from the flow adjustment stage to the measurement stage is very slow and unstable. This manifests as large and continuous fluctuations in the test measurement results, making it difficult to control the rated flow rate at 342 m³ / h. 3 Near / h, there is a high risk of overflow, which could easily lead to the accidental start of non-test pumps and force the test to be terminated. Utility Model Content

[0004] The purpose of this invention is to provide a pump characteristic testing device for a nuclear power plant fire protection system, which aims to solve the problems of slow and unstable flow regulation and measurement feedback, as well as the inconvenience of communication between the flow regulation and measurement locations in the existing technology.

[0005] This utility model provides a pump characteristic testing device for a nuclear power plant fire protection system. The nuclear power plant fire protection system includes a fire water production system, a first fire water distribution system, and a second fire water distribution system connected in sequence. The fire water production system includes a water tank and a pump connected at one end to the water tank. The other end of the pump is connected to the first fire water distribution system. The pump characteristic testing device includes at least one set of pump characteristic testing components, which include:

[0006] Unit communication isolation valve, one end of which is connected to the pipeline between the water pump and the first fire water distribution system;

[0007] A drain valve, one end of which is connected to the other end of the unit communication isolation valve, and the other end of which is connected to a drain point;

[0008] The drain valve and the unit communication isolation valve are located in the same space.

[0009] Optionally, the fire water production system includes multiple water pumps with one end connected to the water tank, and the other end of each water pump is connected to the first fire water distribution system. Multiple water pump characteristic testing components are correspondingly provided, and one end of the unit interconnection isolation valve in each water pump characteristic testing component is connected to the pipeline between the corresponding water pump and the first fire water distribution system.

[0010] Optionally, the fire water production system includes multiple water tanks, each of which is connected to at least one water pump. Multiple water pump characteristic testing components are correspondingly provided, and one end of the unit interconnection isolation valve in each water pump characteristic testing component is connected to the pipeline between the corresponding water pump and the first fire water distribution system.

[0011] Optionally, the unit interconnection isolation valves corresponding to different water tanks are connected via pipelines.

[0012] Optionally, the unit interconnection isolation valves corresponding to multiple pump characteristic test components are located in the same space, and the drain valves corresponding to multiple pump characteristic test components are located in the same space.

[0013] Optionally, a flow meter may also be included, which is installed between the unit interconnection isolation valve and the drain valve.

[0014] Optionally, the first fire water distribution system includes a pressure stabilizing tank, and the water pump characteristic testing device further includes a pressure stabilizing tank isolation valve, the two ends of which are connected to the pressure stabilizing tank and the fire water production system, respectively.

[0015] Optionally, the water pump characteristic testing device further includes a pressure sensor, which is installed at the outlet of the water pump to measure the outlet pressure of the water pump.

[0016] Optionally, the unit communication isolation valve is an electrically operated isolation valve.

[0017] Optionally, the drain valve is an electric drain valve.

[0018] This utility model discloses a pump characteristic testing device for a nuclear power plant fire protection system. The pump characteristic testing device includes at least one set of pump characteristic testing components, each including: a unit communication isolation valve, one end of which is connected to a pipeline between the pump and the first fire water distribution system; and a drain valve, one end of which is connected to the other end of the unit communication isolation valve, and the other end of which is connected to a drain point. The drain valve and the unit communication isolation valve are located in the same space. This utility model embodiment, by reselecting the drain point and placing it at the other end of the drain valve in the fire water production system, eliminates the need to pass through the first and second fire water distribution systems. Therefore, compared to existing drainage schemes, the drainage path is significantly shortened and is unaffected by factors such as the cleanliness of equipment and pipelines along the route, and air chambers, resulting in significantly improved flow regulation stability and testing accuracy. Simultaneously, placing the drain valve and the unit communication isolation valve in the same space facilitates centralized adjustment and measurement of flow by operators, reducing fluctuations in measurement results caused by communication difficulties. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural schematic diagram of a nuclear power plant fire protection system provided by this utility model;

[0021] Figure 2 A schematic diagram of the structure of the fire water production system and the water pump characteristic testing component provided by this utility model.

[0022] Explanation of the markings in the image:

[0023] 1. Nuclear power plant fire protection system; 10. Fire water production system; 100. Water tank; 101. Water pump; 11. First fire water distribution system; 110. Pressure stabilizing tank; 12. Second fire water distribution system;

[0024] 2. Pump characteristic testing device; 20. Pump characteristic testing components; 200. Unit connection isolation valve; 201. Drain valve; 202. Drainage point; 21. Flow meter; 22. Pressure stabilizing tank isolation valve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0027] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0029] Please see Figure 1 and Figure 2 This utility model provides a pump characteristic testing device for a nuclear power plant fire protection system. The nuclear power plant fire protection system 1 includes a fire water production system 10, a first fire water distribution system 11, and a second fire water distribution system 12 connected in sequence. The fire water production system 10 includes a water tank 100 and a pump 101 connected to the water tank 100 at one end and connected to the first fire water distribution system 11 at the other end. The pump characteristic testing device 2 includes at least one set of pump characteristic testing components 20. The pump characteristic testing components 20 include: a unit communication isolation valve 200, one end of which is connected to a pipeline between the pump 101 and the first fire water distribution system 11; and a drain valve 201, one end of which is connected to the other end of the unit communication isolation valve 200 and the other end of which is connected to a drain point 202. The drain valve 201 and the unit communication isolation valve 200 are located in the same space.

[0030] It should be explained that the pump characteristic test assembly 20, composed of a unit connection isolation valve 200 and a drain valve 201, is used to test the performance of the pump. It ensures the safety and accuracy of the test process by shortening the drainage path and improving the stability of flow regulation, thereby verifying the hydraulic characteristics of the pump 101 in the fire water production system 10. The unit connection isolation valve 200 is used to connect or isolate the pump 101 from the fire water distribution system 11.

[0031] This embodiment installs a unit communication isolation valve 200 on the pipeline between the water pump 101 and the first fire water distribution system 11, and connects a drain valve 201 to the other end of the isolation valve. The drain point 202 is located near the water pump 101, and the drain valve 201 and the unit communication isolation valve 200 are located in the same space. This not only makes it very convenient for operators to communicate face-to-face during the flow regulation process, but also significantly shortens the drainage path, reduces the impact of equipment and pipelines along the way on the drainage process, makes the flow regulation and measurement feedback faster and more stable, can control the rated flow more accurately, reduces the risk of overflow, avoids the problem of test termination due to the accidental start of non-test water pumps, and simplifies the test process, improving test efficiency and accuracy.

[0032] Furthermore, the fire water production system 10 includes multiple water pumps 101 with one end connected to the water tank 100, and the other end of each water pump 101 is connected to the first fire water distribution system 11. Multiple water pump characteristic testing components 20 are correspondingly provided, and one end of the unit interconnection isolation valve 200 in each water pump characteristic testing component 20 is connected to the pipeline between the corresponding water pump 101 and the first fire water distribution system 11.

[0033] In this embodiment, the fire water production system 10 includes multiple water pumps 101. One end of each water pump 101 is connected to a water tank 100, and the other end is connected to a first fire water distribution system 11. For each water pump 101, an independent water pump characteristic testing assembly 20 is provided. In each testing assembly, a unit communication isolation valve 200 is connected at one end to the pipeline between the corresponding water pump 101 and the first fire water distribution system 11, and at the other end to a drain valve 201. The other end of the drain valve 201 is connected to a drain point 202, and the drain valve 201 and the unit communication isolation valve 200 are located in the same space.

[0034] Furthermore, each pump 101 has an independent testing component, allowing for separate characteristic tests on each pump 101 without interference, thus improving testing flexibility and accuracy. The drainage point 202 is located close to the pump 101, and the drainage valve 201 and the unit connection isolation valve 200 are located in the same space, significantly shortening the drainage path and reducing the impact of along-the-way equipment and pipelines on the drainage process. Flow regulation and measurement feedback are faster and more stable, enabling more precise control of the rated flow, reducing the risk of overflow, and avoiding test interruptions caused by accidental starting of non-test pumps. This simplifies the testing process, improves testing efficiency, and, because each testing component is independent, different pumps 101 can be tested separately as needed, facilitating management and maintenance.

[0035] In one embodiment, the fire water production system 10 includes multiple water tanks 100, each of which is connected to at least one water pump 101. Multiple water pump characteristic testing components 20 are correspondingly provided, and one end of the unit communication isolation valve 200 in each water pump characteristic testing component 20 is connected to the pipeline between the corresponding water pump 101 and the first fire water distribution system 11.

[0036] In this embodiment, the fire water production system 10 includes multiple water tanks 100, each water tank 100 is connected to at least one water pump 101, and the other end of each water pump 101 is connected to the first fire water distribution system 11. When a water tank 100 malfunctions, requires maintenance, or has insufficient water supply, the other water tanks 100 can still supply water to the fire water distribution system through their connected water pumps 101, ensuring the continuous and stable operation of the fire water production system 10.

[0037] Each pump characteristic testing assembly 20 has a unit connection isolation valve 200 connected at one end to the pipeline between the corresponding pump 101 and the first fire water distribution system 11, and at the other end to a drain valve 201. The other end of the drain valve 201 is connected to a drain point 202, and the drain valve 201 and the unit connection isolation valve 200 are located in the same space. Through the configuration of multiple water tanks 100 and multiple pumps 101, multi-source water supply is achieved, enhancing the redundancy and reliability of the fire protection system. Each pump 101 is equipped with an independent pump characteristic testing assembly 20, allowing for separate characteristic tests on each pump 101 without interference, improving the flexibility and accuracy of the tests.

[0038] Furthermore, the unit interconnection isolation valves 200 corresponding to different water tanks 100 are connected by pipelines. In this embodiment, based on the fire water production system 10 having multiple water tanks 100, each water tank 100 being connected to at least one water pump 101 and correspondingly equipped with a water pump characteristic testing component 20, the unit interconnection isolation valves 200 corresponding to different water tanks 100 are physically connected by laying pipelines to construct an interconnected water flow control network.

[0039] In the original test plan, the unit interconnection isolation valves corresponding to different water tanks were in the closed state, which made the fire water production system and the first fire water distribution system relatively independent, each forming a closed pipe network circulation. When the water consumption in a certain system changes, such as a decrease in the water output of a water tank in the fire water production system due to a pump failure, or a sudden increase in the water consumption of a local area in the first fire water distribution system, the pipe network pressure in that fire system will drop rapidly due to the lack of water source interaction with other systems. Therefore, in this embodiment, the test state settings of the unit interconnection isolation valves were optimized.

[0040] In a specific embodiment, with Figure 1 Taking the two pump characteristic test components 20 as an example, during the test, the unit connection isolation valve 200 in each pump characteristic test component 20 is placed in the "open" state so that the fire water production system 10 and the first fire water distribution system 11 can serve as backups for each other and balance the pipeline pressure of the fire water production system 10 and the first fire water distribution system 11. Due to this change in state setting, there is no need to record the system unavailability time during the test, which is more conducive to fire alarm abnormal response.

[0041] In one embodiment, the unit communication isolation valves 200 corresponding to multiple pump characteristic testing components 20 are located in the same space, and the drain valves 201 corresponding to multiple pump characteristic testing components 20 are also located in the same space. In this embodiment, since the unit communication isolation valves 200 and drain valves 201 corresponding to multiple pump characteristic testing components 20 are located in the same space, operators do not need to frequently travel between different areas. For example, when adjusting the status of the unit communication isolation valve 200 or opening / closing the drain valve 201, all related operations can be completed within this centralized space, greatly shortening operation time and improving work efficiency.

[0042] Furthermore, a flow meter 21 is also included, which is installed between the unit connection isolation valve 200 and the drain valve 201. In this embodiment, the flow meter 21 is installed between the unit connection isolation valve 200 and the drain valve 201, and can measure the water flow through this section of the pipeline in real time. During the operation of the fire protection system, whether it is normal water supply, test operation, or fire alarm response, understanding the real-time water flow data is crucial. For example, when the fire water production system 10 supplies water to the fire water distribution system, the flow meter 21 can accurately display the water supply volume, helping operators to determine whether the system is operating normally according to design requirements. Through continuous monitoring and analysis of the data from the flow meter 21, the trend of water flow changes can be understood. If a sudden increase or decrease in flow is found, it may mean that there is a fault or abnormality in the fire protection system, such as pipeline leakage, pump 101 failure, or abnormal valve opening, providing a basis for timely troubleshooting.

[0043] Furthermore, the first fire water distribution system 11 includes a pressure stabilizing tank 110, and the pump characteristic testing device 2 further includes an isolation valve for the pressure stabilizing tank 110. The two ends of the isolation valve are connected to the pressure stabilizing tank 110 and the fire water production system 10, respectively. In this embodiment, the isolation valve for the pressure stabilizing tank 110 is connected to the fire water production system 10 through the pressure stabilizing tank 110, and has the function of stabilizing the pressure of the first fire water distribution system 11. When conducting the pump hydraulic characteristic test of the fire water production system 10, it is necessary to close the isolation valve for the pressure stabilizing tank 110 to isolate the pressure of the pump 101 in the first fire water distribution system 11; otherwise, it will interfere with the pump outlet pressure measurement, thereby affecting the calculation of hydraulic parameters.

[0044] Furthermore, the pump characteristic testing device 2 also includes a pressure sensor installed at the outlet of the pump 101 to measure the outlet pressure of the pump 101. In this embodiment, the outlet pressure of the pump 101 is one of the important parameters for evaluating the performance of the pump 101. The pressure sensor, installed at the outlet of the pump 101, can directly and accurately measure the outlet pressure of the pump 101 under different operating conditions. During the long-term operation of the fire protection system, the performance of the pump 101 may change due to wear, corrosion, scaling, etc. The pressure sensor continuously monitors the outlet pressure of the pump 101, enabling timely detection of abnormal pressure fluctuations and providing a basis for the maintenance and repair of the pump 101. For example, if the outlet pressure continues to drop, it may indicate impeller wear or pipe blockage, requiring timely repair.

[0045] In a specific embodiment, the unit connection isolation valve 200 is an electrically operated isolation valve. The electrically operated isolation valve mainly consists of two parts: an electric actuator and a valve body. The valve body includes a valve disc, valve seat, valve stem, and valve cover, used to control the flow of water; the electric actuator is its core power and control component, providing power for opening and closing the valve and enabling remote control.

[0046] Specifically, the electric actuator is an electric motor, typically a three-phase asynchronous motor or a DC motor. The motor starts running when the control system issues an open or close command. For example, in a fire-fighting water system, when switching the water supply to different water tanks 100, the control system sends an open signal, and the motor starts. The motor's output speed is usually high, while opening and closing the valve requires large torque and low speed; therefore, a reduction mechanism is needed to reduce the speed and increase the torque. Taking a worm gear reducer as an example, the motor drives the worm to rotate, and the worm then drives the worm wheel to rotate. The worm wheel is connected to the valve stem, thus transmitting power to the valve stem. Under the action of the reduction mechanism, the valve stem performs linear or rotary motion, driving the valve disc to open or close. For a straight-through electric isolation valve, the valve stem typically performs linear motion, pushing the valve disc away from or pressing against the valve seat; for an angle electric isolation valve, the valve stem may perform rotary motion, driving the valve disc to rotate to achieve on / off switching.

[0047] In a specific embodiment, the drain valve 201 is an electric drain valve. Similar to an electric isolating valve, the electric motor transmits power to the valve stem via a reduction gear mechanism. For small-diameter electric drain valves 201, a micro-motor and a simple reduction gear set can be used; for large-diameter electric drain valves 201, a more powerful electric motor and a more complex reduction gear mechanism are required to ensure sufficient torque to drive the valve disc. The movement of the valve disc depends on the type of valve body. For example, in a shut-off type electric drain valve 201, the valve stem drives the valve disc in a linear motion to open and close the valve; in a ball valve type electric drain valve 201, the valve stem drives the ball to rotate 90°, thereby controlling the flow of fluid.

[0048] Furthermore, the electric actuator of the electric drain valve receives signals from the control system and controls the opening and closing of the valve accordingly. In the fire-fighting water system, when the water level in the water tank 100 or the pipeline reaches a certain height, the water level sensor transmits a signal to the control system, which then sends an opening signal to the electric drain valve to discharge excess water.

[0049] In the existing scheme, during the pump characteristic test, the initial state setting principle for the four pumps of the fire water production system is as follows: the test pump is in the start state, the two pumps with high start pressure are in the "manual stop" state, and the remaining pump with low start pressure is in the "automatic stop" state. The purpose of setting the pump with high start pressure to "manual stop" is to prevent the non-test pump from starting due to abnormal pressure drop in the fire pipeline network during drainage. However, the "manual stop" mode requires recording the downtime of the fire system, which affects the response to abnormal fire alarms. Therefore, in one embodiment, the test state setting of the standby pump 101 (i.e., the pump 101 not being tested) is optimized by setting all non-test pumps 101 to "automatic stop," eliminating the need to record downtime and ensuring the overall functional reliability of the fire system. In the "automatic stop" mode, when the pressure sensor detects that the pipeline pressure is below a certain threshold, the pump 101 with high start pressure can start automatically without intervention to maintain the pressure of each pipeline in the fire system. In contrast, in the "manual stop" mode, if the standby pump needs to be started, the main operator needs to manually start the pump, resulting in a slower response time.

[0050] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

[0051] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusivity.

[0052] The term "comprises" implies that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A pump characteristic testing device for a nuclear power plant fire protection system, the nuclear power plant fire protection system comprising a fire water production system, a first fire water distribution system, and a second fire water distribution system connected in sequence, the fire water production system comprising a water tank and a pump connected at one end to the water tank, the other end of the pump being connected to the first fire water distribution system, characterized in that, The pump characteristic testing device includes at least one set of pump characteristic testing components, the pump characteristic testing components include: Unit communication isolation valve, one end of which is connected to the pipeline between the water pump and the first fire water distribution system; A drain valve, one end of which is connected to the other end of the unit communication isolation valve, and the other end of which is connected to a drain point; The drain valve and the unit communication isolation valve are located in the same space.

2. The pump characteristic testing device for a nuclear power plant fire protection system according to claim 1, characterized in that, The fire water production system includes multiple water pumps with one end connected to the water tank, and the other end of each water pump is connected to the first fire water distribution system. Multiple water pump characteristic testing components are provided accordingly, and one end of the unit interconnection isolation valve in each water pump characteristic testing component is connected to the pipeline between the corresponding water pump and the first fire water distribution system.

3. The pump characteristic testing device for a nuclear power plant fire protection system according to claim 1, characterized in that, The fire water production system includes multiple water tanks, each of which is connected to at least one water pump. Multiple water pump characteristic testing components are provided accordingly. One end of the unit interconnection isolation valve in each water pump characteristic testing component is connected to the pipeline between the corresponding water pump and the first fire water distribution system.

4. The pump characteristic testing device for a nuclear power plant fire protection system according to claim 3, characterized in that, The unit interconnection isolation valves corresponding to different water tanks are connected by pipelines.

5. The pump characteristic testing device for a nuclear power plant fire protection system according to claim 2 or 3, characterized in that, The unit interconnection isolation valves corresponding to multiple pump characteristic test components are located in the same space, and the drain valves corresponding to multiple pump characteristic test components are located in the same space.

6. The pump characteristic testing device for a nuclear power plant fire protection system according to claim 1, characterized in that, It also includes a flow meter, which is installed between the unit interconnection isolation valve and the drain valve.

7. The pump characteristic testing device for a nuclear power plant fire protection system according to claim 1, characterized in that, The first fire water distribution system includes a pressure stabilizing tank, and the water pump characteristic testing device further includes a pressure stabilizing tank isolation valve. The two ends of the pressure stabilizing tank isolation valve are respectively connected to the pressure stabilizing tank and the fire water production system.

8. The pump characteristic testing device for a nuclear power plant fire protection system according to claim 1, characterized in that, The water pump characteristic testing device also includes a pressure sensor, which is installed at the outlet of the water pump to measure the outlet pressure of the water pump.

9. The pump characteristic testing device for a nuclear power plant fire protection system according to claim 1, characterized in that, The unit communication isolation valve is an electrically operated isolation valve.

10. The pump characteristic testing device for a nuclear power plant fire protection system according to claim 1, characterized in that, The drain valve is an electric drain valve.

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