Air discharge device for water pressure test of generator
Patent Information
- Application Number
- CN202521685664.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-08
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-08-08
AI Technical Summary
1）虚假压降：残留空气具有可压缩性，在保压阶段可能因空气缓慢溶解于水或温度变化导致压力下降，误判为系统泄漏
[0015]本申请提供的发电机水压试验用空气排放装置，通过将进水管和回水管分别连通在冷却管组沿其长度方向两端的最高点和低点处，在回水管位于发电机本体外的管身上连通供水管并在回水管位于发电机本体外的一端与回水管之间且靠近供水管的管身上设置第一阀门，在进水管位于发电机本体外的管身上设置排空管并在其位于发电机本体外的一端与排空管之间且靠近排空管设置第二阀门，并在排空管上设置排空阀。具体的，在水压试验时，关闭第一阀门和第二阀门的同时打开排气阀，通过供水管向回水管内通水且水进入到冷却管组内并逐渐充满冷却管组，待整个冷却管组内充满水后继续向回水管内供水，此时冷却管组内多余的水会经进水管和排空管排出，由于向冷却管组内通水的过程是将冷却管组内的空气逐渐挤出的过程，而待排空管内有水流出时，则说明冷却管组内的空气基本排干净，此时关闭排空阀，并停止向供水管内供水，以便于进行发电机水压试验，上述对冷却管组内的空气进行排放的方式便于操作，且通过通水将冷却管组内的空气挤出使得冷却管组内的空气排放更彻底。
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Figure CN224650809U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of generator technology, and in particular to an air discharge device for generator hydrostatic testing. Background Technology
[0002] The generator hydrostatic test is an important method for testing the sealing and strength of the generator stator cooling water system (usually hollow copper wire windings). It is mainly used for water-cooled generators. According to the generator maintenance manual, the generator must undergo a hydrostatic test of 0.75MPa (gauge pressure) for 8 hours during maintenance, and no leakage is required.
[0003] Currently, the cooling pipes used to cool the stator in generators lack stator water drain pipes, leading to a significant accumulation of air inside the cooling pipes during generator hydrostatic testing when water is added. If this air is not completely expelled during the generator hydrostatic test, it will negatively impact the test results in the following ways: 1) False pressure drop: Residual air is compressible. During the pressure holding stage, the pressure may drop due to the slow dissolution of air in water or temperature changes, which may be mistaken for a system leak.
[0004] 2) Pressure fluctuations: Air is significantly affected by temperature (ideal gas law). Even small changes in ambient temperature can cause pressure fluctuations, interfering with stability assessment.
[0005] Based on this, this application proposes an air discharge device for generator hydrostatic testing. Utility Model Content
[0006] This application provides an air venting device for generator hydrostatic testing, which solves the technical problems described in the background art above.
[0007] To solve the above-mentioned technical problems, this application adopts the following technical solution: This application provides an air venting device for generator hydrostatic testing, comprising: A cooling pipe assembly is arranged around the stator winding inside the generator body and is used to cool the stator winding. The highest and lowest points at both ends of the assembly along its length are respectively connected to an inlet pipe and a return pipe. The ends of the inlet pipe and the return pipe that are away from the cooling pipe assembly both penetrate through and extend out of the generator body. An air emission assembly includes a water supply pipe and an air vent pipe connected to the return water pipe and the inlet water pipe respectively on pipes located outside the generator body; the return water pipe is provided with a first valve on its pipe body at one end outside the generator body and near the water supply pipe, the inlet water pipe is provided with a second valve on its pipe body at one end outside the generator body and near the air vent pipe, and the air vent pipe is provided with an exhaust valve.
[0008] Optionally, the cooling pipe assembly includes two annular water pipes and multiple straight water pipe sections; One end of each of the straight water pipes is connected at equal intervals to one of the annular water pipes, and the other end of the pipe is connected to another of the annular water pipes. One end of the inlet pipe is connected to the highest point of one of the annular water pipes in the vertical direction, and one end of the return pipe is connected to the lowest point of another annular water pipe in the vertical direction.
[0009] Optionally, the water inlet pipe includes a first vertical pipe section, a horizontal pipe section, and a second vertical pipe section; One end of the first vertical pipe section is connected to the highest point of one of the annular water pipes in the vertical direction, and the other end of the pipe section is connected to one end of the horizontal pipe section that extends into the generator body. The other end of the horizontal pipe section is connected to one end of the second vertical pipe section.
[0010] Optionally, both of the annular water pipes and the plurality of the straight water pipe sections are made of copper.
[0011] Optionally, one end of the water supply pipe away from the return pipe is connected to a water source, and a water pump is installed in the water source. One end of the water supply pipe extends into the water source and is connected to the outlet of the water pump.
[0012] Optionally, a third valve may be installed on the water supply pipe.
[0013] Optionally, one end of the return water pipe located outside the generator body is connected to the water inlet of the cooler, and the water outlet of the cooler is connected to the end of the water inlet pipe located outside the generator body.
[0014] Optionally, the exhaust valve is a manual exhaust valve.
[0015] The air venting device for generator hydrostatic testing provided in this application connects the inlet pipe and the return pipe to the highest and lowest points at both ends of the cooling pipe assembly along its length, respectively. A supply pipe is connected to the return pipe outside the generator body, and a first valve is installed on the pipe body between the return pipe outside the generator body and the return pipe, close to the supply pipe. An venting pipe is installed on the inlet pipe outside the generator body, and a second valve is installed between the inlet pipe outside the generator body and the venting pipe, close to the venting pipe. An venting valve is installed on the venting pipe. Specifically, during the hydrostatic test, the first and second valves are closed while the vent valve is opened. Water is supplied through the water supply pipe to the return pipe and gradually fills the cooling pipe assembly. Once the entire cooling pipe assembly is full, water is supplied to the return pipe. Excess water in the cooling pipe assembly is discharged through the inlet pipe and the drain pipe. The process of supplying water to the cooling pipe assembly gradually squeezes out the air. When water flows out of the drain pipe, it indicates that the air in the cooling pipe assembly has been basically removed. At this point, the drain valve is closed and the water supply to the water supply pipe is stopped to facilitate the generator hydrostatic test. The above method of venting air from the cooling pipe assembly is easy to operate, and the air venting through water squeezes out the air in the cooling pipe assembly, making the air removal more thorough. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of an air venting device for a generator hydrostatic test provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of a cooling pipe assembly provided in one embodiment of this application; Figure 3 Provided for an embodiment of this application Figure 2 Front view of the intermediate cooling pipe assembly.
[0018] In the diagram: 100, Cooling pipe assembly; 101, Annular water pipe; 102, Straight water pipe section; 200, Generator body; 201, Stator winding; 300, Inlet pipe; 301, Second valve; 302, First vertical pipe section; 303, Horizontal pipe section; 304, Second vertical pipe section; 400, Return pipe; 401, First valve; 500, Air exhaust assembly; 501, Water supply pipe; 5011, Third valve; 502, Drain pipe; 5021, Exhaust valve; 600, Water source; 601, Water pump; 700, Cooler. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.
[0020] refer to Figures 1 to 3 This application provides an air venting device for generator hydrostatic testing, comprising: A cooling pipe assembly 100 is arranged inside the generator body 100 around the stator winding 201 and is used to cool the stator winding 201. The highest and lowest points at both ends of the cooling pipe assembly 100 are respectively connected to a water inlet pipe 300 and a water return pipe 400. The ends of the water inlet pipe 300 and the water return pipe 400 away from the cooling pipe assembly 100 both pass through and extend outside the generator body 200. The generator body 200 includes, but is not limited to, a water-cooled generator. Its structure can be found in the prior art, and this application does not specifically limit it.
[0021] Air exhaust assembly 500 includes a water supply pipe 501 and an air vent pipe 502 connected to the return water pipe 400 and the inlet water pipe 300 respectively located outside the generator body 200; the return water pipe 400 is provided with a first valve 401 at its end outside the generator body 200 and near the water supply pipe 501, the inlet water pipe 300 is provided with a second valve 301 at its end outside the generator body 200 and near the air vent pipe 502, and the air vent pipe 502 is provided with an exhaust valve 5021.
[0022] The air venting device for generator hydrostatic testing provided in this application connects the inlet pipe 300 and the return pipe 400 to the highest and lowest points at both ends of the cooling pipe assembly 100 along its length, respectively. A supply pipe 501 is connected to the return pipe 400 outside the generator body 200. A first valve 401 is installed on the return pipe 400 outside the generator body 200, between the return pipe 400 and the supply pipe 501. An venting pipe 502 is installed on the inlet pipe 300 outside the generator body 200, between the inlet pipe 300 and the venting pipe 502, between the inlet pipe 300 and the venting pipe 502, and a second valve 301 is installed on the venting pipe 502. A venting valve 5021 is installed on the venting pipe 502. Specifically, during the water pressure test, while closing the first valve 401 and the second valve 301, the vent valve 5021 is opened. Water is supplied through the water supply pipe 501 to the return water pipe 400, and the water enters the cooling pipe assembly 100, gradually filling it. After the entire cooling pipe assembly 100 is filled with water, water is supplied to the return water pipe 400. At this time, excess water in the cooling pipe assembly 100 will be discharged through the inlet pipe 300 and the drain pipe 502. Due to the excessive water supply to the cooling pipe assembly 100... The process involves gradually squeezing out the air from the cooling pipe assembly 100. When water flows out of the vent pipe 502, it indicates that the air in the cooling pipe assembly 100 has been basically purged. At this point, the vent valve 5021 is closed, and the water supply to the water supply pipe 501 is stopped to facilitate the generator water pressure test. The above method of purging air from the cooling pipe assembly 100 is easy to operate, and squeezing out the air from the cooling pipe assembly 100 by passing water makes the air purging from the cooling pipe assembly 100 more thorough.
[0023] In some embodiments, reference Figure 2 and Figure 3 The cooling pipe assembly 100 in this application includes two annular water pipes 101 and multiple straight water pipes 102. Specifically, one end of each straight water pipe 102 is connected at equal intervals to one of the annular water pipes 101, and the other end is connected to the other annular water pipe 101. One end of the inlet pipe 300 is connected to the highest point in the vertical direction of one of the annular water pipes 101, and one end of the return pipe 400 is connected to the lowest point in the vertical direction of the other annular water pipe 101. The purpose of the generator hydrostatic test is to detect the leakage of the generator stator cooling water system (i.e., the cooling pipe assembly 100 in this application). If there is no leakage during the test, it indicates that the cooling pipe assembly 100 has good airtightness. The two ends of multiple straight water pipes 102 are connected to annular water pipes 101, which increases the heat exchange area between the cooling pipe assembly 100 and the stator winding 201. This allows the cooling water entering the cooling pipe assembly 100 to quickly exchange heat with the stator winding 201 during the operation of the generator 200, thereby reducing the temperature of the stator winding 201 and improving the cooling efficiency of the stator winding 201.
[0024] In the above embodiment, since one end of the inlet pipe 300 is connected to the highest point of one of the annular water pipes 101 in the vertical direction, and one end of the return pipe 400 is connected to the lowest point of another annular water pipe 101 in the vertical direction, when the generator water pressure test is performed, the water from the supply pipe 501 passes through the return pipe 400 in sequence and gradually fills the other annular water pipe 101, multiple straight water pipes 102 and one of the annular water pipes 101 until it is discharged from the drain pipe 502. This squeezes out the air in the entire cooling pipe assembly 100, and then the exhaust valve 5021 is closed and the water supply is stopped to perform the water pressure test, thereby exhausting the air in the cooling pipe assembly 100 as completely as possible.
[0025] In some embodiments, reference Figure 2 and Figure 3 The water inlet pipe 300 in this application includes a first vertical pipe section 302, a horizontal pipe section 303, and a second vertical pipe section 304. Specifically, one end of the first vertical pipe section 302 is connected to the highest point in the vertical direction of one of the annular water pipes 101, and its other end is connected to one end of the horizontal pipe section 303 extending into the generator body 200. The other end of the horizontal pipe section 303 is connected to one end of the second vertical pipe section 304. The drain pipe 502 is located on the horizontal pipe section 303 outside the generator body 200.
[0026] In the above embodiment, the end of the water inlet pipe 300 that is connected to one of the annular pipes 101 needs to be connected to the highest point of the annular pipe 101 in the vertical direction. The first vertical pipe section 302 is set to facilitate its connection with the highest point of the annular water pipe 101 in the vertical direction. The horizontal pipe section 303 is convenient to pass through the generator body 200. The second vertical pipe section 304 is set to facilitate the circulation of cooling water during the process of setting up the stator winding 201 by the cooling pipe group 100.
[0027] In some embodiments, the two annular water pipes 101 and the plurality of straight water pipes 102 in this application are all made of copper. The purpose of the cooling pipe assembly 100, which consists of the two annular water pipes 101 and the plurality of straight water pipes 102, is to exchange heat with the stator winding 201 to achieve cooling. Copper has a good thermal conductivity, which allows the cooling water in the annular water pipes 101 and the straight water pipes 102 to quickly exchange heat with the stator winding 201, thereby improving the heat exchange efficiency of the stator winding 201.
[0028] In some embodiments, reference Figure 1In this application, the end of the water supply pipe 501 furthest from the return pipe 400 is connected to a water source 600. A water pump 601 is installed inside the water source 600. One end of the water supply pipe 501 extends into the water source 600 and is connected to the outlet of the water pump 601. The water source 600 can be a purified water storage tank or a purified water pool, and can be specifically set according to actual needs. This application does not impose any specific limitations on it.
[0029] In the above embodiment, the water pump 601 is turned on, and the water in the water source 600 enters the water supply pipe 501 under the power provided by the water pump 601, so as to achieve the purpose of injecting into the cooling pipe group 100.
[0030] In some embodiments, reference Figure 1 In this application, a third valve 5011 is provided on the water supply pipe 501. The third valve 5011 is located near the return water pipe 400.
[0031] In the above embodiment, the third valve 5011 is a flow regulating valve. The amount of water injected into the cooling pipe assembly 100 can be accurately measured through the third valve 5011, allowing staff to monitor the water injection status promptly. Furthermore, after the water injection process is completed, closing the third valve 5011 can promptly stop the water supply.
[0032] In some embodiments, reference Figure 1 In this application, the end of the return water pipe 400 located outside the generator body 200 is connected to the water inlet of the cooler 700, and the water outlet of the cooler 700 is connected to the end of the inlet pipe 300 located outside the generator body 200.
[0033] In the above embodiment, the cooler 700 is configured such that during the heat exchange process of the stator winding 201 through the cooling pipe assembly 100, the water after heat exchange enters the return water pipe 400 and the cooler 700 sequentially through the cooling pipe assembly 100. After being cooled by the cooler 700, it enters the cooling pipe assembly 100 through the inlet water pipe 300, so that the water in the cooling pipe assembly 100 is always cooling water, thereby ensuring the cooling effect of the cooling pipe assembly 100 on the stator winding 201.
[0034] In some embodiments, the exhaust valve 5021 in this application is a manual exhaust valve.
[0035] In the above embodiment, during the generator hydrostatic test, the exhaust valve 5021 needs to be opened first. After water flows out of the vent pipe 502 (which proves that the air in the cooling pipe group 100 has been squeezed out by water), the exhaust valve 5021 needs to be closed in time. During this process, the staff observes and operates the valve. The exhaust valve 5021 is a manual exhaust valve, which can reduce the cost of the air venting device for the generator hydrostatic test and make it easier for the staff to operate.
[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. An air venting device for a generator hydrostatic test, characterized in that, include: A cooling pipe assembly (100) is arranged inside the generator body (200) around the stator winding (201) and is used to cool the stator winding (201). The highest and lowest points at both ends of the cooling pipe assembly (100) along its length are respectively connected to a water inlet pipe (300) and a water return pipe (400). The ends of the water inlet pipe (300) and the water return pipe (400) away from the cooling pipe assembly (100) both penetrate through and extend outside the generator body (200). An air exhaust assembly (500) includes a water supply pipe (501) and an air vent pipe (502) respectively connected to the return water pipe (400) and the inlet water pipe (300) located outside the generator body (200); the return water pipe (400) has a first valve (401) installed on its end located outside the generator body (200) and near the water supply pipe (501); the inlet water pipe (300) has a second valve (301) installed on its end located outside the generator body (200) and near the air vent pipe (502); and the air vent pipe (502) has an exhaust valve (5021).
2. The air venting device for generator hydrostatic testing according to claim 1, characterized in that, The cooling pipe assembly (100) includes two annular water pipes (101) and multiple straight water pipe sections (102). One end of each of the multiple straight water pipes (102) is connected at equal intervals to one of the annular water pipes (101), and the other end of each pipe is connected to another of the annular water pipes (101). One end of the inlet pipe (300) is connected to the highest point of one of the annular water pipes (101) in the vertical direction, and one end of the return pipe (400) is connected to the lowest point of another of the annular water pipes (101) in the vertical direction.
3. The air venting device for generator hydrostatic testing according to claim 2, characterized in that, The water inlet pipe (300) includes a first vertical pipe section (302), a horizontal pipe section (303), and a second vertical pipe section (304); One end of the first vertical pipe section (302) is connected to the highest point of one of the annular water pipes (101) in the vertical direction, and the other end is connected to one end of the horizontal pipe section (303) that extends into the generator body (200), and the other end of the horizontal pipe section (303) is connected to one end of the second vertical pipe section (304).
4. The air venting device for generator hydrostatic testing according to claim 2, characterized in that, Both of the annular water pipes (101) and the multiple straight water pipe sections (102) are made of copper.
5. The air venting device for generator hydrostatic testing according to claim 1, characterized in that, The end of the water supply pipe (501) away from the return pipe (400) is connected to a water source (600). A water pump (601) is installed in the water source (600). One end of the water supply pipe (501) extends into the water source (600) and is connected to the outlet of the water pump (601).
6. The air venting device for generator hydrostatic testing according to claim 1, characterized in that, A third valve (5011) is installed on the water supply pipe (501).
7. The air venting device for generator hydrostatic testing according to any one of claims 1 to 6, characterized in that, The return water pipe (400) is connected to the inlet of the cooler (700) at one end outside the generator body (200), and the outlet of the cooler (700) is connected to the end of the inlet pipe (300) outside the generator body (200).
8. The air venting device for generator hydrostatic testing according to any one of claims 1 to 6, characterized in that, The exhaust valve (5021) is a manual exhaust valve.