Airtight test tool for generator stator coil

Abstract

The utility model discloses an airtight test tool for a generator stator coil. The airtight test tool comprises a sealing element, a pressure detection device, a first valve and a locking assembly, the sealing element is detachably mounted on the water outlet of the stator coil, and a ventilation channel communicated with the water outlet is arranged in the sealing element; an inflation inlet is detachably formed in the sealing piece and is communicated with an inflation device; the pressure detection device is detachably mounted on the sealing element and is communicated with the air duct; the first valve is installed on the sealing piece and controls connection or disconnection of the inflation inlet and the ventilation channel. The locking assembly is detachably installed on the first valve and limits rotation of a handle of the first valve, and the first valve is locked at the communicating or blocking position. Therefore, installation by testers is facilitated, the maintenance position of the stator coil is convenient to confirm, the efficiency of an airtight test and the accuracy of a test result during maintenance are improved, and the labor intensity is reduced.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant maintenance technology, and in particular to a generator stator coil airtightness test tool. Background Technology

[0002] The generator stator coil is water-cooled. During major overhauls, it is necessary to periodically conduct airtightness tests on the stator coil to check the water circuit sealing of the stator winding. Additionally, after draining the cooling water from the stator coil during overhauls, the coil bars need maintenance. Airtightness is generally checked by adding air to the stator coil's drain outlet.

[0003] However, since the air filling pipe is not easy to connect with the drain outlet of the stator coil, gaps are easily generated, which leads to inaccurate maintenance test results, is time-consuming and labor-intensive, and seriously affects the efficiency of the airtightness test. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a generator stator coil airtightness test tool.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A generator stator coil airtightness testing tool is constructed, comprising: a sealing element, a pressure detection device, a first valve, and a locking assembly; the sealing element is detachably installed on the drain port of the stator coil, and a venting channel communicating with the drain port is provided inside the sealing element; an inflation port is detachably installed on the sealing element, and the inflation port is connected to an inflation device; the pressure detection device is detachably installed on the sealing element and is connected to the venting channel; the first valve is installed on the sealing element to control the connection or blockage between the inflation port and the venting channel; the locking assembly is detachably installed on the first valve to restrict the rotation of the first valve handle and lock the first valve in the connection or blockage position.

[0006] Furthermore, the locking component is a rope, one end of which is wrapped and fixed to the handle of the first valve, and the other end of which is wrapped and fixed to the seal, so that the handle and the seal remain relatively stationary.

[0007] Furthermore, the locking component includes a limiting member and a locking member. The limiting member and the locking member cooperate to wrap around the periphery of the sealing member. The limiting member has at least one limiting groove for accommodating the handle. The locking member is detachably installed on the limiting member so that the limiting member and the sealing member remain relatively stationary.

[0008] Furthermore, the limiting component includes a main body and limiting rods, with multiple limiting rods mounted on the main body, and a slot for accommodating a sealing element provided between adjacent limiting rods, the limiting slot being formed on the main body.

[0009] Furthermore, a transparent cover plate is installed on the main body.

[0010] Furthermore, the locking component includes a bolt and a nut. Each of the limiting rods has a through hole. The bolt passes through at least two of the through holes and cooperates with at least two of the limiting rods and the main body to wrap around the sealing component. The nut is installed on the bolt through a threaded pair.

[0011] Furthermore, the locking component includes a limiting plate, which has limiting holes corresponding to the limiting rods, and a plurality of the limiting rods are inserted into the limiting holes.

[0012] Furthermore, the locking element includes a blocking rod that magnetically attaches between adjacent limiting rods.

[0013] Furthermore, a second valve is detachably installed on the seal to control the connection or blockage between the pressure detection device and the vent, and the locking component is detachably installed on the second valve.

[0014] Furthermore, the seal is provided with an exhaust port, and a third valve is detachably installed on the seal. The third valve controls whether the exhaust port is connected to or blocked from the vent. The locking component is detachably installed on the third valve.

[0015] The following are the beneficial effects of implementing this utility model:

[0016] This application utilizes a detachable seal mounted on the drain outlet of the stator coil. The seal contains a vent channel communicating with the drain outlet, and an inflation port is detachably mounted on the seal, connected to an inflation device. Air is injected into the stator coil through the vent channel. During inflation, any leaks in the stator coil can be checked, allowing for timely maintenance. This facilitates installation by testing personnel, makes it easier to confirm the maintenance location of the stator coil, improves the efficiency and accuracy of airtightness testing during maintenance, and reduces labor intensity. After maintenance, dry gas can be injected into the stator coil through the inflation port, filling it completely. Then, the first valve is turned to block the connection between the inflation port and the vent channel. Because the stator coil is filled with dry gas, external humid gas is less likely to enter, preventing corrosion and thus providing a certain degree of maintenance, extending the service life of the stator coil. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] In the attached image:

[0019] Figure 1 This is a schematic diagram of the structure of the generator stator coil airtightness testing tool in some embodiments of this utility model;

[0020] Figure 2 This is a schematic diagram of the seal and rope in this utility model;

[0021] Figure 3 This is a structural schematic diagram of the sealing element and locking assembly in this utility model;

[0022] Figure 4 This is a schematic diagram showing the relative positions of the limiting groove and the handle in this utility model;

[0023] Figure 5 This is a structural schematic diagram of the main body and the limiting rod in this utility model;

[0024] Figure 6 This is a schematic diagram of the bolt and nut in this utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the blocking rod in this utility model.

[0026] Explanation of markings in the diagram

[0027] 1. Seal, 11. Vent, 12. Inflation port, 13. Exhaust port, 2. Pressure detection device, 3. First valve, 3. Handle, 31. Locking assembly, 4. Rope, 41. Limiting component, 42. Main body, 421. Limiting rod, 422. Slot, 423. Transparent cover, 424. Locking component, 43. Bolt, 431. Nut, 432. Limiting plate, 433. Limiting hole, 434. Blocking rod, 435. Limiting groove, 44. Second valve, 5. Third valve, 6. Detailed Implementation

[0028] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0029] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0031] Please see Figures 1 to 5The generator stator coil airtightness testing tool in the first embodiment of this utility model includes: a sealing element 1, a pressure detection device 2, a first valve 3, and a locking component 4. The sealing element 1 is detachably installed on the drain port of the stator coil. A vent 11 communicating with the drain port is provided inside the sealing element 1. An air inlet 12 is detachably installed on the sealing element 1 and is connected to an air filling device. The pressure detection device 2 is detachably installed on the sealing element 1 and is connected to the vent 11. The first valve 3 is installed on the sealing element 1 to control the connection or blockage between the air inlet 12 and the vent 11. The locking component 4 is detachably installed on the first valve 3 to restrict the rotation of the handle 31 of the first valve 3 and lock the first valve 3 in the connection or blockage position.

[0032] This application utilizes a detachable sealing element 1 installed on the stator coil drain outlet. The sealing element 1 contains a vent 11 communicating with the drain outlet, and an inflation port 12 is detachably installed on it, connected to an inflation device. The inflation port 12 can be a quick connector, facilitating rapid connection between the inflation port 12 and the inflation device, thus improving testing efficiency. The inflation device can be an air pump for easy operation. During maintenance testing, the drain pipe at the stator coil drain outlet is first removed. Then, the flange on the top of the sealing element 1 is connected to the stator coil drain outlet. The inflation device is then connected to the inflation port 12, and air is injected into the vent 11, which in turn inflates the stator coil. During inflation, the stator coil is checked for leaks, and maintenance is performed promptly. This facilitates installation by testing personnel, allows for easy confirmation of the stator coil maintenance location, improves the efficiency and accuracy of airtightness testing during maintenance, and reduces labor intensity.

[0033] This application utilizes a pressure detection device 2, which is detachably mounted on the seal 1 and connected to the vent 11. The pressure detection device 2 can be a pressure gauge. After the stator coil is pressurized, the pressure detection device 2, connected to the vent 11, will display a value. When pressurization stops, the test personnel can more accurately determine whether there is a leak in the stator coil by observing the change in the pressure value of the pressure detection device 2, allowing for timely maintenance and further improving the accuracy of the inspection and testing results while reducing labor intensity.

[0034] This application uses a first valve 3 installed on the sealing element 1 to control the connection or blockage between the air inlet 12 and the ventilation channel 11. A locking component 4 is detachably installed on the first valve 3, restricting the rotation of the handle 31 of the first valve 3 and locking the first valve 3 in the connection or blockage position. After the stator coil is filled with air, the first valve 3 can be used to block the connection between the air inlet 12 and the ventilation channel 11. Then, the change in the pressure detection device 2 is observed to check for leaks in the stator coil, thus saving energy consumption and maintenance costs. After maintenance, dry gas can be injected into the stator coil through the air inlet 12 to fill it completely. Then, the first valve 3 is rotated to block the connection between the air inlet 12 and the ventilation channel 11. Because the stator coil is filled with dry gas, external humid gas is less likely to enter, preventing corrosion and thus providing some maintenance and extending the service life of the stator coil.

[0035] The locking component 4, which is detachably installed on the first valve 3, can lock the first valve 3 in the connected or blocked position by restricting the rotation of the handle 31, thereby preventing unauthorized personnel from accidentally touching the first valve 3 and turning the handle 31, thus improving safety. It can also prevent the first valve 3 from loosening and play a long-term maintenance role for the stator coil.

[0036] Please see Figure 1 and Figure 2 In some embodiments, the locking component 4 is a rope 41, one end of which is wrapped around and fixed to the handle 31 of the first valve 3, and the other end of which is wrapped around and fixed to the seal 1, so that the handle 31 and the seal 1 remain relatively stationary.

[0037] This application uses a locking component 4 as a rope 41. One end of the rope 41 is wrapped and fixed to the handle 31 of the first valve 3, and the other end of the rope 41 is wrapped and fixed to the seal 1, so that the handle 31 and the seal 1 remain relatively stationary. The rope 41 is cheaper to manufacture, can be made from local materials, and the winding method can be changed according to the on-site usage environment, further expanding the scope of application.

[0038] Please see Figures 1 to 5 In some embodiments, the locking component 4 includes a limiting member 42 and a locking member 43. The limiting member 42 and the locking member 43 cooperate to wrap around the periphery of the sealing member 1. The limiting member 42 has at least one limiting groove 44 for accommodating the handle 31. The locking member 43 is detachably installed on the limiting member 42 so that the limiting member 42 and the sealing member 1 remain relatively stationary.

[0039] This application uses a limiting member 42 and a locking member 43 to enclose the outer periphery of the sealing member 1. The limiting member 42 has at least one limiting groove 44 for accommodating the handle 31. The locking member 43 is detachably installed on the limiting member 42. The handle 31 is locked in the limiting groove 44, and then the locking member 43 is fixedly installed on the limiting member 42, so that the limiting member 42 and the locking member 43 cooperate to enclose the outer periphery of the sealing member 1. By using the clamping of the limiting member 42 and the locking member 43, the locking component 4 and the sealing member 1 remain relatively stationary. The handle 31 locked in the limiting groove 44 also remains relatively stationary. Unauthorized personnel cannot rotate the handle 31 without disassembling the limiting member 42 and the locking member 43, thereby improving safety, facilitating operation by maintenance and testing personnel, and improving installation efficiency.

[0040] Please see Figures 1 to 5 In some embodiments, the limiting member 42 includes a main body 421 and a limiting rod 422. Multiple limiting rods 422 are installed on the main body 421. A slot 423 for accommodating the sealing member 1 is provided between adjacent limiting rods 422. A limiting groove 44 is formed on the main body 421.

[0041] This application utilizes multiple limiting rods 422 mounted on the main body 421, with slots 423 for accommodating the sealing element 1 between adjacent limiting rods 422. Limiting grooves 44 are formed on the main body 421. By using the slots 423 between the limiting rods 422 to accommodate the sealing element 1, the limiting element 42 is inserted into the sealing element 1 via the limiting rods 422. Under the action of the limiting rods 422, the limiting element 42 will not rotate relative to the first valve 3, locking the handle 31 within the limiting groove 44. Then, the locking element 43 locks the limiting rods 422, keeping the limiting element 42 and the first valve 3 relatively stationary, thus facilitating operation and improving safety. By restricting the rotation of the limiting element 42 through the slots 423, the locking assembly 4 can be applied to different models of the first valve 3, expanding its application range.

[0042] Please see Figures 1 to 5 In some embodiments, a transparent cover plate 424 is installed on the main body 421.

[0043] This application installs a transparent cover plate 424 on the main body 421. The transparent cover plate 424 can prevent dust from contaminating the handle 31 of the first valve 3, thereby extending the service life of the first valve 3 and making it easier for the test personnel to rotate the handle 31. The transparent cover plate 424 can also allow the test personnel to observe the rotation status of the handle 31, which is convenient for inspection and recording.

[0044] Please see Figure 1 and Figure 6In some embodiments, the locking member 43 includes a bolt 431 and a nut 432. Each limiting rod 422 has a through hole. The bolt 431 passes through at least two through holes and cooperates with at least two limiting rods 422 and the main body 421 to wrap around the sealing member 1. The nut 432 is installed on the bolt 431 through a threaded pair.

[0045] This application features through holes on each limiting rod 422, through which bolts 431 pass. Bolts 431 mate with at least two of the through holes, engaging with at least two limiting rods 422 and the main body 421 to enclose the seal 1. Nuts 432 are threaded onto the bolts 431. The bolts 431 and nuts 432 are easy to manufacture, have low manufacturing costs, save on production costs, can be replaced promptly after wear, facilitate installation, and reduce labor intensity.

[0046] In some embodiments, a lock hole can be made at the end of the bolt 431 near the nut 432, and then the lock head can be passed through the lock hole to lock it. Without the corresponding key, the lock head cannot be opened and the bolt 431 cannot be removed, preventing unauthorized personnel from accidentally touching it and further improving security.

[0047] Please see Figures 1 to 5 In some embodiments, the locking member 43 includes a limiting plate 433, on which a limiting hole 434 corresponding to the limiting rod 422 is provided, and a plurality of limiting rods 422 are inserted into the limiting hole 434.

[0048] This application utilizes a limiting plate 433 with limiting holes 434 corresponding to the limiting rods 422. Multiple limiting rods 422 are inserted into the limiting holes 434. The limiting plate 433 increases the area of ​​the sealing element 1 surrounded by the limiting member 42 and the locking member 43, improving the connection strength between them and thus enhancing the stability of the locking assembly 4 in locking the handle 31, further improving safety. Furthermore, by changing the distance at which the limiting rods 422 are inserted into the limiting plate 433, the limiting member 42 can be adapted to different types of sealing elements 1 or the first valve 3, further expanding its applicability.

[0049] Please see Figure 1 and Figure 7 In some embodiments, the locking member 43 includes a blocking bar 435 that magnetically attaches between adjacent limiting bars 422.

[0050] This application uses a magnetic attraction to attach a blocking rod 435 between adjacent limiting rods 422. By utilizing the magnetic attraction function, the blocking rod 435 can be easily installed between adjacent limiting rods 422, which can further improve the installation efficiency and reduce labor intensity.

[0051] Please see Figures 1 to 3In some embodiments, a second valve 5 is detachably installed on the seal 1 to control the connection or blockage between the pressure detection device 2 and the vent 11, and a locking component 4 is detachably installed on the second valve 5.

[0052] This application controls the connection or blockage between the pressure detection device 2 and the ventilation channel 11 by using a second valve 5 detachably installed on the sealing element 1. The second valve 5 can block the connection between the pressure detection device 2 and the ventilation channel 11. When the pressure detection device 2 is damaged, the connection can be closed using the second valve 5, allowing for replacement of the pressure detection device 2, thus facilitating operation and reducing energy consumption. The locking component 4 detachably installed on the second valve 5 prevents unauthorized personnel from accidentally activating it, further improving safety and the accuracy of the airtightness test results.

[0053] Please see Figures 1 to 3 In some embodiments, the seal 1 is provided with an exhaust port 13, and a third valve 6 is detachably installed on the seal 1. The third valve 6 controls the exhaust port 13 to communicate with or block the vent 11, and a locking component 4 is detachably installed on the third valve 6.

[0054] This application provides an exhaust port 13 on the sealing element 1, and a third valve 6 is detachably installed on the sealing element 1. When venting is required, the inflation device does not need to be removed from the inflation port 12, and venting can be performed through the exhaust port 13, which is convenient for test personnel to operate and adjust the air pressure. The locking component 4, which is detachably installed on the third valve 6, can prevent unauthorized personnel from accidentally touching the third valve 6, further improving safety and the accuracy of the airtightness test results.

[0055] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A generator stator coil air tightness test tool characterized by, The utility model relates to a sealing device for stator coil, including: Sealing piece (1), pressure detection device (2), first valve (3) and locking assembly (4); The sealing piece (1) is detachably installed on the drain port of stator coil, and the sealing piece (1) is provided with a vent passage (11) communicated with the drain port;The inflation port (12) is detachably installed on the sealing piece (1), and the inflation port (12) is communicated with the inflation device; The pressure detection device (2) is detachably installed on the sealing piece (1) and communicated with the vent passage (11); The first valve (3) is installed on the sealing piece (1) and controls the communication or blockage of the inflation port (12) and the vent passage (11); The locking assembly (4) is detachably installed on the first valve (3) and limits the rotation of the handle (31) of the first valve (3) to lock the first valve (3) in the communication or blockage position.

2. The generator stator coil air tightness test tool of claim 1, wherein, The locking assembly (4) is a rope (41), one end of the rope (41) is wound and fixed on the handle (31) of the first valve (3), and the other end of the rope (41) is wound and fixed on the sealing piece (1), so that the handle (31) and the sealing piece (1) remain relatively stationary.

3. The generator stator coil air tightness test tool of claim 1, wherein, The locking assembly (4) includes a limiting piece (42) and a locking piece (43), the limiting piece (42) and the locking piece (43) are wrapped around the periphery of the sealing piece (1), at least one limiting groove (44) for accommodating the handle (31) is formed on the limiting piece (42), and the locking piece (43) is detachably installed on the limiting piece (42) to keep the limiting piece (42) and the sealing piece (1) relatively stationary.

4. The generator stator coil air tightness test tool of claim 3, wherein, The limiting piece (42) includes a main body (421) and a limiting rod (422), a plurality of limiting rods (422) are installed on the main body (421), a clamping groove (423) for accommodating the sealing piece (1) is arranged between adjacent limiting rods (422), and the limiting groove (44) is formed on the main body (421).

5. The generator stator coil air tightness test tool of claim 4, wherein, A transparent cover plate (424) is installed on the main body (421).

6. The generator stator coil air tightness test tool of claim 4, wherein, The locking piece (43) includes a bolt (431) and a nut (432), a through hole is formed on each limiting rod (422), the bolt (431) passes through at least two through holes and cooperates with at least two limiting rods (422) and the main body (421) to wrap around the sealing piece (1), and the nut (432) is installed on the bolt (431) through a threaded pair.

7. The generator stator coil air tightness testing tool of claim 4, wherein, The locking piece (43) includes a limiting plate (433), the limiting plate (433) is provided with a limiting hole (434) corresponding to the limiting rod (422), and a plurality of limiting rods (422) are inserted into the limiting hole (434) correspondingly.

8. The generator stator coil air tightness testing tool of claim 4, wherein, The locking piece (43) includes a blocking rod (435) magnetically attracted between adjacent limiting rods (422).

9. The generator stator coil air tightness test tool of claim 1, wherein, A second valve (5) is detachably installed on the sealing member (1) to control the communication or blockage between the pressure detecting device (2) and the air passage (11), and the locking assembly (4) is detachably installed on the second valve (5).

10. The generator stator coil air tightness test tool of claim 1, wherein, An exhaust port (13) is arranged on the sealing member (1), a third valve (6) is detachably installed on the sealing member (1), the third valve (6) controls the communication or blockage between the exhaust port (13) and the air passage (11), and the locking assembly (4) is detachably installed on the third valve (6).

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