Evaporative cooling water turbine generator stator bar airtight test device

Abstract

The utility model discloses an air tightness test device for a stator bar of an evaporative cooling water turbine generator, which relates to the technical field of hydraulic generators and comprises an air inlet pressure gauge connecting assembly and an air outlet pressure gauge connecting assembly which are detachably connected to two ends of a stator bar assembly. The air inlet pressure gauge connecting assembly is detachably connected with the air source storage device through a hose. The airtight test device is reasonable in design, systematically solves the problems that an existing airtight test device for the stator bar of the evaporative cooling water turbine generator is temporary and inconvenient to disassemble and assemble through the detachable air inlet pressure gauge connecting assembly and the detachable air outlet pressure gauge connecting assembly, and can safely and conveniently complete the airtight test of the stator bar.

Description

Technical Field

[0001] The utility model relates to the technical field of hydro-generators, and more specifically to the technical field of an airtight test device for stator bars of an evaporative cooling hydro-generator. Background Art

[0002] When a hydro-generator unit operates with load, the temperatures of the generator stator and rotor will continuously rise due to the existence of thermal load. Therefore, in order to control the temperature rise and temperature uniformity of the stator and rotor, special cooling devices are designed for hydro-generators. The existing cooling methods for stator windings include air cooling, water cooling, and evaporative cooling. Among them, evaporative cooling belongs to the internal cooling technology of the stator windings of hydro-generators, and is equipped with a fully enclosed self-circulating cooling system composed of stator bars, condensers, etc. It is necessary to inject a special evaporative cooling medium into the hollow conductors of the stator bars of the hydro-generator stator winding, and use the principle of gasification heat absorption of the liquid medium to cool. The tightness of the evaporative cooling system of the hydro-generator stator winding directly determines the realization of the function of the evaporative cooling system and the safety of the unit operation. And the core component of the stator winding is the stator bar. Therefore, the tightness of the stator bar is particularly critical, and the tightness of the stator bar is mainly checked through the airtight test of the stator bar. The implementation methods of the existing technical solutions for the airtight test of the stator bars of evaporative cooling hydro-generators are as follows:

[0003] S1. Place the stator bar to be tested on a temporary support frame;

[0004] S2. Select a soft connecting pipe with a size close to that of the stator bar joint;

[0005] S3. Connect the stator bar and the soft connecting pipe, and fasten them tightly with iron wire or other temporary methods;

[0006] S4. Connect the air source and the soft connecting pipe, and fasten them tightly with iron wire or other temporary methods;

[0007] S5. Plug the other end joint of the stator bar;

[0008] S6. Ventilate and pressurize to start the airtight test.

[0009] Based on the connection between the stator bar and the soft connecting pipe and the connection between the air source and the soft connecting pipe are both fixed by winding tightly with iron wire or other temporary methods, there are many uncertainties in leakage points, and the operation is very inconvenient. During the airtight test process, it is often necessary to process multiple times to complete the test of a single stator bar, and the airtight test of the next stator bar has to be repeated in a hit-or-miss manner. Obviously, the currently implemented airtight test device for the stator bars of evaporative cooling hydro-generators lacks systematic design and considerations for convenience and safety in use. Content of the Utility Model

[0010] The object of the utility model is to provide an airtight test device for the stator bars of an evaporative cooling hydrogenerator, so as to solve the technical problems of inconvenient disassembly and assembly of the existing airtight test device for the stator bars of an evaporative cooling hydrogenerator and high manual labor intensity.

[0011] The utility model specifically adopts the following technical solutions to achieve the above object:

[0012] The utility model provides an airtight test device for the stator bars of an evaporative cooling hydrogenerator, which includes an intake pressure gauge connection component and an exhaust pressure gauge connection component detachably connected to both ends of the stator bar assembly. The intake pressure gauge connection component is detachably connected to the gas source storage device through a hose.

[0013] Specifically, it systematically solves the temporariness and uncertainty of the existing airtight test device for the stator bars of an evaporative cooling hydrogenerator, and can safely and conveniently complete the airtight test of the stator bars.

[0014] In one embodiment, quick-release joints are provided at both ends of the hose.

[0015] Specifically, according to the test pressure, a gas source storage device with a reasonable pressure is selected. A pressure regulating valve is installed at the gas source outlet of the gas source storage device. According to the size of the pressure regulating valve, a quick-release joint is designed for mating connection at one end of the hose.

[0016] In one embodiment, the intake pressure gauge connection component includes a first three-way pipe fitting. An adjusting ball valve, a first sealing joint, and a first precision pressure gauge are respectively connected to the three interfaces of the first three-way pipe fitting. The adjusting ball valve is detachably connected to one end of the hose through a quick connector, and the first sealing joint is connected to one end of the stator bar assembly in a threaded sealing manner.

[0017] In one embodiment, the gas source storage device includes a gas cylinder and a pressure regulating valve provided at the outlet of the gas cylinder. The pressure regulating valve is detachably connected to the other end of the hose through a quick connector.

[0018] In one embodiment, the exhaust pressure gauge connection component includes a second three-way pipe fitting. An exhaust valve, a second sealing joint, and a second precision pressure gauge are respectively connected to the three interfaces of the second three-way pipe fitting. The exhaust valve is communicated with the atmosphere, and the second sealing joint is connected to the other end of the stator bar assembly in a threaded sealing manner.

[0019] In one embodiment, the stator bar assembly includes a stator bar main body and external thread joints symmetrically arranged on both sides of the stator bar main body.

[0020] In one embodiment, both the first sealing joint and the second sealing joint are internal thread joints that match the corresponding external thread joints.

[0021] In one embodiment, both the first precision pressure gauge and the second precision pressure gauge uniformly include a pressure measuring system, a transmission mechanism, an indicating device, and a housing.

[0022] Specifically, the pressure measuring elastic element of the precision pressure gauge is processed by a special process to make the performance of the precision pressure gauge stable and reliable. After being debugged in supporting with a high-precision transmission mechanism, it can ensure accurate indication accuracy. The precision pressure gauge is mainly used to calibrate ordinary industrial pressure gauges. The precision pressure gauge can also accurately measure the pressure of non-corrosive, non-crystalline, and non-solidifying media such as copper alloys and alloy structural steels at the process site. A mirror ring (Type A and Type B) is provided under the scale line of the precision pressure gauge, and the reading is clearer and more accurate during use.

[0023] In one embodiment, it further includes a plug that can block the outlet of the exhaust valve.

[0024] The specific implementation steps of the stator bar airtightness test device are as follows:

[0025] Step 1: Design the stator bar airtightness test device for the evaporative cooling hydrogenerator.

[0026] Step 2: Manufacture the stator bar airtightness test device for the evaporative cooling hydrogenerator.

[0027] Step 3: Install the stator bar airtightness test device for the evaporative cooling hydrogenerator.

[0028] Step 4: Ventilate and pressurize the stator bar for leak detection.

[0029] Step 5: Start the stator bar airtightness test.

[0030] Step 6: Record the results of the stator bar airtightness test.

[0031] Step 7: Release the pressure of the stator bar.

[0032] Step 8: Dismantle the stator bar airtightness test device for the evaporative cooling hydrogenerator.

[0033] Step 9: Start the airtightness test for the next stator bar.

[0034] Specifically, the working process is as follows: After the airtight test device is installed, open the air source pressure regulating valve and the connecting pipeline regulating ball valve, and ventilate and pressurize the stator bar. Control the pressurization pressure value by observing the readings of the first precision pressure gauge and the second precision pressure gauge on the connecting pipeline. When the pressure values of the first precision pressure gauge and the second precision pressure gauge are close to the airtight test pressure value, close the air source pressure regulating valve and the connecting pipeline regulating ball valve simultaneously, and detect leaks by observing the changes in the readings of the first precision pressure gauge and the second precision pressure gauge on the connecting pipeline. If there is a decrease in the readings of the first precision pressure gauge and the second precision pressure gauge, it indicates that there is a leak point in the stator bar or the airtight test device. Eliminate the leak point of the airtight test device by the method of applying soapy water to detect leaks.

[0035] After the leak detection is completed, pressurize the airtight pressure of the stator bar to the test pressure value again. Within the specified time, determine whether the airtight test is successfully completed by observing the changes in the readings of the first precision pressure gauge and the second precision pressure gauge on the connecting pipeline, and record the test results.

[0036] After the airtight test is completed, open the exhaust valve at the end plug of the stator bar to exhaust and relieve pressure. After the exhaust is completed, remove the end plug of the stator bar.

[0037] After the exhaust and pressure relief are completed, remove the airtight test device of the stator bar and start the airtight test of the next stator bar.

[0038] The beneficial effects of the present utility model are as follows:

[0039] 1. The present utility model is reasonably designed, and leaks are detected by observing the changes in the readings of the first precision pressure gauge and the second precision pressure gauge on the connecting pipeline. If there is a decrease in the readings of the first precision pressure gauge and the second precision pressure gauge, it indicates that there is a leak point in the stator bar or the airtight test device. Eliminate the leak point of the airtight test device by the method of applying soapy water to detect leaks.

[0040] 2. Systematically solve the temporariness and uncertainty of the existing airtight test device for the stator bar of the evaporative cooling hydrogenerator, and can safely and conveniently complete the airtight test of the stator bar. Brief Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 It is a structural schematic diagram of the present utility model;

[0043] Reference numerals: 1 - gas cylinder, 2 - pressure regulating valve, 3 - quick-change joint, 4 - hose, 5 - exhaust valve, 6 - regulating ball valve, 7 - first precision pressure gauge, 8 - first sealing joint, 9 - stator bar body, 10 - second sealing joint, 11 - second precision pressure gauge. Detailed implementation manners

[0044] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0046] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0047] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", "upper", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of the present utility model is normally placed. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0048] Embodiment 1

[0049] As Figure 1 shown, this embodiment provides an airtight test device for the stator bars of an evaporative cooling hydrogenerator, including an intake pressure gauge connection assembly and an exhaust pressure gauge connection assembly detachably connected to both ends of the stator bar assembly, and the intake pressure gauge connection assembly is detachably connected to the gas source storage device through the hose 4.

[0050] Specifically, it can systematically solve the temporary and uncertain problems of the existing airtight test device for the stator bars of evaporative cooling hydro-generators, and can safely and conveniently complete the airtight test of the stator bars.

[0051] Quick-change joints 3 are provided at both ends of the hose 4.

[0052] Specifically, according to the magnitude of the test pressure, a gas source storage device with a reasonable pressure is selected. A pressure regulating valve 2 is installed at the gas source outlet of the gas source storage device. According to the size of the pressure regulating valve 2, a quick-change joint 3 is designed and connected to one end of the hose 4.

[0053] Embodiment 2

[0054] As Figure 1 shown, this embodiment provides an airtight test device for the stator bars of an evaporative cooling hydro-generator, including an intake pressure gauge connection assembly and an outlet pressure gauge connection assembly detachably connected to both ends of the stator bar assembly. The intake pressure gauge connection assembly is detachably connected to the gas source storage device through the hose 4.

[0055] Quick-change joints 3 are provided at both ends of the hose 4.

[0056] The intake pressure gauge connection assembly includes a first three-way pipe fitting. An adjusting ball valve 6, a first sealing joint 8, and a first precision pressure gauge 7 are respectively connected to the three interfaces of the first three-way pipe fitting. The adjusting ball valve 6 is detachably connected to one end of the hose 4 through a quick connector, and the first sealing joint 8 is connected to one end of the stator bar assembly in a threaded sealing form.

[0057] The gas source storage device includes a gas cylinder 1 and a pressure regulating valve 2 provided at the outlet of the gas cylinder 1. The pressure regulating valve 2 is detachably connected to the other end of the hose 4 through a quick connector.

[0058] Embodiment 3

[0059] As Figure 1 shown, this embodiment provides an airtight test device for the stator bars of an evaporative cooling hydro-generator, including an intake pressure gauge connection assembly and an outlet pressure gauge connection assembly detachably connected to both ends of the stator bar assembly. The intake pressure gauge connection assembly is detachably connected to the gas source storage device through the hose 4.

[0060] Quick-change joints 3 are provided at both ends of the hose 4.

[0061] The intake pressure gauge connection assembly includes a first three-way pipe fitting. An adjusting ball valve 6, a first sealing joint 8, and a first precision pressure gauge 7 are respectively connected to the three interfaces of the first three-way pipe fitting. The adjusting ball valve 6 is detachably connected to one end of the hose 4 through a quick connector, and the first sealing joint 8 is connected to one end of the stator bar assembly in a threaded sealing form.

[0062] The gas source storage device includes a gas cylinder 1 and a pressure regulating valve 2 provided at the outlet of the gas cylinder 1. The pressure regulating valve 2 is detachably connected to the other end of a hose 4 through a quick connector.

[0063] The outlet pressure gauge connection assembly includes a second three-way pipe fitting. An exhaust valve 5, a second sealing joint 10, and a second precision pressure gauge 11 are respectively connected to the three interfaces of the second three-way pipe fitting. The exhaust valve 5 is in communication with the atmosphere, and the second sealing joint 10 is connected to the other end of the stator bar assembly in a threaded sealing manner.

[0064] It also includes a plug that can block the outlet of the exhaust valve 5.

[0065] The stator bar assembly includes a stator bar main body 9 and external thread joints symmetrically arranged on both sides of the stator bar main body 9.

[0066] Both the first sealing joint 8 and the second sealing joint 10 are internal thread joints that cooperate with the corresponding external thread joints.

[0067] Both the first precision pressure gauge 7 and the second precision pressure gauge 11 are composed of a pressure measurement system, a transmission mechanism, an indicating device, and a housing.

[0068] Specifically, the pressure measurement elastic element of the precision pressure gauge is processed by a special process to make the performance of the precision pressure gauge stable and reliable. After being debugged in cooperation with a high-precision transmission mechanism, it can ensure accurate indication accuracy. The precision pressure gauge is mainly used to calibrate ordinary industrial pressure gauges. The precision pressure gauge can also accurately measure the pressure of non-corrosive, non-crystalline, and non-solidifying media such as copper alloys and alloy structural steels at the process site. A mirror ring (type A and type B) is provided under the scale line of the precision pressure gauge, and the reading is clearer and more accurate during use.

[0069] Embodiment 4

[0070] The specific implementation steps of the stator bar airtightness test device disclosed in this embodiment are as follows:

[0071] Step 1: Design an airtightness test device for the stator bar of an evaporative cooling hydrogenerator;

[0072] Step 2: Manufacture an airtightness test device for the stator bar of an evaporative cooling hydrogenerator;

[0073] Step 3: Install an airtightness test device for the stator bar of an evaporative cooling hydrogenerator;

[0074] Step 4: Ventilate and pressurize the stator bar for leak detection;

[0075] Step 5: Start the airtightness test of the stator bar;

[0076] Step 6: Record the results of the airtightness test of the stator bar;

[0077] Step 7: Depressurize the stator bar.

[0078] Step 8: Remove the airtight test device for the stator bar of the evaporative cooling hydrogenerator.

[0079] Step 9: Start the airtight test for the next stator bar.

[0080] Specifically, the working process is as follows: After the airtight test device is installed, open the air source pressure regulating valve 2 and the connecting pipeline regulating ball valve 6, and ventilate and pressurize the stator bar. Control the pressurization pressure value by observing the readings of the first precision pressure gauge and the second precision pressure gauge on the connecting pipeline. When the pressure values of the first precision pressure gauge and the second precision pressure gauge are close to the airtight test pressure value, close the air source pressure regulating valve 2 and the connecting pipeline regulating ball valve 6 simultaneously, and detect leaks by observing the changes in the readings of the first precision pressure gauge and the second precision pressure gauge on the connecting pipeline. If the readings of the first precision pressure gauge and the second precision pressure gauge show a decrease, it indicates that there is a leak point in the stator bar or the airtight test device. Eliminate the leak point of the airtight test device by applying soapy water for leak detection.

[0081] After the leak detection is completed, pressurize the airtight pressure of the stator bar to the test pressure value again. Within the specified time, determine whether the airtight test is successfully completed by observing the changes in the readings of the first precision pressure gauge and the second precision pressure gauge on the connecting pipeline, and record the test results.

[0082] After the airtight test is completed, open the exhaust valve 5 at the end plug of the stator bar to exhaust and depressurize. After the exhaust is completed, remove the end plug of the stator bar.

[0083] After the exhaust and depressurization are completed, remove the airtight test device for the stator bar and start the airtight test for the next stator bar.

Claims

1. An evaporative cooling turbine generator stator bar airtightness test device, characterized in that: The invention comprises an air intake pressure gauge connection assembly and an air outlet pressure gauge connection assembly which are detachably connected to the two ends of a stator wire rod assembly, wherein the air intake pressure gauge connection assembly is detachably connected to an air source storage device via a hose (4); both ends of the hose (4) are provided with quick-change joints (3); the air intake pressure gauge connection assembly comprises a first three-way pipe fitting, wherein three interfaces of the first three-way pipe fitting are respectively connected to a regulating ball valve (6), a first sealing joint (8) and a first precision pressure gauge (7); the regulating ball valve (6) is detachably connected to one end of the hose (4) via a quick joint, and the first sealing joint (8) is connected to one end of the stator wire rod assembly via a threaded seal.

2. The evaporative cooling turbine generator stator wire bar airtightness test device according to claim 1 is characterized in that: The gas source storage device comprises a gas cylinder (1) and a pressure regulating valve (2) arranged at the outlet of the gas cylinder (1); the pressure regulating valve (2) is detachably connected to the other end of the hose (4) via a quick connector.

3. The evaporative cooling turbine generator stator wire bar airtightness test device according to claim 2 is characterized in that: The outlet pressure gauge connection assembly comprises a second three-way pipe fitting, the three interfaces of which are respectively connected to an exhaust valve (5), a second sealing joint (10) and a second precision pressure gauge (11), the exhaust valve (5) being in communication with the atmosphere, and the second sealing joint (10) being connected to the other end of the stator bar assembly via a threaded seal.

4. The evaporative cooling turbine generator stator wire bar airtightness test device according to claim 3 is characterized in that: The stator wire bar assembly comprises a stator wire bar body (9) and external thread joints symmetrically arranged on both sides of the stator wire bar body (9).

5. The evaporative cooling turbine generator stator wire bar airtightness test device according to claim 4 is characterized in that: The first sealing joint (8) and the second sealing joint (10) are both internal thread joints that match the corresponding external thread joints.

6. The evaporative cooling turbine generator stator wire bar airtightness test device according to claim 3, characterized in that: The first precision pressure gauge (7) and the second precision pressure gauge (11) each comprise a pressure measuring system, a transmission mechanism, an indicating device and a casing.

7. The evaporative cooling turbine generator stator wire bar airtightness test device according to claim 3 is characterized in that: It also includes a plug capable of blocking the outlet of the exhaust valve (5).

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