A multi-station dewing test device and method

Abstract

The present application relates to the technical field of generator set dew test, and discloses a multi-station dew test device and method, which comprises a constant temperature and humidity measuring box with a mounting cavity, a constant temperature water tank mounted in the mounting cavity, a humidifier connected with the mounting cavity, a constant temperature water supply device connected with the constant temperature water tank, a heating module and a refrigeration module mounted in the mounting cavity, a temperature and humidity sensor mounted in the mounting cavity and used for detecting the humidity and temperature in the mounting cavity, and a control unit connected with the humidifier, the constant temperature water supply device, the heating module, the refrigeration module and the temperature and humidity sensor respectively. The present application can effectively simulate the high-temperature and high-humidity air environment and the low-temperature water environment of the generator set, and make the test environment at both ends of the sample as close as possible to the real working condition of the generator set, thereby improving the accuracy of the dew test result.

Description

Technical Field

[0001] This invention relates to the field of generator set condensation testing technology, and more specifically, to a multi-station condensation testing device and method. Background Technology

[0002] Axial-flow turbine generator sets operate in high-temperature and high-humidity environments. The components in contact with water are all thin-walled metal parts, making them prone to condensation and dripping during operation, affecting the cleanliness of the unit. Simultaneously, the increased humidity inside the stator and rotor chambers after shutdown reduces insulation performance. For many years, axial-flow turbines have used anti-condensation paint sprayed on the metal walls to absorb condensation and release moisture when the ambient temperature and humidity are suitable, creating a cycle. However, the relatively sealed interior of the bulb makes it difficult to change the air environment, and over time, the anti-condensation paint loses its effectiveness, making condensation a common problem in axial-flow turbine power plants. With improvements in unit performance, owners are increasingly concerned about the cleanliness of the unit, and condensation on electrical components such as the stator bars after shutdown also affects the normal startup of the power plant.

[0003] To effectively improve the cleanliness level of the generator unit and ensure that the insulation performance of electrical components is not damaged by condensation, in-depth research on the anti-condensation performance testing and verification technology of axial-flow hydro generators is particularly important. The unique operating environment of axial-flow hydro generators presents them with severe challenges: one side is adjacent to a low-temperature water environment of approximately 18°C, while the other side is exposed to high-temperature and high-humidity air of approximately 35°C with humidity maintained between 70% and 75%. Such temperature difference and humidity conditions easily induce condensation problems. However, currently widely used traditional condensation test chambers have design limitations; they can only simulate a constant-temperature and constant-humidity air environment and cannot create a comprehensive test scenario that includes a low-temperature and constant-temperature water environment. This deficiency clearly cannot meet the complex environmental conditions encountered by axial-flow hydro generators in actual operation. Therefore, technological innovation of traditional condensation test chambers to adapt to more demanding testing requirements has become an urgent task.

[0004] Through technological improvements, the aim is to develop a test device that can simultaneously simulate low-temperature water environments and high-temperature, high-humidity air environments, thereby providing a more accurate and comprehensive verification method for the anti-condensation performance of axial-flow hydro generators. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a multi-station condensation testing device and method, which can effectively simulate the high temperature and high humidity air environment and low temperature water environment of generator sets, and make the test environment at both ends of the sample as close as possible to the actual operating conditions of generator sets, thereby improving the accuracy of condensation test results; The solution adopted by this invention to solve the technical problem is: A multi-station condensation testing device includes a constant temperature and humidity measuring chamber with an installation cavity, a constant temperature water tank installed in the installation cavity, a humidifier connected to the installation cavity, a constant temperature water supply device connected to the constant temperature water tank, a heating module and a cooling module installed in the installation cavity, a temperature and humidity sensor installed in the installation cavity for detecting the humidity and temperature in the installation cavity, and a control unit connected to the humidifier, the constant temperature water supply device, the heating module, the cooling module, and the temperature and humidity sensor respectively. During testing, one end of the sample is mounted on a constant temperature water tank, which simulates a low-temperature water environment. Since the constant temperature and humidity measuring chamber simulates a high-temperature and high-humidity air environment, the entire constant temperature water tank and the sample are located inside the mounting cavity. This means that the other side of the sample is in a high-temperature and high-humidity air environment, thus effectively simulating the working environment of the generator set. Consequently, the test environment on both sides of the sample is as close as possible to the actual operating conditions of the generator set, improving the accuracy of the condensation test results. Before testing, the temperature and humidity sensor monitors the humidity and temperature inside the installation cavity and controls the humidifier, cooling module, and heating module through the control unit to adjust them until the test environment requirements are met; thus enabling the testing of the sample.

[0006] In some possible implementations, to facilitate the installation of the constant temperature water tank, a device door for opening and closing the installation cavity is provided on the constant temperature and humidity measuring chamber, and a platform is provided at the bottom of the installation cavity; the constant temperature water tank is installed on the platform; the constant temperature and humidity measuring chamber is provided with a drain outlet communicating with the inside of the installation cavity and a moisture inlet communicating with a humidifier. To facilitate airflow within the mounting cavity, a fan assembly is provided inside the mounting cavity to enable airflow.

[0007] In some possible implementations, in order to effectively simulate a low-temperature water environment using a constant-temperature water tank, the constant-temperature water tank includes an insulated base installed in an installation cavity and provided with an installation groove, a water tank installed in the installation groove, and an insulated top cover installed on the insulated base and positioned above the water tank; a base inlet and a base outlet are respectively provided on the side wall of the insulated base and communicate with the installation groove; the base inlet and base outlet are respectively connected to a constant-temperature water supply device; and a test area communicating with the water tank is provided on the insulated top cover.

[0008] In some possible implementations, the water tank includes an outer box installed in the mounting groove and communicating with the water outlet of the base, an inner box installed in the outer box and provided with a water storage cavity, and a platform provided on the top surface of the inner box and corresponding to the test area; An inner tank water inlet is provided on the inner side wall of the inner tank, which communicates with the base water inlet; an outer tank water outlet is provided on the inner side wall of the outer tank, which communicates with the base water outlet; the top of the water storage cavity has an opening, and the top surface of the inner tank is located above the outer tank.

[0009] In some possible implementations, multiple sets of thermocouples for temperature testing are provided in the test area, and the thermocouples are connected to an external testing instrument.

[0010] In some possible implementations, the heat-insulating base and heat-insulating top cover are made of mullite or foam material; when mullite is used to make the heat-insulating base and heat-insulating top cover, a waterproof layer is coated on the surface of the heat-insulating base and heat-insulating top cover.

[0011] In some possible implementations, the gap between the test area and the sample is filled with insulating asbestos fibers, insulating foam, or drip-insulated insulating adhesive.

[0012] In some possible implementations, the test area is in multiple groups.

[0013] A method for testing condensation at multiple workstations in a generator set, based on the aforementioned multi-station condensation testing device for generator sets, specifically includes the following steps: Step S1: Install a set of thermocouples at the interface between the metal of the sample coated with the anti-corrosion and anti-condensation paint underlayer and the heat insulation and anti-condensation top layer. Step S2: Assemble the constant temperature water tank, install and fix a set of thermocouples on the heat insulation and anti-condensation coating, and install and fix a set of thermocouples on the underside of the sample. Step S3: Install the constant temperature water tank in the installation cavity, connect the thermocouple to the tester, connect the constant temperature water tank to the constant temperature water supply equipment, and connect the humidifier to the constant temperature and humidity measuring chamber. Step S4: The test is conducted using a constant temperature and humidity measuring chamber, a constant temperature water supply device, a humidifier, and a testing instrument. During the test, the humidifier introduces water mist into the constant temperature and humidity measuring chamber to provide the humidity conditions for the condensation test. The constant temperature water supply device supplies water into the water tank so that the water surface contacts the bottom of the sample. In some possible implementations, step S4 specifically refers to: setting the temperature of the constant temperature and humidity measuring chamber and the relative humidity to 70%~75% through the control unit; and conducting a condensation test after the constant temperature water supply equipment returns water and the temperature of the constant temperature and humidity measuring chamber reaches 18°C. During testing, temperature and humidity sensors detect the ambient temperature and humidity inside the constant temperature and humidity measurement chamber and transmit the data to the control unit. The control unit analyzes and processes the data and adjusts the humidity and temperature. Multiple thermocouples are used to detect the temperature of the heat insulation and anti-condensation coating interface, surface temperature, and water tank temperature.

[0014] In some possible implementations, during testing, when the temperature and humidity sensor detects that the actual temperature is lower than the set temperature, the control unit activates the heating module to heat up and adjust the actual temperature to the set temperature. When the actual temperature is higher than the set temperature, the control unit starts the cooling module to cool down and adjust the actual temperature to the set temperature. When the actual humidity is lower than the set humidity, the control unit starts the humidifier to humidify and adjust the actual humidity to the set humidity. When the actual humidity is higher than the set humidity, the control unit starts the cooling module to cool down and adjust the actual humidity to the set humidity. Under the action of the cooling module, water mist condenses into water and is discharged through the drain. The test ends when the constant temperature and humidity measuring chamber has run for the set time.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention uses a constant temperature and humidity measuring chamber to simulate the high temperature and high humidity air environment on one side of the generator set's working environment, and a constant temperature water tank to simulate the low temperature water environment on the other side of the generator set's working environment, thereby ensuring that the test environment on both sides of the sample is as close as possible to the actual generator set's working conditions, and improving the accuracy of the condensation test results. This invention provides a high-temperature and high-humidity air environment by connecting a humidifier and setting up a heating and cooling module in a constant temperature and humidity measuring chamber. Combined with the setting of temperature and humidity sensors and temperature and humidity controllers, the temperature and humidity in this environment are accurately and timely measured and adjusted, thereby accurately simulating the high-temperature and high-humidity air environment on one side of the generator set's working environment and improving the accuracy of simulating the high-temperature and high-humidity air environment. This invention sets up a constant temperature water tank as a combination structure of an insulated base, a water tank, and an insulated top cover, and sets up the water tank as an inner and outer double-layer structure, thereby separating the sample placement stage from other structural components, reducing environmental interference, and improving the independence and stability of the sample testing process; at the same time, by setting the inner water tank higher than the outer water tank, the flowing water in the inner water tank after interacting with the sample overflows, ensuring the cooling effect of the flowing water, thereby quickly achieving a low temperature water environment, shortening the condensation test time, and improving the condensation test efficiency; This invention increases the number of testing stations by arranging multiple platforms in parallel on the upper surface of the inner box and opening two or more test areas corresponding to one platform on the insulated top cover. This allows for the simultaneous condensation testing of multiple samples, greatly improving the efficiency of condensation testing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the constant temperature and humidity measuring chamber in the multi-station condensation testing device of the present invention; Figure 2This is a front sectional view of the constant temperature and humidity measuring chamber in the multi-station condensation testing device of the present invention. Figure 3 This is an exploded view of the constant temperature water tank in the multi-station condensation testing device of the present invention. Figure 4 This is an exploded cross-sectional view of the front structure of the constant temperature water tank in the multi-station condensation testing device of the present invention. Figure 5 This is a schematic diagram of the sample testing conditions for the multi-station condensation testing device of the present invention; Figure 6 This is a block diagram illustrating the control principle of the multi-station condensation testing device of the present invention. The components include: 1. Equipment door; 2. Moisture inlet; 3. Cabinet; 4. Drain outlet; 5. Platform; 6. Auxiliary outlet; 7. First fan; 8. Second fan; 9. Lighting; 10. Third fan; 11. Heating module; 12. Cooling module; 13. Insulated base; 14. Water tank; 141. Outer casing; 142. Inner casing; 15. First platform; 16. First water tank inlet; 17. Insulated top cover; 18. First test area; 19. Second test area. 20. Second water tank inlet; 21. Third water tank inlet; 22. Second platform; 23. Fourth water tank inlet; 24. Outer tank outlet; 25. Base inlet; 26. Base outlet; 27. Base bottom surface; 28. Base inner surface; 29. ​​Water tank bottom surface; 30. Bottom surface of bottom cover; 31. Base upper surface; 32. Humidifier; 33. Constant temperature water supply equipment; 34. Temperature and humidity display; 35. Control unit; 36. Temperature and humidity sensor. Detailed Implementation

[0017] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., 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 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. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0018] The present invention will now be described in detail.

[0019] like Figures 1-6 As shown: A multi-station condensation testing device includes a constant temperature and humidity measuring chamber for simulating a high temperature and high humidity air environment, a constant temperature water tank located in the constant temperature and humidity measuring chamber for simulating a low temperature water environment, a humidifier 32 for humidifying the installation cavity, a constant temperature water supply device 33 for supplying water to the constant temperature water tank, a temperature and humidity sensor 36 for monitoring humidity and temperature inside the installation cavity, a heating module 11 and a cooling module 12 installed inside the installation cavity, and a control unit 35 connected to the humidifier 32, the constant temperature water supply device 33, the heating module 11, the cooling module 12, and the temperature and humidity sensor 36 respectively. One end of the sample is installed on a constant temperature water tank and the other end is placed in a high temperature and high humidity air environment. This method ensures that the test environment on both sides of the sample is as close as possible to the actual operating conditions of the generator set, thus improving the accuracy of the condensation test results. The constant temperature and humidity measuring chamber includes a box body 3 with a mounting cavity, and a device door 1 for opening and closing the mounting cavity is installed on the front of the box body 3; a fan assembly is installed on the inner side wall of the mounting cavity. Specifically, a first fan 7 is installed on the inner wall of the installation cavity facing the equipment door 1, a second fan 8 is installed on the top wall of the installation cavity, and a third fan 10 is installed on the side wall of the installation cavity. A lighting lamp 9 is also installed above the inner wall of the installation cavity facing the equipment door 1. A platform 5 for installing a constant temperature water tank is installed on the bottom surface of the installation cavity, and a drain outlet 4 connecting to the outside is opened at the bottom of the platform 5. A temperature and humidity sensor 36 is installed directly above the platform 5. A heating module 11 and a cooling module 12 are installed on the platform 5.

[0020] It also includes a temperature and humidity display 34 that is connected to the temperature and humidity sensor 36, the constant temperature water supply equipment 33, and the control unit 35 respectively; the temperature and humidity display 34 is connected to the temperature and humidity sensor 36, the constant temperature water supply equipment 33, and is connected to the control unit 35.

[0021] A moisture inlet 2 for connecting a humidifier 32 is provided on the housing 3, and an auxiliary port 6 for connecting a constant temperature water supply device 33 and a temperature and humidity display 34 is provided on the opposite side wall. The constant temperature water tank includes an insulated base 13 installed on the platform 5, a water tank 14 assembled in the insulated base 13, and an insulated top cover 17 covering the insulated base 13. The side wall of the insulated base 13 is provided with a base water inlet 25 and a base water outlet 26 respectively. The water tank 14 includes an outer box 141 and an inner box 142 fixedly installed in the outer box 141. The height of the inner box 142 is greater than the height of the outer box 141, and the top of the inner box 142 is located above the outer box 141. The inner box 142 has a water storage cavity inside, and the top of the water storage cavity has an opening. A platform is provided on the upper surface of the inner box 142. The inner box 142 has water inlets on its four sides. The outer box 141 has water outlets 24 on its lower side walls. The inner box water inlets are connected to the base water inlets 25, and the outer box water outlets 24 are connected to the base water outlets 26. The thermal insulation top cover 17 has a test area connected to the platform in the area corresponding to the platform, and a thermocouple for temperature measurement is also provided in the test area.

[0022] In this invention, a constant temperature and humidity measuring chamber is set up to simulate the high temperature and high humidity air environment on one side of the generator set's working environment, and a constant temperature chamber is set up to simulate the low temperature water environment on the other side of the generator set's working environment.

[0023] Specifically, the constant temperature and humidity measuring chamber forms an independent testing environment through the chamber 3 with an installation cavity, ensuring that the testing process is stable and unaffected by external interference. The chamber 3 is equipped with an equipment door 1 to open and close the chamber, facilitating the loading and unloading of samples. The installation cavity is equipped with a first fan 7, a second fan 8, and a third fan 10, which promote airflow within the chamber, thereby rapidly achieving uniform temperature and humidity. At the same time, an illumination lamp 9 is installed above the installation cavity to provide lighting, facilitating accurate operation within the chamber 3. Platform 5 is set on the bottom surface inside the chamber 3 as the main area for condensation testing, and is used to hold a constant temperature water tank containing the sample. Temperature and humidity sensor 36 is set directly above the platform 5 and close to the sample to accurately measure the temperature and humidity of the simulated high temperature and high humidity air environment inside the chamber 3, obtain the temperature and humidity changes in a timely manner, and improve the accuracy of the simulated environment. Heating module 11 and cooling module 12 are set on the platform 5 to heat or cool according to the temperature and humidity changes inside the chamber 3, adjust the temperature and humidity inside the chamber 3 to make it close to the real working environment on the side facing the generator set.

[0024] By opening a moisture inlet 2 on the chamber 3 to connect to a humidifier 32, the water mist generated by the humidifier 32 is introduced into the chamber 3 to provide humidity conditions for a high-temperature and high-humidity air environment. By opening an auxiliary port 6 as a channel, it is convenient to connect the constant temperature water supply equipment 33 to the constant temperature water tank in the constant temperature and humidity measuring chamber. Thus, the constant temperature water supply equipment 33 continuously supplies flowing water into the water storage chamber of the constant temperature water tank to simulate the low-temperature water environment on the other side of the generator set working environment. At the same time, it is convenient to connect the temperature and humidity sensor 36 inside the chamber 3 to the temperature and humidity display 34 outside the chamber 3, so that the temperature and humidity display 34 can monitor and read the real-time temperature and humidity of the high-temperature and high-humidity air environment in a timely manner. By setting the temperature and humidity display 34 to connect to the constant temperature water supply equipment 33, the real-time temperature of the flowing water output from the constant temperature water supply equipment 33 can also be monitored and read in a timely manner. By setting up a control unit 35 and connecting it to a temperature and humidity indicator 34, a humidifier 32, a constant temperature water supply device 33, a heating module 11, and a cooling module 12, the control unit 35 sets the temperature and humidity inside the constant temperature and humidity measurement chamber to simulate a high-temperature and high-humidity air environment, and sets the temperature of the flowing water output from the constant temperature water supply device 33 to simulate a low-temperature water environment. On the other hand, after the real-time temperature of the flowing water output from the constant temperature water supply device 33, monitored by the temperature and humidity indicator 34, is fed back to the control unit 35, the control unit 35 is adjusted to heat / cool the constant temperature water supply device 33 so that the actual outlet water temperature reaches the set outlet water temperature. After the real-time temperature and humidity inside the constant temperature and humidity measurement chamber, monitored by the temperature and humidity indicator 34, are fed back to the control unit 35, the heating module 11 or the cooling module 12 is adjusted to heat or cool the device so that the actual temperature and humidity reach the set outlet water temperature and humidity. This accurately simulates the high-temperature and high-humidity air environment on one side of the generator set's working environment and the low-temperature water environment on the other side, improving the accuracy of the condensation test results.

[0025] The constant temperature water tank includes an insulation base 13, a water tank 14 installed in the insulation base 13, and an insulation top cover 17 installed on the insulation base 13 and located above the water tank 14. By assembling and accommodating the water tank 14 in the insulation base 13, external operation is avoided from interfering with the water tank 14, providing a stable working environment for the water tank 14 and facilitating disassembly and installation. Meanwhile, by designing the water tank 14 as a double-layer structure of inner tank 142 and outer tank 141, and setting a platform on the upper surface of the inner tank 142, the platform used to place the sample is separated from other structural components, reducing environmental interference and improving the independence and stability of the sample testing process. By setting the top surface of the inner tank 142 higher than the top surface of the outer tank 141, it is ensured that the flowing water in the inner tank 142 after acting on the sample overflows from the inner tank 142 and enters the gap between the inner and outer tanks 141, avoiding the long-term action of the sample on the sample, which makes it difficult to cool down quickly, which is not conducive to simulating the low-temperature water environment on the other side of the generator set working environment, prolonging the condensation test time and reducing the condensation test efficiency. By opening an inner tank water inlet on the four sides of the inner tank 142 and an outer tank water outlet 24 on the lower side of the outer tank 141, and connecting them to the base water inlet 25 and base water outlet 26 on the side of the insulation base 13 respectively, the constant temperature water supply equipment 33 can continuously supply flowing water into the inner tank 142 of the constant temperature water tank through the base water inlet 25 and the water tank 14 inlet, and the water will come into contact with the sample on the stage on the upper surface of the inner tank 142. After overflowing, the water will flow out through the water tank 14 outlet 24 and the base water outlet 26 and return to the constant temperature water supply equipment 33, thus realizing the recycling of water and helping to maintain a long-term stable low temperature water environment. Furthermore, a test area connected to the stage is opened on the insulated top cover 17 in the area corresponding to the stage, so that the sample is placed on the stage on the surface of the inner box 142 and fixed in the test area. This ensures that the bottom of the sample is in contact with the flowing water in a low-temperature water environment, while the coating side of the sample is exposed in the high-temperature and high-humidity air environment in the constant temperature and humidity measuring chamber 3. This effectively simulates the different working environments on both sides of the generator set, and also prevents the sample from falling into the flowing water in the inner box 142, further ensuring the stability of the condensation test process. At the same time, it is convenient to observe the condensation on the surface of the sample coating in the test area. Furthermore, by equipping the test area with thermocouples for temperature measurement, the temperature of different parts of the sample is measured to reflect the temperature changes of various parts of the sample during the condensation test, especially the surface of the heat insulation and anti-condensation coating, the interface between the heat insulation and anti-condensation coating and the coating of the anti-corrosion and anti-condensation paint underlayer, and the lower side of the sample (representing the water temperature of water tank 14), thereby obtaining more accurate condensation test results.

[0026] Typically, a first thermocouple is installed at the interface between the heat insulation and anti-condensation coating of the sample and the coating of the anti-corrosion and anti-condensation paint underlayer. Therefore, the size of the test area will be slightly larger than the size of the sample. Heat insulation asbestos fiber, heat insulation foam or heat insulation adhesive can be filled into the gaps of the sample in the test area to fix the sample. Insulation top cover 17 of different thicknesses is provided according to the sample and coating thickness to ensure the stability of the sample placement.

[0027] Preferably, such as Figure 3As shown, a first platform 15 and a second platform 22 are arranged parallel to each other on the upper surface of the inner box 142. A first water inlet 16, a second water inlet 20, a third water inlet 21 and a fourth water inlet 23 are sequentially opened on the four sides of the inner box 142. A first test area 18 and a second test area 19 are respectively opened on the heat-insulating top cover 17 in the areas corresponding to the first platform 15 and the second platform 22. By setting two parallel platforms on the upper surface of the inner box 142 and opening two test areas on the insulated top cover 17, the number of test stations is increased, and multiple samples can be tested for condensation at the same time, which greatly improves the testing efficiency.

[0028] Typically, the dimensions of the stage and test area can be adjusted according to the sample. For example, for a single stage, two or more test areas can be opened on the insulated top cover 17 to further increase the number of test stations and improve the efficiency of condensation testing. Four water inlets are sequentially opened on the four side walls of the inner chamber 142 to improve the flow rate of the flowing water and the uniformity of water temperature, quickly creating a simulated low-temperature water environment.

[0029] Preferably, such as Figure 4 As shown, the bottom surface 27 of the insulated base 13 in the constant temperature water tank is located on the platform 5 in the constant temperature and humidity measuring chamber, the bottom surface 29 of the water tank 14 is located on the inner surface 28 of the base of the insulated base 13, and the bottom surface 30 of the insulated top cover 17 is located on the upper surface 31 of the base of the insulated base 13. The above-mentioned constraints ensure that the constant temperature water tank is located in the main area of ​​the condensation test in the constant temperature and humidity measuring chamber, that is, the sample in the water tank 14 is located in the main area of ​​the condensation test, which improves the accuracy of the condensation test. At the same time, it ensures that the water tank 14 is stably assembled in the insulated base 13 and the insulated top cover 17 is tightly covered on the insulated base 13, forming a stable overall structure, which further improves the stability of the condensation test process.

[0030] Preferably, the insulated base 13 and the insulated top cover 17 are made of mullite and coated with a waterproof layer, or are made of foam material; the water tank 14 is made of plastic or stainless steel. By using mullite or foam material with excellent thermal insulation properties to make the insulated base 13 and the insulated top cover 17, heat loss is reduced and the temperature stability inside the constant temperature water tank is ensured. By coating the surface of the mullite with a waterproof layer, the thermal insulation performance of the mullite is prevented from deteriorating due to water absorption, which would affect the stability of the concentrated low temperature water environment. At the same time, using plastic or stainless steel with excellent waterproof properties to make the water tank 14 avoids corrosion of the water tank 14 by flowing water and extends the service life of the testing device.

[0031] The test method for condensation testing in this invention is as follows: Prepare a sample, i.e., a metal with a heat-insulating and anti-condensation coating on its surface. Insert a first thermocouple at the interface between the metal coated with the anti-corrosion and anti-condensation paint underlayer and the heat-insulating and anti-condensation top layer and fix it in place. The water tank 14 is assembled in the heat-insulating base 13, and the heat-insulating top cover 17 is covered on the heat-insulating base 13. The sample with the first thermocouple is placed in the test area of ​​the heat-insulating top cover 17 and fixed on the work position of the platform in the water tank 14. The heat-insulating and anti-condensation coating on the surface of the sample is flush with the upper surface of the heat-insulating top cover 17. The second thermocouple is installed and fixed on the heat-insulating and anti-condensation coating. The third thermocouple is installed and fixed on the lower side of the sample. The assembly of the sample in the constant temperature water tank is completed. The assembled constant temperature water tank is placed on the platform 5 of the constant temperature and humidity measuring chamber. The connecting wires of the first thermocouple, the second thermocouple and the third thermocouple are led out and connected to the tester through the auxiliary port 6. At the same time, the outlet of the constant temperature water supply device 33 is connected to the base inlet 25 of the insulation base 13 in the constant temperature water tank through the auxiliary port 6, and the inlet is connected to the base outlet 26, thus completing the assembly of the constant temperature water tank in the constant temperature and humidity measuring chamber. Step 4: Turn on the constant temperature and humidity measuring chamber, constant temperature water supply device 33, humidifier 32 and tester. Use the humidifier 32 to input water mist into the chamber 3 of the constant temperature and humidity measuring chamber through the moisture inlet 2 to provide the humidity conditions for condensation test. Use the control unit 35 to set the outlet water temperature of the constant temperature water supply device 33 to 17℃ (considering the loss in the pipeline, this outlet water temperature can ensure that the temperature of the water tank 14 reaches 18℃), and turn on the water outlet switch to deliver flowing water to the base inlet 25 through the outlet of the constant temperature water supply device 33, so that the water surface in the inner chamber 142 contacts the bottom of the sample on the stage. like Figure 5 As shown, the temperature of the constant temperature and humidity measuring chamber is set to 35℃±2℃ and the relative humidity to 70%~75% using the control unit 35. The running time, i.e., the test duration, is 8000 min (greater than 120 h). After the water outlet pipe of the constant temperature water supply equipment 33 returns water and the temperature of the constant temperature and humidity measuring chamber reaches 18℃, the condensation test is started. The temperature and humidity of the air environment inside the constant temperature and humidity measuring chamber are detected by the temperature and humidity display 34. The interface temperature and surface temperature of the heat insulation and anti-condensation coating and the temperature of the water tank 14 are detected by the first thermocouple, the second thermocouple and the third thermocouple, respectively, and the readings are monitored by the tester. During the condensation test, it is observed in time whether condensation occurs on the surface of the sample coating. After the condensation test program is completed, the test is stopped and all equipment and instruments are turned off.

[0032] like Figure 6As shown, during the condensation test, the control unit 35 adjusts and controls the heating or cooling program of the constant temperature water supply equipment 33, and simultaneously adjusts and controls the temperature and humidity of the constant temperature and humidity measuring chamber. Specifically, after the control unit 35 sets the outlet water temperature of the constant temperature water supply equipment 33, the temperature and humidity indicator 34 feeds back the monitored actual outlet water temperature to the control unit 35. When the control unit 35 detects that the actual outlet water temperature is lower than the set outlet water temperature, it controls the constant temperature water supply equipment 33 to heat, adjusting the actual outlet water temperature to the set outlet water temperature. When the control unit 35 detects that the actual outlet water temperature is higher than the set outlet water temperature, it controls the constant temperature water supply equipment 33 to cool, adjusting the actual outlet water temperature to the set outlet water temperature.

[0033] After setting the temperature, ambient humidity, and running time of the constant temperature and humidity measuring chamber, the actual temperature and humidity inside the chamber are detected by the temperature and humidity sensor 36 and displayed on the temperature and humidity display 34. When the actual temperature is lower than the set temperature, the control unit 35 starts the heating module 11 to heat up and adjust the actual temperature to the set temperature. When the actual temperature is higher than the set temperature, the control unit 35 starts the cooling module 12 to cool down and adjust the actual temperature to the set temperature. When the actual humidity is lower than the set humidity, the control unit 35 starts the humidifier 32 to humidify and adjust the actual humidity to the set humidity. When the actual humidity is higher than the set humidity, the control unit 35 starts the cooling module 12 to cool down and adjust the actual humidity to the set humidity. Under the cooling effect, water mist condenses to form water, which is discharged through the drain port 4 at the bottom of the platform 5. Furthermore, once the constant temperature and humidity measuring chamber has run for the set time, the control unit 35 terminates the test program.

[0034] Typically, the constant temperature water supply equipment 33 is a 15L horizontal constant temperature water tank, model THD-0506, purchased from Shaoxing Siyang Instrument Manufacturing Co., Ltd.; the temperature and humidity display 34 is model TP700, purchased from Shenzhen Topray Electronics Co., Ltd.; the control unit 35 is model WSK-Z, purchased from China Chaobo Automation Technology Co., Ltd.; and the temperature and humidity sensor 36 is model RS485, purchased from Shandong Jianda Renke Electronic Technology Co., Ltd.

[0035] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A multi-station condensation testing device, characterized in that, It includes a constant temperature and humidity measuring chamber with an installation cavity, a constant temperature water tank installed in the installation cavity, a humidifier connected to the installation cavity, a constant temperature water supply device connected to the constant temperature water tank, a heating module and a cooling module installed in the installation cavity, a temperature and humidity sensor installed in the installation cavity for detecting the humidity and temperature in the installation cavity, and control units connected to the humidifier, the constant temperature water supply device, the heating module, the cooling module, and the temperature and humidity sensor respectively; The constant temperature water tank includes an insulated base installed in the installation cavity and provided with an installation groove, a water tank installed in the installation groove, and an insulated top cover installed on the insulated base and positioned above the water tank; a base inlet and a base outlet are respectively provided on the side wall of the insulated base and communicate with the installation groove; the base inlet and base outlet are respectively connected to a constant temperature water supply device; and a test area communicating with the water tank is provided on the insulated top cover; The water tank includes an outer box installed in the mounting groove and connected to the water outlet of the base, an inner box installed in the outer box and provided with a water storage cavity, and a platform set on the top surface of the inner box and corresponding to the test area. An inner tank water inlet communicating with the base water inlet is provided on the inner side wall of the inner tank; an outer tank water outlet communicating with the base water outlet is provided on the inner side wall of the outer tank; the top of the water storage cavity has an opening, and the top surface of the inner tank is located above the outer tank. Multiple sets of thermocouples for temperature testing are set up in the test area, and the thermocouples are connected to an external testing instrument.

2. The multi-station condensation testing device according to claim 1, characterized in that, The constant temperature and humidity measuring chamber is provided with a device door for opening and closing the installation cavity, and a platform is provided at the bottom of the installation cavity; the constant temperature water tank is installed on the platform; the constant temperature and humidity measuring chamber is provided with a drain outlet communicating with the inside of the installation cavity and a moisture inlet communicating with a humidifier; A fan assembly is provided inside the mounting cavity to enable airflow within the mounting cavity.

3. The multi-station condensation testing device according to claim 1, characterized in that, The heat-insulating base and heat-insulating top cover are made of mullite or foam material; when mullite is used to make the heat-insulating base and heat-insulating top cover, a waterproof layer is coated on the surface of the heat-insulating base and heat-insulating top cover.

4. The multi-station condensation testing device according to claim 1, characterized in that, The gap between the test area and the sample is filled with heat-insulating asbestos fiber, heat-insulating foam, or drip-impregnated heat-insulating adhesive; the test area consists of multiple groups.

5. A method for testing condensation at multiple positions in a generator set, characterized in that, The multi-station condensation testing device for generator sets according to any one of claims 1-4 specifically includes the following steps: Step S1: Install a set of thermocouples at the interface between the metal of the sample coated with the anti-corrosion and anti-condensation paint underlayer and the heat insulation and anti-condensation top layer. Step S2: Assemble the constant temperature water tank, install and fix a set of thermocouples on the heat insulation and anti-condensation coating, and install and fix a set of thermocouples on the underside of the sample. Step S3: Install the constant temperature water tank in the installation cavity, connect the thermocouple to the tester, connect the constant temperature water tank to the constant temperature water supply equipment, and connect the humidifier to the constant temperature and humidity measuring chamber. Step S4: The test is conducted using a constant temperature and humidity measuring chamber, a constant temperature water supply device, a humidifier, and a testing instrument. During the test, the humidifier inputs water mist into the constant temperature and humidity measuring chamber to provide the humidity conditions for the condensation test. The constant temperature water supply device supplies water into the water tank so that the water surface contacts the bottom of the sample.

6. The multi-station condensation test method for generator sets according to claim 5, characterized in that, Specifically, step S4 refers to: setting the temperature of the constant temperature and humidity measuring chamber and the relative humidity to 70%~75% through the control unit; and conducting a condensation test after the constant temperature water supply equipment returns water and the temperature of the constant temperature and humidity measuring chamber reaches 18°C. During testing, temperature and humidity sensors detect the ambient temperature and humidity inside the constant temperature and humidity measurement chamber and transmit the data to the control unit. The control unit analyzes and processes the data and adjusts the humidity and temperature. Multiple thermocouples are used to detect the temperature of the heat insulation and anti-condensation coating interface, surface temperature, and water tank temperature.

7. The method for multi-station condensation testing of generator sets according to claim 5, characterized in that, During testing, when the temperature and humidity sensor detects that the actual temperature is lower than the set temperature, the control unit activates the heating module to heat the actual temperature and adjust it to the set temperature. When the actual temperature is higher than the set temperature, the control unit starts the cooling module to cool down and adjust the actual temperature to the set temperature. When the actual humidity is lower than the set humidity, the control unit starts the humidifier to humidify and adjust the actual humidity to the set humidity. When the actual humidity is higher than the set humidity, the control unit starts the cooling module to cool down and adjust the actual humidity to the set humidity. Under the action of the cooling module, water mist condenses into water and is discharged through the drain. The test ends when the constant temperature and humidity measuring chamber has run for the set time.

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