Thermal shock tester cold air system

Abstract

The application discloses a thermal shock tester cold air system, which comprises a cold air outlet pipe for outputting cold air to a blade, and the thermal shock tester cold air system comprises: at least two groups of cold air pipes, each group of cold air pipes comprising a gas source and an electric heater arranged in sequence; a first pipe valve and a second pipe valve, wherein the gas outlet end of one group of cold air pipes is communicated to the cold air outlet pipe through the first pipe valve, and the gas outlet end of the other group of cold air pipes is communicated to the cold air outlet pipe through the second pipe valve; and a control module, which is electrically connected to the first pipe valve and the second pipe valve and can control the opening and closing states of the first pipe valve and the second pipe valve respectively. The thermal shock tester cold air system can keep the electric heaters in each group of cold air pipes at a specific temperature heating state, respectively provide cold air of different temperatures, achieve the purpose of quickly outputting cold air of different temperatures to the cold air outlet pipe, and effectively improve the reliability of the test results of the thermal shock test.

Description

TECHNICAL FIELD

[0001] The present application relates to a cold air system of a thermal shock tester. BACKGROUND

[0002] The turbine blade thermal shock test mainly examines the fatigue characteristics of the test blade under the cold and hot shock conditions. The temperature of the test blade periodically changes during the test to simulate the start and stop state of the engine. One cycle mainly includes a rapid heating stage, a high temperature maintaining stage, a rapid cooling stage and a low temperature maintaining stage.

[0003] The thermal shock tester provides high-temperature combustion gas to the external flow passage of the test blade through a main gas system, and provides cooling air to the inner cavity of the test blade through a cold air system. (Note: the cooling air refers to air with a temperature lower than the surface temperature of the blade. Since the average temperature of the turbine blade surface is generally higher than 800℃, the temperature of the above-mentioned cooling air is also much higher than that of normal temperature air.) The thermal shock test realizes the periodic change of the temperature of the test blade by periodically changing the parameters of the combustion gas and the cooling air. The thermal shock test requires that the combustion gas and the cooling air provided by the tester can change rapidly, and the switching time between the low parameters and the high parameters is about 10s. The cold air system of the thermal shock tester in the prior art, as shown in Figure 1 , generally includes a compressor 1', a switch 2', a first regulating valve 3', a second regulating valve 4', a flow meter 5', an electric heater 6', a pressure sensor 7' and a temperature sensor 8'. Since the electric heater 6' has large thermal inertia and is not allowed to frequently switch the power, it is not conducive to the rapid switching of the high and low parameters of the cooling air output to the blade. Therefore, during the thermal shock test, the cooling air parameters are usually kept unchanged, or no cooling air is supplied during the entire test process. The above two methods both result in a decrease in the reliability of the test results. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the low reliability of the test results of the thermal shock test on the blade in the prior art, and to provide a cold air system of a thermal shock tester.

[0005] The present application solves the above technical problem by the following technical scheme:

[0006] A cold air system of a thermal shock tester, which includes a cold air outlet pipe for outputting cooling air to a blade, the cold air system of the thermal shock tester comprising:

[0007] At least two groups of cold air pipelines, each group of the cold air pipelines comprising a gas source and an electric heater arranged in sequence;

[0008] A first pipeline valve and a second pipeline valve, wherein the gas outlet end of one group of the cold air pipelines is communicated to the cold air outlet pipe through the first pipeline valve, and the gas outlet end of the other group of the cold air pipelines is communicated to the cold air outlet pipe through the second pipeline valve.

[0009] a control module electrically connected to the first pipe valve and the second pipe valve and capable of controlling the opening and closing states of the first pipe valve and the second pipe valve respectively.

[0010] The cold air system of the thermal shock tester is provided with two or more groups of cold air pipes, so that the electric heaters in each group of cold air pipes can be kept in a heating state at a specific temperature to provide cold air at different temperatures respectively. Meanwhile, the two groups of cold air pipes are connected to the cold air outlet pipe through the first pipe valve and the second pipe valve, and the opening and closing states of the pipe valves are controlled by the control module to quickly output cold air at different temperatures to the cold air outlet pipe. In this structure, each electric heater only needs to work at a specific temperature, so the problem of thermal inertia of the electric heater does not need to be considered. Meanwhile, the opening and closing states of the pipe valves are controlled by the control module to quickly switch different cold air parameters according to target values, which effectively improves the reliability of the test results of the thermal shock test.

[0011] Preferably, the cold air system of the thermal shock tester further comprises:

[0012] an exhaust tower;

[0013] a third pipe valve and a fourth pipe valve, wherein the gas outlet end of one group of the cold air pipes is further connected to the exhaust tower through the third pipe valve, and the gas outlet end of the other group of the cold air pipes is further connected to the exhaust tower through the fourth pipe valve;

[0014] The control module is further electrically connected to the third pipe valve and the fourth pipe valve and capable of controlling the opening and closing states of the third pipe valve and the fourth pipe valve respectively.

[0015] In the above structure, the cold air pipes are further connected to the exhaust tower through the pipe valves, so that when the cold air pipes do not supply cold air to the blades, the generated cold air is transported to the exhaust tower by switching the pipe valves, so that the cold air parameters of the cold air pipes remain basically stable.

[0016] Preferably, the cold air system of the thermal shock tester further comprises a resistance simulation device, which is arranged on the pipe through which the third pipe valve and / or the fourth pipe valve is connected to the exhaust tower.

[0017] In the above structure, the resistance simulation device is arranged in the pipe through which the cold air pipes are further connected to the exhaust tower, so as to adjust and control the pipe resistance of this section of pipe. By making the pipe resistance provided by the resistance simulation device close to the resistance of the cooling cavity of the test blade, the fluctuation of the cold air parameters caused by the large flow fluctuation of the cold air pipes when the flow path is switched is avoided. Therefore, this structure can effectively improve the stability of the cold air parameters.

[0018] Preferably, the cold air system of the thermal shock tester further comprises a pressure sensor, which is arranged on the pipeline through which the first pipeline valve and / or the second pipeline valve communicates with the cold air outlet pipeline.

[0019] The above structure realizes pressure detection of the output cold air, and further improves the reliability of the test.

[0020] Preferably, the cold air system of the thermal shock tester further comprises a temperature sensor, which is arranged on the pipeline through which the first pipeline valve and / or the second pipeline valve communicates with the cold air outlet pipeline.

[0021] The above structure realizes temperature detection of the output cold air, and further improves the reliability of the test.

[0022] Preferably, the cold air system of the thermal shock tester further comprises a flow sensor, which is arranged in front of the electric heater along the flow direction of the gas in each group of the cold air pipeline.

[0023] The above structure realizes real-time detection of the flow of the gas, and facilitates the electric heater to heat more efficiently.

[0024] Preferably, two groups of the cold air pipeline share the same gas source, and the outlet end of the gas source is connected to the electric heaters of the two groups of the cold air pipeline through a pipeline in parallel.

[0025] Preferably, the cold air system of the thermal shock tester further comprises a first throttle valve and a second throttle valve, the first throttle valve is arranged between the gas source and the electric heater of one group of the cold air pipeline, and the second throttle valve is arranged between the gas source and the electric heater of another group of the cold air pipeline.

[0026] The above structure realizes the purpose of adjusting the pressure of the cold air through the throttle valve.

[0027] Preferably, the cold air system of the thermal shock tester further comprises an exhaust tower.

[0028] The gas source is directly connected to the exhaust tower through a bypass pipeline, and the bypass pipeline can be closed.

[0029] The above structure realizes the purpose of emptying the branch pipeline when the bypass pipeline is opened.

[0030] Preferably, the gas source has an air compressor.

[0031] The positive progress effect of the present application is that:

[0032] The cold air system of the thermal shock tester, by setting two or more groups of cold air pipelines, the electric heater in each group of cold air pipelines can be kept in a heating state at a specific temperature to provide cold air at different temperatures respectively, and by setting the first pipeline valve and the second pipeline valve to make the two groups of cold air pipelines respectively communicate to the cold air outlet pipe, by controlling the opening and closing state of the control module, the purpose of quickly outputting cold air at different temperatures to the cold air outlet pipe is achieved. The structure setting, since each electric heater only needs to work at a specific temperature, the problem of electric heater thermal inertia does not need to be considered. At the same time, by controlling the opening and closing state of the control module, the function of quickly switching different cold air parameters according to the target value is realized, which effectively improves the reliability of the test results of the thermal shock test. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a layout schematic diagram of the cold air system of the thermal shock tester in the prior art.

[0034] Figure 2 It is a layout schematic diagram of the cold air system of the thermal shock tester in the prior art.

[0035] BRIEF DESCRIPTION OF DRAWINGS:

[0036] Cold air pipeline 100

[0037] Electric heater 1

[0038] First pipeline valve 21

[0039] Second pipeline valve 22

[0040] Third pipeline valve 31

[0041] Fourth pipeline valve 32

[0042] Resistance simulation device 4

[0043] Pressure sensor 5

[0044] Temperature sensor 6

[0045] Flow sensor 7

[0046] First throttle valve 81

[0047] Second throttle valve 82

[0048] Bypass pipeline 9

[0049] Bypass control valve 91

[0050] Air compressor 10

[0051] Switching valve 11 DETAILED DESCRIPTION

[0052] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0053] This invention provides a cooling air system for use in a thermal shock tester. The system includes a cooling air outlet pipe for supplying cooling air to the blades, thus supplying cooling air to the chamber containing the blades (Note: Cooling air refers to air with a temperature lower than the blade surface temperature; since the average surface temperature of turbine blades is generally higher than 800°C, the cooling air temperature is also much higher than that of room temperature air). Specifically, as follows... Figure 2 As shown, the air conditioning system includes two sets of air conditioning pipes 100, a first pipe valve 21, a second pipe valve 22, and a control module (not shown in the figure). Each of the two sets of air conditioning pipes 100 has an air source and an electric heater 1 arranged sequentially along the airflow direction. The airflow generated by the air source is heated by the electric heater 1 after passing through it. For one set of air conditioning pipes 100, its outlet end (i.e....) Figure 2 The right end of the electric heater 1 is connected to the cold air outlet pipe via the first pipe valve 21 to supply air to the blades, while another set of cold air pipes 100 has its outlet end connected to the cold air outlet pipe via the second pipe valve 22 to supply air to the blades. Both of these pipe valves are connected to the control module via wires. The control module drives the first pipe valve 21 and the second pipe valve 22 to open and close by sending control signals.

[0054] This air conditioning system, by setting up two sets of air conditioning pipelines 100, allows the electric heaters 1 in each set of air conditioning pipelines 100 to be maintained at specific heating temperatures to provide air conditioning at different temperatures. Simultaneously, by setting up a first pipeline valve 21 and a second pipeline valve 22, the two sets of air conditioning pipelines 100 are connected to the air conditioning outlet pipe respectively. A control module controls the opening and closing of these pipeline valves to achieve the purpose of rapidly outputting air conditioning at different temperatures to the air conditioning outlet pipe. With this structure, since each electric heater 1 only needs to operate continuously at a specific temperature, there is no need to consider the thermal inertia of the electric heater 1. At the same time, by controlling the opening and closing of the pipeline valves through the control module, the function of rapidly switching different air conditioning parameters according to target values ​​can be achieved, effectively improving the reliability of the thermal shock test results. Of course, in other embodiments, the air conditioning system can also set up two or more sets of air conditioning pipelines, which can be alternately connected to the air conditioning outlet pipe to achieve rapid switching between three or more temperature ranges.

[0055] Specifically, the first pipe valve 21 and the second pipe valve 22 can be solenoid valves. The control module alternately outputs control signals to the first pipe valve 21 and the second pipe valve 22 to control the first pipe valve 21 and the second pipe valve 22 to open and close alternately, so as to achieve the purpose of rapid switching between different air conditioning parameters (achieving a switching frequency within 10 seconds).

[0056] In addition, the cold air system further comprises an exhaust tower, a third pipeline valve 31 and a fourth pipeline valve 32. The outlet ends of one set of cold air pipelines 100 are connected to the exhaust tower through the third pipeline valve 31, and the outlet ends of the other set of cold air pipelines 100 are connected to the exhaust tower through the fourth pipeline valve 32. When the third pipeline valve 31 or the fourth pipeline valve 32 is opened, the corresponding pipeline exhaust is realized. In the embodiment, the control module is connected to the third pipeline valve 31 and the fourth pipeline valve 32 through wires, and can control the opening and closing states of the third pipeline valve 31 and the fourth pipeline valve 32, respectively.

[0057] The control module controls the third pipeline valve 31 and the fourth pipeline valve 32 to open and close alternately by alternately outputting control signals to the third pipeline valve 31 and the fourth pipeline valve 32. Through such a structure, the two sets of cold air pipelines 100 are also connected to the exhaust tower through the pipeline valves, so that when the cold air pipelines 100 do not supply cold air to the blades, the generated cold air is transported to the exhaust tower by switching the pipeline valves, so that the cold air parameters of the cold air pipelines 100 remain basically stable.

[0058] The control module controls the first pipeline valve 21, the second pipeline valve 22, the third pipeline valve 31 and the fourth pipeline valve to open and close. When one set of cold air pipelines 100 supplies cold air to the blades, the other set of cold air pipelines 100 supplies cold air to the exhaust tower, so that the cold air pipelines 100 remain stable when they do not supply cold air to the blades.

[0059] Specifically, the control scheme of the control module controlling the opening and closing of the first pipeline valve 21, the second pipeline valve, the third pipeline valve 31 and the fourth pipeline valve is shown in Table 1. By controlling the opening and closing of different pipeline valves, rapid switching between parameter 1 (cold air temperature 1) and parameter 2 (cold air temperature 2) is realized.

[0060] Table 1 Switching combination of pipeline valves under different cold air parameters

[0061] First conduit valve 21 Second conduit valve 22 Third conduit valve 31 Fourth conduit valve 32 Parameter 1 On Off Off On Parameter 2 Off On On Off

[0062] The cold air system further comprises a pressure sensor 5 and a temperature sensor 6, which are arranged on the pipeline connected to the cold air outlet pipe of the first pipeline valve 21 and the second pipeline valve 22, to realize pressure and temperature detection of the output cold air, and further improve the reliability of the test.

[0063] The cold air system further comprises resistance simulation devices 4, the number of which is two, which are arranged on the pipes connected to the exhaust tower by the third pipe valve 31 and the fourth pipe valve 32, so that the pipe resistance of the pipe section is adjusted and controlled. By making the pipe resistance provided by the resistance simulation devices 4 close to the resistance of the cooling cavity of the test blade, the cold air parameter fluctuation caused by the large flow fluctuation of the cold air pipeline when the flow path is switched is avoided. Therefore, the structure can effectively improve the stability of the cold air parameter.

[0064] In addition, the cold air system further comprises a flow sensor 7 arranged at the front end of the electric heater 1 along the flow direction in each group of cold air pipelines 100. By detecting the flow rate of the gas in real time, the electric heater 1 can heat more efficiently.

[0065] As shown in FIG. 1, Figure 2 In the embodiment, two groups of cold air pipelines 100 share the same gas source. The outlet end of the gas source is connected to the electric heaters 1 of the two groups of cold air pipelines 100 in parallel through a pipeline. By sharing the gas source, the structure of the cold air pipeline 100 is simplified. In addition, the cold air system further comprises a first throttle valve 81 and a second throttle valve 82. The first throttle valve 81 is arranged between the gas source and the electric heater 1 of one group of cold air pipelines 100, and the second throttle valve 82 is arranged between the gas source and the electric heater 1 of the other group of cold air pipelines 100. By this structure, the pressure of the cold air in the pipeline is adjusted with high precision. The gas source further comprises an air compressor 10 arranged on each group of cold air pipelines 100 one by one. By additionally arranging the air compressor 10, the flow pressure of the gas in the pipeline is improved on the basis of the gas supply of the gas source.

[0066] In addition, the gas source is directly connected to the exhaust tower through a bypass pipeline 9. The bypass control valve 91 is arranged on the bypass pipeline 9 to achieve the purpose of shutting off. When the bypass pipeline 9 is opened, the branch can be emptied.

[0067] In addition, in the embodiment, a switch valve 11 is arranged at the rear end of the gas source to achieve the opening and closing of the whole cold air system.

[0068] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example. The protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and such changes and modifications fall within the protection scope of the present application.

Claims

1. A cold air system of a thermal shock tester comprising a cold air outlet pipe for outputting cold air to a blade, characterized by, The cold air system of the thermal shock tester comprises: at least two groups of cold air pipelines, each group of the cold air pipelines comprising a gas source and an electric heater arranged in sequence, a first pipeline valve and a second pipeline valve, wherein the gas outlet of one group of the cold air pipelines is communicated to the cold air outlet pipe through the first pipeline valve, and the gas outlet of the other group of the cold air pipelines is communicated to the cold air outlet pipe through the second pipeline valve; a control module electrically connected to the first pipeline valve and the second pipeline valve and capable of controlling the opening and closing states of the first pipeline valve and the second pipeline valve respectively; an exhaust tower, the gas source being further directly communicated to the exhaust tower through a bypass pipeline, the bypass pipeline being capable of being shut off; a third pipeline valve and a fourth pipeline valve, wherein the gas outlet of one group of the cold air pipelines is further communicated to the exhaust tower through the third pipeline valve, and the gas outlet of the other group of the cold air pipelines is further communicated to the exhaust tower through the fourth pipeline valve; the control module is further electrically connected to the third pipeline valve and the fourth pipeline valve and capable of controlling the opening and closing states of the third pipeline valve and the fourth pipeline valve respectively; a resistance simulation device arranged on the pipeline through which the third pipeline valve and / or the fourth pipeline valve is communicated to the exhaust tower.

2. The cold air system of the thermal shock tester according to claim 1, wherein, The cold air system of the thermal shock tester further comprises a pressure sensor arranged on the pipeline through which the first pipeline valve and / or the second pipeline valve is communicated to the cold air outlet pipe.

3. The thermal shock tester cold gas system of claim 1, wherein, The cold air system of the thermal shock tester further comprises a temperature sensor arranged on the pipeline through which the first pipeline valve and / or the second pipeline valve is communicated to the cold air outlet pipe.

4. The thermal shock tester cold gas system of claim 1, wherein, The cold air system of the thermal shock tester further comprises a flow sensor arranged at the front end of the electric heater along the flow direction in each group of the cold air pipelines.

5. The thermal shock tester cold gas system of claim 1, wherein, The two groups of the cold air pipelines share the same gas source, and the outlet of the gas source is communicated to the electric heaters of the two groups of the cold air pipelines in parallel through a pipeline.

6. The cold air system of the thermal shock tester according to claim 5, wherein The cold air system of the thermal shock tester further comprises a first throttle valve and a second throttle valve, the first throttle valve being arranged between the gas source and the electric heater of one group of the cold air pipelines, and the second throttle valve being arranged between the gas source and the electric heater of the other group of the cold air pipelines.

7. The cold air system of the thermal shock tester according to any one of claims 1 to 6, wherein The gas source has an air compressor.

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