CN218973787U - Wind tunnel test low-temperature cool air generating device - Google Patents
Wind tunnel test low-temperature cool air generating device Download PDFInfo
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- CN218973787U CN218973787U CN202320678174.8U CN202320678174U CN218973787U CN 218973787 U CN218973787 U CN 218973787U CN 202320678174 U CN202320678174 U CN 202320678174U CN 218973787 U CN218973787 U CN 218973787U
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Abstract
The utility model provides a wind tunnel test low-temperature cool air generating device, which comprises: the device comprises an airflow pipeline, a liquid nitrogen pipeline and an electric control cabinet; the air flow pipeline is connected with an air flow inlet valve, a multi-thread shell-and-tube heat exchanger, a first temperature sensor, a pipeline heater, a second temperature sensor and an air flow outlet valve; the liquid nitrogen pipeline comprises a self-pressurizing liquid nitrogen tank, a low-temperature pressure reducing valve and a low-temperature electric proportional regulating valve, the other end of the low-temperature electric proportional regulating valve is connected with a shell-side inlet of the multi-thread shell-and-tube heat exchanger, and a shell-side outlet of the multi-thread shell-and-tube heat exchanger is connected with a nitrogen outlet one-way valve; the electric control cabinet is internally provided with a controller, a plurality of signal access ends of the controller are respectively connected with the first temperature sensor and the second temperature sensor, and a plurality of signal output ends of the controller are respectively connected with the low-temperature electric proportional control valve and the signal input end of the pipeline heater.
Description
Technical Field
The utility model belongs to the field of wind tunnel test devices, and mainly relates to a low-temperature cool air generating device for wind tunnel test.
Background
With the rapid development of the fluid industry, more and more test pieces want to simulate the test in a real environment, in wind tunnel simulation, a large low-temperature airflow simulation is often needed to be provided, and common low-temperature airflow can be realized by adopting compressor type cooling or turbine expansion type cooling, but the following problems are encountered in the above way: 1. when the compressor type refrigeration is adopted, in the process of providing low-temperature air flow, the power consumption of the compressor is very high, the energy consumption ratio of the compressor is very low, namely, more electric power is required to be consumed but less effective cooling capacity is required to be exchanged along with the reduction of the temperature of the air flow, so that the refrigeration of the compressor becomes huge in power consumption and refrigeration efficiency along with the increase of the air quantity required by the air tunnel, and the cost of compressor equipment required by cooling the high-flow air flow is huge; 2. when the turbine expander is used for refrigerating, the turbine expander can be designed according to the airflow flow and the temperature, but if the pressure of an inlet and an outlet is determined, the temperature drop amplitude is basically determined, the air source flow and the temperature cannot be adjusted in a large range in real time, and the low-temperature airflow simulation requirement cannot be met.
Disclosure of Invention
In view of the above, it is an object of the present utility model to provide a wind tunnel test cold air generating device for overcoming the above problems or at least partially solving or alleviating the above problems.
The utility model provides a wind tunnel test low-temperature cool air generating device, which comprises:
the air flow pipeline is connected with an air flow inlet valve, a multithread shell-and-tube heat exchanger, a first temperature sensor, a pipeline heater, a second temperature sensor and an outlet valve;
the liquid nitrogen pipeline comprises a self-pressurizing liquid nitrogen tank, a low-temperature pressure reducing valve and a low-temperature electric proportional regulating valve, the other end of the low-temperature electric proportional regulating valve is connected with a shell-side inlet of the multi-thread shell-and-tube heat exchanger, and a shell-side outlet of the multi-thread shell-and-tube heat exchanger is connected with a nitrogen outlet one-way valve;
and a plurality of signal input ends of the controller are respectively connected with the first temperature sensor and the second temperature sensor, and a plurality of signal output ends of the controller are respectively connected with the low-temperature electric proportional control valve and the signal input end of the pipeline heater.
The utility model also has the following optional features.
Optionally, a liquid nitrogen connecting hose, a low-temperature one-way valve, a safety pressure relief valve and a liquid nitrogen inlet low-temperature gate valve are sequentially connected between the self-pressurization liquid nitrogen tank and the low-temperature pressure relief valve.
Optionally, the self-pressurizing liquid nitrogen tank, the liquid nitrogen connecting hose and the low-temperature check valve are arranged in parallel.
Optionally, a drain valve is further connected to the pipeline between the first temperature sensor and the pipeline heater.
Optionally, the device further comprises a device base, wherein the self-pressurization liquid nitrogen tank, the low-temperature electric proportional control valve, the multi-thread shell-and-tube heat exchanger and the pipeline heater are all fixed on the device base, and casters are arranged at the lower part of the device base.
Optionally, the automatic pressurizing liquid nitrogen tank is arranged on the weighing device, and the weighing device is in signal connection with the controller.
According to the wind tunnel test low-temperature cold air generating device, a multithread shell-and-tube heat exchanger is arranged between an air flow pipeline and a liquid nitrogen pipeline, heat exchange and cooling are carried out on dry test air flow through liquid nitrogen, the air flow temperature after heat exchange and cooling is detected through a first temperature sensor, and a controller controls the opening of a low-temperature electric proportional regulating valve according to the first air flow temperature to control the flow rate of a liquid nitrogen inlet so as to realize one-time regulation of the test air flow temperature; and then the second temperature sensor at the rear end of the pipeline heater is used for detecting the air flow temperature, and the controller controls the power of the pipeline heater according to the second air flow temperature, so that the secondary adjustment of the test air flow temperature is realized, and the accurate control of the test air flow temperature is realized. In the whole cooling process, the power consumption is small, the refrigerating capacity is large, the cost of required equipment is low, and the air flow temperature is accurately controlled.
Drawings
FIG. 1 is a system diagram of a wind tunnel test low temperature cool air generating device of the present utility model;
FIG. 2 is a schematic diagram of a front view of a wind tunnel test low temperature cool air generating device according to the present utility model;
FIG. 3 is a schematic diagram of a left-hand view structure of a wind tunnel test low-temperature cool air generating device according to the present utility model;
fig. 4 is a schematic top view of the wind tunnel test low-temperature cool air generating device according to the present utility model.
In the above figures: 1. a self-pressurizing liquid nitrogen tank; 2. the liquid nitrogen is connected with a hose; 3. a safety relief valve; 4. a liquid nitrogen inlet low-temperature gate valve; 5. a low temperature pressure reducing valve; 6. a low-temperature electric proportional control valve; 7. a multi-threaded shell-and-tube heat exchanger; 8. a nitrogen outlet; 9. an equipment base; 10. casters; 11. a first temperature sensor; 12. an air flow outlet valve; 13. a pipe heater; 14. a weighing device; 15. a cool air outflow port; 16. an air flow inlet; 17. an air inlet valve; 18. an electric control cabinet; 19. a nitrogen outlet check valve; 20. a shell side inlet; 21. a shell side outlet; 22. a tube side inlet; 23. a tube side outlet; 24. a pressure gauge; 25. a low temperature check valve; 26. a blow-down valve; 27. and a second temperature sensor.
The present utility model will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
Example 1
Referring to fig. 1, 2, 3 and 4, an embodiment of the present utility model provides a wind tunnel test low temperature cool air generating device, including: a gas flow line, a liquid nitrogen line and an electrical cabinet 18; the airflow pipeline is connected with an airflow inlet valve 17, a multi-thread shell-and-tube heat exchanger 7, a first temperature sensor 11, a pipeline heater 13, a second temperature sensor 27 and an airflow outlet valve 12; the liquid nitrogen pipeline comprises a self-pressurizing liquid nitrogen tank 1, a low-temperature pressure reducing valve 5, a pressure gauge 24 and a low-temperature electric proportional regulating valve 6, the other end of the low-temperature electric proportional regulating valve 6 is connected with a shell-side inlet 20 of a multi-thread shell-and-tube heat exchanger 7, and a shell-side outlet 21 of the multi-thread shell-and-tube heat exchanger 7 is connected with a nitrogen outlet one-way valve 19; a controller is arranged in the electric control cabinet 18, a plurality of signal access ends of the controller are respectively connected with the first temperature sensor 11 and the second temperature sensor 27, and a plurality of signal output ends of the controller are respectively connected with the signal input ends of the low-temperature electric proportional control valve 6 and the pipeline heater 13.
The front side of a tube side inlet 22 of the multi-thread shell-and-tube heat exchanger 7 is connected with an air flow inlet valve 17, the front side of the air flow inlet valve 17 is provided with a test air flow inlet 16, a tube side outlet 23 of the multi-thread shell-and-tube heat exchanger 7 is connected with an inlet of a pipeline heater 13 through a pipeline, a first temperature sensor 11 is arranged on the pipeline, a second temperature sensor 27 and an air flow outlet valve 12 are arranged on an outlet pipeline of the pipeline heater 13, and the rear side of the air flow outlet valve 12 is provided with a cold air flow outlet 15. The multi-thread shell-and-tube heat exchanger 7 and the pipeline heater 13 need to be subjected to heat preservation treatment, a liquid nitrogen outlet of the self-pressurization liquid nitrogen tank 1 is connected with the low-temperature pressure reducing valve 5 and the low-temperature electric regulating valve 6 through pipelines, an outlet pipeline of the low-temperature electric regulating valve 6 is connected with a shell-side inlet 20 of the multi-thread shell-and-tube heat exchanger 7, a nitrogen outlet one-way valve 19 is connected to a pipeline between a shell-side outlet 21 of the multi-thread shell-and-tube heat exchanger 7 and the nitrogen outlet 8, and the nitrogen outlet one-way valve 19 can prevent cold air from entering the pipeline from the nitrogen outlet 8 to cause ice blockage. All the connecting pipelines are subjected to heat preservation treatment.
The dried compressed air flow for wind tunnel test enters from an air flow inlet 16 of an air flow pipeline, enters the multi-threaded shell-and-tube heat exchanger 7 from a tube side inlet 22 of the multi-threaded shell-and-tube heat exchanger 7 for heat exchange and cooling after being regulated by an inlet of an air flow inlet valve 17, flows out of a tube side outlet 23 of the multi-threaded shell-and-tube heat exchanger 7 into the pipeline, detects temperature through a first temperature sensor 11, enters a pipeline heater 13 for temperature regulation, then detects temperature through a second temperature sensor 27, finally flows out of a cold air flow outlet 15 after being regulated by an outlet of an air flow outlet valve 12, and enters a wind tunnel.
When compressed air flow enters an air flow pipeline, a low-temperature gate valve 4 at a liquid nitrogen inlet is opened, liquid nitrogen in a self-pressurization liquid nitrogen tank 1 flows into the liquid nitrogen pipeline, after the pressure in the liquid nitrogen pipeline is regulated by a low-temperature pressure reducing valve 5, the controller realizes primary temperature control and regulation on the liquid nitrogen inlet amount through a low-temperature electric proportional regulating valve 6, and the liquid nitrogen enters a multi-thread shell-and-tube heat exchanger 7 from a shell-side inlet 20 to heat the compressed air, forms evaporated nitrogen, and is discharged to the atmosphere from a nitrogen outlet 8 through a nitrogen outlet one-way valve 19.
The multi-thread shell-and-tube heat exchanger 7 has the advantages of high structural strength, good heat exchange effect and the like in low-temperature heat exchange, and the controller adjusts the cold-side liquid nitrogen liquid inlet amount of the multi-thread shell-and-tube heat exchanger 7 by controlling the opening degree of the low-temperature electric proportional regulating valve 6, so that the liquid nitrogen heat exchange and cooling in the multi-thread shell-and-tube heat exchanger 7 are adjusted once. In order to ensure that the specified temperature is accurately reached, secondary accurate adjustment is performed through the pipeline heater 13, the controller controls the pipeline heater 13 to heat the air flow, the air flow temperature is compensated to the set temperature, a temperature difference is required to be set between the temperature reduction rate and the liquid nitrogen consumption reduction, the temperature is generally 5-30 ℃ according to different temperatures, the normal-temperature drying test air flow is finally changed into low-temperature air flow, and the temperature of an outlet of the test air flow reaches high-precision temperature control. Wherein, the controller detects the air flow temperature through the first temperature sensor 11, if detecting that the air flow temperature is too low, the controller will heat the air flow through the pipeline heater 13, and detect the heated air flow temperature through the second temperature sensor 27, thereby realizing heating control and ensuring the air flow temperature to be accurate.
Example 2
Referring to fig. 1, on the basis of example 1, a liquid nitrogen connection hose 2, a low-temperature check valve 25, a safety relief valve 3, and a liquid nitrogen inlet low-temperature gate valve 4 are connected in this order between a self-pressurizing liquid nitrogen tank 1 and a low-temperature relief valve 5.
The self-pressurizing liquid nitrogen tank 1, the liquid nitrogen connecting hose 2, the low-temperature one-way valve 25, the safety pressure relief valve 3 and the liquid nitrogen inlet low-temperature gate valve 4 form a liquid nitrogen source assembly.
Example 3
Referring to fig. 1 and 4, on the basis of example 2, a self-pressurizing liquid nitrogen tank 1, a liquid nitrogen connecting hose 2, and a low-temperature check valve 25 are arranged in two sets in parallel.
Two groups of self-pressurizing liquid nitrogen tanks 1 are arranged, so that the multi-thread shell-and-tube heat exchanger 7 can be cooled simultaneously, and the refrigerating capacity of liquid nitrogen and the refrigerating time of the whole system are increased.
Example 4
Referring to fig. 1, on the basis of embodiment 1, a drain valve 26 is further connected to the piping between the first temperature sensor 11 and the pipe heater 13.
The drain valve 26 can periodically drain impurities and condensed water remaining in the airflow line.
Example 5
Referring to fig. 1, 2 and 3, on the basis of embodiment 1, the device further comprises a device base 9, wherein the self-pressurizing liquid nitrogen tank 1, the low-temperature electric proportional control valve 6, the multi-thread shell-and-tube heat exchanger 7, the pipeline heater 13 and the electric control cabinet 18 are all fixed on the device base 9, and the lower part of the device base 9 is provided with a caster 10.
The self-pressurization liquid nitrogen tank 1, the low-temperature electric proportional control valve 6, the multithread shell-and-tube heat exchanger 7, the pipeline heater 13 and the electric control cabinet 18 are all fixed on the equipment base 9 to realize modularization, so that the self-pressurization liquid nitrogen tank is convenient to use, and the caster 10 is arranged at the lower part of the equipment base 9 to conveniently move the whole device.
Example 6
Referring to fig. 2, on the basis of embodiment 5, the device further comprises a weighing device 14, wherein the weighing device 14 is arranged on the device base 9, the self-pressurizing liquid nitrogen tank 1 is placed on the weighing device 14, and the weighing device 14 is in signal connection with the controller.
The controller can detect the weight change of the self-pressurization liquid nitrogen tank 1 through the weighing device 14 so as to judge the residual quantity of liquid nitrogen in the self-pressurization liquid nitrogen tank 1, and when the detected residual quantity of liquid nitrogen is less than the lower limit value, the system can give an alarm.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims. The components and structures not specifically described in this embodiment are well known in the art and are not described in detail herein.
Claims (6)
1. A wind tunnel test low temperature cool air generating device, comprising:
the air flow pipeline is connected with an air flow inlet valve (17), a multi-thread shell-and-tube heat exchanger (7), a first temperature sensor (11), a pipeline heater (13), a second temperature sensor (27) and an air flow outlet valve (12);
the liquid nitrogen pipeline comprises a self-pressurizing liquid nitrogen tank (1), a low-temperature pressure reducing valve (5) and a low-temperature electric proportional regulating valve (6), wherein the other end of the low-temperature electric proportional regulating valve (6) is connected with a shell side inlet (20) of the multi-thread shell-and-tube heat exchanger (7), and a shell side outlet (21) of the multi-thread shell-and-tube heat exchanger (7) is connected with a nitrogen outlet one-way valve (19);
the electric control cabinet (18), be provided with the controller in the electric control cabinet (18), a plurality of signal access ends of controller respectively with first temperature sensor (11) and second temperature sensor (27) are connected, a plurality of signal output ends of controller respectively with low temperature electronic proportion control valve (6) with the signal input part of pipeline heater (13).
2. The wind tunnel test low-temperature cold air generating device according to claim 1, wherein a liquid nitrogen connecting hose (2), a low-temperature one-way valve (25), a safety pressure relief valve (3) and a liquid nitrogen inlet low-temperature gate valve (4) are sequentially connected between the self-pressurization liquid nitrogen tank (1) and the low-temperature pressure relief valve (5).
3. The wind tunnel test low-temperature cold air generating device according to claim 2, wherein the self-pressurization liquid nitrogen tank (1), the liquid nitrogen connecting hose (2) and the low-temperature one-way valve (25) are arranged in two groups in parallel.
4. Wind tunnel test low-temperature cold air generating device according to claim 1, characterized in that a blow-down valve (26) is also connected to the pipeline between the first temperature sensor (11) and the pipeline heater (13).
5. The wind tunnel test low-temperature cold air generating device according to claim 1, further comprising an equipment base (9), wherein the self-pressurization liquid nitrogen tank (1), the low-temperature electric proportional control valve (6), the multi-thread shell-and-tube heat exchanger (7), the pipeline heater (13) and the electric control cabinet (18) are all fixed on the equipment base (9), and a caster (10) is arranged at the lower part of the equipment base (9).
6. The wind tunnel test low-temperature cold air generating device according to claim 5, further comprising a weighing device (14), wherein the weighing device (14) is arranged on the equipment base (9), the self-pressurizing liquid nitrogen tank (1) is placed on the weighing device (14), and the weighing device (14) is in signal connection with the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320678174.8U CN218973787U (en) | 2023-03-31 | 2023-03-31 | Wind tunnel test low-temperature cool air generating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320678174.8U CN218973787U (en) | 2023-03-31 | 2023-03-31 | Wind tunnel test low-temperature cool air generating device |
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| Publication Number | Publication Date |
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| CN218973787U true CN218973787U (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320678174.8U Active CN218973787U (en) | 2023-03-31 | 2023-03-31 | Wind tunnel test low-temperature cool air generating device |
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| CN (1) | CN218973787U (en) |
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- 2023-03-31 CN CN202320678174.8U patent/CN218973787U/en active Active
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