CN216678292U - System for simulating environment of high-temperature and low-temperature air in multi-temperature area of environmental chamber - Google Patents
System for simulating environment of high-temperature and low-temperature air in multi-temperature area of environmental chamber Download PDFInfo
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- CN216678292U CN216678292U CN202123217142.8U CN202123217142U CN216678292U CN 216678292 U CN216678292 U CN 216678292U CN 202123217142 U CN202123217142 U CN 202123217142U CN 216678292 U CN216678292 U CN 216678292U
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Abstract
The utility model discloses a system for simulating a multi-temperature-zone high-temperature and low-temperature air environment of an environmental chamber. The air treatment device comprises a low-temperature fan, a liquid nitrogen cooler and an electric heater which are sequentially connected in series according to the airflow direction, the liquid nitrogen supply device is used for conveying liquid nitrogen to the liquid nitrogen cooler, the liquid nitrogen cooler is used for cooling air flowing through in a mode of liquid nitrogen evaporation heat absorption and indirect heat exchange, and the electric heater is used for heating the air flowing through. The system for simulating the high-low temperature air environment of the multi-temperature area of the environment chamber can realize the high-low temperature environment simulation of the deep cooling temperature area, the normal cooling temperature area, the air conditioning temperature area and the high-temperature area within the temperature range of-170 ℃ to 100 ℃, has the advantages of good low-temperature simulation performance, wide simulation temperature range, reliable work, small machine room area, less investment and the like, and has wide application prospect in the field of high-low temperature environment simulation.
Description
Technical Field
The utility model relates to the technical field of climate environment simulation, in particular to a system for simulating a multi-temperature-zone high-low temperature air environment of an environmental chamber.
Background
The low-temperature environment can have adverse effects on the performance and the working reliability of industrial products such as aerospace, aviation, weapons, vehicles, electronic instruments and the like, and the low-temperature environment test is an important basic environment test project which must be carried out in the development and factory inspection processes of various industrial products, wherein the working environment of the aerospace products is the space environment, the environmental temperature is very low, so the requirement on the low-temperature environment test is high, a cryogenic low-temperature environment test needs to be carried out, and even the test temperature is required to be reduced to below-160 ℃.
The low-temperature environment test room is a test room which manually simulates the required low-temperature environment indoors and performs the low-temperature environment test of industrial products, and under the condition that personnel are required to enter the test room in the low-temperature test process, the indoor gas of the low-temperature environment test room is usually required to be air for safety.
The cascade type vapor compressor refrigeration scheme is a large-scale low-temperature environment laboratory refrigeration scheme which can ensure that indoor air is air, but the refrigeration temperature can only reach minus 80 ℃, and the low-temperature environment below minus 160 ℃ cannot be simulated, so the application range is narrow;
another refrigeration scheme that adopts at present is that liquid nitrogen gasification is low temperature nitrogen gas earlier, then directly send into indoor with low temperature nitrogen gas, replace the cooling to the room air, can make the indoor temperature reach below-160 ℃, this kind of scheme is though low temperature refrigerating system is fairly simple, but can lead to the environment of laboratory to be nitrogen gas, and personnel can't get into indoor the measuring in the test process, has the security problem, in addition, a large amount of cold and hot offsets in the liquid nitrogen gasification, and the energy consumption is high, and the working costs is high.
Therefore, when the indoor gas environment is air, how to simulate the low-temperature environment below-160 ℃ is a technical problem which needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a system for simulating a multi-temperature-zone high-low temperature air environment of an environmental chamber, which can simulate a low-temperature environment below-160 ℃.
In order to achieve the above object, the system for simulating the environment of the multi-temperature-zone high-low temperature air in the environmental chamber disclosed by the utility model comprises an air treatment device, a liquid nitrogen supply device and a return air supply pipeline, wherein:
the air return pipeline comprises an air supply pipeline and an air return pipeline, and the air return pipeline is provided with an air return valve;
the air treatment device comprises a low-temperature fan, a liquid nitrogen cooler and an electric heater which are sequentially connected in series according to the airflow direction, the air inlet end of the air treatment device is connected with the air return inlet of the environmental chamber through the air return pipeline, and the air outlet end is connected with an air supply outlet of the environment chamber through the air supply pipeline, the liquid nitrogen cooler is used for cooling the air flowing through the air treatment device in a liquid nitrogen evaporation heat absorption and indirect heat exchange mode, the electric heater is used for heating the air flowing through the air treatment device, the low-temperature fan is used for pumping the air in the environmental chamber to the air treatment device, the air is sequentially sent to the liquid nitrogen cooler and the electric heater for cooling or heating treatment, and the air subjected to cooling or heating treatment is sent to an environmental chamber so as to realize the circulating flow of the air and the cooling or heating of the indoor air;
the liquid nitrogen supply device is used for conveying liquid nitrogen to the liquid nitrogen cooler.
Optionally, in the above system for simulating a multi-temperature-zone high-low temperature air environment in an environmental chamber, the driving motor of the low-temperature fan is disposed outside the box of the air treatment device, the rotating shaft of the low-temperature fan is an extension shaft, the extension shaft penetrates out of the box of the air treatment device, and the outer side of the box of the extension shaft is connected with the driving motor in a direct connection manner or a belt pulley connection manner.
Optionally, in the above-mentioned system for simulation of environment room multi-temperature-zone high-low temperature air environment, still include dehydrating unit, dehydrating unit installs in the dehumidification blast pipe, is used for getting into the air before the air treatment device dehumidifies, the dehumidification blast pipe establish ties behind the circulation dehumidification return air duct constitute with the parallelly connected pipeline of return air duct, circulation dehumidification return air duct is provided with the circulation dehumidification valve, the dehumidification blast pipe with the junction of circulation dehumidification return air duct is provided with the new trend entry.
Optionally, in the system for simulating a multi-temperature-zone high-low temperature air environment in an environmental chamber, the dehumidifying device adopts a two-stage serial dehumidification scheme of direct evaporative cooling dehumidification and adsorption dehumidification, and includes a fan, a cold dryer, a water separator and an adsorption dehumidifier which are sequentially connected in series according to an airflow direction.
Optionally, in the above system for simulating a multi-temperature-zone high-low temperature air environment in an environmental chamber, the measurement and control device includes:
the indoor temperature sensor, the indoor dew point sensor and the indoor positive pressure sensor are arranged in the environmental chamber and are respectively used for detecting the temperature, the air dew point temperature and the indoor pressure in the environmental chamber;
the indoor air supply temperature sensor is arranged at the air outlet end of the air processing device and is used for monitoring the temperature of the air processed by the air processing device;
the fresh air supply temperature sensor and the fresh air supply dew point sensor are arranged at the air outlet end of the dehumidifying device and are respectively used for monitoring the air temperature and the dew point temperature of the air outlet end of the dehumidifying device.
Optionally, in the system for simulating a multi-temperature-zone high-low temperature air environment in an environmental chamber, the fan of the dehumidification device is a variable frequency fan, and the measurement and control device controls the operating frequency of the variable frequency fan according to the positive pressure change in the environmental chamber, so that the positive pressure in the environmental chamber is maintained within a preset range.
Optionally, in the system for simulating a multi-temperature-zone high-low temperature air environment in an environmental chamber, the liquid nitrogen supply device includes a liquid nitrogen tank and a vaporizer connected to a bottom of the liquid nitrogen tank, a liquid outlet of the liquid nitrogen tank is connected to the liquid nitrogen cooler through a liquid nitrogen supply pipe, and the vaporizer is configured to take liquid nitrogen from the liquid nitrogen tank and discharge nitrogen gas generated by vaporizing the liquid nitrogen into the liquid nitrogen tank, so that a pressure sufficient for extruding the liquid nitrogen from the liquid outlet and delivering the liquid nitrogen to the liquid nitrogen cooler is generated in the liquid nitrogen tank.
Alternatively, in the system for simulating a multi-temperature-zone high-and-low-temperature air environment in an environmental chamber, the tank body of the liquid nitrogen tank has a vacuum multi-layer heat insulation structure or a vacuum powder heat insulation structure, and the liquid nitrogen supply pipe has a stainless steel vacuum multi-layer heat insulation pipe or a stainless steel pipe insulated with a low-temperature foam heat insulation material.
Optionally, in the system for simulating a multi-temperature-zone high-low temperature air environment in an environmental chamber, a safety exhaust pipe is connected to the top of the liquid nitrogen tank, a safety valve is disposed on the safety exhaust pipe, and when the pressure in the liquid nitrogen tank is greater than a threshold of the safety valve, nitrogen in the liquid nitrogen tank is exhausted from the safety exhaust pipe.
According to the technical scheme, in the system for simulating the environment of the multi-temperature-zone high-temperature and low-temperature air in the environment chamber, the liquid nitrogen supply device provides liquid nitrogen for the liquid nitrogen cooler of the air treatment device, the liquid nitrogen cooler cools the air flowing through the air treatment device in a liquid nitrogen evaporation heat absorption and indirect heat exchange mode, and the cooled air flows into the environment chamber along the air supply pipeline of the air return pipeline, so that the aim of cooling the air in the environment chamber is fulfilled; under normal pressure, the evaporation temperature of liquid nitrogen is-196 ℃, and the evaporation heat absorption process can cool the air flowing through the air treatment device to an ultralow temperature environment below-160 ℃ (the lowest temperature can reach-170 ℃); meanwhile, the indirect heat exchange ensures that nitrogen formed by the evaporation of the liquid nitrogen in the liquid nitrogen cooler cannot be mixed into the circulating air of the environment chamber, and the safety of the environment chamber testers is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow diagram of a system for simulating a multi-temperature-zone high-temperature and low-temperature air environment in an environmental chamber according to an embodiment of the present invention.
The system comprises an air treatment device 1, an air filter 11, a low-temperature fan 12, a first maintenance section 13, a liquid nitrogen cooler 14, a second maintenance section 15, an electric heater 16, an air outlet end 17, an access door 18, a driving motor 121, a fan rotating shaft 122 and a fan body 123, wherein the air treatment device is characterized in that the air treatment device is an air treatment device, the air filter 11 is an air filter, the low-temperature fan 12 is a low-temperature fan, the first maintenance section 13 is a first maintenance section, the liquid nitrogen cooler 14 is a liquid nitrogen cooler, the second maintenance section 15 is a second maintenance section, the electric heater 16 is an electric heater, the air outlet end 17 is an air outlet end, the access door 18 is an access door;
2, a dehumidifying device, a fan 21, a cooling and drying machine 22, a water separator 23, an adsorption dehumidifier 24, a dehumidifying blast pipe 25, a fresh air inlet 26 and a circulating dehumidifying return air pipeline 27 are arranged;
3 is a liquid nitrogen supply device, 31 is a liquid inlet valve, 32 is a liquid inlet pipe, 33 is a liquid nitrogen tank, 34 is a gasifier, 35 is a liquid nitrogen supply pipe, 36 is a liquid supply valve, 37 is a nitrogen gas discharge pipe, 38 is a safety exhaust pipe, and 39 is a safety valve;
4 is an air supply pipeline, 41 is an air supply pipe section, and 42 is an air supply outlet;
5 is a return air pipeline, 51 is a first return air pipe section, 52 is a second return air pipe section, 53 is a third return air pipe section, and 54 is a return air inlet;
6 is a measuring and controlling device, 601 is a control cabinet, 602 is an indoor temperature sensor, 603 is an indoor dew point sensor, 604 is an indoor positive pressure sensor, 605 is an indoor air supply temperature sensor, 606 is a fresh air supply temperature sensor, 607 is a fresh air supply dew point sensor, 608 is a liquid nitrogen tank pressure sensor, 609 is a gasifier liquid inlet valve, 610 is a liquid nitrogen flow regulating valve, 611 is a fresh air valve, 612 is a circulating dehumidification valve, and 613 is an air return valve.
Detailed Description
The core of the utility model is to provide a system for simulating the multi-temperature-zone high-low temperature air environment of an environmental chamber, which can realize the simulation of the multi-temperature-zone high-low temperature air environment of-170 ℃ to 100 ℃.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention are described below clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Firstly, the system for simulating the multi-temperature-zone high-temperature and low-temperature air environment of the environmental chamber disclosed by the utility model is described, please refer to fig. 1, in this embodiment, the system comprises an air processing device 1, a dehumidifying device 2, a liquid nitrogen supply device 3 and a return air pipeline, wherein the return air pipeline comprises an air supply pipeline 4 and an air return pipeline 5, the dehumidifying device 2 is installed on a dehumidifying air supply pipe 25, the dehumidifying air supply pipe 25 is connected in series with a circulating dehumidifying air return pipeline 27 to form a pipeline connected in parallel with the air return pipeline 5, the air processing device 1 comprises a low-temperature fan 12, a liquid nitrogen cooler 14 and an electric heater 16 which are sequentially connected in series according to the air flow direction, the air inlet end of the air processing device 1 is connected with an air return port 54 of the environmental chamber through the air return pipeline 5, and the air outlet end 17 is connected with an air supply port 42 of the environmental chamber through the air supply pipeline 4.
The joint of the dehumidification blast pipe 25 and the circulation dehumidification return air pipeline 27 is provided with a fresh air inlet 26, namely the fresh air inlet 26 is arranged on one side of the inlet of the dehumidification device 2, the dehumidification device 2 can deeply dehumidify the air before entering the air treatment device 1, and the liquid nitrogen supply device 3 can convey liquid nitrogen to the liquid nitrogen cooler 14.
The second return air pipe section 52 of the return air pipe 5 is provided with a return air valve 613, the circulating dehumidification return air pipe 27 is provided with a circulating dehumidification valve 612, the fresh air inlet 26 is provided with a fresh air valve 611, and the system can be selectively set to be a closed circulating dehumidification working condition or an open fresh air dehumidification and positive pressure air supply working condition by controlling the opening and closing of the return air valve 613, the circulating dehumidification valve 612 and the fresh air valve 611. Specifically, the circulation dehumidification valve 612 is opened, the return air valve 613 and the fresh air valve 611 are closed, and the system performs a closed circulation dehumidification working condition; the circulation dehumidification valve 612 is closed, the fresh air valve 611 and the return air valve 613 are opened, outdoor air is introduced into the system through the fresh air inlet 26, and the system performs open fresh air dehumidification and positive pressure air supply working conditions to maintain a certain positive pressure in the room.
The liquid nitrogen cooler 14 is connected with the liquid nitrogen supply device 3, and can cool the air flowing through the air processing device 1 in a liquid nitrogen evaporation heat absorption and indirect heat exchange mode, and the low-temperature fan 12 can pump the air in the environmental chamber to the air processing device 1 and sequentially send the air to the liquid nitrogen cooler 14 and the electric heater 16, so that the air circulation flow in the air processing device 1 and the air in the environmental chamber is realized.
As shown by the arrows in fig. 1, the air in the environmental chamber flows out from the air return opening 54 into the first air return duct section 51, then enters the third air return duct section 53 through the second air return duct section 52 (or the circulating dehumidification air return duct 27 and the dehumidification device 2), then enters the air treatment device 1, passes through the air supply duct section 41 after the temperature rise or decrease in the air treatment device 1 is completed, and finally flows back into the environmental chamber from the air supply opening 42, so as to achieve the temperature rise or decrease in the air in the environmental chamber.
The liquid nitrogen cooler 14 cools the air flowing through the air treatment device 1 in a liquid nitrogen evaporation heat absorption and indirect heat exchange mode, the evaporation temperature of the liquid nitrogen is-196 ℃ under normal pressure, the evaporation heat absorption process of the liquid nitrogen can cool the air flowing through the air treatment device 1 to be below-180 ℃, and therefore the low-temperature or even ultralow-temperature environment for low-temperature tests of products can be simulated. The indirect heat exchange means that the liquid nitrogen and the nitrogen channel of the liquid nitrogen cooler 14 are independent from the air channel, so that the nitrogen formed by evaporation of the liquid nitrogen in the liquid nitrogen cooler 14 is prevented from being mixed into the circulating air of the environmental chamber, and important conditions are provided for ensuring the safety of environmental laboratory testers.
The high-temperature and low-temperature environmental simulation in the present invention means an environmental simulation at a temperature of-170 to 100 ℃.
The pipes through which the air circulates may be made of stainless steel material and insulated, one or more air supply ports 42 and one or more air return ports 54 may be provided to the environmental chamber. The liquid nitrogen cooler 14 usually adopts a tube-fin structure, liquid nitrogen flows in a tube, air flows outside the tube, the liquid nitrogen cooler 14 can be manufactured by adopting copper tube aluminum fins, and the aluminum fins are fixed on the copper tubes through a brazing process so as to avoid the problem that the heat exchange is influenced because the aluminum fins are loosened due to expansion with heat and contraction with cold under the condition of large temperature change in the conventional tube expansion process.
In this embodiment, the air processing device 1 further includes an air filter 11, as shown in fig. 1, the air filter 11 is preferably disposed near the air inlet end and located upstream of the liquid nitrogen cooler 14 to filter impurities in the air entering the air processing device 1, and protect components of the air processing device 1, such as the low temperature fan 12, the liquid nitrogen cooler 14, and the electric heater 16.
The upstream and downstream in the present case are defined as follows from the return air opening 54 of the environmental chamber, and the air passes through the component a first and then the component B, which means that the component a is located upstream of the component B, or the component B is located downstream of the component a.
In the actual operation process, the overhaul of each part in the air treatment device 1 needs to be considered, therefore, it is necessary to set up overhaul sections, the number of the overhaul sections is not limited, the overhaul sections can be flexibly set according to the actual overhaul requirements, the air treatment device 1 shown in fig. 1 comprises two overhaul sections, wherein the two overhaul sections are respectively a first overhaul section 13 and a second overhaul section 15, the first overhaul section 13 and the second overhaul section 15 are respectively arranged at the upstream and the downstream of a liquid nitrogen cooler 14, each overhaul section is provided with an overhaul door 18 for people to go in and out, in addition, an overhaul door 18 is also arranged at the inlet of the air filter 11, so that the air filter 11 can be replaced, cleaned and the like.
The air treatment device 1 is made of an aluminum alloy plate or a stainless steel plate for heat insulation. In this embodiment, the low temperature fan 12 is disposed at the upstream of the liquid nitrogen cooler 14, so that the heat of the low temperature fan 12 can be prevented from affecting the cooled air, and the working temperature of the low temperature fan 12 is increased. In consideration of the adverse effect that the low-temperature air may have on the driving motor 121, the driving motor 121 in this embodiment is disposed outside the casing of the air treatment device 1, and is connected to the blower body 123 through the blower rotating shaft 122 penetrating through the casing of the air treatment device 1, and because the length of the blower rotating shaft 122 is large (i.e., the length is increased), the blower rotating shaft 122 is designed to have a structure with high rigidity. The fan body 123 is made of low-temperature-resistant stainless steel or aluminum alloy and adopts a variable-frequency-adjusting centrifugal fan, so that different requirements of different test items on air quantity are met, and running energy consumption is reduced.
With reference to fig. 1, in the present embodiment, the liquid nitrogen supply device 3 specifically includes a liquid nitrogen tank 33, a liquid nitrogen supply pipe 35, a nitrogen gas discharge pipe 37 and a vaporizer 34, the liquid nitrogen tank 33 has a liquid outlet, one end of the liquid nitrogen supply pipe 35 is connected to the liquid outlet, and the other end is connected to a liquid nitrogen inlet of the liquid nitrogen cooler 14; the nitrogen gas discharge pipe 37 is connected with the nitrogen gas outlet of the liquid nitrogen cooler 14, the gasifier 34 is connected with the liquid nitrogen tank 33, the nitrogen gas discharge pipe is used for taking liquid nitrogen from the liquid nitrogen tank 33 and discharging the gasified nitrogen gas of the liquid nitrogen into the liquid nitrogen tank 33, so that pressure enough for extruding the liquid nitrogen from the liquid outlet to the liquid nitrogen cooler 14 is generated in the liquid nitrogen tank 33, the extrusion conveying mode is adopted to replace the conventional liquid nitrogen pump conveying mode to convey the liquid nitrogen, the system is simplified, meanwhile, the working reliability of the system is improved, and the investment cost is reduced.
The vaporizer 34 is provided with a vaporizer inlet valve 609 to adjust the flow of liquid nitrogen into the vaporizer 34. The liquid nitrogen tank 33 is usually a vertical tank to increase the static pressure during liquid nitrogen transportation, the liquid nitrogen tank 33 is usually insulated in a vacuum multilayer heat insulation or vacuum powder heat insulation mode, all liquid nitrogen required by one-time low-temperature test is usually stored in the liquid nitrogen tank 33, liquid supplement is not required in the test process, and the operation is simple; certainly, in order to reduce the engineering investment, the volume of the liquid nitrogen tank 33 can also be reduced, and the liquid supplementing operation can be performed in the test process, for example, a liquid inlet pipe 32 is arranged on the liquid nitrogen tank 33 shown in fig. 1, and a liquid inlet valve 31 is arranged on the liquid inlet pipe 32, so as to achieve the liquid supplementing of the liquid nitrogen tank 33.
The nitrogen generated after the liquid nitrogen is evaporated in the liquid nitrogen cooler 14 is discharged at high altitude through the nitrogen discharge pipe 37, in order to adjust the on-off and flow of the liquid nitrogen entering the liquid nitrogen cooler 14, the liquid nitrogen supply pipe 35 is further provided with a liquid supply valve 36 and a liquid nitrogen flow adjusting valve 610, and the top of the liquid nitrogen tank 33 is further provided with a liquid nitrogen tank pressure sensor 608 so as to grasp the pressure in the liquid nitrogen tank 33 in real time; in order to ensure safety, a safety exhaust pipe 38 is further arranged at the top of the liquid nitrogen tank 33, a safety valve 39 is arranged on the safety exhaust pipe 38, and after the pressure in the liquid nitrogen tank 33 exceeds a warning value (such as 1MPa), nitrogen is automatically released from the safety valve 39 and is led to a discharge area which is pollution-free to personnel and the environment through the safety exhaust pipe 38 or is led to a nitrogen discharge pipe 37 to be discharged aloft together with nitrogen generated after liquid nitrogen in the liquid nitrogen cooler 14 is evaporated. All the liquid nitrogen and nitrogen gas pipes of the liquid nitrogen supply device 3 are insulated.
In addition to being capable of simulating a low-temperature air environment, the system for simulating a multi-temperature-zone high-low-temperature air environment of an environmental chamber disclosed by the utility model can also be used for simulating a high-temperature air environment, according to analysis on high-temperature test requirements of most products, the simulated high-temperature environment temperature range is usually not more than 100 ℃, as shown in fig. 1, the electric heater 16 is arranged at the downstream of the liquid nitrogen cooler 14, and when the low-temperature air environment is simulated, the electric heater 16 does not work, and only the liquid nitrogen cooler 14 works; in the high-temperature air environment simulation, the electric heater 16 is operated, and the liquid nitrogen cooler 14 is not operated.
As shown in fig. 1, the dehumidifier 2 can deeply dry the air to make the dew point temperature of the air reach a dew point temperature lower than-70 ℃, so as to ensure that the surface of the liquid nitrogen cooler 14 is not frosted and frozen during the low temperature test, and the liquid nitrogen cooler can work safely and efficiently.
The dehumidification device 2 at least comprises a cold dryer 22 and a water separator 23, the cold dryer 22 and the water separator 23 are sequentially arranged in the air flow direction, the cold dryer 22 is used for freezing and dehumidifying air, and the water separator 23 is used for separating liquid moisture condensed from the air after the air is cooled by the cold dryer 22; an adsorption dehumidifier 24 is connected in series downstream of the water separator 23 to deeply dehumidify the air.
The dehumidification working method of the system is divided into a closed circulation dehumidification mode and an open fresh air dehumidification mode, closed circulation dehumidification is carried out before low-temperature environment test, open fresh air dehumidification is carried out after indoor air reaches required dryness, and then low-temperature environment test can be carried out.
Closed cycle dehumidification: the fresh air valve 611 and the return air valve 613 are closed, the circulating dehumidification valve 612 is opened, so that the air in the environmental chamber enters the circulating dehumidification return air duct 27 from the return air inlet 54 and returns to the dehumidification device 2, the dehumidified dry air enters the air treatment device 1 and then is sent to the environmental chamber air supply outlet 42 through the air supply duct 4, and the dry air enters the environmental chamber through the air supply outlet 42 for dehumidification and then enters the next dehumidification cycle.
Open type fresh air dehumidification: the fresh air valve 611 and the return air valve 613 are opened, the circulating dehumidification valve 612 is closed, outdoor air at the fresh air inlet 26 is sucked by the fan 21 and then enters the dehumidification device 2 for dehumidification, the air dew point temperature at the air outlet end of the dehumidification device 2 reaches the required dryness, and the dry air is mixed with return air of the return air pipe and then is sent to the third return air pipe section 53 to enter the air treatment device 1, so that fresh air dehumidification and positive pressure air supply to the environmental chamber are realized, and a certain positive pressure is maintained in the chamber.
The cold dryer 22 can be cooled by cold water or by direct evaporation cooling, the temperature of the air passing through the cold dryer 22 is below 12 ℃, then the water separator 23 separates out the condensed liquid water, and the liquid water is further dehumidified by the adsorption dehumidifier 24. The adsorption dehumidifier 24 can adopt a low dew point rotary dehumidifier or an adsorption drying tower. The fan 21 of the dehumidifying device 2 usually adopts a high-pressure fan, the air pressure should reach 0.1MPa, and the fan is a variable-frequency fan, so that the fresh air volume can be flexibly adjusted, a certain positive pressure is ensured to be maintained in the environmental chamber, and the external moist air is prevented from entering the environmental chamber. That is to say, when the fan 21 is a variable frequency fan, the measurement and control device controls the operating frequency of the fan 21 according to the positive pressure change in the environmental chamber, so that the positive pressure in the environmental chamber is maintained within the preset range. In general, the dehumidifying apparatus 2 may not be operated when the room temperature of the ambient room is higher than 5 ℃ and there is no requirement for the indoor humidity.
The system for simulating the environment of the high-temperature and low-temperature air with multiple temperature areas in the environmental chamber disclosed by the utility model further comprises a set of measurement and control device 6, wherein the measurement and control device 6 mainly comprises a control cabinet 601 and various sensors, specifically, as shown in fig. 1, an indoor temperature sensor 602, an indoor dew point sensor 603 and an indoor positive pressure sensor 604 are arranged in the environmental chamber so as to detect the temperature, the air dew point temperature and the indoor positive pressure in the environmental chamber, and an indoor air supply temperature sensor 605 is arranged at the air outlet end of the air processing device 1 so as to monitor the temperature of the air sent into the environmental chamber; the air outlet end of the dehumidifier 2 is provided with a fresh air supply temperature sensor 606 and a fresh air supply dew point sensor 607, so as to monitor the temperature and dew point temperature of the fresh air after dehumidification processing.
The room temperature control method for low temperature test comprises the following steps: based on the data from the indoor temperature sensor 602, the control cabinet 601 adjusts the opening of the liquid supply valve 36 to control the amount of liquid nitrogen entering the liquid nitrogen cooler 14, and decreases the opening of the liquid supply valve 36 when the room temperature is lower than the set temperature, increases the opening of the liquid supply valve 36 when the room temperature is higher than the set temperature, and maintains the opening of the liquid supply valve 36 when the room temperature is within the set range.
The room temperature control method for high temperature test comprises the following steps: according to the data of the indoor temperature sensor 602, the control cabinet 601 controls the power of the electric heater 16, when the room temperature is higher than the set temperature, the power of the electric heater 16 is reduced, when the room temperature is lower than the set temperature, the power of the electric heater 16 is increased, when the room temperature is within the set temperature range, the power of the electric heater 16 is kept unchanged, and the power of the electric heater 16 can adopt a control mode of silicon controlled rectifier adjustment, or can adopt a control mode of group regulation or a control mode of combination of the two modes. It should be noted that both the thyristor control mode and the group regulation mode are mature technologies in the prior art.
The control method of the positive pressure of the environmental chamber comprises the following steps: during the low temperature test, according to the data of the indoor positive pressure sensor 604, the control cabinet 601 adjusts the operating frequency of the fan 21 in the dehumidifier 2, and when the positive pressure in the environmental chamber exceeds a set value, the operating frequency of the fan 21 is reduced, when the positive pressure in the environmental chamber is lower than the set value, the operating frequency of the fan 21 is increased, and when the positive pressure in the environmental chamber is within a set pressure range, the operating frequency of the fan 21 is kept unchanged. The positive pressure in the ambient chamber is usually controlled to 5Pa to 15 Pa.
The method for controlling the gas pressure in the liquid nitrogen tank 33 comprises the following steps: according to the data of the liquid nitrogen tank pressure sensor 608, the control cabinet 601 adjusts the opening of the gasifier liquid inlet valve 609 to adjust the gas pressure in the liquid nitrogen tank 33, and when the pressure in the liquid nitrogen tank 33 is lower than a set value, the opening of the gasifier liquid inlet valve 609 is increased; when the pressure in the liquid nitrogen tank 33 is higher than a set value, the opening degree of a liquid inlet valve 609 of the gasifier is reduced; when the pressure in the liquid nitrogen tank 33 is within a set range, the opening degree of the gasifier feed valve 609 is kept constant. The gas pressure in the liquid nitrogen tank 33 is usually controlled to 0.15MPa to 0.25 MPa.
Some control methods of the system for simulating the environment of the environment with multiple temperature zones and high and low temperatures in the environmental chamber, such as a dehumidification condition operation method, a low temperature simulation method and a high temperature simulation method, are described below.
The dehumidification working condition operation method comprises the following steps: when primary dehumidification is carried out on the environmental chamber, closed cycle dehumidification is carried out; when the indoor air of the environmental chamber reaches the required dew point temperature, the dehumidification device reduces the dew point temperature of the fresh air to below 70 ℃ below zero, and the system is switched to an open fresh air dehumidification and positive pressure air supply working condition.
The low-temperature simulation method comprises the following steps: air in the environmental chamber flows out from the air return port 54 and enters the air treatment device 1 through the air return duct 5, and the air cooled by the liquid nitrogen cooler 14 is sent to the air supply port 42 of the environmental chamber through the air supply duct 4 and is sent back to the environmental chamber, wherein liquid nitrogen flows through the liquid nitrogen cooler 14.
Further, before the liquid nitrogen cooler 14 is operated, the low temperature simulation method further includes air dehumidification, which includes: the air in the environmental chamber flows out from the air return port 54, enters the dehumidifying device 2 through the circulating dehumidifying air return pipeline 27 for dehumidification, enters the air processing device 1, is sent to the air supply port 42 through the air supply pipeline 4 for entering the environmental chamber, is dehumidified in a circulating manner in such a way, stops closed-type circulating dehumidification until the air dryness in the environmental chamber reaches a preset value, and shifts to an open type fresh air dehumidifying working condition.
In the open type fresh air dehumidification process, the low-temperature simulation method further comprises the following steps: fresh air is introduced from the outside through a fresh air inlet 26, and the fresh air dehumidified by the dehumidifying device 2 is sent to the upstream of the liquid nitrogen cooler 14, so that the dried fresh air is mixed with indoor return air and enters the air processing device 1, and the fresh air is cooled and then sent to the air supply opening 42 through the air supply pipeline 4 to enter an environment chamber, so that the purposes of open fresh air dehumidification and positive pressure air supply are realized, and indoor positive pressure is maintained.
The high-temperature simulation method comprises the following steps: the air in the environmental chamber flows out from the air return port 54 and enters the air treatment device 1 through the air return pipeline 5, and the high-temperature air heated by the electric heater 16 is sent to the air supply port 42 of the environmental chamber through the air supply pipeline 4 and then sent into the environmental chamber, so that the circulating heating temperature rise of the indoor air is realized.
Of course, the electric heater 16 is not operated during the low temperature simulation test, and the liquid nitrogen cooler 14 is not operated during the high temperature simulation test.
The system for simulating the environment of the high-low temperature air in the multi-temperature area of the environmental chamber, disclosed by the utility model, can realize the high-low temperature environment simulation of a cryogenic temperature area, a common cold temperature area, an air-conditioning temperature area and a high-temperature area within the temperature range of-170 ℃ to 100 ℃, has wide test temperature span range and wide application range, and solves some technical problems of the current cryogenic low-temperature environment simulation; meanwhile, the liquid nitrogen indirectly cools the indoor air, so that the indoor environment is always an air environment, and personnel can conveniently enter the indoor environment for detection; and the system is simple, the area of the machine room is small, and the investment cost is low.
In the present specification, the embodiments are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A system for environmental simulation of high and low temperature air in multiple temperature zones of an environmental chamber, the system comprising an air handling device, a liquid nitrogen supply device and a return air line, wherein:
the air return pipeline comprises an air supply pipeline and an air return pipeline, and the air return pipeline is provided with an air return valve;
the air treatment device comprises a low-temperature fan, a liquid nitrogen cooler and an electric heater which are sequentially connected in series according to the airflow direction, the air inlet end of the air treatment device is connected with the air return inlet of the environmental chamber through the air return pipeline, and the air outlet end is connected with an air supply outlet of the environment chamber through the air supply pipeline, the liquid nitrogen cooler is used for cooling the air flowing through the air treatment device in a liquid nitrogen evaporation heat absorption and indirect heat exchange mode, the electric heater is used for heating the air flowing through the air treatment device, the low-temperature fan is used for pumping the air in the environment room to the air treatment device, the air is sequentially sent to the liquid nitrogen cooler and the electric heater for cooling or heating treatment, and the air subjected to cooling or heating treatment is sent to an environmental chamber so as to realize the circulating flow of the air and the cooling or heating of the indoor air;
the liquid nitrogen supply device is used for conveying liquid nitrogen to the liquid nitrogen cooler.
2. The system for simulating the high-temperature and low-temperature air environment of a multi-temperature zone of an environmental chamber according to claim 1, wherein a driving motor of the low-temperature fan is arranged outside a box body of the air treatment device, a rotating shaft of the low-temperature fan is an extension shaft, the extension shaft penetrates out of the box body of the air treatment device, and the outer side of the box body of the extension shaft is connected with the driving motor in a direct connection mode or a belt pulley connection mode.
3. The system for environmental simulation of air at high and low temperatures in multiple temperature zones of an environmental chamber as set forth in claim 1, further comprising a dehumidifying device installed in a dehumidifying air supply pipe for dehumidifying air before entering the air processing device, wherein the dehumidifying air supply pipe is connected in series with a circulating dehumidifying return air duct to form a duct connected in parallel with the return air duct.
4. The system for environmental simulation of multi-temperature-zone high-and-low temperature air in environmental chamber of claim 3, wherein the dehumidifier adopts two-stage series dehumidification scheme of direct evaporative cooling dehumidification and adsorption dehumidification, comprising a fan, a cold dryer, a water separator and an adsorption dehumidifier which are connected in series in sequence according to the airflow direction.
5. The system for environmental simulation of a multi-temperature zone high and low temperature air environment of an environmental chamber of claim 3, comprising a measurement and control device, the measurement and control device comprising:
the indoor temperature sensor, the indoor dew point sensor and the indoor positive pressure sensor are arranged in the environmental chamber and are respectively used for detecting the temperature, the air dew point temperature and the indoor pressure in the environmental chamber;
the indoor air supply temperature sensor is arranged at the air outlet end of the air processing device and is used for monitoring the temperature of the air processed by the air processing device;
the fresh air supply temperature sensor and the fresh air supply dew point sensor are arranged at the air outlet end of the dehumidifying device and are respectively used for monitoring the air temperature and the dew point temperature of the air outlet end of the dehumidifying device.
6. The system for simulating the environment of the air with the high and low temperature in the multi-temperature zone of the environmental chamber according to claim 5, wherein the fan of the dehumidifying device is a variable frequency fan, and the measuring and controlling device controls the operating frequency of the variable frequency fan according to the positive pressure change in the environmental chamber, so that the positive pressure in the environmental chamber is maintained within a preset range.
7. The system for simulating the high-temperature and low-temperature air environment of a multi-temperature-zone of an environmental chamber as claimed in any one of claims 1 to 6, wherein the liquid nitrogen supply device comprises a liquid nitrogen tank and a vaporizer connected to the bottom of the liquid nitrogen tank, the liquid outlet of the liquid nitrogen tank is connected to the liquid nitrogen cooler through a liquid nitrogen supply pipe, and the vaporizer is used for taking liquid nitrogen from the liquid nitrogen tank and discharging the vaporized liquid nitrogen into the liquid nitrogen tank, so that the pressure in the liquid nitrogen tank is generated enough to extrude the liquid nitrogen from the liquid outlet and convey the liquid nitrogen to the liquid nitrogen cooler.
8. The system for simulating a multi-temperature-zone high-and-low temperature air environment in an environmental chamber according to claim 7, wherein the tank body of the liquid nitrogen tank has a vacuum multi-layer heat insulation structure or a vacuum powder heat insulation structure, and the liquid nitrogen supply pipe has a stainless steel vacuum multi-layer heat insulation pipe or a stainless steel pipe insulated by a low-temperature foam heat insulation material.
9. The system for simulating the high-temperature and low-temperature air environment of a multi-temperature zone of an environmental chamber according to claim 7, wherein a safety vent pipe is connected to the top of the liquid nitrogen tank, a safety valve is disposed on the safety vent pipe, and when the pressure in the liquid nitrogen tank is greater than a threshold value of the safety valve, nitrogen in the liquid nitrogen tank is discharged from the safety vent pipe.
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| CN202123217142.8U CN216678292U (en) | 2021-12-20 | 2021-12-20 | System for simulating environment of high-temperature and low-temperature air in multi-temperature area of environmental chamber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123217142.8U CN216678292U (en) | 2021-12-20 | 2021-12-20 | System for simulating environment of high-temperature and low-temperature air in multi-temperature area of environmental chamber |
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