CN115078770B - Extremely low wind speed calibration system - Google Patents
Extremely low wind speed calibration system Download PDFInfo
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- CN115078770B CN115078770B CN202210765601.6A CN202210765601A CN115078770B CN 115078770 B CN115078770 B CN 115078770B CN 202210765601 A CN202210765601 A CN 202210765601A CN 115078770 B CN115078770 B CN 115078770B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
- G01P21/025—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids
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Abstract
The invention discloses an extremely low wind speed calibration system, which comprises a probe, a closed chamber, a supporting rod penetrating into the closed chamber and a driving mechanism for driving the supporting rod to move in the closed chamber, wherein the probe is provided with a first air inlet and a second air inlet; the probe is connected to the supporting rod and is positioned in the closed chamber, and the supporting rod is in soft sealing connection with the closed chamber; the system also comprises a temperature regulating system, a pressure regulating system and a humidity regulating system which are respectively used for regulating the temperature, the pressure and the humidity in the closed chamber. The invention provides an extremely low wind speed calibration system, which aims to solve the problems that the prior art does not have the capability of calibrating an anemometer at a given speed, a given temperature and a given humidity and the calibration precision of extremely low wind speed is low, and realize the purpose of accurately calibrating a hot wire anemometer in an extremely low wind speed range at different specified temperatures and different humidity.
Description
Technical Field
The invention relates to the field of wind speed measurement, in particular to an extremely low wind speed calibration system.
Background
Wind speed refers to the speed of air moving relative to a certain fixed object, and has a large size and a large direction, wind speed measurement has wide requirements and application in the fields of aerospace, vehicle engineering, precision manufacturing, weather prediction and the like, and air flow can be generally divided into various flows such as low speed, subsonic speed, transonic speed, supersonic speed, hypersonic speed and the like according to the size of the flow speed, and the flow characteristics and the measurement modes of the air flow are remarkably different. Various air flow phenomena are often accompanied in daily work and life, wherein air flows with very low speeds, such as air circulation flow in a household air conditioner, circulation heat dissipation flow in a limited space in a computer, are called very low wind speed (breeze speed) flow. Very low wind speed flow is widely used in many fields such as farmland microclimate, meteorology, ecologically monitoring of atmospheric harmful emissions, aircraft manufacturing and flight, mining, high altitude equipment safety assurance construction, fine chemical industry, medicine and others, and the typical value of indoor natural air convection flow is 0.05m/s. With the development of modern technology and the continuous improvement of requirements of people on working, living environment and ecological environment, environmental problems have become the same important field, and air speed needs to be quantified, because air is one of the most common fluids, the air provides a convection medium for pollutants, and the important significance of extremely low wind speed flow is also more and more prominent.
In the fluid measurement, the hot wire anemometer has the characteristics of quick response, wide speed measurement range, high sensitivity, simple and convenient use and the like, and has become a main instrument for measuring wind speed and turbulence. For very low wind speed flows as low as 0.1m/s, accurate measurement with a hot wire anemometer remains a current difficulty. This is because, at very low speeds, the effect of natural convection is manifested, whereas the principle of hot wire is forced convection. In addition, the calibration curve of the hot wire under the condition of extremely low wind speed is obviously different from the rule at medium and high speeds, and the hot wire is specially calibrated at the moment.
Under the condition of extremely low speed, the traditional method for controlling the speed by adopting a low-speed wind tunnel and a jet wind tunnel with the aid of a pressure measuring means cannot obtain accurate speed, and cannot perform credible calibration on a hot wire. In addition, since the speed is extremely low, heat loss is also strongly affected by heat conduction from free convection and the hot wire yoke, which depends on several factors such as gravity, the overheating ratio of the hot wire, the length-diameter ratio of the hot wire, the heat conduction of the material and the hot wire surface, etc., which all aggravate the difficulty of extremely low wind speed calibration.
In the existing low wind speed calibration device, most wind tunnels cannot calibrate extremely low wind speeds of 0.1-0.5 m/s, most wind tunnels cannot perform temperature and humidity control, and the calibration precision is more than 4%, so that the existing low wind speed calibration device does not have the capability of calibrating an anemometer at a given speed, at a given temperature and at a given humidity, and the calibration precision for extremely low wind speeds is low.
Disclosure of Invention
The invention provides an extremely low wind speed calibration system, which aims to solve the problems that the prior art does not have the capability of calibrating an anemometer at a given speed, a given temperature and a given humidity and the calibration precision of extremely low wind speed is low, and realize the purpose of accurately calibrating a hot wire anemometer at different specified temperatures and humidities within an extremely low wind speed range of 0.1-0.5 m/s.
The invention is realized by the following technical scheme:
an extremely low wind speed calibration system comprises a probe, a closed chamber, a supporting rod penetrating into the closed chamber and a driving mechanism for driving the supporting rod to move in the closed chamber; the probe is connected to the supporting rod and is positioned in the closed chamber, and the supporting rod is in soft sealing connection with the closed chamber;
the system also comprises a temperature regulating system, a pressure regulating system and a humidity regulating system which are respectively used for regulating the temperature, the pressure and the humidity in the closed chamber.
Aiming at the problems that the existing low-speed calibration equipment of the anemometer does not have the capability of calibrating the anemometer at a given speed, a given temperature and humidity and the calibration precision of the extremely low wind speed is low, the invention provides an extremely low wind speed calibration system, and a probe of the system is a hot wire anemometer probe which can be understood by a person skilled in the art. The system comprises a closed chamber and a supporting rod penetrating into the closed chamber, wherein the closed chamber is in soft sealing connection with the supporting rod, so that the sealing capacity of the closed chamber is improved as much as possible, and the supporting rod is ensured to move. In order to eliminate disturbance of other objects outside the hot wire probe to the air in front, the hot wire host computer, the acquisition computer and other blunt objects are isolated from the probe movement area, so that the probe movement area forms a closed chamber, only the support rod and the probe are arranged in the closed chamber, the influence of factors such as external disturbance air flow of people, objects and the like on the static air in the probe movement space of the support rod is avoided, and the disturbance of the front surface of other objects to the static air in front (upstream) of the hot wire probe is also eliminated. The temperature regulating system and the humidity regulating system are used for controlling the temperature and the humidity in the closed chamber, so that calibration can be performed at a given speed, a given temperature and a given humidity.
The soft seal in the present application may be any flexible sealing means known in the art.
However, the inventor finds that in the research process, at the matching position of the support rod and the soft seal, the support rod needs to move, so that the soft seal material can be extruded out of the leakage hole in the movement process, and obvious phenomena of air leakage, heat leakage and moisture leakage are caused. When there is a pressure difference between the inside and the outside of the closed chamber, local air flow is induced, so that air leakage, heat leakage and humidity leakage of the closed chamber are aggravated, and even the due state of the air in the closed chamber is destroyed. Therefore, the soft sealing connection of the application needs to ensure that the air inside and outside the sealed chamber cannot generate convection at the soft sealing connection part, so the application is provided with a pressure regulating system, and when the application works, the pressure regulating system is used for equalizing the pressure inside and outside the sealed chamber, so that even if the soft sealing connection part has a leakage hole due to the movement of the support rod, the air does not flow relatively fast because the two sides do not have pressure difference, the air in the sealed chamber is ensured to be static, the temperature and humidity are ensured to be kept at a specified value, and the probe can be ensured to move at a specified speed in the static air at a given temperature and humidity to be calibrated.
The inventor carries out simulation verification on the system, and a simulation result shows that the calibration speed control precision of the system can reach 0.005mm/s (the error caused by temperature change is not included, and the system error can be corrected). Compared with the precision of which the calibration precision is generally more than 4% in the prior art, the method and the device can provide a calibration result with extremely high precision, and have remarkable significance for extremely low wind speed calibration.
Further, a slot for the support rod to pass through is formed in the surface of the closed chamber, and the slot is sealed in a soft mode by a flexible sealing material. The slot is used for providing a movement space for the support rod, the slot is sealed by the flexible sealing material, the support rod can prop the flexible sealing material in a sealing state to move, and the support rod can be automatically folded and closed by the flexible sealing material after passing through the flexible sealing material, so that the aims of allowing the support rod to move and reducing the temperature and humidity leakage to the greatest extent are fulfilled.
The flexible sealing material is preferably made of rubber plastic materials.
Further, the driving mechanism comprises a moving platform fixedly connected with the supporting rod, a rigid connecting piece fixedly connected with the moving platform and a power assembly for driving the rigid connecting piece to do linear motion; and the device also comprises a grating ruler for measuring the moving distance of the motion platform.
According to the scheme, the power component provides power to drive the rigid connecting piece to do linear motion, and the motion platform is driven to do linear motion synchronously, so that the support rod and the probe on the support rod can move at a specified speed in the closed chamber.
The moving distance of the moving platform is measured through the grating ruler, and air disturbance caused by the fact that the moving distance of the probe needs to be directly measured in the closed chamber and interference on temperature, humidity and the like are avoided.
In one or more embodiments, the device further comprises a resident chamber positioned below the closed chamber, a slot for the support rod to pass through is arranged between the resident chamber and the closed chamber, and the slot is sealed in a soft way by a flexible sealing material;
the motion platform is positioned in the residence chamber; the rigid connecting piece passes through the side wall of the residence chamber, and the rigid connecting piece is in dynamic sealing fit with the side wall of the residence chamber; the power assembly and the grating ruler are both positioned outside the parking chamber;
the temperature regulating system, the pressure regulating system and the humidity regulating system are respectively used for regulating the temperature, the pressure and the humidity in the closed chamber to be the same as those in the residence chamber.
The scheme adopts an upper and lower double-layer structure of a closed chamber and a resident chamber, a power assembly, a grating ruler and the like are arranged outside the closed chamber, and only a probe and a probe supporting rod are reserved inside the closed chamber.
According to the scheme, due to the existence of the standing room, the motion platform moves in the standing room, and the power component is not only located outside the closed room, but also located outside the standing room, so that the power component and the grating ruler are far away from each other and are obviously blocked compared with the closed room, and electromagnetic interference caused by the fact that the power component is too close to the probe can be effectively prevented. In addition, the grating ruler is positioned outside the closed chamber and the parking chamber, so that interference of the calibration environment of the required temperature and humidity on the grating ruler can be thoroughly eliminated. In addition, due to the existence of the resident chamber, the soft sealing part can not lead to the direct communication between the closed chamber and the outside, the closed chamber only has the risk of being communicated with the resident chamber, and the consistency of the temperature, the humidity, the pressure and the like of the resident chamber and the closed chamber is only ensured during working, so that the sealing performance requirement on the soft sealing is obviously reduced, and the soft sealing device has stronger operability.
In one or more embodiments, the strut passes through the bottom of the closed chamber, and the motion platform, the power assembly and the grating scale are all positioned below the closed chamber.
In the scheme, the closed chamber and the motion platform are in an up-down structure, the power assembly, the grating ruler and the like are arranged outside the closed chamber, and only the probe and the local supporting rod are reserved inside the closed chamber; because motion platform, power component, grating chi all are located the seal chamber below, therefore this application compact structure, and be favorable to reducing installation debugging work load. In addition, in the scheme, the motion platform is positioned below the closed chamber, so that the support rod can conveniently pass through the bottom of the closed chamber.
In one or more embodiments, the strut passes through the side wall of the closed chamber, and the motion platform, the power assembly and the grating ruler are all positioned on the side surface of the closed chamber; the device also comprises a guide rail positioned in the closed chamber, and the support rod is in sliding fit with the guide rail.
In this scheme, branch passes from the seal chamber side, consequently seal chamber and motion platform arrange along the horizontal direction, and branch is the cantilever state in the seal chamber this moment, so for branch provides the guide rail and supports to stop cantilever vibration problem. The scheme has the best stability effect on the supporting rod and the probe.
Further, the closed chamber also comprises an illumination system, a video monitoring system and a mixing system.
As the name suggests, the lighting system is used to provide a lighting source for the enclosed room, the video monitoring system is used to provide image monitoring, and the mixing system is used to mix the air in the enclosed room, so that the adjustment can be quickly and uniformly completed when the temperature and humidity are adjusted.
Further, the support rod comprises a thickening part, an airfoil part and a thin rod part which are sequentially distributed; the thickening portion is located outside the closed chamber, the slim rod portion is located inside the closed chamber, and the airfoil portion is located at the slot.
The proposal thickens the bottom of the supporting rod (one end connected with the moving platform) so as to increase the rigidity thereof.
The airfoil section is an airfoil section as the name suggests, and aims to reduce friction between the strut and the soft sealing material as much as possible, so that the strut can stably and smoothly move, and the part of the soft sealing material which is spread by the strut is minimized, so that the sealing capability in the movement process is improved as much as possible.
The thin rod part is used for installing a probe, and aims to reduce disturbance of the movement of the support rod to the air of the closed chamber as much as possible.
Further, the airtight chamber sequentially comprises a steel plate, a heat insulation layer and a heat conduction layer from outside to inside, and a plurality of heat exchangers are arranged on the heat conduction layer. The steel plate is used for shielding electromagnetic interference, the heat insulation layer is used for keeping the temperature in the closed chamber stable, and the heat conduction layer and the heat exchanger are used for enabling the temperature in the closed chamber to rapidly and uniformly rise and fall when the temperature is regulated and controlled.
Further, the temperature regulating system comprises a heating and refrigerating cycle machine, a constant-temperature water tank, a circulating pipeline and a temperature sensor, wherein the temperature sensor is used for monitoring the temperature of the closed chamber, and the circulating pipeline is positioned in the inner wall and/or the outer wall and/or the interlayer of the closed chamber;
the humidity regulating system comprises a humidifier, a circulating dehumidifier and a humidity sensor, wherein the humidity sensor is used for monitoring the humidity of the closed chamber;
the pressure regulating system comprises a pressure balancing pipe for balancing the pressure inside and outside the closed chamber.
Wherein, constant temperature water tank and circulation line intercommunication realize that the water bath adjusts the temperature.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the extremely low wind speed calibration system solves the problems that the prior art does not have the capability of calibrating an anemometer at a given speed, a given temperature and a given humidity and the calibration precision of the extremely low wind speed is low, can calibrate the extremely low wind speed at the given speed, the given temperature and the humidity, and can achieve the control precision of the calibration speed of 0.005mm/s, thereby filling the blank of the prior art.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of a connection according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention;
FIG. 3 is a schematic diagram of an embodiment of the present invention;
FIG. 4 is a schematic diagram of an embodiment of the present invention;
FIG. 5 is a schematic view of a strut according to an embodiment of the present invention;
fig. 6 is a schematic view of a soft seal structure according to an embodiment of the present invention.
In the drawings, the reference numerals and corresponding part names:
1-a servo motor driver; 2-grating ruler driver; 3-a motion controller; 4-a main control computer; 5-a console; 6-a hard disk video recorder; 7-monitor display; 8-a main control computer display; 9-an air mixing fan; 10-a high-temperature camera; 11-a synchronous belt supporting wheel; 12-grating ruler; 13-grating ruler reading head; 14-a closed chamber; 15-LED lamps; 16-a pressure equalization tube; 17-a temperature control system; 18, a temperature and humidity control cabinet; 19-a humidity control system; 20-a pressure regulating valve; 21-a valve controller; 22-differential pressure transmitter; a 23-temperature transmitter; 24-probe; 25-humidity transmitter; 26-hot wire anemometer host; 27-a notebook computer; 28-driven synchronizing wheel; 29-ball slides; 30-ball guide rail; 31-a motion platform; 32-a synchronous belt; 33-an active synchronizing wheel; 34-reducer; 35-a servo motor; 36-a first limit switch; 37-a second limit switch; 38-barometer; 39-an atmospheric temperature transmitter; 40-atmosphere humidity transmitter, 41-supporting rod, 411-thickening part, 412-airfoil part, 413-thin rod part, 42-rigid connecting piece, 43-resident room, 44-soft seal, 45-shell, 46-tensioning wheel, 47-gear, 48-rack and 49-rubber plastic plate.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention. In the description of the present application, it should be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present application.
Example 1:
an extremely low wind speed calibration system comprises a probe 24, a closed chamber 14, a supporting rod 41 penetrating into the closed chamber 14 and a driving mechanism for driving the supporting rod 41 to move in the closed chamber; the probe 24 is connected to the supporting rod 41, the probe 24 is positioned in the closed chamber 14, and the supporting rod 41 is in soft sealing connection with the closed chamber 14;
and also includes a temperature regulating system, a pressure regulating system and a humidity regulating system for regulating the temperature, the pressure and the humidity in the closed chamber 14, respectively.
The driving mechanism comprises a moving platform 31 fixedly connected with the supporting rod 41, a rigid connecting piece 42 fixedly connected with the moving platform 31 and a power assembly for driving the rigid connecting piece 42 to do linear motion; also included is a grating scale 12 for measuring the distance of movement of the motion platform 31.
The power assembly can adopt any existing driving mode, and a synchronous belt transmission mode with small vibration is preferably adopted.
In a more preferred embodiment, the motion platform may be provided with guide rails to ensure stable motion thereof.
Example 2:
an extremely low wind speed calibration system is based on embodiment 1, as shown in fig. 6, the surface of the closed chamber 14 is provided with a slot for the strut 41 to pass through, and the slot is soft sealed by a flexible sealing material.
Preferably, the flexible sealing material is a rubber plastic plate 49, and a mode of forming a notch by a single rubber plastic plate or overlapping two rubber plastic plates can be adopted, so that the supporting rod can be pushed open.
As shown in fig. 5, the strut 41 of the present embodiment includes a thickened portion 411, an airfoil portion 412, and a thin rod portion 413 which are sequentially arranged; the thickened portion 411 is located outside the closed chamber 14, the thin stem portion 413 is located inside the closed chamber 14, and the airfoil portion 412 is located at the slit.
Example 3:
an extremely low wind speed calibration system is provided, as shown in fig. 3, in any of the above embodiments, wherein the strut 41 passes through the bottom of the closed chamber 14, and the motion platform 31, the power assembly and the grating scale 12 are all located below the closed chamber 14.
The principle of the whole calibration system in this embodiment is shown in fig. 1.
The enclosure 14 also includes an illumination system, a video monitoring system, and a mixing system.
The closed chamber 14 sequentially comprises a steel plate, a heat insulation layer and a heat conduction layer from outside to inside, and a plurality of heat exchangers are arranged on the heat conduction layer.
The temperature regulating system comprises a heating and refrigerating cycle machine, a constant-temperature water tank, a circulating pipeline and a temperature sensor, wherein the temperature sensor is used for monitoring the temperature of the closed chamber 14, and the circulating pipeline is positioned in the inner wall and/or the outer wall and/or the interlayer of the closed chamber 14;
the humidity regulating system comprises a humidifier, a circulating dehumidifier and a humidity sensor, wherein the humidity sensor is used for monitoring the humidity of the closed chamber 14;
the pressure regulating system includes a pressure equalization pipe 16 for equalizing the pressure inside and outside the closed chamber 14.
The pressure balance pipe collects pressure difference through the pressure difference transmitter, and the valve controller drives the pressure regulating valve, so that the regulating valve is opened when needed, the pressure inside and outside the closed chamber is balanced, and the pressure of the closed chamber is ensured to be consistent with the pressure outside the chamber during temperature and humidity regulation.
The embodiment can cover the streamline thermal-insulation moisture-insulation shell for the moving platform and is used for wrapping the hot wire host computer, the data acquisition computer and the like.
The experiment of the applicant proves that the embodiment can be suitable for calibrating the extremely low wind speed of 0.1-0.5 m/s.
Preferably, the mixing system may employ a fan.
Preferably, the heat conducting layer is an aluminum plate, and the circulating pipeline is in contact with the surface of the aluminum plate.
In a more preferred embodiment, in order to facilitate the replacement of the probe or the change of the angle of the probe, the copper tube row on the heat exchanger is also conveniently installed and inspected, and a corresponding sealing window door is arranged on the wall surface of the closed chamber.
In a more preferred embodiment, a rubber plastic plate with the thickness of 70mm is paved on the inner surface of the closed chamber, the heat transfer coefficient of the rubber plastic plate is 0.034W/m < 2 >. K, and the outer wall surface is formed by steel plate reinforced assembly welding with the thickness of 4 mm.
Example 4:
an extremely low wind speed calibration system is shown in fig. 2, and the difference between the embodiment and the embodiment 3 is that the extremely low wind speed calibration system further comprises a resident chamber 43 positioned below the closed chamber 14, a slot for a supporting rod 41 to pass through is arranged between the resident chamber 43 and the closed chamber 14, and the slot is sealed by a flexible sealing material in a soft way;
the motion platform 31 is positioned in the residence chamber 43; the rigid connecting piece 42 passes through the side wall of the residence chamber 43, and the rigid connecting piece 42 is in dynamic sealing fit with the side wall of the residence chamber 43; the power assembly and the grating ruler 12 are both positioned outside the residence chamber 43;
the temperature regulating system, the pressure regulating system and the humidity regulating system are respectively used for regulating the temperature, the pressure and the humidity in the closed chamber 14 to be the same as those in the resident chamber 43.
Example 5:
an extremely low wind speed calibration system is shown in fig. 4, and the difference between this embodiment and embodiments 3 and 4 is that the supporting rod 41 passes through the side wall of the closed chamber 14, and the moving platform 31, the power assembly and the grating scale 12 are all located on the side surface of the closed chamber 14; and also comprises a guide rail positioned in the closed chamber 14, and the support rod 41 is in sliding fit with the guide rail.
Example 6:
an extremely low wind speed calibration method, comprising:
connecting a probe of the hot wire anemometer to one end of the supporting rod, and enabling the end of the supporting rod to penetrate through the soft seal and enter a closed chamber;
the pressure in the closed chamber is regulated by a pressure regulating system, so that the pressure is equal to the pressure of the area outside the closed chamber and adjacent to the soft seal;
the temperature and the humidity in the closed chamber are regulated to a required state through a temperature regulating system and a humidity regulating system; in the process, the pressure regulating system always keeps working;
the driving mechanism drives the support rod to move along the soft seal for a specified linear distance at a specified speed, and probe data are recorded.
In a more preferred embodiment, the method of passing the strut through the soft seal into the containment chamber comprises: the surface of the closed chamber is provided with a slot for the supporting rod to pass through, the slot is provided with a flexible sealing material, and one end of the supporting rod is propped open from outside to inside to enter the closed chamber.
In a more preferred embodiment, the method of driving the strut by the drive mechanism comprises: the rigid connecting piece is driven by the power assembly to do linear motion, the rigid connecting piece drives the motion platform to synchronously move, and the motion platform drives the support rod to synchronously move; wherein the power assembly, the rigid connecting piece and the motion platform are all positioned outside the closed chamber.
In a more preferred embodiment, the linear distance is measured by the following method: the displacement of the motion platform or rigid connection is measured by a grating scale.
In a more preferred embodiment, a method of regulating the pressure in a closed chamber by a pressure regulating system comprises: the pressure difference transmitter is used for collecting the pressure difference between the inside and the outside of the closed room, the collected signals are transmitted to the regulating valve controller, and the regulating valve controller controls the pressure regulating valve to act.
In a more preferred embodiment, the temperature regulation system regulates the temperature within the enclosure by:
the upper computer sets the required working environment temperature, the temperature sensor measures the current temperature in the closed chamber to obtain the difference between the current temperature and the set temperature, and the difference is fed back to the temperature decision control system:
if the temperature difference is greater than or equal to the set threshold, adopting a constant-temperature water tank to regulate the temperature of the closed chamber until the temperature difference is less than the set threshold;
and if the temperature difference is smaller than the set threshold value, adopting a heating and refrigerating cycle machine to regulate the temperature of the closed chamber until the temperature in the closed chamber is equal to the set temperature.
In a more preferred embodiment, the humidity conditioning system conditions the humidity within the enclosure by:
the upper computer sets the required working environment humidity, the humidity sensor measures the current humidity in the closed chamber to obtain the difference between the current humidity and the set humidity, and the difference is fed back to the humidity decision control system:
if the current humidity is greater than the set humidity, circularly dehumidifying the closed chamber by adopting a dehumidifier until the current humidity is equal to the set humidity;
and if the current humidity is less than the set humidity, humidifying the closed chamber by adopting a humidifier until the current humidity is equal to the set humidity.
In a more preferred embodiment, the method for regulating the temperature and humidity in the closed chamber comprises the following steps:
starting a pressure regulating system;
starting a temperature regulating system until the temperature in the closed chamber reaches a required state;
keeping the temperature regulating system on, and starting the humidity regulating system; and as the humidity gradually approaches the required state, reducing the humidification amount/dehumidification amount, and simultaneously gradually reducing the opening size of a pressure regulating valve in the pressure regulating system until the temperature reaches the required state, and completely closing the pressure regulating valve.
In a more preferred embodiment, the method of recording probe data comprises:
closing the temperature regulating system and the humidity regulating system, and waiting for the stable air flow in the closed room;
the driving mechanism drives the supporting rod to linearly move along the soft seal at a specified speed, and a speed and time curve is displayed on the main control computer;
when the speed reaches the set requirement, the main control machine sends an acquisition instruction to the probe, records the current temperature, humidity and operating speed of the support rod in the closed chamber, and acquires the current atmospheric pressure and the temperature and humidity outside the closed chamber.
It should be noted that, in this embodiment, the movement of the motion platform is implemented by the synchronous belt, and the final position detection is measured by the grating ruler, and in addition, due to the limitation of speed matching, the driven servo motor cannot be directly connected with the driving synchronous pulley, and is connected with the driving synchronous pulley through the planetary reducer, so that the contradiction between the motion precision and the motion stability caused by the transmission of the transmission chain and the error of the synchronous belt is caused. Therefore, in order to meet the precision and stability of probe movement, the embodiment adopts double closed-loop control, namely, the position measurement is obtained by a grating ruler, the speed measurement is obtained by an encoder of a servo motor, and the control precision of 1.2 mu m is verified.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, the term "coupled" as used herein may be directly coupled or indirectly coupled via other components, unless otherwise indicated.
Claims (7)
1. An extremely low wind speed calibration system comprises a probe (24), and is characterized by further comprising a closed chamber (14), a supporting rod (41) penetrating into the closed chamber (14) and a driving mechanism for driving the supporting rod (41) to move in the closed chamber; the probe (24) is connected to the supporting rod (41) and the probe (24) is positioned in the closed chamber (14), and the supporting rod (41) is in soft sealing connection with the closed chamber (14);
the device also comprises a temperature regulating system, a pressure regulating system and a humidity regulating system which are respectively used for regulating the temperature, the pressure and the humidity in the closed chamber (14);
the driving mechanism comprises a moving platform (31) fixedly connected with the supporting rod (41), a rigid connecting piece (42) fixedly connected with the moving platform (31) and a power assembly for driving the rigid connecting piece (42) to do linear motion; the device also comprises a grating ruler (12) for measuring the moving distance of the moving platform (31);
the device also comprises a resident chamber (43) positioned below the closed chamber (14), a slot for a supporting rod (41) to pass through is arranged between the resident chamber (43) and the closed chamber (14), and the slot is sealed by a flexible sealing material in a soft way;
the motion platform (31) is positioned in the residence chamber (43); the rigid connecting piece (42) penetrates through the side wall of the residence chamber (43), and the rigid connecting piece (42) is in dynamic sealing fit with the side wall of the residence chamber (43); the power assembly and the grating ruler (12) are both positioned outside the residence chamber (43);
the temperature regulating system, the pressure regulating system and the humidity regulating system are respectively used for regulating the temperature, the pressure and the humidity in the closed chamber (14) to be the same as those in the resident chamber (43).
2. An extremely low wind speed calibration system according to claim 1, wherein the strut (41) passes through the bottom of the closed chamber (14), and the motion platform (31), the power assembly and the grating scale (12) are all located below the closed chamber (14).
3. An extremely low wind speed calibration system according to claim 1, wherein the strut (41) passes through the side wall of the closed chamber (14), and the motion platform (31), the power assembly and the grating scale (12) are all positioned on the side surface of the closed chamber (14);
the device also comprises a guide rail positioned in the closed chamber (14), and the support rod (41) is in sliding fit with the guide rail.
4. An extremely low wind speed calibration system according to claim 1, wherein the enclosure (14) further comprises an illumination system, a video monitoring system, a hybrid system.
5. An extremely low wind speed calibration system according to claim 1, wherein the struts (41) comprise thickened portions (411), airfoil portions (412), thin rod portions (413) distributed in sequence; the thickening portion (411) is located outside the closed chamber (14), the thin rod portion (413) is located inside the closed chamber (14), and the airfoil portion (412) is located at the slot.
6. The very low wind speed calibration system according to claim 1, wherein the closed chamber (14) comprises a steel plate, a heat insulation layer and a heat conduction layer from outside to inside in sequence, and a plurality of heat exchangers are arranged on the heat conduction layer.
7. An extremely low wind speed calibration system according to claim 1, wherein,
the temperature regulating system comprises a heating refrigeration cycle machine, a constant-temperature water tank, a circulating pipeline and a temperature sensor, wherein the temperature sensor is used for monitoring the temperature in the closed chamber (14), and the circulating pipeline is positioned in the inner wall and/or the outer wall and/or the interlayer of the closed chamber (14);
the humidity regulating system comprises a humidifier, a circulating dehumidifier and a humidity sensor, wherein the humidity sensor is used for monitoring the humidity in the closed chamber (14);
the pressure regulating system comprises a pressure balancing pipe (16) for balancing the pressure inside and outside the closed chamber (14).
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