JPS6315540B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a low-temperature environment wind tunnel experiment device capable of conducting various experiments in a low-temperature environment of several tens of degrees below zero.

[Background of the invention and prior art]

Low-temperature laboratories are playing an increasing role in various test and research studies, and wind tunnel laboratories for automobiles, for example, are no exception. There is a need to develop high-performance automobiles that not only ensure driving safety in cold regions and high-altitude regions, but also ensure that the various parts that make up the automobile perform as intended even in abnormal environments, in preparation for unexpected situations. Because there is.

Until now, in addition to road tests, large-scale wind tunnel tests for practical vehicles have tended to be emphasized due to their good reproducibility in the development of automobile technology, but as the development of higher-performance automobiles increases,
The need to create a low-temperature environment several tens of degrees below zero (for example, minus 30 degrees Celsius) in such large-scale wind tunnel tests has become a necessity.

Regarding the automobile wind tunnel laboratory, for example,
There are proposals for circulation type wind tunnels that can obtain low wind speeds, such as in Publication No. 183370, but they do not allow testing in low-temperature environments.

In addition, as a low-temperature environment test chamber, for example,
A test chamber in which the room temperature can be freely changed, such as the one proposed in Publication No. 54-107147, is known, but it is not a wind tunnel laboratory and wind tunnel tests cannot be performed.

[Problem that the invention seeks to solve]

Reliability, economy, and flexibility are required when constructing a large wind tunnel laboratory for practical vehicles that satisfies conditions such as maintaining the test temperature at, for example, -30°C during wind tunnel tests where the wind speed ranges from zero to, for example, 130 Km/hr. Gender becomes a major issue. In other words, it is possible to create an environment with good reproducibility that can maintain a predetermined low-temperature environment accurately and stably at a predetermined wind speed, and to produce a large volume of low-temperature air with the lowest possible equipment configuration without waste. and in a wind tunnel test chamber with the flexibility to test at room temperature, high temperature, and even at various temperatures with low or no wind speed. This is because it is also necessary to do so.

The present invention was made with the aim of solving such problems, and furthermore, it reduces the influence from outside the system when objects to be observed (for example, cars) enter and exit the system during actual operation, and also reduces the influence of the entire system. heat protection,
The purpose is to provide a low-temperature environment wind tunnel experiment device that is moisture-proof, dew-proof, soundproof, vibration-proof, etc.

[Structure and operation of the invention]

The gist of the present invention, which aims to achieve the above-mentioned object, is an environmental test chamber, a blower for sucking air in the downstream region of the test chamber and discharging it;
For the main air circulation system, which consists of an air cooler for cooling this discharged air and an outlet for blowing out the air that has passed through this air cooler into the test chamber, air in the downstream area of the test chamber is The present invention relates to a low-temperature environment wind tunnel experiment apparatus (the invention set forth in claim 1, hereinafter referred to as the first invention), which is connected to an auxiliary circulation system for air circulating to the upstream region of the test chamber via a conditioner.

In other words, an air cooler capable of cooling the air to below zero degrees Celsius is configured to form a main air circulation system that is placed on the discharge side of the blower and upstream of the air outlet to the test chamber. In contrast, an auxiliary circulation section for air conditioning equipped with an air conditioner is connected in a predetermined relationship, that is, in a relationship that circulates air from the downstream area of the test room to the upstream area of the test room. shall be. Therefore, the main circulation system is equipped with functions to obtain the wind speed and air volume necessary for wind tunnel tests, and is configured so that low-temperature air can be produced with that air volume. The functions of creating a low-temperature test environment with low speed or no wind speed, and creating a test environment with room temperature or high temperature are achieved by the auxiliary circulation system, and a part of the cooling function is supplemented by the auxiliary circulation system. This is a major feature of the present invention.

Here, the air conditioner for the auxiliary circulation system uses a device with a normal air conditioning function that is equipped with an air filter, an air cooler, an air heater, and the like. A blower is also installed in this auxiliary circulation system, and the blower supplies air from the downstream side of the test chamber to the upstream side of the test chamber after passing through the air conditioner. On the other hand, in the main circulation system, installation of air filters, air heaters, etc. is omitted.

For example, in an experiment in a low-temperature environment with a high wind speed of about -30°C at a wind speed of 130 km/hr, the main circulation system blower and the main circulation system air cooler should be operated to meet these conditions. If necessary, a portion of the circulating air is also circulated to the auxiliary circulation system.
Due to this partial circulation to the auxiliary circulation system, dust in the circulating air is removed by the air filter of the auxiliary circulation system. Furthermore, by using the air cooler in the auxiliary circulation system, it is possible to cover the design load even if the capacity of the air cooler installed in the main circulation system is reduced. On the other hand, in the case of environmental experiments under low or no wind speed, the main circulation system blower is stopped and
The test can be performed simply by circulating air to the auxiliary circulation system. In this case, in addition to obtaining low-temperature air using the air cooler of the air conditioner, high-temperature air can also be obtained using the air heater.

In addition to the device configuration of the first invention, the present invention also provides a path for introducing outside air into both the main circulation system and the auxiliary circulation system, and a cooler and a dehumidifier are interposed in this outside air introduction path. The present invention provides a low-temperature environment wind tunnel experiment device (invention as set forth in claim 2, hereinafter referred to as the second invention) characterized by the following.

The present invention is based on the principle of testing by air circulation (that is, by reusing the air inside the device), but changes in the air condition due to the test object, such as automobile exhaust or dust, are important. In cases where air temperature or air contamination is caused by air pollution, it is often necessary to exhaust the air to the outside of the system. In this case, it is necessary to take in air into the system that corresponds to the amount of exhaust air, but when taking in this air, the outside air is dehumidified and cooled, and then the air is sent to the main circulation system and auxiliary circulation system. The configuration is such that the power supply is supplied. In particular, when outside air is introduced into an air circulation system at temperatures below zero, condensation can cause unexpected problems and have a negative impact on test reproducibility. Introducing it also causes disturbances in the temperature distribution in the test room. For this reason, both the main circulation system and the auxiliary circulation system are provided with a path for taking in outside air, and a cooler and a dehumidifier are interposed in this path to cool the air to the required temperature and dehumidify it.

Furthermore, in the present invention, in addition to the configuration of the apparatus of the first invention, an entrance/exit for the object to be measured is provided on the abutment wall of the direction deflection section extending from the test chamber to the suction side of the main circulation system blower, and an entrance/exit of the object to be measured is provided in the direction deflection section. A deflection vane is provided to deflect the airflow from the test chamber to the main circulation system blower, and this deflection vane is installed at a position where it can block the passage leading to the blower when the object to be measured enters and exits, and the entire direction of the deflection vane can be changed. A low-temperature environment wind tunnel experiment device (as claimed in the patent claim) in which each blade of the deflection vane is supported by a pantograph mechanism so as to function as a shutter to block outside air from entering the passage from the entrance/exit when the deflection vane is in a position to block the passage. The present invention provides the invention described in Scope No. 3 (hereinafter referred to as the third invention).

In the present invention, most of the air blown into the test chamber is circulated back into the test chamber, so several corners are formed in the main circulation system. A corner section (direction deflection section) is also formed in the section leading from the test chamber to the main circulation system blower, and deflection vanes are installed in this direction deflection section to prevent pressure loss due to change in direction of airflow. On the other hand, an entrance/exit for the object to be measured is provided in the abutment wall of the direction deflection section (the abutment wall located downstream of the deflection vane). In this case, if the entrance/exit of the object to be measured is opened to allow the object to enter/exit the test chamber, if the deflection vane is in that position, it will obstruct the entrance/exit of the object. The entire deflection vane is configured to be able to change its direction in a position that blocks the path leading to the blower so that a movement path for the object to be measured is formed between the Each wing of the deflection vane is supported by a pantograph mechanism so that it functions as a shutter that blocks the passage of airflow.
With this configuration, the object to be measured can be freely entered and exited from the test chamber through the entrance/exit with the deflection vane set in the passage leading to the blower in a shutter state, and at the same time, the object to be measured can be moved from outside the system to inside the system. The shutter function prevents air entering the fan from flowing toward the blower.

〔Effect of the invention〕

Effects of the first invention Even if you try to conduct a low-temperature test at zero or very low wind speed using the air cooler in the main circulation system, if the amount of air passing through the air cooler is small or almost non-existent, the air cooling It is virtually impossible to cool the air to the required temperature using a container. Therefore, for example, even the heat generated in the test room (heat generated by automobile exhaust, lighting equipment, etc.) may not be completely covered by the air cooler in the main circulation system. According to the device configuration of the first invention, when testing in a region where the wind speed is zero or low,
The air in the test room can be sent to the auxiliary circulation system, where it is heated to a predetermined temperature and then supplied to the test room, making it possible to perform stable and continuous tests even in the range of 0 to low wind speeds using only the air conditioner of the auxiliary circulation system. You will be able to do it. For example, the cooling function of the auxiliary circulation system even in a low-temperature test environment with no wind or low wind speed (in this case, the system including the main circulation system and the auxiliary circulation system is usually maintained at a low temperature environment). This alone is sufficient to cover the heat generation load in the test room.

Furthermore, the air filter and air heating heat exchanger are separated from the main circulation system and added to the auxiliary circulation system, and part of the cooling function of the air cooler in the main circulation system is provided by the air cooler in the auxiliary circulation system. This reduces pressure loss in the main circulation system in which a large amount of air circulates, and this reduction in pressure loss allows the power of the main blower to be significantly reduced. Since the capacity of the large air cooler installed in the main circulation system can be reduced, the capacity of the refrigeration equipment can be reduced, resulting in energy-saving and low-cost equipment.

Effects of the Second Invention In addition to the effects of the first invention, the second invention can prevent frost formation on the air cooler, which is a problem when conducting low-temperature environment tests over a long period of time. That is,
By dehumidifying the air taken into the system in advance, it is possible to reduce frost formation on the air cooler, thereby suppressing a decrease in the cooling capacity of the air cooler and an increase in ventilation pressure loss due to frost formation. be able to. In addition, low costs are achieved since the problem of drain treatment is avoided and the capacity of the air cooler is not increased unnecessarily.

Effects of the Third Invention In addition to the effects of the first invention, in the third invention, when replacing the object to be measured (automobile), if the deflection vane is put into the shutter state and the passage leading to the blower is blocked, the rear part of the test room can be removed. When warm, moist, light air enters through the entrance and exit of the test room at the same time as a car enters and leaves the test room, this can be prevented from rapidly flowing out into the circulation system at the rear of the test room (upstream of the test room). The intrusion of outside air means the intrusion of water vapor, which contains a high concentration of water vapor, which condenses on the low-temperature parts of the system and eventually re-evaporates during the test, causing frost to form on the air cooler. According to the configuration of the third invention, this is suppressed and it becomes possible to carry out a stable test for a long time.

The apparatus of the present invention will be explained in detail below according to the embodiments shown in the drawings.

〔Example〕

As shown in FIG. 1, the main components of the apparatus of the present invention include an environmental test chamber 1, a blower 2 for sucking air in the downstream area of the test chamber 1 and discharging it, and a blower 2 for cooling the air discharged from the blower. an air cooler 3 for
A main air circulation system is formed by the air outlet 4 for blowing out the air that has passed through the air cooler 3 into the test chamber 1, and air in the downstream area of the test room is further supplied to this main air circulation system. An auxiliary circulation system for circulating air to the upstream region of the test chamber is connected via an air conditioner 5. Further, an outside air introduction path 6 is provided for both air circulation systems, and a cooler 7 and a dehumidifier 8 are interposed in this outside air introduction path 6. Furthermore, a biased flow vane 9 is provided on the suction side of the main circulation system blower 2, which also functions as a shutter.

In the example shown in Figure 1, the main circulation system has an environmental test chamber 1 installed horizontally on the lower floor, and a wind tunnel with a blower 2 and an air cooler 3 installed on the upper floor to create a unidirectional circulation path for airflow. The entire circulation path is set inside the building with a heat-proof and moisture-proof structure as described below.

The environmental test chamber 1 is a wind tunnel with a substantially equal cross-section, and a roller 10 is installed on the floor to allow the driving wheels of a car to be placed around it, and a roller 10 is installed on the floor to guide the car exhaust to the outside of the system. A flexible hose 11 is provided. The blower 2 for providing vehicle wind speed to this test chamber is, for example, an axial flow blower with front and rear stator vanes with stator blades attached at the front and rear of the blade, and the wind speed is adjusted by a continuously variable speed electric motor 12. It's summery. In order to prevent the air velocity distribution within the cross section of the wind tunnel from being disturbed by the annular high-speed flow of the axial blower 2, the blower 2 is placed close to the downstream side of the laboratory 1, and the air velocity distribution in the radial direction is different. Diff user 13 with sufficient length to alleviate
is provided on the blower discharge side. The air cooler 3 is placed at a position with a sufficient distance so that non-uniformity of the air flow in the radial direction is alleviated by the stationary blades of the blower and the differential user 13 to obtain uniform air velocity. That is, in order to prevent unevenness in the degree of cooling of the air due to unevenness in the inflow air speed, the air cooler 3 is arranged at a position where the annular nonuniform velocity distribution caused by the blower 2 is sufficiently reduced for practical purposes.

In the path from the air cooler 3 to the outlet 4, the direction of the airflow is changed by 180°. Airfoil-shaped equally spaced vanes 14 and 15 are provided to suppress pressure loss due to this direction change. This vane 14,1
No. 5 has a special structure with a noise-muffling function, as will be described later. The vanes 14 and 15 can reduce the blowing power by reducing the pressure loss, and also serve to reduce the degree of inconsistency in the regular inconsistency distribution of the boundary layer wake of the blade row. become.

A rectifying cavity 16 is provided in front of the air outlet 4 to alleviate the non-uniform velocity distribution inevitably caused by the deflection vanes 14 and 15. For this purpose, a rectifying screen 17 consisting of, for example, four meshes is vertically stretched over the rectifying cavity 16. Further, a contraction cavity 18 is provided on the downstream side of the rectifying screen 17, and by optimizing the aperture ratio, the turbulence that remains even with the rectifying screen 17 is attenuated. Also,
The lateral uniformity of the airflow is achieved by configuring the wind tunnel so that there is no asymmetry in the lateral direction, and by preventing swirling flow using rear stator vanes installed behind the blower blades.

Next is the auxiliary circulation system, which is one of the features of the device of the present invention.This system can cope with the heat load for experiments at zero wind speed, and by transferring the air cleaning function and air heating function to the auxiliary system. By reducing the pressure drop in the main circulation system, which has a large air volume, and by transferring part of the capacity of the air cooler 3 to the auxiliary circulation system, the pressure drop here is also reduced, and overall accuracy is improved while saving energy. Provided to improve stability.

The outlet 20 of this auxiliary circulation system to the laboratory 1 is
A rectifier 21 having a honeycomb structure is installed over approximately the full width of the chamber above the air outlet 4 of the main circulation system. On the other hand, the suction port 22 of this auxiliary circulation system
It is also provided laterally to the side of the main circulation system blower suction section in the downstream region of the test chamber 1 so as to be symmetrical and not to cause turbulence in the airflow of the main circulation system. The air conditioner 5 installed in this auxiliary circulation system includes a blower 2
3. A heater 24, a cooling coil 25, and a filter 26 are installed inside.

Next, the air conditioning equipment of this device will be explained.
A refrigerator 30 produces cold energy for air cooling to create a low temperature environment of about -30° C. at a vehicle wind speed of 130 kg/hr. The refrigerator 30 is, for example, a two-stage compression and one-stage expansion refrigerator using a screw compressor. With this two-stage compression system, in the case of medium-low temperature refrigeration load experiments, it is possible to operate only by operating the high-pressure stage alone. This set of 301 refrigerators allows a configuration in which both the main circulation system and the auxiliary circulation system are cooled at the same time. That is, the refrigerant liquid of the refrigerator 30 is forcedly circulated to the air cooler 3 of the main circulation system and the cooling coil 25 of the air conditioner of the auxiliary circulation system,
The direct expansion method allows air to be cooled by boiling it in each cooling coil. The cooling water of the refrigerator 30 is sent to a cooling tower 31 for cooling. Thereby, the air within the system can be cooled to a predetermined value and stably maintained at an arbitrary value. On the other hand, the air within the system is purified by the air filter 26 of the air conditioner 5 in the auxiliary circulation system, and the air filter can be omitted in the main circulation system. Omitting the air filter in the main circulation system has a great effect in that it makes it possible to prevent an increase in the overall installed capacity due to an increase in pressure loss that would otherwise occur. Even with the filter 26 of this auxiliary circulation system, air purification can be achieved in an extremely short time. For example, the average dust concentration in the system air (air inside test room 1) is halved every 3 to 3.5 minutes for invisible dust that requires colorimetric measurements, and for gravimetric measurements. Purification of such coarse dust particles is achieved at a rate of halving approximately every 1.1 minutes. Therefore, even if, for example, dust adhering to a vehicle is blown away by the wind speed of the vehicle, the air in the test chamber can be purified in a very short time, making it possible to improve the test environment.

Fresh air is introduced into the system through an intake port 35 located on the blower suction side of the main circulation system and an outside air introduction path 6 connected to the suction side pipe line 36 of the air conditioner 5 of the auxiliary circulation system. A pre-cooler 7, a dehumidifier 8, and an after-cooler 38 are installed in this outside air introduction path 6 in this order from the outside air intake port 37. The dehumidifier 8 has a structure in which two systems of adsorption towers using, for example, activated alumina as an adsorbent are alternately used.
The temperature shall be below 50℃. The purpose of introducing dehumidified air is to lower the humidity in the system and prevent frost formation on the cooling coils. This dehumidifier 8 is provided with a bypass path 41, and when it is necessary to adjust the relative humidity of the air to a predetermined value depending on experimental conditions, humid air is taken in from this bypass path 41. There is. For example, when conducting a defrosting experiment on the surface of a vehicle windshield, if the relative humidity of the airflow is too low, the sublimation rate of the ice film on the windshield surface increases, and its influence on the experimental results cannot be ignored. In such a case, by adjusting the air passing through the bypass path 41, it is possible to increase the relative humidity.

Intrusion of outside air into the system inevitably occurs when vehicles are replaced. Vehicles are changed by opening and closing the test room rear door 45. If outside air enters the blower during this replacement, dew and frost will form on various devices and walls, causing inconveniences such as frost formation on the cooling coil due to increased moisture in the system. In order to prevent this, this device is designed so that the deflection vane 9 on the downstream side of the test chamber 1 also has a shutter function. That is, this deflection vane 9
It is rotatably supported using the downstream ceiling of the
As shown in the figure, when the vane is rotated toward the ceiling (details will be described later in Figure 9), each vane rotates about 90 degrees while narrowing the distance from each other. They come into contact with each other on the flat and are stowed away as a shutter that completely blocks the passage toward the blower 2. For this reason, the support rods that support each wing are equipped with a pandagraph mechanism. The up and down movement of the airflow control means 9 is performed by a hoisting mechanism using a chain, and a reduction gear and an automatic stop device can be incorporated to ensure safe operation.

Depending on the experimental conditions, it may be necessary to raise the temperature within the system or dry the system. This heating of the air within the system can be achieved by absorbing power by operating the blower 2 at high speed. In addition, in case it is desired to increase the temperature rise rate, a heater 24 is attached to the air conditioner 5 of the auxiliary circulation system.
By operating this heater, the temperature increase in the system can be appropriately controlled.

Depending on the conditions of the experiment, this low-temperature environment experimental device can maintain a temperature difference of 50 to 60 degrees Celsius between the inside and outside of the system for a long period of time. For this reason, special measures are required for heat protection, moisture protection and dew protection. In addition, the present device includes various means as described below.

As shown in FIG. 2, the structure of the walls and ceiling of the test chamber 1 includes, in order from the concrete building frame 50, a moisture-proof layer 51, a heat-insulating material layer 52, a moisture-proof layer 53, and an air layer 5.
4. Consisting of a steam wool layer 55 and a punched metal layer 56, the steel framework (for example, beams and columns) is built inside the insulation layers 51, 52, and 53, that is, on the indoor side, and the metal members such as the steel frame are installed indoors and outdoors. It is designed to eliminate heat bridges that act as bridges for heat.

As shown in Figure 3, the floor structure of laboratory 1 consists of a concrete building frame 50', a moisture barrier layer (plastic sheet containing aluminum foil) 51', and a fiber-reinforced concrete (FRC) board attached to the top surface. Foam polystyrene heat insulation layer 58, moisture proof layer (synthetic rubber sheet) 59, buffer layer 60, pressing mortar layer 6
1. It is constructed by laminating sandwich panel layers 64 with an aluminum honeycomb core 63 sandwiched between steel plates 62 and 62'. In addition, in FIG. 3, 65 indicates a silicon filling layer for absorbing thermal expansion and contraction. With this floor structure, the heat capacity can be made very small, which can greatly contribute to shortening the cooling time of the device.

For wiring penetrations that connect the low-temperature environment inside the system with the outside, moisture from outside the system must not enter the system, and condensation must not occur outside due to cooling of the wiring outside the system through the conductor. is required. For this reason, the wiring penetration part of the device of the present invention is as shown in FIG.
Structural wall 7 that partitions the inside of the system 70 and the outside of the system 71 (measurement room)
A frame body 73 (for example, a wooden frame) is fitted through the frame body 73, and the covered electric wire 74 is passed through the frame body 73 with a heat-insulating and moisture-proof structure, and the cold and heat of the electric wire 74 is gradually removed from the system on the outer surface of the frame body 73. Efforts have been made to create a temperature gradient towards the temperature. That is, the electric wire 74 is passed through a resin tube 75 (for example, a hard PVC tube), and the gap between the electric wire 74 and the resin tube 75 is filled with a filler material such as a silicone sealant 76, and the gap between the resin tube 75 and the frame 73 is closed. The foamed urethane 77 is filled with a heat insulating material such as urethane foam 77.
A paint film-type moisture-proof layer 78 is applied to the boundary between the frame body 73 and the frame body 73 to form a heat-insulating and moisture-proof structure. A cone (for example, a silicone cone) 79 whose diameter gradually decreases toward the outside is formed on the resin pipe 75 on the outer surface of this heat-insulating and moisture-proof structure. That is, the resin tube 75 is made to protrude from the frame 73 to the outside by an appropriate length depending on the cross-sectional area of the conductor and the outer diameter of the resin tube 75, and the resin tube 75 is thickened at the base and thinned at the end on the outside of the protruded resin tube 75. The cone 79 is made of a thermally conductive material such that the surface temperature of the cone 79 is almost uniform, and the temperature difference with the outside air is such that dew condensation does not occur under normal conditions, corresponding to the amount of heat transfer that is approximately proportional to the cross-sectional area of the conductor. As a result, the conductor inside this cone 79 is heated almost uniformly by the outside air and has a temperature gradient, thereby preventing dew condensation in this area. It is designed to prevent this.

Regarding the terminal box installed for thermocouples and other temperature measurement or control wiring from the test room 1 inside the system to the control room outside the system, it is necessary to install this on the wall of the test room 1. condensation becomes a problem. The terminal box of the apparatus of the present invention has a structure as shown in FIG. 5, for example. That is, a frame 83 is installed through a wall surface 82 that separates a cold room (test room) 80 and a room temperature room (control room) 81, and a panel 84 with low thermal conductivity is attached to the cold room side of this frame 83. Panels 85 with high thermal conductivity are pasted on the room temperature side of this frame 83 to form a box, and a heat insulating material 85 is placed toward the panel 85 on the room temperature side within this box.
are filled, and connection terminals 87 and 88 are provided on both panels to make a mutually conductive connection. Alternatively, a moisture-proof layer 89 is provided on the inner surface of the frame 83, and a casing 90 is attached to the outer side of the panel 84. The panel 84 with low thermal conductivity is made of a resin such as bakelite or ebonite, the panel 85 with high thermal conductivity is made of a material such as marble or granite, and the heat insulating material is made of urethane foam, for example. Also, the connection end of the conductor 91 inside the box to the room temperature side panel 85 is connected to the conductor 91 inside the box.
and panel 85 are connected to each other so as to have good thermal conductivity. As a result, the cold heat transmitted by the conducting wire 91 is diffused by the panel 85, the cooling of the conducting wire in the room temperature side is eased, and dew condensation can be effectively prevented.

The blower 2 installed in the main circulation system is also cooled by contact with the cold air, causing dew condensation to occur on members that come into contact with the outside temperature of the system via its rotating shaft and bearings. Therefore, in this device, as shown in FIGS. 1 and 6, the power transmission section from the electric motor 12 installed outside the system to the blower 2 inside the system is directly connected to at least the cooled member inside the system. The power transmission section is surrounded by a casing 95, and the system outer end of this casing 95 is opened, and this casing 95
The structure is such that dehumidified air is introduced near the inner end of the system. This dehumidified air can be made by using a part of the air that has passed through the dehumidifier 8 and introduced into the casing 95 by a fan 96. As a result, the blower rotating shaft, bearing, and all-floating intermediate shaft can be surrounded by dehumidified air having a dew point below their lowest temperature, and dew condensation can be effectively prevented.

Heat-proofing and moisture-proofing treatments are also required for the entire device or the basic structure that supports the air conditioner 5. In the device of the present invention, in building this foundation,
Create the foundation of the structure as shown in Figure 6. 6th
Although one of the many foundations is visible in the figure, foundations similar to foundation 98 shown in FIG. 6 are present throughout the apparatus. This foundation 98 is made of concrete 99
A pot or groove 100 of an appropriate size is constructed in advance, a heat-proof and moisture-proof layer 101 is applied to the inner surface of the pot or groove 100, a protective mortar is laid on top of it, and after this mortar has hardened, the interior is A foundation 102 is created by assembling reinforcing bars and pouring concrete. As the heat insulating material, for example, a polystyrene foam plate can be used, and as the moisture barrier material, for example, a plastic sheet containing aluminum foil can be used.

The device of the present invention is a closed system, and it is necessary to reduce the noise generated by the main circulation system blower. For this reason, the following two soundproof treatments are adopted in the device of the present invention in this airflow deflection section. One of them is that the airfoil-shaped equally spaced vanes 14 and 15 are devised so that they themselves have a silencing function. That is,
The vanes 14 and 15 have a structure in which rock wool is filled in a perforated steel plate, and by arranging them at equal intervals, a sound-dampening effect is exhibited. Part 2
A special muffler 105 (FIGS. 1 and 6) is placed in the passageway from the downstream area of the test chamber 1 to the blower 2. This muffler 105 has a double cylinder made of perforated aluminum plates, and the gap between the inner and outer cylinders is filled with rock wool, so that the open end of the cylinder formed in this way forms a grid pattern in the cross section of the airflow. This is a large number of arrays. Furthermore, the walls and ceiling of the test chamber 1 not only have the heat insulation function described above, but also have a sound absorption function due to the presence of air layers and punched plates. In this way, the noise inside the device can be significantly reduced.

For vibration isolation of the electric motor 12 due to the drive of the blower 2, a support stand 1 for the electric motor 12 as shown in FIG.
This can be effectively dealt with by constructing 06. This anti-vibration support stand 106 is an inverted V-shaped symmetrical body with the motor base stand 107 at its apex.
It is a concrete structure with steel stays 108 inserted inside. This inverted V-shaped symmetrical steel frame stay 108 increases the rigidity in the vertical and horizontal directions, resulting in a very good vibration isolation effect.

The low-temperature environment experiment apparatus of the present invention requires sampling the air in the test chamber 1 as appropriate and monitoring the air condition. Since this sampling air is low-temperature air, it is necessary to use a dew point meter, etc. It is necessary to heat it before guiding it to the detector.
For this heating, as shown in FIG.
11 is disposed, sampling air is guided to this heat exchanger 111 and heat exchanged to heat it, and then sent to the air measuring device 112.

FIG. 8 is a control system diagram for controlling the pressure inside the environmental test chamber 1 and controlling the exhaust from the automobile exhaust pipe. According to this figure, an example of controlling the pressure (introduced air amount) in the test chamber 1 will be explained first. Detecting the flow rate of the introduced air and controlling the rotational speed of a continuously variable speed electric motor for driving the blower 40 of the external air conditioner using the indicating controller 121.
The amount of air introduced is kept essentially constant. At that time, when the air conditioner 5 of the auxiliary circulation system is operating the blower 23, the control valve 122 is opened and the control valve 123 is closed, and this fresh air is introduced into the test chamber 1 from the auxiliary circulation system. Ru. On the other hand, when the blower 23 is not operating, the control valve 122 is closed,
With the control valve 123 open, fresh air is introduced into the test chamber 1 through the inlet 35 of the main circulation system. Further, when the blower 40 of the external air conditioner is not in operation, both the control valves 122 and 123 are closed, and the fresh air introduction system and the test room are cut off. This control valve 122
and 123 are controlled by control logic 124.

Next, to explain exhaust control, test room 1
The exhaust fan 125 that directly exhausts the air is driven by a continuously variable speed electric motor, and the exhaust connection pipe 127 that connects to the exhaust pipe 126 of the vehicle is connected with a gap between the exhaust pipe 126 and the exhaust fan 125 that is driven by a continuously variable speed electric motor. Use a device that can suck in the air inside the test room as well as exhaust the air. 130 is a differential pressure gauge, and this differential pressure gauge 130 detects the pressure difference between the pressure inside the test chamber 1 and the atmospheric pressure, and this differential pressure is maintained constant at an appropriate value between several mm and several tens of mm in the water column. Adjust the indicating controller 1 so that
31 controls the rotational speed of the exhaust fan 125 and adjusts the exhaust amount. As a result, the pressure in the test chamber can be controlled in response to relatively slow fluctuations in the engine load of the automobile. At this time, the differential pressure is maintained so that the pressure in the test chamber is slightly higher than the atmospheric pressure to prevent outside air from entering and to prevent condensation and frost due to moisture in the outside air.

132 is a differential pressure gauge for detecting the pressure difference between the pressure inside the exhaust pipe 128 and the pressure inside the test chamber 1;
When the differential pressure detected by this differential pressure gauge 132 is about to fall below a certain relatively small set value,
The indicating controller 133 increases the rotational speed of the exhaust fan by giving priority to the signal transmitted by the controller 133 in order to maintain the set value. Note that 134 is a control logic device. That is, this vehicle exhaust is prevented from being released into the test chamber during relatively rapid changes in vehicle engine load. To be more specific, in a steady state, the pressure in the exhaust pipe 128 is lower than the pressure in the test chamber due to the suction force of the exhaust fan 125, but as the engine load suddenly increases, the displacement suddenly decreases. When the air volume increases, the air volume within the test chamber system is large, so even with this rapid increase in displacement, the pressure within the test chamber will rise slowly, and according to the value detected by the differential pressure gauge 130, the rotational speed of the exhaust fan 125 will also increase slowly, and the suction amount will increase slowly. There is a risk that the exhaust volume will not be able to keep up with the volume of automobiles, and that automobile exhaust will be emitted into the test room and pollute the indoor air. In order to prevent such a situation from occurring, when the differential pressure detected by the differential pressure gauge 132 is about to fall below the set value, the exhaust fan is set so that the indicating controller 133 keeps it at the set value. The rotational speed of 125 is increased preferentially.

FIG. 9 is a diagram for supplementary explanation of the aforementioned deflection vane which also functions as a shutter. As partially shown in FIG. 6, this deflection vane is located at a position where it functions as a deflection vane (9 indicated by a solid line in FIG. 6) and at a position where it functions as a shutter (9 indicated by a broken line in FIG. 6). ). As this structure, a pantograph is used as schematically shown in FIG. That is, each wing 140 is fixed to one of the links of the pantograph mechanism 141 that is parallel to each other (indicated by a dashed line in the figure) and supported at equal intervals,
Each wing 140 when the pantograph is fully extended
The directions of the blades 140 are parallel to each other so that they function as deflection vanes, and when the pantograph is retracted, the directions of each blade 140 are aligned in one plane and function as a single shutter surface. At that time, one end 142 of the pantograph mechanism 141 is rotatably supported on the ceiling of the corner, and the pantograph mechanism 14
The hoisting chain 14 attached to the other end 145 of 1
6 allows for movement. In this embodiment, the position that functions as a shutter is a position that closes off the ceiling opening leading from the test chamber to the blower, as shown in FIG. By storing the deflection vane in the ceiling opening as a shutter, the object to be measured can be freely entered and exited from the entrance/exit 45 into the test chamber, and at the same time, the air entering and exiting the system can be This can prevent it from flowing to the side.

In this way, the present invention provides a complete low-temperature wind tunnel experimental device that can stably and accurately realize severe and large-airflow low-temperature environmental conditions, such as -30°C and wind speed of 130 km/hr, in an energy-saving manner. In addition, low wind speed, no wind speed, room temperature,
The objective is to provide an economical and flexible device that can satisfactorily perform multi-purpose missions such as high temperature testing.

[Brief explanation of the drawing]

Fig. 1 is an equipment layout system diagram showing an embodiment of the device of the present invention, Fig. 2 is a sectional view showing the test chamber wall or ceiling structure, Fig. 3 is a sectional view showing the test room floor structure, and Fig. 4 is a sectional view showing the test chamber floor structure. A cross-sectional view showing the dew-proof structure of the wall penetration part of the wiring connecting the test room and the outside, Figure 5 is a cross-sectional view of the terminal box for connecting the test room and the control room, and Figure 6 is the main circulation. FIG. 1 is an enlarged sectional view showing the blower part of the system and the base of the device, FIG. 7 is a front view of the vibration-proof support for the blower motor, and FIG. 8 is a control for controlling the pressure in the test chamber of the device of the present invention. The system diagram, FIG. 9, is a schematic sectional view for explaining a deflection vane that also functions as a shutter according to the present invention. 1... Test room, 2... Blower, 3... Air cooler, 4... Outlet, 5... Air conditioner, 6... Outside air introduction route, 7... Cooler, 8... Dehumidifier, 9
...Deflection vane that also functions as a shutter, 1
4, 15... Deflection vane, 20... Auxiliary circulation system outlet, 24... Heater, 26... Filter, 30... Refrigerator, 105... Silencer, 111
……Heat exchanger.

Claims (1)

[Scope of Claims] 1. An environmental test chamber, a blower for sucking in air in the downstream region of the test chamber and discharging it, an air cooler for cooling the discharged air, and an air cooler that passes through the air cooler. An auxiliary air circulation system is connected to the main air circulation system consisting of an air outlet for blowing air out into the test chamber, and an auxiliary air circulation system that circulates air from the downstream area of the test room to the upstream area of the test room via an air conditioner. A low-temperature environment wind tunnel experimental device. 2. An environmental test chamber, a blower for sucking in air from the downstream area of this test chamber and discharging it, an air cooler for cooling this discharged air, and an air cooler that supplies the air that has passed through this air cooler to the test chamber. An auxiliary air circulation system is connected to the main air circulation system, which consists of an air outlet for blowing out air, and an auxiliary air circulation system that circulates air from the downstream area of the test room to the upstream area of the test room via an air conditioner. A low-temperature environment wind tunnel experiment device that has a path for introducing outside air into the circulation system, and a cooler and dehumidifier installed in this outside air introduction path. 3. An environmental test chamber, a blower for sucking in air from the downstream area of this test chamber and discharging it, an air cooler for cooling this discharged air, and an air cooler that supplies the air that has passed through this air cooler to the test chamber. An auxiliary air circulation system is connected to the main air circulation system, which consists of an air outlet for blowing air, and an auxiliary air circulation system that circulates air from the downstream area of the testing room to the upstream area of the testing room via an air conditioner. An entrance/exit for the object to be measured is provided on the end wall of the direction deflection section leading to the suction side of the circulation system blower, and a deflection vane is provided in this direction deflection section to deflect the airflow from the test chamber to the main circulation system blower. A shutter that is installed so that its entire direction can be changed in a position that blocks the passage leading to the blower when the object to be measured is taken in and out, and that blocks outside air from entering the passage from the entrance/exit when it is in a position that blocks the passage. A low-temperature environment wind tunnel experiment device in which each blade of the deflection vane is supported by a pantograph mechanism so as to function as a pantograph mechanism.