JP7111637B2 - Artificial climate chamber and environmental test method - Google Patents

Description

The present invention relates to a climate chamber and an environmental test method.

2. Description of the Related Art Conventionally, artificial weather chambers are known that are used for environmental tests to evaluate the quality, performance, etc. of various products and parts under various weather environments such as solar radiation, rainfall, snowfall, fog, and atmospheric pressure. As one of such artificial weather chambers, there is an environmental test apparatus capable of reproducing a fog environment in a test chamber, as described in Patent Document 1.

The environmental test apparatus described in Patent Document 1 includes an environmental test chamber, a two-fluid nozzle for spraying fine water particles into the environmental test chamber, and a blower for introducing outside air into the environmental test chamber. A foggy environment is created by water particles suspended in the air. In this device, the density of the fog in the test room is changed by adjusting the amount of water sprayed from the two-fluid nozzle and the ventilation amount of outside air by the blower.

JP-A-11-51823

The environmental test apparatus described in Patent Document 1 is an apparatus capable of reproducing a foggy environment in a test room, but it is not capable of reproducing how environmental factors such as rain, snow and fog change. For this reason, it has been difficult to reproduce weather conditions in the actual environment, such as how rain turns to snow, how rain falls and freezes after the snow stops, or how haze occurs after the rain stops. .

The present invention has been made in view of the above problems, and an object thereof is to provide an artificial weather chamber and an environmental test method capable of artificially reproducing weather conditions close to those in the actual environment.

An artificial climate chamber according to one aspect of the present invention comprises a test chamber in which a test space in which a test object is placed is formed, a nozzle mechanism for ejecting at least water into the test space, and at least water out of water and air. A supply mechanism for supplying to the nozzle mechanism and a control unit for controlling the supply mechanism are provided. The control unit is configured to switch between at least two operations out of a rain operation that reproduces a rain environment in the test space, a snow operation that reproduces a snow environment in the test space, and a fog operation that reproduces a fog environment in the test space. and controlling the supply mechanism to switch at least water supply conditions among water and air to the nozzle mechanism.

In this artificial weather chamber, at least two operations among the rainfall operation, the snowfall operation, and the fog operation are switched by switching the supply condition of at least water among water and air to the nozzle mechanism by the control unit. This makes it possible to reproduce in the test space how at least two environmental factors out of rain, snow, and fog change, and to artificially reproduce meteorological conditions close to the actual environment.

In the artificial climate chamber, the nozzle mechanism may be composed of a single nozzle. The control unit may control the supply mechanism to switch at least water supply conditions among water and air to the single nozzle so that the at least two operations are switched.

According to this configuration, it is possible to reproduce changes in environmental factors with a single nozzle, and it is possible to prevent water from remaining in the nozzle after switching between operations.

The artificial climate chamber may further include an operation setting unit capable of setting at least one operating condition of the temperature and humidity of the test space, the amount of environmental factors, and the operating time for each of the at least two operations. .

According to this configuration, the conditions of the environmental test can be set in detail.

In the artificial climate chamber, the operation setting unit may be configured to be capable of setting the time change of the amount of the environmental factor for at least one of the rain operation, the snow operation and the fog operation. The control unit may control the supply mechanism based on a time change of the set amount of the environmental factor.

According to this configuration, weather conditions closer to the actual environment can be reproduced by changing the amount of environmental factors (rainfall amount, visibility, snowfall amount) over time.

In the artificial climate chamber, the operation setting unit is configured to automatically set representative values of temperature and humidity of each environment for at least one of the rain operation, the snow operation and the fog operation. good too.

According to this configuration, it is possible to save the trouble of manually inputting the temperature and humidity setting values, so that the environmental test can be performed smoothly.

In the artificial climate chamber, the operation setting unit may be configured to set representative values of temperature and humidity corresponding to the selected region and month by selecting the region and month.

According to this configuration, the temperature and humidity can be easily set simply by selecting the region and the month, so the environmental test can be smoothly performed.

In the artificial climate chamber, the operation setting unit may be configured to be able to set the order in which the at least two operations are performed. The control unit may control the supply mechanism according to the set order.

The artificial climate chamber may further include an operation setting section capable of setting the order of execution of the at least two operations. The control unit may control the supply mechanism according to the set order.

According to this configuration, changes in environmental factors can be reproduced in a desired order, such as the process of rain changing to snow, the appearance of rain falling after snow, and the appearance of haze after rain.

An environmental test method according to one aspect of the present invention comprises a test chamber having a test space in which a test object is placed, a nozzle mechanism for ejecting at least water into the test space, and at least water out of water and air. and a supply mechanism for supplying to the nozzle mechanism. In this environmental test method, at least two of the rainfall operation that reproduces the rain environment in the test space, the snow operation that reproduces the snow environment in the test space, and the fog operation that reproduces the fog environment in the test space are switched. Secondly, at least water supply conditions of water and air from the supply mechanism to the nozzle mechanism are switched.

In this environmental test method, at least two operations among rainfall operation, snowfall operation, and fog operation are switched by switching at least water supply conditions among water and air to the nozzle mechanism. This makes it possible to reproduce in the test space how at least two environmental factors out of rain, snow, and fog change, and to artificially reproduce meteorological conditions close to the actual environment. Therefore, according to this environmental test method, it is possible to evaluate the quality, performance, etc. of the test object under meteorological conditions close to the actual environment.

In the above environmental test method, the order of performing the at least two operations is set in advance, and the at least two operations are switched according to the set order. At least the water supply conditions may be switched.

According to this method, changes in environmental factors can be reproduced in a desired order.

As is clear from the above description, according to the present invention, it is possible to provide an artificial weather chamber and an environmental test method capable of artificially reproducing weather conditions close to those in the actual environment.

It is a figure which shows typically the structure of the artificial climate chamber which concerns on Embodiment 1 of this invention. FIG. 3 is a diagram schematically showing configurations of a water supply mechanism and an air supply mechanism in the artificial climate chamber according to Embodiment 1 of the present invention; 1 is a block diagram schematically showing the configuration of an artificial climate chamber according to Embodiment 1 of the present invention; FIG. FIG. 3 is a schematic diagram showing an operation display unit in the artificial weather chamber according to Embodiment 1 of the present invention; 2 is a flowchart for explaining an environmental test method according to Embodiment 1 of the present invention; It is a schematic diagram for demonstrating the rainfall operation of the environmental test method which concerns on Embodiment 1 of this invention. FIG. 3 is a schematic diagram for explaining fog operation in the environmental test method according to Embodiment 1 of the present invention. It is a schematic diagram for demonstrating the snowfall operation of the environmental test method which concerns on Embodiment 1 of this invention. It is a schematic diagram for demonstrating the water-draining operation|movement of the environmental test method which concerns on Embodiment 1 of this invention. 4 is a graph showing water supply conditions and air supply conditions in each operation of the environmental test method according to Embodiment 1 of the present invention. FIG. 5 is a schematic diagram showing an operation display unit in the artificial weather chamber according to Embodiment 2 of the present invention; FIG. 10 is a diagram schematically showing the configuration of an artificial climate chamber according to Embodiment 3 of the present invention;

The artificial climate chamber and the environmental test method according to the embodiments of the present invention will be described in detail below with reference to the drawings.

(Embodiment 1)
<Climate room>
First, the configuration of an artificial climate chamber 1 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4. FIG. The artificial weather chamber 1 is a device capable of continuously switching between a rainfall environment, a snowfall environment, and a fog environment in the test room 10 (test space S1). As shown in FIGS. 1 to 3, the artificial climate chamber 1 includes a test chamber 10, an air conditioning chamber 20, an air conditioning unit 30, a blower 40, a nozzle mechanism 50, a supply mechanism 110 (water supply mechanism 60 and air It mainly includes a supply mechanism 70 ), an operation setting section 80 and a control section 90 . 1 to 3 show only major components in the artificial climate chamber 1, and the artificial climate chamber 1 may further include other components not shown in these figures. Each component of the artificial climate chamber 1 will be described below.

The test chamber 10 is a housing inside which is formed a test space S1 in which the device under test 100 is arranged. As shown in FIG. 1, the test chamber 10 has, for example, a rectangular parallelepiped shape. It has a wall 13 , left and right side walls (not shown), and a ceiling wall 14 vertically opposed to the bottom wall 11 .

Each wall has, for example, a rectangular shape in a plan view, and is composed of a heat insulating wall. The front wall 12 is provided with an entrance (not shown) into the test chamber 10 and a door (not shown) for opening and closing the entrance. In the test chamber 10, a temperature sensor T1 for measuring the temperature of the test space S1 and a humidity sensor H1 for measuring the humidity of the test space S1 are installed. Although the type of the device under test 100 is not particularly limited, it is, for example, an automobile, etc., and is installed on the floor surface 11A of the bottom wall 11 .

The air-conditioned room 20 is a housing inside which is formed an air-conditioned space S2 in which the air-conditioning unit 30 and the blower 40 are arranged, and is provided on the rear wall 13 of the test room 10 . As shown in FIG. 1, the air-conditioned space S2 is partitioned from the test space S1 by a rear wall 13 . The rear wall 13 is provided with an inlet 22 for sucking the conditioned air A1 from the test space S1 into the conditioned space S2 and an outlet 21 for blowing the conditioned air A1 from the conditioned space S2 to the test space S1. ing. In this embodiment, the suction port 22 is provided at the lower portion of the rear wall 13, and the blowout port 21 is provided at the upper portion of the rear wall 13, but these positions are not particularly limited. Also, the air-conditioned space S2 may be provided independently at a position away from the test space S1.

The air conditioning unit 30 adjusts the temperature and humidity of the conditioned air A1 to temperatures and humidity suitable for reproducing the rainfall environment, the snowfall environment, and the fog environment. As shown in FIG. 1 , the air conditioning section 30 has a refrigerator 31 and a humidifier 32 .

The refrigerator 31 is a device that performs a vapor compression refrigeration cycle, and includes a refrigerant circuit 34 in which refrigerant circulates, a cooler 33 (evaporator) arranged in the refrigerant circuit 34, a compressor, a condenser and an expansion valve, have. In FIG. 1, the compressor, condenser and expansion valve are schematically indicated by a square indicated by reference numeral 35. In FIG.

As shown in FIG. 1, the cooler 33 is arranged above the suction port 22 in the air-conditioned space S2. The conditioned air A1 sucked into the lower part of the conditioned space S2 from the test space S1 through the suction port 22 flows upward toward the blowout port 21, and is temperature-controlled (cooled) by exchanging heat with the refrigerant in the cooler 33. be.

The humidifier 32 humidifies the conditioned air A1 flowing through the conditioned space S2. As shown in FIG. 1, the humidifier 32 in this embodiment includes a container 36 that stores water for generating steam, a humidification heater 38 that heats the water in the container 36 to generate steam, and and a steam supply pipe 37 for supplying the generated steam V1 to the air-conditioned space S2.

The blower 40 is a fan for circulating the conditioned air A1 between the test space S1 and the conditioned space S2. As shown in FIG. 1, the blower 40 is arranged at a position above the cooler 33 in the air-conditioned space S2 so as to face the outlet 21 . The conditioned air A1 is sucked from the test space S1 into the conditioned space S2 by the suction pressure of the blower 40, and after the temperature and humidity are adjusted by the air conditioner 30, is blown out by the blower 40 into the test space S1.

The nozzle mechanism 50 ejects water and air into the test space S1, and is composed of a single nozzle 51 in this embodiment. Nozzle 51 is a two-fluid nozzle, and as shown in FIG. Although only one nozzle 51 is shown in FIG. 1, a plurality of nozzles 51 may be arranged according to the size of the test space S1 and the upper limits of environmental factors (maximum rainfall, minimum visibility, maximum snowfall). may be set.

FIG. 2 shows the configuration of the supply mechanism 110. As shown in FIG. The supply mechanism 110 in this embodiment supplies water and air to the nozzle 51 and has a water supply mechanism 60 and an air supply mechanism 70 .

The water supply mechanism 60 supplies water W1 to the nozzle 51, and includes a water storage tank 61, a water supply pipe 62, a water pump 63, a plurality (three) of pressure control valves 64A, 64B, 64C, It has path switching valves 65A, 65B, 65C, a flow control valve 66, a flow meter 67, and an outlet valve 68.

Water W1 is stored in the water storage tank 61 . The water supply pipe 62 has one end connected to the outflow port 61A of the water storage tank 61 and the other end connected to the water inlet 52A of the nozzle 51 (FIG. 1). As shown in FIG. 2, the water supply pipe 62 branches into a plurality (three) of branch pipes 62A, 62B, and 62C at a portion P1, and the branch pipes 62A to 62C at a portion P2 downstream of the portion P1. 62C joins.

The water pump 63 sends out the water W1 flowing out of the water storage tank 61 toward the nozzle 51 (FIG. 1). The water pump 63 is, for example, a high-pressure pump with a water pressure of about 5 MPa, and is arranged upstream of the portion P1 in the water supply pipe 62 .

The pressure regulating valves 64A-64C adjust the pressure of the water W1 flowing through the water supply pipe 62, and are installed in each of the branch pipes 62A-62C. The pressure regulating valves 64A to 64C have different pressure regulating ranges and different valve diameters, and are used according to rain, snow and fog driving. Specifically, the valve 64A is a fog valve used in fog operation, the valve 64B is a snow valve used in snow operation, and the valve 64C is a rain valve used in rain operation. is. The valve diameter becomes smaller in order of the rain valve 64C, the snow valve 64B, and the fog valve 64A. By adjusting the pressure of the water W1 using the pressure regulating valves 64A to 64C, the diameter of the water droplets ejected from the nozzle 51 can be adjusted according to each of rainfall, snowfall and fog driving.

Path switching valves 65A to 65C are installed downstream of the pressure control valves 64A to 64C, respectively, on the branch pipes 62A to 62C. The path switching valves 65A to 65C are open/close valves, respectively, and by switching the open/closed states of these, the water W1 flows only through the branch pipe 62A (branch pipe for fog) and the water W1 flows through the branch pipe 62B (branch pipe for snowfall). It is possible to switch between a state in which the water W1 flows only through the branch pipe 62C (a rainfall branch pipe).

The flow rate adjustment valve 66 adjusts the flow rate of the water W1 flowing through the water supply pipe 62 and is installed downstream of the portion P2 of the water supply pipe 62 . The flow control valve 66 is, for example, a three-way valve, and is connected to a water return pipe 69 for returning the water W1 to the water storage tank 61 .

The flowmeter 67 is a sensor that measures the flow rate of the water W1 flowing through the water supply pipe 62 and is installed downstream of the flow control valve 66 and upstream of the outlet valve 68 in the water supply pipe 62 . The outlet valve 68 is an opening/closing valve, and has a state in which the supply of the water W1 to the nozzle 51 through the water supply pipe 62 is allowed, and a state in which the supply of the water W1 to the nozzle 51 through the water supply pipe 62 is blocked. and switch.

The air supply mechanism 70 supplies air to the nozzle 51, and includes an air compressor 71, an air supply pipe 72, pressure control valves 73A, 73B, 73C, path switching valves 74A, 74B, 74C, and flow control valves 74A, 74B, 74C. It has a valve 77 , a flow meter 76 and an outlet valve 75 .

The air compressor 71 generates compressed air. The air supply pipe 72 has one end connected to the outlet of the air compressor 71 and the other end connected to the air inlet 52B of the nozzle 51 (FIG. 1). Similarly to the water supply pipe 62, the air supply pipe 72 is branched into a plurality (three) of branch pipes 72A, 72B, and 72C at the portion P3, and is branched at a portion P4 downstream of the portion P3. 72A, 72B, and 72C are merged.

The pressure regulating valves 73A-73C adjust the pressure of the air flowing through the air supply pipe 72, and are installed in each of the branch pipes 72A-72C. The pressure regulating valves 73A to 73C are selectively used according to snowfall operation, fog operation, and water removal operation. Specifically, the valve 73A is a fog valve used in fog operation, the valve 73B is a snowfall valve used in snowfall operation, and the valve 73C is a drain valve used in drain operation. It's a valve.

Path switching valves 74A to 74C are installed in the branch pipes 72A to 72C, respectively, downstream of the pressure control valves 73A to 73C. The path switching valves 74A to 74C are open/close valves, respectively, and by switching the open/closed states of these, the compressed air flows only through the branch pipe 72A (branch pipe for fog) and the branch pipe 72B (branch pipe for snowfall). It is possible to switch between a state in which the compressed air flows only through the branch pipe 72C (a draining branch pipe).

The flow rate adjustment valve 77 adjusts the flow rate of the compressed air flowing through the air supply pipe 72 and is installed downstream of the portion P4 of the air supply pipe 72 . The flowmeter 76 is a sensor that measures the flow rate of compressed air flowing through the air supply pipe 72 , and is installed downstream of the flow control valve 77 and upstream of the outlet valve 75 in the air supply pipe 72 . The outlet valve 75 is an opening/closing valve, and has a state in which the supply of compressed air to the nozzle 51 through the air supply pipe 72 is allowed and a state in which the supply of compressed air to the nozzle 51 through the air supply pipe 72 is blocked. and switch.

The water supply pipe 62 and the air supply pipe 72 are connected to each other by a connection pipe 78 . Specifically, as shown in FIG. 2, one end of the connection pipe 78 is connected to a portion P5 downstream of the outlet valve 68 in the water supply pipe 62, and the other end of the connection pipe 78 is connected to an air supply pipe. 72 is connected to a portion P6 on the downstream side of the outlet valve 75 . An on-off valve 79 is installed on the connection pipe 78 .

FIG. 3 is a block diagram schematically showing the functional configuration of the artificial climate chamber 1. As shown in FIG. The operation setting unit 80 can set the operating conditions such as the temperature and humidity of the test space S1, the amount of environmental factors (rainfall amount, snowfall amount, visibility), and the operating time for each of rainfall operation, snowfall operation, and fog operation. At the same time, it is possible to set the order in which rain operation, snow operation and fog operation are to be performed, and it is composed of an input device such as a touch panel, for example.

FIG. 4 shows an example of a touch panel screen in the operation setting section 80. As shown in FIG. As shown in FIG. 4, for each environmental factor of rain, snow and fog, areas are provided in which temperature and humidity, amount of environmental factor (rainfall amount, snowfall amount, visibility), order and operation time can be set. Data of each set operating condition is transmitted to the control unit 90 (FIG. 3).

The operation setting unit 80 is configured to automatically set a representative value of the temperature and humidity of each environment as an initial value (default value) for each of the rain driving, the snow falling driving, and the fog driving. As an example, 20°C and 95% RH are automatically set for rain operation, -20°C and 50% RH for snow operation, and 20°C and 98% RH for fog operation. set. Note that this automatic setting function is not essential in the artificial climate chamber of the present invention and may be omitted.

Further, the operation setting unit 80 is configured such that by selecting a region (Japan and foreign countries) and a month, representative values of temperature and humidity corresponding to the selected region and month are set. For example, data of representative values of temperature and humidity corresponding to January in Osaka are stored in advance, and the temperature and humidity are automatically set only by the user selecting "January in Osaka". This function is also not essential in the artificial climate chamber of the present invention and may be omitted.

The control unit 90 is a controller that controls each operation of the artificial climate chamber 1, and is configured by a central processing unit (CPU). The control unit 90 operates as a water supply control unit 91, an air supply control unit 92, and an air conditioning control unit 93 by executing various programs stored in a storage unit 94 such as a DRAM (Dynamic Random Access Memory). The specific contents of these controls will be described below.

First, the rainfall amount, the snowfall amount, and the visibility data set by the operation setting unit 80 are input to the water supply control unit 91 . On the other hand, a main storage device 95 such as a ROM (Read Only Memory) stores conditions of the pressure and flow rate of the water W1 supplied to the nozzle 51 (water supply conditions) and the amount of each environmental factor (rainfall amount, snowfall amount and visibility). ) is stored. Here, the snowfall amount is correlated with the water supply condition for each temperature, and the visibility is correlated with the water supply condition for each temperature and humidity.

The water supply control unit 91 refers to the correlation table to determine the water supply condition corresponding to the set amount of each environmental factor (rainfall amount, snowfall amount, or visibility). Then, the water supply control unit 91 controls the opening degrees of the pressure adjustment valves 64A to 64C and the flow rate adjustment valve 66 so that the water W1 is supplied to the nozzle 51 under the determined water supply conditions. Controls the opening and closing of 65A-65C. At this time, the opening degree of the flow control valve 66 is feedback-controlled based on the measured value input from the flow meter 67 to the controller 90 . The water supply control section 91 controls the water supply mechanism 60 according to the order set by the operation setting section 80 .

The snowfall amount and visibility data set by the operation setting unit 80 are also input to the air supply control unit 92 . The correlation table also includes information indicating the correlation between the pressure and flow rate conditions (air supply conditions) of the air supplied to the nozzle 51 and the amount of each environmental factor (snowfall amount and visibility). In the same manner as described above, the snowfall amount is correlated with the air supply condition for each temperature, and the visibility is correlated with the air supply condition for each temperature and humidity.

The air supply control unit 92 refers to the correlation table to determine the air supply condition corresponding to the amount of set environmental factor (amount of snowfall or visibility). Then, the air supply control unit 92 controls the opening degrees of the pressure adjustment valves 73A to 73C and the flow rate adjustment valve 77 so that the compressed air is supplied to the nozzle 51 under the determined air supply conditions, and the path switching valve Controls the opening and closing of 74A-74C. At this time, as in the case of the water supply control section 91 , the opening of the flow control valve 77 is feedback-controlled based on the measured value input from the flowmeter 76 to the control section 90 . The air supply control section 92 controls the air supply mechanism 70 according to the order set by the operation setting section 80 .

The air conditioning control unit 93 controls the output of the refrigerator 31 based on the temperature set by the operation setting unit 80 and the temperature input from the temperature sensor T1. Specifically, the refrigerant circulation amount in the refrigerator 31 is controlled so that the actual temperature of the test space S1 measured by the temperature sensor T1 approaches the set temperature.

The air conditioning control unit 93 also controls the output of the humidifier 32 based on the humidity set by the operation setting unit 80 and the humidity input from the humidity sensor H1. Specifically, the output of the humidification heater 38 is controlled so that the actual humidity in the test space S1 measured by the humidity sensor H1 approaches the set humidity.

The control unit 90 controls the water supply so that the rain operation that reproduces the rain environment in the test space S1, the snow operation that reproduces the snow environment in the test space S1, and the fog operation that reproduces the fog environment in the test space S1 are continuously switched. The mechanism 60 and the air supply mechanism 70 are controlled to switch the conditions for supplying water and air to the nozzle 51 . The contents of this control will be specifically described below in the environmental test method according to the present embodiment.

<Environmental test method>
Next, the environmental test method according to this embodiment will be described according to the flowchart shown in FIG. This environmental test method is a method for evaluating the quality and various performances of the device under test 100 using the artificial climate chamber 1, and will be described as an example of a case in which the rainfall operation, the fog operation, and the snowfall operation are successively switched in order. do.

FIG. 6 shows the opening/closing state of the valve during rain operation, FIG. 7 shows the opening/closing state of the valve during fog operation, FIG. 8 shows the opening/closing state of the valve during snow operation, and FIG. The open/closed state of the valve is shown. In FIGS. 6 to 9, the white valves are open and the black valves are closed. FIG. 10 is a graph showing water supply conditions (water pressure, water flow rate) and air supply conditions (air pressure, air flow rate) to the nozzle 51 in each operation. The pressure, the flow rate of water W1 supplied to the nozzle 51, the pressure of air supplied to the nozzle 51, and the flow rate of air supplied to the nozzle 51 are shown, respectively.

First, as shown in FIG. 1, the device under test 100 is installed in the test chamber 10 (step S10). In this step S10, the test object 100 such as an automobile is put into the test space S1 through an entrance (not shown) provided on the front wall 12 of the test chamber 10. FIG.

Next, the operation mode of the artificial climate chamber 1 is selected, and the operation conditions for each operation mode are set (step S20). Specifically, as shown in FIG. 4, on the touch panel screen of the operation setting unit 80, set values of temperature and humidity (° C., % RH), rainfall amount (mm/h), visibility (m) in each operation mode , the amount of snowfall (mm/h), the order of executing each operation, and the operation time (h) of each mode are set. In this embodiment, the order of execution is set such that the rain operation is first, the fog operation is second, and the snow operation is third.

When the operation of the artificial weather chamber 1 is started, the rain operation is first started (step S30). In this step S30, the temperature and humidity of the test space S1 are controlled by the air conditioning unit 30 to set values for rainfall operation (for example, 20° C. and 95% RH), and as shown in FIG. Outlet valve 75 is closed and all other valves are open. As a result, the water W1 flowing out from the water storage tank 61 is supplied to the nozzle 51 through the path including the rainfall branch pipe 62C, as indicated by the dashed arrow in FIG. A portion of the water W1 flows into the connection pipe 78 from the portion P5, flows into the air supply pipe 72 from the portion P6, and is then supplied to the nozzle 51. As shown in FIG. The purpose of opening the opening/closing valve 79 is to secure the amount of rainfall, but the opening/closing valve 79 may be closed.

As shown in FIG. 10, the pressure of the water W1 supplied to the nozzle 51 is controlled to PW1 by a pressure regulating valve 64C (rainfall valve), and the flow rate of the water W1 supplied to the nozzle 51 is controlled by the flow regulating valve 66 is controlled to VW1. It should be noted that the values of the water pressure PW1 and the water flow rate VW1 are values correlated with the set values of rainfall.

As a result, the water W1 is ejected from the nozzle 51 toward the test space S1 whose temperature and humidity are controlled, and the water W1 drops toward the floor surface 11A, thereby reproducing the rain environment in the test space S1. Then, when the set operating time has passed (step S40, YES), the rainfall operation is continuously switched to the fog operation as follows (step S50).

Specifically, the air conditioning unit 30 controls the temperature and humidity of the test space S1 to set values for fog operation (for example, 20° C. and 98% RH) (increases the output of the humidifier 32), and the open/closed state of the valve is 7 (the path switching valves 65B, 65C, the outlet valve 75 and the on-off valve 79 are closed and all the other valves are open), and the opening degree of the flow control valve 66 is changed to the state shown in FIG. narrowed down over time.

As a result, the water W1 flowing out of the water storage tank 61 is supplied to the nozzle 51 through the path including the fog branch pipe 62A, as indicated by the dashed arrow in FIG. As a result, as shown in FIG. 10, the pressure of the water W1 supplied to the nozzle 51 is adjusted by the pressure adjustment valve 64A (fog valve), thereby switching from PW1 to PW2, which is higher than PW1. Also, the flow rate of the water W1 supplied to the nozzle 51 is adjusted by the flow rate adjustment valve 66, thereby switching from VW1 to VW2, which is smaller than VW1. It should be noted that the water pressure PW2 and the water flow rate VW2 are values correlated with the set value of the visibility.

As a result, the atomized water W1 is sprayed from the nozzle 51 toward the test space S1 whose temperature and humidity are controlled, and the fine particles of the water W1 float in the test space S1 to reproduce a foggy environment. Then, when the set operating time has passed (step S60, YES), the fog operation is continuously switched to the snowfall operation (step S70).

Specifically, the air conditioning unit 30 controls the temperature and humidity of the test space S1 to set values for snowfall operation (−20° C., 50% RH), and the opening/closing state of the valve changes from the state shown in FIG. 7 to the state shown in FIG. The path switching valves 65A, 65C, 74A, 74C and the open/close valve 79 are closed and all other valves are open). As a result, the water W1 flowing out of the water storage tank 61 is supplied to the nozzle 51 through the path including the snowfall branch pipe 62B, as indicated by the dashed-line arrow in FIG. As shown, the compressed air generated by the air compressor 71 is supplied to the nozzle 51 through a path including the snowfall branch pipe 72B. In the snowfall operation, it is necessary to atomize the water W1 to freeze the water W1 in the test space S1, so both the water W1 and the compressed air are supplied to the nozzles 51 .

As a result, as shown in FIG. 10, the pressure of the water W1 supplied to the nozzle 51 is adjusted by the pressure regulating valve 64B (snowfall valve), thereby switching to PW3, which is larger than PW1 and smaller than PW2. . Also, the flow rate of the water W1 supplied to the nozzle 51 is maintained at VW2. On the other hand, the pressure of the air supplied to the nozzle 51 is controlled to PA1 by the pressure control valve 73B, and the flow rate of the air is controlled to VA1 by the flow control valve 77. FIG.

As a result, the atomized water W1 is sprayed from the nozzle 51 toward the subzero test space S1, and the water W1 freezes in the test space S1 to form artificial snow, thereby reproducing a snowfall environment in the test space S1. be. Then, when the set operation time has elapsed (step S80, YES), the snowfall operation is switched to the draining operation (step S90).

Specifically, the opening/closing state of the valves is switched from the state shown in FIG. 8 to the state shown in FIG. 9 (the outlet valve 68 and the path switching valves 74A and 74B are closed and all other valves are open). As a result, the compressed air generated by the air compressor 71 is supplied to the nozzle 51 through a path including the drain branch pipe 72C. At this time, the pressure of the air supplied to the nozzle 51 is adjusted to PA2, which is higher than PA1, by the pressure adjustment valve 73C. A part of the compressed air flows into the connecting pipe 78 from the portion P6, flows into the water supply pipe 62 from the portion P5, and is then supplied to the nozzle 51. This can prevent the water W1 remaining in the nozzle 51 from freezing. As described above, the environmental test method according to the present embodiment is carried out. In an artificial climate chamber in which the temperature inside the test chamber 10 is not lowered below freezing, the circuit dedicated to draining water may be omitted and the draining operation may not be performed.

As described above, in the present embodiment, the nozzle mechanism 50 (single nozzle 51) from the supply mechanism 110 (the water supply mechanism 60 and the air supply mechanism 70) is arranged so that the rain operation, the snow operation, and the fog operation are continuously switched. Switch the supply conditions of water W1 and air to . This makes it possible to reproduce the state in which the environmental factors such as rain, snow, and fog continuously change in the test space S1, so that the environmental test can be performed under weather conditions close to the actual environment.

(Embodiment 2)
Next, an artificial weather chamber according to Embodiment 2 of the present invention will be described. The artificial weather chamber according to the second embodiment has basically the same configuration as the artificial weather chamber 1 according to the first embodiment, and has the same effects. It is different from the artificial weather chamber 1 according to the first embodiment in that it is possible to set the time change of (rainfall amount, visibility, snowfall amount). Only points different from the first embodiment will be described below.

FIG. 11 shows an example of the touch panel screen of the operation setting section 80 according to the second embodiment. The operation display unit 80 in Embodiment 2 is configured to be able to set the time change of the amount of the environmental factors (rainfall amount, visibility, and snowfall amount) for each of rainfall operation, fog operation, and snowfall operation. That is, the operation display unit 80 according to the present embodiment can display the non-steady setting screen shown in FIG. 11 in addition to the steady setting screen shown in FIG. Specifically, by touching the "unsteady setting" portion displayed on the screen in FIG. 4, the setting screen in FIG. 11 can be displayed.

As shown in FIG. 11, on the non-stationary setting screen, it is possible to set the initial value, the end value, and the time for the amount of each environmental factor (rainfall amount, visibility, and snowfall amount). Specifically, in the example of FIG. 11, the rainfall increases from 0 to 100 mm/h for 0.1 hours, the rainfall is maintained at 100 mm/h for 0.5 hours, and the rainfall for 0.1 hours The conditions for rain operation can be programmed such that the rainfall decreases from 100 to 50 mm/h during this period, and then from 50 to 0 mm/h during 0.5 hours. Also for fog driving, the visibility increased from 0 to 100 m during 1 hour, the visibility was maintained at 100 m during 1 hour, the visibility increased from 100 to 500 m during 1 hour, and then during 2 hours. Operating conditions can be programmed to reduce visibility from 500 to 0 meters. Regarding the snowfall operation, the amount of snowfall increased from 0 to 30mm/h in 0.5 hours, the amount of snowfall increased from 30 to 40mm/h in 1 hour, and the amount of snowfall increased in 0.5 hours. The operating conditions can be programmed such that the is reduced from 40 to 30 mm/h, and then the snowfall is reduced from 30 to 0 mm/h over the next 0.1 hour. Then, the control unit 90 controls the water supply mechanism 60 and the air supply mechanism 70 in the same manner as in the first embodiment based on the temporal change in the amount of the environmental factor set by the operation setting unit 80 .

According to the artificial weather chamber according to this embodiment, by changing the amount of each environmental factor (rainfall amount, visibility, snowfall amount) over time, weather conditions closer to the actual environment can be reproduced in the test space S1. can. The manner in which each environmental factor is changed is not particularly limited. For example, it may be changed linearly with time or may be changed stepwise with time.

(Embodiment 3)
Next, an artificial climate chamber 1A according to Embodiment 3 of the present invention will be described with reference to FIG. The artificial weather chamber 1A according to Embodiment 3 basically has the same configuration and effects as the artificial weather chamber 1 according to Embodiment 1, except that the nozzle mechanism 50 includes a plurality of nozzles 53, It is different from the artificial weather chamber 1 according to the first embodiment in that it is composed of 54 and 55 . Only points different from the first embodiment will be described below.

FIG. 12 shows configurations of a nozzle mechanism 50, a water supply mechanism 60, and an air supply mechanism 70 in an artificial climate chamber 1A according to the third embodiment. In addition, in FIG. 12, the same reference numerals are assigned to the components described in the first embodiment, and the description thereof is omitted.

As shown in FIG. 12, the nozzle mechanism 50 is composed of a rain nozzle 53, a snow nozzle 54 and a fog nozzle 55. As shown in FIG. A plurality of nozzle mechanisms 50 (a set of rain nozzles 53 , snow nozzles 54 and fog nozzles 55 ) are installed on the ceiling wall 14 of the test chamber 10 .

The water supply mechanism 60 has three branch pipes 62A to 62C as in the first embodiment. 53 water inlets are connected respectively. The air supply mechanism 70 also has two branch pipes 72A and 72B, and the branch pipes 72A and 72B are connected to the fog nozzle 55 and the snow nozzle 54, respectively, without merging.

As described above, the artificial weather chamber 1A according to the third embodiment includes dedicated nozzles corresponding to rain, snow, and fog, respectively. By switching, the operation can be continuously switched in the order of rainy operation, foggy operation, and snowy operation. In addition, the air supply mechanism 70 may further have a branch pipe connected to the water inlet of the rain nozzle 53 . In this case, by supplying compressed air from the air compressor 71 to the rain nozzle 53 through the branch pipe, the rain nozzle 53 can be drained.

(Other embodiments)
Other embodiments of the invention will now be described.

In the first embodiment described above, the case where the operation is continuously switched in the order of the rain operation, the fog operation, and the snow operation has been described as an example, but the order of performing each operation is not limited to this. For example, the order of rain driving, snow driving and fog driving may be used, the order of fog driving, rain driving and snow driving may be used, the order of fog driving, snow driving and rain driving may be used, and the order of snow driving, rain driving, and so on may be used. The order of fog driving may be used, or the order of snow driving, fog driving, and rain driving may be used. Moreover, the present invention is not limited to the case where the rain operation, the fog operation, and the snow operation are each performed once, and at least one of these operations may be performed twice or more. Moreover, it is not limited to switching between a plurality of operations continuously, and each operation may be performed in order with a time interval.

In the above-described first embodiment, the case where all of the rain operation, the fog operation, and the snow operation are performed has been described, but only two of these operations may be performed. That is, it may be possible to continuously switch only between the raining operation and the foggy operation, or it may be possible to continuously switch only between the raining operation and the snowing operation. and fog operation only. Further, the switching between these two operations is not limited to being performed continuously, and each operation may be performed in order with a time interval.

Here, as shown in FIG. 10, both rainfall operation and fog operation can be performed by supplying only water W1 to the nozzle 51 without supplying compressed air. Therefore, in a climate chamber that can be switched only between rainfall operation and fog operation, the nozzle 51 may be a one-fluid nozzle and the supply mechanism 110 may have only the water supply mechanism 60 (the air supply mechanism 70 ).

In the first embodiment, a touch panel was described as an example of the operation setting unit 80, but the operation setting unit 80 is not limited to this. The screen may be displayed on a personal computer display.

In the first embodiment described above, the case where compressed air is not supplied to the nozzles 51 during fog operation has been described, but compressed air may be supplied to the nozzles 51 . In this case, as a change from the valve opening/closing state shown in FIG. 7, the path switching valves 74B and 74C are closed and the outlet valve 75 is opened. As a result, the water droplets sprayed from the nozzle 51 are made more atomized, making it easier to reproduce the foggy environment.

In Embodiment 1 above, the case where the water supply mechanism 60 is controlled using a table showing the correlation between the water supply condition to the nozzles 51 and the visibility during fog driving has been described, but the present invention is not limited to this. For example, a visibility meter may be arranged to measure the visibility in the test space S1, and the water supply mechanism 60 may be feedback-controlled so that the measurement result approaches the set value of the visibility.

The water supply mechanism 60 is not limited to the configuration in which the fog circuit, the snowfall circuit, and the rainfall circuit are separated, respectively. are not limited to those configured separately. For example, the water supply mechanism 60 may be configured to switch fog operation, snowfall operation, and rainfall operation using one circuit, or may be configured to switch these operations using two circuits. In addition, the air supply mechanism 70 may be configured to switch between fog operation, snowfall operation, and drain operation using one circuit, or may be configured to switch these operations using two circuits.

It should be understood that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

1, 1A Artificial climate chamber 10 Test chamber 50 Nozzle mechanism 51 Nozzle 60 Water supply mechanism 70 Air supply mechanism 80 Operation setting unit 90 Control unit 100 Test object 110 Supply mechanism S1 Test space W1 Water

Claims (16)

a test room having a test space in which the object to be tested is arranged;
a nozzle mechanism for ejecting water and air into the test space;
a water supply mechanism that supplies water to the nozzle mechanism so that the pressure and flow rate of water can be adjusted;
an air supply mechanism that supplies air to the nozzle mechanism so as to be able to adjust the pressure and flow rate of the air;
a control unit that controls the water supply mechanism and the air supply mechanism ,
The control unit is configured to switch between at least two operations out of a rain operation that reproduces a rain environment in the test space, a snow operation that reproduces a snow environment in the test space, and a fog operation that reproduces a fog environment in the test space. , controlling the water supply mechanism to adjust the pressure and flow rate of water supplied to the nozzle mechanism, and controlling the air supply mechanism to adjust the pressure and flow rate of air supplied to the nozzle mechanism ; Artificial weather chamber. When switching between the rainfall operation and the fog operation, the control unit controls the pressure of the water supplied to the nozzle mechanism so that the water pressure in the fog operation is higher than the water pressure in the rainfall operation. 2. The climate chamber of claim 1, which regulates the When switching between the fog operation and the snow falling operation, the control unit controls the pressure of the water supplied to the nozzle mechanism so that the pressure of the water during the snow falling operation is lower than the pressure of the water during the fog driving. 3. The climate chamber according to claim 1 or 2, which adjusts the When switching between the raining operation and the snowing operation, the control unit controls the pressure of the water supplied to the nozzle mechanism so that the pressure of the water during the snowing operation is higher than the pressure of the water during the raining operation. The artificial climate chamber according to any one of claims 1 to 3, which adjusts the The nozzle mechanism is composed of a single nozzle,
The control unit controls the water supply mechanism to adjust the pressure and flow rate of water supplied to the single nozzle and controls the air supply mechanism so that the at least two operations are switched. The climate chamber according to any one of claims 1 to 4 , wherein the pressure and flow rate of air supplied to said single nozzle are adjusted . Any one of claims 1 to 5 , further comprising an operation setting unit capable of setting at least one operating condition of the temperature and humidity of the test space, the amount of environmental factors, and the operating time for each of the at least two operations. The artificial climate chamber according to item 1 . The operation setting unit is configured to be capable of setting a temporal change in the amount of the environmental factor for at least one of the rain operation, the snow operation, and the fog operation,
7. The artificial climate chamber according to claim 6 , wherein said control unit controls said water supply mechanism and said air supply mechanism based on a time change in the set amount of said environmental factor. 8. The operation setting unit is configured to automatically set representative values of temperature and humidity of each environment for at least one of the rain operation, the snow operation and the fog operation. The artificial climate chamber described in . 9. The operation setting unit according to any one of claims 6 to 8 , wherein by selecting a region and a month, a representative value of temperature and humidity corresponding to the selected region and month is set. The artificial climate chamber described in . The operation setting unit is configured to be able to set the order of executing the at least two operations,
The artificial climate chamber according to any one of claims 6 to 9 , wherein said controller controls said water supply mechanism and said air supply mechanism according to said set order. further comprising an operation setting unit capable of setting the order of performing the at least two operations,
The artificial climate chamber according to any one of claims 1 to 5 , wherein said controller controls said water supply mechanism and said air supply mechanism according to said set order. A test chamber in which a test space in which an object to be tested is placed is formed, a nozzle mechanism for ejecting water and air into the test space, and a water supply for supplying water to the nozzle mechanism so as to be able to adjust water pressure and flow rate A method of performing an environmental test on the device under test using an artificial climate chamber equipped with a mechanism and an air supply mechanism that supplies air to the nozzle mechanism so that the pressure and flow rate of the air can be adjusted ,
The water supply mechanism switches between at least two operations of a rain operation that reproduces a rain environment in the test space, a snow operation that reproduces a snow environment in the test space, and a fog operation that reproduces a fog environment in the test space. and adjusting the pressure and flow rate of water supplied from the air supply mechanism to the nozzle mechanism, and adjusting the pressure and flow rate of air supplied to the nozzle mechanism from the air supply mechanism . When switching between the rainfall operation and the fog operation, the water pressure supplied from the water supply mechanism to the nozzle mechanism is such that the water pressure in the fog operation is higher than the water pressure in the rainfall operation. 13. The environmental test method according to claim 12, wherein the is adjusted. When switching between the fog operation and the snowfall operation, the water pressure supplied from the water supply mechanism to the nozzle mechanism is such that the water pressure in the snowfall operation is lower than the water pressure in the fog operation. The environmental test method according to claim 12 or 13, wherein the is adjusted. When switching between the rainfall operation and the snowfall operation, the water pressure supplied from the water supply mechanism to the nozzle mechanism is such that the water pressure during the snowfall operation is higher than the water pressure during the rainfall operation. Adjust the environmental test method according to any one of claims 12 to 14. presetting the order of performing the at least two operations;
The pressure and flow rate of water supplied from the water supply mechanism to the nozzle mechanism are adjusted so that the at least two operations are switched according to the set order, and the water is supplied from the air supply mechanism to the nozzle mechanism. The environmental test method according to any one of claims 12 to 15 , wherein the air pressure and flow rate are adjusted .

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