JP2020148529A - Test room pressure control device - Google Patents

Abstract

To provide a test room pressure control device capable of delivering superior energy saving and environmental performance and curbing a cost.SOLUTION: In a test room pressure control device, a room pressure regulation container 7 is installed inside an environmental test room 2 where a predetermined temperature environment can be created with an air conditioner 3. The room pressure regulation container 7 has an opening section 7a communicated with the interior of the environment test room 2. Pressure inside the room pressure regulation chamber 7 can be regulated with a pressure regulation section 9 capable of regulating an amount of air supplied through a second passage 42 and an amount of air discharged through an exhaust duct 8. A pressure change in the room pressure regulation container 7 is propagated to the interior of the environmental test room 2 through the opening section 7a and the pressure inside the environmental test room 2 and inside the room pressure regulation container 7 is homogenized. Because the air discharged for regulating the pressure is the one inside the room pressure regulation container 7, the test room pressure control device can prevent the air-conditioned air from being uselessly discharged for regulating the pressure. Also, the test room pressure control device hardly requires air used for regulating pressure to be air-conditioned.SELECTED DRAWING: Figure 1

Description

The present invention has an environmental test chamber capable of forming a predetermined temperature environment, and is a test chamber pressure control device capable of controlling the pressure in the environmental test chamber when testing a test object placed in the environmental test chamber. Regarding.

Conventionally, a load test may be performed on an internal combustion engine, a vehicle having the internal combustion engine, a vehicle having the same, a prime mover, or the like, assuming use in various pressure environments such as a low pressure environment such as a highland as well as a flat ground. A laboratory pressure controller is utilized for such tests. The test room pressure control device includes an environmental test room in which the test piece can be installed, an air conditioner that can adjust the air temperature in the environmental test room to form a predetermined temperature environment in the environmental test room, and an environmental test room. An external air supply duct for supplying external air, an exhaust gas exhaust duct for discharging air containing exhaust gas in the environmental test chamber to the outside, and a pressure adjusting means for adjusting the pressure in the environmental test chamber. , Those equipped with a pressure sensor for detecting the pressure in the environmental test chamber are known (see, for example, Patent Document 1 and the like). In the case of Patent Document 1, the pressure adjusting means is a decompression blower for sucking and discharging the exhaust gas and the indoor air discharged from the test object into the main ventilation pipe, that is, the exhaust gas exhaust duct in the environmental test chamber. In addition to the ventilation pipe that discharges the exhaust gas discharged from the test object, it is composed of a pressure regulating valve for adjusting the amount of indoor air sucked into the exhaust gas exhaust duct (that is, the amount of air discharged). .. In this test room pressure control device, the operation of the decompression blower and pressure regulating valve is controlled according to the pressure in the environmental test room detected by the pressure sensor, and the amount of air discharged from the environmental test room is adjusted to control the environment. It is possible to form a desired pressure environment in the test chamber.

Special Fair 4-68578 Gazette

However, in the above-mentioned test room pressure control device, the pressure in the environmental test room is adjusted by discharging the air in the environmental test room whose temperature is controlled by the air conditioner. Therefore, when the environmental test room is set to the air condition for realizing a low temperature environment, for example, in the air conditioner, the air circulating in the environmental test room and the external air required for the test of the test object (for example, the intake air of the test object). Not only the air) but also the temperature of the external air used for pressure control in the environmental test room will be controlled. Therefore, of the temperature-controlled air, the external air used for pressure control is wasted, and the air-conditioning load in the air conditioner increases accordingly, making it possible to handle a high air-conditioning load. It becomes necessary to prepare a relatively large (high performance) air conditioner, which may be disadvantageous in terms of cost such as running cost. Especially in an air conditioner that creates a low temperature environment in an environmental test room, a very large amount of dehumidification must be performed from room temperature air due to the low dew point temperature of the indoor low temperature air, and enormous refrigeration energy and desiccant moisture absorbing material are regenerated. Energy is needed. In addition, if the air conditioning load is high, it is inevitable that energy will be consumed accordingly, and there is a risk that sufficiently good results cannot be obtained in terms of energy saving performance and environmental performance (CO ₂ emissions, etc.).

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a laboratory pressure control device capable of exhibiting excellent energy-saving performance and environmental performance and suppressing costs. is there.

Hereinafter, each means suitable for solving the above object will be described in terms of terms. In addition, the action and effect peculiar to the corresponding means will be added as necessary.

Means 1. An air conditioner that can adjust the temperature of the air in the installed room,
It is equipped with an environmental test room in which the test piece is installed and a predetermined temperature environment can be formed by the air conditioner installed inside.
A test chamber pressure control device capable of controlling the pressure in the environmental test chamber when the test subject is installed in the environmental test chamber and then tested.
A first passage having a discharge port located in the environmental test chamber and being configured to be able to supply external air discharged from the discharge port to the air conditioner and indirectly connected to the air conditioner, and the first passage. An external air supply duct that is branched into a second passage different from the passage and through which external air supplied from the outside to the environmental test chamber passes.
A dehumidifier arranged upstream of the first passage and the branch portion of the second passage in the external air supply duct to dehumidify the external air supplied from the outside to the environmental test chamber.
A chamber pressure adjusting container arranged in the environmental test chamber, connected to the second passage, and provided with an internal space.
An exhaust duct that is connected to the chamber pressure adjusting container and exhausts the air in the chamber pressure adjusting container to the outside.
An air supply means that sends air to the air conditioner side through the first passage and also applies dynamic pressure to the air to send air through the second passage into the chamber pressure adjusting container.
An exhaust means for exhausting the air in the chamber pressure adjusting container to the outside through the exhaust duct,
The air supply amount adjusting means for adjusting the amount of air supplied to the inside of the room pressure adjusting container through the second passage, and the amount of air discharged from the inside of the room pressure adjusting container through the exhaust duct. It includes at least one of the exhaust gas adjusting means for adjusting, and has a pressure adjusting means capable of adjusting the pressure in the environmental test chamber.
The chamber pressure adjusting container is provided with an opening communicating with the indoor space of the environmental test chamber, and the internal space of the chamber pressure adjusting container and the indoor space of the environmental test chamber are separated from each other except for the opening. A laboratory pressure control device characterized in that it is configured to be in a state.

In other words, "the internal space of the chamber pressure adjusting container and the indoor space of the environmental test chamber are separated from each other except for the opening" is, in other words, "the chamber pressure adjusting container. The only place that directly communicates from the internal space to the indoor space of the environmental test room (without passing through the first passage or the second passage) is the opening. " Further, the "air supply amount adjusting means" can be configured by a variable flow rate air supply fan, a flow rate adjusting valve, or the like. In this case, the air supply fan may also serve as the "air supply means". Further, the "displacement adjusting means" can be configured by a variable flow rate exhaust fan, a flow rate adjusting valve, or the like. In this case, the exhaust fan may also serve as an "exhaust means".

According to the above means 1, the air supplied from the outside to the environmental test chamber (air passing through the external air supply duct) is divided into the first passage and the second passage. Then, the air passing through the first passage is discharged to the environmental test chamber and then supplied to the air conditioner side by the air supply means, and the air passing through the second passage is supplied into the chamber pressure adjusting container. The temperature of the air supplied to the air conditioner side is controlled by the air conditioner. As a result, a predetermined temperature environment is formed in the environmental test chamber. On the other hand, the air supplied into the chamber pressure adjusting container through the second passage is discharged to the outside through the exhaust duct by the exhaust means. Then, the pressure in the chamber pressure adjusting container is adjusted by adjusting the supply amount of air through the second passage and / or the discharge amount of air through the exhaust duct by the pressure adjusting means. Since the pressure change that occurs at this time is immediately propagated to the environmental test chamber through the opening provided in the chamber pressure adjusting container, the pressure in the environmental test chamber is quickly equal to the pressure in the chamber pressure adjusting container. Become uniform (equal). Therefore, it is possible to adjust the pressure in the environmental test chamber only by adjusting the external air supply amount and the exhaust amount in the chamber pressure adjusting container.

Further, according to the above means 1, the air (the former air) supplied to the environmental test chamber (air conditioner side) through the first passage and the air supplied into the chamber pressure adjusting container through the second passage. The air (the latter air) is dehumidified by a common dehumidifier when the set temperature in the environmental test chamber is set to a low temperature. Therefore, although the dehumidifying energy is consumed, the absolute humidity of both airs can be more reliably made almost equal before the energy for adjusting the temperature of the air dried at room temperature to a lower temperature is consumed. In addition, since the temperature of the former air is regulated by the air conditioner while the temperature of the latter air is not regulated in particular, a sufficient temperature difference can be generated between the two airs. Therefore, in general, air having almost the same absolute humidity but having a temperature difference does not easily become uniform (difficult to mix) immediately after being mixed. Therefore, the air in the environmental test chamber and the inside of the chamber pressure adjusting container have a property. It is possible to make it difficult for the air to become uniform (difficult to mix). As a result, it is possible to effectively prevent the temperature-controlled air in the environmental test chamber from mixing with the air in the room pressure adjusting container.

Then, since it is possible to prevent the temperature-controlled air from mixing with the air in the room pressure adjusting container, the air discharged from the room pressure adjusting container is basically adjusted to the room pressure through the second passage. It can be the air supplied into the container, that is, the air whose temperature is not particularly controlled. As a result, it is not necessary to wastefully discharge the temperature-controlled air for pressure control, which does not require any temperature-controlled air, and in the air conditioner, the air entering and exiting the room pressure control container, that is, the environmental test. There is almost no need to control the temperature of the air used to control the pressure in the room. As a result, the air conditioning load in the air conditioner can be significantly reduced, and excellent energy saving performance and environmental performance can be exhibited. Further, by reducing the air conditioning load, a relatively small air conditioner (not so high performance) is sufficient, and costs such as running costs can be effectively suppressed.

The air conditioner also regulates the temperature of the air dehumidified by the dehumidifier. Since the outside air that has not been dehumidified usually contains a large amount of water, the air conditioner installed in the room cools and dehumidifies the air in the environmental test room, and when the air cools the interior of the room, the external air supply duct A large amount of water carried in by the air flowing in from the first passage of the above condenses indoors and freezes repeatedly, causing frost and freezing to occur and grow, and it is not possible to form an environment with a predetermined humidity at low temperature. Even if the first passage and the air conditioner are connected by a duct or the like, the air conditioning load in the air conditioner may increase when the air temperature is controlled in this way, and the cost may not be sufficiently suppressed. .. In this respect, according to the above means 1, since the temperature of the dehumidified air is adjusted, the air conditioning load can be reduced more effectively, and the cost suppressing effect can be further enhanced.

Further, according to the above means 1, the air supplied to the environmental test chamber (air conditioner side) and the chamber pressure adjusting container is dehumidified by the dehumidifier. Therefore, when the environmental test chamber is set to a low temperature environment, It is possible to more reliably prevent the occurrence of dew condensation in the environmental test room and the container for adjusting the room pressure. In addition, the air conditioner does not have to be covered with a heat insulating material in order to prevent dew condensation on the low temperature surface that has been transferred from the cooling portion built into the air conditioner, and it has excellent rust prevention performance as a constituent material of the air conditioner. There is no need to use special materials. Therefore, cost reduction can be achieved more effectively.

Means 2. The test chamber pressure control device according to means 1, wherein the opening is provided in the lower portion of the chamber pressure adjusting container and is opened downward.

According to the above means 2, when the environmental test chamber is set to a low temperature environment, the air in the chamber pressure adjusting container becomes higher than the air in the surrounding environmental test chamber, and the temperature becomes higher from the upper side in the chamber pressure adjusting container. Since the air is stratified and tries to rise, it is difficult for the air to leak from the lower opening, and it is possible to more effectively prevent the temperature-controlled air in the environmental test chamber from mixing with the air in the room pressure-regulating container. As a result, the air conditioning load on the air conditioner can be further reduced, and more advantageous effects can be obtained in terms of energy saving performance, environmental performance, and cost.

Means 3. The pressure adjusting means includes both the air supply amount adjusting means and the exhaust amount adjusting means.
A pressure detecting means for detecting the pressure in the environmental test chamber and
It is characterized by having a pressure control means capable of controlling the pressure in the chamber pressure adjusting container by controlling the air supply amount adjusting means and the exhaust amount adjusting means based on the pressure detected by the pressure detecting means. The laboratory pressure control device according to means 1 or 2.

According to the above means 3, since the pressure adjusting means includes not only one of the air supply amount adjusting means and the exhaust amount adjusting means but both of them, the pressure in the chamber pressure adjusting container can be quickly adjusted. As a result, the pressure in the environmental test chamber can be adjusted quickly. In addition, since the pressure control means enables pressure control in the chamber pressure adjusting container based on the pressure in the environmental test chamber, the pressure in the environmental test chamber is automatically changed to a desired pressure or maintained at a desired pressure. It becomes easy to do.

It is a side sectional view which shows the schematic structure of the laboratory pressure control device in one Embodiment.

Hereinafter, one embodiment will be described with reference to the drawings. The test chamber pressure control device 1 includes an environmental test chamber 2, an air conditioner 3, an external air supply duct 4, a dehumidifier 5, an indoor gas discharge unit 6, a chamber pressure adjusting container 7, an exhaust duct 8, and a pressure as a pressure adjusting means. It includes an adjusting unit 9, a pressure sensor 10 as a pressure detecting means, and a pressure controlling unit 11 as a pressure controlling means.

The environmental test room 2 has an interior space defined by a plurality of walls provided with a heat insulating material and the like, and a vehicle 21 as a test object is installed in the interior space. The vehicle 21 has an engine (internal combustion engine) (not shown), and the engine discharges exhaust gas during its operation. Further, the environmental test room 2 is provided with doors, shutters, etc. (not shown) for the entry / exit of workers and the entry / exit of the vehicle 21.

The air conditioner 3 is installed in the environmental test room 2, and is for forming a predetermined temperature environment in the environmental test room 2 by adjusting the temperature of the air in the environmental test room 2. .. The air conditioner 3 includes, for example, an electric heater for heating air or a heating coil for flowing a heat medium into a tube, a cooler which is a brine coil or a direct expansion coil for cooling air, and air in an environmental test room 2. It is equipped with a first pressure ventilation fan for sucking in air and a second pressure ventilation fan for blowing out temperature-controlled air to the outside (not shown). The blowers that convey the air in the air conditioner 3 may be combined into one unit as long as static pressure can be secured in a different form such as a sirocco fan without dividing the first pressure ventilation fan and the second pressure ventilation fan. In the present embodiment, the air conditioner 3 can at least adjust the temperature of the air to a low temperature (for example, about −40 ° C. to about 15 ° C.), and by adjusting the air to a low temperature as described above, the environment It is possible to form a low temperature environment (for example, a temperature environment of 0 ° C. or lower) in the test chamber 2. Further, the air conditioner 3 in the present embodiment is not covered with a heat insulating material for preventing dew condensation, and further, a special material having excellent rust preventive performance is not used as a constituent material thereof.

In addition, the air conditioner 3 is connected to one end of a temperature control air supply duct 13 for sending temperature-controlled air (for example, cooled air in this embodiment) to the vehicle 21 side. Further, an air flow velocity forming blowout fan 14 according to the vehicle speed is provided in front of the opening on the other end side of the temperature control air supply duct 13. The air whose temperature is controlled by the air conditioner 3 sucks in both the temperature-controlled air supplied through the temperature-controlled air supply duct 13 and the surrounding indoor air by the operation of the air flow velocity forming blowout fan 14 according to the vehicle speed. It is blown out toward 21. When the engine itself is used as the test object and an air flow adjusted to the vehicle speed is not required, the temperature-controlled air by the air conditioner 3 may be simply discharged into the environmental test room 2.

The external air supply duct 4 communicates with the inside and the outside of the environmental test chamber 2 and constitutes a flow path through which air supplied from the outside into the environmental test chamber 2 passes. The external air supply duct 4 includes a common road 43, and a first passage 41 and a second passage 42, which are branched and formed so as to be connected to the most downstream portion of the common road 43, respectively.

The dehumidifier 5 is arranged outside the environmental test room 2 corresponding to the common road 43 upstream of the branch portion to the first passage 41 and the second passage 42, and enters the environmental test room 2 from the outside. Dehumidifies the supplied external air. The external air dehumidified by the dehumidifier 5 branches into each of the first passage 41 and the second passage 42. In the present embodiment, the dew point temperature of the air dehumidified by the dehumidifier 5 is the same as the dew point temperature of the air under the indoor temperature and humidity conditions set for the test so that the temperature is adjusted by the air conditioner 3. ..

The first passage 41 has a discharge port 41a located in the environmental test chamber 2 at an end thereof. At the discharge port 41a, the air introduced from the outside into the external air supply duct 4 by the operation of the air supply fan 91a described later passes through the dehumidifier 5, and the dehumidified air that has passed through the first passage 41 is inside the environmental test room 2. Is released to. Then, the released dehumidified air is sucked and supplied to the air conditioner 3 together with the air in the environmental test chamber 2 by the blower built in the air conditioner 3. That is, the first passage 41 is indirectly connected to the air conditioner 3.

The end of the second passage 42 is connected to the upper portion (upper surface portion 71, which will be described later) of the chamber pressure adjusting container 7. By the operation of the air supply fan 91a described later, the dehumidified air introduced from the outside is supplied into the chamber pressure adjusting container 7 through the second passage 42.

The indoor gas discharge unit 6 discharges unnecessary gas into the room such as exhaust gas discharged from the vehicle 21 (engine) which is the test object in the environmental test room 2 and ambient air for cooling the exhaust gas to the outside. It is for discharging. The indoor gas discharge unit 6 includes an indoor gas discharge pipe 61 and an indoor gas discharge fan 62.

The indoor gas discharge pipe 61 communicates with the inside and the outside of the environmental test chamber 2 to form a flow path through which the gas passes. At the end of the indoor gas discharge pipe 61, the exhaust gas and the air in the environmental test chamber 2 as the dilution air for diluting the exhaust gas and not overflowing the exhaust gas by indirect connection are taken in. The inlet 61a is provided.

The indoor gas discharge fan 62 is a fan for sending the gas from the inside of the environmental test room 2 to the outside. By the operation of the indoor gas discharge fan 62, the exhaust gas and the air are taken into the indoor gas discharge pipe 61 and mixed, and the exhaust gas diluted by the air and cooled to a sufficiently low temperature (for example, about 350 ° C. or lower) is external. Is discharged to. By diluting the exhaust gas to a low temperature, it is possible to prevent damage to the indoor gas discharge fan 62 and the like.

The chamber pressure adjusting container 7 is a box-shaped body having an internal space, and is arranged at a position in the environmental test chamber 2 away from the floor surface of the environmental test chamber 2. In the present embodiment, the chamber pressure adjusting container 7 includes four side wall portions 73 located between the upper wall portion 71, the lower wall portion 72, and the upper and lower wall portions 71, 72, and has a rectangular parallelepiped shape (box shape). It has the appearance of.

Further, the chamber pressure adjusting container 7 is provided with an opening 7a that communicates its own internal space with the indoor space of the environmental test chamber 2. The opening 7a of the present embodiment is provided in the lower part (lower wall portion 72) of the chamber pressure adjusting container 7, and is composed of one circular or polygonal hole that opens downward. The opening 7a is set to a portion other than the portion of the room pressure adjusting container 7 located on the air conditioner 3 side so that the air in the room pressure adjusting container 7 does not flow out to the air conditioner 3 side due to the operation of the air conditioner 3. It is preferable to form it at the site of.

Further, the internal space of the chamber pressure adjusting container 7 is isolated from the indoor space of the environmental test chamber 2 except for the opening 7a. That is, the opening 7a is the only place where the internal space of the chamber pressure adjusting container 7 directly communicates with the indoor space of the environmental test chamber 2 (without passing through the first passage 41 or the second passage 42). ing.

The exhaust duct 8 connects the inside and the outside of the room pressure adjusting container 7 and constitutes a flow path of air discharged from the inside of the room pressure adjusting container 7 to the outside. The exhaust duct 8 is connected to the chamber pressure adjusting container 7 (side wall portion 73 in this embodiment).

The pressure adjusting unit 9 is for adjusting the pressure in the chamber pressure adjusting container 7 and the environmental test chamber 2. The pressure adjusting unit 9 includes an air supply amount adjusting unit 91 as an air supply amount adjusting means and an exhaust amount adjusting unit 92 as an exhaust amount adjusting means. The pressure in the chamber pressure adjusting container 7 is immediately propagated into the environmental test chamber 2 through the opening 7a. Therefore, the pressure in the environmental test chamber 2 quickly becomes uniform (equal to) the pressure in the chamber pressure adjusting container 7.

The air supply amount adjusting unit 91 is for adjusting the pressure of the environmental test chamber 2 while adjusting the amount of air supplied to the inside of the chamber pressure adjusting container 7 through the second passage 42. The air supply amount adjusting unit 91 includes an air supply fan 91a, a first flow rate control valve 91b, and a second flow rate control valve 91c. The air supply fan 91a is provided corresponding to the common path 43, and is located on the downstream side (first passage 41 and the first passage 41 and the first passage 41) by increasing or decreasing its own operating speed by, for example, an inverter for changing the rotation speed of the fan motor. The flow rate of the air sent to the two passages 42 side) can be changed. The first flow rate control valve 91b is provided corresponding to the first passage 41, and the opening degree of the first passage 41 can be adjusted. The second flow rate control valve 91c is provided corresponding to the second passage 42, and the opening degree of the second passage 42 can be adjusted. In the present embodiment, by the operation of the air supply fan 91a, air is sent to the air conditioner 3 side through the first passage 41, and air is sent into the chamber pressure adjusting container 7 through the second passage 42. Therefore, the air supply fan 91a corresponds to the air supply means.

The exhaust amount adjusting unit 92 is for adjusting the amount of air discharged from the inside of the chamber pressure adjusting container 7 to the outside through the exhaust duct 8. The exhaust amount adjusting unit 92 includes an exhaust fan 92a. The exhaust fan 92a is provided corresponding to the exhaust duct 8. For example, an inverter for changing the rotation speed of the fan motor increases or decreases its own operating speed to send air to the downstream side (outside side). The flow rate can be changed. In the present embodiment, the air in the chamber pressure adjusting container 7 is sent to the outside through the exhaust duct 8 by the operation of the exhaust fan 92a. In the present embodiment, the exhaust fan 92a corresponds to the exhaust means.

The pressure sensor 10 has at least a pressure detecting unit installed in the environmental test chamber 2 and detects the pressure in the environmental test chamber 2. The pressure sensor 10 converts the detected measured pressure measurement value in the environmental test chamber 2 into an electrical signal and transmits it to the pressure control unit 11.

The pressure control unit 11 is composed of, for example, a computer system including a CPU, a ROM for storing various information, a RAM, and the like. The pressure control unit 11 calculates an output signal based on the deviation between the pressure measurement signal detected by the pressure sensor 10 and the pressure set value set in the pressure control unit 11, and the pressure adjustment unit 9 (air supply fan 91a, first flow rate). The pressure in the chamber pressure adjusting container 7 is controlled by outputting a control signal to each of the operators of the control valve 91b, the second flow control valve 91c and the exhaust fan 92a) and controlling them. In the present embodiment, the pressure control unit 11 supplies air to the inside of the room pressure adjusting container 7 through the second passage 42, and air from the inside to the outside of the room pressure adjusting container 7 through the exhaust duct 8. By adjusting the balance with the discharge amount, the pressure in the chamber pressure adjusting container 7 and the pressure in the environmental test chamber 2 are controlled.

Further, the pressure control unit 11 may also be able to control the operation of the indoor gas discharge fan 62. In the present embodiment, the pressure control unit 11 sets the set value and the first passage 41 according to a set value that can be selected in multiple stages of the flow rate of the gas discharged to the outside through the indoor gas discharge pipe 61. The indoor gas is set so that the set value of the flow rate of the air supplied through the environmental test chamber 2 into the environmental test room 2 is set to almost the same amount (more specifically, the flow rate when converted to the standard state is almost the same amount). It controls the operation of the discharge fan 62, the air supply fan 91a, and the like. Of course, the flow rate of the indoor gas discharge fan 62 may be constant.

In the test chamber pressure control device 1 configured as described above, the test piece is subjected to the difference in air volume between the supply of air into the environmental test chamber 2 through the first passage 41 and the exhaust of gas by the indoor gas discharge unit 6. When the intake amount and the exhaust gas discharge amount of the vehicle 21 including the engine are constant, a pressure difference with the outside is generated to some extent in the environmental test chamber 2. That is, when the amount of gas discharged by the indoor gas discharge unit 6 is large and the amount of air supplied to the environmental test room 2 through the first passage 41 is small, a pressure field having a lower pressure than the outside at atmospheric pressure can be formed. The pressure fluctuation in the environmental test chamber 2 due to the transient change in the intake air amount of the vehicle 21 and the exhaust gas amount after combustion due to the change in the operating state of the vehicle 21 to be tested is the pressure control unit 11. The operation of the pressure adjusting unit 9 is controlled to adjust the pressure in the chamber pressure adjusting container 7, and the adjusted pressure can be adjusted by propagating the adjusted pressure into the environmental test chamber 2. For example, the pressure control unit 11 changes the opening due to the immediate response of the first flow control valve 91b and the second flow control valve 91c, which have a quick response, and the change in the air volume of the exhaust fan 92a, which performs a dedicated operation for the pressure change. By controlling the pressure adjusting unit 9 so that the pressure in the chamber pressure adjusting container 7 becomes relatively low, the pressure in the environmental test chamber 2 which is transiently increasing is also immediately relatively low. can do. On the other hand, due to the change in opening due to the immediate response of the first flow control valve 91b and the second flow control valve 91c, which have a quick response, by the pressure control unit 11, and the change in the air volume of the exhaust fan 92a, which performs a dedicated operation for the pressure change. By controlling the pressure adjusting unit 9 so that the pressure in the chamber pressure adjusting container 7 becomes relatively high, the pressure in the environmental test chamber 2 which is transiently decreasing is immediately made relatively high. be able to.

As described in detail above, according to the present embodiment, the chamber pressure is adjusted by adjusting the amount of air supplied through the second passage 42 and the amount of air discharged through the exhaust duct 8 by the pressure adjusting unit 9. The pressure in the adjusting container 7 can be adjusted. Then, since the change in pressure generated at this time is immediately propagated into the environmental test chamber 2 through the opening 7a, the pressure in the environmental test chamber 2 is quickly uniform with the pressure in the chamber pressure adjusting container 7. (Equal). Therefore, the pressure in the environmental test chamber 2 can be adjusted only by positively adjusting the pressure in the chamber pressure adjusting container 7 between the two flow control valves 91b and 91c and the exhaust fan 92a.

Further, the air (the former air) supplied into the environmental test chamber 2 (air conditioner 3 side) through the first passage 41 and the air supplied into the chamber pressure adjusting container 7 through the second passage 42. (The latter air) is dehumidified by a common dehumidifier 5. Therefore, the absolute humidity of both airs can be more reliably made almost equal. In addition, since the temperature of the former air is regulated by the air conditioner 3 while the temperature of the latter air is not particularly regulated, a sufficient temperature difference can be generated between the two airs. Therefore, in general, air having almost the same absolute humidity but having a temperature difference is difficult to be uniform (difficult to mix). Therefore, the air in the environmental test chamber 2 and the air in the chamber pressure adjusting container 7 are different from each other. Can be in a state where it is difficult to be uniform (difficult to mix). As a result, it is possible to effectively prevent the temperature-controlled air in the environmental test chamber 2 from mixing with the air in the chamber pressure adjusting container 7.

Then, since it is possible to prevent the temperature-controlled air from mixing with the air in the room pressure adjusting container 7, the air discharged from the room pressure adjusting container 7 is basically the air whose temperature is not particularly controlled. can do. As a result, it is not necessary to wastefully discharge the temperature-controlled air for pressure control, and in the air conditioner 3, the air entering and exiting the room pressure control container 7, that is, the pressure control in the environmental test room 2. There is almost no need to control the temperature of the air used. As a result, the air conditioning load in the air conditioner 3 can be significantly reduced, and excellent energy saving performance and environmental performance can be exhibited. Further, by reducing the air conditioning load, a relatively small air conditioner 3 (not so high performance) is sufficient, and costs such as running costs can be effectively suppressed.

Further, the air conditioner 3 adjusts the temperature of the air dehumidified by the dehumidifier 5. Therefore, as compared with the case where the temperature of the external air that has not been dehumidified is adjusted, the air conditioning load can be reduced more effectively, and the cost suppression effect can be further enhanced.

Further, since the air supplied into the environmental test room 2 (air conditioner 3 side) and the room pressure adjusting container 7 is dehumidified by the dehumidifier 5, the environmental test room 2 is placed in a low temperature environment as in the present embodiment. In this case, it is possible to more reliably prevent the occurrence of dew condensation in the environmental test chamber 2 and the chamber pressure adjusting container 7. In addition, as the air conditioner 3, one that is not covered with a heat insulating material for preventing dew condensation and does not contain a special material having excellent rust preventive performance as a constituent material can be used. Therefore, cost reduction can be achieved more effectively.

Further, since the dew point temperature of the air dehumidified by the dehumidifier 5 is lower than the temperature of the air temperature-controlled by the air conditioner 3, dew condensation occurs in the environmental test room 2 and the room pressure adjusting container 7. Can be suppressed more reliably.

Further, by configuring the opening 7a to open downward at the lower part of the chamber pressure adjusting container 7, when the inside of the environmental test chamber 2 is set to a low temperature environment as in the present embodiment, the inside of the environmental test chamber 2 is formed. It is possible to more effectively prevent the temperature-controlled air from mixing with the air in the room pressure adjusting container 7. As a result, the air conditioning load on the air conditioner 3 can be further reduced, and more advantageous effects can be obtained in terms of energy saving performance, environmental performance, and cost.

In addition, since the pressure adjusting unit 9 includes not only one of the air supply amount adjusting unit 91 and the exhaust amount adjusting unit 92 but both of them, the pressure in the chamber pressure adjusting container 7 can be quickly adjusted. As a result, the pressure in the environmental test room 2 can be adjusted quickly. Further, since the pressure control unit 11 can control the pressure in the chamber pressure adjusting container 7 based on the pressure in the environmental test chamber 2, the pressure in the environmental test chamber 2 can be automatically changed to a desired pressure. It can easily be maintained at the desired pressure.

The content is not limited to the description of the above embodiment, and may be implemented as follows, for example. Of course, other application examples and modification examples not illustrated below are also possible.

(A) In the above embodiment, the room pressure adjusting container 7 is configured to have a rectangular parallelepiped appearance, but the shape of the room pressure adjusting container 7 is not limited to this. Therefore, for example, the external shape of the chamber pressure adjusting container 7 may be cylindrical, conical, prismatic, spherical, or frustum-shaped.

(B) In the above embodiment, the opening 7a is composed of one circular hole that opens downward and is provided in the lower wall portion 72 of the chamber pressure adjusting container 7. Regarding the arrangement position, shape, and number of 7a, the propagation of the pressure in the chamber pressure adjusting container 7 to the inside of the environmental test chamber 2 and the mixing of the air in the environmental test chamber 2 with the air in the chamber pressure adjusting container 7 It can be changed as appropriate as long as it can be suppressed sufficiently. Therefore, for example, the opening 7a may be provided in the side wall portion 73 (for example, the lower portion of the side wall portion 73) of the chamber pressure adjusting container 7. Further, the openings 7a may have a triangular shape, a rectangular shape, a polygonal shape, an elliptical shape, or the like, or a plurality of openings 7a may be provided.

(C) In the above embodiment, the pressure adjusting unit 9 includes an air supply amount adjusting unit 91 and an exhaust amount adjusting unit 92, and the amount of air supplied to the inside of the chamber pressure adjusting container 7 through the second passage 42. , And the amount of air discharged from the chamber pressure adjusting container 7 through the exhaust duct 8 can be adjusted. On the other hand, only one of the amount of air supplied to the chamber pressure adjusting container 7 passing through the second passage 42 and the amount of air discharged from the chamber pressure adjusting container 7 passing through the exhaust duct 8 is used. The pressure adjusting unit 9 may be configured so as to be adjustable. That is, the pressure adjusting unit 9 may include only one of the air supply amount adjusting unit 91 and the exhaust amount adjusting unit 92.

(D) In the above embodiment, the air supply amount adjusting unit 91 includes an air supply fan 91a, a first flow rate control valve 91b, and a second flow rate control valve 91c, and adjusts the chamber pressure through the second passage 42. As long as the amount of air supplied to the inside of the container 7 can be adjusted, the configuration of the air supply amount adjusting unit 91 may be appropriately changed. Therefore, for example, the air supply amount adjusting unit 91 may be composed of only the air supply fan 91a, or may be composed of one of the first flow rate control valve 91b and the second flow rate control valve 91c and the air supply fan 91a. You may. Further, the air supply amount adjusting unit 91 may include a fan provided corresponding to the second passage 42.

(E) The air supply fan 91a in the above embodiment is configured so that the flow rate of air sent to the downstream side (first passage 41 and second passage 42 side) can be changed, but the air supply fan is rotated at a constant speed. It may be configured to rotate by and send a certain amount of air to the downstream side. In this case, the air supply amount adjusting unit 91 has at least the first flow rate control valve 91b as an essential configuration. Further, the exhaust amount adjusting unit 92 can be configured by an exhaust fan 92a having a variable flow rate.

(F) In the above embodiment, the air supply means is composed of the air supply fans 91a provided in the common passage 43, but is provided by the air supply fans provided in the first passage 41 and the second passage 42, respectively. The air supply means may be configured. That is, the air supply means may have a configuration in which one that sends air through the first passage 41 and one that sends air through the second passage 42 are separate. In this case, the amount of air supplied to the chamber pressure adjusting container 7 through the second passage 42 may be adjusted by the air supply fan provided in the second passage 42. That is, the air supply fan provided in the second passage 42 may be a component of the air supply amount adjusting unit 91.

(G) In the above embodiment, the exhaust amount adjusting unit 92 is composed of an exhaust fan 92a, but the amount of air discharged from the chamber pressure adjusting container 7 to the outside through the exhaust duct 8 can be adjusted. As long as the configuration of the exhaust gas amount adjusting unit 92 may be changed as appropriate. Therefore, for example, the exhaust amount adjusting unit 92 may be composed of an exhaust fan 92a and a flow rate control valve capable of adjusting the flow path cross section (flow path resistance) of the exhaust duct 8.

(H) The exhaust fan 92a in the above embodiment is configured so that the flow rate of air sent to the downstream side (outside) can be changed, but the exhaust fan is assumed to rotate at a constant rotation speed and moves to the downstream side. It may be configured to send a constant flow rate of air. In this case, the exhaust amount adjusting unit 92 can be configured by a flow rate control valve capable of adjusting the flow path cross section (flow path resistance) of the exhaust duct 8.

(I) In the above embodiment, the vehicle 21 is illustrated as the test object, but the test object is not limited to this. Therefore, the test piece may be, for example, a single engine or a prime mover.

1 ... Test room pressure controller, 2 ... Environmental test room, 3 ... Air conditioner, 4 ... External air supply duct, 5 ... Dehumidifier, 7 ... Room pressure control container, 7a ... Opening, 8 ... Exhaust duct, 9 ... Pressure adjusting unit (pressure adjusting means), 10 ... Pressure sensor (pressure detecting means), 11 ... Pressure control unit (pressure controlling means), 21 ... Vehicle (test object), 41 ... First passage, 41a ... Discharge port , 42 ... Second passage, 91 ... Air supply amount adjusting unit (air supply amount adjusting means), 92 ... Exhaust amount adjusting unit (exhaust amount adjusting means), 91a ... Air supply fan (air supply means), 92a ... Exhaust fan (Exhaust means).

Claims (3)

An air conditioner that can adjust the temperature of the air in the installed room,
It is equipped with an environmental test room in which the test piece is installed and a predetermined temperature environment can be formed by the air conditioner installed inside.
A test chamber pressure control device capable of controlling the pressure in the environmental test chamber when the test subject is installed in the environmental test chamber and then tested.
A first passage having a discharge port located in the environmental test chamber and being configured to be able to supply external air discharged from the discharge port to the air conditioner and indirectly connected to the air conditioner, and the first passage. An external air supply duct that is branched into a second passage different from the passage and through which external air supplied from the outside to the environmental test chamber passes.
A dehumidifier arranged upstream of the first passage and the branch portion of the second passage in the external air supply duct to dehumidify the external air supplied from the outside to the environmental test chamber.
A chamber pressure adjusting container arranged in the environmental test chamber, connected to the second passage, and provided with an internal space.
An exhaust duct that is connected to the chamber pressure adjusting container and exhausts the air in the chamber pressure adjusting container to the outside.
An air supply means that sends air to the air conditioner side through the first passage and also applies dynamic pressure to the air to send air through the second passage into the chamber pressure adjusting container.
An exhaust means for exhausting the air in the chamber pressure adjusting container to the outside through the exhaust duct,
The air supply amount adjusting means for adjusting the amount of air supplied to the inside of the room pressure adjusting container through the second passage, and the amount of air discharged from the inside of the room pressure adjusting container through the exhaust duct. It includes at least one of the exhaust gas adjusting means for adjusting, and has a pressure adjusting means capable of adjusting the pressure in the environmental test chamber.
The chamber pressure adjusting container is provided with an opening communicating with the indoor space of the environmental test chamber, and the internal space of the chamber pressure adjusting container and the indoor space of the environmental test chamber are separated from each other except for the opening. A laboratory pressure control device characterized in that it is configured to be in a state. The test chamber pressure control device according to claim 1, wherein the opening is provided in the lower portion of the chamber pressure adjusting container and opens downward. The pressure adjusting means includes both the air supply amount adjusting means and the exhaust amount adjusting means.
A pressure detecting means for detecting the pressure in the environmental test chamber and
It is characterized by having a pressure control means capable of controlling the pressure in the chamber pressure adjusting container by controlling the air supply amount adjusting means and the exhaust amount adjusting means based on the pressure detected by the pressure detecting means. The laboratory pressure control device according to claim 1 or 2.

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