Abstract: A device for controlling the air pressure within a low pressure environmental testing chamber for a self-propelled vehicle is disclosed. According to the invention, the device includes a system for introducing the outside air into the testing chamber, a first air pipe having an air suction port at its one end positioned in the vicinity of a discharge opening of a discharge duct of the vehicle disposed in the testing chamber and having its other end connected to a main air pipe, a second air pipe having an air inlet at its one end opened into the testing chamber and having its other end connected to the main air valve, an air blower adapted for reducing the air pressure, the air blower having a variable r.p.m. and mounted halfway in the main air pipe, a first silencer provided in the main air pipe at the air discharge side of the air blower and opened into atmosphere, and a branched pipe having a second silencer at an outside air intake side.

Abstract: In a pressure-controlling apparatus employed in a pre-chamber of an environmental testing chamber for a self-propelled vehicle, in which testing chamber various tests are conducted under a subatmospheric pressure, which testing chamber is provided with the pre-chamber for permitting an opertor's getting in/out of the testing chamber, the improvement resides in that: operational switch means provided in the pre-chamber permit the operator to open/close a first and a second opening/closing valves, which first opening/closing valve is provided in a first air-duct which opens into open air at one end and into said pre-chamber at the other end for recovering an air-pressure of the pre-chamber, which second opening/closing valve is provided in a second air-duct which opens into the testing chamber at one end and into the pre-chamber at the other end for reducing the air-pressure of the pre-chamber.

Abstract: A snow-weathering test apparatus for a self-propelled vehicle, comprises: a low-temperature testing chamber; a water-spraying unit provided with a truck having a wheel, on which truck is mounted a two-fluid injection nozzle for spraying water with an air-jet into a mist, which water-spraying unit is movably provided in the low-temperature testing chamber; a cooling unit provided with an air-feed duct connected between the low-temperature testing chamber and the cooling unit to feed a cooling air issued from the cooling unit to the low-temperature testing chamber; an air-return duct connected between the low-temperature testing chamber and the cooling unit to permit the cooling air to return to the cooling unit from the low-temperature testing chamber; and a snow-catching unit provided with a heating unit, for catching a snow carried by the cooling air from the low-temperature chamber, which heating unit is employed to melt the snow caught by the snow-catching unit.

Abstract: A salt damage environmental testing chamber for self-propelled vehicles which is provided with a salt water spraying system, is disclosed. According to the present invention, a protective cover that may be opened and closed by a cover opening and closing device is provided in the vicinity of a humidty sensor provided in turn in the test chamber. The cover opening and closing device is actuated at the time of spraying of salt water into the test chamber to close the protective cover so that the humdity sensor is covered by the protective cover.

Abstract: A humid-environmental testing apparatus for determining a corrosion-resistance of a self-propelled vehicle, comprises: an oblique indoor-ceiling board installed in an upper portion of a main frame of the apparatus; a ceiling duct defined between a ceiling surface of the main frame and the indoor-ceiling board; a testing chamber positioned under the indoor-ceiling board, in which chamber an air-inlet portion of the ceiling duct opens; an air-intake duct provided with an air-conditioning unit, with which air-intake duct is connected an air-outlet portion of the ceiling duct; an air-discharging duct making its air-discharging opening open into the testing chamber, with which air-discharging duct is connected the air-intake duct; and drainage means provided in a lower edge portion of the oblique indoor-ceiling board.

Abstract: An adjustable constant temperature and humidity control device for self-propelled vehicles is disclosed. According to the invention, the control device includes a duct system providing a circulating air channel for conducting the air contained in the testing chamber out of the testing chamber and again conducting the air into the chamber. The duct has arranged therein an air blower, a humidifier and an air conditioning unit adapted for performing a sensible heat exchange operation. The device also includes a dehumidifier mounted outside of the testing chamber and designed for introducing the air from the testing chambers as to free the air of its water contents and return the dehumidified air into the chamber and a supply pipe for supplying a thermal medium from a reservoir by a pump into the air conditioning unit, wherein the thermal medium has been supplied from a refrigerater into said reservoir as cold water.

Abstract: In conducting an environmental test of a vehicle, the vehicle is housed in the testing chamber and in which the vehicle is subjected to test simulating external environmental various conditions. In such test, it is often required to keep the vehicle stationary while varying a temperature and a humidity of the testing chamber. In such a case, the testing chamber provided with a by-pass air duct at a position near a ceiling portion of the testing chamber enables the vehicle being tested to be prevented from being subjected to an air flow caused by air-conditioning operation of the testing chamber, which improves a test in accuracy in case that the test must be conducted at a desired temperature/humidity condition.

Abstract: A system for use with a freezing liquid (refrigerant) spray refrigerator for foods, in order to purify the refrigerant contaminated with solid filth such as a scale of a fish, dust or the like. Removal of such solid filth from the refrigerant for purification and re-use of the purified refrigerant can be carried out by an arrangement, wherein the refrigerant once sprayed onto the foods for refrigeration and contaminated with solid filth such as a scale of a fish, dust or the like will be conveyed to a filter for separating the solid filth from the refrigerant contaminated with the solid filth; the refrigerant so treated will then be conveyed to a heater in order to heat the refrigerant thereby to flocculate a fat, blood or the like of the foods still remaining in the refrigerant; the refrigerant will further be conveyed to a filter to remove the coagulum; and the refrigerant so purified will finally be conveyed to a reservoir tank for re-use.