JPS6415149U - - Google Patents

Description

[Brief explanation of the drawing]

Figures 1 and 7 show examples of the device according to the present invention, Figure 1 is a schematic diagram of the device, Figure 2 is a graph showing the relationship between absolute humidity and temperature, and Figure 3 is relative humidity. Figure 4 is a schematic diagram showing the flow of refrigerant in the refrigeration cycle in the low humidity range, Figure 5 is a schematic diagram showing the flow of refrigerant in the low temperature and high humidity range, and Figure 6 is the general diagram. FIG. 7 is a schematic diagram showing the flow of refrigerant in the humidification range, FIG. 7 is a time chart showing the operating state, and FIG. 8 is a schematic diagram of the device showing the prior art. 1,42...Casing, 2,40...Environmental test device, 4,44...Partition plate, 6,46...Test chamber, 8,
48... Constant temperature and humidity air supply chamber, 10, 50... Compressor, 12, 52... Condenser, 14, 54... Expansion valve, 1
6,56...evaporator, 18,60...accumulator, 20,62...electrothermal heater, 22,64...blower, 24,80...humidifier, 26,67...temperature sensor, 28,72...temperature control device, 30, 66...
Temperature sensor, 32, 68...Humidity control device, 58
...Evaporation pressure adjustment valve, 70...Drive circuit, 74...Power supply circuit, 76, 78...Solenoid valve, 77...Expansion valve,
80... Humidifier, 79... Constant pressure pressure regulating valve.

Claims (1)

[Scope of utility model registration request] The compressor, condenser, expansion valve, evaporator, evaporation pressure adjustment valve, refrigeration cycle evaporator, electric heater, and air blower were placed in an environmental test device covered with a casing made of heat insulating material. In the apparatus, a solenoid valve and an expansion valve connected in series are connected in parallel with an expansion valve between a refrigerant outlet of the condenser and a refrigerant inlet of the evaporator, and a solenoid valve and an expansion valve connected in series are connected between the refrigerant outlet of the expansion valve and the refrigerant inlet of the accumulator. The control device adjusts the opening degree of the evaporation pressure regulating valve to achieve the set humidity based on the detection signal from the humidity sensor installed in the environmental test device. . An environmental test device, characterized in that the expansion valve is configured to be switched by turning on and off a solenoid valve.