Detailed description of the structural design concept of the constant temperature and humidity test chamber
A well-performed constant temperature and humidity test chamber requires a reasonable structural design and tight control of the control circuit to achieve high stability. The structural design of the test box should include the design of the test box body, the design of the seal of the box and the mechanical structure design of the reciprocating motion of the frame. Among them, the mechanical structure design inside the box is the focus of the design. The purpose of the design is to enable the test tube holder in the test box to reciprocate back and forth, so that the test sample can maintain sufficient temperature and humidity.
For the structural design of the constant temperature and humidity test chamber, it is necessary to conceive all possible functional principles according to the functional requirements expected by the machine, analyze and compare them according to the use requirements or process requirements, and select them to meet the functional requirements. The process is simple and works. The above steps are called functional principle design, which is the first step in the design of mechanical execution system. To achieve the same functional requirements, many different working principles can be selected, and the corresponding implementation system schemes must be different. If you do not consider the commutation, only consider the forward and backward feed process, you can use the following methods:
1. Use the constant temperature and humidity test box gear rack or sprocket chain drive to control the forward and reverse of the motor with the inverted and forward switch;
2. The reciprocating motion of the mechanism can also be realized by the planar cam linkage mechanism;
3. The reciprocating motion of the mechanism can also be realized by the eccentric wheel of the center;
4, using a crank slider mechanism.
In the actual design process, the final plan can be determined according to economic and other influencing factors. The main requirements of the structure and process of the constant temperature and humidity test chamber are: good sealing performance; thermal conductivity of the insulation layer is small to ensure good temperature guiding performance; heating body has sufficient heat capacity; test box weight ≤ 20kg; temperature adjustment range is : room temperature 10 ° C ~ 70 ° C. Only by meeting these requirements can the initial heating power, the heating power in the equilibrium state, the heating time and the control temperature fluctuation in the tank be reduced, thereby ensuring good performance of the test box.
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