Precision thermostatic control laboratory box
A technology of constant temperature control and constant temperature controller, which is applied in the direction of using electric means for temperature control, electric controller, controller with specific characteristics, etc., can solve the problems of publicity and no specific structure, and reduce breakdown damage. , good thermal insulation effect, cost saving effect
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Embodiment 1
[0057] Embodiment 1 Illustrates the general structure of the present invention in conjunction with accompanying drawing
[0058] The precise constant temperature control box of the present invention can be divided into two parts: a constant temperature box (10) and a constant temperature controller.
[0059] Said incubator (10) includes a thermal insulation component and a heat transfer component.
[0060] The function of the insulation part is to make the heat transferred in by the heat transfer part return to the external environment as little as possible. Such as figure 2 As shown, the thermal insulation part of the thermostat (10) is as follows: the shell (11) of the box is designed with a stainless steel material, which ensures the strength of the whole box. The aluminum with good thermal conductivity is used as the material of the liner (12) for making the air temperature everywhere in the case consistent as far as possible. The thermal insulation layer (13) adopts p...
Embodiment 2
[0065] Embodiment 2 Illustrate the circuit structure of the constant temperature controller with reference to the accompanying drawings
[0066] Such as image 3 As shown, the temperature setting circuit (1) of the thermostat controller includes: an external DC power supply (Vcc) connected to a 9.1k resistor, connected to a precision voltage reference module (LM336), grounded to the LM336 and connected to a 10k potentiometer, the tap of which is connected to The op amp U7B is connected to the inverting input terminal; the inverting input terminal of the op amp U7B is connected to a 10k resistor to ground, and a 22k resistor is connected to the U7B output. In addition, in order to improve the driving ability, a voltage follower composed of U2B is added to the output of U7B. The non-inverting input of U2B is connected to the output of U7B, and the inverting input of U2B is connected to its output.
[0067] Such as Figure 4 As shown, the temperature measurement circuit (2) of ...
Embodiment 3
[0073] Embodiment 3 The design of the PID control system of the present invention
[0074] The constant temperature controller part of the constant temperature control experiment box is obtained by changing the PID control parameters. The method of determining this parameter is as follows:
[0075] Since the entire system involves many links, it is inconvenient to analyze directly in the time domain, so it is necessary to establish a system model in the S domain. The open-loop transfer function of the system consists of two parts, the transfer function of the PID control system and the transfer function of the controlled system, that is, G(s)=G 1 (s)·G 2 (s), and because C(s)=G(s)·[R(s)-C(s)], the system closed-loop transfer function:
[0076] C ( s ) R ( s ) = ...
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Abstract
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