Natural convection high-precision thermostat

Abstract

The invention discloses a natural convection type high-precision thermostat. The natural convection type high-precision thermostat is characterized by being provided with a heat insulating thermostat body, wherein a cavity of the thermostat body is divided into an upper refrigeration cavity and a lower constant-temperature cavity by a steady flow plate at the upper part inside the thermostat body; semiconductor refrigeration modules running through the top of the thermostat body are uniformly distributed at the top of the thermostat body, a semiconductor refrigeration fin is tightly clamped between an outer cooling fin and an inner cooling fin by which each semiconductor refrigeration module is formed, each inner cooling fin is arranged in the upper refrigeration cavity of the thermostat body, each outer cooling fin is arranged at the upper part of a top plate of the thermostat body, and a cooling fan is arranged above the outer cooling fins. The thermostat is high in precision of temperature control, free from vibration, small in size, low in energy consumption and cost, convenient to move and especially applicable to the field of micro-nano measurement.

Description

technical field [0001] The invention relates to the technical field of micro-nano measurement, and more specifically relates to a high-precision constant temperature box of a micro-nano three-coordinate measuring machine. Background technique [0002] In the technical fields of micro-nano measurement, manufacturing and control, it is necessary to precisely control the ambient temperature to effectively reduce the influence of thermal deformation errors, and it is usually required that the fluctuation of the ambient temperature is not greater than 0.05°C. At present, there are two main temperature control methods in this field: one is the constant temperature laboratory, and the heat insulation layer is composed of polyurethane foam board, but its cost is high and the temperature control accuracy is relatively low. The temperature effect is easily affected by personnel activities; the other is a separate incubator, which is made of galvanized thin steel plates to form a sandw...

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Problems solved by technology

At present, there are two main temperature control methods in this field: one is the constant temperature laboratory, and the heat insulation layer is composed of polyurethane foam board, but its cost is high and the temperature control accuracy is relatively low. The temperature effect is easily affected by personnel activities; the other is a separate incubator, which is made of galvanized thin steel plates to form a sandwich structure on the inner and outer walls. The interlayer is filled with ultra-fine glass wool to form a box, and the fan is used for air convection. The temperature control accuracy is high, but the volume is large, the energy consumption is high, and the weight is large, especially the vibration caused by the air supply system will adversely affect the measurement

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