CN1064962A - Explosion-proof thermostatic box - Google Patents

Abstract

A kind of explosion-proof thermostatic box that is used to lay the precision measurement sensor, form by casing and loam cake two parts that aluminium alloy compression casting is made, both inwalls all cloth cover cellular plastic or rubber is made insulating lining, the power supply of sensor and pressure guiding pipe insert by the cable sealing box on the tank wall with the aperture that gland and filler are sealed respectively, at loam cake and box inside conductor refrigeration (heat) device and the temperature control surface-mounted integrated circuit of controlling its duty are housed respectively.This casing constant temperature isolation performance is good, makes working sensor reliable and stable, and measuring accuracy greatly improves, and can save its temperature-compensation circuit, simplified structure, reduced volume and improve serviceable life.

Description

Explosion-proof thermostatic box

The present invention relates to a kind of precision measurement sensor that is used to and set up an explosion-proof thermostatic box of avoiding the thermostatic isolating environment of external interference, belong to the matched auxiliaring equipment technical field of electro-mechanical system.

In petroleum prospecting, exploitation, geological prospecting, digging and other many branchs of industry, all need to measure the parameter such as various pressure, stress of laminar surface similarly and even depths, stratum, some parameters precision requires very high, for this reason, except the high-acruracy survey sensor of special outfit, also to consider to get rid of the sum of errors drift that nature such as extraneous weather, temperature or artificial environment cause measurement.Therefore, some high-precision sensor disposes compensating device devices such as temperature miscellaneous, humidity toward contact, causes sensor and annex volume thereof numerous and jumbled in addition disorderly, use inconvenience, and multiple compensation adjustment device always brings error more or less, influences measuring accuracy.

The purpose of this invention is to provide a kind of thermostatic isolating environment-explosion-proof thermostatic box of avoiding external interference of setting up for above-mentioned precision measurement sensor.

Realization of the present invention has mainly relied on modern microelectronic new achievement: a kind of can be different and carry out the semiconductor devices of refrigeration or pyrogenicity respectively according to voltage direction that the device two ends applied.This device was just succeeded in developing by the scientific and technical personnel of the Chinese Academy of Sciences as far back as 1966, but device power was little at that time, and power consumption height, price are high, fail to be generalizable.Through scientific and technical personnel's persevering endeavors all the year round tackling key problem.The conductor refrigeration of this application peltier effect, heating device can have been accomplished little power consumption and enough refrigeration (heat) power that has now, working stability is reliable, long service life, cost price also significantly reduce, and are progressively applied in branch of industry.For example in the atmosphere furnace of heat treatment process, kiln, used this device.This device cast aside at all need not be traditional refrigerant-fluorine Lyons carry out refrigeration cooling, can the ozone in the atmosphere not caused damage, can protect existent environment of people; This can pyrogenicity heat this device again backward in changing its supplier of electricity, have dual difference in functionality, both simplified the design of control circuit etc., the investment of having saved device material again, useful volume in the casing of the present invention is increased, and is the new unit of achieving many things at one stroke.The present invention also is the bit part that this device is shown up prominently in the electromechanical integration field, believe that performance along with this device is gradually improved and people endeavour exploitation, this novel microelectronic is learned product and can popularized, promote in increasing industry and sphere of life.

Fig. 1 is a structure cross-sectional schematic of the present invention.

As shown in the figure, the present invention is made up of casing 1 and loam cake 2 two parts, between the faying face of casing and loam cake, is lined with sealed plastic thin slice 3 and is fastenedly connected both with bolt 4.Characteristics of the present invention are that casing 1 and loam cake 2 all are to make with aluminum alloy materials die casting, and all the multiple one deck cellular plastic of cloth or rubber 5 are as lining for both inwalls, and this also is the adiabatic separation layer of one deck, to reduce heat transmission and the thermal radiation inside and outside the casing.A cable sealing box 6 that is used for outgoing cable is housed on the wall box, and the power supply in the casing and the lead-in wire of other electron devices are all thus outside box 6 outlet boxs.Be provided with a plurality of apertures at bottom half, the pressure guiding pipe 12 of the sensor 11 in the case is by in the direct leading-in box in this hole, and sealed with gland 7 and filler 8 respectively.Whole box body needs can formally install and use through qualified the checking and approving of explosion-proof test.At lower box and loam cake inboard a conductor refrigeration (heat) device 9 is installed respectively, this is a kind of general novel electron refrigeration (heat) device, and its specification can be selected corresponding suitable product according to the external environmental condition of casing size dimension and use occasion.The big the whole nation border Electronics Co., Ltd. of China just produces this novel microelectronic and learns device.The temperature control integrated circuit plate 10 of control conductor refrigeration (heat) device 9 work also is housed in the casing.This temperature control circuit board also has been a kind of general outsourcing device now, and the numeric type control temperature meter that domestic Beijing produces just can be used as temperature control surface-mounted integrated circuit 10 and uses, and also can select for use other to have the product of similar functions.We can accurately set the temperature inside the box of the present invention (being advisable with 30 ℃～50 ℃) with temperature control circuit board.When the temperature inside the box was lower than design temperature, the temperature control circuit board in the casing will be connected the power supply of conductor refrigeration (heat) device, and this device is heat temperature raising automatically, and the general heating element of its thermal efficiency (as resistance wire etc.) is wanted height.When treating that the temperature inside the box reaches design temperature, temperature control circuit board can cut off power supply automatically, and conductor refrigeration (heat) device promptly quits work then, maintains in the casing within the design temperature scope.When if temperature is higher than design temperature in the casing, temperature control circuit board in the same casing will change supplier of electricity to, connect the power supply of conductor refrigeration (heat) device from other direction, make the automatic refrigeration cooling of this device, when the temperature inside the box dropped to setting value, it was quit work by the automatic outage of temperature control circuit control can again.

Because the precision of temperature control circuit board is very high, can be strict controlled in temperature in the range of set temperature and (be no more than ± 0.1 ℃), so, although the external environment of sensor is very abominable, even open-air in the open air often occasion is used, also because constant temperature provided by the invention isolation explosion-proof environment is very good, temperature is almost invariable, the precision of sensor is greatly improved, and, also can cancel it to the temperature-compensation circuit of sensor itself, its structure is greatly simplified, its volume is also corresponding obviously to be dwindled.Like this, just can be contained in many sensors simultaneously in the casing provided by the present invention, for example, can adorn 4～24 sensors in the casing.And the present invention is because relatively simple for structure, low cost of manufacture; The device power consumption is also quite limited, has the very high ratio of performance to price.Moreover, because sensor is placed in the casing by isolation, and the condition of work of sensor is greatly improved, and can extremely effectively work reliably, only otherwise exceed the specified measurement range of sensor defined, its serviceable life can with the mission life (10 of semiconductor devices of the present invention ⁵More than hour) be equal to mutually-also promptly belong to lifelong use basically and need replacing person.

Claims (2)

1, a kind of explosion-proof thermostatic box that is used to lay the precision measurement sensor, form by casing 1 and loam cake 2 two parts, between the faying face of casing and loam cake, be lined with sealed plastic thin slice 3 and be fastenedly connected both with bolt 4, it is characterized in that casing 1 and loam cake 2 all are to make with aluminum alloy materials die casting, both inwalls all the multiple one deck cellular plastic of cloth or rubber 5 as lining, a cable sealing box 6 that is used for outgoing cable is housed on the wall box, the pressure guiding pipe 12 of the sensor 11 in the case is by in the direct leading-in box in this hole, and sealed respectively with gland 7 and filler 8, at loam cake and box inside conductor refrigeration (heat) device 9 is housed respectively, control conductor refrigeration (heat) device 9 also is housed, the temperature control integrated circuit plate 10 of work in the case.

2, explosion-proof thermostatic box as claimed in claim 1 is characterized in that conductor refrigeration (heat) device can be the product of the big the whole nation border Electronics Co., Ltd. of China.

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