CN2069554U

CN2069554U - Simple and easy internal thermal type sample digestion electric heater

Info

Publication number: CN2069554U
Application number: CN 90208080
Authority: CN
Inventors: 李云生
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-05-31
Filing date: 1990-05-31
Publication date: 1991-01-16

Abstract

The utility model relates to a simple and easy internal thermal type sample digestion electric heater which is composed of an internal thermal metal block, a temperature self-control structure and a heating control circuit. The temperature self-control structure can be realized by a fixed contact arm, a thermal couple piece and the contact points of the end parts of the fixed contact arm and the thermal couple piece, wherein, the fixed contact arm and the thermal couple piece are fixedly arranged on one side wall of a metal block body.

Description

Simple and easy internal thermal type sample digestion electric heater

The utility model relates to a kind of simple and easy internal heat type treatments of the sample electric heater, belongs to the physico-chemical analysis assay device, and it comprises internal heat type metal blocks, temp autocontrolled structure and heating control circuit three parts.

The laboratory personnel by instrument to before micronutrient levels is analyzed in some sample, need the sample heated at constant temperature is carried out digestion process, common this thermal treatment all is the digest tube that will sample be housed to be inserted in the hole on the special-purpose metal heat conductor piece, thereby whole heat conductor piece is put on the electric hot plate heating indirectly to the digestion process of heating of sample in the digest tube, and this external heating mode thermal efficiency is low, power consumption big and do not have temp autocontrolled structure.

For addressing the above problem, Chinese patent application 90200793.9 provides a kind of internal heat type treatments of the sample electric heater, it the internal heat type metal blocks of electrothermal conductor core, temp autocontrolled structure and heating control circuit by plug-in mounting in it and forms, it has, and high heat is imitated and thermostatic control is very accurate, but because its temp autocontrolled structure is too complicated, the complete machine cost has also been improved relatively.

The utility model purpose is: prior art is done further improvement, provide a kind of temp autocontrolled structure and heating control circuit internal heat type treatments of the sample electric heater simple, with low cost.

The concrete scheme of the utility model is as follows: same as the prior art, it is also by the internal heat type metal blocks, temp autocontrolled structure and heating control circuit three parts are formed, different is: described temp autocontrolled structure is by thermocouples plate 6, fixed contact arm 7 and terminal separately contact 9,10 and temperature adjusting lever 8 form, thermocouples plate 6 directly is installed on thermal insulation material on the sidewall of internal heat type metal blocks with fixed contact arm 7 head ends, plane, three place is parallel to each other, thermocouples plate 6 occupy between fixed contact arm 7 and the metal blocks sidewall, thermocouples plate 6 is just to the bending of block sidewall direction when metal blocks warms up, its terminal contacts 9 promptly is separated with fixed contact arm 7 terminal contacts 10, thermocouples plate 6 is just to the 7 direction bendings of fixed contact arm when derby cools down, the two terminal contacts 9,10 promptly connect, temperature adjusting lever 8 is perpendicular with fixed contact arm 7, and the one end is exposed to machine shell for adjusting operation, the other end withstands on the fixed contact arm 7; Described heating control circuit is to be in series by the temperature detect switch (TDS) that the heating wire of electrothermal conductor in-core and contact 9,10 constitute, and the alternating current 220V power supply directly is added on the above-mentioned series arm two ends by power switch.

Fig. 1 is the utility model general structure synoptic diagram.

Fig. 2 is the utility model control circuit figure.

Below in conjunction with accompanying drawing the utility model is done further narration:

As shown in Figure 1, heating of metal of the present utility model (adopt aluminium or cast iron) but the upper surface of block 1 has the hole 2 that has plug-in mounting electrothermal conductor core on the hole 3, its lower surface of some plug-in mounting digest tubes downwards, between block 1 outside surface and housing 4, filling insulation material 5.Temp autocontrolled structure mainly by thermocouples plate 6, fixed contact arm 7 and separately contact 9,10 and the temperature adjusting lever 8 on the end form, whole structure of controlling temperature is contained in the groove of metal blocks 1 one sides.During work, when the temperature of electric heating metal blocks 1 reached predetermined value, the end of thermocouples plate 6 was incited somebody to action bending to the right, the contact was opened in 9,10 minutes, cuts off heating power supply; After metal blocks 1 temperature descended, the end of thermocouples plate 6 was crooked left again, contact 9,10 is contacted, and heating power supply be that metal blocks 1 energising is heated again, so move in circles, the temperature of block 1 with basicly stable on predetermined value.For easy to use, adopt two structure of controlling temperature independently separately in this example, switch by selector switch and realize two constant temperature stages controls.Power switch 11, relay indicating light 13 have also been showed among the figure.

Electrical schematic diagram shown in Figure 2 is as power switch K ₁After the connection, power supply passes through K ₁, pilot lamp D, resistive heater R, temperature detect switch (TDS) K ₃Or K ₄, again by selector switch K ₂Get back to electrical network, K ₂Can select K ₃Or K ₄Work.

The utility model advantage is: simple structure, cost are low, are convenient to promote the use of.

Claims

1, simple and easy internal heat type treatments of the sample electric heater, form by internal heat type metal blocks, temperature automatic control structure and heating control circuit three parts, in block, have a plurality of plug-in mounting treatments of the sample pipe holes, lower surface on the top end face of metal blocks and also in block, have some holes for plug-in mounting electrothermal conductor cores, clamp insulation material between metal blocks outer wall and the electric heater machine shell, it is characterized in that:

A, described temp autocontrolled structure is by thermocouples plate 6, fixed contact arm 7 and terminal separately contact 9,10 and temperature adjusting lever 8 form, thermocouples plate 6 directly is installed on thermal insulation material on the sidewall of internal heat type metal blocks with fixed contact arm 7 head ends, plane, three place is parallel to each other, thermocouples plate 6 occupy between fixed contact arm 7 and the metal blocks sidewall, thermocouples plate 6 is just to the bending of block sidewall direction when metal blocks warms up, its terminal contacts 9 promptly is separated with fixed contact arm 7 terminal contacts 10, thermocouples plate 6 is just to the 7 direction bendings of fixed contact arm when metal blocks cools down, the two terminal contacts 9,10 promptly connect, temperature adjusting lever 8 is perpendicular with fixed contact arm 7, and the one end is exposed to machine shell outward for adjusting operation, the other end withstands on the fixed contact arm 7;

B, described heating control circuit are that civil power alternating current 220V power supply is added in the branch road two ends that temperature detect switch (TDS) that the heating wire of electrothermal conductor in-core and contact 9,10 constitute is in series.