CN85201432U

CN85201432U - Domestic constant temp. culture cabinet

Info

Publication number: CN85201432U
Application number: CN198585201432U
Authority: CN
Inventors: 罗刚
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-04-19
Filing date: 1985-04-19
Publication date: 1987-01-07

Abstract

The utility model discloses a domestic constant temp. culture cabinet. The utility model is equipment for culturing in the constant temperature. The cabinet body of the utility model is adopted with rigid foam plastic to manufacture. Adopting the method that copper wires or soft steel wires are pasted between the two layers of paper, an electric heater is manufactured, and the electric heater is pasted on the inner wall of the cabinet body by glues directly. Compared with the ordinary constant temp. culture cabinet, the utility model has low cost (about 20% ordinary constant temp. culture cabinet). The utility model has the advantages of light weight, high precision, low power consumption, uniform temperature in the cabinet. The utility model is safe.

Description

Domestic constant temp. culture cabinet

The utility model is the equipment that a kind of constant temperature culture is used.

Present constant incubator is mainly used in that chemical examination is cultivated and purposes such as the breeding of experimental nature, hatching.

All constant incubators are formed by casing, electric heater, temperature controller (abbreviation thermostat) three parts.The casing of common constant incubator mostly adopts cold-rolled steel sheet to make.Filling plays the mineral wool (4) of insulation effect between (referring to Fig. 1) case shell (1) and heating clamber (2) and operating room (3).Electric heater (5) mostly is resistive heater.Branch two is assembled in the bottom of heating clamber.Cold air enters heating clamber by bottom inflow hole (6), and participates in the convection current of passing through wind hole (7) between hot cell and the operating room.The convection current of air makes that the temperature in the case is even substantially.Slowly outwards exhaust is fresh with air in the maintenance case for the air-valve (8) on case top.Temperature control component adopts bimetal leaf more, cooperates electron tube or transistor circuit and relay to realize " dibit control ".Its temperature control scope is generally 20 ℃～60 ℃, and temperature-controlled precision generally can both reach ± and 1 ℃.This constant incubator has limited family and has been extensive use of owing to cost is higher.

The purpose of this utility model is to provide a kind of cost low, economical and practical, can be the constant incubator that numerous domestic consumers accepted.It has reduced cost significantly having guaranteed that every technical indicator is not less than under the prerequisite of common constant incubator, thereby makes this series products to be accepted by general family.It except purposes with common constant incubator, can also be used for commodity production character hatching, heliculture, mushroom cultivation, breeding, brewage, aspect such as wheaten food fermentation.

Main points of the present utility model are that its casing and door all adopt rigid foam such as GPPS foamed plastics to send out to mould in mould to form.For firm and attractive in appearance, can paste plastic facing on its surface, but also brushing oil paint.The method that adopts plastic hinged to stick with glue is contained in door on the casing.The encapsulant at crack between a door and its frame place adopts the foam seal adhesive tape.Replacing the door lock pin to make with the magnet door absorber can reliably close tight.

The utility model adopts thermal resistance or thermistor as temperature element, cooperates electronic devices such as integrated operational amplifier, unijunction transistor and bidirectional triode thyristor to form thermostat.Temperature control method is the ratio regulative mode.Set up the unexistent off-limit alarm device of general constant incubator in addition.Whole thermostat is contained in separately in the plastics capsule, and circuit theory is seen Fig. 2.

Electric heater of the present utility model does not adopt resistive heater, but adopts common enamel-covered wire or bare copper wire or mild steel wire as raw material, it is bonded at the centre of two layers of paper with glue or chemical paste and makes.

Embodiment: manufacturing power for constant incubator cabinet design as shown in Figure 3 is 300 watts electric heater, non-scald on hand when requiring its work.Supply voltage U=220 volt, heating wire adopts enamel-covered wire or bare copper wire.

Rule of thumb, if being no more than 2 watts, the power that every meter heating wire sends can not scald one's hand with regard to no matter how long touching yet.In view of the above, the length L of the used copper cash of this electric heater should be:

(300 watts)/(2 watts/meter)=150 meters

And its resistance value should be:

R=(220 ²Europe)/300=161

If the resistance per unit length of the copper cash that is adopted is X,

X=(161 Europe)/(150 meters)=1.073 Europe/rice then

The resistance per unit length of No. 38 oil paint envelope curves of tabling look-up as can be known is that 0.991 Europe/rice is more approaching with 1.073 these numbers, and this index of No. 38 high strength enamelled wires is 1.059 Europe/rice, with 1.073 more approaching.For computational methods are described, we have only the oil paint envelope curve at hand at hypothesis, thereby just to have adopted No. 38 oil paint envelope curves be raw material, so actually use the length of enamel-covered wire should be:

(161 Europe)/(0.991 Europe/rice)=162 meters＞150 meters

At the physical dimension of casing shown in Figure 3, consider the normalization problem of product, can manufacture 19 block specifications is 500 * 150mm ²Electric heating piece form an electric heater, every electric heating piece need be with enamel-covered wire:

(162 meters)/19=8.5 meters

The manual making method of electric heating piece is as follows:

Get 500 * 135mm ²One on the brown paper of size is laid on the plank, by position 2 * 56 pieces little unit's nails of nail shown in Figure 4 (computational methods are omitted).After fixing head of a nail pincers are gone, then by trend shown in Figure 4 around hanging up properly enamel-covered wire, with thin paper (preferably black paper is to improve radiance) enamel-covered wire is stuck with paste between two layers of paper subsequently.After dried slightly it is taken off from plank, stick with paste on the both sides that will expose enamel-covered wire with paper slip again, the end of a thread is welded on the softer plastic wire draws, and sticks with paste solder joint with brown paper at last, dries, and an electric heating piece has just been made.Carry out the installation and the debugging of complete machine then.

Piece ground of electric heating piece is bonded at white glue with vinyl on the inwall of casing, and does not paste on last top, goes to the bottom and paste 3, and all the other walls respectively paste 4, so need 19 altogether.Post the back their series connection are welded and draw the lead that connects thermostat.

At the bottom of case, open the hole of 4～8 penholder thicknesses then as air admission hole.Open the air vent that a diameter is about 2 centimetres in the center of top of case, in the hole that a plug in thermometer is driven in the place of about 10 centimetres of distance air vents, the hole of driving a plug in temperature element on the next door of thermometer hole again.

Thermostat is placed on that the case top cover is lived air vent so that heat up rapidly during debugging, glass column mercurial thermometer and temperature probe have been assigned, connect probe lead wire and electric heater lead-in wire, available plug---socket connecting mode, thermoregulation knob is screwed into temperature required scale place, connect the power supply heater and just begin heating, about about 10 minutes temperature of empty van just can reach stable.The same with common constant incubator, the just coarse value of knob scale indication, regulating should be according to mercurial thermometer to the height of fixed temperature.Fig. 5 is the schematic diagram of drawing according to Manufactured model machine, and its casing part (1) is that the GPPS plastic foamboard of 1500 * 750 * 50 common specifications of employing is a primary raw material, is bonded with white glue with vinyl.In order to save material, formulated size as shown in Figure 5.According to size, the position of case inner pallet frame (4), on the chamber interior wall shown position, pasted 20 and be of a size of 440 * 100 electric heating piece (2).8.1 meters of No. 38 oil paint envelope curves of every electric heating piece, the shared enamel-covered wire of complete machine is 162 meters like this, and power just is 300 watts.Bored several pores (5) on the top of case and appropriate location, bottom, temperature controller (3) is placed on the case top usually, and in fact it can adopt the temperature controller of any kind of.

The utility model compares with common constant incubator that to have a cost low, is about 20% of common constant incubator, and is in light weight, temperature-controlled precision height, the advantage such as the temperature inside the box is even, and is safe and reliable, and power consumption is low.

Claims

A kind of constant incubator that includes casing, electric heater, temperature controller is characterized in that its casing adopts rigid foam to make, and its electric heater is copper line or mild steel wire are bonded at the centre of two layers of paper and make.