Take a look at general drawing incubator . As can be seen from it, the central place in the device takes ... three-liter jar - it is a kind of heat source and heat storage simultaneously. Of course, the water in it is necessary to heat and exercise that you can use any domestic boiler - the best of the smallest capacity of 300 - 400 watts. Attached heater in the bank with a bracket and clamp, cut from any sheet metal thickness of 2 - 3 mm.
The shape and dimensions of the bracket shown in our drawings; clamp sizes are selected depending on the size of the holder of the boiler. Fixing clamp on the bracket - with a pair of M4 screws and nuts. The very same bracket docked to the standard plastic cover such women use for home canning with a pair of M4 screws with nuts and washers. And inside and outside under cover steel washers necessarily underlay rubber washers seal as cover and the bank shall be assembled completely sealed.
In addition to the boiler bracket on the lid and two fixed contact terminals - studs M4 each - with four nuts, a pair of metal and a pair of rubber sealing washers through which voltage is supplied to the boiler.
And the last - passed through the lid metal tube, reaching almost to the bottom of the can. To secure such a tube it is worn tube section with the larger diameter threaded exterior surface, whereupon propaivayutsya joints. The tube is fixed to the cover by a pair of nut and two metal washers, and two rubber.
And one of the main components of the incubator - heat regulator. He also homemade and consists of a plastic housing, which is located inside the same plastic bottle-float.
Thermal regulator housing component, it is assembled from two portions cut from bottles, detergent packages. Note that an upper portion thereof with a slight clearance put on the bottom. On the lateral surface of the upper part - cover - two slotted screw slot that allows you to smoothly move it relative to the bottom to adjust the moment of operation of the thermal control in the neck cover attached homemade switch. His body turned from any insulator eg, PCB, or Plexiglas; side terminal screws threaded MH desirable to use copper or brass, of the same materials and central contact - M4 threaded screw. Last screwed into the pusher, also carved out of any insulating material.
In the bottom of the thermal regulator secured passage fitting assembled by soldering two copper pipes - external M8 thread on its outer surface and an inner diameter of 5x0, 5 mm.
The float is located within the housing - a plastic bottle, the diameter of which must be such as to desyatimillimetrovy clearance between the inner diameter and the lower part of the float housing.
Now you can make a test assembly and to verify the performance of the instrument on.
To start bank heat source for two-thirds filled with water and it is planted densely cover assembly. Next, using a rubber or polyvinyl tube fitting on the body heat regulator is connected to the fitting on the lid of the jar-heat generator. Immersion heater is connected to the same network via the limit switch contacts, which are initially in the normally closed position.
So, through the thermal relay contacts kettle plugged in and begins to heat the water in the pot. Of course, the air is heated and, located above the water surface in the cavity of a can. Since the bank is closed hermetically going up air pressure begins to squeeze out the water from the water intake tube banks in body heat regulator. In this case the float rises and eventually regard pusher lid limit switch, while the circuit is broken. Then the water in the pot begins to cool, and cools the air above its surface. Water from the body heat regulator sucked back into the jar-heat source. Float drops as long as the limit switch is not closed again with Kettle again begins to heat the water in the pot. That`s the whole complete cycle of the heat source.
Verify that the device can begin final assembly of the incubator.
For the inner shell of the incubator is best to pick an aluminum pot - its internal diameter of about 300 mm and a height of about 320 mm. At the bottom of the pan and cover nasverlivayutsya few holes with a diameter of 10 - 12 mm, through which the cavity ventilation incubator.
Pan is placed in the casing, which in the simplest case can be made of corrugated cardboard. However, better still make housing more durable materials - plywood or hardboard.
Space between the casing and the pan should be filled by any insulating material - foam packaging or construction, small chips, sawdust or chaff to a bottom of the housing provides an inlet vent - for example, such as shown in the drawing of the general form - performed by a pair of rails and veneer.
Housing cover just about to as the body and of the same materials. In the center of the cover is glued cardboard ring forming exhaust vent.
Lodgements under the eggs are cut from plywood or plastic of any thickness 3 - 4 mm. They are fixed by means of four threaded studs on the plywood or plastic discs with a diameter of about 200 mm, as shown in FIG. At the bottom of the pan-housing are four water tanks, which allow to maintain optimal humidity in the incubator chamber.
Gathering incubator, we recommend you to devote a few days setting up the product. To do so, armed with conventional medical thermometer, placing it in the area of finding eggs. In the ideal case, and nice to have a hygrometer - for humidity control. Baseline data for the following adjustments: temperature - within the range of 37,2 ° to 39,5 °, -55 -70% humidity. If the temperature inside the incubator is insufficient, you must move the control cover up and make sure the temperature in the incubator for one or two cycles of heating. At elevated temperatures, together with the lid falls down limit switch followed by temperature control. In the process of debugging the thermal relay on his body can be applied grading and further at the temperature control guided by the experimentally obtained data incubation temperatures depending on the angle of rotation of the lid thermal regulator.
If the position of the float in the recommended temperature range does not provide trip "trailer", it must be retrieved from bulk material using any - such as dry sand.
Chicken eggs are placed in two lodgment, a dozen each. During incubation, we recommend periodically at least once a day to turn the eggs, as it usually does mother hen. Should not be afraid that when you turn the temperature inside the incubator eggs can fall - naturally it happens all the time when a mother hen leaves the nest, so that at least a snack.
It should be noted that home incubator of this type is a kind of thermal battery. Therefore, he is not afraid even long interruptions in the power supply - Incubator thermos for a long time keep the water temperature constant in the bank. But if the power supply in your house "passed out" for a long time, and it does not matter: it is enough to replace the bank on the other heat source, it poured with hot water - and a few hours incubator will properly function as a mother hen. You only need to advance further in the process of debugging the device just in case measure the temperature of the water in the bank: immediately after heat boiler controller disables the spare capacity should pour water at the same temperature.