Automatic temperature control in the greenhouse


(57) Abstract:

The invention relates to horticulture, namely, devices for thermal control and ventilation in buildings protected ground. The problem solved by the invention is improving the efficiency and reliability of the controller, the expansion of the range of possible to use boiling liquids, reduction of weight and size and inertia of thermostat. This is achieved by the fact that the power element entirely executed in the form of a closed elastic metal membrane, forming a variable volume filled with boiling liquid and transmitting force to the drive shaft of the rotary transoms. The surface of the power element blacked out, and the power element is placed inside a passive solar collector formed by perceiving radiation blackened flat surface base, insulated from the shady side of the emission layer, and above him the translucent casing. When active solar radiation heat of the power element in a solar collector may exceed the value of 100oWith that allows you to expand the use of the power element boiling range liquids: usually PIoWith, for example, ethyl ether, to 78oWith, for example, ethyl alcohol. For Northern latitudes with moderate sun this range of liquids can be somewhat narrowed. The solar collector can be installed both inside and outside the greenhouses. 3 Il.

The invention relates to horticulture, namely, devices for thermal control and ventilation in buildings protected ground.

Known regulator thermal regime of the greenhouse along.with. N 1475542, class A 01 G 9/24, Appl. 24.03.87, publ. 30.04.89, bull. N 16.

The main drawback of this controller is the impossibility exception leakage of steam-gas formed during boiling boiling liquids and having a high permeability. Put into the design of the cylinder a number of elements such as rubber and oil (lubricating fluid) ring a few slow process gas leaks, what you can assume from the description and principle of operation of the regulator, which States that the tightness will depend on the spatial position of the working body (plunger up or down):

low tightness in one position and a reliable friend. For gas, acting with equal pressure in all directions, the UTVA the Arnica along.with. N 1435196, class A 01 G 9/24, Appl. 21.01.87, publ. 07.11.88, bull. N 41.

This invention uses the power element Teploobmennik extensions made in the form of a flexible bag filled with boiling liquid.

The disadvantages of this device are:

for vapor boiling liquids among elastic materials, whether special rubber or Plastpolymer, there are no materials with zero permeability. All they "accelerate", and, consequently, their lifespan is very limited.

the device does not allow more efficient use of solar energy to achieve higher heat temperatures, which would increase the range of possible to use boiling liquids.

Closest to the claimed is the automatic temperature control in the greenhouse under patent N 1812932, class A 01 G 9/24, Appl. 12.07.90, publ. 30.04.93, bull. N 16 (prototype).

This control of the temperature in the greenhouse includes a sealed vessel equipped with a flexible diaphragm. Installed on the tank and frame with cover.

The actuator vent sash greenhouse contains a stem attached to the diaphragm, the lever and rod. When heated, the air in the tank due to the solar radiation amount took lichnogo radiation shutter is closed.

The disadvantages of the prototype:

significant heat loss as in the perception of the incident solar energy, and when you save it: first, a heated surface side of the solar radiation is blacked out; secondly, on the shady side of the radiation of the heated tank is not insulated.

air is used as working fluid, like all gases, has a low coefficient of volume expansion, which causes to increase the dimensions of the containers and the associated weight and material consumption.

The problem solved by the claimed invention increase the efficiency and reliability of the controller, the expansion of the range of possible to use boiling liquids, reducing weight and dimensions and inertia of thermostat.

This is achieved in that in the automatic temperature control in the greenhouse, including the power element made in the form of a sealed container of variable volume filled with the working fluid and kinematically linked with swivel transom (in the prototype, called the vent sash) greenhouses, the power element entirely executed in the form of a closed elastic metal membrane, forming volume, filled the element blacked out, and the power element is placed inside a passive solar collector formed by perceiving radiation blackened flat surface base, insulated from the shady side of the radiation, and above him the translucent casing.

In Fig. 1 shows the design of the proposed invention, where Fig.1A power element in the form of a corrugated cylinder (bellows), a closed end, the closed state; Fig.1B of the power element in the form of two closed disk membranes, the status "open", and Fig.2 schematic illustration of the greenhouse and the device located outside of the greenhouse of Fig.3 the same device inside the greenhouse.

The power element 1 is extruded or pressed from thin sheet metal: some grades of steel, brass, bronze, etc. All joints (the ends of the bellows; a flange on the disk membrane) is performed by soldering or welding, providing complete sealing. The thickness of the metal, the design parameters of the elements of the bellows or the disk membrane and the outer dimensions of the power element selected from calculation to achieve the necessary elasticity, stroke length and force on the rod. Within the security element is boiling the flat base 2, which is blackened on all surface 3. The entire outer surface of the power element 1 also chernitsa. In the case of use for the base 2 of a material with high heat conducting performance below the base secures the insulating layer 4.

To the base 2 is fixed and placed on him the translucent cover 5, for example, fiberglass. To the base 2 is mounted and the bracket 6, performing the functions of a guide for movement of the rod 7 and the axis 8 of the lever 9. Items 2, 3, 4, 5 designs form a passive solar collector 10.

Automatic temperature control in the greenhouse works as follows.

When the temperature within the solar collector 10 above the boiling temperature boiling liquid enclosed in the power element 1, the latter moving in pairs, greatly increases in volume, the power element 1 expands along its axis and exerts pressure on the rod 7. Its movement through the lever 9 is rotated around the axis 8, and the rod 11 is transmitted to the rotary transom 12, opening it. When lowering the temperature within the solar collector below the boiling point of the liquid, the process is reversed: a pair of liquid treated in the fluid pressure in si="ptx2">

The solar collector 10 may be installed outside the greenhouses 13 and inside her. In the first case it is attached, for example, by means of bracket 14. In the second case it is installed in the upper part of the greenhouse, in the free access area of solar radiation, and is fastened, for example, on the beam 15.

Absolute temperature in the simplest passive solar collector with the active solar radiation can exceed the value of the 100aboutWith that allows this device to expand the use of the power element boiling range liquids: from commonly used with a boiling point below the 30aboutWith, for example, freon-12 to a number of liquids with a boiling point between 35aboutWith, for example, ethyl ether to 78aboutWith, for example, ethyl alcohol. For Northern latitudes with moderate sun this range of liquids can be somewhat narrowed.

As a working body in this device used the boiling liquid having a clear advantage before any gas, such as air opportunities for volume expansion, which creates conditions for reducing the size and weight of the device. The use of a hermetically sealed elastic metal containers for placement p is the difference of temperature in the solar collector and the greenhouse in a Sunny weather due to the low inertia of the device temperature rise in the solar collector (as well as its decline) will always outpace growth (decline) of temperature in the greenhouse, forcing promptly fired power element and its associated drive swivel transom, thereby eliminating the danger of overheating of the plants during the hot hours of the day, and after the decay heat contributing to the conservation of the past day heat.

The device is simple to manufacture and is reliable in operation. Its use will save owners of protected structures of soil from the daily care on measures to prevent the plants from overheating.

AUTOMATIC TEMPERATURE control IN the GREENHOUSE, containing the power element connected by a rod with swivel transom and filled with the working medium, characterized in that it is equipped with a passive solar collector with flat blacked out and insulated from the bottom side of the base, above which is translucent casing, while the power element is designed as inside a passive solar collector closed elastic metal membrane, the outer surface of which is blacked out, and as a working environment used boiling liquid.


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