RU2369805C1 - Air supply unit of natural ventilation system in livestock building - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: unit is designed for the natural ventilation system and can be used in livestock buildings. The unit comprises an air intake fitting set in the wall opening and connected to the air distribution channel inside the building; the air intake fitting is equipped by a control valve which is made as two flaps directed to the air intake fitting inlet and fixed at the shaft inside the air intake fitting by a hinge; the flaps are interconnected by a calibrated extension spring. Stoppers are rigidly fixed at the inner sides of the two air intake fitting walls; the clear section of the air intake fitting inlet is equal to the cross section of the air distribution channel inside the building and the air intake fitting casing is made as a convergent nozzle. The unit allows for the automation of the livestock building natural ventilation depending on the force of the outdoor wind.

EFFECT: simple design and high reliability.

3 cl, 2 dwg

Description

The invention relates to the field of agriculture, namely, natural ventilation devices, and can be used in livestock buildings.

Known inflow device of the natural ventilation system of the livestock building, consisting of a hole in the wall of the room, an air intake pipe, a control valve with a drive (International Agricultural Journal, No. 6, 1985, p. 79).

The disadvantages of this device are:

1) there is no provision for immediate closure of the valve of the air intake pipe in the event of a sudden increase in wind to values higher than the calculated value;

2) there is no provision for the immediate opening of the valve of the intake pipe after reducing the wind pressure to the calculated values;

3) the need to apply manual exposure to perform the regulation of the operating modes of the device leads to increased operating costs.

If the valve of the air intake pipe is not closed on the windward side of the livestock building, in case of a sudden increase in wind above the calculated values, an excessive amount of outside air is inflated into the room, which in the cold season causes the animals to be supercooling, both by increasing the speed of air movement and by lowering internal air temperature. After reducing the wind force to the calculated values, it is also necessary to immediately open the valve of the air intake pipe of the ventilation system to ensure the necessary level of air exchange. Hypothermia of animals due to excessive air exchange, as well as a deficit in the volume of ventilation air supply is unacceptable according to zoohygienic requirements.

Also known is the natural ventilation system of the livestock building according to the patent 2282110 of the Russian Federation, class. F24F 7/04.

In the natural ventilation system of the livestock building with walls, windows, a roof, exhaust ventilation system on the roof, an external air supply device consisting of air intake pipes located in the walls and connected to the air distribution channels inside the room under the ceiling (roof), air distribution channels directly against the wall equipped with a catchment groove (collar), and the intake pipes at the inlet are equipped with control valves.

A disadvantage of the known device is that the known device has no means of automatically acting on the control valve in order to immediately close and then open the control valve with a sudden increase or decrease in wind compared to its calculated values, which reduces its effectiveness.

The objective of the invention is the automation of the process of controlling the operating modes of the supply device of the natural ventilation system.

In the supply device of the natural ventilation system of the livestock building with walls, a roof, an exhaust ventilation system, an external air supply device consisting of an air intake pipe located in the wall opening and connected to the air distribution channel inside the room, the air intake pipe at the inlet is equipped with a control valve, while regulating the valve is made in the form of two flaps directed to the inlet of the intake pipe and pivotally mounted on the shaft, rigidly installed om inside the air intake pipe, with the flap are interconnected by a calibrated spring tension, on the inner sides of two opposing walls of the air intake tube is rigidly mounted abutments; The “live section” of the inlet pipe at the inlet is equal to the cross section of the air distribution channel inside the room, and the body of the intake pipe is made in the form of a confuser.

New significant features:

1) the control valve is made in the form of two flaps directed to the inlet of the air intake pipe and pivotally mounted on the shaft;

2) the shaft is rigidly installed inside the air inlet, the flaps are interconnected, the valve flaps on the inlet side of the air inlet are connected by a calibrated tension spring, the stops are rigidly mounted on the inner sides of the two opposite walls of the air inlet;

3) the "live section" of the inlet pipe at the inlet is equal to the cross section of the air distribution channel inside the room;

4) the body of the intake pipe is made in the form of a confuser.

The listed new essential features in conjunction with the known ones allow to obtain a technical result in all cases to which the requested amount of legal protection applies.

The design of the control valve, which consists of two V-shaped leaves, pivotally fixed at one end on a fixed shaft located inside the air intake pipe, with the other ends freely directed to the inlet of the air intake pipe towards the supply air stream with the possibility of their opening from the maximum approach, limited by the latches to maximally diluted position limited by the walls of the air intake pipe, allows you to use the force of the incoming air flow (wind ) to regulate the volume of outdoor air into the room. In the position of maximum closure of the valve flaps, limited by the clamps, the "live section" of the intake pipe at the inlet has a maximum value and corresponds to the volume of external air supply into the room at the calculated values of the wind force.

When the wind force is amplified on the valve flaps, the influence of the supply air flow increases and the flaps move towards the outer walls of the air intake pipe, thereby reducing the "living section" for air passage until it is completely closed. Accordingly, the volume of supply of outdoor air is reduced until the supply is completely stopped.

The valve flaps on the inlet side of the intake pipe are connected by a calibrated tension spring. When the wind force acting on the valve flaps exceeds the tension force of the calibrated spring, the valve flaps diverge, reducing the "living section" for the passage of outside air until the "living section" completely overlaps. When weakening the wind force to the calculated values, the force of the calibrated spring overcomes the wind force and returns the flaps to the maximum opening position of the "live section" of the supply pipe, and thereby setting the volume of external air supply in the calculated volume.

The implementation of the intake pipe in the form of a confuser allows you to minimize friction losses of the air flow during the transition from the inlet section of the intake pipe to the cross section of the air distribution channel. The equality of the "live section" of the intake pipe at the inlet and the "live section" of the air distribution channel ensures a constant flow rate of the supply air in the supply device of the natural ventilation system.

The use of the proposed intake device in the natural ventilation systems of livestock buildings eliminates the negative impact of the external wind force above the calculated value on the characteristics of the air environment inside the livestock building, because overcooling of animals is excluded by increased air mobility and lowering its temperature without the influence of maintenance personnel in automatic mode with the simplicity of a constructive solution, which positively affects the reliability of the natural ventilation system. The device does not require large expenditures either for manufacturing or for operation.

Figure 1 schematically shows the supply device of the livestock building, a longitudinal section; figure 2 shows the frontal projection of the device.

The supply device of the livestock building with the wall 1 and the hole in it 2 consists of an air intake pipe 3, an air distribution channel 4, at the inlet of the air intake pipe 3, made in the form of a confuser, a control valve is installed, consisting of two wings 5, pivotally mounted on a fixed shaft 6, located inside the air intake pipe 3, the flaps 5 of the control valve are directed to the inlet of the air intake pipe 3 with the possibility of their disclosure from the maximum approach, limited by stops 7, about the maximally diluted position bounded by the walls of the intake pipe 3, the valve flaps 5 from the inlet side of the intake pipe 3 are connected by a calibrated tension spring 8, the area of the supply duct 4 is equal to the area of the "live section" of the intake pipe 3 at the inlet at the maximum approximation of the shutters 5 of the control valve, limited clips 7.

The supply device of the natural ventilation system of the livestock building works as follows.

When the estimated wind load, the valves 5 of the control valve under the influence of a calibrated tension spring 8 are in the position of maximum rapprochement, limited by stops 7. External air through the intake pipe 3 enters the air distribution channel 4 and then into the livestock building. When the wind force is increased above the calculated value, the flaps of the valve 5 overcome the force of the tension spring 8 and diverge, reducing the "live section" of the intake pipe 3, which leads to a decrease in the volume of outdoor air. When the wind force is significantly higher than the calculated value, the flaps of the valve 5 are in contact with the inner surface of the walls of the air intake pipe 3, thereby the "living section" of the inlet of the air intake pipe is almost completely blocked, and accordingly, the supply of external air into the room through the supply device is stopped. Ventilation of a room in a situation where the control valves 5 of the supply devices of the natural ventilation system of the livestock building are closed on the windward side is carried out by air infiltration through the porch of the building envelope on the windward side of the room, as well as through the supply devices of the natural ventilation systems on the leeward side of the room, if provided when designing a natural ventilation system.

When weakening the wind force, the tension spring 8 acts on the valve flaps 5 and returns them to their original position, limited by stops 7, thereby providing external air in the design mode.

Claims (3)

1. The intake device of the natural ventilation system of the livestock building with walls, a roof, an exhaust ventilation system, an external air supply device consisting of an air intake pipe located in the wall opening and connected to the air distribution channel inside the room, the air intake pipe at the inlet is equipped with a control valve, characterized in that the control valve is made in the form of two flaps directed to the inlet of the intake pipe and pivotally mounted on the shaft, gesture to those installed inside the air intake pipe, while the flaps are interconnected by a calibrated tension spring, the stops are rigidly mounted on the inner sides of the two opposite walls of the air intake pipe. 2. The supply device of the natural ventilation system of the livestock building according to claim 1, characterized in that the "live section" of the intake pipe at the inlet is equal to the cross section of the air distribution channel inside the room. 3. The supply device of the natural ventilation system of the livestock building according to claim 1, characterized in that the housing of the air intake pipe is made in the form of a confuser.

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