JPH0430811B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an air supply/exhaust port device suitable for livestock housing such as pigs, chickens, and cows.

Conventional technology and problems The temperature inside the livestock barn is determined by the outside temperature, sensible heat from the livestock,
Although it fluctuates due to latent heat, it is desirable to keep the temperature as constant as possible throughout the year. By the way, in order to control the temperature inside livestock barns, from the viewpoint of cost and maintenance management, conventional ventilation methods using fans that utilize outside temperature or humidity have often been adopted (for example, in summer, large amounts of air are blown). (to remove latent heat). In this fan ventilation system, a ventilation fan is installed in the air passage that communicates the inside and outside of the livestock barn, and the fan is used to ventilate the inside of the livestock barn. A (see Fig. 8) or a shutter type opening/closing lid (see Fig. 9) is provided.

However, since the sliding plate type lid is opened and closed manually, the degree of opening and closing can only be done as a guideline, and it is not possible to adequately control the required ventilation amount and temperature. When the fan motor rotation speed is automatically controlled to maintain a constant temperature in a livestock barn, it is necessary to make the opening/closing width of the opening/closing lid follow the motor rotation speed, but this requires a complex interlocking configuration. In addition, since the shutter-type opening/closing lid can only open and close, there were other drawbacks such as the inability to adjust the temperature in response to changes in air volume and speed.

Means for Solving the Problems Therefore, the present invention provides a ventilation fan in an air passage communicating between the inside of the livestock barn and the outside of the livestock barn, and in which the interior of the livestock barn is ventilated by the fan. Split lids for adjusting air volume are each pivoted in the air passage via a fulcrum shaft so that they can be opened and closed in a double-door shape, and a weight for balance is provided at the opening/closing base end of each split lid. A permanent magnet is provided on the opening/closing tip side of the body, and a magnetic material is provided on the opening/closing tip side of the other lid, and the fulcrum shaft is provided at a position slightly offset from the center of gravity G of each lid in the opening direction. This is an attempt to solve the above problems.

Function When the ventilation fan is started, the air movement (suction or pressure) in the air passage causes the divided lids to overcome the attraction force of the permanent magnet and open in a double-door shape around the fulcrum axis. The degree of opening of the divided lid body varies depending on the strength of the wind force, and when the wind force is held constant, the degree of opening of the divided lid body is maintained at the same degree. In addition, even when the wind power is weakened, the lid slowly rotates in the closing direction without being affected by wind resistance or the weight of the lid, and when the fan is stopped, the lid rotates to the horizontal position and the split lid is magnetized. It is held in the closed state by a moderate adsorption force.

Embodiment The drawing shows a pigpen A as an example of a livestock barn. Figure 1 is a vertical front view of pigsty A. Insulating material 3 is placed over the entire wall surface 1 and ceiling surface 2 of pigsty A, forming a windowless pigsty A with a highly airtight closed room structure. There is. Inside the pigpen A, a large number of pig breeding cells 4 are arranged in parallel in the longitudinal direction (in the direction of the ridge). Although not shown in the diagram, in addition to the fattening shed, there are a weaning shed, a farrowing shed, and a mating/pregnancy shed, etc., making it possible to centrally and efficiently manage the health and breeding of pigs. There is.

5 is a ventilation fan (roof fan) placed on the top of the roof 6 of pigsty A at predetermined intervals along the ridge direction.
5a is the cover, 5b is the fan drive motor,
7 is an exhaust port, 8 is an intake port, and 8a is a shielding plate.

By the way, the drive motor 5b of the fan 5 is configured to control the motor rotation speed by frequency control in order to maintain the inside of the pigsty A at a constant temperature, and the necessary amount of ventilation is always supplied to the inside of the pigsty A. It's becoming like that.

9 is a vent opened in the ceiling surface 2;
and the fan 5 are communicated via a rectangular tube-shaped wind tunnel 10. 11 is a heat insulating material.

Reference numerals 12 and 12a designate split lids for adjusting the air volume provided in the air passage a near the ventilation fan 5, and each is pivotally connected via a fulcrum shaft 13 so as to be openable and closable in a double-door shape. The drawing shows the divided lid bodies 12, 12a attached to a vent hole 9 provided on the ceiling surface 2. The split lids 12, 12a are made of a relatively lightweight member such as a plywood board, a synthetic resin board, or aluminum, and have a heat insulating material inside.
4 is loaded. And each divided lid body 12,
A weight 15 for balance is installed inside the opening/closing proximal end side of 12a. In addition, a permanent magnet 16 having an appropriate adsorption force is placed on the opening/closing tip side of one lid 12.
A magnetic body 17 such as an iron plate is disposed on the opening/closing tip side of the other lid 12a.

By the way, the fulcrum shaft 13 of the split lids 12, 12a is provided at a position slightly offset (W dimension) from the center of gravity G of each lid 12, 12a in the opening direction (upward in the illustrated example). The mass balance of 12 and 12a is set to be as small as possible. Therefore, even if the rotational speed of the fan motor 5b is small and therefore the wind force is small, as long as there is enough force to overcome the attraction force of the magnet 16, the opening can be smoothly opened upward. When the fan motor 5b is fully rotated, the divided lids 12 and 12a are in a fully open state standing approximately vertically around the fulcrum shaft 13, and when the fan motor 5b is rotated by 50%, they are in a half-open state, and in a no-wind state with the motor 5b stopped. When the split lids 12 and 12a are closed, they are kept in the closed state by the moderate adhesion force of the magnet 16 to prevent them from opening by themselves due to external strong winds, etc. is configured to do so.

A fifth portion is provided on the lower surface of the opening/closing tip side of the split lid body 12, 12a.
The lid body 12, 1 is provided with an inclined portion b as shown in the figure.
It may be configured such that the wind pressure hits the inclined portion b even when the device 2a stands up.

Although not shown in the figure, there are a plurality of temperature sensors (for example, sensors that operate when sensing temperatures lower than 22°C) connected to the fan motor 5b in the pigpen A.
(one that operates between 22°C and 25°C, one that operates at a higher temperature than 25°C, etc.), and the rotational speed of the fan motor 5b is always automatically set to the optimum rotational speed by frequency control in response to the high or low temperature of the room temperature. (inverter control).

18 is a lid receiving plate attached to the 9th part of the ventilation hole,
This receiving plate 18 supports the lids 12, 12a from below when the lids are closed, and also cools the gap between the lids 12, 12a and the vent 9 to further improve airtightness.

In the above embodiment, a so-called negative pressure type (exhaust type) ventilation method using an exhaust fan as the ventilation fan 5 was described. ) can also be used for ventilation methods. In the case of a positive pressure system, the split lids 12, 12a are opened downward (see FIG. 7). Furthermore, the positional relationship between the fan 5 and the divided lid bodies 12, 12a can be reversed.

In the above configuration, when the ventilation fan 5 is started, the inside of the wind tunnel 10 becomes negative pressure due to the suction force of the fan 5.
6 and rotate upwards around the fulcrum shafts 13 to open the vents 9.
Dirty air inside the pigsty A passes through the wind tunnel 10 and is discharged above the roof 6 from the exhaust port 7, while outside air is sucked into the pigsty A from the intake port 8 to uniformly fill the inside of the pigsty with fresh air. .

By the way, the temperature inside the pigsty A is detected by a temperature sensor, and the rotation speed of the fan motor 5b is controlled based on the detection result (for example, in the summer, the rotation speed of the fan motor 5b is increased and a large amount of air is stored inside the pigsty A). (In winter, the outside temperature is lower than the room temperature, so the motor rotation speed is lowered to allow the animal to adjust to the room temperature and ventilate the room as slowly as possible.) The temperature is kept at a constant temperature throughout the year (for example, 22°C for piglets). The opening degree of the split lid body is automatically adjusted in accordance with the wind force that changes as the motor rotation speed increases and decreases, and the opening degree is maintained by the wind force passing through the wind tunnel 10 as long as the motor 5b is continuously rotated. Therefore, no power or special opening/closing mechanism is required to open and close the lid. Moreover, the fulcrum shaft 13 of each divided lid body 12, 12a is
Since the split lids 12, 12a are provided at a position slightly offset by the dimension w in the opening direction from the center of gravity G of the fan motor 5b, the split lids 12, 12a
The fulcrum shaft 13 does not close suddenly due to the weight of a.
Rotate slowly in the opening/closing direction around magnet 1.
Since the vent 9 is reliably closed in combination with the suction force of the vent 9, even if a strong wind occurs outside, the inside of the wind tunnel 10 does not become negative pressure, so the lids 12, 12a do not open unexpectedly. Therefore, the fan motor 5b
The air inside the pigpen A will not leak outside through the wind tunnel 10 when the pigpen A is stopped.

Note that the present invention can also be applied to an air supply/exhaust port device in a constant temperature storage room or the like.

Effects of the Invention As described above, the present invention provides a ventilation fan provided in an air passage communicating between the inside of the livestock barn and the outside of the livestock housing, and in which the interior of the livestock barn is ventilated by the fan. A split lid body for adjusting the air volume is pivoted inside the lid so that it can be opened and closed freely in a double-door shape via a fulcrum shaft, and a weight for balance is provided at the opening/closing base end of each split lid body. A permanent magnet is provided on the opening/closing tip side, and a magnetic body is provided on the opening/closing tip side of the other lid, and the fulcrum shaft is provided at a position slightly offset from the center of gravity G of each lid in the opening direction. The split lid opens automatically when the ventilation fan starts, and the opening of the split lid is automatically adjusted and maintained at the appropriate opening depending on the wind force, which improves ventilation in the livestock barn and its effects. The temperature can always be adjusted accurately. In addition, when the fan stops, the split lid slowly rotates in the closing direction to securely close the air passage, which not only reduces the impact when closing the lid, but also prevents the lid from accidentally closing due to strong winds. This prevents the lid from opening, and there is no need to provide a separate opening/closing mechanism or opening adjustment mechanism for the lid.
It is possible to easily construct a split lid body by modifying the existing sliding plate, and the structure is simple and maintenance and inspection can be easily performed.The construction cost of the livestock barn can also be reduced, among other effects. play.

[Brief explanation of drawings]

The drawings show an embodiment of the supply/exhaust port device for a livestock barn according to the present invention, in which FIG. 1 is a vertical sectional front view of a livestock barn equipped with the present invention, FIG. Figure 3A is an enlarged front view of the split lid, Figure 3B
is a perspective view of the split lid body, FIG. 4 is a bottom view of the split lid attachment part, and FIG. 5 is a front view showing another example of the split lid body.
FIG. 6 is an explanatory diagram of the function of the split lid body, FIG. 7 is a longitudinal sectional front view of the present invention installed in a livestock barn that adopts the intake type ventilation method, and FIGS. 8 and 9 are respectively views of a conventional livestock barn. FIG. 3 is a longitudinal sectional front view of the air supply/exhaust port device. In the figure, 5 is a ventilation fan, 5b is a fan drive motor, 7 is an exhaust port, 8 is an intake port, 9 is a ventilation port,
10 is a wind tunnel, 12 and 12a are divided lids, 13 is a fulcrum shaft, 15 is a weight, 16 is a permanent magnet, 17 is a magnetic body, G is the center of gravity position of the lid, and a is an air path.

Claims (1)

[Claims] 1. In the case where a ventilation fan is installed in the air passage communicating between the inside of the livestock house and the outside of the livestock house, and the inside of the livestock house is ventilated by the fan, a split lid for adjusting the air volume is installed in the air passage near the fan. Each split lid is pivoted to open and close in a double-door shape via a fulcrum shaft, and a weight for balance is provided on the opening/closing base end of each split lid, and a permanent magnet is placed on the opening/closing tip of one lid, while the other An air supply/exhaust port device for a livestock barn, characterized in that a magnetic body is disposed on the opening/closing tip side of each lid, and the fulcrum shaft is provided at a position slightly offset from the center of gravity G of each lid in the opening direction. .