JPH0537147Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention mainly relates to ventilation fans used in agricultural greenhouses.

[Conventional technology and its problems]

Ventilation fans are widely used for temperature control and ventilation in agricultural greenhouses. Ventilation fans used in agricultural greenhouses are turned on when the temperature inside the greenhouse becomes high.
When the temperature inside the greenhouse drops, the system stops operating and adjusts the temperature within the greenhouse to a certain range. Conventional ventilation fans control the operation of the motor,
Adjusting exhaust conditions. When the motor is operated, the damper opens due to wind pressure, forcing ventilation.
The damper is configured to automatically close under its own weight when the motor is stopped. In conventional ventilation fans, the damper is opened and closed by wind pressure, so the damper opening and closing mechanism can be simplified. However, in a ventilation fan with this structure, a draft flows in and out when the damper is closed. This is due to the fact that the damper has a structure that allows it to be opened and closed easily by wind pressure. Drafts increase the running costs of agricultural greenhouses. This is because cold outdoor air flows in from the blocked ventilation fan, and warm air inside the house flows out. For agricultural greenhouses, how to reduce running costs is extremely important. This is to reduce the manufacturing cost of agricultural products. To prevent drafts from entering from ventilation fans,
A cylindrical synthetic resin sheet is attached to the outlet side of a ventilation fan. When the ventilation fan is operated, the synthetic resin cylinder expands into a cylindrical shape like a windsock to let air through, and when the ventilation fan is stopped, it hangs down and blocks the outlet side of the ventilation fan. Therefore, the synthetic resin sheet cylindrical body can prevent drafts from entering from the ventilation fan. However, this synthetic resin sheet has the drawback of easily causing failure of the ventilation fan. The synthetic resin sheet may become entangled with the ventilation fan or damper, or
This is because if this is installed on the indoor side of an agricultural greenhouse, it will get tangled with wiring, etc. If the synthetic resin sheet gets tangled, it will not open into a cylindrical shape even when the ventilation fan is operated, and if it gets tangled around the fan, there will be problems such as burnout of the motor. Failure of ventilation fans in agricultural greenhouses can lead to serious problems. This is because the crops inside will suffer irreversible temperature damage in just a few hours. Furthermore, conventional ventilation fans that open and close dampers using the wind pressure of the fan have the disadvantage that the efficiency of the fan decreases due to the opening of the damper. This is because the damper is held open by the fan.

[Purpose of this idea]

This invention was developed with the aim of solving these drawbacks of conventional ventilation fans, and the important purpose of this invention is to provide a ventilation fan that can effectively prevent drafts from entering. . Another important object of this invention is to provide a ventilation fan that can significantly reduce running costs when used in agricultural greenhouses. Furthermore, another important objective of this invention is to provide a ventilation fan that is less likely to break down, requires less maintenance, and can be used with peace of mind.

[Means to solve conventional problems]

The ventilation fan of this invention has the following configuration in order to achieve the above-mentioned purpose. (a) The ventilation fan consists of frame 1, damper 2, and fan 3.
, motor 4 , upper lid 5 , damper opening/closing means 6 , upper lid opening/closing means 7 , and temperature sensor 8
and a control means 9. (b) The frame 1 is assembled into a rectangular shape by connecting a vertical frame 1A and a horizontal frame 1B. (c) The damper 2 is composed of a plurality of blades. (d) The blades are extended horizontally and rotatably attached to the vertical frame 1 at regular intervals so that they close under their own weight.
Connected to A. (e) The damper 2 is not opened and closed by the wind pressure of the fan 3, but is connected to the damper opening and closing means 6 and is forcibly opened and closed. (f) The fan 3 is connected to a motor 4 and is rotatably disposed within the frame 1. (g) The upper lid 5 closes the gap between the damper 2 and the vertical frame 1A when the damper 2 is closed.
They are located at the ends of the blades of the damper 2, and are arranged parallel to the vertical frame 1A. (h) The upper lid 5 is rotatably connected to the frame 1 about an axis parallel to the vertical frame 1A. (i) In the closing position, the upper lid 5 is arranged to close the vertical frame 1A and the end front surface of the damper blade. (j) The upper lid opening/closing means 7 is connected to the upper lid 5, and the upper lid 5 is opened/closed by the upper lid opening/closing means 7. (k) the temperature sensor 8 is connected to the control means 9;
The control means 9 controls the operation of the motor 4 and the opening/closing states of the damper opening/closing means 6 and the top lid opening/closing means 7.

[effect]

The ventilation fan of this invention has a damper 2 and an upper lid 5.
The opening and closing of the fan 3 can be controlled separately from the rotation of the fan 3. This is because the damper 2 and the upper lid 5 are forcibly opened and closed by the opening/closing means. Table 1 shows preferred operating conditions for a ventilation fan with this structure.

[Table] As shown in this table, the ventilation fan of this invention can be operated under the following conditions. When the room temperature is below 26°C, the damper 2 and the upper cover 5 are closed and the operation of the motor 4 is stopped. In this state, cold outside air is not allowed to flow in to keep the agricultural greenhouse warm. When the indoor temperature rises to 26 to 30°C, the damper 2 and the top cover 5 are opened and the motor 4 is not operated. In this state, the air inside the agricultural house naturally flows out to the outside, and the outside air naturally flows in. In this state, the air inside the agricultural house is not forcibly ventilated, so that the indoor air temperature is gently prevented from rising. Furthermore, when the indoor air temperature rises to 30℃ or higher, with the damper 2 and the top cover 5 open,
Operate motor 4 to forcibly ventilate indoor air. In this condition, a large amount of air is vented. When the motor 4 is operated and the indoor air temperature drops to 26 to 30°C, the motor 4 is also stopped, and the damper 2 and the upper cover 5 are opened.
Switched to natural ventilation. In the above specific example, the opening/closing temperature of the damper 2 and the top cover 5 is 26°C, and the operating temperature of the motor 4 is 30°C.
However, it goes without saying that this temperature is adjusted to the optimum value depending on the type of crops grown in the greenhouse or the purpose of the ventilation fan. The opening and closing operations of the damper 2 and the upper lid 5 are as follows. Damper opening/closing means 6 shown in FIGS. 2 and 3
is equipped with a solenoid 10 and a connecting rod 11. When the solenoid 10 is energized and it pulls down the connecting rod 11, the damper 2 is opened. This is because the connecting rod 11 pulls down the rear end of the damper 2. When the energization of the solenoid 10 is stopped, the connecting rod 11 and the plunger of the solenoid 10 are pulled up by the weight of the damper 2, and the damper 2 is closed. As shown in FIGS. 1 and 3, the upper lid 5 has
It is opened and closed by a deceleration motor 12 which is the top lid opening/closing means 7. The output shaft of the deceleration motor 12 is connected to the upper lid 5.
The upper lid 5 is connected to a rotating shaft 13 of the rotating shaft 13, and the upper lid 5 is fixed to the rotating shaft 13. When the damper 2 is closed, the upper lid 5 is pressed against the outer surface of the damper 2, as shown in FIG. When the damper 2 is opened, the top cover 5 is opened as shown by the chain line in FIG. The upper lid 5 is opened and closed with the damper 2 closed. That is, the upper lid 5 is opened before the damper 2 is opened, and after the damper 2 is closed, the upper lid 5 is closed. Although both the upper lid 5 and the damper 2 are opened and closed,
The opening and closing of the upper lid 5 and the damper 2 and the operation of the fan motor 4 are controlled by a control means 9. The control means 9 controls the upper lid 5 and the damper opening/closing means 6 using the input signal from the temperature sensor 8, and
Controls the operation of the fan motor 4. In this way, the ventilation fan of this invention has a closed damper closed on both sides by an upper cover. Therefore, when a ventilation fan with this structure is used in an agricultural greenhouse, it has the advantage of significantly reducing the running cost required for heating the agricultural greenhouse. This is because air flowing into or out of the gap between the damper and the frame can be effectively prevented. Furthermore, the ventilation fan of this invention opens and closes the damper and the top cover using a dedicated opening/closing means instead of using wind pressure, so it has the advantage of saving electricity costs for the ventilation fan and gradually adjusting the indoor temperature. This is because the damper and the top cover can be opened without operating the motor to suppress the rise in indoor temperature. In other words,
This is because even if a conventional ventilation fan is in operation, the ventilation fan of this invention allows the motor to be stopped. Combined with the short operating time of the motor and the ability to reduce temperature loss in agricultural greenhouses, this ventilation fan has the advantage of significantly reducing overall running costs, thereby lowering the manufacturing cost of agricultural products. There is. Furthermore, the ventilation fan of this invention closes the outside of the damper with the top cover to prevent drafts between the damper and the frame, so there is no need to attach a synthetic resin sheet or the like to the outlet side of the ventilation fan. It also has the advantage of greatly reducing failures caused by synthetic resin sheets and simplifying maintenance.

[Preferred embodiment]

An embodiment of this invention will be described below based on the drawings. However, the embodiment shown below is an example of a ventilation fan for embodying the technical idea of this invention, and the ventilation fan of this invention has the material, shape, structure, and arrangement of the component parts as shown below. It is not specific. Various changes can be made to the ventilation fan of this invention within the scope of the claims for utility model registration. Furthermore, in order to make it easier to understand the scope of claims for utility model registration, this specification includes numbers corresponding to the members shown in the examples in the "column of claims for utility model registration",
Additional notes are added to the members shown in the "Column of Means for Solving Conventional Problems" and the "Column of Functions and Effects."
However, the members shown in the scope of the utility model registration claims are by no means limited to the members of the embodiments. The ventilation fan shown in FIGS. 1 to 4 has a frame 1,
Damper 2, fan 3, motor 4, top lid 5, damper opening/closing means 6, and top lid opening/closing means 7
, a temperature sensor 8 , and a control means 9 . The frame 1 is for fixing the ventilation fan to the building, and is constructed in a rectangular shape by connecting a vertical frame 1A and a horizontal frame 1B. The damper 2 is provided to open and close an opening in the frame 1. The damper 2 is composed of a plurality of blades that are loose in the open state. The blades are extended horizontally and rotatably attached to the vertical frame 1A at regular intervals so that they can be closed by their own weight.
is connected to. As shown in FIGS. 1 and 2, the blades have upper ends of both ends rotatably connected to the vertical frame 1A. As shown in the horizontal cross-sectional view of Figure 3, both ends of the blade are bent at 90 degrees. The feather is
The vertical frame 1
Connected to A. In FIG. 2, a heat insulating material 15 is placed under the blade. The heat insulating material 15 reduces thermal energy released to the outside when the blades are closed. This is because the cross-sectional view reduces heat conduction through the blades. The blades are not opened and closed by the wind pressure of the fan 3, but are connected to the damper opening and closing means 6, and are forcibly opened and closed. The insulation opening/closing means shown in FIGS. 2 and 3 includes a connecting rod 11 and a solenoid 10. As shown in FIGS. The connecting rod 11 is connected to the rear end of each blade via a pin 16, and is provided inside the vertical frame 1A so as to be vertically movable. Connecting rod 1
1 is pulled by the solenoid 10 and is forcibly lowered. Therefore, the connecting rod 11 is connected to the arm 17.
protrudes backward, and a solenoid 1 is attached to this arm 17.
0 plunger is connected. When energized, the solenoid 10 retracts the plunger, lowering the connecting rod 11 and opening the vanes. When the solenoid 10 is de-energized, the blades descend under their own weight and close. At this time, the connecting rod 11 and the plunger of the solenoid 10 are pulled up by the weight of the blade. Therefore, the damper opening/closing means 6 having this structure can forcibly open/close the damper 2 by controlling the energization state of the solenoid 10. The fan 3 is connected to a motor 4 and rotatably disposed within the frame 1. The fan 3 is directly fixed to the output shaft of the motor 4 or connected to the output shaft of the motor 4 via a pulley or a belt. The upper lid 5 closes the gap between the damper 2 and the vertical frame 1A when the damper 2 is closed, and is located at the end of the blade of the damper 2 and arranged parallel to the vertical frame 1A. ing. As shown in FIGS. 1 and 2, the upper lid 5 is rotatably connected to the vertical frame 1A about a rotation axis parallel to the vertical frame 1A. Further, the upper lid 5 is arranged in a closed position shown in FIG. 3 so as to close the vertical frame 1A and the front surface of the end of the damper blade. The upper end of the rotating shaft 13 of the top lid is supported by the upper end of the vertical frame 1A via a bearing, and the lower end of the rotating shaft 13 is
It is connected to the output shaft of a deceleration motor 12, which is the top cover opening/closing means 7. In the ventilation fan shown in FIGS. 2 and 3, the damper 2 and the opening/closing means for the upper lid 5 are composed of a solenoid 10 and a deceleration motor 12. However, this idea does not specify the opening/closing means to this structure;
For example, it is also possible to open and close the damper 2 and the top cover 5 using one solenoid 10 or one deceleration motor 12. In this case, the solenoid 10 or the motor 4 is connected to the damper 2 and the upper lid 5 via a wire, a chain, or the like. The temperature sensor 8 detects the temperature in the room where the ventilation fan is installed. Therefore, the indoor side of the ventilation fan, or
It is placed indoors, away from ventilation fans. As shown in FIG. 4, the control means 9 includes a temperature sensor 8, a damper 2, and an opening/closing means for the upper lid 5.
Motor 4 is connected. The control means 9 is
A signal from the temperature sensor 8 controls the operation of the damper opening/closing means 6, the top lid opening/closing means 7, and the motor 4. The control means 9 opens and closes the damper 2 and the upper lid 5 in the states shown in Table 1, and controls the operation of the motor 4, for example. That is, the damper 2 and the top lid 5 are opened at a temperature of 26°C or higher, and the motor 4 is operated at a temperature of 30°C or higher. However, it goes without saying that this set temperature is adjusted to the optimum value taking into consideration the purpose of the ventilation fan.

[Brief explanation of the drawing]

Fig. 1 is a front view of a ventilation fan showing an embodiment of this invention, Figs. 2 and 3 are side views and horizontal sectional views showing the attachment part between the damper and the top cover, and Fig. 4 is a circuit diagram of the control means. be. 1...Frame, 1A...Vertical frame, 1B...Horizontal frame, 2...
...Damper, 3...Fan, 4...Motor, 5
...Top lid, 6...Damper opening/closing means, 7...Top lid opening/closing means, 8...Temperature sensor, 9...Control means, 10...Solenoid, 11...Connection rod,
12... Deceleration motor, 13... Rotating shaft, 14...
...Shaft, 15...Insulation material, 16...Pin, 17...
arm.

Claims (1)

[Scope of claim for utility model registration] A ventilation fan having the following configuration. (a) It includes a frame 1, a damper 2, a fan 3, a motor 4, an upper lid 5, a damper opening/closing means 6, an upper lid opening/closing means 7, a temperature sensor 8, and a control means 9. (b) The frame 1 is assembled into a rectangular shape with a vertical frame 1A and a horizontal frame 1B. (c) The damper 2 is composed of a plurality of blades. (d) The blades extend horizontally and are rotatably connected to the frame 1 at regular intervals. (e) The damper 2 is connected to the damper opening/closing means 6 and is forcibly opened/closed. (f) The fan 3 is connected to a motor 4 and is rotatably disposed within the frame 1. (g) The upper lid 5 is located at the end of the blade of the damper 2, and is arranged parallel to the vertical frame 1A. (h) The upper lid 5 is rotatably connected to the frame 1 about an axis parallel to the vertical frame 1A. (i) In the closing position, the upper lid 5 is arranged to close the vertical frame 1A and the end front surface of the damper blade. (j) The upper lid opening/closing means 7 is connected to the upper lid 5, and the upper lid 5 is opened/closed by the upper lid opening/closing means 7. (k) the temperature sensor 8 is connected to the control means 9;
The control means 9 controls the operation of the motor 4 and the opening/closing states of the damper opening/closing means 6 and the top lid opening/closing means 7.