JP2012154537A - Backflow prevention damper, and range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the optimization of an exhaust gas flow by providing a backflow prevention damper having: an attaching portion used for attaching the backflow prevention damper to an exhaust portion; an opening/blocking portion which opens and blocks exhaust to an exhaust duct; and a position adjusting portion which is configured so that a position of the opening/blocking portion can be adjusted with respect to the attaching portion.SOLUTION: The backflow prevention damper includes: the opening/blocking portion which opens and blocks exhaust to the exhaust duct; and the position adjusting portion which is configured so that the position of the opening/blocking portion can be adjusted with respect to the attaching portion.

Description

  The present invention relates to a backflow prevention damper and a range hood.

The conventional backflow prevention damper is provided in a portion corresponding to the exhaust port of the range hood.
The backflow prevention damper attached to this exhaust port prevents air from flowing back into the room from the exhaust duct when the range hood is not in operation, preventing insects from entering the exhaust duct and backflow of outside air. It is a very useful structure because it can be expected, and it is used in most existing range hoods.

Here, as shown in the embodiment of Patent Document 1, when the backflow prevention damper is attached to the range hood, the opening direction of the damper corresponding to the flap of the backflow prevention damper is connected to the downstream side of the backflow prevention damper. It was installed in the same direction as the duct direction after the first bend of the duct.
By doing this, the flap of the backflow prevention damper became a resistance to the exhaust in the room, and it was possible to prevent problems such as a drop in the air volume and abnormal noise.

However, the following problem was found here on how to install the backflow prevention damper.
The conventional method of attaching a damper for backflow prevention attached to a range hood shown in Patent Document 1 has a structure in which an exhaust port is screwed and hooked into a square hood opening provided in a range hood body or an L-shaped duct. For this reason, the opening direction of the flap 6 is limited to four directions. Specifically, the range hood exhaust port and backflow prevention damper are installed in a square opening, because the exhaust port and backflow prevention damper connection are both square, so the sides of the range hood match each other. Therefore, the opening direction of the flap 6 is limited to four mounting angles of 0 °, 90 °, 180 °, and 270 °. Accordingly, the opening direction of the flap of the damper for preventing backflow has been limited to four directions depending on the mounting direction.

Therefore, when connecting the range hood and the exhaust duct, the flap opening direction of the backflow prevention damper and the pipe direction after the first bend of the exhaust duct arranged downstream of the backflow prevention damper are implemented in the flap opening direction. If it does not match any of the above four possible directions, the flap opening direction of the backflow prevention damper cannot be adjusted to the optimum direction, and the first exhaust duct downstream from the backflow prevention damper In some cases, the flaps provided in the backflow prevention damper to be opened in the direction of the pipeline after the bending are countered or shifted in the direction of the pipeline after the first bending of the exhaust duct.
As a malfunction at that time, it becomes the resistance of the exhaust in the room, the air volume falls, the usability as a range hood such as abnormal noise comes out, and the function as a range hood cannot be fully demonstrated I understood for the first time.

JP 10-205846 A

  By installing the flap of the backflow prevention damper, the opening direction of the flap provided in the backflow prevention damper to be opened toward the pipe direction after the first bend of the exhaust duct located downstream of the backflow prevention damper is Not only the duct direction after the first bend of the duct can be handled, but it becomes resistance of the exhaust in the room, the air volume drops, and the usability as a range hood such as abnormal noise is deteriorated, There was a problem that the function as a range hood could not be demonstrated.

In order to achieve the above object, according to the present invention, an air intake section for sucking indoor air;
An exhaust section serving as an exhaust passage to the exhaust duct;
A backflow prevention damper attached to a range hood comprising:
An attachment part to the exhaust part;
An opening and closing part for opening and closing the exhaust to the exhaust duct,
Provided is a backflow prevention damper, wherein the opening / closing part includes a position adjustment part configured to be position-adjustable with respect to the attachment part.
Therefore, the position of the opening / closing part can be adjusted in the direction of the pipe line after the first bending of the exhaust duct on the downstream side, and it is not necessary to disturb the exhaust state.
In order to achieve the above object, according to the present invention, there is provided a backflow prevention damper characterized in that the position adjusting part can freely adjust the position of the opening / closing part in the circumferential direction with respect to the attachment part.
Therefore, in any state, the position of the opening / closing portion can be adjusted in the direction of the pipe line after the first turn of the downstream exhaust duct, and the exhaust state is not hindered.
In order to achieve the above object, according to the present invention, there is provided a display unit indicating an opening / closing direction of the opening / closing unit.
Therefore, the position of the opening / closing part in the circumferential direction can be adjusted from the outside even after connection to the exhaust duct, which is convenient in construction.
In order to achieve the above object, according to the present invention, there is provided a range hood characterized in that these backflow prevention dampers are provided in the exhaust portion of the range hood.
Therefore, it is possible to provide a range hood that can adjust the position of the opening / closing portion in the pipe direction after the first bend of the downstream exhaust duct in any state and does not hinder the exhaust state. it can.

  The present invention has been made to solve the above problems, and the effect of the present invention is that the direction of the flap of the backflow prevention damper is independent of the direction of the first bent duct of the exhaust duct downstream of the backflow prevention damper. It is to provide a backflow prevention damper and a range hood that can be properly installed.

It is a figure which shows the connection state of a range hood and the damper for backflow prevention. It is a figure which shows the state which the flap part of this invention closed. It is a figure which shows the damper for backflow prevention of the range hood of this invention. It is sectional drawing which shows the example of attachment of the attachment base and flap attachment part of this invention. It is a figure which shows the example in case the direction of the exhaust duct of FIG. 1 of this invention differs. It is sectional drawing which shows the 2nd Example of the backflow prevention damper of the range hood of this invention. It is sectional drawing which shows the 3rd Example of the backflow prevention damper of the range hood of this invention.

A first embodiment of the range hood of the present invention will be described with reference to FIGS.
FIG. 1 shows a state in which the backflow preventing damper 5 is attached to the range hood 1.
FIG. 2 shows a state in which the flap 6 which is an opening / closing part provided in the backflow prevention damper is closed.
The range hood 1 mentioned here is composed of a hood body 2 and a casing 3, and in this embodiment, the casing 2 is provided with an L-shaped duct 3.
The casing 3 has a box shape incorporating an exhaust fan (not shown).
When the range hood 1 is not exhausted, the flap 6 provided in the backflow prevention damper is in a closed state. At that time, effects such as prevention of insects from the exhaust duct 11 and backflow of outside wind can be expected.

The pipeline structure of the range hood will be described with reference to FIG.
Although the bottom surface of the range hood 1 is not shown, it is provided with an air intake A, and indoor air containing hot air, oily smoke and the like generated during cooking is taken into the casing 3 by an exhaust fan (not shown) in the casing 3. It is said that it is discharged from the backflow prevention damper 5 through the exhaust duct 11 in the B direction, and mainly plays a role of ventilation.

The backflow preventing damper 5 will be described with reference to FIGS. 3 and 4.
FIG. 4 is a cross-sectional view, and since this figure is symmetrical, only half of the cross-section is shown.
FIG. 3 shows a first embodiment of the backflow prevention damper 5, which is composed of an attachment base 8, a seal material 10, a flap attachment portion 9, and a flap 6 as attachment portions. As shown in FIG. 4, an elastic material 10 is attached over the entire circumference. The flap attachment portion 9 is inserted from above the elastic member 10, and the fitting portion 14 as the position adjustment portion rotates 360 °, so that the opening direction of the flap 6 can be freely aligned in the circumferential direction. Is possible.
The problem that the opening direction of the conventional flap 6 is limited to the mounting angles of 0 °, 90 °, 180 °, and 270 ° is solved, and the backflow prevention is performed in the predetermined duct direction of the exhaust duct 11. By rotating the fitting portion 14, the flap 6 provided in the backflow prevention damper 5 to be opened toward the duct direction after the first bend of the exhaust duct 11 disposed downstream of the damper 5 is obtained. An ideal opening direction of the flap 6 that can be opened toward the pipe direction after the first bend can be realized.
That is, when the range hood 1 exhausts air from the room toward the exhaust duct 11, the backflow prevention damper 5 to be opened toward the pipe direction after the first bending of the exhaust duct 11 downstream of the backflow prevention damper 5. If the provided flap 6 cannot be opened in the direction of the pipe line after the first bend of the exhaust duct 11, the flap 6 becomes an exhaust resistance, and the air flow is reduced. Troubles such as sound can be solved.

The attachment structure of the flap 6 will be described with reference to FIGS. 3 and 4. A shaft portion (not shown) provided at the opening corresponding to the exhaust portion of the cylindrical flap attachment portion 9 to which the exhaust duct 11 is connected is provided. Yes. The shaft is inserted into a bearing provided on the flap 6. Based on this axis, the lid-like flap 6 opens and closes with respect to the exhaust duct 11.
The opening direction of the flap referred to here is expressed as the opening direction of the opening having the larger area with respect to the axis of the flap 6 that is a lid-like circle fixed to the shaft.
This is because the flap 6 is opened based on the axis, so that the direction on the side where the flap opening area is large with respect to the axis and perpendicular to the axis is regarded as the optimum exhaust direction.

The elastic material 10 is attached to the mounting base 8 portion in order to eliminate a gap between the mounting base 8 and the flap mounting portion 9. The elastic material 10 is not completely fixed together with the role of the sealing material between the mounting base 8 and the flap mounting portion 9. Is held at an appropriate pressure in such a manner that the fitting portion 14 is sandwiched, so that the fitting portion 14 can be manually rotated in a state where there is no exhaust leakage.
The elastic material 10 here refers to a sealing material such as an eptosealer or norprene made of EPDM rubber or the like, and has a function of supporting the attachment base 8 and the flap attachment portion 9 while preventing exhaust leakage.

As a result, the flap attachment portion 9 is manually rotated even after the attachment base 8 and the casing 3 are fixed, and the angle of the backflow prevention damper is limited to the attachment angles of 0 °, 90 °, 180 °, and 270 °. It can be adjusted to any mounting direction steplessly.
Since the flap attaching part 9 is provided with the opening side mark 16 as a display part, the opening direction of the flap 6 can be confirmed even in a state where the flap 6 cannot be seen. By aligning the opening side mark 16 toward the duct direction after the first bend of the exhaust duct 11, an ideal opening direction of the flap 6 can be realized. It can also prevent installation mistakes such as mounting it as it is.
Similarly, even when the position and orientation of the exhaust duct 11 cannot be changed during renovation, the fitting portion 14 is rotated in accordance with the position and orientation of the exhaust duct 11 and the exhaust downstream of the backflow prevention damper 5. An ideal opening direction of the flap 6 in which the flap 6 provided in the backflow prevention damper 5 can open toward the pipe direction can be realized in accordance with the pipe direction after the first bending of the duct 11. This will be described with reference to FIG.

FIG. 5 shows an on-site example different from the first example, and is an example assuming a case where the pipe direction after the first bend on the downstream side of the backflow prevention damper of the exhaust duct 11 is different.
The duct direction of the exhaust duct 11 illustrated in FIG. 5 is directed to G which is the exhaust direction.
In the range hood of the present invention, the opening direction of the flap 6 can be adjusted steplessly to any pipe line direction, so the pipe line in the case of the direction of the exhaust duct 11 as shown in FIG. By directing the opening direction of the flap toward the direction G, an ideal opening direction of the flap 6 can be realized.

In other words, the opening direction of the flap 6 provided in the backflow prevention damper 5 that has been limited so far rotates the fitting portion 14 so that the flap is moved toward the pipe line after the first bending located downstream. Even if the direction of the exhaust duct varies from site to site in the pipeline direction B direction or the G direction, which is an embodiment, it can be adjusted to the opening direction of the flap 6 suitable for each.

FIG. 6 shows a second embodiment of the backflow preventing damper.
FIG. 6 is a cross-sectional view, and since this figure is symmetrical, only half of the cross-section is shown.
A groove portion 12 that fits into the flap attachment portion 9 is provided in the attachment base 8, and a claw portion 13 is provided at the tip of the flap attachment portion 9. By fitting the claw part 13 into the groove part 12, the opening direction of the flap 6 can be aligned freely.
Further, although not shown, the groove portions are arranged at intervals of 20 degrees, so that the alignment can be performed at every arrangement angle of the groove portions.

FIG. 7 shows a third embodiment of the backflow preventing damper.
Since FIG. 7 is a cross-sectional view and is symmetrical in this drawing, only half of the cross-section is shown.
The case where the elastic material 10 of 1st Example exists in the outer side of the attachment base 8 is represented.
Also in the present embodiment, as in the first embodiment, the position of the fitting portion can be adjusted steplessly in the collecting direction, and an optimal exhaust state can be realized.

DESCRIPTION OF SYMBOLS 1 ... Range hood 2 ... Hood main body 3 ... Casing 4 ... L-shaped duct 5 ... Backflow prevention damper 6 ... Flap 7 ... Screw fixing position 8 ... Mounting base 9 ... Flap attaching part 10 ... Elastic material 11 ... Exhaust duct 12 ... Groove part 13 ... Claw part 14 ... Fitting part 15 ... Range hood exhaust part 16 ... Opening side mark

Claims (4)

An air intake that draws in indoor air;
An exhaust section serving as an exhaust passage to the exhaust duct;
A backflow prevention damper attached to a range hood comprising:
An attachment part to the exhaust part;
An opening and closing part for opening and closing the exhaust to the exhaust duct,
A backflow prevention damper, comprising: a position adjusting portion configured to adjust the position of the opening / closing portion with respect to the attachment portion. The position adjusting portion can adjust the position of the opening / closing portion freely in the circumferential direction with respect to the mounting portion. 2. The backflow prevention damper according to claim 1, wherein a display portion indicating an opening / closing direction of the opening / closing portion is provided outside the position adjusting portion. A range hood comprising the backflow prevention damper according to any one of claims 1 to 3 in an exhaust portion of the range hood.

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