JP3631817B2 - Forced supply / exhaust blower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a forced air supply / exhaust fan, more specifically, a range hood fan that eliminates negative pressure in a room (kitchen) in order to positively exhaust oily smoke generated in cooking under the current situation where houses are airtight. The present invention relates to a forced air supply / exhaust fan.
[0002]
[Prior art]
This type of forced air supply / exhaust blower is made of blades one by one, and the blades are implanted in the upper and lower plates to form an exhaust fan and an air supply fan. Both fans protrude forward and backward from the motor. Each of the rotating shafts is coaxially mounted, and its exhaust fan and air supply fan are housed in separate casings (Japanese Utility Model Publication No. 3-57336, Japanese Utility Model Publication No. 3-57337).
In this structure, the blades are cut out from the substrate one by one, so that unusable materials such as end cuts are generated, and the material cost is high. Since each blade is implanted into the upper and lower plates, it takes time and effort. Prepare two casings and two independent casings. The motor must also have a structure with a rotating shaft at the front and rear. For this reason, there was a problem that the production cost increased.
[0003]
[Problems to be solved by the invention]
Therefore, as shown in FIG. 8 , the applicant of the present application has disclosed a double-sided suction type multi-blade that is divided into two in the axial direction by a power transmission plate 32 provided vertically in an intermediate portion, as disclosed in Japanese Patent Application No. 7-188083. Proposing a blower for forced supply / exhaust in which a fan 2 is housed in a casing 1 and the inside of the casing 1 is partitioned into an exhaust chamber 200 and an air supply chamber 300 by a partition wall 71 provided on an extension line of the power transmission plate 32. Yes.
The earlier proposal makes it possible to supply and exhaust air with one fan and one casing.
However, a space Y that does not interfere with the rotation of the power transmission plate 32 between the partition wall 71 and the power transmission plate 32 and the partition wall 71 must be ensured in a ring shape. However, there is a possibility that the supply air is mixed into the air supply chamber 300 and the supply air into the exhaust chamber 200. In particular, it is not preferable to supply an air-fuel mixture in which exhaust gas is mixed into fresh outside air to the indoor living space.
In addition, even for a single fan, the blades are cut out from the substrate one by one. Implanting the blades one by one on the upper and lower plates was no different from the prior art, and it was not possible to reduce the production cost to the expected level.
[0004]
The present invention has been made in view of conventional circumstances, and an object of the present invention is to provide a forced supply / exhaust blower in which exhaust and supply air do not mix with each other at low cost.
[0005]
[Means for Solving the Problems]
The technical means taken in order to achieve the above-described object is that, in claim 1, a predetermined number of blades are cut and raised, and the upper plate is connected to the suction side peripheral end of the sirocco fan substrate wound in a cylindrical shape. A double-sided suction type multi-blade fan in which two fan portions formed by crimping and fixing a lower plate at the end are connected back to back with a fan partition plate formed slightly larger in diameter than the fan, A casing for accommodating the multiblade fan, the casing having a partition at a position corresponding to the fan partition plate and partitioned into an exhaust chamber and an air supply chamber, and an elastic film is formed on an outer edge of the fan partition plate. The gist of the present invention is that an overlap structure is formed with a small gap between the elastic membrane and the partition wall .
Further, according to a second aspect of the present invention, the fan partition plate is a disk-shaped elastic plate formed with a larger diameter than the fan portion, and the elastic plate forms an overlap structure with a small gap between the partition plate and the partition. Is the gist.
[0006]
According to the above technical means, an overlap structure is formed by the elastic membrane fitted and fixed to the peripheral end of the fan partition plate and the partition arranged with a small gap with respect to the elastic membrane, As a result of forming an overlap structure with the elastic plate sandwiched between the fan parts and the partition wall arranged with a small gap with respect to the elastic plate, the air pressure in the exhaust chamber where the elastic film or elastic plate faces is supplied When mixed in the room, it bends elastically so as to further reduce the small gap, thereby creating a large flow path resistance, and exerts a great effect in preventing particularly undesirable exhaust gas from being mixed into the air supply.
In the case where the small gap has a labyrinth, the flow path resistance is further increased, and mixing of the exhaust air into the air supply chamber and the air supply into the exhaust chamber is more reliably prevented.
Then, the blades are cut and raised from the sirocco fan substrate, and the upper and lower plates are collectively fixed (clamped) to the peripheral edge of the sirocco fan substrate wound in a cylindrical shape to form two fan portions, Since the two fan parts are connected back to back to form a multiblade fan, it can be manufactured at low cost.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show an embodiment of claim 1 (hereinafter referred to as a first embodiment), and FIG. 6 shows another embodiment of claim 1 (a second embodiment hereinafter). the referred to as), FIG. 7, in the implementation in the form of claim 2 (described later are each shown is referred to) in the third embodiment.
First, the first embodiment will be described. Reference numeral B denotes a range hood fan in which a forced air supply / exhaust fan A of the present invention is accommodated, A is a forced air supply / exhaust fan, and b is the forced air supply / exhaust. A hood main body for storing the blower A for the air, 3 is an exhaust duct connected to the blower A for forced supply / exhaust air, 4 is an air supply duct connected to the air supply chamber 5, and oil smoke, odor, etc. generated by cooking are The forced air supply / exhaust fan A is discharged to the outside through the exhaust duct 3 so that fresh outdoor air is supplied from the air supply duct 4 to the room through the air supply chamber 5 from the forced air supply / exhaust fan A. It has become.
[0008]
The forced air supply / exhaust fan A includes a casing 1 and a multi-blade fan 2 accommodated in the casing 1, and a motor 11 for driving the multi-blade fan 2 is fixed to the outside of the casing 1.
[0009]
The casing 1 has a well-known volute shape, and is covered with a front plate 21 having an attachment / detachment hole 21a for the multiblade fan 2 on the front side in the axial direction and a rear plate 31 having an opening 31a on the rear side. The bell mouth 21b is screwed into the attaching / detaching hole 21a to form an exhaust suction port 41, and the curved bell mouth 31b is bent inside the opening 31a of the rear plate 31 to make the suction port 51 A partition wall 71 is provided vertically in the middle part between the suction ports 41 and 51 before and after that.
[0010]
The multiblade fan 2 is formed in a double-sided suction structure in which two fan portions 12 and 22 are connected back-to-back with each other in the shape of a disk-like lower plate 12a and 22a.
[0011]
Specifically, each of the fan portions 12 and 22 is formed by press-molding the bulging portion 101 at a predetermined interval in the length direction while leaving a predetermined range of the longitudinal edge of the sirocco fan substrate 100 having a strip shape. A cut 102 is made in a substantially U-shape in a planar shape so as to surround the bulging portion 101, the cut portion is cut and raised, and the blade forming portion that has been cut and raised is crushed to flatten the bulging portion 101. The flat blades 12c and 22c are bent to a predetermined curvature, and the to-be-clamped plate portion 104 is raised from the band plate portion remaining on the longitudinal edge to form the sirocco fan substrate 100 in a cylindrical shape. An annular upper plate 12b, 22b is attached to the to-be-clamped plate portion 104 at the suction side peripheral end, and a disc-like lower plate 12a, 22a is respectively attached to the to-be-clamped plate portion 104 at the other peripheral end on the opposite side. It is formed by caulking and fixing (see FIGS. 3, 4, and 5).
[0012]
As shown in FIGS. 1 and 2, the two fan portions 12 and 22 are made of rubber or soft plastic at a peripheral end portion of a fan partition plate 7 sandwiched by fan bosses 6 connected between the fan portions 12 and 22 . A ring-shaped elastic film 8 such as the like is fitted and fixed.
Figure 2 is a case of two equal size or almost the same diameter fan unit 12, 22, FIG. 6 is the same diameter of the first as the second embodiment, the one or both of the lower plate 12 a, 22 a and an annular Or the case of two fan parts 12 and 22 having substantially the same diameter is shown.
[0013]
The partition wall 71 is bisected into a front and rear intermediate portion of the casing 1 which exhibits a volute shape, slightly opened large diameter opening 71a than the rear side in the multi-blade fan 2 and coaxial fan 22 The elastic membrane 8 divides the casing 1 into a front exhaust chamber 200 and a rear air supply chamber 300.
[0014]
The fan partition plate 7 has a slightly larger diameter than the fan portions 12 and 22, and forms an overlap structure with a small gap X between the elastic film 8 and the vicinity of the opening 71 a of the partition 71 .
[0015]
The air supply chamber 5 to which the air supply duct 4 is connected is attached over the back plate b1 and the top plate b2 of the hood body b.
An opening 15 a is provided in the front surface portion 15 of the air supply chamber 5, and the blower A is a half portion of the motor 11 supported through a cross-shaped mounting leg 11 b provided on the rear plate 31 of the casing 1. It is attached to the housing shape inside from the opening 15 a of the front portion 15.
[0016]
The multiblade fan 2 is assembled is a nut 11 c stop from the exhaust chamber 200 to the fan boss 6 center of the suction port 51 provided with the insertion and the motor shaft 11 a was in a plate 31 of the casing 1 Yes.
[0017]
When the forced air supply / exhaust fan A according to the first and second embodiments having such a configuration is operated, the front-side suction port draws exhaust gas, odors, etc. generated by cooking from the filter. 41 the air supply duct 4 in parallel with the sucking in exhaust chamber 200 of fresh outside air outdoors from through the opening 15 a of the air supply chamber 5 suction the air supply chamber 300 through an exhaust duct 3 an exhaust outdoors In addition, fresh fresh air is discharged into the room through a slit b2 'provided in the top plate b2.
At this time, since the elastic film 8 on the outer edge of the fan partition plate 7 and the partition 71 face each other with the small gap X increasing the flow resistance as described above, the gas flows through the small gap X. Guests crowded intermingled exhaust air supply chamber 300 of the exhaust chamber 200 in preventing action, reverse the fresh outside air supply chamber 300 to Dari crowded mix to the exhaust chamber 200 can be prevented.
Then, when the exhaust pressure of the exhaust chamber 200 facing the elastic film 8 is larger than the supply pressure of the supply chamber 300 , the small gap X can be further bent to increase the flow resistance, Greatly effective in preventing undesirable exhaust from being mixed into the supply air.
Further, after removing the front of the bell mouth 21 b, cleaning of the fan 2 by removing the multi-blade fan 2 from detachable hole 21 a by solving the nut 11 c, perform inspection.
[0018]
Next, a third embodiment will be described. In this embodiment, as shown in FIG. 7, the fan partition plate 7 having the elastic film 8 shown in the first and second embodiments is provided. rubber, made of an elastic plate 9 made of soft plastic or the like, the elastic plate 9, to form an overlapping structure across the small gap X in the opening 71 a vicinity of the peripheral end portion near the partition wall 71 As shown in FIG.
[0019]
In addition, it is also free to project protrusions on the constituent surfaces of the partition walls 71 that form the small gaps X described above or to apply flocking. In this case, the protrusions and the flocks are prevented from contacting each other so as not to cause the rotational resistance of the multiblade fan. If comprised in this way, channel resistance will be still larger and a favorable result will be obtained.
[0020]
Further, the two fan portions 12 and 22 constituting the multiblade fan 2 are obtained by rounding a sirocco fan substrate in which a predetermined number of blades are cut and raised without forming a bulging portion as described above, The upper plate and the lower plate are each formed by crimping and fixing to the to-be-clamped plate portion, or after the blades are cut and raised as described above, the narrow strip portion remaining on the longitudinal edge is reduced in diameter. The sirocco fan board wound in a cylindrical shape has a predetermined number of blades cut and raised, and the peripheral edge of the sirocco fan board is folded. Any structure may be used as long as it has a cross-sectional structure in which the upper plate and the lower plate are fixed by crimping.
【The invention's effect】
In the present invention, two fan portions are formed by caulking and fixing the upper plate to the peripheral end of the sirocco fan substrate formed by cutting and raising the blades as described above, and the lower plate to the other peripheral end. Because multi-blade fans connected back-to-back are used, the material may not be effectively used due to the occurrence of cuts and the like, as in the prior art, where blades are cut out from the substrate one by one. Production costs can be significantly reduced without the hassle of planting the upper and lower plates.
Moreover, an overlap structure is formed by the elastic film fitted and fixed to the peripheral edge of the fan partition plate and the partition arranged with a small gap with respect to the elastic film, or is sandwiched between two fan portions. Since the overlap structure is formed by the elastic plate and the partition wall that is arranged with a small gap with respect to the elastic plate, the small gap creates a large flow resistance, and does not allow the exhaust and supply air to flow. It can prevent the flow of exhaust into the air supply chamber and the supply air into the exhaust chamber, and the exhaust pressure in the exhaust chamber facing the elastic membrane or elastic plate is the supply pressure. If it is higher than the above, it bends elastically so as to make the small gap small, and it is effective in preventing the mixing of particularly undesirable exhaust into the supply air.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view of a range hood fan incorporating a forced air supply / exhaust fan according to a first embodiment.
FIG. 2 is an enlarged cross-sectional view of a main part of the first embodiment.
FIG. 3 is a plan view showing a state in which blades are molded from a belt-shaped sirocco fan substrate.
4 is a cross-sectional plan view of FIG. 3. FIG.
FIG. 5 is a perspective view showing a state in which an upper plate and a lower plate are caulked and fixed to a sirocco fan substrate rounded into a cylindrical shape.
FIG. 6 is an enlarged cross-sectional view of a main part of the second embodiment.
FIG. 7 is an enlarged cross-sectional view of a main part of the third embodiment.
FIG. 8 is an enlarged cross-sectional view showing a main part of a conventional forced air supply / exhaust fan.
[Explanation of symbols]
A: Blower for forced supply / exhaust 12, 22: Fan section X: Small gap 1: Casing
71: Bulkhead 200: Exhaust chamber
300: Air supply chamber 2: Multi-blade fan
12b, 22b: Upper plate 12a, 22a: Lower plate 7: Fan partition plate 12c, 22c: Blade 8: Elastic film 9: Elastic plate

Claims (2)

Wings a predetermined number of cut and raised, the fan two fans portion formed by the lower plate and caulking fixed to the suction-side peripheral edge of the substrate for the sirocco fan that is wrapped cylindrical upper plate, the other peripheral end A double-sided suction type multi-blade fan that sandwiches a fan partition plate that has a slightly larger diameter and is connected back to back, and a casing that accommodates the multi-blade fan, the casing including the fan partition plate A partition wall is provided at a position corresponding to the above and is divided into an exhaust chamber and an air supply chamber. An elastic film is fitted and fixed to the outer edge of the fan partition plate, and the elastic film and the partition wall are separated by a small gap. A blower for forced supply / exhaust characterized by comprising a wrap structure. Claim wherein the fan partition plate is disc-shaped elastic plate that is formed to be larger in diameter than the fan unit, characterized in that it constitutes the overlapping structure elastic plate spaced small gap between the partition wall The blower for forced supply / exhaust according to 1 .

Images