JP6894627B2 - Fan unit and respiratory protective equipment with this fan unit - Google Patents

Description

The present invention relates to a fan unit having a high static pressure and excellent air volume characteristics, and a respiratory protective device such as a dust mask or a gas mask provided with the fan unit.

Conventionally, as a fan unit of this type, there is a unit including an impeller that rotates about a rotation axis, a motor that rotationally drives the impeller, and a case that houses the impeller and the motor (Patent Document 1). ).

The case has an upper case, a lower case having a motor accommodating portion covering the outer circumference of the motor, and a fastening portion for fixing the upper case and the lower case.

Further, a first annular space located radially outward of the motor is formed in the case, and the first annular space has the inner peripheral edge of the fastening portion and the diameter of the motor accommodating portion. It is composed of a space formed by making the shortest distance from the outermost peripheral portion in the direction a diameter and connecting virtual circles in contact with the inner peripheral edge of the fastening portion in an annular shape, the upper case, and the lower case. It has a second annular space, and a part of the impeller is arranged in the second annular space.

Japanese Unexamined Patent Publication No. 2013-185440

The fan unit described in Patent Document 1 is provided with a second blade in an annular space, which is a ventilation path, to increase ventilation resistance, suppress air from flowing back to the intake port side, and generate static pressure. It is said that it will provide a small fan with high air volume characteristics.

However, in the fan unit described in Patent Document 1, in order to further increase the static pressure, it is necessary to increase the blade area, and further miniaturization is difficult. In particular, in devices worn by humans such as respiratory protective equipment, miniaturization of the fan unit is strongly desired from the viewpoint of improving workability and comfort.

That is, in the fan unit described in Patent Document 1, since only the upper part of the motor is the installation space for the blades, the space occupied by the motor portion is large with respect to the whole, and if an attempt is made to improve the characteristics by increasing the size of the blades, the characteristics are further improved. There was a problem that it became difficult to realize miniaturization.

Therefore, an object of the present invention is to provide a fan unit having a higher static pressure and an air volume while realizing further miniaturization, and to provide a respiratory protective device equipped with such a fan unit. It is the purpose.

The fan unit of the present invention includes an impeller 11, a motor 12 for rotationally driving the impeller 11, and a motor base 14 for mounting the motor 12 on a substrate 13, and the impeller 11 has an annular hub portion 15. As a plurality of first blades 11a as centrifugal fans provided perpendicular to the above, and as an axial flow fan provided radially from a support portion 16 provided at the center of the hub portion 15 toward the peripheral edge of the hub portion 15. It is composed of a plurality of second blades 11b and is configured to surround the periphery and the front surface of the motor 12, and the motor base 14 surrounds the periphery of the motor 12 and extends from the front portion to the rear portion of the motor 12. A substantially truncated cone-shaped wind tunnel wall 14a that is inclined outward is provided, and air is sucked by the second blade 11b along the wind tunnel wall 14a, and further, the first blade (11a). The inside of the wind tunnel wall (14a) is hollowed out along the slope of the wind tunnel wall (14a).

The respiratory protective device of the present invention is provided with the fan unit.

Since the fan unit of the present invention is configured as described above, it is possible to realize miniaturization and further increase the static pressure and the air volume.

Further, since the respiratory protective device of the present invention is provided with a fan unit that is small in size and has a higher static pressure and air volume, the protective device itself can be made smaller and lighter in size and higher in performance without being bulky. It became a thing.

It is a side view of the respiratory protective equipment provided with the fan unit of this invention. It is a front view of the respiratory protective equipment shown in FIG. It is a top view of the respiratory protective equipment shown in FIG. It is a central vertical sectional view of the respiratory protective equipment shown in FIG. It is a front view of the fan unit of this invention. It is a central vertical sectional view of the fan unit of this invention shown in FIG. It is a perspective view of the fan used for the fan unit of this invention. It is a front view of the fan shown in FIG. 7. It is a side view of the fan shown in FIG. 7. FIG. 5 is a central longitudinal sectional view of a respiratory protective device according to another embodiment of the fan unit of the present invention. It is a front view of another embodiment of the fan unit of this invention. FIG. 11 is a central vertical sectional view of the fan unit of the present invention shown in FIG. FIG. 11 is a perspective view of another embodiment of the fan used in the fan unit of the present invention shown in FIG. It is a front view of the fan shown in FIG. It is a side view of the fan shown in FIG. It is a graph which shows the static pressure performance of the fan shown in FIG. 7, (a) shows the number of the first blade and the measurement result of the static pressure performance, (b) is the number of the second blade and the static pressure performance. The measurement result is shown.

Hereinafter, the fan unit of the present invention and a mode for carrying out the respiratory protective device provided with the fan unit will be described in detail with reference to the drawings.

The fan unit of the present invention is provided in the respiratory protective equipment by being incorporated in the respiratory protective equipment as shown in FIGS. 1 to 4.

The respiratory protective device includes a face body 1 that covers at least the nose and mouth of the wearer, a wearing band (not shown) that is hung from the wearer's head to the nape of the neck, and a filter device 3 that includes a fan unit 2. The fan unit 2 and the filter device 3 are provided on the vertical center line of the face piece 1, respectively.

The face piece 1 is made of synthetic resin or the like and has a hollow body having an oblique elliptical cone shape or an oblique polygonal pyramid shape. An intake valve 4 is provided in the central portion and an exhaust valve 5 is provided in the central upper portion. Further, it is assumed that the cover 6 is attached above the exhaust valve 5 of the face piece 1 via the ventilation space S. Further, it is assumed that the cushion material 7 is attached to the peripheral edge of the face piece 1. The valve structures of the intake valve 4 and the exhaust valve 5 are not particularly limited. The face body 1 shown in the figure is a half-faced face that covers the wearer's nose and mouth, but may be a full-face face that covers the entire face of the wearer.

As shown in FIGS. 4 to 6, the fan unit 2 includes an impeller 11 that rotates about a motor rotation shaft, a motor 12 that rotationally drives the impeller 11, and a motor base that mounts the motor 12 on a substrate 13. It has 14. As shown in FIGS. 7 to 9, the impeller 11 is provided at a plurality of first blades 11a as centrifugal fans provided perpendicular to the annular hub portion 15 and at the center of the hub portion 15. It is composed of a plurality of second blades 11b as axial fans provided radially from the support portion 16 toward the peripheral edge of the hub portion 15, and is configured to surround at least the front portion and the front surface of the motor 12. There is. With this configuration, the first blade 11a fully uses the effective space of the substrate 13 to exert the function as an original centrifugal fan, and the second blade 11b positively from the intake port. It also has a function as an axial fan that sucks in air. The hub portion 15 is composed of a front hub portion 15a and a rear hub portion 15b, and a ventilation space 15s is provided between the front hub portion 15a and the rear hub portion 15b. The second blade 11b passes through the ventilation space 15s. A part of the air sucked in by the first blade 11a is sent to the intake valve 4 side together with the air sucked by the first blade 11a. A straightening vane 17 is provided between the impeller 11 and the filter device 3, and the straightening vane 17 is provided in front of the opening 18 of the substrate 13 so as to face the impeller 11. Has been done. The straightening vane 17 regulates the flow of air sucked from the intake port, and is provided as needed.

Further, as shown in FIGS. 10 to 12, the fan unit 2 includes an impeller 11 that rotates about a motor rotation shaft, a motor 12 that rotationally drives the impeller 11, and a motor that mounts the motor 12 on a substrate 13. It has a base 14. As shown in FIGS. 13 to 15, the impeller 11 is provided at a plurality of first blades 11a as centrifugal fans provided perpendicular to the annular hub portion 15 and at the center of the hub portion 15. It is composed of a plurality of second blades 11b as axial fans provided radially from the support portion 16 toward the peripheral edge of the hub portion 15, and is configured to surround at least the front portion and the front surface of the motor 12. There is. With this configuration, the first blade 11a fully uses the effective space of the substrate 13 to exert the function as an original centrifugal fan, and the second blade 11b positively from the intake port. It also has a function as an axial fan that sucks in air. The motor base 14 has a portion that holds the motor 12 extended toward the motor output shaft side, surrounds the periphery of the motor 12, and is a substantially conical shape that is inclined outward from the front portion to the rear portion of the motor 12. A trapezoidal wind tunnel wall 14a is provided, and the air sucked by the second blade 11b along the wind tunnel wall 14a is smoothly sent to the intake valve 4 side to further increase the static pressure and the air volume. I am trying to do it. When the wind tunnel wall 14a is provided on the motor base 14, the inside of the first blade 11a is hollowed out along the inclination of the wind tunnel wall 14a, and the impeller is provided by the wind tunnel wall 14a. 11 is prevented from becoming larger than this. Further, the hub portion 15 is composed of a front hub portion 15a and a rear hub portion 15b, similar to those shown in FIGS. 7 to 9, and a ventilation space 15s is provided between the front hub portion 15a and the rear hub portion 15b. A part of the air sucked by the second blade 11b through the ventilation space 15s is sent to the intake valve 4 side together with the air sucked by the first blade 11a. Further, a straightening vane 17 is provided between the impeller 11 and the filter device 3, and the straightening vane 17 is provided in front of the opening 18 of the substrate 13 so as to face the impeller 11. Has been done. The straightening vane 17 regulates the flow of air sucked from the intake port, and is provided as needed.

The impeller 11 is composed of molded parts made of a polymer material. That is, since the impeller 11 rotates at high speed, balanced shape accuracy is required, and in addition to being lightweight, strength and rigidity are also required. Therefore, injection molding using a polymer material such as engineering plastic as a material is required. It is preferably made of parts.

The optimum number of the first blades 11a is 12 from the measurement result of the static pressure performance shown in FIG. 16 (a), and the number of the second blades 11b is the static pressure performance shown in FIG. 16 (b). From the measurement results, it was found that 6 sheets were the most suitable. Further, when the number of the first blades 11a is 6 or less, the strength and rigidity are low, when the number of the first blades is 15 or more, the weight becomes heavy and the static pressure decreases, and when the number of the second blades 11b exceeds 6, there is a gap between the blades. It is not preferable because it becomes narrow and the static pressure decreases.

The horizontal cross-sectional shape of the first blade 11a draws a mountainous curve from the center of rotation toward the rotation direction, and draws a curve via the inflection point P at a position of 1/2 or more from the outermost peripheral end. Is formed in. By drawing a curve having a shape in which the air resistance is increased through the inflection point P from the middle in this way, the force for pushing out the air, that is, the static pressure can be improved.

The base 13 incorporates a battery unit B for supplying electric power to the motor 12 and an electronic board 19 for controlling the motor 12. The battery unit B may be externally mounted, and power may be supplied to the motor 12 via the cable 20. Further, the electronic substrate 19 that controls the motor 12 is directly connected to a motor terminal provided on the back surface of the motor 12 on the opposite side of the impeller 11 mounting portion. By doing so, there is no troublesome connection wiring such as a plurality of electric conductors, and the structure is extremely space-saving, compact and lightweight.

_{The opening diameter R 1} of the opening 18 of the substrate 13 is formed to be larger than the outer peripheral circular diameter R ₂ of the second blade 11b, and is the same as or slightly larger than the inner peripheral circular diameter R _{3 of the first blade 11a (for example, R). 1} −R ₃ ≈ 0.4 mm) is formed. This is because _{if the difference between the opening diameter R 1} and the inner peripheral circular diameter R ₃ of the first blade 11a is too small, it becomes difficult for air to be sucked in, and if it is too large, airflow loss such as backflow occurs, which is smooth. It was confirmed that the relationship _{of R 1 −} R ₃ ≈ 0.4 mm is effective for the air supply.

The filter device 3 is composed of a cartridge type filter 21 for dust and poison prevention, a filter packing 22 for hermetically holding the filter 21 in a holding portion 8 provided in front of the face piece 1, and a holding cover 23. Become. The holding cover 23 is provided with a ventilation hole 24 in the central portion, and a spatter prevention filter 25 is fitted into the ventilation hole 24 as needed to press the filter 21 held in the holding portion 8 against the filter packing 22. As described above, it is attached to the outer wall of the holding portion 8 as a screw type so as to be detachable.

Since the fan unit of the present invention is configured as described above, it is possible to realize miniaturization as described above, and to further increase the static pressure and the air volume.

Further, since the respiratory protective device of the present invention is provided with a fan unit that is small in size and has a higher static pressure and air volume, the protective device itself can be reduced in size and weight without being bulky as described above. Moreover, it has become possible to improve the performance.

11 Impeller 11a 1st blade 11b 2nd blade 12 Motor 13 Base 14 Motor base 14a Wind tunnel wall 15 Hub part 16 Support part 18 Opening 19 Electronic board B Battery unit P Inflection point R ₁ Opening diameter R ₂ Outer circumference circular diameter R ₃ Inner circumference

Claims (2)

An impeller (11), a motor (12) for rotationally driving the impeller (11), and a motor base (14) for mounting the motor (12) on a substrate (13) are provided, and the impeller (11) is provided. , A plurality of first blades (11a) as centrifugal fans provided perpendicular to the annular hub portion (15), and a support portion (16) provided at the center of the hub portion (15) to the hub portion ( It is composed of a plurality of second blades (11b) as axial flow fans provided radially toward the peripheral edge of 15), and is configured to surround the periphery and the front surface of the motor (12).
The motor base (14) surrounds the circumference of the motor (12) and is provided with a substantially truncated cone-shaped wind tunnel wall (14a) inclined outward from the front portion to the rear portion of the motor (12). The air is sucked by the second blade (11b) along the wind tunnel wall (14a).
Further, the motor fan unit is characterized in that the inside of the first blade (11a) is hollowed out along the inclination of the wind tunnel wall (14a). A respiratory protective device comprising the motor fan unit according to claim 1.

Images