JP6479219B2 - Ventilation fan - Google Patents

Description

  The present invention relates to a ventilation fan in which a fan and a fan casing are provided inside a box.

  A ventilation fan is used in which a fan and a fan casing are provided inside a box that is open on one side. Such a ventilation fan is also provided with an electric motor as power for rotating the fan. Further, such a ventilation fan is provided with a wire connecting portion for connecting a wire for supplying electric power to the electric motor. The electric wire connecting portion is provided on a surface of the fan casing facing the opening side of the box in consideration of workability and maintainability of electric wire connecting work. Moreover, as disclosed in Patent Document 1, a cover that covers the electric wire connection portion is provided on the ventilation fan, so that moisture and dust can be prevented from entering the electric wire connection portion.

International Publication No. 2009/144778

  The cover that covers the wire connection part must be able to be easily opened and closed when performing wire connection and maintenance work, and the cover is securely closed to prevent moisture and dust from entering when using other products. It is required to be maintained.

  This invention is made in view of the above, Comprising: It aims at obtaining the ventilation fan which can aim at coexistence with the ease of opening and closing of the cover which covers an electric wire connection part, and the reliable maintenance of a closed state. .

  In order to solve the above-described problems and achieve the object, the present invention provides a box having a box shape with one side opened, a fan accommodated in the box, an electric motor for rotating the fan, The fan casing which accommodates a fan inside a box, the electric wire connection part provided in the surface which faces the opening side of a box in a fan casing, and the cover which covers an electric wire connection part are provided. The cover is rotatable about a rotation axis parallel to the opening and supported by the fan casing. The fan casing is formed with an enclosing rib surrounding the electric wire connecting portion. The surrounding rib is formed with an engaging portion that engages with an end portion of the cover that is opposite to the rotation shaft and restricts the cover from rotating in the opening direction. On both sides of the surrounding rib with the engaging portion interposed, there are slits extending from the front end of the surrounding rib toward the root side.

  The ventilation fan according to the present invention has an effect that it is possible to achieve both the ease of opening and closing of the cover covering the electric wire connecting portion and the reliable maintenance of the closed state.

Sectional drawing which shows the attachment state of the ventilation fan concerning Embodiment 1 of this invention The bottom view of the ventilation fan concerning Embodiment 1 It is the elements on larger scale which expanded the A section shown in FIG. 2, Comprising: The figure which shows the state which the cover opened It is the elements on larger scale which expanded the A section shown in FIG. 2, Comprising: The figure which shows the state which the cover closed The partial expansion perspective view which expanded the B section shown in FIG. Sectional drawing of the engaging part of the cover and surrounding rib in Embodiment 1

  Hereinafter, a ventilation fan according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing an attached state of the ventilation fan according to the first embodiment of the present invention. FIG. 2 is a bottom view of the ventilation fan according to the first embodiment. FIG. 3 is a partially enlarged perspective view in which the portion A shown in FIG. 2 is enlarged, and shows a state in which the cover is opened. FIG. 4 is a partially enlarged perspective view in which the portion A shown in FIG. 2 is enlarged, and shows a state in which the cover is closed. FIG. 5 is a partially enlarged perspective view in which the portion B shown in FIG. 3 is enlarged. FIG. 6 is a cross-sectional view of the engaging portion between the cover and the surrounding rib in the first embodiment.

  A ventilating fan 100 according to the first embodiment is provided in an opening formed in a ceiling, and a duct ventilating fan that ventilates indoor air by inserting a duct connection port 12 from the indoor side into a duct 13 communicated to the outside of the room. It is.

  The ventilation fan 100 includes a box body 21 having a box shape with one surface opened. The ventilation fan 100 is installed in the ceiling in a posture in which the opening of the box 21 is directed to the opening formed in the ceiling. A multi-blade fan 17 is accommodated in the box 21. A fan casing 22 that houses the fan 17 is provided inside the box body 21. The fan casing 22 is formed with a bell mouth portion 22d that opens toward the opening side of the box body 21 and an air outlet 22e that opens toward the duct connection port 12 side. A duct connection frame 23 that allows the air outlet 22e to communicate with the duct connection port 12 is provided on a side portion of the box body 21.

  The ventilation fan 100 includes an electric motor 16 that rotates the fan 17. By connecting the fan 17 to the drive shaft of the electric motor 16, the fan 17 can be rotated. When the fan 17 is rotated by the electric motor 16, an air flow from the bell mouth portion 22d toward the air outlet 22e is generated inside the fan casing 22. Thereby, the ventilation fan 100 can suck indoor air from the opening of the box body 21 and exhaust the sucked air to the outside through the duct connection port 12 and the duct 13.

  The ventilation fan 100 includes a decorative grill 31 that is a design component in order to make it difficult to see internal components such as the fan casing 22 from an opening formed in the ceiling. The decorative grill 31 includes a spring 32 for attaching the main body. The decorative grill 31 is fixed to the box 21 by hooking the spring 32 to the spring fixing portion 26 formed in the fan casing 22.

  The outer shape of the duct connection frame 23 is formed in steps having different diameters. This is because the ducts with different diameters can be connected and the workability of taping work in which tape is wound around the boundary between the duct connection frame 23 and the duct 13 is taken into consideration.

  A shutter 24 that opens and closes by wind pressure is provided in the duct connection frame 23. The shutter 24 is opened by the wind pressure when the ventilation fan 100 is operated, that is, when the electric motor 16 is operated, and the duct connection frame 23 is closed by the weight of the shutter 24 when stopped. By providing the shutter 24, it is possible to prevent outside wind from entering the room when the ventilation fan 100 is stopped. The duct 13 connected to the duct connection frame 23 extends to the outside and is connected to a hood provided on the outer wall of the building to form a ventilation air passage for ventilating the air in the house.

  An electric wire connecting portion 20 is provided on the surface of the fan casing 22 facing the opening formed in the box body 21. As shown in FIG. 3, a terminal block 27 is provided in the wire connection portion 20. The terminal block 27 and the electric motor 16 are electrically connected by an unillustrated internal wire. The terminal block 27 is formed with an insertion hole 27a into which an external power supply wire (not shown) can be inserted. The external power supplied from the top surface of the box 21 to the inside of the box 21 is inserted into the insertion hole 27a, so that the external power supplied from the external power supply is converted to the terminal block 27 and the internal cable. To be supplied to the electric motor 16. The electric motor 16 converts the supplied electric energy into a rotational motion of the drive shaft, and transmits the rotational motion to the fan 17.

  The electric wire connection portion 20 is covered with a cover 19 that is provided so as to be rotatable about a rotation shaft 28 parallel to the opening of the box body 21 with respect to the fan casing 22. By covering the wire connecting part 20 with the cover 19, it is possible to suppress moisture and dust from entering the wire connecting part 20. In addition, by opening the cover 19, an external power supply wire inserted from a rubber bush (not shown) on the top surface side of the box body 21 can be inserted into the insertion hole 27 a of the terminal block 27. Thereby, the connection operation | work of the external power supply wire in the state which installed the ventilation fan 100 in the ceiling becomes easy.

  A surrounding rib 29 is provided on the fan casing 22 so as to surround the electric wire connection portion 20. As shown in FIGS. 3 and 5, the surrounding rib 29 is formed with an engaging portion 22 a that protrudes toward a region surrounded by the surrounding rib 29. The engaging portion 22a is engaged with an end portion of the cover 19 that is opposite to the rotation shaft 28, thereby restricting the cover 19 from rotating in the opening direction and maintaining the closed state. It is. From the viewpoint of safety, the cover 19 has a structure that cannot be opened by its own weight so that it cannot be easily contacted with the wire connection portion 20.

  However, since it is necessary to open the cover 19 during the wiring work, slits 22c extending from the front end of the surrounding rib 29 toward the root side are formed on both sides of the surrounding rib 29 with the engaging portion 22a interposed therebetween. By providing the slit 22c, the portion where the engaging portion 22a is formed, that is, the portion between the slits 22c is easily bent, and the opening and closing of the cover 19 can be facilitated. Further, when the cover 19 is closed, the engagement portion 22a is engaged with the cover 19, so that the state where the cover 19 is closed is reliably maintained. Further, the cover 19 is formed with a hooking portion 19a for hooking a finger when the cover is opened and closed, so that the opening and closing of the cover 19 can be further facilitated.

  The surrounding rib 29 is formed on the opposite side of the inclined portion 22f with the engaging portion 22a interposed therebetween, and the cover 19 that is engaged with the engaging portion 22a is further restrained from rotating in the closing direction. A matching restriction part 22b is provided. The over-engagement restricting portion 22 b is formed so as to protrude toward the region surrounded by the surrounding rib 29. The over-engagement restricting portion 22 b is a second protrusion that abuts the end portion on the opposite side of the rotation shaft 28 of the cover 19 and restricts the position of the cover 19. By providing the over-engagement restricting portion 22b, the position of the cover 19 in the closed state can be stabilized. Thereby, it can prevent that the cover 19 and the engaging part 22a are engaged firmly, and the cover 19 becomes difficult to open.

  Further, an inner rib 30 facing the inner side surface of the surrounding rib 29 is formed on the face of the fan casing 22 facing the opening side, and the cover 19 is fitted between the surrounding rib 29 and the inner rib 30. Thereby, in a state where the cover 19 is closed, a contact portion between the cover 19 and the fan casing 22 becomes an imprint structure, and moisture and dust are less likely to enter the electric wire connecting portion 20.

  Although the example in which the engaging portion 22a is a protrusion has been described, the engaging portion 22a is a hole formed in the surrounding rib 29, and the cover 19 is fitted into the hole and is in an engaged state. It doesn't matter. Moreover, although demonstrated about the ventilation fan, you may employ | adopt the structure of the electric wire connection part 20 mentioned above to the system member used in combination with an air blower, an air conditioner, and them.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  12 Duct connection port, 13 Duct, 16 Electric motor, 17 Fan, 19 Cover, 20 Electric wire connection part, 21 Box body, 22 Fan casing, 22a Engagement part (first protrusion), 22b Over-engagement restriction part (first 2 projection), 22c slit, 22d bell mouth part, 22e outlet, 22f inclined part, 23 duct connection frame, 24 shutter, 26 spring fixing part, 27 terminal block, 27a insertion hole, 28 rotating shaft, 29 enclosure Ribs, 30 inner ribs, 31 decorative grille, 32 springs, 100 ventilation fans.

Claims (3)

A box having a box shape with one side open;
A fan housed inside the box;
An electric motor for rotating the fan;
A fan casing that houses the fan inside the box;
An electric wire connecting portion provided on a surface facing the opening side of the fan casing;
A cover that covers the wire connection portion,
The cover is supported by the fan casing and is rotatable about a rotation axis parallel to the opening,
The fan casing is formed with a surrounding rib that surrounds the wire connecting portion,
The encircling rib is formed with an engaging portion that engages with an end portion of the cover that is opposite to the rotating shaft and restricts the cover from rotating in the opening direction.
The both sides of the engaging portion of said enclosing rib, have a slit extending toward the root side from the tip of said enclosing rib,
Of the surfaces constituting the surrounding ribs, the surface on the back side of the surface on which the engaging portion is formed is such that the surface of the region sandwiched between the slits on both sides is the surface other than the region other than the region sandwiched on both sides of the slits. A ventilation fan characterized by being positioned forward in a direction toward the region surrounded by the surrounding ribs . The engagement portion is a first protrusion that protrudes toward a region surrounded by the surrounding ribs,
The surrounding rib is formed with a second protrusion that is formed on the opposite side of the opening with the first protrusion interposed therebetween and protrudes toward a region surrounded by the surrounding rib. The ventilation fan according to claim 1. An inner rib facing the inner side surface of the surrounding rib is formed on the surface of the fan casing facing the opening side,
The ventilation fan according to claim 1 or 2, wherein the cover is fitted between the surrounding rib and the inner rib.

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