JP2014016048A - Ventilation fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation fan capable of carrying out tension stop of a power cord without increasing the number of components.SOLUTION: The ventilation fan includes an approximate cylindrical air channel 11, a body frame 10 having a flange 14 connected to a peripheral edge portion of an intake port at a front side of the air channel 11 and radially expanded, and a rising portion 15 connected to an edge of the flange 14 and projecting to a back side, an air blower 20 having an impeller 21 rotated in the air channel 11, a power cord 50 having a power plug 51 and connected to the air blower 20, and a connection port protective cover 30 disposed at a back side of the body frame 10 while covering electrical connection components mounted on a back face of the flange 14. The power cord 50 is restricted in its vertical movement by being held by a pair of ribs disposed on the back face of the flange 14 while keeping a clearance gap in the vertical direction, and restricted in its horizontal movement by being held between an inner face of the connection portion protective cover 30 and the back face of the flange 14.

Description

  The present invention relates to a ventilation fan.

  There is known a ventilating fan that is inserted into a pipe or duct that communicates indoors and outdoors and is attached from the indoor side, and exhausts indoor air to the outside for ventilation. Such a ventilation fan includes a cylindrical wind tunnel inserted into a pipe, a duct, and the like, and a blower in which a propeller-type impeller rotates in the wind tunnel. Also, a radially extending flange is continuously connected to the outer periphery of the indoor opening of the cylindrical wind tunnel, and a power cord having a power plug for supplying power to the blower is connected to the rear side of the flange. It is common that

  Such a ventilation fan has a pipe or duct installed in a hole formed in the wall or ceiling, etc., and the ventilation fan body is inserted into the pipe or duct, and the power cord and power plug are connected to the surface of the wall or ceiling surface. The construction to pull out to the side is common (see, for example, Patent Document 1).

As described in Patent Document 1, a power cord having a power plug has been conventionally tension-tightened using a component such as a cord clip.
Further, “the concave portion 8 of the clamping member 9 is applied to the power cord 7, and after the power cord 7 is clamped by the pair of clamping members 9, the engagement groove 5 of the support piece 6 is engaged with the non-concave portion side of the clamping member 9. There is also proposed a ventilation fan configured to fit the holding member 9 to the support piece 6 and hold the power cord 7 so as to do so (see, for example, Patent Document 2).

Utility Model Registration No. 2573710 (2nd page, FIG. 8) Japanese Unexamined Patent Publication No. 2000-121118 (second page, FIG. 1)

  In the ventilation fans described in Patent Literature 1 and Patent Literature 2, a dedicated component for stopping the power cord such as a cord clip and a resin molded component is added. For this reason, the number of parts increased, manufacturing cost became high, and the subject that an assembling property deteriorated occurred.

  The present invention has been made to solve the above-described problems, and provides a ventilation fan capable of tensioning a power cord without increasing the number of parts.

  The ventilating fan according to the present invention has a substantially cylindrical wind tunnel, a flange that is connected to the peripheral edge of the suction port on the front side of the wind tunnel and that extends in the radial direction, and is connected to the edge of the flange and protrudes to the back side A main body frame having a rising portion, a blower having an impeller rotating in the wind tunnel, a power plug, a power cord connected to the blower, and an electrical connection component attached to the back of the flange so as to cover And a protective cover attached to the back side of the main body frame, and the power cord is sandwiched between a pair of ribs arranged with a gap in the vertical direction on the back side of the flange, The movement is restricted and is held between the inner surface of the protective cover and the rear surface of the flange to restrict the movement in the horizontal direction.

  According to the present invention, the tension retaining structure of the power cord is realized by the back surface of the flange and the protective cover, and the protective cover serves as both a cover for the electrical connection parts and a configuration for retaining the tension of the power cord. For this reason, it is not necessary to separately provide a tension stopper such as a cord clip, and the number of parts can be reduced and the manufacturing cost can be reduced.

It is a schematic sectional drawing which shows the state which attached the ventilation fan which concerns on embodiment to the pipe. It is a top view, a rear view, and a right side view of a ventilation fan according to an embodiment. It is a rear view which shows the state which removed the connection part protection cover and terminal block of the ventilation fan which concern on embodiment. It is a back side perspective view of the ventilation fan which concerns on embodiment. It is a side view of the attachment spring which concerns on embodiment. It is a perspective view of the attachment spring which concerns on embodiment. It is a schematic sectional drawing of the attachment spring vicinity of the ventilation fan which concerns on embodiment. It is a principal part enlarged view of the attachment destination vicinity of the attachment spring of the back side of the ventilation fan which concerns on embodiment. It is a figure which shows the outer surface of the connection part protective cover which concerns on embodiment. It is a figure which shows the inner surface of the connection part protective cover which concerns on embodiment. It is a perspective view of the outer surface of the connection part protective cover which concerns on embodiment. It is a figure explaining the attachment structure of the connection part protection cover of the ventilation fan which concerns on embodiment. It is a figure explaining the attachment structure of the connection part protection cover of the ventilation fan which concerns on embodiment. It is a figure explaining the attachment structure of the connection part protection cover of the ventilation fan which concerns on embodiment. It is a perspective view of the connection part protection cover of the power switch terminal part vicinity of the ventilation fan which concerns on embodiment. It is a schematic sectional drawing of the power switch terminal part vicinity of the ventilation fan which concerns on embodiment. It is a back surface perspective view of the terminal block vicinity of the ventilation fan which concerns on embodiment. It is a perspective view of the terminal block of the ventilation fan which concerns on embodiment. It is a schematic sectional drawing explaining the attachment structure of the terminal block of the ventilation fan which concerns on embodiment. It is a rear view of the ventilation fan which concerns on embodiment, and is a figure explaining tension stop of a power cord. It is a schematic sectional drawing explaining the tension stop structure of the power cord of the ventilation fan which concerns on embodiment.

  Embodiments of a ventilation fan according to the present invention will be described below with reference to the drawings. In addition, this invention is not limited by the form of drawing shown below.

Embodiment.
Drawing 1 is an outline sectional view showing the state where the ventilation fan concerning an embodiment was attached to the pipe. FIG. 2 is a plan view (FIG. 2A), a rear view (FIG. 2B), and a right side view (FIG. 2C) of the ventilation fan according to the embodiment, with the decorative grille removed. Indicates the state. FIG. 3 is a rear view showing a state in which the connection portion protection cover and the terminal block of the ventilation fan according to the embodiment are removed. FIG. 4 is a rear perspective view of the ventilation fan according to the embodiment.
In addition, the same code | symbol is attached | subjected to the same structure in each figure shown below including FIGS. 1-4. In addition, in the following drawings including FIGS. 1 to 4, the relationship between the sizes of the constituent members may be different from the actual ones. Further, in the following description, terms for indicating directions (for example, “up”, “down”, “right”, “left”, “front”, “back”, etc.) are used as appropriate for easy understanding. This is for explanation and these terms do not limit the present invention.

[Overall structure of ventilation fan]
As shown in FIGS. 1-4, the ventilation fan 1 which concerns on this Embodiment is inserted and installed from the indoor side in the pipe 100 and duct which connect indoors and the outdoors. The ventilation fan 1 includes a main body frame 10, a main body 2 having a blower 20 assembled to the main body frame 10, and a decorative grill 3. In the following description, the left side of FIG. 1 is referred to as “front side”, and the right side of FIG. 1 is referred to as “back side”.

  The main body frame 10 is made of a synthetic resin or the like, and has a substantially cylindrical wind tunnel 11 inserted into a pipe 100 or a duct. A suction port 12 for sucking air into the wind tunnel 11 is opened at the front portion of the wind tunnel 11, and a peripheral portion 13 of the suction port 12 is configured in a bell mouth shape. A front surface structure is integrally formed on the peripheral portion 13. The front structure has a substantially square (or round) flange 14 projecting outward from the peripheral edge portion 13 in the radial direction, and a rising portion 15 rising from the edge of the flange 14 toward the back surface. The end surface of the rising portion 15 comes into contact with the wall surface of the room when attached to the room. The back surface of the main body frame 10 is formed in a concave shape by the flange 14 and the rising portion 15.

  The blower 20 includes a propeller-type impeller 21 and an electric motor 22 that has a rotating shaft 23 and rotates the impeller 21. The blower 20 is attached to a motor attachment structure 60 provided on the back side of the wind tunnel 11 of the main body frame 10.

  The motor mounting structure 60 is provided on the back side of the wind tunnel 11 at intervals in the circumferential direction. The motor mounting structure 60 includes four leg portions 61 extending rearward along the center line direction of the wind tunnel 11, and ends of the leg portions 61. A bridge portion 62 connected so as to extend radially inward from the portion, and a motor cover 63 supported by the bridge portion 62 at the center of the wind tunnel 11. The four leg portions 61 are all located on the radially inner side of the outer periphery of the wind tunnel 11. An attachment spring 64 extending outward in the radial direction is provided at a bridging portion 62 (referred to as distinct from the bridging portion 62A) connected to one of the four leg portions 61 (referred to as distinct from the leg portion 61A). It is installed. As will be described in detail later, the mounting spring 64 is provided with a warp in order to hold the main body 2 in the pipe 100 or the duct by a radially expanding elastic force.

  The outer shell on the back side of the electric motor 22 is provided with a flange portion 221 that projects outward in the radial direction so that the rotating shaft 23 projects forward from the tip of the motor cover 63 onto the center line of the wind tunnel 11. Thus, the flange portion 221 is screwed to the motor mounting structure 60. An impeller 21 is mounted on a rotary shaft 23 extending on the center line of the wind tunnel 11 so as to be included in the wind tunnel 11. The impeller 21 rotates in the wind tunnel 11 when the electric motor 22 operates and the rotating shaft 23 rotates.

  As shown in FIG. 3, the power switch 16 of the ventilation fan 1 includes an operation unit 161 operated by a user and a pair of power switch terminal units 162. The operation unit 161 is attached so as to be exposed from the main body frame 10 so that the user can perform an ON / OFF operation.

  As shown in FIG. 3, the power switch terminal portion 162 of the power switch 16 is accommodated in the concave portion on the back surface of the flange 14. Further, the flange 14 is provided with frame-shaped closed-end connector receiving ribs 144a and 144b having a receiving space inside, and the closed-end connector receiving ribs 144a and 144b are respectively connected to the closed end. A child 17 is stored. In order to prevent contact with the electrical connection parts such as the power switch terminal 162 and the closed end connector 17, as shown in FIG. 2, the connection covering the power switch terminal 162 and the closed end connector 17 of the power switch 16. A part protection cover 30 is attached to the back surface of the flange 14.

  Further, as shown in FIG. 2, a rotary terminal block 40 capable of connecting an internal wiring connected to the electric motor 22 and an external power supply cable is provided at one corner of the rear surface of the flange 14. In the ventilation fan 1 of the present embodiment, an external power supply wire is connected to the terminal block 40, and a power cord 50 connected to the motor 22 via an internal wiring having a power plug 51 (see FIGS. 20 and 21). The power supply connection method can be selected according to the installation environment of the ventilation fan 1.

  The decorative grill 3 covers the flange 14 and the rising portion 15 which are the front structure of the main body frame 10 from the front side. The decorative grill 3 is detachably attached to the main body 2 by claw fitting or the like, and the decorative grill 3 can be easily cleaned by removing it. A plurality of decorative grills 3 having different designs and ventilation characteristics may be replaceable, and in this way, a decorative grill 3 having a design and ventilation characteristics suitable for the environment in which the ventilation fan 1 is installed for one type of main body 2. Can be attached.

[Mounting spring mounting structure]
FIG. 5 is a side view of the mounting spring according to the embodiment. FIG. 6 is a perspective view of the mounting spring according to the embodiment. The mounting spring 64 of the present embodiment is a leaf spring member made of, for example, a stainless steel strip for springs. As shown in FIGS. 5 and 6, the attachment spring 64 includes an attachment portion 642 formed with a claw 641 made of a triangular cut-and-raised piece, and an engagement portion formed by bending the end portion of the attachment portion 642 approximately 90 °. The stop portion 643, the inclined portion 644 formed by bending about 30 ° from the locking portion 643, and the tip portion 645 formed by bending about 20 ° from the tip of the inclined portion 644. The bent portion between the inclined portion 644 and the tip portion 645 is in the opposite direction to the other bent portions. In the example of FIG. 5, the length of the attachment portion 642 is 6 mm, the length of the locking portion 643 is 5.5 mm, the length of the inclined portion 644 is 20 mm, and the length of the tip portion 645 is 5 mm. In addition, the numerical value of each part of the attachment spring 64 illustrated in FIG. 5 is an example, and does not limit the present invention.

FIG. 7 is a schematic cross-sectional view of the vicinity of the attachment spring of the ventilation fan according to the embodiment, and shows a state in which the ventilation fan is installed in the pipe 100. FIG. 8 is an enlarged view of the main part in the vicinity of the attachment destination of the attachment spring on the back side of the ventilation fan according to the embodiment, and shows a state where the attachment spring is removed.
A slit-like attachment spring attachment hole 65 is formed in the bridging portion 62A. The attachment spring 64 is attached to the bridging portion 62 </ b> A by fitting the claw 641 and the attachment portion 642 of the attachment spring 64 into the attachment spring attachment hole 65. The claw 641 is a substantially triangular cut-and-raised piece. When the mounting spring 64 is about to be pulled out, the claw 641 bites into the wall surface of the mounting spring mounting hole 65 so that the mounting spring 64 is easily mounted. The spring mounting hole 65 does not come off. Since the claw 641 is caught on the side surface of the mounting spring mounting hole 65, the mounting spring 64 can be removed from the mounting spring mounting hole 65 when the ventilation fan 1 is inserted into the pipe 100 or the duct or when the ventilation fan 1 is removed from the pipe 100 or the duct. It is hard to come off.

  In a state where the attachment spring 64 is attached to the attachment spring attachment hole 65, the attachment portion 642 and the claw 641 are in contact with the inner wall of the attachment spring attachment hole 65, and a part of the locking portion 643 is a wall of the bridging portion 62A. A part (referred to as an attachment spring contact portion 66). The attachment spring attachment hole 65 and the attachment spring contact portion 66 function as an attachment spring attachment portion 67 for attaching the attachment spring 64 to the bridging portion 62A.

  As shown in FIG. 7, the tip portion 645 of the mounting spring 64 is provided such that when the ventilation fan 1 is installed on the ceiling (for example, the ventilation flow is directed in the vertical direction), the ventilation fan 1 is connected to the pipe 100 or duct. The pipe 100 or the inner wall of the duct is configured to be caught so as not to fall off. More specifically, the bent portion of the mounting spring 64 from the inclined portion 644 to the tip portion 645 is bent in a direction in which the tip portion 645 is separated from the wind tunnel 11, and the angle at which the tip portion 645 and the pipe 100 intersect is relatively long. By becoming large, the tip end portion 645 is easily caught on the inner wall of the pipe 100 or the duct. Further, the distal end portion 645 is pressed against the inner wall of the pipe 100 by the expanding elastic force of the mounting spring 64. For this reason, the ventilation fan 1 can be temporarily fixed to the inner wall of the pipe 100 or the duct by the attachment spring 64 until the ventilation fan 1 is fixed to the wall or the like with wood screws or the like. Moreover, when removing the ventilation fan 1 from the pipe 100 or duct, the ventilation fan 1 can be easily removed by pulling out while rotating the ventilation fan 1 in the circumferential direction.

Here, in a state where the ventilation fan 1 is inserted into the pipe 100 or the duct, the attachment spring 64 is radially inward so that the tip 645 approaches the attachment portion 642 fixed in the attachment spring attachment hole 65. It is elastically deformed so that it narrows toward the center.
And, as shown in FIGS. 7 and 8, the bridging portion 62A of the present embodiment is a case where the ventilation fan 1 is mounted in the pipe 100 or the duct and the mounting spring 64 is deformed as described above. The portion other than the attachment spring attachment portion 67 has a shape that does not come into contact with the attachment spring 64. More specifically, the space portion 621 is formed by notching a part of the bridging portion 62A that is continuous with the leg portion 61A, and when the attachment spring 64 is deformed narrowly, a part of the attachment spring 64 becomes this space. Located in the portion 621, the attachment spring 64 does not contact the bridging portion 62 </ b> A other than the attachment spring attachment portion 67.

  As shown in FIG. 7, in the state where the ventilation fan 1 is mounted in the pipe 100 or the duct and the mounting spring 64 is deformed as described above, the mounting spring 64 is separated from the mounting spring mounting hole 65 and the mounting spring contact portion 66. In addition to the mounting spring mounting portion 67, the end portion 611 of the leg portion 61A having an end surface shape chamfered by C1 is brought into contact. That is, the attachment spring 64 has a structure that comes into contact with other members at two places, that is, the attachment spring attachment portion 67 (the attachment spring attachment hole 65 and the attachment spring contact portion 66) and the end portion 611 of the leg portion 61A. By doing so, the spring load of the mounting spring 64 is applied to the mounting spring mounting portion 67 (the mounting spring mounting hole 65 and the mounting spring contact portion 66) of the bridging portion 62A and the end 611 of the leg portion 61A. The load of the mounting spring 64 is not applied to the wind tunnel 11. For this reason, the inner diameter of the wind tunnel 11 is not reduced and deformed by the deformation of the mounting spring 64, and the contact between the wind tunnel 11 and the impeller 21 due to the reduced deformation of the wind tunnel 11 can be suppressed. Further, since the load of the mounting spring 64 does not concentrate on the wind tunnel 11, the wind tunnel 11 can be made of a synthetic resin such as an inexpensive PP material (polypropylene material) or a recycled material. The effect of reducing the environmental burden by using recycled materials can be obtained. Thus, the freedom degree of the material which comprises the wind tunnel 11 can be raised. Moreover, since the load of the attachment spring 64 does not concentrate on the wind tunnel 11, the thickness of the wind tunnel 11 can be reduced, and the synthetic resin material etc. which comprise the wind tunnel 11 can be reduced.

  It is preferable that the bridging portion 62A and the leg portion 61A have a strength that can sufficiently withstand the spring load of the mounting spring 64 when the ventilation fan 1 is inserted into the pipe 100 or the duct. In the present embodiment, an example in which the attachment springs 64 are provided on only one of the four bridging portions 61 has been described. However, the number of attachment springs 64 is not limited thereto, and a plurality of attachment springs 64 is provided. May be attached in the same manner.

[Connection protection cover]
FIG. 9 is a diagram illustrating an outer surface of the connection portion protection cover according to the embodiment. FIG. 10 is a diagram illustrating an inner surface of the connection portion protection cover according to the embodiment. FIG. 11 is a perspective view of the outer surface of the connection portion protection cover according to the embodiment.
The connection portion protection cover 30 is a member that covers electrical connection parts such as the power switch 16 and the closed end connector 17 attached to the back surface of the flange 14 from the back surface side of the flange 14.

12A and 12B are diagrams for explaining the attachment structure of the connection part protective cover of the ventilation fan according to the embodiment. FIG. 12A is a plan view of the ventilation fan 1, and FIG. 12B is a diagram of FIG. FIG. 12C is a rear view of the ventilating fan 1 with the connection portion protection cover 30 removed. Note that FIG. 12C is the same as FIG. 3, but for convenience of explanation, reference numerals are attached mainly to the configuration related to the attachment structure of the connection portion protection cover 30.
As shown in FIGS. 9 to 12, the outer peripheral portion of the connection portion protection cover 30, which is located on the outer peripheral portion of the rising portion 15 when attached to the main body frame 10, is outward. A protruding mounting claw 302 is provided. Also, as shown in FIG. 12, cover mounting holes 152 into which the mounting claws 302 are inserted are formed at three places on the rising portion 15, as with the mounting claws 302. When the attachment claw 302 of the connection part protection cover 30 is inserted into the cover attachment hole 152 of the rising part 15, the attachment claw 302 is caught by the edge of the cover attachment hole 152, and the connection part protection cover 30 can be attached to the main body frame 10. it can.

FIG. 13 is a view for explaining the attachment structure of the connection portion protective cover of the ventilation fan according to the embodiment, and shows a schematic cross-sectional view taken along the line A in FIG. FIG. 14 is a view for explaining the attachment structure of the connection part protective cover of the ventilation fan according to the embodiment, and shows a schematic cross-sectional view taken along line B of FIG.
As shown in FIGS. 12 and 13, on the back surface of the flange 14, there is provided a cover mounting claw 142 that protrudes toward the back surface and has a tip formed in a bowl shape. Further, as shown in FIGS. 9 to 11 and 13, the connection portion protection cover 30 can be locked with the opening 303 a into which the cover mounting claw 142 is inserted and the hook-shaped tip of the cover mounting claw 142. A claw mounting portion 303 having a proper locking portion 303b is provided. Cover the connection part protection cover 30 on the back surface of the flange 14, insert the cover attachment claw 142 of the flange 14 into the opening 303 a of the claw attachment part 303, and hook the cover attachment claw 142 on the locking part 303 b of the claw attachment part 303. And the connection part protection cover 30 can be attached to the flange 14. Due to the locking structure of the cover mounting claw 142 and the locking portion 303b, the connection portion protection cover 30 is prevented from being detached from the flange 14.

  As described above, in the present embodiment, the connection portion protective cover is formed by the mounting structure using the mounting claw 302 and the cover mounting hole 152 shown in FIG. 12 and the mounting structure using the cover mounting claw 142 and the claw mounting portion 303 shown in FIG. 30 is attached to the flange 14. Since the structure in which the claw is provided on the connection portion protective cover 30 side and the structure in which the claw is provided on the flange 14 are used in combination, the attachment strength can be improved as compared with the structure in which the claw is provided only on one side.

Next, a configuration for suppressing entry of dust and moisture into the connection part protection cover 30 will be described.
As shown in FIGS. 10, 13, and 14, a groove 301 having a substantially U-shaped cross section is provided along a part of the outer peripheral portion on the inner surface side of the connection portion protective cover 30. As shown in FIGS. 13 and 14, a fitting rib 141 that can be inserted into the groove 301 is formed on the back surface of the flange 14. When the connection portion protection cover 30 is attached to the main body frame 10, the fitting rib 141 is fitted into the groove 301 and comes into contact with the inner surface of the groove 301, and a labyrinth seal structure is formed by the fitting rib 141 and the groove 301. The Thus, by providing the labyrinth seal structure at the portion where the connection portion protection cover 30 and the flange 14 are abutted, it is possible to prevent the entry of dust and moisture from the outside to the inside of the connection portion protection cover 30. Note that the labyrinth seal structure may be configured by providing a groove on the back surface of the flange 14 and providing a rib fitted to the groove on the connection portion protection cover 30.

  Further, as shown in FIGS. 13 and 14, in the vicinity of the tip of the rising portion 15 constituting a part of the main body frame 10, the side farther from the side closer to the flange 14 spreads radially outward. A stepped portion 151 formed in a step shape is provided. When the connection portion protection cover 30 is attached to the main body frame 10, the end portion of the connection portion protection cover 30 is fitted to the corner portion of the step portion 151, and the end portion of the connection portion protection cover 30 and the step portion 151 come into contact with each other. . As described above, by providing a step structure at a portion where the connection portion protection cover 30 and the rising portion 15 are abutted, it is possible to prevent dust and moisture from entering the connection portion protection cover 30 from the outside to the inside. Note that a stepped portion may be provided on the outer peripheral end surface of the connection portion protective cover 30 and a stepped structure in which the end surface of the rising portion 15 is brought into contact with the stepped portion may be provided.

  In this way, a fitting structure is provided by the connection portion protection cover 30 and the step portion 151 of the rising portion 15, and the groove 301 and the flange 14 of the connection portion protection cover 30 are fitted in a portion different from this fitting structure. By providing the labyrinth structure with the joint rib 141, it is possible to prevent dust and moisture from entering the connection portion protective cover 30 in which the electrical connection parts such as the power switch 16 and the closed end connector 17 are accommodated. it can. For this reason, it is possible to suppress the tracking due to the entry of dust and moisture into the connection portion protection cover 30 and improve the durability of the ventilation fan 1. Moreover, since the structure as described above is realized by the flange 14 and the rising portion 15 constituting the part of the main body frame 10 and the connection portion protective cover 30, it is necessary to provide other components such as a fire spread prevention component, for example. Absent. For this reason, the number of parts can be reduced, and the manufacturing cost can be reduced and the assemblability can be improved.

  FIG. 15 is a perspective view of the connection portion protective cover in the vicinity of the power switch terminal portion of the ventilation fan according to the embodiment. FIG. 16 is a schematic cross-sectional view of the vicinity of the power switch terminal portion of the ventilation fan according to the embodiment. As shown in FIGS. 15 and 16, a rib 304 between the power switch terminals is provided at a position separating the two power switch terminal portions 162. In the present embodiment, the power switch terminal ribs 304 are substantially flat plate-like members that are provided on the inner surface side of the connection portion protection cover 30, that is, on the side facing the flange 14 and project toward the flange 14 side. As shown in FIG. 16, the tip end of the rib 304 between the power switch terminals is in contact with or close to the surface of the flange 14, and there is dust between the tip of the rib 304 between the power switch terminals and the surface of the flange 14. It is difficult for foreign substances such as these to circulate.

  Thus, by separating the pair of power switch terminal portions 162 by the ribs 304 between the power switch terminals, energization due to dust and the like being interposed between the pair of power switch terminal portions 162 can be suppressed. For this reason, in addition to the fitting structure by the connection part protection cover 30 and the step part 151 of the rising part 15 described above, and the labyrinth structure by the groove 301 of the connection part protection cover 30 and the fitting rib 141 of the flange 14, Tracking can be suppressed. In the present embodiment, the member (the power switch terminal rib 304) that separates the pair of power switch terminal portions 162 is realized by the connection portion protection cover 30, so there is no need to provide other members, and the number of components As a result, the manufacturing cost can be reduced and the assemblability can be improved.

[Terminal block]
FIG. 17 is a rear perspective view of the vicinity of the terminal block of the ventilation fan according to the embodiment. 17A shows the terminal block 40 lying down, FIG. 17B shows the terminal block 40 standing up, and FIG. 17C shows the terminal block 40 and the decorative grill 3 from FIG. 17A. The removed state is shown. FIG. 18 is a perspective view of the terminal block of the ventilation fan according to the embodiment. The terminal block 40 is made of a flame-retardant and electrically insulating synthetic resin, and includes a connection terminal for connecting an external power supply wire. The terminal block 40 is pivotally supported by the main body frame 10 via a pair of first rotation shafts 41 a and second rotation shafts 41 b that protrude to the side of the terminal block 40. The terminal block 40 can fall down and stand in a range of about 0 to 90 degrees in a plane perpendicular to the back surface of the flange 14.

  The attachment structure of the terminal block 40 will be described with reference to FIGS. FIG. 19: is a schematic sectional drawing explaining the attachment structure of the terminal block of the ventilation fan which concerns on embodiment. FIG. 19 shows a cross section taken along line C of FIG.

  As shown in FIG. 17C, a terminal block mounting hole 153 is opened in the rising portion 15 of the main body frame 10. One first rotating shaft 41 a of the terminal block 40 is rotatably inserted into the terminal block mounting hole 153.

As shown in FIGS. 17C and 19, on the back side of the flange 14, a receiving portion 143 having a surface shape with a substantially arc-shaped cross section curved along a part of the outer shape of the second rotation shaft 41 b. Is provided. Further, on the inner surface side of the connection portion protection cover 30, a rotation shaft pressing portion 305 having a surface shape with a substantially arc-shaped cross section curved along a part of the outer shape of the second rotation shaft 41b is provided. The second rotation shaft 41b is held by the receiving portion 143 and the rotation shaft pressing portion 305 so as to be rotatable.
Since both the first rotation shaft 41a and the second rotation shaft 41b are supported on the entire outer periphery, the stability when the terminal block 40 is attached is good.

  When the terminal block 40 is attached to the main body frame 10, first, the first rotation shaft 41 a of the terminal block 40 is connected to the terminal block mounting hole 153 of the rising portion 15 in a state where the connection portion protection cover 30 is not attached. The other second rotation shaft 41 b is placed on the receiving portion 143 of the flange 14. In this state, the connection portion protection cover 30 is attached to the main body frame 10. In this way, the second rotation shaft 41 b is sandwiched between the receiving portion 143 of the flange 14 and the rotation shaft pressing portion 305 of the connection portion protection cover 30. The terminal block 40 is supported at both ends with respect to the main body frame 10 by a pair of first rotation shafts 41 a and second rotation shafts 41 b that protrude outward from the side walls of the terminal block 40. According to the mounting structure of the terminal block 40 of the present embodiment, the first rotating shaft 41a and the second rotating shaft 41b are used as bearings (the terminal block mounting hole 153, the receiving portion 143, and the rotating shaft pressing portion 305). At the time of attachment, it is not necessary to elastically deform members such as the terminal block 40, and it is easy to perform attachment work in high places and narrow places such as walls and ceilings.

  Thus, when connecting an external power supply wire to the terminal block of the terminal block 40 attached to the main body frame 10, an operator can perform the work with the terminal block 40 in an upright state. When the connection of the external power supply wires is completed, the operator turns the terminal block 40 into a lying state. The terminal block 40 in the lying state fits within the height range of the rising portion 15 of the main body frame 10.

[Tension stop for power cord]
As described above, the ventilation fan 1 according to the present embodiment is configured to be connected to the power supply by the power cord 50 in addition to receiving power supply from the external power supply wire connected to the terminal block 40. Hereinafter, a configuration related to the power cord 50 will be described.
FIG. 20 is a rear view of the ventilating fan according to the embodiment, and is a diagram for explaining the tension stop of the power cord. FIG. 21 is a schematic cross-sectional view illustrating the tension retaining structure of the power cord of the ventilation fan according to the embodiment.

  The ventilation fan 1 of the first embodiment includes a power cord 50 having a power plug 51 at one end. The other end of the power cord 50 is electrically connected to the electric motor 22.

  On the rear side of the flange 14, two frame-shaped closed-end connector storage ribs 144 a and 144 b are formed so as to project inside the space for storing the two closed-end connectors 17. Further, on the back surface of the flange 14, a power cord holding rib 145 is provided with a predetermined gap in the height direction (vertical direction) from a portion extending substantially horizontally in the outer periphery of the one closed-end connector receiving rib 144a. Projected. As shown in FIGS. 19 and 20, between the part of the outer periphery of the closed-end connector receiving rib 144a and the power cord holding rib 145, the power cord 50 has a wide surface facing the substantially vertical direction. Is passed through. The movement of the power cord 50 in the vertical direction is restricted by a pair of ribs including a part of the outer periphery of the closed-end connector housing rib 144a and the power cord holding rib 145. The gap distance between the substantially horizontal extending portion of the outer periphery of the closed-end connector receiving rib 144a and the power cord holding rib 145 is substantially the same as the narrower length of the power cord 50. It is about 2 mm.

  Further, as shown in FIG. 21, a power cord tension retaining rib 306 projects from the inner surface side of the connection portion protection cover 30 toward the flange 14 side. The protruding length of the power cord tension retaining rib 306 is such that a predetermined gap is provided between the tip of the power cord tension retaining rib 306 and the rear surface of the flange 14 in a state where the connection portion protection cover 30 is attached to the main body frame 10. The length is such that it is formed. The gap between the front end of the power cord tension retaining rib 306 and the rear surface of the flange 14 is substantially the same as the length of the wider side of the power cord 50, and the front end of the power cord tension retaining rib 306 and the rear surface of the flange 14 are the same. A power cord 50 is sandwiched therebetween. By doing so, the horizontal movement of the power cord 50 is restricted. In this embodiment, an example in which the power cord tension retaining rib 306 is provided on the inner surface of the connection portion protection cover 30 is shown. However, a rib is provided on the back side of the flange 14, and this rib and the inner surface of the connection portion protection cover 30 are provided. The power cord 50 may be held between the two.

  In this way, the power cord 50 is sandwiched between a part of the outer periphery of the closed end connector storage rib 144a and the power cord sandwiching rib 145, and the vertical movement is restricted, and the power cord tension retaining rib 306 is regulated. Is held between the front end of the flange 14 and the rear surface of the flange 14 to restrict the horizontal movement, so that the tension is stopped against the rear surface of the flange 14. By providing the tension stopper structure, it is possible to prevent the power cord 50 from being loose or misaligned. In addition, according to the present embodiment, the structure for stopping the power cord 50 is realized by the structures provided respectively on the flange 14 and the connection portion protection cover 30. For this reason, the power cord 50 can be tensioned without separately providing a tension clip component such as a cord clip, so that the number of components can be reduced and the manufacturing cost can be reduced. Moreover, since the tension | tensile_strength stop of the power cord 50 can be performed by the connection part protective cover 30 which can be attached without using components, such as a screw, by nail | claw fitting, workability | operativity can be improved compared with the case where a cord clip is provided. .

  In addition, the terminal block 40 mounting structure is based on the structure of the flange 14 and the connection portion protection cover 30 that are used in both the case of using the terminal block 40 and the case of using the power cord 50 as the power connection method to the motor 22. And the tension stop structure of the power cord 50 is realized. For this reason, even if it is a case where which power supply connection system is used, the main body flame | frame 10 and the connection part protection cover 30 can be used in common, and the ventilation fan 1 can be manufactured, and manufacturing cost and management cost can be reduced.

  DESCRIPTION OF SYMBOLS 1 Exhaust fan, 2 main body, 3 makeup | decoration grill, 10 main body frame, 11 wind tunnel, 12 suction inlet, 13 peripheral part, 14 flange, 141 fitting rib, 142 cover attachment nail, 143 receiving part, 144a, 144b closed end connector storage Rib, 145 Power cord holding rib, 15 Standing part, 151 Step part, 152 Cover mounting hole, 153 Terminal block mounting hole, 16 Power switch, 161 Operation part, 162 Power switch terminal part, 17 Closed end connector, 20 Blower , 21 Impeller, 22 Electric motor, 221 Flange part, 23 Rotating shaft, 30 Connection part protective cover, 301 Groove, 302 Mounting claw, 303 Claw mounting part, 303a Opening part, 303b Locking part, 304 Power switch terminal rib, 305 Rotating shaft pressing part, 306 Power cord tension retaining rib, 40 Terminal block, 41a First rotating shaft, 41b Second rotating shaft, 50 power cord, 51 power plug, 60 motor mounting structure, 61 leg, 61A leg, 611 end, 62 bridging part, 62A bridging part, 63 motor Cover, 64 Attachment spring, 641 Claw, 642 Attachment part, 643 Locking part, 644 Inclined part, 645 Tip part, 65 Attachment spring attachment hole, 66 Attachment spring contact part, 67 Attachment spring attachment part, 100 Pipe

Claims (3)

A substantially cylindrical wind tunnel,
A main body frame having a flange connected to the peripheral edge of the suction port on the front side of the wind tunnel and extending in the radial direction, and a rising portion connected to the edge of the flange and protruding to the back side;
A blower having an impeller rotating in the wind tunnel;
A power cord having a power plug and connected to the blower;
A protective cover attached to the back side of the main body frame so as to cover electrical connection parts attached to the back side of the flange;
The power cord is
The movement in the vertical direction is regulated by being sandwiched between a pair of ribs arranged with a gap in the vertical direction on the back surface of the flange,
A ventilation fan characterized by being sandwiched between an inner surface of the protective cover and a rear surface of the flange to restrict horizontal movement. A tension retaining rib protruding from the inner surface of the protective cover;
The ventilation fan according to claim 1, wherein the power cord is sandwiched between the tension retaining rib and a back surface of the flange. The ventilation fan according to claim 1 or 2, wherein the protective cover is attached to the main body frame by claw fitting.