JPH0448415Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a ventilation fan installed above a microwave oven, and particularly relates to the installation of a changeover switch.

[Conventional technology]

FIG. 4 is a sectional view showing a conventional ventilation fan disclosed in, for example, Japanese Utility Model Application Publication No. 50-150151. This blower is provided inside the main body casing, and is composed of an electric motor 5, a blade casing 6, and blades 7. Reference numeral 8 denotes a lower casing provided to cover the opening and forming a suction port 9; 10 and 11 a high-temperature side temperature sensor formed of a thermistor and provided facing each other across the suction port 9 of the lower casing; and 12 the main body casing. A low-temperature side temperature sensor 13 is provided to protrude from the top surface of the microwave oven 1 and detects the room temperature, and 13 is a range.

The conventional ventilation fan is configured as described above, and when cooking is performed using the range 13, the high temperature side temperature sensors 10 and 11 detect the heat and compare it with the temperature detected by the low temperature side temperature sensor 12. . If the temperature difference based on this comparison exceeds a predetermined value, the blower 4
is automatically operated to suck in combustion exhaust gas etc. from the suction port 9 and discharge it to the outside through the blow-off port 3.

[Problem that the invention attempts to solve]

In the conventional ventilation fan as described above, although not shown in the figure, the switch for switching between forced operation and automatic operation is generally provided on the front of the main body casing 1. In addition, this oil dust, drainage, etc. may enter the live parts of the changeover switch, impairing operability and safety.

This idea was made to solve these problems, and it is safe because it prevents the changeover switch from getting dirty with oil dust, drainage, etc., and prevents oil dust, drainage, etc. from entering the live parts of the changeover switch. The purpose is to obtain a ventilation fan with high performance.

[Means for solving problems]

The ventilation fan according to this invention is a ventilation fan that uses a blower to draw in air from an inlet at the bottom of a main body casing, and sends the air to an outlet provided on one side via a blower chamber that accommodates the blades of the blower. an opening provided on the surface of the main body casing and having an upright part on the circumferential side; an electrical component chamber that communicates with the opening and is sealed from the ventilation chamber and stores electrical components responsible for operating the ventilation fan; and an electrical component chamber that is attached to the opening. an operation part base having a switch operation piece that receives an input operation from the outside; a sheet that covers the side of the switch operation piece that receives the input operation; and a flange part that comes into contact with the raised part of the opening to prevent outside air from entering. At least an external casing is provided that covers the electrical parts chamber so as to be openable and closable, and when the external casing is opened, a changeover switch that is visible from the outside and is responsible for switching between forced operation and automatic operation of the ventilation fan is installed in the electrical parts room. It was established in

[Effect]

In this design, the sheet covers the input operation side of the switch operation piece that receives input operations from the outside, and the flange of the operation unit base comes into contact with the opening of the main body casing, sealing the electrical component room from the ventilation chamber. Because of this, oil dust, drainage, etc. do not enter the electrical parts chamber, and the electrical parts installed in this electrical parts room are not contaminated.

〔Example〕

Figures 1 to 3 are views showing one embodiment of this invention, and in the figures, 13 indicates the same part as the above conventional example, and 20 is a main body casing, with an opening 21 at the bottom.
, an air outlet 22 is provided on the side wall, an inclined portion 23 is provided at the upper part of the front surface, and a ventilation hole 24 is provided in the inclined portion 23 . Reference numeral 25 denotes a front casing forming the front surface of the main casing, and a switch opening 26 into which a switch operating member to be described later is inserted.
is provided with an upright portion 27 formed on its circumferential side, and a screw hole 29 into which a screw 28 is screwed is provided in the lower portion. Reference numeral 30 denotes an air blower installed inside the main body casing 20 via a fitting 31, which consists of an electric motor 32 and a blade 34 attached to the electric motor with a mounting screw 33.
forms the vane casing. 35 is a duct connecting member provided facing the air outlet 22 of the main body casing 1, and a wind pressure shutter 36 is installed therein.
37 is a lower casing as an external casing provided to cover the opening 21 at the lower part of the main body casing 20 and the electrical component chamber 59, and has a recess 38 in the center.
and a screw hole (not shown) for attaching a suction port 39 and a filter to be described later in this recess.
An engagement piece 42 that rotatably engages with an engagement member 41 provided at the lower back of the main casing is provided on the back, and a through hole 43 through which the screw 28 passes is provided on the front. There is. Reference numeral 44 denotes an L-shaped sensor mounting member secured to the lower casing by screws 45 at predetermined intervals, and is provided with a hole 47 into which a bush 46 is fitted. 48 is Butsuyu 4
6, the lead wire 50 is covered with a protective tube 51, and the insertion part is provided with a knot 52 to prevent the temperature sensor from being inserted too far into the bush 46. The wire 50 passes from the rear surface to the upper surface of the main body casing 20 and is connected to a control circuit in a control box, which will be described later, provided at the front. 53 is the lower casing 37
The filter is provided to cover the suction port 39 in the recess 38 of the filter, and is made of punched metal with a plurality of small holes 54, and is suitable for screwing a screw (not shown) into the screw hole. has been done. 56 is a grease filter attached to this filter, 57
is a partition plate that partitions the inside of the main body casing 20 into a ventilation chamber 58 and an electrical component chamber 59;
A bush 60 through which 8 passes is attached. 6
Reference numerals 1 and 62 denote gaskets made of an elastic material, which are provided above and below this partition plate. The gasket 61 is provided between the main body casing 20, the gasket 62 is provided between the lower casing 37, and the air blow chamber 58.
and the electrical component chamber 59, and the electrical component chamber 59 is hermetically sealed from the ventilation chamber 58. 63 is the ventilation hole 24
A low temperature side sensor installed facing the slope part 23
It is attached via a bush 66 to a mounting plate 65 having a mounting surface 64 formed substantially parallel to the .
The lead wire 50 of this low temperature side temperature sensor 63 is covered with a protective tube 51 and is provided with a knot 52 to prevent it from being inserted into the bush 65 too much. 67 and 68 are heat insulating materials provided between this mounting plate and the main body casing 20. The heat insulating material 67 is attached to the mounting plate 64 side and has an insertion hole 69 through which the low temperature side temperature sensor 63 is inserted. The material 68 is attached to the heat insulating material 67 and is formed into a frame shape so as to form a chamber 70 that communicates with the interior of the room. 7
Reference numeral 1 denotes a control box attached to the main body casing 20 via a mounting member 72, and an operation member engagement hole 7 is provided on the front surface.
3 and a lamp hole 74, the side wall is provided with an engaging protrusion 76 for a capacitor 75, and the lower wall is provided with a changeover switch 77 and a circuit board 78 that are visible from the outside when the lower casing 37 is opened. A screw hole 80 for attachment with a screw 79 is provided, and an engagement hole 81 is provided in the collar. Reference numeral 82 designates an operating member as an operating unit base that is attached to the control box 71 and made of synthetic resin, and is connected to the operating member engagement hole 73.
an engagement groove 83 that engages with the lower part of the engagement hole 81, an engagement claw 84 that engages with the engagement hole 81 through elastic deformation, a switch operating piece 85 that faces and is deformable to a switch that will be described later, and a display that will be described later. An insertion hole 86 into which a lamp is inserted, a flange portion 87 that contacts the entire circumference of the upright portion 27, and a recessed portion 89 to which a display sheet 88 displaying a switch notch on the front is attached.
Engagement recess 90 with which a switch board to be described later engages
A screw boss 91 is formed. 92 is a switch board having one end engaged with the engagement recess 90 of the operating member 82 and the other end screwed to the screw boss 91;
A switch 93 is provided, and an indicator lamp 94 made of an LED is provided at the end opposite to the engagement recess 90 so as to be inserted into the insertion hole 86.

In the ventilation fan configured as described above, when cooking is performed using the microwave, the high-temperature side temperature sensors 48 and 49 detect the heat, and compare it with the room temperature detected by the low-temperature side temperature sensor 63. When the temperature difference resulting from this comparison exceeds a predetermined value, the blower 30 is automatically operated by the control circuit of the circuit board 78 provided in the control box 71, and the combustion exhaust gas, oil smoke, etc. from the range are filtered through the filter 53 and the grease filter. 56 into the air blowing chamber 58 from the suction port 39, and discharged from the air outlet 22 to the outside through a duct (not shown) connected to the duct connection member 35. By providing the changeover switch 77 on the lower wall of the control box 71 in this way, attaching the control box 71 inside the main body casing 20 and attaching the lower casing 37 to the main body casing 20 with the screws 28,
Oil dust and drain generated from the range 13 will not adhere to and pollute the changeover switch 77, nor will it intrude into the live parts. Note that this changeover switch 77 is for switching between forced operation and automatic operation,
There is no problem even if the changeover switch 77 is provided inside the main casing 20 because it is not used frequently, and the changeover switch 77 can be seen from the outside once the lower casing 37 is opened, making it easy to perform the changeover operation.

[Effect of idea]

As explained above, this idea covers the input operation side of the switch operation piece that receives external input operations with a sheet, and the opening of the main body casing has a raised part and an operation part base provided around the opening. The flange of the stand comes into contact, sealing the electrical parts room from the ventilation chamber, and when the outer casing is opened, the switch installed in the electrical parts room can be seen, allowing oil dust, condensate, etc. to enter the electrical parts room. The safety of electrical parts can be ensured without having to
The switching operation of the changeover switch can also be easily performed by opening the outer casing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, FIG. 2 is a sectional view of the main part, FIG. 3 is a perspective view of the main part, and FIG. 4 is a sectional view of a conventional ventilation fan. In addition, in the figure, 20 is a main body casing, 30 is a blower, 37 is a lower casing, 71 is a control box, 77
is a changeover switch.

Claims (1)

[Scope of utility model registration request] A ventilation fan that sucks air from a suction port below the main body casing with a blower and sends the air to an air outlet provided on one side via a blower chamber that accommodates the blades of the blower, provided on the surface of the main body casing, an opening having a raised portion on the circumference side; an electrical component chamber that communicates with the opening and is sealed from the ventilation chamber and houses electrical components responsible for operating the ventilation fan; and an electrical component chamber that is attached to the opening and that receives external input operations a switch operation piece that receives the input operation, a sheet that covers the side of the switch operation piece that receives the input operation, and an operation unit base that has a flange portion that comes into contact with the raised portion of the opening to prevent outside air from entering; An external casing is provided to cover the electrical parts room so that it can be opened and closed, and when the external casing is opened, it becomes visible from the outside, and a changeover switch that switches between forced operation and automatic operation of the ventilation fan is provided in the electrical compartment. ventilation fan.