JPH0431471Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a ventilation hood that is placed above a kitchen range.

[Background Art] Conventionally, in this type of ventilation hood that is placed above a kitchen range, a ventilation fan placed inside the hood is controlled by an operation switch on an operation display section provided on the hood body. Although it is becoming like that,
Since the operation of the ventilation fan was controlled by directly turning on and off the commercial power supply using an operating switch, it was necessary to use a large switch as the operating switch. Conventional operation switches include, for example, a piano switch S _p or a tumbler switch S _t as shown in Fig. 4a, but when such operation switches S _p and S _t are used, the operation The large unevenness of the switch makes it difficult to clean, and oil stains on the surface tend to get into the switch, making the contact mechanism that turns on and off the high-voltage power supply less reliable and more likely to malfunction. It was hot.

[Purpose of the invention] The present invention was made in view of the above points, and its purpose is to make the operation switch part easy to clean, and to increase the reliability of the contact mechanism part to prevent failures. The purpose of the present invention is to provide a ventilation hood that can reduce the occurrence of outbreaks.

[Disclosure of the invention] (Embodiment) Fig. 1 shows an embodiment of the invention, which includes a ventilation fan 1 placed in a hood, a lighting lamp 2 placed in or near the hood,
A ventilation hood comprising a control circuit section 3 that controls a ventilation fan 1 and a lighting lamp 2, and an operation display section 4 that is equipped with an operation switch that sets the operating state of the ventilation fan 1 and an operation indicator lamp that displays the operating state. , a control circuit section 3 is formed by a low-pressure drive type relay that controls the ventilation fan 1 and a relay control circuit that controls the relay, and an operation switch S that sets the operating state of the ventilation fan 1 is connected to a third switch.
As shown in the figure, the push button 10 of the operation switch S is formed by a push button type switch with a small stroke.
In this embodiment, the operating switch S is a small limit switch mounted on a printed circuit board 12. The front part of the switch body 13 provided with the push button 10 in the operation switch S is the front panel 16 of the operation display section 4 provided on the hood.
The opening of the front panel 16 is closed by the sheet holding plate 14 from the front side of the front panel 16. A hole 15 is bored in the center of the sheet holding plate 14, and the push button 10 of the operating switch S projects into the recess on the front side of the sheet holding plate 14 through this hole 15. The periphery of a flexible resin sheet 11 is adhesively fixed to the opening periphery of the recess on the front side of the sheet holding plate 14, and the recess opening is sealed with the resin sheet 11 with the resin sheet 11 spaced apart from the bottom of the recess. be done. This configuration prevents oil stains and the like from entering the switch body 13.

Further, in FIG. 1, the control terminal section 5 is a control terminal section 5 to which external control means such as an external controller 6a for controlling the operation of the ventilation fan 1 from the outside and an additional operation section 6b are connected.

FIG. 2 shows a specific circuit example of the above embodiment, in which the control circuit section 3 steps down the commercial power supply AC from 100V to
24V step-down transformer T _r , diode bridge
DB and 3-terminal regulator VR, diode
A power supply circuit DC consisting of D _O , etc., a launching relay RY _O for turning on and off the power, relays RY 1 and RY ₂ for switching between strong and weak ventilation fan ₁ , and a relay circuit consisting of relay RY ₃ for lighting control. , inverter I ₁ ~
I ₆ , flip-flop FF ₁ , FF ₂ , transistor
Q ₁ to Q ₃ and a relay control circuit consisting of diodes D ₁ to D ₁₇ . In addition, the operation display section 4
The operation consists of push button switches such as an operation switch S ₁ for turning on the power, an operation switch S ₂ for turning off the power, an operation switch S ₃ for changing the strength of the ventilation fan 1, and an operation switch S ₄ for turning the lighting lamp 2 on and off. Light emitting diode L ₁ (red) for indicating strong operation of the switch section and ventilation fan 1, light emitting diode L ₂ (green) for indicating weak operation, and light emitting diode L ₃ for lighting lamp display.
(red), and is connected to the control circuit section 3 via each terminal T ₁ to _{T 13} of the control terminal section 5 . Note that the external controller _6a is
Sensor output, telecontroller output,
Diode D ₁ ′ corresponding to diode D ₁ , D ₂ ,
By connecting the output contacts S ₁ ′ and S ₂ ′ to the terminals T ₂ and T ₃ via D ₂ ′, the power supply can be turned on and off using the control output. Also,
The additional operation section 6b is formed by an operation switch similar to the operation display section 4, and is connected to the control terminal section 5 in parallel.

The operation of the embodiment will be specifically explained below.

Now, when power-on operation switch S ₁ is turned on, a setting current flows through diodes D ₁ and D ₃ and auxiliary contact rob to setting coil L _S of launching relay RY _O , and the relay contacts roa and rob are set. The base bias is applied to the transistors Q ₁ to _{Q 3} through the main contact roa.

In this state, if the non-inverted output of flip-flop FF ₁ is "H", transistor Q ₁
When turned on, relay RY ₁ operates and the normally open side of relay contact r ₁ is turned on, and when transistor Q ₂ turns off, the normally closed side of relay contact r ₂ of relay RY ₂ is turned on. , commercial power AC is supplied to the high-speed drive terminal of the induction motor IM of the ventilation fan 1, and the ventilation fan 1 operates in a strong exhaust mode. On the other hand, when the inverted output of flip-flop FF ₁ is "H", transistor Q ₂ is turned on, relay RY ₂ is operated, the normally open side of relay contact r ₂ is turned on, and transistor Q ₁ is turned on. off and relay ry ₁
Since the normally closed side of relay contact r ₁ is on,
Commercial power AC is supplied to the low-speed drive terminal of the induction motor IM of the ventilation fan 1, and the ventilation fan 1 operates in a weak exhaust mode. In addition, when the non-inverting output of flip-flop FF ₂ is "H", transistor Q ₃ turns on, relay RY ₃ operates, and power is supplied to lighting lamp 2 via the normally open side of relay contact r ₃ . The power supply AC is supplied to turn on the lighting lamp, and when the non-inverting output of flip-flop FF ₂ is "L", transistor Q ₃ is turned off, relay RY ₃ is stopped, and the relay is turned off. The normally open side of contact _r3 is turned off and the illumination lamp 2 is turned off. Here,
Light emitting diodes are connected in parallel to the relays RY ₁ to _{RY 3} above.
Since L ₁ to _{L 3} are connected, ventilation fan 1
The strong/weak operating mode and the blinking state of the illumination lamp 2 are accurately displayed in conjunction with the operation of the relays _RY1 to RY3. By the way, the strength mode of the ventilation fan 1 can be changed using the operation switch _S3 .
By reversing flip-flop FF ₁ every time an on-pulse generated by pressing is obtained, it is possible to sequentially switch from strong to weak to strong to weak, etc., so that the lighting lamp 2 is turned on and off. To switch off, flip-flop FF ₂ is reversed every time the operating switch S ₄ is pressed to obtain an orunpass, and the switch is switched in the order of ON → OFF → ON → OFF, etc. .

Next, when the power off operation switch _S2 is turned on, a reset current flows through the diodes _D2 , _D4 and the auxiliary contact rob to the reset coil _Lr of the launching relay _RYO , and the relay contacts roa and rob are reset. Switched to the side, transistor Q ₁ ~
The base bias of _Q3 is no longer applied. Therefore, transistors Q ₁ to _{Q 3} are both turned off, relay contacts r ₁ to _{r 3} of relays RY ₁ to _{RY 3} are switched to the normally closed side, ventilation fan 1 is stopped, and lighting lamp 2 is turned off. The lights are starting to be turned off.

[Effect of idea]

As mentioned above, the present invention uses a small push-button type switch with a small stroke to form the operation switch for setting the operating state of the ventilation fan placed in the hood, and an operation display section that exposes the front side of the operation switch. The opening in the front panel of the front panel is closed with a seat retaining plate from the front side of the front panel, and the push button of the operation switch is protruded into the recess on the front side of the seat retaining plate through the hole provided in the seat retaining plate. Since the opening of the recess is sealed with the resin sheet by adhesively fixing the periphery of the flexible resin sheet and separating the resin sheet from the bottom of the recess, oil etc. will not adhere to the front panel of the operation display section. Even if the push button is washed away, the sheet retaining plate seals the area around the push button, which prevents oil from adhering to the operation switch and prevents oil stains from entering the inside of the operation switch. As a result, there is an advantage that the reliability of the contact mechanism of the operating switch is improved and the occurrence of failures can be reduced. Moreover, the push button protrudes into the recess of the sheet holding plate, and the flexible resin sheet covering the recess of the sheet holding plate is spaced from the bottom of the recess, so even if the sheet holding plate and resin sheet are present, the push button cannot be pressed. The effect is that it can be operated without any problems. Furthermore, since the operation switch is a small push button switch with a small stroke, the operation switch can be turned on and off simply by lightly pressing the resin sheet with your finger, making it easy to operate.Moreover, the push button is formed on the sheet holding plate. It protrudes into the recess of the sheet holding plate through the hole provided in the sheet holding plate, so even if you try to push the push button more than necessary when pressing the push button with your finger, your finger will hit the sheet holding plate and the push button will not be pressed as much. As a result, the operation switch can be prevented from being damaged due to a large load acting on the push button.

[Brief explanation of the drawing]

Fig. 1 is a block circuit diagram of an embodiment of the present invention, Fig. 2 is a specific circuit diagram of the same, Fig. 3 is a sectional view of the main part of the embodiment, and Fig. 4 ab is a perspective view of the main part of the conventional example. . 1 is a ventilation fan, 3 is a control circuit section, 4 is an operation display section, RY _O to RY ₃ are relays, S, S ₁ to _{S 4} are operation switches, 10 is a push button, 11 is a resin sheet, 13
1 is a switch body, 14 is a seat holding plate, and 15 is a hole.

Claims (1)

[Scope of utility model registration request] The operation switch that sets the operating state of the ventilation fan placed inside the hood is formed by a small push button type switch with a small stroke, and the operation switch is housed in the operation display section provided in the hood. The front part from which the push button of the operation switch protrudes from the opening of the front panel is exposed, the opening of the front panel is closed with a sheet holding plate from the front side of the front panel, and the push button of the operation switch is inserted into the sheet through the hole provided in the seat holding plate. The opening of the recess is sealed with the resin sheet by protruding into the recess on the front side of the holding plate, and adhering and fixing the periphery of a flexible resin sheet to the periphery of the opening of the recess so that the resin sheet is spaced from the bottom of the recess. A ventilation hood consisting of a stopper.