JP3850474B2 - Equipment with operation switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device with an operation switch, and more particularly to a device with an operation switch incorporated in a hand switch provided in a shower head of a water heater or a water heater, a remote controller such as a fan heater.
[0002]
[Prior art]
FIG. 5 is a diagram showing a schematic configuration of a conventional water heater.
Referring to the figure, a water pipe 39 to which water is supplied and a gas pipe 41 to which gas is supplied are connected to a water heater body 37, and water is controlled by a control circuit including a CPU 33 installed therein. Supply and combustion of a burner (not shown) are controlled, and hot water is supplied through a heat exchanger heated by the burner.
[0003]
A flexible hot water discharge pipe 15 is swingably attached to the lower part of the water heater body 37, and the shower head 11 is connected to the tip. An operation button 17 is attached to the body 13 of the shower head 11, and a signal output from the operation button 17 is input to the CPU 33 via a signal line 35.
FIG. 6 is a diagram showing a circuit configuration of the operation button 17 shown in FIG.
[0004]
Referring to the figure, between the power supply voltage Vcc and the ground potential, a switch 18 to close the contact by the pressing of the operation button 17 and the resistor R ₃ are connected in series. The potential of the node N ₃ between the switch 18 and the resistor R ₃ is input to the port P of the CPU 33 via the signal line 35.
Next, the operation by pressing the switch 18 will be described. When the operation button 17 is pressed and the contact of the switch 18 changes from “open” to “closed”, the power supply voltage Vcc and the ground potential are electrically connected, and the potential of the node N ₃ changes from “L” to “H”. To change. The CPU 33 determines the change in the potential of the node N ₃ via the signal line 35, and controls the supply of water and the combustion of gas, assuming that the operation button 17 is turned on.
[0005]
FIG. 7 is a schematic configuration diagram of a remote controller 43 used in a conventional fan heater, for example.
Referring to the figure, a first operation button 45 and a second operation button 47 are installed in parallel on the top of the remote controller 43.
FIG. 8 is a diagram showing a circuit configuration of the first operation button 45 and the second operation button 47 of FIG.
[0006]
Referring to the figure, between the power supply voltage Vcc and the ground potential, the switch 46 whose contact changes from “open” to “closed” by pressing the first operation button 45, and the second operation button 47 A switch 48 whose contact changes from “open” to “closed” by pressing and a resistor R ₄ are connected in series. The potential of the node N ₅ between the switch 48 and the resistor R ₄ is input to the port P of the CPU 34 through the signal line 36.
[0007]
Next, the operation of the switch 46 and the switch 48 will be described. When the first operation button 45 and the second operation button 47 are pressed simultaneously, the contact state of the switch 46 and the switch 48 changes from “open” to “closed”, and the power supply voltage Vcc and the ground potential are electrically connected. Connected. Therefore, the potential of the node N ₅ changes from “L” to “H”, and the change in the potential of the node N ₅ is determined by the CPU 34 via the signal line 36 and control such as the start of operation is performed. That is, the remote controller shown in FIGS. 7 and 8 is provided with two switches, and the potential of the node N ₅ changes only when the two switches are pressed simultaneously. That is, by configuring the operation switch in this way, it is possible to prevent malfunction due to a case where only one switch is pressed by mistake.
[0008]
[Problems to be solved by the invention]
In the structure of the operation button having only one switch as shown in FIG. 6, there is a possibility that the operation switch is easily determined to be ON by an erroneous operation. Further, when the operation button 17 is incorporated in the body portion 13 of the shower head 11 shown in FIG. 5, there is a risk that the contact of the switch is determined to be ON due to the influence of water or dust even if there is no erroneous operation. There is. For example, in the state where the body 13 is submerged under the water surface 53 of the washing bowl 51 as shown in FIG. 9, even if the switch 49 is a waterproof type micro switch, water droplets are inside the switch. There is a possibility of intrusion. In this case, it is determined that the contact point is ON due to the infiltrated water, and an undesired control may be started.
[0009]
On the other hand, as shown in FIG. 7 and FIG. 8, two switches are provided, and even when the operation switch is determined to be ON only when these switches are pressed simultaneously, If it is always in the ON state due to the influence of water or dust, the meaning of providing two switches is lost .
[0010]
An object of this invention is to provide the apparatus with an operation switch which can prevent a malfunctioning also in the state where the trunk | drum of the shower head was submerged.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a device with an operation switch including a first switch and a second switch, and changes a contact state of the first switch. A first detection means for detecting; a second detection means for detecting a change in a contact state of the second switch; a first detection output by the first detection means; and a second detection means by the second detection means. Determination means for determining that the operation has been performed when the two detection outputs are generated in a predetermined order, and the first switch and the second switch are a shower of a water heater or a water heater. The second switch is incorporated in the head and is provided on the downstream side of the shower from the first switch.
[0016]
【The invention's effect】
As described above, according to the first aspect of the present invention, the second switch incorporated in the shower head of the water heater or the water heater is provided on the downstream side of the shower head from the first switch. Therefore, when the hand switch is submerged, the second detection output is generated first, so that no malfunction occurs.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a sectional structural view of a shower head according to a first embodiment of the present invention.
Referring to the figure, the shower head 11 is composed of a cylindrical trunk portion 13 whose one end (lower side) is opened, and a movable (push-in) operation button 17 incorporated in the center of the trunk portion 13. Is done. A first switch 19 in which a convex first actuator 20 is formed on the upstream side (upper side in a normal posture) of the body portion 13 with a _first interval L ₁ from the back of the operation button 17. Is placed. The first switch 19 is attached to the fixed member via an elastic body 21 such as a spring member. A signal generated by the contact between the operation button 17 and the first actuator 20 is transmitted via a signal line 23 to a CPU (not shown) incorporated in the water heater body.
[0021]
On the other hand, a convex second actuator 22 is formed on the downstream side (lower side in the normal posture) of the body portion 13 with the second distance L ₂ from the other surface of the back surface of the operation button 17. A second switch 25 is arranged. The second switch 25 is attached to a fixed member via an elastic body 27 such as a spring member, and a signal generated by contact between the back surface of the operation button 17 and the second actuator 22 is transmitted via a signal line 29. Sent to the CPU.
[0022]
FIG. 2 is a diagram illustrating a circuit configuration of an operation switch including the operation button 17, the first switch 19, and the second switch 25 in FIG. 1.
Referring to the figure, connected to the first switch 19 changes to "closed" from the state of the contact "open" by the pressing of the operation button 17 and the resistor R ₁ is in series between the power supply voltage Vcc and the ground potential Is done. The potential of the node N ₁ between the _first switch 19 and the resistor R ₁ is input to the port P ₁ of the CPU 33 via the signal line 23.
[0023]
On the other hand, the potential of the node N ₂ between the _second switch 25 and the resistor R ₂ whose contact state changes from “open” to “closed” by pressing the operation button 17 between the power supply potential Vcc and the ground potential. Is input to the port P ₂ of the CPU 33 via the signal line 29.
Next, the operation of the operation switch will be described with reference to FIGS. When the operation button 17 is pressed, since the first interval L ₁ is smaller than the second interval L ₂ , the back surface of the operation button 17 first comes into contact with the first actuator 20 of the first switch 19. When the operation button 17 is further pressed from this state, the first switch 19 moves backward as viewed from the operation button 17 in a state where the back surface of the operation button 17 and the first actuator 20 are in contact with each other by the action of the elastic body 21. The other surface of the back surface of the operation button 17 is in contact with the second actuator 22 of the second switch 25.
[0024]
That is, by pressing the operation button 17, first, a signal indicating that the contact state is “open” to “closed” is transmitted from the first switch 19 via the signal line 23. A signal whose contact state is “open” to “closed” is transmitted via the signal line 29. In this way, the CPU 33 can detect that the operation button 17 has been operated correctly by determining the input order of signals from the first switch 19 and the second switch 25, and can perform various controls. .
[0025]
FIG. 3 is a flowchart showing a control routine of switch determination processing by the CPU 33 of FIG.
When the switch determination processing routine is entered, it is determined in step S1 whether or not the first switch 19 has been turned ON. When the first switch 19 is not ON, it is determined that the operation switch has not been operated, and this determination processing routine ends. On the other hand, if the first switch 19 is ON, it is determined in step S2 whether or not the second switch 25 is ON. If it is determined that the second switch 25 is ON, it is determined in step S3 that the operation switch is ON, and the switch determination processing routine ends.
[0026]
Thus, when the CPU 33 performs the switch determination process, it is possible to prevent malfunction when the body portion 13 is submerged in, for example, a washing bowl. That is, when the trunk portion 13 of the shower head 11 is submerged, water enters from the downstream side 31 side. In this case, even if the first switch 19 and the second switch 25 are turned on due to the ingress of water, the second switch 25 comes first and the first switch 19 is in the order of generation of the signals to be turned on. Will be later. Therefore, the generation of the ON signal of the first switch 19 and the second switch 25 due to the intrusion of water can be distinguished from the generation of the ON signal generated when the operation button 17 is correctly operated. This makes it possible to determine the operation of a simple operation switch.
[0027]
FIG. 4 shows a control routine for switch determination processing by the CPU according to the second embodiment of the present invention.
When the switch determination processing routine is entered, it is determined in step S1 whether or not the first switch 19 has been turned ON. When the first switch 19 is not turned on, the determination processing routine ends. On the other hand, if the first switch 19 is ON, it is determined whether or not 5 seconds have elapsed after the first switch 19 is turned ON in step S2. In step S4, it is determined whether or not the second switch 25 is turned on until 5 seconds have elapsed after the first switch 19 is turned on. If the second switch 25 is turned on within 5 seconds after the first switch 19 is turned on (YES in step S4), it is determined that the operation switch is turned on in step S5, and the switch determination process is performed. The routine ends.
[0028]
On the other hand, if the second switch 25 is not turned on within 5 seconds after the first switch 19 is turned on (YES in step S2), the flow proceeds to step S3, and the operation switch is turned off. The flow ends.
By performing the switch determination process in this manner, for example, even when the first switch 19 has a failure in which the contact state is always “closed”, it is possible to prevent malfunction due to the operation switch. That is, in such a case, when the switch determination processing routine is entered, there are many states in which 5 seconds or more have elapsed after the first switch 19 is turned on, so the flow basically proceeds from S2 to S3, and the CPU 33 This is because it is determined that the operation switch is OFF. Therefore, even if the operation button 17 is pressed in such a state, the control with the operation switch turned ON is not started, and the switch failure of the first switch 19 can be found.
[0029]
In each of the above-described embodiments, the application is applied to the contact a in which the operation switch is determined to be ON when the contact state changes from “open” to “closed”. The concept of the present invention can be similarly applied to the b-contact in which the operation switch is determined to be ON when it is changed to “open”.
In the above embodiment, the present invention is applied to the operation switch of the shower head 11, but the present invention may be applied to an operation switch incorporated in a remote controller such as a fan heater.
[0030]
Furthermore, in the above embodiment, the present invention is applied to the shower head of a water heater, but it goes without saying that the present invention can be applied to a shower head of a water heater as well.
[Brief description of the drawings]
FIG. 1 is a diagram showing a cross-sectional structure of a shower head according to a first embodiment of the invention.
FIG. 2 is a diagram showing a circuit configuration including the operation switch of FIG. 1;
FIG. 3 is a flowchart showing control of a switch determination processing routine by a CPU 33 of FIG.
FIG. 4 is a flowchart showing control of a CPU switch determination processing routine according to a second embodiment of the present invention.
FIG. 5 is a diagram showing a schematic configuration of a conventional water heater.
6 is a diagram showing a circuit configuration of an operation switch of the shower head 11 in FIG. 5. FIG.
FIG. 7 is a diagram showing the external shape of a remote controller used for a conventional fan heater or the like.
8 is a diagram showing a circuit configuration including the operation switch of FIG. 7;
FIG. 9 is a diagram for illustrating problems with the operation switch shown in FIG. 5;
[Explanation of symbols]
11 Shower head 17 Operation button 19 1st switch 20 1st actuator 22 2nd actuator 25 2nd switch 33 CPU
45 1st operation button 47 2nd operation button In addition, the same code | symbol in each figure shows the same or equivalent part.

Claims (1)

A device with an operation switch composed of a first switch and a second switch,
First detection means for detecting a change in the contact state of the first switch;
Second detection means for detecting a change in the contact state of the second switch;
Determination means for determining that an operation has been performed when a first detection output by the first detection means and a second detection output by the second detection means are generated in a predetermined order; ,
The first switch and the second switch are incorporated in a shower head of a water heater or a water heater, and the second switch is provided downstream of the shower head with respect to the first switch. Equipment with switch.

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