JPH0229410Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for a gas burner for dental treatment.

Traditionally, burners used in dental treatment are
When ignited, many materials continue to burn during treatment hours, but this increases the amount of carbon dioxide in the treatment room, which is not sanitary if the treatment room is airtight and cooled or heated, and also reduces the gas source. This is also undesirable from the point of view of energy conservation as it results in waste. In order to improve this problem, it has been considered to light the burner each time it is used and extinguish it after each use, but this increases the labor of the burner users such as dentists, who often forget to extinguish it, so this is hardly practical. Not served. Furthermore, as shown in Japanese Utility Model Application Publication No. 53-51092, it has been proposed to automatically ignite and extinguish gas using a light-emitting element and a light-receiving element; Since an object is placed between the elements and the light beam of the light emitting element is blocked and the light receiving element does not receive light, combustion occurs only when there is no need for combustion. There was a problem in that malfunctions were likely to occur, such as when some object entered the device and ignited it, or when the light receiving element received light from sources other than the light emitting element and extinguished the fire.

This invention was developed in view of the above-mentioned circumstances, and allows you to select multiple predetermined times, long or short, to burn for the selected time and then automatically extinguish the fire. The purpose of the present invention is to provide a control device for a gas burner for dental treatment that minimizes the increase in energy consumption and is also useful for energy saving.

In order to achieve this object, the control device for a gas burner for dental treatment of the present invention is provided with a plurality of operating members corresponding to the set time length of the gas combustion time in conjunction with a switch, and the operating members: It is characterized in that the part operated by the user is provided to protrude outside the control box.

Hereinafter, one embodiment of the present invention will be described together with a gas burner for dental treatment with reference to the drawings.

In FIGS. 1 to 3, 1 is a control box, and long-time and short-time operation bars 2 and 3 are pivotally attached to the control box 1, and one end of these is attached to the outside of the control box 1. The operation bars 2 and 3 are supported by the control box 1 by springs (not shown).

The photoelectric switches 4 and 5 are provided with a control circuit 8, which will be described later.
is connected to a normally closed solenoid valve 9 that opens in response to a signal from the control circuit 8, and a high voltage generator 10 for ignition that operates for a predetermined short period of time in response to a signal from the control circuit 8.
It is installed in the control box 1 together with the photoelectric switches 4 and 5 and the control circuit 8. The electromagnetic valve 9 is provided inside the control box 1 of the gas supply pipe 11, and is configured such that a gas cylinder 12 is removably connected to a portion of the gas supply pipe 11 that protrudes below the control box 1. A nozzle 13 is connected to a portion of the pipe 11 that protrudes above the control box 1, and a hood 14 is arranged around the nozzle 13 with openings above and on the sides of the operation bars 2 and 3. Below the hood 14 is a saucer 1.
5 is arranged, and a hood 14 and a saucer 15 are each fixed to the gas supply pipe 11 via a seat 16. An ignition electrode 17 connected to the high voltage generator 10 is arranged near the tip of the nozzle 13 inside the hood 14. In FIG. 2, 18 is a power switch, 19 is an air intake port provided in the gas supply pipe 11, and 20 is an IC board of the control circuit 8. still,
Although not shown, if city gas is used, necessary piping will be installed.

As shown in FIG. 4, the control circuit 8 includes flip-flop circuits 21 and 22, an OR circuit 23, an inverting amplifier circuit 24, a flip-flop circuit 25, an inverting amplifier circuit 26, and Resistor 27 and capacitor 28
A timer circuit 29 and manually operated switches 30 and 31 are provided. In addition, in Figure 4, 3
2 is the coil of the solenoid valve 9, 33 is the high voltage generator 10
high voltage generation circuit, 4 and 5 are photoelectric switches, 17
is the ignition electrode.

The operation of the gas burner control device according to the embodiment configured as above will be explained. Press down one end of the operating bar 2 or 3 located near the gas outlet of the nozzle 13 with a therapeutic object, the grip of a tweezers that holds it, or the fingers of a user such as a dentist. The other end of the operation bar 2 or 3 is inserted between the light emitting element 6 and the light receiving element 7 of the photoelectric switch 4 or 5, so that the light receiving element 7 no longer receives the light from the light emitting element 6, and the photoelectric switch 4 or 5 works.

As shown in FIGS. 4 and 5, the photoelectric switch 4
5 operates, one of the outputs _a1 and _a2 is output and input as a trigger to the corresponding one of the flip-flop circuits 21 and 22, which sets one of them and outputs the output _b1 or _b2. The signal is input to the OR circuit 23 and an output c is output. This output c
is input to the inverting amplifier circuit 24, and its output d excites the coil 32, opens the solenoid valve 9, and supplies gas from the gas cylinder 12 to the nozzle 13 via the gas supply pipe 11. Further, the output c of the OR circuit 23 is inputted as a trigger to the flip-flop circuit 25, which becomes a set state, and its output e is inputted to the inverting amplifier circuit 26, and its output f is inputted to the high voltage generation circuit of the high voltage generator 10. 33 and this circuit 3
A high voltage is generated as the output of No. 3, and this high voltage generates a spark discharge in the ignition electrode 17, thereby igniting the gas ejected from the nozzle 13 and putting the burner into a combustion state.

The timer circuit 29 is composed of a free-running multivibrator that oscillates at a predetermined frequency by charging and discharging a resistor 27 and a capacitor 28, a binary counter that divides the frequency of this pulse, and a circuit that outputs its output. has been done. Note that the timer circuit 29 is controlled by the high or low level of the input, and is stopped when the input is high, and is in operation when the input is low. The outputs of the timer circuit 29 are h, i, j, k, and l, where output h has a 3.75 second cycle, output i has a 7.5 second cycle, output j has a 15 second cycle, output k has a 30 second cycle, and l has a 30 second cycle. Pulses are output every 60 seconds.

Therefore, when the output c of the OR circuit 23 is input to the timer circuit 29 and it starts operating, the output h is output at a predetermined period of 3.75 seconds, and this pulse resets the flip-flop circuit 26 which is in the set state. state, and the generation of high voltage by the high voltage generation circuit 33 is stopped.

Furthermore, the output i of the timer circuit 29 is input to the contact 31a of the switch 31, the output j is input to the contact 31b of the switch 31, the output k is input to the contact 30a of the switch 30, and the output l is input to the contact 30a of the switch 30. The output from the switch 31c is input to the flip-flop circuit 22, and the output from the contact 30c of the switch 30 is input to the flip-flop circuit 21. Therefore, as shown in FIG. 5, when the flip-flop circuit 21 is set and the flip-flop circuit 22 is reset by pressing down the long-time operation bar 2 and operating the photoelectric switch 4, an output is output from the contact 31c of the switch 31. is invalid even if it is input to the flip-flop circuit 22, and when the output from the contact 30c of the switch 30 is input to the flip-flop circuit 21, the flip-flop circuit 21 is reset by the pulse, and the output _b1 changes from a low level to a high level. The output of the OR circuit 23, which has changed to a high level, is input to the timer circuit 29, and its operation is also stopped. Conversely, when the short-time operation bar 3 is pressed down to operate the photoelectric switch 5, the flip-flop circuit 22 is set;
This is reset by inputting the output from the contact 31c of the switch 31, and the operation of the timer circuit 29 is stopped. Therefore, when the operation bar 2 is pressed down, the solenoid valve 9 is activated for 30 seconds or 1 minute, and when the operation bar 3 is pressed down, the solenoid valve 9 is activated for only 7.5 seconds or 15 seconds.
After the coil 32 is energized and opened, the coil 32 becomes de-energized and the solenoid valve 9 closes. Therefore, the contacts 30a, 30 connected to the contacts 30c, 31c of the switches 30, 31 in advance
b, 31a, 31b by an appropriate means from outside the control box 1, the user can select and press either of the operation bars 1 or 2 to ignite the burner and change the length of the burner. The burner can be held in the burning state for two different periods of time and then automatically extinguished.

In this example, it is possible to set two types of time, long and short.Specifically, it is possible to set the time for stopping, wax, point cut in dental treatment, wax when making the occlusal ridge of dentures, etc. Time distinction is necessary when working.

In the above embodiment, the switches 30 and 31 were provided so that the combustion time of the burners could be changed respectively, but in the present invention, the switches 30 and 31 may be omitted, and three sets of operation bars and photoelectric switches are provided. Furthermore, it is possible to select three or more combustion times. Further, in the present invention, an operating member such as an operating button may be used in place of the operating bar in the above embodiment, and a limit switch, a proximity switch, a touch switch, etc. may be operated with the operating member in place of the photoelectric switch in the embodiment. You may also do so.

As explained above, the control device for a gas burner for dental treatment according to the present invention can operate the high voltage generator for ignition and the solenoid valve to ignite the burner no matter which of the plurality of operating members is operated. By selecting and operating one of the multiple operating members, you can set the combustion time to the time required for heating work,
Since the fire can be extinguished automatically after the set time has elapsed, it is relatively easy to operate, and there is little wasted combustion time, which helps to save energy and also suppresses the generation of carbon dioxide gas. There are many advantages such as there is less risk of malfunction, and since all parts are mounted or built into the control box, it can be made compact, and even if a photoelectric switch is used as a switch, malfunction will not occur due to external light. You can get the same effect.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration explanatory diagram showing one embodiment of the present invention, Fig. 2 is a side view with a part of the main part cut away, Fig. 3 is an explanatory diagram of the photoelectric switch portion, and Fig. 4 is a control circuit. FIG. 5 is a time chart for explaining the operation. 1... Control box, 2, 3... Operation bar (operating member), 4, 5... Photoelectric switch, 8... Control circuit,
9... Solenoid valve, 10... High voltage generator for ignition, 1
1...Gas supply pipe.

Claims (1)

[Claims for Utility Model Registration] (1) A switch operated by an operating member, a high voltage generator for ignition, a solenoid valve for opening and closing a gas supply pipe, and the high voltage generator connected to the switch. In a control device for a gas burner for dental treatment, which includes a control circuit in a control box that opens the electromagnetic valve for a predetermined period of time corresponding to the operated operating member, A control device for a gas burner for dental treatment, characterized in that an operating member is provided in conjunction with the switch, and a portion of the operating member that is operated by a user protrudes outside the control box. (2) The control device for a gas burner for dental treatment according to claim 1, wherein the operating members are two touch bars.