Abstract:
A multifunctional safety gas flow regulator controller, mainly composed of an electronic circuit, automatically starts an alarm and controls components that close the gas supply when the flame is accidentally extinguished or when the battery has an inadequate power supply. The controller is characterized by its multifunctional safety controller for proper disposal of gas tools.

Description:
SUMMARY OF THE INVENTION 
     The present invention relates to a multifunctional safety controller for application in a gas oven, gas heater and gas Bar B.Q. grill, mainly composed of an electronic circuit which automatically starts an alarm and closes the gas supply by means of an electromagnetic valve when the flame is accidentally extinguished, or starts a pre-alarm for replacement of battery when its power supply will be inadequate soon before use or during use in order to prevent an accident from occurring when there is no power supply to close the gas supply, or to close the power supply for the main flame when the induction electrode is accidentally grounded. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a view showing a circuit in accordance with the present invention. 
     FIG. 2 is a sectional view of a gas cooker utilized in accordance with the present invention. 
     FIG. 3 is a first schematic view illustrating the working of the gas cooker shown in FIG. 2. 
     FIG. 4 is a second schematic view illustrating the working of the gas cooker shown in FIG. 2. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIGS. 1 to 4, it can be seen that when switch 14 of electronic circuit 80 is ON, on the one hand, C5 is discharged, and solenoid 52 of always-closed, electromagnetic valve 50 is magnetically excited to cause the flowing out of gas through the nozzle 54 of the mother flame. On the other hand, bias is produced by R28, Q1 is conducted, bias is produced by R27, Q19 is conducted, which cause the formation of a vibrational loop by Q3, Q4, L1, C2 and Q5, R6. An electrical voltage is formed at the 4th plug of L1 which is rectified by D1 and then transferred to C4 and L2 to form a charging circuit. When the electrical voltage has reached a certain value, bilateral diode A will be grounded to make C4 discharge and a large current is produced by L2 to form a high electrical voltage at L2. As a result, electronic ignition is made by ignition electrode 71 to burn the gas flowing out from mother nozzle 54 to become the mother flame. During the ignition process, electromagnetic valve 62 has no electric current passing through and is always kept open to make differential membrane 30 close the gas supply for the main flame. When the mother flame is formed, induction electrode 72 induces a current to maintain magnetic excitement of solenoid 52 after C5 is discharged. This current flows from R1 to pole B of Q2. As a result, Q2 is conducted, Q1 is short circuited, and Q19 has no bias. Q3 and Q4 are opened because of no IB, D1 gives no electrical voltage for charging, L3 gives no more high electrical voltage and 71 stops ignition. At this time, electromagnetic solenoid 62 is charged to make electromagnetic valve 60 close the gas supply for the mother flame. Then, the gas supply for the main flame flows out and accepts the ignition of the mother flame to become the main flame. Referring back to FIG. 1, Q10, Q12, R9, R10, C5 form an automatic charging loop. When switch 14 is OFF, negative voltage is transferred from R10 to pole B of Q11 and positive voltage is conducted from pole E of Q11 to pole C to charge C5. When switch 14 is ON, negative voltage is grounded and flows from R9 to pole B of Q10 which connects E and C of Q10 and causes a short circuit of IB of Q11. As a result, Q11 cannot be conducted and charged. At this time, Q12, Q13 are conducted through discharge from C5 and R11. Positive voltage from pole C of Q13 flows to Q8 and conducts through Q9 to cause magnetic excitement of solenoid 52 of electromagnetic valve 50 and open valve 51 which control gas supply for the mother flame (as shown in FIG. 3). If all electricity charged in C5 is totally discharged, and the mother flame has not been ignited, then induction electrode 72 has no induction current, Q12, Q13 cannot be conducted because of no bias, Q8 is short circuited, solenoid 52 of electromagnetic valve 50 is cut off, valve 51 returns to position which close the gas supply to achieve the objective of automatically closing the gas supply for the mother flame. At this time, Q14 is conducted, positive voltage passes from pole C of Q14, D3 to Q15, and Q15, Q16 and L4 form a vibrational loop which makes horn SP at the edge of output transformer sound to inform us to turn off the switch axle 10 for gas supply so as the switch 14 is OFF. The horn stops sounding and then accidental factors are eliminated follow by operation of ignition again. Q6, Q7 are used to control Q8 and IB of Q14. If the signal of ignition of the mother flame is detected by induction electrode 71, Q19 is in open circuit manner, 71 stops ignition, Q3, Q4 and L1 cannot produce vibration, positive electromagnetic force of pole C of Q4 disappears, first plug of L1 is grounded, negative voltage is conducted through 3rd plug to R6 which makes Q6, Q7 connect, positive voltage is given by pole C of Q7 to make IB of Q14 short circuit and Q15, Q16 in open circuit manner. In this case, the gas cooker is in a normal operation mode and the horn SP will not give an alarm. If electrical voltage of battery 90 is higher than the forward voltage of diode D4, D5 (the lower limit of that forward voltage is used as the lower limit for the working voltage of electromagnetic valve), D5 is conducted to produce bias for Q17 (there is electrical voltage at X), which makes Q17 function, R22 short circuit, Q18 not function and its backward circuit (including horn, Q15, Q16, D5) not function. In other words, at this condition, the electrical voltage of battery is normal and requires no replacement. However, when electrical voltage of battery 90 is lower than the forward voltage of diode D4, D5 (i.e., a low electrical voltage which makes electromagnetic valve unable to function), D5 is not conducted, no electrical voltage is present at X, no bias at Q17, Q18 functions and sends positive electricity to Q15 to produce vibration in the vibrational circuit formed by Q15, Q16, R17, R18, R19, C8 and L4. The horn is forced to sound to inform us that the electrical voltage of battery is too low to use and should be replaced. When switch 14 is OFF, the horn will stop sounding. If induction electrode 72 is accidentally grounded, then during the process of ignition, since 72 is grounded, D7 is conducted, R2 is short circuited, the circuit behind Q1 to R27 still functions which makes electromagnetic solenoid 52, 62 not function. As a result, gas supply for main flame does not flow out to maintain safety. Once the factor of grounding is eliminated, normal operation is retained. 
     The mechanical operations of an accustomed gas cooker for the electonic circuit of the present invention are shown in FIG. 2 to 4 and explained as follows. Basically, the gas cooker includes a gas switch axle 10, a main gas controlling valve 20 which can be opened by a guide rod 11 installed on the gas switch axle 10; a differential membrane 30 having a first gas chamber 31 and a second gas chamber 32; a main flame gas controlling valve 40 which can be opened by means of the relationship of pressure difference of differential membrane 30; an always-closed electromagnetic valve 50 and an always-opened electromagnetic valve 60 installed in the second gas chamber of membrane 30; a high voltage electronic ignition circuit 80, an ignition electrode 71 and induction electrode 72 and a working power source 90, etc. When rotational axle 10 pushes guide rod 11 upward, as shown in FIG. 3, movable arm 13 attached on guide rod 11 contacts with operational arm 15 of switch 14, and power supply 90 is sent to high voltage electronic ignition system 80 and electromagnetic solenoid 52 of always-closed electromagnetic valve 50 to cause magnetic excitement and open the valve gate 51 of electromagnetic valve 50. As a result of the upward movement of guide rod 11, valve gate 22 of main controlling valve 20 is opened, and gas will flow from inlet pipe 23 through valve gate 22 to side pipe 24 and further to the valve chamber of main flame gas controlling valve 40 and pass through holes 41, 42 to the first gas chamber 31 of differential membrane 30. In addition, high voltage ignition starts. However, electromagnetic solenoid 62 of always-opened electromagnetic valve 60 has not magnetically excited yet which permits mother flame 512 to flow from conduit 65, valve gate 61 of always-opened electromagnetic valve 60, interior of box 56, valve door 51 of always-closed electromagnetic valve 50, conduit 509, 53 to mother nozzle 54, then ignition by ignition electrode 71 to light up mother flame as shown in Fig. 3. At this time, since the first gas chamber 31 and the second gas chamber 32 at the two sides of differential membrane 30 are both filled with gas, it is located at the equilibrium position, i.e. both membrane 33 and the main flame gas controlling valve 40 remain at their original position as shown in the figures. As a result, gas entering the interior of pipe 23 cannot enter the main flame gas pipe 25. 
     When mother flame is ignited, inductive electromotive force produced by induction electrode 72 will stop the operation of high voltage ignition, electromagnetic solenoid 62 of always-opened electromagnetic valve 60 is magnetically excited to close its valve gate 61 and close the gas supply for the mother flame. Residual gas remained in the second gas chamber is burned slowly by the mother nozzle. Since the second gas chamber and the box have an adequate space to occupy residual gas for continual burning of mother flame for a certain period after the ignition of main flame is achieved. At this time, since the valve gate 61 of always-opened electromagnetic valve 60 is closed, there is no circulation of gas in the second gas chamber 32 of differential membrane 30 and excess gas is completely burned by the mother nozzle. As a result, the second gas chamber loses its pressure and a pressure difference is set up between the first gas chamber and the second gas chamber since gas circulation is continued and filled rapidly the first gas chamber. Since the gas pressure is exerted on a large area of membrane 33, the effect of pressure difference is able to overcome elastic force of compression spring 44 for normal manner locking of the valve gate 43 of main flame gas controlling valve 40 and produce a displacement toward the second gas chamber of differential membrane 33 and main flame gas controlling valve 40 together. Valve gate 43 is opened to make gas inside gas pipe 23 flow through valve gate 43 to main flame gas pipe 25. Then, from the main flame gas pipe 25, the gas is directly conducted to the main nozzle (not shown in figures) and ignited by mother flame to complete the safety ignition of the main flame. 
     The present invention has an advantage that its circuit structure is simple and can be used with any general gas tools to assure the safety of users.