Abstract:
A gas regulator with several stage adjustments comprises a main body, two regulating bases and two pressure regulators provided in two--one upper and the other lower--chambers in the main body for regulating the pressure in both chambers, two regulator caps to close up a top and a bottom side of the main body, a restoring unit for releasing a stopper in a micro adjusting unit from an opening of a first passageway to restore ordinary gas supply in case of automatic stoppage of the opening by extremely large gas flow caused by leakage, and a micro adjusting unit having the stopper to be adjusted in its position to change sensibility of stopping gas supply in case of disorder.

Description:
BACKGROUND OF THE INVENTION 
     At present, common automatic gas flow controllers have a principal function of stopping a gas passageway by means of a stopper pushed up by pressure difference at both ends of the stopper caused by gas leakage or disorder of a pressure regulator. In practical use, gas coming from an inlet tubeof high pressure or an outlet tube has no gas because of long intermittent use; excessive gas volume may flow into instantly and a gas tank is opened again, forcing the stopper rise up to block the passage as a temporary gas stoppage. On the contrary, when gas inflow is of low pressure, the gas in the tank becomes low, and gas outflow also decreases, causing unbalanced gas supply. 
     SUMMARY OF THE INVENTION 
     A gas regulator with several stage adjustments has been devised in the present invention, intended to have features as follows for improving disadvantages of conventional gas regulators. 
     1. Gas pressure is always kept at a stably balanced condition. 
     2. Inner pressure of an upper and a lower chamber in the regulator body can be adjusted according to various stoves. 
     3. It can automatically stop gas supply in case of gas leakage. 
     4. Sensibility of a micro adjusting unit can be adjusted to acquire real safe control of gas flow. 
     5. The micro adjusting unit has a protective cap to prevent a connected rod from being touched by a careless person, to safeguard the sensibility of the micro adjusting unit. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     FIG. 1 is an exploded perspective view of a gas regulator with several stage adjustments in the present invention. 
     FIG. 2 is a cross-sectional view of a pressure regulator in condition of stopping gas in the gas regulator with several stage adjustments in the present invention. 
     FIG. 3 is a cross-sectional view of the pressure regulator in condition of letting gas flow in the gas regulator with several stage adjustments in the present invention. 
     FIG. 4 is a cross-sectional view of two adjusting blocks in condition of being handled in the gas regulator with several stage adjustments in the present invention. 
     FIG. 5 is a cross-sectional view of a connected rod in a micro adjustor pushed to stop a passageway in the gas regulator with several stage adjustments in the present invention. 
     FIG. 6 is a cross-sectional view of a restoring unit in condition of operation in the gas regulator with several stage adjustments in the present invention. 
     FIG. 7 is a cross-sectional view of the micro adjusting unit in condition of operation in the gas regulator with several stage adjustments in the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     A gas regulator with several stage adjustments in the present invention, as shown in FIG. 1, comprises a main body 1, an inlet tube 10 attached to the left of the main body 1 and connected with a rotatable disc 100, an outlet tube 11 attached to the right of the main body 1, a first passageway 13 in a right portion communicating with the outlet tube 11, and a nut hole 14 and a second passageway 15 communicating with the first passageway 13. The second passageway 15 communicates with the first passageway 13. The second passageway 15 has a lower notch 150 communicating with the cavity of the main body 1 and a connecting tube 16 of two different sizes 160, 161 extending rearward communicating with the first passageway 13 and an annular groove 17 is provided around its outer surface. A separating plate 18 is set between the first regulating base 12 and the first passageway 13, separating the cavity into an upper chamber 19 and a lower chamber 19&#39;, in which a second regulating base 12&#39; is opposite to the first regulating base 12. The two regulating bases 12, 12&#39; have corresponding threaded holes 120, 120&#39;, pin holes 121, 121&#39; behind the threaded holes 120, 120&#39;, and through holes 122, 122&#39; behind the pin holes 121, 121&#39;. The through hole 122 in the first regulating base 12 communicates only with the inlet tube 10, but the through hole 122&#39; does with the upper and the lower chamber 19, 19&#39;. 
     Two pressure regulators 2, 3 are respectively combined with the first and the second regulating bases 12, 12&#39; in the upper and the lower chambers 19, 19&#39;, having two regulating plates 20, 30, two regulating diaphragms 21, 31 and two springs 22, 32 combined together. The regulating plates 20, 30 are shaped to slope from the rear to the front in a pointed cone fashion, having recesses 200, 300 in its bottom for fillers 201, 301 to fit therein, and pins 202, 302 extending sidewise. The regulating diaphragms 21, 31 have carrying members 210, 310 and pulling members 211, 311 connected with regulating plates 20, 30 fixed tightly on an upper surface and a lower surface. The pulling members 211, 311 have connecting openings 212, 312 in its ends, and the carrying members 210, 310 have spring grooves 213, 313 for springs 22, 32 to lodge therein. 
     Two caps 4, 5 are provided to cover and be screwed on and under the main body 1, respectively having cylindrical cap posts 40, 50, threaded adjusting blocks 41, 51 and turnable caps 42, 52 combined with the cap posts 40, 50. The adjusting blocks 41, 51 respectively have projections 410, 510 for springs 22, 32 to fit around. 
     A restoring unit 6 is provided to combine with a rear portion of the main body 1, having a push cap 60 extending out the main body 1, a push rod 61 connected with the push cap 60 and extending in the connecting tube 16 and the first passageway 13 in the main body 1. The push rod 61 has a push head 610 at one end and an anti-leak ring 611 attached to the head 610, possible to block up a small diameter portion 161 of the connecting tube 16 to prevent gas leakage, and a thread at the other end and is fitted around by a spring 62. A female thread 600 is provided in the push cap 60 fitting in the annular groove 17 in the main body 1 to screw with the push rod 61. 
     A micro adjusting unit 7 is provided in the front portion of the main body 1, having connecting rod 70, a sustaining rod 71, a nut 72, a rotatable button 73, and a protective cap 74. The nut 72 has a central threaded hole 720, a male thread 721 in a lower portion, and the connecting rod 70 extends in the second passageway 15 in the main body 1, having a stopper 700 at a bottom and an anti-leak ring 701 beside the stopper 700 to block up tightly the opening of the first passageway 13. The sustaining rod 71 abuts on the connecting rod 70, having a male thread portion 710, a stopper 711 in an intermediate portion, passing through the threaded hole 720 in the nut 72 and extending in the second passageway 15 in the main body 1. The rotatable button 73 screws with the end of the sustaining rod 71 and is contained in the protective cap 74. 
     In normal operation of this gas regulator, gas in a gas tank flows in the inlet tube 10 and through the hole 122 of the first regulating base 12, filling in the upper chamber 19, actuating the first pressure regulator 2 to work, letting the regulating plate 20 extend outward to inflate the regulating diaphragm 21 compressing the spring 22. When the regulating plate 20 extends to a horizontal condition, the stopper 201 blocks the hole 122 as shown in FIG. 2, keeping the pressure in the upper chamber 19 definite. If the gas in the upper chamber 19 flows in the lower chamber 19&#39; through the hole 122&#39; in the second regulating base 12&#39;, the compressed spring 22 resiliently and quickly presses the diaphragm 21, causing the regulating plate 20 to shrink back, and then the stopper 21 blocks the hole 122 no more as shown in FIG. 3, permitting gas to flow in. The gas flowing in the lower chamber 19&#39; from the upper chamber 19 is kept in a stabilized condition, controlled by the second pressure regulator 3. Then gas can be balanced in flowing into and out, not causing unbalanced supply or instant stoppage of gas. In addition, the inner pressure of the upper and the lower chamber can be adjusted according to difference of stoves, by handling the adjusting blocks 41, 51 of the regulator caps 4, 5 in changing their position in the cap posts 40, 50, letting the projections 410, 510 push the springs 22, 32 in various degrees of tightness as shown in FIG. 4. 
     In case a stove connected with outlet tube 11 should become out of order to cause gas leakage, flowing speed of the gas in the leakage side or the outlet tube 11 would be much greater than the entering side or the inlet tube 10 permitting the pressure in the lower chamber 19&#39; become greater than that at the leakage or the outlet tube 1, and thus breaking the original balanced pressure, to resultant pressure difference. However, the pressure difference and flowing speed can overcome the weight of the connecting rod 70, which is then to be pushed up to block the opening of the first passageway 13 as shown in FIG. 5. Consequently, supply of gas can be automatically cut off, preventing gas from flowing out continuously and thus obtaining security and safety in using the stove with this gas regulator. 
     After a disorder in the gas stove or the tubes is repaired the push cap 60 in the restoring unit 6 is to be pressed down, pushing down the push rod 61 to let the push head 610 move the connecting rod 70 down. Then the stopper 700 leaves off the opening of the first passageway 13. Now, the push cap 60 can be released, permitting the push rod 61 pushed down to leave off the first passageway 13 by the compressed spring 62 recovering its elasticity, making the gas flow as usual as shown in FIG. 6. 
     The micro adjusting unit 7 is provided to adjust sensibility of the stopper 700 to acquire the best possible safety to cut off gas supply in case of gas leakage, by rotating the rotatable button 73 to elevate or lower the sustaining rod 71 so as to push up or down the stopper 700 and thus to adjust the distance between the stopper 700 and the opening of the first passageway 15. FIG. 7 shows the condition of the micro adjusting unit 7 adjusted in the best sensibility. And the protective cap 74 can prevent the rotatable button 73 from being pushed carelessly.