Abstract:
A proportional pressure adjusting valve with two main valves and two diaphragms, of which the two diaphragms of different sizes are lapped one over the other to act on each other and to control a second main valve, the smaller diaphragm and the second main valve connected with it are used to sense the change of pressure at a gas outlet to automatically adjust the size of a gas inlet; the amount of gas received by an aeration chamber of the larger diaphragm controls the force of a spring being compressed between the larger and the smaller diaphragms, so that a flow able to proportionally and automatically adjust can be obtained to firstly kindle up a mother fire, then to make kindling of a main fire, thereby to delay shutting of the mother fire.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention is related to a proportional pressure adjusting valve with two main valves and two diaphragms used in supplying technique of combustion gas provided by a gas combusting appliance, wherein a first main valve has a function to firstly kindle up a mother fire, then to make kindling of a main fire, thereby to delay shutting of the mother fire; while a second main valve has a function to sensing the change of pressure of the combustion gas and to stabilize the pressure at the outlet, as well as to proportionally control the flow of the outlet of the combustion gas taking advantage of the mutual action between a larger and a smaller diaphragm; the structure can be used on any proportional adjusting valve having two diaphragms with different kinds and pressures of combustion gas.  
         [0003]     2. Description of the Prior Art  
         [0004]     Normally, combustion gas is controlled at the standard of safety required; it needs two main valves at an outlet to guarantee that: in case one of the main valves leaks because of being abnormal of the outlet, the second main valve can form separation to prevent this. However, provision of the two main valves generally is substituted by mechanical water valves, or a first main valve directly driven in an electromagnetic way is applied in stead; the former costs more, and the water leaking problem is continuously created by water pressure, the latter needs larger electric power to result an electricity exhaustion phenomenon; if these two modes coexist, when they are activated, a mother fire is kindled up to make kindling of a main fire, the mother fire will keep on combusting, this results unnecessary combusting exhaustion; and lapping of the mother fire with the main fire creates a phenomenon of incomplete combustion.  
         [0005]     Moreover, the second main valve generally is used for preventing leakage, if this main valve can be used to proportionally control flow to stabilize the pressure of the valve in addition to being used for preventing leakage, its function can be multiplied. However, valves for adjusting flow in the market presently are primarily for adjusting sizes of bores; by using such an adjusting mode, when intake pressure is changed, a shortage is created accordingly in that outlet pressure becomes unstable, and when the flow adjusting is performed by bore adjusting, if the kind of combustion gas is changed, another shortage is created in that the entire valve must be changed.  
       SUMMARY OF THE INVENTION  
       [0006]     In view of the above stated, the proportional pressure adjusting valve with two main valves and two diaphragm of the present invention is developed after elaborate study against the above conventional valves to have two main valves to prevent leakage probably induced in the case that the only one main valve provided leaks; and the first one of the main valves is provided with a delay mother-fire valve able to delay extinguishing of the mother fire for reducing waste of combustion gas.  
         [0007]     The adjusting valve mainly is comprised of a first main valve having a single diaphragm and a second main valve having two diaphragms. Wherein the diaphragm of the first main valve forms a first main valve plug in a normal pressure chamber, the first main valve plug seals the first main valve by means of a main spring provided in a back pressure chamber of the diaphragm; and the first main valve has a two-way micro electromagnetic valve to control whether gas enters the back pressure chamber with a normally opened hole, the two-way micro electromagnetic valve has a normally closed hole to connect a mother fire combustor and a delay mother-fire valve outlet provided at the side of the outlet of the first main valve to be press held by the first main valve plug, an intake hole of the delay mother-fire valve is communicated with the side of the outlet of the first main valve, a top rod is used to press hold the first main valve. When the first main valve is closed, the delay mother-fire valve is opened; on the contrary, when the first main valve is opened to a predetermined extent, it closes the delay mother-fire valve.  
         [0008]     The second main valve is designed to be a proportional pressure adjusting valve having two diaphragms, it has a second main valve plug that seals the outlet communicating with a main combustor, a valve stem is provided to connect the second main valve plug with a smaller diaphragm, a pressure adjusting chamber is formed between the second main valve plug and the smaller diaphragm, at one side of the smaller diaphragm there is an atmosphere pressure chamber provided therein with a pressure adjusting spring of which one end holds the smaller diaphragm; the other end of the pressure adjusting spring can be pulled to stretch and press held by a larger diaphragm, the larger diaphragm is in turn pushed away by a larger spring. One end of the larger spring is fixedly provided on a housing at one side of the atmosphere pressure chamber; by separation of the larger diaphragm, an aeration chamber is formed, the gas intake side of the aeration chamber receives gas of which the amount is controlled by a normally closed micro electromagnetic valve, the gas discharge side of the aeration chamber discharges gas of which the amount is controlled by a normally opened micro electromagnetic valve; thereby, when the normally closed micro electromagnetic valve is turned on to open and combustion gas enters the aeration chamber, the larger diaphragm will be compressed, in turn the larger diaphragm will compress the larger spring, meantime, the pressure adjusting spring will be changed from its stretching state (namely, the state of closing the second main valve plug) to the state of compressing of the pressure adjusting spring, thereby the second main valve plug is opened; at this time, if the pressure of the combustion gas changes, it will automatically drive the smaller diaphragm to provide an adjusting action to close or open the second main valve plug to an extent, thereby a function of stabilizing the pressure and flow of supplying of the combustion gas is obtained.  
         [0009]     And more, the larger diaphragm can be further provided thereon with a permanent magnet, and with a distance-adjustable induced magnetism detector at a position in opposition to that of the permanent magnet in order to timely make control whether a normally opened micro electromagnetic valve at the discharging side is to activate or turn off.  
         [0010]     Thereby, to provide a valve structure able to sense change of combustion gas to stabilize the outlet pressure of the combustion gas and to proportionally control the outlet flow of the valve, the same valve structure can be applied to proportional pressure adjusting valve structures (each with two diaphragms) using different combustion gas and having multiplication effects.  
         [0011]     The present invention will be apparent in its structure as well as its mode of operation after reading the detailed description of the preferred embodiment thereof in reference to the accompanying drawings. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0012]      FIG. 1  is a sectional view showing the structure of the present invention;  
         [0013]      FIG. 2  is a sectional schematic view showing the state of operation of a two-way micro electromagnetic valve of the present invention;  
         [0014]      FIG. 3  is a sectional schematic view showing the state of operation of a normally closed micro electromagnetic valve of the present invention;  
         [0015]      FIG. 4 a  sectional schematic view showing the state of operation of a normally opened micro electromagnetic valve of the present invention;  
         [0016]      FIG. 5  is a sectional schematic view showing the state of completely opening operation of a second main valve plug of the present invention;  
         [0017]      FIG. 6  an enlarged sectional schematic view showing a permanent magnet and a distance-adjustable induced magnetism detector of the present invention;  
         [0018]      FIG. 7  is a sectional view showing another embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0019]     The proportional pressure adjusting valve with two main valves and two diaphragms of the present invention is structurally comprised basically of, as shown in  FIG. 1 , a first main valve having a single diaphragm at a main gas inlet  1  of combustion gas, and a second main valve having two diaphragms at the front section of an outlet  3  of combustion gas.  
         [0020]     The diaphragm of the first main valve forms a first main valve plug  113  in a normal pressure chamber  111 , the first main valve plug  113  normally seals the first main valve by means of a main spring  114  provided in a back pressure chamber  112  of the diaphragm; and the first main valve has a two-way micro electromagnetic valve  118  to control whether gas enters the back pressure chamber  112  with a normally opened hole  115 , the two-way micro electromagnetic valve  118  has a normally closed hole  116  to connect a mother fire combustor  4  and a delay mother-fire valve outlet  121  provided at the side of the outlet  2  of the first main valve to be press held by the first main valve plug  113 , the delay mother-fire valve outlet  121  is controlled by a delay mother-fire valve  122  press held by the first main valve plug  113 , an intake hole of the delay mother-fire valve  122  is communicated with the side of the outlet  2  of the first main valve, a top rod  123  is used to press hold the first main valve  113 . When the first main valve plug  113  is closed, the delay mother-fire valve  122  is normally opened; on the contrary, when the first main valve is opened to a predetermined extent, it closes the delay mother-fire valve  122 .  
         [0021]     The second main valve has a second main valve plug  211  that seals the outlet  3  communicating with a main combustor, a valve stem is provided to connect the second main valve plug  211  with a smaller diaphragm  212 , a pressure adjusting chamber  21  is formed between the second main valve plug  211  and the smaller diaphragm  212 , at one side of the smaller diaphragm  212  there is an atmosphere pressure chamber provided therein with a pressure adjusting spring  213  of which one end holds the smaller diaphragm  212 ; the pressure adjusting spring  213  is provided between a smaller diaphragm seat  241  and a larger diaphragm seat  242 , in order that its one end can be stretched and press held by a larger diaphragm  215 ; the larger diaphragm  215  is in turn pushed away by a larger spring  214 . One end of the larger spring  214  is fixedly provided on a housing at one side of the atmosphere pressure chamber; by separation of the larger diaphragm  215 , an aeration chamber  22  is formed, the gas intake side of the aeration chamber  22  receives gas of which the amount is controlled by a normally closed micro electromagnetic valve  219 , the gas discharge side of the aeration chamber  22  discharges gas of which the amount is controlled by a normally opened micro electromagnetic valve  220 ; thereby, when the normally closed micro electromagnetic valve  219  is turned on to open and combustion gas enters the aeration chamber  22 , the larger diaphragm  215  will be compressed, in turn the larger diaphragm  215  will compress the larger spring  214 , meantime, the pressure adjusting spring  213  will be changed from its stretching state (namely, the state of closing the second main valve plug  211 ) to the state of compressing of the pressure adjusting spring  213 , thereby the second main valve plug  211  is opened; at this time, if the pressure of the combustion gas changes, it will automatically drive the smaller diaphragm  212  to provide an adjusting action to close or open the second main valve plug  211  to an extent, thereby a function of stabilizing the pressure and flow of supplying of the combustion gas is obtained.  
         [0022]     Thereby, to provide a valve structure able to sense change of combustion gas to stabilize the outlet pressure of the combustion gas and to proportionally control the outlet flow of the valve, the same valve structure can be applied to proportional pressure adjusting valve structures (each with two diaphragms) using different combustion gas and having multiplication effects.  
         [0023]     As shown in  FIG. 2 , when a combusting appliance receives a starting signal, the two-way micro electromagnetic valve  118  of it receives a voltage to close the normally opened hole  115 , meantime to open the normally opened hole  116 , at this time, the combustion gas flowing to the back pressure chamber  112  from the normal pressure chamber  111  is blocked, thereby the combustion gas in the back pressure chamber  112  leaks out toward a connecting passageway  117  and the mother fire combustor  4  by opening of the normally opened hole  116 ; now the first main valve plug  113  is opened by pressure reducing of the back pressure chamber  112 , thus the combustion gas flows to the second main valve through the side of the outlet  2  of the first main valve, and by virtue that the delay mother-fire valve  122  is still open, the combustion gas further flows to the connecting passageway  117  through the delay mother-fire valve outlet  121 , and enters the back pressure chamber  112  through the normally opened hole  116 , in order that the diaphragm and the first main valve plug  113  tend to seal the valve; however, the mother fire combustor  4  still consumes combustion gas, hence the first main valve plug  113  is in a slightly opening state, so that the mother fire combustor  4  keeps being supplied with combustion gas for the mother fire in a nonstop state (the combustion gas for the mother fire is not stopped until the second main valve plug  211  is opened). Meantime, although the combustion gas is also supplied for the normally closed micro electromagnetic valve  219  of the second main valve; but by virtue that the normally closed micro electromagnetic valve  219  has not yet been turned on to open, thus the combustion gas is blocked here, a main combustor  5  is still not in operation.  
         [0024]     As shown in  FIG. 3 , when the normally closed micro electromagnetic valve  219  gets a voltage to open, combustion gas enters the aeration chamber  22  of the larger diaphragm  215 , and then flows to the normally opened micro electromagnetic valve  220  at the gas discharge side to leak out to the outlet  3  of combustion gas for supplying the combustion gas required for operation of the main combustor  5 . If the combustion gas entering the aeration chamber  22  of the larger diaphragm  215  is more than that leaking out to the normally opened micro electromagnetic valve  220 , the pressure that the aeration chamber  22  obtains moves the larger diaphragm  215  leftwards to compress the larger spring  214 , thus the smaller diaphragm  212  opens the second main valve plug  211  to a predetermined extent; if the normally closed micro electromagnetic valve  219  is opened and then closed, and the normally opened micro electromagnetic valve  220  keeps its close state, the second main valve plug  211  can stop at any predetermined position to maintain a constant flow to the side of the outlet of the combustion gas.  
         [0025]     Moreover, if intake pressure is changed, the smaller diaphragm  212  will sense this change of pressure, and the pressure adjusting spring  213  reacts to automatically adjust the size of the outlet of the second main valve plug  211 ; that is, when the pressure is changed, as is shown in  FIG. 4 , the second main valve plug  211  will automatically be closed to an extent (because the smaller diaphragm  212  will be extruded to the right); on the contrary, when the pressure becomes smaller, the second main valve plug  211  will automatically be opened to an extent (because the smaller diaphragm  212  will be moved to the right by the action of the spring force), thereby an effect of stabilizing the flow of the outlet can be obtained.  
         [0026]     If it is desired to render the combustion gas appliance to get the maximum supplying flow of the combustion gas, such as is shown in  FIG. 5 , the normally closed micro electromagnetic valve  219  is opened all the way, and the normally opened micro electromagnetic valve  220  is closed all the way, the aeration chamber  22  now gets the maximum pressure, the larger diaphragm  215  thus is moved to the most left end to render the pressure adjusting spring  213  to be compressed to the endmost, and the second main valve plug  211  is opened to the maximum extent to get the maximum fire.  
         [0027]     Please simultaneously refer to  FIGS. 1 and 6 , the present invention further is provided on the larger diaphragm seat  242  of the larger diaphragm  215  with a permanent magnet  216 , and a distance-adjustable induced magnetism detector  217  is provided at a position in opposition to that of the permanent magnet  216 , the distance-adjustable induced magnetism detector  217  can be composed of a Howard IC, its position of allocation is controlled by an adjusting screw  218 , so that the state of displacement of the larger diaphragm  215  can be sensed by the distance-adjustable induced magnetism detector  217 , in order to timely decide whether control of turning on/off of the normally opened micro electromagnetic valve  220  at the gas discharge side shall be executed. In the aforesaid embodiment, the present invention makes the valve itself allow the outlet  3  of the main combustor  5  for entering of combustion gas to be allocated at a side in opposition to a valve stem  221  relative to the second main valve plug  211 ; certainly, when in practicing, it can also be as shown in  FIG. 7 , to allow the outlet  3  of the main combustor  5  for entering of combustion gas to be allocated at a side same as that of the valve stem  221  relative to the second main valve plug  211 , and the above stated function of stabilizing the pressure and flow of supplying of the combustion gas can be obtained by both these cases.  
         [0028]     In conclusion, the present invention provides a preferred practicable structure of a proportional pressure adjusting valve with two main valves and two diaphragms for a gas combusting appliance; while the preferred embodiment shown and described is only for illustrating the present invention, and not for giving any limitation to the scope of the present invention; it will be apparent to those skilled in this art that various modifications or changes without departing from the spirit of this invention shall also fall within the scope of the appended claims.