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Title:
Acetylene generator
United States Patent 2436674
Abstract:
This invention relates to acetylene generators. It is the principal object of the invention to provide an acetylene generator in which the feed of the carbide from the hopper is facilitated and made uniform by a highly effective and yet simple mechanism, and in which the discharge outlet from...


Inventors:
Smith, Carl F.
Publication Date:
02/24/1948
Assignee:
SIGHT FEED GENERATOR COMPANY
Primary Class:
International Classes:
C10H15/06
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Description:

This invention relates to acetylene generators.

It is the principal object of the invention to provide an acetylene generator in which the feed of the carbide from the hopper is facilitated and made uniform by a highly effective and yet simple mechanism, and in which the discharge outlet from the hopper is positively controlled and maintained in a sealed condition to prevent accidental access of undesired moisture thereto.

It is also an object to provide such an acetylene generator having mechanism for regulating the supply of carbide in accordance with the pressure of the generated gas, and additional mechanism for agitating or vibrating the feed valve to facilitate the feeding action in which the agitating mechanism is positioned within the hopper and is interposed in the regulating mechanism, such mechanisms being protected from access of the carbide to assure maintaining of proper operating conditions and providing a highly reliable, efficient and compact arrangement.

It is a further object to provide a construction of feed valve and cooperating valve seat which contribute to the maintaining of proper flow conditions during the feeding of the carbide in the form of particles of substantial size as compared with granular carbide, and which in addition provide for the substantially complete sealing of the hopper upon the closing action of the valve, even in the event of the valve closing upon its seat with a particle of carbide therebetween.

It is a still further object to provide such a generator in which a valve seat is provided for cooperation with the carbide feed valve, the valve seat being quite flexible and deformable such that it maintains an effective closed and sealed hopper outlet even when there is carbide present between the valve and its seat, and effectively prevents passage of moisture upwardly into the carbide in the hopper where it might lead to dangerous and explosive conditions.

It is also an object to provide such an acetylene generator in which the vibrating mechanism for vibrating the feed valve provides for complete freedom of movement of the valve while maintaining the same at all times in correct and proper alignment to assure proper seating thereof upon its seat.

Other objects and advantages will be apparent from the following description, the accompanying drawings and the appended claims.

In the drawing: Fig. 1 is a vertical sectional view with certain parts being broken away showing an acetylene generator constructed in accordance with the present invention; Fig. 2 is a vertical sectional view on an enlarged scale showing the construction of the feed valve and its vibrating mechanism; Fig. 3 is a view showing the gas pressure tank with the flash back arrestor and the connection for providing a pulsating pressure for the actuation of the vibrating mechanism; and Fig. 4 is a plan view of the valvw seat for sealing the lower end of the hopper outlet.

Referring to the drawing which discloses a preferred embodiment of the invention, the main tank is shown at 10 having a flanged upper neck portion I I, and containing a quantity of water into which the carbide is dropped to develop the acetylene gas. A discharge outlet pipe 13 leads from the interior of the tank through suitable check valve mechanism indicated generally as 14, and into the lower end of a liquid-trap flash back arrestor 15. This portion of the mechanism may be constructed as desired, reference being made ,to copending Patent No. 2,367,240 for a showing of apparatus suitable for this purpose.

-The carbide receiving hopper is indicated at 20, and comprises a lower plate 21 which is removably bolted to the flange 1 of the tank by means of a series of bolts 22. An upper plate 23 is provided, the plates carrying suitable flexible gaskets 24 against which there is seated the annular wall forming portion 25 which comprises the principal part of the hopper body.

The two end plates are held in tightly clamped relation against the body 25 by means of a series of rods 26, bolted respectively in end plates 21 and 23. In this way the plates are clamped tightly against the body 25 and a pressure and moisture tight hopper construction is thus provided. Preferably the body 25 is formed as a cylinder of transparent glass or like material, suitably reinforced as desired to enable it properly to withstand the pressures to which it is subjected during use. The hopper construction as thus described may be readily unbolted from the tank, to provide for cleaning when desired of both the hopper and the tank, suitable sealing relation being established by means of a gasket 27 carried on the lower face of plate 21, and adapted to be compressed against the flange 11 upon the assembly of the hopper into its operative position as shown. Normal filling of both the hopper and the tank are accomplished by removable filler plugs without requiring disas-' sembly. The generator is adapted for use with carbide in the form of particles of larger size than granular carbide and of the size generally known as 1/4 by 1/12.

Means are provided for regulating the pressure of the gas generated, and for this purpose the upper end plate 23 is formed with a raised rectangular shaped recess 30 which projects materially beyond the wall of the hopper, terminating in an outwardly extending flange 31. The member 33 which may be a flat diaphragm or preferably the expansible bellows as shown, has its open end tightly clamped against the lower face of this projecting member by means of a clamping ring 34 which is secured in place by means of a series of bolts 35, a flexible sealing gasket-36 being provided to maintain a sealed relation.

The closed free end 40 of the bellows engages the upper end of a compression spring 41, the lower end of which rests upon a plate 42, such plate having engagement with a tubular collar 43 which is received inwardly of the spring 41.

The mechanism is enclosed in an outer case 44 which is conveniently secured in place by means of ring 34. To the end wall 45 of case 44 there is positioned a thrust bearing 46. A thrust collar 47 secured to the tubular member 43 is adanted to engage the thrust bearing to transmit axial thrust thereto. The force with which spring 41 is compressed may be varied: by means of the threaded adjusting wheel 48 accessible on the exterior of the casing 44 and providing for effecting axial movement of the sleeve 43 in response to manual adjusting movements. Preferably one side of the disk 42 projects through a slot in the wall of the case 44 as shown at 49, thus forming an index adapted to cooperate with a fixed scale on the wall of the case to indicate the pressure for which the indicator is set.

The diaphragm 33 is open to the pressure of the generated gas through recess 30 and the interior of the hopper, and will expand more or less in response to that pressure and against the pressure established by the compression spring 41. With a certain spring pressure as determined by the setting of screw 48, the diaphragm will remain in a collapsed position until the gas pressure exceeds the pressure exerted by the spring, whereupon the diaphragm will expand, its end plate 40 moving downwardly in the relationship as shown in the drawing.

Manual shutoff means are also provided for positively closing the feed valve when desired, this means including the stem 50 fixed to the lower side of diaphragm 40, having connection through a link 51 with a pull rod 52 which travels axially through the sleeve 43, and at the lower side thereof has pivotal connection as shown at 53 with a hand lever 54 such that in the position shown in Fig. 1 the stem is drawn downwardly and held in locked position with the valve closed.

As will be clear, in response to clockwise rotation of hand 54, the flat face 55 of the lever will engage the lower end of screw 48, thereby allowing rod 52 to move upwardly, and thus providing for the normal regulating action of the mechanism to establish and maintain a desired operating pressure.

In order to transmit the movements of the diaphragm, the stem 60 is secured to the upper face of the diaphragm, and is connected to a link 61 by means of a yieldable connection 62, such connection being adapted to yield in case the normal movement of the feed valve is interrupted, to thus prevent damage to the mechanism.

Link 61 is connected to feed lever 64, the latter being pivotally supported as shown at 65. The end of lever 64 carries a clevis 67 to which there is secured a feed rod 68 that extends downwardly into the interior of the hopper, for the purpose of providing proper actuation for the feed valve.

Not only is the feed valve moved in translation, and in a generally axial direction, as required to control the feed of carbide from the hopper into the tank, but it is also desired to provide a vibrat10, ing motion, such vibrating motion being superimposed upon the regulating movement of the feed valve, facilitating the proper feeding of the carbide and avoiding- any tendency for it to pack around the outlet. This vibrating motion also takes place in an axial direction with respect to the feed valve, andthe mechanism for effecting such vibrating movement is desirably interposed in the connections to the feed valve in such manner that it is carried inwardly of the hopper, and in position to provide for the desired vibratory movement with a minimum of operating mechanism and with substantially reduced weight and with the minimum number of operating parts.

For this purpose the feed rod 68 extends downwardly into the hopper and has its lower end received with a tube 70, being preferably secured thereto by brazing or welding. Tube 70 extends downwardly and to its lower end there is brazed a housing member 72 forming the upper housing for a vibrating or pulsating unit.

Cooperating lower housing member 73 is secured to member 72 by means of a series of bolts 74, and a flexible diaphragm 75 is received between the two members in pressure sealed relation with respect thereto. A spring 76 is enclosed between the upper side of the diaphragm and the housing 72, and provides for normally flexing the diaphragm in one direction, opposite that to which it is moved under the application of the pulsating gas pressure, Such pressure application is effected by means of flexible tube 80 which is connected to fitting 8.1 carried by the upper housing 72, the flexible tube being attached to a nonvibrating metal tube 83, by means of a connector 84. Tube 83 leadsoutwardly of the hopper, and has a slidable and connection 85 over which there is received a tube 87 supported at one side of the opening in the tank. The tube 87 in turn is connected with the discharge outlet conduit 13 through connecting tube 88 which conveniently connects into the check valve fitting, so that it thus constitutes a source of fluctuating pressure when the hopper is in assembled position upon the tank. As will be understood, the gas on discharging through the flash back arrestor bubbles upwardly through the liquid in a series of bubbles, thus resulting in producing continuous, relatively small pressure variations. These pressure variations are transmitted through the connecting. tube system as described above and made effective upon the upper side of the diaphragm 75 where they are sufficient to provide for flexing, of the diaphragm against the action of spring 76. Also as will be understood, when the hopper is removed from the tank, the end 85 of the tube is readily disconnected from the coupling 86, without requiring separate attention, and similarly upon reassembly this connection is also readily reestablished.

Disks 90 are secured above and below diaphragm 75, and a rod 91 is bolted, to the upper disk, this rod extending upwardly on the interior of tube 10. At its upper end the rod has an enlarged head 92 which is only slightly less in diameter than the internal dimensions of tube 70, 2,486;6745 Thus it will be clear that while the entire dia-; phragm or pulsator unit assembly is raised and lowered in response to movements of the pres-. sure regulator, as reflected in axial movements of the feed rod 68, rod 91 has movement within' the tube 70 independently thereof, in response to the pulsating or fluctuating movements of the diaphragm. Thus rod 91 with its head 92 being closely guided within the tube 70, prevents such flexing of the diaphragm as would result in misalignment, the diaphragm thus being constrained to move, fluctuate or vibrate uniformly in the 'direction of the axis of the rod, while being entirely free to move upwardly or downwardly as a unit in response to the regulating adjustments of the mechanism.

A lower feed rod 95 is secured to the lower disk 90 by means of bolts 96, rod 95 passing through a short tube 97 which is held in place by means of nut 98, and around which there is received a wire screen 99 to prevent access of any particles of carbide into the diaphragm or its housing parts. Feed rod 95 is threaded and at its, lower end receives the main feed valve 100. As shown this valve is in the form of a cone shaped element and is secured in predetermined position upon the rod by means of nuts 101. An upper feed valve 103 is also secured upon rod 95, the position thereon being determined by means of lock nuts 104. This upper feed valve is adapted to function to close the hopper outlet in response to abnormal loss of gas pressure, in the event that the regulating mechanism becomes fully collapsed, such as might be the case with a leak having occurred in the main tank. In 35: this way the operation of the generator would be terminated and would prevent the undesired continuing generation of gas under such abnormal condition, The mechanism above described for control- 4 ling the movement of the feed valve is effectively enclosed and protected against contact with. the carbide so that it will function freely and without any interference as a result of such contact. For this purpose a plate I 10 is fixed at the central part of the upper plate 23 and has a tubular dependent portion II I to the lower end of. which there is secured a downwardly extending tube 112. Preferably this tube telescopically re-: ceives a further downwardly extending tube 113, the internal diameter of which is sufficiently large to provide operating clearance for the movements of the feed rod 68 and the tube 70 in the manner, above described, The lower end of tube 113 is received in housing member I 15 which is enlarged sufficiently to enclose the vibrator or pulsator unit assembly leaving clearance around the periphery thereof so that the freedom of movement of the unit is not interfered with. Housing 115 has a cylin- 60 drical wall portion 116 which is guided by and secured to a series of angularly shaped brackets secured to a series of angularly shaped brackets T17 bolted into the lower plate 21 by means of a series of bolts 118. It will be understood that these arms I17 are spaced around the circumference, leaving passages of -adequate size therebetween through which the carbide can feed downwardly from the hopper and thus the downward delivery of the carbide is not interfered with.

The bottom of the hopper is formed by a conical member 120 which may be suitably formed of sheet metal or the like and attached at its upper end to the hopper plate 21. It is apertured to provide for the passage of the tube 83 there-7 through, and a gasket 121 is provided for sealing such passage.

At its lower end the hopper bottom 120 is provided with a laterally turned over flange 124 g to which there is :bolted an outwardly flanged skirt ring 125 by means of a series of bolts 126.

The skirt ring is suitably grooved to provide for receiving a valve seat 128 so that when the skirt is bolted in place on flange 124, this valve seat 10o member will be securely held in position. As shown valve seat 128 is relatively thick in cross section, and is annular in shape, the inner opening having a conical shape and being formed to provide in effect a continuation of the conical surface 120 of the hopper, the lower surface being substantially plane as shown. This provides a lip portion ISO which extends radially inwardly of the adjacent edge of the hopper. The valve seat is formed of a flexible material such as rubber, 20. neoprene, or the like, and is preferably relatively flexible such that it can readily flex under the action of the valve member 100 when it seats thereagainst. A suitable material for this purpose has been found to be a synthetic material 25. identified as No. 6135 neoprene, having a hardness on the Shore durometer of about 45.

Valve 100 is located below the valve seat, and -as . will be clear from Fig. 1, when it is moved upwardly to closed position by the mechanism 30; above described, its conical surface engages the lower flat side of the valve seat, causing a deflection of the lip portion, to thus bring about a sealing engagement over a substantial area of the valve member which is effective to close the discharge outlet and prevent passage of even liquids or gases therethrough. This action is accomplished furthermore even in the event that the valve should close with a particle of carbide caught between the valve member and its seat, the seat having such flexibility and being drawn into sealing engagement over such an area that effective sealing of the outlet is maintained. This is particularly important in generators adapted for use with the larger size particles of carbide, 45: such as the size known as 1/4 by A, experiments having shown that the discharge outlet as described herein remains effectively closed and sealed up to pressures of several pounds per square inch, thus affording protection against 5so access of moisture into the carbide which might result in dangerous -operating conditions. That is, if moisture is allowed to pass into the carbide hopper, a reaction- will occur there where the heat can not be dissipated in a large body of 556 water, and depending upon the pressure and the composition of the gas, the temperature may rise to the danger point where an explosion may occur.

It will be understood that the valve is moved between its open and closed positions under the action, of the regulating mechanism as above described, and that in operation when in open position it is given a vibrating movement in an axial direction which latter movement facilitates ,, the passage of carbide through the discharge opening. :Also it will be clear that the valve is maintained in proper alignment at all times, and cannot be materially displaced relative to the valve seat, such alignment being held through o70 the guiding .action of the head 92 riding upon the interior - of tube 70.

Preferably a tubular tip protector 140 is secured to the lower end of the conical outlet 120 and is secured in place thereon by means of screws 141, 75: this protector-serving the. usual purpose of pre-, venting access of liquid to the area immediately adjacent the discharge outlet.

The invention therefore represents an improved construction of acetylene generator pro* viding for improved control and regulation of the feed valve mechanism with that mechanism being simply and compactly arranged and such as to be readily removable with the hopper for facilitating recharging. The mechanism is easily reassembled for operation, and provides controlled and regulating feeding of the carbide while assuring the positive closing and sealing of the hopper from further discharge and accidental access of moisture when the pressure has reached the desired point.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be- made therein without departing from the scope of the invention which is defined in the appended claims.

What is claimed is: 1. In an acetylene generator, the combination. of a hopper for receiving a quantity of carbide and having a valve seat at its lower end, a feed valve for regulating the flow- ofcarbide from said hopper, regulating means for controlling the operation of said feed valve to regulate the pres-sure of the generated gas, vibrating means including a diaphragm located entirely within said hopper for producing a vibrating action of said feed valve, means for supplying a fluctuating pressure, to said vibrating means for actuation thereof, and guide means carried by said diaphragm and movable therewith for maintaining said valve in proper working relation with respect to said seat.

2. In an acetylene generator, the combination of a hopper for receiving a quantity of carbide, a feed valve for regulating the flow of carbide from said hopper, regulating means located outwardly of said hopper and having a movable part extending thereinto for controlling the operation of said feed valve to regulate the pressure of the generated gas, vibrating means including a diaphragm within said hopper and movable with the regulating movements of said part for producing a vibrating action of said feed valve, means for supplying a fluctuating pressure to said vibrating means for actuation thereof, and means directly connected with said diaphragm and having relatively movable. guiding engagement with said movable part for guiding the movements of said valve.

3. In an acetylene generator, the combination of a hopper for receiving a quantity of carbide and having a valve seat at the lower end thereof, a feed valve for regulating- the flow of carbide from said hopper, regulating means including a movable connection extending into said hopper for controlling the operation of said-feed valve to regulate the pressure of the generated gas, vibrating means including a diaphragm, carried by said movable connection and movable therewith for producing a vibrating action of said feed valve superimposed upon the controlling movements thereof produced by. said regulating means, means for supplying a fluctuating pressure to said vibrating means-throughout said: movements thereof for actuation of said vibrating means, a connection between one side of said diaphragm and said feed valve, and a connection between the other side ofsaid diaphragm and a portion of said movable connection, for guiding the movements of said valve to maintain proper working relation thereof with reference to said seat.

4. In an acetylene generator, the combination & of a hopper for receiving a quantity of carbide, a feed valve for regulating the flow of carbide from said hopper, regulating means including a member movable in said hopper and connected to said feed valve to regulate the position thereof to maintain a predetermined pressure of the generated gas, vibrating means supported by said member and movable therewith, said vibrating means having a diaphragm, means for supporting said feed valve directly from said diaphragm to impart a vibratory action thereto superimposed on the regulating movements thereof, means for supplying a fluctuating pressure to one side of said diaphragm throughout the movement thereof, and guide means supported directly on said 20 diaphragm and movable therewith relative to said member for guiding said valve.

5. In an acetylene generator, the combination of a hopper for receiving a quantity of carbide, a feed valve for regulating the flow of carbide 2$ from said hopper, regulating means including a movable member extending into said hopper, means responsive to the pressure of the generated gas for controlling the-movement of said member, a diaphragm supported by and movable with 30: said member internally of said hopper, means for supplying a fluctuating fluid pressure to said diaphragm to cause vibratory movement thereof- relative to said member, a connection from said diaphragm to said feed valve to produce feed 3S- regulating and vibratory movement of the latter, and another connection from said diaphragm having interfitting engagement with a part of said regulating means for guiding the movements of said feed valve.

6. In an acetylene generator, the combination of a hopper for receiving a quantity of carbide, a feed valve for regulating the flow of carbide from said hopper, regulating means including a movable member extending into said hopper, 45:- means responsive to. the pressure of the generated gas for controlling the movement of said member; a diaphragm supported by and movable with said member, means for supplying a fluctuating fluid pressure to said diaphragm to cause vibra50, tory movement thereof relative to said member, a connection from said diaphragm to said feed valve- to produce feed regulating and vibratory movement of the latter, means also carried by said diaphragm and engageable with said member for guiding-the movements of said feed valve, and means protecting said member and said diaphragm, from contact with the contents of said hopper.

7. In; an, acetylene. generator, the. combination 68 of a, hopper for receiving a quantity of carbide, a. feed valve for regulating the flow of carbide from said hopper, regulating means including a movable member extending into said hopper, means responsive to the pressure of the generated 65: gas for controlling the movement of said member, a diaphragm supported by and movable with said member, means for supplying a fluctuating fluid pressure to said diaphragm to cause vibratory movement thereof relative to said member, a connection from one side of said diaphragm to said feed valve to produce feed regulating and vibratory movement of the latter, means also carried by said diaphragm on the other side. thereof and'engageable with said member in overlapping T, guiding relation therewith in response to vibratory movement of said diaphragm for guiding the movements of said feed valve, and means for enclosing and preventing access of the carbide in said hopper to said member and said diaphragm.

8. In an acetylene generator, a hopper adapted to contain carbide, a feed valve for controlling the discharge of the carbide from said hopper, means responsive to the pressure of the generated gas, a feed rod connected to said responsive means and movable in accordance with the position thereof to regulate the operation of said feed valve, said feed rod extending downwardly into said hopper, a housing supported from said feed rod and movable therewith within said hopper, a flexible diaphragm in said housing, means supporting said feed valve from said diaphragm in position to be movable therewith in accordance with the regulating movements of said feed rod, means for supplying a pulsating fluid pressure to one side of said diaphragm to cause vibrating movement thereof and of said feed valve in addition to said regulating movements thereof, and guide means connected directly to said diaphragm and movable relative to said housing and said feed rod in guiding relation for maintaining proper working alignment of said feed valve.

9. In an acetylene generator, a hopper adapted to contain carbide, a feed valve for controlling the discharge of the carbide from said hopper, means responsive to the pressure of the generated gas, a feed rod connected to said responsive means and movable in .accordance with the position thereof to regulate the operation of said feed valve, said feed rod extending downwardly into said hopper, a housing supported from said feed rod and movable therewith within said hopper, a flexible diaphragm in said housing supported substantially transverse with respect to said feed rod, means supporting said feed valve from said diaphragm in position to be movable therewith in an axial direction in accordance with regulating movements of said feed rod, means for supplying a pulsating fluid pressure to one side of said diaphragm to cause vibrating movement thereof and of said feed valve in addition to said regulating movement thereof, said feed rod being provided with a guiding surface, and a guiding member fixed to the side of said diaphragm opposite that to which said feed valve is connected and having guiding engagement with said guiding surface providing for maintaining said feed valve in proper alignment throughout the range of its movements.

10. In an acetylene generator, a hopper adapted to contain carbide, a feed valve for controlling the discharge of the carbide from said hopper, means responsive to the pressure of the generated gas, .a feed rod connected to said responsive means and movable in accordance with the position thereof to regulate the operation of said feed valve, said feed rod extending downwardly into said hopper, a housing supported from said feed rod and movable therewith within said hopper, a flexible diaphragm in said housing supported substantially transverse with respect to said feed rod, means supporting said feed valve from said diaphragm in position to be movable therewith in an axial direction in accordance with regulating movements of said feed rod, means for supplying a pulsating fluid pressure to one side of said diaphragm to cause vibrating movement thereof and of said feed valve in addition to said regulating movement thereof, said feed rod being provided with a guiding surface, a guiding member fixed to the side of said diaphragm opposite that to which said feed valve is connected and having guiding engagement with said guiding surface providing for maintaining said feed valve in proper alignment throughout the range of its movements, and cover means for completely enclosing said feed rod and said housing providing for free movement thereof and preventing contact of the carbide in said hopper therewith.

CARL F. SMITH.

REFERENCES CITED The following references are of record in the 40 file of this patent: UNITED STATES PATENTS Number 713,640 1,033,863 1,727,981 2,008,821 2,367,240 Name Date Homan -- ----- Nov. 18, 1902 Beck ------------ July 30, 1912 Irwin ------------ Sept. 10, 1929 Fausek et al. -----. July 23, 1935 Smith ----------- Jan. 16, 1945