US1871043A - Oil burner regulating and relief device - Google Patents

Description

Aug 9, 1932- c. H. CHALMERS L87L43 OIL BURNER REGULATING AND RELIEF DEVICE Filed May 12, 1930 2. Sheets-Sheet l' Aug. 9, 1932.

c. H. cHALMERs L87L043 OIL BURNER REGULATING AND RELIEF DEVICE Filed May l2, 1950 2 Sheets-Sheet 2 Patented Aug. 9, 1932 UNITED STATES OIL BURNER REGULATING AN D RELIEF DEVICE Application mea may 12, 193e. serial ivo. 451,587.

This invention relates to pressure fluid f feeding systems, such as are employed in oil burners and especially to pressure regulating and relief devices for use in such systems.

In high pressure oil burning systemsfmeans such as a pump is used for feeding the `fuel to the feed regulating valve under relatively high pressure, and it is essential to prevent the flow of fuel to the discharge nozzle until the pressure is built up to a point where the oil will atomize and be readily ignited when discharged. It is also desirable to have the feed regulating valve positively prevent dripping of the oil the moment the burner and pump are shut ed..

To secure adequate pressure of such oil burner systems, and to allow for variance in the delivery of the pump orA other circulating device, the system and pump are so conau structed ythat the pump will deliver a greater amount of oil to the regulating valve than may actually be discharged by the nozzle. Various means have been provided for returning the surplus oil to the fuel tank after nor- 23 mal operating pressure has been built up in the system. Regulating and relief valves of the diaphragm type' have been extensively used for this purpose, but such diaphragm valves have been objectionable because they are expensive to manufacture, delicate in structure, unsightly and clumsy and because acid, present in the fuel, often eats the diaphragm. To my knowledge, there have been a few feed regulating valves on the market of the spring pressed plunger type, but prior to my invention these have not been associated with a relief valve. The plungers in such valves are slidable in a barrel or cylinder and it is usually impossible to prevent leakage-of oil between the barrel and plunger to the rear end of the plunger. This leakage causes a back pressure to bebuilt up on the spring side of the plunger which often renders the valve i5 inoperative.

It is an object of my present inventionto 'provide in fluid feeding systems of the high pressure type, such as oil burning systems, a simple, compact and comparatively inexpenslve pressure regulating and relief device, which will v`overcome the objections previously referred to, common to oil burners commercially sold at this time, which willfunction perfectly regardless of substantial variations in the pressure of the fuel, which will positively prevent leakage and dripping, and which will cooperate nicely with standard equipment used in oil burner systems at this time.

lt is a further object to provide a device of the class described, wherein two valves of the spring-pressed plunger type are disposed side by side in parallel'barrels, one controlling the initial feeding of fuel at a predetermined pressure to the discharge nozzle and the other4 controlling the actual working pressure and' the return of exc'ess fuel delivered by the pump, or other circulating device, and wherein provision is made for preventing the accumulation and back pressure of oil at the rear ends of .the two saidplunger valves by eiiciently draining and returning any` oil from the rear vends of the plungers to the return line communicatingwith the fuel tank.

Another object is to provide a device of the class described wherein the said plunger valves are counter-bored' to receive the actuating springs, thereby mak'ing it possible to greatly reduce the lengths of the barrel, lighten the plungers, and make a much more compact and ornamental device.

lt isfurther an object to provide a device of the class described, which will obviate the objectionable chattering or rapid reciproeating of the valve proper, which is common in -most valves used for this work at the pres- 1 ent time, and to also contstruct said device in the formJ of a unit having a rugged intake stem so constructed that connections with the throughout the several views and wherein;

Fig. 1 is a diagrammatical view showing an embodiment of my invention operatively connected in an oil burner system;

Fig. 2 is avertical section taken longitudid nally through my relief and feed regulating J device; and

Fig. 3 is a cross section taken on the line 3-3 of Fig. 2, showing the port connecting the rear ends of the` two valve barrels, and a suitable means for effecting the oscillation or seating lof the valve plungers.

In the embodiment of the invention illustrated, my relief andfeed regulating device, Idesignated as an entirety by the letter A, is

connected at its intake end with the .feed

pipe F of a high pressure oil burning system, while therelief discharge is connected by the return pipe R with the fuel tank T. The feed line F, from tank T passes through a suitable strainer S, and apump Ppr other device for setting up a circulation of fuel under pressure is interposed in the feed line, preferably between the strainer and the intake of the feed regulating and relief device.

The intake 4 of my device, preferably, comprises an elongated stem of considerable thickness and strength having the axial, vertical intake port 4a which communicates at bits upper end with a common horizontal pas- '45 sage or port 5 connecting with the lower ends of two vertically disposed cylindrical barrels 6 and 7, respectively. It will be noted that the barrels (i by side in juxtaposition with their axes parallel. I `find it convenient to form both barrels o'fsimilar bore and length and as shown,

they have open upper ends which may be closed in a mannerhereinafter described.

Below barrel 6 is a feed discharge passage '55 comprising an axial port 8 having a-valve seat 8a, said port communicating at its lower end with a somewhat larger laterally extending port- 9a which is formed in the nozzle attachment portion or stem `9 of my device., As

605 shown, the discharge nozzle 10 with the nozl zlehead N at the outer end thereof is threadnedl secured to the stem 9.

n axi'al ort 11 communicates with the lower end o therelief valve barrel 7 said port communicating at its lower end with a and 7 are disposed side laterally extending return port 12a formed in a horizontal return stem 12. A tapered 'valve seat 11a is disposed in the upper end of port 11. The"fuel return pipe R is suitably connected with stem 12.

In the construction of my device, the intake stem 4 nozzle-attachment stem 9, return stem 12 and the valve barrels 6 and 7 are preferably cast or integrally formed for purposes later to bel explained.

An initial pressure and feed regulating plunger 13 is slidably disposed in barrel 6, said plunger, as shown, having a dminished lower end terminating in)a pointed conical valve 13a, which accurately ts the valve seat 8a.A The upper or rear end of plunger 13 is deeply counter-bored to receive the greater portion of an actuating spring 14, for urging said valve to closed position. Suitable means may be provided to facilltate rotary oscillation of the valve 13a in its seat which may, if desired, consist in a pair of diametric slots13b formed Vin the upper annular end of plunger 13. The upper end of coiled spring 14 reacts against an adjustable abutment plug l'which may be inserted from the upper and open end of the barrel 6, and which has threaded engagement kwith the interior of said barrel to facilitate'regulation thereof. Plug 15 may have a boss provided with a slot 15a for receiving a screw driver to facilitate adjustment and removal thereof. The open upper end of barrel 6 is tightly closed by means of a suitable flanged cap 17, screw-threaded to the interior and upper end of the barrel 6 and provided with a packing washer 18.

Within relief barrel 7, a plunger 19 is slidably disposed for regulating the working feed pressure and for also relieving excess fluid pumped, said plunger having a counter-bored outer or rear end in which a spring 2O is nested, similar to the nesting of spring 14 in the plunger 13. Spring 20 reacts against an abutment plug 21 at upperv end, adjustably threaded in the interior and upper end of barrel 7, and a removable cap 22 closes the open upper end of barrel 7' and is provided with a packing washer 22a.

The lower end of plunger 19 has an exfitting seat 11a, and an axial drain port 24 extends through stud 19a extending'from the lower extremity of saidstud, and communieating with the counter-bored upper end of the plunger. A very small leakage groove or port 19o may be formed in the exterior surface of valve 19?).

Aternally threaded diminished stud 19a which The upper ends lof the two barrels t3 and 7 are interconnected by means of a horizontal port 25 so that any fluid accumulating in barrel 6 due to leakage between the plunger 13 and said barrel m'ay pass to the rear or outer end of plunger 19 which is provided with the axial drain port 24.

Apertures 26 and 27 may be formed through the cap 17 and the portion of the casting or member A which is disposed hetween barrels 6 and 7 for the purpose of accommodating a sealing wire to prevent tampering or adjustment of the initial feed valve after it has been set.I

j Opera-tion ,i

ln operation, the tension of the actuating springs 14 and 2O areso adjusted by properly positioning their plugs 15 and 21, that the initial feed valve 13 will be held closed until the pressure upon the lower end thereof exceeds a desired point, for example, sixty pounds per square inch. The actuating spring 20 of the controlling and relief plunger 19 is so adjusted that said plunger will remain closed until the pressure against the lower end exceeds the desired working point,

say for example, ninety pounds per square inch. When the pump is operated, pressure will be built up in the system and applied against the lower ends of plungers 13 and 19,

Aand when this pressure is adequate to thoroughly atomize the discharged uid, valve 13a will be raised and the fluid will be sprayed from the nozzle. Uponl further operation, pressure will be increased to the point where the working pressure controlplunger 19 will be vraised permitting the surplus oil to be returned through port 11, port 12a and return pipe R, to the fuel tank. After the initial feed controlling valve .13 is adjusted for a predetermined point, a sealing wire crband is preferably inserted through the apertures 26 and 27, as it is not usually desirable for the user to adjust this valve.

In the operation of a sliding plunger pressure regulating device, small amounts of oil are bound to leak between the plungers and the barrels. In my device, the accumulating leakage in barrel 6 will pass through the interconnecting port 25 into the upper end of barrel 7 and will be drained through the axial passage 24 in plunger 19 and returned to the return pipe R. It will be seen, therefore, that it is impossible for pressure to be built. up at the rear or outer ends of either of the plungers to eHect the efficiency or operation of mydevice. The interconnection of the upper ends of the barrels in cooperation with the axial drain port in the plunger 19 provides a simple means for draining the lealage without requiring any drilling or tap-v ping of the casting A and both barrels will be eficiently drained.

No leakage of oil can occur at the upper ends of barrels 6 and 7, due to the fact that the caps 17 and 22 with their associated packing washers form a Huid tight joint at said ends.

It will be noticed that my entire pressure regulating and relief device is perfectly balanced upon the intake stem 4 and is entirely mounted within the integral casting A. The elongated intake stem 4 is ruggedly constructed and may be passed through an opening in casing or casting C, as shown in Fig. 1, and secured to a boss B therein Aby suitable means, such as a set screw. The said depending stem 4, thus will support the entire device as well as the connected ends of the feed and return pipes and also the nozzle pipe 10.

The tension of springs 14 and 20, and consequently, the actuating pressure upon plungers 13 and 19, respectively, may be readily varied by removing caps 17 and 22, inserting a screw driver, or other tool, and turning the plugs 15 and 21, respectively. lt will also be seen that the plugs 15 and 21, and the springs 14 and 20, may be removed from the open upper end of the barrels 6 and 7 whereafter, a tool having an end, similar to a large screw driver, may be inserted. in the slotted portions of the upper ends'of plungand relatively light unitary structure. The

small leakage groove 25 in the surface of relief valve 196 permits a small amount of oil'tobe returned before the pressure is adequate to open relief valve 19?). Y

From the foregoing description it will be seen that I have provided a simple, compact and highly efficient pressure regulating and relief device. especially adapted for pressure oil burning systems and capable of. wide gen.- eral usage in pressure fluid feeding systems of many types.

It will, of course. be understood that various changes may bel made in the form, details, arrangement and proportions of the parts Without departing from the scope of my invention, which, generally sta-ted, consists in a ldevice capable of carrying out the obj ects above set forth, in the novel parts and combinations of parts disclosed and defined in the appended claims. r

What is claimed is:

1. A pressure regulating and relief device, comprising a barrel having a yieldingly actuated plunger valve slidably disposed therein, a fluid intake communicating withthe inner end of said barrel to subject said plunger'to the pressure of incoming fluid, a discharge which said plunger valve cooperates, and an axial drain passage through sa1d plunger valve communicating with said discharge passage.

2. A pressure regulating ahd relief device.

for fluid feeding systems having in combination, a pair of barrels, a pair of plunger valves slidably mounted in said barrels and yieldingly urged inwardly, an intake passage communicating with the inner ends of both of said barrels to subject said plungers to the pressure of incoming fluid, a feed discharge having a valve seat therein with which one of said valves cooperates, a relief discharge having a valve seat therein with which said other valve cooperates, and connections between the outer ends-of said barrels and the relief discharge adapted to drain off fluid which leaks into the outer portions of 'said barrels between said barrels and said plungers to prevent accumulation of back pressure against said plungers.

' ends of said barrels 4being interconnected, and

a drain passage communicating with the outer portion of one of said barrels behind its plunger to drain ofi' fluid leaking between said plunger and said barrel.

4. A pressure regulating and relief device for fluid feeding systems having in combination, a pair of plunger containing barrels disposed side by side, plunger valves slidably mounted in said barrels, a fluid intake communicating with the inne-r ends of said barrels to subject said plungers to the pressure of incoming fluid, a feed discharge passage having a valve seat therein, with which one of said valves cooperates, and a relief discharge passage with which said other valve cooperates to control the working pressure, the outer ends of said barrels being interconnected, said second valve having an axial drain port therethrough communicating with the said relief discharge passage.

5. A pressure regulating and relief device for fluid feeding systems comprising a member having an intake passage therein connected with a fluid supply conduit, a'feed discharge passage and a relief discharge passage connected with a fluid returnconduit, a

pressure controlling and relief valve within apertured member to support the entire device and said connections with the supply and return conduits.

6. A pressure regulating and relief device for fluid feeding systems comprising a memi' ber having an intake passage therein connected with a fluid supply conduit, a reliefdis-f charge passage connected with a fluid return conduit, aplunger valve slidably mounted in said member for controlling the How of seeping between the peripheral wall of said l y plunger and said first mentioned member.

7. A pressure regulating and relief device for fluid feeding systems comprising a plunger-containing barrel having a fluid intake communicating with one end thereof, and also having a relief dischargepassage communiveating with the same end, a valve seat in said relief discharge passage disposed axially of said barrel a plunger slidably mounted in said barrel and urged in the direction of said seat, said plunger carrying a reduced valve element adapted to cooperate with said seat and having an axial drain port communicating with said relief discharge passage for draining fluid seeping between the peripheral wall of said plunger and said barrel.

8. A pressure regulating and relief device for fluid systems comprising a plunger-containing barrel having a fluid intake communicating with one end thereof and also having a relief discharge passage communicating with the same end and disposed substantially axially 0f said barrel, a Valve seat in said re- -Y ment, a coiled spring interposed between said abutment and the outer end of said plunger and a fluid-tight closure for the outer end of said barrel for rendering said abutment and plunger accessible for adjustment and replacement and for positively preventing leakage of fluids from said barrel.

9. A pressure regulating and relief device for fluid feeding systems comprising an integral member having formed therein a pair of plunger-containing barrels disposed side by side, the inner ends of said barrels being interconnected, an elongated stem disposed centrally and longitudinally of said member and integrally formed therewith for the dual purpose of providing a fluid passage to the inner ends of said barrels and for also constituting a mechanical support for the device and its connections. v

10. A duplex fluid pressure regulating valve comprising, inmcombination, 4 a bod)T portion having two adjacent open-ended cylinders therein terminatingiat the front end retirees in a common Huid chamber, sel Hufl clem ber having an inlet and. two outlets for the fluid, pistons sldable in Seidl. cylinders,

springs pressing against the rear of seid ,pis-

tons, closure members for the rem ends of' said cylinders, means for closing said outlets operated by said pistons, a, drainage duct connecting the spring chambers of both cylinders and connecting with the Huid duct beyond the second outlet closing means, the first piston being adapted toy operate at e lower Huid pressure in said common chamber than the second piston. f

In testimony whereof I ax myv signature.

CHARLES H. m

Images