US2858973A - Steam nozzle for pulp producing apparatus - Google Patents

Description

Nov. 4, 1958 H. s. MESSING STEAM NOZZLE FOR PUMP PRODUCING APPARATUS Filed July 16, 1954 w W s o m T V T a A m V A M 3 /L fibrator or other apparatus.

United States Patent O STEAM NOZZLE For: PULP PRonUciNG APPARATUS '3 Claims. Cl. 230-92 This invention relates tdsteam-condensing and discharging devices, and more particularly to a type particularly adapted for use in connection with wood-pulp producing or treating apparatus.

In apparatus of the above-mentioned character, such as for example defibrators, rotary'feeders and other devices in which the stock is passed through a chamber or through a housing containing steam under considerable pressure, it is desirable to provide means by which steam can, at specified locations, be condensed and discharged to facilitate the operation of the apparatus. For example, in thejcase of a rotary feeder, the elimination of a substantial portion of the steam out of the pockets of the feeder as each of the pockets move toward the filling point is desirable. In the case of a de fibrator it is desirable to discharge the steam at certain locations and to provide means by which such discharge and condensation can be'controlled. It is therefore one of the objects of the present invention to provide means for discharging the steam at a controlled rate in apparatus of the above-mentioned character and to condensethe steam as discharged. It is another object of the invention to provide means for controlling the rate of steam discharge.

With these and other objects to be hereinafter set forth in view, I have devised the arrangement of parts to be described 'and more particularly pointed out in the claims appended hereto.

In the accompanying drawing, wherein an illustrative embodiment ofthe invention is disclosed,

Fig. 1 is a vertical sectional view through a steam discharging means constructed according to the invention, and

Fig. 2 is a sectional view showing the device as applied to a rotary feeder. Referring to the drawing, and particularlyto Fig. 2 thereof, 1 indicates a portion of the housing of a de- The same is provided with a lining indicated at 2, said lining being formed with the steam-outlet aperture shown at 3. Extending integrally from the housing 1 is a cylindrical boss 4, provided at its outer end with a radial flange 5 against which is secured a casing 6. The casing 6 is clamped between the flange 5 and an annular plate or disk 7, which is in turn held against the casing 6 by the flanged end 8 of a pipe 9. The bolts 10, passing through the flanged end 8, as well as through parts of the casing 6 and flange 5, hold these parts together in the relationship clearly shown in Fig. 2.

The casing 6 is provided with an extended cylindrical portion or sleeve 11 which fits within and is surrounded by the boss 4 of the housing, the bore through the -cylindrical portion or sleeve 11 being disposed co-axially with the opening 3. Extending axially through the casing 6 as well as through its cylindrical portion 11, is a nozzle 12 provided at one end with a plug portion 13 which is externally threaded as indicated at 14 for engagement with internal threads provided within the cylin- 2 drical portion or sleeve ll adjacent to one end of the same. This plug portion 13 serves to thereby close the inner end of the cylindrical portion or sleeve 11.

The nozzle 12 is provided with an axial passage 15 which has its effective diameter reduced at its inner end by means of the threaded insert 16 having a central jet opening 17 axially aligned with the passage 15 through the nozzle, thus constituting a reduction in the effective diameter of the passage at its inner end as above stated. It will be noted that the opening 3, jet opening 17 and axial passage 15 are all axially aligned to permit the passage of steam from the interior of housing 1 and into the pipe 9 to condense and be returned to the stock chest.

Near the free or outlet end 18 of the nozzle 12 the casing 6 is provided with a chamber 19 which surrounds the nozzle, and since the internal diameter of the housing 6 is greater than the nozzle for most of the length of the latter, there is provided around the nozzle for the greater portion of its length, an annular fluid chamber 20 with which chamber 6 communicates. It is therefore obvious, as clearly shown in Fig. 2, that water or other fluid entering into the chamber 19 of the casing' 6 will flow through the annular chamber 20 and surround the nozzle 12 and cool the same. Thus, the casing 6 and its extended cylindrical portion or sleeve 11 constitutes a water or fluid jacket about the nozzle 12.

The passage 15 extending through the nozzle 12 is tapered from the insert 16 to the free end 18 of the nozzle, or that part which is located at the entrance to the pipe 9, where the end 18 of the passage 15 is flared.

' It will also be noted that the plate 7 surrounding the nozzle adjacent to its flared end 18, is provided with a constricted opening 21 to thus control and increase the pressure of the flow of water or other fluid out of the chambers 20 and 6. A supply pipe' 22, has an end threaded in the port 23, extending radially from the chamber 19 so that Water or other fluid passing through the pipe 22 under pressure will be forced into chambers 6 and 20 to surround the nozzle 12 and then be forced out through the constricted opening 21 to enter in and flow down through the pipe 9. A valve 24 located in the pipe 22 can be used to control the flow of water through the pipe.

From the foregoing, the operation of the described apparatus will be apparent. From the steam-filled chamber 1 of the defibrator or other device, the steam can pass out through the aligned openings 3 and 17 and out through the passage 15 of the nozzle 12. The water or other cooling fluid, such as the liquor with which the stock is treated, can be caused to flow at a required rate through the pipe 22 by manipulation of valve 24, and the liquid will flow into chambers 6 and 20. This will cool the nozzle 12 and will aid in condensation of the steam as it passes through the nozzle 12 on its way toward the pipe 9. In addition, the water or other liquid will be ejected through the constricted annular opening 21 and with a siphoning or spray action will tend to draw out the steam and condensate through the nozzle 12 and into the pipe 9, which will return it to the stock chest or elsewhere as required by the particular apparatus of which the described structure forms a part. It will be apparent that a control of the discharge of the steam can be had by the rate of water flow through the constricted opening 21. That is to state, the more water caused to flow, thegreaterwill be the suction effect around nozzle 12 and thus a greater discharge of the steam and its condensate out of the nozzle.

In the embodiment of the invention shown in Fig. 1, the structure of the discharge and condensing apparatus is similar to that described, except that the same is shown as applied to a feeder of the rotary type. Such a feeder includes a housing 25 within which the rotary feeder 26 is arranged to rotate, and is rotatively driven by any suitable means known in this art. In the form shown, the feeder 26 is shown as being provided with two diametrically-opposite pockets or recesses shown respectively at 27 and 28. The arrangementof these pockets is such that when one of the same is being charged with stock dropped through the inlet passage 29, the other pocket will be dumping or evacuating its load down through the outlet passage 30 and into the conduit 31 through which the stock passes to enter a digester or other apparatus. As the stock is evacuated from the downwardly-directed pocket in the feeder, steam under pressure in the outlet passage 30 and conduit 31 will enter and fill the pocket. Hence, when the feeder rotates counter-clockwise, as shown by the arrow in Fig. 2, it will move the steam-filled pocket indicated at 28 in a direction toward the refilling point. Intermediate of the inlet and outlet passages of the housing is located steamevacuating means of the structure shown in Fig. 2 and the same need not be further described except to state that the nozzle 12 aligns with the opening 3a formed in the lining 2a of the feeder.

When the steam-filled pocket 28 reaches the point shown in Fig. l and is in alignment with the opening or port 3a, the steam will be drawn out of the pocket 28 by the siphoning or spray action of the water flow, and the combined condensing and siphoning action will rid the pocket of the steam therein. Therefore, when the pocket 28 reaches a position in registration with the inlet passage 29, it will be relatively free of steam under pressure and the stock will enter and fill the pocket for conveyance to evacuation position.

Having described an embodiment of the invention, it is obvious that the same is not to be restricted thereto, but is broad enough to cover all structures coming within the scope of the annexed claims.

What I claim is:

1. A steam discharge means of the character described comprising, a housing containing steam under pressure, a tubular boss extending therefrom, a casing having a part fitted against one end of the boss, said casing including a tubular sleeve located within and spaced from the interior of the boss, a nozzle fitted Within the sleeve and closing one end of the sleeve, said nozzle having an axial passage having a reduced-diameter end in com munication with the interior of the housing and gradually increasing in diameter toward its other end, said lastmentioned end projecting beyond the casing, the nozzle having a substantial portion of its length spaced from the interior of the sleeve to thereby form a fluid chamber between the exterior of the nozzle and the interior of the sleeve, said chamber being open at one end rearwardly of the outlet end of the nozzle, a conduit leading into said chamber from a source of fluid under pressure, and a pipe connected at the outlet end of the nozzle and at the open end of the fluid chamber.

2. A steam discharge means of the character described comprising, a housing containing steam under pressure, a tubular boss extending from the housing, a casing fitted against the end of the boss, said casing having a tubular sleeve located within the boss and terminating at the junction of the boss with the housing, the housing having a lining provided with a steam outlet aligned with the boss, the sleeve having a nozzle member fitted within it and attached at one end to the end of the sleeve, said nozzle being for the greater portion of its length of an external diameter less than the internal diameter of the sleeve to thereby provide a water chamber between it and the interior of the sleeve, an outlet pipe attached to one end of the casing, one end of the nozzle extending out of the casing and projecting into said outlet pipe, the nozzle having a steam passage extending through it, said passage being of-reduced size at that end of the nozzle which is located at the end of the sleeve and which passage is of larger size at the end of the nozzle that projects beyond the casing, and a water inlet leading into the water chamber.

3. A steam discharge means of the character described comprising, a housing containing steam under pressure, a tubular boss connected to and extending from the housing, a casing fitted against the end of the boss, said casing having a tubular sleeve located Within and extending through the boss and terminating at the junction of the boss with the housing, the housing having a lining provided with a steam outlet aligned with the boss, the sleeve having an elongated nozzle member fitted within it and of greater length that the sleeve and attached at one end to the end of the sleeve, said nozzle being for the greater portion of its length of an outside diameter less than the internal diameter of the sleeve to thereby provide awater chamber between it andthe interior of the sleeve, an outlet pipe attached to one end of the casing and with which said water chamber communicates, one end of the nozzle extending out of the casing and entering into said outlet pipe, the nozzle having a passage extending through it, a plug in the end of the nozzle, said plug having an opening of less size than the passage through the nozzle, said plug being located at the inner end of the sleeve, the passage through the nozzle being of larger size than the opening through the plug, said passage flaring at the end of the nozzle that projects beyond the casing, and a water inlet leading into the water chamber.

References Cited in the file of this patent UNITED STATES PATENTS 894,758 Starre July 28, 1908 1,020,743 Burlingham et a1. Mar. 19, 1912 1,344,809 Merritt et al June 29, 1920 1,922,920 Aherne Aug. 15, 1933

Images