US 2369249 A
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Description (OCR text may contain errors)
Feb. 13, 1945. Y RNNALTER 2,369,249
PUMPING DEVICE Filed Oct. 24, 19-59 2 Sheets-Sheet 1 a E1 a i G g a m s g m N am!! 7% i /4 Ii \O [a I IIIIIIIIIIIIIIIIIIIII I ['1 l I I I |l & III/A W INVENTOR Hermon RainoHe/r ATTORNEYS Feb. 13, 1945. H. RAINALT ER 2,369,249
PUMPING DEVICE Filed Oct. 24-, 1939 1 2 Sheets-Sheet 2 INVENTOR Herman Rainaner ATTORNEYS Patented Feb. 13, 1945 UNITED STATES PATENT OFFICE 2,369,249 PUMPING DEVICE Herman Rainalter, Cumberland, Md., assignor to Celanese Corporation of America, a corporation of Delaware Application October 24, 1939, "Serial No. 300,911
This invention relates to fluid pumping devices and relates more particularly to pumping devices of the gear wheel type for delivering artificial silk spinning solutions under pressure without danger of leakage.
In pumping devices of this type, as heretofore commonly constructed, considerable difficulty was experienced due to leakage of solution from the pumping device. This leakage was due to the fact that the large clearance required between the end of the gland box and the shaft permitted the relatively easy entrance of solution to the packing. Moreover, the substantial deflection of the gear wheel shaft under the pressure load made it impossible for the packing to become set. Under these conditions the spinning solution quickly penetrated the packing and. when hardened by heat and pressure made the packings ineffective.
It is an object of this invention to provide a pumping device of the gear wheel typewhich will be free from the above mentioned and other disadvantages and which will be especially simple in construction and efficient in operation.
Another object of this invention is the provision of a pumping device having an improved arrangement for reducing the pressure on the packing and for substantially preventing leakage of solution to the gland.
Other objects of this invention, together with certain details of construction and combinations of parts, will be described in the specification and pointed out in the claims.
According to this invention a pumping device of the gear wheel type has; inserted in the end of the gland box a ring closely fitted to the gear wheel shaft. Shaft deflection is taken care of by providing clearance between the edge of the ring and the seat. Any solution leaking through or around the ring is bled off to the suction side of the pump by means of an annular T-bar havin openings therein communicating with a port through the gland box and pump casing, which port leads into the suction side of the pump. The T-bar is firmly fixed in the gland box and does not rotate. By these means the gland pressure is reduced from around 275 pounds per I square inch (the pressure in pumps of prior construction) to 25 pounds per square inch when the pump pressure is approximately 400 pounds per square inch without loss in pump capacity.
The packings have been found to hold quite well at the reduced pressure.
The accompanying drawings illustrate a preferred embodiment of this invention, it being understood, however, that it is given merely by way of example and is in no way limitative.
Figure 1 is a vertical sectional view of the pumping device in accordance with this invention,
Figure 2 is also a vertical sectional view of the pumping device, taken on line 22 in Fig. 1, Figure 3 is a detail View, on an enlarged scale, of the arrangement for preventin leakage of solution to the gland, Figure 4 is also a detail view, taken on line 4-4 in Fig; 3, showing the T-bar in position in the gland box and communicating with the port in the pump casing, and
Figure 5 is an enlarged detail view of the T- bar.
Like reference numerals indicate like parts throughout the several views of the drawings.
Referring to the drawings, reference numeral 6 indicates the casingof a pumping devicewithin which are mounted gear wheels I and 8 adapted upon rotation to force spinning solution or other liquid under pressure through the discharge opening 9. The gear wheels 1 and B are fixed to shafts II and I2, respectively, the shaft II being driven by any suitable driving means l3 extraneous to the pumping device. Gear wheel I rotates gear wheel 8 and shaft l2 on which the latter is mounted. The driven shaft H extends through the pump casing 6, passing through gland boxes 14 and IS, the construction of which Will hereinafter be described. The ends of the shaft are carried in roller bearings I6 mounted in bearing housings I! supported on suitable standards l8.
The arrangement for reducing leakage to and pressure on the glands will now be described,,it being understood that this arrangement may be employed on one or all four of the glands of the pumping device. For simplicity, only one of the gland structures will be described and in this connection reference is particularly directed to Figs. 3, 4 and 5. Accordingly, a ring ii) of any suitable metallic material and having a close fit,
i. e. a running fit, around shaft II is mounted in a seat 2| in the end of the gland box l4. There is a slight clearance between the edge of the ring and the wall of the seat 2| to take care of the deflection of shaft II under the pressure obtaining during the operation of the pumping device. Since the fit of the ring l9 around shaft H is a close fit and since there is clearance between the edge of the ring and the wall of seat 2|, the ring may be considered a floating ring. However, there is substantially no rotation of the rings l9 due to the fact that the relatively high,