DE480842C - Device for cooling the stuffing boxes in hot water pumps - Google Patents

Description

Device for cooling the stuffing boxes in hot water pumps Operation of a pump with ordinary stuffing boxes with hot water from the stuffing boxes escaping leakage water develops steam, which is usually condensed water in the lubricating oil and the bearings are heated to an unacceptably high level, stuffing boxes are used when the water is hot mostly chilled. It is known to arrange such cooling so that the to be cooled and pressurized water to be sealed before it comes to the actual sealing point, must brush over cooling surfaces that are cooled on the outside. This arrangement is essential Disadvantage in that the cooling surface required for effective heat dissipation is very large takes up useful construction space, which usually results in a substantial increase in size the bearing distance leads. Other known designs again carry the cooling water for direct shaft contact in an intermediate packing ring. It must be the leakage water mix with the cooling water and is lost if the latter is not of the same quality as the material being conveyed.

According to the invention, cooling water for immediate use is also in the stuffing box Wave contact introduced but at the same or approximately the same pressure as the internal pressure to be shut off. As a result, it is achieved that practically neither pumped water escapes, raw cooling water can still get into the conveyed water. To the cooling water pressure To keep the sealing pressure equal to the required extent, for example, the Difference in temperatures between the water to be sealed and the cooling water for this can be used to help by thermally actuating a pressure regulator.

The drawing represents such an exemplary embodiment of the invention in a longitudinal section through one end of a centrifugal pump.

w is the pump shaft, s the stuffing box, a a space, whose Temperature acts by means of the thermostat b on the pressure regulator c for the cooling water. This first flows through this pressure regulator c, then into space a 'to the shaft w. Is the cooling water pressure in space d greater than the pressure to be sealed in space e, cooling water flows through the switched-on intermediate space a to space e, where the room a becomes cold. In the opposite case, however, room a becomes warm. Using the Thermostat b becomes a middle one in room a between the two temperatures Maintain temperature, which in turn requires that water neither after inside, still flowing outwards.

The amount of cooling water required for cooling is provided by outflow from an auxiliary throttle point of the diaphragm f, which is switched on after the cooling point d ensured. In the case of smaller cooling capacities, the packing rings can also be used g draining water leakage is sufficient for shaft cooling.

Claims (1)

PATENT CLAIMS: r. Device for cooling the stuffing boxes in hot water pumps by means of cold water, whereby the cooling water touches the shaft directly, thereby characterized in that the pressure of the cooling water automatically changes to the pressure of the shut-off Hot water is regulated. a. V_ device according to claim z, characterized in that that the pressure control by means of thermostats o. The like. Done in such a way that in one Gap (a) between cold and hot water has a certain mean temperature is maintained between the two waters. 3. Device according to claim a, characterized by the arrangement of a throttle regulator (c) of the cooling water the cold point (d) and an auxiliary throttle point (f) after the cold point.