SU1359497A1 - Combination seal of centrifugal pump - Google Patents

Abstract

The invention relates to contactless seals of hydraulic units and allows to increase the volumetric and energy efficiency of the pump by reducing the pressure in the chamber (K) to drain leaks and reducing the power consumed by the impeller (I). A glass 9 with a throttle 10 and discharge channels is installed on the pump casing 2 in a K 4 drain outlet. In the glass is -I. 5. The choke is installed between K 4 and the smooth side 7 And 5. The discharge channels are placed above AND 5. Part of the fluid through the choke enters the entrance to And 5 and is drained to K 4. Flow rate through the smooth side And 5 given the minimum of the conditions of the latter without boiling. Since the power loss of the smooth side And 5 depends on the flow rate of the fluid, with the decrease in the flow rate of leaks through the side 7 And 5, the power of friction decreases. 2 Il. s (L with JV CO N QD s cpue.J, g

Description

one

The invention relates to a pump construction, in particular to the beta: contact seals of hydraulic units.

The purpose of the invention is to increase the volumetric and energy efficiency of the pump by reducing the pressure in the leakage chamber and reducing the power consumed by the impeller;

FIG. 1 shows a seal longitudinal section; in fig. 2 shows section A-A in FIG. one.

The combined seal of the centrifugal pump contains a slotted seal 1 located between the housing 2 and the impeller 3 of the pump, the leakage drainage chamber 4, soob. valuable with a pump suction area (not shown), an impeller 5 with a blade and smooth sides 6 and 7, mounted on the shaft 8 of the pump in chamber A of the leakage drainage. The seal is equipped with a cup 9 with a throttle 10 and discharge channels 11 (see Fig.2) mounted on the pump casing 2 in the leakage discharge chamber 4, and the impeller 5 is located in the glass 9. The throttle 10 is installed between the smooth side 7 of the impeller 5 and a leakage chamber 4, and the discharge channels 1 are located above the impeller 5 and can be performed tangentially to the flow of fluid ..

The device works as follows.

The leakage of fluid through the annular gap of the slit seal 1 enters the chamber 4 of the leakage drainage. The main part of the leakage Qnni, H3 chamber 4 is diverted directly to the pump inlet. Part of the fluid flow through the choke 10 is fed to the input

13

five

into the impeller 5 and through the tangential channels 11 into the chamber 4. The flow of fluid through the smooth side 7 of the impeller 5 is set to the minimum of the condition of the latter without

boil. I

Since power loss is smooth. depending on the flow rate of the fluid, the friction power decreases as the flow rate of the qufn leakage through the smooth side 7 of the impeller 5 decreases. Supplying the seal with the cup 9 also makes it possible to reduce the pressure in the leakage chamber 4 and, consequently, reduce the Qum value.

I

Claims (1)

Invention Formula A combined centrifugal pump seal containing a slit seal located between the pump casing and the impeller, a leakage chamber, connected to the pump suction area, an impeller with a blade and smooth sides, mounted on the pump shaft in the leakage chamber, characterized in that , in order to increase the volumetric and energy efficiency of the pump by reducing the pressure in the leakage chamber and reducing the power consumed by the impllator, the seal is equipped with a cup with a throttle and discharge channels, mounted on the pump casing in the leakage chamber, and the impeller is located in a glass, while the throttle is installed between the smooth side of the impeller and the leakage diversion chamber, and the discharge channels are located above the impeller. Editor I.Rybchenko Compiled by Yu.Nikitchenko Techred. I.Popovich Proofreader M.Sharoshi Order 6132/36 Circulation 571 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d; 4/5 Production and printing company, Uzhgorod, st. Project, 4 (tis.z