SU1236176A2 - Device for closing-off ejector nozzle - Google Patents

Description

The invention relates to a pump engineering industry and can be used in the design of recycling self-priming centrifugal pumps.

The purpose of the invention is to increase the efficiency of shutting down the ejector by using free-stream energy.

FIG. 1 shows a device with an open ejector, a longitudinal section; in fig. 2 - device with overlapped ejector.

The device for blocking the ejector nozzles of a self-priming pump of recirculation type contains movable 2 and stationary 3 elements forming the annular nozzle 1. The movable element 2 of the ejector is made in the form of a spring-loaded sleeve 4 with a flange 5, the axial movement of which is carried out due to the force acting on the flange and caused by the pressure difference in the nozzle 1 of the ejector and in the cavity 6 connected to the discharge line of the pump. The spring-loaded sleeve 4 is provided with a confusor socket 7 rigidly connected to it, located on the suction side 8, while the inner

0

the surface 9 of the socket 7 smoothly mates with the inner surface of the sleeve 4. Springing of the sleeve 4 is performed by the spring 10.

The device works as follows.

When the pump is not running and during the self-priming period, the sleeve 4 is pressed by the spring 10 to the extreme right (Fig. 1) in which the annular nozzle 1 of the ejector is open. At the end of self-priming, the pressure in cavity 6 due to its communication with the discharge line of the pump increases to the value corresponding to the generated pump head. Under the action of this pressure on the annular surface of the flange 5 of the sleeve 4 and under the action of the force of fluid flow in the pump suction line onto the surface 9 of the socket 7, the sleeve 4 together with the flange 5 and the socket 7 moves until it touches the stationary element 3, blocking the ejector nozzle 1.

Thus, the proposed device makes it possible to efficiently use the force of the incident flow of fluid in the suction line of the pump for axial displacement of the sleeve without additional blocking up the flow section of the liquid path of the sleeve.

Compiled by I. Bikbulatov

Tehred I. VeresKorrektor A. Obruchar

Circulation 586 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

FIG. 2

Claims (1)

DEVICE FOR BLOCKING THE EJECTOR NOZZLE by ed. St. No. 234869, characterized in that, in order to increase the efficiency of disconnecting the ejector by using the energy of the incoming flow, the spring loaded sleeve is equipped with a confuser socket rigidly connected to it located on the suction side, while the inner surface of the socket smoothly mates with the inner surface of the sleeve. SU ,,,, 1236176 figure 1