SU1216438A2 - Self=priming pumping unit - Google Patents

Description

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The invention relates to the field of pump construction, namely to the designs of self-priming centrifugal pumps, and is an improvement of a pump unit according to bus number 1087694.

The purpose of the invention is to increase the service life of the pump unit.

FIG. 1 shows the assembly structure; in fig. 2, node I in FIG. one; FIG. 3 shows a section A-A in FIG. one.

The self-supporting pumping unit comprises a housing 1 and located therein on one shaft 2 installed in bearings 3, rotors 4 and 5 of a centrifugal and vacuum pumps, the first of which is fixed to shaft 2, and the second is connected to it by means of a friction clutch mechanism 6 and 7 of the pump suction are hydraulically connected by a line 8, having a body 9, with actuator 10 spring-biased relative to the housing, with an elastic diaphragm 11 located on the side of the chamber 12 connected to the pressure cavity 13 zhnogo pump. The unit further comprises a pressure spring 14, a stationary 15 and a movable 16 holder, and the frictional mechanism is made in the form of a disk clutch with the pressure slave 1 7 and the drive 18 disks. In this case, the disks 17 and 18 are connected by splines — the first with the rotor 5 of the vacuum pump, and the second with the shaft 2 mounted for axial movement in bearings 3 having a stop ring mounted on it

19 and spring-loaded by means of a pressure spring 14 with respect to the fixed casing 15, the spring 14 being located between the latter and the stop ring 19. The internal casing

20 bearings 3 are shifted in the direction opposite to the cavity 6 of the centrifugal pump. The stationary sleeve 15 is mounted on thrust bearings 21 secured in the housing 1. The slave 17 and the lead 18 discs of the friction mechanism are mounted with gaps 22 and 23, respectively, with respect to the shaft 2 and the rotor 5 of the vacuum pump. In this case, the rotor 5 of the latter is made with the channels 24 and is provided with spring-loaded balls 25 located therein. In the case 1, annular grooves 26 are made under the balls 25.

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The unit works as follows.

At the beginning of the operation of the unit shaft 2 under the action of the pressure spring 14

5 moves in the direction opposite to the suction cavity 6 of the centrifugal pump. The pressure discs 17 and 18 are compressed between the fixed 15 and the movable 16 holder. As a result, the torque is transmitted from the drive disks 18 connected to the shaft 2 to the driven disks 17 connected to the rotor 5 of the vacuum pump. Rotor 5 starts

15 to rotate, creating a vacuum in the suction cavity 7. In this case, the balls 25 are cut along the grooves 26, and the executive element 10 of the locking member 9 is pressed under the action of the spring

20 in the direction of the centrifugal pump. As a result, the suction cavity 6 of the centrifugal pump communicates with the suction cavity 7 of the vacuum pump.

25 When the vacuum pump is operated, a vacuum is created in the suction cavity 6 and the centrifugal pump is filled with liquid. As soon as the cavity 6 of the centrifugal pump is filled with liquid, the pressure cavity 13 of the centrifugal pump creates pressure under the action of the rotor 4. As the pressure in the pressure cavity 13 increases, the pressure in the chamber 12 associated with the cavity 13 increases. Through the elastic diaphragm I1, the pressure is transferred to Executive element 10 of the valve body 9, which is overcome

Q is the spring resistance, closes the line 8 and separates the suction cavities 6 and 7 of the centrifugal and vacuum pumps. At the same time, Baji 2 under the action of axial force,

5, the centrifugal pump acting on the rotor 4 moves towards the suction cavity 6 of the centrifugal pump, overcoming the resistance of the pressure spring 14. As a result

When moving the movable bore 16I, the distance between the last and the fixed bushing 15 increases and the grip between the lead 18 and the driven 17 discs disappears. The rotor 5 of the vacuum pump stops rotating in 55 seconds and hangs on the spring-loaded balls 25. The vacuum pump shuts off.

When the pump stops or fails, the pressure in the discharge cavity 13 of the centrifugal pump drops, the actuating element 10 of the shut-off member 9 moves towards the flexible diaphragm 11 and opens the line 8 together with the cavities 6 and 7 of the centrifugal and vacuum pumps. The axial force acting on the rotor 4 of the centrifugal pump disappears and the shaft 2 under the action of the spring 14 moves in the direction opposite to the suction cavity 6 of the centrifugal pump. The pressure plates 17 and 18 are compressed between the fixed 15 and movable 16 clips and provide the transfer of torque from the shaft 2 to the rotor 5 of the vacuum pump. With

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By rotating the rotor 5, the centrifugal pump is primed with liquid and its operation is restored. The design of the unit makes it reliable to operate, since wear and tear from the dry friction of the outer surfaces of the driving disks 18 against the inner surface of the rotor 5 of the vacuum pump and the internal surfaces of the driven disks 17 against the surface of the shaft 2 during operation of the unit with the vacuum pump disconnected is eliminated. 22 and 23 between the aforementioned details and exclusions

tS hang on the disks 17 and 18 of the rotor 5 of the vacuum pump.

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Editor A.Shishkin

Compiled by V.Devisilov

Tehred A.Kabinets Proofreader A.T.

979/41 Circulation 587 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, Proektna St., 4

Claims (1)

SELF-SUCTION PUMP UNIT according to ed. No. 1087694, characterized in that, in order to increase the resource of its work, the driven and leading disks of the friction mechanism are installed with gaps, respectively, relative to the shaft and rotor of the vacuum pump, while the rotor of the latter is made with channels and equipped with spring-loaded balls located in them, and in the case made annular grooves for balls. > ^eleven