RU1443529C - Pump - Google Patents

Abstract

The invention improves the reliability of pumps when disabling auxiliary water make-up systems by providing cooling and lubrication of the support and seal. A shut-off element 18, a non-return valve (OK) 19 and a hydraulic resistance (HS) 20 are installed in series on the pipeline 17. HS 21. Additional OK 16 is communicated by its outlet 22 with circuit 1 after purifier 5, and by an input with circuit 8 for supplying recirculation water between the refrigerator 10 and HS 13. Parallel to auxiliary pump 11, uaanovpen OK 24. 1 ill.

Description

The invention relates to the field of pump engineering. in particular, to the design of powerful pumps equipped with auxiliary water make-up systems, and is an improvement of the pump according to autoswitch. USSR No. 642517.

The purpose of the invention is to increase reliability when the auxiliary pump is turned off by providing cooling and lubrication of the support and seal.

The drawing schematically shows a General view of the pump.

The pump comprises a water supply circuit 1 to the shaft sealing unit 2 connected to an external source 4 and including a purifier 5 with outlet b and a refrigerator 7, and a recirculation water supply circuit 8 for lubricating and cooling the shaft support 9 of the shaft 3 with the refrigerator 10 connected in series , an auxiliary pump 11 and an impeller 12. The recirculation water supply circuit 8 is provided with a hydraulic resistance 13 installed behind the refrigerator 10. and in the water supply circuit 1, an additional cleaner 14 is installed in the shaft sealing unit 2, the outlet 15 of which is connected to the recirculation water supply circuit 8 between the auxiliary pump 11 and the hydraulic resistance 13. The pump is equipped with an additional non-return valve 16 and a pipe 17 with sequentially installed shut-off element 18, a non-return valve 19 and a hydraulic resistance 20, which communicates with an external source 4 with a 9-shaft support 3, and in the outlet 6 of the cleaner 5 of the circuit 1 of the anode supply to the sealing unit 2, an additional hydraulic resistance 21 is installed, while the additional check valve 16 is communicated by its output 22 to round 1 of the water supply to the sealing unit 2 after the purifier 5, and the inlet 23 with the recirculation water supply circuit 8 between the refrigerator 10 and the hydraulic resistance 13. A check valve 24 is installed in parallel with the auxiliary pump 11.

The pump operates as follows.

When the pump rotates, the impeller 12 pumps water along the circuit 8, which transfers heat to the refrigerator 10, returns to the inlet of the impeller 12, while passing through

support 9, cooling and lubricating it. When the fluid circulation pump is parked, circuit 8 is carried out by an auxiliary pump 11. In circuit 1, coolant is supplied from an external source 4, followed by cleaning it in cleaner 5, further cooling in refrigerator 7, additional cleaning in cleaner 14, and then to the unit 2 seals. At

cessation of water supply from an external source 4, circuit 1 receives recirculated water from circuit 8 through a refrigerator 10 and a check valve 16, then the liquid passes through a refrigerator 7,

purifier 14 and enters the cooling unit 2 of the seal.

In emergency conditions (during interruptions in the supply of cooling water to refrigerators

7 and 10, or when the electric drive of the auxiliary pump M is de-energized, when the main pump is installed with a hot circuit), the water temperature in circuit 8 rises. Normally closed valve 16 opens and

water starts to flow from circuit 1 from an external source of coolant 4 through a pipe 17 with a non-return valve 19 and a resistance 20 (metering the flow rate into the support 9) installed on it

to cool the support 9 and further into the hot zone of the pump through the gap between the rotating parts of the shaft 3 and the housing parts. With the simultaneous shutdown of water supply from external source 4 and shutdown

the auxiliary pump 11 of the circulation along the circuit 8 is carried out by natural circulation through the refrigerator 10, the resistance 13, the check valve 24, the support 9 and the elements of the recirculation circuit 8

over the thermal barrier. At the same time, from the refrigerator 10, through the non-return valve 16, the liquid enters the refrigerator 7, the cleaner 14 and into the seal unit 2, as well as through the cleaner 5 and the hydraulic resistance 21, blocks the flow of hot liquid, preventing it from entering the seal unit 2.

(56) Copyright certificate of the USSR No. 954628, cl. F 04 D 29/06. 1978.

USSR copyright certificate N5 642517, cl. F 04 D 29/10, 1977.

514435296

Claims (1)

The claims are an external source with a shaft support, and Nfe 642517, a t-purifier of the water supply circuit to the unit, in the branch Pump, St. Petersburg, which, for the purpose of sealing, has an additional hydraulic increase in reliability upon shutdown. while the auxiliary pump, by means of an additional check valve, is provided with neither cooling nor lubrication of the support and is sealed by its outlet with a water supply circuit into the pump; with at-home distribution circuit with recirculation zapornymvody therefore established between the refrigerator and a hydraulic element, and a check valve, hydraulic-skim resistance. resistive