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Multi-stage axial flow submerged pump with long shaft and method for conveying phosgene

An axial and long-axis technology, which is applied in the field of long-axis multi-stage axial flow submerged pumps and pressurized transport of phosgene or chlorine gas, can solve the problems of low pressure resistance, difficult maintenance, and high cavitation allowance requirements. Achieve long service life and avoid volume loss

Inactive Publication Date: 2011-05-18
甘肃银光聚银化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the disadvantages of the pump are as follows: ① strict requirements on medium inlet pressure, outlet pressure, temperature and cleanliness; ② high requirements on cavitation allowance; , ⑤ short suction
Vertical vane pumps used to transport flammable, explosive, highly toxic and other harmful chemical liquids, in order to ensure safe and reliable transport medium and prevent leakage, have strict requirements on the shaft seal of the pump, that is, the seal should achieve zero escape, This is difficult to achieve with ordinary mechanical seals
At present, there is a kind of submerged pump that proposes to use gas for sealing. It passes sealing gas into the sealing box. The emergency sealing protection of the main seal failure is realized through the rubber sealing bag. This kind of gas sealing is not suitable for other conditions. vertical pump used

Method used

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  • Multi-stage axial flow submerged pump with long shaft and method for conveying phosgene
  • Multi-stage axial flow submerged pump with long shaft and method for conveying phosgene
  • Multi-stage axial flow submerged pump with long shaft and method for conveying phosgene

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Embodiment Construction

[0033] The following examples serve to further illustrate the method of the present invention. The spirit and scope of the present invention disclosed above are not limited by these examples.

[0034] preferred embodiment

[0035] The invention is further illustrated by means of the drawings. exist figure 1 In the schematic cross-sectional view of the long-axis multi-stage axial flow submerged pump shown, the upper end of the pump body is a bearing bracket (28), which is equipped with a bearing and a shaft sleeve (24), a bearing oil seal (23), and a grease nozzle (29). . The lower end of the bearing bracket (28) is connected to the fixed sealing cavity (19), and the lower end of the sealing cavity (19) is fixed on the flange seat (14) of the pump body, and the stuffing box (13) and the rubber sealing air bag (17) are arranged on the flange seat ), wherein the nitrogen inlet pipe (18) communicates with the air seal ring (15) in the middle of the filler through the hole, and...

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PUM

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Abstract

The invention relates to a multi-stage axial flow submerged pump with a long shaft and a method for conveying phosgene, which are mainly used for pressurizing and conveying the phosgene or chlorine gas. The submerged pump is provided with an inducer (1), a primary impeller (2), a secondary impeller (5), an auxiliary sliding bearing and shaft sleeve (6), a lower main sliding bearing and shaft sleeve (8), an upper main sliding bearing and shaft sleeve (10), a seal cavity (19) and a bearing bracket (28). The lower end of a packing box (13) is provided with an emergency seal rubber pneumatic bag (17); a double-end face mechanical seal (22) is sleeved on a pump shaft (30); a radial balancing hole (37) is arranged on the impeller; and the auxiliary sliding bearing and shaft sleeve (6) is made from silicon carbide. When both of the mechanical seal and the packing seal become invalid, high pressure nitrogen gas ensures that the emergency seal rubber pneumatic bag (17) is inflated to clasp the shaft so as to quickly block leakage of the conveyed phosgene.

Description

technical field [0001] The invention relates to a long-axis multi-stage axial flow down pump and a method for pressurizing and transporting phosgene or chlorine gas. Background technique [0002] At present, domestic isocyanate and other industries use shielded pumps imported or produced by joint ventures for pressurized transportation of toxic, harmful or corrosive liquids such as phosgene and chlorine. Practice has proved that the disadvantages of the pump are as follows: ① strict requirements on medium inlet pressure, outlet pressure, temperature and cleanliness; ② high requirements on cavitation allowance; , ⑤ short suction. Vertical vane pumps used to transport flammable, explosive, highly toxic and other harmful chemical liquids, in order to ensure safe and reliable transport medium and prevent leakage, have strict requirements on the shaft seal of the pump, that is, the seal should achieve zero escape, This is difficult to achieve with ordinary mechanical seals. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D13/08F04D29/22F04D29/046F04D29/08F04D7/02
Inventor 马建军张景川王进军汤汉球谢红军
Owner 甘肃银光聚银化工有限公司
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