Chemical additive mixing pump for nuclear power station

A technology of chemical additives and mixing pumps, which is applied to components, pumps, and pump components of elastic fluid pumping devices, and can solve problems such as complex assembly, mechanical seal end face damage, and no mechanical seal vent hole. To achieve the effect of long-term operation extension, shortening axial dimension and best sealing effect

CN102146936AActive Publication Date: 2011-08-10SHANGHAI APOLLO MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-08-10

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Abstract

The invention discloses a chemical additive mixing pump for a nuclear power station, which adopts a straight tapered water-absorbing room to lead liquid to flow in a straight tapered contraction pipe, thereby ensuring that the flow velocity is gradually increased, the distribution is uniform, the hydraulic loss is small, and a uniform velocity field is arranged at an inlet of an impeller; the impeller is matched and locked with a locking structure of a pump shaft through external threads of a special locking bolt and internal threads at the shaft end of the pump shaft; the spherical surface of the locking bolt completely conforms to the hydraulic shape of the impeller, so that the locking bolt is integrated with the streamline shape of the impeller into a whole after being installed, thereby maximally ensuring that the inlet water flow of the impeller is not affected; meanwhile, the diameter of the pump shaft and the specification of a bearing can be increased; the larger bearing can be prolonged in service life and also can bear larger load; a pump body is connected with a pump cover in such a manner that the pump cover is directly pressed between the pump body and a bearing body to shorten the overall axial dimension of the pump; and a bearing oil sealing device achieves the ideal sealing effect by adopting the labyrinth sealing, so that no leakage of lubricating oil exists in the endurance test of 400 hours.
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Description

technical field

[0001] The invention relates to a pump, in particular to a chemical additive mixing pump used in nuclear power plants. Background technique

[0002] The safety level of the chemical additive mixing pump is RCC-P3 (nuclear level 3), the manufacturing level is RCC-M3, it belongs to the EAS system (containment spray system), and it is located in the fuel building of the nuclear island of the nuclear power plant.

[0003] During the normal operation of the nuclear power plant, the chemical additive mixing pump runs intermittently for 20 minutes every 8 hours to homogenize the NaOH solution in the chemical addition tank; part of the flow is used to prevent the injector suction pipe submerged in the NaOH solution from clogging.

[0004] The existing chemical additive mixing pumps used in nuclear power plants have the following defects:

[0005] 1. The water absorption chamber of the pump body is a straight pipe type, the hydraulic loss is relatively large, and the...

Examples

Embodiment Construction

[0024] In order to better understand the technical solution of the present invention, it will be described in detail below through specific embodiments in conjunction with the accompanying drawings:

[0025] see figure 1 , the chemical additive mixing pump used in nuclear power plants of the present invention includes a stator assembly, a rotor assembly, a bearing assembly and a shaft seal assembly. The stator assembly includes a pump body 1, a pump cover 3 with a mechanical seal chamber and a pump body seal ring 2; the rotor assembly includes a pump shaft 4, an impeller 5 and a shaft sleeve 7; the bearing assembly includes a Bearing body 8, bearing, two oil retaining pans 17 and two bearing end covers 16; the shaft seal assembly includes a mechanical seal device 18 and a bearing oil seal device, wherein:

[0026] The pump body 1 includes a horizontally arranged inlet flange 11, a water absorption chamber 12 and a volute 13. The water absorption chamber 12 is tapered from lar...