CN202597247U

CN202597247U - Pumping chamber for PCS (process control system) recirculating pump

Info

Publication number: CN202597247U
Application number: CN 201220118671
Authority: CN
Inventors: 陆金琪; 李何琴
Original assignee: Shanghai Apollo Machinery Co Ltd
Current assignee: Shanghai Apollo Machinery Co Ltd
Priority date: 2012-03-27
Filing date: 2012-03-27
Publication date: 2012-12-12
Anticipated expiration: 2022-03-27

Abstract

The utility model discloses a pumping chamber for a PCS (process control system) recirculating pump. The pumping chamber comprises a spiral overflow passage, wherein the spiral overflow passage is positioned between the inner wall of a volute chamber and the outer circumference of an impeller of the volute chamber, the volute chamber is a single-volute type volute chamber, an outlet pipe is arranged on the outer wall of the volute chamber, and the tail end of a water outlet pipe is provided with an outlet flange. The pumping chamber has the technical scheme that the cross section area of the outlet pipe is favorably reduced, the flow velocity at the outlet flange part is reduced, the local resistance loss of water at the outlet flange is reduced, the efficiency of the PCS recirculating pump is improved, and the burnout of a matched motor is avoided.

Description

A kind of pumping chamber that is used for the PCS recirculating pump

Technical field

The utility model relates to a kind of pumping chamber of the PCS of being used for recirculating pump.

Background technique

The PCS recirculating pump is to be used in a kind of recirculating pump that often uses in the pcs system of nuclear power station; Pcs system is also referred to as and is non-passive safety shell cooling system; The effect of this system is: when coolant loss (LOCA) or main steam pipe cut (MSLB) accident take place, derive heat in the safety in containment, reduce the temperature and pressure of containment; Reduce the pressure reduction of containment atmosphere and external environment condition, the release of radioactive material after the restriction accident.Also as the nourishment source in spentnuclear fuel pond, the pcs system critical piece comprises PCS: non-passive safety shell cooling water container (PCCWST), air deflection plate (airbaffle), air inlet and air outlet slit, water distribution system.In addition, also have the auxiliary water storage tank (PCCAWST) of non-passive safety shell cooling and two PCS recirculating pumps, use recirculating pump to pcs system extra cooling water to be provided at the scene, can also the reserve moisturizing be provided for the antidetonation water tower of fire-fighting system from PCCAWST.

Said PCS recirculating pump comprises pumping chamber; Said pumping chamber is the flow channels between from the impeller outlet to the outlet(discharge) flange; Water gets into said pumping chamber from the impeller outlet on the excircle that is arranged at said impeller, through outer pipe and said outlet(discharge) flange, discharges said pumping chamber again.In said PCS recirculating pump, the function of said pumping chamber is to reduce the flow stream velocity of water in said pumping chamber, makes the kinetic energy of institute's water convert pressure energy to.If adopt traditional double volute type spiral case chamber, will cause the section area of said outlet(discharge) flange excessive, thereby cause water to increase severely at the flow velocity of outer pipe end section, the local resistance loss of water is big, thereby causes pump efficiency to reduce, even burns the adapted motor.

The model utility content

The purpose of the utility model is in order to overcome the deficiency of existing technology, a kind of pumping chamber of the PCS of being used for recirculating pump to be provided.It helps reducing the section area of the outer pipe of pumping chamber, reduces the flow velocity of water at said outlet(discharge) flange place, improves the efficient of said PCS recirculating pump.

A kind of technological scheme that realizes above-mentioned purpose is: a kind of pumping chamber of the PCS of being used for recirculating pump comprises a spiral flow channels;

Said spiral flow channels is at the inwall of spiral case chamber and be built between the excircle of impeller of said spiral case chamber; Said spiral case chamber is single volute type spiral case chamber; An outer pipe is set on the outer wall of said spiral case chamber, and the end of said outlet pipe is provided with outlet(discharge) flange.

Further, said outlet pipe is arranged at the top of said spiral case chamber, and is perpendicular to that the level ground is provided with.

Adopted the pumping chamber of a kind of PCS of being used for recirculating pump of the utility model, the spiral case chamber that promptly said pumping chamber adopted is the technological scheme of single volute type spiral case chamber.Its technique effect is: help to reduce the section area of outer pipe, reduce the flow velocity of water at the outlet(discharge) flange place, reduce the local resistance loss of water at outlet(discharge) flange, improve the efficient of PCS recirculating pump, avoid the adapted motor to be burnt out.

Description of drawings

Fig. 1 is used for the schematic representation of axial cross section of the pumping chamber of PCS recirculating pump for the utility model a kind of.

Fig. 2 is a kind of axial arrangement schematic representation that is used for the pumping chamber of PCS recirculating pump of the utility model.

Embodiment

See also Fig. 1 and Fig. 2,, pass through embodiment particularly below, and combine accompanying drawing at length to explain in order to understand the technological scheme of the utility model better:

See also Fig. 1 and Fig. 2; Comprise a spiral flow channels 3; Said spiral flow channels 3 is at the inwall of spiral case chamber 1 and be built between the excircle of impeller 2 of said spiral case chamber 1; Said spiral case chamber 1 is single volute type spiral case chamber, and an outer pipe 11 is set on the outer wall of said spiral case chamber 1, and the end of said outlet pipe 11 is provided with outlet(discharge) flange 12.

The purpose of design is like this: such pumping chamber is simple in structure; Help to reduce the section area of outer pipe, reduce the flow velocity of water, reduce the local resistance loss of water at outlet(discharge) flange at the outlet(discharge) flange place; Improve the efficient of PCS recirculating pump, avoid the adapted motor to be burnt out.

Said outlet pipe 11 is arranged at the top of said spiral case chamber 1.And said outer pipe 12 is perpendicular to the setting of water bottle bottom surface.The purpose of design is like this: can dwindle the axial length of said PCS recirculating pump, make the boundary dimension of said PCS recirculating pump be no more than the maximum value that nuclear power plant system allows.

Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the utility model; And be not the qualification that is used as the utility model; As long as in the connotation scope of the utility model, all will drop in claims scope of the utility model the above embodiment's variation, modification.

Claims

1. a pumping chamber that is used for the PCS recirculating pump comprises a spiral flow channels (3); It is characterized in that:

Said spiral flow channels (3) is positioned at the inwall of spiral case chamber (1) and is built between the excircle of impeller (2) of said spiral case chamber (1); Said spiral case chamber (1) is single volute type spiral case chamber; An outer pipe (11) is set on the outer wall of said spiral case chamber (1), and the end of said outlet pipe (11) is provided with outlet(discharge) flange (12).

2. a kind of pumping chamber that is used for the PCS recirculating pump according to claim 1 is characterized in that: said outlet pipe (11) is arranged at the top of said spiral case chamber (1), and is perpendicular to that the level ground is provided with.