CN202597172U - Connecting structure for PCS (passive containment cooling system) recirculation pump - Google Patents
Connecting structure for PCS (passive containment cooling system) recirculation pump Download PDFInfo
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- CN202597172U CN202597172U CN 201220118785 CN201220118785U CN202597172U CN 202597172 U CN202597172 U CN 202597172U CN 201220118785 CN201220118785 CN 201220118785 CN 201220118785 U CN201220118785 U CN 201220118785U CN 202597172 U CN202597172 U CN 202597172U
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- pump
- mechanical seal
- chamber
- impeller
- spiral case
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Abstract
The utility model discloses a connecting structure for a PCS (passive containment cooling system) recirculation pump in the field of nuclear power equipment. The connecting structure comprises a pump body, a pump cover, an impeller, a shaft sleeve, a mechanical seal, a bearing body and a pump shaft, wherein the pump body is divided into a suction chamber and a volute chamber, the suction chamber is provided with an inlet flange and axially connected with the volute chamber through a connecting part, and an outlet pipe and an outlet flange are further arranged on the volute chamber; the impeller is arranged in the volute chamber and in sleeve joint with the tail end of the pump shaft and the connecting part; the pump cover and the mechanical seal are sequentially sheathed on the pump shaft and axially fixed with the pump body; the shaft sleeve is arranged between the pump cover and the mechanical seal and the pump shaft in the radial direction, a staircase structure is arranged on the outer wall of the shaft sleeve, and the section area which is close to one side of the pump cover is larger than the section area which is close to one side of the mechanical seal; a mechanically sealed cavity is surrounded by the shaft sleeve, the pump cover and the mechanical seal; and the bearing body is sheathed on the mechanical seal and the outer wall of the pump shaft.
Description
Technical field
The utility model relates to the linkage structure of a kind of PCS of being used for recirculating pump in nuclear power equipment field.
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 (air baffle), 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.
At present the PCS recirculating pump is because to be installed in nuclear power plant system inner, so its boundary dimension has received very big restriction.According to the mentality of designing of routine, the boundary dimension of PCS recirculating pump is with surpass the maximum value that nuclear power plant system allowed unavoidablely.The reason that causes above-mentioned situation mainly is two; The one, in order to guarantee that the PCS recirculating pump is after through outflow in the impeller of said PCS recirculating pump; Must be through a flow channels with certain-length, reduce flow velocity, the kinetic energy of water is transformed into pressure energy; In order to guarantee the length of this flow channels, the pump housing is difficult to reduce.The 2nd, in order to guarantee the heat radiation of mechanical seal and bearing support, the mechanical seal chamber must be enough big, and the area of bearing support outer wall also must be enough big, and such requirement has also limited further reducing of said PCS recirculating pump boundary dimension; In addition because the mode of water-cooled is taked in mechanical seal, if increase exterior line for water-cooled, so said PCS recirculating pump boundary dimension just more difficulty reduced.
The model utility content
The purpose of the utility model is in order to overcome the deficiency of existing technology; A kind of linkage structure of the PCS of being used for recirculating pump is provided; It makes PCS follow the pump structure compactness again; When guaranteeing PCS recirculating pump reliability, prevent that the boundary dimension of PCS recirculating pump from exceeding the maximum value that nuclear power plant system allows.
A kind of technological scheme that realizes above-mentioned purpose is: a kind of linkage structure of the PCS of being used for recirculating pump comprises: the pump housing, pump cover, impeller, axle sleeve, mechanical seal, bearing support and pump shaft;
The said pump housing is divided into suction chamber and spiral case chamber, and an end of said suction chamber is provided with suction flange, and the other end is with axially being connected with said spiral case chamber through joint, and said spiral case also is provided with outer pipe on the chamber, and the end of said outer pipe is provided with outlet(discharge) flange;
Said impeller places said spiral case indoor, and an end of said impeller is socketed in the end of said pump shaft, the other end and said joint socket;
Said pump cover, said impeller and said mechanical seal are socketed on the said pump shaft successively, and are axial restraints between the said pump housing, said pump cover and the said mechanical seal;
Said pump cover and said mechanical seal and said pump shaft radially between said axle sleeve is set, said axle sleeve, said pump cover and said mechanical seal surround the mechanical seal chamber;
Said bearing support is socketed on the outer wall of said mechanical seal and said pump shaft;
The hierarchic structure of annular is set on the outer wall of said axle sleeve, make said axle sleeve near the section area of said pump cover one side greater than the section area of said axle sleeve near said mechanical seal one side.
Further, said outlet pipe is arranged at the top of said spiral case chamber, and said outlet pipe is perpendicular to the level ground.
Further, on the said pump cover axial hole is set, connects said spiral case chamber and said mechanical seal chamber.
Further, said suction chamber is the straight-tapered suction chamber, and said suction chamber is provided with the section area of said inlet flange one end less than the section area that said joint one end is set.
Further, said spiral case chamber is single volute type spiral case chamber.
Further again, between said impeller and the said pump cover increasing back sealing ring is set, between said impeller and the said joint preceding seal ring is set, between said impeller and the said pump shaft impeller nut is set.
Further, on the outer wall of said bearing support radiated rib is set.
Further, the bottom of said spiral case chamber is provided with the pump pin.
Adopted the technological scheme of the linkage structure of a kind of PCS of being used for recirculating pump of the utility model, be about to original straight-cylindrical axle sleeve and change step-like axle sleeve into.Its technique effect is: when guaranteeing said mechanical seal chamber size; Reduce the size of said pump cover, said bearing support and said mechanical seal; So just can be under the situation that guarantees the stable operation of PCS recirculating pump; Reduce the boundary dimension of PCS recirculating pump, thereby the boundary dimension that prevents the PCS recirculating pump exceeds the maximum value that nuclear power plant system allows.
Description of drawings
Fig. 1 is a kind of axial arrangement schematic representation that is used for the linkage structure of PCS recirculating pump of the utility model.
Embodiment
See also Fig. 1,, 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, the PCS recirculating pump belong to single-stage, horizontal, end is inhaled, the cantilever type centrifugal pump, a kind of linkage structure that is used for the PCS recirculating pump of the utility model comprises: the pump housing 1, pump cover 2, impeller 3, axle sleeve 4, mechanical seal 5, bearing support 6 and pump shaft 7.
The said pump housing 1 is divided into suction chamber 11 and spiral case chamber 12; 11 1 ends of said suction chamber are provided with suction flange 111; The other end is with axially being connected with said spiral case chamber 12 through joint 112; Also be provided with outer pipe 121 on the top of said spiral case chamber 12, said outer pipe 121 is perpendicular to the level ground, and the end of said outer pipe 121 is provided with outlet(discharge) flange 122.
Said impeller 3 places in the said spiral case chamber 12, and an end of said impeller 3 is socketed in the end of said pump shaft 7, the other end and 112 sockets of said joint.
Said pump cover 2, said impeller 3 and said mechanical seal 5 are socketed on the said pump shaft 7 successively, and are axial restraints between the said pump housing 1, said pump cover 2 and the said mechanical seal 5.Thisly fixedly accomplish through bolt.
Said pump cover 2 and said mechanical seal 5 and said pump shaft 7 radially between said axle sleeve 4 is set, said axle sleeve 4, said pump cover 2 and said mechanical seal 5 surround mechanical seal chamber 51;
Said bearing support 6 is socketed on the outer wall of said mechanical seal 5.
Said outlet pipe 121 is placed top, said spiral case chamber; And the purpose that said outlet pipe 121 is perpendicular to the level ground is: water is from axially being inhaled into the said pump housing 1; From the said pump housing 1 of radially vertical discharge; Help to reduce the axial length of the said pump housing 1 like this, thereby control the boundary dimension of said PCS at recycle pump.
In addition, said suction chamber 11 is the suction chamber of straight-tapered, and said suction chamber 11 is provided with the section area of said inlet flange 111 1 ends less than the section area that said joint 112 1 ends are set.The purpose of design is like this: water said suction chamber 11 in from said suction flange 111 when said joint 112 is mobile; The flow velocity of water slows down gradually; Therefore the hydraulic loss of water in said suction chamber 11 is little; And then guarantee that water flows into said impeller 3 with even flow in that said joint 112 1 ends are set, with the efficient that improves the PCS recirculating pump and anti-cavitation performance.This helps controlling the boundary dimension of said PCS recirculating pump equally.
Said spiral case chamber 12 is single volute type spiral case chamber.The purpose of design is like this: the section area that helps to reduce said outlet pipe 121 ends; Reduce the bore of said outlet(discharge) flange 122; Reduce the flow velocity of water at said outlet(discharge) flange 122 places; Reduce the local resistance loss of water, improve the efficient of PCS recirculating pump, think that the boundary dimension of the said PCS recirculating pump of control creates favorable conditions at said outlet(discharge) flange 122 places.Avoid the adapted motor of said PCS recirculating pump to be burnt out simultaneously.
In order further to strengthen the sealing of said spiral case chamber; Guarantee the stable of said impeller 3 rotating centers; Between said impeller 3 and the said pump cover 2 increasing back sealing ring 31 is set; Seal ring 32 before being provided with between said impeller 3 and the said joint 112 is provided with impeller nut 33 between said impeller 3 and the said pump shaft 7.
Also be in order to improve the sealability of said spiral case chamber 12, between said spiral case chamber 12 and said pump cover 2, pad 22 to be set, and to use bolt.
In the present embodiment, said increasing back sealing ring 31 through screw on said pump cover 2, said before seal ring 32 all through screw on the said pump housing 1, between said impeller nut 33 and the said pump shaft 7 pad is set.
The of paramount importance improvement that the utility model is made has three aspects: the one, the hierarchic structure of annular is set on the outer wall of said axle sleeve 4, make said axle sleeve 4 near the section area of said pump cover 2 one sides greater than the section area of said axle sleeve 4 near said mechanical seal 5 one sides.
The purpose of design is like this: when guaranteeing said mechanical seal chamber 51 sizes; Reduce the size of said pump cover 2, mechanical seal 5 and said bearing support 6; So just can be under the situation that guarantees the stable operation of PCS recirculating pump; Reduce the boundary dimension of PCS recirculating pump, thereby the boundary dimension that prevents the PCS recirculating pump exceeds the maximum value that nuclear power plant system allows.
Another important improvement of the linkage structure of a kind of PCS of being used for recirculating pump of the utility model is: on the said pump cover 2 axial hole 21 is set, connects said spiral case chamber 12 and said mechanical seal chamber 51.The purpose of design is like this: directly the water in the spiral case chamber 12 is introduced said mechanical seal chamber 51; Seal face in the said mechanical seal 5 is cooled off and washes; Save exterior line and the cooling chamber on the said pump cover 2 on the said PCS recirculating pump like this, thereby reduced the boundary dimension of said pump cover 2.Thereby help reducing the boundary dimension of said PCS recirculating pump.
The 3rd important improvement of the linkage structure of a kind of PCS of being used for recirculating pump of the utility model is: vent rib 61 is set on the outer wall of said bearing support 6; The purpose of design is like this: the area that can increase said bearing support 6 outer walls like this; When guaranteeing said bearing support 6 heat radiations; Reduce the volume of said bearing support 6, thereby help reducing the boundary dimension of said PCS recirculating pump.
In the utility model,, increased a pump pin 8 in the bottom of said spiral case chamber 12 in order to strengthen the stability of said PCS recirculating pump.Adopt O-ring seals to carry out the fixing of substantially horizontal between said pump pin 8 and the said spiral case 12, adopt screw to carry out the fixing of Vertical direction.The bottom of said bearing support 6 is provided with supporting foot (being demonstration among the figure), and said pump pin 81 and said supporting foot are jointly to said PCS recirculating pump.
On the outer wall of said spiral case chamber 12, also be provided with pipe plug 123, said pipe plug 123 is positioned at said pump pin 8 tops, after said pipe plug 123 is removed, and water emptying that can said spiral case is indoor.
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, to the above embodiment's variation, claims scope that modification all will drop on the utility model
Claims (8)
1. a linkage structure that is used for the PCS recirculating pump comprises: the pump housing (1), pump cover (2), impeller (3), axle sleeve (4), mechanical seal (5), bearing support (6) and pump shaft (7);
The said pump housing (1) is divided into suction chamber (11) and spiral case chamber (12); One end of said suction chamber (11) is provided with suction flange (111); The other end is with axially being connected with said spiral case chamber (12) through joint (112); Also be provided with outer pipe (121) on the said spiral case chamber (12), the end of said outer pipe (121) is provided with outlet(discharge) flange (122);
Said impeller (3) places in the said spiral case chamber (12), and an end of said impeller (3) is socketed in the end of said pump shaft (7), the other end and said joint (112) socket;
Said pump cover (2), said impeller (3) and said mechanical seal (5) are socketed on the said pump shaft (7) successively, and are axial restraints between the said pump housing (1), said pump cover (2) and the said mechanical seal (5);
Said pump cover (2) and said mechanical seal (5) and said pump shaft (7) radially between said axle sleeve (4) is set, said axle sleeve (4), said pump cover (2) and said mechanical seal (5) surround mechanical seal chamber (51);
Said bearing support (6) is socketed on the outer wall of said mechanical seal (5) and said pump shaft (7); It is characterized in that:
The hierarchic structure of annular is set on the outer wall of said axle sleeve (4), make said axle sleeve (4) near the section area of said pump cover (2) one sides greater than the section area of said axle sleeve (4) near said mechanical seal (5) one sides.
2. a kind of linkage structure that is used for the PCS recirculating pump according to claim 1 is characterized in that: said outlet pipe (121) is arranged at the top of said spiral case chamber (12), and said outlet pipe (121) is perpendicular to the level ground.
3. a kind of linkage structure that is used for the PCS recirculating pump according to claim 1 and 2 is characterized in that: axial hole (21) is set on the said pump cover (2), connects said spiral case chamber (12) and said mechanical seal chamber (51).
4. a kind of linkage structure that is used for the PCS recirculating pump according to claim 1 and 2; It is characterized in that: said suction chamber (11) is the straight-tapered suction chamber, and said suction chamber (11) is provided with the section area of said inlet flange (111) one ends less than the section area that said joint (112) one ends are set.
5. a kind of linkage structure that is used for the PCS recirculating pump according to claim 1 and 2 is characterized in that: said spiral case chamber (12) is single volute type spiral case chamber.
6. a kind of linkage structure that is used for the PCS recirculating pump according to claim 5 is characterized in that:
Between said impeller (3) and the said pump cover (2) increasing back sealing ring (31) is set, between said impeller (3) and the said joint (112) preceding seal ring (32) is set, between said impeller (3) and the said pump shaft (7) impeller nut (33) is set.
7. a kind of linkage structure that is used for the PCS recirculating pump according to claim 1 and 2 is characterized in that: radiated rib (61) is set on the outer wall of said bearing support (6).
8. a kind of linkage structure that is used for the PCS recirculating pump according to claim 1 and 2 is characterized in that: the bottom of said spiral case chamber (12) is provided with pump pin (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220118785 CN202597172U (en) | 2012-03-27 | 2012-03-27 | Connecting structure for PCS (passive containment cooling system) recirculation pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220118785 CN202597172U (en) | 2012-03-27 | 2012-03-27 | Connecting structure for PCS (passive containment cooling system) recirculation pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202597172U true CN202597172U (en) | 2012-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220118785 Expired - Lifetime CN202597172U (en) | 2012-03-27 | 2012-03-27 | Connecting structure for PCS (passive containment cooling system) recirculation pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202597172U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606509A (en) * | 2012-03-27 | 2012-07-25 | 上海阿波罗机械股份有限公司 | Connection structure for PCS (Passive Containment Cooling System) recirculation pump |
-
2012
- 2012-03-27 CN CN 201220118785 patent/CN202597172U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102606509A (en) * | 2012-03-27 | 2012-07-25 | 上海阿波罗机械股份有限公司 | Connection structure for PCS (Passive Containment Cooling System) recirculation pump |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |
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| CX01 | Expiry of patent term |