CN203257720U - Axial force balancing structure for main water-feeding pump - Google Patents
Axial force balancing structure for main water-feeding pump Download PDFInfo
- Publication number
- CN203257720U CN203257720U CN 201320181926 CN201320181926U CN203257720U CN 203257720 U CN203257720 U CN 203257720U CN 201320181926 CN201320181926 CN 201320181926 CN 201320181926 U CN201320181926 U CN 201320181926U CN 203257720 U CN203257720 U CN 203257720U
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- CN
- China
- Prior art keywords
- axial force
- balancing drum
- main feed
- balancing
- balance
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Abstract
The utility model discloses an axial force balancing structure for a main water-feeding pump in the field of nuclear power equipment. The axial force balancing structure comprises a rear pump cover, a bearing bracket, a balancing drum, a balancing sleeve and a pump shaft, wherein the bearing bracket is fixed to the rear end face of the rear pump cover, and the pump shaft axially penetrates through the circle center of the rear pump cover and the circle center of the bearing bracket. The balancing drum and the balancing sleeve are located between the rear pump cover and the pump shaft in the radial direction, the balancing drum is connected with the pump shaft in a sleeved mode, the balancing sleeve is connected with the inner periphery of the rear pump cover and the outer periphery of the balancing drum in a sleeved mode, and a balancing cavity is formed among the balancing drum, the balancing sleeve, the rear pump cover and the bearing bracket. A radial depressurization through hole is formed in the top of the rear pump cover, and the depressurization through hole enables the pressure in the balancing cavity to be less than the pressure in a multi-stage pumping chamber, a pressure difference is formed between the two ends of the balancing drum, and therefore axial force borne by the pump shaft is balanced.
Description
Technical field
The utility model relates to a kind of axial force balance structure for main feed pump in nuclear power generating equipment field.
Background technique
Main feed pump is non-nuclear level pump, its major function of main feed pump in pressurized-water reactor nuclear power plant is: the water that comes to oxygen-eliminating device pressurizes, then the water that comes of oxygen-eliminating device enters high-pressure heater and steam generator, makes the steam generator generating steam go to drive the main steam turbine generating of nuclear power station.And in the stage in period of a loop reactor shutdown, what the waste heat in the heap also can make main feed pump gives water generates steam, and the heat of a loop medium is derived, and plays the effect in cooling one loop.Moreover be when the accident conditionses such as the unexpected removal of load of main steam turbine or generating steam pipeline breaking, main feed pump also can play the effect that unnecessary heat is derived.Therefore, the operational reliability of main feed pump is very important.
Because main feed pump moves under high-temperature high-pressure state, therefore the pump shaft of main feed pump is subject to the effect of sizable axial force in the process of operation, but, there are many unreasonable parts in present main feed pump in design, the axial force that causes pump shaft to be subject in running can't be balanced, cause the pump shaft of main feed pump very easily to damage, thereby jeopardize the security of operation of nuclear power station.
The model utility content
The purpose of this utility model is in order to overcome the deficiencies in the prior art, a kind of axial force balance structure for main feed pump to be provided, the axial force that it can the active balance pump shaft be subject in running, thus effectively safeguard the security of operation of nuclear power station.
A kind of technological scheme that realizes above-mentioned purpose is: a kind of axial force balance structure for main feed pump, comprise rear pump cover, bearing bracket, balancing drum, balance set and pump shaft, the ear end face of described bearing bracket and described rear pump cover is fixed, and described pump shaft axially runs through the center of circle of described rear pump cover and described bearing bracket; Described balancing drum is in described rear pump cover radially inner side and the socket of described pump shaft, described balance set be socketed in described rear pump cover and described balancing drum radially between, form a counter balance pocket between described balancing drum, described balance set, described rear pump cover and the described bearing bracket; It is characterized in that:
The top of described rear pump cover is provided with a step-down through hole radially.
Further, described step-down through hole connects the suction chamber of main feed pump by equalizing line.
Further, the inner circumference of described balance set is provided with along the compensating groove of some annulars of described balance set axially-aligned.
Further, the front-end face of described balance set and ear end face are provided with the eddy flow fracture of annular.
Further, also be socketed with the balancing drum inner sleeve on the described pump shaft, the front-end face of described balancing drum is by described balancing drum inner sleeve and described pump shaft shaft shoulder location.
Further, described balancing drum is fastening by the balance nut and the pump shaft that are positioned at described balancing drum inner circumference.
Further, the Brinell hardness of described balance set is less than the Brinell hardness of described balancing drum.
Further, be provided with cooling chamber gland and coolant jacket in the described counter balance pocket, described cooling chamber gland is fixed on the front-end face of described bearing bracket, described coolant jacket is positioned at described cooling chamber gland radially inner side, and fix with the front-end face of described bearing bracket, form cooling chamber between the inner circumference of described cooling chamber gland and the excircle of described coolant jacket.
Further, be provided with the nockbush that is socketed on the described pump shaft between the inner circumference of described coolant jacket and the described pump shaft
Adopt the technological scheme of a kind of axial force balance structure for main feed pump of the utility model, namely increased the technological scheme that a step-down through hole radially reduces the counter balance pocket internal pressure on the top of rear pump cover.Its technique effect is: mineralization pressure is poor at the balancing drum two ends, makes balancing drum be subject to a thrust F who points to counter balance pocket, the stretching that therefore pump shaft also is subject to, thereby balance the axial force that is subject to of described pump shaft.
Description of drawings
Fig. 1 is the structural representation of a kind of axial force balance structure for main feed pump of the present utility model.
Fig. 2 is the structural representation of a kind of axial force balance structure balance set for main feed pump of the present utility model.
Embodiment
See also Fig. 1, inventor of the present utility model be in order to understand the technical solution of the utility model better, below by embodiment particularly, and is described in detail by reference to the accompanying drawings:
Be axially arranged with suction chamber and multistage pumping chamber (not shown) along pump shaft 10 in the pump housing of main feed pump.A kind of axial force balance structure for main feed pump of the present utility model is positioned at the end of described multistage pumping chamber.
A kind of axial force balance structure for main feed pump of the present utility model comprises rear pump cover 1, bearing bracket 2, balancing drum 3, balance set 4 and pump shaft 100.
The front-end face of rear pump cover 1 is fixed on the end of the multistage pumping chamber of main feed pump, and bearing bracket 2 is fixed with the ear end face of rear pump cover 1.Pump shaft 10 axially runs through rear pump cover 1 and bearing bracket 2 centers of circle.Balancing drum 3 is in radially inner side and pump shaft 10 sockets of rear pump cover 1.Balance set 4 is socketed between the excircle of the inner circumference of rear pump cover 1 and balancing drum 3.Balance set 4 and rear pump cover 1 shaft shoulder location, and fixing by bolt and rear pump cover 1.Balancing drum 3 under the drive of pump shaft 10 in balance set 4 interior rotations, thereby become a decompressor.Rear pump cover 1 has formed counter balance pocket 100 between bearing bracket 2, balancing drum 3, balance set 4 and the pump shaft 10.Be provided with radial clearance between balancing drum 3 and the balance set 4, for the multistage pumping chamber inflow counter balance pocket 100 of high-pressure liquid water from main feed pump.
The top of counter balance pocket 100, namely the top of rear pump cover 1 is provided with a step-down through hole 11 radially, and step-down through hole 11 is communicated with counter balance pocket 100 by equalizing line with the suction chamber (not shown) of main feed pump.Counter balance pocket 100 equates with the pressure of described suction chamber.The front-end face of balancing drum 3 is towards the multistage pumping chamber of main feed pump, and the ear end face of balancing drum 3 is towards counter balance pocket 100.Because the pressure in the described suction chamber is less than the pressure in the described multistage pumping chamber, so the pressure in the counter balance pocket 100 is less than the pressure of described multistage pumping chamber end.Balancing drum 3 two ends mineralization pressures are poor, thus balance pump shaft 100 be subject to a thrust F who points to counter balance pocket 100.Step-down through hole 11 is by the purpose that equalizing line connects described suction chamber: reclaim the high-pressure liquid water in the counter balance pocket 100.
In the present embodiment, also be socketed with balancing drum inner sleeve 31 on the pump shaft 10, the front-end face of balancing drum 3 is by balancing drum inner sleeve 31 and pump shaft 10 axial shaft shoulder location.Balancing drum 3 is by key and pump shaft 100 radial locations, and fastening with pump shaft 10 by a balance nut 32 that is positioned on balancing drum 3 inner circumferences.
Simultaneously, the inner circumference of balance set 4 is provided with the compensating groove 41 of some annulars along balance set 4 axially-aligned, be respectively equipped with annular eddy flow fracture 42 on two end faces of balance set 4, this structure has improved the hydrostatic rigidity of main feed pump inner high voltage liquid water, greatly reduce again simultaneously the leakage of main feed pump inner high voltage liquid water, effectively controlled described multistage pumping chamber inner high voltage liquid water stream to the flow of counter balance pocket 100.
Balancing drum 3 is made by the stainless steel forgings material, and the Brinell hardness of balance set 4 is less than the Brinell hardness of balancing drum 3, thereby protection balancing drum 3 does not does not wear and tear in the process of main feed pump operation.
Simultaneously, also be provided with cooling chamber gland 5 and coolant jacket 6 in counter balance pocket 100, cooling chamber gland 5 is fixed on the front-end face of bearing bracket 2, and coolant jacket 6 is positioned at the radially inner side of cooling chamber gland 5, the inner circumference of the excircle of coolant jacket 6 and bearing bracket 2, and the inner circumference of cooling chamber gland 5 is fixed.The front end of cooling chamber gland 5 and coolant jacket 6 is fixing by sleeve nut 7.Form like this a cooling chamber 200 between the excircle of the inner circumference of the front-end face of bearing bracket 2, cooling chamber gland 5 and coolant jacket 6.The effect of cooling chamber 200 is the high-pressure liquid water in the counter balance pocket 100 is cooled off.Simultaneously between coolant jacket 6 and pump shaft 10, also be provided with the nockbush 8 that is socketed on the pump shaft 10, play stable equilibrium chamber 100 internal pressures, and the further effect of the suffered axial force of balance pump shaft 10.
Those of ordinary skill in the art will be appreciated that, above embodiment illustrates the utility model, and be not to be used as restriction of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model the above embodiment's variation, modification.
Claims (9)
1. axial force balance structure that is used for main feed pump, comprise rear pump cover (1), bearing bracket (2), balancing drum (3), balance set (4) and pump shaft (10), described bearing bracket (2) is fixed with the ear end face of described rear pump cover (1), and described pump shaft (10) axially runs through the center of circle of described rear pump cover (1) and described bearing bracket (2); Described balancing drum (3) is in described rear pump cover (1) radially inner side and described pump shaft (10) socket, described balance set (4) be socketed in described rear pump cover (1) and described balancing drum (3) radially between, form a counter balance pocket (100) between described balancing drum (3), described balance set (4), described rear pump cover (1) and the described bearing bracket (2); It is characterized in that:
The top of described counter balance pocket (100) is provided with a step-down through hole (11) radially.
2. a kind of axial force balance structure for main feed pump according to claim 1 is characterized in that: described step-down through hole (11) is on described rear pump cover (1), and described step-down through hole (11) connects the suction chamber of main feed pump by equalizing line.
3. a kind of axial force balance structure for main feed pump according to claim 1 and 2, it is characterized in that: the inner circumference of described balance set (4) is provided with along the compensating groove (41) of some annulars of described balance set (4) axially-aligned.
4. a kind of axial force balance structure for main feed pump according to claim 3 is characterized in that: the front-end face of described balance set (4) and ear end face are provided with the eddy flow fracture (42) of annular.
5. a kind of axial force balance structure for main feed pump according to claim 1 and 2, it is characterized in that: also be socketed with balancing drum inner sleeve (31) on the described pump shaft (10), the front-end face of described balancing drum (3) is by described balancing drum inner sleeve (31) and described pump shaft (10) shaft shoulder location.
6. a kind of axial force balance structure for main feed pump according to claim 1 and 2 is characterized in that: described balancing drum (3) is fastening with described pump shaft (10) by the balance nut (32) that is positioned at described balancing drum (3) inner circumference.
7. a kind of axial force balance structure for main feed pump according to claim 1 and 2, it is characterized in that: the Brinell hardness of described balance set (4) is less than the Brinell hardness of described balancing drum (3).
8. a kind of axial force balance structure for main feed pump according to claim 1 and 2, it is characterized in that: be provided with cooling chamber gland (5) and coolant jacket (6) in the described counter balance pocket (100), described cooling chamber gland (5) is fixed on the front-end face of described bearing bracket (2), described coolant jacket (6) is positioned at described cooling chamber gland (5) radially inner side, and fix with the front-end face of described bearing bracket (2), form cooling chamber (200) between the excircle of the inner circumference of described cooling chamber gland (5) and described coolant jacket (6).
9. a kind of axial force balance structure for main feed pump according to claim 8 is characterized in that: be provided with the nockbush (8) that is socketed on the described pump shaft (10) between the inner circumference of described coolant jacket (6) and the described pump shaft (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320181926 CN203257720U (en) | 2013-04-12 | 2013-04-12 | Axial force balancing structure for main water-feeding pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320181926 CN203257720U (en) | 2013-04-12 | 2013-04-12 | Axial force balancing structure for main water-feeding pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203257720U true CN203257720U (en) | 2013-10-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320181926 Expired - Lifetime CN203257720U (en) | 2013-04-12 | 2013-04-12 | Axial force balancing structure for main water-feeding pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203257720U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107795510A (en) * | 2017-11-24 | 2018-03-13 | 湖州三井低温设备有限公司 | A kind of more grade low-temp immersed pump axial force balance mechanisms |
| CN113757158A (en) * | 2021-08-18 | 2021-12-07 | 合肥新沪屏蔽泵有限公司 | Balance drum structure for multistage shield pump |
-
2013
- 2013-04-12 CN CN 201320181926 patent/CN203257720U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107795510A (en) * | 2017-11-24 | 2018-03-13 | 湖州三井低温设备有限公司 | A kind of more grade low-temp immersed pump axial force balance mechanisms |
| CN107795510B (en) * | 2017-11-24 | 2024-03-22 | 湖州三井低温设备有限公司 | Axial force balance mechanism of multistage low-temperature immersed pump |
| CN113757158A (en) * | 2021-08-18 | 2021-12-07 | 合肥新沪屏蔽泵有限公司 | Balance drum structure for multistage shield pump |
| CN113757158B (en) * | 2021-08-18 | 2023-12-05 | 合肥新沪屏蔽泵有限公司 | Balance drum structure for multistage shielding pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131030 |
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| CX01 | Expiry of patent term |