CN203348094U - Low-cavitation erosion first-stage double suction type radiation feeding pump - Google Patents
Low-cavitation erosion first-stage double suction type radiation feeding pump Download PDFInfo
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- CN203348094U CN203348094U CN 201320434235 CN201320434235U CN203348094U CN 203348094 U CN203348094 U CN 203348094U CN 201320434235 CN201320434235 CN 201320434235 CN 201320434235 U CN201320434235 U CN 201320434235U CN 203348094 U CN203348094 U CN 203348094U
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Abstract
The utility model discloses a low-cavitation erosion first-stage double suction type radiation feeding pump, which comprises a pump barrel body (4), a pump cover (16), a casing component and a rotor component, wherein a first-stage suction volute chamber (6) of the casing component and a first-stage impeller (5) of the rotor component are both in a double suction type structure, and first-stage suction shaft sleeves (3) are arranged on a pump shaft (1) of the rotor component and on two sides of the first-stage impeller. According to the radiation feeding pump disclosed by the utility model, a medium can enter the first-stage impeller through two sides of a suction chamber of the volute chamber, then the medium enters a transitional section of the volute chamber after being subjected to energy conversion by the first-stage impeller, the medium is transited to a secondary impeller, the inlet area of the first-stage impeller is increased because of the double suction structure of the first-stage impeller, so flow of the medium passing by each side of the first-stage impeller is reduced, accordingly the relative flow speed of liquid at the inlet of the first-stage impeller is reduced, the pressure drop coefficient of the fluid which passes through the head of a guide vane is reduced, the anti-cavitation erosion capability of the radiation feeding pump is improved, and the safety performance is improved.
Description
Technical field
The utility model relates to a kind of centrifugal pump, particularly relates to a kind of delayed coking unit that is mainly used in oil refining process, also can be applicable to chemical industry and carries the multistage centrifugal pump that does not contain the High Temperature High Pressure hazardous chemical of solid particle.
Background technique
Delayed coking is a kind of oil secondary operations technology, and it is one of main method of current world residual oil deep processing, and its Processing capacity accounts for 1/3rd of residual oil Processing capacity.The radiation feed pump is called again the coking furnace feed pump, is one of key equipment of all-radiant furnace charging in delayed coking unit.At present, the fed sheet of a media temperature in delayed coking unit (sometimes reaches as high as 450 ℃) usually between 320～400 ℃, and the flow of this matching requirements radiation feed pump is at 320～440m
3/ h, pump behaviour pressure is in the situation that 3.5～5.0MPa, and when pump driving machine rotating speed is 2980r/min, radiation feed pump cavitation does not often reach its requirement (it is 4.1～5.2m that its net positive suction head NPSHr requires).
Because the waterpower first stage impeller of existing radiation feed pump inside and chopped-off head suck the conventional construction that volute chamber all adopts the single suction design, very not outstanding to the pump anti-cavitation performance, the area of passage less of single-suction first stage impeller, the velocity of medium that enters first stage impeller under same motor speed can be too fast, thereby make pump that cavitation more easily occur, when delayed coking unit is larger to the traffic requirement of radiation feed pump, the net positive suction head that pump should possess can't reach this matching requirements again, stable, Safety performance is high.
Summary of the invention
The purpose of this utility model is to overcome above deficiency, and provide, a kind of cavitation is low, reliably low cavitation first-stage double-absorption formula radiation feed pump operates steadily.
The purpose of this utility model realizes by following technical solution: low cavitation first-stage double-absorption formula radiation feed pump, comprise that pump is simplified, pump cover, frame set, rotor assembly, bearing unit, mechanical sealing assembly, the first stage impeller that the chopped-off head of described frame set sucks volute chamber, rotor assembly is the double-sucking type structure, on the pump shaft of described rotor assembly and at the dual-side of this first stage impeller, chopped-off head is housed and sucks axle sleeve.
After adopting the utility model structure, because chopped-off head sucks volute chamber and first stage impeller has adopted the double suction structure, medium enters first stage impeller from the suction chamber both sides of this suction volute chamber, then enter by medium after the transformation of energy of first stage impeller the changeover portion that sucks volute chamber, medium is transitioned into to secondary impeller, in above conversion process of energy, the double suction structure of first stage impeller has been equivalent to increase the inlet area of first stage impeller, MEDIA FLOW is reduced through the flow of each side of first stage impeller, thereby reduce the relative velocity of first stage impeller inlet liquid and the pressure-drop coefficient of fluid process guide vane head, improved the anti-cavitation ability of radiation feed pump, promoted its Safety performance.
The accompanying drawing explanation
Below in conjunction with drawings and the embodiments, the utility model is described in further detail.
The structural representation that Fig. 1 is the low cavitation first-stage double-absorption formula radiation feed pump of the present invention.
Fig. 2 is that the first stage impeller in Fig. 1 sucks the partial enlarged drawing of volute chamber at chopped-off head.
Embodiment
With reference to Fig. 1, Fig. 2 is known, the utility model hangs down cavitation first-stage double-absorption formula radiation feed pump, comprise pump barrel body 4, pump cover 16, frame set, rotor assembly, bearing unit 17, mechanical sealing assembly 18, the chopped-off head of described frame set sucks volute chamber 6, it (is that first stage impeller is the integrated of two of single suction impeller left and right that the first stage impeller 5 of rotor assembly is the double-sucking type structure, it is also two of corresponding left and right that chopped-off head sucks volute chamber), on the pump shaft 1 of described rotor assembly, and at the dual-side of this first stage impeller 5, chopped-off head suction axle sleeve 3 (side that sucks axle sleeve at chopped-off head is used locking nut 2 to be fixed on pump shaft 1) is housed.Suck on volute chamber 6 and at chopped-off head and suck between volute chamber 6 and first stage impeller 5 both sides and locate to be equipped with volute chamber seal ring 19 (for two of left and right) at described chopped-off head, to increase its sealing.
Wherein: frame set sucks volute chamber 6, stage casing 8, final stage stage casing 11, stator 9 and final stage stator 10 by connected successively chopped-off head and forms, this frame set is pressed abd fixed in pump barrel body 4 (for the double shell formula, it shows frame set overcoat last layer pump barrel body and forms two tube structures) by pump cover 16.Rotor assembly is comprised of first stage impeller 5, secondary impeller 7 (several), pump shaft 1, balancing drum 12, balancing drum gland 15 etc., several secondary impellers 7 adopt the hot charging form to be enclosed within on pump shaft 1, each is located separately, and balancing drum 12 is fixed on pump shaft 1 by pressure ring 13, minute half snap ring 14 use balancing drum glands 15.First stage impeller does not need to refill joins stator.Rotor assembly is supported and is made the pump smooth running by bearing unit.
With reference to Fig. 2, described first stage impeller 5 both sides have been designed chopped-off head and have been sucked axle sleeve 3, can make the smooth first stage impeller 5 that enters into reposefully of fed sheet of a media, improve the steady flow condition of first stage impeller 5 import media.This kind of design can effectively prevent that medium from entering uneven the flowing of medium that first stage impeller 5 causes, thereby makes the inlet side flowing state of the first stage impeller sinuous flow of can not wadding a quilt with cotton moving, improved the anti-cavitation performance of this radiation feed pump.
The utility model is designed to the double-sucking type structure by chopped-off head suction part (comprising that chopped-off head sucks volute chamber 6, first stage impeller 5), come optimized medium to enter the optimal flow state of first stage impeller, reduce the relative velocity of first stage impeller inlet liquid and the pressure-drop coefficient of each guide vane head of fluid process, can effectively improve the cavitation performance of radiation feed pump.
The utility model is carried the large special pump of High Temperature High Pressure hazardous chemical as the special environment of danger, it is the low cavitation first-stage double-absorption formula radiation feed pump that a kind of cavitation is low, stable, Safety performance is high, very important to whole delayed coking unit system, it has wide popularizing application prospect and the huge market space.
Described net positive suction head (NPSHr) refers to the cavitation parameter that the regulation pump will reach, and its implication is the degree of vacuum (inhaling journey, the setting height(from bottom) that pump allows) that pump allows the imbibition body.Inhale journey=standard atmospheric pressure (10.33)-NPSHr-safe clearance (0.5 meter).Therefore, net positive suction head NPSHr is less, and pump suction journey is just higher, and the anti-cavitation performance of pump is just better.
Claims (2)
1. hang down cavitation first-stage double-absorption formula radiation feed pump, comprise pump barrel body (4), pump cover (16), frame set, rotor assembly, bearing unit (17), mechanical sealing assembly (18), it is characterized in that: the first stage impeller (5) that the chopped-off head of described frame set sucks volute chamber (6), rotor assembly is the double-sucking type structure, upper and at the dual-side of this first stage impeller (5), chopped-off head is housed and sucks axle sleeve (3) at the pump shaft (1) of described rotor assembly.
2. low cavitation first-stage double-absorption formula radiation feed pump as claimed in claim 1, is characterized in that: in a side of described chopped-off head suction axle sleeve (3), use locking nut (2) to be fixed on pump shaft (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320434235 CN203348094U (en) | 2013-07-12 | 2013-07-12 | Low-cavitation erosion first-stage double suction type radiation feeding pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320434235 CN203348094U (en) | 2013-07-12 | 2013-07-12 | Low-cavitation erosion first-stage double suction type radiation feeding pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203348094U true CN203348094U (en) | 2013-12-18 |
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ID=49748002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320434235 Expired - Lifetime CN203348094U (en) | 2013-07-12 | 2013-07-12 | Low-cavitation erosion first-stage double suction type radiation feeding pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203348094U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116378970A (en) * | 2023-05-16 | 2023-07-04 | 利欧集团浙江泵业有限公司 | Switching pump capable of switching flow and lift state |
-
2013
- 2013-07-12 CN CN 201320434235 patent/CN203348094U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116378970A (en) * | 2023-05-16 | 2023-07-04 | 利欧集团浙江泵业有限公司 | Switching pump capable of switching flow and lift state |
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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: 20131218 |
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| CX01 | Expiry of patent term |