CN111927784A - Two-stage centrifugal pump structure - Google Patents
Two-stage centrifugal pump structure Download PDFInfo
- Publication number
- CN111927784A CN111927784A CN202010759229.9A CN202010759229A CN111927784A CN 111927784 A CN111927784 A CN 111927784A CN 202010759229 A CN202010759229 A CN 202010759229A CN 111927784 A CN111927784 A CN 111927784A
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- Prior art keywords
- pump
- stage
- cavity
- flow passage
- flow
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/46—Feeding propellants using pumps
Abstract
The invention discloses a two-stage centrifugal pump structure, which comprises a pump shell and a fuel channel; a first-stage pump cavity and a second-stage pump cavity are arranged in the pump shell; a first-stage pump wheel is arranged in the first-stage pump cavity, and a second-stage pump wheel is arranged in the second-stage pump cavity; the fuel channel is arranged in the pump shell and comprises a first flow channel, an annular liquid collecting cavity and a second flow channel; the inlet of the first flow passage is communicated with the primary pump cavity, and the outlet of the first flow passage is communicated with the annular liquid collecting cavity; the inlet of the second flow passage is communicated with the annular liquid collecting cavity, and the outlet of the second flow passage is communicated with the secondary pump cavity. According to the pump with the two-stage centrifugal pump structure, the fuel channel is arranged in the pump, part of fuel in the primary pump cavity is introduced into the secondary pump cavity through the fuel channel, and the secondary pump wheel rotates to carry out pressurization, so that the fuel in the secondary pump cavity is output from the secondary outlet, the purpose of single secondary output is achieved, and the size of the whole centrifugal pump is ensured to meet the current use requirement.
Description
Technical Field
The invention relates to the field of fluid machinery centrifugal pumps, in particular to a two-stage centrifugal pump structure.
Background
The centrifugal pump is a general machine, has various types, and is widely applied to the fields of farmland irrigation, petrochemical industry, ship industry, rocket engines and the like. In some fields, such as rocket engines, in order to meet the use requirements of the system, the fuel pump usually adopts a two-stage pump structure, and the primary pump and the secondary pump are required to output fuel independently.
The two-stage pump structure at present realizes that the mode of second grade output is: the high-pressure fuel generated in the primary pump cavity is normally output through the outlet pipe of the primary pump through the primary pump wheel, the outlet pipe of the primary pump is provided with a channel, the channel is communicated with the secondary pump cavity through an external pipeline, so that part of the fuel enters the secondary pump cavity, and then the fuel is output through the outlet pipe of the secondary pump through the secondary pump wheel in the secondary pump cavity. However, in the rocket engine field, for some application scenarios with strict limitation on installation space of the centrifugal pump, the size of the centrifugal pump is required to be as small as possible, and the form of the external lead-out pipeline cannot meet the use requirement.
Disclosure of Invention
The invention provides a two-stage centrifugal pump structure, aiming at solving the problems that the two-stage centrifugal pump is limited by installation space in a use scene of a rocket engine and the existing two-stage independent fuel output mode cannot meet the requirements.
The technical scheme of the invention is as follows:
the invention provides a two-stage centrifugal pump structure, which comprises a pump shell and a fuel channel; a first-stage pump cavity and a second-stage pump cavity are arranged in the pump shell; a first-stage pump wheel is arranged in the first-stage pump cavity, and a second-stage pump wheel is arranged in the second-stage pump cavity;
the fuel channel is arranged in the pump shell and comprises a first flow channel, an annular liquid collecting cavity and a second flow channel;
the inlet of the first flow passage is communicated with the primary pump cavity, and the outlet of the first flow passage is communicated with the annular liquid collecting cavity;
the inlet of the second flow passage is communicated with the annular liquid collecting cavity, and the outlet of the second flow passage is communicated with the secondary pump cavity.
Further, above-mentioned pump casing is split type, including the fixed one-level pump casing and the second grade pump casing of butt joint of head and the tail, first flow passage is seted up in the one-level pump casing, and the second flow passage is seted up in the second grade pump casing.
Further, the annular liquid collecting cavity is positioned in the primary pump shell or the secondary pump shell.
Furthermore, the annular liquid collecting cavity is formed by butting a first annular groove and a second annular groove, and the first annular groove and the second annular groove are respectively arranged on the butting surfaces of the primary pump shell and the secondary pump shell.
Furthermore, the first flow channel is provided with a plurality of first flow channels along the circumferential direction; the second flow passage is opened in the pump housing along the circumferential direction.
Further, the first flow passage is obliquely arranged, so that fuel can smoothly flow into the annular liquid collecting cavity from the first-stage pump cavity.
Further, in order to make the second flow passage set up in position more rationally, ensure that the fuel flow is smooth and easy simultaneously, the second flow passage includes horizontal segment, crooked changeover portion and the vertical section that sets gradually along the fuel flow direction.
The invention has the beneficial effects that:
according to the pump with the two-stage centrifugal pump structure, the fuel channel is arranged in the pump, part of fuel in the primary pump cavity is introduced into the secondary pump cavity through the fuel channel, and the secondary pump wheel rotates to carry out pressurization, so that the fuel in the secondary pump cavity is output from the secondary outlet, the purpose of single secondary output is achieved, and the size of the whole centrifugal pump is ensured to meet the current use requirement.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The reference numbers are as follows:
the pump comprises a pump shell 1, a pump shell 11, a pump shell 12, a pump shell 13, a pump shell 14, a pump shell 15 and a pump shell 16.
2-fuel channel, 21-first flow channel, 22-annular liquid collecting cavity, 221 first annular groove, 222-second annular groove and 23-second flow channel;
3-a first-level outlet and 4-a second-level outlet.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The basic design idea of the two-stage centrifugal pump structure provided by the invention is as follows:
referring to fig. 1, including a pump housing 1 and a fuel passage 2; a primary pump cavity 11 and a secondary pump cavity 12 are arranged in the pump shell 1; a first-stage pump wheel 13 is arranged in the first-stage pump cavity 11, and a second-stage pump wheel 14 is arranged in the second-stage pump cavity 12;
the fuel channel 2 is arranged in the pump shell 1 and comprises a first flow channel 21, an annular liquid collecting cavity 22 and a second flow channel 23;
the inlet of the first flow passage 21 is communicated with the first-stage pump chamber 11, and the outlet of the first flow passage 21 is communicated with the annular liquid collecting chamber 22;
the inlet of the second flow passage 23 communicates with the annular sump chamber 22, and the outlet of the second flow passage 22 communicates with the secondary pumping chamber 12.
The working principle is as follows: first, under the rotation action of the primary pump impeller 13, high-pressure fuel is generated in the primary pump chamber 11, a part of the high-pressure fuel is output from the primary outlet 3, and the other part of the high-pressure fuel reaches the annular liquid collecting chamber 22 through the first flow passage 21, is merged by the annular liquid collecting chamber 22, flows into the secondary pump chamber 12 through the second flow passage 23, and is output through the secondary outlet 4 under the pressurization action of the rotation of the secondary pump impeller 14.
On the basis of the basic design thought, the invention also provides two specific implementation structures:
example 1
Referring to fig. 1, the pump housing 1 is a split type, and includes a first-stage pump housing 15 and a second-stage pump housing 16 which are fixedly connected end to end, a first flow channel 21 is provided in the first-stage pump housing 15, a second flow channel 23 is provided in the second-stage pump housing 16, and an annular liquid collection cavity 22 is provided in the first-stage pump housing 15 or the second-stage pump housing 16. With this structure, the primary pump housing 15 and the secondary pump housing 16 need to be formed into the annular liquid collection chamber 22 by casting or 3D printing.
Example 2
Referring to fig. 1, the pump housing 1 is a split type, and includes a first-stage pump housing 15 and a second-stage pump housing 16 which are fixedly butted end to end, the first flow channel 21 is arranged in the first-stage pump housing 15, the second flow channel 23 is arranged in the second-stage pump housing 16, the annular liquid collection chamber 22 is formed by butting a first annular groove 221 and a second annular groove 222, the first annular groove 221 and the second annular groove 222 are respectively arranged on the butting surfaces of the first-stage pump housing 15 and the second-stage pump housing 16, and the annular liquid collection chamber 22 can be formed by machining.
In the two embodiments, the number of the first flow passages 21 and the second flow passages 23 is determined according to the fuel flow entering the primary pump chamber and the spatial layout position, and a plurality of the first flow passages and the second flow passages may be provided. In order to ensure that the inlet of the secondary pump flows uniformly and reduce the radial force of a product during working, the number n of the first flow channel and the second flow channel is more than or equal to 2. In the case of permissible spatial arrangement, it is to be ensured that the first flow channel and the second flow channel are each distributed uniformly over the circumference, i.e. the first flow channel and the second flow channel are each distributed uniformly over the circumference
n1θ1＝360，n,2θ2＝360
n1-the number of annular channels (1);
n2-the number of annular channels (2);
θ1-the angle between two adjacent holes of the annular channel (1) in the circumferential direction;
θ2-the angle between the annular channel (2) and the adjacent holes in the circumferential direction.
In addition, in order to make the fuel flow smoothly in each flow passage, the first flow passage is provided obliquely in the above two embodiments in order to make the fuel flow smoothly from the primary pump chamber into the annular liquid collection chamber.
In order to make the position of the second flow passage more reasonable and ensure smooth fuel flow, the second flow passage comprises a horizontal section, a curved transition section and a vertical section which are arranged in sequence along the fuel flow direction in the two embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A two-stage centrifugal pump structure is characterized in that:
comprising a pump housing (1) and a fuel channel (2); a primary pump cavity (11) and a secondary pump cavity (12) are arranged in the pump shell (1); a first-stage pump wheel (13) is arranged in the first-stage pump cavity (11), and a second-stage pump wheel (14) is arranged in the second-stage pump cavity (12);
the fuel channel (2) is arranged in the pump shell (1) and comprises a first flow channel (21), an annular liquid collecting cavity (22) and a second flow channel (23);
the inlet of the first flow passage (21) is communicated with the primary pump cavity (11), and the outlet of the first flow passage (21) is communicated with the annular liquid collecting cavity (22);
the inlet of the second flow passage (23) is communicated with the annular liquid collecting cavity (22), and the outlet of the second flow passage (23) is communicated with the secondary pump cavity (12).
2. The two-stage centrifugal pump structure of claim 1, wherein: the pump shell (1) is split type and comprises a first-stage pump shell (15) and a second-stage pump shell (16) which are fixedly butted end to end, a first flow channel (21) is arranged in the first-stage pump shell (15), and a second flow channel (23) is arranged in the second-stage pump shell (16).
3. The two-stage centrifugal pump structure of claim 2, wherein: the annular liquid collection cavity (22) is positioned in the primary pump shell (15) or the secondary pump shell (16).
4. The two-stage centrifugal pump structure of claim 2, wherein: the annular liquid collecting cavity (22) is formed by butting a first annular groove (221) and a second annular groove (222), and the first annular groove (221) and the second annular groove (222) are respectively arranged on the butting faces of the primary pump shell (15) and the secondary pump shell (16).
5. The two-stage centrifugal pump structure of claim 1, wherein: the first flow channel (21) is provided with a plurality of first flow channels along the circumferential direction on the pump shell (1); the second flow passage (23) is opened in a plurality of pieces in the pump housing (1) in the circumferential direction.
6. The two-stage centrifugal pump structure of any one of claims 1 to 5, wherein: the first flow passage (21) is obliquely arranged.
7. The two-stage centrifugal pump structure of claim 6, wherein: the second flow passage (23) includes a horizontal section, a curved transition section, and a vertical section which are sequentially arranged along the fuel flow direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010759229.9A CN111927784A (en) | 2020-07-31 | 2020-07-31 | Two-stage centrifugal pump structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010759229.9A CN111927784A (en) | 2020-07-31 | 2020-07-31 | Two-stage centrifugal pump structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111927784A true CN111927784A (en) | 2020-11-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010759229.9A Pending CN111927784A (en) | 2020-07-31 | 2020-07-31 | Two-stage centrifugal pump structure |
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| CN (1) | CN111927784A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6346720Y2 (en) * | 1981-09-30 | 1988-12-02 | ||
| CN201090516Y (en) * | 2007-07-20 | 2008-07-23 | 倪先明 | Middle opening single suction multilevel diffuser centrifugal pump |
| CN201148980Y (en) * | 2007-12-07 | 2008-11-12 | 倪先明 | Barrel body type single-suction multilevel impeller symmetrical diffuser-type centrifugal pump |
| CN102062103A (en) * | 2009-11-17 | 2011-05-18 | 上海连成（集团）有限公司 | Horizontal multi-outlet multistage pump |
| CN202250886U (en) * | 2011-09-26 | 2012-05-30 | 大连深蓝泵业有限公司 | Dual-drum self-balancing sectional type multi-stage pump |
| CN203230633U (en) * | 2013-04-18 | 2013-10-09 | 江苏双达工程技术研究中心有限公司 | Forward and reverse water flow diverter for self-balancing multistage centrifugal pump |
| CN204458366U (en) * | 2015-01-27 | 2015-07-08 | 中国海洋石油总公司 | Horizontal single suction sectional multistage double-vent centrifugal pump |
| CN209856041U (en) * | 2019-04-12 | 2019-12-27 | 丹东克隆先锋泵业有限公司 | Double-drive two-stage magnetic pump |
| CN210423043U (en) * | 2019-05-28 | 2020-04-28 | 浙江青霄科技股份有限公司 | Multi-stage multi-outlet centrifugal pump |
-
2020
- 2020-07-31 CN CN202010759229.9A patent/CN111927784A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6346720Y2 (en) * | 1981-09-30 | 1988-12-02 | ||
| CN201090516Y (en) * | 2007-07-20 | 2008-07-23 | 倪先明 | Middle opening single suction multilevel diffuser centrifugal pump |
| CN201148980Y (en) * | 2007-12-07 | 2008-11-12 | 倪先明 | Barrel body type single-suction multilevel impeller symmetrical diffuser-type centrifugal pump |
| CN102062103A (en) * | 2009-11-17 | 2011-05-18 | 上海连成（集团）有限公司 | Horizontal multi-outlet multistage pump |
| CN202250886U (en) * | 2011-09-26 | 2012-05-30 | 大连深蓝泵业有限公司 | Dual-drum self-balancing sectional type multi-stage pump |
| CN203230633U (en) * | 2013-04-18 | 2013-10-09 | 江苏双达工程技术研究中心有限公司 | Forward and reverse water flow diverter for self-balancing multistage centrifugal pump |
| CN204458366U (en) * | 2015-01-27 | 2015-07-08 | 中国海洋石油总公司 | Horizontal single suction sectional multistage double-vent centrifugal pump |
| CN209856041U (en) * | 2019-04-12 | 2019-12-27 | 丹东克隆先锋泵业有限公司 | Double-drive two-stage magnetic pump |
| CN210423043U (en) * | 2019-05-28 | 2020-04-28 | 浙江青霄科技股份有限公司 | Multi-stage multi-outlet centrifugal pump |
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| PB01 | Publication | ||
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Application publication date: 20201113 |
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| RJ01 | Rejection of invention patent application after publication |