A centrifugal pump with low gravity fueling flow resistance

Abstract

The utility model belongs to the field of aviation fuel system oil delivery centrifugal pump design, disclose a kind of low gravity refueling flow resistance's centrifugal pump, the impeller of centrifugal pump is arranged below oil inlet, medium after being pressurized by impeller flows to centrifugal pump oil outlet by diffusion disc and diffusion disc cover;Annular bypass oil passage is also provided between centrifugal pump oil inlet and centrifugal pump oil outlet on the shell of centrifugal pump, unidirectional valve based on gravity is provided on bypass oil passage.The utility model simple structure, high reliability, product light weight, small, using annular sheet perfect replacement typical unidirectional valve assembly structure complex, high failure rate problem, but the valve plate closing needs to rely on impeller outlet hydraulic pressure, therefore only applicable to centrifugal pump industry.

Description

Technical Field

[0001] This utility model belongs to the field of aviation fuel system centrifugal pump design, and relates to a simple one-way valve plate structure design used in the gravity refueling channel structure of a centrifugal pump, specifically a centrifugal pump with low gravity refueling flow resistance. Background Technology

[0002] When the fuel system's fuel pump fails (is not in operation), gravity refueling is activated. Fuel flows to the main tank by gravity. Its core purpose is to ensure the redundancy and safety of the fuel system. However, due to limitations in flow rate and altitude, it is typically used as a backup refueling method. When a conventional fuel pump is not in operation, the flow resistance from the pump inlet to the outlet is often significant due to insufficient flow cross-sectional area. This results in a very limited amount of fuel that can flow into the main tank by gravity in an emergency.

[0003] Currently, the most widely used solution is to install a one-way valve in an additional flow channel. However, a typical one-way valve has a complex structure with many parts. The springs on the one-way valve often have a high failure rate due to repeated stress, and there is also a certain risk of leakage in the sealing of the one-way valve. Summary of the Invention

[0004] The purpose of this invention is to improve the efficiency of gravity refueling by adding a fuel flow channel at the fuel pump inlet, and to propose a simple and highly reliable one-way valve structure. The one-way valve structure can open the flow channel when the fuel pump is not working, and automatically close the flow channel when it is working.

[0005] Technical effects of this utility model: A centrifugal pump with low gravity-induced flow resistance is provided. The impeller of the centrifugal pump is located below the oil inlet. The medium pressurized by the impeller flows through the diffuser and the diffuser cover to the oil outlet of the centrifugal pump. On the casing of the centrifugal pump, an annular bypass oil passage is provided between the oil inlet and the oil outlet of the centrifugal pump. The bypass oil passage is equipped with a gravity-based one-way valve.

[0006] Furthermore, the gravity-based one-way valve is specifically a valve plate, which is a ring-shaped thin sheet. The valve plate can move up and down within the bypass oil passage. When the valve plate moves to the upper limit position, it blocks the ring-shaped oil passage of the bypass oil passage.

[0007] Furthermore, the centrifugal pump is driven by an electric motor, which is located below the centrifugal pump.

[0008] Furthermore, the oil inlet of the centrifugal pump is located on the uppermost side of the casing, the oil inlet of the centrifugal pump is located inside the bottom of the oil tank, and the other structures of the centrifugal pump are located below the oil tank.

[0009] Furthermore, the annular inlet diameter of the bypass oil passage is smaller than the annular outlet diameter.

[0010] Furthermore, the bypass oil passage is located radially outside the impeller cavity, diffuser disk, and diffuser disk cover.

[0011] The technical effects of this utility model are as follows: This utility model has a simple structure, high reliability, light weight and small size. It uses an annular thin plate to perfectly replace the problems of complex structure and high failure rate of typical one-way valve components. However, the valve plate needs to rely on the hydraulic pressure at the impeller outlet when it is closed, so it is only suitable for the centrifugal pump industry. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a simplified structural implementation diagram of an embodiment of the present invention for reducing the flow resistance of a centrifugal pump for gravity-assisted refueling.

[0014] Figure 2 This is a schematic diagram of a valve plate, a core component of this utility model, used to reduce the flow resistance of a centrifugal pump under gravity refueling.

[0015] Among them, 1—diffuser plate, 2—diffuser plate cover, 3—oil inlet, 4—impeller, 5—valve plate, and 6—shell. Detailed Implementation

[0016] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are given in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0018] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can refer to mechanical connections or point connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] Example 1: A centrifugal pump with low gravity-induced flow resistance is provided. The impeller 4 of the centrifugal pump is located below the oil inlet 3. The medium pressurized by the impeller 4 flows to the oil outlet of the centrifugal pump through the diffuser 1 and the diffuser cover 2. On the casing 6 of the centrifugal pump, an annular bypass oil passage is provided between the oil inlet and the oil outlet of the centrifugal pump. The bypass oil passage is equipped with a gravity-based one-way valve.

[0020] The gravity-based one-way valve is specifically a valve plate 5, which is a ring-shaped thin sheet. The valve plate 5 can move up and down within the bypass oil passage. When the valve plate 5 moves to the upper limit position, it blocks the ring-shaped oil passage of the bypass oil passage.

[0021] The centrifugal pump is driven by an electric motor, which is located below the centrifugal pump.

[0022] The oil inlet of the centrifugal pump is located on the uppermost side of the casing 6, the oil inlet of the centrifugal pump is located inside the bottom of the oil tank, and the other structures of the centrifugal pump are located below the oil tank.

[0023] The diameter of the annular inlet of the bypass oil passage is smaller than the diameter of the annular outlet.

[0024] The bypass oil passage is located radially outside the impeller cavity, diffuser 1, and diffuser cover 2.

[0025] Example 2: The components include: diffuser 1, diffuser cover 2, oil inlet 3, impeller 4, valve plate 5, and housing 6.

[0026] refer to Figure 1 A simple structure for reducing the flow resistance of a centrifugal pump during gravity refueling includes: a diffuser plate 1, a diffuser plate cover 2, an oil inlet 3, an impeller 4, a valve plate 5, and a housing 6. When the pump is operating, the one-way valve automatically closes under pressure, allowing fuel to be drawn in and compressed only through the impeller. When the pump is not operating, the one-way valve opens, allowing fuel to be drawn out through the oil passage at the pump inlet and the impeller channel, thus reducing fuel flow resistance and ensuring smooth fuel system operation and normal engine function.

[0027] In this utility model, only the valve plate 1 plays a major role; the rest of the structure serves as a support framework for the centrifugal pump. Its working principle cleverly utilizes the high-pressure liquid at the centrifugal pump outlet. During operation, it pushes the valve plate to close the flow channel; when not in operation, it opens. Compared to previous unidirectional valve assembly structures, this design significantly simplifies the structure and improves product reliability.

[0028] The oil pump inlet has a flow channel that leads into the vortex cavity of the housing. A valve plate is installed at the end of the flow channel. The opening and closing of the valve plate is adjusted by the working status of the centrifugal pump to meet the needs of gravity refueling when the aviation fuel pump is not working and closing when it is working.

[0029] The one-way valve structure is integrated with the pump body structure, which greatly simplifies the complexity of the product structure and improves the reliability of the one-way valve structure.

[0030] The integrated design of the valve structure significantly reduces the product's size and weight.

[0031] The main component of this invention is the door panel, which has a very simple structure and a clever working principle, thus requiring very low design and processing requirements for subsequent parts.

[0032] The above description is merely a specific embodiment of the present invention, providing a detailed description of the invention. Parts not covered herein are conventional techniques. However, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A centrifugal pump with low gravity-driven refueling flow resistance, characterized in that, The impeller (4) of the centrifugal pump is located below the oil inlet (3). The medium pressurized by the impeller (4) flows to the oil outlet of the centrifugal pump through the diffuser (1) and the diffuser cover (2). On the casing (6) of the centrifugal pump, there is also an annular bypass oil passage between the oil inlet and the oil outlet of the centrifugal pump. A gravity-based one-way valve is provided on the bypass oil passage.

2. The centrifugal pump with low gravity refueling flow resistance according to claim 1, characterized in that, The gravity-based one-way valve is specifically a valve plate (5). The valve plate (5) is a ring-shaped thin sheet. The valve plate (5) can move up and down in the bypass oil passage. When the valve plate (5) moves to the upper limit position, the valve plate (5) blocks the ring-shaped oil passage of the bypass oil passage.

3. A centrifugal pump with low gravity refueling flow resistance according to claim 1, characterized in that, The centrifugal pump is driven by an electric motor, which is located below the centrifugal pump.

4. A centrifugal pump with low gravity-driven refueling flow resistance according to claim 1, characterized in that, The oil inlet of the centrifugal pump is located on the uppermost side of the casing (6), the oil inlet of the centrifugal pump is located inside the bottom of the oil tank, and the other structures of the centrifugal pump are located below the oil tank.

5. A centrifugal pump with low gravity-driven refueling flow resistance according to claim 1, characterized in that, The diameter of the annular inlet of the bypass oil passage is smaller than the diameter of the annular outlet.

6. A centrifugal pump with low gravity-driven refueling flow resistance according to claim 1, characterized in that, The bypass oil passage is located on the radial outer side of the impeller cavity, diffuser (1) and diffuser cover (2).

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