Impeller of fuel booster pump

Abstract

The fuel oil booster pump impeller comprises a front cover plate, a rear cover plate and a plurality of blades, a hub is installed in the center area of the rear cover plate, and the two ends of the hub are open, are of a hollow structure and are used for installing a fuel oil booster pump rotating shaft; a plurality of blades are arranged in the peripheral direction of the hub and on the top surface of the rear cover plate at intervals according to the clockwise or anticlockwise rotation direction by taking the convex surfaces of the blades as reference; a hole is formed in the center area of the top face of the front cover plate and used for installing the opening ring, the part from the outer ring face of the bottom of the opening ring to the edge of the front cover plate is arranged in a cambered surface mode, and the opening ring is used for installing the front cover plate; an inlet liquid flow angle beta 1 of each blade is selected within the range of 27-30 degrees, and an outlet liquid flow angle beta 2 of each blade is selected within the range of 41-45 degrees, so that the cavitation performance and efficiency of the fuel booster pump are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fuel booster pumps, and particularly relates to a fuel booster pump. BACKGROUND

[0002] As an important power element in an aircraft fuel system, the main function of a fuel booster pump is to pressurize and deliver fuel in an aircraft fuel tank, and the main component for realizing this function is an impeller in the fuel booster pump. Due to increasingly stringent operating conditions of current aircrafts, fuel booster pumps tend to be miniaturized and high-speed and high-altitude. Miniaturization leads to difficulty in pressurizing the fuel booster pump impeller, low efficiency, and difficulty in design and processing, and especially in a high-speed and high-altitude environment, the fuel booster pump impeller is prone to cavitation, which leads to performance degradation.

[0003] A traditional pump impeller design method is a "velocity coefficient method", which is mainly aimed at a water pump impeller, the volume of which is more than twice that of a fuel booster pump impeller, and the oil delivery efficiency is low, but direct application of the method to the fuel booster pump impeller cannot completely adapt, and to solve the cavitation problem of the fuel booster pump impeller, the current mainstream method is to add a front inducer before the impeller, but the overall power consumption is large.

[0004] In summary, the structure of the existing blade reduces the performance of the fuel booster pump. SUMMARY

[0005] The fuel booster pump impeller provided by the application solves the technical problem that the existing blade structure reduces the efficiency and cavitation performance of the fuel booster pump. The technical solution of the application has many technical advantages, which are described below: A fuel booster pump impeller includes a front cover plate, a rear cover plate, and a plurality of blades, wherein the central region of the rear cover plate is provided with a hub, the hub is open at both ends and is provided in a hollow structure for mounting a rotating shaft of the fuel booster pump, and the plurality of blades are arranged and disposed in a clockwise or counterclockwise rotation direction on the top surface of the rear cover plate and spaced apart from each other based on the blade convex surface. The top surface of the front cover plate is provided with a hole in the central region for mounting a ring, and the outer ring surface of the bottom of the ring to the edge of the front cover plate is provided with an arc surface. The inlet flow angle β1 of the blade is selected in the range of 27° to 30°, and the outlet flow angle β2 is in the range of 41° to 45°.

[0006] Compared with the prior art, the technical solution provided by the application has the following advantages: The cylindrical straight blade with double circular curve blade profile selects the super large value of the inlet flow angle β1 and the outlet flow angle β2, for example, the inlet flow angle β1 of the blade is selected in the range of 27°-30°, and the outlet flow angle β2 is in the range of 41°-45°, which solves the problems of low efficiency and low blade pressure increasing capacity of the fuel booster pump impeller under the requirement of miniaturization, and simultaneously solves the problems of poor cavitation erosion resistance of the fuel booster pump impeller under the requirement of high speed and high cavitation, and the problems of high power consumption and high processing cost after adding the front guide wheel. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0008] Figure 1 is a schematic diagram of the overall structure after combination; Figure 2 is a cross-sectional view of the impeller, Figure 3 is an axial projection view of the blade, Figure 4 is a plan view of the blade profile; Figure 5 is a schematic view of the blade, wherein, 1, front cover plate; 2, rear cover plate; 3, blade; 4, inlet edge; 5, outlet edge; 6, working surface; 7, back surface; 8, blade profile; 9, ring. DETAILED DESCRIPTION

[0009] The embodiments of the present application will be described below through specific concrete examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure of the present specification. Obviously, the described embodiments are only some of the embodiments of the present application, not all. The present application can also be implemented or applied by other different specific embodiments, and each detail in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0010] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0011] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0012] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that aspects can be practiced without these specific details. To enable those skilled in the art to better understand the invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise stated, "a plurality of" means two or more.

[0013] like Figures 1 to 5 The impeller of the fuel booster pump shown is traditionally selected based on experience, with the inlet flow angle β1 and outlet flow angle β2 ranging from 18° to 26° and 26° to 40°, respectively. When the aircraft is at high speed and high altitude, small fuel booster pumps are prone to cavitation. Under rated fuel consumption, the output power of the fuel booster pump not only does not increase but actually decreases, resulting in reduced efficiency. The core of this invention aims to solve this problem. It includes a front cover plate 1, a rear cover plate 2, and multiple blades 3. A hub is installed in the central area of ​​the rear cover plate 2. The hub is open at both ends and has a hollow structure for mounting the fuel booster pump shaft. Multiple blades 3 are arranged in an orderly and spaced manner on the outer circumference of the hub and on the top surface of the rear cover plate 2, with the convex surface of the blades 3 as the reference, in a clockwise or counterclockwise rotation direction. The top surface of the front cover plate 1 is centrally bored for mounting the mouth ring 9, and the outer surface of the bottom of the mouth ring 9 to the edge of the front cover plate 1 is arc-shaped, or the bottom surface of the front cover plate 1 is arc-shaped, and the center of the arc faces away from the rear cover plate 2. The mouth ring 9 has the following functions: 1. sealing (for the fuel supercharger pump); 2. the smaller the gap between the mouth rings, the better the supercharging performance and efficiency. Core design: the inlet flow angle β1 of the blade 3 is selected within the range of 27°-30°, and the outlet flow angle β2 is within the range of 41°-45°. Preferably, the blade 3 is a cylindrical straight blade 3, which, according to the blade 3 design standard, includes an inlet edge 4, an outlet edge 5, a working surface 6, and a back surface 7. The working surface 6 and the back surface 7 are formed by stretching the blade 3 profile composed of a double-arc curve after equidistant offset. Therefore, by selecting the inlet flow angle β1 and the outlet flow angle β2 of the cylindrical straight blade 3 with a double-arc curve blade 3 profile, the problems of low efficiency and low blade 3 supercharging capacity of the fuel supercharger pump under miniaturization requirements can be solved. At the same time, under high-speed and high-altitude environments, the problems of poor cavitation erosion resistance of the fuel supercharger pump impeller and high processing cost after adding a front inducer can be solved, and the cavitation erosion resistance of the small or micro fuel supercharger pump is improved.

[0014] Further, the inlet edge 4 is a line segment parallel to the fuel supercharger pump impeller axis, and the position of the inlet edge 4 is determined by the intersection point of the inlet edge 4 and the front cover plate 1. Usually, the intersection point is consistent with the starting position of the arc segment of the front cover plate 1, at which time the cavitation erosion resistance of the fuel supercharger pump impeller is optimal. At the same time, when the size of the fuel supercharger pump impeller is too small, to avoid serious impeller inlet flow extrusion, the intersection point can also be located on the arc segment of the front cover plate 1, but it should be as close to the starting point of the arc segment as possible, because the farther the intersection point is from the starting point of the arc segment of the front cover plate 1, the worse the cavitation erosion resistance of the fuel supercharger pump impeller.

[0015] The outlet edge 5 is a line segment parallel to the fuel supercharger pump impeller axis, and the position of the outlet edge 5 is consistent with the outlet diameter D2 of the fuel supercharger pump impeller. The working surface 6 and the back surface 7 are formed by offsetting the blade profile 8. The offset distance is determined according to the working pressure of the blade. In order to better resist cavitation erosion of the fuel supercharger pump impeller, the inlet edge 4 position of the blade back surface 7 can be polished to make the blade inlet edge 4 as thin as possible.

[0016] The blade profile 8 is composed of two circular arc curves, the curvatures R1 and R2 of the two circular arc curves are mainly controlled by the inlet flow angle β1 and the outlet flow angle β2, and the connection of the two circular arc curves is tangent transition, so as to ensure the smoothness of the blade profile. The traditional experience inlet flow angle β1 and the outlet flow angle β2 are respectively in the range of 18°-26° and 26°-40°, and in the application, the value of the inlet flow angle β1 is selected in the range of 27°-30°, and the value of the outlet flow angle β2 is selected in the range of 41°-45°, so as to significantly improve the anti-cavitation performance of the impeller on the basis of slight decrease of the efficiency of the fuel supercharging pump impeller.

[0017] In an embodiment, the axial length of the hub is greater than the sum of the thickness of the front cover plate, the rear cover plate and the height of the blade, so as to facilitate the installation of the whole in the fuel supercharging pump, preferably, the front cover plate 1, the rear cover plate 2 and the blade 3 are integrally arranged, for example, are made by additive process.

[0018] In an embodiment, the profile of the blade 3 is composed of the double circular arc curves of the curvatures R1 and R2, and the curvatures R1 and R2 are not equal, so as to improve the anti-cavitation performance of the small or micro fuel supercharging pump.

[0019] In an embodiment, in order to further improve the anti-cavitation performance of the small or micro fuel supercharging pump, the front cover plate 1 is omitted, and the values of the inlet flow angle β1 and the outlet flow angle β2 are the angles corresponding to the maximum difference between the curvatures R1 and R2, the design of the single angle can maximize the anti-cavitation performance, but the processing difficulty is increased compared with the traditional structure, and in the high-speed and high-cavitation environment, the energy consumption of the fuel supercharging pump is proportional to the output function, so that the use performance of the fuel supercharging pump can be effectively improved.

[0020] In summary, on the basis of the traditional impeller design method, the cylindrical straight blade formed by the blade profile 8 composed of the double circular arc curves is adopted, the super-large values of the inlet flow angle β1 and the outlet flow angle β2 are selected, and the starting position of the blade inlet edge 4 is as close as possible to the starting point of the circular arc segment of the front cover plate 1. On this basis, the fuel supercharging pump impeller has the characteristics of high supercharging, high efficiency and high anti-cavitation performance, and better effects can be achieved when the fuel supercharging pump impeller is applied to the micro fuel supercharging pump impeller with high anti-cavitation performance requirement.

[0021] The product provided by the application is described in detail. The principle and implementation mode of the application are described by applying specific examples. The above description of the embodiments is only used to help understand the core idea of the application. It should be pointed out that, for ordinary skilled in the art, without departing from the principle of the application, some improvements and modifications can be made to the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. A fuel booster pump impeller, characterized by, The cover plate comprises a front cover plate, a rear cover plate and a plurality of vanes, wherein, The rear cover plate is provided with a hub at the central region, the hub is open at both ends and provided in a hollow structure for mounting the rotating shaft of the fuel booster pump; the hub is arranged in a plurality of vanes in a circumferential direction and in a clockwise or counterclockwise rotation direction on the top surface of the rear cover plate with the vane convex surface as a reference; The top surface of the front cover plate is provided with a hole in the central region for mounting a ring, and the outer surface of the bottom of the ring is provided with an arc surface to the edge of the front cover plate. The inlet flow angle β1 of the vane is selected in the range of 27°-30°, and the outlet flow angle β2 is selected in the range of 41°-45°.

2. The fuel booster pump impeller according to claim 1, characterized in that The axial length of the hub is greater than the sum of the thickness of the front cover plate and the rear cover plate and the height of the vane.

3. The fuel booster pump impeller according to claim 1, wherein The front cover plate, the rear cover plate and the vane are provided in an integrated structure.

4. The fuel booster pump impeller of claim 1 wherein, The vane is a cylindrical straight vane, comprising an inlet edge, an outlet edge, a working surface and a back surface, wherein, The working surface and the back surface are formed by isometrically offsetting a vane profile composed of a double circular arc curve and then stretching.

5. The fuel booster pump impeller according to claim 4, wherein The profile of the vane is composed of a double circular arc curve with curvature R1 and curvature R2, and the curvature R1 is not equal to the curvature R2.

6. The fuel booster pump impeller according to claim 5, wherein The front cover plate is omitted, and the values of the inlet flow angle β1 and the outlet flow angle β2 are the angles corresponding to the maximum difference between the curvature R1 and the curvature R2.

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