Fuel motor device suitable for wide-temperature environment

Abstract

The invention belongs to the technical field of motors, and particularly relates to a fuel motor device suitable for a wide-temperature environment. The motor comprises a motor shell, the motor shell comprises a shell body, a front end cover and a rear end cover, the front end cover and the rear end cover are arranged at the two ends of the shell body, and a cavity is defined by the front end cover, the shell body and the rear end cover; the fuel motor device is fixed in the fuel pump through the front end cover and the rear end cover; the rotor assembly comprises a rotor shaft, and the axial shrinkage coefficient of the rotor shaft is smaller than that of the motor shell; a first graphite bearing piece and a second graphite bearing piece are installed at the connecting positions of the front end cover, the shell body and the rear end cover respectively and penetrate through the front end cover, the shell body and the rear end cover in sequence. The first graphite bearing piece is clamped and matched with the rotor shaft and is used for limiting the rotor shaft to move along the axial direction; the outer ring of the second graphite bearing piece is in interference fit with the rear end cover, when the rotor shaft and the motor shell axially contract, the rear end cover can slide in the axial direction of the rotor shaft relative to the rotor shaft, and the problem that the bearing is locked in the low-temperature environment is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a fuel motor device that is adaptable to a wide temperature environment. Background Art

[0002] The fuel motor drives the pump body components (such as impellers, rotors, etc.) inside the fuel pump to rotate by its own rotation, thereby generating a pressure difference, extracting fuel from the fuel tank and delivering it to the engine combustion chamber, providing the engine with the required fuel supply. Fuel motors can be divided into built-in fuel motors and external fuel motors based on differences in structural forms. Built-in fuel motors are usually integrated with the assembly and installed inside the fuel tank. When the fuel motor is running in a low temperature environment (-55℃ and below), the axial contraction coefficient of the motor housing made of aluminum alloy is greater than the axial contraction coefficient of the rotor made of stainless steel. Since the bearing is located between the motor housing and the rotor, when the gap between the bearing and the bearing axial limiter is too small, it will cause the bearing to lock at low temperatures.

[0003] The existing technical means is to set an adjustment gasket between the bearing and the axial limit part of the bearing to adjust the axial movement. However, during shutdown and maintenance, it is necessary to repeatedly disassemble and measure whether the axial clearance meets the requirements. The measurement error generated during the adjustment process may cause the product to not meet the standard requirements.

[0004] Based on this, the present invention provides a fuel motor device that is adaptable to a wide temperature environment to overcome the above-mentioned defects. Summary of the invention

[0005] The first object of the present invention is to provide a fuel motor device that can adapt to a wide temperature environment. Due to the sliding characteristics of the rear end cover relative to the rotor shaft, the fuel motor device effectively solves the bearing locking problem caused by the difference in axial shrinkage coefficient between the motor housing and the rotor shaft in a low temperature environment; it eliminates the need to consider the axial movement of the graphite bearing during design, improves the shutdown maintenance efficiency, and avoids defects caused by measurement errors.

[0006] The present invention adopts the following technical solution: a fuel motor device adapted to a wide temperature environment, the fuel motor device comprising:

[0007] A motor housing, the motor housing comprising a housing body, and a front end cover and a rear end cover arranged at both ends of the housing body, and the front end cover, the housing body and the rear end cover together form a cavity; the fuel motor device is fixed in the fuel pump through the front end cover and the rear end cover;

[0008] A rotor assembly, the rotor assembly comprising a rotor shaft, the axial contraction coefficient of the rotor shaft being smaller than the axial contraction coefficient of the motor housing; the rotor shaft sequentially passes through the front end cover, the housing body and the rear end cover, and a first graphite bearing component and a second graphite bearing component are respectively installed at the connection with the front end cover and the rear end cover; the first graphite bearing component is engaged with the rotor shaft to limit the axial movement of the rotor shaft; the outer ring of the second graphite bearing component is interference-fitted with the rear end cover, and when the rotor shaft and the motor housing are axially contracted, the rear end cover can slide relative to the rotor shaft along the axial direction of the rotor shaft;

[0009] A stator assembly is built into the cavity of the motor housing.

[0010] Furthermore, a receiving groove is formed in the middle of the front end cover;

[0011] An expansion portion is formed along the radial direction of the rotor shaft at a connection between the rotor shaft and the first graphite bearing member;

[0012] The first graphite bearing member is divided into a front graphite bearing and a rear graphite bearing, which are respectively placed at the front and rear sides of the extension portion;

[0013] The rear graphite bearing, the expansion portion and the front graphite bearing are sequentially installed in the receiving groove of the front end cover to achieve the connection between the front end cover and the rotor shaft.

[0014] Furthermore, viewed from a longitudinal section of the rotor shaft, the expansion portion is rectangular.

[0015] Furthermore, a limiting portion is provided at one end of the accommodating groove close to the shell body, and one side of the first graphite bearing component abuts against the limiting portion to limit the range of movement of the first graphite bearing component.

[0016] Furthermore, a mounting cover is provided at the connection between the front end cover and the first graphite bearing component.

[0017] Furthermore, the mounting cover includes a connecting portion and an abutting portion, the connecting portion is fixedly connected to the front end cover, and the abutting portion is inserted and installed between the first graphite bearing component and the inner wall of the boss portion of the front end cover, and is abutted and connected to the other side of the first graphite bearing component.

[0018] Furthermore, impellers are respectively installed at both ends of the rotor shaft, and the impellers are located on the side of the front end cover and the rear end cover away from the casing body.

[0019] Furthermore, the cover body of the front end cover is provided with a first oil groove along its circumference, and the inner wall side of the boss portion of the front end cover is provided with a second oil groove;

[0020] The rear end cover is provided with a first oil hole along its circumference;

[0021] A part of the oil directly enters the motor housing from the first oil groove of the front end cover; the other part of the oil flows into the motor housing through the oil holes of the inner ring and the end face of the front graphite bearing in the first graphite bearing component, the second oil groove of the front end cover, and the oil holes of the end face and the inner ring of the rear graphite bearing in the first graphite bearing component. The oil is transported to the rear end cover through the second oil holes in the circumference of the housing body and the gap between the stator assembly and the rotor assembly. The oil at the rear end cover then flows out of the motor housing through the oil holes of the inner ring of the second graphite bearing component and the first oil holes of the rear end cover, forming a positive heat dissipation oil path.

[0022] The reverse heat dissipation oil circuit is set in the opposite direction.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The fuel motor device of the present invention, which is adaptable to a wide temperature environment, when working in a low temperature environment, places the stator assembly and the rotor assembly in the cavity of the motor housing, and the rotor shaft is rotationally connected with the front end cover and the rear end cover by means of the first graphite bearing component and the second graphite bearing component. At the same time, the rear end cover can slide relative to the rotor shaft along the axial direction of the rotor shaft.

[0025] In the fuel motor device of the present invention, the front end cover mainly plays a fixed supporting role, and the rear end cover and the rotor shaft can slide relative to each other forward and backward, and at the same time, the axial contraction coefficient of the motor housing is required to be greater than the axial contraction coefficient of the rotor shaft. In this way, whether the fuel motor device is in a high temperature or low temperature (-55°C or below) environment, due to the relative sliding characteristics between the rear end cover and the rotor shaft, the bearing locking problem caused by the difference in axial contraction coefficients between the motor housing and the rotor shaft in a low temperature environment is effectively solved.

[0026] At the same time, the relative sliding design between the rear end cover and the rotor shaft avoids the consideration of the axial movement of the bearing, simplifies the structural design, and reduces the complexity. In addition, it significantly improves the efficiency of shutdown maintenance, reduces the time and labor costs caused by repeated disassembly and measurement of axial clearance; it also avoids the situation where the product does not meet the standards due to measurement errors, and improves the stability and reliability of the product.

[0027] 2) By providing an extension at the connection between the rotor shaft and the first graphite bearing, the first graphite bearing is divided into two parts, front and rear, which are respectively located on both sides of the extension, effectively increasing the contact area between the rotor shaft and the graphite bearing. This design enables the first graphite bearing to withstand a greater load during operation, improves the load-bearing capacity of the first graphite bearing, thereby enhancing the stability and reliability of the entire fuel motor device during operation, extending the service life of the fuel motor, and reducing the risk of failure due to insufficient load.

[0028] 3) The limiting part of the front end cover and the abutting part of the mounting cover limit the first graphite bearing component from both sides, effectively preventing it from excessively moving in the axial direction, and enhancing the reliability of the structure. In addition, the split design of the mounting cover and the front end cover and the connection method with the front end cover make the installation process more convenient and improve the assembly efficiency.

[0029] The second object of the present invention is to provide a fuel pump, which includes a fuel pump housing and a fuel motor installed in the fuel pump housing, and the fuel motor is the above-mentioned fuel motor device that is adaptable to a wide temperature environment.

[0030] A third object of the present invention is to provide an aircraft comprising the above-mentioned fuel pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 The structure of a fuel motor device adapted to a wide temperature environment in one embodiment of the present invention is shown in FIG. Figure 1 ;

[0033] Figure 2 The structure of a fuel motor device adapted to a wide temperature environment in one embodiment of the present invention is shown in FIG. Figure 2 ;

[0034] Figure 3 A cross-sectional view of a fuel motor device adapted to a wide temperature environment according to an embodiment of the present invention Figure 1 ;

[0035] Figure 4 A cross-sectional view of a fuel motor device adapted to a wide temperature environment according to an embodiment of the present invention Figure 2 ;

[0036] Figure 5 for Figure 4 Middle partial enlarged picture;

[0037] Figure 6 for Figure 1 Front view;

[0038] Figure 7 for Figure 1 Rear view;

[0039] Figure 8 For Figure 5 Schematic diagram of the local structure after adding a multi-layer sealing structure to the foundation;

[0040] Wherein: motor housing 1, housing body 10, connection port 101, front end cover 11, mounting hole 111, cover body 112, first oil groove 112-1, boss portion 113, second oil groove 113-1, accommodating groove 114, annular groove 115, sealing groove 115-1, limiting portion 116, rear end cover 12, first oil hole 12-1, mounting cover 13, connection portion 131, abutment portion 132, multi-layer sealing structure 14;

[0041] Rotor assembly 2, rotor shaft 20, extension portion 21;

[0042] A second graphite bearing member 3;

[0043] A first graphite bearing component 4 , a front graphite bearing 40 , and a rear graphite bearing 41 . DETAILED DESCRIPTION

[0044] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0045] The following is combined with Figure 1 To Attachment Figure 8 And specific embodiments, the present invention is described in detail:

[0046] like Figures 1 to 8 As shown, the present invention provides a fuel motor device adaptable to a wide temperature environment, comprising: a motor housing 1, a rotor assembly 2 and a stator assembly.

[0047] The motor housing 1 includes a housing body 10, and a front cover 11 and a rear cover 12 arranged at both ends of the housing body 10, and the front cover 11, the housing body 10 and the rear cover 12 enclose a cavity, which is used to accommodate the stator assembly and the rotor assembly 2. The fuel motor device is fixed in the fuel pump through the front cover 11 and the rear cover 12 to achieve the fixed support function of the fuel motor device; as in this embodiment, the front cover 11 and the rear cover 12 are respectively fixed to the two ends of the housing body 10 by screws, and the front cover 11 and the rear cover 12 are provided with mounting holes 111 at the four corners. The screw and nut assembly fixes the front cover 11 and the rear cover 12 in the fuel pump housing through the mounting holes 111, thereby achieving the fixed installation of the fuel motor device in the fuel pump housing. At the same time, in this embodiment, the housing body 10 is provided with a connection port 101, and the connection port 101 is used for wiring.

[0048] The rotor assembly 2 includes a rotor shaft 20 and a rotor body built into the cavity of the motor housing 1. The axial contraction coefficient of the motor housing 1 is required to be greater than the axial contraction coefficient of the rotor shaft 20 so as to meet the requirements of a wide temperature range.

[0049] The rotor shaft 20 passes through the front cover 11, the housing body 10 and the rear cover 12 in sequence, and the first graphite bearing component 4 and the second graphite bearing component 3 are respectively installed at the connection between the rotor shaft 20 and the front cover 11 and the rear cover 12. The first graphite bearing component 4 and the second graphite bearing component 3 support the two ends of the rotor shaft 20 to realize the rotation connection between the rotor shaft 20 and the front cover 11 and the rear cover 12. The first graphite bearing component 4 is engaged with the rotor shaft 20 to limit the axial movement of the rotor shaft 20, that is, the axial movement of the rotor shaft 20 is constrained by the first graphite bearing component 4. The outer ring of the second graphite bearing component 3 is interference-fitted with the rear cover 12, and the inner ring of the second graphite bearing component 3 is clearance-fitted with the rotor shaft 20. When the rotor shaft 20 and the motor housing 1 are contracted along the axial direction of the rotor shaft 20, the rear cover 12 can slide relative to the rotor shaft 20 along the axial direction of the rotor shaft 20.

[0050] It should be noted that when the fuel pump and the motor are in a low temperature environment, the fuel pump housing, the motor housing 1 and the screw nut assembly expand and contract together, and the rear end cover 12 is fixed in the fuel pump housing, and the rear end cover 12 can slide relative to the rotor shaft 20 along the axial direction of the rotor shaft 20.

[0051] The stator assembly is built in the cavity of the motor housing 1. It should be noted that the specific structure of the stator assembly and the rotor body in the rotor assembly 2 is not limited in the present invention, and can be designed by those skilled in the art with reference to existing technologies.

[0052] The fuel motor device of the present invention adapted to a wide temperature environment, when working, places the stator assembly and the rotor assembly 2 in the cavity of the motor housing 1, and the rotor shaft 20 is rotatably connected with the front cover 11 and the rear cover 12 by means of the first graphite bearing member 4 and the second graphite bearing member 3, and the rear cover 12 and the rotor shaft 20 can slide relative to each other. When the winding of the stator assembly is energized, a magnetic field is formed around the iron core of the stator assembly, thereby causing the rotor assembly 2 to rotate.

[0053] In the fuel motor device of the present invention, the front end cover 11 mainly plays a fixing and supporting role, and the rear end cover 12 and the rotor shaft 20 can slide relative to each other. At the same time, the axial contraction coefficient of the motor housing 1 is required to be greater than the axial contraction coefficient of the rotor shaft 20. In this way, whether the fuel motor device is in a high temperature or low temperature (-55°C or below) environment, due to the relative sliding characteristics between the rear end cover 12 and the rotor shaft 20, in a low temperature environment, Figure 3As shown, the rear end cover 12 shrinks in the direction indicated by the arrow, and the rotor shaft 20 shrinks in the direction indicated by the arrow, which effectively solves the bearing locking problem caused by the difference in axial shrinkage coefficients between the motor housing 1 and the rotor shaft 20 in a low temperature environment.

[0054] At the same time, the relative sliding design between the rear end cover 12 and the rotor shaft 20 avoids the consideration of the axial movement of the bearing, simplifies the structural design, and reduces the complexity. In addition, it significantly improves the efficiency of shutdown maintenance, reduces the time and labor costs caused by repeated disassembly and measurement of axial clearance; it also avoids the situation where the product does not meet the standards due to measurement errors, and improves the stability and reliability of the product.

[0055] Furthermore, in a specific embodiment, in order to ensure that the rear end cover 12 and the rotor shaft 20 remain stable and do not tilt when sliding relative to each other forward and backward, and to ensure the smoothness and accuracy of sliding, the rear end cover 12 and the rotor shaft 20 are designed in detail, and the specific design scheme is as follows:

[0056] A spiral groove is provided on the rotor shaft 20 along its axial direction, and correspondingly, a spiral slider is formed on the inner wall side of the rear end cover 12. The spiral groove provides a clear movement path for the spiral slider of the rear end cover 12, guiding the rear end cover 12 to always move along the spiral track when sliding back and forth relative to the rotor shaft 20, effectively preventing the rear end cover 12 from tilting and deflecting, and ensuring that it remains stable during the sliding process. And due to the spiral design, the force applied to the rear end cover 12 during the sliding process is more evenly distributed on the spiral track, avoiding the instability caused by uneven force.

[0057] It should be noted that the spiral angle and pitch of the spiral groove can be designed by those skilled in the art according to the relative sliding speed of the rear end cover 12 and the rotation speed of the rotor shaft 20, and are not specifically limited in the present invention; in practical applications, different equipment may have different working conditions and requirements, and the design of the spiral groove can be adjusted by technicians according to specific circumstances to adapt to various working conditions, thereby improving the versatility and practicality of the design. Similarly, the depth, width, and length of the spiral groove are not specifically limited in the present invention, and can be designed by those skilled in the art according to actual conditions.

[0058] Furthermore, in a specific embodiment, the motor housing 1, the front cover 11 and the rear cover 12 are made of aluminum alloy. Aluminum alloy has good thermal conductivity and light weight. Using aluminum alloy to make the motor housing 1 is beneficial to heat dissipation during motor operation and reduces the overall weight.

[0059] The rotor shaft 20 is made of stainless steel, which has high strength and good corrosion resistance. The use of stainless steel for the rotor shaft 20 can ensure stability and reliability in long-term operation, reduce wear and corrosion, and extend service life.

[0060] And because the axial contraction coefficient of aluminum alloy is greater than that of stainless steel, when the temperature changes, the contraction or expansion amplitude of the motor housing 1 is relatively large, while that of the rotor shaft 20 is relatively small. This difference is combined with the design that the rear end cover 12 can slide back and forth relative to the rotor shaft 20. Specifically, in a low temperature environment, the motor housing 1 made of aluminum alloy contracts along the axial direction of the rotor shaft 20, and the rotor shaft 20 made of stainless steel contracts along its axial direction. The contraction amount of the motor housing 1 is greater than the contraction amount of the rotor shaft 20, so the motor housing 1 can slide along the axial direction of the rotor shaft 20 relative to the rotor shaft 20, thereby adapting to a wide temperature environment and avoiding problems such as structural jamming or damage caused by temperature changes.

[0061] Furthermore, in some specific embodiments, Figure 3 , 4 As shown in FIGS. 5 and 5 , a receiving groove 114 is formed in the middle of the front end cover 11 , and the first graphite bearing member 4 is sleeved and installed on the rotor shaft 20 and inserted into the receiving groove 114 of the front end cover 11 .

[0062] At the connection between the rotor shaft 20 and the first graphite bearing member 4, an expansion portion 211 is formed along the radial direction of the rotor shaft 20. Preferably, the expansion portion 211 and the rotor shaft 20 are an integrally formed structure, which avoids possible weak points at the connection part, improves the overall structural strength and stability, and can better withstand loads and stresses during work; at the same time, the coaxiality of the expansion portion 211 and the rotor shaft 20 is ensured, the imbalance and vibration during rotation are reduced, and the rotation accuracy and the stability of operation are improved.

[0063] The first graphite bearing member 4 is divided into a front graphite bearing 40 and a rear graphite bearing 41, and the front graphite bearing 40 and the rear graphite bearing 41 are respectively arranged at the front and rear sides of the extension part 211. The rear graphite bearing 41, the extension part 211 and the front graphite shaft 40 are sequentially installed in the receiving groove 114 of the front end cover 11, and the connection between the front end cover 114 and the rotor shaft 20 is realized through the cooperation between the rear graphite bearing 41, the extension part 211, the front graphite shaft 40 and the receiving groove 114.

[0064] By providing an extension part 21 at the connection between the rotor shaft 20 and the first graphite bearing part 4, the first graphite bearing part 4 is divided into two parts, the front and rear parts, which are respectively located on both sides of the extension part 21, and the contact area between the rotor shaft 20 and the graphite bearing is effectively increased. This design enables the first graphite bearing part 4 to withstand a greater load during operation, improves the bearing capacity of the first graphite bearing part 4, thereby enhancing the stability and reliability of the entire fuel motor device during operation, extending the service life of the fuel motor, and reducing the risk of failure due to insufficient load.

[0065] More specifically, from the longitudinal section of the rotor shaft 20, as shown in FIG. Figure 6 As shown, the extension part 211 is rectangular, so that the contact surface between the extension part 211 and the first graphite bearing part 4 is a plane. Since the graphite bearing part is a sliding bearing, an oil film will be formed on the contact surface with the extension part 211. If the contact surface is non-planar, the oil film will be easily punctured. The planar contact method can bear the force more evenly, reduce the phenomenon of excessive local pressure, and ensure the stability of the bearing load. At the same time, it avoids the local oil film rupture caused by non-planar contact, reduces the wear on the bearing and the extension part, and extends its service life; it can also reduce the probability of failure caused by oil film puncture, and improve the reliability and stability of the operation of the entire fuel motor device.

[0066] Furthermore, in some specific embodiments, Figure 4 , 5 As shown, in order to facilitate the installation of the first graphite bearing component 4, a mounting cover 13 is provided at the connection between the front end cover 11 and the first graphite bearing component 4, and the front end cover 11 and the mounting cover 13 are both designed in detail. The specific design scheme is as follows:

[0067] The front end cover 11 includes a cover body 112 and a boss portion 113 connected to the cover body 112 .

[0068] The cover portion 112 abuts against the front end surface of the shell body 10 and is fixedly connected to the shell body 10 by fasteners such as screws. The cover portion 112 is in the shape of a hollow disk and an annular groove 115 is formed at the front end surface of the cover portion 112 .

[0069] The boss portion 113 is in a hollow cylindrical shape, and the hollow part of the cover body portion 112 and the boss portion 113 together form a receiving groove 114 for receiving the first graphite bearing component 4, that is, the middle part of the front end cover 11 is formed with a receiving groove 114. The first graphite bearing component 4 is inserted and installed into the receiving groove 114, and a limiting portion 116 is provided at one end of the receiving groove 114 close to the housing body 10, and one side of the first graphite bearing component 4 (that is, at the rear graphite bearing 41) is against the limiting portion 116 to limit the range of motion of the first graphite bearing component 4.

[0070] The mounting cover 13 includes a connecting portion 131 and an abutting portion 132 connected to the connecting portion 131. The connecting portion 131 is abutted and mounted at the annular groove 115 of the cover body 112, and is fixedly connected to the front end cover 11 by fasteners such as screws; the abutting portion 132 is inserted and mounted between the first graphite bearing component 4 and the inner wall of the boss portion 113, and is abutted and connected to the other side of the first graphite bearing component 4 (i.e., the front graphite bearing 40), and plays a limiting role.

[0071] The installation position of the first graphite bearing member 4 can be accurately defined by the receiving groove 114 and the limiting portion 116, ensuring its stability and precision during operation. At the same time, the limiting portion 116 of the front end cover 11 and the abutting portion 132 of the mounting cover 13 limit the first graphite bearing member 4 from both sides, effectively preventing its excessive axial movement and enhancing the reliability of the structure. In addition, the split design of the mounting cover 13 and the front end cover 11 and the connection method with the front end cover 11 make the installation process more convenient and improve the assembly efficiency.

[0072] In a more specific embodiment, the fuel motor device needs to work in a wide temperature range. Temperature changes can cause expansion and contraction of the material. If there is no sealing structure between the front cover 11 and the mounting cover 13, temperature changes may cause a gap in the connection, thereby affecting the sealing performance. Based on this, a multi-layer sealing structure 14 can be added between the front cover 11 and the mounting cover 13, such as Figure 8 The specific technical solution of the multi-layer sealing structure 14 is as follows:

[0073] A sealing groove 115-1 is provided at the annular groove 115 of the front end cover 11. The sealing groove 115-1 is annular, and a multi-layer sealing structure 14 is placed in the sealing groove 115-1. The connecting portion 131 of the mounting cover 13 is abutted against the annular groove 115 of the cover body 112, and squeezes the multi-layer sealing structure 14 to deform, thereby achieving sealing between the mounting cover 13 and the front end cover 11. The connecting portion 131 of the mounting cover 13 squeezes the multi-layer sealing structure to deform, thereby ensuring that the sealing structure fits tightly, is not easy to loosen during the operation of the fuel motor device, and ensures a long-term stable sealing effect.

[0074] The multi-layer sealing structure 14 includes a shape memory layer, a main sealing layer, a spacer layer and an auxiliary sealing layer arranged in sequence, and each layer works in synergy to ensure reliable sealing performance under different working conditions.

[0075] Among them, the shape memory layer is made of alloy or polymer material with shape memory function, which can automatically adjust the shape according to temperature changes and fill possible gaps, further enhancing the reliability of sealing, and is particularly suitable for fuel motors in a wide temperature environment.

[0076] The main sealing layer is made of a high-performance rubber sealing ring, which should have good elasticity, wear resistance, oil resistance and high temperature resistance, and be able to adapt to the working environment of the fuel motor.

[0077] The spacing layer is made of soft elastic material, such as foam rubber or silicone pad, which plays the role of buffering and uniform pressure distribution.

[0078] The auxiliary sealing layer can be made of polytetrafluoroethylene (PTFE) sealing ring or graphite gasket, etc. For example, the PTFE sealing ring has excellent corrosion resistance, low friction coefficient and self-lubrication, and can provide additional sealing protection when a small leakage occurs in the main sealing layer, thereby achieving double guarantee.

[0079] The above-mentioned multi-layer sealing structure 14 provides multiple protections through the synergistic effect of different materials and functional layers, greatly improving the reliability and durability of the seal, that is, whether it is under high pressure, high temperature or wide temperature environment, it can maintain a good sealing effect. At the same time, the fuel motor works under different temperature conditions, from extreme cold to high temperature. The shape memory layer in the multi-layer sealing structure 14 can automatically adjust its shape according to temperature changes, adapt to different temperature ranges, ensure that it still maintains effective sealing in a wide temperature environment, improve the environmental adaptability of the fuel motor device, and expand its application range.

[0080] Furthermore, in some specific embodiments, since the two ends of the rotor shaft 20 extend out of the front cover 11 and the rear cover 12 respectively, corresponding impellers can be installed at the two ends of the rotor shaft 20, and the impellers are located on the side of the front cover 11 and the rear cover 12 away from the shell body 10 to achieve a two-way effect. In some special applications, such as the field of aircraft, it can play a role in different directions (forward flight and inverted flight), thereby improving the adaptability and versatility of the system. Specifically, when the fuel motor device is used in the field of aircraft, the rotor shaft 20 is vertically arranged in the fuel tank of the aircraft, so that one impeller is located at the upper part of the fuel tank and one impeller is located at the lower part of the fuel tank. Then, when the aircraft is in forward flight and inverted flight, only one fuel motor can be used to realize fuel delivery, so that no matter whether the aircraft is in forward flight or inverted flight, fuel delivery can be realized by a single fuel motor, reducing the possible failure points caused by multiple fuel motors and improving the reliability of the system. At the same time, only one fuel motor is used to reduce the volume and weight of the equipment, which is beneficial to the overall design and performance improvement of the aircraft.

[0081] Furthermore, in some specific embodiments, the fuel motor device will generate more heat when working for a long time, and the high-pressure oil at the rear end of the impeller can be used to dissipate the heat. A detailed heat dissipation oil circuit is designed, and the specific design scheme is as follows:

[0082] The cover body 112 of the front end cover 11 is provided with a first oil groove 112 - 1 along its circumference. In this embodiment, four first oil grooves 112 - 1 are arranged at equal intervals. The inner wall side of the boss portion 113 of the front end cover 11 is provided with a second oil groove 113 - 1.

[0083] The rear end cover 12 is provided with first oil holes 12 - 1 along its circumference. In this embodiment, a plurality of first oil holes 12 - 1 are provided and evenly spaced.

[0084] like Figure 4 , 5 As shown, a part of the oil directly enters the motor housing 1 from the first oil groove 112-1 of the front cover 11; the other part of the oil flows into the motor housing 1 through the oil holes of the inner ring and end face of the front graphite bearing 40 in the first graphite bearing member 4, the second oil groove 113-1 of the front cover 11, and the oil holes of the end face and inner ring of the rear graphite bearing 41 in the first graphite bearing member 4. The oil is transported to the rear cover 12 through the second oil hole in the circumference of the housing body 10 and the gap between the stator assembly and the rotor assembly 2. The oil at the rear cover 12 then flows out of the motor housing 1 through the oil hole in the inner ring of the second graphite bearing member 3 and the first oil hole 12-1 of the rear cover 12, forming a positive heat dissipation oil path (the red line indicates the direction of the oil). In this embodiment, the oil is high-pressure oil; when the impeller of the fuel pump rotates, the fuel behind the impeller is high-pressure oil, and the oil pressure is high, and the high-pressure oil will actively flow into the motor structure.

[0085] The reverse heat dissipation oil circuit is set in the opposite way and will not be described here. By designing a detailed heat dissipation oil circuit, the heat generated by the motor during operation can be effectively taken away, ensuring that the temperature of the motor is within the appropriate range when working for a long time, and extending the service life and reliability of the motor. At the same time, good heat dissipation helps to reduce deformation, aging and other problems caused by overheating of internal components of the motor, and improves the service life of the components. In addition, high-pressure oil is used for heat dissipation. The high-pressure oil provides the power and pressure for flow, allowing it to flow along the designed oil path, thereby taking away the heat generated by the motor and achieving a heat dissipation effect. No additional heat dissipation equipment is required, saving space and cost.

[0086] It should be noted that in this embodiment, the fuel motor device is used in the field of aircraft, and uses the high-pressure oil at the rear end of the aircraft fuel pump impeller for heat dissipation, and uses the high-pressure oil at the rear end of the aircraft fuel pump impeller for heat dissipation, without the need for additional heat dissipation equipment, saving space and cost. And when the aircraft is flying forward and backward, forward and reverse heat dissipation oil paths are formed respectively, ensuring that good heat dissipation effects can be achieved in different flight attitudes, and enhancing the stability of the motor under various working conditions.

[0087] Based on the above-mentioned fuel motor device adapted to a wide temperature environment, the present invention further provides a fuel pump, which includes a fuel pump housing and a fuel motor installed in the fuel pump housing, wherein the fuel motor is the above-mentioned fuel motor device adapted to a wide temperature environment; the fuel motor provides power for the operation of the fuel pump. The fuel motor has at least all the technical solutions of the above-mentioned fuel motor device adapted to a wide temperature environment, and at least all the advantages of the above-mentioned fuel motor device adapted to a wide temperature environment, which will not be described in detail here.

[0088] Based on the above-mentioned fuel pump, the present invention further provides an aircraft, including the above-mentioned fuel pump. The aircraft at least has all the technical solutions of the above-mentioned fuel motor device adapted to a wide temperature environment, at least has all the advantages of the above-mentioned fuel motor device adapted to a wide temperature environment, which will not be described in detail here.

[0089] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in the field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A fuel motor device adapted to a wide temperature environment, characterized in that: The fuel motor device comprises: A motor housing, the motor housing comprising a housing body, and a front end cover and a rear end cover arranged at both ends of the housing body, and the front end cover, the housing body and the rear end cover together form a cavity; the fuel motor device is fixed in the fuel pump through the front end cover and the rear end cover; A rotor assembly, the rotor assembly comprising a rotor shaft, the axial contraction coefficient of the rotor shaft being smaller than the axial contraction coefficient of the motor housing; the rotor shaft sequentially passes through the front end cover, the housing body and the rear end cover, and a first graphite bearing component and a second graphite bearing component are respectively installed at the connection with the front end cover and the rear end cover; the first graphite bearing component is engaged with the rotor shaft to limit the axial movement of the rotor shaft; the outer ring of the second graphite bearing component is interference-fitted with the rear end cover, and when the rotor shaft and the motor housing are axially contracted, the rear end cover can slide relative to the rotor shaft along the axial direction of the rotor shaft; A stator assembly is built into the cavity of the motor housing.

2. The fuel motor device adapted to a wide temperature environment according to claim 1, characterized in that: A receiving groove is formed in the middle of the front end cover; An expansion portion is formed along the radial direction of the rotor shaft at a connection between the rotor shaft and the first graphite bearing member; The first graphite bearing member is divided into a front graphite bearing and a rear graphite bearing, which are respectively placed at the front and rear sides of the extension portion; The rear graphite bearing, the expansion portion and the front graphite bearing are sequentially installed in the receiving groove of the front end cover to achieve the connection between the front end cover and the rotor shaft.

3. The fuel motor device adapted to a wide temperature environment according to claim 2, characterized in that: When viewed from a longitudinal section of the rotor shaft, the expansion portion is rectangular.

4. The fuel motor device adapted to a wide temperature environment according to claim 2, characterized in that: A limiting portion is provided at one end of the accommodating groove close to the shell body, and one side of the first graphite bearing component abuts against the limiting portion to limit the range of movement of the first graphite bearing component.

5. The fuel motor device adapted to a wide temperature environment according to claim 4, characterized in that: A mounting cover is provided at the connection between the front end cover and the first graphite bearing component.

6. The fuel motor device adapted to a wide temperature environment according to claim 5, characterized in that: The mounting cover includes a connecting portion and an abutting portion, wherein the connecting portion is fixedly connected to the front end cover, and the abutting portion is inserted and installed between the first graphite bearing component and the inner wall of the boss portion of the front end cover, and is abutted and connected to the other side of the first graphite bearing component.

7. The fuel motor device adapted to a wide temperature environment according to claim 1, characterized in that: Impellers are respectively installed at both ends of the rotor shaft, and the impellers are located on the side of the front end cover and the rear end cover away from the shell body.

8. The fuel motor device adapted to a wide temperature environment according to any one of claims 1 to 7, characterized in that: The cover body of the front end cover is provided with a first oil groove along its circumference, and the inner wall side of the boss portion of the front end cover is provided with a second oil groove; The rear end cover is provided with a first oil hole along its circumference; A part of the oil directly enters the motor housing from the first oil groove of the front end cover; the other part of the oil flows into the motor housing through the oil holes of the inner ring and the end face of the front graphite bearing in the first graphite bearing component, the second oil groove of the front end cover, and the oil holes of the end face and the inner ring of the rear graphite bearing in the first graphite bearing component. The oil is transported to the rear end cover through the second oil holes in the circumference of the housing body and the gap between the stator assembly and the rotor assembly. The oil at the rear end cover then flows out of the motor housing through the oil holes of the inner ring of the second graphite bearing component and the first oil holes of the rear end cover, forming a positive heat dissipation oil path. The reverse heat dissipation oil circuit is set in the opposite direction.

9. A fuel pump, characterized in that: It comprises a fuel pump housing and a fuel motor installed in the fuel pump housing, wherein the fuel motor is a fuel motor device adapted to a wide temperature environment as described in any one of claims 1 to 8.

10. An aircraft, characterized in that: Includes the fuel pump as claimed in claim 9.

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