Fuel pump leakage detection system and method

Abstract

This invention relates to the field of fuel pump testing technology, specifically to a fuel pump leak detection system and method. The fuel pump leak detection system includes a fuel pump assembly and a detection assembly. The fuel pump assembly internally comprises a first chamber and a second chamber. The fuel pump assembly includes a sealing unit. The detection assembly includes a coil unit and a control unit. The coil units are spaced apart on the side of the sealing unit near the second chamber, and each coil unit includes an insulator, a first cable, and a second cable. The insulator includes a body, a first channel, a second channel, and a third channel. The third channel passes sequentially through the body, the second channel, and the first channel. The first channel covers the outer periphery of the first cable, and the second channel covers the outer periphery of the second cable. One end of the first cable is electrically connected to the control unit, and one end of the second cable is electrically connected to the control unit. This solves the problem of how to detect leaks at the sealing end face of the fuel pump.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel pump detection, and in particular to a fuel pump leakage detection system and method. Background Art

[0002] The electric fuel pump is the core component of the aviation fuel supply system. It is mainly used to continuously suck the fuel from the fuel tank and provide the fuel system with fuel at a specified pressure and flow rate. The electric fuel pump adopts a modular design. The control module, drive motor and actuator are connected by flanges. The entire fuel pump module is inserted into the fuel tank housing for installation. Its components are immersed in oil, which makes it easy for the fuel pump to dissipate heat and has the advantages of low working noise and long service life. The flange of the electric control module of the electric fuel pump and the fuel tank housing are in a static seal structure. Static seal refers to a seal type without relative movement between the sealing coupling surfaces. Its structural design is crucial to the working efficiency of the electric fuel pump. Due to the complex airborne environment, under the influence of multiple factors such as high temperature, vibration, corrosion and pressure changes, the static seal end face may leak or penetrate slightly. This failure form is difficult to detect. If it is not detected and repaired in time, it may endanger the normal operation of the electric fuel pump and even cause an accident. At present, the devices and methods for leakage detection are mainly concentrated in the field of oil and gas pipelines. According to their working principles, they can be divided into direct method and indirect method. The direct method detects and locates leaks by detecting the fluid parameters outside the pipeline, while the indirect method relies on the changes in the performance parameters of the fluid inside the pipeline to detect leaks. For example, non-contact infrared thermal imaging detection technology uses the thermal radiation emitted by an object and locates the leak point based on the difference in thermal images; sound-based leak detection technology uses sound wave sensors to collect the sound fluctuations generated in the pipeline to determine whether there is a leak; active detection methods, such as using a tracer gas mass spectrometer to detect leaks.

[0003] All of the above methods need to be used in specific environments and conditions. In addition, the detection method based on instantaneous flow locates the leakage point by identifying the principle of sudden change or attenuation of pipeline pressure signal, which is easily interfered by noise. For the leakage detection method of the sealing end face, such as the bubble detection method, by applying a foaming agent on the sealing end face, and then observing whether bubbles are generated, it is judged whether there is a leak; the gas pressure detection method is to fill a certain pressure of nitrogen at the seal. When a leak occurs, the pressure of the nitrogen will drop, so that the leak can be detected. Due to the limitations of the environment, installation space requirements and detection accuracy, the above methods are not suitable for the detection of tiny leaks on the static sealing end face. Therefore, it is necessary to propose a micro-leakage detection method for an aviation electric fuel pump to ensure the accuracy and real-time detection of tiny leaks, and at the same time be suitable for static sealing installation structures in confined spaces to avoid adding excessive weight loads. Summary of the invention

[0004] In order to solve the problem of how to detect the leakage of the sealing end face of a fuel pump, the present invention provides a fuel pump leakage detection system and method, comprising:

[0005] In a first aspect, the present invention provides a fuel pump leakage detection system, the fuel pump leakage detection system comprising:

[0006] A fuel pump assembly, wherein a first chamber and a second chamber are arranged inside the fuel pump assembly; the pressure of the first chamber is greater than the pressure of the second chamber; the fuel pump assembly comprises a sealing unit; the sealing unit blocks the oil in the first chamber from flowing into the second chamber;

[0007] A detection component, the detection component includes a coil unit and a control unit; the coil unit is arranged at intervals on a side of the sealing unit close to the second chamber; the coil unit includes an insulator, a first cable, and a second cable; the insulator includes a body, a first channel, a second channel, and a third channel; the body is in an open ring shape; the first channel penetrates from one end of the body to the other end; the second channel penetrates from one end of the body to the other end; the first channel and the second channel are arranged at intervals; one end of the second channel extends toward the other end along the length direction of the first channel and is arranged on the circumference of the first channel; the third channel passes through the body, the second channel, and the first channel in sequence; a plurality of the third channels are arranged at intervals in the body; the first channel is covered on the outer circumference of the first cable; the second channel is covered on the outer circumference of the second cable; one end of the first cable is electrically connected to the control unit; one end of the second cable is electrically connected to the control unit.

[0008] In some embodiments, the fuel pump assembly also includes a shell unit, a pressurizing unit, and a motor unit; a hollow chamber is formed inside the shell unit; one end of the pressurizing unit is detachably connected to the inner wall of the shell unit, and the other end is detachably connected to the motor unit; the peripheral side of the pressurizing unit close to one end of the motor unit abuts against the inner wall of the shell unit; one end of the motor unit away from the pressurizing unit is detachably connected to the inner wall of the shell unit; the internal chamber of the pressurizing unit serves as the first chamber; the outside of the motor unit and the inner wall of the shell unit surround to form the second chamber.

[0009] In some embodiments, the sealing unit includes a sealing ring and a sealing groove; the sealing groove is arranged on the peripheral side of the pressurizing unit close to one end of the motor unit; the sealing groove is recessed in a direction away from the outer shell unit; the inner peripheral side of the sealing ring abuts against the sealing groove, and its outer peripheral side abuts against the inner wall of the outer shell unit.

[0010] In some embodiments, the detection component also includes a coil groove; the coil unit is arranged in the coil groove; the coil groove is spaced apart and arranged on the side of the sealing groove close to the motor unit; the inner peripheral side of the coil unit abuts against the sealing groove, and the outer peripheral side abuts against the inner wall of the shell unit; 1mm≤A≤2mm, wherein A is the spacing distance between the coil groove and the sealing groove.

[0011] In some embodiments, 1 mm≤B≤2 mm; wherein B is the diameter of the first cable.

[0012] In some embodiments, 1 mm≤C≤2 mm; wherein C is the diameter of the second cable.

[0013] In some embodiments, 0.5*B≤D1≤1.5*B, 0.5*B≤D2≤1.5*B, 0.5*C≤D3≤1.5*C; wherein D1 is the spacing distance between the first cable and the adjacent second cable, D2 is the spacing distance between two adjacent first cables, and D3 is the spacing distance between two adjacent second cables.

[0014] In some embodiments, 0.1 mm ≤ E1, 0.1 mm ≤ E2; wherein E1 is the spacing distance between the outer contour edge of the insulator and the first cable; and E2 is the spacing distance between the outer contour edge of the insulator and the second cable.

[0015] In a second aspect, the present invention provides a fuel pump leakage detection method, which is applied to any of the fuel pump leakage detection systems in the first aspect, and the fuel pump leakage detection method comprises:

[0016] Step S10, obtaining an initial resistance value of the coil unit before the coil unit is installed in the coil slot;

[0017] Step S20, detecting a resistance value fluctuation of the coil unit based on the initial resistance value of the coil unit and a fuel pump leakage detection requirement; wherein the resistance value fluctuation includes a difference between the initial resistance value and the current resistance value of the coil unit;

[0018] Step S30, obtaining a short-circuit position of the coil unit based on the resistance value fluctuation of the coil unit being greater than or equal to a leakage threshold;

[0019] Step S40: based on the short-circuit position of the coil unit, the oil leakage position of the sealing unit is obtained and a leakage alarm is issued.

[0020] In some embodiments, the fuel pump leakage detection method further includes:

[0021] Step S31, based on the resistance fluctuation of the coil unit being less than a leakage threshold, the control unit increases the voltage value in the coil unit;

[0022] Step S32: detecting fluctuation in resistance of the coil unit based on an increase in the voltage value in the coil unit.

[0023] In order to solve the problem of how to detect leakage of the sealing end face of a fuel pump, the present invention has the following advantages:

[0024] By respectively arranging the first cable and the second cable in the first channel and the second channel of the insulator, the first cable and the second cable can be relatively isolated, so that the current cannot flow between the first cable and the second cable when the sealing end face between the first cavity and the second cavity of the fuel pump assembly does not leak; by arranging the third channel to pass through the body, the second channel, and the first channel of the insulator in sequence, when the sealing end face between the first cavity and the second cavity of the fuel pump assembly leaks, the oil can enter the second channel and the first channel through the third channel, and then contact the second cable and the first cable, so as to realize the flow of current between the first cable and the second cable; by arranging the first cable and the second cable to be electrically connected to the control unit respectively, it can be judged whether the sealing end face of the fuel pump assembly leaks according to whether the electrical signal between the first cable and the second cable changes. In addition, the coil unit can be used to realize the detection function of whether the sealing end face leaks, and the structure is simple, easy to install, and the space utilization rate is high. The shape of the coil unit is adapted to the shape of the sealing end face between the first cavity and the second cavity of the fuel pump assembly, and it has strong adaptability and is suitable for different installation scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a fuel pump assembly according to an embodiment is shown;

[0026] Figure 2 A partial schematic diagram of a detection component of an embodiment is shown;

[0027] Figure 3 A schematic diagram of a fuel pump assembly in another embodiment is shown;

[0028] Figure 4 Shows Figure 3 A partial enlarged view of an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of a coil unit according to an embodiment is shown;

[0030] Figure 6 A schematic diagram of a coil unit in another embodiment is shown;

[0031] Figure 7 A schematic diagram of a coil unit of another embodiment is shown;

[0032] Figure 8 A schematic diagram of a fuel pump leakage detection method according to an embodiment is shown.

[0033] Figure numerals: 01 fuel pump assembly; 11 housing unit; 111 first end cover; 112 second end cover; 113 outer shell; 114 oil inlet; 115 oil outlet; 12 pressurizing unit; 121 impeller; 122 flow channel shell; 13 motor unit; 131 motor shell; 132 rotor; 133 stator; 134 rotating shaft; 14 sealing unit; 141 sealing ring; 142 sealing groove; 02 detection assembly; 21 coil unit; 211 insulator; 2111 body; 2112 first channel; 2113 second channel; 2114 third channel; 212 first cable; 213 second cable; 22 control unit; 23 coil groove. DETAILED DESCRIPTION

[0034] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0035] As used herein, the term "including" and its variants are to be interpreted as open terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated system, element or component to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two systems, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different systems, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated systems, elements or components. Unless otherwise specified, "plurality" means two or more.

[0036] In a first aspect, this embodiment discloses a fuel pump leakage detection system, which may include:

[0037] The fuel pump assembly 01 includes a first chamber and a second chamber; the pressure of the first chamber is greater than the pressure of the second chamber; the fuel pump assembly 01 includes a sealing unit 14; the sealing unit 14 blocks the oil in the first chamber from flowing into the second chamber;

[0038] Detection component 02, detection component 02 includes a coil unit 21 and a control unit 22; the coil unit 21 is arranged at intervals on one side of the sealing unit 14 close to the second chamber; the coil unit 21 includes an insulator 211, a first cable 212, and a second cable 213; the insulator 211 includes a body 2111, a first channel 2112, a second channel 2113, and a third channel 2114; the body 2111 is an open ring; the first channel 2112 penetrates from one end of the body 2111 to the other end; the second channel 2113 penetrates from one end of the body 2111 to the other end; the first channel 2112 and the second channel 2114 are connected. 2113 are arranged at intervals; one end of the second channel 2113 extends toward the other end along the length direction of the first channel 2112, and is arranged on the peripheral side of the first channel 2112; the third channel 2114 passes through the main body 2111, the second channel 2113, and the first channel 2112 in sequence; multiple third channels 2114 are arranged at intervals in the main body 2111; the first channel 2112 is covered on the peripheral side of the first cable 212; the second channel 2113 is covered on the peripheral side of the second cable 213; one end of the first cable 212 is electrically connected to the control unit 22; one end of the second cable 213 is electrically connected to the control unit 22.

[0039] In this embodiment, the fuel pump assembly 01 can be immersed in the oil in the working state, and fully contact the oil while pumping out the oil, which is convenient for heat dissipation and noise reduction. The motor unit 13 of the fuel pump assembly 01 is isolated from the oil by a static sealing structure. In a complex airborne environment, small leaks may occur, which are not easy to detect and may reduce the efficiency of the motor unit 13. Therefore, a fuel pump leakage detection system is proposed to detect leakage on the sealing end face of the fuel pump. Figure 1 , Figure 2 As shown, the fuel pump leakage detection system may include a fuel pump component 01 and a detection component 02 .

[0040] like Figure 3As shown, the fuel pump assembly 01 is a core component of the aviation fuel supply system, which is used to pump fuel from the fuel tank and supply it to the fuel system. Generally, a first chamber and a second chamber can be set inside the fuel pump assembly 01. The shapes of the first chamber and the second chamber are not limited and can be adapted to the shape of the fuel pump assembly 01. The first chamber and the second chamber can accommodate related structures or parts of the fuel pump assembly 01. A sealing structure can be included between the first chamber and the second chamber to isolate each other. The pressure of the first chamber can be greater than the pressure of the second chamber. The pressure in the first chamber is relatively large, which is convenient for outputting the oil to the outside of the fuel pump assembly 01. The pressure in the second chamber is relatively small, which can accommodate components such as the motor unit 13, so as to facilitate the normal operation of various components in the second chamber. The fuel pump assembly 01 can also include a sealing unit 14. The shape of the sealing unit 14 is not limited and can be flexibly selected according to actual conditions. The sealing unit 14 can be used for the sealing structure between the first chamber and the second chamber to prevent the oil from entering the second chamber from the first chamber due to the pressure difference, thereby damaging the components in the second chamber or affecting their normal operation.

[0041] The detection component 02 can be used to detect and provide timely feedback on whether the oil in the sealing end surfaces of the first chamber and the second chamber is leaking. Figure 2 As shown, the detection component 02 may include a coil unit 21 and a control unit 22. The coil unit 21 is electrically connected to the control unit 22. The shape of the coil unit 21 is not limited and can be flexibly selected according to actual conditions. The control unit 22 can determine whether the oil is leaking by detecting the current change in the coil unit 21. Figure 3 As shown, the coil unit 21 can be spaced apart on one side of the sealing unit 14 close to the second chamber, so that when the sealing unit 14 fails, the oil will contact the coil unit 21 and trigger the change of the current on the coil unit 21. Figure 6As shown, the coil unit 21 may include an insulator 211, a first cable 212, and a second cable 213. The insulator 211 may be made of a high-resistance material and may have a certain flexibility, so as to provide protection for the first cable 212 and the second cable 213, while avoiding direct contact between the first cable 212 and the second cable 213 and the surrounding structure. The first cable 212 and the second cable 213 may be made of a material with a certain resistivity and may be used to conduct electrical signals. The insulator 211 may include a body 2111, a first channel 2112, a second channel 2113, and a third channel 2114. The body 2111 may be a solid part of the insulator 211, in an open ring shape, so as to adapt to the sealing structure between the first cavity and the second cavity. The first channel 2112, the second channel 2113, and the third channel 2114 may be channels opened on the body 2111, which may accommodate the first cable 212 and the second cable 213, or provide a channel for oil to flow through. The first channel 2112 can penetrate from one end of the body 2111 to the other end, and the second channel 2113 can penetrate from one end of the body 2111 to the other end, so that no matter where the oil leakage occurs in the body 2111, there is a corresponding first channel 2112 and a second channel 2113 corresponding to it, avoiding the situation where a small leakage in the subsequent process cannot be detected. The first channel 2112 can be spaced apart from the second channel 2113, so that the first channel 2112 and the second channel 2113 are spatially isolated by the body 2111 without direct contact. One end of the second channel 2113 can extend toward the other end along the length direction of the first channel 2112, and is arranged on the peripheral side of the first channel 2112, so that the first channel 2112 and the second channel 2113 are spatially adjacent. The third channel 2114 sequentially passes through the body 2111, the second channel 2113, and the first channel 2112, so that the first channel 2112 and the second channel 2113 can be spatially connected through the third channel 2114, and can be spatially connected to the external space of the body 2111 through the third channel 2114. A plurality of third channels 2114 are arranged in the body 2111 at intervals, so that the communication between the first channel 2112, the second channel 2113, and the external space of the body 2111 is easier to achieve. The first channel 2112 can accommodate the first cable 212, and the second channel 2113 can accommodate the second cable 213. In this case, the insulator 211 can provide protection for the first cable 212 and the second cable 213.At the same time, when the oil is not leaking, the first cable 212, the second cable 213 and the structure outside the insulator 211 are not in contact with each other, and no current change can be generated between the first cable 212 and the second cable 213; when the oil is leaking, the oil can enter the first channel 2112 and the second channel 2113 through the third channel 2114, and contact the first cable 212 and the second cable 213. Since aviation fuel has a certain conductivity, the first cable 212 and the second cable 213 can be electrically connected through the leaked oil, so that the current change occurs between the first cable 212 and the second cable 213. One end of the first cable 212 is electrically connected to the control unit 22, and one end of the second cable 213 is electrically connected to the control unit 22, so that the current change information of the first cable 212 and the second cable 213 can be fed back to the control unit 22 in a timely manner, so that the leakage of the oil is converted into a change in an electrical signal, which is convenient for monitoring.

[0042] In other embodiments, Figure 3 As shown, the surrounding shape of the sealing unit 14 can be annular to adapt to the sealing structure between the first chamber and the second chamber.

[0043] In other embodiments, Figure 5 As shown, the coil unit 21 may be in an open ring shape to adapt to the sealing structure between the first chamber and the second chamber.

[0044] In some other embodiments, the first cable 212 and the second cable 213 may be directly arranged on the original sealing structure. For example, a groove may be provided on one side of the sealing unit 14 close to the second cavity for placing the first cable 212 and the second cable 213, so as to simplify the sealing structure.

[0045] In some other embodiments, the number of the first cables 212 and the second cables 213 is not limited and can be flexibly selected according to actual needs.

[0046] In some embodiments, Figure 3 As shown, the fuel pump assembly 01 also includes a shell unit 11, a pressurizing unit 12, and a motor unit 13; a hollow chamber is formed inside the shell unit 11; one end of the pressurizing unit 12 is detachably connected to the inner wall of the shell unit 11, and the other end is detachably connected to the motor unit 13; the peripheral side of the pressurizing unit 12 close to one end of the motor unit 13 abuts against the inner wall of the shell unit 11; one end of the motor unit 13 away from the pressurizing unit 12 is detachably connected to the inner wall of the shell unit 11; the internal chamber of the pressurizing unit 12 serves as the first chamber; the outside of the motor unit 13 and the inner wall of the shell unit 11 surround to form a second chamber.

[0047] In this embodiment, if Figure 3As shown, the fuel pump assembly 01 may also include a housing unit 11, a pressurizing unit 12, and a motor unit 13. The housing unit 11 may form the boundary of the fuel pump assembly 01, and may separate the interior of the fuel pump assembly 01 from the external environment. At the same time, the housing unit 11 may have a certain strength to protect the internal structure from damage. The housing unit 11 may have a specific channel for the entry and exit of oil. A hollow chamber may be formed inside the housing unit 11 to accommodate components such as the pressurizing unit 12 and the motor unit 13. The pressurizing unit 12 is a component in the fuel pump assembly 01 that increases the oil pressure. By applying pressure to the oil, the oil can be transported along a specific pipeline path to a location where the oil needs to be consumed. One end of the pressurizing unit 12 may be detachably connected to the inner wall of the housing unit 11, and the other end may be detachably connected to the motor unit 13, so that the motor unit 13 can transmit power to the pressurizing unit 12. The peripheral side of the pressurizing unit 12 near the motor unit 13 can abut against the inner wall of the housing unit 11, thereby forming an isolation between the pressurizing unit 12 and the motor unit 13, preventing the oil from entering the motor unit 13 from the pressurizing unit 12, affecting the operation of the motor unit 13, and reducing the efficiency of the fuel pump assembly 01. The end of the motor unit 13 away from the pressurizing unit 12 can be detachably connected to the inner wall of the housing unit 11, so that the inner wall of the housing unit 11 can cooperate with a section of the pressurizing unit 12 near the motor unit 13 to form an isolation for the motor assembly, which can prevent the oil outside the fuel pump assembly 01 from entering the motor unit 13 and affecting the operation of the motor unit 13. The internal chamber of the pressurizing unit 12 can be used as a first chamber for contacting with the oil and pressurizing the oil, so that the fuel pump assembly 01 can pump the oil out and flow it to a designated location. The outside of the motor unit 13 and the inner wall of the housing unit 11 can surround and form a second chamber, so that in the event of oil leakage, the oil first enters the second chamber from the first chamber, thereby avoiding direct impact on the motor unit 13 and facilitating timely handling of oil leakage.

[0048] In other embodiments, Figure 3As shown, the housing unit 11 may include a first end cover 111, a second end cover 112, an outer shell 113, an oil inlet 114, and an oil outlet 115. The first end cover 111 and the second end cover 112 may be flange structures, and may cooperate with the outer shell 113 to protect the internal pressurizing unit 12 and the motor unit 13. The first end cover 111 is detachably connected to the side of the outer shell 113, and a static sealing structure may be provided between the first end cover 111 and the outer shell 113 to prevent oil leakage; the second end cover 112 is detachably connected to the side of the outer shell 113, and a static sealing structure may be provided between the second end cover 112 and the outer shell 113 to prevent oil leakage. The oil inlet 114 provides a passage for oil to enter the fuel pump assembly 01, and may be provided on the end face of the first end face. The connection mode of the oil inlet 114 and the first end face is not limited, and may be selected according to actual conditions, for example, it may be detachably connected, or may be fixedly connected to the first end face as a whole. The oil outlet 115 is used for the fuel pump assembly 01 to output pressurized oil, and can be provided on the outer housing 113. The connection method between the oil outlet 115 and the outer housing 113 is not limited and can be selected according to actual conditions, for example, it can be detachably connected or fixedly connected to the outer housing 113 as a whole.

[0049] In other embodiments, Figure 3 As shown, the pressurizing unit 12 may include an impeller 121 and a flow channel housing 122. The impeller 121 is fan-shaped with a certain curvature and is evenly distributed along the central axis of the pressurizing unit 12. The flow channel housing 122 is located inside the housing unit 11, surrounds the impeller 121 and is adapted to the shape of the impeller 121. When the impeller 121 rotates, the flow channel unit offsets the tendency of the oil to move radially along the air duct unit, forming a resultant force in a specific direction, so that the oil can achieve pressure increase and flow in a specific direction under the cooperation of the impeller 121 and the flow channel unit.

[0050] In other embodiments, Figure 3As shown, the motor unit 13 may include a motor housing 131, a rotor 132, a stator 133, and a rotating shaft 134. The motor housing 131 may be fixed to the inner wall surface of the housing unit 11 to protect the internal structure of the motor. Conductive coils may be wound around the rotor 132 and the stator 133 for conversion of electrical energy and magnetic energy. The rotor 132 is fixedly connected to the rotating shaft 134 in a detachable manner to achieve synchronous rotation around the axis of the rotating shaft 134. The stator 133 is fixed inside the motor housing 131, and the number of stators 133 is flexibly selected according to actual needs, and is evenly distributed around the circumferential track of the rotating shaft 134 with a certain radius. There may be a certain gap between the rotor 132 and the stator 133 to avoid collision during relative rotation. The rotating shaft 134 may coincide with the central axis of the air duct unit, thereby driving the impeller 121 to rotate, pressurizing the oil, and thus allowing the fuel pump assembly 01 to pump out fuel.

[0051] In some embodiments, Figure 4 As shown, the sealing unit 14 includes a sealing ring 141 and a sealing groove 142; the sealing groove 142 is arranged on the peripheral side of the pressurizing unit 12 close to one end of the motor unit 13; the sealing groove 142 is recessed in a direction away from the outer shell unit 11; the inner peripheral side of the sealing ring 141 abuts against the sealing groove 142, and its outer peripheral side abuts against the inner wall of the outer shell unit 11.

[0052] In this embodiment, if Figure 4 As shown, the sealing unit 14 may include a sealing ring 141 and a sealing groove 142. The sealing groove 142 may be formed in a ring shape to match the structure of the sealing end face. The sealing groove 142 may be arranged on the peripheral side of the pressurizing unit 12 close to one end of the motor unit 13, and may be recessed in a direction away from the housing unit 11, for accommodating the sealing ring 141. The cross-section of the sealing ring 141 may be circular, and may be formed in a complete ring and placed in the sealing groove 142. The inner peripheral side of the sealing ring 141 abuts against the sealing groove 142, and the outer peripheral side abuts against the inner wall of the housing unit 11, so that the gap between the sealing groove 142 and the housing unit 11 can be filled to prevent oil from penetrating or flowing into the gap.

[0053] In other embodiments, the sealing ring 141 may have a certain elasticity, and the diameter may be slightly larger than the width or depth of the sealing groove 142, so that extrusion is formed between the sealing ring 141 and the housing unit 11 at the sealing groove 142, further improving the sealing ability.

[0054] In some embodiments, Figure 4As shown, the detection component 02 also includes a coil slot 23; the coil unit 21 is arranged in the coil slot 23; the coil slot 23 is spaced apart on the side of the sealing slot 142 close to the motor unit 13; the inner peripheral side of the coil unit 21 abuts against the sealing slot 142, and the outer peripheral side abuts against the inner wall of the shell unit 11; 1mm≤A≤2mm, where A is the spacing distance between the coil slot 23 and the sealing slot 142.

[0055] In this embodiment, if Figure 4 As shown, the detection component 02 may also include a coil groove 23, which may be surrounded in a ring shape and adapted to the structure of the sealing end surface. The coil groove 23 may be arranged on the peripheral side of the pressurizing unit 12 near one end of the motor unit 13, and may be recessed in a direction away from the housing unit 11, so as to accommodate the coil unit 21 and protect the coil unit 21. The coil groove 23 is arranged at intervals on one side of the sealing groove 142 near the motor unit 13, so that the oil will enter the coil groove 23 and contact the coil unit 21 only when the sealing unit 14 fails. The inner peripheral side of the coil unit 21 abuts against the sealing groove 142, and the outer peripheral side abuts against the inner wall of the housing unit 11. 1mm≤A≤2mm, where A is the spacing distance between the coil groove 23 and the sealing groove 142. The smaller spacing distance makes the coil unit 21 more sensitive to oil detection, and even small leaks can be easily detected.

[0056] In some embodiments, Figure 6 As shown, 1 mm≤B≤2 mm; wherein B is the diameter of the first cable 212 .

[0057] In this embodiment, if Figure 6 As shown, 1mm≤B≤2mm; wherein B is the diameter of the first cable 212, that is, the diameter of the first cable 212 is between 1mm and 2mm. A smaller diameter of the first cable 212 is conducive to the lightweight of the coil unit 21 in the detection component 02, occupies less space, and has more application scenarios.

[0058] In some embodiments, Figure 6 As shown, 1 mm≤C≤2 mm; wherein C is the diameter of the second cable 213 .

[0059] In this embodiment, if Figure 6 As shown, 1mm≤C≤2mm; wherein C is the diameter of the second cable 213, that is, the diameter of the second cable 213 is between 1mm and 2mm. A smaller diameter of the second cable 213 is conducive to the lightweight of the coil unit 21 in the detection component 02, occupies less space, and has more application scenarios.

[0060] In some embodiments, Figure 7As shown, 0.5*B≤D1≤1.5*B, 0.5*B≤D2≤1.5*B, 0.5*C≤D3≤1.5*C; wherein D1 is the spacing distance between the first cable 212 and the adjacent second cable 213, D2 is the spacing distance between two adjacent first cables 212, and D3 is the spacing distance between two adjacent second cables 213.

[0061] In this embodiment, if Figure 7 As shown, 0.5*B≤D1≤1.5*B, 0.5*B≤D2≤1.5*B, 0.5*C≤D3≤1.5*C; wherein D1 is the spacing distance between the first cable 212 and the adjacent second cable 213, D2 is the spacing distance between the two adjacent first cables 212, and D3 is the spacing distance between the two adjacent second cables 213. That is, the spacing distance between the first cable 212 and the adjacent second cable 213 can be controlled to be 0.5 to 1.5 times the diameter of the first cable 212, the spacing distance between the two adjacent first cables 212 can be controlled to be 0.5 to 1.5 times the diameter of the first cable 212, and the spacing distance between the two adjacent second cables 213 can be controlled to be 0.5 to 1.5 times the diameter of the second cable 213. By controlling the spacing distance between the two adjacent first cables 212, the two adjacent second cables 213, and the adjacent first cables 212 and the second cables 213 within a suitable range, when the oil on the sealing end surface leaks, the coil unit 21 will have a more obvious current change, which is convenient for detection. When the spacing distance is too short, the insulator 211 cannot fully play its role, and two adjacent first cables 212, two adjacent second cables 213, and adjacent first cables 212 and second cables 213 are easily in contact due to bending and other factors, which affects the judgment of oil leakage; when the spacing distance is too long, the distance of the corresponding third channel 2114 is also longer. On the one hand, it is not conducive to the oil connecting the first cable 212 and the second cable 213 through the third channel 2114, and on the other hand, it may cause the resistance of the oil between the first cable 212 and the second cable 213 to be large, and the current change before and after the first cable 212 and the second cable 213 are connected is not obvious, which increases the difficulty of detection.

[0062] In some embodiments, Figure 7 As shown, 0.1 mm ≤ E1, 0.1 mm ≤ E2; wherein E1 is the spacing distance between the outer contour edge of the insulator 211 and the first cable 212; and E2 is the spacing distance between the outer contour edge of the insulator 211 and the second cable 213.

[0063] In this embodiment, if Figure 7As shown, 0.1mm≤E1, 0.1mm≤E2; wherein E1 is the spacing distance between the outer contour edge of the insulator 211 and the first cable 212; E2 is the spacing distance between the outer contour edge of the insulator 211 and the second cable 213. That is, the minimum distance between the first cable 212 and the second cable 213 and the outer edge contour of the insulator 211 is greater than or equal to 0.1mm. The insulator 211 can play a protective role on the first cable 212 and the second cable 213, and prevent the first cable 212 and the second cable 213 from contacting the coil slot 23. At the same time, when oil leaks, it can quickly contact the first cable 212 and the second cable 213 through the third channel 2114, thereby improving the sensitivity of oil leakage detection.

[0064] A fuel pump leakage detection method, the fuel pump leakage detection method is applied to any of the above fuel pump leakage detection systems, such as Figure 8 As shown, the fuel pump leakage detection method includes:

[0065] Step S10, obtaining an initial resistance value of the coil unit 21 before the coil unit 21 is installed in the coil slot 23;

[0066] Step S20, based on the initial resistance value of the coil unit 21 and the fuel pump leakage detection requirement, detecting the resistance value fluctuation of the coil unit 21; wherein the resistance value fluctuation includes the difference between the initial resistance value and the current resistance value of the coil unit 21;

[0067] Step S30, obtaining the short-circuit position of the coil unit 21 based on the resistance value fluctuation of the coil unit 21 being greater than or equal to the leakage threshold;

[0068] Step S40 , based on the short-circuit position of the coil unit 21 , the oil leakage position of the sealing unit 14 is obtained and a leakage alarm is issued.

[0069] In this embodiment, if Figure 8 As shown, the fuel pump leakage detection method may include:

[0070] Step S10, before installing the coil unit 21 to the coil slot 23, measure the initial resistance value of the coil unit 21, because the first cable 212 and the second cable 213 are only connected at the control unit 22, and separated by the insulator 211 in the coil unit 21, the electrical circuit is in an open circuit state, the electrical signal value is detected as 0, and the resistance value is infinite. Then install the coil unit 21 to the coil slot 23.

[0071] Step S20, using the control unit 22 to detect the change of the electrical signal of the electrical circuit, when the oil leaks, the first cable 212 and the second cable 213 are electrically connected through the oil, and the control unit 22 can obtain the current resistance value of the coil unit 21 by detecting the current circuit electrical signal, and obtain the resistance value fluctuation by calculating the difference with the initial resistance value of the coil unit 21. Therefore, it can be judged whether the fuel pump assembly 01 is leaking by the resistance value fluctuation.

[0072] Step S30, setting a leakage threshold of the resistance value fluctuation. When the resistance value fluctuation is greater than the set leakage threshold, it is proved that the oil at the sealing unit 14 has leaked. At the same time, according to the magnitude of the resistance value fluctuation, the position where the coil unit 21 is short-circuited can be determined, so as to facilitate the inference of the corresponding oil leakage position.

[0073] In other embodiments, the internal program of the control unit 22 includes a positioning algorithm for inferring the leakage position of the sealing unit 14. The principle of the positioning algorithm is: recording the short circuit of the coil unit 21 caused by leakage at various positions of the sealing unit 14, and the corresponding changes in the electrical signal detected by the control unit 22, and forming a one-to-one correspondence with the magnitude of the resistance value fluctuation, thereby inferring the leakage position of the sealing unit 14 through the resistance value fluctuation.

[0074] In step S40, according to the short-circuit position of the coil unit 21, the oil leakage position of the corresponding sealing unit 14 can be obtained and a leakage alarm can be issued, so as to deal with the oil leakage at the corresponding position in time.

[0075] In some embodiments, the fuel pump leakage detection method further includes:

[0076] Step S31, based on the resistance fluctuation of the coil unit 21 being less than the leakage threshold, the control unit 22 increases the voltage value in the coil unit 21;

[0077] In step S32 , based on the increase in the voltage value in the coil unit 21 , the resistance value fluctuation of the coil unit 21 is detected.

[0078] In this embodiment, the fuel pump leakage detection method further includes:

[0079] Step S31, when the resistance value fluctuation of the coil unit 21 is less than the leakage threshold, the possible reasons are: first, the oil has not leaked, the circuit between the first cable 212 and the second cable 213 is open, and the electrical signal does not change, resulting in a small fluctuation in the calculated resistance value; second, the oil leakage is small, the first cable 212 and the second cable 213 are electrically connected through the oil, but the resistance at the connection is large, and the change in the electrical signal measured by the control unit 22 is small, so the calculated resistance value fluctuates small. When the voltage value in the coil unit 21 is increased, the former is open circuit, the electrical signal does not change, and the resistance value fluctuates to 0, and the latter is closed circuit, the change in the electrical signal is amplified, and the corresponding resistance value fluctuation becomes larger.

[0080] Step S32, when the voltage value in the coil unit 21 increases, the resistance value fluctuation of the coil unit 21 is detected, and if the resistance value fluctuation is greater than the leakage threshold, it indicates that oil leakage occurs at the sealing end surface. In this way, leakage detection of the sealing end surface of the fuel pump can be achieved.

[0081] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present disclosure.

Claims

1. A fuel pump leakage detection system, characterized in that: The fuel pump leakage detection system comprises: A fuel pump assembly, wherein a first chamber and a second chamber are arranged inside the fuel pump assembly; the pressure of the first chamber is greater than the pressure of the second chamber; the fuel pump assembly comprises a sealing unit; the sealing unit blocks the oil in the first chamber from flowing into the second chamber; A detection component, the detection component includes a coil unit and a control unit; the coil unit is arranged at intervals on a side of the sealing unit close to the second chamber; the coil unit includes an insulator, a first cable, and a second cable; the insulator includes a body, a first channel, a second channel, and a third channel; the body is in an open ring shape; the first channel penetrates from one end of the body to the other end; the second channel penetrates from one end of the body to the other end; the first channel and the second channel are arranged at intervals; one end of the second channel extends toward the other end along the length direction of the first channel and is arranged on the circumference of the first channel; the third channel passes through the body, the second channel, and the first channel in sequence; a plurality of third channels are arranged at intervals in the body; the first channel is covered on the outer circumference of the first cable; the second channel is covered on the outer circumference of the second cable; one end of the first cable is electrically connected to the control unit; one end of the second cable is electrically connected to the control unit; The fuel pump assembly further comprises a housing unit, a pressurizing unit and a motor unit; a hollow chamber is formed inside the housing unit; one end of the pressurizing unit is detachably connected to the inner wall of the housing unit, and the other end is detachably connected to the motor unit; the peripheral side of the pressurizing unit close to one end of the motor unit abuts against the inner wall of the housing unit; one end of the motor unit away from the pressurizing unit is detachably connected to the inner wall of the housing unit; the internal chamber of the pressurizing unit serves as the first chamber; the outside of the motor unit and the inner wall of the housing unit surround and form the second chamber; The sealing unit comprises a sealing ring and a sealing groove; the sealing groove is arranged on the peripheral side of the pressurizing unit close to one end of the motor unit; the sealing groove is recessed in a direction away from the housing unit; the inner peripheral side of the sealing ring abuts against the sealing groove, and the outer peripheral side thereof abuts against the inner wall of the housing unit; The detection component also includes a coil groove; the coil unit is arranged in the coil groove; the coil groove is spaced apart and arranged on the side of the sealing groove close to the motor unit; the inner peripheral side of the coil unit abuts against the sealing groove, and the outer peripheral side abuts against the inner wall of the shell unit; 1mm≤A≤2mm, wherein A is the spacing distance between the coil groove and the sealing groove.

2. A fuel pump leakage detection system according to claim 1, characterized in that: 1mm≤B≤2mm; wherein B is the diameter of the first cable.

3. A fuel pump leakage detection system according to claim 2, characterized in that: 1mm≤C≤2mm; wherein C is the diameter of the second cable.

4. A fuel pump leakage detection system according to claim 3, characterized in that: 0.5*B≤D1≤1.5*B, 0.5*B≤D2≤1.5*B, 0.5*C≤D3≤1.5*C; wherein D1 is the spacing distance between the first cable and the adjacent second cable, D2 is the spacing distance between two adjacent first cables, and D3 is the spacing distance between two adjacent second cables.

5. A fuel pump leakage detection system according to claim 4, characterized in that: 0.1mm≤E1, 0.1mm≤E2; wherein E1 is the spacing distance between the outer contour edge of the insulator and the first cable; E2 is the spacing distance between the outer contour edge of the insulator and the second cable.

6. A fuel pump leakage detection method, characterized in that: The fuel pump leakage detection method is applied to a fuel pump leakage detection system according to any one of claims 1 to 5, and the fuel pump leakage detection method comprises: Step S10, obtaining an initial resistance value of the coil unit before the coil unit is installed in the coil slot; Step S20, detecting a resistance value fluctuation of the coil unit based on the initial resistance value of the coil unit and a fuel pump leakage detection requirement; wherein the resistance value fluctuation includes a difference between the initial resistance value and the current resistance value of the coil unit; Step S30, obtaining a short-circuit position of the coil unit based on the resistance value fluctuation of the coil unit being greater than or equal to a leakage threshold; Step S40: based on the short-circuit position of the coil unit, the oil leakage position of the sealing unit is obtained and a leakage alarm is issued.

7. A fuel pump leakage detection method according to claim 6, characterized in that: The fuel pump leakage detection method further comprises: Step S31, based on the resistance fluctuation of the coil unit being less than a leakage threshold, the control unit increases the voltage value in the coil unit; Step S32: detecting fluctuation in resistance of the coil unit based on an increase in the voltage value in the coil unit.

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