Oil pump suitable for biodiesel, methanol and ethanol

Abstract

The invention discloses an oil pump suitable for biodiesel, methanol and ethanol. The oil pump comprises a pump cover assembly, a circuit board assembly, a stator assembly, a shell, an isolation hood with an opening in the bottom, a rotor assembly, an oil inlet assembly, an oil passing seat, an oil inlet seat, a first one-way valve, a second one-way valve, a first pressure release valve and a second pressure release valve. According to the invention, a complete technical system which takes isolation protection as a basis, function integration as a core and safety protection as a guarantee is constructed around the special requirement of corrosive medium conveying, and the industrial problem that corrosion resistance, multiple functions and high safety cannot be considered at the same time in the prior art is solved.

Description

Technical Field

[0001] This invention relates to an oil pump suitable for biodiesel, methanol, and ethanol. Background Technology

[0002] With the promotion of clean energy, the application of alternative fuels such as biodiesel, methanol, and ethanol is becoming increasingly widespread. However, these fuels are corrosive, especially in the presence of electricity, where their corrosiveness is further enhanced.

[0003] In existing diesel pump designs, metal components such as the stator assembly and power supply copper parts on the circuit board are typically directly exposed to the oil passage space inside the pump body, or lack an effective isolation structure between them and the oil passage. When the diesel pump delivers biodiesel, methanol, or ethanol, these corrosive media come into direct contact with the power supply copper parts, stator silicon steel sheets, and other metal components. Electrochemical corrosion occurs under energized conditions, leading to damage to the metal components, poor wiring contact, and ultimately causing the diesel pump to malfunction or experience performance degradation, severely shortening the equipment's service life.

[0004] In addition, most existing diesel pumps only support unidirectional fuel supply, which cannot meet the forward and reverse fuel supply needs in some scenarios (such as fuel tank replenishment and pipeline reverse flushing); and some diesel pumps with forward and reverse functions do not have a targeted pressure relief protection structure. When the pipeline is blocked or the fuel supply pressure reaches the critical value, it cannot release pressure in time, which can easily lead to pipeline rupture and pose a safety hazard.

[0005] There is currently no effective solution to the above problems. There is an urgent need for an oil pump that can achieve corrosion isolation, forward and reverse oil supply, and pressure protection to meet the transportation needs of corrosive fuels such as biodiesel, methanol, and ethanol. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides an oil pump suitable for biodiesel, methanol, and ethanol, which overcomes the defects of existing diesel pumps in transporting biodiesel, methanol, and ethanol, such as corrosion failure, inability to supply oil in both forward and reverse directions, and lack of pressure protection, effectively solving the problems pointed out in the background art.

[0007] The technical solution adopted in this invention is:

[0008] An oil pump suitable for biodiesel, methanol, and ethanol includes a pump cover assembly, a circuit board assembly, a stator assembly, a housing, a bottom-opening isolation cover, a rotor assembly, an oil inlet assembly, an oil passage seat, an oil inlet seat, a first check valve, a second check valve, a first pressure relief valve, and a second pressure relief valve.

[0009] The outer shell has a hollow cavity structure, the stator assembly is disposed inside the outer shell, the circuit board assembly is electrically connected to the stator assembly, and the circuit board assembly is provided with power supply copper components;

[0010] The isolation cover is wrapped around the outer periphery of the rotor assembly, and the bottom is sealed to the top of the oil inlet seat through a sealing structure, completely isolating the stator assembly, power supply copper parts, oil inlet assembly, oil inlet seat and the oil passage formed by the oil inlet seat.

[0011] The rotor assembly is disposed within the oil passage and corresponds to and cooperates with the stator assembly to achieve drive rotation. An oil inlet channel is formed between the oil inlet end of the oil inlet seat, the oil passage seat, and the rotor assembly. An oil outlet channel is formed between the oil outlet end of the oil inlet seat, the oil passage seat, and the rotor assembly. The oil inlet assembly is connected to the oil passage seat. The first one-way valve is disposed at the oil outlet end of the oil inlet seat, and the flow direction of the first one-way valve is outflow from the oil inlet seat. The first pressure relief valve is disposed on the oil outlet channel, with one end of the pressure relief valve connected to the oil outlet channel and the other end connected to the oil inlet channel. The second one-way valve is disposed on the oil inlet seat and is connected to the oil outlet channel, with the flow direction of the second one-way valve being inflow into the oil outlet channel. The second pressure relief valve is disposed within the oil inlet seat, with one end of the pressure relief valve connected to the oil inlet end of the oil inlet seat and the other end connected to the oil outlet channel.

[0012] The pump cover assembly fits over the top opening of the housing, achieving an overall seal.

[0013] Preferably, when the rotor assembly rotates in the forward direction, the oil pump pumps oil in the forward direction, and when the rotor assembly rotates in the reverse direction, the oil pump replenishes oil.

[0014] Preferably, when the oil pump is pumping oil in the forward direction, if the oil outlet end of the oil inlet seat is blocked, causing excessive pressure in the oil outlet channel, the second pressure relief valve will relieve the pressure in the oil outlet channel, so that some of the medium in the oil outlet channel returns to the oil inlet channel.

[0015] Preferably, when the oil pump is replenishing oil, if the oil inlet end of the oil inlet seat is blocked, causing excessive pressure in the oil inlet channel, the first pressure relief valve will relieve the pressure in the oil inlet channel, causing some of the medium in the oil inlet channel to return to the oil outlet channel.

[0016] Preferably, the sealing structure includes a sealing ring extending radially outward from the bottom of the isolation cover, an annular sealing groove formed at the top of the oil passage seat, and a sealing ring matched and disposed within the annular sealing groove.

[0017] Preferably, the isolation cover is made of stainless steel and has a thickness of 3-5 mm.

[0018] Preferably, both the first and second pressure relief valves are spring-loaded pressure relief valves with a preset pressure relief of 0.6-1.0 MPa.

[0019] Preferably, both the first and second check valves are ball-shaped check valves, and the plugs are made of fluororubber.

[0020] Preferably, both the first and second check valves are planar sealing check valves, and the plugs are made of fluororubber.

[0021] The innovative aspects of this invention are as follows:

[0022] I. Corrosion Isolation: An innovative dual-protection approach combining physical isolation and material compatibility, solving the problem of electrochemical corrosion at its source.

[0023] The core flaw of existing technologies is that "metal components (stator assemblies, power supply copper parts) are in direct contact with corrosive media," and they rely solely on passive protection with corrosion-resistant materials (such as coatings or single materials), which cannot avoid the fundamental problem of "electrochemical corrosion under energized conditions." This solution achieves "complete decoupling between the drive system and the oil-contaminated system" through an active physical isolation design of "isolation cover + sealing structure," as detailed below:

[0024] 1. Innovative structural design of the isolation enclosure

[0025] The design employs a "bottom-opening, fully enclosed structure": the isolation cover completely encloses the outer periphery of the rotor assembly, and is only sealed to the oil inlet seat at the bottom. This completely isolates the stator assembly, the power supply copper components on the circuit board from the oil passage enclosed by the "oil inlet assembly-oil inlet seat-oil inlet seat", forming a physical barrier between the "drive side (oil-free) and the oil-contaminated side (with corrosive media)". This prevents the medium from contacting the conductive metal components and blocks electrochemical corrosion from the source (existing technologies do not have such a fully isolated structure; most are partial shielding or use corrosion-resistant materials).

[0026] Precise matching of materials and thickness: Stainless steel material is selected to avoid the isolation cover itself becoming a carrier of corrosive media, and the thickness is limited to 3-5mm - to ensure structural strength (to prevent the isolation cover from deforming due to vibration during rotor rotation) and to avoid excessive thickness affecting the magnetic coupling drive efficiency of stator and rotor (thinner than 3mm is prone to deformation, thicker than 5mm will weaken magnetic field conduction), thus balancing "protection" and "drive".

[0027] 2. Innovative details in the sealing structure

[0028] The seal between the isolation cover and the oil passage seat is not a conventional planar seal, but rather a triple seal structure designed with a "radial sealing ring + annular sealing groove + sealing ring":

[0029] The radial sealing ring extending outward from the bottom of the isolation cover precisely matches the annular sealing groove opened at the top of the oil well seat, and then the sealing ring is embedded to form an "embedded seal";

[0030] This structure can effectively counteract the radial runout of the rotor during rotation (within ±0.1mm), prevent the sealing gap from expanding due to vibration and causing media leakage, and is also suitable for the sealing requirements of low viscosity media such as biodiesel and methanol (conventional flat seals are prone to leakage due to low media viscosity), achieving "long-term sealing under dynamic working conditions".

[0031] II. Functional Integration: The scenario-based innovation of "forward and reverse oil supply + bidirectional flow control" breaks through the limitations of unidirectional flow.

[0032] Most existing diesel pumps only support "one-way fuel supply," which cannot meet the needs of scenarios such as "fuel tank replenishment (requiring reverse pumping)" and "pipeline backflushing (requiring reverse flow)." A few pumps with forward and reverse rotation functions suffer from "disordered flow and low efficiency" during bidirectional fuel supply due to a lack of flow control design. This solution achieves the dual goals of "functional coverage and precise flow control" through a collaborative design of "rotor drive + bidirectional check valve."

[0033] 1. Adaptation to scenarios driven by forward and reverse rotation:

[0034] The bidirectional function of the rotor assembly is clearly defined: When rotating in the forward direction, the oil pump supplies oil in the forward direction through the channel of "oil inlet end of inlet seat → oil outlet seat → rotor assembly → oil outlet end of inlet seat" (meeting the needs of conventional fuel delivery); when rotating in the reverse direction, it replenishes oil in the reverse direction through the channel of "oil inlet assembly → oil outlet seat → rotor assembly → oil inlet end of inlet seat" (meeting the needs of external oil replenishment when the fuel tank is low and reverse flushing of residual media in the pipeline), covering the needs of the entire scenario of "delivery-oil replenishment-maintenance";

[0035] 2. Flow control innovation of bidirectional check valves:

[0036] To address the issue of turbulent medium flow during forward and reverse rotation, a bidirectional locking structure consisting of a "first check valve + second check valve" is designed.

[0037] The first check valve is located at the oil outlet end of the oil inlet seat, and the flow direction is limited to "flowing out of the oil inlet seat" - when supplying oil in the forward direction, the medium can pass smoothly through the valve and be output; when replenishing oil in the reverse direction, the valve is closed to prevent the medium from flowing back from the oil outlet end to the oil inlet seat, thus ensuring stable replenishment pressure.

[0038] The second one-way valve is located on the oil inlet seat body, and the flow direction is limited to "flow into the oil outlet channel" - when replenishing oil in the reverse direction, the medium can enter the oil outlet channel through this valve, and then be driven by the rotor to be transported to the oil inlet end in the reverse direction; when supplying oil in the forward direction, this valve is closed to prevent the medium from being diverted from the oil outlet channel to the oil inlet seat, thus ensuring the oil supply efficiency.

[0039] Two types of check valve plugs are made of fluororubber: fluororubber has excellent chemical corrosion resistance, is suitable for multi-media working conditions, and avoids sealing failure;

[0040] III. Safety Protection: The innovative closed-loop protection system of "two-way pressure relief + pressure adaptation" eliminates the risk of pipeline rupture.

[0041] Existing oil pumps with forward and reverse rotation functions generally lack a pressure relief structure designed for "bidirectional operation." Blockage at the outlet during forward oil supply and blockage at the inlet during reverse oil replenishment can both lead to a sudden pressure surge in the channel, ultimately causing pipeline rupture. This solution constructs a closed-loop pressure protection system covering both forward and reverse operation through a design of "dual pressure relief valves + operating condition matching."

[0042] 1. Pressure relief valve designed specifically for different operating conditions:

[0043] Based on the pressure risk points during forward and reverse rotation, the pressure relief valve is precisely matched with the channel to achieve "precise pressure relief wherever the pressure is high":

[0044] Forward oil supply scenario: The first pressure relief valve is set in the oil outlet channel, with one end connected to the oil outlet channel and the other end connected to the oil inlet channel; when the oil outlet end of the oil inlet seat is blocked, causing the pressure in the oil outlet channel to exceed the preset value (0.6-1.0MPa), the first pressure relief valve opens, "returning" some of the medium in the oil outlet channel to the oil inlet channel, quickly reducing the pressure on the oil outlet side and preventing the oil outlet pipeline from bursting;

[0045] Reverse oil replenishment scenario: The second pressure relief valve is located inside the oil inlet seat, with one end connected to the oil inlet end of the oil inlet seat and the other end connected to the oil outlet channel; when the oil inlet end of the oil inlet seat is blocked, causing the pressure in the oil inlet channel to exceed the standard, the second pressure relief valve opens, "guiding" the medium in the oil inlet channel to the oil outlet channel, relieving the pressure on the oil inlet side and preventing the oil inlet pipe from rupturing;

[0046] 2. Precise adaptation of pressure relief parameters:

[0047] Both types of pressure relief valves adopt a "spring-loaded structure" and limit the preset pressure relief to 0.6-1.0 MPa. This range matches the delivery pressure requirements of biodiesel and methanol (normal delivery pressure 0.3-0.5 MPa, with a safety margin) while avoiding "frequent pressure relief and decreased fuel supply efficiency" due to excessively low pressure. At the same time, the spring stiffness has been optimized (the spring stiffness for forward pressure relief is slightly higher than that for reverse pressure relief, with a difference of 0.1-0.2 MPa) to adapt to different pressure fluctuation characteristics during forward and reverse rotation, ensuring the "timeliness and stability" of the pressure relief response. The plug of the pressure relief valve is made of fluororubber, which has excellent chemical corrosion resistance, is suitable for multi-media working conditions, and avoids sealing failure.

[0048] IV. System Collaboration: The collaborative design with multiple innovative elements achieves the integration of "protection-function-security".

[0049] The three major innovations mentioned above do not exist in isolation, but rather form a systemic effect of "1+1+1>3" through structural coupling:

[0050] 1. The "full enclosure + dynamic sealing" of the isolation cover prevents corrosive media from eroding the stator and power supply copper components, providing a foundation for the long-term operation of the forward and reverse rotation functions;

[0051] 2. The synergy between the two-way check valve and the double pressure relief valve not only makes forward and reverse oil supply "achievable", but also "safe" - the check valve ensures that the flow direction is not disordered, and the pressure relief valve ensures that the pressure does not exceed the standard, avoiding new safety risks brought about by functional expansion;

[0052] 3. The pump cover assembly provides an "overall seal" to the top of the housing, which, together with the bottom seal of the isolation cover, forms a "double seal" that further enhances the overall anti-leakage capability of the pump body, making it suitable for use with volatile media such as biodiesel and methanol (avoiding the safety hazards caused by the evaporation of the media mixing with the air).

[0053] This invention addresses the specific needs of "corrosive media transportation" by constructing a complete technical system based on "isolation and protection, with functional integration as the core and safety protection as the guarantee," thus solving the industry problem that existing technologies cannot simultaneously achieve "corrosion resistance, multifunctionality, and high safety." Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the structure of the present invention;

[0055] Figure 2 for Figure 1 Enlarged view of part A;

[0056] Figure 3 This is a schematic diagram of the exploded structure of the present invention;

[0057] Figure 4 This is a flow diagram of the medium during normal oil pumping in this invention;

[0058] Figure 5 This is a flow diagram of the medium during reverse oil replenishment according to the present invention. Detailed Implementation

[0059] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0060] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0061] Furthermore, in the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0065] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0066] like Figure 1-3As shown, an oil pump suitable for biodiesel, methanol, and ethanol includes a pump cover assembly 1, a circuit board assembly 2, a stator assembly 3, a housing 4, a bottom-opening isolation cover 5, a rotor assembly 6, an oil inlet assembly 7, an oil passage seat 8, an oil inlet seat 10, a first check valve 11, a second check valve 12, a first pressure relief valve 9, and a second pressure relief valve 13.

[0067] The outer shell 4 has a hollow cavity structure, the stator assembly 3 is disposed inside the outer shell 4, the circuit board assembly 2 is electrically connected to the stator assembly 3, and the circuit board assembly 2 is provided with power supply copper parts;

[0068] The isolation cover 5 is wrapped around the outer periphery of the rotor assembly 6, and the bottom is sealed to the top of the oil inlet seat 8 through a sealing structure, completely isolating the oil passage formed by the stator assembly 3, the power supply copper parts, the oil inlet assembly 7, the oil inlet seat 8 and the oil inlet seat 10.

[0069] The rotor assembly 6 is disposed within the oil passage and corresponds to and cooperates with the stator assembly 3 to achieve drive rotation. An oil inlet channel 21 is formed between the oil inlet end 26 of the oil inlet seat 10, the oil passage seat 8, and the rotor assembly 6. An oil outlet channel 22 is formed between the oil outlet end 27 of the oil inlet seat 10, the oil passage seat 8, and the rotor assembly 6. The oil inlet assembly 7 is connected to the oil passage seat 8. The first one-way valve 11 is disposed at the oil outlet end 27 of the oil inlet seat 10, and the flow direction of the first one-way valve 11 is outflow from the oil inlet seat 10. The first pressure relief valve 9 is disposed... The first pressure relief valve 9 is placed on the oil outlet channel 22. One end of the pressure relief valve 9 is connected to the oil outlet channel 22, and the other end is connected to the oil inlet channel 21. The second one-way valve 12 is set on the oil inlet seat 10 and is connected to the oil outlet channel 22. The flow direction of the second one-way valve 12 is to flow into the oil outlet channel 22. The second pressure relief valve 13 is set in the oil inlet seat 10. One end of the pressure relief valve 13 is connected to the oil inlet end 26 of the oil inlet seat 10, and the other end is connected to the oil outlet channel 22.

[0070] The pump cover assembly 1 covers the top opening of the housing 4, achieving an overall seal.

[0071] When the rotor assembly 6 rotates in the forward direction, the oil pump pumps oil in the forward direction; when the rotor assembly 6 rotates in the reverse direction, the oil pump replenishes oil.

[0072] When the oil pump is pumping oil in the forward direction, if the oil outlet end 27 of the oil inlet seat 10 is blocked, causing the pressure in the oil outlet channel 22 to be too high, the second pressure relief valve 13 will relieve the pressure in the oil outlet channel 22, so that some of the medium in the oil outlet channel 22 returns to the oil inlet channel 21.

[0073] When the oil pump is replenishing oil, if the oil inlet end 26 of the oil inlet seat 10 is blocked, causing the pressure in the oil inlet channel 21 to be too high, the first pressure relief valve 9 will relieve the pressure in the oil inlet channel 21, so that some of the medium in the oil inlet channel 21 returns to the oil outlet channel 22.

[0074] The sealing structure includes a sealing ring 23 extending radially outward from the bottom of the isolation cover 5, an annular sealing groove 24 opened on the top of the oil passage seat 8, and a sealing ring 25 matched and disposed in the annular sealing groove 24.

[0075] The isolation cover 5 is made of stainless steel and has a thickness of 3-5mm.

[0076] The first pressure relief valve 9 and the second pressure relief valve 13 are both spring-loaded pressure relief valves with a preset pressure relief of 0.6-1.0 MPa.

[0077] The first check valve 11 and the second check valve 12 are both ball check valves, and the plugs are made of fluororubber.

[0078] The first check valve 11 and the second check valve 12 are both planar sealing check valves, and the plugs are made of fluororubber.

[0079] This invention achieves safe and efficient delivery of corrosive fuel through a triple core design of "corrosion isolation and protection + forward and reverse operation adaptation + bidirectional pressure relief protection". Its working principle needs to be explained from four aspects: "basic protection logic", "forward pumping operation", "reverse replenishment operation" and "system coordination mechanism".

[0080] I. Overall Structure and Basic Protection Principles (Core Premise):

[0081] The normal operation of the oil pump is based on "blocking electrochemical corrosion"—through structural design, the "drive system (stator, power supply copper components)" is completely isolated from the "oil passage system (containing corrosive media)," while ensuring drive efficiency and sealing reliability, thus guaranteeing subsequent forward and reverse rotation functions.

[0082] 1.1 Core Structure Partitions:

[0083] The oil pump is divided into a "drive side" and an "oil passage side," which are physically isolated by an "isolation cover + sealing structure."

[0084] Drive side: Includes housing (hollow cavity), stator assembly (fixed inside the housing), circuit board assembly (electrically connected to the stator, including power supply copper parts), pump cover assembly (sealing the top opening of the housing), the core function is to provide the driving force for rotor rotation (magnetic coupling drive).

[0085] Oil passage side: includes an isolation cover (open at the bottom, covering the outer periphery of the rotor), rotor assembly (located in the oil passage), oil inlet assembly, oil passage seat, oil inlet seat, oil inlet / outlet channel, the core function of which is to transport corrosive media such as biodiesel, methanol, and ethanol;

[0086] 1.2 Corrosion Isolation Logic:

[0087] Physical isolation barrier: The isolation cover is made of stainless steel with a thickness of 3-5mm (thinner than 3mm is prone to deformation due to rotor vibration, and thicker than 5mm weakens magnetic field conduction). It completely covers the outer periphery of the rotor and is only sealed to the oil inlet seat at the bottom. This completely separates the stator and power supply copper parts on the drive side from the oil inlet channel enclosed by the "oil inlet assembly-oil inlet seat-oil inlet seat" on the oil inlet side, preventing corrosive media from contacting the metal conductive parts and blocking "electrochemical corrosion under power supply environment" from the root.

[0088] Dynamic sealing guarantee: The isolation cover and oil passage seat adopt a triple sealing structure of "radial sealing ring + annular sealing groove + sealing ring".

[0089] The radial sealing ring extending outward from the bottom of the isolation cover can offset the ±0.1mm radial runout during rotor rotation, preventing vibration from widening the sealing gap;

[0090] The "annular sealing groove" on the top of the oil seat precisely matches the sealing ring to form an "embedded seal," which is suitable for the sealing requirements of low-viscosity media such as methanol and biodiesel (conventional flat seals are prone to leakage), and achieves "long-term anti-leakage under dynamic working conditions."

[0091] 1.3 Basic Driving Logic:

[0092] When the stator assembly is energized, it generates an alternating magnetic field, which forms a "magnetic coupling drive" with the rotor assembly on the oil side through an isolation cover (electrically insulated but not hindering magnetic field conduction) - the rotor rotates in the direction of the stator magnetic field (forward / reverse controllable), providing power for medium transport, and the isolation cover does not affect the magnetic coupling efficiency.

[0093] II. Working principle of forward pump oil supply (conventional fuel delivery):

[0094] like Figure 4 As shown, when the rotor assembly rotates in the forward direction, the oil pump enters the "forward pumping mode" to meet the transportation requirements of conventional fuels (biodiesel, methanol, etc.). The arrows in the diagram indicate the flow direction of the medium, and the process is as follows:

[0095] 2.1 Medium flow path:

[0096] Oil inlet end of oil inlet seat → oil inlet channel → rotor rotates in the forward direction to generate "thrust + negative pressure" → medium is pushed into oil outlet channel → first one-way valve (oil outlet end of oil inlet seat, flow direction is "out of oil inlet seat") opens → medium is output from oil outlet end to target pipeline.

[0097] 2.2 Flow control function of check valves:

[0098] First check valve: Because the pressure of the medium in the oil outlet channel is higher than that of the external pipeline, the valve opens automatically to ensure smooth output of the medium; if the pressure of the subsequent pipeline fluctuates, the check valve can close in reverse to prevent the medium from flowing back into the oil pump from the oil outlet end and stabilize the oil supply pressure.

[0099] The second check valve is located on the oil inlet seat body and is connected to the oil outlet channel. The flow direction is "into the oil outlet channel" - when pumping oil in the forward direction, the medium pressure in the oil outlet channel is higher than that on the oil inlet side. The second check valve will automatically close to prevent the medium from diverting from the oil outlet channel back to the oil inlet seat and to ensure that the oil supply efficiency is not lost.

[0100] 2.3 Pressure relief protection mechanism (oil outlet blockage scenario):

[0101] If the oil outlet pressure rises suddenly due to pipe blockage, valve closure, or other reasons, and the pressure reaches 0.6-1.0 MPa (the preset value of the first / second pressure relief valve):

[0102] The second pressure relief valve (located inside the oil inlet seat, with one end connected to the oil outlet channel and the other end connected to the oil inlet end of the oil inlet seat) opens automatically;

[0103] Part of the medium in the oil outlet channel flows back to the "oil inlet end of the oil inlet seat → oil inlet channel" through the second pressure relief valve, which quickly reduces the pressure in the oil outlet channel.

[0104] When the pressure in the oil outlet channel drops to a safe value (<0.6MPa), the second pressure relief valve closes due to spring reset, restoring normal oil supply and preventing the oil outlet pipeline from bursting due to overpressure.

[0105] III. Working principle of reverse oil replenishment (fuel tank replenishment / pipeline flushing):

[0106] like Figure 5 As shown, when the rotor assembly rotates in reverse, the oil pump enters the "reverse oil replenishment mode," meeting the needs of scenarios such as "external oil replenishment when the oil tank is low" and "reverse flushing of residual media in the pipeline." The arrows in the diagram indicate the direction of media flow, and the process is as follows:

[0107] 3.1 Medium flow path:

[0108] External oil replenishment / flushing medium → oil inlet assembly → oil seat → rotor reverse rotation generates "reverse thrust" → medium is pushed into the oil inlet channel → medium is output from the oil inlet end of the oil seat (replenishing the oil tank or flushing pipeline);

[0109] 3.2 Flow control function of one-way valves

[0110] First check valve: When replenishing oil in the reverse direction, the first check valve (flow direction "outflow from inlet seat") automatically closes to ensure stable replenishment pressure (avoiding loss of replenishment efficiency).

[0111] Second check valve: The second check valve (flow direction "inflow to outflow channel") opens automatically, allowing the medium to flow in the reverse direction;

[0112] 3.3 Pressure relief protection mechanism (oil inlet blockage scenario):

[0113] If the pressure in the oil inlet is suddenly increased due to blockage of the oil tank opening, filter screen, or other reasons, and the pressure reaches 0.6-1.0 MPa:

[0114] The first pressure relief valve (located on the oil outlet channel, with one end connected to the oil outlet channel and the other end connected to the oil inlet channel) opens automatically;

[0115] Part of the medium in the oil inlet channel flows back to the oil outlet channel through the first pressure relief valve, quickly reducing the pressure in the oil inlet channel;

[0116] When the pressure in the oil inlet channel drops to a safe value, the first pressure relief valve spring resets and closes, restoring normal oil replenishment and preventing the oil inlet pipe from bursting or the rotor from being damaged due to overpressure.

[0117] IV. System Collaboration Mechanism (Integration of Protection, Functionality, and Security):

[0118] The three core design features mentioned above (corrosion isolation, forward and reverse flow control, and bidirectional pressure relief) are not isolated, but rather form a system effect of "1+1+1>3" through structural coupling, ensuring the long-term stable operation of the oil pump.

[0119] Based on isolation and protection: The "full enclosure + dynamic sealing" of the isolation cover blocks corrosion, ensures that the stator and circuit board are not damaged for a long time, and provides continuous power for forward and reverse drive;

[0120] The core of the one-way valve flow control: the two-way one-way valve accurately controls the flow direction of the medium, avoids "flow disorder" when the forward and reverse directions are reversed, and ensures the conveying efficiency under both working conditions;

[0121] Pressure relief protection ensures safety: The two-way pressure relief valve provides real-time pressure relief for pressure risk points under different operating conditions (forward oil outlet blockage, reverse oil inlet blockage) to eliminate potential safety hazards;

[0122] Double seal reinforcement: The top of the pump cover assembly seals the top of the housing, forming a triple seal with the bottom of the isolation cover to prevent leakage of volatile media such as methanol and ethanol, and avoid mixing with air to avoid safety risks.

[0123] Finally, it should be noted that the above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this invention should be considered within the scope of protection of this invention.

Claims

1. An oil pump suitable for biodiesel, methanol, ethanol, characterized in that, The oil pump comprises a pump cover assembly (1), a circuit board assembly (2), a stator assembly (3), a shell (4), a bottom-opened isolation cover (5), a rotor assembly (6), an oil inlet assembly (7), an oil passing seat (8), an oil inlet seat (10), a first one-way valve (11), a second one-way valve (12), a first pressure relief valve (9) and a second pressure relief valve (13). The shell (4) is a hollow cavity structure, the stator assembly (3) is arranged inside the shell (4), the circuit board assembly (2) is electrically connected with the stator assembly (3), and the circuit board assembly (2) is provided with a power supply copper piece. The isolation cover (5) is wrapped around the outer periphery of the rotor assembly (6), and the bottom is sealed with the top of the oil passing seat (8) through a sealing structure, so that the stator assembly (3), the power supply copper piece, the oil inlet assembly (7), the oil passing seat (8) and the oil inlet seat (10) are completely isolated from the oil passing channel. The rotor assembly (6) is arranged in the oil passing channel and correspondingly matched with the stator assembly (3) to realize driving rotation. The oil inlet end (26) of the oil inlet seat (10), the oil passing seat (8) and the rotor assembly (6) form an oil inlet channel (21), and the oil outlet end (27) of the oil inlet seat (10), the oil passing seat (8) and the rotor assembly (6) form an oil outlet channel (22). The oil inlet assembly (7) is communicated with the oil passing seat (8). The first one-way valve (11) is arranged at the oil outlet end (27) of the oil inlet seat (10), the flow direction of the first one-way valve (11) is out of the oil inlet seat (10), the first pressure relief valve (9) is arranged on the oil outlet channel (22), one end of the first pressure relief valve (9) is communicated with the oil outlet channel (22), and the other end is communicated with the oil inlet channel (21). The second one-way valve (12) is arranged on the oil inlet seat (10) and communicated with the oil outlet channel (22), the flow direction of the second one-way valve (12) is into the oil outlet channel (22), and the second pressure relief valve (13) is arranged in the oil inlet seat (10). One end of the second pressure relief valve (13) is communicated with the oil inlet end (26) of the oil inlet seat (10), and the other end is communicated with the oil outlet channel (22). The pump cover assembly (1) covers the top opening end of the shell (4) to realize overall sealing.

2. An oil pump suitable for biodiesel, methanol, ethanol according to claim 1, characterized in that, When the rotor assembly (6) rotates forward, the oil pump realizes forward oil pumping, and when the rotor assembly (6) rotates reversely, the oil pump realizes oil supplementing.

3. An oil pump suitable for biodiesel, methanol, ethanol according to claim 2, characterized in that, When the oil pump pumps oil forward, if the oil outlet end (27) of the oil inlet seat (10) is blocked to cause the pressure of the oil outlet channel (22) to be too large, the second pressure relief valve (13) will relieve the pressure of the oil outlet channel (22) to return part of the medium in the oil outlet channel (22) to the oil inlet channel (21).

4. An oil pump suitable for biodiesel, methanol, ethanol as claimed in claim 2, wherein, When the oil pump supplements oil, if the oil inlet end (26) of the oil inlet seat (10) is blocked to cause the pressure of the oil inlet channel (21) to be too large, the first pressure relief valve (9) will relieve the pressure of the oil inlet channel (21) to return part of the medium in the oil inlet channel (21) to the oil outlet channel (22).

5. The oil pump suitable for biodiesel, methanol, ethanol as claimed in claim 1 wherein, The sealing structure comprises a sealing ring (23) radially extending outward from the bottom of the isolation cover (5), an annular sealing groove (24) arranged on the top of the oil passage seat (8), and a sealing ring (25) matched and arranged in the annular sealing groove (24).

6. An oil pump suitable for biodiesel, methanol, ethanol according to any one of claims 1-4, characterized in that, The isolation cover (5) is made of stainless steel, and the thickness of the isolation cover (5) is 3-5 mm.

7. An oil pump suitable for biodiesel, methanol, ethanol according to claim 6, characterized in that, The first pressure relief valve (9) and the second pressure relief valve (13) are both spring type pressure relief valves, and the preset pressure relief pressure is 0.6-1.0 MPa.

8. An oil pump suitable for biodiesel, methanol, ethanol according to claim 7, characterized in that, The first one-way valve (11) and the second one-way valve (12) are both ball one-way valves, and the plugs are made of fluorine rubber.

9. An oil pump suitable for biodiesel, methanol, ethanol as claimed in claim 7, wherein, The first one-way valve (11) and the second one-way valve (12) are both flat sealing one-way valves, and the plugs are made of fluorine rubber.

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