A start-stop oil pump

Abstract

The application relates to a start-stop oil pump and belongs to the technical field of automobile oil pumps. The start-stop oil pump comprises a pump body and a base, the base is provided with an oil outlet pipe and an oil inlet pipe which are communicated with the pump body, further comprises a pretreatment mechanism arranged between the oil inlet pipe and the pump body, a gum collecting mechanism arranged in the pump body and a gum adsorption mechanism arranged between the oil outlet pipe and the pump body, and the pretreatment mechanism comprises a crushing assembly for crushing gum and a temperature control adjusting assembly for adjusting the flow of the oil inlet. The application reduces the influence of gum on the oil pump.

Description

Technical Field

[0001] The present application relates to the technical field of automobile oil pumps, and in particular to a start-stop oil pump. Background Art

[0002] The engine idle start-stop oil pump is the core component of the idle start-stop system. Its function is to maintain stable oil pressure during frequent engine starts and stops, ensuring immediate response of the lubrication and hydraulic systems.

[0003] The Chinese invention patent with the publication number CN108533431A discloses an engine idle start-stop system oil pump, which includes a base, a pump body and a rear cover. The pump body is connected to the base and the rear cover. The base is provided with an oil outlet and an oil inlet. The pump body includes a housing, a motor, a pump core outer rotor and a pump core inner rotor. The pump core inner rotor is eccentrically connected to the motor so that the pump core outer rotor and the pump core inner rotor are eccentrically engaged.

[0004] Regarding the above-mentioned engine start-stop oil pump, due to incomplete combustion of the oil pump at idle speed, fuel colloid remains in the oil inlet filter, resulting in reduced volumetric efficiency. Summary of the Invention

[0005] In order to reduce the impact of colloid on the oil pump, the present application provides a start-stop oil pump.

[0006] The application provides a start-stop oil pump adopting the following technical solution:

[0007] A start-stop oil pump, wherein the base has an oil outlet pipe and an oil inlet pipe connected to the pump body, and is characterized in that it also includes a pretreatment mechanism arranged between the oil inlet pipe and the pump body, a colloid collection mechanism arranged in the pump body, and a colloid adsorption mechanism arranged between the oil outlet pipe and the pump body, the pretreatment mechanism includes a crushing component for crushing the colloid and a temperature control adjustment component for adjusting the flow rate of the oil inlet.

[0008] By adopting the above technical solution, the pretreatment mechanism can pre-treat the fuel entering the pump body, crush the colloid in the fuel and adjust the oil inlet amount according to the fuel temperature. The crushed colloid enters the pump body and is collected by the colloid collection mechanism. Finally, a colloid adsorption mechanism is set at the oil outlet to absorb the unprocessed colloid in the fuel, further reducing the colloid content in the fuel and improving the volumetric efficiency and working stability of the start-stop oil pump.

[0009] Optionally, the crushing assembly includes a contraction portion, a throat portion and a diffusion portion in sequence along the fuel delivery direction, the contraction portion connects the throat portion and the oil inlet pipe, and the inner diameter of the contraction portion gradually decreases from the oil inlet pipe to the throat portion, and the inner diameter of the diffusion portion gradually expands from the throat portion to the pump body, and a return pipe is also provided on the throat portion, the other end of the return pipe is connected to the diffusion portion, and a one-way valve body is provided on the return pipe, through which the fuel in the return pipe flows into the diffusion portion in one direction.

[0010] By adopting the above technical solution, the inner diameter of the contraction part gradually decreases from the oil inlet pipe to the throat part, which can accelerate the fuel flow rate. The inner diameter of the diffusion part gradually expands from the throat part to the pump body, which can restore the fuel pressure smoothly. The fuel flows at high speed in the throat part to generate negative pressure. The return pipe and the one-way valve body arranged in the throat part allow the low-speed fuel to flow into the diffusion part in one direction through the return pipe. A speed difference is formed between the low-speed fuel and the high-speed fuel in the diffusion part. After the two fuel streams come into contact, a turbulent flow is formed, which can break the colloid in the fuel and prevent the colloid from clogging the oil inlet filter. At the same time, it is convenient for the subsequent colloid collection mechanism to work.

[0011] Optionally, an arc-shaped connecting portion is provided at the end of the return pipe, and the arc-shaped connecting portion is evenly arranged along the axis of the diffuser portion. The diffuser portion is provided with an arc-shaped through hole for sealing and installing the arc-shaped connecting portion.

[0012] By adopting the above technical solution, the contact area between the return pipe and the diffuser can be made larger, further increasing the shear force effect and ensuring that the colloid in the fuel is broken into small blocks.

[0013] Optionally, the temperature control and adjustment component includes a temperature sensor for detecting the fuel temperature, a cooling copper tube mounted on the return pipe, and an expansion piece arranged at the inlet of the return pipe. One end of the cooling copper tube is provided with a control valve for connecting to the engine air cooling system, and the opening and closing of the control valve is controlled by the temperature sensor.

[0014] By adopting the above technical solution, the temperature sensor can detect the fuel temperature and control the opening and closing of the control valve connected to the engine air cooling system based on the detection result. When the temperature is high, the valve is opened to allow the cooling copper tube to cool the fuel in the return pipe; the expansion piece arranged at the inlet of the return pipe cooperates with the cooling function and can adjust the flow at the inlet of the return pipe by changing the degree of expansion as the temperature changes to ensure the magnitude of the shear force.

[0015] Optionally, a plurality of semicircular protrusions are arranged at intervals in the throat portion.

[0016] By adopting this technical solution, the semicircular protrusions disrupt the laminar flow of the fluid, causing turbulence. In this turbulent state, the velocity gradient distribution within the fluid becomes more complex and intense. This allows normal fuel delivery to generate a certain amount of shear force even when the flow velocity in the throat does not reach the level that generates negative pressure.

[0017] Optionally, the colloid collection mechanism includes a first filter cylinder arranged in the pump body, a collection base for collecting colloid, and a partition plate isolating the collection base and the fuel, the first filter cylinder is arranged on the outside of the rotor, and the collection base is arranged on the side of the first filter cylinder away from the oil inlet.

[0018] By adopting the above technical solution, a first filter cylinder is set in the pump body to filter the colloid in the fuel, and the filtered colloid is collected by the collecting base. The partition plate can isolate the collecting base and the fuel, reducing the impact of the colloid on the fuel, thereby improving the volumetric efficiency of the oil pump.

[0019] Optionally, the first filter cylinder is provided with an inclined surface on the side facing the collecting base to guide the colloid to slide down, the collecting base has a collecting groove corresponding to the bottom of the inclined surface, the partition plate is provided at the opening of the collecting groove, and micropores are spaced apart on the partition plate.

[0020] By adopting the above technical solution, the inclined surface can be used to guide the colloid on the first filter cylinder to the collection tank. At the same time, the partition plate and the partition micropores thereon can effectively isolate the collection base from the fuel, accurately collect the colloid, and prevent it from mixing into the fuel again and affecting the performance of the oil pump.

[0021] Optionally, the colloid collector further includes an absorption component, which includes a vacuum pump and a suction tube connecting the vacuum pump and the collection tank.

[0022] By adopting the above technical solution and using the absorption component consisting of a vacuum pump and a suction tube, the colloid collected in the collection tank can be effectively removed, thereby preventing the accumulation of colloid from affecting the normal operation of the oil pump and further improving the working stability of the oil pump.

[0023] Optionally, the colloid adsorption mechanism includes a connecting tube, an anti-sticking spiral sheet arranged in the connecting tube, and a strong magnetic ring arranged at intervals at the end of the connecting tube.

[0024] By adopting the above technical solution, the anti-stick spiral sheet can prevent the colloid from adhering to the inner wall of the connecting pipe, while allowing the fuel to be spirally transported. The strong magnetic ring can absorb the colloid and reduce the outflow of the colloid with the fuel, thereby improving the working performance of the start-stop oil pump.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] The crushing components of the pre-treatment mechanism crush the colloid to avoid the colloid residue clogging the oil inlet filter, which can improve the volumetric efficiency of the oil pump;

[0027] The temperature control assembly can adjust the oil inlet flow, helping to maintain stable oil pressure, ensuring engine lubrication and timely response of the hydraulic system;

[0028] The colloid collection mechanism and the colloid adsorption mechanism collect and adsorb colloid respectively, further preventing the colloid from affecting the normal operation of the oil pump, extending the service life of the oil pump and reducing vehicle maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is an overall cross-sectional schematic diagram of an embodiment of the present application.

[0030] Figure 2 It is a cross-sectional schematic diagram of the pretreatment mechanism of an embodiment of the present application.

[0031] Figure 3 It is a structural schematic diagram of the connection between the return pipe and the diffuser in an embodiment of the present application.

[0032] Figure 4 It is a partial cross-sectional schematic diagram of the return pipe of an embodiment of the present application.

[0033] Figure 5 It is a cross-sectional schematic diagram of the colloid collection mechanism in the pump body of the embodiment of the present application.

[0034] Figure 6 It is a structural schematic diagram of the colloid adsorption mechanism of an embodiment of the present application.

[0035] Explanation of reference numerals: 1. Pump body; 11. Mounting surface; 12. Mounting ring groove; 13. Sealing O-ring; 14. Oil inlet; 15. Oil outlet; 2. Base; 21. Oil inlet pipe; 22. Oil outlet pipe; 3. Pretreatment mechanism; 31. Crushing assembly; 311. Contraction portion; 312. Throat portion; 3121. Semicircular protrusion; 313. Diffuser; 3131. Arc-shaped through hole; 314. Return pipe; 3141. Arc-shaped connecting portion; 3142. Spiral arc piece; 315. Single Toward the valve body; 32. Temperature control adjustment component; 321. Temperature sensor; 322. Cooling copper tube; 323. Expansion piece; 3231. Metal sheet; 4. Colloid collection mechanism; 41. First filter cylinder; 411. Inclined surface; 42. Collection base; 421. Collection tank; 43. Partition plate; 431. Partition micropores; 44. Absorption component; 441. Vacuum pump; 442. Suction tube; 5. Colloid adsorption mechanism; 51. Connecting pipe; 52. Anti-sticking spiral sheet; 53. Strong magnetic ring. DETAILED DESCRIPTION

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0037] The following is combined with Figure 1-6 This application is described in further detail.

[0038] An embodiment of the present application discloses a start-stop oil pump.

[0039] Reference Figure 1 The start-stop oil pump includes a pump body 1 and a base 2. The base 2 is fixed to one end of the pump body 1 by bolts. The end surface where the pump body 1 and the base 2 are mounted is defined as the mounting surface 11. The pump body 1 is provided with a mounting ring groove 12 on the mounting surface 11, and a sealing O-ring 13 is installed in the mounting ring groove 12. The pump body 1 is provided with an oil inlet 14 and an oil outlet 15 on the mounting surface 11. The base 2 has an oil inlet pipe 21 and an oil outlet pipe 22 corresponding to the oil inlet 14 and the oil outlet 15, respectively.

[0040] In order to reduce the impact of colloid in the fuel on the oil pump, the start-stop oil pump further includes a pre-treatment mechanism 3, a colloid collection mechanism 4 and a colloid adsorption mechanism 5.

[0041] Reference Figure 1 and Figure 2 The pretreatment mechanism 3 is located entirely between the fuel inlet pipe 21 and the fuel inlet port 14 and includes a crushing assembly 31 and a temperature control assembly 32. The crushing assembly 31 comprises, along the fuel delivery direction, a contraction portion 311, a throat portion 312, and a diffuser 313. These portions are all integrally formed from stainless steel, capable of withstanding long-term fuel corrosion and ensuring the service life of the pipeline. The inner wall of the pipeline is also polished to reduce the probability of colloid adhesion and accumulation.

[0042] The contraction portion 311 connects the oil inlet pipe 21 and the throat portion 312. The inner diameter of the contraction portion 311 gradually decreases from the oil inlet pipe 21 to the throat portion 312. In this embodiment, the acute angle between the inner wall of the contraction portion 311 and its axis is 20°. The inlet diameter of the contraction portion 311 near the oil inlet pipe 21 is D, and the outlet diameter of the contraction portion 311 near the throat portion 312 is 2 / D.

[0043] The throat section 312 connects the oil inlet pipe 21 and the diffusion section 313, and is a uniformly extending cylindrical pipe. The diameter of the throat section 312 is the same as the diameter of the outlet of the oil inlet pipe, and the length of the throat section 312 is 1.5 times the diameter of the throat section, i.e. 0.75D. The inner wall of the throat section 312 is provided with a plurality of semicircular protrusions 3121 along the axial direction, so that obvious turbulent flow is generated when the fuel flows at high speed in the throat section 312.

[0044] The diffusion section 313 connects the throat section 312 and the oil inlet 14, and the inner diameter of the diffusion section 313 gradually increases from the throat section 312 to the oil inlet 14. In the embodiment, the acute angle between the inner wall of the diffusion section 313 and the axial line is 10°. The inlet diameter of the diffusion section 313 is 2 / D, and the outlet diameter is D.

[0045] When the fuel is delivered from the oil inlet pipe 21 to the oil inlet 14, the flow rate of the fuel increases and the static pressure gradually decreases in the contraction section 311 due to the arrangement of the breaking assembly 31, the maximum flow rate and the minimum static pressure are reached in the throat section 312, and then the flow rate gradually decreases in the diffusion section 313. When the fuel passes through the semicircular protrusions 3121 in the throat section 312, the semicircular protrusions 3121 disturb the flow of the fuel and generate turbulent flow, and the shear force is generated in the fuel under the turbulent flow state, which has a certain breaking effect on the gum in the fuel.

[0046] In order to further improve the shear force in the fuel, the throat section 312 is further provided with a return pipe 314, and the other end of the return pipe 314 is connected to the diffusion section 313. Due to the reduction of the flow area in the throat section 312, the flow rate is sharply increased, the pressure of the fluid close to the wall is reduced, and negative pressure is generated, so that the low-speed fuel flows back to the diffusion section 313 through the return pipe 314. The low-speed fuel and the high-speed fuel in the diffusion section 313 are mixed, and the cross-flow shear effect is formed by the speed difference between the two, so as to improve the breaking effect on the gum. The return pipe 314 is provided with a one-way valve 315, so that the fuel in the return pipe 314 flows into the diffusion section 313 in one direction. In the embodiment, the one-way valve 315 is a ball valve structure, and the return pipe 314 is provided with a filter screen at the inlet, which is used to reduce the probability of gum entering the return pipe 314 and causing blockage.

[0047] Referring to Figure 2 and Figure 3The diameter of the return pipe 314 is 1 / 5-1 / 3 the diameter of the throat pipe. Its ends are connected to the middle of the throat pipe 312 and the middle of the diffuser 313, respectively. A curved connecting portion 3141 is provided at the end of the return pipe 314 near the diffuser 313. The diffuser 313 has curved through-holes 3131 corresponding to the curved connecting portion 3141. The curved through-holes 3131 are evenly spaced along the circumference of the diffuser. The curved connecting portions 3141 are angled at a 45-60° angle to connect to the curved through-holes 3131, creating an oblique counteraction with the fuel in the diffuser 313, thereby expanding the range of shear force.

[0048] Reference Figure 2 and Figure 4 The inner wall of the return pipe 314 is also provided with multiple groups of spiral arc sheets 3142 at intervals. The multiple groups of spiral arc sheets 3142 are spirally arranged at intervals along the axis of the return pipe 314, so that the fuel in the return pipe 314 forms a spiral fluid, thereby improving the crushing efficiency.

[0049] The temperature control assembly 32 includes a temperature sensor 321, a cooling copper tube 322 that fits over the return pipe 314, and an expansion member 323 located at the outlet of the return pipe 314. The temperature sensor 321 is fixedly mounted on the outer wall of the return pipe 314 and is used to monitor the fuel temperature at the opening of the return pipe 314. One end of the cooling copper tube 322 is connected to the engine's air cooling system, and multiple cooling air vents are spaced apart on the inner wall of the return pipe 314. A control valve 324 is located between the cooling copper tube 322 and the air cooling system, and its opening and closing are controlled by the temperature sensor 321.

[0050] When the vehicle's speed exceeds 30 km / h, the engine starts the air cooling system, the fuel temperature rises, and the temperature sensor 321 controls the connection between the cooling copper tube 322 and the air cooling system, so that part of the cooling air is delivered to the cooling copper tube 322. The cooling air is output from the cooling air outlet to cool the fuel in the return pipe 314, ensuring that the low-speed fuel is stably injected into the diffuser 313.

[0051] The expansion member 323 includes two sets of symmetrically arranged metal sheets 3231, each made of a shape memory alloy. The metal sheets 3231 are rotatably mounted on the inner wall of the return pipe 314, with the rotation axis of the metal sheets 3231 perpendicular to the axis of the return pipe 314. The rotation of the metal sheets 3231 is controlled by the temperature within the return pipe 314. Under normal conditions, the two metal sheets 3231 are arranged at an angle. When the temperature within the return pipe 314 exceeds 80°, the metal sheets 3231 rotate to close the inner hole of the return pipe 314. As the temperature of the return pipe 314 decreases due to the cooling copper tube 322, the metal sheets 3231 gradually rotate open, reopening the return pipe 314.

[0052] Reference Figure 5The colloid collection mechanism 4 is disposed within the pump body 1 and is used to collect and process the crushed colloid. The colloid collection mechanism 4 includes a first filter cartridge 41, a collection base 42, and a partition plate 43. The first filter cartridge 41 is disposed outside the stator, and one end of the first filter cartridge 41 is rotatably connected to the top of the pump body 1 cover. The pump body 1 cover has a bearing that rotatably cooperates with the first filter cartridge 41. Under the action of centrifugal force, the colloid adheres to the first filter cartridge 41, and the fuel circulates through the first filter cartridge 41.

[0053] The collection base 42 is positioned below the first filter cartridge 41. A collection trough 421 for the colloid to enter is defined at the top of the collection base 42. This trough 421 corresponds to the bottom of the first filter cartridge 41. An inclined surface 411 is positioned on the inside of the first filter cartridge 41 at a 10° angle, allowing any colloid adhering to the first filter cartridge 41 to automatically fall into the collection trough 421 under the action of gravity.

[0054] A partition plate 43 is positioned inside the top opening of the collection tank 421 and is arranged at an angle. An array of micropores 431 are formed on the partition plate 43 to prevent fuel from entering. The pump body 1 also has an absorption assembly 44 at its bottom, away from the mounting surface 11. This assembly includes a vacuum pump 441 and a suction pipe 442. The two ends of the suction pipe 442 connect the vacuum pump 441 to the bottom of the collection base 42, respectively.

[0055] Reference Figure 6 The colloid adsorption mechanism 5 is arranged between the oil outlet pipe 22 and the oil outlet 15, and includes a connecting pipe 51, an anti-sticking spiral sheet 52 and a strong magnetic ring 53. The connecting pipe 51 connects the oil outlet pipe 22 and the oil outlet 15, and the anti-sticking spiral sheet 52 is arranged at intervals along the axial direction of the connecting pipe 51. The anti-sticking spiral sheet 52 is coated with an anti-sticking layer to reduce the probability of colloid adhering to the inner wall of the connecting pipe 51. Through the setting of the anti-sticking spiral sheet 52, the fuel output from the oil outlet 15 can be transported in a spiral manner to generate turbulence. The strong magnetic ring 53 is arranged at intervals on the side of the connecting pipe 51 away from the oil outlet 15 to adsorb excess colloid in the fuel.

[0056] The implementation principle of a start-stop oil pump in an embodiment of the present application is as follows: after the start-stop oil pump is turned on, fuel is input from the oil inlet pipe 21, and the input fuel is initially crushed under the action of the pretreatment mechanism 3. When the temperature of the return pipe 314 rises to a certain temperature, the expansion piece 323 automatically deforms to close the inner hole of the return pipe 314; the fuel enters the pump body 1 through the oil inlet 14, and the fuel rotates in the pump body 1, and the colloid is collected by the colloid collection mechanism 4 provided in the pump body 1; the fuel is output from the oil outlet 15, passes through the colloid adsorption mechanism 5, and adsorbs the colloid that has not been collected in the fuel.

[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A start-stop oil pump, comprising a pump body (1) and a base (2), wherein the base (2) has an oil outlet pipe (22) and an oil inlet pipe (21) connected to the pump body (1), characterized in that: It also includes a pre-treatment mechanism (3) arranged between the oil inlet pipe (21) and the pump body (1), a colloid collection mechanism (4) arranged in the pump body (1), and a colloid adsorption mechanism (5) arranged between the oil outlet pipe (22) and the pump body (1), wherein the pre-treatment mechanism (3) includes a crushing component (31) for crushing the colloid and a temperature control adjustment component (32) for adjusting the flow rate of the oil inlet (14); The crushing assembly (31) includes a contraction portion (311), a throat portion (312), and a diffusion portion (313) in sequence along the fuel delivery direction. The contraction portion (311) is connected to the throat portion (312) and the fuel inlet pipe (21). The inner diameter of the contraction portion (311) gradually decreases from the fuel inlet pipe (21) to the throat portion (312). The inner diameter of the diffusion portion (313) gradually increases from the throat portion (312) to the pump body (1). A return pipe (314) is further provided on the throat portion (312). The other end of the return pipe (314) is connected to the diffusion portion (313). A one-way valve body (315) is provided on the return pipe (314). The one-way valve body (315) allows the fuel in the return pipe (314) to flow into the diffusion portion (313) in one direction. The colloid collection mechanism (4) comprises a first filter cylinder (41) arranged in the pump body (1), a collection base (42) for collecting colloid, and a partition plate (43) isolating the collection base from the fuel, wherein the first filter cylinder (41) is arranged outside the rotor, and the collection base (42) is arranged on a side of the first filter cylinder (41) away from the fuel inlet (14); The colloid adsorption mechanism (5) comprises a connecting tube (51), an anti-sticking spiral sheet (52) arranged in the connecting tube (51), and a strong magnetic ring (53) arranged at intervals at the end of the connecting tube (51).

2. A start-stop oil pump according to claim 1, characterized in that: An arc-shaped connecting portion (3141) is provided at the end of the return pipe (314), and the arc-shaped connecting portion (3141) is evenly arranged along the axis of the diffuser (313). The diffuser (313) is provided with an arc-shaped through hole (3131) for sealing and mounting the arc-shaped connecting portion (3141).

3. A start-stop oil pump according to claim 2, characterized in that: The temperature control and adjustment component (32) includes a temperature sensor (321) for detecting the fuel temperature, a cooling copper tube (322) sleeved on the return pipe (314), and an expansion member (323) arranged at the inlet of the return pipe (314). One end of the cooling copper tube (322) is provided with a control valve for communicating with the engine air cooling system, and the opening and closing of the control valve is controlled by the temperature sensor (321).

4. A start-stop oil pump according to claim 2, characterized in that: A plurality of semicircular protrusions (3121) are arranged at intervals in the throat portion (312).

5. The start-stop oil pump according to claim 1, characterized in that: The first filter cylinder (41) is provided with an inclined surface (411) on one side facing the collecting base (42) for guiding the colloid to slide down. The collecting base (42) has a collecting groove (421) corresponding to the bottom of the inclined surface (411). The partition plate (43) is obliquely arranged at the opening of the collecting groove (421). The partition plate (43) is provided with partition micropores (431) at intervals.

6. The start-stop oil pump according to claim 5, characterized in that: The colloid collection mechanism (4) further comprises an absorption component (44), wherein the absorption component (44) comprises a vacuum pump (441) and a suction tube (442) connecting the vacuum pump (441) and the collection tank (421).

Images