Fuel pump support assembly capable of preventing backflow and supplying fuel as required

Abstract

The utility model discloses a fuel pump support assembly capable of preventing backflow and supplying oil as required, which relates to the technical field of fuel pump support assembly parts and comprises a top cover component, an oil pump support component and a pressure regulating valve. A three-way plastic seat used for installing a pressure regulating valve is arranged between the top cover assembly and the oil pump support assembly, the three-way plastic seat is provided with three-end oil nozzles, namely an oil outlet nozzle, an oil inlet nozzle and an injection nozzle, the tail end of the oil inlet nozzle is provided with a flow dividing spray hole, the flow dividing spray hole is communicated with the injection nozzle, and the injection nozzle is communicated with the top cover assembly. The inner diameter of the end, close to the injection oil nozzle, of the flow dividing spray hole is smaller than the inner diameter of the end, close to the oil inlet oil nozzle, of the flow dividing spray hole, the oil outlet oil nozzle is provided with a one-way valve assembly, and the injection oil nozzle is communicated with a pressure relief opening of the pressure regulating valve. The variable pressure requirement of the on-demand oil supply system under variable voltage can be met, backflow is prevented, and fuel consumption and tail gas emission during idling time are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel pump bracket assembly parts, in particular to a fuel pump bracket assembly which can prevent backflow and supply oil on demand. Background Art

[0002] The automobile fuel pump assembly is one of the basic components of the automobile fuel injection system. Its function is to suck fuel out of the fuel tank and the fuel pressure regulating valve cooperates synchronously to establish a certain fuel pressure. After pressurization, the fuel is delivered to the fuel supply pipeline for the normal operation of the engine.

[0003] At present, people's ideology of protecting ecological environment and saving energy is constantly strengthened. In order to reduce unnecessary fuel consumption during idling period, reduce emissions and improve fuel economy, more and more models on the market are equipped with engine automatic start-stop system. When the car stops for 1.5 seconds after being put into neutral gear and is in the state of engine idling, the engine will automatically cut off the fuel and shut down. When it needs to be started, the driver can operate the motor reasonably to start the engine quickly, so as to achieve rapid engine start. After the car engine is turned off, the electronic fuel injection system will not stop working, but will automatically adjust to the low-pressure on-demand fuel supply state so that the motor can quickly start the engine next time, realizing seamless and uninterrupted connection, thereby reducing fuel consumption and exhaust emissions during idling time.

[0004] The existing fuel pump bracket assembly uses a pressure valve to control the system pressure, which is only suitable for conventional constant pressure systems and cannot meet the variable pressure requirements of the on-demand fuel supply system under variable voltage. After the automobile engine is turned off, the injection force of the electronic fuel injection system is insufficient, which easily causes the fuel pump to overheat when idling. In addition, the fuel pump bracket assembly with the existing pressure valve assembly causes the unconsumed fuel of the engine to flow back into the oil storage tank, resulting in low fuel utilization, high fuel consumption and exhaust emissions during idling time, and environmental pollution. Summary of the invention

[0005] In view of the deficiencies of the prior art, the utility model provides a fuel pump bracket assembly which can prevent backflow and supply fuel on demand.

[0006] The technical solution provided by the utility model is:

[0007] A fuel pump bracket assembly for preventing backflow and supplying fuel on demand comprises a top cover assembly, a fuel pump bracket assembly and a pressure regulating valve, wherein the top cover assembly is connected to the fuel pump bracket assembly through a support rod, a three-way plastic seat for installing the pressure regulating valve is provided between the top cover assembly and the fuel pump bracket assembly, the three-way plastic seat is provided with three-end oil nozzles, which are respectively an oil outlet nozzle connected to an oil outlet pipe of the top cover assembly, an oil inlet nozzle connected to an oil inlet pipe of the fuel pump bracket assembly, and an injection oil nozzle connected to an injection oil pipe, a diverter spray hole is provided at the end of the oil inlet nozzle, the diverter spray hole is connected to the injection oil nozzle, the inner diameter of the diverter spray hole near the injection oil nozzle end is smaller than the inner diameter near the oil inlet nozzle end, the oil outlet nozzle is provided with a one-way valve assembly, and the injection oil nozzle is communicated with the pressure relief port of the pressure regulating valve.

[0008] The flow-dividing spray hole comprises a section with the same inner diameter and a section with a reduced inner diameter, and the section with the same inner diameter is provided with a copper nozzle.

[0009] The three-way plastic seat is provided with an installation hole for installing the pressure regulating valve, and the installation hole includes a first inner diameter section and a second inner diameter section. The first inner diameter section has a clearance fit with the pressure regulating valve and the outer edge, and the second inner diameter section has an interference fit with the O-ring of the pressure regulating valve.

[0010] A first step surface for positioning and limiting is provided between the first inner diameter section and the second inner diameter section.

[0011] The three-way plastic seat is provided with a fixing mechanism for fixing the pressure regulating valve, and the fixing mechanism comprises a limiting groove provided on the surface of the three-way plastic seat and a steel wire buckle for inserting into the limiting groove and clamping the pressure regulating valve.

[0012] The oil outlet nozzle is provided with a matching section and a mounting section, the matching section is provided with an inclined surface, and the inclined surface forms a contact sealing match with the valve core of the one-way valve assembly.

[0013] The installation section is provided with a second step surface for preventing the one-way valve assembly from moving.

[0014] A matching ring buckle for connecting the support rod is provided on the side of the three-way plastic seat.

[0015] The three-way plastic seat is made of POM copolymer material.

[0016] Beneficial effects of the utility model: the utility model arranges a three-way plastic seat for installing a pressure regulating valve between the top cover assembly and the oil pump bracket assembly, the three-way plastic seat is provided with three oil nozzles, the first oil nozzle can be used to feed oil, the second oil nozzle can continuously spray out oil for injection operation, and the temperature of the fuel pump can be reduced; the third oil nozzle is provided with a one-way valve assembly to supply oil to the engine, and the fuel medium is prevented from flowing back when idling; a diverter spray hole is provided at the end of the oil inlet nozzle, the diverter spray hole is connected to the injection nozzle, the inner diameter of the diverter spray hole near the injection nozzle end is smaller than the inner diameter near the oil inlet nozzle end, and the fuel medium flows from When the fuel inlet nozzle enters the inside of the three-way plastic seat, the fuel medium is diverted through the diverter nozzle. Due to the reduction in the diameter of the diverter nozzle, the high-pressure flow of the extremely fast injection forms an induced ejection effect. At the same time, the induced ejection nozzle is connected to the pressure relief port of the pressure regulating valve. When the pressure regulating valve releases pressure, the medium diverted to the diverter nozzle will increase, and the high-pressure flow of the extremely fast injection will increase again. The fuel pump can continue to spray out the requirements for induced ejection when idling, meeting the variable pressure requirements of the on-demand fuel supply system under variable voltage, reducing fuel consumption and exhaust emissions during idling time, improving economy, and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the explosion structure of an embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of a three-way plastic seat according to an embodiment of the utility model;

[0020] Figure 4 This is a structural schematic diagram of the three-way plastic seat of the utility model embodiment from another angle;

[0021] Figure 5 It is a schematic cross-sectional structure diagram of a three-way plastic seat according to an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1-2 As shown, a fuel pump bracket assembly with anti-backflow and on-demand fuel supply includes a top cover assembly 1, a wire buckle 2, a pressure regulating valve 3, a copper nozzle 4, a three-way plastic seat 5, an oil pump bracket assembly 6, a plastic sleeve cap 7, a one-way valve assembly 8, and an injection oil pipe 9.

[0024] The top cover assembly 1 is connected to the oil pump bracket assembly 6 via a support rod 10. The top cover assembly 1 and the oil pump bracket assembly 6 are prior art and will not be described in detail herein.

[0025] like Figure 3-5As shown, a matching ring buckle 24 is provided on the side of the three-way plastic seat 5, and the three-way plastic seat 5 is sleeved on the support rod 10 through the matching ring buckle 24 to be fixed between the top cover assembly 1 and the oil pump bracket assembly 6. The three-way plastic seat 5 is provided with a mounting hole for mounting the pressure regulating valve 3, and the mounting hole includes a first inner diameter section 51 and a second inner diameter section 52. The first inner diameter section 51 is in a clearance fit with the pressure regulating valve and the outer edge, and the second inner diameter section 52 is in an interference fit with the O-ring of the pressure regulating valve. The pressure relief port of the pressure regulating valve is located at the end of the second inner diameter section 52. A first step surface 53 is provided between the first inner diameter section 51 and the second inner diameter section 52, which is used to position the pressure regulating valve 3 to prevent the pressure regulating valve 3 from moving back and forth after installation. A limiting groove 25 is provided on the surface of the three-way plastic seat 5, and the wire buckle 2 can be inserted into the limiting groove 25 to tighten the pressure regulating valve 3. Since the pressure regulating valve 3 and the three-way plastic seat 5 are sealed, after the medium such as gasoline flows through, the internal matching gap is filled with the medium to form a vacuum, which makes disassembly difficult. The limiting groove 25 can also provide a fulcrum during disassembly, which facilitates the disassembly of the pressure regulating valve 3. During maintenance and replacement, the operating skills of workers are low, and the operation is easy to use and easy to reverse.

[0026] In this embodiment, the three-way plastic seat 5 is provided with a three-end oil nozzle, the first end is an oil outlet nozzle 23 connected to the oil outlet pipe of the top cover assembly 1, the second end is an injection oil nozzle 21 connected to the injection oil pipe 9, and the third end is an oil inlet nozzle 22 connected to the oil inlet pipe of the oil pump bracket assembly 6. A diverter spray hole 26 is provided at the end of the oil inlet nozzle 22, and the diverter spray hole 26 is connected to the injection oil nozzle 21. The diverter spray hole includes a same inner diameter section 261 and an inner diameter reduction section 263. The copper nozzle 4 is arranged at the same inner diameter section 261. The fuel medium is diverted through the copper nozzle 4, and the copper nozzle 4 gathers the diverted fuel medium and pushes the fuel medium to the inner diameter reduction section 263. Due to the reduction of the inner diameter, the high-pressure flow of the extremely fast injection forms an injection effect. At the same time, the injection oil nozzle 21 is connected to the pressure relief port 27 of the pressure regulating valve 3. When the pressure regulating valve 3 is depressurized, the high-pressure flow will increase again, meeting the requirement of continuous spraying for injection operation when the vehicle is idling at low pressure.

[0027] In this embodiment, the oil outlet nozzle 23 is provided with a one-way valve assembly 8, and the oil outlet nozzle 23 is provided with a matching section 231 and a mounting section 233. The matching section 231 is provided with an inclined surface 232, and the inclined surface 232 forms a contact seal with the valve core of the one-way valve assembly. The mounting section 233 is provided with a second step surface 234, which is used to provide positioning when installing the one-way valve assembly, and can prevent the one-way valve assembly from moving after installation. The one-way valve assembly 8 is installed by inserting the one-way valve assembly into the mounting section 233 of the oil outlet nozzle 23, so that its upper end is positioned against the second step surface 234, and then the oil outlet nozzle 23 is closed by a riveting process to prevent the one-way valve assembly 8 from falling out. The one-way valve provided at the oil outlet nozzle 23 can effectively prevent the fuel medium from flowing back when idling.

[0028] In this embodiment, the three-way plastic seat 5 is made of POM copolymer material, which has good dimensional molding stability, high surface hardness, self-lubrication, friction and excellent electrical insulation. It can withstand a variety of conventional fuel media such as methanol gasoline, ethanol gasoline, and ordinary gasoline, and maintain considerable chemical stability at high temperatures. It can cope well with the complex working environment in the automobile fuel tank. The injection-molded three-way plastic seat 5 is firmly installed and can meet the use and installation requirements.

[0029] The embodiments should not be regarded as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.

Claims

1. A fuel pump bracket assembly with anti-backflow and on-demand fuel supply, comprising a top cover assembly, a fuel pump bracket assembly, and a pressure regulating valve, wherein the top cover assembly is connected to the fuel pump bracket assembly through a support rod, and is characterized in that: A three-way plastic seat for installing a pressure regulating valve is provided between the top cover assembly and the oil pump bracket assembly. The three-way plastic seat is provided with three-end oil nozzles, which are respectively an oil outlet nozzle connected to the oil outlet pipe of the top cover assembly, an oil inlet nozzle connected to the oil inlet pipe of the oil pump bracket assembly, and an injection oil nozzle connected to the injection oil pipe. A diverter spray hole is provided at the end of the oil inlet nozzle, and the diverter spray hole is connected to the injection oil nozzle. The inner diameter of the diverter spray hole near the injection oil nozzle end is smaller than the inner diameter near the oil inlet nozzle end. The oil outlet nozzle is provided with a one-way valve assembly, and the injection oil nozzle is communicated with the pressure relief port of the pressure regulating valve.

2. The fuel pump bracket assembly with anti-backflow and on-demand fuel supply according to claim 1 is characterized in that: The flow-dividing spray hole comprises a section with the same inner diameter and a section with a reduced inner diameter, and the section with the same inner diameter is provided with a copper nozzle.

3. The fuel pump bracket assembly with anti-backflow and on-demand fuel supply according to claim 1, characterized in that: The three-way plastic seat is provided with an installation hole for installing the pressure regulating valve, and the installation hole includes a first inner diameter section and a second inner diameter section. The first inner diameter section has a clearance fit with the pressure regulating valve and the outer edge, and the second inner diameter section has an interference fit with the O-ring of the pressure regulating valve.

4. The fuel pump bracket assembly with anti-backflow and on-demand fuel supply according to claim 3 is characterized by: A first step surface for positioning and limiting is provided between the first inner diameter section and the second inner diameter section.

5. The fuel pump bracket assembly with anti-backflow and on-demand fuel supply according to claim 3 is characterized by: The three-way plastic seat is provided with a fixing mechanism for fixing the pressure regulating valve, and the fixing mechanism comprises a limiting groove provided on the surface of the three-way plastic seat and a steel wire buckle for inserting into the limiting groove and clamping the pressure regulating valve.

6. The fuel pump bracket assembly with anti-backflow and on-demand fuel supply according to claim 1, characterized in that: The oil outlet nozzle is provided with a matching section and a mounting section, the matching section is provided with an inclined surface, and the inclined surface forms a contact sealing match with the valve core of the one-way valve assembly.

7. The fuel pump bracket assembly with anti-backflow and on-demand fuel supply according to claim 6, characterized in that: The installation section is provided with a second step surface for preventing the one-way valve assembly from moving.

8. The fuel pump bracket assembly with anti-backflow and on-demand fuel supply according to claim 1, characterized in that: A matching ring buckle for connecting the support rod is provided on the side of the three-way plastic seat.

9. The fuel pump bracket assembly with anti-backflow and on-demand fuel supply according to claim 1, characterized in that: The three-way plastic seat is made of POM copolymer material.

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