A fuel pump assembly simultaneously integrating pressure relief and pressure maintenance functions

Abstract

The utility model relates to a fuel pump assembly with integrated pressure relief and pressure maintaining functions, belonging to the field of fuel pumps, comprising a pump core, the oil outlet end of the pump core being connected with an engine, a pressure regulating valve and a pressure relief valve. When the pressure relief valve is opened during operation, it does not affect the normal operation of the fuel pump. When the vehicle is stopped, the flow passage pressure is released from the check valve under the action of system pressure in a short time, so that the pipeline is rapidly pressure relieved. When the flow passage pressure is reduced to be insufficient to overcome the spring force, the check valve is closed.

Description

Technical Field

[0001] This utility model relates to the field of fuel pumps, and in particular to a fuel pump assembly that integrates both pressure relief and pressure holding functions. Background Technology

[0002] Traditional fuel pump assemblies only integrate valves with one-way pressure holding functions. As customers have increasingly higher requirements for vehicle safety, when the vehicle is parked, if the fuel line is accidentally damaged or broken, the large pressure release in the line will result in more fuel injection and splashing. When the vehicle is parked, the fuel line is subjected to greater pressure, which reduces the life of the line and poses a safety hazard. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a fuel pump assembly that integrates pressure relief and pressure holding functions. When running, the pressure relief valve opens without affecting the normal operation of the fuel pump. When stopped, under the action of system pressure, the flow channel pressure is released from the check valve in a short time, allowing the pipeline to depressurize quickly. When the flow channel pressure drops to a level that is insufficient to overcome the spring force, the check valve closes.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a fuel pump assembly that integrates pressure relief and pressure holding functions, including a pump core, wherein the oil outlet end of the pump core is connected to an engine, a pressure regulating valve and a pressure relief valve.

[0005] Preferably, the oil outlet end of the pump core is connected to the engine, the pressure regulating valve, and the pressure relief valve respectively via oil pipes.

[0006] Preferably, the oil pipe includes a main pipe, an oil outlet branch pipe, a pressure regulating branch pipe, and a pressure relief branch pipe. One end of the main pipe is connected to the oil outlet end of the pump core, and the other end of the main pipe is connected to one end of the oil outlet branch pipe, the pressure regulating branch pipe, and the pressure relief branch pipe, respectively. The other end of the oil outlet branch pipe is connected to the engine, the other end of the pressure regulating branch pipe is connected to the pressure regulating valve, and the other end of the pressure relief branch pipe is connected to the pressure relief valve.

[0007] Preferably, the pressure regulating valve has a pressure relief gap at its sealing point.

[0008] Preferably, the pressure relief valve includes a valve chamber, a diaphragm, a valve seat, a spring, and a valve ball;

[0009] The valve chamber is divided into an air chamber and an oil chamber by the diaphragm. The air chamber is connected to the intake manifold. The oil chamber is provided with an oil inlet and an oil outlet. The valve seat is provided with the oil outlet. The valve ball is provided on the valve seat corresponding to the oil outlet. The air chamber is provided with a spring. The spring pushes the valve seat to make the valve ball block the oil outlet. The pressure relief gap is provided between the valve ball and the oil outlet.

[0010] Preferably, the surface roughness on both sides of the pressure relief gap is 70-73 μm. Increasing the roughness of the pressure regulating valve seal creates a micro-leakage, allowing for slow pressure relief. When the system pressure drops sufficiently, it achieves a pressure-holding effect.

[0011] Preferably, the surface roughness on both sides of the pressure relief gap is 72 μm.

[0012] The beneficial effects of this utility model are as follows: When the pressure relief valve is open during operation, it does not affect the normal operation of the fuel pump. When the vehicle is stopped, under the action of system pressure, the flow channel pressure is released from the check valve in a short time, allowing the pipeline to depressurize quickly. When the flow channel pressure drops to a level insufficient to overcome the spring force, the check valve closes. Increasing the roughness of the pressure regulating valve seal creates a micro-leakage, allowing for slow pressure relief. When the system pressure drops to a sufficiently low level, it achieves a pressure-holding effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of a pressure relief valve;

[0015] The components include: pump core 1, oil pipe 2, oil outlet branch pipe 3, pressure relief branch pipe 4, pressure regulating branch pipe 5, pressure relief valve 6, pressure regulating valve 7, air chamber 8, oil chamber 9, diaphragm 10, oil outlet 11, valve seat 12, valve ball 13, and spring 14. Detailed Implementation

[0016] To enhance understanding of this utility model, it will be described in further detail below with reference to the accompanying drawings and embodiments. These embodiments are only used to explain this utility model and do not limit the scope of protection of this utility model. Example

[0017] A fuel pump assembly that integrates both pressure relief and pressure holding functions includes a pump core 1, the oil outlet of which is connected to an engine, a pressure regulating valve 7, and a pressure relief valve 6.

[0018] The oil outlet of the pump core 1 is connected to the engine, the pressure regulating valve 7, and the pressure relief valve 6 via the oil pipe 2.

[0019] The oil pipe 2 includes a main pipe, an oil outlet branch pipe 3, a pressure regulating branch pipe 5, and a pressure relief branch pipe 4. One end of the main pipe is connected to the oil outlet end of the pump core 1, and the other end of the main pipe is connected to one end of the oil outlet branch pipe 3, the pressure regulating branch pipe 5, and the pressure relief branch pipe 4, respectively. The other end of the oil outlet branch pipe 3 is connected to the engine, the other end of the pressure regulating branch pipe 5 is connected to the pressure regulating valve 7, and the other end of the pressure relief branch pipe 4 is connected to the pressure relief valve 6.

[0020] The pressure regulating valve 7 has a pressure relief gap at its sealing point.

[0021] The pressure relief valve 6 includes a valve chamber, a diaphragm 10, a valve seat 12, a spring 14, and a valve ball 13. The valve chamber is divided into an air chamber 8 and an oil chamber 9 by the diaphragm 10. The air chamber 8 is connected to the intake manifold. The oil chamber 9 is provided with an oil inlet and an oil outlet 11. The valve seat 12 is provided with the oil outlet 11. The valve ball 13 is provided on the valve seat 12 corresponding to the oil outlet 11. The air chamber 8 is provided with a spring 14. The spring 14 pushes the valve seat 12 to make the valve ball 13 block the oil outlet 11. The pressure relief gap is provided between the valve ball 13 and the oil outlet 11.

[0022] The surface roughness on both sides of the pressure relief gap is 72 μm.

[0023] The beneficial effects of this utility model are as follows: When the pressure relief valve 6 is open during operation, it does not affect the normal operation of the fuel pump. When the vehicle is stopped, under the action of system pressure, the flow channel pressure is released from the check valve in a short time, which makes the pipeline depressurize quickly. When the flow channel pressure drops to a level that is insufficient to overcome the force of the spring 14, the check valve closes. The roughness of the sealing part of the pressure regulating valve 7 is increased to form a micro-leakage and slowly depressurize. When the system pressure drops to a sufficiently low level, the pressure holding effect is achieved.

[0024] The above embodiments should not limit the present invention in any way. All technical solutions obtained by equivalent substitution or equivalent conversion fall within the protection scope of the present invention.

Claims

1. A fuel pump assembly that integrates both pressure relief and pressure holding functions, characterized in that, Includes a pump core, the oil outlet of which is connected to an engine, a pressure regulating valve, and a pressure relief valve; The oil outlet of the pump core is connected to the engine, pressure regulating valve, and pressure relief valve respectively via oil pipes; The oil pipe includes a main pipe, an oil outlet branch pipe, a pressure regulating branch pipe, and a pressure relief branch pipe. One end of the main pipe is connected to the oil outlet end of the pump core, and the other end of the main pipe is connected to one end of the oil outlet branch pipe, the pressure regulating branch pipe, and the pressure relief branch pipe, respectively. The other end of the oil outlet branch pipe is connected to the engine, the other end of the pressure regulating branch pipe is connected to the pressure regulating valve, and the other end of the pressure relief branch pipe is connected to the pressure relief valve.

2. The fuel pump assembly that integrates pressure relief and pressure holding functions according to claim 1, characterized in that, The pressure regulating valve has a pressure relief gap at its sealing point.

3. A fuel pump assembly integrating pressure relief and pressure holding functions according to claim 2, characterized in that, The pressure relief valve includes a valve chamber, a diaphragm, a valve seat, a spring, and a valve ball; The valve chamber is divided into an air chamber and an oil chamber by the diaphragm. The air chamber is connected to the intake manifold. The oil chamber is provided with an oil inlet and an oil outlet. The valve seat is provided with the oil outlet. The valve ball is provided on the valve seat corresponding to the oil outlet. The air chamber is provided with a spring. The spring pushes the valve seat to make the valve ball block the oil outlet. The pressure relief gap is provided between the valve ball and the oil outlet.

4. A fuel pump assembly integrating pressure relief and pressure holding functions according to claim 2, characterized in that, The surface roughness on both sides of the pressure relief gap is 70-73 μm.

5. A fuel pump assembly integrating pressure relief and pressure holding functions according to claim 2, characterized in that, The surface roughness on both sides of the pressure relief gap is 72 μm.

Images