Pump core high-pressure non-return structure of fuel pump

Abstract

The utility model provides a fuel pump core high-pressure non-return structure, which is used for preventing oil injection and comprises a pump core oil outlet seat, a high-pressure non-return valve core, a high-pressure non-return spring and a plug, the high-pressure non-return valve core, the high-pressure non-return spring and the plug are sequentially placed in the pump core oil outlet seat, and the high-pressure non-return valve core, the high-pressure non-return spring and the plug are arranged in the pump core oil outlet seat. The inner edge of an oil outlet of the pump core oil outlet seat comprises a first step and a second step, the end, facing the pump core, of the high-pressure check valve core is stressed to abut against the first step, the other end of the high-pressure check valve core is provided with an annular step, the end, facing the high-pressure check spring, of the plug is connected with the second step in an abutting mode, and the end, facing the high-pressure check spring, of the plug is connected with the second step in an abutting mode. A spring groove is formed in the end surface; the two ends of the high-pressure check spring abut against and are connected with the annular step of the high-pressure check valve element and the spring groove of the plug respectively. The appearance of the pump core is not changed, and the pump core of an original fuel pump assembly can be directly replaced.

Description

Technical Field

[0001] This utility model relates to a fuel pump structure, specifically, to a high-pressure check structure for the pump core of a fuel pump used in a vehicle fuel supply system. Background Technology

[0002] The electric fuel pump assembly is mounted on the fuel tank and functions as a pipeline connection in the fuel supply system. Gasoline in the tank is drawn into the fuel line by the suction generated by the built-in fuel pump, passing through a filter and the outlet pipe to supply the engine. The fuel supply system includes a fuel outlet for drawing fuel from the tank and supplying it to the engine. A portion of this fuel is supplied to the engine via the main pipeline, while the remaining portion is diverted back to the tank via a pressure valve.

[0003] When a vehicle collision causes a fuel line to rupture, the negative pressure inside the fuel tank can cause fuel to spray everywhere, potentially leading to a fire. The pressure generated by the check valve can counteract the pressure inside the fuel tank, effectively preventing fuel injection. In existing technology, the pressure of the check valve in the fuel pump core is insufficient to directly counteract the pressure inside the fuel tank. If the check valve spring is increased directly, the fuel pump will emit a whistling noise during operation. Alternatively, directly connecting an external high-pressure check valve is not only costly, but also reduces the fuel supply performance of the fuel pump assembly.

[0004] Therefore, there is room for improvement in the existing fuel pump core check valve structure. Utility Model Content

[0005] The purpose of this invention is to provide a high-pressure check structure for the pump core of a fuel pump used in a vehicle fuel supply system, in order to solve the problems of the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-pressure check structure for a fuel pump core is provided to prevent fuel injection. The high-pressure check structure includes a pump core outlet seat, a high-pressure check valve core, a high-pressure check spring, and a plug. The high-pressure check valve core, high-pressure check spring, and plug are sequentially placed in the pump core outlet seat. The inner edge of the outlet of the pump core outlet seat includes a first step and a second step. One end of the high-pressure check valve core facing the pump core is subjected to force against the first step, and the other end of the high-pressure check valve core has an annular step. The end of the plug facing the high-pressure check spring abuts against and connects to the second step, and has a spring groove on its end face. The two ends of the high-pressure check spring abut against and connect to the annular step of the high-pressure check valve core and the spring groove of the plug, respectively.

[0008] Preferably, in the high-pressure check structure of the fuel pump core, the plug further includes a radially protruding annular contact surface, the annular contact surface abutting against the outer end face of the oil outlet connected to the fuel outlet seat of the pump core, and the plug is interference-fitted to the fuel outlet seat of the pump core.

[0009] Preferably, in the high-pressure check structure of the fuel pump core, the inner edge of the fuel outlet of the fuel pump core has multiple evenly arranged toothed grooves to increase the flow area and flow rate of the fuel.

[0010] The purpose of this application is to design a pump core with an integrated high-pressure check valve structure, aiming to reduce the impact of existing series check valves on the fuel pump's fuel delivery performance. The specific objectives are as follows:

[0011] (i) The high-pressure check structure replaces the original check structure to meet the opening force requirements, and due to the optimization of the flow channel, the noise during operation is also greatly reduced.

[0012] (ii) By directly integrating the high-pressure check valve core into the pump core outlet, the loss of fuel line pressure and flow is reduced, the number of parts required for the assembly is reduced, and the risk of failure is lowered.

[0013] (iii) Direct integration of the high-pressure check valve into the pump core reduces manufacturing costs and improves enterprise efficiency.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This application combines the oil outlet check valve and the high-pressure check valve into one, resulting in a compact structure, reduced failure risk, and cost savings;

[0016] 2. The pump core of this application has no change in appearance and can directly replace the pump core of the original fuel pump assembly;

[0017] 3. This application has lower oil circuit pressure and flow loss, and significantly reduced noise.

[0018] Of course, implementing any specific embodiment of this utility model may not necessarily achieve all of the above technical effects at the same time. Attached Figure Description

[0019] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the appearance of the fuel pump core in this application;

[0021] Figure 2 This is a sectional view of the pump core oil outlet seat of this application;

[0022] Figure 3This is an enlarged schematic diagram of the cross-section of the oil outlet channel in this application. Detailed Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0024] Please refer to Figure 1 This application presents a schematic diagram of the fuel pump core's appearance. The high-pressure check valve structure applied to the fuel pump core is located within the fuel outlet of the automotive fuel pump core. Directly integrating the high-pressure check valve core into the pump core reduces manufacturing costs and improves enterprise efficiency. In the event of a collision and a break in the fuel line, the structure generates pressure to prevent fuel injection caused by negative pressure in the fuel tank, which could further ignite the vehicle. Similarly, when fuel lines need to be disassembled for automotive repairs, the high-pressure check valve structure effectively prevents fuel injection and avoids adverse consequences. The pump core's appearance remains unchanged, allowing direct replacement of the original fuel pump assembly's core.

[0025] Please refer to Figure 2 This application presents a cross-sectional view of the pump core outlet seat. A high-pressure check structure for a fuel pump core is provided to prevent fuel injection. The high-pressure check structure includes a pump core outlet seat 10, a high-pressure check valve core 20, a high-pressure check spring 30, and a plug 40. The high-pressure check valve core 20, the high-pressure check spring 30, and the plug 40 are sequentially placed into the pump core outlet seat 10. Figure 2 As shown, specifically, it is placed in the oil outlet of the pump core oil outlet seat 10. This design of directly integrating the high-pressure check valve core 20 into the pump core oil outlet reduces the loss of fuel line pressure and flow, reduces the number of parts required for the assembly, and lowers the risk of failure. The inner edge of the oil outlet of the pump core oil outlet seat 10 includes a first step 11 and a second step 12. When the end of the high-pressure check valve core 20 facing the pump core is subjected to force, it abuts against the first step 11 to cover the oil outlet pipe. The other end of the high-pressure check valve core 20 has an annular step 21 to support the high-pressure check spring 30. The end of the plug 40 facing the high-pressure check spring 30 abuts against the second step 12, and a spring groove 41 is formed on the end face to accommodate the high-pressure check spring 30. That is, the two ends of the high-pressure check spring 30 abut against the annular step of the high-pressure check valve core 20 and the spring groove 41 of the plug 40, respectively.

[0026] like Figure 2As shown, the plug 40 also includes a radially protruding annular contact surface 42, which abuts against the outer end face of the oil outlet of the pump core oil outlet seat 10. The plug 40 and the pump core oil outlet seat 10 are interference-fitted to securely fix the high-pressure check valve core 20 and the high-pressure check spring 30 in the pump core oil outlet seat 10. After assembly, the high-pressure check spring 30 is compressed, pressing the high-pressure check valve core 20 against the first step 11. At this time, the fuel needs a certain pressure to overcome the spring force in order to send the fuel from the pump core oil outlet seat 10 to the fuel supply system, which means that the opening force is required. Therefore, this application can adjust the opening pressure of the high-pressure check valve core 20 by changing the spring force of the high-pressure check spring 30, thereby meeting different fuel tank pressure requirements.

[0027] Please refer to Figure 3 The enlarged cross-sectional view of the oil outlet channel in this application, which is the inner edge surface of the oil outlet of the pump core oil outlet seat 10 and the cross-section of the high-pressure check valve core 20, shows that the inner edge surface of the oil outlet of the pump core oil outlet seat 10 in this application has multiple evenly arranged toothed grooves 13. Compared with the prior art, the toothed grooves 13 increase the flow area and flow rate of fuel, resulting in higher efficiency; and due to the optimization of the flow channel, the oil pressure and flow loss are smaller, and the noise during operation is also greatly reduced.

[0028] The working principle of the high-pressure check valve structure of the fuel pump core in this application is as follows:

[0029] 1. The high-pressure check structure of the fuel pump core is arranged inside the oil outlet of the pump core, replacing the original check valve structure; the high-pressure check spring 30 of the compression structure provides a certain pressure to the high-pressure check valve core 20, so that the high-pressure check structure needs a certain pressure to open and have the original check function of the pump core.

[0030] 2. When a vehicle collision causes a fuel line to break, the negative pressure inside the fuel tank can cause fuel to spray everywhere, potentially leading to a fire. The pressure generated by the high-pressure check structure can counteract the pressure inside the fuel tank, effectively preventing fuel spraying.

[0031] 3. When the fuel line is disconnected for vehicle maintenance, the high-pressure check structure can also effectively prevent fuel injection and prevent adverse consequences.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. This application combines the oil outlet check valve and the high-pressure check valve into one, resulting in a compact structure, reduced failure risk, and cost savings;

[0034] 2. The pump core of this application has no change in appearance and can directly replace the pump core of the original fuel pump assembly;

[0035] 3. This application has lower oil circuit pressure and flow loss, and significantly reduced noise.

[0036] Of course, any specific embodiment of the present invention may not necessarily have all of the above technical effects at the same time.

[0037] The above-disclosed embodiments are merely preferred embodiments of the present utility model, but are not intended to limit the scope thereof. Any equivalent changes and modifications made by those skilled in the art without departing from the spirit and essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A high-pressure check structure for a fuel pump core, used to prevent fuel injection, characterized in that, The high-pressure check structure includes a pump core oil outlet seat, a high-pressure check valve core, a high-pressure check spring, and a plug. The high-pressure check valve core, high-pressure check spring, and plug are sequentially placed in the pump core oil outlet seat. The inner edge of the oil outlet of the pump core oil outlet seat includes a first step and a second step. One end of the high-pressure check valve core facing the pump core is subjected to force against the first step, and the other end of the high-pressure check valve core has an annular step. The end of the plug facing the high-pressure check spring abuts against and connects to the second step, and has a spring groove on its end face. The two ends of the high-pressure check spring abut against and connect to the annular step of the high-pressure check valve core and the spring groove of the plug, respectively.

2. The high-pressure check structure for the fuel pump core according to claim 1, characterized in that, The plug also includes a radially protruding annular contact surface, which abuts against the outer end face of the oil outlet of the pump core oil outlet seat, and the plug is interference-fitted to the pump core oil outlet seat.

3. The high-pressure check structure for the fuel pump core according to claim 2, characterized in that, The inner edge of the oil outlet of the pump core oil outlet seat has multiple evenly arranged toothed grooves to increase the flow area and flow rate of the fuel.

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