Coarse filtering structure of fuel pump

Abstract

The utility model provides a fuel pump rough filtration structure, which is used for filtering fuel, the rough filtration structure comprises a filter screen interface, a filter screen cloth and a filter screen framework, the filter screen cloth is arranged on the filter screen framework, an opening of the filter screen cloth is arranged between the filter screen interface and the filter screen framework in an interference fit mode, and the filter screen interface is arranged on the filter screen framework. The outer edge face of the end, facing the filter screen framework, of the filter screen connector comprises a step connecting ring, an annular groove is formed in the position, corresponding to the step connecting ring, of the filter screen framework, and the step connecting ring is inserted and connected into the annular groove to clamp the filter screen cloth in an interference fit mode. The failure that the filter screen framework is crushed, the filter screen connector is blocked and the like due to deviation of the filter screen cloth is effectively prevented.

Description

Technical Field

[0001] This utility model relates to a fuel pump structure, specifically, to a sealing structure between the filter screen of the fuel coarse filter and the oil suction filter interface 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 intake port for drawing fuel in through the fuel pump and supplying it to the engine. To remove impurities mixed with the fuel, a filter is sometimes installed at the fuel intake port. The fuel flows from the outside to the inside of a bag-like filter cloth to remove impurities. A pipeline component installed on the filter cloth then removes fuel from the inside of the filter cloth. A portion of this fuel is supplied to the engine via the main pipeline, while the remaining portion is diverted back to the fuel tank via a pressure valve.

[0003] Existing technologies, such as Figure 1 As shown, in order to prevent the filter mesh from shifting and to ensure the sealing performance at the interface, the filter mesh and the connector can only be combined into one part through integrated injection molding or welding. This greatly increases the manufacturing cost and also increases the risk of filter mesh failure.

[0004] Therefore, there is room for improvement in the existing fuel pump coarse filter screen and the sealing structure of the oil suction filter interface. Utility Model Content

[0005] The purpose of this invention is to provide a sealing structure for the interface between the coarse filter screen of the fuel pump and the oil suction filter screen 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 fuel pump coarse filter structure is provided for filtering fuel. The coarse filter structure includes a filter screen interface, a filter screen cloth, and a filter screen frame. The filter screen cloth is disposed on the filter screen frame, and the opening of the filter screen cloth is interference-fitted between the filter screen interface and the filter screen frame. The outer edge surface of the filter screen interface facing the filter screen frame includes a stepped connecting ring, and the filter screen frame includes an annular groove corresponding to the stepped connecting ring. The stepped connecting ring is inserted into the annular groove and interference-fitted to clamp the filter screen cloth.

[0008] Preferably, in the fuel pump coarse filter structure, the filter mesh sandwiched between the stepped connecting ring and the annular groove includes a clamping base and a clamping extension. The stepped connecting ring presses against the clamping base, and the two sides of the clamping extension are tightly connected to the stepped connecting ring and the annular groove.

[0009] Preferably, in the fuel pump coarse filter structure, a slot is formed on the inner edge of the filter screen interface, and a protrusion is formed on the annular groove corresponding to the position of the slot, the protrusion engaging with the slot.

[0010] The purpose of this application is to effectively fix the position of the filter mesh, prevent the mesh from shifting during assembly or use and thus causing failure, and reduce manufacturing risks and costs. The specific objectives are as follows:

[0011] (i) The filter mesh is clamped between the filter frame and the filter interface, so that the filter mesh is firmly clamped; this ensures the seal at the opening of the filter mesh and prevents the filter mesh from shifting, which could lead to damage to the filter frame or blockage of the filter interface.

[0012] (ii) The use of mechanical structure to fix the filter mesh reduces the mold cost required for one-piece injection molding and the tooling cost required for welding, and also reduces the risk of filter mesh damage.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This application effectively prevents filter screen frame damage and filter screen interface blockage caused by filter screen mesh misalignment;

[0015] 2. This application has a wide range of applications and can be matched with fuel pump assemblies that meet the needs of fuel tanks of different shapes;

[0016] 3. This application adopts a mechanical structure, which eliminates the need for additional molds or tooling, thus saving costs.

[0017] 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

[0018] 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:

[0019] Figure 1 This is a schematic diagram of the appearance of a pre-filter assembly in the prior art;

[0020] Figure 2 This is a cross-sectional view of the filter mesh, filter frame, and filter interface of this application;

[0021] Figure 3 for Figure 2 Enlarged schematic diagram. Detailed Implementation

[0022] 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.

[0023] Please refer to Figure 2 and Figure 3 This application presents a cross-sectional view of the filter mesh, filter frame, and filter interface. The application relates to a fuel supply system for vehicles, where a fuel pump assembly is fixed to the fuel tank. Fuel is first pumped by the fuel pump core, then filtered through a coarse filter structure to remove impurities. A portion of the fuel is supplied to the engine via the main pipeline, while the remaining portion is returned to the fuel tank via a pressure valve. The sealing structure between the fuel pump coarse filter mesh and the fuel suction filter interface, designed in this application, effectively fixes the position of the filter mesh, preventing displacement during assembly or use that could lead to failure, and reducing manufacturing risks and costs.

[0024] like Figure 2 As shown, the fuel pump coarse filter structure of this application is used to filter fuel. The coarse filter structure includes a filter screen interface 10, a filter screen cloth 20, and a filter screen frame 30. The filter screen cloth 20 is disposed on the filter screen frame 30. The function of the filter screen frame 30 is to open the filter screen cloth 20 to form a fuel flow space. The opening of the filter screen cloth 20 is interference-fitted between the filter screen interface 10 and the filter screen frame 30, which makes the filter screen cloth 20 more securely fixed and also seals the interface to prevent leakage.

[0025] like Figure 3 As shown, the outer edge of the filter screen interface 10 facing the filter screen frame 30 includes a stepped connecting ring 11. The diameter of the stepped connecting ring 11 is smaller than the diameter of the annular body of the filter screen interface 10 to which it is connected. The filter screen frame 30 includes an annular groove 31 corresponding to the stepped connecting ring 11. During assembly, the stepped connecting ring 11 is inserted into the annular groove 31 to clamp the filter screen fabric 20 with an interference fit. This application uses a mechanical structure to fix the filter screen fabric 20, reducing the mold cost required for one-piece injection molding and the tooling cost required for welding, while also reducing the risk of damage to the filter screen fabric 20.

[0026] in addition, Figure 3In this embodiment, the filter mesh 20 clamped by the stepped connecting ring 11 and the annular groove 31 includes a clamping base 21 and a clamping extension 22, that is, the opening of the filter mesh 20 includes the clamping base 21 and the clamping extension 22. In this embodiment, the clamping base 21 is perpendicular to the clamping extension 22. After assembly, the stepped connecting ring 11 presses and connects to the clamping base 21, while the two sides of the clamping extension 22 are tightly connected to the stepped connecting ring 11 and the annular groove 31. The design of the clamping base 21 and the clamping extension 22 makes the filter mesh 20 more securely fixed. This application clamps the filter mesh 20 between the filter frame 30 and the filter interface 10, so that the filter mesh 20 is firmly clamped; this ensures the sealing of the opening of the filter mesh 20 and prevents the filter mesh 20 from shifting, which could lead to damage to the filter frame 30 or blockage of the filter interface 10.

[0027] In addition, a slot 12 is formed on the inner edge surface of the filter interface 10, and a protrusion 32 is formed on the annular groove 31 corresponding to the position of the slot 12. After assembly, the protrusion 32 engages with the slot 12. The engagement increases the pull-out force of the filter interface 10 and the filter frame 30, further improving the fixation of the filter mesh 20. At the same time, it improves the sealing ability of the filter interface 10 and prevents the filter mesh 20 from leaking.

[0028] As described above, after assembly, the filter screen 20 is subject to two limiting forces. First, the stepped connecting ring 11, inserted into the annular groove 31, clamps the clamping base 21 with an interference fit, restricting the horizontal movement of the filter screen 20. Second, the stepped connecting ring 11, combined with the annular groove 31, clamps the clamping extension 22, limiting the vertical movement of the filter screen 20. These two limiting forces ensure the filter screen 20 is stably fixed within the annular groove 31. The fuel pump coarse filter structure of this application is used for filtering fuel, has a wide range of applications, and can be matched with fuel pump assemblies for fuel tanks of different shapes.

[0029] The working principle of the fuel pump in this application is as follows:

[0030] 1. When the fuel pump starts working, the fuel is filtered through the filter screen 20. A portion of the flow from the fuel pump core outlet provides the engine fuel system with instantaneous pressure and flow of fuel, while the other portion is returned to the fuel tank via the pressure valve.

[0031] 2. The fuel passes through the filter screen 20 to filter impurities in the fuel, preventing impurities from entering the fuel pump core and jamming the blades, thus preventing it from working properly;

[0032] 3. The constant pressure from the pressure valve allows the fuel supply system to deliver a stable pressure into the engine fuel system.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. This application effectively prevents filter screen frame damage and filter screen interface blockage caused by mesh fabric misalignment;

[0035] 2. This application has a wide range of applications and can be matched with fuel pump assemblies that meet the needs of fuel tanks of different shapes;

[0036] 3. This application adopts a mechanical structure, which eliminates the need for additional molds or tooling, thus saving costs.

[0037] Of course, any specific embodiment of the present invention may not necessarily have all of the above technical effects at the same time.

[0038] 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 fuel pump coarse filter structure for filtering fuel, characterized in that, The coarse filtration structure includes a filter screen inlet, a filter screen cloth, and a filter screen frame. The filter screen cloth is disposed on the filter screen frame, and the opening of the filter screen cloth is interference-fitted between the filter screen inlet and the filter screen frame. The outer edge of the filter screen interface facing the filter screen frame includes a stepped connecting ring, and the filter screen frame includes an annular groove corresponding to the stepped connecting ring. The stepped connecting ring is inserted into the annular groove and clamps the filter screen mesh with an interference fit.

2. The fuel pump coarse filter structure according to claim 1, characterized in that, The filter mesh sandwiched between the stepped connecting ring and the annular groove includes a clamping base and a clamping extension. The stepped connecting ring presses against the clamping base, and the two sides of the clamping extension are tightly connected to the stepped connecting ring and the annular groove.

3. The fuel pump coarse filter structure according to claim 2, characterized in that, A slot is formed on the inner edge of the filter interface, and a protrusion is formed on the annular groove corresponding to the position of the slot, and the protrusion engages with the slot.

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