Alcohol-resistant fuel pump element

Abstract

This utility model provides an alcohol-resistant fuel pump core, comprising a housing, a fuel outlet seat, a carbon brush assembly, and an anti-interference circuit assembly. The anti-interference circuit assembly is disposed on the fuel outlet seat. The anti-interference circuit assembly includes two power lines, two terminals, two inductors, two contacts, a capacitor, a first plastic sheath, and a second plastic sheath. The first plastic sheath is injection-molded to connect the two terminals and the two contacts to form a plastic-coated connecting block. The two power lines are fixedly connected to the two terminals. The two inductors are disposed on the plastic-coated connecting block and electrically connected to the two terminals. The capacitor is disposed on the plastic-coated connecting block and electrically connected to the two terminals. The second plastic sheath is injection-molded to the plastic-coated connecting block. The two contacts are interference-fitted to the carbon brush assembly. This application seals and isolates the exposed metal parts from the fuel, preventing corrosion and extending the service life of the fuel pump.

Description

Technical Field

[0001] This utility model relates to a fuel pump structure, specifically, to a fuel pump core that is alcohol-resistant and used in a vehicle's fuel supply system. Background Technology

[0002] The fuel pump is used in the automotive fuel supply system and is an important component of the modern automotive fuel control system. When the fuel pump is powered on, it pumps fuel out of the fuel tank, and supplies the fuel at a certain pressure and flow rate to the engine through the pipeline to meet the engine's fuel supply needs.

[0003] Most existing fuel pumps cannot operate for extended periods in alcohol-based media, as they are easily corroded by alcohol fuels, affecting metal components such as brush leads and positive and negative contacts, leading to pump core failure. If adhesive is used to seal the terminals, after the adhesive dries and shrinks, there will still be a risky gap between the adhesive and the housing, allowing gasoline to enter and corrode the metal components, ultimately causing failure.

[0004] Therefore, there is still room for improvement in the pump core of existing fuel pumps. Utility Model Content

[0005] The purpose of this invention is to provide an alcohol-resistant fuel pump core structure for use in a vehicle fuel supply system, which can operate for extended periods in alcohol-based fuels, thereby solving the problems of the prior art.

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

[0007] A fuel pump core resistant to alcohol is provided for pumping fuel. The pump core includes a housing, a fuel outlet seat, a carbon brush assembly, and an anti-interference circuit assembly. The carbon brush assembly is disposed in the fuel outlet seat, the fuel outlet seat is disposed in the housing, and the anti-interference circuit assembly is disposed on the fuel outlet seat. The anti-interference circuit assembly includes two power lines, two terminals, two inductors, two contacts, a capacitor, a first plastic sheath, and a second plastic sheath. The first plastic sheath is injection-molded to connect the two terminals and the two contacts to form a plastic-coated connecting block. The two power lines are fixedly connected to the two terminals. The two inductors are disposed on the plastic-coated connecting block and electrically connected to the two terminals. The capacitor is disposed on the plastic-coated connecting block and electrically connected to the two terminals. The second plastic sheath is injection-molded to the plastic-coated connecting block. The two contacts are interference-fitted to the carbon brush assembly.

[0008] Preferably, the second plastic package includes two corresponding slots that engage with the oil outlet seat.

[0009] Preferably, the terminals at the ends of the two power lines are fixedly connected to the two connecting pieces by fasteners.

[0010] The purpose of this application is to provide a fuel pump that can operate for a long time in alcohol fuels. Compared with the fuel pumps of the prior art, the advantage of this fuel pump structure is that it can completely prevent the corrosion of metal parts of the fuel pump by alcohol fuels, such as the connecting parts of the terminals, power cords, carbon brush assembly lead connectors, inductors and other metal parts, which would lead to pump core failure.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. This application uses a sealed plastic coating to encapsulate the connection points of the connectors, power cords, carbon brush assembly leads, inductors, etc., to seal and isolate the exposed metal parts from oil and prevent corrosion.

[0013] 2. The carbon brush assembly and the contact plate of this application are interference-fitted, and the plastic coating function isolates the ionization between the positive and negative terminals, effectively inhibiting the corrosion of metal parts by alcohol media and extending the service life of the fuel pump.

[0014] 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

[0015] 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:

[0016] Figure 1 This is a cutaway explosion diagram of the pump core portion of this application;

[0017] Figure 2 This is a cross-sectional view of the first package of plastic in this application;

[0018] Figure 3 This is a cross-sectional schematic diagram of the carbon brush assembly and anti-interference circuit assembly of this application;

[0019] Figure 4 This is a schematic diagram of the appearance of the anti-interference circuit assembly of this application. Detailed Implementation

[0020] 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.

[0021] Please refer to Figure 1This application presents a partially exploded cutaway diagram of the pump core. The pump core of this application is a pump core that can operate for a long time in alcohol-based fuels. Compared with pump cores with existing technology structures, it can completely prevent the corrosion of metal parts of the fuel pump by alcohol-based fuels, such as connectors, power cords, lead sockets of carbon brush assemblies, inductors, and other metal parts, thereby increasing the service life of the pump core.

[0022] like Figure 1 As shown, this application discloses an alcohol-resistant fuel pump core for pumping fuel. To prevent the exposed metal material in the pump core from being corroded by alcohol fuel, the exposed metal material in the prior art is sealed with plastic. The pump core includes a housing 4, an oil outlet seat 3, a carbon brush assembly 2, and an anti-interference circuit assembly 1. The carbon brush assembly 2 is disposed in the oil outlet seat 3, the oil outlet seat 3 is disposed in the housing 4, and the anti-interference circuit assembly 1 is disposed on the oil outlet seat 3.

[0023] Please refer to Figure 2 , Figure 3 and Figure 4 The anti-interference circuit assembly 1 includes two power lines 5, two connecting pieces 6, two inductors 7, two connecting pieces 8, a capacitor 9, a first plastic wrap 10, and a second plastic wrap 11. To ensure the airtightness of the plastic wrap and the convenience of assembly, this application performs two plastic wrapping processes. In the first plastic wrapping process, the first plastic wrap 10 is injection-molded to connect the two connecting pieces 6 and the two connecting pieces 8 to form a plastic wrapping connecting block. The two connecting pieces 6 and the two connecting pieces 8 are externally connectable plastic wrappings within the plastic wrapping connecting block. Then, before the second plastic wrapping process, the relevant components are set on the plastic wrapping connecting block. The two power lines 5 are fixedly connected to the two connecting pieces 6. The two inductors 7 are set on the plastic wrapping connecting block and electrically connected to the two connecting pieces 6. During molding, an inductor placement groove is set on the plastic wrapping connecting block, and the inductors 7 are placed in the inductor placement groove for easy soldering.

[0024] Figure 2 In this circuit, the capacitor 9 is disposed on the plastic-coated connecting block and electrically connected to the two terminals 6. The capacitor 9, disposed between the two terminals 6, mainly functions to filter and store energy in conjunction with the inductor 7. After the two power lines 5, the two inductors 7, and the capacitor 9 are all disposed on the plastic-coated connecting block, a second plastic coating process is performed. The second plastic coating 11 is injection-molded and connected to the plastic-coated connecting block to form the anti-interference circuit assembly 1. After the second plastic coating process, the two terminals 8 are externally connectable and are coated in the second plastic coating 11, and the metal wires of the two power lines 5 are covered in the second plastic coating 11. When assembling the anti-interference circuit assembly 1 and the fuel outlet 3, the two terminals 8 are interference-fitted to the carbon brush assembly 2 so that the pump body and the anti-interference circuit assembly 1 can form a normal circuit, enabling the fuel pump to work normally.

[0025] like Figure 1 and Figure 4 As shown, the second plastic package 11 includes two corresponding slots 12. The slots 12 are axially protruding pieces with slots on the edge of the second plastic package 11. The oil outlet seat 3 has a protrusion (not shown) at the position corresponding to the slot of the slot 12. The slots 12 engage with the protrusion of the oil outlet seat 3 to securely connect the anti-interference circuit assembly 1 to the oil outlet seat 3. The lead connector of the carbon brush assembly 2 is inserted into the through hole of the connector 8 with an interference fit. After assembly, the oil outlet seat 3, carbon brush assembly 2 and anti-interference circuit assembly 1 are further sealed so that the oil can only flow out through the oil outlet of the oil outlet seat 3, thus isolating the components in oil.

[0026] like Figure 3 As shown, the terminals at the ends of the two power lines 5 are fixedly connected to the two connecting pieces 6 by fasteners. However, this cannot be used to limit this application. For example, using a connection method where the connecting pieces are covered and flattened, as long as a stable connection can be achieved, should be within the scope of protection of this application. The number of power lines 5, connecting pieces 6, inductors 7, and connecting pieces 8 in this application is two mainly because one connects to the positive terminal of the power supply and the other connects to the negative terminal. The DC current passes through the positive terminal connecting piece, the positive inductor, and the brush to reach the rotor. The current on the rotor commutator passes through the windings on the rotor, exits from the negative inductor and brush, and flows out through the negative terminal connecting piece, forming a complete circuit.

[0027] The design highlights of this application are as follows: When the fuel pump assembly is used in M100 methanol gasoline, E100 ethanol gasoline, or gasoline of poor quality, the metal parts of the pump core in the prior art are exposed to the outside after welding and directly contact the fuel, which will cause the welded joints and terminals to be corroded by the gasoline. The secondary plastic coating method of this application ensures the sealing of the plastic coating and the convenience of assembly, prevents the metal parts from being corroded, and thus increases the service life of the pump core and the fuel pump in alcohol media.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1.1. This application uses a sealed plastic coating to encapsulate the connection points of the connectors, power cords, carbon brush assembly leads, inductors, etc., to seal and isolate the exposed metal parts from oil and prevent corrosion.

[0030] 2. The carbon brush assembly and the contact plate of this application are interference-fitted, and the plastic coating function isolates the ionization between the positive and negative terminals, effectively inhibiting the corrosion of metal parts by alcohol media and extending the service life of the fuel pump.

[0031] Of course, any specific embodiment of the present invention may not necessarily have all of the above technical effects at the same time.

[0032] 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. An alcohol-resistant fuel pump core for pumping fuel, characterized in that, The pump core includes a housing, an oil outlet seat, a carbon brush assembly, and an anti-interference circuit assembly. The carbon brush assembly is disposed in the oil outlet seat, the oil outlet seat is disposed in the housing, and the anti-interference circuit assembly is disposed on the oil outlet seat. The anti-interference circuit assembly includes two power lines, two terminals, two inductors, two contacts, a capacitor, a first plastic sheath, and a second plastic sheath. The first plastic sheath is injection-molded to connect the two terminals and the two contacts to form a plastic-coated connecting block. The two power lines are fixedly connected to the two terminals. The two inductors are disposed on the plastic-coated connecting block and electrically connected to the two terminals. The capacitor is disposed on the plastic-coated connecting block and electrically connected to the two terminals. The second plastic sheath is injection-molded to connect the plastic-coated connecting block. The two contacts are interference-fitted to the carbon brush assembly.

2. The alcohol-resistant fuel pump core according to claim 1, characterized in that, The second plastic package includes two corresponding slots that engage with the oil outlet seat.

3. The alcohol-resistant fuel pump core according to claim 2, characterized in that, The terminals at the ends of the two power lines are fixedly connected to the two connecting pieces by fasteners.

Images