A conductive fuel one-way valve assembly for dual fuel tanks

Abstract

The present invention discloses a conductive fuel check valve assembly for dual fuel tanks, comprising an upper valve body, a lower valve body, a valve core assembly, and a conductive sleeve. The upper valve body and the lower valve body are overlapped and connected, and the valve core assembly is disposed within the inner cavity of the lower valve body. The valve core assembly is used to seal the inner cavity of the upper valve body, thereby forming a one-way flow passage between the upper and lower valve bodies. The outer wall surface of the lower valve body adjacent to the upper valve body is flush with the outer wall surface of the upper valve body, and a conductive sleeve is sleeved at the overlap between the upper and lower valve bodies. The conductive sleeve is interference-fitted with the outer walls of the upper and lower valve bodies, and the joints between the conductive sleeve and the upper and lower valve bodies are sealed by welding. The present invention achieves one-way flow and has a compact structure. The valve body forms an integral conductor, improving electrical conductivity.

Description

Technical Field

[0001] The invention relates to the technical field of one-way valves for automobile fuel systems, and in particular to a conductive fuel one-way valve assembly for dual fuel tanks. Background Art

[0002] With the increasing demand for long-distance driving in the domestic automobile market, the demand for fuel tank capacity of the vehicle is constantly increasing; however, due to the limitation of the vehicle wheelbase space, using a single fuel tank to meet the vehicle's demand for fuel tank capacity faces many difficulties; therefore, the use of dual fuel tanks has become one of the effective solutions to meet the vehicle's demand for fuel tank capacity.

[0003] Dual fuel tanks are generally available in two types based on their structure. One uses a tee to connect the inlet and return lines of the two tanks, then connects them to the engine, allowing both tanks to be used simultaneously or switched between them. The second type connects the two tanks in series, with piping connecting the bottoms of the two tanks. The engine fuel line is connected only to one of the main tanks, and the two tanks use diesel simultaneously via the bottom connecting pipe. This second structure is essentially an expansion of the original tank. However, in actual use, the first structure uses parallel branches, allowing fuel from one tank's supply line to flow into the other. Check valves are required in the supply lines of both tanks to prevent fuel backflow and mixing. In gasoline tanks, electrical conductivity is a key consideration, requiring good conductivity for the check valve. Conventional check valves in existing technology need to improve their conductivity, opening speed, and sealing performance. Summary of the Invention

[0004] The purpose of the present invention is to solve the technical problem in the above-mentioned prior art that the conductivity, opening speed and sealing performance of the one-way valve used in the dual fuel tank system of an automobile need to be improved, and to provide a conductive fuel one-way valve assembly for a dual fuel tank, which improves the conductivity, opening speed and sealing performance of the one-way valve after closing and improves the smooth operation of the one-way valve.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] When the valve is opened, the valve core is provided in the inner cavity of the lower valve body, and the valve core is provided in the cavity of the upper valve body so that a one-way flow passage is formed between the upper valve body and the lower valve body, and the flow direction of the one-way flow is from the upper valve body to the lower valve body; a first step is provided on the outer wall of the lower valve body, and the outer wall surface of the lower valve body close to the upper valve body is flush with the outer wall surface of the upper valve body, and a conductive sleeve is provided at the overlap of the upper valve body and the lower valve body, the conductive sleeve is interference fit with the outer walls of the upper valve body and the lower valve body, and the joints between the conductive sleeve and the upper valve body and the lower valve body are sealed by welding.

[0007] Furthermore, an outwardly protruding blocking boss is provided on the outer wall of the lower valve body, and the conductive sleeve abuts against one side of the blocking boss.

[0008] Furthermore, the upper valve body, the lower valve body and the conductive sleeve are made of conductive nylon material.

[0009] Furthermore, the valve core assembly includes a rubber valve core, a plastic valve core, and a spring. The rubber valve core is clamped inside the plastic valve core, and the outer wall of the plastic valve core slides with the inner cavity of the lower valve body so that the plastic valve core slides along the inner wall of the lower valve body; the spring is located in the lower valve body, one end of the spring abuts against the end of the lower valve body inner cavity away from the upper valve body, and the other end of the spring abuts against the plastic valve core to push the plastic valve core toward the upper valve body.

[0010] Furthermore, the rubber valve core includes a shuttle cone-shaped valve cone head, the inner cavity of the upper valve body is provided with a sealing slope, and the outer wall conical surface of the valve cone head fits on the sealing slope on the inner cavity of the upper valve body to form a sealing fit.

[0011] Furthermore, a first groove is provided on the outer wall of the rubber valve core, and the plastic valve core includes a clamping ring, a support column, and a tail ring which are integrally formed in sequence. The clamping ring is clamped in the first groove, and the support column is fixedly connected to the circumference of the clamping ring, and the outer wall size of the support column is larger than the outer wall size of the rubber valve core. The outer wall of the support column is fitted on the inner wall of the lower valve body, and there is a gap between adjacent support columns, so that a gap is formed between the outer wall of the rubber valve core and the inner wall of the lower valve body for fuel to flow through; the tail ring is fixedly connected to the end of the support column away from the clamping ring.

[0012] Furthermore, a tail post is provided at one end of the rubber valve core away from the valve cone head, and a transition slope is provided between the tail post and the first groove section, and the tail post is located on the central axis of the rubber valve core.

[0013] Furthermore, the oil inlet end of the upper valve body is fixedly connected to an oil inlet pipe joint, and the oil outlet end of the lower valve body is fixedly connected to an oil outlet pipe joint. Both the oil inlet pipe joint and the oil outlet pipe joint adopt a pagoda head structure with an outwardly protruding barb structure on the outer wall.

[0014] Furthermore, a sealing groove is provided on the oil inlet pipe joint and the oil outlet pipe joint, and a sealing ring is provided in the sealing groove.

[0015] Furthermore, the cross-sectional shape of the sealing ring is any one of circular, elliptical, rectangular or trapezoidal.

[0016] The present invention provides a conductive fuel one-way valve assembly for dual fuel tanks, which has the following beneficial effects: it realizes the function of one-way flow and has a compact structure; the valve body forms an integral conductor, which improves the conductivity; the conical surface of the outer wall of the valve cone head cooperates with the sealing inclined surface to ensure the reliability of the seal when the one-way valve is in the closed state, improves the smoothness of the opening and closing action of the one-way valve, and improves the operational stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 A schematic structural diagram of a conductive fuel one-way valve assembly for dual fuel tanks provided by the present invention;

[0019] Figure 2 A schematic cross-sectional view of a conductive fuel one-way valve assembly for dual fuel tanks provided by the present invention;

[0020] Figure 3 A schematic diagram of the three-dimensional structure of a conductive fuel one-way valve assembly for dual fuel tanks provided by the present invention;

[0021] Figure 4 Schematic diagram of the structure of the valve core assembly in the present invention;

[0022] Figure 5 Schematic diagram of the structure of the rubber valve core in the present invention;

[0023] Figure 6 This is a schematic structural diagram of the plastic valve core of the present invention;

[0024] Figure 7 Schematic diagram of the structure of the upper valve body in the present invention;

[0025] Figure 8 It is a structural schematic diagram of the lower valve body in the present invention.

[0026] Explanation of the numbers in the figure: 1. Upper valve body; 11. Sealing slope; 12. Oil inlet pipe joint; 13. Sealing groove; 2. Lower valve body; 21. First step; 22. Blocking boss; 23. Oil outlet pipe joint; 3. Valve core assembly; 31. Rubber valve core; 311. Valve cone head; 312. First groove; 313. Tail column; 32. Plastic valve core; 321. Snap ring; 322. Support column; 323. Tail ring; 33. Spring; 4. Conductive sleeve; 5. Sealing ring. DETAILED DESCRIPTION

[0027] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up-down-left-right-front-back...) are only used to explain the relative position relationship - movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0030] like Figures 1-8 As shown, a conductive fuel one-way valve assembly for dual fuel tanks includes an upper valve body 1, a lower valve body 2, a valve core assembly 3, and a conductive sleeve 4.

[0031] The lower portion of the upper valve body 1 and the upper portion of the lower valve body 2 are both open cavity structures. The upper outer wall of the lower valve body 2 and the upper outer wall of the upper valve body 1 form a closed structure.

[0032] A valve core assembly 3 is provided in the inner cavity of the lower valve body 2 , and the valve core assembly 3 is used to seal the inner cavity of the upper valve body 1 so that a one-way flow passage is formed between the upper valve body 1 and the lower valve body 2 , flowing from the upper valve body 1 to the lower valve body 2 .

[0033] Further references Figure 2 The outer wall of the lower valve body 2 is provided with a first step 21, and the outer shell of the upper valve body 1 falls on the first step 21. The outer wall surface of the lower valve body 2 close to the upper valve body 1 is flush with the outer wall surface of the upper valve body 1, and a circle of conductive sleeve 4 is provided on the outer surface of the junction of the upper valve body 1 and the lower valve body 2.

[0034] An outwardly protruding blocking boss 22 is provided on the outer wall of the lower valve body 2 , and the conductive sleeve 4 abuts against one side of the blocking boss 22 .

[0035] The conductive sleeve 4 is interference fit with the outer walls of the upper valve body 1 and the lower valve body 2 , and the joints between the conductive sleeve 4 and the upper valve body 1 and the lower valve body 2 are sealed by welding.

[0036] The above technical solution is adopted and applied to the fuel supply system of the dual fuel tank of the automobile. The one-way flow of fuel is realized by the one-way valve, and the fuel is only allowed to be discharged from the fuel tank under the action of the fuel pump. At the same time, the fuel backflow and the mixing of fuel in the two fuel tanks are prevented, which meets the design requirements of the dual fuel tank and improves the vehicle's cruising range; the upper valve body 1 and the lower valve body 2 are in contact with each other through overlapping, and the external interference fit is provided with a conductive sleeve 4, which further connects the upper valve body 1 and the lower valve body 2 into an integral conductive conductor through the conductive sleeve 4, thereby ensuring good conductivity.

[0037] In the present invention, the outer wall of the lower valve body 2 is provided with an outwardly protruding blocking boss 22, and the conductive sleeve 4 abuts against one side of the blocking boss 22. The blocking boss 22 limits the conductive sleeve 4 in position, facilitating installation. Specifically, the exterior of the lower valve body 2 is provided with an arrow indicating the flow direction; and the outer wall of the lower valve body 2 is provided with a molded groove. These grooves reduce material consumption and facilitate gripping during installation, preventing slippage during installation.

[0038] In the present invention, the upper valve body 1, the lower valve body 2, and the conductive sleeve 4 are made of conductive nylon material, which has structural strength and convenient structural conductivity, and guides the generated static electricity to the oil pipe and then conducts it.

[0039] In the present invention, Figure 4 As shown, the valve core assembly 3 includes a rubber valve core 31 , a plastic valve core 32 , and a spring 33 .

[0040] The rubber valve core 31 is clamped in the inside of the plastic valve core 32, and the outer wall of the plastic valve core 32 slides with the inner cavity of the lower valve body 2 so that the plastic valve core 32 slides along the inner wall of the lower valve body 2; the spring 33 is located in the lower valve body 2, and one end of the spring 33 abuts against the end of the inner cavity of the lower valve body 2 away from the upper valve body 1, and the other end of the spring 33 abuts on the plastic valve core 32 to push the plastic valve core 32 toward the upper valve body 1.

[0041] The elastic force generated by the compression of the spring 33 causes the plastic valve core 32 to maintain the rubber valve core 31 connected to the plastic valve core 32 in an upward valve core abutment state under the action of the pressure difference. After the pressurized fuel enters the upper valve body 1 under the action of the oil pump, the pressurized fuel overcomes the elastic force of the spring 33, causing the one-way valve to open, thereby forming a valve opening and closing action.

[0042] In the present invention, the rubber valve core 31 includes a spindle-cone-shaped valve cone head 311. The inner cavity of the upper valve body 1 is provided with a sealing bevel 11. The outer conical surface of the valve cone head 311 is in contact with the sealing bevel 11 on the inner cavity of the upper valve body 1, forming a seal. The spindle-cone-shaped valve cone head 311 design facilitates fuel flow around the rubber valve core 31 after the one-way valve is opened. The outer conical surface of the valve cone head 311 cooperates with the sealing bevel 11 to ensure a reliable seal while allowing for free separation. When the conical surface separates from the sealing bevel 11, the flow channel is opened, improving the opening and closing reaction speed.

[0043] In the present invention, a first groove 312 is provided on the outer wall of the rubber valve core 31, and the plastic valve core 32 includes a snap ring 321, a support column 322, and a tail ring 323 which are integrally formed in sequence. The snap ring 321 is snapped into the first groove 312, and the support column 322 is fixedly connected to the circumference of the snap ring 321. The outer wall size of the support column 322 is larger than the outer wall size of the rubber valve core 31. The outer wall of the support column 322 is fitted on the inner wall of the lower valve body 2, and gaps are provided between adjacent support columns 322, so that a gap for fuel to flow is formed between the outer wall of the rubber valve core 31 and the inner wall of the lower valve body 2; the tail ring 323 is fixedly connected to the end of the support column 322 away from the snap ring 321.

[0044] By arranging the support columns 322 at intervals, a flow channel is formed through the intervals between the support columns 322, so that the fuel flowing through the rubber valve core 31 can flow from between the support columns 322 to the tail of the lower valve body 2 and out, thereby facilitating the fuel to flow quickly through the one-way valve.

[0045] In the present invention, a tail post 313 is provided at the end of the rubber valve core 31 away from the valve cone 311. A transition slope is provided between the tail post 313 and the first groove 312. The tail post 313 is located on the central axis of the rubber valve core 31. The tail post 313 prevents sudden pressure drops and bubbles from forming after the fuel flows through the rubber valve core 31, and prevents radial vibration of the valve core, thereby maintaining valve core stability.

[0046] In the present invention, the oil inlet end of the upper valve body 1 is fixedly connected to an oil inlet pipe joint 12, and the oil outlet end of the lower valve body 2 is fixedly connected to an oil outlet pipe joint 23. Both the oil inlet pipe joint 12 and the oil outlet pipe joint 23 adopt a pagoda head structure with outwardly protruding barbs on the outer wall. The pagoda head joint design prevents the connection between the connecting pipe and the one-way valve from falling off, improves the strength of the connection between the pipe and the one-way valve, and ensures a reliable connection.

[0047] In the present invention, a sealing groove 13 is provided on the oil inlet pipe joint 12 and the oil outlet pipe joint 23, and a sealing ring 5 is provided in the sealing groove 13. The sealing ring 5 is installed in the sealing groove 13 to ensure the sealing and safety of the connection with the pipeline.

[0048] In the present invention, the cross-section of the sealing ring 5 is any one of a circle, an ellipse, a rectangle or a trapezoid. Preferably, the cross-section of the sealing ring 5 is a circle.

[0049] When the present invention is in use, the one-way valve action mechanism is as follows:

[0050] When the fuel pump starts working, the pressure at the oil inlet end of the upper valve body 1 is greater than the pressure at the oil outlet end of the lower valve body 2. At this time, under the action of the pressure difference, the spring 33 of the valve core assembly 3 begins to compress the one-way valve to open. At this time, the rubber valve core 31 separates from the sealing inclined surface 11 of the upper valve body 1, and the fuel flows through the gap between the upper valve body 1 and the rubber valve core 31.

[0051] When the oil pump stops working, the pressure at the oil outlet of the lower valve body 2 is greater than or equal to the pressure at the oil inlet of the upper valve body 1. At this time, the spring 33 returns to the assembled state; the one-way valve closes, the oil tank stops outputting fuel and prevents fuel from flowing back into the tank.

[0052] The parts not involved in this technical solution can be implemented using existing technologies.

[0053] The basic principles, main features, and characteristics of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A conductive fuel check valve assembly for dual fuel tanks, characterized in that: The fuel one-way valve assembly comprises an upper valve body (1), a lower valve body (2), a valve core assembly (3), and a conductive sleeve (4); wherein, The lower part of the upper valve body (1) and the upper part of the lower valve body (2) are both open cavity structures; The upper outer wall of the lower valve body (2) and the lower outer wall of the upper valve body (1) form a closed connection; A valve core assembly (3) is provided in the inner cavity of the lower valve body (2); The upper portion of the valve core assembly (3) blocks the inner cavity edge of the upper valve body (1), and forms a one-way flow passage between the upper valve body (1) and the lower valve body (2), flowing from the upper valve body (1) to the lower valve body (2); The upper outer wall of the lower valve body (2) and the lower outer wall of the upper valve body (1) are closed in the following manner: A first step (21) is provided on the outer wall of the lower valve body (2), and the outer shell of the upper valve body (1) falls on the first step (21); The outer wall surface of the lower valve body (2) close to the upper valve body (1) is flush with the outer wall surface of the upper valve body (1), and a circle of conductive sleeve (4) is provided on the outside of the junction of the upper valve body (1) and the lower valve body (2); An outwardly protruding blocking boss (22) is provided on the outer wall of the lower valve body (2), and the conductive sleeve (4) abuts against one side of the blocking boss (22); The conductive sleeve (4) is interference-fitted with the outer walls of the upper valve body (1) and the lower valve body (2), and the joints between the conductive sleeve (4) and the upper valve body (1) and the lower valve body (2) are sealed by welding; The upper valve body (1), the lower valve body (2) and the conductive sleeve (4) form an integral conductor; The valve core assembly (3) comprises a rubber valve core (31), a plastic valve core (32), and a spring (33); The rubber valve core (31) is clamped inside the plastic valve core (32); The outer wall of the plastic valve core (32) is slidably matched with the inner cavity of the lower valve body (2) so that the plastic valve core (32) slides along the inner wall of the lower valve body (2); The spring (33) is installed in the lower valve body (2), one end of the spring (33) abuts against the end of the inner cavity of the lower valve body (2) away from the upper valve body (1), and the other end of the spring (33) abuts against the plastic valve core (32) to push the plastic valve core (32) toward the upper valve body (1).

2. The conductive fuel check valve assembly for dual fuel tanks according to claim 1, characterized in that: The upper valve body (1), the lower valve body (2), and the conductive sleeve (4) are made of conductive nylon material.

3. The conductive fuel check valve assembly for dual fuel tanks according to claim 1, characterized in that: The rubber valve core (31) includes a shuttle cone-shaped valve cone head (311), and the inner cavity of the upper valve body (1) is provided with a sealing bevel (11). The upper part of the valve core assembly (3) forms a seal against the edge of the inner cavity of the upper valve body (1) by the outer wall conical surface of the valve cone head (311) being attached to the sealing bevel (11) on the inner cavity of the upper valve body (1) to form a sealing fit.

4. The conductive fuel check valve assembly for dual fuel tanks according to claim 1, characterized in that: A first groove (312) is provided on the outer wall of the rubber valve core (31); The plastic valve core (32) comprises a clamping ring (321), a support column (322), and a tail ring (323) which are integrally formed in sequence; The clamping ring (321) is clamped in the first groove (312) of the rubber valve core (31), the support column (322) is fixedly connected to the circumference of the clamping ring (321), and the outer wall size of the support column (322) is larger than the outer wall size of the rubber valve core (31), the outer wall of the support column (322) is fitted on the inner wall of the lower valve body (2), and gaps are provided between adjacent support columns (322), so that a gap for fuel to flow through is formed between the outer wall of the rubber valve core (31) and the inner wall of the lower valve body (2); The tail ring (323) is fixedly connected to the end of the support column (322) away from the clamping ring (321).

5. The conductive fuel check valve assembly for dual fuel tanks according to claim 4, characterized in that: The end of the rubber valve core (31) away from the valve cone head (311) is provided with a tail column (313); A transition slope is provided between the tail column (313) and the first groove (312); The tail post (313) is located on the central axis of the rubber valve core (31).

6. The conductive fuel check valve assembly for dual fuel tanks according to claim 1, characterized in that: The oil inlet end of the upper valve body (1) is fixedly connected to an oil inlet pipe joint (12); The oil outlet end of the lower valve body (2) is fixedly connected to an oil outlet pipe joint (23); The oil inlet pipe joint (12) and the oil outlet pipe joint (23) both adopt a pagoda head structure with an outwardly protruding barb structure provided on the outer wall.

7. The conductive fuel check valve assembly for dual fuel tanks according to claim 6, characterized in that: The oil inlet pipe joint (12) and the oil outlet pipe joint (23) are provided with sealing grooves (13), and a sealing ring (5) is provided in the sealing grooves (13).

8. The conductive fuel check valve assembly for dual fuel tanks according to claim 7, characterized in that: The cross-sectional shape of the sealing ring (5) is any one of a circle, an ellipse, a rectangle or a trapezoid.

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