A circulation flow control valve for vehicle

Abstract

The present invention provides a vehicle circulation flow control valve for use in an automobile fuel supply system. The circulation flow control valve includes a flange cover, a cover plate, a spring, a valve core, and a through pipe. The flange cover is connected to the interior of the through pipe to form an accommodating space. One end of the accommodating space is an annular stopper of the through pipe, and the other end of the accommodating space is the bottom of the flange cover. The cover plate, spring, and valve core are sequentially arranged in the accommodating space. One side of the valve core is connected to the annular stopper, one end of the spring is connected to the valve core, and the other end of the spring is connected to the cover plate. The product of the present application has a simple and practical component structure, which can better control the performance of the product without significantly increasing the cost.

Description

Technical Field

[0001] The invention relates to an automobile accessory, in particular to a circulation flow control valve used in an automobile fuel supply system and installed on a fuel tank. Background Art

[0002] When refueling a car, a large amount of fuel quickly fills the entire tank. The circulating flow control valve, along with the refueling limit valve and the dump valve, acts as a venting valve. Furthermore, since the circulating flow control valve is open to the outside atmosphere when the fuel pump trips, it effectively prevents potential backflow from excessive tank pressure. The existing circulating flow control valve is welded to the fuel tank, connecting the tank to the outside through a constant diameter pipe, allowing ventilation during refueling and balancing the internal tank pressure.

[0003] Current operating status of circulating flow control valves: The circulating flow control valves currently used on China V vehicles only function to connect to the fuel filler port, allowing for the recycling of oil and gas during refueling and reducing emissions to the atmosphere. These circulating flow control valves have relatively large orifices. With the implementation of the China VI fuel evaporative emissions policy, stricter emission requirements have led to the widespread use of smaller-diameter circulating flow control valves instead of larger ones. The remaining oil and gas flows through the refueling limit valve and the dump valve to the carbon tube, where they are absorbed by the activated carbon inside and supplied to the engine for combustion. However, the drawback of this system is that after the fuel injector is released, the internal pressure of the fuel tank cannot be quickly relieved, resulting in fuel backflow from the fuel filler port.

[0004] The existing circulation flow control valve has the following defects in actual use:

[0005] (1) The valve always maintains a constant passage in any state. Therefore, when refueling, when the fuel tank is under high pressure, the gas cannot be discharged quickly due to the small valve passage, and the pressure relief speed is slow. This problem usually occurs at the moment of refueling gun jumping. Due to the closure of the refueling limit valve, the small ventilation pipeline of the rollover valve and the circulation flow control valve cannot achieve rapid pressure relief, which may cause oil backflow and other phenomena.

[0006] Therefore, there is still room for improvement in the circulation flow control valve in the prior art. Summary of the Invention

[0007] In view of the above defects, the purpose of the present invention is to provide a circulation flow control valve with a simple structural design. At the moment of refueling gun jumping, the circulation flow control valve can open the maximum passage to achieve rapid pressure relief and prevent oil backflow, so as to solve the problems of the existing technology.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A vehicle circulation flow control valve is used in an automobile fuel supply system. The circulation flow control valve includes a flange cover, a cover plate, a spring, a valve core and a through pipe. The flange cover is connected to the inside of the through pipe to form an accommodating space. One end of the accommodating space is the annular stopper of the through pipe, and the other end of the accommodating space is the cover bottom of the flange cover. The cover plate, spring and valve core are arranged in the accommodating space in sequence. One side of the valve core is connected to the annular stopper, one end of the spring is connected to the valve core, and the other end of the spring is connected to the cover plate.

[0010] Furthermore, the flange cover includes an air outlet pipe, the cover plate includes a cover body with a notch and a connecting column, the notch of the cover body corresponds to the air outlet pipe, and the connecting column is connected to the spring.

[0011] Furthermore, the valve core includes a valve core bottom plate with a bottom plate through hole in the middle, multiple guide plates and a valve core bottom support with a bottom support through hole in the middle. The valve core bottom plate, multiple guide plates and valve core bottom support are integrally formed.

[0012] Furthermore, the guide plate includes a support portion protruding radially inward and a guide portion protruding radially outward, the support portion is connected to one end of the spring, and the guide portion is connected to the inner wall of the accommodating space.

[0013] Furthermore, the flange cover is snap-fitted and connected to the through pipe.

[0014] The design concept of this application is to improve the existing series of circulating flow control valves to avoid the back-spray phenomenon, add a simple flow control valve in the circulating flow control valve to control the flow, maintain small-diameter exhaust when the air pressure is low, and turn it into large-diameter exhaust when the air pressure is high. The main purpose is to increase oil and gas control and quickly relieve the pressure in the fuel tank after the gun jumps during refueling.

[0015] Due to the adoption of the above technical features, the present invention has the following advantages and positive effects compared with the prior art:

[0016] First, at the moment the refueling gun jumps, the refueling limit valve is closed, and when the pressure increases rapidly, the circulation flow control valve can open the maximum passage to achieve rapid pressure relief and prevent oil backflow;

[0017] Second, the cover plate, valve core and spring are used to control the flow and achieve rapid pressure relief through rapid switching of different cross sections;

[0018] Third, the structure of product components is simple and practical, which can better control product performance without significantly increasing costs.

[0019] Of course, any specific embodiment of the present invention does not necessarily have all of the above technical effects at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of the circulation flow control valve of this application;

[0021] Figure 2 This is an exploded view of the circulation flow control valve of this application;

[0022] Figure 3 A cross-sectional view of the circulation flow control valve of this application;

[0023] Figure 4 for Figure 3 An enlarged view of the storage space;

[0024] Figure 5 A perspective view of the cover plate of this application;

[0025] Figure 6 A three-dimensional diagram of the valve core of this application;

[0026] Figure 7 This is another oil and gas flow diagram of the present application;

[0027] Figure 8 This is another oil and gas flow diagram of this application. DETAILED DESCRIPTION

[0028] Several preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention encompasses any alternatives, modifications, equivalent methods, and solutions that are not inconsistent with the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and the like are not described in detail.

[0029] Please refer to Figure 1 and Figure 2 The three-dimensional diagram and exploded diagram of the circulation flow control valve of the present application disclose a vehicle circulation flow control valve for use in an automobile fuel supply system. The flange cover 10 of the circulation flow control valve of the present application is installed on a fuel tank (not shown). Under low pressure and low flow conditions, due to the elastic force of the spring 30, the contact surface between the valve core 40 and the through pipe 50 is in a sealed state, and oil vapor only flows out through the central hole of the valve core 40; when the pressure in the fuel tank increases, the valve core 40 is gradually opened by the steam thrust, and at this time, the oil vapor flows out through the central hole of the valve core 40 and a circle of passages around it after it is opened; when the pressure reaches a higher value, the thrust received by the valve core 40 is sufficient to push it to the upper end cover plate 20, and at this time the purpose of instantaneous pressure rapid pressure relief is achieved.

[0030] like Figure 2 、 Figure 3 and Figure 4 As shown, the circulation flow control valve includes a flange cover 10, a cover plate 20, a spring 30, a valve core 40 and a through pipe 50. The flange cover 10 is connected to the through pipe 50 to form an accommodating space 60. One end of the accommodating space 60 ( Figure 3 The lower end of the through pipe 50 is the annular stopper 51, and the other end of the accommodating space 60 ( Figure 3 The upper end in the figure) is the cover bottom 11 of the flange cover 10, and the cover plate 20, spring 30 and valve core 40 are arranged in the accommodating space in sequence. One side of the valve core 40 is connected to the annular stopper 51. Under the condition of low pressure and low flow, under the elastic force of the spring 30, the contact surface between the valve core 40 and the annular stopper 51 is in a sealed state; one end of the spring 30 is connected to the valve core 40, and the other end of the spring 30 is connected to the cover plate 20. After assembly, the spring 30 is in a compressed state to press the valve core 40 against the annular stopper 51.

[0031] Please refer to Figure 2 、 Figure 3 and Figure 5 The flange cover 10 includes an outlet pipe 12 and an inlet pipe 13. The outlet pipe 12 is used to discharge the oil and gas in the oil tank through the inlet pipe 13. The cover plate 20 includes a cover body 21 with a notch and a connecting column 22. The notch of the cover body 21 corresponds to the outlet pipe 12. The design of the notch can improve the discharge efficiency of the oil and gas. The notch facing the outlet pipe 12 facilitates the direct discharge of the oil and gas. The connecting column 22 is connected to the spring 30. Figure 4 In the figure, the place where the connecting column 22 and the spring 30 are connected is a step, and the spring 30 is more firmly connected against the step. The end of the connecting column 22 is designed to be conical to facilitate the insertion of the spring 30. In order to guide the oil and gas, the cone at the end of the connecting column 22 is a combination of triangular sheets. Compared with a solid cone, this hollow cone is more suitable for the circulation of oil and gas.

[0032] like Figure 4 and Figure 5 As shown, the cover body 21 is a cup-shaped body with a notch. The connection requirement of the cover plate 20 is to be able to support the spring and the notch should face the outlet pipe 12. Therefore, the cover plate 20 can be fixed to the cover bottom 11 of the flange cover 10, or the cover plate 20 can be fixed to the through pipe 50. In the embodiment of the present application, the cover plate 20 is fixed to the through pipe 50. Such a design makes it easier to assemble the flange cover 10 and the through pipe 50. Figure 4In the embodiment, a raised ring is provided on the radial cup edge of the cover body 21, and an annular groove is provided on the inner edge of the through pipe 50. When assembling, the raised ring is snapped into the annular groove, so that the cover plate 20 can be stably fixed on the through pipe 50, and the notch faces the outlet pipe 12. Figure 2 In the embodiment, the through-tube 50 is provided with a through-tube notch corresponding to the notch of the cover body 21, and ribs are provided on the tube wall below the through-tube notch to improve the tube wall strength below the through-tube notch, thereby improving the ability to resist atmospheric airflow.

[0033] like Figure 1 and Figure 2 As shown, the flange cover 10 is snap-fitted to the through pipe 50. The air inlet pipe 13 of the flange cover 10 and the through pipe 50 are connected in such a manner that a plurality of latching protrusions are provided on the outer surface of the air inlet pipe 13, and a snap ring including a plurality of latching holes is provided on the through pipe 50 at positions corresponding to the plurality of latching protrusions. During assembly, the through pipe 50 is inserted into the air inlet pipe 13, and the plurality of latching protrusions are aligned and snapped into the plurality of latching holes, so that the flange cover 10 and the through pipe 50 can be firmly connected. After connection, oil and gas enter from the through pipe 50, pass through the valve core 40 and the cover plate 20, and are discharged from the air outlet pipe 12.

[0034] like Figure 4 and Figure 6 As shown, the valve core 40 includes a valve core bottom plate 41 with a bottom plate through hole 411 in the middle, multiple guide plates 42 and a valve core bottom support 43 with a bottom support through hole 431 in the middle. The valve core bottom plate 41, multiple guide plates 42 and valve core bottom support 43 are made of one piece. The diameter of the bottom support through hole 431 is smaller than the diameter of the bottom plate through hole 411. Under low pressure and low flow conditions, oil and gas enter the bottom plate through hole 411 from the bottom support through hole 431 and eventually flow to the exhaust pipe 12 for discharge. At this time, due to the elastic force of the spring 30, the contact surface between the valve core 40 and the annular stopper 51 of the through pipe 50 is in a sealed state; as the fuel enters, the pressure of the oil and gas is increased, and after overcoming the elastic force of the spring 30, the valve core 40 is gradually pushed upward, and a gap is gradually generated between the contact surfaces of the valve core 40 and the annular stopper 51 of the through pipe 50, and the gap gradually expands. The process of gradual expansion of the gap is the process of gradual expansion of the exhaust port diameter, and when the valve core 40 reaches the upper end of the cover plate 20, instantaneous pressure is quickly released.

[0035] Please refer to Figure 4 and Figure 6The three-dimensional view of the valve core of the present application shows that the guide plate 42 includes a support portion 421 protruding radially inward and a guide portion 422 protruding radially outward. The support portion 421 is connected to one end of the spring 30. The elastic force of the spring 30 is applied to the support portion 421, pressing the valve core 40 toward the annular stop portion 51 to obtain a sealed state. Oil and gas can only flow out from the central hole of the valve core 40. In addition, the guide portion 422 is connected to the inner wall of the accommodating space 60. Figure 4 In the embodiment, after assembly, the guide portion 422 fits against the inner wall of the accommodating space 60, forming a gap between the valve core bottom plate 41 and the inner wall of the accommodating space 60. When the oil and gas pressure is increased with the entry of fuel and the elastic force of the spring 30 is overcome, the valve core 40 is gradually pushed upward, and the oil and gas can quickly overflow from the gap between the valve core bottom plate 41 and the inner wall of the accommodating space 60.

[0036] See also Figure 3 、 Figure 7 and Figure 8 , shows a schematic diagram of the oil and gas flow of the circulating flow control valve in this application, the arrows in the figure indicate the direction of oil and gas flow, and the thickness of the arrows indicates the size of the oil and gas, as follows:

[0037] 1. Figure 3 The middle is a normal state. After assembly, the valve core 40 is located at the lower part of the accommodating space 60. The valve core base 43 of the valve core 40 abuts against the annular stopper 51 under the elastic force of the spring 30. The contact surface is in a sealed state. Under low pressure and low flow conditions, oil and gas pass through the base base through hole 431 into the bottom plate through hole 411 and eventually flow into the outlet pipe 12 for discharge.

[0038] 2. Figure 7 The middle state is when the oil and gas begin to increase and overcome the spring force. When the internal pressure of the oil tank exceeds the elastic force of the spring 30, the valve core 40 is gradually pushed upward, and a gap is gradually generated between the contact surface of the valve core 40 and the annular stopper 51 of the through pipe 50. Part of the oil and gas is discharged through the gap between the valve core 40 and the annular stopper 51.

[0039] 3. Figure 8 When the oil and gas pressure reaches a relatively high value, the valve core 40 is pushed against the cover plate 20 by the thrust, and the exhaust port diameter reaches the maximum at this time, thereby achieving the purpose of instantaneous pressure rapid relief; when the oil tank returns to a normal state, the valve core 40 falls back and resets under the elastic force of the spring 30, and rests on the annular stop portion 51.

[0040] The circulation flow control valve of the present application is enhanced in performance control. Compared with the single function of the previous circulation flow control valve, this product is more extensive and adaptable; the component structure of the circulation flow control valve of the present application is simple and practical, and the performance of the product can be better controlled without significantly increasing the cost. These advantages are all due to the change of the single air permeability of the traditional circulation flow control valve, and the addition of a movable valve core. Under low pressure and low flow conditions, oil and vapor only flow out through the central hole of the valve core 40; when the oil tank pressure increases, the valve core 40 gradually opens, and at this time, the oil and vapor flow out through the central hole of the valve core 40 and the surrounding passage after opening; when the pressure reaches a higher value, the passage of the valve core 40 is fully opened, and the purpose of instantaneous pressure rapid pressure relief is achieved at this time, realizing rapid pressure relief and preventing oil backflow.

[0041] It should be noted that in the description of the embodiments of the present application, the terms "front, rear", "left, right", "up, down", etc. indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present application. The terms "install", "connect", and "connected" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In summary, due to the adoption of the above technical features, the present invention has the following advantages and positive effects compared with the prior art:

[0043] First, at the moment the refueling gun jumps, the refueling limit valve is closed, and when the pressure increases rapidly, the circulation flow control valve can open the maximum passage to achieve rapid pressure relief and prevent oil backflow;

[0044] Second, the cover plate, valve core and spring are used to control the flow and achieve rapid pressure relief through rapid switching of different cross sections;

[0045] Third, the structure of product components is simple and practical, which can better control product performance without significantly increasing costs.

[0046] The preferred embodiments of the invention are only used to help illustrate the invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made based on the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the invention, so that those skilled in the art can make good use of the invention. The present invention is only limited by the claims and their full scope and equivalents. The above disclosure is only the preferred embodiment of the present invention, but it is not intended to limit itself. Any equivalent changes and modifications made by any person skilled in the art without violating the spirit and connotation of the invention should fall within the scope of protection of the present invention.

Claims

1. A vehicle circulation flow control valve, used in a vehicle fuel supply system, characterized in that: The circulation flow control valve includes a flange cover, a cover plate, a spring, a valve core and a through pipe, wherein the flange cover is connected to the interior of the through pipe to form an accommodating space, one end of the accommodating space is the annular stopper of the through pipe, and the other end of the accommodating space is the cover bottom of the flange cover, the cover plate, the spring and the valve core are sequentially arranged in the accommodating space, one side of the valve core is connected to the annular stopper, one end of the spring is connected to the valve core, and the other end of the spring is connected to the cover plate; The valve core includes a valve core bottom plate with a bottom plate through hole in the middle, a plurality of guide plates and a valve core bottom support with a bottom support through hole in the middle, wherein the diameter of the bottom support through hole is smaller than the diameter of the bottom plate through hole; The flange cover includes an air outlet pipe. Under low pressure and low flow conditions, oil and gas enter the bottom plate through-hole from the bottom support through-hole and flow to the air outlet pipe for discharge. After the pressure of the oil and gas overcomes the elastic force of the spring, the valve core is pushed upward, and the oil and gas quickly overflow from the gap between the valve core bottom plate and the inner wall of the accommodating space. The cover plate is fixed on the through pipe.

2. The vehicle circulation flow control valve according to claim 1, characterized in that: The cover plate includes a cover body with a notch and a connecting column, the notch of the cover body corresponds to the air outlet pipe, and the connecting column is connected to the spring.

3. The vehicle circulation flow control valve according to claim 2, characterized in that: The valve core bottom plate, the plurality of guide plates and the valve core bottom support are integrally formed.

4. The vehicle circulation flow control valve according to claim 3, characterized in that: The guide plate includes a support portion protruding radially inward and a guide portion protruding radially outward, the support portion is connected to one end of the spring, and the guide portion is connected to the inner wall of the accommodating space.

5. The vehicle circulation flow control valve according to claim 4, characterized in that: The flange cover is snap-fitted and connected to the through pipe.

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