Oil tank cover and oil tank
By setting up a piston cylinder and buffer chamber in the fuel tank cover, and using the piston plate and elastic parts to control the steam pressure balance, the safety hazards during pressure relief of the fuel tank cover are solved, and safe and reliable pressure control is achieved.
Patent Information
- Application Number
- CN202421869559.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-02
AI Technical Summary
When the existing fuel tank cover is relieved, excessive steam pressure can easily cause damage to surrounding personnel and equipment. The difference between the pressure in the fuel tank and the external pressure will lead to deformation of the fuel tank and fuel leakage, which poses safety hazards.
A fuel tank cover is designed, including a piston cylinder and a buffer chamber, which controls the communication between the ventilation hole and the pressure relief hole through the piston plate. The steam pressure is mixed with the atmospheric pressure in the buffer chamber and then discharged. The piston plate is driven by elastic parts to achieve pressure balance to prevent fuel leakage and hole blockage.
Effectively reduce the steam discharge pressure, avoid damage to equipment and personnel, balance the pressure in the fuel tank with atmospheric pressure, prevent the oil tank from deformation and fuel leakage, and improve safety and reliability.
Smart Images
Figure CN223085837U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fuel tanks, in particular to a fuel tank cap and a fuel tank. Background Art
[0002] In the modern automotive industry, with the increasingly strict environmental protection regulations, the emission standards for light-duty vehicles are also constantly improving. As a key equipment for the emission performance experiment of light-duty vehicles, refueling trolleys play a crucial role. However, during the long-term storage of fuel in the large-capacity fuel tanks equipped inside the existing refueling trolleys, due to the combined action of various factors, such as the long-term retention of fuel in the fuel tank and the oscillation of fuel during the movement of the refueling trolley, a large amount of fuel vapor will be generated inside the fuel tank. If these fuel vapors accumulate inside the fuel tank for a long time, it will not only possibly affect the quality of the fuel, but also increase the pressure inside the fuel tank due to the accumulation of fuel vapors, and even cause safety accidents such as combustion or explosion in some extreme cases, causing damage to personnel and equipment.
[0003] The traditional means of controlling the fuel tank pressure is to open a ventilation hole and a pressure relief hole on the fuel tank cap, and directly discharge the high pressure inside the fuel tank through the pressure relief hole by using a ventilation valve to balance the pressure inside the fuel tank. However, when the traditional fuel tank cap relieves pressure, the steam pressure discharged instantaneously through the pressure relief hole is too large, which is likely to cause damage to the surrounding personnel and equipment. At the same time, due to the sudden decrease in the pressure inside the fuel tank and the untimely exchange with the atmospheric pressure, the fuel tank will be deformed, affecting its use. During pressure relief, a small amount of fuel will be discharged through the pressure relief hole, resulting in fuel leakage and easily causing blockage of the pressure relief hole, posing a safety hazard. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a fuel tank cap and a fuel tank to solve the problems in the prior art that directly relieving pressure of the fuel tank cap easily leads to too large steam pressure being discharged, which is likely to cause damage to the surrounding personnel and equipment, and at the same time, the pressure difference between the inside and outside of the fuel tank is large, easily causing deformation of the fuel tank and fuel leakage, thus posing a safety hazard.
[0005] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:
[0006] A fuel tank cap includes a fuel tank cap body. A piston cylinder is fixed inside the fuel tank cap body. A piston plate is movably connected inside the piston cylinder. A ventilation hole communicating with the fuel tank is formed on the bottom plate of the piston cylinder. A first pressure relief hole communicating with the outside is formed on the side wall of the piston cylinder. The piston plate can slide axially inside the piston cylinder to make the ventilation hole communicate or not communicate with the first pressure relief hole;
[0007] A buffer chamber is formed between the outer wall of the piston cylinder and the main body of the fuel tank cap. The buffer chamber is communicated with the piston cylinder through a first pressure relief hole. A second pressure relief hole is formed on the side wall of the main body of the fuel tank cap. The buffer chamber is communicated with the outside through the second pressure relief hole.
[0008] According to the above technical means, by setting up the buffer chamber, the steam pressure discharged from the fuel tank is first mixed with the atmospheric pressure in the buffer chamber and then discharged, so as to balance the pressure of the fuel tank, reduce the steam pressure discharged to the outside, avoid the damage caused by the discharged steam to the surrounding personnel and equipment, and under the buffering effect of the buffer chamber, the pressure in the fuel tank and the atmospheric pressure can be exchanged in time, reduce the pressure difference between the pressure in the fuel tank and the atmospheric pressure outside, so that the pressure in the fuel tank can be slowly reduced to avoid sudden deformation of the fuel tank due to pressure changes, and at the same time prevent fuel leakage, avoid blockage of the first pressure relief hole and the second pressure relief hole in the fuel tank, with simple structure, convenient operation, high safety and reliability.
[0009] Further, an elastic member is installed on the piston plate. The end of the elastic member away from the piston plate is fixed on the inner wall of the piston cylinder. The elastic member can drive the piston plate to move axially along the piston cylinder.
[0010] According to the above technical means, by setting up the elastic member to provide a driving force for the piston plate to reset, when the steam pressure in the fuel tank is too high, the steam pressure enters the piston cylinder through the vent hole and pushes the piston plate to slide in the direction away from the vent hole, so that the vent hole is communicated with the first pressure relief hole, and the steam pressure is discharged to the buffer chamber through the first pressure relief hole for buffering, and then discharged through the second pressure relief hole. When the steam pressure in the fuel tank is balanced with the atmospheric pressure, the piston plate slides in the direction close to the vent hole under the action of its own gravity and the elastic member, so that the vent hole is not communicated with the first pressure relief hole to prevent fuel leakage in the fuel tank, with simple structure and convenient operation.
[0011] Further, the elastic member is a helical spring.
[0012] According to the above technical means, the helical spring has the advantages of good elasticity, strong load capacity, simple structure, easy manufacturing and use, good adjustment performance, wide application, high reliability and durability, and good corrosion resistance. When the steam pressure in the fuel tank is too high and the steam pressure is discharged to the buffer chamber through the first pressure relief hole for buffering, the helical spring is in a compressed or stretched state. When the steam pressure in the fuel tank is balanced with the atmospheric pressure, the helical spring is in a natural state.
[0013] Further, the top end of the piston cylinder is open and communicated with the buffer chamber.
[0014] According to the above technical means, the top end of the piston cylinder is connected to the buffer chamber through an opening, enabling the piston plate to work properly within the piston cylinder and having the effect of accelerating the alternation of the air pressure in the buffer chamber, the steam pressure in the piston cylinder, and the external atmospheric pressure during the movement of the piston plate, so as to control the steam pressure in the fuel tank.
[0015] Furthermore, a limiting protrusion is fixed on the inner wall of the piston cylinder. The limiting protrusion is located between the first pressure relief hole and the opening and can abut against the side of the piston plate away from the ventilation hole.
[0016] According to the above technical means, the limiting protrusion is used to limit the maximum displacement of the piston plate moving away from the ventilation hole, preventing the piston plate from detaching from the piston cylinder and also avoiding the piston plate from shifting.
[0017] Furthermore, the side surface of the piston plate that is in sliding contact with the inner wall of the piston cylinder is a smooth arc surface.
[0018] According to the above technical means, the side surface of the piston plate being a smooth arc surface can reduce the contact area with the inner wall of the piston cylinder, reduce friction, and at the same time achieve a better sealing effect.
[0019] Furthermore, the number of the ventilation holes is two or more, and each of the ventilation holes is evenly distributed around the central axis of the piston cylinder.
[0020] According to the above technical means, multiple ventilation holes enable the steam in the fuel tank to freely flow through the ventilation holes between the fuel tank and the piston cylinder, while ensuring uniform force on the piston cylinder to balance the pressure in the fuel tank.
[0021] Furthermore, the first pressure relief hole and the second pressure relief hole are oppositely arranged on the same horizontal line and have the same aperture.
[0022] According to the above technical means, the first pressure relief hole and the second pressure relief hole make the fuel tank cap receive uniform force in the horizontal direction and prevent it from tilting, so as to ensure the quality and effect of pressure relief.
[0023] A fuel tank includes the above fuel tank cap, and the fuel tank cap body is covered on the fuel tank.
[0024] Furthermore, the fuel tank cap body and the fuel tank are hermetically connected through a threaded structure.
[0025] According to the above technical means, the fuel tank cap body and the fuel tank are connected through a threaded structure, which has a simple structure and a good connection effect.
[0026] The beneficial effects achieved by the present utility model:
[0027] The utility model balances the fuel tank pressure by arranging a buffer chamber, so that the steam pressure discharged from the fuel tank is first mixed with the atmospheric pressure in the buffer chamber and then discharged, reducing the steam pressure discharged to the outside, avoiding the damage to the surrounding personnel and equipment caused by the discharged steam, and under the buffering action of the buffer chamber, the pressure in the fuel tank can be exchanged with the atmospheric pressure in time, reducing the pressure difference between the pressure in the fuel tank and the atmospheric pressure outside, enabling the pressure in the fuel tank to decrease slowly, so as to avoid sudden deformation of the fuel tank due to pressure change, and at the same time preventing fuel leakage and avoiding blockage of the first pressure relief hole and the second pressure relief hole in the fuel tank. It has a simple structure, is easy to operate, and has high safety and reliability. Brief Description of the Drawings
[0028] Figure 1 It is a cross-sectional view of the whole of the utility model.
[0029] Wherein, 1 - fuel tank cover body; 11 - second pressure relief hole; 2 - piston cylinder; 21 - piston plate; 22 - ventilation hole; 23 - first pressure relief hole; 24 - elastic member; 25 - limit projection; 3 - buffer chamber.
[0030] The drawings are only for illustrative purposes and should not be construed as a limitation of this patent; for a better illustration of this embodiment, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the same or similar reference numerals correspond to the same or similar components; the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation of this patent. Detailed Embodiments
[0031] It should be noted that, without conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other. The detailed descriptions in the specific embodiments should be understood as the explanatory illustration of the purpose of this application and should not be regarded as an improper limitation of this application.
[0032] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the following will further describe the specific technical solutions of this application in detail with reference to the drawings in the embodiments of this application. The following embodiments are used to illustrate this application, but not to limit the scope of this application.
[0033] In the embodiments of this application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of this application, unless otherwise specified, the meaning of "a plurality" is two or more.
[0034] In the embodiments of the present application, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be directly connected or indirectly connected through an intermediate medium.
[0035] In the embodiments of the present application, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element.
[0036] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.
[0037] The technical solutions of the present utility model will be described in detail below with reference to specific drawings.
[0038] In this embodiment, a fuel tank cap, as Figure 1 shown, includes a fuel tank cap body 1. A piston cylinder 2 is fixedly arranged in the fuel tank cap body 1. A piston plate 21 is movably connected in the piston cylinder 2. A ventilation hole 22 communicating with the fuel tank is formed on the bottom plate of the piston cylinder 2. A first pressure relief hole 23 communicating with the outside is formed on the side wall of the piston cylinder 2. The piston plate 21 can slide axially in the piston cylinder 2 to make the ventilation hole 22 communicate with or disconnect from the first pressure relief hole 23. A buffer chamber 3 is formed between the outer wall of the piston cylinder 2 and the fuel tank cap body 1. The buffer chamber 3 communicates with the piston cylinder 2 through the first pressure relief hole 23. A second pressure relief hole 11 is formed on the side wall of the fuel tank cap body 1. The buffer chamber 3 communicates with the outside through the second pressure relief hole 11.
[0039] In this embodiment, by providing a buffer chamber 3, the steam pressure discharged from the fuel tank is first mixed with the atmospheric pressure in the buffer chamber 3 and then discharged, so as to balance the pressure of the fuel tank, reduce the steam pressure discharged to the outside, avoid the damage caused by the discharged steam to the surrounding personnel and equipment, and under the buffering effect of the buffer chamber, the pressure in the fuel tank and the atmospheric pressure can be exchanged in time, reduce the pressure difference between the pressure in the fuel tank and the atmospheric pressure outside, so that the pressure in the fuel tank can be slowly reduced to avoid sudden deformation of the fuel tank due to pressure changes, and at the same time prevent fuel leakage and avoid blockage of the first pressure relief hole 23 and the second pressure relief hole 11 in the fuel tank;
[0040] It can be understood that the piston plate 21 divides the cavity in the piston cylinder 2 into an upper cavity and a lower cavity. Among them, the lower cavity can communicate with the fuel tank through the vent hole 22. The volumes of the upper cavity and the lower cavity change as the piston plate 21 slides axially in the piston cylinder 2, so that the first pressure relief hole 23 is located in the upper cavity or the lower cavity. Specifically, when the steam pressure in the fuel tank is balanced, the first pressure relief hole 23 is located in the upper cavity. When the steam pressure in the fuel tank is too high, the first pressure relief hole 23 is located in the lower cavity;
[0041] As a preferred embodiment, the number of vent holes 22 is two or more, and the vent holes 22 are evenly distributed around the central axis of the piston cylinder 2; so that the steam in the fuel tank can freely flow through the vent holes between the fuel tank and the piston cylinder, and at the same time ensure that the piston cylinder is evenly stressed to balance the pressure in the fuel tank;
[0042] As a preferred embodiment, the first pressure relief hole 23 and the second pressure relief hole 11 are oppositely arranged on the same horizontal line and have the same aperture; so that the fuel tank cap is evenly stressed in the horizontal direction and will not tilt, to ensure the pressure relief quality and effect;
[0043] During use, when the steam pressure in the fuel tank is too high, the high-pressure steam enters the lower cavity through the vent hole 22 and pushes the piston plate 21 to slide in the direction of the upper cavity, so that the volume of the lower cavity becomes larger and the volume of the upper cavity becomes smaller. When the piston plate 21 slides until the first pressure relief hole 23 is located in the lower cavity, the first pressure relief hole 23 communicates with the vent hole 22, and the high-pressure steam enters the buffer chamber 3 through the first pressure relief hole 23 and is buffered and then discharged to the outside through the second pressure relief hole 11 to balance the pressure in the fuel tank. When the pressure in the fuel tank decreases to balance with the outside, the piston plate 21 slides in the direction of the lower cavity under the action of its own gravity, so that the volumes of the lower cavity and the upper cavity are reset, and the first pressure relief hole 23 is located in the upper cavity, and the first pressure relief hole 23 is not communicated with the vent hole 22, closing the pressure relief channel to prevent fuel leakage.
[0044] In this embodiment, an elastic member 24 is installed on the piston plate 21. One end of the elastic member 24 away from the piston plate 21 is fixed on the inner wall of the piston cylinder 2. The elastic member 24 can drive the piston plate 21 to move along the axial direction of the piston cylinder 2; as Figure 1 shown, the elastic member 24 is installed between the piston plate 21 and the inner wall of the piston cylinder 2. During use, the elastic member 24 provides a driving force for the piston plate 21 to return to its original position. As a preferred embodiment, the elastic member 24 is a helical spring. Specifically, when the steam pressure in the fuel tank is too high and the steam pressure is discharged through the first pressure relief hole 23 into the buffer chamber for buffering, the helical spring is in a compressed or stretched state. When the pressure in the fuel tank decreases, under the action of the self-gravity of the piston plate 21 and the reset of the helical spring, it can overcome the air pressure and slide downward towards the lower cavity, so that the first pressure relief hole 23 returns to the upper cavity. When the steam pressure in the fuel tank is balanced with the atmospheric pressure, the helical spring is in a natural state.
[0045] As a preferred embodiment, the top end of the piston cylinder 2 is open and communicates with the buffer chamber 3; the upper end of the upper cavity is open and communicates with the buffer chamber 3, so that the piston plate 21 can slide normally in the piston cylinder 2 to ensure normal operation, and during the movement of the piston plate, it has the effect of accelerating the alternation of the air pressure in the buffer chamber 3, the steam pressure in the piston cylinder 2 and the external atmospheric pressure, so as to control the steam pressure in the fuel tank.
[0046] As a preferred embodiment, a limiting protrusion 25 is fixed on the inner wall of the piston cylinder 2. The limiting protrusion 25 is located between the first pressure relief hole 23 and the opening and can abut against the side of the piston plate 21 away from the ventilation hole 22; the limiting protrusion 25 is used to limit the maximum displacement of the piston plate 21 moving away from the ventilation hole 22 to prevent the piston plate 21 from detaching from the piston cylinder 2 and at the same time avoid the piston plate 21 from shifting.
[0047] As a preferred embodiment, the side surface of the piston plate 21 in sliding contact with the inner wall of the piston cylinder 2 is a smooth arc surface; the side surface of the piston plate 21 is a smooth arc surface, which can reduce the contact area with the inner wall of the piston cylinder 2, reduce friction, and at the same time achieve a better sealing effect.
[0048] As another embodiment of the present invention, a fuel tank includes the above-mentioned fuel tank cap, and the fuel tank cap body 1 is covered on the fuel tank.
[0049] The fuel tank cap body 1 is covered on the fuel tank and is hermetically connected to the fuel tank. During use, when the steam pressure in the fuel tank is too high, the high-pressure steam enters the lower cavity through the vent hole 22, and pushes the piston plate 21 to slide towards the upper cavity while compressing or stretching the helical spring, so that the first pressure relief hole 23 is communicated with the vent hole 22. The high-pressure steam enters the buffer cavity 3 through the first pressure relief hole 23, is buffered and then discharged to the outside through the second pressure relief hole 11 to balance the pressure in the fuel tank. When the pressure in the fuel tank decreases to be balanced with the outside, the piston plate 21 resets under the action of its own gravity and the elastic force of the helical spring, so that the first pressure relief hole 23 is located in the upper cavity, and the first pressure relief hole 23 is not communicated with the vent hole 22, closing the pressure relief channel to prevent fuel leakage; As a preferred embodiment, the fuel tank cap body 1 and the fuel tank are hermetically connected through a threaded structure, and the threaded structure is an internal thread and an external thread.
[0050] The serial numbers of the above embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.
Claims
1. A fuel tank cap, characterized in that, It includes a fuel tank cap body (1). A piston cylinder (2) is fixed inside the fuel tank cap body (1). A piston plate (21) is movably connected inside the piston cylinder (2). An air vent hole (22) that can communicate with the fuel tank is formed on the bottom plate of the piston cylinder (2). A first pressure relief hole (23) that can communicate with the outside is formed on the side wall of the piston cylinder (2). The piston plate (21) can slide axially inside the piston cylinder (2) to make the air vent hole (22) communicate or not communicate with the first pressure relief hole (23). A buffer cavity (3) is formed between the outer wall of the piston cylinder (2) and the fuel tank cap body (1). The buffer cavity (3) is communicated with the piston cylinder (2) through the first pressure relief hole (23). A second pressure relief hole (11) is formed on the side wall of the fuel tank cap body (1). The buffer cavity (3) is communicated with the outside through the second pressure relief hole (11).
2. The fuel tank cap according to claim 1, characterized in that, An elastic member (24) is installed on the piston plate (21). The end of the elastic member (24) away from the piston plate (21) is fixed on the inner wall of the piston cylinder (2). The elastic member (24) can drive the piston plate (21) to move axially along the piston cylinder (2).
3. The fuel tank cap according to claim 2, characterized in that, The elastic member (24) is a helical spring.
4. A fuel tank cap according to claim 1, characterized in that, The top end of the piston cylinder (2) is open and communicated with the buffer cavity (3).
5. A fuel tank cap according to claim 4, characterized in that, A limiting protrusion (25) is fixed on the inner wall of the piston cylinder (2). The limiting protrusion (25) is located between the first pressure relief hole (23) and the opening and can abut against the side of the piston plate (21) away from the air vent hole (22).
6. The fuel tank cap according to claim 1, characterized in that, The side surface of the piston plate (21) in sliding contact with the inner wall of the piston cylinder (2) is a smooth arc surface.
7. A fuel tank cap according to claim 1, characterized in that, The number of the air vent holes (22) is two or more, and each of the air vent holes (22) is evenly distributed around the central axis of the piston cylinder (2).
8. The fuel tank cap according to claim 1, characterized in that, The first pressure relief hole (23) and the second pressure relief hole (11) are oppositely arranged on the same horizontal line and have the same aperture.
9. A fuel tank, characterized in that, It includes the fuel tank cap according to any one of claims 1-8, and the fuel tank cap body (1) is covered on the fuel tank.
10. A fuel tank according to claim 9, characterized in that, The fuel tank cap body (1) and the fuel tank are hermetically connected through a threaded structure.