Built-in oiling quantity-limiting control valve of oil tank

Abstract

The utility model provides an oil tank built-in refueling limit control valve, which comprises an upper cover, an upper shell, a base, a floater, a spring and a noise reduction pad, an inner sleeve of the base is hollow to form a third cavity, the floater is arranged in the third cavity, the spring is arranged between the floater and the base, and the floater can move up and down in the base through the spring. The noise reduction pad is arranged on the base of the spring inner ring, the top of the noise reduction pad can make contact with the bottom of the floater, a damping part is additionally arranged, and the opening and closing noise of the control valve can be reduced in the whole vehicle running process. The upper shell comprises a first cavity and a second cavity, the upper shell covers the base from top to bottom, the base and the floater cover the interior of the second cavity, and the upper cover covers the top of the first cavity of the upper shell; the overall size is small, and the device can be matched with fuel tank assemblies which are gradually flattened; the minimum reopening pressure gt of the control valve; and the ventilation capacity of a restarting pressure point is larger than 7 Lpm, and the high-pressure oil tank can be suitable for a high-pressure oil tank.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a fuel tank built-in refueling limit control valve. Background Art

[0002] The fuel tank's built-in refueling limit control valve is a key component of a car's fuel tank. It is mainly used to control the oil level in the tank. During the refueling process, when the fuel reaches the preset capacity of the tank, the refueling limit valve will automatically close to prevent the tank from overflowing due to over-refueling. At the same time, it can also ensure the sealing and safety of the tank to a certain extent.

[0003] For example, the patent documents with publication numbers CN113833862A and CN 219446725 U both disclose the structure of a refueling limit valve. However, the above structure has the following problems: (1) During the driving of the vehicle, the vehicle may be bumpy and unstable. At this time, the noise generated by the opening and closing of the float when it is vibrated is very loud, which affects the customer experience. (2) The opening pressure of the refueling limit valve of the existing high-pressure fuel tank is generally 30-35 kPa, which is relatively low. The ventilation volume after reopening is relatively small, and its volume is also relatively large. (3) Although the above structure has taken into account the miniaturization design of the fuel tank, its structure and height make the overall volume larger, which still cannot meet the design requirements of the flat fuel tank. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the shortcomings of the prior art refueling limit valve structure, such as high noise, low opening pressure and large volume, the utility model provides a fuel tank built-in refueling limit control valve.

[0005] The technical solution to be adopted by the utility model to solve its technical problems is: a fuel tank built-in refueling limit control valve, including an upper cover, an upper shell, a base, a float, a spring and a noise reduction pad, wherein the base includes an inner sleeve, the inner sleeve is hollow to form a third chamber, the float is arranged inside the third chamber of the inner sleeve, a spring is provided between the float and the base, and the spring can make the float move up and down inside the base, the noise reduction pad is arranged on the base of the inner ring of the spring, and the top of the noise reduction pad and the bottom of the float can contact each other; the upper shell is a hollow cylindrical structure, and the interior is divided into a first chamber and a second chamber arranged up and down by a partition, and the partition A first through hole connecting the first chamber and the second chamber is provided on the upper shell; the upper shell is covered on the base from top to bottom, and the base and the float cover are arranged inside; the side wall of the first chamber is provided with a first exhaust channel and a second exhaust channel connected thereto; the upper cover is covered on the top of the first chamber of the upper shell, and the upper cover and the upper shell are connected by laser welding; the overall height of the control valve is ≤60mm, and the liquid level closing height can reach 10-15mm from the head position of the fuel tank; the float and the spring form a valve core, and the valve core meets the maximum ventilation flow rate>300Lpm, that is, when the valve core is at a ventilation volume of 300Lpm, the spring will not lift the float to cause the valve body to close.

[0006] Furthermore, the float includes an FLVV first-stage float and an FLVV second-stage float. A first installation cavity is provided on the top of the FLVV first-stage float. The FLVV second-stage float is arranged in the first installation cavity and is detachably connected via a second snap-fit structure.

[0007] Furthermore, to facilitate connection and disassembly, the second buckle structure includes a second fixing buckle provided on the side wall of the first installation cavity, and a second protrusion provided on the side wall of the FLVV second-stage float. During installation, the second protrusion is embedded in the second fixing buckle.

[0008] Furthermore, in order to facilitate the installation of the spring and the coordination with the noise reduction pad, a second installation cavity and a flower-shaped hole are also provided at the bottom of the FLVV first-stage float. The second installation cavity is used to embed the spring; the flower-shaped hole is coaxially arranged inside the second installation cavity and is petal-shaped as a whole. The bottom of the flower-shaped hole can be connected to the noise reduction pad, and the top of the noise reduction pad is conical, which can be partially embedded in the flower-shaped hole without blocking the flower-shaped hole, thereby ensuring the flow of internal gasoline.

[0009] Furthermore, the FLVV second-stage float includes a rubber pad and a nylon cylinder. The rubber pad is arranged above the nylon cylinder, and the rubber pad and the nylon cylinder are connected by integral vulcanization. A third through hole is provided on the top of the rubber pad, and the third through hole is connected to the inner cavity of the nylon cylinder. The nylon cylinder is inserted in the first installation cavity.

[0010] Furthermore, the sidewall of the second chamber of the upper housing has multiple second through-holes arranged circumferentially along the sidewall. These second through-holes serve two purposes: one is for ventilation, and the other is to allow gasoline to enter the valve chamber (i.e., the second chamber) through these four holes as the tank level rises during refueling. Once gasoline enters the valve chamber, the buoyancy of the float rises, stopping refueling and controlling the refueling volume.

[0011] Furthermore, a float guide structure is provided on the upper shell and the base, and the float guide structure includes a first guide bar arranged above the inner wall of the second chamber of the upper shell, and a second guide bar arranged on the inner wall of the inner sleeve of the base. The first guide bar and the second guide bar are parallel to the axis, and there are multiple first guide bars and second guide bars, which are evenly distributed on the inner wall.

[0012] On the one hand, the first guide bar and the second guide bar have a guiding and limiting effect on the up and down movement of the float, ensuring its smooth and stable up and down movement; on the other hand, the first guide bar strengthens the upper shell and the second guide bar strengthens the inner sleeve; in addition, reinforcing ribs are also provided on the outer wall of the inner sleeve.

[0013] Furthermore, a first U-shaped opening and a second U-shaped opening are provided on the side wall of the inner sleeve of the base, and the first U-shaped opening and the second U-shaped opening are arranged radially opposite to each other for connecting the second chamber and the third chamber; an annular slot is provided on the base at the bottom of the inner sleeve, and the bottom of the upper shell is inserted into the annular slot and is detachably connected by a first snap-fit structure.

[0014] Furthermore, the first buckle structure includes a first protrusion arranged on the bottom of the upper shell, and a first fixing buckle arranged on the side wall of the annular slot of the base. During installation, the first protrusion is embedded in the first fixing buckle to connect and fix the upper shell to the base.

[0015] Furthermore, a third fixing buckle is provided on the upper shell, and the third fixing buckle cooperates with the metal bracket inside the oil tank to fix the control valve as a whole in the oil tank.

[0016] The beneficial effects of the present invention are as follows: the present invention provides a fuel tank built-in refueling limit control valve, (1) a shock-absorbing component is added, which can reduce the opening and closing noise of the control valve during vehicle driving, thereby optimizing the customer experience; (2) the control valve core (i.e., float and spring) adopts a two-stage structure, which can meet the maximum ventilation flow rate of >300Lpm; (3) through the reasonable design of the float and spring, the minimum reopening pressure of the control valve is >35Kpa, and the ventilation volume at the reopening pressure point is >7Lpm, which can be applied to high-pressure fuel tanks with higher pressure and better opening performance; (4) the overall volume is miniaturized, with an overall height of ≤60mm, which can be adapted to the increasingly flat fuel tank assembly; (5) the liquid level closing height of the control valve can reach 10-15mm from the head position of the fuel tank, which can reduce the overall volume of the fuel tank while meeting the rated volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 It is a three-dimensional structural diagram of a fuel tank built-in refueling limit control valve of the utility model.

[0019] Figure 2 It is a side structural diagram of a fuel tank built-in refueling limit control valve of the utility model.

[0020] Figure 3 The utility model is a schematic diagram of the cross-sectional structure of a fuel tank built-in refueling limit control valve.

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the upper shell.

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the upper shell.

[0023] Figure 6 It is a structural diagram of the base.

[0024] Figure 7 It is a structural diagram of the float.

[0025] Figure 8 It is a structural diagram of the first-stage float of FLVV (top surface).

[0026] Figure 9 It is the structural diagram of the first-stage float of FLVV (bottom surface).

[0027] Figure 10 It is a structural diagram of the FLVV second-stage float.

[0028] In the figure: 1. Upper cover, 2. Upper shell, 2.1. First exhaust channel, 2.2. Second exhaust channel, 2.3. Third fixing buckle, 2.4. First chamber, 2.5. Second chamber, 2.6. First through hole, 2.7. First protrusion, 2.8. Second through hole, 2.9. First guide strip, 3. Base, 3.1. Inner sleeve, 3.2. Third chamber, 3.3. Annular slot, 3.4. First fixing buckle, 3.5. Second guide strip Directional bar, 3.6, first U-shaped opening, 3.7, second U-shaped opening, 3.8, reinforcing rib, 4, FLVV first-stage float, 4.1, first installation cavity, 4.2, second installation cavity, 4.3, flower-shaped hole, 4.4, second fixing buckle, 5, FLVV second-stage float, 5.1, rubber pad, 5.2, nylon cylinder, 5.3, second protrusion, 5.4, reinforcing rib, 5.5, third U-shaped opening, 6, spring, 7, noise reduction pad. DETAILED DESCRIPTION

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating the basic structure of the present invention only in a schematic manner. They therefore only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) are intended solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0030] like Figure 1-Figure 3As shown, the utility model is a fuel tank built-in refueling limit control valve, including an upper cover 1, an upper shell 2, a base 3, a float, a spring 6 and a noise reduction pad 7, wherein the base 3 includes an inner sleeve 3.1, the inner sleeve 3.1 is hollow to form a third chamber 3.2, the float is arranged inside the third chamber 3.2 of the inner sleeve 3.1, a spring 6 is provided between the float and the base 3, and the spring 6 can make the float move up and down inside the base 3, the noise reduction pad 7 is arranged on the base 3 of the inner circle of the spring 6, and the top of the noise reduction pad 7 and the bottom of the float can contact each other. As a preferred embodiment, the noise reduction pad 7 can be made of rubber with elastic buffering ability; the upper shell 2 is a hollow cylindrical structure, and the interior is divided into The first chamber 2.4 and the second chamber 2.5 are arranged up and down, and the partition is provided with a first through hole 2.6 connecting the first chamber 2.4 and the second chamber 2.5; the upper shell 2 is covered on the base 3 from top to bottom, and the base 3 and the float cover are arranged inside. The side wall of the first chamber 2.4 is provided with a first exhaust channel 2.1 and a second exhaust channel 2.2 connected thereto. The upper cover 1 covers the top of the first chamber 2.4 of the upper shell 2, and the upper cover 1 and the upper shell 2 are connected by laser welding; the overall height of the control valve is ≤60mm, and the liquid level closing height can reach 10-15mm from the head position of the fuel tank; the float and the spring 6 form the valve core, and the valve core meets the maximum ventilation flow>300Lpm. Figure 1 As shown, the upper shell 2 is further provided with a third fixing buckle 2.3, which cooperates with the metal bracket inside the oil tank to fix the control valve as a whole in the oil tank.

[0031] like Figure 2 、 Figure 4 and Figure 6 As shown, the first snap-fit structure includes a first protrusion 2.7 arranged on the bottom of the upper shell 2, and a first fixing snap-fit 3.4 arranged on the side wall of the annular slot 3.3 of the base 3. During installation, the first protrusion 2.7 is embedded in the first fixing snap-fit 3.4 to connect and fix the upper shell 2 to the base 3.

[0032] like Figure 2 and Figure 5 As shown, the sidewall of the second chamber 2.5 of the upper housing 2 further includes a plurality of second through-holes 2.8, which are arranged circumferentially along the sidewall. In this embodiment, there are four rectangular second through-holes 2.8. These second through-holes 2.8 serve two purposes: one is to provide ventilation, and the other is to allow gasoline to enter the valve chamber (i.e., the second chamber 2.5) through these four holes as the tank liquid level rises during refueling. Once gasoline enters the valve chamber, the buoyancy force causes the float to rise, stopping refueling and enabling control of refueling volume.

[0033] like Figure 5 and Figure 6As shown, the upper shell 2 and base 3 are also provided with a float guide structure. This float guide structure includes a first guide bar 2.9 disposed above the inner wall of the second chamber 2.5 of the upper shell 2, and a second guide bar 3.5 disposed on the inner wall of the inner sleeve 3.1 of the base 3. The first guide bar 2.9 and the second guide bar 3.5 are parallel to the axis, and there are multiple first guide bars 2.9 and second guide bars 3.5 evenly distributed on the inner wall. The first guide bar 2.9 and the second guide bar 3.5 serve to guide and limit the vertical movement of the float, ensuring smooth and stable vertical movement. Furthermore, the first guide bar 2.9 reinforces the upper shell 2, and the second guide bar 3.5 reinforces the inner sleeve 3.1. Furthermore, reinforcing ribs 3.8 are provided on the outer wall of the inner sleeve 3.1.

[0034] like Figure 6 As shown, a first U-shaped opening 3.6 and a second U-shaped opening 3.7 are provided on the side wall of the inner sleeve 3.1 of the base 3, and the first U-shaped opening 3.6 and the second U-shaped opening 3.7 are arranged radially opposite to each other for connecting the second chamber 2.5 and the third chamber 3.2; an annular slot 3.3 is provided on the base 3 at the bottom of the inner sleeve 3.1, and the bottom of the upper shell 2 is inserted into the annular slot 3.3 and is detachably connected by a first snap-fit structure.

[0035] like Figure 7-10 As shown, the float comprises a first-stage FLVV float 4 and a second-stage FLVV float 5. A first mounting cavity 4.1 is defined at the top of the first-stage FLVV float 4. The second-stage FLVV float 5 is disposed within the first mounting cavity 4.1 and is detachably connected via a second snap-fit structure. To facilitate connection and disassembly, the second snap-fit structure includes a second fixing snap 4.4 provided on the sidewall of the first mounting cavity 4.1 and a second protrusion 5.3 provided on the sidewall of the second-stage FLVV float 5. During installation, the second protrusion 5.3 engages within the second fixing snap 4.4. In order to facilitate the installation of the spring 6 and the cooperation with the noise reduction pad 7, a second installation cavity 4.2 and a flower-shaped hole 4.3 are further provided at the bottom of the FLVV first-stage float 4. The second installation cavity 4.2 is used to embed the spring 6; the flower-shaped hole 4.3 is coaxially arranged inside the second installation cavity 4.2 and is petal-shaped as a whole. The bottom of the flower-shaped hole 4.3 can be connected with the noise reduction pad 7, and the top of the noise reduction pad 7 is conical, which can be partially embedded in the flower-shaped hole 4.3 without blocking the flower-shaped hole 4.3, thereby ensuring the flow of internal gasoline.

[0036] like Figure 10As shown, the FLVV second-stage float 5 includes a rubber pad 5.1 and a nylon cylinder 5.2. The rubber pad 5.1 serves as a sealing pad for the first through-hole 2.6, closing the airflow path between the first through-hole 2.6 and the FLVV first-stage float 4 when the liquid level rises. The rubber pad 5.1 is positioned above the nylon cylinder 5.2, and the two are connected by integral vulcanization. A third through-hole is provided at the top of the rubber pad 5.1, connecting to the inner cavity of the nylon cylinder 5.2. The nylon cylinder 5.2 is inserted into the first mounting cavity 4.1. The outer wall of the nylon cylinder 5.2 is also provided with a reinforcing rib 5.4, and the side wall has a third U-shaped opening 5.5 for communication. In this embodiment, there are two third U-shaped openings 5.5, radially symmetrically arranged on the side wall.

[0037] Working principle:

[0038] 1. When the fuel tank level is low, the float is at its lowest position, its bottom in contact with the noise reduction pad, and the FLVV first-stage float 4 is open. With the FLVV first-stage float 4 open, fuel vapor in the tank can be discharged into the charcoal canister through the vent passage in the upper housing 2. During refueling, the fuel tank level continues to rise. When the level reaches the level of the upper housing 2's fuel inlet, gasoline enters the upper housing 2 (i.e., the FLVV valve body). At this point, the FLVV first-stage float 4, due to the buoyancy of the oil and the elastic force of spring 6, overcomes its own gravity and rises. The sealing gasket 5.1 on the FLVV second-stage float 5 forms a seal with the sealing surfaces at the top of the upper housing 2 and the top of the FLVV first-stage float 4, resulting in a seal. The vent passage closes, the tank pressure rises, and the fuel nozzle trips, stopping refueling. At this point, the fuel tank level is the FLVV float's closing height, i.e., the level at the tank's rated capacity.

[0039] 2. Because the sealing area of the FLVV first-stage float 4 is small, the reopening pressure after the FLVV control valve closes is relatively high. When the oil level drops, or the pressure in the tank reaches the reopening pressure, the heavier FLVV first-stage float 4 drops open, allowing air to be exhausted through the small vent in the center of the rubber pad 5.1 on the FLVV second-stage float 5. As the pressure continues to drop, the FLVV second-stage float 5 drops open.

[0040] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the scope of the present invention. The technical scope of this utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A fuel tank built-in refueling limit control valve, characterized by: The control valve comprises an upper cover, an upper shell, a base, a float, a spring, and a noise reduction pad. The base includes an inner sleeve, which is hollow to form a third chamber. The float is disposed within the third chamber of the inner sleeve. A spring is disposed between the float and the base, enabling the float to move up and down within the base. The noise reduction pad is disposed on the base of the inner coil of the spring, with the top of the noise reduction pad and the bottom of the float in contact with each other. The upper shell is a hollow cylindrical structure, and its interior is divided into a first chamber and a second chamber disposed vertically by a partition. The partition is provided with a first through hole connecting the first and second chambers. The upper shell is disposed on the base from top to bottom, housing the base and the float. The sidewalls of the first chamber are provided with first and second exhaust channels communicating therewith. The upper cover covers the top of the first chamber of the upper shell. The overall height of the control valve is ≤60 mm, and the liquid level closing height can reach 10-15 mm from the head of the fuel tank. The float and spring form a valve core, and the valve core meets the maximum ventilation flow rate of >300 Lpm.

2. The fuel tank built-in refueling limit control valve according to claim 1, characterized in that: The float includes an FLVV first-stage float and an FLVV second-stage float. A first installation cavity is provided on the top of the FLVV first-stage float. The FLVV second-stage float is arranged in the first installation cavity and is detachably connected via a second snap-fit structure.

3. The fuel tank built-in refueling limit control valve according to claim 2, characterized in that: The second buckle structure includes a second fixing buckle provided on the side wall of the first installation cavity, and a second protrusion provided on the side wall of the FLVV second-stage float. During installation, the second protrusion is embedded in the second fixing buckle.

4. The fuel tank built-in refueling limit control valve according to claim 2, characterized in that: The bottom of the FLVV first-stage float is also provided with a second installation cavity and a flower-shaped hole. The second installation cavity is used to embed the spring; the flower-shaped hole is coaxially arranged inside the second installation cavity, the bottom of the flower-shaped hole can be connected with the noise reduction pad, and the top of the noise reduction pad is conical, which can be partially embedded in the flower-shaped hole without blocking the flower-shaped hole.

5. The fuel tank built-in refueling limit control valve according to claim 2, characterized in that: The FLVV second-stage float includes a rubber pad and a nylon cylinder. The rubber pad is arranged above the nylon cylinder. A third through hole is provided on the top of the rubber pad, and the third through hole is connected to the inner cavity of the nylon cylinder. The nylon cylinder is inserted into the first installation cavity.

6. The fuel tank built-in refueling limit control valve according to claim 1, characterized in that: The side wall of the second chamber of the upper shell is further provided with a plurality of second through holes, and the second through holes are arranged along the circumferential direction on the side wall.

7. The fuel tank built-in refueling limit control valve according to claim 1, characterized in that: The upper shell and the base are also provided with a float guide structure, which includes a first guide bar arranged above the inner wall of the second chamber of the upper shell, and a second guide bar arranged on the inner wall of the inner sleeve of the base. The first guide bar and the second guide bar are parallel to the axis, and there are multiple first guide bars and second guide bars, which are evenly distributed on the inner wall.

8. The fuel tank built-in refueling limit control valve according to claim 1, characterized in that: A first U-shaped opening and a second U-shaped opening are provided on the side wall of the inner sleeve of the base, and the first U-shaped opening and the second U-shaped opening are arranged radially opposite to each other for connecting the second chamber and the third chamber; an annular slot is provided on the base at the bottom of the inner sleeve, the bottom of the upper shell is inserted into the annular slot, and is detachably connected by a first snap-fit structure.

9. The fuel tank built-in refueling limit control valve according to claim 8, characterized in that: The first buckle structure includes a first protrusion arranged at the bottom of the upper shell, and a first fixing buckle arranged on the side wall of the annular slot of the base. During installation, the first protrusion is embedded in the first fixing buckle to connect and fix the upper shell to the base.

10. The fuel tank built-in refueling limit control valve according to claim 1, characterized in that: The upper shell is also provided with a third fixing buckle, which cooperates with the metal bracket inside the oil tank to fix the control valve as a whole in the oil tank.

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