CN108131482A - A kind of new-type oil tank liquid level control air bleeding valve - Google Patents

Abstract

The invention relates to a novel oil tank liquid level control exhaust valve. The exhaust valve is composed of a flange, an O-ring, a body, a gasket, a first float, a second float, a spring and a bottom cover. A flange is arranged above, a bottom cover is arranged below the body, the O-ring is arranged on the body, the gasket is pressed into the first float, and the first float and the second float form a float assembly , the float assembly is set between the body and the bottom cover; the main function of the valve is to quickly release the fuel vapor inside the fuel tank into the carbon tank during the refueling process of the car, maintain the pressure balance inside and outside the fuel tank, and provide flexibility in the design of the float.

Description

A New Oil Tank Liquid Level Control Exhaust Valve

technical field

The invention relates to an exhaust valve, in particular to a novel fuel tank liquid level control exhaust valve, which belongs to the technical field of fuel tank structural components.

Background technique

During refueling or driving, due to fuel sloshing, liquid fuel beats the float, causing the liquid level control exhaust valve to temporarily close. At this time, if the liquid level control exhaust valve cannot be opened in time to exhaust, the internal pressure of the fuel tank will increase, resulting in There is a risk of expansion and deformation of the fuel tank. Therefore, the liquid level control exhaust valve is required to be able to open the exhaust in time after it is temporarily closed, so as to maintain the pressure required for the normal operation of the fuel tank. This performance of the valve is called re-opening performance. The good re-opening performance of the liquid level control exhaust valve helps the car to maintain the pressure balance inside and outside the fuel tank under severe working conditions, prevent excessive positive or negative pressure inside the fuel tank, and avoid "expansion" or "Depressed". The traditional liquid level control exhaust valve is composed of 8 parts, among which "body", "support", "gasket cover", "float", "bottom cover" are plastic parts, "gasket 1" and "gasket 1" Gasket 2" is a rubber part, "spring" is a metal part, "gasket cover" is used to fix "gasket 2", welded on the "float", "gasket 1" is assembled on the "support", and the rest The relationship between accessories is also an assembly relationship. The traditional liquid level control exhaust valve has the following problems: 1) The structure to realize the re-opening performance is relatively complicated, and there are "gasket 1", "support", "gasket cover", "gasket 2", and "float" in total. Composed of five parts, the cost is relatively high. 2) The traditional liquid level control exhaust valve has a large amount of dynamic liquid fuel leakage, and the valve may close early, and the design flexibility of the float weight is not high; 3) The traditional liquid level control exhaust valve The deficiencies of the gas valve make the structure of "re-opening performance" complex and require welding assembly; 4) the structure for preventing liquid fuel leakage is single. Therefore, there is an urgent need for a new solution to solve this technical problem.

Contents of the invention

The present invention aims at the technical problems existing in the prior art, and provides a new fuel tank liquid level control exhaust valve. The technical solution is ingenious in design and compact in structure. The steam is quickly released into the canister, maintaining pressure balance inside and outside the tank, providing flexibility in float design.

In order to achieve the above object, the technical solution of the present invention is as follows, a novel fuel tank liquid level control exhaust valve, characterized in that the exhaust valve consists of a flange, an O-ring, a body, a gasket, a first float, a second Two floats, a spring and a bottom cover are formed, a flange is arranged above the body, a bottom cover is arranged below the body, the O-ring is arranged on the body, the gasket is pressed into the first float, The first float and the second float form a float assembly, and the float assembly is arranged between the body and the bottom cover.

As an improvement of the present invention, the flange is provided with a flange assembly hole, the upper side of the body is provided with a body assembly protrusion 1, and the lower side of the body is provided with a body assembly protrusion 2, the The bottom cover is provided with a bottom cover assembly hole. When assembling, the flange assembly hole is pressed into the assembly protrusion on the body, and the flange is firmly assembled on the body, so that the four assembly holes on the bottom cover are pressed. Press firmly into the assembly protrusion on the main body two miles, and assemble the bottom cover firmly on the main body. Through the structure of the assembly hole and the assembly protrusion, the stability of the assembly of the parts is ensured, and the risk of mutual detachment is avoided

As an improvement of the present invention, the first float is provided with a first float assembly hole and a gap in the first float assembly hole. The cylindrical surface between the two surfaces, a boss is provided between the cylindrical surface and the lower sealing surface, and a ventilation hole is provided on the upper sealing surface, and the sealing gasket is pressed in from the gap of the first float assembly hole using the elastic deformation of the rubber. In the assembling hole of the first float, the sealing pad recovers elastic deformation after being pressed into the assembling hole of the first float. The gasket is a rubber part, and the float is a plastic part. Since the diameters of the outer rings of the upper sealing surface and the lower sealing surface of the gasket are larger than the diameter of the float assembly hole, the gasket and float 1 will not separate from each other after assembly. Move up and down a certain distance.

As an improvement of the present invention, the notch feature of the assembly hole designed on the upper part of the float facilitates the sealing gasket to be pressed into the assembly hole of the float when assembling. The distance between the notches of the first float assembly hole is smaller than the diameter of the cylindrical surface of the gasket, and the diameter of the first float assembly hole is slightly larger than the diameter of the middle cylinder of the gasket. The gasket boss feature is designed on the top of the sealing surface under the gasket. This feature is used for when the valve is reopened, the gravity can effectively act on the gasket during the floater's descent, and it is convenient for the gasket to achieve large flow of exhaust.

As an improvement of the present invention, the body is provided with a body window, and the inner surface opposite to the upper window of the body is provided with an annular rib, and the arc of the annular rib is larger than that of the body window. This structure can ensure that the float can float up smoothly with the rise of the fuel level during the refueling process, preventing the liquid fuel from directly hitting the float through the window on the body during refueling, causing the float to float up and causing the valve to close in advance.

As an improvement of the present invention, the flange is provided with a flange vent and a flange rib, and a flange rib is provided between the body vent 35 and the flange vent, and upwards around the body vent. , and the oil return gap of the body is set on the side opposite to the flange vent. The liquid fuel that sloshes from the air port of the body to the flange cavity can flow back into the valve through the rib plate of the flange and the oil return gap structure of the body, thereby reducing the dynamic leakage of the valve.

As an improvement of the present invention, the first float is provided with an assembly hole, and the second float is provided with buckles and protrusions. The assembly holes are matched, and the first float and the second float are assembled into a float assembly. After the assembly, the protrusion on the first float just abuts on the first float, and the first float and the second float are fastened together. By adjusting the weight of the float 2, the float assembly can have different weights, and then valves with different closing heights can be designed.

As an improvement of the present invention, the body is provided with a body annular groove, and the flange is also provided with a flange boss and a flange annular edge. The ring edge of the flange makes the O-ring compress and deform between the annular groove of the body and the annular edge of the flange. In order to prevent the O-ring from falling off the annular groove of the body, a boss structure is set above the annular edge of the flange. At the same time, the annular groove of the body and the flange The width of the reserved gap after the flange ring edge is assembled is about three-quarters of the diameter of the O-ring, which can ensure the effective compression of the O-ring, thereby ensuring the effectiveness of the seal.

Compared with the prior art, the present invention has the following advantages: 1) The overall structural design of the technical solution is compact and ingenious, the solution realizes a relatively simple re-opening structure, the cost is low, the assembly is simple, and a structure to prevent the valve from closing in advance is designed; 2) This scheme designs a variety of structures to prevent liquid fuel leakage; 3) The counterweight design of the float in this scheme increases the flexibility of the float weight design; 4) The fuel filling volume can be precisely controlled through the valve; During normal driving or parking, the valve can prevent liquid fuel from sloshing into the carbon tank, avoiding oversaturation, blockage and failure of the carbon tank; Liquid fuel to prevent fuel leakage; "liquid level control exhaust valve" will be widely used in automotive fuel systems that meet the "National Six" emission regulations.

Description of drawings

Fig. 1 is the exploded schematic view of overall structure of the present invention;

Fig. 2 is a sectional view of the present invention;

Figure 3 is a schematic diagram of the assembly of the flange, the body and the bottom cover;

Figure 4 is a schematic diagram of the assembly of the float and the gasket;

Fig. 5 is a schematic diagram of the float structure;

Fig. 6 is a schematic diagram of the gasket structure;

Fig. 7 is a schematic diagram of the float counterweight structure;

Fig. 8 is a schematic diagram of an O-ring sealing structure;

Fig. 9 is a schematic diagram of a structure for preventing leakage of liquid fuel;

Fig. 10 is a structural schematic diagram for preventing the valve from closing in advance;

Figure 11 is a schematic diagram of the valve;

Figure 12 is a schematic structural diagram of the liquid level control exhaust valve;

Fig. 13 is a schematic diagram of the second exhaust state.

In the figure: 1. Flange, 2. O-ring, 3. Body, 4. Gasket, 51. First float, 52. Second float, 6. Spring, 7. Bottom cover, 11. Flange assembly hole . 34. Body rib plate, 35. Body air vent, 36. Body oil return gap, 37. Body annular groove, 71. Bottom cover assembly hole, 511. First float assembly hole, 512 First float assembly hole gap, 521, The second float buckle, 522, the second float protrusion, 41, the upper sealing surface, 42, the lower sealing surface, 43, the cylindrical surface, 44, the boss, 45, the vent hole.

Detailed ways:

In order to deepen the understanding of the present invention, the present embodiment will be described in detail below in conjunction with the accompanying drawings.

Embodiment 1: Referring to Fig. 1 and Fig. 2, a new oil tank liquid level control exhaust valve, the exhaust valve consists of a flange 1, an O-ring 2, a body 3, a gasket 4, a first float 51, a second Two floats 52, a spring 6 and a bottom cover 7 are formed. A flange is arranged above the body, a bottom cover is arranged below the body, the O-ring is arranged on the body, and the gasket is pressed into the first On the float, the first float and the second float form a float assembly, and the float assembly is arranged between the body and the bottom cover. The liquid level control exhaust valve assembly is composed of 8 sub-parts. Among them, "flange", "body", "first float", "second float" and "bottom cover" are plastic parts, "O-ring" and "gasket" are rubber parts, and "spring" is metal parts , see Figure 3, the flange is provided with a flange assembly hole 11, the upper side of the body is provided with a body assembly protrusion 1 31, and the lower side of the body is provided with a body assembly protrusion 2 32, the The bottom cover is provided with a bottom cover assembly hole 71. When assembling, the flange assembly hole is forced into the assembly protrusion 131 on the body, and the flange is firmly assembled on the body, so that the four assemblies on the bottom cover The hole is pressed into the assembly protrusion on the body for two miles, and the bottom cover is firmly assembled on the body. Through the structure of the assembly hole and the assembly protrusion, the stability of the assembly of the components is ensured, and the risk of separation from each other is avoided.

Embodiment 2: Referring to Fig. 4-Fig. 6, as an improvement of the present invention, the first float is provided with a first float assembly hole 511 and a first float assembly hole notch 512, and the gasket includes an upper sealing surface 41. The lower sealing surface 42 and the cylindrical surface 43 arranged between the upper sealing surface and the lower sealing surface, a boss 44 is arranged between the cylindrical surface and the lower sealing surface, and a ventilation hole 45 is arranged on the upper sealing surface , the gasket is pressed into the assembly hole of the first float from the notch of the assembly hole of the first float by elastic deformation of the rubber, and the elastic deformation of the gasket is restored after being pressed into the assembly hole of the first float. The gasket is a rubber part, and the first float is a plastic part. Since the diameters of the outer rings of the upper sealing surface and the lower sealing surface of the gasket are larger than the diameter of the first float assembly hole, the gasket and the first float will not separate from each other after assembly. It can move a certain distance up and down in the assembly hole of the float 1. The notch feature of the assembly hole designed on the upper part of the first float is convenient for the gasket to be pressed into the assembly hole of the first float during assembly. The distance between the notch of the first float assembly hole is smaller than the diameter of the cylindrical surface of the gasket, and the diameter of the first float assembly hole is slightly larger than the diameter of the middle cylinder of the gasket. The gasket boss feature is designed on the top of the sealing surface under the gasket. This feature is used for when the valve is reopened, the gravity can effectively act on the gasket when the float 1 descends, and it is convenient for the gasket to realize large flow exhaust.

Embodiment 3: Referring to Figures 9 and 10, as an improvement of the present invention, the body is provided with a body window 33, and the inner surface opposite to the window on the body is provided with an annular rib 34, the annular rib The radian of is larger than that of the body window. This structure can ensure that the float can float up smoothly with the rise of the fuel level during the refueling process, preventing the liquid fuel from directly hitting the float through the window on the body during refueling, causing the float to float up and causing the valve to close in advance. A flange vent 12 and a flange rib 13 are arranged on the flange, and a flange rib 13 is arranged between the body vent 35 and the flange vent 12, upwards around the body vent, and ventilated with the flange The body oil return gap 36 is set on the side opposite to the port. The liquid fuel that sloshes from the air port of the body to the flange cavity can flow back into the valve through the rib plate of the flange and the oil return gap structure of the body, thereby reducing the dynamic leakage of the valve. The schematic diagram of the structure to prevent liquid fuel leakage is shown below.

Embodiment 4: Referring to FIG. 7, as an improvement of the present invention, the first float 51 is provided with an assembly hole 511, and the second float is provided with buckles 521 and protrusions 522. The buckle on the second float matches the assembly hole on the first float, and the first float and the second float are assembled into a float assembly. After the assembly, the protrusion on the first float is just on the first float. The float and the second float are fastened together. By adjusting the weight of the float 2, the float assembly can have different weights, and then valves with different closing heights can be designed.

Embodiment 5: Referring to Fig. 8, as an improvement of the present invention, the body is provided with a body annular groove 37, and the flange is also provided with a flange boss and a flange ring edge, and the O-ring is assembled on the In the annular groove 37 of the body, the O-ring is compressed and deformed between the annular groove of the body and the annular edge of the flange by pressing into the annular edge of the flange. In order to prevent the O-ring from falling off from the annular groove of the body, a Boss structure. At the same time, the width of the reserved gap between the body annular groove and the flange annular edge is about three quarters of the diameter of the O-ring, which can ensure the effective compression of the O-ring, thereby ensuring the effectiveness of the seal.

work process:

See Figure 11. During refueling or driving, due to fuel sloshing, the liquid fuel beats the float, causing the liquid level control exhaust valve to temporarily close. At this time, if the liquid level control exhaust valve cannot be opened in time to exhaust, the internal pressure of the fuel tank will There is a risk of expansion and deformation of the fuel tank. Therefore, the liquid level control exhaust valve is required to be able to open the exhaust in time after it is temporarily closed, so as to maintain the pressure required for the normal operation of the fuel tank. The schematic diagram of the valve closing is shown in Figure 11.

After the liquid level control exhaust valve is closed, although the internal pressure of the fuel tank is relatively high, because the vent hole in the middle of the gasket is relatively small in diameter, the float opens the first stage of exhaust under the action of gravity. As shown in the first stage exhaust schematic diagram 12,

The first-stage exhaust of the liquid level control exhaust valve releases part of the pressure of the fuel tank, further reducing the internal pressure of the fuel tank, and at this time the weight of the float acts on the gasket. The gravity of the gasket itself and the gravity of the float acting on it are greater than the upward pressure generated by the pressure difference and the upward elastic force of the compression spring, the sealing surface of the gasket is separated from the valve body, and the valve opens the second stage to exhaust. The valve can balance the internal and external pressure of the fuel tank through two-stage exhaust. The schematic diagram of the second-stage exhaust is shown in Figure 13. The design of the liquid level control exhaust valve realizes the two-stage opening of the valve through a gasket structure, which simplifies the re-opening structure of the valve. At the same time, the design scheme uses the gasket and The assembleable design of the float reduces the process cost.

The present invention can also combine at least one of the technical features described in Examples 2, 3, 4, and 5 with Example 1 to form a new implementation.

It should be noted that the above-mentioned embodiments are not used to limit the protection scope of the present invention, and equivalent transformations or substitutions made on the basis of the above-mentioned technical solutions all fall within the protection scope of the claims of the present invention.

Claims (8)

1. a kind of new-type oil tank liquid level control air bleeding valve, which is characterized in that the air bleeding valve is by flange, 0 type circle, ontology, sealing Pad, the first float, the second float, spring and bottom cover form, and flange, the lower section of the ontology are provided with above the ontology Bottom cover is provided with, the O-ring is arranged on ontology, and the gasket is pressed on the first float, first float and second Float forms float assembly, between float assembly setting ontology and bottom cover.

2. new-type oil tank liquid level control air bleeding valve according to claim 1, which is characterized in that be provided with method on the flange Blue pilot hole is provided with ontology assembling protrusion one on the upside of the ontology, ontology assembling protrusion is provided on the downside of the ontology Two, it is provided with bottom cover pilot hole on the bottom cover, during assembling, in the assembling protrusion one on flange pilot hole stress press-in ontology, Flange is fitted securely on ontology, four pilot hole stress on bottom cover is made to be pressed into the assembling protrusion two on ontology, it will Bottom cover is fitted securely on ontology.

3. new-type oil tank liquid level control air bleeding valve according to claim 2, which is characterized in that set on first float There are the first float pilot hole and the first float pilot hole notch, the gasket includes upper sealing surface, lower sealing surface and setting Cylindrical surface between upper sealing surface and lower sealing surface is provided with boss between the cylindrical surface and lower sealing surface, described close Ventilation hole is provided on cover, gasket is pressed into the first float from the first float pilot hole indentation, there using the flexible deformation of rubber Pilot hole, gasket be pressed into the first float pilot hole after restore flexible deformation.

4. new-type oil tank liquid level control air bleeding valve according to claim 3, which is characterized in that the first float pilot hole The distance of notch is less than gasket cylindrical surface diameter, and the first float assembling bore dia is slightly larger than body diameter in the middle part of gasket.

5. new-type oil tank liquid level control air bleeding valve according to claim 4, which is characterized in that this is provided on the ontology Body window, the inner surface opposite with window on ontology are provided with cyclic annular floor, and the radian of the ring-type floor is more than ontology window Radian.

6. new-type oil tank liquid level control air bleeding valve according to claim 5, which is characterized in that be provided with method on the flange Blue blow vent, flange floor set flange floor, around ontology blow vent between the ontology blow vent and flange blow vent Upwards, and on the side opposite with flange blow vent ontology oil return notch 36 is set.

7. new-type oil tank liquid level control air bleeding valve according to claim 6, which is characterized in that set on first float There is pilot hole, be provided with buckle and protrusion on second float, it is described by by the buckle on the second float and the first float On pilot hole cooperation, the first float and the second float are assembled into float assembly, the protrusion after assembling on the first float Just it withstands on the first float, the first float and the second float tighten together.

8. the new-type oil tank liquid level control air bleeding valve according to claim 5 or 6 or 7, which is characterized in that set on the ontology Ontology annular groove is equipped with, flange boss and flange annular edge are additionally provided on the flange, O-ring is assemblied in ontology annular groove In, by being pressed into flange annular edge, make O-ring compressive deformation between ontology annular groove and flange annular edge, it is O-shaped in order to prevent Circle comes off from ontology annular groove, and boss structure is set above flange annular edge.