Oil gun gas-collecting hood and oil gun

Abstract

The utility model discloses a gas-collecting hood of an oil gun, and further discloses the oil gun which comprises the gas-collecting hood of the oil gun. The objective of the utility model is to solve the problem that a secondary oil gas recovery system cannot be compatible with ORVR in the prior art. The action diaphragm is installed in the oil gun gas-collecting hood, and the gas compensation hole and the breathing hole are formed in the oil gun gas-collecting hood, so that when vehicles with different oil tanks are refueled, the amount of gas absorbed by the secondary oil gas recovery system is different. When the oil gun refuels a vehicle without ORVR, the secondary oil gas recovery system normally absorbs oil gas; when the oil gun refuels a vehicle with ORVR, the sealing surface and the oil tank are completely attached to form a closed space, and negative pressure is formed in the oil gas recovery channel, so that the action diaphragm is tensioned, the diameter of the oil gas recovery channel is reduced, only a small amount of air is recovered into the oil tank, and the effect of reducing oil gas evaporation while the vacuum pump is compensated is achieved. The method can be compatible with ORVR vehicles and non-ORVR vehicles, replacement and upgrading of new and old oil guns are facilitated, gas station equipment is protected at extremely low cost, energy is saved, and the environment is protected.

Description

Technical Field

[0001] This utility model relates to the field of refueling equipment technology, specifically to a fuel nozzle gas collection cover. Background Technology

[0002] Gasoline is a light petroleum product that is highly volatile at room temperature. This volatility is one of the key factors for its use as a fuel, but it also brings some problems. For example, when refueling a car at a gas station, the evaporating gasoline not only wastes energy, but the volatile substances also pollute the atmosphere. Early solutions to this problem involved using secondary vapor recovery systems at gas stations. These systems use vacuum pumps to collect the vapors evaporated during refueling through a hood, fuel nozzle, and pipelines, ultimately transporting them to underground storage tanks for recycling.

[0003] However, in recent years, according to the Type VII test requirements of GB 18352.6-2016, vehicles are required to be equipped with an on-board refueling vapor recovery system (ORVR), which collects and recovers fuel vapor through a carbon canister. Because the fuel tank is liquid-sealed at the tank opening during refueling, and the vapor collection hood of a typical secondary vapor recovery nozzle cannot seal with the ORVR's tank, the vacuum pump draws a large amount of air into the fuel tank. This is not only uneconomical but also increases evaporation within the fuel tank, resulting in significant waste.

[0004] The inventors have disclosed a fuel nozzle and a fuel nozzle venting cover (patent document number CN118289697A), comprising a housing and a vapor recovery balance valve. The housing of the fuel nozzle venting cover has two openings, the smaller one used for connection to the fuel nozzle and referred to as the first opening. The vapor recovery balance valve is located near the first opening on the housing. The balance valve consists of a valve seat, a valve core, and a connecting sleeve. Through holes are distributed on the valve seat, allowing fuel vapor to enter the connecting sleeve. The valve core is movable within the connecting sleeve, existing in two states: a first position and a second position. When refueling an ORVR vehicle, the fuel vapor in the tank cannot be removed by the vapor recovery system, creating a vacuum that causes the valve core to move to the second position. At this position, external gas can enter the fuel vapor passage through a specific channel on the valve core, preventing excessive load on the vacuum pump. When refueling a non-ORVR vehicle, the valve core is in the first position, allowing fuel vapor to normally enter the connecting sleeve through the valve seat, achieving normal vapor recovery and thus ensuring compatibility with refueling processes for different vehicles.

[0005] However, in the process of implementing the technical solutions in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems:

[0006] First, the complex structure of the fuel nozzle and its vent cover not only increases costs but also leads to a higher probability of malfunction. Second, this technical solution causes the secondary vapor recovery system to recycle a large amount of air, which does not conform to the environmental protection and energy conservation principles of national standard GB20952-2020 and local standard DB11 208-2023. This will cause the pressure inside the fuel tank to rise rapidly, gasoline to evaporate more quickly and be released into the atmosphere through the breather valve, easily leading to resource waste and environmental pollution, and increasing safety hazards. In addition, this invention does not provide specific technical solutions for adapting to different fuel nozzles.

[0007] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] In view of at least one of the above technical problems, this disclosure provides a fuel nozzle gas collection cover, which automatically controls the movement of an actuated diaphragm installed inside the gas collection cover by air pressure, thereby controlling the absorption of gas by the secondary fuel vapor recovery system when refueling different vehicles.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] Design a gas collection hood for an oil gun, including an oil-gas sealing hood and an oil tank sealing hood connected to the oil-gas sealing hood. A gas compensation hole is provided on the intake side of the oil-gas sealing hood, and a breather hole is provided in the middle section of the oil-gas sealing hood. An actuating diaphragm covering the breather hole is connected to the inner side of the middle section of the oil-gas sealing hood. The actuating diaphragm divides the interior of the oil-gas sealing hood into an atmospheric pressure chamber connected to the breather hole and an oil-gas recovery chamber connected to the gas compensation hole. The size of the oil-gas recovery chamber changes under the action of the actuating diaphragm.

[0011] Furthermore, the oil and gas sealing cover has a groove on the side near the oil gun base, and the groove is connected to the oil gun base by a clamp.

[0012] Furthermore, the oil and gas sealing cover and the oil tank sealing cover are supported and connected by two layers of rings, and are fixed and sealed by fastening rings.

[0013] Furthermore, the diameter of the gas compensation hole is 2-3 mm.

[0014] Furthermore, the actuating diaphragm is arranged circumferentially along the oil and gas sealing cover.

[0015] Furthermore, the oil and gas sealing cover and the actuating diaphragm are bonded together by adhesive, crosslinking agent or thermoplastic treatment.

[0016] Furthermore, the actuating diaphragm deforms when the pressure difference between the oil and gas recovery chamber and the atmospheric pressure chamber reaches 100 Pa.

[0017] Furthermore, an oil gun is designed, comprising an oil gun gas collection hood as described in any of the above.

[0018] One or more technical solutions provided in the embodiments of this application have at least one of the following technical effects or advantages:

[0019] 1. By utilizing the fuel tank sealing cover to adapt to different fuel tanks and the gas compensation hole, the problem that the fuel nozzle cannot be adapted to both vehicles with and without ORVR in the existing technology is effectively solved, and the problem of excessive load on the secondary vapor recovery system when refueling vehicles with ORVR is avoided. Thus, automatic compatibility with different vehicles is achieved during refueling, and the gas station facilities are protected.

[0020] 2. By utilizing the air pressure difference on both sides of the diaphragm to drive the diaphragm, the problem of the secondary oil vapor recovery system absorbing a large amount of air when refueling a car with ORVR and the complexity of the balance valve structure in the existing technology are effectively solved. This reduces oil vapor evaporation in the oil tank, lowers manufacturing costs, and protects the environment while reducing resource waste.

[0021] 3. By adopting the same connection method between the gas collection hood and the oil gun base as existing technologies, the problem that the gas collection hood cannot be adapted to the oil and gas recovery oil gun in existing technologies is effectively solved. This achieves the effect of directly modifying existing oil and gas recovery oil guns, reducing costs and improving replacement efficiency.

[0022] 4. The diaphragm is made of a temperature-insensitive plastic material, which effectively solves the problem that the performance of the device changes with temperature in the existing technology, thereby improving the stability and reliability of the device and significantly extending its service life. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an oil gun according to an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the gas collection hood structure according to an embodiment of this application.

[0025] In the above figures, 1 is the oil gun base; 2 is the gas collection hood; 21 is the oil tank sealing cover; 22 is the oil-gas sealing cover; 221 is the concave front eave; 222 is the bellows telescopic sleeve; 223 is the concave rear eave; 224 is the actuating diaphragm; 225 is the gas compensation port; 226 is the breather port; 227 is the atmospheric pressure chamber; 228 is the oil-gas recovery chamber; 23 is the front ring frame; 24 is the rear ring frame; 25 is the fastening ring; 26 is the clamp; 3 is the oil gun barrel; and 31 is the barrel clip. Detailed Implementation

[0026] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "vertical," "horizontal," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first," "second," etc., used in this application are used to distinguish the described objects and do not have any sequential or technical meaning. And the terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages).

[0027] Unless otherwise specified, the unit modules (components, structures, mechanisms) or sensors involved in the following embodiments are all conventional commercially available products.

[0028] This application provides a fuel nozzle vent cover, which solves the problems of incompatibility between secondary fuel vapor recovery and ORVR in the prior art, as well as the problem of secondary fuel vapor recovery systems drawing in large amounts of air. It employs a fuel tank sealing cover and opens a gas compensation hole at the front end of the sealing cover, allowing a composite diaphragm inside the sealing cover to control the amount of gas drawn in by the secondary fuel vapor recovery system, thus achieving adaptability to different vehicles.

[0029] The technical solution in this application is to solve the above problems, and the overall approach is as follows:

[0030] By installing an actuating diaphragm inside the fuel nozzle's venting cover and creating gas compensation and vent holes on the cover, the amount of gas passing through the fuel nozzle varies depending on the fuel tank. When refueling a vehicle without ORVR (Oriented Vapor Recovery System), the secondary vapor recovery system absorbs fuel vapor normally. When refueling a vehicle with ORVR, the fuel tank and venting cover are completely sealed, creating a negative pressure within the sealed space. This causes the actuating diaphragm to move towards the fuel line, narrowing the vapor recovery chamber and allowing only a small amount of air to be recovered into the fuel tank. This achieves the effect of reducing fuel vapor evaporation while compensating for the vacuum pump.

[0031] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] This example discloses a gas collection hood for an oil gun. See [link / reference] Figure 1-2Specifically, it includes an oil-gas sealing cover 22 made of polyurethane. The oil-gas sealing cover 22 is an eccentric cone shape, and from the diffuser end to the convergent end, it consists of a concave front rim 221, a bellows telescopic sleeve 222, and a concave rear rim 223. There is a groove on the inner side of the connection between the concave front rim 221 and the bellows telescopic sleeve 222, in which the rear ring frame 24 is installed. The rear ring frame 24 is made of rigid material, so the concave front rim 221 is supported and shaped by the rear ring frame 24. The front end of the rear ring frame 24 is fastened to the front ring frame 23 by bolts. The front ring frame 23 is also made of rigid material, and its hook-shaped structure fits perfectly into the interior of the fuel tank sealing cover 21. The fuel tank sealing cover 21 is also made of polyurethane, and its opening that contacts the fuel tank is a fitted curved surface designed according to the external parameters of the ORVR standard fuel tank. Fluid sealing is achieved through the contact between the fitted curved surface and the fuel tank opening. The groove on the concave front rim 221 presses against the extended side of the fuel tank sealing cover 21, and the concave front rim 221 and the extended side of the fuel tank sealing cover 21 are pressed onto the front ring frame 23 by the fastening ring 25.

[0034] A gas compensation hole 225 with a diameter of 3 mm is opened on the side of the bellows telescopic sleeve 222 near the concave front edge 221, and a breather hole 226 is opened on the bellows telescopic sleeve 222. Inside the bellows telescopic sleeve 222 of the oil-gas sealing cover 22, an actuating diaphragm 224 is bonded with adhesive. The actuating diaphragm 224 is an annular film made of polyimide, which is elastic and insensitive to temperature. The actuating diaphragm 224 surrounds the inside of the bellows telescopic sleeve 222, dividing the oil-gas sealing cover 22 into two cavities: an oil-gas recovery cavity 228 connected to the gas compensation hole 225 and an atmospheric pressure cavity 227 connected to the breather hole 226. When there is a pressure difference between the atmospheric pressure cavity 227 and the oil-gas recovery cavity 228, the actuating diaphragm 224 undergoes elastic deformation to change the gap between itself and the oil gun barrel 3, thereby changing the amount of gas drawn in for secondary oil-gas recovery. The converging end of the oil and gas sealing cover 22 is a concave rear eave 223, which can be fastened into the groove at the front end of the oil gun base 1 of various models, and the gas collection cover 2 and the oil gun base 1 are tightly fastened together by the fastening band 26.

[0035] There are two situations during work:

[0036] 1. When refueling a vehicle without ORVR, the fuel nozzle 3 is inserted into the fuel tank opening. Since the fuel tank seal 21 is designed according to the standard ORVR fuel tank opening size, and the ORVR fuel tank opening size differs from that of vehicles without ORVR, the seal 21 cannot completely seal the fuel tank opening of vehicles without ORVR. Therefore, fuel vapors will overflow from the fuel tank opening as fuel is injected. At this time, the secondary vapor recovery system, through the operation of the vacuum pump, creates negative pressure at the air inlet of the vapor recovery chamber 228, i.e., the fuel tank seal 21, drawing in the overflowing fuel vapors. Because a large amount of gas is drawn in, there is no negative pressure on the side wall of the vapor recovery chamber 228. Therefore, the diaphragm 224 will not move, and the size of the vapor recovery chamber 228 remains unchanged. The vapor will enter the vapor recovery pipeline along the gas collection hood 2 and eventually enter the oil tank of the gas station, so that the vapor recovery ratio is controlled at a gas-liquid ratio of 1:1 to 1:1.2 to ensure that refueling and vapor recovery are carried out simultaneously and to reduce the escape.

[0037] When refueling is complete, the secondary oil and gas recovery system is shut off.

[0038] 2. When refueling a vehicle equipped with ORVR, align the fuel nozzle with the vehicle's fuel tank opening and press firmly. This causes the bellows telescopic sleeve 222 of the vent shroud 2 to contract, shortening the length of the vent shroud 2 and exposing the nozzle barrel clip 31. The ORVR fuel tank opening has a built-in retaining ring. By engaging the nozzle barrel clip 31 with the retaining ring, the nozzle barrel 3 is tightly connected to the fuel tank opening. Because the ORVR fuel tank opening also has a built-in liquid seal, fuel vapors cannot escape through the fuel tank opening and can only be recovered through the ORVR's carbon canister. Therefore, when refueling a vehicle equipped with ORVR, no gas escapes from the fuel tank opening.

[0039] Since the fuel tank sealing cover 21 is designed according to the size of the ORVR standard fuel tank opening, it can fit tightly against the fuel tank opening. When gasoline is added to the vehicle, the secondary vapor recovery system activates simultaneously. Because the air inlet of the vapor recovery chamber 228, i.e., the fuel tank sealing cover 21, is sealed to the fuel tank opening, and there is no gas at the fuel tank opening for the secondary vapor recovery system to draw in, a negative pressure is created in the vapor recovery chamber 228. Under the action of this negative pressure, air is forced into the vapor recovery chamber 228 through the gas compensation hole 225. However, the diameter of the gas compensation hole 225 is only 3mm, so the amount of air drawn in is limited. At this time, the atmospheric pressure chamber 227 formed by the actuating diaphragm 224 and the bellows telescopic sleeve 222 is connected to the atmosphere through the breather hole 226. Therefore, the pressure of the atmospheric pressure chamber 227 on the actuating diaphragm 224 is the same as the atmospheric pressure. The pressure in the vapor recovery chamber 228 on the other side of the actuating diaphragm 224 is very small. When the pressure difference between the two sides is greater than the deformation pressure of the actuating diaphragm 224 (100 Pa), the actuating diaphragm 224 will be pushed towards the fuel nozzle 3 and tensioned. At this time, the gap between the actuating diaphragm 224 and the fuel nozzle 3 is maintained at 0.1-0.4 mm and in dynamic equilibrium. The amount of gas that can pass through the vapor recovery chamber 228 is reduced, resulting in a small amount of air entering the fuel tank of the gas station through the secondary vapor recovery system, but this is sufficient to compensate for the vacuum pump and other components of the secondary vapor recovery system, thus reducing the damage to them. Because a small amount of air enters the gas station's tanks through the secondary vapor recovery system, the amount of vapor evaporation in the tanks does not change significantly, and the components of the secondary vapor recovery system are protected.

[0040] When refueling is complete, lift the fuel nozzle to separate the nozzle clip 31 from the retaining ring, pull out the fuel nozzle barrel 3 from the fuel tank opening, and the bellows telescopic sleeve 222 returns to its initial length. At the same time, the secondary oil and gas recovery system is closed, and the oil and gas recovery chamber 228 returns to normal air pressure. At this time, the air pressure in the oil and gas recovery chambers 228 on both sides of the actuating diaphragm 224 is equal to that in the atmospheric pressure chamber 227. The actuating diaphragm 224 is no longer under pressure and no longer produces elastic deformation, returning to its initial state.

[0041] In summary, this device is adaptable to different fuel tanks and uses pressure difference to control the deformation of the diaphragm, thereby changing the intake volume of the secondary vapor recovery system. This avoids excessive load on the secondary vapor recovery system when refueling vehicles equipped with ORVR (Organic Vapor Recycling System), while reducing fuel vapor evaporation within the tank, protecting the environment and conserving resources. Because this vapor collection hood has a simple structure, low manufacturing cost, and is compatible with various existing fuel nozzle models, it reduces enterprise costs and improves replacement efficiency.

[0042] Although some preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0043] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from the spirit and scope of its inventive concept. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this application and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An oil gun gas cup comprising an oil and gas tight cup, characterized in that: The oil tank sealing cover is connected with the oil and gas sealing cover, a gas compensation hole is arranged on the air suction side of the oil and gas sealing cover, a breathing hole is arranged in the middle section of the oil and gas sealing cover, and a movable diaphragm covering the breathing hole is connected to the inner side of the middle section of the oil and gas sealing cover.

2. The air cap of claim 1, wherein The oil and gas sealing cover is provided with a groove close to the side of the oil gun base, and the groove is connected with the oil gun base through a clamp.

3. The air cap of claim 1 wherein, The oil and gas sealing cover and the oil tank sealing cover are supported and connected through two layers of ring frames in front and back, and are fixed and sealed through fastening rings.

4. The air cap of claim 1 wherein, The diameter of the gas compensation hole is 2-3 mm.

5. The air cap of claim 1 wherein, The movable diaphragm is arranged along the circumference of the oil and gas sealing cover.

6. The air cap of claim 1 wherein, The oil and gas sealing cover and the movable diaphragm are bonded through an adhesive, a cross-linking agent or a thermoplastic treatment.

7. The air cap of claim 1 wherein, The movable diaphragm is deformed when the pressure difference between the oil gas recovery cavity and the normal pressure cavity reaches 100 Pa.

8. An oil gun characterized by: An oil gun gas collecting cover containing the oil gun gas collecting cover of any one of claims 1-7.

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