Orvr sensing device

Abstract

The application discloses an ORVR sensing device, aiming at solving the technical problem that the service life of a secondary oil vapor recovery system is reduced due to excessive negative pressure of a vacuum pump caused by blocking an oil vapor recovery channel of an existing oil vapor recovery fuel gun. The technical scheme of the application forms a cavity through an elastic sealing assembly and a shell, and controls the opening and closing of a first channel by using the pressure difference between the atmosphere and the cavity, so that fresh air is prevented from being sucked in when the oil vapor recovery fuel gun is used to refuel a vehicle with a vehicle-mounted ORVR system, and thus the secondary oil vapor recovery system is prevented from discharging an equal volume of oil vapor to pollute the environment. Meanwhile, an auxiliary air passage is designed in parallel with the first channel, and since the diameter of the auxiliary passage is too small, when the first channel is opened, no substantial impact is caused, and when the first channel is sealed, the auxiliary passage flows small-flow gas to meet the normal operation of the vacuum pump of the secondary recovery system.

Description

Technical Field

[0001] This application relates to the field of fuel dispenser equipment technology, specifically to an ORVR sensing device. Background Technology

[0002] A secondary vapor recovery system (ORVR) refers to an environmentally friendly process at gas stations where, while fuel is being dispensed into a vehicle's tank using a vapor recovery nozzle, the vapors displaced by the fuel are simultaneously drawn back into an underground storage tank via vacuum suction. This direct volume exchange of fuel and vapors creates an environmentally friendly environment. Current China VI emission standard vehicles are generally equipped with onboard ORVR systems, whose built-in carbon canisters actively absorb vapors evaporating from the fuel tank, significantly reducing the vapor-to-liquid ratio during refueling. When refueling an ORVR vehicle using a standard secondary vapor recovery nozzle equipped with a secondary vapor recovery system, the vapor-to-liquid ratio in the fuel tank is lower due to the ORVR effect than with a standard vapor recovery nozzle. This creates negative pressure, causing the vapor recovery nozzle to draw a large amount of fresh air into the underground fuel tank through the vapor recovery channel. This forces a medium volume of vapors in the underground tank to be displaced and released into the atmosphere, causing more severe pollution. Therefore, standard secondary vapor recovery systems are incompatible with ORVR vehicles. To ensure compatibility with both ORVR and secondary vapor recovery systems, existing technology integrates an ORVR sensor component into the vapor recovery channel of the fuel dispenser. When refueling an ORVR vehicle and creating a specific negative pressure, the pressure difference across the diaphragm of the sensor component drives the diaphragm to move, thereby actively blocking the vapor recovery channel, suspending the vacuum extraction function of the secondary vapor recovery system, and allowing the vehicle's own ORVR system to complete the vapor recovery.

[0003] Its disadvantages are that after the channel is blocked, the gas stops flowing (completely shut off), causing the vacuum pump at the rear to remain stalled, greatly increasing the load, accompanied by temperature rise, noise, etc., and significantly reducing the pump's lifespan. At the same time, after stalling, the entire gas path (between the shut-off point and the pump) is under a large negative pressure, which is detrimental to the sealing of the oil path and the lifespan of the pipeline.

[0004] 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

[0005] In view of at least one of the above technical problems, this application discloses an ORVR sensing device, which aims to solve the technical problem that the vacuum pump negative pressure is too large after the existing oil and gas recovery refueling nozzle blocks the oil and gas recovery channel, resulting in a reduction in the service life of the secondary oil and gas recovery system.

[0006] According to one aspect of this disclosure, an ORVR sensing device is provided, comprising a housing for fixing to a vapor recovery refueling nozzle, a second channel formed within the housing with its inlet end correspondingly connected to the vapor collection hood of the vapor recovery refueling nozzle, a cavity connected to the outlet end of the second channel, a first channel with its inlet end connected to the cavity and its outlet end connected to the secondary vapor recovery system of the vapor recovery refueling nozzle via a vapor recovery channel, and an auxiliary channel for connecting the cavity and the vapor recovery channel; the first channel is arranged parallel to the second channel; the auxiliary channel and the first channel form an acute angle; the elastic sealing assembly includes a sensing diaphragm fixed to the housing by a pressure ring for sealing and forming the cavity, a sealing pressure plate embedded in the sensing diaphragm for sealing the inlet end of the first channel, and a spring sleeved outside the channel wall of the first channel with its corresponding end abutting against the sealing pressure plate; in a natural state, there is a certain gap between the inlet end of the first channel and the sealing pressure plate.

[0007] In some embodiments of this disclosure, the housing is fixedly provided with a cover corresponding to the outer side of the sensing diaphragm, and the cover is provided with an array of several vent holes.

[0008] In some embodiments of this disclosure, the auxiliary channel is located within the housing on a side opposite to the second channel.

[0009] In some embodiments of this disclosure, the angle between the auxiliary channel and the first channel is 40° to 70°.

[0010] In some embodiments of this disclosure, the gap width between the inlet end of the first channel and the sealing plate is less than the maximum deformation of the sensing diaphragm in its natural state.

[0011] In some embodiments of this disclosure, the diameter of the sealing plate is not less than the diameter of the first channel.

[0012] In some embodiments of this disclosure, the edge of the sensing diaphragm is provided with an annular portion with an arc-shaped cross-section, and the outlet end of the second channel faces the annular portion of the sensing diaphragm.

[0013] One or more technical solutions provided in the embodiments of this application have at least one of the following technical effects or advantages: 1. The technical solution of this application utilizes atmospheric pressure difference to control the opening and closing of the first channel through an elastic sealing component, thereby preventing the intake of fresh air when the oil and gas recovery refueling nozzle refuels a vehicle equipped with an on-board ORVR system, which would otherwise cause the secondary oil and gas recovery system to discharge an equal volume of oil and gas that would pollute the environment.

[0014] 2. Inside the housing, the second channel is arranged parallel to the first channel to avoid the oil and gas entering through the second channel impacting the spring; and the outlet end of the second channel is directly opposite the annular part of the sensing diaphragm. Thus, the arc surface of the annular part guides the oil and gas entering through the second channel, avoiding a direct impact on the sensing diaphragm. This avoids the problem of the sensing diaphragm vibrating due to the impact of the recovered gas, which would prevent the sealing plate from effectively sealing the first gas channel.

[0015] 3. An auxiliary channel is connected in parallel with the first channel. Because the diameter of the auxiliary channel is smaller than that of the first channel, it has no impact when the first channel is open. When the first channel is sealed, a small flow of gas flows through the auxiliary channel to ensure the normal operation of the vacuum pump in the secondary recovery system. This simple structure not only prevents the vacuum pump from overheating and wearing, thus extending its service life, but also effectively avoids the problem of high negative pressure in the gas pipeline of the entire secondary oil and gas recovery system affecting the separation of the gas and oil paths. Furthermore, the auxiliary channel is arranged at an acute angle to the first channel to improve the flow path unobstructed and avoid the problem of increased flow resistance to the recovered gas caused by bends in the flow path, thereby improving the gas recovery efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the ORVR sensing device in one embodiment of this application.

[0017] Figure 2 This is a cross-sectional view of an ORVR sensing device in one embodiment of this application.

[0018] In the above figures, 1 is the shell, 2 is the first channel, 3 is the second channel, 4 is the auxiliary channel, 5 is the elastic sealing component, 6 is the oil and gas recovery refueling gun, 7 is the gas collection hood, 8 is the oil and gas recovery channel, 9 is the protrusion, 10 is the sensing diaphragm, 11 is the sealing pressure plate, 12 is the spring, 13 is the protective cover, 14 is the vent hole, and 15 is the groove. Detailed Implementation

[0019] 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., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "connection" and "linkage" in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0020] Unless otherwise specified, the unit modules, components, structures, mechanisms, or sensors involved in the following embodiments are all commercially available products.

[0021] 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.

[0022] To address the technical problem of excessive vacuum pump negative pressure leading to a reduced lifespan of the secondary oil and gas recovery system after the existing oil and gas recovery refueling nozzle's oil and gas recovery channel is blocked, this embodiment discloses an ORVR sensing device, such as... Figure 1 , 2 As shown, it includes a housing 1, a first channel 2, a second channel 3, an auxiliary channel 4, and an elastic sealing assembly 5. The housing 1 is used to fix the oil and gas recovery refueling nozzle and serves as the carrier for the arrangement of the first channel 2, the second channel 3, the auxiliary channel 4, and the elastic sealing assembly 5.

[0023] like Figure 1 As shown, in this embodiment, the ORVR sensor is installed on the vapor recovery refueling nozzle 6 equipped with a secondary vapor recovery system to control the connection and disconnection between its gas collection hood 7 and the vapor recovery channel 8. Furthermore, when using the vapor recovery refueling nozzle 6 to refuel a vehicle equipped with an onboard ORVR system, the ORVR sensor of the vapor recovery refueling nozzle 6 should limit the vacuum pump of the vehicle's secondary vapor recovery system from drawing gas from the fuel tank into the underground fuel tank, allowing the onboard ORVR system to recover gas. Therefore, the housing 1 needs to have a first channel 2, a second channel 3, and a cavity, with the first channel 2 and the second channel 3 parallel to each other. The inlet end of the second channel 2 is connected to the gas collection hood 7 of the vapor recovery refueling nozzle, and the outlet end is connected to the cavity. The inlet end of the first channel 2 is connected to the cavity, and the outlet end is connected to the secondary vapor recovery system through the vapor recovery channel 8 perpendicular to the first channel 2. Thus, controlling the connection and disconnection between the vapor recovery refueling nozzle 6 and the secondary vapor recovery system is sufficient. However, when the vapor recovery refueling nozzle 6 refuels a vehicle equipped with an onboard ORVR system, the ORVR system causes negative pressure in the fuel tank. If the vapor recovery channel 8 in the vapor recovery refueling nozzle 6 is not blocked in time, it will cause fresh air from the outside to be drawn into the underground tank of the secondary vapor recovery system, forcing a medium volume of vapors in the underground tank to be released into the atmosphere, causing pollution. Therefore, in this embodiment, based on the principle of negative pressure generated in the ORVR vehicle fuel tank, elastic sealing components 5 are fixed at intervals on the housing 1 at the inlet end corresponding to the first channel 2, using pressure difference for sealing and blocking.

[0024] Specifically, such as Figure 2As shown, to create a pressure difference between the housing 1 and the atmosphere, a cavity is formed between the elastic sealing assembly 5 and the housing 1. The inner side of the elastic sealing assembly 5 is the cavity, and the outer side is the atmosphere, thus using the atmospheric pressure difference to seal the first channel 2. Furthermore, when the vapor recovery refueling nozzle 6 refuels a vehicle equipped with an onboard ORVR system, creating negative pressure in the cavity, the elastic sealing assembly 5 needs to block the first channel 2 to limit the vacuum pump of the vehicle's secondary vapor recovery system from extracting gas. When there is no negative pressure in the cavity, the elastic sealing assembly 5 allows the first channel 2 to reopen for gas recovery. Therefore, the elastic sealing assembly 5 needs to have an automatic reset function to control the opening and closing of the first channel 2. Specifically, in this embodiment, as... Figure 2 As shown, a protrusion 9 is provided at the inlet end of the first channel 2, so that the first channel 2 passes through the protrusion 9 and the inlet end is located at the end face of the protrusion 9; the elastic sealing assembly 5 includes a sensing diaphragm 10 that is fixed to the housing 1 by a pressure ring and has a certain gap with the protrusion 9 in its natural state, a sealing pressure plate 11 that is compositely embedded on the sensing diaphragm 10 corresponding to the inlet end of the first channel, and a spring 12 that is sleeved on the protrusion 9 at one end and abuts against the sealing pressure plate 11 at the other end. Preferably, to prevent the sealing plate from deforming due to the vacuum pump, the sealing plate is made of metal. To ensure the sealing effect of the sealing plate 11 on the inlet end of the first channel 2, the diameter of the sealing plate 11 is not less than the opening diameter of the inlet end of the first channel 2. Furthermore, the outer side of the sensing diaphragm 10 is exposed to the atmosphere, and the inner side is exposed to the recovered gas. When there is a negative pressure in the recovered gas inside the inner cavity, the sensing diaphragm 10 moves towards the protrusion 9 under the action of the atmospheric pressure difference, thereby sealing and blocking the inlet end of the first channel 2. When there is no negative pressure in the recovered gas inside the cavity, the sensing diaphragm 10 resets under the action of the spring 12. Considering that the sensing diaphragm 10 will be pushed and stretched by the atmospheric pressure difference, the sensing diaphragm 10 needs to have a certain degree of flexibility. Therefore, the sensing diaphragm 10 is made of a flexible soft material. In its natural state, the gap width between the outlet end of the first channel 2 and the sealing plate 11 is less than the maximum deformation of the sensing diaphragm 10, ensuring the extensibility of the sensing diaphragm. Considering that the sensing diaphragm 10 is directly exposed to the outside environment and is prone to damage from bumps and knocks, a protective cover 13 is fixed to the outer side of the sensing diaphragm 10 on the housing 1 to improve its service life. Several atmospheric pressure vent holes 14 are drilled through the protective cover 13, serving to protect the sensing diaphragm 10 and allow ventilation to the outside. Furthermore, to reduce the impact of the recovered gas on the sensing diaphragm 10, the outlet end of the second channel faces the annular portion at the edge of the sensing diaphragm.

[0025] After the elastic sealing component 5 seals the first channel 2, the gas inside the cavity of the housing 1 no longer flows, causing the vacuum pump of the secondary oil and gas recovery system to remain in a stalled state. This increases the load and is accompanied by increased temperature and noise, significantly reducing the lifespan of the vacuum pump. Simultaneously, the entire gas path of the secondary oil and gas recovery system is under significant negative pressure, affecting the sealing effect and reducing the lifespan of both the gas and oil paths. Therefore, in this embodiment, as... Figure 2 As shown, an auxiliary channel 4 is provided inside the housing 1 on a side different from the second channel 3. Its inlet end connects to the cavity, and its outlet end connects to the oil and gas recovery channel 8. The angle between the auxiliary channel 4 and the first channel 2 is 40–70°, resulting in a small fluid turning angle and low resistance, thus reducing the probability of gas blockage. The diameter of the auxiliary channel 4 is much smaller than that of the first channel 2, with a diameter difference of approximately 0.5–1.5 mm, and it is connected in parallel with the first channel 2. Simultaneously, the auxiliary channel 4 is normally open and unaffected by the overall device. When the standard airflow through the auxiliary channel 4 is 8–15 L / min, the required pressure difference should be 20–45 kPa. Preferably, when the first channel 2 is open, the auxiliary channel 4, due to its small diameter, has significantly greater resistance than the first channel 2, and is essentially not ventilated. When the first channel 2 is sealed and blocked, the auxiliary channel 4 can allow a small flow of gas, which not only ensures the normal operation of the vacuum pump in the secondary oil and gas recovery system, removes heat from the pump, and guarantees the lifespan of the vacuum pump, but also prevents the formation of a large vacuum in the gas pipeline of the secondary oil and gas recovery system, thereby reducing the risk of communication between the oil and gas lines of the secondary oil and gas recovery system caused by high pressure difference.

[0026] Specifically, when refueling a regular vehicle, because the vapor collection shroud 7 of the vapor recovery refueling nozzle 6 does not form a seal with the vehicle's fuel tank opening, the resistance of the recovered gas entering the shroud 7 from the fuel tank opening and the atmosphere through the first channel 2 is very small. Furthermore, due to the excessive resistance of the auxiliary channel 4, most of the recovered gas enters the vapor recovery channel 8 through the first channel 2, while the recovered gas passing through the auxiliary channel 4 is negligible. When refueling a vehicle equipped with an onboard ORVR system, because the vapor collection shroud 7 of the vapor recovery refueling nozzle 6 forms a seal with the vehicle's fuel tank opening, the negative pressure inside the cavity of the sensing diaphragm 10 is very high. Under the action of atmospheric pressure difference, this pushes the sensing diaphragm 10 and compresses the spring 12, causing the sealing plate 11 to seal the inlet end of the first channel 2, thus achieving a seal and blockage of the first channel 2. At this time, the recovered gas enters the vapor recovery channel 8 through the auxiliary channel 4, ensuring the normal operation of the vacuum pump of the secondary vapor recovery system.

[0027] In some other embodiments, considering that the airflow of the recovered gas can easily affect the spring 12, causing the spring 12 to move up and down in the protrusion 9, in order to ensure the stability of the spring 12 installation, a groove 15 is provided around the protrusion 9 so that the spring 12 can be embedded in the housing 1 for installation; at the same time, the second channel 3 and the auxiliary channel 4 are arranged at intervals with the groove 15, which greatly reduces the impact of the recovered gas on the spring 12 when it flows in the cavity.

[0028] Although some preferred embodiments of this application 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 this application.

[0029] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from the spirit and scope of its inventive concept. Therefore, if such modifications and variations to this disclosure fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. An ORVR sensing device, characterized in that, The system includes a housing for fixing to the vapor recovery refueling nozzle; a second channel formed within the housing with its inlet end corresponding to and connected to the vapor collection hood of the vapor recovery refueling nozzle; a cavity connected to the outlet end of the second channel; a first channel with its inlet end connected to the cavity and its outlet end connected to the secondary vapor recovery system of the vapor recovery refueling nozzle via the vapor recovery channel; and an auxiliary channel connecting the cavity and the vapor recovery channel. The first channel is parallel to the second channel. The auxiliary channel and the first channel form an acute angle. The system also includes an elastic sealing assembly, which includes a sensing diaphragm embedded in the housing by a pressure ring and used to correspondingly close and form the cavity; a sealing pressure plate embedded in the sensing diaphragm and used to close the inlet end of the first channel; and a spring sleeved on the channel wall of the first channel with its corresponding end abutting against the sealing pressure plate. In its natural state, there is a certain gap between the inlet end of the first channel and the sealing pressure plate.

2. The ORVR sensing device according to claim 1, characterized in that, The housing is fixedly provided with a cover on the outer side of the sensing diaphragm, and the cover is provided with a plurality of vent holes in an array.

3. The ORVR sensing device according to claim 1, characterized in that, The auxiliary channel is located inside the housing on a side opposite to the second channel.

4. The ORVR sensing device according to claim 3, characterized in that, The angle between the auxiliary channel and the first channel is 40° to 70°.

5. The ORVR sensing device according to claim 1, characterized in that, In its natural state, the gap width between the inlet end of the first channel and the sealing plate is less than the maximum deformation of the sensing diaphragm.

6. The ORVR sensing device according to claim 5, characterized in that, The diameter of the sealing plate is not less than the diameter of the first channel.

7. The ORVR sensing device according to claim 1, characterized in that, The edge of the sensing diaphragm has an annular portion with an arc-shaped cross-section, and the outlet end of the second channel faces the annular portion of the sensing diaphragm.

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