Isolation valve, fuel vapor emission system, and vehicle

Abstract

This application relates to an isolation valve, a fuel evaporative emission system, and a vehicle, including a valve housing and a valve core. The valve housing has a valve cavity and a first opening and a second opening communicating with the valve cavity. The valve core is movably disposed in the valve housing and configured to switch between a first state and a second state under the action of an external force. The first opening is used to communicate with a carbon canister. When the valve core is in the first state, both the first opening and the second opening are communicating with the valve cavity. When the valve core is in the second state, the valve core blocks the communication between the first opening and the valve cavity. By blocking the communication between the first opening and the valve cavity during the closed monitoring phase, the tendency of gas from the carbon canister side to diffuse into the valve cavity can be limited, thereby helping to reduce the risk of gas leakage along the valve core's connection to the outside environment. This, in turn, helps to maintain the overall sealing performance of the isolation valve to meet the sealing requirements of the closed monitoring environment.

Description

Technical Field

[0001] This application relates to the field of automotive fuel evaporative emission control technology, and in particular to an isolation valve, a fuel evaporative emission system, and a vehicle. Background Technology

[0002] In evaporative emission control systems (EVAP), the amount of fuel allowed to evaporate into the atmosphere is strictly limited. Therefore, on-board diagnostics (OBD) systems are widely used to monitor the seal integrity of EVAP systems. OBD systems typically control the opening and closing of the carbon canister solenoid valve (i.e., purge valve) and isolation valve, creating a relatively independent, sealed system for the entire evaporative system during the monitoring phase. By detecting changes in the internal pressure of this sealed system over a preset time period, the system can determine if leaks exist, such as the risk of fuel vapor leakage caused by broken connecting pipes, loose joints, or failed component seals.

[0003] However, the isolation valve used in the relevant technology has unstable sealing performance during the sealing process. It may introduce external air or cause fuel vapor to escape during the closed monitoring stage, thereby disrupting the internal pressure change curve of the system, causing abnormal monitoring data, and affecting the OBD system's accurate judgment of the leakage status of the evaporation system. Utility Model Content

[0004] This application provides an isolation valve, a fuel evaporation emission system, and a vehicle, which improves the sealing performance of the isolation valve during the closed monitoring phase, thereby at least partially solving the aforementioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, an isolation valve is provided, comprising:

[0006] Valve housing, having a valve cavity and a first opening and a second opening communicating with the valve cavity; and

[0007] The valve core, movably disposed in the valve housing, is configured to switch between a first state and a second state under the action of an external force;

[0008] Wherein, the first opening is used to communicate with the carbon canister, and when the valve core is in the first state, both the first opening and the second opening are in communication with the valve cavity; when the valve core is in the second state, the valve core blocks the first opening from communicating with the valve cavity.

[0009] In some embodiments, the isolation valve further includes a drive unit disposed on the valve housing for driving the valve core to switch between the first state and the second state.

[0010] In some embodiments, the drive element includes a moving iron core movably disposed on the valve housing and connected to the valve core. The moving iron core is configured to move relative to the valve housing under magnetic force to drive the valve core to switch between the first state and the second state.

[0011] In some embodiments, the drive element further includes a coil arranged around the moving iron core, wherein when the valve core is in the first state, the moving iron core is located within the coil;

[0012] And / or, when the valve core is in the second state, at least a portion of the moving iron core is located within the valve cavity.

[0013] In some embodiments, the drive element further includes a stationary iron core disposed on the valve housing, the stationary iron core being located on the side of the moving iron core away from the valve cavity.

[0014] In some embodiments, when the valve core is in the first state, the moving iron core is separated from the stationary iron core;

[0015] And / or, when the valve core is in the second state, the moving iron core and the stationary iron core are attracted together.

[0016] In some embodiments, the isolation valve further includes a buffer element disposed on the movement path of the valve core to buffer the valve core during the switching process from the second state to the first state.

[0017] In some embodiments, the buffer includes an elastic portion, and when the valve core is in the first state, at least a portion of the valve core contacts the elastic portion to buffer the valve core.

[0018] In some embodiments, the isolation valve further includes an elastic element for returning the valve core to the first state or the second state.

[0019] In some embodiments, when the valve core is in the second state, the elastic element is located inside the valve cavity.

[0020] In some embodiments, the valve housing has a third opening communicating with the valve cavity, and the valve housing includes a valve cover that is sealed to the third opening.

[0021] In some embodiments, the buffer of the isolation valve is disposed on the valve cover.

[0022] In some embodiments, the first opening communicates with the valve cavity through a first channel, the valve core includes a first sealing portion, and the valve housing has a second sealing portion within the first channel;

[0023] When the valve core is in the second state, the first sealing part and the second sealing part cooperate to close the first channel.

[0024] In some embodiments, during the process of the valve core switching from the first state to the second state, the first sealing portion moves from the side away from the valve cavity toward the side closer to the valve cavity.

[0025] In some embodiments, the second sealing portion includes a boss, and the first sealing portion engages with the boss to close the first channel.

[0026] In some embodiments, at least one of the first sealing portion and the second sealing portion is provided with a sealing element.

[0027] In some embodiments, the seal is located at the first sealing portion.

[0028] In some embodiments, the first sealing portion includes an annular platform, and when the valve core is in the second state, the sealing element is located between the annular platform and the second sealing portion.

[0029] In some embodiments, the elastic element of the isolation valve is located between the first sealing portion and the valve housing, and at least a portion of the elastic element abuts against the sealing element so that the sealing element conforms to the annular platform.

[0030] In some embodiments, the first sealing portion is disposed between the second sealing portion and the valve cover of the valve housing.

[0031] According to a second aspect of this application, a fuel evaporation emission system is provided, including the isolation valve described in the above-described technical solution.

[0032] In some embodiments, a carbon canister is included, with the first opening communicating with the carbon canister and the second opening communicating with the atmosphere.

[0033] In some embodiments, the fuel vapor emission system includes an ash filter, the second opening being in communication with the ash filter, and the ash filter being in communication with the atmosphere.

[0034] According to a third aspect of this application, a vehicle is provided, including the isolation valve described in the above-described technical solution, or the fuel evaporation emission system described in the above-described technical solution.

[0035] In the isolation valve of this application embodiment, by controlling the valve core to switch to the second state to block the communication between the valve cavity and the first opening, a fluid isolation state is formed between the carbon canister side and the valve cavity. This setting helps to limit the diffusion of gas in the carbon canister towards the valve cavity during the closed monitoring stage, and reduces the possibility of gas leakage along the valve core and the external communication part. This helps to maintain the overall sealing performance of the isolation valve and meet the requirements of the closed monitoring environment.

[0036] By creating a fluid isolation between the gas on the carbon canister side and the valve chamber, the entry of external air into the system along the carbon canister path can be further suppressed, while also preventing fuel vapor from escaping from the system to the environment. This maintains the stability of the internal pressure changes, thereby improving the discriminability of pressure data during closed-loop monitoring and enhancing the accuracy of the on-board diagnostic (OBD) system in identifying leaks in the evaporative emission system.

[0037] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0040] Figure 1 This is a schematic diagram of the overall structure of the isolation valve provided in an exemplary embodiment of this disclosure;

[0041] Figure 2 This is a cross-sectional view of the isolation valve in the first state provided in the exemplary embodiment of this disclosure;

[0042] Figure 3 This is a cross-sectional view of the isolation valve in the second state provided in an exemplary embodiment of this disclosure;

[0043] Figure 4 This is a cross-sectional view of the valve housing provided in an exemplary embodiment of this disclosure;

[0044] Figure 5 This is a schematic diagram of the structure of the moving iron core and valve core provided in the exemplary embodiments of this disclosure;

[0045] Figure 6This is a schematic diagram of the structure of the valve cover and buffer provided in an exemplary embodiment of this disclosure;

[0046] Figure 7 This is a schematic diagram of gas flow between the modules of the fuel evaporation emission system provided in an exemplary embodiment of this disclosure.

[0047] Explanation of reference numerals in the attached figures:

[0048] 10. Isolation valve; 20. Carbon canister; 30. Ash filter; 100. Valve body; 110. Valve cavity; 120. First opening; 130. Second opening; 140. Third opening; 150. First channel; 160. Second channel; 170. Valve cover; 180. Second sealing part; 181. Boss; 200. Valve core; 210. First sealing part; 211. Sealing element; 212. Ring platform; 300. Driving element; 310. Moving iron core; 320. Stationary iron core; 330. Coil; 400. Buffer element; 410. Elastic part; 500. Elastic element. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0050] According to the first aspect of this application, referring to Figures 1 to 6 This disclosure provides an isolation valve 10 applied to a fuel evaporative emission system. Exemplarily, the fuel evaporative emission system includes a carbon canister 20, and the isolation valve 10 is used to control the connection or blockage between the carbon canister 20 and the outside environment to adapt to operating requirements under different conditions. Furthermore, the isolation valve 10 can also prevent the infiltration of external liquids or gases under specific operating conditions, thereby enhancing the system's environmental adaptability to a certain extent.

[0051] Specifically, during use, when the isolation valve 10 is opened, a conductive path is formed between the carbon canister 20 and the outside world (e.g., the carbon canister 20 is connected to the atmosphere). At this time, the fuel vapor emission system can enter the desorption operation stage, relying on negative pressure or other methods to export the fuel vapor adsorbed in the carbon canister 20 to the external environment or intake system, thereby realizing the regeneration function of the carbon canister 20, which is beneficial to improving the continuous adsorption capacity of the carbon canister 20 and maintaining the long-term working stability of the system.

[0052] When the isolation valve 10 is closed, it blocks the passage between the external pipeline and the carbon canister 20, effectively isolating the carbon canister 20 from the atmosphere. At this time, a fluid isolation state is formed between the carbon canister 20 and the outside environment. The gas inside the carbon canister 20 is effectively confined within the canister 20 and is not connected to external pipelines or the atmosphere. In this structural state, the gas inside the carbon canister 20 cannot diffuse into the external environment and is not disturbed by the outside air.

[0053] During the closed-loop monitoring phase, this fluid isolation ensures the airtightness of the gas within the carbon canister 20, thereby maintaining the stability of the system's internal pressure. The stability of the pressure change curve helps improve the accuracy of the on-board diagnostic (OBD) system in detecting leaks in the evaporative emission system during monitoring. Because the gas within the carbon canister 20 is effectively isolated, the OBD system can more accurately identify minute leaks within the system, providing a more reliable leak status assessment, thus enhancing the accuracy and reliability of emission system detection.

[0054] In addition, in certain specific application scenarios, such as when a vehicle is wading through water, in order to prevent external moisture from entering the carbon canister 20 through the air intake path, which could cause the packing of the carbon canister 20 to become saturated with moisture or the structure to be damaged, the isolation valve 10 can also be switched to the blocking state to block the channel connection between the outside and the carbon canister 20.

[0055] In some embodiments, refer to Figure 1 , Figure 2 The isolation valve 10 includes a valve body 100 and a valve core 200. The valve body 100 has a valve cavity 110 and a first opening 120 and a second opening 130 communicating with the valve cavity 110. Exemplarily, in use, the first opening 120 communicates with the carbon canister 20, and the second opening 130 communicates with the outside. It should be noted that the communication between the first opening 120 and the carbon canister 20 can be direct or indirect through other components. For example, there may be pipes, valves, or other intermediary components between the first opening 120 and the carbon canister 20. In this case, the connection between the carbon canister 20 and the first opening 120 is not direct but achieved through these intermediary components.

[0056] For example, the first opening 120 is connected to the valve chamber 110 through the first channel 150, and the second opening 130 is connected to the valve chamber 110 through the second channel 160.

[0057] In some embodiments, refer to Figure 2 , Figure 3The valve core 200 is movably disposed on the valve housing 100 and is configured to switch between a first state and a second state under the action of an external force. When the valve core 200 is in the first state, both the first opening 120 and the second opening 130 are connected to the valve chamber 110, allowing gas to flow between the carbon canister 20 and the outside environment. When the valve core 200 is in the second state, it blocks the connection between the first opening 120 and the valve chamber 110, that is, it blocks the first channel 150, thereby closing the channel between the carbon canister 20 and the valve chamber 110, forming a fluid isolation state.

[0058] When the valve core 200 is in the second state, gas in the carbon canister 20 can no longer enter the valve chamber 110 through the first opening 120, thus preventing gas leakage through the portion of the valve core 200 connected to the outside in the valve chamber 110. In this structure, when the isolation valve 10 is in the second state, gas exchange between the carbon canister 20 and the external passage is effectively controlled and blocked, preventing improper leakage of gas from the carbon canister 20. This design helps to avoid fluctuations in monitoring data caused by gas leakage during the closed-loop monitoring phase, ensuring that the on-board diagnostic system (OBD) can accurately determine the leakage status of the evaporative emission system.

[0059] It is understood that the valve core 200 of this application can be driven in other ways besides switching between the first and second states via electromagnetic drive, such as manual drive or electric drive (e.g., electric motor drive). In these drive methods, the drive mechanism itself may be connected to the external environment, such as the coil 330 in electromagnetic drive, the mechanical connection component in manual drive, or the electric motor in electric drive. The structure of these drive mechanisms may lead to the possibility of leakage between the valve chamber 110 and the outside world, especially when the drive mechanism is connected to the outside world through the valve chamber 110.

[0060] However, this embodiment is designed to effectively isolate the first opening 120 from the valve chamber 110, avoiding the risk of gas leakage through the valve chamber 110. When the valve core 200 switches to the second state, it blocks the connection between the first opening 120 and the valve chamber 110, effectively preventing gas leakage to the outside through the valve chamber 110. Even when using electromagnetic, manual, or electric drive, the isolation structure between the first opening 120 and the valve chamber 110 ensures that there is no improper gas leakage between the valve chamber 110 and the outside, thereby improving the system's sealing and stability.

[0061] The key to this design is that by connecting the isolation valve 10 chamber to the outside world, the leakage problem that may be caused by the driving method is eliminated, ensuring that the gas flow between the carbon canister 20 and the outside world is effectively controlled, avoiding gas leakage caused by the connection between the driving device and the outside world, thereby helping to improve the accuracy of the on-board diagnostic system (OBD) in monitoring the leakage status of the evaporative emission system.

[0062] In some embodiments, refer to Figure 2 , Figure 3 The isolation valve 10 also includes a drive element 300, which is disposed in the valve housing 100 and is used to drive the valve core 200 to switch between a first state and a second state. By driving the isolation valve 10 through the drive element 300, the valve core 200 can be switched between different working states, thereby realizing the flow control between the valve chamber 110 and the carbon canister 20 side or the external channel.

[0063] Specifically, the drive unit 300 can be an electromagnetic drive unit 300, an electric motor, a pneumatic drive, or a manual drive, etc. Different drive methods can provide different drive capabilities and response speeds according to the needs of the application scenario.

[0064] In some embodiments, refer to Figure 2 , Figure 3 The drive unit 300 includes a moving iron core 310, which is movably disposed on the valve housing 100 and connected to the valve core 200. The moving iron core 310 is configured to move relative to the valve housing 100 under the action of magnetic force, so as to drive the valve core 200 to switch between a first state and a second state.

[0065] Specifically, the moving iron core 310 is typically used in conjunction with an electromagnetic coil 330 or other magnetic field source. When the electromagnetic coil 330 is energized, it generates a magnetic field that acts on the moving iron core 310, causing the moving iron core 310 to displace relative to the valve body 100. Since the moving iron core 310 is connected to the valve core 200, the displacement of the moving iron core 310 will drive the movement of the valve core 200, thereby switching the valve core 200 between the first state and the second state.

[0066] In some embodiments, the drive unit 300 further includes a coil 330, which is arranged around the moving iron core 310. When the valve core 200 is in the first state, the moving iron core 310 is located inside the coil 330. Through electromagnetic action, the magnetic field generated by the coil 330 can drive the moving iron core 310 to move relative to the valve housing 100, thereby causing the valve core 200 to switch to the second state.

[0067] In some embodiments, refer to Figure 2 , Figure 3When the valve core 200 is in the second state, at least a portion of the moving iron core 310 is located within the valve cavity 110. Since the moving iron core 310 can move outside the coil 330 and into the valve cavity 110 during operation, this design effectively reduces the size requirements of the coil 330. Compared to the conventional design where the moving iron core 310 is completely confined within the coil 330, the configuration of this embodiment optimizes the volume of the coil 330, thereby reducing the overall size of the isolation valve 10. This compact design helps achieve effective valve control within a limited space, improving system integration and application flexibility.

[0068] In some embodiments, refer to Figure 3 , Figure 4 The drive unit 300 also includes a stationary iron core 320, which is disposed in the valve housing 100 and located on the side of the moving iron core 310 away from the valve cavity 110. The placement of the stationary iron core 320 can optimize the movement process of the moving iron core 310, enhance the movement performance of the moving iron core 310 within the valve housing 100, and enable it to switch more smoothly between the first and second states.

[0069] Specifically, the stationary iron core 320 provides a stable magnetic field path, enhancing the electromagnetic drive effect, thereby enabling the moving iron core 310 to effectively respond to electromagnetic force and precisely drive the valve core 200 to switch. In this way, the stationary iron core 320 can improve the activity efficiency of the moving iron core 310, ensuring rapid switching of the valve core 200 between the two states, thereby improving the response speed and reliability of the isolation valve 10.

[0070] Furthermore, the stationary iron core 320 is located on the side opposite to the moving iron core 310. This design allows the moving iron core 310 to move towards the valve cavity 110, further optimizing its displacement path. The displacement of the moving iron core 310 enables the valve core 200 to switch to the second state. Simultaneously, the moving iron core 310's operating space is utilized efficiently, thus helping to reduce the overall size of the isolation valve 10. This compact design not only effectively reduces the valve body size but also improves system integration, adapting to more limited installation space requirements.

[0071] In some embodiments, refer to Figure 2 , Figure 3 When the valve core 200 is in the first state, the moving iron core 310 and the stationary iron core 320 are separated. This arrangement allows the valve core 200 to be in the first state even when the coil 330 is not energized. In this state, the first opening 120 is connected to the valve chamber 110, allowing fluid communication between the gas on the carbon canister 20 side and the valve chamber 110, thus achieving normal gas channel connection. This design allows the carbon canister 20 to be connected to the outside environment, making it suitable for desorption operations and other stages, so that the adsorbed gas inside the carbon canister 20 can be released smoothly.

[0072] In some embodiments, when the valve core 200 is in the second state, the moving iron core 310 and the stationary iron core 320 are attracted together. In this state, the coil 330 is energized, and the current causes the moving iron core 310 to be magnetically attracted, attracting it to the stationary iron core 320, thereby switching the valve core 200 to the second state. In this state, the channel between the first opening 120 and the valve chamber 110 is blocked, forming a gas isolation. In this way, the gas on the carbon canister 20 side is confined inside the carbon canister 20, effectively preventing gas leakage through the valve chamber 110 and ensuring the stability of the sealed monitoring stage.

[0073] This design allows the isolation valve 10 to switch flexibly under different working conditions. By using electromagnetic control, the state of the valve core 200 can be precisely adjusted, thereby ensuring that the channel between the carbon canister 20 and the outside world can be opened and closed as needed.

[0074] In some embodiments, refer to Figure 2 , Figure 3 The isolation valve 10 also includes a buffer element 400, which is disposed on the movement path of the valve core 200 to buffer the valve core 200 during the switching process from the second state to the first state. Specifically, when the valve core 200 switches from the second state to the first state, the magnetic force on the moving iron core 310 disappears, and the valve core 200 will move quickly and switch to the first state. For example, it can be driven by the elastic element 500 to make the valve core 200 quickly return to the first state. In addition, the valve core 200 can also quickly return to the first state under the combined action of the gravity of the moving iron core 310 and the valve core 200, as well as the air pressure inside the valve cavity 110. In this process, the buffer element 400 plays a role in slowing down the movement speed of the valve core 200, avoiding violent impact on the valve core 200 during rapid switching, thereby reducing mechanical vibration and noise.

[0075] The buffer 400 helps improve the smoothness of valve core 200 switching, ensuring greater stability of the isolation valve 10 during operation, reducing noise and vibration caused by valve core 200 movement, thereby improving system comfort and durability. The buffer 400's mitigating effect effectively extends the service life of valve core 200 and related components, ensuring that valve core 200 is not subjected to excessive impact during switching, avoiding malfunctions caused by excessive wear or impact. Furthermore, the buffer 400 also helps reduce system noise during operation, contributing to a better driving experience.

[0076] In some embodiments, the buffer 400 includes an elastic portion 410. When the valve core 200 is in a first state, at least a portion of the valve core 200 contacts the elastic portion 410 to cushion the valve core 200. Specifically, when the valve core 200 switches from a second state to a first state, the valve core 200 moves back to its position in the first state, eventually causing a portion of the valve core 200 to contact the elastic portion 410. At this time, the elastic portion 410 provides the necessary cushioning effect to reduce the impact between the valve core 200 and the contact surface of the valve cavity 110, and to reduce the vibration and noise caused by the movement of the valve core 200.

[0077] It is understandable that the buffer 400 as a whole can be made of elastic material to ensure effective cushioning during the switching process of the valve core 200; on the other hand, the buffer 400 can also use elastic material only in the part that contacts the valve core 200, so that it only plays an elastic role when the valve core 200 contacts the buffer 400. This design can achieve vibration reduction and noise control without affecting the overall structural strength.

[0078] For example, the buffer 400 can be made of rubber or other elastic materials, such as springs. This embodiment does not specifically limit the material of the buffer 400. Specifically, due to its good elasticity and wear resistance, rubber can provide a smooth buffering effect when the valve core 200 switches, reducing impact force, lowering noise, and effectively extending the service life of the valve assembly. In addition, rubber has a certain degree of shock resistance and corrosion resistance, making it suitable for use in harsh working environments, such as high-temperature or chemically corrosive environments.

[0079] Besides rubber, the buffer 400 can also use a spring as a buffer component. The spring, through its elastic properties, can provide a certain reaction force during the switching of the valve core 200, helping to smooth the transition and thus reducing the direct contact force between the valve core 200 and the valve chamber 110. The stiffness and elasticity of the spring can be adjusted as needed to ensure optimal buffering effect during valve core 200 switching. The use of springs is particularly suitable for applications requiring greater buffering force or longer service life.

[0080] Whether the material is rubber or spring, the selection of the buffer 400 should be determined based on factors such as the working environment, frequency of use, and load-bearing capacity of the isolation valve 10, in order to ensure that it provides effective buffering while meeting the reliability and stability requirements of the system.

[0081] In some embodiments, refer to Figure 2 , Figure 3The isolation valve 10 also includes a resilient element 500, which is used to restore the valve core 200 to a first state or a second state. Specifically, the resilient element 500 provides a restoring force, enabling the valve core 200 to automatically return to a predetermined initial position or state during electromagnetic actuation. Depending on the operation of the isolation valve 10, the resilient element 500 can adjust the return position of the valve core 200 according to the on / off state of the electromagnetic actuation.

[0082] For example, if the isolation valve 10 is a valve that closes when energized (i.e., the valve core 200 is in the second state when energized), when the coil 330 is de-energized, the elastic element 500 will restore the valve core 200 to the first state. At this time, the elastic element 500 ensures that the valve core 200 automatically returns to the open state after de-energization through its elastic force, thereby reconnecting the first opening 120 and the valve chamber 110.

[0083] Conversely, if the isolation valve 10 is an energized valve (i.e., the valve core 200 is in the first state when energized), when the coil 330 is de-energized, the elastic element 500 will restore the valve core 200 to the second state, thereby blocking the passage between the first opening 120 and the valve chamber 110. At this time, the elastic element 500 ensures that the valve core 200 automatically returns to the closed state after de-energization through its restoring force, effectively isolating the fluid passage between the carbon canister 20 and the outside world.

[0084] In some embodiments, when the valve core 200 is in the second state, the elastic element 500 is located within the valve cavity 110. Specifically, when the valve core 200 is in the second state, it can effectively isolate the first opening 120 from the valve cavity 110, so that the elastic element 500 is located within the relatively closed valve cavity 110. Since the first opening 120 is connected to the carbon canister 20 during the sealing monitoring phase, the gas on the carbon canister 20 side may contain a certain concentration of fuel vapor or other high-density particulate matter. If the elastic element 500 is directly exposed to this airflow path, it may cause surface adsorption, adhesion, or changes in material properties to a certain extent, thereby affecting the recovery performance or sealing stability of the elastic element 500.

[0085] By placing the elastic element 500 within the valve cavity 110 in the second state, it can avoid direct contact with the gas environment on the carbon canister 20 side, helping to reduce the risk of foreign matter adhesion and maintain the long-term stability of the elastic element 500. Furthermore, the valve cavity 110 area where the elastic element 500 is located can achieve a relatively clean working environment through structural optimization, such as by incorporating guide holes or blind cavity structures to guide or isolate part of the gas flow path, thereby further improving the reliability and responsiveness of the elastic element 500.

[0086] For example, the elastic element 500 can be a structural component with elastic recovery properties, such as a helical compression spring, a wave spring, or an elastic rubber pad.

[0087] In some embodiments, refer to Figure 4 , Figure 6 The valve housing 100 has a third opening 140, which communicates with the valve cavity 110. The valve housing 100 includes a valve cover 170, which is sealed to the third opening 140. The third opening 140 facilitates convenient installation and maintenance of the various components within the valve cavity 110. Specifically, the design of the third opening 140 allows for easy installation, cleaning, or maintenance of the internal components of the valve cavity 110 within the valve body's structure.

[0088] For example, the sealing connection between the valve cover 170 and the third opening 140 ensures that the valve chamber 110 does not leak fluid during operation, thus maintaining the system's airtightness. This sealing connection effectively prevents fluid leakage inside the valve chamber 110, ensuring the stability and efficient operation of the isolation valve 10. During installation, components such as the valve core 200 can be quickly installed through the third opening 140, simplifying the installation process and reducing production costs.

[0089] For example, the sealing connection between the valve cover 170 and the third opening 140 can be achieved through interference fit, welding, or a combination of both. With an interference fit, the valve cover 170 can fit tightly with the third opening 140, ensuring sealing performance and structural strength; welding further enhances the sealing between the valve cover 170 and the valve body 100, ensuring no leakage during long-term operation. The combined use of both methods not only improves the sealing effect but also effectively enhances the convenience and stability of installation, ensuring the service life and maintainability of the valve body.

[0090] In some embodiments, refer to Figure 4 , Figure 6 The buffer element 400 of the isolation valve 10 is disposed on the valve cover 170. This design not only facilitates the installation of the buffer element 400, but also allows the buffer element 400 to be located inside the valve cavity 110. Compared with the conventional design where the buffer element 400 is disposed within the moving iron core 310 or stationary iron core 320 of the coil 330, placing the buffer element 400 on the valve cover 170 effectively saves internal space of the coil 330, thereby reducing the size of the coil 330. This allows for a reduction in the overall size of the isolation valve 10, contributing to improved product compactness and better adapting to installation requirements in space-constrained applications.

[0091] In addition, the placement of the buffer 400 at the valve cover 170 position can effectively avoid the interference of the buffer 400 to the coil 330 in the traditional design, improve the switching efficiency and stability of the valve core 200, and further improve the overall performance of the isolation valve 10 by optimizing the spatial layout.

[0092] In some embodiments, refer to Figure 4 , Figure 5 The first opening 120 communicates with the valve chamber 110 through the first channel 150. The valve core 200 includes a first sealing part 210, and the valve housing 100 has a second sealing part 180 within the first channel 150. When the valve core 200 is in the second state, the first sealing part 210 and the second sealing part 180 cooperate to seal the first channel 150, thereby preventing gas exchange between the valve chamber 110 and the carbon canister 20 or the outside environment. This design helps to prevent gas from leaking to the outside through the first channel 150 in closed monitoring or other application scenarios, maintaining the fluid isolation between the valve chamber 110 and the outside environment. Due to the cooperation of the sealing components, the sealing performance can be improved, ensuring the sealing stability of the system, thereby enhancing the accuracy of the on-board diagnostic system in monitoring the leakage status of the evaporative emission system.

[0093] In some embodiments, during the switching process of the valve core 200 from a first state to a second state, the first sealing portion 210 moves from the side away from the valve cavity 110 toward the side closer to the valve cavity 110. Specifically, when the valve core 200 moves from the side away from the valve cavity 110 to the side closer to the valve cavity 110, it can block the valve cavity 110 from the first opening 120. Since the first opening 120 is used to communicate with the carbon canister 20, during the sealing test, the pressure on the carbon canister 20 side increases, thereby creating a pressure difference between the side of the first sealing portion 210 located in the valve cavity 110 and the side located in the first opening 120. This pressure difference causes the first sealing portion 210 to move toward the valve cavity 110. Since this direction of movement is consistent with the sealing direction, it is beneficial to the fit and seal between the first sealing portion 210 and the second sealing portion 180, thereby improving the overall sealing performance.

[0094] For example, during the process of the valve core 200 switching from the first state to the second state, the first sealing part 210 gradually approaches the second sealing part 180 until the valve core 200 is in the second state, at which point the first sealing part 210 and the second sealing part 180 will cooperate to form a sealing structure. When the valve core 200 is in the second state, one side of the first sealing part 210 (i.e., the side facing the first opening 120) is subjected to gas pressure from the carbon canister 20 side, while the other side (i.e., the side facing the valve cavity 110) is a relatively low-pressure area. This creates a pressure difference on both sides of the first sealing part 210, thereby generating a force towards the valve cavity 110. This force helps to push the first sealing part 210 to fit more stably with the second sealing part 180.

[0095] When the valve core 200 is in the second state, the first sealing part 210 tends to face the sealing contact direction. Therefore, even with assembly tolerances or slight wear, the first sealing part 210 can still maintain a relatively stable sealing effect to a certain extent. This design can help improve the airtightness of the entire valve body in the closed state, thereby improving the sealing performance and reliability of the isolation valve 10 in practical applications.

[0096] In some embodiments, the second sealing portion 180 includes a boss 181, and the first sealing portion 210 cooperates with the boss 181 to close the first channel 150. Specifically, the first sealing portion 210 of the valve core 200 can contact the boss 181 inside the valve housing 100. When the valve core 200 switches to the second state, the first sealing portion 210 and the boss 181 are tightly fitted together to form a seal, ensuring that the first channel 150 is closed and preventing gas from leaking through the channel.

[0097] This design effectively improves sealing performance because the structure of the boss 181 provides a more stable sealing contact surface. The cooperation between the valve core 200 and the boss 181 makes the seal of the valve core 200 in the second state more robust, avoiding any potential leakage paths and ensuring fluid isolation between the valve cavity 110 and the outside environment.

[0098] In some embodiments, refer to Figure 3 , Figure 5 At least one of the first sealing part 210 and the second sealing part 180 is provided with a sealing element 211. The sealing effect can be improved by the sealing element 211. Specifically, the sealing element 211 can be a sealing ring, rubber ring, etc., which have good elasticity and sealing performance and can effectively prevent fluid leakage.

[0099] In some embodiments, the seal 211 is located in the first sealing portion 210. Installing the seal 211 in the first sealing portion 210 offers greater ease of installation and lower installation costs compared to installing it in the second sealing portion 180. Specifically, placing the seal 211 in the first sealing portion 210 simplifies the assembly process because the valve core 200 is installed into the valve cavity 110 during a later installation. Therefore, placing the seal 211 in the first sealing portion 210 means that throughout the assembly process, the operator can directly install and mate the seal 211 from the outside, reducing the need for complex operations within the valve cavity 110. In this way, precise fit between the seal 211 and the first sealing portion 210 can be more easily ensured, thereby improving assembly efficiency and reducing potential errors or problems during installation.

[0100] In some embodiments, refer to Figure 3 , Figure 5The first sealing part 210 includes an annular platform 212. When the valve core 200 is in the second state, the sealing element 211 is located between the annular platform 212 and the second sealing part 180. The design of the annular platform 212 provides a stable installation position for the sealing element 211 and also effectively supports it. When the valve core 200 is in the second state, the sealing element 211 is sandwiched between the boss 181 and the annular platform 212. This structural design ensures that the sealing element 211 effectively fills the gap between the boss 181 and the annular platform 212, thereby achieving a good sealing effect.

[0101] Specifically, when the valve core 200 switches to the second state, the seal 211, in cooperation with the annular mandrel 212 and the second sealing part 180, provides a complete seal between the contact surfaces, preventing fluid leakage. The annular mandrel 212 not only provides the installation position but also ensures that the seal 211 maintains its correct positioning during operation, preventing seal failure due to vibration or external force. This design effectively enhances the sealing performance of the isolation valve 10, reduces leakage between the valve core 200 and the valve body 100, and improves the system's operational stability and safety.

[0102] In some embodiments, refer to Figure 2 , Figure 3 The elastic element 500 of the isolation valve 10 is located between the first sealing part 210 and the valve body 100, and at least a portion of the elastic element 500 abuts against the sealing element 211 so that the sealing element 211 fits against the annular platform 212. Through this design, the elastic element 500 provides a supporting and positioning force for the sealing element 211, thereby ensuring that the sealing element 211 does not move relative to the valve body during operation, preventing the sealing element 211 from loosening or falling off during the operation of the valve core 200, thus effectively improving the stability and reliability of the seal.

[0103] Specifically, the seal 211 is detachably mounted on the first sealing portion 210. The elastic member 500, by abutting against the seal 211, can restrict the position of the seal 211, ensuring that the seal 211 maintains tight contact with the annular mandrel 212 during use. When the valve core 200 is in the second state, the seal 211 can effectively fill the gap between the annular mandrel 212 and the second sealing portion 180, thereby preventing fluid leakage. The elastic member 500 not only supports the seal 211 in this process but also provides a certain restoring force, ensuring that the seal 211 is always in the correct sealing position.

[0104] By placing the elastic element 500 between the first sealing part 210 and the valve body 100 and cooperating with the sealing element 211, the sealing performance of the isolation valve 10 can be effectively improved, and the stability of the sealing performance can be maintained during long-term use, thereby improving the overall performance and service life of the isolation valve 10.

[0105] In some embodiments, refer to Figure 2 , Figure 3 The first sealing part 210 is disposed between the second sealing part 180 and the valve cover 170 of the valve housing 100. By arranging the first sealing part 210 in this position, it is helpful to install the valve core 200 to the predetermined position through the valve cover 170 position during the assembly process, so that the first sealing part 210 can effectively cooperate with the second sealing part 180, thereby helping to achieve a stable sealing effect.

[0106] Since the first sealing part 210 is disposed on the valve core 200, while the second sealing part 180 is disposed inside the valve housing 100, during assembly, the valve core 200 can be inserted into the valve cavity 110 from one side of the valve housing 100 through the third opening 140, aligning the first sealing part 210 and the second sealing part 180 axially and positioning them opposite each other, which helps improve the accuracy of the sealing fit. At the same time, this structure also makes the installation of the valve core 200 more convenient, reduces assembly errors, improves assembly efficiency, and reduces manufacturing and maintenance costs while ensuring sealing performance.

[0107] In summary, by placing the first sealing part 210 between the second sealing part 180 and the valve cover 170, the ease of installation of the valve core 200 and the stability of the sealing structure can be improved, thereby contributing to the improvement of the overall sealing performance and structural reliability of the isolation valve 10.

[0108] According to the second aspect of this application, referring to Figure 2 , Figure 7 A fuel evaporative emission system is provided, including the isolation valve 10 in the above embodiments. This fuel evaporative emission system has all the beneficial effects of the isolation valve 10, which will not be elaborated further herein.

[0109] In some embodiments, a carbon canister 20 is included, with a first opening 120 communicating with the carbon canister 20 for guiding fuel vapor to the carbon canister 20 for adsorption, and a second opening 130 communicating with the atmosphere for introducing or discharging air during the adsorption or desorption of fuel vapor.

[0110] In some embodiments, the fuel evaporation emission system includes an ash filter 30, with a second opening 130 communicating with the ash filter 30, which is connected to the atmosphere. The ash filter 30 is disposed between the second opening 130 and the atmosphere to filter air entering the carbon canister 20 from the atmosphere, preventing particulate matter from entering the carbon canister 20 and protecting the service life and operational stability of the adsorbent material inside the carbon canister 20.

[0111] The carbon canister 20 is used to adsorb fuel vapor, the isolation valve 10 controls the opening and closing state between the carbon canister 20 and the atmosphere, and the ash filter 30 provides air purification. The three work together to help achieve a balance between fuel vapor emission control, system sealing and environmental performance.

[0112] According to a third aspect of this application, a vehicle is provided that includes the isolation valve 10 or the fuel evaporation emission system described in the above embodiments, the vehicle having all the beneficial effects of the isolation valve 10 or the fuel evaporation emission system described above, which will not be repeated here.

[0113] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0114] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0115] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0116] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An isolation valve, characterized in that, include: A valve housing having a valve cavity and a first opening and a second opening communicating with the valve cavity; and The valve core, movably disposed in the valve housing, is configured to switch between a first state and a second state under the action of an external force; Wherein, the first opening is used to communicate with the carbon canister, and when the valve core is in the first state, both the first opening and the second opening are in communication with the valve cavity; when the valve core is in the second state, the valve core blocks the first opening from communicating with the valve cavity.

2. The isolation valve according to claim 1, characterized in that, The isolation valve further includes a drive unit disposed on the valve housing, which is used to drive the valve core to switch between the first state and the second state.

3. The isolation valve according to claim 2, characterized in that, The driving component includes a moving iron core, which is movably disposed on the valve housing and connected to the valve core. The moving iron core is configured to move relative to the valve housing under the action of magnetic force, so as to drive the valve core to switch between the first state and the second state.

4. The isolation valve according to claim 3, characterized in that, The driving component also includes a coil, which is arranged around the moving iron core. When the valve core is in the first state, the moving iron core is located inside the coil. And / or, when the valve core is in the second state, at least a portion of the moving iron core is located within the valve cavity.

5. The isolation valve according to claim 3, characterized in that, The drive component also includes a stationary iron core, which is disposed on the valve housing and located on the side of the moving iron core away from the valve cavity.

6. The isolation valve according to claim 5, characterized in that, When the valve core is in the first state, the moving iron core and the stationary iron core are separated. And / or, when the valve core is in the second state, the moving iron core and the stationary iron core are attracted together.

7. The isolation valve according to any one of claims 1-6, characterized in that, The isolation valve further includes a buffer element disposed on the movement path of the valve core to buffer the valve core during the switching process from the second state to the first state.

8. The isolation valve according to claim 7, characterized in that, The buffer includes an elastic portion. When the valve core is in the first state, at least a portion of the valve core contacts the elastic portion to buffer the valve core.

9. The isolation valve according to any one of claims 1-6, characterized in that, The isolation valve also includes an elastic element, which is used to restore the valve core to the first state or the second state.

10. The isolation valve according to claim 9, characterized in that, When the valve core is in the second state, the elastic element is located inside the valve cavity.

11. The isolation valve according to any one of claims 1-6, characterized in that, The valve housing has a third opening that communicates with the valve cavity, and the valve housing includes a valve cover that is sealed to the third opening.

12. The isolation valve according to claim 11, characterized in that, The buffer element of the isolation valve is disposed on the valve cover.

13. The isolation valve according to any one of claims 1-6, characterized in that, The first opening communicates with the valve cavity through a first channel, the valve core includes a first sealing part, and the valve housing is provided with a second sealing part in the first channel; When the valve core is in the second state, the first sealing part and the second sealing part cooperate to close the first channel.

14. The isolation valve according to claim 13, characterized in that, During the process of the valve core switching from the first state to the second state, the first sealing part moves from the side away from the valve cavity toward the side closer to the valve cavity.

15. The isolation valve according to claim 13, characterized in that, The second sealing part includes a boss, and the first sealing part cooperates with the boss to close the first channel.

16. The isolation valve according to claim 13, characterized in that, At least one of the first sealing portion and the second sealing portion is provided with a sealing element.

17. The isolation valve according to claim 16, characterized in that, The seal is located in the first sealing part.

18. The isolation valve according to claim 16, characterized in that, The first sealing part includes an annular platform, and when the valve core is in the second state, the sealing element is located between the annular platform and the second sealing part.

19. The isolation valve according to claim 18, characterized in that, The elastic element of the isolation valve is located between the first sealing portion and the valve body, and at least a portion of the elastic element abuts against the sealing element so that the sealing element fits against the annular platform.

20. The isolation valve according to claim 13, characterized in that, The first sealing part is disposed between the second sealing part and the valve cover of the valve body.

21. A fuel evaporation emission system, characterized in that, Includes the isolation valve described in any one of claims 1-20.

22. The fuel evaporation emission system according to claim 21, characterized in that, It includes a carbon canister, with the first opening communicating with the carbon canister and the second opening communicating with the atmosphere.

23. The fuel evaporation emission system according to claim 21, characterized in that, The fuel evaporation emission system includes an ash filter, the second opening is connected to the ash filter, and the ash filter is connected to the atmosphere.

24. A vehicle, characterized in that, It includes the isolation valve as described in any one of claims 1-20, or the fuel evaporation emission system as described in any one of claims 21-23.

Images