A fuel tank isolation valve, canister assembly, and vehicle

Abstract

This invention belongs to the field of vehicle component technology, specifically referring to a fuel tank isolation valve, a charcoal canister assembly, and a vehicle. The charcoal canister assembly includes a charcoal canister and a fuel tank isolation valve. The fuel tank isolation valve includes: a valve body, the inner cavity of which is divided into a first inner cavity and a second inner cavity by a partition, the partition having an air outlet and a balance hole respectively; an air outlet control unit, disposed in the first inner cavity, capable of sealing or opening the air outlet; and a pressure relief and air replenishment unit, disposed in the second inner cavity. The pressure relief and air replenishment unit of this invention includes an air replenishment valve core, an air replenishment reset component, a pressure relief valve core, and a pressure relief reset component. The cooperation of the air replenishment valve core and the pressure relief valve core controls the opening and closing of the balance gap in the balance channel, achieving both automatic pressure relief and automatic air replenishment. It has advantages such as simple structure, convenient installation, and reasonable layout.

Description

Technical Field

[0001] This invention belongs to the field of vehicle component technology, specifically referring to a fuel tank isolation valve, a charcoal canister assembly, and a vehicle. Background Technology

[0002] The charcoal canister is a core component of gasoline-powered vehicles. Its main function is to collect and temporarily store the fuel vapors in the fuel tank, preventing them from being directly released into the atmosphere and causing pollution. When appropriate, it sends these fuel vapors into the engine for combustion, thus achieving the goals of energy conservation and environmental protection.

[0003] The fuel tank isolation valve is located between the fuel tank and the charcoal canister. It generally needs to have four functions: isolation between the fuel tank and the outside world, active venting of the fuel tank, automatic pressure relief of the fuel tank at high pressure, and automatic venting of the fuel tank at low pressure.

[0004] Prior art document CN113915031B discloses a fuel tank isolation valve, which includes a housing, an electromagnetic coil assembly, a valve head assembly, a gas replenishment and return spring, a pressure relief valve head, and a pressure relief return spring. The housing contains a first air chamber and a lower valve housing cavity, with a first opening between them. The gas replenishment and return spring acts on the valve head assembly, causing it to tend to block the first opening, thus isolating the fuel tank from the outside environment. The electromagnetic coil assembly drives the valve head assembly to open the first opening, enabling active venting of the fuel tank. When the gas pressure inside the lower valve housing cavity acts on the valve head assembly, it causes the valve head assembly and the gas replenishment and return spring to tend to open the first opening, enabling automatic gas replenishment when the fuel tank is under low pressure. The pressure relief return spring acts on the pressure relief valve head, which can block or open the gas passage, enabling automatic pressure relief from high pressure in the fuel tank.

[0005] In the above structure, the first opening is sealed by the air replenishment return spring and the valve head assembly, thus achieving both isolation and automatic air replenishment functions. When the air replenishment return spring functions as an isolation spring, within the normal range, the larger the spring constant, the better the isolation and sealing effect. When the air replenishment return spring functions as an automatic air replenishment spring, within the normal range, the smaller the spring constant, the higher the sensitivity of the air replenishment function, and the better the air replenishment effect. Because these two aspects are somewhat contradictory, the selection of the air replenishment return spring is quite difficult, and in actual use, products often experience problems such as poor air replenishment efficiency or poor isolation and sealing. Summary of the Invention

[0006] The purpose of this invention is to provide a fuel tank isolation valve, a charcoal canister assembly, and a vehicle that are simple and compact in structure, have good sealing performance, long service life, and high control precision.

[0007] The objective of this invention is achieved as follows:

[0008] A fuel tank isolation valve includes: a valve body, the inner cavity of which is divided into a first inner cavity and a second inner cavity by a partition, the partition having at least one vent hole and a balance hole communicating with the first inner cavity and the second inner cavity respectively; a fuel tank connector communicating with the first inner cavity and a charcoal canister connector communicating with the second inner cavity respectively; a vent control unit disposed in the first inner cavity, capable of sealing or opening the vent hole; and a pressure relief and air replenishment unit disposed in the second inner cavity; wherein, an inner mounting portion and an outer mounting portion corresponding to the position of the balance hole are disposed on the partition side facing the second inner cavity; the pressure relief and air replenishment unit includes:

[0009] An air replenishment valve core is movably mounted on the inner mounting part, forming a balance channel between the balance hole, the inner mounting part, the air replenishment valve core, and the outer mounting part. One end of this balance channel connects to the first inner cavity through the balance hole, and the other end connects to the second inner cavity through the balance gap between the outer mounting part and the air replenishment valve core. An air replenishment reset component is disposed between the air replenishment valve core and the partition. A pressure relief valve core is capable of sealing or opening the balance gap. A pressure relief reset component is disposed between the pressure relief valve core and the valve body. When the pressure in the first inner cavity is greater than the pressure relief threshold, the pressure relief valve core and the pressure relief reset component can be automatically compressed, and the balance gap can be opened, thereby achieving automatic pressure relief. When the pressure in the first inner cavity is less than the air replenishment threshold, the air replenishment reset component of the air replenishment valve core can be automatically compressed, and the balance gap can be opened, thereby achieving automatic air replenishment.

[0010] The tank isolation valve of the present invention also has the following features: an air outlet is located in the middle of the partition, and several balance holes are located on the outer periphery of the air outlet; the inner mounting part is an inner annular protrusion located on the inner periphery of the balance holes, and an air supply sealing ring is provided between the annular protrusion and the air supply valve core; the outer mounting part is an outer annular protrusion located on the outer periphery of the balance holes; the pressure relief reset component can seal the pressure relief valve core against the outer annular protrusion; the air supply reset component can seal the air supply valve core against the pressure relief valve core, thereby sealing the balance gap.

[0011] The oil tank isolation valve of the present invention also has the following features, wherein the pressure relief valve core has an annular pressure relief body and a sealing gasket, the outer edge of the annular pressure relief body is bent to one side to form an outer limiting part, and a sealing gasket is installed inside the outer limiting part; the inner edge of the annular pressure relief body is bent to the other side to form an inner limiting part, and the inner limiting part is used to fit the pressure relief reset component.

[0012] The tank isolation valve of the present invention also has the following feature: the abutting end of the outer mounting portion extends out of the outer end face of the inner mounting portion; when the pressure relief valve core abuts against the abutting end of the outer mounting portion, the air replenishment valve core can move between the pressure relief valve core and the partition portion, and can automatically open the balance gap when replenishing air.

[0013] The tank isolation valve of the present invention also has the following features, wherein the air replenishment valve core has: an annular air replenishment body for being movably disposed on the outer side wall of the inner mounting portion; an annular abutment portion extending radially to the outer end of the annular air replenishment body and forming a balance gap together with the outer mounting portion; and a reset member mounting portion disposed on the inner side of the annular abutment portion, the inner cavity of which is used to mount the air replenishment reset member; and an air outlet communicating with a second inner cavity through the inner cavity of the reset member mounting portion.

[0014] The oil tank isolation valve of the present invention also has the following feature: a pressure relief valve core is provided on the outer side of the reset member mounting part, and a gas replenishment passage is formed between the pressure relief valve core and the pressure relief valve core. When the gas replenishment valve core is opened, the gas in the second inner cavity enters the first inner cavity in sequence through the gas replenishment passage and the balance channel.

[0015] The oil tank isolation valve of the present invention also has the following features, wherein the valve body has a first valve body, a second valve body and a third valve body, an exhaust control unit is installed in the first valve body, a first inner cavity is formed between the first valve body and the second valve body, and a second inner cavity is formed between the second valve body and the third valve body; a partition and an oil tank connector are formed on the second valve body; and a charcoal canister connector is formed on the third valve body.

[0016] The oil tank isolation valve of the present invention also has the following features: the vent control unit includes a driver, a control spring, and a sealing plug; the outer end of the valve stem of the driver is provided with a sealing plug; the control spring is sleeved on the outside of the valve stem and abuts against the driver and the sealing plug, for driving the sealing plug to seal the vent hole; the sealing plug has a plug body and a valve stem mounting part provided on one side of the plug body; the side wall of the plug body is provided with an annular material reduction groove; the inner wall of the first inner cavity is also provided with a plurality of first guide protrusions for sliding guidance of the plug body.

[0017] A charcoal canister assembly includes: a charcoal canister having a charcoal canister shell and at least one set of oil and gas adsorption devices located in the inner cavity of the charcoal canister shell, the charcoal canister shell having an isolation valve connector communicating with its own inner cavity and an exhaust connector; and a fuel tank isolation valve having a valve body and a fuel tank connector and a charcoal canister connector disposed on the valve body, the charcoal canister connector being connected to the isolation valve connector via a connecting pipeline; wherein, the fuel tank isolation valve is the aforementioned fuel tank isolation valve.

[0018] A vehicle includes the aforementioned charcoal canister assembly, wherein the charcoal canister shell has a first chamber and a second chamber, one end of which is connected to the other; the other end of the first chamber is provided with an isolation valve connector and a desorption connector communicating with the first chamber; the other end of the second chamber is provided with an exhaust connector communicating with the second chamber; and both the first and second chambers are provided with oil and gas adsorption devices.

[0019] The outstanding and beneficial technical effects of this invention compared to the prior art are:

[0020] 1. This invention controls the opening and closing of the balance gap of the balance channel by cooperating with the air replenishment valve core and the pressure relief valve core, which can realize both automatic pressure relief and automatic air replenishment. It has the advantages of simple structure, convenient installation and reasonable layout.

[0021] 2. The outer edge of the annular pressure relief body of the present invention is bent to one side to form an outer limiting part for installing a sealing gasket, and its inner edge is bent to the other side to form an inner limiting part for installing a pressure relief reset component. This structure can reduce the axial dimension of the pressure relief valve core and achieve miniaturization.

[0022] 3. The air replenishment valve core of the present invention has an annular air replenishment body for guidance, an annular abutment part for sealing, and a reset part for installing the air replenishment reset part, which has the advantages of simple structure and stable and convenient installation.

[0023] 4. The air outlet control unit of the present invention independently controls the opening and closing of the air outlet. Within the range allowed by the driver, the elastic coefficient of the control spring can be increased to increase the sealing performance of the sealing plug. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the carbon canister assembly of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the oil tank isolation valve of the present invention.

[0026] Figure 3 This is a cross-sectional view of the oil tank isolation valve in the isolated state of the present invention.

[0027] Figure 4 This is one of the exploded views of the oil tank isolation valve of the present invention.

[0028] Figure 5 This is the second exploded view of the oil tank isolation valve of the present invention.

[0029] Figure 6 This is one of the structural schematic diagrams of the second valve body of the present invention.

[0030] Figure 7 This is the second schematic diagram of the structure of the second valve body of the present invention.

[0031] Figure 8 This is a cross-sectional view of the oil tank isolation valve under active venting conditions according to the present invention.

[0032] Figure 9 This is a cross-sectional view of the oil tank isolation valve under automatic pressure relief conditions according to the present invention.

[0033] Figure 10 This is a cross-sectional view of the oil tank isolation valve under the automatic air replenishment state of the present invention.

[0034] Figure 11This is an exploded view of the charcoal canister of the present invention.

[0035] Figure 12 This is a cross-sectional view of the charcoal canister assembly of the present invention.

[0036] Figure 13 yes Figure 12 Cross-sectional view of the carbon canister assembly at point AA.

[0037] Figure 14 This is a cross-sectional view of the main shell of the charcoal canister of the present invention.

[0038] Figure 15 This is a schematic diagram of the internal structure of the main shell of the charcoal canister of the present invention.

[0039] The meaning of the labels in the diagram:

[0040] 1. Fuel tank isolation valve; 2. Carbon canister; 3. Connecting pipeline;

[0041] Valve body 11; First valve body 11a; Second valve body 11b; Third valve body 11c; First inner cavity 111; First guide protrusion 1111; Second inner cavity 112; Second guide protrusion 1121; Separator 113; Air outlet 1131; Balance hole 1132; Inner mounting part 1133; Outer mounting part 1134; Outer protrusion 1135; Guide protrusion mounting groove 1136; Third guide protrusion 1137; Oil tank connector 114; Charcoal canister connector 115; Fixed support leg 116; Air outlet control unit 12; Driver 121; Valve stem 1211; Control spring 122; Sealing plug 123; Plug body 1231; Valve stem mounting part 1232; Annular material reduction groove 1233; Spring mounting seat 124; Pressure relief and air replenishment unit 13; Air replenishment valve core 131; Annular air replenishment body 1311; Annular abutment part 1312; Reset part mounting part 1313; Air replenishment reset part 132; Pressure relief valve core 133; Annular pressure relief body 1331; Outer limiting part 1331a; Inner limiting part 1331b; Annular reinforcing part 1331c; Sealing gasket 1332; Pressure relief reset part 134; Balance gap 135; Air replenishment sealing ring 136; Air replenishment passage 137; Pressure relief gap 138;

[0042] 21. Carbon canister shell; 21a. Main shell; 21b. Bottom cover; 21c. First top cover; 21d. Second top cover; 211. Isolation valve connector; 212. Exhaust connector; 213. First chamber; 2131. Air inlet area; 2132. Desorption area; 2133. Air inlet; 2134. Desorption port; 214. Second chamber; 2141. Exhaust port; 215. Blocking part; 216. Desorption connector; 217. Spacer protrusion; 218. Partition plate; 219. Mounting support; 22. Oil and gas adsorption device; 221. Carbon core; 222. Adsorption bracket; 223. Bracket pusher; 224. First carbon core covering; 225. Second carbon core covering; 23. Threaded column; 24. Support column.

[0043] Clamp 31. Detailed Implementation

[0044] The present invention will be further described below with reference to specific embodiments:

[0045] like Figure 1 As shown, a charcoal canister assembly for use in a vehicle, used to connect to a fuel tank, includes a fuel tank isolation valve 1, a charcoal canister 2, and a connecting pipe 3. The fuel tank isolation valve 1 is connected to the charcoal canister 2 through the connecting pipe 3.

[0046] like Figure 2 , 3 As shown in Figure 4, the oil tank isolation valve 1 includes a valve body 11, an air outlet control unit 12, and a pressure relief and air replenishment unit 13.

[0047] The inner cavity of the valve body 11 is divided into a first inner cavity 111 and a second inner cavity 112 by a partition 113. At least one air outlet 1131 and a balance hole 1132 are respectively provided on the partition 113 to connect the first inner cavity 111 and the second inner cavity 112. The valve body 11 is provided with an oil tank connector 114 connecting the first inner cavity 111 and a charcoal canister connector 115 connecting the second inner cavity 112. The oil tank connector 114 can be connected to the oil tank through a pipeline, and the charcoal canister connector 115 is connected to the charcoal canister 2 through a connecting pipeline 3.

[0048] Specifically, the valve body 11 has a first valve body 11a, a second valve body 11b and a third valve body 11c, which are fixed together in sequence by welding, threaded connection, screw connection and other methods, so that a first inner cavity 111 is formed between the first valve body 11a and the second valve body 11b, and a second inner cavity 112 is formed between the second valve body 11b and the third valve body 11c.

[0049] like Figure 4 , 5 As shown, in this embodiment, the main bodies of the first valve body 11a and the second valve body 11b are generally cylindrical. One end of the main body of the first valve body 11a is open and forms a first welding ring. One end of the main body of the second valve body 11b forms a first welding end that matches the outer diameter of the first welding ring. The first welding end is sleeved on the outside of the first welding ring and welded and fixed.

[0050] like Figure 6 As shown, the main body sidewall of the second valve body 11b is formed with an oil tank connector 114 that communicates with the first inner cavity 111. The other end of the main body of the second valve body 11b is formed with a partition 113. The partition 113 is located on the side of the first inner cavity 111 and is a flat surface. At least one air outlet 1131 is provided in the middle of the flat surface. Several balance holes 113 are evenly distributed on the outer periphery of the air outlet 1131. In this embodiment, there is one air outlet 1131 and eight balance holes 113 distributed in a circle.

[0051] like Figure 7 As shown, the partition 113 extends to the side of the second inner cavity 112 and is provided with a second welding end. (As shown...) Figure 3 and 5 As shown, a second welding ring is formed on the third valve body 11c, which is adapted to the second welding end. The second welding ring is inserted into the second welding end and welded and fixed. A bent charcoal canister connector 115 is formed on the third valve body 11c. The end of the charcoal canister connector 115 is provided with an anti-detachment protrusion. When the charcoal canister connector 115 is inserted into the end of the connecting pipe 3, a clamp 31 is fixed on the outside of the connecting pipe 3.

[0052] like Figure 3 , 4 As shown in Figure 5, the exhaust control unit 12 is located in the first inner cavity 111 and can seal or open the exhaust port 1131 to realize the isolation function of the oil tank isolation valve and the active exhaust function of the oil tank.

[0053] Specifically, an exhaust control unit 12 is installed inside the first valve body 11a. The exhaust control unit 12 includes an actuator 121, a control spring 122, and a sealing plug 123. The actuator 121 is preferably a solenoid valve assembly located inside the first valve body 11a. The end of the valve stem 1211 of the actuator 121 extends into the inner cavity of the second valve body 11b and is provided with a sealing plug 123. The sealing plug 123 has a plug body 1231 and a valve stem mounting part 1232 provided on one side of the plug body 1231. A valve stem locking groove is radially provided on the valve stem mounting part 1232. A locking block is provided at the outer end of the valve stem 1211. The locking block is radially locked into the valve stem locking groove to ensure the relative fixation of the axial positions of the two. The control spring 122 is fitted on the outside of the valve stem 1211 and abuts against the actuator 121 and the sealing plug 123. It is used to drive the sealing plug 123 to abut against the flat surface and seal the vent 1131, thereby achieving the sealing of the oil tank and realizing the isolation function of the oil tank isolation valve 1. When the control actuator 121 controls the sealing plug 123 to open the vent 1131, the active venting function of the oil tank can be realized.

[0054] Preferably, the side wall of the plug body 1231 is provided with an annular material reduction groove 1233 to reduce the weight of the plug body 1231 and reduce production costs. The outer diameter of the plug body 1231 is larger than the outer diameter of the valve stem mounting part 1232. The edge of the plug body 1231 near the actuator 121 is provided with a flange for mounting the control spring 122. One end of the control spring 122 is installed inside the flange to prevent the control spring 122 from being misaligned.

[0055] like Figure 4As shown, the other end of the control spring 122 can also abut against the driver 121 via a spring mounting seat 124. The spring mounting seat 124 has an annular body, and the end face of the annular body is formed with an inner convex ring portion and an outer convex ring portion. A control spring mounting position for mounting the control spring 122 is formed between the inner convex ring portion and the outer convex ring portion. The other end of the control spring 122 is mounted in the control spring mounting position. In addition, the spring mounting seat 124 can limit the extension distance of the valve stem 1211.

[0056] like Figure 6 As shown, the inner wall of the first inner cavity 111 is also provided with a plurality of first guide protrusions 1111 for sliding guidance of the plug body 1231. In this embodiment, the first guide protrusions 1111 are circumferentially arranged on the inner wall of the second valve body 11b. Within the moving area of ​​the plug body 1231, the size of the first guide protrusions 1111 is adapted to the outer diameter of the plug body 1231, which can guide the sealing plug 123 to seal the vent hole 1131, reduce the positional deviation of the sealing plug 123, and ensure the sealing performance. In addition, the outer diameter of the plug body 1231 is smaller than the diameter of the distribution of the balance holes 113, so the plug body 1231 will not interfere with the balance holes 113. At the same time, the gaps between the first guide protrusions 1111 can also form to connect the balance holes 113, which facilitates the entry and exit of gas in the first inner cavity 111 through the balance holes 113. At the same time, the first guide protrusions 1111 can also strengthen the structural strength of the second valve body 11b.

[0057] like Figure 3 As shown, the pressure relief and air replenishment unit 13 is installed in the second inner cavity 112 to realize the automatic pressure relief function of the high pressure of the oil tank and the automatic air replenishment function of the low pressure of the oil tank.

[0058] Specifically, such as Figure 7 As shown, an inner mounting portion 1133 and an outer mounting portion 1134 corresponding to the position of the balance hole 1132 are provided on one side wall of the partition portion 113 facing the second inner cavity 112. The inner mounting portion 1133 is an inner annular protrusion located on the inner periphery of the balance hole 1132, and an air outlet 1131 is formed inside the inner annular protrusion. The outer mounting portion 1134 is an outer annular protrusion located on the outer periphery of the balance hole 1132, and a first annular sealing protrusion that contacts the pressure relief valve core 133 is formed on the sealing surface of the outer annular protrusion. The space formed between the inner mounting portion 1133 and the outer mounting portion 1134 can connect all the balance holes 1132.

[0059] like Figure 3 , 4 As shown in Figure 5, the pressure relief and air replenishment unit 13 includes an air replenishment valve core 131, an air replenishment reset component 132, a pressure relief valve core 133, and a pressure relief reset component 134.

[0060] Specifically, the air replenishment valve core 131 is movably mounted on the inner mounting portion 1133, forming a balance channel between the balance hole 1132, the inner mounting portion 1133, the air replenishment valve core 131, and the outer mounting portion 1134. One end of this balance channel connects to the first inner cavity 111 through the balance hole 1132, and the other end of this balance channel connects to the second inner cavity 112 through the balance gap 135 between the outer mounting portion 1134 and the air replenishment valve core 131. The air replenishment reset member 132 is disposed between the air replenishment valve core 131 and the partition portion 113, causing the air replenishment valve core 131 to move away from the partition portion 113.

[0061] The pressure relief valve core 133 can abut against the air supply valve core 131 and the external mounting part 1134, and can seal or open the balance gap 135; the pressure relief reset member 134 is disposed between the pressure relief valve core 133 and the third valve body 11c, and is used to drive the pressure relief valve core 133 to seal the balance gap 135.

[0062] When the pressure in the first inner cavity 111 exceeds the pressure relief threshold, the tank isolation valve 1 automatically compresses the pressure relief valve core 133 and the pressure relief reset component 134, and opens the balance gap 135, thereby achieving automatic pressure relief. When the pressure in the first inner cavity 111 is less than the air replenishment threshold, the tank isolation valve 1 automatically compresses the air replenishment reset component 132 of the air replenishment valve core 131, and opens the balance gap 135, thereby achieving automatic air replenishment. In this embodiment, the opening and closing of the balance gap 135 of the balance channel is controlled by the cooperation of the air replenishment valve core 131 and the pressure relief valve core 133, which can achieve both automatic pressure relief and automatic air replenishment. It has the advantages of simple structure, convenient installation, and reasonable layout. Meanwhile, when the pressure relief balance gap 135 is sealed, the air supply valve core assembly (air supply valve core 131 and air supply reset component 132) and the pressure relief valve core assembly (pressure relief valve core 133 and pressure relief reset component 134) interact with each other, resulting in better sealing. When the air supply valve core assembly is opened, the pressure relief valve core assembly is limited by the external mounting part 1134, preventing interference between the two, thereby improving the sensitivity of the air supply valve core assembly.

[0063] Specifically, such as Figure 3 , 4 As shown, the air replenishment valve core 131 has an integrally formed annular air replenishment body 1311, an annular abutment part 1312, and a reset part mounting part 1313.

[0064] The annular air-injection body 1311 is movably mounted on the outer side wall of the inner mounting part 1133, and an air-injection sealing ring 136 is provided between it and the inner mounting part 1133. Preferably, a sealing groove is provided on the outer side wall of the inner mounting part 1133, and the air-injection sealing ring 136 is provided in the sealing groove.

[0065] An annular abutment portion 1312 extends radially to the outer end of the annular air supply body 1311 and forms a balance gap 135 together with the outer mounting portion 1134. In this embodiment, the inner diameter of the annular abutment portion 1312 is smaller than the inner diameter of the annular air supply body 1311, such that the inner end sidewall of the annular abutment portion 1312 corresponds to the outer end face of the inner mounting portion 1133; the outer diameter of the annular abutment portion 1312 is larger than the outer diameter of the annular air supply body 1311, and a second annular sealing protrusion that contacts the pressure relief valve core 133 extends from the side end face of the annular abutment portion 1312.

[0066] The reset component mounting portion 1313 is located on one side of the inner end of the annular abutment portion 1312 and extends away from the annular air supply body 1311. Its inner cavity is used to install the air supply reset component 132 and to conduct the air outlet 1131, so that the air outlet 1131 communicates with the second inner cavity 112 through the inner cavity of the reset component mounting portion 1313. In this embodiment, the air supply reset component 132 is preferably a spring, and spring mounting positions are provided in both the reset component mounting portion 1313 and the inner mounting portion 1133.

[0067] like Figure 3 , 4 As shown, the pressure relief valve core 133 has an annular pressure relief body 1331 and a sealing gasket 1332. The outer edge of the annular pressure relief body 1331 is bent to one side to form an outer limiting portion 1331a, and the sealing gasket 1332 is installed inside the outer limiting portion 1331a. The inner edge of the annular pressure relief body 1331 is bent to the other side to form an inner limiting portion 1331b, which is used to mount the pressure relief reset member 134. The above structure can reduce the axial dimension of the pressure relief valve core 133 and achieve miniaturization. The pressure relief reset member 134 is preferably a spring, with one end abutting against the annular pressure relief body 1331 and the other end abutting against the third valve body 11c. The pressure relief reset member 134 can seal the pressure relief valve core 133 against the first annular sealing protrusion of the outer mounting portion 1134. At this time, the air replenishment reset component 132 can seal the air replenishment valve core 131 against the pressure relief valve core 133, thereby sealing the balance gap 135.

[0068] Preferably, the annular pressure relief body 1331 is a metal stamping part, and an annular reinforcing part 1331c is formed by protrusion in the middle of the annular pressure relief body 1331 to increase its own strength.

[0069] To facilitate the movement of the air replenishment valve core 131, the abutting end of the outer mounting portion 1134 (i.e. the outer end of the first annular sealing protrusion) extends out of the outer end face of the inner mounting portion 1133 in the axial projection direction. When the pressure relief valve core 133 abuts against the abutting end of the outer mounting portion 1134, the air replenishment valve core 131 can move between the pressure relief valve core 133 and the partition portion 113, thereby automatically opening the balance gap 135 during air replenishment.

[0070] Preferably, such as Figure 7 As shown, the inner wall of the outer mounting portion 1134 extends with evenly distributed protrusions 1135, forming a ventilation space between the protrusions 1135. One end of the ventilation space is connected to the balance hole 1132, and the other end is connected to the balance gap 135, thereby ensuring the conductivity of the balance channel. In another embodiment, the protrusions 1135 can contact the outer periphery of the air supply valve core 131, playing a certain guiding role.

[0071] In another embodiment, such as Figure 3 As shown in Figure 5, the inner wall of the second inner cavity 112 is further provided with several second guide protrusions 1121 for sliding guidance of the pressure relief valve core 133. Specifically, five second guide protrusions 1121 are circumferentially provided on the inner wall of the second welded ring portion of the third valve body 11c, and a pressure relief gap 138 is provided between the second guide protrusions 1121. When the pressure relief valve core 133 is opened, the pressure relief gap 138 can conduct the balance channel and the second inner cavity 112. Preferably, the end of the second guide protrusion 1121 extends out of the second welded ring portion, and a guide protrusion mounting groove 1136 is provided between the second welded end of the second valve body 11b and the outer mounting portion 1134. When the second welded ring portion of the third valve body 11c is installed on the second welded end of the second valve body 11b, the end of the second guide protrusion 1121 is engaged in the guide protrusion mounting groove 1136.

[0072] Preferably, such as Figure 3 As shown in Figure 7, a third guide protrusion 1137 is also provided on the inner side of the guide protrusion mounting groove 1136. The inner diameter of the third guide protrusion 1137 is the same as that of the second guide protrusion 1121, and they are staggered and have overlapping parts on the axial projection plane. The third guide protrusion 1137 can work with the second guide protrusion 1121 to guide the sliding of the pressure relief valve core 133, and also facilitates the positioning of the pressure relief valve core 133 during assembly.

[0073] Preferably, a pressure relief valve core 133 is provided on the outer side of the reset component mounting portion 1313, and an air supply passage 137 is formed between the pressure relief valve core 133 and the reset component mounting portion 1313, such as Figure 4 As shown, the air supply passage 137 is preferably provided with a plurality of air supply grooves on the outer side wall of the reset component mounting part 1313 in a circumferential direction, or the air supply passage 137 is the air supply gap between the reset component mounting part 1313 and the pressure relief valve core 133.

[0074] Preferably, the outer diameter of the reset mounting part 1313 and the inner diameter of the inner limiting part 1331b of the pressure relief valve core 133 are the same, and the axial length of the reset mounting part 1313 is greater than the axial length of the inner limiting part 1331b. When the air supply valve core 131 moves axially, the reset mounting part 1313 is always located inside the inner limiting part 1331b, so that the inner limiting part 1331b has a certain guiding and fixing function.

[0075] In summary, the oil tank isolation valve 1 of this embodiment has four functions: isolating the oil tank from the outside world, actively venting the oil tank, automatically depressurizing the high pressure of the oil tank, and automatically replenishing the low pressure of the oil tank.

[0076] The fuel tank's isolation function from the outside world: such as Figure 3 As shown, when no external force is applied, the control spring 122 drives the sealing plug 123 to seal the vent 1131; at the same time, the pressure relief and air replenishment unit 13 seals the balance channel, thereby isolating the channel between the first inner cavity 111 and the second inner cavity 112, that is, isolating the channel between the oil tank and the charcoal canister 2.

[0077] Fuel tank active venting function: such as Figure 8 As shown, when active venting is required, such as when refueling the fuel tank, the active venting control unit 12 opens, thereby opening the vent hole 1131 of the sealing plug 123. This allows the fuel tank's fuel vapor to be discharged sequentially through the fuel tank connector 114, the first inner cavity 111, the vent hole 1131, the second inner cavity 112, the charcoal canister connector 115, and the charcoal canister 2, thus realizing the active venting function of the fuel tank.

[0078] Automatic pressure relief function for high-pressure fuel tank: such as Figure 9 As shown, when the oil tank generates high pressure under high temperature and other environments, and the pressure in the first inner cavity exceeds the pressure relief threshold, the pressure relief valve core 133 moves against the elastic force of the pressure relief reset component 134, opening the balance gap 135 of the balance channel. At the same time, the air replenishment valve core 131 can move under the action of the air replenishment reset component 132, thereby opening the balance channel, so that the oil and gas in the oil tank can be discharged sequentially through the oil tank connector 114, the first inner cavity 111, the balance channel (i.e., the balance hole 1132 and the balance gap 135), the pressure relief gap 138, the second inner cavity 112, the charcoal canister connector 115, and the charcoal canister 2, realizing the automatic pressure relief function of the oil tank.

[0079] Automatic low-pressure air replenishment function for fuel tank: such as Figure 10 As shown, when the oil tank generates negative pressure and the pressure in the first inner cavity is less than the air replenishment threshold, the air replenishment valve core 131 moves against the elastic force of the air replenishment reset member 132, opening the balance gap 135 of the balance channel, so that the gas in the charcoal canister 2 can enter the oil tank in sequence through the charcoal canister connector 115, the second inner cavity 112, the air replenishment passage 137, the balance channel (i.e., the balance gap 135 and the balance hole 1132), the first inner cavity 111, and the oil tank connector 114, thereby realizing the automatic air replenishment function.

[0080] like Figure 1 As shown, in this embodiment, the fuel tank isolation valve 1 is directly fixed to the charcoal canister shell 21 of the charcoal canister 2. Specifically, as... Figure 11As shown, several threaded posts 23 and support posts 24 are provided on the side wall of the charcoal canister shell 21. The valve body 11 of the oil tank isolation valve 1 is provided with a fixed support foot 116. The fixed support foot 116 is provided with a through hole. Fasteners (preferably screws) pass through the through hole to fix the oil tank isolation valve 1 to the charcoal canister shell 21. The support posts 24 are used to support the valve body 11 in other parts.

[0081] In this embodiment, two fixed feet 116 are provided and located on both sides of the first valve body 11a, and each fixed foot 116 is provided with a through hole. Correspondingly, the charcoal canister shell 21 is provided with two threaded posts 23 and a support post 24. The support post 24 is plate-shaped and has an arc-shaped groove at its outer end that matches the outer contour of the second valve body 11b. When the oil tank isolation valve 1 is fixed by screws, the second valve body 11b abuts against the support post 24.

[0082] In addition, a number of mounting feet 219 are formed on the charcoal canister shell 21, and the mounting feet 219 are fitted with annular inserts for fixing the charcoal canister 2 to the vehicle.

[0083] The installation position of the fuel tank isolation valve 1 needs to take into account the actual vehicle environment, that is, the force of the control spring 122 driving the sealing plug 123 to seal the air outlet 1131 should not be negatively affected by the weight of the sealing plug 123.

[0084] like Figure 3 As shown, this is the installation position of the fuel tank isolation valve 1 in a vehicle environment according to this embodiment. At this time, the direction of the force of the control spring 122 and the direction of gravity of the sealing plug 123 and other structures are perpendicular to each other and do not affect each other. At this time, without the action of external force, the sealing plug 123 can directly seal the vent 1131 under the action of the control spring 122. The sealing performance of the sealing plug 123 at the installation position of sealing the vent 1131 to the left (or right) is relatively good.

[0085] If such Figure 3 When the installation position shown is rotated 90 degrees counterclockwise, i.e., the sealing plug 123 is facing upward to seal the vent 1131, and the direction of the force of the control spring 122 is opposite to the direction of the gravity of the sealing plug 123 and other structures, the control spring 122 needs to overcome the gravity of the sealing plug 123 and other structures to seal the vent 1131. In this case, because the force of the control spring 122 is negatively affected by the gravity of the sealing plug 123, the load on the control spring 122 increases. After long-term use, the sealing performance of the vent 1131 may pose a safety hazard. Therefore, this installation method is not recommended.

[0086] Therefore, the installation position of the fuel tank isolation valve 1 should ideally ensure that the weight of the sealing plug 123 and other structures does not affect the force of the spring 122. If the weight of the sealing plug 123 and other structures can assist in achieving a sealing effect, the result is even better. Therefore, the optimal position is one where the direction of the force of the spring 122 is consistent with the direction of the weight of the sealing plug 123 and other structures, i.e., the optimal installation position is one where the sealing plug 123 seals the vent 1131 downwards. In this embodiment, the fuel tank isolation valve 1 can be pre-installed on the charcoal canister 2 according to its installation position to prevent downstream manufacturers from arbitrarily installing the fuel tank isolation valve 1 and causing unnecessary leakage risks.

[0087] like Figure 1 and 11 As shown, the charcoal canister 2 has a charcoal canister shell 21 and at least one oil and gas adsorption device 22 located in the inner cavity of the charcoal canister shell 21.

[0088] Specifically, the charcoal canister shell 21 has an isolation valve connector 211, an exhaust connector 212, and a desorption connector 216 that are connected to its own internal cavity. The isolation valve connector 211 is connected to the charcoal canister connector 115 of the fuel tank isolation valve 1 through the connecting pipe 3. The exhaust connector 212 is connected to the outside atmosphere, and the desorption connector 216 is connected to the engine.

[0089] Preferably, such as Figure 11 As shown, the charcoal canister shell 21 has a first chamber 213 and a second chamber 214 arranged laterally. The widths of the two chambers are basically the same, but the length of the first chamber 213 is longer than that of the second chamber 214, and the height of the first chamber 213 is greater than that of the second chamber 214, making the space of the first chamber 213 larger than that of the second chamber 214.

[0090] In this embodiment, the first chamber 213 and the second chamber 214 are interconnected at one end (i.e., the lower end). The other end (upper end) of the first chamber 213 is provided with an isolation valve connector 211 and a desorption connector 216 connecting the first chamber 213. The other end (upper end) of the second chamber 214 is provided with an exhaust connector 212 connecting the second chamber 214. Both the first chamber 213 and the second chamber 214 are provided with oil and gas adsorption devices 22. In this embodiment, the first chamber 213 and the second chamber 214 are connected in series, increasing the adsorption channel of the oil and gas adsorption device 22, which is beneficial for better purification of oil and gas in the fuel tank and is more environmentally friendly.

[0091] like Figure 13 As shown, preferably, the other end (upper end) of the first chamber 213 is provided with a blocking part 215 for regulating the direction of oil and gas movement. The blocking part 215 has a plate-like structure and divides the upper end of the first chamber 213 into an air intake area 2131 and a desorption area 2132. The isolation valve connector 211 is connected to the air intake area 2131, and the desorption connector 216 is connected to the desorption area 2132.

[0092] like Figure 11 , 12 As shown in Figure 13, in order to facilitate the production and manufacturing of the charcoal canister shell 21, the charcoal canister shell 21 includes a main shell 21a, a bottom cover 21b and a first top cover 21c.

[0093] The main housing 21a has a bottom-opening inner cavity. A partition plate 218 is formed in the middle of the inner cavity, dividing it into a first chamber 213 and a second chamber 214. The bottom cover 21b seals the bottom opening of the main housing 21a and forms a gap between it and the partition plate 218, connecting the first chamber 213 and the second chamber 214. An air inlet 2133 communicating with the air inlet region 2131 and a desorption port 2134 communicating with the desorption region 2132 are provided on the upper end wall of the first chamber 213.

[0094] like Figure 13 As shown, the first top cover 21c has an isolation valve connector 211 and a desorption connector 216, and is installed on the outer side of the upper end wall of the first chamber 213. At the same time, a baffle plate is also provided inside the first top cover 21c. After the first top cover 21c is welded to the main shell 21a, the interior of the first top cover 21c forms an air intake chamber and a desorption chamber through the baffle plate. The air intake chamber is connected to the isolation valve connector 211 and the air inlet 2133, so that the isolation valve connector 211 is connected to the first chamber 213 through the air intake chamber and the air inlet 2133. The desorption chamber is connected to the desorption connector 216 and the desorption port 2134, and the first chamber 213 is connected to the desorption connector 216 through the desorption port 2134 and the desorption chamber.

[0095] In another embodiment, such as Figure 14 As shown, the upper end of the second chamber 214 is provided with an exhaust port 2141 and a second top cover 21d is formed separately or integrally. An exhaust chamber communicating with the exhaust port 2141 is formed inside the second top cover 21d, and an exhaust connector 212 communicating with the exhaust chamber is provided on the second top cover 21d.

[0096] like Figure 11 , 12 As shown, the oil and gas adsorption device 22 includes a carbon core 221, an adsorption support 222, a support pusher 223, a first carbon core covering 224, and a second carbon core covering 225.

[0097] Specifically, a second carbon core covering 225, a carbon core 221, an adsorption support 222, and a support pushing member 223 are sequentially arranged in the first chamber 213 or the second chamber 214. The carbon core 221 is composed of carbon powder, which is gradually consumed during use. The support pushing member 223 is preferably a spring, with one end abutting against the adsorption support 222 and the other end abutting against the bottom cover 21b, so that the support pushing member 223 can act on the carbon core 221 through the adsorption support 222. Under the action of the support pushing member 223, the carbon powder in the carbon core 221 can be compressed and maintain a certain density and shape, thereby ensuring the purification efficiency of the oil and gas adsorption device 22. At the same time, if the carbon powder density decreases, the internal carbon powder will collide with each other under the action of airflow, generating greater noise. Therefore, in this embodiment, the carbon core 221 can maintain a certain density, so that the carbon canister 2 has a better noise reduction effect.

[0098] In addition, the adsorption support 222 is provided with many vent holes. In order to prevent carbon powder from clogging the vent holes, a first carbon core covering 224 is provided between the carbon core 221 and the adsorption support 222. The first carbon core covering 224 is preferably a sponge. The sponge has a certain thickness and its internal mesh is smaller than the diameter of the carbon powder, which can better prevent itself from clogging.

[0099] In another embodiment, such as Figure 15 As shown, the top inner sides of the first chamber 213 and the second chamber 214 are provided with a plurality of spaced protrusions 217. The lower surfaces of the spaced protrusions 217 are of the same height and are used to abut against the upper end of the carbon core 221. At the same time, gas flow gaps are formed between the spaced protrusions 217. The gas flow gap in the air intake area 2131 of the first chamber 213 is connected to the air inlet 2133, the gas flow gap in the desorption area 2132 of the first chamber 213 is connected to the desorption port 2134, and the gas flow gap in the second chamber 214 is connected to the exhaust port 2141. Preferably, the spaced protrusions 217 are elongated and circumferentially distributed at the corresponding opening positions (air inlet 2133, desorption port 2134, exhaust port 2141), thereby forming circumferentially arranged gas flow gaps, which helps to reduce gas flow resistance.

[0100] A second carbon core covering 225 is disposed between several spaced protrusions 217 and the carbon core 221. The second carbon core covering 225 is preferably a non-woven fabric. In this embodiment, two second carbon core coverings 225 are disposed in the first chamber 213, respectively located in the air intake area 2131 and the desorption area 2132 on both sides of the blocking part 215; one second carbon core covering 225 is disposed in the second chamber 214.

[0101] like Figure 12 , 13As shown, when the fuel tank is venting, the fuel gas discharged from the fuel tank enters the first chamber 213 sequentially through the isolation valve connector 211, the intake chamber, and the intake port 2133. After being purified by the fuel gas adsorption device 22 in the first chamber 213 and the fuel gas adsorption device 22 in the second chamber 214, the clean air is discharged to the atmosphere from the exhaust port 2141, the exhaust chamber, and the exhaust connector 212. At the same time, some of the fuel gas in the first chamber 213 can enter the engine through the desorption area 2132, the desorption port 2134, the desorption chamber, and the desorption connector 216.

[0102] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An oil tank isolation valve, characterized by The valve body (11) is divided into a first inner cavity (111) and a second inner cavity (112) by a partition (113), and at least one gas outlet hole (1131) and a balance hole (1132) are formed in the partition (113) and communicate with the first inner cavity (111) and the second inner cavity (112), respectively; an oil tank joint (114) is arranged on the valve body (11) and communicates with the first inner cavity (111), and a carbon canister joint (115) is arranged on the valve body (11) and communicates with the second inner cavity (112); a gas outlet control unit (12) is arranged in the first inner cavity (111) and can seal or open the gas outlet hole (1131); and a pressure relief and air supplement unit (13) is arranged in the second inner cavity (112); wherein the partition (113) side facing the second inner cavity (112) is provided with an inner mounting portion (1133) corresponding to the position of the balance hole (1132) and an outer mounting portion (1134); the pressure relief and air supplement unit (13) comprises: an air supplement valve core (131) movably arranged on the inner mounting portion (1133), so that a balance channel is formed among the balance hole (1132), the inner mounting portion (1133), the air supplement valve core (131) and the outer mounting portion (1134), one end of the balance channel communicates with the first inner cavity (111) through the balance hole (1132), and the other end of the balance channel communicates with the second inner cavity (112) through a balance gap (135) between the outer mounting portion (1134) and the air supplement valve core (131); an air supplement reset member (132) arranged between the air supplement valve core (131) and the partition (113); a pressure relief valve core (133) capable of sealing or opening the balance gap (135); and a pressure relief reset member (134) arranged between the pressure relief valve core (133) and the valve body (11); when the pressure of the first inner cavity (111) is greater than a pressure relief threshold value, the pressure relief valve core (133) and the pressure relief reset member (134) can be automatically compressed, and the balance gap (135) is opened, so that automatic pressure relief is realized; when the pressure of the first inner cavity (111) is less than an air supplement threshold value, the air supplement reset member (132) of the air supplement valve core (131) can be automatically compressed, and the balance gap (135) is opened, so that automatic air supplement is realized.

2. The oil tank isolation valve according to claim 1, wherein: the gas outlet hole (1131) is located in the middle of the partition (113), and a plurality of balance holes (1132) are located on the periphery of the gas outlet hole (1131); wherein the inner mounting portion (1133) is an inner annular protrusion located on the inner periphery of the balance hole (1132), and an air supplement sealing ring (136) is arranged between the annular protrusion and the air supplement valve core (131); the outer mounting portion (1134) is an outer annular protrusion located on the outer periphery of the balance hole (1132). ​ The pressure relief reset member (134) can seal the pressure relief spool (133) against the outer annular protrusion; The air supplement reset member (132) can seal the air supplement spool (131) against the pressure relief spool (133), thereby sealing the balance gap (135).

3. The fuel tank isolation valve according to claim 2, characterized in that: wherein The pressure relief spool (133) has an annular pressure relief body (1331) and a sealing gasket (1332), the outer edge of the annular pressure relief body (1331) is bent to one side to form an outer limiting portion (1331a), and the sealing gasket (1332) is installed in the outer limiting portion (1331a); the inner edge of the annular pressure relief body (1331) is bent to the other side to form an inner limiting portion (1331b), and the inner limiting portion (1331b) is used to accommodate the pressure relief reset member (134).

4. The fuel tank isolation valve according to claim 2, characterized in that: wherein, The abutting end of the outer mounting portion (1134) extends beyond the outer end surface of the inner mounting portion (1133), and when the pressure relief spool (133) abuts against the abutting end of the outer mounting portion (1134), the air supplement spool (131) can move between the pressure relief spool (133) and the partition portion (113), thereby automatically opening the balance gap (135) during air supplement.

5. The fuel tank isolation valve according to claim 4, characterized in that: wherein, The air supplement spool (131) has: An annular air supplement body (1311) for movably setting on the outer side wall of the inner mounting portion (1133); An annular abutting portion (1312) radially extending at the outer end of the annular air supplement body (1311) and forming the balance gap (135) together with the outer mounting portion (1134); and A reset member mounting portion (1313) set on the inner side of the annular abutting portion (1312), and the inner cavity of which is used to mount the air supplement reset member (132); The gas outlet hole (1131) communicates the second inner cavity (112) through the inner cavity of the reset member mounting portion (1313).

6. The fuel tank isolation valve according to claim 5, characterized in that: wherein The outer side of the reset member mounting portion (1313) is provided with the pressure relief spool (133), and a air supplement passage (137) is formed between the reset member mounting portion (1313) and the pressure relief spool (133), When the air supplement spool (131) is opened, the gas in the second inner cavity (112) enters the first inner cavity (111) through the air supplement passage (137) and the balance passage in sequence.

7. The fuel tank isolation valve according to any one of claims 1-6, characterized in that: wherein, The valve body (11) has a first valve body (11a), a second valve body (11b) and a third valve body (11c), the air outlet control unit (12) is mounted in the first valve body (11a), the first inner cavity (111) is formed between the first valve body (11a) and the second valve body (11b), and the second inner cavity (112) is formed between the second valve body (11b) and the third valve body (11c); The second valve body (11b) is formed with a partition (113) and an oil tank joint (114), and the third valve body (11c) is formed with the carbon canister joint (115).

8. The oil tank isolation valve according to any one of claims 1-6, characterized in that: wherein The air outlet control unit (12) comprises a driver (121), a control spring (122) and a sealing plug (123), the outer end of the valve rod (1211) of the driver (121) is provided with the sealing plug (123), the control spring (122) is sleeved on the outer side of the valve rod (1211) and abuts between the driver (121) and the sealing plug (123), and is used for driving the sealing plug (123) to seal the air outlet hole (1131); The sealing plug (123) has a plug body (1231) and a valve rod mounting portion (1232) provided on one side of the plug body (1231), and an annular material reducing groove (1233) is formed in the side wall of the plug body (1231); The inner wall of the first inner cavity (111) is further provided with a plurality of first guide protrusions (1111) for sliding guidance of the plug body (1231).

9. A charcoal canister assembly characterized by, It comprises: The carbon canister (2) has a carbon canister shell (21), at least one group of oil gas adsorption devices (22) in the inner cavity of the carbon canister shell (21), an isolation valve joint (211) and an exhaust joint (212) on the carbon canister shell (21), and the isolation valve joint (211) and the exhaust joint (212) are communicated with the inner cavity of the carbon canister shell (21); and The oil tank isolation valve (1) has a valve body (11) and an oil tank joint (114) and a carbon canister joint (115) provided on the valve body (11), and the carbon canister joint (115) is connected with the isolation valve joint (211) through a connecting pipeline (3); The oil tank isolation valve (1) is the oil tank isolation valve (1) according to any one of claims 1-8.

10. A vehicle characterized by: The carbon canister assembly according to claim 9 is comprised; The carbon canister shell (21) has a first cavity (213) and a second cavity (214), and the first cavity (213) and the second cavity (214) are communicated with each other at one end; The other end of the first cavity (213) is provided with the isolation valve joint (211) communicating with the first cavity (213); The other end of the second cavity (214) is provided with the exhaust joint (212) communicating with the second cavity (214); The first cavity (213) and the second cavity (214) are both provided with the oil gas adsorption devices (22).

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