A tank isolation control device

Abstract

The utility model belongs to vehicle parts technical field, especially point to a tank isolation control device, it includes carbon can and tank isolation valve, carbon can has carbon can casing, the carbon can casing has the first chamber and the second chamber with one end mutual conduction, the other end of first chamber is provided with the isolation valve joint and the desorption joint that communicate first chamber, the other end of second chamber is provided with the exhaust joint that communicates second chamber, first chamber and second chamber all are provided with oil gas adsorption mechanism, wherein, tank isolation valve has the valve body that installs on carbon can casing and is provided with tank joint and carbon can joint on the valve body, and carbon can joint is connected isolation valve joint through the connecting pipeline, the utility model's first chamber and second chamber are equivalent to be connected together in series, increase oil gas adsorption mechanism's adsorption passage, be favorable to better purify the oil gas of tank, be more environmental protection, in addition, tank isolation valve is fixed in carbon can directly, the installation of downstream manufacturer is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle parts technology, and specifically refers to a fuel tank isolation control device. 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 from the fuel tank, preventing them from being directly released into the atmosphere and causing pollution. It then sends these vapors into the engine for combustion when appropriate, achieving energy conservation and environmental protection. Currently, the purification efficiency of the charcoal canister needs further improvement.

[0003] A fuel tank isolation valve is installed between the fuel tank and the charcoal canister to control the opening and closing of the passage between them. A typical fuel tank isolation valve consists of a valve body and a solenoid valve assembly. The solenoid valve assembly includes a valve stem, a plug, and a plug spring. The valve body has a fuel tank interface, an air outlet, and a charcoal canister interface. The plug spring drives the plug to seal the air outlet, thus controlling the opening and closing of the passage between the fuel tank interface and the charcoal canister interface. The charcoal canister interface is connected to the charcoal canister via a pipeline. Generally, the fuel tank isolation valve and the charcoal canister are separate components, making the installation of the fuel tank isolation valve cumbersome.

[0004] In addition, there are certain requirements for the installation position of the fuel tank isolation valve. After the fuel tank isolation valve is installed on the vehicle, if the plug spring pushes the plug upward to seal the vent, the plug spring needs to overcome the weight of the plug to seal the vent. In addition, the up-and-down bumps of the vehicle will increase the load on the plug spring. Over time, this will lead to poor sealing performance of the vent, which will easily increase the risk of fuel tank leakage and increase the working pressure of the charcoal canister. Utility Model Content

[0005] The purpose of this invention is to provide an oil tank isolation control device that is simple in structure, easy to install, has good sealing performance, and good purification effect.

[0006] The purpose of this utility model is achieved as follows:

[0007] A fuel tank isolation control device includes a charcoal canister and a fuel tank isolation valve fixed on the charcoal canister; wherein the charcoal canister has a charcoal canister shell, the charcoal canister shell has a first chamber and a second chamber that are interconnected at one end, 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; both the first chamber and the second chamber are provided with oil and gas adsorption mechanisms; wherein the fuel tank isolation valve has a valve body installed on the charcoal canister shell and a fuel tank connector and a charcoal canister connector provided on the valve body, the charcoal canister connector being connected to the isolation valve connector through a connecting pipeline.

[0008] The oil tank isolation control device of this utility model also has the following features: a plurality of threaded posts are provided on the charcoal canister shell; a fixed support foot is provided on the valve body, and a corresponding through hole is provided on the fixed support foot; a fastener is inserted in the through hole, and the fastener is fixedly connected to the threaded post to fix the valve body on the charcoal canister shell.

[0009] The oil tank isolation control device of this utility model also has the following feature: at least one support column is provided on the carbon canister shell, and the end of the support column is provided with an arc-shaped groove that matches the outer contour of the valve body. When the valve body is fixed, the valve body abuts against the arc-shaped groove of the support column.

[0010] The oil tank isolation control device of this utility model also has the following feature, wherein the oil and gas adsorption mechanism includes:

[0011] A carbon core is installed in the first chamber or the second chamber; an adsorption support is located below the first chamber or the second chamber; and a support pusher is used to compress the carbon core through the adsorption support.

[0012] The oil tank isolation control device of this utility model also has the following features, wherein the oil and gas adsorption mechanism further includes: a first carbon core covering component disposed between the carbon core and the adsorption support; and a second carbon core covering component disposed between the carbon core and the first chamber or between the carbon core and the second chamber.

[0013] The fuel tank isolation control device of this utility model also has the following features: the first carbon core covering is a sponge, and the second carbon core covering is a non-woven fabric.

[0014] The oil tank isolation control device of this utility model also has the following feature: a plurality of spaced protrusions are provided on the inner side of the other end wall of the first chamber and / or the second chamber, the plurality of spaced protrusions are used to install the second carbon core covering, and gas flow gaps are formed between the spaced protrusions.

[0015] The fuel tank isolation control device of this utility model also has the following features, wherein the charcoal canister shell includes: a main shell having an inner cavity with a bottom opening, a partition plate formed in the middle of the inner cavity dividing it into a first chamber and a second chamber; a bottom cover sealing the bottom opening of the main shell and forming a gap between it and the partition plate to communicate between the first chamber and the second chamber; a first top cover having an isolation valve connector and a desorption connector, and installed on the outer side of the other end wall of the first chamber; wherein the other end wall of the first chamber has an air inlet and a desorption port; the isolation valve connector is connected to the first chamber through the air inlet, and the first chamber is connected to the desorption connector through the desorption port.

[0016] The oil tank isolation control device of this utility model also has the following features: a blocking part is provided at the other end of the first chamber, which divides it into an air intake area and a desorption area; the isolation valve connector is connected to the air intake area; and the desorption connector is connected to the desorption area.

[0017] The fuel tank isolation control device of this utility model also has the following features: the inner cavity of the valve body is divided into a first inner cavity and a second inner cavity by a partition, and at least one vent hole connecting the first inner cavity and the second inner cavity is opened on the partition. The valve body is respectively provided with a fuel tank connector connecting the first inner cavity and a charcoal canister connector connecting the second inner cavity. A vent control unit capable of sealing or opening the vent hole is provided in the first inner cavity. 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 to drive the sealing plug to seal the vent hole. When the fuel tank isolation control device is installed on a vehicle, the force of the control spring driving the sealing plug to seal the vent hole is not negatively affected by the weight of the sealing plug.

[0018] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0019] 1. The first chamber and the second chamber of this utility model are connected in series, which increases the adsorption channel of the oil and gas adsorption mechanism, which is conducive to better purification of oil and gas in the oil tank and is more environmentally friendly.

[0020] 2. The oil tank isolation valve of this utility model is directly fixed to the charcoal canister, which facilitates installation by downstream manufacturers. At the same time, the oil tank isolation valve can be rationally arranged on the charcoal canister according to its installation location, preventing unnecessary leakage risks caused by downstream manufacturers arbitrarily installing the oil tank isolation valve.

[0021] 3. Under the action of the support pusher, the carbon powder in the carbon core can be compressed and maintain a certain density and shape, thereby ensuring the purification efficiency of the oil and gas adsorption mechanism. 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, the carbon canister also has a good noise reduction effect.

[0022] 4. This utility model forms a gas flow gap between the interval protrusions, which serves two purposes: firstly, it is used to install the carbon core, and secondly, it helps to reduce gas flow resistance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the fuel tank isolation control device of this utility model.

[0024] Figure 2 This is a structural schematic diagram of the oil tank isolation valve of this utility model.

[0025] Figure 3 This is a cross-sectional view of the oil tank isolation valve in the isolated state of this utility model.

[0026] Figure 4 This is one of the exploded views of the oil tank isolation valve of this utility model.

[0027] Figure 5 This is the second exploded view of the oil tank isolation valve of this utility model.

[0028] Figure 6 This is one of the structural schematic diagrams of the second valve body of this utility model.

[0029] Figure 7 This is the second structural schematic diagram of the second valve body of this utility model.

[0030] Figure 8 This is a cross-sectional view of the oil tank isolation valve under active exhaust conditions of this utility model.

[0031] Figure 9 This is a cross-sectional view of the oil tank isolation valve under automatic pressure relief state of this utility model.

[0032] Figure 10 This is a cross-sectional view of the oil tank isolation valve under automatic air replenishment mode of this utility model.

[0033] Figure 11 This is an exploded view of the charcoal canister of this utility model.

[0034] Figure 12 This is a cross-sectional view of the fuel tank isolation control device of this utility model.

[0035] Figure 13 yes Figure 12 Cross-sectional view of the fuel tank isolation control device at point AA.

[0036] Figure 14 This is a cross-sectional view of the main shell of the charcoal canister of this utility model.

[0037] Figure 15 This is a schematic diagram of the internal structure of the main shell of the charcoal canister of this utility model.

[0038] The meaning of the labels in the diagram:

[0039] 1. Fuel tank isolation valve; 2. Carbon canister; 3. Connecting pipeline;

[0040] 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;

[0041] 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. Second chamber; 214. Exhaust port; 2141. Blocking part; 215. Desorption connector; 216. Spacer protrusion; 217. Divider plate; 218. Mounting support; 219. Oil and gas adsorption mechanism; 22. Carbon core; 221. Adsorption bracket; 222. Bracket pusher; 223. First carbon core covering; 224. Second carbon core covering; 225. Threaded column; 23. Support column; 24.

[0042] Clamp 31. Detailed Implementation

[0043] The present invention will be further described below with reference to specific embodiments:

[0044] like Figure 1 As shown, a fuel tank isolation control device for a vehicle is used to connect the fuel tank. It 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.

[0045] 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 mechanism 22 located in the inner cavity of the charcoal canister shell 21.

[0046] 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.

[0047] 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.

[0048] 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 an oil and gas adsorption mechanism 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 mechanism 22, which is beneficial for better purification of oil and gas in the fuel tank and is more environmentally friendly.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] like Figure 13As 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.

[0053] 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.

[0054] like Figure 11 , 12 As shown, the oil and gas adsorption mechanism 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.

[0055] Specifically, a second carbon core covering 225, a carbon core 221, an adsorption support 222, and a support pusher 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 pusher 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 pusher 223 can act on the carbon core 221 through the adsorption support 222. Under the action of the support pusher 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 mechanism 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 good quiet effect.

[0056] 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.

[0057] In another embodiment, such as Figure 15As 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.

[0058] 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.

[0059] like Figure 12 , 13 As 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 mechanism 22 in the first chamber 213 and the fuel gas adsorption mechanism 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] like Figure 4 As 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.

[0070] like Figure 6As 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] In another embodiment, such as Figure 3As 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] In summary, the oil tank isolation valve 1 in this embodiment has four functions: isolation between the oil tank and the outside world, active venting of the oil tank, automatic pressure relief of the high pressure in the oil tank, and automatic air replenishment of the low pressure in the oil tank.

[0090] The fuel tank's function of isolating it from the outside world: such as... Figure 3As 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.

[0091] 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.

[0092] 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.

[0093] 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 overcomes the elastic force of the air replenishment reset member 132 and moves to open 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.

[0094] 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 11 As 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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 is pre-arranged reasonably on the charcoal canister 2 according to its installation position, which can prevent downstream manufacturers from arbitrarily installing the fuel tank isolation valve 1 and causing unnecessary leakage risks.

[0101] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A fuel tank isolation control device, characterized in that, Includes a charcoal canister (2) and an oil tank isolation valve (1) fixed on the charcoal canister (2); The charcoal canister (2) has a charcoal canister shell (21), which has a first chamber (213) and a second chamber (214) that are connected to each other at one end. The other end of the first chamber (213) is provided with an isolation valve connector (211) and a desorption connector (216) that communicate with the first chamber (213); The other end of the second chamber (214) is provided with an exhaust connector (212) that communicates with the second chamber (214); Both the first chamber (213) and the second chamber (214) are equipped with oil and gas adsorption mechanisms (22); The oil tank isolation valve (1) has a valve body (11) installed on the charcoal canister shell (21) and an oil tank connector (114) and a charcoal canister connector (115) provided on the valve body (11). The charcoal canister connector (115) is connected to the isolation valve connector (211) through a connecting pipe (3).

2. The fuel tank isolation control device according to claim 1, characterized in that: in, The carbon canister shell (21) is provided with a plurality of threaded posts (23); The valve body (11) is provided with a fixed support foot (116), and the fixed support foot (116) is provided with a corresponding through hole; Fasteners are inserted through the through hole. After the fasteners are fixedly connected to the threaded post (23), the valve body (11) is fixed on the carbon canister shell (21).

3. The fuel tank isolation control device according to claim 2, characterized in that: in, At least one support column (24) is also provided on the carbon canister shell (21). The end of the support column (24) is provided with an arc-shaped groove that matches the outer contour of the valve body (11). When the valve body (11) is fixed, the valve body (11) abuts against the arc-shaped groove of the support column (24).

4. A fuel tank isolation control device according to claim 1, Its features are: The oil and gas adsorption mechanism (22) includes: A carbon core (221) is installed in the first chamber (213) or the second chamber (214); An adsorption support (222) is located below the first chamber (213) or the second chamber (214); and A support pusher (223) is used to compress the carbon core (221) via the adsorption support (222).

5. A fuel tank isolation control device according to claim 4, Its features are: The oil and gas adsorption mechanism (22) further includes: A first carbon core covering (224) is disposed between the carbon core (221) and the adsorption support (222); and The second carbon core covering (225) is disposed between the carbon core (221) and the first chamber (213) or between the carbon core (221) and the second chamber (214).

6. The fuel tank isolation control device according to claim 5, characterized in that: in, The first carbon core covering (224) is a sponge, and the second carbon core covering (225) is a non-woven fabric.

7. The fuel tank isolation control device according to claim 5, characterized in that: in, A plurality of spaced protrusions (217) are provided on the inner side of the other end wall of the first chamber (213) or / and the second chamber (214). The plurality of spaced protrusions (217) are used to install the second carbon core covering (225), and gas flow gaps are formed between the spaced protrusions (217).

8. The fuel tank isolation control device according to claim 1, characterized in that: in, The charcoal canister shell (21) comprises: The main housing (21a) has a housing cavity with a bottom opening, and a partition plate (218) is formed in the middle of the housing cavity to divide it into the first chamber (213) and the second chamber (214); The bottom cover (21b) seals the bottom opening of the main housing (21a) and forms a gap between the partition plate (218) and the first chamber (213) and the second chamber (214). The first top cover (21c) has the isolation valve connector (211) and the desorption connector (216) and is installed on the outside of the other end wall of the first chamber (213); The first chamber (213) has an air inlet (2133) and a desorption port (2134) on the other end wall; The isolation valve connector (211) is connected to the first chamber (213) through the air inlet (2133), and the first chamber (213) is connected to the desorption connector (216) through the desorption port (2134).

9. A fuel tank isolation control device according to any one of claims 1-8, characterized in that: in, The other end of the first chamber (213) is provided with a blocking part (215) and it is divided 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).

10. A fuel tank isolation control device according to any one of claims 1-8, characterized in that: in, 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) is 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) to connect the first inner cavity (111) and a charcoal canister connector (115) to connect the second inner cavity (112). The first inner cavity (111) is provided with an air outlet control unit (12) capable of sealing or opening the air outlet (1131). The air outlet control unit (12) includes a driver (121), a control spring (122), and a sealing plug (123). The valve stem (1211) of the driver (121) is provided with a sealing plug (123) at its outer end. The control spring (122) is fitted on the outside of the valve stem (1211) and abuts against the driver (121) and the sealing plug (123) to drive the sealing plug (123) to seal the air outlet (1131). When the fuel tank isolation control device is installed on the vehicle, the force of the control spring (122) driving the sealing plug (123) to seal the vent (1131) is not negatively affected by the weight of the sealing plug (123).

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