Oil tank isolating valve

Abstract

The utility model discloses an oil tank isolating valve in the technical field of automobile isolating valve devices, which comprises a shell, a pipe cavity is arranged in the shell, an upper pipe cavity and a lower pipe cavity in the pipe cavity are communicated through an air hole in the middle of a connecting table, an oil tank pipeline joint communicated with the upper pipe cavity is arranged on the side face of the shell, and a carbon tank pipeline joint is integrally formed on the lower portion of the shell. An upper valve head assembly is arranged in the upper pipe cavity and controlled by an electromagnetic coil assembly on the top of the shell to move, a lower valve head assembly is arranged in the lower pipe cavity, a lower valve head of the lower valve head assembly is supported on a top protruding block of the carbon tank pipeline connector through a lower spring, and the lower spring pushes the lower valve head to be upwards close to the upper valve head assembly. A shoulder capable of forming sealing with the upper valve head assembly is arranged on the lower valve head. The carbon tank pipeline connector and the bottom of the shell are integrally formed, the valve body is directly manufactured, the installation process is simplified, the sealing performance is good, leakage is avoided, and the using stability and reliability of the isolating valve are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile isolation valve device, especially relates to an oil tank isolation valve. BACKGROUND

[0002] The oil tank isolation valve (FTIV valve) is controlled by a special module in the engine control system, and the system will open or close the FTIV valve according to different requirements. Usually, the FTIV valve is normally closed, which isolates the high-pressure tank and forms an independent sealed space to ensure that the oil vapor evaporated from the fuel does not overflow. However, the FTIV valve must be opened under some working conditions to ensure the normal operation of other vehicle functions.

[0003] When the vehicle needs to be refueled: Since the FTIV valve is closed for a long time, the pressure in the tank is relatively high. Therefore, when the vehicle needs to be refueled, in order to prevent the fuel from being backfired, the FTIV valve needs to be powered on before the tank cover is opened. After the tank pressure is released to an acceptable range, the tank cover can be opened by the driver. Through this effective protection mechanism, the harm to personnel caused by the splashing of fuel is avoided, and the tank can also be filled normally. The specific operation and control process is as follows: the driver triggers the refueling button and sends a refueling request to the ECU. The ECU sends a control signal according to the tank pressure to control the FTIV valve to open. After the tank pressure drops to a certain value, the tank cover can be released and opened. After refueling is completed, the tank pressure reaches the set pressure, and the valve is closed after power-off.

[0004] In addition to the FTIV opening request from refueling, there is also a demand from the tank pressure protection. High-pressure tanks have upper and lower limits of pressure bearing range. Currently, the pressure bearing range of many manufacturers' high-pressure tanks is -15kPa~35kPa. In order to protect the high-pressure tank, the system will set the upper limit max and the lower limit min of the tank pressure threshold. When the tank pressure is higher than the upper limit, the FTIV valve opens to release the tank pressure to a reasonable range (usually set to 20-25kPa), and the FTIV valve is closed. Conversely, when the tank has a relatively large negative pressure that exceeds the lower limit of the tank pressure, the FTIV valve will also open to reduce the negative pressure of the tank, and this demand will also inhibit the opening of the carbon canister control valve to prevent the carbon canister from flushing to cause a larger negative pressure in the tank.

[0005] In addition, the national six regulations require leak diagnosis of the tank evaporation system, so during the leak diagnosis process, the system will also request to open the FTIV valve to meet the diagnosis requirements.

[0006] A kind of oil tank isolation valve control system is disclosed in Chinese patent database, announcement number is: CN 113915031 A, announcement date is: January 11, 2022, the device includes shell, shell includes upper valve shell, middle valve shell and lower valve shell;Oil tank pipeline joint and carbon tank pipeline joint, oil tank pipeline joint is connected middle valve shell, middle valve shell or lower valve shell is provided with first opening for communicating first air chamber and lower valve shell inner cavity;Electromagnetic coil assembly, valve head assembly and air supply reset spring, electromagnetic coil assembly is arranged in upper valve shell, valve head assembly extends into middle valve shell, electromagnetic coil assembly is used to drive valve head assembly to close or open first opening to block or open first opening;Pressure relief valve head and pressure relief reset spring, pressure relief valve head and pressure relief reset spring are arranged in lower valve shell;Pressure sensor;Controller, controller is connected pressure sensor and electromagnetic coil assembly to control the operation of electromagnetic coil assembly according to the pressure obtained by pressure sensor.The deficiencies of the device are that: the upper, middle and lower three parts of the shell are connected in three parts, the lower valve shell is additionally connected with the carbon tank joint, the assembly space is large, the manufacturing and assembly of parts are complex, and the manufacturing cost is increased. Practical new type content

[0007] The utility model aims at overcoming the defects in the prior art, providing an oil tank isolation valve, simplifying assembly parts, reducing assembly space, reducing product weight and reducing manufacturing cost.

[0008] The utility model discloses a kind of oil tank isolation valves, including shell, the tubular cavity for gas flow is equipped in the shell, the tubular cavity is divided into upper tubular cavity and lower tubular cavity by connecting table, the upper tubular cavity and lower tubular cavity are communicated by air hole in the middle of connecting table, the shell side is equipped with oil tank pipeline joint, the oil tank pipeline joint is communicated with the upper tubular cavity, the lower part of the shell is integrally formed with carbon tank pipeline joint, the upper tubular cavity is equipped with upper valve head assembly, the upper valve head assembly is controlled to move up and down by electromagnetic coil assembly on the top of shell, the lower tubular cavity is equipped with lower valve head assembly, the lower valve head of the lower valve head assembly is supported on the top lug of carbon tank pipeline joint by lower spring, lower spring pushes lower valve head to be close to upper valve head assembly upwards, shoulder table for forming seal with upper valve head assembly is equipped on the lower valve head.

[0009] The utility model discloses a kind of oil tank isolation valves, including shell, the tubular cavity for gas flow is equipped in the shell, the tubular cavity is divided into upper tubular cavity and lower tubular cavity by connecting table, the upper tubular cavity and lower tubular cavity are communicated by air hole in the middle of connecting table, the shell side is equipped with oil tank pipeline joint, the oil tank pipeline joint is communicated with the upper tubular cavity, the lower part of the shell is integrally formed with carbon tank pipeline joint, the upper tubular cavity is equipped with upper valve head assembly, the upper valve head assembly is controlled to move up and down by electromagnetic coil assembly on the top of shell, the lower tubular cavity is equipped with lower valve head assembly, the lower valve head of the lower valve head assembly is supported on the top lug of carbon tank pipeline joint by lower spring, lower spring pushes lower valve head to be close to upper valve head assembly upwards, shoulder table for forming seal with upper valve head assembly is equipped on the lower valve head.

[0010] Compared with prior art, the utility model has the beneficial effects that:

[0011] First, reduce the welding cover inside the valve body, reduce the manufacturing cost.

[0012] Second, the lower part of the valve body is replaced by a body type carbon pipe joint, which is directly formed during the casting of the valve body, simplifying the installation steps. The integrated joint structure does not need to be welded, has excellent sealing performance, effectively avoids leakage, and improves the reliability of the valve body.

[0013] Third, the integrated joint structure of the utility model is compact, can be conveniently passed through narrow space during installation, saves assembly space, and has low maintenance cost during long-term use.

[0014] Further, the electromagnetic coil assembly includes a moving iron core movably arranged inside the electromagnetic coil, and the moving iron core is provided with a pin connected with the upper valve head assembly.

[0015] Further, the upper valve head assembly includes an upper valve head, and an upper spring is arranged between the upper valve head and the electromagnetic coil. The upper valve head is close to or away from the connecting table through the elastic force of the upper spring. A plug groove matched with the pin is arranged at the connecting position of the top of the upper valve head and the moving iron core.

[0016] Further, the shoulder table bottom is recessed inward to form a shoulder table groove, and the shoulder table groove is matched with the top protrusion of the carbon tank pipe joint. When the lower valve head is close to the carbon tank pipe joint, the protrusion is inserted into the shoulder table groove to form a seal. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The overall structure of the utility model is shown Figure 1 .

[0018] Figure 2 The overall structure of the utility model is shown Figure 2

[0019] Figure 3 The Figure 2 cross-sectional structure of A-A direction is shown.

[0020] Figure 4 The Figure 3 enlarged structure of B is shown.

[0021] In the above figure, 1 is a shell, 2 is an electromagnetic coil, 3 is a moving iron core, 4 is an upper pipe cavity, 5 is an upper spring, 6 is an upper valve head, 7 is a lower valve head, 8 is a lower spring, 9 is a lower pipe cavity, 10 is a protrusion, 11 is a shoulder table, 12 is a shoulder table groove, 13 is a carbon tank pipe joint, 14 is a connecting table, 15 is an oil tank pipe joint, and 16 is a pin. DETAILED DESCRIPTION

[0022] As Figure 1The oil tank isolation valve shown comprises a housing 1, a cavity for airflow is arranged in the housing 1, the cavity is divided into an upper cavity 4 and a lower cavity 9 through a connecting table 14, the upper cavity 4 and the lower cavity 9 are communicated through an air hole in the middle of the connecting table 14, an oil tank pipeline joint 15 is arranged on the side of the housing 1 and is communicated with the upper cavity 4, a carbon tank pipeline joint 13 is integrally formed on the lower part of the housing 1, an upper valve head assembly is arranged in the upper cavity 4, the upper valve head assembly is controlled to move up and down by an electromagnetic coil assembly on the top of the housing 1, a lower valve head assembly is arranged in the lower cavity 9, a lower valve head 7 of the lower valve head assembly is supported on a top protruding block 10 of the carbon tank pipeline joint 13 by a lower spring 8, the lower spring 8 pushes the lower valve head 7 to move upward and close to the upper valve head assembly, a shoulder table 11 for forming a seal with the upper valve head assembly is arranged on the lower valve head 7.

[0023] The electromagnetic coil assembly comprises a moving iron core 3 movably arranged in the electromagnetic coil 2, and a pin 16 is arranged on the bottom of the moving iron core 3 and connected with the upper valve head assembly.

[0024] The upper valve head assembly comprises an upper valve head 6, an upper spring 5 is arranged between the upper valve head 6 and the electromagnetic coil 2, the upper spring 5 is used to make the upper valve head 6 close to or away from the connecting table 14 through the elastic force of the upper spring 5, and a slot matched with the pin 16 is arranged at the connecting position between the top of the upper valve head 6 and the moving iron core 3.

[0025] The bottom of the shoulder table 11 is inwardly recessed to form a shoulder table recess 12, the shoulder table recess 12 is opposite to the top protruding block 10 of the carbon tank pipeline joint, when the lower valve head 7 moves downward and closes to the carbon tank pipeline joint 13, the protruding block 10 is inserted into the shoulder table recess 12 to form a seal.

[0026] In the utility model, the carbon tank pipeline joint 13 is integrally formed on the bottom of the housing 1, the carbon tank pipeline joint is not additionally connected on the bottom of the bottom cover of the housing 1 in the prior art, the carbon tank pipeline joint can be directly formed during the manufacturing of the valve body, the additional installation process is not needed, the installation process is simplified, the sealing performance is guaranteed, leakage is avoided, the stability and reliability of the isolation valve are improved, the plastic welding cover in the housing is not needed, the overall weight of the isolation valve is reduced, the number of parts is reduced, and the manufacturing cost is reduced.

[0027] The utility model is not limited to the above embodiment, on the basis of the technical scheme disclosed in the utility model, the skilled in the art can make some substitutions and deformation to some technical features according to the disclosed technical content without creative labor, and the substitutions and deformation are all within the protection scope of the utility model.

Claims

1. A fuel tank isolation valve, comprising a housing, wherein a lumen is provided within the housing for airflow, the lumen being divided into an upper lumen and a lower lumen by a connecting platform, the upper and lower lumens being connected via an air hole in the middle of the connecting platform, a fuel tank pipe connector being provided on the side of the housing, the fuel tank pipe connector being connected to the upper lumen, and characterized in that: A carbon canister pipeline joint is integrally formed at the lower part of the shell, an upper valve head assembly is provided in the upper tube cavity, and the upper valve head assembly is controlled to move up and down by the electromagnetic coil assembly at the top of the shell, and a lower valve head assembly is provided in the lower tube cavity, and the lower valve head of the lower valve head assembly is supported on the top protrusion of the carbon canister pipeline joint by a lower spring, and the lower spring pushes the lower valve head upward to approach the upper valve head assembly, and a shoulder is provided on the lower valve head for forming a seal with the upper valve head assembly.

2. The fuel tank isolation valve according to claim 1, characterized in that: The electromagnetic coil assembly includes a moving iron core movably arranged inside the electromagnetic coil, and a pin connected to the upper valve head assembly is provided at the bottom of the moving iron core.

3. The fuel tank isolation valve according to claim 2, characterized in that: The upper valve head assembly includes an upper valve head, an upper spring is provided between the upper valve head and the electromagnetic coil, and the upper valve head is moved closer to or away from the connecting platform by the elastic force of the upper spring. A slot adapted to the pin is provided at the connection between the top of the upper valve head and the moving iron core.

4. The fuel tank isolation valve according to claim 1, characterized in that: The bottom of the shoulder is recessed inward to form a shoulder groove, which is matched with the top protrusion of the carbon canister pipeline joint. When the lower valve head moves downward and approaches the carbon canister pipeline joint, the protrusion is inserted into the shoulder groove to form a seal.

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