Pipeline structure for limiting exhaust flow in exhaust pipeline
By introducing an air-blocking valve structure into the fuel tank to limit the exhaust flow, the problem of the valve float closing due to high pressure when refueling the tank is solved, and normal refueling of the tank is achieved.
Patent Information
- Application Number
- CN202421805207.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-07-29
AI Technical Summary
The fuel tank generates extremely high pressure and flow when the FTIV opens instantly, causing the valve float to close and preventing normal refueling.
A pipeline structure including a fuel tank, a valve, an isolation valve, a carbon canister and a gas resistance valve is designed. The gas resistance valve is used to push the piston close to the valve mouth under high pressure, thereby reducing the cross-sectional area of the exhaust channel, limiting the exhaust flow and preventing the float from being closed.
By limiting the exhaust flow, the valve float is prevented from closing, ensuring that the fuel tank can be refueled normally.
Smart Images
Figure CN223410926U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a pipeline structure, in particular to a pipeline structure for limiting the exhaust flow in an exhaust pipeline. Background Art
[0002] According to national standards, the high-pressure hybrid fuel tank needs to withstand an internal pressure of 30kPa as a normal use environment. However, when the tank is filled with fuel, the FTIV will open to quickly release the pressure in the tank to facilitate the refueling of the car.
[0003] Due to the high internal pressure in the fuel tank, once the FTIV opens, extremely high pressure and flow are generated at the valve outlet. This creates a very large impact force, pushing the float and closing the valve. Once this occurs, the fuel tank cannot release pressure, and refueling is impossible. Summary of the Invention
[0004] The utility model aims to overcome the defects of the prior art, provide a pipeline structure for limiting the exhaust flow in the exhaust pipeline, and solve the problem that the oil tank cannot release the pressure.
[0005] In order to solve the above technical problems, the utility model is achieved as follows:
[0006] A pipeline structure for limiting the exhaust flow in an exhaust pipeline is characterized in that it includes a fuel tank, a valve, an isolation valve, a carbon canister and a gas resistance valve; the valve is installed inside the fuel tank, and the gas resistance valve, the isolation valve and the carbon canister are connected to the outside of the fuel tank in sequence.
[0007] The pipeline structure for limiting the exhaust flow in the exhaust pipeline is characterized in that the valve is a valve with a float structure.
[0008] The pipeline structure for limiting the exhaust flow in the exhaust pipeline is characterized in that the isolation valve is a FTIV valve.
[0009] The pipeline structure for limiting the exhaust flow in the exhaust pipeline is characterized in that: the air resistance valve includes a shell, a piston and a spring connected to one end of the piston are provided in the shell, valve nozzles are provided on both sides of the shell, and a center hole is provided in the center of the piston for ventilation.
[0010] The pipeline structure for limiting the exhaust flow in the exhaust pipeline is characterized in that the size of the central hole is adjusted according to different air flow rates.
[0011] The beneficial effects of the present invention are as follows: It can be seen from the above technical solution that the present application provides a pipeline structure for limiting the exhaust flow in the exhaust pipeline, which can be optimized by adding a separate air resistance valve. Under high pressure, the piston in the air resistance valve will be pushed so that the piston is close to the plane of the second valve mouth. At this time, the air flow can only be ventilated through the center hole of the piston. This center hole reduces the cross-sectional area of the exhaust channel and thus reduces the flow rate. The small flow rate cannot generate sufficient impact force to prevent the float of the valve from being closed.
[0012] The present application uses an air-blocking valve to limit the exhaust flow in the exhaust pipeline to avoid air blockage of the valve in the system pipeline caused by excessive airflow. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:
[0014] Figure 1 This is a schematic diagram of the structure of this application.
[0015] Figure 2 Schematic diagram of the air resistance valve. DETAILED DESCRIPTION
[0016] The following will clearly and completely describe the technical solutions of the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection requested by this application.
[0017] like Figure 1 As shown: A pipeline structure for limiting the exhaust flow in the exhaust pipeline, which includes a fuel tank, a valve, an isolation valve, a carbon canister and a gas resistance valve; the valve is installed in the fuel tank, and the gas resistance valve, the isolation valve and the carbon canister are connected to the outside of the fuel tank in sequence.
[0018] Furthermore, the valve is a valve with a float structure, which enhances the reliability of the valve opening and closing.
[0019] Furthermore, the isolation valve is a FTIV valve, which seals the evaporated oil and gas in the fuel tank in the high-pressure fuel tank, and releases the oil and gas in the fuel tank into the charcoal canister only before refueling, and enters the engine through the charcoal canister for combustion.
[0020] like Figure 2 As shown: the air resistance valve includes a shell 1, a piston 2 and a spring 3 connected to one end of the piston are provided in the shell, a first valve nozzle 4 and a second valve nozzle 5 are provided on both sides of the shell, and a center hole 6 is provided in the center of the piston for ventilation; the size of the center hole is adjusted according to different air flow rates.
[0021] This application adds a separate air-blocking valve. Under low pressure conditions, typically 0--->5 kPa, air can be ventilated from both sides of the piston and the piston's center hole simultaneously. Under high pressure conditions (in hybrid vehicles, the operating pressure in the fuel tank is 30 kPa or above, which is the instantaneous opening pressure; in actual design, a relatively lower instantaneous opening pressure can be defined based on the operating environment), the piston in the air-blocking valve is pushed, causing the piston to cling to the plane of the second valve orifice. At this time, air can only be ventilated through the piston's center hole. This center hole reduces the cross-sectional area of the exhaust channel and thus reduces the flow rate. The low flow rate cannot generate sufficient impact force to prevent the valve float from closing.
[0022] The above are only embodiments provided for this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.
Claims
1. A pipe structure for limiting the exhaust flow in an exhaust pipe, characterized by: It includes an oil tank, a valve, an isolation valve, a carbon canister and a gas-blocking valve; the valve is installed inside the oil tank, and the outside of the oil tank is connected with the gas-blocking valve, the isolation valve and the carbon canister in sequence.
2. A pipe structure for limiting exhaust flow in an exhaust pipe according to claim 1, characterized in that: The valve is a valve with a float structure.
3. The pipeline structure for limiting the exhaust flow in the exhaust pipeline according to claim 1, characterized in that: The isolation valve is a FTIV valve.
4. The pipeline structure for limiting the exhaust flow in the exhaust pipeline according to claim 1, characterized in that: The air resistance valve comprises a housing, a piston and a spring connected to one end of the piston are arranged in the housing, valve nozzles are arranged on both sides of the housing, and a center hole is arranged in the center of the piston for ventilation.
5. The pipeline structure for limiting the exhaust flow in the exhaust pipeline according to claim 4, characterized in that: The size of the central hole is adjusted according to different air flow rates.