Oil filling limiting valve for high-pressure oil tank of hybrid electric vehicle
By adopting a double-float structure and a step-staggered installation of the refueling limit valve design on the high-pressure hybrid vehicle tank, the problem of insufficient exhaust capacity of the high-pressure tank is solved, and the exhaust volume and refueling volume control of more than 250L/min are achieved.
Patent Information
- Application Number
- CN202422647461.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The refueling limit valves of existing high-pressure hybrid vehicle fuel tanks cannot meet the requirements of greater exhaust capacity and reopening ability, resulting in valve failure and inability to effectively control oil and gas emissions.
It adopts a double float structure, including a large float and a small float, which are installed in a stepped staggered manner. The valve is designed with a small exhaust hole above the large float and a large exhaust hole above the small float. It is sealed by a sealing component and combined with an O-ring and spring design to enhance the exhaust capacity.
The maximum exhaust volume of the high-pressure fuel tank is greater than 250L/min, which effectively controls the refueling amount and meets the exhaust requirements of high-pressure hybrid vehicles.
Smart Images
Figure CN223388080U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hybrid vehicles, in particular to a refueling limit valve on a high-pressure oil tank of a hybrid vehicle. Background Art
[0002] The fuel limit valve (FLVV) is installed on the top of the fuel tank and can be used to discharge oil and gas from the fuel tank and control the fuel quantity valve when refueling the car.
[0003] FLVV function of high-pressure hybrid: Compared with the FLVV application on the fuel tank of conventional (traditional) fuel vehicles, the FLVV of high-pressure hybrid requires greater exhaust capacity and reopening ability for its performance.
[0004] The FLVV at normal pressure can only be used with a reopening capacity of 15kPa and a maximum exhaust capacity of about 160L / min. However, in hybrid vehicles, due to regulatory requirements, the pressure inside the fuel tank needs to be controlled at 30kPa or above. Therefore, when the valve is closed, the product needs to overcome the closing force on the valve float under this pressure and open the valve.
[0005] A new fuel tank isolation valve (FTIV) has been added to the high-pressure hybrid tank exhaust system. When the FTIV is opened, a very large air flow rate will be generated. If the FLVV does not have a larger exhaust capacity, the valve will produce air resistance, thereby closing the valve and preventing exhaust, resulting in serious failure. Summary of the Invention
[0006] The utility model aims to overcome the defects of the prior art and provide a refueling limit valve for a high-pressure fuel tank of a hybrid vehicle, so as to solve the problems of being unable to exhaust and being unable to control the refueling of the vehicle.
[0007] In order to solve the above technical problems, the utility model is achieved as follows:
[0008] A refueling limit valve for a high-pressure fuel tank of a hybrid vehicle is characterized in that it includes a housing, a valve body, and a dual-float structure; the valve body is disposed within the housing, the dual-float structure is mounted on the valve body, and a vent corresponding to the dual-float structure is provided at the upper end of the valve body and is sealed by a sealing assembly.
[0009] The refueling limit valve for a hybrid vehicle's high-pressure fuel tank is characterized in that the dual-float structure includes a large float and a small float, which are installed in a stepped staggered structure, with the small float installed on the upper side of the large float.
[0010] The refueling limit valve for a high-pressure fuel tank of a hybrid vehicle is characterized in that a small exhaust hole is provided above the large float, and a large exhaust hole is provided above the small float.
[0011] The refueling limit valve for a high-pressure fuel tank of a hybrid vehicle is characterized in that the sealing assembly at the top of the large float includes a fixing bracket and a sealing sheet mounted on the fixing bracket.
[0012] The refueling limit valve for the high-pressure fuel tank of a hybrid vehicle is characterized in that a spring is provided at the lower portion of the large float.
[0013] The refueling limit valve for a hybrid vehicle's high-pressure fuel tank is characterized in that an O-ring is installed on the upper portion of the valve body.
[0014] 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 refueling limit valve for a high-pressure fuel tank of a hybrid vehicle, which is used for oil and gas discharge from the fuel tank and for controlling vehicle refueling. The present application has a greater exhaust capacity, and the maximum exhaust volume can be greater than 250L / min. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:
[0016] Figure 1 This is a schematic diagram of the structure of this application. DETAILED DESCRIPTION
[0017] 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.
[0018] like Figure 1 As shown: A refueling limit valve for a hybrid vehicle's high-pressure fuel tank includes a housing 1, a valve body 2, and a dual-float structure. The valve body is disposed within the housing, and the dual-float structure is mounted on the valve body. A vent corresponding to the dual-float structure is provided at the upper end of the valve body and is sealed by a sealing assembly.
[0019] Furthermore, the double-float structure includes a large float 4 and a small float 8, which are installed in a stepped staggered structure, with the small float installed on the upper side of the large float.
[0020] A small exhaust hole is located above the large float, and a large exhaust hole is located above the small float.
[0021] The sealing component at the top of the large float includes a fixed bracket and a sealing sheet 5 installed on the fixed bracket 6. The sealing component at the top of the small float is a sealing ring 9.
[0022] A spring 3 is provided at the lower portion of the large float; an O-ring 7 is installed at the upper portion of the valve body.
[0023] The high-pressure hybrid FLVV valve needs to overcome greater reopening and exhaust capabilities, which requires a larger and heavier float.
[0024] Due to the limited size of the valve body, this requirement needs to be met within the restricted volume without losing the original float sensitivity and its function.
[0025] This application adopts the following technologies:
[0026] The valve still needs to be opened in two stages, and a double float structure is used internally.
[0027] The float adopts a stepped staggered installation structure, that is, the small float "sits" on the big float.
[0028] There is an exhaust hole above the large and small floats respectively. There is a small exhaust hole above the large float and a large exhaust hole above the small float.
[0029] Working status of the valve:
[0030] Exhaust state: Since the small float is located on the large float, the airflow cannot directly act on the small float in the exhaust path. Therefore, the maximum exhaust volume of the valve can be greater than 210 L / min or 250 L / min or greater.
[0031] Valve closing: The valve needs to control the amount of refueling. Therefore, when the oil touches the valve, the large float can support the small float to rise together, and close the large and small exhaust holes above to seal and test the refueling control function.
[0032] Valve Opening: When the valve opens, the large float, pressed against the small vent, experiences a smaller upward closing force (30 kPa or higher at the same pressure). Consequently, the large float disengages from the vent first, allowing the small vent to open and release air. When the vent (pressure relief) reaches a low value (≈1 kPa), the force on the small float decreases, allowing it to fully open.
[0033] The above structure enables the use of the valve in a high-pressure oil tank.
[0034] 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 refueling limit valve for a high-pressure fuel tank of a hybrid vehicle, characterized by: It includes a shell, a valve body, and a double float structure; the valve body is arranged in the shell, the double float structure is installed on the valve body, and a vent hole corresponding to the double float structure is provided on the upper end of the valve body and is sealed by a sealing component.
2. The refueling limit valve for a hybrid vehicle high-pressure fuel tank according to claim 1, characterized in that: The double-float structure includes a large float and a small float, which are installed in a step-displacement structure, and the small float is installed on the upper side of the large float.
3. The refueling limit valve for a hybrid vehicle high-pressure fuel tank according to claim 2, characterized in that: A small exhaust hole is located above the large float, and a large exhaust hole is located above the small float.
4. The refueling limit valve for a high-pressure fuel tank of a hybrid vehicle according to claim 2, characterized in that: The sealing assembly at the top of the large float comprises a fixing bracket and a sealing sheet installed on the fixing bracket.
5. The refueling limit valve for a hybrid vehicle high-pressure fuel tank according to claim 2, characterized in that: A spring is provided at the bottom of the large float.
6. The refueling limit valve for a high-pressure fuel tank of a hybrid vehicle according to claim 1, characterized in that: An O-ring is installed on the upper part of the valve body.