阅读说明：本技术 一种油箱排气阀 (Exhaust valve of oil tank ) 是由 朱晓通 于 2021-08-18 设计创作，主要内容包括：本发明公开了一种油箱排气阀,通过在阀体上开设第一排出口,在阀体内滑动设置阀芯部；并在阀芯部上设置活动密封部,活动密封部上设置与第一排出口相对应的第二排出口。关闭时,阀芯部上升,带动活动密封部上升并贴合于阀芯容置腔的顶面,关闭第一排出口,此时第一排出口与第二排出口连通；阀芯部继续上升,贴合于活动密封部的第二侧面,关闭第二排出口,完成整体关闭。当需要打开时,第二排出口的流通面积较小,故在压力较高的情况下更容易开启；阀芯下沉,使得阀芯部与活动密封件撕开,第二排出口开启；压力进一步降低,阀芯继续下沉,带动活动密封部脱离阀芯容置腔,完成整体开启。解决了现有油箱排气阀在高压力下无法重新开启的问题。(The invention discloses an oil tank exhaust valve.A first exhaust port is formed on a valve body, and a valve core part is arranged in the valve body in a sliding manner; and a movable sealing part is arranged on the valve core part, and a second discharge port corresponding to the first discharge port is arranged on the movable sealing part. When the valve core is closed, the valve core part rises to drive the movable sealing part to rise and attach to the top surface of the valve core accommodating cavity, the first exhaust port is closed, and the first exhaust port is communicated with the second exhaust port; the valve core part continues to rise and is attached to the second side face of the movable sealing part, the second discharge port is closed, and the integral closing is completed. When the valve needs to be opened, the flow area of the second discharge port is smaller, so that the valve is easier to open under the condition of higher pressure; the valve core sinks, so that the valve core part and the movable sealing piece are torn, and the second discharge port is opened; the pressure is further reduced, the valve core continues to sink, the movable sealing part is driven to be separated from the valve core accommodating cavity, and the integral opening is completed. The problem of current oil tank discharge valve can't reopen under high pressure is solved.)

1. An oil tank exhaust valve is characterized by comprising a valve body, a valve core part and a movable sealing part;

a valve core accommodating cavity is arranged in the valve body; the valve body is provided with an inflow channel which communicates the valve core accommodating cavity with the outer space of the valve body; the upper end of the valve body is provided with a first discharge port communicated with the valve core accommodating cavity;

the valve core part is connected in the valve core accommodating cavity in a sliding manner;

the movable sealing part is movably connected with the valve core part and is positioned between the valve core part and the first discharge port; the surface of the movable sealing part facing the first discharge port is a first side surface, and the surface of the movable sealing part facing the valve core part is a second side surface;

the movable sealing part is provided with a second discharge port which is communicated with the first side surface and the second side surface, the second discharge port corresponds to the first discharge port, and the flow area of the second discharge port is smaller than that of the first discharge port;

the first side surface is used for being matched with the top surface of the valve core accommodating cavity to close the first exhaust port, and when the first exhaust port is closed, the first exhaust port is communicated with the second exhaust port; the second side face is used for being matched with the upper end of the valve core part to close the second discharge port.

2. The fuel tank vent valve of claim 1, wherein the movable seal portion further comprises a first seal and a second seal;

the first sealing element is arranged on the first side surface or the top surface of the valve core accommodating cavity, corresponds to the first discharge port and is used for being matched with the movable sealing part to close the first discharge port;

the second sealing element is arranged on the second side surface or the top surface of the valve core part, corresponds to the second discharge port and is used for being matched with the movable sealing part to close the second discharge port.

3. The tank vent valve according to claim 2, wherein a plurality of protrusions are provided on a top surface of the spool portion, the protrusions having a height less than a height of the second seal, and the protrusions being disposed around the second seal.

4. A fuel tank vent valve as set forth in claim 1 wherein said moveable seal portion comprises a moveable connector and a flexible seal;

the first end of the movable connecting piece is movably connected with the valve core part, and the second end of the movable connecting part is connected with the flexible sealing piece;

the flexible sealing element is provided with the second discharge port.

5. The fuel tank vent valve of claim 4 wherein the flexible connector and the flexible seal are formed by a two-shot overmolding process.

6. An oil tank vent valve according to claim 4, wherein the spool portion is provided with a connecting shaft; the first end of the movable connecting piece is provided with a connecting groove which is sleeved on the connecting shaft, and the size of an opening of the connecting groove is smaller than the diameter of the connecting shaft.

7. The tank vent valve of claim 1, wherein the inlet passage comprises a first passage and a second passage; the first channel is arranged at the bottom of the valve body; the second channel is arranged on the side wall of the valve body.

8. A tank vent valve as set forth in claim 7 wherein said valve body defines a recessed cavity in a bottom surface thereof, said first passageway being defined in said recessed cavity bottom surface.

9. The tank vent valve according to claim 1, wherein the spool portion includes a float and an elastic member; the floater is matched and in sliding connection with the rib groove on the inner side surface of the valve core accommodating cavity; and two ends of the elastic piece are respectively connected with the floater and the valve core accommodating cavity.

10. The fuel tank vent valve according to claim 1, further comprising a pressure maintaining portion provided at an upper end of the valve body, and an input end of the pressure maintaining portion communicates with the first vent port.

11. The fuel tank vent valve according to claim 10, wherein the pressure retaining portion includes a pressure retaining case and a pressure retaining cap; a pressure maintaining cavity is arranged in the pressure maintaining shell, and an inflow hole and a discharge hole which are communicated with the pressure maintaining cavity are also arranged on the pressure maintaining shell; the pressure maintaining shell is arranged at the upper end of the valve body, and the inflow hole is communicated with the first exhaust hole; the pressure-maintaining cover is connected with the pressure-maintaining cavity in a sliding mode and used for opening and closing the inflow hole.

12. A fuel tank vent valve as set forth in claim 1 further comprising a housing and a flange;

the flange covers the shell and is matched with the shell to form a valve body accommodating cavity; the valve body is accommodated in the valve body accommodating cavity and is in sealing connection with the flange and/or the shell, and the top surface of the valve body is matched with the flange to form a fluid discharge chamber for guiding fluid discharged from the first discharge port;

wherein, the shell is provided with a communicating channel communicated with the valve body accommodating cavity.

Technical Field

The invention belongs to the technical field of valves, and particularly relates to an exhaust valve of an oil tank.

Background

The top at the oil tank assembly is installed to the oil tank discharge valve, and in traditional oil tank discharge valve technique, when the vehicle normally traveled, discharge valve opened all the time in order to discharge fuel steam, but, when the vehicle took place to empty or the rollover, discharge valve self-closing. Exhaust valve in the six state technique: under normal conditions, fuel vapor is allowed to flow from the fuel tank to the carbon tank, so that excessive positive pressure is prevented from being generated in the fuel tank; during operation and refueling, if the pressure in the fuel tank is high enough, the head valve opens to allow more fuel vapor to flow from the fuel tank to the canister; when the carbon tank is desorbed, fresh air is allowed to be supplemented into the oil tank through the carbon tank, so that excessive negative pressure is prevented from being generated in the oil tank; in special case, when the vehicle is turned over or inclined at a large angle, the exhaust valve is closed to prevent fuel leakage.

The oil tank vent valve seal structure on the existing market is sealed through two planes, and the design of an exhaust port is large, so that the opening pressure point of the valve is low. In addition, the sealing structure is sealed by two planes, so that the requirements on the flatness, the surface smoothness and the parallelism of the float and the valve body after the two planes are installed are very high, and a good sealing effect can be achieved. However, good flatness, surface smoothness and parallelism after two-plane mounting cannot be satisfied in the actual production and manufacturing process. Therefore, the structure has poor sealing performance and low safety factor. Meanwhile, the reject ratio of production is increased, the rejection rate of products is improved, and the manufacturing cost is higher.

Disclosure of Invention

The invention aims to provide an oil tank vent valve to solve the problem that the existing oil tank vent valve cannot be reopened under high pressure due to a low opening pressure point.

In order to solve the problems, the technical scheme of the invention is as follows:

the invention relates to an oil tank exhaust valve which comprises a valve body, a valve core part and a movable sealing part;

a valve core accommodating cavity is arranged in the valve body; the valve body is provided with an inflow channel which communicates the valve core accommodating cavity with the outer space of the valve body; the upper end of the valve body is provided with a first discharge port communicated with the valve core accommodating cavity;

the valve core part is connected in the valve core accommodating cavity in a sliding manner;

the movable sealing part is movably connected with the valve core part and is positioned between the valve core part and the first discharge port; the surface of the movable sealing part facing the first discharge port is a first side surface, and the surface of the movable sealing part facing the valve core part is a second side surface;

the movable sealing part is provided with a second discharge port which is communicated with the first side surface and the second side surface, the second discharge port corresponds to the first discharge port, and the flow area of the second discharge port is smaller than that of the first discharge port;

the first side surface is used for being matched with the top surface of the valve core accommodating cavity to close the first exhaust port, and when the first exhaust port is closed, the first exhaust port is communicated with the second exhaust port; the second side face is used for being matched with the upper end of the valve core part to close the second discharge port.

According to the oil tank exhaust valve, the movable sealing part further comprises a first sealing element and a second sealing element;

the first sealing element is arranged on the first side surface or the top surface of the valve core accommodating cavity, corresponds to the first discharge port and is used for being matched with the movable sealing part to close the first discharge port;

the second sealing element is arranged on the second side surface or the top surface of the valve core part, corresponds to the second discharge port and is used for being matched with the movable sealing part to close the second discharge port.

According to the oil tank exhaust valve, the top surface of the valve core part is provided with the plurality of convex blocks, the height of each convex block is smaller than that of the second sealing element, and the convex blocks are arranged around the second sealing element.

According to the oil tank exhaust valve, the movable sealing part comprises a movable connecting piece and a flexible sealing piece;

the first end of the movable connecting piece is movably connected with the valve core part, and the second end of the movable connecting part is connected with the flexible sealing piece;

the flexible sealing element is provided with the second discharge port.

According to the oil tank exhaust valve, the movable connecting piece and the flexible sealing piece are processed by adopting a secondary plastic coating process.

According to the oil tank exhaust valve, the valve core part is provided with the connecting shaft; the first end of the movable connecting piece is provided with a connecting groove which is sleeved on the connecting shaft, and the size of an opening of the connecting groove is smaller than the diameter of the connecting shaft.

According to the oil tank exhaust valve, the inflow channel comprises a first channel and a second channel; the first channel is arranged at the bottom of the valve body; the second channel is arranged on the side wall of the valve body.

According to the oil tank exhaust valve, the bottom surface of the valve body is provided with the sunken cavity, and the first channel is arranged on the bottom surface of the sunken cavity.

According to the oil tank exhaust valve, the valve core part comprises a floater and an elastic piece; the floater is matched and in sliding connection with the rib groove on the inner side surface of the valve core accommodating cavity; and two ends of the elastic piece are respectively connected with the floater and the valve core accommodating cavity.

The oil tank exhaust valve further comprises a pressure maintaining part, wherein the pressure maintaining part is arranged at the upper end of the valve body, and the input end of the pressure maintaining part is communicated with the first exhaust port.

According to the oil tank exhaust valve, the pressure maintaining part comprises a pressure maintaining shell and a pressure maintaining cover; a pressure maintaining cavity is arranged in the pressure maintaining shell, and an inflow hole and a discharge hole which are communicated with the pressure maintaining cavity are also arranged on the pressure maintaining shell; the pressure maintaining shell is arranged at the upper end of the valve body, and the inflow hole is communicated with the first exhaust hole; the pressure-maintaining cover is connected with the pressure-maintaining cavity in a sliding mode and used for opening and closing the inflow hole.

The oil tank exhaust valve further comprises a shell and a flange;

the flange covers the shell and is matched with the shell to form a valve body accommodating cavity; the valve body is accommodated in the valve body accommodating cavity and is in sealing connection with the flange and/or the shell, and the top surface of the valve body is matched with the flange to form a fluid discharge chamber for guiding fluid discharged from the first discharge port;

wherein, the shell is provided with a communicating channel communicated with the valve body accommodating cavity.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:

according to one embodiment of the invention, the valve body is provided with the first discharge port, and the valve core part is arranged in the valve body in a sliding manner; and a movable sealing part is arranged on the valve core part, and a second discharge port corresponding to the first discharge port is arranged on the movable sealing part. When the vehicle is inclined at a large angle or overturned to cause that the valve needs to be closed, oil enters the valve core accommodating cavity, so that the valve core part rises to drive the first side surface of the movable sealing part to rise and be attached to the top surface of the valve core accommodating cavity, the closing of the first discharge port is realized, and the first discharge port is communicated with the second discharge port; and meanwhile, the top surface of the valve core part is also attached to the second side surface of the movable sealing part, so that the second discharge port is closed, and the whole valve is closed. However, a certain pressure may be build up in the fuel tank under some conditions, and it is necessary to open the valve in time to relieve the pressure in the fuel tank. When the valve needs to be opened again, the second discharge port is easier to open under the condition of higher pressure because the flow area of the second discharge port is smaller than that of the first discharge port; the valve core sinks under the action of gravity, so that the top surface of the valve core part is torn away from the second side surface of the movable sealing piece, the second discharge port is opened, and the pressure in the fuel tank is released; when the pressure is further reduced, the valve core further sinks to drive the first side surface of the movable sealing part to be torn away from the top surface of the valve core accommodating cavity, so that the opening of the whole valve is completed. Therefore, the problem that the existing oil tank exhaust valve cannot be reopened under high pressure due to the fact that the opening pressure point of the existing oil tank exhaust valve is low is solved.

2. In one embodiment of the invention, the first sealing element is arranged between the first side surface of the movable sealing part and the top surface of the valve core accommodating cavity, the second sealing element is arranged between the second side surface of the movable sealing part and the top surface of the valve core part, and the first discharge port and the second discharge port are respectively sealed by the first sealing element and the second sealing element.

3. In one embodiment of the invention, the bumps with the height smaller than that of the second sealing element are arranged on the top surface of the valve core part, so that the impact on the second sealing element and the movable sealing part when the second outlet is closed can be reduced as much as possible, and the service life of the valve is prolonged as much as possible.

4. According to the embodiment of the invention, the movable sealing part is arranged into the movable connecting piece and the flexible sealing piece, the movable connecting piece is used for being connected with the valve core part, the flexible sealing piece is used for being matched with the top surface of the valve core accommodating cavity and the top surface of the valve core part to close the first discharge port and the second discharge port, the flexible sealing piece is arranged to enable the movable sealing part to be matched more tightly after extrusion, and the first discharge port and the second discharge port are sealed more reliably.

5. According to the embodiment of the invention, the movable connection between the movable connecting piece and the valve core part is set to be the connection between the connecting groove and the connecting shaft, the opening of the connecting groove is set to be small, so that the connecting shaft cannot be separated, and meanwhile, the size of the connecting groove in the opening is set to be large, so that the movable connecting piece can move up and down to a certain degree relative to the valve core part, and the second discharge port and the first discharge port can be conveniently opened.

6. According to the embodiment of the invention, the concave cavity is arranged on the bottom surface of the valve body, and the first channel for enabling the oil to flow into the valve core accommodating cavity is arranged in the concave cavity, so that the concave cavity can form the air cavity to reduce the impact of the oil, meanwhile, the height for enabling the oil to flow into the valve core accommodating cavity is higher, and further the closing height of the oil tank exhaust valve in the embodiment is improved.

Drawings

FIG. 1 is a schematic view of a fuel tank vent valve of the present invention;

FIG. 2 is another schematic view of the vent valve of the fuel tank of the present invention;

FIG. 3 is a schematic view of a movable seal portion of a fuel tank vent valve of the present invention;

FIG. 4 is a schematic view of the venting function of the tank vent valve of the present invention;

FIG. 5 is a schematic view of the exhaust and pressure maintaining function of the exhaust valve of the fuel tank according to the present invention;

FIG. 6 is a schematic view of the closure of the valve body of the tank vent valve of the present invention;

FIG. 7 is a schematic view of the movable sealing portion of the fuel tank vent valve of the present invention with the valve body closed;

FIG. 8 is a schematic view of the opening of a second vent port of the fuel tank vent valve of the present invention;

FIG. 9 is another schematic view of the opening of the second vent port of the fuel tank vent valve of the present invention;

FIG. 10 is a schematic view of the reopened rotating shaft side of the fuel tank vent valve of the present invention being opened first;

FIG. 11 is a schematic view of the reopened full opening of the fuel tank vent valve of the present invention;

fig. 12 is a graph of experimental opening pressure of the tank vent valve of the present invention.

Description of reference numerals: 1: a valve body; 101: a recessed cavity; 2: a valve core part; 201: a float; 202: an elastic member; 203: a connecting shaft; 204: a bump; 3: a movable sealing part; 301: a movable connecting piece; 302: a flexible seal; 303: a connecting groove; 4: a pressure maintaining part; 401: a pressure maintaining shell; 402: a pressure-maintaining cover; 5: a housing; 6: a flange; 7: a first discharge port; 8: a second discharge port; 9: a first channel; 10: a second channel; 11: a seal ring; 12: a first seal member; 13: a second seal.

Detailed Description

The present invention provides a fuel tank vent valve, which is described in further detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.

Example one

The embodiment is an GVV valve, which is applied to a fuel tank, and the fluid in the fuel tank is oil and gas in the fuel tank.

Referring to fig. 1 and 2, the fuel tank vent valve of the present embodiment includes a valve body 1, a valve core 2, and a movable sealing portion 3.

A valve core accommodating cavity is arranged in the valve body 1, and the valve core part 2 is connected in the valve core accommodating cavity in a sliding manner. The valve body 1 is provided with an inflow channel which communicates the valve core accommodating cavity with the outer space of the valve body 1. The upper end of the valve body 1 is provided with a first discharge port 7 communicated with the valve core accommodating cavity.

The movable sealing part 3 is movably connected to the valve core part 2 and is located between the valve core part 2 and the first discharge port 7. The surface of the movable sealing portion 3 facing the first discharge port 7 is a first side surface, and the surface of the movable sealing portion 3 facing the valve body portion 2 is a second side surface. The movable sealing part 3 is provided with a second discharge port 8 communicating the first side surface and the second side surface, the second discharge port 8 corresponds to the first discharge port 7, and the flow area of the second discharge port 8 is smaller than that of the first discharge port 7.

The first side face is used for being matched with the top face of the valve core accommodating cavity to close the first exhaust port 7, and when the first exhaust port 7 is closed, the first exhaust port 7 is communicated with the second exhaust port 8. The second side surface is used for closing the second discharge port 8 by matching with the upper end of the valve core part 2.

In the embodiment, the valve body 1 is provided with the first discharge port 7, and the valve core part 2 is arranged in the valve body 1 in a sliding manner; and a movable sealing part 3 is arranged on the valve core part 2, and a second discharge port 8 corresponding to the first discharge port 7 is arranged on the movable sealing part 3. When the vehicle is inclined at a large angle or overturned to cause that the valve needs to be closed, oil enters the valve core accommodating cavity, so that the valve core part 2 rises to drive the first side surface of the movable sealing part 3 to rise and be attached to the top surface of the valve core accommodating cavity, the closing of the first discharge port 7 is realized, and at the moment, the first discharge port 7 is communicated with the second discharge port 8; meanwhile, the top surface of the valve core part 2 is also attached to the second side surface of the movable sealing part 3, so that the second discharge port 8 is closed, and the whole valve is closed. However, a certain pressure may be build up in the fuel tank under some conditions, and it is necessary to open the valve in time to relieve the pressure in the fuel tank. When the valve needs to be reopened, the second discharge port 8 is more easily opened under the condition of higher pressure because the flow area of the second discharge port 8 is smaller than that of the first discharge port 7; the valve core sinks under the action of gravity, so that the top surface of the valve core part 2 is torn apart from the second side surface of the movable sealing piece, the second discharge port 8 is opened, and the pressure in the fuel tank is released; after the pressure is further reduced, the valve core further sinks to drive the first side surface of the movable sealing part 3 and the top surface of the valve core accommodating cavity to be torn, so that the whole valve is opened. Therefore, the problem that the existing oil tank exhaust valve cannot be reopened under high pressure due to the fact that the opening pressure point of the existing oil tank exhaust valve is low is solved.

The specific structure of the oil tank vent valve of the present embodiment is further described below:

in the present embodiment, the movable seal portion 3 further includes a first seal member 12 and a second seal member 13.

The first sealing element 12 is disposed on the first side surface or the top surface of the valve element accommodating cavity, corresponds to the first discharge port 7, and is used for closing the first discharge port 7 in cooperation with the movable sealing portion 3. The second sealing element 13 is disposed on the second side surface or the top surface of the valve core portion 2, and corresponds to the second discharge port 8, and is used for closing the second discharge port 8 in cooperation with the movable sealing portion 3. The first sealing element 12 is arranged between the first side surface of the movable sealing part 3 and the top surface of the valve core accommodating cavity, the second sealing element 13 is arranged between the second side surface of the movable sealing part 3 and the top surface of the valve core part 2, and the first discharge port 7 and the second discharge port 8 are respectively sealed by the first sealing element 12 and the second sealing element 13.

Further, a plurality of bumps 204 are arranged on the top surface of the valve core part 2, the height of the bumps 204 is smaller than that of the second sealing member 13, and the bumps 204 are arranged around the second sealing member 13, so that the impact on the second sealing member 13 and the movable sealing part 3 when the second discharge port 8 is closed can be reduced as much as possible, and the service life of the valve can be prolonged as much as possible.

Referring to fig. 3, in the present embodiment, the movable seal portion 3 includes a movable connector 301 and a flexible seal member 302. Wherein, the first end of the movable connecting piece 301 is movably connected with the valve core part 2, and the second end of the movable connecting part is connected with the flexible sealing element 302. The flexible sealing element 302 is provided with the second discharge port 8, the flexible sealing element 302 is used for matching the top surface of the valve core accommodating cavity and the top surface of the valve core part 2 to close the first discharge port 7 and the second discharge port 8, the flexible sealing element is arranged to enable the flexible sealing element to be matched more tightly after being extruded, and the first discharge port 7 and the second discharge port 8 are sealed more reliably.

Further, the movable connecting piece 301 and the flexible sealing piece 302 can be processed by a secondary plastic coating process, and the secondary plastic coating process ensures the sealing performance between the movable connecting piece 301 and the flexible sealing piece 302. In other embodiments, other processing techniques can be used, and only the required product can be obtained by finishing the processing.

Further, regarding the connection manner of the movable connection member 301 and the valve core portion 2, a connection shaft 203 may be disposed on the valve core portion 2, and a connection groove 303 for sleeving connection is disposed at a first end of the movable connection member 301, the connection shaft 203 may rotate and move up and down freely in the connection groove 303, and a size of an opening of the connection groove 303 is smaller than a diameter of the connection shaft 203. Through the swing joint between the swing joint 301 and the valve core portion 2, the connection groove 303 and the connection shaft 203 are arranged to be connected, the opening of the connection groove 303 is arranged to be small, the connection shaft 203 cannot be separated, and meanwhile, the size of the connection groove 303 in the opening is arranged to be large, so that the swing joint 301 can move up and down to a certain degree relative to the valve core portion 2, and the second discharge port 8 and the first discharge port 7 can be conveniently opened.

In the present embodiment, the above-described inflow passage includes a first passage 9 and a second passage 10. The first passage 9 is provided at the bottom of the valve body 1. The second passage 10 is provided in a side wall of the valve body 1. The two channels are used for leading oil liquid and gas into the valve core accommodating cavity under different capacities and states of the oil liquid in the fuel tank.

Further, a recessed cavity 101 may be opened on the bottom surface of the valve body 1, and the first passage 9 is opened on the bottom surface of the recessed cavity 101. That is to say, set up a lug 204 on the bottom surface for case holding intracavity portion, set up first passageway 9 on this lug 204, sunken chamber 101 can form the impact that the air chamber reduced fluid, simultaneously, can make the fluid flow into the height in case holding chamber higher, and then improve the oil tank discharge valve's of this embodiment closing height.

In the present embodiment, the spool portion 2 includes a float 201 and an elastic member 202. The floater 201 is matched with and slidably connected with the rib groove on the inner side surface of the valve core accommodating cavity, a plurality of vertical guide ribs can be arranged on the inner side surface of the valve core accommodating cavity, and the corresponding guide grooves are formed in the floater 201, so that the floater 201 can slide up and down in the valve core accommodating cavity. The connecting shaft 203 may be installed at one side of the upper end of the float 201, and specifically, a notch may be provided at one side of the upper end of the float 201, and two columns may be provided in the notch and the connecting shaft 203 may be disposed on the two columns, so that the height of the connecting shaft 203 is not higher than the upper end surface of the float 201.

Both ends of the elastic member 202 are connected to the float 201 and the spool accommodation chamber, respectively. The elastic element 202 may be a spring, a groove may be formed on the bottom surface of the float 201, the groove corresponds to the protrusion 204 and is larger than the protrusion 204 in size, one end of the spring may be sleeved on the protrusion 204 and connected to the bottom surface of the valve element accommodating cavity, and the other end of the spring may extend into the groove on the bottom surface of the float 201 and connected to the float 201.

In this embodiment, the oil tank vent valve may further include a pressure maintaining portion 4, the pressure maintaining portion 4 is disposed at the upper end of the valve body 1, and an input end of the pressure maintaining portion 4 is communicated with the first vent outlet 7.

Specifically, the pressure holding section 4 includes a pressure holding shell 401 and a pressure holding cover 402. A pressure holding cavity is arranged in the pressure holding shell 401, and an inflow hole and a discharge hole which are communicated with the pressure holding cavity are also arranged on the pressure holding shell 401. The pressure maintaining case 401 is provided at the upper end of the valve body 1, and the inflow hole communicates with the first discharge port 7. A pressure-retaining cap 402 is slidably coupled to the pressure-retaining chamber for opening and closing the inflow orifice. That is, the pressure-retaining cover 402 is pressed at the inlet of the pressure-retaining chamber by its own gravity to close the inlet, and after the gas pressure in the valve core accommodating chamber reaches a value that can counteract the gravity of the pressure-retaining cover 402, the pressure-retaining cover 402 can be pushed to rise, so that the gas can enter the pressure-retaining chamber through the inlet and be discharged through the discharge hole.

Further, the pressure maintaining shell 401 may be configured as an annular protrusion and a cover plate on the top surface of the valve body 1, the annular protrusion is disposed around the first exhaust port 7, the cover plate covers the upper end of the annular protrusion, so as to form the pressure maintaining chamber, and a plurality of through holes are opened on the upper end of the annular protrusion or the cover plate, the through holes are the exhaust ports, so that the gas can be exhausted.

In this embodiment, the tank vent valve may further include a housing 5 and a flange 6. Wherein, the flange 6 covers the shell 5 and is matched with the shell to form an accommodating cavity of the valve body 1. The valve body 1 is accommodated in the accommodating cavity of the valve body 1 and is hermetically connected with the flange 6 and/or the shell 5, and the top surface of the valve body 1 is matched with the flange 6 to form a fluid discharge chamber for guiding fluid discharged from the pressure maintaining part 4 to an external pipeline for processing. The shell 5 is provided with a communicating channel communicated with the accommodating cavity of the valve body 1.

Taking a specific connection mode as an example, the flange 6 is in snap fit with the housing 5 to form an accommodating cavity of the valve body 1; the valve body 1 is arranged in the accommodating cavity of the valve body 1 and is in snap fit with the flange 6, the flange 6 and the valve body 1 can be connected in a welding or other fixed connection mode, and a sealing ring 113 is further adopted for sealing when necessary. The communication channel may be a communication channel respectively formed on the bottom surface of the housing 5 and the side surface of the housing 5, wherein the communication channel on the side surface of the housing 5 may be formed at the connection position of the housing 5 and the flange 6.

The pressure-retaining and exhausting function of the tank vent valve of the present embodiment in different situations will be described as follows:

firstly, when the fuel in the fuel tank is not full (the fuel in the fuel tank does not excessively submerge the valve core), the float 201 of the valve core part 2 is in a dropping state, the movable sealing part 3 matched with the float 201 and the first discharge port 7 on the valve body 1 do not form a seal, and meanwhile, the pressure maintaining cover 402 of the pressure maintaining part 4 is not blown up. The gas inside the fuel tank can now be discharged through the first discharge opening 7. The gas flow direction is shown in fig. 4.

Secondly, when the fuel tank is full of oil or some vehicles are at a certain inclination angle, after the internal floater 201+ the gravity of the movable sealing part 3-the elastic force of the spring, the integral difference is larger, and larger downward gravity is provided, so that the integral composed of the floater 201 and the movable sealing part 3 is not lifted, the first exhaust port of the valve body 1 is still in an open state, but the pressure maintaining part 4 is arranged above the first exhaust port of the valve body 1, so the integral exhaust valve of the fuel tank is still in a relatively sealed state, at the moment, the fuel in the fuel tank continuously volatilizes or is influenced by the temperature rise, the pressure in the fuel tank also continuously rises, and the pressure rising in the fuel tank needs to be timely discharged. When the pressure in the fuel tank rises enough to blow the pressure maintaining cover 402, the pressure in the fuel tank is reduced, air flow enters the valve through the small second channel 10 on the side surface of the base, passes through the first exhaust port 7 of the valve body 1, passes through the exhaust channel designed in the pressure maintaining part 4 and the pressure maintaining cavity, and is exhausted through the fluid exhaust cavity formed by the flange 6. As shown in fig. 5.

The function of the fuel tank vent valve closing seal according to the present embodiment will be described below:

when a vehicle runs, the situation that the vehicle shakes violently or has a certain inclination angle can occur, and the oil in the fuel tank also shakes violently, so that all the first discharge port 7 and the second discharge port 8 in the exhaust valve of the fuel tank are required to be sealed in time, and the oil in the fuel tank is prevented from leaking out through the first discharge port 7 and the second discharge port 8 in the exhaust valve of the fuel tank. The float 201 and the movable sealing part 3 in the valve core can rise in time along with shaking to close the first discharge port 7 at the top of the valve body 1, and the float 201 can cooperate with the movable sealing part to close the second discharge port 8. Thus, the whole valve core can form a sealed state to prevent fuel leakage (dynamic leakage). The closed state of the tank vent valve is shown in fig. 6 and 7.

The following explains the re-opening function of the tank vent valve of the present embodiment:

referring to fig. 8 to 11, when the entire valve core 2 is in a closed state (the valve core 2 is closed due to buoyancy in the fuel tank or shaking of the fuel tank, and the valve core 2, the movable sealing portion 3 and the valve body 1 form a seal), a certain pressure may be held in the fuel tank under some conditions, and at this time, the valve core 2 needs to be opened in time to discharge the pressure in the fuel tank. Since P is F/S, when F is constant, S is larger, P is smaller, that is, when there is a higher pressure in the fuel tank, the first outlet 7 of the valve body 1 has a larger cross-sectional area S, so that it is opened at a lower pressure. The second outlet 8 of the movable sealing part 3 is easy to open, the float 201 sinks under the action of gravity (as shown in fig. 2), the float 201 tears apart from the movable sealing part 3 after sinking (as shown in fig. 3), the second outlet 8 is opened, and the system pressure is gradually reduced. Then the first discharge port 7 of the movable seal portion 3 sealed with the valve body 1 is opened, and the side of the movable seal portion 3 connected with the float 201 is opened preferentially, and then is fully opened (as shown in fig. 4) to further accelerate the pressure relief in the fuel tank. After the valve passage is fully opened, more gas flows out of the tank to the canister, and the pressure in the tank is reduced. The experimental pressure curve of the opening pressure of the tank vent valve is shown in fig. 12.

Example two

The present embodiment further explains the first seal member 12 and the second seal member 13 in the first embodiment on the basis of the first embodiment.

In this embodiment, the first seal member 12 is disposed on the top surface of the cartridge receiving cavity, and the second seal member is disposed on the flexible seal member 302.

First, the first case will be explained: the first sealing element 12 may be a sealing ring extending from the top surface of the accommodating cavity of the valve body 1, and the sealing ring is sleeved on the first outlet 7. When the float 201 drives the movable sealing part 3 to ascend, the flexible sealing element 302 of the movable sealing part 3 ascends, and the upper surface of the flexible sealing element is flexibly attached to the sealing ring, so that the first exhaust port 7 is closed, at the moment, the first exhaust port 7 is closed relatively, the second exhaust port 8 is communicated with the first exhaust port 7, and gas can still be exhausted through the second exhaust port 8 and the first exhaust port 7.

Meanwhile, in this case, some materials are removed from the top surface of the accommodating cavity of the valve body 1 on the peripheral side of the outer ring of the sealing ring, so that a concave cavity 101 is formed to avoid other parts of the movable sealing part 3, and the situation that the top surface of the movable sealing part 3 is directly pressed against the top surface of the accommodating cavity of the valve body 1 to cause poor durability of the movable sealing part 3 when the valve body is closed is avoided.

The second case will be explained: the first sealing element 12 may be a flexible sealing ring extending over the flexible sealing element 302 and relatively sleeved on the first discharge opening 7. When the float 201 drives the movable sealing part 3 to rise, the flexible sealing part 302 of the movable sealing part 3 rises, and after rising to a certain height, the flexible sealing ring can be attached to the top surface of the accommodating cavity of the valve body 1, so that the first exhaust port 7 is closed.

In this embodiment, there are also two arrangements of the second seal 13, the first being on the lower end face of the flexible seal 302 and the second being on the float 201.

First, the first case will be explained: the second sealing element 13 may be a flexible sealing ring extending on the lower surface of the flexible sealing element 302, and the sealing ring is sleeved on the second discharge port 8. When the float 201 drives the movable sealing part 3 to ascend, the upper end of the movable sealing part is firstly attached to the accommodating cavity of the valve body 1 and limited, the float 201 continues to ascend, and after the upper end of the movable sealing part ascends to a certain height, the top surface of the float 201 can be attached to the lower end of the flexible sealing ring, so that the second exhaust port 8 is closed.

Further, in this case, a sealing groove corresponding to the flexible sealing ring may be formed on the top surface of the float 201, the sealing groove is designed as an inclined side surface, and the lower end of the flexible sealing ring extends into the sealing groove on the float 201 and is attached to the inclined side surface, so as to cooperate with the flexible sealing ring to close the second discharge port 8.

The second case will be explained: the second sealing element 13 may be a sealing ring extending on the top surface of the float 201 and relatively sleeved on the second discharge port 8. When the float 201 drives the movable sealing part 3 to ascend, the upper end of the movable sealing part is firstly attached to the accommodating cavity of the valve body 1 and limited, the float 201 continues to ascend, and after the upper end of the sealing ring on the top surface of the float 201 is attached to the lower surface of the upper flexible sealing part 302 after the upper end of the sealing ring rises to a certain height, so that the second exhaust port 8 is closed.

EXAMPLE III

This embodiment further explains the flexible sealing member 302 and the movable connecting member 301 in the first embodiment on the basis of the first embodiment.

In this embodiment, the articulating member 301 may include an articulating section, a middle section, and a support section that are connected in series.

The connecting groove 303 is formed in the movable connecting section, the cross section of the connecting groove 303 can be circular, kidney-shaped or rectangular, and only the requirement that the connecting shaft 203 can move up and down in the connecting groove 303 is met, and the size of the opening of the connecting groove 303 is smaller than that of the connecting shaft 203, so that the connecting shaft 203 cannot be separated from the connecting groove, which is not particularly limited herein.

The intermediate section then acts as an extension so that the support section can be located between the first discharge opening 7 and the float 201.

The support section may be an annular structure such that the flexible seal 302 may be formed within the annular structure, which may also support the flexible seal 302. Further, a support inner ring may further extend within the inner ring of the annular structure, and the support inner ring and the annular structure may be connected by a plurality of connectors, thereby supporting the middle portion of the flexible sealing element 302. The support section is arranged to enable the flexible sealing member 302 to have certain strength, and the basic shape of the flexible sealing member 302 can be supported, so that the flexible sealing member is not difficult to be separated from the top surface of the float 201 due to the self gravity.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.