KR101997393B1 - Multi-valve for fuel overcharging prevention - Google Patents

Abstract

The present invention provides a multi-valve for fuel injection for overcharging prevention of a gas fuel vehicle. An operating area of a cutoff shaft making up the multi-valve is reduced, and a force applied to the cutoff shaft by a fuel charging pressure and a flow velocity is reduced. A cutoff bush is independently operated from the cutoff shaft. Accordingly, a portion where the cutoff shaft and a cutoff cam come in contact with each other is reduced to prevent overcharging even if a fuel charging pressure is high. A gap between an outer circumference of the cutoff bush and an inner circumference of a body unit in a charge passage is reduced even if an elastic force of a cutoff spring is large. The cutoff bush is operated towards an outlet without being affected by the cutoff shaft to provide a returning capability of the cutoff shaft even when the fuel charging pressure is low. Overcharging is prevented by effective operation of the cutoff shaft, and an overcharging phenomenon caused by a different fuel charging pressure for each region or charging station is alleviated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a multi-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-valve applied to a fuel inlet of a vehicle using gas as a fuel (e.g., LPG, natural gas), and more particularly, Valve for preventing the overcharging of the gas-fueled vehicle, which can effectively prevent overcharging that occurs when the fuel pressure is high or low.

Generally, a gas-fueled vehicle using LPG or natural gas is composed of a fuel injection port for receiving fuel, a storage container for storing the fuel, and a liquid pipe (liquide pipe) connecting therebetween So that when the fuel is filled in the fuel charging station, the fuel is combined with the fuel injector and the fuel is stored in the storage container through the fuel inlet and the liquid pipe.

1 and 2, when a filler (not shown) is coupled to the fuel injection port 100 to float the float 200 in accordance with the amount of the charged fuel when the fuel is charged, the plate gear 300 and the pinion As the engagement rotational movement of the gear 400 is transmitted to the multi-valve 500, the opening of the multi-valve 500 can be made to fill the reservoir with fuel through the liquid pipe, And is disclosed in Korean Patent Registration No. 10-1686925 (registered on Dec. 20, 2016).

However, conventionally, there has been a problem in that overcharging occurs due to a difference in charging pressures for fuel for each region or charging station.

That is, when the fuel filling pressure is high, the friction between the operation shaft (or the cutoff shaft) constituting the multi-valve and the shaft disk (or the cutoff cam) severely occurs and overcharging occurs.

Further, when the fuel filling pressure is lower than the operating pressure of the multi-valve, the shaft disk is not operated and overcharging occurs.

On the other hand, when the elastic force of the flux valve spring (or the cutoff spring) is large in the part affected by the operating pressure of the multi-valve as described above, the overpressure occurs due to the increase in the operating pressure of the multi- When the elastic force of the flux valve spring is set to be small, the flux valve spring can be inserted between the shaft disk and the operation shaft, so that the return of the shaft disk after fuel buffering can not be performed properly.

Patent Registration No. 10-1686925 (registered on December 19, 2016)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a fuel cut- Valve for preventing the overcharging of the gas-fueled vehicle, which prevents friction between the cut-off shaft and the cut-off cam, thereby preventing overcharging even if the fuel filling pressure is high.

It is another object of the present invention to provide a cutoff bush which is independent from a cutoff shaft so that even when the elastic force of the cutoff spring is large, even when the fuel filling pressure is low while reducing the outer diameter of the cutoff bush and the inner diameter of the body, To prevent the overcharging of the gas-fueled vehicle by preventing the overfill by operating the cut-off shaft smoothly as well as returning the cut-off shaft to the exit side without being influenced by the cut-off shaft.

A fuel injection multi-valve for preventing overcharging of a gas fueled vehicle according to the present invention for achieving the above object is characterized in that a fuel injection port for inserting a fuel filler and a first charge flow passage are formed, housing; An inlet plug formed in the fuel inlet and having a second filling flow path for guiding the fuel to be filled in fuel filling through the fuel inlet to the first filling flow path; The second fill passage is formed in the second fill passage and moves in the first direction to open the second fill passage in accordance with the fuel filling pressure charged during fuel filling through the fuel inlet, A check valve for returning in a second direction opposite to the first direction so as to cut off the second filling passage so as to prevent fuel leakage; A cutoff cam having a fixed groove in which a float rises in accordance with the amount of fuel charged when the fuel is charged from the opening of the check valve, and the plate gear and the pinion gear are engaged and rotated in association with the rotational movement thereof; Off cam, and the metal sealing is performed while being in contact with the outer circumferential surface of the cut-off cam. When the fuel filling is completed, the end portion is inserted into the fixing groove of the cut- A cutoff shaft having a poppet valve formed on an outer circumferential surface thereof so as to block fuel filling through the filler channel and external leakage of the filler fuel through the first and second filler channels; And a control valve coupled to an outer circumferential surface of the other end of the cutoff shaft and moving in a first direction along an outer circumferential surface of the cutoff shaft in accordance with the filling pressure of the fuel when the check valve opens the second fill passage, Wherein the liquid pipe is connected to the first charge flow channel by returning in a second direction opposite to the first direction along the outer circumferential surface of the cutoff shaft after the fuel filling is completed, A cut-off bushing for blocking the inlet side; .

The other end of the check valve is coupled to the outer circumferential surface of the guide plug and guided in a first direction or a second direction opposite thereto. The guide plug has a guide groove into which one end of the cutoff shaft is inserted, Thereby forming a seating groove on which the valve is seated.

The check valve may include a first spring for returning the check valve in a second direction opposite to the first direction when the check valve is moved in the first direction according to the fuel filling, .

Further, on the outer peripheral surface of the other end of the cut-off shaft, the cut-off bush is compressed when the cut-off bush is moved in the first direction in accordance with the fuel filling, And a spring.

In the poppet valve, a boundary portion between the first charging passage and the second charging passage may be formed in the poppet valve so that when the cutoff shaft moves in the first direction and is blocked by the poppet valve, Thereby forming a pressure equalizing nozzle portion in which the inner pressure of the pressure equalizing portion is equalized.

The cut-off bushing may return in a second direction in accordance with return restoring force of the second spring when the internal pressure of the first fill passage and the second fill passage is equalized by the pressure equalizing nozzle portion.

Further, the cut-off bush is in contact with the inner diameter of the first fill passage and the contact portion which is in contact with the inner diameter of the first fill passage so that the cut-off bush can move independently from the filling pressure of the fuel along the outer peripheral surface of the other end of the cut- And a non-contact portion that maintains a constant gap.

In addition, a first sealing portion that is in contact with an inner circumferential surface of the valve housing is coupled to an outer circumferential surface of the inlet plug.

In addition, the outer circumferential surface of the check valve is formed with a second sealing portion which is in contact with the inner circumferential surface of the inlet plug when the check valve returns to the second direction after fuel buffering.

As described above, the present invention is configured to reduce the force applied to the cutoff shaft by the fuel filling pressure and the flow rate while reducing the operating area of the cutoff shaft constituting the multi-valve, as well as to make the cutoff bush operate independently of the cutoff shaft The friction between the cutoff shaft and the cutoff cam is reduced, thereby preventing overcharging even if the fuel filling pressure is high, and even if the elastic force of the cutoff spring is large, the outer diameter of the cutoff bush of the charging passage and the inner diameter gap Off-bushing can be operated to the outlet side without being influenced by the cut-off shaft even when the fuel filling pressure is low, so that the cut-off shaft can be returned to the outlet side, Improved pressure overcharge Would you expect the effect.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a fuel gauge in which a fuel injection multi-valve is installed to prevent overcharge.
2 is a perspective view showing a state in which a float floats according to a fuel filling amount;
FIG. 3 is an exploded perspective view of a multi-valve showing a state in which fuel is charged as an embodiment of the present invention. FIG.
FIG. 4 is a schematic plan view of a multi-valve showing a state in which fuel is charged according to an embodiment of the present invention. FIG.
5 is a side cross-sectional schematic view of a multi-valve showing a state in which fuel is charged according to an embodiment of the present invention.
6 is a partial enlarged view of a multi-valve according to an embodiment of the present invention.
FIG. 7 is an exploded perspective view of a multi-valve in which fuel filling is completed according to an embodiment of the present invention. FIG.
8 is a schematic plan view of a multi-valve showing a state in which fuel filling is completed according to an embodiment of the present invention.
9 is a side cross-sectional schematic view of a multi-valve showing a state in which fuel filling is completed according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view of a fuel gauge in which a fuel injection multi-valve is installed to prevent overcharge. FIG. 2 is a perspective view showing a floating state of a float according to a fuel filling amount. FIG. 4 is a plan view of a multi-valve in which fuel is charged according to an embodiment of the present invention, and FIG. 5 is a plan view of a multi-valve according to an embodiment of the present invention. FIG. 6 is a partially enlarged view of a multi-valve according to an embodiment of the present invention. FIG.

FIG. 7 is a perspective view of a multi-valve in which fuel filling is completed according to an embodiment of the present invention. FIG. 8 is a schematic plan view of a multi- 9 is a side cross-sectional schematic view of a multi-valve in which the fuel filling is completed according to an embodiment of the present invention.

Referring to FIGS. 1 to 9, a fuel injection multi-valve 500 for preventing overcharge of a gas fueled vehicle according to an embodiment of the present invention includes a valve housing 10, an inlet plug 20, Off cutter shaft 30, a cut-off cam 40, a cut-off shaft 50, a cut-off bush 60 and a guide plug 70.

The valve housing 10 has a fuel filler inlet 11 for inserting a fuel filler and a first filler channel 12. The first filler channel 12 is located at the inlet side of the liquid pipe P1, And guiding the fuel filled in the liquid pipe P1 and the storage container for storing fuel.

The inlet plug 20 is formed in the fuel inlet 11 and includes a second charging flow path 12 for guiding the fuel to be charged during fuel filling through the fuel inlet 11 to the first charging flow path 12 21).

Here, the inlet plug 20 has a first sealing portion 22 connected to an inner circumferential surface of the valve housing 10 on an outer circumferential surface thereof.

The check valve 30 is formed in the second filling passage 21 and opens the second filling passage 21 according to the fuel filling pressure charged when the fuel is injected through the fuel inlet 11 , And after the completion of the fuel filling, cut off of the second charging passage (21) is performed by the internal back pressure so as to prevent fuel leakage, In the second direction opposite to the first direction.

The check valve 30 is compressed on the outer peripheral surface of the check valve 30 when the check valve 30 is moved in the first direction according to the fuel filling. The first spring 31 for returning in two directions is coupled to the first seal 31 and the second seal 31 is connected to the inner circumferential surface of the inlet plug 20 when the check valve 30 is returned in the second direction after the fuel buffer, (32).

The cut-off cam 40 floats from the opening of the check valve 30 as shown in FIG. 2 attached with the float 200 of FIG. 1 attached according to the amount of fuel charged when the fuel is filled, And a fixing groove 41 in which the other end of the cutoff shaft 50 is inserted when the gear 400 rotates in conjunction with the rotation of the gear 400.

That is, the cutoff cam 40 is rotated in the direction in which the cutoff shaft 50 can be inserted into the fixing groove 41 according to the amount of fuel charged.

The cutoff shaft 50 is separated from the fixing groove 41 and contacts the outer circumferential surface of the cutoff cam 40 when the fuel is filled. The metal seal is formed at the time of filling the fuel, The first end of the fuel is inserted into the fixing groove 41 of the cut-off cam 40 and the fuel is charged through the second and first charging passages 21 and 12 and the first and second charging passages 12 and 21 so that the poppet valve 51 is formed on the outer peripheral surface of the one end of the cutoff shaft 50. [

The cut-off bush 60 is compressed when the cut-off bush 60 is moved in the first direction on the outer peripheral surface of the other end of the cut-off shaft 50 according to the fuel filling. After the completion of the fuel filling, the cut-off bush 60 and the cut- And a second spring 53 for returning in a second direction opposite to the first direction.

At this time, a boundary portion between the first charge flow path 12 and the second fill flow path 21 is formed in the poppet valve 51 so that the cutoff shaft 50 moves in the first direction to the poppet valve 51 The pressure equalizing nozzle unit 52 is formed so that the inner pressure of the first filling channel 12 and the inner pressure of the second filling channel 21 are equalized. When the inner pressure of the first charging passage (12) and the inner pressure of the second charging passage (21) are equalized by the second spring (52) .

The cut-off bushing 60 is coupled to the outer circumferential surface of the other end of the cut-off shaft 50 so that the check valve 30 is opened And moves in the first direction along the outer circumferential surface of the cutoff shaft 50 to open the inlet side of the liquid pipe P1 connected to the first charge flow path 12, And the second side of the liquid pipe P1 connected to the first charge flow path 12 is blocked.

At this time, the cut-off bushing 60 includes a contact portion 60a which is in contact with the inner diameter of the first fill passage 12 so as to be able to move independently from the filling pressure of the fuel along the outer peripheral surface of the other end of the cut- And has a non-contact portion 60b which is not in contact with the inner diameter of the first charging passage 12 but maintains a constant gap.

The check valve 30 is coupled to the outer circumferential surface of the guide plug 70 so that the check valve 30 can be rotated in the first direction or in the second direction opposite to the first direction It becomes movable.

A guide groove 71 in which one end of the cutoff shaft 50 is inserted and a seating groove 72 in which the poppet valve 51 is seated are formed at the other end of the guide plug 70.

As described above, the fuel injection multi-valve 500 for preventing the overcharging of the gas-fueled vehicle according to the embodiment of the present invention is provided with the valve housing 10 The check valve 30 coupled to the inlet plug 20 in the fuel inlet 11 is inserted into the fuel inlet 11 of the fuel inlet 11 through the outer circumferential surface of the guide plug 70 And moves in the first direction while compressing the first spring 31 to open the second charge flow passage 21 in the inlet plug 20.

One end of the cutoff shaft 50 is inserted into the guide groove 71 of the guide plug 70 and the poppet valve 51 formed on the outer peripheral surface of the one end of the cutoff shaft 50 is inserted into the guide plug 70 The other end of the cutoff shaft 50 is in contact with the outer circumferential surface of the cutoff cam 40 and is metal sealed so that the second filler channel 21 are introduced into the first filling flow path 12 formed in the valve housing 10. [

The cut-off bush 60, which is connected to the outer peripheral surface of the other end of the cut-off shaft 50 and blocks the inlet side of the liquid pipe P1 according to the filling pressure of the fuel flowing into the first fill passage 12, 2 spring 53 is moved in the first direction along the outer peripheral surface of the cutoff shaft 50 to open the inlet side of the liquid pipe P1 connected to the first filler channel 12, Can be filled into the storage container through the liquid pipe P1.

At this time, the cutoff shaft 50 reduces the operating area according to the movement of the cut-off bushing 60 and reduces the force applied to the cutoff shaft 50 by the fuel filling pressure and the flow rate of the fuel to be filled Even if the other end of the cutoff shaft 50 contacts the outer circumferential surface of the cutoff cam 40 for metal sealing, the friction due to the contact can be reduced, Fuel overload into the storage container can be prevented.

The contact portion 60a of the cut-off bushing 60 is in contact with the inner diameter of the first fill passage 12 and the non-contact portion 60b is not in contact with the inner diameter of the first fill passage 12 Even if the elastic force of the second spring 53 supporting the cut-off bushing 60 is set to be large on the outer peripheral surface of the cut-off shaft 50, the cut- Even when the filling pressure of the fuel is low, it is possible to move in the first direction along the outer circumferential surface of the cut-off shaft 50, thereby preventing overcharge of fuel to the storage container.

As shown in FIG. 1, when the fuel is filled into the storage vessel through the liquid pipe P1, the float 200 floats as shown in FIG. 2, The plate gear 300 and the pinion gear 400 are engaged and rotated according to the lifting action of the plate gear 300 and the pinion gear 400 and the cut- do.

The rotation of the cutoff cam 40 causes the fixing groove 41 to face the other end of the cutoff shaft 50 so that the other end of the cutoff shaft 50 enters the fixing groove 41 , The cutoff shaft 50 moves in the first direction.

At this time, since the poppet valve 51 is formed at one end of the cutoff shaft 50, the poppet valve 51 is moved in the direction of movement of the cutoff shaft 50, Thereby preventing the charged fuel from leaking while blocking the boundary portion of the fuel tank 12.

When the boundary between the second filling passage 21 and the first filling passage 12 is blocked by the poppet valve 51, the pressure equalizing nozzle portion 52 formed in the poppet valve 51 The inner pressure of the first charging passage 12 and the inner pressure of the second charging passage 21 can be equalized.

7 to 9, when the inner pressure of the first charging passage 12 and the inner pressure of the second charging passage 21 are equalized, the returning force of the second spring 53 The cut-off bushing 60 is moved in a second direction (left direction) opposite to the first direction along the outer circumferential surface of the cut-off shaft 50 so that the cut- Thereby blocking the inlet side.

The check valve 30, which is coupled to the outer circumferential surface of the guide plug 70 and moved in the first direction, moves in the second direction opposite to the first direction in accordance with the returning force of the first spring 31, , The second charge flow path (21) of the inlet plug (20) is shut off, and the fuel filling is terminated.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be easy to understand. It is also to be understood that the technical spirit of the invention is also deemed to belong to the scope of the appended claims if the practice of such improvements, alterations, substitutions or additions falls within the scope of the appended claims.

10; Valve housing 11; Fuel inlet
12; A first charging passage 20; Inlet plug
21; A second charging passage 22; The first sealing part
30; Check valve 31; The first spring
32; A second sealing portion 40; Cutoff cam
41; A fixing groove 50; Cutoff shaft
51; Poppet valve 52; The pressure-
53; A second spring 60; Cutoff bush
60a; Contact portion 60b; Noncontact portion
70; A guide plug 71; Guide groove
72; A seating groove 200; pontoon
300; Plate gear 400; Pinion gear
500; Multi valve

Claims (9)

A valve housing having a fuel filler inlet for inserting the fuel filler and a first filler passage formed therein, the valve housing being connected to a storage container for storing fuel and a liquid pipe;
An inlet plug formed in the fuel inlet and having a second filling flow path for guiding the fuel to be filled in fuel filling through the fuel inlet to the first filling flow path;
The second fill passage is formed in the second fill passage and moves in the first direction to open the second fill passage in accordance with the fuel filling pressure charged during fuel filling through the fuel inlet, A check valve for returning in a second direction opposite to the first direction so as to cut off the second filling passage so as to prevent fuel leakage;
A cutoff cam having a fixed groove in which a float rises in accordance with the amount of fuel charged when the fuel is charged from the opening of the check valve, and the plate gear and the pinion gear are engaged and rotated in association with the rotational movement thereof;
Off cam, and the metal sealing is performed while being in contact with the outer circumferential surface of the cut-off cam. When the fuel filling is completed, the end portion is inserted into the fixing groove of the cut- A cutoff shaft having a poppet valve formed on an outer circumferential surface thereof so as to block fuel filling through the filler channel and external leakage of the filler fuel through the first and second filler channels; And
And a check valve which is connected to an outer circumferential surface of the other end of the cutoff shaft and moves in a first direction along an outer circumferential surface of the cutoff shaft in accordance with a filling pressure of the fuel when the check valve is moved to open the second fill conduit, Wherein the liquid pipe has an inlet side opened and after returning to a second direction opposite to the first direction along the outer circumferential surface of the cutoff shaft after completion of fuel filling, Off-off bushing to cut off the bushing; Wherein the fuel injection valve is configured to prevent overcharging of the gas-fueled vehicle. The method according to claim 1,
The other end of the check valve is guided in a first direction or a second direction opposite thereto while being coupled to the outer circumferential surface of the guide plug, and the guide plug has a guide groove into which one end of the cutoff shaft is inserted, Wherein the gas-fueled vehicle is provided with a seating groove on which the gas-fueled vehicle is mounted. The method according to claim 1,
And a first spring for returning the check valve in a second direction opposite to the first direction when the fuel is charged, and a second spring for returning the check valve in a second direction opposite to the first direction, And the fuel injection valve is configured to prevent overcharging of the gas-fueled vehicle. The method according to claim 1,
And a second spring for returning the cut-off bush in a second direction opposite to the first direction after the cut-off bush is moved in the first direction according to the fuel filling, and after the fuel filling is completed, on the outer peripheral surface of the other end of the cut- Fuel valve and the gas-fueled vehicle. The method according to claim 1,
Wherein the poppet valve is provided with a poppet valve that is provided at the boundary between the first fill passage and the second fill passage when the cutoff shaft moves in the first direction and is blocked by the poppet valve, And a pressure equalizing nozzle portion is formed so that the pressure is equalized. 6. The method of claim 5,
Wherein the cut-off bush is moved in the second direction in accordance with the returning restoring force of the second spring when the inner pressure of the first fill passage and the second fill passage is equalized by the pressure equalizing nozzle portion Multi-valve for fuel injection to prevent overfilling of gas-fueled vehicles. The method according to claim 1,
Wherein the cut-off bush has a contact portion that is in contact with an inner diameter of the first fill passage so that the cut-off bush can independently move along the outer peripheral surface of the other end of the cut-off shaft from the filling pressure of the fuel, And a non-contact portion that maintains a constant gap. The method according to claim 1,
And a first sealing portion contacting the inner circumferential surface of the valve housing is coupled to an outer circumferential surface of the inlet plug. The method according to claim 1,
And a second sealing portion which is in contact with the inner circumferential surface of the inlet plug when the check valve is moved back in the second direction after the fuel buffering is connected to the outer circumferential surface of the check valve. Multi-valve.

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