KR100718849B1 - Return valve for gas automobile's fuel feeding system - Google Patents

Abstract

A return valve of a fuel supply device for a gas fuel vehicle is disclosed. A valve housing having a flow path connected to the connection pipe; A valve which is provided to be liftable in the flow path of the valve housing to open and close the opening of the flow path, and a bottom surface of which has a plunger protruding from the valve housing; A closing cap fixedly coupled to a lower portion of the valve housing spaced from the valve, and having a plurality of discharge holes radially perforated at one side thereof; An elastic means provided between the closing cap and the valve and formed of a compression spring for elastically supporting the valve; A fuel supply for a gas fuel vehicle, comprising: a closing nipple coupled to and fixed to a central portion of the closing cap spaced from the discharge port to support the elastic means, and the plunger of the valve being elevated during operation of the return valve is inserted into and guided through a through hole at the center thereof. In the return valve of the apparatus, the upper portion of the valve is further formed with a predetermined protrusion inserted into the flow path.

Gas, fuel, return valve, recovery, gas phase, liquid phase

Description

RETURN VALVE FOR GAS AUTOMOBILE'S FUEL FEEDING SYSTEM}

1 to 4 are views of a fuel supply device and a return valve for a conventional gas fuel vehicle.

5A and 5B are views of a return valve of a fuel supply device for a gas fuel vehicle according to the present invention.

6 is a view showing in detail the operating state of the return valve of the fuel supply device for a gas fuel vehicle according to the present invention.

7 shows another embodiment of the present invention.

8 is a view showing still another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

63: valve 65: plunger

90: protrusion 92: discharge groove

95: packing member

The present invention relates to a return valve of a fuel supply device for a gas fuel vehicle, and more particularly, to a return valve of a fuel supply device for a gas fuel vehicle to prevent chattering to prevent noise generation during idle operation.

In general, an internal combustion engine of a gas vehicle burns a mixer sucked into a combustion chamber, and linearly reciprocates a piston with the explosive force generated therefrom, and converts its linear reciprocating motion into a rotational motion as a crank mechanism to obtain rotational power. The engine of a vehicle is representative.

The engine of such a gas vehicle liquefies and stores LPG fuel or natural gas fuel in a cylinder, which is a fuel tank, at a predetermined pressure, and supplies liquid fuel to the engine by a submerged fuel pump, and after the injection by an injector, vaporizes the engine during operation. A mixture of liquid and gaseous conditions is returned to the bomb

In the fuel supply device of such a conventional gas fuel vehicle, as described in Korean Patent Application No. 10-2003-83990, the applicant of the present application, the abnormal noise due to the explosion of the phase-change gaseous fuel and the friction caused by the valve flow attenuation Return valve is provided.

The fuel supply device and the return valve of the conventional gas fuel vehicle will be described with reference to FIGS. 1 and 2 as follows.

First, the conventional fuel supply device is composed of a multi-valve 10 and the fuel pump 50, as shown in FIG.

The multi-valve 10 is composed of a disc-shaped base plate 11 and a valve block 12 protruding from the base plate, and the base plate 11 is inclined at approximately 35 degrees to the fuel tank.

In addition, a supply passage 13 and a return passage 14 through which fuel flows are formed on the upper surface of the base plate 11, that is, the valve block 12 opposite to the fuel tank.

In addition, one end of the return passage 14 located in the fuel tank is provided with a bolt-type nipple 20 is coupled.

On the other hand, instead of closing one end of the return passage 14 communicating with the fuel tank, the bolt-shaped nipple 20 has a flow path 21 bent in a substantially " b " shape at the top thereof located in the return passage 14. And to bypass fuel flowing through the return flow passage 14 to one side.

In addition, one end of the hollow connection pipe 30 is connected to the flow path 21 of the bolt-shaped nipple 20 through a connection nipple 32. The other end of the connecting pipe 30 is connected to the flow path 62 of the return valve 60 installed on the bottom surface of the base plate 11 via another connecting nipple 33.

The connecting pipe 30 is composed of a rubber material to primarily attenuate abnormal noise and vibration noise caused by the fuel re-introduced into the fuel tank, more preferably formed of a rubber hose.

In addition, a lower surface of the base plate 11 of the multi-valve 10 is provided with a connection plate 40 spaced apart from each other by a predetermined distance, and the connection bar supports the multi-valve 10 with the fuel pump 50. One end of the 41 is integrally formed, and the other end of the support bar is integrally formed on the connecting plate 51 fixed to the fuel pump 50.

Here, reference numeral 42 denotes a supply pipe connecting the supply passage 13 of the multi-valve 10 to the fuel pump 50, and reference numeral 43 denotes a tank pressure acting on the diaphragm in the fuel pump 50. It shows the air flow tube communicated with the atmosphere so that.

And, the base plate 52 is fixed to the fuel pump 50 on the lower surface of the connecting plate 51, the damper 53 is provided on the base plate 52 and the connecting plate 51, the fuel pump And to attenuate the vibration and noise of 50.

Here, the fuel pump 50 is the same as or similar to the known configuration, a detailed description thereof will be omitted.

And, as shown in Figure 2, the return valve 60, the valve housing 61 having a flow path 62 is connected to the connecting pipe 30 in communication with, and is provided to be elevated in the flow path of the valve housing. And the opening and closing of the flow path 62, and a lower surface of the valve 63 having a plunger 65 protruding from the lower surface of the valve housing 61 and a lower portion of the valve housing 61 spaced apart from the valve. A closing cap 66 having a plurality of discharge openings 67 formed therein, an elastic means 68 formed between the closing cap and the valve to elastically support the valve 63, and spaced apart from the discharge opening 67. The plunger 65 of the valve 63, which is lifted and lowered during operation of the return valve 60, is inserted into the through-hole 72 at the center thereof. It includes a guide nipple 71 to be guided.

The closing cap 66 is formed at the lower end of the conical head portion 69 having a diameter that can cover all of the discharge port 67 of the closing cap 66 is integrally formed, the upper surface of the head portion discharge port 67 It is formed as an inclined surface 70 inclined downward to scatter the return fuel discharged through the fuel into the fuel tank.

In addition, the upper surface of the valve 63, a packing member 64 made of a rubber (Rubber) material is provided to open and close the flow path 62 of the valve housing 61.

And, the return valve 60, the upper end is provided via the rubber cap 73 on the lower surface of the base plate 11 of the multi-valve 10, the gas phase fuel in the liquid fuel in the return valve 60 Vibration noise generated while blowing is absorbed and sound-shielded by the rubber cap 73 is prevented from spreading the noise to the outside through the base plate (11).

Looking at the operation of the conventional return valve 60, the remaining liquid fuel that is not supplied to the combustion chamber of the engine and re-introduced into the fuel tank through the regulator, the pressure is reduced while passing through the regulator, the engine of the high temperature according to the operating conditions of the engine As the temperature rises due to the radiant heat of the and surrounding devices, some of the liquid fuel re-introduced into the fuel tank is vaporized and flows into the fuel tank through the return passage while being mixed with the liquid fuel.

At this time, the above-described gaseous fuel flows into the flow path 62 when the liquid fuel is reflowed due to being present as a bubble in the liquid fuel or the liquid fuel in the fuel tank, and then passes between the opening and the packing member 95. Noise is generated from the rear seats during idling of the vehicle by causing chattering.

That is, when a part of the bubble fuel is expelled, the force that presses the valve 63 is released at the same time, the valve 63 is raised by the repulsive force of the elastic means 68, the packing member 95 and the flow path 62 ) Openings are in contact, and as the contact is frequent, noise caused by chattering is generated.

The noise generated in this manner is gradually increased while resonating, and there is a problem of spreading.

In order to solve the above problems of the prior art, the applicant has filed a Korean Patent Application No. 2004-2529, "Return valve of a fuel supply device for a gas fuel vehicle."

In brief,

A multi-valve 10 connected to the fuel pump 50 and having supply and return flow paths 13 and 14 through which the fuel flows, and a return valve 100 connected to the return flow path 14 of the multi-valve 10. In the fuel supply device for a gas fuel vehicle comprising a, the return valve 100, the valve housing having a flow path 111 connected to the connection pipe 30 on one side; A valve 120 for opening and closing the flow path 111 of the valve housing 110; The valve 120 is coupled to and fixed to a lower portion of the valve housing 110 spaced apart from each other, and a plurality of discharge holes 144 are formed at one side thereof, and a discharge hole 144 is covered at a center lower surface thereof spaced apart from the discharge hole 144. Closing head 140 is formed integrally with the closing cap 140; And an elastic means 130 provided between the closing cap 140 and the valve 120 to elastically support the valve 120.

In addition, the return valve 100 is coupled to the base plate 11 of the multi-valve 10 via a rubber cap 112.

In addition, one surface of the head portion 141 facing the discharge port 144 is formed as an inclined surface 142 gradually inclined downward from the center to the outer peripheral side, thereby effectively scattering the fuel returned into the fuel tank. .

The elastic means 130 is a compression coil spring, both ends of which are fitted into the mounting protrusions 121 protruding from the bottom surface of the valve 120 and the mounting protrusions 143 protruding from the upper surface of the closing cap 140, respectively. Can be done.

In addition, the valve 120 is made of a rubber material having good airtightness, and an insertion protrusion 150 that is inserted and guided spaced apart from the flow path 111 of the valve housing 110 as shown in FIG. 4 on its upper surface. ) Is formed to protrude.

In addition, on the outer circumferential surface of the valve 120, a plurality of support protrusions 122 radially minimize the frictional resistance during contact with the flow passage 111 during operation while securing the flow passage 111 with the valve housing 110. Spacing is formed.

Referring to the operation of the return valve of the present invention configured as described above are as follows.

The liquid fuel in the fuel tank is supplied to the combustion chamber of the engine by the fuel pump 50, and the remaining liquid fuel which is not supplied to the combustion chamber is decompressed and phase-changed into gaseous fuel by radiant heat and mixed with the liquid fuel. It flows into the return flow path 14 of).

The fuel introduced into the return passage 14 passes through the bolt-shaped nipple 20 and the connecting nipple 32 and into the connecting pipe 30, so that abnormal noise and vibration noise caused by the fuel are connected to the connecting pipe 30 of rubber material. By primary absorption and attenuation.

In addition, the fuel passing through the connecting pipe 30 passes through the other connecting nipple 33 to the valve housing 110 flow path 111 of the return valve 100, the pressure of the fuel than the elastic force of the elastic means 130 When acting on the valve 120 with a large force, the valve 120 compresses and descends the elastic means 130 to open the flow path 111 of the valve housing 110.

At this time, the valve 120 operated as described above may be eccentric in the flow path 111 of the valve housing 110. When the valve 120 is eccentric, the support protrusion 122 formed on the outer circumferential surface of the valve 120 may have a valve housing ( Since only the local contact with the flow path 111 of the 110, the friction noise is significantly reduced compared to the conventional valve 63 while achieving a stable operation chattering phenomenon is also prevented.

On the other hand, the fuel passing through the valve 120 along the flow path 111 of the open valve housing 110, the inclined surface of the head portion 141 through a plurality of discharge holes 144 formed radially in the closing cap 140 ( 142 is discharged into the fuel tank.

Therefore, the dispersed gaseous fuel is condensed on the inner side of the fuel tank, causing condensation, or floating in the air without being directly mixed with the liquid fuel in the fuel tank and phase-changing into liquid fuel, or the liquid fuel in the fuel tank. As the gaseous fuel falls down and mixes on the water surface, the boiling abnormal noise of fuel generated in the fuel tank is minimized.

On the other hand, as another prior art is disclosed in the Republic of Korea Utility Model Registration No. 20-345553 "Return valve for the LLP vehicle".

If you look at it,

A valve body having a predetermined fuel moving space therein and having an opening formed on at least one side thereof; A return basin, one end of which is connected to the engine side and the other end of which is inserted into the valve body and whose insertion end communicates with the fuel movement space; A shaft movably disposed in an internal fuel movement space of the valve body to selectively control movement of fuel introduced into the fuel movement space through the return basin toward the opening; The valve body having a body portion having a fuel return hole formed on a plate surface along a moving direction of the shaft, and an inclined portion integrally formed with the body portion and having an inclined guide surface inclined to guide the fuel returned from the fuel return hole; A nipple coupled to an opening of the nipple; A bush disposed between the nipple and the shaft to support the shaft; And a return spring for returning the shaft to its original position.

As shown in FIG. 3, the return valve 4 includes a valve body 10, a return branch 20, a shaft 30, a nipple 40, a bush 50, a return spring 60, and It consists of a stopper 70.

The valve body 10 is a part which forms the body of the return valve 4, and based on FIG. 3, the upper surface is closed and the lower surface is opened to form an open part (not shown). Inside the valve body 10, a fuel moving space 10a in which fuel introduced from the return basin 20 is temporarily stored and moved is formed.

The return basin 20 coupled to the side of the valve body 10 has one end connected to the engine 3 side and the other end inserted into the valve body 10 so that the insertion end is inserted into the fuel movement space 10a. In communication with Therefore, the liquid LLP fuel flows into the engine 3 and rides as much as it rides through the return basin 20 into the fuel movement space 10a in the valve body 10.

The shaft 30 is provided in the fuel movement space 10a. The shaft 30 consists of the long rod-shaped shaft part 31 and the head part 32 formed in the edge part of the shaft part 31 according to the position. On the inner surface of the valve body 10 adjacent to the surface of the head portion 32, an opening and closing rib 10b protruding toward the head portion 32 is provided.

Therefore, when the shaft 30 is upward and the surface of the head portion 32 contacts the opening / closing rib 10b, the fuel lying in the fuel movement space 10a does not move toward the nipple 40, and the shaft 30 is When the surface of the head 32 is lowered and spaced apart from the opening / closing rib 10b, the fuel lying in the fuel movement space 10a is directed toward the nipple 40.

As a result, the shaft 30 serves to selectively control the movement of the fuel introduced into the fuel movement space 10a through the return branch 20 toward the opening side. At this time, the downward force of the shaft 30 is the pressure of the fuel flowing into the fuel movement space (10a) of the valve body 10 through the return basin 20, if this force is removed to the return spring (60) As a result, the shaft 30 is returned upward to its original position. Therefore, it is preferable that the return spring 60 is a compression spring in which both ends are arranged in the head part 32 and the nipple 40, respectively.

The nipple 40 is inclined to guide the body portion 41 in which the fuel return hole 41a is formed along the moving direction of the shaft 30 on the plate surface and the fuel returned from the fuel return hole 41a according to its position. And an inclined portion 42 having an inclined guide surface 42a and a connecting portion 43 for connecting between the body portion 41 and the inclined portion 42.

Of course, the shorter the length of the connecting portion 43, the less noise that the fuel returned through the fuel return hole 41a hits the inclined surface. Therefore, in some cases, the connecting portion 43 may not be formed. On the other hand, the nipple 40 of the body portion 41, the inclined portion 42 and the connecting portion 43 may be formed integrally by a single material, the airtightness between the nipple 40 and the valve body 10 O-rings (O, ORing) are provided.

The bush 50 is disposed between the nipple 40 and the shaft 30 to support the shaft portion 31 of the shaft 30. The inner end of the bush 50 has a hook shape, and a predetermined inner jaw is formed in a portion of the outer end. The outer end 50a is fitted with an end portion of the stopper 70 which prevents the bush 50 from being separated from the nipple 40.

With this arrangement, as illustrated in FIG. 4, when the vehicle is started, the pump 8 first operates to pump the LPI fuel. The pumped fuel is first passed through the check valve (5), and then flows into the engine (3) through the manual valve (2), regulator (7a) via a relief valve (6) is set to about 20kg / cm 2 Enter into the administration.

In this process, in order for the liquid LPG fuel to flow into the engine 3 and ride as it is, the rest of the fuel is recovered back into the tank 1. First, the remaining fuel is returned to the fuel in the valve body 10 through the return basin 20. It flows into the moving space 10a.

By the pressure of the incoming fuel, the shaft 30 moves downward and the return spring 60 is compressed. Then, since the surface of the head portion 32 of the shaft 30 is spaced apart from the opening and closing rib 10b, the fuel introduced into the fuel movement space 10a in the valve body 10 through the return basin 20 is downwardly nippled ( Reaches 40).

Then, while passing through the fuel return hole (41a) formed in the body portion 41 of the nipple 40, the inclination is guided flexibly by the inclined portion 42, the noise is offset and can be recovered into the tank (1). have.

Next, when the remaining fuel is recovered in the tank 1, the return spring 60, which has been compressed, moves upward while restoring to the original state. Thus, by pressing the head portion 32 upward, the surface of the head portion 32 contacts the opening / closing rib 10b to seal the space therebetween, thereby completing the return process of the fuel.

However, there is a problem in that abnormal noise is still generated because the chattering phenomenon generated in the return valve is not completely prevented even through the above-described prior art.

The present invention has been made in order to solve the above problems of the prior art, while lowering the valve by the inflow of the recovered fuel, while the gap between the packing member of the valve and the valve seat is increased to suppress chattering noise It is an object of the present invention to provide a return valve of a fuel supply device for a gas fuel vehicle so as to minimize generation.

The present invention to achieve the above object,

A valve housing having a flow path connected to the connection pipe; A valve which is provided to be liftable in the flow path of the valve housing to open and close the opening of the flow path, and a bottom surface of which has a plunger protruding from the valve housing; A closing cap fixedly coupled to a lower portion of the valve housing spaced from the valve, and having a plurality of discharge holes radially perforated at one side thereof; An elastic means provided between the closing cap and the valve and formed of a compression spring for elastically supporting the valve; A fuel supply for a gas fuel vehicle, comprising: a closing nipple coupled to and fixed to a central portion of the closing cap spaced from the discharge port to support the elastic means, and the plunger of the valve being elevated during operation of the return valve is inserted into and guided through a through hole at the center thereof. In the return valve of the device, the upper portion of the valve is further formed a predetermined protrusion inserted into the flow path,

The side of the protrusion is characterized in that a plurality of predetermined discharge grooves are formed from the top to the bottom.

In addition, the discharge groove is characterized in that it is formed inclined.

In addition, the discharge groove is characterized in that it is formed vertically.

In addition, the discharge groove is characterized in that the inclined but formed in a curved shape.

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

5A and 5B are views illustrating a return valve of a fuel supply device for a gas fuel vehicle according to the present invention.

A general fuel supply device is composed of a multi-valve 10 and a fuel pump 50, as shown in Figure 5a.

The multi-valve 10 is composed of a disc-shaped base plate 11 and a valve block 12 protruding from the base plate, and the base plate 11 is inclined at approximately 35 degrees to the fuel tank.

In addition, a supply passage 13 and a return passage 14 through which fuel flows are formed on the upper surface of the base plate 11, that is, the valve block 12 opposite to the fuel tank.

In addition, one end of the return passage 14 located in the fuel tank is provided with a bolt-type nipple 20 is coupled.

On the other hand, instead of closing one end of the return passage 14 communicating with the fuel tank, the bolt-shaped nipple 20 has a flow path 21 bent in a substantially " b " shape at the top thereof located in the return passage 14. And to bypass fuel flowing through the return flow passage 14 to one side.

In addition, one end of the hollow connection pipe 30 is connected to the flow path 21 of the bolt-shaped nipple 20 through a connection nipple 32. The other end of the connecting pipe 30 is connected to the flow path 62 of the return valve 60 installed on the bottom surface of the base plate 11 via another connecting nipple 33.

The connecting pipe 30 is composed of a rubber material to primarily attenuate abnormal noise and vibration noise caused by the fuel re-introduced into the fuel tank, more preferably formed of a rubber hose.

In addition, a lower surface of the base plate 11 of the multi-valve 10 is provided with a connection plate 40 spaced apart from each other by a predetermined distance, and the connection bar supports the multi-valve 10 with the fuel pump 50. One end of the 41 is integrally formed, and the other end of the support bar is integrally formed with the connecting plate 51 fixed to the fuel pump 50.

And, the base plate 52 is fixed to the fuel pump 50 on the lower surface of the connecting plate 51, the damper 53 is provided on the base plate 52 and the connecting plate 51, the fuel pump And to attenuate the vibration and noise of 50.

On the other hand, the return valve 60 of the present invention, as shown in Figure 5b,

A valve housing 61 having a flow path 62 to which the connecting pipe 30 is connected; A valve (63) provided to be movable up and down in the flow path of the valve housing (61) to open and close the opening of the flow path (62), and a plunger (65) protruding from the bottom surface thereof; A closing cap 66 coupled to and fixed to a lower portion of the valve housing 61 spaced apart from the valve 63, and having a plurality of discharge holes 67 radially punched at one side thereof; An elastic means (68) provided between the closing cap (66) and the valve (63) and made of a compression spring to elastically support the valve (63); The plunger 65 of the valve 63, which is fixedly coupled to the central portion of the closing cap 66 spaced apart from the discharge port 67, supports the elastic means 68 and is elevated during operation of the return valve 60. A configuration including a closing nipple 71 inserted into and guided through the through hole 72 follows as a basic configuration.

According to the present invention, the upper portion of the valve 63 is further formed with a circular protrusion 90 inserted into the opening of the aforementioned flow path 62.

The protrusion 90 has a cylindrical shape of a rubber material, and the diameter thereof is smaller than the diameter of the flow path 62 so as not to be in close contact with the sidewall of the flow path 62.

In addition, the outer circumferential surface of the protrusion 90 is formed with a discharge groove 92 having a predetermined depth from the upper end to the lower end.

A plurality of discharge grooves 92 are formed on the outer circumferential surface of the protrusion 90 and are inclined to have a predetermined inclination.

Referring to the operating relationship of the present invention configured as described above are as follows.

6 is a view showing in detail the operating state of the return valve of the fuel supply device for a gas fuel vehicle according to the present invention.

The fuel recovered through the flow path 62 (with the liquid phase and the gaseous state mixed) lowers the valve 63 by pressing the protrusion 90 to open the opening of the flow path 62.

At this time, some of the above-described fuel is transported by the discharge groove 92, it is possible to provide the effect of increasing the force to eventually lower the valve 63 by the pressure generated at this time, which is an elastic means (68) By providing a pressing force greater than the repulsion force of the valve, the width at which the valve 63 is lowered can be much increased.

Therefore, in the present invention, even when there is a moment in which the fuel in the bubble state bursts, the lowered width of the valve 63 is deep, so that the subsequent fuel is lifted before the valve 63 is raised by the repulsive force of the elastic means 68. Since the valve 63 descends continuously due to the inflow, the opportunity for contact between the packing member 95 and the opening of the flow path 62 can be minimized, and chattering can be prevented.

On the other hand, Figure 7 is a diagram showing another embodiment of the present invention.

Referring to this, another embodiment of the return valve 60, as shown in Fig. 7, the valve housing 61 having a flow path 62 connected to the connecting pipe 30 in communication; A valve (63) provided to be movable up and down in the flow path of the valve housing (61) to open and close the opening of the flow path (62), and a plunger (65) protruding from the bottom surface thereof; A closing cap 66 coupled to and fixed to a lower portion of the valve housing 61 spaced apart from the valve 63, and having a plurality of discharge holes 67 radially punched at one side thereof; An elastic means (68) provided between the closing cap (66) and the valve (63) and made of a compression spring to elastically support the valve (63); The plunger 65 of the valve 63, which is fixedly coupled to the central portion of the closing cap 66 spaced apart from the discharge port 67, supports the elastic means 68 and is elevated during operation of the return valve 60. A closing nipple 71 inserted into the through hole 72 and guided thereto; and a circular protrusion 90 inserted into the opening of the aforementioned flow path 62 is further formed on the upper portion of the valve 63. do.

On the outer circumferential surface of the protrusion 90, a discharge groove 92 'having a predetermined depth is formed in a vertical shape from the upper end to the lower end.

The aforementioned discharge grooves 92 ′ are divided into four equal parts by dividing the outer circumferential surface of the protruding portion 90, respectively, and a total of four discharge grooves 92 ′ are formed.

Alternatively, a total of eight discharge grooves 92 'are formed by dividing the outer circumferential surface of the protrusion 90 into eight equal parts.

Since the discharge groove 92 'of the vertical shape described above has a very fast moving speed of the fuel passing therein, the force for pressing the valve 63 may be slightly weak, so that the discharge groove 92' is corrected. Form as many as possible.

The operation of the other embodiments described above will be described.

The fuel recovered through the flow path 62 (with the liquid phase and the gaseous phase mixed) lowers the valve 63 by pressing the protrusion 90 to open the opening of the flow path 62.

At this time, some of the above-described fuel is transported by the discharge groove (92 '), it is possible to provide the effect of increasing the force to eventually lower the valve 63 by the pressure generated at this time, which is an elastic means ( By providing a pressing force greater than the repulsive force of 68, the width at which the valve 63 is lowered can be increased even more.

Therefore, in the present invention, even when there is a moment in which the fuel in the bubble state bursts, the lowered width of the valve 63 is deep, so that the subsequent fuel is lifted before the valve 63 is raised by the repulsive force of the elastic means 68. Since the valve 63 descends continuously due to the inflow, the opportunity for contact between the packing member 95 and the opening of the flow path 62 can be minimized, and chattering can be prevented.

On the other hand, Figure 8 is a view showing another embodiment of the present invention.

Referring to this, another embodiment of the present invention, as shown in Figure 8, the valve housing having a flow path 62 connected to the connecting pipe 30 in communication; A valve (63) provided to be movable up and down in the flow path of the valve housing (61) to open and close the opening of the flow path (62), and a plunger (65) protruding from the bottom surface thereof; A closing cap 66 coupled to and fixed to a lower portion of the valve housing 61 spaced apart from the valve 63, and having a plurality of discharge holes 67 radially drilled on one side thereof; An elastic means (68) provided between the closing cap (66) and the valve (63) and made of a compression spring to elastically support the valve (63); The plunger 65 of the valve 63, which is fixedly coupled to the central portion of the closing cap 66 spaced apart from the discharge port 67, supports the elastic means 68 and is elevated during operation of the return valve 60. A closing nipple 71 inserted into the through hole 72 and guided thereto; and a circular protrusion 90 inserted into the opening of the aforementioned flow path 62 is further formed on the upper portion of the valve 63. do.

On the outer circumferential surface of the protrusion 90, the discharge groove 92 "having a predetermined depth is inclined obliquely from the upper end to the lower end, but is formed to be curved.

A plurality of discharge grooves 92 ″ are formed on the outer circumferential surface of the protrusion 90, and preferably, one discharge groove 92 ″ is formed at 0 °, 90 °, 180 °, and 270 °, respectively, to form a total of four.

Since the discharge groove 92 ″ is formed to be curved, the residence time of the fuel passing therein becomes longer, and thus the force for pressing the valve 63 may be further strengthened.

Therefore, the valve can be lowered more deeply, and also the valve 63 lowered state can be continuously maintained due to the subsequent inflow of fuel before the valve 63 is raised by the repulsive force of the elastic means 68. Therefore, since the contact between the packing member 95 and the opening of the flow path 62, which has been the cause of the conventional chattering, can be significantly reduced, it is possible to prevent chattering.

Another embodiment of the present invention is described above.

The fuel recovered through the flow path 62 (with the liquid phase and the gaseous state mixed) lowers the valve 63 by pressing the protrusion 90 to open the opening of the flow path 62.

At this time, some of the above-described fuel is transported in the discharge groove (92 "), it is possible to provide the effect of increasing the force to eventually lower the valve 63 by the pressure generated at this time, which is an elastic means ( By providing a pressing force greater than the repulsive force of 68, the width at which the valve 63 is lowered can be increased even more.

Therefore, in the present invention, even when there is a moment in which the fuel in the bubble state bursts, the lowered width of the valve 63 is deep, so that the subsequent fuel is lifted before the valve 63 is raised by the repulsive force of the elastic means 68. Since the valve 63 descends continuously due to the inflow, the opportunity for contact between the packing member 95 and the opening of the flow path 62 can be minimized, and chattering can be prevented.

On the other hand, although not shown in the drawings may be variously modified the shape of the discharge groove.

That is, such as a " ∫ " shape or a "┏┛" shape, the middle may be formed in a bent shape, and when the bent portion is horizontal, the flow of fuel may be cut off, so that an inclination that is less than the horizontal is possible. It is preferable to form so that it has.

As described above, according to the return valve of the fuel supply device for a gas fuel vehicle according to the present invention, the distance between the packing member of the valve and the valve seat is increased so that the chatter ring can be suppressed to minimize noise generation. Expressed.

Claims (5)

delete A valve housing having a flow path connected to the connection pipe; A valve which is provided to be liftable in the flow path of the valve housing to open and close the opening of the flow path, and a bottom surface of which has a plunger protruding from the valve housing; A closing cap fixedly coupled to a lower portion of the valve housing spaced from the valve, and having a plurality of discharge holes radially perforated at one side thereof; An elastic means provided between the closing cap and the valve and formed of a compression spring for elastically supporting the valve; A fuel supply for a gas fuel vehicle, comprising: a closing nipple coupled to and fixed to a central portion of the closing cap spaced from the discharge port to support the elastic means, and the plunger of the valve being elevated during operation of the return valve is inserted into and guided through a through hole at the center thereof. In the return valve of the device, The upper part of the valve is made of a predetermined protrusion is inserted into the flow path, The return valve of the fuel supply device for a gas fuel vehicle, characterized in that a plurality of predetermined discharge grooves are formed on the side of the protrusion from the top to the bottom. The method of claim 2, Return valve of the fuel supply device for a gas fuel vehicle, characterized in that the discharge groove is formed to be inclined. The method of claim 2, Return valve of the fuel supply device for a gas fuel vehicle, characterized in that the discharge groove is formed vertically. The method according to claim 2 or 3, Return valve of the fuel supply device for a gas fuel vehicle, characterized in that the discharge groove is curved.

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