Device for controlling the closure of a fuel gun in a filler pipe of a fuel tank

Abstract

Disclosed is a device for controlling the closing of a fuel gun in a filler pipe of a fuel tank, which suppresses the premature closing of the fuel gun before the fuel tank is filled with fuel when fueling. The device includes a retainer installed in a filler pipe opening of the fuel tank, a partition plate arranged in a space between an inner peripheral surface of the filler pipe opening and an outer peripheral surface of the retainer and having a fuel inlet hole formed in a lower end of the partition plate, and a premature closing prevention valve arranged in the partition plate. The premature closing prevention valve closes the fuel inlet hole before the fuel tank is filled with fuel, and opens the fuel inlet hole by fuel flowing from the fuel tank to the filler pipe when the fuel tank is filled with fuel.

Description

Technical Field

[0001] This disclosure relates to a device for controlling the closing of a fuel nozzle in a fuel tank filling line. Background Technology

[0002] The statements in this section are provided only as background information in connection with this disclosure and may not constitute prior art.

[0003] Typically, fuel nozzles used to refuel a vehicle's fuel tank are configured to discharge fuel when the lever is pulled and then stop discharging fuel when the tank is full.

[0004] When the fuel nozzle discharges fuel, it uses the negative pressure created within the nozzle to sense the fullness of the fuel tank. The fuel nozzle releases the negative pressure by introducing air through the venturi port before the fuel tank is full, and creates a negative pressure by closing the venturi port when the fuel tank is full, thus sensing the fullness of the fuel tank.

[0005] When the fuel tank is full, the fuel returning through the fuel filler pipe closes the venturi port, thereby stopping the inflow of air through the venturi port. The negative pressure inside the fuel nozzle is no longer released, thus shutting off the fuel nozzle.

[0006] If the fuel tank is full under normal circumstances, the fuel nozzle continuously draws in air through the venturi port before it is closed. At this time, the fuel nozzle also draws in fuel vapors that are discharged to the refueling pipe through the balance pipe of the fuel tank. However, the amount of fuel vapors discharged to the refueling pipe is small, so the fuel nozzle is not closed until the fuel tank is full.

[0007] However, we have found that if the fuel tank is filled with fuel at high temperatures, the excess fuel vapors discharged through the fuel tank's balance pipe to the refueling pipe condense in the relatively cool venturi port, thus preventing air from flowing in. As a result, the negative pressure in the fuel nozzle is not released, causing the fuel nozzle to shut off prematurely before the fuel tank is filled with fuel.

[0008] The aforementioned premature shut-off of the fuel nozzle frequently occurs when the fuel tank is filled with fuel at high temperatures, and when the fuel tank temperature is too high, it may be difficult to fill the tank completely.

[0009] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure, and therefore may contain information that does not form prior art known to those skilled in the art. Summary of the Invention

[0010] This disclosure provides a device for controlling the closing of a fuel nozzle in a fuel filling line of a fuel tank, the device suppressing or preventing the fuel nozzle from closing before the fuel tank is filled with fuel.

[0011] In one aspect of this disclosure, a device for controlling the closure of a fuel nozzle in a fuel tank filling pipe includes: a retainer installed in the filling pipe opening of the fuel tank and having an external air inlet configured to draw in external air and an evaporation gas outlet configured to discharge fuel vapors, the external air inlet and the evaporation gas outlet being formed in an upper portion of the retainer based on the fuel injection direction of the filling pipe opening; and an opening formed in a lower portion of the retainer, configured to be in fluid communication with the external air inlet allowing fluid to flow therebetween, and disposed outside the fuel discharge portion of the fuel nozzle inserted into the filling pipe opening. The device includes: a venturi port for opening the fuel discharge section; a baffle disposed on the outer peripheral surface of the retainer to surround a first space configured to communicate with an opening and an external air inlet, such that fluid can flow between the first space and the external air inlet in the space between the inner peripheral surface of the filling port and the outer peripheral surface of the retainer, and the baffle having a fuel inlet formed in the lower end of the baffle; and an early shut-off prevention valve disposed in the baffle and configured to close the fuel inlet before the fuel tank is filled with fuel, and to open the fuel inlet when the fuel tank is filled with fuel due to fuel flowing from the fuel tank to the filling port.

[0012] In another configuration, a baffle can divide the space between the inner circumferential surface of the filler port and the outer circumferential surface of the retainer into a first space and a second space. The second space can be configured to communicate with an evaporative gas discharge port, allowing fluid to flow between the second space and the evaporative gas discharge port within the space between the inner circumferential surface of the filler port and the outer circumferential surface of the retainer. The baffle can be configured to seal the first space except for the fuel inlet port.

[0013] In another embodiment, a spring support plate may be mounted on the inner circumferential surface of the partition and configured such that a spring member for the premature shut-off prevention valve pressing against the fuel inlet port may be arranged between the spring support plate and the premature shut-off prevention valve.

[0014] In yet another form, the valve engagement protrusion configured to support the valve that prevents premature closure can be located at the lower end of the partition.

[0015] In another form, the spring member can cause the early-closing preventer valve to press against the valve engagement protrusion, so as to keep the early-closing preventer valve closed in the fuel inlet orifice before the spring member is compressed by the fuel flowing back from the fuel tank when the fuel tank is full.

[0016] In another form, when the fuel tank is full, the spring member can be compressed by the fuel flowing from the fuel tank into the filling port, thereby allowing the valve to close prematurely to prevent it from opening the fuel inlet orifice.

[0017] In another form, the retainer may have a fuel gun engagement protrusion located at the lower end of the retainer, and when the end of the fuel discharge portion of the fuel gun contacts the fuel gun engagement protrusion, the venturi port of the fuel discharge portion may face the opening of the retainer.

[0018] Further areas of applicability will become apparent from the description provided herein. It should be understood that the descriptions and specific examples are for illustrative purposes only and are not intended to limit the scope of this disclosure. Attached Figure Description

[0019] To facilitate a good understanding of this disclosure, various forms of this disclosure will now be described by way of example, with reference to the accompanying drawings, in which:

[0020] Figure 1 This is a view showing the configuration of a fuel system for a vehicle, in which a device for controlling the closure of the fuel nozzle in the fuel tank filling line, according to one form of the present disclosure, is applied;

[0021] Figure 2 It is along Figure 1 A cross-sectional view of the device taken by line AA;

[0022] Figure 3 It is along Figure 1 A cross-sectional view of the device intercepted by line A'-A';

[0023] Figure 4 It is along Figure 2 A cross-sectional view of line BB;

[0024] Figure 5 This is a view showing the operating status of the device when the fuel tank is being refueled at room temperature;

[0025] Figure 6 This is a view showing the operating state of the device when the fuel tank is being refueled under high-temperature conditions; and

[0026] Figure 7 This is a view showing the operating status of the device when the fuel tank is full.

[0027] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this disclosure in any way. Detailed Implementation

[0028] The following description is exemplary in nature only and is not intended to limit this disclosure, its application, or its uses. It should be understood that throughout the drawings, corresponding reference numerals indicate similar or corresponding parts and features.

[0029] Reference will be made in detail below to various forms of this disclosure, examples of which are illustrated in the accompanying drawings and described hereinafter. While this disclosure will be described in conjunction with exemplary forms, it will be understood that this description is not intended to limit this disclosure to the exemplary forms. Rather, this disclosure is intended to cover not only the exemplary forms, but also various alternatives, variations, equivalents, and other forms that may be within the spirit and scope of this disclosure. The details of the accompanying drawings are shown merely to explain the form of this disclosure and may differ from the actual implementation.

[0030] It should be understood that the accompanying drawings are not necessarily to scale and present slightly simplified representations of the various features illustrating the basic principles of this disclosure. Specific design features of this disclosure, such as particular dimensions, orientations, locations, and shapes, will be determined in part by the specific intended application and environment of use.

[0031] In the following description of the form, it should be understood that when a part is said to "comprise" an element, the part may also include other elements, and the presence of other elements is not excluded, unless otherwise stated.

[0032] Figure 1 This is a view showing a portion of the construction of a fuel system for a vehicle, in which a device for controlling the closure of the fuel nozzle in the fuel tank filling pipe, according to one form of the present disclosure, is applied.

[0033] like Figure 1 As shown, the fuel system for a vehicle includes: a fuel tank 10 configured to store fuel; a fuel pump 20 configured to pump fuel from the fuel tank 10 to the engine; a filler pipe 30 configured to inject fuel into the fuel tank 10; and a balance pipe 40 configured to release internal pressure in the fuel tank 10 while filling it.

[0034] The balance pipe 40 is connected to the fuel tank 10 and the refueling pipe 30, allowing fluid to flow between them, and thus serving to discharge the fuel vapors generated in the fuel tank 10 during refueling to the refueling pipe 30.

[0035] Here, the lower end of the balance pipe 40 passes through the upper end of the fuel tank 10 and is disposed inside the fuel tank 10. When the fuel in the fuel tank 10 reaches the full level, the lower end of the balance pipe 40 contacts the surface of the fuel and thus closes.

[0036] When the balance pipe 40 is closed while the fuel tank 10 is being filled, the internal pressure of the fuel tank 10 increases. As a result, the fuel in the fuel tank 10 flows back to the filling pipe 30, and the fuel flowing back to the filling pipe 30 causes the fuel nozzle to close, thereby stopping the discharge of fuel from the fuel nozzle.

[0037] The balance pipe 40 is connected to the upper part of the refueling pipe 30 so that fluid can flow between them, and the lower part of the refueling pipe 30 is connected to the fuel tank 10 so that fluid can flow between them.

[0038] like Figures 5 to 7 As shown, when refueling the fuel tank 10, the fuel discharge portion 1 of the fuel gun is inserted into the refueling port 31, which corresponds to the upper part of the refueling pipe 30. That is, the refueling port 31 is the part of the fuel discharge portion 1 of the fuel gun that is inserted and is connected to the balance pipe 40.

[0039] When fuel is injected into the fuel tank 10, the fuel vapor gas discharged through the balance pipe 40 can be discharged to the outside through the filling port 31.

[0040] Normally, when the fuel tank 10 is filled at room temperature, the fuel gun continuously draws in air through the venturi port 2 located in the fuel discharge section 1 before the fuel gun is closed. Here, the fuel gun can also draw in fuel vapor gas that is discharged to the filling port 31, but the amount of fuel vapor gas discharged to the filling port 31 is very small, so premature closure of the fuel gun will not occur.

[0041] like Figure 5 As shown, a venturi port 2 is formed in the fuel discharge section 1 of the fuel gun. The venturi port 2 is configured to generate an external force due to the internal pressure of the fuel gun when discharging fuel. A venturi port connecting pipe 3 is provided in the venturi port 2 and is arranged to extend into the interior of the fuel discharge section 1.

[0042] Before the fuel tank 10 is filled with fuel, the negative pressure formed in the fuel gun is released by drawing outside air into the fuel gun through the venturi port 2, thereby preventing the fuel gun from closing. When the fuel tank 10 is filled with fuel, the venturi port 2 is closed by fuel flowing back toward the filling port 31, and therefore, the negative pressure formed in the fuel tank 10 is not released through the venturi port 2, and the fuel tank 10 senses that it is full and stops discharging fuel.

[0043] However, when the fuel tank 10 is filled with fuel under the condition that excessive fuel vapor gas is generated in the fuel tank 10, the excess fuel vapor gas discharged to the filling port 31 through the balance pipe 40 flows into the interior of the Venturi port connecting pipe 3, which has a relatively low temperature, and then condenses in the Venturi port connecting pipe 3. As a result, the air intake through the Venturi port 2 stops, the negative pressure in the fuel gun is not released, and the fuel gun is closed in advance before the fuel tank 10 is filled with fuel.

[0044] Therefore, the present invention provides a device for controlling the closing of the fuel gun, the device being configured to prevent premature closing of the fuel gun in the filling port 31, such as... Figures 2 to 4 As shown.

[0045] The device is configured to smoothly release the negative pressure in the fuel gun not only when the fuel tank 10 is being filled at room temperature but also when the fuel tank 10 is being filled at high temperature, thereby fundamentally preventing the fuel gun from shutting off prematurely when the fuel tank 10 is being filled at high temperature.

[0046] When fuel tank 10 is filled under high-temperature conditions, a larger amount of fuel vapor gas can be generated in fuel tank 10 compared to when fuel tank 10 is filled at room temperature. For example, high temperature can be a temperature higher than room temperature by a specified value.

[0047] Figure 2 and Figure 3 An apparatus of one form according to this disclosure is shown. Here, Figure 2 It is along Figure 1 The cross-sectional view of the device taken by line AA. Figure 3 It is along Figure 1 The cross-sectional view of the device is taken by line A'-A'. Furthermore, Figure 4 It is along Figure 2 A cross-sectional view taken from the BB line.

[0048] like Figures 2 to 4 As shown, the device includes a retainer 50, a baffle 60, and an early shut-off prevention valve 70 disposed within the filling port 31 of the fuel tank 10.

[0049] The retainer 50 is configured to fixably support the fuel discharge portion 1 of the fuel gun inserted into the filling port 31, and is installed in the filling port 31 to be fixed.

[0050] More specifically, the retainer 50 can be formed in the shape of a tube having a tapered upper part and a lower part, the lower part having an inner diameter corresponding to the outer diameter of the fuel discharge portion 1.

[0051] Since the lower part of the retainer 50 has an inner diameter corresponding to the outer diameter of the fuel discharge portion 1, the retainer 50 can keep the fuel discharge portion 1 from moving when it is inserted into the filling port 31. Here, a small gap can be formed between the inner circumferential surface of the retainer 50 and the outer circumferential surface of the fuel discharge portion 1 to allow the fuel discharge portion 1 to smoothly enter and exit the filling port 31.

[0052] The upper part of the retainer 50 can be configured such that the upper end of the retainer 50 has a sufficiently large maximum outer diameter to be pressed into the upper part of the filling port 31. Therefore, when the retainer 50 is installed in the filling port 31, the upper end of the retainer 50 can be pressed against the inner circumferential surface of the filling port 31 in an airtight manner along the circumference of the filling port 31.

[0053] When the retainer 50 is installed in the filling port 31, the upper end of the retainer 50 can be positioned close to the upper end of the filling port 31 (i.e., the fuel injection hole 31a), and the lower end of the retainer 50 can be arranged below the upper end of the balance pipe 40 connected to the filling port 31.

[0054] Furthermore, a fuel gun engagement protrusion 54 may be provided at the lower part of the retainer 50, and the end of the fuel discharge portion 1 engages with the fuel gun engagement protrusion 54. The fuel gun engagement protrusion 54 may be formed on the inner circumference of the retainer 50 to protrude radially inward along the retainer 50. The fuel gun engagement protrusion 54 may be provided at the lower end of the retainer 50.

[0055] The fuel discharge portion 1 of the fuel gun can be inserted into the retainer 50 until the end of the fuel discharge portion 1 engages with the fuel gun engagement protrusion 54.

[0056] In addition, an external air inlet 51 and an evaporative gas outlet 52 are formed in the upper part of the retainer 50, and an opening 53 is formed in the lower part of the retainer 50 based on the fuel injection direction and the direction in which the fuel gun is inserted into the filling port 31.

[0057] An external air inlet 51 is formed in the retainer 50 to draw external air into the space between the inner peripheral surface of the filling port 31 and the outer peripheral surface of the retainer 50.

[0058] External air flowing into the retainer 50 through the fuel injection hole 31a of the filling port 31 can flow into the space between the filling port 31 and the retainer 50 through the external air inlet hole 51.

[0059] An evaporation gas discharge port 52 is formed in the retainer 50 to discharge fuel vapor gas that has been discharged through the balance pipe 40 into the space between the filling port 31 and the retainer 50 to the outside.

[0060] Fuel vapors discharged through the balance pipe 40 into the space between the filling port 31 and the retainer 50 can be discharged to the outside of the filling port 31 through the vapors discharge port 52 and the fuel injection port 31a.

[0061] Here, in order to prevent the mixing of external air and fuel vapor gas as much as possible, the external air inlet 51 and the vapor gas outlet 52 can be arranged in a position facing each other in the circumferential direction of the retainer 50.

[0062] Specifically, a plurality of external air inlets 51 and a plurality of evaporative gas outlets 52 may be provided in the upper part of the retainer 50. Here, the external air inlets 51 may be spaced apart from each other in the circumferential direction of the retainer 50, and the evaporative gas outlets 52 may also be spaced apart from each other in the circumferential direction of the retainer 50.

[0063] The opening 53 can be used to open the venturi port 2 of the fuel discharge portion 1 inserted into the filling port 31 and the retainer 50, and the opening is formed by opening one side of the lower part of the retainer 50 in the circumferential direction.

[0064] Therefore, when the fuel discharge portion 1 is inserted into the retainer 50, the venturi port 2 can be positioned facing the opening 53 of the retainer 50. More specifically, the opening 53 is positioned outside the fuel discharge portion 1 inserted into the lower part of the retainer 50, thus enabling the venturi port 2 of the fuel discharge portion 1 to be opened.

[0065] For example, when the fuel discharge portion 1 is inserted into the retainer 50 until the fuel discharge portion 1 reaches the fuel gun engagement protrusion 54 of the retainer 50, the venturi port 2 can be positioned facing the opening 53.

[0066] The opening 53 can be arranged below and communicate with the external air inlet 51, allowing fluid to flow therethrough. For example, the external air inlet 51 and the opening 53 can be arranged in a row along the direction in which the fuel discharge portion 1 is inserted into the retainer 50.

[0067] Air introduced into the space between the retainer 50 and the filling port 31 through the external air inlet 51 can be drawn into the fuel gun through the venturi port 2 of the fuel discharge section 1 opened by the opening 53.

[0068] In addition, to prevent fuel vapor gas introduced into the filling port 31 from being sucked into the venturi port connecting pipe 3 through the venturi port, a baffle 60 is provided on the outer peripheral surface of the retainer 50.

[0069] The partition 60 divides the space between the inner peripheral surface of the filling port 31 and the outer peripheral surface of the retainer 50 into a first space S1 and a second space S2, and the partition can be arranged on the outer peripheral surface of the retainer 50 to surround the space around the external air inlet hole 51 and the opening 53.

[0070] That is, the baffle 60 can be configured to surround the first space S1 connecting the external air inlet hole 51 and the opening 53, so that fluid can flow between the filling port 31 and the retainer 50.

[0071] The first space S1 is a space communicating with the external air inlet 51 and the opening 53 to allow fluid to flow between them, and the second space S2 is a space communicating with the evaporated gas outlet 52 to allow fluid to flow between them. The first space S1 and the second space S2 can be independent spaces separated from each other by a partition 60 and an early-closing prevention valve 70.

[0072] like Figures 2 to 4 As shown, in order to suppress or prevent fuel vapor gas from contacting the venturi port 2, a baffle 60 can be provided to seal the first space S1. For example, the edge of the baffle 60 can be fixed to the outer peripheral surface of the retainer 50 to airtightly seal the first space S1.

[0073] In one configuration, the baffle 60 is configured to seal a first space S1 except for the fuel inlet 61 located at the lower end of the baffle.

[0074] The partition 60 has a fuel inlet 61 to seal the first space S1 before the fuel tank 10 is filled, and to open the first space S1 when the fuel tank 10 is filled.

[0075] The fuel inlet 61 is formed in such a way that the lower end of the partition 60 is opened so that fuel is drawn into the first space S1 through the fuel inlet 61.

[0076] When fuel in the fuel tank 10, which is returning to the filling port 31, flows into the first space S1 through the fuel inlet port 61, the fuel comes into contact with the venturi port 2 of the fuel gun, thereby closing the venturi port 2.

[0077] In another embodiment, the partition 60 may include: a first sidewall 63 and a second sidewall 64 extending radially from the outer peripheral surface of the retainer 50; and an outer wall 65 integrally connecting the first sidewall 63 and the second sidewall 64. When the retainer 50 is installed in the filling port 31, the outer wall 65 may press against the inner peripheral surface of the filling port 31.

[0078] The first sidewall 63 and the second sidewall 64 can be arranged to be spaced apart from each other by a specified distance in the circumferential direction of the retainer 50. In addition, the outer wall 65 can be arranged at the ends of the first sidewall 63 and the second sidewall 64 in the radial direction of the retainer 50.

[0079] To open and close the fuel inlet port 61, an early shut-off prevention valve 70 can be provided in the baffle 60.

[0080] The pre-closing prevention valve 70 is used to close the fuel inlet port 61 before the fuel tank 10 is filled, and to open the fuel inlet port 61 when the fuel tank 10 is filled.

[0081] An early shutdown prevention valve 70 is installed in the partition 60 and is disposed in the first space S1 in a state in which the early shutdown prevention valve 70 is in contact with both the inner peripheral surface of the partition 60 and the outer peripheral surface of the retainer 50.

[0082] The early closure prevention valve 70 can use the spring member 80 to maintain the fuel inlet port 61 in an airtight seal.

[0083] The spring member 80 is used to press the pre-closing prevention valve 70 toward the fuel inlet port 61, and due to the elastic restoring force generated when the spring member 80 is compressed, the spring member 80 can press the pre-closing prevention valve 70 toward the fuel inlet port 61.

[0084] For this purpose, the spring member 80 mounted on the spring support plate 66 can be disposed on the premature closing prevention valve 70. That is, the spring member 80 mounted on the spring support plate 66 can be disposed between the spring support plate 66 and the premature closing prevention valve. More specifically, the upper end of the spring member 80 can be mounted on the spring support plate 66, and the lower end of the spring member 80 can be mounted on the premature closing prevention valve 70.

[0085] The spring support plate 66 can be mounted on the inner peripheral surface of the outer wall 65 of the partition 60, or on the outer peripheral surface of the retainer 50. Here, the spring support plate 66 can be formed by a plate member having a cross-sectional area smaller than that of the first space S1, or by a plate member having an opening formed in the center, based on the arrangement of the spring support plate 66, so that fluid can flow between the external air inlet 51 and the opening 53 in the first space S1.

[0086] Furthermore, a valve engagement protrusion 62 configured to support the premature closure prevention valve 70 can be provided at the lower end of the partition 60. The valve engagement protrusion 62 can be provided outside the fuel inlet port 61 and supports the lower end of the premature closure prevention valve 70 pressed by the spring member 80, thereby preventing the premature closure prevention valve 70 from separating from the first space S1.

[0087] The spring member 80 will keep the premature closing prevent valve 70 closed at the fuel inlet 61 of the diaphragm 60 before the fuel tank 10 is full. That is, before the spring member 80 is compressed by the pressure of the fuel flowing back from the fuel tank 10, the spring member 80 will press the premature closing prevent valve 70 against the valve engagement protrusion 62, so that the premature closing prevent valve 70 keeps the fuel inlet 61 closed.

[0088] like Figure 5 and Figure 6 As shown, before the fuel tank 10 is filled, the preventive valve 70 is closed in advance to keep the fuel inlet hole 61 of the baffle 60 closed by the spring member 80, and when the fuel tank 10 is filled, the fuel inlet hole 61 is opened due to the backflow of fuel from the fuel tank 10 to the filling pipe 31, as shown. Figure 7 As shown.

[0089] That is, when the fuel tank 10 is full, when the premature shut-off prevention valve 70 is pressed upward by the fuel flowing back from the fuel tank 10 to the filling port 31, the spring member 80 is compressed, and thus the premature shut-off prevention valve 70 is allowed to open the fuel inlet port 61.

[0090] Figures 5 to 7 The various operating states of the apparatus with the above configuration and the fluid flow in the apparatus are shown. Figure 5 This is a view showing the operating status of the device when the fuel tank is being refueled at room temperature. Figure 6 This is a view showing the operating status of the device when the fuel tank is being refueled under high-temperature conditions. Figure 7 This is a view showing the operating status of the device when the fuel tank is full.

[0091] When the external temperature of fuel tank 10 is room temperature, such as Figure 5 As shown, the pre-closing preventer valve 70 closes the fuel inlet port 61 of the baffle 60, and the fluid in the filling port 31 cannot flow into the first space S1. The fluid can be fuel vapor gas.

[0092] When the fuel discharge portion 1 of the fuel gun is inserted into the retainer 50, the venturi port 2 of the fuel discharge portion 1 is exposed to the first space S1 through the opening 53 of the retainer 50.

[0093] When the fuel discharge section 1 discharges fuel into the filling port 31, a negative pressure is generated inside the fuel gun, and thus the fuel gun draws in air through the venturi port 2. As the air in the first space S1 is drawn into the fuel gun, the external air outside the filling port 31 is drawn into the first space S1 through the external air inlet 51.

[0094] When fuel is injected into the fuel tank 10, the fuel vapor generated in the fuel tank 10 is discharged through the balance pipe 40 to the filling port 31, passes through the second space S2 of the filling port 31 and the vapor discharge hole 52 of the retainer 50, and is discharged to the outside of the filling port 31.

[0095] Here, the first space S1 and the second space S2 are separated by a partition 60 and an early shut-off prevention valve 70, and therefore the venturi port 2 does not draw in fuel vapor gas.

[0096] On the other hand, when the external temperature of the fuel tank 10 is high, such as Figure 6 As shown, the pre-closing prevention valve 70 keeps the fuel inlet hole 61 of the baffle 60 closed, and the first space S1 keeps the fluid in the filling port 31 from flowing into the first space S1.

[0097] When the fuel discharge portion 1 of the fuel gun is inserted into the retainer 50, the venturi port 2 is exposed to the first space S1 through the opening 53 of the retainer 50.

[0098] When the fuel discharge section 1 discharges fuel into the filling port 31, a negative pressure is generated inside the fuel gun, and as a result, the fuel gun draws in air from the first space S1 through the venturi port 2. As the air in the first space S1 is drawn into the fuel gun, external air outside the filling port 31 is drawn into the first space S1 through the external air inlet 51.

[0099] When fuel is injected into the fuel tank 10, the fuel vapor generated in the fuel tank 10 is discharged to the filling port 31 through the balance pipe 40, and is discharged to the outside of the filling port 31 through the second space S2 and the vapor exhaust port 52.

[0100] When the external temperature is high, the amount of fuel vapor gas generated in the fuel tank 10 can be much greater than when the external temperature is room temperature, and the excess fuel vapor gas is discharged to the filling port 31 through the balance pipe 40. However, the first space S1 and the second space S2 are separated by the partition 60 and the early shut-off prevention valve 70, and therefore the venturi port 2 of the fuel gun does not come into contact with the fuel vapor gas.

[0101] Therefore, refueling can proceed normally until the fuel tank 10 is full, without causing the fuel nozzle to shut off prematurely.

[0102] When fuel tank 10 is full, as Figure 7As shown, fuel in fuel tank 10 flows back to filler port 31. The fuel flowing back to filler port 31 presses upward through fuel inlet hole 61 of baffle 60 to prevent premature closure of valve 70. Here, premature closure of valve 70 is pushed upward by fuel and compresses spring member 80, thereby opening fuel inlet hole 61.

[0103] Fuel flowing into the first space S1 through the fuel inlet 61 contacts the venturi port 2 and closes the venturi port 2, thereby shutting off the fuel gun without releasing the negative pressure generated in the fuel gun, thus stopping the discharge of fuel.

[0104] Here, the early closing prevention valve 70 can prevent fuel flowing back into the filling port 31 from flowing to the outside of the filling port 31 through the external air inlet 51. For this purpose, the early closing prevention valve 79 can be formed by a plate-type member or a block-type member having a cross-sectional area corresponding to the cross-sectional area of ​​the first space S1.

[0105] Thus, the device according to this disclosure facilitates the normal operation of the fuel nozzle until the fuel tank 10 is full of fuel, regardless of the external temperature conditions of the fuel tank 10. Therefore, the device according to this disclosure can suppress or prevent premature shut-off of the fuel nozzle before the fuel tank 10 is full during refueling.

[0106] As can be clearly seen from the above description, a device for controlling the closure of the fuel nozzle in the fuel tank's filling pipe facilitates the normal operation of the fuel nozzle until the fuel tank is full, regardless of the external temperature conditions of the fuel tank. Therefore, the device according to this disclosure can prevent premature closure of the fuel nozzle before the fuel tank is full during refueling.

[0107] This disclosure has been described in detail with reference to its form. However, those skilled in the art will understand that changes may be made to these forms without departing from the principles and spirit of this disclosure.

Claims

1. A device for controlling the closing of a fuel nozzle in a fuel tank filling pipe, the device comprising: A retainer, installed in the filler neck of the fuel tank, and the retainer includes: The external air inlet is configured to draw in external air. An evaporation gas discharge port is configured to discharge fuel evaporation gas, wherein the external air inlet port and the evaporation gas discharge port are formed in the upper part of the retainer along the fuel injection direction of the filling pipe port, and An opening is formed in the lower part of the retainer, arranged outside the fuel discharge portion of the fuel gun inserted into the filling port, and configured to be in fluid communication with the external air inlet and to open the venturi port of the fuel discharge portion; A baffle plate is disposed in the space between the inner circumferential surface of the filling port and the outer circumferential surface of the retainer, and has a fuel inlet formed in the lower end of the baffle plate, wherein the baffle plate is configured to define a first space in which the opening and the external air inlet are in fluid communication with each other; and An early closure prevention valve is arranged in the partition and configured to: Close the fuel inlet port before the fuel tank is filled with fuel, and When the fuel tank is filled with fuel, the fuel inlet is opened by the fuel flowing from the fuel tank to the filling port.

2. The apparatus according to claim 1, wherein, The baffle divides the space between the inner circumferential surface of the filling port and the outer circumferential surface of the retainer into a first space and a second space, and the second space is configured to communicate with the evaporating gas discharge port, such that fluid flows between the second space and the evaporating gas discharge port.

3. The apparatus according to claim 1, wherein, The baffle is configured to seal the first space except for the fuel inlet port.

4. The apparatus according to claim 1, further comprising: A spring support plate is mounted on the inner circumferential surface of the partition plate; as well as A spring member is configured to press the premature shut-off prevention valve against the fuel inlet orifice and is disposed between the spring support plate and the premature shut-off prevention valve.

5. The apparatus according to claim 4, wherein, A valve engagement protrusion configured to support the premature closure prevention valve is located at the lower end of the partition.

6. The apparatus according to claim 5, wherein, The spring member is configured to press the premature shut-off preventer valve against the valve engagement protrusion to keep the premature shut-off preventer valve closed at the fuel inlet before the fuel flowing back from the fuel tank when the spring member is filled with fuel.

7. The apparatus according to claim 4, wherein, When the fuel tank is filled with fuel, the spring member is compressed by the fuel flowing from the fuel tank into the filling port, and thus allows the early shut-off prevention valve to open the fuel inlet.

8. The apparatus according to claim 1, wherein, The external air inlet and the evaporating gas outlet are arranged to face each other in the circumferential direction of the retainer.

9. The apparatus according to claim 1, wherein, The retainer is installed in the filling port, such that the upper end of the retainer is airtightly pressed against the inner circumferential surface of the filling port.

10. The apparatus according to claim 1, wherein, The retainer has a fuel gun engagement protrusion located at the lower end of the retainer, and when the end of the fuel discharge portion of the fuel gun contacts the fuel gun engagement protrusion, the venturi port of the fuel discharge portion faces the opening of the retainer.

11. The apparatus according to claim 1, wherein: The fuel tank has a balance pipe configured to discharge the fuel vapors from the fuel tank to the filling port during refueling. The end of the balance tube is disposed in the fuel tank, and when the fuel tank is filled with fuel, the end of the balance tube contacts the surface of the fuel to be closed.

12. The apparatus according to claim 1, wherein, The fuel discharge section of the fuel gun is configured to draw in air through the venturi port when the fuel gun discharges fuel.

13. The apparatus according to claim 12, wherein, The fuel discharge portion of the fuel gun is configured to stop the discharge of fuel when the venturi port is closed by fuel flowing from the fuel tank into the filling port.

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