Integrated icv valve and metal tank having same

Abstract

The utility model relates to one -way valve technical field discloses a kind of integrated ICV valve and metal oil tank with it, integrated ICV structure includes: oil filling neck pipe;Valve barrel, injection molding in one end of oil filling neck pipe, the end edge of oil filling neck pipe close to valve barrel is provided with the flanging along its radial outward, knurl structure is arranged on flanging;Cover, with valve barrel articulates, cover is suitable for by its turnover to open or close the passage of valve barrel, cover and valve barrel between being provided with torsion spring, and torsion spring is used to make cover have the movement tendency of closing valve barrel passage.The utility model provides integrated ICV structure, by the valve barrel integrated injection molding on oil filling neck pipe, to guarantee completely fill the gap between valve barrel and oil filling neck pipe at connecting place, to enhance connection reliability and sealing effect, to reduce the number of parts and assembly process, seal ring is dispensed with;And by setting flanging, to facilitate further to improve connection strength and axial tensile strength.

Description

Technical Field

[0001] This utility model relates to the field of one-way valve technology, specifically to an integrated ICV valve and a metal oil tank having the same. Background Technology

[0002] The fuel tank ICV valve (fuel tank anti-backflow check valve) is a one-way valve used to prevent fuel backflow during refueling and to prevent fuel leakage when the vehicle tilts or rolls over. Traditional ICV structures typically use a split connection, where the metal refueling neck and plastic valve cylinder are manufactured separately and then assembled using snap-fit ​​or threaded connections. However, due to the creep of plastic under long-term stress, this split structure suffers from insufficient connection strength and sealing reliability, increasing leakage channels. Specifically, there is a risk of connection failure and fuel leakage at the joint between the refueling neck and valve cylinder. Furthermore, the split design involves more processes, impacting production efficiency. Utility Model Content

[0003] In view of this, the present invention provides an integrated ICV valve and a metal oil tank thereon to solve the problem of oil leakage due to connection failure at the connection between the refueling neck and the valve cylinder, and the problem that the split design involves more processes and affects production efficiency.

[0004] In a first aspect, this utility model provides an integrated ICV valve, comprising:

[0005] Add fuel to the neck;

[0006] The valve cylinder is injection molded at one end of the filler neck so that the valve cylinder and the filler neck are connected as an integral structure. The end edge of the filler neck near the valve cylinder is provided with a flange that runs radially outward, and the flange is provided with a knurled structure.

[0007] A gland, hinged to the valve cylinder, is adapted to open or close the passage of the valve cylinder by flipping it over. A torsion spring is provided between the gland and the valve cylinder to give the gland a tendency to close the passage of the valve cylinder.

[0008] In one alternative embodiment, the valve cylinder includes a convex wall disposed at one end away from the refueling neck, a support is disposed on the gland, a rotating shaft is connected to the support, the rotating shaft is connected to the convex wall, and the gland is hinged to the valve cylinder through the support and the rotating shaft; a torsion spring is sleeved on the rotating shaft, one end of the torsion spring is pressed against the gland, and the other end is pressed against the convex wall.

[0009] In one alternative embodiment, the convex wall is provided with a relief groove for accommodating the support, and the rotating shaft is disposed within the relief groove.

[0010] In one optional embodiment, a flow guiding structure is provided on the side of the cap facing the inside of the refueling neck. The flow guiding structure includes a plurality of parallel and spaced protrusions, the length direction of which is perpendicular to the axis of rotation.

[0011] In one alternative embodiment, the flow guiding structure further includes a stop wall, which is fixedly connected to one end of a plurality of protrusions away from the torsion spring.

[0012] In one alternative embodiment, the side of the stop wall near the protruding ridge is configured as a first inclined surface.

[0013] Secondly, this utility model also provides a method for manufacturing the above-mentioned integrated ICV valve, comprising the following steps:

[0014] To produce a metal refueling neck;

[0015] Open the injection mold and install the oil neck pipe onto the injection mold;

[0016] The injection mold is closed to clamp the oil neck and form a cavity for valve tube molding;

[0017] Connect the nozzle of the injection molding machine to the feed port of the injection mold to inject molten material into the cavity.

[0018] Pressure holding and cooling are used to solidify and shape the raw material.

[0019] The injection mold is opened, and the oil neck pipe and the valve tube injection molded at its end are removed.

[0020] A gland is hinged to the end of the valve tube away from the refueling neck. The gland is adapted to open or close the passage of the valve tube by flipping it. A torsion spring is provided between the gland and the valve tube to give the gland a tendency to close the passage of the valve tube.

[0021] In one optional embodiment, the injection process includes a first injection stage and a second injection stage. The injection pressure in the first injection stage is 60 bar to 80 bar, and the injection speed is 8 mm / s to 12 mm / s. The injection pressure in the second injection stage is 60 bar to 80 bar, and the injection speed is 18 mm / s to 22 mm / s.

[0022] The pressure holding process adopts an additive pressure holding method, including a first pressure holding stage and a second pressure holding stage. The injection pressure in the first pressure holding stage is 70 bar-90 bar, which is held for 1 second-3 seconds before transitioning to the second pressure holding stage. The injection pressure in the second pressure holding stage is 75 bar-95 bar, and the holding time in the second pressure holding stage is 2 seconds-4 seconds. The injection pressure in the second pressure holding stage must be greater than that in the first pressure holding stage. The transition time from the first pressure holding stage to the second pressure holding stage is 3 seconds-5 seconds.

[0023] In one optional embodiment, mold closing is divided into multiple stages, including a first mold closing stage, a second mold closing stage, a third mold closing stage, a low-pressure mold closing stage, and a high-pressure mold closing stage; the mold closing pressure in the first mold closing stage is 60 bar-80 bar, and the mold closing speed is 47 mm / s-53 mm / s; the mold closing pressure in the second mold closing stage is 50 bar-70 bar, and the mold closing speed is 37 mm / s-43 mm / s; the mold closing pressure in the third mold closing stage is 20 bar-40 bar, and the mold closing speed is 32 mm / s-38 mm / s; the mold closing pressure in the low-pressure mold closing stage is 1 bar-13 bar, and the mold closing speed is 1 mm / s-6 mm / s; and the mold closing pressure in the high-pressure mold closing stage is 125 bar-145 bar, and the mold closing speed is 32 mm / s-38 mm / s.

[0024] The mold-making process is divided into several stages, including the first, second, third, fourth, and fifth mold-making stages. The mold-making pressure in the first stage is 90-110 bar, and the mold-making speed is 28-32 mm / s. The mold-making pressure in the second stage is 60-80 bar, and the mold-making speed is 23-27 mm / s. The mold-making pressure in the third stage is 35-55 bar, and the mold-making speed is 43-47 mm / s. The mold-making pressure in the fourth stage is 20-40 bar, and the mold-making speed is 33-37 mm / s. The mold-making pressure in the fifth stage is 5-25 bar, and the mold-making speed is 8-12 mm / s.

[0025] Thirdly, this utility model also provides a metal oil tank, including the aforementioned integrated ICV valve.

[0026] The technical solution of this utility model has the following advantages:

[0027] 1. The integrated ICV valve provided by this utility model is made by integrally injection molding the valve cylinder onto the filling neck pipe, so as to ensure complete filling of the gap between the valve cylinder and the filling neck pipe at the connection, thereby enhancing the connection reliability and sealing effect, eliminating the need for a sealing ring, reducing the number of parts and assembly steps; and by setting a flange, it is possible to further improve the connection strength and axial pull-out resistance.

[0028] 2. The integrated ICV valve provided by this utility model uses a convex wall to gather and concentrate the gasoline at the valve cylinder outlet, making it as columnar as possible, thereby reducing evaporation.

[0029] 3. The integrated ICV valve provided by this utility model has a guide groove formed between two adjacent protrusions. The length direction of the guide groove is perpendicular to the axis of the rotating shaft. The guide groove is used to guide the fuel that impacts the cap, thereby improving the flow stability during the fuel filling process.

[0030] 4. The integrated ICV valve provided by this utility model has the greatest resistance at the stop wall during fuel filling, which helps to make the opening angle of the gland larger, thereby making the size of the valve cylinder passage opened by the gland larger, which helps to make fuel filling smoother.

[0031] 5. The integrated ICV valve provided by this utility model, by setting a first inclined surface, makes the flow of fuel in the guide groove near the stop wall area smoother.

[0032] 6. The manufacturing method of the integrated ICV valve provided by this utility model enables the valve cylinder and the filling neck to be integrally molded into a single structure through injection molding, thereby improving the connection strength and sealing effect between the valve cylinder and the filling neck.

[0033] 7. The manufacturing method of the integrated ICV valve provided by this utility model uses a lower speed in the first injection stage to ensure that the melt fills the cavity smoothly, effectively expelling gas from the cavity and avoiding defects such as trapped gas and scorching caused by excessive injection speed. A higher speed is used in the second injection stage to quickly complete the filling of the remaining portion, preventing premature cooling of the previously injected melt and the formation of cold slug marks, thus ensuring the integrity of the valve cylinder's appearance and the uniformity of its internal texture. Through two pressure-increasing holding stages, it is beneficial to better replenish the melt to the depths of the cavity, compensating for volume shrinkage during the solidification process of the plastic's cold zone, thereby making the injection-molded product more compact and preventing problems such as shrinkage, porosity, and cracks. If the holding time is too short, the melt has not yet formed an effective skin, resulting in poor shrinkage compensation; if the holding time is too long, the gate may have solidified, losing its shrinkage compensation ability. Switching within this holding time range helps to ensure a smooth transition from the first stage, which is mainly focused on compaction, to the second stage, which is mainly focused on compensating for shrinkage, while the melt still possesses good fluidity.

[0034] 8. The manufacturing method of the integrated ICV valve provided by this utility model, by setting different mold closing speeds and pressures for different mold closing stages, helps to ensure the stability of the clamping process of the refueling neck pipe. By setting an extremely low speed and extremely low pressure mold closing stage before high pressure mold closing, a buffer protection stage is formed before the final high pressure mold locking. By setting multiple mold opening stages, the mold opening pressure and speed can be changed step by step, which helps to achieve smooth and damage-free mold opening.

[0035] 9. The metal oil tank provided by this utility model has the same effect as an integrated ICV valve because it includes an integrated ICV valve, and its beneficial effects will not be repeated here. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a front view of an integrated ICV valve according to an embodiment of the present utility model;

[0038] Figure 2 for Figure 2 The diagram shown is a structural schematic of the refueling neck.

[0039] Figure 3 for Figure 1 The diagram shows the structure of an integrated ICV valve.

[0040] Figure 4 for Figure 3 The diagram shows the structure of the gland and the flow guide.

[0041] Figure 5 for Figure 1 The diagram shows the structure of the integrated ICV valve in the open state.

[0042] Figure 6 This is an exploded view of a portion of the structure of an injection mold according to an embodiment of the present invention. Figure 1 ;

[0043] Figure 7 for Figure 6 The diagram shows an exploded view of part of the injection mold structure. Figure 2 ;

[0044] Figure 8 for Figure 6 The diagram shows the structure of the rear mold;

[0045] Figure 9 for Figure 8 A magnified view of part A in the diagram;

[0046] Figure 10 for Figure 8 The diagram shown illustrates the structure of the rear mold that conceals a slider and a core.

[0047] Figure 11 for Figure 10The front view showing the rear mold mating with the oil neck tube;

[0048] Figure 12 for Figure 11 A magnified view of part B in the diagram;

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Oil neck tube; 101. Flanged edge; 2. Rear mold; 21. Mounting hole; 211. Sub-mounting hole; 22. Slider; 23. Base; 3. Front mold; 31. Moving seat; 311. Relief hole; 32. Cover plate; 41. Core; 42. Positioning rod; 5. Guide post; 6. Cavity; 7. Injection channel; 8. Valve cylinder; 81. Raised wall; 811. Notch; 9. Pressure cap; 10. Groove; 11. Protrusion; 12. Torsion spring; 13. Annular plate; 131. Annular protrusion; 14. Positioning groove; 15. Relief groove; 16. Support; 17. Rotating shaft; 18. Base plate; 19. Raised ridge; 191. Second inclined surface; 20. Stop wall; 201. First inclined surface; 24. First strip groove; 25. Second strip groove. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0052] The following is combined with Figures 1 to 12 The following describes embodiments of the present invention.

[0053] According to an embodiment of the present invention, an integrated ICV valve is provided, comprising:

[0054] Refueling neck tube 1;

[0055] The valve cylinder 8 is injection molded at one end of the filling neck tube 1 so that the valve cylinder 8 and the filling neck tube 1 are connected as an integral structure. The end edge of the filling neck tube 1 near the valve cylinder 8 is provided with a flange 101 that extends radially outward, and the flange 101 is provided with a knurled structure.

[0056] A pressure cap 9 is hinged to a valve cylinder 8. The pressure cap 9 is adapted to open or close the passage of the valve cylinder 8 by flipping it. A torsion spring 12 is provided between the pressure cap 9 and the valve cylinder 8. The torsion spring 12 is used to give the pressure cap 9 a tendency to close the passage of the valve cylinder 8.

[0057] The integrated ICV valve provided in this embodiment is formed by integrally injection molding the valve cylinder 8 onto the filling neck pipe 1, so as to ensure that the gap between the valve cylinder 8 and the filling neck pipe 1 is completely filled, thereby enhancing the connection reliability and sealing effect, eliminating the need for a sealing ring, reducing the number of parts and assembly steps; and by setting a flange 101, the connection strength and axial pull-out resistance are further improved.

[0058] Specifically, the flange 101 is provided to improve the tensile strength of the valve cylinder 8 and the oil filling neck 1 in the axial direction. Furthermore, the assembly of a split-type ICV valve inevitably results in a certain rate of assembly damage, while the assembly damage rate approaches zero when using an injection-molded one-piece design.

[0059] In one embodiment, combined Figure 1 and Figure 3 As shown, the valve cylinder 8 includes a convex wall 81 located at one end away from the refueling neck pipe 1. A support 16 is provided on the pressure cap 9, and a rotating shaft 17 is connected to the support 16. The rotating shaft 17 is connected to the convex wall 81, and the pressure cap 9 is hinged to the valve cylinder through the support 16 and the rotating shaft 17. A torsion spring 12 is sleeved on the rotating shaft 17, with one end of the torsion spring 12 pressed against the pressure cap 9 and the other end pressed against the convex wall 81.

[0060] The integrated ICV valve provided in this embodiment uses a convex wall 81 to gather and concentrate the gasoline at the outlet of the valve cylinder 8, making it as columnar as possible, thereby reducing evaporation.

[0061] Specifically, the convex wall 81 extends along the axial direction of the valve cylinder 8. Since gasoline is added to the vehicle's fuel tank, which has high volatility, the convex wall 81 ensures that the gasoline exiting the valve cylinder 8 is sprayed in a columnar shape during the filling process, preventing it from spreading outwards. This reduces the liquid dispersion area, lowers the amount of fuel vapor evaporation, and decreases the pressure inside the fuel tank. In actual use, the integrated ICV valve is horizontally mounted on the fuel tank housing. Therefore, as... Figure 1 and Figure 5 As shown, a notch 811 is provided in the lower region of the convex wall 81 to allow gasoline to be sprayed obliquely downwards. An annular plate 13 is fixedly provided on the outer peripheral wall of the refueling neck 1, and the annular plate 13 surrounds the axis of the refueling neck 1. The annular plate 13 is used to fixally connect to the fuel tank housing. The side of the annular plate 13 away from the valve cylinder 8 is provided with an alignment mark corresponding to the notch 811, so as to indicate the orientation of the notch 811 when installing the integrated IVC structure.

[0062] Combination Figure 3As shown, the pressure cap 9 has a first strip groove 24, and the inner wall of the stop wall 20 has a second strip groove 25. One end of the torsion spring 12 is located in the first strip groove 24, and the other end is located in the second strip groove 25. The first strip groove 24 and the second strip groove 25 limit the two ends of the torsion spring 12 to ensure the rotational stability of the torsion spring 12 during the flipping process of the pressure cap 9.

[0063] In one embodiment, combined Figure 3 As shown, the convex wall 81 is provided with a relief groove 15 for accommodating the support 16, and the rotating shaft 17 is disposed in the relief groove 15.

[0064] Specifically, under extreme conditions, when the gland 9 is pushed open to its maximum angle by fuel, the support 16 can be accommodated within the relief groove 15, preventing the support 16 from colliding with the protruding wall 81 and affecting the opening angle of the gland 9. The first strip groove 24 is formed within the relief groove 15.

[0065] In one embodiment, combined Figure 4 and Figure 5 As shown, a flow guiding structure is provided on the side of the cap 9 facing the inside of the refueling neck pipe 1. The flow guiding structure includes a plurality of parallel and spaced protrusions 19, and the length direction of the protrusions 19 is perpendicular to the axis direction of the rotating shaft 17.

[0066] The integrated ICV valve provided in this embodiment has a flow guide groove formed between two adjacent protrusions 19. The length direction of the flow guide groove is perpendicular to the axis direction of the rotating shaft 17. The flow guide groove is used to guide the fuel that impacts the cap 9, thereby improving the flow stability during the fuel filling process.

[0067] Specifically, the flow guiding structure also includes a base plate 18, one side of which is fixedly connected to the pressure cap 9 and the other side is fixedly connected to the protrusion 19. The base plate 18 is used to connect the pressure cap 9 and the protrusion 19.

[0068] Furthermore, the end wall of the protruding ridge 19 near the torsion spring 12 is constructed as a second inclined surface 191. The second inclined surface 191 is inclined in the direction away from the cap 9 toward the side away from the torsion spring 12, so as to reduce the impact force of fuel on the protruding ridge 19 and prevent fuel from vertically impacting the protruding ridge 19 after the cap 9 is opened 90°.

[0069] In one embodiment, combined Figure 4 and Figure 5 As shown, the flow guiding structure also includes a stop wall 20, which is fixedly connected to one end of a plurality of protrusions 19 away from the torsion spring 12.

[0070] The integrated ICV valve provided in this embodiment has the greatest resistance at the stop wall 20 during fuel filling, which helps to make the opening angle of the cap 9 larger, thereby making the size of the valve cylinder 8 passage opened by the cap 9 larger, which helps to make fuel filling smoother.

[0071] Specifically, the stop wall 20 is located at the end of the protrusion 19 away from the torsion spring 12. During refueling, the liquid enters the fuel tank through the ICV structure, and the cap 9 is pushed open by the high-velocity fuel. The stop wall 20 is set to increase the resistance of the liquid at that point, so that the opening angle of the cap 9 can be larger, which makes refueling smoother.

[0072] In one embodiment, combined Figure 4 As shown, the side of the stop wall 20 near the protruding ridge 19 is constructed as a first inclined surface 201.

[0073] The integrated ICV valve provided in this embodiment, by setting a first inclined surface 201, makes the flow of fuel in the guide groove near the stop wall 20 area smoother.

[0074] Specifically, the first inclined surface 201 is inclined in the direction away from the pressure cap 9 toward the side away from the torsion spring 12, so as to make the flow of fuel in the area near the stop wall 20 in the guide groove smoother and reduce the generation of eddies.

[0075] According to an embodiment of the present invention, another aspect provides a method for manufacturing the aforementioned integrated ICV valve, comprising the following steps:

[0076] Make a metal refueling neck 1;

[0077] Open the injection mold and install the oil neck pipe 1 onto the injection mold;

[0078] The injection mold is closed to clamp the oil neck tube 1 and form a cavity 6 for forming the valve cylinder 8;

[0079] Connect the nozzle of the injection molding machine to the feed port of the injection mold and inject the molten material into the cavity 6.

[0080] Pressure holding and cooling are used to solidify and shape the raw material.

[0081] The injection mold is opened, and the oil neck pipe 1 and the valve cylinder 8, which is injection molded at its end, are taken out.

[0082] A pressure cap 9 is hinged to the end of the valve cylinder 8 away from the oil neck pipe 1. The pressure cap 9 is adapted to open or close the passage of the valve cylinder 8 by flipping it. A torsion spring 12 is provided between the pressure cap 9 and the valve cylinder 8. The torsion spring 12 is used to give the pressure cap 9 a tendency to close the passage of the valve cylinder 8.

[0083] The manufacturing method of the integrated ICV valve provided in this embodiment enables the valve cylinder 8 and the filling neck pipe 1 to be integrally molded into a single structure through injection molding, thereby improving the connection strength and sealing effect between the valve cylinder 8 and the filling neck pipe 1.

[0084] Specifically, the metal filler neck 1 is manufactured by means of CNC lathe or other methods. The end of the filler neck 1 used to connect to the valve cylinder 8 is provided with a radially outward flange 101. A knurled structure is machined on the inner and / or outer surfaces of the flange 101 to enhance the reliability of the connection between the formed valve cylinder 8 and the filler neck 1.

[0085] The injection mold is closed to clamp the fuel neck tube 1. The injection mold includes a rear mold 2, a front mold 3 and a positioning mechanism. The rear mold 2 is provided with a mounting hole 21 for mounting the fuel neck tube 1. The front mold 3 is provided with a clearance hole 311 corresponding to the fuel neck tube 1 and abuts against the end of the fuel neck tube 1 away from the rear mold 2. The positioning mechanism includes a core 41 and a positioning rod 42. The core 41 is provided in the mounting hole 21 and the end of the core 41 is adapted to extend into the fuel neck tube 1 and abut against the inner wall of the fuel neck tube 1 for sealing. The positioning rod 42 is fixedly connected to the front mold 3. The end of the positioning rod 42 is adapted to extend into the fuel neck tube 1 through the clearance hole 311 and abut against the end of the core 41. The inner wall of the mounting hole 21, the outer wall of the core 41 and the surface of the fuel neck tube 1 surround to form a cavity 6 for injection molding the valve cylinder 8. The oil neck tube 1 is positioned by setting the core 41 and the positioning rod 42, and cooperates with multiple mold closing stages with different pressures and mold closing speeds to ensure the precise positioning and stable clamping of the oil neck tube 1 in the injection mold, effectively preventing the oil neck tube 1 from shifting or deforming during mold closing or injection.

[0086] The injection mold is first opened to allow the end of the filler neck 1 containing the valve cylinder 8 to be injection molded into the mounting hole 21. The end of the core 41 extends into the filler neck 1, and the outer peripheral wall of the core 41 abuts and seals against the inner peripheral wall of the filler neck 1. This serves two purposes: firstly, to seal the cavity 6, and secondly, to effectively prevent the filler neck 1 from shifting during mold closing and high-pressure injection. Figure 12 As shown, a portion of the outer peripheral wall of the filler neck 1 abuts and seals against a section of the inner peripheral wall of the mounting hole 21, and a gap exists between the end region of the filler neck 1 and the inner wall of the mounting hole 21. This allows the inner wall of the mounting hole 21, the end of the filler neck 1, and the outer peripheral wall of the core 41 to enclose and form a cavity 6, which partially overlaps with the mounting hole 21. A flange 101 is provided to facilitate connection between the inner and outer walls of the filler neck 1 and the valve cylinder 8.

[0087] The rear mold 2 includes a base 23 and two sliders 22. The two sliders 22 are slidably connected to the base 23 and are adapted to move relative to each other. The mounting hole 21 is formed by combining sub-mounting holes 211 respectively provided on the two sliders 22. The two corresponding sub-mounting holes 211 are close to each other to form the mounting hole 21 and abut against the outer peripheral wall of the oil neck pipe 1; the two corresponding sub-mounting holes 211 are far apart from each other to facilitate the placement and removal of the oil neck pipe 1.

[0088] An annular plate 13 is fixedly connected to the outer peripheral wall of the fuel neck 1. The annular plate 13 is used for subsequent welding to the fuel tank shell. After the injection mold is closed, the front mold 3 and the rear mold 2 abut against the annular plate 13, and the end faces of the front mold 3 and the fuel neck 1 away from the rear mold 2 abut against each other to prevent the fuel neck 1 from moving along its axial direction. The radial displacement of the fuel neck 1 is restricted by the core 41, thereby fixing the position of the fuel neck 1 and preventing the position displacement of the fuel neck 1 during the high-pressure injection process, which would cause deformation of the cavity 6. This would also prevent problems such as uneven wall thickness and poor coaxiality of the injection-molded valve cylinder 8. Among them, a positioning rod 42 is fixedly connected to the front mold 3. The positioning rod 42 extends into the interior of the fuel neck 1 through the relief hole 311 and abuts against the end of the core 41, thereby further enhancing the positional stability of the core 41. The front mold 3 includes a movable seat 31 and a cover plate 32. The movable seat 31 is adapted to approach the rear mold 2 and abut against the annular plate 13. A clearance hole 311 is formed through the movable seat 31. The cover plate 32 is fixedly connected to the side of the movable seat 31 away from the rear mold 2. The cover plate 32 is fixedly connected to the positioning rod 42. The annular plate 13 has an annular protrusion 131 that surrounds the axis of the filling neck tube 1 on the side facing the valve cylinder 8. The rear mold 2 has a positioning groove 14 corresponding to the annular protrusion 131. During the installation of the filling neck tube 1, the annular protrusion 131 is adapted to be embedded in the positioning groove 14 to limit the radial direction of the filling neck tube 1 and prevent the filling neck tube 1 from displacing in its radial direction during the injection molding process.

[0089] The rear mold 2 is also provided with multiple guide pillars 5, and the front mold 3 is provided with sliding holes corresponding to the guide pillars 5, so as to improve the stability of mold closing.

[0090] Traditional split structures require a sealing gasket at the connection between the fuel neck 1 and the valve cylinder 8. However, the injection molding method, with its fully fitted contact surfaces and larger contact area, reduces the stress per unit area. This not only enhances the sealing effect and service life of the connection but also eliminates the need for a sealing gasket, saving on the process.

[0091] The injection mold has an injection channel 7, which forms a feed port on the mold. The nozzle of the injection molding machine is connected to the feed port. The nozzle of the injection molding machine is heated to a preset temperature before injection. Along the injection direction, multiple temperature segments are formed on the nozzle, including a first temperature segment, a second temperature segment, a third temperature segment, and a fourth temperature segment. The temperature of the first temperature segment is 200℃, the temperature of the second temperature segment is 195℃, the temperature of the third temperature segment is 190℃, and the temperature of the fourth temperature segment is 160℃.

[0092] During the mold opening process after the pressure holding is completed, the front mold 3 moves away from the rear mold 2, and the two sliders 22 move away from each other in a direction that makes it easier to remove the oil neck tube 1 and the valve cylinder 8 that is injection molded at its end.

[0093] In one embodiment, the injection process includes a first injection stage and a second injection stage. The injection pressure in the first injection stage is 60 bar to 80 bar, and the injection speed is 8 mm / s to 12 mm / s. The injection pressure in the second injection stage is 60 bar to 80 bar, and the injection speed is 18 mm / s to 22 mm / s.

[0094] The pressure holding process adopts an additive pressure holding method, including a first pressure holding stage and a second pressure holding stage. The injection pressure in the first pressure holding stage is 70 bar-90 bar, which is held for 1 second-3 seconds before transitioning to the second pressure holding stage. The injection pressure in the second pressure holding stage is 75 bar-95 bar, and the holding time in the second pressure holding stage is 2 seconds-4 seconds. The injection pressure in the second pressure holding stage must be greater than that in the first pressure holding stage. The transition time from the first pressure holding stage to the second pressure holding stage is 3 seconds-5 seconds.

[0095] The manufacturing method of the integrated ICV valve provided in this embodiment uses a lower speed in the first injection stage to ensure that the melt smoothly fills the cavity 6, effectively expelling the gas in the cavity 6 and avoiding defects such as trapped gas and scorching caused by excessive injection speed. A higher speed is used in the second injection stage to quickly complete the filling of the remaining portion, preventing the previously injected melt from cooling prematurely and causing cold runner marks, thus ensuring the integrity of the valve cylinder 8's appearance and the uniformity of its internal texture. Through two pressure-increasing holding stages, it is beneficial to better replenish the melt to the depth of the cavity 6, compensating for the volume shrinkage during the solidification process of the plastic's cold zone, thereby making the injection molded product more compact and preventing problems such as shrinkage, porosity, and cracks. If the holding time is too short, the melt has not yet formed an effective skin, resulting in poor shrinkage compensation; if the holding time is too long, the gate may have solidified and lost its shrinkage compensation ability. Switching within this holding time range helps to ensure a smooth transition from the first stage, which is mainly focused on compaction, to the second stage, which is mainly focused on compensating for shrinkage, while the melt still has good fluidity.

[0096] In one embodiment, mold closing is divided into multiple stages, including a first mold closing stage, a second mold closing stage, a third mold closing stage, a low-pressure mold closing stage, and a high-pressure mold closing stage; the mold closing pressure in the first mold closing stage is 60 bar-80 bar, and the mold closing speed is 47 mm / s-53 mm / s; the mold closing pressure in the second mold closing stage is 50 bar-70 bar, and the mold closing speed is 37 mm / s-43 mm / s; the mold closing pressure in the third mold closing stage is 20 bar-40 bar, and the mold closing speed is 32 mm / s-38 mm / s; the mold closing pressure in the low-pressure mold closing stage is 1 bar-13 bar, and the mold closing speed is 1 mm / s-6 mm / s; and the mold closing pressure in the high-pressure mold closing stage is 125 bar-145 bar, and the mold closing speed is 32 mm / s-38 mm / s.

[0097] The mold-making process is divided into several stages, including the first, second, third, fourth, and fifth mold-making stages. The mold-making pressure in the first stage is 90-110 bar, and the mold-making speed is 28-32 mm / s. The mold-making pressure in the second stage is 60-80 bar, and the mold-making speed is 23-27 mm / s. The mold-making pressure in the third stage is 35-55 bar, and the mold-making speed is 43-47 mm / s. The mold-making pressure in the fourth stage is 20-40 bar, and the mold-making speed is 33-37 mm / s. The mold-making pressure in the fifth stage is 5-25 bar, and the mold-making speed is 8-12 mm / s.

[0098] The method for manufacturing the integrated ICV valve provided in this embodiment helps to ensure the stability of the clamping process of the oil neck pipe 1 by setting different clamping speeds and clamping pressures for different clamping stages. By setting an extremely low-speed and extremely low-pressure clamping stage before high-pressure clamping, a buffer protection stage is formed before the final high-pressure clamping. Furthermore, by setting multiple mold opening stages, the mold opening pressure and speed are gradually varied, which helps to achieve smooth and damage-free mold opening.

[0099] Specifically, during mold closing, the front mold 3 moves closer to the rear mold 2. Rapid approach is achieved in the first mold closing stage, while buffering and deceleration occur in the second and third mold closing stages. The pressure in the low-pressure mold closing stage is only enough to overcome the frictional force of the moving front mold 3. If there are foreign objects between the front mold 3 and the rear mold 2, or on the lubrication neck 1, the front mold 3 will immediately stop moving to avoid damaging the mold or the lubrication neck 1, acting as a safety measure to improve production safety. After safe alignment, the injection mold is locked in the high-pressure mold closing stage, preparing for subsequent injection.

[0100] In one embodiment, combined Figure 7 and Figure 9 As shown, a limiting structure is provided between the positioning rod 42 and the core 41. The limiting structure includes a protrusion 11 and a groove 10 respectively provided on the core 41 and the positioning rod 42. The protrusion 11 is adapted to be embedded in the groove 10.

[0101] The method for manufacturing an integrated ICV valve provided in this embodiment provides a limiting structure between the ends of the positioning rod 42 and the core 41 to ensure the abutment stability of the positioning rod 42 and the core 41, prevent the core 41 from shifting during the injection molding process, avoid deformation of the cavity 6, and help ensure the reliability of the sealing abutment between the core 41 and the valve cylinder 8.

[0102] Specifically, the protrusion 11 is frustum-shaped, and the diameter of the frustum gradually decreases along the direction close to the rear mold 2. The shape of the groove 10 is adapted to the shape of the protrusion 11.

[0103] According to an embodiment of the present invention, another aspect provides a metal oil tank including the aforementioned integrated ICV valve.

[0104] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. An integrated ICV valve, characterized in that, include: Refueling neck tube (1); The valve cylinder (8) is injection molded at one end of the filling neck pipe (1) so that the valve cylinder (8) and the filling neck pipe (1) are connected as an integral structure. The filling neck pipe (1) is provided with a flange (101) that extends radially outward at the end edge near the valve cylinder (8). The flange (101) is provided with a knurled structure. A pressure cap (9) is hinged to the valve cylinder (8), the pressure cap (9) being adapted to open or close the passage of the valve cylinder (8) by flipping it, and a torsion spring (12) is provided between the pressure cap (9) and the valve cylinder (8), the torsion spring (12) being used to give the pressure cap (9) a tendency to close the passage of the valve cylinder (8).

2. The integrated ICV valve according to claim 1, characterized in that, The valve cylinder (8) includes a convex wall (81) located at one end away from the refueling neck (1). A support (16) is provided on the pressure cap (9). A rotating shaft (17) is connected to the support (16). The rotating shaft (17) is connected to the convex wall (81). The pressure cap (9) is hinged to the valve cylinder through the support (16) and the rotating shaft (17). A torsion spring (12) is sleeved on the rotating shaft (17). One end of the torsion spring (12) is pressed onto the pressure cap (9), and the other end is pressed onto the convex wall (81).

3. The integrated ICV valve according to claim 2, characterized in that, The convex wall (81) is provided with a relief groove (15) for accommodating the support (16), and the rotating shaft (17) is disposed in the relief groove (15).

4. The integrated ICV valve according to claim 2, characterized in that, The cap (9) is provided with a flow guiding structure on the side facing the inside of the refueling neck (1). The flow guiding structure includes a plurality of parallel and spaced protrusions (19). The length direction of the protrusions (19) is perpendicular to the axis direction of the rotating shaft (17).

5. The integrated ICV valve according to claim 4, characterized in that, The flow guiding structure also includes a stop wall (20), which is fixedly connected to one end of the plurality of protrusions (19) away from the torsion spring (12).

6. The integrated ICV valve according to claim 5, characterized in that, The side of the stop wall (20) near the protruding edge (19) is constructed as a first inclined surface (201).

7. A metal fuel tank, characterized in that, include: The integrated ICV valve according to any one of claims 1 to 6.

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