Oil inlet metering valve capable of completely cutting off oil

Abstract

The utility model relates to an oil inlet metering valve capable of completely cutting off oil. The metering valve comprises a metering valve body, the metering valve body comprises a containing cavity arranged in the axial direction, part of the containing cavity forms a fuel oil flow channel, and an oil inlet hole is formed in the side wall of the metering valve body in the radial direction; the metering valve element is movably connected into the containing cavity in the axial direction and can enable the oil inlet hole and the fuel oil flow channel to be communicated or separated; the first sealing element is arranged between the accommodating cavity and the metering valve core and is in sliding contact with the side wall of the accommodating cavity; the spring seat is arranged in the containing cavity, and the spring seat is provided with an oil outlet hole communicated with the fuel oil flow channel; the second sealing element is arranged between the interior of the accommodating cavity and the spring seat and is arranged relative to the metering valve core; the compression spring is arranged between the metering valve element and the spring seat so as to provide force for the metering valve element to be far away from the spring seat; the electromagnetic driving assembly can provide force for the metering valve element to get close to the spring seat. According to the utility model, complete fuel cut-off can be realized, and no fuel leakage is realized, so that system control and safety are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of metering valves, in particular to an inlet metering valve capable of completely cutting off fuel supply. Background Art

[0002] The application of the inlet metering valve in the engine fuel supply system is to generate electromagnetic force when the electromagnet component is energized, drive the armature component to move, and then adjust the opening amount of the valve port to achieve proportional control of the fuel flow. However, due to the structural limitations of the existing inlet metering valve, in some specific situations (such as the fuel cut-off condition), although the valve port has been completely closed, there may still be a small amount of fuel leakage, resulting in out-of-control rail pressure at low loads.

[0003] Therefore, it is urgent to develop an inlet metering valve capable of completely cutting off fuel supply to ensure that fuel does not leak in the closed state, thereby ensuring the normal control and safety of the system. Summary of the Invention

[0004] For this reason, the utility model provides an inlet metering valve capable of completely cutting off fuel supply, which can achieve complete fuel cut-off and no fuel leakage, thus ensuring system control and safety.

[0005] To solve the above technical problems, the utility model provides an inlet metering valve capable of completely cutting off fuel supply, including:

[0006] A metering valve body, including a receiving cavity arranged axially, part of the receiving cavity constituting a fuel flow channel, and an oil inlet hole arranged radially on the side wall of the metering valve body;

[0007] A metering valve core, axially movably connected in the receiving cavity and capable of communicating or blocking the oil inlet hole and the fuel flow channel;

[0008] A first sealing member, arranged between the receiving cavity and the metering valve core and in sliding contact with the side wall of the receiving cavity;

[0009] A spring seat, arranged in the receiving cavity, and the spring seat is provided with an oil outlet hole communicating with the fuel flow channel;

[0010] A second sealing member, arranged in the receiving cavity between the spring seat and opposite to the metering valve core;

[0011] A compression spring, arranged between the metering valve core and the spring seat to provide a force for the metering valve core to move away from the spring seat;

[0012] An electromagnetic drive assembly, capable of providing a force for the metering valve core to move close to the spring seat;

[0013] Wherein, the metering valve core can be driven by the electromagnetic driving assembly to move towards the spring seat, so as to simultaneously seal the oil inlet hole and the fuel flow channel and be in sealed contact with the second seal.

[0014] In an embodiment of the present utility model, an installation groove is arranged on the outer peripheral side of the metering valve core, and the first seal is fitted in the installation groove.

[0015] In an embodiment of the present utility model, a limiting step is arranged on the side wall of the accommodating cavity. One axial end of the second seal abuts against the spring seat, a part of the other axial end of the second seal abuts against the limiting step, and the other part extends beyond the limiting step and can form a sealing surface after contacting the end of the metering valve core.

[0016] In an embodiment of the present utility model, the metering valve core includes a first accommodating hole, the spring seat includes a second accommodating hole communicated with the oil outlet hole, and the two axial ends of the compression spring respectively abut against the bottom ends of the first accommodating hole and the second accommodating hole.

[0017] In an embodiment of the present utility model, an oil guiding hole is arranged at the bottom end of the first accommodating hole.

[0018] In an embodiment of the present utility model, the spring seat is in interference fit with the accommodating cavity.

[0019] In an embodiment of the present utility model, the oil outlet hole axially penetrates through the spring seat.

[0020] In an embodiment of the present utility model, the electromagnetic driving assembly includes a pole shoe component, an armature component and an electromagnet component. The pole shoe component is sleeved outside the armature component, the electromagnet component is sleeved outside the pole shoe component, the armature component is matched with the electromagnet component and can axially move along the inner hole of the pole shoe component, and the armature component is connected with the metering valve core.

[0021] In an embodiment of the present utility model, the metering valve body is in interference fit with the pole shoe component.

[0022] In an embodiment of the present utility model, the armature component includes a driving rod connected with the metering valve core.

[0023] The above technical solution of the present utility model has the following advantages compared with the prior art:

[0024] A fuel inlet metering valve capable of completely cutting off fuel according to the present utility model realizes comprehensive two-way sealing by providing a first seal and a second seal. The first seal is in sliding contact between the metering valve core and the side wall of the accommodating cavity, and can seal the fuel flowing upward. The second seal ensures complete blocking of the fuel leaking downward through the cooperation with the spring seat and the metering valve core, so as to achieve complete sealing of the inlet valve in the fuel cut-off state, ensure no fuel leakage, and greatly improve the sealing performance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments of the present utility model in conjunction with the accompanying drawings.

[0026] Figure 1 Schematic diagram of the initial state of the fuel inlet metering valve of the present utility model.

[0027] Figure 2 Schematic diagram of the closed state of the fuel inlet metering valve of the present utility model.

[0028] Figure 3 is Figure 2 Partial schematic diagram at position A in

[0029] Figure 4 is Figure 2 Partial schematic diagram at position B in

[0030] Description of reference numerals in the drawings of the specification:

[0031] 1. Metering valve body; 2. First seal; 3. Metering valve core; 4. Second seal; 5. Compression spring; 6. Spring seat; 7. Armature component; 8. Electromagnet component; 9. Pole shoe component; 101. Fuel inlet hole; 102. Fuel flow channel; 301. Diversion hole; 401. Sealing surface; 601. Fuel outlet hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and implement it, but the embodiments cited are not intended to limit the present utility model.

[0033] In the present utility model, when directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present utility model, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0034] In the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and "greater than", "less than", "exceeding", etc. are understood as not including the corresponding number; "above", "below", "within", etc. are understood as including the corresponding number. In the description of the present utility model, if "first" and "second" are described, they are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0035] In the present utility model, unless otherwise clearly defined, terms such as "arranged", "installed", "connected", etc. should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in the present utility model in combination with the specific content of the technical solution.

[0036] Referring to Figure 1 As shown, an oil inlet metering valve capable of completely cutting off oil in the present utility model includes:

[0037] A metering valve body 1, including a receiving cavity arranged along the axial direction, a part of the receiving cavity constituting a fuel flow channel 102, and an oil inlet hole 101 arranged radially on the side wall of the metering valve body 1;

[0038] A metering valve core 3, movably connected along the axial direction in the receiving cavity and capable of communicating or cutting off the oil inlet hole 101 and the fuel flow channel 102; the metering valve core 3 and the receiving cavity are in clearance fit;

[0039] A first sealing member 2, arranged between the receiving cavity and the metering valve core 3 and in sliding contact with the side wall of the receiving cavity; capable of sealing the fuel that surges upward and preventing fuel leakage;

[0040] A spring seat 6, arranged in the receiving cavity, and the spring seat 6 is provided with an oil outlet hole 601 communicating with the fuel flow channel 102;

[0041] A second sealing member 4, arranged in the receiving cavity between the spring seat 6 and arranged opposite to the metering valve core 3;

[0042] A compression spring 5, arranged between the metering valve core 3 and the spring seat 6 to provide a force for the metering valve core 3 to move away from the spring seat 6;

[0043] An electromagnetic drive assembly, capable of providing a force for the metering valve core 3 to move close to the spring seat 6;

[0044] Among them, the metering valve core 3 can be driven by the electromagnetic drive assembly to move towards the direction close to the spring seat 6, so as to simultaneously seal the fuel inlet hole 101 and the fuel flow channel 102 and be in sealed contact with the second seal 4, and can prevent the leaked fuel from entering the fuel flow channel 102 from the fuel inlet hole 101.

[0045] By arranging the first seal 2 and the second seal 4, the complete fuel cut-off of the fuel inlet metering valve can be realized, fuel leakage can be avoided, system control and safety can be guaranteed, and at the same time, the cost can also be reduced.

[0046] In one embodiment, referring to Figure 4 As shown, an installation groove is arranged on the outer peripheral side of the metering valve core 3, and the first seal 2 is fitted in the installation groove.

[0047] Referring to Figure 3 As shown, a limiting step is arranged on the side wall of the accommodating cavity. One axial end of the second seal 4 abuts against the spring seat 6, a part of the other axial end of the second seal 4 abuts against the limiting step, and the other part extends beyond the limiting step and can form a sealing surface 401 after contacting the end of the metering valve core 3.

[0048] In one embodiment, the metering valve core 3 includes a first accommodating hole, the spring seat 6 includes a second accommodating hole communicated with the oil outlet hole 601, and the two axial ends of the compression spring 5 respectively abut against the bottom ends of the first accommodating hole and the second accommodating hole.

[0049] In one embodiment, in order to ensure that there is no pressure difference between the upper and lower parts of the metering valve core 3, a oil guiding hole is arranged at the bottom end of the first accommodating hole, eliminating the pressure difference between the upper and lower parts of the metering valve core 3 and ensuring that the valve core is more stable during the movement process.

[0050] Specifically, the spring seat 6 is in interference fit with the accommodating cavity.

[0051] Specifically, the oil outlet hole 601 axially penetrates through the spring seat 6.

[0052] In one embodiment, referring to Figure 1 As shown, the electromagnetic drive assembly includes a pole shoe component 9, an armature component 7 and an electromagnet component 8. The pole shoe component 9 is sleeved outside the armature component 7, the electromagnet component 8 is sleeved outside the pole shoe component 9. The armature component 7 cooperates with the electromagnet component 8 and can axially move along the inner hole of the pole shoe component 9, and the armature component 7 is connected to the metering valve core 3.

[0053] Specifically, the metering valve body 1 is in interference fit with the pole shoe component 9.

[0054] Specifically, the armature component 7 includes a drive rod connected to the metering valve core 3.

[0055] Working principle:

[0056] Refer to Figure 1 、 Figure 2 As shown, the fuel inlet metering valve mainly controls the opening size of the fuel inlet hole 101 by changing the magnitude of the current applied to the electromagnet. When the electromagnet component 8 is not energized, the fuel inlet hole 101 is fully opened, and fuel enters the fuel flow passage 102 through the fuel inlet hole 101 and then enters the system from the fuel outlet hole 601; when the electromagnet component 8 is energized, the armature component 7 drives the metering valve core 3 to move downward, the spring force of the compression spring 5 increases, and as the current increases, the metering valve core 3 continues to move downward, and the fuel inlet hole 101 is gradually closed; when the current increases to about 1.4 A, the lower end surface of the metering valve core 3 contacts the upper end surface of the non-metallic gasket. Under specific conditions (fuel cut-off), when the current continues to increase, the greater the pressing force on the sealing surface 401, the better the sealing effect, and the fuel leaking downward can be completely sealed; at the same time, the first seal 2 can completely seal the fuel flowing upward, and complete fuel cut-off can be achieved. When powered off, the electromagnetic force of the electromagnet disappears, and the metering valve core 3 resets under the spring force of the compression spring 5.

[0057] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An oil inlet metering valve capable of completely cutting off oil flow, characterized in that: include: A metering valve body (1) comprises a containing cavity arranged along the axial direction, a part of the containing cavity forming a fuel flow channel (102), and a side wall of the metering valve body (1) is provided with a fuel inlet hole (101) along the radial direction; A metering valve core (3) movably connected in the accommodating cavity along the axial direction and capable of connecting or disconnecting the oil inlet hole (101) and the fuel flow channel (102); A first sealing member (2) is disposed between the accommodating chamber and the metering valve core (3) and is in sliding contact with a side wall of the accommodating chamber; A spring seat (6) is arranged in the accommodating cavity, and the spring seat (6) is provided with an oil outlet hole (601) communicating with the fuel flow channel (102); A second sealing member (4) is arranged between the accommodating cavity and the spring seat (6) and is arranged opposite to the metering valve core (3); A compression spring (5) is arranged between the metering valve core (3) and the spring seat (6) to provide a force for the metering valve core (3) to move away from the spring seat (6); An electromagnetic drive assembly capable of providing a force for the metering valve core (3) to approach the spring seat (6); The metering valve core (3) can be driven by the electromagnetic drive assembly to move in a direction close to the spring seat (6) so as to seal the oil inlet hole (101) and the fuel flow channel (102) while being in sealing contact with the second sealing member (4).

2. The oil inlet metering valve capable of completely cutting off oil according to claim 1, characterized in that: The outer peripheral side of the metering valve core (3) is provided with a mounting groove, and the first sealing member (2) is embedded in the mounting groove.

3. The oil inlet metering valve capable of completely cutting off oil according to claim 1, characterized in that: A limiting step is provided on the side wall of the accommodating cavity, one axial end of the second sealing member (4) abuts against the spring seat (6), a portion of the other axial end of the second sealing member (4) abuts against the limiting step, and another portion extends beyond the limiting step and is capable of contacting the end of the metering valve core (3) to form a sealing surface (401).

4. The oil inlet metering valve capable of completely cutting off oil according to claim 1, characterized in that: The metering valve core (3) comprises a first accommodating hole, the spring seat (6) comprises a second accommodating hole communicated with the oil outlet hole (601), and the axial ends of the compression spring (5) respectively abut against the bottom ends of the first accommodating hole and the second accommodating hole.

5. The oil inlet metering valve capable of completely cutting off oil according to claim 4, characterized in that: An oil guide hole is arranged at the bottom end of the first accommodating hole.

6. The oil inlet metering valve capable of completely cutting off oil according to claim 1, characterized in that: The spring seat (6) is interference fit with the accommodating cavity.

7. The oil inlet metering valve capable of completely cutting off oil according to claim 1, characterized in that: The oil outlet hole (601) penetrates the spring seat (6) in the axial direction.

8. The oil inlet metering valve capable of completely cutting off oil according to claim 1, characterized in that: The electromagnetic drive assembly comprises a pole shoe component (9), an armature component (7) and an electromagnet component (8); the pole shoe component (9) is sleeved outside the armature component (7); the electromagnet component (8) is sleeved outside the pole shoe component (9); the armature component (7) cooperates with the electromagnet component (8) and is able to move axially along the inner hole of the pole shoe component (9); and the armature component (7) is connected to the metering valve core (3).

9. The oil inlet metering valve capable of completely cutting off oil according to claim 8, characterized in that: The metering valve body (1) and the pole shoe component (9) are interference fit.

10. The oil inlet metering valve capable of completely cutting off oil according to claim 8, characterized in that: The armature component (7) comprises a drive rod connected to the metering valve core (3).

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