WO2021077626A1 - 气门芯及氮气弹簧 - Google Patents

气门芯及氮气弹簧 Download PDF

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Publication number
WO2021077626A1
WO2021077626A1 PCT/CN2020/070084 CN2020070084W WO2021077626A1 WO 2021077626 A1 WO2021077626 A1 WO 2021077626A1 CN 2020070084 W CN2020070084 W CN 2020070084W WO 2021077626 A1 WO2021077626 A1 WO 2021077626A1
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WO
WIPO (PCT)
Prior art keywords
core rod
core
elastic
hole
valve core
Prior art date
Application number
PCT/CN2020/070084
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English (en)
French (fr)
Inventor
孙鹏
钟礼宝
赵文青
徐发明
臧贻照
逄金鹏
王艺璇
Original Assignee
高密同创气门芯有限公司
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Application filed by 高密同创气门芯有限公司 filed Critical 高密同创气门芯有限公司
Publication of WO2021077626A1 publication Critical patent/WO2021077626A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/43—Filling or drainage arrangements, e.g. for supply of gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/20—Check valves specially designed for inflatable bodies, e.g. tyres

Definitions

  • This application relates to the field of exhaust technology, for example, to a valve core and a nitrogen gas spring.
  • the valve core is one of the important parts of the nitrogen gas spring, which directly affects the performance and safety performance of the gas spring.
  • the nitrogen gas spring is inflated through the valve core, the spring of the valve core is prone to detach from the core rod, causing safety accidents.
  • the present application provides a valve core and a nitrogen gas spring, which can solve the problem that the spring is likely to be separated from the core rod when the nitrogen gas spring is inflated through the valve core in the related art.
  • valve core including:
  • a core body, the core body is provided with an installation through hole
  • a core rod the core rod has a first end and a second end disposed opposite to each other along its axial direction, the first end penetrates into the installation through hole, the first end is provided with a fixing part, and the first end Two ends are provided with a sealing part;
  • the core rod is arranged to move between the sealing position and the inflation and deflation position along the axial direction of the installation through hole; wherein the core rod is in the sealing position, and the sealing part is in contact with the One end of the core body is sealed and fitted so that one end of the installation through hole is closed; the core rod is in the inflating and discharging position, the sealing part is separated from the core body, so that one end of the installation through hole is opened, and the gas passes through The gap between the installation through hole and the core rod circulates;
  • a limit stopper the limit stopper includes a limit body, and at least two elastic claws arranged along the circumference of the limit body;
  • the elastic member is sandwiched between the inner wall of the installation through hole and the limiting stopper, and the elastic member is configured to enable the core rod to have a tendency to move from the inflating and deflating position to the sealing position
  • the elastic claws are arranged to be elastically deformed along the radial direction of the core rod to allow the fixed portion to pass through, and hug the outer wall of the core rod so that the elastic claws abut against the fixed portion .
  • the first end is provided with a limiting card slot
  • the fixing portion is formed on the core rod on the side of the limiting card slot away from the elastic member. The free end abuts against the side wall of the limiting slot close to the fixing part.
  • the side wall of the limiting slot facing away from the fixing portion forms a first guide surface, and the first guide surface reaches the core rod in a direction from the first end to the second end.
  • the distance between the central axis gradually increases.
  • the distance from the elastic claw to the central axis of the core rod in the direction from the first end to the second end gradually increases.
  • the end of the elastic claw abutting against the fixing portion is flat.
  • the fixing portion is provided with a second guide surface at one end away from the limiting slot, and the second guide surface reaches the core rod in a direction from the first end to the second end.
  • the distance between the central axis gradually increases.
  • the circumferential width of each elastic claw gradually increases.
  • a sealing element is provided between the sealing portion and the core.
  • the inner wall of the mounting through hole is formed with a first step surface, and the elastic member is sandwiched between the first step surface and the limiting body.
  • the included angle between the elastic jaw and the central axis of the core rod is in the range of 40°-60°; and/or,
  • the included angle between the limiting body and the central axis of the core rod is in the range of 80°-100°.
  • a nitrogen gas spring is also provided, including the valve core described in any one of the above embodiments, the nitrogen gas spring is provided with a mounting hole communicating with the inner cavity of the nitrogen gas spring, and the valve core Set in the mounting hole.
  • Figure 1 is a schematic diagram of a valve core provided by related technologies
  • Figure 2 is a cross-sectional view of a valve core provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of the structure of the core rod provided by the embodiment of the present application.
  • FIG. 4 is a schematic diagram of the structure of the stopper and the core rod provided by the embodiment of the present application.
  • Figure 5 is a diagram of the inflated state of the valve core provided by the embodiment of the present application.
  • Fig. 6 is a sealing state diagram of a valve core provided by an embodiment of the present application.
  • the valve core in the related art includes a core body 10', a core rod 20' and a spring 30', the core body 10' is sleeved outside the core rod 20', and the spring 30' is sleeved on the core rod 20'
  • the axial end of the core rod 20' forms a limited step surface.
  • the width of the limit step surface is controlled within a certain range.
  • the spring 30' has a large diameter end and a small diameter.
  • the large-diameter end of the spring 30′ is sleeved on the core rod 20′ from the core rod 20′ where the limit step surface is provided, and is positioned away from the core rod 20′ along the axial direction of the spring 30′.
  • One end of the step surface presses the small-diameter end of the spring 30', and the small-diameter end of the spring 30' will gradually deform to increase its outer diameter, so that the spring 30' is entirely sleeved on the core rod 20' and passes the limit.
  • the position step faces the small diameter end of the spring 30' to limit the position.
  • the spring 30' When the cylinder of the nitrogen gas spring is inflated, the spring 30' will be compressed under the action of the high-pressure gas, so that the core rod 20' will overcome the spring force to move downward in Figure 1, and the core rod 20' is sealed at one end The part is separated from the core 10', and the gas passes through the gap between the core 10' and the sealing part and the core rod 20'. In this process, the spring 30' and the core rod 20' are prone to deflection, resulting in deformation of the small diameter end of the spring 30'. At this time, it is very easy to cause the limit effect of the limit step surface to fail and the spring 30' to separate from the core rod.
  • this embodiment provides a valve core, which can be applied to a nitrogen gas spring.
  • the following takes a valve core applied to a nitrogen gas spring as an example to describe the specific structure of the valve core in detail.
  • the above-mentioned valve core includes a core body 1, a core rod 2, an elastic member 3, and a limit stopper 4.
  • the core body 1 is provided with a mounting through hole 10, and the mounting through hole 10 is arranged in order along its axial direction and the diameter of the hole increases successively. ⁇ first hole 11, second hole 12 and third hole 13.
  • the core rod 2 has a first end and a second end arranged opposite to each other along its axial direction.
  • the second end of the core rod 2 is provided with a sealing portion 21.
  • the sealing portion 21 may be disc-shaped, and the sealing portion 21 The outer diameter of is greater than the outer diameter of the first hole 11, and the core rod 2 is arranged to move between the sealing position and the inflation and deflation position along the axial direction of the mounting through hole 10. Wherein, the core rod 2 is in the sealing position, and the sealing portion 21 is in a sealing fit with one end of the core 1 so that one end of the installation through hole 10 is closed.
  • the first end penetrates into the installation through hole 10 through the first hole 11, so that the sealing portion 21 can abut against the end surface of the first hole 11, so as to realize the gap between the sealing portion 21 and the end of the core 1 , So that one end of the installation through hole 10 is closed.
  • the above-mentioned sealing portion 21 and the core rod 2 are integrally formed, and other connection methods, such as threaded connection, welding, clamping, etc., may also be used to connect the sealing portion 21 to the second end of the core rod 2.
  • a sealing member 5 is provided between the sealing portion 21 and the core 1.
  • the above-mentioned sealing member 5 is a sealing ring.
  • the outer wall of the core 1 connected to the second end of the core rod 2 is stepped, including the steps from the second end of the core rod 2 to the first end of the core rod 2 and the outer diameter increases successively. The first stepped column, the second stepped column and the third stepped column.
  • the sealing member 5 is provided with a stepped hole, and the sealing member 5 is sleeved outside the core 1 so that the first stepped surface formed in the stepped hole abuts against the second stepped surface formed by the first stepped column and the second stepped column, and The inner wall of the large-diameter hole of the stepped hole abuts against the outer wall of the second stepped column.
  • the above-mentioned sealing element 5 can be installed on the core 1 by press fitting, and the positioning of the sealing element 5 can be realized to ensure the sealing performance.
  • the outer diameter of the sealing portion 21 is larger than the outer diameter of the first hole 11 and larger than the inner diameter of the end of the sealing member 5 close to the sealing portion 21, it can also be provided on the end surface of the sealing portion 21 facing the core 1
  • the seal 5 is sandwiched between the core 1 and the sealing portion 21 by moving the core rod 2 in the axial direction. It is also possible to set the opening end of the first hole 11 as a divergent tapered hole, and set the outer surface of the sealing portion 21 as a tapered surface, and the tapered surface cooperates with the divergent tapered hole to realize the sealing of the first hole 11 Seal between parts 21.
  • the sealing element 5 can also be directly provided on the end surface of the core 1 facing the sealing portion 21, and the sealing element 5 is sandwiched between the core 1 and the sealing portion 21 by axially moving the core rod 2.
  • the core rod 2 is in the inflating and discharging position, the sealing portion 21 is separated from the core body 1, so that the first hole is opened, and the gas circulates through the gap between the installation through hole 10 and the core rod 2.
  • the diameter of the first hole 11 is larger than the outer diameter of the core rod 2 inserted in the first hole 11, so that the gas can circulate through the gap between the core rod 2 and the installation through hole 10.
  • the above-mentioned elastic member 3 is sleeved outside the core rod 2 and is arranged so that the core rod 2 has a tendency to move from the inflated and deflated position to the sealed position.
  • the above-mentioned elastic member 3 is a spring.
  • the first end of the core rod 2 is provided with a fixing portion 22, and the limiting block 4 is provided between the fixing portion 22 and the elastic member 3, and the elastic member 3 is limited by the limiting block 4 to prevent the elastic member 3 from escaping from the core Rod 2.
  • the spring in this embodiment can be a conventional spring, and there is no need to use a spring with a large diameter end and a small diameter end.
  • the limit stopper 4 can be set with a larger outer diameter to form a more effective spring.
  • the limit prevents the core rod 2 from detaching from the core body.
  • the fixing portion 22 and the core rod 2 are integrally formed, and other connection methods, such as threaded connection, welding, clamping and the like, can also be used to connect the fixing portion 22 to the first end of the core rod 2.
  • the first end of the core rod 2 is provided with a limiting slot 23, and the core rod 2 on the side of the limiting slot 23 facing away from the elastic member 3 forms a fixing portion 22.
  • the above-mentioned limiting slot 23 is an annular groove.
  • the limit stopper 4 includes a limit body 41 and at least two elastic claws 42 arranged at intervals along the circumferential direction of the limit body 41.
  • a first step surface is formed between the first hole 11 and the second hole 12, one end of the elastic member 3 abuts on the first step surface, and the other end abuts on the side of the limiting body 41 facing away from the elastic claw 42;
  • the claw 42 can be elastically deformed in the radial direction of the core rod 2 to allow the fixing portion 22 to pass through, and hug the outer wall of the core rod 2 so that the elastic claw 42 abuts against the fixing portion 22.
  • the elastic member 3 is limited by the first step surface and the limiting body 41, so as to prevent the elastic member 3 from directly contacting the elastic claw 42 to cause the elastic claw 42 to expand radially outward along the core rod 2, resulting in the limiting baffle 4
  • the problem of deterioration of the limit function occurs.
  • the above-mentioned limiting body 41 may be a ring structure or other structure that can penetrate the core rod 2.
  • the distance from the elastic claw 42 to the central axis of the core rod 2 in the direction from the first end to the second end gradually increases.
  • the included angle between the elastic jaw 42 and the central axis of the core rod 2 is within the range of 40°-60°, and/or the included angle between the limiting body 41 and the central axis of the core rod 2 is within the range of 80°-100° Inside.
  • the limit body 41 When installing the above-mentioned limit block 4, the limit body 41 is sleeved on the fixed portion 22, and an external force is applied from the first end of the core rod 2 to the second end of the core rod 2, so that the limit block 4 moves along the core
  • the rod 2 moves axially, and the elastic claw 42 will expand radially under the action of the fixed portion 22.
  • the limit stopper 4 After the limit stopper 4 enters the limit slot 23, the elastic deformation of the elastic claw 42 disappears, and the elastic clamping The claw 42 will hold the outer wall of the core rod 2 where the limit card slot 23 is located under the effect of the remaining elastic deformation; the limit stopper 4 is easier to deform during the installation process, and the installation process resistance is reduced compared with the flat limit stopper.
  • the elastic member 3 will squeeze the limit stopper 4, so that the elastic claw 42 further hugs the outer wall of the core rod 2, and there is not only an axial direction between the free end of the elastic claw 42 and the outer wall of the core rod 2. It also has a radial force directed to the central axis of the core rod 2. At the same time, the free end of the elastic pawl 42 will abut against the side wall of the limit slot 23 close to the fixed portion 22, making it difficult for the limit stop piece 4 to escape from the core rod. 2; After the limit stopper 4 is installed on the core rod 2, the elastic claws of the elastic member 3 have a completely opposite direction of deformation during the installation process.
  • the elastic claws 42 are not easy to deform in the opposite direction, turn out, or detach from the core rod 2 , It can form a more effective limit to the spring 3, and the detachment rate of the core rod 2 of the valve core in the related art is reduced by more than 90%; effectively avoiding the radial contraction and deflection of the elastic member 3, and at the same time This effectively prevents the elastic member 3 from directly acting on the elastic claw 42 to cause the elastic claw 42 to expand outward.
  • the limit stopper 4 provided in this embodiment not only has a limit effect on the elastic member 3, but also has a simple structure and is easy to install; and when the elastic member 3 squeezes the limit stopper 4, the elastic claw 42 is not easy to reverse. It is deformed and turned outwards, and the elastic claw 42 hugs the outer wall of the core rod 2 so that the elastic member 3 is difficult to be separated from the core rod 2.
  • the present application can configure the elastic claw 42 to make the elastic deformation of the elastic claw 42 disappear completely after the limit stopper 4 enters the limit card slot 23, and then the elastic member is used to squeeze 3 Squeeze the limit stopper 4 to make the elastic claw 42 elastically deform and hold the outer wall of the core rod 2 where the limit card slot 23 is located. At the same time, the free end of the elastic claw 42 will abut against the limit card slot 23 close to The side wall of the fixed portion 22.
  • the included angle between the limiting body 41 and the central axis of the core rod 2 is 90°, which improves the effect of the limiting baffle 4.
  • the free end of the elastic claw 42 and the outer wall of the core rod 2 not only have an axial force, but also have a radial force pointing to the central axis of the core rod 2, so that the limit stopper 4 It is more difficult to break away from the core rod 2, and a reliable limit to the elastic member 3 is realized.
  • the above-mentioned elastic claws 42 are provided with three, and the three elastic claws 42 are evenly distributed along the circumferential direction of the limiting body 41 to ensure that the entire elastic claw 42 is uniformly stressed and simplify the adjustment of the limiting baffle 4
  • the structure reduces the difficulty of processing.
  • the three elastic claws 42 are distributed at intervals, when inflating and discharging, the gas can pass through the limiting baffle 4 through the gap between two adjacent elastic claws 42.
  • the above-mentioned elastic claws 42 may also be provided with four, five or more.
  • a second stepped surface is formed between the second hole 12 and the third hole 13, and the aperture of the second hole 12 is smaller than the outer diameter of the limiting body 41, and the second step faces
  • the limiting body 41 performs limiting to protect the elastic claw 42 and prevent the elastic claw 42 from being permanently deformed and failing.
  • a first guide surface 24 is formed on the side wall of the stopper slot 23 away from the fixed portion 22, and the first guide surface 24 extends along the first end. The distance from the direction to the second end to the central axis of the core rod 2 gradually increases.
  • the above-mentioned first guiding surface 24 not only has a guiding function, but also can effectively prevent the inner wall of the elastic claw 42 from directly colliding with the corners and damaging the elastic claw 42.
  • the above-mentioned first guide surface 24 is a conical surface.
  • the included angle between the generatrix of the conical surface and the central axis of the core rod 2 is in the range of 40°-60°.
  • the included angle between the first guide surface 24 and the central axis of the core rod 2 is greater than or equal to the minimum included angle between the elastic claw 42 and the central axis of the core rod 2, ensuring that the first guide surface 24 can face each other.
  • the elastic deformation of the elastic pawl 42 serves as a guide.
  • the minimum included angle between the elastic claw 42 and the central axis of the core rod 2 is equal to the included angle between the first guide surface 24 and the central axis of the core rod 2.
  • the end of the elastic pawl 42 abutting the fixed portion 22 is flat, which increases the contact area between the free end of the elastic pawl 42 and the fixed portion 22, and improves the fixing portion 22 to the elastic pawl 42.
  • the firmness of the limit is flat, which increases the contact area between the free end of the elastic pawl 42 and the fixed portion 22, and improves the fixing portion 22 to the elastic pawl 42. The firmness of the limit.
  • the end of the fixing portion 22 away from the limiting slot 23 is provided with a second guide surface 25, and the second guide surface 25 reaches the core along the direction from the first end of the core rod 2 to the second end of the core rod 2.
  • the distance between the central axis of the rod 2 gradually increases.
  • the included angle between the second guide surface 25 and the central axis of the core rod 2 is greater than or equal to the minimum included angle between the elastic jaw 42 and the central axis of the core rod 2.
  • the included angle between the second guide surface 25 and the central axis of the core rod 2 is equal to the minimum included angle between the elastic claw 42 and the central axis of the core rod 2.
  • the included angle between the second guide surface 25 and the central axis of the core rod 2 is in the range of 40°-60°.
  • the limit stopper 4 when the limit stopper 4 is installed, the limit stopper 4 moves from the first end to the second end of the core rod 2 in the axial direction of the core rod 2 under the action of external force, and the inner side wall of the elastic claw 42 can be It abuts against the second guide surface 25 and gradually deforms.
  • the second guide surface 25 guides the installation of the elastic claw 42 and at the same time prevents the elastic claw 42 from colliding with the sharp edge to protect the limit stop.
  • the function of the piece 4 prevents the limit stop piece 4 from being damaged.
  • each elastic claw 42 gradually increases along the direction from the first end to the second end of the core rod 2.
  • the maximum width of the contact area between each elastic pawl 42 and the limiting groove 23 near the side wall of the fixing portion 22 along the radial direction of the core rod 2 is the radial depth H of the limiting groove 23, and H can be taken as The value is 0.08mm-0.12mm.
  • the process of inflating the valve core is as follows: the core rod 2 moves in the direction from the first end to the second end (the direction of the arrow shown in FIG. 5) under the push of the external high-pressure gas, as the elastic member 3 abuts On the first step surface, the elastic member 3 will be gradually compressed, and at the same time the elastic member 3 will act on the limit stopper 4, so that the elastic pawl 42 further hugs the outer wall of the core rod 2 where the limit slot 23 is located, and makes the elastic The free end of the claw 42 abuts against the side wall of the limiting slot 23 close to the fixing portion 22.
  • the sealing portion 21 is gradually separated from the sealing member 5, a section of the first opening 11 is opened, and the high-pressure gas will pass through the gap between the core rod 2 and the first hole 11, and the sealing portion 21 and The gap between the seals 5 enters the cylinder of the nitrogen gas spring.
  • the high-pressure gas in the cylinder of the nitrogen spring will push the sealing portion 21 to move the core rod 2 in the direction from the second end to the first end (as shown in the figure) 6 arrow), as shown in Figures 2 and 6, when the sealing part 21 abuts against the sealing element 5, the sealing element 5 will form an effective seal between the sealing part 21 and the end of the core 1, so that The high-pressure gas in the cylinder of the nitrogen gas spring cannot be discharged through the gap between the core rod 2 and the first hole 11.
  • This embodiment also provides a nitrogen gas spring, including the above-mentioned valve core, the nitrogen gas spring is provided with a mounting hole communicating with the inner cavity of the nitrogen spring, and the above-mentioned valve core is provided in the mounting hole.
  • the core 1 of the valve core is threadedly connected to the inner wall of the mounting hole.
  • a limit stopper 4 is added between the fixed portion 22 and the elastic member 3, which can form an effective limit for the elastic member 3, and the core rod 2 and the elastic member 3 are not easily separated from the core body 1.
  • the elastic member 3 will squeeze the elastic claw 42 to make the elastic claw 42 elastically deform in the radial direction of the core rod 2, so that each The free ends of the two elastic claws 42 abut against the fixed portion 22 while holding the outer wall of the core rod 2.
  • the free ends of the elastic claws 42 and the outer wall of the core rod 2 not only have an axial force, but also point to the center of the core rod 2.
  • the radial force of the axis makes it more difficult for the stopper piece 4 to be separated from the core rod 2 and realizes the reliable limit of the elastic member 3, which solves the problem that the spring and the core rod 2 are easy to appear when the nitrogen gas spring is inflated through the valve core in the related art. Departure from the core 1 problem.
  • the distance from the elastic claw 42 to the central axis of the core rod in the direction from the first end to the second end of the core rod 2 gradually increases, the limit stopper 4 is easy to install, and the elastic claw 42 is not easily deformed in the reverse direction. Turning over can form a more effective limit for the spring.
  • the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer”, etc. indicate the orientation or position The relationship is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore It cannot be understood as a restriction on this application.
  • the terms “first” and “second” are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. Among them, the terms “first end” and “second end” are two different ends.
  • the terms “installed”, “connected”, and “connected” shall be interpreted broadly, for example, it may be a fixed connection, a detachable connection, or an integral Connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • installed shall be interpreted broadly, for example, it may be a fixed connection, a detachable connection, or an integral Connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two components.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)
  • Safety Valves (AREA)

Abstract

一种气门芯及氮气弹簧，该气门芯包括芯体（1）、芯杆（2）、弹性件（3）以及限位挡片（4）；芯体（1）上设有安装通孔（10）；芯杆（2）具有沿其轴向相对设置的第一端和第二端，第一端设有固定部（22），第二端设有密封部（21），芯杆（2）设置为沿安装通孔（10）的轴向在密封位置和充放气位置之间移动；弹性件（3）夹设于安装通孔（10）内壁和限位挡片（4）之间，弹性件（3）设置为使芯杆（2）具有从充放气位置向密封位置运动的趋势；限位挡片（4）包括限位本体（41），及沿限位本体（41）周向布设的至少两个弹性卡爪（42）；弹性卡爪（42）设置为沿芯杆（2）的径向发生弹性变形以使固定部（22）穿过，并抱紧芯杆（2）的外壁使弹性卡爪（42）抵接于固定部（22）。

Description

气门芯及氮气弹簧
本申请要求在2019年10月25日提交中国专利局、申请号为201911037791.4的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及排气技术领域，例如涉及一种气门芯及氮气弹簧。
背景技术
气门芯是氮气弹簧的重要部件之一，其直接影响氮气弹簧的使用性能和安全性能。相关技术中，在通过气门芯对氮气弹簧进行充气时易出现气门芯的弹簧脱离芯杆的问题，造成安全事故。
发明内容
本申请提供一种气门芯及氮气弹簧，能够解决相关技术中在通过气门芯对氮气弹簧进行充气时易出现弹簧脱离芯杆的问题。
在一实施例中，本申请提供了一种气门芯，包括：
芯体，所述芯体上设有安装通孔；
芯杆，所述芯杆具有沿其轴向相对设置的第一端和第二端，所述第一端穿入所述安装通孔内，所述第一端设有固定部，所述第二端设有密封部；所述芯杆设置为沿所述安装通孔的轴向在密封位置和充放气位置之间移动；其中，所述芯杆处于密封位置，所述密封部与所述芯体一端密封配合使所述安装通孔的一端被封闭；所述芯杆处于充放气位置，所述密封部脱离所述芯体，使所述安装通孔的一端被打开，气体通过所述安装通孔和所述芯杆之间的缝隙流通；
弹性件，所述弹性件套设于所述芯杆外；
限位挡片，所述限位挡片包括限位本体，及沿所述限位本体周向布设的至 少两个弹性卡爪；
所述弹性件夹设于所述安装通孔内壁和所述限位挡片之间，所述弹性件设置为使所述芯杆具有从所述充放气位置向所述密封位置运动的趋势；所述弹性卡爪设置为沿所述芯杆的径向发生弹性变形以使所述固定部穿过，并抱紧所述芯杆的外壁使所述弹性卡爪抵接于所述固定部。
在一实施例中，所述第一端上设有限位卡槽，位于所述限位卡槽背离所述弹性件一侧的所述芯杆上形成所述固定部，所述弹性卡爪的自由端抵接于所述限位卡槽靠近所述固定部的侧壁。
在一实施例中，所述限位卡槽背离所述固定部的侧壁形成第一导向面，所述第一导向面沿所述第一端至所述第二端的方向到所述芯杆中心轴线的距离逐渐增大。
在一实施例中，所述弹性卡爪沿所述第一端至所述第二端的方向到所述芯杆中心轴线的距离逐渐增大。
在一实施例中，所述弹性卡爪抵接于所述固定部的一端为平面。
在一实施例中，所述固定部远离所述限位卡槽的一端设有第二导向面，所述第二导向面沿所述第一端至所述第二端的方向到所述芯杆中心轴线的距离逐渐增大。
在一实施例中，沿所述第一端至所述第二端的方向，每个弹性卡爪的周向宽度逐渐增大。
在一实施例中，所述密封部和所述芯体之间设有密封件。
在一实施例中，所述安装通孔内壁形成有第一台阶面，所述弹性件夹设于所述第一台阶面和所述限位本体之间。
在一实施例中，所述弹性卡爪与所述芯杆中心轴线之间的夹角在40°-60° 范围内；和/或，
所述限位本体与所述芯杆中心轴线之间的夹角在80°-100°范围内。
在一实施例中，还提供了一种氮气弹簧，包括上述任一实施例所述的气门芯，所述氮气弹簧上设有与所述氮气弹簧的内腔连通的安装孔，所述气门芯设于所述安装孔内。
附图说明
图1是相关技术提供的气门芯的结构示意图；
图2是本申请实施例提供的气门芯的剖视图；
图3是本申请实施例提供的芯杆的结构示意图；
图4是本申请实施例提供的限位挡片与芯杆配合的结构示意图；
图5是本申请实施例提供的气门芯的充气状态图；
图6是本申请实施例提供的气门芯的密封状态图。
图中：
1、芯体；10、安装通孔；11、第一孔；12、第二孔；13、第三孔；
2、芯杆；21、密封部；22、固定部；23、限位卡槽；24、第一导向面；25、第二导向面；
3、弹性件；
4、限位挡片；41、限位本体；42、弹性卡爪；
5、密封件；
10′、芯体；20′、芯杆；30′、弹簧。
具体实施方式
下面结合附图并通过具体实施方式来进一步说明本申请的技术方案。可以 理解的是，此处所描述的具体实施例仅仅用于解释本申请，而非对本申请的限定。为了便于描述，附图中仅示出了与本申请相关的部分而非全部。
如图1所示，相关技术中的气门芯包括芯体10′、芯杆20′及弹簧30′，芯体10′套设于芯杆20′外，弹簧30′套设于芯杆20′外，芯杆20′的轴向一端形成有限位台阶面，为了保证弹簧能够顺利安装且不发生塑性变形，限位台阶面宽度尺寸控制在一定的范围内，弹簧30′具有大径端和小径端，装配气门芯时，弹簧30′的大径端从芯杆20′设有限位台阶面一端套设于芯杆20′上，沿弹簧30′的轴向向芯杆20′的远离限位台阶面的一端挤压弹簧30′的小径端，弹簧30′的小径端将会逐渐发生变形以使其外径增大，进而使弹簧30′整个套设于芯杆20′上，并通过限位台阶面对弹簧30′的小径端进行限位。
在对氮气弹簧的缸体进行充气时，在高压气体的作用下弹簧30′将会被压缩，以使芯杆20′克服弹簧力的作用向图1中下方移动，芯杆20′一端的密封部脱离芯体10′，气体通过芯体10′和密封部与芯杆20′之间的缝隙。在该过程中弹簧30′及芯杆20′极易发生偏斜，导致弹簧30′的小径端发生变形，此时极易导致限位台阶面的限位作用失效而使弹簧30′脱离芯杆20′，进一步导致芯杆20′及弹簧30′脱离芯体10′造成安全事故。如图2所示，本实施例提供了一种气门芯，可以应用于氮气弹簧，下面以应用于氮气弹簧的气门芯为例，对气门芯的具体结构进行详细介绍。
上述气门芯包括芯体1、芯杆2、弹性件3和限位挡片4，其中芯体1上设有安装通孔10，安装通孔10包括沿其轴向依次设置且孔径依次增大的第一孔11、第二孔12和第三孔13。
芯杆2具有沿其轴向相对设置的第一端和第二端，芯杆2的第二端设有密封部21，在一实施例中，密封部21可以为圆盘状，密封部21的外径大于第一 孔11的外径，芯杆2设置为沿安装通孔10的轴向在密封位置和充放气位置之间移动。其中，芯杆2处于密封位置，密封部21与芯体1一端密封配合使安装通孔10的一端被封闭。
在一实施例中，第一端经由第一孔11穿入安装通孔10内，使密封部21能够抵接于第一孔11的端面，以实现密封部21与芯体1端部之间的密封，从而使安装通孔10的一端被封闭。在一实施例中，上述密封部21与芯杆2一体成型，也可以采用其他连接方式，如螺纹连接、焊接、卡接等方式将密封部21连接于芯杆2的第二端。
为了提高密封部21与芯体1端部之间的密封效果，本实施例在密封部21和芯体1之间设置密封件5。在一实施例中，上述密封件5为密封圈。在一实施例中，芯体1连接于芯杆2的第二端的外壁呈阶梯状，包括沿芯杆2的第二端至芯杆2的第一端的方向依次设置且外径依次增大的第一阶梯柱、第二阶梯柱和第三阶梯柱。密封件5内设有阶梯孔，密封件5套设于芯体1外，使阶梯孔内形成的第一阶梯面抵接于第一阶梯柱和第二阶梯柱形成的第二阶梯面，并使阶梯孔的大径孔内壁抵接于第二阶梯柱的外壁。可以通过压装的方式将上述密封件5安装于芯体1上，并实现对密封件5的定位保证密封性。
本申请的其他实施例中，由于密封部21的外径大于第一孔11的外径且大于密封件5靠近密封部21一端的内径，因此也可以在密封部21朝向芯体1的端面设置密封件5，通过轴向移动芯杆2使密封件5夹设于芯体1和密封部21之间。也可以将第一孔11的开口端设置为渐扩锥形孔，并使上述密封部21的外表面设置为锥面，该锥面与上述渐扩锥形孔配合实现第一孔11和密封部21之间的密封。在一实施例中，也可以直接在芯体1朝向密封部21的端面直接设置密封件5，通过轴向移动芯杆2使密封件5夹设于芯体1和密封部21之间。
芯杆2处于充放气位置，密封部21脱离芯体1，使第一孔被打开，气体通过安装通孔10和芯杆2之间的缝隙流通。在一实施例中，第一孔11的孔径大于穿设于第一孔11内的芯杆2外径，以使气体能够通过芯杆2和安装通孔10之间的缝隙流通。
上述弹性件3套设于芯杆2外，且设置为使芯杆2具有从充放气位置向密封位置运动的趋势。在一实施例中，上述弹性件3为弹簧。芯杆2的第一端设有固定部22，限位挡片4设于固定部22和弹性件3之间，通过限位挡片4对弹性件3进行限位，防止弹性件3脱离芯杆2。由于限位挡片4的作用，本实施例中的弹簧可以采用常规弹簧，无需采用具有大径端和小径端的弹簧，限位挡片4可以设置较大的外径尺寸对弹簧形成更有效的限位，避免了芯杆2脱离芯体。本实施例中，固定部22与芯杆2一体成型，也可以采用其他连接方式，如螺纹连接、焊接、卡接等方式将固定部22连接于芯杆2的第一端。
如图2和图3所示，本实施例中，芯杆2的第一端设有限位卡槽23，位于限位卡槽23背离弹性件3一侧的芯杆2形成固定部22。在一实施例中，上述限位卡槽23为环形槽。
在一实施例中，如图2和图4所示，限位挡片4包括限位本体41及沿限位本体41周向间隔布设的至少两个弹性卡爪42。上述第一孔11和第二孔12之间形成第一台阶面，弹性件3的一端抵接于第一台阶面，另一端抵接于限位本体41背离弹性卡爪42的一侧；弹性卡爪42能够沿芯杆2的径向发生弹性变形以使固定部22穿过，并抱紧芯杆2外壁使弹性卡爪42抵接于固定部22。通过第一台阶面和限位本体41对弹性件3进行限位，避免弹性件3直接接触弹性卡爪42而使弹性卡爪42沿芯杆2径向向外扩张从而导致限位挡片4的限位功能变差的问题发生。
在一实施例中，上述限位本体41可以是环状结构或其他能够穿设在芯杆2外的结构。
本实施例中，弹性卡爪42沿第一端至第二端的方向到芯杆2中心轴线的距离逐渐增大。弹性卡爪42与芯杆2中心轴线之间的夹角在40°-60°范围内，和/或，限位本体41与芯杆2中心轴线之间的夹角在80°-100°范围内。
在安装上述限位挡片4时，将限位本体41套设在固定部22上，施加由芯杆2的第一端指向芯杆2的第二端的外力，使限位挡片4沿芯杆2轴向移动，弹性卡爪42将在固定部22的作用下发生径向扩张，在限位挡片4进入限位卡槽23内后，弹性卡爪42的部分弹性形变消失，弹性卡爪42将会在剩余弹性形变的作用下抱紧限位卡槽23所在的芯杆2外壁；限位挡片4安装过程变形比较便易，安装过程阻力较平面形式的限位挡片减少了60％以上；而之后弹性件3将会挤压限位挡片4，使弹性卡爪42进一步抱紧芯杆2外壁，弹性卡爪42的自由端与芯杆2外壁之间不仅具有轴向力，还具有指向芯杆2中心轴线的径向力，同时弹性卡爪42的自由端将抵接于限位卡槽23靠近固定部22的侧壁，使限位挡片4难以脱离芯杆2；限位挡片4安装至芯杆2之后，弹性件3时弹性卡爪具有与安装过程中完全相反的变形方向，因此，弹性卡爪42不易反向变形、外翻、脱离芯杆2，能够对弹簧3形成更有效的限位，较相关技术中的气门芯的芯杆2脱离率降低了90％以上；有效地避免了弹性件3发生径向收缩、偏斜等现象，同时能够有效避免弹性件3直接作用于弹性卡爪42而使得弹性卡爪42向外扩张。
本实施例提供的限位挡片4不仅具有对弹性件3的限位作用，还具有结构简单、易于安装有点；而且在弹性件3挤压限位挡片4时，弹性卡爪42不易反向变形、外翻，且弹性卡爪42抱紧芯杆2外壁，使弹性件3难以脱离芯杆2。
在一实施例中，本申请可以通过对弹性卡爪42的结构设置，使限位挡片4 进入限位卡槽23后，弹性卡爪42的弹性形变完全消失，而后利用弹性件挤压3挤压限位挡片4，使弹性卡爪42发生弹性变形而抱紧限位卡槽23所在的芯杆2外壁，同时使弹性卡爪42的自由端将抵接于限位卡槽23靠近固定部22的侧壁。
在一实施例中，限位本体41与芯杆2中心轴线之间的夹角为90°，提高限位挡片4的辖内效果。
如图2和图5所示，在充气过程中，在高压气体压力作用下，弹性件3被压缩，芯杆2将沿其轴向由密封位置向充放气位置移动，使密封部21脱离芯体1，安装通孔10的一端被打开，使气体能够通过安装通孔10和芯杆2之间的缝隙充入到氮气弹簧的缸体内部。在芯杆2沿其轴向由密封位置向充放气位置移动的过程中，弹性件3被压缩将挤压限位挡片4，使每个弹性卡爪42的自由端抵接于固定部22的同时进一步抱紧芯杆2外壁，弹性卡爪42的自由端与芯杆2外壁之间不仅具有轴向力，还具有指向芯杆2中心轴线的径向力，使限位挡片4更加不易脱离芯杆2，实现对弹性件3的可靠限位。
在一实施例中，上述弹性卡爪42设有三个，三个弹性卡爪42沿限位本体41的周向均匀分布，在保证整个弹性卡爪42受力均匀，简化限位挡片4的结构，降低加工难度。同时由于三个弹性卡爪42之间间隔分布，在充放气时，气体能够通过相邻两个弹性卡爪42之间的缝隙穿过限位挡片4。当然本申请的其他实施例中，上述弹性卡爪42还可以设置四个、五个或更多个。
在一实施例中，如图2所示，第二孔12和第三孔13之间形成第二台阶面，第二孔12的孔径小于限位本体41的外径，通过第二台阶面对限位本体41进行限位，以对弹性卡爪42进行保护，防止弹性卡爪42发生永久形变而失效。
为了便于将限位挡片4安装于芯杆2上，在一实施例中，在限位卡槽23背离固定部22的侧壁形成第一导向面24，第一导向面24沿第一端至第二端的方 向到芯杆2中心轴线的距离逐渐增大。上述第一导向面24不仅具有导向作用，而且能够有效避免弹性卡爪42内侧壁直接与棱角碰撞而损伤弹性卡爪42。在一实施例中，上述第一导向面24为圆锥面。在一实施例中，圆锥面的母线与芯杆2中心轴线之间的夹角在40°-60°范围内。
在一实施例中，第一导向面24与芯杆2中心轴线之间的夹角大于或等于弹性卡爪42与芯杆2中心轴线之间的最小夹角，确保第一导向面24能够对弹性卡爪42的弹性变形起到导向作用。在一实施例中，弹性卡爪42与芯杆2中心轴线之间的最小夹角等于第一导向面24与芯杆2中心轴线之间的夹角。
在一实施例中，弹性卡爪42抵接于固定部22的一端为平面，增大弹性卡爪42的自由端与固定部22之间的接触面积，提高固定部22对弹性卡爪42进行限位的牢固程度。
在一实施例中，固定部22的远离限位卡槽23的一端设有第二导向面25，第二导向面25沿芯杆2的第一端至芯杆2的第二端的方向到芯杆2中心轴线的距离逐渐增大。其中，第二导向面25与芯杆2中心轴线之间的夹角大于或等于弹性卡爪42与芯杆2中心轴线之间的最小夹角。在一实施例中，第二导向面25与芯杆2中心轴线之间的夹角等于弹性卡爪42与芯杆2中心轴线之间的最小夹角。本实施例中，上述第二导向面25与芯杆2中心轴线之间的夹角在40°-60°范围内。
通过上述设置，在安装限位挡片4时，限位挡片4在外力作用下沿芯杆2轴向由芯杆2的第一端向第二端运动，弹性卡爪42的内侧壁能够与第二导向面25相互抵接，而逐渐发生形变，第二导向面25对弹性卡爪42的安装起到了导向作用，同时避免弹性卡爪42与尖棱发生碰撞，起到保护限位挡片4的作用，避免限位挡片4被损坏。
在一实施例中，沿芯杆2的第一端至第二端的方向，每个弹性卡爪42的周向宽度逐渐增大。通过上述设置，实现在保证弹性卡爪42与限位本体41连接强度的基础上，减小弹性卡爪42发生弹性变形的力。
在一实施例中，每个弹性卡爪42与限位卡槽23靠近固定部22侧壁接触区域沿芯杆2径向的最大宽度为限位卡槽23的径向深度H，H可以取值为0.08mm-0.12mm。
采用本实施例提供的气门芯进行充气的过程如下：芯杆2在外界高压气体的推动作用下沿第一端指向第二端的方向运动(图5所示箭头方向)，由于弹性件3抵接于第一台阶面，弹性件3将逐渐被压缩，同时弹性件3将会作用于限位挡片4，使弹性卡爪42进一步抱紧限位卡槽23所在芯杆2外壁，且使弹性卡爪42的自由端抵接于限位卡槽23靠近固定部22的侧壁。如图2和图5所示，密封部21逐渐脱离密封件5，第一开孔11的一段被打开，高压气体将会通过芯杆2与第一孔11之间的缝隙、密封部21与密封件5之间的缝隙进入氮气弹簧的缸体内。
在充气完毕后，由于氮气弹簧的缸体内的压强大于外界大气压，氮气弹簧的缸体内高压气体将会推动密封部21使芯杆2沿第二端指向第一端的方向移动(如图6箭头所示)，如图2和图6所示，在密封部21抵接于密封件5时，密封件5将会使密封部21和芯体1的端部之间形成有效密封，使氮气弹簧的缸体内的高压气体无法通过芯杆2与第一孔11之间的缝隙排出。
在对氮气弹簧的缸体进行放气时，使用外部顶针推动芯杆2沿第一端指向第二端的方向运动，使密封部21脱离密封件5，第一开孔11的一端被打开，氮气弹簧的缸体内的高压气体将会通过密封部21与密封件5之间的缝隙、芯杆2与第一孔11之间的缝隙排出。
本实施例还提供了一种氮气弹簧，包括上述的气门芯，氮气弹簧上设有与氮气弹簧的内腔连通的安装孔，上述气门芯设于安装孔内。在一实施例中，气门芯的芯体1与安装孔内壁螺纹连接。
在充气时高压气体通过上述气门芯送入氮气弹簧的内腔，在放气时通过上述气门芯使氮气弹簧的内腔与外界大气连通，在常规状态下通过上述气门芯使氮气弹簧的内腔与外界大气断开以对氮气弹簧进行密封。
本申请在固定部22和弹性件3之间增设了限位挡片4，能够对弹性件3形成有效的限位，芯杆2及弹性件3不易脱离芯体1。在芯杆2沿其轴向由密封位置向充放气位置移动的充气过程中，弹性件3将挤压弹性卡爪42使弹性卡爪42沿芯杆2的径向发生弹性变形，使每个弹性卡爪42的自由端抵接于固定部22的同时抱紧芯杆2外壁，弹性卡爪42的自由端与芯杆2外壁之间不仅具有轴向力，还具有指向芯杆2中心轴线的径向力，使限位挡片4更加难以脱离芯杆2，实现对弹性件3的可靠限位，解决了相关技术中通过气门芯对氮气弹簧进行充气时易出现弹簧及芯杆2脱离芯体1的问题。
而且，弹性卡爪42沿芯杆2的第一端至第二端的方向到芯杆中心轴线的距离逐渐增大，限位挡片4安装便易，且弹性卡爪42不易反向变形、外翻，能够对弹簧形成更有效的限位。
在本申请的描述中，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、仅用于描述目的，而不能理解为指示或暗示相对重要性。其中，术语“第一端”和“第二端”为两个不同的端。
在本申请的描述中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。

Claims (11)

  1. 一种气门芯，包括：
    芯体(1)，所述芯体(1)上设有安装通孔(10)；
    芯杆(2)，所述芯杆(2)具有沿其轴向相对设置的第一端和第二端，所述第一端穿入所述安装通孔(10)内，所述第一端设有固定部(22)，所述第二端设有密封部(21)；所述芯杆(2)设置为沿所述安装通孔(10)的轴向在密封位置和充放气位置之间移动；其中，所述芯杆(2)处于密封位置，所述密封部(21)与所述芯体(1)一端密封配合使所述安装通孔(10)的一端被封闭；所述芯杆(2)处于充放气位置，所述密封部(21)脱离所述芯体(1)使所述安装通孔(10)的一端被打开，气体通过所述安装通孔(10)和所述芯杆(2)之间的缝隙流通；
    弹性件(3)，所述弹性件(3)套设于所述芯杆(2)外；
    限位挡片(4)，所述限位挡片(4)包括限位本体(41)及沿所述限位本体(41)周向布设的至少两个弹性卡爪(42)；
    所述弹性件(3)夹设于所述安装通孔(10)内壁和所述限位挡片(4)之间，所述弹性件(3)设置为使所述芯杆(2)具有从所述充放气位置向所述密封位置运动的趋势；所述弹性卡爪(42)设置为沿所述芯杆(2)的径向发生弹性变形以使所述固定部(22)穿过，并抱紧所述芯杆(2)的外壁使所述弹性卡爪(42)抵接于所述固定部(22)。
  2. 根据权利要求1所述的气门芯，其中，所述第一端上设有限位卡槽(23)，位于所述限位卡槽(23)背离所述弹性件(3)一侧的所述芯杆上(2)形成所述固定部(22)，所述弹性卡爪(42)的自由端抵接于所述限位卡槽(23)靠近所述固定部(22)的侧壁。
  3. 根据权利要求2所述的气门芯，其中，所述限位卡槽(23)背离所述固 定部(22)的侧壁形成第一导向面(24)，所述第一导向面(24)沿所述第一端至所述第二端的方向到所述芯杆(2)中心轴线的距离逐渐增大。
  4. 根据权利要求3所述的气门芯，其中，所述弹性卡爪(42)沿所述第一端至所述第二端的方向到所述芯杆(2)中心轴线的距离逐渐增大。
  5. 根据权利要求2所述的气门芯，其中，所述弹性卡爪(42)抵接于所述固定部(22)的一端为平面。
  6. 根据权利要求2所述的气门芯，其中，所述固定部(22)远离所述限位卡槽(23)的一端设有第二导向面(25)，所述第二导向面(25)沿所述第一端至所述第二端的方向到所述芯杆(2)中心轴线的距离逐渐增大。
  7. 根据权利要求1至6任一项所述的气门芯，其中，沿所述第一端至所述第二端的方向，每个弹性卡爪(42)的周向宽度逐渐增大。
  8. 根据权利要求1至6任一项所述的气门芯，其中，所述密封部(21)和所述芯体(1)之间设有密封件(5)。
  9. 根据权利要求1至6任一项所述的气门芯，其中，所述安装通孔(10)内壁形成有第一台阶面，所述弹性件(3)夹设于所述第一台阶面和所述限位本体(41)之间。
  10. 根据权利要求1至6任一项所述的气门芯，还包括下述至少一项：
    所述弹性卡爪(42)与所述芯杆(2)中心轴线之间的夹角在40°-60°范围内；所述限位本体(41)与所述芯杆(2)中心轴线之间的夹角在80°-100°范围内。
  11. 一种氮气弹簧，包括权利要求1至10任一项所述的气门芯，所述氮气弹簧上设有与所述氮气弹簧的内腔连通的安装孔，所述气门芯设于所述安装孔内。
PCT/CN2020/070084 2019-10-25 2020-01-02 气门芯及氮气弹簧 WO2021077626A1 (zh)

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