Expansion valve core and locking type light inflating valve applied by expansion valve core

Abstract

The invention relates to an expansion valve element which structurally comprises a core rod, a reducing sealing sleeve and a positioning clamping sleeve. The lower half part of the core rod is conical, the upper half part is cylindrical, and the top end of the core rod is provided with a cross-shaped groove; the reducing sealing sleeve is made of a plastic material, wraps the lower half part and the bottom surface of the core rod, and is in sealing fit with the inner circumferential surface of a matched inflating valve air rod; the upper end of the reducing sealing sleeve is connected with a positioning clamping sleeve. The expansion valve element is matched with the conical face of the air rod after being supported and expanded by the core rod, and therefore the sealing effect is achieved. The locking type light inflating valve with the expansion valve element comprises an air rod, an air cap and the expansion valve element. A conical surface arranged in an inner cavity of the air rod is in compression sealing fit with a variable-diameter sealing sleeve of the expansion valve core; internal threads at the lower end of the hood are connected and matched with external threads at the upper end of the air rod; and an elastic locking piece is arranged in an inner cavity of the hood and is in tensioning fit with the core rod. According to the locking type light inflating valve applying the expansion valve element, the core rod always has upward pulling force, and the sealing performance of the inflating valve is further enhanced.

Description

Technical Field

[0001] This invention relates to an expansion valve core and its application in a locking lightweight valve stem, belonging to the technical field of tire valve stems. Background Technology

[0002] The valve stem on a tire is a crucial component for inflating and deflating the tire and for sealing it. Slow tire leakage is often caused by the valve stem because its split structure inevitably creates sealing points, which cannot be perfectly sealed. Therefore, slow leakage is a common phenomenon; valves with better sealing will leak more slowly. Comparing the current mainstream American and French valve stem structures, both have two sealing points. The French valve stem adds a manual locking device to the valve core sealing point, resulting in better airtightness than the American valve stem, which lacks this device. Therefore, reducing the number of sealing points on the valve stem and tightening those points effectively improves valve stem performance. Furthermore, both American and French valve stems have a characteristic that negatively impacts airtightness: the valve cores of both types are threaded together with the valve stem from the outside in, creating a seal. This inward pressure is opposite to the air pressure inside the tire. To reduce material deformation under this opposing force and ensure a tighter seal, the valve core and valve stem must be made of high-rigidity metal to minimize deformation. However, the high density of metal materials also hinders the lightweight design of the entire valve stem. Additionally, the valve cap may occasionally detach during use. Without the dust protection of the cap, subsequent inflation sealing will also be negatively affected. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an expansion valve core and a locking lightweight valve stem thereof. The expansion valve core is expanded by being supported by a core rod and then engages with the conical surface of the valve stem to achieve a sealing effect. The locking lightweight valve stem using the expansion valve core ensures that the core rod always has an upward pulling force, further enhancing the sealing performance of the valve stem.

[0004] To solve the above problems, the specific technical solution of the present invention is as follows: an expansion valve core, comprising a core rod, a variable diameter sealing sleeve, and a positioning sleeve; the core rod has a conical structure in its lower half and a cylindrical structure in its upper half, with a cross groove at the top; the variable diameter sealing sleeve is made of plastic and wraps around the lower half and bottom surface of the core rod, the outer surface of the variable diameter sealing sleeve is a conical surface, and it seals with the inner circumferential surface of the valve stem; the upper end of the variable diameter sealing sleeve is connected to the positioning sleeve, which is positioned and engaged with the inner surface of the valve stem.

[0005] The inner surface of the variable diameter sealing sleeve is provided with a conical spring; a spiral groove that mates with the conical spring is provided on the conical surface of the core rod.

[0006] When the reducing seal sleeve completely covers the lower half of the core rod, the outer periphery of the reducing seal sleeve deforms and expands; when the lower half of the core rod pushes the bottom surface of the reducing seal sleeve downward, the outer periphery of the reducing seal sleeve shrinks back.

[0007] The upper half of the positioning sleeve is provided with an external thread, and the lower half is provided with a spiral groove. The spiral groove is engaged with the inner circumference of the upper section of the conical spring. A clamping nut is connected to the external thread of the positioning sleeve. The lower end of the clamping nut is closed and clamped with the corresponding outer circumference of the variable diameter sealing sleeve. Two to four circumferentially distributed positioning plates are provided at the upper end of the positioning sleeve. The positioning plates are inserted and positioned on the inner circumference of the valve stem.

[0008] A locking lightweight valve with an expansion valve core includes a valve stem, a blower cap, and an expansion valve core. The conical surface inside the valve stem is pressed and sealed with the variable diameter sealing sleeve of the expansion valve core. The internal thread at the lower end of the blower cap is connected to the external thread at the upper end of the valve stem. An elastic locking element is provided inside the blower cap, and the locking rod connected to the elastic locking element is tightened with the valve core.

[0009] The elastic locking component includes a locking rod, a return spring, and a gear; an annular tooth is provided on the upper side wall of the inner cavity of the wind cap, and the gear engages with the annular tooth; a support ring is provided in the middle of the inner cavity of the wind cap, one end of the return spring is supported on the upper surface of the support ring, and the other end is supported on the lower surface of the gear; a locking rod is fixedly connected to the center of the lower surface of the gear, and the lower end of the locking rod is provided with an internal thread; an external thread is provided on the top of the core rod, and the internal thread at the lower end of the locking rod is connected to the external thread of the core rod.

[0010] The pitch of the internal thread at the lower end of the wind cap is 0.01 to 0.5 mm less than the pitch of the internal thread of the locking rod.

[0011] The expansion valve core of this application and its application in the locking lightweight valve stem, employing the above-described structure, have the following advantages: 1. The expansion valve core has a variable diameter function, which can be installed into the internal pressure vessel or valve body when it is in the contracted state, and achieve a conical surface seal in the same direction as the internal pressure after expansion; 2. The locking lightweight valve stem uses an expansion valve core, which, compared to the threaded valve cores used in current American and French valve stems, applies pressure in the same direction to the sealing point and reduces the number of sealing points, thus improving sealing performance. 3. The locking lightweight valve adopts an elastic locking structure. The elastic connection between the air cap and the expansion valve core can effectively prevent the air cap from loosening. Furthermore, by utilizing the pitch difference between the air cap and the locking rod, the simultaneous completion of tightening the air cap for dust prevention and locking the expansion valve core for sealing is achieved. 4. The sealing layer is sealed under pressure in the same direction and is less affected by deformation. Therefore, there are more choices for the valve material, which is beneficial to the product's lightweight design and cost control. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the expansion valve core.

[0013] Figure 2 This is a schematic diagram of the expansion valve core in its contracted state.

[0014] Figure 3 This is a schematic diagram of a locking lightweight valve stem with an expansion valve core.

[0015] Figure 4 This is a schematic diagram of the inflation state of a locking lightweight valve. Detailed Implementation

[0016] like Figure 1 As shown, an expansion valve core includes a core rod 1, a variable diameter sealing sleeve 2, and a positioning sleeve 3. The core rod 1 has a conical lower half and a cylindrical upper half with a cross-shaped groove at the top. The variable diameter sealing sleeve 2 is made of plastic and wraps around the lower half and bottom surface of the core rod 1. The outer surface of the variable diameter sealing sleeve 2 is conical and seals with the inner circumferential surface of the valve stem. The upper end of the variable diameter sealing sleeve 2 is connected to the positioning sleeve 3, which is positioned and engaged with the inner surface of the valve stem.

[0017] The inner surface of the variable diameter sealing sleeve 2 is provided with a conical spring 4, which is either separate from or integrally formed with the variable diameter sealing sleeve 2. A spiral groove that mates with the conical spring 4 is provided on the conical surface of the core rod 1. When the variable diameter sealing sleeve 2 completely covers the lower half of the core rod 1, the outer periphery of the variable diameter sealing sleeve 2 deforms and expands; when the lower half of the core rod 1 pushes down to open the bottom surface of the variable diameter sealing sleeve 2, the outer periphery of the variable diameter sealing sleeve 2 shrinks back, such as... Figure 2 As shown.

[0018] The upper half of the positioning sleeve 3 has an external thread, and the lower half has a spiral groove, which mates with the inner circumference of the upper section of the conical spring 4. A clamping nut 5 is connected to the external thread of the positioning sleeve 3. The lower end of the clamping nut 5 is tapered and clamps with the corresponding outer circumference of the variable diameter sealing sleeve 2. Two to four circumferentially distributed positioning plates 6 are provided at the upper end of the positioning sleeve 3. The positioning plates 6 are inserted and positioned on the inner circumference of the valve stem. By inserting the positioning plates 6 into the stem, the variable diameter sealing sleeve 2 does not rotate during deformation.

[0019] like Figure 3As shown, a locking lightweight valve with an expansion valve core includes a valve stem 11, a cap 12, and an expansion valve core. A conical surface within the valve stem 11 presses against the variable-diameter sealing sleeve 2 of the expansion valve core for a tight seal. The lower internal thread of the cap 12 connects with the upper external thread of the valve stem 11. An elastic locking element is provided within the cap 12, and a locking rod 16 connected to the elastic locking element is tightened against the core rod 1. The pitch of the lower internal thread of the cap 12 is 0.01–0.5 mm less than the pitch of the locking rod 16's internal thread. The screw depth of the cap 12 and the valve stem is less than the helical engagement length of the locking rod 16 and the top of the core rod 1. The locking rod 16 maintains a continuous tension on the core rod 1 through spring force, ensuring the tight seal of the variable-diameter sealing sleeve 2.

[0020] The elastic locking component includes a locking rod 16, a return spring 15, and a gear 14; an annular tooth 13 is provided on the upper side wall of the inner cavity of the wind cap 12, and the gear 14 cooperates with the annular tooth 13; a support ring 17 is provided in the middle of the inner cavity of the wind cap 12, one end of the return spring 15 is supported on the upper surface of the support ring 17, and the other end is supported on the lower surface of the gear 14; the locking rod 16 is fixedly connected to the center of the lower surface of the gear 14, and the lower end of the locking rod 16 is provided with an internal thread; an external thread is provided on the top of the core rod 1, and the internal thread at the lower end of the locking rod 16 is connected to the external thread of the core rod 1.

[0021] The working process of a locking lightweight valve stem containing an expansion valve core is as follows: 1. Installation and inflation process: such as Figure 4 As shown, the air cap 12 is in the disassembled state. The expansion valve core enters from the upper end of the air rod 11 and the positioning insert 6 is inserted into the slot. Then, the core rod 1 is rotated through the top cross groove to engage with the variable diameter sealing sleeve 2, and then the air nozzle can be inflated.

[0022] 2. Pressure Holding Process: After inflation is complete, the high pressure inside the tire pushes the core rod 1 upwards, causing the outer circumference of the variable diameter sealing sleeve 2 to completely fit against the conical inner wall of the air rod 11, achieving a seal. Simultaneously, the inner thread of the outer circumference of the vent cap 12 connects to the air rod 11, and the inner thread of the locking rod 16 engages with the outer thread at the top of the core rod 1. As the vent cap 12 continuously rotates downwards, the gear 14 and the ring gear 13 rotate continuously, but this does not affect the axial movement of the locking rod 16. Simultaneously, the elastic force of the return spring 15 maintains an upward pulling force on the locking rod 16. Because the pitch of the inner thread at the lower end of the vent cap 12 is smaller than the pitch of the inner thread of the locking rod 16, the rotation speed of the locking rod 16 is high, further lifting the core rod 1 and ensuring the sealing performance of the variable diameter sealing sleeve 2.

[0023] 3. Disassembly process: When it is necessary to disassemble the core rod, insert an external tool into the cross groove at the top of the core rod 1 and rotate it continuously, as shown. Figure 2As shown, when the core rod 1 moves downward, the conical spring 4 inside the variable diameter sealing sleeve 2 moves upward along the spiral groove of the core rod 1, thereby making the variable diameter sealing sleeve 2 longer and narrower. The core rod 1 and the variable diameter sealing sleeve 2 can be pulled out from the conical hole of the air rod 11 by external force.

Claims

1. An expansion valve core, characterized in that: It includes a core rod (1), a variable diameter sealing sleeve (2), and a positioning sleeve (3); the core rod (1) has a conical structure in the lower half and a cylindrical structure in the upper half, with a cross groove at the top; the variable diameter sealing sleeve (2) is made of plastic and wraps around the lower half and bottom surface of the core rod (1), the outer surface of the variable diameter sealing sleeve (2) is a conical surface, and it seals with the inner circumferential surface of the valve stem; the upper end of the variable diameter sealing sleeve (2) is connected to the positioning sleeve (3), and the positioning sleeve (3) is positioned and engaged with the inner surface of the valve stem.

2. The expansion valve core according to claim 1, characterized in that: The inner surface of the variable diameter sealing sleeve (2) is provided with a conical spring (4); a spiral groove that cooperates with the conical spring (4) is provided on the conical surface of the core rod (1).

3. The expansion valve core according to claim 2, characterized in that: When the variable diameter sealing sleeve (2) completely covers the lower half of the core rod (1), the outer periphery of the variable diameter sealing sleeve (2) deforms and expands; when the lower half of the core rod (1) pushes the bottom surface of the variable diameter sealing sleeve (2) downward, the outer periphery of the variable diameter sealing sleeve (2) shrinks back and becomes smaller.

4. The expansion valve core according to claim 2, characterized in that: The upper half of the positioning sleeve (3) is provided with an external thread, and the lower half is provided with a spiral groove. The spiral groove is engaged with the inner circumference of the upper section of the conical spring (4). A clamping nut (5) is connected to the external thread of the positioning sleeve (3). The lower end of the clamping nut (5) is closed and clamped with the corresponding outer circumference of the variable diameter sealing sleeve (2). Two to four circumferentially distributed positioning inserts (6) are provided at the upper end of the positioning sleeve (3). The positioning inserts (6) are inserted and positioned on the inner circumference of the valve stem.

5. A locking lightweight valve stem comprising the expansion valve core of claim 4, characterized in that: It includes a gas rod (11), a wind cap (12) and an expansion valve core; the conical surface in the inner cavity of the gas rod (11) is pressed and sealed with the variable diameter sealing sleeve (2) of the expansion valve core; the internal thread at the lower end of the wind cap (12) is connected to the external thread at the upper end of the gas rod (11); an elastic locking element is provided in the inner cavity of the wind cap (12), and the locking rod (16) connected to the elastic locking element is tightened with the core rod (1).

6. The locking lightweight valve stem according to claim 5, characterized in that: The elastic locking component includes a locking rod (16), a return spring (15), and a gear (14); a ring tooth (13) is provided on the upper side wall of the inner cavity of the wind cap (12), and the gear (14) cooperates with the ring tooth (13); a support ring (17) is provided in the middle of the inner cavity of the wind cap (12), one end of the return spring (15) is supported on the upper surface of the support ring (17), and the other end is supported on the lower surface of the gear (14); the locking rod (16) is fixedly connected to the center of the lower surface of the gear (14), and the lower end of the locking rod (16) is provided with an internal thread; an external thread is provided on the top of the core rod (1), and the internal thread at the lower end of the locking rod (16) is connected to the external thread of the core rod (1).

7. The locking lightweight valve stem according to claim 6, characterized in that: The pitch of the internal thread at the lower end of the wind cap (12) is 0.01 to 0.5 mm less than the pitch of the internal thread of the locking rod (16).

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