A valve core with tire pressure indication and its assembly method

Abstract

The present invention discloses a valve core with tire pressure indication and its assembly method, which includes a positioning sleeve. A core rod is inserted through the positioning sleeve, and a return spring is arranged between the positioning sleeve and the core rod. A seal is arranged on the core rod to block the positioning sleeve. A hollow channel is arranged inside the core rod, and a piston is arranged inside the hollow channel. A magnet is arranged on the piston. One end of the core rod close to the seal is provided with an elastic airbag communicated with the hollow channel, and the other end of the core rod is blocked by a plug head with screw fit. A movable ring is sleeved outside the core rod, and an iron block is arranged on the movable ring. A first conductive ring is arranged on the movable ring, and a second conductive ring and a third conductive ring are fixedly arranged outside the core rod. The movable ring is arranged between the second conductive ring and the third conductive ring, and a projection assembly is arranged outside the positioning sleeve. This valve core can project an indication projection on the wall or the ground when the tire pressure is too high or too low, and this assembly method can conveniently control the initial gas volume in the elastic airbag on the core rod.

Description

Technical Field

[0001] The present invention belongs to the technical field of valve cores, and particularly relates to a valve core with tire pressure indication and an assembly method thereof, and more particularly to a valve core capable of projecting a projection indicating too high or too low tire pressure and an assembly method thereof. Background Art

[0002] A valve core is a one-way valve installed on a tire to prevent air leakage. Existing valve cores generally include a positioning sleeve, a core body is arranged inside the positioning sleeve, an air hole is arranged in the center of the core body, a core rod is inserted through the air hole, and a return spring is arranged between the core rod and the core body. Under the elastic force of the return spring, the end of the core rod blocks the air hole to achieve the function of one-way sealing.

[0003] During driving, too high or too low tire pressure will pose safety hazards and reduce driving safety. With the development of technology, more and more cars are equipped with tire pressure detection functions. The pressure inside the tire is detected by a tire pressure detection sensor, and the tire pressure can be directly displayed on the central control panel in the car cab. However, for some motorcycles, electric vehicles, and bicycles, the tire pressure detection function is far from being so perfect. Moreover, for these vehicle models, equipping with tire pressure detection undoubtedly greatly increases the manufacturing cost and the use cost of the vehicle. And for those vehicle models that are already in use and originally not equipped with a tire pressure detection function, the cost of retrofitting the tire pressure detection function is even higher. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a valve core with tire pressure indication and an assembly method thereof. This valve core can have the function of detecting too high or too low tire pressure only by replacing the valve core, and can project an indication projection on the wall or the ground when the tire pressure is too high or too low, greatly reducing the cost of retrofitting the function of warning of too high or too low tire pressure for vehicle models that originally do not have a tire pressure detection function. This assembly method can conveniently assemble the core rod and the entire valve core, can conveniently control the initial gas volume in the elastic airbag on the core rod, and improves the assembly efficiency.

[0005] To solve the above technical problems, the present invention is solved by the following technical solutions: A valve core with tire pressure indication includes a positioning sleeve, a core rod is inserted through the positioning sleeve, a return spring is arranged between the positioning sleeve and the core rod, a sealing member for blocking the positioning sleeve is arranged on the core rod, a hollow channel is arranged inside the core rod, a piston is arranged inside the hollow channel, a magnet is arranged on the piston, an elastic airbag communicating with the hollow channel is arranged at one end of the core rod close to the sealing member, the other end of the core rod is blocked by a plug head in threaded fit, a movable ring is sleeved outside the core rod, an iron block is arranged on the movable ring, a first conductive ring is arranged on the movable ring, a second conductive ring and a third conductive ring are fixedly arranged outside the core rod, the movable ring is arranged between the second conductive ring and the third conductive ring, a projection assembly is arranged outside the positioning sleeve, the projection assembly includes a housing, a battery, a lamp body, a first electromagnet and a second electromagnet are arranged inside the housing, a chute is arranged at the light-emitting position of the lamp body, a light-transmitting film is slidably arranged inside the chute, the first electromagnet and the second electromagnet are arranged on both sides of the chute, magnets are arranged on both sides of the light-transmitting film, high tire pressure marks and low tire pressure marks are arranged on the light-transmitting film, one electrode of the battery is connected to the first conductive ring, the other electrode of the battery is divided into two branches, one branch is connected in series with the lamp body, the first electromagnet and the second conductive ring, and the other branch is connected in series with the lamp body, the second electromagnet and the third conductive ring, and the light-transmitting film moves inside the chute to switch the projection imaging. This valve core can cause the elastic airbag to contract or expand when the air pressure in the tire changes, causing the piston to move inside the hollow channel. Due to the attraction between the magnet and the iron block, the movement of the piston can drive the movable ring to move. When the first conductive ring on the movable ring contacts the second conductive ring or the third conductive ring, the first electromagnet or the second electromagnet and the lamp body form a conductive circuit, and the first electromagnet or the second electromagnet attracts the magnet on the light-transmitting film to move it inside the chute. When the high tire pressure mark or the low tire pressure mark on the light-transmitting film aligns with the light-emitting position of the lamp body, a projection of too high or too low tire pressure is projected. Only by replacing the valve core can it have the function of detecting too high or too low tire pressure, greatly reducing the cost of adding a warning function for too high or too low tire pressure to models that originally do not have a tire pressure detection function.

[0006] In the above technical solution, preferably, the positioning sleeve and the projection assembly are connected by a universal ball head, and the projection assembly always obliquely downward due to its own gravity to the light-emitting position. Since the valve core rotates with the rotation of the wheel, if the positioning sleeve and the projection assembly are fixedly connected, the projection positions will be different or it is difficult to form a projection without other objects blocking. And adopting this structure can make the direction of the projected projection always face the ground, so as to project a clearer image on the ground.

[0007] In the above technical solution, preferably, the shell includes a first shell and a second shell, the first shell is connected to the positioning sleeve, the first shell and the second shell are threadedly connected and form a battery compartment inside, the battery is arranged in the battery compartment, the first shell is provided with a first conductive sheet that fits one pole of the battery, the second shell is provided with a second conductive sheet that fits the other pole of the battery, the second conductive sheet is connected to one pole of the lamp body, the other pole of the lamp body is respectively connected to one pole of the first electromagnet and the second electromagnet, the other poles of the first electromagnet and the second electromagnet are respectively connected to a third conductive sheet and a fourth conductive sheet arranged on the side wall of the second shell, the first shell is provided with a first conductor, a second conductor and a third conductor, the first conductor is connected to the first conductive sheet, when the first shell and the second shell are threadedly connected, the second conductor is in contact with the third conductive sheet, the third conductor is in contact with the fourth conductive sheet, the first conductor is connected to the first conductive ring through a wire, the second conductor is connected to the second conductive ring through a wire, and the third conductor is connected to the third conductive ring through a wire. The structure can be used to conveniently replace the battery without affecting the connection of the wires during the battery replacement process. The battery can be taken out for replacement by unscrewing the second housing, which is easy to operate.

[0008] In the above technical solution, preferably, the positioning sleeve is provided with a through hole for connecting the wire, and the through hole is sealed with resin glue after the wire is passed through. Sealing with resin glue is convenient to operate and has good sealing performance.

[0009] In the above technical solution, preferably, the cross section of the hollow channel is non-circular, the outer contour of the piston matches the shape of the hollow channel, the piston includes a piston body, the outer periphery of the piston body is provided with a first sealing ring, the first sealing ring is in contact with the inner wall of the hollow channel, the center of the piston body is provided with an adjustment portion, the adjustment portion is provided with a first air channel, the piston body is provided with a second air channel, the plugging head is provided with a rotating portion, the plugging head side is provided with a fan-shaped opening, a lever connected to the rotating portion is provided in the fan-shaped opening, an extension rod extending axially through the adjustment portion is provided on the rotating portion, the cross section of the extension rod is non-circular, and the lever drives the rotating portion to rotate so that the first air channel is aligned with or staggered from the second air channel. With this structure, the first air channel and the second air channel can be connected or staggered by moving the lever during production or use, and the position of the internal piston can be adjusted by moving the movable ring externally when connected, so that the preset position of the piston of the valve core can be conveniently adjusted, so as to be suitable for tires with various different tire pressures.

[0010] In the above technical solution, preferably, sealing rings are provided between the extension rod and the adjusting part, between the plugging head and the rotating part, and between the piston body and the adjusting part. Adopting this structure can improve the airtightness at the above-mentioned locations.

[0011] The assembling method of the valve core with tire pressure indication includes the following steps: 1) Bond one end of the core rod pipe fitting to the elastic airbag, place the core rod pipe fitting on an air extraction device with an air extraction cavity, with the elastic airbag side located inside the air extraction cavity, and the other end of the core rod pipe fitting is ventilated. The negative pressure inside the air extraction cavity causes the elastic airbag to inhale gas; 2) Place the piston into the hollow channel of the core rod pipe fitting, plug the other end of the core rod pipe fitting with the plugging head, and take out the core rod; 3) Put the first conductive ring on the core rod, and fix the second conductive ring, the third conductive ring, the spring seat and the seal on the outer side of the core rod; 4) Install the core rod into the positioning sleeve; 5) Install the projection component onto the positioning sleeve and complete the circuit connection: Connect one electrode of the battery to the first conductive ring, and divide the other electrode of the battery into two branches. One branch is connected in series with the lamp body, the first electromagnet and the second conductive ring, and the other branch is connected in series with the lamp body, the second electromagnet and the third conductive ring. This assembling method of the valve core can conveniently assemble the core rod and the entire valve core, can conveniently control the initial gas volume in the elastic airbag on the core rod, and improve the assembling efficiency.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This kind of valve core can make the elastic airbag contract or expand when the air pressure in the tire changes, causing the piston to move in the hollow channel. Due to the attraction between the magnet and the iron block, the movement of the piston can drive the movable ring to move. When the first conductive ring on the movable ring contacts the second conductive ring or the third conductive ring, the first electromagnet or the second electromagnet and the lamp body form a conductive circuit. The first electromagnet or the second electromagnet attracts the magnet on the light-transmitting film to move in the chute, and when the high tire pressure mark or the low tire pressure mark on the light-transmitting film aligns with the light-emitting position of the lamp body, a projection of too high or too low tire pressure is projected. Just by replacing the valve core, it can have the function of detecting too high or too low tire pressure, greatly reducing the cost of adding a warning function for too high or too low tire pressure to vehicles that originally do not have a tire pressure detection function. This assembling method of the valve core can conveniently assemble the core rod and the entire valve core, can conveniently control the initial gas volume in the elastic airbag on the core rod, and improve the assembling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a cross-sectional structural schematic diagram of an embodiment of the present invention.

[0014] Figure 2 is Figure 1 a partial enlarged view of

[0015] Figure 3It is a schematic cross-sectional structure diagram of the projection component in the embodiment of the present invention.

[0016] Figure 4 It is a schematic structure diagram of the piston in the embodiment of the present invention.

[0017] Figure 5 It is a schematic structure diagram of the movable ring in the embodiment of the present invention.

[0018] Figure 6 It is a schematic structure diagram of the plugging head in the embodiment of the present invention. Detailed implementation manners

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners: Refer to Figures 1 to 6, A valve core with tire pressure indication, including a positioning sleeve 1. A core rod 2 is inserted through the positioning sleeve 1. A return spring 3 is arranged between the positioning sleeve 1 and the core rod 2. A seal 4 for blocking the positioning sleeve 1 is arranged on the core rod 2. A hollow channel 21 is arranged inside the core rod 2. A piston 5 is arranged inside the hollow channel 21. A magnet 51 is arranged on the piston 5. One end of the core rod 2 close to the seal 4 is provided with an elastic airbag 22 communicated with the hollow channel 21. The other end of the core rod 2 is blocked by a plug 23 with a threaded fit. A movable ring 24 is sleeved outside the core rod 2. An iron block 25 is arranged on the movable ring 24. A first conductive ring 26 is arranged on the movable ring 24. Second and third conductive rings 27 and 28 are fixedly arranged outside the core rod 2. The movable ring 24 is arranged between the second conductive ring 27 and the third conductive ring 28. A projection assembly 6 is arranged outside the positioning sleeve 1. The projection assembly 6 includes a housing 61. A battery 62, a lamp body 63, a first electromagnet 64 and a second electromagnet 65 are arranged inside the housing 61. A chute is arranged at the light-emitting position of the lamp body 63. A light-transmitting film 66 is slidably arranged in the chute. The first electromagnet 64 and the second electromagnet 65 are arranged on both sides of the chute. Magnets 661 are arranged on both sides of the light-transmitting film 66. A high tire pressure mark and a low tire pressure mark are arranged on the light-transmitting film 66. One electrode of the battery 62 is connected to the first conductive ring 26. The other electrode of the battery 62 is divided into two branches. One branch is connected in series with the lamp body 63, the first electromagnet 64 and the second conductive ring 27. The other branch is connected in series with the lamp body 63, the second electromagnet 65 and the third conductive ring 28. The light-transmitting film 66 moves in the chute to switch the projection imaging. This valve core can make the elastic airbag 22 contract or expand when the air pressure in the tire changes, so that the piston 5 moves in the hollow channel 21. Due to the attraction between the magnet 51 and the iron block 25, the movement of the piston 5 can drive the movable ring 24 to move. When the first conductive ring 26 on the movable ring 24 contacts the second conductive ring 27 or the third conductive ring 28, the first electromagnet 64 or the second electromagnet 65 and the lamp body 63 form a conductive circuit. The first electromagnet 64 or the second electromagnet 65 attracts the magnet 661 on the light-transmitting film 66 to move it in the chute. When the high tire pressure mark or the low tire pressure mark on the light-transmitting film 66 aligns with the light-emitting position of the lamp body 63, a projection of too high or too low tire pressure is projected. Only by replacing the valve core can it have the function of detecting too high or too low tire pressure, greatly reducing the cost of installing a too high or too low tire pressure warning function for vehicles originally without a tire pressure detection function.

[0020] Specifically, when the tire pressure is too high, the piston 5 drives the movable ring 24 to move towards the direction of the second conductive ring 27, making the first conductive ring 26 contact the second conductive ring 27, turning on the circuit of the lamp body 63 and the first electromagnet 64. The lamp body 63 emits light. The first electromagnet 64 attracts the light-transmitting film 66 to move. After moving, the mark of too high tire pressure aligns with the light-emitting position of the lamp body 63, and the light projects a projection of too high tire pressure after passing through the light-transmitting film 66.

[0021] When the tire pressure is too low, the piston 5 drives the movable ring 24 to move towards the third conductive ring 28, so that the first conductive ring 26 contacts the second conductive ring 28, connecting the circuit of the lamp body 63 and the second electromagnet 65. The lamp body 63 lights up, and the second electromagnet 65 attracts the light-transmitting film 66 to move. After the movement, the sign of too low tire pressure is aligned with the light-emitting position of the lamp body 63, and the light projects the projection of too low tire pressure after passing through the light-transmitting film 66.

[0022] The transparent part on the light-transmitting film 66 is the text indication or identification symbol of "too high tire pressure" and the text indication or identification symbol of "too low tire pressure", and the rest is the non-light-transmitting part.

[0023] In this embodiment, the positioning sleeve 1 and the projection assembly 6 are connected by a universal ball head. The projection assembly 6 hangs vertically to the light-emitting position by its own gravity and is always inclined downward. Since the valve core rotates with the rotation of the wheel, if the positioning sleeve 1 and the projection assembly 6 are fixedly connected, the projection positions will be different or it will be difficult to form a projection without other objects blocking. However, adopting this structure can make the direction of the projected projection always face the ground, so as to project a relatively clear image on the ground.

[0024] In this embodiment, the housing 61 includes a first housing 611 and a second housing 612. The first housing 611 is connected to the positioning sleeve 1. The first housing 611 and the second housing 612 are threadedly connected and form a battery compartment 67 inside. A battery 62 is arranged in the battery compartment 67. A first conductive sheet 6a that fits one pole of the battery 62 is arranged on the first housing 611. A second conductive sheet 6b that fits the other pole of the battery 62 is arranged on the second housing 612. The second conductive sheet 6b is connected to one pole of the lamp body 63. The other pole of the lamp body 63 is respectively connected to one pole of the first electromagnet 64 and the second electromagnet 65. The other poles of the first electromagnet 64 and the second electromagnet 65 are respectively connected to a third conductive sheet 6c and a fourth conductive sheet 6d arranged on the side wall of the second housing 612. A first conductor 61a, a second conductor 61b, and a third conductor 61c are arranged on the first housing 611. The first conductor 61a is connected to the first conductive sheet 6a. When the first housing 611 and the second housing 612 are threadedly connected, the second conductor 61b contacts the third conductive sheet 6c, and the third conductor 61c contacts the fourth conductive sheet 6d. The first conductor 61a is connected to the first conductive ring 26 through a wire. The second conductor 61b is connected to the second conductive ring 27 through a wire. The third conductor 61c is connected to the third conductive ring 28 through a wire. Adopting this structure can conveniently replace the battery 62, and will not affect the wire connection problem during the process of replacing the battery 62. The battery 62 can be taken out for replacement by unscrewing the second housing 612, and the operation is convenient.

[0025] In this embodiment, the positioning sleeve 1 is provided with a through hole 11 for connecting a wire, and the through hole 11 is sealed with resin glue after the wire is passed through the through hole 11. The resin glue is convenient to operate and has good sealing performance.

[0026] In this embodiment, the cross-section of the hollow channel 21 is non-circular, and the outer contour of the piston 5 matches the shape of the hollow channel 21. The piston 5 includes a piston body 52. ​​A first sealing ring 53 is arranged on the outer periphery of the piston body 52. ​​The first sealing ring 53 is in contact with the inner wall of the hollow channel 21. An adjusting portion 54 is rotatably arranged at the center of the piston body 52. ​​A first air channel 55 is arranged on the adjusting portion 54. A second air channel 56 is arranged on the piston body 52. ​​A rotating portion 231 is rotatably arranged on the plugging head 23. A fan-shaped opening 232 is arranged on the side of the plugging head 23. A lever 233 connected to the rotating portion 231 is arranged in the fan-shaped opening 232. An extension rod 234 extending axially from the rotating portion 231 and passing through the adjustment portion 54 has a non-circular cross-section. The lever 233 drives the rotating portion 231 to rotate so that the first air channel 55 is aligned or staggered with the second air channel 56. By adopting this structure, the first air channel 55 and the second air channel 56 can be connected or staggered by moving the lever 233 during production or use. When connected, the movable ring 24 can be moved externally to adjust the position of the internal piston 5, so that the preset position of the piston 5 of the valve core can be conveniently adjusted, thereby being suitable for tires with various different tire pressures.

[0027] In this embodiment, in order to improve air tightness, sealing rings are provided between the extension rod 234 and the adjusting portion 54 , between the plugging head 23 and the rotating portion 231 , and between the piston body 52 and the adjusting portion 54 .

[0028] The assembly method of the valve core with tire pressure indicator includes the following steps: 1) bonding one end of the core rod tube to the elastic airbag, placing the core rod tube on an exhaust device with an exhaust cavity, the elastic airbag side is located in the exhaust cavity, the other end of the core rod tube is ventilated, and the negative pressure in the exhaust cavity causes the elastic airbag to inhale gas; 2) placing the piston into the hollow channel of the core rod tube, sealing the other end of the core rod tube with a plugging head, and taking out the core rod; 3) inserting the first conductive ring on the core rod, and fixing the second conductive ring, the third conductive ring, the spring seat and the seal on the outside of the core rod; 4) installing the core rod into the positioning sleeve; 5) installing the projection assembly to the positioning sleeve, and completing the circuit connection: connecting one of the electrodes of the battery to the first conductive ring, and the other electrode of the battery is divided into two branches, one of which is connected in series with the lamp body, the first electromagnet and the second conductive ring, and the other branch is connected in series with the lamp body, the second electromagnet and the third conductive ring. The valve core assembly method can conveniently assemble the core rod and the entire valve core, can conveniently control the initial gas volume in the elastic airbag on the core rod, and improve the assembly efficiency.

[0029] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A valve core with tire pressure indication, comprising a positioning sleeve (1), a core rod (2) is inserted through the positioning sleeve (1), a return spring (3) is arranged between the positioning sleeve (1) and the core rod (2), and a seal (4) for blocking the positioning sleeve (1) is arranged on the core rod (2), characterized in that: A hollow channel (21) is provided inside the core rod (2). A piston (5) is arranged inside the hollow channel (21). A magnet (51) is arranged on the piston (5). One end of the core rod (2) close to the seal (4) is provided with an elastic airbag (22) communicating with the hollow channel (21). The other end of the core rod (2) is blocked by a plug head (23) with a threaded fit. A movable ring (24) is sleeved outside the core rod (2). An iron block (25) is arranged on the movable ring (24). A first conductive ring (26) is arranged on the movable ring (24). A second conductive ring (27) and a third conductive ring (28) are fixedly arranged outside the core rod (2). The movable ring (24) is arranged between the second conductive ring (27) and the third conductive ring (28). A projection component (6) is arranged outside the positioning sleeve (1). The projection component (6) includes a housing (61). A battery (62), a lamp body (63), a first electromagnet (64) and a second electromagnet (65) are arranged inside the housing (61). A chute is arranged at the light-emitting position of the lamp body (63). A light-transmitting film (66) is slidably arranged in the chute. The first electromagnet (64) and the second electromagnet (65) are arranged on both sides of the chute. Magnets (661) are arranged on both sides of the light-transmitting film (66). High tire pressure marks and low tire pressure marks are arranged on the light-transmitting film (66). One electrode of the battery (62) is connected to the first conductive ring (26). The other electrode of the battery (62) is divided into two branches. One branch is connected in series with the lamp body (63), the first electromagnet (64) and the second conductive ring (27). The other branch is connected in series with the lamp body (63), the second electromagnet (65) and the third conductive ring (28). The light-transmitting film (66) moves in the chute to switch projection imaging. The positioning sleeve (1) and the projection component (6) are connected by a universal ball head. The projection component (6) always obliquely downward due to its own gravity to the light-emitting position. The cross-section of the hollow channel (21) is non-circular. The outer contour of the piston (5) matches the shape of the hollow channel (21). The piston (5) includes a piston body (52). A first sealing ring (53) is arranged on the outer periphery of the piston body (52). The first sealing ring (53) is attached to the inner wall of the hollow channel (21). An adjusting part (54) is rotatably arranged at the center of the piston body (52). A first air duct (55) is arranged on the adjusting part (54). A second air duct (56) is arranged on the piston body (52). A rotating part (231) is rotatably arranged on the plug head (23). A fan-shaped opening (232) is arranged on the side of the plug head (23). A lever (233) connected to the rotating part (231) is arranged in the fan-shaped opening (232). An extension rod (234) axially extending through the adjusting part (54) is arranged on the rotating part (231). The cross-section of the extension rod (234) is non-circular.The shifting lever (233) shifts the rotating part (231) to rotate so that the first air passage (55) is aligned with or offset from the second air passage (56).

2. The valve core with tire pressure indication according to claim 1, characterized in that: The housing (61) includes a first housing (611) and a second housing (612). The first housing (611) is connected to the positioning sleeve (1). The first housing (611) and the second housing (612) are threadedly connected and form a battery compartment (67) inside. The battery (62) is arranged in the battery compartment (67). A first conductive sheet (6a) that fits one pole of the battery (62) is arranged on the first housing (611). A second conductive sheet (6b) that fits the other pole of the battery (62) is arranged on the second housing (612). One pole of the second conductive sheet (6b) is connected to one pole of the lamp body (63). The other pole of the lamp body (63) is respectively connected to one pole of the first electromagnet (64) and the second electromagnet (65). The other poles of the first electromagnet (64) and the second electromagnet (65) are respectively connected to a third conductive sheet (6c) and a fourth conductive sheet (6d) arranged on the side wall of the second housing (612). A first conductor (61a), a second conductor (61b), and a third conductor (61c) are arranged on the first housing (611). The first conductor (61a) is connected to the first conductive sheet (6a). When the first housing (611) and the second housing (612) are threadedly connected, the second conductor (61b) contacts the third conductive sheet (6c), and the third conductor (61c) contacts the fourth conductive sheet (6d). The first conductor (61a) is connected to the first conductive ring (26) through a wire. The second conductor (61b) is connected to the second conductive ring (27) through a wire. The third conductor (61c) is connected to the third conductive ring (28) through a wire.

3. The valve core with tire pressure indication according to claim 2, characterized in that: A through hole (11) for wire connection is arranged on the positioning sleeve (1). After a wire is passed through the through hole (11), it is sealed with resin glue.

4. The valve core with tire pressure indication according to claim 1, characterized in that: Sealing rings are arranged between the extension rod (234) and the adjusting part (54), between the plugging head (23) and the rotating part (231), and between the piston body (52) and the adjusting part (54).

5. An assembling method of a valve core with tire pressure indication as described in any one of claims 1-4, characterized in that: It includes the following steps: 1) Bond one end of the core rod pipe fitting to the elastic airbag. Place the core rod pipe fitting on an air extraction device with an air extraction cavity. The side of the elastic airbag is located inside the air extraction cavity. The other end of the core rod pipe fitting is ventilated. The negative pressure in the air extraction cavity causes the elastic airbag to inhale gas; 2) Place the piston into the hollow channel of the core rod pipe fitting. Plug the other end of the core rod pipe fitting with the plugging head and take out the core rod; 3) Put the first conductive ring on the core rod, and fix the second conductive ring, the third conductive ring, the spring seat, and the seal on the outer side of the core rod; 4) Install the core rod into the positioning sleeve; 5) Install the projection assembly onto the positioning sleeve and complete the circuit connection: Connect one electrode of the battery to the first conductive ring. The other electrode of the battery is divided into two branches. One branch is connected in series with the lamp body, the first electromagnet, and the second conductive ring. The other branch is connected in series with the lamp body, the second electromagnet, and the third conductive ring.

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