A piston for a car air pump

Abstract

This application relates to the field of air pump technology, specifically disclosing a piston for a vehicle air pump. The piston includes a piston, a stem, and a piston seat. The piston seat is located at one end of the stem, and a connecting post is provided on the piston seat. The connecting post is cylindrical, and its diameter is smaller than that of the piston seat. A venting groove is formed on the outer peripheral wall of the connecting post. A sealing ring is fitted onto the outer peripheral wall of the connecting post, with its bottom abutting against the surface of the piston seat. This application improves the intake efficiency of the piston.

Description

Technical Field

[0001] This application relates to the field of air pump technology, and in particular to a piston for an automotive air pump. Background Technology

[0002] A car air pump, also known as an inflator, tire inflator, or vehicle air pump, primarily works by the operation of an internal motor. As a common inflation tool, car air pumps play a crucial role in car repair and daily use.

[0003] In related technologies, the piston head is cylindrical, and a sealing ring is fitted onto this cylindrical piston head to form a seal with the cylinder. When the car air pump is working, the motor drives the eccentric wheel to rotate through the reduction gear. The eccentric wheel and the piston form a crank-connecting rod mechanism. The eccentric wheel drives the piston to move in the cylinder. When the piston moves away from the cylinder, a gap appears between the sealing ring and the cylinder, and gas enters the cylinder. When the piston moves closer to the cylinder, the sealing ring seals tightly with the cylinder, and the piston forces the gas out of the inflation tube into the tire.

[0004] In actual use, it was found that because the piston and cylinder are closely fitted together and the air intake gap is very small, the air intake efficiency is low. Therefore, the motor needs to consume more power to drive the piston. Utility Model Content

[0005] In order to improve the intake efficiency of the piston, this application provides a vehicle air pump piston that has the effect of improving the intake efficiency of the piston.

[0006] The technical solution for a vehicle air pump piston provided in this application is as follows: A piston for a vehicle air pump includes a piston, which comprises a stem and a piston seat. The piston seat is disposed at one end of the stem, and a connecting post is disposed on the piston seat. The connecting post is cylindrical, and its diameter is smaller than that of the piston seat. A venting groove is formed on the outer peripheral wall of the connecting post, and the opening direction of the venting groove is consistent with the movement direction of the piston. A sealing ring is fitted on the outer peripheral wall of the connecting post, and the bottom of the sealing ring abuts against the surface of the piston seat.

[0007] By adopting the above technical solution, when the motor drives the piston to perform reciprocating linear motion, and the piston moves away from the cylinder, the volume inside the cylinder increases and the air pressure decreases, forming a negative pressure environment. At this time, external gas enters the cylinder through the venting groove, completing the gas intake process. When the piston moves closer to the cylinder, the volume inside the cylinder decreases and the air pressure increases. The high-pressure gas exerts an outward pushing force on the sealing ring, causing the sealing ring to squeeze the inner wall of the cylinder and the piston seat, forming a sealing structure and completing the gas compression process. The venting groove on the outer peripheral wall of the connecting column provides a guiding function for gas intake, and the direction of the venting groove is consistent with the direction of piston movement, effectively improving the piston's intake efficiency.

[0008] Optionally, the connecting post is provided with a retaining plate, the diameter of which is larger than that of the connecting post. The retaining plate, the piston seat, and the connecting post form a channel for accommodating the sealing ring, and the vent groove extends through the outer surface of the retaining plate.

[0009] By adopting the above technical solution, when the piston reciprocates, the retaining plate prevents the sealing ring from detaching from the connecting post when the sealing ring contacts the retaining plate. The retaining plate has a limiting effect on the sealing ring, which helps to improve the sealing stability of the sealing ring.

[0010] Optionally, the card holder has an easy-removal slot, and the ventilation slot is connected to the easy-removal slot.

[0011] By adopting the above technical solution, when the sealing ring is worn or aged, the sealing ring can be removed from the channel by inserting a finger or a pry bar into the easy-removal groove, making it convenient to replace and maintain the sealing ring on the piston.

[0012] Optionally, multiple easy-removal slots are provided, and the multiple easy-removal slots are distributed at intervals along the circumference of the card receiving plate.

[0013] By adopting the above technical solution, the multiple circumferentially spaced easy-access slots evenly distribute the intake airflow to the circumference of the retaining plate, so that the circumferential force of the retaining plate is consistent, reducing the deformation of the retaining plate caused by local force concentration in the unidirectional easy-access slots, and also facilitating the replacement of the sealing ring from multiple directions.

[0014] Optionally, the outer peripheral wall of the bottom end of the connecting column is bent outward to fit the outer wall of the sealing ring.

[0015] By adopting the above technical solution, the outer wall of the bottom end of the connecting column is tightly fitted with the sealing ring, reducing the gap between the bottom end of the connecting column and the sealing ring, thereby reducing gas leakage and improving the sealing performance of the sealing ring.

[0016] Optionally, the handle may have multiple weight-reducing grooves.

[0017] By adopting the above technical solution and creating weight-reducing grooves, it is beneficial to reduce the weight of the handle and improve its movement efficiency.

[0018] Optionally, a connecting hole is provided at the end of the handle away from the piston seat, and a bearing is provided on the inner wall of the connecting hole.

[0019] By adopting the above technical solution, the inner ring of the bearing is connected to the output shaft of the eccentric wheel, and the outer ring is fixed to the inner wall of the connecting hole. The eccentric wheel drives the inner ring of the bearing to move, and the outer ring moves linearly with the piston, which effectively reduces frictional resistance and improves the stability of the piston's linear movement.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. When the motor drives the piston to reciprocate linearly, as the piston moves away from the cylinder, the volume inside the cylinder increases and the air pressure decreases, creating a negative pressure environment. At this time, external gas enters the cylinder through the venting groove, completing the gas intake process. When the piston moves closer to the cylinder, the volume inside the cylinder decreases and the air pressure increases. The high-pressure gas exerts an outward pushing force on the sealing ring, causing the sealing ring to squeeze the inner wall of the cylinder and the piston seat, forming a sealing structure and completing the gas compression process. The venting groove on the outer peripheral wall of the connecting column provides a guiding function for gas intake, and the direction of the venting groove is consistent with the direction of piston movement, effectively improving the piston's intake efficiency. 2. During the reciprocating motion of the piston, when the sealing ring contacts the retaining plate, the retaining plate can prevent the sealing ring from detaching from the connecting post. The retaining plate has a limiting effect on the sealing ring, which helps to improve the sealing stability of the sealing ring. 3. When the sealing ring is worn or aged, insert your finger or a lever into the easy-remove groove to remove the sealing ring from the channel, making it easier to replace and maintain the sealing ring on the piston. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the overall structure of the piston of the vehicle air pump in this application, with the sealing ring fitted onto the piston; Figure 2 This is a schematic diagram of the piston display channel of the vehicle air pump of this application.

[0022] Reference numerals: 1. Piston; 101. Handle; 102. Piston seat; 2. Connecting post; 3. Vent groove; 4. Snap-fit ​​plate; 5. Easy-remove groove; 6. Weight reduction groove; 7. Connecting hole; 8. Bearing; 9. Sealing ring; 10. Channel. Detailed Implementation

[0023] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0024] This application discloses a piston for a vehicle air pump, referring to... Figure 1 and Figure 2 The piston 1 consists of a handle 101 and a piston seat 102. One end of the handle 101 is integrally connected to the center of the bottom end of the piston seat 102. The piston seat 102 is disc-shaped. A connecting post 2 is integrally formed on the surface of the end of the piston seat 102 away from the handle 101. The connecting post 2 is cylindrical and its diameter is smaller than that of the piston seat 102. Multiple ventilation grooves 3 are opened vertically around the connecting post 2. The ventilation grooves 3 are spaced apart and their direction is consistent with the direction of piston 1 movement. A sealing ring 9 is fitted on the connecting post 2. The outer surface of the connecting post 2 abuts against the inner surface of the sealing ring 9, and the bottom end of the sealing ring 9 abuts against the piston seat 102.

[0025] When the handle 101 moves the piston seat 102 away from the cylinder, the sealing ring 9 separates from the piston seat 102, and external gas can enter the cylinder through multiple venting grooves 3 and the gap between the sealing ring 9 and the cylinder. When the handle 101 moves the piston seat 102 closer to the cylinder, the sealing ring 9 abuts against the piston seat 102, and the sealing ring 9 tightly seals the cylinder to prevent gas from flowing out. The venting grooves 3 effectively increase the area of ​​the air inlet, thereby improving the intake efficiency of the piston 1. The sealing ring 9, the connecting column 2, and the piston seat 102 form a one-way valve structure, eliminating the need for an additional one-way valve on the cylinder, which simplifies the structure of the air pump.

[0026] Reference Figure 2 The connecting column 2 is recessed outward at one end near the piston seat 102 to form an arc-shaped contact surface, which facilitates tight wrapping of the bottom end of the sealing ring 9 and improves the sealing effect of the sealing ring 9.

[0027] Reference Figure 1 and Figure 2 A retaining plate 4 is integrally formed on the connecting column 2. The retaining plate 4 is located at the end of the connecting column 2 away from the piston seat 102. The diameter of the retaining plate 4 is larger than the diameter of the connecting column 2. The retaining plate 4, the piston seat 102 and the connecting column 2 form a channel 10. The sealing ring 9 is located in the channel 10. The venting groove 3 on the connecting column 2 passes through the retaining plate 4. When the sealing ring 9 is separated from the piston seat 102, the retaining plate 4 can prevent the sealing ring 9 from detaching from the connecting column 2, which is conducive to maintaining the stable sealing state of the sealing ring 9.

[0028] Reference Figure 2The retaining plate 4 has an easy-removal groove 5, which is opened at the position of the vent groove 3. Multiple easy-removal grooves 5 are spaced apart and distributed along the periphery of the retaining plate 4. The vent groove 3 is connected to the easy-removal groove 5. In this embodiment, the easy-removal groove 5 is arranged in a fan shape, which can reduce the contact area between the retaining plate 4 and the sealing ring 9, making it easier to install and remove the sealing ring 9 with the help of tools, and facilitating the replacement and maintenance of the sealing ring 9 on the piston seat 102.

[0029] Reference Figure 2 The handle 101 has multiple weight-reducing grooves 6 along its axial direction. In this embodiment, four weight-reducing grooves 6 are provided, which helps to reduce the overall weight and the drive load of the motor, and improves the stability of the movement of the handle 101. The end of the handle 101 away from the piston seat 102 forms a circular structure and has a connecting hole 7. A bearing 8 is fixedly connected in the connecting hole 7 for connecting the transmission component.

[0030] The implementation principle of the vehicle air pump piston disclosed in this application embodiment is as follows: When the piston 1 moves away from the cylinder, the sealing ring 9 separates from the piston seat 102, and the external gas enters the cylinder through the ventilation groove 3 and the easy-access groove 5 in sequence. The multi-channel 10 design of the ventilation groove 3 expands the air intake area and effectively improves the air intake efficiency. When the piston 1 moves closer to the cylinder, the sealing ring 9 is pressed against the piston seat 102 by the air pressure and fits tightly against the piston seat 102. With the arc-shaped fitting surface at the bottom of the connecting column 2 covering the sealing ring 9, the cylinder is sealed, preventing gas leakage and forming a one-way valve structure. That is, there is no need to set an additional one-way valve structure in the cylinder, which effectively simplifies the overall structure of the air pump.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A piston for a vehicle air pump, characterized in that: The piston (1) includes a handle (101) and a piston seat (102). The piston seat (102) is located at one end of the handle (101). A connecting post (2) is provided on the piston seat (102). The connecting post (2) is cylindrical and its diameter is smaller than that of the piston seat (102). A venting groove (3) is provided on the outer peripheral wall of the connecting post (2). The opening direction of the venting groove (3) is consistent with the movement direction of the piston (1). A sealing ring (9) is fitted on the outer peripheral wall of the connecting post (2), and the bottom of the sealing ring (9) abuts against the surface of the piston seat (102).

2. The vehicle air pump piston according to claim 1, characterized in that, The connecting post (2) is provided with a retaining plate (4), the diameter of the retaining plate (4) is larger than the diameter of the connecting post (2), the retaining plate (4), the piston seat (102) and the connecting post (2) form a channel (10) for accommodating the sealing ring (9), and the vent groove (3) penetrates through the outer surface of the retaining plate (4).

3. The vehicle air pump piston according to claim 2, characterized in that, The card holder (4) has an easy-access slot (5), and the ventilation slot (3) is connected to the easy-access slot (5).

4. The vehicle air pump piston according to claim 3, characterized in that, The easy-access slot (5) has multiple slots, which are distributed at intervals along the circumference of the card plate (4).

5. The vehicle air pump piston according to claim 1, characterized in that, The ventilation slots (3) are spaced apart and are provided in multiples, with the multiple ventilation slots (3) being opened along the axial direction of the connecting column (2).

6. The vehicle air pump piston according to claim 1, characterized in that, The outer peripheral wall of the bottom end of the connecting column (2) is bent outward to fit the outer wall of the sealing ring (9).

7. The automotive air pump piston according to claim 1, characterized in that, The handle (101) has multiple weight-reducing grooves (6).

8. The automotive air pump piston according to claim 1, characterized in that, The handle (101) has a connecting hole (7) at the end away from the piston seat (102), and a bearing (8) is provided on the inner wall of the connecting hole (7).

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