Air pump

Abstract

The air pump of the present invention comprises a housing, a driving member, a gear transmission assembly, a piston rod and a cylinder; the piston rod has a push portion, and the piston rod can push the piston sealing ring toward the cylinder through the push portion; the push portion comprises a first push surface and a second push surface, and a height difference is formed at the position where the first push surface and the second push surface are connected, and when the piston sealing ring acts on the first push surface and the second push surface, an air release channel is formed between the piston sealing ring and the first push surface and the second push surface. The present invention can form an air release channel between the piston sealing ring and the push portion to release the pressure of the gas pushed by the piston sealing ring, so that the piston rod drives the piston sealing ring to move toward the cylinder, so that when the back pressure of the air pump is started, the force applied to the piston rod when it is pushed again is reduced, thereby having the effect of reducing the rated voltage of the driving member on the air pump and expanding the scope of application of the air pump.

Description

Technical Field

[0001] The invention belongs to the technical field related to vehicle-mounted inflation, and in particular relates to an inflation pump. Background Art

[0002] The air pump, also known as an air pump, works by running the motor. When the motor is running, the valve of the connecting vessel is opened by the atmospheric pressure, and the gas enters the air cylinder. When air is inflated into the tire, the valve is closed by the air pressure in the air cylinder, and the gas enters the tire.

[0003] At present, the rated voltage of the motor on the existing air pump is relatively high, and the rated voltage of the motor is usually 5V or above, so as to ensure that when the air pump is started by back pressure, the motor drives the piston rod to continue to move toward the cylinder under the transmission of the gear transmission assembly, that is, to ensure that the air pump can achieve back pressure start. However, the use of a motor with a high rated voltage makes the corresponding size and power of the motor large, thereby reducing the scope of use of the air pump. Summary of the invention

[0004] Based on this, it is necessary to provide an air pump to address the technical problems existing in the prior art.

[0005] Specifically, an air pump comprises a shell, a driving member, a gear transmission assembly, a piston rod and a cylinder; the driving member can drive the piston rod to make reciprocating motion relative to the cylinder through the gear transmission assembly; wherein the piston rod is sleeved with a piston sealing ring at the part extending into the cylinder, and the outer peripheral surface of the piston sealing ring partially abuts against the cylinder wall of the cylinder; the piston rod has a push portion, and the piston rod can push the piston sealing ring to move toward the cylinder through the push portion; the push portion comprises a first push surface and a second push surface, a height difference is formed at the position where the first push surface is connected to the second push surface, and when the piston sealing ring acts on the first push surface and the second push surface, an air release channel is formed between the piston sealing ring and the first push surface and the second push surface.

[0006] As a preferred solution of the present invention, the height difference formed by the connecting position of the first pushing surface and the second pushing surface is 0.04mm-0.08mm.

[0007] As a preferred solution of the present invention, the first push surface and the second push surface are separated by a plane where a parting line on the piston rod is located.

[0008] As a preferred embodiment of the present invention, the piston rod is provided with a plurality of spaced-apart mounting protrusions at the position of the piston sealing ring, wherein each of the mounting protrusions is connected to a limiting protrusion at the end away from the pushing portion, for limiting the piston sealing ring on the mounting protrusion, wherein the length of the mounting protrusion is greater than the height of the piston sealing ring.

[0009] As a preferred solution of the present invention, the cylinder is formed by stretching stainless steel, wherein the surface roughness of the upper cylinder wall of the cylinder is less than 0.8 μm.

[0010] As a preferred embodiment of the present invention, the air pump further comprises a connecting bracket, which is fixedly connected to the housing and is used to limit the cylinder at a position between the housing and the connecting bracket.

[0011] As a preferred embodiment of the present invention, the connecting bracket includes a first branch pipe connected to the air outlet on the cylinder, and a pressure relief valve is provided in the first branch pipe; wherein the pressure relief valve includes a sealing base and a pressure relief spring provided in the first branch pipe, a pressure relief valve cap is screwed at the pipe mouth of the first branch pipe, the pressure relief valve cap is provided with a through hole connected to the first branch pipe, and both ends of the pressure relief spring are respectively abutted against the sealing base and the pressure relief valve cap.

[0012] As a preferred embodiment of the present invention, the connecting bracket has a quick-connect connector for connecting to an external air pipe; wherein a socket is provided on the quick-connect connector, and a pin is detachably connected to the socket position, and when the external air pipe is inserted into the quick-connect connector, the pin is inserted into the socket to limit the external air pipe to the quick-connect connector.

[0013] As a preferred solution of the present invention, the connecting bracket is provided with a check valve and a spring, and the spring pushes the check valve to block the air outlet of the cylinder.

[0014] As a preferred solution of the present invention, a sealing ring is pressed between the connecting bracket and the cylinder.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0016] The air pump provided by the present invention utilizes the reasonable structural setting of the push portion on the piston rod, so that when the piston rod uses the push portion to push the piston sealing ring to move toward the cylinder, an air release channel is formed between the piston sealing ring and the push portion to release the pressure of the gas pushed by the piston sealing ring, thereby facilitating the piston rod to drive the piston sealing ring to move toward the cylinder, so that when the back pressure of the air pump is started, the force acting on the piston rod when it is pushed again is reduced, thereby having the effect of reducing the rated voltage of the driving part on the air pump and expanding the scope of application of the air pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of an air pump provided in one embodiment of the present invention.

[0018] Figure 2 This is an exploded view of an air pump provided in accordance with one embodiment of the present invention.

[0019] Figure 3 for Figure 2 Schematic diagram of the three-dimensional structure of the piston rod in the air pump.

[0020] Among them, 10, housing; 11, base; 111, assembly convex part; 12, cover; 20, driving member; 30, gear transmission assembly; 301, bearing; 302, bearing positioning pin; 31, driving gear; 32, driving gear plate; 321, connecting rod; 40, piston rod; 401, piston sealing ring; 41, push part; 411, first push surface; 412, second push surface; 42, installation convex part; 43, limit convex part; 50, cylinder; 51, air outlet; 60, connecting bracket; 601, check head; 602, spring; 603, sealing ring; 61, first branch pipe; 62, pressure relief valve; 621, sealing base; 622, pressure relief spring; 623, pressure relief valve cap; 624, through hole; 63, second branch pipe; 631, hexagon socket screw; 64, quick connector; 641, socket; 65, pin; 101, long screw. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0023] See also Figure 1-Figure 3 An air pump provided in one embodiment of the present invention includes a housing 10 , a driving member 20 , a gear transmission assembly 30 , a piston rod 40 , a cylinder 50 , and a connecting bracket 60 .

[0024] The housing 10 includes a base 11 and a cover 12 fixed to the base 11 ; wherein the base 11 is provided with an assembly protrusion 111 on an end face of a side away from the cover 12 , and the air pump can be assembled and connected with other components through the assembly protrusion 111 .

[0025] In this embodiment, the cover 12 is configured as a hollow structure to facilitate overall heat dissipation of the air pump.

[0026] The gear transmission assembly 30 is used to convert the rotational motion of the shaft portion of the driving member 20 into a reciprocating motion of the piston rod 40 relative to the cylinder 50 when the driving member 20 is working. It should be noted that the driving member 20 is configured as a motor fixed to the base 11, and the shaft portion of the motor extends into the base 11.

[0027] Specifically, the gear transmission assembly 30 includes a driving gear 31 sleeved on the rotating shaft of the driving member 20, and a driving sprocket 32 ​​meshed with the driving gear 31; wherein the driving sprocket 32 ​​is rotatably connected to the base 11 through a bearing 301 and a bearing locating pin 302, so that the driving member 20 can drive the driving sprocket 32 ​​to rotate through the meshing between the driving gear 31 and the driving sprocket 32.

[0028] Among them, a connecting rod 321 is fixedly connected to the disk surface of the driving toothed disk 32, and the piston rod 40 is rotatably connected to the driving toothed disk 32 through the connecting rod 321, so that when the driving toothed disk 32 rotates, the piston rod 40 can be driven by the connecting rod 321 to perform reciprocating motion relative to the cylinder 50. It should be noted that the position of the connecting rod 321 on the disk surface of the driving toothed disk 32 can be specifically set according to the needs of use, so as to meet the motion drive of the piston rod 40, which will not be elaborated here.

[0029] The piston rod 40 is sleeved with a piston seal ring 401 at the portion extending into the cylinder 50, and the outer peripheral surface of the piston seal ring 401 abuts against the cylinder wall of the cylinder 50, thereby ensuring the sealing of the piston rod 40 and the cylinder 50. It should be noted that the piston seal ring 401 of this embodiment is a leather cup.

[0030] Specifically, the piston rod 40 has a push portion 41 , and the piston rod 40 can push the piston sealing ring 401 toward the cylinder 50 through the push portion 41 , thereby realizing the inflation function of the air pump.

[0031] The push portion 41 of this embodiment includes a first push surface 411 and a second push surface 412, and a height difference is formed at the position where the first push surface 411 and the second push surface 412 are connected, and when the piston sealing ring 401 acts on the first push surface 411 and the second push surface 412, an air leakage channel is formed between the piston sealing ring 401 and the first push surface 411 and the second push surface 412. That is to say, when the piston rod 40 of the present embodiment drives the piston seal ring 401 to move toward the direction of the cylinder 50, the piston seal ring 401 is subjected to the reaction force of the pushed gas, so that the piston seal ring 401 partially abuts against the first abutting surface 411 and the second abutting surface 412, and a venting channel for partial gas discharge is formed at the position where the first abutting surface 411 and the second abutting surface 412 are connected, so that the driving member 20 drives the piston rod 40 when the air pump is started under back pressure, thereby reducing the rated voltage of the driving member 20, so that the air pump is suitable for a motor with a rated voltage of 3.7V. It should be noted that the back pressure start of the air pump of the present embodiment specifically refers to the restart after the air pump is paused during operation, that is, there is a certain pressure of gas in the external air pipe connected to the air pump, and the gas can act in the reverse direction on the piston rod 40, and has a certain resistance to the re-movement of the piston rod 40.

[0032] In this embodiment, the height difference formed by the connecting position of the first push surface 411 and the second push surface 412 is 0.04mm-0.08mm, which is used to meet the air release requirement of the air release channel formed by the first push surface 411, the second push surface 412 and the piston sealing ring 401 when the piston rod 40 is started under back pressure.

[0033] In this embodiment, the first push surface 411 and the second push surface 412 are separated by the plane where the parting line on the piston rod 40 is located, so that the piston rod 40 is conveniently formed as a whole by injection molding of a plastic part in a mold.

[0034] In this embodiment, the piston rod 40 is provided with a plurality of spaced mounting protrusions 42 at the position of the piston seal ring 401, wherein each mounting protrusion 42 is connected to a limiting protrusion 43 at one end away from the push portion 41, so as to limit the piston seal ring 401 on the mounting protrusion 42, wherein the length of the mounting protrusion 42 is greater than the height of the piston seal ring 401. It should be noted that the number of the mounting protrusions 42 and the limiting protrusions 43 in this embodiment are both four.

[0035] As can be seen from the above, in this embodiment, the piston seal ring 401 is sleeved on the mounting protrusion 42 of the piston rod 40, and when the piston seal ring 401 moves toward the direction of the cylinder 50, the push portion 41 can push the piston seal ring 401 to follow the movement of the piston rod 40, and use the piston seal ring 401 to push the gas placed at the bottom of the piston seal ring 401 and the cylinder 50 toward the air outlet hole on the cylinder 50, thereby realizing the inflation function of the air pump when working; and the piston seal ring 401 moves away from the gas When the piston rod 40 moves in the direction of the cylinder 50, the piston sealing ring 401 moves relative to the mounting protrusion 42 under the action of the cylinder wall of the cylinder 50 until it abuts against the limiting protrusion 43. At this time, a gap is formed between the piston sealing ring 401 and the push portion 41, so that when the piston rod 40 moves in the direction away from the cylinder 50, external gas can enter the position between the piston sealing ring 401 and the cylinder 50 through the gap and the gap between the two adjacent mounting protrusions 42, thereby realizing the air intake function of the air pump.

[0036] In this embodiment, the cylinder 50 is formed by stretching stainless steel, wherein the surface roughness of the cylinder wall of the cylinder 50 is less than 0.8 μm, thereby reducing the friction resistance of the piston sealing ring 401 against the cylinder wall of the cylinder 50 when the piston rod 40 drives the piston sealing ring 401 to move relative to the cylinder 50, thereby further reducing the pushing force required by the piston rod 40 when the back pressure of the air pump is working.

[0037] The connecting bracket 60 is fixedly connected to the housing 10, so as to limit the cylinder 50 at a position between the housing 10 and the connecting bracket 60. That is, the cylinder 50 of this embodiment is arranged at a position between the connecting bracket 60 and the housing 10, and then the connection between the connecting bracket 60 and the housing 10 is used to limit the position; wherein the connecting bracket 60 can be fixedly connected to the housing 10 by a plurality of long screws 101 penetrating the connecting bracket 60.

[0038] It can be understood that the connecting bracket 60 is connected and communicated with the cylinder 50, so that the gas discharged from the air outlet 51 of the cylinder 50 can flow along the channel on the connecting bracket 60 to the external air pipe, and finally achieve inflation of the target object.

[0039] In this embodiment, the connecting bracket 60 includes a first branch pipe 61 connected to the air outlet 51 on the cylinder 50, and a pressure relief valve 62 is provided in the first branch pipe 61 to provide pressure relief protection for the working air pump. In other words, the air pump of this embodiment is provided with a rated air pressure at which the air pump can inflate the target object when working through the pressure relief valve 62.

[0040] Specifically, the pressure relief valve 62 includes a sealing base 621 and a pressure relief spring 622 arranged in the first branch pipe 61. A pressure relief valve cap 623 is screwed at the pipe mouth of the first branch pipe 61. The pressure relief valve cap 623 is provided with a through hole 624 connected to the first branch pipe 61. The two ends of the pressure relief spring 622 are respectively abutted against the sealing base 621 and the pressure relief valve cap 623.

[0041] It can be understood that the air pump is connected and communicated with the external air pipe, and then when the air pump works and inflates the target object through the external air pipe, the gas connected to the air outlet 51 of the cylinder 50 and the external air pipe can act on the sealing base 621 through the first branch pipe 61, and generate pressure on the sealing base 621 to compress the pressure relief spring 622. When the air pump continues to work and continues to inflate the target object, when the pressure of the gas acting on the sealing base 621 is large enough, the gas can push the sealing base 621 to compress the pressure relief spring 622, so that the first branch pipe 61 is communicated with the through hole 624 on the pressure relief valve cap 623, thereby realizing the pressure relief function of the pressure relief valve 62.

[0042] The connecting bracket 60 of this embodiment is further provided with a second branch pipe 63 connected with the air outlet 51 on the cylinder 50. The second branch pipe 63 is provided with a pressure sensor (not shown) for detecting the pressure of the target object when the air pump is working.

[0043] In this embodiment, the second branch pipe 63 uses a hexagon socket screw 631 to block the process hole on the second branch pipe 63 (not shown in the figure), and the hexagon socket screw 631 can be set flush with the end of the second branch pipe 63. Compared with the existing air pump that uses a self-tapping screw to block the process hole of the second branch pipe 63 and protrudes relative to the end of the second branch pipe 63, the overall volume of the air pump is reduced, thereby facilitating the assembly of the air pump as a whole with other components.

[0044] The connection bracket 60 of this embodiment has a quick-connect connector 64 for connecting to an external air pipe, thereby facilitating the assembly connection between the air pump and the external air pipe.

[0045] Specifically, a socket 641 is provided on the quick connector 64, and a pin 65 is detachably connected to the socket 641. When the external air pipe is inserted into the quick connector 64, the pin 65 is inserted into the socket 641 to limit the external air pipe to the quick connector 64.

[0046] In this embodiment, the connecting bracket 60 is provided with a check head 601 and a spring 602, and the spring 602 pushes the check head 601 to block. When the air pump of this embodiment is working, when the piston rod 40 moves toward the direction of the cylinder 50, it can push the gas between the cylinder 50 and the piston rod 40 to act on the check head 601, and push the check head 601 to compress the spring 602; when the piston rod 40 moves away from the cylinder 50, the check head 601 blocks the air outlet 51 of the cylinder 50 under the action of the spring 602 and the gas in the connecting bracket 60, thereby preventing the air pump from pumping air from the air outlet 51 of the cylinder 50 when pumping air, thereby ensuring the inflation efficiency of the target object when the air pump is working. Among them, the spring 602 is set as a pagoda spring. It should be noted that when the air pump of this embodiment is working, the driving member 20 drives the piston rod 40 to repeatedly extend into or out of the cylinder 50 under the transmission of the gear transmission assembly 30, so as to continuously inflate the target object when the air pump is working.

[0047] Furthermore, a sealing ring 603 is pressed between the connection bracket 60 and the cylinder 50 to ensure the assembly seal between the cylinder 50 and the connection bracket 60. It should be noted that the sealing ring 603 is a high temperature resistant sealing ring, and a groove (not shown) for assembling the sealing ring 603 is specifically provided on the connection bracket 60 to ensure the assembly position of the sealing ring 603 between the connection bracket 60 and the cylinder 50.

[0048] In summary, the air pump provided by the present invention utilizes the reasonable structural setting of the push portion on the piston rod, so that when the piston rod uses the push portion to push the piston sealing ring to move toward the direction of the cylinder, an air release channel is formed between the piston sealing ring and the push portion to release the pressure of the gas pushed by the piston sealing ring, thereby facilitating the piston rod to drive the piston sealing ring to move toward the direction of the cylinder, so that when the back pressure of the air pump is started, the force acting on the piston rod when it is pushed again is reduced, thereby having the effect of reducing the rated voltage of the driving part on the air pump and expanding the scope of application of the air pump.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An air pump, comprising a housing, a driving member, a gear transmission assembly, a piston rod and a cylinder; the driving member can drive the piston rod to reciprocate relative to the cylinder through the gear transmission assembly; characterized in that: The piston rod is sleeved with a piston seal ring at the portion extending into the cylinder, and the outer peripheral surface of the piston seal ring is partially against the cylinder wall of the cylinder; the piston rod has a push portion, and the piston rod can push the piston seal ring to move toward the cylinder through the push portion; the push portion includes a first push surface and a second push surface, and a height difference is formed at the position where the first push surface and the second push surface are connected, and when the piston seal ring acts on the first push surface and the second push surface, an air leakage channel is formed between the piston seal ring and the first push surface and the second push surface, and the air leakage channel can allow part of the gas to be discharged; Wherein, the height difference formed by the connecting position of the first pushing surface and the second pushing surface is 0.04mm-0.08mm.

2. The air pump according to claim 1, characterized in that: The first push surface and the second push surface are separated by a plane where a parting line on the piston rod is located.

3. The air pump according to claim 1, characterized in that: The piston rod is provided with a plurality of spaced apart mounting protrusions at the position of the piston sealing ring, wherein each of the mounting protrusions is connected to a limiting protrusion at an end away from the push portion, for limiting the piston sealing ring on the mounting protrusion, wherein the length of the mounting protrusion is greater than the height of the piston sealing ring.

4. The air pump according to claim 1, characterized in that: The cylinder is formed by stretching stainless steel, wherein the surface roughness of the upper cylinder wall of the cylinder is less than 0.8 μm.

5. The air pump according to claim 1, characterized in that: The air pump further comprises a connecting bracket, which is fixedly connected to the housing and is used to limit the cylinder at a position between the housing and the connecting bracket.

6. The air pump according to claim 5, characterized in that: The connecting bracket includes a first branch pipe connected to the air outlet on the cylinder, and a pressure relief valve is provided in the first branch pipe; wherein the pressure relief valve includes a sealing base and a pressure relief spring provided in the first branch pipe, a pressure relief valve cap is screwed at the pipe mouth of the first branch pipe, the pressure relief valve cap is provided with a through hole connected to the first branch pipe, and two ends of the pressure relief spring are respectively abutted against the sealing base and the pressure relief valve cap.

7. The air pump according to claim 5, characterized in that: The connecting bracket has a quick-connect connector for connecting to an external air pipe; wherein a socket is provided on the quick-connect connector, and a pin is detachably connected to the socket position, and when the external air pipe is inserted into the quick-connect connector, the pin is inserted into the socket to limit the external air pipe to the quick-connect connector.

8. The air pump according to claim 5, characterized in that: The connecting bracket is provided with a check valve and a spring, and the spring pushes the check valve to block the air outlet of the cylinder.

9. The air pump according to claim 8, characterized in that: A sealing ring is tightly pressed between the connecting bracket and the cylinder.

Images