Air cylinder piston structure of inflator pump

Abstract

The utility model relates to an air cylinder piston structure of an inflator pump. The air cylinder piston structure comprises a crank gear, a connecting rod and an air cylinder body. The crank gear is fixedly connected with the power source, in the embodiment, the power source adopts a motor, and an output shaft of the motor is coaxially fixed with the crank gear or linked with the crank gear through a transmission mechanism; one end of the connecting rod is rotationally installed on the crank gear, a disc-shaped piston part is arranged at the end, away from the crank gear, of the connecting rod, and the connecting rod and the piston part are integrally formed into a whole part; the air cylinder body is located on one side of the crank gear, a sliding cavity in clearance fit with the piston part is formed in the air cylinder body, and the piston part extends into the sliding cavity; an annular groove is coaxially formed in the peripheral side of the piston part, a V-shaped sealing ring is installed in the annular groove, and the V-shaped sealing ring tightly abuts against the side wall of the sliding cavity. The whole structure is simple and efficient, the machining and assembling cost can be effectively reduced, and meanwhile the reliability and the service life of the inflator pump are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of inflator pump discloses a cylinder piston structure of inflator pump. BACKGROUND

[0002] As a common device, the inflator pump is widely used in the fields of automobile tire inflation, inflatable mattress, inflatable toys and the like. The existing inflator pump usually adopts a reciprocating cylinder structure, and realizes the suction and discharge of gas through two one-way valves in different directions. In order to meet the requirements of convenience and miniaturization, the volume of the inflator pump is usually small, and most of the parts are processed by injection molding process.

[0003] In the existing inflator pump technology, one of the core components of the piston structure directly affects the performance and cost of the inflator pump. Figure 1 The common piston structure includes a crank gear, a connecting rod, a cylinder body, a V-shaped sealing ring and a piston rod. The piston rod and the cavity of the cylinder body realize reciprocating motion through sliding fit, and the V-shaped sealing ring is used to ensure the sealing between the piston part and the cylinder. However, due to the large number of components, the injection molding and assembly process is complicated, resulting in high production cost.

[0004] In order to solve the above problems, it is urgent to provide a piston structure with simplified structure, low processing and assembly cost. CONTENT OF THE UTILITY MODEL

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a cylinder piston structure of inflator pump.

[0006] The cylinder piston structure of inflator pump provided by the present application adopts the following technical scheme:

[0007] A cylinder piston structure of inflator pump, comprising a crank gear, a connecting rod and a cylinder body; one end of the connecting rod is eccentrically rotatably installed on the crank gear, and the side of the cylinder body close to the crank gear; the end of the connecting rod away from the crank gear is fixed with a piston part, and the side of the cylinder body close to the crank gear is provided with a sliding cavity in gap fit with the piston part; the piston part is provided with a V-shaped sealing ring on the circumferential side, and the circumferential side of the V-shaped sealing ring is in sliding sealing fit with the inner wall of the sliding cavity.

[0008] By adopting the technical scheme, the crank gear drives the connecting rod to rotate under the driving of the power source, and the connecting rod fixed at one end of the crank gear does the circular motion. The end of the connecting rod away from the crank gear is fixed with the piston part, and the piston part is driven by the crank gear to reciprocate in the sliding cavity of the cylinder body. The V-shaped sealing ring is installed on the periphery of the piston part. When the piston part reciprocates, the V-shaped sealing ring always slides sealingly with the inner wall of the sliding cavity, so that the compressed air cannot leak from the gap between the piston part and the sliding cavity, and the sealing performance and effectiveness of the compression process are ensured.

[0009] Preferably, a ring groove is coaxially arranged on the periphery of the piston part, and the V-shaped sealing ring comprises a supporting part embedded in the ring groove on the periphery of the piston part.

[0010] By adopting the technical scheme, the ring groove provides an accurate installation position for the V-shaped sealing ring. After the supporting part is embedded in the ring groove, the V-shaped sealing ring can effectively prevent axial or radial displacement during reciprocation in the sliding cavity, and the supporting part can maintain the stability of the sealing structure to avoid leakage caused by the displacement of the sealing ring.

[0011] Preferably, the V-shaped sealing ring further comprises a sealing part located on the periphery of the supporting part, and the sealing part abuts and seals against the inner side wall of the sliding cavity.

[0012] By adopting the technical scheme, the sealing part is located on the side of the supporting part away from the connecting rod, and one end of the sealing part abuts and seals against the side wall of the sliding cavity, so that when the piston part reciprocates in the sliding cavity, the abutment and sealing of the sealing part and the side wall of the sliding cavity can ensure the sealing performance of the high-pressure gas.

[0013] Preferably, a first sealing surface and a second sealing surface are arranged on the outer periphery of the sealing part, the first sealing surface is located at one end of the sealing part away from the connecting rod, the second sealing surface is located at one end of the sealing part close to the connecting rod, and the included angle between the first sealing surface and the central axis of the sealing part is smaller than the included angle between the second sealing surface and the central axis of the sealing part.

[0014] By adopting the technical scheme, when the piston reciprocates, the piston part will deform and swing due to the driving of the connecting rod. The different included angles of the first sealing surface and the second sealing surface can better adapt to the deformation and swing of the piston. The first sealing surface with a smaller included angle provides stable sealing when the piston normally moves, and the second sealing surface with a larger included angle can timely adjust the sealing state when the piston swings greatly, thereby reducing the influence of the deformation and swing of the piston on the sealing performance and further reducing the wear of the sealing part.

[0015] Preferably, the end of the connecting rod away from the crank gear is integrally formed with the piston part.

[0016] By adopting the technical scheme, the number of parts and assembly steps are reduced, the labor cost is lowered, and the performance instability caused by assembly errors is avoided.

[0017] Preferably, the piston part comprises a first annular flange and a second annular flange, and the annular groove is formed between the first annular flange and the second annular flange; the first annular flange is located on the side of the annular groove close to the connecting rod, and the diameter of the first annular flange is greater than the maximum expansion diameter of the V-shaped sealing ring; the second annular flange is located on the side of the annular groove away from the connecting rod, and the V-shaped sealing ring can expand through the second annular flange.

[0018] By adopting the technical scheme, when the V-shaped sealing ring is installed, the V-shaped sealing ring can be expanded to have an inner diameter greater than the diameter of the second annular flange, and then the V-shaped sealing ring is sleeved in the axial direction of the piston part to reach the annular groove position. At this time, the V-shaped sealing ring restores to the original state due to its elasticity, and the supporting part of the V-shaped sealing ring is embedded in the annular groove. At the same time, due to the blocking of the first annular flange, the V-shaped sealing ring cannot be pulled out to the side close to the connecting rod, so that the stable installation of the V-shaped sealing ring in the annular groove is realized, and the sealing function of the V-shaped sealing ring during the movement of the piston part is ensured, and gas leakage is prevented.

[0019] Preferably, the second annular flange is detachably provided with a flange extension on the side.

[0020] By adopting the technical scheme, the flange extension and the second annular flange are connected by bolts. The detachable design not only facilitates the installation and maintenance of the V-shaped sealing ring, but also enables quick replacement when the sealing ring is worn or damaged, thereby improving the maintainability and service life of the structure.

[0021] Preferably, the piston part is provided with a first annular flange at the end close to the connecting rod, and the diameter of the first annular flange is greater than the maximum expansion diameter of the sealing ring; a third annular flange is mounted on the piston part, and the third annular flange is detachably mounted on the side of the piston part away from the connecting rod, and the annular groove is formed between the first annular flange and the third annular flange.

[0022] By adopting the technical scheme, the first annular flange and the third annular flange jointly constitute an annular groove, and the V-shaped sealing ring is stably installed therein. When the piston part reciprocates, the V-shaped sealing ring can normally play a sealing role, and gas leakage from the gap between the piston part and the sliding cavity is prevented. The detachable design of the third annular flange makes the installation and maintenance of the V-shaped sealing ring more convenient, and ensures the stable installation of the V-shaped sealing ring in the annular groove, preventing displacement or falling of the V-shaped sealing ring during the movement of the piston.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The crank gear is driven by a power source to drive the connecting rod to rotate, and the connecting rod is fixed at one end of the crank gear to make a circular motion. The end of the connecting rod away from the crank gear is fixed with a piston part, and the piston part is driven by the crank gear to reciprocate in the sliding cavity of the cylinder body. The piston part is provided with a V-shaped sealing ring on the side; when the piston part reciprocates, the V-shaped sealing ring always slides sealingly with the inner wall of the sliding cavity, ensuring that compressed air does not leak from the gap between the piston part and the sliding cavity, and ensuring the sealing and effectiveness of the compression process.

[0025] 2. The ring groove provides a precise installation position for the V-shaped sealing ring. After the support part is embedded in the ring groove, the V-shaped sealing ring can effectively prevent axial or radial displacement during reciprocation in the sliding cavity. The support part can maintain the stability of the sealing structure and prevent leakage caused by the displacement of the sealing ring.

[0026] 3. The sealing part is located on the side away from the connecting rod of the support part, and one end of the sealing part abuts and seals with the side wall of the sliding cavity, so that when the piston part reciprocates in the sliding cavity, the abutment and sealing of the sealing part with the side wall of the sliding cavity can ensure the sealing performance of the high-pressure gas. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of a common air pump piston;

[0028] Figure 2 is a structural schematic diagram of example 1 showing that the axis of the connecting rod and the cylinder body coincide;

[0029] Figure 3 is a structural schematic diagram of example 1 showing that the crank gear drives the connecting rod to rotate 90°;

[0030] Figure 4 is Figure 2 is an enlarged view of A in FIG. 6;

[0031] Figure 5 is a schematic diagram of the overall structure of example 2.

[0032] FIG. 1 is a crank gear; 2, a connecting rod; 3, a cylinder body; 4, a piston part; 41, a first annular flange; 42, a second annular flange; 43, a flange extension; 44, a third annular flange; 5, a sliding cavity; 6, a ring groove; 7, a V-shaped sealing ring; 71, a support part; 72, a sealing part; 721, a first sealing surface; 722, a second sealing surface. DETAILED DESCRIPTION

[0033] The embodiments of the present application disclose a cylinder piston structure of an air pump.

[0034] Example 1

[0035] A cylinder piston structure of an inflator pump, referring to Figure 2 , including a crank gear 1, a connecting rod 2 and a cylinder body 3; the crank gear 1 is fixedly connected with a power source, in this embodiment, the power source adopts a motor, the output shaft of the motor is coaxially fixed with the crank gear 1 or is connected through a transmission mechanism; one end of the connecting rod 2 is rotatably installed on the crank gear 1, a disc-shaped piston part 4 is arranged at the end of the connecting rod 2 away from the crank gear 1, the connecting rod 2 and the piston part 4 are an integrally formed whole component; the cylinder body 3 is located at one side of the crank gear 1, a sliding cavity 5 is formed on the cylinder body 3 and is in clearance fit with the piston part 4, the piston part 4 extends into the sliding cavity 5; a ring groove 6 is coaxially formed on the circumferential side of the piston part 4, a V-shaped sealing ring 7 is installed in the ring groove 6, and the V-shaped sealing ring 7 is in close abutment with the side wall of the sliding cavity 5.

[0036] When the cylinder piston structure of the inflator pump works, the motor as a power source drives the crank gear 1 fixedly connected therewith to rotate. During the rotation of the crank gear 1, the connecting rod 2 installed on the crank motor moves. Since one end of the connecting rod 2 is rotatably installed on the crank gear 1 and the other end is formed with the disc-shaped piston part 4, and the piston part 4 is located in the sliding cavity 5 of the cylinder body 3 and is in clearance fit therebetween, the circumferential movement of the crank gear 1 is converted into the reciprocating movement of the piston part 4 in the sliding cavity 5 through the connecting rod 2. The V-shaped sealing ring 7 keeps close abutment with the side wall of the sliding cavity 5 through its own deformation when the piston part 4 moves, preventing gas from leaking from the clearance between the piston part 4 and the sliding cavity 5 and ensuring the gas compression efficiency.

[0037] Referring to Figure 3 and Figure 4 , specifically, the V-shaped sealing ring 7 includes a supporting part 71 and a sealing part 72, the supporting part 71 is embedded in the ring groove 6 on the circumferential side of the piston part 4, and the sealing part 72 is located on the side of the piston part 4 away from the connecting rod 2 and is in abutment sealing with the inner side wall of the sliding cavity 5, the supporting part 71 and the sealing part 72 are an integrally formed whole component; the supporting part 71 and the sealing part 72 are integrally formed, which is simple in structure and easy to install. The integrally formed design reduces the number of parts, reduces the assembly difficulty, and improves the reliability of the overall structure.

[0038] Further, a first sealing surface 721 is arranged on the outer circumferential side of the sealing part 72, the first sealing surface 721 is located at the end of the sealing part 72 away from the connecting rod 2, when the central axis of the connecting rod 2 coincides with the central axis of the cylinder body 3, the first sealing surface 721 on the sealing part 72 is in abutment sealing with the inner side wall of the sliding cavity 5.

[0039] The outer periphery side of the sealing part 72 is further provided with a second sealing surface 722, which is located at one end of the sealing part 72 close to the connecting rod 2. When the crank gear 1 drives the connecting rod 2 to rotate by 90°, the center axis of the connecting rod 2 and the center axis of the cylinder body 3 have the maximum deviation angle. At this time, the side of the piston part 4 close to the crank gear 1 is sealed by abutting the first sealing surface 721 against the inner side wall of the sliding cavity 5, and the side of the piston part 4 away from the crank gear 1 is sealed by abutting the second sealing surface 722 against the inside of the sliding cavity 5.

[0040] Specifically, the piston part 4 includes a first annular flange 41 and a second annular flange 42, and a ring groove 6 is formed between the first annular flange 41 and the second annular flange 42; the first annular flange 41 is located at one side of the ring groove 6 close to the connecting rod 2, and the second annular flange 42 is located at one side of the ring groove 6 away from the connecting rod 2, and the V-shaped sealing ring 7 is fixedly installed in the ring groove 6 through the first annular flange 41 and the second annular flange 42.

[0041] Further, the diameter of the first annular flange 41 is greater than the maximum expanded diameter of the V-shaped sealing ring 7, and the diameter of the second annular flange 42 is less than the maximum expanded diameter of the V-shaped sealing ring 7; when installing the V-shaped sealing ring 7, the V-shaped sealing ring 7 can be expanded, so that its inner diameter is greater than the diameter of the second annular flange 42, and then the V-shaped sealing ring 7 is sleeved in the axial direction of the piston part 4, so that the V-shaped sealing ring 7 reaches the position of the ring groove 6. At this time, the V-shaped sealing ring 7 will restore to its original state due to its elasticity, and the supporting part 71 of the V-shaped sealing ring 7 is embedded in the ring groove 6, and at the same time, the V-shaped sealing ring 7 will not come out to the side close to the connecting rod 2 due to the blockage of the first annular flange 41, so as to realize the stable installation of the V-shaped sealing ring 7 in the ring groove 6, ensure that it can normally play a sealing role in the movement process of the piston part 4, prevent gas leakage, and ensure the normal operation of the cylinder piston structure of the air pump.

[0042] Further, the second annular flange 42 is provided with a flange extension 43, which is fixedly installed on the periphery side of the second annular flange 42 through bolts; when the V-shaped sealing ring 7 is installed in the ring groove 6, the flange extension 43 can further limit the V-shaped sealing ring 7, preventing it from being axially displaced or falling off during the movement of the piston part 4. The flange extension 43 is connected with the second annular flange 42 through bolts, and this detachable design not only facilitates the installation and maintenance of the V-shaped sealing ring 7, but also enables quick replacement when the sealing ring is worn or damaged, thereby improving the maintainability and service life of the structure.

[0043] The principle of the application is that the cylinder piston structure of the air pump is driven by the rotation of the motor to drive the crank gear 1, the connecting rod 2 and the piston part 4 to reciprocate in the cylinder body 3, so as to realize the suction and discharge of gas. The V-shaped sealing ring 7 ensures the sealing of the cylinder body 3 and prevents gas leakage. The whole structure is simple and efficient, which can effectively reduce the processing and assembly cost, and at the same time ensure the reliability and service life of the air pump.

[0044] Embodiment 2

[0045] Reference Figure 5 The difference between the present embodiment and embodiment 1 is that, specifically, the piston part 4 is provided with a first annular flange 41 on the side close to the connecting rod 2, and a third annular flange 44 on the side away from the connecting rod 2, and the third annular flange 44 is fixedly installed on the side away from the connecting rod 2 of the piston part 4 by bolts; further, an annular groove 6 for installing the V-shaped sealing ring 7 is formed between the first annular flange 41 and the third annular flange 44, and the diameter of the first annular flange 41 is greater than the maximum expanded diameter of the V-shaped sealing ring 7. During installation, first, the third annular flange 44 is disassembled from the piston part 4, the V-shaped sealing ring 7 is expanded so that its inner diameter is greater than the outer diameter of the piston part 4, then the V-shaped sealing ring 7 is axially sleeved from the side away from the connecting rod 2 of the piston part 4 until it reaches the position of the first annular flange 41, and then the third annular flange 44 is installed back on the side away from the connecting rod 2 of the piston part 4 and fixed by bolts. After fixing, the first annular flange 41 and the third annular flange 44 jointly form a closed annular groove 6, and the V-shaped sealing ring 7 is stably installed therein. It is ensured that the V-shaped sealing ring 7 can normally play a sealing role when the piston part 4 reciprocates, preventing gas from leaking from the gap between the piston part 4 and the sliding cavity 5, and further ensuring the normal operation of the air pump cylinder piston structure.

[0046] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A cylinder piston structure of an inflator pump, characterized by, The application relates to a piston-crank mechanism, which comprises a crank gear (1), a connecting rod (2) and a cylinder body (3); one end of the connecting rod (2) is eccentrically rotatably arranged on the crank gear (1), and the cylinder body (3) is arranged on one side of the crank gear (1); a piston part (4) is fixed to one end of the connecting rod (2) away from the crank gear (1), and a sliding cavity (5) is arranged on one side of the cylinder body (3) close to the crank gear (1) and in clearance fit with the piston part (4); a V-shaped sealing ring (7) is arranged on the periphery of the piston part (4) and in sliding sealing fit with the inner wall of the sliding cavity (5).

2. An air cylinder piston structure for an inflator pump according to claim 1, wherein A ring groove (6) is coaxially arranged on the periphery of the piston part (4); the V-shaped sealing ring (7) comprises a supporting part (71) which is embedded in the ring groove (6) on the periphery of the piston part (4).

3. A cylinder and piston arrangement for a pneumatic pump according to claim 2, wherein, The V-shaped sealing ring (7) further comprises a sealing part (72) which is arranged on the periphery of the supporting part (71) and abuts against and seals the inner wall of the sliding cavity (5).

4. A cylinder and piston arrangement for a pump as claimed in claim 3, wherein, A first sealing surface (721) and a second sealing surface (722) are arranged on the outer periphery of the sealing part (72), the first sealing surface (721) is arranged on one end of the sealing part (72) away from the connecting rod (2), the second sealing surface (722) is arranged on one end of the sealing part (72) close to the connecting rod (2), and the included angle between the first sealing surface (721) and the central axis of the sealing part (72) is smaller than the included angle between the second sealing surface (722) and the central axis of the sealing part (72).

5. An air cylinder piston structure for an inflator pump according to claim 1, wherein The one end of the connecting rod (2) away from the crank gear (1) is integrally formed with the piston part (4).

6. An air cylinder piston structure for an inflator pump according to claim 2, wherein The piston part comprises a first annular flange and a second annular flange, the ring groove is formed between the first annular flange and the second annular flange, the first annular flange is arranged on one side of the ring groove close to the connecting rod, the diameter of the first annular flange is larger than the maximum expansion diameter of the V-shaped sealing ring, the second annular flange is arranged on one side of the ring groove away from the connecting rod, and the V-shaped sealing ring can expand through the second annular flange.

7. A cylinder and piston arrangement for a pneumatic pump according to claim 6, wherein, A flange extension part is detachably arranged on the periphery of the second annular flange.

8. A cylinder and piston structure for an inflator pump according to claim 2, wherein The piston part is provided with a first annular flange on one end close to the connecting rod, the diameter of the first annular flange is larger than the maximum expansion diameter of the sealing ring, a third annular flange is arranged on the piston part, the third annular flange is detachably arranged on one side of the piston part away from the connecting rod, and the ring groove is formed between the first annular flange and the third annular flange.

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