A two-stage piston assembly and air compressor

Abstract

The utility model relates to a kind of two-stage piston assembly, including first piston connecting rod mechanism, second piston connecting rod mechanism being set on the first piston connecting rod mechanism and the connecting assembly being connected on first piston connecting rod mechanism and second piston connecting rod mechanism, first piston connecting rod mechanism includes first connecting rod and the first piston assembly being set in the first connecting rod end, and first connecting rod is frame type openwork structure, second piston connecting rod mechanism includes second connecting rod and the second piston assembly being set in the second connecting rod end, and the end of second connecting rod away from second piston assembly is set in the openwork structure of first connecting rod inside.The utility model improves assembly efficiency by setting first, second piston connecting rod mechanism, while reducing maintenance cost and time, respectively using independent integrated structure, improve the operating stability and service life of piston assembly.The utility model is also related to an air compressor.

Description

Technical Field

[0001] This utility model relates to the field of automotive air compression equipment, specifically to a two-stage piston assembly and an air compressor. Background Technology

[0002] As the core component of the air suspension system, the air compressor's function is to provide dry compressed air to the air suspension system and input the compressed air into the air tank or air spring to complete the leveling of the vehicle body height.

[0003] The main function of an air compressor is to compress and increase the external low-pressure gas into high-pressure gas through the piston assembly's piston movement within the cylinder, which is then fed into the air tank or air spring. Therefore, the piston assembly, as a crucial component of the air compressor, requires high stability. For vertically oriented two-stage piston assemblies, the drive component located in the central part of the piston assembly needs to perform eccentric movement under the action of rotating components. In existing piston assemblies, the piston components and connecting rods are mostly designed separately, requiring repeated coaxiality calibration during installation. Furthermore, the disassembly process is complex when replacing vulnerable parts, resulting in poor assembly and maintenance convenience and low production efficiency.

[0004] Therefore, it is necessary to provide a new two-stage piston assembly and air compressor. Utility Model Content

[0005] In view of this, the present invention provides a two-stage piston assembly and air compressor that improves assembly efficiency by setting up first and second piston connecting rod mechanisms, while reducing maintenance costs and time. The piston assembly adopts an independent integrated structure, which improves the operational stability and service life of the piston assembly.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a two-stage piston assembly is provided for an air compressor. The two-stage piston assembly includes a first piston connecting rod mechanism, a second piston connecting rod mechanism sleeved on the first piston connecting rod mechanism, and a connecting assembly connecting the first piston connecting rod mechanism and the second piston connecting rod mechanism. The first piston connecting rod mechanism includes a first connecting rod and a first piston assembly disposed at the end of the first connecting rod. The first connecting rod has a frame-type hollow structure. The second piston connecting rod mechanism includes a second connecting rod and a second piston assembly disposed at the end of the second connecting rod. The end of the second connecting rod away from the second piston assembly is sleeved in the hollow structure of the first connecting rod.

[0007] Furthermore, one end of the first connecting rod is provided with a first mounting part, the outer wheel of the first mounting part is circular, a first air inlet is provided on the first mounting part, and one end of the first connecting rod is connected to the first piston assembly through the first mounting part.

[0008] Furthermore, the first connecting rod has a first connecting hole located away from the first piston assembly. The first connecting hole cooperates with the connecting assembly, and the other end of the first connecting rod is connected to the connecting assembly through the first connecting hole.

[0009] Furthermore, the first piston assembly includes a first piston, a first piston ring disposed on the side of the first piston, a one-way valve plate mounted on the first piston, and a fixing bolt.

[0010] Furthermore, the first piston is disc-shaped, and the diameter of the first piston matches the diameter of the first mounting part. A second air inlet is provided on the first piston, and the position of the second air inlet corresponds to the position of the first air inlet on the first mounting part.

[0011] Furthermore, the second piston connecting rod mechanism also includes a bearing disposed on the second connecting rod. One end of the second connecting rod is provided with a second mounting part, the second piston assembly is mounted on the second mounting part, and a bearing mounting hole is opened at the end of the second connecting rod away from the first mounting part, and the bearing is disposed in the bearing mounting hole.

[0012] Furthermore, a second connecting hole is also provided on the second connecting rod. The second connecting hole is located between the first mounting part and the bearing mounting hole, and the second connecting hole cooperates with the connecting assembly.

[0013] Furthermore, the second piston assembly includes a second piston and a second piston ring disposed on the side of the second piston, and the second piston has a receiving groove.

[0014] Furthermore, the connecting assembly includes a retaining pin and a needle roller bearing sleeved on the outside of the retaining pin.

[0015] To achieve the above objectives, the technical solution adopted by this utility model is to provide an air compressor, including the two-stage piston assembly provided by any of the above solutions.

[0016] The beneficial effects of this utility model are as follows: The first piston connecting rod mechanism of the dual-stage piston assembly of this utility model is an integrally formed rigid frame structure, and is rigidly connected to the second piston connecting rod mechanism through a connecting component, together forming a stable moving whole. This effectively avoids the cumulative errors caused by traditional decentralized parts assembly, ensuring the coaxiality and motion trajectory accuracy of the first and second piston assemblies in high-speed reciprocating motion, fundamentally reducing uneven wear and vibration, and greatly improving the operational stability and service life of the assembly. Both the first and second piston connecting rod mechanisms are pre-assembled independent modules, eliminating the need for tedious individual assembly of internal pistons, piston rings, valve plates, and other small parts during on-site assembly. Installation and calibration are significantly simplified; when vulnerable parts need to be replaced, the entire piston connecting rod mechanism can be easily removed from the compressor for maintenance, solving the pain points of complex disassembly and difficult calibration in traditional decentralized designs, reducing maintenance costs and time, and improving production efficiency; a fixed pin and needle roller bearing are used in combination, with the fixed pin achieving rigid transmission without gaps to ensure synchronized action; the needle roller bearing converts the sliding friction between the second connecting rod and the fixed pin into rolling friction, greatly reducing motion resistance, allowing the motor power to be converted into the reciprocating compression work of the piston more efficiently, reducing energy loss, improving the overall energy efficiency, and making the two-stage piston assembly run more smoothly and quietly. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the two-stage piston assembly of this utility model; Figure 2 This is a cross-sectional view of the two-stage piston assembly of this utility model; Figure 3 This is an exploded view of the two-stage piston assembly of this utility model; Figure 4 This is a schematic diagram of the structure of the first piston connecting rod mechanism of this utility model; Figure 5 This is a schematic diagram of the second piston connecting rod mechanism of this utility model.

[0019] The component names and their numbers in the diagram are as follows: Two-stage piston assembly 100; First piston-connecting rod mechanism 1, first connecting rod 11, first connecting hole 111, first mounting part 112, first air inlet 1121, first piston assembly 12, first piston 121, second air inlet 1211, first piston ring 122, first clamping part 1221, first side part 1222, one-way valve plate 123, fixing bolt 124. Second piston connecting rod mechanism 2, second connecting rod 21, bearing mounting hole 211, second mounting part 212, second connecting hole 213, second piston assembly 22, second piston 221, receiving groove 2211, second piston ring 222, second pressing part 2221, second side part 2222, bearing 23.

[0020] Connecting component 3, fixing pin 31, needle roller bearing 32. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0026] like Figure 1 , Figure 2 As shown, this embodiment provides a two-stage piston assembly 100, including an integrally formed first piston connecting rod mechanism 1, a second piston connecting rod mechanism 2 sleeved on the first piston connecting rod mechanism 1, and a connecting assembly 3 connecting the first piston connecting rod mechanism 1 and the second piston connecting rod mechanism 2. The first piston connecting rod mechanism 1 is used to cooperate with a cylinder to control the compression of gas; the second piston connecting rod mechanism 2 is used to cooperate with a cylinder to control the compression of gas; the connecting assembly 3 is used to precisely transmit the movement of the second piston connecting rod mechanism 2 to the first piston connecting rod mechanism 1, so that the first piston connecting rod mechanism 1 follows the second piston connecting rod mechanism 2 in a synchronous up-and-down reciprocating motion.

[0027] In some of these embodiments, such as Figure 4 As shown, the first piston-connecting rod mechanism 1 has a symmetrical structure along its central axis. The first piston-connecting rod mechanism 1 includes a first connecting rod 11 and a first piston assembly 12 disposed at the end of the first connecting rod 11. The first connecting rod 11 has a generally frame-like hollow structure, with symmetrical hollow cavities formed within it. The first connecting rod 11 is an integral rigid structure. One end of the first connecting rod 11 has a first mounting portion 112, the outer wheel of which is circular, and its outer diameter matches the diameter of the first compression cylinder (not shown) of the air compressor. The first mounting portion 112 has multiple first air inlets 1121. A first connecting hole 111 is provided on the first connecting rod 11 away from the first piston assembly 12. The first connecting hole 111 mates with a connecting assembly 3 for mounting the connecting assembly 3. One end of the first connecting rod 11 is connected to the first piston assembly 12 via the first mounting portion 112, and the other end of the first connecting rod 11 is connected to the connecting assembly 3 via the first connecting hole 111. The first connecting rod 11 is used to accurately transmit the motion of the second piston connecting rod mechanism 2 to the first piston assembly 12 through the connecting component 3, ensuring the up-and-down reciprocating motion of the first piston assembly 12, and at the same time providing rigid support for the first piston assembly 12.

[0028] In some of these embodiments, such as Figure 3As shown, the first piston assembly 12 is fixed to one end of the first connecting rod 11. The first piston assembly 12 includes a first piston 121, a first piston ring 122 disposed on the side of the first piston 121, a one-way valve plate 123 mounted on the first piston 121, and a fixing bolt 124. The first piston 121 is generally disc-shaped, and the diameter of the first piston 121 matches the diameter of the first mounting portion 112. A second air inlet 1211 is provided on the first piston 121, and the position of the second air inlet 1211 corresponds to the position of the first air inlet 1121 on the first mounting portion 12, thereby allowing external air to enter the other side of the first piston 121, that is, the inner cavity of the corresponding cylinder, through the first air inlet 1121 and the second air inlet 1212. The first piston ring 122 is made of rubber and includes a first clamping part 1221 and a first side part 1222. The first clamping part 1221 is annular, and the first side part 1222 mates with the side of the first piston 121. The first clamping part 1221 is pressed and fixed between the first piston 121 and the first mounting part 112, and the first side part 1222 fits against the outer surface of the first piston 121. Because the first piston ring 122 is made of rubber, the first piston assembly 12 is kept airtight when it moves within the first compression cylinder of the air compressor. A one-way valve 123 is installed on the side of the first piston 121 away from the first mounting part 112. Two one-way valves 123 are provided, and the one-way valves 123 are approximately Z-shaped. The two ends of the one-way valves 123 respectively cover the second air inlet 1211. Four fixing bolts 124 are provided. The four fixing bolts 124 pass through the one-way valve plate 123 and the first piston 121 in sequence and are fixed on the first mounting part 12. In this way, the one-way valve plate 123 is fixed on the first piston 121, the first pressing part 221 of the first piston ring 22 is pressed between the first piston 121 and the first mounting part 12, and the first piston 121 is fixed on the first mounting part 12, thereby realizing the fixing of the first piston assembly 12 on the first mounting part 12.

[0029] In some of these embodiments, such as Figure 5As shown, the second piston connecting rod mechanism 2 has a symmetrical structure along its central axis. The second piston connecting rod mechanism 2 includes a second connecting rod 21, a bearing 23 mounted on the second connecting rod 21, and a second piston assembly 22 located at the end of the second connecting rod 21. The second connecting rod 21 is a rigid, integrally formed structure. The end of the second connecting rod 21 away from the second piston assembly 22 is fitted into the hollow structure of the first connecting rod 11. One end of the second connecting rod 21 has a second mounting portion 212. The outer wheel of the second mounting portion 212 is circular, and the outer diameter of the second mounting portion 212 matches the diameter of the second compression cylinder of the air compressor (not shown in the figure). The second piston assembly 22 is mounted on the second mounting portion 212. A bearing mounting hole 211 is formed at the end of the second connecting rod 21 away from the first mounting portion 212, and the bearing 23 is disposed within the bearing mounting hole 211. A second connecting hole 213 is also provided on the second connecting rod 21. The second connecting hole 213 is located between the first mounting part 212 and the bearing mounting hole 211. The second connecting hole 211 cooperates with the connecting assembly 3 and is suitable for installing the connecting assembly 3. The second connecting rod 21 fixes the eccentric shaft (not shown in the figure) output by the drive mechanism to the bearing 23, thereby converting the circular rotational motion output by the drive mechanism into the up-and-down reciprocating motion of the bottom of the second piston assembly 22 of the second connecting rod 21, and then converting it into the up-and-down reciprocating motion of the first piston connecting rod mechanism 1 through the connecting assembly 3.

[0030] In some of these embodiments, such as Figure 3 As shown, the second piston assembly 22 is fixed to the second mounting portion 212. The second piston assembly 22 includes a second piston 221 and a second piston ring 222 disposed on the side of the second piston 221. A receiving groove 2211 is formed on the second piston 221. The receiving groove 2211 is a circular groove and is located on the top of the second piston 221. When the second piston assembly 3 moves within the second compression cylinder of the air compressor, the compressed gas can be collected in the receiving groove 2211. The second piston ring 222 is made of rubber and includes a second clamping part 2221 and a second side part 2222. The second clamping part 2221 is annular, and the second side part 2222 mates with the side of the second piston 221. The second piston 221 is pressed and fixed onto the second mounting part 212 by a press, and the second clamping part 2221 is pressed and fixed between the second piston 221 and the second mounting part 212. The second side part 2222 fits against the outer surface of the second piston 221. Because the second piston 221 is made of rubber, the airtightness of the second piston assembly 22 is ensured when it moves within the second compression cylinder of the air compressor.

[0031] In some of these embodiments, such as Figure 3As shown, the connecting assembly 3 includes a fixing pin 31 and a needle roller bearing 32 sleeved on the outside of the fixing pin 31. The diameter of the first connecting hole 111 matches the diameter of the fixing pin 31, and the diameter of the second connecting hole 111 matches the diameter of the needle roller bearing 32. The fixing pin 31 passes through the first connecting hole 111 on the first connecting rod 11 and the second connecting hole 213 on the second connecting rod 21. The needle roller bearing 31 is sleeved on the outside of the fixing pin 31 and is located within the second connecting hole 213 on the second connecting rod 21. The fixing pin 31 rigidly connects the first piston connecting rod mechanism 1 and the second piston connecting rod mechanism 2, realizing direct transmission of motion. It converts the annular rotational motion of the second connecting rod 21 into the up-and-down reciprocating motion of the first connecting rod 11, ensuring the synchronicity of the two-stage piston action, achieving high connection reliability, backlash-free transmission, and ensuring the accuracy of motion transmission. The needle roller bearing 32 is sleeved on the outside of the fixed pin 31 and located in the second connecting hole 213 of the second connecting rod 21. It converts the sliding friction between the second connecting rod 21 and the fixed pin 31 into rolling friction, which greatly reduces the motion resistance and makes the transmission between the rotational motion of the second connecting rod 21 and the reciprocating motion of the first connecting rod 11 smoother. The frictional resistance is small, the transmission efficiency is high, the energy loss is reduced, the overall efficiency of the two-stage compression is improved, the abnormal noise and vibration caused by friction are reduced, the service life is extended, and the operational stability of the two-stage piston assembly 100 is improved.

[0032] The working process of the two-stage piston assembly 100 of this utility model is as follows: the eccentric shaft output by the drive mechanism is fixedly connected to the bearing 23, driving the second piston connecting rod mechanism 2 to perform a circular rotational motion. Through the rigid transmission of the connecting piece 3, the rotational motion is converted into the up-and-down reciprocating motion of the first piston connecting rod mechanism 1, realizing the conversion of rotational to reciprocating motion form, ensuring that the first piston connecting rod mechanism 1 and the second piston connecting rod mechanism 2 move synchronously. Air enters the compressor cavity from the air inlet. When the first piston connecting rod mechanism 1 moves downward, the volume of the first-stage compression chamber increases, and gas is drawn in; when it moves upward, the volume of the first-stage compression chamber decreases, and the gas is initially compressed, and then enters the second-stage compression chamber through the internal air passage; when the first piston connecting rod mechanism 1 moves downward again, the volume of the second-stage compression chamber decreases, and the initially compressed gas is compressed a second time, so that the gas pressure is further increased; the high-pressure gas after the second-stage compression is finally delivered to the gas tank for storage, completing the entire compression cycle.

[0033] The first piston connecting rod mechanism 1 of the two-stage piston assembly 100 of this utility model is an integrally formed rigid frame structure, and is rigidly connected to the second piston connecting rod mechanism 2 through a connecting component 3, together forming a stable moving whole. This effectively avoids the cumulative errors caused by traditional decentralized parts assembly, ensuring the coaxiality and motion trajectory accuracy of the first piston assembly 12 and the second piston assembly 22 in high-speed reciprocating motion, fundamentally reducing uneven wear and vibration, and greatly improving the operational stability and service life of the assembly. Both the first piston connecting rod mechanism 1 and the second piston connecting rod mechanism 2 can be set as pre-assembled independent modules, eliminating the need for tedious individual installation and calibration of small parts such as internal pistons, piston rings, and valve plates during on-site assembly. The accuracy is greatly simplified; when it is necessary to replace vulnerable parts, only the entire piston connecting rod mechanism needs to be removed from the compressor for convenient maintenance, which solves the pain points of complex disassembly and difficult calibration in traditional decentralized designs, reduces maintenance costs and time, and improves production efficiency; the fixed pin 31 and the needle roller bearing 32 are used in conjunction, the fixed pin 31 achieves rigid transmission without gaps to ensure synchronous action; the needle roller bearing 32 converts the sliding friction between the second connecting rod 21 and the fixed pin 31 into rolling friction, which greatly reduces motion resistance, so that the motor power can be converted into the reciprocating compression work of the piston more efficiently, reducing energy loss, improving the overall energy efficiency, and making the two-stage piston assembly run more smoothly and quietly.

[0034] This utility model embodiment also provides an air compressor, which includes the two-stage piston assembly 100 provided in any of the above embodiments.

[0035] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0036] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A two-stage piston assembly for use in an air compressor, characterized in that, The device includes a first piston-link mechanism, a second piston-link mechanism sleeved on the first piston-link mechanism, and a connecting assembly connecting the first piston-link mechanism and the second piston-link mechanism. The first piston-link mechanism includes a first connecting rod and a first piston assembly disposed at the end of the first connecting rod. The first connecting rod has a frame-like hollow structure. The second piston-link mechanism includes a second connecting rod and a second piston assembly disposed at the end of the second connecting rod. The end of the second connecting rod away from the second piston assembly is sleeved in the hollow structure of the first connecting rod.

2. The two-stage piston assembly according to claim 1, characterized in that, One end of the first connecting rod is provided with a first mounting part, the outer wheel of the first mounting part is circular, and a first air inlet is provided on the first mounting part. One end of the first connecting rod is connected to the first piston assembly through the first mounting part.

3. The two-stage piston assembly according to claim 1, characterized in that, The first connecting rod has a first connecting hole located away from the first piston assembly. The first connecting hole cooperates with the connecting assembly, and the other end of the first connecting rod is connected to the connecting assembly through the first connecting hole.

4. The two-stage piston assembly according to claim 2, characterized in that, The first piston assembly includes a first piston, a first piston ring disposed on the side of the first piston, a one-way valve plate mounted on the first piston, and a fixing bolt.

5. The two-stage piston assembly according to claim 4, characterized in that, The first piston is disc-shaped, and its diameter matches the diameter of the first mounting part. A second air inlet is provided on the first piston, and the position of the second air inlet corresponds to the position of the first air inlet on the first mounting part.

6. The two-stage piston assembly according to claim 2, characterized in that, The second piston connecting rod mechanism also includes a bearing disposed on the second connecting rod. One end of the second connecting rod is provided with a second mounting part. The second piston assembly is mounted on the second mounting part. The end of the second connecting rod away from the first mounting part is provided with a bearing mounting hole, and the bearing is disposed in the bearing mounting hole.

7. The two-stage piston assembly according to claim 6, characterized in that, A second connecting hole is also provided on the second connecting rod. The second connecting hole is located between the first mounting part and the bearing mounting hole, and the second connecting hole cooperates with the connecting assembly.

8. The two-stage piston assembly according to claim 1, characterized in that, The second piston assembly includes a second piston and a second piston ring disposed on the side of the second piston, and the second piston has a receiving groove.

9. The two-stage piston assembly according to claim 1, characterized in that, The connecting assembly includes a retaining pin and a needle roller bearing sleeved on the outside of the retaining pin.

10. An air compressor, characterized in that: The air compressor includes the two-stage piston assembly as described in any one of claims 1 to 9.

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