Air pump, air suspension and vehicle

Abstract

The air pump comprises an air cylinder and a first piston assembly, the first piston assembly is movably installed in an inner cavity and divides the inner cavity into a first compression cavity and a movable cavity, and a driving part used for driving the first piston assembly to move is arranged in the movable cavity. The first piston assembly comprises a piston, a sleeve plug and an annular sealing piece, the piston is connected with the sleeve plug, the mounting part is connected between the piston and the sleeve plug, the sealing part is suitable for being in sealed abutting with the inner wall of the inner cavity, and the first compression cavity and the movable cavity are formed in the two sides of the sealing part; wherein a shape memory element is arranged in the sealing part. According to the air pump, the sealing performance of the air pump during operation can be guaranteed, the operation reliability of the driving part can be guaranteed, the service life of the driving part is prolonged, the setting cost is low, and the energy consumption can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle manufacturing, in particular to an air pump, an air suspension and a vehicle. Background Art

[0002] An air pump is a driven fluid machine that elevates low-pressure gas to high-pressure gas. Reciprocating air pumps can be used in the refrigeration and air-conditioning industries. The air pump is directly driven by an electric motor, causing the crankshaft to rotate, driving the connecting rod to move, and then causing the piston to reciprocate, causing the cylinder volume to change, thereby compressing the gas. The air pump is equipped with a sealing structure at the piston to ensure the sealing of the cylinder during the gas compression process. However, after the air pump is shut down, the inlet and exhaust valves are in a closed state, and the high-pressure gas trapped in the cylinder of the air pump cannot be discharged, resulting in excessive load on the motor when it is started next time, affecting the service life of the motor. Therefore, a motor with a large starting torque can be used or an exhaust solenoid valve can be added to release the trapped high-pressure gas in time. However, the installation cost is high and it will increase the energy consumption of the air pump, so there is room for improvement. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an air pump that can ensure the sealing performance while ensuring the reliability of the driving unit, extend the service life of the driving unit, and reduce the installation cost and energy consumption.

[0004] According to an embodiment of the present invention, the air pump includes: a cylinder and a first piston assembly, an inner cavity is formed in the cylinder, the first piston assembly can be movably installed in the inner cavity and divides the inner cavity into a first compression chamber and an active chamber, the cylinder is provided with a first air inlet and a first exhaust port respectively connected to the first compression chamber, the active chamber is provided with a driving part for driving the first piston assembly to move, the first piston assembly includes a piston, a sleeve plug and an annular seal, the annular seal includes a mounting part and a sealing part connected by bending, the piston is connected to the sleeve plug, the mounting part is connected between the piston and the sleeve plug, the sealing part is suitable for sealing and pressing against the inner wall of the inner cavity, the first compression chamber and the active chamber are formed on both sides of the sealing part; wherein, a shape memory element is provided in the sealing part.

[0005] According to the air pump of the embodiment of the present invention, a shape memory element is provided in the sealing part, so that the sealing part can ensure the sealing when the air pump is running, and can also relieve pressure when the air pump stops running, thereby ensuring the operating reliability of the driving part and extending the service life of the driving part. It has a simple structure, low installation cost, can reduce energy consumption, has better use effect, and has a wider range of applications.

[0006] According to the air pump of some embodiments of the present invention, the shape memory element is configured to drive the sealing portion to deform outward to press toward the inner wall of the inner cavity when the temperature rises, and to drive the sealing portion to deform inward to separate from the inner wall of the inner cavity when the temperature drops.

[0007] According to some embodiments of the air pump of the present invention, the mounting portion extends radially and circumferentially along the annular seal, the sealing portion is connected to the outer side of the mounting portion and extends axially along the annular seal relative to the mounting portion, and the sealing portion is suitable for deforming radially inward or outward along the annular seal under the deformation action of the shape memory element.

[0008] According to the air pump of some embodiments of the present invention, the shape memory element is configured in a ring shape, a wire shape, a strip shape, or a belt shape, and the shape memory element is extended along the circumference of the sealing portion.

[0009] According to the air pump of some embodiments of the present invention, there are a plurality of shape memory elements, and the plurality of shape memory elements are spaced apart and distributed in the sealing portion along the axial direction of the annular seal.

[0010] According to the air pump of some embodiments of the present invention, the sealing portion is bent and extended relative to the mounting portion toward a side away from the piston, and the sealing portion is sleeved outside the sleeve plug and is suitable for deforming in a direction away from or close to the sleeve plug.

[0011] According to the air pump of some embodiments of the present invention, an arc-shaped transition section is formed between the sealing portion and the mounting portion, and the sealing portion and the mounting portion are respectively smoothly connected to the arc-shaped transition section.

[0012] According to the air pump of some embodiments of the present invention, the sleeve plug includes a clamping shaft segment and a connecting shaft segment connected along the axial direction, and the outer diameter of the clamping shaft segment is larger than the outer diameter of the connecting shaft segment; a connecting shaft hole is formed at one end of the piston, and the clamping shaft segment is interference fit into the connecting shaft hole, and the mounting portion is clamped between the end face of the clamping shaft segment and the end face of one end of the piston.

[0013] According to the air pump of some embodiments of the present invention, the mounting portion is constructed in the shape of an annular sheet, and the mounting portion is sleeved outside the connecting shaft segment.

[0014] According to the air pump of some embodiments of the present invention, the shape memory element is configured as a shape memory alloy wire, and the number of the shape memory alloy wires is N, and satisfies: 1≤N≤3.

[0015] According to the air pump of some embodiments of the present invention, the sealing portion is configured to have an interference fit with the inner wall of the inner cavity of 2%-5% after the shape memory element expands and deforms outward.

[0016] According to some embodiments of the present invention, the air pump further includes a second piston assembly, which is movably mounted in the inner cavity and defines a second compression chamber with the cylinder. The cylinder is provided with a second air inlet and a second exhaust port respectively connected to the second compression chamber. The second piston assembly is used to compress the gas in the second compression chamber, and the first compression chamber is selectively connected to the second compression chamber.

[0017] The utility model also provides an air suspension.

[0018] The air suspension according to the embodiment of the present invention is provided with any of the air pumps described above.

[0019] The utility model also provides a vehicle.

[0020] According to an embodiment of the present invention, a vehicle is provided with any one of the above-mentioned air pumps or the above-mentioned air suspension.

[0021] The advantages of the air suspension, the vehicle and the exhaust assembly described above over the prior art are the same and will not be described in detail here.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 This is a partial cross-sectional view of an air pump according to an embodiment of the present utility model. Figure 1 ;

[0025] Figure 2 This is a partial cross-sectional view of an air pump according to an embodiment of the present utility model. Figure 2 ;

[0026] Figure 3 This is a partial cross-sectional view of an air pump according to an embodiment of the present utility model. Figure 3 ;

[0027] Figure 4 is a partial cross-sectional view of an annular seal according to an embodiment of the present utility model;

[0028] Figure 5This is a partial cross-sectional view of an air pump according to an embodiment of the present utility model. Figure 4 .

[0029] Reference numerals:

[0030] Air pump 100,

[0031] Cylinder 1, first compression chamber 11, first air inlet 111, air inlet valve plate 1111, first exhaust port 112, exhaust valve plate 1121, active chamber 12, second compression chamber 13, first piston assembly 2, piston 21, connecting shaft hole 211, sleeve plug 22, clamping shaft section 221, connecting shaft section 222, annular seal 23, mounting portion 231, arc-shaped transition section 232, sealing portion 233, shape memory element 234, second piston assembly 3. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] Reference below Figure 1-Figure 5 The air pump 100 according to the embodiment of the present invention can ensure the sealing performance while ensuring the reliability of the driving part, extend the service life of the driving part, and reduce the installation cost and energy consumption.

[0036] like Figure 1-Figure 5 As shown, an air pump 100 according to an embodiment of the present invention includes: a cylinder 1 and a first piston assembly 2 .

[0037] An inner cavity is formed in the cylinder 1, and the first piston assembly 2 can be movably installed in the inner cavity and divides the inner cavity into a first compression chamber 11 and an active chamber 12. The cylinder 1 is provided with a first air inlet 111 and a first exhaust port 112 respectively connected to the first compression chamber 11, and the active chamber 12 is provided with a driving part for driving the first piston assembly 2 to move. The first piston assembly 2 includes a piston 21, a sleeve plug 22 and an annular seal 23. The annular seal 23 includes a mounting part 231 and a sealing part 233 connected by bending. The piston 21 is connected to the sleeve plug 22, and the mounting part 231 is connected between the piston 21 and the sleeve plug 22. The sealing part 233 is suitable for sealing and pressing against the inner wall of the inner cavity. The first compression chamber 11 and the active chamber 12 are formed on both sides of the sealing part 233, wherein a shape memory element 234 is provided in the sealing part 233.

[0038] Among them, the air pump 100, also known as an air compressor, air handling device or air compression unit, is a driven fluid machine that lifts low-pressure gas into high-pressure gas. Reciprocating air pumps 100 can be used in the refrigeration and air-conditioning industries. The air pump 100 is directly driven by an electric motor to rotate the crankshaft, drive the connecting rod to move, and then make the piston 21 reciprocate, causing the volume of the cylinder 1 to change, and then the gas can be compressed. It has a wide range of applications and good use effects.

[0039] Specifically, the air pump 100 is provided with a cylinder 1. In actual use, the cylinder 1 can be composed of three parts, namely, a cylinder head, a cylinder body and a cylinder seat, or two parts, namely, a cylinder head and a cylinder body, according to usage requirements. A cavity, namely, an inner cavity, is formed in the cylinder 1. The inner cavity is provided with a first compression chamber 11 and an active chamber 12. A first piston assembly 2 is provided in the air pump 100, namely, the first piston assembly 2 is arranged in the inner cavity. The first piston assembly 2 can be arranged between the first compression chamber 11 and the active chamber 12, thereby separating the inner cavity. The first piston assembly 2 is movable relative to the inner cavity, so that when the first piston assembly 2 moves relative to the inner cavity, the volumes of the first compression chamber 11 and the active chamber 12 can change relatively. When the volume of the first compression chamber 11 increases, the volume of the active chamber 12 decreases. Conversely, when the volume of the first compression chamber 11 decreases, the volume of the active chamber 12 increases.

[0040] The cylinder 1 is provided with a first air inlet 111 and a first exhaust port 112. The first air inlet 111 and the first exhaust port 112 are both connected to the first compression chamber 11, so that gas can enter the first compression chamber 11 from the first air inlet 111 for compression, and the compressed gas can be discharged from the first exhaust port 112 to store the compressed gas. A driving part is also provided in the movable chamber 12, and the driving part is power-connected to the first piston assembly 2. The driving part can be set as a driving motor, etc. The driving part can drive the first piston assembly 2 to move relative to the inner cavity, so that the first piston assembly 2 can compress the gas in the first compression chamber 11 to meet the use requirements.

[0041] Furthermore, the first piston assembly 2 is provided with a piston 21, a sleeve plug 22 and an annular seal 23. The piston 21 is connected to the driving part, the sleeve plug 22 is connected to the piston 21, and the annular seal 23 is arranged between the piston 21 and the sleeve plug 22, so that the driving part can drive the piston 21, the sleeve plug 22 and the annular seal 23 to move relative to the inner cavity. The annular seal 23 can be set to a material such as polytetrafluoroethylene, and the annular seal 23 is provided with a bent mounting portion 231 and a sealing portion 233. The mounting portion 231 is arranged between the piston 21 and the sleeve plug 22, and the sealing portion 233 can be sealed and pressed against the inner wall of the inner cavity. The first compression chamber 11 and the active chamber 12 are formed on both sides of the sealing portion 233, so that the sealing portion 233 can seal between the first compression chamber 11 and the active chamber 12 to ensure the reliability of gas compression.

[0042] Among them, a shape memory element 234 is also provided in the sealing part 233. The shape memory element 234 can be set to a shape memory alloy, that is, the shape memory element 234 can be deformed under specific conditions and can restore its original shape. The specific conditions can refer to conditions such as temperature. When the first piston assembly 2 moves relative to the inner cavity under the drive of the driving part, the shape memory element 234 can be deformed, so that the sealing part 233 can be pressed toward the inner wall of the inner cavity, ensuring the reliability of the sealing between the first compression chamber 11 and the active chamber 12 by the sealing part 233, and when the first piston assembly 2 stops moving, the shape memory element 234 in the sealing part 233 can drive the sealing part 233 to deform inward, so that the high-pressure gas retained in the cylinder 1 can be discharged through the gap between the sealing part 233 and the inner wall of the inner cavity, so as to relieve the pressure inside the air pump 100 and ensure the reliability of the operation of the driving part.

[0043] According to the air pump 100 of the embodiment of the present invention, a shape memory element 234 is provided in the sealing portion 233, so that the sealing portion 233 can ensure the sealing performance of the air pump 100 when it is in operation, and can also relieve pressure when the air pump 100 stops running, thereby ensuring the operational reliability of the driving portion and extending the service life of the driving portion. The structure is simple, the setting cost is low, the energy consumption can be reduced, the use effect is better, and the scope of application is wider.

[0044] In some embodiments, the shape memory element 234 is configured to drive the sealing portion 233 to deform outward to press against the inner wall of the inner cavity when the temperature rises, and to drive the sealing portion 233 to deform inward to separate from the inner wall of the inner cavity when the temperature drops.

[0045] Specifically, a shape memory element 234 is also provided in the sealing part 233. The shape memory element 234 can be set to a shape memory alloy, etc. When the first piston assembly 2 moves relative to the inner cavity under the drive of the driving part, there is friction between the sealing part 233 and the inner wall of the inner cavity, which causes the temperature to rise. At this time, the shape memory element 234 can drive the sealing part 233 to deform outward in the sealing part 233, so that the sealing part 233 can be pressed toward the inner wall of the inner cavity, ensuring the reliability of the sealing part 233 between the first compression chamber 11 and the active chamber 12, and when the first piston assembly 2 stops moving, the temperature of the sealing part 233 decreases. At this time, the shape memory element 234 in the sealing part 233 can drive the sealing part 233 to deform inward, so that the sealing part 233 can be separated from the inner wall of the inner cavity, so that the high-pressure gas retained in the cylinder 1 can be discharged through the gap between the sealing part 233 and the inner wall of the inner cavity, so as to relieve the pressure inside the air pump 100 and ensure the reliability of the operation of the driving part.

[0046] In some embodiments, the mounting portion 231 extends radially and circumferentially of the annular seal 23, the sealing portion 233 is connected to the outer side of the mounting portion 231 and extends axially of the annular seal 23 relative to the mounting portion 231, and the sealing portion 233 is suitable for deforming radially inward or outward along the annular seal 23 under the deformation action of the shape memory element 234.

[0047] Specifically, the annular seal 23 is provided with a mounting portion 231 and a sealing portion 233 connected by bending. The sealing portion 233 can be sealed against the inner wall of the inner cavity to ensure the reliability of gas compression. The mounting portion 231 is provided between the piston 21 and the sleeve plug 22, and the mounting portion 231 is provided to extend along the radial and circumferential directions of the annular seal 23, and the sealing portion 233 is connected to the outer side of the mounting portion 231, that is, Figure 4 As shown, the sealing portion 233 is arranged on the outside of the mounting portion 231 and around the mounting portion 231. The mounting portion 231 and the sealing portion 233 are connected by bending, and the mounting portion 231 extends along the axial direction of the annular seal 23, that is, the mounting portion 231 can be extended axially between the inner wall of the inner cavity and the outer wall of the first piston assembly 2, so that the mounting portion 231 can be extended toward the first compression chamber 11, and can also be extended toward the active chamber 12.

[0048] Furthermore, if Figure 3As shown, in this embodiment, the mounting portion 231 can be extended toward the first compression chamber 11, thereby preventing the gas in the first compression chamber 11 from leaking into the active chamber 12 during the compression process, thereby ensuring the reliability of gas compression, and the sealing portion 233 can be deformed radially inward along the annular seal 23 under the deformation action of the shape memory element 234, and can also be deformed radially outward along the annular seal 23 under the deformation action of the shape memory element 234, thereby allowing the sealing portion 233 to be pressed toward the inner wall of the inner cavity, and also to be separated from the inner wall of the inner cavity, thereby meeting the sealing performance in the cylinder 1 and avoiding the high-pressure gas retained in the cylinder 1, thereby extending the service life of the drive portion.

[0049] In some embodiments, the shape memory element 234 is configured in a ring shape, a wire shape, a strip shape, or a ribbon shape, and the shape memory element 234 is extended along the circumference of the sealing portion 233 .

[0050] Specifically, a shape memory element 234 is provided in the sealing portion 233. The shape memory element 234 can be set to a shape memory alloy, etc. When the temperature rises, the shape memory element 234 can drive the sealing portion 233 to deform outward to press against the inner wall of the inner cavity to ensure sealing reliability, and when the temperature drops, the shape memory element 234 can drive the sealing portion 233 to deform inward to separate from the inner wall of the inner cavity, thereby discharging the high-pressure gas in the cylinder 1, and the shape memory element 234 can be constructed in a ring, wire, strip or belt shape, such as Figure 4 As shown, in this embodiment, the shape memory element 234 is constructed in an annular shape, and the shape memory element 234 is extended along the circumference of the sealing portion 233. The sealing portion 233 is arranged on the outside of the mounting portion 231 and is arranged around the mounting portion 231. The shape memory element 234 is extended along the circumference of the sealing portion 233, that is, the shape memory element 234 can be arranged around the mounting portion 231, so that each part of the sealing portion 233 along the circumference can be close to or away from the inner wall of the inner cavity, thereby improving the reliability of the sealing portion 233.

[0051] In some embodiments, there are a plurality of shape memory elements 234 , and the plurality of shape memory elements 234 are spaced apart and distributed along the axial direction of the annular seal 23 within the sealing portion 233 .

[0052] Specifically, the shape memory element 234 is provided in the sealing portion 233 and can be provided in a ring shape or a strip shape, etc., thereby driving the sealing portion 233 at various locations in the circumferential direction to approach or move away from the inner wall of the inner cavity, thereby ensuring the operational reliability of the air pump 100. The shape memory element 234 can be provided in a plurality, that is, the shape memory element 234 can be provided in two, three or more shapes. In this embodiment, as Figure 4As shown, two shape memory elements 234 are provided. In actual use, a corresponding number of shape memory elements 234 can be selected according to the extension length of the sealing portion 233, etc., so as to improve the setting flexibility, and multiple shape memory elements 234 are distributed in the sealing portion 233 along the axial direction of the annular seal 23, that is, multiple shape memory elements 234 are provided in the axial direction inside the sealing portion 233, and the multiple shape memory elements 234 can jointly drive the sealing portion 233 to move, thereby ensuring its operational reliability.

[0053] In some embodiments, the sealing portion 233 bends and extends relative to the mounting portion 231 toward a side away from the piston 21 . The sealing portion 233 is sleeved outside the sleeve plug 22 and is adapted to deform in a direction away from or toward the sleeve plug 22 .

[0054] Specifically, the mounting portion 231 of the annular seal 23 is arranged between the piston 21 and the sleeve plug 22, the sealing portion 233 is arranged on the outside of the mounting portion 231, and is located between the first piston assembly 2 and the inner wall of the inner cavity, the sealing portion 233 is extended along the axial direction of the first piston assembly 2, and is bent and extended relative to the mounting portion 231 toward the side away from the piston 21, that is, the sealing portion 233 is extended axially toward the side of the sleeve plug 22, so that the sealing portion 233 can be sleeved on the outside of the sleeve plug 22, that is, the sealing portion 233 is arranged between the outer wall of the sleeve plug 22 and the inner wall of the inner cavity.

[0055] Moreover, the sealing portion 233 can be deformed in a direction away from or close to the sleeve plug 22 under the action of the shape memory element 234. When the shape memory element 234 drives the sealing portion 233 to deform in a direction away from the sleeve plug 22, the sealing portion 233 can be pressed against the inner wall of the inner cavity, thereby sealing the first compression chamber 11. When the shape memory element 234 drives the sealing portion 233 to deform in a direction close to the sleeve plug 22, a gap may exist between the sealing portion 233 and the inner wall of the inner cavity, so that the high-pressure gas can be discharged from the cylinder 1, thereby ensuring the operational reliability of the air pump 100.

[0056] In some embodiments, an arcuate transition section 232 is formed between the sealing portion 233 and the mounting portion 231, and the sealing portion 233 and the mounting portion 231 are smoothly connected to the arcuate transition section 232 respectively. The annular seal 23 is provided with a sealing portion 233 and a mounting portion 231 connected by a bending, the mounting portion 231 is provided between the piston 21 and the sleeve plug 22, and the sealing portion 233 is provided between the outer wall of the sleeve plug 22 and the inner wall of the inner cavity. The sealing portion 233 and the mounting portion 231 can be connected through the arcuate transition section 232, and the sealing portion 233 and the mounting portion 231 are smoothly connected to the arcuate transition section 232 respectively, that is, a smooth curved surface can be formed inside the annular seal 23, and the sealing portion 233 can move relative to the mounting portion 231 under the drive of the shape memory element 234. The provision of the arcuate transition section 232 can avoid stress concentration at the connection between the sealing portion 233 and the mounting portion 231, which may cause the connection between the sealing portion 233 and the mounting portion 231 to be easily broken, thereby extending the service life of the annular seal 23.

[0057] In some embodiments, the sleeve plug 22 includes a clamping shaft segment 221 and a connecting shaft segment 222 connected along the axial direction, and the outer diameter of the clamping shaft segment 221 is larger than the outer diameter of the connecting shaft segment 222; a connecting shaft hole 211 is formed at one end of the piston 21, and the clamping shaft segment 221 is interference fit into the connecting shaft hole 211, and the mounting portion 231 is clamped between the end face of the clamping shaft segment 221 and the end face of one end of the piston 21.

[0058] Specifically, if Figure 1-3 As shown, the first piston assembly 2 is provided with a piston 21, a sleeve plug 22 and an annular seal 23. The piston 21 and the sleeve plug 22 are connected. The sleeve plug 22 is connected to the side of the piston 21 close to the first compression chamber 11. The mounting portion 231 of the annular seal 23 is provided between the piston 21 and the sleeve plug 22, so that the driving portion can drive the first piston assembly 2 to move as a whole in the inner cavity, and as shown in FIG. Figure 3 As shown, the sleeve plug 22 is provided with a clamping shaft section 221 and a connecting shaft section 222. The clamping shaft section 221 and the connecting shaft section 222 are connected along the axial direction. The connecting shaft section 222 is connected to the side of the clamping shaft section 221 close to the piston 21, that is, the connecting shaft section 222 is arranged close to the piston 21, and the clamping shaft section 221 is arranged away from the piston 21.

[0059] Furthermore, the piston 21 is provided with a connecting shaft hole 211, which is open toward the side of the first compression chamber 11, and the sleeve plug 22 is provided on the side of the piston 21 close to the first compression chamber 11. The connecting shaft section 222 of the sleeve plug 22 can extend into the connecting shaft hole 211 and is interference-fitted with the connecting shaft hole 211, thereby ensuring the reliability of the connection between the sleeve plug 22 and the piston 21, and the outer diameter of the clamping shaft section 221 of the sleeve plug 22 is larger than the outer diameter of the connecting shaft section 222, so that after the connecting shaft section 222 is inserted into the connecting shaft hole 211, the clamping shaft section 221 can be pressed against the end face of the connecting shaft hole 211 of the piston 21, and the mounting portion 231 of the annular seal 23 can be clamped between the end face of the clamping shaft section 221 and the end face of one end of the piston 21, so that after the sleeve plug 22 is interference-fitted with the piston 21, the mounting portion 231 can be fixed, and the installation is simple and the reliability is high.

[0060] In some embodiments, the mounting portion 231 is constructed in the shape of an annular sheet, and the mounting portion 231 is sleeved outside the connecting shaft section 222 .

[0061] Specifically, if Figure 4 As shown, the annular seal 23 is provided with a bent and connected mounting portion 231 and a sealing portion 233. The sealing portion 233 can be sealed and pressed against the inner wall of the inner cavity to ensure the reliability of gas compression. The mounting portion 231 is arranged between the piston 21 and the sleeve plug 22, and the mounting portion 231 is arranged to extend radially and circumferentially along the annular seal 23, that is, the mounting portion 231 can be constructed as an annular sheet, and the connecting shaft section 222 of the sleeve plug 22 extends into the connecting shaft hole 211, so that the sleeve plug 22 and the piston 21 are connected, and the mounting portion 231 is arranged between the end face of the clamping shaft section 221 and the end face of one end of the piston 21, that is, the mounting portion 231 can be sleeved outside the connecting shaft section 222, so that the connecting shaft section 222 can limit the mounting portion 231 in the radial direction to ensure installation reliability, and the sealing portion 233 is connected to the outside of the mounting portion 231, thereby ensuring the sealing of the sealing portion 233 at all locations in the circumferential direction, thereby improving the sealing reliability.

[0062] In some embodiments, the shape memory element 234 is configured as a shape memory alloy wire, and the number of the shape memory alloy wires is N, and the following condition is satisfied: 1≤N≤3.

[0063] Specifically, the shape memory element 234 is provided in the sealing portion 233 and can be constructed as a shape memory alloy wire, etc., which can drive the sealing portion 233 circumferentially close to or away from the inner wall of the inner cavity to ensure the reliability of the operation of the air pump 100. The number of shape memory alloy wires is set to N and satisfies: 1≤N≤3, that is, the number N of shape memory elements 234 can be set to 1, 2 or 3. In this embodiment, Figure 4As shown, the number of shape memory elements 234 is set to 2, and the two shape memory elements 234 are distributed axially spaced apart in the sealing portion 233 along the first piston assembly 2, so that the two shape memory elements 234 can jointly drive the sealing portion 233 to move, ensuring its operational reliability.

[0064] And as Figure 5 As shown, the radial dimensions of the two shape memory elements 234 can be set to be different, and the radial dimension of the shape memory element 234 close to the mounting portion 231 can be set to be smaller than the radial dimension of the shape memory element 234 away from the mounting portion 231, thereby making the distance between the end of the sealing portion 233 away from the mounting portion 231 and the inner wall of the inner cavity smaller than the distance between the end of the sealing portion 233 close to the mounting portion 231 and the inner wall of the inner cavity, thereby making it easier for the end of the sealing portion 233 away from the mounting portion 231 to abut against the inner wall of the inner cavity, thereby ensuring the sealing reliability.

[0065] In some embodiments, the first air inlet 111 is provided with an air inlet valve plate 1111, which is used to selectively open or close the first air inlet 111; and / or, the first exhaust port 112 is provided with an exhaust valve plate 1121, which is used to selectively open or close the first exhaust port 112.

[0066] Specifically, if Figure 2 As shown, the cylinder 1 is provided with a first air inlet 111 and a first exhaust port 112. The first air inlet 111 and the first exhaust port 112 are both connected to the first compression chamber 11 of the compression chamber, so that the gas can enter the first compression chamber 11 of the compression chamber from the first air inlet 111 for compression, and the compressed gas can be discharged from the first exhaust port 112 to store the compressed gas.

[0067] Furthermore, the first air inlet 111 is provided with an air inlet valve plate 1111, which can selectively open or close the first air inlet 111, that is, when the piston 21 is away from the first compression chamber 11 of the compression chamber, the air inlet valve plate 1111 opens the first air inlet 111 of the air inlet, thereby allowing gas to be transported to the first compression chamber 11 of the compression chamber, and when the piston 21 moves toward the first compression chamber 11 of the compression chamber, the air inlet valve plate 1111 closes the first air inlet 111 of the air inlet, so that the piston 21 can compress the gas in the first compression chamber 11 of the compression chamber, thereby ensuring the reliability of gas compression, and the first exhaust port 112 is provided with an exhaust valve plate 1121, and the exhaust valve plate 1121 The first exhaust port 112 of the exhaust port can be selectively opened or closed, that is, when the piston 21 is away from the first compression chamber 11 of the compression chamber, the exhaust valve plate 1121 closes the first exhaust port 112 of the exhaust port, and the gas can enter the first compression chamber 11 of the compression chamber through the first air inlet 111, and when the gas is compressed, the exhaust valve plate 1121 can also close the first exhaust port 112 of the exhaust port to ensure the reliability of gas compression. After the gas compression is completed, the exhaust valve plate 1121 opens the first exhaust port 112 of the exhaust port, so that the compressed gas in the first compression chamber 11 of the compression chamber can be discharged from the first exhaust port 112 of the exhaust port to the first compression chamber 11 of the compression chamber, so as to store the compressed gas and meet the use requirements.

[0068] In some embodiments, the sealing portion 233 is configured to have an interference fit with the inner wall of the inner cavity of 2%-5% after the shape memory element 234 expands and deforms outward.

[0069] Specifically, the annular seal 23 is provided with a mounting portion 231 and a sealing portion 233. The sealing portion 233 is provided between the outer wall of the sleeve plug 22 and the inner wall of the inner cavity, and a shape memory element 234 is provided in the sealing portion 233. When the temperature rises, the shape memory element 234 can drive the sealing portion 233 to expand and deform outward, thereby causing the sealing portion 233 to be pressed toward the inner wall of the inner cavity. When the temperature drops, the shape memory element 234 can drive the sealing portion 233 to deform inward, thereby causing the sealing portion 233 to be pressed against the inner wall of the inner cavity. The sealing portion 233 can be separated from the inner wall of the inner cavity, and the interference fit between the sealing portion 233 and the inner wall of the inner cavity after the shape memory element 234 is deformed outward is 2%-5%. That is, when the temperature rises, the shape memory element 234 can drive the sealing portion 233 to be pressed toward the inner wall of the inner cavity, so that the sealing portion 233 has an interference fit with the inner wall of the inner cavity, thereby improving the sealing performance of the sealing portion 233 to the first compression chamber 11, thereby improving the pumping capacity of the piston 21 and improving the efficiency of the air pump 100.

[0070] Among them, the phase change temperature of the shape memory element 234 can be trained and prepared according to actual usage requirements. For example, the starting temperature of the phase change is 50°C and the ending temperature is 80°C, which means that when the dry friction between the sealing part 233 and the inner wall of the inner cavity causes the temperature to rise to 50°C, the shape memory element 234 begins to expand, and reaches the maximum expansion amount at 80°C, thereby adapting to the interference and sealing requirements under high temperature and high pressure environments; when the shutdown temperature naturally drops below 50°C, the sealing part 233 and the cylinder 1 wall resume transition fit, and the high-pressure gas opens the sealing part 233 to achieve pressure relief and exhaust. By releasing the pressure and reducing the dry friction, the load of the drive part during the next cold start can be reduced, thereby ensuring operational reliability.

[0071] In some embodiments, the air pump 100 also includes a second piston assembly 3, which is movably mounted in the inner cavity and defines a second compression chamber 13 with the cylinder 1. The cylinder 1 is provided with a second air inlet and a second exhaust port respectively connected to the second compression chamber 13. The second piston assembly 3 is used to compress the gas in the second compression chamber 13, and the first compression chamber 11 is selectively connected to the second compression chamber 13.

[0072] Specifically, the air pump 100 is provided with a cylinder 1. In actual use, the cylinder 1 can be composed of three parts, namely a cylinder head, a cylinder body and a cylinder seat, or two parts, namely a cylinder head and a cylinder body, according to usage requirements. A cavity is formed in the cylinder 1, namely an inner cavity, and the inner cavity can be provided with a second compression chamber 13. A second piston assembly 3 is provided in the air pump 100, namely the second piston assembly 3 is provided in the inner cavity, and the second piston assembly 3 is movable relative to the inner cavity, so that when the second piston assembly 3 moves relative to the inner cavity, the volume of the second compression chamber 13 can change.

[0073] Furthermore, the cylinder 1 is provided with a second air inlet and a second exhaust port, and the second air inlet and the second exhaust port are both connected to the second compression chamber 13, so that gas can enter the second compression chamber 13 from the second air inlet for compression, and the compressed gas can be discharged from the second exhaust port to store the compressed gas, and the driving part can be dynamically connected to the second piston assembly 3, and the driving part can be set to a driving motor, etc. The driving part can drive the second piston assembly 3 to move relative to the inner cavity, so that the second piston assembly 3 can compress the gas in the second compression chamber 13 to meet the use requirements, and the first piston assembly 2 and the second piston assembly 3 are both driven by the same driving part. When the driving part drives the first piston assembly 2 to move, the first piston assembly 2 drives the second piston assembly 3 to move.

[0074] The first compression chamber 11 and the second compression chamber 13 are selectively connected, that is, when the first compression chamber 11 and the second compression chamber 13 are connected, the gas in the first compression chamber 11 can flow from the first compression chamber 11 to the second compression chamber 13 for further compression, and the compressed gas can be discharged from the second gas outlet, thereby realizing continuous compression of the gas, and finally achieving the required high-temperature and high-pressure gas, thereby improving the gas compression efficiency.

[0075] The utility model also provides an air suspension.

[0076] The air suspension according to the embodiment of the present invention is provided with any one of the above-mentioned air pumps 100 .

[0077] According to the air suspension of the embodiment of the present invention, an air pump 100 is provided. The air pump 100 sets a shape memory element 234 in the sealing part 233, so that when the temperature rises, the sealing part 233 can be deformed outward to press toward the inner wall of the inner cavity, and when the temperature drops, the sealing part 233 can be deformed inward to separate from the inner wall of the inner cavity. This can ensure the sealing of the air pump 100 when it is running, and can also relieve pressure when the air pump 100 stops running, thereby ensuring the operating reliability of the drive part and extending the service life of the drive part. In addition, the air pump 100 has a simple structure, low installation cost, can reduce energy consumption, has better use effect, and has a wider range of applications.

[0078] The utility model also provides a vehicle.

[0079] The vehicle according to the embodiment of the present invention is provided with any one of the above-mentioned air pumps 100 or the above-mentioned air suspension.

[0080] According to the vehicle of the embodiment of the present invention, an air suspension is provided with an air pump 100, and the air pump 100 sets a shape memory element 234 in the sealing part 233, so that when the temperature rises, the sealing part 233 can be deformed outward to press toward the inner wall of the inner cavity, and when the temperature drops, the sealing part 233 can be deformed inward to separate from the inner wall of the inner cavity. This can ensure the sealing of the air pump 100 when it is running, and can also relieve pressure when the air pump 100 stops running, thereby ensuring the operating reliability of the drive part and extending the service life of the drive part. In addition, the structure is simple, the installation cost is low, the energy consumption can be reduced, the use effect is better, and the scope of application is wider.

[0081] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0082] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air pump, characterized in that: include: A cylinder and a first piston assembly, wherein an inner cavity is formed in the cylinder, and the first piston assembly is movably mounted in the inner cavity and divides the inner cavity into a first compression chamber and a movable chamber. The cylinder is provided with a first air inlet and a first exhaust port respectively connected to the first compression chamber. A driving portion for driving the first piston assembly to move is provided in the movable chamber. The first piston assembly includes a piston, a sleeve plug and an annular seal. The annular seal includes a mounting portion and a sealing portion that are bent and connected. The piston is connected to the sleeve plug, the mounting portion is connected between the piston and the sleeve plug, and the sealing portion is suitable for sealing and pressing against the inner wall of the inner cavity. The first compression chamber and the movable chamber are formed on both sides of the sealing portion. Wherein, a shape memory element is provided in the sealing portion.

2. The air pump according to claim 1, characterized in that The shape memory element is configured to drive the sealing portion to deform outward to press against the inner wall of the inner cavity when the temperature rises, and to drive the sealing portion to deform inward to separate from the inner wall of the inner cavity when the temperature drops.

3. The air pump according to claim 1 or 2, characterized in that: The mounting portion extends radially and circumferentially along the annular seal, the sealing portion is connected to the outer side of the mounting portion and extends in an axial direction of the annular seal relative to the mounting portion, and the sealing portion is suitable for deforming radially inward or outward along the annular seal under the deformation action of the shape memory element.

4. The air pump according to claim 3, characterized in that The shape memory element is configured in a ring shape, a wire shape, a strip shape, or a belt shape, and the shape memory element is extended along the circumference of the sealing portion.

5. The air pump according to claim 3, characterized in that There are a plurality of shape memory elements, and the plurality of shape memory elements are spaced apart and distributed in the sealing portion along the axial direction of the annular seal.

6. The air pump according to claim 3, characterized in that The sealing portion is bent and extended relative to the mounting portion toward a side away from the piston. The sealing portion is sleeved outside the sleeve plug and is suitable for deforming in a direction away from or close to the sleeve plug.

7. The air pump according to claim 3, characterized in that An arc-shaped transition section is formed between the sealing portion and the mounting portion, and the sealing portion and the mounting portion are respectively smoothly connected to the arc-shaped transition section.

8. The air pump according to claim 1 or 2, characterized in that: The sleeve plug comprises a clamping shaft section and a connecting shaft section connected in the axial direction, wherein the outer diameter of the clamping shaft section is larger than the outer diameter of the connecting shaft section; A connecting shaft hole is formed at one end of the piston, the clamping shaft section is interference-fitted into the connecting shaft hole, and the mounting portion is clamped between the end face of the clamping shaft section and the end face of one end of the piston.

9. The air pump according to claim 8, characterized in that The mounting portion is constructed in the shape of an annular sheet and is sleeved outside the connecting shaft section.

10. The air pump according to claim 1 or 2, characterized in that: The shape memory element is configured as a shape memory alloy wire, and the number of the shape memory alloy wires is N, and the relationship 1≤N≤3 is satisfied.

11. The air pump according to claim 1 or 2, characterized in that: The sealing portion is configured to have an interference fit of 2% to 5% with the inner wall of the inner cavity after the shape memory element expands and deforms outward.

12. The air pump according to claim 1 or 2, characterized in that: It also includes a second piston assembly, which is movably mounted in the inner cavity and defines a second compression chamber with the cylinder. The cylinder is provided with a second air inlet and a second air outlet respectively connected to the second compression chamber. The second piston assembly is used to compress the gas in the second compression chamber, and the first compression chamber is selectively connected to the second compression chamber.

13. An air suspension, characterized in that: An air pump according to any one of claims 1 to 12 is provided.

14. A vehicle, characterized in that: An air pump according to any one of claims 1 to 12 or an air suspension according to claim 13 is provided.

Images