Piston drive mechanism and air pump device

Abstract

Embodiments of the present application provide a piston driving mechanism and a gas pump device. The piston driving mechanism comprises a piston cylinder, a piston and a driving motor. The piston is movably arranged in the piston cylinder. The driving motor comprises a first cover body, a barrel, a second cover body and a motor body. The first cover body and the second cover body are respectively located at two opposite ends of the barrel. The first cover body, the barrel and the second cover body cooperatively form a mounting cavity. The first cover body is integrally formed with the piston cylinder. The motor body is arranged in the mounting cavity and is drivingly connected to the piston to drive the piston to move. Thus, compared with the piston driving mechanism in the related art, the first cover body of the piston driving mechanism of the present application is integrally formed with the piston cylinder, which helps to reduce the assembly process between the driving motor and the piston cylinder, thereby helping to improve the assembly efficiency of the piston driving mechanism.

Description

Technical Field

[0001] This application relates to the field of air pump technology, and in particular to a piston drive mechanism and air pump equipment. Background Technology

[0002] Air pumps are commonly used to inflate bicycle tires or other inflatable objects such as electric bicycles. Air pumps typically use a piston-driven mechanism to compress and deliver gas.

[0003] However, when assembling the piston drive mechanism, the motor cover of the drive motor of the piston drive mechanism needs to be assembled with the cylinder bracket first, and then the cylinder bracket is assembled with the piston cylinder. This makes it necessary to accurately position and fix the multiple component brackets of the piston drive mechanism separately, which makes the assembly of the piston drive mechanism quite complicated. Utility Model Content

[0004] This application provides a piston drive mechanism and an air pump device, which can improve the assembly efficiency of the piston drive mechanism.

[0005] In a first aspect, embodiments of this application provide a piston drive mechanism, including:

[0006] Piston cylinder;

[0007] Piston, movably disposed within the piston cylinder; and

[0008] The drive motor includes a first cover, a cylinder, a second cover, and a motor body. The first cover and the second cover are located at opposite ends of the cylinder. The first cover, the cylinder, and the second cover cooperate to form an installation cavity. The first cover is integrally formed with the piston cylinder. The motor body is disposed in the installation cavity and is drively connected to the piston to drive the piston to move.

[0009] In some embodiments, the first cover body has a sleeve protruding towards the cylinder body, the sleeve is located inside the mounting cavity, and the motor body is connected to the sleeve via a bearing.

[0010] In some embodiments, the first cover is provided with a blocking rib located on the side of the first cover facing the sleeve, and the first cover extends around the edge of the sleeve.

[0011] In some embodiments, there are multiple blocking ribs, which are arranged sequentially at intervals around the edge of the sleeve.

[0012] In some embodiments, the first cover is provided with a reinforcing portion, which is connected to the connection between the first cover and the piston cylinder.

[0013] In some embodiments, there are multiple reinforcing parts, which are arranged sequentially along the edge of the air inlet of the piston cylinder.

[0014] In some embodiments, the first cover is provided with heat dissipation holes that extend through both opposite sides of the first cover.

[0015] Secondly, embodiments of this application provide an air pump device, including:

[0016] The housing has a receiving cavity;

[0017] A battery, wherein the battery is disposed within the receiving cavity; and

[0018] In any of the above embodiments, the piston drive mechanism and the battery are arranged along the length of the housing, and the piston drive mechanism is disposed within the receiving cavity.

[0019] In some embodiments, the housing further includes a housing body, a first end cap, and a second end cap, the housing body, the first end cap, and the second end cap cooperating to form the receiving cavity; the first end cap and the second end cap are respectively disposed at both ends of the housing body along the width direction of the housing.

[0020] In some embodiments, the air pump device further includes a circuit board electrically connected to the battery and the drive motor, the circuit board being stacked with the first end cover;

[0021] The circuit board is disposed between the piston drive mechanism and the first end cap; and / or, the circuit board is disposed between the battery and the first end cap.

[0022] The piston drive mechanism and air pump device provided in this application include a piston cylinder, a piston, and a drive motor. The piston is movably disposed within the piston cylinder. The drive motor includes a first cover, a cylinder, a second cover, and a motor body. The first and second covers are located at opposite ends of the cylinder, respectively, and the first cover, cylinder, and second cover cooperate to form a mounting cavity. The first cover is integrally formed with the piston cylinder, and the motor body is disposed within the mounting cavity and is drively connected to the piston to drive its movement. Thus, compared to piston drive mechanisms in related technologies, the piston drive mechanism of this application uses an integral molding technology to manufacture the first cover and piston cylinder, which helps reduce the assembly steps between the drive motor and piston cylinder, thereby improving the assembly efficiency of the piston drive mechanism. Furthermore, compared to piston drive mechanisms in related technologies, the piston drive mechanism of this application reduces the number of components such as mounting brackets and fasteners between the drive motor and piston rod, thereby helping to reduce the possibility of assembly errors in the piston drive mechanism. Moreover, the integral molding of the first cover and piston cylinder helps to reduce the number of components in the piston drive mechanism, thereby helping to reduce the risk of positioning errors, and further helping to improve the assembly efficiency and mechanical stability of the piston drive mechanism. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a schematic diagram of the piston drive mechanism provided in an embodiment of this application;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of the first cover and piston cylinder;

[0026] Figure 3 This is a schematic diagram of the structure of the air pump device provided in the embodiments of this application;

[0027] Figure 4 for Figure 3 A schematic diagram of the exploded structure of a medium-pressure air pump.

[0028] Figure 5 for Figure 3 A cross-sectional schematic diagram of a medium-pressure air pump.

[0029] Explanation of icon numbers:

[0030] 10. Piston drive mechanism; 20. Air pump equipment; 100. Piston cylinder; 200. Piston; 400. Drive motor; 410. First cover; 411. Sleeve; 412. Blocking rib; 413. Reinforcing part; 414. Heat dissipation hole; 420. Cylinder; 430. Second cover; 440. Motor body; 500. Housing; 510. Housing body; 520. First end cap; 530. Second end cap; 600. Battery; 700. Circuit board. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0033] In related technologies, air pumps are commonly used to inflate bicycle tires or electric bicycle tires. Air pumps typically use a piston-driven mechanism to compress and deliver gas. However, the inventors discovered that when assembling the piston-driven mechanism, the motor cover of the drive motor needs to be assembled with the cylinder bracket first, and then the cylinder bracket is assembled with the piston cylinder. This necessitates precise positioning and fixing of multiple component brackets within the piston-driven mechanism, making the assembly process rather cumbersome.

[0034] In view of this, please refer to Figure 1 and Figure 2 This application provides a piston drive mechanism 10, which may include a piston cylinder 100, a piston 200, and a drive motor 400. The piston 200 is movably disposed within the piston cylinder 100. The drive motor 400 includes a first cover 410, a cylinder 420, a second cover 430, and a motor body 440 (see...). Figure 5The first cover 410 and the second cover 430 are located at opposite ends of the cylinder 420. The first cover 410, the cylinder 420 and the second cover 430 cooperate to form an installation cavity. The first cover 410 is integrally formed with the piston cylinder 100. The motor body 440 is disposed in the installation cavity and is connected to the piston 200 to drive the piston 200 to move.

[0035] Thus, compared with the piston drive mechanism in the related technology, the piston drive mechanism 10 of this application is manufactured with the first cover 410 and the piston cylinder 100 using an integral molding technology, which helps to reduce the assembly process between the drive motor 400 and the piston cylinder 100, thereby helping to improve the assembly efficiency of the piston drive mechanism 10.

[0036] Furthermore, compared to piston drive mechanisms in related technologies, the piston drive mechanism 10 of this application reduces components such as mounting brackets and fasteners between the drive motor 400 and the piston rod 200, thereby helping to reduce the possibility of assembly errors in the piston drive mechanism 10.

[0037] Moreover, the first cover 410 and the piston cylinder 100 are integrally molded, which helps to reduce the number of parts of the piston drive mechanism 10, thereby helping to reduce the risk of positioning errors and thus helping to improve the assembly efficiency and mechanical stability of the piston drive mechanism 10.

[0038] Understandably, the first cover 410 and the piston cylinder 100 can be integrally formed using processes such as injection molding or die casting. Furthermore, the first cover 410 and the piston cylinder 100 can be manufactured using aluminum alloy, which helps to reduce the overall weight of the first cover 410 and the piston cylinder 100.

[0039] The piston 200, movably disposed within the piston cylinder 100, reciprocates under the action of an external driving force. When the drive motor 400 is directly driven to the piston 200 via the output shaft of the motor body 440 and moves it in one direction, the internal volume of the piston cylinder 100 increases, and the pressure decreases, thereby introducing external air through the intake valve. During this process, the airflow enters the piston cylinder 100 along a predetermined path. Subsequently, when the drive motor 400 drives the piston 200 to move in the opposite direction, the internal space of the piston cylinder 100 decreases, causing the gas to be compressed. As the pressure increases, the exhaust valve opens, and the compressed gas is delivered to the object to be inflated through the pipeline system.

[0040] Please see Figure 1 and Figure 2In some embodiments, a sleeve 411 protrudes from the first cover 410 toward the cylinder 420. The sleeve 411 is located within the mounting cavity, and the motor body 440 is connected to the sleeve 411 via a bearing. Thus, the motor body 440 is rotatably connected to the sleeve 411 via the bearing, enabling the motor body 440 to achieve stable rotational motion relative to the sleeve 411. This bearing structure not only bears part of the weight of the motor body 440 but also effectively reduces frictional resistance during motor operation, improving energy transfer efficiency. Simultaneously, the fit between the sleeve 411 and the bearing ensures the coaxiality and stability of the motor body 440 during operation, thereby reducing mechanical losses caused by eccentricity or vibration and extending the service life of the equipment.

[0041] In some embodiments, the motor body 440 serves as the core component providing driving force, with a reasonable structural design and complete functions. The motor body 440 mainly includes a stator assembly, a rotor assembly, an output shaft, bearings, a control circuit, and a heat dissipation structure. The bearings and stator assembly are fixedly mounted on the cylinder 420 of the drive motor 400. The stator assembly consists of an iron core and windings, generating a stable electromagnetic field after being energized. The rotor assembly works in conjunction with the stator, typically including a rotor iron core and permanent magnets, and can achieve rotation or linear motion based on the principle of electromagnetic induction, converting electrical energy into mechanical energy.

[0042] One end of the output shaft of the motor body 440 is fixedly connected to the rotor, and the other end extends to the outside of the sleeve 411 and is directly connected to the piston 200 (the output shaft can be connected to the piston 200 through a crank mechanism or gear mechanism, etc.). This is used to transmit the power generated by the drive motor 400 to the piston 200, driving it to reciprocate. To ensure smooth operation of the output shaft and reduce frictional loss, a bearing structure is set between the output shaft and the sleeve 411, providing support and guidance, while also improving the reliability and efficiency of the motor.

[0043] In addition, the motor body 440 also includes a control circuit and wiring components, which are responsible for receiving external control signals and adjusting the motor's start, stop, speed, and direction to adapt to different inflation requirements. To ensure the stability of the motor during long-term operation, the motor body 440 is also equipped with a heat dissipation structure, such as heat dissipation fins or ventilation channels, to effectively improve heat dissipation capacity and prevent performance from being affected by temperature rise.

[0044] In some embodiments, the first cover 410 is provided with a blocking rib 412, which is located on the side of the first cover 410 facing the sleeve 411, and the first cover 410 extends around the edge of the sleeve 411. Specifically, the blocking rib can serve as a reference surface or positioning reference for clamping operations during assembly, providing accurate alignment for the installation of the motor body 440 and related components, thereby improving assembly accuracy and production efficiency.

[0045] In addition, the structure of the blocking ribs 412 extending around the edge of the sleeve 411 can effectively prevent foreign objects from the external environment from entering the drive motor 400 during equipment operation, such as dust, particles or other impurities, so as to avoid these foreign objects from interfering with or damaging the precision components inside the drive motor 400, thereby ensuring the stable operation of the motor body 440 and extending its service life.

[0046] In some embodiments, multiple blocking ribs 412 are arranged sequentially and at intervals around the edge of the sleeve 411, forming a ring-shaped distribution structure. This multi-rib, spaced-out arrangement not only enhances the overall structural rigidity of the first cover 410 but also provides more uniform positioning support points during assembly, which is beneficial for improving the installation accuracy and stability of the motor body 440 and other related components. Simultaneously, the intervals between the multiple blocking ribs 412 can achieve a certain degree of airflow channel control without affecting functionality, helping to balance internal and external pressure.

[0047] In addition, the multiple blocking ribs 412 distributed circumferentially around the edge of the sleeve 411 can more effectively prevent external dust, particles and other foreign objects from entering the drive motor 400, thereby protecting the precision components of the drive motor 400 from contamination or wear and ensuring the reliability and safety of the equipment in long-term operation.

[0048] In some embodiments, the first cover 410 is provided with a reinforcing part 413, which is connected to the connection between the first cover 410 and the piston cylinder 100. The reinforcing part 413 is disposed in the connection area between the first cover 410 and the piston cylinder 100 and is fixedly connected to the two to form a structural reinforcement area.

[0049] The function of the reinforcing part 413 is to enhance the load-bearing capacity and deformation resistance of the integrally formed part of the first cover 410 and the piston cylinder 100. Especially when the piston 200 is subjected to periodic stress during reciprocating motion, it can effectively prevent structural fatigue or fracture caused by stress concentration, thereby improving the mechanical strength and service life of the entire piston drive mechanism 10.

[0050] Furthermore, the presence of the reinforcing part 413 helps improve assembly accuracy and the uniformity of force distribution, making the connection between the drive motor 400 and the piston cylinder 100 more robust and reliable, preventing loosening or failure due to vibration or external impact. This structural design not only enhances the rigidity of the overall component but also further improves the stability and safety of the air pump device 20 during operation.

[0051] In some embodiments, there are multiple reinforcing parts 413, which are arranged sequentially along the edge of the air inlet of the piston cylinder 100 in a surrounding pattern. This arrangement allows the multiple reinforcing parts 413 to evenly distribute the stress load generated during the movement of the piston 200, effectively improving the structural strength and fatigue resistance of the connection between the first cover 410 and the piston cylinder 100. Simultaneously, because the reinforcing parts 413 are located near the air inlet, they not only strengthen the structure but also improve the rigidity of the area around the air inlet, preventing deformation caused by stress or vibration, thereby ensuring the stability of the gas flow path and sealing performance.

[0052] Furthermore, the multiple reinforcing sections 413 arranged along the edge of the air intake can also play a certain positioning assistance role during the assembly process, improve the fitting accuracy between the overall components, and ensure the stability and consistency of the connection between the drive motor 400 and the piston cylinder 100. This structural design not only enhances the load-bearing capacity of key parts, but also improves the manufacturing yield and assembly efficiency of the product to a certain extent.

[0053] In some embodiments, the first cover 410 is provided with heat dissipation holes 414, which extend through the opposite sides of the first cover 410, thereby forming an airflow channel and achieving good ventilation and cooling effects.

[0054] Furthermore, the location and number of heat dissipation holes 414 are rationally arranged according to the heat distribution and airflow characteristics of the motor body 440 to ensure maximum heat dissipation efficiency. At the same time, while ensuring heat dissipation function, the diameter and shape design of the heat dissipation holes 414 also take into account the requirement of preventing external foreign objects from entering the motor, which helps to maintain the cleanliness and safety of the internal structure of the drive motor 400 while improving heat dissipation capacity.

[0055] Please see Figures 3 to 5 This application embodiment also provides an air pump device 20, which includes a housing 500 and a piston drive mechanism 10. The housing 500 is provided with a receiving cavity, and the piston drive mechanism 10 is disposed in the receiving cavity, thereby realizing a compact and reasonable overall design.

[0056] In a specific embodiment, the housing 500 is made of a material with sufficient strength and rigidity to ensure good protection for the internal piston drive mechanism 10 and other related components. Simultaneously, functional openings such as vents, air inlets, and air outlets are provided at corresponding positions on the housing 500 to facilitate gas flow and external connection. The vent design helps improve the overall heat dissipation performance, preventing overheating caused by motor operation or changes in ambient temperature, thereby enhancing the operational stability and safety of the air pump device 20. Furthermore, the air pump device 20 can also be equipped with a fan inside the housing 500 to drive airflow through the heat dissipation holes 414.

[0057] The air pump device 20 also includes a battery 600, which is disposed within a receiving cavity. The battery 600 and the piston drive mechanism 10 are arranged along the length of the housing 500. Specifically, the battery 600 serves as the power source for the air pump device 20, is installed inside the receiving cavity and electrically connected to the piston drive mechanism 10, and provides it with the electrical energy required for operation. Arranging the battery 600 and the piston drive mechanism 10 sequentially along the length of the housing 500 not only avoids the increased volume caused by vertical stacking, but also makes the overall center of gravity distribution more balanced, improving the stability and portability of the device during use.

[0058] Furthermore, based on this layout, heat dissipation holes or thermal conductive structures can be provided at corresponding positions on the housing 500 to enhance the thermal management performance of the battery 600 and the piston drive mechanism 10 during their respective operations, preventing mutual heat interference and resulting in localized overheating. Simultaneously, an isolation and protective structure can be provided between the battery 600 and the piston drive mechanism 10 to improve electrical safety and prevent short circuits or other abnormalities caused by vibration or external impacts.

[0059] In some embodiments, the housing 500 further includes a housing body 510, a first end cap 520 and a second end cap 530, which cooperate to form a receiving cavity. Along the width direction of the housing 500, the first end cap 520 and the second end cap 530 are respectively disposed at both ends of the housing body 510, forming an overall closed or semi-closed spatial structure to achieve effective protection of the piston drive mechanism 10 and other key components.

[0060] In a specific embodiment, the shell body 510 serves as the main structure, and its cross-sectional shape can be designed as rectangular, circular, or polygonal, etc., according to actual needs. Internally, it is equipped with positioning structures and fixing positions for mounting components such as the piston drive mechanism 10 and the battery 600. The first end cap 520 and the second end cap 530 are detachably or fixedly connected to both ends of the shell body 510 via fasteners, snap-fit ​​structures, or integral molding processes, ensuring the sealing of the accommodating cavity and structural stability. This split-type shell 500 structure not only facilitates the assembly and maintenance of internal components but also allows for flexible adjustment of the configuration of each part according to different usage scenarios.

[0061] Furthermore, in the design of the housing 500, functional components such as air vents, power interfaces, and control buttons can be provided on the first end cover 520 or the second end cover 530 as needed to improve the ease of operation and human-machine interaction of the equipment. Meanwhile, sealing elements, such as rubber gaskets or sealing strips, are provided at the connection between the end cover and the housing body 510 to enhance the overall dustproof and waterproof performance and meet the needs of use in different environments.

[0062] In some embodiments, the air pump device 20 also includes a circuit board 700, which is used to realize the electrical connection between the battery 600 and the drive motor 400, and to control the operating status of the piston drive mechanism 10. The circuit board 700 may integrate electronic components such as a power management module, a motor drive module, a pressure detection module, and an overload protection module, and can realize intelligent control of functions such as starting, stopping, regulating inflation pressure, and responding to abnormal situations of the air pump device 20.

[0063] In terms of structural layout, the circuit board 700 and the first end cover 520 are stacked. Specifically, the circuit board 700 is located between the piston drive mechanism 10 and the first end cover 520; or, the circuit board 700 is located between the battery 600 and the first end cover 520. In some preferred embodiments, multiple circuit boards 700 can also be arranged in the above two positions according to functional requirements to realize the modular design and functional partitioning of the control system.

[0064] When the circuit board 700 is positioned between the piston drive mechanism 10 and the first end cover 520, it can shorten the electrical connection distance between the circuit board 700 and the drive motor 400, reduce the length of the wires, improve signal transmission efficiency and system response speed, and also facilitate the rational use of the internal space of the entire machine. When the circuit board 700 is positioned between the battery 600 and the first end cover 520, it is easier to monitor and manage the working status of the battery 600 in real time, such as voltage detection and charge / discharge control, thereby improving the electrical safety and stability of the system.

[0065] To further enhance the installation reliability of the circuit board 700 within the housing 500, an insulating fixing bracket can be installed around it, or an embedded positioning groove can be used for secure installation. Additionally, a buffer pad can be placed between the circuit board 700 and the first end cover 520 to prevent damage to the circuit board 700 or failure of electrical connections due to external vibration or impact. The first end cover 520 has corresponding through holes or reserved slots for leading out control lines, charging interfaces, or indicator light assemblies to support the connection of external operating interfaces or charging devices, thereby improving the human-machine interaction experience.

[0066] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0067] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “” used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof.

[0068] The above are merely specific embodiments of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model. Therefore, this utility model is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A piston drive mechanism, characterized in that, include: Piston cylinder; The piston is movably disposed within the piston cylinder; as well as The drive motor includes a first cover, a cylinder, a second cover, and a motor body. The first cover and the second cover are located at opposite ends of the cylinder. The first cover, the cylinder, and the second cover cooperate to form an installation cavity. The first cover is integrally formed with the piston cylinder. The motor body is disposed in the installation cavity and is drively connected to the piston to drive the piston to move.

2. The piston drive mechanism according to claim 1, characterized in that, The first cover has a sleeve protruding towards the cylinder, the sleeve is located inside the mounting cavity, and the motor body is connected to the sleeve through a bearing.

3. The piston drive mechanism according to claim 2, characterized in that, The first cover is provided with a blocking rib, which is located on the side of the first cover facing the sleeve, and the first cover extends around the edge of the sleeve.

4. The piston drive mechanism according to claim 3, characterized in that, The number of the blocking ribs is multiple, and the multiple blocking ribs are arranged sequentially at intervals around the edge of the sleeve.

5. The piston drive mechanism according to claim 1, characterized in that, The first cover is provided with a reinforcing part, which is connected to the connection between the first cover and the piston cylinder.

6. The piston drive mechanism according to claim 5, characterized in that, The number of reinforcing parts is multiple, and the multiple reinforcing parts are arranged sequentially along the edge of the air inlet of the piston cylinder.

7. The piston drive mechanism according to claim 1, characterized in that, The first cover is provided with heat dissipation holes, which extend through both opposite sides of the first cover.

8. An air pump device, characterized in that, include: The housing has a receiving cavity; A battery, wherein the battery is disposed within the receiving cavity; as well as According to any one of claims 1 to 7, the battery and the piston drive mechanism are arranged along the length direction of the housing, and the piston drive mechanism is disposed within the receiving cavity.

9. The air pump device according to claim 8, characterized in that, The housing further includes a housing body, a first end cap, and a second end cap, which together form the receiving cavity; along the width direction of the housing, the first end cap and the second end cap are respectively disposed at both ends of the housing body.

10. The air pump device according to claim 9, characterized in that, The air pump device also includes a circuit board, which is electrically connected to the battery and the drive motor, and the circuit board is stacked with the first end cover. The circuit board is disposed between the piston drive mechanism and the first end cap; and / or, the circuit board is disposed between the battery and the first end cap.

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