Linear motion flexible expansion machine power system based on permanent magnet centering

Abstract

The invention provides a linear motion flexible expansion machine power system based on permanent magnet centering, comprising: a flexible piston comprising a flexible film, a piston top cover and a piston bottom cover, the flexible film being cylindrical and being capable of axially telescoping, the piston top cover and the piston bottom cover being respectively arranged at two axial ends of the flexible film, the piston top cover and the piston bottom cover can move relatively so that the flexible film can be compressed or expanded. The air cylinder shell comprises an end plate, the end plate is arranged on the side, away from the piston bottom cover, of the piston top cover, the end plate and the piston bottom cover are relatively fixed, and a through hole is formed in the end plate; the magnetic lantern ring is arranged in the through hole; the magnetic piston rod penetrates through the magnetic lantern ring and is connected with the piston top cover, and the magnetic piston rod and the magnetic lantern ring form a permanent magnet centering structure. According to the linear motion flexible expansion machine power system based on permanent magnet centering, linear positioning of the flexible piston can be achieved through a permanent magnet centering structure, and meanwhile the problems of contact friction, lateral force clamping and the like can be avoided during positioning.

Description

Technical Field

[0001] This application relates to the field of expander technology, and more specifically, to a linear motion flexible expander power system based on permanent magnet centering. Background Technology

[0002] Energy conservation and emission reduction are crucial issues in energy, chemical, electrical, and construction industries, with the development and utilization of low-temperature heat sources (such as geothermal, industrial waste heat, and solar energy) being particularly critical. However, due to the low temperatures of these heat sources, their conversion efficiency into kinetic or electrical energy is extremely low, resulting in poor economic viability and even situations where self-loss exceeds energy output. Currently, the utilization of low-temperature heat sources is mostly limited to direct heating, such as geothermal hot springs or industrial waste heat heating. However, these heat sources are difficult to utilize effectively in seasons or regions where heating is not required. Therefore, the development of efficient and low-cost low-temperature heat source expanders has become an urgent need.

[0003] Piston expanders are proven high-efficiency expanders, but their traditional design contains an inherent contradiction: balancing the sealing effect between the piston and cylinder with frictional resistance is difficult. Better sealing results in greater frictional resistance; conversely, reduced frictional resistance leads to poorer sealing. To address this issue, existing technologies (such as patent CN106321280A) propose using flexible piston designs. This reduces mechanical losses by minimizing friction and leakage, making it possible to utilize low-temperature waste heat. However, the flexible piston design introduces new problems: traditional pistons rely on precise fit with the cylinder for linear motion positioning, while flexible pistons lack this mechanical fit, making precise control of their linear trajectory difficult. Therefore, a new positioning design is urgently needed to solve the positioning problem of flexible pistons in linear motion. Summary of the Invention

[0004] This application provides at least one linear motion flexible expander power system based on permanent magnet centering. This system can achieve linear positioning of the flexible piston through the permanent magnet centering structure, while avoiding problems such as contact friction and lateral force jamming during positioning.

[0005] This application provides a linear motion flexible expander power system based on permanent magnet centering, including: A flexible piston includes a flexible membrane, a piston top cover, and a piston bottom cover. The flexible membrane is cylindrical and capable of axial expansion and contraction. The piston top cover and the piston bottom cover are respectively disposed at both ends of the flexible membrane. The piston top cover and the piston bottom cover are capable of relative movement to allow the flexible membrane to expand and contract. A cylinder housing includes an end plate, which is disposed on the side of the piston top cover away from the piston bottom cover. The end plate is fixed relative to the piston bottom cover and has a through hole. A magnetic collar, wherein the magnetic collar is disposed in the through hole; A magnetic piston rod passes through the magnetic collar and is connected to the piston top cover. The magnetic piston rod and the magnetic collar form a permanent magnet centering structure.

[0006] In one optional embodiment, the magnetic collar and the magnetic piston rod are made of permanent magnet material or electromagnetic material.

[0007] In one optional embodiment, the axis of the magnetic collar coincides with the axis of the flexible piston.

[0008] In one optional embodiment, the cylinder housing further includes a connecting sleeve, which is sleeved on the flexible piston. One end of the connecting sleeve is connected to the piston bottom cover, and the other end is connected to the end plate.

[0009] In one alternative embodiment, a gap exists between the connecting sleeve and the piston top cover.

[0010] In one optional embodiment, the connecting sleeve and the piston top cover are in a sliding fit.

[0011] In one optional embodiment, the side wall of the connecting sleeve is provided with a compensation hole, which is used for air to enter and exit in order to compensate for volume changes of the flexible membrane.

[0012] In one optional embodiment, the number of through holes is multiple, and the multiple through holes are evenly distributed along the circumference of the connecting sleeve.

[0013] The above-mentioned technical solution of this application has the following beneficial technical effects: The linear motion flexible expander power system based on permanent magnet centering in this application embodiment can achieve linear positioning of the flexible piston by setting a magnetic collar and a magnetic piston rod (permanent magnet centering structure). Moreover, since the magnetic collar and the magnetic piston rod do not contact each other, contact friction between the two can be avoided, reducing frictional losses of the expander, and avoiding problems such as jamming due to lateral force.

[0014] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this application and, together with the specification, serve to explain the technical solutions of this application. It should be understood that the following drawings only show some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of a linear motion flexible expander power system based on permanent magnet centering provided in an embodiment of this application is shown. Figure 2 It shows Figure 1 A sectional view of the system in the image; Figure 3 It shows Figure 2 A schematic diagram of a flexible piston in a compressed state; Figure 4 It shows Figure 2 A schematic diagram of the magnetic circuit of the magnetic collar and magnetic piston rod in the image; In the diagram: 1. Flexible piston; 11. Flexible diaphragm; 12. Piston top cover; 13. Piston bottom cover; 2. Cylinder housing; 21. End plate; 22. Connecting sleeve; 221. Compensation hole; 3. Magnetic collar; 4. Magnetic piston rod. Detailed Implementation

[0017] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0018] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0021] In the description of this application, it should be noted that, unless otherwise expressly 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] refer to Figures 1 to 4 This application provides a linear motion flexible expander power system based on permanent magnet centering, including a flexible piston 1. The flexible piston 1 includes a flexible membrane 11, a piston top cover 12, and a piston bottom cover 13. The flexible membrane 11 is cylindrical and capable of axial expansion and contraction. The piston top cover 12 and the piston bottom cover 13 are parallel to each other and are respectively disposed at the axial ends of the flexible membrane 11. The piston top cover 12 and the piston bottom cover 13 can move relative to each other to allow the flexible membrane 11 to expand and contract. During use, each contraction and expansion of the flexible membrane 11 completes one work operation. Compared with traditional piston engines, there is no precise fit between the flexible piston 1 and the cylinder in this system. On the one hand, this reduces the motion resistance between the piston and the cylinder, reducing the self-wear of the expander; on the other hand, it greatly reduces the machining accuracy requirements and manufacturing costs.

[0023] In some embodiments, the linear motion flexible expander power system based on permanent magnet centering further includes a cylinder housing 2, a magnetic collar 3, and a magnetic piston rod 4. The cylinder housing 2 includes an end plate 21, which is disposed on the side of the piston top cover 12 opposite to the piston bottom cover 13. The end plate 21 is fixed relative to the piston bottom cover 13 and has a through hole. The magnetic collar 3 is disposed in the through hole. The magnetic piston rod 4 passes through the magnetic collar 3 and connects to the piston top cover 12. The magnetic piston rod 4 and the magnetic collar 3 form a permanent magnet centering structure. That is, the magnetic collar 3 can use its generated magnetic field force (attractive or repulsive force) to resist the lateral force between the magnetic piston rod 4 and the magnetic collar 3, causing the magnetic piston rod 4 to automatically tend towards and remain at the center position of the magnetic collar 3. During use, the magnetic collar 3 and the magnetic piston rod 4 cooperate with each other to achieve linear positioning of the flexible piston 1. Moreover, since the magnetic collar 3 and the magnetic piston rod 4 do not contact each other, they can avoid contact friction between them, reduce frictional loss of the expander, and avoid problems such as jamming due to lateral force.

[0024] In some embodiments, the magnetic collar 3 and the magnetic piston rod 4 are made of permanent magnet material or electromagnetic material. In this embodiment, the magnetic collar 3 and the magnetic piston rod 4 are made of permanent magnet material.

[0025] In some embodiments, the axis of the magnetic collar 3 coincides with the axis of the flexible piston 1. By setting the axis of the magnetic collar 3 and the axis of the flexible piston 1 to coincide, the magnetic piston rod can be connected to the axis of the piston top cover 12. Specifically, since the magnetic piston rod 4 is located at the center of the magnetic collar 3, and the axis of the magnetic collar 3 coincides with the axis of the flexible piston 1, the magnetic piston rod can be connected to the axis of the piston top cover 12 during installation. This arrangement ensures that the load is transmitted along the centerline of the flexible piston 1, avoiding off-center loading, tilting, abnormal wear, and energy loss, thereby ensuring the sealing performance, efficiency, reliability, and service life of the equipment.

[0026] In some embodiments, the cylinder housing 2 further includes a connecting sleeve 22, which is sleeved on the flexible piston 1. One end of the connecting sleeve 22 is connected to the piston bottom cover 13, and the other end is connected to the end plate 21. That is, the end plate 21 can be connected to the piston bottom cover 13 through the connecting sleeve 22 to fix the end plate 21 relative to the piston bottom cover 13. In this embodiment, the end plate 21 and the connecting sleeve 22 form a cylindrical structure for installing and accommodating the flexible piston 1.

[0027] In some embodiments, the axis of the connecting sleeve 22 coincides with the axis of the flexible piston 1.

[0028] In some embodiments, there is a gap between the connecting sleeve 22 and the piston top cover 12. That is, during the deformation of the flexible piston 1, the piston top cover 12 and the connecting sleeve 22 do not contact each other, which can avoid contact friction between the piston top cover 12 and the connecting sleeve 22 and reduce the friction loss of the expander.

[0029] In some embodiments, the connecting sleeve 22 and the piston top cover 12 are slidably fitted together. For example, the inner wall of the connecting sleeve 22 is provided with a guide rail that slidably fits with the piston top cover 12. That is, during the deformation of the flexible piston 1, the connecting sleeve 22 can guide the piston top cover 12, which can improve the stability of the movement of the piston top cover 12, thereby helping to ensure the reliability and service life of the equipment.

[0030] In some embodiments, the sidewall of the connecting sleeve 22 is provided with a compensation hole 221, which is used for air to enter and exit to compensate for volume changes of the flexible membrane 11. In this embodiment, the compensation hole 221 is a through hole, and there are multiple through holes, which are evenly distributed along the circumference of the connecting sleeve 22.

[0031] The linear motion flexible expander power system based on permanent magnet centering in this application embodiment can achieve linear positioning of the flexible piston by setting a magnetic collar and a magnetic piston rod (permanent magnet centering structure). Moreover, since the magnetic collar and the magnetic piston rod do not contact each other, contact friction between the two can be avoided, reducing frictional losses of the expander, and avoiding problems such as jamming due to lateral force.

[0032] One or more embodiments in this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this specification should be included within the protection scope of this application.

[0033] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A linear motion flexible expander power system based on permanent magnet centering, characterized in that, include: A flexible piston includes a flexible membrane, a piston top cover, and a piston bottom cover. The flexible membrane is cylindrical and capable of axial expansion and contraction. The piston top cover and the piston bottom cover are respectively disposed at both ends of the flexible membrane. The piston top cover and the piston bottom cover are capable of relative movement to allow the flexible membrane to expand and contract. A cylinder housing includes an end plate, which is disposed on the side of the piston top cover away from the piston bottom cover. The end plate is fixed relative to the piston bottom cover and has a through hole. A magnetic collar, wherein the magnetic collar is disposed in the through hole; A magnetic piston rod passes through the magnetic collar and is connected to the piston top cover. The magnetic piston rod and the magnetic collar form a permanent magnet centering structure.

2. The linear motion flexible expander power system based on permanent magnet centering according to claim 1, characterized in that, The magnetic collar and the magnetic piston rod are made of permanent magnet material or electromagnetic material.

3. The linear motion flexible expander power system based on permanent magnet centering according to claim 1, characterized in that, The axis of the magnetic collar coincides with the axis of the flexible piston.

4. The linear motion flexible expander power system based on permanent magnet centering according to claim 1, characterized in that, The cylinder housing also includes a connecting sleeve, which is fitted onto the flexible piston. One end of the connecting sleeve is connected to the piston bottom cover, and the other end is connected to the end plate.

5. The linear motion flexible expander power system based on permanent magnet centering according to claim 4, characterized in that, There is a gap between the connecting sleeve and the piston top cover.

6. The linear motion flexible expander power system based on permanent magnet centering according to claim 4, characterized in that, The connecting sleeve and the piston top cover are in a sliding fit.

7. The linear motion flexible expander power system based on permanent magnet centering according to claim 4, characterized in that, The side wall of the connecting sleeve is provided with a compensation hole, which is used for air to enter and exit in order to compensate for the volume change of the flexible membrane.

8. The linear motion flexible expander power system based on permanent magnet centering according to claim 7, characterized in that, The number of through holes is multiple, and the multiple through holes are evenly distributed along the circumference of the connecting sleeve.

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