High-sealing-performance air bag pump

Abstract

The utility model discloses a high-sealing-performance air bag pump, and belongs to the technical field of pump body equipment. Comprising a movable center shaft and an air cylinder wall, and the end of the movable center shaft penetrates through the air cylinder wall to be connected with the end of an air bag. Multiple sealing pieces are arranged on the outer wall of the end of the movable center shaft so as to seal a gap between the outer wall of the end of the movable center shaft and the wall of the air cylinder. The multiple sealing piece comprises a solid second protective layer which is close to the first protective layer and is arranged in the first protective layer; and a lubricating layer is arranged between the first protective layer and the second protective layer. According to the air bag pump, fluid in the liquid phase working cavity is prevented from entering the connecting part of the connecting shaft and the air bag from a gap between the air cylinder and the connecting shaft through a specific structure, and then high sealing performance and high abrasion resistance of the air bag pump are achieved.

Description

Technical Field

[0001] This application belongs to the field of pump body equipment technology and relates to a high-sealing airbag pump. Background Technology

[0002] The central shaft is often a key component for power transmission in airbag pumps. When compressed air drives the central shaft, it transmits this power to the airbag, causing it to reciprocate (expand and contract). The connection between the central shaft and the airbag usually requires a seal to prevent fluid leakage; however, during long-term operation, the reciprocating motion of the central shaft causes the rubber seals to be constantly subjected to friction and compression, leading to wear and aging. Furthermore, a certain gap exists between the cylinder and the connecting shaft, which may allow fluid in the liquid phase working chamber to leak through the gap between the cylinder and the connecting shaft at the connection point between the connecting shaft and the airbag, potentially allowing corrosive liquids to enter other spaces and creating a safety hazard.

[0003] Therefore, a wind bag pump with high sealing performance at the connection between the central shaft and the wind bag is needed. Utility Model Content

[0004] To address the aforementioned problems, this application proposes a high-sealing airbag pump. This airbag pump, through specific structural improvements, prevents fluid in the liquid phase working chamber from entering the connection between the connecting shaft and the airbag through the gap between the cylinder and the connecting shaft. This achieves high sealing performance and high wear resistance in the airbag pump.

[0005] The specific technical solution of this application is as follows:

[0006] A high-sealing airbag pump includes: a movable central shaft (piston rod), a cylinder wall, and an end of the movable central shaft passing through the cylinder wall and connected to the end of the airbag;

[0007] Multiple seals are provided circumferentially on the outer wall of the end of the movable center shaft to seal the gap between the outer wall of the end of the movable center shaft and the cylinder wall.

[0008] The multiple seals include a solid second protective layer located near the first protective layer and disposed inside the first protective layer; a lubricating layer is disposed between the first and second protective layers.

[0009] Optionally, the first and second protective layers are made of corrosion-resistant rubber materials, including fluororubber and polytetrafluoroethylene; the lubrication layer is made of lubricating oil or grease.

[0010] Optionally, continuous protrusions and grooves are provided on the outer wall of the active center shaft end near the multiple seals to form an uneven surface channel on the outer wall of the active center shaft end.

[0011] Optionally, a flow guide is provided on the side of the second protective layer near the liquid phase fluid cavity. Further, the flow guide is arc-shaped with its opening facing upwards; one end of the arc-shaped flow guide is connected to the upper part of the second protective layer, and the other end abuts against the end of the movable central shaft.

[0012] Optionally, the outer side of the first protective layer is provided with an elastic pressure-resistant member with a honeycomb structure.

[0013] Optionally, the outer walls of both the first protective layer and the second protective layer are arc-shaped.

[0014] Optionally, the thickness of the lubricating layer is 0.1-0.3 mm.

[0015] Optionally, the connection between the multiple seals and the end of the movable central shaft includes threaded connection, slot connection, and pin connection. Further, the slot connection is characterized by: a groove on the outer wall of the end of the movable central shaft, and a protrusion on the outer wall of the first protective layer that mates with the groove; the groove is in the shape of a dovetail groove.

[0016] The beneficial effects that this application may produce include, but are not limited to:

[0017] 1. The multi-layer seal provided in this application can achieve excellent sealing effect. The lubrication layer can lubricate the first and second protective layers, reducing the friction of the sealing ring during the movement of the moving central shaft. On the other hand, even if the first protective layer leaks slightly, the lubrication layer between the first and second protective layers can also provide a temporary seal to prevent large-scale fluid leakage.

[0018] 2. Furthermore, continuous protrusions and grooves are provided on the outer wall of the active center shaft end near the multiple seals to form an uneven surface channel on the outer wall of the active center shaft end. When the liquid passes through these channels, it is difficult to break through the sealing structure due to energy loss and frequent changes in direction.

[0019] 3. Furthermore, a flow guide is provided on the outer side of the second protective layer. Further, the flow guide is arc-shaped with its opening facing upwards. One end of the arc-shaped flow guide is connected to the upper part of the second protective layer, and the other end abuts against the outer wall of the end of the movable central shaft. The flow guide can guide a small amount of potentially leaking liquid to a safe location, preventing liquid accumulation and damage to the sealing structure. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1This is a schematic diagram of the overall cross-sectional structure of the wind bag pump of this application;

[0022] Figure 2 for Figure 1 An enlarged view of part A;

[0023] Figure 3 for Figure 2 An enlarged view of part C;

[0024] Figure 4 This is a partial structural diagram of this application.

[0025] List of components and reference numerals:

[0026] 1. Movable central shaft, 2. Multiple seals, 201. First protective layer, 202. Lubricating layer, 203. Second protective layer, 3. Airbag, 4. Liquid phase fluid cavity, 5. Cylinder wall, 6. Guide component, 7. Dovetail groove. Detailed Implementation

[0027] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0028] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0030] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0034] As a specific implementation method, such as Figure 1-4 As shown. A high-sealing airbag pump includes: a movable central shaft 1 (piston rod), a cylinder wall 5, and the end of the movable central shaft 1 passing through the cylinder wall 5 and connected to the end of the airbag 3;

[0035] The outer wall of the end of the movable central shaft 1 is provided with multiple sealing elements 2 (that is, the multiple sealing elements 2 are circumferentially sleeved on the outer wall of the end of the movable central shaft 1) to seal the gap between the outer wall of the end of the movable central shaft 1 and the cylinder wall 5.

[0036] The multiple sealing element 2 includes a solid second protective layer 203 located near the first protective layer 201 and disposed inside the first protective layer 201; a lubricating layer 202 is disposed between the first protective layer 201 and the second protective layer 203.

[0037] In this embodiment, the first protective layer 201 and the second protective layer 203 are both fluororubber protective layers made of fluororubber; the lubricating layer 202 is a lubricating oil layer filled with lubricating oil. The thickness of the lubricating oil (the distance between the first protective layer 201 and the second protective layer 203) is 0.2 mm.

[0038] In actual use, under the action of compressed air, the central shaft reciprocates (expands and contracts). At this time, the outer wall of the sealing ring will continuously rub against the outer surface of the central shaft (piston rod). The lubrication layer 202 can lubricate the first protective layer 201 and the second protective layer 203, reducing the friction of the sealing ring in all directions during the movement of the moving central shaft 1. On the other hand, even if the first protective layer 201 is damaged during long-term use, the lubrication layer 202 between the first protective layer 201 and the second protective layer 203 can still play a certain sealing role to prevent fluid leakage.

[0039] In a preferred embodiment, the first protective layer 201 and the second protective layer 203 are made of corrosion-resistant rubber materials, including fluororubber and polytetrafluoroethylene; the lubricating layer 202 is made of lubricating oil or grease. Fluororubber has excellent chemical corrosion resistance and can resist the erosion of various strong acids, strong alkalis, and organic solvents. Perfluoroether rubber (FFKM) is a higher-performance sealing material that can resist corrosion from almost all chemicals, including some extreme corrosive media such as fuming sulfuric acid and hydrofluoric acid. Its sealing performance remains reliable under high temperature, high pressure, and highly corrosive environments.

[0040] In a preferred embodiment, continuous protrusions and grooves are provided on the outer wall of the end of the movable central shaft 1 near the multiple seals 2 to form an uneven surface channel on the outer wall of the end of the movable central shaft 1. When the liquid passes through these channels, it is difficult to break through the sealing structure due to energy loss and frequent changes in direction, thus achieving a high degree of sealing.

[0041] In a preferred embodiment, a flow guide 6 is provided on the side of the second protective layer 203 near the liquid phase fluid cavity 4. Furthermore, the flow guide 6 is arc-shaped with its opening facing upwards. One end of the arc-shaped flow guide 6 is connected to the upper part of the second protective layer 203, and the other end abuts against the outer wall of the end of the movable central shaft 1. The flow guide 6 can guide a small amount of potentially leaking liquid to a safe position (this structure can guide leaked liquid towards the liquid phase fluid cavity 4), preventing liquid accumulation from damaging the sealing structure.

[0042] In a preferred embodiment, a honeycomb-structured elastic pressure-resistant member is provided on the outer side of the first protective layer 201. The material of the elastic pressure-resistant member is the same as that of the first protective layer 201. When subjected to external force, the air in the honeycomb-structured elastic pressure-resistant member can be compressed, which can better disperse the pressure. When the external force disappears, the compressed air will expand, causing the rubber to return to its original shape, preventing the seal from being worn and improving the sealing effect.

[0043] In a preferred embodiment, the outer walls of both the first protective layer 201 and the second protective layer 203 are arc-shaped. The arc-shaped outer walls allow for smoother liquid flow on their surfaces and reduce the liquid's residence time at the ends.

[0044] In a preferred embodiment, the thickness of the lubricating layer 202 is 0.1-0.3 mm. This thickness reduces friction between the first protective layer 201 and the second protective layer 203 while ensuring their stability.

[0045] In a preferred embodiment, the connection between the multiple seal 2 and the end of the movable central shaft 1 includes threaded connection, slot connection, and pin connection. Further, the slot connection comprises: a groove on the outer wall of the end of the movable central shaft 1, and a protrusion on the outer wall of the first protective layer 201 that mates with the groove; the groove is shaped like a dovetail groove 7. The dovetail groove 7 shape prevents the first protective layer 201 from easily disengaging from the end of the movable central shaft 1 in the axial and radial directions, enhancing the stability between them.

[0046] Furthermore, a transmission plate is provided at the end of the air bag 3, and the end of the movable central shaft 1 is connected to the air bag 3 as a whole through the transmission plate.

[0047] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0048] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A high-sealing airbag pump, characterized in that, include: The movable center shaft, the cylinder wall, and the end of the movable center shaft pass through the cylinder wall and are connected to the end of the air bag; Multiple seals are provided circumferentially on the outer wall of the end of the movable center shaft to seal the gap between the outer wall of the end of the movable center shaft and the cylinder wall. The multiple seals include a solid second protective layer located near the first protective layer and disposed inside the first protective layer; a lubricating layer is disposed between the first and second protective layers.

2. The airbag pump according to claim 1, characterized in that, The first and second protective layers are made of corrosion-resistant rubber materials, including fluororubber and polytetrafluoroethylene; the lubrication layer is made of lubricating oil or grease.

3. The airbag pump according to claim 1, characterized in that, A series of protrusions and grooves are provided on the outer wall of the active center shaft end near the multiple seals to form an uneven surface channel on the outer wall of the active center shaft end.

4. The airbag pump according to claim 1, characterized in that, The second protective layer has a flow guide on the side near the liquid phase fluid cavity.

5. The airbag pump according to claim 4, characterized in that, The flow guide is arc-shaped with its opening facing upward. One end of the arc-shaped flow guide is connected to the top of the second protective layer, and the other end abuts against the outer wall of the end of the active center shaft.

6. The airbag pump according to claim 1, characterized in that, The outer side of the first protective layer is provided with an elastic pressure-resistant component with a honeycomb structure.

7. The airbag pump according to claim 1, characterized in that, Both the first protective layer and the second protective layer have arc-shaped outer walls.

8. The airbag pump according to claim 1, characterized in that, The thickness of the lubricating layer is 0.1-0.3 mm.

9. The airbag pump according to claim 1, characterized in that, The connection between the multiple seals and the end of the movable center shaft includes threaded connection, groove connection, and pin connection.

10. The airbag pump according to claim 9, characterized in that, The slot connection is as follows: a groove is provided on the outer wall of the end of the movable central shaft, and a protrusion that mates with the groove is provided on the outer wall of the first protective layer; the groove is in the shape of a dovetail groove.

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