Movable valve rod structure of air cylinder
By adopting a dual guarantee design combining maze seals and seals in the cylinder, the problems of complex structure and poor sealing of traditional cylinders are solved, efficient sealing and connection tightness are achieved, and reliability for long-term use is ensured.
Patent Information
- Application Number
- CN202422358814.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-09-27
AI Technical Summary
The traditional cylinder structure is too complex and has many parts, making it difficult to maintain sealing and the integrity of internal gas flow under high pressure, and it is not convenient to identify defects and repair after long-term use.
The double guarantee design combining maze seals and seals is adopted. Through the structures of the first oil seal, press seat and second oil seal, the first seal ring, the second seal ring, the valve sleeve, the spring of the elastic return valve sleeve, the two-way seal ring and the planar seal ring, etc. arranged in sequence, a complex seal path and a multi-layer seal effect are formed.
It realizes efficient sealing and connection tightness of the cylinder, ensures smooth and reliable long-term use, simplifies structural design, and reduces maintenance difficulty.
Smart Images
Figure CN222991836U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a cylinder, in particular to a cylinder movable valve rod structure. Background Art
[0002] A cylinder refers to a cylindrical metal part that guides a piston to perform linear reciprocating motion in the cylinder. Air converts thermal energy into mechanical energy through expansion in the engine cylinder; gas is compressed by the piston in the compressor cylinder to increase pressure. The housings of turbines, rotary piston engines, etc. are usually also called "cylinders". Application fields of cylinders: printing (tension control), semiconductors (spot welders, chip grinding), automatic control, robots, etc. For cylinders, the sealing condition is more stringent under high-pressure conditions, and there are also higher requirements for the integrity and smoothness of the internal gas path flow structure layout. The traditional structure is too complex with many components, and it is inconvenient to identify defects and perform maintenance after long-term use. Content of the Utility Model
[0003] Aiming at the deficiencies of the existing technology, the utility model provides a cylinder movable valve rod structure.
[0004] In order to achieve the above object, the technical solution adopted by the utility model is: a cylinder movable valve rod structure, including a valve cover, a front valve seat, a valve body, a rear valve seat connected in sequence, and a valve rod that moves in its inner cavity. The valve cover and the front valve seat have a front sealing cavity at the position of the valve rod. The front sealing cavity is provided with a first oil seal, a pressure seat, and a second oil seal arranged in sequence. The valve cover is provided with a first sealing ring on the axial end face facing the front valve seat. The front valve seat and the rear valve seat have a connecting part at the end for the valve body to be embedded and sleeved. A second sealing ring is provided at the connecting part. The valve body has a middle sealing cavity at the position of the valve rod, and the valve rod is also provided with a valve sleeve and a spring for elastically resetting the valve sleeve in the middle sealing cavity. The valve sleeve is provided with a double-directional sealing ring and a flat sealing ring on the side surface in contact with the middle sealing cavity. The valve sleeve is provided with a protruding clamping part on the radial inner side. The valve rod has a positioning part corresponding to the clamping part. The diameter of the positioning part is smaller than the two axial ends of the valve rod, and the valve rod is provided with a positioning nut connected by threads at the end close to the rear valve seat. The clamping part is clamped and fixed at the positioning part through the valve rod and the positioning nut. The rear valve seat has a rear sealing cavity corresponding to the positioning nut at the position of the valve rod. The front valve seat and the rear valve seat are provided with openings on the radial side surfaces to communicate the front sealing cavity and the rear sealing cavity. The front sealing cavity, the middle sealing cavity, and the rear sealing cavity are also communicated in sequence.
[0005] The pressure seat has an L-shaped structure. The middle section of the front sealing cavity is adapted to the shape and size of the pressure seat. The first oil seal has a protruding positioning part at the cavity opening of the front sealing cavity close to the valve cover.
[0006] The double-directional sealing ring has trapezoidal grooves at both axial ends, a V-shaped groove on the radial inner side, and a protruding hemispherical protrusion on the radial outer side.
[0007] The valve stem is provided with a third sealing ring on the side surface in contact with the valve sleeve, and the first sealing ring, the second sealing ring and the third sealing ring are all O-shaped sealing rings.
[0008] There is a gap between the wall of the front sealing cavity and the valve stem, and between the wall of the rear sealing cavity and the positioning nut.
[0009] The beneficial effects of the present utility model: The cylinder movable valve stem structure provided by the present utility model adopts a double guarantee of the combination of labyrinth seal and sealing parts. The overall design is simple and efficient, enhancing the sealing performance and connection tightness, and ensuring the smoothness and reliability of long-term use. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 is a schematic structural diagram of the present utility model;
[0011] Figure 2 is a schematic structural diagram of the first oil seal of the present utility model;
[0012] Figure 3 is a schematic structural diagram of the double-directional sealing ring of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0013] As Figures 1 - 3 shown, a cylinder movable valve stem 5 structure includes a valve cover 1, a front valve seat 2, a valve body 3, a rear valve seat 4 connected in sequence, and a valve stem 5 sleeved in its inner cavity to act. The valve cover 1 and the front valve seat 2 have a front sealing cavity 6 at the valve stem 5. The front sealing cavity 6 is provided with a first oil seal 7, a pressure seat 8 and a second oil seal 9 arranged in sequence, which can effectively prevent the lubricating oil from leaking out at the relatively front end and can also ensure the sealing performance. The pressure seat 8 is in an L-shaped structure, and the middle section of the front sealing cavity 6 is adapted to the shape and size of the pressure seat 8. The first oil seal 7 has a protruding positioning portion 10 at the cavity opening of the front sealing cavity 6 near the valve cover 1. The shape design of the pressure seat 8 forms the characteristics of labyrinth seal, that is, the medium reaches the sealing effect through a tortuous and continuous path. The first oil seal 7 and the second oil seal 9 have V-shaped grooves 11 at one axial end, corresponding to the direction of lubricating oil leakage. At the same time, in this embodiment, the radial inner side of the first oil seal 7 is in an arc shape. Corresponding to the shape of the first oil seal 7 and to make up for the dynamic seal at the front sealing cavity 6, the positioning portion 10 is designed to strengthen the positioning of the first oil seal 7 and the sealing effect at this place.
[0014] The valve cover 1 is provided with a first sealing ring 12 on the axial end surface on the side facing the front valve seat 2. The front valve seat 2 and the rear valve seat 4 have a connecting portion 13 for the valve body 3 to be embedded and sleeved at the end. The connecting portion 13 is provided with a second sealing ring 14 to enhance the sealing performance on each connecting surface. The connecting portion 13 is a section with a relatively small diameter, which also plays the role of labyrinth seal, and at the same time reduces the axial vibration to avoid excessive influence on the connection of components.
[0015] The valve body 3 has a middle sealing cavity 15 at the valve stem 5, and the valve stem 5 is also provided with a valve sleeve 16 and a spring 17 for elastically resetting the valve sleeve 16 in the middle sealing cavity 15. The use of the valve sleeve 16 can change the basic airflow direction and further improve the sealing performance through an obvious turning path. The spring 17 plays a damping effect and can also be elastically reset to one side according to the use needs, which will not be elaborated and limited in detail here.
[0016] The valve sleeve 16 is provided with a bidirectional sealing ring 18 and a flat sealing ring 19 on the side in contact with the middle sealing chamber 15. The bidirectional sealing ring 18 has trapezoidal grooves 20 at both ends in the axial direction, and the bidirectional sealing ring 18 has a V-shaped groove 11 on the radial inner side, and the bidirectional sealing ring 18 has a protruding hemispherical protrusion 21 on the radial outer side. The bidirectional sealing ring 18 forms an effective resistance to the bidirectional gas flow impact through the V-shaped groove 11, and the bidirectional sealing ring 18 elastically abuts in the radial direction, and uses the hemispherical protrusion 21 to guide the airflow, and can be instantly connected when the pressure exceeds the limit. The flat sealing ring 19 has a planar sealing effect through a longer flow path. This is a basic sealing structure and will not be elaborated or limited in detail here.
[0017] The valve sleeve 16 is provided with a protruding clamping portion 22 on the radial inner side, and the valve stem 5 has a positioning portion 10 corresponding to the clamping portion 22. The diameter of the positioning portion 10 is smaller than the axial ends of the valve stem 5, and the valve stem 5 is provided with a threaded positioning nut 23 at one end close to the rear valve seat 4. The clamping portion 22 is clamped and fixed at the positioning portion 10 by the valve stem 5 and the positioning nut 23. The valve stem 5 is provided with a third sealing ring 24 on the side in contact with the valve sleeve 16, and the first sealing ring 12, the second sealing ring 14 and the third sealing ring 24 are all O-rings. Clamping the valve sleeve 16 by the valve stem 5 and the positioning nut 23 at the end is conducive to the linkage action in the axial direction, and cooperates with the third sealing ring 24 to ensure the sealing and connection tightness, and is also convenient for adjustment.
[0018] The rear valve seat 4 has a rear sealing cavity corresponding to the positioning nut 23 at the valve stem 5, and the front valve seat 2 and the rear valve seat 4 are provided with openings on the radial side surfaces that connect the front sealing cavity 6 and the rear sealing cavity, and the front sealing cavity 6, the middle sealing cavity 15 and the rear sealing cavity are also connected in sequence. There is a gap between the cavity wall of the front sealing cavity 6 and the valve stem 5, and between the cavity wall of the rear sealing cavity and the positioning nut 23, which is conducive to the smooth flow of the gas medium and does not affect the action of the valve stem 5.
[0019] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. At the same time, the basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art of this industry should understand.
Claims
1. A cylinder movable valve stem structure, comprising a valve cover, a front valve seat, a valve body, a rear valve seat and a valve stem inserted into the inner cavity thereof, which are connected in sequence, characterized in that: The valve cover and the front valve seat have a front sealing cavity at the valve stem, and the front sealing cavity is provided with a first oil seal, a pressure seat and a second oil seal arranged in sequence. The valve cover is provided with a first sealing ring on the axial end face facing the front valve seat. The front valve seat and the rear valve seat have a connecting portion for the valve body to be embedded and sleeved at the end, and a second sealing ring is provided at the connecting portion. The valve body has a middle sealing cavity at the valve stem, and the valve stem is also provided with a valve sleeve and a spring for elastically resetting the valve sleeve in the middle sealing cavity. The valve sleeve is provided with a two-way sealing ring and a flat spring on the side contacting with the middle sealing cavity. A face sealing ring, the valve sleeve is provided with a protruding clamping portion on the radial inner side, the valve stem has a positioning portion corresponding to the clamping portion, the diameter of the positioning portion is smaller than the axial ends of the valve stem, and the valve stem is provided with a threaded positioning nut at one end close to the rear valve seat, the clamping portion is clamped and fixed at the positioning portion by the valve stem and the positioning nut, the rear valve seat has a rear sealing cavity corresponding to the positioning nut at the valve stem, the front valve seat and the rear valve seat are provided with openings connecting the front sealing cavity and the rear sealing cavity on the radial side surfaces, and the front sealing cavity, the middle sealing cavity and the rear sealing cavity are also connected in sequence.
2. A cylinder movable valve stem structure as claimed in claim 1, characterized in that: The pressure seat is in an L-shaped structure, the middle section of the front sealing cavity is compatible with the shape and size of the pressure seat, and the first oil seal has a protruding positioning portion near the cavity opening of the front sealing cavity of the valve cover.
3. A cylinder movable valve stem structure as claimed in claim 1 or 2, characterized in that: The two-way sealing ring has trapezoidal grooves at both ends in the axial direction, the two-way sealing ring has a V-shaped groove on the radial inner side, and the two-way sealing ring has a protruding hemispherical protrusion on the radial outer side.
4. A cylinder movable valve stem structure as claimed in claim 3, characterized in that: The valve stem is provided with a third sealing ring on the side contacting the valve sleeve, and the first sealing ring, the second sealing ring and the third sealing ring are all O-type sealing rings.
5. A cylinder movable valve stem structure as claimed in claim 4, characterized in that: There is a gap between the front sealing chamber wall and the valve stem, and between the rear sealing chamber wall and the positioning nut.