Anti-extrusion low-friction pneumatic dustproof sealing structure

Abstract

The utility model discloses an anti-extrusion low-friction pneumatic dustproof sealing structure, which is characterized by comprising a sealing element and a groove for mounting the sealing element in a cylinder, the sealing piece comprises a base ring and a lip, the lip is located on the inner side wall of the outer end of the base ring and is obliquely arranged outwards in the axial direction of the sealing piece, and a clamping groove is formed in the outer side wall of the outer end of the base ring; the outer groove wall of the groove is clamped in the clamping groove, and the inner diameter of the inner groove wall of the groove is smaller than the inner diameter of the base ring and larger than the inner diameter of the lip. According to the utility model, the lip is of an inclined structure, so that the contact surface can be increased, and the starting friction force is reduced; the clamping groove in the outer side wall of the outer end of the base ring can be clamped with the outer groove wall of the groove, so that the stability of the base ring in the groove is improved, and the problem that the sealing ring is overturned and extruded out is solved; the inner diameter of the inner groove wall of the groove is smaller than that of the base ring, the depth of the groove is larger than the thickness of the base ring, the contact area of the sealing piece and the piston rod can be reduced, and the service life of the sealing piece is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of sealing, in particular to an anti-extrusion and low-friction pneumatic dustproof sealing structure. Background Art

[0002] Pneumatic dust seals are an indispensable component of cylinders. With the rapid development of cylinders, market demands for higher precision are increasing. Cylinders are gradually moving towards smaller size and higher precision, and with this, the requirements for supporting seals are also increasing. As the outermost sealing structure of the cylinder, the stability of the dust seal affects the operation of the entire pneumatic system. Cylinders operate at relatively slow speeds and require limited installation space. The main operating characteristics of dust seals are low starting friction, stable installation in the groove within the limited space, and resistance to extrusion, while also ensuring a tight seal against the gas.

[0003] In the pneumatic dustproof sealing structure of the existing technology, there is always a gap between the conventional dustproof seal and the groove, which makes the product easy to flip or enter impurities during the continuous peristalsis process, so further improvement is needed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an anti-extrusion and low-friction pneumatic dustproof sealing structure.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An anti-extrusion and low-friction pneumatic dustproof sealing structure is characterized by comprising a sealing member and a groove in a cylinder for mounting the sealing member;

[0007] The sealing member includes a base ring and a lip, wherein the lip is located on the inner side wall of the outer end of the base ring and is arranged to be inclined outward along the axial direction of the sealing member, and a clamping groove is provided on the outer side wall of the outer end of the base ring;

[0008] The outer groove wall of the groove is engaged in the clamping groove, and the inner diameter of the inner groove wall of the groove is smaller than the inner diameter of the base ring and larger than the inner diameter of the lip.

[0009] Preferably, the thickness of the lip increases gradually from the outside to the inside.

[0010] Preferably, the inner wall of the outer end of the lip is a rounded structure.

[0011] Preferably, the lip includes an inner sealing section and an outer sealing section, and the inclination angle between the inner wall of the inner sealing section and the axis is greater than the inclination angle between the inner wall of the outer sealing section and the axis.

[0012] The advantages of the utility model are:

[0013] 1. The lip is an inclined structure, which is easy to elastically deform to increase the contact surface with the piston rod and squeeze the base ring to fit closely with the groove, achieving an effective sealing effect and reducing starting friction;

[0014] 2. The groove on the outer wall of the outer end of the base ring can engage with the outer wall of the groove, which improves the stability of the base ring in the groove and prevents the sealing ring from turning over and extruding;

[0015] 3. The inner diameter of the groove wall is smaller than the inner diameter of the base ring, so that the depth of the groove is greater than the thickness of the base ring, which can reduce the contact area between the seal and the piston rod and increase the service life of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the sealing member provided in this embodiment;

[0017] Figure 2 This is a schematic diagram of the anti-extrusion, low-friction pneumatic dustproof sealing structure provided in this embodiment. DETAILED DESCRIPTION

[0018] Combine Figures 1 to 2 The utility model is further described with respect to the anti-extrusion and low-friction pneumatic dustproof sealing structure.

[0019] An anti-extrusion, low-friction pneumatic dustproof sealing structure is characterized by comprising a seal 1 and a groove 21 in the cylinder for installing the seal 1. The groove 21 is located on the inner wall of the cylinder body 2 corresponding to the inlet and outlet of the piston rod 3.

[0020] The seal 1 is an annular structure, comprising a base ring 11 and a lip 12. The lip 12 is located on the inner sidewall of the outer end of the base ring 11 and is tilted outward along the axial direction of the seal 1. A retaining groove 111 is formed on the outer sidewall of the outer end of the base ring 11. The outer groove wall 211 of the groove 21 engages with the retaining groove 111. The inner diameter of the inner groove wall 212 of the groove 21 is smaller than the inner diameter of the base ring 11 and larger than the inner diameter of the lip 12. This makes the thickness of the base ring 11 smaller than the depth of the groove 21, allowing the base ring 11 to be hidden in the groove 21. At the same time, the lip 12 is located outside the groove 21 and cooperates with the piston rod 3 to achieve a sealing effect.

[0021] The thickness of the lip 12 increases gradually from the outside to the inside, so that the squeezing force of the lip 12 on the piston rod 3 increases with the increase in the deformation amount, thereby achieving an effective sealing effect.

[0022] The inner wall of the outer end of the lip 12 is a rounded structure 1211, which can reduce the contact area between the outer end wall of the lip 12 and the piston rod 3, avoiding the problem of the outer end of the lip 12 being pulled inward when the piston rod 3 retracts.

[0023] The lip 12 includes an inner sealing segment 122 and an outer sealing segment 121, which are arranged along its extension. The inclination angle B between the inner wall of the inner sealing segment 122 and the axis is greater than the inclination angle A between the inner wall of the outer sealing segment 121 and the axis. The inclination angle A between the inner wall of the outer sealing segment 121 and the axis is smaller, so that after deformation, it can easily conform to and seal with the outer wall of the piston rod 3. At the same time, the thickness of the outer sealing segment 121 is smaller than that of the inner sealing segment 122, so the outer sealing segment 121 is easy to deform. The interference fit between the outer sealing segment 121 and the piston rod 3 provides the primary sealing function and also provides effective dust scraping capability. The inner sealing segment 122 connects and supports the outer sealing segment 121. When the piston rod 3 encounters a large impact force, the inner sealing segment 122 deforms to provide a buffering and sealing effect.

[0024] During specific use, the lip 12 has an inclined structure, which is easy to elastically deform to increase the contact area with the piston rod 3 and squeeze the base ring 11 to fit closely with the inner wall of the groove 21, thereby achieving an effective sealing effect and reducing the starting friction; the groove 111 on the outer side wall of the outer end of the base ring 11 can be engaged with the outer groove wall 211 of the groove 21, thereby improving the stability of the base ring 11 in the groove 21 and preventing the seal from being flipped and extruded during the movement of the piston rod 3; the inner diameter of the inner groove wall 212 of the groove 21 is smaller than the inner diameter of the base ring 11, so that the depth of the groove 21 is greater than the thickness of the base ring 11, which can avoid contact between the base ring 11 and the piston rod 3, thereby improving the service life of the seal 1 and reducing the possibility of the seal 1 being squeezed out of the groove 21.

[0025] Unless otherwise specified, in this utility model, if there are terms such as "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicating orientation or positional relationships, they are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model 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 operate in a specific orientation. Therefore, the terms describing the orientation or positional relationships in this utility model are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, they can understand the specific meanings of the above terms in conjunction with the accompanying drawings and according to specific circumstances.

[0026] Unless otherwise specified or limited, the terms "disposed," "connected," and "connected" in this utility model should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0027] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An anti-extrusion, low-friction pneumatic dustproof sealing structure, characterized by: including a seal and a groove in the cylinder for mounting the seal; The sealing member includes a base ring and a lip, wherein the lip is located on the inner side wall of the outer end of the base ring and is arranged to be inclined outward along the axial direction of the sealing member, and a clamping groove is provided on the outer side wall of the outer end of the base ring; The outer groove wall of the groove is engaged in the clamping groove, and the inner diameter of the inner groove wall of the groove is smaller than the inner diameter of the base ring and larger than the inner diameter of the lip.

2. The anti-extrusion low-friction pneumatic dustproof sealing structure according to claim 1 is characterized by: The thickness of the lip gradually increases from the outside to the inside.

3. The anti-extrusion low-friction pneumatic dustproof sealing structure according to claim 1 is characterized by: The inner wall of the outer end of the lip is a rounded structure.

4. The anti-extrusion low-friction pneumatic dustproof sealing structure according to claim 1 is characterized by: The lip includes an inner sealing section and an outer sealing section, and the inclination angle between the inner wall of the inner sealing section and the axis is greater than the inclination angle between the inner wall of the outer sealing section and the axis.

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