High-stability rodless cylinder piston main sealing element

Abstract

The utility model relates to the technical field of rodless cylinders, in particular to a high-stability rodless cylinder piston main sealing element which comprises a sealing element body with a Y-shaped cross section, and the sealing element body is divided into a first Y-shaped lip section and a second Y-shaped lip section in the circumferential direction. The first Y-shaped lip section is in a positive circumference shape accounting for 3 / 4-7 / 8 of the circumference, an inner lip of the second Y-shaped lip section is in a positive circumference shape, and an outer lip of the second Y-shaped lip section is in a non-positive circumference shape. The rodless air cylinder has the advantage that the sealing performance and the stability performance of the rodless air cylinder are improved.

Description

Technical Field

[0001] This application relates to the technical field of rodless cylinders, and in particular to a highly stable piston main seal for rodless cylinders. Background Technology

[0002] In the field of industrial automation, cylinders are an important actuator and are widely used in various mechanical equipment to achieve linear reciprocating motion.

[0003] As a special type of cylinder, the rodless cylinder works by using a piston directly or indirectly connected to an external actuator, which then drives the actuator to reciprocate along with the piston. Compared to traditional standard cylinders, the biggest advantage of the rodless cylinder is its efficient use of installation space, significantly saving space resources. This characteristic makes it highly favored in space-constrained industrial equipment and automated production lines. Rodless cylinders are mainly divided into two types: magnetic coupler rodless cylinders (magnetic cylinders) and mechanical rodless cylinders.

[0004] Compared to standard cylinders, rodless cylinders exhibit many unique characteristics. From a space-occupying perspective, rodless cylinders have a compact overall installation size and require less axial space. Actual calculations show that they save approximately 40% of space compared to standard cylinders. This allows rodless cylinders to be more flexibly adapted to production environments with tight layouts.

[0005] Furthermore, the rodless cylinder features a unique structural design, eliminating the need for complex anti-rotation mechanisms and simplifying the overall structure. In terms of stroke, when the cylinder diameter is ≥40mm, the maximum stroke of the rodless cylinder can reach 7m, meeting the needs of some special applications requiring longer strokes.

[0006] However, rodless cylinders have also revealed some obvious drawbacks in practical applications.

[0007] First, its sealing performance is poor, and external leakage is prone to occur during long-term operation. Second, the load-bearing capacity of rodless cylinders is relatively small. When facing large load demands, rodless cylinders alone are insufficient to meet the working requirements, and they often need to be used in conjunction with a guiding mechanism, which undoubtedly increases the overall cost and structural complexity of the equipment. Utility Model Content

[0008] In order to improve the sealing performance and stability of rodless cylinders, this application provides a highly stable piston main seal for rodless cylinders.

[0009] This application provides a highly stable rodless cylinder piston main seal, which adopts the following technical solution:

[0010] A highly stable rodless cylinder piston main seal includes a seal body with a Y-shaped cross-section. The seal body is divided into a first Y-shaped lip segment and a second Y-shaped lip segment around the circumference. The first Y-shaped lip segment is a perfect circle occupying 3 / 4 to 7 / 8 of the circumference. The inner lip of the second Y-shaped lip segment is a perfect circle, and the outer lip is a non-perfect circle.

[0011] In one embodiment: reinforcing ribs are provided in the Y-shaped openings at both ends of the second Y-shaped lip segment.

[0012] In one embodiment, the thickness of the reinforcing rib gradually decreases along the protrusion direction.

[0013] In one embodiment, a positioning protrusion is provided on the back side of the second Y-shaped lip segment.

[0014] In one embodiment: the cross-section of the inner lip of the sealing body is arranged as a straight surface and an inclined surface in sequence along the Y-shaped opening direction.

[0015] In one embodiment, the outer lip of the sealing body is provided with a multi-segment wavy lip.

[0016] In one embodiment, the inner and outer lips of the sealing body are configured with an arc-shaped contact surface structure.

[0017] In one embodiment: the opening amount of the Y-shaped opening of the second Y-shaped lip segment is 2 / 3 to 4 / 5 of the opening amount of the Y-shaped opening of the first Y-shaped lip segment.

[0018] In one embodiment, the outer lip of the sealing body tilts outward at a greater angle than the inner lip tilts inward.

[0019] In summary, this application has the following beneficial effects:

[0020] 1. By using a non-circular second Y-shaped lip section design, the opening of the second Y-shaped lip section is reduced, increasing its ability to deform under stress. Thus, placing the lip of the second Y-shaped lip section at the location subjected to eccentric load pressure increases the load-bearing capacity and effectively improves stability. Simultaneously, the larger opening of the second Y-shaped lip section enhances the initial sealing force in this area, ensuring the sealing effect of the seal.

[0021] 2. The addition of reinforcing ribs provides support and further enhances the load-bearing capacity.

[0022] 3. The special inner and outer lip design further improves installation stability and sealing. Attached Figure Description

[0023] Figure 1This is a front structural schematic diagram of the high-stability rodless cylinder piston main seal of this embodiment;

[0024] Figure 2 This is a front view of the high-stability rodless cylinder piston main seal of this embodiment;

[0025] Figure 3 This is a schematic diagram of the back structure of the high-stability rodless cylinder piston main seal in this embodiment;

[0026] Figure 4 This is a side sectional view of the high-stability rodless cylinder piston main seal of this embodiment.

[0027] In the figure, 100 is the sealing body; 110 is the inner lip; 111 is the straight surface; 112 is the inclined surface; 120 is the outer lip; 130 is the arc contact surface structure; 200 is the first Y-shaped lip segment; 300 is the second Y-shaped lip segment; 400 is the reinforcing rib; and 500 is the positioning protrusion. Detailed Implementation

[0028] The present application will be further described in detail below with reference to the accompanying drawings.

[0029] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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.

[0030] A highly stable rodless cylinder piston main seal, such as Figure 1 As shown, the sealing body 100 has a Y-shaped cross-section. The sealing body 100 is generally annular and is connected by the tail of the inner lip 110 and the outer lip 120 to form a Y shape. The side where the opening end of the Y shape is located is the front side of the sealing body 100, and the other side is the back side of the sealing body 100.

[0031] Combined with appendix Figure 2 The sealing body 100 is divided into a first Y-shaped lip segment 200 and a second Y-shaped lip segment 300 in the circumferential direction. The first Y-shaped lip segment 200 is a perfect circle occupying 3 / 4 to 7 / 8 of the circumference. The inner lip 110 of the second Y-shaped lip segment 300 is a perfect circle and the outer lip 120 is a non-perfect circle.

[0032] Furthermore, the amount of opening formed between the inner lip 110 and the outer lip 120 of the second Y-shaped lip segment 300, as well as the width of the second Y-shaped lip segment 300, also needs to be considered. Therefore, the opening amount of the Y-shaped opening of the second Y-shaped lip segment 300 is 2 / 3 to 4 / 5 of the opening amount of the Y-shaped opening of the first Y-shaped lip segment 200. This arrangement, through a flattened design, reduces the opening amount of the second Y-shaped lip segment 300, increases its ability to withstand deformation, and automatically compensates for the sealing performance through the deformation of the outer lip 120. Therefore, the second Y-shaped lip segment 300 is positioned under eccentric load pressure during installation, effectively improving its load-bearing capacity.

[0033] Based on the above requirements, the proportion of the second Y-shaped lip segment 300 on the entire circumference is preferably 50~65°. In this way, the circumferential length of the first Y-shaped lip segment 200 can also be larger. Through the relatively larger opening of the first Y-shaped lip segment 200, the initial sealing force in this area is improved, ensuring the sealing effect of the seal.

[0034] Reference Figure 2 and Figure 4 The second Y-shaped lip segment 300 has reinforcing ribs 400 inside the Y-shaped openings at both ends to provide better support. The two ends of the reinforcing ribs 400 are connected to the inner lip 110 and outer lip 120 of the second Y-shaped lip segment 300, and the protrusion height of the reinforcing ribs 400 is flush with the front of the sealing body 100.

[0035] Meanwhile, in order to reduce the impact on the contact position of the inner lip 110 and the outer lip 120 and avoid excessive impact on the deformation of the inner lip 110 and the outer lip 120, the thickness of the reinforcing rib 400 is gradually reduced along the protrusion direction.

[0036] Reference Figure 3 The second Y-shaped lip section 300 has a positioning protrusion 500 on its back. The positioning protrusion 500 is a rectangular boss located in the center of the second Y-shaped lip section 300. It is used to cooperate with the mounting groove for positioning, so as to achieve stable installation and ensure the position of the seal relative to the cylinder.

[0037] Reference Figure 4 The inner lip 110 of the sealing body 100 has a cross-section consisting of a straight surface 111 and an inclined surface 112 along the Y-shaped opening direction, wherein the inclined surface 112 is inclined towards the inside of the sealing body 100. This arrangement can increase the installation stability between the inner side and the groove.

[0038] The outer lip 120 of the sealing body 100 adopts a multi-segment wavy lip design, that is, the outer lips 120 of the first Y-shaped lip segment 200 and the second Y-shaped lip segment 300 both adopt a multi-segment wavy lip design. This reduces the contact area of ​​the lips, lowers the starting pressure, and can also compensate for the wear of the sealing element under lateral loads, further improving the sealing performance.

[0039] The inner lip 110 and outer lip 120 of the sealing body 100 are both provided with an arc-shaped contact surface structure 130 to improve the ability to seal against gas.

[0040] The outer lip 120 of the sealing body 100 tilts outward at a greater angle than the inner lip 110 tilts inward.

[0041] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high stability rodless cylinder piston primary seal characterized by: The sealing body (100) includes a Y-shaped cross-section. The sealing body (100) is divided into a first Y-shaped lip segment (200) and a second Y-shaped lip segment (300) in the circumferential direction. The first Y-shaped lip segment (200) is a perfect circle occupying 3 / 4 to 7 / 8 of the circumference. The inner lip (110) of the second Y-shaped lip segment (300) is a perfect circle, and the outer lip (120) is a non-perfect circle.

2. The high stability rodless air cylinder piston primary seal of claim 1, wherein: The two ends of the second Y-shaped lip segment (300) are provided with reinforcing ribs (400).

3. The high stability rodless air cylinder piston primary seal of claim 2, wherein: The thickness of the reinforcing rib (400) gradually decreases along the protrusion direction.

4. The high stability rodless air cylinder piston primary seal of claim 1 or 2 or 3, characterized by: The second Y-shaped lip segment (300) has a positioning protrusion (500) on its back.

5. The high stability rodless air cylinder piston primary seal of claim 1, wherein: The inner lip (110) of the sealing body (100) has a cross-section that is set as a straight surface (111) and an inclined surface (112) along the Y-shaped opening direction.

6. The high stability rodless air cylinder piston primary seal of claim 1, wherein: The outer lip (120) of the sealing body (100) adopts a multi-segment wavy lip design.

7. The high stability rodless air cylinder piston primary seal of claim 1 or 5 or 6, characterized by: The inner and outer lips (120) of the sealing body (100) are provided with an arc-shaped contact surface structure (130).

8. The high stability rodless air cylinder piston primary seal of claim 1, wherein: The opening amount of the Y-shaped opening of the second Y-shaped lip segment (300) is 2 / 3 to 4 / 5 of the opening amount of the Y-shaped opening of the first Y-shaped lip segment (200).

9. The high stability rodless air cylinder piston primary seal of claim 1, wherein: The outer lip (120) of the sealing body (100) tilts outward at a greater angle than the inner lip (110) tilts inward.

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