Labyrinth type sealing structure of hollow rotary oil cylinder
By combining a labyrinth seal structure and an O-ring, the problem of liquid entering the hydraulic rotary cylinder during high-speed operation is solved, achieving good sealing effect and equipment stability.
Patent Information
- Application Number
- CN202423275053.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-30
AI Technical Summary
When existing hydraulic rotary cylinders operate at high speeds, the sealing structure cannot effectively prevent liquid from entering, leading to oil emulsification and affecting the normal operation of the equipment.
It adopts a labyrinth sealing structure, which includes a combination of T-shaped structure and labyrinth groove, combined with an O-ring and screw-fixed valve body, and uses centrifugal force to discharge liquid, thereby enhancing the sealing effect.
It improves the sealing effect, prevents liquid from entering the oil cylinder, extends the service life of the equipment, and ensures the safety and stability of the equipment.
Smart Images
Figure CN223536659U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a rotary cylinder, and more specifically, to a labyrinth seal structure for a hollow rotary cylinder. Background Technology
[0002] Hydraulic rotary cylinders are tightly assembled components that use hydraulic pressure to generate high tensile force within a small space. They are widely used in machine tools and are easy to operate. However, in current processing and production, some liquid can enter the cylinder through gaps, causing oil and water to mix and resulting in oil emulsification, which affects the normal operation of the equipment.
[0003] To prevent liquid from entering the cylinder, a dynamic seal structure is usually used. However, during normal use, if there is a lot of liquid splashing outside the cylinder, the sealing effect of this seal structure is poor, so a new seal structure is needed to prevent liquid from entering. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a labyrinth-type sealing structure for a hollow rotary hydraulic cylinder that has a good sealing effect and can prevent liquid from entering while the hydraulic cylinder is running at high speed.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a labyrinth-type sealing structure for a hollow rotary cylinder, comprising an outer shell and a lower cover plate, wherein a piston rod is provided inside the lower cover plate, and a valve body is provided at the lower end of the lower cover plate. The lower cover plate rotates within the outer shell, and a sealing structure is provided between the lower cover plate and the outer shell. The sealing structure includes a T-shaped structure disposed within the lower cover plate, and a labyrinth groove matching the T-shaped connector is provided within the outer shell.
[0006] The present invention is further configured such that: the outer shell is provided with a sealing groove, the sealing groove being used to install an O-ring.
[0007] The present invention is further configured such that: a plurality of O-rings are provided between the valve body and the outer shell, and a plurality of bearings are provided on the valve body, and the lower cover plate rotates relative to the outer shell and the valve body through the bearings.
[0008] The present invention is further configured such that: a second sealing groove is provided at the lower end of the connecting groove of the outer shell, and the depth ratio of the second sealing groove to the depth of the connecting groove is 2:1.
[0009] The present invention is further configured such that the valve body and the outer shell are fixedly connected by positioning screws.
[0010] The present invention is further configured such that: the lower end of the valve body is provided with a valve core and a cylinder, and the cylinder is hollow to accommodate a piston rod.
[0011] The present invention is further configured such that the lower cover plate and the outer shell are dynamically sealed.
[0012] The present invention is further configured such that the T-shaped structure and the labyrinth groove are fitted with a clearance.
[0013] By adopting the above technical solution, the sealing structure between the lower cover plate and the outer shell is set as T-shaped. Compared with the traditional labyrinth sealing structure, it acts as a baffle and an additional labyrinth, preventing external liquids from directly entering the sealing structure. Even if a small amount of liquid enters, it will be discharged under the action of centrifugal force, thus improving the sealing effect.
[0014] Furthermore, to prevent liquid leakage in the cylinder, a sealing groove is installed on the outer casing, and an O-ring is placed in the sealing groove. Since the O-ring has good oil resistance, water resistance, and high-pressure oil resistance, installing an O-ring on the outer casing can further improve the overall sealing performance of the cylinder.
[0015] Meanwhile, by fixing the valve body and the outer shell together with screws, the valve body and the outer shell remain relatively stationary during the overall rotation of the oil cylinder. The positioning accuracy of the outer shell and the valve body is high. Furthermore, the piston rod, valve core and lower cover plate are set as rotating parts, while the outer shell and the valve body are set as fixed parts. Through the gap mating surface in the sealing structure, the water outside the oil cylinder is thrown out of the outer shell by centrifugal force. Attached Figure Description
[0016] Figure 1 This is a cross-sectional view of an embodiment of the labyrinth seal structure of a hollow rotary cylinder according to the present invention.
[0017] Figure 2 This is an enlarged view of section A of an embodiment of the labyrinth seal structure for a hollow rotary cylinder according to this utility model;
[0018] The attached diagram is labeled as follows: 1. Outer shell; 2. Lower cover plate; 3. Piston rod; 4. Valve body; 5. Sealing structure; 6. T-shaped structure; 7. Labyrinth groove; 8. Sealing groove; 9. O-ring seal; 10. Bearing; 11. Oil return groove; 12. Positioning screw; 13. Valve core; 14. Cylinder body. Detailed Implementation
[0019] Reference Figures 1 to 2 The present invention provides a further description of an embodiment of a labyrinth-type sealing structure for a hollow rotary cylinder.
[0020] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0021] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.
[0022] A labyrinth-type sealing structure for a hollow rotary cylinder includes an outer shell 1 and a lower cover plate 2. A piston rod 3 is also provided inside the lower cover plate 2, and a valve body 4 is also provided at the lower end of the lower cover plate 2. The lower cover plate 2 rotates inside the outer shell 1. A sealing structure 5 is provided between the lower cover plate 2 and the outer shell 1. The sealing structure 5 includes a T-shaped structure 6 disposed inside the lower cover plate 2. A labyrinth 7 matching the T-shaped structure 6 is opened inside the outer shell 1.
[0023] By setting the sealing structure 5 between the lower cover plate 2 and the outer shell 1 as a T-shape, compared with the traditional labyrinth sealing structure 5, it acts as a baffle and adds another labyrinth. Furthermore, an oil return groove 11 is set at the lower end of the outer shell 1. The depth ratio of the oil return groove 11 to the depth of the connecting groove 7 is 2:1, which prevents external liquid from directly entering the sealing structure 5. Even if a small amount of liquid enters, it will be discharged under the action of centrifugal force. Moreover, the oil return groove 11 is relatively deep, and a very small amount of liquid entering the oil return groove 11 will gather at the bottom of the oil return groove 11 under the action of centrifugal force, preventing liquid from entering the oil cylinder and improving the sealing effect. In addition, the T-shaped structure 6 and the labyrinth groove 7 are fitted with a clearance, so no wear will occur during the operation of the oil cylinder, improving the safety of equipment operation, preventing liquid from being sucked into the oil cylinder, and extending the service life of the equipment.
[0024] Furthermore, in order to prevent liquid leakage in the cylinder, a sealing groove 8 is installed on the outer shell 1, and an O-ring is set in the sealing groove 8. Several O-rings are also set between the valve body 4 and the outer shell 1. Since the O-ring has good oil resistance, water resistance and high pressure oil resistance, installing O-rings on the outer shell 1 can further improve the overall sealing performance of the cylinder.
[0025] Meanwhile, by fixing the valve body 4 and the outer shell 1 with screws, the valve body 4 and the outer shell 1 remain relatively stationary during the overall rotation of the oil cylinder, and the piston rod 3 moves up and down inside the cylinder 14. The positioning accuracy of the outer shell 1 and the valve body 4 is high. Furthermore, the piston rod 3, the valve core 13 and the lower cover plate 2 are set as rotating parts, and the outer shell 1 and the valve body 4 are set as fixed parts. Through the clearance mating surface in the sealing structure 5, the water outside the oil cylinder is thrown out of the outer shell by the action of centrifugal force.
[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A labyrinth-type sealing structure for a hollow rotary cylinder, comprising an outer shell (1) and a lower cover plate (2), wherein a piston rod (3) is further provided inside the lower cover plate (2), and a valve body (4) is further provided at the lower end of the lower cover plate (2), wherein the lower cover plate (2) rotates within the outer shell (1), characterized in that, A sealing structure (5) is provided between the lower cover plate (2) and the outer shell (1). The sealing structure (5) includes a T-shaped structure (6) disposed in the lower cover plate (2). A labyrinth groove (7) matching the T-shaped structure (6) is provided in the outer shell (1).
2. The labyrinth seal structure for a hollow rotary cylinder according to claim 1, characterized in that, The outer casing (1) is also provided with a sealing groove (8), which is used to install an O-ring seal.
3. The labyrinth seal structure for a hollow rotary cylinder according to claim 1, characterized in that, Several O-rings (9) are provided between the valve body (4) and the outer shell (1). Several bearings (10) are also provided on the valve body (4). The lower cover plate (2) rotates relative to the outer shell (1) and the valve body (4) through the bearings (10).
4. The labyrinth seal structure for a hollow rotary cylinder according to claim 1, characterized in that, The lower end of the labyrinth groove (7) of the outer shell (1) is also provided with a second sealing groove (11), and the depth ratio of the second sealing groove (11) to the depth of the labyrinth groove (7) is 2:
1.
5. The labyrinth seal structure for a hollow rotary cylinder according to claim 1, characterized in that, The valve body (4) and the outer shell (1) are fixedly connected by positioning screws (12).
6. The labyrinth seal structure for a hollow rotary cylinder according to claim 1, characterized in that, The lower end of the valve body (4) is also provided with a valve core (13) and a cylinder (14), the cylinder (14) being hollow inside for placing the piston rod (3).
7. The labyrinth seal structure for a hollow rotary cylinder according to claim 1, characterized in that, The lower cover plate (2) and the outer shell (1) are dynamically sealed.
8. The labyrinth seal structure for a hollow rotary cylinder according to claim 1, characterized in that, The T-shaped structure (6) is fitted with the labyrinth groove (7) with a clearance.