Spiral piston rod structure
By designing a sealing ring cavity and piping system in the helical piston rod structure and utilizing hydraulic oil to expand the sealing ring, the problem of cylinder leakage caused by sealing ring wear was solved, achieving higher sealing performance and thrust stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-27
- Publication Date
- 2026-04-03
AI Technical Summary
The seals of existing helical swing cylinders are prone to wear after long-term use, which leads to a decrease in the sealing effect between the cylinder body and the piston and hydraulic oil leakage.
A helical piston rod structure was designed, including a piston rod, a sealing ring, a cavity, a pipe, and a diaphragm. Hydraulic oil enters the cavity of the sealing ring, causing it to expand and tightly fit the inner wall of the cylinder, reducing leakage, and the gap is sealed by an oil scraper ring.
It effectively reduces hydraulic oil leakage, improves sealing, prevents leakage from gaps caused by wear of the seal ring, and ensures stable piston thrust.
Smart Images
Figure CN224079402U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of piston rod technology, and in particular to a helical piston rod structure. Background Technology
[0002] A helical piston rod is a piston rod with a helical structure and is an important component of a helical oscillating cylinder, a device that uses hydraulic technology to achieve linear rotational motion. It employs a unique design principle that converts hydraulic energy into mechanical energy. It mainly consists of a cylinder body, collar, piston, sealing ring, and piston rod. Figure 1 As shown.
[0003] When a helical oscillating cylinder is in operation, the piston rod is driven to rotate inside the cylinder by a piston that slides and rotates inside the cylinder. As the piston moves inside the cylinder, the outer side of the sealing ring, which is mostly made of rubber and has a ring structure, contacts the inner wall of the cylinder. As the piston moves, the hydraulic oil at the sealing ring will leak to a certain extent because the sealing ring is flexible. However, this does not affect the use of the cylinder.
[0004] However, after long-term use, the sealing ring will wear against the inner wall of the cylinder or the sealing ring will age, resulting in gaps between the sealing ring and the cylinder. This reduces the sealing effect of the sealing ring on the gap between the piston and the cylinder, causing hydraulic oil inside the cylinder to leak from the gap between the piston and the cylinder. Utility Model Content
[0005] To overcome the above deficiencies, this utility model provides a spiral piston rod structure, which aims to improve the problem in the prior art where, as the piston moves inside the cylinder, the sealing ring on the outside of the piston, used to seal the gap between the piston and the cylinder, wears against the inner wall of the cylinder, causing a gap between the sealing ring and the cylinder.
[0006] To achieve the above objectives, this utility model adopts the following technical solution: a spiral piston rod structure, comprising:
[0007] Piston rod, with a piston threadedly connected to its outer side;
[0008] A groove is formed on the outer side of one end of the piston. Through holes are formed on both sides of the sidewall of the groove, and a sealing ring is inserted into the groove.
[0009] A cavity is formed inside the sealing ring. Pipes are fixedly connected to both sides of the cavity sidewall. One end of the pipe is inserted into the through hole to deliver hydraulic oil into the cavity so that the sealing ring can expand.
[0010] A diaphragm is fixedly connected inside the cavity along the radial direction of the sealing ring to separate the cavity.
[0011] As a further description of the above technical solution:
[0012] It also includes a cylinder body, which is installed on the outside of the piston rod. A collar is fixedly connected to the inner wall of the cylinder body, and the collar has an internal thread. The piston is installed inside the cylinder body.
[0013] As a further description of the above technical solution:
[0014] The piston is configured as a cylindrical structure, and an external thread is provided on the outer side of the piston, which is connected to the internal thread.
[0015] As a further description of the above technical solution:
[0016] It also includes two oil scraper rings, both of which are fitted onto the outside of the piston to seal the gap between the cylinder and the piston.
[0017] As a further description of the above technical solution:
[0018] The piston has a groove on its inner sidewall, and a sealing ring is inserted into the groove. The sealing ring is fixedly connected to seal the gap between the piston and the piston rod.
[0019] As a further description of the above technical solution:
[0020] Both ends of the cylinder are provided with oil injection holes for injecting hydraulic oil into the cylinder.
[0021] This utility model has the following beneficial effects:
[0022] In this invention, when the hydraulic oil inside the cylinder pushes the piston to move, some of the hydraulic oil will enter the cavity of the sealing ring through the pipe, causing the sealing ring to expand towards the side wall of the cylinder and squeeze the inner side wall of the cylinder, thereby reducing the leakage of hydraulic oil from the outside of the sealing ring.
[0023] After prolonged use, the sealing ring will wear down against the side wall of the cylinder, creating gaps. When hydraulic oil enters the cavity, it increases the volume of the sealing ring, thus eliminating the gap between the sealing ring and the cylinder and preventing hydraulic oil from leaking between the side wall of the cylinder and the sealing ring. Attached Figure Description
[0024] Figure 1 This is a cross-sectional view of the prior art of this utility model;
[0025] Figure 2 This is a perspective view of the piston rod of this utility model;
[0026] Figure 3 This is a cross-sectional view of the sealing ring of this utility model.
[0027] Legend:
[0028] 1. Cylinder block; 2. Pipeline; 3. Collar; 4. Piston rod; 5. Piston; 6. Sealing ring; 7. Oil scraper ring; 8. Groove; 9. Cavity; 10. Diaphragm. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] Reference Figure 1-3 An embodiment of this utility model is provided: a spiral piston rod structure, including a cylinder body 1, a piston rod 4, and a piston 5 mounted on the piston rod 4. The piston rod 4 is rotatably mounted in the cylinder body 1 and its two ends extend out of the cylinder body 1 as power output ends. The piston 5 is movably mounted inside the cylinder body 1 and contacts the inner side wall of the cylinder body 1. Oil injection holes are provided at both ends of the cylinder body 1.
[0031] One end of the piston rod 4 has an external thread, while the other end is smooth. One end of the inner wall of the piston 5 has an internal thread, and the other end of the inner wall of the piston 5 contacts the smooth surface of the piston rod 4. The outer side of the piston rod 4 and the inner side of the piston 5 are connected by threads. Figure 2 As shown, piston 5 is configured as a cylindrical structure, and an annular groove is provided at the other end of the inner side wall of piston 5, in which a sealing ring is installed.
[0032] When piston 5 slides outside piston rod 4, the sealing ring can seal the gap between piston rod 4 and piston 5 to prevent hydraulic oil from leaking from the gap between piston 5 and piston rod 4 when hydraulic oil pushes piston 5 to slide inside cylinder 1, thus resulting in insufficient thrust of hydraulic oil on piston 5.
[0033] A collar 3 is fixedly installed on the inner wall of the cylinder 1 near the piston 5. The collar 3 has an internal thread on the side near the piston 5, and an external thread on the outside of the piston 5. The outside of the piston 5 and the inside of the collar 3 are connected together by threads.
[0034] When oil enters through one oil injection hole and returns through the other, the hydraulic oil entering the cylinder 1 will push the piston 5 to slide inside the cylinder 1. Under the action of the external thread on the outside of the piston 5 and the internal thread on the inside of the collar 3, the piston 5 will rotate while sliding inside the cylinder 1. When the piston 5 rotates, the piston rod 4 will be pushed to rotate around the axis of the piston rod 4 under the action of the internal thread on the inside of the piston 5.
[0035] A groove 8 is provided on the outer side of one end of the piston 5. Through holes are provided on both sides of the inner wall of the groove 8. A sealing ring 6 is installed inside the groove 8. The sealing ring 6 is a ring structure made of rubber. A cavity 9 is provided inside the sealing ring 6. Pipes 2 are connected to both sides of the inner wall of the cavity 9. The end of the pipe 2 away from the cavity 9 is inserted into the through hole. A diaphragm 10 is fixedly connected inside the cavity 9 along the radial direction of the sealing ring 6. The diaphragm 10 is used to divide the cavity 9 into two independent parts. No matter which end of the cylinder 1 the hydraulic oil is located, the hydraulic oil can enter the cavity and cause the sealing ring 6 to expand towards the side wall of the cylinder 1.
[0036] When installing the sealing ring 6, press down on both sides of the sealing ring 6 at the pipe 2. Because the sealing ring 6 has a cavity inside, when the two sides of the sealing ring 6 are squeezed, the side walls of the sealing ring 6 are squeezed together and the two pipes 2 are brought closer to each other. Then, fit the sealing ring 6 into the groove 8, while ensuring that the pipe 2 is aligned with the through hole, and release the pressure on the side walls of the sealing ring 6. Use the elasticity of the sealing ring 6 itself to push the pipe 2 into the through hole.
[0037] Because the material of the sealing ring 6 is relatively soft, there will be some leakage of hydraulic oil inside the cylinder 1 when the piston 5 moves. When the hydraulic oil inside the cylinder 1 pushes the piston 5 to move, some of the hydraulic oil will enter the cavity 9 through the pipe 2 of the sealing ring 6, so that the sealing ring 6 can expand towards the inner wall of the cylinder 1 and squeeze the inner wall of the cylinder 1, so that the outer side of the sealing ring 6 is tightly fitted with the side wall of the cylinder 1, thereby reducing the leakage of hydraulic oil from the inner wall of the cylinder 1 and the sealing ring 6, and improving the sealing performance of the sealing ring 6.
[0038] When the sealing ring 6 on the outside of the piston 5 wears down due to prolonged use, causing a gap between the sealing ring 6 and the cylinder 1, some of the hydraulic oil inside the cylinder 1 enters the cavity 9 during the process of pushing the piston 5 to move, causing the sealing ring 6 to expand. This eliminates the gap between the sealing ring 6 and the cylinder 1, preventing hydraulic oil from leaking from the gap between the cylinder 1 and the sealing ring 6, thus preventing insufficient thrust of the hydraulic oil on the piston 5.
[0039] The piston 5 is fitted with two oil scraper rings 7, which are located on both sides of the sealing ring 6. When the piston 5 slides inside the cylinder 1, the oil scraper rings 7 can seal the gap between the outer side of the piston 5 and the inner side of the cylinder 1, and at the same time, the oil scraper rings 7 can scrape off the hydraulic oil adhering to the inner wall of the cylinder 1.
[0040] Hydraulic oil is injected into the cylinder 1 through the oil injection hole, pushing the piston 5 to move inside the cylinder 1 and outside the piston rod 4. Under the action of the external thread of the piston 5 and the internal thread of the collar 3, the piston 5 will rotate simultaneously while moving. Under the action of the internal thread of the piston 5 and the external thread of the piston rod 4, the piston rod 4 will rotate around the axis of the piston rod 4. When the hydraulic oil inside the cylinder 1 pushes the piston 5 to move, some of the hydraulic oil will enter the cavity 9 through the pipe 2, allowing the sealing ring 6 to expand towards the inner wall of the cylinder 1, squeezing the inner wall of the cylinder 1, so that the outer side of the sealing ring 6 is tightly fitted with the side wall of the cylinder 1, thereby reducing the leakage of hydraulic oil from the inner wall of the cylinder 1 and the sealing ring 6.
[0041] When the sealing ring 6 on the outside of the piston 5 wears down due to prolonged use, causing a gap between the sealing ring 6 and the cylinder 1, some of the hydraulic oil inside the cylinder 1 enters the cavity 9 during the process of pushing the piston 5 to move, causing the sealing ring 6 to expand. This eliminates the gap between the sealing ring 6 and the cylinder 1, preventing hydraulic oil from leaking from the gap between the cylinder 1 and the sealing ring 6, thus preventing insufficient thrust of the hydraulic oil on the piston 5.
[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A helical piston rod structure, characterized by: Comprising A piston rod (4) is externally threaded with a piston (5); A groove (8) is opened on one end of the piston (5) outside, both sides of the groove (8) side wall are provided with through holes, the groove (8) is inserted with a sealing ring (6); A cavity (9) is opened inside the sealing ring (6), both sides of the cavity (9) side wall are fixedly connected with a pipeline (2), one end of the pipeline (2) is inserted into the through hole, used for conveying hydraulic oil into the cavity (9) inside to make the sealing ring (6) can expand; A diaphragm (10) is fixedly connected inside the cavity (9) along the radial direction of the sealing ring (6), used for separating the cavity (9).
2. A helical piston rod structure according to claim 1, characterized in that: Also comprising a cylinder (1) is installed outside the piston rod (4), the inner wall of the cylinder (1) is fixedly connected with a sleeve ring (3), one side of the sleeve ring (3) is provided with internal thread, the piston (5) is installed inside the cylinder (1).
3. A helical piston rod structure according to claim 2, characterized in that: The piston (5) is provided as a cylindrical structure, the outer side of the piston (5) is provided with external thread, the external thread is connected with the internal thread.
4. A helical piston rod structure according to claim 1, characterized in that: Also comprising two oil scraper rings (7) are sleeved outside the piston (5), used for sealing the gap between the cylinder (1) and the piston (5).
5. A helical piston rod structure according to claim 1, characterized in that: The inner wall of the piston (5) is provided with a slot, the slot is inserted with a sealing ring, used for sealing the gap between the piston (5) and the piston rod (4).
6. A helical piston rod structure according to claim 2, characterized in that: Both ends of the cylinder (1) are provided with oil injection holes, used for injecting hydraulic oil into the cylinder (1) inside.