Novel piston rod seal capable of adjusting clearance through self-adaptive pressure

Abstract

The utility model discloses a novel piston rod seal capable of adjusting a gap in a self-adaptive pressure mode. The novel piston rod seal comprises a hydraulic cylinder. A piston rod is slidably connected in the hydraulic cylinder, a sealing groove is formed in the inner arc face of the hydraulic cylinder, a gasket, a check ring and a sealing ring are slidably connected in the sealing groove and sequentially distributed in the sealing groove from right to left, the check ring is fixedly connected with the sealing ring, and notches are formed in the opposite inner side faces of the gasket and the check ring. According to the novel piston rod seal capable of automatically adapting to the pressure adjusting gap, the sealing component automatically adapts to the high-pressure environment to compensate the gap of the piston rod, and the sealing effect of the piston rod in the high-pressure environment is guaranteed; meanwhile, movement of the piston rod cannot be blocked due to too small gaps under the low-pressure condition, and normal work of the piston rod in the low-pressure environment is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, and particularly to a piston rod seal with a novel self - adaptive pressure - regulating gap. Background Technique

[0002] A hydraulic cylinder is a device that converts hydraulic energy into mechanical energy. It is usually widely used in various hydraulic systems. The main function of a hydraulic cylinder is to provide power and an actuator to drive various machines and equipment to work. The work of a hydraulic cylinder is mainly achieved by driving the piston rod inside it through oil pressure. During the working process, in order to prevent oil pressure from leaking from the gap between the cylinder and the piston rod, a sealing component needs to be installed between the cylinder and the piston rod to block the leakage of hydraulic oil. In the prior art, usually a retaining ring is used to make up for the problem of too large a gap between the piston rod and the hydraulic cylinder to ensure that the Y - shaped ring is not extruded under high - pressure conditions. However, under low - pressure conditions, the gap between the retaining ring and the piston rod is small, which easily hinders the movement of the piston rod and affects the normal operation of the piston rod. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a piston rod seal with a novel self - adaptive pressure - regulating gap. The sealing component automatically adapts to the high - pressure environment to compensate for the gap of the piston rod, ensuring the sealing effect of the piston rod under high - pressure conditions. At the same time, it will not block the movement of the piston rod due to too small a gap under low - pressure conditions, ensuring the normal operation of the piston rod under low - pressure conditions, and can effectively solve the problems in the background technique.

[0004] To achieve the above purpose, the utility model provides the following technical scheme: A piston rod seal with a novel self - adaptive pressure - regulating gap, including a hydraulic cylinder;

[0005] Hydraulic cylinder: A piston rod is slidably connected inside it. The inner arc surface of the hydraulic cylinder is provided with a sealing groove. A washer, a retaining ring, and a sealing ring are respectively slidably connected inside the sealing groove. The washer, the retaining ring, and the sealing ring are distributed in the sealing groove from right to left in sequence. The retaining ring is fixedly connected to the sealing ring. Cuts are provided on the relative inner side surfaces of the washer and the retaining ring. The outer arc surface and the right - hand side surface of the washer are both in contact with the inner wall of the sealing groove. The retaining ring is installed in cooperation with the piston rod. The sealing component automatically adapts to the high - pressure environment to compensate for the gap of the piston rod, ensuring the sealing effect of the piston rod under high - pressure conditions. At the same time, it will not block the movement of the piston rod due to too small a gap under low - pressure conditions, ensuring the normal operation of the piston rod under low - pressure conditions.

[0006] Further, the washer is a metal washer, providing good support and limitation for the work of the retaining ring.

[0007] Further, the retaining ring is a high - molecular material retaining ring, making the retaining ring elastic, capable of deforming under high - pressure conditions and resetting under low - pressure conditions.

[0008] Further, the cross-section of the sealing ring is Y-shaped, which is convenient for applying oil pressure on the sealing ring.

[0009] Further, the cut is a 45-degree inclined cut, which makes the guiding of the retaining ring by the cut smoother.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: The novel piston rod seal with self-adaptive pressure regulating gap has the following advantages:

[0011] Under normal pressure, there is a gap between the inner arc surface of the retaining ring and the piston rod and the gap is large enough not to block the movement of the piston rod. When the pressure in the hydraulic cylinder increases, the oil pressure pushes the retaining ring to move to the right through the Y-shaped sealing ring. Through the guiding of the cut, the retaining ring deforms, reducing the gap between the retaining ring and the piston rod. The greater the pressure, the closer the retaining ring fits with the piston rod, and the stronger the sealing effect. When the pressure in the hydraulic cylinder decreases, due to the elasticity of the retaining ring, the retaining ring will gradually reset, and the sealing component automatically compensates for the gap of the piston rod in the high-pressure environment, ensuring the sealing effect of the piston rod in the high-pressure environment. At the same time, it will not block the movement of the piston rod due to too small a gap under low pressure, ensuring the normal operation of the piston rod in the low-pressure environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the present utility model;

[0013] Figure 2 is a schematic structural diagram of the cut of the present utility model.

[0014] In the figure: 1 hydraulic cylinder, 2 piston rod, 3 washer, 4 retaining ring, 5 sealing ring, 6 cut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0016] Please refer to Figure 1-2 , this embodiment provides a technical solution: A novel piston rod seal with self-adaptive pressure regulating gap, including a hydraulic cylinder 1;

[0017] Hydraulic cylinder 1: A piston rod 2 is slidably connected inside it. The inner arc surface of the hydraulic cylinder 1 is provided with a sealing groove. Inside the sealing groove, a washer 3, a retaining ring 4, and a sealing ring 5 are respectively slidably connected. The washer 3, the retaining ring 4, and the sealing ring 5 are distributed in the sealing groove from right to left in sequence. The retaining ring 4 is fixedly connected to the sealing ring 5. Cutouts 6 are provided on the relative inner side surfaces of the washer 3 and the retaining ring 4. The outer arc surface and the right side surface of the washer 3 are both in contact with the inner wall of the sealing groove. The retaining ring 4 is fitted with the piston rod 2. Under the condition of relatively low pressure, there is a gap between the retaining ring 4 and the piston rod 2 and the gap is large enough not to block the movement of the piston rod 2. When the pressure inside the hydraulic cylinder 1 increases, the oil pressure acts on the left side surface of the sealing ring 5. The sealing ring 5 is used to transfer the acting force to the retaining ring 4, pushing the retaining ring 4 to move to the right. Under the guidance of the cutout 6, the retaining ring 4 clamps the piston rod 2 tightly, reducing the gap between the sealing component and the piston rod 2, making it have better high-pressure resistance. The greater the pressure, the more obvious this effect is. The washer 3 is a metal washer, providing support for the deformation of the retaining ring 4. The retaining ring 4 is a high-molecular material retaining ring, making the retaining ring 4 elastic, capable of deforming under high pressure and automatically resetting under low pressure. The cross-section of the sealing ring 5 is Y-shaped, facilitating the accurate application of the oil pressure on the sealing ring 5. The cutout 6 is a 45-degree inclined cut, making the guidance of the cutout 6 on the retaining ring 4 smoother.

[0018] The working principle of a novel piston rod seal with self-adaptive pressure-regulated clearance provided by the present utility model is as follows: During use, after the retaining ring 4 is installed, there is a gap between the inner arc surface of the retaining ring 4 and the piston rod 2 and the gap is large enough not to block the movement of the piston rod 2. When the pressure inside the hydraulic cylinder 1 increases, the oil pressure acts on the left side surface of the Y-shaped sealing ring 5. The sealing ring 5 is used to transfer the acting force to the retaining ring 4, pushing the retaining ring 4 to move to the right. Under the guidance of the cutout 6, the elastically deformable retaining ring 4 deforms towards the piston rod 2 direction, reducing the gap between the retaining ring 4 and the piston rod 2, making the sealing component have better high-pressure resistance. The greater the pressure, the closer the retaining ring 4 fits with the piston rod 2 and the stronger the sealing effect. When the pressure inside the hydraulic cylinder 1 decreases, due to the elasticity of the retaining ring 4, the retaining ring 4 will gradually reset.

[0019] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present utility model.

Claims

1. A new type of piston rod seal with adaptive pressure - regulating clearance, characterized in that: It includes a hydraulic cylinder (1); Hydraulic cylinder (1): A piston rod (2) is slidably connected inside it. A sealing groove is provided on the inner arc surface of the hydraulic cylinder (1). A washer (3), a retaining ring (4), and a sealing ring (5) are respectively slidably connected inside the sealing groove. The washer (3), the retaining ring (4), and the sealing ring (5) are distributed inside the sealing groove from right to left in sequence. The retaining ring (4) is fixedly connected to the sealing ring (5). Cuts (6) are provided on the relative inner side surfaces of the washer (3) and the retaining ring (4). The outer arc surface and the right side surface of the washer (3) are both in contact with the inner wall of the sealing groove. The retaining ring (4) is installed in cooperation with the piston rod (2).

2. The piston rod seal with a novel self - adaptive pressure - regulating clearance according to claim 1, wherein: The washer (3) is a metal washer.

3. A piston rod seal with a novel self - adaptive pressure - regulating clearance according to claim 1, characterized in that: The retaining ring (4) is a retaining ring made of polymer material.

4. A piston rod seal with a novel self - adaptive pressure - regulating clearance according to claim 1, characterized in that: The cross-section of the sealing ring (5) is Y-shaped.

5. A piston rod seal with a novel self - adaptive pressure - regulating clearance according to claim 1, characterized in that: The cut (6) is a 45-degree inclined cut.

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