Pneumatic sealing oil supplementing device for oil-free lubrication of piston rod

Abstract

The utility model relates to a piston rod oil-free lubrication pneumatic sealing oil recharging device, which comprises a cylinder body shaft seal section and a piston rod, a groove for installing a sealing ring is arranged on the inner hole surface of the cylinder body shaft seal section, the sealing ring is arranged in the groove, an annular inner groove is arranged on the inner ring of the sealing ring, and the piston rod is arranged in the annular inner groove. The two sides of the sealing ring are divided into two first sealing tongue parts through the annular inner groove, an oil inlet hole penetrating in the radial direction is formed in the sealing ring, an oil inlet cup is arranged on the outer side of the shaft sealing section of the cylinder body, and the oil inlet hole is communicated with the oil inlet cup and the annular inner groove. The lubricating grease in the annular inner groove can be added to ensure reliable oil supply when the sealing failure is possibly caused by more oil consumption generated in the operation of the pneumatic sealing element; the service life of the oil-free lubrication pneumatic seal can be prolonged, the reliability of the oil-free lubrication pneumatic seal can be improved, the oil-free lubrication pneumatic seal is simple in structure and convenient to manufacture, and an existing oil-free lubrication pneumatic seal can be conveniently improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing mechanisms, in particular to an oil-free lubricating pneumatic sealing oil replenishing device for a piston rod. Background Art

[0002] Oil-free lubricated pneumatic seals can not only meet the specific requirements of the environment and industry, but also simplify the pneumatic system, and are widely used in actual engineering. At present, oil-free lubricated pneumatic seals mainly use O-shaped grooves to store grease that is added once to lubricate the sealing surface and achieve operation without oil supply. However, in actual use, it is found that the O-shaped grooves after oil storage are well lubricated at the beginning and can achieve the purpose of friction reduction and lubrication. However, after working for a certain period of time, due to the loss of grease, oil supply is often unable to occur, resulting in increased running resistance of the pneumatic piston rod, which in turn leads to severe wear of the mating parts until the seal fails. This is a common problem that needs to be solved urgently. Utility Model Content

[0003] The utility model aims at the deficiencies of the prior art and provides a piston rod oil-free lubrication pneumatic seal oil replenishing device.

[0004] The utility model is realized through the following technical scheme, and provides a piston rod oil-free lubrication pneumatic sealing oil replenishing device, comprising a cylinder shaft sealing section and a piston rod, the inner hole surface of the cylinder shaft sealing section is provided with a groove for installing a sealing ring, the sealing ring is installed in the groove, the inner ring of the sealing ring is provided with an annular inner groove, the annular inner groove separates two sides of the sealing ring into two first sealing tongues, the sealing ring is provided with a radially penetrating oil inlet hole, an oil filling cup is installed on the outer side of the cylinder shaft sealing section, and the oil inlet hole connects the oil filling cup and the annular inner groove.

[0005] Lubricating oil can be injected into the annular inner groove through the oil inlet hole through the oil filling cup, so as to replenish the lubricating oil into the annular inner groove. The annular inner groove separates two first sealing tongues on both sides of the sealing ring, and the two first sealing tongues are fitted with the piston rod to achieve sealing.

[0006] As an optimization, the cross section of the annular inner groove is arc-shaped and the central angle is greater than degrees. A large amount of lubricating oil can be stored inside the annular inner groove in this solution.

[0007] As an optimization, the first sealing tongue portion extends toward the inner ring of the sealing ring. In this solution, the first sealing tongue portion extends toward the inner ring of the sealing ring, and the sealing effect is improved by the elastic deformation of the first sealing tongue portion.

[0008] As an optimization, the inner ring of the sealing ring is provided with an annular second sealing tongue portion, which can realize dust prevention and improve the sealing effect.

[0009] As an optimization, the outer ring of the sealing ring is provided with an annular oil inlet groove, and the oil inlet hole and the oil filling cup are both connected to the oil inlet groove. In this solution, the oil filling cup can inject lubricating oil into the oil inlet groove of the outer ring of the sealing ring, and then enter the annular inner groove of the inner ring of the sealing ring through multiple oil inlet holes.

[0010] As an optimization, a threaded hole is provided in the cylinder shaft seal section, one end of which is connected to the oil filling cup, and the other end is connected to the oil inlet groove. The threaded hole provided in this solution is used to install the oil filling cup.

[0011] As an optimization, the oil inlet holes are provided in multiple numbers and are evenly distributed along the circumference of the sealing ring. In this solution, the multiple oil inlet holes facilitate the oil inlet to each circumferential position of the annular inner groove.

[0012] The beneficial effects of the utility model are as follows: the utility model is a piston rod oil-free lubricated pneumatic seal oil replenishing device. In view of the shortcomings of the existing structure, when the pneumatic seal generates more oil consumption during operation and may cause seal failure, grease can be added to the grease in the annular inner groove to ensure reliable oil supply; the implementation of this patent can improve the service life and reliability of the oil-free lubricated pneumatic seal, has a simple structure, is easy to manufacture, and can conveniently improve the existing oil-free lubricated pneumatic seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a cross-sectional view of the utility model;

[0015] Figure 3 For this utility model Figure 2 Sectional view of the middle AA plane;

[0016] Figure 4 This is a schematic diagram of the sealing ring structure of the utility model;

[0017] Figure 5 This is a cross-sectional view of the sealing ring of the utility model;

[0018] Figure 6 This is a cross-sectional view of the sealing ring of the utility model;

[0019] Figure 7 For this utility model Figure 5 Middle BB plane section view;

[0020] As shown in the figure:

[0021] 1. Cylinder shaft sealing section, 2. Piston rod, 3. Oil filling cup, 4. Sealing ring, 5. Oil inlet hole, 6. Oil inlet groove, 7. Annular inner groove, 8. First sealing tongue, 9. Second sealing tongue. DETAILED DESCRIPTION

[0022] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0023] like Figures 1 to 7 As shown, a piston rod oil-free lubrication pneumatic sealing oil replenishing device of the utility model comprises a cylinder shaft sealing section 1 and a piston rod 2. The inner hole surface of the cylinder shaft sealing section 1 is provided with a groove for installing a sealing ring. The groove is an annular groove arranged on the inner ring of the cylinder shaft sealing section 1, and the cross-section is a rectangular structure. A sealing ring 4 is installed in the groove. The sealing ring is made of elastic material to achieve elastic sealing. The two end faces and the outer ring of the sealing ring are both in contact with the sealing ring groove.

[0024] The inner ring of the sealing ring 4 is provided with an annular inner groove 7, which is provided at the inner ring opening of the sealing ring 4. The cross section of the annular inner groove 7 is arc-shaped and the central angle thereof is greater than 180 degrees.

[0025] The annular inner groove 7 separates two first sealing tongues 8 on both sides of the sealing ring 4. The first sealing tongue 8 is an annular structure. The inner ring of the first sealing tongue 8 fits with the outer ring of the piston rod 2 to achieve sealing. In this embodiment, the middle position of the inner ring of the sealing ring 4 bulges inward, so the first sealing tongue 8 extends toward the inner ring of the sealing ring 4.

[0026] The inner ring of the sealing ring 4 is provided with an annular second sealing tongue 9 to play a role of sealing and dustproofing.

[0027] The sealing ring 4 is provided with a radially penetrating oil inlet hole 5 , an oil filling cup 3 is arranged on the outer side of the cylinder shaft sealing section 1 , and the oil inlet hole 5 is connected with the oil filling cup 3 and the annular inner groove 7 .

[0028] In order to achieve the connection between the oil filling cup 3 and the annular inner groove 7, the outer ring of the sealing ring 4 is provided with an annular oil inlet groove 6, and the oil inlet hole 5 and the oil filling cup 3 are both connected to the oil inlet groove 6. The oil inlet holes 5 are provided in plurality and are evenly distributed along the circumference of the sealing ring 4. In this embodiment, 8 oil inlet holes 5 are provided.

[0029] The cylinder shaft seal section 1 is provided with a radially penetrating threaded hole, and a plane is provided on the outer side of the cylinder shaft seal section 1, on which the threaded hole is processed. One end of the threaded hole is connected to the oil filling cup 3, and the other end is connected to the oil inlet groove 6.

[0030] The use of the utility model:

[0031] Lubricating oil can be injected into the oil inlet groove 6 of the outer ring of the sealing ring 4 through the oil filling cup 3, and then enter the annular inner groove 7 of the inner ring of the sealing ring 4 through multiple oil inlet holes, so as to replenish the lubricating oil into the annular inner groove 7. The annular inner groove 7 separates the two sides of the sealing ring 4 into two first sealing tongues 8. The two first sealing tongues 8 are in contact with the piston rod 2 to achieve sealing, and the second sealing tongue 9 is also provided to achieve dust prevention and improve the sealing effect.

[0032] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A piston rod oil-free lubrication pneumatic seal oil replenishing device, comprising a cylinder shaft seal section (1) and a piston rod (2), characterized in that: The inner hole surface of the cylinder shaft seal section (1) is provided with a groove for installing a sealing ring, a sealing ring (4) is installed in the groove, an inner ring of the sealing ring (4) is provided with an annular inner groove (7), the annular inner groove (7) separates two first sealing tongues (8) on both sides of the sealing ring (4), the sealing ring (4) is provided with a radially penetrating oil inlet hole (5), an oil filling cup (3) is installed on the outer side of the cylinder shaft seal section (1), and the oil inlet hole (5) is connected to the oil filling cup (3) and the annular inner groove (7).

2. The piston rod oil-free lubrication pneumatic seal oil replenishing device according to claim 1, characterized in that: The cross section of the annular inner groove (7) is arc-shaped and the central angle is greater than 180 degrees.

3. The piston rod oil-free lubrication pneumatic seal oil replenishing device according to claim 1, characterized in that: The first sealing tongue (8) extends towards the inner ring of the sealing ring (4).

4. The piston rod oil-free lubrication pneumatic seal oil replenishing device according to claim 1, characterized in that: The inner ring of the sealing ring (4) is provided with an annular second sealing tongue (9).

5. The piston rod oil-free lubrication pneumatic seal oil replenishing device according to claim 1, characterized in that: The outer ring of the sealing ring (4) is provided with an annular oil inlet groove (6), and the oil inlet hole (5) and the oil filling cup (3) are both connected to the oil inlet groove (6).

6. The piston rod oil-free lubrication pneumatic seal oil replenishing device according to claim 5, characterized in that: The cylinder shaft seal section (1) is provided with a threaded hole which penetrates radially, one end of the threaded hole is connected to the oil filling cup (3), and the other end is communicated with the oil inlet groove (6).

7. The piston rod oil-free lubrication pneumatic seal oil replenishing device according to claim 5, characterized in that: A plurality of oil inlet holes (5) are provided and are evenly distributed along the circumference of the sealing ring (4).

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