CN204664411U - A kind of draining sealing configuration of oil hydraulic cylinder - Google Patents

Abstract

The utility model discloses a drainage sealing structure of a hydraulic cylinder, which belongs to the technical field of hydraulic cylinder sealing. The guide sleeve of the hydraulic cylinder is processed with a radial discharge port, and the inner peripheral surface of the guide sleeve is processed with two U-shaped seal ring installation grooves, and the two U-shaped seal ring installation grooves are located along the axial direction of the guide sleeve. The two sides of the mouth; the guide sleeve is fixedly connected with the end of the cylinder, the piston rod is slidingly matched with the guide sleeve, and the U-shaped seal ring installation groove of the guide sleeve is equipped with a U-shaped seal ring. The utility model can ensure the reliable sealing of the hydraulic cylinder when the hydraulic cylinder works under large depth of water by setting the drain port and two U-shaped sealing rings on the guide sleeve.

Description

Drain sealing structure of a hydraulic cylinder

technical field

The utility model relates to a drainage sealing structure of a hydraulic cylinder, which belongs to the technical field of hydraulic cylinder sealing.

Background technique

When the hydraulic cylinder is used in an underwater environment, the piston rod performs a relative telescopic movement relative to the cylinder, which requires a good dynamic sealing environment between the piston rod and the guide sleeve. At present, the common sealing structure is to install a seal inside the guide sleeve. A seal is achieved to prevent oil from leaking inside the cylinder and water from the outside to be forced into the cylinder. When the hydraulic cylinder is used in a large depth environment, it is easy to cause water to enter the hydraulic cylinder when the external water pressure changes greatly, and the mixture of oil and water will pollute the entire hydraulic system.

Utility model content

The utility model provides a drainage sealing structure of a hydraulic cylinder. By setting a drainage port and two U-shaped sealing rings on the guide sleeve, the reliable sealing of the hydraulic cylinder can be guaranteed when the hydraulic cylinder works under deep water.

A hydraulic cylinder drainage sealing structure, including a piston rod, a guide sleeve and two U-shaped sealing rings, and the peripheral equipment is a cylinder barrel;

The guide sleeve is processed with a radial discharge port, and the inner peripheral surface of the guide sleeve is processed with two U-shaped sealing ring installation grooves, and the two U-shaped seal ring installation grooves are located at the discharge port along the axial direction of the guide sleeve. both sides of

Its overall connection relationship is as follows: the guide sleeve is fixedly connected with the end of the cylinder, the piston rod is slidingly fitted with the guide sleeve, and the U-shaped seal ring installation groove of the guide sleeve is equipped with a U-shaped seal ring.

Further, a scraping ring is further included, the scraping ring is fixedly installed at the end of the guide sleeve, and the inner peripheral surface of the scraping ring is attached to the outer peripheral surface of the piston rod.

Beneficial effect

1. The sealing structure of the present utility model not only has a compact structural layout but also has a good sealing effect. Since the drain port is set in the middle of the two seals, the drain port can discharge the water infiltrated in the first seal, which greatly reduces the pressure of the second seal. The water pressure at the place, so as to achieve the effect of reliable sealing.

2. The scraper ring of the utility model can scrape off the solid dirt attached to the surface of the piston rod during the retraction process of the piston rod, protect the seal inside the guide sleeve, and prolong the service life of the seal.

Description of drawings

Fig. 1 is a schematic diagram of the overall composition of the utility model;

Figure 2 is a partial enlarged view of the figure.

Among them: 1-piston rod, 2-guide sleeve, 3-cylinder barrel, 4-drainage port, 5-U-shaped sealing ring Ⅰ, 6-U-shaped sealing ring Ⅱ, 7-scraping dirt ring.

Detailed ways

As shown in Figure 1, the drainage sealing structure of the hydraulic cylinder of the present invention includes a piston rod 1, a guide sleeve 2, a U-shaped sealing ring I5, a U-shaped sealing ring II6 and a scraper ring 7, and the peripheral equipment is a cylinder 3;

The guide sleeve 2 is processed with a radial discharge port, and the inner peripheral surface of the guide sleeve 2 is processed with two U-shaped seal ring installation grooves, and the two U-shaped seal ring installation grooves are located along the axial direction of the guide sleeve. both sides of the opening;

Its overall connection relationship is: the guide sleeve 2 is fixedly connected with the end of the cylinder barrel 3, the piston rod 1 is slidingly fitted with the guide sleeve 2, and the U-shaped sealing ring installation grooves of the guide sleeve 2 are respectively A U-shaped sealing ring I5 and a U-shaped sealing ring II6 are installed, the scraping ring 7 is fixedly installed at the end of the guide sleeve 2 , and the inner peripheral surface of the scraping ring 7 is attached to the outer peripheral surface of the piston rod 1 .

Working principle: When the oil cylinder as a whole is working underwater at a large depth, if the water pressure breaks through the first U-shaped sealing ring, the seepage water will be discharged from the discharge port, which is not connected to the outside, and the discharge port is connected through a pipeline In the special water outlet system, the second U-shaped sealing ring continues to play a sealing role at this time.

In summary, the above are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (2)

1. a draining sealing configuration for oil hydraulic cylinder, is characterized in that, comprises piston rod (1), guide sleeve (2) and the U-shaped seal ring of twice, and peripheral unit is cylinder barrel (3);

Described guide sleeve (2) is processed with radial bleed outlet, the inner peripheral surface of guide sleeve (2) is processed with the U-shaped seal ring mounting groove of twice, the U-shaped seal ring mounting groove of twice is positioned at the both sides of bleed outlet along the axis of guide sleeve;

Its integrated connection closes: described guide sleeve (2) is fixedly connected with the end of described cylinder barrel (3), described piston rod (1) and described guide sleeve (2) are slidably matched, and the U-shaped seal ring mounting groove of described guide sleeve (2) is built with U-shaped seal ring.

2. the draining sealing configuration of oil hydraulic cylinder according to claim 1, it is characterized in that: also comprise a dirt-scrapping ring 7, described dirt-scrapping ring (7) is fixedly mounted on the end of guide sleeve (2), and the inner peripheral surface of described dirt-scrapping ring (7) and the periphery of piston rod (1) are fitted.