CN202926744U - Hydraulic cylinder and combined seal ring thereof - Google Patents

Abstract

The utility model provides a hydraulic cylinder and a combined sealing ring thereof. The hydraulic cylinder includes a piston, a cylinder barrel, a cylinder head, a piston rod, a first pressure oil, and a first combination sealing ring, wherein a first sealing ring installation groove is arranged on the outer circumference of the piston, and the first combination The sealing ring includes a first O-ring and an expansion sleeve type hole sealing ring composed of a first inner slip ring and a first outer slip ring, wherein the first O-ring is sleeved on the first sealing ring In the installation groove, the sealing ring for the expansion sleeve hole is set on the first O-ring, the first outer slip ring is in contact with the inner wall of the cylinder, and the wide end surface of the first outer slip ring Facing the first pressure oil of the hydraulic cylinder. The advantages of the utility model include: the sealing performance increases with the increase of the working pressure; the wear amount of the combined sealing ring can be automatically compensated; the sealing performance of the piston or the piston rod can be guaranteed not to decline for a long time.

Description

Hydraulic cylinder and its combined sealing ring

technical field

The utility model relates to a hydraulic cylinder sealing technology, in particular to a hydraulic cylinder and a combined sealing ring thereof.

Background technique

Hydraulic cylinder is widely used equipment in metallurgy, steel rolling machinery manufacturing and other industries. It is the actuator in the hydraulic system and is generally used to realize the linear reciprocating motion or swing motion of the mechanism. Heavy-duty hydraulic cylinders are commonly used in medium and high-pressure (above 16MPa-31.5MPa) hydraulic systems.

Generally, the pistons of heavy-duty hydraulic cylinders are generally sealed with a combined seal ring for the hole. FIG. 1 shows a schematic diagram of assembly of a piston-combined sealing ring of a hydraulic cylinder 10 in the prior art. As shown in FIG. 1 , in the prior art, a hydraulic cylinder includes components such as a cylinder barrel 11 , a guide sleeve 12 , a piston 13 , and a piston rod (not shown). The existing combined sealing ring for the hole is made up of an O-ring 14 and a sealing ring 15 for the hole (also called a sealing slip ring). Its working principle is that the O-shaped sealing ring 14 provides elastic pressure so that the sealing slip ring sticks to the inner wall of the hydraulic cylinder barrel 11 or the piston rod to realize sliding sealing. The sealing slip ring is made of polytetrafluoroethylene, which has good wear resistance, low starting resistance and long service life. However, the elastic performance of the O-ring that provides elastic pressure will drop sharply under long-term immersion in hydraulic oil and under the action of temperature and pressure, resulting in insufficient pressure on the sealing slip ring, and the compensation effect on the wear of the sealing slip ring is very poor. Difference. This will directly affect the sealing performance of the combined sealing ring.

Utility model content

In view of the above-mentioned deficiencies in the prior art, one of the purposes of the present utility model is to solve at least one of the above-mentioned problems in the prior art.

One aspect of the utility model provides a combined sealing ring for a hydraulic cylinder. The combined sealing ring for the hydraulic cylinder includes an O-ring and an expansion sleeve type sealing slip ring. The expansion sleeve type sealing slip ring is an expansion sleeve type structure composed of an inner slip ring and an outer slip ring. When in use, The expansion sleeve sealing slip ring is set on the outside or inside of the O-ring.

In a preferred embodiment of the combined sealing ring of the present invention, the inner slip ring and the outer slip ring are made of polytetrafluoroethylene.

Another aspect of the utility model provides a hydraulic cylinder. The hydraulic cylinder includes a piston, a cylinder barrel, a cylinder head, a piston rod, a first pressure oil, and a first combination sealing ring, wherein a first sealing ring installation groove is arranged on the outer circumference of the piston, and the first combination The sealing ring includes a first O-ring and an expansion sleeve type hole sealing ring composed of a first inner slip ring and a first outer slip ring, wherein the first O-ring is sleeved on the first sealing ring In the installation groove, the sealing ring for the expansion sleeve hole is set on the first O-ring, the first outer slip ring is in contact with the inner wall of the cylinder, and the wide end surface of the first outer slip ring Facing the first pressure oil of the hydraulic cylinder.

In an exemplary embodiment of the hydraulic cylinder of the present invention, the hydraulic cylinder may further include second pressure oil, a second sealing ring installation groove and another first combined sealing ring on the basis of the above, wherein, The first pressure oil and the second pressure oil are respectively arranged at both ends of the piston, and the installation groove of the second seal ring is arranged on the outer circumference of the piston, the installation groove of the first seal ring is close to the first pressure oil, and the installation groove of the second seal ring is close to the first pressure oil. Two pressure oils, the wide end of the first outer slip ring of the other first combination seal ring faces the second hydraulic oil.

In an exemplary embodiment of the hydraulic cylinder of the present invention, the hydraulic cylinder may further include a second combined sealing ring and a second sealing ring installation groove on the basis of the above, and the second sealing ring installation groove is set On the part of the cylinder head that cooperates with the piston rod, the second combined sealing ring includes a second O-ring and an expansion sleeve shaft sealing ring composed of a second inner slip ring and a second outer slip ring, wherein , the second O-ring seal is set in the installation groove of the second seal ring, the outer surface of the second outer slip ring is in contact with the inner surface of the second O-ring seal, and the second inner slip ring The inner surface of the second inner slip ring is in contact with the outer wall of the piston rod, and the wide end surface of the second inner slip ring faces the inside of the hydraulic cylinder.

Compared with the prior art, the beneficial effects of the utility model include: the sealing performance increases with the increase of the working pressure; the wear amount of the combined sealing ring can be automatically compensated; the sealing performance of the piston or the piston rod can be guaranteed not to decline for a long time.

Description of drawings

Through the following description in conjunction with the accompanying drawings, the above-mentioned and other purposes and characteristics of the present utility model will become more clear, wherein:

Fig. 1 shows the assembly schematic diagram of the prior art hydraulic cylinder-piston combined sealing ring;

Fig. 2 shows an assembly diagram of a hydraulic cylinder and its combined sealing ring according to an exemplary embodiment of the present invention.

The reference signs are explained as follows:

11-Cylinder, 12-Guide sleeve, 13-Piston, 14-O-ring, 15-hole seal, 21-Cylinder, 22-Cylinder head, 23-Piston, 24-O-ring, 25 -Seal slip ring for expansion sleeve hole, 26-piston rod, 27-seal slip ring for expansion sleeve shaft.

Detailed ways

Hereinafter, the hydraulic cylinder and its combined sealing ring of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 2 shows an assembly diagram of a hydraulic cylinder 20 and its combined sealing ring according to an exemplary embodiment of the present invention.

One aspect of the utility model provides a combined sealing ring for a hydraulic cylinder.

As shown in Figure 2, in an exemplary embodiment of the present utility model, the combined seal ring for the hydraulic cylinder includes an O-ring seal 24 and an expansion sleeve type sealing slip ring, and the expansion sleeve type sealing slip ring is made of The expansion sleeve structure composed of inner slip ring and outer slip ring. The expansion sleeve type sealing slip ring can be divided into the expansion sleeve type hole sealing slip ring 25 and the expansion sleeve type shaft sealing slip ring 27 .

For the expansion sleeve type hole sealing slip ring 25, when in use, it is set on the sealing ring installation groove provided on the outer circumference of the piston 23 together with the O-shaped sealing ring 24, and the expansion sleeve type hole sealing slip ring 25 The inner surface of the inner slip ring is in contact with the O-ring 24, the outer surface of the outer slip ring of the expansion sleeve type hole sealing slip ring 25 is in contact with the inner wall of the piston cylinder, and the outer sliding ring of the sleeve type hole sealing slip ring 25 The wide end face of the ring faces the hydraulic oil, enabling a sliding seal against the piston 23 .

For the sealing slip ring 27 for the expansion sleeve type shaft, when in use, it is set together with the O-ring 24 in the sealing ring installation groove provided on the part of the cylinder head 22 that cooperates with the piston rod 26, and the expansion sleeve type shaft The outer surface of the outer slip ring of the sealing slip ring 27 is in contact with the O-ring 24, the inner surface of the inner slip ring of the expansion sleeve type shaft sealing slip ring 27 is in contact with the piston rod 26, and the sleeve type shaft sealing slip ring The wide end of the inner slip ring of 27 is towards the inside of the hydraulic cylinder, so that the sliding seal to the piston rod 26 can be realized.

In this exemplary embodiment, the O-ring only provides the initial pressure during installation. During operation, the sealing slip ring 25 for the expansion sleeve hole is attached to the inner wall of the cylinder 21 of the hydraulic cylinder, and the sealing slip ring 25 for the expansion sleeve shaft is The ring 27 is pasted on the outer circumferential surface of the piston rod 26, and the pressure of the expansion sleeve type hole sealing slip ring 25 and the expansion sleeve type shaft sealing slip ring 27 are all matched by a pair of the outer slip ring and the inner slip ring. Inclined to provide.

The advantages of the combined sealing ring for hydraulic cylinders in this exemplary embodiment include: its sealing performance increases with the increase of working pressure; The wear amount of the inner slip ring of the sealing slip ring 27 can be automatically compensated; it can ensure that the sealing performance of the piston or piston rod does not decline for a long time.

Preferably, in this exemplary embodiment, the inner slip ring and the outer slip ring are made of polytetrafluoroethylene.

Another aspect of the utility model provides a hydraulic cylinder.

As shown in Figure 2, in an exemplary embodiment of the present utility model, the hydraulic cylinder includes a piston, a cylinder barrel, a cylinder head, a piston rod, left pressure oil and right pressure oil, wherein the left pressure oil and the right pressure oil are respectively It is installed at both ends of the piston. There are two seal ring installation grooves on the outer circumference of the piston (denoted as left seal ring installation groove and right seal ring installation groove). The left seal ring installation groove is close to the left pressure oil and the right seal ring The ring installation groove is close to the right pressure oil; and the hydraulic cylinder also includes two first combined sealing rings (referred to as the first combined sealing ring on the left and the first combined sealing ring on the right).

Wherein, the first combined sealing ring includes an O-ring 24 and an expansion sleeve type hole sealing ring 25 composed of an inner slip ring and an outer slip ring. In this exemplary embodiment, for the first combined sealing ring on the left side, its O-ring 24 is set in the left sealing ring installation groove, and its expansion sleeve hole sealing ring 25 is set in the left O-ring 24, the outer slip ring is in contact with the inner wall of the cylinder 11, and the wide end face of the outer slip ring faces the left pressure oil of the hydraulic cylinder, that is, the wide end face of the outer slip ring faces left. In this exemplary embodiment, for the first combined sealing ring on the right side, its O-ring 24 is set in the right sealing ring installation groove, and its expansion sleeve hole sealing ring 25 is set in the right O-ring 24, the outer slip ring is in contact with the inner wall of the cylinder 11, and the wide end face of the outer slip ring faces the right pressure oil of the hydraulic cylinder, that is, the wide end face of the outer slip ring faces right.

In addition, in another exemplary embodiment of the present utility model, the hydraulic cylinder may further include a second combined sealing ring and a sealing ring installation groove provided on the part of the cylinder head that cooperates with the piston rod on the basis of the above, wherein , the second combination seal ring includes an O-ring seal 24 and an expansion sleeve shaft seal ring 27 composed of an inner slip ring and an outer slip ring.

Wherein, the O-ring seal is set in the seal ring installation groove provided on the cylinder head, the outer surface of the outer slip ring is in contact with the inner surface of the O-ring seal 24, and the inner surface of the inner slip ring is in contact with the outer wall of the piston rod. And the wide end face of the inner slip ring faces the inside of the hydraulic cylinder, that is, the wide end face of the inner slip ring faces rightward.

To sum up, the advantages of this utility model include: Since the combined sealing ring includes an expansion sleeve structure composed of an outer slip ring and an inner slip ring, its sealing performance increases with the increase of the working pressure, and it can automatically compensate Amount of wear of combined seal ring. In addition, the utility model can also ensure that the sealing performance of the piston or the piston rod does not decrease for a long time.

Although the present invention has been described above with reference to the drawings and exemplary embodiments, it should be apparent to those skilled in the art that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims (7)

1. combined seal ring that is used for oil hydraulic cylinder, comprise the O RunddichtringO, it is characterized in that, described combined seal ring also comprises expansion sleeve type sealing slip ring, the described expansion sleeve type sealing slip ring expansion sleeve type structure that interior slip ring and outer slip ring form of serving as reasons, during use, expansion sleeve type sealed sliding ring set is contained in the outside or the inboard of O RunddichtringO.

2. the combined seal ring for oil hydraulic cylinder according to claim 1, is characterized in that, described interior slip ring and outer slip ring are the teflon material.

3. oil hydraulic cylinder, comprise piston, cylinder barrel, cylinder cap, piston rod, the first pressure oil, wherein, be provided with the first seal ring mounting groove on the excircle of described piston, it is characterized in that, described oil hydraulic cylinder also comprises the first combined seal ring, the expansion sleeve type hole seal ring that described the first combined seal ring comprises an O RunddichtringO and is comprised of the first interior slip ring and the first outer slip ring, wherein, a described O RunddichtringO is sleeved in described the first seal ring mounting groove, described expansion sleeve type hole uses ring set on a described O RunddichtringO, the described first outer slip ring contacts with the inwall of cylinder barrel, and the wide end surface of described the first outer slip ring is in the face of the first pressure oil of oil hydraulic cylinder.

4. oil hydraulic cylinder according to claim 3, it is characterized in that, described oil hydraulic cylinder also comprises the second pressure oil, the second seal ring mounting groove and another the first combined seal ring, wherein, the first pressure oil and the second pressure oil are separately positioned on piston two ends, the second seal ring mounting groove is arranged on the excircle of piston, the first seal ring mounting groove is near the first pressure oil, the second seal ring mounting groove is near the second pressure oil, and the wide end surface of the first outer slip ring of described another the first combined seal ring is to the second hydraulic oil.

5. according to claim 3 or 4 described oil hydraulic cylinders, it is characterized in that, described oil hydraulic cylinder also comprises the second combined seal ring and the second seal ring mounting groove, described the second seal ring mounting groove is arranged on cylinder cap and position that piston rod coordinates, described the second combined seal ring comprises the 2nd O RunddichtringO and the expansion sleeve type axle seal ring that is comprised of the second interior slip ring and the second outer slip ring, wherein, described the 2nd O RunddichtringO is sleeved in described the second seal ring mounting groove, the outer surface of described the second outer slip ring contacts with the internal surface of the 2nd O RunddichtringO, the internal surface of described the second interior slip ring contacts with the outer wall of piston rod, and the wide end surface of described the second interior slip ring is inner towards oil hydraulic cylinder.

6. oil hydraulic cylinder according to claim 5, is characterized in that, the described second interior slip ring and the second outer slip ring are the teflon material.

7. according to claim 3 or 4 described oil hydraulic cylinders, is characterized in that, the described first interior slip ring and the first outer slip ring are the teflon material.

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