CN101975277A - F-shaped slip ring type combined bilateral dynamic sealing device - Google Patents

Abstract

The invention relates to an F-type slip ring combined double-sided dynamic sealing device, which includes an "F"-shaped slip ring and an "O"-shaped rubber ring. The "O"-shaped rubber ring is squeezed on the "F"-shaped sliding In the notch of the ring, it plays the role of providing elastic force; the opening direction of "F" type is towards the low pressure side; the upper sealing lip of "F" type slip ring is in contact with the inner surface of the external rotating part, and the lower sealing lip is in contact with the surface of the rotating shaft , so as to realize the double-sided dynamic sealing of the rotating shaft and the external rotating parts. The F-type slip ring combined double-sided sealing device solves the sealing problem of the rotating machinery that needs double-sided dynamic sealing, that is, the mechanical sealing problem that both the rotating shaft and the external rotating parts have rotating characteristics. At the same time, it is especially suitable for realizing dynamic sealing at the junction of two parts in the axial direction, and can also be used for unilateral dynamic sealing.

Description

An F-type sliding ring combined double-sided dynamic sealing device

technical field

The invention relates to a dynamic sealing device, in particular to an F-type sliding ring combined double-sided dynamic sealing device.

Background technique

In the past, the sealing of the rotating shaft was often used as a stuffing seal, and later, oil seals and mechanical seals were often used. However, oil seals cannot withstand high pressure, and the working conditions are strictly limited, so it is difficult to apply to seals such as sediment, cement mud and strong corrosive media; although mechanical seals can withstand high pressure up to 40MPa, the structure is complicated, the one-time investment is large, and the cost high.

With the improvement of modern equipment requirements for seals. Although all kinds of slip ring combined sealing methods developed at present have the characteristics of high service life, low friction resistance and no adhesion to metal, they are accompanied by the disadvantage of large leakage, usually rubber seals. 3 times, which limits its use. At the same time, all kinds of slip ring seal structures currently used are dynamic seals on one side of the slip ring and static seals on one side of the O-ring, which makes this type of seal cannot be used in mechanical equipment where parts on both sides of the slip ring can rotate superior. In addition, to achieve dynamic sealing in the narrow space of the junction of two parts in the axial direction, the above dynamic sealing technology also has great limitations.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the rotary shaft dynamic sealing technology in the prior art, and provide a dynamic sealing device capable of double-sided lubrication and double-sided sealing, which can be applied to mechanical equipment where parts on both sides of the slip ring can rotate .

The invention provides an F-type slip ring combined double-sided dynamic sealing device, which includes an "F" type slip ring and an "O" type rubber ring. The "O" type rubber ring is extruded on the "F" type In the notch of the slip ring, it plays the role of providing elastic force; the opening direction of the "F" type is towards the low pressure side; the upper sealing lip of the "F" type slip ring is in contact with the inner surface of the external rotating part, and the lower sealing lip is in contact with the surface of the rotating shaft Contact, so as to achieve double-sided dynamic sealing of the rotating shaft and external rotating parts.

The upper and lower sections of the notch of the "F" slip ring have retaining grooves, so the "O" rubber ring will not be squeezed out and can withstand high pressure.

The "F" type slip ring is made of reinforced polytetrafluoroethylene (PTFE), which has good wear resistance and lubricity.

When the "O" type rubber ring is squeezed into the notch of the "F" type slip ring, it has a certain pre-compression, and its compression rate is generally 11% to 18%.

Beneficial effect

The F-type slip ring combined double-sided sealing device solves the sealing problem of the rotating machinery that needs double-sided dynamic sealing, that is, the mechanical sealing problem that both the rotating shaft and the external rotating parts have rotating characteristics. At the same time, due to its structural characteristics, the F-type slip ring combination is especially suitable for realizing dynamic sealing at the junction of two parts in the axial direction. This not only makes use of the small space at the junction, but also can form a The effective airtight path further enhances the sealing here. The F-type slip ring combined sealing technology can also be used for single-side dynamic sealing. In this case, the tail direction of the "F" type slip ring is used as a static seal, and the entire rotating system will obtain better lubricity and reduce resistance torque.

Description of drawings

Fig. 1 is a structural sectional view of an F-type slip ring combined double-sided dynamic sealing device realized according to the present invention;

In the figure, 1 is an F-type slip ring, 2 is an "O"-shaped rubber ring, 3 is an external rotating part, 4 is a rotating shaft, 5 is a gland, 6 is a low-pressure side, and 7 is a high-pressure side.

Detailed ways

The structural principle and working principle of the present invention will be further described in detail below in conjunction with the drawings and embodiments.

Figure 1 is an F-type slip ring combined double-sided dynamic sealing device realized according to the present invention. As shown in the figure, the F-type slip ring seal is composed of a reinforced polytetrafluoroethylene (PTFE) slip ring (1) with an "F" cross-sectional shape and an "O"-shaped rubber ring (2). The "F" type slip ring is designed with upper and lower sealing lips, and the "O" type rubber ring is placed in the notch of the "F" type slip ring to provide elasticity, so that the upper and lower sealing lips of the "F" type slip ring are tightly attached. Fit on the surface to be sealed to achieve a seal. The "O" type rubber ring has a certain pre-compression, and the compression rate is generally 11% to 18%, so a certain radial force-holding force is generated, so that the upper and lower sealing lips of the "F" type slip ring are tightly attached. Fit on the surface to be sealed to achieve a seal. The higher the pressure, the greater the tightness of the seal, and the tighter the fit between the sealing lip and the sealing surface, so the higher the pressure, the better the sealing. The upper and lower sections of the notch of the "F" slip ring have retaining grooves, so the "O" rubber ring will not be squeezed out and can withstand high pressure.

The upper and lower sealing lips of the slip ring are provided with protrusions and have a specific geometric shape. The upper sealing lip is in contact with the inner surface of the external rotating part 3, and the lower sealing lip is in contact with the surface of the rotating shaft 4. The sharp radial force is conducive to the establishment of an ideal lubricating oil film, that is, maintaining the thickness of the "critical oil film"; secondly, it is conducive to the loss of heat transformed by the harmful friction formed by the high-speed rotation of the shaft. At the same time, the upper and lower sealing lips of the slip ring adopt a "thin lip" structure, which is easy to deform. In this way, the elasticity provided by the "O" rubber ring can make the upper and lower sealing lips have an automatic compensation function, achieving continuous good sealing and high service life. life.

Claims (4)

1. a F type sliding ring type combination bilateral dynamic seal apparatus is characterized in that, comprises that sectional shape is slip ring and " O " type rubber ring of " F " type, and " O " type rubber ring is squeezed in the recess of " F " type slip ring, plays the effect that elastic force is provided; " F " type opening direction is towards low voltage side; The last sealing lip of " F " type slip ring contacts with the internal surface of outside revolving part, and the lower seal lip contacts with the surface of running shaft, thereby realizes the bilateral motive sealing to running shaft and outside revolving part.

2. a kind of F type sliding ring type combination bilateral dynamic seal apparatus according to claim 1 is characterized in that hypomere all has retaining groove on the recess of described " F " type slip ring.

3. a kind of F type sliding ring type combination bilateral dynamic seal apparatus according to claim 1 is characterized in that the material of described " F " type slip ring adopts reinforced TFE.

4. a kind of F type sliding ring type combination bilateral dynamic seal apparatus according to claim 1 is characterized in that, the precompressed shrinkage when described " O " type rubber ring is squeezed in the recess of " F " type slip ring gets 11%～18%.

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