DE102013017816B4 - poetry - Google Patents

Abstract

Seal for sealing shafts against liquid media such as propeller shafts, impeller shafts, rudder shafts of ships, consisting of a clamping element in assigned housing-fixed support rings as an installation space with a subsequent intermediate part as a membrane and an angled element facing the shaft with the formation of a sealing lip (6) for contact with the Shaft (9), a receiving groove with a spring (5) being arranged in the angled element above the sealing lip (6), characterized in that a lubricating pocket (7) acts as a contact area between the sealing lip (6) and the shaft (9) ) is connected upstream on the bottom, the lubrication pocket (7) being wedge-shaped and the transition from edge boundaries from the lubrication pocket bottom being convex, concave or at an angle as a straight line.

Description

The invention relates to a seal for sealing shafts against liquid media, such as propeller shafts, impeller shafts, rudder shafts of ships, consisting of a clamping element in associated housing-fixed support rings as an installation space with a subsequent intermediate part as a membrane and an angled element facing the shaft with the formation of a Sealing lip to rest on the shaft, a receiving groove with a spring being arranged in the angled element above the sealing lip.

Seals of this type are known in different designs as sealing rings for use in ships. Generic trainings are after the DE 41 41 999 C2 , of the DE 10 2011 018 584 A1 , of the DE 10 2012 006 125 A1 and the US 4,344,631 A suggested.

It is known here to carry out lubrication on the bottom or on both sides. Nevertheless, insufficient lubrication and / or high oil shear forces can occur in this area at higher pressure loads of the sealing ring due to a wide contact area of the sealing lip with the shaft, so that the elastomer used is thermally overloaded.

The object of the invention is to improve a generic seal and to improve the functionality of the seal by simple measures and to ensure an optimized setting.

This object is achieved according to the invention in that the sealing lip is connected upstream of a lubrication pocket in front of a contact area as a sealing edge to the shaft, the lubrication pocket being wedge-shaped and the transition from edge boundaries from the lubrication pocket base being convex, concave or at an angle as a straight line.

As a result, the difficulties of insufficient lubrication and / or oil shear forces are appropriately controlled.

wobei c ein Faktor 0,004 ist.Favorable conditions are created in that the distance a from the lubrication pocket to the sealing edge is made as a bottom-side contact surface corresponding to the diameter D of the shaft $$\text{a}=\text{c}\times \text{D}+\left(2.1\text{to 3}\text{,1}\right)$$

where c is a factor of 0.004.

To further optimize the seal, it is provided that the depth of the lubrication pocket increases at an angle beta as an angle of inclination in the direction of its end region to the sealing edge.

In order to enable the setting of the seal and the assembly without material leakage, further developments according to the features of subclaims 4 to 9 are proposed in the configuration and improvements of the seal.

• 1 eine Schnittdarstellung eines Dichtringes;
• 2 einen eingebauten Dichtring im drucklosen Zustand;
• 3 einen eingebauten Dichtring im druckbeaufschlagten Zustand;
• 4 eine bodenseitige Ansicht eines Dichtringes ohne Gehäuseringe;
• 5 einen Schnitt nach Linie A-A der 4 mit Gehäuseringen;
• 6 eine vergrößerte Ansicht Z gemäß der 5;
• 7 - 9 Schnittdarstellungen nach Linie B-B der 6 mit einem konvexen, konkaven und geraden Übergang zum Schmiertaschenboden;
• 10 - 12 vergrößerte Schnittdarstellungen gemäß Detail Y der 5 mit einem kovexen, konkaven und geraden Übergang zum Schmiertaschenboden;
• 13 - 15 Einbauschritte beim bodenseitigen Einbau des Dichtringes mit Einführschrägen am Aufnahmewulst und an den Gehäuseteilen und
• 16 - 18 Einbauschritte wie 13 bis 15 beim stirnseitigen Einbau.

In the drawings, an embodiment of the invention is shown schematically. Show it:

• 1 a sectional view of a sealing ring;
• 2nd a built-in sealing ring in the depressurized state;
• 3rd a built-in sealing ring in the pressurized state;
• 4th a bottom view of a sealing ring without housing rings;
• 5 a section along line AA of 4th with housing rings;
• 6 an enlarged view Z according to the 5 ;
• 7 - 9 Sectional views along line BB of the 6 with a convex, concave and straight transition to the bottom of the lubrication pocket;
• 10th - 12th enlarged sectional views according to detail Y of 5 with a covex, concave and straight transition to the bottom of the lubrication pocket;
• 13 - 15 Installation steps when installing the sealing ring on the bottom with insertion bevels on the mounting bead and on the housing parts and
• 16 - 18th Installation steps like 13 to 15 for front installation.

The sealing ring shown 1 is made of an elastomer.

The sealing ring 1 consists of an upper clamping element as a bead 4th , which is in housing-fixed metallic support rings 2nd , 3rd is clamped liquid-tight in a known manner. On the bead 4th of the sealing ring 1 a membrane closes 12th on.

The membrane 12th is with a shaft to be sealed 9 facing angled sealing lip 6 of the sealing ring 1 connected and forms a sealing edge with its end region 8th who the on the wave 9 with a contact angle on the bottom.

The membrane 12th and the sealing lip 6 are assigned in this case over an included angle between 90 and 110 degrees when not in use.

To form a contact pressure of the sealing lip 6 with its sealing edge 8th on the wave 9 is next to the elastic return element of the angled sealing lip 6 of the sealing ring 1 an assigned provided. The feather 5 is in this case received in a receiving groove as a spring pocket and has a free space 12th that allow flexible adjustment of the angled sealing lip 6 the seal 1 enables.

This arrangement makes it possible to adjust the contact angle of the sealing lip on the bottom 6 to the wave 9 when pressurized to enlarge and thus adjust accordingly flexibly and to reduce a sealing surface, so that there is a favorable willingness to touch.

To limit the angle of attack of the seal 1 when a specified limit pressure of the medium to be sealed is reached, the support ring facing away from the medium to be sealed is 3rd extended and has a part that extends radially into the area of the shaft surface.

To avoid overloading the material, there is a sealing edge on the bottom 8th the sealing lip 6 a lubrication bag 7 educated. This lubrication bag 7 tapers in a wedge shape towards the sealing edge 8th with an angle alpha and has an angle beta to increase the height in the direction of the sealing edge 8th . Here are the transitions from the edge limits of the lubrication pocket 7 to the bottom of the lubrication pocket either convex R2, concave R1 or at angle gamma 1 as a straight line. During the transition to the end area of the lubrication pocket 7 also convex R4, concave R3 or at angle gamma 2 as a straight line across its height t.

wobei c ein Faktor 0,004 ist.It is provided that the lubrication pocket 7 a distance a to the sealing edge 8th having. This distance is determined from the shaft pressure meter D and a factor c. This results as follows: $$\text{a}=\text{c}\times \text{D}+\left(2.1\text{to 3}\text{,1}\right)$$

where c is a factor of 0.004.

To optimize the deformation of the sealing lip 6 To achieve with a defined stiffness is the sealing ring 1 formed from an elastomer with a ShA value in the range from 80 to 85. In addition, the membrane 12th in relation to length L2 for thickness t2 has a range from 3.2 to 5.3, the sealing lip ( 6 ) a ratio of length L1 to strength t1 in the range of 1.3 to 2.5.

Furthermore, it has been shown that an assembly of the sealing ring 1 with its bead 4th to hold between support rings 2nd , 3rd importance must be attached in order to achieve a perfect arrangement when bracing without the material of the receiving bead 4th push out. For this purpose it is provided that in the passage area of the membrane 12th the support rings 2nd , 3rd and the receiving bead to be picked up 4th opposite corresponding straight bevels b1 have at an angle of 45 degrees, the tapering taking place in the exit direction.

The ratio of the width ( B ) to height ( H ) of the receiving bead 4th is dimensioned in the range between 1.5 and 1.7 when not installed.

Claims (9)

Seal for sealing shafts against liquid media such as propeller shafts, impeller shafts, rudder shafts of ships, consisting of a clamping element in assigned housing-fixed support rings as an installation space with a subsequent intermediate part as a membrane and an angled element facing the shaft with the formation of a sealing lip (6) for contact on the shaft (9), a receiving groove with a spring (5) being arranged in the angled element above the sealing lip (6), characterized in that a sealing edge (8) serves as a contact area of the sealing lip (6) to the shaft (9) Lubrication pocket (7) is connected upstream at the bottom, the lubrication pocket (7) being wedge-shaped and the transition from edge boundaries from the lubrication pocket bottom being convex, concave or at an angle as a straight line. Seal after Claim 1 , characterized in that the distance (a) of the lubrication pocket (7) to the sealing edge (8) as a bottom-side contact surface $$\text{a}=\text{c}\times \text{D}+\left(2.1\text{to 3}\text{,1}\right)$$

determined, where c is a factor of 0.004 and D is the diameter of the shaft. Seal after Claim 1 or 2nd , characterized in that the depth of the lubrication pocket (7) increases at an angle beta as an angle of inclination in the direction of its end region to the sealing edge (8). Seal according to one of the Claims 1 to 3rd , characterized in that the sealing ring (1) consists of an elastomer with a ShA value in the range from 80 to 85 and the resilience by dimensioning a ratio of a length (L2) and thickness (t2) of the membrane (12) in one Range of 3.2 to 5.3 and a ratio of a length (L1) and a thickness (t1) of the sealing lip (6) in the range of 1.3 to 2.5 is achieved. Seal according to one of the Claims 1 to 4th , characterized in that an included angle between the membrane (12) and sealing lip (6) is dimensioned between 90 and 110 degrees when not in use. Seal according to one of the Claims 1 to 5 , characterized in that the length ratio L1: L2 of the sealing lip (6) and membrane (12) is between 0.4 and 0.8. Seal according to one of the Claims 1 to 6 characterized in that the clamping element can be received as a receiving bead (4) made of a rubber-elastic material as an elastomer in support rings (2, 3) fixed to the housing, the support rings (2, 3) in the passage area of the adjoining membrane (12) of the seal (1) and the receiving bead (4) opposite corresponding straight bevels (b1) tapers at an angle of 45 degrees in the exit direction. Seal according to one of the Claims 1 to 7 , characterized in that the straight chamfers (b1) are dimensioned as follows: $$\text{b1}=0.0013\times \text{D}+\left(0.9\text{to 1st}\text{, 3rd}\right)$$

where D is the diameter of the shaft (9). Seal according to one of the Claims 1 to 8th , characterized in that the receiving bead (4) has a ratio of width (B) to height (H) in the range between 1.5 and 1.7 when not installed.

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