CS209659B1 - Method of making the packing rings from fibrous materials - Google Patents

Description

DESCRIPTION OF THE INVENTION SOCIALISTIC COPYRIGHT CERTIFICATE

(19)

209659 (II) (BI) (51) Int. Cl.3F 16 J 15/22 (40) Published 3 1 03 8 1

OFFICE OFFICE

AND DISCOVERIES (45) Released 15 07 82 (75)

Author of the invention OPTALIUS KAREL, BENSCH IVAH, SADSKÁ and ČÍŽEK JAN, CSc., PRAGUE (54) Method of production of sealing rings from fibrous materials 1

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing sealing rings of fibrous materials, in particular a trapezoidal cross section.

Sealing rings made from different starting materials, such as, for example, are used to seal the movable and stationary joints of machines and machinery. made of asbestos board, It-boards, stuffing materials, stuffing cords, stuffing belts prepared for bass-fiber materials, and besides, for rubber rubbers, plastics and metal materials. They are most widespread from fibrous materials because of their ease of preparation for advantageous sealing properties. Asbestos board and It-boards form the major component of small-size fibrous materials. They are prepared by treating the fibrous materials and other suitable substances by rolling on calendars into shapudes. Stuffing materials are in the form of loose mixtures, where fibrous materials of small size are the main component. Stuffing strands are prepared from long-fiber materials by knitting yarn, twisted yarn, fibers, or a combination thereof into a shag. Prior to braiding, the textile material is impregnated with various materials to improve their sealing properties. The packing strips are prepared by folding or laminating a textile fabric in combination with other suitable materials. Sealing rings are prepared from asbestos board and It-boards by cutting, from packing materials, packing straps and packing belts by pressing. However, the sealing ability of the sealing ring depends not only on the type, composition and nature of the materials used, but also on the way in which they are processed, but also on the shape of their cross-section. For sealing both the movable and non-movable connections of the machine parts, especially where a trapezoidal cross-sectional shape of the sealing ring is preferred.

The disadvantage of the sealing rings prepared from asbestos board and It-boards, the finely divided fine fibers of textile materials, do not form the structure needed to achieve the preferred mechanical properties of the sealing ring and that its cross-sectional shape can only be rectangular or square. Sealing rings of stuffing materials can be prepared with different cross-sections, but fine textile fibers are unordered and do not form the structure required to achieve the proper mechanical properties of the sealing ring. Sealing rings prepared from packing cords and packing strips are characterized by a textile structure advantageous in terms of mechanical properties. Their disadvantage is that we can only prepare a square or rectangular cross section.

These drawbacks are avoided by the production of fiber ring sealing rings, in particular the trapezoidal cross section of the invention, by using yarns, twisted yarns, fibers or combinations thereof, the suitable amount of which is first wound onto a press mandrel which then pushes it into the pressing sleeve, wherein the pressing members have suitable shape dimensions corresponding to the final shape and dimension of the sealing ring. Then ring 209659

Claims (5)

209659 presses from 0.2 to 200.0 MPa for 1 to 1500 s. After removing the formed ring from the press jig, the ring is ready to seal the machine parts. Substrates for its preparation and conditions of further use are suitable for further heat treatment, which consists in inserting the pressed ring into a furnace subjected to a temperature of between 100 ° C and 600 ° C for 0.5 to 24.0 hours After removing the thus prepared sealing ring from the furnace and cooling it to the normal temperature, the sealing of the machine parts is used. It is advantageous to further press the ready-made sealing ring in a press jig with a pressure of 0.2 to 200.0 MPa in the form of 1 to 1500 s. The advantage of this method of producing the sealing rings according to the invention is that, by suitable combination of the substances used in their manufacture and the shape of the sealing ring cross-section, the sealing rings can be used and advantageously advantageous operating conditions for sealing both movable and stationary machine connections and to use only one ring, the minimum force required for its compression during assembly, optimum distribution of force in the ring and its pressing on the gasket of the flat, so that a long-term tightness is achieved and minimal friction losses and wear are caused by moving joints. Thus, high reliability and durability are achieved. A further advantage of the method of preparing the sealing rings according to the invention is that they are prepared using commonly manufactured yarns, twisted yarns, fibers or combinations thereof prepared, for example, of cotton, hemp, asbestos, graphite, carbon, teflon and the like. they can be saturated with suitable impregnating agents which allow their easy formability, increase the impermeability of the sealants and their resistance to operating under operating conditions, improve the mechanical and frictional properties of the prepared ring and reduce its wear. Another advantage of the method of manufacturing the sealing ring according to the invention is that after its heat treatment of the pressed ring there are advantageous changes in its P E E D Μ E T Method for producing sealing rings of fibrous materials, in particular trapezoidal cross-section, characterized in that the fibrous material is first wound on a pressing mandrel, whereupon it is pressed in a compression sleeve with a pressure of 0.2 to 200.0 MPa for 1 to 1500 seconds. 2. A method according to claim 1, wherein the pressed ring is heated at a temperature of 100 DEG to 600 DEG C. for 0.5 to 24 hours. structure. When used as a sealing element in operation, it does not cause undesirable volume changes caused by temperature. It is advantageous to further over-heat the heat-treated ring, especially where high demands on the accuracy and stability of the sealing element are made both during assembly and during operation, such as when used for high-slip speeds. EXAMPLE 1 In the preparation of a sealing ring of a trapezoid cross-section, a weighed amount of a simple asbestos chemical grade yarn impregnated with anti-water and steam resistant materials up to 250 ° C is wound onto the die mandrel. After its insertion into the press tool, a specific pressure of 4 MPa is pressed in the form of 10 s. Example 2 In the preparation of the sealing ring of the trapezoid cross-section, a simple asbestos chemical impregnated yarn impregnated with Teflon dispersin is weighed onto a press mandrel. After the molding agent has been inserted, it is pressed at a pressure of 8 MPa for 40 s. The seal ring thus prepared is then heated to a temperature of 300 ° C for 24 hours and cooled down to a normal temperature after removal from the furnace. EXAMPLE 3 In the preparation of a sealing ring of a trapezoidal cross-section, a quantity of asbestos chemical grade, imbibed, impregnated with hot gas and vapor-resistant substances above 250 [deg.] C., is wound onto a spindle. After insertion into the press tool, a specific pressure of 20 MPapo is pressed for 60 seconds. The sealing ring thus prepared is heated in a furnace to 500 ° C for 6 hours. After being removed from the oven, it is cooled down to a normal temperature by a pressure of 40 MPa. for 120 s 3. Method according to claim 2, characterized in that, after heat treatment, the sealing ring is again pressed at a pressure of 0.2 to 200.0 MPa for 1 to 1500 seconds. 4. A method according to claim 1, wherein the fibrous material is a yarn, a twisted yarn, a fiber or a combination thereof. 5. A method according to claim 1, wherein the fibrous materials are impregnated with impregnating agents. SfvprograFia. n. pH Guide 7, Bridge