Combined sealing element and forming method

Abstract

The invention relates to the technical field of elastomer sealing, in particular to a combined type sealing element and a forming method, the combined type sealing element comprises a sealing ring, an annular spiral spring is embedded in the sealing ring, the sealing ring completely wraps the annular spiral spring, and the annular spiral spring and the sealing ring are always kept on the same central axis in the horizontal direction and the vertical direction. According to the combined sealing element, the annular spiral spring is combined with the sealing ring, so that the sealing effect of a rubber soft material is exerted, the performance of an internal material of the sealing ring is enhanced, the surface contact stress of the sealing ring is remarkably improved, and the sealing ring has the advantage of excellent overall comprehensive performance; the method can be applied to scenes with large sealing contact stress requirements and high temperature requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of elastomer sealing, and in particular to a combined sealing component and a molding method. Background Art

[0002] Combined seals play an important role in specific sealing situations with large medium pressure and wide temperature range by increasing the contact stress of the sealing ring, preventing medium leakage and seal failure, and are widely used in many fields.

[0003] Currently, conventional sealing rings primarily increase contact stress by increasing cross-sectional compression. They are typically simply inserted into the sealing groove. In high-pressure sealing environments, even if this increased cross-sectional compression temporarily increases contact stress, the continuous impact of the medium pressure can make it difficult for the sealing ring to remain firmly in the groove. While increased cross-sectional compression enhances sealing effectiveness during initial installation, the sealing ring is susceptible to displacement and deformation when high pressure fluctuates. Once displaced from its original sealing position, the seal fails. Furthermore, the materials and structures of conventional sealing rings, due to their overreliance on increased cross-sectional compression, are susceptible to problems such as overcompression, aging, and poor rebound performance under high pressure. Repeated exposure to high pressure and high temperature degrades the mechanical properties of the sealing ring itself, and cracks and wear easily develop on the surface, leading to loss of sealing function. While simply increasing cross-sectional compression to increase contact stress may provide a certain degree of sealing, it still cannot effectively address the complexities of high-pressure environments, severely restricting the stable operation and performance improvement of high-pressure equipment. The development of new sealing products suitable for high-pressure environments is urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a combined seal and a molding method, which can enhance the internal material performance of the seal ring while exerting the sealing effect of the rubber soft material, effectively increase the contact stress of the seal ring, and cope with high temperature and high pressure situations.

[0005] The technical solution of the present invention is: a combined seal, including a sealing ring, in which an annular coil spring is embedded, and the sealing ring completely wraps the annular coil spring, and the annular coil spring always maintains the same central axis with the sealing ring in the horizontal direction and the vertical direction.

[0006] Furthermore, the number of the annular coil spring and the sealing ring is equal, and there is only one; the wire diameter of the annular coil spring is 1 / 20 to 1 / 10 of the diameter of the combined seal, the cross-sectional diameter of the annular coil spring is 1 / 2 to 3 / 4 of the diameter of the combined seal, and the distance between two adjacent metal wire spirals of the annular coil spring is not greater than 1 / 80 of the circumference of the combined seal.

[0007] Furthermore, the annular coil spring includes a wire spring, a diagonal wire spring, a V-shaped spring and an H-shaped spring, and the wire diameter of the same spring remains unchanged.

[0008] Furthermore, the annular coil spring is made of metal or shape memory material.

[0009] Furthermore, the annular coil spring is made of spring steel or stainless steel.

[0010] Furthermore, the cross-sectional shapes of the sealing ring include O-shape, rectangle, X-shape, Y-shape, U-shape and V-shape.

[0011] Furthermore, the material of the sealing ring includes rubber, resin and materials formed by molecular chain cross-linking reaction.

[0012] A method for forming a combined seal comprises the following steps: 1) Stir the mixed liquid thoroughly and draw vacuum for a certain period of time; 2) Pour the mixed liquid onto the bottom surface of half of the sealing ring mold and pour it to a certain height; 3) Heating: Place the half mold with the mixed liquid at temperature T1 and heat it for a certain period of time until the mixed liquid becomes semi-fluid; 4) Assembling, embedding the prepared annular coil spring above the semi-fluid mixed liquid in the half-side mold; 5) Fill the cavity of the sealing ring mold with the mixed liquid and draw vacuum for a certain period of time; 6) Heating: Heat the sealing ring mold at temperature T2 and keep it for a certain time; 7) Cooling: Cool the sealing ring mold to T3 temperature; 8) Open the mold to obtain the combined seal.

[0013] Furthermore, the temperature T1 satisfies 25°C≤T1<T2; and the temperature T3<25°C.

[0014] Furthermore, the heating method includes heat conduction and heat radiation.

[0015] Compared with the prior art, the present invention has the following advantages: 1. To address the issue of insufficient surface contact stress in existing sealing rings, this invention combines an annular coil spring with the sealing ring to improve the surface contact stress. Compared to traditional sealing rings, this invention incorporates metal, overcoming the susceptibility of rubber alone to aging and failure. This significantly increases the surface contact stress, resulting in superior overall performance. This seal is suitable for applications requiring high sealing contact stress and high temperature requirements.

[0016] 2. While the elastomer plays a sealing role, it can greatly increase the contact stress, solving the problem of insufficient contact stress under high medium pressure.

[0017] 3. Abandoning the traditional solution of increasing contact pressure by simply increasing the cross-sectional compression rate, it effectively solves the problems of ordinary sealing ring materials and structures being prone to excessive compression and poor rebound performance under high pressure due to excessive reliance on increasing cross-sectional compression. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the combined seal of the present invention; Figure 2 This is an exploded view of the combined seal of the present invention; Figure 3 Schematic diagram of the molding process of the combined seal of the present invention In the figure: 1- annular coil spring; 2- sealing ring. DETAILED DESCRIPTION

[0019] To make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0020] refer to Figures 1 to 3 A combined seal includes a sealing ring 2, wherein an annular coil spring 1 is embedded in the sealing ring 2 and completely wraps the annular coil spring 2. The annular coil spring 1 always maintains the same central axis with the sealing ring 2 in the horizontal and vertical directions.

[0021] In this embodiment, the number of the annular coil spring 1 and the sealing ring 2 is equal and is 1; the wire diameter of the annular coil spring 1 is 1 / 20 to 1 / 10 of the diameter of the combined seal, the cross-sectional diameter of the annular coil spring 1 is 1 / 2 to 3 / 4 of the diameter of the combined seal, and the distance between two adjacent metal wire spirals of the annular coil spring 1 is not greater than 1 / 100 of the circumference of the combined seal.

[0022] In this embodiment, the annular coil spring 1 includes a wire spring, a diagonal wire spring, a V-shaped spring and an H-shaped spring, and the wire diameter of the same spring remains unchanged. Specifically, the annular coil spring 1 can be a V-shaped spring, and the cross-sectional shape of the annular coil spring 1 is circular.

[0023] In this embodiment, the material of the annular coil spring 1 is a metal material, such as spring steel or stainless steel. Specifically, the material of the annular coil spring 1 can be 304 stainless steel.

[0024] In this embodiment, the cross-sectional shape of the sealing ring 2 includes O-shape, rectangle, X-shape, Y-shape, U-shape and V-shape. Specifically, the cross-sectional shape of the sealing ring 2 can be O-shaped.

[0025] In this embodiment, the material of the sealing ring 2 includes rubber, resin, and a material formed by molecular chain cross-linking reaction. Specifically, the material of the sealing ring 2 is natural rubber.

[0026] In this embodiment, when the combined seal is formed, the temperature of T1 may be 90-110° C., and the temperature of T2 may be 111-130° C.

[0027] Example 1 The molding method of the above-mentioned combined seal is as follows: Figure 3 As shown, the following steps are included: 1) Stir the mixture of silica gel liquid A and liquid B thoroughly, place it in a vacuum drying oven and vacuum for 4 minutes; 2) Pour the mixed liquid onto the bottom of the half-side of the sealing ring mold and pour it to half the height of the sealing ring mold; 3) Heating: Place the half mold with the mixed liquid in a heating box and heat it at 95°C for 11 minutes until the mixed liquid becomes semi-fluid; 4) Assembling, embedding the prepared annular coil spring 1 above the semi-fluid mixed liquid in the half-side mold; 5) Fill the cavity of the sealing ring mold with the mixed liquid, place it in a vacuum drying oven and draw vacuum for a second time for 11 minutes; 6) Heating: Heat the sealing ring mold in a heating box at 115°C for 11 minutes; 7) Cooling: Cool the sealing ring mold to 20°C; 8) Open the mold to obtain the combined seal.

[0028] In this embodiment, the heating method is thermal radiation.

[0029] Example 2 The molding method of the above-mentioned combined seal is as follows: Figure 3 As shown, the following steps are included: 1) Stir the natural rubber mixture thoroughly and place it in a vacuum drying oven to draw vacuum for 5 minutes; 2) Pour the mixed liquid onto the bottom of the half-side of the sealing ring mold and pour it to half the height of the sealing ring mold; 3) Heating: Place the half mold with the mixed liquid in a heating box and heat it at 100°C for 10 minutes until the mixed liquid becomes semi-fluid; 4) Assembling, embedding the prepared annular coil spring 1 above the semi-fluid mixed liquid in the half-side mold; 5) Fill the cavity of the sealing ring mold with the mixed liquid, place it in a vacuum drying oven and draw vacuum for a second time for 10 minutes; 6) Heating: Heat the sealing ring mold in a heating box at 120°C for a certain period of time; 7) Cooling: Cool the sealing ring mold to 20°C; 8) Open the mold, trim and polish to obtain the combined seal.

[0030] In this embodiment, the heating method is heat conduction.

[0031] Example 3 The molding method of the above-mentioned combined seal is as follows: Figure 3 As shown, the following steps are included: 1) Stir the resin mixture thoroughly and place it in a vacuum drying oven to draw vacuum for 6 minutes; 2) Pour the mixed liquid onto the bottom of the half-side of the sealing ring mold and pour it to half the height of the sealing ring mold; 3) Heating: Place the half mold with the mixed liquid in a heating box and heat it at 105°C for 9 minutes until the mixed liquid becomes semi-fluid; 4) Assembling, embedding the prepared annular coil spring 1 above the semi-fluid mixed liquid in the half-side mold; 5) Fill the cavity of the sealing ring mold with the mixed liquid, place it in a vacuum drying oven and draw vacuum for a second time for 11 minutes; 6) Heating: Heat the sealing ring mold in a heating box at 125°C for a certain period of time; 7) Cooling: Cool the sealing ring mold to 20°C; 8) Open the mold to obtain the combined seal.

[0032] In this embodiment, the heating method is heat conduction.

[0033] The above description is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, designing different forms of combined seals and molding methods thereof does not require creative labor. Without departing from the principles and spirit of the present invention, all equal changes, modifications, substitutions and variations made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A combined seal, comprising a sealing ring (2), characterized in that: The sealing ring (2) is embedded with an annular coil spring (1), and the sealing ring (2) completely wraps the annular coil spring (1). The annular coil spring (1) always maintains the same central axis as the sealing ring (2) in the horizontal direction and the vertical direction.

2. A combined seal according to claim 1, characterized in that: The number of the annular coil spring (1) and the sealing ring (2) is equal, and there is only one; the wire diameter of the annular coil spring (1) is 1 / 20 to 1 / 10 of the diameter of the combined seal, the cross-sectional diameter of the annular coil spring (1) is 1 / 2 to 3 / 4 of the diameter of the combined seal, and the distance between two adjacent metal wire spirals of the annular coil spring (1) is not greater than 1 / 80 of the circumference of the combined seal.

3. A combined seal according to claim 1 or 2, characterized in that: The annular coil spring (1) includes a wire spring, an oblique wire spring, a V-shaped spring and an H-shaped spring, and the wire diameter of the same spring remains unchanged.

4. A combined seal according to claim 1, characterized in that: The material of the annular coil spring (1) is a metal material or a shape memory material.

5. A combined seal according to claim 1 or 4, characterized in that: The material of the annular coil spring (1) is spring steel or stainless steel.

6. A combined seal according to claim 1, 2 or 4, characterized in that: The cross-sectional shapes of the sealing ring (2) include O-shape, rectangle, X-shape, Y-shape, U-shape and V-shape.

7. A combined seal according to claim 1, characterized in that: The material of the sealing ring (2) includes rubber, resin, and a material formed by a molecular chain cross-linking reaction.

8. A molding method for the combined seal according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Stir the mixed liquid thoroughly and draw vacuum for a certain period of time; 2) Pour the mixed liquid onto the bottom surface of half of the sealing ring mold and pour it to a certain height; 3) Heating: Place the half mold with the mixed liquid at temperature T1 and heat it for a certain period of time until the mixed liquid becomes semi-fluid; 4) Assembling, embedding the prepared annular coil spring (1) above the semi-fluid mixed liquid in the half-side mold; 5) Fill the cavity of the sealing ring mold with the mixed liquid and draw vacuum for a certain period of time; 6) Heating: Heat the sealing ring mold at temperature T2 and keep it for a certain time; 7) Cooling: Cool the sealing ring mold to T3 temperature; 8) Open the mold to obtain the combined seal.

9. A method for forming a combined seal according to claim 8, characterized in that: The temperature T1 satisfies 25°C≤T1<T2; the temperature T3<25°C.

10. The method for forming a combined seal according to claim 8, wherein: The heating methods include heat conduction and heat radiation.

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