Pressure difference sealing rubber ring

Abstract

The utility model discloses a pressure difference sealing rubber ring which is used for sealing connection of flange plates. Comprising an integrated body and a wing ring, the body is located on the low-pressure side, and an annular opening of the wing ring is located on the high-pressure side. The wing ring cavity is connected with high-pressure fluid through an annular opening. Elastic sheets are arranged in the wing rings, or convex points which are circumferentially and uniformly distributed are arranged on the upper surface and the lower surface of the annular opening so as to keep the annular opening unblocked. Or the main body and the wing ring form a cavity, and a hole-shaped opening is formed in the main body on the high-pressure side and communicated with the cavity. High-pressure fluid is prevented from entering the sealing face, it is guaranteed that the high-pressure fluid enters the cavity through the opening, positive pressure in the cavity is used for sealing, and the sealing performance is not affected even if the pre-tightening force of a fastener gradually disappears.

Description

Technical Field

[0001] The utility model is applied to the field of pipeline transportation, and relates to the situation where there is a pressure difference between pipeline fluid and atmospheric pressure. Specifically, it is a rubber ring which utilizes the pressure difference to increase the sealing effect of the connecting flange. Background Art

[0002] In pressure fluid delivery pipelines, flange connection is a commonly used connection method, especially for delivery pumps, valves, detection devices, etc. installed on the pipeline, which are basically flange connections. Normally, the flange sealing surface is processed with a sealing groove, and the sealing rubber ring uses the deformation generated under the action of the fastener preload to achieve sealing. When the preload of the fastener gradually disappears over time, the sealing effect of this gasket deteriorates and leakage occurs. The greater the pressure of the pipeline fluid, the greater the pressure difference with the external atmospheric pressure, and the more serious the leakage. For this reason, the present application uses the pressure of the fluid in the pipeline to design a pressure difference sealing rubber ring. The greater the fluid pressure, the better the sealing effect of the rubber ring.

[0003] There are many patent applications for sealing rings that use pressure difference to seal, such as CN1546888A, a pressure-sealed, pressure-free, self-discharging sealing ring, which has a structure similar to a U-shaped sealing ring or a Y-shaped sealing ring. CN202597708U, a self-expanding flexible sealing structure, and CN201351733Y, a tubular inflatable sealing device, have a hollow circular sealing ring that uses the pressure of the external medium to expand and seal. Their sealing principle is consistent with the applicant's CN221824453U, a water pressure test sealing ring. CN118602054A - a self-tightening sealing ring, sealing structure and air spring, the sealing ring has a hollow circular cross-section, the air inlet faces the high-pressure side, and the pressure difference between high and low pressure is used to achieve sealing. CN216382548U, a sealing ring, also has a hollow circular cross-section, an annular opening is provided on the inner wall, and an annular spring is provided inside the sealing ring. However, the above two patents do not consider initial sealing, that is, they do not consider how to ensure that the pressurized medium enters the hollow cavity for sealing, rather than that there is pressurized medium inside and outside the sealing ring and it cannot expand and seal. The applicant's CN221857520U patent is a T-shaped socket sealing ring, which uses hard rubber to support soft rubber and adopts a ring opening with a full cross section to ensure that the pressure medium enters the inner groove, thereby achieving sealing. However, this sealing ring is not suitable for flange connection sealing. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a pressure difference sealing rubber ring which utilizes the pressure difference between the fluid medium and the atmosphere to realize the connection sealing of the flange, and does not affect its sealing performance even after the pre-tightening force of the flange fastener gradually disappears.

[0005] The technical solution adopted by this utility model is as follows: the pressure differential sealing rubber ring comprises a main body and a wing ring. The main body is located on the low-pressure side of the sealing rubber ring. Two symmetrical wing rings are integrally connected to the main body, and the openings of the wing rings are located on the high-pressure side of the sealing rubber ring. The thickness of the wing rings is less than half the thickness of the main body, retaining a wing ring cavity. Shrapnel is provided within the two wing rings, or the upper and lower surfaces of the openings are provided with circumferentially distributed protrusions to maintain the openings unobstructed.

[0006] Furthermore, the cross-sections of the two wing rings on which the elastic sheets are provided form a V-shape, a U-shape, or a semicircle, and the cross-sectional shape of the elastic sheets corresponds to the shape of the wing rings.

[0007] Furthermore, the spring piece is in a ring shape or a discontinuous fan shape.

[0008] Furthermore, the cross-sections of the two wing rings with protrusions are formed into a circle, or into two connected circles; and the upper and lower surfaces of the connecting openings of the two connected circles are provided with protrusions evenly distributed around the circumference.

[0009] In addition, the pressure difference sealing rubber ring can also be made into an integrated main body and wing ring, the main body is located on the inner and outer sides of the wing ring, the wing ring is located on the upper and lower sides of the main body, and the main body and the wing ring form a cavity; the wing ring corresponds to the groove on the sealing surface; a hole-shaped opening is provided on one side of the main body, and the hole-shaped opening is connected to the cavity; one side of the hole-shaped opening is the high-pressure side, and the thickness of the main body on the high-pressure side is not less than the thickness of the main body on the low-pressure side.

[0010] Furthermore, to enhance the sealing effect, the number of the cavities is not less than one, and the cavities are connected through a connecting port.

[0011] Furthermore, the wing ring is one or a combination of arc, triangle, rectangle, and trapezoid.

[0012] The beneficial effects of the present invention are as follows: the present invention utilizes the positive pressure within the wing ring cavity or the cavity to maintain the seal of the flange, and uses spring pieces or protrusions to keep the annular opening unobstructed, or the hole-shaped opening is connected to the cavity, so as to facilitate the entry of high pressure into the wing ring cavity or the cavity. The higher the pressure, the better the sealing performance. The wing ring is in close contact with the sealing surface of the flange, or the main body on the high-pressure side is sealed with the sealing surface, preventing high-pressure fluid from entering the sealing surface. Even when the preload force of the fastener gradually disappears after long-term operation, the sealing performance of the sealing rubber ring is not affected by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of Example 1;

[0014] Figure 2 This is a schematic diagram of the installation of Example 1;

[0015] Figure 3This is a structural diagram of Example 2;

[0016] Figure 4 This is a structural diagram of Example 3;

[0017] Figure 5 This is a structural diagram of Example 4;

[0018] Figure 6 This is a structural diagram of Example 5;

[0019] Figure 7 This is a structural diagram of Example 6;

[0020] Figure 8 This is a schematic diagram of the installation of Example 6;

[0021] Figure 9 is a structural diagram of Example 7;

[0022] Among them: 1-main body, 2-spring, 3-wing ring, 4-annular opening, 5-convex point, 6-connecting port, 7-cavity, 8-hole opening. DETAILED DESCRIPTION

[0023] Flanges are typically circular. This invention uses a circular rubber pad as an example, but the invention is not limited to circular shapes. The terms high pressure and low pressure mentioned below refer to the pressure inside and outside the pipeline. If the pressure inside the pipeline is greater than the pressure outside the pipeline, the pipeline is considered high pressure, while the pressure outside the pipeline is considered low pressure. Conversely, if the pressure inside the pipeline is less than the pressure outside the pipeline, the pipeline is considered low pressure, while the pressure outside the pipeline is considered high pressure. Example

[0024] The pressure difference sealing rubber ring of this embodiment is as shown in the attached Figure 1 As shown, it is a circular ring, including a main body 1, a spring piece 2, and a wing ring 3, and is used for conveying pipelines of high-pressure fluids. The main body 1 is located on the outer circumference side of the sealing rubber ring, and two symmetrical wing rings 3 are connected to the main body 1 as a whole. The thickness e of the wing ring is less than half of the thickness E of the main body. The cross-section of the two wing rings 3 forms a V shape, and the opening of the V shape is an annular opening 4 on the inner circumference side of the sealing rubber ring. A spring piece 2 is arranged in the main body and the wing ring, and the cross-sectional shape of the spring piece 2 is a V shape corresponding to the wing ring. The spring piece 2 can be annular or intermittent fan-shaped.

[0025] The installation diagram of this embodiment is attached Figure 2, the pressure difference sealing rubber ring is installed between the two flange sealing surfaces. When the flange is fastened by fasteners, the V-shaped wing ring is pressed into a flat shape and is in close contact with the sealing surfaces of the upper and lower flanges. Since the thickness of the wing ring is not more than half the thickness of the main body, the annular opening on the inner circumference is compressed and becomes smaller, but it will not be closed. The role of the spring is mainly in two aspects. One is to maintain the elasticity of the wing ring, especially the upper wing ring, to maintain close contact with the sealing surface of the upper flange to prevent high-pressure fluid from entering the sealing surface. The second is to keep the annular opening on the inner circumference in an unobstructed state at all times to ensure the entry of high-pressure fluid. While the high-pressure fluid flows in the pipeline, the fluid simultaneously enters the V-shaped wing ring cavity from the annular opening. Under the action of the high pressure of the fluid, the pressure difference in the wing ring cavity is positive, and the wing ring is in closer contact with the sealing surface of the flange, ensuring the sealing of the sealing rubber ring. Even if the preload of the fastener gradually decreases, the fluid in the wing ring cavity remains at high pressure, and the wing ring still plays a sealing role, and its sealing performance will not be affected by the disappearance of the preload of the fastener.

[0026] The two wing rings can also form a U-shape or a semicircle, and the annular opening is still on the inner circumference side to facilitate the entry of high-pressure fluid in the pipeline. Example

[0027] The structure of the pressure difference sealing rubber ring in this embodiment is shown in the attached figure. Figure 3 As shown, the ring-shaped device comprises a main body 1, wing rings 3, and protrusions 5, and is used for conveying high-pressure fluids in pipelines. The main body 1 is located on the outer circumference of the sealing rubber ring. Two symmetrical wing rings 3 are integrally connected to the main body 1. The thickness e of the wing rings is less than half the thickness E of the main body. The cross-section of the two wing rings 3 forms a circle with an annular opening 4 located on the inner circumference of the annular sealing rubber ring. Protrusions 5 are evenly distributed around the circumference of the annular opening.

[0028] The installation method of this embodiment is the same as that of Example 1. The difference between the two is that the opening of the annular opening in Example 1 relies on the elasticity of the spring, while the opening of the annular opening in this embodiment relies on the support of the protruding points. When the sealing rubber ring of this embodiment is installed between the sealing surfaces of the two flanges, the circular wing ring is flattened and in close contact with the flange sealing surfaces. The wing ring deforms inward, and its inner diameter changes from large to small. This deformation is very likely to cause the annular opening to close. The purpose of providing the protruding points is to keep the annular opening unobstructed, allowing high-pressure fluid to enter the wing ring cavity. Under the action of the positive pressure in the wing ring cavity, even if the preload force of the fastener gradually disappears, the flange still remains sealed. Example

[0029] This embodiment is an improvement on embodiment 2. Figure 4As shown, it is used for conveying pipelines of high-pressure fluids. The cross-sections of the two wing rings 3 form two connected circles. The annular opening 4 is still located on the inner circumference of the annular sealing rubber ring. The upper and lower surfaces of the annular opening 4 and the connecting port 6 are provided with convex points 5 evenly distributed around the circumference.

[0030] The installation and use methods of this embodiment are the same as those of embodiment 2. Example

[0031] The structure of the pressure difference sealing rubber ring in this embodiment is shown in the attached figure. Figure 5 As shown, this embodiment is used for a low-pressure fluid delivery pipeline. The structure of this embodiment is similar to that of Example 1, except that the positions of the annular opening 4 and the main body 1 are opposite to those of Example 1. The main body 1 is located on the inner circumference of the sealing rubber ring, and the annular opening 4 is located on the outer circumference of the sealing rubber ring. The cross-section of the two wing rings 3 forms a V shape. Spring clips 2 are disposed within the main body and wing rings. The cross-section of the spring clips 2 is V-shaped, corresponding to the wing rings. The spring clips 2 can be annular or intermittently fan-shaped.

[0032] The installation and use methods of this embodiment are the same as those of embodiment 1, except that the fluid in the pipeline is at low pressure, so the wing ring cavity is still at positive pressure. Under the action of this positive pressure, the sealing rubber ring maintains good sealing ability. Example

[0033] The structure of the pressure difference sealing rubber ring in this embodiment is shown in the attached figure. Figure 6 As shown, this embodiment is used for low-pressure fluid delivery pipelines. The structure of this embodiment is similar to that of Example 2, except that the positions of the annular opening 4 and the main body 1 are reversed from those of Example 1. The main body 1 is located on the inner circumference of the sealing rubber ring. The cross-section of the two wing rings 3 forms a circle with an annular opening. The annular opening 4 is located on the outer circumference of the sealing rubber ring. The upper and lower surfaces of the annular opening 4 are provided with raised dots 5 evenly distributed around the circumference.

[0034] The installation and use methods of this embodiment are the same as those of embodiment 2, except that the fluid in the pipeline is at low pressure, so the wing ring cavity is still at positive pressure. Under the action of this positive pressure, the sealing rubber ring maintains good sealing ability. Example

[0035] This embodiment is another structural form of embodiment 2, as shown in the attached Figure 7 As shown. The two wing rings 3 in Example 2 are integrated with the main body 1 to form a cavity 7. The two wing rings have an arc-shaped cross-section. The main body 1 is located on both the inner and outer circumferences of the cavity, forming the inner and outer circumferential bodies. The annular opening 4 in Example 2 is replaced with a hole-shaped opening 8 without the protrusion. This embodiment is used in pipelines for conveying high-pressure fluids. The hole-shaped opening 8 is located on the inner circumference of the sealing rubber ring, and the cavity 7 is under positive pressure.

[0036] The installation and use of this embodiment are shown in the attached Figure 8As shown, the flange sealing surface is machined with an arc-shaped groove corresponding to the arc-shaped wing ring. The two arc-shaped wing rings are placed in the arc-shaped groove. The thickness of the main body on the inner circumference side (high-pressure side) is not less than that on the outer circumference side (low-pressure side), and preferably slightly thicker. This ensures that after the flange is installed, the main body on the inner circumference is in close contact with the flange sealing surface, preventing the high-pressure fluid in the pipeline from entering this contact surface. The high-pressure fluid can only enter the cavity through the hole-shaped opening. The cavity deforms under positive pressure, and the arc-shaped wing rings are in close contact with the arc-shaped groove on the sealing surface, ensuring the flange seal. Even if the preload generated by the fastener disappears, the positive pressure in the cavity can maintain the flange's long-term sealing effect. Example

[0037] The structure of this embodiment is as shown in the attached Figure 9 As shown, it is used for conveying pipelines of low-pressure fluids. The structure of this embodiment is similar to that of embodiment 6, and the two wing rings are connected to the inner and outer circumferential side bodies as a whole to form a cavity 7. The differences are: 1) The position of the hole-shaped opening 8 is opposite to that of embodiment 6, and is located on the outer circumferential side (high-pressure side) of the sealing rubber ring. 2) The thickness of the body on the outer circumferential side (high-pressure side) is not less than the thickness of the body on the inner circumferential side (low-pressure side), and should be slightly higher than the thickness of the body on the inner circumferential side to ensure that the body on the outer circumferential side is in close contact with the sealing surface of the flange, and the high-pressure fluid of the atmosphere will not enter the contact surface, but can only enter the cavity. The installation and use methods of this embodiment are the same as those of embodiment 6, with the difference that the fluid in the pipeline is at low pressure, so that the cavity is still at positive pressure. Under the action of this positive pressure, the sealing rubber ring maintains good sealing ability.

[0038] Embodiment 6 and embodiment 7 can also be made into a structure similar to embodiment 3, where two or more cavities are connected through a connecting port.

[0039] The wing rings in Examples 6 and 7 are arc-shaped, but can also be configured in other shapes such as triangles, rectangles, trapezoids, or elliptical arcs. Accordingly, grooves corresponding to these shapes are also machined on the flange sealing surface. When there are multiple cavities, the wing rings can be one or a combination of the above shapes.

[0040] The utility model utilizes the pressure difference to maintain the sealing of the flange, and the positive pressure is always in the wing ring cavity. Whether using spring pieces or bumps, it is to keep the annular opening unobstructed. The wing ring is in close contact with the flange sealing surface, and the high-pressure fluid cannot enter the sealing surface and can only enter the wing ring cavity. The higher the pressure, the better the sealing. Even if the preload of the fastener gradually disappears after a long period of work, it does not affect the sealing performance of the sealing rubber ring. However, for Examples 6 and 7, it is necessary to machine a groove corresponding to the wing ring on the flange sealing surface, and the effect of preventing high-pressure fluid from entering the sealing surface depends on the close contact between the main body and the sealing surface, rather than the close contact between the wing ring and the sealing surface. The high-pressure fluid also enters the cavity through the hole-shaped opening, and the cavity also maintains the seal between the wing ring and the groove under the action of positive pressure.

[0041] The present invention has a simple structure, low production cost, easy marketability, and simple installation and operation. It is a structural innovation based on the basic ideas of CN221824453U and CN221857520U, and makes up for the shortcomings in installation and operation of the applicant's previous applications for a flange sealing rubber ring (application number 2024206800955) and a flange sealing rubber gasket (application number 2024206791443).

Claims

1. A pressure difference sealing rubber ring, characterized by: It includes a main body and a wing ring, the main body is located on the low-pressure side of the sealing rubber ring, and the two symmetrical wing rings are connected to the main body as a whole, and the annular opening of the wing ring is located on the high-pressure side of the sealing rubber ring; the thickness of the wing ring is less than half the thickness of the main body; springs are arranged in the two wing rings, or the upper and lower surfaces of the annular opening are provided with circumferentially evenly distributed protrusions.

2. The pressure difference sealing rubber ring according to claim 1, characterized in that: The cross-sections of the two wing rings on which the elastic sheets are provided form a V-shape, a U-shape, or a semicircle, and the cross-sectional shape of the elastic sheets corresponds to the shape of the wing rings.

3. The pressure difference sealing rubber ring according to claim 2, characterized in that: The spring piece is in a ring shape or a discontinuous fan shape.

4. The pressure difference sealing rubber ring according to claim 1, characterized in that: The cross-sections of the two wing rings with protrusions are formed into a circle, or into two connected circles; the upper and lower surfaces of the connecting openings of the two connected circles are provided with protrusions evenly distributed around the circumference.

5. A pressure difference sealing rubber ring, characterized by: It includes an integrated main body and a wing ring, the main body is located on the inner and outer sides of the wing ring, the wing ring is located on the upper and lower sides of the main body, and the main body and the wing ring form a cavity; the wing ring corresponds to the groove on the sealing surface; a hole-shaped opening is provided on one side of the main body, and the hole-shaped opening is connected to the cavity; one side of the hole-shaped opening is the high-pressure side, and the thickness of the main body on the high-pressure side is not less than the thickness of the main body on the low-pressure side.

6. The pressure difference sealing rubber ring according to claim 5, characterized in that: The number of the cavities is not less than one and they are connected through the communication port.

7. The pressure difference sealing rubber ring according to claim 5 or 6, characterized in that: The wing ring is in the shape of an arc, a triangle, a rectangle, a trapezoid or a combination thereof.

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