Valve plate sealing device of differential pressure bypass valve

Abstract

The utility model provides a valve plate sealing device of a differential pressure bypass valve. The valve plate sealing device comprises a metal framework, a rubber sealing part and a bonding layer, the section of the metal framework is of a T-shaped structure, and the metal framework comprises a horizontal part and a vertical part. The horizontal part is of a disc-shaped structure, and an annular groove is formed in the circumferential outer edge of the horizontal part. The vertical part is of a cylindrical structure; the whole rubber sealing part is of a circular ring structure, an arc flange protruding upwards is arranged on the upper portion of the rubber sealing part, a plane attached to the metal groove is arranged on the lower portion of the rubber sealing part, the flange and the plane are in transition connection through a curved surface, and the arc flange of the rubber sealing part is higher than the metal groove; the bonding layer is uniformly coated on the inner wall of the arc-shaped groove, and the rubber sealing part is fixedly connected with the metal framework through the bonding layer; according to the valve plate sealing device of the differential pressure bypass valve, the problem of stress concentration when the sealing part is in contact with the metal framework when the sealing part is pressed and deformed is obviously reduced, the service life of a sealing assembly is prolonged, and the sealing performance and the structural reliability are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid control devices, and in particular relates to a valve plate sealing device for a pressure differential bypass valve. Background Art

[0002] The differential pressure bypass valve is a key control component widely used in aviation hydraulic systems. Its primary function is to open the bypass valve when the pressure differential within the hydraulic system exceeds a safe threshold, directing excess hydraulic oil to the low-pressure side, thereby maintaining system pressure balance and stability. Existing differential pressure bypass valve seals typically utilize a combination of nitrile rubber and metal gaskets. This design is widely used in the industry due to its low cost and mature manufacturing process. However, in actual operation, the performance of this sealing structure has gradually revealed significant limitations.

[0003] The metal grooves of existing sealing assemblies typically feature a regular rectangular cross-section. This structural design limits the contact area between the rubber and metal, resulting in weak adhesion. In high-pressure environments, the bonded area is prone to delamination or peeling, further weakening the reliability of the seal. Furthermore, the root of the rubber seal face abuts the sharp edge of the metal groove. Because the design fails to fully account for deformation and contact stress distribution, the rubber is prone to cracking or opening at the root during use, increasing operational risks. These issues expose shortcomings in the structural optimization of current sealing assemblies.

[0004] Overall, existing differential pressure bypass valve seal assemblies suffer from structural design shortcomings such as small material-metal bonding area, uneven stress distribution, and susceptibility to damage between the seal end face and the metal groove edge. These shortcomings result in poor adaptability over a wide temperature range, sealing stability, and long-term reliability. Therefore, an optimized seal assembly structure is urgently needed to overcome the existing design flaws, improve the overall performance of the seal assembly, and meet the practical application needs of aviation and other demanding fields. Summary of the Invention

[0005] The utility model provides a valve plate sealing device for a pressure differential bypass valve, which solves the problems of insufficient sealing stability and reliability in the prior art.

[0006] In order to achieve the above object, the technical solution of the utility model is as follows:

[0007] A valve plate sealing device for a pressure differential bypass valve comprises: a metal frame, a rubber sealing portion and an adhesive layer;

[0008] The cross section of the metal frame is T-shaped, comprising a horizontal portion and a vertical portion; the horizontal portion is a disc-shaped structure with an annular groove provided along its circumferential outer edge; the vertical portion is a cylindrical structure with a mounting base at its bottom end;

[0009] The rubber sealing portion is an annular structure as a whole, and its cross section is asymmetrical. The upper portion of the rubber sealing portion is an upwardly protruding arc flange, and the lower portion of the rubber sealing portion is a plane that fits the metal groove. The flange and the plane are connected by a curved surface transition, and the arc flange of the rubber sealing portion is higher than the metal groove.

[0010] The adhesive layer is evenly coated on the inner wall of the arc-shaped groove, and the rubber sealing part is fixedly connected to the metal frame through the adhesive layer.

[0011] Furthermore, the annular groove includes an arc-shaped groove at the bottom and side walls extending in arc shapes on both sides of the arc-shaped groove, and the upper portion of the side walls is inclined inwardly toward the center of the arc-shaped groove.

[0012] Furthermore, a safety margin is provided outwardly from the circular arc flange of the rubber sealing portion, and the safety margin is a smooth transition area extending along the outer side of the circular arc flange.

[0013] Furthermore, a deformation groove is provided on the inner side of the circular arc flange of the rubber sealing portion. The deformation groove is an annular groove structure, and its cross section is arc-shaped.

[0014] Furthermore, the horizontal portion and the vertical portion of the metal frame are connected by a stepped transition section.

[0015] Furthermore, the horizontal portion, the vertical portion, the metal groove and the stepped transition section surface of the metal skeleton are all provided with an anodic oxide layer, and the thickness of the anodic oxide layer is 0.01 to 0.03 mm.

[0016] Furthermore, the depth of the arc-shaped groove is 1 / 3 to 1 / 2 of the thickness of the horizontal part of the metal skeleton.

[0017] Furthermore, the safety margin is a smooth transition area extending horizontally along the outer side of the arc flange, and the width of the safety margin is 5% to 10% of the overall width of the rubber sealing part.

[0018] Furthermore, the rubber sealing portion and the metal groove are connected by interference fit.

[0019] Furthermore, the rubber sealing portion is made of fluorosilicone rubber.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The utility model provides a valve plate sealing device for a pressure differential bypass valve, which significantly improves the sealing performance and structural reliability of the sealing component; its rubber sealing part is an annular structure as a whole, with an asymmetrical cross-section, an arc flange higher than the annular groove, and extends outward to form a safety margin; the smooth transition design of the safety margin effectively reduces the stress concentration problem when the sealing part contacts the metal frame when it is compressed and deformed, further improving the sealing performance and the service life of the component; the utility model has excellent sealing stability and applicability in a wide temperature range and high-pressure environment.

[0022] Of course, it is not necessary to achieve all the advantages mentioned above at the same time when implementing the various technical solutions of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0024] Figure 1 This is a schematic cross-sectional view of a valve plate sealing device for a pressure differential bypass valve according to an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 Enlarged view of point B;

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of the metal skeleton of the embodiment of the present utility model;

[0027] In the figure,

[0028] 1-metal skeleton, 101-horizontal part, 102-vertical part, 103-annular groove, 104-step transition section;

[0029] 2- rubber sealing part, 201- arc flange, 202- safety margin, 203- deformation groove. DETAILED DESCRIPTION

[0030] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0031] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this patent.

[0032] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood in a broad sense. For example, they can refer to fixed connection or set, detachable connection or set, or integral connection or set. Those skilled in the art will understand the specific meanings of the above terms in this patent based on the specific circumstances.

[0033] Example:

[0034] See also Figure 1 and Figure 2 The valve disc sealing device for a pressure differential bypass valve of the present invention comprises a metal frame 1, a rubber sealing portion 2, and an adhesive layer. The metal frame 1 has a T-shaped cross-section, comprising a horizontal portion 101 and a vertical portion 102. The horizontal portion 101 is a disc-shaped structure with an annular groove 103 along its circumferential outer edge, which is used to accommodate the rubber sealing portion 2 and provide a stable sealing interface. The vertical portion 102 is a cylindrical structure with a mounting base at its bottom end for fixing to the sealed component to ensure the stability of the device during operation.

[0035] The horizontal portion 101 and the vertical portion 102 of the metal skeleton 1 are connected by a stepped transition section 104. This not only ensures structural strength but also effectively disperses the axial force acting on the vertical portion 102, ensuring more uniform force transmission and preventing fatigue damage caused by stress concentration. Furthermore, the presence of the stepped transition section 104 further stabilizes the connection between the horizontal portion 101 and the vertical portion 102, providing a stable support base for the annular groove 103 and the rubber seal 2, thereby further improving the reliability and durability of the sealing assembly.

[0036] The rubber sealing part 2 is an annular structure as a whole, and its cross-section is asymmetric; an upwardly protruding arc flange 201 is provided on the top of the rubber sealing part 2, and a flat surface that fits the bottom of the annular groove 103 is provided on the bottom; the arc flange 201 is connected to the flat surface through a transition between the curved surface and the flat surface, and the height of the arc flange 201 is higher than the annular groove 103; to optimize the sealing effect, a safety margin 202 is provided on the outside of the arc flange 201. The safety margin 202 is a smooth transition area extending horizontally along the outside of the arc flange, and its width is 5% to 10% of the overall width of the rubber sealing part 2.

[0037] The design of the safety margin 202 significantly improves the performance of the sealing assembly under high-pressure conditions: First, the safety margin 202 effectively avoids the stress concentration phenomenon that may be caused by direct contact between the rubber sealing part 2 and the sharp groove edge of the annular groove 103 when under pressure through the extended smooth transition area, thereby reducing the risk of cracks in the arc flange 201 due to excessive local force; secondly, the structure provides lateral support for the arc flange 201 under dynamic conditions, enhancing its anti-deformation ability and stability; in addition, the safety margin 202 forms a buffer area between the sealing part and the metal frame 1, which effectively reduces the fatigue damage of the sealing part during repeated cyclic loading of the hydraulic system.

[0038] At the same time, a deformation groove 203 is provided on the inner side of the arc flange 201 of the rubber sealing part 2 of this embodiment; the deformation groove 203 is an annular groove structure, and its cross-section is arc-shaped, which can provide a stress release area under high pressure conditions, effectively relieve the concentrated stress of the arc flange 201 caused by pressure changes, and improve the flexible deformation ability of the arc flange 201, thereby further enhancing the sealing performance of the rubber sealing part 2 and ensuring the long-term reliability of the component under complex working conditions.

[0039] Corresponding to the rubber seal 2, the annular groove 103 of this embodiment consists of an arcuate bottom groove and arcuately extending sidewalls. The bottom arcuate groove of the annular groove has a smooth concave surface that aligns with the lower plane of the rubber seal 2, ensuring sealing stability. The upper portion of the sidewall is tilted inward toward the center of the arcuate groove, forming a limiter to secure the rubber seal 2 and restrict its lateral movement. Furthermore, the rubber seal 2 and annular groove 103 are connected by an interference fit of 0.05 to 0.2 mm. This interference fit provides additional compressive force during assembly, ensuring a tight fit between the rubber seal 2 and annular groove 103, further enhancing the sealing effectiveness and reliability of the sealing assembly.

[0040] The depth of the annular groove 103 is designed to be 1 / 3 to 1 / 2 of the thickness of the horizontal part 101 of the metal skeleton. This depth can ensure that the rubber sealing part 2 is reliably embedded in the annular groove 103, while retaining sufficient metal support thickness to withstand the high pressure load in the hydraulic system, thereby achieving a balance between sealing stability and structural strength.

[0041] In order to further enhance the fixing effect and reliability of the sealing assembly, an adhesive layer is evenly coated on the inner wall of the annular groove 103, with a thickness of 0.01 to 0.05 mm; the adhesive layer 3 not only provides additional bonding force, but also works together with the interference fit to ensure that the connection between the rubber sealing part 2 and the metal frame 1 is more secure, effectively preventing loosening or displacement caused by dynamic loads under high-pressure working conditions.

[0042] In this embodiment, in order to enhance the corrosion resistance and wear resistance of the metal skeleton 1, an anodized layer is provided on the surface of the metal skeleton 1; the anodized layer is evenly covered on the horizontal part 101, the vertical part 102, the stepped transition section and the inner wall of the annular groove 103, with a thickness of 0.01 to 0.03 mm; the presence of the anodized layer effectively improves the chemical corrosion resistance of the metal skeleton 1 under harsh working conditions, while reducing the friction loss of the inner wall of the annular groove 103, further extending the service life of the sealing component.

[0043] In terms of materials, the metal skeleton 1 is made of corrosion-resistant alloy steel, and the rubber sealing part 2 is made of fluorosilicone rubber, which has a temperature resistance range of -60°C to 250°C and can maintain excellent elasticity and sealing performance in extreme temperature environments.

[0044] The following is a method for forming a valve plate sealing device of a pressure differential bypass valve, including the following steps:

[0045] Step 1: Preparation of metal skeleton

[0046] Step 101: Select an alloy steel material with high strength and corrosion resistance as the base material of the metal skeleton to ensure its stability and durability under high pressure and wide temperature range.

[0047] Step 102: Use CNC machining technology to process the metal frame into a T-shaped cross-section structure, including a horizontal portion and a vertical portion. The horizontal portion is processed into a disc shape, with an annular groove cut into its outer edge. The bottom of the annular groove is an arc-shaped groove, and the side walls are inclined inward to ensure a close fit with the rubber seal and provide a stop.

[0048] Step 103: After processing, the metal skeleton is anodized, with the oxide layer thickness controlled to be between 0.01 and 0.03 mm. The anodized layer evenly covers the horizontal portion, vertical portion, stepped transition section, and inner wall of the annular groove, enhancing its corrosion resistance and wear resistance while reducing friction on the inner wall of the annular groove.

[0049] Step 2: Molding of rubber seal

[0050] Step 201: Fluorosilicone rubber material is selected because it has a temperature resistance range of -60°C to 250°C, excellent high and low temperature resistance and aging resistance, and can adapt to complex working conditions.

[0051] Step 202: Make a special mold, and preset the shape details of the arc flange, safety margin and deformation groove in the mold cavity.

[0052] Step 203: Place the cut fluorosilicone rubber material into the mold cavity, preheat the mold to 160° C., apply a pressure of 2 to 5 MPa, and vulcanize for 30 minutes to complete the molding of the rubber sealing part.

[0053] Step 204 : Take out the molded rubber seal from the mold and perform dimensional inspection and appearance inspection to ensure that it matches the annular groove of the metal frame.

[0054] Step 3: Bonding process

[0055] Step 301: evenly apply a special adhesive on the inner wall of the annular groove of the metal skeleton, with the coating thickness controlled to be 0.01 to 0.05 mm.

[0056] Step 302: Dry the applied adhesive to ensure that the adhesive layer is uniform and has good adhesion.

[0057] Step 303: embed the formed rubber sealing part into the annular groove so that the bottom plane of the rubber sealing part fits tightly with the arc groove, while ensuring that the arc flange and the safety margin are accurately in place.

[0058] Step 304 , complete the bonding through a hot pressing process, control the hot pressing temperature at 160° C. to 200° C., apply a pressure of 2 to 5 MPa, and maintain the pressure for 30 minutes to ensure that the adhesive layer is firmly bonded to the metal frame and the rubber sealing part.

[0059] Step 4: Quality Inspection

[0060] Step 401: Perform a sealing performance test on the completed sealing assembly to simulate the high-pressure working conditions of the hydraulic system and verify the fit and anti-leakage capability of the rubber sealing part and the metal frame.

[0061] Step 402: Conduct a durability test, repeatedly load the components under a wide temperature range and dynamic load conditions, and evaluate the fatigue resistance and long-term reliability of the components.

[0062] Step 403: Check the coverage of the anodized layer on the surface of the metal skeleton to ensure that there are no corrosion spots or wear defects, thereby ensuring the service life of the device under harsh working conditions.

[0063] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art of the present invention can make some simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. A valve plate sealing device for a pressure differential bypass valve, characterized in that: include: Metal frame, rubber sealing part and adhesive layer; The cross section of the metal frame is T-shaped, comprising a horizontal portion and a vertical portion; the horizontal portion is a disc-shaped structure with an annular groove provided along its circumferential outer edge; the vertical portion is a cylindrical structure with a mounting base at its bottom end; The rubber sealing portion is an annular structure as a whole, and its cross section is asymmetrical. The upper portion of the rubber sealing portion is an upwardly protruding arc flange, and the lower portion of the rubber sealing portion is a plane that fits the metal groove. The flange and the plane are connected by a curved surface transition, and the arc flange of the rubber sealing portion is higher than the metal groove. The adhesive layer is evenly coated on the inner wall of the arc-shaped groove, and the rubber sealing part is fixedly connected to the metal frame through the adhesive layer.

2. The valve plate sealing device of the pressure differential bypass valve according to claim 1, characterized in that: The annular groove comprises an arc-shaped groove at the bottom and side walls extending in arc shapes on both sides of the arc-shaped groove, and the upper portion of the side walls is inclined inwardly toward the center of the arc-shaped groove.

3. The valve plate sealing device of the pressure differential bypass valve according to claim 1, characterized in that: A safety margin is provided outwardly from the circular arc flange of the rubber sealing portion, and the safety margin is a smooth transition area extending along the outer side of the circular arc flange.

4. The valve plate sealing device of the pressure differential bypass valve according to claim 1, characterized in that: A deformation groove is provided on the inner side of the circular arc flange of the rubber sealing part. The deformation groove is an annular groove structure, and its cross section is arc-shaped.

5. The valve plate sealing device of the pressure differential bypass valve according to claim 1, characterized in that: The horizontal portion and the vertical portion of the metal frame are connected via a stepped transition section.

6. The valve plate sealing device of the pressure differential bypass valve according to claim 1, characterized in that: The horizontal portion, the vertical portion, the metal groove and the stepped transition section surface of the metal skeleton are all provided with an anodic oxide layer, and the thickness of the anodic oxide layer is 0.01 to 0.03 mm.

7. The valve plate sealing device of the pressure differential bypass valve according to claim 1, characterized in that: The depth of the arc-shaped groove is 1 / 3 to 1 / 2 of the thickness of the horizontal part of the metal frame.

8. The valve plate sealing device for a pressure differential bypass valve according to claim 3, characterized in that: The safety margin is a smooth transition area extending horizontally along the outer side of the arc flange, and the width of the safety margin is 5% to 10% of the overall width of the rubber sealing part.

9. The valve plate sealing device of the pressure differential bypass valve according to claim 1, characterized in that: The rubber sealing portion is connected to the metal groove through interference fit, and the interference amount is 0.05 to 0.2 mm.

10. The valve plate sealing device of the pressure differential bypass valve according to claim 1, characterized in that: The rubber sealing part is made of fluorosilicone rubber.

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