Metal pressure regulating sealing ring and processing method thereof

Abstract

The present application relates to a kind of metal pressure regulating sealing ring and its processing method, belong to mechanical design and processing field.Metal pressure regulating sealing ring includes: elastic baffle, convex point;Baffle one end face is uniformly distributed at least one equal height big convex point;The sealing ring is installed in the sealing space formed by the outer circle of mandrel and bearing inner wall, and there is gap between baffle and mandrel, the gap is connected with the outside world to the communication hole of mandrel, and the lower end surface of convex point and sealing space is tightly attached under the action of working medium, and working medium is discharged outward from the gap between adjacent convex points.

Description

Technical Field

[0001] This invention relates to a metal pressure regulating seal ring and its processing method, belonging to the field of mechanical design and processing. Background Technology

[0002] Metal seals achieve their sealing effect through the mechanical deformation of their structure. They often feature labyrinth seal characteristics, resulting in highly stable sealing and widespread application in the mechanical field. Metal seals have small cross-sectional dimensions, low sliding friction, and are resistant to cold, heat, and impurities. They are suitable for working media such as steam, water, oil, weak acids, and gases, and are particularly useful for sealing bearings under harsh conditions such as high-temperature corrosion, resisting harsh environments to reduce high oil consumption and improve bearing operating conditions. Grease seals used in rolling and sliding bearings effectively prevent the intrusion of dust and mist. Combination seals for bores and shafts offer even better sealing performance. During use, the outer ring of the seal adheres tightly to the inner housing due to its own tension. There is no relative movement between the outer diameter of the stacked ring and the housing. However, due to the pressure of the working medium such as water or gas, one end face of the stacked ring adheres tightly to one side of the stacked ring groove, creating relative movement. Generally, liquid or grease is used for lubrication and leak sealing, thus achieving a sealing effect.

[0003] Traditional sealing rings can only be used for sealing and dust prevention in low-pressure or unpressurized cavities, and are generally used in bearings or components that rotate at low speeds. They are unsuitable for applications where the internal cavity has high pressure and ultra-high-speed rotation, requiring the sealing component to maintain a specific air pressure while also preventing liquid and dust. This invention addresses this problem by designing a sealing ring with raised dots and a pressure-adjusting function, and by designing multiple sets of tooling fixtures for the processing of this metal pressure-maintaining sealing ring. Summary of the Invention

[0004] Purpose of the invention: To provide a metal pressure-regulating sealing ring. Currently, both metal and non-metal sealing rings only emphasize the sealing function of the internal cavity medium, failing to regulate the pressure of the working medium within the cavity. During ultra-high-speed rotation of the spindle and bearing, high pressure and high temperature are generated, causing irreversible damage to the product. This invention adds metal protrusions to the end face of the metal sealing ring. During operation, the end face with the protrusions is pressed against one side of the sealing groove by the working medium. The working medium is discharged outwards through the gaps in the protrusions. Utilizing Bernoulli's principle, the flow velocity of the working medium discharged through the gaps in the protrusions is greatly increased, forming a ring-shaped jet at the spindle outlet. The impact of this jet ensures that water, dust, and other impurities do not enter the cavity, achieving a very high protective effect. Furthermore, the high-speed ejected working medium also carries away heat from the cavity, achieving a cooling effect.

[0005] Technical solution:

[0006] In a first aspect, a metal pressure regulating sealing ring is provided, comprising: an elastic retaining ring and a protrusion;

[0007] At least one protrusion of equal height and size is evenly distributed on one end face of the retaining ring;

[0008] The sealing ring is installed in the sealing space formed by the outer circle of the spindle and the inner wall of the bearing. There is a gap between the retaining ring and the spindle, which connects the connecting hole of the spindle to the outside. The protrusions and the lower end face of the sealing space are tightly attached under the action of the working medium, and the working medium is discharged outward from the gap between adjacent protrusions.

[0009] When the spindle rotates, the high-pressure working medium enters the gap between the spindle and the inner wall through the connecting hole, pushing the metal pressure regulating sealing ring to press against one side of the spindle sealing groove. The working medium is discharged to the outside through the gap between the protrusion and one side of the sealing groove. Utilizing Bernoulli's principle, the flow velocity of the discharged working medium will be greatly increased compared with the high-pressure inner cavity. Driven by the rotating spindle, a ring-shaped jet is formed at the outlet. The impact of this jet ensures that impurities do not enter the cavity.

[0010] The metal material with raised dots has mechanical properties such as corrosion resistance, low melting point, good weldability and ductility.

[0011] Retaining rings include single-layer elastic retaining rings with beveled slits or sealing stacks.

[0012] Secondly, a method for processing a metal pressure regulating seal ring is provided, including:

[0013] The inner rings of several pre-machined retaining rings are fitted onto the fixed mandrel of the heat treatment fixture for heat treatment, so as to control the deformation trend in each direction.

[0014] The heat-treated retaining ring is installed on the welding fixture, and molten metal is dripped in through the welding hole and welded to one end face of the retaining ring to complete the rough machining of the metal protrusion.

[0015] Remove the sharp edges, burrs, and excess weld beads from the rough-machined metal protrusions;

[0016] After removing impurities, install the retaining ring in the grinding machine fixture and grind the metal protrusions flat so that the protrusions on the same sealing ring are at the same horizontal height.

[0017] The heat treatment fixture includes: a first shouldered hexagonal nut, a retaining sleeve, a second shouldered hexagonal nut, and a central shaft; the second shouldered hexagonal nut locks the central shaft from bottom to top, the retaining sleeve passes through the central shaft and is pressed between the central shaft step and the second shouldered hexagonal nut, the space between the retaining sleeve and the central shaft is used to insert a retaining ring, and the top of the space is filled with a clamping washer to prevent wobbling; the first shouldered hexagonal nut locks downward from the top of the central shaft and presses against the upper surface of the clamping washer.

[0018] The welding fixture includes: a welding base, a welding nut, an annular mounting groove, and a welding hole;

[0019] The welding base is a double-layer cylindrical structure. The outer circle of the upper end face of the upper cylinder has an annular groove to accommodate the retaining ring. The upper cylindrical structure is screwed with a welding nut to press the retaining ring. The upper end face of the welding nut has a welding hole, and the welding hole is directly opposite several specific positions of the retaining ring to facilitate protrusion welding at these specific positions.

[0020] The grinding machine fixture includes: a base plate, a tool setting block, a fixed base, an elastic expansion sleeve, and a tensioning bolt; the elastic expansion sleeve includes an outer cylindrical boss, an annular groove, and a shoulder;

[0021] The tool setting block and the fixed base are fixedly connected on the base plate. The elastic expansion sleeve is precisely positioned with the fixed base through the shoulder and is installed inside the fixed base. The metal protrusion is installed upward at the annular groove. Under the action of external force, the conical surface of the tension bolt fits against the conical surface of the elastic expansion sleeve until the outer circle protrusion of the expansion sleeve expands, tightening the inner ring of the metal pressure regulating seal ring after rough machining of the metal protrusion. The outer ring of the metal pressure regulating seal ring after rough machining of the metal protrusion and the other side are fixed by the fixed base. The upper end face is gently tapped with a plastic rod to ensure that the bottom surface is in contact. Continue to tighten the tension bolt to ensure that its upper end face is not higher than the upper end face of the fixed fixture.

[0022] Beneficial effects:

[0023] The metal pressure regulating seal ring with protrusions designed by this invention can regulate the high pressure and high temperature generated in the cavity when the mandrel and bearing rotate at ultra-high speed. It has the functions of pressure regulation and maintenance, heat dissipation and waterproofing and dustproofing. It avoids the drawback of conventional metal and non-metal seal rings that only block the internal cavity medium and cannot regulate the pressure of the internal working medium.

[0024] Furthermore, the heat treatment fixture designed for the metal pressure regulating seal ring according to the present invention is used to perform a heat treatment process on the elastic retaining ring of the metal pressure regulating seal ring, so as to increase the strength and elasticity of the metal pressure regulating seal ring and other mechanical properties.

[0025] Furthermore, by using the welding fixture designed for the metal pressure regulating seal ring of the present invention to weld the required metal protrusions, the weld points on its end face can be welded evenly, ensuring that the metal pressure regulating seal ring has good lubrication and sealing performance when it is fitted.

[0026] Furthermore, the present invention controls the thickness of the metal protrusions using a grinding machine fixture designed for the metal pressure regulating seal ring. During operation, one end face of the protrusion is pressed against one side of the sealing groove by the working medium. The thickness of the protrusion controls the size of the gap, thereby controlling the airflow velocity and internal pressure within the gap.

[0027] The metal pressure regulating sealing ring and various processing fixtures of the present invention have great potential for application in the fields of sealing and machining. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a single-layer metal pressure regulating sealing ring with a beveled slit;

[0029] Figure 2 This is a schematic diagram of a double-layered, elastic metal pressure regulating sealing ring;

[0030] Figure 3 This is a structural diagram of a metal pressure regulating seal ring in use;

[0031] Figure 4a This is the front view of the batch heat treatment fixture for the metal pressure regulating seal ring substrate;

[0032] Figure 4b This is a cross-sectional view along line "AA" of the batch heat treatment fixture for the metal pressure regulating seal ring substrate;

[0033] Figure 5 This is a magnified view of point J in Figure 4;

[0034] Figure 6a This is a cross-sectional view of a welding fixture for welding the protrusions of a metal pressure regulating seal ring;

[0035] Figure 6b This is an isometric view of the welding fixture for welding the protrusions of the metal pressure regulating seal ring;

[0036] Figure 7 This is an isometric view of the grinding machine fixture for the metal pressure regulating seal ring;

[0037] Figure 8 yes Figure 7 Enlarged view of point I;

[0038] Figure 9 yes Figure 7 Central sectional view;

[0039] Among them, 1-single-layer elastic retaining ring with oblique slit, 2-oblique slit, 3-protrusion, 11-sealing stacked ring, 12-notch joint, 101-connecting hole, 102-gap between spindle and inner wall, metal pressure regulating sealing ring-100, 103-gap between protrusion and one side of sealing groove, 104-high pressure working medium outlet, 4-second shouldered hexagonal nut, 5-flat washer, 6-compression washer, 7-fixing sleeve, 8-second shouldered hexagonal nut, 9-bulk installation location of elastic retaining ring, 1 0-Central shaft, 15-Welding base, 16-Welding nut, 17-Annular mounting groove, 18-Welding hole, 21-Base plate, 22-Tool setting block, 23-Fixed base, 24-Internal hex bolt, 25-Elastic expansion sleeve, 26-Tightening bolt, 27-Hexagonal thin nut, 51-Tightening bolt conical surface, 52-Elastic expansion sleeve conical surface, 53-Annular groove, 54-Expansion sleeve outer circle boss, 55-Shoulder, 60-Tool setting block upper end face, 61-Fixed fixture upper end face, 62-Reference surface. Detailed Implementation

[0040] like Figure 1 As shown, metal protrusions 3 are welded onto a single-layer elastic retaining ring 1 with a beveled slit, wherein the beveled slit 2 is the opening point during installation; furthermore, after the beveled slit 2 is cut, the single-layer elastic retaining ring 1 with a beveled slit tends to expand outward due to the mechanical properties of the material, which can better fit the inner wall after installation.

[0041] Preferred, such as Figure 2 As shown, metal protrusions 3 are welded onto the sealing ring 11, where the notch joint 12 is the opening during installation. Due to the mechanical properties of the material, it tends to expand outward, allowing for better adhesion to the inner wall after installation. The sealing ring 11 is a technology known in the art.

[0042] above Figure 1 and Figure 2 These are two structural forms of the metal pressure regulating seal ring 100.

[0043] like Figure 3 As shown, when the spindle rotates, the high-pressure working medium enters the gap 102 between the spindle and the inner wall through the connecting hole 101, pushing the metal pressure regulating sealing ring 100 to press against one side of the sealing groove. The working medium is discharged to the outside at the high-pressure working medium outlet 104 after passing through the gap 103 between the protrusion and one side of the sealing groove. Utilizing Bernoulli's principle, the flow velocity of the discharged working medium will be greatly increased compared with the high-pressure inner cavity. Driven by the rotating spindle, a ring-shaped jet is formed at the outlet. The impact of this jet ensures that water, dust and other impurities do not enter the cavity, achieving a very high protection effect. In addition, the high-speed ejected working medium can also carry away the heat in the cavity, playing a role in cooling.

[0044] Furthermore, by changing the size of the protrusion, the size of the gap 103 between the protrusion and one side of the sealing groove can be adjusted, thereby controlling the flow rate of the high-pressure working medium.

[0045] Furthermore, controlling the flow rate of the high-pressure working medium can regulate the working pressure of the medium within the cavity.

[0046] The processing method involves using multiple sets of fixtures, with the processing sequence being: batch heat treatment fixture → welding fixture → grinding fixture.

[0047] like Figures 1-2 and Figures 4a-5 As shown, the central shaft 10 is positioned by a shoulder and mounted on the fixed sleeve 7 using a shouldered hexagonal nut 8. Several single-layer elastic retaining rings 1 or sealing rings 11 with oblique slits are fitted onto the central shaft 10. The shouldered hexagonal nut 4 drives the flat washer 5 and the clamping washer 6 to press the elastic retaining rings at the batch installation location 9. The batch heat treatment fixture controls the deformation trend of the single-layer elastic retaining rings 1 or sealing rings 11 with oblique slits in various directions to control the deformation of the single-layer elastic retaining rings 1 or sealing rings 11 with oblique slits.

[0048] Furthermore, by performing appropriate heat treatment on nickel-based elastic metal materials or stainless steel materials, the strength and elasticity of the single-layer elastic retaining ring 1 with oblique slits or sealing stack ring 11 and other elastic retaining rings can be significantly improved.

[0049] like Figures 1-2 and Figure 6a and Figure 6b As shown, the welding nut 16 is installed on the welding base 15, and the single-layer elastic retaining ring 1 or sealing stack 11 with oblique cut is installed in the annular mounting groove 17. Molten metal is dripped in through the welding hole 18 and welded to one end face of the single-layer elastic retaining ring 1 or sealing stack 11 with oblique cut to complete the rough machining of the metal protrusion, with basic requirements such as no missing welds and no falling off.

[0050] Preferably, the metal material of the protrusion should have mechanical properties such as corrosion resistance, low melting point, good weldability and ductility.

[0051] Furthermore, after the rough machining of the metal bumps, the fitter should remove the sharp edges, burrs, and excess weld beads and other impurities to ensure the smooth progress of the next process.

[0052] like Figure 3 and Figures 7-9As shown, the fixed base 23 is connected to the base plate 21 by an internal hex bolt 24, and a tool setting block 22 is provided next to it. The elastic expansion sleeve 25 is precisely positioned with the fixed base 23 by the shoulder 54. The elastic expansion sleeve 25 is installed inside the fixed base 23 by a hexagonal thin nut 27. The metal pressure regulating sealing ring 100 with the metal protrusions rough machined is installed with the metal protrusions facing upward at the annular groove 53. Tighten the tension bolt 26 to push the conical surface 51 of the tension bolt to fit with the conical surface 52 of the elastic expansion sleeve until the outer circle boss 54 of the expansion sleeve expands to tighten the inner ring of the metal pressure regulating sealing ring 100 with the metal protrusions rough machined. The outer ring of the metal pressure regulating sealing ring 100 with the metal protrusions rough machined and the other side are fixed by the fixed base 23. The upper end face is tapped lightly with a plastic rod to ensure that the bottom surface is in contact. Continue to tighten the tension bolt 26 to ensure that its upper end face is not higher than the upper end face 61 of the fixed fixture.

[0053] Preferably, the distance between the upper end face 60 of the tool setting block and the upper end face 61 of the fixed fixture should be a fixed value. During grinding, the tool is set on the upper end face 60 of the tool setting block. The actual grinding wheel stroke is the actual distance between the upper end face 60 of the tool setting block and the upper end face 61 of the fixed fixture minus the height of the metal boss. This ensures that the height of each metal protrusion is consistent.

Claims

1. A device equipped with a metal pressure regulating sealing ring, characterized in that, include: Spindle, bearing and metal pressure regulating seal; Metal pressure regulating seals include elastic retaining rings and raised dots; At least one protrusion of equal height and size is evenly distributed on one end face of the elastic retaining ring; The sealing ring is installed in the sealing space formed by the outer circle of the spindle and the inner wall of the bearing. There is a gap between the elastic retaining ring and the spindle, which connects the connecting hole of the spindle to the outside. The protrusions and the lower end face of the sealing space are tightly attached under the action of the working medium, and the working medium is discharged outward from the gap between adjacent protrusions. When the spindle rotates, the high-pressure working medium enters the gap between the spindle and the inner wall through the connecting hole, pushing the metal pressure regulating sealing ring to press against one side of the spindle sealing groove. The working medium is discharged to the outside through the gap between the protrusion and one side of the sealing groove. Utilizing Bernoulli's principle, the flow velocity of the discharged working medium will be greatly increased compared with the high-pressure inner cavity. Driven by the rotating spindle, a ring-shaped jet is formed at the outlet. The impact of this jet ensures that impurities do not enter the cavity.

2. The apparatus according to claim 1, characterized in that, The metal material with raised dots has mechanical properties such as corrosion resistance, low melting point, good weldability and ductility.

3. The apparatus according to claim 1, characterized in that, Retaining rings include single-layer elastic retaining rings with beveled slits or sealing stacks.

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