U-shaped packing with spring for energy storage

Abstract

The utility model relates to the technical field of sealing, and discloses a spring energy storage U-shaped packing which comprises a packing body and a U-shaped spring, the cross section of the packing body is in a U shape, tooth-shaped sawtooth edge elastic pieces are arranged on the two sides of the packing body, the two elastic pieces are symmetrical with the center line of the cross section of the packing body as the symmetry axis, the cross section of the U-shaped spring is in a U shape, and the U-shaped spring is in a U shape. Rectangular through holes located in the same center line are formed in the inner side and the outer side of the packing body, and the U-shaped spring and the packing body are overlapped and connected through steps to form a spring energy storage structure. A 90-degree right-angle-shaped step is arranged in the packing body, and the U-shaped spring is provided with a connecting step matched with the right-angle-shaped step. According to the U-shaped packing capable of storing energy through the spring, the U-shaped spring and the packing body are close to each other and coincide with each other, so that the packing can form certain tension to achieve initial sealing, and the sealing performance of the packing is improved. And meanwhile, the packing has the characteristics of pressure resistance, high temperature resistance, acid and alkali resistance improvement, long service cycle and the like.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a U-shaped packing with spring energy storage. Background Technology

[0002] Packing, also known as sealing packing, is typically made of woven, soft, thread-like materials. These strips, usually square, rectangular, circular, or U-shaped in cross-section, fill the sealing cavity to achieve a seal. Originally, packing seals used fibers such as cotton and linen to plug leak channels and prevent liquid leakage, primarily for shaft seals in water-lifting machinery. Due to the wide availability of packing materials, ease of processing, low cost, reliable sealing, and simple operation, it remains in use today. Currently, packing is widely used for shaft seals in centrifugal pumps, compressors, vacuum pumps, mixers, and ship propellers; reciprocating shaft seals in piston pumps, reciprocating compressors, and refrigeration machines; and rotary seals on various valve stems.

[0003] When existing packing is used in axial sealing devices, under the continuous impact of ultra-high pressure and long-term wear, the inner diameter of the packing will inevitably increase slightly, and the sealing performance will continue to decrease. This will result in a certain gap between the ring formed inside the packing and the smooth rod, which can easily lead to poor sealing and leakage.

[0004] To address this issue, we propose a U-shaped packing with spring energy storage. Utility Model Content

[0005] The purpose of this invention is to provide a U-shaped packing with spring energy storage, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a U-shaped packing for spring energy storage, comprising a packing body and a U-shaped spring. The cross-section of the packing body is U-shaped, and elastic elements with toothed serrated edges are provided on both sides. The two elastic elements are symmetrical about the centerline of the cross-section of the packing body. The cross-section of the U-shaped spring is U-shaped, and rectangular through holes on the inner and outer sides are located on the same centerline. The U-shaped spring and the packing body are connected by overlapping steps to form a spring energy storage structure.

[0007] Preferably, the disc body has a 90° right-angle step, and the U-shaped spring has a connecting step that matches the right-angle step.

[0008] Preferably, the base body is made of high-strength polytetrafluoroethylene material, which has good ductility and high fatigue resistance, wear resistance and impact resistance. The U-shaped spring is made of chromium vanadium steel material, which has good corrosion resistance, high and low temperature resistance and oxidation resistance.

[0009] Preferably, the elastic element of the toothed serrated edge is disposed on the inner and outer sides of the disc body.

[0010] Preferably, the rectangular through holes of the U-shaped spring are evenly distributed along the axial direction.

[0011] Preferably, the structure formed by connecting the packing body and the U-shaped spring is suitable for the sealing cavity composed of the valve stem, sealing gland, packing ring and valve cover.

[0012] This invention provides a U-shaped packing with spring energy storage. This U-shaped packing with spring energy storage has the following beneficial effects:

[0013] This spring-loaded U-shaped packing, through the convergence and overlap of the U-shaped spring with the packing body, creates a certain tension in the packing, thus achieving an initial seal and improving the packing's sealing performance. It also enhances the packing's pressure resistance, high-temperature resistance, acid and alkali resistance, and extends its service life. Attached Figure Description

[0014] Figure 1 This is a schematic cross-sectional view of an embodiment of a U-shaped packing for spring energy storage according to the present invention;

[0015] Figure 2 This is a schematic diagram of the axial structure of the U-shaped spring in the U-shaped packing of the present invention for spring energy storage;

[0016] Figure 3 This is a schematic diagram of the overall axial sealing structure of a spring-energy-storing U-shaped packing according to the present invention.

[0017] In the diagram: 1. Packing body; 2. U-shaped spring; 3. Elastic element; 4. Right-angled step; 5. Step; 6. Rectangular through hole; 8. Valve stem; 9. Sealing gland; 10. Packing retaining ring; 11. Valve cover. Detailed Implementation

[0018] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0019] like Figure 1-3As shown, this utility model provides a technical solution: a U-shaped packing with spring energy storage, comprising a packing body 1 and a U-shaped spring 2. The packing body 1 is made of high-strength polytetrafluoroethylene material, which has good ductility and high fatigue resistance, wear resistance, and impact resistance. The U-shaped spring 2 is made of chromium vanadium steel material, which has good corrosion resistance, high and low temperature resistance, and oxidation resistance. The cross-section of the packing body 1 is U-shaped, and elastic elements 3 with toothed serrated edges are provided on both sides. The two elastic elements 3 are symmetrical about the centerline of the cross-section of the packing body 1. The elastic elements 3 with toothed serrated edges are arranged... On the inner and outer sides of the substrate 1, a 90° right-angled step 4 is provided inside the substrate 1. The U-shaped spring 2 is provided with a connecting step 5 that matches the right-angled step 4. The cross-section of the U-shaped spring 2 is U-shaped, and rectangular through holes 6 on the inner and outer sides are located on the same center line. The U-shaped spring 2 and the substrate 1 are connected by the overlapping step 5 to form a spring energy storage structure. The rectangular through holes 6 of the U-shaped spring 2 are evenly distributed along the axial direction. The structure formed after the substrate 1 and the U-shaped spring 2 are connected is suitable for the sealing cavity composed of valve stem 8, sealing gland 9, packing ring 10 and valve cover 11.

[0020] When using this spring-energy-storing U-shaped packing:

[0021] I. Initial Seal Formation Mechanism

[0022] Structural tension drive

[0023] The cross-section of the substrate 1 is U-shaped, and the elastic elements 3 with toothed serrated edges on both sides are symmetrically distributed along the centerline. The U-shaped spring 2 is connected to the 90° right-angled step 4 of the substrate through the step 5, forming the initial tension.

[0024] The elastic deformation of the U-shaped spring 2 (made of chrome vanadium steel) generates axial pressure, which pushes the disc body 1 to fit tightly against the surface of the valve stem 8, forming an initial sealing surface and preventing initial fluid leakage.

[0025] Material properties auxiliary

[0026] The main body 1 is made of high-strength polytetrafluoroethylene (PTFE), whose ductility allows the serrated edge elastic element 3 to adapt to the surface of the valve stem 8 and fill in micro-protrusions; fatigue resistance ensures structural stability during long-term use.

[0027] II. Dynamic Pressure Sealing Process

[0028] Fluid pressure enhanced seal

[0029] When fluid flows into the U-shaped hole of the packing, the pressure acts on the U-shaped inner cavity of the packing body 1, pushing the packing to expand radially toward the valve stem 8. At the same time, the U-shaped spring 2 generates a radial reaction force due to the fluid pressure. The superposition of the two increases the pressure on the sealing surface, forming a "pressure self-compensation" effect.

[0030] The toothed serrated elastic element 3 deforms under fluid pressure and embeds itself into the tiny gaps on the surface of the valve stem 8, further blocking the leakage path.

[0031] Spring energy storage compensates for wear

[0032] Traditional packing glands experience increased inner diameter and gaps due to wear. However, the rectangular through-hole 6 of the U-shaped spring 2 in this structure enables it to store energy: when the inner diameter of the packing gland expands due to wear, the spring releases elastic potential energy, continuously pushing the packing body 1 to retract towards the valve stem 8, compensating for the gap and maintaining stable sealing surface pressure.

[0033] III. High Pressure Resistance and Wear Resistance Mechanism

[0034] The chromium vanadium steel material of the high-pressure environment adaptable spring has high strength and fatigue resistance, and can still maintain elastic deformation ability under ultra-high pressure impact; the PTFE material of the substrate 1 has strong pressure resistance, avoiding structural deformation under high pressure.

[0035] Wear self-compensation: As the packing wears during use, the spring continuously releases stored energy, which contracts the packing body through tension, ensuring that the sealing surface always maintains tight contact, thus solving the problem of leakage caused by wear in traditional packing.

[0036] IV. Sealed Cavity Adaptation Principle

[0037] After the packing body 1 is connected to the U-shaped spring 2, it is installed into a sealing cavity consisting of valve stem 8, sealing gland 9, packing retaining ring 10 and valve cover 11. When fluid pressure acts on the U-shaped hole of the packing, the structure forms a "dynamic sealing ring": the spring tension and fluid pressure work together to make the packing form a seal in both the axial and radial directions at the same time. It is suitable for sealing scenarios of rotating shafts or valve stems of equipment such as centrifugal pumps and compressors.

[0038] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model. Furthermore, it should be noted that the components of this utility model are not limited to the overall application described above. Each technical feature described in the specification of this utility model can be used individually or in combination as needed. Therefore, this utility model naturally covers other combinations and specific applications related to the points of this utility model.

Claims

1. A U-shaped packing for spring energy storage, comprising a packing body (1) and a U-shaped spring (2), characterized in that: The cross-section of the substrate (1) is U-shaped, and elastic elements (3) with toothed serrated edges are provided on both sides. The two elastic elements (3) are symmetrical about the center line of the cross-section of the substrate (1). The cross-section of the U-shaped spring (2) is U-shaped, and rectangular through holes (6) on the same center line are provided on the inner and outer sides. The U-shaped spring (2) and the substrate (1) are connected by steps (5) to form a spring energy storage structure.

2. The U-shaped packing for spring energy storage according to claim 1, characterized in that: The base body (1) is provided with a 90° right-angle step (4), and the U-shaped spring (2) is provided with a connecting step (5) that matches the right-angle step (4).

3. The U-shaped packing for spring energy storage according to claim 1, characterized in that: The base body (1) is made of high-strength polytetrafluoroethylene material, and the U-shaped spring (2) is made of chromium vanadium steel material.

4. The U-shaped packing for spring energy storage according to claim 1, characterized in that: The elastic element (3) of the toothed serrated edge is disposed on the inner and outer sides of the substrate (1).

5. The U-shaped packing for spring energy storage according to claim 1, characterized in that: The rectangular through holes (6) of the U-shaped spring (2) are evenly distributed along the axial direction.

6. The U-shaped packing for spring energy storage according to claim 1, characterized in that: The structure formed by connecting the packing body (1) and the U-shaped spring (2) is suitable for the sealing cavity composed of the valve stem (8), sealing gland (9), packing retainer (10) and valve cover (11).

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