CN216923191U

CN216923191U - Rho-shaped sealing ring with built-in spiral spring and mounting structure thereof

Info

Publication number: CN216923191U
Application number: CN202121296545.3U
Authority: CN
Inventors: 项文武; 黄国婵
Original assignee: Shanggu Shanghai Industrial Technology Co ltd
Current assignee: Shanggu Shanghai Industrial Technology Co ltd
Priority date: 2021-06-08
Filing date: 2021-06-08
Publication date: 2022-07-08
Anticipated expiration: 2031-06-08

Abstract

The utility model discloses a rho-shaped sealing ring with a built-in spiral spring and a mounting structure thereof.A rho-shaped plate spring is wrapped outside an annular spiral spring, and the outer side surface of the end part of the rho-shaped plate spring is a main sealing surface; the rho-shaped plate spring is of a double-layer structure, the inner layer of the rho-shaped plate spring is a framework layer formed by an elastic base material, and the outer layer of the rho-shaped plate spring is a sealing layer formed by electroplating soft metal on the surface of the rho-shaped plate spring, wherein the soft metal is metal with the hardness lower than HB 40. Electroplating soft metal to fill the micro unevenness on the surface of the rho-shaped sealing ring body; on one hand, the sealing layer is provided with support, on the other hand, the spiral spring is wrapped, and a pressure cavity can be formed by means of system medium pressure, and the rho-shaped plate spring is circumferentially attached to each relevant part needing sealing by means of system pressure. The utility model can adapt to high temperature and high pressure radiation resistance or ultra-low temperature and ultra-low pressure, and particularly relates to a sealing ring device with enough compensation capability.

Description

Rho-shaped sealing ring with built-in spiral spring and mounting structure thereof

Technical Field

The utility model belongs to the technical field of shaft sealing, and particularly relates to a sealing device for shaft parts under the working conditions of high temperature, high pressure, nuclear radiation or low temperature and low pressure fluid medium.

Background

For the shaft and shaft sleeve sealing under high temperature, high pressure and high dose nuclear radiation and complex working conditions, the sealing ring material is required to resist temperature of more than 350 ℃ to 650 ℃ or higher, the pressure resistance is more than 50MPa to 300MPa or higher, and the sealing piece is required to resist high dose nuclear radiation, such as a nuclear reactor pressure vessel of a nuclear power plant, a pipeline pump valve assembly of the nuclear reactor pressure vessel and a nuclear island control rod driving mechanism. And the sealing ring is different from the conventional non-metal sealing ring in high-temperature engines, high-pressure forming extruders and large machines.

In addition, for the equipment with ultralow temperature and ultralow pressure working temperature, the sealing piece is required to be capable of adapting to ultralow temperature of-250 ℃ and ultralow temperature of 10 DEG C^-6pa ultra low pressure application conditions.

The nonmetal shaft seal with built-in spring used in the prior art is made of PTFE, nylon and polyurethane, and the body of the seal ring has high temperature resistance of not more than 250 ℃, low temperature resistance of not less than-40 ℃ and radiation resistance, thus the use requirement cannot be met. And like a graphite packing or a graphite ring, the sealing reliability is poor, dust is easy to fall off, and a larger installation space is needed.

In the prior art, a metal top-opening spring-enhanced C-shaped sealing ring is further arranged, but the limitation that the structural compression cannot be too large results in limited compensation capacity of the spring, which is an important defect existing in a metal top-opening spring, so that improvement is urgently needed, and the design of the sealing ring which can adapt to high-temperature and high-pressure radiation resistance or ultra-low temperature and ultra-low pressure, especially a sealing ring with a new structure and large enough compensation capacity is designed.

Disclosure of Invention

The utility model aims to overcome the defects of the sealing ring in the prior art and provide a sealing ring device which can adapt to high temperature, high pressure, radiation resistance or ultralow temperature and ultralow pressure and particularly has enough compensation capacity.

The purpose of the utility model is realized by the following technical scheme.

A rho-shaped sealing ring with a built-in spiral spring is characterized in that a rho-shaped plate spring is wrapped outside an annular spiral spring, and the outer side surface of the end part of the rho-shaped plate spring is a main sealing surface; the rho-shaped plate spring is of a double-layer structure, the inner layer of the rho-shaped plate spring is a framework layer formed by an elastic base material, and the outer layer of the rho-shaped plate spring is a sealing layer formed by electroplating soft metal on the surface of the rho-shaped plate spring, wherein the soft metal is metal with the hardness lower than HB 40.

Electroplating soft metal to fill the micro unevenness on the surface of the rho-shaped sealing ring body; on one hand, the sealing layer is provided with support, on the other hand, the spiral spring is wrapped, and a pressure cavity can be formed by means of system medium pressure, and the rho-shaped plate spring is circumferentially attached to each relevant part needing sealing by means of system pressure.

When the shaft or the shaft sleeve is loosened, the extruded spiral spring can provide certain compensation force to make the sealing ring compensate a gap possibly generated between the shaft and the shaft sleeve. In addition, the structural design of the whole section of the product is to enable the pressure in the system to act on the inner cavity of the whole sealing ring at the same time, so that the system pressure can force the joint force of the long edge of the sealing ring and the shaft to be tighter, and the reliable sealing effect is achieved.

Preferably, the main sealing surface is provided with a cutting edge and a sealing lip, and the width of the sealing span of the cutting edge forming the contact zone is 0.25-0.5 mm. According to the sealing principle, the complete sealing is completely rooted in the establishment of a complete closed curve. The cutting edge is arranged on the sealing surface, so that the purpose of establishing a closed curve is achieved.

In a preferable scheme, when the working temperature range is-250 ℃ to +815 ℃, the soft metal is electroplated silver, gold or copper; when the working temperature range exceeds 815 ℃, soft nickel is electroplated; the thickness of the electroplating layer is 0.02-0.05 mm; the contact surface roughness Ra of each related part is lower than 0.4 um; the material of the framework layer and the coil spring is 316L/304/inconel 718/inconel-750.

The optimized scheme is that the device comprises a shaft sleeve which is matched with a shaft sealing part of the device and is fixedly connected with a machine body of the device, a sealing ring seat is arranged at the front end of the shaft sleeve, a rho-shaped opening of a rho-shaped sealing ring arranged in the sealing ring seat faces to the direction of fluid pressure, and the depth of the sealing ring seat is smaller than the height of the rho-shaped sealing ring by a certain dimension; a shaft cover is arranged corresponding to the front end face of the shaft sleeve, the shaft cover and the shaft sleeve are fixedly connected through bolts in a gap-adjustable mode and extrude the rho-shaped plate spring and the spiral spring, and the gap-adjustable mode is that the thickness of a fit gap can be adjusted to ensure that the shaft cover can press the front end face of the rho-shaped sealing ring at the pressure required by design; the outer or/and inner diameter of the p-ring is expanded by the elastic force plus fluid expansion pressure to press seal against the inner surface of the sleeve and the shaft.

According to the preferable scheme, when the sealing ring is used under the working condition of ultrahigh temperature or ultralow temperature, related parts comprise a sealing ring seat, a shaft cover, a bolt and a rho-shaped sealing ring which are made of the same material.

Preferably, the pressing amount of the shaft cover and the sealing ring seat is adjustable and is provided with a locking structure.

The utility model has the beneficial effects that:

1. according to the utility model, the spiral spring is wrapped by the rho-shaped plate spring, the rho-shaped plate spring and the spiral spring are both elastic elements, and the contact force of the sealing surface is stronger under the combined action of the rho-shaped plate spring and the spiral spring, so that the compensation effect is far better than that of a conventional sealing ring, and the rho-shaped plate spring has great pressure adaptability.

2. The integral material is inconel718 or inconel X-750, which is high temperature resistant, corrosion resistant, relaxation resistant and radiation resistant, and has excellent temperature adaptability and working medium adaptability.

3. The structure of the rho-shaped plate spring is similar to that of a non-contact volute spiral spring on the cross section, the characteristic curve of the rho-shaped plate spring is similar to that of a torsion spring, and the external moment and the angular deformation are in a linear relation, so that the sealing effect is prevented from changing due to the inflection point caused by the change of the working condition.

4. The rho-shaped plate spring mouth faces to the direction of fluid pressure, and the pressure fluid fills the rho-shaped plate spring inner cavity to form auxiliary sealing pressure.

5. The soft metal layer is electroplated on the outer surface of the rho-shaped plate spring, so that the rho-shaped plate spring made of metal materials is not as flexible as the elastic rubber ring, and meanwhile, the smoothness of a matching surface is improved, or the roughness is reduced, and the defect of micro unevenness of the metal materials is overcome.

6. The elasticity can be adjusted by adjusting the compression degree of the sealing ring, the most accurate compression degree can be designed and locked by an adjusting mechanism or according to sufficient data, and the initial installation of the sealing ring is facilitated.

Drawings

FIG. 1 is a schematic view of a p-ring seal of the present invention with the sealing surface facing inward;

FIG. 2 is a schematic view of a p-ring seal of the present invention with the sealing surface facing outward;

FIG. 3 is a schematic view of the installation structure of the p-shaped sealing ring in FIG. 1;

fig. 4 is a schematic view of the mounting structure of the ρ -shaped seal ring shown in fig. 2.

In the figure: a rho-shaped seal ring 1; a coil spring 2; a rho-shaped leaf spring 3; a main sealing surface 4; a skeleton layer 5; a sealing layer 6; a cutting edge 7; a shaft 8; a shaft sleeve 9; a seal ring seat 10; a shaft cover 11;

RS represents the width of the ρ -ring 3;

AS represents the height of the ρ -shaped plate spring 3;

MT denotes the thickness of the ρ -shaped leaf spring 3;

DSI denotes the inner diameter of the ρ -shaped leaf spring 3 inward of the main sealing surface 4;

DSO denotes the outer diameter of the ρ -shaped leaf spring 3 outward of the main sealing surface 4.

BD denotes the outer diameter of the seal ring seat 10 of the sleeve 9;

SD represents the shaft 8 outer diameter;

gap represents the installation Gap between the shaft 8 and the inner diameter of the shaft sleeve 9;

WG denotes a mounting groove width of the seal ring seat 10;

GD denotes the depth of the seal ring seat 10;

DC denotes an initial installation gap between the ρ -shaped seal ring 1 and the seal ring seat 10;

r represents the bottom chamfer of the seal ring seat 10.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

Example 1: as shown in fig. 1, a rho-shaped seal ring 1 with a built-in spiral spring is characterized in that a rho-shaped plate spring 3 is wrapped outside an annular spiral spring 2, and the outer side surface of the end part of the rho-shaped plate spring 3 is a main sealing surface 4; the rho-shaped plate spring 3 is of a double-layer structure, the inner layer of the rho-shaped plate spring is a framework layer 5 formed by an elastic base material, the outer layer of the rho-shaped plate spring is a sealing layer 6 formed by electroplating soft metal on the surface, the soft metal refers to metal with the hardness lower than HB40, and the electroplated soft metal layer is used for filling up the micro surface unevenness of the rho-shaped plate spring 3 body of the rho-shaped sealing ring 1 matched with a shaft; the rho-shaped plate spring 3 provides support for the sealing layer 6 and wraps the spiral spring 2, a pressure cavity can be formed by means of system medium pressure, and the rho-shaped plate spring 3 is extruded by means of the system pressure to enable the periphery of the rho-shaped plate spring to be more beneficial to being attached to a shaft needing sealing. The inner helical spring 2 provides an additional compensating force for the p-shaped sealing ring 1. The annular spiral spring 2 is formed by winding a cylindrical spiral spring into an annular shape, then welding the cylindrical spiral spring by argon arc, grinding and polishing, and the rho-shaped plate spring 3 body of the rho-shaped sealing ring 1 is welded by the same method. The main sealing surface 4 of the rho-shaped sealing ring 1 has an inward structure or an outward structure according to different application occasions of the rho-shaped sealing ring 1. Fig. 2 is a schematic view of the main seal surface 4 of the p-shaped seal ring 1 facing outward.

The main sealing surface 4, namely the outer side sealing surface of the rho-shaped plate spring 3 is provided with a cutting edge 7 and a sealing lip, and the sealing span width of the cutting edge 7 forming the contact zone is 0.25-0.5 mm.

When the rho-shaped sealing ring 1 is applied to a working temperature range of-250 ℃ to +815 ℃, the soft metal is electroplated silver, gold or copper; electroplating soft nickel when the temperature range of the electroplating solution is over 815 ℃; the thickness of the electroplating layer is 0.02-0.05 mm; the roughness of the contact surface of each related part, including the roughness of the main sealing surface 4 of the rho-shaped sealing ring 1 and the matching surface of the related parts, is lower than Ra 0.4 um. The material constituting the skeleton layer 5 and the material constituting the annular coil spring 2 are 316L/304/inconel718/inconel x-750. In order to adapt to high-temperature application conditions, the high-temperature resistance of the latter two materials is better, and the mechanical property of the spring is in better linear change.

The sealing layer 6 may also be electroplated with tin or lead if the operating temperature range is below 200 c.

In fig. 1 and 2, RS indicates the width of the ρ -ring 3; AS represents the height of the ρ -shaped plate spring 3; MT denotes the thickness of the ρ -shaped leaf spring 3; DSO denotes the outer diameter of the ρ -shaped leaf spring 3 outward of the main seal face 4; DSI denotes the inner diameter of the p shaped leaf spring 3 inwardly of the main sealing surface 4.

Example 2: the installation structure of the rho-shaped seal ring 1 with the built-in spiral spring 2 comprises any one of the installation structures of the rho-shaped seal ring 1 of the embodiment 1, the installation structure is provided with a shaft sleeve 9 which is matched with a shaft 8 sealing part of applied equipment and is fixedly connected with a machine body of the equipment, the front end of the shaft sleeve 9 is provided with a seal ring seat 10, a rho-shaped opening of the rho-shaped seal ring 1 installed in the seal ring seat 10 faces to the direction of fluid pressure, and the depth of the seal ring seat 10 is smaller than the height AS of the rho-shaped seal ring 1 by a certain dimension; a shaft cover 11 is arranged corresponding to the front end face of the shaft sleeve 9, the shaft cover 11 and the shaft sleeve 9 are fixedly connected through bolts in a gap-adjustable mode and extrude the rho-shaped plate spring 3 and the spiral spring 2, and the gap-adjustable mode means that the thickness of a fit gap can be adjusted to ensure that the shaft cover 11 can press the front end face of the rho-shaped sealing ring 1 at the pressure required by design; the outer or/and inner diameter of the p-ring 1 is expanded by the elastic force plus the fluid expansion pressure to press seal against the inner surface of the sleeve 9 and the shaft 8. The roughness of the sealing coupling surface of the shaft neck and the sealing ring seat 10 is lower than Ra 0.4 um. See fig. 3, 4.

In addition, it should be noted that when the operating temperature is in the ultra-high temperature or ultra-low temperature range, in order to avoid the difference in the expansion coefficients of the sealing member and the sealed substrate, the sealing performance may be damaged when the sealing member is used under the ultra-high temperature or ultra-low temperature condition, so the sealing member and the sealed couple, including the connecting bolt, the shaft cover 11 and the seal ring seat 10, must be simultaneously selected from the same material.

The pressing distance between the shaft cover 11 and the seal ring seat 10 is adjustable, and the locking structure adjusting mechanism comprises a threaded structure or a gasket.

When the device is in a working state, the rho-shaped sealing ring 1 and the spiral spring 2 in the rho-shaped sealing ring 1 are subjected to axial pressure of the shaft cover 11, the whole rho-shaped sealing ring 1 is deformed, the spiral spring 2 can force the rho-shaped sealing ring 1 body which is in tight sealing contact with the rho-shaped sealing ring to be tightly attached to the circumferential surface of a shaft 8 to be sealed, and when the shaft 8 or a shaft sleeve 9 is loosened, the extruded spiral spring 2 can provide certain compensation force to enable the rho-shaped sealing ring 1 to compensate a gap which may be generated between the shaft 8 and the shaft sleeve 9. In addition, the structural design of the whole section of the product is to enable the pressure in the system to act on the inner side of the integral rho-shaped sealing ring 1 at the same time, so that the system pressure can force the cutting edge 7 at the long edge end part of the rho-shaped sealing ring 1 to be contacted with the shaft 8 more tightly, and the reliable sealing effect is achieved.

When the high-temperature high-pressure seal ring works under similar working conditions, high-temperature high-pressure gas medium can flow to the seal ring seat 10 through a gap between the shaft 8 and the shaft sleeve 9, and the rho-shaped seal ring 1 is installed on the seal ring seat 10 to prevent the high-temperature high-pressure medium from flowing outwards.

Compared with the structure of the traditional metal upper opening end face sealing ring, the utility model is beneficial to the axial pressure to lead the rho-shaped plate spring 3 and the spiral spring 2 to generate deformation and generate transverse extrusion force and compensation action, thus having great effect on assembly and maintaining the sealing performance, and the sealing performance can be improved by one order of magnitude compared with the traditional sealing ring.

In fig. 3 and 4, BD represents the outer diameter of the seal ring seat 10 of the sleeve 9; SD represents the shaft 8 outer diameter; gap represents the installation Gap between the shaft 8 and the inner diameter of the shaft sleeve 9; WG denotes a mounting groove width of the seal ring seat 10; GD denotes the depth of the seal ring seat 10; DC denotes an initial installation gap between the ρ -shaped seal ring 1 and the seal ring seat 10; r represents the bottom chamfer of the seal ring seat 10.

The depth of the seal ring seat 10 indicated by GD is used for adjusting the pressing amount of the shaft cover 11 against the rho-shaped seal ring 1, i.e. the transverse deformation amount of the rho-shaped seal ring 1 can be adjusted, so that the rho-shaped seal ring 1 comprises the cutting edge 7 of the main seal surface 4 and the pressing force and the compensating force of each matching surface of the seal ring seat 10.

Because an installation Gap between the inner diameters of the shaft 8 and the shaft sleeve 9 represented by Gap and an initial installation Gap between the rho-shaped sealing ring 1 and the sealing ring seat 10 represented by DC exist, the rho-shaped sealing ring 1 can be easily installed on the sealing seat 10, and then the shaft cover 11 is pressed, so that the rho-shaped sealing ring 1 can fully ensure the sealing effect.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A rho-shaped sealing ring with a built-in spiral spring is characterized in that a rho-shaped plate spring is wrapped outside an annular spiral spring, and the outer side surface of the end part of the rho-shaped plate spring is a main sealing surface; the rho-shaped plate spring is of a double-layer structure, the inner layer of the rho-shaped plate spring is a framework layer formed by an elastic base material, and the outer layer of the rho-shaped plate spring is a sealing layer formed by electroplating soft metal on the surface of the rho-shaped plate spring, wherein the soft metal is metal with the hardness lower than HB 40.

2. The p-ring according to claim 1, wherein the main seal surface is provided with a cutting edge and a seal lip, and the width of the cutting edge seal span constituting the contact zone is 0.25 to 0.5 mm.

3. The p-ring according to claim 1 or 2, wherein said soft metal is plated with silver, gold or copper at an operating temperature ranging from-250 ℃ to +815 ℃; electroplating soft nickel when the working temperature range exceeds 815 ℃; the thickness of the electroplating layer is 0.02-0.05 mm; the contact surface roughness Ra of each related part is lower than 0.4 um; the material of the framework layer and the coil spring is 316L/304/inconel 718/inconel-750.

4. The structure for mounting the rho-shaped sealing ring with the built-in spiral spring is characterized in that the structure is provided with a shaft sleeve which is matched with a shaft sealing part of equipment and is fixedly connected with a machine body of the equipment, the front end of the shaft sleeve is provided with a sealing ring seat, a rho-shaped opening of the rho-shaped sealing ring mounted in the sealing ring seat faces to the direction of fluid pressure, and the depth of the sealing ring seat is smaller than the height of the rho-shaped sealing ring by a certain dimension; a shaft cover is arranged corresponding to the front end face of the shaft sleeve, the shaft cover and the shaft sleeve are fixedly connected through bolts in a gap-adjustable mode and extrude the rho-shaped plate spring and the spiral spring, and the gap-adjustable mode is that the thickness of a fit gap can be adjusted to ensure that the shaft cover can press the front end face of the rho-shaped sealing ring at the pressure required by design; the outer or/and inner diameter of the p-ring is expanded by the elastic force plus fluid expansion pressure to press seal against the inner surface of the sleeve and the shaft.

5. The structure for mounting a p-type seal ring of an internal coil spring according to claim 4, wherein the related parts including the seal ring seat, the shaft cover, the bolt and the p-type seal ring are made of the same material when used under the ultra-high temperature or ultra-low temperature conditions.

6. The structure for mounting a p-ring seal of an internal helical spring as claimed in claim 5, wherein a pressing distance between the shaft cover and the seal ring seat is adjustable and has a locking structure.