CN211449927U - Special-shaped sealing ring and improved annular pressure type pipe fitting - Google Patents

Abstract

The application discloses dysmorphism sealing washer and improved generation ring pressure formula pipe fitting, including integrated into one piece's rubber seal component with set up at least one bulge loop on the rubber seal component inner wall. The special-shaped sealing ring is a sealing element of a non-standard structure made of rubber or silicon rubber materials, and the main structure of the special-shaped sealing ring comprises a rubber sealing element and one or more convex rings integrally connected to the inner wall of the rubber sealing element. The annular pressure pipe fitting has the advantages of good static and dynamic sealing performance, strong pressure resistance and good bending resistance, and solves the problems that the existing annular pressure pipe fitting is not bending resistant and sealing failure is easy to occur after the pipe is bent.

Description

Special-shaped sealing ring and improved annular pressure type pipe fitting

Technical Field

The utility model belongs to the technical field of the tubular product pipe fitting and specifically relates to a sealing connection device field of tubular product pipe fitting, concretely relates to dysmorphism sealing washer and improved generation ring pressure formula pipe fitting.

Background

The existing stainless steel pipe fitting sealing modes can be mainly divided into O-shaped ring sealing, thread sealing and annular pressure sealing. The O-shaped ring seal has the greatest advantages of convenience in installation, good sealing performance, low structural requirement on the connecting piece and realization of the sealing effect through compression of the O-shaped ring.

The thread sealing provides pressure through threaded connection, and then the component contact sealing surface needing to be sealed is filled and compacted through sealing materials, so that the sealing effect is realized, the thread sealing has the advantages of facilitating installation and disassembly, bearing pressure values are relatively high, but the structural requirements on the components sealed mutually are high, an independent sealing surface needs to be manufactured, a sealing head needs to be manufactured independently for the thin-wall pipe fitting, and otherwise, the thread sealing cannot be adopted.

The ring-pressing type stainless steel pipe fitting is another novel pipeline connecting piece with high cost performance. The ring-pressing stainless steel pipe has the characteristics of good static sealing performance and cavity type sealing, and the sealing material is cylindrical silicon rubber or other rubber. The static sealing effect of the ring pressing type sealing mode can be achieved, but the thickness of the sealing element cannot be increased due to the fact that the ring pressing type pipe is thin-walled, and therefore the defect that the flexibility resistance is weak exists. If the pipe passes through the ring-pressing type seal, the ring-pressing joint part is easy to leak due to the deflection deformation, thereby causing the seal failure.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the anti-bending ability that current thin wall stainless steel pipe ring pressure or pipe fitting sealing technique exist is weak, this application provides a dysmorphism sealing washer and improved generation ring pressure formula pipe fitting. The device is used for replacing the existing annular compression type pipe fitting and solving the problem that the existing annular compression type pipe fitting is weak in bending resistance.

Firstly, it is right the utility model discloses before the technique is elucidated, to the principle that the anti flexible ability of current ring die type pipe fitting is weak with the utility model discloses fundamentally solves the principle that the anti flexible ability of ring die type sealing washer is weak and contrasts the description. The main problem to solve the problem of bending resistance is that after the pipe is bent, internal stress, even deformation and displacement are generated at the joint, although the value is very small, the sealing failure is easily caused, and leakage occurs. The best mode for solving the technical problem is to increase the thickness of the sealing element, so that the sealing element has enough deformation to compensate or fill the deformation or displacement and keep a good sealing state; however, since the port of the thin-walled stainless steel pipe fitting is thin, the port accommodating the seal cannot be further enlarged, or else, the annular pressure seal cannot be realized. Therefore, based on this reason, the applicant utility model discloses a dysmorphism sealing washer is used for replacing the present tube-shape thick skin rubber of equal thickness, can enough satisfy the ring pressure requirement, also can be better simultaneously provide sealed effect, and the flexure-resistant sealing performance obviously increases.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

a contour seal includes a field-in-situ groove-formed rubber seal element end and a seal element having at least one raised ring disposed on an outer wall of the rubber seal element. The main structure of the rubber sealing element comprises a cylindrical rubber sealing element and one or more convex rings integrally connected to the inner wall of the rubber sealing element. The rubber sealing element is used for being sleeved on a rubber sealing element material, and when the annular pressure is carried out, the rubber sealing element deforms along with the deformation of the expansion section of the pipe fitting, so that the circumference of the cross section where the rubber sealing element is located at the annular pressure position receives the pressure from the pipe fitting, the rubber sealing element is only attached to the outer surface of the pipe fitting, and the sealing is realized. However, this sealing state is not substantially different from the existing ring-pressing type sealing, and when the pipe is subjected to other external forces, the pipe is deformed and bent, and a composite external force from the radial direction and the axial direction is applied to the ring-pressing position, so that in this case, the rubber sealing element is stressed unevenly, and sealing failure is easily caused. However, the bulge loop that sets up on the rubber seal component inner wall in this application because cross-sectional thickness can obviously be higher than rubber seal component's thickness, so its elastic deformation ability can be high a lot, takes place under the circumstances of buckling at tubular product, and deformation or the tiny displacement change that produces to joint department, the self elastic deformation volume of bulge loop is enough to compensate with the self-adaptation and fill, still can reach good sealed effect. The special-shaped sealing ring is the key point for improving the bending resistance of the ring-shaped pressure type pipe. The technical problem is that the technical problem puzzles the pipe industry for many years, and the mode for solving the problem at present is to select other sealing connection modes with higher cost, or to reconnect the joint for maintenance after the bending leakage occurs due to long-time use, and the technical problem of the bending-resistant sealing of the annular pressure type pipe fitting is not fundamentally solved.

In order to meet the requirements for the connection of thin-walled pipe fittings of each size DN15-DN100, it is preferable that the radial height of the convex rings is 1.4-4.9mm in the order named and the axial width of the convex rings is 2.5-9mm in the order named as table four. It is noted that the dimensions of the articles of manufacture constructed in accordance with the teachings of the present application, including but not limited to the dimensional ranges disclosed above, may be increased to even larger dimensions as long as the dimensions of the mating swaged tubular are met without the problems of fracturing the tubular or failing seals due to insufficient swage. But at present do not need, its reason is according to the regulation of national standard GB/T33926 and GB/T19228.1, and the tubular product specification of mainly using is DN15-DN100, surpasss DN100 and belongs to super large bore tubular product, and the pressure that its bore and application range have been unsuitable adopts the thin wall to can not adopt ring pressure formula sealing connection, so the size of above-mentioned bulge loop is only for compatible current thin wall tubular product, improves the utility model discloses a practicality, not the utility model discloses can make and the limit of using.

Preferably, the cross-sectional shape of the convex ring is semicircular or trapezoidal. The convex ring is preferably semicircular due to the fact that best ring pressure protection is needed for the ring pressure pipe, and stress concentration after cracks are avoided. As will be appreciated by those skilled in the art, because the ring pressure is a line seal with stress concentration rather than a face seal, the sealing effect can be achieved with trapezoidal and rectangular cross sections, as well as flexure resistance.

Secondly, the utility model also provides a be used for supporting the improved generation ring crush pipe fitting of dysmorphism sealing washer specifically as follows:

an improved annular pressing type pipe fitting comprises a pipe and a pipe fitting which are nested and inserted into each other, wherein the special-shaped sealing ring is arranged between the pipe and the pipe fitting.

Preferably, the end of the pipe fitting comprises a nesting section for inserting the pipe in a socket fit manner, the nesting section continues to expand outwards to form an expansion section with a diameter larger than that of the nesting section, and the special-shaped sealing ring can be installed in a space between the inner wall of the expansion section and the pipe.

Preferably, the pipe is provided with a concave ring formed by ring pressing and used for accommodating the convex ring. The concave ring is used for accommodating the convex ring, the sectional area of the concave ring is equal to that of the convex ring in a natural state, and after ring compression molding, the compressed convex ring can compensate and realize the maintenance of sealing under the elastic deformation capacity of the concave ring when the pipe is subjected to bending deformation.

In order to better realize the utility model discloses, this application still supports the installation method who provides an improved generation ring pressure formula pipe fitting, specifically contains following step:

s10, measuring and determining the position of the concave ring, namely measuring and determining the axial distance from the concave ring to the end face of the pipe to be annularly pressed on the end of the pipe according to the distance of the embedded section of the pipe to be annularly pressed and connected;

width and depth of S20 concave ring: or pressing the groove according to L in the standard table, and obtaining the groove in the standard table IV; the method comprises the following steps that (1) the size of a convex ring arranged on a special-shaped sealing ring to be installed is determined, and the volume of the convex ring is equal to the volume of a concave ring after the convex ring is compressed according to the radial height h and the axial width l of the convex ring;

s30 groove pressing: forming concave rings on the pipe fitting by using a grooving machine or a hydraulic machine, wherein the number and the spacing distance of the concave rings are consistent with those of convex rings on the special-shaped sealing ring; the specific parameters are consistent with the data listed in the fourth table;

s40, mounting a special-shaped sealing ring: sleeving a special-shaped sealing ring with a convex ring on the pipe and aligning the convex ring with the concave ring;

assembling the pipe and the pipe fitting in an S50 mode: inserting the pipe in the step S40 into the pipe until the end face of the pipe contacts the bottom of the nesting section of the pipe;

s60 ring pressing: standard ring-pressing tools are arranged in GB/T33926 to perform ring-pressing at a location between the end face of the pipe element and the collar closest to the end face. After molding, the diameter of the socket and the ring pressure part is reduced to form sealing according to 15% -30% of the thickness twice of rubber.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a perspective view of a profiled sealing ring;

FIG. 2 is a top view of the contour seal ring;

FIG. 3 is a sectional view taken along the line A-A in FIG. 2;

FIG. 4 is an enlarged view of the structure of region A in FIG. 3;

FIG. 5 is a cross-sectional view of the single lug ring sleeved with the tube;

FIG. 6 is a cross-sectional view of the connection of the double-convex ring and the pipe;

FIG. 7 is a cross-sectional view of a single lug connection (not swaged);

FIG. 8 is a cross-sectional view of a double-torus pipe connection (not swaged);

FIG. 9 is a cross-sectional view of a single torus pipe element ring press;

FIG. 10 is a cross-sectional view of a double-torus pipe fitting ring press;

FIGS. 11-13 are schematic diagrams illustrating the assembly of a conventional ring-press type pipe fitting structure;

figure 14 is a half cross-sectional view of a 90 ° elbow fitting;

fig. 15 is a partial cross-sectional view of the 90 ° elbow fitting of the present invention after one end is ring pressed;

reference numerals: 1-a special-shaped sealing ring; 2-a rubber sealing element; 3-a convex ring; 4-tubing; 5-a concave ring; 6-pipe fitting; 7-an expansion section; 8-a nesting section; l-the axial width of the bulge loop; h-the radial height of the bulge loop.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is also to be understood that the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited.

Example 1:

a profiled sealing ring as shown in figures 1 to 8 of the accompanying drawings, comprising an integrally formed rubber sealing element 2 and at least one raised ring 3 arranged on the inner wall of said rubber sealing element 2. The special-shaped sealing ring 1 is a sealing element of a non-standard structure made of rubber or silicon rubber materials, and the main structure of the special-shaped sealing ring comprises a rubber sealing element 2 and one or more convex rings 3 integrally connected to the inner wall of the rubber sealing element 2. The rubber sealing element 2 is used for being sleeved on the pipe 4, and when the pipe is annularly pressed, the rubber sealing element 2 deforms along with the deformation of the expansion section 7 of the pipe 6, so that the circumference of the cross section of the rubber sealing element 2 at the annularly pressing position receives pressure from the pipe 6, the rubber sealing element 2 is tightly attached to the inner surface and the outer surface of the pipe 4, and sealing is achieved. However, this sealing state is not substantially different from the conventional annular pressure type sealing, and when the pipe 4 is subjected to other external forces, it is deformed and bent, and a composite external force from the radial direction and the axial direction is applied to the annular pressure portion, so that in this case, the stress of the rubber sealing element 2 is not uniform, and the sealing failure is easily generated. However, the bulge loop 3 that sets up on the 2 inner walls of rubber seal element in this application because cross-sectional thickness can obviously be higher than the thickness of rubber seal element 2, so its elastic deformation ability can be a lot of, and under the condition that tubular product 4 takes place to deflect, deformation or the little displacement change that produces to joint department, the self elastic deformation volume of bulge loop 3 is enough to compensate and self-adaptation is filled, still can reach good sealed effect. The special-shaped sealing ring 1 is the key point for improving the bending resistance of the ring-shaped pressure type pipe. The technical problem is that the technical problem puzzles the pipe industry for many years, and the mode for solving the problem at present is to select other sealing connection modes with higher cost, or to reconnect the joint for maintenance after the bending leakage occurs due to long-time use, and the technical problem of the bending-resistant sealing of the annular pressure type pipe fitting is not fundamentally solved.

In order to meet the requirement of connecting thin-walled pipes with more sizes, in the present embodiment, the radial height of the convex ring 3 is 1.4-4.9mm in the order h, and the axial width of the convex ring 3 is 2.5-9mm in the order l, as shown in table four. It is noted that the dimensions of the articles of manufacture constructed in accordance with the teachings of the present application, including but not limited to the dimensional ranges disclosed above, may be increased to even larger dimensions as long as the dimensions of the mating swaged tubular are met without the problems of fracturing the tubular or failing seals due to insufficient swage. But at present do not need, its reason is according to the regulation of national standard GB/T33926 and GB/T19228.1, and the tubular product specification of mainly using is DN15-DN100, surpasss DN100 and belongs to super large bore tubular product, and the pressure that its bore and application range have been unsuitable adopts the thin wall to can not adopt ring pressure formula sealing connection, so above-mentioned bulge loop 3's size is only for compatible current thin wall tubular product, improves the utility model discloses a practicality, not the utility model discloses can make and the limit of use. In order to further highlight the bending resistance of the profiled sealing ring in the embodiment, the applicant shows and discusses the wall thickness and maximum compression of the tubular thin-skin rubber of the existing ring-compression type pipe fitting as follows:

table one: national Standard of GB/T33926 (length units: mm; hardness units: Shore hardness/Degrees)

Those skilled in the art will recognize that:

1. the reliability of the line seal is higher than that of the surface seal;

2. the O-shaped ring is used for sealing the cylindrical rubber;

3. GB/T33926 face seal is many times worse than the O type seal of GB/T19928.1;

4. after the sealing of the inner convex ring is changed, the sealing effect of GB/T33926 is improved.

The following contents are the rubber thickness and bending deflection resistance of the GB/T19928.1 clamping type pipe fitting as follows (O-shaped ring):

table two: national Standard of GB/T19228.1 (length unit: mm; hardness unit: Shore hardness/degree)

As can be seen from table 1, the magnitude of the elastic compression of the sealing member is generally related to the material of the sealing member, and the maximum elastic compression of the rubber sealing member is generally 30% of the natural state, wherein the compression for achieving the contact seal for offsetting the fluid pressure is generally 20% and 10% is reserved as a compensation margin, otherwise, leakage is easy to occur when the fluid pressure fluctuates and peak pressure occurs. However, the 10% of the reserved compensation margin in table one is significantly lower than the compensation margin of the O-ring in table 2. Therefore, the product of GB/T19228.1 is obviously better than GB/T33926 in the aspect of bending deflection, and basically reaches 2.5-4.55 times of the traditional annular pressing type; however, in practice, the products of GB/T19228.1 were found to have poor flex resistance. Therefore, when the special-shaped sealing ring 1 in the embodiment is adopted according to the parameter requirement of a large-size thin-wall pipe fitting of DN100, the designed height is 4.9mm, the 10% compensation allowance is 0.49 mm, and is nearly 2.5 times of the compensation allowance of an O-shaped ring rubber ring in GB/T19228.1, after ring pressing, the static sealing pressure resistance and the deflection resistance allowance are obviously better than the data in Table II, and the sealing effect of GB/T33926 is improved.

The details are as follows: (GB/T33926 pipe rubber thickness and bending deflection resistance)

Table three: error of cylindrical thin rubber wall thickness and maximum compression scale in ring pressing type pipe fitting is +/-10% (length unit: mm; hardness unit: Shore hardness/degree)

In this embodiment, the cross-sectional shape of the protruding ring 3 is a semicircle or a trapezoid. The convex ring 3 is preferably semicircular or trapezoidal because the best ring pressure protection is required for the ring pressure pipe to avoid stress concentration after cracks appear.

Example 2:

an improved annular pressing type pipe fitting shown in the attached drawings 1-8 in the specification comprises a pipe 4 and a pipe 6 which are nested and inserted into each other, and the special-shaped sealing ring 1 in the embodiment 1 is arranged between the pipe 4 and the pipe 6.

In this embodiment, the end of the pipe fitting 6 includes a nesting section 8 for receiving the pipe 4, the nesting section 8 continues to expand outward to form an expansion section 7 with a diameter larger than that of the nesting section 8, and the special-shaped sealing ring 1 is installed in a space between the inner wall of the expansion section 7 and the pipe 4.

In this embodiment, the tube 4 has a female ring 5 formed by a groove of a channeling machine to receive the male ring 3. The concave ring 5 is used for accommodating the convex ring 3, the sectional area of the concave ring 5 is equal to the sectional area of the convex ring 3 in a natural state, and after ring compression molding, the compressed convex ring 3 can compensate under the elastic deformation capacity of the concave ring to realize the maintenance of sealing when the pipe 4 is compressed and deformed.

Example 3:

the embodiment provides an improved installation method of an annular pressure type pipe fitting, so as to ensure the matching and sealing installation of the special-shaped sealing ring 1, the pipe 4 and the pipe fitting 6 in the embodiments 1 and 2, and as shown in the attached drawings 1 to 10 of the specification, the method specifically comprises the following steps:

s10, measuring and determining the position of the concave ring 5 according to the data in the table IV, namely measuring and determining the axial distance from the concave ring 5 to the end surface of the pipe 4 to be annularly pressed on the pipe 4 according to the distance of the embedded section 8 of the pipe 6 to be annularly pressed and connected;

s20 measures and determines the width and depth of the female ring 5 according to the dimensions in table four: the method comprises the following steps that (1) the specification of a convex ring 3 arranged on a special-shaped sealing ring 1 to be installed is determined, and a fixed value is selected according to 70% of the radial height h and the axial width l of the convex ring 3;

s30 groove pressing: forming concave rings 5 on the pipe fitting 4 by using a channeling machine or a hydraulic machine to press grooves, wherein the number and the spacing distance of the concave rings 5 are consistent with those of the convex rings 3 on the special-shaped sealing ring 1, and the specific size is shown in the fourth table;

s40, mounting the special-shaped sealing ring 1: sleeving a special-shaped sealing ring 1 with a convex ring 3 on the port of a pipe 4, and aligning the convex ring 3 with a concave ring 5;

s50 assembling the pipe 4 and the pipe 6: inserting the tube 4 in the step S40 into the pipe 6 until the end surface of the pipe 4 contacts the bottom of the nesting section 8 of the pipe 6;

s60 ring pressing: the pipe element 6 is ring-pressed between its end face and the collar 3 closest to the end face and between the nesting section 8 and the closest collar 3 using the standard ring-pressing tool described in GB/T33926, in the configuration shown in fig. 9 or fig. 10. Fig. 11-13 show the prior art installation process and the ring-pressed state for visual comparison.

The following table four shows the configuration of the ring crush parameters after ring crush with the most common key nominal size DN of 15 to 100 in the current market by using the ring crush method in this embodiment:

table four: for improving the dimensional parameters of ring-pressed pipe

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (5)

1. The utility model provides a dysmorphism sealing washer which characterized in that: comprises an integrally formed rubber sealing element (2) and at least one convex ring (3) arranged on the inner wall of the rubber sealing element (2); the radial height h of the convex ring (3) is 1.4-4.9mm, and the axial width l of the convex ring (3) is 2.5-9 mm.

2. A profiled sealing ring according to claim 1, characterized in that: the section of the convex ring (3) is semicircular or trapezoidal.

3. An improved annular pressure pipe fitting, comprising a pipe (4) and a pipe fitting (6) which are inserted into each other in a nested manner, characterized in that: the special-shaped sealing ring as claimed in any one of claims 1-2 is arranged between the pipe (4) and the pipe fitting (6).

4. An improved swage fitting according to claim 3, wherein: the end of the pipe fitting (6) comprises an embedded section (8) which is used for socket joint matching and inserting the pipe (4), the embedded section (8) continues to expand outwards to extend to form an expansion section (7) with a diameter larger than that of the embedded section (8), and the space between the inner wall of the expansion section (7) and the pipe (4) can be provided with the special-shaped sealing ring (1).

5. An improved swage fitting according to claim 4, wherein: the pipe (4) is provided with a concave ring (5) which is formed by ring pressing and used for accommodating a convex ring (3) arranged on the special-shaped sealing ring (1).

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