Corrosion-resistant sealing surface compression ring of small-caliber flange transmitter and manufacturing method of corrosion-resistant sealing surface compression ring

Abstract

The invention discloses a corrosion-resistant sealing surface compression ring of a small-caliber flange transmitter and a manufacturing method of the corrosion-resistant sealing surface compression ring. The corrosion-resistant sealing surface compression ring comprises a supporting ring and a corrosion-resistant sealing wrapping layer. The two axial end faces of the supporting ring are the first end face and the second end face respectively, the inner side wall of the supporting ring is covered with a corrosion-resistant sealing wrapping layer, and the corrosion-resistant sealing wrapping layer extends along the first end face and the second end face. The corrosion-resistant sealing surface compression ring takes the supporting ring as a main body, and the working surface of the supporting ring is coated with the corrosion-resistant sealing coating layer, so that the corrosion-resistant sealing surface compression ring has high corrosion resistance and high strength, does not age or crack after being used for a long time, and is long in service life; and the coating can be used in high-temperature, high-pressure and corrosive environments, and is wide in applicability.

Description

Technical Field

[0001] The invention belongs to the technical field of flange transmitters, and in particular relates to a corrosion-resistant sealing surface pressure ring of a small-caliber flange transmitter and a manufacturing method thereof. Background Art

[0002] In the application of low-range and small-diameter flange transmitters in process industry such as chemical industry, due to the small size of flange sealing surface, the corresponding pressure sensing measuring surface is also small, resulting in low pressure measurement accuracy. In practical applications, in order to improve the measurement accuracy, the effective area of ​​the measuring diaphragm is sometimes increased, and a variable diameter sealing surface pressure ring matching this area is added on it. Among them, the variable diameter sealing surface pressure ring usually adopts a simple metal sealing surface pressure ring + sealing ring or a full plastic structure. However, these variable diameter sealing surface pressure rings have poor performance and are prone to aging and cracking after long-term use, resulting in sealing failure. Summary of the invention

[0003] In view of the above problems, the object of the present invention is to provide a corrosion-resistant sealing surface pressure ring of a small-diameter flange transmitter and a manufacturing method thereof.

[0004] The technical solution of the present invention is: A corrosion-resistant sealing surface pressure ring for a small-diameter flange transmitter comprises a support ring and a corrosion-resistant sealing wrapping layer; the two axial end faces of the support ring are respectively a first end face and a second end face, the inner side wall of the support ring is covered with the corrosion-resistant sealing wrapping layer, and the corrosion-resistant sealing wrapping layer extends along the first end face and the second end face.

[0005] In the corrosion-resistant sealing surface pressure ring of a small-diameter flange transmitter provided in a preferred embodiment, the first end face is the end face on the support ring facing the measuring instrument side, and the second end face is the end face on the support ring facing the on-site installation side; the inner diameter of the first end face is smaller than the inner diameter of the second end face.

[0006] In a corrosion-resistant sealing surface pressure ring of a small-diameter flange transmitter provided in a preferred embodiment, the inner side wall of the support ring has a variable diameter section and a constant diameter section along the axial direction, the axial first end of the variable diameter section is connected to the first end face, the axial second end of the variable diameter section is connected to the axial first end of the constant diameter section, and the axial second end of the constant diameter section is connected to the second end face; The inner diameter of the variable diameter section increases from the first axial end to the second axial end thereof, and the inner diameters of the equal diameter sections are equal.

[0007] In the corrosion-resistant sealing surface pressure ring of a small-diameter flange transmitter provided in a preferred embodiment, the axial first end of the variable diameter section and the first end face, the axial second end of the variable diameter section and the axial first end of the equal diameter section, and the axial second end of the equal diameter section and the second end face are all connected by an annular arc surface transition.

[0008] In the corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter provided in a preferred embodiment, both the first end surface and the second end surface are provided with shaping protrusions.

[0009] In the corrosion-resistant sealing surface pressure ring of a small-diameter flange transmitter provided in a preferred embodiment, the shaping protrusion is an annular structure arranged around the axis of the support ring.

[0010] In a corrosion-resistant sealing surface pressure ring of a small-diameter flange transmitter provided in a preferred embodiment, a first shaping surface facing radially inwardly of the support ring is connected to the radial outer side of the first end face, and the first shaping surface protrudes from the first end face, and the first shaping surface is inclined toward the radial inner side of the support ring along the direction protruding from the first end face; A second shaping surface facing radially inwardly of the support ring is connected to the radial outer side of the second end surface, and the second shaping surface protrudes from the second end surface and is inclined toward the radial inner side of the support ring along the direction protruding from the second end surface.

[0011] In the corrosion-resistant sealing surface pressure ring of a small-caliber flange transmitter provided in a preferred embodiment, the support ring is a metal ring, and the corrosion-resistant sealing wrapping layer is a polytetrafluoroethylene layer.

[0012] A method for manufacturing a corrosion-resistant sealing surface pressure ring, used for manufacturing a corrosion-resistant sealing surface pressure ring of a small-diameter flange transmitter as described in any one of the above, comprising: Step 1: manufacturing the support ring and the corrosion-resistant sealing wrapping ring, wherein the corrosion-resistant sealing wrapping ring comprises a cylindrical ring and a planar ring, wherein the inner side of the planar ring is connected to the axial first end of the cylindrical ring to form a whole; Step 2: insert the cylindrical ring into the support ring, and make the plane ring fit with the second end surface of the support ring, and then put the combination of the corrosion-resistant sealing wrapping ring and the support ring into a pressure molding mold; Step three: using the pressurized molding die to heat and pressurize the assembly to form it into the corrosion-resistant sealing surface pressure ring, wherein the corrosion-resistant sealing wrap ring is pressurized into the corrosion-resistant sealing wrap layer.

[0013] In the manufacturing method of a corrosion-resistant sealing surface pressure ring provided in a preferred embodiment, the pressurization of the assembly by the pressurization molding mold in the step three includes two pressurization molding processes, wherein the first pressurization molding process expands the end of the cylindrical ring that is not connected to the planar ring into a bell-mouth shape, and the second pressurization molding process pressurizes the assembly into the corrosion-resistant sealing surface pressure ring.

[0014] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: In the present invention, the corrosion-resistant sealing surface pressure ring is based on the support ring, and the working surface of the support ring is covered with a corrosion-resistant sealing wrapping layer, so that the corrosion-resistant sealing surface pressure ring has both high corrosion resistance and high strength, can be used for a long time in a high-temperature corrosion environment, and is not prone to aging and cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0016] Figure 1 It is a cross-sectional schematic diagram of a corrosion-resistant sealing surface pressure ring of a small-caliber flange transmitter of the present invention; Figure 2 A schematic top view of a corrosion-resistant sealing surface pressure ring of a small-caliber flange transmitter of the present invention; Figure 3 It is a partial cross-sectional schematic diagram of a support ring of the present invention; Figure 4 It is a cross-sectional schematic diagram of a corrosion-resistant sealing wrap ring of the present invention; Figure 5 A schematic top view of a corrosion-resistant sealing wrap ring of the present invention; Figure 6 It is a cross-sectional schematic diagram of an assembly of a corrosion-resistant sealing wrap ring and a support ring of the present invention; Figure 7 It is a cross-sectional schematic diagram of a combination of a corrosion-resistant sealing wrap ring and a support ring of the present invention after being press-formed for the first time; Figure 8 It is a cross-sectional schematic diagram of a combination of a corrosion-resistant sealing wrap ring and a support ring of the present invention after being press-formed for the second time; Fig. 9 and Fig.10 The present invention is a schematic diagram of the installation of a corrosion-resistant sealing surface pressure ring of a small-caliber flange transmitter.

[0017] Description of reference numerals: 1: Support ring; 11: First end face; 12: Second end face; 13: Reduced diameter section; 14: Equal diameter section; 15: First shaping surface; 16: Second shaping surface; 17: Shaping protrusion; 2: Corrosion-resistant sealing wrapping layer; 20: Corrosion-resistant sealing wrapping ring; 21: Cylindrical ring; 22: Plane ring; 3: Transmitter flange; 4: Field installation flange; 5: Bolts; A: Measuring instrument side; B: Field installation side. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0019] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0020] See also Figures 1 to 10 The present embodiment provides a corrosion-resistant sealing surface pressure ring for a small-diameter flange transmitter, comprising a support ring 1 and a corrosion-resistant sealing wrapping layer 2; the two axial end faces of the support ring 1 are respectively a first end face 11 and a second end face 12, the inner side wall of the support ring 1 is covered with the corrosion-resistant sealing wrapping layer 2, and the corrosion-resistant sealing wrapping layer 2 extends along the first end face 11 and the second end face 12.

[0021] The existing variable diameter sealing surface pressure ring is prone to aging and cracking after long-term use mainly because: in the metal sealing surface pressure ring + sealing ring solution, the metal sealing surface pressure ring is easily corroded and causes aging and cracking; in the all-plastic structure solution, the all-plastic structure has poor strength and is prone to aging and cracking during long-term compression and sealing.

[0022] The corrosion-resistant sealing surface pressure ring in this embodiment is based on the support ring 1, and the corrosion-resistant sealing wrapping layer 2 is coated on the working surface of the support ring 1, so that the corrosion-resistant sealing surface pressure ring has both high corrosion resistance and high strength, will not age and crack after long-term use, and has a long service life; and can be used in high temperature, high pressure and corrosive environments, and has a wide range of applicability.

[0023] The corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter of this embodiment is further described below.

[0024] like Fig.10As shown, when the corrosion-resistant sealing surface pressure ring is used, it is pressed between the transmitter flange 3 and the field installation flange 4 of the small-diameter flange transmitter. Specifically, after the transmitter flange 3 and the field installation flange 4 are connected by bolts 5, the end faces of the two respectively press the corrosion-resistant sealing wrapping layer 2 on both sides of the axial direction of the corrosion-resistant sealing surface pressure ring (the specific pressed parts are the parts covering the first end face 11 and the second end face 12). Among them, the end face of the field installation flange 4 pressed by the corrosion-resistant sealing surface pressure ring is used as the boundary, and the side close to the field installation flange 4 is the field installation side B, and the other side, that is, the side close to the small-diameter flange transmitter, is the measuring instrument side A.

[0025] In the corrosion-resistant sealing surface of this embodiment, the first end face 11 is the end face of the support ring 1 facing the measuring instrument side A, and the second end face 12 is the end face of the support ring 1 facing the field installation side B. The inner diameter of the first end face 11 is smaller than the inner diameter of the second end face 12.

[0026] The inner side wall of the support ring 1 has a reduced diameter section 13 and a constant diameter section 14 along the axial direction, the axial first end of the reduced diameter section 13 is connected to the first end face 11, the axial second end of the reduced diameter section 13 is connected to the axial first end of the constant diameter section 14, and the axial second end of the constant diameter section 14 is connected to the second end face 12. The inner diameter of the reduced diameter section 13 increases from its axial first end to its axial second end, and the inner diameters of the constant diameter sections 14 are equal.

[0027] Preferably, the axial first end of the reducing section 13 and the first end face 11, the axial second end of the reducing section 13 and the axial first end of the equal diameter section 14, and the axial second end of the equal diameter section 14 and the second end face 12 are all connected by annular arc surface transition.

[0028] The first end surface 11 and the second end surface 12 are provided with shaping protrusions 17. Specifically, the shaping protrusion 17 is an annular structure arranged around the axis of the support ring 1, and its cross section is triangular; one shaping protrusion 17 is provided on the first end surface 11, and two shaping protrusions 17 are provided on the second end surface 12.

[0029] Furthermore, a first molding surface 15 facing radially inwardly of the support ring 1 is connected to the radial outer side of the first end face 11, and the first molding surface 15 protrudes from the first end face 11, and the first molding surface 15 is inclined toward the radial inner side of the support ring 1 along the direction protruding from the first end face 11; a second molding surface 16 facing radially inwardly of the support ring 1 is connected to the radial outer side of the second end face 12, and the second molding surface 16 protrudes from the second end face 12, and the second molding surface 16 is inclined toward the radial inner side of the support ring 1 along the direction protruding from the second end face 12.

[0030] The design of the shaping protrusion 17, the first shaping surface 15, and the second shaping surface 16 is conducive to maintaining the shape of the corrosion-resistant sealing package layer 2. The triangular tip shown in the shaping protrusion 17 is embedded in the corrosion-resistant sealing package layer 2 during molding to prevent the radial displacement and deformation of the corrosion-resistant sealing package layer 2. The first shaping surface 15 and the second shaping surface 16 are set as axial inverted cone stops (i.e., inclined in the radial direction of the support ring 1), which can prevent the corrosion-resistant sealing package layer 2 from being disengaged in the axial direction after shaping, so that it is not easy to deform during use.

[0031] The corrosion-resistant sealing surface pressure ring of the present embodiment needs to have a certain high strength, and the support ring 1 is preferably a metal ring, such as one made of stainless steel. The corrosion-resistant sealing wrapping layer 2 needs to have high corrosion resistance and a certain elasticity to achieve the sealing function, and is preferably made of corrosion-resistant plastic with a certain elasticity, such as a polytetrafluoroethylene layer made of polytetrafluoroethylene material.

[0032] A method for manufacturing a corrosion-resistant sealing surface pressure ring for a small-diameter flange transmitter is provided below. It should be noted that this manufacturing method is only a feasible solution for manufacturing the corrosion-resistant sealing surface pressure ring of this embodiment, and is not a limitation on the corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter of the present invention.

[0033] The manufacturing method of the corrosion-resistant sealing surface pressure ring includes: Step 1: manufacturing a support ring 1 and a corrosion-resistant sealing wrapping ring 20, wherein the corrosion-resistant sealing wrapping ring 20 comprises a cylindrical ring 21 and a plane ring 22, wherein the inner side of the plane ring 22 is connected to the axial first end of the cylindrical ring 21 to form a whole; Step 2: insert the cylindrical ring 21 into the support ring 1, and make the plane ring 22 fit the second end surface 12 of the support ring 1, and then put the assembly of the corrosion-resistant sealing wrap ring 20 and the support ring 1 into a pressure molding mold; Step three: Use a pressure molding die to heat and pressurize the assembly to form it into a corrosion-resistant sealing surface pressure ring, wherein the corrosion-resistant sealing wrap ring 20 is pressurized into a corrosion-resistant sealing wrap layer 2.

[0034] Preferably, the pressurization of the assembly by the pressurization molding mold in step three includes two pressurization molding processes, wherein the first pressurization molding process expands the end of the cylindrical ring 21 that is not connected to the plane ring 22 into a bell-mouth shape, and the second pressurization molding process pressurizes the assembly into a corrosion-resistant sealing surface pressure ring.

[0035] The corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter of the present embodiment is based on the support ring 1, and its working surface is covered with a corrosion-resistant sealing wrap layer 2 of a certain thickness. The corrosion-resistant sealing wrap layer 2 is fitted with the working surface of the support ring 1, and the cross-sectional shape of the corrosion-resistant sealing wrap layer 2 is U-shaped to enhance the corrosion resistance of the corrosion-resistant sealing surface pressure ring. At the same time, it is preferred that the support ring 1 made of metal material is used as the main body to enhance the strength of the corrosion-resistant sealing surface pressure ring, so that the corrosion-resistant sealing surface pressure ring can be used not only in low-pressure occasions, but also in high-pressure occasions, and even in high-temperature and high-pressure occasions, with a wide range of applications and good performance. The corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter of the present embodiment has the advantages of high corrosion resistance, high temperature resistance, high strength, long service life, etc., and has broad application prospects.

[0036] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A corrosion-resistant sealing surface pressure ring for a small-caliber flange transmitter, characterized in that: It includes a support ring and a corrosion-resistant sealing wrapping layer; the two axial end faces of the support ring are respectively a first end face and a second end face, the inner side wall of the support ring is covered with the corrosion-resistant sealing wrapping layer, and the corrosion-resistant sealing wrapping layer extends along the first end face and the second end face.

2. The corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter according to claim 1 is characterized in that: The first end face is the end face of the support ring facing the measuring instrument, and the second end face is the end face of the support ring facing the on-site installation side; the inner diameter of the first end face is smaller than the inner diameter of the second end face.

3. The corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter according to claim 2 is characterized in that: The inner side wall of the support ring has a variable diameter section and a constant diameter section along the axial direction, the axial first end of the variable diameter section is connected to the first end surface, the axial second end of the variable diameter section is connected to the axial first end of the constant diameter section, and the axial second end of the constant diameter section is connected to the second end surface; The inner diameter of the variable diameter section increases from the first axial end to the second axial end thereof, and the inner diameters of the equal diameter sections are equal.

4. The corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter according to claim 3 is characterized in that: The axial first end of the variable diameter section and the first end face, the axial second end of the variable diameter section and the axial first end of the constant diameter section, and the axial second end of the constant diameter section and the second end face are all connected through an annular arc surface transition.

5. The corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter according to claim 1 is characterized in that: The first end surface and the second end surface are both provided with shaping protrusions.

6. The corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter according to claim 5 is characterized in that: The shaping protrusion is an annular structure arranged around the axis of the supporting ring.

7. The corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter according to claim 5 is characterized in that: The radial outer side of the first end surface is connected to a first shaping surface facing the radial inner side of the support ring, and the first shaping surface protrudes from the first end surface, and the first shaping surface is inclined toward the radial inner side of the support ring along the direction protruding from the first end surface; A second shaping surface facing radially inwardly of the support ring is connected to the radial outer side of the second end surface, and the second shaping surface protrudes from the second end surface and is inclined toward the radial inner side of the support ring along the direction protruding from the second end surface.

8. The corrosion-resistant sealing surface pressure ring of the small-diameter flange transmitter according to claim 1 is characterized in that: The support ring is a metal ring, and / or the corrosion-resistant sealing wrapping layer is a polytetrafluoroethylene layer.

9. A method for manufacturing a corrosion-resistant sealing surface pressure ring, characterized in that: A corrosion-resistant sealing surface pressure ring for manufacturing a small-diameter flange transmitter according to any one of claims 1 to 8, comprising: Step 1: manufacturing the support ring and the corrosion-resistant sealing wrapping ring, wherein the corrosion-resistant sealing wrapping ring comprises a cylindrical ring and a planar ring, wherein the inner side of the planar ring is connected to the axial first end of the cylindrical ring to form a whole; Step 2: insert the cylindrical ring into the support ring, and make the plane ring fit with the second end surface of the support ring, and then put the combination of the corrosion-resistant sealing wrapping ring and the support ring into a pressure molding mold; Step three: pressurizing the assembly using the pressurizing mold to pressurize it into the corrosion-resistant sealing surface pressure ring, wherein the corrosion-resistant sealing wrap ring is pressurized into the corrosion-resistant sealing wrap layer.

10. The method for manufacturing a corrosion-resistant sealing surface pressure ring according to claim 1, characterized in that: The pressurization of the assembly by the pressurization molding die in step three includes two pressurization molding processes, wherein the first pressurization molding process expands the end of the cylindrical ring that is not connected to the planar ring into a bell-mouth shape, and the second pressurization molding process pressurizes the assembly into the corrosion-resistant sealing surface pressure ring.

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