A sealing structure for mechanical tee

Abstract

The present invention discloses a sealing structure for a mechanical tee, belonging to the field of oil and gas pipelines. The sealing structure comprises: at least one pair of convex sealing groups, at least one pair of concave sealing groups and at least one pair of axial seals; the number of the convex seals is the same as that of the concave seals, and the at least one pair of convex sealing groups, the at least one pair of concave sealing groups and the at least one pair of axial seals correspond to each other one by one; when in use, a pair of convex sealing groups and a pair of concave sealing groups form a pair of annular sealing groups, which are respectively distributed radially symmetrically on both sides of the interior of the mechanical tee, and the two ends of a pair of axial seals are sealed and connected to the outer side of the joint of the pair of annular sealing groups, and the pair of axial seals are axially symmetrical and parallel to each other. The present invention avoids leakage between the inner surface of the mechanical tee and the outer surface of the oil and gas pipeline by effectively sealing at least one three-dimensional space composed of at least one pair of convex sealing groups, at least one pair of concave sealing groups and at least one pair of axial seals.

Description

Technical Field

[0001] The invention relates to the field of oil and gas pipelines, and in particular to a sealing structure for a mechanical tee. Background Art

[0002] Oil and gas pipelines are known as the lifeline of oil and gas fields. In the process of oil and gas transportation, the safe and reliable operation of oil and gas pipelines is the fundamental guarantee of oil and gas production. Due to the complexity of the natural environment in which oil and gas pipelines are located, the trace elements contained in oil and gas products, and the conditions of the pipelines themselves, the damage of oil and gas pipelines is always inevitable. After the oil and gas pipelines are damaged, emergency repair equipment can be used for emergency repair. In the process of emergency repair construction, mechanical tees are very important equipment.

[0003] In the maintenance and repair of oil and gas pipelines, especially in the maintenance and repair of oil and gas pipelines under non-welding conditions, only mechanical tees can be selected as necessary repair tools. Since the mechanical tee includes an upper shell and a lower shell, which are installed at the opening of the oil and gas pipeline in an embracing manner, when installing the mechanical tee, bolts, nuts and anti-loosening washers can be used to fix the upper shell and the lower shell. However, since the mechanical tee and the oil and gas pipeline are both rigid bodies, leakage problems will inevitably occur between the inner surface of the mechanical tee and the outer surface of the oil and gas pipeline. Summary of the invention

[0004] In order to solve the problems of the related art, an embodiment of the present invention provides a sealing structure for a mechanical tee. The technical solution is as follows:

[0005] The present application provides a sealing structure for a mechanical tee, the sealing structure comprising: at least one pair of convex sealing groups, the convex sealing group comprising at least one convex sealing member; at least one pair of concave sealing groups, the concave sealing group comprising at least one concave sealing member; and at least one pair of axial sealing members;

[0006] The number of the convex seals is the same as that of the concave seals, and the at least one pair of convex seal groups, the at least one pair of concave seal groups and the at least one pair of axial seals correspond to each other one by one;

[0007] When in use, a pair of convex sealing groups and a pair of concave sealing groups form a pair of annular sealing groups, both ends of a pair of axial seals are sealed to the outer sides of the joints of the pair of annular sealing groups, and the pair of axial seals are axially symmetrical and parallel to each other.

[0008] Optionally, the convex seal refers to a seal with convex grooves at both ends, or refers to a seal with convex shapes at both ends composed of at least two bevel seals, and the bevel seal refers to a seal with a preset angle between the end face and the cross section in the stretched state;

[0009] The concave seal refers to a seal with grooves at both ends, or refers to a seal composed of at least two bevel seals with concave shapes at both ends.

[0010] Optionally, the axial seal comprises an axial seal with a rectangular cross-section and an axial seal with a semicircular cross-section;

[0011] The two ends of the rectangular cross-section axial seal are connected to the outer side of one end of a pair of convex seal groups, and the rectangular cross-section axial seal is located on the same side of the pair of convex seal groups, and the two ends of the semicircular cross-section axial seal are connected to the outer side of one end of a pair of concave seal groups, and the semicircular cross-section axial seal is located on the same side of the pair of concave seals; or,

[0012] The two ends of the rectangular cross-section axial seal are connected to the outer side of one end of a pair of concave seal groups, and the rectangular cross-section axial seal is located on the same side of the pair of concave seal groups. The two ends of the semicircular cross-section axial seal are connected to the outer side of one end of a pair of convex seal groups, and the semicircular cross-section axial seal is located on the same side of the pair of convex seals.

[0013] Optionally, both ends of the axial seal are S-shaped.

[0014] Optionally, the convex sealing group and the concave sealing group are both semicircular in shape.

[0015] Optionally, the convex sealing group further includes at least one flat-angle seal, and the concave sealing group further includes at least one flat-angle seal, wherein the flat-angle seal refers to a seal whose end face and cross section are parallel to each other in a stretched state.

[0016] Optionally, for the convex sealing group, the sealing structure further includes two steel rings with L-shaped cross-sections, and the two steel rings with L-shaped cross-sections are respectively located on both sides of the convex sealing group to tightly adhere to and wrap the convex sealing group.

[0017] Optionally, for the concave sealing group, the sealing structure further includes two steel rings with L-shaped cross-sections, and the two steel rings with L-shaped cross-sections are respectively located on both sides of the concave sealing group to tightly adhere to and wrap the concave sealing group.

[0018] The technical solution provided by the embodiment of the present invention has the following beneficial effects: in the embodiment of the present invention, when in use, the convex sealing group and the concave sealing group form an annular sealing group. Since the convex sealing group includes a convex sealing member and the concave sealing member includes a concave sealing member, the contact area at the joint of the formed annular sealing group is increased, thereby forming an effective annular seal. Furthermore, the two ends of the axial seal are connected by sealing with the outside of the joint of the annular seal group. During the installation process of the mechanical tee, the annular seal group and the axial seal are squeezed, which effectively solves the problem of leakage at the axial seal and annular seal joint of the mechanical tee. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of a sealing structure for a mechanical tee provided in an embodiment of the present invention;

[0021] Figure 2 (a) is a top view of a sealing structure for a mechanical tee provided in an embodiment of the present invention;

[0022] Figure 2 (b) is a cross-sectional view of a sealing structure for a mechanical tee provided in an embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of an axial seal provided by an embodiment of the present invention;

[0024] Figure 4 is a schematic structural diagram of another axial seal provided by an embodiment of the present invention;

[0025] Figure 5 It is a structural schematic diagram of a convex sealing group and a concave sealing group provided by an embodiment of the present invention;

[0026] Figure 6 is a schematic structural diagram of an angled seal provided by an embodiment of the present invention;

[0027] Figure 7 is a structural schematic diagram of a flat angle seal provided by an embodiment of the present invention;

[0028] Figure 8 It is a structural schematic diagram of an L-shaped steel ring provided in an embodiment of the present invention.

[0029] Reference numerals:

[0030] 1: convex seal group; 11: convex seal; 12: flat angle seal;

[0031] 2: concave seal group; 21: concave seal; 22: flat angle seal;

[0032] 3: Axial seal; 4: L-shaped steel ring.

[0033] AA: axial cross-sectional view of the sealing structure; GG: cross-sectional view of the axial seal; h1: height of the S-bend; h2: height of the S-bend; α: angle of the S-bend; β: angle of the S-bend. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] Figure 1 Schematic diagram of a sealing structure for a mechanical tee provided by an embodiment of the present invention. Figure 1 , the sealing structure comprises:

[0036] at least one pair of convex sealing groups 1, the convex sealing group 1 comprising at least one convex sealing member 11;

[0037] at least one pair of female seal groups 2, the female seal groups 2 comprising at least one female seal 21; and,

[0038] at least one pair of axial seals 3;

[0039] The number of convex seals 11 and concave seals 21 is the same, and at least one pair of convex seal groups 1, at least one pair of concave seal groups 2 and at least one pair of axial seals 3 correspond one to one;

[0040] When in use, a pair of convex sealing groups 1 and a pair of concave sealing groups 2 form a pair of annular sealing groups, and both ends of a pair of axial seals 3 are sealedly connected to the outer sides of the joints of the pair of annular sealing groups. The pair of axial seals 3 are axially symmetrical and parallel to each other.

[0041] In the embodiment of the present invention, the convex sealing group 1 and the concave sealing group 2 can form an annular sealing group. Since the convex sealing group 1 includes a convex sealing member 11 and the concave sealing member 2 includes a concave sealing member 21, the contact area at the joint of the formed annular sealing group is increased, thereby forming an effective annular seal. In addition, the two ends of the axial seal 3 are connected to the outer side of the joint of the annular seal group through sealing, thereby forming an effective axial seal. During the installation process of the mechanical tee, the convex sealing group 1, the concave sealing group 2 and the axial seal 3 are squeezed, and the leakage problem at the axial seal and annular seal joint of the mechanical tee is effectively solved.

[0042] The connection method between the annular seal group formed by the convex seal group 1 and the concave seal group 2 and the axial seal is as follows: Figure 2 (a) and Figure 2 (b) shows a top view and an AA cross-sectional view of the sealing structure.

[0043] Furthermore, in the use state, since a pair of convex sealing groups 1 and a pair of concave sealing groups 2 can form a pair of annular sealing groups, and a pair of axial sealing members 3 and a pair of annular sealing groups can form an effective seal in a three-dimensional space, at least one pair of convex sealing groups 1, at least one pair of concave sealing groups 2 and at least one pair of axial sealing members 3 can correspond to each other one by one. That is, the number of at least one pair of convex sealing groups 1, at least one pair of concave sealing groups 2 and at least one pair of axial sealing members is the same.

[0044] To facilitate the installation of the mechanical tee, the mechanical tee may include an upper shell and a lower shell. Before installation, a pair of convex sealing groups 1 may be fixed to the upper shell in advance, and the concave sealing group 2 may be fixed to the lower shell; or the convex sealing group 1 may be fixed to the lower shell in advance, and the concave sealing group 2 may be fixed to the upper shell in advance.

[0045] Furthermore, during the installation process, the operator can place a pair of axial seals at the joints on both sides of the upper shell and the lower shell, and make close contact with the joints of the annular seal group formed by the convex seal group 1 and the concave seal group 2, and by fastening the upper shell and the lower shell to squeeze the convex seal group 1, the concave seal group 2 and the axial seal 3, the contact area between the convex seal group 1 and the concave seal group 2 is increased, and the leakage problem at the axial seal and annular seal joints of the mechanical tee is effectively solved.

[0046] In order to better achieve effective sealing at the corners of the upper shell and the lower shell of the mechanical tee, both ends of the axial seal 3 may be S-shaped.

[0047] The angle and height of the S-shaped bend between each pair of axial seals 3 may be different, for example, Figure 3 As shown, when the sealing structure includes two pairs of axial seals 3, the bend angle α formed by the two pairs of axial seals 3 may be not less than 30 degrees and not more than 45 degrees, and the bend angle β may be not less than 35 degrees and not more than 45 degrees. The height h1 of the S-bend of the two pairs of axial seals 3 is less than h2, and the height of the S-bend is determined according to the outer diameter and wall thickness of the mechanical tee.

[0048] Of course, if Figure 4 As shown, both ends of the axial seal 3 may also be L-shaped to increase the contact area between the axial seal and the annular seal, wherein the height of the L-shape is determined based on the outer diameter and wall thickness of the mechanical tee.

[0049] In addition, in order to achieve effective sealing at the interface between the upper shell and the lower shell of the mechanical tee, Figure 3 As shown, the cross section GG of the axial seal 3 can be half rectangular and half semicircular.

[0050] Further, in order to save the installation time of the mechanical tee, the axial seal 3 may include an axial seal with a rectangular cross-section and an axial seal with a semicircular cross-section, so that before the mechanical tee is installed, the two ends of the axial seal with a rectangular cross-section are pre-connected to the outer side of one end of a pair of convex seal groups, and the axial seal with a rectangular cross-section is located on the same side of the pair of convex seal groups, and the two ends of the axial seal with a semicircular cross-section are connected to the outer side of one end of a pair of concave seal groups, and the axial seal with a semicircular cross-section is located on the same side of the pair of concave seals; or,

[0051] The two ends of the axial seal with a rectangular cross-section are connected to the outer side of one end of a pair of concave seal groups, and the axial seal with a rectangular cross-section is located on the same side of the pair of concave seal groups. The two ends of the axial seal with a semicircular cross-section are connected to the outer side of one end of a pair of convex seal groups, and the axial seal with a semicircular cross-section is located on the same side of the pair of convex seals.

[0052] After introducing the axial seal 3 of the sealing structure, the convex sealing group 1 and the concave sealing group 2 of the sealing structure are introduced in detail.

[0053] A pair of convex sealing groups 1 includes two convex sealing groups 1, and a pair of concave sealing groups 2 includes two concave sealing groups 2. When a pair of convex sealing groups 1, a pair of concave sealing groups 2 and a pair of axial sealing members 3 are used together, an effective seal of a three-dimensional space can be formed. Therefore, when the sealing structure includes at least two pairs of convex sealing groups 1, two pairs of concave sealing groups 2 and two pairs of axial sealing groups 3, the sealing structure can form at least two effective seals of three-dimensional spaces, thereby ensuring the sealing performance of the mechanical tee.

[0054] The convex sealing group 1 and the concave sealing group 2 can be placed in the upper and lower shells of the mechanical tee, and the upper and lower shells are installed on the outer surface of the pipeline in an embracing manner. Therefore, the convex sealing group 1 and the concave sealing group 2 can both be semicircular.

[0055] Furthermore, the convex seal 11 included in the convex seal group 1 may refer to a seal with convex grooves at both ends, or may refer to a seal with convex ends composed of at least two bevel seals; the concave seal 21 included in the concave seal group 2 may refer to a seal with grooves at both ends, or may refer to a seal with concave ends composed of at least two bevel seals.

[0056] When the convex seal 11 is a seal with convex grooves at both ends, the concave seal 21 is a seal with concave grooves at both ends, and the convex angle of the convex groove of the convex seal 11 is the same as the concave angle of the concave groove of the concave seal 21. When the convex seal 11 with a convex groove at the end face and the concave seal 21 with a concave groove at the end face are used together, the end faces of the convex seal group 1 and the concave seal group 2 are in close contact, and the contact area is increased.

[0057] like Figure 5 As shown, when the male seal 11 is composed of at least two bevel seals and the female seal 21 is composed of at least two bevel seals, the number of bevel seals of the male seal 11 can be the same as the number of bevel seals of the female seal 21.

[0058] Among them, Figure 6 As shown, an angled seal refers to a seal in which the angle between the end face and the cross section is a preset angle when in a stretched state, and the angled seal can be an angled seal that is bent as a whole into a semicircular structure and has a rectangular cross section. The preset angle ranges from 30 degrees to 60 degrees, for example, the preset angle can be 30 degrees, 45 degrees or 60 degrees, etc. When the sharp corners of the two angled seals are opposite, a convex sealing group 1 is formed, and vice versa, a concave sealing group 2 is formed.

[0059] Furthermore, if Figure 5 As shown, the convex seal group 1 further includes at least one flat angle seal 12 , and the concave seal group 2 further includes at least one flat angle seal 22 .

[0060] At least one flat angle seal 12 is bonded to at least one convex seal 11, and at least one flat angle seal 22 is bonded to at least one concave seal 21. When the flat angle seal, the convex seal and the concave seal are used in combination, the sealing effect at the joint between the convex seal group 1 and the concave seal group 2 is effectively increased based on the cross-combination of the end faces of the flat angle seal, the convex seal and the concave seal.

[0061] Among them, the flat angle seal is a seal whose end face and cross section are parallel to each other. Figure 7 As shown, the flat-angle seal may be a flat-angle seal that is bent as a whole into a semicircular structure and has a rectangular cross section.

[0062] Furthermore, in order to prevent the edges and corners of the rectangular cross-sections of the convex seal 11, the concave seal 21 and the flat seal from causing harm to operators, the edges and corners of the rectangular cross-sections are chamfered.

[0063] Because the at least one convex seal 11 included in the convex seal group 1, or between the at least one convex seal 11 and the at least one flat angle seal 12, and the at least one concave seal 21 included in the concave seal group 2, or between the at least one concave seal 21 and the at least one flat angle seal 22, can be fixedly connected by bonding.

[0064] However, after the mechanical tee is installed, the convex sealing group 1 and the concave sealing group 2 are both in an extruded state. After disassembly, the convex seal 11 and the flat angle seal 12 included in the convex sealing group 1, or the concave seal 11 and the flat angle seal 12 included in the concave sealing group 2 may experience stress relaxation and creep failure.

[0065] Therefore, for the convex sealing group 1, the sealing structure can also include two steel rings 4 with L-shaped cross-sections, and the two steel rings 4 with L-shaped cross-sections are respectively located on both sides of the convex sealing group 1 to tightly fit and wrap the convex sealing group 1; for the concave sealing group 2, the sealing structure also includes two steel rings 4 with L-shaped cross-sections, and the two steel rings 4 with L-shaped cross-sections are respectively located on both sides of the concave sealing group 2 to tightly fit and wrap the concave sealing group 2.

[0066] like Figure 8 As shown, the L-shaped steel ring 4 refers to a steel ring that is bent into a semicircular structure as a whole and has an L-shaped cross section, wherein the corners of the L-shaped steel ring 4 are chamfered.

[0067] When the sealing structure is in use, the upper shell, the lower shell, the outer surface of the pipeline, at least one pair of convex sealing groups, at least one pair of concave sealing groups and at least one pair of axial seals of the mechanical tee can form at least one effective three-dimensional seal.

[0068] When at least two three-dimensional spaces are effectively sealed in use, the mechanical tee may further include a pressure test hole, so as to test the sealing effect of the sealing structure through the pressure test hole.

[0069] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing structure for a mechanical tee, the mechanical tee comprising an upper shell and a lower shell, characterized in that: The sealing structure comprises: Two pairs of convex seal groups, the convex seal groups include a convex seal and two flat-angle seals, the convex seal and the two flat-angle seals are arranged side by side along the axial direction of the convex seal group, and the convex seal refers to a seal composed of two bevel seals with convex ends; Two pairs of concave seal groups, the concave seal groups comprising a concave seal and two flat-angle seals, the concave seal and the two flat-angle seals being arranged side by side along the axial direction of the concave seal group, the concave seal being a seal composed of two bevel seals with concave ends; and, Two pairs of axial seals, both ends of the axial seals are S-shaped, the bending angle (α) formed by one pair of the axial seals is not less than 30 degrees and not more than 45 degrees, the bending angle (β) formed by the other pair of the axial seals is not less than 35 degrees and not more than 45 degrees, the height of the S-bend of one pair of the axial seals is h1, and the height of the S-bend of the other pair of the axial seals is h2, the height h1 is less than the height h2, so that the two pairs of axial seals have a gap in the radial direction, and the axial seals are located at the joints on both sides of the upper shell and the lower shell; The axial seal includes an axial seal with a rectangular cross section and an axial seal with a semicircular cross section; The two ends of the rectangular cross-section axial seal are connected to the outer side of one end of a pair of convex seal groups, and the rectangular cross-section axial seal is located on the same side of the pair of convex seal groups, and the two ends of the semicircular cross-section axial seal are connected to the outer side of one end of a pair of concave seal groups, and the semicircular cross-section axial seal is located on the same side of the pair of concave seals; or, The two ends of the axial seal with a rectangular cross section are connected to the outer side of one end of a pair of concave seal groups, and the axial seal with a rectangular cross section is located on the same side of the pair of concave seal groups, and the two ends of the axial seal with a semicircular cross section are connected to the outer side of one end of a pair of convex seal groups, and the axial seal with a semicircular cross section is located on the same side of the pair of convex seals; The number of the convex seals is the same as that of the concave seals, the two pairs of convex seal groups, the two pairs of concave seal groups and the two pairs of axial seals correspond to each other one by one, the adjacent bevel seals, the adjacent convex seals and the flat-angle seals, and the adjacent concave seals and the flat-angle seals are fixedly connected by bonding, the cross-sectional shape of the bevel seals and the flat-angle seals is a rectangle, the corners of the rectangle have chamfers, the bevel seals refer to seals whose angle between the end face and the cross section is a preset angle in the stretched state, and the preset angle is 30 degrees to 60 degrees, the flat-angle seals refer to seals whose end face and the cross section are parallel to each other in the stretched state, and the convex seal group and the concave seal group are both semicircular; In the use state, the convex sealing group is fixed to the upper shell, and the concave sealing group is fixed to the lower shell; or, the convex sealing group is fixed to the lower shell, and the concave sealing group is fixed to the upper shell, a pair of convex sealing groups and a pair of concave sealing groups form a pair of annular sealing groups, two ends of a pair of axial seals are sealed and connected to the outer sides of the joints of the pair of annular sealing groups, and the pair of axial seals are axially symmetrical and parallel to each other; For the convex sealing group, the sealing structure further includes two steel rings with L-shaped cross sections, and the two steel rings with L-shaped cross sections are respectively located on both sides of the convex sealing group to closely adhere to and wrap the convex sealing group; For the concave sealing group, the sealing structure further includes two steel rings with L-shaped cross sections, and the two steel rings with L-shaped cross sections are respectively located on both sides of the concave sealing group to closely adhere to and wrap the concave sealing group; The steel ring is bent as a whole into a semicircular structure, the cross section of the steel ring is L-shaped, and the corners of the steel ring are chamfered.

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