A high-pressure packing seal structure

Abstract

The invention discloses a high-pressure packing sealing structure, including an inner tube, an outer tube and a packing sealing structure, wherein the packing sealing structure includes a T-shaped sealing pressure ring sleeve, a wedge-shaped bevel packing structure, a flange flange joint and an internal compression block for limiting and fixing the wedge-shaped bevel packing structure, wherein the T-shaped sealing pressure ring sleeve has an integrally formed sleeve portion and a flange portion, wherein the sleeve portion is sleeved on the inner tube, and the wedge-shaped bevel packing structure and the flange flange joint are respectively compressed and connected to the sleeve portion and the flange portion in the radial direction and the axial direction, and form an axial sealing surface between the sleeve portion and the outer wall of the inner tube and a radial sealing surface between the flange portion and the flange flange joint. The present invention can evenly and widely hold the inner tube, is not likely to cause the inner tube to rupture, and achieves the effect of high-pressure sealing without fracturing the inner tube; and also has the function of being disassembled and cleaning internal blockages, which can solve the problem that the microchannel reactor in the chemical industry cannot withstand high pressure and is difficult to clear after being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of static packing seals, in particular to a high-pressure packing seal structure. Background Art

[0002] The inner and outer tubes of high-pressure pipelines can generally be sealed by welding or packing. For the high-pressure pipeline sealing of metal outer tubes and metal inner tubes, welding sealing can simply obtain sealing performance, but later maintenance is more difficult, for example, it is difficult to clear the pipeline after it is blocked; using packing sealing, general metal inner tubes are not corrosion-resistant and cannot be used for corrosive high-pressure pipelines; and for the high-pressure pipeline sealing of corrosion-resistant non-metallic inner tubes and metal outer shells (outer tubes), such as silicon carbide microchannel reactors and graphite heat exchangers in non-metallic heat exchangers, the non-metallic inner tubes and metal outer tubes cannot be welded and sealed. The inner and outer tubes of conventional high-pressure pipelines adopt an annular structure formed by a cylindrical cavity and the inner tube. The packing seal of the conventional annular structure is difficult to balance the force when clamping inward, which easily leads to the rupture of the inner tube, and the inner tube of conventional non-metallic heat exchangers cannot withstand high pressure. Summary of the Invention

[0003] In view of this, the object of the present invention is to provide a high-pressure packing sealing structure with a metal or non-metallic hard tube as an inner tube, which is automatically compensated, has a wedge-shaped packing clamped inwardly, and is detachable and maintainable.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a high-pressure packing sealing structure, comprising an inner tube, an outer tube and a packing sealing structure connecting the inner tube and the outer tube, the packing sealing structure comprising a T-shaped sealing pressure ring sleeve sleeved on the inner tube, a wedge-shaped inclined surface packing structure, a flange flanging joint and an internal compression stopper for limiting and fixing the wedge-shaped inclined surface packing structure, the T-shaped sealing pressure ring sleeve having an integrally formed sleeve portion and a flange portion, the sleeve portion being sleeved on the inner tube, the wedge-shaped inclined surface packing structure and the flange flanging joint being pressed and connected to the sleeve portion and flange portion of the T-shaped sealing pressure ring sleeve in the radial direction and the axial direction, respectively, and forming an axial sealing surface between the sleeve portion of the T-shaped sealing pressure ring sleeve and the outer wall of the inner tube and a radial sealing surface between the flange portion of the T-shaped sealing pressure ring sleeve and the flange flanging joint, respectively.

[0005] Preferably, the wedge-shaped inclined surface packing structure includes a conical packing cavity, a conical packing pressure ring sleeve and a diamond-shaped packing pressure ring sleeve. The diamond-shaped packing pressure ring sleeve, the conical packing pressure ring sleeve and the conical packing cavity are sequentially mounted on the sleeve portion of the T-shaped sealing pressure ring sleeve. Under the limitation of the internal tightening block, the axial thrust is converted into an inward-clamping radial sealing force through the cooperation of the conical packing cavity, the conical packing pressure ring sleeve and the diamond-shaped packing pressure ring sleeve, so that the wedge-shaped inclined surface packing structure is pressed and connected to the sleeve portion of the T-shaped sealing pressure ring sleeve.

[0006] Furthermore, the wedge-shaped inclined surface packing structure also includes an automatic compensation spring device, which is sleeved on the inner tube. One end of the automatic compensation spring device resists against the inner clamping block, and the other end resists against the wide surface of the conical packing pressure ring sleeve, continuously generating axial thrust on the conical packing pressure ring sleeve.

[0007] Furthermore, the inner wall of the diamond-shaped packing pressure ring sleeve is parallel to the outer wall of the inner tube and the sleeve portion of the T-shaped sealing pressure ring sleeve, so that they can slide relative to each other in the axial direction.

[0008] Furthermore, the diamond-shaped filler pressure ring sleeve has a first outer bevel and a second outer bevel, the first outer bevel fits with the inner wall bevel of the conical filler pressure ring sleeve, the second outer bevel fits with the inner wall bevel of the conical filler cavity, and the outer wall bevel of the conical filler pressure ring sleeve also fits with the inner wall bevel of the conical filler cavity.

[0009] Furthermore, flange surfaces are respectively formed at two axial ends of the conical filler cavity to be pressed and fixed with the flange parts of the inner pressing stopper and the T-shaped sealing pressure ring sleeve.

[0010] Preferably, the flange flanging joint and the wedge-shaped inclined surface filler structure, and the internal compression stop and the wedge-shaped inclined surface filler structure are fixed respectively by an external compression flange and a flange fastener.

[0011] Furthermore, a pair of external clamping flanges and a group of flange fasteners are respectively provided at the flange flanging joint and the wedge-shaped inclined surface packing structure and the internal clamping block and the wedge-shaped inclined surface packing structure. The pair of external clamping flanges are fixed by a group of flange fasteners, and the two pairs of external clamping flanges respectively connect and fix the flange flanging joint and the wedge-shaped inclined surface packing structure and the internal clamping block and the wedge-shaped inclined surface packing structure.

[0012] Furthermore, a pair of external compression flanges and two groups of flange fasteners are provided at the flange flanging joint and the wedge-shaped inclined surface packing structure and at the internal compression stop block and the wedge-shaped inclined surface packing structure. The pair of external compression flanges are fixed by the two groups of flange fasteners, and the flange flanging joint and the internal compression stop block are connected and fixed to the wedge-shaped inclined surface packing structure through a pair of external compression flanges.

[0013] Preferably, the wedge-shaped inclined surface filler structure is made of PTFE material.

[0014] The technical effects of the present invention are mainly reflected in the following aspects: the inner tube and the outer tube are connected and fixed to each other through a T-shaped sealing pressure ring sleeve, a wedge-shaped inclined surface filler structure, a flange flanging joint and an internal compression block, especially for the connection and fixation between the non-metallic inner tube and the metal outer tube, an axial seal and a radial seal are formed outside the inner tube, so that it can be applied to a shell-and-tube heat exchanger that needs to be resistant to high pressure and corrosion. For example, a shell-and-tube heat exchanger with a thin-walled silicon carbide inner tube that is resistant to high pressure and strong corrosion and a metal outer tube can be realized. By using the cooperation and compression of the T-shaped sealing pressure ring sleeve and the wedge-shaped inclined surface filler structure, the inner tube can be evenly and over a large area, which is not easy to cause the inner tube to rupture, thereby achieving the effect of high-pressure sealing without fracturing the inner tube; at the same time, the filler sealing structure also has the function of being disassembled and cleaning internal blockages, which can solve the problem that the microchannel reactor in the chemical industry cannot withstand high pressure and is difficult to clear after blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a partial structural diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the conical inclined surface packing of the present invention;

[0018] Figure 4 This is a structural diagram of Example 8 of the present invention. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0020] Example 1:

[0021] according to Figure 1-3 As shown, a high-pressure packing sealing structure includes a metal or non-metal inner tube 1, an outer tube (shell) and a packing sealing structure connecting the inner tube 1 and the outer tube (shell). Conventional cylindrical packing seals have difficulty in evenly distributing the inward tightening force, which can easily lead to the rupture of the inner tube 1. In addition, the non-metallic inner tube 1 and the metal outer tube cannot be welded, making existing non-metallic shell-and-tube heat exchangers, such as silicon carbide microchannel reactors and graphite heat exchangers, unable to withstand high pressure.

[0022] In the present invention, the packing sealing structure includes a T-shaped sealing pressure ring sleeve 3, a wedge-shaped inclined surface packing structure 2, a flange flanging joint 4 and an internal compression stopper 5 for limiting and fixing the wedge-shaped inclined surface packing structure 2, which is sleeved on the inner tube 1. The T-shaped sealing pressure ring sleeve 3 has an integrally formed sleeve portion 31 and a flange portion 32. The sleeve portion 31 is sleeved on the inner tube 1 and can fit the outer wall of the inner tube 1. The wedge-shaped inclined surface packing structure 2 and the flange flanging joint 4 are respectively pressed and connected to the sleeve portion 31 and the flange portion 2 of the T-shaped sealing pressure ring sleeve 3 in the radial direction and the axial direction, and an axial sealing surface 9 (circumferential sealing surface) is formed between the sleeve portion 31 of the T-shaped sealing pressure ring sleeve 3 and the outer wall of the inner tube 1, and a radial sealing surface 8 (end face sealing surface) is formed between the flange portion 32 of the T-shaped sealing pressure ring sleeve 3 and the flange flanging joint 4 to prevent leakage and achieve a high-pressure sealing effect.

[0023] The sleeve portion 31 of the T-shaped sealing pressure ring sleeve 3 can increase the direct contact area between the T-shaped sealing pressure ring sleeve 3 and the inner tube 1, thereby also increasing the indirect contact area between the wedge-shaped inclined surface filler structure 2 acting on the T-shaped sealing pressure ring sleeve 3 and the inner tube 1.

[0024] Example 2:

[0025] The difference from Example 1 is that the wedge-shaped inclined packing structure 2 includes a conical packing cavity 21, a conical packing pressure ring sleeve 22 and a diamond-shaped packing pressure ring sleeve 23, and the diamond-shaped packing pressure ring sleeve 23, the conical packing pressure ring sleeve 22 and the conical packing cavity 21 are sequentially mounted on the sleeve portion 31 of the T-shaped sealing pressure ring sleeve 3. Under the limitation of the internal tightening block 5, the axial thrust is converted into an inward-clamping radial sealing force through the cooperation of the conical packing cavity 21, the conical packing pressure ring sleeve 22 and the diamond-shaped packing pressure ring sleeve 23, so that the wedge-shaped inclined packing structure 2 is pressed and connected to the sleeve portion 31 of the T-shaped sealing pressure ring sleeve 3, and at the same time, the T-shaped sealing pressure ring sleeve 3 is fitted on the outer wall of the inner tube 1 to form an axial sealing surface 9.

[0026] The packing cavity of the conventional packing seal structure is an annular structure formed by a cylindrical cavity and an inner tube 1, without bevels or tapers. The packings in the conventional packing seal are all packing strips of uniform specifications, and the packing cavity is directly compressed and connected to the inner tube 1. Therefore, the conventional packing seal structure is prone to the rupture of the inner tube 1, and its sealing pressure is not high.

[0027] Currently, conventional silicon carbide tubular reactors generally have a pressure resistance of 4 bar, and some are said to be able to withstand a pressure of 10 bar.

[0028] The pressure resistance of silicon carbide sintered bonded microchannel reactor is generally below 30 bar.

[0029] The packing sealing structure of the present invention has been verified to be able to withstand a pressure of more than 50 bar through actual experiments.

[0030] The inclination of the conical inclined surfaces on the conical packing pressure ring sleeve 22 and the diamond packing pressure ring sleeve 23 can be adjusted as needed. The overall inclination can be relatively large, but it is preferable not to fracture the inner tube 1.

[0031] The packing sealing structure of the present invention is particularly suitable for high-pressure sealing between the inner tube 1 and the orifice plate of a silicon carbide tube heat exchanger or a tubular reactor having a high thermal conductivity.

[0032] Example 3:

[0033] The difference from Example 2 is that the wedge-shaped inclined surface packing structure 2 also includes an automatic compensating spring device 24, which is sleeved on the inner tube 1 and can generally be a spring sleeved on the inner tube 1. One end of the automatic compensating spring device 24 resists against the inner clamping block 5, and the other end resists against the wide surface of the conical packing pressure ring sleeve 22, continuously generating axial thrust on the conical packing pressure ring sleeve 22.

[0034] Specifically, the automatic compensation spring device 24 provides a continuous axial thrust, and the conical packing pressure ring 22 in the wedge-shaped inclined packing structure 2 amplifies the thrust and converts it into a circumferential sealing pressure that is uniformly tightened inward.

[0035] The compression length and strength of the spring of the automatic compensation spring device 24 can be adjusted according to the actual sealing force.

[0036] Example 4:

[0037] The difference from Example 2 is that the inner wall of the diamond-shaped packing pressing ring sleeve 23 is parallel to the outer wall of the inner tube 1 and the sleeve portion 31 of the T-shaped sealing pressing ring sleeve 3, so that they can slide relative to each other axially.

[0038] Example 5:

[0039] The difference from Example 2 is that the diamond-shaped packing pressure ring sleeve 23 has a first outer bevel and a second outer bevel, the first outer bevel is in contact with the inner wall bevel of the conical packing pressure ring sleeve 22, the second outer bevel is in contact with the inner wall bevel of the conical packing cavity 21, and the outer wall bevel of the conical packing pressure ring sleeve 22 is also in contact with the inner wall bevel of the conical packing cavity 21, that is, the second outer bevel is parallel to the outer wall bevel of the conical packing pressure ring sleeve 22.

[0040] By pushing the conical filler pressing ring 22, it can act on the conical slope filler cavity 21 and the diamond filler pressing ring 23 at the same time, converting the axial thrust into radial pressure to achieve a sealing effect.

[0041] At the same time, due to the mutual transformation and action of forces between the conical bevel filler cavity 21, the conical filler pressure ring sleeve 22 and the diamond filler pressure ring sleeve 23, the contact area of the wedge-shaped bevel filler structure 2 acting on the T-shaped sealing pressure ring sleeve 3 can be increased, and the inner tube 1 is subjected to more uniform force and is not easy to break.

[0042] Example 6:

[0043] The difference from Example 2 is that the two axial ends of the conical filler cavity 21 are respectively formed with flange surfaces that are pressed and fixed with the flange portion 32 of the internal clamping stop block 5 and the T-shaped sealing pressure ring sleeve 3, so that the contact surface of the conical filler cavity 21 and the internal clamping stop block 5 and the T-shaped sealing pressure ring sleeve 3 for clamping and fixing is increased.

[0044] Example 7:

[0045] The difference from Example 1 is that the flange flanging joint 4 and the wedge-shaped inclined surface packing structure 2 and the internal clamping block 5 and the wedge-shaped inclined surface packing structure 2 are fixed respectively by an external clamping flange 6 and a flange fastener 7, and the flange fastener 7 is generally a bolt structure.

[0046] Among them, a pair of external clamping flanges 6 and a group of flange fasteners 7 are respectively provided at the flange flanging joint 4 and the wedge-shaped inclined surface packing structure 2 and the internal clamping stop 5 and the wedge-shaped inclined surface packing structure 2. The pair of external clamping flanges 6 are fixed by a group of flange fasteners 7. The two pairs of external clamping flanges 6 respectively connect and fix the flange flanging joint 4 and the wedge-shaped inclined surface packing structure 2 and the internal clamping stop 5 and the wedge-shaped inclined surface packing structure 2.

[0047] Specifically, a pair of the external clamping flanges 6 are respectively pressed against the two outer end surfaces of the flange flanging joint 4 and the wedge-shaped inclined surface packing structure 2 (which can be the wedge-shaped packing cavity), and are connected and fixed by a group of the flange fasteners 7; another pair of the external clamping flanges 6 are respectively pressed against the two outer end surfaces of the other end of the internal clamping stopper 5 and the wedge-shaped inclined surface packing structure 2 (which can be the wedge-shaped packing cavity), and are connected and fixed by another group of the flange fasteners 7.

[0048] Through the fixed connection between the outer compression flange 6 and the flange fastener 7, the packing sealing structure of the present invention can be disassembled and maintained, and the inner tube 1 can also be freely expanded and contracted, solving the problem that the microchannel reactor in the chemical industry cannot withstand high pressure and is difficult to clear after being blocked.

[0049] Example 8:

[0050] The difference from Example 7 is: Figure 4As shown, a pair of external clamping flanges 6 and two groups of flange fasteners 7 are provided at the flange flanging joint 4 and the wedge-shaped inclined surface packing structure 2 and at the internal clamping stop 5 and the wedge-shaped inclined surface packing structure 2. The pair of external clamping flanges 6 are fixed by the two groups of flange fasteners 7, and the flange flanging joint 4 and the internal clamping stop 5 are connected and fixed to the wedge-shaped inclined surface packing structure 2 through the pair of external clamping flanges 6.

[0051] Specifically, a pair of the outer clamping flanges 6 are respectively pressed against the two outer end surfaces of the inner clamping stop 5 and the flange flanging joint 4, and two groups of the flange fasteners 7 respectively connect and fix the pair of the outer clamping flanges 6 directly to the wedge-shaped inclined surface packing structure 2 (which can be the wedge-shaped packing cavity 21).

[0052] Example 9:

[0053] The difference from Examples 1-8 is that the wedge-shaped inclined surface packing structure 2 is made of PTFE material, that is, it includes a conical packing cavity 21, a conical packing pressure ring sleeve 22 and a diamond-shaped packing pressure ring sleeve 23. PTFE material has excellent corrosion resistance.

[0054] Working principle: The T-shaped sealing pressure ring sleeve 3 is mounted on the inner tube 1 and inserted into the cavity of the conical packing cavity 21. The flange portion 32 of the T-shaped sealing pressure ring sleeve 3 fits with the flange end face of the conical packing cavity 21, and the flange flanging joint 4 and the flange end face of the conical seasoning cavity 21 are pressed together on the flange portion 32 of the T-shaped sealing pressure ring sleeve 3 to form a radial sealing surface 8; the sleeve portion 31 of the T-shaped sealing pressure ring sleeve 3 fits with the outer wall of the inner tube 1, and the conical packing pressure ring sleeve 22 and the diamond-shaped packing pressure ring sleeve 23 are inserted into the conical space of the conical packing cavity 21 in turn. Under the action of the automatic compensation spring device 24, the sleeve portion 31 of the T-shaped sealing pressure ring sleeve 3 is continuously and evenly pressed to form an axial sealing surface 9.

[0055] After the packing sealing structure is installed, the internal compression stop 5 is fixedly connected to the conical inclined packing structure 2 and the flange flanging joint 4 is fixedly connected to the conical inclined packing structure 2 through the external compression flange 6 and the flange fastener 7. The flange portion 32 of the T-shaped sealing pressure ring sleeve 3 and the flange flanging joint 4 are pressed and sealed against each other. The sleeve portion 31 of the T-shaped sealing pressure ring sleeve 3 acts continuously and evenly on the conical packing cavity 21, the conical packing pressure ring sleeve 22 and the diamond packing pressure ring sleeve 23 under the automatic compensation spring device 24, so that the T-shaped sealing pressure ring sleeve 3 is continuously pressed and fitted on the outer wall of the inner tube 1 for sealing, and a good high-pressure sealing effect can be obtained. Moreover, after using the corrosion-resistant non-metallic silicon carbide inner tube 1, a corrosion-resistant and high-pressure resistant sleeve structure can be obtained.

Claims

1. A high-pressure packing seal structure, comprising an inner tube, an outer tube, and a packing seal structure connecting the inner tube and the outer tube, characterized in that: The packing sealing structure includes a T-shaped sealing pressure ring sleeve, a wedge-shaped inclined surface packing structure, a flange flanging joint and an internal compression stopper for limiting and fixing the wedge-shaped inclined surface packing structure, the T-shaped sealing pressure ring sleeve has an integrally formed sleeve portion and a flange portion, the sleeve portion is sleeved on the inner tube, the wedge-shaped inclined surface packing structure and the flange flanging joint are respectively compressed and connected to the sleeve portion and the flange portion of the T-shaped sealing pressure ring sleeve in the radial direction and the axial direction, and form an axial sealing surface between the sleeve portion of the T-shaped sealing pressure ring sleeve and the outer wall of the inner tube and a radial sealing surface between the flange portion of the T-shaped sealing pressure ring sleeve and the flange flanging joint respectively; The wedge-shaped inclined surface packing structure includes a conical packing cavity, a conical packing pressure ring sleeve and a diamond-shaped packing pressure ring sleeve. The diamond-shaped packing pressure ring sleeve, the conical packing pressure ring sleeve and the conical packing cavity are sequentially sleeved on the sleeve portion of the T-shaped sealing pressure ring sleeve. Under the limit of the inner tightening block, the axial thrust is converted into an inward-holding radial sealing force through the cooperation of the conical packing cavity, the conical packing pressure ring sleeve and the diamond-shaped packing pressure ring sleeve, so that the wedge-shaped inclined surface packing structure is tightly connected to the sleeve portion of the T-shaped sealing pressure ring sleeve; The wedge-shaped inclined surface packing structure further includes an automatic compensating spring device, which is sleeved on the inner tube. One end of the automatic compensating spring device resists against the inner compression stopper, and the other end resists against the wide surface of the conical packing pressure ring sleeve, thereby continuously generating an axial thrust on the conical packing pressure ring sleeve. The inner wall of the diamond-shaped packing pressure ring sleeve is parallel to the outer wall of the inner tube and the sleeve portion of the T-shaped sealing pressure ring sleeve, so that they can slide relative to each other in the axial direction.

2. A high-pressure packing sealing structure according to claim 1, characterized in that: The diamond-shaped packing pressure ring sleeve has a first outer bevel and a second outer bevel. The first outer bevel fits with the inner wall bevel of the conical packing pressure ring sleeve, and the second outer bevel fits with the inner wall bevel of the conical packing cavity. The outer wall bevel of the conical packing pressure ring sleeve also fits with the inner wall bevel of the conical packing cavity.

3. The high-pressure packing sealing structure according to claim 1, characterized in that: The two axial ends of the conical filler cavity are respectively formed with flange surfaces which are pressed and fixed with the inner pressing block and the flange portion of the T-shaped sealing pressure ring sleeve.

4. A high-pressure packing sealing structure according to claim 1, characterized in that: The flange flanging joint and the wedge-shaped inclined surface filler structure, and the inner pressing block and the wedge-shaped inclined surface filler structure are fixed respectively by an outer pressing flange and a flange fastener.

5. A high-pressure packing sealing structure according to claim 4, characterized in that: A pair of external compression flanges and a group of flange fasteners are respectively provided at the flange flanging joint and the wedge-shaped inclined surface packing structure and the internal compression stop block and the wedge-shaped inclined surface packing structure. The pair of external compression flanges are fixed by a group of flange fasteners. The two pairs of external compression flanges respectively connect and fix the flange flanging joint and the wedge-shaped inclined surface packing structure and the internal compression stop block and the wedge-shaped inclined surface packing structure.

6. A high-pressure packing sealing structure according to claim 4, characterized in that: A pair of external compression flanges and two groups of flange fasteners are provided at the flange flanging joint and the wedge-shaped inclined surface packing structure and at the internal compression stopper and the wedge-shaped inclined surface packing structure. The pair of external compression flanges are fixed by the two groups of flange fasteners, and the flange flanging joint and the internal compression stopper are connected and fixed to the wedge-shaped inclined surface packing structure through the pair of external compression flanges.

7. A high-pressure packing sealing structure according to any one of claims 1 to 6, characterized in that: The wedge-shaped inclined surface filler structure is made of PTFE material.

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