A polyfluoroethylene lining structure resistant to high and low temperatures and negative pressure

Abstract

The present invention relates to the field of polytetrafluoroethylene lining structures, and in particular provides a polytetrafluoroethylene lining structure that is resistant to high and low temperatures and negative pressures, comprising: an outer shell; a mesh plate, which is arranged on the inner surface of the outer shell; a grid plate, which is arranged in the mesh plate, and an adjustment mechanism is arranged on the grid plate to adjust the distance between the grid plate and the mesh plate; a lining layer, which is coated on the surface of the grid plate and the mesh plate, and is connected to the outer shell; wherein the lining layer is made of polytetrafluoroethylene. The polytetrafluoroethylene lining structure that is resistant to high and low temperatures and negative pressures of the present invention uses the mesh plate and the grid plate to jointly support the lining layer, thereby improving the structural strength. The lining layer is arranged to coat the mesh plate and the grid plate, and is in contact with the outer shell at the same time, thereby improving the connection strength of the lining layer, reducing the risk of the lining layer falling off, and improving the negative pressure resistance performance. The adjustment mechanism is arranged to make the distance between the grid plate and the mesh plate adjustable, thereby improving the ease of installation and enabling the grid plate to be close to the mesh plate, thereby further improving the structural strength.

Description

Technical Field

[0001] The invention relates to a polyfluoroethylene lining structure, in particular to a polyfluoroethylene lining structure which is resistant to high and low temperatures and negative pressure. Background Art

[0002] Tetrafluoroethylene refers to polytetrafluoroethylene (PTFE for short), which is a polymer compound made from tetrafluoroethylene through polymerization. It has good high and low temperature resistance and corrosion resistance.

[0003] The prior art usually attaches a layer of polytetrafluoroethylene sheet to the innermost layer of the component to form a lining structure to improve its high and low temperature resistance and corrosion resistance. For example, patent CN107631108A discloses an adhesive transmission hose with a barrier layer and a method of use, in which a polytetrafluoroethylene-supported lining is arranged on the inner surface of the inner tube. However, its overall strength is poor, the risk of lining shedding is high, and the negative pressure resistance effect is not good. Patent CN209354865U discloses a new type of anti-corrosion fluoroplastic lined pipe, in which a mesh grille is fixedly installed inside the anti-corrosion fluorine pipe. Although it can improve some strength, it will affect the resistance of the anti-corrosion fluorine pipe itself. In addition, when installing the mesh grille, in order to ensure that the mesh grille can be installed smoothly, the size of the mesh grille is often smaller than the size that the lining (tetrafluoro layer) actually needs to cover, resulting in that part of the lining area cannot cover the mesh grille, which not only affects the overall support effect, but also has poor negative pressure resistance. Summary of the invention

[0004] One object of the present invention is to improve the overall strength of a polyfluoro lining structure that is resistant to high and low temperatures and negative pressure.

[0005] Another object of the present invention is to reduce the risk of lining shedding of the lining layer of the high-temperature and negative-pressure resistant polyfluoroethylene lining structure and to improve the negative-pressure resistance effect.

[0006] In particular, the present invention provides a polytetrafluoroethylene lining structure that is resistant to high and low temperatures and negative pressure, comprising: an outer shell; a mesh plate, which is arranged on the inner surface of the outer shell; a grid plate, which is arranged inside the grid plate, and an adjustment mechanism is provided on the grid plate to adjust the distance between the grid plate and the grid plate; a lining layer, which is coated on the surface of the grid plate and the mesh plate and is connected to the outer shell; wherein the lining layer is made of polytetrafluoroethylene.

[0007] Furthermore, the outer shell, the mesh plate and the grid plate are all configured into a cylindrical shape; the two ends of the grid plate are butt-jointed to form a cylindrical shape, one end of which is provided with a first notch, and the grids on both sides of the first notch are inclined toward the first notch; the adjustment mechanism includes a first pull rod and a second pull rod, which are arranged on the end surface of the grid plate where the first notch is opened; the first pull rod and the second pull rod are arranged along the axial direction of the grid plate and are respectively located on both sides of the first notch; the first pull rod and the second pull rod are configured to move in a direction away from the first notch to pull the grids on both sides of the first notch to rotate, so that the cylindrical diameter of the grid plate increases.

[0008] Furthermore, a second notch corresponding to the first notch is provided at the other end of the grid plate; the adjustment mechanism also includes a compression spring and a top block, which are arranged at the second notch; one end of the compression spring is fixedly connected to the grid plate, and the other end is fixedly connected to the top block; under the thrust of the compression spring, the top block partially extends into the first notch along the direction of the second notch and engages with the side wall surfaces on both sides of the first notch; wherein ratchet teeth that match each other are respectively provided on the wall surfaces where the top block and the first notch contact, so as to prevent the top block from retracting.

[0009] Furthermore, the lining is made by heating and melting polytetrafluoroethylene powder sprayed on the grid plate and the mesh plate or polytetrafluoroethylene plates attached to the inner side of the grid plate.

[0010] Optionally, the grid is configured to be pressed against the screen by an adjustment mechanism before preparing the lining.

[0011] Optionally, the grid plate is configured so that, during the preparation process of the lining layer, the distance between the grid plate and the mesh plate is gradually reduced by adjusting the adjustment mechanism until the grid plate and the mesh plate are in close contact.

[0012] Furthermore, the housing is configured to drive the grid plate and the mesh plate to rotate during the preparation of the lining.

[0013] Furthermore, the housing is configured to drive the grid plate and the mesh plate to rotate in a forward and reverse cycle.

[0014] Furthermore, the mesh direction of the screen plate crosses the grid direction of the grid plate.

[0015] Furthermore, the shell, the mesh plate and the grid plate are made of steel.

[0016] The beneficial effects of the present invention are:

[0017] The polytetrafluoroethylene lining structure resistant to high and low temperatures and negative pressure of the present invention is improved in structural strength by sequentially arranging a mesh plate, a grid plate and a lining layer in an outer shell, and using the mesh plate and the grid plate to jointly support the lining layer. The lining layer is arranged to cover the mesh plate and the grid plate, and is in contact with the outer shell at the same time, thereby improving the connection strength of the lining layer, reducing the risk of the lining layer falling off, and improving the negative pressure resistance performance. The lining layer is made of polytetrafluoroethylene, which is not only resistant to high and low temperatures, but also chemically stable, has strong corrosion resistance, and has a long service life. By arranging an adjustment mechanism, the spacing between the grid plate and the mesh plate is adjustable, which improves the ease of installation while allowing the grid plate to be close to the mesh plate, thereby further improving the structural strength.

[0018] Furthermore, the high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure of the present invention is provided with a first pull rod and a second pull rod at the joint of the grid plate, and the inclined grid is pulled and rotated by the first pull rod and the second pull rod, so that the joint of the grid plate is stretched. The cylinder diameter of the grid plate is increased, so that the grid plate is close to the mesh plate, which is not only simple to install and easy to operate, but also realizes the full coverage of the inner surface of the mesh plate by the grid plate, so that the supporting force provided by the grid plate to the lining layer is more uniform, thereby improving the supporting effect of the grid plate and further reducing the risk of the lining layer falling off.

[0019] Furthermore, the high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure of the present invention is provided with a lining layer made of polytetrafluoroethylene powder or polytetrafluoroethylene plates that are heated and melted, and the melting characteristics of polytetrafluoroethylene are utilized to enable polytetrafluoroethylene to fill all gaps between the mesh plate, the grid plate, and the outer shell. After curing, the outer shell, the mesh plate, the grid plate, and the lining layer are connected to form an integrated structure, which improves the connection strength of the lining layer, reduces the risk of the lining layer falling off, and further improves the negative-pressure resistance of the polytetrafluoroethylene lining structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. In the accompanying drawings:

[0021] Figure 1 This is a schematic structural diagram of a polyfluoroethylene lining structure that is resistant to high and low temperatures and negative pressure according to an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of an explosion of a polyfluoro lining structure resistant to high and low temperatures and negative pressure according to an embodiment of the present invention;

[0023] Figure 3 yes Figure 2 Schematic enlarged view of region A;

[0024] Figure 4 is a structural schematic diagram from another angle of a polyfluoro lining structure resistant to high and low temperatures and negative pressure according to an embodiment of the present invention;

[0025] Figure 5 is along Figure 4 A cross-sectional view taken along the cutting line BB in FIG.

[0026] Figure 6 yes Figure 5 Schematic enlargement of region C;

[0027] Figure 7 This is a structural schematic diagram of a polyfluoroethylene lining structure resistant to high and low temperatures and negative pressure according to an embodiment of the present invention from another angle;

[0028] Figure 8 is along Figure 7 A schematic cross-sectional view taken along the cutting line DD in FIG.

[0029] Fig. 9 yes Figure 8 Schematic enlargement of the middle region E;

[0030] Fig.10 It is a schematic structural diagram of a grid plate with a polyfluoro lining structure that is resistant to high and low temperatures and negative pressure according to an embodiment of the present invention;

[0031] Fig.11 It is a schematic diagram of the partial structure of a grid plate with a polyfluoro lining structure that is resistant to high and low temperatures and negative pressure according to an embodiment of the present invention;

[0032] Fig.12 yes Fig.11 Schematic enlargement of region F in the middle.

[0033] Among them: 100, shell; 200, mesh plate; 300, grid plate; 310, adjustment mechanism; 311, first pull rod; 312, second pull rod; 313, compression spring; 314, top block; 315, ratchet; 320, first notch; 330, second notch; 400, lining. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The terms "first" and "second" herein are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0036] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0037] It should be understood that the terms "inside", "outside", "axial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] Refer to the following Figures 1 to 12 To describe a polyfluoro lining structure that is resistant to high and low temperatures and negative pressure provided by the present invention.

[0039] like Figure 1-9 As shown, this embodiment first provides a high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure. The high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure generally includes: a housing 100, a mesh plate 200, a grid plate 300, and a lining layer 400.

[0040] The mesh plate 200 is arranged on the inner surface of the housing 100. The grid plate 300 is arranged inside the mesh plate 200, and the grid plate 300 is provided with an adjustment mechanism 310 for adjusting the distance between the grid plate 300 and the mesh plate 200. The lining layer 400 is coated on the surfaces of the grid plate 300 and the mesh plate 200, and is connected to the housing 100. The lining layer 400 is made of polytetrafluoroethylene.

[0041] The solution of this embodiment is to sequentially arrange the mesh plate 200, the grid plate 300 and the lining layer 400 in the housing 100, and use the mesh plate 200 and the grid plate 300 to jointly support the lining layer 400, thereby strengthening the overall structural strength of the polytetrafluoroethylene lining structure that is resistant to high and low temperatures and negative pressure. The lining layer 400 is arranged to cover the grid plate 300 and the mesh plate 200 and to contact the housing 100, thereby improving the connection strength of the lining layer 400, reducing the risk of the lining layer 400 falling off, and improving the negative pressure resistance performance. By arranging an adjustment mechanism 310 on the grid plate 300, the distance between the grid plate 300 and the mesh plate 200 is adjustable, which improves the ease of installation and enables the grid plate 300 to be close to the mesh plate 200, thereby improving the structural strength. The lining layer 400 is made of polytetrafluoroethylene, which is not only resistant to high and low temperatures, but also chemically stable, has strong corrosion resistance, and has a long service life.

[0042] like Figure 2 As shown, in some embodiments, the housing 100 , the mesh plate 200 , and the grid plate 300 are all configured in a cylindrical shape.

[0043] like Figure 10-12 As shown, the two ends of the grid plate 300 are butted together to form a cylindrical shape, one end of which is provided with a first notch 320, and the grids on both sides of the first notch 320 are inclined toward the first notch 320. The adjustment mechanism 310 generally includes a first pull rod 311 and a second pull rod 312. The first pull rod 311 and the second pull rod 312 are arranged on the end surface of the grid plate 300 where the first notch 320 is opened. The first pull rod 311 and the second pull rod 312 are arranged along the axial direction of the grid plate 300 and are respectively located on both sides of the first notch 320. The first pull rod 311 and the second pull rod 312 are configured to move in a direction away from the first notch 320 to pull the grids on both sides of the first notch 320 to rotate, so that the cylindrical diameter of the grid plate 300 is increased.

[0044] The solution of this embodiment is to set a first pull rod 311 and a second pull rod 312 at one end of the joint of the grid plate 300, and use the first pull rod 311 and the second pull rod 312 to pull the inclined grid to rotate in a direction away from the first notch 320, so that the joint of the grid plate 300 is stretched open. The cylinder diameter of the grid plate 300 is increased, so that the grid plate 300 is close to the mesh plate 200, which is not only simple to install and easy to operate, but also the two ends of the grid plate 300 are always butted together, so that the grid plate 300 fully covers the inner surface of the mesh plate 200, so that the support force provided by the grid plate 300 to the lining 400 is more uniform, thereby improving the support effect of the grid plate 300 and further reducing the risk of the lining 400 falling off.

[0045] In some preferred embodiments, the first notch 320 is disposed in the middle of the grid plate 300, and the first pull rod 311 and the second pull rod 312 are symmetrically disposed relative to the first notch 320. When the first pull rod 311 and the second pull rod 312 pull the inclined grids on both sides of the first notch 320 to rotate, under the same force applied by the first pull rod 311 and the second pull rod 312, the rotation amplitude of the grids on both sides of the first notch 320 remains consistent, thereby ensuring the close docking of the grid plate 300 and achieving a full coverage effect of the grid plate 300 on the mesh plate 200.

[0046] The size of the high-temperature-resistant and negative-pressure-resistant polyfluoro lining structure can be set according to actual needs. In some embodiments, the size of the high-temperature-resistant and negative-pressure-resistant polyfluoro lining structure is set smaller and is configured to be used on a pipeline. In other embodiments, the size of the high-temperature-resistant and negative-pressure-resistant polyfluoro lining structure is set larger and is configured to be used on the housing of the equipment.

[0047] The other end of the grid plate 300 is provided with a second notch 330 corresponding to the first notch 320. The adjustment mechanism 310 may generally further include a compression spring 313 and a top block 314, which are arranged at the second notch 330. One end of the compression spring 313 is fixedly connected to the grid plate 300, and the other end is fixedly connected to the top block 314. Under the thrust of the compression spring 313, the top block 314 partially extends into the first notch 320 along the direction of the second notch 330, and is engaged with the side wall surfaces on both sides of the first notch 320. Ratchet teeth 315 adapted to each other are respectively arranged on the wall surfaces where the top block 314 and the first notch 320 contact, so as to prevent the top block 314 from retracting.

[0048] like Fig.11 As shown, the top block 314 is disposed in the second notch 330, and the portion of the side wall of the top block 314 away from the first notch 320 contacts the side wall of the second notch 330, and moves in the direction of the second notch 330 under the guidance of the side wall of the second notch 330. The portion of the top block 314 close to the first notch 320 is formed with an inclined surface extending from the second notch 330 to the first notch 320 from the outside to the inside. The side wall of the first notch 320 is formed with an inclined surface adapted to the side wall of the top block 314.

[0049] The end surface of the top block 314 close to the second notch 330 is connected to the compression spring 313. In some preferred embodiments, the top block 314 can be integrally formed with the compression spring 313 and the grid plate 300.

[0050] In the solution of this embodiment, a corresponding second notch 330 is provided at the other end of the grid plate 300 where it is connected, and a compression spring 313 and a top block 314 are provided in the second notch 330, so that the top block 314 can partially extend into the first notch 320 and engage with the wall surface of the first notch 320. The two ends of the grid plate 300 are connected together by the compression spring 313 and the top block 314, thereby improving the structural stability of the grid plate 300.

[0051] After the first pull rod 311 and the second pull rod 312 are subjected to the axial outward pulling force along the grid plate 300, the grids on both sides of the first notch 320 are pulled to rotate in the direction away from the first notch 320, so that the first notch 320 is enlarged, and the top block 314, under the thrust of the compression spring 313, penetrates into the first notch 320 until it abuts against the side wall of the first notch 320 again. By providing the ratchet 315 on the wall surface where the top block 314 and the first notch 320 contact, after the top block 314 extends into the first notch 320 and the ratchet 315 is engaged, the top block 314 cannot retract into the second notch 330. In the case that the top block 314 does not retract, after the distance between the grid plate 300 and the mesh plate 200 is adjusted, the pulling force of the first pull rod 311 and the second pull rod 312 is removed, and the grids on both sides of the first notch 320 cannot be reset under the pressure of the top block 314, thereby ensuring the structural stability of the grid plate 300.

[0052] In some embodiments, grids inclined toward the second notch 330 may also be provided on both sides of the second notch 330, and corresponding third and fourth pull rods may also be provided on both sides of the second notch 330. The first pull rod 311, the second pull rod 312, the third pull rod and the fourth pull rod cooperate with each other to improve the adjustment efficiency of the cylinder diameter of the grid plate 300 and increase the adjustable range of the cylinder diameter of the grid plate 300.

[0053] The lining 400 is made by heating and melting the polytetrafluoroethylene powder sprayed on the grid plate 300 and the mesh plate 200 or the polytetrafluoroethylene plate attached to the inner side of the grid plate 300.

[0054] In the solution of this embodiment, the polytetrafluoroethylene material is melted by heating, so that each gap between the shell 100 and the mesh plate 200 and the grid plate 300 can be filled. The lining layer 400 formed by the polytetrafluoroethylene material after melting, advection and solidification is not only structurally complete and seamless, but also closely connected with the shell 100, the mesh plate 200 and the grid plate 300 to form an integrated structure, thereby improving the structural strength and negative pressure resistance of the polytetrafluoroethylene lining structure.

[0055] In some embodiments, the lining 400 may be made of polytetrafluoroethylene powder sprayed on the grid plate 300 and the mesh plate 200. The polytetrafluoroethylene powder is sprayed on the grid plate 300 and the mesh plate 200, and melts and flows through heating, so that the gap between the grid plate 300 and the mesh plate 200 is filled with polytetrafluoroethylene. The lining 400 prepared with polytetrafluoroethylene powder can better fill the gap between the housing 100, the mesh plate 200 and the grid plate 300, and has relatively better anti-negative pressure performance.

[0056] After the heating is stopped, the polytetrafluoroethylene gradually solidifies at room temperature to form the lining layer 400. The lining layer 400 covers the grid plate 300 and the mesh plate 200 and is connected to the shell 100 to form an integrated structure, thereby improving the overall strength of the polytetrafluoroethylene lining structure.

[0057] In other embodiments, the lining 400 may be made of polytetrafluoroethylene plates attached to the inner side of the grid plate 300. Multiple polytetrafluoroethylene plates are attached to the inner side of the grid plate 300 along the circumferential direction. Under the heating of the heat source outside the shell 100, the polytetrafluoroethylene plates melt, and while filling the gaps between the grid plate 300, the mesh plate 200 and the shell 100, adjacent polytetrafluoroethylene plates are fused and connected together. The lining 400 prepared by using polytetrafluoroethylene plates has a relatively higher overall strength and a more uniform thickness of the lining 400.

[0058] In some preferred embodiments, during the preparation of the lining 400 , the polytetrafluoroethylene material may be pressurized by means of a pressurizing device to make the connection between the polytetrafluoroethylene material and the housing 100 , the mesh plate 200 and the grid plate 300 tighter.

[0059] The grid plate 300 is configured to be in close contact with the screen plate 200 by the adjustment mechanism 310 before the lining layer 400 is prepared.

[0060] In some embodiments, before starting to prepare the lining 400, the spacing between the grid plates 300 of the mesh plate 200 can be adjusted to zero by the adjustment mechanism 310, so that the grid plates 300 are close to the mesh plate 200, so as to enhance the overall structural strength and structural stability of the polytetrafluoroethylene lining structure that is resistant to high and low temperatures and negative pressure.

[0061] The grid plate 300 is configured such that, during the preparation process of the lining layer 400 , the distance between the grid plate 300 and the mesh plate 200 is gradually reduced by adjusting the adjustment mechanism 310 until the grid plate 300 and the mesh plate 200 are in close contact.

[0062] In other embodiments, before the lining 400 is prepared, a certain distance may be set between the grid plates 300 of the screen 200. During the preparation of the lining 400, the distance between the grid plates 300 and the screen 200 is gradually reduced by controlling the adjustment mechanism 310 until the grid plates 300 and the screen 200 are in close contact. Polytetrafluoroethylene is also present between the contact points formed after the grid plates 300 and the screen 200 are in close contact, so that the grid plates 300 and the screen 200 are connected more firmly, further improving the connection strength of the lining 400 and reducing the risk of the lining 400 falling off.

[0063] The housing 100 is configured to drive the grid plate 300 and the mesh plate 200 to rotate during the preparation process of the lining layer 400 .

[0064] In the scheme of this embodiment, the outer shell 100 is arranged to drive the grid plate 300 and the mesh plate 200 to rotate together, so that during the preparation process of the lining 400, the polytetrafluoroethylene in a molten state can be more evenly distributed on the outer shell 100, the mesh plate 200 and the grid plate 300 under the action of centrifugal force.

[0065] In some embodiments, since grids inclined toward the first notch 320 are provided on both sides of the first notch 320 , during the rotation of the grids, the polytetrafluoroethylene material will move axially while moving circumferentially along the grids under the action of the grids, thereby improving the distribution uniformity of the polytetrafluoroethylene material.

[0066] The housing 100 is configured to drive the grid plate 300 and the mesh plate 200 to rotate in a forward and reverse cycle.

[0067] In the solution of this embodiment, the housing 100 is arranged to drive the grid plate 300 and the mesh plate 200 to rotate in a forward and reverse cycle, thereby avoiding the problem of unilateral accumulation of the polytetrafluoroethylene material on the grid plate 300 and the mesh plate 200 caused by rotation in a single direction, and improving the uniformity of the distribution of the polytetrafluoroethylene material in the circumferential direction.

[0068] In some embodiments, since grids inclined toward the first notch 320 are provided on both sides of the first notch 320 , during the forward and reverse cyclic rotation of the grids, the polytetrafluoroethylene material will reciprocate along the axial direction under the action of the grids, further improving the distribution uniformity of the polytetrafluoroethylene material.

[0069] The mesh direction of the screen plate 200 and the grid direction of the grid plate 300 intersect.

[0070] In the solution of this embodiment, the grid direction of the mesh plate 200 and the grid direction of the grid plate 300 are cross-arranged, so that the support force of the mesh plate 200 and the grid plate 300 on the lining layer 400 is more evenly distributed, thereby improving the support effect of the grid plate 300 and the mesh plate 200 on the lining layer 400.

[0071] The housing 100 , the mesh plate 200 and the grid plate 300 are made of steel.

[0072] In the solution of this embodiment, the outer shell 100, the mesh plate 200 and the grid plate 300 are all made of steel, which ensures the overall strength of the polytetrafluoroethylene lining structure that is resistant to high and low temperatures and negative pressure, and improves the supporting effect of the outer shell 100, the mesh plate 200 and the grid plate 300 on the lining 400.

[0073] In some preferred embodiments, the shell 100 can be made of carbon steel. As the outermost layer of the high-low-temperature-resistant and negative-pressure-resistant polyfluoro lining structure, the shell 100 is made of carbon steel with good hardness and strength, thereby improving the overall strength of the high-low-temperature-resistant and negative-pressure-resistant polyfluoro lining structure and improving the bearing performance of the high-low-temperature-resistant and negative-pressure-resistant polyfluoro lining structure to external stress.

[0074] In some preferred embodiments, the grid plate 300 and the mesh plate 200 may be made of stainless steel, which not only has good ductility but also has excellent corrosion resistance.

[0075] The specific preparation process of the high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure provided by the present invention is described in combination with the above embodiments:

[0076] First, the housing 100, the screen 200 and the grid 300 are sequentially sleeved together. Then, polytetrafluoroethylene powder is sprayed on the housing 100, the screen 200 and the grid 300, or a polytetrafluoroethylene plate is attached to the grid 300. After that, the sprayed polytetrafluoroethylene powder or the attached polytetrafluoroethylene plate is heated to form a lining 400 after melting, advection and solidification. During the preparation process of the lining 400, the housing 100 drives the screen 200 and the grid 300 to rotate in a forward and reverse cycle to improve the uniformity of the lining 400 and the tightness of the connection between the lining 400 and the housing 100, the screen 200, the grid 300, etc. Among them, the spacing between the grid 300 and the screen 200 can be adjusted by the adjustment mechanism 310. The grid 300 can be in close contact with the screen 200 before the preparation of the lining 400 begins, or gradually in close contact with the screen 200 during the preparation process of the lining 400.

[0077] The polytetrafluoroethylene lining structure resistant to high and low temperatures and negative pressure provided by the present invention has a stable shape and tensile strength within the use temperature range of -200°C to 260°C, because polytetrafluoroethylene has good heat resistance and cold resistance. Since the grid plate 300 can completely cover the entire inner surface of the mesh plate 200, after the lining layer 400 is coated on the grid plate 300, the grid plate 300 has a more uniform and comprehensive support force on the lining layer 400, thereby reducing the risk of the lining layer 400 falling off. Since the lining layer 400 completely covers the grid plate 300 and the mesh plate 200, it forms an integrated structure with the shell 100, the grid plate 300 and the mesh plate 200, and the tensile force of the shell 100, the grid plate 300 and the mesh plate 200 on the lining layer 400 is used to ensure the tensile resistance of the lining layer 400, so that the lining layer 400 can also maintain a good shape and will not delaminate under negative pressure, thereby improving the negative pressure resistance performance of the lining layer 400.

[0078] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A polyfluoro lining structure resistant to high and low temperatures and negative pressure, characterized in that: include: shell; A mesh plate is arranged on the inner surface of the shell; A grid plate is arranged inside the mesh plate, and an adjustment mechanism is arranged on the grid plate to adjust the distance between the grid plate and the mesh plate; A lining layer is coated on the surface of the grid plate and the mesh plate and connected to the shell; wherein, The lining is made of polytetrafluoroethylene; The housing, the mesh plate and the grid plate are all configured in a cylindrical shape; The two ends of the grid plate are butt-jointed to form a cylindrical shape, one end of which is provided with a first notch, and the grids on both sides of the first notch are inclined toward the first notch; The other end of the grid plate is provided with a second notch corresponding to the first notch; The adjusting mechanism comprises a compression spring and a top block, and the compression spring and the top block are arranged at the second notch; One end of the compression spring is fixedly connected to the grid plate, and the other end is fixedly connected to the top block; The portion of the top block close to the first notch is formed with an inclined surface extending from the second notch to the first notch from the outside to the inside; the side wall of the first notch is formed with an inclined surface adapted to the side wall of the top block; under the thrust of the compression spring, the top block partially extends into the first notch along the direction of the second notch and engages with the side wall surfaces on both sides of the first notch; wherein, Ratchets adapted to each other are respectively arranged on the wall surface where the top block and the first notch contact, so as to prevent the top block from retracting; The adjustment mechanism also includes a first pull rod and a second pull rod, which are arranged on the end surface of the grid plate where the first notch is opened; the first pull rod and the second pull rod are arranged along the axial direction of the grid plate and are respectively located on both sides of the first notch; the first pull rod and the second pull rod are configured to move in a direction away from the first notch to pull the grids on both sides of the first notch to rotate, so that the cylindrical diameter of the grid plate increases.

2. The high-temperature and negative-pressure resistant polyfluoroethylene lining structure according to claim 1, characterized in that: The lining layer is made by heating and melting polytetrafluoroethylene powder sprayed on the grid plate and the mesh plate or polytetrafluoroethylene plates attached to the inner side of the grid plate.

3. The high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure according to claim 2 is characterized in that: The grid plate is configured to be pressed against the screen plate by the adjustment mechanism before preparing the lining layer.

4. The high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure according to claim 2, characterized in that: The grid plate is configured so that, during the preparation process of the lining layer, the distance between the grid plate and the mesh plate is gradually reduced by adjusting the adjustment mechanism until the grid plate and the mesh plate are in close contact.

5. The high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure according to claim 2, characterized in that: The shell is configured to drive the grid plate and the mesh plate to rotate during the preparation process of the lining layer.

6. The high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure according to claim 5, characterized in that: The housing is configured to drive the grid plate and the mesh plate to rotate in a forward and reverse cycle.

7. The high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure according to claim 1, characterized in that: The mesh direction of the screen plate crosses the grid direction of the grid plate.

8. The high-low-temperature-resistant and negative-pressure-resistant polytetrafluoroethylene lining structure according to claim 1, characterized in that: The shell, the mesh plate and the grid plate are made of steel.

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