JPH0513735U - Curved tube with ceramic lining - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a chemical-resistant and abrasion-resistant curved tube lined with ceramics, which is excellent in chemical resistance and abrasion resistance. [Structure] A metal curved tube 1, a synthetic resin coating layer 2 that covers the inner peripheral surface thereof and has high chemical resistance, and a ceramic lining layer 3 that covers the inner peripheral surface of the synthetic resin coating layer 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chemical-resistant and wear-resistant curved pipe lined with ceramics.

[0002]

[Prior Art]

 In general, piping for fluids such as chemicals is required to have chemical resistance, but when solid particles are contained in the fluid, abrasion resistance is also required at the same time. Therefore, for example, a curved pipe in which the inner surface of the metal pipe 101 is lined with a synthetic resin 102 as shown in FIG. 2 or a curved pipe in which the inner surface of the metal pipe 201 is lined with a ceramic 202 as shown in FIG. 3 is used. There is.

[0003]

[Problems to be solved by the device]

 In the case of a curved pipe in which the inner surface of the metal tube 101 is lined with a synthetic resin 102, generally, the abrasion resistance is low, and the synthetic resin 102 is abraded within a short period of time to expose the inner surface of the metal tube 101 and cause corrosion. There is a problem. On the other hand, when the inner surface of the metal tube 201 is lined with the ceramic 202, it is possible to obtain high abrasion resistance, but it is extremely difficult to form a uniform lining layer with a uniform thickness on the inner surface of the metal curved tube. It is difficult, and as shown in Fig. 3, a short ring-shaped ceramic tube 202a whose both ends are obliquely cut so as to form a trapezoid when viewed from the side is inserted into the metal tube 201 in order, and a short straight tubular ceramic tube is provided at both ends. I am trying to insert 202b. Therefore, there is a problem that the chemical penetrates into the curved metal tube 201 through the gap formed between the ceramic tubes 202a and 202b, and the corrosion of the curved metal tube 201 due to the chemical cannot be effectively prevented.

In view of the above circumstances, an object of the present invention is to provide a curved pipe having excellent chemical resistance and abrasion resistance.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a ceramic-lined chemical-resistant and abrasion-resistant curved pipe according to the present invention comprises a metal curved pipe, a synthetic resin coating layer with high chemical resistance for covering the inner peripheral surface thereof, A ceramic lining layer covering the inner peripheral surface of the synthetic resin coating layer is provided.

[0006]

[Action]

 In the present invention, the ceramic lining layer, which is in contact with the solid particles contained in the fluid flowing in the curved pipe, has a high surface hardness and is not easily worn. Also, the chemical that permeates into the metal curved pipe side through the gap of the ceramic lining layer is blocked from the metal curved pipe by the synthetic resin coating layer, so there is no risk of the metal curved pipe being corroded by the chemical. Furthermore, since there is no risk of corrosion of the metal curved pipe due to the chemicals that have penetrated the ceramic lining layer, the ceramic lining layer has a ring shape with both ends cut diagonally so that it is trapezoidal when viewed from the side as in the conventional case. It may be composed of a short ceramic tube and a straight tubular ceramic tube of which both ends are short.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. A curved pipe according to an embodiment of the present invention is, for example, a metallic curved pipe 1 made of cast iron, a synthetic resin coating layer 2 formed inside the metallic curved pipe 1, and a synthetic resin coating layer 2 thereof. And a ceramic lining layer 3 composed of ceramic tubes 3a, 3b, 3c formed inside.

The ceramic lining layer 3 is adhered to the synthetic resin coating layer 2 with an adhesive 4 in order to prevent the ceramic lining layer 3 from moving due to the pressure of the fluid flowing inside. The synthetic resin material constituting the synthetic resin coating layer 2 may be any material having high chemical resistance, and for example, a fluororesin such as tetrafluoroethylene (trade name Teflon), monochlorotrifluoroethylene, or fluoroethylenepropylene is used. .. These resins are extremely excellent in corrosion resistance as shown in Table 1 for comparison of corrosion resistance.

[0009]

[Table 1]

Further, the synthetic resin coating layer 2 prevents the fluid from penetrating into the metal curved pipe 1 through a gap between the synthetic resin coating layer 2 and the pipe connected to the synthetic resin coating layer 2, so that the synthetic resin coating layer 2 can be connected from the inner surface 1a of the metal curved pipe 1 to the contact end surfaces 1b at both ends. Are continuously formed. As the material of the ceramic lining layer 3, those generally used as ceramics can be used, but it is particularly preferable to use those having a composition having high abrasion resistance. As such a ceramic with a particularly high wear resistance, an alumina ceramic containing 90% or more, preferably 99% or more of Al ₂ O ₃ with the balance being SiO ₂ , MgO, CaO, or Si ₃ N ₄ Silicon nitride ceramics containing Al ₂ O ₃ , Y ₂ O ₃ and other sintering aids as the main component, carbon (c), boron (B), Al ₂ O ₃ , Y ₂ O ₃ containing SiC as the main component It is possible to use a silicon carbide based ceramic containing a sintering aid such as. In this example, a ceramic (Al ₂ O ₃ purity 99.5%) containing alumina as a main component, which is relatively easily available, was used.

The adhesive 4 is not particularly limited, but it is preferable to use one having high chemical resistance, and an epoxy adhesive is used here. In this curved pipe, since the fluid flowing inside contacts the ceramic lining layer 3 having excellent wear resistance, the inner surface of the pipe is less likely to be worn, and the ceramic pipes 3a, 3b, 3c of the ceramic lining layer 3 are not easily worn. The chemical that permeates into the curved metal tube 1 side through the gap is blocked from the curved metal tube 1 by the synthetic resin coating layer 2, so that the curved metal tube 1 is not corroded by the chemical and the replacement cycle of the pipe is significantly lengthened. I can now do it.

Further, since the chemical penetration into the ceramic lining layer 3 is not a problem, the ceramic lining layer 3 can be formed by abutting the short ring-shaped ceramic tubes 3a, 3b, 3c, and can be continuous. The ceramic lining layer 3 can be formed much cheaply and easily as compared with the case of forming the curved tubular ceramic lining layer 3.

[0013]

[Effect of the device]

 As described above, according to the present invention, the chemical resistance can be secured by the synthetic resin coating layer, and the abrasion resistance of the inner surface of the pipe can be enhanced by the ceramic lining layer, so that the life of the curved pipe can be remarkably extended. Therefore, it is possible to significantly lengthen the replacement period of the curved pipe.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional example.

FIG. 3 is a vertical cross-sectional view of another conventional example.

[Explanation of symbols]

 1 ... Metal curved tube 2 ... Synthetic resin coating layer 3 ... Ceramic lining layer

Claims (1)

[Scope of utility model registration request] 1. A metal curved pipe, a synthetic resin coating layer having a high chemical resistance for covering the inner peripheral surface thereof, and a ceramic lining layer covering the inner peripheral surface of the synthetic resin coating layer. Curved tube with ceramic lining.