CN2637868Y

CN2637868Y - Insulating flange joint

Info

Publication number: CN2637868Y
Application number: CN 03255746
Authority: CN
Inventors: 朱元庆
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-07-18
Filing date: 2003-07-18
Publication date: 2004-09-01
Anticipated expiration: 2013-07-18

Abstract

An insulating flange joint comprises a steel flange tube of a revolving body. The high neck flanges are positioned at the two ends of the steel flange tube. The outer surface of a tube body is covered by a plastic protective insulating layer and PE, PP or PVC can be adopted by the plastic materials. The thickness range of the plastic protective insulating layer is 0.05 mm to 3 mm. During actual installation, a plastic insulating flange with a steel core is only connected with a flange at the ends of a steel tube that needs to be insulated by connecting bolts and nuts. The insulating flange joint that adopts the utility model has the advantages that: no welding is needed during on-site construction and installation and no on-site protective insulation is needed, the construction and installation is convenient; the price is low based on industrialized production; multiple pressure grades can be applied; the insulation function is reliable, the maintenance is convenient and the structural size is short.

Description

The insulated flange joint

Technical field

The utility model relates to the parts that are applied to the steel pipe corrosion-proof erosion, especially refers to be applicable to the etch-proof parts of liquid, gas delivery steel pipe.

Background technique

The steel pipe that oil and industrial long-distance transport pipes and gas, draining and chemical pipeline are adopted, for prolonging steel pipe working life, it is coated all to need insulate to steel pipe, and adopts the cathode protection technology of impressed current or sacrificial anode, and the protection steel pipe is not corroded.For reducing the loss of cathodic protection current, insulating joint all must be installed in all places that might cause the loss of steel pipe cathodic protection current, guarantees not loss without reason of cathodic protection current.The insulating joint device that generally adopts both at home and abroad at present and produce has two kinds: flange insulating joint structure as shown in Figure 1, comprises hubbed flange 11, dead ring 12, insulating bush 13, pad 14 and bolt 15; Pipe joint type insulating joint structure as shown in Figure 2, comprises upper conduit 21, downcomer 22, sleeve 23, insulating sleeve 24, dead ring 25, rubber seal 26 and insulating corrosion coating 27.

There is following shortcoming in above-mentioned two kinds of insulating joint devices:

1, flange-type insulating joint: (1) physical dimension is big; (2) site operation need weld, and needs the scene to protect insulation to the surface, the construction trouble, and on-the-spot insulating protection is unreliable; (3) product structure complexity, the price height; (4) Jue Yuan reliability is relatively poor.

2, pipe joint type insulating joint: (1) structure is longer, installs inconvenient on equipment such as pressure regulating cabinet; (2) site operation need weld, and outer surface must protect insulation in the scene, the construction trouble, and on-the-spot insulating protection is unreliable; (3), the product processing technique complexity, produce difficulty in batches, the price height; (4), joint leaks, can't keep in repair.

Summary of the invention

The purpose of this utility model is to provide a kind of New-type Insulated Flange joint, overcomes the above-mentioned shortcoming of existing product.

For achieving the above object, solution of the present utility model is:

A kind of insulated flange joint comprises solid of rotation steel flanged pipe, and its two ends are provided with hubbed flange, and outer surface of tube body is coated with plastics protection isolation layer.This plastic materials is selected PE or PP or PVC for use.The thickness range of this plastics protection isolation layer is from 0.05 millimeter to 3 millimeters.

Owing to adopted such scheme, insulated flange joint of the present utility model has the following advantages:

1, site operation is installed and need not be welded, and insulation is protected at the scene of noting be used in, construction install convenience;

2, Product industrialization production, low price;

3, product can be used multiple pressure rank;

4, insulation is reliable, easy to maintenance.

5, physical dimension is short.

Description of drawings

Fig. 1 is existing flange insulating joint structural representation

Fig. 2 is existing pipe joint type insulating joint structural representation

Fig. 3 is an insulated flange joint structure schematic representation of the present utility model

Embodiment

See also Fig. 3, structure of the present utility model is: comprise the two flange short tubes 31 of solid of rotation steel, its two ends are provided with hubbed flange 35, its outer surface coating plastic protection isolation layer 32, and plastic materials can be selected PE, PP, PVC etc. for use; The thickness of plastics protection isolation layer 32 requires to determine that its thickness range is from 0.05 millimeter to 3 millimeters according to insulation class.

When as installed, as long as this plastics steel core insulated flange is connected with the flange of nut with the steel tube end part that needs insulation by connecting bolt.

With the combustion gas pressure regulating cabinet is example: generally all insulating joint need be installed on the in-and-out pipe of combustion gas pressure regulating cabinet, the insulating joint that adopts is Fig. 1 or structure shown in Figure 2 at present, now adopt structure of the present utility model, the two flange short tubes of 30 centimeter length steel, the PE plastics that cover 1 millimeters thick with injection moulding outward protect isolation layer.The PE steel core insulated flange of making can substitute former insulating joint.

With the underground gas pipeline is example: underground gas pipeline valve both sides generally all should be provided with insulating joint, adopt the two flange short tubes of steel of 25 centimeter length, cover the PVC plastics protection isolation layer of 1.5 millimeters thick outward with the method for blade coating.The PVC steel core insulated flange of making can substitute former insulating joint.

Claims

1, a kind of insulated flange joint comprises solid of rotation steel flanged pipe, and it is characterized in that: its two ends are provided with hubbed flange, and outer surface of tube body is coated with plastics protection isolation layer.

2, insulated flange joint according to claim 1 is characterized in that: this plastic materials is selected PE or PP or PVC for use.

3, insulated flange joint according to claim 1 is characterized in that: the thickness range of this plastics protection isolation layer is from 0.05 millimeter to 3 millimeters.