CN2379680Y

CN2379680Y - Spiral corrugated pipe

Info

Publication number: CN2379680Y
Application number: CN 99216142
Authority: CN
Inventors: 左学禹
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-18
Filing date: 1999-07-18
Publication date: 2000-05-24
Anticipated expiration: 2009-07-18

Abstract

The utility model relates to a spiral corrugated pipe, which uses a direct light pipe which is processes by pressure to generate plastic deformation, and then forms a section pipe with a spiral groove. The spiral corrugated pipe is characterized in that a center line of the spiral groove is a spiral line which is the same coaxial line of the spiral corrugated pipe. The section contour of a spiral corrugated pipe wall is symmetrical non circular curves. The sectional areas of a cavity of the spiral corrugated pipe are equal everywhere. The spiral corrugated pipe can be made by rolling, drawing, etc. methods. A heat exchanger using the spiral corrugated pipe has the advantages of high thermal efficiency, high reliability, long service life, etc. The spiral corrugated pipe can be used in the technical field of electric power, petroleum, chemical industry, heating, etc.

Description

A kind of spiral tube

The utility model relates to a kind of spiral tube, belongs to extraordinary section bar technical field.

Usually mostly the used tubing of heat exchanger is straight collimator or U type light pipe.The heat exchanger of this structure, heat exchange efficiency is lower.In recent years use more circular section corrugated tube heat exchanger, heat exchange efficiency is significantly improved than conventional heat exchanger.The part but it also comes with some shortcomings, for example: circular section corrugated tube manufacturing process is complicated, and productivity is lower; Flowing medium flow resistance in pipe is bigger, and speed is inhomogeneous etc.

The purpose of this utility model provides a kind of spiral tube.Flowing medium flow resistance in this corrugated tube is less, and speed is even.This corrugated tube manufacturing process is simpler, and productivity is higher.This spiral tube can be applied to the various heat-exchange apparatus in fields such as electric power, chemical industry, heating.

The purpose of this utility model is achieved in that direct light tubing after pressure processing produces plastic deformation, forms the special section tubular product that has spiral groove.The center line of spiral groove is the helix with the spiral tube coaxial line.The Normal section profile of spiral groove is a circular curve.The cross section profile of spiral tube wall is the non-circular curve of symmetry.The intracavity section of spiral tube is long-pending to be equated everywhere.As required, a number of spiral groove can be double end, three or four-head.The two ends of spiral tube can keep one section crude direct light pipeline section.

The utility model compared with prior art has the following advantages:

1, because the spiral tube intracavity section is long-pending to be equated everywhere, flowing medium can not produce disturbance when flowing therein, thereby it is compared with the circular section corrugated tube, and the suffered resistance of flowing medium is less, and flow velocity is even.

2, the sectional area ratio same specification straight collimator of spiral tube is little, under same traffic, spiral tube medium flow velocity is than straight collimator medium flow velocity height, and the surface area of the surface area ratio same specification straight collimator of spiral tube is big in addition, thereby its heat exchange efficiency is than straight collimator height.

When 3, flowing in spiral tube because of flowing medium, the flowing medium that flows along tube wall enters the spiral motion state thereupon.Be subjected to action of centrifugal force, press close to the fluid medium pressure of tube wall, the fluid medium pressure near tube's axis is high.When being in certain, flowing medium faces Jie's state and when having gas to separate out, this gas will be separated out along tube's axis.This damages favourable to the cavitation erosion that alleviates tube wall.Thereby, will be higher than straight collimator and circular section corrugated tube the working life of spiral tube.

4, the two ends of spiral tube keep one section crude direct light pipeline section, be convenient to it with tube sheet be connected and tube and tube between welding.

5, spiral tube has bigger latitude, when difference variation is big, is unlikely that because of expanding with heat and contract with cold its two ends are torn with the weld seam that the heat exchanger tube sheet is connected.

Concrete structure of the present utility model and manufacturing process are provided by following embodiment and accompanying drawing thereof.

Fig. 1 is the schematic representation according to the spiral tube that the utility model proposes.

Fig. 2 is a spiral tube rolling mill practice schematic representation.

Fig. 3 is that the K of Fig. 2 is to view.

Fig. 4 is a spiral tube drawing process schematic representation.

Below in conjunction with details and the manufacturing process of accompanying drawing detailed description according to the concrete structure that the utility model proposes.

Spiral tube is formed by three sections, two ends direct light pipeline section a and b and middle spiral waveform pipeline section L.Each segment length is determined by the thermal converter structure that adopts spiral tube.The helix angle of spiral tube groove is advisable between 80 ° at 20 °.The degree of depth of spiral tube groove is that 10% to 40% of caliber is advisable.The material of spiral tube according to designing requirement, can adopt carbon steel, alloyed steel, titanium alloy, non-ferrous metal and stainless steel.

The manufacturing of spiral tube can be adopted following two kinds of technologies: a kind of is rolling, and another kind is a drawing.

3. and 4. the equipment of rolling spiral tube reach two niprolls by two rolls at least and 5. and 6. form.Roll 3. and axis 4. and pipe 1. be helix angle ∮ with the space angle of spiral tube axis 2., but its direction is opposite.The roll 3. and 4. space angle of axis is 2 ∮.Roll 3. and 4. with the pipe 1. line and the pipe intersect vertical axis 1. of point of action.Roll 3. and working surface 4. be arc rotary surface.Roll 3. with 4. can along its with pipe 1. the line of point of action move relative to equidistant.5. and axis 6. and pipe axis normal 1. niproll.Niproll 5. and 6. with the pipe 1. line and the pipe intersect vertical axis 1. of point of action, simultaneously also with roll 3. and the line of point of action 4. intersect vertically.5. niproll is turning surface with the pipe circular arc line that 1. radius is identical with 6. working surface.3. and 4. roll drives its rotation by power plant, turn to identical, and with 1. switched in opposite of pipe.Niproll is 5. with 6. by pipe driven rotary, switched in opposite.Roll 3. and space angle 4. and relative position all can adjust, thereby can roll out the spiral tube of different helix angles and different depth spiral grooves.The equipment of rolling spiral tube also can adopt three rollers and four high stand.The roll of these two kinds of milling trains is symmetric arrangement, and can save niproll.The spiral tube that two-roller mill shuts out is the twin-feed spiral groove.What three-high mill shut out is three spiral chutes.What four high stand shut out is the four-start spiral groove.

The equipment that draws spiral tube at least 9. and 10. by roll, a pair of niproll (15), the unit head (12) and the guide rail (13) that have rotatable chuck (11) are formed.9. and 10. roll is parallel axes, and with pipe axis normal 7., its rotation is driven by pipe.Other characteristics of roll and niproll are identical with rolling equipment.Rotatable collet (11) clamps an end of pipe.Flat for preventing from tube wall is pressed from both sides, insert a chock that matches with pipe orifice (15) at pipe end.After treating that drawing is finished, will have this section of chock tube head and cut away.The straight line motion of the rotation of chuck (11) and unit head (12) has synchronized relation.Gear shift by unit head can be adjusted this synchronized relation, thus draw out have different helix angles spiral tube 8..The pipe axis is parallel with guide rail (13).Unit head (12) moves along guide rail (13).It can be driven by leading screw or hydraulic jack.

Drawing device also can adopt three rolls and four roll structures.Three rolls and the equal symmetric arrangement of four rolls, and can save niproll, the axis of roll all with the pipe axis normal.

Claims

1, spiral tube is to use direct light tubing after pressure processing produces plastic deformation, formation has the heterotype tubing of spiral groove, it is characterized in that: the center line of spiral groove is the helix with the spiral tube coaxial line, its helix angle is between 20 ° to 80 °, the Normal section profile of spiral groove is a circular curve, the degree of depth of spiral groove is 10% to 40% of a caliber, the cross section profile of spiral tube wall is the non-circular curve of symmetry, the intracavity section of spiral tube is long-pending to be equated everywhere, as required, a number of spiral groove can be a double end, three and four-head, the two ends of spiral tube can keep one section crude direct light pipeline section a and b.

2, spiral tube according to claim 1, its material can adopt carbon steel, alloyed steel, titanium alloy, non-ferrous metal and stainless steel.