CN218903372U

CN218903372U - Expansion head for extrusion expansion groove pipe

Info

Publication number: CN218903372U
Application number: CN202223537474.9U
Authority: CN
Inventors: 张仕伟; 刘杭; 汤勇; 姚旋刚; 叶建国
Original assignee: Foshan Teraway Heat Exchanger Manufacturing Co ltd
Current assignee: Foshan Teraway Heat Exchanger Manufacturing Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-04-25
Anticipated expiration: 2032-12-29

Abstract

The utility model relates to an extrusion expansion groove pipe expansion head, which comprises an extrusion expansion part and a connecting part; the extruding and expanding part is in a shape of a circular table, and a plurality of extruding and expanding teeth which are uniformly distributed at intervals are arranged on the surface of the side wall of the circular table; the extrusion and expansion teeth extend from the upper bottom of the circular table to the lower bottom of the circular table, and the extrusion and expansion teeth and the axis of the circular table are positioned on the same plane; the diameter of the upper bottom of the circular table is smaller than the inner diameter of the groove pipe, and the diameter of the lower bottom of the circular table is larger than the inner diameter of the groove pipe; the connecting portion and the extrusion expansion portion are coaxially arranged, one end of the connecting portion is used for being connected to the expansion rod, and the other end of the connecting portion is connected to the lower bottom of the round table of the extrusion expansion portion. The extrusion teeth are in contact with the inner wall of the metal light pipe and are extruded and expanded, a plurality of grooves which are distributed at intervals are extruded and expanded in the inner wall of the metal light pipe, a plurality of spike structures which are spliced in sequence are formed among the grooves which are formed finally, and the spike structures form micro-nano structures which can improve the phase change efficiency of working media, so that the performance of the heat pipe heat exchanger can be effectively improved.

Description

Expansion head for extrusion expansion groove pipe

Technical Field

The utility model belongs to the technical field of processing of metal inner grooved pipes, and particularly relates to an extrusion expansion grooved pipe expansion head.

Background

The industrial waste heat refers to heat released by waste heat, waste water, waste gas and other heat carriers discharged by heat energy conversion equipment or energy utilization equipment in the production process of the industrial and mining industry, and belongs to low-grade energy sources. In the production process of traditional high-energy industries such as coal, petroleum, steel, chemical industry, machinery and the like, a large amount of industrial waste heat is generated, and the waste heat is regarded as 5 th most conventional energy source except coal, petroleum, natural gas and hydraulic power. The waste heat recovery potential of China to be discovered is huge.

In the field of waste heat recovery, a heat pipe heat exchanger is often needed, but most of heat exchange pipes used by the heat pipe heat exchanger are light pipes, the heat exchange area is small, the performance is poor, the heat exchange area is obviously increased by a groove pipe, and the micro-nano structure among grooves is beneficial to phase change of working media, so that the heat pipe heat exchanger has great help in improving the performance of the heat pipe heat exchanger.

The prior art discloses a slot pipe processingequipment, including move about the core and with move about the core cooperation be used for drawing the external mold of tubular product, move about the core have first end and the second end of drawing, first end diameter of drawing is less than the second end of drawing, first end of drawing with be the round platform between the second end of drawing, be equipped with on the round platform along circumference interval distribution and extend to the recess on the first end of drawing. The movable core head plays a role of an inner die, is matched with the outer die, can draw the pipe, forms a groove in the inner wall of the pipe in the drawing process, can become a groove pipe after one-time drawing, and reduces the processing time.

The technical problems are as follows: the floating core head needs to be matched with the outer die for use, the processing process is also subjected to diameter reduction treatment, the working procedure is complicated, a micro-nano structure cannot be processed between grooves, and the phase change efficiency of working media and the performance of the heat pipe heat exchanger are difficult to further improve.

Disclosure of Invention

Aiming at the technical problems existing in the prior art, the utility model aims at: the expansion head of the extrusion expansion grooved pipe is capable of extruding and expanding the grooved pipe once, and a micro-nano structure is processed between grooves, so that the working medium phase change efficiency is improved, and the performance of the heat pipe heat exchanger is improved.

The utility model aims at realizing the following technical scheme:

an extrusion expansion groove pipe expansion head comprises an extrusion expansion part and a connecting part;

the extruding and expanding part is in a shape of a circular table, and a plurality of extruding and expanding teeth which are uniformly distributed at intervals are arranged on the surface of the side wall of the circular table;

the extrusion and expansion teeth extend from the upper bottom of the circular table to the lower bottom of the circular table, and the extrusion and expansion teeth and the axis of the circular table are positioned on the same plane;

the diameter of the upper bottom of the circular table is smaller than the inner diameter of the groove pipe, and the diameter of the lower bottom of the circular table is larger than the inner diameter of the groove pipe;

the connecting portion and the extrusion expansion portion are coaxially arranged, one end of the connecting portion is used for being connected to the expansion rod, and the other end of the connecting portion is connected to the lower bottom of the round table of the extrusion expansion portion.

Further, the front end of the extrusion expansion part is provided with a frustum-shaped guide part, and the guide part is connected to the upper bottom of the round table and is coaxially arranged with the extrusion expansion part.

Further, an included angle of 30-60 degrees is formed between the side wall of the guide part and the axis of the extrusion expansion part.

Further, the difference between the diameter of the lower bottom of the circular table and the inner diameter of the grooved pipe is 0.1-0.3mm.

Further, the number of the extrusion teeth is 30-180.

Further, the height of the extrusion expansion teeth is 0.1-0.2mm.

Further, the extrusion-expansion teeth are provided with arc-shaped tooth tops, and the included angle of the arc-shaped tooth tops is 20-40 degrees.

Further, the bulge is made of chrome tungsten manganese steel, 440c or 4cr 13.

Further, the connecting portion is in threaded connection with the bulge portion.

A method for processing a grooved pipe adopts an extrusion expansion groove pipe expansion head, which comprises the following steps,

the metal light pipe to be processed is fixed to be coincided with the axis of the expansion rod, the expansion head is installed on the expansion rod through the connecting part, the expansion head is driven by the expansion rod to do relative linear motion in the metal light pipe, along with continuous feeding of the expansion rod, the extrusion teeth are in contact with the inner wall of the metal light pipe and are extruded and expanded, a plurality of grooves which are distributed at intervals are extruded and expanded in the inner wall of the metal light pipe at intervals, and a plurality of spike structures which are spliced in sequence are formed among the grooves.

Compared with the prior art, the utility model has the following beneficial effects:

when in work, the metal light pipe to be added is fixed to be coincided with the axis of the expansion rod. The expansion head is arranged on the expansion rod through the connecting part, the tube expander is started, and the expansion rod and the metal light tube are pushed to move relatively. Because the extrusion part of the expansion head is in a round table shape, a plurality of extrusion teeth which are uniformly distributed at intervals are arranged on the surface of the side wall of the round table, the diameter of the upper bottom of the round table is smaller than the inner diameter of the grooved pipe, the diameter of the lower bottom of the round table is larger than the inner diameter of the grooved pipe, along with continuous feeding of the expansion rod, the extrusion teeth start to contact with the inner wall of the metal light pipe and are extruded and expanded, a plurality of grooves which are distributed at intervals are extruded and expanded in the inner wall of the metal light pipe, and the axis of the grooves is parallel to the axis of the expansion head. Because the extrusion of adjacent extrusion teeth is carried out, and the metal light pipe is not limited by an outer die, a plurality of spike structures spliced in sequence can be formed between the finally formed grooves, and the spike structures form micro-nano structures capable of improving the phase change efficiency of working media, so that the performance of the heat pipe heat exchanger can be effectively improved.

Drawings

FIG. 1 is a schematic diagram of an expansion head of an expansion grooved pipe.

Fig. 2 is a schematic structural view of an expansion tooth of an expansion groove pipe expansion head.

Fig. 3 is a schematic structural view of the bulge and the guide.

Fig. 4 is a schematic structural view of a connection portion of an expansion head of an expansion groove pipe.

Fig. 5 is a schematic structural view of a processed and formed trench tube spike structure.

Fig. 6 is a schematic diagram of the process of expanding a pipe.

In the figure:

1-guiding part, 2-bulge part, 3-connecting part, 4-bulge tooth, 5-internal thread, 6-tooth side wall, 7-arc tooth top, 8-groove, 9-spike structure and 10-metal light pipe.

Detailed Description

The present utility model is described in further detail below.

As shown in fig. 1-5, an expansion groove pipe expansion head comprises a guide part 1, an expansion part 2 and a connecting part 3, wherein a plurality of rows of expansion teeth 4 are uniformly distributed on the expansion part 2, and the connecting part 3 of the expansion head is connected with an expansion rod through an internal thread 5 to provide expansion acting force for the expansion head.

Further, the guiding portion 1 of the expansion head is in a frustum shape, so as to ensure that the expansion head can smoothly enter the metal light pipe 10, and simultaneously, centripetal positioning is provided, and an included angle is formed between the side wall of the frustum and the axis of the expansion head, and the angle is preferably 60 degrees.

Further, the diameter of the lower bottom of the round table of the extruding and expanding part 2 of the expansion head is equal to the inner diameter of the metal light pipe 10 to be processed, and can be slightly larger than the inner diameter of the metal light pipe 10 to realize the effect of expanding the pipe, and the expansion allowance is preferably 0.2mm.

Further, a plurality of extrusion teeth 4 of the expansion head are uniformly distributed on the surface of the side wall of the round table of the extrusion part 2, each extrusion tooth 4 is in the same plane with the axis of the expansion head, and the number of the extrusion teeth 4 is preferably 90.

Further, the height of the extrusion and expansion tooth 4 of the expansion head is preferably 0.15mm, the structure of the extrusion and expansion tooth 4 comprises a tooth side wall 6 and an arc-shaped tooth top 7, an included angle between the tooth side wall 6 and a symmetry axis of the extrusion and expansion tooth 4 is preferably 30 degrees, an included angle between the arc-shaped tooth top 7 is preferably 30 degrees, and a main stressed part is the arc-shaped tooth top 7 during processing.

Further, the connection portion 3 of the expansion head is provided with an internal thread 5 for connection to the expansion rod to obtain the extrusion expansion thrust, the length of the internal thread 5 being preferably 10mm to ensure that the expansion head is concentric with the expansion rod.

Furthermore, the hardness and wear resistance requirements of the material of the guide part 1 and the extrusion part 2 of the expansion head are high, and chromium-tungsten-manganese steel is preferable. The material of the connecting portion 3 is low and high-speed steel is sufficient. The two are welded together.

Further, the expansion head is processed by wire cutting, the surface precision of the expansion part 2 and the guiding part 1 is preferably Ra0.25, and the surface precision of the connecting part 3 is Ra3.2.

Further, a plurality of spike structures 9 are formed on two sides of the extruded and expanded groove 8, and when the groove 8 is used in the heat exchange field, the micro-nano structure formed by the spike structures 9 is helpful for enhancing the heat exchange capacity.

As shown in fig. 6, a method for processing a grooved pipe, which adopts an extrusion-expansion grooved pipe expansion head, comprises the following steps,

the metal light pipe 10 to be processed is fixed to be coincided with the axis of the expansion rod, the expansion head is installed on the expansion rod through the connecting part 3, the expansion head is driven by the expansion rod to do relative linear motion in the metal light pipe 10, along with continuous feeding of the expansion rod, the extrusion teeth 4 are in contact with the inner wall of the metal light pipe 10 and extrusion expansion occurs, a plurality of grooves 8 which are distributed at intervals are extruded in the inner wall of the metal light pipe 10 by the extrusion teeth 4 which are distributed at intervals uniformly, and a plurality of spike structures 9 which are spliced in sequence are formed among the grooves 8.

Taking a copper light pipe processing example, the method specifically comprises the following steps:

(1) And cutting out the copper light tube to be processed, and straightening and cleaning the copper light tube.

(2) Reaming is carried out on one end of the copper light pipe so as to facilitate the entering of the expansion head and avoid the collision with the pipe wall, thereby causing the damage of the expansion head and the pipe fitting.

(3) And fixing the copper light tube to ensure that the copper light tube coincides with the axis of the expansion rod.

(4) The expansion head is arranged on the expansion rod in a threaded fastening way.

(5) And (5) coating lubricating oil.

(6) Starting the tube expander, pushing the expansion rod and the light tube to make relative motion, observing the working state, extruding and expanding the grooves 8, and forming a plurality of spike structures 9 between the grooves 8 to obtain the processed copper groove 8 tube.

By adopting the processing method, no external mold is required to be additionally arranged, the processing process does not need to be subjected to diameter reduction treatment, the extrusion molding can be directly carried out once, the working procedure is simple and convenient, the micro-nano structure can be processed between the grooves 8, the phase change efficiency of working media in the grooves 8 is effectively improved, and the performance of the heat pipe heat exchanger is improved.

The above examples are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present utility model should be made in the equivalent manner, and the embodiments are included in the protection scope of the present utility model.

Claims

1. An extrusion expansion groove pipe expansion head is characterized in that: comprises an extrusion expansion part and a connecting part;

2. An expansion joint for an extruded grooved pipe as claimed in claim 1, wherein: the front end of the extrusion expansion part is provided with a frustum-shaped guiding part which is connected with the upper bottom of the round table and is coaxially arranged with the extrusion expansion part.

3. An expansion joint for an extruded grooved pipe as claimed in claim 2, wherein: an included angle of 30-60 degrees is formed between the side wall of the guide part and the axis of the extrusion expansion part.

4. An expansion joint for an extruded grooved pipe as claimed in claim 1, wherein: the difference between the diameter of the lower bottom of the circular table and the inner diameter of the grooved pipe is 0.1-0.3mm.

5. An expansion joint for an extruded grooved pipe as claimed in claim 1, wherein: the number of the extrusion teeth is 30-180.

6. An expansion joint for an extruded grooved pipe as claimed in claim 1, wherein: the height of the extrusion expansion teeth is 0.1-0.2mm.

7. An expansion joint for an extruded grooved pipe as claimed in claim 1, wherein: the extrusion tooth is provided with an arc tooth top, and the included angle of the arc tooth top is 20-40 degrees.

8. An expansion joint for an extruded grooved pipe as claimed in claim 1, wherein: the bulge is made of chrome tungsten manganese steel, 440c or 4cr 13.

9. An expansion joint for an extruded grooved pipe as claimed in claim 1, wherein: the connecting part is in threaded connection with the extrusion part.