CN209278703U - Straight pipe and bent pipe for manufacturing bent pipe - Google Patents

Abstract

The utility model provides a straight tube and return bend for making return bend belongs to return bend technical field. The pipe wall of the straight pipe is provided with a first side and a second side opposite to the first side, and the straight pipe comprises a first section, a second section and a third section which are sequentially connected. The pipe wall thickness of the first section and the pipe wall thickness of the third section are uniform, and the pipe wall thickness of the first side of the second section is larger than that of the second side of the second section. And bending the second section of the straight pipe along the direction from the first side to the second side to form a bent pipe. After the straight pipe is formed into the bent pipe, the situation that the stretching surface of the bent pipe is too thin and the compression surface of the bent pipe is too thick is avoided, and the quality of the bent pipe is improved.

Description

A straight and bent pipe for making bent pipes

technical field

The utility model relates to the technical field of bent pipes, in particular to a straight pipe and a bent pipe used for manufacturing bent pipes.

Background technique

The existing pipe bending technology usually uses a straight pipe to manufacture, and the straight pipe is bent to form a pipe bend.

The pipes in the prior art are all concentric straight pipes. After the straight pipe is bent, the tensile surface of the elbow, that is, the thickness of the outer surface of the elbow, is thinned, and the compression surface of the elbow, that is, the inner surface of the elbow, is thickened. And the amount of thickening is greater than the amount of thinning, which is not conducive to the production and use of elbows.

Utility model content

The first purpose of the present utility model is to provide a straight pipe for making bent pipes. Using this straight pipe to make bent pipes can prevent the stretching surface of the bent pipe from being too thin and the compression surface of the bent pipe from being too thick. the quality of.

The second purpose of the utility model is to provide an elbow, which is obtained by using the above-mentioned straight pipe, which can prevent the stretching surface of the elbow from being too thin and the compression surface of the elbow from being too thick, so as to improve the quality of the elbow.

Based on the above-mentioned first purpose, the utility model is realized by adopting the following technical solutions:

A straight pipe, the pipe wall of the straight pipe has a first side and a second side opposite to the first side, and the straight pipe includes a first section, a second section and a third section connected in sequence;

The tube wall thickness of the first section and the tube wall of the third section are uniform, and the tube wall thickness of the first side of the second section is greater than the tube wall thickness of the second side of the second section.

Further, in an optional embodiment of the present invention, the thickness of the pipe wall on the second side of the second section is consistent with the thickness of the pipe wall of the first section.

Further, in an optional embodiment of the present utility model, an end of the first side of the first section close to the first side of the second section forms a first transition portion, and the slope ratio of the first transition portion is 1:(20 -30); the end of the first side of the third section close to the first side of the second section forms a second transition portion, and the slope ratio of the second transition portion is 1:(20-30).

Further, in an optional embodiment of the present invention, the thickness of the tube wall on the second side of the second section increases gradually to the thickness of the tube wall on the first side of the second section.

Further, in an optional embodiment of the present utility model, the difference between the thickness of the pipe wall on the first side of the second section and the thickness of the pipe wall on the second side of the second section is 4-8mm.

Further, in an optional embodiment of the present invention, the difference between the thickness of the pipe wall on the first side of the second section and the thickness of the pipe wall on the second side of the second section is 6 mm.

Based on the above-mentioned second purpose, the utility model is realized by adopting the following technical solutions:

A bent pipe is formed by bending the second section of the straight pipe along the direction from the first side to the second side.

Further, in an optional embodiment of the present invention, the thickness of the pipe wall on the first side of the second section is consistent with the thickness of the pipe wall on the second side of the second section.

Further, in an optional embodiment of the present utility model, the central angle of the above-mentioned elbow is 80°-100°.

Further, in an optional embodiment of the present utility model, the central angle of the above-mentioned elbow is 90°.

Compared with the prior art, the beneficial effects of the straight pipes and bent pipes used to manufacture bent pipes provided by the embodiments of the present invention include:

The first section and the third section of the straight pipe are consistent with the ordinary pipeline, which are concentric pipes with the same pipe wall thickness. Only the pipe wall thickness of the first side of the second section is greater than the pipe wall thickness of the second side. When the pipe is formed into an elbow, bend the second section of the straight pipe along the direction from the first side to the second side. When forming an elbow, the first side is the outer side of the elbow, and the second side is the inner side of the elbow Side, the outer side of the elbow is stretched, and the inner side of the elbow is compressed. Since the wall thickness of the first side is greater than that of the second side, the first side of the straight pipe is bent toward the second side, Therefore, the first side is the tension surface, and the second side is the compression surface. After bending, the thickness of the first side decreases, and the thickness of the second side increases, that is, the thickness of the tension surface decreases, and the thickness of the compression surface increases. , so that the thickness of the tension surface and the compression surface are closer, avoiding the tension surface of the elbow being too thin, and the compression surface of the elbow being too thick, and improving the quality of the elbow.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings will be briefly introduced in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation on the scope. For those of ordinary skill in the art, on the premise of not paying creative work, other related drawings can also be obtained according to these drawings, which also belong to the protection scope of the present utility model .

Fig. 1 is the structural representation of the straight pipe that is used to manufacture bent pipe that the utility model embodiment provides;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is a CC sectional view of Fig. 1;

Fig. 4 is the BB sectional view of Fig. 1;

Fig. 5 is a schematic structural view of the bent pipe provided by the embodiment of the present invention.

Icons: 110 - first side; 120 - second side; 130 - first section; 140 - second section; 150 - third section; 141 - inner side; 142 - outer side; 111 - first transition; 131 - Second transition part.

Detailed ways

The pipes in the prior art are all concentric straight pipes. After the straight pipe is bent, the tensile surface of the elbow, that is, the thickness of the outer surface of the elbow, is thinned, and the compression surface of the elbow, that is, the inner surface of the elbow, is thickened. And the amount of thickening is greater than the amount of thinning, especially the thickening of the compression surface of the pipe with small diameter is particularly obvious, which is not conducive to the production and use of the elbow.

From the perspective of pipeline design, the thickening of the compression surface is not necessary. Excessive thickening will also have a certain impact on the pipeline system. At the same time, the thinning of the tension surface will also make the quality of the pipeline poor. Can not meet the needs of the pipeline system.

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the utility model, it should be noted that the orientation or positional relationship indicated by "inside" and "outside" are based on the orientation or positional relationship shown in the attached drawings, or the conventional placement of the utility model product during use. The orientation or positional relationship is only for the convenience of describing the utility model and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a reference to the utility model. limits. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should also be noted that, unless otherwise clearly stipulated and limited, the terms "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or an integral connection; Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

Example

Fig. 1 is a schematic structural view of a straight pipe used for manufacturing a bent pipe provided in this embodiment. Please refer to Fig. 1, in the present embodiment, be used for making the straight pipe of bent pipe, the pipe wall of straight pipe has first side 110 and the second side 120 opposite with first side 110, straight pipe comprises the first segment 130 , second segment 140 and third segment 150 .

FIG. 2 is a sectional view of AA in FIG. 1 , and FIG. 3 is a sectional view of CC in FIG. 1 . Please refer to Fig. 2 and Fig. 3, in this embodiment, the pipe wall thickness a of the first section 130 and the third section 150 is uniform, and the first section 130 and the third section 150 of the straight pipe are consistent with common pipelines , is a concentric pipe, and the thickness of the pipe wall a is the same. When the bent pipe is manufactured, the pipes of the first section 130 and the third section 150 will not be bent, and are still in the shape of a straight pipe.

FIG. 4 is a sectional view along line BB of FIG. 1 , and FIG. 5 is a schematic structural diagram of an elbow provided in this embodiment. Please refer to Fig. 4 and Fig. 5, in the present embodiment, the pipe wall thickness b of the first side 110 of the second section 140 is greater than the pipe wall thickness a of the second side 120, and the bent pipe is the second section 140 of the straight pipe along the The first side 110 is bent toward the second side 120 . The manufacturing method of the bent pipe is to bend the second section 140 of the straight pipe along the direction from the first side 110 to the second side 120 to form the bent pipe.

When forming the straight pipe into an elbow, the second section 140 of the straight pipe is bent along the direction from the first side 110 to the second side 120. When forming an elbow, the first side 110 is the outer surface 142 of the elbow. The second side 120 is the inner surface 141 of the elbow, the outer surface 142 of the elbow is stretched, and the inner surface 141 of the elbow is compressed. Since the wall thickness b of the first side 110 is greater than the wall thickness a of the second side 120, The first side 110 of the straight pipe is bent toward the second side 120, so the first side 110 is a tension surface, and the second side 120 is a compression surface. After bending, the thickness of the first side 110 decreases, The thickness of the second side 120 is increased, that is, the thickness of the tension surface is reduced, and the thickness of the compression surface is increased, so that the thickness of the tension surface and the compression surface are closer, so as to avoid the tension surface of the elbow being too thin and the compression of the elbow. If the surface is too thick, the quality of the bend can be improved and the service life of the bend can be prolonged.

Optionally, please continue to refer to FIGS. 2-4 , the thickness a of the tube wall of the second side 120 of the second segment 140 is consistent with the thickness a of the tube wall of the first segment 130 . Since the second side 120 is not stretched but compressed when the second section 140 is bent, the thickness a of the second side 120 is different from the thickness a of the second side 120 of the first section 130 and the thickness a of the third side. The thickness a of the second side 120 of the section 150 is consistent, which is beneficial to the manufacture of the straight pipe, and after the bent pipe is manufactured, the compression surface is compressed within a certain range, and the quality of the bent pipe is better.

Please continue to refer to FIG. 1 , in this embodiment, an end of the first side 110 of the first segment 130 close to the first side 110 of the second segment 140 forms a first transition portion 111 , and the slope ratio of the first transition portion 111 is 1. : (20-30); the end of the first side 110 of the third section 150 close to the first side 110 of the second section 140 forms a second transition portion 131, and the slope ratio of the second transition portion 131 is 1:( 20-30).

The position of the first section 130 close to the second section 140 forms a first transition portion 111, the first transition portion 111 is an upward slope, and the first side 110 of the first section 130 becomes thicker gradually, from the second section 140 to the third section 150 forms a second transition portion 131 near the second section 140, the first side 110 of the third section 150 close to the second section 140 gradually becomes thinner, and the second transition portion 131 is a downward slope, which makes the straight pipe stronger. High, without forming a significant diameter change. At the same time, the quality of the obtained bent pipe is better, which meets the requirements of the pipeline system.

Optionally, the thickness a of the tube wall of the second side 120 of the second segment 140 gradually increases to the thickness b of the tube wall of the first side 110 of the second segment 140 . Make the inner wall of the second section 140 and the outer wall of the second section 140 form two circles, and the radius of the circle of the outer wall is greater than the radius of the circle of the inner wall, and the center of the circle of the circle of the outer wall is toward the first side 110 relative to the center of the circle of the inner wall. The direction is deviated so that an eccentric circle structure is formed between the inner wall and the outer wall of the second section 140 .

Optionally, please continue to refer to FIG. 4 , the difference between the tube wall thickness b of the first side 110 of the second segment 140 and the tube wall thickness a of the second side 120 of the second segment 140 is 4-8 mm. Further, the difference between the tube wall thickness b of the first side 110 of the second segment 140 and the tube wall thickness a of the second side 120 of the second segment 140 is 6 mm.

After the straight pipe is formed into a bend, the difference between the thickness of the tensile surface of the bend and the thickness of the compression surface of the bend is smaller, so that the thickness of the second section 140 of the bend is more uniform, and the quality of the bend is better. Meet the needs of the piping system.

Optionally, the central angle α of the elbow is 80°-100°. Further, the central angle α of the elbow is 90°. Straight pipes can be made into bends to meet the needs of the piping system.

Taking the pipe whose nominal specification is 1067*52 as an example, the inner diameter of the standard pipe is 963mm. During the process of forming the bend, the stretched surface of the bend is the thinning of the pipe wall on the outer arc surface of the bend. In order to meet the requirements of the pipe wall of the outer surface 142 of the bent pipe, the thickness b of the first side 110 of the straight pipe is 58 mm before the straight pipe is made into a bent pipe.

The thickness b of the first side 110 of the straight pipe is 58 mm to meet the requirements of the outer arc surface, and it is manufactured as an eccentric straight pipe. The thickness b of the first side 110 is 58 mm, and the second side 120 is in the process of forming a bend through the straight pipe Among them, the thickness of the second side 120 is increased, that is, the thickness of the compression surface or the inner arc surface of the elbow is increased, but a certain amount of thickening is beneficial through mechanical calculation, so the thickness a of the second side 120 is 52mm, which is the same as The tube walls of the first section 130 and the third section 150 have the same thickness.

Therefore, it is determined that the diameter of the outer wall of the middle part of the second section 140 of the straight pipe is 58+52+963=1067mm. The design requirements can be met by shifting the center of the outer wall of the second section 140 to the direction of the first side 110 by 3 mm.

The preparation method of the above-mentioned straight pipe is: firstly make a blank pipe with a thickness of 60 mm as a whole, turn the whole straight pipe to 58 mm, then adjust the eccentricity of the rotation center of the workpiece to 3 mm, and turn or bore the second section of the straight pipe to 140 mm to the whole Off-center (58mm on the first side 110b and 52mm on the second side 120a). Adjust the center of rotation of the workpiece again to process the concentric pipelines of the first segment 130 and the third segment 150 to 52 mm.

After the above-mentioned straight pipe is manufactured, the second section 140 of the straight pipe is bent along the direction of the first side 110 toward the second side 120 to form an elbow, so that the first side 110 is the outer side 142, which is the tensile surface, and the second Side 120 is the inner side 141 which is the compression face, forming the elbow. The specific way of forming the bent pipe is the prior art, which will not be repeated in this embodiment.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. a kind of for manufacturing the straight tube of bend pipe, which is characterized in that the tube wall of the straight tube has the first side and with described first The opposite second side in side, the straight tube include sequentially connected first segment, second segment and third section；

The pipe thickness of the tube wall of the first segment and the third section is uniform, the thickness of pipe wall of first side of the second segment Degree is greater than the pipe thickness of described second side of the second segment.

2. straight tube according to claim 1, which is characterized in that the thickness of the tube wall of described second side of the second segment with The consistency of thickness of the tube wall of the first segment.

3. straight tube according to claim 2, which is characterized in that close described the second of first side of the first segment One end of first side of section forms First Transition portion, and the slope ratio in the First Transition portion is 1:(20-30)；The third One end of first side close to the second segment of first side of section forms the second transition part, second transition part Slope ratio be 1:(20-30).

4. straight tube according to claim 3, which is characterized in that the thickness of the tube wall of described second side of the second segment is extremely The thickness of the tube wall of first side of the second segment gradually increases.

5. straight tube according to claim 1-4, which is characterized in that the pipe of first side of the second segment The difference of the pipe thickness of described second side of wall thickness and the second segment is 4-8mm.

6. straight tube according to claim 5, which is characterized in that the pipe thickness of first side of the second segment and institute The difference for stating the pipe thickness of described second side of second segment is 6mm.

7. a kind of bend pipe, which is characterized in that by the second segment of the straight tube described in any one of claims 1-6 along institute The direction for stating the first side towards described second side is bent to form.

8. bend pipe according to claim 7, which is characterized in that the pipe thickness of first side of the second segment and institute The pipe thickness for stating described second side of second segment is consistent.

9. bend pipe according to claim 8, which is characterized in that the central angle of the bend pipe is 80 ° -100 °.

10. bend pipe according to claim 9, which is characterized in that the central angle of the bend pipe is 90 °.