Pipe upsetting head with protection part

Abstract

The utility model relates to a pipe, in particular to a pipe upsetting head with a protection part, which comprises a pipe body and a sleeve, the pipe body comprises a constant diameter section and an upset head section, and a step surface is formed at the joint of the constant diameter section and the head section. The sleeve and the pipe body are coaxially arranged, the pipe body is sleeved with the sleeve, and one end face of the sleeve is attached to the step face. According to the pipe upsetting head with the protection part, the strength of the pipe upsetting head can be guaranteed.

Description

Technical Field

[0001] The utility model relates to a pipe, in particular to a pipe upset head with a protective part. Background Art

[0002] In order to facilitate the connection between the pipe and the mating part, an upset head is usually provided at the end of the pipe. The connection part between the upset head and the pipe is a structural transition part, where structural stress exists. When the pipe is assembled onto the mating part for use, due to the existence of assembly errors, greater assembly stress will be generated at this part than at other parts; when the mating part starts to work, due to vibration, greater vibration bending stress will also be generated at this part than at other parts. Therefore, this part will become a stress concentration part and is prone to fracture. Once fractured, causing the leakage of the medium or fuel, it will lead to the shutdown, damage or even fire of machines, vehicles, etc.

[0003] Based on this, it is necessary to protect the pipe fittings with upset heads. Content of the Utility Model

[0004] Technical Objective: In order to overcome the deficiencies in the prior art, the utility model provides a pipe upset head with a protective part.

[0005] Technical Solution: To achieve the above objective, the utility model discloses a pipe upset head with a protective part, which includes a pipe body and a sleeve. The pipe body includes a constant-diameter section and a head section formed by upsetting. A step surface is formed at the junction of the constant-diameter section and the head section. The sleeve is coaxially arranged with the pipe body and sleeved outside the pipe body, and one end surface of the sleeve is attached to the step surface.

[0006] Preferably, the sleeve is fixedly connected with the pipe body by interference fit.

[0007] Preferably, a single-arc transition part is provided at one end of the inner side surface of the sleeve.

[0008] Preferably, a stepped transition part is provided at one end of the inner side surface of the sleeve.

[0009] Preferably, the sleeve is made of carbon steel or alloy steel.

[0010] Preferably, the outer surface of the sleeve is coated with galvanized, zinc-nickel alloy galvanized, Dacromet, blued oxidation, phosphating coating.

[0011] Preferably, the sleeve is made of stainless steel.

[0012] Preferably, protrusions are arranged in an array along the circumferential direction inside the sleeve.

[0013] Preferably, chambers are formed between the protrusions, and fillers are filled in the chambers.

[0014] Preferably, the sleeve is divided into a flat gasket type, a sheath type, and a reverse sheath type; the outer surface of the flat gasket type sleeve is cylindrical, the bottom of the outer surface of the sheath type sleeve is provided with a boss, and the top of the outer surface of the reverse sheath type sleeve is provided with a boss; the pressing surface of the sleeve is planar, conical or arc-shaped.

[0015] The utility model has the following technical effects:

[0016] In this device, a sleeve is added to the pipe fitting with a upset head, thereby increasing the strength at the joint of the constant diameter section and the head section, resolving the stress concentration phenomenon, and thus reducing or avoiding the hidden danger of the upset head breaking. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of Embodiment 1;

[0018] Figure 2 It is a schematic structural diagram of the sleeve in Embodiment 1;

[0019] Figure 3 It is a schematic structural diagram of Embodiment 2;

[0020] Figure 4 It is a schematic structural diagram of the sleeve in Embodiment 2;

[0021] Figure 5 It is a schematic structural diagram of Embodiment 3;

[0022] Figure 6 It is a schematic structural diagram of the sleeve in Embodiment 3;

[0023] Figure 7 It is a schematic structural diagram of Embodiment 4;

[0024] Figure 8 It is a schematic structural diagram of the sleeve in Embodiment 4;

[0025] Figure 9 It is a schematic structural diagram of Embodiment 5;

[0026] Figure 10 It is a schematic structural diagram of the sleeve in Embodiment 5;

[0027] Figure 11 It is a schematic structural diagram of Embodiment 6;

[0028] Figure 12 It is a schematic structural diagram of the sleeve in Embodiment 6;

[0029] Figure 13 It is a schematic diagram of the end face where the sleeve is connected to the pipe body in one of the embodiments;

[0030] Figure 14Schematic diagram of the end face where the sleeve is connected to the pipe body in another embodiment;

[0031] Figure 15 Schematic diagram of the principle of the device for fixing the pipe body and the sleeve.

[0032] In the figure, 1 is the pipe body; 2 is the sleeve; 101 is the constant diameter section; 102 is the head section; 103 is the step surface; 201 is the single arc transition part; 202 is the stepped transition part; 203 is the protrusion; 204 is the chamber; 205 is the pressing surface; 301 is the fixed head; 302 is the moving head; 303 is the gap. Specific implementation mode

[0033] The following combines the attached Figure 1 to the attached Figure 15 Describe the principle and features of the present invention. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] A pipe upset head with a protective part includes a pipe body 1 and a sleeve 2. The pipe body 1 includes a constant diameter section 101 and a head section 102 formed by upsetting. A step surface 103 is formed at the junction of the constant diameter section 101 and the head section 102. The sleeve 2 is coaxially arranged with the pipe body 1 and sleeved outside the pipe body 1. One end face of the sleeve 2 is attached to the step surface 103. Usually, one end of the inner side surface of the common sleeve 2 is of two forms, namely a single arc transition part 201 and a stepped transition part 202. The single arc transition part 201 is as shown in the attached Figure 6 and the attached Figure 12 shown, and the stepped transition part 202 is as shown in the attached Figure 2 , the attached Figure 4 , the attached Figure 8 , the attached Figure 10 shown. The sleeve 2 is any one of carbon steel, alloy steel or stainless steel. When the sleeve 2 is made of carbon steel or alloy steel, a galvanized, zinc-nickel alloy, dacromet, blued or phosphated coating is applied on the outer surface of the sleeve 2; when the sleeve 2 is made of stainless steel, the surface of the sleeve 2 is not coated.

[0035] As one embodiment, the inner side surface of the sleeve 2 is smooth, and the inner side surface of the sleeve 2 is completely attached to the outer side surface of the pipe body 1.

[0036] As another embodiment, protrusions 203 are arranged in an array along the circumferential direction inside the sleeve 2. After the sleeve 2 is connected to the pipe body 1, a chamber is formed between adjacent protrusions 203, and a filler is filled in the chamber. The filler in this embodiment is rubber or sponge.

[0037] The sleeve 2 is fixedly connected to the pipe body 1 with interference fit. Specifically, the sleeve 2 and the pipe body 1 are connected together by a fixture as shown in the appendix Figure 14 . The fixture is divided into a fixed head 301 and a movable head 302. When connecting, first put the sleeve 2 on the pipe body 1. A gap δ303 larger than the outer diameter of the pipe body 1 is pre-machined at the end of the fixed head 301 for fixing the sleeve 2. Clamp the pipe body 1 with the fixed head 301, move the movable head 302 close to the fixed head 301, the pipe body 1 expands to form a upset head shape, and at the same time, the sleeve 2 is connected to the pipe body 1 with interference fit.

[0038] According to the shape of the sleeve 2, Embodiment 1 shown in the appendix Figure 1 , Embodiment 3 shown in the appendix Figure 3 , Embodiment 5 shown in the appendix Figure 5 , Embodiment 7 shown in the appendix Figure 7 , Embodiment 9 shown in the appendix Figure 9 , Embodiment 11 shown in the appendix Figure 11 are formed. In the above embodiments, the shape of the sleeve 2 is mainly divided into three types, namely flat gasket type, sheath type and reverse sheath type; the outer surface of the flat gasket type sleeve 2 is cylindrical, as shown in Embodiment 1; a boss is provided at the bottom of the outer surface of the sheath type sleeve 2, as shown in Embodiment 2; a boss is provided at the top of the outer surface of the reverse sheath type sleeve 2, as shown in Embodiment 3; at the same time, the pressing surface 205 of the sleeve 2 is also divided into three shapes, namely flat shape, conical shape or arc shape.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tube upset head with a protective part, characterized in that: The invention comprises a pipe body (1) and a sleeve (2), wherein the pipe body (1) comprises a constant diameter section (101) and a head section (102) formed by upsetting, a step surface (103) is formed at the intersection of the constant diameter section (101) and the head section (102), and the sleeve (2) is coaxially arranged with the pipe body (1) and sleeved on the outside of the pipe body (1), and one end surface of the sleeve (2) is in contact with the step surface (103).

2. The tube upset head with protective parts according to claim 1, characterized in that: The sleeve (2) is fixedly connected to the pipe body (1) by interference fit.

3. The tube upset head with protective parts according to claim 2, characterized in that: A single arc transition portion (201) is provided at one end of the inner side surface of the sleeve (2).

4. The tube upset head with protective parts according to claim 2, characterized in that: A stepped transition portion (202) is provided at one end of the inner side surface of the sleeve (2).

5. The tube upset head with protective parts according to claim 3 or 4, characterized in that: The sleeve (2) is made of carbon steel or alloy steel.

6. The tube upset head with protective parts according to claim 5, characterized in that: The outer surface of the sleeve (2) is coated with zinc plating, zinc-nickel alloy plating, Dacromet, blue oxidation, and phosphating coatings.

7. The tube upset head with a protective part according to claim 3 or 4, characterized in that: The sleeve (2) is made of stainless steel.

8. The tube upset head with protective parts according to claim 1, characterized in that: Protrusions (203) are arranged in an array along a circumferential direction inside the sleeve (2).

9. The tube upset head with protective parts according to claim 8, characterized in that: A cavity (204) is formed between the protrusions (203), and the cavity is filled with a filler.

10. The tube upset head with protective parts according to claim 1, characterized in that: The sleeve (2) is divided into a flat pad type, a sleeve type and an inverted sleeve type; the outer surface of the flat pad type sleeve (2) is cylindrical, the bottom of the outer surface of the sleeve type sleeve (2) is provided with a boss, and the top of the outer surface of the inverted sleeve type sleeve (2) is provided with a boss; the pressing surface (205) of the sleeve (2) is flat, conical or arc-shaped.

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