Corrosion-resistant duplex stainless steel pipe fitting

Abstract

A corrosion-resistant duplex stainless steel pipe fitting comprises a pipe fitting body, and the pipe fitting body is sleeved with a plurality of protective sleeves which are evenly distributed in the axial direction. The edge of the left end opening of the protective sleeve extends leftwards to form an annular limiting part; an annular limiting groove is formed in the inner wall of the right end opening of the protective sleeve; the adjacent protective sleeves are attached to each other. The limiting part at the left end of one protective sleeve is embedded into the limiting groove of the protective sleeve adjacent to the protective sleeve; the left end of the pipe fitting body is sleeved with a left positioning sleeve coaxial with the pipe fitting body, and the right end face of the left positioning sleeve is attached to the left end face of the protection sleeve located on the leftmost side. A positioning groove matched with the limiting part is formed in the inner wall of the right end opening of the left positioning sleeve; the right end of the pipe fitting body is sleeved with a right positioning sleeve coaxial with the pipe fitting body. The corrosion-resistant duplex stainless steel pipe fitting can effectively prevent rainwater from corroding the corrosion-resistant duplex stainless steel pipe fitting, and the service life of the corrosion-resistant duplex stainless steel pipe fitting is effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of pipe fittings, in particular to a kind of corrosion-resistant duplex stainless steel pipe fittings. BACKGROUND

[0002] Pipe fittings are mainly applied in pipeline system, with the functions of connection, control, direction change, flow distribution, etc. When pipe fittings are actually used, they are often used in the outside world. Pipe fittings in the outside world are affected by weather, especially rain. Rainwater will continuously contact the outer wall of pipe fittings. After rain stops, rainwater will still remain on the outer wall of pipe fittings. Rainwater will corrode pipe fittings, which will cause problems such as thinning of pipe wall and weakening of strength of pipe fittings. Without any protective structure outside pipe fittings, rainwater corrosion will seriously affect the service life of pipe fittings. SUMMARY

[0003] The utility model solves the prior art problem to provide a kind of corrosion-resistant duplex stainless steel pipe fittings, it can effectively avoid rainwater to carry out corrosion to itself, effectively guarantee the service life of itself.

[0004] The utility model solves the above-mentioned technical problem by adopting the technical scheme of:

[0005] The utility model discloses a kind of corrosion-resistant duplex stainless steel pipe fittings, including pipe fitting body, the pipe fitting body is sheathed with several be evenly distributed in axial protection sleeve;The left end port rim of protection sleeve extends to the left with a annular limiting portion;The left end port inner wall of protection sleeve is equipped with a annular limiting groove;Adjacent protection sleeve is mutually adhered;The limiting portion of the left end of one of protection sleeve is embedded in the limiting groove of the protection sleeve adjacent thereto;The pipe fitting body left end is sheathed with a coaxial left positioning sleeve, and the left end surface of left positioning sleeve right end face is adhered with the left end surface of the leftmost protection sleeve;The left end port inner wall of left positioning sleeve is equipped with a positioning groove matched with limiting portion;The pipe fitting body right end is sheathed with coaxial right positioning sleeve, and the left end surface of right positioning sleeve is adhered with the right end surface of the rightmost protection sleeve;The left end port rim of right positioning sleeve extends to the left with a annular positioning portion, and the positioning portion is embedded in the limiting groove of the rightmost protection sleeve;The left side of left positioning sleeve is equipped with a left positioning structure matched with the left end of pipe fitting body;The right side of right positioning sleeve is equipped with a right positioning structure matched with the right end of pipe fitting body.

[0006] The left positioning structure includes a left nut threadedly connected to the outside of the left end of the left positioning sleeve; the inner wall of the left end port of the left nut extends inward to form a left extrusion portion outside the pipe body, and the left extrusion portion is annular; a left fastening sleeve is provided between the inner wall of the left end of the left positioning sleeve and the outer wall of the pipe body, and the inner wall of the left fastening sleeve is in contact with the outer wall of the pipe body; the outer wall of the left part of the left fastening sleeve is provided with a first left pressure conical surface that is narrow on the left and wide on the right; the outer wall of the right part of the left fastening sleeve is provided with a first right pressure conical surface that is narrow on the right and wide on the left; the inner wall of the left end port of the left positioning sleeve is provided with a first right extrusion conical surface that is in contact with the first right pressure conical surface; the inner wall of the right end hole of the inner hole of the left extrusion portion is provided with a first left extrusion conical surface that is in contact with the first left pressure conical surface.

[0007] The right positioning structure includes a right nut screwed onto the outside of the right end of the right positioning sleeve; the inner wall of the right end port of the right nut extends inward to form a right extrusion portion outside the pipe body, and the right extrusion portion is annular; a right fastening sleeve is provided between the inner wall of the right end of the right positioning sleeve and the outer wall of the pipe body, and the inner wall of the right fastening sleeve is in contact with the outer wall of the pipe body; the outer wall of the left part of the right fastening sleeve is provided with a second left pressure conical surface that is narrow on the left and wide on the right; the outer wall of the right part of the right fastening sleeve is provided with a second right pressure conical surface that is narrow on the right and wide on the left; the inner wall of the right end port of the right positioning sleeve is provided with a second left extrusion conical surface that is in contact with the second left pressure conical surface; the inner wall of the left end port of the inner hole of the right extrusion portion is provided with a second right extrusion conical surface that is in contact with the second right pressure conical surface.

[0008] An annular sealing gasket is provided between the left end face of the left positioning sleeve and the right side wall of the left extrusion part, and between the right end face of the right positioning sleeve and the left side wall of the right extrusion part; an annular clamping groove is provided on the left end face of the left positioning part and the right end face of the right positioning part; a clamping part matching the clamping groove is provided on the sealing gasket; the sealing gasket and the clamping part are integrally formed and are both made of rubber.

[0009] The right end surface of the right positioning sleeve and the right end surface of the protective sleeve are both provided with an annular sealing groove; a matching sealing ring is provided in the sealing groove, and the sealing ring is made of rubber; an annular notch is provided on the outer edge of the right side wall of the sealing ring; the width of the notch gradually increases from right to left.

[0010] The pipe body is made of duplex stainless steel.

[0011] The beneficial effects of the utility model are:

[0012] Compared with the prior art, the left positioning sleeve, the right positioning sleeve and several axially evenly distributed protective sleeves of the corrosion-resistant duplex stainless steel pipe fittings using the structure of the utility model can form a tubular protective structure on the outer ring of the pipe body, effectively enclosing the outer wall of the pipe. Even in rainy weather, the outer walls of the left positioning sleeve, the right positioning sleeve and the protective sleeve will replace the outer wall of the pipe body to contact the rainwater, effectively preventing the outer wall of the pipe body from being directly in contact with the rainwater and causing corrosion, thereby effectively avoiding the corrosion of the pipe body causing the pipe wall to become thinner and the strength to be weakened, and effectively ensuring the service life of the pipe body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the utility model's corrosion-resistant duplex stainless steel pipe fitting;

[0014] Figure 2 yes Figure 1 An enlarged view of part A;

[0015] Figure 3 yes Figure 1 An enlarged view of part B;

[0016] Figure 4 yes Figure 1 An enlarged view of section C. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0018] See also Figures 1 to 4 The utility model provides a corrosion-resistant duplex stainless steel pipe fitting, comprising a pipe fitting body 1, wherein the pipe fitting body 1 is covered with a plurality of protective sleeves 2 uniformly distributed in the axial direction; an annular limiting portion 3 is extended to the left from the edge of the left end port of the protective sleeve 2; an annular limiting groove 4 is provided on the inner wall of the right end port of the protective sleeve 2; adjacent protective sleeves 2 fit each other; the limiting portion 3 at the left end of one protective sleeve 2 is embedded in the limiting groove 4 of the adjacent protective sleeve; a left positioning sleeve 5 coaxial with the left end of the pipe fitting body 1 is covered with the left positioning sleeve 5, and the right end face of the left positioning sleeve 5 is aligned with the left end face of the left protective sleeve 2 located on the leftmost side. The end faces fit together; the inner wall of the right end port of the left locating sleeve 5 is provided with a locating groove 6 that matches the limiting portion 3; the right end of the pipe body 1 is outer-circuited with a right locating sleeve 7 coaxial therewith, and the left end face of the right locating sleeve 7 fits together with the right end face of the protective sleeve 2 located on the far right; the edge of the left end port of the right locating sleeve 7 extends to the left with an annular locating portion 8, which is embedded in the limiting groove 4 of the rightmost protective sleeve 2; the left side of the left locating sleeve 5 is provided with a left locating structure that matches the left end of the pipe body 1; the right side of the right locating sleeve 7 is provided with a right locating structure that matches the right end of the pipe body 1.

[0019] The left positioning structure comprises a left nut 9 screwed on the left end of the left positioning sleeve 5; the left end of the left nut 9 extends inwardly to form a left extrusion part 10 sleeved on the pipe body 1, and the left extrusion part 10 is annular; a left fastening sleeve 11 is arranged between the left end inner wall of the left positioning sleeve 5 and the outer wall of the pipe body 1, and the inner wall of the left fastening sleeve 11 is attached to the outer wall of the pipe body 1; the left part of the outer wall of the left fastening sleeve 11 is provided with a first left compression cone surface 12 which is narrow on the left and wide on the right; the right part of the outer wall of the left fastening sleeve 11 is provided with a first right compression cone surface 13 which is narrow on the right and wide on the left; the left end inner wall of the left positioning sleeve 5 is provided with a first right extrusion cone surface 14 which is attached to the first right compression cone surface 13; and the right end inner hole of the left extrusion part 10 is provided with a first left extrusion cone surface 15 which is attached to the first left compression cone surface 12.

[0020] The right positioning structure comprises a right nut 16 screwed on the right end of the right positioning sleeve 7; the right end of the right nut 16 extends inwardly to form a right extrusion part 17 sleeved on the pipe body 1, and the right extrusion part 17 is annular; a right fastening sleeve 18 is arranged between the right end inner wall of the right positioning sleeve 7 and the outer wall of the pipe body 1, and the inner wall of the right fastening sleeve 18 is attached to the outer wall of the pipe body 1; the left part of the outer wall of the right fastening sleeve 18 is provided with a second left compression cone surface 19 which is narrow on the left and wide on the right; the right part of the outer wall of the right fastening sleeve 18 is provided with a second right compression cone surface 20 which is narrow on the right and wide on the left; the right end inner wall of the right positioning sleeve 7 is provided with a second left extrusion cone surface 21 which is attached to the second left compression cone surface 19; and the left end inner hole of the right extrusion part 17 is provided with a second right extrusion cone surface 22 which is attached to the second right compression cone surface 20.

[0021] The left end face of the left positioning sleeve 5 and the right side wall of the left extrusion part 10, and the right end face of the right positioning sleeve 7 and the left side wall of the right extrusion part 17 are both provided with a sealing gasket 23 which is annular; the left end face of the left positioning part 8 and the right end face of the right positioning part 8 are both provided with a clamping groove 24 which is annular; the sealing gasket 23 is provided with a clamping portion 25 which is matched with the clamping groove 24; the sealing gasket 23 and the clamping portion 25 are integrally formed and are both made of rubber material.

[0022] The right end face of the right positioning sleeve 7 and the right end face of the protective sleeve 2 are both provided with a sealing groove 26 which is annular; the sealing groove 26 is provided with a sealing ring 27 which is matched with the sealing groove 26, and the sealing ring 27 is made of rubber material; the right side wall of the sealing ring 27 is provided with a notch 28 which is annular; and the width of the notch 28 gradually increases from right to left.

[0023] The pipe body 1 is made of duplex stainless steel.

[0024] The use method of the utility model is as follows:

[0025] The left positioning sleeve 5, the right positioning sleeve 7 and several axially evenly distributed protective sleeves 2 can form a tubular protective structure on the outer circle of the pipe body 1, effectively enclosing the outer wall of the pipe. Even in rainy weather, the outer wall of the left positioning sleeve 5, the right positioning sleeve 7 and the protective sleeve 2 will replace the outer wall of the pipe body 1 to contact the rainwater, effectively preventing the outer wall of the pipe body 1 from directly contacting the rainwater and causing corrosion, thereby effectively avoiding the corrosion of the pipe body 1 and causing the pipe wall to become thinner and the strength to be weakened, effectively ensuring the service life of the pipe.

[0026] The existence of the left positioning structure can effectively limit the position of the left positioning sleeve 5, and the existence of the right positioning structure can effectively limit the position of the right positioning sleeve 7, thereby limiting the positions of several protective sleeves 2 located between the left positioning sleeve 5 and the right positioning sleeve 7, thereby achieving the fixation of the left positioning sleeve 5, the right positioning sleeve 7 and the protective sleeve 2.

[0027] When it is necessary to limit the position of the left locating sleeve 5 by the left positioning structure, it is only necessary to rotate the left nut 9 to move the left extrusion portion 10 to the right. When the left extrusion portion 10 moves to the right, the first left extrusion cone 15 will move to the right along the trajectory of the first left pressure cone 12, and the first right extrusion cone 14 will move to the left along the trajectory of the first right pressure cone 13. At this time, the first left extrusion cone 15 squeezes the first left pressure cone 12 toward the center of the pipe body 1, and the first right extrusion cone 14 squeezes the first right pressure cone 13 toward the center of the pipe body 1. Under the action of pressure, the inner wall of the left fastening sleeve 11 will undergo a certain degree of deformation, and the inner wall of the left fastening sleeve 11 will be further pressed against the outer wall of the left end of the pipe body 1, and the left locating sleeve 5 is fixed by the tightening force.

[0028] When it is necessary to limit the position of the right positioning sleeve 7 by the right positioning structure, it is only necessary to rotate the right nut 16 to squeeze the right extrusion portion 17 to the left. When the right extrusion portion 17 moves to the left, the second right extrusion cone 22 will move to the left along the trajectory of the second right pressure cone 20, and the second left extrusion cone 21 will move to the right along the trajectory of the second left pressure cone 19. At this time, the second left extrusion cone 21 squeezes the second left pressure cone 19 toward the center of the pipe body 1, and the second right extrusion cone 22 squeezes the second right pressure cone 20 toward the center of the pipe body 1. Under the action of pressure, the inner wall of the right fastening sleeve 18 will undergo a certain degree of deformation, and the inner wall of the right fastening sleeve 18 will be further pressed against the outer wall of the right end of the pipe body 1, and the right positioning sleeve 7 is fixed by the tightening force.

[0029] An annular sealing gasket 23 is provided between the left end face of the left positioning sleeve 5 and the right side wall of the left extrusion part 10, and between the right end face of the right positioning sleeve 7 and the left side wall of the right extrusion part 17. The left end face of the left positioning part 8 and the right end face of the right positioning part 8 are both provided with an annular clamping groove 24. The sealing gasket 23 is provided with a clamping portion 25 that matches the clamping groove 24. The sealing gasket 23 and the clamping portion 25 are integrally formed and are both made of rubber material. The presence of the clamping portion 25 can realize the positioning of the sealing gasket 23, ensuring the stability of the sealing gasket 23 when it is located between the left end face of the left positioning sleeve 5 and the right side wall of the left extrusion part 10, and between the right end face of the right positioning sleeve 7 and the left side wall of the right extrusion part 17. The presence of the sealing gasket 23 can effectively improve the sealing between the left end face of the left positioning sleeve 5 and the right side wall of the left extrusion part 10, and between the right end face of the right positioning sleeve 7 and the left side wall of the right extrusion part 17, and effectively prevent the leakage of external rainwater inward.

[0030] The right end face of the right positioning sleeve 7 and the right end face of the protective sleeve 2 are both provided with an annular sealing groove 26, and a matching sealing ring 27 is provided in the sealing groove 26. The sealing ring 27 is made of rubber. The presence of the sealing ring 27 can effectively improve the sealing between the left positioning sleeve 5 and the leftmost protective sleeve 2, between adjacent protective sleeves 2, and between the right positioning sleeve 7 and the rightmost protective sleeve 2, thereby avoiding the leakage of external rainwater toward the pipe body 1 to the greatest extent, and further improving the anti-corrosion effect.

[0031] If rainwater leaks into the sealing groove, since there is an annular notch 28 on the outer edge of the right side wall of the sealing ring 27, and the width of the notch 28 gradually increases from right to left, the notch 28 will form an annular water accumulation groove. As rainwater continues to accumulate in the water accumulation groove, the pressure in the water accumulation groove increases. At this time, this pressure will squeeze the inner wall of the notch, thereby causing the sealing ring 27 to expand, further improving the sealing effect of the sealing ring 27.

[0032] The pipe body 1 is made of duplex stainless steel, which has high strength and extremely high corrosion resistance. It can not only effectively resist the corrosion of rainwater, but also effectively resist the corrosion of the liquid transported by the pipe itself, while ensuring the corrosion resistance of the outer and inner walls of the pipe body 1.

Claims

1. A corrosion-resistant duplex stainless steel pipe fitting, comprising a pipe fitting body, characterized in that: The pipe body is covered with a plurality of protective sleeves evenly distributed in the axial direction; an annular limiting portion is extended to the left from the edge of the left end port of the protective sleeve; an annular limiting groove is provided on the inner wall of the right end port of the protective sleeve; adjacent protective sleeves fit each other; the limiting portion at the left end of one protective sleeve is embedded in the limiting groove of the adjacent protective sleeve; the left end of the pipe body is covered with a left positioning sleeve coaxial with it, and the right end face of the left positioning sleeve fits with the left end face of the protective sleeve located on the leftmost side; the right end of the left positioning sleeve A positioning groove matching the limiting part is provided on the inner wall of the port; a right positioning sleeve coaxial with the right end of the pipe body is provided on the outer sleeve of the right end, and the left end face of the right positioning sleeve is in contact with the right end face of the protective sleeve located on the far right; an annular positioning part is extended to the left from the edge of the left end port of the right positioning sleeve, and the positioning part is embedded in the limiting groove of the rightmost protective sleeve; a left positioning structure matching the left end of the pipe body is provided on the left side of the left positioning sleeve; a right positioning structure matching the right end of the pipe body is provided on the right side of the right positioning sleeve.

2. The corrosion-resistant duplex stainless steel pipe fitting according to claim 1, characterized in that: The left positioning structure includes a left nut threadedly connected to the outside of the left end of the left positioning sleeve; the inner wall of the left end port of the left nut extends inward to form a left extrusion portion outside the pipe body, and the left extrusion portion is annular; a left fastening sleeve is provided between the inner wall of the left end of the left positioning sleeve and the outer wall of the pipe body, and the inner wall of the left fastening sleeve is in contact with the outer wall of the pipe body; the outer wall of the left part of the left fastening sleeve is provided with a first left pressure conical surface that is narrow on the left and wide on the right; the outer wall of the right part of the left fastening sleeve is provided with a first right pressure conical surface that is narrow on the right and wide on the left; the inner wall of the left end port of the left positioning sleeve is provided with a first right extrusion conical surface that is in contact with the first right pressure conical surface; the inner wall of the right end hole of the inner hole of the left extrusion portion is provided with a first left extrusion conical surface that is in contact with the first left pressure conical surface.

3. The corrosion-resistant duplex stainless steel pipe fitting according to claim 2, characterized in that: The right positioning structure includes a right nut screwed onto the outside of the right end of the right positioning sleeve; the inner wall of the right end port of the right nut extends inward to form a right extrusion portion outside the pipe body, and the right extrusion portion is annular; a right fastening sleeve is provided between the inner wall of the right end of the right positioning sleeve and the outer wall of the pipe body, and the inner wall of the right fastening sleeve is in contact with the outer wall of the pipe body; the outer wall of the left part of the right fastening sleeve is provided with a second left pressure conical surface that is narrow on the left and wide on the right; the outer wall of the right part of the right fastening sleeve is provided with a second right pressure conical surface that is narrow on the right and wide on the left; the inner wall of the right end port of the right positioning sleeve is provided with a second left extrusion conical surface that is in contact with the second left pressure conical surface; the inner wall of the left end port of the inner hole of the right extrusion portion is provided with a second right extrusion conical surface that is in contact with the second right pressure conical surface.

4. The corrosion-resistant duplex stainless steel pipe fitting according to claim 3, characterized in that: An annular sealing gasket is provided between the left end face of the left locating sleeve and the right side wall of the left extrusion part, and between the right end face of the right locating sleeve and the left side wall of the right extrusion part; an annular clamping groove is provided on the left end face of the left locating sleeve and the right end face of the right locating sleeve; a clamping part matching the clamping groove is provided on the sealing gasket; the sealing gasket and the clamping part are integrally formed and are both made of rubber.

5. The corrosion-resistant duplex stainless steel pipe fitting according to claim 1, characterized in that: The right end surface of the right positioning sleeve and the right end surface of the protective sleeve are both provided with an annular sealing groove; a matching sealing ring is provided in the sealing groove, and the sealing ring is made of rubber; an annular notch is provided on the outer edge of the right side wall of the sealing ring; the width of the notch gradually increases from right to left.

6. The corrosion-resistant duplex stainless steel pipe fitting according to claim 1, characterized in that: The pipe body is made of duplex stainless steel.

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