CN221723639U - Corrosion-resistant expansion joint capable of bearing high temperature and high positive and negative pressure - Google Patents

Abstract

The utility model discloses an anti-corrosion expansion joint capable of bearing high temperature and high positive and negative pressure, which comprises: the top of the elastic expansion part is fixedly connected with the first flange, the bottom of the elastic expansion part is fixedly connected with the second flange, the limiting part is connected between the first flange and the second flange, the utility model provides an anti-corrosion expansion joint which has reliable structure, convenient installation, wide application range, corrosion resistance and high temperature and high positive and negative pressure resistance and can bear high temperature and high pressure environments.

Description

Anti-corrosion expansion joints that can withstand high temperatures and high positive and negative pressures

Technical Field

The utility model relates to the field of chemical equipment, and more specifically to an anti-corrosion expansion joint capable of bearing high temperature and high positive and negative pressure.

Background Art

Expansion joints refer to flexible components that can effectively compensate for axial deformation, contraction, dislocation, and angular deviation. For example, the expansion joints welded on the fixed tube sheet heat exchanger shell have large axial flexibility and are easy to deform. They can compensate for the thermal expansion difference between the tube and the shell due to different wall temperatures, reduce their axial loads, and thus reduce the temperature difference stress of the tube, tube sheet, and shell, avoiding strength damage, instability damage, and tube pull-off damage.

As an elastic compensation element that can be freely expanded and contracted, the expansion joint has the advantages of reliable operation, good performance, and compact structure, and has been widely used in chemical, metallurgical, nuclear energy and other sectors. In particular, the expansion joint used in the chemical industry needs to be corrosion-resistant and able to withstand high temperatures and high positive and negative pressures.

Expansion joints in the prior art do not have an anti-corrosion function. Furthermore, when used in positive high pressure or negative high pressure equipment, they are severely deformed, severely expand outwards under positive high pressure, and severely collapse inwards or even close under negative high pressure, making them unusable.

Utility Model Content

In order to solve the above problems, the purpose of the utility model is to provide an anti-corrosion expansion joint which has a reliable structure, is easy to install, has a wide range of applications, is corrosion-resistant and can withstand high temperature and high pressure environments and can withstand high temperatures and high positive and negative pressures.

According to one aspect of the utility model, an anti-corrosion expansion joint capable of withstanding high temperature and high positive and negative pressure is provided, comprising: a first flange, a second flange, an elastic expansion portion and a limiting portion, wherein the top of the elastic expansion portion is fixedly connected to the first flange, the bottom of the elastic expansion portion is fixedly connected to the second flange, the limiting portion is connected between the first flange and the second flange, and the limiting portion limits the position of the elastic expansion portion moving in the radial direction. Pipes at both ends are connected by the first flange and the second flange, and the elastic expansion portion is limited in radial movement by the limiting portion, so that it is convenient to use in positive and negative high pressure equipment.

In some embodiments, the first flange is provided with a plurality of first mounting holes, the first mounting holes are provided in a plurality and are distributed in a circular array with the axis of the first flange as the center, and at least three second mounting holes are provided outside the first mounting holes. The first mounting holes are convenient for connection with equipment pipelines, and the second mounting holes are convenient for fixing the limiter.

In some embodiments, the second flange is provided with a plurality of third mounting holes, the third mounting holes are provided in a plurality and are distributed in a circular array with the axis of the second flange as the center, and at least three fourth mounting holes are provided outside the third mounting holes. The third mounting holes are convenient for connection with equipment pipelines, and the fourth mounting holes are convenient for fixing the limiter.

In some embodiments, the first flange is vertically disposed above the second flange, the second mounting hole is disposed corresponding to the fourth mounting hole, and the limiting portion passes through the second mounting hole and the fourth mounting hole.

In some embodiments, the number of the limiting parts is consistent with the number of the second mounting holes or the fourth mounting holes. By providing at least three limiting parts, the first fixing ring and the second fixing ring are further limited to move outward.

In some embodiments, the limiting portion includes: a first bolt, a first nut and a limiting sleeve, the first bolt passes through the fourth mounting hole, the limiting sleeve is sleeved on the outer wall of the first bolt and is placed between the first flange and the second flange, the top of the first bolt extends out of the second mounting hole, and the first nut is connected to the top of the first bolt. The first fixing ring and the second fixing ring are limited to move outward by blocking the limiting sleeve.

In some embodiments, the first nut adjusts the distance between the limiting sleeve and the bottom of the first flange and the top of the second flange. The retracted size of the elastic telescopic part is controlled by the first flange and the second flange blocking the limiting sleeve through the distance between the top of the limiting sleeve and the first flange and the second flange.

In some embodiments, the elastic expansion part includes: a first fixing ring, a second fixing ring, a first elastic sheet, a second elastic sheet, a second bolt and a second nut, the first fixing ring is provided with a plurality of fifth mounting holes, the second fixing ring is provided with a plurality of sixth mounting holes, one end of the first elastic sheet is provided with a plurality of seventh mounting holes, the other end of the first elastic sheet is fixedly connected to the first flange, one end of the second elastic sheet is provided with a plurality of eighth mounting holes, the other end of the second elastic sheet is fixedly connected to the second flange, the second bolt passes through the sixth mounting hole, the eighth mounting hole, the seventh mounting hole and the fifth mounting hole in sequence, and the second nut is threadedly connected with the second bolt to closely fit the first elastic sheet and the second elastic sheet. The first fixing ring and the second fixing ring are used to first seal and fix the ends of the first elastic sheet and the second elastic sheet, and second limit the distance that the first elastic sheet and the second elastic sheet move outward under positive high pressure.

In some embodiments, there is a gap between the limiting sleeve and the outer walls of the first fixing ring and the second fixing ring, and the limiting sleeve limits the first fixing ring and the second fixing ring from moving outward. The gap between the limiting sleeve and the outer walls of the first fixing ring and the second fixing ring limits the distance that the first elastic sheet and the second elastic sheet move outward under positive high pressure.

In some embodiments, the first elastic sheet and the second elastic sheet are made of PFA, FEP, ETFE or PTFE. The first elastic sheet and the second elastic sheet made of the above materials make the utility model corrosion-resistant and can be used in a corrosive environment.

Compared with the prior art, the utility model has the beneficial effects of reliable structure, convenient installation, wide application range, corrosion resistance and ability to withstand high temperature and high pressure environment; the utility model connects the pipelines at both ends through the first flange and the second flange, and limits the radial movement of the elastic expansion part through the limiting part, which is convenient for use in positive and negative high pressure equipment; it is convenient to connect with the equipment pipeline through the first mounting hole and the third mounting hole, and it is convenient to fix the limiting part through the second mounting hole and the fourth mounting hole; by setting at least three limiting parts, the outward movement of the first fixing ring and the second fixing ring is further limited; the size of the retraction of the elastic expansion part is controlled by the first flange and the second flange blocking the limiting sleeve through the distance between the top of the limiting sleeve and the first flange and the second flange; the first pair of ends of the first elastic sheet and the second elastic sheet are sealed and fixed by the first fixing ring and the second fixing ring, and the second limit the distance of the outward movement of the first elastic sheet and the second elastic sheet under positive high pressure; the first elastic sheet and the second elastic sheet made of the above materials make the utility model corrosion-resistant and can be used in a corrosive environment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of the anti-corrosion expansion joint of the utility model which can withstand high temperature and high positive and negative pressure;

FIG2 is an exploded schematic diagram of the utility model of an anti-corrosion expansion joint capable of withstanding high temperature and high positive and negative pressure;

FIG3 is a top view of the anti-corrosion expansion joint of the utility model that can withstand high temperature and high positive and negative pressure;

FIG. 4 is a cross-sectional view taken along line BB in FIG. 3 .

DETAILED DESCRIPTION

The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms

"Installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meaning of the terms can be understood according to the specific circumstances.

As shown in Figures 1 and 2, the anti-corrosion expansion joint that can withstand high temperature and high positive and negative pressure described in the utility model includes: a first flange 1, a second flange 2, an elastic expansion part 3 and a limiting part 4, the top of the elastic expansion part 3 is fixedly connected to the first flange 1, the bottom of the elastic expansion part 3 is fixedly connected to the second flange 2, the limiting part 4 is connected between the first flange 1 and the second flange 2, and the limiting part 4 limits the radial movement position of the elastic expansion part 3. The pipeline at both ends is connected by the first flange 1 and the second flange 2, and the elastic expansion part 3 is limited in radial movement by the limiting part 4, which is convenient for use in positive and negative high-pressure equipment.

As shown in FIG3 , the first flange 1 is provided with a plurality of first mounting holes 11, which are arranged in a circular array with the axis of the first flange 1 as the center, and at least three second mounting holes 12 are arranged outside the first mounting holes 11. The first mounting holes 11 are convenient for connection with equipment pipelines, and the second mounting holes 12 are convenient for fixing the stopper 4. The second mounting holes 12 are also arranged in a circular array with the axis of the first flange 1 as the center, so the second mounting holes 12 are outside the first mounting holes 11.

The second flange 2 is provided with a plurality of third mounting holes 21, which are arranged in a circular array with the axis of the second flange 2 as the center, and at least three fourth mounting holes are arranged outside the third mounting holes 21. The third mounting holes 21 are convenient for connection with equipment pipelines, and the fourth mounting holes 22 are convenient for fixing the limiter 4. The fourth mounting holes 22 are also arranged in a circular array with the axis of the second flange 2 as the center, so the fourth mounting holes 22 are outside the third mounting holes.

The first flange 1 is vertically arranged above the second flange 2 , the second mounting hole 12 is arranged corresponding to the fourth mounting hole 22 , and the limiting portion 4 passes through the second mounting hole 12 and the fourth mounting hole 22 .

The number of the limiting parts 4 is consistent with the number of the second mounting holes 12 or the fourth mounting holes 22. By providing at least three limiting parts 4, the first fixing ring 31 and the second fixing ring 32 are further limited to move outward.

As shown in Fig. 4, the limiting part 4 includes: a first bolt 41, a first nut 42 and a limiting sleeve 43. The first bolt 41 passes through the fourth mounting hole 22. The limiting sleeve 43 is sleeved on the outer wall of the first bolt 41 and is placed between the first flange 1 and the second flange 2. The top of the first bolt 41 extends out of the second mounting hole 12, and the first nut 42 is connected to the top of the first bolt 41. The first fixing ring 31 and the second fixing ring 32 are limited to move outward by the blocking of the limiting sleeve 43.

The position of the limiting part 4 and the number of more than three are mainly for the movement of the first fixing ring 31 and the second fixing ring 32. If the number of the limiting parts 4 is 1 or 2, the limiting sleeve 43 will not be able to block the movement of the first fixing ring 31 and the second fixing ring 32 during the displacement of the first fixing ring 31 and the second fixing ring 32.

The first nut 42 adjusts the distance between the limiting sleeve 43 and the bottom of the first flange 1 and the top of the second flange 2. The retracted size of the elastic telescopic part 3 is controlled by the distance between the top of the limiting sleeve 43 and the first flange 1 and the second flange 2 and by the blocking of the limiting sleeve 43 by the first flange 1 and the second flange 2.

The elastic expansion part 3 includes: a first fixing ring 31, a second fixing ring 32, a first elastic sheet 33, a second elastic sheet 34, a second bolt 35 and a second nut 36. The first fixing ring 31 is provided with a plurality of fifth mounting holes 37, the second fixing ring 32 is provided with a plurality of sixth mounting holes 38, one end of the first elastic sheet 33 is provided with a plurality of seventh mounting holes 39, the other end of the first elastic sheet 33 is fixedly connected to the first flange 1, one end of the second elastic sheet 34 is provided with a plurality of eighth mounting holes 310, the other end of the second elastic sheet 34 is fixedly connected to the second flange 2, the second bolt 35 passes through the sixth mounting hole 38, the eighth mounting hole 310, the seventh mounting hole 39 and the fifth mounting hole 37 in sequence, and the second nut 36 is threadedly connected with the second bolt 35 to closely fit the first elastic sheet 33 and the second elastic sheet 34. The first fixing ring 31 and the second fixing ring 32 are used to first seal and fix the ends of the first elastic sheet 33 and the second elastic sheet 34, and second limit the distance that the first elastic sheet 33 and the second elastic sheet 34 move outward under positive high pressure.

There is a gap between the limiting sleeve 43 and the outer wall of the first fixing ring 31 and the second fixing ring 32, and the limiting sleeve 43 limits the outward movement of the first fixing ring 31 and the second fixing ring 32. The gap between the limiting sleeve 43 and the outer wall of the first fixing ring 31 and the second fixing ring 32 limits the outward movement distance of the first elastic sheet 33 and the second elastic sheet 34 under positive high pressure.

The first elastic sheet 33 and the second elastic sheet 34 are made of PFA, FEP, ETFE or PTFE. The first elastic sheet 33 and the second elastic sheet 34 made of the above materials make the utility model have corrosion resistance and can be used in a corrosive environment.

The first elastic sheet 33 and the second elastic sheet 34 of the utility model are made of PFA, FEP, ETFE or PTFE, and therefore have the characteristics of corrosion resistance and high temperature resistance. Similarly, in the specific implementation process, the first elastic sheet 33 and the second elastic sheet 34 have arc-shaped transition surfaces to achieve expansion and contraction deformation. The properties of the material itself determine that the first elastic sheet 33 and the second elastic sheet 34 are not greatly deformed under positive and negative high pressure.

During use, under normal pressure, the positions of the first elastic sheet 33 and the second elastic sheet 34 do not change much, there is a gap between the limiting sleeve 43 and the outer walls of the first fixing ring 31 and the second fixing ring 32, and there is also a gap between the two ends of the limiting sleeve 43 and the first flange 1 and the second flange 2; in the case of positive high pressure, due to the increase of pressure in the pipeline, the first elastic sheet 33 and the second elastic sheet 34 expand outward, the first fixing ring 31 and the second fixing ring 32 are close to the limiting column, and the limiting column prevents the first fixing ring 31 and the second fixing ring 32 from continuing to move outward, thereby ensuring that the first elastic sheet 33 and the second elastic sheet 34 can work normally; in the case of negative high pressure, due to the decrease of pressure in the pipeline, the first elastic sheet 33 and the second elastic sheet 34 shrink inward, the first fixing ring 31 and the second fixing ring 32 are relatively far away from the limiting column, but the distance between the first flange 1 and the second flange 2 is reduced until the limiting column prevents the first flange 1 and the second flange 2 from continuing to approach relatively, thereby ensuring that the first elastic sheet 33 and the second elastic sheet 34 can work normally.

Due to the structural and material characteristics of the first elastic sheet 33 and the second elastic sheet 34, the first flange 1 and the second flange 2 with a diameter of 200 mm usually compensate for ±10 mm. If the distance to be compensated is greater than 20 mm, multiple of the present inventions need to be used in a stacked manner.

The above are only some embodiments of the present invention. It should be pointed out that for ordinary technicians in this field, other modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims (9)

1. Can bear anticorrosive expansion joint of high temperature and high positive negative pressure, its characterized in that includes: the device comprises a first flange, a second flange, an elastic expansion part and a limiting part, wherein the first flange is fixedly connected with the top of the elastic expansion part, the second flange is fixedly connected with the bottom of the elastic expansion part, the limiting part is connected between the first flange and the second flange, the limiting part limits the radial moving position of the elastic expansion part, and the elastic expansion part comprises: the novel elastic fixing device comprises a first fixing ring, a second fixing ring, a first elastic sheet, a second bolt and a second nut, wherein a plurality of fifth mounting holes are formed in the first fixing ring, a plurality of sixth mounting holes are formed in the second fixing ring, a plurality of seventh mounting holes are formed in one end of the first elastic sheet, the other end of the first elastic sheet is fixedly connected with a first flange, a plurality of eighth mounting holes are formed in one end of the second elastic sheet, the other end of the second elastic sheet is fixedly connected with a second flange, the second bolt sequentially penetrates through the sixth mounting holes, the eighth mounting holes, the seventh mounting holes and the fifth mounting holes, and the second nut is in threaded connection with the second bolt to tightly attach the first elastic sheet and the second elastic sheet.

2. The corrosion-resistant expansion joint capable of bearing high temperature and high positive and negative pressure according to claim 1, wherein a plurality of first mounting holes are formed in the first flange, the first mounting holes are distributed in an annular array with the axis of the first flange as the center of a circle, and at least 3 second mounting holes are formed in the outer side of the first mounting holes.

3. The corrosion-resistant expansion joint capable of bearing high temperature and high positive and negative pressure according to claim 2, wherein a plurality of third mounting holes are formed in the second flange, the third mounting holes are distributed in an annular array with the axis of the second flange as the center of a circle, and at least 3 fourth mounting holes are formed in the outer side of the third mounting holes.

4. The corrosion-resistant expansion joint capable of bearing high temperature and high positive and negative pressure according to claim 3, wherein the first flange is vertically arranged above the second flange, the second mounting hole is correspondingly arranged in the fourth mounting hole, and the limiting part penetrates through the second mounting hole and the fourth mounting hole.

5. The corrosion-resistant expansion joint capable of bearing high temperature and high positive and negative pressure according to claim 4, wherein the number of the limiting parts is equal to the number of the second mounting holes or the fourth mounting holes.

6. The corrosion-resistant expansion joint capable of withstanding high temperatures and high positive and negative pressures according to claim 5, wherein the limiting portion comprises: the first bolt passes through the fourth mounting hole, the stop collar is sleeved on the outer wall of the first bolt and is arranged between the first flange and the second flange, the top of the first bolt extends out of the second mounting hole, and the first nut is connected with the top of the first bolt.

7. The corrosion-resistant expansion joint capable of withstanding high temperatures and high positive and negative pressures as recited in claim 6, wherein the first nut adjusts the spacing between the stop collar and the first flange bottom and the second flange top.

8. The corrosion-resistant expansion joint capable of withstanding high temperatures and high positive and negative pressures as set forth in claim 7 wherein said stop collar has a gap with the outer walls of the first and second retainer rings, said stop collar defining outward movement of said first and second retainer rings.

9. The corrosion resistant expansion joint according to claim 8, wherein said first and second elastic sheets are made of PFA, FEP, ETFE or PTFE.