CN215413298U - Heat exchanger - Google Patents

Abstract

The utility model discloses a heat exchanger, comprising: the heat exchange unit comprises a tube bundle, a first fixing disc and a second fixing disc which are hermetically fixed at two ends of the tube bundle, wherein the first fixing disc is hermetically connected between the first sealing cover and the first end of the outer cylinder through a mounting element; the first sealing element comprises a first main body and a first sealing lining layer coated on the outer surface of the first main body, the second sealing element comprises a second main body and a second sealing lining layer coated on the outer surface of the second main body, and the first sealing lining layer and the second sealing lining layer are respectively in face sealing with two end faces of the outer ring of the first fixed disc, so that the sealing performance of the heat exchanger is greatly improved.

Description

Heat exchanger

Technical Field

The utility model belongs to the technical field of heat exchange, and particularly relates to a heat exchanger.

Background

Japanese patent JP4680933B2 discloses a heat exchanger comprising a housing and a resin pipe, the end of the resin pipe forming a honeycomb structure having an outer diameter smaller than the inner diameter of the housing so that the honeycomb structure passes through the housing and the outer diameter of the honeycomb structure is compensated by an open ring; the shell-side end plate simultaneously abuts against the shell-side flange, the split ring and the shell-side mounting flange of the pressing honeycomb structure, the pipe-side end plate is fixed to the shell-side end plate by bolts, and the pipe-side mounting flange is fixed to the pipe-side end plate. The outer periphery of the shell-side flange and the inner ring of the shell-side end plate are sealed by the seal rings 41 and 42, and the outer periphery and the end of the honeycomb structure and the tube-side end plate are sealed by the seal rings 43 and 44. After the bolts are screwed down, the pipe side end plate simultaneously presses the shell side flange, the shell side end plate and the split ring to the shell side mounting flange, so that the honeycomb structure is positioned relative to the end part of the shell, the sealing fixation between the honeycomb structure and the pipe side end plate, between the shell side flange and the shell side end plate and between the pipe side end plate and the pipe side mounting flange is ensured, the mixing of the pipe side fluid and the shell side fluid is avoided, and the shell side flange of the honeycomb structure is firmly fixed by the shell side end plate, the split ring and the shell side mounting flange.

Because the sealing area provided by the sealing rings 41-44 is very limited, it is not guaranteed that a reliable seal can always be formed between the honeycomb structure and the shell-side end plate and the tube-side end plate. When the heat exchanger is applied to a working condition with high temperature or pressure, a leakage phenomenon can occur. Further, the operation of mounting a plurality of seal rings is also troublesome.

Therefore, there is a need for an improved sealing structure between the honeycomb structure of the end portions of the heat exchange tubes and the shell-side end plate and the tube-side end plate in the conventional heat exchanger, so as to achieve reliable sealing between the respective connection portions and simplify the mounting operation of the sealing member.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides the heat exchanger, wherein the contact sealing area between the heat exchange unit and the outer shell is large, and the sealing performance is reliable.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a heat exchanger, comprising: the outer cylinder is provided with two open ends and at least two pipe fittings on the side wall; the first sealing cover and the second sealing cover are hermetically fixed at two ends of the outer cylinder and respectively provided with at least one pipe fitting; the heat exchange unit is positioned in the outer barrel and comprises a tube bundle, a first fixed disk and a second fixed disk, wherein the first fixed disk and the second fixed disk are hermetically fixed at two end parts of the tube bundle; the maximum value of the outer diameter of the first fixed disc is smaller than the minimum value of the inner diameter of the outer cylinder, the first end of the heat exchange unit extends into the second end of the outer cylinder and extends out of the first end of the outer cylinder, and the first fixed disc is connected between the first sealing cover and the first end of the outer cylinder in a sealing mode through a mounting element; the mounting element at least comprises a first sealing element and a second sealing element which are clamped on two end faces of an outer ring area of the first fixed disc; the first sealing element comprises a first main body and a first sealing lining layer coated on the outer surface of the first main body; the second sealing element comprises a second main body and a second sealing lining layer coated on the outer surface of the second main body; the first sealing lining layer and the second sealing lining layer form face sealing with two end faces of the outer ring of the first fixed disc respectively.

In the heat exchanger provided by the utility model, the mounting element comprises a first sealing element and a second sealing element which firmly clamp the first fixed disk from two end surfaces of the first fixed disk of the heat exchange unit so as to avoid the first fixed disk from shifting; and, the elasticity of first sealing lining layer and the second sealing lining layer of first sealing element and second sealing element is greater than the elasticity of first fixed disk, all contact between the terminal surface of first sealing element inner circle and the terminal surface of second sealing element inner circle and two terminal surfaces of the outer lane of first fixed disk, support to lean on, and form face seal, the sealing area that its provided is greater than the sealing area that sealing washer among the prior art provided far away, the combination of two aspects effect, sealing performance between first fixed disk and first sealing element and the second sealing element improves by a wide margin, consequently, under higher temperature and pressure condition, also can provide reliable leakproofness all the time.

Furthermore, the first fixed disc is provided with an axial positioning section and a radial positioning section, and the outer diameter of the axial positioning section is larger than that of the radial positioning section; the end faces of the inner rings of the first sealing element and the second sealing element abut against two end faces of the axial positioning section, the inner wall of the second sealing element abuts against the outer peripheral face of the radial positioning section, and the end face of the outer ring area of the first sealing element and the end face of the outer ring area of the second sealing element abut against each other to form face seal.

The inner ring end face of the first sealing element and the inner ring end face of the second sealing element are respectively abutted against two end faces of the axial positioning section to form stable axial positioning for the first fixed disc, the inner wall of the second sealing element is abutted against the radial positioning section to form stable radial positioning for the first fixed disc, and a surface sealing effect is formed between corresponding contact surfaces and abutting surfaces; the surface sealing function is formed between the outer ring area of the first sealing element and the outer ring area of the second sealing element, namely, the double-surface sealing function is formed among the second sealing element, the first fixed disc and the first sealing element, the sealing performance is more reliable, and the tedious operation of additionally installing the sealing ring is omitted.

Further, the width of the contact area between the end face of the inner ring of the first sealing element and the end face of the axial positioning section is W, the difference between the outer diameters of the axial positioning section and the radial positioning section is 1/2 and D, and W is larger than D.

The contact that forms between the terminal surface of first sealing element inner circle and the terminal surface of the axial positioning section of first fixed disk, support to lean on the area big, improve axial positioning intensity and the leakproofness to first fixed disk.

Further, the first body and the first sealing liner, and the second body and the second sealing liner are made of the same material, and are made of fluorine-containing resin; or, the first main body and the second main body are made of metal materials, and the first sealing lining layer and the second sealing lining layer are fluorine-containing resin lining layers.

The first main body, the first sealing lining layer, the second main body and the second sealing lining layer are all made of fluorine-containing resin, and the sealing structure is convenient to process, good in overall corrosion resistance and reliable in sealing performance. Or the first main body and the second main body are made of metal materials, so that the hardness of the first sealing element and the second sealing element can be improved, the first fixing disc is firmly clamped, and the outer surfaces of the first main body and the second main body are provided with a first sealing lining layer and a second sealing lining layer which are made of fluorine-containing resin linings, so that the sealing performance between the first sealing element and the first fixing disc and between the second sealing element and the first fixing disc can be ensured.

Further, the thickness of the first sealing liner and the second sealing liner is 2-4 mm.

After the heat exchanger equipment is accomplished, the both ends face contact of first sealing element and second sealing element and axial positioning section, support and lean on, the first sealing liner of the two surface, the sealed liner of second all form sufficient compression deformation to all form the reliable face seal of intensity between the terminal surface of the both ends face at the axial positioning section and first sealing element and second sealing element's terminal surface, the sealing performance of heat exchanger improves greatly, also can ensure sealing performance reliably under the higher operating mode of temperature and pressure.

Furthermore, the first sealing element is annular and is provided with a first end face facing the first sealing cover and a second end face facing the second sealing cover, the first end face is flush everywhere, the second end face is a step face with thickness difference and comprises a first annular plane and a second annular plane which are perpendicular to the axial direction of the first sealing element, and a cylindrical surface which is located between the first annular plane and the second annular plane and is in perpendicular transition, and a face seal is formed between the second annular plane and the end face of the outer ring of the second sealing element.

The first annular plane with the planar step surface and the end face of the first fixed disc form surface sealing and axial positioning on the first fixed disc, and the second annular plane with the planar step surface and the end face of the outer ring of the second sealing element form surface sealing.

Further, at least 1/2 of the first annular plane abuts against the end face of the first fixed disk facing the first sealing cover.

The contact between the first sealing element and the first fixed disc can be ensured, and the sealing area is large enough, so that the sealing performance is reliable.

Furthermore, a gap is formed between the cylindrical surface and the outer surface of the axial positioning section, and the radial width of the gap is 4-8 mm.

The gap provides a deformation space for the thermal expansion of the first fixed disk, and the outer cylinder is prevented from being damaged when the first fixed disk is thermally expanded.

Further, the installation component still include with the first mounting flange that the urceolus links to each other, with third mounting flange and the fastener that first sealed lid links to each other, the outer lane of first sealing element and the outer lane of second sealing element all have a plurality of internal thread holes, the fastener will third mounting flange, first sealing element, second sealing element and first mounting flange fixed connection.

The fastener fixedly connects the third mounting flange, the first sealing element, the second sealing element and the first mounting flange, the first sealing element is clamped between the third mounting flange and the first fixing disc in a sealing mode, corresponding contact surfaces are compressed to form surface sealing, the second sealing element is clamped between the first mounting flange and the first fixing disc in a sealing mode, corresponding contact surfaces are compressed to form surface sealing, and therefore overall fixing and connecting effects are stable and sealing performance is reliable.

Further, second gaskets are arranged between the third mounting flange and the first sealing element, between the first sealing element and the second sealing element, and between the second sealing element and the first mounting flange.

The second gasket can further improve the sealing performance between adjacent contact surfaces and improve the overall sealing performance of the heat exchanger.

The utility model has the beneficial effects that: in the heat exchanger provided by the utility model, the mounting element comprises a first sealing element and a second sealing element which firmly clamp the first fixed disk from two end surfaces of the first fixed disk of the heat exchange unit so as to avoid the first fixed disk from shifting; and, the elasticity of first sealing lining layer and the second sealing lining layer of first sealing element and second sealing element is greater than the elasticity of first fixed disk, all contact between the terminal surface of first sealing element inner circle and the terminal surface of second sealing element inner circle and two terminal surfaces of the outer lane of first fixed disk, support to lean on, and form face seal, the sealing area that its provided is greater than the sealing area that sealing washer among the prior art provided far away, the combination of two aspects effect, sealing performance between first fixed disk and first sealing element and the second sealing element improves by a wide margin, consequently, under higher temperature and pressure condition, also can provide reliable leakproofness all the time.

Drawings

Fig. 1 and 2 are a perspective view and a sectional view of a heat exchanger provided in the present invention.

Fig. 3 is a partially enlarged view of a portion of fig. 2 where the first sealing cover and the mounting member are located.

Fig. 4 is a cross-sectional view of a first sealing member of the heat exchanger of fig. 2.

Fig. 5 is a cross-sectional view of a second sealing member of the heat exchanger of fig. 2.

Fig. 6 is a sectional view of a first fixed disk of the heat exchanger in fig. 2.

Wherein, 100-heat exchanger, 10-outer cylinder, 101-pipe fitting of outer wall of outer cylinder, 102-first end of outer cylinder, 103-second end of outer cylinder, 20-first sealing cover, 201-pipe fitting of first sealing cover, 202-resin lining, 30-second sealing cover, 301-pipe fitting of second sealing cover, 40-heat exchange unit, 401-pipe bundle, 41-first end of heat exchange unit, 51-first fixing disk, 510-axial positioning part, 511-radial positioning part, 52-second fixing disk, 520-flange, 53-first gasket, 54-second mounting flange, 55-fourth mounting flange, 70-mounting element, 701-first mounting flange, 702-third mounting flange, 703-fastening fitting, 704-second gasket, 71-first sealing element, 710-first body, 711-first sealing liner, 712-first end face, 713-second end face, 713A-first annular flat, 713B-second annular flat, 713C-cylindrical face, 714-void, 715-internally threaded hole on first sealing element, 72-second sealing element, 720-second body, 721-second sealing liner, 722-internally threaded hole on second sealing element.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 6, a heat exchanger 100 includes an outer tub 10 having a hollow inside, a first sealing cover 20 and a second sealing cover 30 sealingly fixed to both ends of the outer tub 10, and a heat exchange unit 40 located inside the outer tub 10. The outer barrel 10 defines open first and second ends 102 and 103 with a sidewall having at least two tubes 101. The first seal cover 20 is fixed at the first end 102 of the outer cylinder 10, the second seal cover 30 is fixed at the second end 103 of the outer cylinder 10 in a sealing manner, and the first seal cover 20 is provided with at least one pipe member 201, and the second seal cover 30 is provided with at least one pipe member 301.

In some embodiments, the number of the pipe members 101 on the side wall of the outer cylinder 10 may be 4, and two pipe members are located at two opposite sides and two ends of the outer cylinder 10, wherein two pipe members located at two ends of the outer cylinder 10 are used as an inlet and an outlet of the shell-side heat exchange fluid, and two pipe members located at the other two ends are used as outlets of the condensed gas and the liquid. Of course, the discharge ports for condensed gas and liquid are provided, as the case may be.

In addition, according to the corrosive condition of the shell-side fluid and the tube-side fluid, the outer cylinder 10 may be lined with PO and the first sealing cover 20 and the second sealing cover 30 may be lined with fluorine such as PFA to improve the durability of the heat exchanger as a whole and prolong the service life of the heat exchanger.

The heat exchange unit 40 includes a tube bundle 401 extending along the length direction of the outer tub 10 and composed of a plurality of heat exchange tubes, and a first fixed tray 51 and a second fixed tray 52 hermetically fixed to both end portions of the tube bundle 401, respectively. The middle part of the heat exchange tube penetrates through the baffle plate with a plurality of holes to separate the adjacent heat exchange tubes, so that the shell-side fluid can flow quickly, and the heat exchange rate is improved. The heat exchange tube, the first fixed disk 51 and the second fixed disk 52 are made of PTFE so as to meet the tolerance to corrosive fluid. The first fixed disk 51 and the second fixed disk 52 are both of a disk structure, and a plurality of openings for the heat exchange tubes to pass through are formed inside the first fixed disk and the second fixed disk, and the first fixed disk and the second fixed disk are made of fluorine-containing resin.

The maximum value of the outer diameter of the first fixed disk 51 is smaller than the minimum value of the inner diameter of the hollow inside of the outer cylinder 10, the outer diameter of the second fixed disk 52 is larger than the inner diameter of the outer cylinder 10, and a flange 520 is formed on the outer periphery of the second fixed disk 52. The second end 103 of the outer cylinder 10 is fixedly connected with a second mounting flange 54, the second seal cover 30 is fixedly connected with a fourth mounting flange 55, the flange 520 and the first gasket 53 are clamped between the second mounting flange 54 and the fourth mounting flange 55 and fixedly connected through screws, and therefore the second fixing disc 52, the second end 103 of the outer cylinder 10 and the second seal cover 30 are hermetically connected.

Taking the direction shown in fig. 2 as an example, the left end of the outer cylinder 10 is defined as the first end 102 of the outer cylinder 10, the right end of the outer cylinder 10 is defined as the second end 103 of the outer cylinder 10, and the end where the first fixed disk 51 of the heat exchange unit 40 is located is the first end 41 of the heat exchange unit 40. When assembled, the first end 41 of the heat exchange unit 40 extends into the second end 103 of the outer cylinder 10 and out of the first end 102 of the outer cylinder 10, and the first fixed disk 51 is sealingly connected between the first sealing cover 20 and the first end 102 of the outer cylinder 10 through the mounting member 70.

As shown in fig. 2 to 3, the mounting member 70 includes at least a first sealing member 71 and a second sealing member 72 which are held at both end surfaces of the outer ring area of the first fixed disk 51. As shown in fig. 4, the first sealing member 71 includes a first body 710 and a first sealing liner 711 covering an outer surface of the first body 710. The first sealing element 71 is a hollow annular member and has a first end face 712 and a second end face 713, the first end face 712 facing the first seal cover 20 and the second end face 713 facing the second seal cover 30. The first end face 712 is flush, and the second end face 713 is a stepped face with a thickness difference, and the thickness of the outer ring of the stepped face is greater than that of the inner ring, that is, the second end face 713 includes a first annular flat face 713A and a second annular flat face 713B perpendicular to the axial direction of the first seal element 71, and a cylindrical face 713C located between the first annular flat face 713A and the second annular flat face 713B, the cylindrical face 713C and the first annular flat face 713A and the second annular flat face 713B are vertically transited, and the second annular flat face 713B is located in a region where the thickness of the outer ring of the first seal element 71 is greater.

The first body 710 and the first sealing liner 711 may be made of the same material, which is fluorine-containing resin, that is, the outer surface of the first body 710 with a larger thickness is covered with the first sealing liner 711, and the thickness of the first sealing liner is 2-4 mm. Alternatively, the first body 710 is made of a metal material, such as 304 stainless steel, and the first sealing liner 711 is a fluorine-containing resin liner, and has a thickness of 2-4 mm.

As shown in fig. 5, the second sealing element 72 is a hollow annular member, and includes a second main body 720 and a second sealing liner 721 covering an outer surface of the second main body 720. The second main body 720 and the second sealing liner 721 may be made of the same material, which is fluorine-containing resin, and the second sealing liner 721 is coated on the outer surface of the second main body 720 with a larger thickness, which is 2-4mm thick. Alternatively, the second body 720 is made of a metal material, and the second sealing liner 721 is a fluorine-containing resin liner, and has a thickness of 2-4 mm.

The hardness of the first sealing liner 711 and the second sealing liner 721 is much less than that of the first fixed disk 51, the first fixed disk 51 is clamped between the first sealing element 71 and the second sealing element 72, and the first sealing liner 711 and the second sealing liner 721 can be elastically deformed when being contacted and pressed, so as to form surface sealing between the contacted and abutted end surfaces.

As shown in fig. 6, the first fixed disk 51 is a disk structure, and its outer ring forms an axial positioning portion 510 and a radial positioning portion 511, the former having an outer diameter larger than that of the latter, i.e., the outer peripheral surface of the axial positioning portion 510 protrudes from the outer peripheral surface of the radial positioning portion 511, and the transition of the two forms a stepped surface.

As shown in fig. 3, when the first seal member 71 and the second seal member 72 sandwich the first fixed disk 51, the inner wall of the second seal member 72 abuts on the outer peripheral surface of the radial positioning portion 511, thereby forming radial positioning for the first fixed disk 51. In addition, the end face of the inner ring of the second seal member 72 also contacts and abuts on the stepped surface between the axial positioning portion 510 and the radial positioning portion 511, that is, the end face of the inner ring of the second seal member 72 abuts on the end face of the first fixed disk 51 facing the second seal cover 30, and the end face of the inner ring of the first seal member 71 abuts on the end face of the first fixed disk 51 facing the first seal cover 20, thereby providing stable axial positioning for the first fixed disk 51. Moreover, since the outer surface of the first sealing member 71 is covered with the first sealing liner 711 and the outer surface of the second sealing member 72 is covered with the second sealing liner 721, the first sealing liner 711 and the second sealing liner 721 form surface sealing with the two end surfaces of the outer ring of the first fixed disk 51, more precisely, the first sealing liner 711 and the second sealing liner 721 form surface sealing with the two end surfaces of the axial positioning portion 510 of the first fixed disk 51. In addition, the end surface of the outer ring region of the first seal member 71 and the end surface of the outer ring region of the second seal member 72 also abut against each other, forming a surface seal structure. More specifically, a face seal is formed between the second annular flat surface 713B of the first seal member 71 and the end surface of the outer race region of the second seal member 72.

As shown in fig. 3, 1/2 of the difference in outer diameter between the axial positioning portion 510 and the radial positioning portion 511 of the first fixed disk 51 is D, the width of the area of contact of the end face of the inner ring of the first seal member 71 with the end face of the axial positioning portion 510 is W, where W > D, i.e., the inner ring of the first seal member 71 and the inner ring of the second seal member 72 are not in the same plane, there is a difference in height therebetween, the clamping action of the first seal member 71 and the second seal member 72 on the axial positioning portion 510 is more stable, the sealing area between the first annular plane 713A and the end face of the axial positioning portion 510 is also larger, and the sealing performance between the respective contact faces is further improved.

In some preferred embodiments, at least 1/2 of the first annular flat surface 713A abuts against the end surface of the first fixed disk 51 facing the first seal cover 20, i.e. W is not less than 1/2 of the radial width of the first annular flat surface 713A, so that the contact and abutting area between the first seal member 71 and the end surface of the first fixed disk 51 is sufficiently large.

In addition, in order to provide a space for thermal expansion deformation, particularly radial deformation, of the first fixed disk 51, a space 714 having a radial width of 4 to 8mm is formed between the cylindrical surface 713C and the outer surface of the axially positioning portion 510.

As shown in fig. 3-5, mounting member 70 further includes a first mounting flange 701 coupled to outer cartridge 10, a third mounting flange 702 coupled to the first seal cover, and a fastener fitting 703. The outer race of the first sealing element 71 has a plurality of internally threaded holes 715, the outer race of the second sealing element 72 also has a plurality of internally threaded holes 722, and the outer wall of the fastener fitting 703 has external threads matching the internal threads of the internally threaded holes 715, 722. When assembling, the fastening fitting 703 passes through the third mounting flange 702, the internally threaded hole 715 of the first sealing element 71, the internally threaded hole 722 of the second sealing element 72, and the first mounting flange 701 in this order, and then is fixed by bolts. Of course, the fastening fitting 703 may also be inserted through the first mounting flange 701, the internally threaded hole 722 of the second sealing element 72, the internally threaded hole 715 of the first sealing element 71, and the third mounting flange 702 in reverse order.

In other embodiments, in order to improve the cleanliness and medium resistance of the first seal cover 20 and the third mounting flange 702, and improve the sealing performance between the third mounting flange 702 and the first sealing member 71, the inner surface of the first seal cover 20 is lined with a PFA resin lining layer 202, and the PFA resin lining layer 202 integrally covers a partial region of the end surface of the third mounting flange 702 facing the outer tub 10. Similar to the first seal cover 20, the inner surface of the second seal cover 30 is also lined with a PFA resin lining layer which also covers a partial area of the end surface of the fourth mounting flange 55 toward the outer tub 10.

To further improve the sealing of the connection between adjacent components of mounting flange 70, second gaskets 704 may also be disposed between third mounting flange 702 and first sealing member 71, between first sealing member 71 and second sealing member 72, and between second sealing member 72 and first mounting flange 701, and second gaskets 704 may also be made of a fluorine-containing resin.

The foregoing detailed description is intended to illustrate and not limit the utility model, which is intended to be within the spirit and scope of the appended claims, and any changes and modifications that fall within the true spirit and scope of the utility model are intended to be covered by the following claims.

Claims (10)

1. A heat exchanger, comprising: the outer cylinder is provided with two open ends and at least two pipe fittings on the side wall; the first sealing cover and the second sealing cover are hermetically fixed at two ends of the outer cylinder and respectively provided with at least one pipe fitting; the heat exchange unit is positioned in the outer barrel and comprises a tube bundle, a first fixed disk and a second fixed disk, wherein the first fixed disk and the second fixed disk are hermetically fixed at two end parts of the tube bundle; the method is characterized in that: the maximum value of the outer diameter of the first fixed disc is smaller than the minimum value of the inner diameter of the outer cylinder, the first end of the heat exchange unit extends into the second end of the outer cylinder and extends out of the first end of the outer cylinder, and the first fixed disc is connected between the first sealing cover and the first end of the outer cylinder in a sealing mode through a mounting element; the mounting element at least comprises a first sealing element and a second sealing element which are clamped on two end faces of an outer ring area of the first fixed disc; the first sealing element comprises a first main body and a first sealing lining layer coated on the outer surface of the first main body; the second sealing element comprises a second main body and a second sealing lining layer coated on the outer surface of the second main body; the first sealing lining layer and the second sealing lining layer form face sealing with two end faces of the outer ring of the first fixed disc respectively.

2. The heat exchanger of claim 1, wherein: the first fixed disc is provided with an axial positioning section and a radial positioning section, and the outer diameter of the axial positioning section is larger than that of the radial positioning section; the end faces of the inner rings of the first sealing element and the second sealing element abut against two end faces of the axial positioning section, the inner wall of the second sealing element abuts against the outer peripheral face of the radial positioning section, and the end face of the outer ring area of the first sealing element and the end face of the outer ring area of the second sealing element abut against each other to form face seal.

3. The heat exchanger of claim 2, wherein: the width of the contact area between the end face of the inner ring of the first sealing element and the end face of the axial positioning section is W, the difference between the outer diameters of the axial positioning section and the radial positioning section is 1/2 which is D, and W is larger than D.

4. The heat exchanger according to claim 1 or 2, wherein: the first main body and the first sealing liner layer, and the second main body and the second sealing liner layer are made of the same material and are made of fluorine-containing resin; or, the first main body and the second main body are made of metal materials, and the first sealing lining layer and the second sealing lining layer are fluorine-containing resin lining layers.

5. The heat exchanger of claim 4, wherein: the first and second sealing liners have a thickness of 2-4 mm.

6. The heat exchanger of claim 2, wherein: the first sealing element is annular and is provided with a first end face facing the first sealing cover and a second end face facing the second sealing cover, the first end face is flush everywhere, the second end face is a step face with thickness difference and comprises a first annular plane and a second annular plane which are perpendicular to the axial direction of the first sealing element, and a cylindrical surface which is located between the first annular plane and the second annular plane and is in perpendicular transition, and a face seal is formed between the second annular plane and the end face of the outer ring of the second sealing element.

7. The heat exchanger of claim 6, wherein: at least 1/2 of the first annular plane abuts against the end face, facing the first sealing cover, of the first fixed disc.

8. The heat exchanger of claim 6, wherein: and a gap is formed between the cylindrical surface and the outer surface of the axial positioning section, and the radial width of the gap is 4-8 mm.

9. The heat exchanger of claim 1, wherein: the installation component still include with the first mounting flange that the urceolus links to each other, with third mounting flange and the fastener that first sealed lid links to each other, the outer lane of first sealing element and second sealing element's outer lane all have a plurality of internal thread holes, the fastener will third mounting flange, first sealing element, second sealing element and first mounting flange fixed connection.

10. The heat exchanger of claim 9, wherein: and second gaskets are arranged between the third mounting flange and the first sealing element, between the first sealing element and the second sealing element and between the second sealing element and the first mounting flange.

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