CN213515234U - Sealing gasket for heat exchanger - Google Patents

Abstract

A gasket seal for a heat exchanger, comprising: the inner gasket (6) comprises a first sealing layer (61) and a first protective layer (62) which are distributed along the thickness direction and connected; an outer gasket (7) which is annular and is provided on the periphery of the inner gasket (6), and which includes an annular second sealing layer (71) and an annular metal skeleton (72) embedded in the second sealing layer (71); the metal framework (72) is connected with the first protective layer (62) so as to connect the inner gasket (6) and the outer gasket (7). Compared with the prior art, the medium scouring resisting device is convenient to install and position, and can improve the medium scouring resisting capacity.

Description

Sealing gasket for heat exchanger

Technical Field

The utility model belongs to the technical field of it is sealed, concretely relates to seal gasket for heat exchanger.

Background

The structure of the conventional spiral plate heat exchanger is shown in fig. 1 and 2, and includes a cylindrical housing 1 ', flanges 2 ' provided on outer peripheral walls at both ends of the housing, end caps 3 ' provided at both ends of the housing, spiral plates 5 ' provided in the housing, and spacers 6 '. The spiral plate 5 'is provided with two spiral channels 10' which are coiled along the circumferential direction in the shell 1 'and are used for the heat exchange medium to flow along the spiral channels, and the two spiral channels 10' are separated to be respectively used for the circulation of the heat exchange medium A and the heat exchange medium B so as to realize the heat exchange. And the end cover 3 ' and the flange 2 ' are detachably connected through a fastener 4 ', the gasket 6 ' is a whole sealing structure which is arranged between the end cover 3 ' and the spiral plate 5 ' and the outer edge of the gasket 6 ' is tightly pressed between the flange 2 ' and the end cover 3 ' to realize sealing.

The existing gasket adopts an integrated non-asbestos pad, and has the following defects:

1. because the high-temperature resistance of the asbestos material is not limited, the structure is not suitable for a high-temperature heat exchange medium, such as 450 ℃; in the case where the heat exchange medium is oxidizing, the design temperature needs to be further reduced;

2. at present, the highest design pressure can not exceed 3.5MPa due to the strength relation of asbestos;

3. the non-asbestos material has relatively common wear resistance and cannot be used in occasions with relatively serious medium scouring;

4. because the sealing structure of the flange and the gasket can only be pre-tightened by fasteners such as studs, bolts and the like at the outer edge of the end cover, and the pre-tightening amount is attenuated from the edge of the end cover to the center, in order to ensure the pre-tightening amount of the center of the end cover, the integrated gasket needs larger pre-tightening force of the bolts, and further needs to greatly improve the rigidity of the flange and the strength of the fasteners (the flange and the end cover are thickened, the diameter or the number of the fasteners is increased), so that the construction cost; under high pressure conditions, this situation is more severe;

5. the requirements of the middle part and the outer edge of the gasket are required to be met simultaneously, the requirements on various performances of the gasket are high, and the gasket is high in manufacturing cost.

In order to overcome the defects of the integrated gasket, people design a split gasket structure with an inner gasket and an outer gasket which are distributed inside and outside, the split gasket can improve the sealing performance, but the inner gasket and the outer gasket are of split structures, so that the inner gasket and the outer gasket are difficult to install and position. And because the prior sealing gasket mostly adopts the asbestos-free material, the connection between the inner gasket and the outer gasket and the improvement of the connection strength are problems which need to be solved urgently.

Disclosure of Invention

The utility model discloses a first technical problem that will solve is to prior art's current situation, provides a seal gasket for heat exchanger convenient to installation and location.

The second technical problem to be solved by the utility model is to provide a seal gasket for heat exchanger that can improve anti-media scouring ability.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a seal gasket for heat exchanger, includes interior gasket and outer gasket, outer gasket is cyclic annular to locate the periphery of above-mentioned interior gasket, its characterized in that:

the inner gasket comprises a first sealing layer and a first protective layer which are distributed along the thickness direction and connected with each other;

the outer gasket comprises an annular second sealing layer and an annular metal framework arranged in the second sealing layer; the metal framework is connected with the first protective layer so as to connect the inner gasket and the outer gasket.

Preferably, a gap is formed between the outer gasket and the inner gasket, and the connecting piece is used for connecting the metal framework and the first protective layer and is arranged in the gap.

Preferably, the connecting piece is a connecting support lug, the connecting support lug is provided with at least two connecting support lugs which are distributed at intervals along the circumferential direction, the first end of each connecting support lug is connected with the metal framework of the outer gasket, and the second end of each connecting support lug is connected with the first protective layer.

In the scheme, the section of the metal framework is in a tooth shape or a wave shape. Therefore, the risk of displacement between the metal framework and the second sealing layer can be reduced.

In order to realize the positioning of the gasket, preferably, the outer edge of the metal framework of the outer gasket is provided with a positioning portion, the positioning portion is exposed outside the second sealing layer, and the positioning portion is provided with a positioning hole.

Furthermore, the positioning part is a metal piece integrally connected with the metal framework.

Compared with the prior art, the utility model has the advantages of: the sealing gasket is designed into an inner gasket and an outer gasket which are distributed inside and outside and connected with each other, and the inner gasket and the outer gasket respectively play their own roles, particularly, the inner gasket hardly has any influence on the compression of the outer gasket, so that the sealing gasket is very favorable for preventing a heat exchange medium in the heat exchanger from leaking; the inner gasket and the outer gasket can be respectively optimized according to heat exchange media and operation conditions, so that the requirements on the rigidity and the fastening piece of the flange on the heat exchanger are reduced to the maximum extent, and the cost is reduced; meanwhile, the inner gasket is designed into the composite gasket with the first sealing layer and the first protective layer, and the first protective layer can protect the first sealing layer from being washed by the heat exchange medium, so that the medium washing resistance of the inner gasket is improved, and the service life of the inner gasket is prolonged; by designing the outer gasket into a structure with the metal framework and the second sealing layer, the metal framework can improve the mechanical strength of the outer gasket and can be connected with the first protective layer of the inner gasket, so that the inner gasket and the outer gasket are firmly and stably connected, and the sealing gasket is convenient to mount and position; and the structure is simple, and the implementation is convenient.

Drawings

Fig. 1 is a sectional view showing a partial structure of a prior art spiral plate type heat exchanger;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a sectional view of a partial structure of a spiral plate heat exchanger according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of an embodiment of the invention;

fig. 5 is a top view of an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 3, 4 and 5, for a preferred embodiment of a sealing gasket for a heat exchanger of the present invention, the sealing gasket is used in the heat exchanger to seal a heat exchange medium, and the embodiment is specifically described in conjunction with the structure of the heat exchanger, specifically as follows: the heat exchanger is a spiral plate type heat exchanger and comprises a shell 1, a flange 2, an end cover 3, a spiral plate 5 and a sealing gasket.

The housing 1 is a hollow cylinder. Two flanges 2 are arranged at two ends of the shell 1 respectively. Two end covers 3 are respectively arranged at two ends of the shell 1, and each end cover 3 is detachably connected with the corresponding flange 2 through a fastening piece 4. In this embodiment, the flange 2 and the end cover 3 are both provided with axially extending connection holes, the fastener 4 includes a stud 41 and a nut 42 screwed on the stud 41, the stud 41 sequentially penetrates through the connection holes on the flange 2 and the end cover 3, and the flange 2 and the end cover 3 are connected by tightening the nut 42. The spiral plate 5 is arranged in the shell 1, the spiral plate 5 is provided with two spiral channels 10 which are coiled along the circumferential direction in the shell 1 and are used for the heat exchange medium to flow along, and each spiral channel 10 extends along the axial direction of the shell.

The sealing gasket of this embodiment comprises an inner gasket 6 and an outer gasket 7. The inner gasket 6 is a circular gasket, is disposed between the inner end surface of the end cover 3 and the axial end surface of the spiral plate 5, and is in sealing engagement with the axial end surface of the spiral plate 5 to close the spiral passage 10. Meanwhile, the inner gasket 6 includes a first sealing layer 61 and a first protection layer 62 which are distributed along the thickness direction (in this embodiment, the thickness direction is the axial direction of the casing) and connected with each other, and the first protection layer 62 is disposed between the first sealing layer 61 and the axial end face of the spiral plate 5. The first protective layer 62 is made of a material with good erosion resistance, such as a stainless steel sheet, or other metal or non-metal materials according to the corrosion of the heat exchange medium. In this embodiment, the first protective layer 62 is a thin metal plate. The first sealing layer 61 is made of flexible graphite and has good elasticity and high temperature resistance. The first sealant 61 and the first protective layer 62 may be connected by glue.

The outer gasket 7 is annular and is circumferentially arranged on the periphery of the inner gasket 6, and the outer gasket 7 is arranged between the sealing surface of the flange 2 and the inner end surface of the end cover 3 and is in sealing fit with the sealing surface of the flange 2 and the inner end surface of the end cover 3. In this embodiment, the outer gasket 7 includes an annular second sealing layer 71, and a metal skeleton 72 embedded in the second sealing layer 71, and the metal skeleton 72 has an annular shape. And the section of the metal framework 72 is in a tooth shape or a wave shape.

The outer gasket 7 and the inner gasket 6 have a gap therebetween, and are connected to each other by a connecting lug 8. The connecting lugs 8 are 4 and distributed at equal intervals along the circumferential direction, the first end of each connecting lug 8 is connected with the metal framework 72 of the outer gasket 7, and the second end of each connecting lug 8 is connected with the first protective layer 62 of the inner gasket 6. In this embodiment, the connecting lug 8 is made of metal, and both ends of the connecting lug are connected with the metal framework 72 and the first protective layer 62 by welding.

Meanwhile, in order to position the sealing gasket in the heat exchanger, two positioning portions 73 are disposed on the outer edge of the metal framework 72 of the outer gasket 7, each positioning portion 73 is exposed outside the second sealing layer 71 and is disposed corresponding to the stud 41, and a positioning hole 730 for the stud 41 to pass through is disposed on each positioning portion 73. In this embodiment, the positioning portion 73 is a metal piece and is integrally connected to the metal frame 72 by welding. Thus, the positioning hole 730 is matched with the stud 41 to realize the positioning of the outer gasket 7, and further realize the positioning of the inner gasket 6 connected with the outer gasket 7, so that a positioning structure is not required to be additionally arranged on the inner gasket 6.

Interior gasket 6 is used for sealed spiral passage in this embodiment, and outer gasket 7 is used for sealing flange 2 and end cover 3, so, compresses tightly outer gasket 7 through suitable pretightning force, can guarantee simultaneously that 3 edges of end cover all have suitable pretightning force with the middle part, and then realizes that interior gasket 6, outer gasket 7 homoenergetic seal spiral plate heat exchanger betterly.

Claims (6)

1. A seal gasket for heat exchanger, includes interior gasket (6) and outer gasket (7), outer gasket (7) are cyclic annular to locate the periphery of above-mentioned interior gasket (6), its characterized in that:

the inner gasket (6) comprises a first sealing layer (61) and a first protective layer (62) which are distributed along the thickness direction and connected with each other;

the outer gasket comprises an annular second sealing layer (71) and an annular metal framework (72) which is arranged in the second sealing layer (71); the metal framework (72) is connected with the first protective layer (62) so as to connect the inner gasket (6) and the outer gasket (7).

2. A gasket seal according to claim 1, wherein: a gap is formed between the outer gasket (7) and the inner gasket (6), and the connecting piece is used for connecting the metal framework (72) and the first protective layer (62) and is arranged in the gap.

3. A gasket seal according to claim 2, wherein: the connecting piece is connecting journal stirrup (8), and this connecting journal stirrup (8) have at least two and along circumference interval distribution, the first end of each connecting journal stirrup (8) with metal framework (72) of outer gasket (7) link to each other, the second end of each connecting journal stirrup (8) with first inoxidizing coating (62) link to each other.

4. A gasket seal according to claim 1, wherein: the section of the metal framework (72) is in a tooth shape or a wave shape.

5. A gasket seal according to claim 1, wherein: the outer edge of the metal framework (72) of the outer gasket (7) is provided with a positioning part (73), the positioning part (73) is exposed out of the second sealing layer (71), and the positioning part (73) is provided with a positioning hole (730).

6. A gasket seal according to claim 5, wherein: the positioning part (73) is a metal piece integrally connected with the metal framework (72).

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