CN210292957U - Heat exchanger seal structure and heat exchanger - Google Patents

Abstract

The utility model provides a heat exchanger sealing structure and a heat exchanger, wherein the heat exchanger sealing structure comprises an external flange, an equipment flange, a tube shell, an octagonal gasket and a wave-shaped gasket positioned at the inner side of the octagonal gasket, and the tube shell forms a plurality of heat exchange tubes which are arranged in a circuitous way; first recess is seted up to external flange, and the second recess is seted up to the equipment flange, and the equipment flange sets up the surfacing layer of utensil third recess towards external flange's the ring surface to through the common centre gripping octagonal gasket of first recess and third recess, and the ring side of the common centre gripping wave form gasket of ring surface through surfacing layer and external flange, the heat exchange tube runs through the surfacing layer and flushes with the surface of surfacing layer. Through the utility model discloses, solved among the prior art because of the deformation problem that different subassemblies lead to because of self material physical properties difference, prevented effectively that the problem that the seal structure that adopts traditional rubber seal gasket to exist from becoming invalid to can be applicable to high temperature, high pressure and have the fluid medium of corrosion property and carry out heat transfer and handle.

Description

Heat exchanger seal structure and heat exchanger

Technical Field

The utility model relates to a heat exchanger technical field especially relates to a heat exchanger seal structure and a heat exchanger based on this heat exchanger seal structure.

Background

The heat exchanger is a common device in chemical industry and food production. When heat exchange is carried out, a fluid medium with higher temperature enters the shell provided with the heat exchange tubes from the end socket, and the side part of the shell is provided with a cooling water inlet pipe and a cooling water outlet pipe so as to cool the fluid medium with higher temperature in the heat exchange tubes through cooling water flowing in the shell and finally discharge the fluid medium with reduced temperature out of the heat exchanger from the end socket. Of course, the heat exchanger can realize the temperature reduction of the fluid medium and the temperature increase of the fluid medium, and the processes are similar to each other.

Heat exchangers in the prior art are usually provided with flanges and connected with bolts through the flanges to realize the isolation of cold and hot media and realize reliable assembly. Therefore, the reliability of the sealing structure of the heat exchanger is important. Chinese patent publication No. CN107966049A discloses a shell and tube heat exchanger. A gasket is arranged between a tube plate and a barrel in the tube type heat exchanger, and the connection is realized through two flanges. However, the prior art does not consider the deformation problem caused by the difference of material strength and expansion coefficient between the cylinder body and the tube plate made of metal, and the sealing failure is easily caused; meanwhile, only one flat gasket is arranged in the prior art, so that the defect of poor sealing in the actual use process is caused. Meanwhile, the tube type heat exchanger disclosed by the prior art is not suitable for severe occasions such as high temperature, high pressure and corrosive fluid media, and therefore cannot be applied to petrochemical complete equipment. Furthermore, the prior art such as CN22372044U also has similar drawbacks.

In view of the above, there is a need for an improved heat exchanger sealing structure and a heat exchanger based on the heat exchanger sealing structure in the prior art to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to disclose a heat exchanger seal structure and a heat exchanger based on this heat exchanger seal structure for solve a great deal of defect that the heat exchanger seal structure among the prior art exists, be used for especially solving among the traditional heat exchanger seal structure because of the deformation problem that self material physical property difference leads to, prevent that seal structure from becoming invalid, and can be applicable to high temperature, high pressure and have the fluid medium of corrosion property and carry out heat transfer processing, simultaneously the utility model discloses still disclose a heat exchanger based on this heat exchanger seal structure.

In order to achieve the first objective, the present invention discloses a sealing structure of a heater, including:

the heat exchange tube comprises an external flange, an equipment flange, a tube shell integrally connected with the equipment flange, an octagonal gasket and a wave-shaped gasket positioned on the inner side of the octagonal gasket, wherein the tube shell forms a plurality of heat exchange tubes which are arranged in a circuitous way;

first recess is seted up to external flange, the second recess is seted up to the equipment flange, the equipment flange sets up the surfacing layer of utensil third recess towards the torus of external flange, and passes through the octagonal gasket of the common centre gripping of first recess and third recess, the ring side of the common centre gripping wave form gasket of torus through surfacing layer and external flange simultaneously, the heat exchange tube runs through the surfacing layer and flushes with the surface of surfacing layer.

As a further improvement of the utility model, the wave-shaped gasket is provided with two semicircular through holes, and a stop strip is transversely arranged between the two semicircular through holes; the external flange is internally provided with a first cavity and a second cavity which are separated and axially symmetrical through a partition plate, the cross sections of the first cavity and the second cavity are equal to the shape of the semicircular through hole, the barrier strips at least cover the side surfaces of the partition plate, and the barrier strips are tightly attached to the side surfaces of the partition plate.

As a further improvement, the plurality of heat exchange tubes are respectively communicated with the first cavity and the second cavity after penetrating through the surfacing layer.

As a further improvement, the octagonal gasket of the common centre gripping of first recess and third recess forms the bottom clearance, the common centre gripping of the anchor ring of surfacing layer and external flange the wave form gasket.

As a further improvement, the cross section of first recess and third recess all is trapezoidal, and the side of eight corner spacer is the separation form with the bottom surface of first recess and the bottom surface of third recess.

As a further improvement of the utility model, the wave-shaped gasket positioned at the inner side of the octagonal gasket forms an annular gap with the octagonal gasket in the radial direction.

As a further improvement of the present invention, the corrugated gasket is formed with a metal skeleton having a fourth groove on the surface, a filling layer filling the fourth groove, and a graphite layer from inside to outside; the filling layer is made of carbon fibers and is bonded with the graphite layer.

As a further improvement of the utility model, two adjacent fourth grooves form a peak, and the peak is partially embedded into the graphite layer.

As a further improvement, the equipment flange and the shell are made of carbon steel, and the surfacing layer and the external flange are made of stainless steel.

In order to realize another above-mentioned purpose, the utility model also discloses a heat exchanger, include:

the external flange, the equipment flange and the pipe shell integrally connected with the equipment flange;

a heat exchanger sealing structure of any one of the utility model is arranged between the external flange and the equipment flange;

the shell is internally provided with baffle plates which are arranged in a staggered manner and are penetrated by the heat exchange tubes, the external flange is connected with the first fluid medium input tube and the first fluid medium output tube, and a first fluid medium circulation channel which is isolated from the heat exchange tubes is formed by the first fluid medium input tube and the first fluid medium output tube;

the side wall of the tube shell is provided with a second fluid medium input tube and a second fluid medium output tube, and an isolated second fluid medium circulation channel is formed between the second fluid medium input tube and the second fluid medium output tube and the tube shell;

the first fluid medium circulation channel and the second fluid medium circulation channel are isolated from each other.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses in, through the ring side of the common centre gripping waveform gasket of the interior wave form gasket of octagonal gasket and surfacing layer and external flange's the torus through octagonal gasket and being located octagonal gasket, and run through the heat exchange tube surfacing layer and with the technical scheme that the surface of surfacing layer flushes, the deformation problem that leads to because of self material physical property difference among the traditional heat exchanger seal structure because of different subassemblies has been solved, the problem of inefficacy appears in the seal structure that has prevented effectively to adopt traditional rubber seal gasket to exist, and can be applicable to high temperature, high pressure and the fluid medium who has corrosion property carries out heat transfer processing.

Drawings

Fig. 1 is an exploded view of a heat exchanger equipped with the heat exchanger sealing structure of the present invention;

FIG. 2 is an axial cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 indicated by the reference character B;

FIG. 4 is an exploded view of the heat exchanger shown in FIG. 1 from another perspective;

FIG. 5 is an assembled view of the disclosed heat exchanger from a top view;

fig. 6 is a perspective view of a wave-tooth gasket in the sealing structure of the heat exchanger of the present invention;

fig. 7 is a schematic cross-sectional view of an octagonal gasket in the sealing structure of the heat exchanger of the present invention;

FIG. 8 is a left side view of the heat exchanger shown in FIG. 2;

fig. 9 is a front view of a corrugated tooth gasket in the sealing structure of the heat exchanger of the present invention;

FIG. 10 is a cross-sectional view taken along line C-C of FIG. 9;

fig. 11 is a schematic cross-sectional view perpendicular to the longitudinal extension of the tube shell of the heat exchanger;

fig. 12 is a cross-sectional view taken along line C-C in fig. 9 in a modification.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", "positive", "negative", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

The first embodiment is as follows:

please refer to fig. 1 to fig. 11, which illustrate a specific embodiment of the sealing structure of the heat exchanger of the present invention.

In this embodiment, the heat exchanger seal structure includes: external flange 1, equipment flange 4, the tube 5 of being connected with 4 integral types of equipment flange, eight corner pad piece 3 and be located eight corner pad piece 3 inboard wave form gasket 2, tube 5 forms a plurality of heat exchange tubes 7 of circuitous arranging. The external flange 1 is provided with a plurality of through holes 11 which are axially symmetrically arranged, and the equipment flange 4 is provided with a plurality of through holes 41 which are matched with the through holes 11. The bolts 42 are inserted when the external flange 1 is axially assembled with the equipment flange 4. The through hole 11 is internally threaded with the inner wall surface of the through hole 41 and is screwed and fixed to the bolt 42. The both ends tip of bolt 42 extends the lateral part of external flange 1 and equipment flange 4 respectively to assemble nut 43, with the longitudinal displacement of two nuts 43 restriction external flange 1 and equipment flange 4, with eight corner spacer 3 of reliable centre gripping and wave form gasket 2.

Specifically, the equipment flange 4 and the shell 5 are made of carbon steel, and the surfacing layer 9 and the external flange 1 are made of stainless steel. Referring to fig. 1, 3 and 4, the external flange 1 is provided with a first groove 12, the equipment flange 4 is provided with a second groove 40, the equipment flange 4 is provided with a surfacing layer 9 with a third groove 91 facing to the annular surface 101 of the external flange 1, the first groove 12 and the third groove 91 jointly clamp the octagonal gasket 3, and the surfacing layer 9 and the annular surface 101 of the external flange 1 jointly clamp the annular side surface of the corrugated gasket 2. The first groove 12 is disposed opposite to the second groove 40, the third groove 91 is disposed in the same direction as the second groove 40, and the third groove 91 is disposed opposite to the first groove 12.

The heat exchange tube 7 penetrates through the surfacing layer 9 and is flush with the surface of the surfacing layer 9, and specifically is flush with a circular ring surface 92 formed by the surfacing layer 9 facing the external flange 1. The cross sections of the first groove 12, the second groove 40 and the third groove 91 are trapezoidal, and the included angle between the side surfaces of the first groove 12 and the third groove 91 and the axis of the pipe shell 5 in the horizontal direction is equal to the included angle between the four inclined surfaces 31 of the octagonal gasket 3 and the horizontal plane, and is 23.5 degrees. Therefore, the four inclined planes 31 of the octagonal gasket 3 are in annular surface contact with the first groove 12 and the third groove 91, so that the octagonal gasket 3 can be clamped by the octagonal gasket 3 and the surfacing layer 9 in the horizontal axial direction, and the sealing effect is increased.

The first groove 12 and the third groove 91 together clamp the octagonal gasket 3 and form a bottom gap 25. The cross sections of the first groove 12 and the third groove 91 are trapezoidal, and the side surface of the octagonal gasket 3 is separated from the bottom surface of the first groove 12 and the bottom surface of the third groove 91. The wave-shaped gasket 2 is clamped by the surfacing layer 9 and the circular ring surface 101 of the external flange 1 together.

Referring to fig. 3, in the present embodiment, the octagonal gasket 3 is annular and is disposed on the radial outer side of the corrugated gasket 2, and the octagonal gasket 3 and the corrugated gasket 2 are located in the same cross section, so that the longitudinal dimension of the entire sealing structure formed by the octagonal gasket 3 and the corrugated gasket 2 (note: the longitudinal direction refers to the direction along the longitudinal extension direction of the pipe shell 5, and is spatially perpendicular to the term "radial direction" which is mentioned later to indicate a spatial position relationship) is greatly reduced, thereby further reducing the longitudinal connection length of the external flange 1 and the equipment flange 4 through the bolts 42 and the nuts 43, and further improving the reliability and the sealing performance of the sealing structure of the heat exchanger. In the various embodiments of the present application, the term "longitudinal" is synonymous with the terms "axial" and "horizontal".

In this embodiment, the bottom gap 25 formed between the overlay welding layer 9 and the external flange 1 is adjusted by rotating the nut 43, and the width (i.e., the dimension in the horizontal direction) of the bottom gap 25 is controlled to flexibly adjust the sealing performance of the heat exchanger sealing structure, so as to meet the heat exchange requirements of different types of first fluid media, thereby further improving the adaptability and application scenarios of the heat exchanger sealing structure.

A first fluid medium, which may be water, lubricating oil or an olefin cracking product in a petrochemical plant (e.g., diesel oil, gasoline, jet kerosene, heavy oil, etc.), circulates in the heat exchange tubes 7. The equipment flange 4 and the pipe shell 5 in the embodiment are made of carbon steel, so that the equipment flange 4 and the pipe shell 5 can bear large load or stress and have good mechanical properties. However, if the first fluid medium is a corrosive fluid, it is possible to isolate the device flange 4 and the housing 5 from each other by means of the corrugated gasket 2 and to pass the corrosive fluid directly into the external flange 1 made of stainless steel.

Meanwhile, in the present embodiment, since the heat exchange tube 7 penetrates through the weld overlay 9 and is flush with the surface of the weld overlay 9, the first fluid medium subjected to heat exchange is connected to external pipelines through the first cavity 10a and the second cavity 10b, respectively, after flowing through the heat exchange tube 7 arranged inside the shell 5 in a circuitous manner (as will be understood in conjunction with the third embodiment). The temperatures of the first fluid medium stored in the first chamber 10a and the second chamber 10b are different from each other by a certain temperature difference due to heat exchange. The overlaying layer 9 is made of stainless steel with the metal mark SUS316L, and forms an integral structure with the annular surface 44 of the equipment flange 4 facing the external flange 1 by adopting an overlaying process, and is arranged in a mode of axially protruding out of the annular surface 44 of the equipment flange 4.

Specifically, in this embodiment, the external flange 1 may be made of stainless steel with a metal designation of SUS316L, and the equipment flange 4 and the case 5 may be made of high-carbon steel or medium-carbon steel. SUS316L stainless steel has a high electrical resistivity, about 5 times that of carbon steel; meanwhile, SUS316L stainless steel has a larger linear expansion coefficient than carbon steel, 40% larger than carbon steel, and the value of the linear expansion coefficient increases accordingly as the temperature increases. SUS316L stainless steel also has a low thermal conductivity, about one third of carbon steel. Therefore, when the heat exchanger sealing structure is arranged in a heat exchanger and heat exchange is carried out on a first fluid medium, the physical properties of two materials can be considered, longitudinal linear expansion of the external flange 1 facing the waveform gasket 2 is prevented, and the sealing structure is always kept to have a good sealing effect.

Meanwhile, because the material of the external flange 1 is different from that of the equipment flange 4, the surfacing welding layer 9 is skillfully arranged on the end face, facing the external flange 1, of the equipment flange 4 by adopting the surfacing welding process, so that the corrosion phenomenon of the end face of the equipment flange 4 caused by the first fluid medium which flows in the heat exchange tube 7 and has corrosion property is avoided; meanwhile, by arranging the surfacing layer 9, the effect of buffering axial stress generated by asynchronous linear expansion caused by different materials of the external flange 1 and the equipment flange 4 is achieved, so that the sealing effect and the reliability of the sealing structure of the heat exchanger are further ensured.

Referring to fig. 6, in the present embodiment, the wave washer 2 is formed with two semicircular through holes, namely a semicircular through hole 21 and a semicircular through hole 22, a stop 23 is disposed between the two semicircular through holes, and the stop 23 and the wave washer 2 are formed in an integral structure. The inner part of the circumscribed flange 1 is provided with a partition plate 19 to form a first cavity 10a and a second cavity 10b which are separated and are axially symmetrical. The cross sections of the first cavity 10a and the second cavity 10b are equal to the shapes of the semicircular through holes 21 and the semicircular through holes 22, the stop bar 23 at least covers the side surface of the partition plate 19, and the stop bar 23 is tightly attached to the side surface of the partition plate 19. The plurality of heat exchange tubes 7 penetrate through the surfacing layer 9 and are respectively communicated with the first cavity 10a and the second cavity 10 b. Specifically, the width of the stop 23 is greater than or equal to the thickness of the side of the partition 19 in the vertical direction at the angle shown in fig. 2.

Through the structure, the first fluid medium flowing into the plurality of heat exchange tubes 7 in the area M in fig. 11 flows into the heat exchange tubes 7 only through the first cavities 10a and the circular through holes 21, and the first fluid medium with reduced temperature or increased temperature flows into the second cavities 10b only from the semicircular through holes 22 through the plurality of heat exchange tubes 7 in the area N, so that the first fluid medium is prevented from contacting the equipment flange 4 and the shell 5 made of carbon steel, and the service lives of the equipment flange 4 and the shell 5 are prolonged. At the same time, the first fluid medium is confined by the corrugated gasket 2 to avoid lateral leakage of the first fluid medium and contact with the device flange 4 and the cartridge 5.

Referring to fig. 3, in the present embodiment, the wave-shaped gasket 2 located inside the octagonal gasket 3 forms an annular gap 24 with the octagonal gasket 3 in the radial direction. Therefore, the wave-shaped gasket 2 has certain deformation allowance in the radial direction, and the sealing structure of the whole heat exchanger is more reliable.

Referring to fig. 9 and 10, in the present embodiment, the corrugated gasket 2 is formed with a metal skeleton 203 having a fourth groove 213 on the surface, a filling layer 202 filling the fourth groove 213, and a graphite layer 201 from the inside to the outside. The filling layer 202 is made of carbon fiber, and the filling layer 202 is bonded to the graphite layer 201. The metal frame 203 is made of stainless steel of metal designation SUS 316L. Specifically, in the present embodiment, the thickness of the graphite layer 201 is 0.5 to 1 mm. By integrally coating the graphite layer 201 on the outer side of the metal framework 203 of the fourth groove 213, the corrugated gasket 2 is guaranteed to have a sufficiently high structural strength, and the corrosion of the first corrosive fluid medium stored in the first cavity 10a and the second cavity 10b to the octagonal gasket 3 is effectively prevented by utilizing the characteristic that graphite has good chemical stability. Meanwhile, since the graphite has a relatively soft physical property, when the heat exchanger sealing structure leaks slightly, the axial distance between the surfacing layer 9 and the external flange 1 can be shortened properly by rotating the two nuts 43, so as to improve the axial clamping force, thereby effectively preventing the first fluid medium from permeating from the sealing surface formed between the side surface of the wave-shaped gasket 2 and the annular surface 92 of the surfacing layer 9 and the sealing surface formed between the wave-shaped gasket 2 and the external flange 1.

The heat exchanger sealing structure disclosed by the embodiment solves the problem of deformation caused by the difference of physical properties of materials of different components in the traditional heat exchanger sealing structure, effectively prevents the problem of failure of the sealing structure existing in the traditional rubber sealing gasket, and can be suitable for heat exchange treatment of high-temperature and high-pressure fluid media with corrosion properties.

Example two:

referring to fig. 12, this embodiment shows a modified embodiment of the sealing structure of the heat exchanger of the present invention.

The main difference between this embodiment and the heat exchanger sealing structure disclosed in the first embodiment is that, in this embodiment, two adjacent fourth grooves 213 form peaks 2131, and the peaks 2131 are partially embedded in the graphite layer 201 a.

In particular, the fourth groove 213 and the peak 2131 shown in this embodiment may be annularly arranged on the circular ring surface of the metal framework 203 in a concentric circle manner, may be arranged on the circular ring surface of the metal framework 203 in a concentric ray manner, may be arranged on the circular ring surface of the metal framework 203 in a spiral manner, or may be arranged in other equivalent arrangements. Through the technical scheme, the contact area between the filling layer 202 and the graphite layer 201 is further increased, so that the bonding strength between the filling layer 202 and the graphite layer 201 is increased, and the phenomenon that the filling layer 202 and the graphite layer 201 are stripped is effectively prevented.

The sealing structure of the heat exchanger shown in this embodiment and the technical solutions of the same parts in the first embodiment are described with reference to the first embodiment, and are not described herein again.

Example three:

referring to fig. 1, 2, 4 and 5, the present embodiment discloses a heat exchanger, which includes: the device comprises an external flange 1, a device flange 4 and a pipe shell 5 integrally connected with the device flange 4. A heat exchanger sealing structure as described in the first and/or second embodiments is provided between the external flange 1 and the equipment flange 4. The shell 5 is internally provided with a baffle plate 6 which is arranged in a staggered way and is used for the heat exchange tube 7 to penetrate through. The external flange 1 is connected with a first fluid medium input pipe 14 and a first fluid medium output pipe 17, and forms an isolated first fluid medium circulation channel with the heat exchange pipe 7 through the first fluid medium input pipe 14 and the first fluid medium output pipe 17. The side wall of the tube shell 5 is provided with a second fluid medium input pipe 51 and a second fluid medium output pipe 53, and a second fluid medium circulation passage isolated from the tube shell 5 is formed through the second fluid medium input pipe 51 and the second fluid medium output pipe 53. The first fluid medium circulation channel and the second fluid medium circulation channel are isolated from each other.

Referring to fig. 1 and 2, in the present embodiment, the tube housing 5 has a shielding cavity 50 therein. The second fluid medium inlet pipe 51 and the second fluid medium outlet pipe 53 are both communicated with the shielding cavity 50. The second fluid medium supply pipe 51 is provided at its end with a flange 52 and the second fluid medium discharge pipe 53 is provided at its end with a flange 54 for connection via the flange 52 and the flange 54 to external piping (not shown). Meanwhile, the end of the pipe shell 5 far away from the equipment flange 4 is also provided with a residue discharge pipe communicated with the shielding cavity 50, and the end of the residue discharge pipe is provided with a valve 55. The second fluid medium stored in the screened cavity 50 can be removed from the shell tube 5 by opening the valve 55 when the heat exchanger is serviced.

A typical heat exchange process for a fluid medium based on the heat exchanger will be briefly described below.

The interior of the circumscribing flange 1 forms a channel 13 for the inflow of the first fluid medium and a channel 16 for the outflow of the first fluid medium. The channel 13 extends outside the external flange 1 via a first fluid medium inlet pipe 14, and the channel 16 extends outside the external flange 1 via a first fluid medium outlet pipe 17. The first fluid medium supply line 14 is provided at its end with a flange 15 and the first fluid medium discharge line 17 is provided at its end with a flange 18. The passage 13 communicates with the first chamber 10a, and the passage 16 communicates with the second chamber 10 b. The first fluid medium of higher temperature flows into the first cavity 10a through the passage 13 in the direction of the arrow D in fig. 2, passes through the semicircular through holes 21 into the shell tube 5, undergoes heat exchange through the heat exchange tubes 7 arranged circuitously inside the shell tube 5, so that the temperature of the first fluid medium is lowered, flows into the second cavity 10b from the semicircular through holes 22, and finally flows out of the heat exchanger through the passage 16 in the direction of the arrow E. The cooling water (i.e., the second fluid medium) flows into the shielding cavity 50 of the tube shell 5 through the second fluid medium input pipe 51 along the direction of the arrow G, cools the first fluid medium flowing in the heat exchanging pipe 7 in a counter-current manner, and finally flows out of the tube shell 5 from the second fluid medium output pipe 53 along the direction of the arrow F. Thereby completing a complete heat exchange process to implement the cooling treatment of the first fluid medium flowing in the heat exchange pipe 7 by the cooling water (i.e. the above-mentioned second fluid medium).

It should be noted that, the heat exchanger disclosed in this embodiment may implement a temperature reduction process on the first fluid medium, and may also implement a temperature increase process on the first fluid medium.

Meanwhile, the heat exchanger shown in the embodiment is a shell and tube heat exchanger, and of course, a plate heat exchanger or various other types of heat exchangers can be used, and corresponding beneficial effects can be achieved by adopting a structure similar to the heat exchanger sealing structure disclosed in the first embodiment and/or the second embodiment.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. Heat exchanger seal structure, its characterized in that includes:

the heat exchanger comprises an external flange (1), an equipment flange (4), a pipe shell (5) integrally connected with the equipment flange (4), an octagonal gasket (3) and a wave-shaped gasket (2) positioned on the inner side of the octagonal gasket (3), wherein the pipe shell (5) forms a plurality of heat exchange pipes (7) which are arranged in a circuitous manner;

first recess (12) are seted up in external flange (1), second recess (40) are seted up in equipment flange (4), equipment flange (4) set up surfacing layer (9) of utensil third recess (91) towards torus (101) of external flange (1), and pass through first recess (12) and third recess (91) centre gripping aniseed gasket (3) jointly, the torus side of centre gripping wave form gasket (2) jointly through torus (101) of surfacing layer (9) and external flange (1) simultaneously, heat exchange tube (7) run through surfacing layer (9) and flush with the surface of surfacing layer (9).

2. The heat exchanger sealing structure according to claim 1, characterized in that the wave washer (2) forms two semicircular through holes between which a barrier strip (23) is disposed; the inner portion of the external flange (1) is provided with a partition plate (19) to form a first cavity (10a) and a second cavity (10b) which are separated and axially symmetrical, the cross sections of the first cavity (10a) and the second cavity (10b) are equal to the shape of the semicircular through hole, the stop strip (23) at least covers the side face of the partition plate (19), and the stop strip (23) is tightly attached to the side face of the partition plate (19).

3. The heat exchanger sealing structure according to claim 2, wherein the plurality of heat exchange tubes (7) are respectively communicated with the first cavity (10a) and the second cavity (10b) after penetrating the surfacing layer (9).

4. The heat exchanger sealing structure according to any one of claims 1 to 3, characterized in that the first groove (12) and the third groove (91) together clamp an octagonal gasket (3) and form a bottom gap (25), and the weld overlay (9) and the annular surface (101) of the circumscribing flange (1) together clamp the corrugated gasket (2).

5. The heat exchanger sealing structure according to claim 4, characterized in that the cross sections of the first groove (12) and the third groove (91) are trapezoidal, and the side surfaces of the octagonal gasket (3) are separated from the bottom surfaces of the first groove (12) and the third groove (91).

6. The heat exchanger sealing structure according to claim 4, characterized in that the wave-shaped gasket (2) located inside the octagonal gasket (3) forms an annular gap (24) with the octagonal gasket (3) in the radial direction.

7. The heat exchanger sealing structure according to claim 4, characterized in that the corrugated gasket (2) is provided with a metal skeleton (203) with a fourth groove (213) on the surface, a filling layer (202) filling the fourth groove (213) and a graphite layer (201) from inside to outside; the filling layer (202) is made of carbon fibers, and the filling layer (202) is bonded with the graphite layer (201).

8. The heat exchanger sealing structure according to claim 7, characterized in that adjacent two fourth grooves (213) form a peak (2131), said peak (2131) being partially embedded in said graphite layer (201).

9. The heat exchanger seal structure according to claim 4, characterized in that the equipment flange (4) and the shell case (5) are made of carbon steel, and the weld overlay (9) and the circumscribing flange (1) are made of stainless steel.

10. A heat exchanger, comprising:

the device comprises an external flange (1), an equipment flange (4) and a pipe shell (5) integrally connected with the equipment flange (4);

a heat exchanger sealing structure according to any one of claims 1 to 9 is arranged between the external flange (1) and the equipment flange (4);

the shell (5) is internally provided with baffle plates (6) which are arranged in a staggered manner and are penetrated by the heat exchange tubes (7), the external flange (1) is connected with a first fluid medium input tube (14) and a first fluid medium output tube (17), and a first isolated fluid medium circulation channel is formed with the heat exchange tubes (7) through the first fluid medium input tube (14) and the first fluid medium output tube (17);

a second fluid medium input pipe (51) and a second fluid medium output pipe (53) are arranged on the side wall of the pipe shell (5), and an isolated second fluid medium circulation channel is formed with the pipe shell (5) through the second fluid medium input pipe (51) and the second fluid medium output pipe (53);

the first fluid medium circulation channel and the second fluid medium circulation channel are isolated from each other.

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