Heat exchange unit and air preheater

Abstract

The utility model discloses a heat exchange unit which comprises a frame structure, a plurality of heat exchange plate tubes and a plurality of sealing clamping strips, and the heat exchange plate tubes and the sealing clamping strips are arranged in the frame structure. The two panels are oppositely arranged in the first direction of the thickness direction of the heat exchange plate tube, the side baffles are oppositely arranged in the second direction parallel to the front sealing plate and located between the two panels, a heat exchange channel is defined by the panels and the side baffles, and the multiple sealing clamping strips are connected to the two sides of the heat exchange plate tube in the second direction in a clamped mode respectively. The multiple heat exchange plate tubes are integrated into the heat exchange unit, so that the heat exchange plate tubes are more convenient to mount and replace, and the panels are limited to move away from the side baffles through the multiple sealing clamping strips, so that leakage caused by gaps between the panels and the side baffles is reduced. The utility model further discloses the air preheater comprising the heat exchange unit.

Description

Technical Field

[0001] The utility model relates to an air-to-air heat exchange technology, in particular to an air preheater and a heat exchange unit used for air-to-air heat exchange. Background Art

[0002] An air-to-air heat exchanger is required in a flue gas waste heat recovery device or a flue gas cooling device to realize heat exchange between flue gas and air. Depending on different application scenarios, such an air-to-air heat exchanger can be, for example, an air preheater and a flue gas air cooler.

[0003] At present, non-metallic heat exchanger plate tubes are installed and disassembled separately. Due to the long length of the heat exchanger plate tubes and the limited upper and lower space, it is time-consuming to replace a single one. In addition, during the replacement process, the new heat exchanger plate tube is easy to touch other old heat exchanger plate tubes that do not need to be replaced but are in place, which may cause secondary damage and is not easy to operate. In addition, the upper and lower panels of the plate-tube air preheater in the prior art are connected to the side baffles or the middle support strips by adhesives to form a closed fluid channel. Although the selected adhesive has high temperature resistance and corrosion resistance, when the plate tubes are in a high temperature and corrosive flue gas environment for a long time, the probability of aging of the adhesive will increase. Once the adhesive ages, a gap will appear between the upper and lower panels and the side baffles. On the other hand, the positive pressure air in the tube and the negative pressure flue gas outside the tube will make the gap larger and larger, thereby increasing the leakage rate. Utility Model Content

[0004] The purpose of the utility model is to provide a heat exchange unit and an air preheater, so as to at least partially overcome the deficiencies in the prior art.

[0005] According to one aspect of the utility model, a heat exchange unit is provided, the heat exchange unit comprising: a frame structure, the frame structure comprising a front sealing plate and a rear sealing plate arranged opposite to each other and a support member connected therebetween, the front sealing plate and the rear sealing plate respectively having a plurality of first mounting holes and a plurality of second mounting holes opposite to each other; a plurality of heat exchange plate tubes, the heat exchange plate tubes being flat hollow tubes, the flat hollow tubes comprising two panels arranged opposite to each other in a first direction along the thickness direction thereof and a side baffle plate arranged opposite to each other in a second direction parallel to the front sealing plate and located between the two panels, the panels and the side baffle plate enclosing a heat exchange channel, the heat exchange plate tube having an inlet end and an outlet end in a third direction perpendicular to the first direction and the second direction, the inlet end and the outlet end being respectively mounted in the first mounting hole and the second mounting hole, wherein at least one side baffle plate is separate from at least one panel and is sealed and connected; a plurality of sealing clips, the plurality of sealing clips being respectively clamped on both sides of the heat exchange plate tube along the second direction, for limiting the panel from moving away from the side baffle plate.

[0006] In some embodiments, the sealing clip includes two clamping parts arranged opposite to each other and a connecting part connected between the two clamping parts, and the two clamping parts clamp the two panels of the heat exchange plate tube so as to squeeze them toward the side baffle.

[0007] In some embodiments, the heat exchange unit also includes at least one fixing component for fixing the multiple sealing strips located on the same side of the heat exchange plate tube, the fixing component includes a main retaining member and a support connected to both ends of the main retaining member along the first direction, the support is connected to the support member, and the main retaining member limits the movement of the multiple sealing strips at least in the second direction and the third direction.

[0008] In some embodiments, the main retaining member has a plurality of first limiting holes arranged along the first direction, the two clamping parts of the sealing clip respectively pass through two adjacent first limiting holes, there is a clearance fit between the first limiting holes and the clamping parts, the connecting part is formed with an elongated hole extending along the first direction, and the fixing assembly also includes a threaded fastener for passing through or abutting the elongated hole to fix the connecting part to the main retaining member.

[0009] Advantageously, the threaded fastener is connected to the main retainer through the elongated hole of the connecting portion along the second direction.

[0010] In some embodiments, the main retaining member has a base plate and baffles connected to both sides of the base plate and arranged opposite to each other, the base plate has a plurality of first limiting holes arranged along the first direction, the connecting portion is provided with the elongated hole on at least one of the two sides along the third direction, and the threaded fastener passes through at least one of the baffles along the third direction and abuts against the elongated hole.

[0011] Advantageously, the main retaining member has a plurality of second limiting holes arranged along the first direction, and the two clamping portions of the sealing strip pass through the same or two adjacent second limiting holes. The fixing assembly also includes a pressure plate, which is arranged parallel to the main retaining member and fixed to the main retaining member and / or the support member and / or the support, and is used to limit the movement of the plurality of sealing strips in the second direction.

[0012] In some embodiments, the connecting portion of the sealing clip is provided with a lap flange extending outward in a direction perpendicular to the two clamping portions, the two clamping portions of the sealing clip pass through the same second limiting hole, and the lap flange overlaps the periphery of the second limiting hole.

[0013] Advantageously, the two clamping portions of the sealing clip pass through two adjacent second limiting holes and are connected to the main retaining member.

[0014] Advantageously, the pressing plate comprises a bottom portion pressing the connecting portion along the second direction and side portions connected to both sides of the bottom portion and arranged opposite to each other, and the two side portions restrict the sealing strip from moving in the third direction.

[0015] In some embodiments, the fixing assembly further includes a fastener, the main retaining member is formed with a strip hole extending along the first direction, and the fastener passes through the strip hole of the main retaining member along the second direction to connect to the connecting portion of the sealing strip.

[0016] In some embodiments, the main retaining member includes a main board and wing plates connected to both sides of the main board and opposite to each other to limit the movement of the sealing strip in the second direction and the third direction.

[0017] Advantageously, the thickness of a portion of the clamping portion of the sealing clip located in the first limiting hole or the second limiting hole is reduced.

[0018] In some embodiments, the heat exchange unit further includes an elastic pad, which is disposed between the clamping portion and the panel and / or between the connecting portion and the main retaining member.

[0019] As an alternative or supplement, the heat exchange unit further includes an elastic pad, which is arranged between the connecting portion and the pressing plate.

[0020] Advantageously, a sealing ring is provided at the connection between the heat exchange plate tube and the front sealing plate and / or the rear sealing plate, and the heat exchange unit also includes a plurality of pressure strips for crimping the sealing ring to the front sealing plate and / or the rear sealing plate, and the pressure strip is integral or split. When the pressure strip is split, the pressure strip includes a plurality of sub-pressure strips, and the sub-pressure strip is provided with a C-shaped opening on at least one side along the first direction, and the C-shaped openings of two adjacent sub-pressure strips surround the same heat exchange plate tube, or the plurality of sub-pressure strips are respectively provided with one or more annular openings for surrounding the same heat exchange plate tube.

[0021] According to another aspect of the utility model, an air preheater is provided, the air preheater comprising: a shell, the shell comprising a front end plate and a rear end plate arranged opposite to each other and fixing parts for fixing the front end plate and the rear end plate, the front end plate and the rear end plate are respectively provided with at least one first mounting port and a second mounting port opposite to each other; at least one heat exchange unit, the heat exchange unit is arranged between the first mounting port and the second mounting port, the front sealing plate and the rear sealing plate of the heat exchange unit are respectively connected to the front end plate and the rear end plate; wherein the heat exchange unit is the heat exchange unit described in the utility model.

[0022] In some embodiments, each of the heat exchange units is equipped with a guiding device for guiding the heat exchange unit into the shell, the guiding device includes a moving component installed on the heat exchange unit and a guide rail component installed on the shell, the guide rail component includes a guide rail support and a guide rail, the guiding direction of the guide rail is set in a direction perpendicular to the front end plate, one end of the guide rail and one end of the guide rail support are respectively fixed on both sides of the shell along the guiding direction, and the other end of the guide rail and the guide rail support are movably connected.

[0023] Advantageously, the guide rail support and the guide rail are overlapped, the guiding device further comprises a threaded fastener, and the overlapped portions of the guide rail support and the guide rail are respectively provided with connecting holes for inserting the threaded fastener, and at least one of the connecting holes on the guide rail support and the guide rail is an elongated hole extending along the guiding direction of the guide rail assembly; or, one of the guide rail support and the guide rail is a cylindrical structure axially along the third direction, and the other extends into the cylindrical structure.

[0024] Advantageously, the cross-sectional shapes of the guide rail support and the guide rail have openings in the same direction, thereby forming an overlap, and the cross-sectional shape includes any one of the following: V-shaped, C-shaped, U-shaped and trapezoidal.

[0025] In some embodiments, the support member of the air preheater includes a pillar having a U-shaped cross-sectional shape perpendicular to the third direction, and both ends of the pillar are respectively connected to the front sealing plate and the rear sealing plate, and the moving component includes a connecting shaft and a roller sleeved on the connecting shaft, and both ends of the connecting shaft are connected to the pillar along the first direction, and the roller is located in the U-shaped opening of the pillar.

[0026] Advantageously, the outer circumferential dimension of the first mounting port is larger than the outer circumferential dimension of the rear sealing plate, and the outer circumferential dimensions of the first mounting port and the second mounting port are respectively smaller than the outer circumferential dimensions of the front sealing plate and the rear sealing plate, so that after the heat exchange unit enters the shell, the front sealing plate and the rear sealing plate are respectively attached to the outer surface of the front end plate and the inner surface of the rear end plate along the entry direction, and annular sealing gaskets are respectively provided between the front sealing plate and the front end plate and between the rear sealing plate and the rear end plate.

[0027] In some embodiments, an enclosure for accommodating the heat exchange unit is formed on the inner plate surface of the rear end plate, and the annular sealing gasket is located between the rear sealing plate and the rear end plate and inside the enclosure. When the heat exchange unit is pushed along the guide direction of the guide device, the rear sealing plate enters the enclosure, and when the front sealing plate is fixed and pressed with the front end plate, the rear sealing plate and the rear end plate are pressed at the same time.

[0028] Advantageously, when the front sealing plate is fixedly pressed against the front end plate, the rear sealing plate of the heat exchange unit is only pressed and connected to the rear end plate.

[0029] Advantageously, a notch is provided on an edge of the first mounting opening of the front end plate for allowing the moving component to pass through.

[0030] According to the heat exchange unit of the embodiment of the utility model, multiple heat exchange plate tubes are integrated into one, which is convenient for installation and disassembly, and multiple sealing strips are arranged at the heat exchange plate tubes, thereby limiting the movement of the panel away from the side baffle, reducing the leakage caused by the gap between the panel and the side baffle, thereby improving the reliability of the heat exchange unit and extending its service life. According to the heat exchange unit provided by the embodiment of the utility model, the air preheater that enters and exits the shell through the guide device can realize the rapid disassembly and assembly of the heat exchange unit, and the later maintenance and repair of the equipment is extremely convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of an air preheater according to an embodiment of the utility model;

[0033] Figure 2 It is a schematic diagram of the three-dimensional structure of the heat exchange unit according to an embodiment of the utility model;

[0034] Figure 3 It is a schematic structural diagram of an example of a heat exchange plate and tube in a heat exchange unit according to an embodiment of the utility model;

[0035] Figure 4 This is a schematic diagram of the installation of a heat exchange unit according to an embodiment of the utility model;

[0036] Figure 5 for Figure 4 A partial enlarged view of the portion indicated in the dotted frame;

[0037] Figure 6 It is an enlarged schematic diagram of an example of a guide rail assembly that can be used for an air preheater according to an embodiment of the utility model;

[0038] Figure 7 For along Figure 4 The cross-sectional view obtained by cutting at the position and direction indicated by the middle section line C1-C1 shows an exemplary structure of roller installation in the air preheater according to an embodiment of the utility model;

[0039] Figure 8 A front view of a front end plate according to an embodiment of the utility model;

[0040] Fig. 9 is an exemplary front view of a sealing card strip that can be used in a heat exchange unit according to an embodiment of the utility model;

[0041] Fig.10 An exemplary installation structure of a fixing component in a heat exchange unit according to an embodiment of the utility model is shown in a partially enlarged view;

[0042] Fig.11 and Fig.12 An example 1 of a fixing assembly and a sealing strip matched therewith that can be used for a heat exchange unit according to an embodiment of the utility model is shown, wherein Fig.11 Exploded view of the parts. Fig.12 It is a partial cross-sectional view of the heat exchange unit taken perpendicularly to the third direction, schematically showing the installation and matching of the fixing assembly, the sealing strip and the heat exchange plate tube;

[0043] Fig.13 A variation of the main retainer that can be used in the fixing assembly of Example 1 is shown;

[0044] Fig.14 and Fig.15 An example 2 of a fixing assembly and a sealing strip matched therewith that can be used for a heat exchange unit according to an embodiment of the utility model is shown, wherein Fig.14 Exploded view of the parts. Fig.15 It is a partial cross-sectional view of the heat exchange unit taken perpendicularly to the third direction, schematically showing the installation and matching of the fixing assembly, the sealing strip and the heat exchange plate tube;

[0045] Fig.16 An exemplary perspective view of a sealing card strip that can be used in Example 2 is shown;

[0046] Fig.17 and Fig.18 Example 3 of a fixing assembly and a sealing strip matched therewith that can be used for a heat exchange unit according to an embodiment of the utility model is shown in an exploded view of parts;

[0047] Fig.19 and Fig. 20 An example 4 of a fixing assembly and a sealing strip matched therewith that can be used for a heat exchange unit according to an embodiment of the utility model is shown, wherein Fig.19 Exploded view of the parts. Fig. 20 It is a partial cross-sectional view of the heat exchange unit taken perpendicularly to the third direction, schematically showing the installation and matching of the fixing assembly, the sealing strip and the heat exchange plate tube;

[0048] Fig.21 and Fig. 22 An example 5 of a fixing assembly and a sealing strip matched therewith that can be used for a heat exchange unit according to an embodiment of the utility model is shown, wherein Fig.21 Exploded view of the parts. Fig. 22 It is a partial cross-sectional view of the heat exchange unit taken perpendicularly to the third direction, schematically showing the installation and matching of the fixing assembly, the sealing strip and the heat exchange plate tube;

[0049] Fig.23 It is a schematic diagram of the structure of a sealing clip strip that can be used in Example 5 of the embodiment of the utility model, and its connecting portion is provided with a lap flange;

[0050] Fig.24 A variation of the pressure plate that can be used in Examples 4 and 5 is shown, in which the pressure plate has baffles on both sides;

[0051] Fig.25 It is a partial cross-sectional view of the heat exchange unit taken perpendicularly to the third direction, schematically showing the installation and matching of the fixing assembly, the sealing strip and the heat exchange plate tube, wherein a buffer pad is provided between the pressing plate and the sealing strip;

[0052] Fig.26 An exploded view of the installation structure of a split pressure strip that can be used in a heat exchange unit according to an embodiment of the utility model;

[0053] Fig. 27 The structure of the split pressure strip in the heat exchange unit according to the embodiment of the utility model is schematically shown. DETAILED DESCRIPTION

[0054] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. For ease of description, only the parts related to the utility model are shown in the accompanying drawings. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict.

[0055] First of all, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, in the description of this application, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0056] In addition, it should be noted that in the description of the present application, terms such as "upper", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the structure must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0057] Figure 1 Schematic diagram of the three-dimensional structure of the air preheater of the utility model embodiment. Figure 1 As shown, the air preheater includes a shell 1 and one or more heat exchange units 2 arranged in the shell 1, wherein the shell 1 includes a front end plate 11 and a rear end plate 12 arranged opposite to each other and a fixing member 13 for fixing the front end plate 11 and the rear end plate 12, the front end plate 11 and the rear end plate 12 are respectively provided with a first mounting opening 11a and a second mounting opening 12a opposite to each other; at least one heat exchange unit 2 is arranged between the first mounting opening 11a and the second mounting opening 12a.

[0058] The structure, quantity and material of the fixing member 13 are not limited, such as sheet metal, rods, etc. The fixing member 13 can be connected to the front plate 11 and the rear plate 12 by welding, bolt connection, etc., and the front plate 11, the rear plate 12 and the fixing member 13 can also be designed as an integrated frame structure. The housing 1 is provided with a smoke inlet A1, a smoke outlet A2, an air inlet B1 and an air outlet B2.

[0059] Figure 2 Schematic diagram of the three-dimensional structure of the heat exchange unit 2, for easy understanding, Figure 23 shows three mutually perpendicular directions to be used in the following text: a first direction x, a second direction y and a third direction z. Figure 2 As shown, the heat exchange unit 2 includes a frame structure 21, a plurality of heat exchange plate tubes 22 arranged in the frame structure 21, and a plurality of sealing strips 23 respectively clamped on both sides of the heat exchange plate tubes 22 along the y direction. The frame structure 21 includes a front sealing plate 211 and a rear sealing plate 212 arranged opposite to each other and a support member 213 connected therebetween. The front sealing plate 211 and the rear sealing plate 212 are respectively connected to the front end plate 11 and the rear end plate 12. The front sealing plate 211 and the rear sealing plate 212 respectively have a plurality of first mounting holes 211a and a plurality of second mounting holes 212a opposite to each other.

[0060] like Figure 3 As shown, the heat exchange plate tube 22 is a flat hollow tube, which includes two panels 221 arranged opposite to each other in the x direction along its thickness direction and a side baffle 222 arranged opposite to each other in the y direction parallel to the front sealing plate 211 and located between the two panels 221. The panels 221 and the side baffles 222 enclose a heat exchange channel 22c. The heat exchange plate tube 22 has an inlet end 22a and an outlet end 22b in the z direction perpendicular to the x direction and the y direction. The inlet end 22a and the outlet end 22b are respectively installed in the first mounting hole 211a and the second mounting hole 212a, wherein at least one side baffle 222 is separate from at least one panel 221 and is sealed and connected; a plurality of sealing strips 23 are used to limit the movement of the panel 221 away from the side baffle 222.

[0061] For one side of the heat exchange plate tube 22, one or more side baffles 222 may be provided, and the side baffles 222 and the panel 221 may be sealed and combined by an adhesive. Some heat exchange plate tubes 22 are also provided with support bars 223, and the support bars 223 and the panel 221 may also be designed as one piece or as a separate piece.

[0062] The utility model integrates a plurality of heat exchange plate tubes into a heat exchange unit, which increases the convenience of installation and replacement, solves the problem of time-consuming replacement of a single heat exchange plate tube, and is not prone to secondary damage to other heat exchange plate tubes during the replacement process.

[0063] The various components of the heat exchange unit 2 are described below.

[0064] return Figure 2 The structural form of the support member 213 in the frame structure 21 is not limited, and it can be a support plate, a support column, etc. The support member 213 forms a stable frame structure with the front sealing plate 211 and the rear sealing plate 212.

[0065] Figure 4 It is a schematic diagram of the connection between a single heat exchange unit 2 and the front end plate 11 and the rear end plate 12. Figure 5 for Figure 4 Enlarged view of the middle and rear end plates 12. The outer peripheral size of the first mounting opening 11a is larger than the outer peripheral size of the rear sealing plate 212, but smaller than the outer peripheral size of the front sealing plate 211, and the outer peripheral size of the second mounting opening 12a is smaller than the outer peripheral size of the rear sealing plate 212, so that when the heat exchange unit 2 enters the shell 1, the front end plate 11 and the rear end plate 12 form blocking limits for the front sealing plate 211 and the rear sealing plate 212 respectively, and the front sealing plate 211 and the rear sealing plate 212 are respectively attached to the outer surface of the front end plate 11 and the inner surface of the rear end plate 12 along the entry direction.

[0066] like Figure 5 As shown, an enclosure 121 for accommodating the end of the heat exchange unit 2 is provided around the second installation opening 12a of the rear end plate 12, and an annular sealing gasket 14 is provided between the front sealing plate 211 and the front end plate 11 and between the rear sealing plate 212 and the rear end plate 12 (the annular sealing gasket 14 at the front end plate 11 is not shown in the figure), which can prevent smoke and wind from flowing into each other during use. When installing the heat exchange unit 2, push it in the feeding direction until the annular sealing gasket 14 on the rear end plate 12 is pressed, and then fix the front sealing plate 211 and the front end plate 11 with bolts. After the front sealing plate 211 and the front end plate 11 are fixed, the two annular sealing gaskets 14 can be further pressed to achieve a sealed connection between the heat exchange unit 2 and the shell 1.

[0067] It can be seen that the above fixing method does not require additional connection parts to be provided between the rear end plate 12 and the rear sealing plate 212 , thereby simplifying the installation and disassembly process of the heat exchange unit 2 .

[0068] In order to make it more convenient for the heat exchange unit 2 to enter or exit the housing 1, a guide device 3 is provided at each heat exchange unit 2, and the guide device 3 can guide and center the heat exchange unit 2 when entering or exiting the housing 1. Figure 4 As shown, the guiding device 3 includes a moving member 31 installed on the heat exchange unit 2 and a guide rail assembly 32 installed on the shell 1 .

[0069] In addition to guiding, the guide rail assembly 32 also supports the heat exchange unit 2. In order to prevent the heat exchange unit 2 from tilting up at the initial stage of entry, a lifting device can be provided to lift the non-entered part of the heat exchange unit 2 to prevent the tilted entered part from affecting other heat exchange units 2. The lifting device can be a pulley assembly.

[0070] For one heat exchange unit 2 , one or more groups of guide devices 3 may be installed. In this embodiment, two groups of guide devices 3 are installed at the lower part of each heat exchange unit 2 .

[0071] The cooperation between the moving part 31 and the guide rail assembly 32 can be in various forms, such as the cooperation between the roller and the guide rail, the cooperation between the drum and the groove, the cooperation between the roller and the groove, etc. The friction coefficient of the rolling friction is small, and at the same time, it can constrain the movement trajectory of the heat exchange plate tube 22, making it more convenient for the heat exchange unit 2 to enter and exit the shell 1. The roller can be in an inverted V shape, an inverted trapezoidal shape, etc. The bottom of the groove can be set as a plane, and corresponding ridges or grooves can also be designed to match the shape of the moving part 31. For a set of guiding devices 3, the number of moving parts 31 can be multiple, and at least two are recommended to further reduce the resistance during the installation of the heat exchange unit 2. When there are multiple moving parts 31, they can be installed on the support member 213 of the heat exchange unit 2 at intervals along the guiding direction.

[0072] like Figure 6 The figure shows a partial enlarged view of the guide rail assembly 32. Figure 6 As shown, the guide rail assembly 32 includes a guide rail support 321 and a guide rail 322. One end of the guide rail support 321 is fixed to the rear end plate 12, and one end of the guide rail 322 is fixed to the front end plate 11 (see Figure 4 ), the other end of the guide rail support 321 is connected to the other end of the guide rail 322, and the connection method can be a fixed connection or a movable connection. Considering that the use environment of the guide rail assembly 32 has high and low temperature changes, it is recommended that the guide rail support 321 and the guide rail 322 can be telescopically connected, so that the guide rail 322 can have a certain displacement along the guiding direction when it expands due to heat.

[0073] It is understandable that the installation positions of the guide rail support 321 and the guide rail 322 can be interchanged, that is, the guide rail support 321 is fixed to the front end plate 11, and the guide rail 322 is fixed to the rear end plate 12. The two can also be fixed to any other position of the housing 1, such as the fixing member 13. The connection structure between the guide rail support 321 and the guide rail 322 and the housing 1 is not limited, such as welding, threaded connection, and crimping.

[0074] The guide rail support 321 and the guide rail 322 may be overlapped, and the cross-sections of the two may be designed to be the same shape, such as V-shaped, U-shaped, trapezoidal, etc., and the openings of the two may be oriented in the same direction to form an overlap. Figure 6 and Figure 7 As shown, both can be in an inverted V shape to achieve a better centering effect, and the moving member 31 is a V-shaped roller. Figure 6As shown, the overlapping part of the guide rail support 321 and the guide rail 322 is fixed by a fastener 323, and the fastener 323 can be a bolt, nut, screw, stud, pin, etc., and a connection hole for the fastener to penetrate is respectively provided at the overlapping part of the guide rail support 321 and the guide rail 322, and the connection hole on at least one of the guide rail support 321 and the guide rail 322 is set as a strip hole extending along the guiding direction, so that when the guide rail 322 is heated and expanded, it can be freely extended to avoid damage to the front end plate 11 or the rear end plate 12 during the expansion process of the guide rail 322. The guide rail support 321 and the guide rail 322 can also be designed to have different cross-sectional shapes, such as the guide rail support 321 is V / U-shaped and the guide rail 322 is cylindrical; or the guide rail support 321 is cylindrical and the guide rail 322 is inverted V / U-shaped.

[0075] In addition, the guide rail support 321 and the guide rail 322 can also be connected by relative sliding, such as a sleeve connection, where one of the two is designed as a cylindrical structure axially along the guiding direction, and the other is inserted into the cylindrical structure, which can also achieve free expansion and contraction of the guide rail 322.

[0076] The moving member 31 can be installed by using a special fixing device or by using a fixing device such as Figure 7 In the manner shown, the support member 213 of the heat exchange unit 2 is designed as a pillar with a U-shaped cross section, such as a pillar made of channel steel, and the moving member 31 is installed in the U-shaped groove of the pillar, such as a roller sleeved on the connecting shaft, and the two ends of the connecting shaft are respectively connected to the two side walls of the pillar, such as Figure 7 This can avoid the need to provide a separate fixing device for the moving part 31, making the structure of the entire heat exchange unit 2 more compact.

[0077] It should be understood that the support member 213 located on the upper side of the heat exchange unit 2 without fixing the moving member 31 may also be in other forms as long as it can play the role of connecting the front sealing plate 211 and the rear sealing plate 212 .

[0078] like Figure 8 As shown, in order to allow the rollers to smoothly enter and exit the front end plate 11, a groove 11b for allowing the moving part 31 to pass can be set at the edge of the first installation port 11a of the front end plate 11. In this way, when installing the heat exchange unit 2, the two rollers can be first inserted into the groove 11b located on the front end plate 11, and then pushed forward along the guide direction of the guide rail assembly 32 until the annular sealing gasket 14 located on the rear end plate 12 is compressed, and finally the front sealing plate 211 is fixed to the front end plate 11 to further compress the two annular sealing gaskets 14.

[0079] Fig. 9 The structure of the sealing card strip 23 is shown. Fig. 9As shown, the sealing clip 23 includes two clamping parts 231 arranged opposite to each other and a connecting part 232 connecting the two clamping parts 231. The two clamping parts 231 clamp the two panels 221 of the heat exchange plate tube 22 to squeeze them toward the side baffle 222. The sealing clip 23 can be made of metal or non-metal material.

[0080] In this embodiment, sealing strips 23 are provided at each heat exchange plate tube 22. When a gap appears in the adhesive between the panel 221 and the side baffle 222 due to aging, the clamping effect of the sealing strips 23 can keep the relative position between the two side panels 221 and the side baffle 222 fixed, and the gap will not become larger, thereby reducing the leakage.

[0081] In addition, an elastic pad 24 may be provided between the clamping portion 231 of the sealing clip 23 and the heat exchange plate tube 22 (see Fig.12 ), the elastic pad 24 can buffer the force on the panel 221, preventing the sealing strip 23 from directly contacting the panel 221 and damaging it. The material of the elastic pad 24 can be selected from corrosion-resistant rubber materials such as soft polytetrafluoroethylene, fluororubber, silicone rubber, polyurethane rubber, etc. It is easy to understand that the elastic pad 24 can be independent or combined with the inner surface of the sealing strip 23, and the combination method includes bonding, riveting, etc.

[0082] During the use or transportation of the air preheater, the inventors found that the sealing strip 23 may be displaced or fall off due to vibration, thereby losing its clamping effect on the heat exchange plate tube 22. Based on this problem, the following solution is proposed.

[0083] like Fig.10 Shown Figure 2 The enlarged view of the sealing strip 23 in the middle. Fig.10 As shown, the heat exchange unit 2 further includes at least one fixing assembly 25 for fixing a plurality of sealing strips 23 located on the same side of the heat exchange plate tube 22 .

[0084] According to the embodiment of the present utility model, as will be referred to below Figures 11 to 25 As described in detail, the fixing assembly 25 includes a main retaining member, which limits the movement of the plurality of sealing clips 23 at least in the y-direction and the z-direction.

[0085] At least one set of fixing components 25 is provided according to the number and position of the sealing strips 23. It is recommended to respectively provide the sealing strips 23 and the fixing components 25 on both sides of the heat exchange plate tube 22 along the y direction, and the fixing components 25 can be symmetrically provided (symmetry can refer to Figure 7), the sealing strips 23 and the fixing components 25 can also be arranged in multiple groups at intervals along the z direction. In this way, when the adhesive between the panel 221 of the heat exchange plate tube 22 and the side baffle 222 has a gap due to aging, the clamping effect of the sealing strips 23 and the fixing of the sealing strips 23 by the fixing components 25 will prevent the gap from becoming larger and larger, thereby avoiding a sharp increase in leakage.

[0086] In this embodiment, a plurality of heat exchange plate tubes 22 are integrated into a heat exchange unit 2. The integrated structure facilitates the installation of fixing components 25 at a plurality of sealing clips 23. Due to the holding effect of the fixing components 25 on the plurality of sealing clips 23, the sealing clips 23 are not easy to fall off during the transportation and use of the heat exchange plate tubes 22, thereby reducing the breakage rate of the heat exchange plate tubes.

[0087] The following reference Figures 11 to 25 Different examples of fixing components and sealing strips that can be used for the heat exchange unit according to the embodiment of the utility model are introduced in detail.

[0088] Example 1:

[0089] Fig.11 and Fig.12 An example 1 of a fixing assembly and a sealing strip matched therewith that can be used for a heat exchange unit according to an embodiment of the utility model is shown, wherein Fig.11 Exploded view of the parts. Fig.12 It is a partial cross-sectional view of the heat exchange unit taken perpendicularly to the third direction, schematically showing the installation and coordination of the fixing assembly, the sealing strip and the heat exchange plate tubes.

[0090] like Fig.11 As shown, the fixing assembly 25 includes a main retaining member 251 and a support 252 connected to both ends of the main retaining member 251 along the x direction. The support 252 is connected to the support member 213 of the frame structure 21 of the heat exchange unit 2. The support 252 and the support member 213 can be welded, bolted, etc. It should be understood that the fixing assembly 25 can also be provided with no support 252, and the two ends of the main retaining member 251 are directly fixed to the support member 213.

[0091] like Fig.11 As shown, the main retaining member 251 is a flat member, which is formed with through holes 251a arranged along the x direction; the fixing component 25 also includes a fastener 253, which passes through the through holes 251a of the main retaining member 251 along the y direction and is connected to the connecting portion 232 of the sealing strip 23 to fix the sealing strip 23.

[0092] The connection between the fastener 253 and the connection portion 232 may be a threaded connection, a crimping connection, etc. In this embodiment, the connection portion 232 is provided with a threaded hole 232 a , and the fastener 253 is threadedly connected to the connection portion 232 .

[0093] A gasket (not shown in the figure) may be provided between the main retaining member 251 and the sealing clip 23 to allow the two to fit and press better. The gasket may be a non-metallic gasket such as a rubber gasket.

[0094] Due to errors in manufacturing, installation, etc., it is difficult to ensure that the first mounting hole 211a on the front sealing plate 211, the second mounting hole 212a on the rear sealing plate 212, and the clamped sealing clip 23 corresponding to the same heat exchange plate tube 22 are located in a straight line, which may cause the middle part of the heat exchange plate tube 22 to deform and shift during the process of tightening the fastener 253 after installing the sealing clip 23 (different from the position when only the front sealing plate 211 and the rear sealing plate 212 are fixed). In this case, the heat exchange plate tube 22 may be in a stress tension state, which may cause it to be easily damaged during transportation, installation, use, maintenance, etc.

[0095] In order to solve this problem, the through hole 251a can be set as a strip hole extending along the x direction, such as Fig.11 In this way, the sealing strip 23 is allowed to have a certain adjustment displacement along the cross-sectional thickness direction (i.e., x direction) of the heat exchange plate tube 22 according to the actual state of the heat exchange plate tube 22, while limiting the movement of the sealing strip 23 along the y direction and the z direction.

[0096] The connection method of Example 1 defines the relative position relationship between the sealing strip 23 and the main retaining member 251, which can avoid the problem of displacement or falling off of the sealing strip 23 during installation, transportation, use or maintenance.

[0097] Fig.13 A variation of the main retainer that can be used for the fixing assembly of Example 1 is shown, wherein Figure (a) and Figure (b) respectively show the main retainers 251A and 251B. The main retainers 251A and 251B each include a main board 2511 and wing plates 2512 connected to both sides of the main board 2511 and opposite to each other, thereby forming a U-shaped cross section, and when installed, the opening of the U-shaped faces the sealing clip 23. The main retainers 251A and 251B constructed in this way can limit the movement of the sealing clip 23 in the y direction and the z direction, allowing the sealing clip 23 to move within a certain range in the x direction (i.e., the thickness direction of the heat exchange plate tube 22), which can prevent the heat exchange plate tube 22 from being in a stress tension state due to the clamping effect of the sealing clip 23.

[0098] The difference between the main retaining member 251B and 251A is that 251B is provided with an observation groove 251B-1 on the wing plate 2512 on one side or both sides, so that the movement of the sealing strip 23 along the z direction can be partially restricted by the wing plate 2512 between the observation grooves 251B-1, and the installation status of the sealing strip 23 can be observed through the observation grooves 251B-1.

[0099] In the main retaining members 251A and 251B, due to the presence of the wing plates 2512, the requirement that the multiple sealing strips 23 are in the same straight line along the x direction is reduced, as long as the wing plates on both sides can include all the sealing strips 23. Since both ends of the main retaining member 251 have been fixed on the support member 213, their relative positions have been fixed, so fasteners are not required, allowing the heat exchange plate tube 22 to have a certain amount of movement in the x direction. At this time, the support member 213 can provide the heat exchange plate tube 22 with a limit in the x direction.

[0100] The fixing assembly 25 in Example 1 uses a relatively simple structure to achieve fixed support and compression of multiple sealing strips 23.

[0101] In the examples 2-5 described below, the main retainer is provided with a limiting hole, and the clamping portion of the sealing clip passes through the limiting hole and is connected to the heat exchange plate tube. In this way, the position of the sealing clip is initially limited by the limiting hole on the main retainer, and then the sealing clip is connected to the heat exchange plate tube, which is conducive to completing the assembly of the heat exchange unit more conveniently and quickly.

[0102] Let's first look at Example 2 and Example 3. In these two examples, the main retaining member 251 has a plurality of first limiting holes arranged along the x-direction, and the two clamping portions 231 of the sealing clip 23 respectively pass through two adjacent first limiting holes, and there is a clearance fit between the first limiting holes and the clamping portions 231. The connecting portion 232 is formed with a through hole extending along the x-direction, and the fastener 253 passes through or abuts the through hole to fix the connecting portion 232 to the main retaining member 251.

[0103] The clearance between the first limiting hole and the clamping portion 231 enables the sealing strip 23 to obtain a certain displacement in the x direction relative to the first limiting hole, thereby avoiding excessive local force due to the sealing strip 23 being unable to move in the x direction.

[0104] Example 2:

[0105] Fig.14 and Fig.15 An example 2 of a fixing assembly and a sealing strip matched therewith that can be used for a heat exchange unit according to an embodiment of the utility model is shown, wherein Fig.14 Exploded view of the parts. Fig.15 It is a partial cross-sectional view of the heat exchange unit taken perpendicularly to the third direction, schematically showing the installation and coordination of the fixing assembly, the sealing strip and the heat exchange plate tubes.

[0106] like Fig.14 and Fig.15As shown, the main retaining member 251 is a flat member, on which first limiting holes 251b arranged along the x direction are provided, and the first limiting holes 251b cooperate with the clamping parts 231 of the sealing clip 23; a fixing hole 251c is provided between two adjacent first limiting holes 251b, and the two clamping parts 231 of the sealing clip 23 pass through the two adjacent first limiting holes 251b along the y direction to clamp each heat exchange plate tube 22. Fig.14 and Fig.15 As shown, the connection portion 232 of the sealing card strip 23 is provided with a through hole 232b, and the fastener 253 passes through the through hole 232b and is connected to the fixing hole 251c, thereby realizing the fixed connection between the main retaining member 251 and the sealing card strip 23. The fastener 253 applies a pre-tightening force along the y direction, the connection is firm and stable, and the movement of the sealing card strip 23 along the y direction and the z direction is limited.

[0107] Fig.16 FIG. 2 shows an exemplary stereogram of a sealing card strip 23 that can be used in Example 2. The through hole 232b on the sealing card strip 23 can be a straight hole or a through hole such as Fig.16 Preferably, as shown in the step hole Fig.16 As shown, the through hole 232b may be an elongated hole extending in the x direction, so as to facilitate the automatic position adjustment of the sealing strip 23 in the x direction, avoid the heat exchange plate tube 22 being in a stress tension state, and improve its service life.

[0108] Example 3:

[0109] Fig.17 and Fig.18 The exploded view of the parts shows an example 3 of a fixing assembly and a sealing strip that can be used for a heat exchange unit according to an embodiment of the utility model. Fig.17 and Fig.18 As shown, in Example 3, the fixing assembly includes a main retaining member 251, a support 252 arranged at both ends of the main retaining member 251, and a fastener 253. The main retaining member 251 is a member with a U-shaped cross-section, which has a bottom plate 2511' and baffles 2512' connected to both sides of the bottom plate 2511' and arranged opposite to each other. The bottom plate 2511' has a plurality of first limiting holes 251b arranged along the x direction, and the two clamping portions 231 of the sealing clip 23 pass through two adjacent first limiting holes 251b along the y direction to clamp each heat exchange plate tube 22; the connecting portion 232 of the sealing clip 23 is provided with an abutment hole 232c on at least one of the two sides along the z direction, and the fastener 253 passes through at least one baffle 2512' along the z direction and abuts against the abutment hole 232c.

[0110] For a sealing clip 23, one fastener 253 may be used to connect with two baffles 2512' at the same time, or two fasteners 253 may be used to connect with the two baffles 2512' respectively.

[0111] like Fig.17 The figure shows a situation where a fastener 253 is connected to both side baffles 2512' of the main retaining member 251 at the same time. The abutment hole 232c is a through light hole. One side baffle 2512' of the main retaining member 251 is provided with a plurality of light holes 2512a along the x direction, and the other side baffle 2512' is provided with a plurality of threaded holes 2512b. The fastener 253 sequentially passes through the light holes 2512a on one side baffle 2512' and the abutment hole 232c on the sealing clip 23 and is connected to the threaded hole 2512b on the other side baffle 2512'. It is also possible to provide a threaded hole in the connection portion 232 of the sealing clip 23, and provide a light hole on one or both side baffles 2512'.

[0112] Advantageously, the shape of the light hole on the abutment hole 232c or the baffle 2512' is preferably designed to be an elongated hole extending along the x-direction. Compared with a circular hole, the design of the elongated hole can reduce the difficulty of processing, manufacturing and installation, making it easier to achieve centering of multiple holes.

[0113] like Fig.18 The figure shows the situation where two fasteners 253 are used to connect with the baffles 2512' on both sides. In this case, the abutment holes 232c are a pair of blind holes (bright holes) symmetrically arranged on both sides of the connection part 232, and the baffles 2512' on both sides of the main retainer 251 are respectively provided with threaded holes 2512b, and the ends of the two fasteners 253 are respectively pressed against the blind holes on both sides of the connection part 232, playing the role of top screws, and relying on the friction and obstruction of the blind holes on the fasteners 253, the sealing card strip 23 is limited in the y direction. It is also possible to set threaded holes in the connection part 232 of the sealing card strip 23, and set bright holes on the baffles 2512' on both sides. Similarly, the shape of the bright hole on the connection part 232 or the bright hole on the baffle 2512' is preferably designed to be an elongated hole extending in the x direction.

[0114] In Examples 2 and 3, the main retaining member 251 is disposed close to the heat exchange plate tube 22, and serves to position the sealing clip 23 for installation. This structure limits the movement of the sealing clip 23 along the y and z directions, while allowing it to automatically adjust its position along the x direction, thereby avoiding excessive force on the heat exchange plate tube and placing it in a stress-tensioned state.

[0115] In Examples 4 and 5, a plurality of second limiting holes arranged along the x-direction are opened on the main retaining member 251 and matched with a pressure plate. The two clamping portions 231 of the sealing strip 23 pass through the same or two adjacent second limiting holes. The pressure plate is arranged parallel to the main retaining member 251 and fixed to the main retaining member 251 and / or the support member 213 and / or the support 252, so as to limit the movement of the plurality of sealing strips 23 in the y-direction.

[0116] Example 4:

[0117] Fig.19 and Fig. 20 An example 4 of a fixing assembly and a sealing strip matched therewith that can be used for a heat exchange unit according to an embodiment of the utility model is shown, wherein Fig.19 Exploded view of the parts. Fig. 20 It is a partial cross-sectional view of the heat exchange unit taken perpendicularly to the third direction, schematically showing the installation and coordination of the fixing assembly, the sealing strip and the heat exchange plate tubes.

[0118] like Fig.19 As shown, in Example 4, the main retaining member 251 is a flat plate, and a plurality of second limiting holes 251d are arranged on the flat plate along the x direction, and the two clamping portions 231 of the sealing clip 23 pass through two adjacent second limiting holes 251d and are connected to the main retaining member 251. The pressing plate 254 is arranged parallel to the main retaining member 251, and the pressing plate 254 is fixed to the main retaining member 251 by a fastener 253, so as to limit the movement of the plurality of sealing clips 23 in the y direction.

[0119] like Fig.19 As shown, the fixing assembly 25 includes at least two fasteners 253 for fixing the pressure plate 254; a connecting portion through hole 232d is set at least in the connecting portion 232 of the two sealing strips 23, a pressure plate through hole 254a is set at the corresponding position on the pressure plate 254, and a positioning hole 251e is set at the corresponding position of the main retaining member 251; the bolt 253 passes through the pressure plate through hole 254a on the pressure plate 254 and the connecting portion through hole 232d on the connecting portion 232 in sequence and is connected to the positioning hole 251e on the main retaining member 251, thereby limiting the relative position relationship of the pressure plate 254, the main retaining member 251 and the sealing strip 23 in the y direction.

[0120] Preferably, the two sealing strips 23 at both ends of the main retainer 251 along the x direction are provided with connecting portion through holes 232d. Of course, the number of sealing strips 23 provided with connecting portion through holes 232d may be more than two, and a corresponding number of fasteners 253 may be used for fixing. Fig.19 As shown, fasteners 253 may be arranged at intervals along the x direction for fixing to ensure that the pressure plate 254 is subjected to balanced force and that it is evenly fitted with the plurality of sealing strips 23 .

[0121] The connecting portion through hole 232d and the pressing plate through hole 254a are preferably strip-shaped holes. This can improve the processing manufacturability and reduce the difficulty of centering the holes (connecting portion through hole 232d, pressing plate through hole 254a and positioning hole 251e), and on the other hand, it can provide a certain adjustment margin for the connection between the pressing plate 254, the sealing card strip 23 and the main retaining member 251 to avoid excessive local force.

[0122] Example 5:

[0123] Fig.21 and Fig. 22 An example 5 of a fixing assembly and a sealing strip matched therewith that can be used for a heat exchange unit according to an embodiment of the utility model is shown, wherein Fig.21 Exploded view of the parts. Fig. 22 It is a partial cross-sectional view of the heat exchange unit taken perpendicularly to the third direction, schematically showing the installation and coordination of the fixing assembly, the sealing strip and the heat exchange plate tubes.

[0124] like Fig.21 and Fig. 22 As shown, in Example 5, the main retaining member 251 adopts a flat plate, and a plurality of second limiting holes 251d' are arranged on the flat plate along the x direction; the connecting portion 232 of the sealing clip 23 is provided with a lap flange 232e extending outwardly in a direction perpendicular to the clamping portion 231 relative to the two clamping portions 231, and the two clamping portions 231 of the sealing clip 23 pass through the same second limiting hole 251d', and the lap flange 232e overlaps the periphery of the second limiting hole 251d'; the pressure plate 254 is pressed against the top of the plurality of sealing clips 23 by the fastener 253, so as to limit the movement of the plurality of sealing clips 23 in the y direction.

[0125] Fig.23 Schematic diagram of the structure of the sealing clip strip according to Example 5 of the embodiment of the utility model, wherein the connecting portion thereof is provided with a lap flange. Fig.23 As shown, the overlapping flange 232e can be arranged on both sides of the connecting portion 232 of the sealing card strip 23 along the x direction (see Fig.23 Figure (a)), it can also be arranged on both sides of the connecting portion 232 along the z direction (see Fig.23 Figure (b) in the figure) can also be arranged along the above two directions at the same time. Here, it is preferably arranged along the z direction, so that the heat exchange plate tubes 22 in the heat exchange unit 2 are arranged more compactly, thereby improving the heat exchange efficiency. Fig.23 As shown, the displacement of the sealing strip 23 along the y direction is limited by the mutual overlap between the overlap flange 232e and the main retaining member 251 and the pressing effect of the pressure plate 254.

[0126] Fig.24 A variation of the pressure plate that can be used in Examples 4 and 5 is shown, in which the pressure plate has baffles on both sides. Specifically, Fig.24 Figures (a) and (b) in the figure show the pressing plates 254A and 254B. The pressing plates 254A and 254B each include a bottom 2541 for pressing the connecting portion 232 of the sealing card strip 23 along the y direction and side portions 2542 connected to both sides of the bottom 2541 and arranged opposite to each other, thereby forming a U-shaped cross section, and the two side portions 2542 limit the movement of the sealing card strip 23 in the z direction.

[0127] The difference between the pressing plate 254B and 254A is that a notch 2542a for observing the installation status of the sealing strip 23 is further provided on the side portion 2542 on one or both sides of the pressing plate 254B, and the number of the notch 2542a can be one or more.

[0128] like Fig.21 As shown, in Example 5, the pressing plate 254 is only fixedly connected to the main retaining member 251 (in this case, the sealing card strip 23 has no holes). Fig. 22 and 26 As shown, at least two threaded holes are provided on the main retaining member 251 , and through holes are provided at corresponding positions on the pressing plate 254 . The pressing plate 254 is fixed to the main retaining member 251 by fasteners 253 , and the sealing strip 23 is compressed at the same time.

[0129] Threaded holes can be provided on both sides of the main retainer 251 along the width direction, and the threaded holes on the same side can be arranged at intervals along the length direction of the main retainer 251 to make the pressure plate 254 evenly stressed. It is recommended to provide at least one group of threaded holes diagonally on the main retainer 251, which can reduce the number of fasteners 253 used and make the pressure plate 254 stressed evenly, so that the fit between the pressure plate 254 and each sealing strip 23 is consistent.

[0130] In addition, the pressing plate 254 can be directly fixedly connected to the supporting member 213 of the heat exchange unit 2, so that the design width of the main retaining member 251 can be reduced, making the flow of the shell-side medium smoother.

[0131] In the method of fixing the pressure plate 254 only to the main retaining member 251 or the supporting member 213, the two holes are aligned or connected during installation, the processing accuracy is easier to ensure, the installation is more convenient, and no holes are required to be opened on the sealing strip 23, which greatly reduces the processing workload.

[0132] Compared with Examples 1, 2 and 3, Examples 4 and 5 greatly reduce the number of fasteners installed, and the connection portion 232 of the sealing clip 23 may not be provided with holes in whole or in part, thereby reducing the workload during the processing, installation or disassembly of the heat exchange unit 2. The sealing clip 23 without holes can move freely within a certain range along the x direction, reducing the stress on the heat exchange plate tube 22 to a certain extent.

[0133] Due to the setting of the pressure plate 254 and the existence of processing, manufacturing and installation errors, the contact surfaces of multiple sealing strips 23 and the pressure plate 254 are not necessarily on the same horizontal plane, which may cause some sealing strips 23 to still move along the z direction even if the fastening bolts have been tightened.

[0134] In order to solve this problem, a buffer pad may be provided between the pressure plate 254 and the sealing clip 23 in Examples 4 and 5. Fig.252 is a partial cross-sectional view of the heat exchange unit taken perpendicular to the third direction, schematically showing a variation in which a buffer pad 26 is provided between the pressure plate 254 and the sealing strip 23. The buffer pad 26 has a certain elasticity, which can ensure that the pressure plate 254 and each sealing strip 23 are in a compressed state. The buffer pad 26 can be a soft pad made of elastic material, such as a foam pad, a rubber pad, etc., or a soft spring.

[0135] For the fixing assembly 25 provided with the first limiting hole 251b (Examples 2 and 3) and the second limiting hole 251d (Examples 4 and 5), in order to increase the elastic deformation of the two clamping parts 231 of the sealing clip 23 when clamping the heat exchange plate tube 22 and facilitate clamping, the thickness of the matching part 231a of the clamping part 231 that does not have a clamping effect and is close to the connecting part 232 can be thinned, such as Fig. 9 and Fig.16 As shown. This can increase the elastic effect of the sealing clip 23 when clamping, so that the heat exchange plate tube 22 has a certain amount of movement space, and avoid excessive force caused by processing and installation errors. Of course, the thickness of the matching part 231a on one side can be thinned, and the thickness of the matching parts 231a on both sides can be thinned at the same time, and different thickness thinning amounts can be designed for the matching parts 231a on both sides. It is recommended to symmetrically thin the matching parts 231a on both sides to the same thickness so that the sealing clip 23 has symmetrical movement along the y direction.

[0136] The inventors also noticed that in order to prevent the heat exchange medium from leaking from the gap between the heat exchange plate tube 22 and the front sealing plate 211 or the rear sealing plate 212, it is usually necessary to set a seal between the heat exchange plate tube 22 and the front sealing plate 211 or the rear sealing plate 212. The seal is pressed between the front sealing plate 211 or the rear sealing plate 212 and the heat exchange plate tube 22 through an integrated pressure strip. However, the integrated pressure strip has the problem of inconvenient operation in actual use. When some seals are damaged and need to be replaced, it is necessary to remove all the multiple fasteners fixing the integrated pressure strip, which is a lot of work.

[0137] For this purpose, the heat exchange unit 2 of the present invention uses a split pressure strip. Fig.26 As shown, a sealing ring 4 is provided at the connection between the heat exchange plate tube 22 and the front sealing plate 211 and the rear sealing plate 212 (not shown in the figure), and the heat exchange unit 2 also includes a plurality of pressure strips 5 for crimping the sealing ring 4 to the front sealing plate 211 or the rear sealing plate 212.

[0138] like Fig. 27As shown in Figures (a) and (b), the bead 5 includes a side bead 51 and a middle bead 52. A C-shaped opening 5a is provided on one side of the side bead 51, and a C-shaped opening 5a is provided on both sides of the middle bead 52. In this way, the C-shaped openings 5a of two adjacent beadings 5 ​​facing each other surround the same heat exchange plate tube 22. A step hole is provided at the connection between the front sealing plate 211 or the rear sealing plate 212 and the sealing ring 4, respectively. The step hole forms a accommodating space for the sealing ring 4, and a bead fixing hole 211b is provided on the front sealing plate 211 and the rear sealing plate 212. The bead fixing hole 211b can be a threaded hole. The side bead 51 and the middle bead 52 are respectively fixed on the front sealing plate 211 or the rear sealing plate 212 by connecting the clamping bolts with the bead fixing hole 211b, thereby pressing the sealing ring 4 to prevent the heat exchange medium from overflowing from the gap between the step hole and the heat exchange plate tube 22, thereby playing a sealing role.

[0139] On the one hand, the sealing structure allows the heat exchange plate tube 22 to expand and contract freely when thermal expansion and contraction occur under actual heat exchange conditions. On the other hand, when a heat exchange plate tube 22 needs to be replaced, the corresponding pressure strip 5 can be removed and the corresponding heat exchange plate tube 22 can be pulled out and replaced, which greatly reduces the workload of disassembly and reinstallation.

[0140] It is understandable that multiple intermediate strips 52 can also be designed as one piece (in this case, the two C-shaped openings 5a can be processed into a complete annular opening), or one or more intermediate strips 52 can be designed as one piece with the side strips 51. This can not only achieve the purpose of convenient replacement, but also reduce the number of strips 5 used to a certain extent.

[0141] The installation order of the heat exchange unit 2 in this embodiment is:

[0142] S1: Each heat exchange plate tube 22 passes through the front sealing plate 211 and the rear sealing plate 212 in sequence; use the sealing ring 4 to fill the accommodating space formed by the outer periphery of the heat exchange plate tube 22 and the step hole on the front sealing plate 211 or the rear sealing plate 212;

[0143] S2: Install the side pressure strips 51 and the middle pressure strips 52, and tighten the clamping bolts;

[0144] S3: Install the sealing strip 23 and the fixing assembly 25 on both sides along the y direction.

[0145] The technical advantages of the heat exchange unit of the utility model embodiment include but are not limited to:

[0146] 1) Integrating multiple separate heat exchanger plates and tubes into a heat exchange unit increases the convenience of installation and replacement, solves the problem of time-consuming replacement of a single heat exchanger plate and tube, and is not likely to cause secondary damage to other heat exchanger plates and tubes during the replacement process;

[0147] 2) The heat exchanger plate tubes are clamped by sealing strips to keep the relative positions between the two side panels and the side baffles fixed, reducing the possibility of leakage and greatly improving the reliability of the heat exchanger plate tubes;

[0148] 3) The use of fixing components to fix multiple sealing strips can avoid the problem of sealing strips falling off during transportation, installation, use and later maintenance, and can alleviate the tensioning effect of the sealing strips on the heat exchange plate tubes to a certain extent, so that the heat exchange plate tubes are in a relatively free state, thereby extending the service life of the heat exchange plate tubes;

[0149] 4) The heat exchange unit is equipped with a guide device to make the heat exchange unit enter or exit the shell more smoothly, and installation and disassembly are more convenient and quick;

[0150] 5) The sealing ring is compressed by using split pressure strips at the front sealing plate and the rear sealing, which solves the problem of rapid replacement of the sealing ring of a single heat exchange plate tube when it is damaged.

[0151] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A heat exchange unit, characterized in that: The heat exchange unit comprises: A frame structure, the frame structure comprising a front sealing plate and a rear sealing plate arranged opposite to each other and a support member connected therebetween, the front sealing plate and the rear sealing plate respectively having a plurality of first mounting holes and a plurality of second mounting holes opposite to each other; A plurality of heat exchange plate tubes, wherein the heat exchange plate tubes are flat hollow tubes, and the flat hollow tubes include two panels arranged opposite to each other in a first direction along the thickness direction thereof and side baffles arranged opposite to each other in a second direction parallel to the front sealing plate and located between the two panels, wherein the panels and the side baffles enclose a heat exchange channel, and the heat exchange plate tubes have an inlet end and an outlet end in a third direction perpendicular to the first direction and the second direction, wherein the inlet end and the outlet end are respectively installed in the first mounting hole and the second mounting hole, wherein at least one side baffle is separate from at least one panel and is sealedly connected; A plurality of sealing clips are respectively clamped on both sides of the heat exchange plate tube along the second direction to limit the movement of the panel away from the side baffle.

2. The heat exchange unit according to claim 1, characterized in that: The sealing clip includes two clamping parts arranged opposite to each other and a connecting part connected between the two clamping parts. The two clamping parts clamp the two panels of the heat exchange plate tube so as to squeeze them toward the side baffle.

3. The heat exchange unit according to claim 2, characterized in that: The heat exchange unit also includes at least one fixing assembly for fixing the multiple sealing strips located on the same side of the heat exchange plate tube, the fixing assembly includes a main retaining member and a support connected to both ends of the main retaining member along the first direction, the support is connected to the support member, and the main retaining member limits the movement of the multiple sealing strips at least in the second direction and the third direction.

4. The heat exchange unit according to claim 3, characterized in that: The main retaining member has a plurality of first limiting holes arranged along the first direction, and the two clamping parts of the sealing clip respectively pass through two adjacent first limiting holes, and there is a clearance fit between the first limiting holes and the clamping parts. The fixing assembly also includes a threaded fastener for fixing the connecting part to the main retaining member.

5. The heat exchange unit according to claim 4, characterized in that: The connection portion is formed with an elongated hole elongated in the first direction, and the threaded fastener is connected to the main retainer through the elongated hole of the connection portion in the second direction.

6. The heat exchange unit according to claim 4, characterized in that: The main retaining member comprises a base plate and baffles connected to both sides of the base plate and arranged opposite to each other, the base plate comprises a plurality of first limiting holes arranged along the first direction, at least one of the baffles is provided with a threaded hole or an elongated hole extending along the first direction, at least one of the two sides of the connecting portion along the third direction is provided with an elongated hole or a threaded hole extending along the first direction, and the threaded fastener passes through at least one of the baffles along the third direction and is connected to the connecting portion.

7. The heat exchange unit according to claim 3, characterized in that: The main retaining member has a plurality of second limiting holes arranged along the first direction, and the two clamping parts of the sealing strip pass through the same or two adjacent second limiting holes. The fixing assembly also includes a pressure plate, which is arranged parallel to the main retaining member and fixed to the main retaining member and / or the support member and / or the support, and is used to limit the movement of the plurality of sealing strips in the second direction.

8. The heat exchange unit according to claim 7, characterized in that: The connecting portion of the sealing clip is provided with a lap flange extending outwardly in a direction perpendicular to the two clamping portions relative to the two clamping portions, the two clamping portions of the sealing clip pass through the same second limiting hole, and the lap flange overlaps the periphery of the second limiting hole.

9. The heat exchange unit according to claim 7, characterized in that: The two clamping portions of the sealing clip pass through two adjacent second limiting holes and are connected to the main retaining member.

10. The heat exchange unit according to any one of claims 7 to 9, characterized in that: The pressing plate includes a bottom portion pressing the connecting portion along the second direction and side portions connected to both sides of the bottom portion and arranged opposite to each other, and the two side portions restrict the sealing strip from moving in the third direction.

11. The heat exchange unit according to claim 3, characterized in that: The fixing assembly further includes a fastener, the main retaining member is formed with a strip-shaped hole extending along the first direction, and the fastener passes through the strip-shaped hole of the main retaining member along the second direction to be connected to the connecting portion of the sealing clip strip.

12. The heat exchange unit according to claim 3, characterized in that: The main retaining member includes a main board and wing plates connected to both sides of the main board and opposite to each other, so as to limit the movement of the sealing card strip in the second direction and the third direction.

13. The heat exchange unit according to any one of claims 4 to 6, characterized in that: The thickness of a portion of the clamping portion of the sealing clip located in the first limiting hole is reduced.

14. The heat exchange unit according to any one of claims 7 to 9, characterized in that: The thickness of a portion of the clamping portion of the sealing clip located in the second limiting hole is reduced.

15. The heat exchange unit as claimed in claim 2, characterized in that: The heat exchange unit further includes an elastic pad, which is arranged between the clamping portion and the panel.

16. The heat exchange unit according to any one of claims 3 to 9 or 11 or 12, characterized in that: The heat exchange unit further includes an elastic pad, which is arranged between the clamping portion and the panel and / or between the connecting portion and the main retaining member.

17. The heat exchange unit according to any one of claims 7 to 9, characterized in that: The heat exchange unit further includes an elastic pad, which is arranged between the connecting portion and the pressing plate.

18. The heat exchange unit according to any one of claims 1 to 9 or 11 or 12, characterized in that: A sealing ring is provided at the connection between the heat exchange plate tube and the front sealing plate and / or the rear sealing plate, and the heat exchange unit also includes a plurality of pressure strips for crimping the sealing ring to the front sealing plate and / or the rear sealing plate, and the pressure strip is integral or split. When the pressure strip is split, the pressure strip includes a plurality of sub-pressure strips, and the sub-pressure strip is provided with a C-shaped opening on at least one side along the first direction, and the C-shaped openings of two adjacent sub-pressure strips surround the same heat exchange plate tube, or the plurality of sub-pressure strips are respectively provided with one or more annular openings for surrounding the same heat exchange plate tube.

19. An air preheater, characterized in that: The air preheater comprises: A housing, the housing comprising a front end plate and a rear end plate arranged opposite to each other and a fixing member for fixing the front end plate and the rear end plate, the front end plate and the rear end plate respectively having at least one first mounting opening and a second mounting opening opposite to each other; and at least one heat exchange unit, the heat exchange unit being arranged between the first mounting opening and the second mounting opening, the front sealing plate and the rear sealing plate of the heat exchange unit being connected to the front end plate and the rear end plate respectively; Wherein, the heat exchange unit is the heat exchange unit according to any one of claims 1-18.

20. The air preheater according to claim 19, characterized in that Each of the heat exchange units is equipped with a guiding device for guiding the heat exchange unit into the shell, the guiding device includes a moving component installed on the heat exchange unit and a guide rail component installed on the shell, the guide rail component includes a guide rail support and a guide rail, the guiding direction of the guide rail is set in a direction perpendicular to the front end plate, one end of the guide rail and one end of the guide rail support are respectively fixed on both sides of the shell along the guiding direction, and the other end of the guide rail and the guide rail support are movably connected.

21. The air preheater according to claim 20, characterized in that The guide rail support and the guide rail are overlapped, and the guiding device further comprises a threaded fastener. The overlapped portions of the guide rail support and the guide rail are respectively provided with connecting holes for inserting the threaded fasteners. At least one of the connecting holes on the guide rail support and the guide rail is an elongated hole extending along the guiding direction of the guide rail assembly; or, one of the guide rail support and the guide rail is a cylindrical structure axially along the third direction, and the other extends into the cylindrical structure.

22. The air preheater according to claim 21, characterized in that The cross-sectional shapes of the guide rail support and the guide rail have openings in the same direction, thereby forming an overlap, and the cross-sectional shape includes any one of the following: V-shaped, C-shaped, U-shaped and trapezoidal.

23. The air preheater according to claim 20, characterized in that The support member of the air preheater includes a pillar with a U-shaped cross-section perpendicular to the third direction, and the two ends of the pillar are respectively connected to the front sealing plate and the rear sealing plate. The moving component includes a connecting shaft and a roller sleeved on the connecting shaft, and the two ends of the connecting shaft are connected to the pillar along the first direction, and the roller is located in the U-shaped opening of the pillar.

24. The air preheater according to any one of claims 20 to 23, characterized in that: The outer circumferential size of the first mounting port is larger than the outer circumferential size of the rear sealing plate, and the outer circumferential sizes of the first mounting port and the second mounting port are smaller than the outer circumferential sizes of the front sealing plate and the rear sealing plate, respectively, so that after the heat exchange unit enters the shell, the front sealing plate and the rear sealing plate are respectively attached to the outer surface of the front end plate and the inner surface of the rear end plate along the entry direction, and annular sealing gaskets are respectively provided between the front sealing plate and the front end plate and between the rear sealing plate and the rear end plate.

25. The air preheater according to claim 24, characterized in that An enclosure for accommodating the heat exchange unit is formed on the inner plate surface of the rear end plate, and the annular sealing gasket is located between the rear sealing plate and the rear end plate and in the enclosure. When the heat exchange unit is pushed along the guiding direction of the guide device, the rear sealing plate enters the enclosure, and when the front sealing plate is fixedly pressed against the front end plate, the rear sealing plate and the rear end plate are pressed simultaneously.

26. The air preheater according to claim 25, characterized in that When the front sealing plate is fixedly pressed against the front end plate, the rear sealing plate of the heat exchange unit is only pressed and connected against the rear end plate.

27. The air preheater according to claim 20, characterized in that A notch is provided at the edge of the first mounting opening of the front end plate for allowing the moving component to pass through.

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