Tubular heat exchanger

Abstract

The invention relates to the technical field of heat exchangers, in particular to a tubular heat exchanger which comprises a shell, a scale dissolving assembly is mounted in the shell and comprises a push plate, a scale dissolving plate and a scale dissolving spring, and the push plate is slidably mounted in the shell; the scale dissolving plate is located on the side, away from the push plate, of the baffle plate. The push plate and the scale dissolving plate are each provided with a sliding hole allowing the tube bundle to penetrate through. The push plate is fixedly connected with the connecting column; the outer surface of the tube bundle is sleeved with a scale-dissolving spring, one end of the scale-dissolving spring is fixed to the push plate or the scale-dissolving plate, and the other end of the scale-dissolving spring is a free end. The push plate, the scale removing plate and the spring are ingeniously added in the shell, dirt on the inner surface of the shell and the outer surface of the tube bundle can be cleaned away through driving movement of the cleaning liquid, the heat exchanger does not need to be detached from a heat exchange system, and the heat exchange efficiency is improved. Dirt in the shell can be frequently removed only by controlling the flow of the condensate, the hot fluid and the cleaning fluid, so that the heat exchange efficiency of the outer surface of the tube bundle is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, in particular to a tubular heat exchanger. Background Art

[0002] Tubular heat exchangers are mainly used in the heating, cooling and temperature regulation processes of chemical, electric power, metallurgy, textile, food and other industries. The cold liquid in the tube shell and the hot liquid in the tube bundle exchange heat through the tube wall as the conduction surface. After working for a period of time under harsh conditions such as high temperature, high pressure and high flow rate, the traditional tubular heat exchanger will accumulate dirt on the inner wall of the tube shell and the outer wall of the tube bundle. These dirts are tightly adsorbed on the inner wall of the tube shell and the outer wall of the tube bundle and the inner wall of the tube bundle, which not only affects the heat exchange efficiency of the heat exchange tube, but also easily causes corrosion to the parts in the heat exchanger, especially the corrosion of the welding parts between the tube bundle and the tube sheet, which easily causes the mixing of cold liquid and hot liquid and causes liquid pollution. When the dirt accumulates to a certain extent, it can be cleaned, which makes the heat exchange efficiency of the heat exchanger lower and lower. The heat exchanger needs to be cleaned to restore the set heat exchange efficiency, which greatly reduces the actual heat exchange effect of the heat exchanger.

[0003] As for cleaning the heat exchanger, the existing practice is mostly to remove the heat exchanger from the heat exchange system, then disassemble the heat exchanger and use high-pressure water to flush the dirt inside the heat exchanger to achieve the purpose of removing the dirt. However, the above method requires manual cleaning, which is time-consuming and labor-intensive, and the heat exchange system also needs to be shut down to wait for the heat exchanger to be cleaned, which has a great impact on the work of the heat exchange system.

[0004] In view of the above situation, the present invention designs a tubular heat exchanger, which can regularly clean the dirt inside the heat exchanger without disassembling the heat exchanger, so that the heat exchanger always maintains a high heat exchange efficiency; and can effectively avoid corrosion at the welding parts of the tube bundle and the tube sheet, so as to extend the service life of the heat exchanger. Summary of the invention

[0005] The purpose of the present invention is to provide a tubular heat exchanger, mainly to solve the technical problem that the heat exchange efficiency is affected by the accumulation of dirt in the heat exchanger to a certain extent.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a tubular heat exchanger, comprising a shell, a tube head, a tube tail, a tube bundle, a baffle, a descaling assembly and a tube sheet, wherein the shell is a tubular structure, and a water inlet and a water outlet are arranged at both ends of the shell, and a plurality of baffles are evenly arranged along the length direction of the tube bundle, the tube bundle is arranged in the shell, and the tube sheet is located outside the shell, and two tube sheets are respectively sealed and fixed to the two ends of the tube bundle, and are arranged in the order of the tube head, the tube sheet, the shell, the tube sheet and the tube tail;

[0008] A descaling assembly is installed in the shell, and the descaling assembly is used to clean the dirt inside the shell and the outer wall of the tube bundle. The descaling assembly includes a push plate, a descaling plate, a support bundle, a connecting column and a descaling spring. The push plate is a disc-shaped structure, which is slidably installed in the shell and has a gap with the shell. The push plate is axially provided with a support bundle that supports the push plate to slide along the inner wall of the shell; and a pressure chamber is formed between the push plate and the tube plate on the side close to the water inlet, and a liquid injection port connected to the pressure chamber is provided on the shell; the descaling plate has the same shape as the baffle plate, The descaling plate is located on the side of the baffle away from the push plate, a gap is set between the arc edge of the descaling plate and the inner wall of the shell, and a support bundle in contact with the inner wall of the shell is provided on the arc edge of the descaling plate; sliding holes are opened on the push plate and the descaling plate, and a support bundle in contact with the tube bundle is fixed axially along the sliding hole, and the push plate and the descaling plate slide along the tube bundle through the support bundle; the push plate is fixedly connected to a plurality of descaling plates through a connecting column; a descaling spring is fitted on the outer surface of the tube bundle, one end of the descaling spring is fixed to the push plate or the descaling plate, and the other end of the descaling spring is a free end.

[0009] Preferably, the descaling spring comprises a body and a heat conductor wrapped around the outside of the body, the cross-section of the heat conductor is a trapezoidal structure, and the long bottom side of the heat conductor is in contact with the outer wall of the tube bundle.

[0010] Preferably, the long bottom edge of the heat conductor is provided with a plurality of embedding grooves spaced apart along the length direction, the plurality of embedding grooves have no gaps in the expansion and contraction direction of the descaling spring, and scrapers contacting the outer surfaces of the heat exchange tubes constituting the tube bundle are embedded in the embedding grooves.

[0011] Preferably, the tube bundle is provided with annular grooves at uniform intervals along the length direction, a split magnetic ring is fixed in the annular groove, and the outer wall of the magnetic ring is coplanar with the outer wall of the tube bundle.

[0012] Preferably, fixing claws are evenly extended axially outward from both ends of the magnetic ring, transition arcs are provided between adjacent fixing claws, fixing grooves matching with the fixing claws are provided at both ends of the annular groove, and the magnetic ring is bonded in the annular groove by glue.

[0013] Preferably, the support bundle radiates outward axially and radially with the fixed end as a reference and extends to the support surface, and the support bundle supports the push plate and the descaling plate without bending; the free ends of the support rods constituting the support bundle are in surface contact with the support surface.

[0014] Preferably, sleeves corresponding to the position and number of the tube bundle are arranged in the tube head and the tube tail, the inner hole diameter of the sleeve is equal to the outer diameter of the heat exchange tube constituting the tube bundle, a side water inlet groove is provided in the middle of the sleeve, and one end of the sleeve is an extended end extending through the extended tube head and the tube tail, a sealing screw plug is screwed on the extended end, and the extended end is welded and connected to the tube head and the tube tail, and the other end of the sleeve is an inserted end inserted into the tube bundle; a sealing gasket is installed between the tube sheet and the tube head and the tube tail, and the sealing gasket is made of waterproof silicone rubber. Silicone rubber is heat-resistant and cold-resistant and can play a waterproof role in the hot and cold environments of the tubular heat exchanger. The sealing gasket is provided with sealing holes for the heat exchange tubes constituting the tube bundle to pass through, and the inserted end of the sleeve presses the sealing gasket against the tube sheet.

[0015] Preferably, the inner hole of the insertion end of the sleeve is provided with a clamping bevel; the tube bundle extends out of the tube sheet and is welded to the tube sheet to form a raised weld; and the aperture of the sealing hole is slightly smaller than the outer diameter of the heat exchange tubes constituting the tube bundle, so that the sealing gasket can cover the weld, and a pressure-bearing bevel that fits the clamping bevel is provided on the side of the sealing hole away from the tube sheet.

[0016] Preferably, the side water inlet groove does not penetrate the sleeve, and the opening direction of the side water inlet groove is parallel to the axial direction of the lower interface of the pipe head.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention cleverly adds a push plate, a descaling plate and a spring in the shell, and uses a cleaning liquid to drive the movement to clean the dirt on the inner surface of the shell and the outer surface of the tube bundle. There is no need to remove the heat exchanger from the heat exchange system, and there is no need to disassemble the heat exchanger. The dirt in the shell can be regularly removed by controlling the flow of condensate, hot fluid and cleaning liquid to ensure the heat exchange efficiency of the outer surface of the tube bundle.

[0019] 2. The inventive sleeve is cleverly designed to remove dirt from the inner wall of the tube bundle without disassembling the heat exchanger, thereby greatly improving the cleaning efficiency. On the other hand, it can cooperate with the sealing gasket to protect the connection between the tube sheet and the tube bundle to prevent corrosion. Most importantly, the design of the water inlet groove on the upper side of the sleeve can deposit dirt first, and the sleeve can be pre-blocked before the tube bundle is blocked, thereby facilitating the unblocking of the tube bundle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] The above and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0022] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0023] Figure 2 for Figure 1 Another working state diagram of ;

[0024] Figure 3 It is a schematic diagram of the structure of the descaling assembly of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the descaling spring of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the heat exchange tube of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of a half magnetic attraction ring of the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the pipe tail of the present invention;

[0029] Figure 8 It is a schematic diagram of the connection structure between the sleeve and the tube bundle of the present invention;

[0030] Fig. 9 It is a structural schematic diagram of the sleeve of the present invention;

[0031] Fig.10 for Fig. 9 Middle AA section view.

[0032] In the figure: 1. Shell; 11. Water inlet; 12. Water outlet; 13. Liquid injection port; 2. Pipe head; 21. Upper interface; 22. Lower interface; 23. Isolation plate; 3. Pipe tail; 4. Tube bundle; 41. Annular groove; 42. Magnetic ring; 43. Fixed claw; 44. Fixed groove; 5. Baffle; 6. Descaling assembly; 61. Push plate; 611. Pressure chamber; 62. Descaling plate; 63. Support bundle; 64. Connecting column; 65. Descaling spring; 651. Main body; 652. Heat conductor; 653. Shovel; 66. Sliding hole; 7. Tube sheet; 71. Weld; 8. Sealing gasket; 81. Sealing hole; 82. Pressure-bearing slope; 9. Sleeve; 91. Side water inlet groove; 92. Extending end; 93. Inserting end; 931. Pressing slope. DETAILED DESCRIPTION

[0033] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] like Figures 1 to 10 As shown, a tubular heat exchanger disclosed in the present invention comprises a shell 1, a tube head 2, a tube tail 3, a tube bundle 4, a baffle 5, a descaling assembly 6 and a tube sheet 7. The shell 1 is a tubular structure, and a water inlet 11 and a water outlet 12 are arranged at both ends of the shell 1. The tube bundle 4 is evenly arranged with a plurality of baffles 5 along the length direction. The baffles 5 support the tube bundle 4 to maintain a fixed position in the shell 1, enhance the turbulence of the condensate, and make the condensate repeatedly pass through the tube bundle 4 horizontally between the baffles 5 for many times; the tube bundle 4 is arranged in the shell 1, and the condensate enters the shell from the water inlet 11 of the shell 1, and flows out from the water outlet 12 after heat exchange with the hot liquid in the tube bundle 4. ; The tube sheet 7 is located outside the shell 1, and the two tube sheets 7 are sealed and fixed to the two ends of the tube bundle 4 respectively, and are arranged in the order of the tube head 2, the tube sheet 7, the shell 1, the tube sheet 7 and the tube tail 3; The side wall of the tube head 2 is provided with a lower interface 22 and an upper interface 21 for the inflow and outflow of the heating liquid, and two parallel isolation plates are provided inside the tube head 2, and an isolation plate is also provided inside the tube tail 3. The isolation plates at two positions can realize multiple deflections of the hot liquid in the tube bundle 4, thereby improving the heat exchange effect; Flanges are provided on the tube head 2 and the tube tail 3, and bolt holes 23 are provided on the flanges. The tube head 2 and the tube tail 3 are fixed together with the shell 1 and the tube sheet 7 through the bolt holes 23;

[0035] like Figure 1 and Figure 3 As shown, a descaling assembly 6 is installed in the shell 1, and the descaling assembly 6 is used to remove dirt inside the shell 1 and the outer wall of the tube bundle 4. The descaling assembly 6 includes a push plate 61, a descaling plate 62, a support bundle 63, a connecting column 64 and a descaling spring 65. The push plate 61 is a disc-shaped structure, and the push plate 61 is slidably installed in the shell 1, and a gap is set between the push plate 61 and the shell 1. The push plate 61 is axially provided with a support bundle 63 that supports the push plate 61 to slide along the inner wall of the shell 1; and a pressure chamber 611 is formed between the push plate 61 and the tube plate 7 on the side close to the water inlet 11, and a liquid injection port 13 connected to the pressure chamber 611 is provided on the shell 1; the descaling plate 62 has the same shape as the baffle 5 The descaling plate 62 is located on the side of the baffle plate 5 away from the push plate 61, and a gap is set between the arc edge of the descaling plate 62 and the inner wall of the shell 1, and a support bundle 63 in contact with the inner wall of the shell 1 is provided on the arc edge of the descaling plate 62; sliding holes 66 are opened on the push plate 61 and the descaling plate 62, and a support bundle 63 in contact with the tube bundle 4 is fixed axially along the sliding hole, and the push plate 61 and the descaling plate 62 slide along the tube bundle 4 through the support bundle 63; the push plate 61 is fixedly connected to multiple descaling plates 62 through a connecting column 64; a descaling spring 65 is fitted on the outer surface of the tube bundle 4, one end of the descaling spring 65 is fixed to the push plate 61 or the descaling plate 62, and the other end of the descaling spring 65 is a free end.

[0036] When in use, the water supply of condensate and hot liquid is disconnected, the water inlet 11 is closed, the water outlet 12 is connected to the sewage collection pipe, and then the cleaning liquid is injected into the pressure chamber 611 through the liquid injection port 13. The cleaning liquid pushes the push plate 61 and the descaling plate 62 along the length direction of the tube bundle 4. The support bundle 63 supports the push plate 61 and the descaling plate 62 to avoid the push plate 61 and the descaling plate 62 from getting stuck. On the other hand, the cleaning liquid can pass through the support bundle 63 to rinse the cleaned dirt, and finally clean the tube bundle 4. The liquid flows into the sewage collection pipe through the water outlet 12; the push plate 61 and the descaling plate 62 can slide along the tube bundle 4 with the descaling spring 65. Each heat exchange tube constituting the tube bundle 4 is wound with a descaling spring 65, and the inner diameter of the descaling spring 65 is equal to the outer diameter of the heat exchange tube, so that the descaling spring 65 can fit on the outer surface of the heat exchange tube and clean the dirt on the outer surface of the heat exchange tube when the descaling spring 65 moves, avoiding scaling on the outer surface of the heat exchange tube, thereby greatly slowing down the rate of decline of the heat exchange efficiency of the heat exchanger. When the descaling spring 65 contacts the next baffle 5, the descaling spring 65 is compressed, and the dirt adhered to the surface of the descaling spring 65 can be broken and disintegrated by itself when the descaling spring 65 is deformed; when the push plate 61 and the descaling plate 62 need to be reset, clean water is injected through the water outlet 12, and the clean water pushes the push plate 61 to compress the pressure chamber 611, and the clean water in the pressure chamber 611 is discharged through the liquid injection port 13, so that the reset can be achieved. Then clean water is injected into the water inlet 11 to flush away the dirt cleaned from the inside of the shell 1 and is discharged into the sewage collection pipe through the water outlet 12.

[0037] like Figure 4 As shown, the descaling spring 65 includes a body 651 and a heat conductor 652 wrapped outside the body 651. The cross-sectional shape of the heat conductor 652 is a trapezoidal structure, and the long bottom side of the heat conductor 652 contacts the outer wall of the tube bundle 4. The heat conductor 652 has three contact surfaces with the condensate, which have a larger contact area than the contact surface on the tube bundle 4 covered by the heat conductor 652, and thus have better heat exchange efficiency; the two trapezoidal bottom corners of the heat conductor 652 extend outward to form a shovel angle, which can clean the dirt on the outer surface of the tube bundle 4 when the descaling spring 65 moves, and the cleaned dirt can be washed away by water to maintain the cleanliness of the outer surface of the tube bundle 4, thereby slowing down the reduction of the heat exchange efficiency of the heat exchanger. The main body 651 is a traditional compression spring made of spring steel to ensure that the descaling spring 65 has good elasticity for a long time; the heat conductor 652 can be made of metals with good thermal conductivity such as copper and aluminum. The heat conductor 652 can make up for the occupied outer surface of the tube bundle 4 to ensure the heat exchange effect.

[0038] like Figure 4As shown, the long bottom edge of the heat conductor 652 is provided with a plurality of embedding grooves spaced apart along the length direction, and the plurality of embedding grooves have no gaps in the extension and contraction direction of the descaling spring 65. The embedding grooves are inlaid with scrapers 653 in contact with the outer surfaces of the heat exchange tubes constituting the tube bundle 4. The scrapers 653 can remove stubborn dirt on the surfaces of the heat exchange tubes to improve the cleaning effect. The plurality of scrapers 653 can form at least one complete circle in the circumferential extension and contraction direction of the descaling spring 65, thereby achieving comprehensive removal of dirt on the surfaces of the heat exchange tubes to slow down the rate of decrease in the heat exchange efficiency of the heat exchange tubes.

[0039] like Figure 5 As shown, the tube bundle 4 is provided with annular grooves 41 at even intervals along the length direction, and a split magnetic ring 42 is fixed in the annular groove 41, and the outer wall of the magnetic ring 42 is coplanar with the outer wall of the tube bundle 4. When the descaling spring 65 is in motion, the magnetic ring 42 can generate resistance to the descaling spring 65 to achieve a certain degree of compression of the descaling spring 65. When the elastic force of the descaling spring 65 is greater than the magnetic attraction of the magnetic ring 42 to the descaling spring 65, the elastic force of the descaling spring 65 is suddenly released to impact the dirt on the surface of the tube bundle 4, which is more conducive to removing the dirt.

[0040] like Figure 5 and Figure 6 As shown, the two ends of the magnetic ring 42 extend fixed claws 43 at uniform intervals outward along the axial direction, and transition arcs are arranged between adjacent fixed claws 43. The transition arcs can avoid stress concentration between adjacent fixed claws 43 and are conducive to the closure of magnetic lines of force. The top of the fixed claw 43 is chamfered, which is also conducive to the closure of magnetic lines of force. The two ends of the annular groove 41 are provided with fixed grooves 44 that match the fixed claws 43. Through the design of the fixed claws 43 and the fixed grooves 44, the deficiency of weakening the structural strength of the tube bundle 4 at this position caused by the opening of the annular groove 41 can be compensated to ensure the structural strength of the tube bundle 4. The magnetic ring 42 is bonded in the annular groove 41 by glue. While ensuring sufficient connection strength, the gap between the magnetic ring 42 and the annular groove 41 can be minimized, so that more magnetic rings 42 can be located in the annular groove 41, ensuring that the magnetic ring 42 has sufficient magnetic attraction.

[0041] like Figure 1As shown, the support bundle 63 is axially and radially extended outwardly and extended to the support surface (i.e., the outer circumferential surface of the push plate 61 and the descaling plate 62 and the inner wall of the sliding hole 66) based on the fixed end (i.e., the outer circumferential surface of the push plate 61 and the descaling plate 62 and the inner wall of the sliding hole 66), and the support bundle 63 supports the push plate 61 and the descaling plate 62 without bending; the free end of the support rod constituting the support bundle 63 is in surface contact with the support surface, which can avoid point contact scratching the support surface on the one hand, and on the other hand, the free end of the support rod sliding against the support surface is conducive to removing dirt to improve the descaling effect. The support bundle 63 is preferably made of synthetic fiber or plastic products to avoid scratching the outer surface of the tube bundle 4.

[0042] like Figure 1 , Figure 2 , Figures 8 to 10 As shown, sleeves 9 corresponding to the positions and quantities of the tube bundles 4 are arranged in the tube heads 2 and the tube tails 3. The inner diameter of the sleeves 9 is equal to the outer diameter of the heat exchange tubes constituting the tube bundle 4. A side water inlet groove 91 is provided in the middle of the sleeves 9, and one end of the sleeves 9 is an extended end 92 extending through the extended tube heads 2 and the tube tails 3. A sealing screw plug is screwed on the extended end 92, and the extended end 92 is welded and connected to the tube heads 2 and the tube tails 3. The other end of the sleeves 9 is an inserted end 93 inserted into the tube bundle 4. A sealing gasket 8 is installed between the tube sheet 7 and the tube heads 2 and the tube tails 3. The sealing gasket 8 is provided with sealing holes 81 for the heat exchange tubes constituting the tube bundle 4 to pass through. The inserted end 93 of the sleeves 9 presses the sealing gasket 8 against the tube sheet 7.

[0043] The tube sheet 7 and the tube bundle 4 are generally connected by welding, but defects in welding often cause the weld 71 to be pierced after long-term use, resulting in mixing of cold and hot water, causing the heat exchanger to be scrapped. The present invention uses a sleeve 9 to seal and press the sealing gasket 8 against the weld 71 to protect the weld 71, thereby preventing liquid from contacting the weld 71, thereby achieving the effect of extending the service life of the heat exchanger; in addition, the present invention extends the other end of the sleeve 9 out of the tube head 2 and the tube tail 3. When the heat exchanger needs to be cleaned, it is only necessary to unscrew the screw plug on the sleeve 9 and extend the high-pressure water gun along the sleeve 9 into the heat exchange tubes that constitute the tube bundle 4 to clean each heat exchange tube. It is not necessary to disassemble the tube head 2 and the tube tail 3 of the heat exchanger for cleaning, making the cleaning of the heat exchanger convenient and quick, and avoiding the problem of reduced sealing of the heat exchanger due to frequent disassembly and assembly of the heat exchanger.

[0044] The inner hole of the insertion end 93 of the sleeve 9 is provided with a pressing bevel 931; the tube bundle 4 extends out of the tube sheet 7 and is welded to the tube sheet 7 to form a raised weld 71; and the aperture of the sealing hole 81 is slightly smaller than the outer diameter of the heat exchange tubes constituting the tube bundle 4, so that the sealing gasket 8 can cover the weld 71, and the side of the sealing hole 81 away from the tube sheet 7 is provided with a pressure-bearing bevel 82 that fits with the pressing bevel 931. On the one hand, the pressure-bearing bevel 82 has a guiding function to guide the sleeve 9 to press the sealing gasket 8 to avoid wrinkles. On the other hand, the pressure-bearing bevel 82 as a sealing surface cooperates with the pressing bevel 931 to provide a longer sealing surface to improve the sealing effect. The raised weld 71 can cooperate with the pressing bevel 931 to press the sealing gasket 8 to avoid the formation of gaps between the sealing gasket 8 and the tube sheet 7 and the heat exchange tubes constituting the tube bundle 4, resulting in poor sealing.

[0045] The side water inlet groove 91 does not penetrate the sleeve 9, and the opening direction of the side water inlet groove 91 faces the water flow. The reserved part of the sleeve 9 opposite to the side water inlet groove 91 is in direct contact with the water flow and deposits dirt first, so that the reserved part can block the sleeve 9 before the tube bundle 4 is completely blocked, and the early warning of dirt blockage is realized at the sleeve 9, which can avoid the situation that the tube bundle 4 is blocked and the water flow cannot flow, which is not conducive to high-pressure flushing. The blocked part in the sleeve 9 is relatively close to the protruding end 92 of the sleeve 9, which is very convenient for cleaning and dredging. After the sleeve 9 is dredged, the inner wall of the tube bundle 4 can be flushed with high-pressure water, which is more convenient than the existing technology. In order to ensure the effect of depositing dirt first, a rough surface can be set at the reserved part to facilitate the adhesion of dirt.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A tubular heat exchanger, comprising a shell (1), a tube head (2), a tube tail (3), a tube bundle (4), a baffle (5), a descaling assembly (6) and a tube sheet (7), wherein the shell (1) is a tubular structure, and a water inlet (11) and a water outlet (12) are arranged at both ends of the shell (1); a plurality of baffles (5) are evenly arranged along the length direction of the tube bundle (4); the tube bundle (4) is arranged in the shell (1), and the tube sheet (7) is located outside the shell (1); two tube sheets (7) are respectively sealed and fixed to both ends of the tube bundle (4), and are arranged in sequence in the order of the tube head (2), the tube sheet (7), the shell (1), the tube sheet (7) and the tube tail (3); Features: A descaling assembly (6) is installed in the shell (1). The descaling assembly (6) is used to clean the dirt inside the shell (1) and the outer wall of the tube bundle (4). The descaling assembly (6) comprises a push plate (61), a descaling plate (62), a support bundle (63), a connecting column (64) and a descaling spring (65). The push plate (61) is a disc-shaped structure. The push plate (61) is slidably installed in the shell (1) and a gap is set between the push plate (61) and the shell (1). The push plate (61) is axially provided with a support bundle (63) for supporting the push plate (61) to slide along the inner wall of the shell (1); and a pressure chamber is formed between the push plate (61) and the tube plate (7) on the side close to the water inlet (11). The shell (1) is provided with a liquid injection port (13) connected to the pressure chamber; the descaling plate (62) has the same shape as the baffle plate (5). The descaling plate (61) is axially provided with a support bundle (63) for supporting the push plate (61) to slide along the inner wall of the shell (1). 2) Located on the side of the baffle plate (5) away from the push plate (61), a gap is set between the arc edge of the descaling plate (62) and the inner wall of the shell (1), and a support bundle (63) in contact with the inner wall of the shell (1) is provided on the arc edge of the descaling plate (62); sliding holes (66) are opened on the push plate (61) and the descaling plate (62), and a support bundle (63) in contact with the tube bundle (4) is fixed along the axial direction of the sliding hole (66), and the push plate (61) and the descaling plate (62) slide along the tube bundle (4) through the support bundle (63); the push plate (61) is fixedly connected to the plurality of descaling plates (62) through a connecting column (64); a descaling spring (65) is fitted on the outer surface of the tube bundle (4), one end of the descaling spring (65) is fixed to the push plate (61) or the descaling plate (62), and the other end of the descaling spring (65) is a free end.

2. A tubular heat exchanger according to claim 1, characterized in that: The descaling spring (65) comprises a main body (651) and a heat conductor (652) wrapped around the outside of the main body (651). The cross-sectional shape of the heat conductor (652) is a trapezoidal structure, and the long bottom side of the heat conductor (652) is in contact with the outer wall of the tube bundle (4).

3. A tubular heat exchanger according to claim 2, characterized in that: The long bottom edge of the heat conductor (652) is provided with a plurality of embedding grooves spaced apart along the length direction, the plurality of embedding grooves having no gap in the extension and contraction direction of the descaling spring (65), and a scraper (653) in contact with the outer surface of the heat exchange tube constituting the tube bundle (4) is embedded in the embedding groove.

4. A tubular heat exchanger according to claim 3, characterized in that: The tube bundle (4) is provided with annular grooves (41) at even intervals along the length direction, a split magnetic attraction ring (42) is fixed in the annular groove (41), and the outer wall of the magnetic attraction ring (42) is coplanar with the outer wall of the tube bundle (4).

5. A tubular heat exchanger according to claim 4, characterized in that: The two ends of the magnetic attraction ring (42) extend outwardly along the axial direction at even intervals to form fixed claws (43), and transition arcs are provided between adjacent fixed claws (43). The two ends of the annular groove (41) are provided with fixed grooves (44) that match the fixed claws (43), and the magnetic attraction ring (42) is bonded in the annular groove (41) by glue.

6. A tubular heat exchanger according to claim 1 or 5, characterized in that: The support bundle (63) radiates outward in the axial and radial directions with the fixed end as a reference and extends to the support surface. The support bundle (63) supports the push plate (61) and the descaling plate (62) without bending. The free ends of the support rods constituting the support bundle (63) are in surface contact with the support surface.

7. A tubular heat exchanger according to claim 6, characterized in that: The tube head (2) and the tube tail (3) are provided with sleeves (9) corresponding to the position and number of the tube bundle (4). The inner diameter of the sleeve (9) is equal to the outer diameter of the heat exchange tubes constituting the tube bundle (4). A side water inlet groove (91) is provided in the middle of the sleeve (9). One end of the sleeve (9) is an extended end (92) extending out and passing through the extended tube head (2) and the tube tail (3). A sealing screw plug (94) is screwed on the extended end (92). The extended end (92) is welded to the tube head (2) and the tube tail (3); the other end of the sleeve (9) is an insertion end (93) inserted into the tube bundle (4); a sealing gasket (8) is installed between the tube sheet (7) and the tube head (2) and the tube tail (3); a sealing hole (81) is provided on the sealing gasket (8) for the heat exchange tubes constituting the tube bundle (4) to pass through; the insertion end (93) of the sleeve (9) presses the sealing gasket (8) against the tube sheet (7).

8. A tubular heat exchanger according to claim 7, characterized in that: The inner hole of the insertion end (93) of the sleeve (9) is provided with a pressing bevel (931); the tube bundle (4) extends out of the tube sheet (7) and is welded to the tube sheet (7) to form a raised weld (71); and the aperture of the sealing hole (81) is slightly smaller than the outer diameter of the heat exchange tubes constituting the tube bundle (4), so that the sealing gasket (8) can cover the weld (71); and a pressure-bearing bevel (82) that fits the pressing bevel (931) is provided on the side of the sealing hole (81) away from the tube sheet (7).

9. A tubular heat exchanger according to claim 8, characterized in that: The side water inlet groove (91) does not penetrate the sleeve (9), and the opening direction of the side water inlet groove (91) is parallel to the axial direction of the lower interface (22) of the pipe head (2).

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