Small-tube-pass U-shaped double-pipe heat exchanger
By using a combined design of U-tube, casing and sealing components in U-tube heat exchanger, the problem of insufficient sealing at the tube and shell connection is solved, which significantly reduces leakage and improves the sealing and reliability of the equipment. sex.
Patent Information
- Application Number
- CN202421048592.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-14
AI Technical Summary
During the installation and use of existing U-shaped casing heat exchangers, the sealing at the two ends of the tube and shell cannot be guaranteed, and leakage is prone to occur.
The design of the first and second sealing components including a U-tube, two sleeves, each end of each sleeve is achieved by sealing the tube, flanges, positioning rings and sealing rings to reduce leakage risk.
It effectively improves the sealing at the connection between the two ends of the tube and the shell, reduces leakage, and enhances the reliability of the equipment.
Smart Images
Figure CN222257901U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of U-tube heat exchangers, and in particular to a small-tube U-tube heat exchanger. Background Art
[0002] U-tube heat exchanger, also called U-tube heat exchanger, is a kind of shell and tube heat exchanger. It belongs to petrochemical equipment. It is composed of main components such as tube box, shell and tube bundle. It is named because its heat exchange tube is U-shaped. U-tube heat exchanger has only one tube sheet, and both ends of the tube are fixed on the same tube sheet. The characteristics of this type of heat exchanger are that the tube bundle can be freely extended and contracted, and no thermal stress will be generated due to the temperature difference between the tube and shell, and the thermal compensation performance is good; the tube pass is double tube pass, the process is long, the flow rate is high, and the heat transfer performance is good; the pressure bearing capacity is strong; the tube bundle can be withdrawn from the shell, which is convenient for maintenance and cleaning, and the structure is simple and the cost is low. However, it is inconvenient to clean the tube, and the tubes in the middle part of the tube bundle are difficult to replace. Because the bending radius of the innermost tube cannot be too small, the pipe layout in the center of the tube sheet is not compact, so the number of tubes cannot be too many, and there is a gap in the center of the tube bundle, which makes the shell fluid easy to short-circuit and affect the shell heat exchange. In addition, in order to compensate for the thinning of the tube wall after bending, the straight tube part needs to use a thicker wall tube. This affects its use occasions, and it is only suitable for situations where the temperature difference between the tube shell and the wall is large, or the shell side medium is easy to scale while the tube side medium is clean and not easy to scale, high temperature, high pressure, and strong corrosiveness.
[0003] During the installation and use of the U-shaped tube heat exchanger in the prior art, the sealing of the connection between the two ends of the tube shell cannot be guaranteed, and leakage is likely to occur. Utility Model Content
[0004] The embodiment of the present application provides a small-tube U-tube heat exchanger, which solves the technical problem in the prior art that the sealing of the connections at both ends of the tube shell cannot be guaranteed during installation and use, and leakage is prone to occur. The sealing of the connections at both ends of the tube shell can be effectively improved, and leakage can be reduced.
[0005] The utility model provides a small-tube U-shaped shell and tube heat exchanger, comprising a U-shaped tube, two shells arranged outside the straight tube body of the U-shaped tube, and a first sealing assembly and a second sealing assembly arranged at both ends of each of the shells; the ends of the two shells away from the bending part of the U-shaped tube are radially opened outward with through openings, and the ends of the two shells close to the bending part of the U-shaped tube are connected in the radial direction; the first sealing assembly comprises a first sealing tube, a first flange, a second flange, a first positioning ring and a first sealing ring; one end of the first sealing tube is integrally connected to one end of the U-shaped tube, the first flange is sleeved on the outside of the first sealing tube and is integrally connected to the end of the shell, and the first positioning ring is clamped between the inner side of the first flange and the outer side of the first sealing tube; the The second flange is sleeved on the outer side of the first sealing tube, and the first sealing ring is arranged between the first flange and the second flange, and the first flange and the second flange are detachably connected; the second sealing assembly includes a second sealing tube, a third flange, a fourth flange and a second sealing ring; the second sealing tube is sleeved on the outer side of the tube body of the U-shaped tube and is integrally connected to the outer side of the U-shaped tube; the end of the sleeve close to the bending part of the U-shaped tube abuts against the end of the second sealing tube and is integrally connected with the third flange, and the inner side of the third flange is sleeved on the outer side of the second sealing tube; the fourth flange is sleeved on the outer side of the second sealing tube, and the second sealing ring is arranged between the fourth flange and the third flange, and the third flange and the fourth flange are detachably connected.
[0006] In a possible implementation, a small-tube U-type shell and tube heat exchanger provided by an embodiment of the utility model also includes a third sealing assembly, which includes a third sealing tube, a fifth flange, a sixth flange, a second positioning ring and a third sealing ring; the outer side of the third sealing tube is sleeved with the fifth flange and can be clamped with the fifth flange in the axial direction; the sixth flange and the second positioning ring are both sleeved on the outer side of the first sealing tube, and the sixth flange and the second positioning ring can be clamped in the axial direction; the third sealing ring is arranged between the first sealing tube and the third sealing tube.
[0007] In a possible implementation manner, a shock absorbing block is provided between the outer side of the U-shaped tube and the inner side of the sleeve.
[0008] In a possible implementation, the second sealing ring includes a flexible graphite packing and a metal gasket; the flexible graphite packing and the metal gasket are abutted together and are located between the third flange and the fourth flange.
[0009] In a possible implementation manner, the first positioning ring and the second positioning ring have the same structure, and both the first positioning ring and the second positioning ring are composed of two half rings.
[0010] In a possible implementation, a connecting pipe is connected between the ends of the two sleeves near the bending part of the U-shaped tube in the radial direction.
[0011] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:
[0012] The embodiment of the utility model adopts a U-shaped tube, two sleeves arranged outside the straight tube body of the U-shaped tube, a first sealing component and a second sealing component arranged at both ends of each sleeve, and the first sealing component is provided to include a first sealing tube, a first flange, a second flange, a first positioning ring and a first sealing ring. The first flange is clamped in the axial direction by the first positioning ring, wherein the first flange is integrally connected to the end of the sleeve, so that the second flange can be fastened to the first flange by threading the fastening bolts between the first flange and the second flange, and the first sealing ring can be effectively sealed at the same time; the second sealing component is provided to include a second sealing tube, a third flange, a fourth flange and a second sealing ring, the third flange is integrally provided at the end of the sleeve, the end of the sleeve near the bending part of the U-shaped tube abuts against the end of the second sealing tube, the third flange can be fastened to the fourth flange by threading the fastening bolts between the third flange and the fourth flange, and the second sealing ring can be effectively sealed at the same time;
[0013] The invention effectively solves the technical problem that the sealing of the connection between the two ends of the tube shell cannot be guaranteed during the installation and use of the U-shaped shell and tube heat exchanger in the prior art, and leakage is prone to occur. The invention can effectively improve the sealing of the connection between the two ends of the tube shell and reduce the leakage. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0015] Figure 1 A schematic diagram of the structure of a small-tube U-tube heat exchanger provided in an embodiment of the present application;
[0016] Figure 2 for Figure 1 A partial enlarged view of the middle A area;
[0017] Figure 3 for Figure 1 A partial enlarged view of the middle B area;
[0018] Figure 4 for Figure 1 Cross-sectional view along CC direction.
[0019] Icons: 1-U-shaped tube; 2-sleeve; 21-through port; 22-inlet flange; 23-outlet flange; 3-first sealing assembly; 31-first sealing tube; 32-first flange; 33-second flange; 34-first positioning ring; 35-first sealing ring; 4-second sealing assembly; 41-second sealing tube; 42-third flange; 43-fourth flange; 44-second sealing ring; 441-flexible graphite packing; 442-metal gasket; 5-third sealing assembly; 51-third sealing tube; 52-fifth flange; 53-sixth flange; 54-second positioning ring; 55-third sealing ring; 6-shock absorber block; 7-connecting pipe; 8-fastening bolts. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.
[0022] Reference Figure 1-Figure 3The embodiment of the utility model provides a small tube-pass U-shaped shell and tube heat exchanger, comprising a U-shaped tube 1, two shells 2 arranged outside the straight tube body of the U-shaped tube 1, and a first sealing assembly 3 and a second sealing assembly 4 arranged at both ends of each shell 2; the ends of the two shells 2 away from the bending part of the U-shaped tube 1 are radially opened with a through hole 21, and the ends of the two shells 2 close to the bending part of the U-shaped tube 1 are connected in the radial direction; the first sealing assembly 3 comprises a first sealing tube 31, a first flange 32, a second flange 33, a first positioning ring 34 and a first sealing ring 35; one end of the first sealing tube 31 is connected to the end of the straight tube body of the U-shaped tube 1, the first flange 32 is sleeved on the outside of the first sealing tube 31 and is integrally connected with the right end of the shell 2, and a first positioning ring is clamped between the inner side of the first flange 32 and the outer side of the first sealing tube 31 34; the second flange 33 is sleeved on the outer side of the first sealing tube 31, and a first sealing ring 35 is arranged between the first flange 32 and the second flange 33, and the first flange 32 and the second flange 33 are detachably connected; the second sealing assembly 4 includes a second sealing tube 41, a third flange 42, a fourth flange 43 and a second sealing ring 44; the second sealing tube 41 is sleeved on the outer side of the tube body of the U-shaped tube 1 and is integrally connected to the outer wall of the U-shaped tube 1; the end of the sleeve 2 near the bending part of the U-shaped tube 1 is abutted against the end of the second sealing tube 41 and is connected to the third flange 42, and the inner side of the third flange 42 is sleeved on the outer side of the second sealing tube 41; the fourth flange 43 is sleeved on the outer side of the second sealing tube 41, and a second sealing ring 44 is arranged between the fourth flange 43 and the third flange 42, and the third flange 42 and the fourth flange 43 are detachably connected.In the embodiment of the present application, the first sealing tube 31 is integrally formed between the end of the U-shaped tube 1, and the first flange 32 is integrally formed with the end of the sleeve 2. When actually set, the inner diameter of the first sealing tube 31 is the same as the inner diameter of the end of the U-shaped tube 1, and the thickness of the first sealing tube 31 is greater than the thickness of the U-shaped tube 1. A clamping groove is provided on the outer side of the first sealing tube 31, and the first positioning ring 34 is clamped in the clamping groove and the outer edge of the first positioning ring 34 extends out of the clamping groove. A step is provided on the inner side of the first flange 32, and the step can be clamped on the left outer edge end face of the first positioning ring 34, thereby realizing the axial clamping positioning between the first flange 32 and the first sealing tube 31; the second flange 33 and the first flange 32 are fastened by the fastening bolts 8, so that the first sealing ring 35 can be compressed to realize the sealing of one end of the sleeve 2; the second sealing tube 41 is welded on the outer side of the tube body of the U-shaped tube 1 away from the first sealing assembly 3, and the third flange 42 is integrally formed at the end of the sleeve 2 corresponding to the second sealing tube 41. 42 is sleeved on the outside of the second sealing tube 41, and the fourth flange 43 and the third flange 42 are fastened by fastening bolts 8, so that the second sealing ring 44 can be compressed to achieve sealing of the other end of the sleeve 2; therefore, in the small tube-pass U-type sleeve heat exchanger, since energy needs to be provided in the tube-pass U-type tube heat exchange, two identical sleeves 2 need to be arranged on the outside of the straight tube of the U-shaped tube 1, and the first sealing component 3 and the second sealing component 4 are arranged at both ends of each sleeve 2. At the same time, it is necessary to connect the outer sides of the ends of the two sleeves 2 close to the second sealing component 4 in the radial direction so that the heat exchange medium can flow through the two sleeves 2. In actual setting, the inlet flange 22 and the outlet flange 23 can be connected respectively at the through-holes 21 arranged on the two sleeves 2, and the heat exchange medium enters into one of the sleeves 2 through the inlet flange 22 and exchanges heat with the medium in the U-shaped tube 1, and then the heat exchange medium enters into the other sleeve 2, and finally flows out from the outlet flange 23 on the other sleeve 2.
[0023] Reference Figure 2A small-tube U-shaped shell and tube heat exchanger provided by an embodiment of the utility model also includes a third sealing assembly 5, which includes a third sealing tube 51, a fifth flange 52, a sixth flange 53, a second positioning ring 54 and a third sealing ring 55; the outer side of the third sealing tube 51 is sleeved with the fifth flange 52, and can be clamped with the fifth flange 52 in the axial direction; the sixth flange 53 and the second positioning ring 54 are both sleeved on the outer side of the first sealing tube 31, and the sixth flange 53 and the second positioning ring 54 can be clamped in the axial direction; the third sealing ring 55 is arranged between the first sealing tube 31 and the third sealing tube 51. Specifically in the embodiment of the present application, in order to facilitate the connection between the U-shaped tube 1 and the external pipeline, a third sealing assembly 5 is also provided. Similarly, the clamping installation method between the second positioning ring 54 and the sixth flange 53 and the first sealing tube 31 is exactly the same as the clamping installation method between the first flange 32 and the first positioning ring 34 and the first sealing tube 31. A step is also provided on the outer side of the third sealing tube 51, and the fifth flange 52 can abut on the step. The fifth flange 52 and the sixth flange 53 are connected by fastening bolts 8, so that the third sealing tube 51 and the third sealing ring 55 can be pressed against the end face of the first sealing tube 31.
[0024] Reference Figure 1 , Figure 4 A shock-absorbing block 6 is arranged between the outer side of the U-shaped tube 1 and the inner side of the sleeve 2. In the embodiment of the present application, it is further considered that the U-shaped tube 1 has a certain pressure in the internal medium during use, which causes radial shaking and vibration of the U-shaped tube 1 during use, and it is easy for the sealing rings at the connection of the two ends of the sleeve 2 to be worn and damaged, and finally leakage occurs; therefore, a shock-absorbing block 6 is further added between the U-shaped tube 1 and the sleeve 2, and the number of the shock-absorbing blocks 6 can be multiple, and the annular array is arranged on the outer side of the U-shaped tube 1. By arranging the shock-absorbing blocks 6, the shaking and vibration of the U-shaped tube 1 and the sleeve 2 can be effectively reduced.
[0025] Reference Figure 3 The second sealing ring 44 includes a flexible graphite packing 441 and a metal gasket 442; the flexible graphite packing 441 and the metal gasket 442 are abutted together and are located between the third flange 42 and the fourth flange 43. Specifically, in the embodiment of the present application, the second sealing ring 44 does not use a traditional asbestos packing gasket, but is configured as a flexible graphite packing 441 and a metal gasket 442. By configuring the metal gasket 442, the wear resistance of the flexible graphite packing 441 is improved, and leakage caused by damage to the packing can also be prevented.
[0026] Reference Figure 2The first positioning ring 34 and the second positioning ring 54 have the same structure, and the first positioning ring 34 and the second positioning ring 54 are both composed of two half rings. Specifically, in the implementation of the present application, the first positioning ring 34 and the second positioning ring 54 can be divided into two halves, that is, each is composed of two half rings, so that the first positioning ring 34 and the second positioning ring 54 are more convenient to install and remove.
[0027] Reference Figure 1 , the ends of the two sleeves 2 near the bend of the U-shaped tube 1 are connected in the radial direction by a connecting pipe 7. Specifically, in the embodiment of the present application, the ends of the two sleeves 2 near the bend of the U-shaped tube 1 are connected in the radial direction by setting the connecting pipe 7, so that the heat exchange medium flows out of one sleeve 2 and enters the other sleeve 2.
[0028] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.
[0029] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.
Claims
1. A small-tube U-tube heat exchanger, characterized in that: It comprises a U-shaped tube (1), two sleeves (2) arranged outside the straight tube body of the U-shaped tube (1), and a first sealing component (3) and a second sealing component (4) arranged at both ends of each of the sleeves (2); The ends of the two sleeves (2) away from the bending part of the U-shaped tube (1) are radially opened with through openings (21) outward, and the ends of the two sleeves (2) close to the bending part of the U-shaped tube (1) are connected in the radial direction; The first sealing assembly (3) comprises a first sealing tube (31), a first flange (32), a second flange (33), a first positioning ring (34) and a first sealing ring (35); One end of the first sealing tube (31) is integrally connected to one end of the U-shaped tube (1); the first flange (32) is sleeved on the outside of the first sealing tube (31) and integrally connected to the end of the sleeve (2); the first positioning ring (34) is clamped between the inner side of the first flange (32) and the outer side of the first sealing tube (31); The second flange (33) is sleeved on the outer side of the first sealing tube (31), and the first sealing ring (35) is arranged between the first flange (32) and the second flange (33), and the first flange (32) and the second flange (33) are detachably connected; The second sealing assembly (4) comprises a second sealing tube (41), a third flange (42), a fourth flange (43) and a second sealing ring (44); The second sealing tube (41) is sleeved on the outside of the tube body of the U-shaped tube (1) and is integrally connected to the outside of the U-shaped tube (1); The end of the sleeve (2) close to the bending part of the U-shaped tube (1) abuts against the end of the second sealing tube (41) and is integrally connected with the third flange (42), and the inner side of the third flange (42) is sleeved on the outer side of the second sealing tube (41); The fourth flange (43) is sleeved on the outer side of the second sealing tube (41), and the second sealing ring (44) is arranged between the fourth flange (43) and the third flange (42), and the third flange (42) and the fourth flange (43) are detachably connected.
2. The small-tube U-tube heat exchanger according to claim 1 is characterized in that: The invention also comprises a third sealing assembly (5), wherein the third sealing assembly (5) comprises a third sealing tube (51), a fifth flange (52), a sixth flange (53), a second positioning ring (54) and a third sealing ring (55); The outer side of the third sealing tube (51) is sleeved with the fifth flange (52) and can be clamped with the fifth flange (52) in the axial direction; The sixth flange (53) and the second positioning ring (54) are both sleeved on the outside of the first sealing tube (31), and the sixth flange (53) and the second positioning ring (54) can be snap-fitted in the axial direction; The third sealing ring (55) is arranged between the first sealing tube (31) and the third sealing tube (51).
3. The small-tube U-tube heat exchanger according to claim 1, characterized in that: A shock-absorbing block (6) is provided between the outer side of the U-shaped tube (1) and the inner side of the sleeve (2).
4. The small-tube U-tube heat exchanger according to claim 1, characterized in that: The second sealing ring (44) comprises a flexible graphite packing (441) and a metal gasket (442); The flexible graphite packing (441) and the metal gasket (442) are abutted together and are located between the third flange (42) and the fourth flange (43).
5. The small-tube U-tube heat exchanger according to claim 2, characterized in that: The first positioning ring (34) and the second positioning ring (54) have the same structure, and the first positioning ring (34) and the second positioning ring (54) are both composed of two half rings.
6. The small-tube U-tube heat exchanger according to claim 1, characterized in that: A connecting pipe (7) is connected in the radial direction between the ends of the two sleeves (2) close to the bending part of the U-shaped tube (1).