Elbow box structure of heat exchanger and heat exchanger
By designing a detachable shell flange and elbow flange connection elbow box structure, the maintenance difficulty and medium turbulence problem of hairpin heat exchangers are solved, and low-cost, low-vibration normal operation is achieved.
Patent Information
- Application Number
- CN202520143852.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-21
AI Technical Summary
The existing hairpin heat exchanger has a welded connection between the bend and the shell, making it impossible to repair. Furthermore, the large-diameter tube box has poor compatibility with the shell structure, resulting in medium turbulence and equipment vibration, which affects normal operation.
Design an elbow box structure including a shell flange, an elbow flange, and an elbow body. The elbow body is detachably connected by fasteners. The elbow body is arranged along the length of the bend section to reduce the internal cavity volume and reduce turbulence. The tube bundle can be disassembled and replaced to reduce maintenance difficulty.
This enables the heat exchanger to be disassembled and maintained, reducing material waste, minimizing equipment vibration, ensuring normal operation, and lowering costs.
Smart Images
Figure CN223769351U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of hairpin heat exchangers, specifically relating to an elbow box structure and a heat exchanger. Background Technology
[0002] Hairpin heat exchangers are generally suitable for small to medium flow pure counter-current or pure parallel flow heat exchange applications. The bend structure of the hairpin heat exchanger is welded to the shell, making it impossible to perform maintenance or tube bundle replacement later. To solve this problem, some heat exchangers use a conventional large-diameter heat exchanger tube box as the bend structure connected to the heat exchanger shell. However, the matching degree between this large-diameter tube box structure and the heat exchanger shell structure is poor, which can easily cause turbulence of the medium and affect the normal operation of the hairpin heat exchanger. Utility Model Content
[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.
[0004] Therefore, the first aspect of this utility model provides a heat exchanger elbow box structure.
[0005] The second aspect of this utility model provides a heat exchanger.
[0006] In view of this, a heat exchanger elbow box structure is provided according to a first aspect of the embodiments of this application, comprising:
[0007] A housing flange, wherein the housing flange is disposed on the housing body;
[0008] Elbow flange, which is connected to the housing flange by fasteners;
[0009] The elbow body is a hollow cavity with an opening at one end. The elbow body extends along the length of the bend section and covers the outside of the bend section. The elbow body is connected to the elbow flange.
[0010] In one feasible implementation, the elbow body is semi-ellipsoidal, and the hollow cavity is semi-ellipsoidal.
[0011] In one feasible implementation, the elbow flange is disposed on the outer wall of the elbow body along the circumference of the elbow body, and the elbow flange is elliptical.
[0012] In one feasible implementation, the housing flange is disposed on the outer wall of the housing body along the circumference of the housing body, and the housing flange is elliptical in shape.
[0013] In one feasible implementation, the elbow body is formed by splicing together two mirror-symmetrically arranged first end caps.
[0014] In one feasible implementation, the two first heads are formed by cutting a standard elliptical head in half;
[0015] The cutting surface of the standard elliptical head is the plane containing the minor axis of the standard elliptical head.
[0016] In one feasible implementation, the cut surface is fitted with the end face of the elbow flange, and the elbow body is welded to the elbow flange through the cut surface.
[0017] In one feasible implementation, the two first heads are welded together.
[0018] In one feasible implementation, the fastener includes:
[0019] Bolts, which pass through the housing flange and the elbow flange;
[0020] A first gasket is fitted over the outside of the bolt, and a first side of the first gasket is in contact with the end face of the housing flange.
[0021] The first nut is threadedly connected to the bolt and fits against the second side of the first washer;
[0022] The second gasket is fitted on the outside of the bolt, and the first side of the second gasket is in contact with the end face of the elbow flange;
[0023] The second nut is threadedly connected to the bolt and fits against the second side of the second washer.
[0024] According to a second aspect of the embodiments of this application, a heat exchanger is provided, comprising: an elbow box structure of a heat exchanger as described in any of the above technical solutions.
[0025] The elbow box structure and heat exchanger of this application have the following advantages compared with the prior art:
[0026] The elbow box structure of the heat exchanger provided in this application embodiment includes a shell flange, an elbow flange, and an elbow body. By setting a shell flange on the shell body and an elbow flange on the elbow body, the elbow body can be detachably assembled onto the shell body using fasteners. When replacing the heat exchange tube bundle or during subsequent equipment maintenance, only the elbow body needs to be disassembled to pull the heat exchange tubes out of the shell body, reducing the maintenance difficulty of the heat exchanger. When necessary, the tube bundle can be replaced while retaining the heat exchanger shell, reducing material loss and waste. The elbow body is arranged along the length of the bend section. On the one hand, by matching the size of the elbow body to the bend section, the volume of the internal cavity of the elbow body can be reduced, thereby reducing turbulence caused by the sudden increase in flow space when the medium enters the elbow body from the shell body, thus reducing the vibration of the tube box equipment and helping to reduce the overall vibration of the heat exchanger, ensuring the normal operation of the heat exchanger. On the other hand, the elbow body is arranged along the length of the bend section, resulting in a smaller overall volume, less material usage, and lower cost. Attached Figure Description
[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0028] Figure 1 A schematic structural diagram of the elbow box structure of a heat exchanger according to an embodiment of this application, showing the first angle.
[0029] Figure 2 A schematic structural diagram of the second angle of the elbow box structure of a heat exchanger according to an embodiment of this application;
[0030] Figure 3 This is a schematic structural diagram of the elbow structure of an existing heat exchanger;
[0031] Figure 4 A schematic structural diagram of the elbow body of an elbow box structure of a heat exchanger according to an embodiment of this application, showing the first angle of the elbow body.
[0032] Figure 5 A schematic structural diagram of the second angle of the elbow body of the elbow box structure of a heat exchanger according to an embodiment of this application;
[0033] Figure 6 The diagram illustrates the manufacturing process of the elbow box structure of a heat exchanger according to one embodiment of this application, which uses a standard elliptical head to create the elbow body.
[0034] in, Figures 1 to 6The correspondence between the reference numerals and component names in the attached drawings is as follows:
[0035] 11. Shell flange; 12. Elbow flange; 13. Elbow body; 14. Fasteners; 15. Bevel; 16. Pipe bend section;
[0036] 130. First end cap; 141. Bolt; 142. First nut; 143. Second nut;
[0037] 21. Standard elliptical head; 22. Cut surface. Detailed Implementation
[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0041] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.
[0042] like Figure 1 and Figure 2As shown, according to a first aspect of the embodiments of this application, a heat exchanger elbow box structure is proposed, including: a shell flange 11, an elbow flange 12, and an elbow body 13; the shell flange 11 is disposed on the shell body; the elbow flange 12 is connected to the shell flange 11 by fasteners 14; the elbow body 13 is a hollow cavity with an opening at one end, the elbow body 13 extends along the shape of the bent pipe section 16, the shape of the elbow body 13 is adapted to the bent pipe section 16, the elbow body 13 covers the outside of the bent pipe section 16, and the elbow body 13 is connected to the elbow flange 12.
[0043] The elbow box structure of the heat exchanger provided in this application embodiment includes a shell flange 11, an elbow flange 12, and an elbow body 13. By setting the shell flange 11 on the shell body and the elbow flange 12 on the elbow body 13, the elbow body 13 can be detachably assembled onto the shell body using fasteners 14. When replacing the heat exchange tube bundle or during subsequent equipment maintenance, only the elbow body 13 needs to be disassembled to pull the heat exchange tubes out of the shell body, reducing the maintenance difficulty of the heat exchanger. When necessary, the tube bundle can be replaced while retaining the heat exchanger shell, thus reducing material usage. This reduces waste and loss. The elbow body 13 is arranged along the length of the bend section 16. On the one hand, by matching the size of the elbow body 13 with the bend section 16, the volume of the internal cavity of the elbow body 13 can be reduced, thereby reducing the turbulence caused by the sudden increase in flow space when the medium enters the elbow body 13 from the shell body. This reduces the vibration of the tube box equipment, which is beneficial to reducing the overall vibration of the heat exchanger and ensuring the normal operation of the heat exchanger. On the other hand, the elbow body 13 is arranged along the length of the bend section 16, resulting in a smaller overall volume, less material usage, and lower cost.
[0044] Furthermore, the length of the elbow body 13 is greater than the width of the elbow body 13.
[0045] In some examples, after the elbow body 13 and elbow flange 12 are assembled and welded, corresponding flange sealing surfaces need to be machined on the elbow flange 12 and the shell flange 11 respectively to ensure the sealing performance between the elbow flange 12 and the shell flange 11. After the sealing surface gap between the shell flange 11 and the elbow flange 12 meets the assembly process requirements, fasteners 14 are used for assembly and fixing, and bolts 141 are used to tighten to the designed torque.
[0046] It should be noted that, Figure 3The existing tube box elbow structure is shown, in which the tube box structure is generally circular, and the overall diameter of the tube box structure is much larger than the diameter of the shell. Large cavities exist on both sides of the tube box structure, causing turbulence when the medium enters the tube box structure, resulting in vibration of the tube box structure and the entire heat exchanger. Furthermore, the ineffective area of the heat exchanger is large, leading to significant material waste. This application reduces the volume of the elbow body 13, thereby reducing the wasted space on both sides of the shell body. This not only reduces the vibration of the elbow body 13 but also saves on manufacturing costs, making it highly practical.
[0047] like Figure 2 , Figure 4 and Figure 5 As shown, in one feasible embodiment, the elbow body 13 is semi-ellipsoidal, and the hollow cavity is semi-ellipsoidal.
[0048] In this technical solution, the wall thickness of the elbow body 13 is uniform throughout, and the elbow body 13 is semi-ellipsoidal. The hollow cavity is also semi-ellipsoidal, which not only conforms to the trajectory of the bend section 16 and reduces the internal space of the elbow body 13, but also allows the medium to transition smoothly when entering the elbow body 13, resulting in uniform and stable flow. This helps to reduce turbulence in the elbow body 13 and reduce vibration of the elbow body 13.
[0049] like Figure 2 As shown, in one feasible embodiment, the elbow flange 12 is disposed on the outer wall of the elbow body 13 along the circumference of the elbow body 13, and the elbow flange 12 is elliptical.
[0050] In this technical solution, the elbow flange 12 is arranged on the outer wall of the elbow body 13 along the circumference of the elbow body 13, and the elbow flange 12 is elliptical to ensure the stability of the elbow body 13 and the shell flange 11, and to make the clamping force of the fastener 14 on the elbow body 13 more uniform in the circumferential direction, so as to ensure the structural reliability of the heat exchanger.
[0051] In one feasible implementation, the housing flange 11 is disposed on the outer wall of the housing body along the circumference of the housing body, and the housing flange 11 is elliptical.
[0052] In this technical solution, the shape of the shell flange 11 matches the shape of the elbow flange 12, ensuring the tightness and reliability of the connection between the shell flange 11 and the elbow flange 12 in all circumferential directions, and realizing a stable connection between the elbow body 13 and the shell body.
[0053] like Figure 2 and Figure 5 As shown, in one feasible implementation, the elbow body 13 is formed by splicing two mirror-symmetrically arranged first end caps 130.
[0054] In this technical solution, the elbow body 13 has a symmetrical structure, which is formed by assembling two first end caps 130 with the same structure and then splicing them together. The elbow body 13 is difficult to form directly. The elbow body 13 is formed by splicing two first end caps 130, which reduces the processing and manufacturing difficulty of the elbow body 13.
[0055] like Figure 6 As shown, in one feasible embodiment, the two first heads 130 are formed by cutting a standard elliptical head 21 in half; wherein, the cutting surface 22 of the standard elliptical head is the plane containing the minor axis of the standard elliptical head.
[0056] In this technical solution, the two first heads 130 are produced by cutting a standard elliptical head 21 in half along its own short axis. The elbow body 13 is formed by cutting and splicing the standard elliptical head 21. The materials for making the elbow body 13 are easy to obtain and can be purchased directly. The overall processing is simple, which reduces the manufacturing difficulty and cost of the elbow body 13.
[0057] In one feasible implementation, the cut surface 22 is fitted with the end face of the elbow flange 12, and the elbow body 13 is welded to the elbow flange 12 through the cut surface 22.
[0058] In this technical solution, the standard elliptical end cap 21 includes two curved surfaces, an inner wall and an outer wall, and a straight end face. Two first end caps 130 are spliced together at the original end face position to form the elbow body 13. The cut surface 22 of the first end cap 130 is connected to the elbow flange 12 so that the elbow body 13 can be assembled on the shell flange 11 through the elbow flange 12.
[0059] In some examples, when making the elbow body 13, a line is first drawn at the center of the standard elliptical head, and then cut along the line. The cut standard elliptical head is divided into two identical first heads 130, which are then assembled and welded according to the end faces of the original standard elliptical head to form the elbow body 13.
[0060] Specifically, a plasma arc cutting machine is used to cut the standard elliptical end cap 21, and a bevel 15 is machined on the cut surface 22 to enhance the stability of the elbow body 13 and the elbow flange 12 after welding.
[0061] In one feasible implementation, the two first heads 130 are welded together.
[0062] In this technical solution, the two first end caps 130 are spliced and welded together to ensure the structural strength and sealing of the elbow body 13 and prevent the medium from leaking at the elbow body 13.
[0063] Furthermore, such as Figure 6The welding surfaces of the two first heads 130 are the straight end faces of the original standard elliptical head 21.
[0064] like Figure 1 As shown, in one feasible embodiment, the fastener 14 includes: a bolt 141, a first washer, a first nut 142, a second washer, and a second nut 143; the bolt 141 passes through the housing flange 11 and the elbow flange 12; the first washer is fitted on the outside of the bolt 141, and the first side of the first washer is in contact with the end face of the housing flange 11; the first nut 142 is threaded to the bolt 141, and the first nut 142 is in contact with the second side of the first washer; the second washer is fitted on the outside of the bolt 141, and the first side of the second washer is in contact with the end face of the elbow flange 12; the second nut 143 is threaded to the bolt 141, and the second nut 143 is in contact with the second side of the second washer.
[0065] In this technical solution, the housing flange 11 and the elbow flange 12 are connected by several fasteners 14. Bolts 141 pass through both the housing flange 11 and the elbow flange 12. The housing flange 11 and the elbow flange 12 are pressed and fixed by the cooperation of the first nut 142 and the second nut 143, making the housing flange 11 and the elbow flange 12 detachably connected. By setting a first gasket between the housing flange 11 and the first nut 142 and a second gasket between the elbow flange 12 and the second nut 143, the first nut 142 and the second nut 143 are prevented from loosening, ensuring the firmness and reliability of the connection between the elbow body 13 and the housing body, thereby reducing the possibility of media leakage.
[0066] According to a second aspect of this application, a heat exchanger is proposed, comprising: an elbow box structure of a heat exchanger as described in any of the above technical solutions.
[0067] The heat exchanger provided in this application embodiment includes the elbow box structure of the heat exchanger as described in any of the above technical solutions. Therefore, the heat exchanger has all the beneficial effects of the elbow box structure of the heat exchanger in the above technical solutions, which will not be elaborated here.
[0068] Specifically, the heat exchanger may include a hairpin heat exchanger.
[0069] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.
[0070] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.
Claims
1. A bend box structure of a heat exchanger, characterized by comprising: The elbow box structure of the heat exchanger comprises: a shell flange provided on the shell body; an elbow flange connected with the shell flange through fasteners; an elbow body which is a hollow cavity with an opening at one end, extends along the length direction of the elbow pipe section, covers the outside of the elbow pipe section, and is connected with the elbow flange.
2. The elbow box structure of the heat exchanger according to claim 1, wherein the elbow body is semi-ellipsoidal, and the hollow cavity is semi-ellipsoidal.
3. The elbow box structure of the heat exchanger according to claim 2, wherein the elbow flange is provided on the outer wall of the elbow body along the circumferential direction of the elbow body, and is in the shape of an elliptical ring.
4. The elbow box structure of the heat exchanger according to claim 3, wherein the shell flange is provided on the outer wall of the shell body along the circumferential direction of the shell body, and is in the shape of an ellipse.
5. The elbow box structure of the heat exchanger according to claim 1, wherein the elbow body is spliced by two first heads which are mirror-symmetrically arranged.
6. The elbow box structure of the heat exchanger according to claim 5, wherein the two first heads are obtained by cutting a standard elliptical head in half; wherein the cutting surface of the standard elliptical head is the plane on which the minor axis of the standard elliptical head is located.
7. The elbow box structure of the heat exchanger according to claim 6, wherein the cutting surface is in contact with the end surface of the elbow flange, and the elbow body is welded to the elbow flange through the cutting surface.
8. The elbow box structure of the heat exchanger according to claim 5, wherein the two first heads are welded.
9. The elbow box structure of the heat exchanger according to any one of claims 1-8, wherein the fasteners comprise: a bolt which passes through the shell flange and the elbow flange; a first gasket which is sleeved on the outside of the bolt, and whose first side is in contact with the end surface of the shell flange; a first nut which is threadedly connected with the bolt, and which is in contact with the second side of the first gasket; a second gasket which is sleeved on the outside of the bolt, and whose first side is in contact with the end surface of the elbow flange; a second nut which is threadedly connected with the bolt, and which is in contact with the second side of the second gasket.
10. A heat exchanger, characterized by The elbow box structure of the heat exchanger according to any one of claims 1-9.