Heat exchanger
By incorporating a tube box and staggered overlapping pipe structure in the heat exchanger, efficient and safe heat exchange is achieved, solving the problem of easy tearing in heat transfer oil heat pipe exchangers and improving the system's safety and heat exchange effect.
Patent Information
- Application Number
- CN202422858239.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-21
AI Technical Summary
Existing thermal oil heat pipe exchangers are prone to tearing during high-temperature and low-temperature heat exchange, resulting in low system safety and poor heat exchange effect.
Design a heat exchanger by setting tube boxes at both ends of the shell, and setting a first cavity and a second cavity inside the tube boxes. The liquid inlet and outlet of the pipe are located on the tube boxes, and the pipes are staggered and overlapping. Uniform heat exchange is achieved by using the medium inside the shell. The pipes can expand freely to reduce thermal stress and avoid tearing, and pressure increase is prevented by an independent fluid loop.
It improves heat exchange efficiency and safety, reduces the probability of safety accidents, and facilitates leak detection and repair.
Smart Images
Figure CN223484907U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a heat exchange device, and more particularly to a heat exchanger. Background Technology
[0002] A heat exchanger is a device that transfers part of the heat from a hot fluid to a cold fluid. Heat exchangers are common equipment in many industrial sectors, including chemical, petroleum, power, food, and others, and play an important role in production. In the copper-clad laminate industry, press hot oil systems are used to cool the presses. Because room-temperature water and high-temperature hot oil directly exchange heat in the hot oil system, the temperature difference at the heat exchange interface is large. Therefore, existing heat pipe heat exchangers are prone to internal tearing, resulting in low system safety. Utility Model Content
[0003] The purpose of this invention is to provide a heat exchanger with good heat exchange effect and high safety.
[0004] To achieve the above objectives, the heat exchanger provided by this utility model includes a shell, tube boxes symmetrically arranged at both ends of the shell, and pipes symmetrically placed inside the shell and connected to the tube boxes at each end; each tube box is provided with a first cavity and a second cavity, the first cavity having an inlet communicating with the inside and outside, and the second cavity having an outlet communicating with its inside and outside; the liquid inlet of the pipe is connected to the first cavity at that end, and the liquid outlet of the pipe is connected to the second cavity at that end; the pipes and the pipes at the opposite end are staggered and overlapped, and there is a certain distance between them.
[0005] Compared with existing technologies, this invention, by setting tube boxes at both ends of the shell and constructing a first cavity, a second cavity, an inlet, and an outlet within each tube box, connects pipes to the tube boxes, and positions the pipes within the shell. This creates two independent fluid loops at both ends of the shell. Furthermore, the staggered overlapping arrangement of the pipes at both ends allows for uniform and thorough heat exchange of the fluids within the pipes using the medium within the shell. Therefore, the heat exchanger of this design exhibits excellent heat exchange performance. In addition, since the inlet and outlet of the pipes are both located on the tube boxes, and there are no other interfaces or welds on the pipes, the connection structure is clearly defined, facilitating rapid leak detection. Furthermore, the heated pipes are freely arranged within the casing and can expand freely after being heated, which can reduce the occurrence of thermal stress and prevent the components from tearing due to thermal stress. By using one end of the pipe to exchange heat with the medium inside the casing, and then using the medium inside the casing to exchange heat with the fluid in the pipe at the other end, the two pipes are separated by the medium in the casing, which can prevent fluid from flowing into the other pipe and causing a sharp increase in pressure if one of the two pipes ruptures. Therefore, the occurrence of safety accidents is greatly reduced and the safety of use is improved.
[0006] Preferably, the tube box includes a partition, which is built into the tube box to divide the interior of the tube box into a first cavity and a second cavity.
[0007] Specifically, the pipe box further includes a tube sheet and a shell. The tube sheet is fixedly connected to the end of the shell. The shell is disposed on the tube sheet. The tube sheet has a first through hole on one side of the first cavity that connects to the liquid inlet, and a second through hole on the side of the tube sheet on the second cavity that connects to the liquid outlet. By using the tube sheet, both ends of the shell can be sealed, and it can also serve as a connecting support plate for the pipe. This ensures that the weld joints between the pipe and the first and second cavities are all located on the tube sheet, which is beneficial for leak detection and maintenance.
[0008] Preferably, the number of pipes connected to the same pipe box is multiple, and the pipes at one end are arranged at intervals with the pipes at the opposite end. This can improve the heat exchange effect and achieve high heat exchange efficiency.
[0009] Preferably, the cross-section of the shell is circular.
[0010] Specifically, the number of pipes located on the same layer gradually decreases from the middle of the shell towards the inner wall of the shell. This design can make full use of the space inside the shell and improve heat exchange efficiency.
[0011] Preferably, the pipe has a U-shaped structure. By designing the pipe into a U-shaped structure, it is beneficial to connect the inlet and outlet of the pipe to the pipe box at the same end, while the other end can freely extend into the shell to eliminate the influence of thermal stress. On the other hand, it can make the internal structure of the shell more compact and reasonable, and make the heat exchanger smaller in size.
[0012] Preferably, the outer side of one end of the housing has a medium inlet connecting its interior and exterior, and the outer side of the other end has a medium outlet connecting its interior and exterior. By providing the medium inlet, it is convenient to inject the medium into the housing while also allowing the housing to communicate with the outside, maintaining a low internal pressure, which helps reduce the internal pressure of the heat exchanger and improves safety. The medium outlet facilitates the discharge of the medium, improving maintenance convenience.
[0013] Preferably, a support plate is provided inside the housing, through which the pipe passes and is supported. By using the support plate to support the pipe, the forces on both ends of the pipe can be balanced, preventing the pipe from cracking and leaking due to stress at the connection point between the pipe and the casing caused by the pipe being suspended inside the housing, thus extending the service life of the heat exchanger. Attached Figure Description
[0014] Figure 1 This is a structural diagram of the heat exchanger of this utility model connecting various systems.
[0015] Figure 2 This is a side view of the internal structure of the heat exchanger of this utility model.
[0016] Figure 3 This is a top-view diagram of the internal structure of the heat exchanger of this utility model.
[0017] Figure 4 This is a left-view diagram of the internal structure of the heat exchanger of this utility model.
[0018] Figure 5 This is a fluid circuit diagram of the heat exchanger of this utility model during heat exchange. Detailed Implementation
[0019] To explain in detail the technical content, structural features, and effects achieved by this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.
[0020] like Figures 1 to 4As shown, the heat exchanger 100 of this utility model includes a housing 1, tube boxes 2 symmetrically arranged at both ends of the housing 1, and pipes 3 symmetrically placed inside the housing 1 and connected to the tube boxes 2 at each end; that is, the heat exchanger 100 of this embodiment has two tube boxes 2, and each tube box 2 is provided with multiple pipes 3, forming a bundle of pipes 3. Each tube box 2 is provided with a first cavity 2a and a second cavity 2b. The first cavity 2a is provided with an inlet 2c communicating with the inside and outside, and the second cavity 2b is provided with an outlet 2d communicating with its inside and outside. The inlet 2c and the outlet 2d are respectively located on the side wall of the tube box 2 and are arranged opposite to each other. The liquid inlet of the pipe 3 communicates with the first cavity 2a at that end, and the liquid outlet of the pipe 3 communicates with the second cavity 2b at that end. The pipes 3 and the pipes 3 at the opposite end are staggered and overlapped, and there is a certain distance between them.
[0021] Please see Figure 3 and Figure 4 The pipe box 2 further includes a partition 21, a tube plate 22, and a shell 23. The partition 21 is built into the pipe box 2 to divide the interior of the pipe box 2 into a first cavity 2a and a second cavity 2b of equal volume. The tube plate 22 is fixedly connected to the end of the shell 1. The shell 23 is disposed on the tube plate 22. The tube plate 22 has a first through hole 2e on one side of the first cavity 2a that connects to the liquid inlet, and a second through hole 2f on the side of the second cavity 2b that connects to the liquid outlet. The number of the first through holes 2e and the second through holes 2f is equal and the same as the number of pipes 3. By setting the tube plate 22, both ends of the shell 1 can be sealed, and it can also serve as a connecting support plate for the pipes 3, so that the connection welds between the pipes 3 and the first cavity 2a and the second cavity 2b are all located on the tube plate 22, which is beneficial for checking for leaks and for convenient maintenance.
[0022] Please see again Figures 2 to 4Specifically, multiple pipes 3 are connected to the same pipe box 2, and the pipes 3 at one end are arranged at intervals with the pipes 3 at the opposite end. This improves the heat exchange effect and achieves high heat exchange efficiency. Specifically, the shell 1 has a circular cross-section. The pipes 3 are arranged layer by layer within the shell 1. The number of pipes 3 located in the same layer gradually decreases from the middle of the shell 1 to the inner wall surface of the shell 1. That is, the number of pipes 3 in the same layer closer to the middle of the shell 1 is greater than the number of pipes 3 in the same layer farther from the middle of the shell 1. This design fully utilizes the internal space of the shell 1 and improves heat exchange efficiency. The pipes 3 have a U-shaped structure. In the same layer, the size of the U-shaped structure of each pipe 3 is different, that is, the opening width of the U-shaped structure is different. The pipe 3 with the largest opening width is located on the outside, and the pipe 3 with the smaller opening width is located on the inside, thereby avoiding mutual interference between the pipes 3. By designing the pipe 3 as a U-shaped structure, on the one hand, it is beneficial for the inlet and outlet of the pipe 3 to be connected to the pipe box 2 at the same end, while the other end can freely extend into the shell 1 to eliminate the influence of thermal stress. On the other hand, it can make the structure inside the shell 1 more compact and reasonable, and make the heat exchanger 100 smaller in size.
[0023] Please see again Figure 1 and Figure 2 The outer side of one end of the housing 1 is provided with a medium inlet 11 connecting its interior and exterior, and the outer side of the other end is provided with a medium outlet 12 connecting its interior and exterior. Both the medium inlet 11 and the medium outlet 12 are equipped with switches. By providing the medium inlet 11, the medium input system 200 can easily inject the medium into the housing 1, and the housing 1 can also communicate with the outside, maintaining a low internal pressure, which helps reduce the internal pressure of the heat exchanger 100 and improves safety. The medium outlet 12 facilitates the discharge of the medium, improving maintenance convenience. The housing 1 has multiple support plates 13 arranged along the central axis of the housing 1. Each support plate 13 has an opening, allowing the spaces between adjacent support plates 13 to communicate with each other, thus allowing the medium to flow within each space. The pipe 3 passes through and is supported by the support plates 13. By using the support plate 13 to support the pipe 3, the forces on both ends of the pipe 3 can be balanced, preventing the pipe 3 from cracking and leaking due to stress at the connection point between the pipe 3 and the pipe box 2 caused by the pipe 3 being suspended inside the shell 1, thus extending the service life of the heat exchanger 100. In this embodiment, during heat exchange, the interior of the shell 1 needs to be kept in communication with the outside to maintain normal pressure inside the shell 1, thereby preventing the medium inside the shell 1 from entering the pipe 3 and mixing with other liquids inside the pipe 3 in the event of a rupture.
[0024] In summary and in combination Figure 1 and Figure 5 The heat exchange principle of the heat exchanger 100 of this utility model will be described in detail below:
[0025] During heat exchange, the circuit of the hot oil system 300 is connected to the inlet 2c and outlet 2d of the pipe 3 at one end of the housing 1, and the circuit of the cooling system is connected to the inlet 2c and outlet 2d of the pipe 3 at the other end of the housing 1. Hot oil enters the first cavity 2a from the inlet 2c of the pipe box 2 at that end of the housing 1, then passes through the first through hole 2e and enters each of the pipes 3 at that end. After passing through the pipes 3, it enters the second cavity 2b, and then flows back to the hot oil system 300 from the outlet 2d of the second cavity 2b. During this process, as the hot oil passes through the pipes 3, heat is transferred to the medium inside the housing 1, causing the hot oil temperature to decrease and the medium temperature to increase. Meanwhile, at the other end of the housing 1, the coolant of the cooling system 400 circuit enters the first cavity 2a from the inlet 2c of the pipe box 2 at that end of the housing 1, then enters each of the pipes 3 at that end through the first through hole 2e, and then enters the second cavity 2b through the pipes 3, before flowing back to the cooling system 400 from the outlet 2d of the second cavity 2b. During this process, the heat of the medium in the housing 1 is transferred to the coolant in the pipes 3, causing the medium temperature to decrease and the coolant temperature to increase. Through the continuous circulation of the above circuit, the heat of the hot oil in the hot oil system 300 can be continuously exchanged with the coolant in the cooling system 400, thereby continuously cooling the hot oil system 300.
[0026] Compared with the prior art, this invention, by setting tube boxes 2 at both ends of the housing 1, and setting a first cavity 2a, a second cavity 2b, an inlet 2c, and an outlet 2d within the tube boxes 2, connects pipes 3 to the tube boxes 2, and positions the pipes 3 within the housing 1, thus forming two independent fluid circuits at both ends of the housing 1. Furthermore, the staggered overlapping arrangement of the pipes 3 at both ends allows for uniform and sufficient heat exchange of the fluids within the pipes 3 using the medium within the housing 1. Therefore, the heat exchanger 100 of this design has excellent heat exchange performance. In addition, since the inlet and outlet of the pipes 3 are both located on the tube boxes 2, and there are no other interfaces or welds on the pipes 3, the connection structure is clear, facilitating rapid leak detection. Furthermore, the heated pipe 3 is freely disposed within the shell 1 and can expand freely after being heated, which can reduce the occurrence of thermal stress and prevent the various components from tearing due to thermal stress. By using the medium inside the shell 1 to exchange heat with the medium inside the shell 1 at one end of the pipe 3, and then using the medium inside the shell 1 to exchange heat with the fluid inside the pipe 3 at the other end, the two pipes 3 are separated by the medium in the shell 1, which can prevent the fluid from flowing into the other pipe 3 after one of the two pipes 3 ruptures and causing a sharp increase in the pressure of the other pipe. Therefore, the occurrence of safety accidents is greatly reduced and the safety of use is improved.
[0027] The structures of the medium input system 200, hot oil system 300 and cooling system 400 involved in the heat exchanger 100 of this utility model are well known to those skilled in the art, and will not be described in detail here.
[0028] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.
Claims
1. A heat exchanger, characterized in that: The device includes a housing, tubing boxes symmetrically arranged at both ends of the housing, and pipes symmetrically placed inside the housing and connected to the tubing boxes at each end; each tubing box has a first cavity and a second cavity, the first cavity having an inlet communicating with the inside and outside, and the second cavity having an outlet communicating with its inside and outside; the inlet of the pipe is connected to the first cavity at that end, and the outlet of the pipe is connected to the second cavity at that end; the pipes at one end and the pipes at the opposite end are staggered and overlapped, and there is a certain distance between them.
2. The heat exchanger as described in claim 1, characterized in that: The pipe box includes a partition, which is built into the pipe box to divide the interior of the pipe box into a first cavity and a second cavity.
3. The heat exchanger as described in claim 2, characterized in that: The tube box also includes a tube sheet and a shell. The tube sheet is fixedly connected to the end of the shell. The shell is disposed on the tube sheet. The tube sheet has a first through hole on one side of the first cavity that connects with the liquid inlet. The tube sheet has a second through hole on one side of the second cavity that connects with the liquid outlet.
4. The heat exchanger as described in claim 1, characterized in that: The number of pipes connected to the same pipe box is multiple, and the pipes at one end are arranged at intervals with the pipes at the opposite end.
5. The heat exchanger as described in claim 1, characterized in that: The shell has a circular cross-section.
6. The heat exchanger as described in claim 5, characterized in that: The number of pipes located on the same layer gradually decreases from the middle of the housing to the inner wall of the housing.
7. The heat exchanger as claimed in claim 1, characterized in that: The pipeline has a U-shaped structure.
8. The heat exchanger as claimed in claim 1, characterized in that: The outer side of one end of the housing is provided with a medium inlet that connects the inside and outside of the housing, and the outer side of the other end is provided with a medium outlet that connects the inside and outside of the housing.
9. The heat exchanger as claimed in claim 1, characterized in that: The housing has an internal support plate, through which the pipe passes and is supported.