Shell-and-tube type new air heat exchange device without welding

Abstract

The utility model belongs to the new trend heat transfer technical field provides a kind of welded tube bundle new trend heat exchange device of shell-and-tube, it includes: shell, the shell one end is provided with exhaust air inlet, the shell inside is fixedly installed with new trend fan near exhaust air inlet side, the shell side is provided with exhaust fan, the new trend fan is used to blow, the exhaust fan is used to exhaust, the shell is provided with exhaust air outlet away from exhaust air inlet one end, the shell inside is provided with tube bundle, the tube bundle is made of metal material;The utility model uses resin potting fixed metal tube bundle to replace traditional welding process, resin potting material is injected into the gap between shell and tube bundle, after resin solidification, it can complete fixation, the whole process is easy to operate, need not complex equipment and professional skill, reduce the requirement to operator, simultaneously, the cost of resin potting material is relatively lower, and the production efficiency of potting process is high.

Description

Technical Field

[0001] This utility model belongs to the field of fresh air heat exchange technology, specifically relating to a shell-and-tube type weld-free tube bundle fresh air heat exchange device. Background Technology

[0002] In today's society, with the improvement of people's living standards and increasingly stringent requirements for indoor air quality, fresh air systems are being used more and more widely in various types of buildings. The main function of a fresh air system is to achieve the exchange of indoor and outdoor air, and at the same time, to exchange heat between the air exhausted outdoors and the air introduced indoors through heat exchange devices, in order to achieve energy saving and maintain a stable indoor temperature. As one of the core components of a fresh air system, the performance and reliability of the heat exchanger directly affect the overall operation of the fresh air system.

[0003] Traditional fresh air heat exchangers primarily use a two-end welding process to fix the internal tube bundles. While this welding method did provide a relatively stable connection method in the early days, it requires specialized welding equipment and skilled welders, resulting in high equipment purchase and maintenance costs. Furthermore, the welding process consumes significant amounts of energy, such as electricity and gas, increasing production costs. The complexity of the welding process also leads to a relatively high defect rate, resulting in additional cost losses. In terms of reliability, welded areas are susceptible to corrosion from environmental factors, especially in humid environments containing corrosive gases. Once corrosion occurs, the connection between the tube bundle and the shell loosens, causing air leakage. Air leakage not only reduces the heat exchanger's efficiency but also hinders the sufficient exchange of heat between indoor and outdoor air. This leads to large fluctuations in indoor temperature, increases energy consumption of air conditioning and other equipment, and affects indoor air quality. Furthermore, traditional heat exchangers often use plastic shells, which, while lightweight, low-cost, and corrosion-resistant, have a fatal flaw: they cannot withstand the high temperatures generated during welding. During welding, the high temperatures can cause the plastic shell to deform, melt, or even burn, severely affecting its structural integrity and appearance. In addition, traditional heat exchangers cannot be disassembled and cleaned for maintenance. Over time, dust, dirt, and bacteria easily accumulate inside the heat exchanger. These contaminants adhere to the tube surface, reducing heat exchange efficiency and promoting bacterial growth and odors, seriously polluting indoor air quality. In summary, the welding process used in traditional heat exchangers has many problems, including high cost, susceptibility to corrosion and air leakage, and difficulty in disassembly and maintenance, making it unable to meet the performance and reliability requirements of modern fresh air systems. Utility Model Content

[0004] The purpose of this invention is to provide a shell-and-tube type weld-free tube bundle fresh air heat exchange device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A shell-and-tube type weld-free tube bundle fresh air heat exchanger includes:

[0007] The tube shell has an exhaust air inlet at one end, a fresh air fan fixedly installed inside the tube shell near the exhaust air inlet, and an exhaust fan on one side of the tube shell. The fresh air fan is used for blowing air, and the exhaust fan is used for drawing air. An exhaust air outlet is provided at the end of the tube shell away from the exhaust air inlet. A tube bundle is provided inside the tube shell. The tube bundle is made of metal material, and the outer side of the tube bundle is textured. The texture is used to guide fluid to flow from bottom to top along the tube wall. The texture types include multi-head threaded grooves, spiral fins, corrugations, twisted textures, and double fins.

[0008] Preferably, the tube bundle and the tube shell are integrally formed.

[0009] Preferably, the tube bundle is separately connected to the tube shell, the tube bundle is movably installed inside the tube shell, a baffle is provided on the outside of the tube bundle, the tube bundle is integrally encapsulated, a sealing filling layer is provided at both ends of the tube bundle, and the tube bundle is connected to the tube shell through the sealing filling layer.

[0010] Preferably, the material of the sealing filler layer includes epoxy resin, polyurethane, silicone rubber, high-strength structural adhesive, and hot melt plastic.

[0011] Preferably, an outer shell is fixedly installed on the outside of the pipe shell near the fresh air fan. The outer shell wraps around the outside of the pipe shell and is interconnected with the inside of the pipe shell. Several pipe shell air outlets are opened on the side of the pipe shell near the outer shell, and several pipe shell air inlets are opened on the side of the pipe shell away from the pipe shell air outlets.

[0012] Preferably, a T-shaped pipe is fixedly installed on the outside of the pipe shell near the fresh air fan. The T-shaped pipe is interconnected with the inside of the pipe shell. A fresh air outlet is provided at the end of the T-shaped pipe away from the pipe shell, and several fresh air inlets are opened on the side of the pipe shell away from the T-shaped pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) This utility model uses resin potting to fix metal tube bundles instead of traditional welding process. The resin potting material is injected into the gap between the tube shell and the tube bundle. After the resin cures, the fixation is completed. The whole process is easy to operate and does not require complicated equipment and professional skills, which reduces the requirements for operators. At the same time, the cost of resin potting material is relatively low and the production efficiency of the potting process is high, which can realize large-scale automated production and further reduce production costs. The resin potting layer has good sealing performance and can completely fill the gap between the tube shell and the tube bundle to form a uniform and dense sealing layer, which effectively prevents gas leakage. At the same time, the resin material itself has a certain degree of corrosion resistance. Compared with metal materials, resin materials are more stable in humid environments containing corrosive gases and are less prone to chemical reactions. Therefore, using resin potting to fix metal tube bundles can reduce the risk of air leakage due to corrosion. Even if the surface of the tube bundle is slightly corroded during use, the resin potting layer can play a certain protective role, prevent further corrosion, and extend the service life of the equipment.

[0015] (2) This utility model provides two installation methods: a detachable structure and a non-detachable structure. Although the tube bundle cannot be directly disassembled, the dust and dirt inside the tube shell can be effectively cleaned by flushing with water through the four air vents. This cleaning method is simple to operate and does not require professional tools or skills. Users can complete it themselves. The detachable design makes cleaning and maintenance more convenient and quick. The tube bundle is made into a whole by resin potting and fixing process. The internal tube bundle is fixed by spiral baffles. When in use, the tube bundle can be directly inserted into the tube shell. When cleaning is required, the tube bundle can be directly pulled out for cleaning without disassembling the entire heat exchange device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0017] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0018] Figure 3 This is a schematic diagram of the texture structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of Embodiment 4 of this utility model.

[0021] In the diagram: 1. Tube shell; 2. Exhaust air inlet; 3. Fresh air fan; 31. Exhaust fan; 4. Exhaust air outlet; 5. Tube bundle; 6. Texture; 7. Baffle plate; 8. Sealing filler layer; 9. Outer shell; 10. Tube shell outlet; 11. Tube shell inlet; 12. T-joint; 13. Fresh air outlet; 14. Fresh air inlet. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1:

[0024] Please see Figure 1 - Figure 2 As shown, a shell-and-tube type weld-free tube bundle fresh air heat exchanger includes:

[0025] The tube shell 1 has an exhaust air inlet 2 at one end. A fresh air fan 3 is fixedly installed inside the tube shell 1 near the exhaust air inlet 2. An exhaust fan 31 is installed on one side of the tube shell 1. The fresh air fan 3 is used for blowing air, and the exhaust fan 31 is used for drawing air. An exhaust air outlet 4 is provided at the end of the tube shell 1 away from the exhaust air inlet 2. The tube bundle 5 is made of metal material inside the tube shell 1. The outer side of the tube bundle 5 is provided with textures 6. The textures 6 are used to guide the fluid to flow from bottom to top along the tube wall. The types of textures 6 include multi-head threaded grooves, spiral fins, corrugations, twisted textures, and double fins.

[0026] Specifically, the tube bundle 5 and the tube shell 1 are integrally formed.

[0027] As can be seen from the above, the shell 1 is made of PVC material, including composite materials. In addition to using ready-made pipes, the shell 1 can also use square and oval pipes, or can be prefabricated into various shapes by rolling or folding thin metal sheets and other composite plates to adapt to various application scenarios. The specifications of the shell 1 are common water supply and drainage pipe fittings of 25-350. The outer wall of the tube bundle 5 is provided with textures 6. Textures 6 are used to improve heat exchange efficiency. The types of textures 6 include but are not limited to multi-head threaded grooves, spiral fins, corrugations, twisted textures, and double fins (fins are provided inside and outside). They guide the fluid to flow from bottom to top along the perimeter of the tube wall, increase the turbulence of the fluid, break the fluid boundary layer, and improve the heat exchange system. The tube bundle 5 and the shell 1 are integrally injection molded, and the non-removable structure has good integrity and sealing, effectively preventing gas leakage and improving the airtightness of the heat exchange device. The four air inlets are flushed with water, which is simple and convenient to operate. Users can complete the cleaning themselves, reducing the difficulty and cost of cleaning and maintenance. In this embodiment, an anti-freeze design can be added to adapt to the northern market. A composite PU foam layer (10mm thick, thermal conductivity 0.025W / m·K) is added to the outer wall of the shell 1, and a PTC heater (50W power) is added to the air inlet. Even in an environment of -20℃, the anti-frost rate is significantly improved.

[0028] Example 2:

[0029] Please see Figure 2 - Figure 3 As shown, the tube bundle 5 is separately connected to the tube shell 1. The tube bundle 5 is movably installed inside the tube shell 1. A baffle 7 is provided on the outside of the tube bundle 5. The tube bundle 5 is integrally encapsulated. Both ends of the tube bundle 5 are provided with sealing filling layers 8. The tube bundle 5 is connected to the tube shell 1 through the sealing filling layers 8.

[0030] Specifically, the materials of the sealing filler layer 8 include epoxy resin, polyurethane, silicone rubber, high-strength structural adhesive, and hot melt plastic.

[0031] As can be seen from the above, in this embodiment, the tube bundle 5 is individually encapsulated as a whole using a resin encapsulation and fixing process, and then directly inserted into the tube shell 1 for use. When cleaning is required, the tube bundle 5 can be simply pulled out for cleaning. In addition, in this embodiment, the tube bundle 5 can be fixed as a whole by means of baffles 7, and then encapsulated and fixed with resin encapsulation material to make it an independent whole. The baffles 7 can be arc-shaped or spiral-shaped. Different baffle shapes 7 can be selected according to actual needs to better guide fluid flow. The arc-shaped baffles 7 can make the fluid form a more complex flow path between the tube bundles 5, increasing the contact opportunity between the fluid and the tube bundles 5. The spiral-shaped baffles 7 can make the fluid generate rotational motion, enhance the mixing effect of the fluid, and further improve the heat exchange efficiency. By optimizing the design of the baffles 7, the fluid can obtain more sufficient heat exchange in the heat exchanger, improving the performance of the entire heat exchange device.

[0032] Example 3:

[0033] Please see Figure 4 As shown, a housing 9 is fixedly installed on the outside of the pipe shell 1 near the fresh air fan 3. The housing 9 wraps around the outside of the pipe shell 1 and is interconnected with the inside of the pipe shell 1. Several pipe shell air outlets 10 are opened on the side of the pipe shell 1 near the housing 9, and several pipe shell air inlets 11 are opened on the side of the pipe shell 1 away from the pipe shell air outlets 10.

[0034] As can be seen from the above, in this embodiment, an outer shell 9 is provided outside the shell 1, and an exhaust fan 31 is provided inside the outer shell 9 to form a dual-fan structure. The two fans are arranged vertically. After the fresh air enters the shell 1 through the air inlet 11, it flows under the guidance of the baffle 7. The fresh air fan 3 accelerates the fresh air and guides it to fully contact the tube bundle 5. The texture 6 (such as multi-threaded groove) on the outer wall of the tube bundle 5 enhances the heat exchange effect. The fresh air and exhaust air complete the heat exchange in the process of counter-current flow. The heat-exchanged fresh air is discharged from the air outlet 10 of the shell. In this embodiment, the air inlet 11 of the shell can be replaced by a three-way mechanism. Either one can be selected, or both can exist at the same time.

[0035] Example 4:

[0036] Please see Figure 5 As shown, a three-way pipe 12 is fixedly installed on the outside of the casing 1 near the fresh air fan 3. The three-way pipe 12 is interconnected with the inside of the casing 1. A fresh air outlet 13 is provided at the end of the three-way pipe 1 away from the casing 1. Several fresh air inlets 14 are opened on the side of the casing 1 away from the three-way pipe 12.

[0037] As can be seen from the above, in this embodiment, the tee pipe 12 can be either an oblique tee or a straight tee. A housing 9 is provided on the outside of the tee pipe 12. Fresh air enters the housing 1 through the fresh air inlet 14. Under the combined action of the tee pipe 12 and the baffle 7, a relatively complex reverse airflow channel is formed. The texture 6 on the outer wall of the tube bundle 5 can guide the fluid to generate swirling flow, increasing the friction and heat exchange area between the fluid and the tube wall. During the reverse flow process, the fresh air and exhaust air exchange heat through the tube bundle 5, achieving temperature regulation of the fresh air. In this embodiment, the fresh air inlet 14 can be replaced with a tee mechanism. Either one can be chosen, or both can coexist.

[0038] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0039] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A shell-and-tube type weld-free tube bundle fresh air heat exchanger, characterized in that, Comprising: A shell (1), at one end of the shell (1) there is an exhaust air inlet (2), inside the shell (1) near the exhaust air inlet (2) side, a fresh air fan (3) is fixedly installed, on one side of the shell (1) there is an exhaust fan (31), the fresh air fan (3) is used for blowing air, the exhaust fan (31) is used for exhausting air, at the end of the shell (1) far from the exhaust air inlet (2) there is an exhaust air outlet (4), inside the shell (1) there is a tube bundle (5), the tube bundle (5) is made of metal material, on the outer side of the tube bundle (5) there are patterns (6), the patterns (6) are used to guide the fluid to flow upward from bottom to top along the periphery of the tube wall, the types of the patterns (6) include multi-headed thread grooves, spiral fins, corrugations, twisted threads, double fins.

2. The shell-and-tube type weld-free tube bundle fresh air heat exchanger according to claim 1, characterized in that, The tube bundle (5) and the shell (1) are integrally formed.

3. The shell-and-tube type weld-free tube bundle fresh air heat exchanger according to claim 1, characterized in that, The tube bundle (5) and the shell (1) are detachably connected, the tube bundle (5) is movably installed inside the shell (1), on the outer side of the tube bundle (5) there is a baffle plate (7), the tube bundle (5) is integrally encapsulated and formed, both ends of the tube bundle (5) are provided with a sealing filling layer (8), and the tube bundle (5) is connected to the shell (1) through the sealing filling layer (8).

4. A shell-and-tube type weld-free tube bundle fresh air heat exchanger according to claim 3, characterized in that, The material of the sealing filling layer (8) includes epoxy resin, polyurethane, silicone rubber, high-strength structural adhesive, hot-melt plastic.

5. A shell-and-tube type weld-free tube bundle fresh air heat exchanger according to claim 1, characterized in that, Outside the shell (1) near the fresh air fan (3) end, a housing (9) is fixedly installed, the housing (9) wraps around the outside of the shell (1), the housing (9) and the inside of the shell (1) are互通设置 (it should be 'interconnected' here), on the side of the shell (1) near the housing (9) there are several shell air outlets (10), at the end of the shell (1) far from the shell air outlets (10) there are several shell air inlets (11).

6. A shell-and-tube type weld-free tube bundle fresh air heat exchanger according to claim 1, characterized in that, Outside the shell (1) near the fresh air fan (3) side, a three-way pipe (12) is fixedly installed, the three-way pipe (12) and the inside of the shell (1) are interconnected, at the end of the three-way pipe (12) far from the shell (1) there is a fresh air outlet (13), on the side of the shell (1) far from the three-way pipe (12) there are several fresh air inlets (14).

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