A low resistance and high efficiency heat exchanger

Abstract

The utility model relates to the technical field of heat exchange equipment, and specifically to a low-resistance and high-efficiency heat exchanger, comprising an outer sleeve, which is a tubular structure with openings at both ends. A heat exchange tube is inserted into the outer sleeve, and the heat exchange tube is a columnar structure, which is composed of a plurality of branch tubes of different diameters uniformly arranged circumferentially. There is a closed gap between the branch tubes in the heat exchange tube, which is an inner cavity. Both end surfaces of the heat exchange tube are also provided with a concave spherical surface that is recessed toward the center of the heat exchange tube, which solves the problem that the flow rate of the fluid in the center of the tube body is higher than that of the surrounding due to the wall friction in the device in the prior art, thereby resulting in a large flow rate and a fast rate of the central fluid, while the flow rate and the flow rate of the surrounding fluid entering the heat exchange tube are small and slow, thereby resulting in uneven local heat exchange and the problem of fluid retention, and also resulting in uneven fluid distribution and slow overall rate.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a low-resistance and high-efficiency heat exchanger. Background Art

[0002] A heat exchanger, also known as a heat exchanger or heat exchange equipment, is a device used to transfer heat from a hot fluid to a cold fluid to meet specific process requirements. It is an industrial application of convective heat transfer and heat conduction. Heat exchangers are widely used in many fields, including but not limited to electricity, chemical industry, food manufacturing, air conditioning and refrigerators.

[0003] The working principle of heat exchangers is mainly based on heat conduction and convection. In a heat exchanger, hot fluid and cold fluid flow through different channels, and the two flow crosswise inside the device. When the hot fluid passes through the heat transfer surface of the heat exchanger, its heat is transferred to the cold fluid by conduction. In addition, due to the temperature difference between the fluids, convection will also occur, further increasing the heat transfer efficiency.

[0004] There are many types of heat exchangers. According to the operation process, they are divided into partition type, hybrid type, heat storage type (or heat recovery type); according to the surface compactness, they are divided into compact type and non-compact type; according to the structure, they are divided into tubular type (coil type, shell and tube type, shell and tube type, etc.), plate type (plate heat exchanger, spiral plate heat exchanger, plate-fin heat exchanger, etc.) and other types (scraped surface heat exchanger, rotary disc heat exchanger and air cooler, etc.).

[0005] Among them, the tubular heat exchanger is an important type of heat exchanger. Its structural principle is mainly composed of a shell, a heat transfer tube bundle, a tube sheet, a baffle (baffle) and a tube box. The shell is usually cylindrical, with a tube bundle inside, and both ends of the tube bundle are fixed on the tube sheet. During the heat exchange process, one fluid flows inside the tube, called the tube-side fluid; the other flows outside the tube, called the shell-side fluid. In order to improve the heat transfer efficiency, baffles are usually installed in the shell to increase the velocity and turbulence of the shell-side fluid.

[0006] Although tubular heat exchangers may not be as good as some other types of heat exchangers (such as plate and plate-fin heat exchangers) in terms of compactness and heat transfer efficiency, they still occupy an important position in the application of chemical, petroleum and energy industries due to their above-mentioned advantages.

[0007] A tubular radiator with announcement number CN215725330U includes a cylinder, a feed port, a discharge port, a water inlet, a water outlet and a plurality of heat exchange tubes. A first head and a second head are respectively provided at both ends of the cylinder. The feed port is provided on the first head, the discharge port is provided on the second head, the water inlet is provided on one side of the top of the cylinder, and the water outlet is provided on one side of the bottom of the cylinder. A first tube sheet is provided near the first head of the cylinder, and a second tube sheet is provided near the second head of the cylinder. Multiple connecting holes are provided on the first tube sheet and the second tube sheet, and a corresponding group of connecting holes are connected to the outer circumference of both ends of the heat exchange tube. One end of the heat exchange tube is connected to the feed port, and the other end of the heat exchange tube is connected to the discharge port. The utility model has a simple structure. Cooling water enters the cylinder from the water inlet and wraps around the heat exchange tube, which greatly increases the heat exchange area and the heat exchange rate. At the same time, the material enters the heat exchange tube for cooling and is sent out, and the cooling water can be heated up for use to circulate heat energy. The technical structure uses a heat exchange tube as a heat exchange structure. The heat exchange tube is composed of a number of heat-conducting tubes with the same diameter. However, in actual use, due to the wall friction, the fluid flow rate in the center of the tube body is higher than that in the surroundings, resulting in a large flow rate and a fast rate of the central fluid, while the flow rate and velocity of the surrounding fluid entering the heat exchange tube are small and slow, which leads to uneven local heat exchange and fluid retention. This phenomenon can also lead to uneven fluid distribution and slow overall rate. Utility Model Content

[0008] The utility model provides a low-resistance and high-efficiency heat exchanger, which solves the problem in the prior art that due to the wall friction, the fluid flow rate in the center of the tube body is higher than that in the surroundings, thus resulting in a large flow rate and a fast rate of the central fluid, while the flow rate and the velocity of the surrounding fluid entering the heat exchange tube are small, resulting in uneven local heat exchange and fluid retention, and also causing uneven fluid distribution and slow overall rate.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A low-resistance and high-efficiency heat exchanger comprises an outer sleeve, which is a tubular structure with two ends open. A heat exchange tube is inserted into the outer sleeve. The heat exchange tube is a columnar structure and is composed of a plurality of branch tubes of different diameters arranged evenly around the circumference. There is a closed gap between the branch tubes in the heat exchange tube, which is an inner cavity. The two end surfaces of the heat exchange tube are also provided with concave spherical surfaces that are concave toward the center of the heat exchange tube.

[0011] Preferably, the two ends of the outer sleeve are respectively connected to the front cover and the rear cover, and a medium inlet is provided at one end of the outer circumference of the outer sleeve close to the front cover, and a medium outlet is provided at one end close to the rear cover, and the heat exchange tube is accommodated and fixed in the outer sleeve.

[0012] Preferably, the heat exchange tube is a columnar structure, the branch tube includes a small diameter tube, a medium diameter tube and a large diameter tube, and the heat exchange tube is composed of a plurality of small diameter tubes, medium diameter tubes and large diameter tubes arranged circumferentially, the small diameter tubes, medium diameter tubes and large diameter tubes are closed at both ends, and a closed gap is formed between adjacent branch tubes, which is an inner cavity.

[0013] Preferably, a fixed column mouth penetrating the heat exchange tube is provided on the axis of the heat exchange tube, a plurality of small-diameter tubes are equidistantly distributed on the end surface of the heat exchange tube near the fixed column mouth, a plurality of large-diameter tubes are equidistantly distributed on the end surface of the heat exchange tube near the edge, and a plurality of medium-diameter tubes are equidistantly distributed on the end surface between the small-diameter tube and the large-diameter tube.

[0014] Preferably, a fixed column is sealably penetrated at the fixed column mouth, the fixed column is connected to the heat exchange tube as a whole, a spiral guide vane is integrally provided on the outer periphery of the fixed column, the guide vane is located in the inner cavity, and the branch pipe seal passes through the guide vane.

[0015] Preferably, the rear end cover is hemispherical, and a hemispherical air guide cover is extended outward from the bottom surface, and the spherical surface is farther than the rear end cover, and the spherical surface of the air guide cover matches the concave spherical surface.

[0016] Preferably, the medium inlet and the medium outlet are communicated with the inner cavity.

[0017] Preferably, the front cover is provided with a front cover inlet, the rear cover is provided with a rear cover inlet, and the rear cover is also provided with a waste outlet.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model has a simple overall structure, high integration, and small size, and is suitable for a variety of use occasions. The utility model uses small-diameter tubes, medium-diameter tubes, and large-diameter tubes arranged in a circumferential manner with gaps to form heat exchange tubes. The different caliber arrangements solve the problem of uneven local heat exchange caused by the central fluid velocity being higher than the surrounding fluids, thereby increasing the overall flow rate of the heat exchange medium and improving the uniformity of heat exchange. Secondly, the design of the concave spherical surface at both ends of the heat exchange tube relatively prolongs the time for the central fluid to enter the heat exchange tube, reduces the time for the surrounding fluid to enter the heat exchange tube, further balances the overall velocity of the fluid, and improves the uniformity of heat exchange. Secondly, for gas heat dissipation media, the design of the matching of the guide cover and the concave spherical surface can also be used for drying air, which improves the adaptability of the air medium.

[0020] In general, the utility model improves the overall flow rate of the heat exchange medium, makes the fluid more evenly distributed in the tube, and has lower resistance in the heat exchange tube, more even heat exchange, and improved heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0022] Figure 2 It is a schematic exploded view of the overall structure of an embodiment of the utility model.

[0023] Figure 3 The figure is a schematic side view of a heat exchange tube structure according to an embodiment of the utility model.

[0024] Figure 4 It is a front view schematic diagram of a heat exchange tube structure of an embodiment of the utility model.

[0025] In the figure: front cover 1, front cover inlet 1.1, outer sleeve 2, medium inlet 2.1, medium outlet 2.2, rear cover 3, rear cover outlet 3.1, guide cover 3.2, heat exchange tube 4, small diameter tube 4.1, medium diameter tube 4.2, large diameter tube 4.3, concave spherical surface 4.4, inner cavity 4.5, branch pipe 4.6, medium deflector 5, fixing column 5.1, guide vane 5.2. DETAILED DESCRIPTION

[0026] 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 only 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.

[0027] A heat exchanger, also known as a heat exchanger or heat exchange equipment, is a device used to transfer heat from a hot fluid to a cold fluid to meet specific process requirements. It is an industrial application of convective heat transfer and heat conduction. Heat exchangers are widely used in many fields, including but not limited to electricity, chemical industry, food manufacturing, air conditioning and refrigerators.

[0028] The working principle of heat exchangers is mainly based on heat conduction and convection heat transfer. In a heat exchanger, hot and cold fluids flow through different flow channels, and the two flow crosswise inside the device. When the hot fluid passes through the heat transfer surface of the heat exchanger, its heat is transferred to the cold fluid by conduction. In addition, due to the temperature difference between the fluids, convection will also occur, further increasing the heat transfer efficiency. In application, heat exchangers can transfer heat efficiently and make effective use of thermal energy. In order to improve the heat transfer performance of heat exchangers, passive or active methods can be used. Passive methods, such as extending the heat transfer surface, are a common method that improves thermal efficiency by adding heat sinks, artificial roughness, etc. Active methods involve the use of external energy to enhance the heat transfer effect.

[0029] There are many types of heat exchangers. According to the operation process, they are divided into partition type, hybrid type, heat storage type (or heat recovery type); according to the surface compactness, they are divided into compact type and non-compact type; according to the structure, they are divided into tubular type (coil type, shell and tube type, shell and tube type, etc.), plate type (plate heat exchanger, spiral plate heat exchanger, plate-fin heat exchanger, etc.) and other types (scraped surface heat exchanger, rotary disc heat exchanger and air cooler, etc.).

[0030] Among them, the tubular heat exchanger is an important type of heat exchanger. Its structural principle is mainly composed of a shell, a heat transfer tube bundle, a tube sheet, a baffle (baffle) and a tube box. The shell is usually cylindrical, with a tube bundle inside, and both ends of the tube bundle are fixed on the tube sheet. During the heat exchange process, one fluid flows inside the tube, called the tube-side fluid; the other flows outside the tube, called the shell-side fluid. In order to improve the heat transfer efficiency, baffles are usually installed in the shell to increase the velocity and turbulence of the shell-side fluid.

[0031] Although tubular heat exchangers may not be as good as some other types of heat exchangers (such as plate and plate-fin heat exchangers) in terms of compactness and heat transfer efficiency, they still occupy an important position in the application of chemical, petroleum and energy industries due to their above-mentioned advantages.

[0032] Tubular heat exchangers have the following advantages:

[0033] 1. Easy to manufacture: Its structure is relatively simple, making the manufacturing process easier.

[0034] 2. Low production cost: Due to mature manufacturing technology and a wide range of material choices, the production cost is relatively low.

[0035] 3. Easy to clean: The tube bundle structure makes the cleaning process relatively simple and convenient.

[0036] 4. Strong adaptability: able to handle large amounts of fluid and adapt to high temperature and high pressure working environments.

[0037] Although tubular heat exchangers may not be as good as some other types of heat exchangers (such as plate and plate-fin heat exchangers) in terms of compactness and heat transfer efficiency, they still occupy an important position in the application of chemical, petroleum and energy industries due to their above-mentioned advantages.

[0038] It is particularly worth mentioning that the shell and tube heat exchanger is a type of tubular heat exchanger. It has a simple structure, reliable operation, and can be manufactured using a variety of structural materials (mainly metal materials). It can be used under high temperature and high pressure. Therefore, it is one of the most widely used types of heat exchangers.

[0039] The existing tubular radiator includes a cylinder, a feed port, a discharge port, a water inlet, a water outlet and a plurality of heat exchange tubes. A first head and a second head are respectively provided at both ends of the cylinder. The feed port is provided on the first head, the discharge port is provided on the second head, the water inlet is provided on one side of the top of the cylinder, and the water outlet is provided on one side of the bottom of the cylinder. A first tube sheet is provided near the first head of the cylinder, and a second tube sheet is provided near the second head of the cylinder. A plurality of connecting holes are provided on the first tube sheet and the second tube sheet, and a corresponding group of connecting holes are connected to the outer circumference of both ends of the heat exchange tube. One end of the heat exchange tube is connected to the feed port, and the other end of the heat exchange tube is connected to the discharge port. The utility model has a simple structure. Cooling water enters the cylinder from the water inlet and wraps around the heat exchange tube, which greatly increases the heat exchange area and the heat exchange rate. At the same time, the material enters the heat exchange tube for cooling and is sent out, and the cooling water can be heated up for use, so as to circulate heat energy. The technical structure adopts a heat exchange tube as a heat exchange structure. The heat exchange tube is composed of a number of heat-conducting tubes with the same diameter. However, in actual use, due to friction, the fluid flow rate in the center of the tube body is higher than that in the surroundings, resulting in a large flow rate and a fast rate of the central fluid, while the flow rate and the rate of the surrounding fluid entering the heat exchange tube are small and slow, resulting in uneven local heat exchange and fluid retention. This phenomenon can also lead to uneven fluid distribution and slow overall rate. In order to solve the above problems, the present embodiment is provided.

[0040] Reference Figures 1 to 4 For this embodiment, Figure 1 This is a schematic diagram of the overall structure of this embodiment. Figure 2 The exploded schematic diagram of the overall structure of this embodiment is a low-resistance and high-efficiency heat exchanger, including an outer sleeve, which is a tubular structure with openings at both ends. A heat exchange tube is inserted into the outer sleeve, and the heat exchange tube is a columnar structure. The heat exchange tube is the main heat dissipation structure. The heat exchange tube is accommodated and fixed in the outer sleeve and connected to the sleeve as a whole. The heat exchange tube is composed of a number of branch tubes of different diameters arranged evenly around the circumference. When the heat exchange tube is in the sleeve, there is a gap between the branch tubes, and the gaps at both ends of the branch tube are closed. The gap composed of the heat exchange tube-sleeve-branch tube is called an inner cavity, and the inner cavity is used to store or pass heat exchange medium. The two end surfaces of the heat exchange tube are also provided with concave spherical surfaces formed by being recessed toward the center of the heat exchange tube, and the concave spherical surfaces can reduce the resistance of the heat exchange medium.

[0041] Furthermore, fins are arranged on the outer wall of the outer sleeve, and the fins are distributed along the length direction of the outer sleeve, and the shape of the fins can be straight fins or corrugated fins, which are used to increase the contact area between the heat exchanger and the external environment, thereby improving the heat dissipation efficiency. The material of the fins is the same as or different from that of the outer sleeve, and needs to be selected according to the specific working environment and use conditions to ensure that it has good thermal conductivity and durability.

[0042] In addition, in order to improve the overall strength and stability of the heat exchanger, end caps are provided at both ends of the outer tube, and a sealed connection is adopted between the end cap and the outer tube to prevent leakage of the medium. A through hole is provided in the center of the end cap for installing the connecting pipe, which fits tightly with the two end surfaces of the heat exchange tube to ensure that the medium can flow into and out of the heat exchanger smoothly.

[0043] In practical applications, this low-resistance and high-efficiency heat exchanger can be widely used in various occasions that require heat transfer and control, such as air conditioning, refrigeration, heating and other fields. By optimizing the structural design of the heat exchange tube, the heat exchanger can reduce the resistance of the heat exchange medium while ensuring efficient heat dissipation, thereby improving the energy efficiency of the entire system. In addition, the heat exchanger also has the advantages of simple structure, easy manufacturing and maintenance, which provides convenience for practical applications.

[0044] The outer sleeve is circular, and its two end heads are respectively connected to the front cover and the rear cover, and a medium inlet is provided on the outer circumference of the outer sleeve at one end close to the front cover, and a medium outlet is provided at one end close to the rear cover. The medium inlet is used to input heat exchange medium, and the medium outlet is used to output heat exchange medium. The medium inlet and the medium outlet are connected to the inner cavity to form a complete heat exchange channel. In this embodiment, the heat exchange medium is refrigerant, and the heat exchange medium is air. The device in this embodiment is used to cool air.

[0045] The inner wall of the outer sleeve is made of high-efficiency heat-conducting material to enhance its heat conduction performance, thereby improving heat exchange efficiency. At the same time, the front cover and the rear cover are also made of the same heat-conducting material as the outer sleeve, ensuring that the entire device can transfer heat evenly and quickly during the heat exchange process.

[0046] In order to further optimize the heat exchange effect, the front cover and the rear cover are also provided with a control device for adjusting the medium flow. Through the control device, the flow of the medium inlet and the medium outlet can be adjusted according to actual needs, thereby achieving precise control of the heat exchange speed and temperature.

[0047] In addition, in order to enhance the durability and stability of the outer sleeve, a protective layer is provided on its periphery. The protective layer is made of wear-resistant and corrosion-resistant materials, which can effectively prevent the outer sleeve from being damaged by the external environment during use.

[0048] In this embodiment, due to the use of high-efficiency heat-conducting materials and flow control devices, the entire device has excellent performance in cooling air. At the same time, the provision of the protective layer also increases the service life and reliability of the device, making it more suitable for various harsh working environments.

[0049] The heat exchange tube is a cylindrical structure, and the branch tube includes a small diameter tube, a middle diameter tube and a large diameter tube. The heat exchange tube is composed of a plurality of small diameter tubes, middle diameter tubes and large diameter tubes arranged in a circle with gaps. The gaps at both ends of the small diameter tubes, middle diameter tubes and large diameter tubes are closed. The closed gap formed between adjacent branch tubes is called an inner cavity. When the heat exchange medium is a liquid, due to the friction of the tube wall, the heat exchange medium will flow in the tube. The flow rate of the heat exchange medium in the center of the tube is higher than the flow rate of the surrounding areas, which will cause uneven cooling of the fluid and slow fluid speed. In this embodiment, a small diameter tube, middle diameter tube and large diameter tube are arranged in a circle with gaps. The specific arrangement method is as follows: A plurality of small-diameter tubes are evenly distributed on the end surface near the fixed column mouth, a plurality of large-diameter tubes are evenly distributed on the end surface of the heat exchange tube near the edge, and a plurality of medium-diameter tubes are evenly distributed on the end surface between the small-diameter tube and the large-diameter tube. In this embodiment, the small-diameter tubes are arranged in one circle, the large-diameter tubes are arranged in two circles, and the medium-diameter tubes are arranged in four circles. The small-diameter tube is located at the center of the heat exchange tube. The small diameter can reduce the flow rate of the heat exchange medium at the center, and the large diameter can reduce the resistance of the heat exchange medium around. The medium diameter is used to balance the overall flow rate, so that the overall flow rate in the tube is more balanced, and the efficiency of entering the branch pipe is higher, thereby making the heat exchange of the heat exchange medium more uniform, reducing the overall resistance, and improving the transmission efficiency.

[0050] In addition, the heat exchange tube adopts a concave spherical design, which relatively prolongs the time for the central fluid to enter the heat exchange tube and reduces the time for the surrounding fluid to enter the heat exchange tube, further balancing the overall velocity of the fluid and improving the uniformity of heat exchange.

[0051] The device of this embodiment also includes a medium guide, which includes a fixed column and a guide vane. The medium guide is installed in the inner cavity and is used to guide the heat exchange medium, accelerate the flow rate of the heat exchange medium, and improve the temperature control sensitivity of the heat exchange medium. A fixed column mouth penetrating the heat exchange tube is provided on the axis of the heat exchange tube, and a fixed column is sealed and penetrated at the fixed column mouth. The fixed column is connected to the heat exchange tube as a whole, and a spiral guide vane is integrally provided on the outer periphery of the fixed column. The guide vane is located in the inner cavity, and the branch pipe seals and penetrates the guide vane. The spiral direction of the guide vane is from the medium inlet to the medium outlet. The heat exchange medium is guided by the guide vane in the inner cavity so that the heat exchange medium can flow faster from the medium inlet to the medium outlet, thereby improving the flow rate of the heat exchange medium and further improving the control sensitivity of the heat exchange medium temperature.

[0052] In this embodiment, the front cover and the rear cover are respectively provided with a front cover inlet and a rear cover outlet, which are used to connect the conveying pipeline of the heat exchange medium. The rear cover is also provided with a guide cover, which matches the concave spherical surface. When the heat exchange medium is air, the heat exchange medium flows out from the concave spherical surface and impacts the guide cover. After the impact, the air will release the internal moisture and flow out through the sewage outlet set at the bottom of the rear cover, so as to achieve the purpose of drying the air.

[0053] Finally, it should be noted that the circle used in this embodiment is only an example. In actual applications, square, triangle and other shapes can be used according to the situation. These shape designs still belong to the technical field of this embodiment.

[0054] The beneficial effects of this embodiment are as follows:

[0055] This embodiment has a simple overall structure, high integration, and small size, and is suitable for a variety of use occasions. This embodiment uses small-diameter tubes, medium-diameter tubes, and large-diameter tubes arranged in a circumferential manner with gaps to form heat exchange tubes. The arrangement of different calibers solves the problem of uneven local heat exchange caused by the central fluid velocity being higher than the surrounding fluids, thereby increasing the overall flow rate of the heat exchange medium and improving the uniformity of heat exchange. Secondly, the design of the concave spherical surface at both ends of the heat exchange tube relatively prolongs the time for the central fluid to enter the heat exchange tube, reduces the time for the surrounding fluid to enter the heat exchange tube, further balances the overall velocity of the fluid, and improves the uniformity of heat exchange. Secondly, for gas heat dissipation media, the design of the matching of the guide cover and the concave spherical surface can also be used for drying air, which improves the adaptability of the air medium.

[0056] In general, this embodiment increases the overall flow rate of the heat exchange medium, makes the fluid more evenly distributed in the tube, and has lower resistance in the heat exchange tube, more even heat exchange, and improved heat exchange efficiency.

[0057] In addition to the above-mentioned embodiments, within the scope disclosed in the claims and the specification of the utility model, the technical features or technical data of the utility model can be reselected and combined to form new embodiments, which should also be regarded as specific embodiments of the utility model and within the protection scope of the utility model.

Claims

1. A low resistance and high efficiency heat exchanger, characterized in that: It includes an outer sleeve, which is a tubular structure with two ends open. A heat exchange tube is inserted into the outer sleeve. The heat exchange tube is a columnar structure, which is composed of a number of branch tubes of different diameters evenly arranged around the circumference. There is a closed gap between the branch tubes in the heat exchange tube, which is an inner cavity. The two end surfaces of the heat exchange tube are also provided with concave spherical surfaces that are recessed toward the center of the heat exchange tube.

2. The low-resistance and high-efficiency heat exchanger according to claim 1, characterized in that: The two ends of the outer sleeve are respectively connected to the front cover and the rear cover, and a medium inlet is provided on the outer circumference of the outer sleeve near the front cover, and a medium outlet is provided on the end near the rear cover. The heat exchange tube is accommodated and fixed in the outer sleeve.

3. The low-resistance and high-efficiency heat exchanger according to claim 1 or 2, characterized in that: The heat exchange tube is a columnar structure, and the branch tube includes a small diameter tube, a middle diameter tube and a large diameter tube. The heat exchange tube is composed of a plurality of small diameter tubes, middle diameter tubes and large diameter tubes arranged in a circle with gaps. The gaps at both ends of the small diameter tubes, middle diameter tubes and large diameter tubes are closed, and the closed gap formed between adjacent branch tubes is called an inner cavity.

4. The low-resistance and high-efficiency heat exchanger according to claim 1, characterized in that: A fixed column opening penetrating the heat exchange tube is arranged on the axis of the heat exchange tube, a plurality of small-diameter tubes are evenly distributed on the end surface of the heat exchange tube near the fixed column opening, a plurality of large-diameter tubes are evenly distributed on the end surface of the heat exchange tube near the edge, and a plurality of medium-diameter tubes are evenly distributed on the end surface between the small-diameter tube and the large-diameter tube.

5. The low-resistance and high-efficiency heat exchanger according to claim 4, characterized in that: A fixing column is sealed and penetrated at the fixed column mouth, the fixing column is connected with the heat exchange tube as a whole, a spiral guide vane is integrally provided on the outer periphery of the fixing column, the guide vane is located in the inner cavity, and the branch pipe seal passes through the guide vane.

6. The low-resistance and high-efficiency heat exchanger according to claim 2, characterized in that: The rear end cover is hemispherical, and a hemispherical air deflector is extended outward from the bottom surface, and the spherical surface is farther than the rear end cover, and the spherical surface of the air deflector matches the concave spherical surface.

7. The low-resistance and high-efficiency heat exchanger according to claim 2, characterized in that: The medium inlet and the medium outlet are communicated with the inner cavity.

8. The low-resistance and high-efficiency heat exchanger according to claim 6, characterized in that: The front cover is provided with a front cover inlet, the rear cover is provided with a rear cover outlet, and the rear cover is also provided with a waste outlet.

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