Shell-and-tube heat exchanger

Abstract

The utility model relates to the field of heat exchangers, and discloses a shell-and-tube heat exchanger, which comprises an outer tube part, an inner tube part and an inner tube part, the inner tube part is mounted in the outer tube part and is used for conveying tube pass fluid; the outer pipe part comprises an outer pipe shell and a spiral blade, the spiral blade is installed in the outer pipe shell, and the spiral blade is used for increasing the flowing distance of shell pass fluid and enhancing the flowing disturbance of the shell pass fluid. According to the heat exchanger, the heat exchange area of the outer surface of the inner pipe can be increased to the maximum extent in a limited size space through the spiral blade and the second heat exchange pipe, meanwhile, the influence of the flow speed of a refrigerant is considered, and it is ensured that when the refrigerant flows through the heat exchanger, a certain flow speed can be kept so as to maintain system efficiency; and enough time can be provided for sufficient heat exchange.

Description

Technical Field

[0001] The utility model relates to the field of heat exchangers, in particular to a shell and tube heat exchanger. Background Art

[0002] The shell and tube heat exchanger used in refrigeration equipment is an important refrigeration component, which is mainly used to realize the heat exchange of the refrigerant fluid in the refrigeration system to achieve the purpose of cooling.

[0003] In refrigeration systems, shell and tube heat exchangers are usually used in evaporators, condensers, superheaters, and subcoolers. The shell and tube heat exchanger in the evaporator is responsible for evaporating the refrigerant from liquid to gas, absorbing the heat of the cooled material; while the shell and tube heat exchanger in the condenser is responsible for condensing the refrigerant from gas to liquid, releasing heat to the environment.

[0004] In the existing shell and tube heat exchanger design, the heat sink is usually tightly attached to the inner tube, aiming to increase the heat exchange area of ​​the outer surface of the inner tube and improve the heat exchange efficiency. However, in actual operation, especially in the limited size and space of the shell and tube heat exchanger, the refrigerant flowing through the outer tube often cannot fully contact the refrigerant on the inner tube due to the high flow rate, resulting in poor heat exchange effect. At the same time, the refrigerant flowing through the inner tube also faces the problem of insufficient heat exchange due to the same high flow rate.

[0005] Specifically, when the refrigerant flow rate in the outer tube is too high, the refrigerant's residence time in the tube is shortened, and it is unable to fully absorb or release heat. Similarly, the refrigerant in the inner tube is also difficult to fully exchange heat with the heat sink at a high flow rate. This situation is particularly prominent in small and compact refrigeration equipment, because these equipment have strict restrictions on the size of the heat exchanger and often need to achieve efficient heat exchange in a limited space. Utility Model Content

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: a shell and tube heat exchanger, comprising: an outer tube portion, used to transport shell-side fluid; an inner tube portion, installed in the outer tube portion, used to transport tube-side fluid; the outer tube portion comprises an outer tube shell and spiral blades, the spiral blades are installed in the outer tube shell, and the spiral blades are used to increase the flow distance of the shell-side fluid and enhance the flow disturbance of the shell-side fluid; the inner tube portion comprises a plurality of first heat exchange tubes, which are installed in the outer tube shell and connected to the spiral blades, and second heat exchange tubes are installed at both ends of the first heat exchange tube, and the second heat exchange tube is spiral, and its spiral shape increases the heat exchange area and increases the flow distance of the tube-side fluid.

[0007] The outer tube part also includes: two connecting pipes, which are symmetrically installed on the outer tube shell and are used for introducing and exporting shell-side fluid.

[0008] The inner tube part also includes: two inner tube shells, which are respectively installed at the two ends of the outer tube shell and connected to the second heat exchange tubes. The tube-side fluid is sent into the multiple second heat exchange tubes through the inner tube shells.

[0009] One end of the inner tube shell is provided with a plurality of fixing holes, and one end of the second heat exchange tube is connected to the fixing hole.

[0010] The spiral blade is provided with a plurality of assembly holes, and a plurality of first heat exchange tubes respectively penetrate through the plurality of assembly holes.

[0011] The inner wall of the outer tube shell is coated with an anti-corrosion coating.

[0012] The spiral shape of the spiral blade is an Archimedean spiral.

[0013] The cross-sections of the outer tube shell and the inner tube shell are both circular, wherein the inner diameter of the outer tube shell is larger than the outer diameter of the inner tube shell, ensuring that the inner tube shell can be smoothly installed inside the outer tube shell.

[0014] The utility model provides a shell and tube heat exchanger. Compared with the prior art, it has the following beneficial effects: 1. The heat exchange area of ​​the outer surface of the inner tube can be maximized within a limited space by means of spiral blades and a second heat exchange tube, while taking into account the influence of the refrigerant flow rate, ensuring that the refrigerant can maintain a certain flow rate to maintain system efficiency while having enough time for sufficient heat exchange when flowing through the heat exchanger. 2. The contact area between the refrigerant and the first heat exchange tube and the second heat exchange tube is effectively increased by means of spiral blades and a second heat exchange tube, reducing thermal resistance and improving heat exchange efficiency, so that the refrigerant can more fully absorb or release heat when flowing through the heat exchanger, thereby achieving more efficient heat exchange. 3. In view of the limitation of the size of the heat exchanger by miniaturized and compact refrigeration equipment, efficient heat exchange in a limited space is achieved, and the overall size and weight of the equipment are also ensured to be controlled within a reasonable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure proposed by the utility model.

[0016] Figure 2 This is a schematic diagram of the assembly structure of the inner tube shell, the first heat exchange tube, the second heat exchange tube and the spiral blades proposed by the utility model.

[0017] Figure 3 It is a partial cross-sectional structural schematic diagram of the inner tube part proposed by the utility model.

[0018] Figure 4 This is a partial cross-sectional structural schematic diagram of the outer tube portion proposed by the utility model.

[0019] Figure 5 This is a schematic diagram of the structure of the spiral blade proposed in the utility model.

[0020] The reference numerals in the figure are: 10, outer tube portion; 11, outer tube shell; 12, spiral blade; 13, connecting pipe; 14, assembly hole; 20, inner tube portion; 21, inner tube shell; 22, first heat exchange tube; 23, second heat exchange tube; 24, fixing hole. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0022] Reference Figure 1-Figure 5 A shell and tube heat exchanger comprises: an outer tube portion 10 for conveying shell-side fluid; an inner tube portion 20, installed in the outer tube portion 10, for conveying tube-side fluid; the outer tube portion 10 comprises an outer tube shell 11 and a spiral blade 12, the spiral blade 12 is installed in the outer tube shell 11, the spiral blade 12 in the outer tube portion 10 not only increases the flow distance of the shell-side fluid, but also its unique spiral shape greatly enhances the flow disturbance of the fluid, the flow disturbance helps to reduce the fluid boundary layer, and improves the heat transfer between the fluid and the inner wall of the heat exchanger The efficiency is improved, and the overall performance of the heat exchanger is significantly improved; the inner tube part 20 includes a plurality of first heat exchange tubes 22, which are installed in the outer tube shell 11 and connected to the spiral blades 12. Second heat exchange tubes 23 are installed at both ends of the first heat exchange tubes 22. The second heat exchange tubes 23 are spiral-shaped. The second heat exchange tubes 23 not only further increase the heat exchange area, but also increase the flow distance of the tube-side fluid. By increasing the flow distance, the residence time of the fluid in the tube is extended, which is conducive to more sufficient heat transfer and improves the heat exchange efficiency.

[0023] Reference Figure 1 and Figure 4 The outer tube portion 10 further includes: two connecting pipes 13, symmetrically mounted on the outer tube shell 11, for introducing and exporting shell-side fluid.

[0024] Reference Figure 2 and Figure 3 The inner tube portion 20 also includes: two inner tube shells 21, which are respectively installed at the two ends of the outer tube shell 11 and connected to the second heat exchange tubes 23. The tube-side fluid can pass through the multiple second heat exchange tubes 23 smoothly and stably. The tight connection structure not only ensures the flow stability of the fluid, but also helps to reduce energy loss and improve heat exchange efficiency.

[0025] Reference Figure 3 One end of the inner tube shell 21 is provided with a plurality of fixing holes 24 , and one end of the second heat exchange tube 23 is connected to the fixing hole 24 .

[0026] Reference Figure 5 The spiral blade 12 is provided with a plurality of assembly holes 14 , and the plurality of first heat exchange tubes 22 respectively pass through the plurality of assembly holes 14 .

[0027] Reference Figure 4 The inner wall of the outer tube shell 11 is coated with an anti-corrosion coating. The anti-corrosion coating coated on the inner wall of the outer tube shell 11 effectively prevents the shell-side fluid from corroding the inner wall of the heat exchanger. The anti-corrosion coating not only improves the durability of the heat exchanger, but also extends its service life and reduces maintenance costs.

[0028] Reference Figure 5 The spiral shape of the spiral blade 12 is an Archimedean spiral, which can maximize the contact area between the fluid and the spiral blade 12 without affecting the flow speed of the fluid.

[0029] Reference Figure 1 The cross-sections of the outer tube housing 11 and the inner tube housing 21 are both circular, wherein the inner diameter of the outer tube housing 11 is larger than the outer diameter of the inner tube housing 21 , ensuring that the inner tube housing 21 can be smoothly installed inside the outer tube housing 11 .

[0030] During use, the two connecting pipes 13 are opened, the shell-side fluid is introduced into the outer tube shell 11, and the tube-side fluid is introduced into the inner tube shell 21. The shell-side fluid enters the outer tube portion 10 through the connecting pipe 13, and when it passes through the area of ​​the spiral blades 12, it begins to flow in the outer tube shell 11 under the guidance of the spiral blades 12. The tube-side fluid enters the plurality of second heat exchange tubes 23 through the inner tube shell 21 and begins to flow in the inner tube portion 20. When the shell-side fluid flows in the outer tube shell 11, it encounters the obstruction and guidance of the spiral blades 12, and the flow distance increases. At the same time, the spiral blades 12 The spiral shape of the rotary blade 12 enhances the flow disturbance of the fluid. This flow disturbance reduces the fluid boundary layer and improves the heat transfer efficiency between the fluid and the inner wall of the heat exchanger. The tube-side fluid flows in multiple second heat exchange tubes 23. The spiral design prolongs the residence time of the fluid in the tube, which is conducive to more complete heat transfer. The refrigerant in the outer tube shell 11 exchanges heat with the refrigerant in the first heat exchange tube 22 and the second heat exchange tube 23. After sufficient heat exchange, the fluid discharged from the inner tube shell 21 is cooled and reaches a predetermined temperature or state.

[0031] In summary, compared with the prior art, the present invention has the following beneficial effects: the heat exchange area of ​​the outer surface of the inner tube can be maximized within a limited space size through the spiral blades 12 and the second heat exchange tube 23, while taking into account the influence of the refrigerant flow rate, ensuring that the refrigerant can maintain a certain flow rate to maintain system efficiency while having enough time for sufficient heat exchange when flowing through the heat exchanger; the contact area between the refrigerant and the first heat exchange tube 22 and the second heat exchange tube 23 is effectively increased through the spiral blades 12 and the second heat exchange tube 23, thereby reducing thermal resistance and improving heat exchange efficiency, so that the refrigerant can more fully absorb or release heat when flowing through the heat exchanger, thereby achieving more efficient heat exchange; in view of the restrictions on the size of the heat exchanger in miniaturized and compact refrigeration equipment, efficient heat exchange in a limited space is achieved, and the overall size and weight of the equipment are controlled within a reasonable range.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shell and tube heat exchanger, characterized in that: include: The outer tube portion (10) is used for conveying shell-side fluid; The inner tube portion (20) is installed in the outer tube portion (10) and is used for conveying the tube-side fluid; The outer tube portion (10) comprises an outer tube shell (11) and a spiral blade (12), wherein the spiral blade (12) is installed in the outer tube shell (11), and the spiral blade (12) is used to increase the flow distance of the shell-side fluid and enhance the flow disturbance of the shell-side fluid; The inner tube portion (20) comprises a plurality of first heat exchange tubes (22) which are installed in the outer tube shell (11) and connected to the spiral blades (12); second heat exchange tubes (23) are installed at both ends of the first heat exchange tubes (22); the second heat exchange tubes (23) are spiral-shaped, and the spiral shape increases the heat exchange area and the flow distance of the fluid in the tube side.

2. A shell and tube heat exchanger according to claim 1, characterized in that: The outer tube portion (10) further comprises: Two connecting pipes (13) are symmetrically mounted on the outer tube shell (11) and are used for introducing and exporting shell-side fluid.

3. The shell and tube heat exchanger according to claim 1, characterized in that: The inner tube portion (20) further comprises: The two inner tube shells (21) are respectively mounted at the two ends of the outer tube shell (11) and connected to the second heat exchange tubes (23); the tube-side fluid is delivered into the plurality of second heat exchange tubes (23) through the inner tube shells (21).

4. A shell and tube heat exchanger according to claim 3, characterized in that: One end of the inner tube shell (21) is provided with a plurality of fixing holes (24), and one end of the second heat exchange tube (23) is connected to the fixing hole (24).

5. The shell and tube heat exchanger according to claim 1, characterized in that: The spiral blade (12) is provided with a plurality of assembly holes (14), and the plurality of first heat exchange tubes (22) respectively penetrate the plurality of assembly holes (14).

6. The shell and tube heat exchanger according to claim 1, characterized in that: The inner wall of the outer tube shell (11) is coated with an anti-corrosion coating.

7. The shell and tube heat exchanger according to claim 1, characterized in that: The spiral shape of the spiral blade (12) is an Archimedean spiral.

8. The shell and tube heat exchanger according to claim 1, characterized in that: The cross-sections of the outer tube housing (11) and the inner tube housing (21) are both circular, wherein the inner diameter of the outer tube housing (11) is greater than the outer diameter of the inner tube housing (21), thereby ensuring that the inner tube housing (21) can be smoothly installed inside the outer tube housing (11).

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