Double-pipe heat exchanger

Abstract

The utility model discloses a double-pipe heat exchanger which comprises a pipe plate, an outer sleeve and a heat exchange pipe bundle. A heat exchange material channel is arranged in the heat exchange tube bundle, and a gap between the heat exchange tube bundle and the outer sleeve is a refrigerant channel. The heat exchange tube bundle comprises small heat exchange tubes and a main heat exchange tube, and the small heat exchange tubes are evenly distributed around the outer side of the main heat exchange tube. The heat exchange tube bundle adopts the double design of the heat exchange small tubes and the heat exchange main tube, and the heat exchange small tubes are uniformly distributed on the outer side of the heat exchange main tube, so that the heat exchange tube bundle is distributed in a petal shape, the heat exchange area of the heat exchanger is greatly increased, the heat exchange efficiency of the heat exchanger is better, and the heat exchange rate is improved; the petal-shaped distribution design can guide fluid to be subjected to heat exchange to form a turbulent flow path in the heat exchanger, the contact time and the contact area of the fluid and the outer wall of the heat exchange tube bundle are increased, the uniformity and the efficiency of heat exchange are improved, stress generated in the working process of the heat exchanger is further dispersed, and the structural strength and the stability are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to heat exchanger technical field, concretely relates to a double-pipe heat exchanger. BACKGROUND

[0002] Double-pipe heat exchanger is widely used in refrigeration air conditioning, petrochemical, pharmaceutical, food and other industries due to its strong anti-freezing, anti-fouling and anti-corrosion ability, and is used as condenser, evaporator and other devices on water-cooled cold and hot water fan unit, air-cooled cold water heat pump unit, water source or ground source heat pump unit, heat recovery machine and other related equipment. The existing double-pipe heat exchanger has low heat exchange rate and unsatisfactory overall heat exchange effect when in use. SUMMARY

[0003] The utility model discloses a double-pipe heat exchanger, which has reasonable design and strong practicability. The heat exchange tube bundle adopts double design of heat exchange small pipes and heat exchange main pipes, and the heat exchange small pipes are evenly distributed outside the heat exchange main pipes. The heat exchange tube bundle is designed in petal shape, which greatly increases the heat exchange area of the heat exchanger, improves the heat exchange efficiency of the heat exchanger, and increases the heat exchange rate. The petal-shaped distribution design can guide the formation of turbulent flow path of the fluid to be exchanged in the heat exchanger, increase the contact time and contact area with the outer wall of the heat exchange tube bundle, improve the uniformity and efficiency of heat exchange, and help to disperse the stress generated during the operation of the heat exchanger, improve the structural strength and stability.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A double-pipe heat exchanger includes a tube sheet, an outer sleeve pipe and a heat exchange tube bundle. The outer sleeve pipe and the heat exchange tube bundle are connected with the tube sheet, and the heat exchange tube bundle is located in the outer sleeve pipe. The heat exchange tube bundle is a heat exchange material channel, and the gap between the heat exchange tube bundle and the outer sleeve pipe is a refrigerant channel. The heat exchange tube bundle includes heat exchange small pipes and a heat exchange main pipe, and the heat exchange small pipes are evenly distributed outside the heat exchange main pipe. The heat exchange tube bundle adopts double design of heat exchange small pipes and heat exchange main pipes, and the heat exchange small pipes are evenly distributed outside the heat exchange main pipe. The heat exchange tube bundle is designed in petal shape, which greatly increases the heat exchange area of the heat exchanger, improves the heat exchange efficiency of the heat exchanger, and increases the heat exchange rate. The petal-shaped distribution design can guide the formation of turbulent flow path of the fluid to be exchanged in the heat exchanger, increase the contact time and contact area with the outer wall of the heat exchange tube bundle, improve the uniformity and efficiency of heat exchange, and help to disperse the stress generated during the operation of the heat exchanger, improve the structural strength and stability.

[0006] Further, the outer sleeve is made of carbon steel pipe or stainless steel pipe, and the wall thickness of the outer sleeve is 0.3-3.5 mm. The outer sleeve made of carbon steel pipe has low cost, high strength and toughness, and is suitable for more fluid media and working environments, so that the heat exchanger has wider applicability. The outer sleeve made of stainless steel pipe has excellent corrosion resistance and can withstand harsh working environments of high temperature and high pressure, improving the adaptability and flexibility of the equipment. The wall thickness of the outer sleeve is 0.3-3.5 mm, which not only ensures the structural strength, but also reduces the overall weight, making it easier to assemble and transport the equipment, saving materials and reducing costs.

[0007] Further, the heat exchange small pipe and the heat exchange main pipe are corrugated spiral pipes, which are designed ingeniously. The corrugated spiral shape design can optimize the fluid flow path, so that the fluid flowing in the pipe will produce turbulent flow, thereby improving the heat transfer efficiency.

[0008] Further, the heat exchange small pipe and the heat exchange main pipe are made of stainless steel pipe, copper pipe, copper alloy pipe or titanium alloy pipe, and the wall thickness of the heat exchange small pipe and the heat exchange main pipe is 0.1-2 mm. The heat exchange tube bundle made of stainless steel pipe has good corrosion resistance and high strength, which can ensure the service life of the heat exchange tube bundle. The heat exchange tube bundle made of copper pipe has good heat conductivity, which can improve the heat exchange efficiency. The heat exchange tube bundle made of copper alloy pipe has excellent comprehensive performance, which can be suitable for various working environments and medium conditions, meet different heat exchange requirements, and facilitate the welding operation between the heat exchange tube bundle and the tube plate. The heat exchange tube bundle made of titanium alloy pipe has high strength and toughness, good corrosion resistance, and light weight. The heat exchange tube bundle can be made of corresponding materials according to actual needs. The wall thickness of the heat exchange small pipe and the heat exchange main pipe is designed to be 0.1-2 mm. The thin pipe wall can significantly reduce the thermal resistance, so that the heat transfer speed in the heat exchange tube bundle is faster, which helps to improve the heat exchange efficiency of the heat exchanger. The use of thinner heat exchange tube bundle can reduce the weight of the entire heat exchanger, making it easier to assemble and transport the equipment, saving materials and reducing costs.

[0009] Further, the tube plate is connected with the cover, the cover is connected with the water connection pipe, and the water connection pipe is connected with the copper joint. The structure is designed reasonably, and the copper joint is usually designed in a standardized manner. The copper joint can facilitate the connection between the device and other components, making it easy to install and disassemble.

[0010] Further, the diameter of the heat exchange small pipe is 1 / 6-1 / 2 of the diameter of the heat exchange main pipe. The size is designed reasonably. The smaller diameter of the heat exchange small pipe can distribute more heat exchange small pipes in the same space, increase the total heat exchange area of the heat exchanger, and improve the heat exchange efficiency. The smaller diameter makes the structure of the heat exchanger more compact, which helps to reduce the overall weight of the heat exchanger.

[0011] Further, the pipe diameter cross-sectional area of the heat exchange main pipe is 30% to 70% of the pipe diameter cross-sectional area of the outer sleeve pipe, the pipe diameter cross-sectional area is designed so that a proper gap can be formed between the outer sleeve pipe and the heat exchange pipe bundle, the gap is conducive to the circulation of the refrigerant, the fluid disturbance is enhanced, the contact area and contact time between the refrigerant and the outer wall of the heat exchange pipe bundle are ensured, the heat exchange efficiency is ensured, the overall volume of the heat exchanger can be reduced by reasonably controlling the ratio of the pipe diameter cross-sectional area of the heat exchange main pipe to the pipe diameter cross-sectional area of the outer sleeve pipe, and the structure design is more compact and reasonable.

[0012] Further, the connection between the heat exchange small pipe and the tube plate and the connection between the heat exchange main pipe and the tube plate are fixed by welding or expansion, the welding fixation can ensure the connection strength and good sealing performance, the expansion connection process is simple, the material and labor cost are low, and the expansion and welding combined connection is adopted, the tube plate is provided with holes matched with the end portions of the heat exchange main pipe and the heat exchange small pipe, so that the heat exchange main pipe and the heat exchange small pipe can be accurately installed on the tube plate, the installation accuracy and efficiency are improved, and the overall structural stability and reliability of the heat exchanger are ensured.

[0013] Further, the heat exchange small pipe and the heat exchange main pipe are in close contact or have a gap of 0-3mm, the adjacent heat exchange small pipes are in close contact or have a gap of 0-3mm, and the heat exchange small pipe and the outer sleeve pipe are in close contact or have a gap of 0-2mm, the structure design is ingenious and reasonable, and the compact gap design can make the overall structure of the heat exchanger more compact and reasonable, reduce the volume of the heat exchanger, and improve the space utilization.

[0014] Further, the inlet end of the heat exchange main pipe is provided with a throttling plate, the throttling plate has a throttling effect, can ensure the distribution and uniformity of the fluid flow of the heat exchange main pipe and the heat exchange small pipe, reduce the insufficient heat exchange or overheating phenomenon caused by uneven flow, improve the overall heat exchange efficiency, and ensure the stability and reliability of the equipment.

[0015] The utility model discloses have the following beneficial effects because of adopting the above technical scheme:

[0016] The utility model discloses reasonable, practicality is strong, and the heat exchange pipe bundle adopts the double design of heat exchange small pipe and heat exchange main pipe, and the heat exchange small pipe is evenly distributed outside the heat exchange main pipe, makes the heat exchange pipe bundle present petal -shaped distribution design, greatly increased the heat exchange area of heat exchanger, makes the heat exchange efficiency of heat exchanger better, improves the heat exchange rate, and petal -shaped distribution design can guide the flow path of the turbulent flow of the fluid to be heat exchanged in the heat exchanger, increases the contact time and contact area of the outer wall of the heat exchange pipe bundle, improves the uniformity and efficiency of heat exchange, and the structure design also helps to disperse the stress generated in the work of the heat exchanger, improves the structural strength and stability. DRAWINGS

[0017] The utility model discloses make further explanation to the utility model below in conjunction with the drawing:

[0018] Figure 1 This is a schematic diagram of the structure of a shell-and-tube heat exchanger according to the present invention;

[0019] Figure 2 This is a schematic diagram of the connection structure of the cover, tube sheet, heat exchange tube bundle and outer tube in this utility model;

[0020] Figure 3 Figure 1 shows an embodiment of this invention in which the heat exchange tubes are evenly distributed on the outside of the main heat exchange tube;

[0021] Figure 4 This is a second embodiment of the present invention, in which the heat exchange tubes are evenly distributed on the outside of the heat exchange main tube.

[0022] In the diagram, 1-tube sheet; 2-outer tube; 3-heat exchange material channel; 4-heat exchange tube; 5-heat exchange main tube; 6-cover; 7-water connection; 8-copper joint; 9-refrigerant channel; 10-heat exchange tube one; 11-heat exchange tube two; 12-refrigerant flow hole. Detailed Implementation

[0023] like Figures 1 to 4 As shown, this utility model discloses a shell-and-tube heat exchanger, comprising a tube sheet 1, an outer tube 2, and a heat exchange tube bundle. Both the outer tube 2 and the heat exchange tube bundle are connected to the tube sheet 1, with the heat exchange tube bundle located inside the outer tube 2. The heat exchange tube bundle contains heat exchange material channels 3, and the gap between the heat exchange tube bundle and the outer tube 2 serves as a refrigerant channel 9. The heat exchange tube bundle includes heat exchange sub-tubes 4 and a heat exchange main tube 5, with the sub-tubes 4 evenly distributed around the outer side of the heat exchange main tube 5. The inner side of the heat exchange tube 4 and the inner side of the heat exchange main tube 5 are heat exchange material channels 3, through which the fluid to be heat exchanged flows. The outer side of the heat exchange tube 4, the outer side of the heat exchange main tube 5, and the inner side of the outer sleeve 2 are refrigerant channels 9, through which the refrigerant flows. The outer sleeve 2 is provided with a refrigerant flow hole 12, which is connected to the refrigerant channel 9 to facilitate the entry and exit of the refrigerant. The heat exchange tube bundle adopts a dual design of heat exchange tube 4 and heat exchange main tube 5, and the heat exchange tube 4 is evenly distributed on the outer side of the heat exchange main tube 5, so that the heat exchange tube bundle has a petal-shaped distribution design, which greatly increases the heat exchange area of ​​the heat exchanger, making the heat exchanger more efficient and increasing the heat exchange rate. Moreover, the petal-shaped distribution design can guide the refrigerant to form a turbulent flow path in the heat exchanger, increasing the contact time and contact area with the outer wall of the heat exchange tube bundle, improving the uniformity and efficiency of heat exchange. In addition, this structural design also helps to disperse the stress generated during the operation of the heat exchanger, improving the structural strength and stability. Tube sheet 1 is connected to cover 6. Cover 6 has a cavity that matches the tube sheet, which facilitates precise assembly between the two. Cover 6 is connected to water pipe 7. Water pipe 7 is connected to copper connector 8. The structure is reasonably designed. Copper connector 8 usually adopts a standardized design. Through copper connector 8, the device can be easily connected to other components, making it easy to install and disassemble.

[0024] The heat exchange small tubes 4 include heat exchange small tube one 10 and heat exchange small tube two 11, which are uniformly distributed on the outer side of the heat exchange main tube 5 in the circumferential direction. In actual design, the heat exchange small tube one 10 and the heat exchange small tube two 11 can be arranged on the same circumference (as shown in FIG. 2) ; the heat exchange small tube one 10 and the heat exchange small tube two 11 can also not be arranged on the same circumference, and several heat exchange small tube ones 10 are arranged on the same circumference, and several heat exchange small tube twos 11 are arranged on the same circumference (as shown in FIG. 3). Figure 3 Figure 4

[0025] The outer sleeve tube 2 is made of carbon steel pipe or stainless steel pipe, and the wall thickness of the outer sleeve tube 2 is 0.3-3.5 mm. The outer sleeve tube 2 made of carbon steel pipe has low cost and high strength and toughness, and is suitable for more fluid media and working environments, so that the heat exchanger has wider applicability. The outer sleeve tube 2 made of stainless steel pipe has excellent corrosion resistance and can withstand harsh working environments of high temperature and high pressure, improving the adaptability and flexibility of the equipment. The wall thickness of the outer sleeve tube 2 is 0.3-3.5 mm, which not only ensures the structural strength, but also reduces the overall weight, making it easier to assemble and transport the equipment, saving materials and reducing costs. The heat exchange small tube 4 and the heat exchange main tube 5 are corrugated spiral tubes, which are designed ingeniously. The corrugated spiral shape can optimize the fluid flow path, so that the fluid flowing in the pipe will produce turbulent flow, thereby improving the heat transfer efficiency.

[0026] The heat exchange small tube 4 and the heat exchange main tube 5 are made of stainless steel pipe, copper pipe, copper alloy pipe or titanium alloy pipe, and the wall thickness of the heat exchange small tube 4 and the heat exchange main tube 5 is 0.1-2 mm. The heat exchange tube bundle made of stainless steel pipe has good corrosion resistance and high strength, which can ensure the service life of the heat exchange tube bundle. The heat exchange tube bundle made of copper pipe has good heat conductivity, which can improve the heat exchange efficiency. The heat exchange tube bundle made of copper alloy pipe has excellent comprehensive performance, which can be suitable for various working environments and medium conditions to meet different heat exchange requirements. Moreover, this design is also convenient for welding between the heat exchange tube bundle and the tube plate 1. The heat exchange tube bundle made of titanium alloy pipe has high strength and toughness, good corrosion resistance and light weight. The corresponding material can be selected according to the actual requirements to make the heat exchange tube bundle. The wall thickness of the heat exchange small tube 4 and the heat exchange main tube 5 is designed to be 0.1-2 mm. The thinner tube wall can significantly reduce the thermal resistance, so that the heat transfer speed in the heat exchange tube bundle is faster, which helps to improve the heat exchange efficiency of the heat exchanger. Moreover, the use of thinner heat exchange tube bundle can reduce the weight of the entire heat exchanger, making it easier to assemble and transport the equipment, saving materials and reducing costs.

[0027] ​​The pipe diameter of the heat exchange small pipes 4 is 1 / 6-1 / 2 of the pipe diameter of the heat exchange main pipes 5, the size is reasonably designed, the pipe diameter of the heat exchange small pipes 4 is smaller, more heat exchange small pipes 4 can be distributed in the same space, the total heat exchange area of the heat exchanger is increased, the heat exchange efficiency is improved, and the pipe diameter is smaller, so that the structure of the heat exchanger is more compact, and the overall weight of the heat exchanger is reduced. The pipe diameter cross-sectional area of the heat exchange main pipes 5 is 30%-70% of the pipe diameter cross-sectional area of the outer sleeve pipes 2, the design of the pipe diameter cross-sectional area makes the outer sleeve pipes 2 and the heat exchange pipe bundle form appropriate gaps, which is helpful for the circulation of the refrigerant in the gaps, enhances the fluid disturbance, ensures the contact area and contact time between the refrigerant and the outer wall of the heat exchange pipe bundle, thereby ensuring the heat exchange efficiency, and reasonably controlling the ratio of the pipe diameter cross-sectional area of the heat exchange main pipes 5 and the outer sleeve pipes 2 can reduce the overall volume of the heat exchanger, so that the structure design is more compact and reasonable.

[0028] The connection between the heat exchange small pipes 4 and the tube plate 1 and the connection between the heat exchange main pipes 5 and the tube plate 1 are fixed by welding or expansion, the welding can ensure the connection strength and good sealing performance, the expansion connection process is simple, the material and labor cost is low, and the expansion welding combination connection is adopted. The tube plate 1 is provided with holes matched with the ends of the heat exchange main pipes 5 and the heat exchange small pipes 4, so that the heat exchange main pipes 5 and the heat exchange small pipes 4 can be accurately installed on the tube plate 1, the installation accuracy and efficiency are improved, and the overall structural stability and reliability of the heat exchanger are ensured.

[0029] The heat exchange small pipes 4 and the heat exchange main pipes 5 are in close contact or have a gap of 0-3mm, the adjacent heat exchange small pipes 4 are in close contact or have a gap of 0-3mm, and the heat exchange small pipes 4 and the outer sleeve pipes 2 are in close contact or have a gap of 0-2mm, the structure is designed ingeniously and reasonably, the close gap design can make the overall structure of the heat exchanger more compact and reasonable, reduce the volume of the heat exchanger, and improve the space utilization. The inlet end of the heat exchange main pipes 5 is provided with a throttling plate (not shown in the figure), the throttling plate has a throttling effect, ensures the distribution and uniformity of the fluid flow of the heat exchange main pipes 5 and the heat exchange small pipes 4, reduces the insufficient heat exchange or overheating phenomenon caused by uneven flow, thereby improves the overall heat exchange efficiency, and ensures the stability and reliability of the equipment.

[0030] The above is only a specific embodiment of the present application, but the technical features of the present application are not limited to this. Any simple change, equivalent replacement or modification made on the basis of the present application to solve basically the same technical problem and achieve basically the same technical effect is also covered by the protection scope of the present application.

Claims

1. A double-pipe heat exchanger comprising a tube sheet, an outer sleeve and a heat exchange tube bundle, the outer sleeve and the heat exchange tube bundle being connected with the tube sheet, the heat exchange tube bundle being located in the outer sleeve; characterized in that: a heat exchange medium channel is formed in the heat exchange tube bundle, and a gap between the heat exchange tube bundle and the outer sleeve is a refrigerant channel; the heat exchange tube bundle comprises heat exchange small tubes and a heat exchange main tube, and the heat exchange small tubes are uniformly distributed around the outer side of the heat exchange main tube.

2. The outer sleeve is made of a carbon steel pipe or a stainless steel pipe, and the wall thickness of the outer sleeve is 0.3-3.5 mm.

3. The heat exchange small tubes and the heat exchange main tube are corrugated spiral tubes.

4. The heat exchange small tubes and the heat exchange main tube are made of stainless steel pipes, copper pipes, copper alloy pipes or titanium alloy pipes, and the wall thickness of the heat exchange small tubes and the heat exchange main tube is 0.1-2 mm.

2. A double pipe heat exchanger according to claim 1, characterized in that:

5. The tube sheet is connected with a cover, the cover is connected with a water connection pipe, and the water connection pipe is connected with a copper joint.

3. A double pipe heat exchanger according to claim 1, characterized in that:

6. The tube diameter of the heat exchange small tubes is 1 / 6-1 / 2 of the tube diameter of the heat exchange main tube.

4. A double pipe heat exchanger according to claim 1, characterized in that:

7. The tube diameter cross-sectional area of the heat exchange main tube is 30%-70% of the tube diameter cross-sectional area of the outer sleeve.

5. A double pipe heat exchanger according to claim 1, characterized in that:

8. The connection between the heat exchange small tubes and the tube sheet and the connection between the heat exchange main tube and the tube sheet are fixed by welding or expansion.

6. A double pipe heat exchanger according to claim 1, characterized in that:

9. The heat exchange small tubes and the heat exchange main tube are in close contact or have a gap of 0-3 mm, the adjacent heat exchange small tubes are in close contact or have a gap of 0-3 mm, and the heat exchange small tubes and the outer sleeve are in close contact or have a gap of 0-2 mm.

7. A double pipe heat exchanger according to claim 1, characterized in that:

10. The inlet end of the heat exchange main tube is provided with a throttle plate.

8. A double pipe heat exchanger according to claim 1, characterized in that: ​ 9. A double pipe heat exchanger according to claim 1, characterized in that: ​ 10. A double pipe heat exchanger according to claim 1, characterized in that: ​

Images