Multi-tube-pass shell-and-tube heat exchanger structure

Abstract

The utility model discloses a multi-tube-pass shell-and-tube heat exchanger structure which comprises a shell and a tube plate, the tube plate is arranged at one end of the shell, and a liquid inlet cavity and a gas collecting cavity are arranged on the tube plate. At least two groups of U-shaped heat exchange tube units which are distributed up and down are arranged in the shell, and each U-shaped heat exchange tube unit consists of a plurality of U-shaped heat exchange tubes. A backflow cover cap is arranged on the tube plate, a backflow cavity is formed between the backflow cover cap and the tube plate, the backflow cavity is arranged between the liquid inlet cavity and the gas collection cavity, and every two vertically-adjacent U-shaped heat exchange tube units are connected and communicated through the backflow cavity. The U-shaped heat exchanger is reasonable in design and strong in practicability, adopts the design of multiple groups of U-shaped heat exchange tube units which are distributed up and down, and is matched with the backflow cavity to realize conduction between the upper and lower adjacent U-shaped heat exchange tube units, so that the heat exchange tube pass is prolonged, the heat exchange time is prolonged, the heat exchange efficiency is improved, and the heat exchange performance requirement is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to heat exchanger technical field, concretely relates to a multi-tube-pass shell and tube heat exchanger structure. BACKGROUND

[0002] With the development of air conditioner outdoor unit to miniaturization, it will bring many aspects influence, on the one hand, reduce the material of outer casing to reduce manufacturing cost, on the other hand, with the continuous optimization of refrigeration, space layout application modularization greatly reduces the installation space size of outdoor. And due to the development of air conditioner outdoor unit space size to miniaturization, the traditional slender shell and tube heat exchanger is limited by installation space size, and new requirements are put forward. Due to the shortening of the shell length of shell and tube, the heat exchanger and tube bundle of traditional double-tube-pass structure cannot meet the requirement of heat exchange performance. UTILITY MODEL CONTENTS

[0003] The utility model aims at solving the above technical problems existing in prior art, provides a multi-tube-pass shell and tube heat exchanger structure, and the design is reasonable, and the practicality is strong, adopts the design of multiple groups of upper and lower distribution U type heat exchange pipe unit, and the backflow cavity is cooperated to realize the conduction between the upper and lower adjacent U type heat exchange pipe units, thereby prolonging the heat exchange pipe pass, increasing the heat exchange time, improving the heat exchange efficiency, and guaranteeing the heat exchange performance requirement.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A multi-tube-pass shell and tube heat exchanger structure, including shell body and tube sheet, the tube sheet is arranged at one end of the shell body, and the tube sheet is provided with liquid inlet cavity and gas collection cavity. At least two groups of U type heat exchange pipe units distributed in upper and lower are arranged in the shell body, and the U type heat exchange pipe unit is composed of several U type heat exchange pipes. The backflow cover is arranged on the tube sheet, and the backflow cavity is formed between the backflow cover and the tube sheet, and the backflow cavity is arranged between the liquid inlet cavity and the gas collection cavity. The upper and lower adjacent two groups of U type heat exchange pipe units are connected and conducted through the backflow cavity. The utility model has the advantages of reasonable design and strong practicality, adopts the design of multiple groups of upper and lower distribution U type heat exchange pipe unit, and the backflow cavity is cooperated to realize the conduction between the upper and lower adjacent U type heat exchange pipe units, thereby prolonging the heat exchange pipe pass, increasing the heat exchange time, improving the heat exchange efficiency, and guaranteeing the heat exchange performance requirement.

[0006] Further, the tube plate is provided with a mounting cover body, and the mounting cover body and the tube plate form a liquid inlet cavity and a gas collection cavity. The liquid inlet cavity and the gas collection cavity are assembled between the mounting cover body with a cavity and the tube plate or other structures with cavities and the tube plate. The structure design is ingenious and reasonable. The liquid inlet cavity is connected with a liquid inlet pipe, and the gas collection cavity is connected with a gas outlet pipe. The refrigerant medium enters the liquid inlet cavity from the liquid inlet pipe, flows into the lowermost U-shaped heat exchange pipe unit from the liquid inlet cavity, flows along the U-shaped heat exchange pipe unit, passes through the return flow cavity and flows through multiple groups of U-shaped heat exchange pipe units, and then flows from the uppermost U-shaped heat exchange pipe unit to the gas collection cavity and is discharged from the gas outlet pipe. The liquid inlet pipe is preferably designed as a straight pipe, and the gas outlet pipe is preferably designed as a bent pipe structure.

[0007] Further, the return flow cover is in a plate shape or a box shape. The plate-shaped return flow cover has a simple structure, is easy to manufacture and install, and can be provided with a slot hole. The return flow cover and the tube plate can form a return flow cavity through the slot hole provided on the return flow cover or the tube plate. The box-shaped return flow cover has a cavity, which ensures that the return flow cavity is formed between the box-shaped return flow cover and the tube plate, and the smooth flow of the refrigerant medium is ensured.

[0008] Further, the tube plate is provided with a positioning slot or cavity matched with the return flow cover. The positioning slot or cavity can facilitate the accurate installation of the return flow cover on the tube plate, improve the installation accuracy and efficiency, and ensure the stability of the overall structure of the heat exchanger.

[0009] Further, the connection between the U-shaped heat exchange pipe and the tube plate is fixed by welding, expansion or expansion and welding. The welding fixation can ensure the connection strength and good sealing performance. The expansion connection process is simple, and the material and labor costs are low. The expansion and welding combination connection can effectively ensure the connection strength and reliability between the U-shaped heat exchange pipe and the tube plate, so that the heat exchanger can be applied to more severe environments, and the adaptability and flexibility of the equipment are improved.

[0010] Further, the U-shaped heat exchange pipe is made of stainless steel pipe, copper pipe, copper alloy pipe or titanium alloy pipe. The U-shaped heat exchange pipe made of stainless steel pipe has good corrosion resistance and high strength, which can ensure the service life of the U-shaped heat exchange pipe. The U-shaped heat exchange pipe made of copper pipe has good heat conductivity, which can improve the heat exchange efficiency. The U-shaped heat exchange pipe made of copper alloy pipe has excellent comprehensive performance, which can be applied to various working environments and medium conditions to meet different heat exchange requirements. The design also facilitates the welding operation between the U-shaped heat exchange pipe and the tube plate. The U-shaped heat exchange pipe made of titanium alloy pipe has high strength and toughness, good corrosion resistance and light weight. The U-shaped heat exchange pipe can be made of corresponding materials according to actual needs.

[0011] Further, the U-shaped heat exchange pipe has a pipe diameter of 4-16 mm, and a wall thickness of 0.15-2.5 mm, so that the U-shaped heat exchange pipe has a small pipe diameter of 4-16 mm, the impact pressure of the U-shaped heat exchange pipe is increased, the service life is prolonged, the overall structure of the heat exchanger is more compact due to the small pipe diameter, the use of materials is saved, the wall thickness of the U-shaped heat exchange pipe is thin, i.e. 0.15-2.5 mm, so that heat can be transferred through the pipe wall more easily, the heat exchange efficiency is higher, the performance of the heat exchanger is improved, and the weight of the heat exchanger is reduced due to the thin wall thickness of the U-shaped heat exchange pipe, the equipment is more convenient to assemble and transport, materials are saved, and the cost is reduced.

[0012] Further, the shell has a circular or rectangular structure, and the shell of the heat exchanger is not limited to the circular or rectangular structure, and can be designed as needed.

[0013] Further, the shell is provided with baffles, the baffles have an arc structure or a spiral structure, the baffles with the arc structure are arranged from one end of the shell to the other end and are distributed in two rows, the two rows are staggered and spaced, so that the flow of the heat exchange medium is disturbed, the heat transfer efficiency is improved, the baffles with the spiral structure are arranged from one end of the shell to the other end, so that the heat exchange medium flows in a continuous spiral shape in the shell, the impact on the U-shaped heat exchange pipe unit is reduced, and the actual heat transfer efficiency is ensured.

[0014] Further, the shell-and-tube heat exchanger structure is suitable for single-system heat exchangers and double-system heat exchangers, and the application range of the heat exchanger is increased.

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

[0016] The utility model discloses reasonable, practicality is strong, a plurality of units are integrated and set up on a frame structure, compact structure layout is more, effectively utilize space, reduce the land area of device, also be more favorable to the connection assembly of pipeline between each component, improve the overall efficiency and reliability of device, also help actual installation, debugging and maintenance. The U-shaped heat exchange pipe in the application has a small pipe diameter of 4-16 mm, the impact pressure of the U-shaped heat exchange pipe is increased, the service life is prolonged, the overall structure of the heat exchanger is more compact due to the small pipe diameter, the use of materials is saved, the wall thickness of the U-shaped heat exchange pipe is thin, i.e. 0.15-2.5 mm, so that heat can be transferred through the pipe wall more easily, the heat exchange efficiency is higher, the performance of the heat exchanger is improved, and the weight of the heat exchanger is reduced due to the thin wall thickness of the U-shaped heat exchange pipe, the equipment is more convenient to assemble and transport, materials are saved, and the cost is reduced. DRAWINGS

[0017] The utility model will be further described below in combination with the drawings:

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

[0019] Figure 2 This is a schematic diagram of the distribution structure of the U-shaped heat exchange tube unit within the shell of this utility model;

[0020] Figure 3 This is a schematic diagram of the flow structure of the cooling medium when using a six-pass tube in this utility model;

[0021] Figure 4 This is a schematic diagram of the flow structure of the cooling medium using an eight-tube process in this utility model;

[0022] Figure 5 This is a schematic diagram of the flow structure of the cooling medium when using a ten-tube pass in this utility model.

[0023] In the figure, 1-shell; 2-tube sheet; 3-liquid inlet chamber; 4-gas collection chamber; 5-U-shaped heat exchange tube unit; 6-U-shaped heat exchange tube; 7-reflux cover; 8-reflux chamber; 9-mounting cover; 10-liquid inlet pipe; 11-gas outlet pipe; 12-baffle plate. Detailed Implementation

[0024] like Figures 1 to 5 As shown, this utility model discloses a multi-pass shell-and-tube heat exchanger structure, including a shell 1 and a tube sheet 2. The shell 1 has a circular or rectangular shape, and its shape is not limited; it can be designed as circular or rectangular as needed. The tube sheet 2 is located at one end of the shell 1 and has a liquid inlet chamber 3 and a gas collecting chamber 4. At least two sets of vertically distributed U-shaped heat exchange tube units 5 are arranged inside the shell 1. Each U-shaped heat exchange tube unit 5 consists of several U-shaped heat exchange tubes 6. A reflux cover 7 is provided on the tube sheet 2, forming a reflux chamber 8 between the reflux cover 7 and the tube sheet 2. The reflux chamber 8 is located between the liquid inlet chamber 3 and the gas collecting chamber 4, and adjacent sets of U-shaped heat exchange tube units 5 are connected and communicated through the reflux chamber 8. This utility model has a reasonable design and strong practicality. It adopts a design of multiple sets of U-shaped heat exchange tube units 5 distributed vertically, and works with a reflux cavity 8 to realize the conduction between adjacent U-shaped heat exchange tube units 5, thereby extending the heat exchange tube path, increasing the heat exchange time, improving the heat exchange efficiency, and thus ensuring the heat exchange performance requirements.

[0025] The tube plate 2 is provided with a mounting cover 9, and the mounting cover 9 and the tube plate 2 form a liquid inlet cavity 3 and a gas collection cavity 4. The liquid inlet cavity 3 and the gas collection cavity 4 are assembled by the mounting cover 9 with a cavity and the tube plate 2, or other structures with a cavity and the tube plate 2. The structure is ingenious and reasonable. The liquid inlet cavity 3 is connected with a liquid inlet pipe 10, and the gas collection cavity 4 is connected with a gas outlet pipe 11. The refrigerant medium enters the liquid inlet cavity 3 from the liquid inlet pipe 10, flows into the lowermost U-shaped heat exchange pipe unit 5 from the liquid inlet cavity 3, flows along the U-shaped heat exchange pipe unit 5, passes through the return flow cavity 8 and the multiple groups of U-shaped heat exchange pipe units 5, and then flows from the uppermost U-shaped heat exchange pipe unit 5 to the gas collection cavity 4, and is discharged from the gas outlet pipe 11. The liquid inlet pipe 10 is preferably designed as a straight pipe, and the gas outlet pipe 11 is preferably designed as a bent pipe structure.

[0026] The return flow cover 7 is in a plate shape or a box shape. The plate-shaped return flow cover 7 is simple in structure, easy to manufacture and install, and can be provided with a slot hole. The return flow cover 7 and the tube plate 2 can form a return flow cavity 8. The box-shaped return flow cover 7 has a cavity, and the return flow cover 7 and the tube plate 2 form a return flow cavity 8, which ensures that the two adjacent groups of U-shaped heat exchange pipe units 5 are connected and conducted through the corresponding return flow cavities 8, and the refrigerant medium flows smoothly.

[0027] The tube plate 2 is provided with a positioning slot or cavity matched with the return flow cover 7. The positioning slot or cavity can facilitate the accurate installation of the return flow cover 7 on the tube plate 2, improve the installation accuracy and efficiency, and ensure the stability of the overall structure of the heat exchanger.

[0028] The connection between the U-shaped heat exchange pipe 6 and the tube plate 2 is fixed by welding, expansion joint or expansion welding. The welding can ensure the connection strength and good sealing performance. The expansion joint connection process is simple, and the material and labor cost is low. The expansion welding connection can effectively ensure the connection strength and reliability between the U-shaped heat exchange pipe 6 and the tube plate 2 through the double protection of expansion joint and welding, so that the heat exchanger can be applied to more severe environments, and the adaptability and flexibility of the equipment are improved.

[0029] The U-shaped heat exchange pipe 6 is made of stainless steel pipe, copper pipe, copper alloy pipe or titanium alloy pipe. The stainless steel pipe has good corrosion resistance and high strength, which can ensure the service life of the U-shaped heat exchange pipe 6. The copper pipe has good heat conductivity, which can improve the heat exchange efficiency. The 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 U-shaped heat exchange pipe 6 and the tube plate 2. The titanium alloy pipe has high strength and toughness, good corrosion resistance, and light weight, which can be selected according to actual requirements.

[0030] The diameter of the U-shaped heat exchange pipe 6 is 4-16 mm, and the wall thickness of the U-shaped heat exchange pipe 6 is 0.15-2.5 mm. The small pipe diameter of 4-16 mm increases the impact pressure resistance of the U-shaped heat exchange pipe 6 and prolongs the service life. The compact overall structure of the heat exchanger saves materials. The thin wall thickness of 0.15-2.5 mm of the U-shaped heat exchange pipe 6 is beneficial to heat transfer through the pipe wall, achieving higher heat exchange efficiency, improving the performance of the heat exchanger, and reducing the weight of the entire heat exchanger, facilitating the assembly and transportation of the equipment, saving materials, and reducing costs.

[0031] The baffle 12 is arranged in the shell 1 and has an arc-shaped structure or a spiral structure. The arc-shaped baffle 12 is arranged from one end to the other end of the shell 1 and is distributed in two rows. The two rows are staggered and spaced to ensure the flow disturbance of the heat exchange medium and improve the heat transfer efficiency. The spiral baffle 12 extends from one end to the other end of the shell 1, which makes the heat exchange medium flow continuously in the shell 1, reduces the impact on the U-shaped heat exchange pipe unit 5, and ensures the actual heat transfer efficiency.

[0032] The heat exchanger structure in the application is preferably designed as six-tube, eight-tube and ten-tube. The U-shaped heat exchange pipe 6 includes two straight pipes and one bent pipe, i.e., one set of U-shaped heat exchange pipe unit 5 is two-tube, three sets of U-shaped heat exchange pipe units 5 correspond to six-tube, four sets of U-shaped heat exchange pipe units 5 correspond to eight-tube, and five sets of U-shaped heat exchange pipe units 5 correspond to ten-tube. The U-shaped heat exchange pipe 6 in the application is preferably designed as an integral structure. The shell-and-tube heat exchanger structure in the application is suitable for single-system heat exchangers and double-system heat exchangers, which increases the application range of the heat exchanger. When the application is suitable for single-system refrigeration or heating systems, two to four return cover lids 7 are designed in the application corresponding to six-tube, eight-tube and ten-tube. When the application is suitable for double-system refrigeration or heating systems, four to eight return cover lids 7 are designed in the application corresponding to six-tube, eight-tube and ten-tube.

[0033] The above are only specific embodiments of the present application, but the technical features of the present application are not limited thereto. Any simple change, equivalent replacement or modification made on the basis of the present application to solve the basically same technical problem and achieve the basically same technical effect shall be covered in the protection scope of the present application.

Claims

1. A multi-tube-pass shell-and-tube heat exchanger structure comprising a shell and a tube sheet, the tube sheet being arranged at one end of the shell, the tube sheet being provided with a liquid inlet cavity and a gas collection cavity; characterized in that: the shell is provided with at least two groups of U-shaped heat exchange tube units arranged in an up-down manner, each U-shaped heat exchange tube unit being composed of a plurality of U-shaped heat exchange tubes; the tube sheet is provided with a backflow cover, a backflow cavity being formed between the backflow cover and the tube sheet, the backflow cavity being arranged between the liquid inlet cavity and the gas collection cavity, and adjacent two groups of U-shaped heat exchange tube units being connected and communicated through the backflow cavity; the tube sheet is provided with a mounting cover, the liquid inlet cavity and the gas collection cavity being formed between the mounting cover and the tube sheet; the backflow cover is in a plate shape or a box shape; the tube sheet is provided with a positioning groove or cavity matched with the backflow cover; the connection between the U-shaped heat exchange tube and the tube sheet is achieved by welding, expansion or a combination of expansion and welding; the U-shaped heat exchange tube is made of stainless steel, copper, copper alloy or titanium alloy; the diameter of the U-shaped heat exchange tube is 4-16 mm, and the wall thickness of the U-shaped heat exchange tube is 0.15-2.5 mm; the shell is in a circular or rectangular structure; the shell is provided with a baffle in an arcuate or spiral structure; and the shell-and-tube heat exchanger structure is applicable to single-system heat exchangers and double-system heat exchangers.

2. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the backflow cover is in a plate shape.

3. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the backflow cover is in a box shape.

4. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the tube sheet is provided with a positioning groove matched with the backflow cover.

2. A multi-tube pass shell-and-tube heat exchanger structure according to claim 1, characterized in that:

5. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the tube sheet is provided with a positioning cavity matched with the backflow cover.

3. The multi-tube pass shell-and-tube heat exchanger structure according to claim 1, characterized in that:

6. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the connection between the U-shaped heat exchange tube and the tube sheet is achieved by welding.

4. The multi-tube pass shell-and-tube heat exchanger structure according to claim 1, characterized by:

7. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the connection between the U-shaped heat exchange tube and the tube sheet is achieved by expansion.

5. The multi-tube pass shell-and-tube heat exchanger structure according to claim 1, characterized by:

8. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the connection between the U-shaped heat exchange tube and the tube sheet is achieved by a combination of expansion and welding.

6. A multi-tube pass shell-and-tube heat exchanger structure according to claim 1, characterized in that:

9. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the U-shaped heat exchange tube is made of stainless steel.

7. The multi-tube pass shell-and-tube heat exchanger structure according to claim 1, characterized by:

10. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the U-shaped heat exchange tube is made of copper.

8. A multi-tube pass shell-and-tube heat exchanger structure according to claim 1, characterized by:

11. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the U-shaped heat exchange tube is made of copper alloy.

9. A multi-tube pass shell-and-tube heat exchanger structure according to claim 1, characterized in that:

12. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the U-shaped heat exchange tube is made of titanium alloy.

10. The multi-tube pass shell-and-tube heat exchanger structure according to claim 1, characterized in that:

13. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the diameter of the U-shaped heat exchange tube is 4-8 mm.

14. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the diameter of the U-shaped heat exchange tube is 8-12 mm.

15. The multi-tube-pass shell-and-tube heat exchanger structure according to claim 1, wherein the diameter of the U-shaped heat exchange tube is 12-16 mm.

16. The multi-tube

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