Double-spiral heat exchange tube heat exchanger

Abstract

The invention discloses a double-helix heat exchange tube for a heat exchanger and a double-helix heat exchange tube heat exchanger based on the double-helix heat exchange tube. A double-spiral heat exchange tube is created for the first time, and the inherent thermal stress problem of the heat exchanger is fundamentally solved. The creative structure of tube-shell pass communication facilitates cleaning between the inner tubes of the shell pass tube, solves the problem that the heat exchanger is difficult to clean and maintain, and improves the heat exchange efficiency. The double-helix heat exchange tube has the characteristics of a miniature heat exchanger, so that optimal grouping arrangement of the heat exchange tube is conveniently realized, and integrated design and application of a plurality of heat exchangers are realized. And in combination with a chip technology, real-time monitoring and adjustment can be further carried out on work of a single heat exchange tube or a group of heat exchange tubes, global balanced use of the heat exchanger is realized, and the heat exchange efficiency is further improved. The intelligent heat exchanger has practical significance. The double-spiral heat exchange tube heat exchanger integrates the advantages of various heat exchangers, and is simple in structure, convenient to design and manufacture, good in maintainability, wide in adaptive temperature range and convenient to integrate and intellectualize, thereby having wide applicability and economic value.

Description

Technical Field

[0001] The present invention relates to a double - helix heat - exchange tube for a heat exchanger and a double - helix heat - exchange tube heat exchanger relying on such a heat - exchange tube, belonging to the technical field of heat exchangers. Background Art

[0002] Heat exchangers have a wide range of applications in production and life, and their main heat - exchange elements are usually heat - exchange tubes. Common types of heat - exchange tubes include straight tubes, U - shaped tubes or spiral tubes. The two ends of the heat - exchange tube are respectively connected to tube sheets or other components to form a heat exchanger, such as a shell - and - tube heat exchanger, a wound - tube heat exchanger, a spiral - tube heat exchanger, etc.

[0003] For many years, the types of heat - exchange tubes have not changed much. Restricted by the types of heat - exchange tubes, the structures and functions of existing various heat exchangers are difficult to effectively expand. Their shell - side and tube - side are strictly separated, and the inlets and outlets of the heat exchanger are generally arranged at both ends of the heat exchanger along with the two ends of the heat - exchange tube. Even for a U - shaped tube heat exchanger, its shell - side and tube - side are separated by a tube sheet. Functionally, some have a simple structure but are not compact enough, with low heat - exchange efficiency and poor adaptability to thermal stress; some have high heat - exchange efficiency but are prone to blockage and have high requirements for fluid media; some have a compact structure and good adaptability, but are difficult to manufacture, costly, and difficult to maintain. For various spiral - type heat exchangers such as multiple spiral tubes and threaded tubes based on the wound - tube heat exchanger, manufacturing and maintenance are not convenient, and the economy is not optimistic. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above - mentioned deficiencies of the heat exchanger, and provide a double - helix heat - exchange tube and a double - helix heat - exchange tube heat exchanger relying on such a double - helix heat - exchange tube. This double - helix heat - exchange tube heat exchanger combines the advantages of multiple heat exchangers, has a simple structure, is convenient for design and manufacture, has good maintainability, a wide temperature adaptation range, overcomes the problem of thermal stress, is convenient for integration and intelligentization, and thus has wide applicability and economic value.

[0005] The purpose of the present invention is achieved as follows: A double - helix heat - exchange tube, characterized in that it has a DNA - shaped double - helix tube section, the two ports at one end of the double - helix tube section are closed by a closed transition tube section, and the two ports at the other end are respectively led out through two transition tube sections to form the inlets and outlets of the double - helix heat - exchange tube.

[0006] The double - helix heat - exchange tube is used in a group with a straight tube, and the double - helix heat - exchange tube is wound around the straight tube to form a heat - exchange tube group. In some scenarios, a certain number of holes are opened on the straight tube, and the size and number of the holes are determined according to design requirements.

[0007] For the straight tube around which the double - helix heat - exchange tube is wound, in some scenarios, connecting rods, support plates or other forms of connection and support members are provided at its ends or other parts required by design.

[0008] In some embodiments of the present invention, the form of the transition section of the double - helix heat - exchange tube is not fixed and may have other appropriate forms outside the embodiments of the present invention.

[0009] In some embodiments of the present invention, the straight tube around which the double - helix heat - exchange tube is wound may have a relatively large diameter, thereby constituting a high - flux heat exchanger to meet the use in different scenarios.

[0010] In some embodiments of the present invention, the double - helix structure of the double - helix heat - exchange tube can be developed into a multi - helix structure such as a triple - helix or a quadruple - helix to meet the use in different scenarios.

[0011] The double - helix heat - exchange tube heat exchanger constructed based on the double - helix heat - exchange tube described in the present invention is characterized by comprising a shell, a tube box, a double - helix heat - exchange tube, a straight tube, and a connecting support.

[0012] The shell includes an upper cylinder, a shell tube sheet, a lower cylinder, an upper head, a lower head, an upper nozzle, and a lower nozzle; The upper cylinder is connected to the lower cylinder through the shell tube sheet, and the other ends of the two are respectively connected to the upper head and the lower head. The upper head and the lower head are respectively connected to the upper nozzle and the lower nozzle.

[0013] There are two tube boxes, which respectively include tube - box nozzles, tube - box heads, tube - box cylinders, tube - box tube sheets, and short tubes.

[0014] The heat - exchange tube group formed by winding the double - helix heat - exchange tube on the straight tube is axially arranged in the tube - plate holes of the shell tube sheet. In some embodiments of the present invention, a connecting support is provided at the end of the straight tube close to the transition tube section of the closed end of the double - helix heat - exchange tube.

[0015] In some embodiments of the present invention, the double - helix heat - exchange tube heat exchanger can realize the integration and application of multiple heat exchangers by optimizing the grouping and arrangement of the double - helix heat - exchange tubes and matching with the corresponding number of tube boxes, becoming a multi - functional heat exchanger, which provides convenience for production and life. This has special significance in the current trend of large - scale and intensive industrial development of devices.

[0016] In some embodiments of the present invention, the double - helix heat - exchange tube heat exchanger can remove the lower cylinder, the lower head, and the lower nozzle, and thus be used as a component to solve the problems that the structures of existing multiple types of heat exchangers are complex in high - temperature scenarios and are prone to failure due to thermal stress.

[0017] In some embodiments of the present invention, for the double - helix heat - exchange tube heat exchanger described in the present invention, the connections between the shell tube sheet and the upper and lower cylinders, and between the tube - box tube sheet and the tube - box cylinder and the short tube and other parts can be in the form of flanges, welding, or other appropriate forms, so as to facilitate manufacturing and maintenance, and are not limited to the forms of the embodiments of the present invention.

[0018] The double - helix heat - exchange tube heat exchanger, in fact, the double - helix heat - exchange tube itself is a micro heat exchanger, and the double - helix heat - exchange tube heat exchanger is actually a combination of multiple micro heat exchangers. On the basis of optimized grouped arrangement, the temperature control of the heat - exchange tubes at specified positions can be realized. With the help of chip technology, the monitoring and control of each single tube and each group of heat - exchange tubes can be further achieved, realizing the intelligent real - time optimization of the heat exchanger and improving the heat - exchange efficiency.

[0019] In summary, compared with the prior art, the beneficial effects of the present invention are as follows: The double - helix heat - exchange tube is invented for the first time, fundamentally solving the inherent thermal stress problem of the heat exchanger. At the same time, due to the fluctuation of the expansion and contraction amount of the double - helix structure during temperature change, the heat exchanger has a certain degree of self - cleaning function, which is beneficial to the long - term operation of the equipment. The double - helix heat - exchange tube heat exchanger constructed with this double - helix heat - exchange tube has the advantages of various existing spiral heat exchangers, and is simple and convenient to design and manufacture. The creative structure of the shell - side and tube - side connection facilitates the cleaning of the inside and between the tubes of the shell - side, solves the problem of difficult cleaning and maintenance of the heat exchanger, and improves the heat - exchange efficiency. The double - helix heat - exchange tube has the characteristics of a micro heat exchanger, so the integrated design and application of multiple heat exchangers can be realized through the optimized grouped arrangement of the heat - exchange tubes. Combined with chip technology, the operation of single or grouped heat - exchange tubes can be further monitored and adjusted in real time, realizing the balanced use of the entire heat exchanger area, improving the heat - exchange efficiency, and becoming a practical intelligent heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention are shown in the drawings and are described in detail below. Among them, the same reference numerals represent elements with the same or similar functions; the connections between the elements in this example are shown in a welded manner. Among them: Figure 1 is the structural schematic diagram of the double - helix heat - exchange tube heat exchanger constructed with the double - helix heat - exchange tube; Figure 2 is the structural schematic diagram of the double - helix heat - exchange tube; Figure 3 is the structural schematic diagram of the straight tube wound by the double - helix heat - exchange tube; Figure 4 is the structural schematic diagram of the combination of the double - helix heat - exchange tube and the straight tube winding; Figure 5 is Figure 1 the A - A cross - sectional view of Figure 6 is Figure 5 the enlarged schematic diagram of part B in Reference numerals: 1 - Shell: 11 - Upper cylinder, 12 - Shell tube sheet, 13 - Lower cylinder, 14 - Upper head, 15 - Lower head, 16 - Upper nozzle, 17 - Lower nozzle; 2 - Tube box: 21 - Tube box head, 22 - Tube box cylinder, 23 - Tube box tube sheet, 24 - Short tube, 25 - Tube box nozzle; 3 - Tube box: 31 - Tube box head, 32 - Tube box cylinder, 33 - Tube box tube sheet, 34 - Short tube, 35 - Tube box nozzle; 4 - Double - helix heat - exchange tube; 5 - Straight tube, 6 - Connecting and supporting member; Specific implementation mode

[0021] The embodiments of the present invention will be described in detail below. The embodiments are shown in the drawings and are exemplary, aiming to explain the present invention and should not be regarded as or understood as a limitation of the present invention. Any modification to the scope and intention of this application or foreseeable modifications and other equivalent forms of this application should be regarded as having the features described in the claims and falling within the protection scope of the claims of the present invention.

[0022] In the embodiments of the present invention, the same or similar reference numerals are used to represent elements with the same or similar functions to explain the embodiments of the present invention.

[0023] Embodiment: In the embodiments of the present invention, as Figure 1 shown, it is a schematic structural diagram of a double - helix heat - exchange tube heat exchanger constructed with double - helix heat - exchange tubes, including a shell (1), a tube box (2), a tube box (3), double - helix heat - exchange tubes (4), straight tubes (5), and connecting and supporting members (6); The shell (1) includes: an upper cylinder (11), a shell tube sheet (12), a lower cylinder (13), an upper head (14), a lower head (15), an upper nozzle (16), and a lower nozzle (17); The tube box (2) includes: a tube box head (21), a tube box cylinder (22), a tube box tube sheet (23), a short tube (24), and a tube box nozzle (25); The tube box (3) includes: a tube box head (31), a tube box cylinder (32), a tube box tube sheet (33), a short tube (34), and a tube box nozzle (35); The double - helix heat - exchange tube (4) includes: a double - helix tube section (41), a closed - end transition tube section (42), an open - end transition tube section (43), and an open - end transition tube section (44).

[0024] The straight tube (5) has openings.

[0025] The double - helix heat - exchange tube (4) is wound around the straight tube (5) to form a heat - exchange tube group, and both are axially arranged in the tube holes of the shell tube sheet (12).

[0026] In the embodiment of the present invention, a connection support (6) is provided at the end of the straight tube (5).

[0027] In the embodiment of the present invention, the upper cylinder body (11) is connected to the lower cylinder body (13) as a whole through the shell tube sheet (12), and the other ends are respectively connected to the upper head (14) and the lower head (15); the upper pipe opening (16) and the lower pipe opening (17) are respectively connected to the upper head (14) and the lower head (15); the tube - box tube sheets (23) and (33) are respectively connected to the upper cylinder body (11) through the short tubes (24) and (34); the double - helix heat - exchange tube (4) and the straight tube (5) pass through the tube holes on the shell tube sheet (12) and enter the upper cylinder body (11), and the open - end transition sections (43) and (44) of the double - helix heat - exchange tube (4) are respectively connected to the tube - box tube sheets (23) and (33); the tube - box pipe opening (25) is connected to the tube - box head (21), and the tube - box pipe opening (35) is connected to the tube - box head (31), forming a double - helix heat - exchange tube heat exchanger. When necessary, a connection support (6) is provided at the end of the straight tube (5) near the lower head (15) for support, and the form is determined according to the specific structure. During operation, one medium flows in from the tube - box pipe opening (25), passes through the double - helix heat - exchange tube (4), and flows out from the tube - box pipe opening (35), and vice versa. It completes heat exchange with another medium that flows in from the lower pipe opening (17), passes through the straight tube (5) and the openings thereon, and flows out from the upper pipe opening (16).

[0028] As can be seen from this embodiment, the double - helix heat - exchange tube heat exchanger described in the present invention is almost as simple as the widely used shell - and - tube heat exchanger, which is convenient for design and manufacture. However, due to the adoption of the double - helix heat - exchange tube, it overcomes the disadvantages of low heat - exchange efficiency and poor thermal adaptability, and has the advantages of the wound - tube heat exchanger and various spiral - tube heat exchangers. At the same time, since the straight tube enters the tube - side space, the connection between the tube - side and the shell - side is realized, so that it is convenient to clean and maintain the shell - side in the tube - side. Therefore, it has practicality and economy.

[0029] The above is only an example in the embodiments of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the intention and principle of the present invention are within the protection scope of the present invention.

Claims

1. A double-helix heat exchange tube heat exchanger, characterized in that: include: Housing (1) The shell (1) comprises an upper cylinder (11), a shell tube sheet (12), a lower cylinder (13), an upper head (14), a lower head (15), an upper pipe opening (16), and a lower pipe opening (17); The upper cylinder (11) and the lower cylinder (13) are connected via a shell tube sheet (12), and the other ends are respectively connected to an upper end cap (14) and a lower end cap (15), and the upper end cap (14) and the lower end cap (15) are respectively connected to an upper pipe opening (16) and a lower pipe opening (17).

2. The double spiral heat exchanger according to claim 1, characterized in that: It also includes: a pipe box (2), a pipe box (3); The pipe box (2) comprises a pipe box head (21), a pipe box cylinder (22), a pipe box tube sheet (23), a short tube (24), and a pipe box pipe port (25); The pipe box pipe port (25), the pipe box head (21), the pipe box cylinder (22), the pipe box tube sheet (23), and the short pipe (24) are connected in sequence, and the other end of the short pipe (24) is connected to the upper cylinder (11); The pipe box (3) comprises a pipe box head (31), a pipe box cylinder (32), a pipe box tube sheet (33), a short tube (34), and a pipe box pipe port (35); The pipe box pipe port (35), the pipe box head (31), the pipe box cylinder (32), the pipe box tube plate (33), and the short pipe (34) are connected in sequence, and the other end of the short pipe (34) is connected to the upper cylinder (11).

3. The double-helix heat exchanger according to claim 1, characterized in that: It also includes: a double-helix heat exchange tube (4), a straight tube (5), and a connecting support (6); The double-helix heat exchange tube (4) comprises: a double-helix tube section (41), a closed-end transition tube section (42), an open-end transition tube section (43) and an open-end transition tube section (44); One end of the double helix tube section (41) is connected and closed by the closed end transition tube section (42), and the other end is led out by the open end transition tube section (43) and the open end transition tube section (44), and connected to the tube box tube sheet (23) and the tube box tube sheet (33) respectively. The double helix section (41) has a DNA-like double helix structure; The straight tube (5) has an opening; The double-helix heat exchange tube (4) is wound around the straight tube (5) to form a heat exchange tube group, and both are arranged axially in the tube sheet hole of the shell tube sheet (12); The end of the straight pipe (5) close to the closed-end transition pipe section (42) is provided with a connecting support (6).

Images