Spiral tube heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a spiral tube heat exchanger, which comprises a tank body, two ends of the tank body are respectively provided with a liquid distribution tube box and a conversion tube box, the tank body is communicated with a cooling liquid inlet and a cooling liquid outlet, one end of the cooling liquid inlet extends into the tank body and is communicated with an inner tube, and the other end of the cooling liquid outlet extends into the tank body. An inner pipe is arranged in the tank body, the inner pipe extends to the side deviating from the cooling liquid inlet along the axis of the tank body, a first flow deflector is arranged on the outer side wall of the inner pipe, an outer pipe is arranged in the tank body, the outer pipe is arranged on the inner pipe in a sleeving mode, a second flow deflector is arranged on the outer side wall of the outer pipe, and the first flow deflector and the second flow deflector are both spiral blades. An inner-layer heat exchange tube and an outer-layer heat exchange tube are jointly fixed between the liquid distribution tube box and the conversion tube box, the inner-layer heat exchange tube is wound on the inner tube along the first flow deflector, the outer-layer heat exchange tube is wound on the outer tube along the second flow deflector, the problem that liquid flow dead zones exist on the surfaces of the heat exchange tubes is solved, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, and more specifically, to a spiral tube heat exchanger. Background Art

[0002] The spiral tube heat exchanger is made of one or more groups of spirally wound tubes placed in a shell. It has a compact structure and a larger heat transfer area than a straight tube.

[0003] Chinese utility model patent application number 202420049459.X discloses a double-shell multi-layer spiral tube heat exchanger. By setting a guide tube between the spiral tubes, the flow direction of the coolant is forced to change, thereby improving the contact efficiency between the coolant and the spiral tubes and enhancing the heat exchange effect. However, the coolant flows in the axial direction, making the side wall of the spiral tube a dead zone for liquid flow, and the improvement of the heat exchange effect is limited. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a spiral tube heat exchanger with higher heat exchange efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A spiral tube heat exchanger comprises a tank body, wherein two ends of the tank body are respectively provided with a liquid distribution pipe box and a conversion pipe box, the tank body is connected with a coolant inlet and a coolant outlet, one end of the coolant inlet extends into the tank body and is connected with an inner tube, the inner tube extends along the axis of the tank body toward the side away from the coolant inlet, a guide plate 1 is provided on the outer wall of the inner tube, an outer tube is provided in the tank body, the outer tube is sleeved on the inner tube, a guide plate 2 is provided on the outer wall of the outer tube, the guide plate 1 and the guide plate 2 are both spiral blades, an inner layer heat exchange tube and an outer layer heat exchange tube are fixed between the liquid distribution pipe box and the conversion pipe box, the inner layer heat exchange tube is wrapped around the inner tube along the guide plate 1, and the outer layer heat exchange tube is wrapped around the outer tube along the guide plate 2.

[0007] The utility model is further configured as follows: the end of the inner tube away from the coolant inlet is spaced apart from the end face of the tank body, the outer tube is connected to the end face of the tank body away from the coolant inlet, and the other end of the outer tube is spaced apart from the end face of the corresponding side of the tank body.

[0008] The utility model is further configured as follows: the first guide plate is arranged between the inner tube and the outer tube, and the second guide plate is arranged between the outer tube and the tank body.

[0009] The present invention is further configured as follows: a plurality of retaining rods 1 are evenly arranged on the outside of the inner tube, the retaining rods 1 are arranged in the same direction as the inner tube, the retaining rods 1 penetrate the guide plate 1, and the inner layer heat exchange tubes are wrapped around all the retaining rods 1; a plurality of retaining rods 2 are evenly arranged on the outside of the outer tube, the retaining rods 2 are arranged in the same direction as the outer tube, the retaining rods 2 penetrate the guide plate 2, and the outer layer heat exchange tubes are wrapped around all the retaining rods 2.

[0010] The present invention is further configured as follows: a plurality of limit blocks 1 are fixed on the outer side of the retaining rod 1, and the limit blocks 1 are evenly distributed between the spirals; the inner layer heat exchange tube and the outer layer heat exchange tube both include a plurality of pipe fittings; all the limit blocks 1 between adjacent spirals are staggered with the pipe fittings of the inner layer heat exchange tube; a plurality of limit blocks 2 are fixed on the outer side of the retaining rod 2, and the limit blocks 2 are evenly distributed between the spirals; all the limit blocks 2 between adjacent spirals are staggered with the pipe fittings of the outer layer heat exchange tube.

[0011] The present invention is further configured as follows: a partition is provided in the liquid distribution pipe box, the partition separates the liquid distribution pipe box into a liquid inlet cavity and a liquid outlet cavity, the liquid inlet cavity is provided with a liquid inlet, the liquid outlet cavity is provided with a liquid outlet, the two ends of the outer layer heat exchange tube are respectively tube inlet 2 and tube outlet 2, the tube inlet 2 is connected to the liquid inlet cavity, the tube outlet 2 is connected to the conversion tube box, the two ends of the inner layer heat exchange tube are respectively tube inlet 1 and tube outlet 1, the tube inlet 1 is connected to the conversion tube box, and the tube outlet 1 is connected to the liquid outlet cavity.

[0012] The advantages of the utility model are:

[0013] 1. The tank body, outer tube, and inner tube together form a baffle mechanism, and spiral guide vanes 1 and 2 are respectively provided between the inner tube and the outer tube, and between the outer tube and the tank body. The inner heat exchange tube and the outer heat exchange tube are respectively wound around the inner tube and the outer tube along the guide vanes 1 and 2. When the coolant is in the baffle mechanism, it flows along the guide vanes 1 and 2, that is, the coolant can flow along the heat exchange tubes, eliminating dead zones in the heat exchange tubes and improving heat exchange efficiency.

[0014] 2. After the coolant flows into the tank from the inner tube, it first contacts the inner heat exchange tube, and then contacts the outer heat exchange tube. The cooled liquid enters from the liquid inlet of the liquid distribution box, and then enters the outer heat exchange tube through the pipe inlet 2. After entering the tank for heat exchange, it enters the conversion tube box, and then enters the inner heat exchange tube through the pipe inlet 1, and heat exchange occurs again. Finally, it enters the liquid distribution box and is discharged from the liquid outlet. The coolant and the cooled liquid flow in opposite directions, which reduces the temperature difference between the liquids, balances the heat exchange process, prevents damage to the heat exchanger pipes caused by large temperature changes, and extends the service life of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0016] Figure 2 For the Figure 1 The AA line cross-section shown;

[0017] Figure 3 For the Figure 1 The BB line cross section is shown;

[0018] Figure 4 for Figure 2 An enlarged view of part C is shown;

[0019] In the figure: 1. Tank body; 11. Coolant inlet; 12. Coolant outlet; 2. Liquid distribution pipe box; 21. Liquid inlet; 22. Liquid outlet; 23. Partition; 3. Conversion pipe box; 4. Inner pipe; 41. Guide vane 1; 42. Retaining rod 1; 43. Limit block 1; 5. Outer pipe; 51. Guide vane 2; 52. Retaining rod 2; 53. Limit block 2; 6. Inner heat exchange tube; 61. Tube inlet 1; 62. Tube outlet 1; 7. Outer heat exchange tube; 71. Tube inlet 2; 72. Tube outlet 2. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by one of ordinary skill in the art to which this application relates.

[0022] In the present invention, unless otherwise specified, directions such as "up" and "down" are usually relative to the directions shown in the drawings, or relative to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually relative to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned direction words are not used to limit the present invention.

[0023] See also Figure 1-4 , the utility model provides the following technical solutions:

[0024] A spiral tube heat exchanger includes a tank body 1, with a liquid distribution pipe box 2 and a conversion pipe box 3 respectively provided at both ends of the tank body 1. The tank body 1 is connected to a coolant inlet 11 and a coolant outlet 12. One end of the coolant inlet 11 extends into the tank body 1 and is connected to an inner tube 4. The inner tube 4 extends along the axis of the tank body 1 away from the coolant inlet 11. The end of the inner tube 4 away from the coolant inlet 11 is spaced apart from the end face of the tank body 1.

[0025] An outer tube 5 is provided in the tank body 1. The outer tube 5 is sleeved on the inner tube 4. The outer tube 5 is connected to the end face of the tank body 1 away from the coolant inlet 11. The other end of the outer tube 5 is spaced apart from the end face of the tank body 1 on the corresponding side.

[0026] The coolant enters the inner tube 4 from the coolant inlet 11, and is discharged into the tank body 1 from the inner tube 4, then flows along the inner wall of the outer tube 5 to the other end of the tank body 1, and finally enters the coolant outlet 12 between the outer tube 5 and the tank body 1 and flows out of the heat exchanger. Through the arrangement of the inner tube 4 and the outer tube 5, the flow path of the coolant is increased, the contact time of the coolant and the heat exchange tube is prolonged, and the heat exchange effect is guaranteed.

[0027] A guide plate 1 41 is provided between the inner tube 4 and the outer tube 5, and a guide plate 2 51 is provided between the outer tube 5 and the inner wall of the tank body 1. The guide plate 1 41 and the guide plate 2 51 are both spiral blades, and the coolant flows along the spiral blades when passing therebetween. An inner layer heat exchange tube 6 and an outer layer heat exchange tube 7 are fixed between the liquid distribution pipe box 2 and the conversion pipe box 3. The inner layer heat exchange tube 6 is wrapped around the inner tube 4 along the guide plate 1 41, and the outer layer heat exchange tube 7 is wrapped around the outer tube 5 along the guide plate 2 51. When the coolant passes through the guide plate, it flows along the extension direction of the heat exchange tube, so that there is no dead zone of liquid flow on the surface of the heat exchange tube, thereby improving the heat exchange effect.

[0028] Several retaining rods 42 are evenly arranged on the outside of the inner tube 4. The retaining rods 42 are arranged in the same direction as the inner tube 4. The retaining rods 42 pass through the guide plate 41. The inner heat exchange tube 6 is wrapped around all the retaining rods 42, so that there is a gap between the inner heat exchange tube 6 and the inner tube 4 to allow the coolant to pass through, thereby ensuring the contact area between the coolant and the heat exchange tube;

[0029] A plurality of retaining rods 52 are evenly arranged on the outside of the outer tube 5. The retaining rods 52 are arranged in the same direction as the outer tube 5. The retaining rods 52 pass through the guide plate 51. The outer heat exchange tube 7 is wrapped around all the retaining rods 52 so that there is a gap between the outer heat exchange tube 7 and the outer tube 5 for the coolant to pass through, thereby ensuring the contact area between the coolant and the heat exchange tube.

[0030] A plurality of limit blocks 43 are fixed to the outside of the retaining rod 1 42, and the limit blocks 43 are evenly distributed between the spirals. The inner heat exchange tube 6 and the outer heat exchange tube 7 each include a plurality of pipe fittings. All the limit blocks 43 between adjacent spirals are staggered with the pipe fittings of the inner heat exchange tube 6. A plurality of limit blocks 2 53 are fixed to the outside of the retaining rod 2 52, and the limit blocks 2 53 are evenly distributed between the spirals. All the limit blocks 2 53 between adjacent spirals are staggered with the pipe fittings of the outer heat exchange tube 7. The limit blocks 43 and the limit blocks 2 53 can separate the pipe fittings of the inner heat exchange tube 6 and the outer heat exchange tube 7 respectively, which is convenient for the winding of the pipe fittings and can prevent them from overlapping, thereby ensuring that there are gaps between the pipe fittings, ensuring the contact between the pipe fittings and the coolant, and ensuring the heat exchange efficiency.

[0031] A partition 23 is provided in the liquid distribution pipe box 2, which divides the liquid distribution pipe box 2 into a liquid inlet chamber and a liquid outlet chamber. The liquid inlet chamber is provided with a liquid inlet 21, and the liquid outlet chamber is provided with a liquid outlet 22. The two ends of the outer heat exchange tube 7 are respectively a tube inlet 2 71 and a tube outlet 2 72. The tube inlet 2 71 is connected to the liquid inlet chamber, and the tube outlet 2 72 is connected to the conversion pipe box 3. The two ends of the inner heat exchange tube 6 are respectively a tube inlet 1 61 and a tube outlet 1 62. The tube inlet 1 61 is connected to the conversion pipe box 3, and the tube outlet 1 62 is connected to the liquid outlet chamber.

[0032] The cooled liquid enters the liquid inlet cavity from the liquid inlet 21, then enters the outer heat exchange tube 7 through the second tube inlet 71, and then enters the conversion tube box 3 through the second tube outlet 72. The liquid entering the conversion tube box 3 enters the inner heat exchange tube 6 through the first tube inlet 61, and then enters the liquid outlet cavity through the first tube outlet 62, and finally is discharged through the liquid outlet 22.

[0033] The flow direction of the cooled liquid is opposite to that of the coolant, which reduces the temperature difference between the two liquids in contact with each other, thereby balancing the energy difference of heat exchange of the liquids in the entire heat exchanger, avoiding damage to internal pipes due to excessive temperature difference, and extending the service life of the heat exchanger.

[0034] Specifically, the tank body 1, the outer tube 5, and the inner tube 4 together form a baffle mechanism, and spiral guide vanes 1 41 and 2 51 are respectively provided between the inner tube 4 and the outer tube 5, and between the outer tube 5 and the tank body 1. The inner heat exchange tube 6 and the outer heat exchange tube 7 are respectively wound around the inner tube 4 and the outer tube 5 along the guide vanes 1 41 and 2 51. When the coolant is in the baffle mechanism, it flows along the guide vanes 1 41 and 2 51. That is, the coolant can flow along the heat exchange tubes, so that there is no dead zone of liquid flow in the heat exchange tubes, thereby improving the heat exchange efficiency.

[0035] After the coolant flows into the tank body 1 from the inner tube 4, it first contacts the inner heat exchange tube 6, and then contacts the outer heat exchange tube 7. The cooled liquid enters from the liquid inlet 21 of the liquid distribution box 2, and then enters the outer heat exchange tube 7 through the pipe inlet 2 72. After entering the tank body 1 for heat exchange, it enters the conversion tube box 3, and then enters the inner heat exchange tube 6 through the pipe inlet 1 61, and heat exchange occurs again. Finally, it enters the liquid distribution box 2 and is discharged from the liquid outlet 22. The flow direction of the coolant and the cooled liquid is opposite, which reduces the temperature difference between the liquids, balances the heat exchange process, prevents damage to the heat exchanger pipes caused by large temperature changes, and extends the service life of the heat exchanger.

[0036] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0038] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar pairs of elements and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A spiral tube heat exchanger, comprising a tank body (1), characterized in that: The two ends of the tank body (1) are respectively provided with a liquid distribution pipe box (2) and a conversion pipe box (3); the tank body (1) is connected with a coolant inlet (11) and a coolant outlet (12); one end of the coolant inlet (11) extends into the tank body (1) and is connected with an inner tube (4); the inner tube (4) extends along the axis of the tank body (1) away from the coolant inlet (11); a guide plate (41) is provided on the outer wall of the inner tube (4); an outer tube (5) is provided in the tank body (1) The outer tube (5) is sleeved on the inner tube (4), and a second guide plate (51) is provided on the outer side wall of the outer tube (5). The first guide plate (41) and the second guide plate (51) are both spiral blades. An inner layer heat exchange tube (6) and an outer layer heat exchange tube (7) are fixed between the liquid distribution tube box (2) and the conversion tube box (3). The inner layer heat exchange tube (6) is wound around the inner tube (4) along the first guide plate (41), and the outer layer heat exchange tube (7) is wound around the outer tube (5) along the second guide plate (51).

2. The spiral tube heat exchanger according to claim 1, characterized in that: The end of the inner tube (4) facing away from the coolant inlet (11) is spaced apart from the end face of the tank body (1), the outer tube (5) is connected to the end face of the tank body (1) away from the coolant inlet (11), and the other end of the outer tube (5) is spaced apart from the end face of the corresponding side of the tank body (1).

3. The spiral tube heat exchanger according to claim 2, characterized in that: The first guide plate (41) is arranged between the inner tube (4) and the outer tube (5), and the second guide plate (51) is arranged between the outer tube (5) and the tank body (1).

4. The spiral tube heat exchanger according to claim 3, characterized in that: A plurality of retaining rods (42) are evenly arranged on the outside of the inner tube (4), the retaining rods (42) are arranged in the same direction as the inner tube (4), the retaining rods (42) penetrate the guide plate (41), and the inner layer heat exchange tube (6) is wrapped around all the retaining rods (42). A plurality of retaining rods (52) are evenly arranged on the outside of the outer tube (5), the retaining rods (52) are arranged in the same direction as the outer tube (5), the retaining rods (52) penetrate the guide plate (51), and the outer layer heat exchange tube (7) is wrapped around all the retaining rods (52).

5. The spiral tube heat exchanger according to claim 4, characterized in that: A plurality of limit blocks (43) are fixed on the outside of the retaining rod (42), and the limit blocks (43) are evenly distributed between each spiral. The inner layer heat exchange tube (6) and the outer layer heat exchange tube (7) each include a plurality of pipe fittings. All the limit blocks (43) between adjacent spirals are staggered with the pipe fittings of the inner layer heat exchange tube (6). A plurality of limit blocks (53) are fixed on the outside of the retaining rod (52), and the limit blocks (53) are evenly distributed between each spiral. All the limit blocks (53) between adjacent spirals are staggered with the pipe fittings of the outer layer heat exchange tube (7).

6. The spiral tube heat exchanger according to claim 1, characterized in that: A partition (23) is provided in the liquid distribution pipe box (2), and the partition (23) divides the liquid distribution pipe box (2) into a liquid inlet chamber and a liquid outlet chamber. The liquid inlet chamber is provided with a liquid inlet (21), and the liquid outlet chamber is provided with a liquid outlet (22). The two ends of the outer layer heat exchange tube (7) are respectively a second tube inlet (71) and a second tube outlet (72). The second tube inlet (71) is connected to the liquid inlet chamber, and the second tube outlet (72) is connected to the conversion tube box (3). The two ends of the inner layer heat exchange tube (6) are respectively a first tube inlet (61) and a first tube outlet (62). The first tube inlet (61) is connected to the conversion tube box (3), and the first tube outlet (62) is connected to the liquid outlet chamber.

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