Double-pipe heat exchanger

Abstract

The utility model discloses a double-pipe heat exchanger which comprises a plurality of refrigerant sleeves which are sequentially communicated, and the refrigerant sleeves are sequentially communicated through U-shaped sleeves. The double-pipe heat exchanger further comprises a heat exchange core pipe mechanism, the heat exchange core pipe mechanism comprises I-type heat exchange units located in the refrigerant sleeves respectively, each I-type heat exchange unit comprises a heat exchange core pipe structure, each heat exchange core pipe structure comprises liquid flow bases arranged at the two ends respectively, and a plurality of twisted heat exchange core pipes are communicated between the liquid flow bases. The heat exchange core pipe mechanism further comprises a plurality of II-type heat exchange units, the II-type heat exchange units are used for communicating the adjacent I-type heat exchange units in series, and each II-type heat exchange unit comprises a U-shaped heat exchange pipe communicating between the liquid flow bases. The U-shaped heat exchange pipe is positioned in the U-shaped sleeve; a plurality of heat exchange fins are fixedly connected to the U-shaped heat exchange pipe. According to the mode, high-temperature media and media with the high flow speed are rapidly cooled, and the equipment working requirement is met.

Description

Technical Field

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

[0002] A heat exchanger is a device that recycles heat energy. Specifically, it cools down the high-temperature medium during operation by exchanging heat. Once cooled, the high-temperature medium can be recycled back into the process to continue cooling the equipment. Heat exchangers have a wide range of industrial applications, and are often used in heat pump units, for example.

[0003] The shell-and-tube heat exchanger is widely used in industry due to its simple structure, low cost, and high heat exchange efficiency. The main structure of a shell-and-tube heat exchanger consists of an outer shell and an inner heat exchange core tube installed within the outer shell. During operation, the high-temperature medium passes through the inner heat exchange core tube and exchanges heat with the low-temperature refrigerant in the outer shell, which cools it down.

[0004] However, existing double-tube heat exchangers experience a gradual decline in heat exchange efficiency when dealing with high-temperature media with high flow rates and long cooling times. Specifically, because the inner heat exchange core tubes are mostly straight, high-temperature media cannot be cooled quickly, especially when passing through them at high speeds.

[0005] At the same time, since the high-temperature medium flows through each copper tube in a split flow, the cooling rate after passing through each copper tube is different. The specific reason is that the scaling conditions of different copper tubes are different. The natural cooling effect is poor for copper tubes with severe scaling, while the cooling efficiency is slightly higher for those with severe scaling. This leads to scaling in the core tube, which affects the heat exchange efficiency.

[0006] Especially when rapid cooling is required, the existing shell and tube heat exchanger cannot achieve rapid cooling at all. Utility Model Content

[0007] Based on the above background, the purpose of the present invention is to provide a shell and tube heat exchanger.

[0008] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0009] A double-tube heat exchanger comprises a plurality of refrigerant tubes connected in sequence, wherein the refrigerant tubes are connected in sequence through U-shaped tubes;

[0010] The shell and tube heat exchanger further includes a heat exchange core tube mechanism, the heat exchange core tube mechanism includes a type I heat exchange unit respectively located in the refrigerant shell, the type I heat exchange unit includes a heat exchange core tube structure, the heat exchange core tube structure includes a liquid flow seat respectively provided at both ends, and a plurality of twisted heat exchange core tubes are connected between the liquid flow seats;

[0011] The heat exchange core tube mechanism also includes a plurality of type II heat exchange units, and the fluid is divided in the type I heat exchange unit and then merged through the type II heat exchange unit;

[0012] The type II heat exchange unit is used to connect adjacent type I heat exchange units in series, and the type II heat exchange unit includes a U-shaped heat exchange tube connected between the liquid flow seats; the U-shaped heat exchange tube is located in the U-shaped sleeve;

[0013] A plurality of heat exchange fins are fixedly connected to the U-shaped heat exchange tube.

[0014] Preferably, the top of the refrigerant sleeve located at the liquid inlet position is connected to a refrigerant inlet pipe, and the top of the refrigerant sleeve located at the liquid outlet position is connected to a heat medium outlet pipe.

[0015] Preferably, the type I heat exchange unit at the liquid inlet end is connected to a heat inlet pipe, and the type I heat exchange unit at the liquid outlet end is connected to a cold outlet pipe;

[0016] The heat inlet pipe and the cold outlet pipe are respectively connected to the liquid flow seats at corresponding positions.

[0017] Preferably, a pipe sleeve adapted to the heat inlet pipe and the cold outlet pipe is fixedly connected to the refrigerant sleeve, and the heat inlet pipe and the cold outlet pipe pass through the pipe sleeves at corresponding positions;

[0018] The heat inlet pipe, the cold outlet pipe and the pipe sleeve are sealed.

[0019] Preferably, the shape of the twisted heat exchange core tube is spiral;

[0020] The twisted heat exchange core tubes are circumferentially distributed between the liquid flow seats;

[0021] The twisted heat exchange core tubes are arranged at intervals.

[0022] Preferably, the material of the twisted heat exchange core tube is copper;

[0023] The U-shaped heat exchange tube is made of copper.

[0024] Preferably, the heat exchange fin is in the shape of a ring;

[0025] The heat exchange fins are seal-welded on the U-shaped heat exchange tubes.

[0026] Preferably, the inner end of the heat exchange fin is located in the tube cavity of the U-shaped heat exchange tube;

[0027] The annular core of the heat exchange fin forms a fluid channel.

[0028] Preferably, a plurality of annular baffles are welded on the inner wall of the tube cavity of the refrigerant sleeve.

[0029] The utility model has the following beneficial effects:

[0030] 1. A first-stage heat exchange mechanism is formed by a refrigerant jacket-Type I heat exchange unit, and multiple refrigerant jacket-Type I heat exchange units connected in series form a multi-stage heat exchange mechanism. In this way, high-temperature media and fast-flowing media can be quickly cooled to meet the working needs of the equipment.

[0031] 2. Under the split flow state, heat exchange is achieved within the independent twist heat exchange core tubes. At the same time, the twist heat exchange core tubes increase the medium's passage time. Therefore, per unit time, a specific volume of high-temperature medium not only greatly increases the total length of the path it passes through, but also greatly increases the heat exchange area (the total wall area of ​​the independent twist heat exchange core tubes is used as a reference), thereby greatly improving the heat exchange effect.

[0032] 3. Through the Class II heat exchange unit, the problem of scaling of the twisted heat exchange core tube is solved, and the scaling degree is different, which leads to different heat exchange amplitudes of high-temperature media independently in the twisted heat exchange core tube, resulting in unstable heat exchange. The media in the twisted heat exchange core tube are merged. During the merging process, heat exchange is carried out between media of different temperatures and sizes, and heat exchange continues from the next level of heat exchange structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0034] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0035] Figure 2 This is a schematic structural diagram of a Type I heat exchange unit in an embodiment of the present utility model;

[0036] Figure 3 This is a schematic diagram of the dispersed structure of the Type II heat exchange unit in the embodiment of the present utility model;

[0037] Figure 4 This is a schematic diagram of the dispersed structure of the refrigerant casing in the embodiment of the present utility model;

[0038] Figure 5 For the embodiment of the utility model Figure 2 A structural diagram from another perspective.

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, in this utility model, the descriptions of "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0043] Example 1

[0044] like Figure 1-5 As shown, a shell and tube heat exchanger includes a plurality of refrigerant shells 1 connected in sequence, and the refrigerant shells 1 are connected in sequence through U-shaped shells 13.

[0045] The double-tube heat exchanger also includes a heat exchange core tube mechanism, which includes Class I heat exchange units 2, each located within the refrigerant casing 1. Thus, the refrigerant casing 1 and Class I heat exchange units 2 form a single-stage heat exchange mechanism, while multiple refrigerant casings 1 and Class I heat exchange units 2 connected in series form a multi-stage heat exchange mechanism. This allows for rapid cooling of high-temperature and fast-flowing media, meeting the operational requirements of the equipment.

[0046] The Class I heat exchange unit 2 includes a heat exchange core tube structure, which includes liquid flow seats 22 arranged at both ends (the liquid flow seats 22 are made of stainless steel, and there is sufficient gap between the liquid flow seats 22 and the refrigerant sleeve 1 to meet the needs of fluid passage). A number of twisted heat exchange core tubes 23 (made of copper and spiral in shape) are connected between the liquid flow seats 22. Specifically, the twisted heat exchange core tubes 23 are distributed circumferentially between the liquid flow seats 22; the twisted heat exchange core tubes 23 are arranged at intervals.

[0047] The advantage of this method is that, in the split flow state, heat exchange is achieved within the independent twisted heat exchange core tubes 23. At the same time, the twisted heat exchange core tubes 23 increase the medium's passage time. Therefore, per unit time, a given volume of high-temperature medium not only significantly increases the total length of the path it passes through, but also significantly increases the heat exchange area (using the total wall area of ​​the independent twisted heat exchange core tubes 23 as a reference), thereby significantly enhancing the heat exchange effect.

[0048] Example 2

[0049] like Figure 1-5 As shown, this embodiment is based on the structure of embodiment 1. In order to solve the problem that the heat exchange amplitude of the high-temperature medium independently in the twisted heat exchange core tube 23 is different after the scaling of the twisted heat exchange core tube 23, and the scaling degree is different, resulting in unstable heat exchange, the media diverted in the twisted heat exchange core tube 23 are merged. During the merging process, heat exchange is carried out between media of different temperatures and sizes, and heat exchange continues from the next level of heat exchange structure.

[0050] Specifically, the heat exchange core tube mechanism further includes a plurality of type II heat exchange units 24 . After the fluid is split in the type I heat exchange unit 2 , it is merged through the type II heat exchange unit 24 .

[0051] Specifically, the Class II heat exchange unit 24 is used to connect adjacent Class I heat exchange units 2 in series. The Class II heat exchange unit 24 includes a U-shaped heat exchange tube 241 (made of copper) that connects between the liquid flow seats 22. The U-shaped heat exchange tube 241 is located within the U-shaped sleeve 13. A plurality of heat exchange fins 242 are fixedly connected to the U-shaped heat exchange tube 241. The heat exchange fins 242 are preferably made of copper.

[0052] Specifically, the heat exchange fin 242 is annular in shape; the heat exchange fin 242 is seal-welded to the U-shaped heat exchange tube 241 .

[0053] At the same time, the inner end of the heat exchange fin 242 is located in the tube cavity of the U-shaped heat exchange tube 241; the center of the heat exchange fin 242 forms a fluid channel 243.

[0054] In the above structure, because the inner ends of heat exchange fins 242 are directly in contact with the high-temperature medium and the outer ends are directly immersed in the low-temperature medium, this approach has the advantage of further improving heat exchange efficiency. Furthermore, because the inner ends of heat exchange fins 242 are located within the lumen of U-shaped heat exchange tube 241, flow obstruction is created, allowing the high-temperature medium converging within U-shaped heat exchange tube 241 to undergo further heat exchange, resulting in a uniform temperature medium.

[0055] Example 3

[0056] like Figure 1-5 As shown, based on the structure of Example 2, the top of the refrigerant sleeve 1 located at the liquid inlet position (i.e., the left end) is connected to the refrigerant inlet pipe 12, and the top of the refrigerant sleeve 1 located at the liquid outlet position (i.e., the right end) is connected to the heat medium outlet pipe.

[0057] The type I heat exchange unit 2 at the liquid inlet end (i.e. the left end) is connected to a heat inlet pipe 21, and the type I heat exchange unit 2 at the liquid outlet end (i.e. the right end) is connected to a cold outlet pipe.

[0058] At the same time, the heat inlet pipe 21 and the cold outlet pipe are respectively connected to the liquid flow seats 22 at corresponding positions.

[0059] The refrigerant sleeve 1 is fixedly connected to a sleeve 11 adapted to the heat inlet pipe and the cold outlet pipe. The heat inlet pipe 21 and the cold outlet pipe pass through the sleeve 11 at corresponding positions. The heat inlet pipe, the cold outlet pipe and the sleeve 11 are sealed.

[0060] Example 4

[0061] like Figure 1-5 As shown, this embodiment builds on the structure of Example 3. To increase the heat exchange time between the refrigerant and the core tube and improve energy utilization efficiency, several annular baffles 3 are welded to the inner wall of the tube cavity of the refrigerant sleeve 1. The annular baffles 3 block the flow of the low-temperature medium, reducing the time per unit volume of the low-temperature medium passing through the refrigerant sleeve 1, thereby increasing the heat exchange time, thereby increasing the heat exchange efficiency and achieving energy conservation.

[0062] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A double-tube heat exchanger, characterized in that: It includes a plurality of refrigerant sleeves connected in sequence, wherein the refrigerant sleeves are connected in sequence through U-shaped sleeves; The shell and tube heat exchanger further includes a heat exchange core tube mechanism, the heat exchange core tube mechanism includes a type I heat exchange unit respectively located in the refrigerant shell, the type I heat exchange unit includes a heat exchange core tube structure, the heat exchange core tube structure includes a liquid flow seat respectively provided at both ends, and a plurality of twisted heat exchange core tubes are connected between the liquid flow seats; The heat exchange core tube mechanism also includes a plurality of type II heat exchange units, and the fluid is divided in the type I heat exchange unit and then merged through the type II heat exchange unit; The type II heat exchange unit is used to connect adjacent type I heat exchange units in series, and the type II heat exchange unit includes a U-shaped heat exchange tube connected between the liquid flow seats; the U-shaped heat exchange tube is located in the U-shaped sleeve; A plurality of heat exchange fins are fixedly connected to the U-shaped heat exchange tube.

2. The double-tube heat exchanger according to claim 1, characterized in that: The top of the refrigerant sleeve located at the liquid inlet position is connected to a refrigerant inlet pipe, and the top of the refrigerant sleeve located at the liquid outlet position is connected to a heat medium outlet pipe.

3. The double-tube heat exchanger according to claim 1, characterized in that: The type I heat exchange unit located at the liquid inlet end is connected to a heat inlet pipe, and the type I heat exchange unit located at the liquid outlet end is connected to a cold outlet pipe; The heat inlet pipe and the cold outlet pipe are respectively connected to the liquid flow seats at corresponding positions.

4. The double-tube heat exchanger according to claim 3, characterized in that: The refrigerant sleeve is fixedly connected to a pipe sleeve adapted to the heat inlet pipe and the cold outlet pipe, and the heat inlet pipe and the cold outlet pipe pass through the pipe sleeves at corresponding positions; The heat inlet pipe, the cold outlet pipe and the pipe sleeve are sealed.

5. The double-tube heat exchanger according to claim 1, characterized in that: The shape of the twisted heat exchange core tube is spiral; The twisted heat exchange core tubes are circumferentially distributed between the liquid flow seats; The twisted heat exchange core tubes are arranged at intervals.

6. The double-tube heat exchanger according to claim 1, characterized in that The material of the twisted heat exchange core tube is copper; The U-shaped heat exchange tube is made of copper.

7. The double-tube heat exchanger according to claim 1, characterized in that: The heat exchange fins are in the shape of a ring; The heat exchange fins are seal-welded on the U-shaped heat exchange tubes.

8. The double-tube heat exchanger according to claim 7, characterized in that: The inner end of the heat exchange fin is located in the tube cavity of the U-shaped heat exchange tube; The annular core of the heat exchange fin forms a fluid channel.

9. The double-tube heat exchanger according to claim 1, characterized in that: A plurality of annular baffles are welded on the inner wall of the tube cavity of the refrigerant sleeve.

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