Shell-and-tube heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, in particular to a shell-and-tube heat exchanger which comprises a shell, a first cavity, a second cavity and a third cavity which are separated from one another are formed in the shell, and a heat exchange medium inlet, a heat exchange medium outlet, a fluid inlet and a fluid outlet are formed in the shell. The heat exchange medium inlet is communicated with the first cavity, the heat exchange medium outlet is communicated with the third cavity, and the fluid inlet and the fluid outlet are both communicated with the second cavity; the multiple pipe bundles are arranged in the second cavity and communicate with the first cavity and the third cavity correspondingly; the multiple baffle plates are arranged in the second cavity in an up-down staggered mode, multiple penetrating holes are formed in the baffle plates, and the tube bundles are matched with the penetrating holes and penetrate through the corresponding penetrating holes; the driving assembly is used for driving the baffle plates to slide in the axis direction of the tube bundle. Scale can be automatically cleaned, and therefore it is guaranteed that the heat exchange process is not affected by the scale.

Description

Technical Field

[0001] This application relates to the field of heat exchanger technology, and in particular to a shell-and-tube heat exchanger. Background Technology

[0002] A heat exchanger is a widely used heat exchange device in various industrial and domestic fields. It works by having two fluids flow in a space separated by a wall, exchanging heat through conduction at the wall surface and convection between the fluids. Currently, the most commonly used type of heat exchanger is the shell-and-tube heat exchanger. This type contains several tube bundles, through which a heat exchange medium flows to exchange heat with the fluid outside the tube bundles. However, during prolonged operation, scale easily accumulates on the outer wall of the tube bundles, leading to a decrease in heat exchange efficiency. Utility Model Content

[0003] The purpose of this application is to provide a shell-and-tube heat exchanger that can self-clean up scale, thereby ensuring that the heat exchange process is not affected by scale.

[0004] This application provides a shell-and-tube heat exchanger using the following technical solution:

[0005] A shell-and-tube heat exchanger, comprising:

[0006] The housing contains a first cavity, a second cavity, and a third cavity that are separated from each other. The housing is provided with a heat exchange medium inlet, a heat exchange medium outlet, a fluid inlet, and a fluid outlet. The heat exchange medium inlet is connected to the first cavity, the heat exchange medium outlet is connected to the third cavity, and the fluid inlet and the fluid outlet are both connected to the second cavity.

[0007] A plurality of tube bundles are provided, and the plurality of tube bundles are disposed in the second cavity and respectively communicate with the first cavity and the third cavity;

[0008] A plurality of baffles are provided, and the baffles are arranged alternately in the second cavity. A plurality of perforations are provided on the baffles, and the tube bundle is adapted to the perforations and passes through the corresponding perforations.

[0009] A drive assembly is used to drive several of the baffles to slide along the axis of the tube bundle.

[0010] Optionally, the drive assembly includes a lead screw and a drive member, the lead screw being screwed to a plurality of the baffles, and the drive member being used to drive the lead screw to rotate.

[0011] Optionally, the drive assembly further includes a guide rod, which is fixed inside the housing and passes through and is slidably connected to the baffles.

[0012] Optionally, the drive assembly further includes a recovery pipe and a sealing box, the sealing box being disposed within the second cavity, the recovery pipe being inserted into the second cavity and communicating with the sealing box, the drive component being disposed within the sealing box, and the output end being connected to the lead screw.

[0013] Optionally, the sealed box is provided with an opening, a turntable is rotatably connected inside the opening, the lead screw is fixedly connected to the turntable, and the output end of the drive component is fixedly connected to the turntable.

[0014] Optionally, it also includes a nozzle and a water spray pipe, wherein the nozzle is disposed in the second cavity and is oriented toward the tube bundle, and the water spray pipe is inserted into the second cavity and communicates with the nozzle.

[0015] Optionally, a scraper is also included, which is slidably sleeved on the tube bundle, and the drive assembly can drive the scraper to slide.

[0016] This application utilizes the rotation of a screw to drive several baffles to slide, thereby scraping off scale from the tube bundle. Furthermore, a spray nozzle flushes the tube bundle and baffles, reducing scale residue and ensuring the normal operation of the heat exchange process. The sealed enclosure further minimizes the impact of the liquid environment on the drive components, ensuring their proper functioning. A recovery pipe allows for the recycling and reuse of any heat exchange medium that leaks into the sealed enclosure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a shell-and-tube heat exchanger according to an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the structure after the shell is hidden in the embodiment of this application.

[0019] Figure 3 This application provides a cross-sectional structural diagram of a shell-and-tube heat exchanger according to an embodiment.

[0020] Figure 4 This is a cross-sectional structural diagram of the sealed box according to an embodiment of this application.

[0021] In the figure, 1. Shell; 11. First cavity; 12. Second cavity; 13. Third cavity; 14. Heat exchange medium inlet; 15. Heat exchange medium outlet; 16. Fluid inlet; 17. Fluid outlet; 2. Tube bundle; 3. Baffle plate; 31. Perforation; 4. Drive assembly; 41. Lead screw; 42. Drive component; 43. Recovery pipe; 44. Sealing box; 45. Turntable; 46. Guide rod; 5. Nozzle; 6. Water spray pipe; 7. Scraper. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail below.

[0023] A shell-and-tube heat exchanger, as described above Figure 1 , Figure 2 and Figure 3 The system includes a shell 1, within which are three mutually separated cavities: a first cavity 11, a second cavity 12, and a third cavity 13. The shell 1 is equipped with a heat exchange medium inlet 14, a heat exchange medium outlet 15, a fluid inlet 16, and a fluid outlet 17. The heat exchange medium inlet 14 communicates with the first cavity 11, the heat exchange medium outlet 15 communicates with the third cavity 13, and both the fluid inlet 16 and the fluid outlet 17 communicate with the second cavity 12. A plurality of tube bundles 2 are disposed within the second cavity 12, and the tube bundles 2 communicate with both the first cavity 11 and the third cavity 13. The heat exchange medium flows from the heat exchange medium inlet 14 into the first cavity 11, then through the first cavity 11 into the tube bundles 2, and then through the tube bundles 2 into the third cavity 13, exiting from the heat exchange medium outlet 15. Fluid flows in from fluid inlet 16 and enters the second cavity 12, where it comes into contact with the tube bundle 2 and exchanges heat with the heat exchange medium inside the tube bundle 2. The fluid after heat exchange flows out through fluid outlet 17.

[0024] The second cavity 12 is equipped with several baffles 3, which are arranged alternately in the second cavity 12. Each baffle 3 has several perforations 31, and the tube bundle 2 is adapted to the perforations 31 and passes through the corresponding perforations 31. By setting the baffles 3, the flow velocity of the fluid in the second cavity 12 is slowed down, so that the fluid and the tube bundle 2 can exchange heat fully and ensure the heat exchange effect.

[0025] Furthermore, the shell-and-tube heat exchanger also includes a drive assembly 4, which is used to drive several baffles 3 to slide along the axis of the tube bundle 2. Since the tube bundle 2 and the perforation 31 are matched in size, if scale appears on the tube bundle 2, the scale will be scraped off by the baffles 3 after they slide, thereby reducing the scale residue on the tube bundle 2 and ensuring the normal operation of heat exchange.

[0026] Furthermore, a nozzle 5 is installed on the bottom wall of the second cavity 12, and a water spray pipe 6 is installed on the outside. One end of the water spray pipe 6 is connected to a water source, and the other end of the water spray pipe 6 is inserted into the second cavity 12 and connected to the nozzle 5. The nozzle 5 is positioned facing the tube bundle 2. After the scraper 7 scrapes off the scale, water is sprayed out through the nozzle 5 to wash off the scale adhering to the baffle 3, thereby reducing the scale residue on the baffle 3. In addition, a flow channel can be provided on the housing 1 to allow the wastewater generated during rinsing to flow out through the flow channel, thereby reducing the scale residue inside the housing 1.

[0027] Furthermore, a scraper 7 is fitted onto the tube bundle 2. The scraper 7 is slidably mounted on the tube bundle 2 and is driven by the drive assembly 4. Specifically, since the baffles 3 need to be staggered vertically, each baffle 3 cannot be fitted onto all tube bundles 2. Therefore, scale at the beginning and end of some tube bundles 2 cannot be scraped off by the baffles 3. Thus, scrapers 7 are installed at the beginning and end of these tube bundles 2. By sliding the scraper 7, the scale on these tube bundles 2 is scraped off, further ensuring the normal operation of heat exchange.

[0028] Reference Figure 3 and Figure 4 The drive assembly 4 includes a lead screw 41 and a drive component 42. In this embodiment, the drive component 42 is a drive motor. The lead screw 41 is screwed to several baffles 3. The drive component 42 is used to drive the lead screw 41 to rotate. Through the rotation of the lead screw 41, the several baffles 3 are driven to move back and forth along the axial direction of the tube bundle 2, thereby cleaning the scale on the tube bundle 2.

[0029] The drive assembly 4 is provided in two sets. One set of drive assembly 4 is used to control the sliding of the baffle 3, and the other set of drive assembly 4 is used to control the movement of the scraper 7. The lead screw 41 in the drive assembly 4 that controls the movement of the scraper 7 is slidably connected to the baffle 3.

[0030] Furthermore, the drive assembly 4 also includes a guide rod 46, which is flush with the tube bundle 2 and fixed inside the housing 1. The guide rod 46 passes through several baffles 3 and is slidably connected to several baffles 3. By setting the guide rod 46, the rotation of the baffles 3 is guided, and during the rotation of the lead screw 41, the pressure of the baffles 3 on the tube bundle 2 is reduced, thereby reducing the occurrence of damage to the tube bundle 2.

[0031] Furthermore, the drive assembly 4 also includes a recovery pipe 43 and a sealed box 44. The sealed box 44 is fixed to the housing 1 and located within the second cavity 12. The recovery pipe 43 is inserted into the second cavity 12 and communicates with the sealed box 44. The drive component 42 is disposed within the sealed box 44, and its output end is connected to the lead screw 41. Since the drive component 42 uses a drive motor, which is prone to damage in high-temperature or liquid environments, placing the motor within the sealed box 44 isolates the motor from the heat exchange medium, reducing the likelihood of motor damage. Additionally, the sealed box 44 can be made of a low thermal conductivity material to reduce the temperature inside the sealed box 44.

[0032] Furthermore, the sealing box 44 has an opening, and a turntable 45 is rotatably connected inside the opening. The lead screw 41 is fixedly connected to the turntable 45, and the output end of the drive component 42 is fixedly connected to the turntable 45. If the lead screw is directly inserted into the sealing box 44 and fixed to the drive component 42, there will be a large gap between the lead screw and the sealing box 44 due to the threads on the lead screw, resulting in a large amount of water leakage. In this embodiment, the drive component 42 drives the turntable 45 to rotate, thereby driving the lead screw 41 to rotate. The gap between the turntable 45 and the sealing box 44 is smaller, and the amount of water leakage is smaller. The small amount of water that leaks into the sealing box 44 will be recovered through the recovery pipe 43. Since the amount of water leakage is small, the impact on the drive component 42 is small, ensuring the service life of the drive component 42.

[0033] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A shell-and-tube heat exchanger, characterized in that, include: The shell (1) contains a first cavity (11), a second cavity (12) and a third cavity (13) that are separated from each other. The shell (1) is provided with a heat exchange medium inlet (14), a heat exchange medium outlet (15), a fluid inlet (16) and a fluid outlet (17). The heat exchange medium inlet (14) is connected to the first cavity (11), the heat exchange medium outlet (15) is connected to the third cavity (13), and the fluid inlet (16) and the fluid outlet (17) are both connected to the second cavity (12). A plurality of tube bundles (2) are provided, and the plurality of tube bundles (2) are disposed in the second cavity (12) and are respectively connected to the first cavity (11) and the third cavity (13); A plurality of baffles (3) are provided, and the plurality of baffles (3) are arranged alternately in the second cavity (12). A plurality of perforations (31) are provided on the baffles (3). The tube bundle (2) is adapted to the perforations (31) and passes through the corresponding perforations (31). The drive assembly (4) is used to drive several of the baffles (3) to slide along the axis of the tube bundle (2).

2. A shell-and-tube heat exchanger according to claim 1, characterized in that, The drive assembly (4) includes a lead screw (41) and a drive member (42). The lead screw (41) is screwed to a plurality of the baffles (3), and the drive member (42) is used to drive the lead screw (41) to rotate.

3. A shell-and-tube heat exchanger according to claim 2, characterized in that, The drive assembly (4) further includes a guide rod (46), which is fixed inside the housing (1) and passes through several of the baffles (3) and is slidably connected to several of the baffles (3).

4. A shell-and-tube heat exchanger according to claim 3, characterized in that, The drive assembly (4) further includes a recovery pipe (43) and a sealing box (44). The sealing box (44) is disposed in the second cavity (12). The recovery pipe (43) is inserted into the second cavity (12) and communicates with the sealing box (44). The drive element (42) is disposed in the sealing box (44) and the output end of the drive element (42) is connected to the lead screw (41).

5. A shell-and-tube heat exchanger according to claim 4, characterized in that, The sealed box (44) has an opening, and a turntable (45) is rotatably connected inside the opening. The lead screw (41) is fixedly connected to the turntable (45), and the output end of the drive component (42) is fixedly connected to the turntable (45).

6. A shell-and-tube heat exchanger according to any one of claims 1-5, characterized in that, It also includes a nozzle (5) and a water spray pipe (6), wherein the nozzle (5) is disposed in the second cavity (12) and is disposed in the direction of the tube bundle (2), and the water spray pipe (6) is inserted into the second cavity (12) and communicates with the nozzle (5).

7. A shell-and-tube heat exchanger according to claim 1, characterized in that, It also includes a scraper (7), which is slidably sleeved on the tube bundle (2), and the drive assembly (4) can drive the scraper (7) to slide.

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