Tube bundle drying machine
Through the intermediate plate support structure and improved connection method, the deformation and breaking of the heat exchange pipe is solved, the stability and service life of the tube bundle dryer are improved, and energy consumption is reduced.
Patent Information
- Application Number
- CN202422429739.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-09
AI Technical Summary
The heat exchange pipes of existing tube bundle dryers are prone to deformation, leakage, and fracture, and temperature difference and stress imbalance caused by uneven heat exchange, which affects the safety and service life of the equipment.
The intermediate plate support structure is adopted, the intermediate heat exchange pipe and the fixed pipe plate are connected with strength expansion and floating, the outer heat exchange pipe and the fixed pipe plate are connected with strength expansion, and the torque is balanced through the central shaft tube, combined with the L-shaped plate and a stable connecting seat to improve the connection reliability and stability.
Effectively avoid sagging in the middle of the heat exchange pipe, reduce alternating stress, reduce the risk of fracture, improve the structural stability and service life of the equipment, and reduce energy consumption.
Smart Images
Figure CN223165906U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of food processing equipment, in particular to a tube bundle dryer. Background Art
[0002] A tube bundle dryer is a type of drying equipment used to reduce the moisture content of materials. Currently, tube bundle dryers primarily use superheated steam as the medium. The material is fed between the dryer housing (which has built-in feed and discharge ports, as well as a dehumidification port on the top) and the heat exchange tubes within the housing. Steam is then introduced into the tubes, which are then rotated by an external drive mechanism. The material enters the tubes, completing the heat exchange process. During this process, the generated moisture is discharged through the dehumidification port on the top of the housing by an induced draft fan.
[0003] Heat exchange tubes are crucial components of tube bundle dryers. Due to their inherent thermal conductivity, they are often constructed with thinner walls and smaller diameters. After a period of use, these tubes are prone to deformation, leakage, and fracture, compromising normal operation and making maintenance and inspection cumbersome. Failure to promptly repair or replace them can lead to safety accidents. This is primarily due to the horizontal placement of the heat exchange tubes, which have low rigidity. Due to gravity, the tubes sag slightly in the middle. During the continuous rotation and heat exchange process, the alternating stresses can cause fatigue damage or even fracture. To address this issue, a central plate is typically installed in the middle of the heat exchange tubes, with a connecting plate located below the transfer plate. The central plate and connecting plate are removably bolted together to provide support. However, the reliable connection is significantly impacted during the material transfer process. The long-term impact of the material can cause the connecting plate to deform, compromising the verticality of the central plate and potentially leading to deformation or even fracture of the heat exchange tubes. Another factor is uneven contact between the heat exchange tubes and the material. Because the outer heat exchange tubes are closer to the tubesheet, they have a higher chance of contact with the material, resulting in faster heat transfer and lower tube temperatures. The heat exchange tubes near the center have less contact with the material, resulting in less heat transfer and higher tube temperatures. This results in a significant temperature difference between the inner and outer heat exchange tubes (up to 30°C). This uneven heat exchange between the inner and outer tubes leads to uneven thermal expansion, which in turn creates uneven stress on the fixed tubesheet. The inner heat exchange tubes experience greater pressure from the fixed tubesheets at both ends, potentially causing breakage. Utility Model Content
[0004] The purpose of the utility model is to provide a tube bundle dryer to solve the problems existing in the prior art.
[0005] The object of the present utility model is achieved as follows: A tube bundle dryer includes a housing, in which heat exchange tubes are horizontally arranged. Both ends of the heat exchange tubes are installed on fixed tube sheets. A head is provided outside the fixed tube sheets. A steam hollow shaft passes through the head and is connected to the fixed tube sheet. A platen is annularly arranged around the outer periphery of the heat exchange tubes. Both ends of the platen are connected to the outer edge of the fixed tube sheet. Connecting seats are arranged at intervals inside the platen. Intermediate perforated plates are arranged at intervals between the fixed tube sheets. The edge of the intermediate perforated plate is inserted into the connecting seat. The heat exchange tubes include intermediate heat exchange tubes and outer heat exchange tubes. Both ends of the outer heat exchange tubes are joined with the fixed tube sheet by strength expansion joint. One end of the intermediate heat exchange tube is joined with the fixed tube sheet by strength expansion joint, and the other end is floatingly connected with the fixed tube sheet. The aperture of the intermediate heat exchange tube is smaller than that of the outer heat exchange tube.
[0006] In the tube bundle dryer of the present utility model, by arranging the intermediate perforated plate, it plays a supporting role for the heat exchange tubes, effectively avoiding the sagging of the middle part of the heat exchange tubes, thereby reducing the alternating stress suffered by the heat exchange tubes during rotation. And through the improvement of the installation structure of the intermediate perforated plate, the reliability and stability of the connection are improved, avoiding the deformation and even fracture of the heat exchange tubes. At the same time, by appropriately reducing the diameter of the intermediate heat exchange tube and the connection method, the risk of fracture of the heat exchange tubes caused by uneven thermal expansion due to uneven heat exchange between the inner and outer heat exchange tubes is reduced. The tube bundle dryer of the present utility model has the advantages of simple structure, convenient maintenance and long service life.
[0007] As a further improvement of the present utility model, the platen is L-shaped. The connecting seat includes a connecting plate, a positioning plate and a limiting plate. The connecting plate is detachably connected to the bottom surface of the platen. The positioning plate is perpendicularly welded to the connecting plate and the top edge of the positioning plate protrudes above the upper surface of the connecting plate. A notch extending to the bottom edge of the positioning plate is provided in the middle of the positioning plate. The limiting plates are perpendicularly welded on both sides of the notch and the upper edges are welded and fixed to the connecting plate. The edge of the intermediate perforated plate is in interference fit with the notch, with strong structural stability, convenient connection and easy maintenance.
[0008] As a further improvement of the present utility model, the length of the notch is slightly smaller than the length of the limiting plate, further improving the structural stability of the connecting seat.
[0009] As a further improvement of the present utility model, a central shaft tube is connected at the central position between the fixed tube sheets. Both ends of the central shaft tube are floatingly connected to the fixed tube sheets. A through hole for the central shaft tube to pass through is provided in the center of the intermediate perforated plate. The central shaft tube is in interference fit with the through hole. By arranging the central shaft tube, the torque during the operation of the equipment mainly acts on the central shaft tube, effectively balancing the torque suffered by the heat exchange tubes during rotation and reducing the possibility of the heat exchange tubes being bent and twisted and fractured.
[0010] As a further improvement of the present utility model, a stepped notch is provided outside the edge of the fixed tube sheet. A platen fixing plate is welded to the outer edge of the fixed tube sheet. The length of the platen fixing plate is greater than the thickness of the fixed tube sheet, which is convenient for connection.
[0011] As a further improvement of the utility model, the housing comprises an upper housing and a lower housing, and an L-shaped flange edge is arranged at the docking position of the upper housing and the lower housing, which is convenient and reliable for connection and easy to manufacture.
[0012] As a further improvement of the utility model, a feeding auger is connected to the front side of the housing, and a discharging auger is connected to the rear end. The steam hollow shaft located on the front side of the housing is connected to a driving mechanism. A moisture discharge port is arranged at the top of the housing, and observation windows are evenly distributed along the length direction of the housing, which improves the operation efficiency and operation safety of the equipment. Description of the Drawings
[0013] Figure 1 It is a schematic diagram of the tube bundle dryer of the utility model.
[0014] Figure 2 It is a schematic diagram of the connecting seat of the tube bundle dryer of the utility model.
[0015] Figure 3 It is a schematic diagram of the positioning plate of the connecting seat of the tube bundle dryer of the utility model.
[0016] Figure 4 It is a schematic diagram of the connecting plate of the connecting seat of the tube bundle dryer of the utility model.
[0017] Figure 5 It is a schematic diagram of the connection between the connecting seat and the baffle of the tube bundle dryer of the utility model.
[0018] Figure 6 It is a schematic diagram of the fixed tube sheet of the tube bundle dryer of the utility model.
[0019] Figure 7 It is a schematic diagram of the intermediate flower plate of the tube bundle dryer of the utility model.
[0020] Among them, 1 is the housing, 2 is the heat exchange tube, 2A is the intermediate heat exchange tube, 2B is the outer heat exchange tube, 3 is the fixed tube sheet, 3A is the stepped notch, 3B is the baffle fixing plate, 4 is the head, 5 is the steam hollow shaft, 6 is the baffle, 7 is the connecting seat, 7A is the connecting plate, 7B is the positioning plate, 7C is the limiting plate, 8 is the intermediate flower plate, 9 is the L-shaped flange edge, 10 is the moisture discharge port, and 11 is the observation window. Detailed Embodiment
[0021] As Figure 1-7 The shown tube bundle dryer comprises a housing 1. A heat exchange tube 2 is horizontally arranged inside the housing 1. Both ends of the heat exchange tube 2 are installed on a fixed tube sheet 3. A head 4 is arranged outside the fixed tube sheet 3. A steam hollow shaft 5 passes through the head 4 and is connected to the fixed tube sheet 3. Baffles 6 are annularly arranged on the outer periphery of the heat exchange tube 2. Both ends of the baffle 6 are connected to the outer edge of the fixed tube sheet 3.
[0022] There are connecting seats 7 arranged at intervals inside the copying plate 6, and an intermediate baffle plate 8 is arranged at intervals between the fixed tube sheets 3. The edge of the intermediate baffle plate 8 is inserted into the connecting seat 7. Specifically, the copying plate 6 is L-shaped. The connecting seat 7 includes a connecting plate 7A, a positioning plate 7B, and a limiting plate 7C. The connecting plate 7A is detachably connected to the bottom surface of the copying plate 6. The positioning plate 7B is perpendicularly welded to the connecting plate 7A, and the top edge of the positioning plate 7B protrudes above the upper surface of the connecting plate 7A. There is a notch extending to the bottom edge of the positioning plate 7B in the middle of the positioning plate 7B. The limiting plate 7C is perpendicularly welded on both sides of the notch, and the upper edge is welded and fixed to the connecting plate 7A. The edge of the intermediate baffle plate 8 is in interference fit with the notch, with strong structural stability, convenient connection, and easy maintenance. The length L1 of the notch is slightly smaller than the length L2 of the limiting plate 7C, further improving the structural stability of the connecting seat 7.
[0023] As Figure 7 shown, the heat exchange tubes 2 include intermediate heat exchange tubes 2A ( Figure 7 the heat exchange tubes located inside the dotted line in Figure 7 ), and outer heat exchange tubes 2B (
[0024] the heat exchange tubes located outside the dotted line in Figure 6 ). Both ends of the outer heat exchange tubes 2B are connected to the fixed tube sheets 3 by strength expansion joints. One end of the intermediate heat exchange tubes 2A is connected to the fixed tube sheet 3 by strength expansion joints, and the other end is connected to the fixed tube sheet 3 by a floating connection, avoiding the fracture of the intermediate heat exchange tubes 2A caused by uneven heat exchange and unbalanced thermal expansion between the inner and outer heat exchange tubes. The aperture of the intermediate heat exchange tubes 2A is slightly smaller than that of the outer heat exchange tubes 2B, further reducing the temperature difference between the inner and outer heat exchange tubes and preventing heat waste and saving energy consumption. In this embodiment, the diameter of the intermediate heat exchange tubes 2A is 51.7 mm, and the diameter of the outer heat exchange tubes 2B is 60 mm.
[0024] As Figure 6 shown, there is a stepped notch 3A on the outer side of the edge of the fixed tube sheet 3, and a copying plate fixing plate 3B is welded to the outer edge of the fixed tube sheet 3. The length of the copying plate fixing plate 3B is greater than the thickness of the fixed tube sheet 3, which is convenient for connection.
[0025] In order to further reduce the possibility of heat exchange tube fracture, a central shaft tube (not shown in the figure) can also be arranged at the center position between the fixed tube sheets 3. Both ends of the central shaft tube are connected to the fixed tube sheets 3 by floating connections. There is a through hole for the central shaft tube to pass through in the center of the intermediate baffle plate 8, and the central shaft tube is in interference fit with the through hole. By arranging the central shaft tube, the torque during the operation of the equipment mainly acts on the central shaft tube, effectively balancing the torque received by the heat exchange tubes 2 during rotation, thereby reducing the possibility of the heat exchange tubes 2 being bent and twisted and fractured.
[0026] The housing 1 includes an upper housing and a lower housing. An L-shaped flange 9 is provided at the docking position of the upper housing and the lower housing, which is convenient and reliable for connection and easy to manufacture. The front side of the housing 1 can be connected to a feeding auger, and the rear end is connected to a discharging auger. The steam hollow shaft 5 located on the front side of the housing 1 is connected to a driving mechanism. A moisture discharge port 10 is provided at the top of the housing 1, and observation windows 11 are evenly distributed along the length direction of the housing 1, improving the operation efficiency and operation safety of the equipment.
[0027] In the tube bundle dryer of this embodiment, by providing an intermediate plate 8, it plays a supporting role for the heat exchange tubes 2, effectively avoiding the middle part of the heat exchange tubes 2 from sagging, thereby reducing the alternating stress on the heat exchange tubes 2 during rotation. And through the improvement of the installation structure of the intermediate plate 8, the reliability and stability of the connection are improved, avoiding the deformation and even fracture of the heat exchange tubes 2. At the same time, by appropriately reducing the diameter of the intermediate heat exchange tubes 2A and the connection method, the risk of fracture of the heat exchange tubes 2 caused by uneven thermal expansion due to uneven heat exchange between the inner and outer heat exchange tubes 2B is reduced. In summary, the tube bundle dryer of this embodiment has the advantages of simple structure, convenient maintenance, long service life, etc.
[0028] The present utility model is not limited to the above embodiments. Based on the technical solutions disclosed in the present utility model, those skilled in the art can make some substitutions and deformations to some of the technical features without creative labor according to the disclosed technical content, and these substitutions and deformations are all within the protection scope of the present utility model.
Claims
1. A tube bundle dryer, comprising a housing, wherein a heat exchange tube is horizontally arranged in the housing, two ends of the heat exchange tube are installed on a fixed tube sheet, a head is arranged outside the fixed tube sheet, a steam hollow shaft passes through the head and is connected with the fixed tube sheet, a platen is annularly arranged on the outer periphery of the heat exchange tube, and two ends of the platen are connected with the outer edge of the fixed tube sheet, and is characterized in that: There are connecting seats arranged at intervals on the inner side of the copying plate. There is an intermediate perforated plate arranged at intervals between the fixed tube sheets. The edge of the intermediate perforated plate is inserted into the connecting seats. The heat exchange tubes include intermediate heat exchange tubes and outer heat exchange tubes. Both ends of the outer heat exchange tubes are joined to the fixed tube sheets by strength expansion joint. One end of the intermediate heat exchange tube is joined to the fixed tube sheet by strength expansion joint, and the other end is in floating connection with the fixed tube sheet. The aperture diameter of the intermediate heat exchange tube is smaller than that of the outer heat exchange tube.
2. The tube bundle dryer according to claim 1, characterized in that: The copying plate is L-shaped. The connecting seat includes a connecting plate, a positioning plate and a limiting plate. The connecting plate is detachably connected to the bottom surface of the copying plate. The positioning plate is perpendicularly welded to the connecting plate and the top edge of the positioning plate protrudes from the upper surface of the connecting plate. There is a notch extending to the bottom edge of the positioning plate in the middle of the positioning plate. The limiting plates are perpendicularly welded on both sides of the notch and the upper edges are welded and fixed to the connecting plate. The edge of the intermediate perforated plate is in interference fit with the notch.
3. The tube bundle dryer according to claim 2, wherein: The length of the notch is slightly smaller than the length of the limiting plate.
4. The tube bundle dryer according to claim 1, characterized in that: A central shaft tube is connected at the central position between the fixed tube sheets. Both ends of the central shaft tube are in floating connection with the fixed tube sheets. There is a through hole for the central shaft tube to pass through in the center of the intermediate perforated plate. The central shaft tube is in interference fit with the through hole.
5. The tube bundle dryer according to any one of claims 1-4, characterized in that: There are stepped notches on the outer side of the edge of the fixed tube sheet. A copying plate fixing plate is welded to the outer edge of the fixed tube sheet. The length of the copying plate fixing plate is greater than the thickness of the fixed tube sheet.
6. The tube bundle dryer according to any one of claims 1-4, characterized in that: The shell includes an upper shell and a lower shell. There is an L-shaped flange edge at the docking position of the upper shell and the lower shell.
7. The tube bundle dryer according to any one of claims 1 to 4, characterized in that: A feeding auger is connected to the front side of the shell, and a discharging auger is connected to the rear end. The steam hollow shaft located on the front side of the shell is connected to a driving mechanism. A moisture discharge port is provided at the top of the shell. Observation windows are evenly distributed along the length direction of the upper edge of the shell.