Improved all-welded plate heat exchanger
The improved fully welded plate heat exchanger addresses plate leakage and deformation issues through mirror-image plates and laser welding, ensuring high efficiency and extended service life with modular production capabilities.
Patent Information
- Application Number
- CN202420808092.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-17
AI Technical Summary
The existing fully welded plate heat exchangers face issues with plate leakage, welding defects, and deformation, leading to reduced performance and shortened service life, with modular flexibility and efficient production being difficult to achieve.
The design incorporates mirror-image heat exchange plates with a double folding structure, corner blocks for reduced welding deformation, laser welding for high strength, and a pipe box for medium diversion, along with a transport system using rollers and cross bars for stability during movement.
This design enhances production efficiency, reduces welding deformation, improves sealing, and extends the service life of the heat exchanger while maintaining high heat exchange efficiency and stability.
Smart Images
Figure CN222257851U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchangers, in particular to an improved fully welded plate heat exchanger. Background Art
[0002] The fully welded plate heat exchanger is a high-efficiency heat exchanger made of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. The plate heat exchanger is an ideal equipment for liquid-liquid and liquid-steam heat exchange. It has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small footprint, wide application, and long service life. The fully welded heat exchanger is an integral device. The core is spliced by plates, and then the whole is welded together, and then the components are welded and finally formed. In the whole welding process In the process, once plate leakage or welding defects occur, it is difficult to find the leakage point or defect for effective treatment. The only way is to seal the problematic heat exchange flow channel, thereby reducing the heat exchange performance of the product and failing to achieve flexible modular welding. In addition, the entire heat exchange core surface has been assembled by arc welding with thick ties, and the welding deformation is very large, which greatly damages the service life of the entire equipment. Therefore, the current fully welded plate heat exchanger often has problems such as water leakage, cracking, and aging of the metal plate after welding. For this reason, we propose an improved fully welded plate heat exchanger. Utility Model Content
[0003] A technical problem to be solved by the present application is: how to design a structure that can be improved on the existing basis, thereby reducing the risk of plate leakage and forming modular production, and also reducing welding deformation and increasing the service life of the equipment.
[0004] In order to solve the above technical problems, the embodiment of the present application provides an improved fully welded plate heat exchanger, including a heat exchanger body, on which a plurality of heat exchange plates are installed, and further comprising:
[0005] The heat exchange unit is arranged on the heat exchanger body, and is formed by stacking and assembling a plurality of heat exchange plates in sequence. Two mirror-image heat exchange plates AB are arranged on the heat exchange unit for pairing, and a double folding structure is adopted on one side to directly form two hot and cold channels, thereby avoiding secondary processing;
[0006] Corner blocks are seal-welded on the heat exchanger body and are located at the edge of the heat exchange plate bundle. A plurality of corner blocks are provided. The corner blocks are in contact with the corrugations of the heat exchange plate bundle to reduce arc welding deformation.
[0007] In some embodiments, the heat exchange units are provided in plurality and arranged adjacent to each other, and the two pairs of heat exchange plates on a heat exchange unit are respectively sealed and welded to both ends of the heat exchange plates on adjacent heat exchange units to simplify the production process.
[0008] In some embodiments, a longer side of the heat exchange plate is designed with two folds, and the two folds form a negative angle fold to seal and close the splicing of the heat exchange plate bundle.
[0009] In some embodiments, a pipe box is installed on the heat exchanger body and is located at the side inlet of the heat exchanger body to divert the medium flow.
[0010] In some embodiments, the heat exchange plates are welded by laser welding.
[0011] In some embodiments, a base plate is placed at the bottom of the heat exchanger body, a roller is installed on the base plate, a cross bar is slidably arranged on the base plate, an inclined rod is rotatably arranged on the cross bar, the inclined rod is in contact with the roller, a guide rod is fixedly arranged on the base plate, the guide rod passes through the cross bar, a tension spring is arranged on the cross bar, and the two ends of the tension spring are respectively fixedly connected to the guide rod and the cross bar, so as to automatically return the cross bar to its position through the elastic force of the tension spring.
[0012] In some embodiments, a fixed block is slidably provided on the bottom plate, a spring is provided on the fixed block, two ends of the spring are respectively fixedly connected to the fixed block and the bottom plate, and a rope is installed on the fixed block.
[0013] The utility model has at least the following beneficial effects:
[0014] Based on the original fully welded plate heat exchanger body, it is improved by using matched AB two kinds of mirror plates to form hot and cold dual channels, and using template corner blocks for transition at the joints. Rapid molding forms modular production. The heat exchange plate has a simple structure and is very easy to form automatic welding. The welding strength is high, which simplifies the manufacturing production process, improves the working performance, and has the advantages of energy saving and consumption reduction, economic applicability, etc. At the same time, it solves the problem of secondary plate processing and the problem of high welding stress and poor stability of the fully welded heat exchanger body, which is of great promotion benefit. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;
[0016] Figure 2 For this utility model Figure 1 Another azimuth plane structure diagram;
[0017] Figure 3 For this utility model Figure 2 Schematic diagram of the structure of the middle part heat exchange unit;
[0018] Figure 4 For this utility model Figure 3 Schematic diagram of the structure of the middle A plate;
[0019] Figure 5 For this utility model Figure 3 Schematic diagram of the structure of the middle B plate;
[0020] Figure 6 For this utility model Figure 3 Another sectional structural diagram;
[0021] Figure 7 For this utility model Figure 6 Schematic diagram of the enlarged structure of the negative angle folding of the heat exchange plate in the middle A area;
[0022] Figure 8 For this utility model Figure 1 Schematic diagram of the middle pipe box structure;
[0023] Fig. 9 This is a schematic structural diagram of Example 2 of the utility model.
[0024] Fig.10 For this utility model Fig. 9 Schematic diagram of the enlarged structure of the middle B area;
[0025] Fig.11 For this utility model Fig.10 Another sectional structural diagram;
[0026] Fig.12 For this utility model Fig.11 Schematic diagram of the enlarged structure of the middle C area;
[0027] In the figure: 1-heat exchanger body; 2-heat exchange plate; 3-heat exchange unit; 4-corner block; 5-tube box; 6-bottom plate; 61-roller; 62-cross bar; 63-oblique bar; 64-guide bar; 65-tension spring; 7-fixed block; 71-spring; 72-rope one. DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0029] Example 1
[0030] See also Figure 1-8 The utility model provides a technical solution: an improved fully welded plate heat exchanger, comprising a heat exchanger body 1, on which a plurality of heat exchange plates 2 are mounted, and also comprising:
[0031] The heat exchange unit 3 is arranged on the heat exchanger body 1. The heat exchange unit 3 is formed by stacking and assembling a plurality of heat exchange plates 2 in sequence. Two types of mirror-image heat exchange plates 2, AB, are arranged on the heat exchange unit 3 for pairing. A double folding structure is adopted on one side to directly form two hot and cold channels, thereby avoiding secondary processing.
[0032] Corner blocks 4 are seal-welded on the heat exchanger body 1 and are located at the edge of the bundle of heat exchange plates 2. A plurality of corner blocks 4 are provided, and the corner blocks 4 are corrugatedly fitted with the bundle of heat exchange plates 2 to reduce arc welding deformation.
[0033] The heat exchange unit 3 is formed by pressing two mirror-image versions AB at one time, without the need for secondary processing, and can be directly assembled and welded, which greatly simplifies the production process. The left and right sides of the heat exchange unit 3 are fixed with clamps and bolts. The heat exchange unit 3 is composed of multiple heat exchange plates 2 stacked and paired in sequence, and each heat exchange plate 2 group is divided into two mirror-image plates AB for pairing, and a double folding structure is performed on the long side to directly form two hot and cold channels without the need for secondary processing. The two heat exchange plates 2 of each pair of heat exchange plates 2 are respectively sealed and welded to the front and rear ends of adjacent heat exchange plates 2 of adjacent heat exchange plate 2 groups, which greatly simplifies the entire production process and can carry out multi-module stocking production.
[0034] The long side of the heat exchange plate 2 adopts a double folding design, which is pressed and formed by a mold at one time, with high precision, high efficiency, and convenient automated welding. It solves the problems of large welding deformation, large use of consumables, and high cost in the traditional manual production process of arc welding. Negative angle folding is performed in the two folding edges, which greatly ensures the sealing tightness of the plate bundle splicing. Moreover, after the first welding, the second welding of the plate bundle trough will not affect the splicing sealing of the plate bundle, which greatly solves the influence of welding deformation on the assembly accuracy of the plate bundle during the production process.
[0035] The corner block 4, which is the same as the plate bundle corrugation, is used at the edge of the heat exchange plate 2 for sealing welding. It has the advantages of small welding area and small arc welding deformation. Since it is welded in close contact with the plate bundle corrugation, the strength is high. The effective area of the entire corner block 4 is relatively large, so that the sealing welding area with the pipe box 5 is sufficient, and there will be no micro-welding. This greatly guarantees the welding strength of the pipe box 5, thereby ensuring the pressure-bearing capacity and service life of the entire equipment.
[0036] The pipe box 5 is located at the side inlet of the heat exchanger body 1, which diverts the medium flow, avoids flow deviation, and improves the heat exchange efficiency.
[0037] The heat exchange plate 2 is welded by laser welding. The characteristic of laser welding is instantaneous high-frequency fusion welding. The strength of the weld after welding is even higher than that of the parent material, which provides a guarantee for the quality and performance of the fully welded plate heat exchanger body 1.
[0038] Example 2
[0039] See also Figure 1-12 The utility model provides a technical solution: an improved fully welded plate heat exchanger, wherein embodiment 2 is optimized based on embodiment 1.
[0040] A base plate 6 is placed at the bottom of the heat exchanger body 1. The base plate 6 and the roller 61 are used to facilitate the movement of the heat exchanger body 1. Due to the need to transport the heat exchanger body 1, the heat exchanger body 1 is usually tied to the base plate 6 by a rope, and then moved by the roller 61. The roller 61 is installed on the base plate 6. A cross bar 62 is slidably provided on the base plate 6. An inclined rod 63 is rotatably provided on the cross bar 62, and two of them are provided, which are respectively located at the two ends of the cross bar 62. The inclined rod 63 contacts the roller 61. A guide rod 64 is fixedly provided on the base plate 6. The guide rod 64 passes through the cross bar 62. A tension spring 65 is provided on the cross bar 62. The two ends of the tension spring 65 are respectively fixedly connected to the guide rod 64 and the cross bar 62, so as to automatically return the cross bar 62 to its position through the elastic force of the tension spring 65.
[0041] A fixing block 7 is slidably provided on the bottom plate 6 , a spring 71 is provided on the fixing block 7 , two ends of the spring 71 are fixedly connected to the fixing block 7 and the bottom plate 6 respectively, and a rope 72 is installed on the fixing block 7 .
[0042] When the heat exchanger body 1 is moved by the roller 61, the cross bar 62 and the inclined bar 63 are located on the side of the heat exchanger body 1, and two cross bars 62 are provided, which are respectively located on both sides of the heat exchanger body 1 and are designed in a mirror-symmetrical manner. At this time, the role of the cross bar 62 is to cooperate with the inclined bar 63 to limit the heat exchanger body 1 at the same time to prevent the heat exchanger body 1 from shaking left and right and losing its center of gravity during the movement, thereby preventing it from falling down. At this time, the inclined bar 63 is located above the roller 61, and the cross bar 62 is pulled by the tension spring 65 so that the cross bar 62 and the inclined bar 63 remain in position and limit the heat exchanger body 1. When the destination is reached or the heat exchanger body 1 is to be removed, the cross bar 62 is slid downward to drive the inclined bars 63 on both sides to move respectively. The roller 61 slides outward, and the inclined rod 63 comes into contact with the roller 61 at this time. After the cross rod 62 slides to one end, one side of the inclined rod 63 contacts and abuts against the roller 61 to brake the roller 61. At the same time, one end of the inclined rod 63 contacts and abuts against the ground. On the one hand, the roller 61 is braked and limited to make it unable to move. On the other hand, the bottom plate 6 is provided with auxiliary support so that when the heat exchanger body 1 is transported, the bottom plate 6 will not fall over due to unstable center of gravity, thereby facilitating the transportation of the heat exchanger body 1. The cross rod 62 has the functions of supporting and limiting, and supports the bottom plate 6 while braking the roller 61, achieving multiple goals at one stroke. The rollers 61 on both sides can be braked at the same time by sliding the cross rod 62 once.
[0043] When the cross bar 62 slides to one end, it presses against the fixed block 7 and slides inward, and then the cross bar 62 slides a distance until the cross bar 62 is separated from the inclined surface of the fixed block 7. Under the action of the spring 71, the fixed block 7 pops up and contacts and presses against the cross bar 62 through the back of the fixed block 7, thereby fixing the cross bar 62 to achieve an automatic locking effect. When you want to release the lock, pull the rope 72 to drive the fixed block 7 to slide, thereby separating the fixed block 7 from the cross bar 62, so that under the elastic force of the tension spring 65, the cross bar 62 pops up and automatically returns to its position, and then releases the brake lock on the roller 61, thereby releasing the lock on the base plate 6.
[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0045] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An improved fully welded plate heat exchanger, comprising a heat exchanger body (1), on which a plurality of heat exchange plates (2) are mounted, characterized in that: Also included are: A heat exchange unit (3), the heat exchange unit (3) being arranged on the heat exchanger body (1), the heat exchange unit (3) being formed by stacking and assembling a plurality of heat exchange plates (2) in sequence, and the heat exchange unit (3) being provided with two types of mirror-image heat exchange plates (2) (A and B) for pairing, and adopting a double folding structure on one side to directly form two cold and hot channels, thereby avoiding secondary processing; A corner block (4) is seal-welded on the heat exchanger body (1) and is located at the edge of the heat exchange plate (2) bundle. A plurality of corner blocks (4) are provided. The corner blocks (4) are in contact with the corrugations of the heat exchange plate (2) bundle to reduce arc welding deformation.
2. The improved fully welded plate heat exchanger according to claim 1, characterized in that: The heat exchange units (3) are provided in plurality and arranged adjacent to each other, and two pairs of heat exchange plates (2) on the heat exchange units (3) are respectively sealed and welded to the two ends of the heat exchange plates (2) on the adjacent heat exchange units (3), so as to simplify the production process.
3. The improved fully welded plate heat exchanger according to claim 2, characterized in that: The longer side of the heat exchange plate (2) is designed with two folding edges, and the two folding edges form a negative angle folding edge, which is used to seal and tightly connect the heat exchange plate (2) bundle.
4. The improved fully welded plate heat exchanger according to claim 3 is characterized in that: A pipe box (5) is installed on the heat exchanger body (1) and is located at the side inlet of the heat exchanger body (1) for diverting the flow of the medium.
5. The improved fully welded plate heat exchanger according to claim 4 is characterized in that: The heat exchange plate (2) is welded by laser welding.
6. The improved fully welded plate heat exchanger according to claim 5, characterized in that: A base plate (6) is placed at the bottom of the heat exchanger body (1), a roller (61) is installed on the base plate (6), a cross bar (62) is slidably arranged on the base plate (6), an inclined rod (63) is rotatably arranged on the cross bar (62), the inclined rod (63) is in contact with the roller (61), a guide rod (64) is fixedly arranged on the base plate (6), the guide rod (64) passes through the cross bar (62), a tension spring (65) is arranged on the cross bar (62), and the two ends of the tension spring (65) are respectively fixedly connected to the guide rod (64) and the cross bar (62), so as to automatically return the cross bar (62) to its position through the elastic force of the tension spring (65).
7. The improved fully welded plate heat exchanger according to claim 6, characterized in that: A fixed block (7) is slidably arranged on the bottom plate (6), a spring (71) is arranged on the fixed block (7), two ends of the spring (71) are respectively fixedly connected to the fixed block (7) and the bottom plate (6), and a rope (72) is installed on the fixed block (7).