U-shaped tubular heat exchanger with detachable tubes

Abstract

The U-shaped tubular heat exchanger comprises a shell, a heat exchange tube set is arranged in the shell, and the U-shaped tubular heat exchanger is characterized in that the heat exchange tube set comprises a plurality of heat exchange units which are detachably connected, each heat exchange unit comprises an outer-layer U-shaped tube, a middle-layer U-shaped tube and an inner-layer U-shaped tube, the outer-layer U-shaped tubes are connected with outer-layer tube plates, the middle-layer U-shaped tubes are connected with inner-layer tube plates, and the inner-layer tube plates are connected with inner-layer tube plates. The middle-layer U-shaped pipe is connected with a middle-layer pipe plate, the inner-layer U-shaped pipe is connected with an inner-layer pipe plate, the inner-layer U-shaped pipe is located in the middle-layer U-shaped pipe, the middle-layer U-shaped pipe is located in the outer-layer U-shaped pipe, and the front end face of the inner-layer pipe plate is detachably connected with the rear end face of the middle-layer pipe plate. The heat exchanger has the beneficial effects that the U-shaped tubes are mutually connected and combined to form the heat exchange tube set, the U-shaped tubes can be independently detached, the U-shaped tubes can be independently replaced when damaged, and the maintenance cost is greatly reduced compared with that of a heat exchanger which is scrapped.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchangers, and in particular relates to a U-tube heat exchanger with detachable tubes. Background Art

[0002] U-tube heat exchanger is one of the commonly used heat exchangers at present. Its main structures include shell, heat exchange tube group and tube sheet. The tube sheet is connected with the heat exchange tube group. The tube sheet is provided with multiple holes connected with the heat exchange tube group. The tube sheet and the shell are connected with each other through flanges. Since it has only one tube sheet, the U-tube can freely expand and contract during thermal expansion. Therefore, it has strong adaptability to thermal expansion and is suitable for large temperature difference occasions. Since its heat exchange tube group can be disassembled and withdrawn, it is more convenient to clean the inside of the shell, and its high heat exchange efficiency can improve production efficiency. Based on the above advantages, the U-tube heat exchanger occupies a relatively important position in the field of heat exchangers. However, since its heat exchange tube group is a whole, if the heat exchange tube inside it is damaged, it can only be handled by blocking, and it cannot be repaired or replaced, resulting in an increase in the scrap rate of the equipment. In addition, since the heat exchange tube group cannot be disassembled, the internal heat exchange tube cannot be cleaned, and long-term accumulation of dirt will lead to a decrease in heat exchange efficiency. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a U-tube heat exchanger with detachable tubes, comprising a shell, a heat exchange tube group is arranged in the shell, the heat exchange tube group comprises a plurality of detachably connected heat exchange units, the heat exchange unit comprises an outer U-tube, a middle U-tube and an inner U-tube, the outer U-tube is connected to an outer tube sheet, the middle U-tube is connected to a middle tube sheet, the inner U-tube is connected to an inner tube sheet, the inner U-tube is located inside the middle U-tube, the middle U-tube is located inside the outer U-tube, the front end face of the inner tube sheet is detachably connected to the rear end face of the middle tube sheet, the front end face of the middle tube sheet is connected to the rear end face of the outer tube sheet The connection is detachable, the inner tube plate has an inner tube hole, the inner tube hole is connected to the inner U-shaped tube, the middle tube plate has a middle tube hole and a first inner extension hole, the middle tube hole is connected to the middle U-shaped tube, the outer tube plate has an outer tube hole, a middle extension hole and a second inner extension hole, the outer tube hole is connected to the outer U-shaped tube, the second inner extension hole, the first inner extension hole and the inner tube hole are located on the same axis and are equal in size, sealing members are arranged between the second inner extension hole and the first inner extension hole, and between the first inner extension hole and the inner tube hole, the middle extension hole is coaxial with the middle tube hole and is equal in size, and a sealing member is arranged between the middle extension hole and the middle tube hole.

[0004] The inner layer tube hole and / or the middle layer tube hole and / or the outer layer tube hole each include two holes, which are respectively connected with the inlet and outlet of the inner layer U-shaped tube and / or the middle layer U-shaped tube and / or the outer layer U-shaped tube.

[0005] The liquid enters the first inner extension hole through the second inner extension hole, then enters the inner U-shaped tube through the inner tube hole, and then flows out from the inner tube hole at the other end, the first inner extension hole, and the second inner extension hole in sequence.

[0006] Preferably, multiple heat exchange units are arranged in an array, a slot is provided on one side of the outer tube sheet of the non-edge heat exchange unit, and a block is provided on the other side, the slot is connected to the block, a sealing structure is fixed between two adjacent heat exchange units, one side of the outer tube sheet of the edge heat exchange unit is connected to the adjacent outer tube sheet, and the other side is connected to the shell. Multiple heat exchange units are interconnected to form a heat exchange tube group, and the number of heat exchange units depends on the volume of the shell and the actual application requirements, which can be three or four, or any number. The sides of the outer tube sheets of the heat exchange units located in the middle are interconnected through slots and blocks, and the outer tube sheets located at the edge only need to be provided with blocks or slots on the side adjacent to the heat exchange units.

[0007] Preferably, the slot and the block are both cylindrical, the slot is provided with two symmetrical first arc protrusions, and the block is provided with two symmetrical second arc protrusions. After the block is inserted into the slot, it is rotated to engage the first arc protrusion with the second arc protrusion; the position of the block with the second arc protrusion is aligned with the position of the slot without the first arc protrusion, and the block is inserted into the slot, and then the block is rotated. At this time, the second arc protrusion and the first arc protrusion are located on the same side, and the second arc protrusion is deeper into the slot than the first arc protrusion. The first arc protrusion limits the second arc protrusion from moving linearly in the direction away from the slot, thereby achieving the fixation of the two outer tube sheets.

[0008] Alternatively, the card slot and the card block are both rectangular, the edge of the card slot is provided with a convex strip, the bottom end of the card slot is closed, the root of the card block is provided with a concave filling adapted to the convex strip, a sealing structure is provided between the card slot and the card block, and the card block passes into the card slot from above, at which time the convex strip cooperates with the concave filling to prevent the card block from moving away from the card slot, and at the same time the bottom supports the card block to prevent the card block from sliding out of the card slot from the bottom end, the sealing structure can be provided at the joint between the convex strip and the concave filling, or the convex strip can be provided with a rubber material or other elastic material for sealing.

[0009] A plurality of outer tube sheets are connected to form a main tube sheet, bolt holes are arranged at both ends of the outer tube sheet, and the main tube sheet composed of a plurality of outer tube sheets is circular, and a plurality of bolt holes are spliced ​​to form a flange, that is, the main tube sheet is provided with a flange, and the flange is connected to the shell bolts.

[0010] Preferably, the outer U-shaped tube includes a first outer U-shaped tube and a second outer U-shaped tube, the middle U-shaped tube includes a first middle U-shaped tube and a second U-shaped tube, and the inner U-shaped tube includes a first inner U-shaped tube and a second inner U-shaped tube; the first outer U-shaped tube is connected to the first outer tube sheet, the second outer U-shaped tube is connected to the second outer tube sheet, the first middle U-shaped tube is connected to the first middle tube sheet, the second middle U-shaped tube is connected to the second middle tube sheet, the first inner U-shaped tube is connected to the first inner tube sheet, and the second inner U-shaped tube is connected to the second inner tube sheet.

[0011] The outer U-tube only refers to the U-tube located in the outer layer, which does not necessarily have only one layer of U-tube, but can be two, three or even more layers. The same is true for the middle and inner U-tubes. The number of layers of U-tubes can be set according to demand, and each layer of tubes is correspondingly connected to a tube sheet. The tube sheet needs to be provided with holes for liquid to enter and exit other layers of U-tubes, that is, extension holes. For example, the U-tube is provided with four layers: the first outer U-tube and the second outer U-tube, the middle U-tube, and the inner U-tube. Then, there are two inner tube holes on the inner tube sheet connected to the inner U-tube, and there are two middle tube holes and two first inner extension holes on the middle tube sheet connected to the middle U-tube. The second outer tube plate connected to the second outer U-shaped tube has two second outer tube holes, two first middle extension holes, and two second inner extension holes; the first outer tube plate connected to the first outer U-shaped tube has two first outer tube holes, two first outer extension holes, two second middle extension holes and two third inner extension holes; the inner tube hole, the first inner extension hole, the second inner extension hole, and the third inner extension hole are of the same size, located on the same axis and interconnected, the middle tube hole, the first middle extension hole, and the second middle extension hole are of the same size, located on the same axis and interconnected, and the second outer tube hole and the first outer extension hole are of the same size, located on the same axis and interconnected.

[0012] Similarly, if there are multiple outer U-shaped tubes, this arrangement is also carried out; similarly, if there are multiple middle U-shaped tubes, this arrangement is also carried out; similarly, if there are multiple inner U-shaped tubes, this arrangement is also carried out.

[0013] Under the premise of ensuring firm fixation and not affecting service life, the thickness of the middle tube sheet and the inner tube sheet should be reduced as much as possible, which is beneficial to improving heat exchange efficiency.

[0014] Preferably, the outer tube sheet, the middle tube sheet and the inner tube sheet are threadedly connected, the inner tube sheet is provided with fixing bolts, the middle tube sheet and the outer tube sheet are both provided with threaded structures, and the fixing bolts are connected with fixing nuts.

[0015] Alternatively, the inner tube sheet is provided with fixing bolts, the middle tube sheet is provided with an internal thread structure, the middle tube sheet is provided with fixing bolts, and the outer tube sheet is provided with an internal thread structure.

[0016] The outer tube sheet, the middle tube sheet and the inner tube sheet can be connected in series with one fixing bolt, which is convenient for installation. The outer tube sheet, the middle tube sheet and the inner tube sheet can also be respectively provided with fixing bolts and fixing nuts, which are fixed separately and can be removed separately when disassembled, so that maintenance is flexible.

[0017] Alternatively, the inner tube sheet is provided with a buckle, the middle tube sheet is provided with a buckle belt, the middle tube sheet is provided with a buckle, and the outer tube sheet is provided with a buckle belt, and the buckle is engaged with the buckle belt.

[0018] A buckle structure similar to a belt can also be used for connection. The front end face of the inner tube plate is hinged with a buckle, the buckle has a triangular tip, a spring is connected between the buckle and the inner tube plate, and a buckle belt array is distributed with multiple triangular protrusions, and the buckle slides in a single direction inside the buckle belt.

[0019] Alternatively, the inner tube sheet is provided with a slider, the middle tube sheet is provided with a slide groove, the middle tube sheet is provided with a slide groove, the outer tube sheet is provided with a slide groove, the slider is located in the slide groove, the slide groove is provided with a limiting bolt, the slide groove can be closed in one section and a limiting bolt can be provided in one section, or limiting bolts can be used at both ends.

[0020] The beneficial effects of the present invention are:

[0021] 1. The U-shaped tubes are connected and combined to form a heat exchange tube group, so that the U-shaped tubes can be disassembled separately, which is conducive to replacing the U-shaped tubes separately when damaged. Compared with scrapping the entire heat exchanger, the maintenance cost is greatly reduced and the service life of the heat exchanger is increased.

[0022] 2. The U-shaped tube is set as a separately detachable structure, which is simple and quick to install, is conducive to the regular cleaning of the U-shaped tube, and is easy to disassemble, which is also conducive to the regular inspection and replacement of the seals. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present application and do not constitute improper limitations on the present invention.

[0024] Figure 1 This is a schematic diagram of the assembly of the heat exchange unit of Example 1;

[0025] Figure 2 This is an overall schematic diagram of the heat exchange unit of Example 1;

[0026] Figure 3 This is a schematic diagram of the outer tube sheet assembly of Example 1;

[0027] Figure 4 This is a schematic diagram of the structure of the heat exchange tube group in Example 1;

[0028] Figure 5This is a schematic diagram of the outer tube sheet assembly of Example 2;

[0029] Figure 6 This is a partial enlarged view of the outer tube sheet of Example 2;

[0030] Figure 7 This is a schematic diagram of the assembly of the heat exchange unit of Example 3;

[0031] Figure 8 This is a schematic diagram of the assembly of the heat exchange unit of Example 4;

[0032] Fig. 9 This is a perspective view of the buckle belt structure of Example 4;

[0033] Fig.10 This is a schematic diagram of the buckle structure of Example 4;

[0034] Fig.11 This is a schematic diagram of the cooperation between the slider and the slide groove in Example 5;

[0035] Fig.12 This is an overall schematic diagram of the heat exchange unit of Example 6;

[0036] In the accompanying drawings: 1-heat exchange tube group, 2-heat exchange unit, 211-outer U-shaped tube, 212-middle U-shaped tube, 213-inner U-shaped tube, 214-outer tube sheet, 215-middle tube sheet, 216-inner tube sheet, 217-inner tube hole, 218-middle tube hole, 219-outer tube hole, 220-first inner extension hole, 221-second inner extension hole, 222-first middle extension hole, 223-slot, 224-block, 2231-convex strip, 2241-recess, 225-fixing bolt, 226- Fixing nut, 227-first arc protrusion, 228-second arc protrusion, 229-clip, 230-reset plate, 231-clip belt, 2311-clip teeth, 232-slider, 233-slideway, 234-limiting bolt, 235-first outer layer U-shaped tube, 236-second outer layer U-shaped tube, 237-first outer layer tube sheet, 238-second outer layer tube sheet, 239-second outer layer tube hole, 240-second middle extension hole, 241-first outer layer tube hole, 242-third inner extension hole, 243-main tube sheet. 244-flange, 245-first outer extension hole. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0039] In addition, in the description of the present invention, it should be understood that the terms "front", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0042] Example 1

[0043] A U-tube heat exchanger with detachable tubes comprises a shell, a heat exchange tube group 1 is arranged in the shell, the heat exchange tube group 1 comprises a plurality of detachably connected heat exchange units 2, the heat exchange unit 2 comprises an outer U-tube 211, a middle U-tube 212 and an inner U-tube 213, the outer U-tube 211 is connected to an outer tube sheet 214, the middle U-tube 212 is connected to a middle tube sheet 215, the inner U-tube 213 is connected to an inner tube sheet 216, the inner U-tube 213 is located inside the middle U-tube 212, the middle U-tube 212 is located inside the outer U-tube 211, the front end face of the inner tube sheet 216 is detachably connected to the rear end face of the middle tube sheet 215, the front end face of the middle tube sheet 215 is detachably connected to the rear end face of the outer tube sheet 214, and the inner tube sheet 216 is detachably connected to the outer tube sheet 214. There is an inner tube hole 217, which is connected to the inner U-shaped tube 213. The middle tube plate 215 has a middle tube hole 218 and a first inner extension hole 220. The middle tube hole 218 is connected to the middle U-shaped tube 212. The outer tube plate 214 has an outer tube hole 219, a middle extension hole and a second inner extension hole 221. The outer tube hole 219 is connected to the outer U-shaped tube 211. The second inner extension hole 221, the first inner extension hole 220 and the inner tube hole 217 are located on the same axis and are equal in size. Seals are provided between the second inner extension hole 221 and the first inner extension hole 220, and between the first inner extension hole 220 and the inner tube hole 217. The middle extension hole is coaxial with the middle tube hole 218 and is equal in size. A seal is provided between the middle extension hole and the middle tube hole 218.

[0044] Multiple heat exchange units 2 are distributed in an array, a slot 223 is provided on one side of the outer tube sheet 214 of the non-edge heat exchange unit 2, and a block 224 is provided on the other side, the slot 223 is engaged with the block 224, a sealing structure is fixed between two adjacent heat exchange units 2, one side of the outer tube sheet 214 of the edge heat exchange unit 2 is connected to the adjacent outer tube sheet 214, and the other side is connected to the shell.

[0045] A plurality of outer tube sheets 214 are connected to form a main tube sheet 243. The main tube sheet 243 is provided with a flange 244, and the flange 244 is bolted to the shell.

[0046] The card slot 223 and the card block 224 are both rectangular, a convex strip 2231 is provided at the edge of the card slot 223 , a recess 2241 adapted to the convex strip 2231 is provided at the root of the card block 224 , and a sealing structure is provided between the card slot 223 and the card block 224 .

[0047] The outer tube sheet 214 , the middle tube sheet 215 , and the inner tube sheet 216 are threadedly connected, the inner tube sheet 216 is provided with fixing bolts 225 , and both the middle tube sheet 215 and the outer tube sheet 214 are provided with fixing nuts 226 .

[0048] The outer U-tube 211 is connected to the outer tube sheet 214, the middle U-tube 212 is connected to the middle tube sheet 215, the inner U-tube 213 is connected to the inner tube sheet 216, the outer tube sheet 214, the middle tube sheet 215, and the inner tube sheet 216 are threadedly connected and provided with seals to form a heat exchange unit 2. Multiple heat exchange units 2 are connected to the block 224 through the slot 223 and the sealing structure to form a heat exchange tube group 1. The heat exchange tube group 1 is connected to the shell through the flange 244. When the internal U-tube is damaged, it can be disassembled and replaced at any time. Seals are provided at each connection to ensure the sealing effect of the heat exchanger. Due to the convenient disassembly and installation, the staff can regularly inspect the pipelines and seals, and can also regularly clean the heat exchange tube group 1.

[0049] Example 2

[0050] A U-tube heat exchanger with detachable tubes comprises a shell, a heat exchange tube group 1 is arranged in the shell, the heat exchange tube group 1 comprises a plurality of detachably connected heat exchange units 2, the heat exchange unit 2 comprises an outer U-tube 211, a middle U-tube 212 and an inner U-tube 213, the outer U-tube 211 is connected to an outer tube sheet 214, the middle U-tube 212 is connected to a middle tube sheet 215, the inner U-tube 213 is connected to an inner tube sheet 216, the inner U-tube 213 is located inside the middle U-tube 212, the middle U-tube 212 is located inside the outer U-tube 211, the front end face of the inner tube sheet 216 is detachably connected to the rear end face of the middle tube sheet 215, the front end face of the middle tube sheet 215 is detachably connected to the rear end face of the outer tube sheet 214, and the inner tube sheet 216 is detachably connected to the outer tube sheet 214. There is an inner tube hole 217, which is connected to the inner U-shaped tube 213. The middle tube plate 215 has a middle tube hole 218 and a first inner extension hole 220. The middle tube hole 218 is connected to the middle U-shaped tube 212. The outer tube plate 214 has an outer tube hole 219, a middle extension hole and a second inner extension hole 221. The outer tube hole 219 is connected to the outer U-shaped tube 211. The second inner extension hole 221, the first inner extension hole 220 and the inner tube hole 217 are located on the same axis and are equal in size. Seals are provided between the second inner extension hole 221 and the first inner extension hole 220, and between the first inner extension hole 220 and the inner tube hole 217. The middle extension hole is coaxial with the middle tube hole 218 and is equal in size. A seal is provided between the middle extension hole and the middle tube hole 218.

[0051] The inner tube hole 217 , the middle tube hole 218 , and the outer tube hole 219 each include two holes, which are connected to the inlet and outlet of the inner U-shaped tube 213 , the middle U-shaped tube 212 , and the outer U-shaped tube 211 in sequence.

[0052] Multiple heat exchange units 2 are distributed in an array, a slot 223 is provided on one side of the outer tube sheet 214 of the non-edge heat exchange unit 2, and a block 224 is provided on the other side, the slot 223 is engaged with the block 224, a sealing structure is fixed between two adjacent heat exchange units 2, one side of the outer tube sheet 214 of the edge heat exchange unit 2 is connected to the adjacent outer tube sheet 214, and the other side is connected to the shell.

[0053] A plurality of outer tube sheets 214 are connected to form a main tube sheet 243. The main tube sheet 243 is provided with a flange 244, and the flange 244 is bolted to the shell.

[0054] The slot 223 and the block 224 are both cylindrical. The slot 223 is provided with two symmetrical first arc protrusions 227, and the block 224 is provided with two symmetrical second arc protrusions 228. After the block 224 is inserted into the slot 223, it rotates to engage the first arc protrusions 227 with the second arc protrusions 228.

[0055] The outer tube sheet 214 , the middle tube sheet 215 , and the inner tube sheet 216 are threadedly connected, the inner tube sheet 216 is provided with a fixing bolt 225 , the middle tube sheet 215 and the outer tube sheet 214 are both provided with a threaded structure, and the fixing bolt 225 is connected with a fixing nut 226 .

[0056] Example 3

[0057] A U-tube heat exchanger with detachable tubes comprises a shell, a heat exchange tube group 1 is arranged in the shell, the heat exchange tube group 1 comprises a plurality of detachably connected heat exchange units 2, the heat exchange unit 2 comprises an outer U-tube 211, a middle U-tube 212 and an inner U-tube 213, the outer U-tube 211 is connected to an outer tube sheet 214, the middle U-tube 212 is connected to a middle tube sheet 215, the inner U-tube 213 is connected to an inner tube sheet 216, the inner U-tube 213 is located inside the middle U-tube 212, the middle U-tube 212 is located inside the outer U-tube 211, the front end face of the inner tube sheet 216 is detachably connected to the rear end face of the middle tube sheet 215, the front end face of the middle tube sheet 215 is detachably connected to the rear end face of the outer tube sheet 214, and the inner tube sheet 216 is detachably connected to the outer tube sheet 214. There is an inner tube hole 217, which is connected to the inner U-shaped tube 213. The middle tube plate 215 has a middle tube hole 218 and a first inner extension hole 220. The middle tube hole 218 is connected to the middle U-shaped tube 212. The outer tube plate 214 has an outer tube hole 219, a middle extension hole and a second inner extension hole 221. The outer tube hole 219 is connected to the outer U-shaped tube 211. The second inner extension hole 221, the first inner extension hole 220 and the inner tube hole 217 are located on the same axis and are equal in size. Seals are provided between the second inner extension hole 221 and the first inner extension hole 220, and between the first inner extension hole 220 and the inner tube hole 217. The middle extension hole is coaxial with the middle tube hole 218 and is equal in size. A seal is provided between the middle extension hole and the middle tube hole 218.

[0058] Multiple heat exchange units 2 are distributed in an array, a slot 223 is provided on one side of the outer tube sheet 214 of the non-edge heat exchange unit 2, and a block 224 is provided on the other side, the slot 223 is engaged with the block 224, a sealing structure is fixed between two adjacent heat exchange units 2, one side of the outer tube sheet 214 of the edge heat exchange unit 2 is connected to the adjacent outer tube sheet 214, and the other side is connected to the shell.

[0059] A plurality of outer tube sheets 214 are connected to form a main tube sheet 243. The main tube sheet 243 is provided with a flange 244, and the flange 244 is bolted to the shell.

[0060] The card slot 223 and the card block 224 are both rectangular, a convex strip 2231 is provided at the edge of the card slot 223 , a recess 2241 adapted to the convex strip 2231 is provided at the root of the card block 224 , and a sealing structure is provided between the card slot 223 and the card block 224 .

[0061] The inner tube sheet 216 is provided with fixing bolts 225 , the middle tube sheet 215 is provided with an internal thread structure, the middle tube sheet 215 is provided with fixing bolts 225 , and the outer tube sheet 214 is provided with an internal thread structure.

[0062] Example 4

[0063] A U-tube heat exchanger with detachable tubes comprises a shell, a heat exchange tube group 1 is arranged in the shell, the heat exchange tube group 1 comprises a plurality of detachably connected heat exchange units 2, the heat exchange unit 2 comprises an outer U-tube 211, a middle U-tube 212 and an inner U-tube 213, the outer U-tube 211 is connected to an outer tube sheet 214, the middle U-tube 212 is connected to a middle tube sheet 215, the inner U-tube 213 is connected to an inner tube sheet 216, the inner U-tube 213 is located inside the middle U-tube 212, the middle U-tube 212 is located inside the outer U-tube 211, the front end face of the inner tube sheet 216 is detachably connected to the rear end face of the middle tube sheet 215, the front end face of the middle tube sheet 215 is detachably connected to the rear end face of the outer tube sheet 214, and the inner tube sheet 216 is detachably connected to the outer tube sheet 214. There is an inner tube hole 217, which is connected to the inner U-shaped tube 213. The middle tube plate 215 has a middle tube hole 218 and a first inner extension hole 220. The middle tube hole 218 is connected to the middle U-shaped tube 212. The outer tube plate 214 has an outer tube hole 219, a middle extension hole and a second inner extension hole 221. The outer tube hole 219 is connected to the outer U-shaped tube 211. The second inner extension hole 221, the first inner extension hole 220 and the inner tube hole 217 are located on the same axis and are equal in size. Seals are provided between the second inner extension hole 221 and the first inner extension hole 220, and between the first inner extension hole 220 and the inner tube hole 217. The middle extension hole is coaxial with the middle tube hole 218 and is equal in size. A seal is provided between the middle extension hole and the middle tube hole 218.

[0064] A plurality of outer tube sheets 214 are connected to form a main tube sheet 243 . The main tube sheet 243 is provided with a flange 244 . The flange 244 is bolted to the shell.

[0065] Multiple heat exchange units 2 are distributed in an array, a slot 223 is provided on one side of the outer tube sheet 214 of the non-edge heat exchange unit 2, and a block 224 is provided on the other side, the slot 223 is engaged with the block 224, a sealing structure is fixed between two adjacent heat exchange units 2, one side of the outer tube sheet 214 of the edge heat exchange unit 2 is connected to the adjacent outer tube sheet 214, and the other side is connected to the shell.

[0066] The card slot 223 and the card block 224 are both rectangular, a convex strip 2231 is provided at the edge of the card slot 223 , a recess 2241 adapted to the convex strip 2231 is provided at the root of the card block 224 , and a sealing structure is provided between the card slot 223 and the card block 224 .

[0067] The inner tube sheet 216 is provided with a buckle 229, and a spring is connected between the buckle 229 and the inner tube sheet 216. The middle tube sheet 215 is provided with a buckle belt 231, and the buckle belt includes stepped teeth 2311. The middle tube sheet 215 is provided with a buckle 229, and a spring is connected between the buckle 229 and the middle tube sheet 215. The outer tube sheet 214 is provided with a buckle belt 231, and the buckle 229 is engaged with the buckle belt 231. The buckle 229 slides in one direction in the buckle belt 231. A reset plate 230 is provided on the buckle 229. When the buckle 299 enters the buckle belt 231, it is engaged with the tooth 2311 under the action of the spring. Since the inclined surface of the tooth 2311 will not engage with the buckle 229, the buckle 229 can move inward but not outward. If it moves outward, the reset plate 230 needs to be manually lifted.

[0068] Example 5

[0069] A U-tube heat exchanger with detachable tubes comprises a shell, a heat exchange tube group 1 is arranged in the shell, the heat exchange tube group 1 comprises a plurality of detachably connected heat exchange units 2, the heat exchange unit 2 comprises an outer U-tube 211, a middle U-tube 212 and an inner U-tube 213, the outer U-tube 211 is connected to an outer tube sheet 214, the middle U-tube 212 is connected to a middle tube sheet 215, the inner U-tube 213 is connected to an inner tube sheet 216, the inner U-tube 213 is located inside the middle U-tube 212, the middle U-tube 212 is located inside the outer U-tube 211, the front end face of the inner tube sheet 216 is detachably connected to the rear end face of the middle tube sheet 215, the front end face of the middle tube sheet 215 is detachably connected to the rear end face of the outer tube sheet 214, and the inner tube sheet 216 is detachably connected to the outer tube sheet 214. There is an inner tube hole 217, which is connected to the inner U-shaped tube 213. The middle tube plate 215 has a middle tube hole 218 and a first inner extension hole 220. The middle tube hole 218 is connected to the middle U-shaped tube 212. The outer tube plate 214 has an outer tube hole 219, a middle extension hole and a second inner extension hole 221. The outer tube hole 219 is connected to the outer U-shaped tube 211. The second inner extension hole 221, the first inner extension hole 220 and the inner tube hole 217 are located on the same axis and are equal in size. Seals are provided between the second inner extension hole 221 and the first inner extension hole 220, and between the first inner extension hole 220 and the inner tube hole 217. The middle extension hole is coaxial with the middle tube hole 218 and is equal in size. A seal is provided between the middle extension hole and the middle tube hole 218.

[0070] A plurality of outer tube sheets 214 are connected to form a main tube sheet 243 . The main tube sheet 243 is provided with a flange 244 . The flange 244 is bolted to the shell.

[0071] Multiple heat exchange units 2 are distributed in an array, a slot 223 is provided on one side of the outer tube sheet 214 of the non-edge heat exchange unit 2, and a block 224 is provided on the other side, the slot 223 is engaged with the block 224, a sealing structure is fixed between two adjacent heat exchange units 2, one side of the outer tube sheet 214 of the edge heat exchange unit 2 is connected to the adjacent outer tube sheet 214, and the other side is connected to the shell.

[0072] The card slot 223 and the card block 224 are both rectangular. The edge of the card slot 223 is provided with a convex strip 2231, and the root of the card block 224 is provided with a protruding strip 2231.

[0073] The inner tube sheet 216 is provided with a slider 232, the middle tube sheet 215 is provided with a slide groove 233, the middle tube sheet 215 is provided with a slide groove 233, the outer tube sheet 214 is provided with a slide groove 233, the slider 232 is located in the slide groove 233, and the slide groove 233 is provided with a limiting bolt 234.

[0074] Example 6

[0075] A U-shaped tube heat exchanger with detachable tubes comprises a shell, a heat exchange tube group 1 is arranged in the shell, the heat exchange tube group 1 comprises a plurality of detachably connected heat exchange units 2, the heat exchange unit 2 comprises an outer layer U-shaped tube 211, a middle layer U-shaped tube 212 and an inner layer U-shaped tube 213, the outer layer U-shaped tube 211 comprises a first outer layer U-shaped tube 235 and a second outer layer U-shaped tube 236, the first outer layer U-shaped tube 235 is connected to a first outer layer tube sheet 237, the second outer layer U-shaped tube 236 is connected to a second outer layer tube sheet 238, the middle layer U-shaped tube 212 is connected to a middle layer tube sheet 239, and the middle layer U-shaped tube 213 is connected to a middle layer tube sheet 240. The inner U-shaped tube 213 is connected to the inner tube sheet 216, the inner U-shaped tube 213 is located inside the middle U-shaped tube 212, the middle U-shaped tube 212 is located inside the second outer U-shaped tube 236, the second outer U-shaped tube 236 is located inside the first outer U-shaped tube 235, the front end face of the inner tube sheet 216 is detachably connected to the rear end face of the middle tube sheet 215, the front end face of the middle tube sheet 215 is detachably connected to the rear end face of the second outer tube sheet 238, the front end face of the second outer tube sheet 238 is detachably connected to the rear end face of the first outer tube sheet 237 The inner tube sheet 216 has an inner tube hole 217, which is connected to the inner U-shaped tube 213. The middle tube sheet 215 has a middle tube hole 218 and a first inner extension hole 220, which is connected to the middle U-shaped tube 212. The second outer tube sheet 238 has a second outer tube hole 239, a first middle extension hole 222, and a second inner extension hole 221. The second outer tube hole 239 is connected to the second outer U-shaped tube 236. The first outer tube sheet 237 has a first outer tube hole 241, a first outer extension hole 242, and a second inner extension hole 243. 5, the second middle extension hole 240 and the third inner extension hole 242, the first outer layer tube hole 241 is connected to the first outer layer U-shaped tube 235; the inner layer tube hole 217, the first inner extension hole 220, the second inner extension hole 221, and the third inner extension hole 242 are of the same size, located on the same axis and connected to each other, the middle layer tube hole 218, the first middle extension hole 222, and the second middle extension hole 240 are of the same size, located on the same axis and connected to each other, the second outer layer tube hole 239 and the first outer extension hole 245 are of the same size, located on the same axis and connected to each other.

[0076] A plurality of outer tube sheets 214 are connected to form a main tube sheet 243. The main tube sheet 243 is provided with a flange 244, and the flange 244 is bolted to the shell.

[0077] Multiple heat exchange units 2 are distributed in an array, a slot 223 is provided on one side of the outer tube sheet 214 of the non-edge heat exchange unit 2, and a block 224 is provided on the other side, the slot 223 is engaged with the block 224, a sealing structure is fixed between two adjacent heat exchange units 2, one side of the outer tube sheet 214 of the edge heat exchange unit 2 is connected to the adjacent outer tube sheet 214, and the other side is connected to the shell.

[0078] The card slot 223 and the card block 224 are both rectangular, a convex strip 2231 is provided at the edge of the card slot 223 , a recess 2241 adapted to the convex strip 2231 is provided at the root of the card block 224 , and a sealing structure is provided between the card slot 223 and the card block 224 .

[0079] The outer tube sheet 214 , the middle tube sheet 215 , and the inner tube sheet 216 are threadedly connected, the inner tube sheet 216 is provided with a fixing bolt 225 , the middle tube sheet 215 and the outer tube sheet 214 are both provided with a threaded structure, and the fixing bolt 225 is connected with a fixing nut 226 .

[0080] Anything not described in the present invention can be achieved by adopting or drawing on existing technologies.

[0081] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0082] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A U-tube heat exchanger with detachable tubes, comprising a shell, wherein a heat exchange tube group is arranged in the shell, characterized in that: The heat exchange tube group includes a plurality of detachably connected heat exchange units, the heat exchange units include an outer U-shaped tube, a middle U-shaped tube and an inner U-shaped tube, the outer U-shaped tube is connected to an outer tube sheet, the middle U-shaped tube is connected to a middle tube sheet, the inner U-shaped tube is connected to an inner tube sheet, the inner U-shaped tube is located inside the middle U-shaped tube, the middle U-shaped tube is located inside the outer U-shaped tube, the front end face of the inner tube sheet is detachably connected to the rear end face of the middle tube sheet, the front end face of the middle tube sheet is detachably connected to the rear end face of the outer tube sheet, the inner tube sheet has inner tube holes, and the inner tube holes are connected to the The inner U-shaped tube is connected, the middle tube plate has a middle tube hole and a first inner extension hole, the middle tube hole is connected to the middle U-shaped tube, the outer tube plate has an outer tube hole, a middle extension hole and a second inner extension hole, the outer tube hole is connected to the outer U-shaped tube, the second inner extension hole, the first inner extension hole and the inner tube hole are located on the same axis and are equal in size, a seal is provided between the second inner extension hole and the first inner extension hole, and between the first inner extension hole and the inner tube hole, the middle extension hole is coaxial with the middle tube hole and is equal in size, and a seal is provided between the middle extension hole and the middle tube hole.

2. A U-tube heat exchanger with detachable tubes according to claim 1, characterized in that: A plurality of the outer tube sheets are connected to form a main tube sheet, and the main tube sheet is provided with a flange, and the flange is bolted to the shell.

3. The U-tube heat exchanger with detachable tubes according to claim 1, characterized in that: Multiple heat exchange units are distributed in an array, a slot is provided on one side of the outer tube sheet of the non-edge heat exchange unit, and a block is provided on the other side, the slot is connected with the block, and a sealing structure is fixed between two adjacent heat exchange units, one side of the outer tube sheet of the edge heat exchange unit is connected to the adjacent outer tube sheet, and the other side is connected to the shell.

4. A U-tube heat exchanger with detachable tubes according to claim 3, characterized in that: The slot and the block are both cylindrical, the slot is provided with two symmetrical first arc protrusions, and the block is provided with two symmetrical second arc protrusions. After the block is inserted into the slot, it is rotated to engage the first arc protrusion with the second arc protrusion.

5. The U-tube heat exchanger with detachable tubes according to claim 3, characterized in that: The card slot and the card block are both rectangular, the edge of the card slot is provided with a convex strip, the bottom end of the card slot is closed, the root of the card block is provided with a concave filling adapted to the convex strip, and a sealing structure is provided between the card slot and the card block.

6. The U-tube heat exchanger with detachable tubes according to claim 1, characterized in that: The outer U-shaped tube includes a first outer U-shaped tube and a second outer U-shaped tube, the middle U-shaped tube includes a first middle U-shaped tube and a second U-shaped tube, and the inner U-shaped tube includes a first inner U-shaped tube and a second inner U-shaped tube; the first outer U-shaped tube is connected to a first outer tube sheet, the second outer U-shaped tube is connected to a second outer tube sheet, the first middle U-shaped tube is connected to a first middle tube sheet, the second middle U-shaped tube is connected to a second middle tube sheet, the first inner U-shaped tube is connected to a first inner tube sheet, and the second inner U-shaped tube is connected to a second inner tube sheet.

7. The U-tube heat exchanger with detachable tubes according to claim 1, characterized in that: The outer tube sheet, the middle tube sheet and the inner tube sheet are threadedly connected, the inner tube sheet is provided with fixing bolts, the middle tube sheet and the outer tube sheet are both provided with threaded structures, and the fixing bolts are connected with fixing nuts.

8. The U-tube heat exchanger with detachable tubes according to claim 1, characterized in that: The inner tube sheet is provided with fixing bolts, the middle tube sheet is provided with an internal thread structure, the middle tube sheet is provided with fixing bolts, and the outer tube sheet is provided with an internal thread structure.

9. The U-tube heat exchanger with detachable tubes according to claim 1, characterized in that: The inner tube sheet is provided with a buckle, the middle tube sheet is provided with a buckle belt, the middle tube sheet is provided with a buckle, and the outer tube sheet is provided with a buckle belt, and the buckle is engaged with the buckle belt.

10. The U-tube heat exchanger with detachable tubes according to claim 1, characterized in that: The inner tube sheet is provided with a slider, the middle tube sheet is provided with a slide groove, the middle tube sheet is provided with a slide groove, the outer tube sheet is provided with a slide groove, the slider is located in the slide groove, and the slide groove is provided with a limiting bolt.

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