Vertical nitration pipe reactor, double loop heat exchange assembly and manufacturing method thereof

Abstract

The application discloses a vertical nitration pipeline reactor, a double-loop heat exchange assembly and a manufacturing method thereof, and belongs to the technical field of chemical pipeline reactors. The double-loop heat exchange assembly mainly comprises an inner cylinder, an outer cylinder, an upper annular plate, a lower annular plate, a plurality of partition plates, a plurality of refrigerant pipes and a limiting lug. The vertical nitration pipeline reactor mainly comprises the double-loop heat exchange assembly, a shell assembly and a stirring mechanism assembly. The manufacturing method of the double-loop heat exchange assembly mainly comprises the following steps: preparing special manufacturing equipment for double-loop heat exchange, positioning an end plate assembly, performing penetrating welding on the refrigerant pipes, assembling the lower annular plate, supporting and welding the inner cylinder, positioning and welding the partition plates, assembling the outer cylinder, and welding the upper annular plate and the limiting lug. The vertical nitration pipeline reactor has high heat exchange efficiency; the double-loop heat exchange assembly is simple and unique in structural design concept, and simultaneously plays the double roles of flow guiding and cooling. The manufacturing method can realize rapid, high-precision and standardized batch production of the double-loop heat exchange assembly.

Description

Technical Field

[0001] This invention belongs to the field of chemical pipeline reactor technology. Specifically, it relates to a double-ring heat exchange assembly that simultaneously performs the dual functions of flow guidance and cooling and has a regular and simple external structure, a vertical nitration pipeline reactor using this double-ring heat exchange assembly, and a manufacturing method for achieving rapid, high-precision, and standardized mass production of this assembly. Background Technology

[0002] Nitrification is a typical strongly exothermic reaction with an extremely fast reaction rate, releasing a huge amount of heat instantaneously. If the heat of reaction cannot be removed in time, the system temperature will rise sharply, leading to thermal runaway and even serious combustion and explosion accidents. Therefore, this reaction places extremely stringent requirements on the heat transfer efficiency of the equipment. In existing technologies, nitration reactions are mostly carried out in batch reactors. However, batch reactors have inherent technical defects: their specific surface area is small, the heat exchange area available per unit volume of reaction liquid is limited, and the heat dissipation capacity is seriously insufficient. At the same time, heat is concentrated inside the reactor, the heat transfer path is long, and it is very easy to form local "hot spots," posing significant safety hazards.

[0003] To overcome the drawbacks of batch reactors, continuous tubular reactor technology has emerged. For example, Chinese patent document CN217962479U discloses a continuous nitration tubular reactor. This design attempts to improve heat dissipation by adding complex mechanical components such as baffles, piston discs, springs, and fan blades to the feed pipe, sealed tank, and heat dissipation pipes, thereby enhancing disturbance. However, this design has the following shortcomings:

[0004] 1. The heat transfer efficiency remains essentially unchanged: its core heat exchange still relies on the traditional outer wall surface, the heat transfer area per unit volume is only slightly improved, the heat transfer distance is still too long, and it is difficult to cope with the intense exothermic reaction of nitration.

[0005] 2. Complex structure and low reliability: It introduces a large number of moving parts (such as piston discs, springs, and fan blades) and delicate structures (such as baffles with leakage channels). In the highly corrosive and easily crystallizing nitration reaction environment, it is very easy to cause blockage, jamming or corrosion failure.

[0006] Ultimately, whether it is a traditional batch reactor or the aforementioned tubular reactor, the heat dissipation bottleneck stems from the same reason: heat is generated in the internal bulk phase of the reaction mixture, but it must pass through the reactor wall to be transferred to the external cooling medium. The heat transfer distance is long, the heat exchange area per unit volume is low, the thermal resistance is relatively large, and the heat accumulation rate far exceeds the removal rate.

[0007] Therefore, there is an urgent need to develop a novel nitration pipeline reactor that can fundamentally increase the heat exchange area per unit volume and significantly shorten the heat transfer distance. Simultaneously, to enable reliable industrial-scale manufacturing of this reactor, corresponding standardized manufacturing methods are also a critical issue that urgently needs to be addressed. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing a dual-ring heat exchange assembly that simultaneously performs the dual functions of flow guidance and cooling, with a neat and simple external structure, a vertical nitration pipeline reactor using this dual-ring heat exchange assembly, and a manufacturing method for achieving rapid, high-precision, and standardized mass production of this assembly.

[0009] This invention is achieved through the following technical solution:

[0010] A double-ring heat exchange assembly includes: an inner cylinder and an outer cylinder arranged along a central axis, forming an annular space between the inner cylinder and the outer cylinder. The two ends of the annular space are respectively enclosed cavities formed by an upper annular plate located above and a lower annular plate located below; multiple partition plates are fixedly arranged circumferentially and evenly spaced within the enclosed cavity, dividing the enclosed cavity into multiple sub-cavities; a gap is provided between the upper end face of each partition plate and the upper annular plate, and the lower end face of each partition plate is in contact with the lower annular plate; multiple refrigerant pipes are respectively installed in each sub-cavity, and each pipe is fixedly connected to the refrigerant end plate of the end plate assembly after passing through the lower annular plate; each refrigerant pipe includes an inlet refrigerant pipe and an outlet refrigerant pipe, and the inlet refrigerant pipe and the outlet refrigerant pipe are alternately installed in each sub-cavity; multiple limiting ears for limiting the movement are evenly spaced circumferentially at the head position of the outer cylinder.

[0011] Preferably, the inlet refrigerant pipe is a long pipe with its head end face flush with the partition plate; the outlet refrigerant pipe is a short pipe with its head end face flush with the inner end face of the lower annular plate; and the tail ends of the inlet and outlet refrigerant pipes are flush.

[0012] Preferably, the inlet and outlet refrigerant pipes are both welded to the lower annular plate for airtight connection; the inlet and outlet refrigerant pipes are both welded to the refrigerant end plate for fixed connection; the upper and lower annular plates are both welded to the inner and outer cylinders for airtight connection; the partition plate is welded to the inner cylinder for fixed connection; the end plate assembly also includes an outlet pipe integrally welded to the refrigerant end plate; and the limiting ear is welded to the outer cylinder for fixed connection.

[0013] A method for manufacturing the above-mentioned dual-ring heat exchanger assembly includes the following steps:

[0014] Step 1: Prepare the inlet refrigerant pipe, outlet refrigerant pipe, lower annular plate, inner cylinder, partition plate, outer cylinder, upper annular plate, limiting lug, and end plate assembly with refrigerant end plate;

[0015] Step 2: Prepare a dedicated manufacturing equipment for double-ring heat exchangers; the dedicated manufacturing equipment for double-ring heat exchangers includes a coaxially arranged combined jaw chuck mechanism, a partition chuck mechanism, and a variable diameter support rod assembly; wherein, both the partition chuck mechanism and the variable diameter support rod assembly can move axially relative to the combined jaw chuck mechanism; the combined jaw chuck mechanism includes a first-layer jaw chuck, a second-layer jaw chuck, and a third-layer jaw chuck arranged coaxially, and the jaws of the first-layer jaw chuck and the second-layer jaw chuck face the same direction;

[0016] Step 3: Position the end plate assembly; place the end plate assembly and clamp it using the first layer of gripper chuck;

[0017] Step 4: Welding the refrigerant pipes; After sequentially inserting and positioning the inlet and outlet refrigerant pipes, weld them together with the refrigerant end plate.

[0018] Step 5: Weld the lower annular plate; Insert the lower annular plate from the head direction of the inlet and outlet refrigerant pipes and slide it to the designated position; Clamp the lower annular plate using the second layer of jaw chuck, and then weld the inlet and outlet refrigerant pipes to the lower annular plate in a sealed manner.

[0019] Step Six: Assemble the inner cylinder; use the partition chuck mechanism to clamp the inner cylinder, attach the tail end face of the inner cylinder to the lower annular plate and spot weld it; then extend the variable diameter support rod assembly into the inner cylinder and expand it to provide support from the inside; then perform a full sealing weld between the lower annular plate and the inner cylinder;

[0020] Step 7: Welding the partition plates; Use the partition chuck mechanism to clamp the partition plates and transport them to the designated position, and weld each partition plate to the inner cylinder as a whole;

[0021] Step 8: Weld the lower annular plate to the outer cylinder; use the partition cylinder chuck mechanism to transport the outer cylinder toward the lower annular plate to the designated position, and then weld the lower annular plate and the outer cylinder together in a sealed manner;

[0022] Step 9: Weld the upper annular plate and the limiting ear; use the third layer of gripper chuck to pre-embed the upper annular plate and the limiting ear; weld the upper annular plate to the inner cylinder and the outer cylinder respectively in a sealed manner, and weld the limiting ear to the outer cylinder as a whole; at this point, the manufacturing of the double-ring heat exchange assembly is completed.

[0023] Preferably, the variable diameter support rod assembly includes an outer rigid rod fixedly connected to the support rod seat, and an inner rigid rod coaxially threadedly connected to the outer rigid rod; the head of the inner rigid rod is provided with a plurality of evenly distributed rod hinge joints along the circumferential direction; the head of the outer rigid rod is provided with a movable sleeve movably sleeved on the inner rigid rod, and the movable sleeve is provided with a cylindrical hinge joint corresponding to each of the rod hinge joints; a connecting forearm and a forked upper arm are provided between each corresponding rod hinge joint and the cylindrical hinge joint; the two ends of the connecting forearm are respectively hinged to the middle of the rod hinge joint and the forked upper arm, and the non-forked end of the forked upper arm is hinged to the cylindrical hinge joint; the inner rigid rod is also provided with a limiting ring integrally therewith, and a compression spring is provided between the movable sleeve and the limiting ring.

[0024] Preferably, the first layer of gripper chuck includes a chuck base and a plurality of long beam slide rail grippers evenly distributed along its circumference; each of the long beam slide rail grippers is provided with a shaped support claw that can slide relative to it; the shaped support claw includes a support claw body for gripping the refrigerant end plate, and an arc-shaped positioning plate fixed integrally with the support claw body; the arc-shaped positioning plate has limiting countersunk holes corresponding one-to-one with the position of the refrigerant pipe; the plurality of arc-shaped positioning plates are spliced ​​to form a complete circular plate; the long beam slide rail grippers are also equipped with indexing pins for positioning; the... The second-layer chuck includes a two-layer chuck base and a plurality of short beam jaws evenly distributed along its circumference. The short beam jaws are used to clamp the lower annular plate, and each short beam jaw has a short beam limiting post integrally fixed on its outer end face. The third-layer chuck includes a three-layer chuck base and a plurality of positioning jaws evenly distributed along its circumference. The positioning jaws have an arc-shaped support surface adapted to the upper annular plate and an ear slot adapted to the shape of the limiting ear. The positioning jaws are also equipped with ball-head plungers for fixing the limiting ear.

[0025] Preferably, the partition chuck mechanism includes a partition chuck base and a plurality of partition jaws evenly distributed along its circumference; each partition jaw is fixedly provided with a partition clamping member, the outer end face of the partition clamping member is provided with a partition slot along the length direction, the partition slot divides the partition clamping member into two opposing partition clamping pieces; at least one of the two partition clamping pieces has a partition support platform on its inner wall; at least one of the two partition clamping pieces has a partition limiting plate at its head; the gap between the two partition clamping pieces is adjusted by a partition locking screw; a cylinder limiting plate is also fixedly provided at one end of the partition jaw adjacent to the partition chuck base.

[0026] Preferably, the dual-ring heat exchanger manufacturing equipment further includes a frame, on which a slide bar is provided; there are two of each of the combined gripper chuck mechanism, the partition cylinder chuck mechanism, and the variable diameter support rod assembly, and they are symmetrically arranged relative to the frame; the combined gripper chuck mechanism is fixedly installed on the frame, and the partition cylinder chuck mechanism is slidably mounted on the slide bar.

[0027] A vertical nitration pipeline reactor, wherein the vertical nitration pipeline reactor utilizes the aforementioned double-ring heat exchange assembly.

[0028] Preferably, the vertical nitration pipeline reactor further includes a shell assembly and a stirring mechanism assembly; the shell assembly includes an outer shell with an outer jacket and a spiral guide plate, the outer jacket is equipped with a chilled water inlet and outlet pipe, and the outer shell is provided with a material feed pipe and an instrument mounting pipe for mounting instruments; the stirring mechanism assembly includes a drive mechanism mounted on the stirring end plate and a stirring shaft driven to rotate by the drive mechanism; small blades are installed on the section of the stirring shaft that extends into the inner cylinder, and large blades are installed on the section that does not extend into the inner cylinder; the stirring end plate is sealed and fixedly connected to one end of the outer shell, and the refrigerant end plate is sealed and fixedly connected to the other end of the outer shell.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] The dual-ring heat exchange assembly of this invention features a simple and unique structural design. It simultaneously serves as both a flow guide and a cooling unit, with independent and enclosed spaces inside and out that do not interfere with each other. Its simple external structural design fundamentally avoids the possibility of blockage, jamming, or corrosion failure in highly corrosive and easily crystallizing nitration reaction environments, significantly improving the operational reliability and service life of the equipment.

[0031] This invention's vertical nitration pipeline reactor achieves three-dimensional heat exchange of the reactants through a "double-pronged" approach, transforming the long-path heat transfer of "heat passing through a single wall" in traditional reactors into a short-path heat transfer of "heat being transferred from the bulk material phase to adjacent cooling surfaces on both sides." This multiplies the heat exchange area per unit volume and significantly shortens the heat transfer distance. Simultaneously, driven by the stirring mechanism, the material tumbles and circulates between the guide gap and the central through-hole of the inner cylinder, repeatedly contacting the inner and outer cooling surfaces. This results in a heat exchange efficiency that is several times higher than that of traditional reactors, sufficient to handle the intense exothermic reaction of nitration.

[0032] This invention relates to a specialized manufacturing equipment for dual-ring heat exchangers. Through the coordinated operation of a combined gripper chuck mechanism, a partition chuck mechanism, and a variable-diameter support rod assembly, it achieves high-precision alignment and positioning throughout the entire process, from end plate positioning, refrigerant pipe insertion and welding, lower annular plate assembly, inner cylinder support welding, partition plate positioning and welding, outer cylinder assembly, and upper annular plate and limiting lug welding. The variable-diameter support rod assembly cleverly utilizes the through-hole structure of the inner cylinder itself, providing reliable support points for the semi-finished product through expandable and contractible internal supports, freeing up external space and avoiding interference from the grippers during subsequent welding, thus ensuring a smooth manufacturing process. The arc-shaped positioning plate and its countersunk holes on the first-layer gripper chuck enable rapid and precise flush positioning of all refrigerant pipe ends. The universal partition chuck mechanism can accommodate the inner cylinder, outer cylinder, and partition plate, simplifying the equipment structure. The entire manufacturing process is clear, precise in positioning, and controllable in operation, enabling rapid, high-precision, and standardized mass production of dual-ring heat exchanger assemblies, laying a solid manufacturing foundation for the industrialization and promotion of this reactor technology.

[0033] This invention fundamentally breaks through the heat dissipation bottleneck of traditional nitration reactors, and plays an important role in promoting the inherent safety level and manufacturing standardization level of equipment for highly exothermic and dangerous reactions such as nitration. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the vertical nitration pipeline reactor structure of the present invention. Figure 1 .

[0035] Figure 2 This is a schematic diagram of the vertical nitration pipeline reactor structure of the present invention. Figure 2 .

[0036] Figure 3 It is along Figure 2 A cross-sectional view of line A-A in the middle.

[0037] Figure 4 This is a schematic diagram of the double-ring heat exchange assembly structure of the present invention. Figure 1 .

[0038] Figure 5 This is a schematic diagram of the double-ring heat exchange assembly structure of the present invention. Figure 2 .

[0039] Figure 6 It is along Figure 5 A cross-sectional view along the BB line.

[0040] Figure 7 This is a schematic diagram of the structure of the double-ring heat exchange assembly of the present invention after the outer cylinder, upper annular plate, and limiting ear are hidden.

[0041] Figure 8 This is a schematic diagram of the structure of the special manufacturing equipment for the double-ring heat exchanger of the present invention.

[0042] Figure 9 This is the present invention. Figure 8 Enlarged view of a portion of the image.

[0043] Figure 10 This is a three-dimensional structural diagram of the special manufacturing equipment for double-ring heat exchangers according to the present invention.

[0044] Figure 11 This is the present invention. Figure 10 Enlarged view of a portion of the image.

[0045] Figure 12 This is the present invention. Figure 11 Enlarged view of point C.

[0046] Figure 13 This is the present invention. Figure 11 Enlarged view of point D in the middle.

[0047] Figure 14 This is a schematic diagram of the three-dimensional structure of the partition clamp and partition plate clamp of the present invention.

[0048] Figure 15 This is the present invention. Figure 14 Enlarged view of a portion of the image.

[0049] Figure 16 This is a top view structural diagram of the partition clamp and partition plate clamp of the present invention.

[0050] Figure 17 This is the present invention. Figure 16 Enlarged view of point E in the middle.

[0051] Figure 18 This is a schematic diagram of the reduced diameter state structure of the variable diameter support rod assembly of the present invention.

[0052] Figure 19 yes Figure 18 Enlarged view of a portion of the image.

[0053] Figure 20 This is a schematic diagram of the expanded diameter state structure of the variable diameter support rod assembly of the present invention.

[0054] Figure 21 This is the present invention. Figure 20 Enlarged view of a portion of the image.

[0055] Figure 22 This is a schematic diagram of the state during the manufacturing process of this invention using a dedicated double-ring heat exchanger manufacturing equipment. Figure 1 .

[0056] Figure 23 This is the present invention. Figure 22 Enlarged view of a portion of the image.

[0057] Figure 24 This is a schematic diagram of the state during the manufacturing process of this invention using a dedicated double-ring heat exchanger manufacturing equipment. Figure 2 .

[0058] In the diagram: 1. Double-ring heat exchanger assembly; 111. Inner cylinder; 112. Outer cylinder; 113. Partition plate; 114. Upper annular plate; 115. Lower annular plate; 116. Inlet refrigerant pipe; 117. Outlet refrigerant pipe; 118. End plate assembly; 1181. Refrigerant end plate; 1182. Discharge pipe; 119. Limiting ear; 12. Shell assembly; 121. Outer jacket; 1211. Chilled water inlet and outlet pipes; 122. Spiral guide plate; 123. Outer shell; 1231. Material inlet pipe. ; 1232. Instrument mounting pipe; 13. Stirring mechanism assembly; 131. Stirring end plate; 132. Drive mechanism; 133. Stirring shaft; 134. Small blade; 135. Large blade; 2. Special manufacturing equipment for double-ring heat exchangers; 21. Combined gripper chuck mechanism; 211. First-layer gripper chuck; 2111. First-layer chuck seat; 2112. Long beam slide rail gripper; 2113. Irregularly shaped claw; 2114. Claw body; 2115. Arc positioning plate; 2116. Indexing pin; 2117. Limiting countersunk hole; 212. Second-layer jaw chuck; 2121. Second-layer chuck seat; 2122. Short beam jaw; 2123. Short beam limiting post; 213. Third-layer jaw chuck; 2131. Third-layer chuck seat; 2132. Positioning jaw; 2133. Arc-shaped support surface; 2134. Ear slot; 2135. Ball head plunger; 22. Divider chuck mechanism; 221. Divider chuck seat; 222. Divider jaw; 223. Divider clamp; 2231. Divider clamp piece; 224. Partition slot; 225. Partition support platform; 226. Partition limiting plate; 227. Partition locking screw; 228. Cylinder limiting plate; 23. Variable diameter support rod assembly; 231. Support rod seat; 232. Outer rigid support rod; 233. Inner rigid support rod; 2331. Limiting ring; 234. Rod hinge joint; 235. Movable sleeve; 236. Cylinder hinge joint; 237. Connecting forearm; 238. Fork-shaped upper arm; 239. Compression spring; 241. Slide rod; 242. Frame. Detailed Implementation

[0059] To enable readers to better understand the design intent of this invention, the technical solutions described below are further described in conjunction with the accompanying drawings and embodiments. It should be noted that the directional terms that may appear in the following paragraphs, including but not limited to "up," "down," "left," "right," "front," and "back," are based on the visual orientation shown in the accompanying drawings and should not be considered as limiting the scope of protection or technical solutions of this invention. Their purpose is merely to facilitate a better understanding of the technical solutions described in this invention by those skilled in the art.

[0060] In the description of this specification, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances and in conjunction with common knowledge in the field, design specifications, standard documents, etc.

[0061] Example 1

[0062] like Figures 4 to 7 As shown, a double-ring heat exchange assembly includes an inner cylinder 111 and an outer cylinder 112 arranged along a central axis. An annular space is formed between the inner cylinder 111 and the outer cylinder 112. The two ends of the annular space are respectively enclosed cavities formed by an upper annular plate 114 located above and a lower annular plate 115 located below. Both the upper annular plate 114 and the lower annular plate 115 are welded to the inner cylinder 111 and the outer cylinder 112 in a sealed manner. Multiple partition plates 113 are evenly spaced circumferentially within the enclosed cavity, dividing it into multiple sub-cavities. During operation, each sub-cavity is filled with a cooling medium. The partition plates 113 are fixedly connected to the inner cylinder 111 by welding. A gap is provided between the upper end face of the partition plate 113 and the upper annular plate 114, and the lower end face of the partition plate 113 is in contact with the lower annular plate 115. This gap facilitates the mutual flow of the cooling medium in each sub-cavity.

[0063] Multiple refrigerant pipes are installed in each sub-cavity and are all fixedly connected to the refrigerant end plate 1181 of the end plate assembly 118 after passing through the lower annular plate 115. Generally, the end plate assembly 118 also includes a discharge pipe 1182 welded to the refrigerant end plate 1181. The inlet refrigerant pipe 116 and the outlet refrigerant pipe 117 are both fixedly connected to the refrigerant end plate 1181 by welding. The refrigerant pipes include the inlet refrigerant pipe 116 and the outlet refrigerant pipe 117, and the inlet refrigerant pipe 116 and the outlet refrigerant pipe 117 are alternately installed in each sub-cavity; the lower annular plate 115 has through holes for the refrigerant pipes to pass through, and the inlet refrigerant pipe 116 and the outlet refrigerant pipe 117 are both sealed to the lower annular plate 115 by welding. The inlet refrigerant pipe 116 is a long pipe, with its head end face flush with the partition plate 113; the outlet refrigerant pipe 117 is a short pipe, with its head end face flush with the inner end face of the lower annular plate 115; the tail ends of the inlet refrigerant pipe 116 and the outlet refrigerant pipe 117 are flush. This design, with the inlet refrigerant pipe 116 being a long pipe and the outlet refrigerant pipe 117 being a short pipe, facilitates the filling of the entire enclosed cavity with refrigerant, ensuring efficient internal heat transfer. In this embodiment, the outer cylinder 112 has multiple limiting ears 119 evenly spaced circumferentially at its head position. The limiting ears 119 are fixedly connected to the outer cylinder 112 by welding.

[0064] The working principle of the double-ring heat exchange assembly 1 in this embodiment is as follows: a refrigerant circulation path is constructed inside the assembly, while its outer surface directly contacts the reactants for heat exchange. During operation, the refrigerant flow rate into the refrigerant pipe 116 is controlled to be greater than the flow rate out of the refrigerant pipe 117, ensuring that the refrigerant continuously fills each sub-cavity. After the refrigerant completes heat exchange with the reactants within the sub-cavities, it flows out through the outgoing refrigerant pipe 117, forming a continuous and efficient cooling cycle.

[0065] The dual-ring heat exchange assembly 1 in this embodiment features a simple and unique design. The inner cylinder 111 and outer cylinder 112 form independent and enclosed spaces that do not interfere with each other. Its simple and regular external contour fundamentally avoids the possibility of blockage, jamming, or corrosion failure in the highly corrosive and easily crystallizing nitration reaction environment, significantly improving the operational reliability and service life of the equipment. At the same time, the alternating arrangement of long and short refrigerant pipes ensures that the refrigerant uniformly fills the cavity and efficiently extracts heat. In addition, the dual-ring heat exchange assembly 1 is an independent unit, which is easy to disassemble and assemble, and very convenient for subsequent cleaning and maintenance.

[0066] Example 2

[0067] This embodiment provides a vertical nitration pipeline reactor that uses the double-ring heat exchange assembly described in Example 1.

[0068] like Figures 1 to 7As shown, the vertical nitration pipeline reactor of this embodiment also includes a shell assembly 12 and a stirring mechanism assembly 13. The shell assembly 12 mainly includes an outer shell 123 with an outer jacket 121 and a spiral guide plate 122. Chilled water inlet and outlet pipes 1211 are installed on the outer jacket 121, and a material feed pipe 1231 and an instrument mounting pipe 1232 for mounting instruments are provided on the outer shell 123. The material feed pipe 1231 and other functional interfaces on the outer shell 123 can be flexibly adjusted according to actual needs. The external refrigerant circulation path formed by the outer jacket 121 and the spiral guide plate 122 is a conventional design. The stirring mechanism assembly 13 includes a drive mechanism 132 mounted on the stirring end plate 131, and a stirring shaft 133 driven to rotate by the drive mechanism 132. Small blades 134 are installed on the section of the stirring shaft 133 that extends into the inner cylinder 111, and large blades 135 are installed on the section that does not extend into the inner cylinder 111. The stirring end plate 131 is sealed and fixedly connected to one end of the outer shell 123, and the refrigerant end plate 1181 is sealed and fixedly connected to the other end of the outer shell 123. The dimensions of the small blades 134 and the large blades 135 are determined by the internal installation space, and together they thoroughly mix the material inside the outer shell 123. A material flow guide gap is formed between the outer cylinder 112 of the double-ring heat exchange assembly 1 and the inner wall of the outer shell 123, the size of which is determined by the thickness of the limiting lug 119. With the cooperation of the small impeller 134, the large impeller 135, the double-ring heat exchange assembly 1, and the outer shell 123, a unique material flow path is formed: after the mixed material enters from the material inlet pipe 1231, it first flows downward along the material guide gap, then enters the central through hole of the inner cylinder 111 through the gap between the lower annular plate 115 and the refrigerant end plate 1181, and then returns upward to the material guide gap, thus forming a continuous tumbling cycle (path as follows). Figure 6 (As shown by the dashed line with the arrow in the middle).

[0069] During this circulation process, both sides of the material guide gap are cooled by a cold medium. Each time the material passes through a loop, it comes into full contact with both the inner and outer cooling surfaces, achieving highly efficient heat exchange through simultaneous mixing and heat removal. The entire flow path design is compact and ingenious, enabling three-dimensional material circulation and rapid heat removal without the need for additional guide structures.

[0070] This embodiment of the vertical nitration pipeline reactor achieves three-dimensional heat exchange of the reactants through an "internal and external attack," transforming the long-path heat transfer of "heat passing through a single wall" in traditional reactors into a short-path heat transfer of "heat being transferred from the bulk material phase to adjacent cooling surfaces on both sides." The heat exchange area per unit volume is increased several times, and the heat transfer distance is significantly shortened. At the same time, driven by the stirring mechanism, the material tumbles and circulates between the guide gap and the central through hole of the inner cylinder, repeatedly contacting the internal and external cooling surfaces. The heat exchange efficiency is several times higher than that of traditional reactors, which is sufficient to cope with the intense exothermic reaction of nitration.

[0071] Example 3

[0072] This embodiment provides a method for manufacturing the double-ring heat exchanger assembly 1 described in Embodiments 1 and 2. For example... Figures 8 to 24 As shown, the manufacturing method of the double-ring heat exchange assembly in this embodiment includes the following operation steps: Step 1: Prepare the inlet refrigerant pipe 116, the outlet refrigerant pipe 117, the lower annular plate 115, the inner cylinder 111, the partition plate 113, the outer cylinder 112, the upper annular plate 114, the limiting ear 119, and the end plate assembly 118 with a refrigerant end plate 1181.

[0073] Step Two: As Figures 8 to 21 As shown, a special manufacturing equipment 2 for double-ring heat exchangers is prepared. The special manufacturing equipment 2 for double-ring heat exchangers includes a coaxially arranged combined jaw chuck mechanism 21, a partition chuck mechanism 22, and a variable diameter support rod assembly 23; wherein, both the partition chuck mechanism 22 and the variable diameter support rod assembly 23 can move axially relative to the combined jaw chuck mechanism 21; the combined jaw chuck mechanism 21 includes a first-layer jaw chuck 211, a second-layer jaw chuck 212, and a third-layer jaw chuck 213 coaxially arranged, and the jaws of the first-layer jaw chuck 211 and the second-layer jaw chuck 212 face the same direction.

[0074] Step 3: Position the end plate assembly 118; place the end plate assembly 118 and clamp it using the first-layer gripper chuck 211.

[0075] Step 4: Welding the refrigerant pipes; After inserting and positioning the inlet refrigerant pipe 116 and outlet refrigerant pipe 117 in sequence, weld them together with the refrigerant end plate 1181.

[0076] Step 5: Weld the lower annular plate 115; insert the lower annular plate 115 from the head direction of the inlet refrigerant pipe 116 and the outlet refrigerant pipe 117, and slide it to the designated position. Then, use the second-layer clamping chuck 212 to clamp the lower annular plate 115. Next, move the semi-finished product obtained in Step 4 and adjust it until the head end face of the outlet refrigerant pipe 117 is flush with the inner end face of the lower annular plate 115, thus completing the positioning. Then, weld the inlet refrigerant pipe 116, the outlet refrigerant pipe 117, and the lower annular plate 115 together in a sealed manner.

[0077] Step Six: Assemble the inner cylinder; use the partition chuck mechanism 22 to clamp the inner cylinder 111, and attach and spot weld the tail end face of the inner cylinder 111 to the lower annular plate 115. After spot welding, the partition chuck mechanism 22 needs to be removed to avoid interference; otherwise, subsequent sealing welding cannot be performed. However, before removing it, the variable diameter support rod assembly 23 needs to be inserted into the inner cylinder 111 and expanded to provide support from the inside. At this time, the inner cylinder 111 is mainly supported by the variable diameter support rod assembly 23. The inner cylinder 111 itself has a through-hole structure, and this manufacturing method makes reasonable use of its own structure, demonstrating ingenious design. Then, the lower annular plate 115 and the inner cylinder 111 are sealed and fully welded.

[0078] Step 7: Welding the partition plates 113; using the partition chuck mechanism 22, clamp the partition plates 113 and transport them to the designated positions, welding each partition plate 113 to the inner cylinder 111 as a single unit. This partition chuck mechanism 22 is a universal structure, capable of clamping not only the partition plates 113 but also the inner cylinder 111 and outer cylinder 112, effectively simplifying the equipment structure. In this step, the partition plates 113 and inner cylinder 111 are fixed by intermittent welding to ensure sufficient mechanical strength, as the cooling medium within each sub-cavity is already interconnected.

[0079] Step 8: Weld the lower annular plate 115 to the outer cylinder 112; use the partition cylinder chuck mechanism 22 to transport the outer cylinder 112 toward the lower annular plate 115 to the designated position, and then weld the lower annular plate 115 and the outer cylinder 112 together in a sealed manner. Specifically, in this step, the partition cylinder chuck mechanism 22 is also used to clamp the outer cylinder 112. After the outer cylinder 112 and the lower annular plate 115 are spot welded, the partition cylinder chuck mechanism 22 is removed to eliminate interference before full welding. At this time, the semi-finished product is still mainly supported by the variable diameter support rod assembly 23.

[0080] Step Nine: Weld the upper annular plate 114 and the limiting ear 119; the upper annular plate 114 and the limiting ear 119 are pre-embedded using the third-layer jaw chuck 213. Specifically, the upper annular plate 114 and the limiting ear 119 are pre-installed on the third-layer jaw chuck 213. After moving the semi-finished product to the designated position, the upper annular plate 114 is sealed and welded to the inner cylinder 111 and the outer cylinder 112 respectively; then the limiting ear 119 is welded to the outer cylinder 112 as a whole. At this point, the manufacturing of the double-ring heat exchange assembly is completed.

[0081] This embodiment of the dual-ring heat exchanger manufacturing equipment achieves high-precision alignment and positioning throughout the entire process—from end plate positioning, refrigerant pipe insertion and welding, lower annular plate assembly, inner cylinder support welding, partition plate positioning and welding, outer cylinder assembly, and upper annular plate and limiting lug welding—through the coordinated operation of a combined gripper chuck mechanism, a partition chuck mechanism, and a variable-diameter support rod assembly. The variable-diameter support rod assembly cleverly utilizes the through-hole structure of the inner cylinder, providing reliable support points for the semi-finished product through expandable and contractible internal supports, freeing up external space and preventing gripper interference with subsequent welding, thus ensuring a smooth manufacturing process. The universal partition chuck mechanism can accommodate the gripping of the inner cylinder, outer cylinder, and partition plate, simplifying the equipment structure. The entire manufacturing process is clear, precise, and controllable, enabling rapid, high-precision, and standardized mass production of the dual-ring heat exchanger assembly, laying a solid manufacturing foundation for the industrialization and promotion of this reactor technology.

[0082] This embodiment plays an important role in promoting the inherent safety level and manufacturing standardization of equipment for highly exothermic and risky reactions such as nitration.

[0083] Example 4

[0084] Based on Embodiments 2 and 3, this embodiment continues to describe in detail the technical features involved and the functions and roles of these technical features in the present invention, so as to help those skilled in the art to fully understand the technical solution of the present invention and reproduce it.

[0085] like Figures 18 to 21 As shown, the variable diameter support rod assembly 23 includes an outer rigid support rod 232 fixedly connected to the support rod seat 231, and an inner rigid support rod 233 coaxially threadedly connected to the outer rigid support rod 232. The support rod seat 231 is slidably mounted on the long beam slide rail claw 2112. Both the outer rigid support rod 232 and the inner rigid support rod 233 are made of rigid materials, and the inner rigid support rod 233 adopts a solid structure to ensure the mechanical strength of the variable diameter support rod assembly 23. Of course, since the pipeline reactor itself is relatively small, even if the inner rigid support rod 233 is hollow, the variable diameter support rod assembly can still provide internal support. For ease of operation, an operating handle is installed at the end of the inner rigid support rod 233.

[0086] The head of the inner rigid support rod 233 is provided with multiple evenly distributed rod hinge joints 234 along the circumferential direction; the head of the outer rigid support rod 232 is provided with a movable sleeve 235 that is movably sleeved on the inner rigid support rod 233, and the movable sleeve 235 is provided with a cylindrical hinge joint 236 corresponding to the rod hinge joints 234. Each corresponding rod hinge joint 234 and cylindrical hinge joint 236 is provided with a connecting arm 237 and a forked arm 238. Specifically, the two ends of the connecting arm 237 are respectively hinged to the middle of the rod hinge joint 234 and the forked arm 238, and the non-forked end of the forked arm 238 is hinged to the cylindrical hinge joint 236.

[0087] The specific working principle of the variable diameter support rod assembly 23 in this embodiment is as follows: The inner rigid support rod 233 rotates, and the inner rigid support rod 233, which is threadedly connected to the outer rigid support rod 232, moves backward while rotating. At this time, the connecting arm 237 also produces the same movement. The backward movement of the connecting arm 237 pushes the fork end of the fork-shaped upper arm 238 to expand outward (e.g., Figure 21 (As shown). When the multiple forked arms 238 expand to press against the inner wall of the inner cylinder 111, the inner support rigid rod 233 can no longer rotate. At this time, the inner support rigid rod 233 provides reliable support for the double-ring heat exchange assembly 1. When no support is needed, the inner support rigid rod 233 is rotated in the opposite direction. The inner support rigid rod 233 and the connecting small arm 237 both move in the opposite direction. The fork ends of the forked arms 238 fall back until the forked arms 238 press against the limiting surfaces of the connecting small arms 237. At this time, the inner support rigid rod 233 can no longer rotate, and the variable diameter support rod assembly 23 shrinks to its maximum limit.

[0088] In this embodiment, a rubber protective layer is fixed to the end face of the fork-shaped boom 238 to prevent wear on the inner wall of the inner cylinder 111. This embodiment also includes an integrally formed limiting ring 2331 on the inner support rigid rod 233, and a compression spring 239 is provided between the movable sleeve 235 and the limiting ring 2331. When the inner support rigid rod 233 moves backward, the limiting ring 2331 and the movable sleeve 235 together compress the compression spring 239, which applies a certain compressive force to the inner support rigid rod 233. This compressive force effectively prevents the inner support rigid rod 233 from rotating due to accidental contact. Alternatively, a locating pin can be used for locking, which is a conventional technique and will not be elaborated here.

[0089] like Figures 11 to 12 As shown, the first-layer gripper chuck 211 in this embodiment includes a chuck base 2111 and multiple long beam slide rail grippers 2112 evenly distributed along its circumference. Each long beam slide rail gripper 2112 is provided with a shaped claw 2113 that can slide relative to it. Furthermore, the shaped claw 2113 includes a claw body 2114 for gripping the refrigerant end plate 1181, and an arc-shaped positioning plate 2115 fixedly integrated with the claw body 2114. The arc-shaped positioning plate 2115 has limiting countersunk holes 2117 that correspond one-to-one with the positions of the refrigerant pipes, and multiple arc-shaped positioning plates 2115 are spliced ​​to form a complete annular plate. When the end of the refrigerant pipe is inserted into the limiting countersunk hole 2117, the ends of each refrigerant pipe are naturally aligned. The long beam slide rail claw 2112 is also equipped with an indexing pin 2116 for positioning. The indexing pin 2116 has a telescopic function and is used to limit the position of the long beam slide rail claw 2112 when needed.

[0090] The second-layer chuck 212 includes a second-layer chuck base 2121 and a plurality of short beam jaws 2122 evenly distributed along its circumference. The short beam jaws 2122 are used to clamp the lower annular plate 115, and each short beam jaw 2122 has a short beam limiting post 2123 integrally fixed on its outer end face. The position of the short beam jaws 2122 is fixed; the short beam limiting post 2123 is used to determine the distance between the refrigerant end plate 1181 and the lower annular plate 115, that is, to determine the installation position of the lower annular plate 115 on the refrigerant pipe. The third-layer chuck 213 includes a third-layer chuck base 2131 and a plurality of positioning jaws 2132 evenly distributed along its circumference. The positioning gripper 2132 has an arc-shaped support surface 2133 adapted to the upper annular plate 114, and an ear slot 2134 adapted to the shape of the limiting ear 119; and a ball-head plunger 2135 for fixing the limiting ear 119 is also installed on the positioning gripper 2132. The arc-shaped support surface 2133 is adapted to the upper annular plate 114, and the ear slot 2134 is adapted to the limiting ear 119. The limiting ear 119, which is pre-embedded in the ear slot 2134, is temporarily fixed by the ball-head plunger 2135. The ball-head plunger 2135 is commonly known as a "glass ball screw". When the external force is large enough, it overcomes the fixing force of the ball-head plunger 2135 on the limiting ear 119, thereby releasing the temporary fixation.

[0091] like Figure 10 , Figure 11 and Figures 14 to 17 As shown, the partition chuck mechanism 22 of this embodiment includes a partition chuck base 221 and a plurality of partition jaws 222 evenly distributed along its circumference. Each partition jaw 222 is fixedly provided with a partition clamp 223. A partition slot 224 is formed on the outer end face of the partition clamp 223 along its length, dividing the partition clamp 223 into two opposing partition plates 2231. At least one of the two partition plates 2231 has a partition support platform 225 on its inner wall. At least one of the two partition plates 2231 has a partition limiting plate 226 at its head. The gap between the two partition plates 2231 is adjusted by a partition locking screw 227. A cylinder limiting plate 228 is also fixedly provided at one end of the partition jaw 222 adjacent to the partition chuck base 221. Furthermore, in the two partition clamping pieces 2231, one piece near the head of the partition locking screw 227 has a through hole, and the other piece has a threaded hole. The partition locking screw 227 passes through the through hole and is threaded into the threaded hole. Rotating the partition locking screw 227 can adjust the gap between the two partition clamping pieces 2231.

[0092] The partition chuck mechanism 22 in this embodiment is highly versatile, capable of clamping not only the partition plate 113, but also the inner cylinder 111 and the outer cylinder 112. Specifically, when clamping the partition plate 113, the partition plate 113 is inserted into the partition slot 224, positioned by the partition support platform 225 and the partition limiting plate 226, and then locked by the partition locking screw 227. When clamping the inner cylinder 111 or the outer cylinder 112, the outer end face of the partition clamp 223 contacts the outer wall of the cylinder to achieve clamping.

[0093] like Figure 8 , Figure 10 As shown, the dual-ring heat exchanger manufacturing equipment 2 in this embodiment also includes a frame 242, on which a slide rod 241 is provided. There are two of each of the combined gripper chuck mechanism 21, the partition cylinder chuck mechanism 22, and the variable diameter support rod assembly 23, symmetrically arranged relative to the frame 242. The combined gripper chuck mechanism 21 is fixedly installed on the frame 242, and the partition cylinder chuck mechanism 22 is slidably mounted on the slide rod 241. This symmetrical design allows for the simultaneous manufacturing of two dual-ring heat exchanger assemblies, improving the equipment's practicality and production efficiency.

[0094] Based on Example 3, combined with Figures 22 to 24 This embodiment provides a more detailed explanation of steps three through nine:

[0095] Step 3: Position the end plate assembly 118; place the end plate assembly 118 and clamp it using the first-layer jaw chuck 211. Specifically, place the refrigerant end plate 1181 of the end plate assembly 118 on the claw body 2114, and then adjust the adjustment knob on the first-layer chuck seat 2111 to make the three claw bodies 2114 move centripetally and clamp the refrigerant end plate 1181. At this time, the position of the end plate assembly 118 can be changed by sliding the irregular claw 2113.

[0096] Step 4: Welding the refrigerant pipes; After sequentially inserting and positioning the inlet refrigerant pipe 116 and outlet refrigerant pipe 117, weld them together with the refrigerant end plate 1181. Specifically, insert the inlet refrigerant pipe 116 and outlet refrigerant pipe 117 sequentially towards the refrigerant end plate 1181. Since the three irregularly shaped claws 2113 are already in a closed position, the three arc-shaped positioning plates 2115 now form a whole. The sequentially inserted refrigerant pipes will enter their respective limiting countersunk holes 2117. Under the calibration of the limiting countersunk holes 2117, the end faces of each refrigerant pipe are naturally flush, thereby achieving the positioning of each refrigerant pipe.

[0097] Step 5: Weld the lower annular plate 115; insert the lower annular plate 115 from the head direction of the inlet refrigerant pipe 116 and the outlet refrigerant pipe 117, and slide it to the end position of the short beam claw 2122. Adjust the adjusting knob on the second-layer chuck seat 2121 to make the three short beam claws 2122 move centripetally and clamp the lower annular plate 115. Then move the semi-finished product obtained in Step 4. When the refrigerant end plate 1181 touches the short beam limiting post 2123, the head end face of the outlet refrigerant pipe 117 is flush with the inner end face of the lower annular plate 115, indicating that the lower annular plate 115 has been positioned. Then weld the inlet refrigerant pipe 116 and the outlet refrigerant pipe 117 to the lower annular plate 115 in a sealed manner.

[0098] Step Six: Assemble the inner cylinder; use the partition chuck mechanism 22 to clamp the inner cylinder 111, and slide the partition chuck mechanism 22 to bring the tail end face of the inner cylinder 111 into contact with the lower annular plate 115 and spot weld it. After spot welding, the partition chuck mechanism 22 needs to be removed to avoid interference; otherwise, subsequent sealing welding cannot be performed. However, before removing it, the variable diameter support rod assembly 23 needs to be inserted into the inner cylinder 111 and expanded to provide support from the inside. At this time, the inner cylinder 111 is mainly supported by the variable diameter support rod assembly 23. The inner cylinder 111 itself has a through-hole structure, and this manufacturing method makes reasonable use of its own structure as a support foundation. Then, the lower annular plate 115 and the inner cylinder 111 are sealed and fully welded.

[0099] Step 7: Welding the partition plates 113; using the partition chuck mechanism 22, the partition plates 113 are clamped and transported to the designated position, i.e., the partition plates 113 are attached to the lower annular plate 115, and then each partition plate 113 is welded to the inner cylinder 111. This partition chuck mechanism 22 is a universal structure, capable of clamping not only the partition plates 113 but also the inner cylinder 111 and outer cylinder 112, effectively simplifying the equipment structure. In this step, the partition plates 113 and inner cylinder 111 are fixed by intermittent welding to ensure sufficient mechanical strength, as the cooling medium in each sub-cavity is already interconnected. After the partition plates 113 are welded, the partition chuck mechanism 22 can be reset.

[0100] Step 8: Weld the lower annular plate 115 and the outer cylinder 112; use the partition cylinder chuck mechanism 22 to transport the outer cylinder 112 toward the lower annular plate 115 to the designated position, so that the outer cylinder 112 and the lower annular plate 115 are in contact, and then weld the lower annular plate 115 and the outer cylinder 112 together in a sealed manner. Specifically, the partition cylinder chuck mechanism 22 is also used to clamp the outer cylinder 112. After the outer cylinder 112 and the lower annular plate 115 are spot welded, the partition cylinder chuck mechanism 22 is removed. At this time, the semi-finished product is still mainly supported by the variable diameter support rod assembly 23. After the partition cylinder chuck mechanism 22 is removed, there is enough working space outside, and then the lower annular plate 115 and the outer cylinder 112 are fully welded.

[0101] Step 9: Weld the annular plate 114 and the limiting ear 119. (Example) Figure 24As shown, an upper annular plate 114 and a limiting ear 119 are pre-embedded in the third-layer jaw chuck 213. The upper annular plate 114 is welded first, followed by the limiting ear 119. Specifically, the upper annular plate 114 is pre-installed in the third-layer jaw chuck 213 and clamped by four positioning jaws 2132. The semi-finished product is then slid until the upper annular plate 114 is in contact with the end faces of the inner and outer cylinders (the sliding position of the semi-finished product is determined by the indexing pin 2116). The upper annular plate 114 is then pre-fixed by spot welding. The semi-finished product is then moved to a position convenient for operation, and the upper annular plate 114 is fully welded. The semi-finished product is then moved back to the position of the third-layer jaw chuck 213, and the position of the semi-finished product is adjusted according to the position of the limiting ear 119 (this position is also determined by the indexing pin 2116). After positioning, the limiting ear 119 is welded. The assembly then continues to move towards the center of the frame. The limiting ear 119 follows the movement of the outer cylinder 112, overcoming the fixing force of the ball plunger 2135 and disengaging from the positioning jaw 2132. Then, the adjusting knob on the three-layer chuck seat 2131 is adjusted to expand the diameter of the positioning jaw 2132, preventing interference with the limiting ear 119 during the reverse movement of the double-ring heat exchanger assembly 1. At this point, the manufacturing of the double-ring heat exchanger assembly is complete. The double-ring heat exchanger assembly 1 is then moved back to an open position and hoisted out.

[0102] This embodiment of the dual-ring heat exchanger manufacturing equipment achieves high-precision alignment and positioning throughout the entire process—from end plate positioning, refrigerant pipe insertion and welding, lower annular plate assembly, inner cylinder support welding, partition plate positioning and welding, outer cylinder assembly, and upper annular plate and limiting lug welding—through the coordinated operation of a combined gripper chuck mechanism, a partition cylinder chuck mechanism, and a variable-diameter support rod assembly. The variable-diameter support rod assembly cleverly utilizes the through-hole structure of the inner cylinder itself, providing reliable support points for the semi-finished product through expandable and contractible internal supports, freeing up external space and avoiding interference from the grippers during subsequent welding, thus ensuring a smooth manufacturing process. The arc-shaped positioning plate and its countersunk holes on the first-layer gripper chuck enable rapid and precise flush positioning of all refrigerant pipe ends. The universal partition cylinder chuck mechanism can accommodate the gripping of the inner cylinder, outer cylinder, and partition plate, simplifying the equipment structure. The entire manufacturing process is clear, precise in positioning, and controllable in operation, enabling rapid, high-precision, and standardized mass production of the dual-ring heat exchanger assembly, laying a solid manufacturing foundation for the industrialization and promotion of this reactor technology. This embodiment fundamentally breaks through the heat dissipation bottleneck of traditional nitration reactors, and plays an important role in promoting the inherent safety level and manufacturing standardization level of equipment for highly exothermic and dangerous reactions such as nitration.

[0103] In summary, these are merely preferred embodiments of the present invention and are not intended to limit the scope of the invention. All equivalent variations and modifications made in accordance with the shape, structure, features, and spirit of the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for manufacturing a double-ring heat exchanger assembly, characterized in that, The following steps are included: Step 1: Prepare the inlet refrigerant pipe (116), outlet refrigerant pipe (117), lower annular plate (115), inner cylinder (111), partition plate (113), outer cylinder (112), upper annular plate (114), limiting ear (119), and end plate assembly (118) with refrigerant end plate (1181). Step 2: Prepare special manufacturing equipment for double-ring heat exchangers (2); The dual-ring heat exchanger manufacturing equipment (2) includes a coaxially arranged combined gripper chuck mechanism (21), a partition cylinder chuck mechanism (22), and a variable diameter support rod assembly (23). The partition cylinder chuck mechanism (22) and the variable diameter support rod assembly (23) can both move axially relative to the combined jaw chuck mechanism (21); the combined jaw chuck mechanism (21) includes a first-layer jaw chuck (211), a second-layer jaw chuck (212) and a third-layer jaw chuck (213) arranged coaxially, and the jaws of the first-layer jaw chuck (211) and the second-layer jaw chuck (212) have the same orientation; Step 3: Position the end plate assembly (118); Place the end plate assembly (118) and clamp it using the first layer of gripper chuck (211); Step 4: Welding the refrigerant pipes; After inserting and positioning the inlet refrigerant pipe (116) and outlet refrigerant pipe (117) in sequence, weld them together with the refrigerant end plate (1181); Step 5: Weld the lower annular plate (115); Insert the lower annular plate (115) from the head direction of the inlet refrigerant pipe (116) and the outlet refrigerant pipe (117), and slide it to the designated position; clamp the lower annular plate (115) using the second layer of jaw chuck (212), and then seal the inlet refrigerant pipe (116) and the outlet refrigerant pipe (117) to the lower annular plate (115) with a tight weld; Step 6: Assemble the inner cylinder; use the partition chuck mechanism (22) to clamp the inner cylinder (111), attach the tail end face of the inner cylinder (111) to the lower annular plate (115) and spot weld it; then extend the variable diameter support rod assembly (23) into the inner cylinder (111) and expand it to provide support from the inside; then perform a full sealing weld between the lower annular plate (115) and the inner cylinder (111); Step 7: Welding partition plates (113); Use the partition chuck mechanism (22) to clamp the partition plates (113) and transport them to the designated position, and weld each partition plate (113) to the inner cylinder (111) as a whole; Step 8: Weld the lower annular plate (115) and the outer cylinder (112); Use the partition chuck mechanism (22) to transport the outer cylinder (112) toward the lower annular plate (115) to the designated position, and then weld the lower annular plate (115) and the outer cylinder (112) together in a sealed manner; Step 9: Weld the upper annular plate (114) and the limiting ear (119); use the third-layer gripper chuck (213) to pre-embed the upper annular plate (114) and the limiting ear (119); weld the upper annular plate (114) to the inner cylinder (111) and the outer cylinder (112) respectively in a sealed manner, and weld the limiting ear (119) to the outer cylinder (112) as a whole; at this point, the manufacturing of the double-ring heat exchange assembly is completed; The dual-ring heat exchange assembly includes: An inner cylinder (111) and an outer cylinder (112) are arranged along the same central axis. An annular space is formed between the inner cylinder (111) and the outer cylinder (112). The two ends of the annular space are respectively formed by an upper annular plate (114) located above and a lower annular plate (115) located below, which constitute closed cavities. Multiple partition plates (113) are fixedly installed in the closed cavity at uniform intervals along the circumference, dividing the closed cavity into multiple sub-cavities; a gap is provided between the upper end face of the partition plate (113) and the upper annular plate (114), and the lower end face of the partition plate (113) is in contact with the lower annular plate (115). Multiple refrigerant pipes are installed in each of the sub-cavities, and each pipe is fixedly connected to the refrigerant end plate (1181) of the end plate assembly (118) after passing through the lower annular plate (115); the refrigerant pipes include an inlet refrigerant pipe (116) and an outlet refrigerant pipe (117), and the inlet refrigerant pipe (116) and the outlet refrigerant pipe (117) are alternately installed in each of the sub-cavities; The head of the outer cylinder (112) is provided with a plurality of limiting ears (119) that serve to limit the movement.

2. The manufacturing method of the double-ring heat exchanger assembly according to claim 1, characterized in that: The inlet refrigerant pipe (116) is a long pipe, and its head end face is flush with the partition plate (113); the outlet refrigerant pipe (117) is a short pipe, and its head end face is flush with the inner end face of the lower annular plate (115); the tail ends of the inlet refrigerant pipe (116) and the outlet refrigerant pipe (117) are flush.

3. The manufacturing method of the double-ring heat exchange assembly according to claim 1 or 2, characterized in that: The inlet refrigerant pipe (116) and outlet refrigerant pipe (117) are both welded to the lower annular plate (115) for airtight connection. The inlet refrigerant pipe (116) and outlet refrigerant pipe (117) are both fixedly connected to the refrigerant end plate (1181) by welding. The upper annular plate (114) and the lower annular plate (115) are both welded to the inner cylinder (111) and the outer cylinder (112) in a sealed manner; The partition plate (113) is fixedly connected to the inner cylinder (111) by welding; The end plate assembly (118) also includes a discharge pipe (1182) that is welded together with the refrigerant end plate (1181). The limiting ear (119) is fixedly connected to the outer cylinder (112) by welding.

4. The manufacturing method of the double-ring heat exchanger assembly according to claim 1, characterized in that: The variable diameter support rod assembly (23) includes an outer rigid support rod (232) fixedly connected to the support rod seat (231), and an inner rigid support rod (233) coaxially threadedly connected to the outer rigid support rod (232). The head of the inner rigid support rod (233) is provided with a plurality of rod hinge joints (234) evenly distributed along the circumference; the head of the outer rigid support rod (232) is provided with a movable sleeve (235) movably sleeved on the inner rigid support rod (233), and the movable sleeve (235) is provided with a sleeve hinge joint (236) corresponding one-to-one with the rod hinge joints (234). Each corresponding rod hinge joint (234) and cylindrical hinge joint (236) is provided with a connecting arm (237) and a fork-shaped upper arm (238); the two ends of the connecting arm (237) are respectively hinged to the middle of the rod hinge joint (234) and the fork-shaped upper arm (238), and the non-fork end of the fork-shaped upper arm (238) is hinged to the cylindrical hinge joint (236); The inner support rigid rod (233) is also provided with a limiting ring (2331) integrated with it, and a compression spring (239) is provided between the movable sleeve (235) and the limiting ring (2331).

5. The method for manufacturing the double-ring heat exchange assembly according to claim 1 or 4, characterized in that: The first layer of jaw chuck (211) includes a chuck base (2111) and a plurality of long beam slide rail jaws (2112) evenly distributed along its circumference; each of the long beam slide rail jaws (2112) is provided with a shaped claw (2113) that can slide relative to it; the shaped claw (2113) includes a claw body (2114) for gripping the refrigerant end plate (1181), and an arc positioning plate (2115) fixedly integrated with the claw body (2114); the arc positioning plate (2115) is provided with limiting countersunk holes (2117) corresponding one-to-one with the position of the refrigerant pipe; the plurality of arc positioning plates (2115) are spliced ​​into a complete circular plate; the long beam slide rail jaws (2112) are also equipped with indexing pins (2116) for positioning. The second layer of the jaw chuck (212) includes a second layer of chuck base (2121) and a plurality of short beam jaws (2122) evenly distributed along its circumference. The short beam jaws (2122) are used to clamp the lower annular plate (115), and each of the short beam jaws (2122) has a short beam limiting post (2123) integrally fixed on its outer end face. The third-layer chuck (213) includes a three-layer chuck base (2131) and a plurality of positioning jaws (2132) evenly distributed along its circumference; the positioning jaws (2132) are provided with an arc-shaped support surface (2133) adapted to the upper annular plate (114) and an ear slot (2134) adapted to the shape of the limiting ear (119); and the positioning jaws (2132) are also equipped with a ball-head plunger (2135) for fixing the limiting ear (119).

6. The method for manufacturing the double-ring heat exchange assembly according to claim 1 or 4, characterized in that: The diaphragm chuck mechanism (22) includes a diaphragm chuck seat (221) and a plurality of diaphragm jaws (222) evenly distributed along its circumference. Each of the partition clamps (222) is fixedly provided with a partition clamp (223), and the outer end face of the partition clamp (223) is provided with a partition slot (224) along the length direction. The partition slot (224) divides the partition clamp (223) into two opposing partition clamp pieces (2231). At least one of the two partition clamp pieces (2231) has a partition support platform (225) on its inner wall. At least one of the two partition clamp pieces (2231) has a partition limiting plate (226) at its head. The gap between the two partition clamp pieces (2231) is adjusted by a partition locking screw (227). The partition clamp (222) is also fixedly provided with a cylinder limiting plate (228) at one end adjacent to the partition chuck seat (221).

7. The manufacturing method of the double-ring heat exchanger assembly according to claim 1, characterized in that: The dual-ring heat exchanger manufacturing equipment (2) also includes a frame (242), on which a slide bar (241) is provided. The combined gripper chuck mechanism (21), the partition cylinder chuck mechanism (22), and the variable diameter support rod assembly (23) are all in pairs and are symmetrically arranged relative to the frame (242); The combined gripper chuck mechanism (21) is fixedly installed on the frame (242), and the partition cylinder chuck mechanism (22) is slidably mounted on the slide rod (241).

Images