Backflushing descaling heat exchanger

Abstract

This utility model relates to the field of heat exchanger technology, specifically a backflushing descaling heat exchanger. It includes a heat exchanger body, a material inlet pipe, a material outlet pipe, a water inlet pipe, a water outlet pipe, and a backflushing assembly. The material inlet pipe is fixedly connected to the left and right ends of the heat exchanger body. The water inlet pipe is fixedly connected to the lower side of the heat exchanger body, and the water outlet pipe is fixedly connected to the upper side. This utility model has a reasonable and compact structure and is easy to use. The material to be cooled enters the heat exchanger body through the material inlet pipe and exits through the material outlet pipe. Cooling water enters the heat exchanger body through the water inlet pipe and exits through the water outlet pipe, thereby achieving heat exchange between the material and the cooling water to reduce the material temperature. By setting up the backflushing assembly, the cleaning agent enters from the material outlet pipe and exits from the water outlet pipe, completing the descaling operation on the inner wall of the heat exchanger tubes, the outer wall of the heat exchanger tubes, and the inner wall of the heat exchanger shell. It features stability, reliability, and high efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology and is a backflushing descaling heat exchanger. Background Technology

[0002] Heat exchangers, as core equipment for industrial heat transfer, perform key process functions such as heating, cooling, and evaporation in fields such as chemical, petroleum, energy, and food industries, through structural forms such as indirect-flow, hybrid, or regenerative types. Their working principle is based on heat conduction, convection, and radiation heat transfer mechanisms, achieving heat exchange through counter-current or co-current contact of fluids within specific flow channels. While existing mainstream structures such as shell-and-tube, plate, and spiral coil types can meet basic requirements, they generally face common challenges such as scaling, corrosion, and thermal stress.

[0003] Existing heat exchangers generally employ an independent channel design, leading to the simultaneous formation of dense scale layers on both the inner and outer surfaces of the tubes by both hot and cold fluids, significantly reducing heat transfer efficiency. Traditional cleaning methods require complete disassembly of the equipment for mechanical scraping or chemical soaking, but these methods have a double drawback: firstly, the disassembly process easily damages the sealing structure, increasing the risk of leakage; secondly, frequent shutdowns cause production continuity interruptions, especially in continuous production scenarios such as oil refining and pharmaceuticals, where maintenance cycles severely conflict with process requirements. Although existing technologies have attempted to delay scaling through fluoroplastic coatings, spiral baffles, or ultrasonic scaling inhibition, these solutions are still limited by high material costs (such as titanium alloys), increased structural complexity (such as etched plates), or narrow applicable operating conditions (such as low-temperature environments), making it difficult to meet the long-term stable operation requirements of complex conditions such as multiphase flow and high temperature and pressure. Summary of the Invention

[0004] This invention provides a backflushing descaling heat exchanger that overcomes the shortcomings of the prior art and effectively solves the problem that the heat exchange tubes in existing heat exchangers cannot be cleaned to form a dense scale layer on their inner and outer surfaces.

[0005] The technical solution of this utility model is achieved through the following measures: A backflushing descaling heat exchanger includes a heat exchanger body, a material inlet pipe, a material outlet pipe, a water inlet pipe, a water outlet pipe, and a backflushing assembly. The left end of the heat exchanger body is fixedly connected to the material inlet pipe, the right end of the heat exchanger body is fixedly connected to the material inlet pipe, the lower side of the heat exchanger body is fixedly connected to the water inlet pipe, and the upper side of the heat exchanger body is fixedly connected to the water outlet pipe. The backflushing assembly includes a connecting pipe, a left one-way valve assembly, a right one-way valve assembly, a left linkage plug, and a right linkage plug. A connecting pipe is fixedly connected between the material inlet pipe and the water inlet pipe. The pipe is L-shaped, with the upper end of the connecting pipe located inside the material inlet pipe and the right end of the connecting pipe located inside the water inlet pipe. A left one-way valve assembly is installed in the material inlet pipe corresponding to the right position of the connecting pipe, and a left linkage plug is installed at the upper end of the connecting pipe. The left linkage plug can seal the connecting pipe when the left one-way valve assembly is opened and can release the seal when the left one-way valve assembly is closed. A right one-way valve assembly is installed in the water inlet pipe corresponding to the lower position of the connecting pipe, and a right linkage plug is installed at the right end of the connecting pipe. The right linkage plug can seal the connecting pipe when the right one-way valve assembly is opened and can release the seal when the right one-way valve assembly is closed.

[0006] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0007] The aforementioned left-side one-way valve assembly may include a first piston, a first sealing plate, a first connecting rod, a first spring, a first limiting ring, and a second limiting ring. The first and second limiting rings are spaced apart on the inner left side of the material inlet pipe. A first piston, capable of moving left and right within the material inlet pipe, is located between the first and second limiting rings. A first sliding hole, penetrating left and right, is located in the center of the first piston. A first connecting rod is installed within the first sliding hole. A first sealing plate, located between the first piston and the second limiting ring, is fixedly mounted on the right end of the first connecting rod. The first piston has several first flow holes penetrating left and right. A first limiting ring platform is provided on the outer side of the left end of the first connecting rod, and a first spring is provided on the outer side of the first connecting rod corresponding to the position between the first limiting ring platform and the first piston; the right one-way valve assembly includes a second piston, a second sealing plate, a second connecting rod, a second spring, a third limiting ring, and a fourth limiting ring. The lower inner side of the water inlet pipe is provided with a third limiting ring and a fourth limiting ring spaced vertically. A second piston that can move vertically within the water inlet pipe is provided between the third limiting ring and the fourth limiting ring. A second sliding hole that passes vertically through the center of the second piston is provided. A second connecting rod is provided inside the second sliding hole. A second sealing plate located between the second piston and the fourth limiting ring is fixedly installed on the upper end of the second connecting rod. Several second flow holes that pass vertically through the second piston are provided on the second piston. A second limiting ring platform is provided on the outer side of the lower end of the second connecting rod, and a second spring is provided on the outer side of the second connecting rod corresponding to the position between the second limiting ring platform and the second piston.

[0008] The aforementioned left linkage plug may include a first plug and a first telescopic rod. The first plug is provided on the inner side of the upper end of the connecting pipe, and the two ends of the first telescopic rod are respectively hinged to the first plug and the first sealing plate. The right linkage plug includes a second plug and a second telescopic rod. The second plug is provided on the inner side of the right end of the connecting pipe, and the two ends of the second telescopic rod are respectively hinged to the second plug and the second sealing plate.

[0009] The heat exchanger body may include a heat exchanger shell, a left sealing plate, a right sealing plate, and heat exchange tubes. The heat exchanger shell is provided with a left sealing plate and a right sealing plate spaced apart on the left and right sides. The left sealing plate is located to the left of the water outlet pipe, and the right sealing plate is located to the right of the water inlet pipe. The left sealing plate is provided with several left mounting holes, and the right sealing plate is provided with a right mounting hole corresponding to each left mounting hole position. A heat exchange tube is fixedly installed between each pair of corresponding left mounting holes and right mounting holes. The heat exchange tubes are all spirally arranged coils.

[0010] The above may also include flange rings, with flange rings provided on the outer side of the left end of the material inlet pipe, the outer side of the right end of the material outlet pipe, the outer side of the lower end of the water inlet pipe, and the outer side of the upper end of the water outlet pipe.

[0011] This utility model has a reasonable and compact structure and is easy to use. The material to be cooled enters the heat exchanger body through the material inlet pipe and exits through the material outlet pipe. Cooling water enters the heat exchanger body through the water inlet pipe and exits through the water outlet pipe, thereby realizing heat exchange between the material and the cooling water to reduce the temperature of the material. By setting a backflushing component, the cleaning agent enters from the material outlet pipe and exits from the water outlet pipe, completing the descaling operation on the inner wall of the heat exchange tube, the outer wall of the heat exchange tube, and the inner wall of the heat exchanger shell. It has the characteristics of stability, reliability and high efficiency. Attached Figure Description

[0012] Appendix Figure 1 This is a three-dimensional structural diagram of embodiments 1 to 5 of this utility model.

[0013] Appendix Figure 2 This is a three-dimensional cross-sectional structural diagram of embodiments 1 to 5 of this utility model.

[0014] Appendix Figure 3 For the appendix Figure 1 A three-dimensional structural diagram of the recoil assembly.

[0015] The codes in the attached diagram are as follows: 1 is the heat exchanger body, 2 is the material inlet pipe, 3 is the material outlet pipe, 4 is the water inlet pipe, 5 is the water outlet pipe, 6 is the left sealing plate, 7 is the right sealing plate, 8 is the heat exchange tube, 9 is the connecting pipe, 10 is the first piston, 11 is the first sealing plate, 12 is the first connecting rod, 13 is the first spring, 14 is the first limiting ring, 15 is the second limiting ring, 16 is the first plug, 17 is the first telescopic rod, 18 is the right one-way valve assembly, 19 is the right linkage plug, and 20 is the flange. Detailed Implementation

[0016] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0017] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0018] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0019] Example 1: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the backflushing descaling heat exchanger includes a heat exchanger body 1, a material inlet pipe 2, a material outlet pipe 3, a water inlet pipe 4, a water outlet pipe 5, and a backflushing assembly. The material inlet pipe 2 is fixedly connected to the left end and the right end of the heat exchanger body 1. The water inlet pipe 4 is fixedly connected to the lower side of the heat exchanger body 1, and the water outlet pipe 5 is fixedly connected to the upper side of the heat exchanger body 1. The backflushing assembly includes a connecting pipe 9, a left one-way valve assembly, a right one-way valve assembly 18, a left linkage plug, and a right linkage plug 19. The connecting pipe 9 is L-shaped and is fixedly connected between the material inlet pipe 2 and the water inlet pipe 4. The upper end is located inside the material inlet pipe 2, and the right end of the connecting pipe 9 is located inside the water inlet pipe 4; a left one-way valve assembly is provided in the material inlet pipe 2 corresponding to the right position of the connecting pipe 9, and a left linkage plug is provided at the upper end of the connecting pipe 9. The left linkage plug can block the connecting pipe 9 when the left one-way valve assembly is opened and can release the blockage of the connecting pipe 9 when the left one-way valve assembly is closed; a right one-way valve assembly 18 is provided in the water inlet pipe 4 corresponding to the lower position of the connecting pipe 9, and a right linkage plug 19 is provided at the right end of the connecting pipe 9. The right linkage plug 19 can block the connecting pipe 9 when the right one-way valve assembly 18 is opened and can release the blockage of the connecting pipe 9 when the right one-way valve assembly 18 is closed. During use, the material to be cooled enters the heat exchanger body 1 through the material inlet pipe 2 and exits through the material outlet pipe 3. Cooling water enters the heat exchanger body 1 through the water inlet pipe 4 and exits through the water outlet pipe 5, thereby achieving heat exchange between the material and the cooling water to reduce the temperature of the material. By setting up a backflushing component, the cleaning agent enters from the material outlet pipe 3 and exits from the water outlet pipe 5, completing the descaling operation on the inner wall of the heat exchange tube 8, the outer wall of the heat exchange tube 8, and the inner wall of the heat exchanger shell, effectively solving the problem that the heat exchange tube 8 in the existing heat exchanger cannot be cleaned to form a dense scale layer on the inner and outer surfaces.

[0020] In addition, the material outlet pipe 3 is connected to the material storage equipment, the material inlet pipe 2 is connected to the material outlet equipment, the cooling water inlet pipe is connected to the water inlet pipe 4, and the cooling water outlet pipe is connected to the water outlet pipe 5. The material to be cooled enters the heat exchanger body 1 through the material inlet pipe 2 and exits through the material outlet pipe 3. The cooling water enters the heat exchanger body 1 through the water inlet pipe 4 and exits through the water outlet pipe 5, thereby achieving heat exchange between the material and the cooling water to reduce the temperature of the material. During the descaling operation, the material outlet pipe 3 is connected to the cleaning agent outlet pipe, and the cleaning agent enters the heat exchanger body 1 through the material outlet pipe 3. After passing through the heat exchanger shell, the cleaning agent flows through each heat exchange tube 8 to clean the inner wall of each heat exchange tube 8. Then the cleaning agent flows into the material inlet pipe 2. At this time, under the action of the left one-way valve assembly, the cleaning agent cannot be discharged from the material inlet pipe 2. Under the action of the left linkage plug, the cleaning agent enters the connecting pipe and flows to the water inlet pipe 4. Under the action of the right one-way valve assembly 18, the cleaning agent cannot be discharged from the water inlet pipe 4. Under the action of the right linkage plug 19, the cleaning agent enters the heat exchanger body 1 and flows to the water outlet pipe 5 to achieve the scale removal work on the inner wall of the heat exchanger shell and the outer wall of the heat exchange tube 8.

[0021] The above-mentioned backflushing and descaling heat exchanger can be further optimized and / or improved according to actual needs:

[0022] Example 2: As shown in the attached document Figure 1 , 2As shown in Figure 3, the left one-way valve assembly includes a first piston 10, a first sealing plate 11, a first connecting rod 12, a first spring 13, a first limiting ring 14, and a second limiting ring 15. The first limiting ring 14 and the second limiting ring 15 are spaced apart on the inner left side of the material inlet pipe 2. A first piston 10, capable of moving left and right within the material inlet pipe 2, is positioned between the first limiting ring 14 and the second limiting ring 15. A first sliding hole, penetrating left and right, is located in the center of the first piston 10. A first connecting rod 12 is installed within the first sliding hole. A first sealing plate 11, located between the first piston 10 and the second limiting ring 15, is fixedly installed at the right end of the first connecting rod 12. The first piston 10 has several first flow holes penetrating left and right. A first limiting ring 14 is provided on the outer side of the left end of the first connecting rod 12. A first spring 13 is provided on the outer side of the first connecting rod 12 corresponding to the position between the first limiting ring 14 and the first piston 10. The right one-way valve assembly 18 includes a second piston, a second sealing plate, a second connecting rod, a second spring, a third limiting ring, and a fourth limiting ring. The lower inner side of the water inlet pipe 4 is provided with a third limiting ring and a fourth limiting ring spaced vertically. A second piston that can move vertically within the water inlet pipe 4 is provided between the third limiting ring and the fourth limiting ring. A second sliding hole that passes vertically through the center of the second piston is provided. A second connecting rod is provided within the second sliding hole. A second sealing plate located between the second piston and the fourth limiting ring is fixedly installed on the upper end of the second connecting rod. Several second flow holes that pass vertically through the second piston are provided on the second piston. A second limiting ring 15 is provided on the outer side of the lower end of the second connecting rod. A second spring is provided on the outer side of the second connecting rod corresponding to the position between the second limiting ring 15 and the second piston. During use, this arrangement prevents the cleaning agent from flowing out from the material inlet pipe 2 and the water inlet pipe 4.

[0023] Example 3: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the left linkage plug includes a first plug 16 and a first telescopic rod 17. The first plug 16 is located on the inner side of the upper end of the connecting pipe 9, and the two ends of the first telescopic rod 17 are hinged to the first plug 16 and the first sealing plate 11, respectively. The right linkage plug 19 includes a second plug and a second telescopic rod. The second plug is located on the inner side of the right end of the connecting pipe 9, and the two ends of the second telescopic rod are hinged to the second plug and the second sealing plate, respectively. During use, this design prevents the cleaning agent from flowing out of the material inlet pipe 2 and the water inlet pipe 4.

[0024] Example 4: As shown in the appendix Figure 1 , 2As shown in Figure 3, the heat exchanger body 1 includes a heat exchanger shell, a left sealing plate 6, a right sealing plate 7, and heat exchange tubes 8. The left sealing plate 6 and right sealing plate 7 are spaced apart on the left and right sides inside the heat exchanger shell. The left sealing plate 6 is located to the left of the outlet pipe 5, and the right sealing plate 7 is located to the right of the inlet pipe 4. The left sealing plate 6 has several left mounting holes, and the right sealing plate 7 has a right mounting hole corresponding to each left mounting hole. A heat exchange tube 8 is fixedly installed between each pair of corresponding left and right mounting holes. All heat exchange tubes 8 are spirally arranged coils. During use, the material to be cooled enters through the material inlet pipe 2, flows through the heat exchange tubes 8 to the right of the right sealing plate 7 under the obstruction of the left sealing plate 6, and then exits through the material outlet pipe 3. During this process, cooling water enters the heat exchanger shell through the inlet pipe 4 and exits through the outlet pipe 5, thereby achieving heat exchange between the material and the cooling water to reduce the temperature of the material. In addition, the heat exchange tube 8 adopts a spiral coil, which can significantly improve heat exchange efficiency through a unique spiral flow channel structure. The geometry of the spiral coil forces the fluid to form a strong turbulent state during the flow process, which enhances the contact area between the fluid and the tube wall and the disturbance effect, thereby strengthening the convective heat transfer performance. The spiral winding structure effectively extends the fluid path, making heat transfer more complete, while reducing local temperature difference stress and avoiding the deformation problem caused by temperature difference in traditional straight tubes. In addition, the self-cleaning characteristics of the spiral coil can inhibit the deposition of dirt, and the centrifugal force causes the particulate matter to be discharged with the fluid, reducing the maintenance frequency and extending the equipment life.

[0025] Example 5: As shown in the attached document Figure 1 , 2 As shown in Figures 1 and 3, flange rings are also included. Flange rings are provided on the outer left end of the material inlet pipe 2, the outer right end of the material outlet pipe 3, the outer lower end of the water inlet pipe 4, and the outer upper end of the water outlet pipe 5. During use, by installing flange rings, the pipes are fixed together via flange connections. This allows for a stable mechanical connection through bolt fasteners, ensuring the sealing and pressure resistance between the pipes and equipment. It adapts to high-temperature, high-pressure, and corrosive media environments, effectively preventing fluid leakage and ensuring the safe operation of the system.

[0026] The above technical features constitute the preferred embodiment of this utility model, which has strong adaptability and the best implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0027] In the heat exchange process of this utility model: when the material is conveyed into the material inlet pipe 2, the first piston 10 is first pushed to move to the right until the first piston 10 abuts against the second limiting ring 15. Subsequently, the material pressure rises, pushing the first sealing plate 11 away from the first piston 10, so that the material can enter the heat exchanger shell through the first flow hole provided on the first piston 10. During this process, the movement of the first piston 10 drives the first plug 16 to move through the first telescopic rod 17, so that the first plug 16 seals the upper end of the connecting pipe 9. Similarly, when the cooling water enters the water inlet pipe 4, the second plug will also seal the right end of the connecting pipe 9, thereby achieving that the material and the cooling water do not come into contact during the cooling process.

[0028] In the descaling process of this utility model: the material outlet pipe 3 and the cleaning agent output pipe are connected. After the cleaning agent enters the heat exchanger shell through the material outlet pipe 3, it passes through each heat exchange tube 8 under the action of the right sealing plate 7 to clean the inner wall of each heat exchange tube 8. Then the cleaning agent flows to the left of the left sealing plate 6 and enters the material inlet pipe 2. At this time, under the action of the first spring 13, the first sealing plate 11 is pressed against the right side of the first piston 10 and blocks the first flow hole, and pushes the first piston 10 to move to the left. During this process, when the first piston 10 moves to the left, it drives the first plug 16 to move upward through the first telescopic rod 17, so that the first plug 16 no longer blocks the upper end of the connecting pipe 9, so that the cleaning agent can enter the connecting pipe and flow to the water inlet pipe 4. Similarly, the second sealing plate in the water inlet pipe 4 will seal the second piston, so that the cleaning agent can enter the heat exchanger shell through the upper end of the water inlet pipe 4 to clean the inner wall of the heat exchanger shell and the outer wall of the heat exchange tube 8. After that, the cleaning agent is output through the water outlet pipe 5.

Claims

1. A backflushing descaling heat exchanger, characterized in that... The system includes a heat exchanger body, a material inlet pipe, a material outlet pipe, a water inlet pipe, a water outlet pipe, and a backflushing assembly. The material inlet pipe is fixedly connected to the left and right ends of the heat exchanger body. A water inlet pipe is fixedly connected to the lower side of the heat exchanger body, and a water outlet pipe is fixedly connected to the upper side of the heat exchanger body. The backflushing assembly includes a connecting pipe, a left one-way valve assembly, a right one-way valve assembly, a left linkage plug, and a right linkage plug. A connecting pipe, L-shaped, is fixedly connected between the material inlet pipe and the water inlet pipe, with its upper end located at the material inlet pipe. Inside the pipe, the right end of the connecting pipe is located inside the water inlet pipe; a left one-way valve assembly is installed in the material inlet pipe corresponding to the right position of the connecting pipe, and a left linkage plug is installed at the upper end of the connecting pipe. The left linkage plug can block the connecting pipe when the left one-way valve assembly is opened and can release the blockage when the left one-way valve assembly is closed; a right one-way valve assembly is installed in the water inlet pipe corresponding to the lower position of the connecting pipe, and a right linkage plug is installed at the right end of the connecting pipe. The right linkage plug can block the connecting pipe when the right one-way valve assembly is opened and can release the blockage when the right one-way valve assembly is closed.

2. The backflushing descaling heat exchanger according to claim 1, characterized in that... The left-side one-way valve assembly includes a first piston, a first sealing plate, a first connecting rod, a first spring, a first limiting ring, and a second limiting ring. The first and second limiting rings are spaced apart on the inner left side of the material inlet pipe. A first piston, capable of moving left and right within the material inlet pipe, is located between the first and second limiting rings. A first sliding hole, penetrating left and right, is located in the center of the first piston. A first connecting rod is installed within the first sliding hole. A first sealing plate, located between the first piston and the second limiting ring, is fixedly mounted on the right end of the first connecting rod. The first piston has several first flow holes penetrating left and right. A first limiting ring platform is provided on the outer side of the left end of the first connecting rod, and a first spring is provided on the outer side of the first connecting rod corresponding to the position between the first limiting ring platform and the first piston; the right one-way valve assembly includes a second piston, a second sealing plate, a second connecting rod, a second spring, a third limiting ring, and a fourth limiting ring. The lower inner side of the water inlet pipe is provided with a third limiting ring and a fourth limiting ring spaced vertically. A second piston that can move vertically within the water inlet pipe is provided between the third limiting ring and the fourth limiting ring. A second sliding hole that passes vertically through the center of the second piston is provided. A second connecting rod is provided inside the second sliding hole. A second sealing plate located between the second piston and the fourth limiting ring is fixedly installed on the upper end of the second connecting rod. Several second flow holes that pass vertically through the second piston are provided on the second piston. A second limiting ring platform is provided on the outer side of the lower end of the second connecting rod, and a second spring is provided on the outer side of the second connecting rod corresponding to the position between the second limiting ring platform and the second piston.

3. The backflushing descaling heat exchanger according to claim 2, characterized in that... The left linkage plug includes a first plug and a first telescopic rod. The first plug is provided on the inner side of the upper end of the connecting pipe, and the two ends of the first telescopic rod are respectively hinged to the first plug and the first sealing plate. The right linkage plug includes a second plug and a second telescopic rod. The second plug is provided on the inner side of the right end of the connecting pipe, and the two ends of the second telescopic rod are respectively hinged to the second plug and the second sealing plate.

4. The backflushing descaling heat exchanger according to claim 1, 2, or 3, characterized in that... The heat exchanger body includes a heat exchanger shell, a left sealing plate, a right sealing plate, and heat exchange tubes. The left and right sealing plates are spaced apart inside the heat exchanger shell. The left sealing plate is located to the left of the outlet pipe, and the right sealing plate is located to the right of the inlet pipe. The left sealing plate has several left mounting holes, and the right sealing plate corresponding to each left mounting hole has a right mounting hole. A heat exchange tube is fixedly installed between each pair of corresponding left and right mounting holes. All heat exchange tubes are spirally arranged coils.

5. The backflushing descaling heat exchanger according to claim 1, 2, or 3, characterized in that... It also includes flange rings, which are provided on the outer side of the left end of the material inlet pipe, the outer side of the right end of the material outlet pipe, the outer side of the lower end of the water inlet pipe, and the outer side of the upper end of the water outlet pipe.

6. The backflushing descaling heat exchanger according to claim 4, characterized in that... It also includes flange rings, which are provided on the outer side of the left end of the material inlet pipe, the outer side of the right end of the material outlet pipe, the outer side of the lower end of the water inlet pipe, and the outer side of the upper end of the water outlet pipe.

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