A feed preheater having a multi-strand spiral flow channel

Abstract

This utility model discloses a feed preheater with multi-strand spiral flow channels, belonging to the technical field of material preheating equipment. The preheater includes a feed pipe with a feeding mechanism featuring spiral blades inside. A jacket is fixed to the outer wall of the feed pipe, and a preheating mechanism is located inside the jacket. The preheating mechanism includes a multi-strand spiral tube surrounding the outer wall of the feed pipe, a main medium inlet, an inlet branch pipe, an outlet branch pipe, and a main medium outlet. The preheating medium enters through the main medium inlet, is evenly distributed to each flow channel of the multi-strand spiral tube through the inlet branch pipe, and after heat exchange, collects at the outlet branch pipe and is discharged through the main medium outlet. This utility model solves the problem of uneven heating caused by a single flow channel in the prior art by using external multi-strand spiral tubes. Simultaneously, it utilizes internal spiral blades to agitate the material and enhance heat transfer. Through synergistic effects, it significantly improves preheating efficiency and temperature uniformity, and the equipment has a compact and reliable structure.

Description

Technical Field

[0001] This utility model relates to the technical field of material preheating equipment, and in particular to a feed preheater with multiple spiral flow channels. Background Technology

[0002] In many industrial production fields such as chemical, food, and building materials, preheating powdery or granular materials is a common pretreatment process. Effective preheating of materials before they enter core reaction or forming equipment can significantly improve the reaction rate, stability, and overall production efficiency of subsequent processes. Currently, a common feed preheating device combines a screw conveyor mechanism with an external heating structure. While the material is propelled forward by the screw blades inside the device, it absorbs external heat through the pipe wall to raise its own temperature.

[0003] In existing technical practices, the external heating structure of such preheaters typically takes the form of a single-layer jacket or a single spiral coil. The heating medium (such as heat transfer oil or steam) flows in a single, narrow channel, transferring its heat to the feed tube.

[0004] However, this single-channel design has an inherent drawback. When the heating medium flows through a long, single channel, its temperature decreases significantly from the inlet to the outlet due to continuous heat exchange with the feed tube. This temperature gradient directly affects the outer wall of the feed tube, resulting in a higher temperature at the feed end and a lower temperature at the discharge end. Consequently, the material inside the feed tube is unevenly heated during transport; material near the inlet may be overheated, while material near the discharge end may be underheated. This severely affects the uniformity and stability of the preheated material temperature, making it difficult to meet the requirements of high-precision production processes.

[0005] Therefore, this utility model proposes a feed preheater with multiple spiral flow channels to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a feed preheater with multiple spiral flow channels, aiming to improve the technical problems of low heat exchange efficiency, uneven material heating, and easy clogging in the feed preheater of the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a feed preheater with multiple spiral flow channels, comprising: a feed pipe, a feed mechanism disposed inside the feed pipe for conveying materials; and a jacket fixed to the outer wall of the feed pipe, and a preheating mechanism disposed inside the jacket.

[0008] The feeding mechanism includes a rotating shaft, spiral blades fixedly connected to the outer periphery of the rotating shaft, and a motor. The rotating shaft is coaxially rotatably disposed inside the material tube, and one end of the motor is drivenly connected to the rotating shaft.

[0009] Furthermore, the preheating mechanism has a structure different from the prior art. The preheating mechanism includes a multi-strand spiral tube, a main medium inlet, an inlet branch pipe, an outlet branch pipe, and a main medium outlet. The multi-strand spiral tube is spirally and tightly fitted to the outer wall of the material pipe; the input end of the inlet branch pipe is fixedly connected to the main medium inlet, and the multiple output ends of the inlet branch pipe are respectively fixedly connected to the input ends of each flow channel of the multi-strand spiral tube; the output ends of each flow channel of the multi-strand spiral tube are respectively fixedly connected to the multiple input ends of the outlet branch pipe, and the output end of the outlet branch pipe is fixedly connected to the main medium outlet.

[0010] Preferably, the feed end of the feed tube is fixedly connected to a feed port, and the discharge end of the feed tube is fixedly connected to a discharge port.

[0011] Preferably, a rotation gap is preset between the outer diameter of the spiral blade and the inner diameter of the feed tube.

[0012] Preferably, the inlet diverter is a hollow tubular structure, and the sidewall of the inlet diverter is provided with a plurality of output ports at intervals equal to the number of flow channels of the multi-strand spiral tube.

[0013] Preferably, the outlet diverter is a hollow tubular structure, and the sidewall of the outlet diverter is provided with a plurality of input ports at intervals equal to the number of flow channels of the multi-strand spiral tube.

[0014] Preferably, the interlayer is a sealed hollow shell structure, and the shell wall of the interlayer has an installation through hole for the medium inlet and the medium outlet to pass through and be sealed and connected.

[0015] Preferably, the output shaft of the motor is connected to the rotating shaft via a coupling.

[0016] Preferably, the feed pipe, the feed inlet, and the discharge outlet are integrally cast from metal materials.

[0017] This utility model has the following beneficial effects: 1. In this utility model, by setting a multi-strand spiral tube around the outside of the material tube, and cooperating with the structure of the inlet diversion tube and the outlet diversion tube, the problem of uneven heat distribution and easy local overheating or insufficient preheating of the material when using single jacket or single coil heating in the prior art is solved. The technical effect of uniformly covering the entire outer wall of the material tube with heat is achieved, thereby realizing the uniform and stable preheating of the material inside the material tube.

[0018] 2. In this utility model, by setting rotating spiral blades inside the material pipe, the problems of material accumulation and blockage during the conveying process and insufficient contact between the material and the heat exchange wall surface leading to low heat exchange efficiency in the prior art are solved. The technical effect of forcibly turning the material while conveying it smoothly is achieved, which greatly increases the contact area and renewal frequency between the material and the heated pipe wall, thereby significantly improving the preheating efficiency. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a feed preheater with multiple spiral flow channels proposed in this utility model; Figure 2 This is a schematic diagram of the feed pipe section of a feed preheater with a multi-strand spiral flow channel proposed in this utility model; Figure 3 This is a schematic diagram of the multi-spiral tube section of a feed preheater with multi-spiral flow channels proposed in this utility model. Figure 4 This is a schematic diagram of the spiral blade section of a feed preheater with multiple spiral flow channels proposed in this utility model.

[0020] Legend: 1. Feeding mechanism; 101. Material pipe; 102. Inlet; 103. Outlet; 104. Motor; 105. Shaft; 106. Spiral blade; 2. Preheating mechanism; 201. Multi-strand spiral tube; 202. Main medium inlet; 203. Inlet branch pipe; 204. Outlet branch pipe; 205. Main medium outlet; 3. Jacket. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please refer to Figures 1 to 4 This utility model provides a feed preheater with a multi-strand spiral flow channel, which aims to solve the technical problems of low heat exchange efficiency, uneven heating of materials, and easy clogging in the feed preheater in the prior art.

[0023] The feed preheater with multiple spiral flow channels includes a feed pipe 101 as the main body of the equipment, a feed mechanism 1 disposed inside the feed pipe 101, a jacket 3 fixed to the outer wall of the feed pipe 101, and a preheating mechanism 2 disposed inside the jacket 3. The material pipe 101 is a hollow tubular structure, serving as the core channel for material flow and heat conduction. The inlet end of the material pipe 101 is fixedly connected to the inlet port 102, and the outlet end of the material pipe 101 is fixedly connected to the outlet port 103. In a preferred embodiment, the material pipe 101, the inlet port 102, and the outlet port 103 are integrally cast from metal materials to enhance the overall strength and sealing performance. The feeding mechanism 1 is set in the internal cavity of the material tube 101. The feeding mechanism 1 includes a rotating shaft 105, a spiral blade 106 and a motor 104. The rotating shaft 105 is coaxially rotatably set in the material tube 101. The spiral blade 106 has a continuous spiral structure. The spiral blade 106 is fixedly connected to the outer periphery of the rotating shaft 105 and rotates synchronously with the rotating shaft 105. There is a preset rotation gap between the outer diameter of the spiral blade 106 and the inner diameter of the material tube 101 to ensure smooth rotation and avoid wear. The motor 104 is used as a power source. The output shaft of the motor 104 is connected to one end of the rotating shaft 105 through a coupling to drive the rotating shaft 105 and the spiral blade 106 to rotate, thereby realizing the conveying and turning of the material inside the material tube 101. The interlayer 3 is fixed to the outer wall of the material pipe 101. The interlayer 3 is a sealed hollow shell structure. The inner wall of the interlayer 3 is fixedly connected to the outer wall of the material pipe 101, thereby forming an independent space outside the material pipe 101 for accommodating the preheating mechanism 2.

[0024] The preheating mechanism 2 includes a multi-strand spiral tube 201, a medium inlet 202, an inlet branch pipe 203, an outlet branch pipe 204, and a medium outlet 205. The multi-strand spiral tube 201 is composed of multiple parallel spiral pipes. The multi-strand spiral tube 201 is arranged in a spiral shape and closely fits the outer wall of the material pipe 101, thereby forming a large area of ​​heat exchange surface. The medium inlet 202 and the medium outlet 205 serve as the main channels for the preheating medium to flow into and out of the entire preheating mechanism 2, respectively. In a specific embodiment, the shell wall of the interlayer 3 is provided with a mounting through hole for the medium inlet 202 and the medium outlet 205 to pass through and be sealed and connected. The input end of the inlet diversion pipe 203 is fixedly connected to the medium inlet 202. The inlet diversion pipe 203 is a hollow tubular structure. Multiple output ports, equal in number to the flow channels of the multi-strand spiral tube 201, are spaced apart on the side wall of the inlet diversion pipe 203. These output ports are fixedly connected to the input ends of each flow channel of the multi-strand spiral tube 201. This structure can evenly distribute the single-path preheating medium entering from the medium inlet 202 into each flow channel of the multi-strand spiral tube 201. The structure of the outlet diversion pipe 204 corresponds to that of the inlet diversion pipe 203. The outlet diversion pipe 204 is also a hollow tubular structure. Multiple input ports, equal in number to the flow channels of the multi-strand spiral tube 201, are spaced apart on the side wall of the outlet diversion pipe 204. These input ports are fixedly connected to the output ends of each flow channel of the multi-strand spiral tube 201, while the output end of the outlet diversion pipe 204 is fixedly connected to the total medium outlet 205. This structure is used to collect the preheated medium flowing out from each flow channel after heat exchange and discharge it uniformly. This "total-diversion-total" flow channel layout, combined with the spirally wound multi-strand spiral tube 201, ensures that the preheated medium can uniformly and fully cover the outer wall of the entire material pipe 101, thereby providing stable and balanced heat to the material pipe 101 and realizing efficient and uniform preheating of the internal material.

[0025] As a preferred embodiment, in order to improve the integrity and pressure resistance of the feed preheater structure, the feed pipe 101, the feed inlet 102 fixedly connected to the feed end of the feed pipe 101, and the discharge outlet 103 fixedly connected to the discharge end of the feed pipe 101 are all made of metal material by integral casting process. This integrated structure reduces welding or connection points and improves the sealing performance and mechanical strength of the equipment. As another preferred embodiment, in order to ensure the smooth and reliable operation of the feeding mechanism 1, the output shaft of the motor 104 is connected to the rotating shaft 105 through a coupling. The coupling can compensate for the axial deviation that may occur during the installation process and play a certain buffering role. At the same time, a reasonable rotation gap is preset between the outer diameter of the spiral blade 106 and the inner diameter of the material tube 101. The design of this gap can prevent the spiral blade 106 from scraping and wearing against the inner wall of the material tube 101 when rotating at high speed, and can also effectively avoid a large amount of material leakage in reverse at the gap, thus ensuring the conveying efficiency. In another preferred embodiment, in order to achieve precise and uniform distribution and recovery of the preheating medium, the inlet diversion pipe 203 is a hollow tubular structure. Multiple output ports are spaced apart along the axial direction on the side wall of the inlet diversion pipe 203. The number of output ports is equal to the number of flow channels of the multi-strand spiral pipe 201. Each output port is connected to the inlet of each flow channel of the multi-strand spiral pipe 201 through an independent pipe. Similarly, the outlet diversion pipe 204 is also a hollow tubular structure. Multiple input ports are spaced apart on the side wall of the outlet diversion pipe 204. Each input port is connected to the outlet of each flow channel of the multi-strand spiral pipe 201 to efficiently collect the medium after heat exchange. As another preferred embodiment, in order to ensure the stable operation of the preheating mechanism 2 and good heat preservation effect, the interlayer 3 is made into a sealed hollow shell structure. The shell completely covers all components of the preheating mechanism 2, especially the multi-strand spiral tube 201, and isolates them from the outside. The shell wall of the interlayer 3 is provided with an installation through hole. The medium inlet 202 and the medium outlet 205 pass through and are sealed to the installation through hole. The connection method can be welding or flange sealing to eliminate any risk of leakage of the preheating medium.

[0026] Working principle: When the material needs to be preheated, the material enters the material pipe 101 through the feed port 102. Then the motor 104 starts and drives the rotating shaft 105 to rotate through the coupling. This drives the spiral blades 106 fixedly connected to the outer circumference of the rotating shaft 105 to rotate synchronously. During the rotation, the spiral blades 106 push the material along the axial direction of the material pipe 101 from the feed port 102 to the discharge port 103. At the same time, they continuously tumble and stir the material. Through centrifugal action, the material particles can fully and tightly contact the inner wall of the material pipe 101. Finally, the preheated material is discharged from the discharge port 103. While the material is being conveyed, the high-temperature preheating medium enters the preheating mechanism 2 from the medium inlet 202 and then flows into the inlet branch pipe 203. The inlet branch pipe 203 evenly distributes the single stream of preheating medium into each parallel channel of the multi-strand spiral tube 201. The preheating medium spirals inside the multi-strand spiral tube 201, which is tightly attached to the outer wall of the material tube 101. It efficiently conducts heat to the material tube 101 through the tube wall. After the heat exchange is completed, the preheating medium with a reduced temperature collects from the outlet of each channel of the multi-strand spiral tube 201 to the outlet branch pipe 204, and finally exits the equipment from the medium outlet 205. The forced turning action of the spiral blades 106 in the feeding mechanism 1 ensures that the material inside the feed tube 101 is always in a dynamic mixing state, continuously updating the material layer that exchanges heat with the inner wall of the feed tube 101. The structure of the multi-strand spiral tube 201 in the preheating mechanism 2 ensures that heat can be evenly applied to the entire outer surface of the feed tube 101. Through this combination of forced dynamic contact of the internal material and uniform and stable supply of external heat source, a rapid and uniform temperature increase of the material is achieved throughout the entire conveying process.

Claims

1. A feed preheater with a multi-strand spiral flow channel, comprising a feed pipe (101) and a feed mechanism (1) disposed inside the feed pipe (101) for conveying materials; characterized in that, The feed preheater also includes a jacket (3) fixed to the outer wall of the feed pipe (101) and a preheating mechanism (2) disposed inside the jacket (3). The feeding mechanism (1) includes a rotating shaft (105) and a spiral blade (106) fixedly connected to the outer periphery of the rotating shaft (105). The rotating shaft (105) is rotatably and coaxially arranged in the feed tube (101). One end of the rotating shaft (105) is driven by a motor (104). The preheating mechanism (2) includes a multi-strand spiral tube (201), a medium inlet (202), an inlet branch pipe (203), an outlet branch pipe (204), and a medium outlet (205). The multi-strand spiral tube (201) is spirally and tightly fitted to the outer wall of the material pipe (101). The input end of the inlet branch pipe (203) is fixedly connected to the medium inlet (202), and the multiple output ends of the inlet branch pipe (203) are fixedly connected to the input ends of each flow channel of the multi-strand spiral tube (201). The output ends of each flow channel of the multi-strand spiral tube (201) are fixedly connected to the multiple input ends of the outlet branch pipe (204), and the output end of the outlet branch pipe (204) is fixedly connected to the medium outlet (205).

2. A feed preheater with a multi-spiral flow channel according to claim 1, characterized in that: The feed end of the feed tube (101) is fixedly connected to the feed port (102), and the discharge end of the feed tube (101) is fixedly connected to the discharge port (103).

3. A feed preheater with a multi-strand spiral flow channel according to claim 1, characterized in that: A rotation gap is pre-set between the outer diameter of the spiral blade (106) and the inner diameter of the feed tube (101).

4. A feed preheater with a multi-strand spiral flow channel according to claim 1, characterized in that: The inlet diverter (203) is a hollow tubular structure, and multiple output ports, equal in number to the flow channels of the multi-strand spiral tube (201), are spaced apart on the side wall of the inlet diverter (203).

5. A feed preheater with a multi-strand spiral flow channel according to claim 1, characterized in that: The outlet diverter pipe (204) is a hollow tubular structure, and multiple input ports, equal in number to the flow channels of the multi-strand spiral pipe (201), are spaced apart on the side wall of the outlet diverter pipe (204).

6. A feed preheater with a multi-strand spiral flow channel according to claim 1, characterized in that: The interlayer (3) is a sealed hollow shell structure. The shell wall of the interlayer (3) is provided with an installation through hole for the medium inlet (202) and the medium outlet (205) to pass through and be sealed and connected.

7. A feed preheater with a multi-strand spiral flow channel according to claim 1, characterized in that: The output shaft of the motor (104) is connected to the rotating shaft (105) via a coupling.

8. A feed preheater with a multi-strand spiral flow channel according to claim 2, characterized in that: The feed pipe (101), the feed inlet (102), and the discharge outlet (103) are integrally cast from metal materials.

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