A jam boiling apparatus

Abstract

The present application relates to the technical field of food processing machinery, and discloses a jam boiling device, which comprises a mounting platform, an inner layer tank arranged on the mounting platform, an outer layer jacket arranged outside the inner layer tank, a main shaft transversely arranged inside the inner layer tank, and a motor arranged on the mounting platform and used for driving the main shaft to rotate, wherein the inside of the main shaft is coaxially sleeved with an inner layer pipe; one end of the main shaft is connected with a central distribution valve block, an hourglass-shaped cavity is arranged in the central distribution valve block, the hourglass-shaped cavity has a narrowest throat part, and the narrowest throat part is connected with one end of the inner layer pipe. By arranging the central distribution valve block at the end of the main shaft, the physical suction effect of the drainage channel connected with the heat exchange pipe network is exerted by the extremely strong dynamic pressure and negative pressure generated when the power steam flows through the narrowest throat part, so that the internal condensate accumulation defect of the existing horizontal rotary heating coil pot which inevitably occurs due to the simple reliance on gravity and rear-end air pressure drainage is solved.

Description

Technical Field

[0001] This invention relates to the field of food processing machinery technology, specifically to a jam cooking device. Background Technology

[0002] In the cooking process of high-viscosity materials such as jams, uniform heating and internal moisture control are crucial to product quality. Currently, conventional cooking equipment typically uses vertical mixing tanks with bottom and side heating jackets. However, due to the significant hydrostatic pressure differences within the vertical tank structure, the buoyancy of the fruit pulp often exceeds the weight at the bottom, easily causing large areas of pulp to float and form stratification. Simultaneously, when processing the evaporated water, condensate typically drips directly from the top of the tank onto the material surface, resulting in excessively high moisture content in the surface layer while the bottom layer, lacking sufficient water for effective dilution, is prone to scorching, making it difficult to achieve deep and uniform mixing of the condensate within the highly viscous material.

[0003] To improve the macroscopic tumbling effect of materials, horizontal mixing equipment is used for cooking operations in some processing scenarios. Conventional horizontal single-shaft double-ribbon equipment mainly relies on the jacket of the external tank for heating, and its central main shaft and propulsion ribbon are mostly solid and have no heating function. When processing high-viscosity materials, the heat transfer efficiency in the central area far from the outer jacket is low, easily forming a heat exchange dead zone. To address this, some advanced equipment uses a rotary heating structure with steam introduced into the main shaft and peripheral coils to increase the heating area in the central region. However, when the heating coils rotate in extremely viscous materials, the material easily adheres to the coils and rotates with the entire tube bundle, causing the equipment to lose its ability to disperse and convectively mix the material.

[0004] Furthermore, the horizontal rotary heating coil structure faces an inherent engineering flaw in actual operation. After steam releases heat inside the coil, it produces a large amount of condensate. Due to the periodic positional influence of the rotational motion, condensate easily accumulates in the lower half of the coil. Existing drainage structures typically rely solely on the gravity of the condensate and the pressure of the steam behind it to transport the liquid outwards. This method cannot completely drain the water from low-lying areas when dealing with complex rotating pipe networks. The accumulated liquid water inside the pipes not only hinders the flow of subsequent steam and significantly reduces the heat exchange efficiency of the pipe walls, but also easily leads to steam-water blockage and fluid impact, causing unstable equipment operation and even mechanical damage to the pipe structure. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a jam cooking apparatus that solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a jam cooking device, comprising a mounting platform, an inner tank disposed on the mounting platform, an outer jacket sleeved outside the inner tank, a main shaft transversely passing through the inner tank, and a motor mounted on the mounting platform for driving the main shaft to rotate; The main shaft is coaxially fitted with an inner tube. One end of the main shaft is connected to a central distribution valve block. The central distribution valve block has an hourglass-shaped cavity inside. The hourglass-shaped cavity has a narrowest throat. The narrowest throat is connected to one end of the inner tube. It is used to generate negative pressure when gas flows through the narrowest throat to draw the fluid in the inner tube.

[0007] Preferably, an air intake chamber is formed between the inner sidewall of the main shaft and the outer sidewall of the inner tube. Multiple sets of heat exchange components are arranged circumferentially and axially on the outer sidewall of the main shaft. Each set of heat exchange components includes two radial branch pipes and an arc-shaped coil. One end of the two radial branch pipes is respectively connected to both ends of the same arc-shaped coil. The multiple heat exchange components include a first heat exchange group and a second heat exchange group. The other ends of the two radial branches in the first heat exchange group are connected to the air inlet chamber. The second heat exchange group is arranged on the side close to the main shaft and away from the central distribution valve block. The other end of one of the radial branches in the second heat exchange group is connected to the air inlet chamber, and the other end of the other radial branch passes through the main shaft and is connected to the interior of the inner tube.

[0008] Preferably, the central distribution valve block is fitted with a rotary joint two installed on the outside of the outer jacket. The inner sidewall of the rotary joint two is provided with an air intake annular groove and a return annular groove. The central distribution valve block is also provided with an air intake channel and a drainage channel. The two ends of the air intake channel are respectively connected to the air intake annular groove and the air intake chamber. The hourglass-shaped cavity has a first end and a second end, the first end being the air inlet and the second end being the drain end. One end of the drain channel is connected to the inner tube, and the other end is connected to the narrowest throat. The drain end is connected to the interior of the return annular groove through a return channel.

[0009] Preferably, the outer shell of the rotary joint two is provided with a main air intake port, a secondary air intake port and a return port, the main air intake port is connected to the air intake annular groove, the secondary air intake port is connected to the air intake end, and the return port is connected to the return annular groove.

[0010] Preferably, a closed cavity is formed between the outer jacket and the inner tank, the outer side wall of the outer jacket is provided with a jacket air inlet and a jacket exhaust port, and the top of the inner tank is connected to a feed pipe.

[0011] Preferably, the device further includes an external thermal circulation system, which includes a steam boiler, a pressure reducing and stabilizing valve, and a filter connected in sequence by pipelines. The exhaust end of the filter is connected to the main air inlet, the auxiliary air inlet, and the jacket air inlet, respectively. The return port and the jacket exhaust port are both connected to an external water tank, which is connected to the water inlet of the steam boiler via a water pump.

[0012] Preferably, spirally extending auger blades are fixedly arranged on the outer side wall of the main shaft, and multiple radial branches connected to an arc-shaped coil are distributed on the side wall of the main shaft. A spiral scraper is fixedly connected to the outer side wall of the arc-shaped coil away from the main shaft, and the spiral direction of the spiral scraper is opposite to that of the auger blades.

[0013] Preferably, a rotary joint is installed at the end of the main shaft away from the central distribution valve block, and the output end of the motor is connected to the main shaft through the rotary joint. A fin with a drain hole is installed on the outer wall of one of the radial branches of each heat exchange assembly. A capillary tube is attached to the outer wall of the main shaft, one end of the capillary tube is connected to the internal flow channel of the rotary joint, and the other end of the capillary tube is connected to the drain hole.

[0014] Preferably, the top of the inner tank is provided with an exhaust port, and the device further includes a condenser pipe and a condenser return pipe connected to the exhaust port. A spare interface is provided on the outside of the rotary joint one. The liquid inlet end of the condenser return pipe is connected to the condenser pipe, and the liquid outlet end of the condenser return pipe passes through the outer jacket and is connected to the interior of the inner tank. Alternatively, the liquid outlet end of the condenser return pipe is connected to the spare interface and is connected to the capillary tube through the internal flow channel of the rotary joint one.

[0015] Preferably, the vane has a streamlined cross-section or a streamlined flat plate added to the back ridge. The vane has a back flow surface and a trailing edge. The drain hole is opened on the back flow surface or the trailing edge. The vane is movably mounted on the radiation branch pipe by a torsion spring; or the vane is rigidly fixed on the radiation branch pipe.

[0016] This invention provides a jam-cooking apparatus. It has the following beneficial effects: 1. This invention solves the problems of condensate buildup, steam blockage, and water hammer in existing horizontal rotary heating coil boilers that inevitably rely on gravity and rear-end air pressure for drainage. The invention also solves the problems of condensate buildup, steam blockage, and water hammer in pipelines caused by relying solely on gravity and rear-end air pressure for drainage. The negative pressure ejector suction structure does not require any mechanical pumping components to be added inside the main shaft, thus achieving efficient forced drainage of complex rotary heat exchanger networks in a closed state. It completely eliminates the blind spots of water accumulation on the pipe walls, improves internal heat exchange efficiency and equipment operation safety. 2. This invention solves the defects of conventional horizontal double ribbon mixers, which suffer from internal thermal dead zones and extremely low heating efficiency due to the solid and unheated central main shaft, by connecting multiple sets of heat exchange components composed of radial branch pipes and arc-shaped coils to the outside of the hollow main shaft, and by setting auger blades and spiral scrapers with opposite rotation directions on the outer wall of the main shaft and the outer side of the coils respectively. This solution not only allows the high-temperature heat source to directly penetrate into the interior of the extremely viscous material for three-dimensional and all-round heat release, but also completely breaks the phenomenon of material sticking to the shaft and slipping when the horizontal coil rotates in the extremely viscous material by the reverse spiral thrust inside and outside, forcibly constructing a two-way convection flow field with the center forward and the periphery backward, and realizing the perfect flipping of high viscosity fluid; 3. This invention solves the problem of traditional planetary mixing tanks and other equipment where condensate can only drip directly onto the material surface by gravity, resulting in excessive surface moisture, deep water shortage and scorching, and surface clumping. By assembling streamlined vanes on the radial branch pipes and laying capillary pipes connected to external condensate along the pipe wall, the present invention addresses the shortcomings of traditional equipment such as planetary mixing tanks where condensate can only drip directly onto the material surface by gravity, resulting in excessive surface moisture, deep water shortage and scorching, and surface clumping. When the streamlined vanes cut through high-viscosity materials along the main shaft, they generate a strong wake negative pressure zone on the back flow surface. The negative pressure forces the condensate in the capillary pipes to be extracted, achieving direct micro-injection and uniform mixing in the deep material below the liquid surface. Furthermore, the transverse wide-body expansion or spring adaptive structure of the vanes can maintain extremely low fluid running resistance while continuously forcibly pressing the buoyant pulp into the deep layer by utilizing the increased frontal shielding area, thus resolving the technical pain point of pulp stratification. Attached Figure Description

[0017] Figure 1 This is a front perspective view of the present invention; Figure 2 This is a left perspective view of the present invention; Figure 3 To highlight the main structural diagram of the present invention; Figure 4 To highlight the internal structure of the inner tank of this invention; Figure 5 A schematic diagram illustrating the structure of the spiral scraper of the present invention; Figure 6This is a schematic diagram from the front view of Embodiment 2 of the present invention; Figure 7 A schematic diagram from the left side of Embodiment 2 of the present invention is shown to highlight the present invention. Figure 8 To highlight the structural diagram of Embodiment 3 of the present invention; Figure 9 for Figure 8 Enlarged view of point A in the middle; Figure 10 A schematic diagram of the reflux channel of the present invention is provided to highlight the invention. Figure 11 A schematic diagram of the drainage channel of the present invention is provided to highlight the invention. Figure 12 This is a schematic diagram illustrating the connection state between the radial branch tube and the inner tube of the present invention; Figure 13 This is a schematic diagram illustrating the separation state of the main shaft and the inner tube in this invention; Figure 14 This is a flow chart of the steam flow of the present invention.

[0018] The components include: 1. Mounting platform; 2. Outer jacket; 3. Inner tank; 4. Motor; 5. Rotary joint one; 6. Rotary joint two; 7. Main shaft; 8. Screwdriver blades; 9. Radial branch pipe; 10. Arc-shaped coil; 11. Spiral scraper; 12. Jacket air inlet; 13. Jacket exhaust port; 14. Inner tube; 15. Secondary air inlet; 16. Reflux annular groove; 17. Air inlet annular groove; 18. Reflux port; 19. Main air inlet; 20. Central distribution valve block; 21. Hourglass-shaped cavity; 22. Reflux channel; 23. Air inlet channel; 24. Drainage channel; 25. Spare port; 26. Capillary tube; 27. Blade; 28. Drain hole; 29. ​​Feed pipe; 30. Condenser pipe; 31. Condenser reflux pipe. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see the appendix Figure 1 - Appendix Figure 3This invention provides a jam cooking device, including a mounting platform 1, an inner tank 3 mounted on the mounting platform 1, an outer jacket 2 sleeved outside the inner tank 3, a main shaft 7 transversely passing through the inside of the inner tank 3, and a motor 4 mounted on the mounting platform 1 for driving the main shaft 7 to rotate. A closed cavity is formed between the outer jacket 2 and the inner tank 3. The outer side wall of the outer jacket 2 is provided with a jacket air inlet 12 and a jacket exhaust 13, respectively. The top of the inner tank 3 is connected to a feed pipe 29. When the device is running, the heat medium provides basic heat preservation for the material in the inner tank 3 through the closed cavity of the outer jacket 2. Please see the appendix Figure 4 - Appendix Figure 5 Spiral auger blades 8 are fixedly arranged on the outer wall of the main shaft 7. Multiple radial branch pipes 9 connected to the arc-shaped coil 10 are distributed on the side wall of the main shaft 7. A spiral scraper 11 is fixedly connected on the outer wall of the arc-shaped coil 10 away from the main shaft 7. The spiral direction of the spiral scraper 11 is opposite to that of the spiral auger blades 8. When the motor 4 drives the main shaft 7 to rotate, the auger blades 8 close to the axis generate a positive thrust along the axial direction on the material, while the spiral scraper 11 located on the periphery generates a reverse thrust along the axial direction while peeling off the material attached to the inner wall of the inner tank 3. In this way, a two-way convection flow field with radial and axial interweaving is constructed in the inner tank 3. Please see the appendix Figure 12 - Appendix Figure 13 The main shaft 7 is coaxially fitted with an inner tube 14. An air inlet chamber is formed between the inner side wall of the main shaft 7 and the outer side wall of the inner tube 14. Multiple sets of heat exchange components are arranged along the circumferential and axial directions on the outer side wall of the main shaft 7. Each set of heat exchange components includes two radial branch pipes 9 and an arc-shaped coil 10. One end of the two radial branch pipes 9 is connected to the two ends of the same arc-shaped coil 10. The multiple sets of heat exchange components include a first heat exchange group and a second heat exchange group. The other ends of the two radial branch pipes 9 in the first heat exchange group are connected to the air inlet chamber in the main shaft 7. The second heat exchange group is arranged on the side close to the main shaft 7 and away from the central distribution valve block 20. The other end of one of the radial branch pipes 9 in the second heat exchange group is connected to the air inlet chamber, and the other end of the other radial branch pipe 9 passes through the main shaft 7 and is connected to the interior of the inner tube 14. Steam is dispersed from the air inlet chamber into each set of radial branch pipes 9 and arc-shaped coil 10 to release heat. The generated condensate is concentrated and guided to the interior of the inner tube 14 through the radial branch pipe 9 at the end. Please see the appendix Figure 10 - Appendix Figure 11One end of the main shaft 7 is connected to a central distribution valve block 20. A rotary joint 26, installed on the outside of the outer jacket 2, is fitted onto the outside of the central distribution valve block 20. An hourglass-shaped cavity 21 is formed inside the central distribution valve block 20. The hourglass-shaped cavity 21 has a first end and a second end, with the first end being the air inlet and the second end being the exhaust end. The hourglass-shaped cavity 21 has its narrowest throat. An air inlet annular groove 17 and a return annular groove 16 are formed on the inner wall of the rotary joint 26. An air inlet channel 23 and a drainage channel are also formed inside the central distribution valve block 20. The two ends of the intake channel 24 and intake channel 23 are respectively connected to the intake annular groove 17 and the intake chamber in the main shaft 7. One end of the drainage channel 24 is connected to the inner tube 14, and the other end is connected to the narrowest throat of the hourglass-shaped cavity 21. The drain end of the hourglass-shaped cavity 21 is connected to the interior of the return annular groove 16 through the return channel 22. This structural connection utilizes the fluid dynamics mechanism. When the power gas flows through the narrowest throat at high speed, a dynamic negative pressure is generated, which applies a physical suction effect to the drainage channel 24, thereby forcibly extracting the condensate trapped inside the inner tube 14. Please see the appendix Figure 14 The jam cooking device in this embodiment includes Embodiment 1, Embodiment 2 and Embodiment 3. The external thermal circulation system structure of the three embodiments is the same. The outer shell of the rotary joint 2 6 is respectively provided with a main air inlet 19, a secondary air inlet 15 and a return port 18. The main air inlet 19 is connected to the air inlet annular groove 17, the secondary air inlet 15 is connected to the air inlet end, and the return port 18 is connected to the return annular groove 16. The external thermal circulation system includes a steam boiler, a pressure reducing and stabilizing valve and a filter connected in sequence by pipelines. The exhaust end of the filter is connected to the main air inlet 19, the secondary air inlet 15 and the jacket air inlet 12 respectively. The return port 18 and the jacket exhaust port 13 are both connected to an external water tank. The external water tank is connected to the water inlet end of the steam boiler through a water pump. The above pipeline arrangement enables the heating gas to be independently diverted and establishes a closed return network of heat medium and condensate.

[0021] Example 1: This example is based on a basic structure. The top of the inner tank 3 has an exhaust port. The device includes a condenser pipe 30 and a condenser return pipe 31 connected to the exhaust port. The liquid inlet of the condenser return pipe 31 is connected to the condenser pipe 30, and the liquid outlet of the condenser return pipe 31 passes through the outer jacket 2 and is directly connected to the inside of the inner tank 3. The water evaporated during the heating process enters the condenser pipe 30, and the cooled liquid water drips directly back to the material surface inside the inner tank 3 by gravity through the condenser return pipe 31 to compensate for the water loss of the material.

[0022] Example 2: The overall content of this example is the same as that of Example 1, except for the condensate delivery and mixing structure; Please see the appendix Figure 6 - Appendix Figure 7A rotary joint 5 is installed at the end of the main shaft 7 away from the central distribution valve block 20. The output end of the motor 4 passes through the rotary joint 5 and is connected to the main shaft 7. A spare interface 25 is provided on the outside of the rotary joint 5. A fin 27 with a drain hole 28 is installed on the outer wall of one of the radial branch pipes 9 of the heat exchange components. A capillary tube 26 is attached to the outer wall of the main shaft 7. One end of the capillary tube 26 is connected to the internal flow channel of the rotary joint 5, and the other end of the capillary tube 26 is connected to the drain hole 28. The outlet end of the condensate return pipe 31 is connected to the spare interface 25, so that the condensate is introduced into the capillary tube 26 through the internal flow channel. The vane 27 has a backflow surface and a trailing edge. The drain hole 28 is located on the backflow surface or the trailing edge. The vane 27 is movably mounted on the radial branch pipe 9 by a torsion spring. In the early stage of the process, when the material viscosity is low, the spring force of the torsion spring is greater than the fluid resistance. The vane 27 maintains a large angle of inclination to the flow to increase the axial pressure on the floating material during rotation. As the process progresses, the material viscosity increases, the fluid resistance gradually increases, and the torsion spring deforms. The vane 27 folds backward to reduce the angle of inclination to the flow, thereby reducing the rotational resistance of the main shaft 7. When the vane 27 travels in the fluid, its backflow surface generates a negative pressure zone. Through the hydrodynamic suction, the water in the capillary tube 26 is drawn into the material through the drain hole 28, realizing the dispersion and mixing of water in the deep layer of the material.

[0023] Example 3: The overall content of this example is the same as that of Example 1, except that the condensate delivery and mixing structure is the same. Please see the appendix Figure 8 - Appendix Figure 9 The pipe connection structure in Embodiment 3 is the same as that in Embodiment 2. The difference in structure lies in the fixing form and external shape of the wing 27. In Embodiment 3, the wing 27 is rigidly fixed on the radial branch pipe 9. The cross section of the wing 27 is streamlined. The wing 27 has a lateral width expansion along the axis of the main shaft 7, which increases the solid area of ​​the structural surface. In actual operation, the laterally extended rigid vane 27 increases the frontal shielding area. When the main shaft 7 rotates, the expanded structural area exerts a continuous downward pressure on the material. Since the vane 27 adopts a fixed streamlined cross-sectional profile, even in the case of high material viscosity, the fluid dynamics resistance it generates is at a low level. When the vane 27 rotates with the main shaft 7 to cut the fluid, it smoothly transitions from the front end to the tail edge, and a negative pressure flow field is stably generated in the area of ​​the drain hole 28 on the back flow surface, thereby uniformly guiding the condensed water to the gaps in the lower material structure.

[0024] Working principle: During the start-up phase of the device, the jam material to be cooked is fed into the inner tank 3 through the feed pipe 29. The high-pressure steam generated by the external steam boiler is divided into different thermal branches after being processed by the pressure reducing and stabilizing valve and the filter. One of the steam branches is connected to the jacket air inlet 12, filling the closed jacket cavity between the outer jacket 2 and the inner tank 3, and performing large-area contact basic insulation and heating on the material inside the inner tank 3. The cooled gas or condensate after heat exchange in the outer jacket 2 is then discharged through the jacket exhaust port 13 and returned to the external water tank. During the heating and cooking process, the motor 4 fixed on the mounting platform 1 starts and drives the main shaft 7 to rotate at a constant speed inside the inner tank 3. When the main shaft 7 rotates, the auger blades 8 fixed on its outer wall continuously apply positive axial thrust to the high-viscosity material inside, pushing the material forward as a whole. At the same time, the spiral scraper 11 located on the outermost edge of the heat exchange frame continuously scrapes against the inner wall of the inner tank 3 to prevent local material from overheating and scorching. Since the spiral direction of the spiral scraper 11 is opposite to that of the auger blades 8, it generates reverse thrust on the surrounding material during the scraping process. The mechanical cooperation of the two establishes a two-way convection flow field inside the inner tank 3 with the center forward and the periphery backward, which greatly improves the overall heating uniformity of the material. While the main shaft 7 is rotating and mixing the material, another main heating steam is connected to the main air inlet 19 on the rotary joint 6. It flows through the air inlet annular groove 17 and the air inlet channel 23 in the central distribution valve block 20 in sequence, and fills the air inlet chamber between the main shaft 7 and the inner tube 14. The high temperature gas in the air inlet chamber is radially dispersed into multiple radial branch pipes 9 of the first heat exchange group and the second heat exchange group, and then enters the arc-shaped coil 10. The steam undergoes intense heat exchange with the external material in the arc-shaped coil 10. The condensed liquid water is guided by the internal pressure and the centripetal force of rotation, and is discharged into the relatively low-pressure inner tube 14 through the radial branch pipe 9 that penetrates the wall of the main shaft 7 in the second heat exchange group. To solve the problem of condensate buildup inside the rotating components, a small stream of power steam diverted from the filter is connected to the auxiliary air inlet 15 and directly introduced into the first end of the hourglass-shaped cavity 21 inside the central distribution valve block 20. When the power steam passes through the narrowest throat of the hourglass-shaped cavity 21 at high speed, the flow velocity surges due to the sudden change in the flow cross-sectional area, generating a strong dynamic negative pressure in this area. This physical negative pressure generates a continuous outward suction force on the connected drainage channel 24, forcibly drawing out the condensate accumulated inside the inner tube 14. After the condensate mixes with the power steam in the hourglass-shaped cavity 21, it enters the return channel 22 through the drain end at the second end, and then passes through the return annular groove 16 and the return interface 18, and is finally transported back to the external water tank, realizing real-time dynamic drainage of the inner cavity of the main shaft 7. As the cooking process proceeds, the water vapor generated by the material in the inner tank 3 evaporates through the top exhaust port and enters the condenser 30 to be cooled and reduced to liquid water, which then enters the condenser return pipe 31 for flow path distribution. In the basic operating mode, the liquid outlet of the condensate return pipe 31 directly penetrates the outer jacket 2, and the condensate inside drips naturally onto the material surface inside the inner tank 3 by its own gravity to carry out basic water replenishment operations. In the dynamic injection operation mode, the liquid outlet of the condenser reflux pipe 31 is connected to the spare interface 25 on the outside of the rotary joint 5. The condensate flows through the internal channel of the rotary joint 5 and is introduced into the capillary tube 26 attached to the outer wall of the main shaft 7. The main shaft 7 drives the vanes 27 on the radial branch pipe 9 to rotate and pass through the material. When the streamlined cross section of the vanes 27 cuts through the high viscosity material, a stable hydrodynamic wake negative pressure zone is formed on its back surface or tail edge. This negative pressure zone directly acts on the drain hole 28, forcibly extracting the condensate in the capillary tube 26 and realizing direct micro-injection and mixing in the deep area below the liquid surface of the material. In response to the viscosity changes of the material at different stages, the vane 27 is dynamically assembled by a torsion spring. In the early stage of the process, it presses the material downward at a large angle. In the later stage at high viscosity, it folds backward to reduce the frontal section and reduce the running resistance of the main shaft 7. In another operating mode, the rigidly fixed vane 27 expands laterally to both sides. By using the increased structural area, it continuously forces the floating material downward during rotation. At the same time, it maintains low running resistance by relying on its fixed streamlined cross-sectional shape and stably provides a negative pressure in the wake to ensure the deep drainage effect of the drain hole 28.

Claims

1. A jam cooking apparatus, comprising a mounting platform (1), an inner tank (3) disposed on the mounting platform (1), an outer jacket (2) sleeved outside the inner tank (3), a main shaft (7) transversely passing through the interior of the inner tank (3), and a motor (4) mounted on the mounting platform (1) for driving the main shaft (7) to rotate, characterized in that: The main shaft (7) is coaxially fitted with an inner tube (14). One end of the main shaft (7) is connected to a central distribution valve block (20). The central distribution valve block (20) has an hourglass-shaped cavity (21) inside. The hourglass-shaped cavity (21) has a narrowest throat. The narrowest throat is connected to one end of the inner tube (14) and is used to generate negative pressure when gas flows through the narrowest throat to draw the fluid in the inner tube (14).

2. The jam cooking apparatus according to claim 1, characterized in that, An air inlet cavity is formed between the inner wall of the main shaft (7) and the outer wall of the inner tube (14). Multiple sets of heat exchange components are arranged along the circumferential and axial directions on the outer wall of the main shaft (7). Each set of heat exchange components includes two radial branch pipes (9) and an arc-shaped coil (10). One end of the two radial branch pipes (9) is connected to both ends of the same arc-shaped coil (10). The multiple heat exchange components include a first heat exchange group and a second heat exchange group. The other ends of the two radial branch pipes (9) in the first heat exchange group are connected to the air inlet chamber. The second heat exchange group is arranged on the side close to the main shaft (7) and away from the central distribution valve block (20). The other end of one of the radial branch pipes (9) in the second heat exchange group is connected to the air inlet chamber, and the other end of the other radial branch pipe (9) passes through the main shaft (7) and is connected to the interior of the inner tube (14).

3. The jam cooking apparatus according to claim 2, characterized in that, The central distribution valve block (20) is fitted with a rotary joint two (6) installed on the outside of the outer jacket (2). The inner side wall of the rotary joint two (6) is provided with an air intake annular groove (17) and a return annular groove (16). The central distribution valve block (20) is also provided with an air intake channel (23) and a drainage channel (24). The two ends of the air intake channel (23) are respectively connected to the air intake annular groove (17) and the air intake chamber. The hourglass-shaped cavity (21) has a first end and a second end, the first end being the air inlet and the second end being the drain end. One end of the drain channel (24) is connected to the inner tube (14), and the other end is connected to the narrowest throat. The drain end is connected to the interior of the return annular groove (16) through the return channel (22).

4. The jam cooking apparatus according to claim 3, characterized in that, The outer shell of the rotary joint 2 (6) is provided with a main air intake port (19), a secondary air intake port (15) and a return port (18). The main air intake port (19) is connected to the air intake annular groove (17), the secondary air intake port (15) is connected to the air intake end, and the return port (18) is connected to the return annular groove (16).

5. The jam cooking apparatus according to claim 4, characterized in that, The outer jacket (2) and the inner tank (3) form a closed cavity. The outer side wall of the outer jacket (2) is provided with a jacket air inlet (12) and a jacket exhaust port (13). The top of the inner tank (3) is connected to a feed pipe (29).

6. The jam cooking apparatus according to claim 5, characterized in that, The device also includes an external thermal circulation system, which includes a steam boiler, a pressure reducing and stabilizing valve and a filter connected in sequence by pipelines. The exhaust end of the filter is connected to the main air inlet (19), the auxiliary air inlet (15) and the jacket air inlet (12) respectively. The return port (18) and the jacket exhaust port (13) are both connected to an external water tank. The external water tank is connected to the water inlet of the steam boiler through a water pump.

7. The jam cooking apparatus according to claim 1, characterized in that, Spiral auger blades (8) are fixedly arranged on the outer wall of the main shaft (7). Multiple radial branches (9) connected to the arc-shaped coil (10) are distributed on the side wall of the main shaft (7). A spiral scraper (11) is fixedly connected to the outer wall of the arc-shaped coil (10) away from the main shaft (7). The spiral direction of the spiral scraper (11) is opposite to that of the spiral auger blades (8).

8. The jam cooking apparatus according to claim 1, characterized in that, A rotary joint (5) is installed at the end of the main shaft (7) away from the central distribution valve block (20). The output end of the motor (4) passes through the rotary joint (5) and is connected to the main shaft (7). A fin (27) with a drain hole (28) is installed on the outer wall of one of the radial branch pipes (9) of each heat exchange assembly. A capillary tube (26) is attached to the outer wall of the main shaft (7). One end of the capillary tube (26) is connected to the internal flow channel of the rotary joint (5), and the other end of the capillary tube (26) is connected to the drain hole (28).

9. A jam cooking apparatus according to claim 8, characterized in that, The top of the inner tank (3) is provided with an exhaust port. The device also includes a condenser pipe (30) and a condenser return pipe (31) that connect the exhaust port. A spare interface (25) is provided on the outside of the rotary joint (5). The liquid inlet end of the condenser return pipe (31) is connected to the condenser pipe (30). The liquid outlet end of the condenser return pipe (31) passes through the outer jacket (2) and is connected to the inside of the inner tank (3). Alternatively, the liquid outlet end of the condenser return pipe (31) is connected to the spare interface (25) and is connected to the capillary tube (26) through the internal flow channel of the rotary joint (5).

10. A jam cooking apparatus according to claim 8, characterized in that, The cross-section of the blade (27) is streamlined or a streamlined flat plate is added at the back ridge. The blade (27) has a back flow surface and a trailing edge. The drain hole (28) is opened at the back flow surface or the trailing edge. The blade (27) is movably mounted on the radiation branch pipe (9) by a torsion spring; or the blade (27) is rigidly fixed on the radiation branch pipe (9).

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