A closed-loop homogenization defoaming all-in-one machine for forming a whole-bean bean flower

Abstract

The application discloses a full-bean bean flower forming front slurry closed loop type homogenization defoaming all-in-one machine, and belongs to the technical field of food processing equipment, which comprises a homogenizer and a closed tank, a centrifugal distribution mechanism is arranged in the tank, can cut and spread the slurry into a continuous downward flowing thin layer liquid film, a negative pressure mechanism and a reflux condensation unit are arranged at the top of the tank, the reflux condensation unit adopts an inner wall spiral condensation pipe matched with a gas-liquid filter screen, can condense and recover the slurry and volatile flavor substances brought out by the negative pressure and return to the tank, a reverse cone structure and a negative pressure buffer layer are arranged at the bottom of the tank, the final discharge port is in sealed communication with the feeding end of the homogenizer, forms a closed loop processing circuit with the homogenization mechanism, can efficiently remove the micro-bubbles wrapped by fibers, at the same time, the original natural flavor of the full-bean bean flower is retained, secondary bubble generation is avoided, the machine is stable and reliable in operation, and is widely applicable to the industrialized production of full-bean bean flowers and bean curds.

Description

Technical Field

[0001] This invention relates to the field of food processing equipment technology, and in particular to a closed-loop homogenizing and defoaming integrated machine for the slurry before whole bean curd forming. Background Technology

[0002] In industrial production, whole bean pudding slurry typically undergoes processes such as soaking, grinding, boiling, and homogenization. During this process, the shearing action of the high-speed rotating grinding equipment, the shearing action of the homogenizer, and the turbulence during pumping all draw a large amount of air into the slurry, forming microbubbles with diameters ranging from tens to hundreds of micrometers.

[0003] If air bubbles in the slurry are not effectively removed before coagulation, they will be trapped in the gradually forming protein gel network when a coagulant is added and the mixture is allowed to solidify. Due to the high viscosity of whole bean curd slurry, the bubbles have very weak buoyancy during the gelation process, and most of them are "frozen" inside the solidified curd. This will result in irregular voids in the spaces occupied by the air bubbles after the curd is formed, disrupting the continuity of the protein gel network. At the same time, the presence of air bubbles is equivalent to introducing a large number of stress concentration points into the gel network, reducing the compressive strength and elasticity of the product. It is prone to breakage during subsequent cutting, packaging, or cooking. Furthermore, the residual oxygen in the air bubbles may accelerate fat oxidation, producing a beany or rancid taste.

[0004] Currently, vacuum degassing is a commonly used physical defoaming technology in the food industry. Its basic principle is to place the liquid in a sealed negative pressure container, and use the pressure difference between the inside and outside of the bubbles to make the microbubbles expand rapidly, float and burst, thereby removing the entrained gas. Existing vacuum degassing methods do not require the addition of chemical defoamers, are friendly to heat-sensitive components, and are effective in processing low-viscosity liquids such as fruit juice and milk. However, when this method is directly applied to whole bean curd slurry, due to the special physical properties of the slurry, the slurry is in a static state in a conventional vacuum tank. The internal microbubbles need to rely on their own buoyancy to overcome high viscosity resistance and float to the surface. Because the fiber particles overlap to form a weak gel network, the bubbles are wrapped and fixed, and the migration path is long and the speed is slow. Even if a high vacuum degree is applied, a large number of microbubbles are still "trapped" in the deep layer of the slurry, and the degassing efficiency of a single pass is insufficient.

[0005] Furthermore, whole bean pudding slurry contains a variety of volatile substances that give bean products their unique flavor, such as aldehydes, ketones, alcohols, and sulfur-containing compounds. During the vacuum degassing process, these flavor substances are evaporated along with water vapor and extracted from the system, resulting in a significant decrease in the flavor of the finished pudding or tofu, and even the production of a "steamed or boiled" taste or an oxidized off-flavor. The problem of flavor substance loss is particularly prominent in whole bean pudding because fiber particles have an adsorption effect on flavor substances. Conventional degassing methods are difficult to selectively retain aroma, while vacuum extraction will indiscriminately remove these sensitive components. Summary of the Invention

[0006] The purpose of this invention is to address the issue that, for high-viscosity, fiber-rich whole soybean slurry, a single centrifugal pass through a cloth may not completely remove all microbubbles. Through cyclic processing, the slurry can pass through a thin liquid film region multiple times, with bubbles being removed gradually, resulting in a degassing rate far exceeding that of a single pass. Simultaneously, because the slurry flows continuously in the loop, it avoids the stratification or fiber sedimentation that may occur during batch processing, ensuring that the slurry entering the coagulation process has a uniform composition and stable bubble content. Furthermore, the entire circulation is carried out in a sealed negative pressure environment, preventing external oxygen from entering, effectively inhibiting the oxidation of unsaturated fatty acids in the slurry, and preserving the natural color and flavor of whole soybean tofu.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: According to one aspect of the present invention, a closed-loop homogenizing and defoaming integrated machine for pre-forming whole bean tofu pudding is provided, comprising a homogenizer, wherein the discharge end of the homogenizer is sealed to the inlet of a closed tank via a conveying pipeline; A centrifugal spreading mechanism is provided above the interior of the closed tank. The centrifugal spreading mechanism includes a drive unit fixed to the center of the top of the closed tank. The output end of the drive unit rotates vertically downward through the top wall of the closed tank and extends into the inner cavity of the tank. A rotating shaft is coaxially fixed to the output end of the drive unit. A horizontally arranged centrifugal disc is coaxially fixed to the lower end of the rotating shaft. The centrifugal disc can rotate synchronously with the rotating shaft, so that the slurry entering the tank is evenly spread under the action of centrifugal force to form a thin liquid film that flows continuously downward. The top of the closed tank is also provided with a negative pressure mechanism, which includes an exhaust port opened on the top of the closed tank and a vacuum pump connected to the exhaust port. The vacuum pump makes a stable negative pressure environment form inside the closed tank. Through the negative pressure environment, the microbubbles wrapped in the thin liquid film rapidly expand and burst under the action of pressure difference. A reflux condensation unit is connected in series between the exhaust port and the vacuum pump. The reflux condensation unit includes a reflux tank with an internal gas-liquid filter screen and a condensation structure wrapped around the inner wall of the reflux tank for condensing the gas-liquid medium carried out by the negative pressure. The bottom of the closed tank has an inverted conical structure and a main discharge port at the center of the bottom. A negative pressure buffer layer is sealed below the main discharge port. The negative pressure buffer layer has a final discharge port. The final discharge port is sealed and connected to the feed end of the homogenizer to form a slurry circulation processing loop.

[0008] Preferably, a concave material dropping area is provided at the center of the upper surface of the centrifugal turntable.

[0009] Preferably, the feed inlet of the closed tank is arranged in a ring on the outer periphery of the rotating shaft, and one side of the feed inlet is horizontally inserted through the side wall of the closed tank and sealed and connected to the discharge end of the homogenizer.

[0010] Preferably, the upper surface of the centrifugal turntable gradually slopes downward from the center to the edge, and the outer edge of the centrifugal turntable is integrally formed with a number of uniformly spaced fabric teeth along the circumference, so that the slurry flies out from the edge of the centrifugal turntable in a uniform radial pattern under the action of centrifugal force.

[0011] Preferably, a thin layer of fabric gap is formed between the outer edge of the centrifugal turntable and the inner wall of the closed tank to control the thickness of the slurry film.

[0012] Preferably, the condensation structure includes a condenser tube spirally wound around the outer wall of the reflux tank, the upper end of the condenser tube extending out of the top of the reflux tank to form a cooling water inlet, and the lower end extending out of the bottom of the reflux tank to form a cooling water outlet.

[0013] Preferably, the gas-liquid filter screen is horizontally disposed inside the reflux tank and located between the air inlet and the liquid outlet of the reflux tank.

[0014] Preferably, the negative pressure buffer layer is a closed cavity structure and the final discharge port is sealed to the feed end of the homogenizer via a flange.

[0015] Preferably, the tank wall of the closed tank is provided with a heat-insulating layer, and the interior of the heat-insulating layer is filled with high-temperature resistant heat-insulating material.

[0016] Preferably, the drive unit includes a drive motor, which is fixed to the top of the enclosed tank by a bolt group.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention addresses the pain points of high viscosity in whole bean pudding slurry, easy fiber aggregation forming a weak gel network, and the resulting issues of bubble encapsulation and fixation, long upward floating paths, low degassing efficiency, and the easy generation of secondary bubbles during discharge in conventional vacuum degassing. It achieves efficient deep degassing through a synergistic structure of a centrifugal feeding mechanism and a negative pressure mechanism. A centrifugal turntable with an inclined upper surface, circumferential feeding teeth, and thin-layer feeding gaps can cut and spread the slurry into an extremely thin continuous liquid film, significantly shortening the upward floating path of bubbles. This allows the microbubbles encapsulated by fibers to rapidly expand and burst under negative pressure differential. Combined with a closed-loop circulation circuit formed by a homogenizer and the tank, the slurry can undergo multiple degassing processes, gradually removing all residual bubbles. Simultaneously, the inverted conical structure at the bottom avoids material accumulation in dead corners within the tank, and the negative pressure buffer layer discharge structure eliminates secondary bubbles generated during discharge due to pressure changes, resulting in a finished pudding free of honeycomb defects.

[0018] 2. This invention addresses the pain points of volatile flavor substances being lost in large quantities with water vapor during vacuum degassing, material waste caused by the removal of slurry droplets, and slurry oxidation and deterioration due to the introduction of external oxygen. It achieves flavor preservation and closed-loop material utilization through a built-in reflux condensation unit and a fully enclosed structure. The spirally wound condenser tubes on the inner wall can directly contact the mixed gas, rapidly condensing water vapor and volatile flavor substances such as aldehydes and alcohols that evaporate with it. Combined with a gas-liquid filter, it efficiently intercepts slurry droplets in the airflow. The condensed and recovered materials and flavor substances are returned to the tank for recycling through a reflux pipeline. This avoids material waste and solves the problem of diluted flavor in the finished product. Furthermore, the fully enclosed negative pressure treatment environment isolates external oxygen, effectively inhibiting the oxidation of unsaturated fatty acids and preventing the formation of beany and rancid flavors. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the structure of the closed tank in this invention; Figure 3 This is a schematic diagram of the centrifugal fabric distribution mechanism in this invention; Figure 4 This is a schematic diagram of the drive unit in the present invention; Figure 5 This is a schematic diagram of the centrifugal disc in this invention; Figure 6 This is a schematic diagram of the negative pressure mechanism in this invention; Figure 7 This is a schematic diagram of the reflux condensation unit structure in this invention; Figure 8 This is a schematic diagram of the discharge structure of the closed tank in this invention.

[0020] In the attached diagram: 1. Enclosed tank; 11. Feed inlet; 12. Main discharge outlet; 13. Negative pressure buffer layer; 14. Inverted conical structure; 15. Final discharge outlet; 16. Insulation jacket; 2. Centrifugal feeding mechanism; 21. Drive unit; 211. Drive motor; 212. Bolt assembly; 22. Rotating shaft; 23. Centrifugal turntable; 231. Feeding teeth; 232. Thin-layer feeding gap; 233. Dropping area; 3. Negative pressure mechanism; 31. Exhaust port; 32. Vacuum pump; 4. Reflux condensation unit; 41. Reflux tank; 42. Gas-liquid filter screen; 43. Condensation structure; 431. Condensation tube; 432. Cooling water inlet; 433. Cooling water outlet; 5. Homogenizer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the invention, and these aspects of the invention can be achieved even without these specific details.

[0022] Please see Figures 1 to 8 This invention provides a closed-loop homogenizing and defoaming machine for the slurry before whole bean tofu molding, the technical solution of which is as follows: like Figures 1 to 2 As shown, the discharge end of the homogenizer 5 is sealed to the inlet 11 of the closed tank 1 through a conveying pipeline. The closed tank 1 is the core container for degassing treatment. It has a sealed structure as a whole. The top is equipped with an openable sealing cover. The bottom of the closed tank 1 is equipped with an inverted conical structure 14. This conical structure is conducive to the natural convergence of the treated slurry by gravity, reducing the residue in the tank. The bottom center is provided with a main discharge port 12. A negative pressure buffer layer 13 is sealed below the main discharge port 12. The whole soybean slurry can be pumped by the homogenizer 5 into the closed tank 1 for degassing. The degassed slurry flows out from the bottom main outlet 12 and re-enters the feed end of the homogenizer 5, ready for the next cycle or finally output to the coagulation and molding section. This circulation path design allows the slurry to be degassed multiple times or continuously until the ideal degassing effect is achieved.

[0023] like Figure 3 As shown, a centrifugal feeding mechanism 2 is provided above the interior of the closed tank 1. The centrifugal feeding mechanism 2 includes a drive part 21 fixed to the center of the top of the closed tank 1. The drive part 21 includes a drive motor 211. The drive motor 211 is fixed to the top of the closed tank 1 by a bolt group 212. The output end of the drive motor 211 rotates vertically downward through the top wall of the closed tank 1 and extends into the inner cavity of the tank. The output end of the drive motor 211 is coaxially fixedly connected to a rotating shaft 22. The lower end of the rotating shaft 22 is coaxially fixedly connected to a horizontally arranged centrifugal turntable 23. In order to optimize the initial distribution of slurry on centrifugal turntable 23, the feed inlet 11 of the closed tank 1 is arranged in a ring on the outer periphery of the rotating shaft 22, and one side of the feed inlet 11 is horizontally inserted through the side wall of the closed tank 1 and sealed and connected to the discharge end of the homogenizer 5, so that the slurry fed from the homogenizer 5 can fall smoothly into the central area of ​​the upper surface of the centrifugal turntable 23.

[0024] like Figure 4As shown, the upper surface of the centrifugal turntable 23 is not a completely flat surface, but gradually slopes downward from the center to the edge. A concave material drop area 233 is provided at the center of the upper surface of the centrifugal turntable 23. The material drop area 233 is shallow and can temporarily receive and stabilize the flowing slurry, preventing the slurry from shifting to one side instantly under the action of centrifugal force. When the drive unit 21 drives the rotating shaft 22 and the centrifugal turntable 23 to rotate at high speed, the slurry falling into the material drop area 233 is rapidly spread outward along the inclined upper surface under the action of centrifugal force.

[0025] like Figure 5 As shown, the outer edge of the centrifugal turntable 23 is integrally formed with several uniformly spaced feeding teeth 231 along the circumference. When the slurry is thrown to the edge of the turntable, the feeding teeth 231 cut and disperse the continuous slurry flow into a large number of fine liquid lines or droplets, and fly out at high speed from the edge of the centrifugal turntable 23 in a near-radial trajectory. These liquid lines or droplets then collide with the inner wall of the closed tank 1. Due to surface tension and wall wetting, they quickly merge to form a very thin, continuously flowing downward liquid film. A thin-layer material gap 232 is formed between the outer edge of the centrifugal turntable 23 and the inner wall of the closed tank 1 to control the thickness of the slurry film. This ensures that the slurry film remains thin as it flows steadily down the inner wall of the tank under gravity. The formation of the thin-layer film greatly increases the surface area per unit volume of the slurry, creating conditions for subsequent negative pressure degassing.

[0026] like Figure 6 As shown, a negative pressure mechanism 3 is provided on the top of the closed tank 1. The negative pressure mechanism 3 includes an exhaust port 31 opened on the top of the closed tank 1 and a vacuum pump 32 connected to the exhaust port 31. The vacuum pump 32 continuously extracts gas from the inside of the closed tank 1 to maintain a stable negative pressure environment in the inner cavity of the tank. A large number of micro bubbles are distributed inside the thin liquid film flowing down the inner wall of the tank. These bubbles mainly come from the pressure difference formed on both sides of the previous process such as homogenization and stirring. The pressure inside the bubble is relatively higher than the external environmental pressure, which causes the bubble to expand rapidly and increase in volume. During the expansion process, the upward buoyancy of the bubble is significantly enhanced. At the same time, the extremely thin liquid film makes the upward path of the bubble extremely short. Therefore, the bubbles can quickly rise to the surface of the liquid film and burst, releasing the gas trapped inside. The released gas is then drawn out of the tank by the vacuum pump 32 above the exhaust port 31. This process achieves efficient and gentle degassing of the slurry, avoiding protein denaturation or flavor loss that may be caused by traditional heating or mechanical stirring degassing. During the negative pressure degassing process, the airflow will carry out some tiny droplets, namely slurry mist droplets, as well as water vapor evaporated from the slurry surface. If these are directly discharged into the vacuum pump 32, it will not only cause material loss, but may also damage the vacuum pump 32 and cause odor emissions. To this end, a reflux condensation unit 4 is connected in series between the exhaust port 31 and the vacuum pump 32. The reflux condensation unit 4 includes a reflux tank 41 with an internal gas-liquid filter screen 42, and a condensation structure 43 wrapped around the inner wall of the reflux tank 41 for condensing the gas-liquid medium carried out by the negative pressure. The gas-liquid filter screen 42 is horizontally arranged inside the reflux tank 41. When the mixed gas carrying droplets and water vapor enters the reflux tank 41 from the exhaust port 31, it first passes upward through the gas-liquid filter screen 42. The gas-liquid filter screen 42, with its huge specific surface area and inertial collision effect, efficiently intercepts and captures suspended slurry droplets in the gas. The intercepted droplets agglomerate into larger droplets and fall to the bottom of the reflux tank 41 under the action of gravity. The condensing structure 43 includes a condensing tube 431 spirally wound around the inner wall of the return tank 41. The upper end of the condensing tube 431 extends out of the top of the return tank 41 to form a cooling water inlet 432, and the lower end extends out of the bottom of the return tank 41 to form a cooling water outlet 433. When water vapor in the gas comes into contact with the condensing structure 43 wound around the inner wall of the return tank 41, the condensing structure 43 performs gas-liquid separation and condensation on the gas-liquid medium carried out by the negative pressure, and transports the condensed and recovered slurry back to the closed tank 1 through the return pipeline.

[0027] like Figure 8 As shown, the negative pressure buffer layer 13 is a closed cavity structure with a final discharge port 15 at the bottom center. The final discharge port 15 is sealed to the feed end of the homogenizer 5 through a flange. The slurry from the inverted conical bottom first enters the negative pressure buffer layer 13. This cavity plays the role of liquid sealing and pressure buffering, so that the pressure at the final discharge port 15 is close to atmospheric pressure, ensuring that the slurry can enter the feed end of the homogenizer 5 smoothly and continuously, avoiding uneven feeding caused by negative pressure fluctuations in the tank. The sealed tank 1 has an insulation jacket 16 on its wall, and the insulation jacket 16 is filled with high-temperature resistant insulation material to reduce heat loss during the processing.

[0028] Combination Figures 1 to 8 The following is a detailed description of a closed-loop homogenizing and defoaming machine for the slurry before bean curd forming, as described in this embodiment: The homogenizer 5 pumps the hot whole bean slurry, which has been processed by grinding, boiling and other previous processes, into the inlet 11 of the closed tank 1 through a sealed conveying pipeline. Since the inlet 11 is arranged in a ring on the outer periphery of the rotating shaft 22 and is located above the centrifugal disc 23, the slurry can fall into the concave dropping area 233 on the upper surface of the centrifugal disc 23 in a stable and low splash manner. The drive unit 21, such as a variable frequency speed control motor, drives the rotating shaft 22 and the centrifugal disc 23 to rotate at high speed. Under the action of centrifugal force, the slurry falling into the dropping area 233 quickly spreads outward along the inclined upper surface of the centrifugal disc 23. The upper surface of the centrifugal disc 23 gradually slopes downward from the center to the edge. This structural design allows the slurry to obtain a downward velocity component during the radial flow process, which is conducive to the smooth flow of the slurry to the edge of the disc and avoids liquid accumulation or rollback. When the slurry is pushed to the outer edge of the centrifugal turntable 23, the uniformly distributed circumferential teeth 231 cut and disperse the continuously flowing slurry into several fine liquid streams or radial liquid lines. These liquid lines are thrown out from the edge of the turntable at a high linear velocity and impact the inner wall of the closed tank 1. Since the inner wall of the tank has appropriate wettability, usually a stainless steel mirror surface or a food-grade polished surface, the liquid lines spread out and merge rapidly at the moment of impact, forming an extremely thin, continuous and uniform liquid film. More importantly, a thin material gap 232 is provided between the outer edge of the centrifugal turntable 23 and the inner wall of the closed tank 1. The existence of this gap forcibly limits the initial thickness of the liquid film: when the centrifugal turntable 23 rotates, only liquid layers smaller than the thickness of this gap can pass through smoothly and adhere to the tank wall. Excess slurry is blocked or thrown back by the edge of the turntable, thereby ensuring that the thickness of the liquid film is always controlled within the ideal range. This thin liquid film flows continuously downward along the inner wall of the tank under the action of gravity, forming a waterfall-like liquid curtain with uniform thickness from top to bottom. While the thin liquid film is being formed, the negative pressure mechanism 3 continues to work. The vacuum pump 32 evacuates air from the inside of the closed tank 1 through the exhaust port 31, so that the inner cavity of the tank maintains a stable negative pressure environment. At this time, the thin liquid film flowing down the inner wall of the tank originally contains a large number of micro bubbles. These bubbles mainly come from the previous mechanical processing such as homogenization, stirring, and pumping. Since the whole soybean milk contains surface active substances such as protein, oil, and polysaccharides, the bubble interface is relatively stable and it is difficult for them to float and break naturally. Under negative pressure, a significant pressure difference is formed inside and outside the bubble: the pressure inside the bubble is approximately the same as or slightly higher than the normal pressure, but higher than the gas pressure inside the external tank. According to the ideal gas law, under the condition of basically constant temperature, the bubble volume will expand rapidly as the external pressure decreases. After the bubble expands, the buoyancy it experiences increases significantly. The buoyancy is proportional to the bubble volume. At the same time, the bubble wall becomes thinner and the stability decreases. Because the thickness of the thin liquid film is extremely small, the path for the bubble to reach the liquid film surface, i.e. the gas-liquid interface, from any position inside the liquid film is extremely short. Under the combined effect of increased buoyancy and shortened path after expansion, the bubble rises to the liquid film surface and ruptures in a very short time, releasing the gas inside. The released gas is then drawn out of the tank by the vacuum pump 32 above the exhaust port 31. The advantages of this process are: the entire degassing process occurs at room temperature or process temperature, without the need for additional heating or the addition of chemical defoamers, thus avoiding damage to the functional properties of whole soybean protein and preserving the original flavor and nutrition of soy milk; in addition, due to the continuous renewal of the liquid film with fresh slurry constantly replenished above and the degassed slurry flowing away below, continuous and efficient degassing of large amounts of slurry is achieved. During the negative pressure pumping process, the high-speed flowing gas will carry out tiny slurry droplets from the surface of the liquid film. At the same time, the moisture on the surface of the liquid film will also evaporate and enter the gas phase. These gas-liquid mixtures first enter the return tank 41 from the exhaust port 31. A gas-liquid filter screen 42 is horizontally installed inside the return tank 41. When the mixed gas passes through the gas-liquid filter screen 42 from bottom to top, the slurry droplets in the gas will be captured due to inertial collision or direct interception. The captured tiny droplets will aggregate and grow on the fiber surface. When the gravity exceeds the surface adhesion, the droplets will fall to the bottom of the return tank 41. Meanwhile, cooling water is introduced into the condensing structure 43. When the cooling water flows through the condensing tube 431, it cools the internal space of the return tank 41 through the tube wall. When the water vapor in the gas comes into contact with the cooler inner wall of the tank and the gas-liquid filter screen 42, it condenses to form liquid water and also flows into the bottom of the return tank 41. The condensing tube 431 is spirally wound, which increases the heat exchange area within a limited height and improves the condensing efficiency. The liquid collected at the bottom of the return tank 41 is returned to the closed tank 1 through the return pipeline. After gas-liquid separation and condensation purification, the gas becomes a relatively dry and clean air or water vapor mixture, which is then discharged by the vacuum pump 32. After degassing, the slurry converges along the inverted conical structure 14 to the main discharge port 12 under the action of gravity. A negative pressure buffer layer 13 is also provided below the main discharge port 12. The negative pressure buffer layer 13 is a closed cavity with a certain volume. The liquid level inside it can naturally form a liquid seal, effectively isolating the negative pressure in the closed tank 1 from the normal or positive pressure environment of the downstream equipment. After passing through the negative pressure buffer layer 13, the slurry flows out from the final discharge port 15 at a state close to normal pressure.

[0029] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A closed-loop homogenizing and defoaming integrated machine for the slurry before whole bean tofu pudding molding, characterized in that, include: The homogenizer (5) has a sealed inlet (11) of a closed tank (1) connected to its discharge end via a conveying pipeline. A centrifugal feeding mechanism (2) is provided above the interior of the closed tank (1). The centrifugal feeding mechanism (2) includes a drive part (21) fixed at the center of the top of the closed tank (1). The output end of the drive part (21) rotates vertically downward through the top wall of the closed tank (1) and extends into the inner cavity of the tank. The output end of the drive part (21) is coaxially fixedly connected to a rotating shaft (22). The lower end of the rotating shaft (22) is coaxially fixedly connected to a horizontally arranged centrifugal turntable (23). The centrifugal turntable (23) can rotate synchronously with the rotating shaft (22) to spread the slurry entering the tank evenly under the action of centrifugal force, forming a thin liquid film that flows continuously downward. The top of the closed tank (1) is also provided with a negative pressure mechanism (3). The negative pressure mechanism (3) includes an exhaust port (31) opened on the top of the closed tank (1) and a vacuum pump (32) connected to the exhaust port (31). The vacuum pump (32) makes a stable negative pressure environment form inside the closed tank (1). Through the negative pressure environment, the microbubbles wrapped in the thin liquid film expand and burst rapidly under the action of pressure difference. A reflux condensation unit (4) is connected in series between the exhaust port (31) and the vacuum pump (32). The reflux condensation unit (4) includes a reflux tank (41) with an internal gas-liquid filter screen (42) and a condensation structure (43) wrapped around the inner wall of the reflux tank (41) for condensing the gas-liquid medium carried out by the negative pressure. The bottom of the closed tank (1) is provided with an inverted conical structure (14) and a main discharge port (12) is opened at the center of the bottom. A negative pressure buffer layer (13) is sealed below the main discharge port (12). The negative pressure buffer layer (13) is provided with a final discharge port (15). The final discharge port (15) is sealed and connected to the feed end of the homogenizer (5) to form a slurry circulation processing loop.

2. The closed-loop homogenizing and defoaming integrated machine for whole bean tofu pudding before molding, as described in claim 1, is characterized in that... A concave material dropping area (233) is provided at the center of the upper surface of the centrifugal turntable (23).

3. The closed-loop homogenizing and defoaming integrated machine for whole bean curd slurry before molding, as described in claim 1, is characterized in that... The feed inlet (11) of the closed tank (1) is arranged in a ring on the outer periphery of the rotating shaft (22), and one side of the feed inlet (11) is horizontally inserted through the side wall of the closed tank (1) and sealed and connected to the discharge end of the homogenizer (5).

4. The closed-loop homogenizing and defoaming integrated machine for whole bean curd slurry before molding, as described in claim 1, is characterized in that... The upper surface of the centrifugal turntable (23) gradually slopes downward from the center to the edge, and the outer edge of the centrifugal turntable (23) is integrally formed with several fabric teeth (231) evenly spaced along the circumference, so that the slurry flies out from the edge of the centrifugal turntable (23) in a uniform radial pattern under the action of centrifugal force.

5. The closed-loop homogenizing and defoaming integrated machine for whole bean curd slurry before molding, as described in claim 4, is characterized in that... A thin layer of fabric gap (232) is formed between the outer edge of the centrifugal turntable (23) and the inner wall of the closed tank (1) to control the thickness of the slurry film.

6. The closed-loop homogenizing and defoaming integrated machine for whole bean tofu pudding before molding, as described in claim 1, is characterized in that... The condensation structure (43) includes a condenser tube (431) spirally wound around the outer wall of the return tank (41). The upper end of the condenser tube (431) extends out of the top of the return tank (41) to form a cooling water inlet (432), and the lower end extends out of the bottom of the return tank (41) to form a cooling water outlet (433).

7. The closed-loop homogenizing and defoaming integrated machine for whole bean curd slurry before molding, as described in claim 1, is characterized in that... The gas-liquid filter screen (42) is horizontally arranged inside the return tank (41) and located between the air inlet and the liquid outlet of the return tank (41).

8. The closed-loop homogenizing and defoaming integrated machine for whole bean curd slurry before molding, as described in claim 1, is characterized in that... The negative pressure buffer layer (13) is a closed cavity structure and the final discharge port (15) is sealed to the feed end of the homogenizer (5) through a flange.

9. The closed-loop homogenizing and defoaming integrated machine for whole bean tofu pudding before molding, as described in claim 1, is characterized in that... The closed tank (1) has a heat-insulating interlayer (16) on its wall, and the heat-insulating interlayer (16) is filled with high-temperature resistant heat-insulating material.

10. The closed-loop homogenizing and defoaming integrated machine for whole bean curd slurry before molding, as described in claim 1, is characterized in that... The drive unit (21) includes a drive motor (211), which is fixed to the top of the closed tank (1) by a bolt group (212).

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