Ultrasonic assisted multi-layer coil type pasteurization device

Abstract

The utility model relates to the field of sterilization device discloses a kind of ultrasonic collaborative multilayer coil type pasteurization device, comprising: pasteurization box, pasteurization box is provided with coil type sterilization mechanism and maintenance mechanism;The coil type sterilization mechanism includes outer ring coil, middle ring coil, inner ring coil, connecting pipe one, connecting pipe two, outer ring jacket, ultrasonic transducer and cold water pipe;Connecting pipe one is fixedly installed between outer ring coil and middle ring coil, connecting pipe two is fixedly installed between middle ring coil and inner ring coil, and outer ring jacket is fixedly sleeved on outer ring coil.The utility model has the following advantages and effects: reduce deterioration, swollen package problem caused by spore bacteria recovery reproduction in dairy storage stage, meet high-quality dairy production demand, reduce heat loss, improve sterilization energy efficiency, facilitate maintenance, and it is beneficial to long-term stable operation of equipment.

Description

Technical Field

[0001] This utility model relates to the field of sterilization device technology, and in particular to an ultrasonic-assisted multi-layer coil pasteurization device. Background Technology

[0002] In the production and processing of liquid foods such as dairy products, pasteurization is a crucial step in ensuring product quality and safety. Its core function is to effectively inactivate harmful microorganisms, inhibit spore growth, and minimize nutrient loss and equipment contamination. However, existing pasteurization technologies and related equipment face several pressing problems that need to be addressed. 1. Traditional plate heat exchanger pasteurization process has limited ability to inactivate heat-resistant spore-forming bacteria (such as thermophilic Bacillus stearothermophilus). In the sterilization process of high-protein dairy products (taking cow's milk as an example), the residual spore-forming bacteria will revive and multiply during the product storage stage, causing problems such as dairy product spoilage and bloating, seriously threatening product quality and consumer health, and failing to meet the production needs of high-quality dairy products. 2. If we try to introduce ultrasonic-assisted sterilization to enhance the sterilization effect, traditional equipment needs to be connected to an independent ultrasonic device and pipeline system. During the connection process, the newly added interface parts are prone to microbial contamination. In addition, the pipeline connection increases the heat transfer path, which leads to increased heat loss. This not only affects the sterilization efficiency, but also increases the difficulty of hygiene control in the production process, which is not conducive to continuous and efficient production. 3. Plate-type sterilizers are prone to coking due to their internal flow channel design, and they also have unsanitary corners where bacteria can easily remain and multiply. Furthermore, coking and these dead corners can cause localized overheating, damaging the nutritional components of dairy products and reducing product quality. Single-layer tubular sterilizers suffer from uneven liquid flow distribution, easily creating sterilization dead corners and failing to achieve comprehensive and uniform sterilization of materials. Additionally, the transmission efficiency of ultrasonic energy in a single-layer pipeline is low, making it difficult to leverage ultrasound to enhance sterilization effectiveness. 4. Sterilization devices are mostly molded as a single piece, making them inconvenient to disassemble and maintain.

[0003] Therefore, it is necessary to design an ultrasonic-assisted multi-layer coil pasteurization device to solve the above problems.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide an ultrasonic-assisted multi-layer coil pasteurization device to solve the above-mentioned problems.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an ultrasonic-assisted multi-layer coil pasteurization device, comprising: A pasteurization chamber, wherein the pasteurization chamber is equipped with a coil-type sterilization mechanism and a maintenance mechanism; The coil-type sterilization mechanism includes an outer coil, a middle coil, an inner coil, a connecting pipe one, a connecting pipe two, an outer jacket, an ultrasonic transducer, and a cold water pipe. The first connecting pipe is fixedly installed between the outer coil and the middle coil, the second connecting pipe is fixedly installed between the middle coil and the inner coil, the outer ring jacket is fixedly sleeved on the outer coil, the ultrasonic transducer is fixedly installed on the middle coil, the cold water pipe is fixedly installed on the pasteurization chamber, and thermally conductive silicone grease is filled between the cold water pipe and the inner coil.

[0007] A further feature of this invention is that the coil-type sterilization mechanism includes a rib plate, a hot water inlet pipe, and a hot water outlet pipe. The rib plate is fixedly installed on the outer coil. The rib plate is fixedly connected to the top inner wall and the bottom inner wall of the pasteurization chamber. The hot water inlet pipe and the hot water outlet pipe are both fixedly connected to the outer jacket.

[0008] A further feature of this invention is that temperature sensors are fixedly installed on the outer coil, the middle coil, and the inner coil.

[0009] By adopting the above technical solution, temperature monitoring becomes convenient.

[0010] A further feature of this invention is that the maintenance mechanism includes an outer plate, an insert plate, a limiting frame, a vertical plate, and fixing screws. The outer plate abuts against the side of the pasteurization chamber. The insert plate is fixedly installed on the side of the pasteurization chamber and is engaged with the outer plate. The inner side of the limiting frame abuts against the pasteurization chamber and the outer plate. The vertical plate is fixedly installed at the bottom of the limiting frame and is engaged with the insert plate. The fixing screws are threadedly installed on the insert plate and threadedly connected to the vertical plate.

[0011] A further feature of this invention is that a control panel is fixedly installed on the pasteurization chamber.

[0012] A further feature of this invention is that the bottom of the limiting frame is in contact with the insert plate.

[0013] By adopting the above technical solution, the limiting frame is subjected to limiting treatment.

[0014] A further feature of this invention is that the outer plate has a socket hole on its side, and the insert plate is engaged with the socket hole.

[0015] By adopting the above technical solution, it is convenient to connect the outer plate and the plug plate.

[0016] A further feature of this invention is that the top of the insert plate has a vertical hole, and the vertical plate is engaged with the vertical hole.

[0017] The beneficial effects of this utility model are: This invention significantly improves sterilization efficiency by using a coil-type sterilization mechanism that combines ultrasound and heat, reducing spoilage and bloating problems caused by the resurgence and reproduction of spores during dairy product storage, thus meeting the needs of high-quality dairy product production. The multi-layer coil integrated in the pasteurization chamber shortens the heat transfer path, and the hot water preheating design of the outer jacket reduces heat loss and improves sterilization efficiency, which is conducive to continuous and efficient production. This utility model, through its maintenance mechanism, facilitates the cleaning and repair of components such as coils and sensors. This detachable design simplifies the maintenance process and is conducive to the long-term stable operation of the equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an ultrasonic-assisted multi-layer coil pasteurization device proposed in this utility model.

[0020] Figure 2 This is a top-down sectional view of the internal structure of an ultrasonic-assisted multi-layer coil pasteurization device proposed in this utility model.

[0021] Figure 3 yes Figure 1 A schematic diagram of part A in the diagram.

[0022] In the diagram, 1. Pasteurization chamber; 2. Outer coil; 3. Middle coil; 4. Inner coil; 5. Connecting pipe one; 6. Connecting pipe two; 7. Rib plate; 8. Outer jacket; 9. Hot water inlet pipe; 10. Hot water outlet pipe; 11. Ultrasonic transducer; 12. Temperature sensor; 13. Cooling water pipe; 14. Thermal grease; 15. Outer plate; 16. Insert plate; 17. Limiting frame; 18. Vertical plate; 19. Fixing screw; 20. Control panel. Detailed Implementation

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through the specific circumstances.

[0024] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] See Figure 1 , Figure 2 and Figure 3 This utility model provides an ultrasonic-assisted multi-layer coil pasteurization device, comprising: Pasteurization chamber 1, which is equipped with a coil-type sterilization mechanism and a maintenance mechanism; The coil-type sterilization mechanism includes an outer coil 2, a middle coil 3, an inner coil 4, a connecting pipe 1 5, a connecting pipe 2 6, an outer jacket 8, an ultrasonic transducer 11, and a cold water pipe 13. Connecting pipe 5 is fixedly installed between the outer coil 2 and the middle coil 3. Connecting pipe 6 is fixedly installed between the middle coil 3 and the inner coil 4. The outer ring jacket 8 is fixedly sleeved on the outer coil 2. The ultrasonic transducer 11 is fixedly installed on the middle coil 3. It should be noted that the ultrasonic transducers 11 are arranged in groups of 6 every 120° along the spiral line of the middle coil 3. The spacing between the ultrasonic transducers 11 along the Z-axis direction perpendicular to the tube wall is 200mm. The outer shell of the ultrasonic transducer 11 is laser welded to the outer wall of the middle coil 3. Energy transfer: transducer piezoelectric ceramic sheet (PZT-8) → titanium alloy amplitude transformer (amplification ratio 1:1.5) → directly coupled to the tube wall. The cold water pipe 13 is fixedly installed on the pasteurization chamber 1, and thermally conductive silicone grease 14 is filled between the cold water pipe 13 and the inner coil 4.

[0026] Through the above structure, milk enters from the bottom of the outer coil 2, flows through the outer jacket 8 area, and hot water is injected from the hot water inlet pipe 9 at the bottom of the outer jacket 8 and discharged from the hot water outlet pipe 10 at the top. The milk is preheated to 60°C by the hot water and flows into the middle coil 3. The ultrasonic transducer 11 works, with 22kHz for main sterilization and 50kHz for anti-coking. Cavitation bubbles burst the structure of bacteria to achieve sterilization. The milk then comes to the cold water pipe 13 of the inner coil 4, where the cold water temperature is 4°C. It absorbs heat in a countercurrent manner, and finally, the milk cools down to 4°C at the top outlet of the inner coil 4.

[0027] Specifically, the coil-type sterilization mechanism also includes a rib plate 7, a hot water inlet pipe 9, and a hot water outlet pipe 10. The rib plate 7 is fixedly installed on the outer coil 2. The rib plate 7 is fixedly connected to the top inner wall and the bottom inner wall of the pasteurization chamber 1. The hot water inlet pipe 9 and the hot water outlet pipe 10 are both fixedly connected to the outer jacket 8.

[0028] With the above structure, hot water is injected from the hot water inlet pipe 9 at the bottom of the outer ring jacket 8 and discharged from the hot water outlet pipe 10 at the top. The coil-type sterilization mechanism is fixed inside the pasteurization chamber 1 by the rib plate 7.

[0029] Specifically, temperature sensors 12 are fixedly installed on the outer coil 2, the middle coil 3, and the inner coil 4. It should be noted that the temperature sensors 12 are platinum resistance thermometers (PT100). The PT100 is embedded in the coil wall, with a Φ3mm hole, and is encapsulated with epoxy resin. The outer coil 2 is located 200mm from the inlet, the middle coil 3 is located at the first / middle / last point of the ultrasonic segment, and the inner coil 4 is located 150mm from the outlet.

[0030] Specifically, the maintenance mechanism includes an outer plate 15, an insert plate 16, a limiting frame 17, a vertical plate 18, and a fixing screw 19. The outer plate 15 abuts against the side of the pasteurization chamber 1. The insert plate 16 is fixedly installed on the side of the pasteurization chamber 1 and is engaged with the outer plate 15. The inner side of the limiting frame 17 abuts against the pasteurization chamber 1 and the outer plate 15. The vertical plate 18 is fixedly installed at the bottom of the limiting frame 17 and is engaged with the insert plate 16. The fixing screw 19 is threaded onto the insert plate 16 and is threadedly connected to the vertical plate 18.

[0031] With the above structure, when maintenance is required later, the locking screw 19 is turned to release the locking of the opposing plate 18, the limiting frame 17 is pulled upward to remove the limiting frame 17, and then the outer plate 15 is pulled to remove the outer plate 15. At this time, it is convenient to carry out maintenance on the inside of the pasteurization box 1, and the operation is relatively convenient.

[0032] Specifically, a control panel 20 is fixedly installed on the pasteurization chamber 1.

[0033] Specifically, the bottom of the limiting frame 17 contacts the insert plate 16, the outer plate 15 has an insertion hole on its side, the insert plate 16 is engaged with the insertion hole, the top of the insert plate 16 has a vertical hole, and the vertical plate 18 is engaged with the vertical hole. It should be noted that this can limit the outer plate 15 and facilitate the disassembly and assembly of the outer plate 15.

[0034] Working principle: When sterilizing milk, the milk enters the device through the bottom inlet of the outer coil 2. At this time, hot water is injected through the hot water inlet pipe 9 at the bottom of the outer jacket 8. Since the outer jacket 8 is fixedly fitted on the outer coil 2, the hot water flows inside the jacket and preheats the milk entering the outer coil 2 through heat transfer. After the hot water completes the preheating heat exchange, it is discharged from the hot water outlet pipe 10 at the top of the outer jacket 8. During this period, the temperature sensor 12 on the outer coil 2 monitors the milk temperature in real time to ensure that the milk is preheated to about 60°C to prepare for the subsequent sterilization steps. The rib plate 7 fixes the outer coil 2 inside the pasteurization chamber 1 to ensure the stability of the coil during operation. Preheated milk flows into the central coil 3 through connecting tube 5. The central coil 3 is the core sterilization area, and the ultrasonic transducer 11 installed on it starts working. The ultrasonic transducer 11 uses a 22kHz main sterilization frequency and a 50kHz anti-coking frequency working together. The ultrasonic energy generated by it is transmitted to the milk through the tube wall. The cavitation effect of the ultrasonic waves generates a large number of tiny bubbles. The energy released when the bubbles burst can destroy the cell structure of bacteria, thereby achieving the sterilization effect. At the same time, the 50kHz frequency can reduce the coking of milk on the tube wall. The temperature sensor 12 on the central coil 3 monitors the temperature of the sterilization area in real time to ensure a stable sterilization environment. The sterilized milk enters the inner coil 4 through the connecting pipe 2 6. The inner coil 4 is mainly responsible for cooling the sterilized milk. Cold water at 4°C is introduced into the cold water pipe 13. The thermally conductive silicone grease 14 filling the space between the cold water and the inner coil 4 enhances the heat transfer efficiency, allowing the milk and cold water to exchange heat in a countercurrent manner. During the heat exchange process, the milk temperature gradually decreases. The temperature sensor 12 on the inner coil 4 monitors the temperature of the milk after cooling, and finally cools the milk to about 4°C at the top outlet of the inner coil 4, which is convenient for subsequent storage. When maintenance is required, the maintenance mechanism comes into play. First, unscrew the fixing screws 19 on the insert plate 16 to release the fixing of the upright plate 18. Since the upright plate 18 is fixed to the bottom of the limiting frame 17 and the upright plate 18 is engaged with the insert plate 16, the limiting frame 17 can be pulled upward to disengage it from the pasteurization chamber 1 and the outer plate 15. Then, pull the outer plate 15 outward to disengage the insert plate 16 from the insertion hole of the outer plate 15. The outer plate 15 can then be removed to expose the coil-type sterilization mechanism inside the pasteurization chamber 1, making it convenient for operators to inspect, clean, or repair components such as coils and sensors. After maintenance, install the outer plate 15 and the limiting frame 17 in reverse order and tighten the fixing screws 19 to restore the normal use of the device.

[0035] The above provides a detailed description of the ultrasonic-assisted multi-layer coil pasteurization device provided by this utility model. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An ultrasonic-assisted multi-layer coil pasteurization device, characterized in that, include: Pasteurization chamber (1), wherein the pasteurization chamber (1) is equipped with a coil-type sterilization mechanism and a maintenance mechanism; The coil-type sterilization mechanism includes an outer coil (2), a middle coil (3), an inner coil (4), a connecting pipe one (5), a connecting pipe two (6), an outer jacket (8), an ultrasonic transducer (11), and a cold water pipe (13). The first connecting pipe (5) is fixedly installed between the outer coil (2) and the middle coil (3), the second connecting pipe (6) is fixedly installed between the middle coil (3) and the inner coil (4), the outer ring jacket (8) is fixedly sleeved on the outer coil (2), the ultrasonic transducer (11) is fixedly installed on the middle coil (3), the cold water pipe (13) is fixedly installed on the pasteurization box (1), and thermally conductive silicone grease (14) is filled between the cold water pipe (13) and the inner coil (4).

2. The ultrasonic-assisted multi-layer coil pasteurization device according to claim 1, characterized in that, The coil-type sterilization mechanism also includes a rib plate (7), a hot water inlet pipe (9), and a hot water outlet pipe (10). The rib plate (7) is fixedly installed on the outer coil (2). The rib plate (7) is fixedly connected to the top inner wall and bottom inner wall of the pasteurization chamber (1). The hot water inlet pipe (9) and the hot water outlet pipe (10) are both fixedly connected to the outer jacket (8).

3. The ultrasonic-assisted multi-layer coil pasteurization device according to claim 1, characterized in that, Temperature sensors (12) are fixedly installed on the outer coil (2), middle coil (3) and inner coil (4).

4. The ultrasonic-assisted multi-layer coil pasteurization device according to claim 1, characterized in that, The maintenance mechanism includes an outer plate (15), an insert plate (16), a limiting frame (17), a vertical plate (18), and a fixing screw (19). The outer plate (15) abuts against the side of the pasteurization chamber (1). The insert plate (16) is fixedly installed on the side of the pasteurization chamber (1) and is engaged with the outer plate (15). The inner side of the limiting frame (17) abuts against the pasteurization chamber (1) and the outer plate (15). The vertical plate (18) is fixedly installed at the bottom of the limiting frame (17) and is engaged with the insert plate (16). The fixing screw (19) is threaded onto the insert plate (16) and is threadedly connected to the vertical plate (18).

5. The ultrasonic-assisted multi-layer coil pasteurization device according to claim 1, characterized in that, The pasteurization chamber (1) is fixedly equipped with a control panel (20).

6. The ultrasonic-assisted multi-layer coil pasteurization device according to claim 4, characterized in that, The bottom of the limiting frame (17) is in contact with the insert plate (16).

7. The ultrasonic-assisted multi-layer coil pasteurization device according to claim 4, characterized in that, The outer plate (15) has a socket on its side, and the insert plate (16) is engaged with the socket.

8. The ultrasonic-assisted multi-layer coil pasteurization device according to claim 4, characterized in that, The top of the insert plate (16) has a vertical hole, and the vertical plate (18) is engaged with the vertical hole.

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