Vacuum buffer anti-backflow conveying chamber for paste condiment

Abstract

The utility model provides a kind of paste condiment vacuum buffer anti-reflux conveying cavity, belong to condiment conveying cavity technical field, this paste condiment vacuum buffer anti-reflux conveying cavity, including conveying cavity, vacuum buffer chamber, anti-reflux valve plate and feed interface;Conveying cavity is in cylindrical structure, the inner wall of conveying cavity is equipped with helical flow guide groove, helical flow guide groove is presented clockwise direction helical extension from the feed end of conveying cavity to discharge end;Vacuum buffer chamber is set in the top of conveying cavity, and vacuum buffer chamber is communicated with conveying cavity by connecting passage;Anti-reflux valve plate is located in connecting channel, and anti-reflux valve plate is hinged with the inner wall of connecting channel by hinged shaft, and the axis of hinged shaft is perpendicular to the axis of connecting channel, and anti-reflux valve plate is closed connecting channel when naturally drooping under the action of gravity;Feed interface is set in the feed end of conveying cavity, and the inner diameter of feed interface is less than the inner diameter of conveying cavity.

Description

Technical Field

[0001] This utility model belongs to the field of condiment conveying cavity technology, specifically, it relates to a vacuum buffer anti-backflow conveying cavity for paste condiments. Background Technology

[0002] Paste-like condiments such as tomato sauce, peanut butter, and sesame paste are widely used in the food industry. These products have high viscosity and thixotropy, requiring a pipeline system to transport materials from mixing tanks to filling machines or packaging equipment during production. Currently, the commonly used conveying method mainly employs screw pumps or plunger pumps in conjunction with straight-through pipelines. While this system can meet basic material conveying needs, it has significant technical drawbacks. Screw pumps and plunger pumps generate periodic pressure pulsations during operation. These pulsations are transmitted throughout the conveying system via the pipeline, leading to unstable flow rates. In the filling stage, this manifests as fluctuations in filling volume, affecting product consistency and yield. Simultaneously, elbows, valves, and other components in the pipeline create localized resistance, causing sudden pressure changes as material flows through these areas, further exacerbating pressure fluctuations. More seriously, when the conveying stops or the system pressure suddenly drops, material backflow can easily occur due to the inertia and residual pressure of the material in the pipeline. The backflowing material can flow back into the conveying pipeline and even the pump body, causing not only material loss but also residue and contamination on the inner wall of the pipeline, increasing the difficulty of cleaning and the risk of cross-contamination. Some production lines have tried to install check valves in the pipeline to prevent backflow, but traditional spring-loaded or gravity-operated check valves are prone to leaks due to the sealing surface being easily contaminated by viscous materials, and these valves have a slow response time, failing to prevent backflow in time. Utility Model Content

[0003] In view of this, the present invention provides a vacuum buffer anti-backflow conveying chamber for paste-like seasonings, which can solve the problem that pressure fluctuations caused by pump pulsation or changes in pipeline resistance during the conveying process of existing paste-like seasoning conveying devices not only affect the stability of the conveying flow rate, leading to inaccurate filling, but also easily cause material backflow when the conveying stops or the pressure suddenly drops. The backflowed material will contaminate the conveying pipeline and pump body, resulting in a decline in product quality and difficulty in cleaning the equipment. At the same time, pressure fluctuations will also damage the texture and stability of the paste-like seasonings, affecting the final quality of the product.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a vacuum buffer anti-backflow conveying cavity for paste-like seasonings, including a conveying cavity, a vacuum buffer chamber, an anti-backflow valve plate, and a feeding port. The conveying cavity has a cylindrical structure, and its inner wall is provided with a spiral guide groove that extends clockwise from the feeding end to the discharging end of the conveying cavity. The vacuum buffer chamber is located above the conveying cavity and is connected to the conveying cavity through a connecting channel. The axis of the connecting channel forms an angle of 85° to 95° with the axis of the conveying cavity. The anti-backflow valve plate is located inside the connecting channel and is hinged to the inner wall of the connecting channel through a hinge shaft. The axis of the hinge shaft is perpendicular to the axis of the connecting channel. When the anti-backflow valve plate naturally droops under gravity, it closes the connecting channel. The feeding port is located at the feeding end of the conveying cavity, and the inner diameter of the feeding port is smaller than the inner diameter of the conveying cavity.

[0006] The technical effects of the vacuum buffer anti-backflow conveying chamber for paste-like seasonings provided by this utility model are as follows: By setting the vacuum buffer chamber above the conveying cavity and connecting it through a connecting channel, the pressure fluctuations generated during the conveying process can be absorbed and alleviated by the vacuum buffer chamber, preventing sudden pressure changes from impacting the paste-like seasonings; the spiral guide groove enables the paste-like seasonings to form a spiral flow state in the conveying cavity, increasing the contact area between the material and the inner wall of the cavity and improving the conveying stability; the anti-backflow valve plate is installed in the connecting channel by a hinge, and naturally closes the connecting channel under the action of gravity. When the pressure in the conveying cavity is higher than the pressure in the vacuum buffer chamber, the valve plate opens to release the pressure. When the pressure is balanced or reversed, the valve plate automatically closes to prevent material backflow, thus realizing a passive anti-backflow function.

[0007] Based on the above technical solution, the vacuum buffer anti-backflow conveying cavity for paste-like condiments of this utility model can be further improved as follows:

[0008] The depth of the spiral guide groove gradually decreases from the feed end to the discharge end along the axial direction of the conveying cavity, and the groove depth at the feed end is 2 to 3 times the groove depth at the discharge end.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The design of the spiral guide channel with the depth gradually decreasing from the feeding end to the discharging end allows the paste-like seasoning to obtain a large spiral driving force at the feeding end. As the material moves towards the discharging end, the channel depth gradually becomes shallower, reducing the material flow resistance. This change adapts to the characteristic of the material pressure gradually decreasing during the conveying process, avoiding material stagnation at the discharging end due to excessive channel depth. At the same time, the deeper channel at the feeding end can accommodate more material and provide sufficient initial driving force, ensuring that the material can smoothly start the conveying process.

[0010] Furthermore, the vacuum buffer chamber has an ellipsoidal structure, with its major axis parallel to the axis of the conveying cavity, and its volume is 3 to 5 times that of the conveying cavity.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The vacuum buffer chamber adopts an ellipsoidal structure with its major axis parallel to the axis of the conveying cavity. This structure can reduce the overall height of the device while ensuring the buffer volume, making the device more compact; The volume of the vacuum buffer chamber is set to 3 to 5 times the volume of the conveying cavity, providing sufficient buffer space for pressure fluctuations. When the pressure in the conveying cavity suddenly increases, the vacuum buffer chamber can quickly absorb the excess pressure and disperse it into a larger space, effectively reducing the impact of pressure peaks on the conveying system.

[0012] Furthermore, the anti-backflow valve plate has a fan-shaped structure, the central angle of the anti-backflow valve plate is 100° to 120°, and the thickness of the anti-backflow valve plate is 1 / 10 to 1 / 8 of the inner diameter of the connecting channel.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The anti-backflow valve plate adopts a fan-shaped structure and sets the central angle to 100°~120°. This angle range allows the valve plate to stably close the connection channel under the action of gravity, while ensuring that the valve plate can be flexibly opened under pressure. The ratio between the valve plate thickness and the inner diameter of the connection channel ensures that the valve plate has sufficient rigidity to withstand the material pressure, and will not cause difficulty in opening due to excessive thickness. This achieves a balance between sealing performance and flexibility, enabling the valve plate to respond quickly to pressure changes.

[0014] Furthermore, the outer arc surface of the anti-backflow valve plate is provided with an arc-shaped protrusion, which extends radially along the anti-backflow valve plate, and the height of the arc-shaped protrusion is 1 / 2 to 2 / 3 of the thickness of the anti-backflow valve plate.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: an arc-shaped protrusion is set on the outer arc surface of the anti-backflow valve plate. When the valve plate closes the connecting channel, the arc-shaped protrusion forms a line contact or narrow surface contact with the inner wall of the channel. This contact method reduces the frictional resistance between the valve plate and the inner wall of the channel, enabling the valve plate to respond more sensitively to pressure changes and open or close. The radial extension of the arc-shaped protrusion also plays a guiding role, preventing the valve plate from shifting or getting stuck during opening and closing, thus improving the reliability and service life of the valve plate.

[0016] Furthermore, the inner wall of the connecting channel is provided with an annular sealing boss, which is located at the position where it contacts the anti-backflow valve plate when the anti-backflow valve plate closes the connecting channel. The width of the annular sealing boss is 1 / 15 to 1 / 10 of the inner diameter of the connecting channel.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: An annular sealing boss is set on the inner wall of the connecting channel. When the anti-backflow valve plate is closed, the annular sealing boss and the valve plate surface are in close contact to form a sealing surface. This boss-type sealing structure has a better sealing effect than the planar seal, and can effectively prevent paste-like seasonings from flowing back from the gap between the valve plate and the inner wall of the channel under pressure. The width of the annular sealing boss ensures that the sealing contact area is moderate, which not only ensures the sealing reliability, but also does not increase the force required to open the valve plate due to the excessive contact area, so that the sealing performance and response sensitivity are optimally matched.

[0018] Furthermore, the diameter of the hinge shaft is 1 / 8 to 1 / 6 of the inner diameter of the connecting channel, and the two ends of the hinge shaft are respectively fixed on opposite sides of the inner wall of the connecting channel. The hinge shaft passes through the mounting hole opened on the anti-backflow valve plate.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the diameter of the hinge shaft is set to 1 / 8 to 1 / 6 of the inner diameter of the connecting channel. This ratio gives the hinge shaft sufficient strength to withstand the pressure of the valve plate and the material, while avoiding the shaft diameter being too large and occupying too much channel space, which would affect the material flow. The two ends of the hinge shaft are fixed to opposite sides of the inner wall of the channel and pass through the mounting holes of the valve plate. This installation method allows the valve plate to rotate freely around the hinge shaft as the axis. The rotation process is smooth and not easy to shake, ensuring the accuracy and repeatability of the valve plate's opening and closing actions.

[0020] Furthermore, the width of the spiral guide groove remains consistent along the axial direction of the conveying cavity, and the groove width is 1 / 5 to 1 / 4 of the inner diameter of the conveying cavity. The pitch of the spiral guide groove is 1 to 2 times the inner diameter of the conveying cavity.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the width of the spiral guide groove remains consistent along the axial direction of the conveying cavity, providing a uniform and stable spiral flow channel for the paste-like seasoning, and avoiding flow turbulence caused by changes in groove width; the ratio between the groove width and the inner diameter of the conveying cavity, as well as the setting of the screw pitch, enable the material to form a continuous and uniform spiral streamline in the spiral guide groove, and the force on each part of the material is balanced, reducing the generation of turbulence and eddies, reducing energy loss during the conveying process, and at the same time, the spiral flow mode enables the material to maintain good fluidity during the conveying process and is not prone to stratification or sedimentation.

[0022] Furthermore, the conveying cavity and vacuum buffer chamber are made of stainless steel, and the anti-backflow valve plate is made of polytetrafluoroethylene.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the conveying chamber and the vacuum buffer chamber are made of stainless steel. Stainless steel has excellent corrosion resistance and surface smoothness, which can resist the corrosion of acid and alkali components in paste seasonings. At the same time, the smooth surface reduces material adhesion and residue, making it easy to clean and maintain. The anti-backflow valve plate is made of polytetrafluoroethylene (PTFE). This material has an extremely low coefficient of friction and excellent chemical corrosion resistance, which allows the valve plate to be used for a long time in the environment of paste seasonings without aging or performance degradation. At the same time, the low friction characteristics make the valve plate move more flexibly and smoothly.

[0024] Furthermore, the end of the feed interface is provided with an external threaded connection section, the length of which is 2 to 3 times the inner diameter of the feed interface, and the external threaded connection section is connected to the main body of the feed interface through a tapered transition section.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the external threaded connection section at the end of the feed interface provides a reliable threaded connection between the conveying chamber and the external feed pipe, which facilitates assembly, disassembly and maintenance; the length of the external threaded connection section ensures the connection strength and sealing performance; the external threaded connection section and the main body of the feed interface are connected by a tapered transition section. This tapered transition structure eliminates the stress concentration caused by the abrupt change in cross-section. At the same time, the tapered structure guides and straightens the paste-like seasoning entering the conveying chamber, so that the material enters the spiral guide channel smoothly, reducing turbulence and splashing during the feeding process, and improving feeding efficiency and conveying stability.

[0026] Compared with existing technologies, the beneficial effects of the vacuum buffer and anti-backflow conveying chamber for paste-like seasonings provided by this utility model are as follows: This utility model establishes an effective pressure buffering system by setting a vacuum buffer chamber above the conveying cavity and connecting it through a connecting channel. When pressure fluctuations occur during conveying, the vacuum buffer chamber can quickly absorb and release pressure, keeping the pressure inside the conveying cavity relatively stable and avoiding the impact and texture damage caused by sudden pressure changes on the material. The spiral guide channel changes the flow state of the material, causing it to form an orderly spiral flow during conveying. This flow mode not only improves conveying efficiency but also enhances… The continuous and stable conveying process is ensured by the anti-backflow valve plate, which adopts a passive gravity-sealed and pressure-opening working mode. It does not require external power or control system, and its structure is simple and reliable. When the conveying stops or the pressure decreases, the valve plate automatically closes and cuts off the connection between the vacuum buffer chamber and the conveying cavity, effectively preventing material backflow and ensuring the cleanliness of the conveying system and product quality. The optimized design of the size and shape of each component makes the entire device compact, sensitive in action, and easy to maintain. Compared with existing technologies, it has better pressure stability, more reliable anti-backflow performance, and a longer service life. It is particularly suitable for use in paste-like condiment production lines with high requirements for conveying stability and hygiene. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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.

[0028] Figure 1 A schematic diagram of a vacuum buffer anti-backflow conveying cavity for a paste-like condiment;

[0029] Figure 2 A cross-sectional view of a vacuum buffer anti-backflow conveying cavity for a paste-like condiment;

[0030] Figure 3 for Figure 2 Enlarged view of A in the middle;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Conveying chamber; 11. Spiral guide channel; 2. Vacuum buffer chamber; 3. Anti-backflow valve plate; 4. Feeding interface. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figures 1-3 The image shows a first embodiment of a vacuum buffer anti-backflow conveying cavity for a paste-like condiment provided by this utility model. In this embodiment, it includes a conveying cavity 1, a vacuum buffer chamber 2, an anti-backflow valve plate 3, and a feeding port 4. The conveying cavity has a cylindrical structure, and the inner wall of the conveying cavity is provided with a spiral guide groove 11, which extends clockwise from the feeding end to the discharging end of the conveying cavity. The vacuum buffer chamber is located above the conveying cavity and is connected to the conveying cavity through a connecting channel. The axis of the connecting channel forms an angle of 85° to 95° with the axis of the conveying cavity. The anti-backflow valve plate is located inside the connecting channel and is hinged to the inner wall of the connecting channel through a hinge shaft. The axis of the hinge shaft is perpendicular to the axis of the connecting channel. When the anti-backflow valve plate hangs down naturally under gravity, it closes the connecting channel. The feeding port is located at the feeding end of the conveying cavity, and the inner diameter of the feeding port is smaller than the inner diameter of the conveying cavity.

[0035] In the above technical solution, the depth of the spiral guide groove gradually decreases from the feed end to the discharge end along the axial direction of the conveying cavity, and the groove depth at the feed end is 2 to 3 times the groove depth at the discharge end.

[0036] Furthermore, in the above technical solution, the vacuum buffer chamber has an ellipsoidal structure, the major axis of the vacuum buffer chamber is parallel to the axis of the conveying cavity, and the volume of the vacuum buffer chamber is 3 to 5 times the volume of the conveying cavity.

[0037] Furthermore, in the above technical solution, the anti-backflow valve plate has a fan-shaped structure, the central angle of the anti-backflow valve plate is 100° to 120°, and the thickness of the anti-backflow valve plate is 1 / 10 to 1 / 8 of the inner diameter of the connecting channel.

[0038] Furthermore, in the above technical solution, the outer arc surface of the anti-backflow valve plate is provided with an arc-shaped protrusion, which extends radially along the anti-backflow valve plate, and the height of the arc-shaped protrusion is 1 / 2 to 2 / 3 of the thickness of the anti-backflow valve plate.

[0039] Furthermore, in the above technical solution, the inner wall of the connecting channel is provided with an annular sealing boss, which is located at the position where it contacts the anti-backflow valve plate when the anti-backflow valve plate closes the connecting channel, and the width of the annular sealing boss is 1 / 15 to 1 / 10 of the inner diameter of the connecting channel.

[0040] Furthermore, in the above technical solution, the diameter of the hinge shaft is 1 / 8 to 1 / 6 of the inner diameter of the connecting channel, the two ends of the hinge shaft are respectively fixed on opposite sides of the inner wall of the connecting channel, and the hinge shaft passes through the mounting hole opened on the anti-backflow valve plate.

[0041] Furthermore, in the above technical solution, the width of the spiral guide groove remains consistent along the axial direction of the conveying cavity, the groove width is 1 / 5 to 1 / 4 of the inner diameter of the conveying cavity, and the pitch of the spiral guide groove is 1 to 2 times the inner diameter of the conveying cavity.

[0042] Furthermore, in the above technical solution, the conveying cavity and vacuum buffer chamber are made of stainless steel, and the anti-backflow valve plate is made of polytetrafluoroethylene.

[0043] Furthermore, in the above technical solution, the end of the feed interface is provided with an external threaded connection section. The length of the external threaded connection section is 2 to 3 times the inner diameter of the feed interface. The external threaded connection section is connected to the main body of the feed interface through a tapered transition section.

[0044] The following is a specific embodiment 1 of this utility model: In this embodiment, the conveying cavity is made of 304 stainless steel. The cavity has a cylindrical structure with an inner diameter of 80mm, a length of 600mm, and a wall thickness of 5mm. The inner wall of the conveying cavity is machined with a spiral guide groove. The spiral guide groove extends clockwise from the inlet end to the outlet end. The groove width is 18mm, the pitch is 120mm, the groove depth at the inlet end is 12mm, and the groove depth at the outlet end is 5mm. The groove depth decreases linearly along the axial direction. The cross-section of the spiral guide groove is semi-circular, which guides the material to form a stable spiral flow and facilitates cleaning. The vacuum buffer chamber is welded from 304 stainless steel plate and has an ellipsoidal structure with a major axis length of 700mm, a minor axis length of 300mm, a wall thickness of 4mm, and an internal volume of approximately 32L, which is four times the volume of the conveying cavity (approximately 8L). The vacuum buffer chamber has a vacuum interface at the top for connecting a vacuum pump, and a 40mm diameter connecting channel at the bottom that connects to the delivery chamber. The axis of the connecting channel is perpendicular to the axis of the delivery chamber at a 90° angle, and the length of the connecting channel is 80mm. The anti-backflow valve plate is injection molded from PTFE material, with a fan-shaped structure, a central angle of 110°, a radius of 35mm, and a thickness of 5mm. The outer arc surface of the valve plate has three arc-shaped protrusions, each 4mm wide and 3mm high, evenly distributed radially. The hinge shaft is made of 316 stainless steel, with a diameter of 6mm and a length of 50mm. The two ends of the hinge shaft are fixed to opposite sides of the inner wall of the connecting channel by threaded connections. A 6.2mm diameter mounting hole is opened at the center of the valve plate, and a PTFE bushing is embedded in the mounting hole. The valve plate is fitted onto the hinge shaft through the bushing, with a 0.1mm gap between the bushing and the hinge shaft to ensure flexible rotation of the valve plate. The inner wall of the connecting channel is machined with an annular sealing boss 15mm from the side opening of the conveying cavity. The boss is 3mm wide and 2mm high, and its surface is polished to improve the sealing effect. The feed interface is made of 304 stainless steel tubing with an inner diameter of 60mm and a length of 150mm. The end is machined with an M64 external thread with a thread length of 40mm. The external thread section is connected to the feed interface body through a tapered transition section with a cone angle of 30° and a length of 25mm. In practical applications, the device in this embodiment is connected between the screw pump outlet and the filling machine inlet of the tomato sauce production line. The vacuum pump draws the pressure in the vacuum buffer chamber to -60 kPa, while the conveying pump operates at a pressure of 300 kPa and a flow rate of 2 m³ / h. The device effectively absorbs the pressure pulsations generated by the pump, controlling the pressure fluctuation at the filling machine inlet to within ±5 kPa, significantly improving filling accuracy. At the same time, the anti-backflow valve plate can completely close within 0.3 seconds each time the conveying stops, effectively preventing material backflow and maintaining the cleanliness of the pipeline and pump body.

[0045] The following is another specific embodiment 2 of this utility model: Embodiment 2 is based on Embodiment 1, but with improvements to the structure of the spiral guide channel. A micro-drainage hole with a diameter of 2mm is added to the bottom of the spiral guide channel, with one hole every 50mm along the spiral guide channel. The drainage hole penetrates the wall thickness of the conveying cavity and connects to the external drainage pipeline. This improvement allows the cleaning fluid to be quickly discharged through the drainage hole during cleaning of the conveying cavity, preventing accumulation in the spiral guide channel and improving cleaning efficiency and thoroughness. Simultaneously, the structure of the anti-backflow valve plate is optimized. A counterweight is added near the free end of the valve plate. The counterweight is made of stainless steel, weighs 15g, and is bolted to the surface of the valve plate. The addition of the counterweight increases the gravitational torque of the valve plate, increasing the sealing pressure when closed and further enhancing the anti-backflow effect. This is particularly suitable for conveying materials with high viscosity, such as peanut butter or sesame paste.

[0046] The following is another specific embodiment 3 of this utility model: Embodiment 3 improves upon Embodiment 1 by adding a partition structure inside the vacuum buffer chamber. The partition is made of 304 stainless steel plate with a thickness of 3mm and is arranged in a cross shape, dividing the internal space of the buffer chamber into four interconnected chambers, each with a volume of approximately 8L. The partition alters the airflow or material flow state within the buffer chamber. When pressure fluctuations are transmitted to the buffer chamber, the airflow or material flows between the chambers and collides and diffuses multiple times. This multiple dispersion and buffering process further reduces the amplitude of pressure fluctuations, resulting in a more significant pressure stabilization effect. Simultaneously, the connection angle between the connecting channel and the conveying cavity is adjusted, changing the original 90° vertical connection to an inclined connection at a 75° angle to the axis of the conveying cavity. This inclined arrangement makes the flow of material or gas into the connecting channel smoother, reducing flow resistance and turbulence, and improving the response speed of pressure transmission. This allows the vacuum buffer chamber to absorb and release pressure more quickly, making it suitable for production lines with large conveying flow rates or high pressure fluctuation frequencies.

[0047] Specifically, the principle of this invention is as follows: This device achieves pressure buffering and anti-backflow functions through the synergistic effect of three core components: a vacuum buffer chamber, a spiral guide channel, and an anti-backflow valve plate. The working principle of the vacuum buffer chamber is similar to an accumulator in a hydraulic system. When the pressure in the conveying chamber increases, some material or gas enters the vacuum buffer chamber through the connecting channel. Because the volume of the vacuum buffer chamber is much larger than that of the conveying chamber, the entering material or gas diffuses within a larger space, causing the pressure to drop rapidly, thus absorbing the pressure peak in the conveying chamber. When the pressure in the conveying chamber decreases, the pressure stored in the vacuum buffer chamber is released in the reverse direction through the connecting channel to compensate for the pressure drop in the conveying chamber. This bidirectional adjustment significantly reduces pressure fluctuations in the conveying chamber, maintaining a stable conveying process. The spiral guide channel changes the flow pattern of the material in the conveying chamber. The material no longer flows simply axially but moves spirally along the spiral channel. This spiral flow increases the residence time and flow path of the material in the chamber, making the force on each part of the material more uniform. At the same time, the centrifugal force generated by the spiral flow presses the material against the inner wall of the chamber, enhancing the contact between the material and the guide channel, and improving the stability and continuity of the conveying process. The anti-backflow valve plate works on the principle of balancing gravity and pressure. Under normal conveying conditions, the pressure inside the conveying chamber is higher than that in the vacuum buffer chamber. The material or gas pressure pushes the valve plate against gravity to open, connecting the chamber and the buffer chamber. When conveying stops or the pressure reverses, the valve plate falls naturally under gravity to close the connection channel, blocking the path of material backflow. Because the valve plate is hinged and equipped with an annular sealing boss, it can achieve rapid response and reliable sealing, effectively preventing backflow. The synergistic effect of these three components forms a complete pressure control and anti-backflow system, fundamentally solving the problems of pressure fluctuations and backflow during the conveying of paste-like seasonings.

[0048] The specific operation or use method of this utility model is as follows: First, connect the feed interface to the feed pipe through the external threaded connection section, ensuring a firm and good seal. Before starting the conveying process, check whether the vacuum buffer chamber is in a vacuum or low-pressure state. If it is the first time using it or restarting it after a long period of inactivity, the air in the buffer chamber needs to be extracted to a negative pressure state using a vacuum pump, generally controlled within the range of -50kPa to -80kPa. Start the conveying pump, and the paste-like seasoning enters the conveying chamber through the feed interface. Under the guidance of the spiral guide groove, the material forms a spiral flow and moves towards the discharge end. During the conveying process, the pressure in the conveying chamber will fluctuate periodically with the operation of the pump. When the pressure rises above the pressure in the vacuum buffer chamber, the anti-backflow valve plate opens upward against gravity under the action of the pressure difference. Some material or gas enters the vacuum buffer chamber through the connecting channel, and the buffer chamber absorbs the excess pressure, causing the pressure in the conveying chamber to drop. When the pump pressure decreases, the pressure stored in the buffer chamber acts in reverse on the conveying chamber through the connecting channel, compensating for the pressure drop. Throughout the process, the valve plate automatically adjusts the opening angle according to the pressure change without manual intervention. When it is necessary to stop the conveying process, first turn off the conveying pump. At this time, the pressure in the conveying chamber will drop rapidly, and the anti-backflow valve plate will immediately close under gravity, sealing the connection channel and preventing material or residual pressure in the vacuum buffer chamber from flowing back into the conveying chamber. During the entire operation, it is recommended to check the pressure status of the vacuum buffer chamber every 4 to 6 hours, and perform vacuum replenishment if necessary to maintain the optimal working condition of the buffer chamber.

Claims

1. A vacuum buffer anti-backflow conveying cavity for a paste-like seasoning, characterized in that, The system includes a conveying chamber, a vacuum buffer chamber, an anti-backflow valve plate, and a feed inlet. The conveying chamber has a cylindrical structure, and its inner wall is provided with a spiral guide groove that extends clockwise from the feed end to the discharge end. The vacuum buffer chamber is located above the conveying chamber and is connected to it via a connecting channel. The axis of the connecting channel forms an angle of 85° to 95° with the axis of the conveying chamber. The anti-backflow valve plate is located within the connecting channel and is hinged to the inner wall of the connecting channel via a hinge shaft. The axis of the hinge shaft is perpendicular to the axis of the connecting channel. When the anti-backflow valve plate naturally droops under gravity, it closes the connecting channel. The feed inlet is located at the feed end of the conveying chamber, and its inner diameter is smaller than that of the conveying chamber.

2. The vacuum buffer anti-backflow conveying cavity for a paste-like seasoning according to claim 1, characterized in that, The depth of the spiral guide groove gradually decreases from the feed end to the discharge end along the axial direction of the conveying cavity, and the groove depth at the feed end is 2 to 3 times the groove depth at the discharge end.

3. The vacuum buffer anti-backflow conveying cavity for a paste-like seasoning according to claim 2, characterized in that, The vacuum buffer chamber has an ellipsoidal structure, with its major axis parallel to the axis of the conveying cavity, and its volume is 3 to 5 times that of the conveying cavity.

4. The vacuum buffer anti-backflow conveying cavity for a paste-like seasoning according to claim 3, characterized in that, The anti-backflow valve plate has a fan-shaped structure, with a central angle of 100° to 120° and a thickness of 1 / 10 to 1 / 8 of the inner diameter of the connecting channel.

5. The vacuum buffer anti-backflow conveying cavity for a paste-like seasoning according to claim 4, characterized in that, The outer arc surface of the anti-backflow valve plate is provided with an arc-shaped protrusion. The arc-shaped protrusion extends radially along the anti-backflow valve plate, and the height of the arc-shaped protrusion is 1 / 2 to 2 / 3 of the thickness of the anti-backflow valve plate.

6. The vacuum buffer anti-backflow conveying cavity for a paste-like seasoning according to claim 5, characterized in that, The inner wall of the connecting channel is provided with an annular sealing boss. The annular sealing boss is located at the position where it contacts the anti-backflow valve plate when the anti-backflow valve plate closes the connecting channel. The width of the annular sealing boss is 1 / 15 to 1 / 10 of the inner diameter of the connecting channel.

7. The vacuum buffer anti-backflow conveying cavity for a paste-like seasoning according to claim 6, characterized in that, The diameter of the hinge shaft is 1 / 8 to 1 / 6 of the inner diameter of the connecting channel. The two ends of the hinge shaft are fixed on opposite sides of the inner wall of the connecting channel, and the hinge shaft passes through the mounting hole opened on the anti-backflow valve plate.

8. The vacuum buffer anti-backflow conveying cavity for a paste-like seasoning according to claim 7, characterized in that, The width of the spiral guide groove remains consistent along the axial direction of the conveying cavity, and the groove width is 1 / 5 to 1 / 4 of the inner diameter of the conveying cavity. The pitch of the spiral guide groove is 1 to 2 times the inner diameter of the conveying cavity.

9. The vacuum buffer anti-backflow conveying cavity for a paste-like seasoning according to claim 8, characterized in that, The conveying cavity and vacuum buffer chamber are made of stainless steel, and the anti-backflow valve plate is made of polytetrafluoroethylene.

10. The vacuum buffer anti-backflow conveying cavity for a paste-like seasoning according to claim 9, characterized in that, The end of the feed interface is provided with an external threaded connection section. The length of the external threaded connection section is 2 to 3 times the inner diameter of the feed interface. The external threaded connection section is connected to the main body of the feed interface through a tapered transition section.

Images