High-efficiency air-extracting structure of rolling vacuum machine

Abstract

The utility model discloses a kind of high-efficiency air extraction structure of rolling vacuum machine, belong to vacuum packaging machinery field, including air extraction seat, annular cavity is in air extraction seat, cross baffle is provided in annular cavity, to be sequentially separated into pre-extraction cavity, high vacuum cavity, fine extraction cavity and cooperation cavity by annular cavity, pre-extraction cavity, high vacuum cavity, fine extraction cavity bottom are provided with air extraction interface, multiple air extraction interfaces are connected with Roots pump, diffusion pump and molecular pump by air extraction pipe respectively. Annular cavity is separated into pre-extraction cavity, high vacuum cavity, fine extraction cavity by the cross baffle being set, annular cavity is separated into multiple independent chambers, reduce the mutual interference of different vacuum degree airflow, then by the Roots pump being set, diffusion pump and molecular pump are respectively extracted vacuum to pre-extraction cavity, high vacuum cavity, fine extraction cavity, air extraction process is disassembled into coarse extraction, high extraction, fine extraction, avoid the load waste of high vacuum system processing large amount of air when single-cavity air extraction, thereby reduce the energy consumption of vacuum system.

Description

Technical Field

[0001] This utility model relates to the field of vacuum packaging machinery technology, and more specifically, to a high-efficiency air extraction structure for a rolling vacuum machine. Background Technology

[0002] As a core type of continuous vacuum packaging equipment, the rolling vacuum machine has been widely used in mass packaging production due to its advantage of enabling uninterrupted air extraction from the packaged goods. Its working principle mainly involves a rotating disc driving the packaged goods in a circular motion. During this movement, the air extraction structure removes air from the packaged goods, thus achieving a vacuum seal.

[0003] However, most existing rolling vacuum machines adopt a "single-chamber, single-pump" evacuation mode, meaning one evacuation chamber corresponds to one vacuum system, which must simultaneously handle the full-range evacuation process from atmospheric pressure to high vacuum within the packaged goods. Since high-vacuum systems (such as diffusion pumps and molecular pumps) directly handle large volumes of atmospheric pressure air, not only is the evacuation load high, but the "high-vacuum system adapting to low-vacuum conditions" also leads to energy waste, making it difficult to meet the demands of fast-paced production. Furthermore, the lack of an effective airflow guiding structure within the evacuation chamber allows air to easily form vortex dead zones, causing some air to stagnate, further prolonging evacuation time and reducing overall production efficiency.

[0004] In view of this, the present invention is proposed to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency pumping structure for a rolling vacuum machine, so as to solve the technical problem of low pumping efficiency in existing rolling vacuum machine pumping structures.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A high-efficiency pumping structure for a rolling vacuum machine includes a pumping base with an annular cavity inside. A cross baffle is provided inside the annular cavity to divide the annular cavity into a pre-pumping cavity, a high-vacuum cavity, a fine-pumping cavity, and a matching cavity in sequence. Pumping ports are provided at the bottom of the pre-pumping cavity, the high-vacuum cavity, and the fine-pumping cavity. Multiple pumping ports are connected to a Roots pump, a diffusion pump, and a molecular pump through pumping pipes, respectively. Arc-shaped guide ribs are provided on the arc-shaped inner walls of the pre-evacuation chamber, high vacuum chamber, and fine evacuation chamber, and the number of arc-shaped guide ribs in the pre-evacuation chamber, high vacuum chamber, and fine evacuation chamber gradually increases.

[0007] Furthermore, an annular groove is provided on the inner wall of the upper end of the vacuum seat. The annular groove is located above the cross baffle. An annular sealing strip is provided in the annular groove. The annular sealing strip includes a vertical section and a horizontal section. The vertical section is located in the annular groove, and the horizontal section protrudes from the annular groove. A turntable is provided on the horizontal section. The circumferential wall of the turntable is in frictional connection with the vertical section. A connecting shaft is coaxially fixed on the turntable. The connecting shaft is connected to the output end of the rolling vacuum machine through a coupling.

[0008] Furthermore, the horizontal section is a polytetrafluoroethylene wear-resistant layer, and the vertical section is a silicone rubber elastic layer.

[0009] Furthermore, the cross baffle is provided with an upper top plate, and the upper top plate has multiple arc-shaped grooves that are respectively connected to the pre-evacuation chamber, the high vacuum chamber, and the fine evacuation chamber. The turntable has multiple air extraction holes, and when the turntable rotates, the air extraction holes slide along the arc-shaped grooves.

[0010] Furthermore, it also includes a sealing mechanism, which includes sealing blocks and mounting grooves disposed on both sides of the air extraction port; The sealing block has a sealing groove on the side near the mounting groove. A sliding slider is installed in the mounting groove. The slider is driven by an electric push rod. A rolling pressure roller is installed on the slider. The rolling pressure roller is driven by a geared motor. The edge of the rolling pressure roller is slidably connected to the sealing groove. A heating strip is installed in the sealing groove.

[0011] Furthermore, a pressure sensing component is also provided on the inner wall of the vacuum chamber. The pressure sensing component includes multiple pressure sensors, which are located on the inner walls of the pre-vacuum chamber, high vacuum chamber, and fine vacuum chamber, respectively. The pressure sensors are electrically connected to the control system of the rolling vacuum machine.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The annular cavity is divided into a pre-evacuation chamber, a high-vacuum chamber, and a fine-evacuation chamber by a cross-shaped baffle, thus reducing mutual interference between airflows at different vacuum levels. Then, the pre-evacuation chamber, high-vacuum chamber, and fine-evacuation chamber are evacuated by a Roots pump, a diffusion pump, and a molecular pump, respectively. The evacuation process is broken down into rough evacuation, high evacuation, and fine evacuation, avoiding the waste of the high-vacuum system's load of handling a large amount of air when evacuating a single chamber, thereby reducing the energy consumption of the vacuum system.

[0013] 2. By setting arc-shaped guide ribs on the inner walls of the pre-evacuation chamber, high vacuum chamber, and fine evacuation chamber, the airflow in the chamber is guided, avoiding the formation of vortex dead zones caused by turbulent airflow in traditional chambers. The number of arc-shaped guide ribs in the pre-evacuation chamber, high vacuum chamber, and fine evacuation chamber gradually increases, thereby adapting to the vacuum level of different chambers, enhancing airflow guidance, and reducing evacuation time. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the high-efficiency pumping structure of the rolling vacuum machine provided in the embodiments of this application; Figure 2 for Figure 1 A schematic diagram of the structure after removing the turntable and sealing mechanism; Figure 3 A schematic diagram of the internal structure of the pump seat of the high-efficiency pumping structure of the rolling vacuum machine provided in the embodiments of this application; Figure 4 This is a schematic diagram of the sealing mechanism of the high-efficiency air extraction structure of the rolling vacuum machine provided in the embodiments of this application.

[0015] Reference numerals: 1. Evacuation seat; 2. Top plate; 3. Arc-shaped groove; 4. Evacuation port; 5. Cross baffle; 6. Arc-shaped guide rib; 7. Pre-evacuation chamber; 8. High vacuum chamber; 9. Fine evacuation chamber; 10. Annular sealing strip; 11. Evacuation pipe; 12. Turntable; 13. Evacuation hole; 14. Mounting groove; 15. Slider; 16. Sealing block; 17. Rolling pressure roller; 18. Connecting shaft. Detailed Implementation

[0016] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0017] See Figures 1 to 4 As shown, a high-efficiency evacuation structure for a rolling vacuum machine includes an evacuation base 1, which is fixed on the frame of the rolling vacuum machine. The evacuation base 1 has an annular cavity, and a cross baffle 5 is provided inside the annular cavity to divide the annular cavity into a pre-evacuation cavity 7, a high vacuum cavity 8, a fine evacuation cavity 9, and a mating cavity in sequence. The bottom of the pre-evacuation cavity 7, the high vacuum cavity 8, and the fine evacuation cavity 9 are all provided with evacuation ports 4. Multiple evacuation ports 4 are respectively connected to a Roots pump, a diffusion pump, and a molecular pump through evacuation pipes 11. The arc-shaped inner walls of the pre-evacuation cavity 7, the high vacuum cavity 8, and the fine evacuation cavity 9 are all provided with arc-shaped flow guide ribs 6, and the number of arc-shaped flow guide ribs 6 in the pre-evacuation cavity 7, the high vacuum cavity 8, and the fine evacuation cavity 9 gradually increases.

[0018] In the above scheme, the annular cavity is divided into a pre-evacuation chamber 7, a high-vacuum chamber 8, and a fine-evacuation chamber 9 by a cross baffle 5, thus dividing the annular cavity into multiple independent chambers and reducing mutual interference between airflows at different vacuum levels. Then, the pre-evacuation chamber 7, the high-vacuum chamber 8, and the fine-evacuation chamber 9 are evacuated by a Roots pump, a diffusion pump, and a molecular pump, respectively. The evacuation process is broken down into rough evacuation, high evacuation, and fine evacuation, avoiding the waste of the high-vacuum system's load of handling a large amount of air when evacuating a single chamber, thereby reducing the energy consumption of the vacuum system. Furthermore, the airflow in the chamber is guided by arc-shaped guide ribs 6 on the inner walls of the pre-evacuation chamber 7, the high-vacuum chamber 8, and the fine-evacuation chamber 9, avoiding the formation of vortex dead zones due to airflow turbulence in traditional chambers. The number of arc-shaped guide ribs 6 in the pre-evacuation chamber 7, the high-vacuum chamber 8, and the fine-evacuation chamber 9 gradually increases, thereby adapting to the vacuum levels of different chambers, enhancing airflow guidance, and reducing evacuation time.

[0019] See some possible implementations. Figure 3 As shown, an annular groove is provided on the inner wall of the upper end of the vacuum seat 1. The annular groove is located above the cross baffle 5. An annular sealing strip 10 with interference fit is provided in the annular groove. The annular sealing strip 10 includes a vertical section and a horizontal section. The vertical section is located in the annular groove, and the horizontal section protrudes from the annular groove. A turntable 12 is provided on the horizontal section. The circumferential wall of the turntable 12 is frictionally connected to the vertical section. A connecting shaft 18 is coaxially fixed on the turntable 12. The connecting shaft 18 is connected to the output end of the rolling vacuum machine through a coupling.

[0020] In the above scheme, the rotating disk 12 is supported and sealed by the set annular sealing strip 10, replacing the traditional rigid seal. When the rolling vacuum machine is started, its output end drives the rotating disk 12 to rotate through the coupling and connecting shaft 18.

[0021] In some possible implementations, the horizontal section is a polytetrafluoroethylene wear-resistant layer and the vertical section is a silicone rubber elastic layer. The pre-tightening force of the silicone rubber elastic layer is used to achieve dynamic sealing, thereby accommodating the slight vibrations when the turntable 12 rotates. The polytetrafluoroethylene wear-resistant layer reduces friction and wear with the turntable 12.

[0022] See some possible implementations. Figure 2 As shown, an upper top plate 2 is fixedly installed on the cross baffle 5. The upper top plate 2 has multiple arc-shaped grooves 3 that are respectively connected to the pre-evacuation chamber 7, the high vacuum chamber 8, and the fine evacuation chamber 9. The turntable 12 has multiple air extraction holes 13. When the turntable 12 rotates, the air extraction holes 13 slide along the arc-shaped grooves 3.

[0023] In the above scheme, the packaged item is first placed at the air extraction hole 13 on the turntable 12. When the turntable 12 rotates, the air extraction hole 13 gradually connects with multiple arc-shaped grooves 3, thereby connecting the pre-extraction chamber 7, high vacuum chamber 8, and fine extraction chamber 9 with the air extraction port of the packaged item. Then, the packaged item is subjected to coarse extraction, high extraction, and fine extraction in sequence. This avoids the waste of the high vacuum system's load of handling a large amount of air when single-chamber extraction is used, thereby reducing the energy consumption of the vacuum system and reducing the extraction time.

[0024] See some possible implementations. Figure 4 As shown, the high-efficiency vacuum pump structure of the rolling vacuum machine provided in this application embodiment also includes a sealing mechanism. The sealing mechanism includes a sealing block 16 and a mounting groove 14 disposed on both sides of the suction hole 13. A sealing groove is opened on the side of the sealing block 16 near the mounting groove 14. A slidable slider 15 is installed in the mounting groove 14. The slider 15 is driven by an electric push rod. A rolling pressure roller 17 is disposed on the slider 15. The rolling pressure roller 17 is driven by a geared motor. The edge of the rolling pressure roller 17 is slidably connected to the sealing groove. A heating strip is disposed in the sealing groove.

[0025] In the above scheme, after the packaging is degassed, as the turntable 12 rotates, the packaging rotates to the area above the mating cavity, and the packaging is sealed with the annular cavity. At this time, the electric push rod, the geared motor and the heating strip start synchronously. The electric push rod starts and drives the rolling pressure roller 17 from front to back through its output end and the slider 15. The geared motor starts and drives the rolling pressure roller 17 through its output shaft. The rolling pressure roller 17 rotates and moves in the sealing groove. By squeezing the edge of the packaging and heating it, the air inlet of the packaging is sealed.

[0026] In some possible implementations, the inner wall of the vacuum chamber 1 is also provided with a pressure sensing component, which includes multiple pressure sensors located on the inner walls of the pre-vacuum chamber 7, the high vacuum chamber 8, and the fine vacuum chamber 9, respectively. The pressure sensors are electrically connected to the control system of the rolling vacuum machine.

[0027] In the above scheme, multiple pressure sensors are set to monitor the actual vacuum level of each chamber in real time, and the monitored data is fed back to the control system of the rolling vacuum machine through electrical signals. When the vacuum level of the chamber does not reach the set value, the control system can automatically adjust the pumping power of the corresponding chamber to avoid over-pumping or under-pumping, realize the adaptation of the pumping process, and reduce energy waste.

[0028] Working principle Pre-evacuation stage: The packaged goods enter the pre-evacuation chamber 7 along with the turntable 12. At this time, the pre-evacuation chamber 7 is roughly evacuated by a Roots pump (target vacuum degree 10^3 Pa). The arc-shaped guide ribs 6 in this chamber guide the air to flow along the arc-shaped path to the evacuation port 4, avoiding airflow turbulence. The horizontal section of the annular sealing strip is in close contact with the bottom of the turntable 12 to prevent outside air from entering the chamber, and the silicone rubber elastic layer of the vertical section adapts to the slight vibration of the turntable 12 to ensure the sealing effect.

[0029] High vacuum stage: When the packaged item enters the high vacuum chamber 8 region with the turntable 12, the pressure sensor detects that the vacuum level in this chamber has reached 10^3 Pa, and the control system automatically starts the diffusion pump (target vacuum level 10^-1 Pa). At this time, the arc-shaped guide ribs 6 of the high vacuum chamber 8 have a smaller spacing and stronger airflow guidance, accelerating the discharge of residual air in the packaged item; since the pre-evacuation chamber 7 has already removed more than 80% of the air, the high vacuum chamber does not need to process a large amount of air and can quickly reach the target vacuum level.

[0030] Fine-tuning stage: After the packaged goods enter the fine-tuning chamber 9, the pressure sensor reports that the vacuum level in this chamber has reached 10^-1 Pa, and the control system starts the molecular pump (target vacuum level 10^-3 Pa). Guided by the slow flow rate of the arc-shaped guide ribs 6, trace amounts of residual air in the packaged goods can be accurately expelled; at the same time, the pressure sensor monitors the vacuum level in real time, and when it reaches 10^-3 Pa, it feeds back to the control system, completing the evacuation process of the packaged goods.

[0031] Cyclic operation: As turntable 12 continues to rotate, subsequent packaging materials enter the three chambers in sequence to repeat the above-mentioned evacuation process, realizing "continuous staged evacuation". Throughout the process, each chamber works independently and does not interfere with each other. The sealing ring always maintains dynamic sealing, and the pressure sensor dynamically adjusts the evacuation power, ultimately achieving a high-efficiency, low-consumption, and low-residue evacuation effect.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency pumping structure for a rolling vacuum machine, comprising a pumping base (1), characterized in that, The vacuum seat (1) has an annular cavity, and a cross baffle (5) is provided in the annular cavity to divide the annular cavity into a pre-vacuum cavity (7), a high vacuum cavity (8), a fine vacuum cavity (9) and a matching cavity in sequence. The bottom of the pre-vacuum cavity (7), the high vacuum cavity (8) and the fine vacuum cavity (9) are all provided with a vacuum port (4). The multiple vacuum ports (4) are respectively connected to a Roots pump, a diffusion pump and a molecular pump through a vacuum pipe (11). The arc-shaped inner walls of the pre-extraction chamber (7), high vacuum chamber (8), and fine extraction chamber (9) are all provided with arc-shaped guide ribs (6), and the number of arc-shaped guide ribs (6) in the pre-extraction chamber (7), high vacuum chamber (8), and fine extraction chamber (9) gradually increases.

2. The high-efficiency pumping structure of the rolling vacuum machine according to claim 1, characterized in that, The upper inner wall of the vacuum seat (1) is provided with an annular groove. The annular groove is located above the cross baffle (5). An annular sealing strip (10) is provided in the annular groove. The annular sealing strip (10) includes a vertical section and a horizontal section. The vertical section is located in the annular groove, and the horizontal section protrudes from the annular groove. A turntable (12) is provided on the horizontal section. The circumferential wall of the turntable (12) is rubbed against the vertical section. A connecting shaft (18) is coaxially fixed on the turntable (12). The connecting shaft (18) is connected to the output end of the rolling vacuum machine through a coupling.

3. The high-efficiency pumping structure of the rolling vacuum machine according to claim 2, characterized in that, The horizontal section is a polytetrafluoroethylene wear-resistant layer, and the vertical section is a silicone rubber elastic layer.

4. The high-efficiency pumping structure of the rolling vacuum machine according to claim 3, characterized in that, The cross baffle (5) is provided with an upper top plate (2), and the upper top plate (2) is provided with multiple arc-shaped grooves (3) that are respectively connected to the pre-vacuum chamber (7), the high vacuum chamber (8), and the fine evacuation chamber (9). The turntable (12) is provided with multiple air extraction holes (13). When the turntable (12) rotates, the air extraction holes (13) slide along the arc-shaped grooves (3).

5. The high-efficiency pumping structure of the rolling vacuum machine according to claim 4, characterized in that, It also includes a sealing mechanism, which includes sealing blocks (16) and mounting grooves (14) disposed on both sides of the air extraction hole (13). The sealing block (16) has a sealing groove on the side near the mounting groove (14). A sliding slider (15) is installed in the mounting groove (14). The slider (15) is driven by an electric push rod. A rolling pressure roller (17) is provided on the slider (15). The rolling pressure roller (17) is driven by a geared motor. The edge of the rolling pressure roller (17) is slidably connected to the sealing groove. A heating strip is provided in the sealing groove.

6. The high-efficiency pumping structure of the rolling vacuum machine according to claim 1, characterized in that, The inner wall of the vacuum seat (1) is also provided with a pressure sensing component, which includes multiple pressure sensors. The multiple pressure sensors are located on the inner walls of the pre-vacuum chamber (7), the high vacuum chamber (8), and the fine vacuum chamber (9), respectively. The pressure sensors are electrically connected to the control system of the rolling vacuum machine.

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