Vacuum fresh-keeping machine

Abstract

The application discloses a vacuum fresh-keeping machine, which comprises a seat body, a control circuit and a flip cover installed on the upper part of the seat body, the upper surface of the seat body is a supporting surface, the lower surface of the flip cover is a buckling surface, the supporting surface gradually rises from the two sides to the middle, the shape of the buckling surface is matched with the supporting surface, the supporting surface and the buckling surface are both provided with a compression sealing strip, the compression sealing strip is located in front of a bag opening hot melting sealing assembly, a movable air suction nozzle is arranged on the seat body, the air suction nozzle is located at the highest position of the supporting surface, a driving device for driving the air suction nozzle to move is further arranged on the seat body, a liquid sensor is arranged on the front part of the air suction nozzle, the liquid sensor is electrically connected with a vacuum pump, the driving device and the bag opening hot melting sealing assembly, and the application can more cleanly suck the air in the bag body containing more liquid, and meanwhile, the liquid can be prevented from reaching the sealing position and affecting the hot sealing.

Description

Technical Field

[0001] This invention belongs to the field of vacuum packaging technology, and more specifically relates to a vacuum preservation machine. Background Technology

[0002] Chinese Patent Application No. 2021111192541 discloses an intelligent vacuum sealing machine, including a base, a control circuit and a flip cover installed on the upper part of the base. A latch is provided on the left and right sides of the flip cover. A vacuum device is installed in the inner cavity of the base or the flip cover. A bag mouth heat-melting sealing assembly is provided at the front of the base or the flip cover. The base is provided with a chamber. An independently set bracket assembly that can be moved out of the chamber is movably inserted into the upper part of the chamber. A horizontally extending air extraction groove is opened on the upper part of the bracket assembly. A drive assembly is located at the bottom of the chamber. The drive assembly abuts against or is connected to the bracket assembly. A locking mechanism that engages with the corresponding latch on each side of the bracket assembly is installed. The cavity is provided with at least one positioning buckle, and the bottom of the bracket assembly has a positioning chamber corresponding to the position of the positioning buckle, the positioning chamber being fitted into the corresponding positioning buckle. At least one of the positioning buckles is equipped with at least one first capacitor dielectric element that automatically determines whether there is liquid in the vacuum tank by detecting the change of the capacitor dielectric constant. The control circuit is electrically connected to the vacuum device, the bag opening heat-sealing assembly and the first capacitor dielectric element respectively.

[0003] Meanwhile, at least one second capacitor dielectric element for wet / dry sensing is provided on the bottom surface of the front part of the seat and / or the top surface of the front part of the flip cover, which is electrically connected to the control circuit. The second capacitor dielectric element extends a set width in the lateral direction. The control circuit is provided with an automatic switching unit for wet / dry vacuuming working mode and an RC oscillation capacitance constant detection circuit for providing periodic voltage to the second capacitor dielectric element. The RC oscillation capacitance constant detection circuit is electrically connected to the second capacitor dielectric element. The automatic switching unit for wet / dry vacuuming working mode is electrically connected to the vacuum pump and the bag opening heat-sealing assembly, respectively.

[0004] The aforementioned patented technology automatically identifies the dryness or wetness of the food inside the bag, automatically switches the working mode, and operates fully automatically and intelligently. During vacuuming, the bag containing liquid rests on the water-blocking platform. When the liquid reaches the second capacitor dielectric element, it can detect that there is liquid inside the bag and enter the wet vacuuming working mode.

[0005] In the aforementioned patent, the opening of the bag extends into the vacuum groove during vacuuming. Near the opening, it is pressed tightly by the upper sealing gasket on the cover and the integrated sealing gasket on the seat. However, if the pressing force is too large, vacuuming will be difficult and the vacuuming efficiency will be low; if the pressing force is too small, air leakage may occur. For example, Chinese patent application number 201210580158.1 uses an adjustable sealing plate to make the clamping force between the sealing rings adjustable and controllable to ensure sealing performance.

[0006] When there is liquid inside the bag, during the vacuuming process, air is extracted, and irregular wrinkles will form on the surface of the bag. When the vacuuming speed is fast, the air extraction speed is different in different positions in the horizontal direction inside the bag. That is, at this time, in some positions, the liquid is close to the opening of the bag, while in other positions there is still more air. If heat sealing is performed at this time, there will still be more air inside the bag. If the vacuuming continues, more liquid will be extracted. When there is more liquid passing through the sealing position, the heat sealing becomes more difficult, which may cause the seal to be weak or even fail. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a method for extracting air from a bag along a designated route, preventing leakage and ensuring extraction efficiency during the extraction process. For bags containing liquid, the curved support surface and the curved sealing strip create upward resistance for the liquid during vacuuming, causing it to reach the extraction nozzle more slowly, reducing air content, extending shelf life, and preventing liquid from reaching the heat-sealing assembly at the bag opening and affecting the heat seal.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a vacuum preservation machine, comprising a base, a control circuit, and a flip cover mounted on the upper part of the base. A fastening foot is provided on each of the left and right sides of the flip cover. A bag opening heat-sealing assembly is provided at the front of the base or the flip cover. A vacuum pump is provided on the base. The upper surface of the base is a supporting surface, and the lower surface of the flip cover is a fastening surface. The supporting surface gradually rises from both sides to the middle. The shape of the fastening surface matches the supporting surface. A pressing sealing strip is provided on both the supporting surface and the fastening surface. The pressing sealing strip is located in front of the bag opening heat-sealing assembly. The base is provided with a suction nozzle that can move back and forth. The suction nozzle is located at the highest point of the support surface. When the suction nozzle extends, it reaches the front of the sealing strip. When the suction nozzle retracts, it reaches the rear of the bag opening heat-melt sealing assembly. The base is also provided with a drive device to drive the suction nozzle to move. A liquid sensor is installed at the front of the air extraction nozzle, and the liquid sensor is electrically connected to the vacuum pump, the drive device, and the bag opening heat-sealing assembly.

[0009] Furthermore, the compression sealing strip bends gradually backward from both sides towards the middle, and the bag opening heat-melt sealing assembly bends gradually backward from both sides towards the middle.

[0010] Furthermore, a handle is provided on the rear side of the base and / or the flip cover, and the entire refrigerator rotates 90 degrees when the handle is lifted.

[0011] Furthermore, a lower opening bag assembly is provided above the base body, located in the middle of the horizontal direction of the base body. The lower opening bag assembly includes a lower fixed base, a lower suction cup, and a telescopic tube. A guide cylinder and an air passage are provided on the lower fixed base, connected to a vacuum pump. The telescopic tube is connected to the fixed base and communicates with the air passage. The lower suction cup is fixed above the telescopic tube and communicates with it. The telescopic tube is located inside the guide cylinder, and a spring is provided inside the guide cylinder to extend the telescopic tube. An upper opening bag assembly is provided on the flip cover, including an upper suction cup connected to a vacuum pump. The upper suction cup is positioned opposite the lower suction cup. The bottom end of the upper suction cup and the top end of the lower suction cup are higher than the top end of the suction nozzle. The upper and lower opening bag assemblies are located behind the bag opening heat-sealing assembly. When the suction nozzle retracts, it reaches behind the upper and lower suction cups.

[0012] Furthermore, the base is provided with a liquid storage chamber, the bottom of which is arranged at an incline. A drain outlet is provided at the lowest point of the liquid storage chamber, and a plug is provided at the drain outlet. The vacuum pump is connected to the liquid storage chamber, and the liquid storage chamber is connected to a main air pipe. The main air pipe is connected to a hose and the air passage of the lower fixed base through a two-position three-way valve. The hose is connected to a suction nozzle, and the lower suction cup is connected to the air passage of the lower fixed base.

[0013] Furthermore, the drive device includes a rotating shaft, a drive motor, and a crank arm. The air extraction nozzle is connected to the crank arm, and the rotating shaft connects the drive motor and the crank arm. The rotating shaft is arranged vertically, and the drive motor causes the crank arm and the air extraction nozzle to rotate in the horizontal plane.

[0014] Furthermore, the base body has several through holes behind the bag opening heat-sealing assembly, and the flip cover has several positioning holes corresponding to the through holes. Positioning pins are installed in the through holes, and the base body is equipped with a lifting device connected to the positioning pins.

[0015] Furthermore, the lifting device includes an electromagnetic coil and an iron plate, with the electromagnetic coil fixed above the base and the iron plate connected to a positioning pin.

[0016] Furthermore, the cross-section of the suction nozzle is elliptical, the liquid sensor is a water immersion sensor, and the hardness of the two sides of the compression sealing strip is greater than the hardness of the middle.

[0017] Further methods include the following vacuuming techniques: S1, Laying the bag: Place the open side of the bag on the support surface so that the bottom of the bag covers the through hole and the lower suction cup; S2, Initial Fixing: Fasten the flap, lock the flap and the base, press the sealing strip to fix the bag body, and at the same time press the upper suction cup to press the top of the bag body; S3, Secondary Fixing: Activate the lifting device to allow the positioning pin to pass through the through hole, penetrate the bag body into the positioning hole, and completely fix the bag body. S4, Adjust posture: Lift the handle to rotate the entire refrigeration machine 90 degrees, suspending the bag in the air; S5, Open Bag: Start the vacuum pump and connect the main air pipe to the air channel through the two-position three-way valve. The upper and lower suction cups generate negative pressure to adsorb the top and bottom of the bag respectively. As the negative pressure increases, the telescopic tube will contract along the guide tube, and the lower suction cup will take the bottom of the bag away from the top, thus opening the bag. S6, Insert the suction nozzle: The suction nozzle is rotated horizontally by the drive device, and the suction nozzle is inserted into the bag body through the opening of the bag body until the front end of the suction nozzle passes through the sealing strip. S7, Start Evacuation: Connect the main air pipe to the hose through the two-position three-way valve, and the suction nozzle will generate negative pressure to draw air out of the bag. S8, Vacuuming Completed: Select the time point to complete vacuuming based on the vacuuming status. State 1: The water immersion sensor inside the vacuum nozzle detects liquid and immediately stops pumping; State 2: The pressure sensor connected to the vacuum pump reaches the pressure threshold and immediately stops pumping. S9, Sealing: After the air extraction is completed, the air extraction nozzle is driven to leave the bag body and return to its original position, and the bag opening heat-sealing assembly works to seal the bag. S10, Remove the bag: Open the flap and remove the bag that has been evacuated and sealed.

[0018] Compared with the prior art, the beneficial effects of the present invention are: it can control the timing of air extraction based on the dryness or wetness of the contents inside the bag; when there is liquid inside the bag, it can first extract the air, keeping the liquid away from the air extraction nozzle, delaying the time it takes for the liquid to move towards the air extraction nozzle; and it can stop in time after the gas is completely extracted, making the air extraction from the bag containing liquid more thorough, while simultaneously preventing the liquid from reaching the heat-sealing position and ensuring the quality of heat sealing. Attached Figure Description

[0019] Figure 1 The three-dimensional structure of the vacuum preservation machine of the present invention Figure 1 (When the flip cover is separated from the base); Figure 2 The three-dimensional structure of the vacuum preservation machine of the present invention Figure 2 (The bottom surface of the base is not shown); Figure 3 This is a front view of the vacuum preservation machine of the present invention; Figure 4This is a bottom view of the vacuum preservation machine of the present invention (the bottom surface of the base is not shown). Figure 5 for Figure 4 Cross-sectional view at point AA; Figure 6 This is a side view of the vacuum preservation machine of the present invention; Figure 7 This is a three-dimensional structural diagram of the base in this invention; Figure 8 This is a top view of the base in this invention; Figure 9 This is a schematic diagram showing the bag placed on the base. Figure 10 This is a three-dimensional structural diagram of the flip cover in this invention; Figure 11 This is a bottom view of the flip cover in this invention; Figure 12 This is a three-dimensional structural diagram of the air extraction nozzle in this invention; Figure 13 This is a cross-sectional view of the bag during air extraction. Figure 14 This is a cross-sectional view of the compression sealing strip in this invention; Figure 15 This is a front view of the bag during air extraction. Figure 16 This is a cross-sectional view of the bag during air extraction in another embodiment; Figure 17 This is a schematic diagram showing the positions of the compression sealing strip and the bag opening heat-melt sealing assembly in another embodiment.

[0020] Reference numerals: 10, base; 101, support surface; 1011, through hole; 11, sealing strip; 111, sealing cavity; 12, hot melt sealing assembly for bag opening; 131, positioning pin; 132, electromagnetic coil; 133, iron sheet; 20, flap; 201, fastening surface; 2011, positioning hole; 30, handle; 40, drive motor; 41, rotating shaft; 42, crank arm; 50, vacuum pump; 51, liquid storage tank; 52, main air pipe; 53, hose; 61, lower fixed base; 611, air passage; 62, guide tube; 63, telescopic tube; 64, spring; 65, lower suction cup; 66, upper suction cup; 661, first connecting pipe; 662, second connecting pipe; 70, suction nozzle; 80, limit stop; 90, water immersion sensor; 100, bag body. Detailed Implementation

[0021] Reference Figures 1 to 17 The embodiments of the vacuum preservation machine of the present invention will be further described.

[0022] In the description of this invention, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this invention, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0024] A vacuum preservation machine includes a base 10, a control circuit, and a flip cover 20 mounted on the upper part of the base 10. The flip cover 20 can be rotatably connected to the rear side of the base 10 using existing technology. A latch is provided on each of the left and right sides of the flip cover 20. A locking mechanism that engages with the latches is provided on the base 10, and its structure is the same as in existing technology. The locking mechanism includes a locking block and a push block for pushing the locking block. The locking block is slidably mounted on the base 10 in the lateral direction. The first side of the push block is fixed to a bracket assembly, and the second side of the push block is in a transmission engagement with the first side of the locking block. The second side of the locking block engages with the corresponding latch. Of course, the latches and locks... The positions of the cover mechanism can be interchanged. A bag opening heat-melt sealing assembly 12 is provided at the front of the base 10 or the flap 20. The structure and sealing principle of the bag opening heat-melt sealing assembly 12 can be achieved using existing technology. A vacuum pump 50 is provided on the base 10. The upper surface of the base 10 is the support surface 101, and the lower surface of the flap 20 is the fastening surface 201. The support surface 101 gradually rises from both sides to the middle. The shape of the fastening surface 201 matches the support surface 101. A pressing sealing strip 11 is provided on both the support surface 101 and the fastening surface 201. The pressing sealing strip 11 is located in front of the bag opening heat-melt sealing assembly. The base 10 is provided with a suction nozzle 70 that can move back and forth. The suction nozzle 70 is located at the highest point of the support surface 101. When the suction nozzle 70 extends, it reaches the front of the pressing sealing strip 11. When the suction nozzle 70 retracts, it reaches the rear of the bag opening heat-melt sealing assembly 12. The base 10 is also provided with a driving device for driving the suction nozzle 70 to move. A liquid sensor is installed at the front of the suction nozzle 70, and the liquid sensor is electrically connected to the vacuum pump 50, the drive device and the bag opening heat-melt sealing assembly 12.

[0025] In this embodiment, as Figure 3 As shown, the supporting surface 101 of the seat 10 is a convex arc surface, the fastening surface 201 of the flip cover 20 is a concave arc surface, and the highest point on the seat 10 is the air extraction area from front to back, that is, the air extraction nozzle 70 is in the air extraction area.

[0026] like Figure 8 and 9 As shown, to limit the sealing position of the bag body 100, a limiting block 80 is preferably provided on the seat body 10 behind the bag opening heat-melt sealing assembly 12. There can be two or more limiting blocks 80, which are arranged symmetrically in the horizontal direction. The limiting block 80 in the middle avoids the air extraction area, and the highest point of the limiting block 80 is higher than the top of the pressing sealing strip 11 on the seat body 10.

[0027] The preferred vacuum pump 50 is connected to a pressure sensor, which is the same as the existing structure, and is used to detect the negative pressure in the entire pipeline. When the predetermined negative pressure value (threshold) is reached, it is determined that the gas in the bag 100 has been completely extracted.

[0028] When the bag 100 contains a small amount of liquid (capable of flowing), it can be vacuumed by laying it flat. Specifically: the opening of the bag 100 faces and abuts against the limiting block 80, the surface of the bag 100 presses against the sealing strip 11 of the seat 10, and the suction nozzle 70 is inserted into the opening of the bag 100. The flap 20 is then fastened, so that the flap 20 and the sealing strip 11 of the seat 10 cooperate to press the bag 100 tightly and seal the area except for the area where the suction nozzle 70 is located. At this time, the part of the bag 100 resting on the seat 10 is arc-shaped, that is, the two sides are lower and the middle is higher. When the vacuum is started, the air inside the bag 100 will gather towards the middle and be discharged through the suction nozzle 70, while the heavier liquid will be difficult to expel due to gravity. The liquid flows towards the center until all the air is expelled. At this point, suction continues, and the liquid moves towards the center along the inclined support surface 101. When the liquid enters the suction nozzle 70, it is detected by the liquid sensor. The liquid sensor promptly transmits a signal to the vacuum pump 50 and the drive device. The drive device causes the suction nozzle 70 to retract and move away from the pressure sealing strip 11 and the bag opening heat-sealing assembly 12. After it moves away, the pressure sealing strip 11, which was originally at the suction nozzle 70, will immediately close the opening of the bag body 100 to prevent gas from entering and also to prevent liquid from flowing out into the area where the bag opening heat-sealing assembly 12 is located. At the same time, the bag opening heat-sealing assembly 12 works to seal the opening of the bag body 100, completing the vacuuming and heat-sealing operations.

[0029] When the bag 100 contains a significant amount of liquid, a vacuum can be created using a suspension method. In this case, the entire refrigerator can be rotated 90 degrees so that the front of the refrigerator faces downwards. The bag 100 is clamped and fixed between the flip cover 20 and the base 10 by the pressure sealing strip 11, suspending the entire bag 100 in the air. At this time, the vacuum nozzle 70 is activated to create a vacuum. The liquid inside the bag 100 will find it more difficult to rise, preventing the liquid from being expelled before the air. When the liquid reaches the vacuum nozzle 70, it is detected by the liquid sensor. The volume sensor promptly transmits the signal to the vacuum pump 50 and the drive device. The drive device causes the suction nozzle 70 to retract and move away from the pressure sealing strip 11 and the bag opening heat-sealing assembly 12. After it moves away, the pressure sealing strip 11, which was originally at the suction nozzle 70, will immediately close the opening of the bag body 100 to prevent gas from entering and to prevent liquid from flowing out into the area where the bag opening heat-sealing assembly 12 is located. At the same time, the bag opening heat-sealing assembly 12 works to seal the opening of the bag body 100, completing the vacuuming and heat-sealing actions.

[0030] like Figure 7 As shown, in this preferred embodiment, the compression sealing strip 11 gradually bends backward from both sides toward the middle, and the bag opening heat-melt sealing assembly 12 gradually bends backward from both sides toward the middle.

[0031] When there is a large amount of liquid inside the bag (100), a vacuum should be created using a suspension method, such as... Figure 9 As shown, the bag 100 is fixedly clamped between the flap 20 and the base 10. At this time, the bag 100 is suspended in the air, and the suction area is still at its highest point. The left and right sides are still far from the suction area. During suction, the gas inside the bag 100 is extracted, and the liquid inside the bag 100 needs to move from the lower sides to the higher center. Figure 15 As shown, extending the path distance of the liquid to the extraction area allows the air inside the bag 100 to be extracted more quickly and cleanly.

[0032] When there is almost no liquid inside the bag 100, vacuuming can be performed in the same way as existing technology. At this time, the vacuum pump 50 will stop when the pressure sensor reaches the threshold. This pressure sensor is electrically connected to the vacuum pump 50, the drive device and the bag opening heat-sealing assembly 12. That is, when the pressure sensor reaches the threshold, the vacuum pump 50 stops, the drive device causes the suction nozzle 70 to disengage from the bag 100, and the bag opening heat-sealing assembly 12 works to heat-seal the opening of the bag 100.

[0033] like Figure 4 and 8 As shown, a handle 30 is provided on the rear side of the base 10 and / or the flip cover 20. When the handle 30 is lifted, the entire refrigeration unit rotates 90 degrees. The handle 30 facilitates vacuuming by suspension.

[0034] like Figure 5 and7 As shown, a lower opening bag assembly is provided above the seat 10, located at the middle of the seat 10's transverse direction. The lower opening bag assembly includes a lower fixed seat 61, a lower suction cup 65, and a telescopic tube 63. A guide cylinder 62 is provided on the lower fixed seat 61, and an air passage 611 is provided on the lower fixed seat 61, connected to a vacuum pump 50. The telescopic tube 63 is connected to the fixed seat and communicates with the air passage 611. The lower suction cup 65 is fixed above the telescopic tube 63 and communicates with the telescopic tube 63. The telescopic tube 63 is located inside the guide cylinder 62, and a spring 64 is provided inside the guide cylinder 62 to extend the telescopic tube 63. Figure 5 and 10 As shown, the flip cover 20 is provided with an upper opening bag assembly, which includes an upper suction cup 66 connected to a vacuum pump 50. The upper suction cup 66 is positioned opposite to the lower suction cup 65. The bottom end of the upper suction cup 66 and the top end of the lower suction cup 65 are higher than the top end of the suction nozzle 70. The upper opening bag assembly and the lower opening bag assembly are located behind the bag opening heat-sealing assembly 12. When the suction nozzle 70 retracts, it reaches behind the upper suction cup 66 and the lower suction cup 65.

[0035] Both the upper suction cup 66 and the lower suction cup 65 are located in front of the limiting block 80. That is, when the bag body 100 is placed on the support surface 101, the bag body 100 can cover the lower suction cup 65. When the flip cover 20 is closed, the upper suction cup 66 can fit against the bag body 100.

[0036] In this embodiment, multiple upper suction cups 66 and lower suction cups 65 can be provided. When the bag body 100 is placed on top, the opening side of the bag body 100 abuts against the limiting block 80, and the flip cover 20 closes. The flip cover 20 and the pressing sealing strip 11 on the seat 10 first temporarily seal the bag body 100. The upper suction cup 66 and lower suction cup 65 will clamp and fit against the opening of the bag body 100. At this time, the vacuum pump 50 is started, and the upper suction cup 66 and lower suction cup 65 respectively suck up the upper and lower surfaces of the bag body 100. As the negative pressure increases, the telescopic tube 63 will retract along the guide tube 62, causing the lower suction cup 65 to move away from the upper suction cup 66. Figure 5 As shown, the lower suction cup 65 will move downwards, while the upper suction cup 66 will not move; the opening of the bag body 100 will be opened, at which point both the upper and lower ends of the suction nozzle 70 are within the opened opening area. Then, the driving device will move the suction nozzle 70, extending it along the opened opening into the bag body 100, and squeezing out the compression sealing strip 11 in the suction area, extending it into the area to be vacuumed, as shown. Figure 13 As shown, then vacuuming begins, which eliminates the need to manually put the bag 100 onto the vacuum nozzle 70 beforehand, and also avoids moving or squeezing the bag 100 during the process of putting it onto the vacuum nozzle 70, causing the liquid inside the bag 100 to spill out.

[0037] The telescopic pipe 63 can be two pipe sections connected together, or it can be a corrugated pipe.

[0038] After the air extraction is completed, the negative pressure of the upper suction cup 66 and the lower suction cup 65 is lost, and they no longer adsorb onto the bag body 100. At the same time, there is no negative pressure in the telescopic tube 63. Under the action of the spring 64, the telescopic tube 63 will extend along the guide tube 62, and the lower suction cup 65 will return to its original position.

[0039] In this embodiment, to connect the vacuum pump 50 inside the base 10 to the upper suction cup 66 on the flip cover 20, a relatively flexible tube or bellows can be used to connect the base 10 and the flip cover 20. When the flip cover 20 is opened and closed, the tube or bellows can adaptively move and adjust. Alternatively, as... Figure 6 As shown, the base 10 has a first connecting pipe 661 connected to the vacuum pump 50, with the top end of the first connecting pipe 661 open. The flip cover 20 has a second connecting pipe 662 connected to the upper suction cup 66, with the bottom end of the second connecting pipe 662 open. The top end of the first connecting pipe 661 and the bottom end of the second connecting pipe 662 have sealing rings. When the flip cover 20 and the base 10 are fastened together, the second connecting pipe 662 and the first connecting pipe 661 are connected and closed, and the negative pressure can be smoothly transmitted to the upper suction cup 66. There is no need to arrange complex pipelines between the base 10 and the flip cover 20, and the leakage caused by the back-and-forth folding of the pipeline is also avoided.

[0040] like Figure 14 As shown, in this preferred embodiment, the hardness of the two sides of the compression sealing strip 11 is greater than that of the middle. The compression sealing strip 11 can be made of rubber as a whole, and its interior is hollow with compressible space. At the same time, the compression sealing strip 11 near the air extraction area is thinner, that is, the cross-section of the hollow area here is larger than the cross-section of the hollow areas on both sides. Therefore, the compression sealing strip 11 in the air extraction area is easier to deform. When the air extraction nozzle 70 is inserted through the opening of the bag body 100, it is easier to open the compression sealing strip 11 here. The compression sealing strip 11 in the non-air extraction area can make the sealed bag press and seal, especially when vacuuming in the suspension mode, it can ensure that the bag body 100 is stably suspended.

[0041] like Figure 12 As shown, in this embodiment, the preferred cross-section of the suction nozzle 70 is elliptical, and the liquid sensor is a water immersion sensor 90. The elliptical suction nozzle 70 is easier to pass through the sealing strip 11, while ensuring a larger cross-sectional area for rapid suction. Preferably, the suction nozzle 70 is made of a relatively hard material, such as stainless steel, to avoid deformation by the sealing strip 11. The water immersion sensor 90 can detect liquid entering the suction nozzle 70 in a timely manner. Of course, the liquid sensor can also be implemented using other second capacitor dielectric elements as described in prior art 2021111192541.

[0042] like Figure 2 , 4 As shown in Figure 5, in this preferred embodiment, the base 10 is provided with a liquid storage chamber. The bottom of the liquid storage chamber is arranged at an incline, and a drain outlet is provided at the lowest point of the liquid storage chamber. A plug is provided at the drain outlet. The vacuum pump 50 is connected to the liquid storage chamber, and the liquid storage chamber is connected to a main air pipe 52. The main air pipe 52 is connected to a hose 53 and an air passage 611 of the lower fixed base 61 through a two-position three-way valve. The hose 53 is connected to a suction nozzle 70, and the lower suction cup 65 is connected to the air passage 611 of the lower fixed base 61.

[0043] The liquid storage tank stores the liquid extracted by the suction nozzle 70, preventing it from directly entering the vacuum pump 50 and causing damage. The drain port allows for easy liquid discharge. The two-position three-way valve connects the main air pipe 52 to the air passage 611 or the hose 53. Before suction, the main air pipe 52 is connected to the air passage 611, allowing the lower and upper bag opening components to work together to open the bag 100, facilitating the insertion of the suction nozzle 70. The two-position three-way valve then connects the main air pipe 52 to the hose 53, enabling the suction operation of the suction nozzle 70.

[0044] like Figure 7 and 8 As shown, the preferred driving device in this embodiment includes a rotating shaft 41, a drive motor 40, and a crank arm 42. The air extraction nozzle 70 is connected to the crank arm 42. The rotating shaft 41 connects the drive motor 40 and the crank arm 42. The rotating shaft 41 is arranged vertically, and the drive motor 40 causes the crank arm 42 and the air extraction nozzle 70 to rotate in the horizontal plane.

[0045] In the initial state, the suction nozzle 70 is in Figure 8 Position B, during suction, rotate the suction nozzle 70 degrees clockwise. Figure 8 At position C, in this embodiment, a crank arm 42 is used to connect the air extraction nozzle 70, allowing it to rotate horizontally. This reduces the space occupied in the front and rear directions and avoids tangling of the air extraction nozzle 70 or the pipeline, ensuring smooth and efficient air extraction.

[0046] The drive motor 40 and the crank arm 42 can be connected by a reduction gear set.

[0047] Given that the cross-section of the suction nozzle 70 is elliptical, when the suction nozzle 70 rotates and extends into the opening of the bag body 100, the cross-sectional area of ​​the side that first contacts the bag body 100 is small, so the opening of the bag body 100 does not need to be very large to allow it to be inserted.

[0048] like Figure 7-11As shown, in this preferred embodiment, the base 10 has several through holes 1011 behind the bag opening heat-sealing assembly 12, and the flip cover 20 has several positioning holes 2011 corresponding to the through holes 1011. Positioning pins 131 are provided in the through holes 1011, and the base 10 is provided with a lifting device, which is connected to the positioning pins 131.

[0049] The positioning pin 131 has a pointed end facing the positioning hole 2011. After the flap 20 and the base 10 are fastened together to clamp the bag body 100, the positioning pin 131 extends out of the through hole 1011 and penetrates the bag body 100 into the positioning hole 2011 through the lifting device. This can open a hole in the area between the bag body 100 and the sealing strip 11 and the opening, so as to facilitate subsequent hanging and storage. It can also ensure that the bag body 100 is suspended stably during the vacuuming process in the suspension mode, and avoid tilting or falling.

[0050] like Figure 1-3 As shown, in this embodiment, the force that presses the bag body 100 is greater at the pressing sealing strip 11, while at other positions, the supporting surface 101 and the fastening surface 201 still press the bag body 100, that is, at this time, it is ensured that the positioning pin 131 can smoothly penetrate the bag body 100.

[0051] like Figure 9 As shown, taking a case where there are 6 through holes 1011, the through holes 1011 and the positioning pins 131 are symmetrically distributed on both sides of the air extraction area, with 3 through holes 1011 and positioning pins 131 distributed on each side, and the spacing between each through hole 1011 and the pressing sealing strip 11 is the same.

[0052] like Figure 2 and 5 As shown, the preferred lifting device in this embodiment includes an electromagnetic coil 132 and an iron plate 133. The electromagnetic coil 132 is fixed above the base 10, and the iron plate 133 is connected to a positioning pin 131.

[0053] When the electromagnetic coil 132 is energized, it will attract the iron piece 133 to move towards it, thereby driving the positioning pin 131 to penetrate the bag body 100 into the positioning hole 2011. When the electromagnetic coil 132 is de-energized, the positioning pin 131 will naturally retract into the through hole 1011 due to gravity. Of course, a return spring 64 can also be set between the positioning pin 131 and the seat 10 so that the positioning pin 131 can smoothly retract into the through hole 1011 after the electromagnetic coil 132 is de-energized.

[0054] like Figure 2 and 4 As shown, in this embodiment, the three positioning pins 131 on the left are grouped together, and the three positioning pins 131 on the right are grouped together, and are controlled by a combination of an electromagnetic coil 132 and an iron sheet 133 respectively.

[0055] A vacuum preservation machine also includes the following vacuuming method: S1, Laying the bag body 100: Place the open side of the bag body 100 on the support surface 101, so that the bottom of the bag body 100 covers the through hole 1011 and the lower suction cup 65; at this time, the bag body 100 attached to the support surface 101 is arc-shaped, with its left and right sides being low and its middle being high. S2, Initial fixation: Fasten the flap 20, lock the flap 20 and the base 10, so that the pressing sealing strip 11 presses and fixes the bag body 100, and at the same time the upper suction cup 66 presses the top of the bag body 100; the pressing sealing strip 11 completely presses the bag body 100 in the horizontal direction. S3, Secondary Fixing: Activate the lifting device to allow the positioning pin 131 to pass through the through hole 1011, penetrate the bag body 100 to the positioning hole 2011, and completely fix the bag body 100; When the lifting device is activated, the electromagnetic coil 132 is energized and quickly attracts the iron piece 133, so that the positioning pin 131 penetrates the bag body 100 vertically. S4, Adjust posture: Lift the handle 30 to rotate the entire refrigeration machine 90 degrees, and the bag body 100 is suspended in the air by the refrigeration machine; the bag body 100 is simultaneously fixed to the refrigeration machine by the positioning nail 131 and the pressing sealing strip 11; S5, opening the bag: Start the vacuum pump 50, and connect the main air pipe 52 to the air channel 611 through the two-position three-way valve. The upper suction cup 66 and the lower suction cup 65 generate negative pressure to adsorb the top and bottom of the bag body 100 respectively. As the negative pressure increases, the telescopic tube 63 will contract along the guide tube 62, and the lower suction cup 65 will take the bottom of the bag body 100 away from the top, so that the opening of the bag body 100 is opened. S6, Insert the suction nozzle 70: The suction nozzle 70 is rotated horizontally by the drive device, and the suction nozzle 70 is inserted into the bag body 100 through the opening of the bag body 100 until the front end of the suction nozzle 70 passes through the sealing strip 11. S7, Start pumping air: Connect the main air pipe 52 and the hose 53 through the two-position three-way valve, and the air suction nozzle 70 generates negative pressure to suck the air in the bag 100. S8, Vacuuming Completed: Select the time point to complete vacuuming based on the vacuuming status. State 1: The water immersion sensor 90 inside the suction nozzle 70 detects liquid and immediately stops suction; State 2: The pressure sensor connected to the vacuum pump 50 reaches the pressure threshold and immediately stops suction. S9, Sealing: After the air extraction is completed, the air extraction nozzle 70 is driven away from the bag body 100 and reset by the drive device, and the bag opening heat-sealing assembly 12 works to seal the bag. S10, Remove bag 100: Open the flap 20 and remove the bag 100 that has been evacuated and sealed.

[0056] like Figure 16As shown, in a new embodiment, the pressing and sealing strips 11 on the seat 10 and the flip cover 20 have two strips from front to back. The two ends of the two pressing and sealing strips 11 are connected together to form a closed shape. Figure 17 As shown, the bag opening heat-sealing assembly 12 is located between two pressing sealing strips 11 and is enclosed within them. When the flap 20 and the base 10 are closed, the pressing sealing strips 11 on the flap 20 and the base 10 are completely fitted together to form a sealing cavity 111. During vacuuming, only two movements of the vacuum nozzle 70 are required. The specific vacuuming method is as follows: S1, Laying the bag body 100: Place the open side of the bag body 100 on the support surface 101, so that the bottom of the bag body 100 covers the through hole 1011 and the lower suction cup 65; at this time, the bag body 100 attached to the support surface 101 is arc-shaped, with its left and right sides being low and its middle being high. S2, Initial fixation: Fasten the flap 20, lock the flap 20 and the base 10, so that the pressing sealing strip 11 presses and fixes the bag body 100, and at the same time the upper suction cup 66 presses the top of the bag body 100; the pressing sealing strip 11 completely presses the bag body 100 in the horizontal direction. S3, Secondary Fixing: Activate the lifting device to allow the positioning pin 131 to pass through the through hole 1011, penetrate the bag body 100 to the positioning hole 2011, and completely fix the bag body 100; When the lifting device is activated, the electromagnetic coil 132 is energized and quickly attracts the iron piece 133, so that the positioning pin 131 penetrates the bag body 100 vertically. S4, Adjust posture: Lift the handle 30 to rotate the entire refrigeration machine 90 degrees, and the bag body 100 is suspended in the air by the refrigeration machine; the bag body 100 is simultaneously fixed to the refrigeration machine by the positioning nail 131 and the pressing sealing strip 11; S5, opening the bag: Start the vacuum pump 50, and connect the main air pipe 52 to the air channel 611 through the two-position three-way valve. The upper suction cup 66 and the lower suction cup 65 generate negative pressure to adsorb the top and bottom of the bag body 100 respectively. As the negative pressure increases, the telescopic tube 63 will contract along the guide tube 62, and the lower suction cup 65 will take the bottom of the bag body 100 away from the top, so that the opening of the bag body 100 is opened. S6, Insert the suction nozzle 70: The suction nozzle 70 is rotated horizontally by the drive device, and the suction nozzle 70 is inserted into the bag body 100 through the opening of the bag body 100 until the front end of the suction nozzle 70 passes through the sealing strip 11. S7, Start pumping air: Connect the main air pipe 52 and the hose 53 through the two-position three-way valve, and the air suction nozzle 70 generates negative pressure to suck the air in the bag 100. S8, Vacuuming Completed: Select the time point to complete vacuuming based on the vacuuming status. In state one, the water immersion sensor 90 inside the suction nozzle 70 detects liquid, and the suction nozzle 70 retracts a certain distance into the sealing cavity 111, continuing to pump air until state two; in state two, the pressure sensor connected to the vacuum pump 50 reaches the pressure threshold and immediately stops pumping air. When the air extraction nozzle 70 extracts air into the sealing cavity 111, it can create a vacuum in the sealing cavity 111 area. During sealing, all the air from the sealing position to the bottom of the bag body 100 is extracted. S9, Sealing: After the air extraction is completed, the air extraction nozzle 70 is completely removed from the bag body 100 and reset by the drive device, and the bag opening heat-sealing assembly 12 works to seal the bag. S10, Remove bag 100: Open the flap 20 and remove the bag 100 that has been evacuated and sealed.

[0057] The structure and method of the present invention can more thoroughly extract air from a bag containing liquid, while preventing liquid from reaching the heat-sealing position, thus ensuring the quality of heat sealing.

[0058] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A vacuum preservation machine, comprising a base, a control circuit, and a flip cover mounted on the upper part of the base, wherein a latch is provided on each of the left and right sides of the flip cover, a bag opening heat-sealing assembly is provided at the front of the base or the flip cover, and a vacuum pump is provided on the base, characterized in that: The upper surface of the seat is the support surface, and the lower surface of the flap is the fastening surface. The support surface gradually rises from both sides to the middle. The shape of the fastening surface matches the support surface. Both the support surface and the fastening surface are provided with a pressing sealing strip. The pressing sealing strip is located in front of the bag opening heat-melt sealing assembly. The base is provided with a suction nozzle that can move back and forth. The suction nozzle is located at the highest point of the support surface. When the suction nozzle extends, it reaches the front of the sealing strip. When the suction nozzle retracts, it reaches the rear of the bag opening heat-melt sealing assembly. The base is also provided with a drive device to drive the suction nozzle to move. A liquid sensor is installed at the front of the air extraction nozzle, and the liquid sensor is electrically connected to the vacuum pump, the drive device, and the bag opening heat-sealing assembly.

2. The vacuum preservation machine according to claim 1, characterized in that: The compression sealing strip bends gradually backward from both sides toward the middle, and the bag opening heat-melt sealing assembly bends gradually backward from both sides toward the middle.

3. The vacuum preservation machine according to claim 2, characterized in that: A handle is provided on the rear side of the base and / or the flip cover. When the handle is lifted, the entire refrigeration unit rotates 90 degrees.

4. The vacuum preservation machine according to claim 2, characterized in that: A lower opening bag assembly is provided above the base body, located in the middle of the base body laterally. The lower opening bag assembly includes a lower fixed base, a lower suction cup, and a telescopic tube. A guide cylinder and an air passage are provided on the lower fixed base, which are connected to a vacuum pump. The telescopic tube is connected to the fixed base and communicates with the air passage. The lower suction cup is fixed above the telescopic tube and communicates with the telescopic tube. The telescopic tube is located inside the guide cylinder, and a spring is provided inside the guide cylinder to extend the telescopic tube. An upper opening bag assembly is provided on the flip cover, including an upper suction cup connected to a vacuum pump. The upper suction cup is positioned opposite the lower suction cup. The bottom end of the upper suction cup and the top end of the lower suction cup are higher than the top end of the suction nozzle. The upper and lower opening bag assemblies are located behind the bag opening heat-sealing assembly. When the suction nozzle retracts, it reaches behind the upper and lower suction cups.

5. The vacuum preservation machine according to claim 4, characterized in that: The base is provided with a liquid storage chamber, the bottom of which is arranged at an angle. A drain outlet is provided at the lowest point of the liquid storage chamber, and a plug is provided at the drain outlet. The vacuum pump is connected to the liquid storage chamber, and the liquid storage chamber is connected to a main air pipe. The main air pipe is connected to a hose and the air passage of the lower fixed base through a two-position three-way valve. The hose is connected to a suction nozzle, and the lower suction cup is connected to the air passage of the lower fixed base.

6. The vacuum preservation machine according to claim 5, characterized in that: The drive device includes a rotating shaft, a drive motor, and a crank arm. The air extraction nozzle is connected to the crank arm, and the rotating shaft connects the drive motor and the crank arm. The rotating shaft is arranged vertically, and the drive motor causes the crank arm and the air extraction nozzle to rotate in the horizontal plane.

7. The vacuum preservation machine according to claim 6, characterized in that: The base has several through holes behind the bag opening heat-sealing assembly, and the flip cover has several positioning holes corresponding to the through holes. Positioning pins are installed in the through holes, and a lifting device is installed on the base, which is connected to the positioning pins.

8. The vacuum preservation machine according to claim 7, characterized in that: The lifting device includes an electromagnetic coil and an iron plate. The electromagnetic coil is fixed above the base, and the iron plate is connected to a positioning pin.

9. The vacuum preservation machine according to claim 8, characterized in that: The cross-section of the suction nozzle is elliptical, the liquid sensor is a water immersion sensor, and the hardness of the two sides of the compression sealing strip is greater than that of the middle.

10. The vacuum preservation machine according to claim 9, characterized in that, It also includes the following vacuuming methods: S1, Laying the bag: Place the open side of the bag on the support surface so that the bottom of the bag covers the through hole and the lower suction cup; S2, Initial Fixing: Fasten the flap, lock the flap and the base, press the sealing strip to fix the bag body, and at the same time press the upper suction cup to press the top of the bag body; S3, Secondary Fixing: Activate the lifting device to allow the positioning pin to pass through the through hole, penetrate the bag body into the positioning hole, and completely fix the bag body. S4, Adjust posture: Lift the handle to rotate the entire refrigeration machine 90 degrees, suspending the bag in the air; S5, Open Bag: Start the vacuum pump and connect the main air pipe to the air channel through the two-position three-way valve. The upper and lower suction cups generate negative pressure to adsorb the top and bottom of the bag respectively. As the negative pressure increases, the telescopic tube will contract along the guide tube, and the lower suction cup will take the bottom of the bag away from the top, thus opening the bag. S6, Insert the suction nozzle: The suction nozzle is rotated horizontally by the drive device, and the suction nozzle is inserted into the bag body through the opening of the bag body until the front end of the suction nozzle passes through the sealing strip. S7, Start Evacuation: Connect the main air pipe to the hose through the two-position three-way valve, and the suction nozzle will generate negative pressure to draw air out of the bag. S8, Vacuuming Completed: Select the time point to complete vacuuming based on the vacuuming status. State 1: The water immersion sensor inside the vacuum nozzle detects liquid and immediately stops pumping; State 2: The pressure sensor connected to the vacuum pump reaches the pressure threshold and immediately stops pumping. S9, Sealing: After the air extraction is completed, the air extraction nozzle is driven to leave the bag body and return to its original position, and the bag opening heat-sealing assembly works to seal the bag. S10, Remove the bag: Open the flap and remove the bag that has been evacuated and sealed.

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